net/bnxt: use dedicated CPR for async events

This commit enables the creation of a dedicated completion
ring for asynchronous event handling instead of handling these
events on a receive completion ring.

For the stingray platform and other platforms needing tighter
control of resource utilization, we retain the ability to
process async events on a receive completion ring.

For Thor-based adapters, we use a dedicated NQ (notification
queue) ring for async events (async events can't currently
be received on a completion ring due to a firmware limitation).

Rename "def_cp_ring" to "async_cp_ring" to better reflect its
purpose (async event notifications) and to avoid confusion with
VNIC default receive completion rings.

Allow rxq 0 to be stopped when not being used for async events.

Signed-off-by: Lance Richardson <lance.richardson@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>

drivers/net/bnxt/bnxt.h

@@ -33,6 +33,12 @@
 #define BNXT_MAX_RX_RING_DESC	8192
 #define BNXT_DB_SIZE		0x80
 
+#ifdef RTE_ARCH_ARM64
+#define BNXT_NUM_ASYNC_CPR(bp) (BNXT_STINGRAY(bp) ? 0 : 1)
+#else
+#define BNXT_NUM_ASYNC_CPR(bp) 1
+#endif
+
 /* Chimp Communication Channel */
 #define GRCPF_REG_CHIMP_CHANNEL_OFFSET		0x0
 #define GRCPF_REG_CHIMP_COMM_TRIGGER		0x100
@@ -351,6 +357,7 @@ struct bnxt {
 #define BNXT_FLAG_TRUSTED_VF_EN	(1 << 11)
 #define BNXT_FLAG_DFLT_VNIC_SET	(1 << 12)
 #define BNXT_FLAG_THOR_CHIP	(1 << 13)
+#define BNXT_FLAG_STINGRAY	(1 << 14)
 #define BNXT_FLAG_EXT_STATS_SUPPORTED	(1 << 29)
 #define BNXT_FLAG_NEW_RM	(1 << 30)
 #define BNXT_FLAG_INIT_DONE	(1U << 31)
@@ -363,6 +370,7 @@ struct bnxt {
 #define BNXT_USE_KONG(bp)	((bp)->flags & BNXT_FLAG_KONG_MB_EN)
 #define BNXT_VF_IS_TRUSTED(bp)	((bp)->flags & BNXT_FLAG_TRUSTED_VF_EN)
 #define BNXT_CHIP_THOR(bp)	((bp)->flags & BNXT_FLAG_THOR_CHIP)
+#define BNXT_STINGRAY(bp)	((bp)->flags & BNXT_FLAG_STINGRAY)
 #define BNXT_HAS_NQ(bp)		BNXT_CHIP_THOR(bp)
 #define BNXT_HAS_RING_GRPS(bp)	(!BNXT_CHIP_THOR(bp))
 
@@ -387,7 +395,7 @@ struct bnxt {
 	uint16_t		fw_tx_port_stats_ext_size;
 
 	/* Default completion ring */
-	struct bnxt_cp_ring_info	*def_cp_ring;
+	struct bnxt_cp_ring_info	*async_cp_ring;
 	uint32_t		max_ring_grps;
 	struct bnxt_ring_grp_info	*grp_info;
 

drivers/net/bnxt/bnxt_ethdev.c

@@ -200,12 +200,17 @@ static void bnxt_free_mem(struct bnxt *bp)
 	bnxt_free_stats(bp);
 	bnxt_free_tx_rings(bp);
 	bnxt_free_rx_rings(bp);
+	bnxt_free_async_cp_ring(bp);
 }
 
 static int bnxt_alloc_mem(struct bnxt *bp)
 {
 	int rc;
 
+	rc = bnxt_alloc_async_ring_struct(bp);
+	if (rc)
+		goto alloc_mem_err;
+
 	rc = bnxt_alloc_vnic_mem(bp);
 	if (rc)
 		goto alloc_mem_err;
@@ -218,6 +223,10 @@ static int bnxt_alloc_mem(struct bnxt *bp)
 	if (rc)
 		goto alloc_mem_err;
 
