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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-07-26 08:49:34 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-31 11:27:57 +0200 |
| commit | 30cfd0baf0a0c4329fff1ef4b622919297969ec8 (patch) | |
| tree | 945a72f636ced1b443d894495704237e4cb7816d /net/ipv4/tcp_veno.c | |
| parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6.23 (diff) | |
| download | linux-30cfd0baf0a0c4329fff1ef4b622919297969ec8.tar.xz linux-30cfd0baf0a0c4329fff1ef4b622919297969ec8.zip | |
[TCP]: congestion control API pass RTT in microseconds
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>
Diffstat (limited to 'net/ipv4/tcp_veno.c')
| -rw-r--r-- | net/ipv4/tcp_veno.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/tcp_veno.c b/net/ipv4/tcp_veno.c index 7a55ddf86032..8fb2aee0b1a4 100644 --- a/net/ipv4/tcp_veno.c +++ b/net/ipv4/tcp_veno.c @@ -69,16 +69,16 @@ static void tcp_veno_init(struct sock *sk) } /* Do rtt sampling needed for Veno. */ -static void tcp_veno_pkts_acked(struct sock *sk, u32 cnt, ktime_t last) +static void tcp_veno_pkts_acked(struct sock *sk, u32 cnt, s32 rtt_us) { struct veno *veno = inet_csk_ca(sk); u32 vrtt; - if (ktime_equal(last, net_invalid_timestamp())) + if (rtt_us < 0) return; /* Never allow zero rtt or baseRTT */ - vrtt = ktime_to_us(net_timedelta(last)) + 1; + vrtt = rtt_us + 1; /* Filter to find propagation delay: */ if (vrtt < veno->basertt) |