netdev - [PATCH net-next v3 2/3] bpf: tcp: Allow to write tp->snd_cwnd_stamp in bpf_tcp

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Message-ID: <20240502042318.801932-3-miaxu@meta.com>
Date: Wed, 1 May 2024 21:23:17 -0700
From: Miao Xu <miaxu@...a.com>
To: Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller"
	<davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>, Martin Lau
	<kafai@...a.com>
CC: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>, Miao Xu <miaxu@...a.com>
Subject: [PATCH net-next v3 2/3] 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@...gle.com>
---
Changes in v3:
* Updated the title.

Changes in v2:
* None. It is a spinout from the original 1st patch.

Signed-off-by: Miao Xu <miaxu@...a.com>
---
 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 6bd7f8db189a..18227757ec0c 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;
-- 
2.43.0