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authorEric Dumazet <edumazet@google.com>2014-04-03 09:28:10 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-31 13:20:39 -0700
commitfc2ab6e8f4903f3e2da6ea0a807403fc91f8debb (patch)
tree7944b2dbc66cc2d130b07d75a9c291b673af6a1f
parent242339a25ed829432d99e6571d170b308432ed55 (diff)
net-gro: reset skb->truesize in napi_reuse_skb()
[ Upstream commit e33d0ba8047b049c9262fdb1fcafb93cb52ceceb ] 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>
-rw-r--r--net/core/dev.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 62d29d94dbbf..fccc195e0fc8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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;
}