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         /**
 347          * Check if the cpu core id is valid for binding.
 348          */
 349         if (dev_info.force_bind && !cpu_online(dev_info.core_id)) {
 350                 pr_err("cpu %u is not online\n", dev_info.core_id);
 351                 return -EINVAL;
 352         }
 353
 354         /* Check if it has been created */
 355         down_read(&knet->kni_list_lock);
 356         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 357                 if (kni_check_param(dev, &dev_info) < 0) {
 358                         up_read(&knet->kni_list_lock);
 359                         return -EINVAL;
 360                 }
 361         }
 362         up_read(&knet->kni_list_lock);
 363
 364         net_dev = alloc_netdev(sizeof(struct kni_dev), dev_info.name,
 365 #ifdef NET_NAME_UNKNOWN
 366                                                         NET_NAME_UNKNOWN,
 367 #endif
 368                                                         kni_net_init);
 369         if (net_dev == NULL) {
 370                 pr_err("error allocating device \"%s\"\n", dev_info.name);
 371                 return -EBUSY;
 372         }
 373
 374         dev_net_set(net_dev, net);
 375
 376         kni = netdev_priv(net_dev);
 377
 378         kni->net_dev = net_dev;
 379         kni->group_id = dev_info.group_id;
 380         kni->core_id = dev_info.core_id;
 381         strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
 382
 383         /* Translate user space info into kernel space info */
 384         kni->tx_q = phys_to_virt(dev_info.tx_phys);
 385         kni->rx_q = phys_to_virt(dev_info.rx_phys);
 386         kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
 387         kni->free_q = phys_to_virt(dev_info.free_phys);
 388
 389         kni->req_q = phys_to_virt(dev_info.req_phys);
 390         kni->resp_q = phys_to_virt(dev_info.resp_phys);
 391         kni->sync_va = dev_info.sync_va;
 392         kni->sync_kva = phys_to_virt(dev_info.sync_phys);
 393
 394 #ifdef RTE_KNI_VHOST
 395         kni->vhost_queue = NULL;
 396         kni->vq_status = BE_STOP;
 397 #endif
 398         kni->mbuf_size = dev_info.mbuf_size;
 399
 400         pr_debug("tx_phys:      0x%016llx, tx_q addr:      0x%p\n",
 401                 (unsigned long long) dev_info.tx_phys, kni->tx_q);
 402         pr_debug("rx_phys:      0x%016llx, rx_q addr:      0x%p\n",
 403                 (unsigned long long) dev_info.rx_phys, kni->rx_q);
 404         pr_debug("alloc_phys:   0x%016llx, alloc_q addr:   0x%p\n",
 405                 (unsigned long long) dev_info.alloc_phys, kni->alloc_q);
 406         pr_debug("free_phys:    0x%016llx, free_q addr:    0x%p\n",
 407                 (unsigned long long) dev_info.free_phys, kni->free_q);
 408         pr_debug("req_phys:     0x%016llx, req_q addr:     0x%p\n",
 409                 (unsigned long long) dev_info.req_phys, kni->req_q);
 410         pr_debug("resp_phys:    0x%016llx, resp_q addr:    0x%p\n",
 411                 (unsigned long long) dev_info.resp_phys, kni->resp_q);
 412         pr_debug("mbuf_size:    %u\n", kni->mbuf_size);
 413
 414         pr_debug("PCI: %02x:%02x.%02x %04x:%04x\n",
 415                                         dev_info.bus,
 416                                         dev_info.devid,
 417                                         dev_info.function,
 418                                         dev_info.vendor_id,
 419                                         dev_info.device_id);
 420
 421 #ifdef CONFIG_RTE_KNI_KMOD_ETHTOOL
 422         struct pci_dev *found_pci = NULL;
 423         struct net_device *lad_dev = NULL;
 424         struct pci_dev *pci = NULL;
 425
 426         pci = pci_get_device(dev_info.vendor_id, dev_info.device_id, NULL);
 427
 428         /* Support Ethtool */
 429         while (pci) {
 430                 pr_debug("pci_bus: %02x:%02x:%02x\n",
 431                                         pci->bus->number,
 432                                         PCI_SLOT(pci->devfn),
 433                                         PCI_FUNC(pci->devfn));
 434
 435                 if ((pci->bus->number == dev_info.bus) &&
 436                         (PCI_SLOT(pci->devfn) == dev_info.devid) &&
 437                         (PCI_FUNC(pci->devfn) == dev_info.function)) {
