[PATCH iwl-next v4 0/3] igc: add support for forcing link speed without autonegotiation

KhaiWenTan
2026-04-28T06:23:09Z

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 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.

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 (3):
igc: remove unused autoneg_failed field
igc: move autoneg-enabled settings into igc_handle_autoneg_enabled()
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 | 209 +++++++++++++------
drivers/net/ethernet/intel/igc/igc_hw.h | 10 +-
drivers/net/ethernet/intel/igc/igc_mac.c | 16 +-
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, 257 insertions(+), 90 deletions(-)

--
2.43.0