net/bnxt: fix restoring VLAN filtering after recovery

[ upstream commit 8717548 ]

During port start, driver calls bnxt_vlan_offload_set_op()
to program VLAN Filter/VLAN Strip setting to the HW. This
in turns add the vlan filters.

This results in a failure when bnxt_restore_filters() invokes
bnxt_restore_vlan_filters() during the recovery as the vlans are
already programmed.

Fix to ignore the error(-EEXIST).

Fixes: 151c824 ("net/bnxt: restore VLAN filters during reset recovery")

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>

drivers/net/bnxt/bnxt_ethdev.c

@@ -4113,8 +4113,9 @@ static int bnxt_restore_filters(struct bnxt *bp)
 	if (ret)
 		return ret;
 
+	/* if vlans are already programmed, this can fail with -EEXIST */
 	ret = bnxt_restore_vlan_filters(bp);
-	if (ret)
+	if (ret && ret != -EEXIST)
 		return ret;
 
 	ret = bnxt_restore_mcast_mac_filters(bp);