[PATCH iwl-next v1 0/3] igc: add RSS key get/set support

[Kohei Enju <enjuk@amazon.com>]

This series adds ethtool get/set support for the RSS hash key in the igc
driver.
- `ethtool -x <dev>` to display the RSS key
- `ethtool -X <dev> hkey <key>` to configure the RSS key

Without patch:
 # ethtool -x $DEV | grep key -A1
 RSS hash key:
 Operation not supported
 # ethtool -X $DEV hkey be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef
 Cannot set RX flow hash configuration:
  Hash key setting not supported

With patch:
 # ethtool -x $DEV | grep key -A1
 RSS hash key:
 dd:7c:1f:06:1a:42:dc:e5:7e:90:2c:48:aa:3f:5d:5a:d7:da:ec:44:3e:3f:df:78:89:1e:3c:68:2e:59:da:a0:23:5a:32:5c:cf:5e:7e:7b
 # ethtool -X $DEV hkey be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef
 # ethtool -x $DEV | grep key -A1
 RSS hash key:
 be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef:be:ef

Kohei Enju (3):
  igc: prepare for RSS key get/set support
  igc: expose RSS key via ethtool get_rxfh
  igc: allow configuring RSS key via ethtool set_rxfh

 drivers/net/ethernet/intel/igc/igc.h         |  4 ++
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 60 ++++++++++++++------
 drivers/net/ethernet/intel/igc/igc_main.c    |  7 +--
 3 files changed, 50 insertions(+), 21 deletions(-)

-- 
2.51.0