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    Subject[PATCH 3.8 076/121] net-gro: reset skb->truesize in napi_reuse_skb()
    Date
    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


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