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authorHerbert Xu <herbert@gondor.apana.org.au>2008-12-15 23:43:36 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-15 23:43:36 -0800
commitbf296b125b21b8d558ceb6ec30bb4eba2730cd6b (patch)
tree5a06714c4001ccf1b217b888121f30d57fceea6d /net/ipv4/tcp_ipv4.c
parent71d93b39e52e92aea35f1058d957cf12250d0b75 (diff)
downloadlinux-bf296b125b21b8d558ceb6ec30bb4eba2730cd6b.tar.bz2
tcp: Add GRO support
This patch adds the TCP-specific portion of GRO. The criterion for merging is extremely strict (the TCP header must match exactly apart from the checksum) so as to allow refragmentation. Otherwise this is pretty much identical to LRO, except that we support the merging of ECN packets. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 26b9030747cc..10172487921b 100644
--- 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,