1 /* SPDX-License-Identifier: (GPL-2.0 OR MIT)
4  * Copyright (C) 2015-2021 Google, Inc.
10 #include <linux/dma-mapping.h>
31 /* 1 for management, 1 for rx, 1 for tx */
34 /* Numbers of gve tx/rx stats in stats report. */
41 /* Numbers of NIC tx/rx stats in stats report. */
47 #define GVE_DATA_SLOT_ADDR_PAGE_MASK (~(PAGE_SIZE - 1))
68 /* 2K buffers for DQO-QPL */
74  * allocs and uses a non-qpl page on the receive path of DQO QPL to free
87 /* The page info for a single slot in the RX data queue */
97 /* A list of pages registered with the device during setup and used by a queue
112 	struct gve_queue_page_list *qpl; /* qpl assigned to this queue */
118 /* RX buffer queue for posting buffers to HW.
119  * Each RX (completion) queue has a corresponding buffer queue.
129 /* RX completion queue to receive packets from HW. */
135 	 * post more buffers than the queue size to avoid HW overrunning the
136 	 * queue.
166 	/* Linked list index to next element in the list, or -1 if none */
170 /* `head` and `tail` are indices into an array, or -1 if empty. */
196 /* Contains datapath state used to represent an RX queue. */
223 			 * buf_states, or -1 if empty.
228 			 * buf_states, or -1 if empty.
240 			 * buf_states, or -1 if empty.
247 			/* qpl assigned to this queue */
250 			/* index into queue page list */
258 	u64 rbytes; /* free-running bytes received */
259 	u64 rpackets; /* free-running packets received */
260 	u32 cnt; /* free-running total number of completed packets */
261 	u32 fill_cnt; /* free-running total number of descs and buffs posted */
263 	u64 rx_copybreak_pkt; /* free-running count of copybreak packets */
264 	u64 rx_copied_pkt; /* free-running total number of copied packets */
265 	u64 rx_skb_alloc_fail; /* free-running count of skb alloc fails */
266 	u64 rx_buf_alloc_fail; /* free-running count of buffer alloc fails */
267 	u64 rx_desc_err_dropped_pkt; /* free-running count of packets dropped by descriptor error */
268 	u64 rx_cont_packet_cnt; /* free-running multi-fragment packets received */
269 	u64 rx_frag_flip_cnt; /* free-running count of rx segments where page_flip was used */
270 	u64 rx_frag_copy_cnt; /* free-running count of rx segments copied */
271 	u64 rx_frag_alloc_cnt; /* free-running count of rx page allocations */
276 	u32 q_num; /* queue index */
279 	dma_addr_t q_resources_bus; /* dma address for the queue resources */
291 /* A TX desc ring entry */
293 	struct gve_tx_pkt_desc pkt; /* first desc for a packet */  member
310 		struct sk_buff *skb; /* skb for this pkt */
314 		u16 size; /* size of xmitted xdp pkt */
318 		struct gve_tx_iovec iov[GVE_TX_MAX_IOVEC]; /* segments of this pkt */
326 /* A TX buffer - each queue has one */
335 /* TX descriptor for DQO format */
337 	struct gve_tx_pkt_desc_dqo pkt;  member
350 	 * re-injection completion.
376 	/* Linked list index to next element in the list, or -1 if none */
379 	/* Linked list index to prev element in the list, or -1 if none.
391 	 * freed if the corresponding re-injection completion is not received
397 /* Contains datapath state used to represent a TX queue. */
399 	/* Cacheline 0 -- Accessed & dirtied during transmit */
411 			 * pending_packets, or -1 if empty.
413 			 * This is a consumer list owned by the TX path. When it
437 				* tx_qpl_buf_next, or -1 if empty.
439 				* This is a consumer list owned by the TX path. When it
446 			       /* Free running count of the number of QPL tx buffers
457 	/* Cacheline 1 -- Accessed & dirtied during gve_clean_tx_done */
463 			/* Spinlock for XDP tx traffic */
475 			 * pending_packets, or -1 if empty.
484 			/* Last TX ring index fetched by HW */
501 				 * tx_qpl_buf_next, or -1 if empty.
510 				/* Free running count of the number of tx buffers
517 	u64 pkt_done; /* free-running - total packets completed */
518 	u64 bytes_done; /* free-running - total bytes completed */
519 	u64 dropped_pkt; /* free-running - total packets dropped */
522 	/* Cacheline 2 -- Read-mostly fields */
544 				/* qpl assigned to this queue */
547 				/* Each QPL page is divided into TX bounce buffers
549 				 * an array to manage linked lists of TX buffers.
