From: Martin KaFai Lau <martin.lau@linux.dev>
To: Jason Xing <kerneljasonxing@gmail.com>
Cc: Stanislav Fomichev <stfomichev@gmail.com>,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, dsahern@kernel.org, ast@kernel.org,
daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com,
song@kernel.org, yonghong.song@linux.dev,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me,
haoluo@google.com, jolsa@kernel.org, horms@kernel.org,
ncardwell@google.com, kuniyu@amazon.com, bpf@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH net-next 2/3] bpf: add TCP_BPF_RTO_MAX for bpf_setsockopt
Date: Thu, 13 Feb 2025 21:41:33 -0800 [thread overview]
Message-ID: <86453e67-d5dc-4565-bdd6-6383273ed819@linux.dev> (raw)
In-Reply-To: <CAL+tcoBAv5QuGeiGYUakhxBwVEsut7Gaa-96YOH03h57jtTVaQ@mail.gmail.com>
On 2/13/25 7:09 PM, Jason Xing wrote:
> On Fri, Feb 14, 2025 at 10:14 AM Martin KaFai Lau <martin.lau@linux.dev> wrote:
>>
>> On 2/13/25 3:57 PM, Jason Xing wrote:
>>> On Fri, Feb 14, 2025 at 7:41 AM Stanislav Fomichev<stfomichev@gmail.com> wrote:
>>>> On 02/13, Jason Xing wrote:
>>>>> Support bpf_setsockopt() to set the maximum value of RTO for
>>>>> BPF program.
>>>>>
>>>>> Signed-off-by: Jason Xing<kerneljasonxing@gmail.com>
>>>>> ---
>>>>> Documentation/networking/ip-sysctl.rst | 3 ++-
>>>>> include/uapi/linux/bpf.h | 2 ++
>>>>> net/core/filter.c | 6 ++++++
>>>>> tools/include/uapi/linux/bpf.h | 2 ++
>>>>> 4 files changed, 12 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
>>>>> index 054561f8dcae..78eb0959438a 100644
>>>>> --- a/Documentation/networking/ip-sysctl.rst
>>>>> +++ b/Documentation/networking/ip-sysctl.rst
>>>>> @@ -1241,7 +1241,8 @@ tcp_rto_min_us - INTEGER
>>>>>
>>>>> tcp_rto_max_ms - INTEGER
>>>>> Maximal TCP retransmission timeout (in ms).
>>>>> - Note that TCP_RTO_MAX_MS socket option has higher precedence.
>>>>> + Note that TCP_BPF_RTO_MAX and TCP_RTO_MAX_MS socket option have the
>>>>> + higher precedence for configuring this setting.
>>>> The cover letter needs more explanation about the motivation.
>>
>> +1
>>
>> I haven't looked at the patches. The cover letter has no word on the use case.
The question was your _use case_ in bpf. Not what the TCP_RTO_MAX_MS does. Your
current use case is to have bpf setting it after reading the tcp header option,
like the selftest in patch 3?
>
> I will add and copy some words from Eric's patch series :)
>>> I am targeting the net-next tree because of recent changes[1] made by
>>> Eric. It probably hasn't merged into the bpf-next tree.
>>
>> There is the bpf-next/net tree. It should have the needed changes.
>
> [1] was recently merged in the net-next tree, so the only one branch I
> can target is net-next.
>
> [1]: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=ae9b3c0e79bc
>
> Am I missing something?
There is a net branch:
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git
next prev parent reply other threads:[~2025-02-14 5:41 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-13 0:43 [PATCH net-next 0/3] bpf: support setting max RTO for bpf_setsockopt Jason Xing
2025-02-13 0:43 ` [PATCH net-next 1/3] tcp: add TCP_RTO_MAX_MIN_SEC definition Jason Xing
2025-02-13 2:19 ` Kuniyuki Iwashima
2025-02-13 0:43 ` [PATCH net-next 2/3] bpf: add TCP_BPF_RTO_MAX for bpf_setsockopt Jason Xing
2025-02-13 2:25 ` Kuniyuki Iwashima
2025-02-13 2:32 ` Kuniyuki Iwashima
2025-02-13 3:14 ` Jason Xing
2025-02-13 23:41 ` Stanislav Fomichev
2025-02-13 23:57 ` Jason Xing
2025-02-14 2:14 ` Martin KaFai Lau
2025-02-14 3:09 ` Jason Xing
2025-02-14 5:41 ` Martin KaFai Lau [this message]
2025-02-14 6:12 ` Jason Xing
2025-02-14 6:40 ` Martin KaFai Lau
2025-02-14 6:56 ` Jason Xing
2025-02-14 23:44 ` Martin KaFai Lau
2025-02-14 23:53 ` Jason Xing
2025-02-15 2:39 ` Martin KaFai Lau
2025-02-15 2:52 ` Jason Xing
2025-02-14 15:48 ` Stanislav Fomichev
2025-02-14 23:21 ` Jason Xing
2025-02-13 0:43 ` [PATCH net-next 3/3] selftests/bpf: add rto max for bpf_setsockopt test Jason Xing
2025-02-13 2:30 ` Kuniyuki Iwashima
2025-02-13 3:13 ` Jason Xing
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