path: root/net/ipv4/tcp_rate.c
diff options
authorDeepti Raghavan <deeptir@mit.edu>2018-07-09 17:53:39 +0000
committerDavid S. Miller <davem@davemloft.net>2018-07-11 23:01:56 -0700
commit4929c9428a171145f82f81aae0c3c25ef7d82837 (patch)
tree06b40ce94924ece01ded4e949be9ba05f977faef /net/ipv4/tcp_rate.c
parentnet: sched: fix unprotected access to rcu cookie pointer (diff)
tcp: expose both send and receive intervals for rate sample
Congestion control algorithms, which access the rate sample through the tcp_cong_control function, only have access to the maximum of the send and receive interval, for cases where the acknowledgment rate may be inaccurate due to ACK compression or decimation. Algorithms may want to use send rates and receive rates as separate signals. Signed-off-by: Deepti Raghavan <deeptir@mit.edu> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_rate.c')
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/tcp_rate.c b/net/ipv4/tcp_rate.c
index c61240e43923..4dff40dad4dc 100644
--- a/net/ipv4/tcp_rate.c
+++ b/net/ipv4/tcp_rate.c
@@ -146,6 +146,10 @@ void tcp_rate_gen(struct sock *sk, u32 delivered, u32 lost,
rs->prior_mstamp); /* ack phase */
rs->interval_us = max(snd_us, ack_us);
+ /* Record both segment send and ack receive intervals */
+ rs->snd_interval_us = snd_us;
+ rs->rcv_interval_us = ack_us;
/* Normally we expect interval_us >= min-rtt.
* Note that rate may still be over-estimated when a spuriously
* retransmistted skb was first (s)acked because "interval_us"