linux-kernel - [PATCH v3 net-next 07/13] net: enetc: check if the RSS hfunc is toeplitz

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Message-Id: <20250304072201.1332603-8-wei.fang@nxp.com>
Date: Tue,  4 Mar 2025 15:21:55 +0800
From: Wei Fang <wei.fang@....com>
To: claudiu.manoil@....com,
	vladimir.oltean@....com,
	xiaoning.wang@....com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: christophe.leroy@...roup.eu,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 net-next 07/13] net: enetc: check if the RSS hfunc is toeplitz

Both ENETC v1 and ENETC v4 only support the toeplitz algorithm for RSS,
so add a check for RSS hfunc.

Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc_ethtool.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index bc65135925b8..6a47e2bd1d4f 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
@@ -753,6 +753,13 @@ static int enetc_set_rxfh(struct net_device *ndev,
 	struct enetc_si *si = priv->si;
 	int err = 0;
 
+	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
+	    rxfh->hfunc != ETH_RSS_HASH_TOP) {
+		netdev_err(ndev, "Only toeplitz hash function is supported\n");
+
+		return -EOPNOTSUPP;
+	}
+
 	/* set hash key, if PF */
 	if (rxfh->key && enetc_si_is_pf(si))
 		enetc_set_rss_key(si, rxfh->key);
-- 
2.34.1