[PATCH net-next v9 0/7] hardware pacing offload

From: Willem de Bruijn <willemb@google.com>

Enable safe hardware pacing offload on a first device (idpf), plus support.

- Add rtnetlink support for admin control over the device feature
- Add device support to the idpf driver

Besides the main feature, also

- Small optimization to FQ offload: avoid unnecessary ktime_.._get().
- Expand so_txtime drv-net test with hw offload testcases.

Details and detailed changelog in the individual patches.

High level changes:
  v8 -> v9
    - graceful fallback to sw pacing if hw pacing becomes unavailable
        - add new FQ patch for this fq_offload_horizon() check
    - simplify dev->pacing_offload_horizon to bool dev->pacing_offload
  v7 -> v8
    - 2 small fixes: unused variable in idpf and new ruff warning in test
  v6 -> v7
    - Rebase onto conflicting patches and address feedback
  v5 -> v6
    - Address substantial opus 5 feedback
  v4 -> v5
    - Rebase + small kdoc fix only
  v3 -> v4
    - Replace ethtool API with rtnetlink
    - Drop/defer pktgen patch: not essential

v8: https://lore.kernel.org/netdev/20260902181747.2483351-1-willemdebruijn.kernel@gmail.com/ (local)
v7: https://lore.kernel.org/netdev/20260831213221.1370774-1-willemdebruijn.kernel@gmail.com/ (local)
v6: https://lore.kernel.org/netdev/20260813020529.3506539-1-willemdebruijn.kernel@gmail.com/ (local)
v5: https://lore.kernel.org/netdev/20260808155217.885299-1-willemdebruijn.kernel@gmail.com/ (local)
v4: https://lore.kernel.org/netdev/20260806232913.4020403-1-willemdebruijn.kernel@gmail.com/ (local)
v3: https://lore.kernel.org/netdev/20260726202902.760552-1-willemdebruijn.kernel@gmail.com/ (local)
v2: https://lore.kernel.org/netdev/20260722204454.3234605-1-willemdebruijn.kernel@gmail.com/ (local)
v1: https://lore.kernel.org/netdev/20260706133433.3142805-1-willemdebruijn.kernel@gmail.com/ (local)
Willem de Bruijn (7):
  net: rtnetlink: add pacing_offload attribute to net_device
  net_sched: sch_fq: check device pacing offload
  net_sched: sch_fq: clear past skb->tstamp if offloading pacing
  idpf: support pacing offload
  selftests: drv-net: refactor so_txtime errqueue handling
  selftests: drv-net: in so_txtime tell apart sw from hw pacing
  selftests: drv-net: extend so_txtime with hw offload

 Documentation/netlink/specs/rt-link.yaml      |   5 +
 .../networking/net_cachelines/net_device.rst  |   1 +
 drivers/net/ethernet/intel/idpf/idpf.h        |  12 ++
 drivers/net/ethernet/intel/idpf/idpf_lib.c    |  19 +++
 drivers/net/ethernet/intel/idpf/idpf_txrx.c   |  69 +++++++-
 drivers/net/ethernet/intel/idpf/idpf_txrx.h   |   8 +-
 .../net/ethernet/intel/idpf/idpf_virtchnl.c   |  60 ++++++-
 include/linux/netdevice.h                     |   2 +
 include/uapi/linux/if_link.h                  |   1 +
 net/core/rtnetlink.c                          |  22 +++
 net/sched/sch_fq.c                            |  71 ++++++--
 .../testing/selftests/drivers/net/so_txtime.c | 159 +++++++++++++-----
 .../selftests/drivers/net/so_txtime.py        |  80 ++++++++-
 13 files changed, 443 insertions(+), 66 deletions(-)

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2.55.0.1007.g17ff1f9808-goog