netdev - Re: [PATCH bpf-next v12 06/12] bpf: add BPF_SOCK_OPS_TS_SCHED_OPT

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Message-ID: <67b497e197e5c_10d6a329432@willemb.c.googlers.com.notmuch>
Date: Tue, 18 Feb 2025 09:23:29 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jason Xing <kerneljasonxing@...il.com>, 
 davem@...emloft.net, 
 edumazet@...gle.com, 
 kuba@...nel.org, 
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Cc: bpf@...r.kernel.org, 
 netdev@...r.kernel.org, 
 Jason Xing <kerneljasonxing@...il.com>
Subject: Re: [PATCH bpf-next v12 06/12] bpf: add BPF_SOCK_OPS_TS_SCHED_OPT_CB
 callback

Jason Xing wrote:
> Support SCM_TSTAMP_SCHED case for bpf timestamping.
> 
> Add a new sock_ops callback, BPF_SOCK_OPS_TS_SCHED_OPT_CB. This
> callback will occur at the same timestamping point as the user
> space's SCM_TSTAMP_SCHED. The BPF program can use it to get the
> same SCM_TSTAMP_SCHED timestamp without modifying the user-space
> application.
> 
> A new SKBTX_BPF flag is added to mark skb_shinfo(skb)->tx_flags,
> ensuring that the new BPF timestamping and the current user
> space's SO_TIMESTAMPING do not interfere with each other.
> 
> Signed-off-by: Jason Xing <kerneljasonxing@...il.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>