netdev - Re: [PATCH bpf-next v12 09/12] bpf: add BPF_SOCK_OPS_TS_ACK_OPT

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Message-ID: <67b498022aba2_10d6a32944b@willemb.c.googlers.com.notmuch>
Date: Tue, 18 Feb 2025 09:24:02 -0500
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, 
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 martin.lau@...ux.dev, 
 eddyz87@...il.com, 
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Cc: bpf@...r.kernel.org, 
 netdev@...r.kernel.org, 
 Jason Xing <kerneljasonxing@...il.com>
Subject: Re: [PATCH bpf-next v12 09/12] bpf: add BPF_SOCK_OPS_TS_ACK_OPT_CB
 callback

Jason Xing wrote:
> Support the ACK case for bpf timestamping.
> 
> Add a new sock_ops callback, BPF_SOCK_OPS_TS_ACK_OPT_CB. This
> callback will occur at the same timestamping point as the user
> space's SCM_TSTAMP_ACK. The BPF program can use it to get the
> same SCM_TSTAMP_ACK timestamp without modifying the user-space
> application.
> 
> This patch extends txstamp_ack to two bits: 1 stands for
> SO_TIMESTAMPING mode, 2 bpf extension.
> 
> Signed-off-by: Jason Xing <kerneljasonxing@...il.com>

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