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tcp: new helper tcp_rack_skb_timeout

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Create and export a new helper tcp_rack_skb_timeout and move tcp_is_rack
to prepare the final RTO change.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2018-05-16 16:40:16 -07:00 • committed by David S. Miller
parent c77d62ffae
commit b8fef65a8a
3 changed files with 14 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

9
net/ipv4/tcp_recovery.c
View file

@ -47,6 +47,12 @@ u32 tcp_rack_reo_wnd(const struct sock *sk)
tp->srtt_us >> 3);
}
s32 tcp_rack_skb_timeout(struct tcp_sock *tp, struct sk_buff *skb, u32 reo_wnd)
{
return tp->rack.rtt_us + reo_wnd -
tcp_stamp_us_delta(tp->tcp_mstamp, skb->skb_mstamp);
}
/* RACK loss detection (IETF draft draft-ietf-tcpm-rack-01):
*
* Marks a packet lost, if some packet sent later has been (s)acked.
@ -92,8 +98,7 @@ static void tcp_rack_detect_loss(struct sock *sk, u32 *reo_timeout)
/* A packet is lost if it has not been s/acked beyond
* the recent RTT plus the reordering window.
*/
remaining = tp->rack.rtt_us + reo_wnd -
tcp_stamp_us_delta(tp->tcp_mstamp, skb->skb_mstamp);
remaining = tcp_rack_skb_timeout(tp, skb, reo_wnd);
if (remaining <= 0) {
tcp_mark_skb_lost(sk, skb);
list_del_init(&skb->tcp_tsorted_anchor);