netdev - Re: [xdp-hints] Re: [PATCH bpf-next v8 00/17] xdp: hints via kfuncs

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Message-ID: <da633a14-0d0e-0be3-6291-92313ab1550d@redhat.com>
Date:   Tue, 24 Jan 2023 13:23:49 +0100
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Stanislav Fomichev <sdf@...gle.com>
Cc:     brouer@...hat.com, Martin KaFai Lau <martin.lau@...ux.dev>,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>
Subject: Re: [xdp-hints] Re: [PATCH bpf-next v8 00/17] xdp: hints via kfuncs


On 24/01/2023 12.49, Toke Høiland-Jørgensen wrote:
> Alexander Lobakin <alexandr.lobakin@...el.com> writes:
> 
>> From: Stanislav Fomichev <sdf@...gle.com>
>> Date: Mon, 23 Jan 2023 10:55:52 -0800
>>
>>> On Mon, Jan 23, 2023 at 10:53 AM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>>>>
>>>> On 1/19/23 2:15 PM, Stanislav Fomichev wrote:
>>>>> Please see the first patch in the series for the overall
>>>>> design and use-cases.
>>>>>
>>>>> See the following email from Toke for the per-packet metadata overhead:
>>>>> https://lore.kernel.org/bpf/20221206024554.3826186-1-sdf@google.com/T/#m49d48ea08d525ec88360c7d14c4d34fb0e45e798
>>>>>
>>>>> Recent changes:
>>>>> - Keep new functions in en/xdp.c, do 'extern mlx5_xdp_metadata_ops' (Tariq)
>>>>>
>>>>> - Remove mxbuf pointer and use xsk_buff_to_mxbuf (Tariq)
>>>>>
>>>>> - Clarify xdp_buff vs 'XDP frame' (Jesper)
>>>>>
>>>>> - Explicitly mention that AF_XDP RX descriptor lacks metadata size (Jesper)
>>>>>
>>>>> - Drop libbpf_flags/xdp_flags from selftests and use ifindex instead
>>>>>     of ifname (due to recent xsk.h refactoring)
>>>>
>>>> Applied with the minor changes in the selftests discussed in patch 11 and 17.
>>>> Thanks!
>>>
>>> Awesome, thanks! I was gonna resend around Wed, but thank you for
>>> taking care of that!
>> Great stuff, congrats! :)
> 
> Yeah! Thanks for carrying this forward, Stanislav! :)

+1000 -- great work everybody! :-)

To Alexander (Cc Jesse and Tony), do you think someone from Intel could
look at extending drivers:

  drivers/net/ethernet/intel/igb/ - chip i210
  drivers/net/ethernet/intel/igc/ - chip i225
  drivers/net/ethernet/stmicro/stmmac - for CPU integrated LAN ports

We have a customer that have been eager to get hardware RX-timestamping
for their AF_XDP use-case (PoC code[1] use software timestamping via
bpf_ktime_get_ns() today).  Getting driver support will qualify this
hardware as part of their HW solution.

--Jesper
[1] 
https://github.com/xdp-project/bpf-examples/blob/master/AF_XDP-interaction/af_xdp_kern.c#L77