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 void kni_net_rx(struct kni_dev *kni);
  52 extern void kni_net_init(struct net_device *dev);
  53 extern void kni_net_config_lo_mode(char *lo_str);
  54 extern void kni_net_poll_resp(struct kni_dev *kni);
  55 extern void kni_set_ethtool_ops(struct net_device *netdev);
  56
  57 extern int ixgbe_kni_probe(struct pci_dev *pdev, struct net_device **lad_dev);
  58 extern void ixgbe_kni_remove(struct pci_dev *pdev);
  59 extern struct pci_device_id ixgbe_pci_tbl[];
  60 extern int igb_kni_probe(struct pci_dev *pdev, struct net_device **lad_dev);
  61 extern void igb_kni_remove(struct pci_dev *pdev);
  62 extern struct pci_device_id igb_pci_tbl[];
  63
  64 static int kni_open(struct inode *inode, struct file *file);
  65 static int kni_release(struct inode *inode, struct file *file);
  66 static int kni_ioctl(struct inode *inode, unsigned int ioctl_num,
  67                                         unsigned long ioctl_param);
  68 static int kni_compat_ioctl(struct inode *inode, unsigned int ioctl_num,
  69                                                 unsigned long ioctl_param);
  70 static int kni_dev_remove(struct kni_dev *dev);
  71
  72 static int __init kni_parse_kthread_mode(void);
  73
  74 /* KNI processing for single kernel thread mode */
  75 static int kni_thread_single(void *unused);
  76 /* KNI processing for multiple kernel thread mode */
  77 static int kni_thread_multiple(void *param);
  78
  79 static struct file_operations kni_fops = {
  80         .owner = THIS_MODULE,
  81         .open = kni_open,
  82         .release = kni_release,
  83         .unlocked_ioctl = (void *)kni_ioctl,
  84         .compat_ioctl = (void *)kni_compat_ioctl,
  85 };
  86
  87 static struct miscdevice kni_misc = {
  88         .minor = MISC_DYNAMIC_MINOR,
  89         .name = KNI_DEVICE,
  90         .fops = &kni_fops,
  91 };
  92
  93 /* loopback mode */
  94 static char *lo_mode = NULL;
  95
  96 /* Kernel thread mode */
  97 static char *kthread_mode = NULL;
  98 static unsigned multiple_kthread_on = 0;
  99
 100 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
 101
 102 static int kni_net_id;
 103
 104 struct kni_net {
 105         unsigned long device_in_use; /* device in use flag */
 106         struct mutex kni_kthread_lock;
 107         struct task_struct *kni_kthread;
 108         struct rw_semaphore kni_list_lock;
 109         struct list_head kni_list_head;
 110 };
 111
 112 static int __net_init kni_init_net(struct net *net)
 113 {
 114 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 115         struct kni_net *knet = net_generic(net, kni_net_id);
 116         memset(knet, 0, sizeof(*knet));
 117 #else
 118         struct kni_net *knet;
 119         int ret;
 120
 121         knet = kzalloc(sizeof(struct kni_net), GFP_KERNEL);
 122         if (!knet) {
 123                 ret = -ENOMEM;
 124                 return ret;
 125         }
 126 #endif
 127
 128         /* Clear the bit of device in use */
 129         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 130
 131         mutex_init(&knet->kni_kthread_lock);
 132
 133         init_rwsem(&knet->kni_list_lock);
 134         INIT_LIST_HEAD(&knet->kni_list_head);
 135
 136 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 137         return 0;
 138 #else
 139         ret = net_assign_generic(net, kni_net_id, knet);
 140         if (ret < 0)
 141                 kfree(knet);
 142
 143         return ret;
 144 #endif
 145 }
 146
 147 static void __net_exit kni_exit_net(struct net *net)
 148 {
 149         struct kni_net *knet = net_generic(net, kni_net_id);
 150         mutex_destroy(&knet->kni_kthread_lock);
 151 #ifndef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 152         kfree(knet);
 153 #endif
 154 }
 155
