netdev - Re: [PATCH bpf-next 0/9] xsk: TX metadata

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Message-ID: <CAKH8qBsMnuThCMJ+rfPHBiLApQ93GirCmy5vV332d4L2g8hswA@mail.gmail.com>
Date: Mon, 14 Aug 2023 11:04:49 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc: bpf@...r.kernel.org, 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, kuba@...nel.org, toke@...nel.org, willemb@...gle.com, 
	dsahern@...nel.org, magnus.karlsson@...el.com, bjorn@...nel.org, 
	hawk@...nel.org, netdev@...r.kernel.org, xdp-hints@...-project.net, 
	Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH bpf-next 0/9] xsk: TX metadata

On Mon, Aug 14, 2023 at 4:16 AM Maciej Fijalkowski
<maciej.fijalkowski@...el.com> wrote:
>
> On Wed, Aug 09, 2023 at 09:54:09AM -0700, Stanislav Fomichev wrote:
> > This series implements initial TX metadata (offloads) for AF_XDP.
> > See patch #2 for the main implementation and mlx5-one for the
> > example on how to consume the metadata on the device side.
> >
> > Starting with two types of offloads:
> > - request TX timestamp (and write it back into the metadata area)
> > - request TX checksum offload
> >
> > Changes since last RFC:
> > - add /* private: */ comments to headers (Simon)
> > - handle metadata only in the first frag (Simon)
> > - rename xdp_hw_metadata flags (Willem)
> > - s/tmo_request_checksum/tmo_request_timestamp/ in xdp_metadata_ops
> >   comment (Willem)
> > - Documentation/networking/xsk-tx-metadata.rst
>
> Stan,
>
> thanks for working on it - we reviewed the patchset with Magnus and we
> have some questions (responded inline to patches). Overall we think it
> would be worth implementing this work against another ZC driver
> (preferably ice :P) to check that proposed API is generic enough.

Awesome, thanks for the review! I can try to see if I have some
ice-capable hw around, but if you want to help with the ice
implementation I'd gladly accept the offer :-p