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Date: Mon, 13 Nov 2023 16:16:12 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	gospo@...adcom.com,
	Andy Gospodarek <andrew.gospodarek@...adcom.com>
Subject: [PATCH net-next v2 04/13] bnxt_en: Add completion ring pointer in TX and RX ring structures

>From the TX or RX ring structure, we need to find the corresponding
completion ring during initialization.  On P5 chips, we use the MSIX/napi
entry to locate the completion ring because there is only one RX/TX
ring per MSIX.  To allow multiple TX rings for each MSIX, we need
to add a direct pointer from the TX ring and RX ring structures.
This also simplifies the existing logic.

Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 40 ++++++++-----------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  2 +
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  2 +-
 3 files changed, 19 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 585120369935..11a85cb28517 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -3584,11 +3584,11 @@ static int bnxt_alloc_cp_sub_ring(struct bnxt *bp,
 static int bnxt_alloc_cp_rings(struct bnxt *bp)
 {
 	bool sh = !!(bp->flags & BNXT_FLAG_SHARED_RINGS);
-	int i, rc, ulp_base_vec, ulp_msix;
+	int i, j, rc, ulp_base_vec, ulp_msix;
 
 	ulp_msix = bnxt_get_ulp_msix_num(bp);
 	ulp_base_vec = bnxt_get_ulp_msix_base(bp);
-	for (i = 0; i < bp->cp_nr_rings; i++) {
+	for (i = 0, j = 0; i < bp->cp_nr_rings; i++) {
 		struct bnxt_napi *bnapi = bp->bnapi[i];
 		struct bnxt_cp_ring_info *cpr, *cpr2;
 		struct bnxt_ring_struct *ring;
@@ -3626,6 +3626,7 @@ static int bnxt_alloc_cp_rings(struct bnxt *bp)
 			if (rc)
 				return rc;
 			cpr2->bnapi = bnapi;
+			bp->rx_ring[i].rx_cpr = cpr2;
 		}
 		if ((sh && i < bp->tx_nr_rings) ||
 		    (!sh && i >= bp->rx_nr_rings)) {
@@ -3634,6 +3635,7 @@ static int bnxt_alloc_cp_rings(struct bnxt *bp)
 			if (rc)
 				return rc;
 			cpr2->bnapi = bnapi;
+			bp->tx_ring[j++].tx_cpr = cpr2;
 		}
 	}
 	return 0;
@@ -4654,6 +4656,8 @@ static int bnxt_alloc_mem(struct bnxt *bp, bool irq_re_init)
 					BNXT_RMEM_RING_PTE_FLAG;
 				rxr->rx_agg_ring_struct.ring_mem.flags =
 					BNXT_RMEM_RING_PTE_FLAG;
+			} else {
+				rxr->rx_cpr =  &bp->bnapi[i]->cp_ring;
 			}
 			rxr->bnapi = bp->bnapi[i];
 			bp->bnapi[i]->rx_ring = &bp->rx_ring[i];
@@ -4682,6 +4686,8 @@ static int bnxt_alloc_mem(struct bnxt *bp, bool irq_re_init)
 			if (bp->flags & BNXT_FLAG_CHIP_P5)
 				txr->tx_ring_struct.ring_mem.flags =
 					BNXT_RMEM_RING_PTE_FLAG;
+			else
+				txr->tx_cpr =  &bp->bnapi[i]->cp_ring;
 			txr->bnapi = bp->bnapi[j];
 			bp->bnapi[j]->tx_ring = txr;
 			bp->tx_ring_map[i] = bp->tx_nr_rings_xdp + i;
@@ -5242,28 +5248,18 @@ static u16 bnxt_cp_ring_from_grp(struct bnxt *bp, struct bnxt_ring_struct *ring)
 
 static u16 bnxt_cp_ring_for_rx(struct bnxt *bp, struct bnxt_rx_ring_info *rxr)
 {
-	if (bp->flags & BNXT_FLAG_CHIP_P5) {
-		struct bnxt_napi *bnapi = rxr->bnapi;
-		struct bnxt_cp_ring_info *cpr;
-
-		cpr = &bnapi->cp_ring.cp_ring_arr[BNXT_RX_HDL];
-		return cpr->cp_ring_struct.fw_ring_id;
-	} else {
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		return rxr->rx_cpr->cp_ring_struct.fw_ring_id;
+	else
 		return bnxt_cp_ring_from_grp(bp, &rxr->rx_ring_struct);
-	}
 }
 
