tcp: replace cnt & rtt with struct in pkts_acked()
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>
diff --git a/net/ipv4/tcp_htcp.c b/net/ipv4/tcp_htcp.c
index 82f0d9e..4a4d8e76 100644
--- a/net/ipv4/tcp_htcp.c
+++ b/net/ipv4/tcp_htcp.c
@@ -99,7 +99,7 @@
}
static void measure_achieved_throughput(struct sock *sk,
- u32 pkts_acked, s32 rtt)
+ const struct ack_sample *sample)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_sock *tp = tcp_sk(sk);
@@ -107,10 +107,10 @@
u32 now = tcp_time_stamp;
if (icsk->icsk_ca_state == TCP_CA_Open)
- ca->pkts_acked = pkts_acked;
+ ca->pkts_acked = sample->pkts_acked;
- if (rtt > 0)
- measure_rtt(sk, usecs_to_jiffies(rtt));
+ if (sample->rtt_us > 0)
+ measure_rtt(sk, usecs_to_jiffies(sample->rtt_us));
if (!use_bandwidth_switch)
return;
@@ -122,7 +122,7 @@
return;
}
- ca->packetcount += pkts_acked;
+ ca->packetcount += sample->pkts_acked;
if (ca->packetcount >= tp->snd_cwnd - (ca->alpha >> 7 ? : 1) &&
now - ca->lasttime >= ca->minRTT &&
