1 /* SPDX-License-Identifier: (GPL-2.0 OR MIT)
4  * Copyright (C) 2015-2024 Google LLC
10 #include <linux/dma-mapping.h>
33 /* 1 for management, 1 for rx, 1 for tx */
36 /* Numbers of gve tx/rx stats in stats report. */
43 /* Numbers of NIC tx/rx stats in stats report. */
49 #define GVE_DATA_SLOT_ADDR_PAGE_MASK (~(PAGE_SIZE - 1))
71 	(GVE_ADMINQ_BUFFER_SIZE / sizeof(((struct gve_adminq_queried_flow_rule *)0)->location))
89 /* 2K buffers for DQO-QPL */
95  * allocs and uses a non-qpl page on the receive path of DQO QPL to free
108 /* The page info for a single slot in the RX data queue */
121 	u16 pad; /* adjustment for rx padding */
125 /* A list of pages registered with the device during setup and used by a queue
140 	struct gve_queue_page_list *qpl; /* qpl assigned to this queue */
146 /* RX buffer queue for posting buffers to HW.
147  * Each RX (completion) queue has a corresponding buffer queue.
157 /* RX completion queue to receive packets from HW. */
163 	 * post more buffers than the queue size to avoid HW overrunning the
164 	 * queue.
199 	/* Linked list index to next element in the list, or -1 if none */
203 /* `head` and `tail` are indices into an array, or -1 if empty. */
229 /* Contains datapath state used to represent an RX queue. */
234 	u16 packet_buffer_truesize;	/* Total size of RX buffer */
260 			 * buf_states, or -1 if empty.
265 			 * buf_states, or -1 if empty.
277 			 * buf_states, or -1 if empty.
284 			/* qpl assigned to this queue */
287 			/* index into queue page list */
293 			/* Address info of the buffers for header-split */
300 	u64 rbytes; /* free-running bytes received */
301 	u64 rx_hsplit_bytes; /* free-running header bytes received */
302 	u64 rpackets; /* free-running packets received */
303 	u32 cnt; /* free-running total number of completed packets */
304 	u32 fill_cnt; /* free-running total number of descs and buffs posted */
306 	u64 rx_hsplit_pkt; /* free-running packets with headers split */
307 	u64 rx_copybreak_pkt; /* free-running count of copybreak packets */
308 	u64 rx_copied_pkt; /* free-running total number of copied packets */
309 	u64 rx_skb_alloc_fail; /* free-running count of skb alloc fails */
310 	u64 rx_buf_alloc_fail; /* free-running count of buffer alloc fails */
311 	u64 rx_desc_err_dropped_pkt; /* free-running count of packets dropped by descriptor error */
312 	/* free-running count of unsplit packets due to header buffer overflow or hdr_len is 0 */
314 	u64 rx_cont_packet_cnt; /* free-running multi-fragment packets received */
315 	u64 rx_frag_flip_cnt; /* free-running count of rx segments where page_flip was used */
316 	u64 rx_frag_copy_cnt; /* free-running count of rx segments copied */
317 	u64 rx_frag_alloc_cnt; /* free-running count of rx page allocations */
322 	u32 q_num; /* queue index */
325 	dma_addr_t q_resources_bus; /* dma address for the queue resources */
339 	struct gve_tx_pkt_desc pkt; /* first desc for a packet */  member
356 		struct sk_buff *skb; /* skb for this pkt */
360 		u16 size; /* size of xmitted xdp pkt */
364 		struct gve_tx_iovec iov[GVE_TX_MAX_IOVEC]; /* segments of this pkt */
372 /* A TX buffer - each queue has one */
383 	struct gve_tx_pkt_desc_dqo pkt;  member
396 	 * re-injection completion.
422 	/* Linked list index to next element in the list, or -1 if none */
425 	/* Linked list index to prev element in the list, or -1 if none.
437 	 * freed if the corresponding re-injection completion is not received
443 /* Contains datapath state used to represent a TX queue. */
445 	/* Cacheline 0 -- Accessed & dirtied during transmit */
457 			 * pending_packets, or -1 if empty.
483 				* tx_qpl_buf_next, or -1 if empty.
503 	/* Cacheline 1 -- Accessed & dirtied during gve_clean_tx_done */
521 			 * pending_packets, or -1 if empty.
547 				 * tx_qpl_buf_next, or -1 if empty.
563 	u64 pkt_done; /* free-running - total packets completed */
564 	u64 bytes_done; /* free-running - total bytes completed */
565 	u64 dropped_pkt; /* free-running - total packets dropped */
568 	/* Cacheline 2 -- Read-mostly fields */
590 				/* qpl assigned to this queue */
607 	u32 mask; /* masks req and done down to queue size */
610 	/* Slow-path fields */
611 	u32 q_num ____cacheline_aligned; /* queue idx */
612 	u32 stop_queue; /* count of queue stops */
613 	u32 wake_queue; /* count of queue wakes */
614 	u32 queue_timeout; /* count of queue timeouts */
616 	u32 last_kick_msec; /* Last time the queue was kicked */
618 	dma_addr_t q_resources_bus; /* dma address of the queue resources */
636 	struct gve_rx_ring *rx; /* rx rings on this block */  member
640 /* Tracks allowed and current rx queue settings */
647 /* Tracks allowed and current tx queue settings */
686 /* Parameters for allocating resources for rx queues */
700 	struct gve_rx_ring *rx;  member
756 	struct gve_rx_ring *rx; /* array of rx_cfg.num_queues */  member
784 	u32 num_ntfy_blks; /* spilt between TX and RX so must be even */
794 	/* Admin queue - see gve_adminq.h*/
800 	u32 adminq_prod_cnt; /* free-running count of AQ cmds executed */
801 	u32 adminq_cmd_fail; /* free-running count of AQ cmds failed */
802 	u32 adminq_timeouts; /* free-running count of AQ cmds timeouts */
803 	/* free-running count of per AQ cmd executed */
829 	u32 stats_report_trigger_cnt; /* count of device-requested stats-reports since last reset */
861 	u16 header_buf_size; /* device configured, header-split supported if non-zero */
895 	return test_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_get_do_reset()
900 	set_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_set_do_reset()
905 	clear_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_clear_do_reset()
911 			&priv->service_task_flags);  in gve_get_reset_in_progress()
916 	set_bit(GVE_PRIV_FLAGS_RESET_IN_PROGRESS, &priv->service_task_flags);  in gve_set_reset_in_progress()
921 	clear_bit(GVE_PRIV_FLAGS_RESET_IN_PROGRESS, &priv->service_task_flags);  in gve_clear_reset_in_progress()
927 			&priv->service_task_flags);  in gve_get_probe_in_progress()
932 	set_bit(GVE_PRIV_FLAGS_PROBE_IN_PROGRESS, &priv->service_task_flags);  in gve_set_probe_in_progress()
937 	clear_bit(GVE_PRIV_FLAGS_PROBE_IN_PROGRESS, &priv->service_task_flags);  in gve_clear_probe_in_progress()
943 			&priv->service_task_flags);  in gve_get_do_report_stats()
948 	set_bit(GVE_PRIV_FLAGS_DO_REPORT_STATS, &priv->service_task_flags);  in gve_set_do_report_stats()
953 	clear_bit(GVE_PRIV_FLAGS_DO_REPORT_STATS, &priv->service_task_flags);  in gve_clear_do_report_stats()
958 	return test_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_get_admin_queue_ok()
963 	set_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_set_admin_queue_ok()
968 	clear_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_clear_admin_queue_ok()
973 	return test_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_get_device_resources_ok()
