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 uint32_t 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 __maybe_unused;
 114
 115         knet = net_generic(net, kni_net_id);
 116         mutex_destroy(&knet->kni_kthread_lock);
 117
 118 #ifndef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 119         kfree(knet);
 120 #endif
 121 }
 122
 123 static struct pernet_operations kni_net_ops = {
 124         .init = kni_init_net,
 125         .exit = kni_exit_net,
 126 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 127         .id   = &kni_net_id,
 128         .size = sizeof(struct kni_net),
 129 #endif
 130 };
 131
 132 static int
 133 kni_thread_single(void *data)
 134 {
 135         struct kni_net *knet = data;
 136         int j;
 137         struct kni_dev *dev;
 138
 139         while (!kthread_should_stop()) {
 140                 down_read(&knet->kni_list_lock);
 141                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 142                         list_for_each_entry(dev, &knet->kni_list_head, list) {
 143 #ifdef RTE_KNI_VHOST
 144                                 kni_chk_vhost_rx(dev);
 145 #else
 146                                 kni_net_rx(dev);
 147 #endif
 148                                 kni_net_poll_resp(dev);
 149                         }
 150                 }
 151                 up_read(&knet->kni_list_lock);
 152 #ifdef RTE_KNI_PREEMPT_DEFAULT
 153                 /* reschedule out for a while */
 154                 schedule_timeout_interruptible(
 155                         usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
 156 #endif
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int
 163 kni_thread_multiple(void *param)
 164 {
 165         int j;
 166         struct kni_dev *dev = (struct kni_dev *)param;
 167
 168         while (!kthread_should_stop()) {
 169                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 170 #ifdef RTE_KNI_VHOST
 171                         kni_chk_vhost_rx(dev);
 172 #else
 173                         kni_net_rx(dev);
 174 #endif
 175                         kni_net_poll_resp(dev);
 176                 }
 177 #ifdef RTE_KNI_PREEMPT_DEFAULT
 178                 schedule_timeout_interruptible(
 179                         usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
 180 #endif
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int
 187 kni_open(struct inode *inode, struct file *file)
 188 {
 189         struct net *net = current->nsproxy->net_ns;
 190         struct kni_net *knet = net_generic(net, kni_net_id);
 191
 192         /* kni device can be opened by one user only per netns */
 193         if (test_and_set_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use))
 194                 return -EBUSY;
 195
 196         file->private_data = get_net(net);
 197         pr_debug("/dev/kni opened\n");
 198
 199         return 0;
 200 }
 201
 202 static int
 203 kni_dev_remove(struct kni_dev *dev)
 204 {
 205         if (!dev)
 206                 return -ENODEV;
 207
 208 #ifdef CONFIG_RTE_KNI_KMOD_ETHTOOL
 209         if (dev->pci_dev) {
 210                 if (pci_match_id(ixgbe_pci_tbl, dev->pci_dev))
 211                         ixgbe_kni_remove(dev->pci_dev);
 212                 else if (pci_match_id(igb_pci_tbl, dev->pci_dev))
 213                         igb_kni_remove(dev->pci_dev);
 214         }
 215 #endif
 216
 217         if (dev->net_dev) {
 218                 unregister_netdev(dev->net_dev);
 219                 free_netdev(dev->net_dev);
 220         }
 221
 222         return 0;
 223 }
 224
 225 static int
 226 kni_release(struct inode *inode, struct file *file)
 227 {
 228         struct net *net = file->private_data;
 229         struct kni_net *knet = net_generic(net, kni_net_id);
 230         struct kni_dev *dev, *n;
 231
 232         /* Stop kernel thread for single mode */
 233         if (multiple_kthread_on == 0) {
 234                 mutex_lock(&knet->kni_kthread_lock);
 235                 /* Stop kernel thread */
 236                 if (knet->kni_kthread != NULL) {
 237                         kthread_stop(knet->kni_kthread);
 238                         knet->kni_kthread = NULL;
 239                 }
