drivers/staging/hv/netvsc_drv.c

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  *
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/highmem.h>
  26 #include <linux/device.h>
  27 #include <linux/io.h>
  28 #include <linux/delay.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/inetdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/in.h>
  34 #include <net/arp.h>
  35 #include <net/route.h>
  36 #include <net/sock.h>
  37 #include <net/pkt_sched.h>
  38
  39 #include "include/logging.h"
  40 #include "include/vmbus.h"
  41
  42 #include "include/NetVscApi.h"
  43
  44 MODULE_LICENSE("GPL");
  45
  46
  47 /* Static decl */
  48
  49 static int netvsc_probe(struct device *device);
  50 static int netvsc_remove(struct device *device);
  51 static int netvsc_open(struct net_device *net);
  52 static void netvsc_xmit_completion(void *context);
  53 static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net);
  54 static int netvsc_recv_callback(DEVICE_OBJECT *device_obj, NETVSC_PACKET* Packet);
  55 static int netvsc_close(struct net_device *net);
  56 static struct net_device_stats *netvsc_get_stats(struct net_device *net);
  57 static void netvsc_linkstatus_callback(DEVICE_OBJECT *device_obj, unsigned int status);
  58
  59
  60 /* Data types */
  61
  62 struct net_device_context {
  63         struct device_context   *device_ctx; /* point back to our device context */
  64         struct net_device_stats stats;
  65 };
  66
  67 struct netvsc_driver_context {
  68         /* !! These must be the first 2 fields !! */
  69         struct driver_context   drv_ctx;
  70         NETVSC_DRIVER_OBJECT    drv_obj;
  71 };
  72
  73
  74 /* Globals */
  75
  76
  77 static int netvsc_ringbuffer_size = NETVSC_DEVICE_RING_BUFFER_SIZE;
  78
  79 /* The one and only one */
  80 static struct netvsc_driver_context g_netvsc_drv;
  81
  82
  83 /* Routines */
  84
  85
  86 /*++
  87
  88 Name:   netvsc_drv_init()
  89
  90 Desc:   NetVsc driver initialization
  91
  92 --*/
  93 int netvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init)
  94 {
  95         int ret=0;
  96         NETVSC_DRIVER_OBJECT *net_drv_obj=&g_netvsc_drv.drv_obj;
  97         struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
  98
  99         DPRINT_ENTER(NETVSC_DRV);
 100
 101         vmbus_get_interface(&net_drv_obj->Base.VmbusChannelInterface);
 102
 103         net_drv_obj->RingBufferSize = netvsc_ringbuffer_size;
 104         net_drv_obj->OnReceiveCallback = netvsc_recv_callback;
 105         net_drv_obj->OnLinkStatusChanged = netvsc_linkstatus_callback;
 106
 107         /* Callback to client driver to complete the initialization */
 108         pfn_drv_init(&net_drv_obj->Base);
 109
 110         drv_ctx->driver.name = net_drv_obj->Base.name;
 111         memcpy(&drv_ctx->class_id, &net_drv_obj->Base.deviceType, sizeof(GUID));
 112
 113         drv_ctx->probe = netvsc_probe;
 114         drv_ctx->remove = netvsc_remove;
 115
 116         /* The driver belongs to vmbus */
 117         ret = vmbus_child_driver_register(drv_ctx);
 118
 119         DPRINT_EXIT(NETVSC_DRV);
 120
 121         return ret;
 122 }
 123
 124 /*++
 125
 126 Name:   netvsc_get_stats()
 127
 128 Desc:   Get the network stats
 129
 130 --*/
 131 static struct net_device_stats *netvsc_get_stats(struct net_device *net)
 132 {
 133         struct net_device_context *net_device_ctx = netdev_priv(net);
 134
 135         return &net_device_ctx->stats;
 136 }
 137
 138 /*++
 139
 140 Name:   netvsc_set_multicast_list()
 141
 142 Desc:   Set the multicast list
 143
 144 Remark: No-op here
 145 --*/
 146 static void netvsc_set_multicast_list(struct net_device *net)
 147 {
 148 }
 149
 150
 151 static const struct net_device_ops device_ops = {
 152         .ndo_open = netvsc_open,
 153         .ndo_stop = netvsc_close,
 154         .ndo_start_xmit = netvsc_start_xmit,
 155         .ndo_get_stats = netvsc_get_stats,
 156         .ndo_set_multicast_list = netvsc_set_multicast_list,
 157 };
