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/nsproxy.h>
  34 #include <net/net_namespace.h>
  35 #include <net/netns/generic.h>
  36
  37 #include <exec-env/rte_kni_common.h>
  38
  39 #include "compat.h"
  40 #include "kni_dev.h"
  41
  42 MODULE_LICENSE("Dual BSD/GPL");
  43 MODULE_AUTHOR("Intel Corporation");
  44 MODULE_DESCRIPTION("Kernel Module for managing kni devices");
  45
  46 #define KNI_RX_LOOP_NUM 1000
  47
  48 #define KNI_MAX_DEVICES 32
  49
  50 extern void kni_net_rx(struct kni_dev *kni);
  51 extern void kni_net_init(struct net_device *dev);
  52 extern void kni_net_config_lo_mode(char *lo_str);
  53 extern void kni_net_poll_resp(struct kni_dev *kni);
  54 extern void kni_set_ethtool_ops(struct net_device *netdev);
  55
  56 extern int ixgbe_kni_probe(struct pci_dev *pdev, struct net_device **lad_dev);
  57 extern void ixgbe_kni_remove(struct pci_dev *pdev);
  58 extern struct pci_device_id ixgbe_pci_tbl[];
  59 extern int igb_kni_probe(struct pci_dev *pdev, struct net_device **lad_dev);
  60 extern void igb_kni_remove(struct pci_dev *pdev);
  61 extern struct pci_device_id igb_pci_tbl[];
  62
  63 static int kni_open(struct inode *inode, struct file *file);
  64 static int kni_release(struct inode *inode, struct file *file);
  65 static int kni_ioctl(struct inode *inode, unsigned int ioctl_num,
  66                                         unsigned long ioctl_param);
  67 static int kni_compat_ioctl(struct inode *inode, unsigned int ioctl_num,
  68                                                 unsigned long ioctl_param);
  69 static int kni_dev_remove(struct kni_dev *dev);
  70
  71 static int __init kni_parse_kthread_mode(void);
  72
  73 /* KNI processing for single kernel thread mode */
  74 static int kni_thread_single(void *unused);
  75 /* KNI processing for multiple kernel thread mode */
  76 static int kni_thread_multiple(void *param);
  77
  78 static struct file_operations kni_fops = {
  79         .owner = THIS_MODULE,
  80         .open = kni_open,
  81         .release = kni_release,
  82         .unlocked_ioctl = (void *)kni_ioctl,
  83         .compat_ioctl = (void *)kni_compat_ioctl,
  84 };
  85
  86 static struct miscdevice kni_misc = {
  87         .minor = MISC_DYNAMIC_MINOR,
  88         .name = KNI_DEVICE,
  89         .fops = &kni_fops,
  90 };
  91
  92 /* loopback mode */
  93 static char *lo_mode = NULL;
  94
  95 /* Kernel thread mode */
  96 static char *kthread_mode = NULL;
  97 static unsigned multiple_kthread_on = 0;
  98
  99 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
 100
 101 static int kni_net_id;
 102
 103 struct kni_net {
 104         unsigned long device_in_use; /* device in use flag */
 105         struct task_struct *kni_kthread;
 106         struct rw_semaphore kni_list_lock;
 107         struct list_head kni_list_head;
 108 };
 109
 110 static int __net_init kni_init_net(struct net *net)
 111 {
 112 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 113         struct kni_net *knet = net_generic(net, kni_net_id);
 114 #else
 115         struct kni_net *knet;
 116         int ret;
 117
 118         knet = kmalloc(sizeof(struct kni_net), GFP_KERNEL);
 119         if (!knet) {
 120                 ret = -ENOMEM;
 121                 return ret;
 122         }
 123 #endif
 124
 125         /* Clear the bit of device in use */
 126         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 127
 128         init_rwsem(&knet->kni_list_lock);
 129         INIT_LIST_HEAD(&knet->kni_list_head);
 130
 131 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 132         return 0;
 133 #else
 134         ret = net_assign_generic(net, kni_net_id, knet);
 135         if (ret < 0)
 136                 kfree(knet);
 137
 138         return ret;
 139 #endif
 140 }
 141
 142 static void __net_exit kni_exit_net(struct net *net)
 143 {
 144 #ifndef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 145         struct kni_net *knet = net_generic(net, kni_net_id);
 146
 147         kfree(knet);
 148 #endif
 149 }
 150
 151 static struct pernet_operations kni_net_ops = {
 152         .init = kni_init_net,
 153         .exit = kni_exit_net,
 154 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 155         .id   = &kni_net_id,
 156         .size = sizeof(struct kni_net),
