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
  39 #include <linux/mlx4/driver.h>
  40 #include <linux/mlx4/device.h>
  41 #include <linux/mlx4/cmd.h>
  42
  43 #include "mlx4_en.h"
  44
  45 MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
  46 MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
  47 MODULE_LICENSE("Dual BSD/GPL");
  48 MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");
  49
  50 static const char mlx4_en_version[] =
  51         DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
  52         DRV_VERSION " (" DRV_RELDATE ")\n";
  53
  54 #define MLX4_EN_PARM_INT(X, def_val, desc) \
  55         static unsigned int X = def_val;\
  56         module_param(X , uint, 0444); \
  57         MODULE_PARM_DESC(X, desc);
  58
  59
  60 /*
  61  * Device scope module parameters
  62  */
  63
  64
  65 /* Use a XOR rathern than Toeplitz hash function for RSS */
  66 MLX4_EN_PARM_INT(rss_xor, 0, "Use XOR hash function for RSS");
  67
  68 /* RSS hash type mask - default to <saddr, daddr, sport, dport> */
  69 MLX4_EN_PARM_INT(rss_mask, 0xf, "RSS hash type bitmask");
  70
  71 /* Number of LRO sessions per Rx ring (rounded up to a power of two) */
  72 MLX4_EN_PARM_INT(num_lro, MLX4_EN_MAX_LRO_DESCRIPTORS,
  73                  "Number of LRO sessions per ring or disabled (0)");
  74
  75 /* Priority pausing */
  76 MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
  77                            " Per priority bit mask");
  78 MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
  79                            " Per priority bit mask");
  80
  81 static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
  82 {
  83         struct mlx4_en_profile *params = &mdev->profile;
  84         int i;
  85
  86         params->rss_xor = (rss_xor != 0);
  87         params->rss_mask = rss_mask & 0x1f;
  88         params->num_lro = min_t(int, num_lro , MLX4_EN_MAX_LRO_DESCRIPTORS);
  89         for (i = 1; i <= MLX4_MAX_PORTS; i++) {
  90                 params->prof[i].rx_pause = 1;
  91                 params->prof[i].rx_ppp = pfcrx;
  92                 params->prof[i].tx_pause = 1;
  93                 params->prof[i].tx_ppp = pfctx;
  94                 params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
  95                 params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
  96         }
  97         if (pfcrx || pfctx) {
  98                 params->prof[1].tx_ring_num = MLX4_EN_TX_RING_NUM;
  99                 params->prof[2].tx_ring_num = MLX4_EN_TX_RING_NUM;
 100         } else {
 101                 params->prof[1].tx_ring_num = 1;
 102                 params->prof[2].tx_ring_num = 1;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
 109                           enum mlx4_dev_event event, int port)
 110 {
 111         struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
 112         struct mlx4_en_priv *priv;
 113
 114         if (!mdev->pndev[port])
 115                 return;
 116
 117         priv = netdev_priv(mdev->pndev[port]);
 118         switch (event) {
 119         case MLX4_DEV_EVENT_PORT_UP:
 120         case MLX4_DEV_EVENT_PORT_DOWN:
 121                 /* To prevent races, we poll the link state in a separate
 122                   task rather than changing it here */
 123                 priv->link_state = event;
 124                 queue_work(mdev->workqueue, &priv->linkstate_task);
 125                 break;
 126
 127         case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
 128                 mlx4_err(mdev, "Internal error detected, restarting device\n");
 129                 break;
 130
 131         default:
 132                 mlx4_warn(mdev, "Unhandled event: %d\n", event);
 133         }
 134 }
 135
 136 static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
 137 {
 138         struct mlx4_en_dev *mdev = endev_ptr;
 139         int i;
 140
 141         mutex_lock(&mdev->state_lock);
 142         mdev->device_up = false;
 143         mutex_unlock(&mdev->state_lock);
 144
 145         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
 146                 if (mdev->pndev[i])
 147                         mlx4_en_destroy_netdev(mdev->pndev[i]);
 148
 149         flush_workqueue(mdev->workqueue);
 150         destroy_workqueue(mdev->workqueue);
 151         mlx4_mr_free(dev, &mdev->mr);
 152         mlx4_uar_free(dev, &mdev->priv_uar);
 153         mlx4_pd_free(dev, mdev->priv_pdn);
 154         kfree(mdev);
 155 }
 156
 157 static void *mlx4_en_add(struct mlx4_dev *dev)
 158 {
 159         static int mlx4_en_version_printed;
 160         struct mlx4_en_dev *mdev;
 161         int i;
 162         int err;
 163
 164         if (!mlx4_en_version_printed) {
 165                 printk(KERN_INFO "%s", mlx4_en_version);
 166                 mlx4_en_version_printed++;
 167         }
 168
 169         mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
 170         if (!mdev) {
 171                 dev_err(&dev->pdev->dev, "Device struct alloc failed, "
