diff options
| author |   Eric Dumazet <edumazet@google.com> | 2016-04-30 10:19:29 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-05-03 00:22:19 -0400 |
| commit | 9580bf2edb402b3afaf9c5a4efb6953f993ef52e (patch) | |
| tree | ead375015918eb32b6ad7cb73a00a5567b8378ed | |
| parent | netdevice: shrink size of struct netdev_queue (diff) | |
| download | linux-dev-9580bf2edb402b3afaf9c5a4efb6953f993ef52e.tar.xz linux-dev-9580bf2edb402b3afaf9c5a4efb6953f993ef52e.zip | |
net: relax expensive skb_unclone() in iptunnel_handle_offloads()
Locally generated TCP GSO packets having to go through a GRE/SIT/IPIP
tunnel have to go through an expensive skb_unclone()
Reallocating skb->head is a lot of work.
Test should really check if a 'real clone' of the packet was done.
TCP does not care if the original gso_type is changed while the packet
travels in the stack.
This adds skb_header_unclone() which is a variant of skb_clone()
using skb_header_cloned() check instead of skb_cloned().
This variant can probably be used from other points.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/skbuff.h | 10 | ||||
| -rw-r--r-- | net/ipv4/ip_tunnel_core.c | 2 |
2 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index c84a5a1078c5..c413c588a24f 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1325,6 +1325,16 @@ static inline int skb_header_cloned(const struct sk_buff *skb) return dataref != 1; } +static inline int skb_header_unclone(struct sk_buff *skb, gfp_t pri) +{ + might_sleep_if(gfpflags_allow_blocking(pri)); + + if (skb_header_cloned(skb)) + return pskb_expand_head(skb, 0, 0, pri); + + return 0; +} + /** * skb_header_release - release reference to header * @skb: buffer to operate on diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c index 786fa7ca28e0..9118b0e640ba 100644 --- a/net/ipv4/ip_tunnel_core.c +++ b/net/ipv4/ip_tunnel_core.c @@ -157,7 +157,7 @@ int iptunnel_handle_offloads(struct sk_buff *skb, } if (skb_is_gso(skb)) { - err = skb_unclone(skb, GFP_ATOMIC); + err = skb_header_unclone(skb, GFP_ATOMIC); if (unlikely(err)) return err; skb_shinfo(skb)->gso_type |= gso_type_mask; |