[PATCH iwl-next v5 0/4] igc: add support for forcing link speed without autonegotiation

[KhaiWenTan <khai.wen.tan@linux.intel.com>]

From: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>

This series adds support for forcing 10/100 Mb/s link speed via ethtool
when autonegotiation is disabled on the igc driver.

Changes in v5:
- add removal justification to include copper context in commit
  description for igc: remove unused autoneg_failed field (Paul)
- check that cmd->base.duplex is either DUPLEX_HALF or DUPLEX_FULL
  in igc_ethtool_set_link_ksettings() (Simon)
- dynamically override hw->fc.current_mode to igc_fc_none during
  link configuration instead of mutating requested_mode (Simon)

Changes in v4:
- Validate that autoneg is AUTONEG_ENABLE or AUTONEG_DISABLE early
  in igc_ethtool_set_link_ksettings() to avoid passing unexpected
  values to igc_handle_autoneg_disabled(). (Simon Horman)

Changes in v3:
- Modify condition from "if (duplex == DUPLEX_HALF)" to
  "if (duplex != DUPLEX_FULL)". (Simon Horman)

Changes in v2:
- When forcing half-duplex, set hw->fc.requested_mode = igc_fc_none,
  since half-duplex cannot support flow control per IEEE 802.3.
  (Simon Horman)
- Split the original single patch into three patches for clarity:
  patches 1 and 2 are preparatory cleanups; patch 3 carries the
  functional change.

v4 at:
https://patchwork.ozlabs.org/project/intel-wired-lan/cover/20260428060009.311393-1-khai.wen.tan@linux.intel.com/

v3 at:
https://patchwork.ozlabs.org/project/intel-wired-lan/cover/20260422155701.7420-1-khai.wen.tan@linux.intel.com/

v2 at:
https://patchwork.kernel.org/project/netdevbpf/patch/20260416015520.6090-4-khai.wen.tan@linux.intel.com/

v1 at:
https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260409072747.217836-1-khai.wen.tan@linux.intel.com/

Faizal Rahim (4):
  igc: remove unused autoneg_failed field
  igc: move autoneg-enabled settings into igc_handle_autoneg_enabled()
  igc: replace goto out with direct returns in
    igc_config_fc_after_link_up()
  igc: add support for forcing link speed without autonegotiation

 drivers/net/ethernet/intel/igc/igc_base.c    |  35 +++-
 drivers/net/ethernet/intel/igc/igc_defines.h |   9 +-
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 210 +++++++++++++------
 drivers/net/ethernet/intel/igc/igc_hw.h      |  10 +-
 drivers/net/ethernet/intel/igc/igc_mac.c     |  35 ++--
 drivers/net/ethernet/intel/igc/igc_main.c    |   2 +-
 drivers/net/ethernet/intel/igc/igc_phy.c     |  65 +++++-
 drivers/net/ethernet/intel/igc/igc_phy.h     |   1 +
 8 files changed, 268 insertions(+), 99 deletions(-)

--
2.43.0