From: Neal Cardwell <ncardwell@xxxxxxxxxx> commit a2815817ffa68c7933a43eb55836d6e789bd4389 upstream. Have tcp_schedule_loss_probe() base the TLP scheduling decision based on when the RTO *should* fire. This is to enable the upcoming xmit timer fix in this series, where tcp_schedule_loss_probe() cannot assume that the last timer installed was an RTO timer (because we are no longer doing the "rearm RTO, rearm RTO, rearm TLP" dance on every ACK). So tcp_schedule_loss_probe() must independently figure out when an RTO would want to fire. In the new TLP implementation following in this series, we cannot assume that icsk_timeout was set based on an RTO; after processing a cumulative ACK the icsk_timeout we see can be from a previous TLP or RTO. So we need to independently recalculate the RTO time (instead of reading it out of icsk_timeout). Removing this dependency on the nature of icsk_timeout makes things a little easier to reason about anyway. Note that the old and new code should be equivalent, since they are both saying: "if the RTO is in the future, but at an earlier time than the normal TLP time, then set the TLP timer to fire when the RTO would have fired". [This version of the commit was compiled and briefly tested based on top of v3.10.107.] Change-Id: I597ad6446edde15bf2cea8e56d603a2c52f8221b Fixes: 6ba8a3b19e76 ("tcp: Tail loss probe (TLP)") Signed-off-by: Neal Cardwell <ncardwell@xxxxxxxxxx> Signed-off-by: Yuchung Cheng <ycheng@xxxxxxxxxx> Signed-off-by: Nandita Dukkipati <nanditad@xxxxxxxxxx> Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx> Signed-off-by: Willy Tarreau <w@xxxxxx> --- net/ipv4/tcp_output.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 8729a93..1354402 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1947,8 +1947,8 @@ bool tcp_schedule_loss_probe(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); - u32 timeout, tlp_time_stamp, rto_time_stamp; u32 rtt = tp->srtt >> 3; + u32 timeout, rto_delta; if (WARN_ON(icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS)) return false; @@ -1987,14 +1987,10 @@ bool tcp_schedule_loss_probe(struct sock *sk) (rtt + (rtt >> 1) + TCP_DELACK_MAX)); timeout = max_t(u32, timeout, msecs_to_jiffies(10)); - /* If RTO is shorter, just schedule TLP in its place. */ - tlp_time_stamp = tcp_time_stamp + timeout; - rto_time_stamp = (u32)inet_csk(sk)->icsk_timeout; - if ((s32)(tlp_time_stamp - rto_time_stamp) > 0) { - s32 delta = rto_time_stamp - tcp_time_stamp; - if (delta > 0) - timeout = delta; - } + /* If the RTO formula yields an earlier time, then use that time. */ + rto_delta = tcp_rto_delta(sk); /* How far in future is RTO? */ + if (rto_delta > 0) + timeout = min_t(u32, timeout, rto_delta); inet_csk_reset_xmit_timer(sk, ICSK_TIME_LOSS_PROBE, timeout, TCP_RTO_MAX); -- 2.8.0.rc2.1.gbe9624a