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gro: Clean up tcpX_gro_receive checksum verification

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This patch simplifies the checksum verification in tcpX_gro_receive
by reusing the CHECKSUM_COMPLETE code for CHECKSUM_NONE.  All it
does for CHECKSUM_NONE is compute the partial checksum and then
treat it as if it came from the hardware (CHECKSUM_COMPLETE).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Cheers,
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2013-11-22 10:32:11 +08:00 committed by David S. Miller
parent cc5c00bbb4
commit b8ee93ba80
2 changed files with 20 additions and 33 deletions
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26
net/ipv4/tcp_offload.c
View File

@ -274,35 +274,29 @@ static struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *
{
const struct iphdr *iph = skb_gro_network_header(skb);
__wsum wsum;
__sum16 sum;
/* Don't bother verifying checksum if we're going to flush anyway. */
if (NAPI_GRO_CB(skb)->flush)
goto skip_csum;
wsum = skb->csum;
switch (skb->ip_summed) {
case CHECKSUM_NONE:
wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb),
0);
/* fall through */
case CHECKSUM_COMPLETE:
if (!tcp_v4_check(skb_gro_len(skb), iph->saddr, iph->daddr,
skb->csum)) {
wsum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
case CHECKSUM_NONE:
wsum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
skb_gro_len(skb), IPPROTO_TCP, 0);
sum = csum_fold(skb_checksum(skb,
skb_gro_offset(skb),
skb_gro_len(skb),
wsum));
if (sum)
goto flush;
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
skip_csum:

27
net/ipv6/tcpv6_offload.c
View File

@ -37,36 +37,29 @@ static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
{
const struct ipv6hdr *iph = skb_gro_network_header(skb);
__wsum wsum;
__sum16 sum;
/* Don't bother verifying checksum if we're going to flush anyway. */
if (NAPI_GRO_CB(skb)->flush)
goto skip_csum;
wsum = skb->csum;
switch (skb->ip_summed) {
case CHECKSUM_NONE:
wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb),
wsum);
/* fall through */
case CHECKSUM_COMPLETE:
if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
skb->csum)) {
wsum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
case CHECKSUM_NONE:
wsum = ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
skb_gro_len(skb),
IPPROTO_TCP, 0));
sum = csum_fold(skb_checksum(skb,
skb_gro_offset(skb),
skb_gro_len(skb),
wsum));
if (sum)
goto flush;
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
skip_csum: