netdev - [PATCH net 4/4] bnxt_en: fix potentially incorrect return value for ndo_rx_flow

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Date:   Thu,  3 Nov 2022 19:33:27 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com, gospo@...adcom.com,
        Alex Barba <alex.barba@...adcom.com>
Subject: [PATCH net 4/4] bnxt_en: fix potentially incorrect return value for ndo_rx_flow_steer

From: Alex Barba <alex.barba@...adcom.com>

In the bnxt_en driver ndo_rx_flow_steer returns '0' whenever an entry
that we are attempting to steer is already found.  This is not the
correct behavior.  The return code should be the value/index that
corresponds to the entry.  Returning zero all the time causes the
RFS records to be incorrect unless entry '0' is the correct one.  As
flows migrate to different cores this can create entries that are not
correct.

Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.")
Reported-by: Akshay Navgire <anavgire@...estorage.com>
Signed-off-by: Alex Barba <alex.barba@...adcom.com>
Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index f44f9367b7fd..c78b6e9dea2c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -12903,8 +12903,8 @@ static int bnxt_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(fltr, head, hash) {
 		if (bnxt_fltr_match(fltr, new_fltr)) {
+			rc = fltr->sw_id;
 			rcu_read_unlock();
-			rc = 0;
 			goto err_free;
 		}
 	}
-- 
2.18.1


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