tcp_bbr: introduce bbr_bw_to_pacing_rate() helper
Introduce a helper to convert a BBR bandwidth and gain factor to a
pacing rate in bytes per second. This is a pure refactor, but is
needed for two following fixes.
Fixes: 0f8782ea14
("tcp_bbr: add BBR congestion control")
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -211,6 +211,16 @@ static u64 bbr_rate_bytes_per_sec(struct sock *sk, u64 rate, int gain)
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return rate >> BW_SCALE;
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}
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/* Convert a BBR bw and gain factor to a pacing rate in bytes per second. */
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static u32 bbr_bw_to_pacing_rate(struct sock *sk, u32 bw, int gain)
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{
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u64 rate = bw;
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rate = bbr_rate_bytes_per_sec(sk, rate, gain);
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rate = min_t(u64, rate, sk->sk_max_pacing_rate);
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return rate;
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}
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/* Pace using current bw estimate and a gain factor. In order to help drive the
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* network toward lower queues while maintaining high utilization and low
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* latency, the average pacing rate aims to be slightly (~1%) lower than the
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@ -220,10 +230,8 @@ static u64 bbr_rate_bytes_per_sec(struct sock *sk, u64 rate, int gain)
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*/
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static void bbr_set_pacing_rate(struct sock *sk, u32 bw, int gain)
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{
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u64 rate = bw;
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u32 rate = bbr_bw_to_pacing_rate(sk, bw, gain);
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rate = bbr_rate_bytes_per_sec(sk, rate, gain);
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rate = min_t(u64, rate, sk->sk_max_pacing_rate);
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if (bbr_full_bw_reached(sk) || rate > sk->sk_pacing_rate)
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sk->sk_pacing_rate = rate;
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}
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