diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2013-11-22 03:32:11 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-23 23:46:19 +0100 |
| commit | b8ee93ba80b5a0b6c3c06b65c34dd1276f16c047 (patch) | |
| tree | 11f6e9c6ef60f51391b9a4564c0f285fab23da97 /net/ipv4/tcp_offload.c | |
| parent | gro: Only verify TCP checksums for candidates (diff) | |
| download | linux-b8ee93ba80b5a0b6c3c06b65c34dd1276f16c047.tar.xz linux-b8ee93ba80b5a0b6c3c06b65c34dd1276f16c047.zip | |
gro: Clean up tcpX_gro_receive checksum verification
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>
Diffstat (limited to 'net/ipv4/tcp_offload.c')
| -rw-r--r-- | net/ipv4/tcp_offload.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c index 55aeec930140..05606353c7e7 100644 --- a/net/ipv4/tcp_offload.c +++ b/net/ipv4/tcp_offload.c @@ -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: |