netdev - [PATCH bpf-next V2 0/6] XDP-hints kfuncs for Intel driver igc

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Date:   Tue, 21 Mar 2023 14:47:01 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     bpf@...r.kernel.org
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
        Stanislav Fomichev <sdf@...gle.com>, martin.lau@...nel.org,
        ast@...nel.org, daniel@...earbox.net, alexandr.lobakin@...el.com,
        larysa.zaremba@...el.com, xdp-hints@...-project.net,
        anthony.l.nguyen@...el.com, yoong.siang.song@...el.com,
        boon.leong.ong@...el.com, intel-wired-lan@...ts.osuosl.org,
        pabeni@...hat.com, jesse.brandeburg@...el.com, kuba@...nel.org,
        edumazet@...gle.com, john.fastabend@...il.com, hawk@...nel.org,
        davem@...emloft.net
Subject: [PATCH bpf-next V2 0/6] XDP-hints kfuncs for Intel driver igc

Implemented XDP-hints metadata kfuncs for Intel driver igc.

Primarily used the tool in tools/testing/selftests/bpf/ xdp_hw_metadata,
when doing driver development of these features. Recommend other driver
developers to do the same. In the process xdp_hw_metadata was updated to
help assist development. I've documented my practical experience with igc
and tool here[1].

[1] https://github.com/xdp-project/xdp-project/blob/master/areas/hints/xdp_hints_kfuncs02_driver_igc.org

This patchset implement RX-hash as a simple u32 value (as this is the
current kfunc API), but my experience with RX-hash is that we will also
need to provide the Hash-type for this raw value to be useful to
BPF-developers. This will be addressed in followup work once this patchset
lands.

---

Jesper Dangaard Brouer (6):
      igc: enable and fix RX hash usage by netstack
      selftests/bpf: xdp_hw_metadata track more timestamps
      selftests/bpf: xdp_hw_metadata RX hash return code info
      igc: add igc_xdp_buff wrapper for xdp_buff in driver
      igc: add XDP hints kfuncs for RX timestamp
      igc: add XDP hints kfuncs for RX hash


 drivers/net/ethernet/intel/igc/igc.h          | 35 +++++++
 drivers/net/ethernet/intel/igc/igc_main.c     | 94 ++++++++++++++++---
 .../selftests/bpf/progs/xdp_hw_metadata.c     | 18 ++--
 tools/testing/selftests/bpf/xdp_hw_metadata.c | 51 ++++++++--
 tools/testing/selftests/bpf/xdp_metadata.h    |  1 +
 5 files changed, 176 insertions(+), 23 deletions(-)

--