Eric Dumazet wrote, at 06/14/2010 05:02 PM:
> Instead of doing one atomic operation per frag, we can factorize them.
>
> Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
IPv6 netfilter has implemented owns queue to manage/reassemble defragments.
So, you miss this one.
[PATCH 1/2] netfilter: defrag: remove one redundant atomic ops
Instead of doing one atomic operation per frag, we can factorize them.
Reported from Eric Dumazet.
Signed-off-by: Shan Wei <shanwei@xxxxxxxxxxxxxx>
---
net/ipv6/netfilter/nf_conntrack_reasm.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 6fb8901..bc5b86d 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -442,7 +442,6 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
skb_shinfo(head)->frag_list = head->next;
skb_reset_transport_header(head);
skb_push(head, head->data - skb_network_header(head));
- atomic_sub(head->truesize, &nf_init_frags.mem);
for (fp=head->next; fp; fp = fp->next) {
head->data_len += fp->len;
@@ -452,8 +451,8 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
else if (head->ip_summed == CHECKSUM_COMPLETE)
head->csum = csum_add(head->csum, fp->csum);
head->truesize += fp->truesize;
- atomic_sub(fp->truesize, &nf_init_frags.mem);
}
+ atomic_sub(head->truesize, &nf_init_frags.mem);
head->next = NULL;
head->dev = dev;
--
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