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

Lorenzo Bianconi
2025-09-26T06:42:29Z

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> On 9/24/25 11:31 PM, Stanislav Fomichev wrote:
> > On 09/24, Mehdi Ben Hadj Khelifa wrote:
> > > On 9/23/25 9:45 PM, Stanislav Fomichev wrote:
> > > > 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.
> > >
> > > >
> > I don't really understand what queue_index means for the cpu map. It is
> > a kernel thread doing work, there is no queue. Maybe whoever added
> > the todo can clarify?

Hi Mehdi,

IIRC it is the queue index of the NIC that received the packet from the wire.

Regards,
Lorenzo

>
> Hi Lorenzo,
> Can you help us clarify the todo added in cpu_map_bpf_prog_run_xdp() in this
> commit:
> github.com/torvalds/linux/commit/9216477449f33cdbc9c9a99d49f500b7fbb81702 ?
>
> Regards,
> Mehdi

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