netdev - [PATCH net 7/8] bnxt_en: init RSS table for Minimal-Static VF reservation

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Message-Id: <1598418519-20168-8-git-send-email-michael.chan@broadcom.com>
Date:   Wed, 26 Aug 2020 01:08:38 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        Edwin Peer <edwin.peer@...adcom.com>
Subject: [PATCH net 7/8] bnxt_en: init RSS table for Minimal-Static VF reservation

From: Edwin Peer <edwin.peer@...adcom.com>

There are no VF rings available during probe when the device is configured
using the Minimal-Static reservation strategy. In this case, the RSS
indirection table can only be initialized later, during bnxt_open_nic().
However, this was not happening because the rings will already have been
reserved via bnxt_init_dflt_ring_mode(), causing bnxt_need_reserve_rings()
to return false in bnxt_reserve_rings() and bypass the RSS table init.

Solve this by pushing the call to bnxt_set_dflt_rss_indir_tbl() into
__bnxt_reserve_rings(), which is common to both paths and is called
whenever ring configuration is changed. After doing this, the RSS table
init that must be called from bnxt_init_one() happens implicitly via
bnxt_set_default_rings(), necessitating doing the allocation earlier in
order to avoid a null pointer dereference.

Fixes: bd3191b5d87d ("bnxt_en: Implement ethtool -X to set indirection table.")
Signed-off-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index a23ccb0..27df572 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6219,6 +6219,9 @@ static int __bnxt_reserve_rings(struct bnxt *bp)
 	if (!tx || !rx || !cp || !grp || !vnic || !stat)
 		return -ENOMEM;
 
+	if (!netif_is_rxfh_configured(bp->dev))
+		bnxt_set_dflt_rss_indir_tbl(bp);
+
 	return rc;
 }
 
@@ -8500,9 +8503,6 @@ int bnxt_reserve_rings(struct bnxt *bp, bool irq_re_init)
 			rc = bnxt_init_int_mode(bp);
 		bnxt_ulp_irq_restart(bp, rc);
 	}
-	if (!netif_is_rxfh_configured(bp->dev))
-		bnxt_set_dflt_rss_indir_tbl(bp);
-
 	if (rc) {
 		netdev_err(bp->dev, "ring reservation/IRQ init failure rc: %d\n", rc);
 		return rc;
@@ -12209,6 +12209,10 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (BNXT_CHIP_P5(bp))
 		bp->flags |= BNXT_FLAG_CHIP_P5;
 
+	rc = bnxt_alloc_rss_indir_tbl(bp);
+	if (rc)
+		goto init_err_pci_clean;
+
 	rc = bnxt_fw_init_one_p2(bp);
 	if (rc)
 		goto init_err_pci_clean;
@@ -12313,11 +12317,6 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 */
 	bp->tx_nr_rings_per_tc = bp->tx_nr_rings;
 
-	rc = bnxt_alloc_rss_indir_tbl(bp);
-	if (rc)
-		goto init_err_pci_clean;
-	bnxt_set_dflt_rss_indir_tbl(bp);
-
 	if (BNXT_PF(bp)) {
 		if (!bnxt_pf_wq) {
 			bnxt_pf_wq =
-- 
1.8.3.1