diff options
| author |   Willem de Bruijn <willemb@google.com> | 2018-04-26 13:42:16 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-04-26 15:07:42 -0400 |
| commit | ee80d1ebe5ba7f4bd74959c873119175a4fc08d3 (patch) | |
| tree | 0bca8b68c30175a1f650f0230811d7edcd2ceed3 /net/ipv6/udp_offload.c | |
| parent | udp: expose inet cork to udp (diff) | |
| download | linux-dev-ee80d1ebe5ba7f4bd74959c873119175a4fc08d3.tar.xz linux-dev-ee80d1ebe5ba7f4bd74959c873119175a4fc08d3.zip | |
udp: add udp gso
Implement generic segmentation offload support for udp datagrams. A
follow-up patch adds support to the protocol stack to generate such
packets.
UDP GSO is not UFO. UFO fragments a single large datagram. GSO splits
a large payload into a number of discrete UDP datagrams.
The implementation adds a GSO type SKB_UDP_GSO_L4 to differentiate it
from UFO (SKB_UDP_GSO).
IPPROTO_UDPLITE is excluded, as that protocol has no gso handler
registered.
[ Export __udp_gso_segment for ipv6. -DaveM ]
Signed-off-by: Willem de Bruijn <willemb@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 | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index 2a04dc9c781b..f7b85b1e6b3e 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -17,6 +17,20 @@ #include <net/ip6_checksum.h> #include "ip6_offload.h" +static struct sk_buff *__udp6_gso_segment(struct sk_buff *gso_skb, + netdev_features_t features) +{ + const struct ipv6hdr *ip6h = ipv6_hdr(gso_skb); + unsigned int mss = skb_shinfo(gso_skb)->gso_size; + + if (!can_checksum_protocol(features, htons(ETH_P_IPV6))) + return ERR_PTR(-EIO); + + return __udp_gso_segment(gso_skb, features, mss, + udp_v6_check(sizeof(struct udphdr) + mss, + &ip6h->saddr, &ip6h->daddr, 0)); +} + static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, netdev_features_t features) { @@ -42,12 +56,15 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, const struct ipv6hdr *ipv6h; struct udphdr *uh; - if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP)) + if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4))) goto out; if (!pskb_may_pull(skb, sizeof(struct udphdr))) goto out; + if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) + return __udp6_gso_segment(skb, features); + /* Do software UFO. Complete and fill in the UDP checksum as HW cannot * do checksum of UDP packets sent as multiple IP fragments. */ |