drivers/net/ethernet/mellanox/mlx5/core/dev.c - linux - Git at Google

 /*
  * Copyright (c) 2013-2015, 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/mlx5/driver.h>
 #include "mlx5_core.h"

 static LIST_HEAD(intf_list);
 static LIST_HEAD(mlx5_dev_list);
 /* intf dev list mutex */
 static DEFINE_MUTEX(mlx5_intf_mutex);

 struct mlx5_device_context {
 	struct list_head	list;
 	struct mlx5_interface  *intf;
 	void		       *context;
 	unsigned long		state;
 };

 enum {
 	MLX5_INTERFACE_ADDED,
 	MLX5_INTERFACE_ATTACHED,
 };


 void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	if (!mlx5_lag_intf_add(intf, priv))
 		return;

 	dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
 	if (!dev_ctx)
 		return;

 	dev_ctx->intf = intf;

 	dev_ctx->context = intf->add(dev);
 	if (dev_ctx->context) {
 		set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 		if (intf->attach)
 			set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);

 		spin_lock_irq(&priv->ctx_lock);
 		list_add_tail(&dev_ctx->list, &priv->ctx_list);
 		spin_unlock_irq(&priv->ctx_lock);
 	}

 	if (!dev_ctx->context)
 		kfree(dev_ctx);
 }

 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
 						   struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;

 	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 		if (dev_ctx->intf == intf)
 			return dev_ctx;
 	return NULL;
 }

 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	dev_ctx = mlx5_get_device(intf, priv);
 	if (!dev_ctx)
 		return;

 	spin_lock_irq(&priv->ctx_lock);
 	list_del(&dev_ctx->list);
 	spin_unlock_irq(&priv->ctx_lock);

 	if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 		intf->remove(dev, dev_ctx->context);

 	kfree(dev_ctx);
 }

 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	dev_ctx = mlx5_get_device(intf, priv);
 	if (!dev_ctx)
 		return;

 	if (intf->attach) {
 		if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 			return;
 		if (intf->attach(dev, dev_ctx->context))
 			return;
 		set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 	} else {
 		if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 			return;
 		dev_ctx->context = intf->add(dev);
 		if (!dev_ctx->context)
 			return;
 		set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 	}
 }

 void mlx5_attach_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_attach_interface(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);
 }

 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	dev_ctx = mlx5_get_device(intf, priv);
 	if (!dev_ctx)
 		return;

 	if (intf->detach) {
 		if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 			return;
 		intf->detach(dev, dev_ctx->context);
 		clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 	} else {
 		if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 			return;
 		intf->remove(dev, dev_ctx->context);
 		clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 	}
 }

 void mlx5_detach_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_detach_interface(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);
 }

 bool mlx5_device_registered(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv;
 	bool found = false;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		if (priv == &dev->priv)
 			found = true;
 	mutex_unlock(&mlx5_intf_mutex);

 	return found;
 }

 int mlx5_register_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_add_tail(&priv->dev_list, &mlx5_dev_list);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_add_device(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);

 	return 0;
 }

 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry_reverse(intf, &intf_list, list)
 		mlx5_remove_device(intf, priv);
 	list_del(&priv->dev_list);
 	mutex_unlock(&mlx5_intf_mutex);
 }

 int mlx5_register_interface(struct mlx5_interface *intf)
 {
 	struct mlx5_priv *priv;

 	if (!intf->add || !intf->remove)
 		return -EINVAL;

 	mutex_lock(&mlx5_intf_mutex);
 	list_add_tail(&intf->list, &intf_list);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		mlx5_add_device(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);

 	return 0;
 }
 EXPORT_SYMBOL(mlx5_register_interface);

 void mlx5_unregister_interface(struct mlx5_interface *intf)
 {
 	struct mlx5_priv *priv;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		mlx5_remove_device(intf, priv);
 	list_del(&intf->list);
 	mutex_unlock(&mlx5_intf_mutex);
 }
 EXPORT_SYMBOL(mlx5_unregister_interface);

