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bpf: tcp: Allow to write tp->snd_cwnd_stamp in bpf_tcp_ca 

This patch allows the write of tp->snd_cwnd_stamp in a bpf tcp
ca program. An use case of writing this field is to keep track
of the time whenever tp->snd_cwnd is raised or reduced inside
the `cong_control` callback.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Miao Xu <miaxu@meta.com>
Link: https://lore.kernel.org/r/20240502042318.801932-3-miaxu@meta.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Miao Xu 2024-05-01 21:23:17 -07:00 committed by Martin KaFai Lau
parent 57bfc7605c
commit 0325cbd21e
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/bpf_tcp_ca.c
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@ -107,6 +107,9 @@ static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
case offsetof(struct tcp_sock, snd_cwnd_cnt):
end = offsetofend(struct tcp_sock, snd_cwnd_cnt);
break;
case offsetof(struct tcp_sock, snd_cwnd_stamp):
end = offsetofend(struct tcp_sock, snd_cwnd_stamp);
break;
case offsetof(struct tcp_sock, snd_ssthresh):
end = offsetofend(struct tcp_sock, snd_ssthresh);
break;