lib/librte_eal/linuxapp/kni/kni_misc.c

   1 /*-
   2  * GPL LICENSE SUMMARY
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of version 2 of the GNU General Public License as
   8  *   published by the Free Software Foundation.
   9  *
  10  *   This program is distributed in the hope that it will be useful, but
  11  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *   General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  *   The full GNU General Public License is included in this distribution
  19  *   in the file called LICENSE.GPL.
  20  *
  21  *   Contact Information:
  22  *   Intel Corporation
  23  */
  24
  25 #include <linux/version.h>
  26 #include <linux/module.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/pci.h>
  31 #include <linux/kthread.h>
  32 #include <linux/rwsem.h>
  33 #include <linux/mutex.h>
  34 #include <linux/nsproxy.h>
  35 #include <net/net_namespace.h>
  36 #include <net/netns/generic.h>
  37
  38 #include <exec-env/rte_kni_common.h>
  39
  40 #include "compat.h"
  41 #include "kni_dev.h"
  42
  43 MODULE_LICENSE("Dual BSD/GPL");
  44 MODULE_AUTHOR("Intel Corporation");
  45 MODULE_DESCRIPTION("Kernel Module for managing kni devices");
  46
  47 #define KNI_RX_LOOP_NUM 1000
  48
  49 #define KNI_MAX_DEVICES 32
  50
  51 extern const struct pci_device_id ixgbe_pci_tbl[];
  52 extern const struct pci_device_id igb_pci_tbl[];
  53
  54 /* loopback mode */
  55 static char *lo_mode;
  56
  57 /* Kernel thread mode */
  58 static char *kthread_mode;
  59 static unsigned int multiple_kthread_on;
  60
  61 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
  62
  63 static int kni_net_id;
  64
  65 struct kni_net {
  66         unsigned long device_in_use; /* device in use flag */
  67         struct mutex kni_kthread_lock;
  68         struct task_struct *kni_kthread;
  69         struct rw_semaphore kni_list_lock;
  70         struct list_head kni_list_head;
  71 };
  72
  73 static int __net_init
  74 kni_init_net(struct net *net)
  75 {
  76 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
  77         struct kni_net *knet = net_generic(net, kni_net_id);
  78
  79         memset(knet, 0, sizeof(*knet));
  80 #else
  81         struct kni_net *knet;
  82         int ret;
  83
  84         knet = kzalloc(sizeof(struct kni_net), GFP_KERNEL);
  85         if (!knet) {
  86                 ret = -ENOMEM;
  87                 return ret;
  88         }
  89 #endif
  90
  91         /* Clear the bit of device in use */
  92         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
  93
  94         mutex_init(&knet->kni_kthread_lock);
  95
  96         init_rwsem(&knet->kni_list_lock);
  97         INIT_LIST_HEAD(&knet->kni_list_head);
  98
  99 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 100         return 0;
 101 #else
 102         ret = net_assign_generic(net, kni_net_id, knet);
 103         if (ret < 0)
 104                 kfree(knet);
 105
 106         return ret;
 107 #endif
 108 }
 109
 110 static void __net_exit
 111 kni_exit_net(struct net *net)
 112 {
 113         struct kni_net *knet = net_generic(net, kni_net_id);
 114
 115         mutex_destroy(&knet->kni_kthread_lock);
 116 #ifndef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 117         kfree(knet);
 118 #endif
 119 }
 120
 121 static struct pernet_operations kni_net_ops = {
 122         .init = kni_init_net,
 123         .exit = kni_exit_net,
 124 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 125         .id   = &kni_net_id,
 126         .size = sizeof(struct kni_net),
 127 #endif
 128 };
 129
 130 static int
 131 kni_thread_single(void *data)
 132 {
 133         struct kni_net *knet = data;
 134         int j;
 135         struct kni_dev *dev;
 136
 137         while (!kthread_should_stop()) {
 138                 down_read(&knet->kni_list_lock);
 139                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 140                         list_for_each_entry(dev, &knet->kni_list_head, list) {
 141 #ifdef RTE_KNI_VHOST
 142                                 kni_chk_vhost_rx(dev);
 143 #else
 144                                 kni_net_rx(dev);
 145 #endif
 146                                 kni_net_poll_resp(dev);
 147                         }
 148                 }
 149                 up_read(&knet->kni_list_lock);
 150 #ifdef RTE_KNI_PREEMPT_DEFAULT
