From: Stanislav Fomichev <sdf.kernel@gmail.com>
To: Kuniyuki Iwashima <kuniyu@google.com>
Cc: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Kumar Kartikeya Dwivedi" <memxor@gmail.com>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"Stanislav Fomichev" <sdf@fomichev.me>,
"Eric Dumazet" <edumazet@google.com>,
"Neal Cardwell" <ncardwell@google.com>,
"Willem de Bruijn" <willemb@google.com>,
"Tenzin Ukyab" <ukyab@berkeley.edu>,
"Clément Léger" <cleger@meta.com>,
"Kuniyuki Iwashima" <kuni1840@gmail.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next 4/7] tcp: Split out __tcp_set_rcvlowat().
Date: Mon, 21 Sep 2026 13:48:54 -0700 [thread overview]
Message-ID: <arGYL1cqUZLBjpP8@devvm7509.cco0.facebook.com> (raw)
In-Reply-To: <20260920195633.3033620-5-kuniyu@google.com>
On 09/20, Kuniyuki Iwashima wrote:
> We will add a kfunc for bpf_tcp_ops.{enqueue,dequeue}_rcvq()
> to adjust sk->sk_rcvlowat.
>
> These hooks are triggered
>
> * when the TCP stack enqueues an skb to sk->sk_receive_queue
> * after data is dequeued from sk->sk_receive_queue
>
> In the enqueue path, tcp_data_ready() is always called after
> the hooks in tcp_queue_rcv() and tcp_ofo_queue().
>
> If tcp_set_rcvlowat() were used as is, tcp_data_ready() could
> be called twice for the same skb, which is redundant and also
> confusing.
>
> Let's split out __tcp_set_rcvlowat() and add a flag to control
> wakeup behaviour.
>
> Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
next prev parent reply other threads:[~2026-09-21 20:50 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-20 19:56 [PATCH bpf-next 0/7] bpf: Add bpf_tcp_ops hooks for TCP AutoLOWAT Kuniyuki Iwashima
2026-09-20 19:56 ` [PATCH bpf-next 1/7] selftest: bpf: Use BPF_SOCK_OPS_ALL_CB_FLAGS + 1 for bad_cb_test_rv Kuniyuki Iwashima
2026-09-21 20:48 ` Stanislav Fomichev
2026-09-20 19:56 ` [PATCH bpf-next 2/7] bpf: tcp: Introduce bpf_tcp_ops.{enqueue,dequeue}_rcvq() Kuniyuki Iwashima
2026-09-20 21:16 ` bot+bpf-ci
2026-09-21 20:48 ` Stanislav Fomichev
2026-09-20 19:56 ` [PATCH bpf-next 3/7] bpf: tcp: Support bpf_sock_ops_cb_flags_set() for bpf_tcp_ops Kuniyuki Iwashima
2026-09-21 20:48 ` Stanislav Fomichev
2026-09-20 19:56 ` [PATCH bpf-next 4/7] tcp: Split out __tcp_set_rcvlowat() Kuniyuki Iwashima
2026-09-20 21:01 ` bot+bpf-ci
2026-09-20 21:12 ` Kuniyuki Iwashima
2026-09-21 20:48 ` Stanislav Fomichev [this message]
2026-09-20 19:56 ` [PATCH bpf-next 5/7] bpf: mptcp: Don't support BPF_SOCK_OPS_RCVQ_CB_FLAG Kuniyuki Iwashima
2026-09-20 19:56 ` [PATCH bpf-next 6/7] bpf: tcp: Add kfunc to adjust sk->sk_rcvlowat Kuniyuki Iwashima
2026-09-20 21:16 ` bot+bpf-ci
2026-09-21 20:49 ` Stanislav Fomichev
2026-09-21 21:36 ` Kuniyuki Iwashima
2026-09-22 7:29 ` Clément Léger
2026-09-20 19:56 ` [PATCH bpf-next 7/7] selftest: bpf: Add test for bpf_tcp_ops.{enqueue,dequeue}_rcvq() Kuniyuki Iwashima
2026-09-20 21:16 ` bot+bpf-ci
2026-09-21 20:50 ` Stanislav Fomichev
2026-09-22 23:14 ` Kuniyuki Iwashima
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