xref: /linux/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c (revision a0b0f6c7d7f29f1ade9ec59699d02e3b153ee8e4) !

// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  This is the driver for the ST MAC 10/100/1000 on-chip Ethernet controllers.
  ST Ethernet IPs are built around a Synopsys IP Core.

	Copyright(C) 2007-2011 STMicroelectronics Ltd


  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>

  Documentation available at:
	http://www.stlinux.com
  Support available at:
	https://bugzilla.stlinux.com/
*******************************************************************************/

#include <linux/circ_buf.h>
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>
#include <linux/prefetch.h>
#include <linux/pinctrl/consumer.h>
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#endif /* CONFIG_DEBUG_FS */
#include <linux/net_tstamp.h>
#include <linux/phylink.h>
#include <linux/udp.h>
#include <linux/bpf_trace.h>
#include <net/devlink.h>
#include <net/page_pool/helpers.h>
#include <net/pkt_cls.h>
#include <net/xdp_sock_drv.h>
#include "stmmac_ptp.h"
#include "stmmac_fpe.h"
#include "stmmac.h"
#include "stmmac_pcs.h"
#include "stmmac_xdp.h"
#include <linux/reset.h>
#include <linux/of_mdio.h>
#include "dwmac1000.h"
#include "dwxgmac2.h"
#include "hwif.h"

/* As long as the interface is active, we keep the timestamping counter enabled
 * with fine resolution and binary rollover. This avoid non-monotonic behavior
 * (clock jumps) when changing timestamping settings at runtime.
 */
#define STMMAC_HWTS_ACTIVE	(PTP_TCR_TSENA | PTP_TCR_TSCTRLSSR)

#define	STMMAC_ALIGN(x)		ALIGN(ALIGN(x, SMP_CACHE_BYTES), 16)
#define	TSO_MAX_BUFF_SIZE	(SZ_16K - 1)

/* Module parameters */
#define TX_TIMEO	5000
static int watchdog = TX_TIMEO;
module_param(watchdog, int, 0644);
MODULE_PARM_DESC(watchdog, "Transmit timeout in milliseconds (default 5s)");

static int debug = -1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Message Level (-1: default, 0: no output, 16: all)");

static int phyaddr = -1;
module_param(phyaddr, int, 0444);
MODULE_PARM_DESC(phyaddr, "Physical device address");

#define STMMAC_TX_THRESH(x)	((x)->dma_conf.dma_tx_size / 4)

/* Limit to make sure XDP TX and slow path can coexist */
#define STMMAC_XSK_TX_BUDGET_MAX	256
#define STMMAC_TX_XSK_AVAIL		16
#define STMMAC_RX_FILL_BATCH		16

#define STMMAC_XDP_PASS		0
#define STMMAC_XDP_CONSUMED	BIT(0)
#define STMMAC_XDP_TX		BIT(1)
#define STMMAC_XDP_REDIRECT	BIT(2)
#define STMMAC_XSK_CONSUMED	BIT(3)

static int flow_ctrl = 0xdead;
module_param(flow_ctrl, int, 0644);
MODULE_PARM_DESC(flow_ctrl, "Flow control ability [on/off] (obsolete)");

static int pause = PAUSE_TIME;
module_param(pause, int, 0644);
MODULE_PARM_DESC(pause, "Flow Control Pause Time (units of 512 bit times)");

#define TC_DEFAULT 64
static int tc = TC_DEFAULT;
module_param(tc, int, 0644);
MODULE_PARM_DESC(tc, "DMA threshold control value");

/* This is unused */
#define	DEFAULT_BUFSIZE	1536
static int buf_sz = DEFAULT_BUFSIZE;
module_param(buf_sz, int, 0644);
MODULE_PARM_DESC(buf_sz, "DMA buffer size");

static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
				      NETIF_MSG_LINK | NETIF_MSG_IFUP |
				      NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);

#define STMMAC_DEFAULT_LPI_TIMER	1000
static unsigned int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
module_param(eee_timer, uint, 0644);
MODULE_PARM_DESC(eee_timer, "LPI tx expiration time in msec");
#define STMMAC_LPI_T(x) (jiffies + usecs_to_jiffies(x))

/* By default the driver will use the ring mode to manage tx and rx descriptors,
 * but allow user to force to use the chain instead of the ring
 */
static unsigned int chain_mode;
module_param(chain_mode, int, 0444);
MODULE_PARM_DESC(chain_mode, "To use chain instead of ring mode");

static const char *stmmac_dwmac_actphyif[8] = {
	[PHY_INTF_SEL_GMII_MII]	= "GMII/MII",
	[PHY_INTF_SEL_RGMII]	= "RGMII",
	[PHY_INTF_SEL_SGMII]	= "SGMII",
	[PHY_INTF_SEL_TBI]	= "TBI",
	[PHY_INTF_SEL_RMII]	= "RMII",
	[PHY_INTF_SEL_RTBI]	= "RTBI",
	[PHY_INTF_SEL_SMII]	= "SMII",
	[PHY_INTF_SEL_REVMII]	= "REVMII",
};

static const char *stmmac_dwxgmac_phyif[4] = {
	[PHY_INTF_GMII]		= "GMII",
	[PHY_INTF_RGMII]	= "RGMII",
};

static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
/* For MSI interrupts handling */
static irqreturn_t stmmac_mac_interrupt(int irq, void *dev_id);
static irqreturn_t stmmac_safety_interrupt(int irq, void *dev_id);
static irqreturn_t stmmac_msi_intr_tx(int irq, void *data);
static irqreturn_t stmmac_msi_intr_rx(int irq, void *data);
static void stmmac_reset_rx_queue(struct stmmac_priv *priv, u32 queue);
static void stmmac_reset_tx_queue(struct stmmac_priv *priv, u32 queue);
static void stmmac_reset_queues_param(struct stmmac_priv *priv);
static void stmmac_tx_timer_arm(struct stmmac_priv *priv, u32 queue);
static void stmmac_flush_tx_descriptors(struct stmmac_priv *priv, int queue);
static void stmmac_set_dma_operation_mode(struct stmmac_priv *priv, u32 txmode,
					  u32 rxmode, u32 chan);
static void stmmac_vlan_restore(struct stmmac_priv *priv);

#ifdef CONFIG_DEBUG_FS
static const struct net_device_ops stmmac_netdev_ops;
static void stmmac_init_fs(struct net_device *dev);
static void stmmac_exit_fs(struct net_device *dev);
#endif

#define STMMAC_COAL_TIMER(x) (ns_to_ktime((x) * NSEC_PER_USEC))

struct stmmac_devlink_priv {
	struct stmmac_priv *stmmac_priv;
};

enum stmmac_dl_param_id {
	STMMAC_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
	STMMAC_DEVLINK_PARAM_ID_TS_COARSE,
};

/**
 * stmmac_set_clk_tx_rate() - set the clock rate for the MAC transmit clock
 * @bsp_priv: BSP private data structure (unused)
 * @clk_tx_i: the transmit clock
 * @interface: the selected interface mode
 * @speed: the speed that the MAC will be operating at
 *
 * Set the transmit clock rate for the MAC, normally 2.5MHz for 10Mbps,
 * 25MHz for 100Mbps and 125MHz for 1Gbps. This is suitable for at least
 * MII, GMII, RGMII and RMII interface modes. Platforms can hook this into
 * the plat_data->set_clk_tx_rate method directly, call it via their own
 * implementation, or implement their own method should they have more
 * complex requirements. It is intended to only be used in this method.
 *
 * plat_data->clk_tx_i must be filled in.
 */
int stmmac_set_clk_tx_rate(void *bsp_priv, struct clk *clk_tx_i,
			   phy_interface_t interface, int speed)
{
	long rate = rgmii_clock(speed);

	/* Silently ignore unsupported speeds as rgmii_clock() only
	 * supports 10, 100 and 1000Mbps. We do not want to spit
	 * errors for 2500 and higher speeds here.
	 */
	if (rate < 0)
		return 0;

	return clk_set_rate(clk_tx_i, rate);
}
EXPORT_SYMBOL_GPL(stmmac_set_clk_tx_rate);

/**
 * stmmac_axi_blen_to_mask() - convert a burst length array to reg value
 * @regval: pointer to a u32 for the resulting register value
 * @blen: pointer to an array of u32 containing the burst length values in bytes
 * @len: the number of entries in the @blen array
 */
void stmmac_axi_blen_to_mask(u32 *regval, const u32 *blen, size_t len)
{
	size_t i;
	u32 val;

	for (val = i = 0; i < len; i++) {
		u32 burst = blen[i];

		/* Burst values of zero must be skipped. */
		if (!burst)
			continue;

		/* The valid range for the burst length is 4 to 256 inclusive,
		 * and it must be a power of two.
		 */
		if (burst < 4 || burst > 256 || !is_power_of_2(burst)) {
			pr_err("stmmac: invalid burst length %u at index %zu\n",
			       burst, i);
			continue;
		}

		/* Since burst is a power of two, and the register field starts
		 * with burst = 4, shift right by two bits so bit 0 of the field
		 * corresponds with the minimum value.
		 */
		val |= burst >> 2;
	}

	*regval = FIELD_PREP(DMA_AXI_BLEN_MASK, val);
}
EXPORT_SYMBOL_GPL(stmmac_axi_blen_to_mask);

/**
 * stmmac_verify_args - verify the driver parameters.
 * Description: it checks the driver parameters and set a default in case of
 * errors.
 */
static void stmmac_verify_args(void)
{
	if (unlikely(watchdog < 0))
		watchdog = TX_TIMEO;
	if (unlikely((pause < 0) || (pause > 0xffff)))
		pause = PAUSE_TIME;

	if (flow_ctrl != 0xdead)
		pr_warn("stmmac: module parameter 'flow_ctrl' is obsolete - please remove from your module configuration\n");
}

static void __stmmac_disable_all_queues(struct stmmac_priv *priv)
{
	u8 rx_queues_cnt = priv->plat->rx_queues_to_use;
	u8 tx_queues_cnt = priv->plat->tx_queues_to_use;
	u8 maxq = max(rx_queues_cnt, tx_queues_cnt);
	u8 queue;

	for (queue = 0; queue < maxq; queue++) {
		struct stmmac_channel *ch = &priv->channel[queue];

		if (stmmac_xdp_is_enabled(priv) &&
		    test_bit(queue, priv->af_xdp_zc_qps)) {
			napi_disable(&ch->rxtx_napi);
			continue;
		}

		if (queue < rx_queues_cnt)
			napi_disable(&ch->rx_napi);
		if (queue < tx_queues_cnt)
			napi_disable(&ch->tx_napi);
	}
}

/**
 * stmmac_disable_all_queues - Disable all queues
 * @priv: driver private structure
 */
static void stmmac_disable_all_queues(struct stmmac_priv *priv)
{
	u8 rx_queues_cnt = priv->plat->rx_queues_to_use;
	struct stmmac_rx_queue *rx_q;
	u8 queue;

	/* synchronize_rcu() needed for pending XDP buffers to drain */
	for (queue = 0; queue < rx_queues_cnt; queue++) {
		rx_q = &priv->dma_conf.rx_queue[queue];
		if (rx_q->xsk_pool) {
			synchronize_rcu();
			break;
		}
	}

	__stmmac_disable_all_queues(priv);
}

/**
 * stmmac_enable_all_queues - Enable all queues
 * @priv: driver private structure
 */
static void stmmac_enable_all_queues(struct stmmac_priv *priv)
{
	u8 rx_queues_cnt = priv->plat->rx_queues_to_use;
	u8 tx_queues_cnt = priv->plat->tx_queues_to_use;
	u8 maxq = max(rx_queues_cnt, tx_queues_cnt);
	u8 queue;

	for (queue = 0; queue < maxq; queue++) {
		struct stmmac_channel *ch = &priv->channel[queue];

		if (stmmac_xdp_is_enabled(priv) &&
		    test_bit(queue, priv->af_xdp_zc_qps)) {
			napi_enable(&ch->rxtx_napi);
			continue;
		}

		if (queue < rx_queues_cnt)
			napi_enable(&ch->rx_napi);
		if (queue < tx_queues_cnt)
			napi_enable(&ch->tx_napi);
	}
}

static void stmmac_service_event_schedule(struct stmmac_priv *priv)
{
	if (!test_bit(STMMAC_DOWN, &priv->state) &&
	    !test_and_set_bit(STMMAC_SERVICE_SCHED, &priv->state))
		queue_work(priv->wq, &priv->service_task);
}

static void stmmac_global_err(struct stmmac_priv *priv)
{
	netif_carrier_off(priv->dev);
	set_bit(STMMAC_RESET_REQUESTED, &priv->state);
	stmmac_service_event_schedule(priv);
}

static void print_pkt(unsigned char *buf, int len)
{
	pr_debug("len = %d byte, buf addr: 0x%p\n", len, buf);
	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf, len);
}

static inline u32 stmmac_tx_avail(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];

	return CIRC_SPACE(tx_q->cur_tx, tx_q->dirty_tx,
			  priv->dma_conf.dma_tx_size);
}

static size_t stmmac_get_tx_desc_size(struct stmmac_priv *priv,
				      struct stmmac_tx_queue *tx_q)
{
	if (priv->extend_desc)
		return sizeof(struct dma_extended_desc);
	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
		return sizeof(struct dma_edesc);
	else
		return sizeof(struct dma_desc);
}

static struct dma_desc *stmmac_get_tx_desc(struct stmmac_priv *priv,
					   struct stmmac_tx_queue *tx_q,
					   unsigned int index)
{
	if (priv->extend_desc)
		return &tx_q->dma_etx[index].basic;
	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
		return &tx_q->dma_entx[index].basic;
	else
		return &tx_q->dma_tx[index];
}

static void stmmac_set_queue_tx_tail_ptr(struct stmmac_priv *priv,
					 struct stmmac_tx_queue *tx_q,
					 unsigned int chan, unsigned int index)
{
	size_t desc_size;
	u32 tx_tail_addr;

	desc_size = stmmac_get_tx_desc_size(priv, tx_q);

	tx_tail_addr = tx_q->dma_tx_phy + index * desc_size;
	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_tail_addr, chan);
}

static size_t stmmac_get_rx_desc_size(struct stmmac_priv *priv)
{
	if (priv->extend_desc)
		return sizeof(struct dma_extended_desc);
	else
		return sizeof(struct dma_desc);
}

static struct dma_desc *stmmac_get_rx_desc(struct stmmac_priv *priv,
					   struct stmmac_rx_queue *rx_q,
					   unsigned int index)
{
	if (priv->extend_desc)
		return &rx_q->dma_erx[index].basic;
	else
		return &rx_q->dma_rx[index];
}

static void stmmac_set_queue_rx_tail_ptr(struct stmmac_priv *priv,
					 struct stmmac_rx_queue *rx_q,
					 unsigned int chan, unsigned int index)
{
	/* This only needs to deal with normal descriptors as enhanced
	 * descriptiors are only supported with dwmac1000 (<v4.0) which
	 * does not implement .set_rx_tail_ptr
	 */
	u32 rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc);

	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_tail_addr, chan);
}

static void stmmac_set_queue_rx_buf_size(struct stmmac_priv *priv,
					 struct stmmac_rx_queue *rx_q,
					 unsigned int chan)
{
	u32 buf_size;

	if (rx_q->xsk_pool && rx_q->buf_alloc_num)
		buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
	else
		buf_size = priv->dma_conf.dma_buf_sz;

	stmmac_set_dma_bfsize(priv, priv->ioaddr, buf_size, chan);
}

/**
 * stmmac_rx_dirty - Get RX queue dirty
 * @priv: driver private structure
 * @queue: RX queue index
 */
static inline u32 stmmac_rx_dirty(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];

	return CIRC_CNT(rx_q->cur_rx, rx_q->dirty_rx,
			priv->dma_conf.dma_rx_size);
}

static bool stmmac_eee_tx_busy(struct stmmac_priv *priv)
{
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	u8 queue;

	/* check if all TX queues have the work finished */
	for (queue = 0; queue < tx_cnt; queue++) {
		struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];

		if (tx_q->dirty_tx != tx_q->cur_tx)
			return true; /* still unfinished work */
	}

	return false;
}

static void stmmac_restart_sw_lpi_timer(struct stmmac_priv *priv)
{
	mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
}

/**
 * stmmac_try_to_start_sw_lpi - check and enter in LPI mode
 * @priv: driver private structure
 * Description: this function is to verify and enter in LPI mode in case of
 * EEE.
 */
static void stmmac_try_to_start_sw_lpi(struct stmmac_priv *priv)
{
	if (stmmac_eee_tx_busy(priv)) {
		stmmac_restart_sw_lpi_timer(priv);
		return;
	}

	/* Check and enter in LPI mode */
	if (!priv->tx_path_in_lpi_mode)
		stmmac_set_lpi_mode(priv, priv->hw, STMMAC_LPI_FORCED,
				    priv->tx_lpi_clk_stop, 0);
}

/**
 * stmmac_stop_sw_lpi - stop transmitting LPI
 * @priv: driver private structure
 * Description: When using software-controlled LPI, stop transmitting LPI state.
 */
static void stmmac_stop_sw_lpi(struct stmmac_priv *priv)
{
	timer_delete_sync(&priv->eee_ctrl_timer);
	stmmac_set_lpi_mode(priv, priv->hw, STMMAC_LPI_DISABLE, false, 0);
	priv->tx_path_in_lpi_mode = false;
}

/**
 * stmmac_eee_ctrl_timer - EEE TX SW timer.
 * @t:  timer_list struct containing private info
 * Description:
 *  if there is no data transfer and if we are not in LPI state,
 *  then MAC Transmitter can be moved to LPI state.
 */
static void stmmac_eee_ctrl_timer(struct timer_list *t)
{
	struct stmmac_priv *priv = timer_container_of(priv, t, eee_ctrl_timer);

	stmmac_try_to_start_sw_lpi(priv);
}

/* stmmac_get_tx_hwtstamp - get HW TX timestamps
 * @priv: driver private structure
 * @p : descriptor pointer
 * @skb : the socket buffer
 * Description :
 * This function will read timestamp from the descriptor & pass it to stack.
 * and also perform some sanity checks.
 */
static void stmmac_get_tx_hwtstamp(struct stmmac_priv *priv,
				   struct dma_desc *p, struct sk_buff *skb)
{
	struct skb_shared_hwtstamps shhwtstamp;
	bool found = false;
	u64 ns = 0;

	if (!priv->hwts_tx_en)
		return;

	/* exit if skb doesn't support hw tstamp */
	if (likely(!skb || !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)))
		return;

	/* check tx tstamp status */
	if (stmmac_get_tx_timestamp_status(priv, p)) {
		stmmac_get_timestamp(priv, p, priv->adv_ts, &ns);
		found = true;
	} else if (!stmmac_get_mac_tx_timestamp(priv, priv->hw, &ns)) {
		found = true;
	}

	if (found) {
		ns -= priv->plat->cdc_error_adj;

		memset(&shhwtstamp, 0, sizeof(struct skb_shared_hwtstamps));
		shhwtstamp.hwtstamp = ns_to_ktime(ns);

		netdev_dbg(priv->dev, "get valid TX hw timestamp %llu\n", ns);
		/* pass tstamp to stack */
		skb_tstamp_tx(skb, &shhwtstamp);
	}
}

/* stmmac_get_rx_hwtstamp - get HW RX timestamps
 * @priv: driver private structure
 * @p : descriptor pointer
 * @np : next descriptor pointer
 * @skb : the socket buffer
 * Description :
 * This function will read received packet's timestamp from the descriptor
 * and pass it to stack. It also perform some sanity checks.
 */
static void stmmac_get_rx_hwtstamp(struct stmmac_priv *priv, struct dma_desc *p,
				   struct dma_desc *np, struct sk_buff *skb)
{
	struct skb_shared_hwtstamps *shhwtstamp = NULL;
	struct dma_desc *desc = p;
	u64 ns = 0;

	if (!priv->hwts_rx_en)
		return;
	/* For GMAC4, the valid timestamp is from CTX next desc. */
	if (dwmac_is_xmac(priv->plat->core_type))
		desc = np;

	/* Check if timestamp is available */
	if (stmmac_get_rx_timestamp_status(priv, p, np, priv->adv_ts)) {
		stmmac_get_timestamp(priv, desc, priv->adv_ts, &ns);

		ns -= priv->plat->cdc_error_adj;

		netdev_dbg(priv->dev, "get valid RX hw timestamp %llu\n", ns);
		shhwtstamp = skb_hwtstamps(skb);
		memset(shhwtstamp, 0, sizeof(struct skb_shared_hwtstamps));
		shhwtstamp->hwtstamp = ns_to_ktime(ns);
	} else  {
		netdev_dbg(priv->dev, "cannot get RX hw timestamp\n");
	}
}

static void stmmac_update_subsecond_increment(struct stmmac_priv *priv)
{
	bool xmac = dwmac_is_xmac(priv->plat->core_type);
	u32 sec_inc = 0;
	u64 temp = 0;

	stmmac_config_hw_tstamping(priv, priv->ptpaddr, priv->systime_flags);

	/* program Sub Second Increment reg */
	stmmac_config_sub_second_increment(priv, priv->ptpaddr,
					   priv->plat->clk_ptp_rate,
					   xmac, &sec_inc);
	temp = div_u64(1000000000ULL, sec_inc);

	/* Store sub second increment for later use */
	priv->sub_second_inc = sec_inc;

	/* calculate default added value:
	 * formula is :
	 * addend = (2^32)/freq_div_ratio;
	 * where, freq_div_ratio = 1e9ns/sec_inc
	 */
	temp = (u64)(temp << 32);
	priv->default_addend = div_u64(temp, priv->plat->clk_ptp_rate);
	stmmac_config_addend(priv, priv->ptpaddr, priv->default_addend);
}

/**
 *  stmmac_hwtstamp_set - control hardware timestamping.
 *  @dev: device pointer.
 *  @config: the timestamping configuration.
 *  @extack: netlink extended ack structure for error reporting.
 *  Description:
 *  This function configures the MAC to enable/disable both outgoing(TX)
 *  and incoming(RX) packets time stamping based on user input.
 *  Return Value:
 *  0 on success and an appropriate -ve integer on failure.
 */
static int stmmac_hwtstamp_set(struct net_device *dev,
			       struct kernel_hwtstamp_config *config,
			       struct netlink_ext_ack *extack)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u32 ptp_v2 = 0;
	u32 tstamp_all = 0;
	u32 ptp_over_ipv4_udp = 0;
	u32 ptp_over_ipv6_udp = 0;
	u32 ptp_over_ethernet = 0;
	u32 snap_type_sel = 0;
	u32 ts_master_en = 0;
	u32 ts_event_en = 0;

	if (!(priv->dma_cap.time_stamp || priv->adv_ts)) {
		NL_SET_ERR_MSG_MOD(extack, "No support for HW time stamping");
		priv->hwts_tx_en = 0;
		priv->hwts_rx_en = 0;

		return -EOPNOTSUPP;
	}

	if (!netif_running(dev)) {
		NL_SET_ERR_MSG_MOD(extack,
				   "Cannot change timestamping configuration while down");
		return -ENODEV;
	}

	netdev_dbg(priv->dev, "%s config flags:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
		   __func__, config->flags, config->tx_type, config->rx_filter);

	if (config->tx_type != HWTSTAMP_TX_OFF &&
	    config->tx_type != HWTSTAMP_TX_ON)
		return -ERANGE;

	if (priv->adv_ts) {
		switch (config->rx_filter) {
		case HWTSTAMP_FILTER_NONE:
			/* time stamp no incoming packet at all */
			config->rx_filter = HWTSTAMP_FILTER_NONE;
			break;

		case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
			/* PTP v1, UDP, any kind of event packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
			/* 'xmac' hardware can support Sync, Pdelay_Req and
			 * Pdelay_resp by setting bit14 and bits17/16 to 01
			 * This leaves Delay_Req timestamps out.
			 * Enable all events *and* general purpose message
			 * timestamping
			 */
			snap_type_sel = PTP_TCR_SNAPTYPSEL_1;
			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			break;

		case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
			/* PTP v1, UDP, Sync packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_SYNC;
			/* take time stamp for SYNC messages only */
			ts_event_en = PTP_TCR_TSEVNTENA;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			break;

		case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
			/* PTP v1, UDP, Delay_req packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ;
			/* take time stamp for Delay_Req messages only */
			ts_master_en = PTP_TCR_TSMSTRENA;
			ts_event_en = PTP_TCR_TSEVNTENA;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			break;

		case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
			/* PTP v2, UDP, any kind of event packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
			ptp_v2 = PTP_TCR_TSVER2ENA;
			/* take time stamp for all event messages */
			snap_type_sel = PTP_TCR_SNAPTYPSEL_1;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			break;

		case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
			/* PTP v2, UDP, Sync packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_SYNC;
			ptp_v2 = PTP_TCR_TSVER2ENA;
			/* take time stamp for SYNC messages only */
			ts_event_en = PTP_TCR_TSEVNTENA;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			break;

		case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
			/* PTP v2, UDP, Delay_req packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ;
			ptp_v2 = PTP_TCR_TSVER2ENA;
			/* take time stamp for Delay_Req messages only */
			ts_master_en = PTP_TCR_TSMSTRENA;
			ts_event_en = PTP_TCR_TSEVNTENA;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			break;

		case HWTSTAMP_FILTER_PTP_V2_EVENT:
			/* PTP v2/802.AS1 any layer, any kind of event packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
			ptp_v2 = PTP_TCR_TSVER2ENA;
			snap_type_sel = PTP_TCR_SNAPTYPSEL_1;
			if (priv->synopsys_id < DWMAC_CORE_4_10)
				ts_event_en = PTP_TCR_TSEVNTENA;
			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			ptp_over_ethernet = PTP_TCR_TSIPENA;
			break;

		case HWTSTAMP_FILTER_PTP_V2_SYNC:
			/* PTP v2/802.AS1, any layer, Sync packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V2_SYNC;
			ptp_v2 = PTP_TCR_TSVER2ENA;
			/* take time stamp for SYNC messages only */
			ts_event_en = PTP_TCR_TSEVNTENA;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			ptp_over_ethernet = PTP_TCR_TSIPENA;
			break;

		case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
			/* PTP v2/802.AS1, any layer, Delay_req packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V2_DELAY_REQ;
			ptp_v2 = PTP_TCR_TSVER2ENA;
			/* take time stamp for Delay_Req messages only */
			ts_master_en = PTP_TCR_TSMSTRENA;
			ts_event_en = PTP_TCR_TSEVNTENA;

			ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;
			ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;
			ptp_over_ethernet = PTP_TCR_TSIPENA;
			break;

		case HWTSTAMP_FILTER_NTP_ALL:
		case HWTSTAMP_FILTER_ALL:
			/* time stamp any incoming packet */
			config->rx_filter = HWTSTAMP_FILTER_ALL;
			tstamp_all = PTP_TCR_TSENALL;
			break;

		default:
			return -ERANGE;
		}
	} else {
		switch (config->rx_filter) {
		case HWTSTAMP_FILTER_NONE:
			config->rx_filter = HWTSTAMP_FILTER_NONE;
			break;
		default:
			/* PTP v1, UDP, any kind of event packet */
			config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
			break;
		}
	}
	priv->hwts_rx_en = config->rx_filter != HWTSTAMP_FILTER_NONE;
	priv->hwts_tx_en = config->tx_type == HWTSTAMP_TX_ON;

	priv->systime_flags = STMMAC_HWTS_ACTIVE;
	if (!priv->tsfupdt_coarse)
		priv->systime_flags |= PTP_TCR_TSCFUPDT;

	if (priv->hwts_tx_en || priv->hwts_rx_en) {
		priv->systime_flags |= tstamp_all | ptp_v2 |
				       ptp_over_ethernet | ptp_over_ipv6_udp |
				       ptp_over_ipv4_udp | ts_event_en |
				       ts_master_en | snap_type_sel;
	}

	stmmac_config_hw_tstamping(priv, priv->ptpaddr, priv->systime_flags);

	priv->tstamp_config = *config;

	return 0;
}

/**
 *  stmmac_hwtstamp_get - read hardware timestamping.
 *  @dev: device pointer.
 *  @config: the timestamping configuration.
 *  Description:
 *  This function obtain the current hardware timestamping settings
 *  as requested.
 */
static int stmmac_hwtstamp_get(struct net_device *dev,
			       struct kernel_hwtstamp_config *config)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp))
		return -EOPNOTSUPP;

	*config = priv->tstamp_config;

	return 0;
}

/**
 * stmmac_init_tstamp_counter - init hardware timestamping counter
 * @priv: driver private structure
 * @systime_flags: timestamping flags
 * Description:
 * Initialize hardware counter for packet timestamping.
 * This is valid as long as the interface is open and not suspended.
 * Will be rerun after resuming from suspend, case in which the timestamping
 * flags updated by stmmac_hwtstamp_set() also need to be restored.
 */
static int stmmac_init_tstamp_counter(struct stmmac_priv *priv,
				      u32 systime_flags)
{
	struct timespec64 now;

	if (!priv->plat->clk_ptp_rate) {
		netdev_err(priv->dev, "Invalid PTP clock rate");
		return -EINVAL;
	}

	stmmac_config_hw_tstamping(priv, priv->ptpaddr, systime_flags);
	priv->systime_flags = systime_flags;

	stmmac_update_subsecond_increment(priv);

	/* initialize system time */
	ktime_get_real_ts64(&now);

	/* lower 32 bits of tv_sec are safe until y2106 */
	stmmac_init_systime(priv, priv->ptpaddr, (u32)now.tv_sec, now.tv_nsec);

	return 0;
}

/**
 * stmmac_init_timestamping - initialise timestamping
 * @priv: driver private structure
 * Description: this is to verify if the HW supports the PTPv1 or PTPv2.
 * This is done by looking at the HW cap. register.
 * This function also registers the ptp driver.
 */
static int stmmac_init_timestamping(struct stmmac_priv *priv)
{
	bool xmac = dwmac_is_xmac(priv->plat->core_type);
	int ret;

	if (priv->plat->ptp_clk_freq_config)
		priv->plat->ptp_clk_freq_config(priv);

	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp)) {
		netdev_info(priv->dev, "PTP not supported by HW\n");
		return -EOPNOTSUPP;
	}

	ret = stmmac_init_tstamp_counter(priv, STMMAC_HWTS_ACTIVE |
					       PTP_TCR_TSCFUPDT);
	if (ret) {
		netdev_warn(priv->dev, "PTP init failed\n");
		return ret;
	}

	priv->adv_ts = 0;
	/* Check if adv_ts can be enabled for dwmac 4.x / xgmac core */
	if (xmac && priv->dma_cap.atime_stamp)
		priv->adv_ts = 1;
	/* Dwmac 3.x core with extend_desc can support adv_ts */
	else if (priv->extend_desc && priv->dma_cap.atime_stamp)
		priv->adv_ts = 1;

	if (priv->dma_cap.time_stamp)
		netdev_info(priv->dev, "IEEE 1588-2002 Timestamp supported\n");

	if (priv->adv_ts)
		netdev_info(priv->dev,
			    "IEEE 1588-2008 Advanced Timestamp supported\n");

	memset(&priv->tstamp_config, 0, sizeof(priv->tstamp_config));
	priv->hwts_tx_en = 0;
	priv->hwts_rx_en = 0;

	if (priv->plat->flags & STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY)
		stmmac_hwtstamp_correct_latency(priv, priv);

	return 0;
}

static void stmmac_setup_ptp(struct stmmac_priv *priv)
{
	int ret;

	ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
	if (ret < 0)
		netdev_warn(priv->dev,
			    "failed to enable PTP reference clock: %pe\n",
			    ERR_PTR(ret));

	if (stmmac_init_timestamping(priv) == 0)
		stmmac_ptp_register(priv);
}

static void stmmac_release_ptp(struct stmmac_priv *priv)
{
	stmmac_ptp_unregister(priv);
	clk_disable_unprepare(priv->plat->clk_ptp_ref);
}

static void stmmac_legacy_serdes_power_down(struct stmmac_priv *priv)
{
	if (priv->plat->serdes_powerdown && priv->legacy_serdes_is_powered)
		priv->plat->serdes_powerdown(priv->dev, priv->plat->bsp_priv);

	priv->legacy_serdes_is_powered = false;
}

static int stmmac_legacy_serdes_power_up(struct stmmac_priv *priv)
{
	int ret;

	if (!priv->plat->serdes_powerup)
		return 0;

	ret = priv->plat->serdes_powerup(priv->dev, priv->plat->bsp_priv);
	if (ret < 0)
		netdev_err(priv->dev, "SerDes powerup failed\n");
	else
		priv->legacy_serdes_is_powered = true;

	return ret;
}

/**
 *  stmmac_mac_flow_ctrl - Configure flow control in all queues
 *  @priv: driver private structure
 *  @duplex: duplex passed to the next function
 *  @flow_ctrl: desired flow control modes
 *  Description: It is used for configuring the flow control in all queues
 */
static void stmmac_mac_flow_ctrl(struct stmmac_priv *priv, u32 duplex,
				 unsigned int flow_ctrl)
{
	u8 tx_cnt = priv->plat->tx_queues_to_use;

	stmmac_flow_ctrl(priv, priv->hw, duplex, flow_ctrl, priv->pause_time,
			 tx_cnt);
}

static unsigned long stmmac_mac_get_caps(struct phylink_config *config,
					 phy_interface_t interface)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));

	/* Refresh the MAC-specific capabilities */
	stmmac_mac_update_caps(priv);

	if (priv->hw_cap_support && !priv->dma_cap.half_duplex)
		priv->hw->link.caps &= ~(MAC_1000HD | MAC_100HD | MAC_10HD);

	config->mac_capabilities = priv->hw->link.caps;

	if (priv->plat->max_speed)
		phylink_limit_mac_speed(config, priv->plat->max_speed);

	return config->mac_capabilities;
}

static struct phylink_pcs *stmmac_mac_select_pcs(struct phylink_config *config,
						 phy_interface_t interface)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
	struct phylink_pcs *pcs;

	if (priv->plat->select_pcs) {
		pcs = priv->plat->select_pcs(priv, interface);
		if (!IS_ERR(pcs))
			return pcs;
	}

	if (priv->integrated_pcs &&
	    test_bit(interface, priv->integrated_pcs->pcs.supported_interfaces))
		return &priv->integrated_pcs->pcs;

	return NULL;
}

static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,
			      const struct phylink_link_state *state)
{
	/* Nothing to do, xpcs_config() handles everything */
}

static int stmmac_mac_finish(struct phylink_config *config, unsigned int mode,
			     phy_interface_t interface)
{
	struct net_device *ndev = to_net_dev(config->dev);
	struct stmmac_priv *priv = netdev_priv(ndev);

	if (priv->plat->mac_finish)
		priv->plat->mac_finish(ndev, priv->plat->bsp_priv, mode,
				       interface);

	return 0;
}

static void stmmac_mac_link_down(struct phylink_config *config,
				 unsigned int mode, phy_interface_t interface)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));

	stmmac_mac_set(priv, priv->ioaddr, false);
	if (priv->dma_cap.eee)
		stmmac_set_eee_pls(priv, priv->hw, false);

	if (stmmac_fpe_supported(priv))
		ethtool_mmsv_link_state_handle(&priv->fpe_cfg.mmsv, false);
}

static void stmmac_mac_link_up(struct phylink_config *config,
			       struct phy_device *phy,
			       unsigned int mode, phy_interface_t interface,
			       int speed, int duplex,
			       bool tx_pause, bool rx_pause)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
	unsigned int flow_ctrl;
	u32 old_ctrl, ctrl;
	int ret;

	if (priv->plat->flags & STMMAC_FLAG_SERDES_UP_AFTER_PHY_LINKUP)
		stmmac_legacy_serdes_power_up(priv);

	old_ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
	ctrl = old_ctrl & ~priv->hw->link.speed_mask;

	if (interface == PHY_INTERFACE_MODE_USXGMII) {
		switch (speed) {
		case SPEED_10000:
			ctrl |= priv->hw->link.xgmii.speed10000;
			break;
		case SPEED_5000:
			ctrl |= priv->hw->link.xgmii.speed5000;
			break;
		case SPEED_2500:
			ctrl |= priv->hw->link.xgmii.speed2500;
			break;
		default:
			return;
		}
	} else if (interface == PHY_INTERFACE_MODE_XLGMII) {
		switch (speed) {
		case SPEED_100000:
			ctrl |= priv->hw->link.xlgmii.speed100000;
			break;
		case SPEED_50000:
			ctrl |= priv->hw->link.xlgmii.speed50000;
			break;
		case SPEED_40000:
			ctrl |= priv->hw->link.xlgmii.speed40000;
			break;
		case SPEED_25000:
			ctrl |= priv->hw->link.xlgmii.speed25000;
			break;
		case SPEED_10000:
			ctrl |= priv->hw->link.xgmii.speed10000;
			break;
		case SPEED_2500:
			ctrl |= priv->hw->link.speed2500;
			break;
		case SPEED_1000:
			ctrl |= priv->hw->link.speed1000;
			break;
		default:
			return;
		}
	} else {
		switch (speed) {
		case SPEED_2500:
			ctrl |= priv->hw->link.speed2500;
			break;
		case SPEED_1000:
			ctrl |= priv->hw->link.speed1000;
			break;
		case SPEED_100:
			ctrl |= priv->hw->link.speed100;
			break;
		case SPEED_10:
			ctrl |= priv->hw->link.speed10;
			break;
		default:
			return;
		}
	}

	if (priv->plat->fix_mac_speed)
		priv->plat->fix_mac_speed(priv->plat->bsp_priv, interface,
					  speed, mode);

	if (!duplex)
		ctrl &= ~priv->hw->link.duplex;
	else
		ctrl |= priv->hw->link.duplex;