 158
 159 /*++
 160
 161 Name:   netvsc_probe()
 162
 163 Desc:   Add the specified new device to this driver
 164
 165 --*/
 166 static int netvsc_probe(struct device *device)
 167 {
 168         int ret=0;
 169
 170         struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
 171         struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
 172         NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
 173
 174         struct device_context *device_ctx = device_to_device_context(device);
 175         DEVICE_OBJECT *device_obj = &device_ctx->device_obj;
 176
 177         struct net_device *net = NULL;
 178         struct net_device_context *net_device_ctx;
 179         NETVSC_DEVICE_INFO device_info;
 180
 181         DPRINT_ENTER(NETVSC_DRV);
 182
 183         if (!net_drv_obj->Base.OnDeviceAdd)
 184         {
 185                 return -1;
 186         }
 187
 188         net = alloc_netdev(sizeof(struct net_device_context), "seth%d", ether_setup);
 189         /* net = alloc_etherdev(sizeof(struct net_device_context)); */
 190         if (!net)
 191         {
 192                 return -1;
 193         }
 194
 195         /* Set initial state */
 196         netif_carrier_off(net);
 197         netif_stop_queue(net);
 198
 199         net_device_ctx = netdev_priv(net);
 200         net_device_ctx->device_ctx = device_ctx;
 201         dev_set_drvdata(device, net);
 202
 203         /* Notify the netvsc driver of the new device */
 204         ret = net_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info);
 205         if (ret != 0)
 206         {
 207                 free_netdev(net);
 208                 dev_set_drvdata(device, NULL);
 209
 210                 DPRINT_ERR(NETVSC_DRV, "unable to add netvsc device (ret %d)", ret);
 211                 return ret;
 212         }
 213
 214         /* If carrier is still off ie we did not get a link status callback, update it if necessary */
 215         /* FIXME: We should use a atomic or test/set instead to avoid getting out of sync with the device's link status */
 216         if (!netif_carrier_ok(net))
 217         {
 218                 if (!device_info.LinkState)
 219                 {
 220                         netif_carrier_on(net);
 221                 }
 222         }
 223
 224         memcpy(net->dev_addr, device_info.MacAddr, ETH_ALEN);
 225
 226         net->netdev_ops = &device_ops;
 227
 228         SET_NETDEV_DEV(net, device);
 229
 230         ret = register_netdev(net);
 231         if (ret != 0)
 232         {
 233                 /* Remove the device and release the resource */
 234                 net_drv_obj->Base.OnDeviceRemove(device_obj);
 235                 free_netdev(net);
 236         }
 237
 238         DPRINT_EXIT(NETVSC_DRV);
 239
 240         return ret;
 241 }
 242
 243 static int netvsc_remove(struct device *device)
 244 {
 245         int ret=0;
 246         struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
 247         struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
 248         NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
 249
 250         struct device_context *device_ctx = device_to_device_context(device);
 251         struct net_device *net = dev_get_drvdata(&device_ctx->device);
 252         DEVICE_OBJECT *device_obj = &device_ctx->device_obj;
 253
 254         DPRINT_ENTER(NETVSC_DRV);
 255
 256         if (net == NULL)
 257         {
 258                 DPRINT_INFO(NETVSC, "no net device to remove");
 259                 DPRINT_EXIT(NETVSC_DRV);
 260                 return 0;
 261         }
 262
 263         if (!net_drv_obj->Base.OnDeviceRemove)
 264         {
 265                 DPRINT_EXIT(NETVSC_DRV);
 266                 return -1;
 267         }
 268
 269         /* Stop outbound asap */
 270         netif_stop_queue(net);
 271         /* netif_carrier_off(net); */
 272
 273         unregister_netdev(net);
 274
 275         /* Call to the vsc driver to let it know that the device is being removed */