 240                 mutex_unlock(&knet->kni_kthread_lock);
 241         }
 242
 243         down_write(&knet->kni_list_lock);
 244         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 245                 /* Stop kernel thread for multiple mode */
 246                 if (multiple_kthread_on && dev->pthread != NULL) {
 247                         kthread_stop(dev->pthread);
 248                         dev->pthread = NULL;
 249                 }
 250
 251 #ifdef RTE_KNI_VHOST
 252                 kni_vhost_backend_release(dev);
 253 #endif
 254                 kni_dev_remove(dev);
 255                 list_del(&dev->list);
 256         }
 257         up_write(&knet->kni_list_lock);
 258
 259         /* Clear the bit of device in use */
 260         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 261
 262         put_net(net);
 263         pr_debug("/dev/kni closed\n");
 264
 265         return 0;
 266 }
 267
 268 static int
 269 kni_check_param(struct kni_dev *kni, struct rte_kni_device_info *dev)
 270 {
 271         if (!kni || !dev)
 272                 return -1;
 273
 274         /* Check if network name has been used */
 275         if (!strncmp(kni->name, dev->name, RTE_KNI_NAMESIZE)) {
 276                 pr_err("KNI name %s duplicated\n", dev->name);
 277                 return -1;
 278         }
 279
 280         return 0;
 281 }
 282
 283 static int
 284 kni_run_thread(struct kni_net *knet, struct kni_dev *kni, uint8_t force_bind)
 285 {
 286         /**
 287          * Create a new kernel thread for multiple mode, set its core affinity,
 288          * and finally wake it up.
 289          */
 290         if (multiple_kthread_on) {
 291                 kni->pthread = kthread_create(kni_thread_multiple,
 292                         (void *)kni, "kni_%s", kni->name);
 293                 if (IS_ERR(kni->pthread)) {
 294                         kni_dev_remove(kni);
 295                         return -ECANCELED;
 296                 }
 297
 298                 if (force_bind)
 299                         kthread_bind(kni->pthread, kni->core_id);
 300                 wake_up_process(kni->pthread);
 301         } else {
 302                 mutex_lock(&knet->kni_kthread_lock);
 303
 304                 if (knet->kni_kthread == NULL) {
 305                         knet->kni_kthread = kthread_create(kni_thread_single,
 306                                 (void *)knet, "kni_single");
 307                         if (IS_ERR(knet->kni_kthread)) {
 308                                 mutex_unlock(&knet->kni_kthread_lock);
 309                                 kni_dev_remove(kni);
 310                                 return -ECANCELED;
 311                         }
 312
 313                         if (force_bind)
 314                                 kthread_bind(knet->kni_kthread, kni->core_id);
 315                         wake_up_process(knet->kni_kthread);
 316                 }
 317
 318                 mutex_unlock(&knet->kni_kthread_lock);
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int
 325 kni_ioctl_create(struct net *net, uint32_t ioctl_num,
 326                 unsigned long ioctl_param)
 327 {
 328         struct kni_net *knet = net_generic(net, kni_net_id);
 329         int ret;
 330         struct rte_kni_device_info dev_info;
 331         struct net_device *net_dev = NULL;
 332         struct kni_dev *kni, *dev, *n;
 333
 334         pr_info("Creating kni...\n");
 335         /* Check the buffer size, to avoid warning */
 336         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 337                 return -EINVAL;
 338
 339         /* Copy kni info from user space */
 340         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 341         if (ret) {
 342                 pr_err("copy_from_user in kni_ioctl_create");
 343                 return -EIO;
 344         }
 345
 346         /* Check if name is zero-ended */
 347         if (strnlen(dev_info.name, sizeof(dev_info.name)) == sizeof(dev_info.name)) {
 348                 pr_err("kni.name not zero-terminated");
 349                 return -EINVAL;
 350         }
 351
 352         /**
 353          * Check if the cpu core id is valid for binding.
