drivers/net/mlx4/en_main.c - kernel/windcharger - Git at Google

 /*
  * Copyright (c) 2007 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/cpumask.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>

 #include <linux/mlx4/driver.h>
 #include <linux/mlx4/device.h>
 #include <linux/mlx4/cmd.h>

 #include "mlx4_en.h"

 MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
 MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");

 static const char mlx4_en_version[] =
 	DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
 	DRV_VERSION " (" DRV_RELDATE ")\n";

 #define MLX4_EN_PARM_INT(X, def_val, desc) \
 	static unsigned int X = def_val;\
 	module_param(X , uint, 0444); \
 	MODULE_PARM_DESC(X, desc);


 /*
  * Device scope module parameters
  */


 /* Use a XOR rathern than Toeplitz hash function for RSS */
 MLX4_EN_PARM_INT(rss_xor, 0, "Use XOR hash function for RSS");

 /* RSS hash type mask - default to <saddr, daddr, sport, dport> */
 MLX4_EN_PARM_INT(rss_mask, 0xf, "RSS hash type bitmask");

 /* Number of LRO sessions per Rx ring (rounded up to a power of two) */
 MLX4_EN_PARM_INT(num_lro, MLX4_EN_MAX_LRO_DESCRIPTORS,
 		 "Number of LRO sessions per ring or disabled (0)");

 /* Priority pausing */
 MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
 			   " Per priority bit mask");
 MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
 			   " Per priority bit mask");

 static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
 {
 	struct mlx4_en_profile *params = &mdev->profile;
 	int i;

 	params->rss_xor = (rss_xor != 0);
 	params->rss_mask = rss_mask & 0x1f;
 	params->num_lro = min_t(int, num_lro , MLX4_EN_MAX_LRO_DESCRIPTORS);
 	for (i = 1; i <= MLX4_MAX_PORTS; i++) {
 		params->prof[i].rx_pause = 1;
 		params->prof[i].rx_ppp = pfcrx;
 		params->prof[i].tx_pause = 1;
 		params->prof[i].tx_ppp = pfctx;
 		params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
 		params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
 		params->prof[i].tx_ring_num = MLX4_EN_NUM_TX_RINGS +
 			(!!pfcrx) * MLX4_EN_NUM_PPP_RINGS;
 	}

 	return 0;
 }

 static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
 			  enum mlx4_dev_event event, int port)
 {
 	struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
 	struct mlx4_en_priv *priv;

 	if (!mdev->pndev[port])
 		return;

 	priv = netdev_priv(mdev->pndev[port]);
 	switch (event) {
 	case MLX4_DEV_EVENT_PORT_UP:
 	case MLX4_DEV_EVENT_PORT_DOWN:
 		/* To prevent races, we poll the link state in a separate
 		  task rather than changing it here */
 		priv->link_state = event;
 		queue_work(mdev->workqueue, &priv->linkstate_task);
 		break;

 	case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
 		mlx4_err(mdev, "Internal error detected, restarting device\n");
 		break;

 	default:
 		mlx4_warn(mdev, "Unhandled event: %d\n", event);
 	}
 }

 static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
 {
 	struct mlx4_en_dev *mdev = endev_ptr;
 	int i;

 	mutex_lock(&mdev->state_lock);
 	mdev->device_up = false;
 	mutex_unlock(&mdev->state_lock);

