Messages in this thread Patch in this message | | | Date | Fri, 30 Mar 2012 12:50:52 -0700 | From | Greg KH <> | Subject | [ 139/149] net: fix napi_reuse_skb() skb reserve |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet <eric.dumazet@gmail.com>
[ Upstream commit 2a2a459eeeff48640dc557548ce576d666ab06ed ]
napi->skb is allocated in napi_get_frags() using netdev_alloc_skb_ip_align(), with a reserve of NET_SKB_PAD + NET_IP_ALIGN bytes.
However, when such skb is recycled in napi_reuse_skb(), it ends with a reserve of NET_IP_ALIGN which is suboptimal.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/core/dev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/core/dev.c +++ b/net/core/dev.c @@ -3634,7 +3634,8 @@ EXPORT_SYMBOL(napi_gro_receive); static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) { __skb_pull(skb, skb_headlen(skb)); - skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); + /* restore the reserve we had after netdev_alloc_skb_ip_align() */ + skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); skb->vlan_tci = 0; skb->dev = napi->dev; skb->skb_iif = 0;
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