 172                         "aborting.\n");
 173                 err = -ENOMEM;
 174                 goto err_free_res;
 175         }
 176
 177         if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
 178                 goto err_free_dev;
 179
 180         if (mlx4_uar_alloc(dev, &mdev->priv_uar))
 181                 goto err_pd;
 182
 183         mdev->uar_map = ioremap(mdev->priv_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
 184         if (!mdev->uar_map)
 185                 goto err_uar;
 186         spin_lock_init(&mdev->uar_lock);
 187
 188         mdev->dev = dev;
 189         mdev->dma_device = &(dev->pdev->dev);
 190         mdev->pdev = dev->pdev;
 191         mdev->device_up = false;
 192
 193         mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
 194         if (!mdev->LSO_support)
 195                 mlx4_warn(mdev, "LSO not supported, please upgrade to later "
 196                                 "FW version to enable LSO\n");
 197
 198         if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
 199                          MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
 200                          0, 0, &mdev->mr)) {
 201                 mlx4_err(mdev, "Failed allocating memory region\n");
 202                 goto err_uar;
 203         }
 204         if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
 205                 mlx4_err(mdev, "Failed enabling memory region\n");
 206                 goto err_mr;
 207         }
 208
 209         /* Build device profile according to supplied module parameters */
 210         err = mlx4_en_get_profile(mdev);
 211         if (err) {
 212                 mlx4_err(mdev, "Bad module parameters, aborting.\n");
 213                 goto err_mr;
 214         }
 215
 216         /* Configure wich ports to start according to module parameters */
 217         mdev->port_cnt = 0;
 218         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
 219                 mdev->port_cnt++;
 220
 221         /* If we did not receive an explicit number of Rx rings, default to
 222          * the number of completion vectors populated by the mlx4_core */
 223         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 224                 mlx4_info(mdev, "Using %d tx rings for port:%d\n",
 225                           mdev->profile.prof[i].tx_ring_num, i);
 226                 mdev->profile.prof[i].rx_ring_num =
 227                         min_t(int, dev->caps.num_comp_vectors, MAX_RX_RINGS);
 228                 mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
 229                           mdev->profile.prof[i].rx_ring_num, i);
 230         }
 231
 232         /* Create our own workqueue for reset/multicast tasks
 233          * Note: we cannot use the shared workqueue because of deadlocks caused
 234          *       by the rtnl lock */
 235         mdev->workqueue = create_singlethread_workqueue("mlx4_en");
 236         if (!mdev->workqueue) {
 237                 err = -ENOMEM;
 238                 goto err_mr;
 239         }
 240
 241         /* At this stage all non-port specific tasks are complete:
 242          * mark the card state as up */
 243         mutex_init(&mdev->state_lock);
 244         mdev->device_up = true;
 245
 246         /* Setup ports */
 247
 248         /* Create a netdev for each port */
 249         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 250                 mlx4_info(mdev, "Activating port:%d\n", i);
 251                 if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i])) {
 252                         mdev->pndev[i] = NULL;
 253                         goto err_free_netdev;
 254                 }
 255         }
 256         return mdev;
 257
 258
 259 err_free_netdev:
 260         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 261                 if (mdev->pndev[i])
 262                         mlx4_en_destroy_netdev(mdev->pndev[i]);
 263         }
 264
 265         mutex_lock(&mdev->state_lock);
 266         mdev->device_up = false;
 267         mutex_unlock(&mdev->state_lock);
 268         flush_workqueue(mdev->workqueue);
 269
 270         /* Stop event queue before we drop down to release shared SW state */
 271         destroy_workqueue(mdev->workqueue);
 272
 273 err_mr:
 274         mlx4_mr_free(dev, &mdev->mr);
 275 err_uar:
 276         mlx4_uar_free(dev, &mdev->priv_uar);
 277 err_pd:
 278         mlx4_pd_free(dev, mdev->priv_pdn);
 279 err_free_dev:
 280         kfree(mdev);
 281 err_free_res:
 282         return NULL;
 283 }
 284
 285 static struct mlx4_interface mlx4_en_interface = {
 286         .add    = mlx4_en_add,
 287         .remove = mlx4_en_remove,
 288         .event  = mlx4_en_event,
 289 };
 290
 291 static int __init mlx4_en_init(void)
 292 {
 293         return mlx4_register_interface(&mlx4_en_interface);
 294 }
 295
 296 static void __exit mlx4_en_cleanup(void)
 297 {
 298         mlx4_unregister_interface(&mlx4_en_interface);
 299 }
 300
 301 module_init(mlx4_en_init);
 302 module_exit(mlx4_en_cleanup);
 303