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
  62 static int kni_open(struct inode *inode, struct file *file);
  63 static int kni_release(struct inode *inode, struct file *file);
  64 static int kni_ioctl(struct inode *inode, unsigned int ioctl_num,
  65                                         unsigned long ioctl_param);
  66 static int kni_compat_ioctl(struct inode *inode, unsigned int ioctl_num,
  67                                                 unsigned long ioctl_param);
  68 static int kni_dev_remove(struct kni_dev *dev);
  69
  70 static int __init kni_parse_kthread_mode(void);
  71
  72 /* KNI processing for single kernel thread mode */
  73 static int kni_thread_single(void *unused);
  74 /* KNI processing for multiple kernel thread mode */
  75 static int kni_thread_multiple(void *param);
  76
  77 static struct file_operations kni_fops = {
  78         .owner = THIS_MODULE,
  79         .open = kni_open,
  80         .release = kni_release,
  81         .unlocked_ioctl = (void *)kni_ioctl,
  82         .compat_ioctl = (void *)kni_compat_ioctl,
  83 };
  84
  85 static struct miscdevice kni_misc = {
  86         .minor = MISC_DYNAMIC_MINOR,
  87         .name = KNI_DEVICE,
  88         .fops = &kni_fops,
  89 };
  90
  91 /* loopback mode */
  92 static char *lo_mode = NULL;
  93
  94 /* Kernel thread mode */
  95 static char *kthread_mode = NULL;
  96 static unsigned multiple_kthread_on = 0;
  97
  98 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
  99
 100 static int kni_net_id;
 101
 102 struct kni_net {
 103         unsigned long device_in_use; /* device in use flag */
 104         struct task_struct *kni_kthread;
 105         struct rw_semaphore kni_list_lock;
 106         struct list_head kni_list_head;
 107 };
 108
 109 static int __net_init kni_init_net(struct net *net)
 110 {
 111 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 112         struct kni_net *knet = net_generic(net, kni_net_id);
 113 #else
 114         struct kni_net *knet;
 115         int ret;
 116
 117         knet = kmalloc(sizeof(struct kni_net), GFP_KERNEL);
 118         if (!knet) {
 119                 ret = -ENOMEM;
 120                 return ret;
 121         }
 122 #endif
 123
 124         /* Clear the bit of device in use */
 125         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 126
 127         init_rwsem(&knet->kni_list_lock);
 128         INIT_LIST_HEAD(&knet->kni_list_head);
 129
 130 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 131         return 0;
 132 #else
 133         ret = net_assign_generic(net, kni_net_id, knet);
 134         if (ret < 0)
 135                 kfree(knet);
 136
 137         return ret;
 138 #endif
 139 }
 140
 141 static void __net_exit kni_exit_net(struct net *net)
 142 {
 143 #ifndef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 144         struct kni_net *knet = net_generic(net, kni_net_id);
 145
 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 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 172         rc = register_pernet_subsys(&kni_net_ops);
 173 #else
 174         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 175 #endif
 176         if (rc)
 177                 return -EPERM;
 178
 179         rc = misc_register(&kni_misc);
 180         if (rc != 0) {
 181                 KNI_ERR("Misc registration failed\n");
 182                 goto out;
 183         }
 184
 185         /* Configure the lo mode according to the input parameter */
 186         kni_net_config_lo_mode(lo_mode);
 187
 188         KNI_PRINT("######## DPDK kni module loaded  ########\n");
 189
 190         return 0;
 191
 192 out:
 193 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 194         unregister_pernet_subsys(&kni_net_ops);
 195 #else
 196         register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 197 #endif
 198         return rc;
 199 }
 200
 201 static void __exit
 202 kni_exit(void)
 203 {
 204         misc_deregister(&kni_misc);
 205 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 206         unregister_pernet_subsys(&kni_net_ops);
 207 #else
 208         register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 209 #endif
 210         KNI_PRINT("####### DPDK kni module unloaded  #######\n");
 211 }
 212
 213 static int __init
 214 kni_parse_kthread_mode(void)
 215 {
 216         if (!kthread_mode)
 217                 return 0;
 218
 219         if (strcmp(kthread_mode, "single") == 0)
 220                 return 0;
 221         else if (strcmp(kthread_mode, "multiple") == 0)
 222                 multiple_kthread_on = 1;
 223         else
 224                 return -1;
 225
 226         return 0;
 227 }
 228
 229 static int
 230 kni_open(struct inode *inode, struct file *file)
 231 {
 232         struct net *net = current->nsproxy->net_ns;
 233         struct kni_net *knet = net_generic(net, kni_net_id);
 234
 235         /* kni device can be opened by one user only per netns */
 236         if (test_and_set_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use))
 237                 return -EBUSY;
 238
 239         /* Create kernel thread for single mode */
 240         if (multiple_kthread_on == 0) {
 241                 KNI_PRINT("Single kernel thread for all KNI devices\n");
 242                 /* Create kernel thread for RX */
 243                 knet->kni_kthread = kthread_run(kni_thread_single, (void *)knet,
 244                                                 "kni_single");
 245                 if (IS_ERR(knet->kni_kthread)) {
 246                         KNI_ERR("Unable to create kernel threaed\n");
 247                         return PTR_ERR(knet->kni_kthread);
 248                 }
 249         } else
