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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-07-25 23:49:34 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-31 02:27:57 -0700 |
| commit | 30cfd0baf0a0c4329fff1ef4b622919297969ec8 (patch) | |
| tree | 945a72f636ced1b443d894495704237e4cb7816d /net/ipv4/tcp_westwood.c | |
| parent | 6a302358d87fedaf7bda12b8e909265ebf1ce674 (diff) | |
| download | linux-stable-30cfd0baf0a0c4329fff1ef4b622919297969ec8.tar.gz linux-stable-30cfd0baf0a0c4329fff1ef4b622919297969ec8.tar.bz2 linux-stable-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_westwood.c')
| -rw-r--r-- | net/ipv4/tcp_westwood.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/tcp_westwood.c b/net/ipv4/tcp_westwood.c index e61e09dd513e..20151d6a6241 100644 --- a/net/ipv4/tcp_westwood.c +++ b/net/ipv4/tcp_westwood.c @@ -100,11 +100,12 @@ static void westwood_filter(struct westwood *w, u32 delta) * Called after processing group of packets. * but all westwood needs is the last sample of srtt. */ -static void tcp_westwood_pkts_acked(struct sock *sk, u32 cnt, ktime_t last) +static void tcp_westwood_pkts_acked(struct sock *sk, u32 cnt, s32 rtt) { struct westwood *w = inet_csk_ca(sk); - if (cnt > 0) - w->rtt = tcp_sk(sk)->srtt >> 3; + + if (rtt > 0) + w->rtt = usecs_to_jiffies(rtt); } /* |