Messages in this thread Patch in this message | | | From | Kamal Mostafa <> | Subject | [PATCH 3.8 076/121] net-gro: reset skb->truesize in napi_reuse_skb() | Date | Tue, 17 Jun 2014 09:17:34 -0700 |
| |
3.8.13.24 -stable review patch. If anyone has any objections, please let me know.
------------------
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: Kamal Mostafa <kamal@canonical.com> --- net/core/dev.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/core/dev.c b/net/core/dev.c index 69ba30b..df036ec 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3797,6 +3797,7 @@ 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; } -- 1.9.1
| |