 250                 KNI_PRINT("Multiple kernel thread mode enabled\n");
 251
 252         file->private_data = get_net(net);
 253         KNI_PRINT("/dev/kni opened\n");
 254
 255         return 0;
 256 }
 257
 258 static int
 259 kni_release(struct inode *inode, struct file *file)
 260 {
 261         struct net *net = file->private_data;
 262         struct kni_net *knet = net_generic(net, kni_net_id);
 263         struct kni_dev *dev, *n;
 264
 265         /* Stop kernel thread for single mode */
 266         if (multiple_kthread_on == 0) {
 267                 /* Stop kernel thread */
 268                 kthread_stop(knet->kni_kthread);
 269                 knet->kni_kthread = NULL;
 270         }
 271
 272         down_write(&knet->kni_list_lock);
 273         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 274                 /* Stop kernel thread for multiple mode */
 275                 if (multiple_kthread_on && dev->pthread != NULL) {
 276                         kthread_stop(dev->pthread);
 277                         dev->pthread = NULL;
 278                 }
 279
 280 #ifdef RTE_KNI_VHOST
 281                 kni_vhost_backend_release(dev);
 282 #endif
 283                 kni_dev_remove(dev);
 284                 list_del(&dev->list);
 285         }
 286         up_write(&knet->kni_list_lock);
 287
 288         /* Clear the bit of device in use */
 289         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 290
 291         put_net(net);
 292         KNI_PRINT("/dev/kni closed\n");
 293
 294         return 0;
 295 }
 296
 297 static int
 298 kni_thread_single(void *data)
 299 {
 300         struct kni_net *knet = data;
 301         int j;
 302         struct kni_dev *dev;
 303
 304         while (!kthread_should_stop()) {
 305                 down_read(&knet->kni_list_lock);
 306                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 307                         list_for_each_entry(dev, &knet->kni_list_head, list) {
 308 #ifdef RTE_KNI_VHOST
 309                                 kni_chk_vhost_rx(dev);
 310 #else
 311                                 kni_net_rx(dev);
 312 #endif
 313                                 kni_net_poll_resp(dev);
 314                         }
 315                 }
 316                 up_read(&knet->kni_list_lock);
 317 #ifdef RTE_KNI_PREEMPT_DEFAULT
 318                 /* reschedule out for a while */
 319                 schedule_timeout_interruptible(usecs_to_jiffies( \
 320                                 KNI_KTHREAD_RESCHEDULE_INTERVAL));
 321 #endif
 322         }
 323
 324         return 0;
 325 }
 326
 327 static int
 328 kni_thread_multiple(void *param)
 329 {
 330         int j;
 331         struct kni_dev *dev = (struct kni_dev *)param;
 332
 333         while (!kthread_should_stop()) {
 334                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 335 #ifdef RTE_KNI_VHOST
 336                         kni_chk_vhost_rx(dev);
 337 #else
 338                         kni_net_rx(dev);
 339 #endif
 340                         kni_net_poll_resp(dev);
 341                 }
 342 #ifdef RTE_KNI_PREEMPT_DEFAULT
 343                 schedule_timeout_interruptible(usecs_to_jiffies( \
 344                                 KNI_KTHREAD_RESCHEDULE_INTERVAL));
 345 #endif
 346         }
 347
 348         return 0;
 349 }
 350
 351 static int
 352 kni_dev_remove(struct kni_dev *dev)
 353 {
 354         if (!dev)
 355                 return -ENODEV;
 356
 357         if (pci_match_id(ixgbe_pci_tbl, dev->pci_dev))
 358                 ixgbe_kni_remove(dev->pci_dev);
 359
 360         switch (dev->device_id) {
 361         #define RTE_PCI_DEV_ID_DECL_IGB(vend, dev) case (dev):
 362         #include <rte_pci_dev_ids.h>
 363                 igb_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
 514                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 515                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 516
 517                         switch (dev_info.device_id) {
 518                         #define RTE_PCI_DEV_ID_DECL_IGB(vend, dev) case (dev):
 519                         #include <rte_pci_dev_ids.h>
 520                                 ret = igb_kni_probe(found_pci, &lad_dev);
 521                                 break;
 522                         default:
 523                                 ret = -1;
 524                                 break;
 525                         }
 526
 527                         KNI_DBG("PCI found: pci=0x%p, lad_dev=0x%p\n",
 528                                                         pci, lad_dev);
 529                         if (ret == 0) {
 530                                 kni->lad_dev = lad_dev;
 531                                 kni_set_ethtool_ops(kni->net_dev);
 532                         } else {
 533                                 KNI_ERR("Device not supported by ethtool");
 534                                 kni->lad_dev = NULL;
 535                         }
 536
 537                         kni->pci_dev = found_pci;
 538                         kni->device_id = dev_info.device_id;
 539                         break;
 540                 }
 541                 pci = pci_get_device(dev_info.vendor_id,
 542                                 dev_info.device_id, pci);
 543         }
 544         if (pci)
 545                 pci_dev_put(pci);
 546
 547         if (kni->lad_dev)
 548                 memcpy(net_dev->dev_addr, kni->lad_dev->dev_addr, ETH_ALEN);
 549         else
 550                 /*
 551                  * Generate random mac address. eth_random_addr() is the newer
 552                  * version of generating mac address in linux kernel.