 156 static struct pernet_operations kni_net_ops = {
 157         .init = kni_init_net,
 158         .exit = kni_exit_net,
 159 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 160         .id   = &kni_net_id,
 161         .size = sizeof(struct kni_net),
 162 #endif
 163 };
 164
 165 static int __init
 166 kni_init(void)
 167 {
 168         int rc;
 169
 170         KNI_PRINT("######## DPDK kni module loading ########\n");
 171
 172         if (kni_parse_kthread_mode() < 0) {
 173                 KNI_ERR("Invalid parameter for kthread_mode\n");
 174                 return -EINVAL;
 175         }
 176
 177         if (multiple_kthread_on == 0)
 178                 KNI_PRINT("Single kernel thread for all KNI devices\n");
 179         else
 180                 KNI_PRINT("Multiple kernel thread mode enabled\n");
 181
 182 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 183         rc = register_pernet_subsys(&kni_net_ops);
 184 #else
 185         rc = register_pernet_gen_subsys(&kni_net_id, &kni_net_ops);
 186 #endif
 187         if (rc)
 188                 return -EPERM;
 189
 190         rc = misc_register(&kni_misc);
 191         if (rc != 0) {
 192                 KNI_ERR("Misc registration failed\n");
 193                 goto out;
 194         }
 195
 196         /* Configure the lo mode according to the input parameter */
 197         kni_net_config_lo_mode(lo_mode);
 198
 199         KNI_PRINT("######## DPDK kni module loaded  ########\n");
 200
 201         return 0;
 202
 203 out:
 204 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 205         unregister_pernet_subsys(&kni_net_ops);
 206 #else
 207         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 208 #endif
 209         return rc;
 210 }
 211
 212 static void __exit
 213 kni_exit(void)
 214 {
 215         misc_deregister(&kni_misc);
 216 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
 217         unregister_pernet_subsys(&kni_net_ops);
 218 #else
 219         unregister_pernet_gen_subsys(kni_net_id, &kni_net_ops);
 220 #endif
 221         KNI_PRINT("####### DPDK kni module unloaded  #######\n");
 222 }
 223
 224 static int __init
 225 kni_parse_kthread_mode(void)
 226 {
 227         if (!kthread_mode)
 228                 return 0;
 229
 230         if (strcmp(kthread_mode, "single") == 0)
 231                 return 0;
 232         else if (strcmp(kthread_mode, "multiple") == 0)
 233                 multiple_kthread_on = 1;
 234         else
 235                 return -1;
 236
 237         return 0;
 238 }
 239
 240 static int
 241 kni_open(struct inode *inode, struct file *file)
 242 {
 243         struct net *net = current->nsproxy->net_ns;
 244         struct kni_net *knet = net_generic(net, kni_net_id);
 245
 246         /* kni device can be opened by one user only per netns */
 247         if (test_and_set_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use))
 248                 return -EBUSY;
 249
 250         file->private_data = get_net(net);
 251         KNI_PRINT("/dev/kni opened\n");
 252
 253         return 0;
 254 }
 255
 256 static int
 257 kni_release(struct inode *inode, struct file *file)
 258 {
 259         struct net *net = file->private_data;
 260         struct kni_net *knet = net_generic(net, kni_net_id);
 261         struct kni_dev *dev, *n;
 262
 263         /* Stop kernel thread for single mode */
 264         if (multiple_kthread_on == 0) {
 265                 mutex_lock(&knet->kni_kthread_lock);
 266                 /* Stop kernel thread */
 267                 if (knet->kni_kthread != NULL) {
 268                         kthread_stop(knet->kni_kthread);
 269                         knet->kni_kthread = NULL;
 270                 }
 271                 mutex_unlock(&knet->kni_kthread_lock);
 272         }
 273
 274         down_write(&knet->kni_list_lock);
