mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
udp: Offload outer UDP tunnel csum if available
In __skb_udp_tunnel_segment if outer UDP checksums are enabled and ip_summed is not already CHECKSUM_PARTIAL, set up checksum offload if device features allow it. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
63487babf0
commit
4bcb877d25
1 changed files with 35 additions and 15 deletions
|
@ -29,7 +29,7 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
|
|||
netdev_features_t features,
|
||||
struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
|
||||
netdev_features_t features),
|
||||
__be16 new_protocol)
|
||||
__be16 new_protocol, bool is_ipv6)
|
||||
{
|
||||
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
||||
u16 mac_offset = skb->mac_header;
|
||||
|
@ -39,7 +39,9 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
|
|||
netdev_features_t enc_features;
|
||||
int udp_offset, outer_hlen;
|
||||
unsigned int oldlen;
|
||||
bool need_csum;
|
||||
bool need_csum = !!(skb_shinfo(skb)->gso_type &
|
||||
SKB_GSO_UDP_TUNNEL_CSUM);
|
||||
bool offload_csum = false, dont_encap = need_csum;
|
||||
|
||||
oldlen = (u16)~skb->len;
|
||||
|
||||
|
@ -52,10 +54,12 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
|
|||
skb_set_network_header(skb, skb_inner_network_offset(skb));
|
||||
skb->mac_len = skb_inner_network_offset(skb);
|
||||
skb->protocol = new_protocol;
|
||||
skb->encap_hdr_csum = need_csum;
|
||||
|
||||
need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
|
||||
if (need_csum)
|
||||
skb->encap_hdr_csum = 1;
|
||||
/* Try to offload checksum if possible */
|
||||
offload_csum = !!(need_csum &&
|
||||
(skb->dev->features &
|
||||
(is_ipv6 ? NETIF_F_V6_CSUM : NETIF_F_V4_CSUM)));
|
||||
|
||||
/* segment inner packet. */
|
||||
enc_features = skb->dev->hw_enc_features & features;
|
||||
|
@ -72,11 +76,21 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
|
|||
do {
|
||||
struct udphdr *uh;
|
||||
int len;
|
||||
__be32 delta;
|
||||
|
||||
skb_reset_inner_headers(skb);
|
||||
skb->encapsulation = 1;
|
||||
if (dont_encap) {
|
||||
skb->encapsulation = 0;
|
||||
skb->ip_summed = CHECKSUM_NONE;
|
||||
} else {
|
||||
/* Only set up inner headers if we might be offloading
|
||||
* inner checksum.
|
||||
*/
|
||||
skb_reset_inner_headers(skb);
|
||||
skb->encapsulation = 1;
|
||||
}
|
||||
|
||||
skb->mac_len = mac_len;
|
||||
skb->protocol = protocol;
|
||||
|
||||
skb_push(skb, outer_hlen);
|
||||
skb_reset_mac_header(skb);
|
||||
|
@ -86,19 +100,25 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
|
|||
uh = udp_hdr(skb);
|
||||
uh->len = htons(len);
|
||||
|
||||
if (need_csum) {
|
||||
__be32 delta = htonl(oldlen + len);
|
||||
if (!need_csum)
|
||||
continue;
|
||||
|
||||
uh->check = ~csum_fold((__force __wsum)
|
||||
((__force u32)uh->check +
|
||||
(__force u32)delta));
|
||||
delta = htonl(oldlen + len);
|
||||
|
||||
uh->check = ~csum_fold((__force __wsum)
|
||||
((__force u32)uh->check +
|
||||
(__force u32)delta));
|
||||
|
||||
if (offload_csum) {
|
||||
skb->ip_summed = CHECKSUM_PARTIAL;
|
||||
skb->csum_start = skb_transport_header(skb) - skb->head;
|
||||
skb->csum_offset = offsetof(struct udphdr, check);
|
||||
} else {
|
||||
uh->check = gso_make_checksum(skb, ~uh->check);
|
||||
|
||||
if (uh->check == 0)
|
||||
uh->check = CSUM_MANGLED_0;
|
||||
}
|
||||
|
||||
skb->protocol = protocol;
|
||||
} while ((skb = skb->next));
|
||||
out:
|
||||
return segs;
|
||||
|
@ -134,7 +154,7 @@ struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
|
|||
}
|
||||
|
||||
segs = __skb_udp_tunnel_segment(skb, features, gso_inner_segment,
|
||||
protocol);
|
||||
protocol, is_ipv6);
|
||||
|
||||
out_unlock:
|
||||
rcu_read_unlock();
|
||||
|
|
Loading…
Reference in a new issue