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tcp: fix tcp_rearm_rto()

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skbs in (re)transmit queue no longer have a copy of jiffies
at the time of the transmit : skb->skb_mstamp is now in usec unit,
with no correlation to tcp_jiffies32.

We have to convert rto from jiffies to usec, compute a time difference
in usec, then convert the delta to HZ units.

Fixes: 9a568de481 ("tcp: switch TCP TS option (RFC 7323) to 1ms clock")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-05-18 09:15:58 -07:00 committed by David S. Miller
parent 4454e8661f
commit b17b8a20c5
1 changed files with 6 additions and 6 deletions
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12
net/ipv4/tcp_input.c
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@ -3002,14 +3002,14 @@ void tcp_rearm_rto(struct sock *sk)
if (icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
struct sk_buff *skb = tcp_write_queue_head(sk);
const u32 rto_time_stamp =
tcp_skb_timestamp(skb) + rto;
s32 delta = (s32)(rto_time_stamp - tcp_jiffies32);
/* delta may not be positive if the socket is locked
u64 rto_time_stamp = skb->skb_mstamp +
jiffies_to_usecs(rto);
s64 delta_us = rto_time_stamp - tp->tcp_mstamp;
/* delta_us may not be positive if the socket is locked
* when the retrans timer fires and is rescheduled.
*/
if (delta > 0)
rto = delta;
if (delta_us > 0)
rto = usecs_to_jiffies(delta_us);
}
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, rto,
TCP_RTO_MAX);