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

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Message-ID: <20251025150136.47618-3-enjuk@amazon.com>
Date: Sun, 26 Oct 2025 00:01:31 +0900
From: Kohei Enju <enjuk@...zon.com>
To: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>
CC: Tony Nguyen <anthony.l.nguyen@...el.com>, Przemek Kitszel
	<przemyslaw.kitszel@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	<kohei.enju@...il.com>, Kohei Enju <enjuk@...zon.com>
Subject: [PATCH iwl-next v1 2/3] igc: expose RSS key via ethtool get_rxfh

Implement igc_ethtool_get_rxfh_key_size() and extend
igc_ethtool_get_rxfh() to return the RSS key to userspace.

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

Signed-off-by: Kohei Enju <enjuk@...zon.com>
---
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index f89c2cbaace0..0482e590bc5a 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -1490,6 +1490,11 @@ void igc_write_rss_indir_tbl(struct igc_adapter *adapter)
 	}
 }
 
+static u32 igc_ethtool_get_rxfh_key_size(struct net_device *netdev)
+{
+	return IGC_RSS_KEY_SIZE;
+}
+
 static u32 igc_ethtool_get_rxfh_indir_size(struct net_device *netdev)
 {
 	return IGC_RETA_SIZE;
@@ -1502,10 +1507,13 @@ static int igc_ethtool_get_rxfh(struct net_device *netdev,
 	int i;
 
 	rxfh->hfunc = ETH_RSS_HASH_TOP;
-	if (!rxfh->indir)
-		return 0;
-	for (i = 0; i < IGC_RETA_SIZE; i++)
-		rxfh->indir[i] = adapter->rss_indir_tbl[i];
+
+	if (rxfh->indir)
+		for (i = 0; i < IGC_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;
 }
@@ -2182,6 +2190,7 @@ static const struct ethtool_ops igc_ethtool_ops = {
 	.set_coalesce		= igc_ethtool_set_coalesce,
 	.get_rxnfc		= igc_ethtool_get_rxnfc,
 	.set_rxnfc		= igc_ethtool_set_rxnfc,
+	.get_rxfh_key_size	= igc_ethtool_get_rxfh_key_size,
 	.get_rxfh_indir_size	= igc_ethtool_get_rxfh_indir_size,
 	.get_rxfh		= igc_ethtool_get_rxfh,
 	.set_rxfh		= igc_ethtool_set_rxfh,
-- 
2.51.0