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tcp: bpf: Add TCP_BPF_RTO_MIN for bpf_setsockopt

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This patch adds bpf_setsockopt(TCP_BPF_RTO_MIN) to allow bpf prog
to set the min rto of a connection.  It could be used together
with the earlier patch which has added bpf_setsockopt(TCP_BPF_DELACK_MAX).

A later selftest patch will communicate the max delay ack in a
bpf tcp header option and then the receiving side can use
bpf_setsockopt(TCP_BPF_RTO_MIN) to set a shorter rto.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200820190027.2884170-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau
2020-08-20 12:00:27 -07:00
committed by Alexei Starovoitov
parent 2b8ee4f05d
commit ca584ba070
6 changed files with 13 additions and 1 deletions
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1
tools/include/uapi/linux/bpf.h
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@@ -4258,6 +4258,7 @@ enum {
TCP_BPF_IW = 1001, /* Set TCP initial congestion window */
TCP_BPF_SNDCWND_CLAMP = 1002, /* Set sndcwnd_clamp */
TCP_BPF_DELACK_MAX = 1003, /* Max delay ack in usecs */
TCP_BPF_RTO_MIN = 1004, /* Min delay ack in usecs */
};
struct bpf_perf_event_value {