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tcp: Add GRO support

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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>
This commit is contained in:
Herbert Xu 2008-12-15 23:43:36 -08:00 • committed by David S. Miller
parent 71d93b39e5
commit bf296b125b
4 changed files with 143 additions and 0 deletions
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35
net/ipv4/tcp_ipv4.c
View file

@ -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,