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gianfar: prevent buggy hw rx vlan tagging

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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>
This commit is contained in:
Jiri Pirko 2011-08-10 01:19:48 +00:00 committed by David S. Miller
parent 6a27cdeddf
commit 32f7fd44ce
1 changed files with 7 additions and 2 deletions
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9
drivers/net/gianfar.c
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@ -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 */