 157 #endif
 158 };
 159
 160 static int __init
 161 kni_init(void)
 162 {
 163         int rc;
 164
 165         KNI_PRINT("######## DPDK kni module loading ########\n");
 166
 167         if (kni_parse_kthread_mode() < 0) {
 168                 KNI_ERR("Invalid parameter for kthread_mode\n");
 169                 return -EINVAL;
 170         }
 171
 172 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 173         rc = register_pernet_subsys(&kni_net_ops);
 174 #else
 175         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 176 #endif
 177         if (rc)
 178                 return -EPERM;
 179
 180         rc = misc_register(&kni_misc);
 181         if (rc != 0) {
 182                 KNI_ERR("Misc registration failed\n");
 183                 goto out;
 184         }
 185
 186         /* Configure the lo mode according to the input parameter */
 187         kni_net_config_lo_mode(lo_mode);
 188
 189         KNI_PRINT("######## DPDK kni module loaded  ########\n");
 190
 191         return 0;
 192
 193 out:
 194 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 195         unregister_pernet_subsys(&kni_net_ops);
 196 #else
 197         register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 198 #endif
 199         return rc;
 200 }
 201
 202 static void __exit
 203 kni_exit(void)
 204 {
 205         misc_deregister(&kni_misc);
 206 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 207         unregister_pernet_subsys(&kni_net_ops);
 208 #else
 209         register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 210 #endif
 211         KNI_PRINT("####### DPDK kni module unloaded  #######\n");
 212 }
 213
 214 static int __init
 215 kni_parse_kthread_mode(void)
 216 {
 217         if (!kthread_mode)
 218                 return 0;
 219
 220         if (strcmp(kthread_mode, "single") == 0)
 221                 return 0;
 222         else if (strcmp(kthread_mode, "multiple") == 0)
 223                 multiple_kthread_on = 1;
 224         else
 225                 return -1;
 226
 227         return 0;
 228 }
 229
 230 static int
 231 kni_open(struct inode *inode, struct file *file)
 232 {
 233         struct net *net = current->nsproxy->net_ns;
 234         struct kni_net *knet = net_generic(net, kni_net_id);
 235
 236         /* kni device can be opened by one user only per netns */
 237         if (test_and_set_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use))
 238                 return -EBUSY;
 239
 240         /* Create kernel thread for single mode */
 241         if (multiple_kthread_on == 0) {
 242                 KNI_PRINT("Single kernel thread for all KNI devices\n");
 243                 /* Create kernel thread for RX */
 244                 knet->kni_kthread = kthread_run(kni_thread_single, (void *)knet,
 245                                                 "kni_single");
 246                 if (IS_ERR(knet->kni_kthread)) {
 247                         KNI_ERR("Unable to create kernel threaed\n");
 248                         return PTR_ERR(knet->kni_kthread);
 249                 }
 250         } else
 251                 KNI_PRINT("Multiple kernel thread mode enabled\n");
 252
 253         file->private_data = get_net(net);
 254         KNI_PRINT("/dev/kni opened\n");
 255
 256         return 0;
 257 }
 258
 259 static int
 260 kni_release(struct inode *inode, struct file *file)
 261 {
 262         struct net *net = file->private_data;
 263         struct kni_net *knet = net_generic(net, kni_net_id);
 264         struct kni_dev *dev, *n;
 265
 266         /* Stop kernel thread for single mode */
 267         if (multiple_kthread_on == 0) {
 268                 /* Stop kernel thread */
 269                 kthread_stop(knet->kni_kthread);
 270                 knet->kni_kthread = NULL;
 271         }
 272
 273         down_write(&knet->kni_list_lock);
 274         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 275                 /* Stop kernel thread for multiple mode */
 276                 if (multiple_kthread_on && dev->pthread != NULL) {
 277                         kthread_stop(dev->pthread);
 278                         dev->pthread = NULL;
 279                 }
 280
 281 #ifdef RTE_KNI_VHOST
 282                 kni_vhost_backend_release(dev);
 283 #endif
 284                 kni_dev_remove(dev);
 285                 list_del(&dev->list);
 286         }
 287         up_write(&knet->kni_list_lock);
 288
 289         /* Clear the bit of device in use */
 290         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 291
 292         put_net(net);
 293         KNI_PRINT("/dev/kni closed\n");
 294
 295         return 0;
 296 }
 297
 298 static int
 299 kni_thread_single(void *data)
 300 {
 301         struct kni_net *knet = data;
 302         int j;
 303         struct kni_dev *dev;
 304
 305         while (!kthread_should_stop()) {
 306                 down_read(&knet->kni_list_lock);
 307                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 308                         list_for_each_entry(dev, &knet->kni_list_head, list) {
 309 #ifdef RTE_KNI_VHOST
 310                                 kni_chk_vhost_rx(dev);
 311 #else
 312                                 kni_net_rx(dev);
 313 #endif
 314                                 kni_net_poll_resp(dev);
 315                         }
 316                 }
 317                 up_read(&knet->kni_list_lock);
 318 #ifdef RTE_KNI_PREEMPT_DEFAULT
 319                 /* reschedule out for a while */
 320                 schedule_timeout_interruptible(usecs_to_jiffies( \
 321                                 KNI_KTHREAD_RESCHEDULE_INTERVAL));
 322 #endif
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int
 329 kni_thread_multiple(void *param)
 330 {
 331         int j;
 332         struct kni_dev *dev = (struct kni_dev *)param;
 333
 334         while (!kthread_should_stop()) {
 335                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 336 #ifdef RTE_KNI_VHOST
 337                         kni_chk_vhost_rx(dev);
 338 #else
 339                         kni_net_rx(dev);
 340 #endif
 341                         kni_net_poll_resp(dev);
 342                 }
 343 #ifdef RTE_KNI_PREEMPT_DEFAULT
 344                 schedule_timeout_interruptible(usecs_to_jiffies( \
 345                                 KNI_KTHREAD_RESCHEDULE_INTERVAL));
 346 #endif
 347         }
 348
 349         return 0;
 350 }
 351
 352 static int
 353 kni_dev_remove(struct kni_dev *dev)
 354 {
 355         if (!dev)
 356                 return -ENODEV;
 357
 358         if (dev->pci_dev) {
 359                 if (pci_match_id(ixgbe_pci_tbl, dev->pci_dev))
 360                         ixgbe_kni_remove(dev->pci_dev);
 361                 else if (pci_match_id(igb_pci_tbl, dev->pci_dev))
 362                         igb_kni_remove(dev->pci_dev);
 363         }
 364
 365         if (dev->net_dev) {
 366                 unregister_netdev(dev->net_dev);
 367                 free_netdev(dev->net_dev);
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int
 374 kni_check_param(struct kni_dev *kni, struct rte_kni_device_info *dev)
 375 {
 376         if (!kni || !dev)
 377                 return -1;
 378
 379         /* Check if network name has been used */
 380         if (!strncmp(kni->name, dev->name, RTE_KNI_NAMESIZE)) {
 381                 KNI_ERR("KNI name %s duplicated\n", dev->name);
 382                 return -1;
 383         }
 384
 385         return 0;
 386 }
 387
 388 static int
 389 kni_ioctl_create(struct net *net,
 390                 unsigned int ioctl_num, unsigned long ioctl_param)
 391 {
 392         struct kni_net *knet = net_generic(net, kni_net_id);
 393         int ret;
 394         struct rte_kni_device_info dev_info;
 395         struct pci_dev *pci = NULL;
 396         struct pci_dev *found_pci = NULL;
 397         struct net_device *net_dev = NULL;
 398         struct net_device *lad_dev = NULL;
 399         struct kni_dev *kni, *dev, *n;
 400
 401         printk(KERN_INFO "KNI: Creating kni...\n");
 402         /* Check the buffer size, to avoid warning */
 403         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 404                 return -EINVAL;
 405
 406         /* Copy kni info from user space */
 407         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 408         if (ret) {
 409                 KNI_ERR("copy_from_user in kni_ioctl_create");
 410                 return -EIO;
 411         }
 412
 413         /**
 414          * Check if the cpu core id is valid for binding,
 415          * for multiple kernel thread mode.