 275         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 276                 /* Stop kernel thread for multiple mode */
 277                 if (multiple_kthread_on && dev->pthread != NULL) {
 278                         kthread_stop(dev->pthread);
 279                         dev->pthread = NULL;
 280                 }
 281
 282 #ifdef RTE_KNI_VHOST
 283                 kni_vhost_backend_release(dev);
 284 #endif
 285                 kni_dev_remove(dev);
 286                 list_del(&dev->list);
 287         }
 288         up_write(&knet->kni_list_lock);
 289
 290         /* Clear the bit of device in use */
 291         clear_bit(KNI_DEV_IN_USE_BIT_NUM, &knet->device_in_use);
 292
 293         put_net(net);
 294         KNI_PRINT("/dev/kni closed\n");
 295
 296         return 0;
 297 }
 298
 299 static int
 300 kni_thread_single(void *data)
 301 {
 302         struct kni_net *knet = data;
 303         int j;
 304         struct kni_dev *dev;
 305
 306         while (!kthread_should_stop()) {
 307                 down_read(&knet->kni_list_lock);
 308                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 309                         list_for_each_entry(dev, &knet->kni_list_head, list) {
 310 #ifdef RTE_KNI_VHOST
 311                                 kni_chk_vhost_rx(dev);
 312 #else
 313                                 kni_net_rx(dev);
 314 #endif
 315                                 kni_net_poll_resp(dev);
 316                         }
 317                 }
 318                 up_read(&knet->kni_list_lock);
 319 #ifdef RTE_KNI_PREEMPT_DEFAULT
 320                 /* reschedule out for a while */
 321                 schedule_timeout_interruptible(usecs_to_jiffies( \
 322                                 KNI_KTHREAD_RESCHEDULE_INTERVAL));
 323 #endif
 324         }
 325
 326         return 0;
 327 }
 328
 329 static int
 330 kni_thread_multiple(void *param)
 331 {
 332         int j;
 333         struct kni_dev *dev = (struct kni_dev *)param;
 334
 335         while (!kthread_should_stop()) {
 336                 for (j = 0; j < KNI_RX_LOOP_NUM; j++) {
 337 #ifdef RTE_KNI_VHOST
 338                         kni_chk_vhost_rx(dev);
 339 #else
 340                         kni_net_rx(dev);
 341 #endif
 342                         kni_net_poll_resp(dev);
 343                 }
 344 #ifdef RTE_KNI_PREEMPT_DEFAULT
 345                 schedule_timeout_interruptible(usecs_to_jiffies( \
 346                                 KNI_KTHREAD_RESCHEDULE_INTERVAL));
 347 #endif
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int
 354 kni_dev_remove(struct kni_dev *dev)
 355 {
 356         if (!dev)
 357                 return -ENODEV;
 358
 359         if (dev->pci_dev) {
 360                 if (pci_match_id(ixgbe_pci_tbl, dev->pci_dev))
 361                         ixgbe_kni_remove(dev->pci_dev);
 362                 else if (pci_match_id(igb_pci_tbl, dev->pci_dev))
 363                         igb_kni_remove(dev->pci_dev);
 364         }
 365
 366         if (dev->net_dev) {
 367                 unregister_netdev(dev->net_dev);
 368                 free_netdev(dev->net_dev);
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int
 375 kni_check_param(struct kni_dev *kni, struct rte_kni_device_info *dev)
 376 {
 377         if (!kni || !dev)
 378                 return -1;
 379
 380         /* Check if network name has been used */
 381         if (!strncmp(kni->name, dev->name, RTE_KNI_NAMESIZE)) {
 382                 KNI_ERR("KNI name %s duplicated\n", dev->name);
 383                 return -1;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int
 390 kni_run_thread(struct kni_net *knet, struct kni_dev *kni, uint8_t force_bind)
 391 {
 392         /**
 393          * Create a new kernel thread for multiple mode, set its core affinity,
 394          * and finally wake it up.
