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gro: Use gso_size to store MSS 

In order to allow GRO packets without frag_list at all, we need to
store the MSS in the packet itself.  The obvious place is gso_size.
The only thing to watch out for is if the packet ends up not being
GRO then we need to clear gso_size before pushing the packet into
the stack.

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 2009-01-04 16:13:19 -08:00 committed by David S. Miller
parent cfc3a44c3c
commit b530256d2e
3 changed files with 4 additions and 4 deletions
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2
net/core/dev.c
View File

@ -2365,6 +2365,7 @@ static int napi_gro_complete(struct sk_buff *skb)
}
out:
skb_shinfo(skb)->gso_size = 0;
__skb_push(skb, -skb_network_offset(skb));
return netif_receive_skb(skb);
}
@ -2446,6 +2447,7 @@ int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
}
NAPI_GRO_CB(skb)->count = 1;
skb_shinfo(skb)->gso_size = skb->len;
skb->next = napi->gro_list;
napi->gro_list = skb;

1
net/core/skbuff.c
View File

@ -2613,6 +2613,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
*NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);
skb_shinfo(nskb)->frag_list = p;
skb_shinfo(nskb)->gso_size = skb_shinfo(p)->gso_size;
skb_header_release(p);
nskb->prev = p;

5
net/ipv4/tcp.c
View File

@ -2519,9 +2519,7 @@ found:
flush |= memcmp(th + 1, th2 + 1, thlen - sizeof(*th));
total = p->len;
mss = total;
if (skb_shinfo(p)->frag_list)
mss = skb_shinfo(p)->frag_list->len;
mss = skb_shinfo(p)->gso_size;
flush |= skb->len > mss || skb->len <= 0;
flush |= ntohl(th2->seq) + total != ntohl(th->seq);
@ -2557,7 +2555,6 @@ int tcp_gro_complete(struct sk_buff *skb)
skb->csum_offset = offsetof(struct tcphdr, check);
skb->ip_summed = CHECKSUM_PARTIAL;
skb_shinfo(skb)->gso_size = skb_shinfo(skb)->frag_list->len;
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
if (th->cwr)