1 /* SPDX-License-Identifier: (GPL-2.0 OR MIT)
4  * Copyright (C) 2015-2024 Google LLC
10 #include <linux/dma-mapping.h>
32 /* 1 for management, 1 for rx, 1 for tx */
35 /* Numbers of gve tx/rx stats in stats report. */
42 /* Numbers of NIC tx/rx stats in stats report. */
48 #define GVE_DATA_SLOT_ADDR_PAGE_MASK (~(PAGE_SIZE - 1))
66 	(GVE_ADMINQ_BUFFER_SIZE / sizeof(((struct gve_adminq_queried_flow_rule *)0)->location))
81 /* 2K buffers for DQO-QPL */
87  * allocs and uses a non-qpl page on the receive path of DQO QPL to free
100 /* The page info for a single slot in the RX data queue */
110 /* A list of pages registered with the device during setup and used by a queue
125 	struct gve_queue_page_list *qpl; /* qpl assigned to this queue */
131 /* RX buffer queue for posting buffers to HW.
132  * Each RX (completion) queue has a corresponding buffer queue.
142 /* RX completion queue to receive packets from HW. */
148 	 * post more buffers than the queue size to avoid HW overrunning the
149 	 * queue.
184 	/* Linked list index to next element in the list, or -1 if none */
188 /* `head` and `tail` are indices into an array, or -1 if empty. */
214 /* Contains datapath state used to represent an RX queue. */
241 			 * buf_states, or -1 if empty.
246 			 * buf_states, or -1 if empty.
258 			 * buf_states, or -1 if empty.
265 			/* qpl assigned to this queue */
268 			/* index into queue page list */
274 			/* Address info of the buffers for header-split */
279 	u64 rbytes; /* free-running bytes received */
280 	u64 rx_hsplit_bytes; /* free-running header bytes received */
281 	u64 rpackets; /* free-running packets received */
282 	u32 cnt; /* free-running total number of completed packets */
283 	u32 fill_cnt; /* free-running total number of descs and buffs posted */
285 	u64 rx_hsplit_pkt; /* free-running packets with headers split */
286 	u64 rx_copybreak_pkt; /* free-running count of copybreak packets */
287 	u64 rx_copied_pkt; /* free-running total number of copied packets */
288 	u64 rx_skb_alloc_fail; /* free-running count of skb alloc fails */
289 	u64 rx_buf_alloc_fail; /* free-running count of buffer alloc fails */
290 	u64 rx_desc_err_dropped_pkt; /* free-running count of packets dropped by descriptor error */
291 	/* free-running count of unsplit packets due to header buffer overflow or hdr_len is 0 */
293 	u64 rx_cont_packet_cnt; /* free-running multi-fragment packets received */
294 	u64 rx_frag_flip_cnt; /* free-running count of rx segments where page_flip was used */
295 	u64 rx_frag_copy_cnt; /* free-running count of rx segments copied */
296 	u64 rx_frag_alloc_cnt; /* free-running count of rx page allocations */
301 	u32 q_num; /* queue index */
304 	dma_addr_t q_resources_bus; /* dma address for the queue resources */
316 /* A TX desc ring entry */
318 	struct gve_tx_pkt_desc pkt; /* first desc for a packet */  member
335 		struct sk_buff *skb; /* skb for this pkt */
339 		u16 size; /* size of xmitted xdp pkt */
343 		struct gve_tx_iovec iov[GVE_TX_MAX_IOVEC]; /* segments of this pkt */
351 /* A TX buffer - each queue has one */
360 /* TX descriptor for DQO format */
362 	struct gve_tx_pkt_desc_dqo pkt;  member
375 	 * re-injection completion.
401 	/* Linked list index to next element in the list, or -1 if none */
404 	/* Linked list index to prev element in the list, or -1 if none.