561 	u32 mask; /* masks req and done down to queue size */
564 	/* Slow-path fields */
565 	u32 q_num ____cacheline_aligned; /* queue idx */
566 	u32 stop_queue; /* count of queue stops */
567 	u32 wake_queue; /* count of queue wakes */
568 	u32 queue_timeout; /* count of queue timeouts */
570 	u32 last_kick_msec; /* Last time the queue was kicked */
572 	dma_addr_t q_resources_bus; /* dma address of the queue resources */
591 	struct gve_tx_ring *tx; /* tx rings on this block */  member
595 /* Tracks allowed and current queue settings */
639 	struct gve_tx_ring *tx; /* array of tx_cfg.num_queues */  member
654 	u16 tx_pages_per_qpl; /* Suggested number of pages per qpl for TX queues by NIC */
667 	u32 num_ntfy_blks; /* spilt between TX and RX so must be even */
677 	/* Admin queue - see gve_adminq.h*/
682 	u32 adminq_prod_cnt; /* free-running count of AQ cmds executed */
683 	u32 adminq_cmd_fail; /* free-running count of AQ cmds failed */
684 	u32 adminq_timeouts; /* free-running count of AQ cmds timeouts */
685 	/* free-running count of per AQ cmd executed */
707 	u32 stats_report_trigger_cnt; /* count of device-requested stats-reports since last reset */
761 	return test_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_get_do_reset()
766 	set_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_set_do_reset()
771 	clear_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_clear_do_reset()
777 			&priv->service_task_flags);  in gve_get_reset_in_progress()
782 	set_bit(GVE_PRIV_FLAGS_RESET_IN_PROGRESS, &priv->service_task_flags);  in gve_set_reset_in_progress()
787 	clear_bit(GVE_PRIV_FLAGS_RESET_IN_PROGRESS, &priv->service_task_flags);  in gve_clear_reset_in_progress()
793 			&priv->service_task_flags);  in gve_get_probe_in_progress()
798 	set_bit(GVE_PRIV_FLAGS_PROBE_IN_PROGRESS, &priv->service_task_flags);  in gve_set_probe_in_progress()
803 	clear_bit(GVE_PRIV_FLAGS_PROBE_IN_PROGRESS, &priv->service_task_flags);  in gve_clear_probe_in_progress()
809 			&priv->service_task_flags);  in gve_get_do_report_stats()
814 	set_bit(GVE_PRIV_FLAGS_DO_REPORT_STATS, &priv->service_task_flags);  in gve_set_do_report_stats()
819 	clear_bit(GVE_PRIV_FLAGS_DO_REPORT_STATS, &priv->service_task_flags);  in gve_clear_do_report_stats()
824 	return test_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_get_admin_queue_ok()
829 	set_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_set_admin_queue_ok()
834 	clear_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_clear_admin_queue_ok()
839 	return test_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_get_device_resources_ok()
844 	set_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_set_device_resources_ok()
849 	clear_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_clear_device_resources_ok()
854 	return test_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_get_device_rings_ok()
859 	set_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_set_device_rings_ok()
864 	clear_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_clear_device_rings_ok()
869 	return test_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_get_napi_enabled()
874 	set_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_set_napi_enabled()
879 	clear_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_clear_napi_enabled()
884 	return test_bit(GVE_PRIV_FLAGS_REPORT_STATS, &priv->ethtool_flags);  in gve_get_report_stats()
889 	clear_bit(GVE_PRIV_FLAGS_REPORT_STATS, &priv->ethtool_flags);  in gve_clear_report_stats()
897 	return &priv->db_bar2[be32_to_cpu(*block->irq_db_index)];  in gve_irq_doorbell()
900 /* Returns the index into ntfy_blocks of the given tx ring's block
911 	return (priv->num_ntfy_blks / 2) + queue_idx;  in gve_rx_idx_to_ntfy()
916 	return priv->queue_format == GVE_GQI_QPL_FORMAT ||  in gve_is_qpl()
917 		priv->queue_format == GVE_DQO_QPL_FORMAT;  in gve_is_qpl()
920 /* Returns the number of tx queue page lists
927 	return priv->tx_cfg.num_queues + priv->num_xdp_queues;  in gve_num_tx_qpls()
930 /* Returns the number of XDP tx queue page lists
934 	if (priv->queue_format != GVE_GQI_QPL_FORMAT)  in gve_num_xdp_qpls()
937 	return priv->num_xdp_queues;  in gve_num_xdp_qpls()
940 /* Returns the number of rx queue page lists
947 	return priv->rx_cfg.num_queues;  in gve_num_rx_qpls()
957 	return priv->tx_cfg.max_queues + rx_qid;  in gve_rx_qpl_id()
970 /* Returns a pointer to the next available tx qpl in the list of qpls
978 	if (test_bit(id, priv->qpl_cfg.qpl_id_map))  in gve_assign_tx_qpl()
981 	set_bit(id, priv->qpl_cfg.qpl_id_map);  in gve_assign_tx_qpl()
982 	return &priv->qpls[id];  in gve_assign_tx_qpl()
993 	if (test_bit(id, priv->qpl_cfg.qpl_id_map))  in gve_assign_rx_qpl()
996 	set_bit(id, priv->qpl_cfg.qpl_id_map);  in gve_assign_rx_qpl()
997 	return &priv->qpls[id];  in gve_assign_rx_qpl()
1004 	clear_bit(id, priv->qpl_cfg.qpl_id_map);  in gve_unassign_qpl()
1007 /* Returns the correct dma direction for tx and rx qpls
1020 	return priv->queue_format == GVE_GQI_RDA_FORMAT ||  in gve_is_gqi()
1021 		priv->queue_format == GVE_GQI_QPL_FORMAT;  in gve_is_gqi()
1026 	return priv->tx_cfg.num_queues + priv->num_xdp_queues;  in gve_num_tx_queues()
1031 	return priv->tx_cfg.num_queues + queue_id;  in gve_xdp_tx_queue_id()
1045 /* tx handling */
1049 int gve_xdp_xmit_one(struct gve_priv *priv, struct gve_tx_ring *tx,
1057 			      struct gve_tx_ring *tx);
1058 bool gve_tx_clean_pending(struct gve_priv *priv, struct gve_tx_ring *tx);