On 09/24, Mehdi Ben Hadj Khelifa wrote:

On 9/23/25 9:45 PM, Stanislav Fomichev wrote:

quoted

On 09/23, Mehdi Ben Hadj Khelifa wrote:

quoted

---
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.

quoted

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

Hi Stanislav, When i was looking at the available information or recent
similar patches to populate the queue_index in xdp_rxq_info inside of
the cpu map of an ebpf program to run xdp. i stumbled upon this:
https://lkml.rescloud.iu.edu/2506.1/02808.html

which suggests that in order to that, a struct called "xdp_rx_meta" should
be the route to do that. In my navigation of code i only found
the closest thing to that is xdp_rx_metadata which is an enum. I tried to
follow was done for other metadata there like timestamp in order to see if
that gets me closer to do that. which was stupid with the information that i
have now but for my lack of experience (this is my first patch) i tried to
reason with the code.So yeah, since xdp_md is the structure for transfering
metadata to ebpf programs that use xdp. it's useless to have a kfunc to
expose queue_index since it's already present there. But how would one try
to populate the queue_index in xdp_rxq_info in cpu_map_bpf_prog_run_xdp()?
Any sort of hints or guides would be much appreciated.
Thank you for your time.

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?