 276         ret = net_drv_obj->Base.OnDeviceRemove(device_obj);
 277         if (ret != 0)
 278         {
 279                 /* TODO: */
 280                 DPRINT_ERR(NETVSC, "unable to remove vsc device (ret %d)", ret);
 281         }
 282
 283         free_netdev(net);
 284
 285         DPRINT_EXIT(NETVSC_DRV);
 286
 287         return ret;
 288 }
 289
 290 /*++
 291
 292 Name:   netvsc_open()
 293
 294 Desc:   Open the specified interface device
 295
 296 --*/
 297 static int netvsc_open(struct net_device *net)
 298 {
 299         int ret=0;
 300         struct net_device_context *net_device_ctx = netdev_priv(net);
 301         struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
 302         struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
 303         NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
 304
 305         DEVICE_OBJECT *device_obj = &net_device_ctx->device_ctx->device_obj;
 306
 307         DPRINT_ENTER(NETVSC_DRV);
 308
 309         if (netif_carrier_ok(net))
 310         {
 311                 memset(&net_device_ctx->stats, 0 , sizeof(struct net_device_stats));
 312
 313                 /* Open up the device */
 314                 ret = net_drv_obj->OnOpen(device_obj);
 315                 if (ret != 0)
 316                 {
 317                         DPRINT_ERR(NETVSC_DRV, "unable to open device (ret %d).", ret);
 318                         return ret;
 319                 }
 320
 321                 netif_start_queue(net);
 322         }
 323         else
 324         {
 325                 DPRINT_ERR(NETVSC_DRV, "unable to open device...link is down.");
 326         }
 327
 328         DPRINT_EXIT(NETVSC_DRV);
 329         return ret;
 330 }
 331
 332 /*++
 333
 334 Name:   netvsc_close()
 335
 336 Desc:   Close the specified interface device
 337
 338 --*/
 339 static int netvsc_close(struct net_device *net)
 340 {
 341         int ret=0;
 342         struct net_device_context *net_device_ctx = netdev_priv(net);
 343         struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
 344         struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
 345         NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
 346
 347         DEVICE_OBJECT *device_obj = &net_device_ctx->device_ctx->device_obj;
 348
 349         DPRINT_ENTER(NETVSC_DRV);
 350
 351         netif_stop_queue(net);
 352
 353         ret = net_drv_obj->OnClose(device_obj);
 354         if (ret != 0)
 355         {
 356                 DPRINT_ERR(NETVSC_DRV, "unable to close device (ret %d).", ret);
 357         }
 358
 359         DPRINT_EXIT(NETVSC_DRV);
 360
 361         return ret;
 362 }
 363
 364
 365 /*++
 366
 367 Name:   netvsc_xmit_completion()
 368
 369 Desc:   Send completion processing
 370
 371 --*/
 372 static void netvsc_xmit_completion(void *context)
 373 {
 374         NETVSC_PACKET *packet = (NETVSC_PACKET *)context;
 375         struct sk_buff *skb = (struct sk_buff *)(unsigned long)packet->Completion.Send.SendCompletionTid;
 376         struct net_device* net;
 377
 378         DPRINT_ENTER(NETVSC_DRV);
 379
 380         kfree(packet);
 381
 382         if (skb)
 383         {
 384                 net = skb->dev;
 385
 386                 dev_kfree_skb_any(skb);
 387
 388                 if (netif_queue_stopped(net))
 389                 {
 390                         DPRINT_INFO(NETVSC_DRV, "net device (%p) waking up...", net);
 391
 392                         netif_wake_queue(net);
 393                 }
 394         }
 395
 396         DPRINT_EXIT(NETVSC_DRV);
 397 }
 398
 399 /*++
 400
 401 Name:   netvsc_start_xmit()
 402
 403 Desc:   Start a send
 404
 405 --*/
 406 static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net)
 407 {
 408         int ret=0;
 409         struct net_device_context *net_device_ctx = netdev_priv(net);
 410         struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
 411         struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