+	rc = bnxt_alloc_async_cp_ring(bp);
+	if (rc)
+		goto alloc_mem_err;
+
 	return 0;
 
 alloc_mem_err:
@@ -617,8 +626,8 @@ static int bnxt_dev_configure_op(struct rte_eth_dev *eth_dev)
 	/* Inherit new configurations */
 	if (eth_dev->data->nb_rx_queues > bp->max_rx_rings ||
 	    eth_dev->data->nb_tx_queues > bp->max_tx_rings ||
-	    eth_dev->data->nb_rx_queues + eth_dev->data->nb_tx_queues >
-	    bp->max_cp_rings ||
+	    eth_dev->data->nb_rx_queues + eth_dev->data->nb_tx_queues
+		+ BNXT_NUM_ASYNC_CPR(bp) > bp->max_cp_rings ||
 	    eth_dev->data->nb_rx_queues + eth_dev->data->nb_tx_queues >
 	    bp->max_stat_ctx)
 		goto resource_error;
@@ -3802,6 +3811,12 @@ bnxt_dev_init(struct rte_eth_dev *eth_dev)
 	    pci_dev->id.device_id == BROADCOM_DEV_ID_57500_VF2)
 		bp->flags |= BNXT_FLAG_THOR_CHIP;
 
+	if (pci_dev->id.device_id == BROADCOM_DEV_ID_58802 ||
+	    pci_dev->id.device_id == BROADCOM_DEV_ID_58804 ||
+	    pci_dev->id.device_id == BROADCOM_DEV_ID_58808 ||
+	    pci_dev->id.device_id == BROADCOM_DEV_ID_58802_VF)
+		bp->flags |= BNXT_FLAG_STINGRAY;
+
 	rc = bnxt_init_board(eth_dev);
 	if (rc) {
 		PMD_DRV_LOG(ERR,

drivers/net/bnxt/bnxt_hwrm.c

@@ -737,9 +737,12 @@ int bnxt_hwrm_func_reserve_vf_resc(struct bnxt *bp, bool test)
 	req.num_tx_rings = rte_cpu_to_le_16(bp->tx_nr_rings);
 	req.num_rx_rings = rte_cpu_to_le_16(bp->rx_nr_rings *
 					    AGG_RING_MULTIPLIER);
-	req.num_stat_ctxs = rte_cpu_to_le_16(bp->rx_nr_rings + bp->tx_nr_rings);
+	req.num_stat_ctxs = rte_cpu_to_le_16(bp->rx_nr_rings +
+					     bp->tx_nr_rings +
+					     BNXT_NUM_ASYNC_CPR(bp));
 	req.num_cmpl_rings = rte_cpu_to_le_16(bp->rx_nr_rings +
-					      bp->tx_nr_rings);
+					      bp->tx_nr_rings +
+					      BNXT_NUM_ASYNC_CPR(bp));
 	req.num_vnics = rte_cpu_to_le_16(bp->rx_nr_rings);
 	if (bp->vf_resv_strategy ==
 	    HWRM_FUNC_RESOURCE_QCAPS_OUTPUT_VF_RESV_STRATEGY_MINIMAL_STATIC) {
@@ -2073,7 +2076,7 @@ int bnxt_free_all_hwrm_ring_grps(struct bnxt *bp)
 	return rc;
 }
 
-static void bnxt_free_nq_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr)
+void bnxt_free_nq_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr)
 {
 	struct bnxt_ring *cp_ring = cpr->cp_ring_struct;
 
@@ -2083,9 +2086,10 @@ static void bnxt_free_nq_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr)
 	memset(cpr->cp_desc_ring, 0, cpr->cp_ring_struct->ring_size *
 				     sizeof(*cpr->cp_desc_ring));
 	cpr->cp_raw_cons = 0;
+	cpr->valid = 0;
 }
 
-static void bnxt_free_cp_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr)
+void bnxt_free_cp_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr)
 {
 	struct bnxt_ring *cp_ring = cpr->cp_ring_struct;
 
@@ -3212,7 +3216,7 @@ int bnxt_hwrm_func_cfg_def_cp(struct bnxt *bp)
 	req.enables = rte_cpu_to_le_32(
 			HWRM_FUNC_CFG_INPUT_ENABLES_ASYNC_EVENT_CR);
 	req.async_event_cr = rte_cpu_to_le_16(
-			bp->def_cp_ring->cp_ring_struct->fw_ring_id);
+			bp->async_cp_ring->cp_ring_struct->fw_ring_id);
 	rc = bnxt_hwrm_send_message(bp, &req, sizeof(req), BNXT_USE_CHIMP_MB);
 
