bnxt_en: fix potentially incorrect return value for ndo_rx_flow_steer

[ Upstream commit 02597d39145bb0aa81d04bf39b6a913ce9a9d465 ]

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@purestorage.com>
Signed-off-by: Alex Barba <alex.barba@broadcom.com>
Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 77dadbe1a44644fb076f188d2a5567c2a9f5e9e5..ceaa066bdc3331d3f8c44a4f2968a521db1cbd01 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6577,8 +6577,8 @@ 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;
                }
        }