 395          */
 396         if (multiple_kthread_on) {
 397                 kni->pthread = kthread_create(kni_thread_multiple,
 398                         (void *)kni, "kni_%s", kni->name);
 399                 if (IS_ERR(kni->pthread)) {
 400                         kni_dev_remove(kni);
 401                         return -ECANCELED;
 402                 }
 403
 404                 if (force_bind)
 405                         kthread_bind(kni->pthread, kni->core_id);
 406                 wake_up_process(kni->pthread);
 407         } else {
 408                 mutex_lock(&knet->kni_kthread_lock);
 409
 410                 if (knet->kni_kthread == NULL) {
 411                         knet->kni_kthread = kthread_create(kni_thread_single,
 412                                 (void *)knet, "kni_single");
 413                         if (IS_ERR(knet->kni_kthread)) {
 414                                 mutex_unlock(&knet->kni_kthread_lock);
 415                                 kni_dev_remove(kni);
 416                                 return -ECANCELED;
 417                         }
 418
 419                         if (force_bind)
 420                                 kthread_bind(knet->kni_kthread, kni->core_id);
 421                         wake_up_process(knet->kni_kthread);
 422                 }
 423
 424                 mutex_unlock(&knet->kni_kthread_lock);
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int
 431 kni_ioctl_create(struct net *net,
 432                 unsigned int ioctl_num, unsigned long ioctl_param)
 433 {
 434         struct kni_net *knet = net_generic(net, kni_net_id);
 435         int ret;
 436         struct rte_kni_device_info dev_info;
 437         struct pci_dev *pci = NULL;
 438         struct pci_dev *found_pci = NULL;
 439         struct net_device *net_dev = NULL;
 440         struct net_device *lad_dev = NULL;
 441         struct kni_dev *kni, *dev, *n;
 442
 443         printk(KERN_INFO "KNI: Creating kni...\n");
 444         /* Check the buffer size, to avoid warning */
 445         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 446                 return -EINVAL;
 447
 448         /* Copy kni info from user space */
 449         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 450         if (ret) {
 451                 KNI_ERR("copy_from_user in kni_ioctl_create");
 452                 return -EIO;
 453         }
 454
 455         /**
 456          * Check if the cpu core id is valid for binding.
 457          */
 458         if (dev_info.force_bind && !cpu_online(dev_info.core_id)) {
 459                 KNI_ERR("cpu %u is not online\n", dev_info.core_id);
 460                 return -EINVAL;
 461         }
 462
 463         /* Check if it has been created */
 464         down_read(&knet->kni_list_lock);
 465         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 466                 if (kni_check_param(dev, &dev_info) < 0) {
 467                         up_read(&knet->kni_list_lock);
 468                         return -EINVAL;
 469                 }
 470         }
 471         up_read(&knet->kni_list_lock);
 472
 473         net_dev = alloc_netdev(sizeof(struct kni_dev), dev_info.name,
 474 #ifdef NET_NAME_UNKNOWN
 475                                                         NET_NAME_UNKNOWN,
 476 #endif
 477                                                         kni_net_init);
 478         if (net_dev == NULL) {
 479                 KNI_ERR("error allocating device \"%s\"\n", dev_info.name);
 480                 return -EBUSY;
 481         }
 482
 483         dev_net_set(net_dev, net);
 484
 485         kni = netdev_priv(net_dev);
 486
 487         kni->net_dev = net_dev;
 488         kni->group_id = dev_info.group_id;
 489         kni->core_id = dev_info.core_id;
 490         strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
 491
 492         /* Translate user space info into kernel space info */
 493         kni->tx_q = phys_to_virt(dev_info.tx_phys);
 494         kni->rx_q = phys_to_virt(dev_info.rx_phys);
 495         kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