 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
 		if (mdev->pndev[i])
 			mlx4_en_destroy_netdev(mdev->pndev[i]);

 	flush_workqueue(mdev->workqueue);
 	destroy_workqueue(mdev->workqueue);
 	mlx4_mr_free(dev, &mdev->mr);
 	mlx4_uar_free(dev, &mdev->priv_uar);
 	mlx4_pd_free(dev, mdev->priv_pdn);
 	kfree(mdev);
 }

 static void *mlx4_en_add(struct mlx4_dev *dev)
 {
 	static int mlx4_en_version_printed;
 	struct mlx4_en_dev *mdev;
 	int i;
 	int err;

 	if (!mlx4_en_version_printed) {
 		printk(KERN_INFO "%s", mlx4_en_version);
 		mlx4_en_version_printed++;
 	}

 	mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
 	if (!mdev) {
 		dev_err(&dev->pdev->dev, "Device struct alloc failed, "
 			"aborting.\n");
 		err = -ENOMEM;
 		goto err_free_res;
 	}

 	if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
 		goto err_free_dev;

 	if (mlx4_uar_alloc(dev, &mdev->priv_uar))
 		goto err_pd;

 	mdev->uar_map = ioremap(mdev->priv_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
 	if (!mdev->uar_map)
 		goto err_uar;
 	spin_lock_init(&mdev->uar_lock);

 	mdev->dev = dev;
 	mdev->dma_device = &(dev->pdev->dev);
 	mdev->pdev = dev->pdev;
 	mdev->device_up = false;

 	mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
 	if (!mdev->LSO_support)
 		mlx4_warn(mdev, "LSO not supported, please upgrade to later "
 				"FW version to enable LSO\n");

 	if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
 			 MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
 			 0, 0, &mdev->mr)) {
 		mlx4_err(mdev, "Failed allocating memory region\n");
 		goto err_uar;
 	}
 	if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
 		mlx4_err(mdev, "Failed enabling memory region\n");
 		goto err_mr;
 	}

 	/* Build device profile according to supplied module parameters */
 	err = mlx4_en_get_profile(mdev);
 	if (err) {
 		mlx4_err(mdev, "Bad module parameters, aborting.\n");
 		goto err_mr;
 	}

 	/* Configure wich ports to start according to module parameters */
 	mdev->port_cnt = 0;
 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
 		mdev->port_cnt++;

 	/* If we did not receive an explicit number of Rx rings, default to
 	 * the number of completion vectors populated by the mlx4_core */
 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 		mlx4_info(mdev, "Using %d tx rings for port:%d\n",
 			  mdev->profile.prof[i].tx_ring_num, i);
 		mdev->profile.prof[i].rx_ring_num =
 			min_t(int, dev->caps.num_comp_vectors, MAX_RX_RINGS);
 		mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
 			  mdev->profile.prof[i].rx_ring_num, i);
 	}

 	/* Create our own workqueue for reset/multicast tasks
 	 * Note: we cannot use the shared workqueue because of deadlocks caused
 	 *       by the rtnl lock */
 	mdev->workqueue = create_singlethread_workqueue("mlx4_en");
 	if (!mdev->workqueue) {
 		err = -ENOMEM;
 		goto err_mr;
 	}

 	/* At this stage all non-port specific tasks are complete:
 	 * mark the card state as up */
 	mutex_init(&mdev->state_lock);
 	mdev->device_up = true;

 	/* Setup ports */

 	/* Create a netdev for each port */
 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 		mlx4_info(mdev, "Activating port:%d\n", i);
 		if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
 			mdev->pndev[i] = NULL;
 	}
 	return mdev;

 err_mr:
 	mlx4_mr_free(dev, &mdev->mr);
 err_uar:
 	mlx4_uar_free(dev, &mdev->priv_uar);
 err_pd:
 	mlx4_pd_free(dev, mdev->priv_pdn);
 err_free_dev:
 	kfree(mdev);
 err_free_res:
 	return NULL;
 }

 static struct mlx4_interface mlx4_en_interface = {
 	.add	= mlx4_en_add,
 	.remove	= mlx4_en_remove,
 	.event	= mlx4_en_event,
 };

 static int __init mlx4_en_init(void)
 {
 	return mlx4_register_interface(&mlx4_en_interface);
 }

 static void __exit mlx4_en_cleanup(void)
 {
 	mlx4_unregister_interface(&mlx4_en_interface);
 }

 module_init(mlx4_en_init);
 module_exit(mlx4_en_cleanup);
	/*
	* Copyright (c) 2007 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/cpumask.h>
	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/netdevice.h>