	/* Flow Control operation */
	if (rx_pause && tx_pause)
		flow_ctrl = FLOW_AUTO;
	else if (rx_pause && !tx_pause)
		flow_ctrl = FLOW_RX;
	else if (!rx_pause && tx_pause)
		flow_ctrl = FLOW_TX;
	else
		flow_ctrl = FLOW_OFF;

	stmmac_mac_flow_ctrl(priv, duplex, flow_ctrl);

	if (ctrl != old_ctrl)
		writel(ctrl, priv->ioaddr + MAC_CTRL_REG);

	if (priv->plat->set_clk_tx_rate) {
		ret = priv->plat->set_clk_tx_rate(priv->plat->bsp_priv,
						priv->plat->clk_tx_i,
						interface, speed);
		if (ret < 0)
			netdev_err(priv->dev,
				   "failed to configure %s transmit clock for %dMbps: %pe\n",
				   phy_modes(interface), speed, ERR_PTR(ret));
	}

	stmmac_mac_set(priv, priv->ioaddr, true);
	if (priv->dma_cap.eee)
		stmmac_set_eee_pls(priv, priv->hw, true);

	if (stmmac_fpe_supported(priv))
		ethtool_mmsv_link_state_handle(&priv->fpe_cfg.mmsv, true);

	if (priv->plat->flags & STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY)
		stmmac_hwtstamp_correct_latency(priv, priv);
}

static void stmmac_mac_disable_tx_lpi(struct phylink_config *config)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));

	priv->eee_active = false;

	mutex_lock(&priv->lock);

	priv->eee_enabled = false;

	netdev_dbg(priv->dev, "disable EEE\n");
	priv->eee_sw_timer_en = false;
	timer_delete_sync(&priv->eee_ctrl_timer);
	stmmac_set_lpi_mode(priv, priv->hw, STMMAC_LPI_DISABLE, false, 0);
	priv->tx_path_in_lpi_mode = false;

	stmmac_set_eee_timer(priv, priv->hw, 0, STMMAC_DEFAULT_TWT_LS);
	mutex_unlock(&priv->lock);
}

static int stmmac_mac_enable_tx_lpi(struct phylink_config *config, u32 timer,
				    bool tx_clk_stop)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
	int ret;

	priv->tx_lpi_timer = timer;
	priv->eee_active = true;

	mutex_lock(&priv->lock);

	priv->eee_enabled = true;

	/* Update the transmit clock stop according to PHY capability if
	 * the platform allows
	 */
	if (priv->plat->flags & STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP)
		priv->tx_lpi_clk_stop = tx_clk_stop;

	stmmac_set_eee_timer(priv, priv->hw, STMMAC_DEFAULT_LIT_LS,
			     STMMAC_DEFAULT_TWT_LS);

	/* Try to configure the hardware timer. */
	ret = stmmac_set_lpi_mode(priv, priv->hw, STMMAC_LPI_TIMER,
				  priv->tx_lpi_clk_stop, priv->tx_lpi_timer);

	if (ret) {
		/* Hardware timer mode not supported, or value out of range.
		 * Fall back to using software LPI mode
		 */
		priv->eee_sw_timer_en = true;
		stmmac_restart_sw_lpi_timer(priv);
	}

	mutex_unlock(&priv->lock);
	netdev_dbg(priv->dev, "Energy-Efficient Ethernet initialized\n");

	return 0;
}

static int stmmac_mac_wol_set(struct phylink_config *config, u32 wolopts,
			      const u8 *sopass)
{
	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));

	device_set_wakeup_enable(priv->device, !!wolopts);

	mutex_lock(&priv->lock);
	priv->wolopts = wolopts;
	mutex_unlock(&priv->lock);

	return 0;
}

static const struct phylink_mac_ops stmmac_phylink_mac_ops = {
	.mac_get_caps = stmmac_mac_get_caps,
	.mac_select_pcs = stmmac_mac_select_pcs,
	.mac_config = stmmac_mac_config,
	.mac_finish = stmmac_mac_finish,
	.mac_link_down = stmmac_mac_link_down,
	.mac_link_up = stmmac_mac_link_up,
	.mac_disable_tx_lpi = stmmac_mac_disable_tx_lpi,
	.mac_enable_tx_lpi = stmmac_mac_enable_tx_lpi,
	.mac_wol_set = stmmac_mac_wol_set,
};

/**
 * stmmac_check_pcs_mode - verify if RGMII/SGMII is supported
 * @priv: driver private structure
 * Description: this is to verify if the HW supports the PCS.
 * Physical Coding Sublayer (PCS) interface that can be used when the MAC is
 * configured for the TBI, RTBI, or SGMII PHY interface.
 */
static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
{
	int interface = priv->plat->phy_interface;
	int speed = priv->plat->mac_port_sel_speed;

	if (priv->dma_cap.pcs && interface == PHY_INTERFACE_MODE_SGMII) {
		netdev_dbg(priv->dev, "PCS SGMII support enabled\n");

		switch (speed) {
		case SPEED_10:
		case SPEED_100:
		case SPEED_1000:
			priv->hw->reverse_sgmii_enable = true;
			break;

		default:
			dev_warn(priv->device, "invalid port speed\n");
			fallthrough;
		case 0:
			priv->hw->reverse_sgmii_enable = false;
			break;
		}
	}
}

/**
 * stmmac_init_phy - PHY initialization
 * @dev: net device structure
 * Description: it initializes the driver's PHY state, and attaches the PHY
 * to the mac driver.
 *  Return value:
 *  0 on success
 */
static int stmmac_init_phy(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int mode = priv->plat->phy_interface;
	struct fwnode_handle *phy_fwnode;
	struct fwnode_handle *fwnode;
	struct ethtool_keee eee;
	u32 dev_flags = 0;
	int ret;

	if (!phylink_expects_phy(priv->phylink))
		return 0;

	if (priv->hw->xpcs &&
	    xpcs_get_an_mode(priv->hw->xpcs, mode) == DW_AN_C73)
		return 0;

	fwnode = dev_fwnode(priv->device);
	if (fwnode)
		phy_fwnode = fwnode_get_phy_node(fwnode);
	else
		phy_fwnode = NULL;

	if (priv->plat->flags & STMMAC_FLAG_KEEP_PREAMBLE_BEFORE_SFD)
		dev_flags |= PHY_F_KEEP_PREAMBLE_BEFORE_SFD;

	/* Some DT bindings do not set-up the PHY handle. Let's try to
	 * manually parse it
	 */
	if (!phy_fwnode || IS_ERR(phy_fwnode)) {
		int addr = priv->plat->phy_addr;
		struct phy_device *phydev;

		if (addr < 0) {
			netdev_err(priv->dev, "no phy found\n");
			return -ENODEV;
		}

		phydev = mdiobus_get_phy(priv->mii, addr);
		if (!phydev) {
			netdev_err(priv->dev, "no phy at addr %d\n", addr);
			return -ENODEV;
		}

		phydev->dev_flags |= dev_flags;

		ret = phylink_connect_phy(priv->phylink, phydev);
	} else {
		fwnode_handle_put(phy_fwnode);
		ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, dev_flags);
	}

	if (ret) {
		netdev_err(priv->dev, "cannot attach to PHY (error: %pe)\n",
			   ERR_PTR(ret));
		return ret;
	}

	/* Configure phylib's copy of the LPI timer. Normally,
	 * phylink_config.lpi_timer_default would do this, but there is a
	 * chance that userspace could change the eee_timer setting via sysfs
	 * before the first open. Thus, preserve existing behaviour.
	 */
	if (!phylink_ethtool_get_eee(priv->phylink, &eee)) {
		eee.tx_lpi_timer = priv->tx_lpi_timer;
		phylink_ethtool_set_eee(priv->phylink, &eee);
	}

	return 0;
}

static int stmmac_phylink_setup(struct stmmac_priv *priv)
{
	struct phylink_config *config;
	struct phylink_pcs *pcs;
	struct phylink *phylink;

	config = &priv->phylink_config;

	config->dev = &priv->dev->dev;
	config->type = PHYLINK_NETDEV;
	config->mac_managed_pm = true;

	/* Stmmac always requires an RX clock for hardware initialization */
	config->mac_requires_rxc = true;

	/* Disable EEE RX clock stop to ensure VLAN register access works
	 * correctly.
	 */
	if (!(priv->plat->flags & STMMAC_FLAG_RX_CLK_RUNS_IN_LPI) &&
	    !(priv->dev->features & NETIF_F_VLAN_FEATURES))
		config->eee_rx_clk_stop_enable = true;

	/* Set the default transmit clock stop bit based on the platform glue */
	priv->tx_lpi_clk_stop = priv->plat->flags &
				STMMAC_FLAG_EN_TX_LPI_CLOCKGATING;

	config->default_an_inband = priv->plat->default_an_inband;

	/* Get the PHY interface modes (at the PHY end of the link) that
	 * are supported by the platform.
	 */
	if (priv->plat->get_interfaces)
		priv->plat->get_interfaces(priv, priv->plat->bsp_priv,
					   config->supported_interfaces);

	/* Set the platform/firmware specified interface mode if the
	 * supported interfaces have not already been provided using
	 * phy_interface as a last resort.
	 */
	if (phy_interface_empty(config->supported_interfaces))
		__set_bit(priv->plat->phy_interface,
			  config->supported_interfaces);

	/* If we have an xpcs, it defines which PHY interfaces are supported. */
	if (priv->hw->xpcs)
		pcs = xpcs_to_phylink_pcs(priv->hw->xpcs);
	else
		pcs = priv->hw->phylink_pcs;

	if (pcs)
		phy_interface_or(config->supported_interfaces,
				 config->supported_interfaces,
				 pcs->supported_interfaces);

	/* Some platforms, e.g. iMX8MP, wire lpi_intr_o to the same interrupt
	 * used for stmmac's main interrupts, which leads to interrupt storms.
	 * STMMAC_FLAG_EEE_DISABLE allows EEE to be disabled on such platforms.
	 */
	if (priv->dma_cap.eee &&
	    !(priv->plat->flags & STMMAC_FLAG_EEE_DISABLE)) {
		/* The GMAC 3.74a databook states that EEE is only supported
		 * in MII, GMII, and RGMII interfaces.
		 */
		__set_bit(PHY_INTERFACE_MODE_MII, config->lpi_interfaces);
		__set_bit(PHY_INTERFACE_MODE_GMII, config->lpi_interfaces);
		phy_interface_set_rgmii(config->lpi_interfaces);

		/* If we have a non-integrated PCS, assume that it is connected
		 * to the GMAC using GMII or another EEE compatible interface,
		 * and thus all PCS-supported interfaces support LPI.
		 */
		if (pcs)
			phy_interface_or(config->lpi_interfaces,
					 config->lpi_interfaces,
					 pcs->supported_interfaces);

		/* All full duplex speeds above 100Mbps are supported */
		config->lpi_capabilities = ~(MAC_1000FD - 1) | MAC_100FD;
		config->lpi_timer_default = eee_timer * 1000;
		config->eee_enabled_default = true;
	}

	config->wol_phy_speed_ctrl = true;
	if (priv->plat->flags & STMMAC_FLAG_USE_PHY_WOL) {
		config->wol_phy_legacy = true;
	} else {
		if (priv->dma_cap.pmt_remote_wake_up)
			config->wol_mac_support |= WAKE_UCAST;
		if (priv->dma_cap.pmt_magic_frame)
			config->wol_mac_support |= WAKE_MAGIC;
	}

	phylink = phylink_create(config, dev_fwnode(priv->device),
				 priv->plat->phy_interface,
				 &stmmac_phylink_mac_ops);
	if (IS_ERR(phylink))
		return PTR_ERR(phylink);

	priv->phylink = phylink;
	return 0;
}

static void stmmac_display_rx_rings(struct stmmac_priv *priv,
				    struct stmmac_dma_conf *dma_conf)
{
	u8 rx_cnt = priv->plat->rx_queues_to_use;
	unsigned int desc_size;
	void *head_rx;
	u8 queue;

	/* Display RX rings */
	for (queue = 0; queue < rx_cnt; queue++) {
		struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];

		pr_info("\tRX Queue %u rings\n", queue);

		head_rx = stmmac_get_rx_desc(priv, rx_q, 0);
		desc_size = stmmac_get_rx_desc_size(priv);

		/* Display RX ring */
		stmmac_display_ring(priv, head_rx, dma_conf->dma_rx_size, true,
				    rx_q->dma_rx_phy, desc_size);
	}
}

static void stmmac_display_tx_rings(struct stmmac_priv *priv,
				    struct stmmac_dma_conf *dma_conf)
{
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	unsigned int desc_size;
	void *head_tx;
	u8 queue;

	/* Display TX rings */
	for (queue = 0; queue < tx_cnt; queue++) {
		struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];

		pr_info("\tTX Queue %d rings\n", queue);

		head_tx = stmmac_get_tx_desc(priv, tx_q, 0);
		desc_size = stmmac_get_tx_desc_size(priv, tx_q);

		stmmac_display_ring(priv, head_tx, dma_conf->dma_tx_size, false,
				    tx_q->dma_tx_phy, desc_size);
	}
}

static void stmmac_display_rings(struct stmmac_priv *priv,
				 struct stmmac_dma_conf *dma_conf)
{
	/* Display RX ring */
	stmmac_display_rx_rings(priv, dma_conf);

	/* Display TX ring */
	stmmac_display_tx_rings(priv, dma_conf);
}

static unsigned int stmmac_rx_offset(struct stmmac_priv *priv)
{
	if (stmmac_xdp_is_enabled(priv))
		return XDP_PACKET_HEADROOM;

	return NET_SKB_PAD;
}

static int stmmac_set_bfsize(int mtu)
{
	int ret;

	if (mtu >= BUF_SIZE_8KiB)
		ret = BUF_SIZE_16KiB;
	else if (mtu >= BUF_SIZE_4KiB)
		ret = BUF_SIZE_8KiB;
	else if (mtu >= BUF_SIZE_2KiB)
		ret = BUF_SIZE_4KiB;
	else if (mtu > DEFAULT_BUFSIZE)
		ret = BUF_SIZE_2KiB;
	else
		ret = DEFAULT_BUFSIZE;

	return ret;
}

/**
 * stmmac_clear_rx_descriptors - clear RX descriptors
 * @priv: driver private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 * Description: this function is called to clear the RX descriptors
 * in case of both basic and extended descriptors are used.
 */
static void stmmac_clear_rx_descriptors(struct stmmac_priv *priv,
					struct stmmac_dma_conf *dma_conf,
					u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	struct dma_desc *desc;
	int i;

	/* Clear the RX descriptors */
	for (i = 0; i < dma_conf->dma_rx_size; i++) {
		desc = stmmac_get_rx_desc(priv, rx_q, i);

		stmmac_init_rx_desc(priv, desc, priv->use_riwt,
				    priv->descriptor_mode,
				    (i == dma_conf->dma_rx_size - 1),
				    dma_conf->dma_buf_sz);
	}
}

/**
 * stmmac_clear_tx_descriptors - clear tx descriptors
 * @priv: driver private structure
 * @dma_conf: structure to take the dma data
 * @queue: TX queue index.
 * Description: this function is called to clear the TX descriptors
 * in case of both basic and extended descriptors are used.
 */
static void stmmac_clear_tx_descriptors(struct stmmac_priv *priv,
					struct stmmac_dma_conf *dma_conf,
					u32 queue)
{
	struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];
	int i;

	/* Clear the TX descriptors */
	for (i = 0; i < dma_conf->dma_tx_size; i++) {
		int last = (i == (dma_conf->dma_tx_size - 1));
		struct dma_desc *p;

		p = stmmac_get_tx_desc(priv, tx_q, i);
		stmmac_init_tx_desc(priv, p, priv->descriptor_mode, last);
	}
}

/**
 * stmmac_clear_descriptors - clear descriptors
 * @priv: driver private structure
 * @dma_conf: structure to take the dma data
 * Description: this function is called to clear the TX and RX descriptors
 * in case of both basic and extended descriptors are used.
 */
static void stmmac_clear_descriptors(struct stmmac_priv *priv,
				     struct stmmac_dma_conf *dma_conf)
{
	u8 rx_queue_cnt = priv->plat->rx_queues_to_use;
	u8 tx_queue_cnt = priv->plat->tx_queues_to_use;
	u8 queue;

	/* Clear the RX descriptors */
	for (queue = 0; queue < rx_queue_cnt; queue++)
		stmmac_clear_rx_descriptors(priv, dma_conf, queue);

	/* Clear the TX descriptors */
	for (queue = 0; queue < tx_queue_cnt; queue++)
		stmmac_clear_tx_descriptors(priv, dma_conf, queue);
}

/**
 * stmmac_init_rx_buffers - init the RX descriptor buffer.
 * @priv: driver private structure
 * @dma_conf: structure to take the dma data
 * @p: descriptor pointer
 * @i: descriptor index
 * @flags: gfp flag
 * @queue: RX queue index
 * Description: this function is called to allocate a receive buffer, perform
 * the DMA mapping and init the descriptor.
 */
static int stmmac_init_rx_buffers(struct stmmac_priv *priv,
				  struct stmmac_dma_conf *dma_conf,
				  struct dma_desc *p,
				  int i, gfp_t flags, u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	struct stmmac_rx_buffer *buf = &rx_q->buf_pool[i];
	gfp_t gfp = (GFP_ATOMIC | __GFP_NOWARN);

	if (priv->dma_cap.host_dma_width <= 32)
		gfp |= GFP_DMA32;

	if (!buf->page) {
		buf->page = page_pool_alloc_pages(rx_q->page_pool, gfp);
		if (!buf->page)
			return -ENOMEM;
		buf->page_offset = stmmac_rx_offset(priv);
	}

	if (priv->sph_active && !buf->sec_page) {
		buf->sec_page = page_pool_alloc_pages(rx_q->page_pool, gfp);
		if (!buf->sec_page)
			return -ENOMEM;

		buf->sec_addr = page_pool_get_dma_addr(buf->sec_page);
		stmmac_set_desc_sec_addr(priv, p, buf->sec_addr, true);
	} else {
		buf->sec_page = NULL;
		stmmac_set_desc_sec_addr(priv, p, buf->sec_addr, false);
	}

	buf->addr = page_pool_get_dma_addr(buf->page) + buf->page_offset;

	stmmac_set_desc_addr(priv, p, buf->addr);
	if (dma_conf->dma_buf_sz == BUF_SIZE_16KiB)
		stmmac_init_desc3(priv, p);

	return 0;
}

/**
 * stmmac_free_rx_buffer - free RX dma buffers
 * @priv: private structure
 * @rx_q: RX queue
 * @i: buffer index.
 */
static void stmmac_free_rx_buffer(struct stmmac_priv *priv,
				  struct stmmac_rx_queue *rx_q,
				  int i)
{
	struct stmmac_rx_buffer *buf = &rx_q->buf_pool[i];

	if (buf->page)
		page_pool_put_full_page(rx_q->page_pool, buf->page, false);
	buf->page = NULL;

	if (buf->sec_page)
		page_pool_put_full_page(rx_q->page_pool, buf->sec_page, false);
	buf->sec_page = NULL;
}

/**
 * stmmac_free_tx_buffer - free RX dma buffers
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 * @i: buffer index.
 */
static void stmmac_free_tx_buffer(struct stmmac_priv *priv,
				  struct stmmac_dma_conf *dma_conf,
				  u32 queue, int i)
{
	struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];

	if (tx_q->tx_skbuff_dma[i].buf &&
	    tx_q->tx_skbuff_dma[i].buf_type != STMMAC_TXBUF_T_XDP_TX) {
		if (tx_q->tx_skbuff_dma[i].map_as_page)
			dma_unmap_page(priv->device,
				       tx_q->tx_skbuff_dma[i].buf,
				       tx_q->tx_skbuff_dma[i].len,
				       DMA_TO_DEVICE);
		else
			dma_unmap_single(priv->device,
					 tx_q->tx_skbuff_dma[i].buf,
					 tx_q->tx_skbuff_dma[i].len,
					 DMA_TO_DEVICE);
	}

	if (tx_q->xdpf[i] &&
	    (tx_q->tx_skbuff_dma[i].buf_type == STMMAC_TXBUF_T_XDP_TX ||
	     tx_q->tx_skbuff_dma[i].buf_type == STMMAC_TXBUF_T_XDP_NDO)) {
		xdp_return_frame(tx_q->xdpf[i]);
		tx_q->xdpf[i] = NULL;
	}

	if (tx_q->tx_skbuff_dma[i].buf_type == STMMAC_TXBUF_T_XSK_TX)
		tx_q->xsk_frames_done++;

	if (tx_q->tx_skbuff[i] &&
	    tx_q->tx_skbuff_dma[i].buf_type == STMMAC_TXBUF_T_SKB) {
		dev_kfree_skb_any(tx_q->tx_skbuff[i]);
		tx_q->tx_skbuff[i] = NULL;
	}

	tx_q->tx_skbuff_dma[i].buf = 0;
	tx_q->tx_skbuff_dma[i].map_as_page = false;
}

/**
 * dma_free_rx_skbufs - free RX dma buffers
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 */
static void dma_free_rx_skbufs(struct stmmac_priv *priv,
			       struct stmmac_dma_conf *dma_conf,
			       u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	int i;

	for (i = 0; i < dma_conf->dma_rx_size; i++)
		stmmac_free_rx_buffer(priv, rx_q, i);
}

static int stmmac_alloc_rx_buffers(struct stmmac_priv *priv,
				   struct stmmac_dma_conf *dma_conf,
				   u32 queue, gfp_t flags)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	int i;

	for (i = 0; i < dma_conf->dma_rx_size; i++) {
		struct dma_desc *p;
		int ret;

		p = stmmac_get_rx_desc(priv, rx_q, i);

		ret = stmmac_init_rx_buffers(priv, dma_conf, p, i, flags,
					     queue);
		if (ret)
			return ret;

		rx_q->buf_alloc_num++;
	}

	return 0;
}

/**
 * dma_free_rx_xskbufs - free RX dma buffers from XSK pool
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 */
static void dma_free_rx_xskbufs(struct stmmac_priv *priv,
				struct stmmac_dma_conf *dma_conf,
				u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	int i;

	for (i = 0; i < dma_conf->dma_rx_size; i++) {
		struct stmmac_rx_buffer *buf = &rx_q->buf_pool[i];

		if (!buf->xdp)
			continue;

		xsk_buff_free(buf->xdp);
		buf->xdp = NULL;
	}
}

static int stmmac_alloc_rx_buffers_zc(struct stmmac_priv *priv,
				      struct stmmac_dma_conf *dma_conf,
				      u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	int i;

	/* struct stmmac_xdp_buff is using cb field (maximum size of 24 bytes)
	 * in struct xdp_buff_xsk to stash driver specific information. Thus,
	 * use this macro to make sure no size violations.
	 */
	XSK_CHECK_PRIV_TYPE(struct stmmac_xdp_buff);

	for (i = 0; i < dma_conf->dma_rx_size; i++) {
		struct stmmac_rx_buffer *buf;
		dma_addr_t dma_addr;
		struct dma_desc *p;

		p = stmmac_get_rx_desc(priv, rx_q, i);

		buf = &rx_q->buf_pool[i];

		buf->xdp = xsk_buff_alloc(rx_q->xsk_pool);
		if (!buf->xdp)
			return -ENOMEM;

		dma_addr = xsk_buff_xdp_get_dma(buf->xdp);
		stmmac_set_desc_addr(priv, p, dma_addr);
		rx_q->buf_alloc_num++;
	}

	return 0;
}

static struct xsk_buff_pool *stmmac_get_xsk_pool(struct stmmac_priv *priv, u32 queue)
{
	if (!stmmac_xdp_is_enabled(priv) || !test_bit(queue, priv->af_xdp_zc_qps))
		return NULL;

	return xsk_get_pool_from_qid(priv->dev, queue);
}

/**
 * __init_dma_rx_desc_rings - init the RX descriptor ring (per queue)
 * @priv: driver private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 * @flags: gfp flag.
 * Description: this function initializes the DMA RX descriptors
 * and allocates the socket buffers. It supports the chained and ring
 * modes.
 */
static int __init_dma_rx_desc_rings(struct stmmac_priv *priv,
				    struct stmmac_dma_conf *dma_conf,
				    u32 queue, gfp_t flags)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	void *des;
	int ret;

	netif_dbg(priv, probe, priv->dev,
		  "(%s) dma_rx_phy=0x%08x\n", __func__,
		  (u32)rx_q->dma_rx_phy);

	stmmac_clear_rx_descriptors(priv, dma_conf, queue);

	xdp_rxq_info_unreg_mem_model(&rx_q->xdp_rxq);

	rx_q->xsk_pool = stmmac_get_xsk_pool(priv, queue);

	if (rx_q->xsk_pool) {
		WARN_ON(xdp_rxq_info_reg_mem_model(&rx_q->xdp_rxq,
						   MEM_TYPE_XSK_BUFF_POOL,
						   NULL));
		netdev_info(priv->dev,
			    "Register MEM_TYPE_XSK_BUFF_POOL RxQ-%d\n",
			    queue);
		xsk_pool_set_rxq_info(rx_q->xsk_pool, &rx_q->xdp_rxq);
	} else {
		WARN_ON(xdp_rxq_info_reg_mem_model(&rx_q->xdp_rxq,
						   MEM_TYPE_PAGE_POOL,
						   rx_q->page_pool));
		netdev_info(priv->dev,
			    "Register MEM_TYPE_PAGE_POOL RxQ-%d\n",
			    queue);
	}

	if (rx_q->xsk_pool) {
		/* RX XDP ZC buffer pool may not be populated, e.g.
		 * xdpsock TX-only.
		 */
		stmmac_alloc_rx_buffers_zc(priv, dma_conf, queue);
	} else {
		ret = stmmac_alloc_rx_buffers(priv, dma_conf, queue, flags);
		if (ret < 0)
			return -ENOMEM;
	}

	/* Setup the chained descriptor addresses */
	if (priv->descriptor_mode == STMMAC_CHAIN_MODE) {
		if (priv->extend_desc)
			des = rx_q->dma_erx;
		else
			des = rx_q->dma_rx;

		stmmac_mode_init(priv, des, rx_q->dma_rx_phy,
				 dma_conf->dma_rx_size, priv->extend_desc);
	}

	return 0;
}

static int init_dma_rx_desc_rings(struct net_device *dev,
				  struct stmmac_dma_conf *dma_conf,
				  gfp_t flags)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 rx_count = priv->plat->rx_queues_to_use;
	int queue;
	int ret;

	/* RX INITIALIZATION */
	netif_dbg(priv, probe, priv->dev,
		  "SKB addresses:\nskb\t\tskb data\tdma data\n");

	for (queue = 0; queue < rx_count; queue++) {
		ret = __init_dma_rx_desc_rings(priv, dma_conf, queue, flags);
		if (ret)
			goto err_init_rx_buffers;
	}

	return 0;

err_init_rx_buffers:
	while (queue >= 0) {
		struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];

		if (rx_q->xsk_pool)
			dma_free_rx_xskbufs(priv, dma_conf, queue);
		else
			dma_free_rx_skbufs(priv, dma_conf, queue);

		rx_q->buf_alloc_num = 0;
		rx_q->xsk_pool = NULL;

		queue--;
	}

	return ret;
}

static void stmmac_set_tx_dma_entry(struct stmmac_tx_queue *tx_q,
				    unsigned int entry,
				    enum stmmac_txbuf_type type,
				    dma_addr_t addr, size_t len,
				    bool map_as_page)
{
	tx_q->tx_skbuff_dma[entry].buf = addr;
	tx_q->tx_skbuff_dma[entry].len = len;
	tx_q->tx_skbuff_dma[entry].buf_type = type;
	tx_q->tx_skbuff_dma[entry].map_as_page = map_as_page;
	tx_q->tx_skbuff_dma[entry].last_segment = false;
	tx_q->tx_skbuff_dma[entry].is_jumbo = false;
}

static void stmmac_set_tx_skb_dma_entry(struct stmmac_tx_queue *tx_q,
					unsigned int entry, dma_addr_t addr,
					size_t len, bool map_as_page)
{
	stmmac_set_tx_dma_entry(tx_q, entry, STMMAC_TXBUF_T_SKB, addr, len,
				map_as_page);
}

static void stmmac_set_tx_dma_last_segment(struct stmmac_tx_queue *tx_q,
					   unsigned int entry)
{
	tx_q->tx_skbuff_dma[entry].last_segment = true;
}

/**
 * __init_dma_tx_desc_rings - init the TX descriptor ring (per queue)
 * @priv: driver private structure
 * @dma_conf: structure to take the dma data
 * @queue: TX queue index
 * Description: this function initializes the DMA TX descriptors
 * and allocates the socket buffers. It supports the chained and ring
 * modes.
 */
static int __init_dma_tx_desc_rings(struct stmmac_priv *priv,
				    struct stmmac_dma_conf *dma_conf,
				    u32 queue)
{
	struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];
	int i;

	netif_dbg(priv, probe, priv->dev,
		  "(%s) dma_tx_phy=0x%08x\n", __func__,
		  (u32)tx_q->dma_tx_phy);

	/* Setup the chained descriptor addresses */
	if (priv->descriptor_mode == STMMAC_CHAIN_MODE) {
		if (priv->extend_desc)
			stmmac_mode_init(priv, tx_q->dma_etx,
					 tx_q->dma_tx_phy,
					 dma_conf->dma_tx_size, 1);
		else if (!(tx_q->tbs & STMMAC_TBS_AVAIL))
			stmmac_mode_init(priv, tx_q->dma_tx,
					 tx_q->dma_tx_phy,
					 dma_conf->dma_tx_size, 0);
	}

	tx_q->xsk_pool = stmmac_get_xsk_pool(priv, queue);

	for (i = 0; i < dma_conf->dma_tx_size; i++) {
		struct dma_desc *p;

		p = stmmac_get_tx_desc(priv, tx_q, i);
		stmmac_clear_desc(priv, p);
		stmmac_set_tx_skb_dma_entry(tx_q, i, 0, 0, false);

		tx_q->tx_skbuff[i] = NULL;
	}

	return 0;
}

static int init_dma_tx_desc_rings(struct net_device *dev,
				  struct stmmac_dma_conf *dma_conf)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 tx_queue_cnt;
	u8 queue;

	tx_queue_cnt = priv->plat->tx_queues_to_use;

	for (queue = 0; queue < tx_queue_cnt; queue++)
		__init_dma_tx_desc_rings(priv, dma_conf, queue);

	return 0;
}

/**
 * init_dma_desc_rings - init the RX/TX descriptor rings
 * @dev: net device structure
 * @dma_conf: structure to take the dma data
 * @flags: gfp flag.
 * Description: this function initializes the DMA RX/TX descriptors
 * and allocates the socket buffers. It supports the chained and ring
 * modes.
 */
static int init_dma_desc_rings(struct net_device *dev,
			       struct stmmac_dma_conf *dma_conf,
			       gfp_t flags)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int ret;

	ret = init_dma_rx_desc_rings(dev, dma_conf, flags);
	if (ret)
		return ret;

	ret = init_dma_tx_desc_rings(dev, dma_conf);

	stmmac_clear_descriptors(priv, dma_conf);

	if (netif_msg_hw(priv))
		stmmac_display_rings(priv, dma_conf);

	return ret;
}

/**
 * dma_free_tx_skbufs - free TX dma buffers
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: TX queue index
 */
static void dma_free_tx_skbufs(struct stmmac_priv *priv,
			       struct stmmac_dma_conf *dma_conf,
			       u32 queue)
{
	struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];
	int i;

	tx_q->xsk_frames_done = 0;

	for (i = 0; i < dma_conf->dma_tx_size; i++)
		stmmac_free_tx_buffer(priv, dma_conf, queue, i);

	if (tx_q->xsk_pool && tx_q->xsk_frames_done) {
		xsk_tx_completed(tx_q->xsk_pool, tx_q->xsk_frames_done);
		tx_q->xsk_frames_done = 0;
		tx_q->xsk_pool = NULL;
	}
}

/**
 * stmmac_free_tx_skbufs - free TX skb buffers
 * @priv: private structure
 */
static void stmmac_free_tx_skbufs(struct stmmac_priv *priv)
{
	u8 tx_queue_cnt = priv->plat->tx_queues_to_use;
	u8 queue;

	for (queue = 0; queue < tx_queue_cnt; queue++)
		dma_free_tx_skbufs(priv, &priv->dma_conf, queue);
}

/**
 * __free_dma_rx_desc_resources - free RX dma desc resources (per queue)
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 */
static void __free_dma_rx_desc_resources(struct stmmac_priv *priv,
					 struct stmmac_dma_conf *dma_conf,
					 u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	size_t size;
	void *addr;

	/* Release the DMA RX socket buffers */
	if (rx_q->xsk_pool)
		dma_free_rx_xskbufs(priv, dma_conf, queue);
	else
		dma_free_rx_skbufs(priv, dma_conf, queue);

	rx_q->buf_alloc_num = 0;
	rx_q->xsk_pool = NULL;

	/* Free DMA regions of consistent memory previously allocated */
	if (priv->extend_desc)
		addr = rx_q->dma_erx;
	else
		addr = rx_q->dma_rx;

	size = stmmac_get_rx_desc_size(priv) * dma_conf->dma_rx_size;

	dma_free_coherent(priv->device, size, addr, rx_q->dma_rx_phy);

	if (xdp_rxq_info_is_reg(&rx_q->xdp_rxq))
		xdp_rxq_info_unreg(&rx_q->xdp_rxq);

	kfree(rx_q->buf_pool);
	if (rx_q->page_pool)
		page_pool_destroy(rx_q->page_pool);
}

static void free_dma_rx_desc_resources(struct stmmac_priv *priv,
				       struct stmmac_dma_conf *dma_conf)
{
	u8 rx_count = priv->plat->rx_queues_to_use;
	u8 queue;