 553                  */
 554                 random_ether_addr(net_dev->dev_addr);
 555
 556         ret = register_netdev(net_dev);
 557         if (ret) {
 558                 KNI_ERR("error %i registering device \"%s\"\n",
 559                                         ret, dev_info.name);
 560                 kni_dev_remove(kni);
 561                 return -ENODEV;
 562         }
 563
 564 #ifdef RTE_KNI_VHOST
 565         kni_vhost_init(kni);
 566 #endif
 567
 568         /**
 569          * Create a new kernel thread for multiple mode, set its core affinity,
 570          * and finally wake it up.
 571          */
 572         if (multiple_kthread_on) {
 573                 kni->pthread = kthread_create(kni_thread_multiple,
 574                                               (void *)kni,
 575                                               "kni_%s", kni->name);
 576                 if (IS_ERR(kni->pthread)) {
 577                         kni_dev_remove(kni);
 578                         return -ECANCELED;
 579                 }
 580                 if (dev_info.force_bind)
 581                         kthread_bind(kni->pthread, kni->core_id);
 582                 wake_up_process(kni->pthread);
 583         }
 584
 585         down_write(&knet->kni_list_lock);
 586         list_add(&kni->list, &knet->kni_list_head);
 587         up_write(&knet->kni_list_lock);
 588
 589         return 0;
 590 }
 591
 592 static int
 593 kni_ioctl_release(struct net *net,
 594                 unsigned int ioctl_num, unsigned long ioctl_param)
 595 {
 596         struct kni_net *knet = net_generic(net, kni_net_id);
 597         int ret = -EINVAL;
 598         struct kni_dev *dev, *n;
 599         struct rte_kni_device_info dev_info;
 600
 601         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 602                         return -EINVAL;
 603
 604         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 605         if (ret) {
 606                 KNI_ERR("copy_from_user in kni_ioctl_release");
 607                 return -EIO;
 608         }
 609
 610         /* Release the network device according to its name */
 611         if (strlen(dev_info.name) == 0)
 612                 return ret;
 613
 614         down_write(&knet->kni_list_lock);
 615         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 616                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 617                         continue;
 618
 619                 if (multiple_kthread_on && dev->pthread != NULL) {
 620                         kthread_stop(dev->pthread);
 621                         dev->pthread = NULL;
 622                 }
 623
 624 #ifdef RTE_KNI_VHOST
 625                 kni_vhost_backend_release(dev);
 626 #endif
 627                 kni_dev_remove(dev);
 628                 list_del(&dev->list);
 629                 ret = 0;
 630                 break;
 631         }
 632         up_write(&knet->kni_list_lock);
 633         printk(KERN_INFO "KNI: %s release kni named %s\n",
 634                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 635
 636         return ret;
 637 }
 638
 639 static int
 640 kni_ioctl(struct inode *inode,
 641         unsigned int ioctl_num,
 642         unsigned long ioctl_param)
 643 {
 644         int ret = -EINVAL;
 645         struct net *net = current->nsproxy->net_ns;
 646
 647         KNI_DBG("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 648
 649         /*
 650          * Switch according to the ioctl called
 651          */
 652         switch (_IOC_NR(ioctl_num)) {
 653         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 654                 /* For test only, not used */
 655                 break;
 656         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 657                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 658                 break;
 659         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 660                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 661                 break;
 662         default:
 663                 KNI_DBG("IOCTL default\n");
 664                 break;
 665         }
 666
 667         return ret;
 668 }
 669
 670 static int
 671 kni_compat_ioctl(struct inode *inode,
 672                 unsigned int ioctl_num,
 673                 unsigned long ioctl_param)
 674 {
 675         /* 32 bits app on 64 bits OS to be supported later */
 676         KNI_PRINT("Not implemented.\n");
 677
 678         return -EINVAL;
 679 }
 680
 681 module_init(kni_init);
 682 module_exit(kni_exit);
 683
 684 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 685 MODULE_PARM_DESC(lo_mode,
 686 "KNI loopback mode (default=lo_mode_none):\n"
 687 "    lo_mode_none        Kernel loopback disabled\n"
 688 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 689 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 690 "\n"
 691 );
 692
 693 module_param(kthread_mode, charp, S_IRUGO);
 694 MODULE_PARM_DESC(kthread_mode,
 695 "Kernel thread mode (default=single):\n"
 696 "    single    Single kernel thread mode enabled.\n"
 697 "    multiple  Multiple kernel thread mode enabled.\n"
 698 "\n"
 699 );