diff options
| -rw-r--r-- | net/ipv4/tcp_bbr.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/ipv4/tcp_bbr.c b/net/ipv4/tcp_bbr.c index 42e0017f2ebc..69ee877574d0 100644 --- a/net/ipv4/tcp_bbr.c +++ b/net/ipv4/tcp_bbr.c @@ -112,7 +112,8 @@ struct bbr { cwnd_gain:10, /* current gain for setting cwnd */ full_bw_cnt:3, /* number of rounds without large bw gains */ cycle_idx:3, /* current index in pacing_gain cycle array */ - unused_b:6; + has_seen_rtt:1, /* have we seen an RTT sample yet? */ + unused_b:5; u32 prior_cwnd; /* prior cwnd upon entering loss recovery */ u32 full_bw; /* recent bw, to estimate if pipe is full */ }; @@ -225,11 +226,13 @@ static u32 bbr_bw_to_pacing_rate(struct sock *sk, u32 bw, int gain) static void bbr_init_pacing_rate_from_rtt(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); + struct bbr *bbr = inet_csk_ca(sk); u64 bw; u32 rtt_us; if (tp->srtt_us) { /* any RTT sample yet? */ rtt_us = max(tp->srtt_us >> 3, 1U); + bbr->has_seen_rtt = 1; } else { /* no RTT sample yet */ rtt_us = USEC_PER_MSEC; /* use nominal default RTT */ } @@ -247,8 +250,12 @@ static void bbr_init_pacing_rate_from_rtt(struct sock *sk) */ static void bbr_set_pacing_rate(struct sock *sk, u32 bw, int gain) { + struct tcp_sock *tp = tcp_sk(sk); + struct bbr *bbr = inet_csk_ca(sk); u32 rate = bbr_bw_to_pacing_rate(sk, bw, gain); + if (unlikely(!bbr->has_seen_rtt && tp->srtt_us)) + bbr_init_pacing_rate_from_rtt(sk); if (bbr_full_bw_reached(sk) || rate > sk->sk_pacing_rate) sk->sk_pacing_rate = rate; } @@ -837,6 +844,7 @@ static void bbr_init(struct sock *sk) minmax_reset(&bbr->bw, bbr->rtt_cnt, 0); /* init max bw to 0 */ + bbr->has_seen_rtt = 0; bbr_init_pacing_rate_from_rtt(sk); bbr->restore_cwnd = 0; |