 354          */
 355         if (dev_info.force_bind && !cpu_online(dev_info.core_id)) {
 356                 pr_err("cpu %u is not online\n", dev_info.core_id);
 357                 return -EINVAL;
 358         }
 359
 360         /* Check if it has been created */
 361         down_read(&knet->kni_list_lock);
 362         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 363                 if (kni_check_param(dev, &dev_info) < 0) {
 364                         up_read(&knet->kni_list_lock);
 365                         return -EINVAL;
 366                 }
 367         }
 368         up_read(&knet->kni_list_lock);
 369
 370         net_dev = alloc_netdev(sizeof(struct kni_dev), dev_info.name,
 371 #ifdef NET_NAME_USER
 372                                                         NET_NAME_USER,
 373 #endif
 374                                                         kni_net_init);
 375         if (net_dev == NULL) {
 376                 pr_err("error allocating device \"%s\"\n", dev_info.name);
 377                 return -EBUSY;
 378         }
 379
 380         dev_net_set(net_dev, net);
 381
 382         kni = netdev_priv(net_dev);
 383
 384         kni->net_dev = net_dev;
 385         kni->group_id = dev_info.group_id;
 386         kni->core_id = dev_info.core_id;
 387         strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
 388
 389         /* Translate user space info into kernel space info */
 390         kni->tx_q = phys_to_virt(dev_info.tx_phys);
 391         kni->rx_q = phys_to_virt(dev_info.rx_phys);
 392         kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
 393         kni->free_q = phys_to_virt(dev_info.free_phys);
 394
 395         kni->req_q = phys_to_virt(dev_info.req_phys);
 396         kni->resp_q = phys_to_virt(dev_info.resp_phys);
 397         kni->sync_va = dev_info.sync_va;
 398         kni->sync_kva = phys_to_virt(dev_info.sync_phys);
 399
 400 #ifdef RTE_KNI_VHOST
 401         kni->vhost_queue = NULL;
 402         kni->vq_status = BE_STOP;
 403 #endif
 404         kni->mbuf_size = dev_info.mbuf_size;
 405
 406         pr_debug("tx_phys:      0x%016llx, tx_q addr:      0x%p\n",
 407                 (unsigned long long) dev_info.tx_phys, kni->tx_q);
 408         pr_debug("rx_phys:      0x%016llx, rx_q addr:      0x%p\n",
 409                 (unsigned long long) dev_info.rx_phys, kni->rx_q);
 410         pr_debug("alloc_phys:   0x%016llx, alloc_q addr:   0x%p\n",
 411                 (unsigned long long) dev_info.alloc_phys, kni->alloc_q);
 412         pr_debug("free_phys:    0x%016llx, free_q addr:    0x%p\n",
 413                 (unsigned long long) dev_info.free_phys, kni->free_q);
 414         pr_debug("req_phys:     0x%016llx, req_q addr:     0x%p\n",
 415                 (unsigned long long) dev_info.req_phys, kni->req_q);
 416         pr_debug("resp_phys:    0x%016llx, resp_q addr:    0x%p\n",
 417                 (unsigned long long) dev_info.resp_phys, kni->resp_q);
 418         pr_debug("mbuf_size:    %u\n", kni->mbuf_size);
 419
 420         pr_debug("PCI: %02x:%02x.%02x %04x:%04x\n",
 421                                         dev_info.bus,
 422                                         dev_info.devid,
 423                                         dev_info.function,
 424                                         dev_info.vendor_id,
 425                                         dev_info.device_id);
 426
 427 #ifdef CONFIG_RTE_KNI_KMOD_ETHTOOL
 428         struct pci_dev *found_pci = NULL;
 429         struct net_device *lad_dev = NULL;
 430         struct pci_dev *pci = NULL;
 431
 432         pci = pci_get_device(dev_info.vendor_id, dev_info.device_id, NULL);
 433
 434         /* Support Ethtool */
 435         while (pci) {
 436                 pr_debug("pci_bus: %02x:%02x:%02x\n",
 437                                         pci->bus->number,
 438                                         PCI_SLOT(pci->devfn),
 439                                         PCI_FUNC(pci->devfn));
 440
 441                 if ((pci->bus->number == dev_info.bus) &&
 442                         (PCI_SLOT(pci->devfn) == dev_info.devid) &&
 443                         (PCI_FUNC(pci->devfn) == dev_info.function)) {
 444                         found_pci = pci;
 445
