bnxt_en: Consolidate DB offset calculation

The doorbell offset on P5 chips is hard coded.  On the new P7 chips,
it is returned by the firmware.  Simplify the logic that determines
this offset and store it in a new db_offset field in struct bnxt.
Also, provide this offset to the RoCE driver in struct bnxt_en_dev.

Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Hongguang Gao <hongguang.gao@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231201223924.26955-5-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

4 files changed, 16 insertions, 15 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 829b2a6a05a0..a17de1aceff4 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6031,10 +6031,6 @@ static void bnxt_set_db(struct bnxt *bp, struct bnxt_db_info *db, u32 ring_type,
 			u32 map_idx, u32 xid)
 {
 	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) {
-		if (BNXT_PF(bp))
-			db->doorbell = bp->bar1 + DB_PF_OFFSET_P5;
-		else
-			db->doorbell = bp->bar1 + DB_VF_OFFSET_P5;
 		switch (ring_type) {
 		case HWRM_RING_ALLOC_TX:
 			db->db_key64 = DBR_PATH_L2 | DBR_TYPE_SQ;
@@ -6054,6 +6050,8 @@ static void bnxt_set_db(struct bnxt *bp, struct bnxt_db_info *db, u32 ring_type,
 
 		if (bp->flags & BNXT_FLAG_CHIP_P7)
 			db->db_key64 |= DBR_VALID;
+
+		db->doorbell = bp->bar1 + bp->db_offset;
 	} else {
 		db->doorbell = bp->bar1 + map_idx * 0x80;
 		switch (ring_type) {
@@ -7146,7 +7144,6 @@ static int bnxt_hwrm_func_qcfg(struct bnxt *bp)
 {
 	struct hwrm_func_qcfg_output *resp;
 	struct hwrm_func_qcfg_input *req;
-	u32 min_db_offset = 0;
 	u16 flags;
 	int rc;
 
@@ -7204,16 +7201,17 @@ static int bnxt_hwrm_func_qcfg(struct bnxt *bp)
 	if (bp->db_size)
 		goto func_qcfg_exit;
 
-	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) {
+	bp->db_offset = le16_to_cpu(resp->legacy_l2_db_size_kb) * 1024;
+	if (BNXT_CHIP_P5(bp)) {
 		if (BNXT_PF(bp))
-			min_db_offset = DB_PF_OFFSET_P5;
+			bp->db_offset = DB_PF_OFFSET_P5;
 		else
-			min_db_offset = DB_VF_OFFSET_P5;
+			bp->db_offset = DB_VF_OFFSET_P5;
 	}
 	bp->db_size = PAGE_ALIGN(le16_to_cpu(resp->l2_doorbell_bar_size_kb) *
 				 1024);
 	if (!bp->db_size || bp->db_size > pci_resource_len(bp->pdev, 2) ||
-	    bp->db_size <= min_db_offset)
+	    bp->db_size <= bp->db_offset)
 		bp->db_size = pci_resource_len(bp->pdev, 2);
 
 func_qcfg_exit:
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 40b26f7a0f5e..6d96f66dc8c0 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2216,6 +2216,7 @@ struct bnxt {
 	/* ensure atomic 64-bit doorbell writes on 32-bit systems. */
 	spinlock_t		db_lock;
 #endif
+	int			db_offset;	/* db_offset within db_size */
 	int			db_size;
 
 #define BNXT_NTP_FLTR_MAX_FLTR	4096
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
index e89731492f5e..93f9bd55020f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
@@ -42,13 +42,10 @@ static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
 	for (i = 0; i < num_msix; i++) {
 		ent[i].vector = bp->irq_tbl[idx + i].vector;
 		ent[i].ring_idx = idx + i;
-		if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) {
-			ent[i].db_offset = DB_PF_OFFSET_P5;
-			if (BNXT_VF(bp))
-				ent[i].db_offset = DB_VF_OFFSET_P5;
-		} else {
+		if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
+			ent[i].db_offset = bp->db_offset;
+		else
 			ent[i].db_offset = (idx + i) * 0x80;
-		}
 	}
 }
 
@@ -333,6 +330,7 @@ static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp)
 	edev->pdev = bp->pdev;
 	edev->l2_db_size = bp->db_size;
 	edev->l2_db_size_nc = bp->db_size;
+	edev->l2_db_offset = bp->db_offset;
 
 	if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 		edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
index 6ff77f082e6c..b9e73de14b57 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
@@ -73,6 +73,10 @@ struct bnxt_en_dev {
 							 * bytes mapped as non-
 							 * cacheable.
 							 */
+	int				l2_db_offset;	/* Doorbell offset in
+							 * bytes within
+							 * l2_db_size_nc.
+							 */
 	u16				chip_num;
 	u16				hw_ring_stats_size;
 	u16				pf_port_id;