net: enetc: fix the output issue of 'ethtool --show-ring'

Currently, enetc_get_ringparam() only provides rx_pending and tx_pending,
but 'ethtool --show-ring' no longer displays these fields. Because the
ringparam retrieval path has moved to the new netlink interface, where
rings_fill_reply() emits the *x_pending only if the *x_max_pending values
are non-zero. So rx_max_pending and tx_max_pending to are added to
enetc_get_ringparam() to fix the issue.

Note that the maximum tx/rx ring size of hardware is 64K, but we haven't
added set_ringparam() to make the ring size configurable. To avoid users
mistakenly believing that the ring size can be increased, so set
the *x_max_pending to priv->*x_bd_count.

Fixes: e4a1717 ("ethtool: provide ring sizes with RINGS_GET request")
Signed-off-by: Wei Fang <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: WeiFang-NXP

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

@@ -813,6 +813,8 @@ static void enetc_get_ringparam(struct net_device *ndev,
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
 
+	ring->rx_max_pending = priv->rx_bd_count;
+	ring->tx_max_pending = priv->tx_bd_count;
 	ring->rx_pending = priv->rx_bd_count;
 	ring->tx_pending = priv->tx_bd_count;