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