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net: cleanup and document skb fclone layout

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Lets use a proper structure to clearly document and implement
skb fast clones.

Then, we might experiment more easily alternative layouts.

This patch adds a new skb_fclone_busy() helper, used by tcp and xfrm,
to stop leaking of implementation details.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2014-09-29 13:29:15 -07:00
committed by David S. Miller
parent b248230c34
commit d0bf4a9e92
4 changed files with 47 additions and 28 deletions
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5
net/ipv4/tcp_output.c
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@@ -2110,10 +2110,7 @@ bool tcp_schedule_loss_probe(struct sock *sk)
static bool skb_still_in_host_queue(const struct sock *sk,
const struct sk_buff *skb)
{
const struct sk_buff *fclone = skb + 1;
if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
fclone->fclone == SKB_FCLONE_CLONE)) {
if (unlikely(skb_fclone_busy(skb))) {
NET_INC_STATS_BH(sock_net(sk),
LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES);
return true;