ixgbevf: extract GRXRINGS from .get_rxnfc

Commit 84eaf4359c36 ("net: ethtool: add get_rx_ring_count callback to
optimize RX ring queries") added specific support for GRXRINGS callback,
simplifying .get_rxnfc.

Remove the handling of GRXRINGS in .get_rxnfc() by moving it to the new
.get_rx_ring_count().

This simplifies the RX ring count retrieval and aligns ixgbevf with the new
ethtool API for querying RX ring parameters.

Signed-off-by: Breno Leitao <[e-mail]>
Signed-off-by: Aleksandr Loktionov <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/intel/ixgbevf/ethtool.c

···
 	return 0;
 }
 
-static int ixgbevf_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
-			     u32 *rules __always_unused)
+static u32 ixgbevf_get_rx_ring_count(struct net_device *dev)
 {
 	struct ixgbevf_adapter *adapter = netdev_priv(dev);
 
-	switch (info->cmd) {
-	case ETHTOOL_GRXRINGS:
-		info->data = adapter->num_rx_queues;
-		return 0;
-	default:
-		hw_dbg(&adapter->hw, "Command parameters not supported\n");
-		return -EOPNOTSUPP;
-	}
+	return adapter->num_rx_queues;
 }
 
 static u32 ixgbevf_get_rxfh_indir_size(struct net_device *netdev)
···
 	.get_ethtool_stats	= ixgbevf_get_ethtool_stats,
 	.get_coalesce		= ixgbevf_get_coalesce,
 	.set_coalesce		= ixgbevf_set_coalesce,
-	.get_rxnfc		= ixgbevf_get_rxnfc,
+	.get_rx_ring_count	= ixgbevf_get_rx_ring_count,
 	.get_rxfh_indir_size	= ixgbevf_get_rxfh_indir_size,
 	.get_rxfh_key_size	= ixgbevf_get_rxfh_key_size,
 	.get_rxfh		= ixgbevf_get_rxfh,