 	HWRM_CHECK_RESULT();
@@ -3232,7 +3236,7 @@ int bnxt_hwrm_vf_func_cfg_def_cp(struct bnxt *bp)
 	req.enables = rte_cpu_to_le_32(
 			HWRM_FUNC_VF_CFG_INPUT_ENABLES_ASYNC_EVENT_CR);
 	req.async_event_cr = rte_cpu_to_le_16(
-			bp->def_cp_ring->cp_ring_struct->fw_ring_id);
+			bp->async_cp_ring->cp_ring_struct->fw_ring_id);
 	rc = bnxt_hwrm_send_message(bp, &req, sizeof(req), BNXT_USE_CHIMP_MB);
 
 	HWRM_CHECK_RESULT();

drivers/net/bnxt/bnxt_hwrm.h

@@ -119,6 +119,8 @@ int bnxt_free_all_hwrm_stat_ctxs(struct bnxt *bp);
 int bnxt_free_all_hwrm_rings(struct bnxt *bp);
 int bnxt_free_all_hwrm_ring_grps(struct bnxt *bp);
 int bnxt_alloc_all_hwrm_ring_grps(struct bnxt *bp);
+void bnxt_free_cp_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr);
+void bnxt_free_nq_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cpr);
 int bnxt_set_hwrm_vnic_filters(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 int bnxt_clear_hwrm_vnic_filters(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 void bnxt_free_all_hwrm_resources(struct bnxt *bp);

drivers/net/bnxt/bnxt_irq.c

@@ -22,7 +22,7 @@ static void bnxt_int_handler(void *param)
 {
 	struct rte_eth_dev *eth_dev = (struct rte_eth_dev *)param;
 	struct bnxt *bp = eth_dev->data->dev_private;
-	struct bnxt_cp_ring_info *cpr = bp->def_cp_ring;
+	struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
 	struct cmpl_base *cmp;
 	uint32_t raw_cons;
 	uint32_t cons;
@@ -43,10 +43,13 @@ static void bnxt_int_handler(void *param)
 
 		bnxt_event_hwrm_resp_handler(bp, cmp);
 		raw_cons = NEXT_RAW_CMP(raw_cons);
-	};
+	}
 
 	cpr->cp_raw_cons = raw_cons;
-	B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
+	if (BNXT_HAS_NQ(bp))
+		bnxt_db_nq_arm(cpr);
+	else
+		B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
 }
 
 int bnxt_free_int(struct bnxt *bp)
@@ -92,27 +95,43 @@ int bnxt_free_int(struct bnxt *bp)
 
 void bnxt_disable_int(struct bnxt *bp)
 {
-	struct bnxt_cp_ring_info *cpr = bp->def_cp_ring;
+	struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
+
+	if (BNXT_NUM_ASYNC_CPR(bp) == 0)
+		return;
+
+	if (!cpr || !cpr->cp_db.doorbell)
+		return;
 
 	/* Only the default completion ring */
-	if (cpr != NULL && cpr->cp_db.doorbell != NULL)
+	if (BNXT_HAS_NQ(bp))
+		bnxt_db_nq(cpr);
+	else
 		B_CP_DB_DISARM(cpr);
 }
 
 void bnxt_enable_int(struct bnxt *bp)
 {
-	struct bnxt_cp_ring_info *cpr = bp->def_cp_ring;
+	struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
+
+	if (BNXT_NUM_ASYNC_CPR(bp) == 0)
+		return;
+
+	if (!cpr || !cpr->cp_db.doorbell)
+		return;
 
 	/* Only the default completion ring */
-	if (cpr != NULL && cpr->cp_db.doorbell != NULL)
+	if (BNXT_HAS_NQ(bp))
+		bnxt_db_nq_arm(cpr);
+	else
 		B_CP_DB_ARM(cpr);
 }
 
 int bnxt_setup_int(struct bnxt *bp)
 {
 	uint16_t total_vecs;
 	const int len = sizeof(bp->irq_tbl[0].name);
-	int i, rc = 0;
+	int i;
 
 	/* DPDK host only supports 1 MSI-X vector */
 	total_vecs = 1;
@@ -126,14 +145,11 @@ int bnxt_setup_int(struct bnxt *bp)
 			bp->irq_tbl[i].handler = bnxt_int_handler;
 		}
 	} else {
-		rc = -ENOMEM;
-		goto setup_exit;
+		PMD_DRV_LOG(ERR, "bnxt_irq_tbl setup failed\n");
+		return -ENOMEM;
 	}
-	return 0;
 
-setup_exit:
-	PMD_DRV_LOG(ERR, "bnxt_irq_tbl setup failed\n");
-	return rc;
+	return 0;
 }
 
 int bnxt_request_int(struct bnxt *bp)