netdev - Re: [PATCH bpf-next v7 00/17] xdp: hints via kfuncs

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Date:   Thu, 12 Jan 2023 10:19:02 +0200
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>,
        Stanislav Fomichev <sdf@...gle.com>
Cc:     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>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>, bpf@...r.kernel.org,
        xdp-hints@...-project.net, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v7 00/17] xdp: hints via kfuncs



On 12/01/2023 9:29, Martin KaFai Lau wrote:
> On 1/11/23 4:32 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:
>>
>> - Bring back parts that were removed during patch reshuffling from "bpf:
>>    Introduce device-bound XDP programs" patch (Martin)
>>
>> - Remove netdev NULL check from __bpf_prog_dev_bound_init (Martin)
>>
>> - Remove netdev NULL check from bpf_dev_bound_resolve_kfunc (Martin)
>>
>> - Move target bound device verification from bpf_tracing_prog_attach into
>>    bpf_check_attach_target (Martin)
>>
>> - Move mlx5e_free_rx_in_progress_descs into txrx.h (Tariq)
>>
>> - mlx5e_fill_xdp_buff -> mlx5e_fill_mxbuf (Tariq)
> 
> Thanks for the patches. The set lgtm.
> 
> The selftest patch 11 and 17 have conflicts with the recent changes in 
> selftests/bpf/xsk.{h,c} and selftests/bpf/Makefile. eg. it no longer 
> needs XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD, so please respin. From a 
> quick look, it should be some minor changes.
> 
> Not sure if Tariq has a chance to look at the mlx5 changes shortly. The 
> set is getting pretty long and the core part is ready with veth and mlx4 
> support. I think it is better to get the ready parts landed first such 
> that other drivers can also start adding support for it. One option is 
> to post the two mlx5 patches as another patchset and they can be 
> reviewed separately.
> 

Hi,
I posted new comments.
I think they can be handled quickly, and still be part of the next respin.

I'm fine with both options though. You can keep the mlx5e patches or 
defer them to a followup series. Whatever works best for you.

Tariq