 412         NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
 413
 414         int i=0;
 415         NETVSC_PACKET* packet;
 416         int num_frags;
 417         int retries=0;
 418
 419         DPRINT_ENTER(NETVSC_DRV);
 420
 421         /* Support only 1 chain of frags */
 422         ASSERT(skb_shinfo(skb)->frag_list == NULL);
 423         ASSERT(skb->dev == net);
 424
 425         DPRINT_DBG(NETVSC_DRV, "xmit packet - len %d data_len %d", skb->len, skb->data_len);
 426
 427         /* Add 1 for skb->data and any additional ones requested */
 428         num_frags = skb_shinfo(skb)->nr_frags + 1 + net_drv_obj->AdditionalRequestPageBufferCount;
 429
 430         /* Allocate a netvsc packet based on # of frags. */
 431         packet = kzalloc(sizeof(NETVSC_PACKET) + (num_frags * sizeof(PAGE_BUFFER)) + net_drv_obj->RequestExtSize, GFP_ATOMIC);
 432         if (!packet)
 433         {
 434                 DPRINT_ERR(NETVSC_DRV, "unable to allocate NETVSC_PACKET");
 435                 return -1;
 436         }
 437
 438         packet->Extension = (void*)(unsigned long)packet + sizeof(NETVSC_PACKET) + (num_frags * sizeof(PAGE_BUFFER)) ;
 439
 440         /* Setup the rndis header */
 441         packet->PageBufferCount = num_frags;
 442
 443         /* TODO: Flush all write buffers/ memory fence ??? */
 444         /* wmb(); */
 445
 446         /* Initialize it from the skb */
 447         ASSERT(skb->data);
 448         packet->TotalDataBufferLength   = skb->len;
 449
 450         /* Start filling in the page buffers starting at AdditionalRequestPageBufferCount offset */
 451         packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Pfn          = virt_to_phys(skb->data) >> PAGE_SHIFT;
 452         packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Offset       = (unsigned long)skb->data & (PAGE_SIZE -1);
 453         packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Length       = skb->len - skb->data_len;
 454
 455         ASSERT((skb->len - skb->data_len) <= PAGE_SIZE);
 456
 457         for (i=net_drv_obj->AdditionalRequestPageBufferCount+1; i<num_frags; i++)
 458         {
 459                 packet->PageBuffers[i].Pfn              = page_to_pfn(skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page);
 460                 packet->PageBuffers[i].Offset   = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page_offset;
 461                 packet->PageBuffers[i].Length   = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].size;
 462         }
 463
 464         /* Set the completion routine */
 465         packet->Completion.Send.OnSendCompletion = netvsc_xmit_completion;
 466         packet->Completion.Send.SendCompletionContext = packet;
 467         packet->Completion.Send.SendCompletionTid = (unsigned long)skb;
 468
 469 retry_send:
 470         ret = net_drv_obj->OnSend(&net_device_ctx->device_ctx->device_obj, packet);
 471
 472         if (ret == 0)
 473         {
 474                 ret = NETDEV_TX_OK;
 475                 net_device_ctx->stats.tx_bytes += skb->len;
 476                 net_device_ctx->stats.tx_packets++;
 477         }
 478         else
 479         {
 480                 retries++;
 481                 if (retries < 4)
 482                 {
 483                         DPRINT_ERR(NETVSC_DRV, "unable to send...retrying %d...", retries);
 484                         udelay(100);
 485                         goto retry_send;
 486                 }
 487
 488                 /* no more room or we are shutting down */
 489                 DPRINT_ERR(NETVSC_DRV, "unable to send (%d)...marking net device (%p) busy", ret, net);
 490                 DPRINT_INFO(NETVSC_DRV, "net device (%p) stopping", net);
 491
 492                 ret = NETDEV_TX_BUSY;
 493                 net_device_ctx->stats.tx_dropped++;
 494
 495                 netif_stop_queue(net);
 496
 497                 /* Null it since the caller will free it instead of the completion routine */
 498                 packet->Completion.Send.SendCompletionTid = 0;