 416          */
 417         if (multiple_kthread_on && dev_info.force_bind &&
 418                                 !cpu_online(dev_info.core_id)) {
 419                 KNI_ERR("cpu %u is not online\n", dev_info.core_id);
 420                 return -EINVAL;
 421         }
 422
 423         /* Check if it has been created */
 424         down_read(&knet->kni_list_lock);
 425         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 426                 if (kni_check_param(dev, &dev_info) < 0) {
 427                         up_read(&knet->kni_list_lock);
 428                         return -EINVAL;
 429                 }
 430         }
 431         up_read(&knet->kni_list_lock);
 432
 433         net_dev = alloc_netdev(sizeof(struct kni_dev), dev_info.name,
 434 #ifdef NET_NAME_UNKNOWN
 435                                                         NET_NAME_UNKNOWN,
 436 #endif
 437                                                         kni_net_init);
 438         if (net_dev == NULL) {
 439                 KNI_ERR("error allocating device \"%s\"\n", dev_info.name);
 440                 return -EBUSY;
 441         }
 442
 443         dev_net_set(net_dev, net);
 444
 445         kni = netdev_priv(net_dev);
 446
 447         kni->net_dev = net_dev;
 448         kni->group_id = dev_info.group_id;
 449         kni->core_id = dev_info.core_id;
 450         strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
 451
 452         /* Translate user space info into kernel space info */
 453         kni->tx_q = phys_to_virt(dev_info.tx_phys);
 454         kni->rx_q = phys_to_virt(dev_info.rx_phys);
 455         kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
 456         kni->free_q = phys_to_virt(dev_info.free_phys);
 457
 458         kni->req_q = phys_to_virt(dev_info.req_phys);
 459         kni->resp_q = phys_to_virt(dev_info.resp_phys);
 460         kni->sync_va = dev_info.sync_va;
 461         kni->sync_kva = phys_to_virt(dev_info.sync_phys);
 462
 463         kni->mbuf_kva = phys_to_virt(dev_info.mbuf_phys);
 464         kni->mbuf_va = dev_info.mbuf_va;
 465
 466 #ifdef RTE_KNI_VHOST
 467         kni->vhost_queue = NULL;
 468         kni->vq_status = BE_STOP;
 469 #endif
 470         kni->mbuf_size = dev_info.mbuf_size;
 471
 472         KNI_PRINT("tx_phys:      0x%016llx, tx_q addr:      0x%p\n",
 473                 (unsigned long long) dev_info.tx_phys, kni->tx_q);
 474         KNI_PRINT("rx_phys:      0x%016llx, rx_q addr:      0x%p\n",
 475                 (unsigned long long) dev_info.rx_phys, kni->rx_q);
 476         KNI_PRINT("alloc_phys:   0x%016llx, alloc_q addr:   0x%p\n",
 477                 (unsigned long long) dev_info.alloc_phys, kni->alloc_q);
 478         KNI_PRINT("free_phys:    0x%016llx, free_q addr:    0x%p\n",
 479                 (unsigned long long) dev_info.free_phys, kni->free_q);
 480         KNI_PRINT("req_phys:     0x%016llx, req_q addr:     0x%p\n",
 481                 (unsigned long long) dev_info.req_phys, kni->req_q);
 482         KNI_PRINT("resp_phys:    0x%016llx, resp_q addr:    0x%p\n",
 483                 (unsigned long long) dev_info.resp_phys, kni->resp_q);
 484         KNI_PRINT("mbuf_phys:    0x%016llx, mbuf_kva:       0x%p\n",
 485                 (unsigned long long) dev_info.mbuf_phys, kni->mbuf_kva);
 486         KNI_PRINT("mbuf_va:      0x%p\n", dev_info.mbuf_va);
