GRO: Move netpoll checks to correct location

As my netpoll fix for net doesn't really work for net-next, we
need this update to move the checks into the right place.  As it
stands we may pass freed skbs to netpoll_receive_skb.

This patch also introduces a netpoll_rx_on function to avoid GRO
completely if we're invoked through netpoll.  This might seem
paranoid but as netpoll may have an external receive hook it's
better to be safe than sorry.  I don't think we need this for
2.6.29 though since there's nothing immediately broken by it.

This patch also moves the GRO_* return values to netdevice.h since
VLAN needs them too (I tried to avoid this originally but alas
this seems to be the easiest way out).  This fixes a bug in VLAN
where it continued to use the old return value 2 instead of the
correct GRO_DROP.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -135,14 +135,6 @@
 /* This should be increased if a protocol with a bigger head is added. */
 #define GRO_MAX_HEAD (MAX_HEADER + 128)
 
-enum {
-	GRO_MERGED,
-	GRO_MERGED_FREE,
-	GRO_HELD,
-	GRO_NORMAL,
-	GRO_DROP,
-};
-
 /*
  *	The list of packet types we will receive (as opposed to discard)
  *	and the routines to invoke.
@@ -2474,6 +2466,9 @@ static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
 	struct sk_buff *p;
 
+	if (netpoll_rx_on(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));
@@ -2487,9 +2482,6 @@ int napi_skb_finish(int ret, struct sk_buff *skb)
 {
 	int err = NET_RX_SUCCESS;
 
-	if (netpoll_receive_skb(skb))
-		return NET_RX_DROP;
-
 	switch (ret) {
 	case GRO_NORMAL:
 		return netif_receive_skb(skb);
@@ -2587,9 +2579,6 @@ int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, int ret)
 {
 	int err = NET_RX_SUCCESS;
 
-	if (netpoll_receive_skb(skb))
-		return NET_RX_DROP;
-
 	switch (ret) {
 	case GRO_NORMAL:
 	case GRO_HELD: