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 static int kni_open(struct inode *inode, struct file *file);
  55 static int kni_release(struct inode *inode, struct file *file);
  56 static int kni_ioctl(struct inode *inode, unsigned int ioctl_num,
  57                                         unsigned long ioctl_param);
  58 static int kni_compat_ioctl(struct inode *inode, unsigned int ioctl_num,
  59                                                 unsigned long ioctl_param);
  60 static int kni_dev_remove(struct kni_dev *dev);
  61
  62 static int __init kni_parse_kthread_mode(void);
  63
  64 /* KNI processing for single kernel thread mode */
  65 static int kni_thread_single(void *unused);
  66 /* KNI processing for multiple kernel thread mode */
  67 static int kni_thread_multiple(void *param);
  68
  69 static const struct file_operations kni_fops = {
  70         .owner = THIS_MODULE,
  71         .open = kni_open,
  72         .release = kni_release,
  73         .unlocked_ioctl = (void *)kni_ioctl,
  74         .compat_ioctl = (void *)kni_compat_ioctl,
  75 };
  76
  77 static struct miscdevice kni_misc = {
  78         .minor = MISC_DYNAMIC_MINOR,
  79         .name = KNI_DEVICE,
  80         .fops = &kni_fops,
  81 };
  82
  83 /* loopback mode */
  84 static char *lo_mode;
  85
  86 /* Kernel thread mode */
  87 static char *kthread_mode;
  88 static unsigned int multiple_kthread_on;
  89
  90 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
  91
  92 static int kni_net_id;
  93
  94 struct kni_net {
  95         unsigned long device_in_use; /* device in use flag */
  96         struct mutex kni_kthread_lock;
  97         struct task_struct *kni_kthread;
  98         struct rw_semaphore kni_list_lock;
  99         struct list_head kni_list_head;
 100 };
 101
 102 static int __net_init
 103 kni_init_net(struct net *net)
 104 {
 105 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 106         struct kni_net *knet = net_generic(net, kni_net_id);
 107
 108         memset(knet, 0, sizeof(*knet));
 109 #else
 110         struct kni_net *knet;
 111         int ret;
 112
 113         knet = kzalloc(sizeof(struct kni_net), GFP_KERNEL);
 114         if (!knet) {
 115                 ret = -ENOMEM;
 116                 return ret;
 117         }
 118 #endif
 119
 120         /* Clear the bit of device in use */
 121         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 122
 123         mutex_init(&knet->kni_kthread_lock);
 124
 125         init_rwsem(&knet->kni_list_lock);
 126         INIT_LIST_HEAD(&knet->kni_list_head);
 127
 128 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 129         return 0;
 130 #else
 131         ret = net_assign_generic(net, kni_net_id, knet);
 132         if (ret < 0)
 133                 kfree(knet);
 134
 135         return ret;
 136 #endif
 137 }
 138
 139 static void __net_exit
 140 kni_exit_net(struct net *net)
 141 {
 142         struct kni_net *knet = net_generic(net, kni_net_id);
 143
 144         mutex_destroy(&knet->kni_kthread_lock);
 145 #ifndef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 146         kfree(knet);
 147 #endif
 148 }
 149
 150 static struct pernet_operations kni_net_ops = {
 151         .init = kni_init_net,
 152         .exit = kni_exit_net,
 153 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 154         .id   = &kni_net_id,
 155         .size = sizeof(struct kni_net),
 156 #endif
 157 };
 158
 159 static int __init
 160 kni_init(void)
 161 {
 162         int rc;
 163
 164         KNI_PRINT("######## DPDK kni module loading ########\n");
 165
 166         if (kni_parse_kthread_mode() < 0) {
 167                 KNI_ERR("Invalid parameter for kthread_mode\n");
 168                 return -EINVAL;
 169         }
 170
 171         if (multiple_kthread_on == 0)
 172                 KNI_PRINT("Single kernel thread for all KNI devices\n");
 173         else
 174                 KNI_PRINT("Multiple kernel thread mode enabled\n");
 175
 176 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 177         rc = register_pernet_subsys(&kni_net_ops);
 178 #else
 179         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 180 #endif
 181         if (rc)
 182                 return -EPERM;
 183
 184         rc = misc_register(&kni_misc);
 185         if (rc != 0) {
 186                 KNI_ERR("Misc registration failed\n");
 187                 goto out;
 188         }
 189
 190         /* Configure the lo mode according to the input parameter */
 191         kni_net_config_lo_mode(lo_mode);
 192
 193         KNI_PRINT("######## DPDK kni module loaded  ########\n");
 194
 195         return 0;
 196
 197 out:
 198 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 199         unregister_pernet_subsys(&kni_net_ops);
 200 #else
 201         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 202 #endif
 203         return rc;
 204 }
 205
 206 static void __exit
 207 kni_exit(void)
 208 {
 209         misc_deregister(&kni_misc);
 210 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 211         unregister_pernet_subsys(&kni_net_ops);
 212 #else
 213         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 214 #endif
 215         KNI_PRINT("####### DPDK kni module unloaded  #######\n");
 216 }
 217
 218 static int __init
 219 kni_parse_kthread_mode(void)
 220 {
 221         if (!kthread_mode)
 222                 return 0;
 223
 224         if (strcmp(kthread_mode, "single") == 0)
 225                 return 0;
 226         else if (strcmp(kthread_mode, "multiple") == 0)
 227                 multiple_kthread_on = 1;
 228         else
 229                 return -1;
 230
 231         return 0;
 232 }
 233
 234 static int
 235 kni_open(struct inode *inode, struct file *file)
 236 {
 237         struct net *net = current->nsproxy->net_ns;
 238         struct kni_net *knet = net_generic(net, kni_net_id);
 239
 240         /* kni device can be opened by one user only per netns */
 241         if (test_and_set_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use))
 242                 return -EBUSY;
 243
 244         file->private_data = get_net(net);
 245         KNI_PRINT("/dev/kni opened\n");
 246
 247         return 0;
 248 }
 249
 250 static int
 251 kni_release(struct inode *inode, struct file *file)
 252 {
 253         struct net *net = file->private_data;
 254         struct kni_net *knet = net_generic(net, kni_net_id);
 255         struct kni_dev *dev, *n;
 256
 257         /* Stop kernel thread for single mode */
 258         if (multiple_kthread_on == 0) {
 259                 mutex_lock(&knet->kni_kthread_lock);
 260                 /* Stop kernel thread */
 261                 if (knet->kni_kthread != NULL) {
 262                         kthread_stop(knet->kni_kthread);
 263                         knet->kni_kthread = NULL;
 264                 }
 265                 mutex_unlock(&knet->kni_kthread_lock);
 266         }
 267
 268         down_write(&knet->kni_list_lock);
 269         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 270                 /* Stop kernel thread for multiple mode */
 271                 if (multiple_kthread_on && dev->pthread != NULL) {
 272                         kthread_stop(dev->pthread);
 273                         dev->pthread = NULL;
 274                 }
 275
 276 #ifdef RTE_KNI_VHOST
 277                 kni_vhost_backend_release(dev);
 278 #endif
 279                 kni_dev_remove(dev);
 280                 list_del(&dev->list);
 281         }
 282         up_write(&knet->kni_list_lock);
 283
 284         /* Clear the bit of device in use */
 285         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 286
 287         put_net(net);
 288         KNI_PRINT("/dev/kni closed\n");
 289
 290         return 0;
 291 }
 292
 293 static int
 294 kni_thread_single(void *data)
 295 {
 296         struct kni_net *knet = data;
 297         int j;
 298         struct kni_dev *dev;
 299
 300         while (!kthread_should_stop()) {
 301                 down_read(&knet->kni_list_lock);
 302                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 303                         list_for_each_entry(dev, &knet->kni_list_head, list) {
 304 #ifdef RTE_KNI_VHOST
 305                                 kni_chk_vhost_rx(dev);
 306 #else
 307                                 kni_net_rx(dev);
 308 #endif
 309                                 kni_net_poll_resp(dev);
 310                         }
 311                 }
 312                 up_read(&knet->kni_list_lock);
 313 #ifdef RTE_KNI_PREEMPT_DEFAULT
 314                 /* reschedule out for a while */
 315                 schedule_timeout_interruptible(
 316                         usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
 317 #endif
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int
 324 kni_thread_multiple(void *param)
 325 {
 326         int j;
 327         struct kni_dev *dev = (struct kni_dev *)param;
 328
 329         while (!kthread_should_stop()) {
 330                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 331 #ifdef RTE_KNI_VHOST
 332                         kni_chk_vhost_rx(dev);
 333 #else
 334                         kni_net_rx(dev);
 335 #endif
 336                         kni_net_poll_resp(dev);
 337                 }
 338 #ifdef RTE_KNI_PREEMPT_DEFAULT
 339                 schedule_timeout_interruptible(
 340                         usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
 341 #endif
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int
 348 kni_dev_remove(struct kni_dev *dev)
 349 {
 350         if (!dev)
 351                 return -ENODEV;
 352
 353         if (dev->pci_dev) {
 354                 if (pci_match_id(ixgbe_pci_tbl, dev->pci_dev))
 355                         ixgbe_kni_remove(dev->pci_dev);
 356                 else if (pci_match_id(igb_pci_tbl, dev->pci_dev))
 357                         igb_kni_remove(dev->pci_dev);
 358         }
 359
 360         if (dev->net_dev) {
 361                 unregister_netdev(dev->net_dev);
 362                 free_netdev(dev->net_dev);
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int
 369 kni_check_param(struct kni_dev *kni, struct rte_kni_device_info *dev)
 370 {
 371         if (!kni || !dev)
 372                 return -1;
 373
 374         /* Check if network name has been used */
 375         if (!strncmp(kni->name, dev->name, RTE_KNI_NAMESIZE)) {
 376                 KNI_ERR("KNI name %s duplicated\n", dev->name);
 377                 return -1;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int
 384 kni_run_thread(struct kni_net *knet, struct kni_dev *kni, uint8_t force_bind)
 385 {
 386         /**
 387          * Create a new kernel thread for multiple mode, set its core affinity,
 388          * and finally wake it up.
 389          */
 390         if (multiple_kthread_on) {
 391                 kni->pthread = kthread_create(kni_thread_multiple,
 392                         (void *)kni, "kni_%s", kni->name);
 393                 if (IS_ERR(kni->pthread)) {
 394                         kni_dev_remove(kni);
 395                         return -ECANCELED;
 396                 }
 397
 398                 if (force_bind)
 399                         kthread_bind(kni->pthread, kni->core_id);
 400                 wake_up_process(kni->pthread);
 401         } else {
 402                 mutex_lock(&knet->kni_kthread_lock);
 403
 404                 if (knet->kni_kthread == NULL) {
 405                         knet->kni_kthread = kthread_create(kni_thread_single,
 406                                 (void *)knet, "kni_single");
 407                         if (IS_ERR(knet->kni_kthread)) {
 408                                 mutex_unlock(&knet->kni_kthread_lock);
 409                                 kni_dev_remove(kni);
 410                                 return -ECANCELED;
 411                         }
 412
 413                         if (force_bind)
 414                                 kthread_bind(knet->kni_kthread, kni->core_id);
 415                         wake_up_process(knet->kni_kthread);
 416                 }
 417
 418                 mutex_unlock(&knet->kni_kthread_lock);
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int
 425 kni_ioctl_create(struct net *net,
 426                 unsigned int ioctl_num, unsigned long ioctl_param)
 427 {
 428         struct kni_net *knet = net_generic(net, kni_net_id);
 429         int ret;
 430         struct rte_kni_device_info dev_info;
 431         struct pci_dev *pci = NULL;
 432         struct pci_dev *found_pci = NULL;
 433         struct net_device *net_dev = NULL;
 434         struct net_device *lad_dev = NULL;
 435         struct kni_dev *kni, *dev, *n;
 436
 437         printk(KERN_INFO "KNI: Creating kni...\n");
 438         /* Check the buffer size, to avoid warning */
 439         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 440                 return -EINVAL;
 441
 442         /* Copy kni info from user space */
 443         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 444         if (ret) {
 445                 KNI_ERR("copy_from_user in kni_ioctl_create");
 446                 return -EIO;
 447         }
 448
 449         /**
 450          * Check if the cpu core id is valid for binding.
 451          */
 452         if (dev_info.force_bind && !cpu_online(dev_info.core_id)) {
 453                 KNI_ERR("cpu %u is not online\n", dev_info.core_id);
 454                 return -EINVAL;
 455         }
 456
 457         /* Check if it has been created */
 458         down_read(&knet->kni_list_lock);
 459         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 460                 if (kni_check_param(dev, &dev_info) < 0) {
 461                         up_read(&knet->kni_list_lock);
 462                         return -EINVAL;
 463                 }
 464         }
 465         up_read(&knet->kni_list_lock);
 466
 467         net_dev = alloc_netdev(sizeof(struct kni_dev), dev_info.name,
 468 #ifdef NET_NAME_UNKNOWN
 469                                                         NET_NAME_UNKNOWN,
 470 #endif
 471                                                         kni_net_init);
 472         if (net_dev == NULL) {
 473                 KNI_ERR("error allocating device \"%s\"\n", dev_info.name);
 474                 return -EBUSY;
 475         }
 476
 477         dev_net_set(net_dev, net);
 478
 479         kni = netdev_priv(net_dev);
 480
 481         kni->net_dev = net_dev;
 482         kni->group_id = dev_info.group_id;
 483         kni->core_id = dev_info.core_id;
 484         strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
 485
 486         /* Translate user space info into kernel space info */
 487         kni->tx_q = phys_to_virt(dev_info.tx_phys);
 488         kni->rx_q = phys_to_virt(dev_info.rx_phys);
 489         kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
 490         kni->free_q = phys_to_virt(dev_info.free_phys);
 491
 492         kni->req_q = phys_to_virt(dev_info.req_phys);
 493         kni->resp_q = phys_to_virt(dev_info.resp_phys);
 494         kni->sync_va = dev_info.sync_va;
 495         kni->sync_kva = phys_to_virt(dev_info.sync_phys);
 496
 497 #ifdef RTE_KNI_VHOST
 498         kni->vhost_queue = NULL;
 499         kni->vq_status = BE_STOP;
 500 #endif
 501         kni->mbuf_size = dev_info.mbuf_size;
 502
 503         KNI_PRINT("tx_phys:      0x%016llx, tx_q addr:      0x%p\n",
 504                 (unsigned long long) dev_info.tx_phys, kni->tx_q);
 505         KNI_PRINT("rx_phys:      0x%016llx, rx_q addr:      0x%p\n",
 506                 (unsigned long long) dev_info.rx_phys, kni->rx_q);
 507         KNI_PRINT("alloc_phys:   0x%016llx, alloc_q addr:   0x%p\n",
 508                 (unsigned long long) dev_info.alloc_phys, kni->alloc_q);
 509         KNI_PRINT("free_phys:    0x%016llx, free_q addr:    0x%p\n",
 510                 (unsigned long long) dev_info.free_phys, kni->free_q);
 511         KNI_PRINT("req_phys:     0x%016llx, req_q addr:     0x%p\n",
 512                 (unsigned long long) dev_info.req_phys, kni->req_q);
 513         KNI_PRINT("resp_phys:    0x%016llx, resp_q addr:    0x%p\n",
 514                 (unsigned long long) dev_info.resp_phys, kni->resp_q);
 515         KNI_PRINT("mbuf_size:    %u\n", kni->mbuf_size);
 516
 517         KNI_DBG("PCI: %02x:%02x.%02x %04x:%04x\n",
 518                                         dev_info.bus,
 519                                         dev_info.devid,
 520                                         dev_info.function,
 521                                         dev_info.vendor_id,
 522                                         dev_info.device_id);
 523
 524         pci = pci_get_device(dev_info.vendor_id, dev_info.device_id, NULL);
 525
 526         /* Support Ethtool */
 527         while (pci) {
 528                 KNI_PRINT("pci_bus: %02x:%02x:%02x\n",
 529                                         pci->bus->number,
 530                                         PCI_SLOT(pci->devfn),
 531                                         PCI_FUNC(pci->devfn));
 532
 533                 if ((pci->bus->number == dev_info.bus) &&
 534                         (PCI_SLOT(pci->devfn) == dev_info.devid) &&
 535                         (PCI_FUNC(pci->devfn) == dev_info.function)) {
 536                         found_pci = pci;
 537
 538                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 539                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 540                         else if (pci_match_id(igb_pci_tbl, found_pci))
 541                                 ret = igb_kni_probe(found_pci, &lad_dev);
 542                         else
 543                                 ret = -1;
 544
 545                         KNI_DBG("PCI found: pci=0x%p, lad_dev=0x%p\n",
 546                                                         pci, lad_dev);
 547                         if (ret == 0) {
 548                                 kni->lad_dev = lad_dev;
 549                                 kni_set_ethtool_ops(kni->net_dev);
 550                         } else {
 551                                 KNI_ERR("Device not supported by ethtool");
 552                                 kni->lad_dev = NULL;
 553                         }
 554
 555                         kni->pci_dev = found_pci;
 556                         kni->device_id = dev_info.device_id;
 557                         break;
 558                 }
 559                 pci = pci_get_device(dev_info.vendor_id,
 560                                 dev_info.device_id, pci);
 561         }
 562         if (pci)
 563                 pci_dev_put(pci);
 564
 565         if (kni->lad_dev)
 566                 memcpy(net_dev->dev_addr, kni->lad_dev->dev_addr, ETH_ALEN);
 567         else
 568                 /*
 569                  * Generate random mac address. eth_random_addr() is the newer
 570                  * version of generating mac address in linux kernel.
 571                  */
 572                 random_ether_addr(net_dev->dev_addr);
 573
 574         ret = register_netdev(net_dev);
 575         if (ret) {
 576                 KNI_ERR("error %i registering device \"%s\"\n",
 577                                         ret, dev_info.name);
 578                 kni->net_dev = NULL;
 579                 kni_dev_remove(kni);
 580                 free_netdev(net_dev);
 581                 return -ENODEV;
 582         }
 583
 584 #ifdef RTE_KNI_VHOST
 585         kni_vhost_init(kni);
 586 #endif
 587
 588         ret = kni_run_thread(knet, kni, dev_info.force_bind);
 589         if (ret != 0)
 590                 return ret;
 591
 592         down_write(&knet->kni_list_lock);
 593         list_add(&kni->list, &knet->kni_list_head);
 594         up_write(&knet->kni_list_lock);
 595
 596         return 0;
 597 }
 598
 599 static int
 600 kni_ioctl_release(struct net *net,
 601                 unsigned int ioctl_num, unsigned long ioctl_param)
 602 {
 603         struct kni_net *knet = net_generic(net, kni_net_id);
 604         int ret = -EINVAL;
 605         struct kni_dev *dev, *n;
 606         struct rte_kni_device_info dev_info;
 607
 608         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 609                 return -EINVAL;
 610
 611         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 612         if (ret) {
 613                 KNI_ERR("copy_from_user in kni_ioctl_release");
 614                 return -EIO;
 615         }
 616
 617         /* Release the network device according to its name */
 618         if (strlen(dev_info.name) == 0)
 619                 return ret;
 620
 621         down_write(&knet->kni_list_lock);
 622         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 623                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 624                         continue;
 625
 626                 if (multiple_kthread_on && dev->pthread != NULL) {
 627                         kthread_stop(dev->pthread);
 628                         dev->pthread = NULL;
 629                 }
 630
 631 #ifdef RTE_KNI_VHOST
 632                 kni_vhost_backend_release(dev);
 633 #endif
 634                 kni_dev_remove(dev);
 635                 list_del(&dev->list);
 636                 ret = 0;
 637                 break;
 638         }
 639         up_write(&knet->kni_list_lock);
 640         printk(KERN_INFO "KNI: %s release kni named %s\n",
 641                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 642
 643         return ret;
 644 }
 645
 646 static int
 647 kni_ioctl(struct inode *inode,
 648         unsigned int ioctl_num,
 649         unsigned long ioctl_param)
 650 {
 651         int ret = -EINVAL;
 652         struct net *net = current->nsproxy->net_ns;
 653
 654         KNI_DBG("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 655
 656         /*
 657          * Switch according to the ioctl called
 658          */
 659         switch (_IOC_NR(ioctl_num)) {
 660         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 661                 /* For test only, not used */
 662                 break;
 663         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 664                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 665                 break;
 666         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 667                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 668                 break;
 669         default:
 670                 KNI_DBG("IOCTL default\n");
 671                 break;
 672         }
 673
 674         return ret;
 675 }
 676
 677 static int
 678 kni_compat_ioctl(struct inode *inode,
 679                 unsigned int ioctl_num,
 680                 unsigned long ioctl_param)
 681 {
 682         /* 32 bits app on 64 bits OS to be supported later */
 683         KNI_PRINT("Not implemented.\n");
 684
 685         return -EINVAL;
 686 }
 687
 688 module_init(kni_init);
 689 module_exit(kni_exit);
 690
 691 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 692 MODULE_PARM_DESC(lo_mode,
 693 "KNI loopback mode (default=lo_mode_none):\n"
 694 "    lo_mode_none        Kernel loopback disabled\n"
 695 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 696 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 697 "\n"
 698 );
 699
 700 module_param(kthread_mode, charp, S_IRUGO);
 701 MODULE_PARM_DESC(kthread_mode,
 702 "Kernel thread mode (default=single):\n"
 703 "    single    Single kernel thread mode enabled.\n"
 704 "    multiple  Multiple kernel thread mode enabled.\n"
 705 "\n"
 706 );