netdev - Re: [PATCH net-next v3 02/14] net-timestamp: allow two features to work parallelly

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Message-ID: <CAL+tcoDP+ZRSHou881eLDss0QjNVsgHmQ-ezkR3oOOAwxSbj_w@mail.gmail.com>
Date: Sun, 3 Nov 2024 08:42:53 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: Simon Horman <horms@...nel.org>
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, 
	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, shuah@...nel.org, 
	ykolal@...com, bpf@...r.kernel.org, netdev@...r.kernel.org, 
	Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v3 02/14] net-timestamp: allow two features to
 work parallelly

On Sat, Nov 2, 2024 at 9:44 PM Simon Horman <horms@...nel.org> wrote:
>
> On Mon, Oct 28, 2024 at 07:05:23PM +0800, Jason Xing wrote:
> > From: Jason Xing <kernelxing@...cent.com>
> >
> > This patch has introduced a separate sk_tsflags_bpf for bpf
> > extension, which helps us let two feature work nearly at the
> > same time.
> >
> > Each feature will finally take effect on skb_shinfo(skb)->tx_flags,
> > say, tcp_tx_timestamp() for TCP or skb_setup_tx_timestamp() for
> > other types, so in __skb_tstamp_tx() we are unable to know which
> > feature is turned on, unless we check each feature's own socket
> > flag field.
> >
> > Signed-off-by: Jason Xing <kernelxing@...cent.com>
> > ---
> >  include/net/sock.h |  1 +
> >  net/core/skbuff.c  | 39 +++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 40 insertions(+)
> >
> > diff --git a/include/net/sock.h b/include/net/sock.h
> > index 7464e9f9f47c..5384f1e49f5c 100644
> > --- a/include/net/sock.h
> > +++ b/include/net/sock.h
> > @@ -445,6 +445,7 @@ struct sock {
> >       u32                     sk_reserved_mem;
> >       int                     sk_forward_alloc;
> >       u32                     sk_tsflags;
> > +     u32                     sk_tsflags_bpf;
>
> Please add sk_tsflags_bpf to the Kernel doc for this structure.
> Likewise for sk_tskey_bpf_offset which is added by a subsequent patch.

Oh, thanks for reminding me!