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udp: add udp gso

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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>
This commit is contained in:
Willem de Bruijn
2018-04-26 13:42:16 -04:00
committed by David S. Miller
parent 1cd7884dfd
commit ee80d1ebe5
6 changed files with 82 additions and 4 deletions
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19
net/ipv6/udp_offload.c
View File

@@ -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.
*/