 438                         found_pci = pci;
 439
 440                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 441                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 442                         else if (pci_match_id(igb_pci_tbl, found_pci))
 443                                 ret = igb_kni_probe(found_pci, &lad_dev);
 444                         else
 445                                 ret = -1;
 446
 447                         pr_debug("PCI found: pci=0x%p, lad_dev=0x%p\n",
 448                                                         pci, lad_dev);
 449                         if (ret == 0) {
 450                                 kni->lad_dev = lad_dev;
 451                                 kni_set_ethtool_ops(kni->net_dev);
 452                         } else {
 453                                 pr_err("Device not supported by ethtool");
 454                                 kni->lad_dev = NULL;
 455                         }
 456
 457                         kni->pci_dev = found_pci;
 458                         kni->device_id = dev_info.device_id;
 459                         break;
 460                 }
 461                 pci = pci_get_device(dev_info.vendor_id,
 462                                 dev_info.device_id, pci);
 463         }
 464         if (pci)
 465                 pci_dev_put(pci);
 466 #endif
 467
 468         if (kni->lad_dev)
 469                 ether_addr_copy(net_dev->dev_addr, kni->lad_dev->dev_addr);
 470         else
 471                 /*
 472                  * Generate random mac address. eth_random_addr() is the newer
 473                  * version of generating mac address in linux kernel.
 474                  */
 475                 random_ether_addr(net_dev->dev_addr);
 476
 477         ret = register_netdev(net_dev);
 478         if (ret) {
 479                 pr_err("error %i registering device \"%s\"\n",
 480                                         ret, dev_info.name);
 481                 kni->net_dev = NULL;
 482                 kni_dev_remove(kni);
 483                 free_netdev(net_dev);
 484                 return -ENODEV;
 485         }
 486
 487 #ifdef RTE_KNI_VHOST
 488         kni_vhost_init(kni);
 489 #endif
 490
 491         ret = kni_run_thread(knet, kni, dev_info.force_bind);
 492         if (ret != 0)
 493                 return ret;
 494
 495         down_write(&knet->kni_list_lock);
 496         list_add(&kni->list, &knet->kni_list_head);
 497         up_write(&knet->kni_list_lock);
 498
 499         return 0;
 500 }
 501
 502 static int
 503 kni_ioctl_release(struct net *net, uint32_t ioctl_num,
 504                 unsigned long ioctl_param)
 505 {
 506         struct kni_net *knet = net_generic(net, kni_net_id);
 507         int ret = -EINVAL;
 508         struct kni_dev *dev, *n;
 509         struct rte_kni_device_info dev_info;
 510
 511         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 512                 return -EINVAL;
 513
 514         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 515         if (ret) {
 516                 pr_err("copy_from_user in kni_ioctl_release");
 517                 return -EIO;
 518         }
 519
 520         /* Release the network device according to its name */
 521         if (strlen(dev_info.name) == 0)
 522                 return ret;
 523
 524         down_write(&knet->kni_list_lock);
 525         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 526                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 527                         continue;
 528
 529                 if (multiple_kthread_on && dev->pthread != NULL) {
 530                         kthread_stop(dev->pthread);
 531                         dev->pthread = NULL;
 532                 }
 533
 534 #ifdef RTE_KNI_VHOST
 535                 kni_vhost_backend_release(dev);
 536 #endif
 537                 kni_dev_remove(dev);
 538                 list_del(&dev->list);
 539                 ret = 0;
 540                 break;
 541         }
 542         up_write(&knet->kni_list_lock);
 543         pr_info("%s release kni named %s\n",
 544                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 545
 546         return ret;
 547 }
 548
 549 static int
 550 kni_ioctl(struct inode *inode, uint32_t ioctl_num, unsigned long ioctl_param)
 551 {
