From: Eric Dumazet <edumazet@google.com>
Date: Thu, 3 Apr 2014 16:28:10 +0000 (-0700)
Subject: net-gro: reset skb->truesize in napi_reuse_skb()
X-Git-Tag: v3.15-rc1~47^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e33d0ba8047b049c9262fdb1fcafb93cb52ceceb;p=pandora-kernel.git

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

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>
---

Reading git-diff-tree failed