net/mlx5e: Add support for ethtool msglvl support

Use ethtool -s <devname> msglvl <type> on/off to toggle debug messages.
Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Inbar Karmy <inbark@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -127,6 +127,16 @@
 
 #define MLX5E_NUM_MAIN_GROUPS 9
 
+#define MLX5E_MSG_LEVEL			NETIF_MSG_LINK
+
+#define mlx5e_dbg(mlevel, priv, format, ...)                    \
+do {                                                            \
+	if (NETIF_MSG_##mlevel & (priv)->msglevel)              \
+		netdev_warn(priv->netdev, format,               \
+			    ##__VA_ARGS__);                     \
+} while (0)
+
+
 static inline u16 mlx5_min_rx_wqes(int wq_type, u32 wq_size)
 {
 	switch (wq_type) {
@@ -754,6 +764,7 @@ struct mlx5e_priv {
 #endif
 	/* priv data path fields - end */
 
+	u32                        msglevel;
 	unsigned long              state;
 	struct mutex               state_lock; /* Protects Interface state */
 	struct mlx5e_rq            drop_rq;

drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c

@@ -1340,6 +1340,16 @@ static int mlx5e_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
 	return mlx5_set_port_wol(mdev, mlx5_wol_mode);
 }
 
+static u32 mlx5e_get_msglevel(struct net_device *dev)
+{
+	return ((struct mlx5e_priv *)netdev_priv(dev))->msglevel;
+}
+
+static void mlx5e_set_msglevel(struct net_device *dev, u32 val)
+{
+	((struct mlx5e_priv *)netdev_priv(dev))->msglevel = val;
+}
+
 static int mlx5e_set_phys_id(struct net_device *dev,
 			     enum ethtool_phys_id_state state)
 {
@@ -1672,4 +1682,7 @@ const struct ethtool_ops mlx5e_ethtool_ops = {
 	.get_priv_flags    = mlx5e_get_priv_flags,
 	.set_priv_flags    = mlx5e_set_priv_flags,
 	.self_test         = mlx5e_self_test,
+	.get_msglevel      = mlx5e_get_msglevel,
+	.set_msglevel      = mlx5e_set_msglevel,
+
 };

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -4091,6 +4091,7 @@ static void mlx5e_build_nic_netdev_priv(struct mlx5_core_dev *mdev,
 	priv->netdev      = netdev;
 	priv->profile     = profile;
 	priv->ppriv       = ppriv;
+	priv->msglevel    = MLX5E_MSG_LEVEL;
 	priv->hard_mtu = MLX5E_ETH_HARD_MTU;
 
 	mlx5e_build_nic_params(mdev, &priv->channels.params, profile->max_nch(mdev));