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| author | Tom Herbert <therbert@google.com> | 2014-08-31 15:12:43 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-01 21:36:28 -0700 |
| commit | 2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3 (patch) | |
| tree | 9bf6029678d74ef6ad12e832d48d769caf88a4ed /net/ipv6/udp_offload.c | |
| parent | d96535a17dbbafd567961d14c08c0984ddda9c3c (diff) | |
| download | linux-2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3.tar.gz linux-2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3.tar.bz2 linux-2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3.zip | |
udp: Add support for doing checksum unnecessary conversion
Add support for doing CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE
conversion in UDP tunneling path.
In the normal UDP path, we call skb_checksum_try_convert after locating
the UDP socket. The check is that checksum conversion is enabled for
the socket (new flag in UDP socket) and that checksum field is
non-zero.
In the UDP GRO path, we call skb_gro_checksum_try_convert after
checksum is validated and checksum field is non-zero. Since this is
already in GRO we assume that checksum conversion is always wanted.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp_offload.c')
| -rw-r--r-- | net/ipv6/udp_offload.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index b13e377e9c53..89cb9a9b8537 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -134,16 +134,26 @@ static struct sk_buff **udp6_gro_receive(struct sk_buff **head, { struct udphdr *uh = udp_gro_udphdr(skb); + if (unlikely(!uh)) + goto flush; + /* Don't bother verifying checksum if we're going to flush anyway. */ - if (unlikely(!uh) || - (!NAPI_GRO_CB(skb)->flush && - skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, - ip6_gro_compute_pseudo))) { - NAPI_GRO_CB(skb)->flush = 1; - return NULL; - } + if (!NAPI_GRO_CB(skb)->flush) + goto skip; + if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, + ip6_gro_compute_pseudo)) + goto flush; + else if (uh->check) + skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check, + ip6_gro_compute_pseudo); + +skip: return udp_gro_receive(head, skb, uh); + +flush: + NAPI_GRO_CB(skb)->flush = 1; + return NULL; } int udp6_gro_complete(struct sk_buff *skb, int nhoff) |