mlxsw: Introduce Mellanox switch driver core

Add core components of Mellanox switch driver infrastructure.
Core infrastructure is designed so that it can be used by multiple
bus drivers (PCI now, I2C and SGMII are planned to be implemented
in the future). Multiple switch kind drivers can be registered as well.
This core serves as a glue between buses and drivers.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Elad Raz <eladr@mellanox.com>
Reviewed-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 550 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
new file mode 100644
index 000000000000..a4bb94bf7a44
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -0,0 +1,550 @@
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/core.c
+ * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
+ * Copyright (c) 2015 Ido Schimmel <idosch@mellanox.com>
+ * Copyright (c) 2015 Elad Raz <eladr@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/if_link.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/u64_stats_sync.h>
+#include <linux/netdevice.h>
+
+#include "core.h"
+#include "item.h"
+#include "cmd.h"
+#include "port.h"
+#include "trap.h"
+
+static LIST_HEAD(mlxsw_core_driver_list);
+static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock);
+
+static const char mlxsw_core_driver_name[] = "mlxsw_core";
+
+static struct dentry *mlxsw_core_dbg_root;
+
+struct mlxsw_core_pcpu_stats {
+	u64			trap_rx_packets[MLXSW_TRAP_ID_MAX];
+	u64			trap_rx_bytes[MLXSW_TRAP_ID_MAX];
+	u64			port_rx_packets[MLXSW_PORT_MAX_PORTS];
+	u64			port_rx_bytes[MLXSW_PORT_MAX_PORTS];
+	struct u64_stats_sync	syncp;
+	u32			trap_rx_dropped[MLXSW_TRAP_ID_MAX];
+	u32			port_rx_dropped[MLXSW_PORT_MAX_PORTS];
+	u32			trap_rx_invalid;
+	u32			port_rx_invalid;
+};
+
+struct mlxsw_core {
+	struct mlxsw_driver *driver;
+	const struct mlxsw_bus *bus;
+	void *bus_priv;
+	const struct mlxsw_bus_info *bus_info;
+	struct list_head rx_listener_list;
+	struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
+	struct dentry *dbg_dir;
+	struct {
+		struct debugfs_blob_wrapper vsd_blob;
+		struct debugfs_blob_wrapper psid_blob;
+	} dbg;
+	unsigned long driver_priv[0];
+	/* driver_priv has to be always the last item */
+};
+
+struct mlxsw_rx_listener_item {
+	struct list_head list;
+	struct mlxsw_rx_listener rxl;
+	void *priv;
+};
+
+/*****************
+ * Core functions
+ *****************/
+
+static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data)
+{
+	struct mlxsw_core *mlxsw_core = file->private;
+	struct mlxsw_core_pcpu_stats *p;
+	u64 rx_packets, rx_bytes;
+	u64 tmp_rx_packets, tmp_rx_bytes;
+	u32 rx_dropped, rx_invalid;
+	unsigned int start;
+	int i;
+	int j;
+	static const char hdr[] =
+		"     NUM   RX_PACKETS     RX_BYTES RX_DROPPED\n";
+
+	seq_printf(file, hdr);
+	for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) {
+		rx_packets = 0;
+		rx_bytes = 0;
+		rx_dropped = 0;
+		for_each_possible_cpu(j) {
+			p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
+			do {
+				start = u64_stats_fetch_begin(&p->syncp);
+				tmp_rx_packets = p->trap_rx_packets[i];
+				tmp_rx_bytes = p->trap_rx_bytes[i];
+			} while (u64_stats_fetch_retry(&p->syncp, start));
+
+			rx_packets += tmp_rx_packets;
+			rx_bytes += tmp_rx_bytes;
+			rx_dropped += p->trap_rx_dropped[i];
+		}
+		seq_printf(file, "trap %3d %12llu %12llu %10u\n",
+			   i, rx_packets, rx_bytes, rx_dropped);
+	}
+	rx_invalid = 0;
+	for_each_possible_cpu(j) {
+		p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
+		rx_invalid += p->trap_rx_invalid;
+	}
+	seq_printf(file, "trap INV                           %10u\n",
+		   rx_invalid);
+
+	for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) {
+		rx_packets = 0;
+		rx_bytes = 0;
+		rx_dropped = 0;
+		for_each_possible_cpu(j) {
+			p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
+			do {
+				start = u64_stats_fetch_begin(&p->syncp);
+				tmp_rx_packets = p->port_rx_packets[i];
+				tmp_rx_bytes = p->port_rx_bytes[i];