 487         KNI_PRINT("mbuf_size:    %u\n", kni->mbuf_size);
 488
 489         KNI_DBG("PCI: %02x:%02x.%02x %04x:%04x\n",
 490                                         dev_info.bus,
 491                                         dev_info.devid,
 492                                         dev_info.function,
 493                                         dev_info.vendor_id,
 494                                         dev_info.device_id);
 495
 496         pci = pci_get_device(dev_info.vendor_id, dev_info.device_id, NULL);
 497
 498         /* Support Ethtool */
 499         while (pci) {
 500                 KNI_PRINT("pci_bus: %02x:%02x:%02x \n",
 501                                         pci->bus->number,
 502                                         PCI_SLOT(pci->devfn),
 503                                         PCI_FUNC(pci->devfn));
 504
 505                 if ((pci->bus->number == dev_info.bus) &&
 506                         (PCI_SLOT(pci->devfn) == dev_info.devid) &&
 507                         (PCI_FUNC(pci->devfn) == dev_info.function)) {
 508                         found_pci = pci;
 509
 510                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 511                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 512                         else if (pci_match_id(igb_pci_tbl, found_pci))
 513                                 ret = igb_kni_probe(found_pci, &lad_dev);
 514                         else
 515                                 ret = -1;
 516
 517                         KNI_DBG("PCI found: pci=0x%p, lad_dev=0x%p\n",
 518                                                         pci, lad_dev);
 519                         if (ret == 0) {
 520                                 kni->lad_dev = lad_dev;
 521                                 kni_set_ethtool_ops(kni->net_dev);
 522                         } else {
 523                                 KNI_ERR("Device not supported by ethtool");
 524                                 kni->lad_dev = NULL;
 525                         }
 526
 527                         kni->pci_dev = found_pci;
 528                         kni->device_id = dev_info.device_id;
 529                         break;
 530                 }
 531                 pci = pci_get_device(dev_info.vendor_id,
 532                                 dev_info.device_id, pci);
 533         }
 534         if (pci)
 535                 pci_dev_put(pci);
 536
 537         if (kni->lad_dev)
 538                 memcpy(net_dev->dev_addr, kni->lad_dev->dev_addr, ETH_ALEN);
 539         else
 540                 /*
 541                  * Generate random mac address. eth_random_addr() is the newer
 542                  * version of generating mac address in linux kernel.
 543                  */
 544                 random_ether_addr(net_dev->dev_addr);
 545
 546         ret = register_netdev(net_dev);
 547         if (ret) {
 548                 KNI_ERR("error %i registering device \"%s\"\n",
 549                                         ret, dev_info.name);
 550                 kni_dev_remove(kni);
 551                 return -ENODEV;
 552         }
 553
 554 #ifdef RTE_KNI_VHOST
 555         kni_vhost_init(kni);
 556 #endif
 557
 558         /**
 559          * Create a new kernel thread for multiple mode, set its core affinity,
 560          * and finally wake it up.
