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net: add rb_to_skb() and other rb tree helpers

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Geeralize private netem_rb_to_skb()

TCP rtx queue will soon be converted to rb-tree,
so we will need skb_rbtree_walk() helpers.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-10-05 22:21:21 -07:00
committed by David S. Miller
parent f5333f80c3
commit 18a4c0eab2
4 changed files with 37 additions and 36 deletions
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8
net/ipv4/tcp_fastopen.c
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@@ -465,17 +465,15 @@ bool tcp_fastopen_active_should_disable(struct sock *sk)
void tcp_fastopen_active_disable_ofo_check(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
struct rb_node *p;
struct sk_buff *skb;
struct dst_entry *dst;
struct sk_buff *skb;
if (!tp->syn_fastopen)
return;
if (!tp->data_segs_in) {
p = rb_first(&tp->out_of_order_queue);
if (p && !rb_next(p)) {
skb = rb_entry(p, struct sk_buff, rbnode);
skb = skb_rb_first(&tp->out_of_order_queue);
if (skb && !skb_rb_next(skb)) {
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) {
tcp_fastopen_active_disable(sk);
return;