 151                 /* reschedule out for a while */
 152                 schedule_timeout_interruptible(
 153                         usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
 154 #endif
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int
 161 kni_thread_multiple(void *param)
 162 {
 163         int j;
 164         struct kni_dev *dev = (struct kni_dev *)param;
 165
 166         while (!kthread_should_stop()) {
 167                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 168 #ifdef RTE_KNI_VHOST
 169                         kni_chk_vhost_rx(dev);
 170 #else
 171                         kni_net_rx(dev);
 172 #endif
 173                         kni_net_poll_resp(dev);
 174                 }
 175 #ifdef RTE_KNI_PREEMPT_DEFAULT
 176                 schedule_timeout_interruptible(
 177                         usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
 178 #endif
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int
 185 kni_open(struct inode *inode, struct file *file)
 186 {
 187         struct net *net = current->nsproxy->net_ns;
 188         struct kni_net *knet = net_generic(net, kni_net_id);
 189
 190         /* kni device can be opened by one user only per netns */
 191         if (test_and_set_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use))
 192                 return -EBUSY;
 193
 194         file->private_data = get_net(net);
 195         pr_debug("/dev/kni opened\n");
 196
 197         return 0;
 198 }
 199
 200 static int
 201 kni_dev_remove(struct kni_dev *dev)
 202 {
 203         if (!dev)
 204                 return -ENODEV;
 205
 206         if (dev->pci_dev) {
 207                 if (pci_match_id(ixgbe_pci_tbl, dev->pci_dev))
 208                         ixgbe_kni_remove(dev->pci_dev);
 209                 else if (pci_match_id(igb_pci_tbl, dev->pci_dev))
 210                         igb_kni_remove(dev->pci_dev);
 211         }
 212
 213         if (dev->net_dev) {
 214                 unregister_netdev(dev->net_dev);
 215                 free_netdev(dev->net_dev);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int
 222 kni_release(struct inode *inode, struct file *file)
 223 {
 224         struct net *net = file->private_data;
 225         struct kni_net *knet = net_generic(net, kni_net_id);
 226         struct kni_dev *dev, *n;
 227
 228         /* Stop kernel thread for single mode */
 229         if (multiple_kthread_on == 0) {
 230                 mutex_lock(&knet->kni_kthread_lock);
 231                 /* Stop kernel thread */
 232                 if (knet->kni_kthread != NULL) {
 233                         kthread_stop(knet->kni_kthread);
 234                         knet->kni_kthread = NULL;
 235                 }
 236                 mutex_unlock(&knet->kni_kthread_lock);
 237         }
 238
 239         down_write(&knet->kni_list_lock);
 240         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 241                 /* Stop kernel thread for multiple mode */
 242                 if (multiple_kthread_on && dev->pthread != NULL) {
 243                         kthread_stop(dev->pthread);
 244                         dev->pthread = NULL;
 245                 }
 246
 247 #ifdef RTE_KNI_VHOST
 248                 kni_vhost_backend_release(dev);
 249 #endif
 250                 kni_dev_remove(dev);
 251                 list_del(&dev->list);
 252         }
 253         up_write(&knet->kni_list_lock);
 254
 255         /* Clear the bit of device in use */
 256         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 257
 258         put_net(net);
 259         pr_debug("/dev/kni closed\n");
 260
 261         return 0;
 262 }
 263
 264 static int
 265 kni_check_param(struct kni_dev *kni, struct rte_kni_device_info *dev)
 266 {
 267         if (!kni || !dev)
 268                 return -1;
 269
 270         /* Check if network name has been used */
 271         if (!strncmp(kni->name, dev->name, RTE_KNI_NAMESIZE)) {
 272                 pr_err("KNI name %s duplicated\n", dev->name);
 273                 return -1;
 274         }
 275
 276         return 0;
 277 }
 278
 279 static int
 280 kni_run_thread(struct kni_net *knet, struct kni_dev *kni, uint8_t force_bind)
 281 {
 282         /**
 283          * Create a new kernel thread for multiple mode, set its core affinity,
 284          * and finally wake it up.