416 	 * freed if the corresponding re-injection completion is not received
422 /* Contains datapath state used to represent a TX queue. */
424 	/* Cacheline 0 -- Accessed & dirtied during transmit */
436 			 * pending_packets, or -1 if empty.
438 			 * This is a consumer list owned by the TX path. When it
462 				* tx_qpl_buf_next, or -1 if empty.
464 				* This is a consumer list owned by the TX path. When it
471 			       /* Free running count of the number of QPL tx buffers
482 	/* Cacheline 1 -- Accessed & dirtied during gve_clean_tx_done */
488 			/* Spinlock for XDP tx traffic */
500 			 * pending_packets, or -1 if empty.
509 			/* Last TX ring index fetched by HW */
526 				 * tx_qpl_buf_next, or -1 if empty.
535 				/* Free running count of the number of tx buffers
542 	u64 pkt_done; /* free-running - total packets completed */
543 	u64 bytes_done; /* free-running - total bytes completed */
544 	u64 dropped_pkt; /* free-running - total packets dropped */
547 	/* Cacheline 2 -- Read-mostly fields */
569 				/* qpl assigned to this queue */
572 				/* Each QPL page is divided into TX bounce buffers
574 				 * an array to manage linked lists of TX buffers.
586 	u32 mask; /* masks req and done down to queue size */
589 	/* Slow-path fields */
590 	u32 q_num ____cacheline_aligned; /* queue idx */
591 	u32 stop_queue; /* count of queue stops */
592 	u32 wake_queue; /* count of queue wakes */
593 	u32 queue_timeout; /* count of queue timeouts */
595 	u32 last_kick_msec; /* Last time the queue was kicked */
597 	dma_addr_t q_resources_bus; /* dma address of the queue resources */
616 	struct gve_tx_ring *tx; /* tx rings on this block */  member
621 /* Tracks allowed and current queue settings */
646 /* Parameters for allocating resources for tx queues */
656 	struct gve_tx_ring *tx;  member
661 	/* tx config is also needed to determine QPL ids */
721 	struct gve_tx_ring *tx; /* array of tx_cfg.num_queues */  member
741 	u16 tx_pages_per_qpl; /* Suggested number of pages per qpl for TX queues by NIC */
751 	u32 num_ntfy_blks; /* spilt between TX and RX so must be even */
761 	/* Admin queue - see gve_adminq.h*/
767 	u32 adminq_prod_cnt; /* free-running count of AQ cmds executed */
768 	u32 adminq_cmd_fail; /* free-running count of AQ cmds failed */
769 	u32 adminq_timeouts; /* free-running count of AQ cmds timeouts */
770 	/* free-running count of per AQ cmd executed */
796 	u32 stats_report_trigger_cnt; /* count of device-requested stats-reports since last reset */
829 	u16 header_buf_size; /* device configured, header-split supported if non-zero */
861 	return test_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_get_do_reset()
866 	set_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_set_do_reset()
871 	clear_bit(GVE_PRIV_FLAGS_DO_RESET, &priv->service_task_flags);  in gve_clear_do_reset()
877 			&priv->service_task_flags);  in gve_get_reset_in_progress()
882 	set_bit(GVE_PRIV_FLAGS_RESET_IN_PROGRESS, &priv->service_task_flags);  in gve_set_reset_in_progress()
887 	clear_bit(GVE_PRIV_FLAGS_RESET_IN_PROGRESS, &priv->service_task_flags);  in gve_clear_reset_in_progress()
893 			&priv->service_task_flags);  in gve_get_probe_in_progress()
898 	set_bit(GVE_PRIV_FLAGS_PROBE_IN_PROGRESS, &priv->service_task_flags);  in gve_set_probe_in_progress()