+			} while (u64_stats_fetch_retry(&p->syncp, start));
+
+			rx_packets += tmp_rx_packets;
+			rx_bytes += tmp_rx_bytes;
+			rx_dropped += p->port_rx_dropped[i];
+		}
+		seq_printf(file, "port %3d %12llu %12llu %10u\n",
+			   i, rx_packets, rx_bytes, rx_dropped);
+	}
+	rx_invalid = 0;
+	for_each_possible_cpu(j) {
+		p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
+		rx_invalid += p->port_rx_invalid;
+	}
+	seq_printf(file, "port INV                           %10u\n",
+		   rx_invalid);
+	return 0;
+}
+
+static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f)
+{
+	struct mlxsw_core *mlxsw_core = inode->i_private;
+
+	return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core);
+}
+
+static const struct file_operations mlxsw_core_rx_stats_dbg_ops = {
+	.owner = THIS_MODULE,
+	.open = mlxsw_core_rx_stats_dbg_open,
+	.release = single_release,
+	.read = seq_read,
+	.llseek = seq_lseek
+};
+
+static void mlxsw_core_buf_dump_dbg(struct mlxsw_core *mlxsw_core,
+				    const char *buf, size_t size)
+{
+	__be32 *m = (__be32 *) buf;
+	int i;
+	int count = size / sizeof(__be32);
+
+	for (i = count - 1; i >= 0; i--)
+		if (m[i])
+			break;
+	i++;
+	count = i ? i : 1;
+	for (i = 0; i < count; i += 4)
+		dev_dbg(mlxsw_core->bus_info->dev, "%04x - %08x %08x %08x %08x\n",
+			i * 4, be32_to_cpu(m[i]), be32_to_cpu(m[i + 1]),
+			be32_to_cpu(m[i + 2]), be32_to_cpu(m[i + 3]));
+}
+
+int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver)
+{
+	spin_lock(&mlxsw_core_driver_list_lock);
+	list_add_tail(&mlxsw_driver->list, &mlxsw_core_driver_list);
+	spin_unlock(&mlxsw_core_driver_list_lock);
+	return 0;
+}
+EXPORT_SYMBOL(mlxsw_core_driver_register);
+
+void mlxsw_core_driver_unregister(struct mlxsw_driver *mlxsw_driver)
+{
+	spin_lock(&mlxsw_core_driver_list_lock);
+	list_del(&mlxsw_driver->list);
+	spin_unlock(&mlxsw_core_driver_list_lock);
+}
+EXPORT_SYMBOL(mlxsw_core_driver_unregister);
+
+static struct mlxsw_driver *__driver_find(const char *kind)
+{
+	struct mlxsw_driver *mlxsw_driver;
+
+	list_for_each_entry(mlxsw_driver, &mlxsw_core_driver_list, list) {
+		if (strcmp(mlxsw_driver->kind, kind) == 0)
+			return mlxsw_driver;
+	}
+	return NULL;
+}
+
+static struct mlxsw_driver *mlxsw_core_driver_get(const char *kind)
+{
+	struct mlxsw_driver *mlxsw_driver;
+
+	spin_lock(&mlxsw_core_driver_list_lock);
+	mlxsw_driver = __driver_find(kind);
+	if (!mlxsw_driver) {
+		spin_unlock(&mlxsw_core_driver_list_lock);
+		request_module(MLXSW_MODULE_ALIAS_PREFIX "%s", kind);
+		spin_lock(&mlxsw_core_driver_list_lock);
+		mlxsw_driver = __driver_find(kind);
+	}
+	if (mlxsw_driver) {
+		if (!try_module_get(mlxsw_driver->owner))
+			mlxsw_driver = NULL;
+	}
+
+	spin_unlock(&mlxsw_core_driver_list_lock);
+	return mlxsw_driver;
+}
+
+static void mlxsw_core_driver_put(const char *kind)
+{
+	struct mlxsw_driver *mlxsw_driver;
+
+	spin_lock(&mlxsw_core_driver_list_lock);
+	mlxsw_driver = __driver_find(kind);
+	spin_unlock(&mlxsw_core_driver_list_lock);
+	if (!mlxsw_driver)
+		return;
+	module_put(mlxsw_driver->owner);
+}
+
+static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core)
+{
+	const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info;
+
+	mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name,
+						 mlxsw_core_dbg_root);
+	if (!mlxsw_core->dbg_dir)
+		return -ENOMEM;
+	debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir,
+			    mlxsw_core, &mlxsw_core_rx_stats_dbg_ops);
+	mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd;
+	mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd);
+	debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir,
+			    &mlxsw_core->dbg.vsd_blob);
+	mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid;
+	mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid);
+	debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir,
+			    &mlxsw_core->dbg.psid_blob);
+	return 0;
+}
+
+static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core)