 285          */
 286         if (multiple_kthread_on) {
 287                 kni->pthread = kthread_create(kni_thread_multiple,
 288                         (void *)kni, "kni_%s", kni->name);
 289                 if (IS_ERR(kni->pthread)) {
 290                         kni_dev_remove(kni);
 291                         return -ECANCELED;
 292                 }
 293
 294                 if (force_bind)
 295                         kthread_bind(kni->pthread, kni->core_id);
 296                 wake_up_process(kni->pthread);
 297         } else {
 298                 mutex_lock(&knet->kni_kthread_lock);
 299
 300                 if (knet->kni_kthread == NULL) {
 301                         knet->kni_kthread = kthread_create(kni_thread_single,
 302                                 (void *)knet, "kni_single");
 303                         if (IS_ERR(knet->kni_kthread)) {
 304                                 mutex_unlock(&knet->kni_kthread_lock);
 305                                 kni_dev_remove(kni);
 306                                 return -ECANCELED;
 307                         }
 308
 309                         if (force_bind)
 310                                 kthread_bind(knet->kni_kthread, kni->core_id);
 311                         wake_up_process(knet->kni_kthread);
 312                 }
 313
 314                 mutex_unlock(&knet->kni_kthread_lock);
 315         }
 316
 317         return 0;
 318 }
 319
 320 static int
 321 kni_ioctl_create(struct net *net,
 322                 unsigned int ioctl_num, unsigned long ioctl_param)
 323 {
 324         struct kni_net *knet = net_generic(net, kni_net_id);
 325         int ret;
 326         struct rte_kni_device_info dev_info;
 327         struct pci_dev *pci = NULL;
 328         struct pci_dev *found_pci = NULL;
 329         struct net_device *net_dev = NULL;
 330         struct net_device *lad_dev = NULL;
 331         struct kni_dev *kni, *dev, *n;
 332
 333         pr_info("Creating kni...\n");
 334         /* Check the buffer size, to avoid warning */
 335         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 336                 return -EINVAL;
 337
 338         /* Copy kni info from user space */
 339         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 340         if (ret) {
 341                 pr_err("copy_from_user in kni_ioctl_create");
 342                 return -EIO;
 343         }
 344
 345         /**
 346          * Check if the cpu core id is valid for binding.
 347          */
 348         if (dev_info.force_bind && !cpu_online(dev_info.core_id)) {
 349                 pr_err("cpu %u is not online\n", dev_info.core_id);
 350                 return -EINVAL;
 351         }
 352
 353         /* Check if it has been created */
 354         down_read(&knet->kni_list_lock);
 355         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 356                 if (kni_check_param(dev, &dev_info) < 0) {
 357                         up_read(&knet->kni_list_lock);
 358                         return -EINVAL;
 359                 }
 360         }
 361         up_read(&knet->kni_list_lock);
 362
 363         net_dev = alloc_netdev(sizeof(struct kni_dev), dev_info.name,
 364 #ifdef NET_NAME_UNKNOWN
 365                                                         NET_NAME_UNKNOWN,
 366 #endif
 367                                                         kni_net_init);
 368         if (net_dev == NULL) {
 369                 pr_err("error allocating device \"%s\"\n", dev_info.name);
 370                 return -EBUSY;
 371         }
 372
 373         dev_net_set(net_dev, net);
 374
 375         kni = netdev_priv(net_dev);
 376
 377         kni->net_dev = net_dev;
 378         kni->group_id = dev_info.group_id;
 379         kni->core_id = dev_info.core_id;
 380         strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
 381
 382         /* Translate user space info into kernel space info */
 383         kni->tx_q = phys_to_virt(dev_info.tx_phys);
 384         kni->rx_q = phys_to_virt(dev_info.rx_phys);
 385         kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
 386         kni->free_q = phys_to_virt(dev_info.free_phys);
 387
 388         kni->req_q = phys_to_virt(dev_info.req_phys);
 389         kni->resp_q = phys_to_virt(dev_info.resp_phys);
 390         kni->sync_va = dev_info.sync_va;
 391         kni->sync_kva = phys_to_virt(dev_info.sync_phys);
 392
 393 #ifdef RTE_KNI_VHOST
 394         kni->vhost_queue = NULL;
 395         kni->vq_status = BE_STOP;
 396 #endif
 397         kni->mbuf_size = dev_info.mbuf_size;
 398
 399         pr_debug("tx_phys:      0x%016llx, tx_q addr:      0x%p\n",
 400                 (unsigned long long) dev_info.tx_phys, kni->tx_q);
 401         pr_debug("rx_phys:      0x%016llx, rx_q addr:      0x%p\n",
 402                 (unsigned long long) dev_info.rx_phys, kni->rx_q);
 403         pr_debug("alloc_phys:   0x%016llx, alloc_q addr:   0x%p\n",
 404                 (unsigned long long) dev_info.alloc_phys, kni->alloc_q);
 405         pr_debug("free_phys:    0x%016llx, free_q addr:    0x%p\n",
