IB/mlx5: Restrict 'DELAY_DROP_TIMEOUT' subtype to Ethernet interfaces

Subtype 'DELAY_DROP_TIMEOUT' (under 'GENERAL' event) is restricted to
Ethernet interfaces. This patch doesn't change functionality or breaks
current flow. In the downstream patch, non Ethernet (like IB) interfaces
will receive 'GENERAL' event.

Fixes: 5d3c537f90 ("net/mlx5: Handle event of power detection in the PCIE slot")
Signed-off-by: Aya Levin <ayal@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/infiniband/hw/mlx5/main.c

@@ -4347,9 +4347,13 @@ static void delay_drop_handler(struct work_struct *work)
 static void handle_general_event(struct mlx5_ib_dev *ibdev, struct mlx5_eqe *eqe,
 				 struct ib_event *ibev)
 {
+	u8 port = (eqe->data.port.port >> 4) & 0xf;
+
 	switch (eqe->sub_type) {
 	case MLX5_GENERAL_SUBTYPE_DELAY_DROP_TIMEOUT:
-		schedule_work(&ibdev->delay_drop.delay_drop_work);
+		if (mlx5_ib_port_link_layer(&ibdev->ib_dev, port) ==
+					    IB_LINK_LAYER_ETHERNET)
+			schedule_work(&ibdev->delay_drop.delay_drop_work);
 		break;
 	default: /* do nothing */
 		return;