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net-gro: reset skb->truesize in napi_reuse_skb() 

[ Upstream commit e33d0ba804 ]

Recycling skb always had been very tough...

This time it appears GRO layer can accumulate skb->truesize
adjustments made by drivers when they attach a fragment to skb.

skb_gro_receive() can only subtract from skb->truesize the used part
of a fragment.

I spotted this problem seeing TcpExtPruneCalled and
TcpExtTCPRcvCollapsed that were unexpected with a recent kernel, where
TCP receive window should be sized properly to accept traffic coming
from a driver not overshooting skb->truesize.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2014-04-03 09:28:10 -07:00 committed by Greg Kroah-Hartman
parent 242339a25e
commit fc2ab6e8f4
1 changed files with 1 additions and 0 deletions
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1
net/core/dev.c
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@ -4051,6 +4051,7 @@ static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
skb->vlan_tci = 0;
skb->dev = napi->dev;
skb->skb_iif = 0;
skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
napi->skb = skb;
}