From: Miao Xu <miaxu@meta.com>
To: Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
David Ahern <dsahern@kernel.org>, Martin Lau <kafai@meta.com>
Cc: <netdev@vger.kernel.org>, <bpf@vger.kernel.org>,
Miao Xu <miaxu@meta.com>
Subject: [PATCH net-next v2 2/3] Allow to write tp->snd_cwnd_stamp in bpf_tcp_ca
Date: Wed, 1 May 2024 00:43:37 -0700 [thread overview]
Message-ID: <20240501074338.362361-2-miaxu@meta.com> (raw)
In-Reply-To: <20240501074338.362361-1-miaxu@meta.com>
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>
--
Changes in v2:
* None. It is a spinout from the original 1st patch.
Signed-off-by: Miao Xu <miaxu@meta.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
next prev parent reply other threads:[~2024-05-01 7:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-01 7:43 [PATCH net-next v2 1/3] Add new args for cong_control in tcp_congestion_ops Miao Xu
2024-05-01 7:43 ` Miao Xu [this message]
2024-05-01 7:43 ` [PATCH net-next v2 3/3] Add test for the use of new args in cong_control Miao Xu
2024-05-01 20:19 ` Martin KaFai Lau
2024-05-02 0:39 ` Jakub Kicinski
2024-05-01 13:26 ` [PATCH net-next v2 1/3] Add new args for cong_control in tcp_congestion_ops Jakub Kicinski
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