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authorlinzhang <xiaolou4617@gmail.com>2017-07-17 11:25:02 +0200
committerDavid S. Miller <davem@davemloft.net>2017-07-17 17:56:50 +0200
commit3ccc6c6faaa93da70989177b91c7c3ef0df10937 (patch)
tree4fcc27c0a605eae9a6a8740d5933c6030fc9837a /net
parentdt-bindings: net: ravb : Add support for r8a7743 SoC (diff)
downloadlinux-3ccc6c6faaa93da70989177b91c7c3ef0df10937.tar.xz
linux-3ccc6c6faaa93da70989177b91c7c3ef0df10937.zip
skbuff: optimize the pull_pages code in __pskb_pull_tail()
In the pull_pages code block, if the first frag size > eat, we can end the loop in advance to avoid extra copy. Signed-off-by: Lin Zhang <xiaolou4617@gmail.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/skbuff.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 8b11341ed69a..b352c6bcfb31 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1719,6 +1719,8 @@ pull_pages:
if (eat) {
skb_shinfo(skb)->frags[k].page_offset += eat;
skb_frag_size_sub(&skb_shinfo(skb)->frags[k], eat);
+ if (!i)
+ goto end;
eat = 0;
}
k++;
@@ -1726,6 +1728,7 @@ pull_pages:
}
skb_shinfo(skb)->nr_frags = k;
+end:
skb->tail += delta;
skb->data_len -= delta;