	#include <linux/mlx4/driver.h>
	#include <linux/mlx4/device.h>
	#include <linux/mlx4/cmd.h>

	#include "mlx4_en.h"

	MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
	MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
	MODULE_LICENSE("Dual BSD/GPL");
	MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");

	static const char mlx4_en_version[] =
	DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
	DRV_VERSION " (" DRV_RELDATE ")\n";

	#define MLX4_EN_PARM_INT(X, def_val, desc) \
	static unsigned int X = def_val;\
	module_param(X , uint, 0444); \
	MODULE_PARM_DESC(X, desc);


	/*
	* Device scope module parameters
	*/


	/* Use a XOR rathern than Toeplitz hash function for RSS */
	MLX4_EN_PARM_INT(rss_xor, 0, "Use XOR hash function for RSS");

	/* RSS hash type mask - default to <saddr, daddr, sport, dport> */
	MLX4_EN_PARM_INT(rss_mask, 0xf, "RSS hash type bitmask");

	/* Number of LRO sessions per Rx ring (rounded up to a power of two) */
	MLX4_EN_PARM_INT(num_lro, MLX4_EN_MAX_LRO_DESCRIPTORS,
	"Number of LRO sessions per ring or disabled (0)");

	/* Priority pausing */
	MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
	" Per priority bit mask");
	MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
	" Per priority bit mask");

	static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
	{
	struct mlx4_en_profile *params = &mdev->profile;
	int i;

	params->rss_xor = (rss_xor != 0);
	params->rss_mask = rss_mask & 0x1f;
	params->num_lro = min_t(int, num_lro , MLX4_EN_MAX_LRO_DESCRIPTORS);
	for (i = 1; i <= MLX4_MAX_PORTS; i++) {
	params->prof[i].rx_pause = 1;
	params->prof[i].rx_ppp = pfcrx;
	params->prof[i].tx_pause = 1;
	params->prof[i].tx_ppp = pfctx;
	params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
	params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
	params->prof[i].tx_ring_num = MLX4_EN_NUM_TX_RINGS +
	(!!pfcrx) * MLX4_EN_NUM_PPP_RINGS;
	}

	return 0;
	}

	static void mlx4_en_event(struct mlx4_dev dev, void endev_ptr,
	enum mlx4_dev_event event, int port)
	{
	struct mlx4_en_dev mdev = (struct mlx4_en_dev ) endev_ptr;
	struct mlx4_en_priv *priv;

	if (!mdev->pndev[port])
	return;

	priv = netdev_priv(mdev->pndev[port]);
	switch (event) {
	case MLX4_DEV_EVENT_PORT_UP:
	case MLX4_DEV_EVENT_PORT_DOWN:
	/* To prevent races, we poll the link state in a separate
	task rather than changing it here */
	priv->link_state = event;
	queue_work(mdev->workqueue, &priv->linkstate_task);
	break;

	case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
	mlx4_err(mdev, "Internal error detected, restarting device\n");
	break;

	default:
	mlx4_warn(mdev, "Unhandled event: %d\n", event);
	}
	}

	static void mlx4_en_remove(struct mlx4_dev dev, void endev_ptr)
	{
	struct mlx4_en_dev *mdev = endev_ptr;
	int i;

	mutex_lock(&mdev->state_lock);
	mdev->device_up = false;
	mutex_unlock(&mdev->state_lock);

