netdev - Re: [PATCH net-next v2 04/12] net-timestamp: add static key to control the whole bpf extension

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Message-ID: <670dc70fe946f_2e1742294e4@willemb.c.googlers.com.notmuch>
Date: Mon, 14 Oct 2024 21:36:15 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jason Xing <kerneljasonxing@...il.com>, 
 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, 
 martin.lau@...ux.dev, 
 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
Cc: bpf@...r.kernel.org, 
 netdev@...r.kernel.org, 
 Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v2 04/12] net-timestamp: add static key to
 control the whole bpf extension

Jason Xing wrote:
> From: Jason Xing <kernelxing@...cent.com>
> 
> Willem suggested that we use a static key to control. The advantage
> is that we will not affect the existing applications at all if we
> don't load BPF program.
> 
> In this patch, except the static key, I also add one logic that is
> used to test if the socket has enabled its tsflags in order to
> support bpf logic to allow both cases to happen at the same time.

These two features are unrelated, should probably be separate patches.

> Or else, the skb carring related timestamp flag doesn't know which
> way of printing is desirable.
> 
> One thing important is this patch allows print from both applications
> and bpf program at the same time. Now we have three kinds of print:
> 1) only BPF program prints
> 2) only application program prints
> 3) both can print without side effect
> 
> Signed-off-by: Jason Xing <kernelxing@...cent.com>