netdev - [PATCH v2 2/2] tg3: Allow for receive of full-size 8021AD frames

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Message-Id: <1411165389-21276-3-git-send-email-vyasevic@redhat.com>
Date:	Fri, 19 Sep 2014 18:23:09 -0400
From:	Vladislav Yasevich <vyasevich@...il.com>
To:	netdev@...r.kernel.org
Cc:	Vladislav Yasevich <vyasevic@...hat.com>,
	Prashant Sreedharan <prashant@...adcom.com>,
	Michael Chan <mchan@...adcom.com>
Subject: [PATCH v2 2/2] tg3: Allow for receive of full-size 8021AD frames

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 receiving full
sized frames.

Suggested-by: Prashant Sreedharan <prashant@...adcom.com>
CC: Prashant Sreedharan <prashant@...adcom.com>
CC: Michael Chan <mchan@...adcom.com>
Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
---
 drivers/net/ethernet/broadcom/tg3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 0a0938d..4f674f9 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6918,7 +6918,8 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
 		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)) {
 			dev_kfree_skb_any(skb);
 			goto drop_it_no_recycle;
 		}
-- 
1.9.3

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