gro: Restore correct value to gso_size

Since everybody has been focusing on baremetal GRO performance
no one noticed when I added a bug that zapped gso_size for all
GRO packets.  This only gets picked up when you forward the skb
out of an interface.

Thanks to Mark Wagner for noticing this bug when testing kvm.

Reported-by: Mark Wagner <mwagner@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index ea8eb2214b09d92a8ccda0558fadcddac480e4fa..343883f65ea70a24f6548560e3358aac0f5335cf 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2328,8 +2328,10 @@ static int napi_gro_complete(struct sk_buff *skb)
        struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
        int err = -ENOENT;
 
-       if (NAPI_GRO_CB(skb)->count == 1)
+       if (NAPI_GRO_CB(skb)->count == 1) {
+               skb_shinfo(skb)->gso_size = 0;
                goto out;
+       }
 
        rcu_read_lock();
        list_for_each_entry_rcu(ptype, head, list) {
@@ -2348,7 +2350,6 @@ static int napi_gro_complete(struct sk_buff *skb)
        }
 
 out:
-       skb_shinfo(skb)->gso_size = 0;
        return netif_receive_skb(skb);
 }