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

[Willem de Bruijn <willemdebruijn.kernel@gmail.com>]

Jason Xing wrote:
> From: Jason Xing <kernelxing@tencent.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@tencent.com>