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tcp: add tcp_tsopt_ecr_before helper 

a helper to prepare the main RACK patch

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2015-10-16 21:57:44 -07:00 committed by David S. Miller
parent af82f4e848
commit 77c631273d
1 changed files with 7 additions and 2 deletions
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9
net/ipv4/tcp_input.c
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@ -2250,14 +2250,19 @@ static inline void tcp_moderate_cwnd(struct tcp_sock *tp)
tp->snd_cwnd_stamp = tcp_time_stamp; tp->snd_cwnd_stamp = tcp_time_stamp;
} }
static bool tcp_tsopt_ecr_before(const struct tcp_sock *tp, u32 when)
{
return tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr &&
before(tp->rx_opt.rcv_tsecr, when);
}
/* Nothing was retransmitted or returned timestamp is less /* Nothing was retransmitted or returned timestamp is less
* than timestamp of the first retransmission. * than timestamp of the first retransmission.
*/ */
static inline bool tcp_packet_delayed(const struct tcp_sock *tp) static inline bool tcp_packet_delayed(const struct tcp_sock *tp)
{ {
return !tp->retrans_stamp || return !tp->retrans_stamp ||
(tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr && tcp_tsopt_ecr_before(tp, tp->retrans_stamp);
before(tp->rx_opt.rcv_tsecr, tp->retrans_stamp));
} }
/* Undo procedures. */ /* Undo procedures. */