netdev - [PATCH iwl-next v1 2/3] igb: expose RSS key via ethtool get

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Message-ID: <20251205082106.4028-7-takkozu@amazon.com>
Date: Fri, 5 Dec 2025 17:21:06 +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>, Kohei Enju
	<enjuk@...zon.com>
Subject: [PATCH iwl-next v1 2/3] igb: expose RSS key via ethtool get_rxfh

Implement igc_get_rxfh_key_size() and extend
igc_get_rxfh() to return the RSS key to userspace.

This can be tested using `ethtool -x <dev>`.

Tested-by: Kohei Enju <enjuk@...zon.com>
Signed-off-by: Takashi Kozu <takkozu@...zon.com>
---
 drivers/net/ethernet/intel/igb/igb_ethtool.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index 8695ff28a7b8..2953d079ebae 100644
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -3285,11 +3285,13 @@ static int igb_get_rxfh(struct net_device *netdev,
 	int i;
 
 	rxfh->hfunc = ETH_RSS_HASH_TOP;
-	if (!rxfh->indir)
-		return 0;
-	for (i = 0; i < IGB_RETA_SIZE; i++)
-		rxfh->indir[i] = adapter->rss_indir_tbl[i];
 
+	if (rxfh->indir)
+		for (i = 0; i < IGB_RETA_SIZE; i++)
+			rxfh->indir[i] = adapter->rss_indir_tbl[i];
+
+	if (rxfh->key)
+		memcpy(rxfh->key, adapter->rss_key, sizeof(adapter->rss_key));
 	return 0;
 }
 
@@ -3328,6 +3330,11 @@ void igb_write_rss_indir_tbl(struct igb_adapter *adapter)
 	}
 }
 
+static u32 igb_get_rxfh_key_size(struct net_device *netdev)
+{
+	return IGB_RSS_KEY_SIZE;
+}
+
 static int igb_set_rxfh(struct net_device *netdev,
 			struct ethtool_rxfh_param *rxfh,
 			struct netlink_ext_ack *extack)
@@ -3491,6 +3498,7 @@ static const struct ethtool_ops igb_ethtool_ops = {
 	.get_module_eeprom	= igb_get_module_eeprom,
 	.get_rxfh_indir_size	= igb_get_rxfh_indir_size,
 	.get_rxfh		= igb_get_rxfh,
+	.get_rxfh_key_size	= igb_get_rxfh_key_size,
 	.set_rxfh		= igb_set_rxfh,
 	.get_rxfh_fields	= igb_get_rxfh_fields,
 	.set_rxfh_fields	= igb_set_rxfh_fields,
-- 
2.51.1