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[net-next,resubmit] skbuff: optimize the pull_pages code in __pskb_pull_tail()

Message ID 1500258126-11235-1-git-send-email-xiaolou4617@gmail.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Lin Zhang July 17, 2017, 2:22 a.m. UTC 
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>
---
 net/core/skbuff.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index f990eb8..c00a1df 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1720,6 +1720,10 @@  void *__pskb_pull_tail(struct sk_buff *skb, int delta)
 				skb_shinfo(skb)->frags[k].page_offset += eat;
 				skb_frag_size_sub(&skb_shinfo(skb)->frags[k], eat);
 				eat = 0;
+				if (!i) {
+					k = skb_shinfo(skb)->nr_frags;
+					break;
+				}
 			}
 			k++;
 		}