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

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Message-ID: <aNMG2X2GLDLBIjzB@mini-arch>
Date: Tue, 23 Sep 2025 13:45:13 -0700
From: Stanislav Fomichev <stfomichev@...il.com>
To: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.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 09/23, Mehdi Ben Hadj Khelifa wrote:
> ---
> Mehdi Ben Hadj Khelifa (4):
>   netlink: specs: Add XDP RX queue index to XDP metadata
>   net: xdp: Add xmo_rx_queue_index callback
>   uapi: netdev: Add XDP RX queue index metadata flags
>   net: veth: Implement RX queue index XDP hint
> 
>  Documentation/netlink/specs/netdev.yaml |  5 +++++
>  drivers/net/veth.c                      | 12 ++++++++++++
>  include/net/xdp.h                       |  5 +++++
>  include/uapi/linux/netdev.h             |  3 +++
>  net/core/xdp.c                          | 15 +++++++++++++++
>  tools/include/uapi/linux/netdev.h       |  3 +++
>  6 files changed, 43 insertions(+)
>  ---
>  base-commit: 07e27ad16399afcd693be20211b0dfae63e0615f
>  this is the commit of tag: v6.17-rc7 on the mainline.
>  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.

But why do you need a kfunc getter? You can already get rxq index
via xdp_md rx_queue_index.