net: allow multiple dev per napi with GRO

GRO assumes that there is a one-to-one relationship between NAPI
structure and network device. Some devices like sky2 share multiple
devices on a single interrupt so only have one NAPI handler. Rather than
split GRO from NAPI, just have GRO assume if device changes that
it is a different flow.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 52fea5b28ca6..91d792d17e09 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2472,8 +2472,9 @@ static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
                 return GRO_NORMAL;
 
         for (p = napi->gro_list; p; p = p->next) {
-                NAPI_GRO_CB(p)->same_flow = !compare_ether_header(
-                        skb_mac_header(p), skb_gro_mac_header(skb));
+                NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev)
+                        && !compare_ether_header(skb_mac_header(p),
+                                                 skb_gro_mac_header(skb));
                 NAPI_GRO_CB(p)->flush = 0;
         }