From: Herbert Xu Date: Thu, 29 Jan 2009 14:19:51 +0000 (+0000) Subject: gro: Do not merge paged packets into frag_list X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=81705ad1b2f926d2ef15ed95074a9c1fa9fb4dc4;p=openwrt%2Fstaging%2Fblogic.git gro: Do not merge paged packets into frag_list gro: Do not merge paged packets into frag_list Bigger is not always better :) It was easy to continue to merged packets into frag_list after the page array is full. However, this turns out to be worse than LRO because frag_list is a much less efficient form of storage than the page array. So we're better off stopping the merge and starting a new entry with an empty page array. In future we can optimise this further by doing frag_list merging but making sure that we continue to fill in the page array. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- diff --git a/net/core/skbuff.c b/net/core/skbuff.c index f9f4065a7e9b..d386f1082ebd 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2591,9 +2591,11 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) if (skb_shinfo(p)->frag_list) goto merge; - else if (skb_headlen(skb) <= skb_gro_offset(skb) && - skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags <= - MAX_SKB_FRAGS) { + else if (skb_headlen(skb) <= skb_gro_offset(skb)) { + if (skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags > + MAX_SKB_FRAGS) + return -E2BIG; + skb_shinfo(skb)->frags[0].page_offset += skb_gro_offset(skb) - skb_headlen(skb); skb_shinfo(skb)->frags[0].size -=