From 0325cbd21e3c26eff88bc7da303ffb46b4f5d294 Mon Sep 17 00:00:00 2001 From: Miao Xu Date: Wed, 1 May 2024 21:23:17 -0700 Subject: [PATCH] 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 Signed-off-by: Miao Xu Link: https://lore.kernel.org/r/20240502042318.801932-3-miaxu@meta.com Signed-off-by: Martin KaFai Lau --- net/ipv4/bpf_tcp_ca.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c index 6bd7f8db189a9..18227757ec0ce 100644 --- a/net/ipv4/bpf_tcp_ca.c +++ b/net/ipv4/bpf_tcp_ca.c @@ -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; -- 2.30.2