 406                 (unsigned long long) dev_info.free_phys, kni->free_q);
 407         pr_debug("req_phys:     0x%016llx, req_q addr:     0x%p\n",
 408                 (unsigned long long) dev_info.req_phys, kni->req_q);
 409         pr_debug("resp_phys:    0x%016llx, resp_q addr:    0x%p\n",
 410                 (unsigned long long) dev_info.resp_phys, kni->resp_q);
 411         pr_debug("mbuf_size:    %u\n", kni->mbuf_size);
 412
 413         pr_debug("PCI: %02x:%02x.%02x %04x:%04x\n",
 414                                         dev_info.bus,
 415                                         dev_info.devid,
 416                                         dev_info.function,
 417                                         dev_info.vendor_id,
 418                                         dev_info.device_id);
 419
 420         pci = pci_get_device(dev_info.vendor_id, dev_info.device_id, NULL);
 421
 422         /* Support Ethtool */
 423         while (pci) {
 424                 pr_debug("pci_bus: %02x:%02x:%02x\n",
 425                                         pci->bus->number,
 426                                         PCI_SLOT(pci->devfn),
 427                                         PCI_FUNC(pci->devfn));
 428
 429                 if ((pci->bus->number == dev_info.bus) &&
 430                         (PCI_SLOT(pci->devfn) == dev_info.devid) &&
 431                         (PCI_FUNC(pci->devfn) == dev_info.function)) {
 432                         found_pci = pci;
 433
 434                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 435                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 436                         else if (pci_match_id(igb_pci_tbl, found_pci))
 437                                 ret = igb_kni_probe(found_pci, &lad_dev);
 438                         else
 439                                 ret = -1;
 440
 441                         pr_debug("PCI found: pci=0x%p, lad_dev=0x%p\n",
 442                                                         pci, lad_dev);
 443                         if (ret == 0) {
 444                                 kni->lad_dev = lad_dev;
 445                                 kni_set_ethtool_ops(kni->net_dev);
 446                         } else {
 447                                 pr_err("Device not supported by ethtool");
 448                                 kni->lad_dev = NULL;
 449                         }
 450
 451                         kni->pci_dev = found_pci;
 452                         kni->device_id = dev_info.device_id;
 453                         break;
 454                 }
 455                 pci = pci_get_device(dev_info.vendor_id,
 456                                 dev_info.device_id, pci);
 457         }
 458         if (pci)
 459                 pci_dev_put(pci);
 460
 461         if (kni->lad_dev)
 462                 ether_addr_copy(net_dev->dev_addr, kni->lad_dev->dev_addr);
 463         else
 464                 /*
 465                  * Generate random mac address. eth_random_addr() is the newer
 466                  * version of generating mac address in linux kernel.
 467                  */
 468                 random_ether_addr(net_dev->dev_addr);
 469
 470         ret = register_netdev(net_dev);
 471         if (ret) {
 472                 pr_err("error %i registering device \"%s\"\n",
 473                                         ret, dev_info.name);
 474                 kni->net_dev = NULL;
 475                 kni_dev_remove(kni);
 476                 free_netdev(net_dev);
 477                 return -ENODEV;
 478         }
 479
 480 #ifdef RTE_KNI_VHOST
 481         kni_vhost_init(kni);
 482 #endif
 483
 484         ret = kni_run_thread(knet, kni, dev_info.force_bind);
 485         if (ret != 0)
 486                 return ret;
 487
 488         down_write(&knet->kni_list_lock);
 489         list_add(&kni->list, &knet->kni_list_head);
 490         up_write(&knet->kni_list_lock);
 491
 492         return 0;
 493 }
 494
 495 static int
 496 kni_ioctl_release(struct net *net,
 497                 unsigned int ioctl_num, unsigned long ioctl_param)
 498 {
 499         struct kni_net *knet = net_generic(net, kni_net_id);
 500         int ret = -EINVAL;
 501         struct kni_dev *dev, *n;
 502         struct rte_kni_device_info dev_info;
 503
 504         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 505                 return -EINVAL;
 506
 507         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 508         if (ret) {
 509                 pr_err("copy_from_user in kni_ioctl_release");
 510                 return -EIO;
 511         }
 512
 513         /* Release the network device according to its name */
 514         if (strlen(dev_info.name) == 0)
 515                 return ret;
 516
 517         down_write(&knet->kni_list_lock);
 518         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 519                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 520                         continue;
 521
 522                 if (multiple_kthread_on && dev->pthread != NULL) {