	/* Free RX queue resources */
	for (queue = 0; queue < rx_count; queue++)
		__free_dma_rx_desc_resources(priv, dma_conf, queue);
}

/**
 * __free_dma_tx_desc_resources - free TX dma desc resources (per queue)
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: TX queue index
 */
static void __free_dma_tx_desc_resources(struct stmmac_priv *priv,
					 struct stmmac_dma_conf *dma_conf,
					 u32 queue)
{
	struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];
	size_t size;
	void *addr;

	/* Release the DMA TX socket buffers */
	dma_free_tx_skbufs(priv, dma_conf, queue);

	if (priv->extend_desc) {
		addr = tx_q->dma_etx;
	} else if (tx_q->tbs & STMMAC_TBS_AVAIL) {
		addr = tx_q->dma_entx;
	} else {
		addr = tx_q->dma_tx;
	}

	size = stmmac_get_tx_desc_size(priv, tx_q) * dma_conf->dma_tx_size;

	dma_free_coherent(priv->device, size, addr, tx_q->dma_tx_phy);

	kfree(tx_q->tx_skbuff_dma);
	kfree(tx_q->tx_skbuff);
}

static void free_dma_tx_desc_resources(struct stmmac_priv *priv,
				       struct stmmac_dma_conf *dma_conf)
{
	u8 tx_count = priv->plat->tx_queues_to_use;
	u8 queue;

	/* Free TX queue resources */
	for (queue = 0; queue < tx_count; queue++)
		__free_dma_tx_desc_resources(priv, dma_conf, queue);
}

/**
 * __alloc_dma_rx_desc_resources - alloc RX resources (per queue).
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: RX queue index
 * Description: according to which descriptor can be used (extend or basic)
 * this function allocates the resources for TX and RX paths. In case of
 * reception, for example, it pre-allocated the RX socket buffer in order to
 * allow zero-copy mechanism.
 */
static int __alloc_dma_rx_desc_resources(struct stmmac_priv *priv,
					 struct stmmac_dma_conf *dma_conf,
					 u32 queue)
{
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
	struct stmmac_channel *ch = &priv->channel[queue];
	bool xdp_prog = stmmac_xdp_is_enabled(priv);
	struct page_pool_params pp_params = { 0 };
	unsigned int dma_buf_sz_pad, num_pages;
	unsigned int napi_id;
	size_t size;
	void *addr;
	int ret;

	dma_buf_sz_pad = stmmac_rx_offset(priv) + dma_conf->dma_buf_sz +
			 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
	num_pages = DIV_ROUND_UP(dma_buf_sz_pad, PAGE_SIZE);

	rx_q->queue_index = queue;
	rx_q->priv_data = priv;
	rx_q->napi_skb_frag_size = num_pages * PAGE_SIZE;

	pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV;
	pp_params.pool_size = dma_conf->dma_rx_size;
	pp_params.order = order_base_2(num_pages);
	pp_params.nid = dev_to_node(priv->device);
	pp_params.dev = priv->device;
	pp_params.dma_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
	pp_params.offset = stmmac_rx_offset(priv);
	pp_params.max_len = dma_conf->dma_buf_sz;

	if (priv->sph_active) {
		pp_params.offset = 0;
		pp_params.max_len += stmmac_rx_offset(priv);
	}

	rx_q->page_pool = page_pool_create(&pp_params);
	if (IS_ERR(rx_q->page_pool)) {
		ret = PTR_ERR(rx_q->page_pool);
		rx_q->page_pool = NULL;
		return ret;
	}

	rx_q->buf_pool = kzalloc_objs(*rx_q->buf_pool, dma_conf->dma_rx_size);
	if (!rx_q->buf_pool)
		return -ENOMEM;

	size = stmmac_get_rx_desc_size(priv) * dma_conf->dma_rx_size;

	addr = dma_alloc_coherent(priv->device, size, &rx_q->dma_rx_phy,
				  GFP_KERNEL);
	if (!addr)
		return -ENOMEM;

	if (priv->extend_desc)
		rx_q->dma_erx = addr;
	else
		rx_q->dma_rx = addr;

	if (stmmac_xdp_is_enabled(priv) &&
	    test_bit(queue, priv->af_xdp_zc_qps))
		napi_id = ch->rxtx_napi.napi_id;
	else
		napi_id = ch->rx_napi.napi_id;

	ret = xdp_rxq_info_reg(&rx_q->xdp_rxq, priv->dev, queue, napi_id);
	if (ret) {
		netdev_err(priv->dev, "Failed to register xdp rxq info\n");
		return -EINVAL;
	}

	return 0;
}

static int alloc_dma_rx_desc_resources(struct stmmac_priv *priv,
				       struct stmmac_dma_conf *dma_conf)
{
	u8 rx_count = priv->plat->rx_queues_to_use;
	u8 queue;
	int ret;

	/* RX queues buffers and DMA */
	for (queue = 0; queue < rx_count; queue++) {
		ret = __alloc_dma_rx_desc_resources(priv, dma_conf, queue);
		if (ret)
			goto err_dma;
	}

	return 0;

err_dma:
	free_dma_rx_desc_resources(priv, dma_conf);

	return ret;
}

/**
 * __alloc_dma_tx_desc_resources - alloc TX resources (per queue).
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * @queue: TX queue index
 * Description: according to which descriptor can be used (extend or basic)
 * this function allocates the resources for TX and RX paths. In case of
 * reception, for example, it pre-allocated the RX socket buffer in order to
 * allow zero-copy mechanism.
 */
static int __alloc_dma_tx_desc_resources(struct stmmac_priv *priv,
					 struct stmmac_dma_conf *dma_conf,
					 u32 queue)
{
	struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[queue];
	size_t size;
	void *addr;

	tx_q->queue_index = queue;
	tx_q->priv_data = priv;

	tx_q->tx_skbuff_dma = kzalloc_objs(*tx_q->tx_skbuff_dma,
					   dma_conf->dma_tx_size);
	if (!tx_q->tx_skbuff_dma)
		return -ENOMEM;

	tx_q->tx_skbuff = kzalloc_objs(struct sk_buff *, dma_conf->dma_tx_size);
	if (!tx_q->tx_skbuff)
		return -ENOMEM;

	size = stmmac_get_tx_desc_size(priv, tx_q) * dma_conf->dma_tx_size;

	addr = dma_alloc_coherent(priv->device, size,
				  &tx_q->dma_tx_phy, GFP_KERNEL);
	if (!addr)
		return -ENOMEM;

	if (priv->extend_desc)
		tx_q->dma_etx = addr;
	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
		tx_q->dma_entx = addr;
	else
		tx_q->dma_tx = addr;

	return 0;
}

static int alloc_dma_tx_desc_resources(struct stmmac_priv *priv,
				       struct stmmac_dma_conf *dma_conf)
{
	u8 tx_count = priv->plat->tx_queues_to_use;
	u8 queue;
	int ret;

	/* TX queues buffers and DMA */
	for (queue = 0; queue < tx_count; queue++) {
		ret = __alloc_dma_tx_desc_resources(priv, dma_conf, queue);
		if (ret)
			goto err_dma;
	}

	return 0;

err_dma:
	free_dma_tx_desc_resources(priv, dma_conf);
	return ret;
}

/**
 * alloc_dma_desc_resources - alloc TX/RX resources.
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 * Description: according to which descriptor can be used (extend or basic)
 * this function allocates the resources for TX and RX paths. In case of
 * reception, for example, it pre-allocated the RX socket buffer in order to
 * allow zero-copy mechanism.
 */
static int alloc_dma_desc_resources(struct stmmac_priv *priv,
				    struct stmmac_dma_conf *dma_conf)
{
	/* RX Allocation */
	int ret = alloc_dma_rx_desc_resources(priv, dma_conf);

	if (ret)
		return ret;

	ret = alloc_dma_tx_desc_resources(priv, dma_conf);

	return ret;
}

/**
 * free_dma_desc_resources - free dma desc resources
 * @priv: private structure
 * @dma_conf: structure to take the dma data
 */
static void free_dma_desc_resources(struct stmmac_priv *priv,
				    struct stmmac_dma_conf *dma_conf)
{
	/* Release the DMA TX socket buffers */
	free_dma_tx_desc_resources(priv, dma_conf);

	/* Release the DMA RX socket buffers later
	 * to ensure all pending XDP_TX buffers are returned.
	 */
	free_dma_rx_desc_resources(priv, dma_conf);
}

/**
 *  stmmac_mac_enable_rx_queues - Enable MAC rx queues
 *  @priv: driver private structure
 *  Description: It is used for enabling the rx queues in the MAC
 */
static void stmmac_mac_enable_rx_queues(struct stmmac_priv *priv)
{
	u8 rx_queues_count = priv->plat->rx_queues_to_use;
	u8 queue;
	u8 mode;

	for (queue = 0; queue < rx_queues_count; queue++) {
		mode = priv->plat->rx_queues_cfg[queue].mode_to_use;
		stmmac_rx_queue_enable(priv, priv->hw, mode, queue);
	}
}

/**
 * stmmac_start_rx_dma - start RX DMA channel
 * @priv: driver private structure
 * @chan: RX channel index
 * Description:
 * This starts a RX DMA channel
 */
static void stmmac_start_rx_dma(struct stmmac_priv *priv, u32 chan)
{
	netdev_dbg(priv->dev, "DMA RX processes started in channel %d\n", chan);
	stmmac_start_rx(priv, priv->ioaddr, chan);
}

/**
 * stmmac_start_tx_dma - start TX DMA channel
 * @priv: driver private structure
 * @chan: TX channel index
 * Description:
 * This starts a TX DMA channel
 */
static void stmmac_start_tx_dma(struct stmmac_priv *priv, u32 chan)
{
	netdev_dbg(priv->dev, "DMA TX processes started in channel %d\n", chan);
	stmmac_start_tx(priv, priv->ioaddr, chan);
}

/**
 * stmmac_stop_rx_dma - stop RX DMA channel
 * @priv: driver private structure
 * @chan: RX channel index
 * Description:
 * This stops a RX DMA channel
 */
static void stmmac_stop_rx_dma(struct stmmac_priv *priv, u32 chan)
{
	netdev_dbg(priv->dev, "DMA RX processes stopped in channel %d\n", chan);
	stmmac_stop_rx(priv, priv->ioaddr, chan);
}

/**
 * stmmac_stop_tx_dma - stop TX DMA channel
 * @priv: driver private structure
 * @chan: TX channel index
 * Description:
 * This stops a TX DMA channel
 */
static void stmmac_stop_tx_dma(struct stmmac_priv *priv, u32 chan)
{
	netdev_dbg(priv->dev, "DMA TX processes stopped in channel %d\n", chan);
	stmmac_stop_tx(priv, priv->ioaddr, chan);
}

static void stmmac_enable_all_dma_irq(struct stmmac_priv *priv)
{
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	u8 dma_csr_ch = max(rx_channels_count, tx_channels_count);
	u8 chan;

	for (chan = 0; chan < dma_csr_ch; chan++) {
		struct stmmac_channel *ch = &priv->channel[chan];
		unsigned long flags;

		spin_lock_irqsave(&ch->lock, flags);
		stmmac_enable_dma_irq(priv, priv->ioaddr, chan, 1, 1);
		spin_unlock_irqrestore(&ch->lock, flags);
	}
}

/**
 * stmmac_start_all_dma - start all RX and TX DMA channels
 * @priv: driver private structure
 * Description:
 * This starts all the RX and TX DMA channels
 */
static void stmmac_start_all_dma(struct stmmac_priv *priv)
{
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	u8 chan;

	for (chan = 0; chan < rx_channels_count; chan++)
		stmmac_start_rx_dma(priv, chan);

	for (chan = 0; chan < tx_channels_count; chan++)
		stmmac_start_tx_dma(priv, chan);
}

/**
 * stmmac_stop_all_dma - stop all RX and TX DMA channels
 * @priv: driver private structure
 * Description:
 * This stops the RX and TX DMA channels
 */
static void stmmac_stop_all_dma(struct stmmac_priv *priv)
{
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	u8 chan;

	for (chan = 0; chan < rx_channels_count; chan++)
		stmmac_stop_rx_dma(priv, chan);

	for (chan = 0; chan < tx_channels_count; chan++)
		stmmac_stop_tx_dma(priv, chan);
}

/**
 *  stmmac_dma_operation_mode - HW DMA operation mode
 *  @priv: driver private structure
 *  Description: it is used for configuring the DMA operation mode register in
 *  order to program the tx/rx DMA thresholds or Store-And-Forward mode.
 */
static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
{
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	int rxfifosz = priv->plat->rx_fifo_size;
	int txfifosz = priv->plat->tx_fifo_size;
	u32 txmode = 0;
	u32 rxmode = 0;
	u8 qmode = 0;
	u8 chan;

	if (rxfifosz == 0)
		rxfifosz = priv->dma_cap.rx_fifo_size;
	if (txfifosz == 0)
		txfifosz = priv->dma_cap.tx_fifo_size;

	/* Split up the shared Tx/Rx FIFO memory on DW QoS Eth and DW XGMAC */
	if (dwmac_is_xmac(priv->plat->core_type)) {
		rxfifosz /= rx_channels_count;
		txfifosz /= tx_channels_count;
	}

	if (priv->plat->force_thresh_dma_mode) {
		txmode = tc;
		rxmode = tc;
	} else if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
		/*
		 * In case of GMAC, SF mode can be enabled
		 * to perform the TX COE in HW. This depends on:
		 * 1) TX COE if actually supported
		 * 2) There is no bugged Jumbo frame support
		 *    that needs to not insert csum in the TDES.
		 */
		txmode = SF_DMA_MODE;
		rxmode = SF_DMA_MODE;
		priv->xstats.threshold = SF_DMA_MODE;
	} else {
		txmode = tc;
		rxmode = SF_DMA_MODE;
	}

	/* configure all channels */
	for (chan = 0; chan < rx_channels_count; chan++) {
		struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[chan];

		qmode = priv->plat->rx_queues_cfg[chan].mode_to_use;

		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
				rxfifosz, qmode);

		stmmac_set_queue_rx_buf_size(priv, rx_q, chan);
	}

	for (chan = 0; chan < tx_channels_count; chan++) {
		qmode = priv->plat->tx_queues_cfg[chan].mode_to_use;

		stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan,
				txfifosz, qmode);
	}
}

static void stmmac_xsk_request_timestamp(void *_priv)
{
	struct stmmac_metadata_request *meta_req = _priv;

	stmmac_enable_tx_timestamp(meta_req->priv, meta_req->tx_desc);
	*meta_req->set_ic = true;
}

static u64 stmmac_xsk_fill_timestamp(void *_priv)
{
	struct stmmac_xsk_tx_complete *tx_compl = _priv;
	struct stmmac_priv *priv = tx_compl->priv;
	struct dma_desc *desc = tx_compl->desc;
	bool found = false;
	u64 ns = 0;

	if (!priv->hwts_tx_en)
		return 0;

	/* check tx tstamp status */
	if (stmmac_get_tx_timestamp_status(priv, desc)) {
		stmmac_get_timestamp(priv, desc, priv->adv_ts, &ns);
		found = true;
	} else if (!stmmac_get_mac_tx_timestamp(priv, priv->hw, &ns)) {
		found = true;
	}

	if (found) {
		ns -= priv->plat->cdc_error_adj;
		return ns_to_ktime(ns);
	}

	return 0;
}

static void stmmac_xsk_request_launch_time(u64 launch_time, void *_priv)
{
	struct timespec64 ts = ns_to_timespec64(launch_time);
	struct stmmac_metadata_request *meta_req = _priv;

	if (meta_req->tbs & STMMAC_TBS_EN)
		stmmac_set_desc_tbs(meta_req->priv, meta_req->edesc, ts.tv_sec,
				    ts.tv_nsec);
}

static const struct xsk_tx_metadata_ops stmmac_xsk_tx_metadata_ops = {
	.tmo_request_timestamp		= stmmac_xsk_request_timestamp,
	.tmo_fill_timestamp		= stmmac_xsk_fill_timestamp,
	.tmo_request_launch_time	= stmmac_xsk_request_launch_time,
};

static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
{
	struct netdev_queue *nq = netdev_get_tx_queue(priv->dev, queue);
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
	struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[queue];
	bool csum = !priv->plat->tx_queues_cfg[queue].coe_unsupported;
	struct xsk_buff_pool *pool = tx_q->xsk_pool;
	unsigned int entry = tx_q->cur_tx;
	struct dma_desc *tx_desc = NULL;
	struct xdp_desc xdp_desc;
	bool work_done = true;
	u32 tx_set_ic_bit = 0;

	/* Avoids TX time-out as we are sharing with slow path */
	txq_trans_cond_update(nq);

	budget = min(budget, stmmac_tx_avail(priv, queue));

	for (; budget > 0; budget--) {
		struct stmmac_metadata_request meta_req;
		struct xsk_tx_metadata *meta = NULL;
		dma_addr_t dma_addr;
		bool set_ic;

		/* We are sharing with slow path and stop XSK TX desc submission when
		 * available TX ring is less than threshold.
		 */
		if (unlikely(stmmac_tx_avail(priv, queue) < STMMAC_TX_XSK_AVAIL) ||
		    !netif_carrier_ok(priv->dev)) {
			work_done = false;
			break;
		}

		if (!xsk_tx_peek_desc(pool, &xdp_desc))
			break;

		if (priv->est && priv->est->enable &&
		    priv->est->max_sdu[queue] &&
		    xdp_desc.len > priv->est->max_sdu[queue]) {
			priv->xstats.max_sdu_txq_drop[queue]++;
			continue;
		}

		tx_desc = stmmac_get_tx_desc(priv, tx_q, entry);
		dma_addr = xsk_buff_raw_get_dma(pool, xdp_desc.addr);
		meta = xsk_buff_get_metadata(pool, xdp_desc.addr);
		xsk_buff_raw_dma_sync_for_device(pool, dma_addr, xdp_desc.len);

		/* To return XDP buffer to XSK pool, we simple call
		 * xsk_tx_completed(), so we don't need to fill up
		 * 'buf' and 'xdpf'.
		 */
		stmmac_set_tx_dma_entry(tx_q, entry, STMMAC_TXBUF_T_XSK_TX,
					0, xdp_desc.len, false);
		stmmac_set_tx_dma_last_segment(tx_q, entry);

		tx_q->xdpf[entry] = NULL;

		stmmac_set_desc_addr(priv, tx_desc, dma_addr);

		tx_q->tx_count_frames++;

		if (!priv->tx_coal_frames[queue])
			set_ic = false;
		else if (tx_q->tx_count_frames % priv->tx_coal_frames[queue] == 0)
			set_ic = true;
		else
			set_ic = false;

		meta_req.priv = priv;
		meta_req.tx_desc = tx_desc;
		meta_req.set_ic = &set_ic;
		meta_req.tbs = tx_q->tbs;
		meta_req.edesc = &tx_q->dma_entx[entry];
		xsk_tx_metadata_request(meta, &stmmac_xsk_tx_metadata_ops,
					&meta_req);
		if (set_ic) {
			tx_q->tx_count_frames = 0;
			stmmac_set_tx_ic(priv, tx_desc);
			tx_set_ic_bit++;
		}

		stmmac_prepare_tx_desc(priv, tx_desc, 1, xdp_desc.len,
				       csum, priv->descriptor_mode, true, true,
				       xdp_desc.len);

		stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);

		xsk_tx_metadata_to_compl(meta,
					 &tx_q->tx_skbuff_dma[entry].xsk_meta);

		tx_q->cur_tx = STMMAC_NEXT_ENTRY(tx_q->cur_tx, priv->dma_conf.dma_tx_size);
		entry = tx_q->cur_tx;
	}
	u64_stats_update_begin(&txq_stats->napi_syncp);
	u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
	u64_stats_update_end(&txq_stats->napi_syncp);

	if (tx_desc) {
		stmmac_flush_tx_descriptors(priv, queue);
		xsk_tx_release(pool);
	}

	/* Return true if all of the 3 conditions are met
	 *  a) TX Budget is still available
	 *  b) work_done = true when XSK TX desc peek is empty (no more
	 *     pending XSK TX for transmission)
	 */
	return !!budget && work_done;
}

static void stmmac_bump_dma_threshold(struct stmmac_priv *priv, u32 chan)
{
	if (unlikely(priv->xstats.threshold != SF_DMA_MODE) && tc <= 256) {
		tc += 64;

		if (priv->plat->force_thresh_dma_mode)
			stmmac_set_dma_operation_mode(priv, tc, tc, chan);
		else
			stmmac_set_dma_operation_mode(priv, tc, SF_DMA_MODE,
						      chan);

		priv->xstats.threshold = tc;
	}
}

/**
 * stmmac_tx_clean - to manage the transmission completion
 * @priv: driver private structure
 * @budget: napi budget limiting this functions packet handling
 * @queue: TX queue index
 * @pending_packets: signal to arm the TX coal timer
 * Description: it reclaims the transmit resources after transmission completes.
 * If some packets still needs to be handled, due to TX coalesce, set
 * pending_packets to true to make NAPI arm the TX coal timer.
 */
static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue,
			   bool *pending_packets)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
	struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[queue];
	unsigned int bytes_compl = 0, pkts_compl = 0;
	unsigned int entry, xmits = 0, count = 0;
	u32 tx_packets = 0, tx_errors = 0;

	__netif_tx_lock_bh(netdev_get_tx_queue(priv->dev, queue));

	tx_q->xsk_frames_done = 0;

	entry = tx_q->dirty_tx;

	/* Try to clean all TX complete frame in 1 shot */
	while ((entry != tx_q->cur_tx) && count < priv->dma_conf.dma_tx_size) {
		struct xdp_frame *xdpf;
		struct sk_buff *skb;
		struct dma_desc *p;
		int status;

		if (tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_XDP_TX ||
		    tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_XDP_NDO) {
			xdpf = tx_q->xdpf[entry];
			skb = NULL;
		} else if (tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_SKB) {
			xdpf = NULL;
			skb = tx_q->tx_skbuff[entry];
		} else {
			xdpf = NULL;
			skb = NULL;
		}

		p = stmmac_get_tx_desc(priv, tx_q, entry);
		status = stmmac_tx_status(priv,	&priv->xstats, p, priv->ioaddr);
		/* Check if the descriptor is owned by the DMA */
		if (unlikely(status & tx_dma_own))
			break;

		count++;

		/* Make sure descriptor fields are read after reading
		 * the own bit.
		 */
		dma_rmb();

		/* Just consider the last segment and ...*/
		if (likely(!(status & tx_not_ls))) {
			/* ... verify the status error condition */
			if (unlikely(status & tx_err)) {
				tx_errors++;
				if (unlikely(status & tx_err_bump_tc))
					stmmac_bump_dma_threshold(priv, queue);
			} else {
				tx_packets++;
			}
			if (skb) {
				stmmac_get_tx_hwtstamp(priv, p, skb);
			} else if (tx_q->xsk_pool &&
				   xp_tx_metadata_enabled(tx_q->xsk_pool)) {
				struct stmmac_xsk_tx_complete tx_compl = {
					.priv = priv,
					.desc = p,
				};

				xsk_tx_metadata_complete(&tx_q->tx_skbuff_dma[entry].xsk_meta,
							 &stmmac_xsk_tx_metadata_ops,
							 &tx_compl);
			}
		}

		if (likely(tx_q->tx_skbuff_dma[entry].buf &&
			   tx_q->tx_skbuff_dma[entry].buf_type != STMMAC_TXBUF_T_XDP_TX)) {
			if (tx_q->tx_skbuff_dma[entry].map_as_page)
				dma_unmap_page(priv->device,
					       tx_q->tx_skbuff_dma[entry].buf,
					       tx_q->tx_skbuff_dma[entry].len,
					       DMA_TO_DEVICE);
			else
				dma_unmap_single(priv->device,
						 tx_q->tx_skbuff_dma[entry].buf,
						 tx_q->tx_skbuff_dma[entry].len,
						 DMA_TO_DEVICE);
			tx_q->tx_skbuff_dma[entry].buf = 0;
			tx_q->tx_skbuff_dma[entry].len = 0;
			tx_q->tx_skbuff_dma[entry].map_as_page = false;
		}

		/* This looks at tx_q->tx_skbuff_dma[tx_q->dirty_tx].is_jumbo
		 * and tx_q->tx_skbuff_dma[tx_q->dirty_tx].last_segment
		 */
		stmmac_clean_desc3(priv, tx_q, p);

		tx_q->tx_skbuff_dma[entry].last_segment = false;
		tx_q->tx_skbuff_dma[entry].is_jumbo = false;

		if (xdpf &&
		    tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_XDP_TX) {
			xdp_return_frame_rx_napi(xdpf);
			tx_q->xdpf[entry] = NULL;
		}

		if (xdpf &&
		    tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_XDP_NDO) {
			xdp_return_frame(xdpf);
			tx_q->xdpf[entry] = NULL;
		}

		if (tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_XSK_TX)
			tx_q->xsk_frames_done++;

		if (tx_q->tx_skbuff_dma[entry].buf_type == STMMAC_TXBUF_T_SKB) {
			if (likely(skb)) {
				pkts_compl++;
				bytes_compl += skb->len;
				dev_consume_skb_any(skb);
				tx_q->tx_skbuff[entry] = NULL;
			}
		}

		stmmac_release_tx_desc(priv, p, priv->descriptor_mode);

		entry = STMMAC_NEXT_ENTRY(entry, priv->dma_conf.dma_tx_size);
	}
	tx_q->dirty_tx = entry;

	netdev_tx_completed_queue(netdev_get_tx_queue(priv->dev, queue),
				  pkts_compl, bytes_compl);

	if (unlikely(netif_tx_queue_stopped(netdev_get_tx_queue(priv->dev,
								queue))) &&
	    stmmac_tx_avail(priv, queue) > STMMAC_TX_THRESH(priv)) {

		netif_dbg(priv, tx_done, priv->dev,
			  "%s: restart transmit\n", __func__);
		netif_tx_wake_queue(netdev_get_tx_queue(priv->dev, queue));
	}

	if (tx_q->xsk_pool) {
		bool work_done;

		if (tx_q->xsk_frames_done)
			xsk_tx_completed(tx_q->xsk_pool, tx_q->xsk_frames_done);

		if (xsk_uses_need_wakeup(tx_q->xsk_pool))
			xsk_set_tx_need_wakeup(tx_q->xsk_pool);

		/* For XSK TX, we try to send as many as possible.
		 * If XSK work done (XSK TX desc empty and budget still
		 * available), return "budget - 1" to reenable TX IRQ.
		 * Else, return "budget" to make NAPI continue polling.
		 */
		work_done = stmmac_xdp_xmit_zc(priv, queue,
					       STMMAC_XSK_TX_BUDGET_MAX);
		if (work_done)
			xmits = budget - 1;
		else
			xmits = budget;
	}

	if (priv->eee_sw_timer_en && !priv->tx_path_in_lpi_mode)
		stmmac_restart_sw_lpi_timer(priv);

	/* We still have pending packets, let's call for a new scheduling */
	if (tx_q->dirty_tx != tx_q->cur_tx)
		*pending_packets = true;

	u64_stats_update_begin(&txq_stats->napi_syncp);
	u64_stats_add(&txq_stats->napi.tx_packets, tx_packets);
	u64_stats_add(&txq_stats->napi.tx_pkt_n, tx_packets);
	u64_stats_inc(&txq_stats->napi.tx_clean);
	u64_stats_update_end(&txq_stats->napi_syncp);

	priv->xstats.tx_errors += tx_errors;

	__netif_tx_unlock_bh(netdev_get_tx_queue(priv->dev, queue));

	/* Combine decisions from TX clean and XSK TX */
	return max(count, xmits);
}

/**
 * stmmac_tx_err - to manage the tx error
 * @priv: driver private structure
 * @chan: channel index
 * Description: it cleans the descriptors and restarts the transmission
 * in case of transmission errors.
 */
static void stmmac_tx_err(struct stmmac_priv *priv, u32 chan)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[chan];

	netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, chan));

	stmmac_stop_tx_dma(priv, chan);
	dma_free_tx_skbufs(priv, &priv->dma_conf, chan);
	stmmac_clear_tx_descriptors(priv, &priv->dma_conf, chan);
	stmmac_reset_tx_queue(priv, chan);
	stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
			    tx_q->dma_tx_phy, chan);
	stmmac_start_tx_dma(priv, chan);

	priv->xstats.tx_errors++;
	netif_tx_wake_queue(netdev_get_tx_queue(priv->dev, chan));
}

/**
 *  stmmac_set_dma_operation_mode - Set DMA operation mode by channel
 *  @priv: driver private structure
 *  @txmode: TX operating mode
 *  @rxmode: RX operating mode
 *  @chan: channel index
 *  Description: it is used for configuring of the DMA operation mode in
 *  runtime in order to program the tx/rx DMA thresholds or Store-And-Forward
 *  mode.
 */
static void stmmac_set_dma_operation_mode(struct stmmac_priv *priv, u32 txmode,
					  u32 rxmode, u32 chan)
{
	u8 rxqmode = priv->plat->rx_queues_cfg[chan].mode_to_use;
	u8 txqmode = priv->plat->tx_queues_cfg[chan].mode_to_use;
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	int rxfifosz = priv->plat->rx_fifo_size;
	int txfifosz = priv->plat->tx_fifo_size;

	if (rxfifosz == 0)
		rxfifosz = priv->dma_cap.rx_fifo_size;
	if (txfifosz == 0)
		txfifosz = priv->dma_cap.tx_fifo_size;

	/* Adjust for real per queue fifo size */
	rxfifosz /= rx_channels_count;
	txfifosz /= tx_channels_count;

	stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan, rxfifosz, rxqmode);
	stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan, txfifosz, txqmode);
}

static bool stmmac_safety_feat_interrupt(struct stmmac_priv *priv)
{
	int ret;

	ret = stmmac_safety_feat_irq_status(priv, priv->dev,
			priv->ioaddr, priv->dma_cap.asp, &priv->sstats);
	if (ret && (ret != -EINVAL)) {
		stmmac_global_err(priv);
		return true;
	}

	return false;
}

static int stmmac_napi_check(struct stmmac_priv *priv, u32 chan, u32 dir)
{
	int status = stmmac_dma_interrupt_status(priv, priv->ioaddr,
						 &priv->xstats, chan, dir);
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[chan];
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[chan];
	struct stmmac_channel *ch = &priv->channel[chan];
	struct napi_struct *rx_napi;
	struct napi_struct *tx_napi;
	unsigned long flags;

	rx_napi = rx_q->xsk_pool ? &ch->rxtx_napi : &ch->rx_napi;
	tx_napi = tx_q->xsk_pool ? &ch->rxtx_napi : &ch->tx_napi;

	if ((status & handle_rx) && (chan < priv->plat->rx_queues_to_use)) {
		if (napi_schedule_prep(rx_napi)) {
			spin_lock_irqsave(&ch->lock, flags);
			stmmac_disable_dma_irq(priv, priv->ioaddr, chan, 1, 0);
			spin_unlock_irqrestore(&ch->lock, flags);
			__napi_schedule(rx_napi);
		}
	}

	if ((status & handle_tx) && (chan < priv->plat->tx_queues_to_use)) {
		if (napi_schedule_prep(tx_napi)) {
			spin_lock_irqsave(&ch->lock, flags);
			stmmac_disable_dma_irq(priv, priv->ioaddr, chan, 0, 1);
			spin_unlock_irqrestore(&ch->lock, flags);
			__napi_schedule(tx_napi);
		}
	}

	return status;
}

/**
 * stmmac_dma_interrupt - DMA ISR
 * @priv: driver private structure
 * Description: this is the DMA ISR. It is called by the main ISR.
 * It calls the dwmac dma routine and schedule poll method in case of some
 * work can be done.
 */
static void stmmac_dma_interrupt(struct stmmac_priv *priv)
{
	u8 tx_channel_count = priv->plat->tx_queues_to_use;
	u8 rx_channel_count = priv->plat->rx_queues_to_use;
	u8 channels_to_check = tx_channel_count > rx_channel_count ?
			       tx_channel_count : rx_channel_count;
	int status[MAX_T(u32, MTL_MAX_TX_QUEUES, MTL_MAX_RX_QUEUES)];
	u8 chan;

	/* Make sure we never check beyond our status buffer. */
	if (WARN_ON_ONCE(channels_to_check > ARRAY_SIZE(status)))
		channels_to_check = ARRAY_SIZE(status);

	for (chan = 0; chan < channels_to_check; chan++)
		status[chan] = stmmac_napi_check(priv, chan,
						 DMA_DIR_RXTX);

	for (chan = 0; chan < tx_channel_count; chan++) {
		if (unlikely(status[chan] & tx_hard_error_bump_tc)) {
			/* Try to bump up the dma threshold on this failure */
			stmmac_bump_dma_threshold(priv, chan);
		} else if (unlikely(status[chan] == tx_hard_error)) {
			stmmac_tx_err(priv, chan);
		}
	}
}

/**
 * stmmac_mmc_setup: setup the Mac Management Counters (MMC)
 * @priv: driver private structure
 * Description: this masks the MMC irq, in fact, the counters are managed in SW.
 */
static void stmmac_mmc_setup(struct stmmac_priv *priv)
{
	unsigned int mode = MMC_CNTRL_RESET_ON_READ | MMC_CNTRL_COUNTER_RESET |
			    MMC_CNTRL_PRESET | MMC_CNTRL_FULL_HALF_PRESET;

	stmmac_mmc_intr_all_mask(priv, priv->mmcaddr);

	if (priv->dma_cap.rmon) {
		stmmac_mmc_ctrl(priv, priv->mmcaddr, mode);
		memset(&priv->mmc, 0, sizeof(struct stmmac_counters));
	} else
		netdev_info(priv->dev, "No MAC Management Counters available\n");
}

/**
 * stmmac_get_hw_features - get MAC capabilities from the HW cap. register.
 * @priv: driver private structure
 * Description:
 *  new GMAC chip generations have a new register to indicate the
 *  presence of the optional feature/functions.
 *  This can be also used to override the value passed through the
 *  platform and necessary for old MAC10/100 and GMAC chips.
 */
static int stmmac_get_hw_features(struct stmmac_priv *priv)
{
	return stmmac_get_hw_feature(priv, priv->ioaddr, &priv->dma_cap) == 0;
}

/**
 * stmmac_check_ether_addr - check if the MAC addr is valid
 * @priv: driver private structure
 * Description:
 * it is to verify if the MAC address is valid, in case of failures it
 * generates a random MAC address
 */
static void stmmac_check_ether_addr(struct stmmac_priv *priv)
{
	u8 addr[ETH_ALEN];

	if (!is_valid_ether_addr(priv->dev->dev_addr)) {
		stmmac_get_umac_addr(priv, priv->hw, addr, 0);
		if (is_valid_ether_addr(addr))
			eth_hw_addr_set(priv->dev, addr);
		else
			eth_hw_addr_random(priv->dev);
		dev_info(priv->device, "device MAC address %pM\n",
			 priv->dev->dev_addr);
	}
}

int stmmac_get_phy_intf_sel(phy_interface_t interface)
{
	int phy_intf_sel = -EINVAL;

	if (interface == PHY_INTERFACE_MODE_MII ||
	    interface == PHY_INTERFACE_MODE_GMII)
		phy_intf_sel = PHY_INTF_SEL_GMII_MII;
	else if (phy_interface_mode_is_rgmii(interface))
		phy_intf_sel = PHY_INTF_SEL_RGMII;
	else if (interface == PHY_INTERFACE_MODE_RMII)
		phy_intf_sel = PHY_INTF_SEL_RMII;
	else if (interface == PHY_INTERFACE_MODE_REVMII)
		phy_intf_sel = PHY_INTF_SEL_REVMII;

	return phy_intf_sel;
}
EXPORT_SYMBOL_GPL(stmmac_get_phy_intf_sel);

static int stmmac_prereset_configure(struct stmmac_priv *priv)
{
	struct plat_stmmacenet_data *plat_dat = priv->plat;
	phy_interface_t interface;
	struct phylink_pcs *pcs;
	int phy_intf_sel, ret;

	if (!plat_dat->set_phy_intf_sel)
		return 0;

	interface = plat_dat->phy_interface;