 496         kni->free_q = phys_to_virt(dev_info.free_phys);
 497
 498         kni->req_q = phys_to_virt(dev_info.req_phys);
 499         kni->resp_q = phys_to_virt(dev_info.resp_phys);
 500         kni->sync_va = dev_info.sync_va;
 501         kni->sync_kva = phys_to_virt(dev_info.sync_phys);
 502
 503 #ifdef RTE_KNI_VHOST
 504         kni->vhost_queue = NULL;
 505         kni->vq_status = BE_STOP;
 506 #endif
 507         kni->mbuf_size = dev_info.mbuf_size;
 508
 509         KNI_PRINT("tx_phys:      0x%016llx, tx_q addr:      0x%p\n",
 510                 (unsigned long long) dev_info.tx_phys, kni->tx_q);
 511         KNI_PRINT("rx_phys:      0x%016llx, rx_q addr:      0x%p\n",
 512                 (unsigned long long) dev_info.rx_phys, kni->rx_q);
 513         KNI_PRINT("alloc_phys:   0x%016llx, alloc_q addr:   0x%p\n",
 514                 (unsigned long long) dev_info.alloc_phys, kni->alloc_q);
 515         KNI_PRINT("free_phys:    0x%016llx, free_q addr:    0x%p\n",
 516                 (unsigned long long) dev_info.free_phys, kni->free_q);
 517         KNI_PRINT("req_phys:     0x%016llx, req_q addr:     0x%p\n",
 518                 (unsigned long long) dev_info.req_phys, kni->req_q);
 519         KNI_PRINT("resp_phys:    0x%016llx, resp_q addr:    0x%p\n",
 520                 (unsigned long long) dev_info.resp_phys, kni->resp_q);
 521         KNI_PRINT("mbuf_size:    %u\n", kni->mbuf_size);
 522
 523         KNI_DBG("PCI: %02x:%02x.%02x %04x:%04x\n",
 524                                         dev_info.bus,
 525                                         dev_info.devid,
 526                                         dev_info.function,
 527                                         dev_info.vendor_id,
 528                                         dev_info.device_id);
 529
 530         pci = pci_get_device(dev_info.vendor_id, dev_info.device_id, NULL);
 531
 532         /* Support Ethtool */
 533         while (pci) {
 534                 KNI_PRINT("pci_bus: %02x:%02x:%02x \n",
 535                                         pci->bus->number,
 536                                         PCI_SLOT(pci->devfn),
 537                                         PCI_FUNC(pci->devfn));
 538
 539                 if ((pci->bus->number == dev_info.bus) &&
 540                         (PCI_SLOT(pci->devfn) == dev_info.devid) &&
 541                         (PCI_FUNC(pci->devfn) == dev_info.function)) {
 542                         found_pci = pci;
 543
 544                         if (pci_match_id(ixgbe_pci_tbl, found_pci))
 545                                 ret = ixgbe_kni_probe(found_pci, &lad_dev);
 546                         else if (pci_match_id(igb_pci_tbl, found_pci))
 547                                 ret = igb_kni_probe(found_pci, &lad_dev);
 548                         else
 549                                 ret = -1;
 550
 551                         KNI_DBG("PCI found: pci=0x%p, lad_dev=0x%p\n",
 552                                                         pci, lad_dev);
 553                         if (ret == 0) {
 554                                 kni->lad_dev = lad_dev;
 555                                 kni_set_ethtool_ops(kni->net_dev);
 556                         } else {
 557                                 KNI_ERR("Device not supported by ethtool");
 558                                 kni->lad_dev = NULL;
 559                         }
 560
 561                         kni->pci_dev = found_pci;
 562                         kni->device_id = dev_info.device_id;
 563                         break;
 564                 }
 565                 pci = pci_get_device(dev_info.vendor_id,
 566                                 dev_info.device_id, pci);
 567         }
 568         if (pci)
 569                 pci_dev_put(pci);
 570
 571         if (kni->lad_dev)
 572                 memcpy(net_dev->dev_addr, kni->lad_dev->dev_addr, ETH_ALEN);
 573         else
 574                 /*
 575                  * Generate random mac address. eth_random_addr() is the newer
 576                  * version of generating mac address in linux kernel.