978 	set_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_set_device_resources_ok()
983 	clear_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_clear_device_resources_ok()
988 	return test_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_get_device_rings_ok()
993 	set_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_set_device_rings_ok()
998 	clear_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_clear_device_rings_ok()
1003 	return test_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_get_napi_enabled()
1008 	set_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_set_napi_enabled()
1013 	clear_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_clear_napi_enabled()
1018 	return test_bit(GVE_PRIV_FLAGS_REPORT_STATS, &priv->ethtool_flags);  in gve_get_report_stats()
1023 	clear_bit(GVE_PRIV_FLAGS_REPORT_STATS, &priv->ethtool_flags);  in gve_clear_report_stats()
1031 	return &priv->db_bar2[be32_to_cpu(*block->irq_db_index)];  in gve_irq_doorbell()
1041 /* Returns the index into ntfy_blocks of the given rx ring's block
1045 	return (priv->num_ntfy_blks / 2) + queue_idx;  in gve_rx_idx_to_ntfy()
1050 	return priv->queue_format == GVE_GQI_QPL_FORMAT ||  in gve_is_qpl()
1051 		priv->queue_format == GVE_DQO_QPL_FORMAT;  in gve_is_qpl()
1054 /* Returns the number of tx queue page lists */
1060 	return tx_cfg->num_queues + tx_cfg->num_xdp_queues;  in gve_num_tx_qpls()
1063 /* Returns the number of rx queue page lists */
1069 	return rx_cfg->num_queues;  in gve_num_rx_qpls()
1079 	return priv->tx_cfg.max_queues + rx_qid;  in gve_rx_qpl_id()
1085 	return tx_cfg->max_queues + rx_qid;  in gve_get_rx_qpl_id()
1101 	 * out-of-order completions. Set it to two times of ring size.  in gve_get_rx_pages_per_qpl_dqo()
1106 /* Returns the correct dma direction for tx and rx qpls */
1110 	if (id < gve_rx_start_qpl_id(&priv->tx_cfg))  in gve_qpl_dma_dir()
1118 	return priv->queue_format == GVE_GQI_RDA_FORMAT ||  in gve_is_gqi()
1119 		priv->queue_format == GVE_GQI_QPL_FORMAT;  in gve_is_gqi()
1124 	return priv->tx_cfg.num_queues + priv->tx_cfg.num_xdp_queues;  in gve_num_tx_queues()
1129 	return priv->tx_cfg.num_queues + queue_id;  in gve_xdp_tx_queue_id()
1139 	switch (priv->queue_format) {  in gve_supports_xdp_xmit()
1181 /* rx handling */
1182 void gve_rx_write_doorbell(struct gve_priv *priv, struct gve_rx_ring *rx);
1184 bool gve_rx_work_pending(struct gve_rx_ring *rx);
1187 			  struct gve_rx_ring *rx,
1189 void gve_rx_free_ring_gqi(struct gve_priv *priv, struct gve_rx_ring *rx,
1200 /* rx buffer handling */
1204 struct gve_rx_buf_state_dqo *gve_alloc_buf_state(struct gve_rx_ring *rx);
1205 bool gve_buf_state_is_allocated(struct gve_rx_ring *rx,
1207 void gve_free_buf_state(struct gve_rx_ring *rx,
1209 struct gve_rx_buf_state_dqo *gve_dequeue_buf_state(struct gve_rx_ring *rx,
1211 void gve_enqueue_buf_state(struct gve_rx_ring *rx, struct gve_index_list *list,
1213 struct gve_rx_buf_state_dqo *gve_get_recycled_buf_state(struct gve_rx_ring *rx);
1214 void gve_try_recycle_buf(struct gve_priv *priv, struct gve_rx_ring *rx,
1216 void gve_free_to_page_pool(struct gve_rx_ring *rx,
1219 int gve_alloc_qpl_page_dqo(struct gve_rx_ring *rx,
1222 void gve_reuse_buffer(struct gve_rx_ring *rx,
1224 void gve_free_buffer(struct gve_rx_ring *rx,
1226 int gve_alloc_buffer(struct gve_rx_ring *rx, struct gve_rx_desc_dqo *desc);
1228 					  struct gve_rx_ring *rx,