	/* Check whether this mode uses a PCS */
	pcs = stmmac_mac_select_pcs(&priv->phylink_config, interface);
	if (priv->integrated_pcs && pcs == &priv->integrated_pcs->pcs) {
		/* Request the phy_intf_sel from the integrated PCS */
		phy_intf_sel = stmmac_integrated_pcs_get_phy_intf_sel(pcs,
								    interface);
	} else {
		phy_intf_sel = stmmac_get_phy_intf_sel(interface);
	}

	if (phy_intf_sel < 0) {
		netdev_err(priv->dev,
			   "failed to get phy_intf_sel for %s: %pe\n",
			   phy_modes(interface), ERR_PTR(phy_intf_sel));
		return phy_intf_sel;
	}

	ret = plat_dat->set_phy_intf_sel(plat_dat->bsp_priv, phy_intf_sel);
	if (ret == -EINVAL)
		netdev_err(priv->dev, "platform does not support %s\n",
			   phy_modes(interface));
	else if (ret < 0)
		netdev_err(priv->dev,
			   "platform failed to set interface %s: %pe\n",
			   phy_modes(interface), ERR_PTR(ret));

	return ret;
}

/**
 * stmmac_init_dma_engine - DMA init.
 * @priv: driver private structure
 * Description:
 * It inits the DMA invoking the specific MAC/GMAC callback.
 * Some DMA parameters can be passed from the platform;
 * in case of these are not passed a default is kept for the MAC or GMAC.
 */
static int stmmac_init_dma_engine(struct stmmac_priv *priv)
{
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	u8 dma_csr_ch = max(rx_channels_count, tx_channels_count);
	struct stmmac_rx_queue *rx_q;
	struct stmmac_tx_queue *tx_q;
	int ret = 0;
	u8 chan;

	ret = stmmac_prereset_configure(priv);
	if (ret)
		return ret;

	ret = stmmac_reset(priv);
	if (ret) {
		netdev_err(priv->dev, "Failed to reset the dma\n");
		return ret;
	}

	/* DMA Configuration */
	stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg);

	if (priv->plat->axi)
		stmmac_axi(priv, priv->ioaddr, priv->plat->axi);

	/* DMA CSR Channel configuration */
	for (chan = 0; chan < dma_csr_ch; chan++) {
		stmmac_init_chan(priv, priv->ioaddr, priv->plat->dma_cfg, chan);
		stmmac_disable_dma_irq(priv, priv->ioaddr, chan, 1, 1);
	}

	/* DMA RX Channel Configuration */
	for (chan = 0; chan < rx_channels_count; chan++) {
		rx_q = &priv->dma_conf.rx_queue[chan];

		stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
				    rx_q->dma_rx_phy, chan);

		stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan,
					     rx_q->buf_alloc_num);
	}

	/* DMA TX Channel Configuration */
	for (chan = 0; chan < tx_channels_count; chan++) {
		tx_q = &priv->dma_conf.tx_queue[chan];

		stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
				    tx_q->dma_tx_phy, chan);

		stmmac_set_queue_tx_tail_ptr(priv, tx_q, chan, 0);
	}

	return ret;
}

static void stmmac_tx_timer_arm(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
	u32 tx_coal_timer = priv->tx_coal_timer[queue];
	struct stmmac_channel *ch;
	struct napi_struct *napi;

	if (!tx_coal_timer)
		return;

	ch = &priv->channel[queue];
	napi = tx_q->xsk_pool ? &ch->rxtx_napi : &ch->tx_napi;

	/* Arm timer only if napi is not already scheduled.
	 * Try to cancel any timer if napi is scheduled, timer will be armed
	 * again in the next scheduled napi.
	 */
	if (unlikely(!napi_is_scheduled(napi)))
		hrtimer_start(&tx_q->txtimer,
			      STMMAC_COAL_TIMER(tx_coal_timer),
			      HRTIMER_MODE_REL);
	else
		hrtimer_try_to_cancel(&tx_q->txtimer);
}

/**
 * stmmac_tx_timer - mitigation sw timer for tx.
 * @t: data pointer
 * Description:
 * This is the timer handler to directly invoke the stmmac_tx_clean.
 */
static enum hrtimer_restart stmmac_tx_timer(struct hrtimer *t)
{
	struct stmmac_tx_queue *tx_q = container_of(t, struct stmmac_tx_queue, txtimer);
	struct stmmac_priv *priv = tx_q->priv_data;
	struct stmmac_channel *ch;
	struct napi_struct *napi;

	ch = &priv->channel[tx_q->queue_index];
	napi = tx_q->xsk_pool ? &ch->rxtx_napi : &ch->tx_napi;

	if (likely(napi_schedule_prep(napi))) {
		unsigned long flags;

		spin_lock_irqsave(&ch->lock, flags);
		stmmac_disable_dma_irq(priv, priv->ioaddr, ch->index, 0, 1);
		spin_unlock_irqrestore(&ch->lock, flags);
		__napi_schedule(napi);
	}

	return HRTIMER_NORESTART;
}

/**
 * stmmac_init_coalesce - init mitigation options.
 * @priv: driver private structure
 * Description:
 * This inits the coalesce parameters: i.e. timer rate,
 * timer handler and default threshold used for enabling the
 * interrupt on completion bit.
 */
static void stmmac_init_coalesce(struct stmmac_priv *priv)
{
	u8 tx_channel_count = priv->plat->tx_queues_to_use;
	u8 rx_channel_count = priv->plat->rx_queues_to_use;
	u8 chan;

	for (chan = 0; chan < tx_channel_count; chan++) {
		struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[chan];

		priv->tx_coal_frames[chan] = STMMAC_TX_FRAMES;
		priv->tx_coal_timer[chan] = STMMAC_COAL_TX_TIMER;

		hrtimer_setup(&tx_q->txtimer, stmmac_tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	}

	for (chan = 0; chan < rx_channel_count; chan++)
		priv->rx_coal_frames[chan] = STMMAC_RX_FRAMES;
}

static void stmmac_set_rings_length(struct stmmac_priv *priv)
{
	u8 rx_channels_count = priv->plat->rx_queues_to_use;
	u8 tx_channels_count = priv->plat->tx_queues_to_use;
	u8 chan;

	/* set TX ring length */
	for (chan = 0; chan < tx_channels_count; chan++)
		stmmac_set_tx_ring_len(priv, priv->ioaddr,
				       (priv->dma_conf.dma_tx_size - 1), chan);

	/* set RX ring length */
	for (chan = 0; chan < rx_channels_count; chan++)
		stmmac_set_rx_ring_len(priv, priv->ioaddr,
				       (priv->dma_conf.dma_rx_size - 1), chan);
}

/**
 *  stmmac_set_tx_queue_weight - Set TX queue weight
 *  @priv: driver private structure
 *  Description: It is used for setting TX queues weight
 */
static void stmmac_set_tx_queue_weight(struct stmmac_priv *priv)
{
	u8 tx_queues_count = priv->plat->tx_queues_to_use;
	u32 weight;
	u8 queue;

	for (queue = 0; queue < tx_queues_count; queue++) {
		weight = priv->plat->tx_queues_cfg[queue].weight;
		stmmac_set_mtl_tx_queue_weight(priv, priv->hw, weight, queue);
	}
}

/**
 *  stmmac_configure_cbs - Configure CBS in TX queue
 *  @priv: driver private structure
 *  Description: It is used for configuring CBS in AVB TX queues
 */
static void stmmac_configure_cbs(struct stmmac_priv *priv)
{
	u8 tx_queues_count = priv->plat->tx_queues_to_use;
	u32 mode_to_use;
	u8 queue;

	/* queue 0 is reserved for legacy traffic */
	for (queue = 1; queue < tx_queues_count; queue++) {
		mode_to_use = priv->plat->tx_queues_cfg[queue].mode_to_use;
		if (mode_to_use == MTL_QUEUE_DCB)
			continue;

		stmmac_config_cbs(priv, priv->hw,
				priv->plat->tx_queues_cfg[queue].send_slope,
				priv->plat->tx_queues_cfg[queue].idle_slope,
				priv->plat->tx_queues_cfg[queue].high_credit,
				priv->plat->tx_queues_cfg[queue].low_credit,
				queue);
	}
}

/**
 *  stmmac_rx_queue_dma_chan_map - Map RX queue to RX dma channel
 *  @priv: driver private structure
 *  Description: It is used for mapping RX queues to RX dma channels
 */
static void stmmac_rx_queue_dma_chan_map(struct stmmac_priv *priv)
{
	u8 rx_queues_count = priv->plat->rx_queues_to_use;
	u8 queue;
	u32 chan;

	for (queue = 0; queue < rx_queues_count; queue++) {
		chan = priv->plat->rx_queues_cfg[queue].chan;
		stmmac_map_mtl_to_dma(priv, priv->hw, queue, chan);
	}
}

/**
 *  stmmac_mac_config_rx_queues_prio - Configure RX Queue priority
 *  @priv: driver private structure
 *  Description: It is used for configuring the RX Queue Priority
 */
static void stmmac_mac_config_rx_queues_prio(struct stmmac_priv *priv)
{
	u8 rx_queues_count = priv->plat->rx_queues_to_use;
	u8 queue;
	u32 prio;

	for (queue = 0; queue < rx_queues_count; queue++) {
		if (!priv->plat->rx_queues_cfg[queue].use_prio)
			continue;

		prio = priv->plat->rx_queues_cfg[queue].prio;
		stmmac_rx_queue_prio(priv, priv->hw, prio, queue);
	}
}

/**
 *  stmmac_mac_config_tx_queues_prio - Configure TX Queue priority
 *  @priv: driver private structure
 *  Description: It is used for configuring the TX Queue Priority
 */
static void stmmac_mac_config_tx_queues_prio(struct stmmac_priv *priv)
{
	u8 tx_queues_count = priv->plat->tx_queues_to_use;
	u8 queue;
	u32 prio;

	for (queue = 0; queue < tx_queues_count; queue++) {
		if (!priv->plat->tx_queues_cfg[queue].use_prio)
			continue;

		prio = priv->plat->tx_queues_cfg[queue].prio;
		stmmac_tx_queue_prio(priv, priv->hw, prio, queue);
	}
}

/**
 *  stmmac_mac_config_rx_queues_routing - Configure RX Queue Routing
 *  @priv: driver private structure
 *  Description: It is used for configuring the RX queue routing
 */
static void stmmac_mac_config_rx_queues_routing(struct stmmac_priv *priv)
{
	u8 rx_queues_count = priv->plat->rx_queues_to_use;
	u8 packet;
	u8 queue;

	for (queue = 0; queue < rx_queues_count; queue++) {
		/* no specific packet type routing specified for the queue */
		if (priv->plat->rx_queues_cfg[queue].pkt_route == 0x0)
			continue;

		packet = priv->plat->rx_queues_cfg[queue].pkt_route;
		stmmac_rx_queue_routing(priv, priv->hw, packet, queue);
	}
}

static void stmmac_mac_config_rss(struct stmmac_priv *priv)
{
	if (!priv->dma_cap.rssen || !priv->plat->rss_en) {
		priv->rss.enable = false;
		return;
	}

	if (priv->dev->features & NETIF_F_RXHASH)
		priv->rss.enable = true;
	else
		priv->rss.enable = false;

	stmmac_rss_configure(priv, priv->hw, &priv->rss,
			     priv->plat->rx_queues_to_use);
}

/**
 *  stmmac_mtl_configuration - Configure MTL
 *  @priv: driver private structure
 *  Description: It is used for configuring MTL
 */
static void stmmac_mtl_configuration(struct stmmac_priv *priv)
{
	u8 rx_queues_count = priv->plat->rx_queues_to_use;
	u8 tx_queues_count = priv->plat->tx_queues_to_use;

	if (tx_queues_count > 1)
		stmmac_set_tx_queue_weight(priv);

	/* Configure MTL RX algorithms */
	if (rx_queues_count > 1)
		stmmac_prog_mtl_rx_algorithms(priv, priv->hw,
				priv->plat->rx_sched_algorithm);

	/* Configure MTL TX algorithms */
	if (tx_queues_count > 1)
		stmmac_prog_mtl_tx_algorithms(priv, priv->hw,
				priv->plat->tx_sched_algorithm);

	/* Configure CBS in AVB TX queues */
	if (tx_queues_count > 1)
		stmmac_configure_cbs(priv);

	/* Map RX MTL to DMA channels */
	stmmac_rx_queue_dma_chan_map(priv);

	/* Enable MAC RX Queues */
	stmmac_mac_enable_rx_queues(priv);

	/* Set RX priorities */
	if (rx_queues_count > 1)
		stmmac_mac_config_rx_queues_prio(priv);

	/* Set TX priorities */
	if (tx_queues_count > 1)
		stmmac_mac_config_tx_queues_prio(priv);

	/* Set RX routing */
	if (rx_queues_count > 1)
		stmmac_mac_config_rx_queues_routing(priv);

	/* Receive Side Scaling */
	if (rx_queues_count > 1)
		stmmac_mac_config_rss(priv);
}

static void stmmac_safety_feat_configuration(struct stmmac_priv *priv)
{
	if (priv->dma_cap.asp) {
		netdev_info(priv->dev, "Enabling Safety Features\n");
		stmmac_safety_feat_config(priv, priv->ioaddr, priv->dma_cap.asp,
					  priv->plat->safety_feat_cfg);
	} else {
		netdev_info(priv->dev, "No Safety Features support found\n");
	}
}

/* STM32MP25xx (dwmac v5.3) states "Do not enable time-based scheduling for
 * channels on which the TSO feature is enabled." If we have a skb for a
 * channel which has TBS enabled, fall back to software GSO.
 */
static bool stmmac_tso_channel_permitted(struct stmmac_priv *priv,
					 unsigned int chan)
{
	/* TSO and TBS cannot co-exist */
	return !(priv->dma_conf.tx_queue[chan].tbs & STMMAC_TBS_AVAIL);
}

/**
 * stmmac_hw_setup - setup mac in a usable state.
 *  @dev : pointer to the device structure.
 *  Description:
 *  this is the main function to setup the HW in a usable state because the
 *  dma engine is reset, the core registers are configured (e.g. AXI,
 *  Checksum features, timers). The DMA is ready to start receiving and
 *  transmitting.
 *  Return value:
 *  0 on success and an appropriate (-)ve integer as defined in errno.h
 *  file on failure.
 */
static int stmmac_hw_setup(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 rx_cnt = priv->plat->rx_queues_to_use;
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	bool sph_en;
	u8 chan;
	int ret;

	/* Make sure RX clock is enabled */
	if (priv->hw->phylink_pcs)
		phylink_pcs_pre_init(priv->phylink, priv->hw->phylink_pcs);

	/* Note that clk_rx_i must be running for reset to complete. This
	 * clock may also be required when setting the MAC address.
	 *
	 * Block the receive clock stop for LPI mode at the PHY in case
	 * the link is established with EEE mode active.
	 */
	phylink_rx_clk_stop_block(priv->phylink);

	/* DMA initialization and SW reset */
	ret = stmmac_init_dma_engine(priv);
	if (ret < 0) {
		phylink_rx_clk_stop_unblock(priv->phylink);
		netdev_err(priv->dev, "%s: DMA engine initialization failed\n",
			   __func__);
		return ret;
	}

	/* Copy the MAC addr into the HW  */
	stmmac_set_umac_addr(priv, priv->hw, dev->dev_addr, 0);
	phylink_rx_clk_stop_unblock(priv->phylink);

	/* Initialize the MAC Core */
	stmmac_core_init(priv, priv->hw, dev);

	/* Initialize MTL*/
	stmmac_mtl_configuration(priv);

	/* Initialize Safety Features */
	stmmac_safety_feat_configuration(priv);

	ret = stmmac_rx_ipc(priv, priv->hw);
	if (!ret) {
		netdev_warn(priv->dev, "RX IPC Checksum Offload disabled\n");
		priv->plat->rx_coe = STMMAC_RX_COE_NONE;
		priv->hw->rx_csum = 0;
	}

	/* Enable the MAC Rx/Tx */
	stmmac_mac_set(priv, priv->ioaddr, true);

	/* Set the HW DMA mode and the COE */
	stmmac_dma_operation_mode(priv);

	stmmac_mmc_setup(priv);

	if (priv->use_riwt) {
		u32 queue;

		for (queue = 0; queue < rx_cnt; queue++) {
			if (!priv->rx_riwt[queue])
				priv->rx_riwt[queue] = DEF_DMA_RIWT;

			stmmac_rx_watchdog(priv, priv->ioaddr,
					   priv->rx_riwt[queue], queue);
		}
	}

	/* set TX and RX rings length */
	stmmac_set_rings_length(priv);

	/* Enable TSO */
	if (priv->dma_cap.tsoen && priv->plat->flags & STMMAC_FLAG_TSO_EN) {
		for (chan = 0; chan < tx_cnt; chan++) {
			if (!stmmac_tso_channel_permitted(priv, chan))
				continue;

			stmmac_enable_tso(priv, priv->ioaddr, 1, chan);
		}
	}

	/* Enable Split Header */
	sph_en = (priv->hw->rx_csum > 0) && priv->sph_active;
	for (chan = 0; chan < rx_cnt; chan++)
		stmmac_enable_sph(priv, priv->ioaddr, sph_en, chan);


	/* VLAN Tag Insertion */
	if (priv->dma_cap.vlins)
		stmmac_enable_vlan(priv, priv->hw, STMMAC_VLAN_INSERT);

	/* TBS */
	for (chan = 0; chan < tx_cnt; chan++) {
		struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[chan];
		int enable = tx_q->tbs & STMMAC_TBS_AVAIL;

		stmmac_enable_tbs(priv, priv->ioaddr, enable, chan);
	}

	/* Configure real RX and TX queues */
	netif_set_real_num_rx_queues(dev, priv->plat->rx_queues_to_use);
	netif_set_real_num_tx_queues(dev, priv->plat->tx_queues_to_use);

	/* Start the ball rolling... */
	stmmac_start_all_dma(priv);

	phylink_rx_clk_stop_block(priv->phylink);
	stmmac_set_hw_vlan_mode(priv, priv->hw);
	phylink_rx_clk_stop_unblock(priv->phylink);

	return 0;
}

static void stmmac_free_irq(struct net_device *dev,
			    enum request_irq_err irq_err, int irq_idx)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	struct stmmac_msi *msi = priv->msi;
	int j;

	switch (irq_err) {
	case REQ_IRQ_ERR_ALL:
		irq_idx = priv->plat->tx_queues_to_use;
		fallthrough;
	case REQ_IRQ_ERR_TX:
		for (j = irq_idx - 1; msi && j >= 0; j--) {
			if (msi->tx_irq[j] > 0) {
				irq_set_affinity_hint(msi->tx_irq[j], NULL);
				free_irq(msi->tx_irq[j],
					 &priv->dma_conf.tx_queue[j]);
			}
		}
		irq_idx = priv->plat->rx_queues_to_use;
		fallthrough;
	case REQ_IRQ_ERR_RX:
		for (j = irq_idx - 1; msi && j >= 0; j--) {
			if (msi->rx_irq[j] > 0) {
				irq_set_affinity_hint(msi->rx_irq[j], NULL);
				free_irq(msi->rx_irq[j],
					 &priv->dma_conf.rx_queue[j]);
			}
		}

		if (msi && msi->sfty_ue_irq > 0 && msi->sfty_ue_irq != dev->irq)
			free_irq(msi->sfty_ue_irq, dev);
		fallthrough;
	case REQ_IRQ_ERR_SFTY_UE:
		if (msi && msi->sfty_ce_irq > 0 && msi->sfty_ce_irq != dev->irq)
			free_irq(msi->sfty_ce_irq, dev);
		fallthrough;
	case REQ_IRQ_ERR_SFTY_CE:
		if (priv->wol_irq > 0 && priv->wol_irq != dev->irq)
			free_irq(priv->wol_irq, dev);
		fallthrough;
	case REQ_IRQ_ERR_SFTY:
		if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq)
			free_irq(priv->sfty_irq, dev);
		fallthrough;
	case REQ_IRQ_ERR_WOL:
		free_irq(dev->irq, dev);
		fallthrough;
	case REQ_IRQ_ERR_MAC:
	case REQ_IRQ_ERR_NO:
		/* If MAC IRQ request error, no more IRQ to free */
		break;
	}
}

static int stmmac_msi_init(struct stmmac_priv *priv,
			   struct stmmac_resources *res)
{
	int i;

	priv->msi = devm_kmalloc(priv->device, sizeof(*priv->msi), GFP_KERNEL);
	if (!priv->msi)
		return -ENOMEM;

	priv->msi->sfty_ce_irq = res->sfty_ce_irq;
	priv->msi->sfty_ue_irq = res->sfty_ue_irq;

	for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
		priv->msi->rx_irq[i] = res->rx_irq[i];
	for (i = 0; i < MTL_MAX_TX_QUEUES; i++)
		priv->msi->tx_irq[i] = res->tx_irq[i];

	return 0;
}

static int stmmac_request_irq_multi_msi(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	struct stmmac_msi *msi = priv->msi;
	enum request_irq_err irq_err;
	int irq_idx = 0;
	char *int_name;
	int ret;
	int i;

	/* For common interrupt */
	int_name = msi->int_name_mac;
	sprintf(int_name, "%s:%s", dev->name, "mac");
	ret = request_irq(dev->irq, stmmac_mac_interrupt,
			  0, int_name, dev);
	if (unlikely(ret < 0)) {
		netdev_err(priv->dev,
			   "%s: alloc mac MSI %d (error: %d)\n",
			   __func__, dev->irq, ret);
		irq_err = REQ_IRQ_ERR_MAC;
		goto irq_error;
	}

	/* Request the Wake IRQ in case of another line
	 * is used for WoL
	 */
	if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
		int_name = msi->int_name_wol;
		sprintf(int_name, "%s:%s", dev->name, "wol");
		ret = request_irq(priv->wol_irq,
				  stmmac_mac_interrupt,
				  0, int_name, dev);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: alloc wol MSI %d (error: %d)\n",
				   __func__, priv->wol_irq, ret);
			irq_err = REQ_IRQ_ERR_WOL;
			goto irq_error;
		}
	}

	/* Request the common Safety Feature Correctible/Uncorrectible
	 * Error line in case of another line is used
	 */
	if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq) {
		int_name = msi->int_name_sfty;
		sprintf(int_name, "%s:%s", dev->name, "safety");
		ret = request_irq(priv->sfty_irq, stmmac_safety_interrupt,
				  0, int_name, dev);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: alloc sfty MSI %d (error: %d)\n",
				   __func__, priv->sfty_irq, ret);
			irq_err = REQ_IRQ_ERR_SFTY;
			goto irq_error;
		}
	}

	/* Request the Safety Feature Correctible Error line in
	 * case of another line is used
	 */
	if (msi->sfty_ce_irq > 0 && msi->sfty_ce_irq != dev->irq) {
		int_name = msi->int_name_sfty_ce;
		sprintf(int_name, "%s:%s", dev->name, "safety-ce");
		ret = request_irq(msi->sfty_ce_irq,
				  stmmac_safety_interrupt,
				  0, int_name, dev);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: alloc sfty ce MSI %d (error: %d)\n",
				   __func__, msi->sfty_ce_irq, ret);
			irq_err = REQ_IRQ_ERR_SFTY_CE;
			goto irq_error;
		}
	}

	/* Request the Safety Feature Uncorrectible Error line in
	 * case of another line is used
	 */
	if (msi->sfty_ue_irq > 0 && msi->sfty_ue_irq != dev->irq) {
		int_name = msi->int_name_sfty_ue;
		sprintf(int_name, "%s:%s", dev->name, "safety-ue");
		ret = request_irq(msi->sfty_ue_irq,
				  stmmac_safety_interrupt,
				  0, int_name, dev);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: alloc sfty ue MSI %d (error: %d)\n",
				   __func__, msi->sfty_ue_irq, ret);
			irq_err = REQ_IRQ_ERR_SFTY_UE;
			goto irq_error;
		}
	}

	/* Request Rx MSI irq */
	for (i = 0; i < priv->plat->rx_queues_to_use; i++) {
		if (i >= MTL_MAX_RX_QUEUES)
			break;
		if (msi->rx_irq[i] == 0)
			continue;

		int_name = msi->int_name_rx_irq[i];
		sprintf(int_name, "%s:%s-%d", dev->name, "rx", i);
		ret = request_irq(msi->rx_irq[i],
				  stmmac_msi_intr_rx,
				  0, int_name, &priv->dma_conf.rx_queue[i]);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: alloc rx-%d  MSI %d (error: %d)\n",
				   __func__, i, msi->rx_irq[i], ret);
			irq_err = REQ_IRQ_ERR_RX;
			irq_idx = i;
			goto irq_error;
		}
		irq_set_affinity_hint(msi->rx_irq[i],
				      cpumask_of(i % num_online_cpus()));
	}

	/* Request Tx MSI irq */
	for (i = 0; i < priv->plat->tx_queues_to_use; i++) {
		if (i >= MTL_MAX_TX_QUEUES)
			break;
		if (msi->tx_irq[i] == 0)
			continue;

		int_name = msi->int_name_tx_irq[i];
		sprintf(int_name, "%s:%s-%d", dev->name, "tx", i);
		ret = request_irq(msi->tx_irq[i],
				  stmmac_msi_intr_tx,
				  0, int_name, &priv->dma_conf.tx_queue[i]);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: alloc tx-%d  MSI %d (error: %d)\n",
				   __func__, i, msi->tx_irq[i], ret);
			irq_err = REQ_IRQ_ERR_TX;
			irq_idx = i;
			goto irq_error;
		}
		irq_set_affinity_hint(msi->tx_irq[i],
				      cpumask_of(i % num_online_cpus()));
	}

	return 0;

irq_error:
	stmmac_free_irq(dev, irq_err, irq_idx);
	return ret;
}

static int stmmac_request_irq_single(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	enum request_irq_err irq_err;
	int ret;

	ret = request_irq(dev->irq, stmmac_interrupt,
			  IRQF_SHARED, dev->name, dev);
	if (unlikely(ret < 0)) {
		netdev_err(priv->dev,
			   "%s: ERROR: allocating the IRQ %d (error: %d)\n",
			   __func__, dev->irq, ret);
		irq_err = REQ_IRQ_ERR_MAC;
		goto irq_error;
	}

	/* Request the Wake IRQ in case of another line
	 * is used for WoL
	 */
	if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
		ret = request_irq(priv->wol_irq, stmmac_interrupt,
				  IRQF_SHARED, dev->name, dev);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: ERROR: allocating the WoL IRQ %d (%d)\n",
				   __func__, priv->wol_irq, ret);
			irq_err = REQ_IRQ_ERR_WOL;
			goto irq_error;
		}
	}

	/* Request the common Safety Feature Correctible/Uncorrectible
	 * Error line in case of another line is used
	 */
	if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq) {
		ret = request_irq(priv->sfty_irq, stmmac_safety_interrupt,
				  IRQF_SHARED, dev->name, dev);
		if (unlikely(ret < 0)) {
			netdev_err(priv->dev,
				   "%s: ERROR: allocating the sfty IRQ %d (%d)\n",
				   __func__, priv->sfty_irq, ret);
			irq_err = REQ_IRQ_ERR_SFTY;
			goto irq_error;
		}
	}

	return 0;

irq_error:
	stmmac_free_irq(dev, irq_err, 0);
	return ret;
}

static int stmmac_request_irq(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int ret;

	/* Request the IRQ lines */
	if (priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN)
		ret = stmmac_request_irq_multi_msi(dev);
	else
		ret = stmmac_request_irq_single(dev);

	return ret;
}

/**
 *  stmmac_setup_dma_desc - Generate a dma_conf and allocate DMA queue
 *  @priv: driver private structure
 *  @mtu: MTU to setup the dma queue and buf with
 *  Description: Allocate and generate a dma_conf based on the provided MTU.
 *  Allocate the Tx/Rx DMA queue and init them.
 *  Return value:
 *  the dma_conf allocated struct on success and an appropriate ERR_PTR on failure.
 */
static struct stmmac_dma_conf *
stmmac_setup_dma_desc(struct stmmac_priv *priv, unsigned int mtu)
{
	struct stmmac_dma_conf *dma_conf;
	int bfsize, ret;
	u8 chan;

	dma_conf = kzalloc_obj(*dma_conf);
	if (!dma_conf) {
		netdev_err(priv->dev, "%s: DMA conf allocation failed\n",
			   __func__);
		return ERR_PTR(-ENOMEM);
	}

	/* Returns 0 or BUF_SIZE_16KiB if mtu > 8KiB and dwmac4 or ring mode */
	bfsize = stmmac_set_16kib_bfsize(priv, mtu);
	if (bfsize < 0)
		bfsize = 0;

	if (bfsize < BUF_SIZE_16KiB)
		bfsize = stmmac_set_bfsize(mtu);

	dma_conf->dma_buf_sz = bfsize;
	/* Chose the tx/rx size from the already defined one in the
	 * priv struct. (if defined)
	 */
	dma_conf->dma_tx_size = priv->dma_conf.dma_tx_size;
	dma_conf->dma_rx_size = priv->dma_conf.dma_rx_size;

	if (!dma_conf->dma_tx_size)
		dma_conf->dma_tx_size = DMA_DEFAULT_TX_SIZE;
	if (!dma_conf->dma_rx_size)
		dma_conf->dma_rx_size = DMA_DEFAULT_RX_SIZE;

	/* Earlier check for TBS */
	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++) {
		struct stmmac_tx_queue *tx_q = &dma_conf->tx_queue[chan];
		int tbs_en = priv->plat->tx_queues_cfg[chan].tbs_en;

		/* Setup per-TXQ tbs flag before TX descriptor alloc */
		tx_q->tbs |= tbs_en ? STMMAC_TBS_AVAIL : 0;
	}

	ret = alloc_dma_desc_resources(priv, dma_conf);
	if (ret < 0) {
		netdev_err(priv->dev, "%s: DMA descriptors allocation failed\n",
			   __func__);
		goto alloc_error;
	}

	ret = init_dma_desc_rings(priv->dev, dma_conf, GFP_KERNEL);
	if (ret < 0) {
		netdev_err(priv->dev, "%s: DMA descriptors initialization failed\n",
			   __func__);
		goto init_error;
	}

	return dma_conf;

init_error:
	free_dma_desc_resources(priv, dma_conf);
alloc_error:
	kfree(dma_conf);
	return ERR_PTR(ret);
}

/**
 *  __stmmac_open - open entry point of the driver
 *  @dev : pointer to the device structure.
 *  @dma_conf :  structure to take the dma data
 *  Description:
 *  This function is the open entry point of the driver.
 *  Return value:
 *  0 on success and an appropriate (-)ve integer as defined in errno.h
 *  file on failure.
 */
static int __stmmac_open(struct net_device *dev,
			 struct stmmac_dma_conf *dma_conf)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 chan;
	int ret;

	for (int i = 0; i < MTL_MAX_TX_QUEUES; i++)
		if (priv->dma_conf.tx_queue[i].tbs & STMMAC_TBS_EN)
			dma_conf->tx_queue[i].tbs = priv->dma_conf.tx_queue[i].tbs;
	memcpy(&priv->dma_conf, dma_conf, sizeof(*dma_conf));

	stmmac_reset_queues_param(priv);

	ret = stmmac_hw_setup(dev);
	if (ret < 0) {
		netdev_err(priv->dev, "%s: Hw setup failed\n", __func__);
		goto init_error;
	}

	stmmac_setup_ptp(priv);

	stmmac_init_coalesce(priv);

	phylink_start(priv->phylink);

	stmmac_vlan_restore(priv);

	ret = stmmac_request_irq(dev);
	if (ret)
		goto irq_error;

	stmmac_enable_all_queues(priv);
	netif_tx_start_all_queues(priv->dev);
	stmmac_enable_all_dma_irq(priv);

	return 0;

irq_error:
	phylink_stop(priv->phylink);

	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);

	stmmac_release_ptp(priv);
init_error:
	return ret;
}

static int stmmac_open(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	struct stmmac_dma_conf *dma_conf;
	int ret;

	/* Initialise the tx lpi timer, converting from msec to usec */
	if (!priv->tx_lpi_timer)
		priv->tx_lpi_timer = eee_timer * 1000;

	dma_conf = stmmac_setup_dma_desc(priv, dev->mtu);
	if (IS_ERR(dma_conf))
		return PTR_ERR(dma_conf);

	ret = pm_runtime_resume_and_get(priv->device);
	if (ret < 0)
		goto err_dma_resources;

	ret = stmmac_init_phy(dev);
	if (ret)
		goto err_runtime_pm;

	if (!(priv->plat->flags & STMMAC_FLAG_SERDES_UP_AFTER_PHY_LINKUP)) {
		ret = stmmac_legacy_serdes_power_up(priv);
		if (ret < 0)
			goto err_disconnect_phy;
	}

	ret = __stmmac_open(dev, dma_conf);
	if (ret)
		goto err_serdes;

	kfree(dma_conf);

	/* We may have called phylink_speed_down before */
	phylink_speed_up(priv->phylink);

	return ret;

err_serdes:
	stmmac_legacy_serdes_power_down(priv);
err_disconnect_phy:
	phylink_disconnect_phy(priv->phylink);
err_runtime_pm:
	pm_runtime_put(priv->device);
err_dma_resources:
	free_dma_desc_resources(priv, dma_conf);
	kfree(dma_conf);
	return ret;
}

static void __stmmac_release(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 chan;

	/* Stop and disconnect the PHY */
	phylink_stop(priv->phylink);

	stmmac_disable_all_queues(priv);

	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);

	netif_tx_disable(dev);

	/* Free the IRQ lines */
	stmmac_free_irq(dev, REQ_IRQ_ERR_ALL, 0);

	/* Stop TX/RX DMA and clear the descriptors */
	stmmac_stop_all_dma(priv);

	/* Release and free the Rx/Tx resources */
	free_dma_desc_resources(priv, &priv->dma_conf);

	stmmac_release_ptp(priv);

	if (stmmac_fpe_supported(priv))
		ethtool_mmsv_stop(&priv->fpe_cfg.mmsv);
}

/**
 *  stmmac_release - close entry point of the driver
 *  @dev : device pointer.
 *  Description:
 *  This is the stop entry point of the driver.
 */
static int stmmac_release(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	/* If the PHY or MAC has WoL enabled, then the PHY will not be
	 * suspended when phylink_stop() is called below. Set the PHY
	 * to its slowest speed to save power.
	 */
	if (device_may_wakeup(priv->device))
		phylink_speed_down(priv->phylink, false);

	__stmmac_release(dev);

	stmmac_legacy_serdes_power_down(priv);
	phylink_disconnect_phy(priv->phylink);
	pm_runtime_put(priv->device);

	return 0;
}

static bool stmmac_vlan_insert(struct stmmac_priv *priv, struct sk_buff *skb,
			       struct stmmac_tx_queue *tx_q)
{
	struct dma_desc *p;
	u16 tag = 0x0;

	if (!priv->dma_cap.vlins || !skb_vlan_tag_present(skb))
		return false;

	tag = skb_vlan_tag_get(skb);

	if (tx_q->tbs & STMMAC_TBS_AVAIL)
		p = &tx_q->dma_entx[tx_q->cur_tx].basic;
	else
		p = &tx_q->dma_tx[tx_q->cur_tx];

	if (stmmac_set_desc_vlan_tag(priv, p, tag, 0x0, 0x0))
		return false;

	stmmac_set_tx_owner(priv, p);
	tx_q->cur_tx = STMMAC_NEXT_ENTRY(tx_q->cur_tx, priv->dma_conf.dma_tx_size);
	return true;
}

