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| author |   Yousuk Seung <ysseung@google.com> | 2018-03-16 10:51:49 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-03-16 15:07:48 -0400 |
| commit | 53794570049d314742f156c99022914840a3d5ab (patch) | |
| tree | 9156f86891850f0c12fa1cfcdf718c08fe424914 /net | |
| parent | tcp: add snd_ssthresh stat in SCM_TIMESTAMPING_OPT_STATS (diff) | |
| download | linux-dev-53794570049d314742f156c99022914840a3d5ab.tar.xz linux-dev-53794570049d314742f156c99022914840a3d5ab.zip | |
net-tcp_bbr: set tp->snd_ssthresh to BDP upon STARTUP exit
Set tp->snd_ssthresh to BDP upon STARTUP exit. This allows us
to check if a BBR flow exited STARTUP and the BDP at the
time of STARTUP exit with SCM_TIMESTAMPING_OPT_STATS. Since BBR does not
use snd_ssthresh this fix has no impact on BBR's behavior.
Signed-off-by: Yousuk Seung <ysseung@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_bbr.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/tcp_bbr.c b/net/ipv4/tcp_bbr.c index c92014cb1e16..158d105e76da 100644 --- a/net/ipv4/tcp_bbr.c +++ b/net/ipv4/tcp_bbr.c @@ -731,6 +731,8 @@ static void bbr_check_drain(struct sock *sk, const struct rate_sample *rs) bbr->mode = BBR_DRAIN; /* drain queue we created */ bbr->pacing_gain = bbr_drain_gain; /* pace slow to drain */ bbr->cwnd_gain = bbr_high_gain; /* maintain cwnd */ + tcp_sk(sk)->snd_ssthresh = + bbr_target_cwnd(sk, bbr_max_bw(sk), BBR_UNIT); } /* fall through to check if in-flight is already small: */ if (bbr->mode == BBR_DRAIN && tcp_packets_in_flight(tcp_sk(sk)) <= @@ -834,6 +836,7 @@ static void bbr_init(struct sock *sk) struct bbr *bbr = inet_csk_ca(sk); bbr->prior_cwnd = 0; + tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; bbr->rtt_cnt = 0; bbr->next_rtt_delivered = 0; bbr->prev_ca_state = TCP_CA_Open; @@ -886,7 +889,7 @@ static u32 bbr_undo_cwnd(struct sock *sk) static u32 bbr_ssthresh(struct sock *sk) { bbr_save_cwnd(sk); - return TCP_INFINITE_SSTHRESH; /* BBR does not use ssthresh */ + return tcp_sk(sk)->snd_ssthresh; } static size_t bbr_get_info(struct sock *sk, u32 ext, int *attr, |