 446                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 447                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 448                         else if (pci_match_id(igb_pci_tbl, found_pci))
 449                                 ret = igb_kni_probe(found_pci, &lad_dev);
 450                         else
 451                                 ret = -1;
 452
 453                         pr_debug("PCI found: pci=0x%p, lad_dev=0x%p\n",
 454                                                         pci, lad_dev);
 455                         if (ret == 0) {
 456                                 kni->lad_dev = lad_dev;
 457                                 kni_set_ethtool_ops(kni->net_dev);
 458                         } else {
 459                                 pr_err("Device not supported by ethtool");
 460                                 kni->lad_dev = NULL;
 461                         }
 462
 463                         kni->pci_dev = found_pci;
 464                         kni->device_id = dev_info.device_id;
 465                         break;
 466                 }
 467                 pci = pci_get_device(dev_info.vendor_id,
 468                                 dev_info.device_id, pci);
 469         }
 470         if (pci)
 471                 pci_dev_put(pci);
 472 #endif
 473
 474         if (kni->lad_dev)
 475                 ether_addr_copy(net_dev->dev_addr, kni->lad_dev->dev_addr);
 476         else
 477                 /*
 478                  * Generate random mac address. eth_random_addr() is the newer
 479                  * version of generating mac address in linux kernel.
 480                  */
 481                 random_ether_addr(net_dev->dev_addr);
 482
 483         ret = register_netdev(net_dev);
 484         if (ret) {
 485                 pr_err("error %i registering device \"%s\"\n",
 486                                         ret, dev_info.name);
 487                 kni->net_dev = NULL;
 488                 kni_dev_remove(kni);
 489                 free_netdev(net_dev);
 490                 return -ENODEV;
 491         }
 492
 493 #ifdef RTE_KNI_VHOST
 494         kni_vhost_init(kni);
 495 #endif
 496
 497         ret = kni_run_thread(knet, kni, dev_info.force_bind);
 498         if (ret != 0)
 499                 return ret;
 500
 501         down_write(&knet->kni_list_lock);
 502         list_add(&kni->list, &knet->kni_list_head);
 503         up_write(&knet->kni_list_lock);
 504
 505         return 0;
 506 }
 507
 508 static int
 509 kni_ioctl_release(struct net *net, uint32_t ioctl_num,
 510                 unsigned long ioctl_param)
 511 {
 512         struct kni_net *knet = net_generic(net, kni_net_id);
 513         int ret = -EINVAL;
 514         struct kni_dev *dev, *n;
 515         struct rte_kni_device_info dev_info;
 516
 517         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 518                 return -EINVAL;
 519
 520         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 521         if (ret) {
 522                 pr_err("copy_from_user in kni_ioctl_release");
 523                 return -EIO;
 524         }
 525
 526         /* Release the network device according to its name */
 527         if (strlen(dev_info.name) == 0)
 528                 return ret;
 529
 530         down_write(&knet->kni_list_lock);
 531         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 532                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 533                         continue;
 534
 535                 if (multiple_kthread_on && dev->pthread != NULL) {
 536                         kthread_stop(dev->pthread);
 537                         dev->pthread = NULL;
 538                 }
 539
 540 #ifdef RTE_KNI_VHOST
 541                 kni_vhost_backend_release(dev);
 542 #endif
 543                 kni_dev_remove(dev);
 544                 list_del(&dev->list);
 545                 ret = 0;
 546                 break;
 547         }
 548         up_write(&knet->kni_list_lock);
 549         pr_info("%s release kni named %s\n",
 550                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 551
 552         return ret;
 553 }
 554
 555 static int
 556 kni_ioctl(struct inode *inode, uint32_t ioctl_num, unsigned long ioctl_param)
 557 {
 558         int ret = -EINVAL;
