[dpdk-dev] [PATCH v3 1/3] net/bnxt: cache address of doorbell to subsequent access

[Ajit Khaparde <ajit.khaparde@broadcom.com>]

While creating TX, Rx, CQ rings use cached DB address instead of
getting it from the PCI memory resource.
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/bnxt.h        |  1 +
 drivers/net/bnxt/bnxt_cpr.c    |  2 +-
 drivers/net/bnxt/bnxt_ethdev.c | 12 ++++++++++++
 drivers/net/bnxt/bnxt_ring.c   | 17 +++++------------
 4 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index bdca2622f..97b0e0853 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -208,6 +208,7 @@ struct bnxt {
 	struct rte_eth_dev		*eth_dev;
 	struct rte_eth_rss_conf		rss_conf;
 	struct rte_pci_device		*pdev;
+	void				*doorbell_base;
 
 	uint32_t		flags;
 #define BNXT_FLAG_REGISTERED	(1 << 0)
diff --git a/drivers/net/bnxt/bnxt_cpr.c b/drivers/net/bnxt/bnxt_cpr.c
index 5ac197ea7..8dde8cc0f 100644
--- a/drivers/net/bnxt/bnxt_cpr.c
+++ b/drivers/net/bnxt/bnxt_cpr.c
@@ -144,7 +144,7 @@ int bnxt_alloc_def_cp_ring(struct bnxt *bp)
 				  HWRM_NA_SIGNATURE);
 	if (rc)
 		goto err_out;
-	cpr->cp_doorbell = bp->pdev->mem_resource[2].addr;
+	cpr->cp_doorbell = (char *)bp->doorbell_base;
 	B_CP_DIS_DB(cpr, cpr->cp_raw_cons);
 	if (BNXT_PF(bp))
 		rc = bnxt_hwrm_func_cfg_def_cp(bp);
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index 7632c326b..a133114a3 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -3095,11 +3095,23 @@ static int bnxt_init_board(struct rte_eth_dev *eth_dev)
 		rc = -ENOMEM;
 		goto init_err_release;
 	}
+
+	if (!pci_dev->mem_resource[2].addr) {
+		PMD_DRV_LOG(ERR,
+			    "Cannot find PCI device BAR 2 address, aborting\n");
+		rc = -ENODEV;
+		goto init_err_release;
+	} else {
+		bp->doorbell_base = (void *)pci_dev->mem_resource[2].addr;
+	}
+
 	return 0;
 
 init_err_release:
 	if (bp->bar0)
 		bp->bar0 = NULL;
+	if (bp->doorbell_base)
+		bp->doorbell_base = NULL;
 
 init_err_disable:
 
diff --git a/drivers/net/bnxt/bnxt_ring.c b/drivers/net/bnxt/bnxt_ring.c
index 478eab4f3..8e822e11f 100644
--- a/drivers/net/bnxt/bnxt_ring.c
+++ b/drivers/net/bnxt/bnxt_ring.c
@@ -261,7 +261,6 @@ int bnxt_alloc_rings(struct bnxt *bp, uint16_t qidx,
  */
 int bnxt_alloc_hwrm_rings(struct bnxt *bp)
 {
-	struct rte_pci_device *pci_dev = bp->pdev;
 	unsigned int i;
 	int rc = 0;
 
@@ -283,8 +282,7 @@ int bnxt_alloc_hwrm_rings(struct bnxt *bp)
 					HWRM_NA_SIGNATURE);
 		if (rc)
 			goto err_out;
-		cpr->cp_doorbell = (char *)pci_dev->mem_resource[2].addr +
-		    idx * 0x80;
+		cpr->cp_doorbell = (char *)bp->doorbell_base + idx * 0x80;
 		bp->grp_info[i].cp_fw_ring_id = cp_ring->fw_ring_id;
 		B_CP_DIS_DB(cpr, cpr->cp_raw_cons);
 
@@ -296,8 +294,7 @@ int bnxt_alloc_hwrm_rings(struct bnxt *bp)
 		if (rc)
 			goto err_out;
 		rxr->rx_prod = 0;
-		rxr->rx_doorbell = (char *)pci_dev->mem_resource[2].addr +
-		    idx * 0x80;
+		rxr->rx_doorbell = (char *)bp->doorbell_base + idx * 0x80;
 		bp->grp_info[i].rx_fw_ring_id = ring->fw_ring_id;
 		B_RX_DB(rxr->rx_doorbell, rxr->rx_prod);
 
@@ -316,9 +313,7 @@ int bnxt_alloc_hwrm_rings(struct bnxt *bp)
 			goto err_out;
 		PMD_DRV_LOG(DEBUG, "Alloc AGG Done!\n");
 		rxr->ag_prod = 0;
-		rxr->ag_doorbell =
-		    (char *)pci_dev->mem_resource[2].addr +
-		    map_idx * 0x80;
+		rxr->ag_doorbell = (char *)bp->doorbell_base + map_idx * 0x80;
 		bp->grp_info[i].ag_fw_ring_id = ring->fw_ring_id;
 		B_RX_DB(rxr->ag_doorbell, rxr->ag_prod);
 
@@ -350,8 +345,7 @@ int bnxt_alloc_hwrm_rings(struct bnxt *bp)
 		if (rc)
 			goto err_out;
 
-		cpr->cp_doorbell = (char *)pci_dev->mem_resource[2].addr +
-		    idx * 0x80;
+		cpr->cp_doorbell = (char *)bp->doorbell_base + idx * 0x80;
 		B_CP_DIS_DB(cpr, cpr->cp_raw_cons);
 
 		/* Tx ring */
@@ -362,8 +356,7 @@ int bnxt_alloc_hwrm_rings(struct bnxt *bp)
 		if (rc)
 			goto err_out;
 
-		txr->tx_doorbell = (char *)pci_dev->mem_resource[2].addr +
-		    idx * 0x80;
+		txr->tx_doorbell = (char *)bp->doorbell_base + idx * 0x80;
 		txq->index = idx;
 	}
 
-- 
2.15.1 (Apple Git-101)