diff options
Diffstat (limited to 'net/ipv4/tcp_bbr.c')
| -rw-r--r-- | net/ipv4/tcp_bbr.c | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/net/ipv4/tcp_bbr.c b/net/ipv4/tcp_bbr.c index a471f696e13c..158d105e76da 100644 --- a/net/ipv4/tcp_bbr.c +++ b/net/ipv4/tcp_bbr.c @@ -97,10 +97,9 @@ struct bbr { packet_conservation:1, /* use packet conservation? */ restore_cwnd:1, /* decided to revert cwnd to old value */ round_start:1, /* start of packet-timed tx->ack round? */ - tso_segs_goal:7, /* segments we want in each skb we send */ idle_restart:1, /* restarting after idle? */ probe_rtt_round_done:1, /* a BBR_PROBE_RTT round at 4 pkts? */ - unused:5, + unused:12, lt_is_sampling:1, /* taking long-term ("LT") samples now? */ lt_rtt_cnt:7, /* round trips in long-term interval */ lt_use_bw:1; /* use lt_bw as our bw estimate? */ @@ -261,23 +260,25 @@ static void bbr_set_pacing_rate(struct sock *sk, u32 bw, int gain) sk->sk_pacing_rate = rate; } -/* Return count of segments we want in the skbs we send, or 0 for default. */ -static u32 bbr_tso_segs_goal(struct sock *sk) +/* override sysctl_tcp_min_tso_segs */ +static u32 bbr_min_tso_segs(struct sock *sk) { - struct bbr *bbr = inet_csk_ca(sk); - - return bbr->tso_segs_goal; + return sk->sk_pacing_rate < (bbr_min_tso_rate >> 3) ? 1 : 2; } -static void bbr_set_tso_segs_goal(struct sock *sk) +static u32 bbr_tso_segs_goal(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - struct bbr *bbr = inet_csk_ca(sk); - u32 min_segs; + u32 segs, bytes; + + /* Sort of tcp_tso_autosize() but ignoring + * driver provided sk_gso_max_size. + */ + bytes = min_t(u32, sk->sk_pacing_rate >> sk->sk_pacing_shift, + GSO_MAX_SIZE - 1 - MAX_TCP_HEADER); + segs = max_t(u32, bytes / tp->mss_cache, bbr_min_tso_segs(sk)); - min_segs = sk->sk_pacing_rate < (bbr_min_tso_rate >> 3) ? 1 : 2; - bbr->tso_segs_goal = min(tcp_tso_autosize(sk, tp->mss_cache, min_segs), - 0x7FU); + return min(segs, 0x7FU); } /* Save "last known good" cwnd so we can restore it after losses or PROBE_RTT */ @@ -348,7 +349,7 @@ static u32 bbr_target_cwnd(struct sock *sk, u32 bw, int gain) cwnd = (((w * gain) >> BBR_SCALE) + BW_UNIT - 1) / BW_UNIT; /* Allow enough full-sized skbs in flight to utilize end systems. */ - cwnd += 3 * bbr->tso_segs_goal; + cwnd += 3 * bbr_tso_segs_goal(sk); /* Reduce delayed ACKs by rounding up cwnd to the next even number. */ cwnd = (cwnd + 1) & ~1U; @@ -730,6 +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)) <= @@ -824,7 +827,6 @@ static void bbr_main(struct sock *sk, const struct rate_sample *rs) bw = bbr_bw(sk); bbr_set_pacing_rate(sk, bw, bbr->pacing_gain); - bbr_set_tso_segs_goal(sk); bbr_set_cwnd(sk, rs, rs->acked_sacked, bw, bbr->cwnd_gain); } @@ -834,7 +836,7 @@ static void bbr_init(struct sock *sk) struct bbr *bbr = inet_csk_ca(sk); bbr->prior_cwnd = 0; - bbr->tso_segs_goal = 0; /* default segs per skb until first ACK */ + tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; bbr->rtt_cnt = 0; bbr->next_rtt_delivered = 0; bbr->prev_ca_state = TCP_CA_Open; @@ -887,7 +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, @@ -936,7 +938,7 @@ static struct tcp_congestion_ops tcp_bbr_cong_ops __read_mostly = { .undo_cwnd = bbr_undo_cwnd, .cwnd_event = bbr_cwnd_event, .ssthresh = bbr_ssthresh, - .tso_segs_goal = bbr_tso_segs_goal, + .min_tso_segs = bbr_min_tso_segs, .get_info = bbr_get_info, .set_state = bbr_set_state, }; |