903 	clear_bit(GVE_PRIV_FLAGS_PROBE_IN_PROGRESS, &priv->service_task_flags);  in gve_clear_probe_in_progress()
909 			&priv->service_task_flags);  in gve_get_do_report_stats()
914 	set_bit(GVE_PRIV_FLAGS_DO_REPORT_STATS, &priv->service_task_flags);  in gve_set_do_report_stats()
919 	clear_bit(GVE_PRIV_FLAGS_DO_REPORT_STATS, &priv->service_task_flags);  in gve_clear_do_report_stats()
924 	return test_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_get_admin_queue_ok()
929 	set_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_set_admin_queue_ok()
934 	clear_bit(GVE_PRIV_FLAGS_ADMIN_QUEUE_OK, &priv->state_flags);  in gve_clear_admin_queue_ok()
939 	return test_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_get_device_resources_ok()
944 	set_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_set_device_resources_ok()
949 	clear_bit(GVE_PRIV_FLAGS_DEVICE_RESOURCES_OK, &priv->state_flags);  in gve_clear_device_resources_ok()
954 	return test_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_get_device_rings_ok()
959 	set_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_set_device_rings_ok()
964 	clear_bit(GVE_PRIV_FLAGS_DEVICE_RINGS_OK, &priv->state_flags);  in gve_clear_device_rings_ok()
969 	return test_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_get_napi_enabled()
974 	set_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_set_napi_enabled()
979 	clear_bit(GVE_PRIV_FLAGS_NAPI_ENABLED, &priv->state_flags);  in gve_clear_napi_enabled()
984 	return test_bit(GVE_PRIV_FLAGS_REPORT_STATS, &priv->ethtool_flags);  in gve_get_report_stats()
989 	clear_bit(GVE_PRIV_FLAGS_REPORT_STATS, &priv->ethtool_flags);  in gve_clear_report_stats()
997 	return &priv->db_bar2[be32_to_cpu(*block->irq_db_index)];  in gve_irq_doorbell()
1000 /* Returns the index into ntfy_blocks of the given tx ring's block
1011 	return (priv->num_ntfy_blks / 2) + queue_idx;  in gve_rx_idx_to_ntfy()
1016 	return priv->queue_format == GVE_GQI_QPL_FORMAT ||  in gve_is_qpl()
1017 		priv->queue_format == GVE_DQO_QPL_FORMAT;  in gve_is_qpl()
1020 /* Returns the number of tx queue page lists */
1027 	return tx_cfg->num_queues + num_xdp_queues;  in gve_num_tx_qpls()
1030 /* Returns the number of XDP tx queue page lists
1034 	if (priv->queue_format != GVE_GQI_QPL_FORMAT)  in gve_num_xdp_qpls()
1037 	return priv->num_xdp_queues;  in gve_num_xdp_qpls()
1040 /* Returns the number of rx queue page lists */
1046 	return rx_cfg->num_queues;  in gve_num_rx_qpls()
1056 	return priv->tx_cfg.max_queues + rx_qid;  in gve_rx_qpl_id()
1061 	return tx_cfg->max_queues + rx_qid;  in gve_get_rx_qpl_id()
1077 	 * out-of-order completions. Set it to two times of ring size.  in gve_get_rx_pages_per_qpl_dqo()
1082 /* Returns the correct dma direction for tx and rx qpls */
1086 	if (id < gve_rx_start_qpl_id(&priv->tx_cfg))  in gve_qpl_dma_dir()
1094 	return priv->queue_format == GVE_GQI_RDA_FORMAT ||  in gve_is_gqi()
1095 		priv->queue_format == GVE_GQI_QPL_FORMAT;  in gve_is_gqi()
1100 	return priv->tx_cfg.num_queues + priv->num_xdp_queues;  in gve_num_tx_queues()
1105 	return priv->tx_cfg.num_queues + queue_id;  in gve_xdp_tx_queue_id()
1128 /* tx handling */
1132 int gve_xdp_xmit_one(struct gve_priv *priv, struct gve_tx_ring *tx,
1144 			      struct gve_tx_ring *tx);
1145 bool gve_tx_clean_pending(struct gve_priv *priv, struct gve_tx_ring *tx);