Merge branch 'net-enetc-add-more-checks-to-enetc_set_rxfh'

Wei Fang says:

====================
net: enetc: add more checks to enetc_set_rxfh()

ENETC only supports Toeplitz algorithm, and VFs do not support setting
the RSS key, but enetc_set_rxfh() does not check these constraints and
silently accepts unsupported configurations. This may mislead users or
tools into believing that the requested RSS settings have been
successfully applied. So add checks to reject unsupported hash functions
and RSS key updates on VFs, and return "-EOPNOTSUPP" to user space.
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

drivers/net/ethernet/freescale/enetc/enetc_ethtool.c

@@ -795,9 +795,17 @@ 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)
+		return -EOPNOTSUPP;
+
 	/* set hash key, if PF */
-	if (rxfh->key && enetc_si_is_pf(si))
+	if (rxfh->key) {
+		if (!enetc_si_is_pf(si))
+			return -EOPNOTSUPP;
+
 		enetc_set_rss_key(si, rxfh->key);
+	}
 
 	/* set RSS table */
 	if (rxfh->indir)