netdev - Re: [PATCH bpf-next v9 01/12] bpf: add support for bpf

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Message-ID: <85d1b9e5-e1c4-452d-af50-e5c3784372ce@linux.dev>
Date: Mon, 10 Feb 2025 17:02:59 -0800
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Jason Xing <kerneljasonxing@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, dsahern@...nel.org, willemdebruijn.kernel@...il.com,
 willemb@...gle.com, ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 eddyz87@...il.com, song@...nel.org, yonghong.song@...ux.dev,
 john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, horms@...nel.org, bpf@...r.kernel.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v9 01/12] bpf: add support for bpf_setsockopt()

On 2/8/25 2:32 AM, Jason Xing wrote:
> Users can write the following code to enable the bpf extension:
> int flags = SK_BPF_CB_TX_TIMESTAMPING;
> int opts = SK_BPF_CB_FLAGS;
> bpf_setsockopt(skops, SOL_SOCKET, opts, &flags, sizeof(flags));

The commit message should explain what is added/changed and why it is needed.
The above only tells how it is used, and the subject "bpf: add support for 
bpf_setsockopt()" is unclear. Add what support? Also, both get- and 
set-sockopt() are changed.

Subject: "bpf: Add networking timestamping support to bpf_get/setsockopt()"

What: The new SK_BPF_CB_FLAGS and new SK_BPF_CB_TX_TIMESTAMPING are added to 
bpf_get/setsockopt.

Why: The later patch will implement the BPF networking timestamping. The BPF 
program will use bpf_setsockopt(SK_BPF_CB_FLAGS, SK_BPF_CB_TX_TIMESTAMPING) to 
enable the BPF networking timestamping on a socket.