drivers/net/mlx4/en_main.c

   1 /*
   2  * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34 #include <linux/cpumask.h>
  35 #include <linux/module.h>
  36 #include <linux/delay.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/slab.h>
  39
  40 #include <linux/mlx4/driver.h>
  41 #include <linux/mlx4/device.h>
  42 #include <linux/mlx4/cmd.h>
  43
  44 #include "mlx4_en.h"
  45
  46 MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
  47 MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
  48 MODULE_LICENSE("Dual BSD/GPL");
  49 MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");
  50
  51 static const char mlx4_en_version[] =
  52         DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
  53         DRV_VERSION " (" DRV_RELDATE ")\n";
  54
  55 #define MLX4_EN_PARM_INT(X, def_val, desc) \
  56         static unsigned int X = def_val;\
  57         module_param(X , uint, 0444); \
  58         MODULE_PARM_DESC(X, desc);
  59
  60
  61 /*
  62  * Device scope module parameters
  63  */
  64
  65
  66 /* Use a XOR rathern than Toeplitz hash function for RSS */
  67 MLX4_EN_PARM_INT(rss_xor, 0, "Use XOR hash function for RSS");
  68
  69 /* RSS hash type mask - default to <saddr, daddr, sport, dport> */
  70 MLX4_EN_PARM_INT(rss_mask, 0xf, "RSS hash type bitmask");
  71
  72 /* Number of LRO sessions per Rx ring (rounded up to a power of two) */
  73 MLX4_EN_PARM_INT(num_lro, MLX4_EN_MAX_LRO_DESCRIPTORS,
  74                  "Number of LRO sessions per ring or disabled (0)");
  75
  76 /* Priority pausing */
  77 MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
  78                            " Per priority bit mask");
  79 MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
  80                            " Per priority bit mask");
  81
  82 static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
  83 {
  84         struct mlx4_en_profile *params = &mdev->profile;
  85         int i;
  86
  87         params->rss_xor = (rss_xor != 0);
  88         params->rss_mask = rss_mask & 0x1f;
  89         params->num_lro = min_t(int, num_lro , MLX4_EN_MAX_LRO_DESCRIPTORS);
  90         for (i = 1; i <= MLX4_MAX_PORTS; i++) {
  91                 params->prof[i].rx_pause = 1;
  92                 params->prof[i].rx_ppp = pfcrx;
  93                 params->prof[i].tx_pause = 1;
  94                 params->prof[i].tx_ppp = pfctx;
  95                 params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
  96                 params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
  97                 params->prof[i].tx_ring_num = MLX4_EN_NUM_TX_RINGS +
  98                         (!!pfcrx) * MLX4_EN_NUM_PPP_RINGS;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
 105                           enum mlx4_dev_event event, int port)
 106 {
 107         struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
 108         struct mlx4_en_priv *priv;
 109
 110         if (!mdev->pndev[port])
 111                 return;
 112
 113         priv = netdev_priv(mdev->pndev[port]);
 114         switch (event) {
 115         case MLX4_DEV_EVENT_PORT_UP:
 116         case MLX4_DEV_EVENT_PORT_DOWN:
 117                 /* To prevent races, we poll the link state in a separate
 118                   task rather than changing it here */
 119                 priv->link_state = event;
 120                 queue_work(mdev->workqueue, &priv->linkstate_task);
 121                 break;
 122
 123         case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
 124                 mlx4_err(mdev, "Internal error detected, restarting device\n");
 125                 break;
 126
 127         default:
 128                 mlx4_warn(mdev, "Unhandled event: %d\n", event);
 129         }
 130 }
 131
 132 static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
 133 {
 134         struct mlx4_en_dev *mdev = endev_ptr;
 135         int i;
 136
 137         mutex_lock(&mdev->state_lock);
 138         mdev->device_up = false;
 139         mutex_unlock(&mdev->state_lock);
 140
 141         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
 142                 if (mdev->pndev[i])
 143                         mlx4_en_destroy_netdev(mdev->pndev[i]);
 144
 145         flush_workqueue(mdev->workqueue);
 146         destroy_workqueue(mdev->workqueue);
 147         mlx4_mr_free(dev, &mdev->mr);
 148         mlx4_uar_free(dev, &mdev->priv_uar);
 149         mlx4_pd_free(dev, mdev->priv_pdn);
 150         kfree(mdev);
 151 }
 152
 153 static void *mlx4_en_add(struct mlx4_dev *dev)
 154 {
 155         static int mlx4_en_version_printed;
 156         struct mlx4_en_dev *mdev;
 157         int i;
 158         int err;
 159
 160         if (!mlx4_en_version_printed) {