/**
 *  stmmac_tso_allocator - close entry point of the driver
 *  @priv: driver private structure
 *  @des: buffer start address
 *  @total_len: total length to fill in descriptors
 *  @last_segment: condition for the last descriptor
 *  @queue: TX queue index
 *  Description:
 *  This function fills descriptor and request new descriptors according to
 *  buffer length to fill
 */
static void stmmac_tso_allocator(struct stmmac_priv *priv, dma_addr_t des,
				 int total_len, bool last_segment, u32 queue)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
	struct dma_desc *desc;
	u32 buff_size;
	int tmp_len;

	tmp_len = total_len;

	while (tmp_len > 0) {
		dma_addr_t curr_addr;

		tx_q->cur_tx = STMMAC_NEXT_ENTRY(tx_q->cur_tx,
						priv->dma_conf.dma_tx_size);
		WARN_ON(tx_q->tx_skbuff[tx_q->cur_tx]);

		if (tx_q->tbs & STMMAC_TBS_AVAIL)
			desc = &tx_q->dma_entx[tx_q->cur_tx].basic;
		else
			desc = &tx_q->dma_tx[tx_q->cur_tx];

		curr_addr = des + (total_len - tmp_len);
		stmmac_set_desc_addr(priv, desc, curr_addr);
		buff_size = tmp_len >= TSO_MAX_BUFF_SIZE ?
			    TSO_MAX_BUFF_SIZE : tmp_len;

		stmmac_prepare_tso_tx_desc(priv, desc, 0, buff_size,
				0, 1,
				(last_segment) && (tmp_len <= TSO_MAX_BUFF_SIZE),
				0, 0);

		tmp_len -= TSO_MAX_BUFF_SIZE;
	}
}

static void stmmac_flush_tx_descriptors(struct stmmac_priv *priv, int queue)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];

	/* The own bit must be the latest setting done when prepare the
	 * descriptor and then barrier is needed to make sure that
	 * all is coherent before granting the DMA engine.
	 */
	wmb();

	stmmac_set_queue_tx_tail_ptr(priv, tx_q, queue, tx_q->cur_tx);
}

static void stmmac_set_gso_types(struct stmmac_priv *priv, bool tso)
{
	if (!tso) {
		priv->gso_enabled_types = 0;
	} else {
		/* Manage oversized TCP frames for GMAC4 device */
		priv->gso_enabled_types = SKB_GSO_TCPV4 | SKB_GSO_TCPV6;
		if (priv->plat->core_type == DWMAC_CORE_GMAC4)
			priv->gso_enabled_types |= SKB_GSO_UDP_L4;
	}
}

static void stmmac_set_gso_features(struct net_device *ndev)
{
	struct stmmac_priv *priv = netdev_priv(ndev);
	const struct stmmac_dma_cfg *dma_cfg;
	int txpbl;

	if (priv->dma_cap.tsoen)
		dev_info(priv->device, "TSO supported\n");

	if (!(priv->plat->flags & STMMAC_FLAG_TSO_EN))
		return;

	if (!priv->dma_cap.tsoen) {
		dev_warn(priv->device, "platform requests unsupported TSO\n");
		return;
	}

	/* FIXME:
	 *  STM32MP151 (v4.2 userver v4.0) states that TxPBL must be >= 4. It
	 *  is not clear whether PBLx8 (which multiplies the PBL value by 8)
	 *  influences this.
	 */
	dma_cfg = priv->plat->dma_cfg;
	txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
	if (txpbl < 4) {
		dev_warn(priv->device, "txpbl(%d) is too low for TSO\n", txpbl);
		return;
	}

	ndev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
	if (priv->plat->core_type == DWMAC_CORE_GMAC4)
		ndev->hw_features |= NETIF_F_GSO_UDP_L4;

	stmmac_set_gso_types(priv, true);

	dev_info(priv->device, "TSO feature enabled\n");
}

static size_t stmmac_tso_header_size(struct sk_buff *skb)
{
	size_t size;

	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
		size = skb_transport_offset(skb) + sizeof(struct udphdr);
	else
		size = skb_tcp_all_headers(skb);

	return size;
}

/* STM32MP151 (dwmac v4.2) and STM32MP25xx (dwmac v5.3) states for TDES2 normal
 * (read format) descriptor that the maximum header length supported for the
 * TSO feature is 1023 bytes.
 *
 * While IPv4 is limited to MAC+VLAN+IPv4+ext+TCP+ext = 138 bytes, the IPv6
 * extension headers aren't similarly limited.
 *
 * Fall back to software GSO for these skbs. Also check that the MSS is >=
 * the recommended 64 bytes (documented in ETH_DMACxCR register description),
 * and that a the header plus MSS is not larger than 16383 (documented in
 * "Building the Descriptor and the packet for the TSO feature").
 */
static bool stmmac_tso_valid_packet(struct sk_buff *skb)
{
	size_t header_len = stmmac_tso_header_size(skb);
	unsigned int gso_size = skb_shinfo(skb)->gso_size;

	return header_len <= 1023 && gso_size >= 64 &&
	       header_len + gso_size < 16383;
}

/**
 *  stmmac_tso_xmit - Tx entry point of the driver for oversized frames (TSO)
 *  @skb : the socket buffer
 *  @dev : device pointer
 *  Description: this is the transmit function that is called on TSO frames
 *  (support available on GMAC4 and newer chips).
 *  Diagram below show the ring programming in case of TSO frames:
 *
 *  First Descriptor
 *   --------
 *   | DES0 |---> buffer1 = L2/L3/L4 header
 *   | DES1 |---> can be used as buffer2 for TCP Payload if the DMA AXI address
 *   |      |     width is 32-bit, but we never use it.
 *   |      |     Also can be used as the most-significant 8-bits or 16-bits of
 *   |      |     buffer1 address pointer if the DMA AXI address width is 40-bit
 *   |      |     or 48-bit, and we always use it.
 *   | DES2 |---> buffer1 len
 *   | DES3 |---> must set TSE, TCP hdr len-> [22:19]. TCP payload len [17:0]
 *   --------
 *   --------
 *   | DES0 |---> buffer1 = TCP Payload (can continue on next descr...)
 *   | DES1 |---> same as the First Descriptor
 *   | DES2 |---> buffer1 len
 *   | DES3 |
 *   --------
 *	|
 *     ...
 *	|
 *   --------
 *   | DES0 |---> buffer1 = Split TCP Payload
 *   | DES1 |---> same as the First Descriptor
 *   | DES2 |---> buffer1 len
 *   | DES3 |
 *   --------
 *
 * mss is fixed when enable tso, so w/o programming the TDES3 ctx field.
 */
static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct dma_desc *desc, *first, *mss_desc = NULL;
	struct stmmac_priv *priv = netdev_priv(dev);
	unsigned int first_entry, tx_packets;
	struct stmmac_txq_stats *txq_stats;
	struct stmmac_tx_queue *tx_q;
	bool set_ic, is_last_segment;
	u32 pay_len, mss, queue;
	int i, first_tx, nfrags;
	u8 proto_hdr_len, hdr;
	dma_addr_t des;

	nfrags = skb_shinfo(skb)->nr_frags;
	queue = skb_get_queue_mapping(skb);

	tx_q = &priv->dma_conf.tx_queue[queue];
	txq_stats = &priv->xstats.txq_stats[queue];
	first_tx = tx_q->cur_tx;

	/* Compute header lengths */
	proto_hdr_len = stmmac_tso_header_size(skb);
	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
		hdr = sizeof(struct udphdr);
	else
		hdr = tcp_hdrlen(skb);

	/* Desc availability based on threshold should be enough safe */
	if (unlikely(stmmac_tx_avail(priv, queue) <
		(((skb->len - proto_hdr_len) / TSO_MAX_BUFF_SIZE + 1)))) {
		if (!netif_tx_queue_stopped(netdev_get_tx_queue(dev, queue))) {
			netif_tx_stop_queue(netdev_get_tx_queue(priv->dev,
								queue));
			/* This is a hard error, log it. */
			netdev_err(priv->dev,
				   "%s: Tx Ring full when queue awake\n",
				   __func__);
		}
		return NETDEV_TX_BUSY;
	}

	pay_len = skb_headlen(skb) - proto_hdr_len; /* no frags */

	mss = skb_shinfo(skb)->gso_size;

	/* set new MSS value if needed */
	if (mss != tx_q->mss) {
		if (tx_q->tbs & STMMAC_TBS_AVAIL)
			mss_desc = &tx_q->dma_entx[tx_q->cur_tx].basic;
		else
			mss_desc = &tx_q->dma_tx[tx_q->cur_tx];

		stmmac_set_mss(priv, mss_desc, mss);
		tx_q->mss = mss;
		tx_q->cur_tx = STMMAC_NEXT_ENTRY(tx_q->cur_tx,
						priv->dma_conf.dma_tx_size);
		WARN_ON(tx_q->tx_skbuff[tx_q->cur_tx]);
	}

	if (netif_msg_tx_queued(priv)) {
		pr_info("%s: hdrlen %d, hdr_len %d, pay_len %d, mss %d\n",
			__func__, hdr, proto_hdr_len, pay_len, mss);
		pr_info("\tskb->len %d, skb->data_len %d\n", skb->len,
			skb->data_len);
	}

	first_entry = tx_q->cur_tx;
	WARN_ON(tx_q->tx_skbuff[first_entry]);

	if (tx_q->tbs & STMMAC_TBS_AVAIL)
		desc = &tx_q->dma_entx[first_entry].basic;
	else
		desc = &tx_q->dma_tx[first_entry];
	first = desc;

	/* first descriptor: fill Headers on Buf1 */
	des = dma_map_single(priv->device, skb->data, skb_headlen(skb),
			     DMA_TO_DEVICE);
	if (dma_mapping_error(priv->device, des))
		goto dma_map_err;

	stmmac_set_desc_addr(priv, first, des);
	stmmac_tso_allocator(priv, des + proto_hdr_len, pay_len,
			     (nfrags == 0), queue);

	/* In case two or more DMA transmit descriptors are allocated for this
	 * non-paged SKB data, the DMA buffer address should be saved to
	 * tx_q->tx_skbuff_dma[].buf corresponding to the last descriptor,
	 * and leave the other tx_q->tx_skbuff_dma[].buf as NULL to guarantee
	 * that stmmac_tx_clean() does not unmap the entire DMA buffer too early
	 * since the tail areas of the DMA buffer can be accessed by DMA engine
	 * sooner or later.
	 * By saving the DMA buffer address to tx_q->tx_skbuff_dma[].buf
	 * corresponding to the last descriptor, stmmac_tx_clean() will unmap
	 * this DMA buffer right after the DMA engine completely finishes the
	 * full buffer transmission.
	 */
	stmmac_set_tx_skb_dma_entry(tx_q, tx_q->cur_tx, des, skb_headlen(skb),
				    false);

	/* Prepare fragments */
	for (i = 0; i < nfrags; i++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

		des = skb_frag_dma_map(priv->device, frag, 0,
				       skb_frag_size(frag),
				       DMA_TO_DEVICE);
		if (dma_mapping_error(priv->device, des))
			goto dma_map_err;

		stmmac_tso_allocator(priv, des, skb_frag_size(frag),
				     (i == nfrags - 1), queue);

		stmmac_set_tx_skb_dma_entry(tx_q, tx_q->cur_tx, des,
					    skb_frag_size(frag), true);
	}

	stmmac_set_tx_dma_last_segment(tx_q, tx_q->cur_tx);

	/* Only the last descriptor gets to point to the skb. */
	tx_q->tx_skbuff[tx_q->cur_tx] = skb;

	/* Manage tx mitigation */
	tx_packets = CIRC_CNT(tx_q->cur_tx + 1, first_tx,
			      priv->dma_conf.dma_tx_size);
	tx_q->tx_count_frames += tx_packets;

	if ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && priv->hwts_tx_en)
		set_ic = true;
	else if (!priv->tx_coal_frames[queue])
		set_ic = false;
	else if (tx_packets > priv->tx_coal_frames[queue])
		set_ic = true;
	else if ((tx_q->tx_count_frames %
		  priv->tx_coal_frames[queue]) < tx_packets)
		set_ic = true;
	else
		set_ic = false;

	if (set_ic) {
		if (tx_q->tbs & STMMAC_TBS_AVAIL)
			desc = &tx_q->dma_entx[tx_q->cur_tx].basic;
		else
			desc = &tx_q->dma_tx[tx_q->cur_tx];

		tx_q->tx_count_frames = 0;
		stmmac_set_tx_ic(priv, desc);
	}

	/* We've used all descriptors we need for this skb, however,
	 * advance cur_tx so that it references a fresh descriptor.
	 * ndo_start_xmit will fill this descriptor the next time it's
	 * called and stmmac_tx_clean may clean up to this descriptor.
	 */
	tx_q->cur_tx = STMMAC_NEXT_ENTRY(tx_q->cur_tx, priv->dma_conf.dma_tx_size);

	if (unlikely(stmmac_tx_avail(priv, queue) <= (MAX_SKB_FRAGS + 1))) {
		netif_dbg(priv, hw, priv->dev, "%s: stop transmitted packets\n",
			  __func__);
		netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
	}

	u64_stats_update_begin(&txq_stats->q_syncp);
	u64_stats_add(&txq_stats->q.tx_bytes, skb->len);
	u64_stats_inc(&txq_stats->q.tx_tso_frames);
	u64_stats_add(&txq_stats->q.tx_tso_nfrags, nfrags);
	if (set_ic)
		u64_stats_inc(&txq_stats->q.tx_set_ic_bit);
	u64_stats_update_end(&txq_stats->q_syncp);

	if (priv->sarc_type)
		stmmac_set_desc_sarc(priv, first, priv->sarc_type);

	if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
		     priv->hwts_tx_en)) {
		/* declare that device is doing timestamping */
		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
		stmmac_enable_tx_timestamp(priv, first);
	}

	/* If we only have one entry used, then the first entry is the last
	 * segment.
	 */
	is_last_segment = CIRC_CNT(tx_q->cur_tx, first_entry,
				   priv->dma_conf.dma_tx_size) == 1;

	/* Complete the first descriptor before granting the DMA */
	stmmac_prepare_tso_tx_desc(priv, first, 1, proto_hdr_len, 0, 1,
				   is_last_segment, hdr / 4,
				   skb->len - proto_hdr_len);

	/* If context desc is used to change MSS */
	if (mss_desc) {
		/* Make sure that first descriptor has been completely
		 * written, including its own bit. This is because MSS is
		 * actually before first descriptor, so we need to make
		 * sure that MSS's own bit is the last thing written.
		 */
		dma_wmb();
		stmmac_set_tx_owner(priv, mss_desc);
	}

	if (netif_msg_pktdata(priv)) {
		pr_info("%s: curr=%d dirty=%d f=%d, e=%d, f_p=%p, nfrags %d\n",
			__func__, tx_q->cur_tx, tx_q->dirty_tx, first_entry,
			tx_q->cur_tx, first, nfrags);
		pr_info(">>> frame to be transmitted: ");
		print_pkt(skb->data, skb_headlen(skb));
	}

	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
	skb_tx_timestamp(skb);

	stmmac_flush_tx_descriptors(priv, queue);
	stmmac_tx_timer_arm(priv, queue);

	return NETDEV_TX_OK;

dma_map_err:
	dev_err(priv->device, "Tx dma map failed\n");
	dev_kfree_skb(skb);
	priv->xstats.tx_dropped++;
	return NETDEV_TX_OK;
}

/**
 * stmmac_has_ip_ethertype() - Check if packet has IP ethertype
 * @skb: socket buffer to check
 *
 * Check if a packet has an ethertype that will trigger the IP header checks
 * and IP/TCP checksum engine of the stmmac core.
 *
 * Return: true if the ethertype can trigger the checksum engine, false
 * otherwise
 */
static bool stmmac_has_ip_ethertype(struct sk_buff *skb)
{
	int depth = 0;
	__be16 proto;

	proto = __vlan_get_protocol(skb, eth_header_parse_protocol(skb),
				    &depth);

	return (depth <= ETH_HLEN) &&
		(proto == htons(ETH_P_IP) || proto == htons(ETH_P_IPV6));
}

/**
 *  stmmac_xmit - Tx entry point of the driver
 *  @skb : the socket buffer
 *  @dev : device pointer
 *  Description : this is the tx entry point of the driver.
 *  It programs the chain or the ring and supports oversized frames
 *  and SG feature.
 */
static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
{
	bool enh_desc, has_vlan, set_ic, is_jumbo = false;
	struct stmmac_priv *priv = netdev_priv(dev);
	unsigned int nopaged_len = skb_headlen(skb);
	u32 queue = skb_get_queue_mapping(skb);
	int nfrags = skb_shinfo(skb)->nr_frags;
	unsigned int first_entry, tx_packets;
	struct stmmac_txq_stats *txq_stats;
	struct dma_desc *desc, *first_desc;
	struct stmmac_tx_queue *tx_q;
	int i, csum_insertion = 0;
	int entry, first_tx;
	dma_addr_t dma_addr;
	u32 sdu_len;

	if (priv->tx_path_in_lpi_mode && priv->eee_sw_timer_en)
		stmmac_stop_sw_lpi(priv);

	if (skb_is_gso(skb) &&
	    skb_shinfo(skb)->gso_type & priv->gso_enabled_types)
		return stmmac_tso_xmit(skb, dev);

	if (priv->est && priv->est->enable &&
	    priv->est->max_sdu[queue]) {
		sdu_len = skb->len;
		/* Add VLAN tag length if VLAN tag insertion offload is requested */
		if (priv->dma_cap.vlins && skb_vlan_tag_present(skb))
			sdu_len += VLAN_HLEN;
		if (sdu_len > priv->est->max_sdu[queue]) {
			priv->xstats.max_sdu_txq_drop[queue]++;
			goto max_sdu_err;
		}
	}

	if (unlikely(stmmac_tx_avail(priv, queue) < nfrags + 1)) {
		if (!netif_tx_queue_stopped(netdev_get_tx_queue(dev, queue))) {
			netif_tx_stop_queue(netdev_get_tx_queue(priv->dev,
								queue));
			/* This is a hard error, log it. */
			netdev_err(priv->dev,
				   "%s: Tx Ring full when queue awake\n",
				   __func__);
		}
		return NETDEV_TX_BUSY;
	}

	tx_q = &priv->dma_conf.tx_queue[queue];
	first_tx = tx_q->cur_tx;

	/* Check if VLAN can be inserted by HW */
	has_vlan = stmmac_vlan_insert(priv, skb, tx_q);

	entry = tx_q->cur_tx;
	first_entry = entry;
	WARN_ON(tx_q->tx_skbuff[first_entry]);

	desc = stmmac_get_tx_desc(priv, tx_q, entry);
	first_desc = desc;

	if (has_vlan)
		stmmac_set_desc_vlan(priv, first_desc, STMMAC_VLAN_INSERT);

	enh_desc = priv->plat->enh_desc;
	/* To program the descriptors according to the size of the frame */
	if (enh_desc)
		is_jumbo = stmmac_is_jumbo_frm(priv, skb->len, enh_desc);

	csum_insertion = skb->ip_summed == CHECKSUM_PARTIAL;

	if (unlikely(is_jumbo)) {
		entry = stmmac_jumbo_frm(priv, tx_q, skb, csum_insertion);
		if (unlikely(entry < 0) && (entry != -EINVAL))
			goto dma_map_err;
	} else {
		bool last_segment = (nfrags == 0);

		dma_addr = dma_map_single(priv->device, skb->data,
					  nopaged_len, DMA_TO_DEVICE);
		if (dma_mapping_error(priv->device, dma_addr))
			goto dma_map_err;

		stmmac_set_tx_skb_dma_entry(tx_q, first_entry, dma_addr,
					    nopaged_len, false);

		stmmac_set_desc_addr(priv, first_desc, dma_addr);

		if (last_segment)
			stmmac_set_tx_dma_last_segment(tx_q, first_entry);

		if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
			     priv->hwts_tx_en)) {
			/* declare that device is doing timestamping */
			skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
			stmmac_enable_tx_timestamp(priv, first_desc);
		}

		/* Prepare the first descriptor without setting the OWN bit */
		stmmac_prepare_tx_desc(priv, first_desc, 1, nopaged_len,
				       csum_insertion, priv->descriptor_mode,
				       0, last_segment, skb->len);
	}

	if (priv->sarc_type)
		stmmac_set_desc_sarc(priv, first_desc, priv->sarc_type);

	/* STMMAC_TBS_EN can only be set if STMMAC_TBS_AVAIL has already
	 * been set, which means the underlying type of the descriptors
	 * will be struct stmmac_edesc. Therefore, it is safe to convert
	 * the basic descriptor to the enhanced descriptor here.
	 */
	if (tx_q->tbs & STMMAC_TBS_EN) {
		struct timespec64 ts = ns_to_timespec64(skb->tstamp);

		stmmac_set_desc_tbs(priv, dma_desc_to_edesc(first_desc),
				    ts.tv_sec, ts.tv_nsec);
	}

	for (i = 0; i < nfrags; i++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		unsigned int frag_size = skb_frag_size(frag);
		bool last_segment = (i == (nfrags - 1));

		entry = STMMAC_NEXT_ENTRY(entry, priv->dma_conf.dma_tx_size);
		WARN_ON(tx_q->tx_skbuff[entry]);

		desc = stmmac_get_tx_desc(priv, tx_q, entry);

		dma_addr = skb_frag_dma_map(priv->device, frag, 0, frag_size,
					    DMA_TO_DEVICE);
		if (dma_mapping_error(priv->device, dma_addr))
			goto dma_map_err; /* should reuse desc w/o issues */

		stmmac_set_tx_skb_dma_entry(tx_q, entry, dma_addr, frag_size,
					    true);
		stmmac_set_desc_addr(priv, desc, dma_addr);

		/* Prepare the descriptor and set the own bit too */
		stmmac_prepare_tx_desc(priv, desc, 0, frag_size, csum_insertion,
				       priv->descriptor_mode, 1, last_segment,
				       skb->len);
	}

	stmmac_set_tx_dma_last_segment(tx_q, entry);

	/* Only the last descriptor gets to point to the skb. */
	tx_q->tx_skbuff[entry] = skb;

	/* According to the coalesce parameter the IC bit for the latest
	 * segment is reset and the timer re-started to clean the tx status.
	 * This approach takes care about the fragments: desc is the first
	 * element in case of no SG.
	 */
	tx_packets = CIRC_CNT(entry + 1, first_tx, priv->dma_conf.dma_tx_size);
	tx_q->tx_count_frames += tx_packets;

	if ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && priv->hwts_tx_en)
		set_ic = true;
	else if (!priv->tx_coal_frames[queue])
		set_ic = false;
	else if (tx_packets > priv->tx_coal_frames[queue])
		set_ic = true;
	else if ((tx_q->tx_count_frames %
		  priv->tx_coal_frames[queue]) < tx_packets)
		set_ic = true;
	else
		set_ic = false;

	if (set_ic) {
		desc = stmmac_get_tx_desc(priv, tx_q, entry);
		tx_q->tx_count_frames = 0;
		stmmac_set_tx_ic(priv, desc);
	}

	/* We've used all descriptors we need for this skb, however,
	 * advance cur_tx so that it references a fresh descriptor.
	 * ndo_start_xmit will fill this descriptor the next time it's
	 * called and stmmac_tx_clean may clean up to this descriptor.
	 */
	entry = STMMAC_NEXT_ENTRY(entry, priv->dma_conf.dma_tx_size);
	tx_q->cur_tx = entry;

	if (netif_msg_pktdata(priv)) {
		netdev_dbg(priv->dev,
			   "%s: curr=%d dirty=%d f=%d, e=%d, first=%p, nfrags=%d",
			   __func__, tx_q->cur_tx, tx_q->dirty_tx, first_entry,
			   entry, first_desc, nfrags);

		netdev_dbg(priv->dev, ">>> frame to be transmitted: ");
		print_pkt(skb->data, skb->len);
	}

	if (unlikely(stmmac_tx_avail(priv, queue) <= (MAX_SKB_FRAGS + 1))) {
		netif_dbg(priv, hw, priv->dev, "%s: stop transmitted packets\n",
			  __func__);
		netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
	}

	txq_stats = &priv->xstats.txq_stats[queue];
	u64_stats_update_begin(&txq_stats->q_syncp);
	u64_stats_add(&txq_stats->q.tx_bytes, skb->len);
	if (set_ic)
		u64_stats_inc(&txq_stats->q.tx_set_ic_bit);
	u64_stats_update_end(&txq_stats->q_syncp);

	/* Set the OWN bit on the first descriptor now that all descriptors
	 * for this skb are populated.
	 */
	stmmac_set_tx_owner(priv, first_desc);

	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);

	stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
	skb_tx_timestamp(skb);
	stmmac_flush_tx_descriptors(priv, queue);
	stmmac_tx_timer_arm(priv, queue);

	return NETDEV_TX_OK;

dma_map_err:
	netdev_err(priv->dev, "Tx DMA map failed\n");
max_sdu_err:
	dev_kfree_skb(skb);
	priv->xstats.tx_dropped++;
	return NETDEV_TX_OK;
}

static netdev_features_t stmmac_features_check(struct sk_buff *skb,
					       struct net_device *dev,
					       netdev_features_t features)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u16 queue = skb_get_queue_mapping(skb);

	/* DWMAC IPs can be synthesized to support tx coe only for a few tx
	 * queues. In that case, checksum offloading for those queues that don't
	 * support tx coe needs to fallback to software checksum calculation.
	 *
	 * Packets that won't trigger the COE e.g. most DSA-tagged packets will
	 * also have to be checksummed in software.
	 *
	 * Note that disabling hardware checksumming also disables TSO. See
	 * harmonize_features() in net/core/dev.c
	 */
	if (priv->plat->tx_queues_cfg[queue].coe_unsupported ||
	    !stmmac_has_ip_ethertype(skb))
		features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);

	if (skb_is_gso(skb)) {
		if (!stmmac_tso_channel_permitted(priv, queue) ||
		    !stmmac_tso_valid_packet(skb))
			features &= ~NETIF_F_GSO_MASK;

		/* If we are going to be using hardware TSO, always insert
		 * VLAN tag to SKB payload for TSO frames.
		 *
		 * Never insert VLAN tag by HW, since segments split by
		 * TSO engine will be un-tagged by mistake.
		 */
		if (features & NETIF_F_GSO_MASK)
			features &= ~(NETIF_F_HW_VLAN_STAG_TX |
				      NETIF_F_HW_VLAN_CTAG_TX);
	}

	return vlan_features_check(skb, features);
}

static void stmmac_rx_vlan(struct net_device *dev, struct sk_buff *skb)
{
	struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
	__be16 vlan_proto = veth->h_vlan_proto;
	u16 vlanid;

	if ((vlan_proto == htons(ETH_P_8021Q) &&
	     dev->features & NETIF_F_HW_VLAN_CTAG_RX) ||
	    (vlan_proto == htons(ETH_P_8021AD) &&
	     dev->features & NETIF_F_HW_VLAN_STAG_RX)) {
		/* pop the vlan tag */
		vlanid = ntohs(veth->h_vlan_TCI);
		memmove(skb->data + VLAN_HLEN, veth, ETH_ALEN * 2);
		skb_pull(skb, VLAN_HLEN);
		__vlan_hwaccel_put_tag(skb, vlan_proto, vlanid);
	}
}

/**
 * stmmac_rx_refill - refill used skb preallocated buffers
 * @priv: driver private structure
 * @queue: RX queue index
 * Description : this is to reallocate the skb for the reception process
 * that is based on zero-copy.
 */
static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
	int dirty = stmmac_rx_dirty(priv, queue);
	unsigned int entry = rx_q->dirty_rx;
	gfp_t gfp = (GFP_ATOMIC | __GFP_NOWARN);

	if (priv->dma_cap.host_dma_width <= 32)
		gfp |= GFP_DMA32;

	while (dirty-- > 0) {
		struct stmmac_rx_buffer *buf = &rx_q->buf_pool[entry];
		struct dma_desc *p;
		bool use_rx_wd;

		p = stmmac_get_rx_desc(priv, rx_q, entry);

		if (!buf->page) {
			buf->page = page_pool_alloc_pages(rx_q->page_pool, gfp);
			if (!buf->page)
				break;
		}

		if (priv->sph_active && !buf->sec_page) {
			buf->sec_page = page_pool_alloc_pages(rx_q->page_pool, gfp);
			if (!buf->sec_page)
				break;

			buf->sec_addr = page_pool_get_dma_addr(buf->sec_page);
		}

		buf->addr = page_pool_get_dma_addr(buf->page) + buf->page_offset;

		stmmac_set_desc_addr(priv, p, buf->addr);
		if (priv->sph_active)
			stmmac_set_desc_sec_addr(priv, p, buf->sec_addr, true);
		else
			stmmac_set_desc_sec_addr(priv, p, buf->sec_addr, false);
		stmmac_refill_desc3(priv, rx_q, p);

		rx_q->rx_count_frames++;
		rx_q->rx_count_frames += priv->rx_coal_frames[queue];
		if (rx_q->rx_count_frames > priv->rx_coal_frames[queue])
			rx_q->rx_count_frames = 0;

		use_rx_wd = !priv->rx_coal_frames[queue];
		use_rx_wd |= rx_q->rx_count_frames > 0;
		if (!priv->use_riwt)
			use_rx_wd = false;

		dma_wmb();
		stmmac_set_rx_owner(priv, p, use_rx_wd);

		entry = STMMAC_NEXT_ENTRY(entry, priv->dma_conf.dma_rx_size);
	}
	rx_q->dirty_rx = entry;
	stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->dirty_rx);
	/* Wake up Rx DMA from the suspend state if required */
	stmmac_enable_dma_reception(priv, priv->ioaddr, queue);
}

static unsigned int stmmac_rx_buf1_len(struct stmmac_priv *priv,
				       struct dma_desc *p,
				       int status, unsigned int len)
{
	unsigned int plen = 0, hlen = 0;
	int coe = priv->hw->rx_csum;

	/* Not first descriptor, buffer is always zero */
	if (priv->sph_active && len)
		return 0;

	/* First descriptor, get split header length */
	stmmac_get_rx_header_len(priv, p, &hlen);
	if (priv->sph_active && hlen) {
		priv->xstats.rx_split_hdr_pkt_n++;
		return hlen;
	}

	/* First descriptor, not last descriptor and not split header */
	if (status & rx_not_ls)
		return priv->dma_conf.dma_buf_sz;

	plen = stmmac_get_rx_frame_len(priv, p, coe);

	/* First descriptor and last descriptor and not split header */
	return min_t(unsigned int, priv->dma_conf.dma_buf_sz, plen);
}

static unsigned int stmmac_rx_buf2_len(struct stmmac_priv *priv,
				       struct dma_desc *p,
				       int status, unsigned int len)
{
	int coe = priv->hw->rx_csum;
	unsigned int plen = 0;

	/* Not split header, buffer is not available */
	if (!priv->sph_active)
		return 0;

	/* For GMAC4, when split header is enabled, in some rare cases, the
	 * hardware does not fill buf2 of the first descriptor with payload.
	 * Thus we cannot assume buf2 is always fully filled if it is not
	 * the last descriptor. Otherwise, the length of buf2 of the second
	 * descriptor will be calculated wrong and cause an oops.
	 *
	 * If this is the last descriptor, 'plen' is the length of the
	 * received packet that was transferred to system memory.
	 * Otherwise, it is the accumulated number of bytes that have been
	 * transferred for the current packet.
	 *
	 * Thus 'plen - len' always gives the correct length of buf2.
	 */

	/* Not GMAC4 and not last descriptor */
	if (priv->plat->core_type != DWMAC_CORE_GMAC4 && (status & rx_not_ls))
		return priv->dma_conf.dma_buf_sz;

	/* GMAC4 or last descriptor */
	plen = stmmac_get_rx_frame_len(priv, p, coe);

	return plen - len;
}

static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
				struct xdp_frame *xdpf, bool dma_map)
{
	struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[queue];
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
	bool csum = !priv->plat->tx_queues_cfg[queue].coe_unsupported;
	unsigned int entry = tx_q->cur_tx;
	enum stmmac_txbuf_type buf_type;
	struct dma_desc *tx_desc;
	dma_addr_t dma_addr;
	bool set_ic;

	if (stmmac_tx_avail(priv, queue) < STMMAC_TX_THRESH(priv))
		return STMMAC_XDP_CONSUMED;

	if (priv->est && priv->est->enable &&
	    priv->est->max_sdu[queue] &&
	    xdpf->len > priv->est->max_sdu[queue]) {
		priv->xstats.max_sdu_txq_drop[queue]++;
		return STMMAC_XDP_CONSUMED;
	}

	tx_desc = stmmac_get_tx_desc(priv, tx_q, entry);
	if (dma_map) {
		dma_addr = dma_map_single(priv->device, xdpf->data,
					  xdpf->len, DMA_TO_DEVICE);
		if (dma_mapping_error(priv->device, dma_addr))
			return STMMAC_XDP_CONSUMED;

		buf_type = STMMAC_TXBUF_T_XDP_NDO;
	} else {
		struct page *page = virt_to_page(xdpf->data);

		dma_addr = page_pool_get_dma_addr(page) + sizeof(*xdpf) +
			   xdpf->headroom;
		dma_sync_single_for_device(priv->device, dma_addr,
					   xdpf->len, DMA_BIDIRECTIONAL);

		buf_type = STMMAC_TXBUF_T_XDP_TX;
	}

	stmmac_set_tx_dma_entry(tx_q, entry, buf_type, dma_addr, xdpf->len,
				false);
	stmmac_set_tx_dma_last_segment(tx_q, entry);

	tx_q->xdpf[entry] = xdpf;

	stmmac_set_desc_addr(priv, tx_desc, dma_addr);

	stmmac_prepare_tx_desc(priv, tx_desc, 1, xdpf->len,
			       csum, priv->descriptor_mode, true, true,
			       xdpf->len);

	tx_q->tx_count_frames++;

	if (tx_q->tx_count_frames % priv->tx_coal_frames[queue] == 0)
		set_ic = true;
	else
		set_ic = false;

	if (set_ic) {
		tx_q->tx_count_frames = 0;
		stmmac_set_tx_ic(priv, tx_desc);
		u64_stats_update_begin(&txq_stats->q_syncp);
		u64_stats_inc(&txq_stats->q.tx_set_ic_bit);
		u64_stats_update_end(&txq_stats->q_syncp);
	}

	stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);

	entry = STMMAC_NEXT_ENTRY(entry, priv->dma_conf.dma_tx_size);
	tx_q->cur_tx = entry;

	return STMMAC_XDP_TX;
}

static int stmmac_xdp_get_tx_queue(struct stmmac_priv *priv,
				   int cpu)
{
	int index = cpu;

	if (unlikely(index < 0))
		index = 0;

	while (index >= priv->plat->tx_queues_to_use)
		index -= priv->plat->tx_queues_to_use;

	return index;
}

static int stmmac_xdp_xmit_back(struct stmmac_priv *priv,
				struct xdp_buff *xdp)
{
	bool zc = !!(xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL);
	struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
	int cpu = smp_processor_id();
	struct netdev_queue *nq;
	int queue;
	int res;

	if (unlikely(!xdpf))
		return STMMAC_XDP_CONSUMED;

	queue = stmmac_xdp_get_tx_queue(priv, cpu);
	nq = netdev_get_tx_queue(priv->dev, queue);

