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Commit 3ccc6c6f authored by linzhang's avatar linzhang Committed by David S. Miller
Browse files

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: default avatarLin Zhang <xiaolou4617@gmail.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b3a703c7

net/core/skbuff.c

+3 −0
Original line number Diff line number Diff line
@@ -1719,6 +1719,8 @@ void *__pskb_pull_tail(struct sk_buff *skb, int delta) 
			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 @@ void *__pskb_pull_tail(struct sk_buff *skb, int delta) 
	}

	skb_shinfo(skb)->nr_frags = k;



end:

	skb->tail     += delta;

	skb->data_len -= delta;