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 <herbert@gondor.apana.org.au>
---
net/core/skbuff.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6ecb8d7..d7efaf9 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2594,9 +2594,11 @@ 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 -=
--
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