	__netif_tx_lock(nq, cpu);
	/* Avoids TX time-out as we are sharing with slow path */
	txq_trans_cond_update(nq);

	/* For zero copy XDP_TX action, dma_map is true */
	res = stmmac_xdp_xmit_xdpf(priv, queue, xdpf, zc);
	if (res == STMMAC_XDP_TX) {
		stmmac_flush_tx_descriptors(priv, queue);
	} else if (res == STMMAC_XDP_CONSUMED && zc) {
		/* xdp has been freed by xdp_convert_buff_to_frame(),
		 * no need to call xsk_buff_free() again, so return
		 * STMMAC_XSK_CONSUMED.
		 */
		res = STMMAC_XSK_CONSUMED;
		xdp_return_frame(xdpf);
	}

	__netif_tx_unlock(nq);

	return res;
}

static int __stmmac_xdp_run_prog(struct stmmac_priv *priv,
				 struct bpf_prog *prog,
				 struct xdp_buff *xdp)
{
	u32 act;
	int res;

	act = bpf_prog_run_xdp(prog, xdp);
	switch (act) {
	case XDP_PASS:
		res = STMMAC_XDP_PASS;
		break;
	case XDP_TX:
		res = stmmac_xdp_xmit_back(priv, xdp);
		break;
	case XDP_REDIRECT:
		if (xdp_do_redirect(priv->dev, xdp, prog) < 0)
			res = STMMAC_XDP_CONSUMED;
		else
			res = STMMAC_XDP_REDIRECT;
		break;
	default:
		bpf_warn_invalid_xdp_action(priv->dev, prog, act);
		fallthrough;
	case XDP_ABORTED:
		trace_xdp_exception(priv->dev, prog, act);
		fallthrough;
	case XDP_DROP:
		res = STMMAC_XDP_CONSUMED;
		break;
	}

	return res;
}

static struct sk_buff *stmmac_xdp_run_prog(struct stmmac_priv *priv,
					   struct xdp_buff *xdp)
{
	struct bpf_prog *prog;
	int res;

	prog = READ_ONCE(priv->xdp_prog);
	if (!prog) {
		res = STMMAC_XDP_PASS;
		goto out;
	}

	res = __stmmac_xdp_run_prog(priv, prog, xdp);
out:
	return ERR_PTR(-res);
}

static void stmmac_finalize_xdp_rx(struct stmmac_priv *priv,
				   int xdp_status)
{
	int cpu = smp_processor_id();
	int queue;

	queue = stmmac_xdp_get_tx_queue(priv, cpu);

	if (xdp_status & STMMAC_XDP_TX)
		stmmac_tx_timer_arm(priv, queue);

	if (xdp_status & STMMAC_XDP_REDIRECT)
		xdp_do_flush();
}

static struct sk_buff *stmmac_construct_skb_zc(struct stmmac_channel *ch,
					       struct xdp_buff *xdp)
{
	unsigned int metasize = xdp->data - xdp->data_meta;
	unsigned int datasize = xdp->data_end - xdp->data;
	struct sk_buff *skb;

	skb = napi_alloc_skb(&ch->rxtx_napi,
			     xdp->data_end - xdp->data_hard_start);
	if (unlikely(!skb))
		return NULL;

	skb_reserve(skb, xdp->data - xdp->data_hard_start);
	memcpy(__skb_put(skb, datasize), xdp->data, datasize);
	if (metasize)
		skb_metadata_set(skb, metasize);

	return skb;
}

static void stmmac_dispatch_skb_zc(struct stmmac_priv *priv, u32 queue,
				   struct dma_desc *p, struct dma_desc *np,
				   struct xdp_buff *xdp)
{
	struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[queue];
	struct stmmac_channel *ch = &priv->channel[queue];
	unsigned int len = xdp->data_end - xdp->data;
	enum pkt_hash_types hash_type;
	int coe = priv->hw->rx_csum;
	struct sk_buff *skb;
	u32 hash;

	skb = stmmac_construct_skb_zc(ch, xdp);
	if (!skb) {
		priv->xstats.rx_dropped++;
		return;
	}

	stmmac_get_rx_hwtstamp(priv, p, np, skb);
	if (priv->hw->hw_vlan_en)
		/* MAC level stripping. */
		stmmac_rx_hw_vlan(priv, priv->hw, p, skb);
	else
		/* Driver level stripping. */
		stmmac_rx_vlan(priv->dev, skb);
	skb->protocol = eth_type_trans(skb, priv->dev);

	if (unlikely(!coe) || !stmmac_has_ip_ethertype(skb))
		skb_checksum_none_assert(skb);
	else
		skb->ip_summed = CHECKSUM_UNNECESSARY;

	if (!stmmac_get_rx_hash(priv, p, &hash, &hash_type))
		skb_set_hash(skb, hash, hash_type);

	skb_record_rx_queue(skb, queue);
	napi_gro_receive(&ch->rxtx_napi, skb);

	u64_stats_update_begin(&rxq_stats->napi_syncp);
	u64_stats_inc(&rxq_stats->napi.rx_pkt_n);
	u64_stats_add(&rxq_stats->napi.rx_bytes, len);
	u64_stats_update_end(&rxq_stats->napi_syncp);
}

static bool stmmac_rx_refill_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
{
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
	unsigned int entry = rx_q->dirty_rx;
	struct dma_desc *rx_desc = NULL;
	bool ret = true;

	budget = min(budget, stmmac_rx_dirty(priv, queue));

	while (budget-- > 0 && entry != rx_q->cur_rx) {
		struct stmmac_rx_buffer *buf = &rx_q->buf_pool[entry];
		dma_addr_t dma_addr;
		bool use_rx_wd;

		if (!buf->xdp) {
			buf->xdp = xsk_buff_alloc(rx_q->xsk_pool);
			if (!buf->xdp) {
				ret = false;
				break;
			}
		}

		rx_desc = stmmac_get_rx_desc(priv, rx_q, entry);

		dma_addr = xsk_buff_xdp_get_dma(buf->xdp);
		stmmac_set_desc_addr(priv, rx_desc, dma_addr);
		stmmac_set_desc_sec_addr(priv, rx_desc, 0, false);
		stmmac_refill_desc3(priv, rx_q, rx_desc);

		rx_q->rx_count_frames++;
		rx_q->rx_count_frames += priv->rx_coal_frames[queue];
		if (rx_q->rx_count_frames > priv->rx_coal_frames[queue])
			rx_q->rx_count_frames = 0;

		use_rx_wd = !priv->rx_coal_frames[queue];
		use_rx_wd |= rx_q->rx_count_frames > 0;
		if (!priv->use_riwt)
			use_rx_wd = false;

		dma_wmb();
		stmmac_set_rx_owner(priv, rx_desc, use_rx_wd);

		entry = STMMAC_NEXT_ENTRY(entry, priv->dma_conf.dma_rx_size);
	}

	if (rx_desc) {
		rx_q->dirty_rx = entry;
		stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->dirty_rx);
	}

	return ret;
}

static struct stmmac_xdp_buff *xsk_buff_to_stmmac_ctx(struct xdp_buff *xdp)
{
	/* In XDP zero copy data path, xdp field in struct xdp_buff_xsk is used
	 * to represent incoming packet, whereas cb field in the same structure
	 * is used to store driver specific info. Thus, struct stmmac_xdp_buff
	 * is laid on top of xdp and cb fields of struct xdp_buff_xsk.
	 */
	return (struct stmmac_xdp_buff *)xdp;
}

static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
{
	struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[queue];
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
	unsigned int count = 0, error = 0, len = 0;
	int dirty = stmmac_rx_dirty(priv, queue);
	unsigned int next_entry = rx_q->cur_rx;
	u32 rx_errors = 0, rx_dropped = 0;
	unsigned int desc_size;
	struct bpf_prog *prog;
	bool failure = false;
	int xdp_status = 0;
	int status = 0;

	if (netif_msg_rx_status(priv)) {
		void *rx_head = stmmac_get_rx_desc(priv, rx_q, 0);

		netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
		desc_size = stmmac_get_rx_desc_size(priv);

		stmmac_display_ring(priv, rx_head, priv->dma_conf.dma_rx_size, true,
				    rx_q->dma_rx_phy, desc_size);
	}
	while (count < limit) {
		struct stmmac_rx_buffer *buf;
		struct stmmac_xdp_buff *ctx;
		unsigned int buf1_len = 0;
		struct dma_desc *np, *p;
		int entry;
		int res;

		if (!count && rx_q->state_saved) {
			error = rx_q->state.error;
			len = rx_q->state.len;
		} else {
			rx_q->state_saved = false;
			error = 0;
			len = 0;
		}

read_again:
		if (count >= limit)
			break;

		buf1_len = 0;
		entry = next_entry;
		buf = &rx_q->buf_pool[entry];

		if (dirty >= STMMAC_RX_FILL_BATCH) {
			failure = failure ||
				  !stmmac_rx_refill_zc(priv, queue, dirty);
			dirty = 0;
		}

		p = stmmac_get_rx_desc(priv, rx_q, entry);

		/* read the status of the incoming frame */
		status = stmmac_rx_status(priv, &priv->xstats, p);
		/* check if managed by the DMA otherwise go ahead */
		if (unlikely(status & dma_own))
			break;

		/* Prefetch the next RX descriptor */
		rx_q->cur_rx = STMMAC_NEXT_ENTRY(rx_q->cur_rx,
						priv->dma_conf.dma_rx_size);
		next_entry = rx_q->cur_rx;

		np = stmmac_get_rx_desc(priv, rx_q, next_entry);

		prefetch(np);

		/* Ensure a valid XSK buffer before proceed */
		if (!buf->xdp)
			break;

		if (priv->extend_desc)
			stmmac_rx_extended_status(priv, &priv->xstats,
						  rx_q->dma_erx + entry);
		if (unlikely(status == discard_frame)) {
			xsk_buff_free(buf->xdp);
			buf->xdp = NULL;
			dirty++;
			error = 1;
			if (!priv->hwts_rx_en)
				rx_errors++;
		}

		if (unlikely(error && (status & rx_not_ls)))
			goto read_again;
		if (unlikely(error)) {
			count++;
			continue;
		}

		/* XSK pool expects RX frame 1:1 mapped to XSK buffer */
		if (likely(status & rx_not_ls)) {
			xsk_buff_free(buf->xdp);
			buf->xdp = NULL;
			dirty++;
			count++;
			goto read_again;
		}

		ctx = xsk_buff_to_stmmac_ctx(buf->xdp);
		ctx->priv = priv;
		ctx->desc = p;
		ctx->ndesc = np;

		/* XDP ZC Frame only support primary buffers for now */
		buf1_len = stmmac_rx_buf1_len(priv, p, status, len);
		len += buf1_len;

		/* ACS is disabled; strip manually. */
		if (likely(!(status & rx_not_ls))) {
			buf1_len -= ETH_FCS_LEN;
			len -= ETH_FCS_LEN;
		}

		/* RX buffer is good and fit into a XSK pool buffer */
		buf->xdp->data_end = buf->xdp->data + buf1_len;
		xsk_buff_dma_sync_for_cpu(buf->xdp);

		prog = READ_ONCE(priv->xdp_prog);
		res = __stmmac_xdp_run_prog(priv, prog, buf->xdp);

		switch (res) {
		case STMMAC_XDP_PASS:
			stmmac_dispatch_skb_zc(priv, queue, p, np, buf->xdp);
			xsk_buff_free(buf->xdp);
			break;
		case STMMAC_XDP_CONSUMED:
			xsk_buff_free(buf->xdp);
			fallthrough;
		case STMMAC_XSK_CONSUMED:
			rx_dropped++;
			break;
		case STMMAC_XDP_TX:
		case STMMAC_XDP_REDIRECT:
			xdp_status |= res;
			break;
		}

		buf->xdp = NULL;
		dirty++;
		count++;
	}

	if (status & rx_not_ls) {
		rx_q->state_saved = true;
		rx_q->state.error = error;
		rx_q->state.len = len;
	}

	stmmac_finalize_xdp_rx(priv, xdp_status);

	u64_stats_update_begin(&rxq_stats->napi_syncp);
	u64_stats_add(&rxq_stats->napi.rx_pkt_n, count);
	u64_stats_update_end(&rxq_stats->napi_syncp);

	priv->xstats.rx_dropped += rx_dropped;
	priv->xstats.rx_errors += rx_errors;

	if (xsk_uses_need_wakeup(rx_q->xsk_pool)) {
		if (failure || stmmac_rx_dirty(priv, queue) > 0)
			xsk_set_rx_need_wakeup(rx_q->xsk_pool);
		else
			xsk_clear_rx_need_wakeup(rx_q->xsk_pool);

		return (int)count;
	}

	return failure ? limit : (int)count;
}

/**
 * stmmac_rx - manage the receive process
 * @priv: driver private structure
 * @limit: napi bugget
 * @queue: RX queue index.
 * Description :  this the function called by the napi poll method.
 * It gets all the frames inside the ring.
 */
static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
{
	u32 rx_errors = 0, rx_dropped = 0, rx_bytes = 0, rx_packets = 0;
	struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[queue];
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
	struct stmmac_channel *ch = &priv->channel[queue];
	unsigned int count = 0, error = 0, len = 0;
	int status = 0, coe = priv->hw->rx_csum;
	unsigned int next_entry = rx_q->cur_rx;
	enum dma_data_direction dma_dir;
	unsigned int desc_size;
	struct sk_buff *skb = NULL;
	struct stmmac_xdp_buff ctx;
	int xdp_status = 0;
	int bufsz;

	dma_dir = page_pool_get_dma_dir(rx_q->page_pool);
	bufsz = DIV_ROUND_UP(priv->dma_conf.dma_buf_sz, PAGE_SIZE) * PAGE_SIZE;
	limit = min(priv->dma_conf.dma_rx_size - 1, (unsigned int)limit);

	if (netif_msg_rx_status(priv)) {
		void *rx_head = stmmac_get_rx_desc(priv, rx_q, 0);

		netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
		desc_size = stmmac_get_rx_desc_size(priv);

		stmmac_display_ring(priv, rx_head, priv->dma_conf.dma_rx_size, true,
				    rx_q->dma_rx_phy, desc_size);
	}
	while (count < limit) {
		unsigned int buf1_len = 0, buf2_len = 0;
		enum pkt_hash_types hash_type;
		struct stmmac_rx_buffer *buf;
		struct dma_desc *np, *p;
		int entry;
		u32 hash;

		if (!count && rx_q->state_saved) {
			skb = rx_q->state.skb;
			error = rx_q->state.error;
			len = rx_q->state.len;
		} else {
			rx_q->state_saved = false;
			skb = NULL;
			error = 0;
			len = 0;
		}

read_again:
		if (count >= limit)
			break;

		buf1_len = 0;
		buf2_len = 0;
		entry = next_entry;
		buf = &rx_q->buf_pool[entry];

		p = stmmac_get_rx_desc(priv, rx_q, entry);

		/* read the status of the incoming frame */
		status = stmmac_rx_status(priv, &priv->xstats, p);
		/* check if managed by the DMA otherwise go ahead */
		if (unlikely(status & dma_own))
			break;

		rx_q->cur_rx = STMMAC_NEXT_ENTRY(rx_q->cur_rx,
						priv->dma_conf.dma_rx_size);
		next_entry = rx_q->cur_rx;

		np = stmmac_get_rx_desc(priv, rx_q, next_entry);

		prefetch(np);

		if (priv->extend_desc)
			stmmac_rx_extended_status(priv, &priv->xstats, rx_q->dma_erx + entry);
		if (unlikely(status == discard_frame)) {
			page_pool_put_page(rx_q->page_pool, buf->page, 0, true);
			buf->page = NULL;
			error = 1;
			if (!priv->hwts_rx_en)
				rx_errors++;
		}

		if (unlikely(error && (status & rx_not_ls)))
			goto read_again;
		if (unlikely(error)) {
			dev_kfree_skb(skb);
			skb = NULL;
			count++;
			continue;
		}

		/* Buffer is good. Go on. */

		buf1_len = stmmac_rx_buf1_len(priv, p, status, len);
		len += buf1_len;
		buf2_len = stmmac_rx_buf2_len(priv, p, status, len);
		len += buf2_len;

		/* ACS is disabled; strip manually. */
		if (likely(!(status & rx_not_ls))) {
			if (buf2_len) {
				buf2_len -= ETH_FCS_LEN;
				len -= ETH_FCS_LEN;
			} else if (buf1_len) {
				buf1_len -= ETH_FCS_LEN;
				len -= ETH_FCS_LEN;
			}
		}

		if (!skb) {
			unsigned int pre_len, sync_len;

			dma_sync_single_for_cpu(priv->device, buf->addr,
						buf1_len, dma_dir);
			net_prefetch(page_address(buf->page) +
				     buf->page_offset);

			xdp_init_buff(&ctx.xdp, bufsz, &rx_q->xdp_rxq);
			xdp_prepare_buff(&ctx.xdp, page_address(buf->page),
					 buf->page_offset, buf1_len, true);

			pre_len = ctx.xdp.data_end - ctx.xdp.data_hard_start -
				  buf->page_offset;

			ctx.priv = priv;
			ctx.desc = p;
			ctx.ndesc = np;

			skb = stmmac_xdp_run_prog(priv, &ctx.xdp);
			/* Due xdp_adjust_tail: DMA sync for_device
			 * cover max len CPU touch
			 */
			sync_len = ctx.xdp.data_end - ctx.xdp.data_hard_start -
				   buf->page_offset;
			sync_len = max(sync_len, pre_len);

			/* For Not XDP_PASS verdict */
			if (IS_ERR(skb)) {
				unsigned int xdp_res = -PTR_ERR(skb);

				if (xdp_res & STMMAC_XDP_CONSUMED) {
					page_pool_put_page(rx_q->page_pool,
							   virt_to_head_page(ctx.xdp.data),
							   sync_len, true);
					buf->page = NULL;
					rx_dropped++;

					/* Clear skb as it was set as
					 * status by XDP program.
					 */
					skb = NULL;

					if (unlikely((status & rx_not_ls)))
						goto read_again;

					count++;
					continue;
				} else if (xdp_res & (STMMAC_XDP_TX |
						      STMMAC_XDP_REDIRECT)) {
					xdp_status |= xdp_res;
					buf->page = NULL;
					skb = NULL;
					count++;
					continue;
				}
			}
		}

		if (!skb) {
			unsigned int head_pad_len;

			/* XDP program may expand or reduce tail */
			buf1_len = ctx.xdp.data_end - ctx.xdp.data;

			skb = napi_build_skb(page_address(buf->page),
					     rx_q->napi_skb_frag_size);
			if (!skb) {
				page_pool_recycle_direct(rx_q->page_pool,
							 buf->page);
				rx_dropped++;
				count++;
				goto drain_data;
			}

			/* XDP program may adjust header */
			head_pad_len = ctx.xdp.data - ctx.xdp.data_hard_start;
			skb_reserve(skb, head_pad_len);
			skb_put(skb, buf1_len);
			skb_mark_for_recycle(skb);
			buf->page = NULL;
		} else if (buf1_len) {
			dma_sync_single_for_cpu(priv->device, buf->addr,
						buf1_len, dma_dir);
			skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
					buf->page, buf->page_offset, buf1_len,
					priv->dma_conf.dma_buf_sz);
			buf->page = NULL;
		}

		if (buf2_len) {
			dma_sync_single_for_cpu(priv->device, buf->sec_addr,
						buf2_len, dma_dir);
			skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
					buf->sec_page, 0, buf2_len,
					priv->dma_conf.dma_buf_sz);
			buf->sec_page = NULL;
		}

drain_data:
		if (likely(status & rx_not_ls))
			goto read_again;
		if (!skb)
			continue;

		/* Got entire packet into SKB. Finish it. */

		stmmac_get_rx_hwtstamp(priv, p, np, skb);

		if (priv->hw->hw_vlan_en)
			/* MAC level stripping. */
			stmmac_rx_hw_vlan(priv, priv->hw, p, skb);
		else
			/* Driver level stripping. */
			stmmac_rx_vlan(priv->dev, skb);

		skb->protocol = eth_type_trans(skb, priv->dev);

		if (unlikely(!coe) || !stmmac_has_ip_ethertype(skb) ||
		    (status & csum_none))
			skb_checksum_none_assert(skb);
		else
			skb->ip_summed = CHECKSUM_UNNECESSARY;

		if (!stmmac_get_rx_hash(priv, p, &hash, &hash_type))
			skb_set_hash(skb, hash, hash_type);

		skb_record_rx_queue(skb, queue);
		napi_gro_receive(&ch->rx_napi, skb);
		skb = NULL;

		rx_packets++;
		rx_bytes += len;
		count++;
	}

	if (status & rx_not_ls || skb) {
		rx_q->state_saved = true;
		rx_q->state.skb = skb;
		rx_q->state.error = error;
		rx_q->state.len = len;
	}

	stmmac_finalize_xdp_rx(priv, xdp_status);

	stmmac_rx_refill(priv, queue);

	u64_stats_update_begin(&rxq_stats->napi_syncp);
	u64_stats_add(&rxq_stats->napi.rx_packets, rx_packets);
	u64_stats_add(&rxq_stats->napi.rx_bytes, rx_bytes);
	u64_stats_add(&rxq_stats->napi.rx_pkt_n, count);
	u64_stats_update_end(&rxq_stats->napi_syncp);

	priv->xstats.rx_dropped += rx_dropped;
	priv->xstats.rx_errors += rx_errors;

	return count;
}

static int stmmac_napi_poll_rx(struct napi_struct *napi, int budget)
{
	struct stmmac_channel *ch =
		container_of(napi, struct stmmac_channel, rx_napi);
	struct stmmac_priv *priv = ch->priv_data;
	struct stmmac_rxq_stats *rxq_stats;
	u32 chan = ch->index;
	int work_done;

	rxq_stats = &priv->xstats.rxq_stats[chan];
	u64_stats_update_begin(&rxq_stats->napi_syncp);
	u64_stats_inc(&rxq_stats->napi.poll);
	u64_stats_update_end(&rxq_stats->napi_syncp);

	work_done = stmmac_rx(priv, budget, chan);
	if (work_done < budget && napi_complete_done(napi, work_done)) {
		unsigned long flags;

		spin_lock_irqsave(&ch->lock, flags);
		stmmac_enable_dma_irq(priv, priv->ioaddr, chan, 1, 0);
		spin_unlock_irqrestore(&ch->lock, flags);
	}

	return work_done;
}

static int stmmac_napi_poll_tx(struct napi_struct *napi, int budget)
{
	struct stmmac_channel *ch =
		container_of(napi, struct stmmac_channel, tx_napi);
	struct stmmac_priv *priv = ch->priv_data;
	struct stmmac_txq_stats *txq_stats;
	bool pending_packets = false;
	u32 chan = ch->index;
	int work_done;

	txq_stats = &priv->xstats.txq_stats[chan];
	u64_stats_update_begin(&txq_stats->napi_syncp);
	u64_stats_inc(&txq_stats->napi.poll);
	u64_stats_update_end(&txq_stats->napi_syncp);

	work_done = stmmac_tx_clean(priv, budget, chan, &pending_packets);
	work_done = min(work_done, budget);

	if (work_done < budget && napi_complete_done(napi, work_done)) {
		unsigned long flags;

		spin_lock_irqsave(&ch->lock, flags);
		stmmac_enable_dma_irq(priv, priv->ioaddr, chan, 0, 1);
		spin_unlock_irqrestore(&ch->lock, flags);
	}

	/* TX still have packet to handle, check if we need to arm tx timer */
	if (pending_packets)
		stmmac_tx_timer_arm(priv, chan);

	return work_done;
}

static int stmmac_napi_poll_rxtx(struct napi_struct *napi, int budget)
{
	struct stmmac_channel *ch =
		container_of(napi, struct stmmac_channel, rxtx_napi);
	struct stmmac_priv *priv = ch->priv_data;
	bool tx_pending_packets = false;
	int rx_done, tx_done, rxtx_done;
	struct stmmac_rxq_stats *rxq_stats;
	struct stmmac_txq_stats *txq_stats;
	u32 chan = ch->index;

	rxq_stats = &priv->xstats.rxq_stats[chan];
	u64_stats_update_begin(&rxq_stats->napi_syncp);
	u64_stats_inc(&rxq_stats->napi.poll);
	u64_stats_update_end(&rxq_stats->napi_syncp);

	txq_stats = &priv->xstats.txq_stats[chan];
	u64_stats_update_begin(&txq_stats->napi_syncp);
	u64_stats_inc(&txq_stats->napi.poll);
	u64_stats_update_end(&txq_stats->napi_syncp);

	tx_done = stmmac_tx_clean(priv, budget, chan, &tx_pending_packets);
	tx_done = min(tx_done, budget);

	rx_done = stmmac_rx_zc(priv, budget, chan);

	rxtx_done = max(tx_done, rx_done);

	/* If either TX or RX work is not complete, return budget
	 * and keep pooling
	 */
	if (rxtx_done >= budget)
		return budget;

	/* all work done, exit the polling mode */
	if (napi_complete_done(napi, rxtx_done)) {
		unsigned long flags;

		spin_lock_irqsave(&ch->lock, flags);
		/* Both RX and TX work done are complete,
		 * so enable both RX & TX IRQs.
		 */
		stmmac_enable_dma_irq(priv, priv->ioaddr, chan, 1, 1);
		spin_unlock_irqrestore(&ch->lock, flags);
	}

	/* TX still have packet to handle, check if we need to arm tx timer */
	if (tx_pending_packets)
		stmmac_tx_timer_arm(priv, chan);

	return min(rxtx_done, budget - 1);
}

/**
 *  stmmac_tx_timeout
 *  @dev : Pointer to net device structure
 *  @txqueue: the index of the hanging transmit queue
 *  Description: this function is called when a packet transmission fails to
 *   complete within a reasonable time. The driver will mark the error in the
 *   netdev structure and arrange for the device to be reset to a sane state
 *   in order to transmit a new packet.
 */
static void stmmac_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	stmmac_global_err(priv);
}

/**
 *  stmmac_set_rx_mode - entry point for multicast addressing
 *  @dev : pointer to the device structure
 *  Description:
 *  This function is a driver entry point which gets called by the kernel
 *  whenever multicast addresses must be enabled/disabled.
 *  Return value:
 *  void.
 *
 *  FIXME: This may need RXC to be running, but it may be called with BH
 *  disabled, which means we can't call phylink_rx_clk_stop*().
 */
static void stmmac_set_rx_mode(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	stmmac_set_filter(priv, priv->hw, dev);
}

/**
 *  stmmac_change_mtu - entry point to change MTU size for the device.
 *  @dev : device pointer.
 *  @new_mtu : the new MTU size for the device.
 *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
 *  to drive packet transmission. Ethernet has an MTU of 1500 octets
 *  (ETH_DATA_LEN). This value can be changed with ifconfig.
 *  Return value:
 *  0 on success and an appropriate (-)ve integer as defined in errno.h
 *  file on failure.
 */
static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int txfifosz = priv->plat->tx_fifo_size;
	struct stmmac_dma_conf *dma_conf;
	const int mtu = new_mtu;
	int ret;

	if (txfifosz == 0)
		txfifosz = priv->dma_cap.tx_fifo_size;

	txfifosz /= priv->plat->tx_queues_to_use;

	if (stmmac_xdp_is_enabled(priv) && new_mtu > ETH_DATA_LEN) {
		netdev_dbg(priv->dev, "Jumbo frames not supported for XDP\n");
		return -EINVAL;
	}

	new_mtu = STMMAC_ALIGN(new_mtu);

	/* If condition true, FIFO is too small or MTU too large */
	if ((txfifosz < new_mtu) || (new_mtu > BUF_SIZE_16KiB))
		return -EINVAL;

	if (netif_running(dev)) {
		netdev_dbg(priv->dev, "restarting interface to change its MTU\n");
		/* Try to allocate the new DMA conf with the new mtu */
		dma_conf = stmmac_setup_dma_desc(priv, mtu);
		if (IS_ERR(dma_conf)) {
			netdev_err(priv->dev, "failed allocating new dma conf for new MTU %d\n",
				   mtu);
			return PTR_ERR(dma_conf);
		}

		__stmmac_release(dev);

		ret = __stmmac_open(dev, dma_conf);
		if (ret) {
			free_dma_desc_resources(priv, dma_conf);
			kfree(dma_conf);
			netdev_err(priv->dev, "failed reopening the interface after MTU change\n");
			return ret;
		}

		kfree(dma_conf);

		stmmac_set_rx_mode(dev);
	}

	WRITE_ONCE(dev->mtu, mtu);
	netdev_update_features(dev);

	return 0;
}

static netdev_features_t stmmac_fix_features(struct net_device *dev,
					     netdev_features_t features)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	if (priv->plat->rx_coe == STMMAC_RX_COE_NONE)
		features &= ~NETIF_F_RXCSUM;

	if (!priv->plat->tx_coe)
		features &= ~NETIF_F_CSUM_MASK;

	/* Some GMAC devices have a bugged Jumbo frame support that
	 * needs to have the Tx COE disabled for oversized frames
	 * (due to limited buffer sizes). In this case we disable
	 * the TX csum insertion in the TDES and not use SF.
	 */
	if (priv->plat->bugged_jumbo && (dev->mtu > ETH_DATA_LEN))
		features &= ~NETIF_F_CSUM_MASK;

	return features;
}

static int stmmac_set_features(struct net_device *netdev,
			       netdev_features_t features)
{
	struct stmmac_priv *priv = netdev_priv(netdev);

	/* Keep the COE Type in case of csum is supporting */
	if (features & NETIF_F_RXCSUM)
		priv->hw->rx_csum = priv->plat->rx_coe;
	else
		priv->hw->rx_csum = 0;
	/* No check needed because rx_coe has been set before and it will be
	 * fixed in case of issue.
	 */
	stmmac_rx_ipc(priv, priv->hw);

	if (priv->sph_capable) {
		bool sph_en = (priv->hw->rx_csum > 0) && priv->sph_active;
		u8 chan;

		for (chan = 0; chan < priv->plat->rx_queues_to_use; chan++)
			stmmac_enable_sph(priv, priv->ioaddr, sph_en, chan);
	}

	stmmac_set_gso_types(priv, features & NETIF_F_TSO);

	if (features & NETIF_F_HW_VLAN_CTAG_RX)
		priv->hw->hw_vlan_en = true;
	else
		priv->hw->hw_vlan_en = false;

	phylink_rx_clk_stop_block(priv->phylink);
	stmmac_set_hw_vlan_mode(priv, priv->hw);
	phylink_rx_clk_stop_unblock(priv->phylink);

	return 0;
}

static void stmmac_common_interrupt(struct stmmac_priv *priv)
{
	u8 rx_cnt = priv->plat->rx_queues_to_use;
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	u8 queues_count;
	bool xmac;
	u8 queue;

	xmac = dwmac_is_xmac(priv->plat->core_type);
	queues_count = (rx_cnt > tx_cnt) ? rx_cnt : tx_cnt;

	if (priv->irq_wake)
		pm_wakeup_event(priv->device, 0);

	if (priv->dma_cap.estsel)
		stmmac_est_irq_status(priv, priv, priv->dev,
				      &priv->xstats, tx_cnt);

	if (stmmac_fpe_supported(priv))
		stmmac_fpe_irq_status(priv);

	/* To handle GMAC own interrupts */
	if (priv->plat->core_type == DWMAC_CORE_GMAC || xmac) {
		int status = stmmac_host_irq_status(priv, &priv->xstats);

		if (unlikely(status)) {
			/* For LPI we need to save the tx status */
			if (status & CORE_IRQ_TX_PATH_IN_LPI_MODE)
				priv->tx_path_in_lpi_mode = true;
			if (status & CORE_IRQ_TX_PATH_EXIT_LPI_MODE)
				priv->tx_path_in_lpi_mode = false;
		}

		for (queue = 0; queue < queues_count; queue++)
			stmmac_host_mtl_irq_status(priv, priv->hw, queue);

		stmmac_timestamp_interrupt(priv, priv);
	}
}

/**
 *  stmmac_interrupt - main ISR
 *  @irq: interrupt number.
 *  @dev_id: to pass the net device pointer.
 *  Description: this is the main driver interrupt service routine.
 *  It can call:
 *  o DMA service routine (to manage incoming frame reception and transmission
 *    status)
 *  o Core interrupts to manage: remote wake-up, management counter, LPI
 *    interrupts.
 */
static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct stmmac_priv *priv = netdev_priv(dev);

	/* Check if adapter is up */
	if (test_bit(STMMAC_DOWN, &priv->state))
		return IRQ_HANDLED;

	/* Check ASP error if it isn't delivered via an individual IRQ */
	if (priv->sfty_irq <= 0 && stmmac_safety_feat_interrupt(priv))
		return IRQ_HANDLED;

	/* To handle Common interrupts */
	stmmac_common_interrupt(priv);

	/* To handle DMA interrupts */
	stmmac_dma_interrupt(priv);

	return IRQ_HANDLED;
}

static irqreturn_t stmmac_mac_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct stmmac_priv *priv = netdev_priv(dev);

	/* Check if adapter is up */
	if (test_bit(STMMAC_DOWN, &priv->state))
		return IRQ_HANDLED;

	/* To handle Common interrupts */
	stmmac_common_interrupt(priv);

	return IRQ_HANDLED;
}

static irqreturn_t stmmac_safety_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct stmmac_priv *priv = netdev_priv(dev);

	/* Check if adapter is up */
	if (test_bit(STMMAC_DOWN, &priv->state))
		return IRQ_HANDLED;

	/* Check if a fatal error happened */
	stmmac_safety_feat_interrupt(priv);

	return IRQ_HANDLED;
}

static irqreturn_t stmmac_msi_intr_tx(int irq, void *data)
{
	struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)data;
	struct stmmac_dma_conf *dma_conf;
	int chan = tx_q->queue_index;
	struct stmmac_priv *priv;
	int status;

	dma_conf = container_of(tx_q, struct stmmac_dma_conf, tx_queue[chan]);
	priv = container_of(dma_conf, struct stmmac_priv, dma_conf);

	/* Check if adapter is up */
	if (test_bit(STMMAC_DOWN, &priv->state))
		return IRQ_HANDLED;

	status = stmmac_napi_check(priv, chan, DMA_DIR_TX);

	if (unlikely(status & tx_hard_error_bump_tc)) {
		/* Try to bump up the dma threshold on this failure */
		stmmac_bump_dma_threshold(priv, chan);
	} else if (unlikely(status == tx_hard_error)) {
		stmmac_tx_err(priv, chan);
	}

	return IRQ_HANDLED;
}

static irqreturn_t stmmac_msi_intr_rx(int irq, void *data)
{
	struct stmmac_rx_queue *rx_q = (struct stmmac_rx_queue *)data;
	struct stmmac_dma_conf *dma_conf;
	int chan = rx_q->queue_index;
	struct stmmac_priv *priv;

	dma_conf = container_of(rx_q, struct stmmac_dma_conf, rx_queue[chan]);
	priv = container_of(dma_conf, struct stmmac_priv, dma_conf);

	/* Check if adapter is up */
	if (test_bit(STMMAC_DOWN, &priv->state))
		return IRQ_HANDLED;

	stmmac_napi_check(priv, chan, DMA_DIR_RX);

	return IRQ_HANDLED;
}

/**
 *  stmmac_ioctl - Entry point for the Ioctl
 *  @dev: Device pointer.
 *  @rq: An IOCTL specific structure, that can contain a pointer to
 *  a proprietary structure used to pass information to the driver.
 *  @cmd: IOCTL command
 *  Description:
 *  Currently it supports the phy_mii_ioctl(...) and HW time stamping.
 */
static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct stmmac_priv *priv = netdev_priv (dev);
	int ret = -EOPNOTSUPP;

	if (!netif_running(dev))
		return -EINVAL;

	switch (cmd) {
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
		ret = phylink_mii_ioctl(priv->phylink, rq, cmd);
		break;
	default:
		break;
	}

	return ret;
}

static int stmmac_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
				    void *cb_priv)
{
	struct stmmac_priv *priv = cb_priv;
	int ret = -EOPNOTSUPP;

	if (!tc_cls_can_offload_and_chain0(priv->dev, type_data))
		return ret;

