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tcp_bbr: fix bbr pacing rate for internal pacing

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This commit makes BBR use only the MSS (without any headers) to
calculate pacing rates when internal TCP-layer pacing is used.

This is necessary to achieve the correct pacing behavior in this case,
since tcp_internal_pacing() uses only the payload length to calculate
pacing delays.

Signed-off-by: Kevin Yang <yyd@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2018-06-20 16:07:35 -04:00
committed by David S. Miller
parent 3f484a6e76
commit cadefe5f58
3 changed files with 16 additions and 15 deletions
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6
net/ipv4/tcp_bbr.c
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@@ -205,7 +205,11 @@ static u32 bbr_bw(const struct sock *sk)
*/
static u64 bbr_rate_bytes_per_sec(struct sock *sk, u64 rate, int gain)
{
rate *= tcp_mss_to_mtu(sk, tcp_sk(sk)->mss_cache);
unsigned int mss = tcp_sk(sk)->mss_cache;
if (!tcp_needs_internal_pacing(sk))
mss = tcp_mss_to_mtu(sk, mss);
rate *= mss;
rate *= gain;
rate >>= BBR_SCALE;
rate *= USEC_PER_SEC;