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tcp: convert retransmit_cnt_hint to seqno

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Main benefit in this is that we can then freely point
the retransmit_skb_hint to anywhere we want to because
there's no longer need to know what would be the count
changes involve, and since this is really used only as a
terminator, unnecessary work is one time walk at most,
and if some retransmissions are necessary after that
point later on, the walk is not full waste of time
anyway.

Since retransmit_high must be kept valid, all lost
markers must ensure that.

Now I also have learned how those "holes" in the
rexmittable skbs can appear, mtu probe does them. So
I removed the misleading comment as well.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2008-09-20 21:20:20 -07:00 • committed by David S. Miller
parent 41ea36e35a
commit 006f582c73
4 changed files with 30 additions and 33 deletions
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2
include/net/tcp.h
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@ -472,6 +472,8 @@ extern void tcp_send_delayed_ack(struct sock *sk);
/* tcp_input.c */
extern void tcp_cwnd_application_limited(struct sock *sk);
extern void tcp_skb_mark_lost_uncond_verify(struct tcp_sock *tp,
struct sk_buff *skb);
/* tcp_timer.c */
extern void tcp_init_xmit_timers(struct sock *);