+{
+	debugfs_remove_recursive(mlxsw_core->dbg_dir);
+}
+
+int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
+				   const struct mlxsw_bus *mlxsw_bus,
+				   void *bus_priv)
+{
+	const char *device_kind = mlxsw_bus_info->device_kind;
+	struct mlxsw_core *mlxsw_core;
+	struct mlxsw_driver *mlxsw_driver;
+	size_t alloc_size;
+	int err;
+
+	mlxsw_driver = mlxsw_core_driver_get(device_kind);
+	if (!mlxsw_driver)
+		return -EINVAL;
+	alloc_size = sizeof(*mlxsw_core) + mlxsw_driver->priv_size;
+	mlxsw_core = kzalloc(alloc_size, GFP_KERNEL);
+	if (!mlxsw_core) {
+		err = -ENOMEM;
+		goto err_core_alloc;
+	}
+
+	INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
+	mlxsw_core->driver = mlxsw_driver;
+	mlxsw_core->bus = mlxsw_bus;
+	mlxsw_core->bus_priv = bus_priv;
+	mlxsw_core->bus_info = mlxsw_bus_info;
+
+	mlxsw_core->pcpu_stats =
+		netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats);
+	if (!mlxsw_core->pcpu_stats) {
+		err = -ENOMEM;
+		goto err_alloc_stats;
+	}
+	err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile);
+	if (err)
+		goto err_bus_init;
+
+	err = mlxsw_driver->init(mlxsw_core->driver_priv, mlxsw_core,
+				 mlxsw_bus_info);
+	if (err)
+		goto err_driver_init;
+
+	err = mlxsw_core_debugfs_init(mlxsw_core);
+	if (err)
+		goto err_debugfs_init;
+
+	return 0;
+
+err_debugfs_init:
+	mlxsw_core->driver->fini(mlxsw_core->driver_priv);
+err_driver_init:
+	mlxsw_bus->fini(bus_priv);
+err_bus_init:
+	free_percpu(mlxsw_core->pcpu_stats);
+err_alloc_stats:
+	kfree(mlxsw_core);
+err_core_alloc:
+	mlxsw_core_driver_put(device_kind);
+	return err;
+}
+EXPORT_SYMBOL(mlxsw_core_bus_device_register);
+
+void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
+{
+	const char *device_kind = mlxsw_core->bus_info->device_kind;
+
+	mlxsw_core_debugfs_fini(mlxsw_core);
+	mlxsw_core->driver->fini(mlxsw_core->driver_priv);
+	mlxsw_core->bus->fini(mlxsw_core->bus_priv);
+	free_percpu(mlxsw_core->pcpu_stats);
+	kfree(mlxsw_core);
+	mlxsw_core_driver_put(device_kind);
+}
+EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);
+
+static struct mlxsw_core *__mlxsw_core_get(void *driver_priv)
+{
+	return container_of(driver_priv, struct mlxsw_core, driver_priv);
+}
+
+int mlxsw_core_skb_transmit(void *driver_priv, struct sk_buff *skb,
+			    const struct mlxsw_tx_info *tx_info)
+{
+	struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv);
+
+	return mlxsw_core->bus->skb_transmit(mlxsw_core->bus_priv, skb,
+					     tx_info);
+}
+EXPORT_SYMBOL(mlxsw_core_skb_transmit);
+
+static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a,
+				   const struct mlxsw_rx_listener *rxl_b)
+{
+	return (rxl_a->func == rxl_b->func &&
+		rxl_a->local_port == rxl_b->local_port &&
+		rxl_a->trap_id == rxl_b->trap_id);
+}
+
+static struct mlxsw_rx_listener_item *
+__find_rx_listener_item(struct mlxsw_core *mlxsw_core,
+			const struct mlxsw_rx_listener *rxl,
+			void *priv)
+{
+	struct mlxsw_rx_listener_item *rxl_item;
+
+	list_for_each_entry(rxl_item, &mlxsw_core->rx_listener_list, list) {
+		if (__is_rx_listener_equal(&rxl_item->rxl, rxl) &&
+		    rxl_item->priv == priv)
+			return rxl_item;
+	}
+	return NULL;
+}
+
+int mlxsw_core_rx_listener_register(struct mlxsw_core *mlxsw_core,
+				    const struct mlxsw_rx_listener *rxl,
+				    void *priv)
+{
+	struct mlxsw_rx_listener_item *rxl_item;
+
+	rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
+	if (rxl_item)
+		return -EEXIST;
+	rxl_item = kmalloc(sizeof(*rxl_item), GFP_KERNEL);
+	if (!rxl_item)
+		return -ENOMEM;
+	rxl_item->rxl = *rxl;
+	rxl_item->priv = priv;
+
+	list_add_rcu(&rxl_item->list, &mlxsw_core->rx_listener_list);
+	return 0;
+}
+EXPORT_SYMBOL(mlxsw_core_rx_listener_register);
+
+void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core,
+				       const struct mlxsw_rx_listener *rxl,
+				       void *priv)
+{
+	struct mlxsw_rx_listener_item *rxl_item;
+
+	rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
+	if (!rxl_item)
+		return;
+	list_del_rcu(&rxl_item->list);
+	synchronize_rcu();
+	kfree(rxl_item);
+}
+EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister);
+
+void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
+			    struct mlxsw_rx_info *rx_info)
+{
+	struct mlxsw_rx_listener_item *rxl_item;
+	const struct mlxsw_rx_listener *rxl;
+	struct mlxsw_core_pcpu_stats *pcpu_stats;
+	u8 local_port = rx_info->sys_port;
+	bool found = false;
+
+	dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: sys_port = %d, trap_id = 0x%x\n",
+			    __func__, rx_info->sys_port, rx_info->trap_id);
+
+	if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) ||
+	    (local_port >= MLXSW_PORT_MAX_PORTS))
+		goto drop;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(rxl_item, &mlxsw_core->rx_listener_list, list) {
+		rxl = &rxl_item->rxl;
+		if ((rxl->local_port == MLXSW_PORT_DONT_CARE ||
+		     rxl->local_port == local_port) &&
+		    rxl->trap_id == rx_info->trap_id) {
+			found = true;
+			break;
+		}
+	}
+	rcu_read_unlock();
+	if (!found)
+		goto drop;
+
+	pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats);
+	u64_stats_update_begin(&pcpu_stats->syncp);
+	pcpu_stats->port_rx_packets[local_port]++;
+	pcpu_stats->port_rx_bytes[local_port] += skb->len;
+	pcpu_stats->trap_rx_packets[rx_info->trap_id]++;
+	pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len;
+	u64_stats_update_end(&pcpu_stats->syncp);
+
+	rxl->func(skb, local_port, rxl_item->priv);
+	return;
+
+drop:
+	if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX)
+		this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid);
+	else
+		this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]);
+	if (local_port >= MLXSW_PORT_MAX_PORTS)
+		this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid);
+	else
+		this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]);
+	dev_kfree_skb(skb);
+}
+EXPORT_SYMBOL(mlxsw_core_skb_receive);
+
+int mlxsw_cmd_exec(struct mlxsw_core *mlxsw_core, u16 opcode, u8 opcode_mod,
+		   u32 in_mod, bool out_mbox_direct,
+		   char *in_mbox, size_t in_mbox_size,
+		   char *out_mbox, size_t out_mbox_size)
+{
+	u8 status;
+	int err;
+
+	BUG_ON(in_mbox_size % sizeof(u32) || out_mbox_size % sizeof(u32));
+	if (!mlxsw_core->bus->cmd_exec)
+		return -EOPNOTSUPP;
+
+	dev_dbg(mlxsw_core->bus_info->dev, "Cmd exec (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
+		opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, in_mod);
+	if (in_mbox) {
+		dev_dbg(mlxsw_core->bus_info->dev, "Input mailbox:\n");
+		mlxsw_core_buf_dump_dbg(mlxsw_core, in_mbox, in_mbox_size);
+	}
+
+	err = mlxsw_core->bus->cmd_exec(mlxsw_core->bus_priv, opcode,
+					opcode_mod, in_mod, out_mbox_direct,
+					in_mbox, in_mbox_size,
+					out_mbox, out_mbox_size, &status);
+
+	if (err == -EIO && status != MLXSW_CMD_STATUS_OK) {
+		dev_err(mlxsw_core->bus_info->dev, "Cmd exec failed (opcode=%x(%s),opcode_mod=%x,in_mod=%x,status=%x(%s))\n",
+			opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
+			in_mod, status, mlxsw_cmd_status_str(status));
+	} else if (err == -ETIMEDOUT) {
+		dev_err(mlxsw_core->bus_info->dev, "Cmd exec timed-out (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
+			opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
+			in_mod);
+	}
+
+	if (!err && out_mbox) {
+		dev_dbg(mlxsw_core->bus_info->dev, "Output mailbox:\n");
+		mlxsw_core_buf_dump_dbg(mlxsw_core, out_mbox, out_mbox_size);
+	}
+	return err;
+}
+EXPORT_SYMBOL(mlxsw_cmd_exec);
+
+static int __init mlxsw_core_module_init(void)
+{
+	mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL);
+	if (!mlxsw_core_dbg_root)
+		return -ENOMEM;
+	return 0;
+}
+
+static void __exit mlxsw_core_module_exit(void)
+{
+	debugfs_remove_recursive(mlxsw_core_dbg_root);
+}
+
+module_init(mlxsw_core_module_init);
+module_exit(mlxsw_core_module_exit);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
+MODULE_DESCRIPTION("Mellanox switch device core driver");