 561          */
 562         if (multiple_kthread_on) {
 563                 kni->pthread = kthread_create(kni_thread_multiple,
 564                                               (void *)kni,
 565                                               "kni_%s", kni->name);
 566                 if (IS_ERR(kni->pthread)) {
 567                         kni_dev_remove(kni);
 568                         return -ECANCELED;
 569                 }
 570                 if (dev_info.force_bind)
 571                         kthread_bind(kni->pthread, kni->core_id);
 572                 wake_up_process(kni->pthread);
 573         }
 574
 575         down_write(&knet->kni_list_lock);
 576         list_add(&kni->list, &knet->kni_list_head);
 577         up_write(&knet->kni_list_lock);
 578
 579         return 0;
 580 }
 581
 582 static int
 583 kni_ioctl_release(struct net *net,
 584                 unsigned int ioctl_num, unsigned long ioctl_param)
 585 {
 586         struct kni_net *knet = net_generic(net, kni_net_id);
 587         int ret = -EINVAL;
 588         struct kni_dev *dev, *n;
 589         struct rte_kni_device_info dev_info;
 590
 591         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 592                         return -EINVAL;
 593
 594         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 595         if (ret) {
 596                 KNI_ERR("copy_from_user in kni_ioctl_release");
 597                 return -EIO;
 598         }
 599
 600         /* Release the network device according to its name */
 601         if (strlen(dev_info.name) == 0)
 602                 return ret;
 603
 604         down_write(&knet->kni_list_lock);
 605         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 606                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 607                         continue;
 608
 609                 if (multiple_kthread_on && dev->pthread != NULL) {
 610                         kthread_stop(dev->pthread);
 611                         dev->pthread = NULL;
 612                 }
 613
 614 #ifdef RTE_KNI_VHOST
 615                 kni_vhost_backend_release(dev);
 616 #endif
 617                 kni_dev_remove(dev);
 618                 list_del(&dev->list);
 619                 ret = 0;
 620                 break;
 621         }
 622         up_write(&knet->kni_list_lock);
 623         printk(KERN_INFO "KNI: %s release kni named %s\n",
 624                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 625
 626         return ret;
 627 }
 628
 629 static int
 630 kni_ioctl(struct inode *inode,
 631         unsigned int ioctl_num,
 632         unsigned long ioctl_param)
 633 {
 634         int ret = -EINVAL;
 635         struct net *net = current->nsproxy->net_ns;
 636
 637         KNI_DBG("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 638
 639         /*
 640          * Switch according to the ioctl called
 641          */
 642         switch (_IOC_NR(ioctl_num)) {
 643         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 644                 /* For test only, not used */
 645                 break;
 646         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 647                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 648                 break;
 649         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 650                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 651                 break;
 652         default:
 653                 KNI_DBG("IOCTL default\n");
 654                 break;
 655         }
 656
 657         return ret;
 658 }
 659
 660 static int
 661 kni_compat_ioctl(struct inode *inode,
 662                 unsigned int ioctl_num,
 663                 unsigned long ioctl_param)
 664 {
 665         /* 32 bits app on 64 bits OS to be supported later */
 666         KNI_PRINT("Not implemented.\n");
 667
 668         return -EINVAL;
 669 }
 670
 671 module_init(kni_init);
 672 module_exit(kni_exit);
 673
 674 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 675 MODULE_PARM_DESC(lo_mode,
 676 "KNI loopback mode (default=lo_mode_none):\n"
 677 "    lo_mode_none        Kernel loopback disabled\n"
 678 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 679 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 680 "\n"
 681 );
 682
 683 module_param(kthread_mode, charp, S_IRUGO);
 684 MODULE_PARM_DESC(kthread_mode,
 685 "Kernel thread mode (default=single):\n"
 686 "    single    Single kernel thread mode enabled.\n"
 687 "    multiple  Multiple kernel thread mode enabled.\n"
 688 "\n"
 689 );