 523                         kthread_stop(dev->pthread);
 524                         dev->pthread = NULL;
 525                 }
 526
 527 #ifdef RTE_KNI_VHOST
 528                 kni_vhost_backend_release(dev);
 529 #endif
 530                 kni_dev_remove(dev);
 531                 list_del(&dev->list);
 532                 ret = 0;
 533                 break;
 534         }
 535         up_write(&knet->kni_list_lock);
 536         pr_info("%s release kni named %s\n",
 537                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 538
 539         return ret;
 540 }
 541
 542 static int
 543 kni_ioctl(struct inode *inode,
 544         unsigned int ioctl_num,
 545         unsigned long ioctl_param)
 546 {
 547         int ret = -EINVAL;
 548         struct net *net = current->nsproxy->net_ns;
 549
 550         pr_debug("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 551
 552         /*
 553          * Switch according to the ioctl called
 554          */
 555         switch (_IOC_NR(ioctl_num)) {
 556         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 557                 /* For test only, not used */
 558                 break;
 559         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 560                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 561                 break;
 562         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 563                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 564                 break;
 565         default:
 566                 pr_debug("IOCTL default\n");
 567                 break;
 568         }
 569
 570         return ret;
 571 }
 572
 573 static int
 574 kni_compat_ioctl(struct inode *inode,
 575                 unsigned int ioctl_num,
 576                 unsigned long ioctl_param)
 577 {
 578         /* 32 bits app on 64 bits OS to be supported later */
 579         pr_debug("Not implemented.\n");
 580
 581         return -EINVAL;
 582 }
 583
 584 static const struct file_operations kni_fops = {
 585         .owner = THIS_MODULE,
 586         .open = kni_open,
 587         .release = kni_release,
 588         .unlocked_ioctl = (void *)kni_ioctl,
 589         .compat_ioctl = (void *)kni_compat_ioctl,
 590 };
 591
 592 static struct miscdevice kni_misc = {
 593         .minor = MISC_DYNAMIC_MINOR,
 594         .name = KNI_DEVICE,
 595         .fops = &kni_fops,
 596 };
 597
 598 static int __init
 599 kni_parse_kthread_mode(void)
 600 {
 601         if (!kthread_mode)
 602                 return 0;
 603
 604         if (strcmp(kthread_mode, "single") == 0)
 605                 return 0;
 606         else if (strcmp(kthread_mode, "multiple") == 0)
 607                 multiple_kthread_on = 1;
 608         else
 609                 return -1;
 610
 611         return 0;
 612 }
 613
 614 static int __init
 615 kni_init(void)
 616 {
 617         int rc;
 618
 619         if (kni_parse_kthread_mode() < 0) {
 620                 pr_err("Invalid parameter for kthread_mode\n");
 621                 return -EINVAL;
 622         }
 623
 624         if (multiple_kthread_on == 0)
 625                 pr_debug("Single kernel thread for all KNI devices\n");
 626         else
 627                 pr_debug("Multiple kernel thread mode enabled\n");
 628
 629 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 630         rc = register_pernet_subsys(&kni_net_ops);
 631 #else
 632         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 633 #endif
 634         if (rc)
 635                 return -EPERM;
 636
 637         rc = misc_register(&kni_misc);
 638         if (rc != 0) {
 639                 pr_err("Misc registration failed\n");
 640                 goto out;
 641         }
 642
 643         /* Configure the lo mode according to the input parameter */
 644         kni_net_config_lo_mode(lo_mode);
 645
 646         return 0;
 647
 648 out:
 649 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 650         unregister_pernet_subsys(&kni_net_ops);
 651 #else
 652         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 653 #endif
 654         return rc;
 655 }
 656
 657 static void __exit
 658 kni_exit(void)
 659 {
 660         misc_deregister(&kni_misc);
 661 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 662         unregister_pernet_subsys(&kni_net_ops);
 663 #else
 664         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 665 #endif
 666 }
 667
 668 module_init(kni_init);
 669 module_exit(kni_exit);
 670
 671 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 672 MODULE_PARM_DESC(lo_mode,
 673 "KNI loopback mode (default=lo_mode_none):\n"
 674 "    lo_mode_none        Kernel loopback disabled\n"
 675 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 676 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 677 "\n"
 678 );
 679
 680 module_param(kthread_mode, charp, S_IRUGO);
 681 MODULE_PARM_DESC(kthread_mode,
 682 "Kernel thread mode (default=single):\n"
 683 "    single    Single kernel thread mode enabled.\n"
 684 "    multiple  Multiple kernel thread mode enabled.\n"
 685 "\n"
 686 );