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tcp: replace cnt & rtt with struct in pkts_acked()

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Replace 2 arguments (cnt and rtt) in the congestion control modules'
pkts_acked() function with a struct. This will allow adding more
information without having to modify existing congestion control
modules (tcp_nv in particular needs bytes in flight when packet
was sent).

As proposed by Neal Cardwell in his comments to the tcp_nv patch.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lawrence Brakmo
2016-05-11 10:02:13 -07:00
committed by David S. Miller
parent cf88585b1d
commit 756ee1729b
13 changed files with 60 additions and 47 deletions
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6
net/ipv4/tcp_cubic.c
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@@ -437,21 +437,21 @@ static void hystart_update(struct sock *sk, u32 delay)
/* Track delayed acknowledgment ratio using sliding window
* ratio = (15*ratio + sample) / 16
*/
static void bictcp_acked(struct sock *sk, u32 cnt, s32 rtt_us)
static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct bictcp *ca = inet_csk_ca(sk);
u32 delay;
/* Some calls are for duplicates without timetamps */
if (rtt_us < 0)
if (sample->rtt_us < 0)
return;
/* Discard delay samples right after fast recovery */
if (ca->epoch_start && (s32)(tcp_time_stamp - ca->epoch_start) < HZ)
return;
delay = (rtt_us << 3) / USEC_PER_MSEC;
delay = (sample->rtt_us << 3) / USEC_PER_MSEC;
if (delay == 0)
delay = 1;