tcp: Add GRO support

[linux-2.6-omap-h63xx.git] / net / ipv4 / tcp_ipv4.c

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 26b9030747cc97b61eeca8554ca6792863a9d6fe..10172487921b944d3f82b1d527b4674a9af449a4 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2346,6 +2346,41 @@ void tcp4_proc_exit(void)
 }
 #endif /* CONFIG_PROC_FS */
 
+struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+       struct iphdr *iph = ip_hdr(skb);
+
+       switch (skb->ip_summed) {
+       case CHECKSUM_COMPLETE:
+               if (!tcp_v4_check(skb->len, iph->saddr, iph->daddr,
+                                 skb->csum)) {
+                       skb->ip_summed = CHECKSUM_UNNECESSARY;
+                       break;
+               }
+
+               /* fall through */
+       case CHECKSUM_NONE:
+               NAPI_GRO_CB(skb)->flush = 1;
+               return NULL;
+       }
+
+       return tcp_gro_receive(head, skb);
+}
+EXPORT_SYMBOL(tcp4_gro_receive);
+
+int tcp4_gro_complete(struct sk_buff *skb)
+{
+       struct iphdr *iph = ip_hdr(skb);
+       struct tcphdr *th = tcp_hdr(skb);
+
+       th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
+                                 iph->saddr, iph->daddr, 0);
+       skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+
+       return tcp_gro_complete(skb);
+}
+EXPORT_SYMBOL(tcp4_gro_complete);
+
 struct proto tcp_prot = {
        .name                   = "TCP",
        .owner                  = THIS_MODULE,