 /* Must be called with intf_mutex held */
 static bool mlx5_has_added_dev_by_protocol(struct mlx5_core_dev *mdev, int protocol)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_interface *intf;
 	bool found = false;

 	list_for_each_entry(intf, &intf_list, list) {
 		if (intf->protocol == protocol) {
 			dev_ctx = mlx5_get_device(intf, &mdev->priv);
 			if (dev_ctx && test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 				found = true;
 			break;
 		}
 	}

 	return found;
 }

 void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol)
 {
 	mutex_lock(&mlx5_intf_mutex);
 	if (mlx5_has_added_dev_by_protocol(mdev, protocol)) {
 		mlx5_remove_dev_by_protocol(mdev, protocol);
 		mlx5_add_dev_by_protocol(mdev, protocol);
 	}
 	mutex_unlock(&mlx5_intf_mutex);
 }

 /* Must be called with intf_mutex held */
 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 {
 	struct mlx5_interface *intf;

 	list_for_each_entry(intf, &intf_list, list)
 		if (intf->protocol == protocol) {
 			mlx5_add_device(intf, &dev->priv);
 			break;
 		}
 }

 /* Must be called with intf_mutex held */
 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 {
 	struct mlx5_interface *intf;

 	list_for_each_entry(intf, &intf_list, list)
 		if (intf->protocol == protocol) {
 			mlx5_remove_device(intf, &dev->priv);
 			break;
 		}
 }

 static u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
 {
 	return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
 		     (dev->pdev->bus->number << 8) |
 		     PCI_SLOT(dev->pdev->devfn));
 }

 /* Must be called with intf_mutex held */
 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 {
 	struct mlx5_core_dev *res = NULL;
 	struct mlx5_core_dev *tmp_dev;
 	struct mlx5_priv *priv;
 	u32 pci_id;

 	if (!mlx5_core_is_pf(dev))
 		return NULL;

 	pci_id = mlx5_gen_pci_id(dev);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
 		tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
 		if (!mlx5_core_is_pf(tmp_dev))
 			continue;

 		if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
 			res = tmp_dev;
 			break;
 		}
 	}

 	return res;
 }


 void mlx5_dev_list_lock(void)
 {
 	mutex_lock(&mlx5_intf_mutex);
 }

 void mlx5_dev_list_unlock(void)
 {
 	mutex_unlock(&mlx5_intf_mutex);
 }

 int mlx5_dev_list_trylock(void)
 {
 	return mutex_trylock(&mlx5_intf_mutex);
 }
	/*
	* Copyright (c) 2013-2015, 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/mlx5/driver.h>
	#include "mlx5_core.h"

	static LIST_HEAD(intf_list);
	static LIST_HEAD(mlx5_dev_list);
	/* intf dev list mutex */
	static DEFINE_MUTEX(mlx5_intf_mutex);

	struct mlx5_device_context {
	struct list_head list;
	struct mlx5_interface *intf;
	void *context;
	unsigned long state;
	};

	enum {
	MLX5_INTERFACE_ADDED,
	MLX5_INTERFACE_ATTACHED,
	};


	void mlx5_add_device(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	if (!mlx5_lag_intf_add(intf, priv))
	return;

	dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
	if (!dev_ctx)
	return;

	dev_ctx->intf = intf;

	dev_ctx->context = intf->add(dev);
	if (dev_ctx->context) {
	set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
	if (intf->attach)
	set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);

	spin_lock_irq(&priv->ctx_lock);
	list_add_tail(&dev_ctx->list, &priv->ctx_list);
	spin_unlock_irq(&priv->ctx_lock);
	}

	if (!dev_ctx->context)
	kfree(dev_ctx);
	}

	static struct mlx5_device_context mlx5_get_device(struct mlx5_interface intf,
	struct mlx5_priv *priv)
	{
	struct mlx5_device_context *dev_ctx;

	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
	if (dev_ctx->intf == intf)
	return dev_ctx;
	return NULL;
	}

	void mlx5_remove_device(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	dev_ctx = mlx5_get_device(intf, priv);
	if (!dev_ctx)
	return;

	spin_lock_irq(&priv->ctx_lock);
	list_del(&dev_ctx->list);
	spin_unlock_irq(&priv->ctx_lock);

	if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	intf->remove(dev, dev_ctx->context);

	kfree(dev_ctx);
	}

	static void mlx5_attach_interface(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	dev_ctx = mlx5_get_device(intf, priv);
	if (!dev_ctx)
	return;

	if (intf->attach) {
	if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
	return;
	if (intf->attach(dev, dev_ctx->context))
	return;
	set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
	} else {
	if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	return;
	dev_ctx->context = intf->add(dev);
	if (!dev_ctx->context)
	return;
	set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
	}
	}

