netdev - Re: [RFC bpf-next v2 05/11] bpf: Implement devtx timestamp kfunc

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Date: Thu, 22 Jun 2023 10:55:14 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: "Jesper D. Brouer" <netdev@...uer.com>
Cc: bpf@...r.kernel.org, brouer@...hat.com, ast@...nel.org, 
	daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev, 
	song@...nel.org, yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org, 
	haoluo@...gle.com, jolsa@...nel.org, netdev@...r.kernel.org
Subject: Re: [RFC bpf-next v2 05/11] bpf: Implement devtx timestamp kfunc

On Thu, Jun 22, 2023 at 5:07 AM Jesper D. Brouer <netdev@...uer.com> wrote:
>
>
>
> On 21/06/2023 19.02, Stanislav Fomichev wrote:
> > Two kfuncs, one per hook point:
> >
> > 1. at submit time - bpf_devtx_sb_request_timestamp - to request HW
> >     to put TX timestamp into TX completion descriptors
> >
> > 2. at completion time - bpf_devtx_cp_timestamp - to read out
> >     TX timestamp
> >
> [...]
> >
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index 08fbd4622ccf..2fdb0731eb67 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> [...]
> >   struct xdp_metadata_ops {
> >       int     (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
> >       int     (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash,
> >                              enum xdp_rss_hash_type *rss_type);
> > +     int     (*xmo_sb_request_timestamp)(const struct devtx_frame *ctx);
> > +     int     (*xmo_cp_timestamp)(const struct devtx_frame *ctx, u64 *timestamp);
> >   };
>
> The "sb" and "cp" abbreviations, what do they stand for?

SuBmit and ComPlete. Should I spell them out? Or any other suitable
abbreviation?