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| author | Eric Dumazet <edumazet@google.com> | 2012-10-05 20:43:30 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-28 10:56:16 -0700 |
| commit | b50a0bdfd24cf4e3b0551fa6ae2791692231776a (patch) | |
| tree | 38ad93fcb625a19562a500d24c2abad507096447 | |
| parent | ea89601ac85f4d90f1aab99801647423bd3ca069 (diff) | |
| download | linux-stable-b50a0bdfd24cf4e3b0551fa6ae2791692231776a.tar.gz linux-stable-b50a0bdfd24cf4e3b0551fa6ae2791692231776a.tar.bz2 linux-stable-b50a0bdfd24cf4e3b0551fa6ae2791692231776a.zip | |
ipv6: GRO should be ECN friendly
[ Upstream commit 51ec04038c113a811b177baa85d293feff9ce995 ]
IPv4 side of the problem was addressed in commit a9e050f4e7f9d
(net: tcp: GRO should be ECN friendly)
This patch does the same, but for IPv6 : A Traffic Class mismatch
doesnt mean flows are different, but instead should force a flush
of previous packets.
This patch removes artificial packet reordering problem.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv6/af_inet6.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index e22e6d88bac6..f757e3b7cfbf 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -880,22 +880,25 @@ static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, nlen = skb_network_header_len(skb); for (p = *head; p; p = p->next) { - struct ipv6hdr *iph2; + const struct ipv6hdr *iph2; + __be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */ if (!NAPI_GRO_CB(p)->same_flow) continue; iph2 = ipv6_hdr(p); + first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ; - /* All fields must match except length. */ + /* All fields must match except length and Traffic Class. */ if (nlen != skb_network_header_len(p) || - memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || + (first_word & htonl(0xF00FFFFF)) || memcmp(&iph->nexthdr, &iph2->nexthdr, nlen - offsetof(struct ipv6hdr, nexthdr))) { NAPI_GRO_CB(p)->same_flow = 0; continue; } - + /* flush if Traffic Class fields are different */ + NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000)); NAPI_GRO_CB(p)->flush |= flush; } |