[PATCH iwl-next 0/9] igc: Add support for Frame Preemption feature in IGC

[Faizal Rahim]

Introduces support for the FPE feature in the IGC driver.

The patches aligns with the upstream FPE API:
https://patchwork.kernel.org/project/netdevbpf/cover/20230220122343.1156614-1-vladimir.oltean@xxxxxxx/
https://patchwork.kernel.org/project/netdevbpf/cover/20230119122705.73054-1-vladimir.oltean@xxxxxxx/

It builds upon earlier work:
https://patchwork.kernel.org/project/netdevbpf/cover/20220520011538.1098888-1-vinicius.gomes@xxxxxxxxx/

The first four patches in this series are preparation work for the subsequent patches.

The patch series adds the following functionalities to the IGC driver:
a) Configure FPE using `ethtool --set-mm`.
b) Display FPE settings via `ethtool --show-mm`.
c) View FPE statistics using `ethtool --include-statistics --show-mm'.
e) Enable preemptible/express queue with `fp`:
   tc qdisc add ... root taprio \
   fp E E P P

Note:
1. preemption can occur with or without the verification handshake,
   depending on the value of the verify_enabled field, which can be
   configured using ethtool --set-mm.
2. Enabling FPE with mqprio offload is not covered in this series, but
   existing code prevents user from configuring FPE alongside mqprio offload.

Faizal Rahim (6):
  igc: Rename xdp_get_tx_ring() for non-xdp usage
  igc: Add support to set MAC Merge data via ethtool
  igc: Add support for frame preemption verification
  igc: Add support for preemptible traffic class in taprio
  igc: Add support to get MAC Merge data via ethtool
  igc: Add support to get frame preemption statistics via ethtool

Vinicius Costa Gomes (3):
  igc: Optimize the TX packet buffer utilization
  igc: Set the RX packet buffer size for TSN mode
  igc: Add support for receiving frames with all zeroes address

 drivers/net/ethernet/intel/igc/igc.h         |  45 ++-
 drivers/net/ethernet/intel/igc/igc_defines.h |  15 +-
 drivers/net/ethernet/intel/igc/igc_ethtool.c |  96 ++++++
 drivers/net/ethernet/intel/igc/igc_main.c    |  80 ++++-
 drivers/net/ethernet/intel/igc/igc_regs.h    |  19 ++
 drivers/net/ethernet/intel/igc/igc_tsn.c     | 330 ++++++++++++++++++-
 drivers/net/ethernet/intel/igc/igc_tsn.h     |  15 +
 7 files changed, 586 insertions(+), 14 deletions(-)

--
2.25.1