gianfar: prevent buggy hw rx vlan tagging

On some buggy chips, "vlan tag present" flag is set which causes packet
loss. Fix this by checking if rx vlan accel is enabled in features.

Reported-by: Michael Guntsche <mguntsche@gmail.com>
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 2659daad783d..31d5c574e5a9 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -2710,8 +2710,13 @@ static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
         /* Tell the skb what kind of packet this is */
         skb->protocol = eth_type_trans(skb, dev);
 
-        /* Set vlan tag */
-        if (fcb->flags & RXFCB_VLN)
+        /*
+         * There's need to check for NETIF_F_HW_VLAN_RX here.
+         * Even if vlan rx accel is disabled, on some chips
+         * RXFCB_VLN is pseudo randomly set.
+         */
+        if (dev->features & NETIF_F_HW_VLAN_RX &&
+            fcb->flags & RXFCB_VLN)
                 __vlan_hwaccel_put_tag(skb, fcb->vlctl);
 
         /* Send the packet up the stack */