	__stmmac_disable_all_queues(priv);

	switch (type) {
	case TC_SETUP_CLSU32:
		ret = stmmac_tc_setup_cls_u32(priv, priv, type_data);
		break;
	case TC_SETUP_CLSFLOWER:
		ret = stmmac_tc_setup_cls(priv, priv, type_data);
		break;
	default:
		break;
	}

	stmmac_enable_all_queues(priv);
	return ret;
}

static LIST_HEAD(stmmac_block_cb_list);

static int stmmac_setup_tc(struct net_device *ndev, enum tc_setup_type type,
			   void *type_data)
{
	struct stmmac_priv *priv = netdev_priv(ndev);

	switch (type) {
	case TC_QUERY_CAPS:
		return stmmac_tc_query_caps(priv, priv, type_data);
	case TC_SETUP_QDISC_MQPRIO:
		return stmmac_tc_setup_mqprio(priv, priv, type_data);
	case TC_SETUP_BLOCK:
		return flow_block_cb_setup_simple(type_data,
						  &stmmac_block_cb_list,
						  stmmac_setup_tc_block_cb,
						  priv, priv, true);
	case TC_SETUP_QDISC_CBS:
		return stmmac_tc_setup_cbs(priv, priv, type_data);
	case TC_SETUP_QDISC_TAPRIO:
		return stmmac_tc_setup_taprio(priv, priv, type_data);
	case TC_SETUP_QDISC_ETF:
		return stmmac_tc_setup_etf(priv, priv, type_data);
	default:
		return -EOPNOTSUPP;
	}
}

static u16 stmmac_select_queue(struct net_device *dev, struct sk_buff *skb,
			       struct net_device *sb_dev)
{
	int gso = skb_shinfo(skb)->gso_type;

	if (gso & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6 | SKB_GSO_UDP_L4)) {
		/*
		 * There is no way to determine the number of TSO/USO
		 * capable Queues. Let's use always the Queue 0
		 * because if TSO/USO is supported then at least this
		 * one will be capable.
		 */
		return 0;
	}

	return netdev_pick_tx(dev, skb, NULL) % dev->real_num_tx_queues;
}

static int stmmac_set_mac_address(struct net_device *ndev, void *addr)
{
	struct stmmac_priv *priv = netdev_priv(ndev);
	int ret = 0;

	ret = pm_runtime_resume_and_get(priv->device);
	if (ret < 0)
		return ret;

	ret = eth_mac_addr(ndev, addr);
	if (ret)
		goto set_mac_error;

	phylink_rx_clk_stop_block(priv->phylink);
	stmmac_set_umac_addr(priv, priv->hw, ndev->dev_addr, 0);
	phylink_rx_clk_stop_unblock(priv->phylink);

set_mac_error:
	pm_runtime_put(priv->device);

	return ret;
}

#ifdef CONFIG_DEBUG_FS
static struct dentry *stmmac_fs_dir;

static void sysfs_display_ring(void *head, int size, int extend_desc,
			       struct seq_file *seq, dma_addr_t dma_phy_addr)
{
	struct dma_extended_desc *ep = (struct dma_extended_desc *)head;
	struct dma_desc *p = (struct dma_desc *)head;
	unsigned int desc_size;
	dma_addr_t dma_addr;
	int i;

	desc_size = extend_desc ? sizeof(*ep) : sizeof(*p);
	for (i = 0; i < size; i++) {
		dma_addr = dma_phy_addr + i * desc_size;
		seq_printf(seq, "%d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
				i, &dma_addr,
				le32_to_cpu(p->des0), le32_to_cpu(p->des1),
				le32_to_cpu(p->des2), le32_to_cpu(p->des3));
		if (extend_desc)
			p = &(++ep)->basic;
		else
			p++;
	}
}

static int stmmac_rings_status_show(struct seq_file *seq, void *v)
{
	struct net_device *dev = seq->private;
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 rx_count = priv->plat->rx_queues_to_use;
	u8 tx_count = priv->plat->tx_queues_to_use;
	u8 queue;

	if ((dev->flags & IFF_UP) == 0)
		return 0;

	for (queue = 0; queue < rx_count; queue++) {
		struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];

		seq_printf(seq, "RX Queue %d:\n", queue);

		if (priv->extend_desc) {
			seq_printf(seq, "Extended descriptor ring:\n");
			sysfs_display_ring((void *)rx_q->dma_erx,
					   priv->dma_conf.dma_rx_size, 1, seq, rx_q->dma_rx_phy);
		} else {
			seq_printf(seq, "Descriptor ring:\n");
			sysfs_display_ring((void *)rx_q->dma_rx,
					   priv->dma_conf.dma_rx_size, 0, seq, rx_q->dma_rx_phy);
		}
	}

	for (queue = 0; queue < tx_count; queue++) {
		struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];

		seq_printf(seq, "TX Queue %d:\n", queue);

		if (priv->extend_desc) {
			seq_printf(seq, "Extended descriptor ring:\n");
			sysfs_display_ring((void *)tx_q->dma_etx,
					   priv->dma_conf.dma_tx_size, 1, seq, tx_q->dma_tx_phy);
		} else if (!(tx_q->tbs & STMMAC_TBS_AVAIL)) {
			seq_printf(seq, "Descriptor ring:\n");
			sysfs_display_ring((void *)tx_q->dma_tx,
					   priv->dma_conf.dma_tx_size, 0, seq, tx_q->dma_tx_phy);
		}
	}

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(stmmac_rings_status);

static int stmmac_dma_cap_show(struct seq_file *seq, void *v)
{
	static const char * const dwxgmac_timestamp_source[] = {
		"None",
		"Internal",
		"External",
		"Both",
	};
	static const char * const dwxgmac_safety_feature_desc[] = {
		"No",
		"All Safety Features with ECC and Parity",
		"All Safety Features without ECC or Parity",
		"All Safety Features with Parity Only",
		"ECC Only",
		"UNDEFINED",
		"UNDEFINED",
		"UNDEFINED",
	};
	struct net_device *dev = seq->private;
	struct stmmac_priv *priv = netdev_priv(dev);

	if (!priv->hw_cap_support) {
		seq_printf(seq, "DMA HW features not supported\n");
		return 0;
	}

	seq_printf(seq, "==============================\n");
	seq_printf(seq, "\tDMA HW features\n");
	seq_printf(seq, "==============================\n");

	seq_printf(seq, "\t10/100 Mbps: %s\n",
		   (priv->dma_cap.mbps_10_100) ? "Y" : "N");
	seq_printf(seq, "\t1000 Mbps: %s\n",
		   (priv->dma_cap.mbps_1000) ? "Y" : "N");
	seq_printf(seq, "\tHalf duplex: %s\n",
		   (priv->dma_cap.half_duplex) ? "Y" : "N");
	if (priv->plat->core_type == DWMAC_CORE_XGMAC) {
		seq_printf(seq,
			   "\tNumber of Additional MAC address registers: %d\n",
			   priv->dma_cap.multi_addr);
	} else {
		seq_printf(seq, "\tHash Filter: %s\n",
			   (priv->dma_cap.hash_filter) ? "Y" : "N");
		seq_printf(seq, "\tMultiple MAC address registers: %s\n",
			   (priv->dma_cap.multi_addr) ? "Y" : "N");
	}
	seq_printf(seq, "\tPCS (TBI/SGMII/RTBI PHY interfaces): %s\n",
		   (priv->dma_cap.pcs) ? "Y" : "N");
	seq_printf(seq, "\tSMA (MDIO) Interface: %s\n",
		   (priv->dma_cap.sma_mdio) ? "Y" : "N");
	seq_printf(seq, "\tPMT Remote wake up: %s\n",
		   (priv->dma_cap.pmt_remote_wake_up) ? "Y" : "N");
	seq_printf(seq, "\tPMT Magic Frame: %s\n",
		   (priv->dma_cap.pmt_magic_frame) ? "Y" : "N");
	seq_printf(seq, "\tRMON module: %s\n",
		   (priv->dma_cap.rmon) ? "Y" : "N");
	seq_printf(seq, "\tIEEE 1588-2002 Time Stamp: %s\n",
		   (priv->dma_cap.time_stamp) ? "Y" : "N");
	seq_printf(seq, "\tIEEE 1588-2008 Advanced Time Stamp: %s\n",
		   (priv->dma_cap.atime_stamp) ? "Y" : "N");
	if (priv->plat->core_type == DWMAC_CORE_XGMAC)
		seq_printf(seq, "\tTimestamp System Time Source: %s\n",
			   dwxgmac_timestamp_source[priv->dma_cap.tssrc]);
	seq_printf(seq, "\t802.3az - Energy-Efficient Ethernet (EEE): %s\n",
		   (priv->dma_cap.eee) ? "Y" : "N");
	seq_printf(seq, "\tAV features: %s\n", (priv->dma_cap.av) ? "Y" : "N");
	seq_printf(seq, "\tChecksum Offload in TX: %s\n",
		   (priv->dma_cap.tx_coe) ? "Y" : "N");
	if (priv->synopsys_id >= DWMAC_CORE_4_00 ||
	    priv->plat->core_type == DWMAC_CORE_XGMAC) {
		seq_printf(seq, "\tIP Checksum Offload in RX: %s\n",
			   (priv->dma_cap.rx_coe) ? "Y" : "N");
	} else {
		seq_printf(seq, "\tIP Checksum Offload (type1) in RX: %s\n",
			   (priv->dma_cap.rx_coe_type1) ? "Y" : "N");
		seq_printf(seq, "\tIP Checksum Offload (type2) in RX: %s\n",
			   (priv->dma_cap.rx_coe_type2) ? "Y" : "N");
		seq_printf(seq, "\tRXFIFO > 2048bytes: %s\n",
			   (priv->dma_cap.rxfifo_over_2048) ? "Y" : "N");
	}
	seq_printf(seq, "\tNumber of Additional RX channel: %d\n",
		   priv->dma_cap.number_rx_channel);
	seq_printf(seq, "\tNumber of Additional TX channel: %d\n",
		   priv->dma_cap.number_tx_channel);
	seq_printf(seq, "\tNumber of Additional RX queues: %u\n",
		   priv->dma_cap.number_rx_queues);
	seq_printf(seq, "\tNumber of Additional TX queues: %u\n",
		   priv->dma_cap.number_tx_queues);
	seq_printf(seq, "\tEnhanced descriptors: %s\n",
		   (priv->dma_cap.enh_desc) ? "Y" : "N");
	seq_printf(seq, "\tTX Fifo Size: %d\n", priv->dma_cap.tx_fifo_size);
	seq_printf(seq, "\tRX Fifo Size: %d\n", priv->dma_cap.rx_fifo_size);
	seq_printf(seq, "\tHash Table Size: %lu\n", priv->dma_cap.hash_tb_sz ?
		   (BIT(priv->dma_cap.hash_tb_sz) << 5) : 0);
	seq_printf(seq, "\tTSO: %s\n", priv->dma_cap.tsoen ? "Y" : "N");
	seq_printf(seq, "\tNumber of PPS Outputs: %d\n",
		   priv->dma_cap.pps_out_num);
	seq_printf(seq, "\tSafety Features: %s\n",
		   dwxgmac_safety_feature_desc[priv->dma_cap.asp]);
	seq_printf(seq, "\tFlexible RX Parser: %s\n",
		   priv->dma_cap.frpsel ? "Y" : "N");
	seq_printf(seq, "\tEnhanced Addressing: %d\n",
		   priv->dma_cap.host_dma_width);
	seq_printf(seq, "\tReceive Side Scaling: %s\n",
		   priv->dma_cap.rssen ? "Y" : "N");
	seq_printf(seq, "\tVLAN Hash Filtering: %s\n",
		   priv->dma_cap.vlhash ? "Y" : "N");
	seq_printf(seq, "\tSplit Header: %s\n",
		   priv->dma_cap.sphen ? "Y" : "N");
	seq_printf(seq, "\tVLAN TX Insertion: %s\n",
		   priv->dma_cap.vlins ? "Y" : "N");
	seq_printf(seq, "\tDouble VLAN: %s\n",
		   priv->dma_cap.dvlan ? "Y" : "N");
	seq_printf(seq, "\tNumber of L3/L4 Filters: %d\n",
		   priv->dma_cap.l3l4fnum);
	seq_printf(seq, "\tARP Offloading: %s\n",
		   priv->dma_cap.arpoffsel ? "Y" : "N");
	seq_printf(seq, "\tEnhancements to Scheduled Traffic (EST): %s\n",
		   priv->dma_cap.estsel ? "Y" : "N");
	seq_printf(seq, "\tFrame Preemption (FPE): %s\n",
		   priv->dma_cap.fpesel ? "Y" : "N");
	seq_printf(seq, "\tTime-Based Scheduling (TBS): %s\n",
		   priv->dma_cap.tbssel ? "Y" : "N");
	seq_printf(seq, "\tNumber of DMA Channels Enabled for TBS: %d\n",
		   priv->dma_cap.tbs_ch_num);
	seq_printf(seq, "\tPer-Stream Filtering: %s\n",
		   priv->dma_cap.sgfsel ? "Y" : "N");
	seq_printf(seq, "\tTX Timestamp FIFO Depth: %lu\n",
		   BIT(priv->dma_cap.ttsfd) >> 1);
	seq_printf(seq, "\tNumber of Traffic Classes: %d\n",
		   priv->dma_cap.numtc);
	seq_printf(seq, "\tDCB Feature: %s\n",
		   priv->dma_cap.dcben ? "Y" : "N");
	seq_printf(seq, "\tIEEE 1588 High Word Register: %s\n",
		   priv->dma_cap.advthword ? "Y" : "N");
	seq_printf(seq, "\tPTP Offload: %s\n",
		   priv->dma_cap.ptoen ? "Y" : "N");
	seq_printf(seq, "\tOne-Step Timestamping: %s\n",
		   priv->dma_cap.osten ? "Y" : "N");
	seq_printf(seq, "\tPriority-Based Flow Control: %s\n",
		   priv->dma_cap.pfcen ? "Y" : "N");
	seq_printf(seq, "\tNumber of Flexible RX Parser Instructions: %lu\n",
		   BIT(priv->dma_cap.frpes) << 6);
	seq_printf(seq, "\tNumber of Flexible RX Parser Parsable Bytes: %lu\n",
		   BIT(priv->dma_cap.frpbs) << 6);
	seq_printf(seq, "\tParallel Instruction Processor Engines: %d\n",
		   priv->dma_cap.frppipe_num);
	seq_printf(seq, "\tNumber of Extended VLAN Tag Filters: %lu\n",
		   priv->dma_cap.nrvf_num ?
		   (BIT(priv->dma_cap.nrvf_num) << 1) : 0);
	seq_printf(seq, "\tWidth of the Time Interval Field in GCL: %d\n",
		   priv->dma_cap.estwid ? 4 * priv->dma_cap.estwid + 12 : 0);
	seq_printf(seq, "\tDepth of GCL: %lu\n",
		   priv->dma_cap.estdep ? (BIT(priv->dma_cap.estdep) << 5) : 0);
	seq_printf(seq, "\tQueue/Channel-Based VLAN Tag Insertion on TX: %s\n",
		   priv->dma_cap.cbtisel ? "Y" : "N");
	seq_printf(seq, "\tNumber of Auxiliary Snapshot Inputs: %d\n",
		   priv->dma_cap.aux_snapshot_n);
	seq_printf(seq, "\tOne-Step Timestamping for PTP over UDP/IP: %s\n",
		   priv->dma_cap.pou_ost_en ? "Y" : "N");
	seq_printf(seq, "\tEnhanced DMA: %s\n",
		   priv->dma_cap.edma ? "Y" : "N");
	seq_printf(seq, "\tDifferent Descriptor Cache: %s\n",
		   priv->dma_cap.ediffc ? "Y" : "N");
	seq_printf(seq, "\tVxLAN/NVGRE: %s\n",
		   priv->dma_cap.vxn ? "Y" : "N");
	seq_printf(seq, "\tDebug Memory Interface: %s\n",
		   priv->dma_cap.dbgmem ? "Y" : "N");
	seq_printf(seq, "\tNumber of Policing Counters: %lu\n",
		   priv->dma_cap.pcsel ? BIT(priv->dma_cap.pcsel + 3) : 0);
	return 0;
}
DEFINE_SHOW_ATTRIBUTE(stmmac_dma_cap);

/* Use network device events to rename debugfs file entries.
 */
static int stmmac_device_event(struct notifier_block *unused,
			       unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct stmmac_priv *priv = netdev_priv(dev);

	if (dev->netdev_ops != &stmmac_netdev_ops)
		goto done;

	switch (event) {
	case NETDEV_CHANGENAME:
		debugfs_change_name(priv->dbgfs_dir, "%s", dev->name);
		break;
	}
done:
	return NOTIFY_DONE;
}

static struct notifier_block stmmac_notifier = {
	.notifier_call = stmmac_device_event,
};

static void stmmac_init_fs(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	rtnl_lock();

	/* Create per netdev entries */
	priv->dbgfs_dir = debugfs_create_dir(dev->name, stmmac_fs_dir);

	/* Entry to report DMA RX/TX rings */
	debugfs_create_file("descriptors_status", 0444, priv->dbgfs_dir, dev,
			    &stmmac_rings_status_fops);

	/* Entry to report the DMA HW features */
	debugfs_create_file("dma_cap", 0444, priv->dbgfs_dir, dev,
			    &stmmac_dma_cap_fops);

	rtnl_unlock();
}

static void stmmac_exit_fs(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	debugfs_remove_recursive(priv->dbgfs_dir);
}
#endif /* CONFIG_DEBUG_FS */

static u32 stmmac_vid_crc32_le(__le16 vid_le)
{
	unsigned char *data = (unsigned char *)&vid_le;
	unsigned char data_byte = 0;
	u32 crc = ~0x0;
	u32 temp = 0;
	int i, bits;

	bits = get_bitmask_order(VLAN_VID_MASK);
	for (i = 0; i < bits; i++) {
		if ((i % 8) == 0)
			data_byte = data[i / 8];

		temp = ((crc & 1) ^ data_byte) & 1;
		crc >>= 1;
		data_byte >>= 1;

		if (temp)
			crc ^= 0xedb88320;
	}

	return crc;
}

static int stmmac_vlan_update(struct stmmac_priv *priv, bool is_double)
{
	u32 crc, hash = 0;
	u16 pmatch = 0;
	int count = 0;
	u16 vid = 0;

	for_each_set_bit(vid, priv->active_vlans, VLAN_N_VID) {
		__le16 vid_le = cpu_to_le16(vid);
		crc = bitrev32(~stmmac_vid_crc32_le(vid_le)) >> 28;
		hash |= (1 << crc);
		count++;
	}

	if (!priv->dma_cap.vlhash) {
		if (count > 2) /* VID = 0 always passes filter */
			return -EOPNOTSUPP;

		pmatch = vid;
		hash = 0;
	}

	if (!netif_running(priv->dev))
		return 0;

	return stmmac_update_vlan_hash(priv, priv->hw, hash, pmatch, is_double);
}

/* FIXME: This may need RXC to be running, but it may be called with BH
 * disabled, which means we can't call phylink_rx_clk_stop*().
 */
static int stmmac_vlan_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
{
	struct stmmac_priv *priv = netdev_priv(ndev);
	unsigned int num_double_vlans;
	bool is_double = false;
	int ret;

	ret = pm_runtime_resume_and_get(priv->device);
	if (ret < 0)
		return ret;

	if (be16_to_cpu(proto) == ETH_P_8021AD)
		is_double = true;

	set_bit(vid, priv->active_vlans);
	num_double_vlans = priv->num_double_vlans + is_double;
	ret = stmmac_vlan_update(priv, num_double_vlans);
	if (ret) {
		clear_bit(vid, priv->active_vlans);
		goto err_pm_put;
	}

	if (priv->hw->num_vlan) {
		ret = stmmac_add_hw_vlan_rx_fltr(priv, ndev, priv->hw, proto, vid);
		if (ret) {
			clear_bit(vid, priv->active_vlans);
			stmmac_vlan_update(priv, priv->num_double_vlans);
			goto err_pm_put;
		}
	}

	priv->num_double_vlans = num_double_vlans;

err_pm_put:
	pm_runtime_put(priv->device);

	return ret;
}

/* FIXME: This may need RXC to be running, but it may be called with BH
 * disabled, which means we can't call phylink_rx_clk_stop*().
 */
static int stmmac_vlan_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
{
	struct stmmac_priv *priv = netdev_priv(ndev);
	unsigned int num_double_vlans;
	bool is_double = false;
	int ret;

	ret = pm_runtime_resume_and_get(priv->device);
	if (ret < 0)
		return ret;

	if (be16_to_cpu(proto) == ETH_P_8021AD)
		is_double = true;

	clear_bit(vid, priv->active_vlans);
	num_double_vlans = priv->num_double_vlans - is_double;
	ret = stmmac_vlan_update(priv, num_double_vlans);
	if (ret) {
		set_bit(vid, priv->active_vlans);
		goto del_vlan_error;
	}

	if (priv->hw->num_vlan) {
		ret = stmmac_del_hw_vlan_rx_fltr(priv, ndev, priv->hw, proto, vid);
		if (ret) {
			set_bit(vid, priv->active_vlans);
			stmmac_vlan_update(priv, priv->num_double_vlans);
			goto del_vlan_error;
		}
	}

	priv->num_double_vlans = num_double_vlans;

del_vlan_error:
	pm_runtime_put(priv->device);

	return ret;
}

static void stmmac_vlan_restore(struct stmmac_priv *priv)
{
	if (!(priv->dev->features & NETIF_F_VLAN_FEATURES))
		return;

	if (priv->hw->num_vlan)
		stmmac_restore_hw_vlan_rx_fltr(priv, priv->dev, priv->hw);

	stmmac_vlan_update(priv, priv->num_double_vlans);
}

static int stmmac_bpf(struct net_device *dev, struct netdev_bpf *bpf)
{
	struct stmmac_priv *priv = netdev_priv(dev);

	switch (bpf->command) {
	case XDP_SETUP_PROG:
		return stmmac_xdp_set_prog(priv, bpf->prog, bpf->extack);
	case XDP_SETUP_XSK_POOL:
		return stmmac_xdp_setup_pool(priv, bpf->xsk.pool,
					     bpf->xsk.queue_id);
	default:
		return -EOPNOTSUPP;
	}
}

static int stmmac_xdp_xmit(struct net_device *dev, int num_frames,
			   struct xdp_frame **frames, u32 flags)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int cpu = smp_processor_id();
	struct netdev_queue *nq;
	int i, nxmit = 0;
	int queue;

	if (unlikely(test_bit(STMMAC_DOWN, &priv->state)))
		return -ENETDOWN;

	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
		return -EINVAL;

	queue = stmmac_xdp_get_tx_queue(priv, cpu);
	nq = netdev_get_tx_queue(priv->dev, queue);

	__netif_tx_lock(nq, cpu);
	/* Avoids TX time-out as we are sharing with slow path */
	txq_trans_cond_update(nq);

	for (i = 0; i < num_frames; i++) {
		int res;

		res = stmmac_xdp_xmit_xdpf(priv, queue, frames[i], true);
		if (res == STMMAC_XDP_CONSUMED)
			break;

		nxmit++;
	}

	if (flags & XDP_XMIT_FLUSH) {
		stmmac_flush_tx_descriptors(priv, queue);
		stmmac_tx_timer_arm(priv, queue);
	}

	__netif_tx_unlock(nq);

	return nxmit;
}

void stmmac_disable_rx_queue(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_channel *ch = &priv->channel[queue];
	unsigned long flags;

	spin_lock_irqsave(&ch->lock, flags);
	stmmac_disable_dma_irq(priv, priv->ioaddr, queue, 1, 0);
	spin_unlock_irqrestore(&ch->lock, flags);

	stmmac_stop_rx_dma(priv, queue);
	__free_dma_rx_desc_resources(priv, &priv->dma_conf, queue);
}

void stmmac_enable_rx_queue(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
	struct stmmac_channel *ch = &priv->channel[queue];
	unsigned long flags;
	int ret;

	ret = __alloc_dma_rx_desc_resources(priv, &priv->dma_conf, queue);
	if (ret) {
		netdev_err(priv->dev, "Failed to alloc RX desc.\n");
		return;
	}

	ret = __init_dma_rx_desc_rings(priv, &priv->dma_conf, queue, GFP_KERNEL);
	if (ret) {
		__free_dma_rx_desc_resources(priv, &priv->dma_conf, queue);
		netdev_err(priv->dev, "Failed to init RX desc.\n");
		return;
	}

	stmmac_reset_rx_queue(priv, queue);
	stmmac_clear_rx_descriptors(priv, &priv->dma_conf, queue);

	stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
			    rx_q->dma_rx_phy, queue);

	stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->buf_alloc_num);

	stmmac_set_queue_rx_buf_size(priv, rx_q, queue);

	stmmac_start_rx_dma(priv, queue);

	spin_lock_irqsave(&ch->lock, flags);
	stmmac_enable_dma_irq(priv, priv->ioaddr, queue, 1, 0);
	spin_unlock_irqrestore(&ch->lock, flags);
}

void stmmac_disable_tx_queue(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_channel *ch = &priv->channel[queue];
	unsigned long flags;

	spin_lock_irqsave(&ch->lock, flags);
	stmmac_disable_dma_irq(priv, priv->ioaddr, queue, 0, 1);
	spin_unlock_irqrestore(&ch->lock, flags);

	stmmac_stop_tx_dma(priv, queue);
	__free_dma_tx_desc_resources(priv, &priv->dma_conf, queue);
}

void stmmac_enable_tx_queue(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
	struct stmmac_channel *ch = &priv->channel[queue];
	unsigned long flags;
	int ret;

	ret = __alloc_dma_tx_desc_resources(priv, &priv->dma_conf, queue);
	if (ret) {
		netdev_err(priv->dev, "Failed to alloc TX desc.\n");
		return;
	}

	ret = __init_dma_tx_desc_rings(priv,  &priv->dma_conf, queue);
	if (ret) {
		__free_dma_tx_desc_resources(priv, &priv->dma_conf, queue);
		netdev_err(priv->dev, "Failed to init TX desc.\n");
		return;
	}

	stmmac_reset_tx_queue(priv, queue);
	stmmac_clear_tx_descriptors(priv, &priv->dma_conf, queue);

	stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
			    tx_q->dma_tx_phy, queue);

	if (tx_q->tbs & STMMAC_TBS_AVAIL)
		stmmac_enable_tbs(priv, priv->ioaddr, 1, queue);

	stmmac_set_queue_tx_tail_ptr(priv, tx_q, queue, 0);

	stmmac_start_tx_dma(priv, queue);

	spin_lock_irqsave(&ch->lock, flags);
	stmmac_enable_dma_irq(priv, priv->ioaddr, queue, 0, 1);
	spin_unlock_irqrestore(&ch->lock, flags);
}

void stmmac_xdp_release(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 chan;

	/* Ensure tx function is not running */
	netif_tx_disable(dev);

	/* Disable NAPI process */
	stmmac_disable_all_queues(priv);

	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);

	/* Free the IRQ lines */
	stmmac_free_irq(dev, REQ_IRQ_ERR_ALL, 0);

	/* Stop TX/RX DMA channels */
	stmmac_stop_all_dma(priv);

	/* Release and free the Rx/Tx resources */
	free_dma_desc_resources(priv, &priv->dma_conf);

	/* Disable the MAC Rx/Tx */
	stmmac_mac_set(priv, priv->ioaddr, false);

	/* set trans_start so we don't get spurious
	 * watchdogs during reset
	 */
	netif_trans_update(dev);
	netif_carrier_off(dev);
}

int stmmac_xdp_open(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 rx_cnt = priv->plat->rx_queues_to_use;
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	u8 dma_csr_ch = max(rx_cnt, tx_cnt);
	struct stmmac_rx_queue *rx_q;
	struct stmmac_tx_queue *tx_q;
	bool sph_en;
	u8 chan;
	int ret;

	ret = alloc_dma_desc_resources(priv, &priv->dma_conf);
	if (ret < 0) {
		netdev_err(dev, "%s: DMA descriptors allocation failed\n",
			   __func__);
		goto dma_desc_error;
	}

	ret = init_dma_desc_rings(dev, &priv->dma_conf, GFP_KERNEL);
	if (ret < 0) {
		netdev_err(dev, "%s: DMA descriptors initialization failed\n",
			   __func__);
		goto init_error;
	}

	stmmac_reset_queues_param(priv);

	/* DMA CSR Channel configuration */
	for (chan = 0; chan < dma_csr_ch; chan++) {
		stmmac_init_chan(priv, priv->ioaddr, priv->plat->dma_cfg, chan);
		stmmac_disable_dma_irq(priv, priv->ioaddr, chan, 1, 1);
	}

	/* Adjust Split header */
	sph_en = (priv->hw->rx_csum > 0) && priv->sph_active;

	/* DMA RX Channel Configuration */
	for (chan = 0; chan < rx_cnt; chan++) {
		rx_q = &priv->dma_conf.rx_queue[chan];

		stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
				    rx_q->dma_rx_phy, chan);

		stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan,
					     rx_q->buf_alloc_num);

		stmmac_set_queue_rx_buf_size(priv, rx_q, chan);

		stmmac_enable_sph(priv, priv->ioaddr, sph_en, chan);
	}

	/* DMA TX Channel Configuration */
	for (chan = 0; chan < tx_cnt; chan++) {
		tx_q = &priv->dma_conf.tx_queue[chan];

		stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
				    tx_q->dma_tx_phy, chan);

		stmmac_set_queue_tx_tail_ptr(priv, tx_q, chan, 0);

		hrtimer_setup(&tx_q->txtimer, stmmac_tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	}

	/* Enable the MAC Rx/Tx */
	stmmac_mac_set(priv, priv->ioaddr, true);

	/* Start Rx & Tx DMA Channels */
	stmmac_start_all_dma(priv);

	ret = stmmac_request_irq(dev);
	if (ret)
		goto irq_error;

	/* Enable NAPI process*/
	stmmac_enable_all_queues(priv);
	netif_carrier_on(dev);
	netif_tx_start_all_queues(dev);
	stmmac_enable_all_dma_irq(priv);

	return 0;

irq_error:
	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);

init_error:
	free_dma_desc_resources(priv, &priv->dma_conf);
dma_desc_error:
	return ret;
}

int stmmac_xsk_wakeup(struct net_device *dev, u32 queue, u32 flags)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	struct stmmac_rx_queue *rx_q;
	struct stmmac_tx_queue *tx_q;
	struct stmmac_channel *ch;

	if (test_bit(STMMAC_DOWN, &priv->state) ||
	    !netif_carrier_ok(priv->dev))
		return -ENETDOWN;

	if (!stmmac_xdp_is_enabled(priv))
		return -EINVAL;

	if (queue >= priv->plat->rx_queues_to_use ||
	    queue >= priv->plat->tx_queues_to_use)
		return -EINVAL;

	rx_q = &priv->dma_conf.rx_queue[queue];
	tx_q = &priv->dma_conf.tx_queue[queue];
	ch = &priv->channel[queue];

	if (!rx_q->xsk_pool && !tx_q->xsk_pool)
		return -EINVAL;

	if (!napi_if_scheduled_mark_missed(&ch->rxtx_napi)) {
		/* EQoS does not have per-DMA channel SW interrupt,
		 * so we schedule RX Napi straight-away.
		 */
		if (likely(napi_schedule_prep(&ch->rxtx_napi)))
			__napi_schedule(&ch->rxtx_napi);
	}

	return 0;
}

static void stmmac_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	u8 rx_cnt = priv->plat->rx_queues_to_use;
	unsigned int start;
	u8 q;

	for (q = 0; q < tx_cnt; q++) {
		struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[q];
		u64 tx_packets;
		u64 tx_bytes;

		do {
			start = u64_stats_fetch_begin(&txq_stats->q_syncp);
			tx_bytes   = u64_stats_read(&txq_stats->q.tx_bytes);
		} while (u64_stats_fetch_retry(&txq_stats->q_syncp, start));
		do {
			start = u64_stats_fetch_begin(&txq_stats->napi_syncp);
			tx_packets = u64_stats_read(&txq_stats->napi.tx_packets);
		} while (u64_stats_fetch_retry(&txq_stats->napi_syncp, start));

		stats->tx_packets += tx_packets;
		stats->tx_bytes += tx_bytes;
	}

	for (q = 0; q < rx_cnt; q++) {
		struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[q];
		u64 rx_packets;
		u64 rx_bytes;

		do {
			start = u64_stats_fetch_begin(&rxq_stats->napi_syncp);
			rx_packets = u64_stats_read(&rxq_stats->napi.rx_packets);
			rx_bytes   = u64_stats_read(&rxq_stats->napi.rx_bytes);
		} while (u64_stats_fetch_retry(&rxq_stats->napi_syncp, start));

		stats->rx_packets += rx_packets;
		stats->rx_bytes += rx_bytes;
	}

	stats->rx_dropped = priv->xstats.rx_dropped;
	stats->rx_errors = priv->xstats.rx_errors;
	stats->tx_dropped = priv->xstats.tx_dropped;
	stats->tx_errors = priv->xstats.tx_errors;
	stats->tx_carrier_errors = priv->xstats.tx_losscarrier + priv->xstats.tx_carrier;
	stats->collisions = priv->xstats.tx_collision + priv->xstats.rx_collision;
	stats->rx_length_errors = priv->xstats.rx_length;
	stats->rx_crc_errors = priv->xstats.rx_crc_errors;
	stats->rx_over_errors = priv->xstats.rx_overflow_cntr;
	stats->rx_missed_errors = priv->xstats.rx_missed_cntr;
}

static const struct net_device_ops stmmac_netdev_ops = {
	.ndo_open = stmmac_open,
	.ndo_start_xmit = stmmac_xmit,
	.ndo_features_check = stmmac_features_check,
	.ndo_stop = stmmac_release,
	.ndo_change_mtu = stmmac_change_mtu,
	.ndo_fix_features = stmmac_fix_features,
	.ndo_set_features = stmmac_set_features,
	.ndo_set_rx_mode = stmmac_set_rx_mode,
	.ndo_tx_timeout = stmmac_tx_timeout,
	.ndo_eth_ioctl = stmmac_ioctl,
	.ndo_get_stats64 = stmmac_get_stats64,
	.ndo_setup_tc = stmmac_setup_tc,
	.ndo_select_queue = stmmac_select_queue,
	.ndo_set_mac_address = stmmac_set_mac_address,
	.ndo_vlan_rx_add_vid = stmmac_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid = stmmac_vlan_rx_kill_vid,
	.ndo_bpf = stmmac_bpf,
	.ndo_xdp_xmit = stmmac_xdp_xmit,
	.ndo_xsk_wakeup = stmmac_xsk_wakeup,
	.ndo_hwtstamp_get = stmmac_hwtstamp_get,
	.ndo_hwtstamp_set = stmmac_hwtstamp_set,
};

static void stmmac_reset_subtask(struct stmmac_priv *priv)
{
	if (!test_and_clear_bit(STMMAC_RESET_REQUESTED, &priv->state))
		return;
	if (test_bit(STMMAC_DOWN, &priv->state))
		return;

	netdev_err(priv->dev, "Reset adapter.\n");

	rtnl_lock();
	netif_trans_update(priv->dev);
	while (test_and_set_bit(STMMAC_RESETING, &priv->state))
		usleep_range(1000, 2000);

	set_bit(STMMAC_DOWN, &priv->state);
	dev_close(priv->dev);
	dev_open(priv->dev, NULL);
	clear_bit(STMMAC_DOWN, &priv->state);
	clear_bit(STMMAC_RESETING, &priv->state);
	rtnl_unlock();
}

static void stmmac_service_task(struct work_struct *work)
{
	struct stmmac_priv *priv = container_of(work, struct stmmac_priv,
			service_task);

	stmmac_reset_subtask(priv);
	clear_bit(STMMAC_SERVICE_SCHED, &priv->state);
}

static void stmmac_print_actphyif(struct stmmac_priv *priv)
{
	const char **phyif_table;
	const char *actphyif_str;
	size_t phyif_table_size;

	switch (priv->plat->core_type) {
	case DWMAC_CORE_MAC100:
		return;

	case DWMAC_CORE_GMAC:
	case DWMAC_CORE_GMAC4:
		phyif_table = stmmac_dwmac_actphyif;
		phyif_table_size = ARRAY_SIZE(stmmac_dwmac_actphyif);
		break;

	case DWMAC_CORE_XGMAC:
		phyif_table = stmmac_dwxgmac_phyif;
		phyif_table_size = ARRAY_SIZE(stmmac_dwxgmac_phyif);
		break;
	}

	if (priv->dma_cap.actphyif < phyif_table_size)
		actphyif_str = phyif_table[priv->dma_cap.actphyif];
	else
		actphyif_str = NULL;

	if (!actphyif_str)
		actphyif_str = "unknown";

	dev_info(priv->device, "Active PHY interface: %s (%u)\n",
		 actphyif_str, priv->dma_cap.actphyif);
}