 552         int ret = -EINVAL;
 553         struct net *net = current->nsproxy->net_ns;
 554
 555         pr_debug("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 556
 557         /*
 558          * Switch according to the ioctl called
 559          */
 560         switch (_IOC_NR(ioctl_num)) {
 561         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 562                 /* For test only, not used */
 563                 break;
 564         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 565                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 566                 break;
 567         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 568                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 569                 break;
 570         default:
 571                 pr_debug("IOCTL default\n");
 572                 break;
 573         }
 574
 575         return ret;
 576 }
 577
 578 static int
 579 kni_compat_ioctl(struct inode *inode, uint32_t ioctl_num,
 580                 unsigned long ioctl_param)
 581 {
 582         /* 32 bits app on 64 bits OS to be supported later */
 583         pr_debug("Not implemented.\n");
 584
 585         return -EINVAL;
 586 }
 587
 588 static const struct file_operations kni_fops = {
 589         .owner = THIS_MODULE,
 590         .open = kni_open,
 591         .release = kni_release,
 592         .unlocked_ioctl = (void *)kni_ioctl,
 593         .compat_ioctl = (void *)kni_compat_ioctl,
 594 };
 595
 596 static struct miscdevice kni_misc = {
 597         .minor = MISC_DYNAMIC_MINOR,
 598         .name = KNI_DEVICE,
 599         .fops = &kni_fops,
 600 };
 601
 602 static int __init
 603 kni_parse_kthread_mode(void)
 604 {
 605         if (!kthread_mode)
 606                 return 0;
 607
 608         if (strcmp(kthread_mode, "single") == 0)
 609                 return 0;
 610         else if (strcmp(kthread_mode, "multiple") == 0)
 611                 multiple_kthread_on = 1;
 612         else
 613                 return -1;
 614
 615         return 0;
 616 }
 617
 618 static int __init
 619 kni_init(void)
 620 {
 621         int rc;
 622
 623         if (kni_parse_kthread_mode() < 0) {
 624                 pr_err("Invalid parameter for kthread_mode\n");
 625                 return -EINVAL;
 626         }
 627
 628         if (multiple_kthread_on == 0)
 629                 pr_debug("Single kernel thread for all KNI devices\n");
 630         else
 631                 pr_debug("Multiple kernel thread mode enabled\n");
 632
 633 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 634         rc = register_pernet_subsys(&kni_net_ops);
 635 #else
 636         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 637 #endif
 638         if (rc)
 639                 return -EPERM;
 640
 641         rc = misc_register(&kni_misc);
 642         if (rc != 0) {
 643                 pr_err("Misc registration failed\n");
 644                 goto out;
 645         }
 646
 647         /* Configure the lo mode according to the input parameter */
 648         kni_net_config_lo_mode(lo_mode);
 649
 650         return 0;
 651
 652 out:
 653 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 654         unregister_pernet_subsys(&kni_net_ops);
 655 #else
 656         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 657 #endif
 658         return rc;
 659 }
 660
 661 static void __exit
 662 kni_exit(void)
 663 {
 664         misc_deregister(&kni_misc);
 665 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 666         unregister_pernet_subsys(&kni_net_ops);
 667 #else
 668         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 669 #endif
 670 }
 671
 672 module_init(kni_init);
 673 module_exit(kni_exit);
 674
 675 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 676 MODULE_PARM_DESC(lo_mode,
 677 "KNI loopback mode (default=lo_mode_none):\n"
 678 "    lo_mode_none        Kernel loopback disabled\n"
 679 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 680 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 681 "\n"
 682 );
 683
 684 module_param(kthread_mode, charp, S_IRUGO);
 685 MODULE_PARM_DESC(kthread_mode,
 686 "Kernel thread mode (default=single):\n"
 687 "    single    Single kernel thread mode enabled.\n"
 688 "    multiple  Multiple kernel thread mode enabled.\n"
 689 "\n"
 690 );