[PATCH 3.10 08/16] tg3: Allow for recieve of full-size 8021AD frames

From: Greg Kroah-Hartman
Date: Sun Oct 12 2014 - 23:00:40 EST

3.10-stable review patch. If anyone has any objections, please let me know.


From: Vlad Yasevich <vyasevich@xxxxxxxxx>

[ Upstream commit 7d3083ee36b51e425b6abd76778a2046906b0fd3 ]

When receiving a vlan-tagged frame that still contains
a vlan header, the length of the packet will be greater
then MTU+ETH_HLEN since it will account of the extra
vlan header. TG3 checks this for the case for 802.1Q,
but not for 802.1ad. As a result, full sized 802.1ad
frames get dropped by the card.

Add a check for 802.1ad protocol when receving full
sized frames.

Suggested-by: Prashant Sreedharan <prashant@xxxxxxxxxxxx>
CC: Prashant Sreedharan <prashant@xxxxxxxxxxxx>
CC: Michael Chan <mchan@xxxxxxxxxxxx>
Signed-off-by: Vladislav Yasevich <vyasevic@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/net/ethernet/broadcom/tg3.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6767,7 +6767,8 @@ static int tg3_rx(struct tg3_napi *tnapi
skb->protocol = eth_type_trans(skb, tp->dev);

if (len > (tp->dev->mtu + ETH_HLEN) &&
- skb->protocol != htons(ETH_P_8021Q)) {
+ skb->protocol != htons(ETH_P_8021Q) &&
+ skb->protocol != htons(ETH_P_8021AD)) {
goto drop_it_no_recycle;

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