en_main.c

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/*
 * 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/slab.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
 */

/* Enable RSS UDP traffic */
MLX4_EN_PARM_INT(udp_rss, 1,
         "Enable RSS for incomming UDP traffic 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");

int en_print(const char *level, const struct mlx4_en_priv *priv,
         const char *format, ...)
{
    va_list args;
    struct va_format vaf;
    int i;

    va_start(args, format);

    vaf.fmt = format;
    vaf.va = &args;
    if (priv->registered)
        i = printk("%s%s: %s: %pV",
               level, DRV_NAME, priv->dev->name, &vaf);
    else
        i = printk("%s%s: %s: Port %d: %pV",
               level, DRV_NAME, dev_name(&priv->mdev->pdev->dev),
               priv->port, &vaf);
    va_end(args);

    return i;
}

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

    params->udp_rss = udp_rss;
    params->num_tx_rings_p_up = min_t(int, num_online_cpus(),
            MLX4_EN_MAX_TX_RING_P_UP);
    if (params->udp_rss && !(mdev->dev->caps.flags
                    & MLX4_DEV_CAP_FLAG_UDP_RSS)) {
        mlx4_warn(mdev, "UDP RSS is not supported on this device.\n");
        params->udp_rss = 0;
    }
    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 = params->num_tx_rings_p_up *
            MLX4_EN_NUM_UP;
        params->prof[i].rss_rings = 0;
    }

    return 0;
}

static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port)
{
    struct mlx4_en_dev *endev = ctx;

    return endev->pndev[port];
}

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

    switch (event) {
    case MLX4_DEV_EVENT_PORT_UP:
    case MLX4_DEV_EVENT_PORT_DOWN:
        if (!mdev->pndev[port])
            return;
        priv = netdev_priv(mdev->pndev[port]);
        /* 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:
        if (port < 1 || port > dev->caps.num_ports ||
            !mdev->pndev[port])
            return;
        mlx4_warn(mdev, "Unhandled event %d for port %d\n", event,
              (int) port);
    }
}

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);
    iounmap(mdev->uar_map);
    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)
{
    struct mlx4_en_dev *mdev;
    int i;
    int err;

    printk_once(KERN_INFO "%s", mlx4_en_version);

    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((phys_addr_t) 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_map;
    }
    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 which ports to start according to module parameters */
    mdev->port_cnt = 0;
    mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
        mdev->port_cnt++;

    mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
        if (!dev->caps.comp_pool) {
            mdev->profile.prof[i].rx_ring_num =
                rounddown_pow_of_two(max_t(int, MIN_RX_RINGS,
                               min_t(int,
                                 dev->caps.num_comp_vectors,
                                 MAX_RX_RINGS)));
        } else {
            mdev->profile.prof[i].rx_ring_num = rounddown_pow_of_two(
                min_t(int, dev->caps.comp_pool/
                      dev->caps.num_ports - 1 , MAX_MSIX_P_PORT - 1));
        }
    }

    /* 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_map:
    if (!mdev->uar_map)
        iounmap(mdev->uar_map);
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,
    .get_dev    = mlx4_en_get_netdev,
    .protocol   = MLX4_PROT_ETH,
};

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);