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[TCP]: congestion control API pass RTT in microseconds

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This patch changes the API for the callback that is done after an ACK is
received. It solves a couple of issues:

  * Some congestion controls want higher resolution value of RTT
    (controlled by TCP_CONG_RTT_SAMPLE flag). These don't really want a ktime, but
    all compute a RTT in microseconds.

  * Other congestion control could use RTT at jiffies resolution.

To keep API consistent the units should be the same for both cases, just the
resolution should change.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2007-07-25 23:49:34 -07:00
committed by David S. Miller
parent 6a302358d8
commit 30cfd0baf0
12 changed files with 39 additions and 29 deletions
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4
net/ipv4/tcp_yeah.c
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@@ -58,7 +58,7 @@ static void tcp_yeah_init(struct sock *sk)
}
static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked, ktime_t last)
static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked, s32 rtt_us)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct yeah *yeah = inet_csk_ca(sk);
@@ -66,7 +66,7 @@ static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked, ktime_t last)
if (icsk->icsk_ca_state == TCP_CA_Open)
yeah->pkts_acked = pkts_acked;
tcp_vegas_pkts_acked(sk, pkts_acked, last);
tcp_vegas_pkts_acked(sk, pkts_acked, rtt_us);
}
static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack,