drivers/net/ethernet/mellanox/mlx4/intf.c - linux - Git at Google

 /*
  * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - 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.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */

 #include <linux/slab.h>
 #include <linux/export.h>
 #include <linux/errno.h>
 #include <net/devlink.h>

 #include "mlx4.h"

 static DEFINE_MUTEX(intf_mutex);
 static DEFINE_IDA(mlx4_adev_ida);

 static bool is_eth_supported(struct mlx4_dev *dev)
 {
 	for (int port = 1; port <= dev->caps.num_ports; port++)
 		if (dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH)
 			return true;

 	return false;
 }

 static bool is_ib_supported(struct mlx4_dev *dev)
 {
 	for (int port = 1; port <= dev->caps.num_ports; port++)
 		if (dev->caps.port_type[port] == MLX4_PORT_TYPE_IB)
 			return true;

 	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_IBOE)
 		return true;

 	return false;
 }

 static const struct mlx4_adev_device {
 	const char *suffix;
 	bool (*is_supported)(struct mlx4_dev *dev);
 } mlx4_adev_devices[] = {
 	{ "eth", is_eth_supported },
 	{ "ib", is_ib_supported },
 };

 int mlx4_adev_init(struct mlx4_dev *dev)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);

 	priv->adev_idx = ida_alloc(&mlx4_adev_ida, GFP_KERNEL);
 	if (priv->adev_idx < 0)
 		return priv->adev_idx;

 	priv->adev = kcalloc(ARRAY_SIZE(mlx4_adev_devices),
 			     sizeof(struct mlx4_adev *), GFP_KERNEL);
 	if (!priv->adev) {
 		ida_free(&mlx4_adev_ida, priv->adev_idx);
 		return -ENOMEM;
 	}

 	return 0;
 }

 void mlx4_adev_cleanup(struct mlx4_dev *dev)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);

 	kfree(priv->adev);
 	ida_free(&mlx4_adev_ida, priv->adev_idx);
 }

 static void adev_release(struct device *dev)
 {
 	struct mlx4_adev *mlx4_adev =
 		container_of(dev, struct mlx4_adev, adev.dev);
 	struct mlx4_priv *priv = mlx4_priv(mlx4_adev->mdev);
 	int idx = mlx4_adev->idx;

 	kfree(mlx4_adev);
 	priv->adev[idx] = NULL;
 }

 static struct mlx4_adev *add_adev(struct mlx4_dev *dev, int idx)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	const char *suffix = mlx4_adev_devices[idx].suffix;
 	struct auxiliary_device *adev;
 	struct mlx4_adev *madev;
 	int ret;

 	madev = kzalloc(sizeof(*madev), GFP_KERNEL);
 	if (!madev)
 		return ERR_PTR(-ENOMEM);

 	adev = &madev->adev;
 	adev->id = priv->adev_idx;
 	adev->name = suffix;
 	adev->dev.parent = &dev->persist->pdev->dev;
 	adev->dev.release = adev_release;
 	madev->mdev = dev;
 	madev->idx = idx;

 	ret = auxiliary_device_init(adev);
 	if (ret) {
 		kfree(madev);
 		return ERR_PTR(ret);
 	}

 	ret = auxiliary_device_add(adev);
 	if (ret) {
 		auxiliary_device_uninit(adev);
 		return ERR_PTR(ret);
 	}
 	return madev;
 }

 static void del_adev(struct auxiliary_device *adev)
 {
 	auxiliary_device_delete(adev);
 	auxiliary_device_uninit(adev);
 }

 int mlx4_register_auxiliary_driver(struct mlx4_adrv *madrv)
 {
 	return auxiliary_driver_register(&madrv->adrv);
 }
 EXPORT_SYMBOL_GPL(mlx4_register_auxiliary_driver);

 void mlx4_unregister_auxiliary_driver(struct mlx4_adrv *madrv)
 {
 	auxiliary_driver_unregister(&madrv->adrv);
 }
 EXPORT_SYMBOL_GPL(mlx4_unregister_auxiliary_driver);

 int mlx4_do_bond(struct mlx4_dev *dev, bool enable)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	int i, ret;

 	if (!(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_PORT_REMAP))
 		return -EOPNOTSUPP;

 	ret = mlx4_disable_rx_port_check(dev, enable);
 	if (ret) {
 		mlx4_err(dev, "Fail to %s rx port check\n",
 			 enable ? "enable" : "disable");
 		return ret;
 	}
 	if (enable) {
 		dev->flags |= MLX4_FLAG_BONDED;
 	} else {
 		ret = mlx4_virt2phy_port_map(dev, 1, 2);
 		if (ret) {
 			mlx4_err(dev, "Fail to reset port map\n");
 			return ret;
 		}
 		dev->flags &= ~MLX4_FLAG_BONDED;
 	}

 	mutex_lock(&intf_mutex);

 	for (i = 0; i < ARRAY_SIZE(mlx4_adev_devices); i++) {
 		struct mlx4_adev *madev = priv->adev[i];
 		struct mlx4_adrv *madrv;
 		enum mlx4_protocol protocol;

 		if (!madev)
 			continue;

 		device_lock(&madev->adev.dev);
 		if (!madev->adev.dev.driver) {
 			device_unlock(&madev->adev.dev);
 			continue;
 		}

 		madrv = container_of(madev->adev.dev.driver, struct mlx4_adrv,
 				     adrv.driver);
 		if (!(madrv->flags & MLX4_INTFF_BONDING)) {
 			device_unlock(&madev->adev.dev);
 			continue;
 		}

 		if (mlx4_is_mfunc(dev)) {
 			mlx4_dbg(dev,
 				 "SRIOV, disabled HA mode for intf proto %d\n",
 				 madrv->protocol);
 			device_unlock(&madev->adev.dev);
 			continue;
 		}

 		protocol = madrv->protocol;
 		device_unlock(&madev->adev.dev);

 		del_adev(&madev->adev);
 		priv->adev[i] = add_adev(dev, i);
 		if (IS_ERR(priv->adev[i])) {
 			mlx4_warn(dev, "Device[%d] (%s) failed to load\n", i,
 				  mlx4_adev_devices[i].suffix);
 			priv->adev[i] = NULL;
 			continue;
 		}

 		mlx4_dbg(dev,
 			 "Interface for protocol %d restarted with bonded mode %s\n",
 			 protocol, enable ? "enabled" : "disabled");
 	}

 	mutex_unlock(&intf_mutex);

 	return 0;
 }

 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type,
 			 void *param)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);

 	atomic_notifier_call_chain(&priv->event_nh, type, param);
 }

 int mlx4_register_event_notifier(struct mlx4_dev *dev,
 				 struct notifier_block *nb)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);

 	return atomic_notifier_chain_register(&priv->event_nh, nb);
 }
 EXPORT_SYMBOL(mlx4_register_event_notifier);

 int mlx4_unregister_event_notifier(struct mlx4_dev *dev,
 				   struct notifier_block *nb)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);

 	return atomic_notifier_chain_unregister(&priv->event_nh, nb);
 }
 EXPORT_SYMBOL(mlx4_unregister_event_notifier);

 static int add_drivers(struct mlx4_dev *dev)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	int i, ret = 0;

 	for (i = 0; i < ARRAY_SIZE(mlx4_adev_devices); i++) {
 		bool is_supported = false;

 		if (priv->adev[i])
 			continue;

 		if (mlx4_adev_devices[i].is_supported)
 			is_supported = mlx4_adev_devices[i].is_supported(dev);

 		if (!is_supported)
 			continue;

 		priv->adev[i] = add_adev(dev, i);
 		if (IS_ERR(priv->adev[i])) {
 			mlx4_warn(dev, "Device[%d] (%s) failed to load\n", i,
 				  mlx4_adev_devices[i].suffix);
 			/* We continue to rescan drivers and leave to the caller
 			 * to make decision if to release everything or
 			 * continue. */
 			ret = PTR_ERR(priv->adev[i]);
 			priv->adev[i] = NULL;
 		}
 	}
 	return ret;
 }

 static void delete_drivers(struct mlx4_dev *dev)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	bool delete_all;
 	int i;

 	delete_all = !(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP);

 	for (i = ARRAY_SIZE(mlx4_adev_devices) - 1; i >= 0; i--) {
 		bool is_supported = false;

 		if (!priv->adev[i])
 			continue;

 		if (mlx4_adev_devices[i].is_supported && !delete_all)
 			is_supported = mlx4_adev_devices[i].is_supported(dev);

 		if (is_supported)
 			continue;

 		del_adev(&priv->adev[i]->adev);
 		priv->adev[i] = NULL;
 	}
 }

 /* This function is used after mlx4_dev is reconfigured.
  */
 static int rescan_drivers_locked(struct mlx4_dev *dev)
 {
 	lockdep_assert_held(&intf_mutex);

 	delete_drivers(dev);
 	if (!(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP))
 		return 0;

 	return add_drivers(dev);
 }

 int mlx4_register_device(struct mlx4_dev *dev)
 {
 	int ret;

 	mutex_lock(&intf_mutex);

 	dev->persist->interface_state |= MLX4_INTERFACE_STATE_UP;

 	ret = rescan_drivers_locked(dev);

 	mutex_unlock(&intf_mutex);

 	if (ret) {
 		mlx4_unregister_device(dev);
 		return ret;
 	}

 	mlx4_start_catas_poll(dev);

 	return ret;
 }

 void mlx4_unregister_device(struct mlx4_dev *dev)
 {
 	if (!(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP))
 		return;

 	mlx4_stop_catas_poll(dev);
 	if (dev->persist->interface_state & MLX4_INTERFACE_STATE_DELETION &&
 	    mlx4_is_slave(dev)) {
 		/* In mlx4_remove_one on a VF */
 		u32 slave_read =
 			swab32(readl(&mlx4_priv(dev)->mfunc.comm->slave_read));

 		if (mlx4_comm_internal_err(slave_read)) {
 			mlx4_dbg(dev, "%s: comm channel is down, entering error state.\n",
 				 __func__);
 			mlx4_enter_error_state(dev->persist);
 		}
 	}
 	mutex_lock(&intf_mutex);

 	dev->persist->interface_state &= ~MLX4_INTERFACE_STATE_UP;

 	rescan_drivers_locked(dev);

 	mutex_unlock(&intf_mutex);
 }

 struct devlink_port *mlx4_get_devlink_port(struct mlx4_dev *dev, int port)
 {
 	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];

 	return &info->devlink_port;
 }
 EXPORT_SYMBOL_GPL(mlx4_get_devlink_port);
	/*
	* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
	* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - 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.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/

	#include <linux/slab.h>
	#include <linux/export.h>
	#include <linux/errno.h>
	#include <net/devlink.h>

	#include "mlx4.h"

	static DEFINE_MUTEX(intf_mutex);
	static DEFINE_IDA(mlx4_adev_ida);

	static bool is_eth_supported(struct mlx4_dev *dev)
	{
	for (int port = 1; port <= dev->caps.num_ports; port++)
	if (dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH)
	return true;

	return false;
	}

	static bool is_ib_supported(struct mlx4_dev *dev)
	{
	for (int port = 1; port <= dev->caps.num_ports; port++)
	if (dev->caps.port_type[port] == MLX4_PORT_TYPE_IB)
	return true;

	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_IBOE)
	return true;

	return false;
	}

	static const struct mlx4_adev_device {
	const char *suffix;
	bool (is_supported)(struct mlx4_dev dev);
	} mlx4_adev_devices[] = {
	{ "eth", is_eth_supported },
	{ "ib", is_ib_supported },
	};

	int mlx4_adev_init(struct mlx4_dev *dev)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);

	priv->adev_idx = ida_alloc(&mlx4_adev_ida, GFP_KERNEL);
	if (priv->adev_idx < 0)
	return priv->adev_idx;

	priv->adev = kcalloc(ARRAY_SIZE(mlx4_adev_devices),
	sizeof(struct mlx4_adev *), GFP_KERNEL);
	if (!priv->adev) {
	ida_free(&mlx4_adev_ida, priv->adev_idx);
	return -ENOMEM;
	}

	return 0;
	}

	void mlx4_adev_cleanup(struct mlx4_dev *dev)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);

	kfree(priv->adev);
	ida_free(&mlx4_adev_ida, priv->adev_idx);
	}

	static void adev_release(struct device *dev)
	{
	struct mlx4_adev *mlx4_adev =
	container_of(dev, struct mlx4_adev, adev.dev);
	struct mlx4_priv *priv = mlx4_priv(mlx4_adev->mdev);
	int idx = mlx4_adev->idx;

	kfree(mlx4_adev);
	priv->adev[idx] = NULL;
	}

	static struct mlx4_adev add_adev(struct mlx4_dev dev, int idx)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	const char *suffix = mlx4_adev_devices[idx].suffix;
	struct auxiliary_device *adev;
	struct mlx4_adev *madev;
	int ret;

	madev = kzalloc(sizeof(*madev), GFP_KERNEL);
	if (!madev)
	return ERR_PTR(-ENOMEM);

	adev = &madev->adev;
	adev->id = priv->adev_idx;
	adev->name = suffix;
	adev->dev.parent = &dev->persist->pdev->dev;
	adev->dev.release = adev_release;
	madev->mdev = dev;
	madev->idx = idx;

	ret = auxiliary_device_init(adev);
	if (ret) {
	kfree(madev);
	return ERR_PTR(ret);
	}

	ret = auxiliary_device_add(adev);
	if (ret) {
	auxiliary_device_uninit(adev);
	return ERR_PTR(ret);
	}
	return madev;
	}

	static void del_adev(struct auxiliary_device *adev)
	{
	auxiliary_device_delete(adev);
	auxiliary_device_uninit(adev);
	}

	int mlx4_register_auxiliary_driver(struct mlx4_adrv *madrv)
	{
	return auxiliary_driver_register(&madrv->adrv);
	}
	EXPORT_SYMBOL_GPL(mlx4_register_auxiliary_driver);

	void mlx4_unregister_auxiliary_driver(struct mlx4_adrv *madrv)
	{
	auxiliary_driver_unregister(&madrv->adrv);
	}
	EXPORT_SYMBOL_GPL(mlx4_unregister_auxiliary_driver);

	int mlx4_do_bond(struct mlx4_dev *dev, bool enable)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int i, ret;

	if (!(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_PORT_REMAP))
	return -EOPNOTSUPP;

	ret = mlx4_disable_rx_port_check(dev, enable);
	if (ret) {
	mlx4_err(dev, "Fail to %s rx port check\n",
	enable ? "enable" : "disable");
	return ret;
	}
	if (enable) {
	dev->flags \|= MLX4_FLAG_BONDED;
	} else {
	ret = mlx4_virt2phy_port_map(dev, 1, 2);
	if (ret) {
	mlx4_err(dev, "Fail to reset port map\n");
	return ret;
	}
	dev->flags &= ~MLX4_FLAG_BONDED;
	}

	mutex_lock(&intf_mutex);

	for (i = 0; i < ARRAY_SIZE(mlx4_adev_devices); i++) {
	struct mlx4_adev *madev = priv->adev[i];
	struct mlx4_adrv *madrv;
	enum mlx4_protocol protocol;

	if (!madev)
	continue;

	device_lock(&madev->adev.dev);
	if (!madev->adev.dev.driver) {
	device_unlock(&madev->adev.dev);
	continue;
	}

	madrv = container_of(madev->adev.dev.driver, struct mlx4_adrv,
	adrv.driver);
	if (!(madrv->flags & MLX4_INTFF_BONDING)) {
	device_unlock(&madev->adev.dev);
	continue;
	}

	if (mlx4_is_mfunc(dev)) {
	mlx4_dbg(dev,
	"SRIOV, disabled HA mode for intf proto %d\n",
	madrv->protocol);
	device_unlock(&madev->adev.dev);
	continue;
	}

	protocol = madrv->protocol;
	device_unlock(&madev->adev.dev);

	del_adev(&madev->adev);
	priv->adev[i] = add_adev(dev, i);
	if (IS_ERR(priv->adev[i])) {
	mlx4_warn(dev, "Device[%d] (%s) failed to load\n", i,
	mlx4_adev_devices[i].suffix);
	priv->adev[i] = NULL;
	continue;
	}

	mlx4_dbg(dev,
	"Interface for protocol %d restarted with bonded mode %s\n",
	protocol, enable ? "enabled" : "disabled");
	}

	mutex_unlock(&intf_mutex);

	return 0;
	}

	void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type,
	void *param)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);

	atomic_notifier_call_chain(&priv->event_nh, type, param);
	}

	int mlx4_register_event_notifier(struct mlx4_dev *dev,
	struct notifier_block *nb)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);

	return atomic_notifier_chain_register(&priv->event_nh, nb);
	}
	EXPORT_SYMBOL(mlx4_register_event_notifier);

	int mlx4_unregister_event_notifier(struct mlx4_dev *dev,
	struct notifier_block *nb)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);

	return atomic_notifier_chain_unregister(&priv->event_nh, nb);
	}
	EXPORT_SYMBOL(mlx4_unregister_event_notifier);

	static int add_drivers(struct mlx4_dev *dev)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int i, ret = 0;

	for (i = 0; i < ARRAY_SIZE(mlx4_adev_devices); i++) {
	bool is_supported = false;

	if (priv->adev[i])
	continue;

	if (mlx4_adev_devices[i].is_supported)
	is_supported = mlx4_adev_devices[i].is_supported(dev);

	if (!is_supported)
	continue;

	priv->adev[i] = add_adev(dev, i);
	if (IS_ERR(priv->adev[i])) {
	mlx4_warn(dev, "Device[%d] (%s) failed to load\n", i,
	mlx4_adev_devices[i].suffix);
	/* We continue to rescan drivers and leave to the caller
	* to make decision if to release everything or
	* continue. */
	ret = PTR_ERR(priv->adev[i]);
	priv->adev[i] = NULL;
	}
	}
	return ret;
	}

	static void delete_drivers(struct mlx4_dev *dev)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	bool delete_all;
	int i;

	delete_all = !(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP);

	for (i = ARRAY_SIZE(mlx4_adev_devices) - 1; i >= 0; i--) {
	bool is_supported = false;

	if (!priv->adev[i])
	continue;

	if (mlx4_adev_devices[i].is_supported && !delete_all)
	is_supported = mlx4_adev_devices[i].is_supported(dev);

	if (is_supported)
	continue;

	del_adev(&priv->adev[i]->adev);
	priv->adev[i] = NULL;
	}
	}

	/* This function is used after mlx4_dev is reconfigured.
	*/
	static int rescan_drivers_locked(struct mlx4_dev *dev)
	{
	lockdep_assert_held(&intf_mutex);

	delete_drivers(dev);
	if (!(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP))
	return 0;

	return add_drivers(dev);
	}

	int mlx4_register_device(struct mlx4_dev *dev)
	{
	int ret;

	mutex_lock(&intf_mutex);

	dev->persist->interface_state \|= MLX4_INTERFACE_STATE_UP;

	ret = rescan_drivers_locked(dev);

	mutex_unlock(&intf_mutex);

	if (ret) {
	mlx4_unregister_device(dev);
	return ret;
	}

	mlx4_start_catas_poll(dev);

	return ret;
	}

	void mlx4_unregister_device(struct mlx4_dev *dev)
	{
	if (!(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP))
	return;

	mlx4_stop_catas_poll(dev);
	if (dev->persist->interface_state & MLX4_INTERFACE_STATE_DELETION &&
	mlx4_is_slave(dev)) {
	/* In mlx4_remove_one on a VF */
	u32 slave_read =
	swab32(readl(&mlx4_priv(dev)->mfunc.comm->slave_read));

	if (mlx4_comm_internal_err(slave_read)) {
	mlx4_dbg(dev, "%s: comm channel is down, entering error state.\n",
	__func__);
	mlx4_enter_error_state(dev->persist);
	}
	}
	mutex_lock(&intf_mutex);

	dev->persist->interface_state &= ~MLX4_INTERFACE_STATE_UP;

	rescan_drivers_locked(dev);

	mutex_unlock(&intf_mutex);
	}

	struct devlink_port mlx4_get_devlink_port(struct mlx4_dev dev, int port)
	{
	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];

	return &info->devlink_port;
	}
	EXPORT_SYMBOL_GPL(mlx4_get_devlink_port);