| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 70/86] net-gro: reset skb->truesize in napi_reuse_skb() | Date | Wed, 28 May 2014 21:37:45 -0700 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet <edumazet@google.com>
[ 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> --- net/core/dev.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/core/dev.c +++ b/net/core/dev.c @@ -3898,6 +3898,7 @@ static void napi_reuse_skb(struct napi_s skb->vlan_tci = 0; skb->dev = napi->dev; skb->skb_iif = 0; + skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); napi->skb = skb; }
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