[Intel-wired-lan] [PATCH iwl-next v1 0/8] igc: harmonize queue priority and add preemptible queue support

[Faizal Rahim <faizal.abdul.rahim@linux.intel.com>]

MAC Merge support for frame preemption was previously added for igc:
https://patchwork.kernel.org/project/netdevbpf/patch/20250318030742.2567080-1-faizal.abdul.rahim@linux.intel.com/

This series builds on that work and adds support for:
- Harmonizing taprio and mqprio queue priority behavior, based on past
  discussions and suggestions:
  https://lore.kernel.org/all/20250214102206.25dqgut5tbak2rkz@skbuf/
- Enabling preemptible queue support for both taprio and mqprio, with
  priority harmonization as a prerequisite.

It is based on the iwl tree as the baseline for development.

Patch organization:
- Patches 1–3: Preparation work for patches 6 and 7
- Patches 4–5: Introduce queue priority harmonization
- Patches 6–8: Add preemptible queue support

The series depends on the following patches, which are currently in the
iwl tree and pending integration into netdev/net-next:
- igc: Change Tx mode for MQPRIO offloading
- igc: Limit netdev_tc calls to MQPRIO

Chwee-Lin Choong (1):
  igc: SW pad preemptible frames for correct mCRC calculation

Faizal Rahim (7):
  igc: move IGC_TXDCTL_QUEUE_ENABLE and IGC_TXDCTL_SWFLUSH
  igc: add TXDCTL prefix to related macros
  igc: refactor TXDCTL macros to use FIELD_PREP and GEN_MASK
  igc: assign highest TX queue number as highest priority in mqprio
  igc: add private flag to reverse TX queue priority in TSN mode
  igc: add preemptible queue support in taprio
  igc: add preemptible queue support in mqprio

 drivers/net/ethernet/intel/igc/igc.h         |  24 +++-
 drivers/net/ethernet/intel/igc/igc_base.h    |   4 -
 drivers/net/ethernet/intel/igc/igc_defines.h |   1 +
 drivers/net/ethernet/intel/igc/igc_ethtool.c |  12 +-
 drivers/net/ethernet/intel/igc/igc_main.c    |  50 ++++++--
 drivers/net/ethernet/intel/igc/igc_tsn.c     | 116 ++++++++++++++++---
 drivers/net/ethernet/intel/igc/igc_tsn.h     |   5 +
 7 files changed, 179 insertions(+), 33 deletions(-)

--
2.34.1