 577                  */
 578                 random_ether_addr(net_dev->dev_addr);
 579
 580         ret = register_netdev(net_dev);
 581         if (ret) {
 582                 KNI_ERR("error %i registering device \"%s\"\n",
 583                                         ret, dev_info.name);
 584                 kni->net_dev = NULL;
 585                 kni_dev_remove(kni);
 586                 free_netdev(net_dev);
 587                 return -ENODEV;
 588         }
 589
 590 #ifdef RTE_KNI_VHOST
 591         kni_vhost_init(kni);
 592 #endif
 593
 594         ret = kni_run_thread(knet, kni, dev_info.force_bind);
 595         if (ret != 0)
 596                 return ret;
 597
 598         down_write(&knet->kni_list_lock);
 599         list_add(&kni->list, &knet->kni_list_head);
 600         up_write(&knet->kni_list_lock);
 601
 602         return 0;
 603 }
 604
 605 static int
 606 kni_ioctl_release(struct net *net,
 607                 unsigned int ioctl_num, unsigned long ioctl_param)
 608 {
 609         struct kni_net *knet = net_generic(net, kni_net_id);
 610         int ret = -EINVAL;
 611         struct kni_dev *dev, *n;
 612         struct rte_kni_device_info dev_info;
 613
 614         if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 615                         return -EINVAL;
 616
 617         ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
 618         if (ret) {
 619                 KNI_ERR("copy_from_user in kni_ioctl_release");
 620                 return -EIO;
 621         }
 622
 623         /* Release the network device according to its name */
 624         if (strlen(dev_info.name) == 0)
 625                 return ret;
 626
 627         down_write(&knet->kni_list_lock);
 628         list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
 629                 if (strncmp(dev->name, dev_info.name, RTE_KNI_NAMESIZE) != 0)
 630                         continue;
 631
 632                 if (multiple_kthread_on && dev->pthread != NULL) {
 633                         kthread_stop(dev->pthread);
 634                         dev->pthread = NULL;
 635                 }
 636
 637 #ifdef RTE_KNI_VHOST
 638                 kni_vhost_backend_release(dev);
 639 #endif
 640                 kni_dev_remove(dev);
 641                 list_del(&dev->list);
 642                 ret = 0;
 643                 break;
 644         }
 645         up_write(&knet->kni_list_lock);
 646         printk(KERN_INFO "KNI: %s release kni named %s\n",
 647                 (ret == 0 ? "Successfully" : "Unsuccessfully"), dev_info.name);
 648
 649         return ret;
 650 }
 651
 652 static int
 653 kni_ioctl(struct inode *inode,
 654         unsigned int ioctl_num,
 655         unsigned long ioctl_param)
 656 {
 657         int ret = -EINVAL;
 658         struct net *net = current->nsproxy->net_ns;
 659
 660         KNI_DBG("IOCTL num=0x%0x param=0x%0lx\n", ioctl_num, ioctl_param);
 661
 662         /*
 663          * Switch according to the ioctl called
 664          */
 665         switch (_IOC_NR(ioctl_num)) {
 666         case _IOC_NR(RTE_KNI_IOCTL_TEST):
 667                 /* For test only, not used */
 668                 break;
 669         case _IOC_NR(RTE_KNI_IOCTL_CREATE):
 670                 ret = kni_ioctl_create(net, ioctl_num, ioctl_param);
 671                 break;
 672         case _IOC_NR(RTE_KNI_IOCTL_RELEASE):
 673                 ret = kni_ioctl_release(net, ioctl_num, ioctl_param);
 674                 break;
 675         default:
 676                 KNI_DBG("IOCTL default\n");
 677                 break;
 678         }
 679
 680         return ret;
 681 }
 682
 683 static int
 684 kni_compat_ioctl(struct inode *inode,
 685                 unsigned int ioctl_num,
 686                 unsigned long ioctl_param)
 687 {
 688         /* 32 bits app on 64 bits OS to be supported later */
 689         KNI_PRINT("Not implemented.\n");
 690
 691         return -EINVAL;
 692 }
 693
 694 module_init(kni_init);
 695 module_exit(kni_exit);
 696
 697 module_param(lo_mode, charp, S_IRUGO | S_IWUSR);
 698 MODULE_PARM_DESC(lo_mode,
 699 "KNI loopback mode (default=lo_mode_none):\n"
 700 "    lo_mode_none        Kernel loopback disabled\n"
 701 "    lo_mode_fifo        Enable kernel loopback with fifo\n"
 702 "    lo_mode_fifo_skb    Enable kernel loopback with fifo and skb buffer\n"
 703 "\n"
 704 );
 705
 706 module_param(kthread_mode, charp, S_IRUGO);
 707 MODULE_PARM_DESC(kthread_mode,
 708 "Kernel thread mode (default=single):\n"
 709 "    single    Single kernel thread mode enabled.\n"
 710 "    multiple  Multiple kernel thread mode enabled.\n"
 711 "\n"
 712 );