 static u16 bnxt_cp_ring_for_tx(struct bnxt *bp, struct bnxt_tx_ring_info *txr)
 {
-	if (bp->flags & BNXT_FLAG_CHIP_P5) {
-		struct bnxt_napi *bnapi = txr->bnapi;
-		struct bnxt_cp_ring_info *cpr;
-
-		cpr = &bnapi->cp_ring.cp_ring_arr[BNXT_TX_HDL];
-		return cpr->cp_ring_struct.fw_ring_id;
-	} else {
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		return txr->tx_cpr->cp_ring_struct.fw_ring_id;
+	else
 		return bnxt_cp_ring_from_grp(bp, &txr->tx_ring_struct);
-	}
 }
 
 static int bnxt_alloc_rss_indir_tbl(struct bnxt *bp)
@@ -6022,12 +6018,10 @@ static int bnxt_hwrm_ring_alloc(struct bnxt *bp)
 		u32 map_idx;
 
 		if (bp->flags & BNXT_FLAG_CHIP_P5) {
+			struct bnxt_cp_ring_info *cpr2 = txr->tx_cpr;
 			struct bnxt_napi *bnapi = txr->bnapi;
-			struct bnxt_cp_ring_info *cpr, *cpr2;
 			u32 type2 = HWRM_RING_ALLOC_CMPL;
 
-			cpr = &bnapi->cp_ring;
-			cpr2 = &cpr->cp_ring_arr[BNXT_TX_HDL];
 			ring = &cpr2->cp_ring_struct;
 			ring->handle = BNXT_TX_HDL;
 			map_idx = bnapi->index;
@@ -6062,11 +6056,9 @@ static int bnxt_hwrm_ring_alloc(struct bnxt *bp)
 			bnxt_db_write(bp, &rxr->rx_db, rxr->rx_prod);
 		bp->grp_info[map_idx].rx_fw_ring_id = ring->fw_ring_id;
 		if (bp->flags & BNXT_FLAG_CHIP_P5) {
-			struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
+			struct bnxt_cp_ring_info *cpr2 = rxr->rx_cpr;
 			u32 type2 = HWRM_RING_ALLOC_CMPL;
-			struct bnxt_cp_ring_info *cpr2;
 
-			cpr2 = &cpr->cp_ring_arr[BNXT_RX_HDL];
 			ring = &cpr2->cp_ring_struct;
 			ring->handle = BNXT_RX_HDL;
 			rc = hwrm_ring_alloc_send_msg(bp, ring, type2, map_idx);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 429df1cf4a6a..c04089e7ac39 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -806,6 +806,7 @@ struct bnxt_db_info {
 
 struct bnxt_tx_ring_info {
 	struct bnxt_napi	*bnapi;
+	struct bnxt_cp_ring_info	*tx_cpr;
 	u16			tx_prod;
 	u16			tx_cons;
 	u16			tx_hw_cons;
@@ -916,6 +917,7 @@ struct bnxt_tpa_idx_map {
 
 struct bnxt_rx_ring_info {
 	struct bnxt_napi	*bnapi;
+	struct bnxt_cp_ring_info	*rx_cpr;
 	u16			rx_prod;
 	u16			rx_agg_prod;
 	u16			rx_sw_agg_prod;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 675e37700289..18c06158fead 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -3941,7 +3941,7 @@ static int bnxt_run_loopback(struct bnxt *bp)
 
 	cpr = &rxr->bnapi->cp_ring;
 	if (bp->flags & BNXT_FLAG_CHIP_P5)
-		cpr = &cpr->cp_ring_arr[BNXT_RX_HDL];
+		cpr = rxr->rx_cpr;
 	pkt_size = min(bp->dev->mtu + ETH_HLEN, bp->rx_copy_thresh);
 	skb = netdev_alloc_skb(bp->dev, pkt_size);
 	if (!skb)
-- 
2.30.1


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