/**
 *  stmmac_hw_init - Init the MAC device
 *  @priv: driver private structure
 *  Description: this function is to configure the MAC device according to
 *  some platform parameters or the HW capability register. It prepares the
 *  driver to use either ring or chain modes and to setup either enhanced or
 *  normal descriptors.
 */
static int stmmac_hw_init(struct stmmac_priv *priv)
{
	int ret;

	/* dwmac-sun8i only work in chain mode */
	if (priv->plat->flags & STMMAC_FLAG_HAS_SUN8I)
		chain_mode = 1;
	priv->chain_mode = !!chain_mode;

	/* Initialize HW Interface */
	ret = stmmac_hwif_init(priv);
	if (ret)
		return ret;

	/* Get the HW capability (new GMAC newer than 3.50a) */
	priv->hw_cap_support = stmmac_get_hw_features(priv);
	if (priv->hw_cap_support) {
		dev_info(priv->device, "DMA HW capability register supported\n");

		/* We can override some gmac/dma configuration fields: e.g.
		 * enh_desc, tx_coe (e.g. that are passed through the
		 * platform) with the values from the HW capability
		 * register (if supported).
		 */
		priv->plat->enh_desc = priv->dma_cap.enh_desc;
		priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up &&
				!(priv->plat->flags & STMMAC_FLAG_USE_PHY_WOL);
		if (priv->dma_cap.hash_tb_sz) {
			priv->hw->multicast_filter_bins =
					(BIT(priv->dma_cap.hash_tb_sz) << 5);
			priv->hw->mcast_bits_log2 =
					ilog2(priv->hw->multicast_filter_bins);
		}

		/* TXCOE doesn't work in thresh DMA mode */
		if (priv->plat->force_thresh_dma_mode)
			priv->plat->tx_coe = false;
		else
			priv->plat->tx_coe = priv->dma_cap.tx_coe;

		/* In case of GMAC4 rx_coe is from HW cap register. */
		priv->plat->rx_coe = priv->dma_cap.rx_coe;

		if (priv->dma_cap.rx_coe_type2)
			priv->plat->rx_coe = STMMAC_RX_COE_TYPE2;
		else if (priv->dma_cap.rx_coe_type1)
			priv->plat->rx_coe = STMMAC_RX_COE_TYPE1;

		stmmac_print_actphyif(priv);
	} else {
		dev_info(priv->device, "No HW DMA feature register supported\n");
	}

	if (priv->plat->rx_coe) {
		priv->hw->rx_csum = priv->plat->rx_coe;
		dev_info(priv->device, "RX Checksum Offload Engine supported\n");
		if (priv->synopsys_id < DWMAC_CORE_4_00)
			dev_info(priv->device, "COE Type %d\n", priv->hw->rx_csum);
	}
	if (priv->plat->tx_coe)
		dev_info(priv->device, "TX Checksum insertion supported\n");

	if (priv->plat->pmt) {
		dev_info(priv->device, "Wake-Up On Lan supported\n");
		device_set_wakeup_capable(priv->device, 1);
		devm_pm_set_wake_irq(priv->device, priv->wol_irq);
	}

	if (priv->dma_cap.number_rx_queues &&
	    priv->plat->rx_queues_to_use > priv->dma_cap.number_rx_queues) {
		dev_warn(priv->device,
			 "Number of Rx queues (%u) exceeds dma capability\n",
			 priv->plat->rx_queues_to_use);
		priv->plat->rx_queues_to_use = priv->dma_cap.number_rx_queues;
	}
	if (priv->dma_cap.number_tx_queues &&
	    priv->plat->tx_queues_to_use > priv->dma_cap.number_tx_queues) {
		dev_warn(priv->device,
			 "Number of Tx queues (%u) exceeds dma capability\n",
			 priv->plat->tx_queues_to_use);
		priv->plat->tx_queues_to_use = priv->dma_cap.number_tx_queues;
	}

	if (priv->dma_cap.rx_fifo_size &&
	    priv->plat->rx_fifo_size > priv->dma_cap.rx_fifo_size) {
		dev_warn(priv->device,
			 "Rx FIFO size (%u) exceeds dma capability\n",
			 priv->plat->rx_fifo_size);
		priv->plat->rx_fifo_size = priv->dma_cap.rx_fifo_size;
	}
	if (priv->dma_cap.tx_fifo_size &&
	    priv->plat->tx_fifo_size > priv->dma_cap.tx_fifo_size) {
		dev_warn(priv->device,
			 "Tx FIFO size (%u) exceeds dma capability\n",
			 priv->plat->tx_fifo_size);
		priv->plat->tx_fifo_size = priv->dma_cap.tx_fifo_size;
	}

	priv->hw->vlan_fail_q_en =
		(priv->plat->flags & STMMAC_FLAG_VLAN_FAIL_Q_EN);
	priv->hw->vlan_fail_q = priv->plat->vlan_fail_q;

	/* Run HW quirks, if any */
	if (priv->hwif_quirks) {
		ret = priv->hwif_quirks(priv);
		if (ret)
			return ret;
	}

	/* Set alternate descriptor size (which tells the hardware that
	 * descriptors are 8 32-bit words) when using extended descriptors
	 * with ring mode. Only applicable for pre-v4.0 cores. Platform glue
	 * is not expected to change this.
	 */
	priv->plat->dma_cfg->atds = priv->extend_desc &&
				    priv->descriptor_mode == STMMAC_RING_MODE;

	/* Rx Watchdog is available in the COREs newer than the 3.40.
	 * In some case, for example on bugged HW this feature
	 * has to be disable and this can be done by passing the
	 * riwt_off field from the platform.
	 */
	if ((priv->synopsys_id >= DWMAC_CORE_3_50 ||
	     priv->plat->core_type == DWMAC_CORE_XGMAC) &&
	    !priv->plat->riwt_off) {
		priv->use_riwt = 1;
		dev_info(priv->device,
			 "Enable RX Mitigation via HW Watchdog Timer\n");
	}

	/* Unimplemented PCS init (as indicated by stmmac_do_callback()
	 * perversely returning -EINVAL) is non-fatal.
	 */
	ret = stmmac_mac_pcs_init(priv);
	if (ret != -EINVAL)
		return ret;

	return 0;
}

static void stmmac_napi_add(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 queue, maxq;

	maxq = max(priv->plat->rx_queues_to_use, priv->plat->tx_queues_to_use);

	for (queue = 0; queue < maxq; queue++) {
		struct stmmac_channel *ch = &priv->channel[queue];

		ch->priv_data = priv;
		ch->index = queue;
		spin_lock_init(&ch->lock);

		if (queue < priv->plat->rx_queues_to_use) {
			netif_napi_add(dev, &ch->rx_napi, stmmac_napi_poll_rx);
		}
		if (queue < priv->plat->tx_queues_to_use) {
			netif_napi_add_tx(dev, &ch->tx_napi,
					  stmmac_napi_poll_tx);
		}
		if (queue < priv->plat->rx_queues_to_use &&
		    queue < priv->plat->tx_queues_to_use) {
			netif_napi_add(dev, &ch->rxtx_napi,
				       stmmac_napi_poll_rxtx);
		}
	}
}

static void stmmac_napi_del(struct net_device *dev)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	u8 queue, maxq;

	maxq = max(priv->plat->rx_queues_to_use, priv->plat->tx_queues_to_use);

	for (queue = 0; queue < maxq; queue++) {
		struct stmmac_channel *ch = &priv->channel[queue];

		if (queue < priv->plat->rx_queues_to_use)
			netif_napi_del(&ch->rx_napi);
		if (queue < priv->plat->tx_queues_to_use)
			netif_napi_del(&ch->tx_napi);
		if (queue < priv->plat->rx_queues_to_use &&
		    queue < priv->plat->tx_queues_to_use) {
			netif_napi_del(&ch->rxtx_napi);
		}
	}
}

int stmmac_reinit_queues(struct net_device *dev, u8 rx_cnt, u8 tx_cnt)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int ret = 0, i;

	if (netif_running(dev))
		stmmac_release(dev);

	stmmac_napi_del(dev);

	priv->plat->rx_queues_to_use = rx_cnt;
	priv->plat->tx_queues_to_use = tx_cnt;
	if (!netif_is_rxfh_configured(dev))
		for (i = 0; i < ARRAY_SIZE(priv->rss.table); i++)
			priv->rss.table[i] = ethtool_rxfh_indir_default(i,
									rx_cnt);

	stmmac_napi_add(dev);

	if (netif_running(dev))
		ret = stmmac_open(dev);

	return ret;
}

int stmmac_reinit_ringparam(struct net_device *dev, u32 rx_size, u32 tx_size)
{
	struct stmmac_priv *priv = netdev_priv(dev);
	int ret = 0;

	if (netif_running(dev))
		stmmac_release(dev);

	priv->dma_conf.dma_rx_size = rx_size;
	priv->dma_conf.dma_tx_size = tx_size;

	if (netif_running(dev))
		ret = stmmac_open(dev);

	return ret;
}

static int stmmac_xdp_rx_timestamp(const struct xdp_md *_ctx, u64 *timestamp)
{
	const struct stmmac_xdp_buff *ctx = (void *)_ctx;
	struct dma_desc *desc_contains_ts = ctx->desc;
	struct stmmac_priv *priv = ctx->priv;
	struct dma_desc *ndesc = ctx->ndesc;
	struct dma_desc *desc = ctx->desc;
	u64 ns = 0;

	if (!priv->hwts_rx_en)
		return -ENODATA;

	/* For GMAC4, the valid timestamp is from CTX next desc. */
	if (dwmac_is_xmac(priv->plat->core_type))
		desc_contains_ts = ndesc;

	/* Check if timestamp is available */
	if (stmmac_get_rx_timestamp_status(priv, desc, ndesc, priv->adv_ts)) {
		stmmac_get_timestamp(priv, desc_contains_ts, priv->adv_ts, &ns);
		ns -= priv->plat->cdc_error_adj;
		*timestamp = ns_to_ktime(ns);
		return 0;
	}

	return -ENODATA;
}

static const struct xdp_metadata_ops stmmac_xdp_metadata_ops = {
	.xmo_rx_timestamp		= stmmac_xdp_rx_timestamp,
};

static int stmmac_dl_ts_coarse_set(struct devlink *dl, u32 id,
				   struct devlink_param_gset_ctx *ctx,
				   struct netlink_ext_ack *extack)
{
	struct stmmac_devlink_priv *dl_priv = devlink_priv(dl);
	struct stmmac_priv *priv = dl_priv->stmmac_priv;

	priv->tsfupdt_coarse = ctx->val.vbool;

	if (priv->tsfupdt_coarse)
		priv->systime_flags &= ~PTP_TCR_TSCFUPDT;
	else
		priv->systime_flags |= PTP_TCR_TSCFUPDT;

	/* In Coarse mode, we can use a smaller subsecond increment, let's
	 * reconfigure the systime, subsecond increment and addend.
	 */
	stmmac_update_subsecond_increment(priv);

	return 0;
}

static int stmmac_dl_ts_coarse_get(struct devlink *dl, u32 id,
				   struct devlink_param_gset_ctx *ctx,
				   struct netlink_ext_ack *extack)
{
	struct stmmac_devlink_priv *dl_priv = devlink_priv(dl);
	struct stmmac_priv *priv = dl_priv->stmmac_priv;

	ctx->val.vbool = priv->tsfupdt_coarse;

	return 0;
}

static const struct devlink_param stmmac_devlink_params[] = {
	DEVLINK_PARAM_DRIVER(STMMAC_DEVLINK_PARAM_ID_TS_COARSE, "phc_coarse_adj",
			     DEVLINK_PARAM_TYPE_BOOL,
			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
			     stmmac_dl_ts_coarse_get,
			     stmmac_dl_ts_coarse_set, NULL),
};

/* None of the generic devlink parameters are implemented */
static const struct devlink_ops stmmac_devlink_ops = {};

static int stmmac_register_devlink(struct stmmac_priv *priv)
{
	struct stmmac_devlink_priv *dl_priv;
	int ret;

	/* For now, what is exposed over devlink is only relevant when
	 * timestamping is available and we have a valid ptp clock rate
	 */
	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp) ||
	    !priv->plat->clk_ptp_rate)
		return 0;

	priv->devlink = devlink_alloc(&stmmac_devlink_ops, sizeof(*dl_priv),
				      priv->device);
	if (!priv->devlink)
		return -ENOMEM;

	dl_priv = devlink_priv(priv->devlink);
	dl_priv->stmmac_priv = priv;

	ret = devlink_params_register(priv->devlink, stmmac_devlink_params,
				      ARRAY_SIZE(stmmac_devlink_params));
	if (ret)
		goto dl_free;

	devlink_register(priv->devlink);
	return 0;

dl_free:
	devlink_free(priv->devlink);

	return ret;
}

static void stmmac_unregister_devlink(struct stmmac_priv *priv)
{
	if (!priv->devlink)
		return;

	devlink_unregister(priv->devlink);
	devlink_params_unregister(priv->devlink, stmmac_devlink_params,
				  ARRAY_SIZE(stmmac_devlink_params));
	devlink_free(priv->devlink);
}

struct plat_stmmacenet_data *stmmac_plat_dat_alloc(struct device *dev)
{
	struct plat_stmmacenet_data *plat_dat;
	int i;

	plat_dat = devm_kzalloc(dev, sizeof(*plat_dat), GFP_KERNEL);
	if (!plat_dat)
		return NULL;

	plat_dat->dma_cfg = &plat_dat->__dma_cfg;

	/* Set the defaults:
	 * - phy autodetection
	 * - determine GMII_Address CR field from CSR clock
	 * - allow MTU up to JUMBO_LEN
	 * - hash table size
	 * - one unicast filter entry
	 */
	plat_dat->phy_addr = -1;
	plat_dat->clk_csr = -1;
	plat_dat->maxmtu = JUMBO_LEN;
	plat_dat->multicast_filter_bins = HASH_TABLE_SIZE;
	plat_dat->unicast_filter_entries = 1;

	/* Set the mtl defaults */
	plat_dat->tx_queues_to_use = 1;
	plat_dat->rx_queues_to_use = 1;

	/* Setup the default RX queue channel map */
	for (i = 0; i < ARRAY_SIZE(plat_dat->rx_queues_cfg); i++)
		plat_dat->rx_queues_cfg[i].chan = i;

	return plat_dat;
}
EXPORT_SYMBOL_GPL(stmmac_plat_dat_alloc);

static int __stmmac_dvr_probe(struct device *device,
			      struct plat_stmmacenet_data *plat_dat,
			      struct stmmac_resources *res)
{
	struct net_device *ndev = NULL;
	struct stmmac_priv *priv;
	int i, ret = 0;
	u8 rxq;

	if (!plat_dat->dma_cfg || !plat_dat->dma_cfg->pbl) {
		dev_err(device, "invalid DMA configuration\n");
		return -EINVAL;
	}

	ndev = devm_alloc_etherdev_mqs(device, sizeof(struct stmmac_priv),
				       MTL_MAX_TX_QUEUES, MTL_MAX_RX_QUEUES);
	if (!ndev)
		return -ENOMEM;

	SET_NETDEV_DEV(ndev, device);

	priv = netdev_priv(ndev);
	priv->device = device;
	priv->dev = ndev;

	for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
		u64_stats_init(&priv->xstats.rxq_stats[i].napi_syncp);
	for (i = 0; i < MTL_MAX_TX_QUEUES; i++) {
		u64_stats_init(&priv->xstats.txq_stats[i].q_syncp);
		u64_stats_init(&priv->xstats.txq_stats[i].napi_syncp);
	}

	priv->xstats.pcpu_stats =
		devm_netdev_alloc_pcpu_stats(device, struct stmmac_pcpu_stats);
	if (!priv->xstats.pcpu_stats)
		return -ENOMEM;

	stmmac_set_ethtool_ops(ndev);
	priv->pause_time = pause;
	priv->plat = plat_dat;
	priv->ioaddr = res->addr;
	priv->dev->base_addr = (unsigned long)res->addr;
	priv->plat->dma_cfg->multi_msi_en =
		(priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN);

	priv->dev->irq = res->irq;
	priv->wol_irq = res->wol_irq;
	priv->sfty_irq = res->sfty_irq;

	if (priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN) {
		ret = stmmac_msi_init(priv, res);
		if (ret)
			return ret;
	}

	if (!is_zero_ether_addr(res->mac))
		eth_hw_addr_set(priv->dev, res->mac);

	dev_set_drvdata(device, priv->dev);

	/* Verify driver arguments */
	stmmac_verify_args();

	priv->af_xdp_zc_qps = bitmap_zalloc(MTL_MAX_TX_QUEUES, GFP_KERNEL);
	if (!priv->af_xdp_zc_qps)
		return -ENOMEM;

	/* Allocate workqueue */
	priv->wq = create_singlethread_workqueue("stmmac_wq");
	if (!priv->wq) {
		dev_err(priv->device, "failed to create workqueue\n");
		ret = -ENOMEM;
		goto error_wq_init;
	}

	INIT_WORK(&priv->service_task, stmmac_service_task);

	timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);

	/* Override with kernel parameters if supplied XXX CRS XXX
	 * this needs to have multiple instances
	 */
	if ((phyaddr >= 0) && (phyaddr <= 31))
		priv->plat->phy_addr = phyaddr;

	if (priv->plat->stmmac_rst) {
		ret = reset_control_assert(priv->plat->stmmac_rst);
		reset_control_deassert(priv->plat->stmmac_rst);
		/* Some reset controllers have only reset callback instead of
		 * assert + deassert callbacks pair.
		 */
		if (ret == -ENOTSUPP)
			reset_control_reset(priv->plat->stmmac_rst);
	}

	ret = reset_control_deassert(priv->plat->stmmac_ahb_rst);
	if (ret == -ENOTSUPP)
		dev_err(priv->device, "unable to bring out of ahb reset: %pe\n",
			ERR_PTR(ret));

	/* Wait a bit for the reset to take effect */
	udelay(10);

	/* Init MAC and get the capabilities */
	ret = stmmac_hw_init(priv);
	if (ret)
		goto error_hw_init;

	/* Only DWMAC core version 5.20 onwards supports HW descriptor prefetch.
	 */
	if (priv->synopsys_id < DWMAC_CORE_5_20)
		priv->plat->dma_cfg->dche = false;

	stmmac_check_ether_addr(priv);

	ndev->netdev_ops = &stmmac_netdev_ops;

	ndev->xdp_metadata_ops = &stmmac_xdp_metadata_ops;
	ndev->xsk_tx_metadata_ops = &stmmac_xsk_tx_metadata_ops;

	ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
			    NETIF_F_RXCSUM;
	ndev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
			     NETDEV_XDP_ACT_XSK_ZEROCOPY;

	ret = stmmac_tc_init(priv, priv);
	if (!ret) {
		ndev->hw_features |= NETIF_F_HW_TC;
	}

	stmmac_set_gso_features(ndev);

	if (priv->dma_cap.sphen &&
	    !(priv->plat->flags & STMMAC_FLAG_SPH_DISABLE)) {
		ndev->hw_features |= NETIF_F_GRO;
		priv->sph_capable = true;
		priv->sph_active = priv->sph_capable;
		dev_info(priv->device, "SPH feature enabled\n");
	}

	/* Ideally our host DMA address width is the same as for the
	 * device. However, it may differ and then we have to use our
	 * host DMA width for allocation and the device DMA width for
	 * register handling.
	 */
	if (priv->plat->host_dma_width)
		priv->dma_cap.host_dma_width = priv->plat->host_dma_width;
	else
		priv->dma_cap.host_dma_width = priv->dma_cap.addr64;

	if (priv->dma_cap.host_dma_width) {
		ret = dma_set_mask_and_coherent(device,
				DMA_BIT_MASK(priv->dma_cap.host_dma_width));
		if (!ret) {
			dev_info(priv->device, "Using %d/%d bits DMA host/device width\n",
				 priv->dma_cap.host_dma_width, priv->dma_cap.addr64);

			/*
			 * If more than 32 bits can be addressed, make sure to
			 * enable enhanced addressing mode.
			 */
			if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT))
				priv->plat->dma_cfg->eame = true;
		} else {
			ret = dma_set_mask_and_coherent(device, DMA_BIT_MASK(32));
			if (ret) {
				dev_err(priv->device, "Failed to set DMA Mask\n");
				goto error_hw_init;
			}

			priv->dma_cap.host_dma_width = 32;
		}
	}

	ndev->features |= ndev->hw_features | NETIF_F_HIGHDMA;
	ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
#ifdef STMMAC_VLAN_TAG_USED
	/* Both mac100 and gmac support receive VLAN tag detection */
	ndev->features |= NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_HW_VLAN_STAG_RX;
	if (dwmac_is_xmac(priv->plat->core_type)) {
		ndev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
		priv->hw->hw_vlan_en = true;
	}
	if (priv->dma_cap.vlhash) {
		ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
		ndev->features |= NETIF_F_HW_VLAN_STAG_FILTER;
	}
	if (priv->dma_cap.vlins)
		ndev->features |= NETIF_F_HW_VLAN_CTAG_TX;
#endif
	priv->msg_enable = netif_msg_init(debug, default_msg_level);

	priv->xstats.threshold = tc;

	/* Initialize RSS */
	rxq = priv->plat->rx_queues_to_use;
	netdev_rss_key_fill(priv->rss.key, sizeof(priv->rss.key));
	for (i = 0; i < ARRAY_SIZE(priv->rss.table); i++)
		priv->rss.table[i] = ethtool_rxfh_indir_default(i, rxq);

	if (priv->dma_cap.rssen && priv->plat->rss_en)
		ndev->features |= NETIF_F_RXHASH;

	ndev->vlan_features |= ndev->features;

	/* MTU range: 46 - hw-specific max */
	ndev->min_mtu = ETH_ZLEN - ETH_HLEN;

	if (priv->plat->core_type == DWMAC_CORE_XGMAC)
		ndev->max_mtu = XGMAC_JUMBO_LEN;
	else if (priv->plat->enh_desc || priv->synopsys_id >= DWMAC_CORE_4_00)
		ndev->max_mtu = JUMBO_LEN;
	else
		ndev->max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);

	/* Warn if the platform's maxmtu is smaller than the minimum MTU,
	 * otherwise clamp the maximum MTU above to the platform's maxmtu.
	 */
	if (priv->plat->maxmtu < ndev->min_mtu)
		dev_warn(priv->device,
			 "%s: warning: maxmtu having invalid value (%d)\n",
			 __func__, priv->plat->maxmtu);
	else if (priv->plat->maxmtu < ndev->max_mtu)
		ndev->max_mtu = priv->plat->maxmtu;

	ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;

	/* Setup channels NAPI */
	stmmac_napi_add(ndev);

	mutex_init(&priv->lock);

	stmmac_fpe_init(priv);

	stmmac_check_pcs_mode(priv);

	pm_runtime_get_noresume(device);
	pm_runtime_set_active(device);
	if (!pm_runtime_enabled(device))
		pm_runtime_enable(device);

	ret = stmmac_mdio_register(ndev);
	if (ret < 0) {
		dev_err_probe(priv->device, ret,
			      "MDIO bus (id: %d) registration failed\n",
			      priv->plat->bus_id);
		goto error_mdio_register;
	}

	ret = stmmac_pcs_setup(ndev);
	if (ret)
		goto error_pcs_setup;

	ret = stmmac_phylink_setup(priv);
	if (ret) {
		netdev_err(ndev, "failed to setup phy (%d)\n", ret);
		goto error_phy_setup;
	}

	ret = stmmac_register_devlink(priv);
	if (ret)
		goto error_devlink_setup;

	ret = register_netdev(ndev);
	if (ret) {
		dev_err(priv->device, "%s: ERROR %i registering the device\n",
			__func__, ret);
		goto error_netdev_register;
	}

#ifdef CONFIG_DEBUG_FS
	stmmac_init_fs(ndev);
#endif

	if (priv->plat->dump_debug_regs)
		priv->plat->dump_debug_regs(priv->plat->bsp_priv);

	/* Let pm_runtime_put() disable the clocks.
	 * If CONFIG_PM is not enabled, the clocks will stay powered.
	 */
	pm_runtime_put(device);

	return ret;

error_netdev_register:
	stmmac_unregister_devlink(priv);
error_devlink_setup:
	phylink_destroy(priv->phylink);
error_phy_setup:
	stmmac_pcs_clean(ndev);
error_pcs_setup:
	stmmac_mdio_unregister(ndev);
error_mdio_register:
	stmmac_napi_del(ndev);
error_hw_init:
	destroy_workqueue(priv->wq);
error_wq_init:
	bitmap_free(priv->af_xdp_zc_qps);

	return ret;
}

/**
 * stmmac_dvr_probe
 * @dev: device pointer
 * @plat_dat: platform data pointer
 * @res: stmmac resource pointer
 * Description: this is the main probe function used to
 * call the alloc_etherdev, allocate the priv structure.
 * Return:
 * returns 0 on success, otherwise errno.
 */
int stmmac_dvr_probe(struct device *dev, struct plat_stmmacenet_data *plat_dat,
		     struct stmmac_resources *res)
{
	int ret;

	if (plat_dat->init) {
		ret = plat_dat->init(dev, plat_dat->bsp_priv);
		if (ret)
			return ret;
	}

	ret = __stmmac_dvr_probe(dev, plat_dat, res);
	if (ret && plat_dat->exit)
		plat_dat->exit(dev, plat_dat->bsp_priv);

	return ret;
}
EXPORT_SYMBOL_GPL(stmmac_dvr_probe);

/**
 * stmmac_dvr_remove
 * @dev: device pointer
 * Description: this function resets the TX/RX processes, disables the MAC RX/TX
 * changes the link status, releases the DMA descriptor rings.
 */
void stmmac_dvr_remove(struct device *dev)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	struct stmmac_priv *priv = netdev_priv(ndev);

	netdev_info(priv->dev, "%s: removing driver", __func__);

	pm_runtime_get_sync(dev);

	unregister_netdev(ndev);

#ifdef CONFIG_DEBUG_FS
	stmmac_exit_fs(ndev);
#endif
	stmmac_unregister_devlink(priv);

	phylink_destroy(priv->phylink);
	if (priv->plat->stmmac_rst)
		reset_control_assert(priv->plat->stmmac_rst);
	reset_control_assert(priv->plat->stmmac_ahb_rst);

	stmmac_pcs_clean(ndev);
	stmmac_mdio_unregister(ndev);

	destroy_workqueue(priv->wq);
	mutex_destroy(&priv->lock);
	bitmap_free(priv->af_xdp_zc_qps);

	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);

	if (priv->plat->exit)
		priv->plat->exit(dev, priv->plat->bsp_priv);
}
EXPORT_SYMBOL_GPL(stmmac_dvr_remove);

/**
 * stmmac_suspend - suspend callback
 * @dev: device pointer
 * Description: this is the function to suspend the device and it is called
 * by the platform driver to stop the network queue, release the resources,
 * program the PMT register (for WoL), clean and release driver resources.
 */
int stmmac_suspend(struct device *dev)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	u8 chan;

	if (!ndev || !netif_running(ndev))
		goto suspend_bsp;

	mutex_lock(&priv->lock);

	netif_device_detach(ndev);

	stmmac_disable_all_queues(priv);

	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);

	if (priv->eee_sw_timer_en) {
		priv->tx_path_in_lpi_mode = false;
		timer_delete_sync(&priv->eee_ctrl_timer);
	}

	/* Stop TX/RX DMA */
	stmmac_stop_all_dma(priv);

	stmmac_legacy_serdes_power_down(priv);

	/* Enable Power down mode by programming the PMT regs */
	if (priv->wolopts) {
		stmmac_pmt(priv, priv->hw, priv->wolopts);
		priv->irq_wake = 1;
	} else {
		stmmac_mac_set(priv, priv->ioaddr, false);
		pinctrl_pm_select_sleep_state(priv->device);
	}

	mutex_unlock(&priv->lock);

	rtnl_lock();
	phylink_suspend(priv->phylink, !!priv->wolopts);
	rtnl_unlock();

	if (stmmac_fpe_supported(priv))
		ethtool_mmsv_stop(&priv->fpe_cfg.mmsv);

suspend_bsp:
	if (priv->plat->suspend)
		return priv->plat->suspend(dev, priv->plat->bsp_priv);

	return 0;
}
EXPORT_SYMBOL_GPL(stmmac_suspend);

static void stmmac_reset_rx_queue(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];

	rx_q->cur_rx = 0;
	rx_q->dirty_rx = 0;
}

static void stmmac_reset_tx_queue(struct stmmac_priv *priv, u32 queue)
{
	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];

	tx_q->cur_tx = 0;
	tx_q->dirty_tx = 0;
	tx_q->mss = 0;

	netdev_tx_reset_queue(netdev_get_tx_queue(priv->dev, queue));
}

/**
 * stmmac_reset_queues_param - reset queue parameters
 * @priv: device pointer
 */
static void stmmac_reset_queues_param(struct stmmac_priv *priv)
{
	u8 rx_cnt = priv->plat->rx_queues_to_use;
	u8 tx_cnt = priv->plat->tx_queues_to_use;
	u8 queue;

	for (queue = 0; queue < rx_cnt; queue++)
		stmmac_reset_rx_queue(priv, queue);

	for (queue = 0; queue < tx_cnt; queue++)
		stmmac_reset_tx_queue(priv, queue);
}

/**
 * stmmac_resume - resume callback
 * @dev: device pointer
 * Description: when resume this function is invoked to setup the DMA and CORE
 * in a usable state.
 */
int stmmac_resume(struct device *dev)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	int ret;

	if (priv->plat->resume) {
		ret = priv->plat->resume(dev, priv->plat->bsp_priv);
		if (ret)
			return ret;
	}

	if (!netif_running(ndev))
		return 0;

	/* Power Down bit, into the PM register, is cleared
	 * automatically as soon as a magic packet or a Wake-up frame
	 * is received. Anyway, it's better to manually clear
	 * this bit because it can generate problems while resuming
	 * from another devices (e.g. serial console).
	 */
	if (priv->wolopts) {
		mutex_lock(&priv->lock);
		stmmac_pmt(priv, priv->hw, 0);
		mutex_unlock(&priv->lock);
		priv->irq_wake = 0;
	} else {
		pinctrl_pm_select_default_state(priv->device);
		/* reset the phy so that it's ready */
		if (priv->mii)
			stmmac_mdio_reset(priv->mii);
	}

	if (!(priv->plat->flags & STMMAC_FLAG_SERDES_UP_AFTER_PHY_LINKUP)) {
		ret = stmmac_legacy_serdes_power_up(priv);
		if (ret < 0)
			return ret;
	}

	rtnl_lock();

	/* Prepare the PHY to resume, ensuring that its clocks which are
	 * necessary for the MAC DMA reset to complete are running
	 */
	phylink_prepare_resume(priv->phylink);

	mutex_lock(&priv->lock);

	stmmac_reset_queues_param(priv);

	stmmac_free_tx_skbufs(priv);
	stmmac_clear_descriptors(priv, &priv->dma_conf);

	ret = stmmac_hw_setup(ndev);
	if (ret < 0) {
		netdev_err(priv->dev, "%s: Hw setup failed\n", __func__);
		stmmac_legacy_serdes_power_down(priv);
		mutex_unlock(&priv->lock);
		rtnl_unlock();
		return ret;
	}

	stmmac_init_timestamping(priv);

	stmmac_init_coalesce(priv);
	phylink_rx_clk_stop_block(priv->phylink);
	stmmac_set_rx_mode(ndev);
	phylink_rx_clk_stop_unblock(priv->phylink);

	stmmac_vlan_restore(priv);

	stmmac_enable_all_queues(priv);
	stmmac_enable_all_dma_irq(priv);

	mutex_unlock(&priv->lock);

	/* phylink_resume() must be called after the hardware has been
	 * initialised because it may bring the link up immediately in a
	 * workqueue thread, which will race with initialisation.
	 */
	phylink_resume(priv->phylink);
	rtnl_unlock();

	netif_device_attach(ndev);

	return 0;
}
EXPORT_SYMBOL_GPL(stmmac_resume);

/* This is not the same as EXPORT_GPL_SIMPLE_DEV_PM_OPS() when CONFIG_PM=n */
DEFINE_SIMPLE_DEV_PM_OPS(stmmac_simple_pm_ops, stmmac_suspend, stmmac_resume);
EXPORT_SYMBOL_GPL(stmmac_simple_pm_ops);

#ifndef MODULE
static int __init stmmac_cmdline_opt(char *str)
{
	char *opt;

	if (!str || !*str)
		return 1;
	while ((opt = strsep(&str, ",")) != NULL) {
		if (!strncmp(opt, "debug:", 6)) {
			if (kstrtoint(opt + 6, 0, &debug))
				goto err;
		} else if (!strncmp(opt, "phyaddr:", 8)) {
			if (kstrtoint(opt + 8, 0, &phyaddr))
				goto err;
		} else if (!strncmp(opt, "tc:", 3)) {
			if (kstrtoint(opt + 3, 0, &tc))
				goto err;
		} else if (!strncmp(opt, "watchdog:", 9)) {
			if (kstrtoint(opt + 9, 0, &watchdog))
				goto err;
		} else if (!strncmp(opt, "flow_ctrl:", 10)) {
			if (kstrtoint(opt + 10, 0, &flow_ctrl))
				goto err;
		} else if (!strncmp(opt, "pause:", 6)) {
			if (kstrtoint(opt + 6, 0, &pause))
				goto err;
		} else if (!strncmp(opt, "eee_timer:", 10)) {
			if (kstrtoint(opt + 10, 0, &eee_timer))
				goto err;
		} else if (!strncmp(opt, "chain_mode:", 11)) {
			if (kstrtoint(opt + 11, 0, &chain_mode))
				goto err;
		}
	}
	return 1;

err:
	pr_err("%s: ERROR broken module parameter conversion", __func__);
	return 1;
}

__setup("stmmaceth=", stmmac_cmdline_opt);
#endif /* MODULE */

static int __init stmmac_init(void)
{
#ifdef CONFIG_DEBUG_FS
	/* Create debugfs main directory if it doesn't exist yet */
	if (!stmmac_fs_dir)
		stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
	register_netdevice_notifier(&stmmac_notifier);
#endif

	return 0;
}

static void __exit stmmac_exit(void)
{
#ifdef CONFIG_DEBUG_FS
	unregister_netdevice_notifier(&stmmac_notifier);
	debugfs_remove_recursive(stmmac_fs_dir);
#endif
}

module_init(stmmac_init)
module_exit(stmmac_exit)

MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet device driver");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL");