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bpf: fix SO_MAX_PACING_RATE to support TCP internal pacing

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If sch_fq packet scheduler is not used, TCP can fallback to
internal pacing, but this requires sk_pacing_status to
be properly set.

Fixes: 8c4b4c7e9f ("bpf: Add setsockopt helper function to bpf")
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yuchung Cheng 2019-01-17 08:51:01 -08:00 committed by Daniel Borkmann
parent f4924f24da
commit e224c390a6
1 changed files with 4 additions and 0 deletions
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4
net/core/filter.c
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@ -4119,6 +4119,10 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
break;
case SO_MAX_PACING_RATE: /* 32bit version */
if (val != ~0U)
cmpxchg(&sk->sk_pacing_status,
SK_PACING_NONE,
SK_PACING_NEEDED);
sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val;
sk->sk_pacing_rate = min(sk->sk_pacing_rate,
sk->sk_max_pacing_rate);