[PATCH v2] net: enetc: fix the output issue of 'ethtool --show-ring'

[Wei Fang]

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: e4a1717b677c ("ethtool: provide ring sizes with RINGS_GET request")
Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
---
v2:
Set ring->*x_max_pending to priv->*x_bd_count instead of SZ_64K, this is
also explained in the commit message.
---
 drivers/net/ethernet/freescale/enetc/enetc_ethtool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index fed89d4f1e1d..2fe140ddebb2 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/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;
 
-- 
2.34.1