	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
	if (mdev->pndev[i])
	mlx4_en_destroy_netdev(mdev->pndev[i]);

	flush_workqueue(mdev->workqueue);
	destroy_workqueue(mdev->workqueue);
	mlx4_mr_free(dev, &mdev->mr);
	mlx4_uar_free(dev, &mdev->priv_uar);
	mlx4_pd_free(dev, mdev->priv_pdn);
	kfree(mdev);
	}

	static void mlx4_en_add(struct mlx4_dev dev)
	{
	static int mlx4_en_version_printed;
	struct mlx4_en_dev *mdev;
	int i;
	int err;

	if (!mlx4_en_version_printed) {
	printk(KERN_INFO "%s", mlx4_en_version);
	mlx4_en_version_printed++;
	}

	mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
	if (!mdev) {
	dev_err(&dev->pdev->dev, "Device struct alloc failed, "
	"aborting.\n");
	err = -ENOMEM;
	goto err_free_res;
	}

	if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
	goto err_free_dev;

	if (mlx4_uar_alloc(dev, &mdev->priv_uar))
	goto err_pd;

	mdev->uar_map = ioremap(mdev->priv_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
	if (!mdev->uar_map)
	goto err_uar;
	spin_lock_init(&mdev->uar_lock);

	mdev->dev = dev;
	mdev->dma_device = &(dev->pdev->dev);
	mdev->pdev = dev->pdev;
	mdev->device_up = false;

	mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
	if (!mdev->LSO_support)
	mlx4_warn(mdev, "LSO not supported, please upgrade to later "
	"FW version to enable LSO\n");

	if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
	MLX4_PERM_LOCAL_WRITE \| MLX4_PERM_LOCAL_READ,
	0, 0, &mdev->mr)) {
	mlx4_err(mdev, "Failed allocating memory region\n");
	goto err_uar;
	}
	if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
	mlx4_err(mdev, "Failed enabling memory region\n");
	goto err_mr;
	}

	/* Build device profile according to supplied module parameters */
	err = mlx4_en_get_profile(mdev);
	if (err) {
	mlx4_err(mdev, "Bad module parameters, aborting.\n");
	goto err_mr;
	}

	/* Configure wich ports to start according to module parameters */
	mdev->port_cnt = 0;
	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
	mdev->port_cnt++;

	/* If we did not receive an explicit number of Rx rings, default to
	* the number of completion vectors populated by the mlx4_core */
	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
	mlx4_info(mdev, "Using %d tx rings for port:%d\n",
	mdev->profile.prof[i].tx_ring_num, i);
	mdev->profile.prof[i].rx_ring_num =
	min_t(int, dev->caps.num_comp_vectors, MAX_RX_RINGS);
	mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
	mdev->profile.prof[i].rx_ring_num, i);
	}

	/* Create our own workqueue for reset/multicast tasks
	* Note: we cannot use the shared workqueue because of deadlocks caused
	* by the rtnl lock */
	mdev->workqueue = create_singlethread_workqueue("mlx4_en");
	if (!mdev->workqueue) {
	err = -ENOMEM;
	goto err_mr;
	}

	/* At this stage all non-port specific tasks are complete:
	* mark the card state as up */
	mutex_init(&mdev->state_lock);
	mdev->device_up = true;

	/* Setup ports */

	/* Create a netdev for each port */
	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
	mlx4_info(mdev, "Activating port:%d\n", i);
	if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
	mdev->pndev[i] = NULL;
	}
	return mdev;

	err_mr:
	mlx4_mr_free(dev, &mdev->mr);
	err_uar:
	mlx4_uar_free(dev, &mdev->priv_uar);
	err_pd:
	mlx4_pd_free(dev, mdev->priv_pdn);
	err_free_dev:
	kfree(mdev);
	err_free_res:
	return NULL;
	}

	static struct mlx4_interface mlx4_en_interface = {
	.add = mlx4_en_add,
	.remove = mlx4_en_remove,
	.event = mlx4_en_event,
	};

	static int __init mlx4_en_init(void)
	{
	return mlx4_register_interface(&mlx4_en_interface);
	}

	static void __exit mlx4_en_cleanup(void)
	{
	mlx4_unregister_interface(&mlx4_en_interface);
	}

	module_init(mlx4_en_init);
	module_exit(mlx4_en_cleanup);