linux-kernel - Re: [PATCH RFC 0/4] Add XDP RX queue index metadata via kfuncs

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Message-ID: <0cddb596-a70b-48d4-9d8e-c6cb76abd9d2@gmail.com>
Date: Thu, 25 Sep 2025 11:54:59 +0100
From: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
To: Jakub Sitnicki <jakub@...udflare.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, donald.hunter@...il.com, andrew+netdev@...n.ch,
 ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
 john.fastabend@...il.com, matttbe@...nel.org, chuck.lever@...cle.com,
 jdamato@...tly.com, skhawaja@...gle.com, dw@...idwei.uk,
 mkarsten@...terloo.ca, yoong.siang.song@...el.com,
 david.hunter.linux@...il.com, skhan@...uxfoundation.org, horms@...nel.org,
 sdf@...ichev.me, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 bpf@...r.kernel.org, linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH RFC 0/4] Add XDP RX queue index metadata via kfuncs

On 9/25/25 10:43 AM, Jakub Sitnicki wrote:
> On Tue, Sep 23, 2025 at 10:00 PM +01, Mehdi Ben Hadj Khelifa wrote:
>>   This patch series is intended to make a base for setting
>>   queue_index in the xdp_rxq_info struct in bpf/cpumap.c to
>>   the right index. Although that part I still didn't figure
>>   out yet,I m searching for my guidance to do that as well
>>   as for the correctness of the patches in this series.
> 
> What is the use case/movtivation behind this work?

The goal of the work is to have xdp programs have the correct packet RX 
queue index after being redirected through cpumap because currently the 
queue_index gets unset or more accurately set to 0 as a default in 
xdp_rxq_info. This is my current understanding.I still have to know how 
I can propogate that HW hint from the NICs to the function where I need it.

Regards,
Mehdi