[PATCH net-next v6 0/6] 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.
- Expand pktgen with txtime feature.

Details and detailed changelog in the individual patches.

High level changes:
  v5 -> v6
    - Address feedback
  v4 -> v5
    - Rebase + small kdoc fix only
  v3 -> v4
    - Replace ethtool API with rtnetlink
    - Drop/defer pktgen patch: not essential

NOTE: the idpf patch will have a minor merge conflict with commit
"idpf: add missing cpu_to_le32 in idpf_tx_splitq_build_flow_desc".
The end-result should look as in this series.
(https://lore.kernel.org/netdev/20260803210707.1912217-1-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 (6):
  net: rtnetlink: add pacing_offload_horizon attribute to net_device
  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      |   6 +
 .../networking/net_cachelines/net_device.rst  |   3 +-
 drivers/net/ethernet/intel/idpf/idpf.h        |  12 ++
 drivers/net/ethernet/intel/idpf/idpf_lib.c    |   3 +
 drivers/net/ethernet/intel/idpf/idpf_txrx.c   |  66 +++++++-
 drivers/net/ethernet/intel/idpf/idpf_txrx.h   |   2 +
 .../net/ethernet/intel/idpf/idpf_virtchnl.c   |  53 +++++-
 include/linux/netdevice.h                     |   4 +-
 include/uapi/linux/if_link.h                  |   1 +
 net/core/rtnetlink.c                          |  21 +++
 net/sched/sch_fq.c                            |  25 ++-
 .../testing/selftests/drivers/net/so_txtime.c | 158 +++++++++++++-----
 .../selftests/drivers/net/so_txtime.py        |  74 +++++++-
 13 files changed, 372 insertions(+), 56 deletions(-)

-- 
2.55.0.691.gc56d675ccc-goog