 161                 printk(KERN_INFO "%s", mlx4_en_version);
 162                 mlx4_en_version_printed++;
 163         }
 164
 165         mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
 166         if (!mdev) {
 167                 dev_err(&dev->pdev->dev, "Device struct alloc failed, "
 168                         "aborting.\n");
 169                 err = -ENOMEM;
 170                 goto err_free_res;
 171         }
 172
 173         if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
 174                 goto err_free_dev;
 175
 176         if (mlx4_uar_alloc(dev, &mdev->priv_uar))
 177                 goto err_pd;
 178
 179         mdev->uar_map = ioremap(mdev->priv_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
 180         if (!mdev->uar_map)
 181                 goto err_uar;
 182         spin_lock_init(&mdev->uar_lock);
 183
 184         mdev->dev = dev;
 185         mdev->dma_device = &(dev->pdev->dev);
 186         mdev->pdev = dev->pdev;
 187         mdev->device_up = false;
 188
 189         mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
 190         if (!mdev->LSO_support)
 191                 mlx4_warn(mdev, "LSO not supported, please upgrade to later "
 192                                 "FW version to enable LSO\n");
 193
 194         if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
 195                          MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
 196                          0, 0, &mdev->mr)) {
 197                 mlx4_err(mdev, "Failed allocating memory region\n");
 198                 goto err_uar;
 199         }
 200         if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
 201                 mlx4_err(mdev, "Failed enabling memory region\n");
 202                 goto err_mr;
 203         }
 204
 205         /* Build device profile according to supplied module parameters */
 206         err = mlx4_en_get_profile(mdev);
 207         if (err) {
 208                 mlx4_err(mdev, "Bad module parameters, aborting.\n");
 209                 goto err_mr;
 210         }
 211
 212         /* Configure wich ports to start according to module parameters */
 213         mdev->port_cnt = 0;
 214         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
 215                 mdev->port_cnt++;
 216
 217         /* If we did not receive an explicit number of Rx rings, default to
 218          * the number of completion vectors populated by the mlx4_core */
 219         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 220                 mlx4_info(mdev, "Using %d tx rings for port:%d\n",
 221                           mdev->profile.prof[i].tx_ring_num, i);
 222                 mdev->profile.prof[i].rx_ring_num = min_t(int,
 223                         roundup_pow_of_two(dev->caps.num_comp_vectors),
 224                         MAX_RX_RINGS);
 225                 mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
 226                           mdev->profile.prof[i].rx_ring_num, i);
 227         }
 228
 229         /* Create our own workqueue for reset/multicast tasks
 230          * Note: we cannot use the shared workqueue because of deadlocks caused
 231          *       by the rtnl lock */
 232         mdev->workqueue = create_singlethread_workqueue("mlx4_en");
 233         if (!mdev->workqueue) {
 234                 err = -ENOMEM;
 235                 goto err_mr;
 236         }
 237
 238         /* At this stage all non-port specific tasks are complete:
 239          * mark the card state as up */
 240         mutex_init(&mdev->state_lock);
 241         mdev->device_up = true;
 242
 243         /* Setup ports */
 244
 245         /* Create a netdev for each port */
 246         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 247                 mlx4_info(mdev, "Activating port:%d\n", i);
 248                 if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
 249                         mdev->pndev[i] = NULL;
 250         }
 251         return mdev;
 252
 253 err_mr:
 254         mlx4_mr_free(dev, &mdev->mr);
 255 err_uar:
 256         mlx4_uar_free(dev, &mdev->priv_uar);
 257 err_pd:
 258         mlx4_pd_free(dev, mdev->priv_pdn);
 259 err_free_dev:
 260         kfree(mdev);
 261 err_free_res:
 262         return NULL;
 263 }
 264
 265 static struct mlx4_interface mlx4_en_interface = {
 266         .add    = mlx4_en_add,
 267         .remove = mlx4_en_remove,
 268         .event  = mlx4_en_event,
 269 };
 270
 271 static int __init mlx4_en_init(void)
 272 {
 273         return mlx4_register_interface(&mlx4_en_interface);
 274 }
 275
 276 static void __exit mlx4_en_cleanup(void)
 277 {
 278         mlx4_unregister_interface(&mlx4_en_interface);
 279 }
 280
 281 module_init(mlx4_en_init);
 282 module_exit(mlx4_en_cleanup);
 283