	void mlx5_attach_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_attach_interface(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);
	}

	static void mlx5_detach_interface(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	dev_ctx = mlx5_get_device(intf, priv);
	if (!dev_ctx)
	return;

	if (intf->detach) {
	if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
	return;
	intf->detach(dev, dev_ctx->context);
	clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
	} else {
	if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	return;
	intf->remove(dev, dev_ctx->context);
	clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
	}
	}

	void mlx5_detach_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_detach_interface(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);
	}

	bool mlx5_device_registered(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv;
	bool found = false;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
	if (priv == &dev->priv)
	found = true;
	mutex_unlock(&mlx5_intf_mutex);

	return found;
	}

	int mlx5_register_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_add_tail(&priv->dev_list, &mlx5_dev_list);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_add_device(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);

	return 0;
	}

	void mlx5_unregister_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry_reverse(intf, &intf_list, list)
	mlx5_remove_device(intf, priv);
	list_del(&priv->dev_list);
	mutex_unlock(&mlx5_intf_mutex);
	}

	int mlx5_register_interface(struct mlx5_interface *intf)
	{
	struct mlx5_priv *priv;

	if (!intf->add \|\| !intf->remove)
	return -EINVAL;

	mutex_lock(&mlx5_intf_mutex);
	list_add_tail(&intf->list, &intf_list);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
	mlx5_add_device(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);

	return 0;
	}
	EXPORT_SYMBOL(mlx5_register_interface);

	void mlx5_unregister_interface(struct mlx5_interface *intf)
	{
	struct mlx5_priv *priv;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
	mlx5_remove_device(intf, priv);
	list_del(&intf->list);
	mutex_unlock(&mlx5_intf_mutex);
	}
	EXPORT_SYMBOL(mlx5_unregister_interface);

	/* Must be called with intf_mutex held */
	static bool mlx5_has_added_dev_by_protocol(struct mlx5_core_dev *mdev, int protocol)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_interface *intf;
	bool found = false;

	list_for_each_entry(intf, &intf_list, list) {
	if (intf->protocol == protocol) {
	dev_ctx = mlx5_get_device(intf, &mdev->priv);
	if (dev_ctx && test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	found = true;
	break;
	}
	}

	return found;
	}

	void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol)
	{
	mutex_lock(&mlx5_intf_mutex);
	if (mlx5_has_added_dev_by_protocol(mdev, protocol)) {
	mlx5_remove_dev_by_protocol(mdev, protocol);
	mlx5_add_dev_by_protocol(mdev, protocol);
	}
	mutex_unlock(&mlx5_intf_mutex);
	}

	/* Must be called with intf_mutex held */
	void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
	{
	struct mlx5_interface *intf;

	list_for_each_entry(intf, &intf_list, list)
	if (intf->protocol == protocol) {
	mlx5_add_device(intf, &dev->priv);
	break;
	}
	}

	/* Must be called with intf_mutex held */
	void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
	{
	struct mlx5_interface *intf;

	list_for_each_entry(intf, &intf_list, list)
	if (intf->protocol == protocol) {
	mlx5_remove_device(intf, &dev->priv);
	break;
	}
	}

	static u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
	{
	return (u32)((pci_domain_nr(dev->pdev->bus) << 16) \|
	(dev->pdev->bus->number << 8) \|
	PCI_SLOT(dev->pdev->devfn));
	}

	/* Must be called with intf_mutex held */
	struct mlx5_core_dev mlx5_get_next_phys_dev(struct mlx5_core_dev dev)
	{
	struct mlx5_core_dev *res = NULL;
	struct mlx5_core_dev *tmp_dev;
	struct mlx5_priv *priv;
	u32 pci_id;

	if (!mlx5_core_is_pf(dev))
	return NULL;

	pci_id = mlx5_gen_pci_id(dev);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
	tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
	if (!mlx5_core_is_pf(tmp_dev))
	continue;

	if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
	res = tmp_dev;
	break;
	}
	}

	return res;
	}


	void mlx5_dev_list_lock(void)
	{
	mutex_lock(&mlx5_intf_mutex);
	}

	void mlx5_dev_list_unlock(void)
	{
	mutex_unlock(&mlx5_intf_mutex);
	}

	int mlx5_dev_list_trylock(void)
	{
	return mutex_trylock(&mlx5_intf_mutex);
	}