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

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Message-ID: <20251205082106.4028-5-takkozu@amazon.com>
Date: Fri, 5 Dec 2025 17:21:04 +0900
From: Takashi Kozu <takkozu@...zon.com>
To: <anthony.l.nguyen@...el.com>
CC: <przemyslaw.kitszel@...el.com>, <andrew+netdev@...n.ch>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <intel-wired-lan@...ts.osuosl.org>,
	<netdev@...r.kernel.org>, Takashi Kozu <takkozu@...zon.com>
Subject: [PATCH iwl-next v1 0/3] igb: add RSS key get/set support

This series adds ethtool get/set support for the RSS hash key in the igb
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 00:00:00:00:00:00:00:00:00:00:00:00:000
Cannot set RX flow hash configuration:
  Hash key setting not supported


With patch:

# ethtool -x $DEV | grep key -A1
RSS hash key:
86:5d:11:56:bd:6f:20:38:3b:f8:bb:df:00:3a:b0:24:95:9f:f9:f4:25:a3:01:3e:4a:15:d6:7c:4d:af:39:7e:4a:95:f2:fd:f6:b6:26:f7

# ethtool -X $DEV hkey 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
# ethtool -x $DEV | grep key -A1
RSS hash key:
00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00

Takashi Kozu (3):
  Store the RSS key inside struct igb_adapter and introduce the
  igb: expose RSS key via ethtool get_rxfh
  igb: allow configuring RSS key via ethtool set_rxfh

 drivers/net/ethernet/intel/igb/igb.h         |  4 +
 drivers/net/ethernet/intel/igb/igb_ethtool.c | 77 +++++++++++++-------
 drivers/net/ethernet/intel/igb/igb_main.c    |  7 +-
 3 files changed, 58 insertions(+), 30 deletions(-)

-- 
2.51.1