 559         struct net *net = current->nsproxy->net_ns;
 560
 561         pr_debug("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 562
 563         /*
 564          * Switch according to the ioctl called
 565          */
 566         switch (_IOC_NR(ioctl_num)) {
 567         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 568                 /* For test only, not used */
 569                 break;
 570         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 571                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 572                 break;
 573         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 574                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 575                 break;
 576         default:
 577                 pr_debug("IOCTL default\n");
 578                 break;
 579         }
 580
 581         return ret;
 582 }
 583
 584 static int
 585 kni_compat_ioctl(struct inode *inode, uint32_t ioctl_num,
 586                 unsigned long ioctl_param)
 587 {
 588         /* 32 bits app on 64 bits OS to be supported later */
 589         pr_debug("Not implemented.\n");
 590
 591         return -EINVAL;
 592 }
 593
 594 static const struct file_operations kni_fops = {
 595         .owner = THIS_MODULE,
 596         .open = kni_open,
 597         .release = kni_release,
 598         .unlocked_ioctl = (void *)kni_ioctl,
 599         .compat_ioctl = (void *)kni_compat_ioctl,
 600 };
 601
 602 static struct miscdevice kni_misc = {
 603         .minor = MISC_DYNAMIC_MINOR,
 604         .name = KNI_DEVICE,
 605         .fops = &kni_fops,
 606 };
 607
 608 static int __init
 609 kni_parse_kthread_mode(void)
 610 {
 611         if (!kthread_mode)
 612                 return 0;
 613
 614         if (strcmp(kthread_mode, "single") == 0)
 615                 return 0;
 616         else if (strcmp(kthread_mode, "multiple") == 0)
 617                 multiple_kthread_on = 1;
 618         else
 619                 return -1;
 620
 621         return 0;
 622 }
 623
 624 static int __init
 625 kni_init(void)
 626 {
 627         int rc;
 628
 629         if (kni_parse_kthread_mode() < 0) {
 630                 pr_err("Invalid parameter for kthread_mode\n");
 631                 return -EINVAL;
 632         }
 633
 634         if (multiple_kthread_on == 0)
 635                 pr_debug("Single kernel thread for all KNI devices\n");
 636         else
 637                 pr_debug("Multiple kernel thread mode enabled\n");
 638
 639 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 640         rc = register_pernet_subsys(&kni_net_ops);
 641 #else
 642         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 643 #endif
 644         if (rc)
 645                 return -EPERM;
 646
 647         rc = misc_register(&kni_misc);
 648         if (rc != 0) {
 649                 pr_err("Misc registration failed\n");
 650                 goto out;
 651         }
 652
 653         /* Configure the lo mode according to the input parameter */
 654         kni_net_config_lo_mode(lo_mode);
 655
 656         return 0;
 657
 658 out:
 659 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 660         unregister_pernet_subsys(&kni_net_ops);
 661 #else
 662         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 663 #endif
 664         return rc;
 665 }
 666
 667 static void __exit
 668 kni_exit(void)
 669 {
 670         misc_deregister(&kni_misc);
 671 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 672         unregister_pernet_subsys(&kni_net_ops);
 673 #else
 674         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 675 #endif
 676 }
 677
 678 module_init(kni_init);
 679 module_exit(kni_exit);
 680
 681 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 682 MODULE_PARM_DESC(lo_mode,
 683 "KNI loopback mode (default=lo_mode_none):\n"
 684 "    lo_mode_none        Kernel loopback disabled\n"
 685 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 686 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 687 "\n"
 688 );
 689
 690 module_param(kthread_mode, charp, S_IRUGO);
 691 MODULE_PARM_DESC(kthread_mode,
 692 "Kernel thread mode (default=single):\n"
 693 "    single    Single kernel thread mode enabled.\n"
 694 "    multiple  Multiple kernel thread mode enabled.\n"
 695 "\n"
 696 );