 499
 500                 /* Release the resources since we will not get any send completion */
 501                 netvsc_xmit_completion((void*)packet);
 502         }
 503
 504         DPRINT_DBG(NETVSC_DRV, "# of xmits %lu total size %lu", net_device_ctx->stats.tx_packets, net_device_ctx->stats.tx_bytes);
 505
 506         DPRINT_EXIT(NETVSC_DRV);
 507         return ret;
 508 }
 509
 510
 511 /*++
 512
 513 Name:   netvsc_linkstatus_callback()
 514
 515 Desc:   Link up/down notification
 516
 517 --*/
 518 static void netvsc_linkstatus_callback(DEVICE_OBJECT *device_obj, unsigned int status)
 519 {
 520         struct device_context* device_ctx = to_device_context(device_obj);
 521         struct net_device* net = dev_get_drvdata(&device_ctx->device);
 522
 523         DPRINT_ENTER(NETVSC_DRV);
 524
 525         if (!net)
 526         {
 527                 DPRINT_ERR(NETVSC_DRV, "got link status but net device not initialized yet");
 528                 return;
 529         }
 530
 531         if (status == 1)
 532         {
 533                 netif_carrier_on(net);
 534                 netif_wake_queue(net);
 535         }
 536         else
 537         {
 538                 netif_carrier_off(net);
 539                 netif_stop_queue(net);
 540         }
 541         DPRINT_EXIT(NETVSC_DRV);
 542 }
 543
 544
 545 /*++
 546
 547 Name:   netvsc_recv_callback()
 548
 549 Desc:   Callback when we receive a packet from the "wire" on the specify device
 550
 551 --*/
 552 static int netvsc_recv_callback(DEVICE_OBJECT *device_obj, NETVSC_PACKET* packet)
 553 {
 554         int ret=0;
 555         struct device_context *device_ctx = to_device_context(device_obj);
 556         struct net_device *net = dev_get_drvdata(&device_ctx->device);
 557         struct net_device_context *net_device_ctx;
 558
 559         struct sk_buff *skb;
 560         void *data;
 561         int i=0;
 562         unsigned long flags;
 563
 564         DPRINT_ENTER(NETVSC_DRV);
 565
 566         if (!net)
 567         {
 568                 DPRINT_ERR(NETVSC_DRV, "got receive callback but net device not initialized yet");
 569                 return 0;
 570         }
 571
 572         net_device_ctx = netdev_priv(net);
 573
 574         /* Allocate a skb - TODO preallocate this */
 575         /* skb = alloc_skb(packet->TotalDataBufferLength, GFP_ATOMIC); */
 576         skb = dev_alloc_skb(packet->TotalDataBufferLength + 2); /* Pad 2-bytes to align IP header to 16 bytes */
 577         ASSERT(skb);
 578         skb_reserve(skb, 2);
 579         skb->dev = net;
 580
 581         /* for kmap_atomic */
 582         local_irq_save(flags);
 583
 584         /* Copy to skb. This copy is needed here since the memory pointed by NETVSC_PACKET */
 585         /* cannot be deallocated */
 586         for (i=0; i<packet->PageBufferCount; i++)
 587         {
 588             data = kmap_atomic(pfn_to_page(packet->PageBuffers[i].Pfn), KM_IRQ1);
 589             data = (void*)(unsigned long)data + packet->PageBuffers[i].Offset;
 590
 591             memcpy(skb_put(skb, packet->PageBuffers[i].Length), data, packet->PageBuffers[i].Length);
 592
 593             kunmap_atomic((void*)((unsigned long)data - packet->PageBuffers[i].Offset), KM_IRQ1);
 594         }
 595
 596         local_irq_restore(flags);
 597
 598         skb->protocol = eth_type_trans(skb, net);
 599
 600         skb->ip_summed = CHECKSUM_NONE;
 601
 602         /* Pass the skb back up. Network stack will deallocate the skb when it is done */
 603         ret = netif_rx(skb);
 604
 605         switch (ret)
 606         {
 607         case NET_RX_DROP:
 608                 net_device_ctx->stats.rx_dropped++;
 609                 break;
 610         default:
 611                 net_device_ctx->stats.rx_packets++;
 612                 net_device_ctx->stats.rx_bytes += skb->len;
 613                 break;
 614
 615         }
 616         DPRINT_DBG(NETVSC_DRV, "# of recvs %lu total size %lu", net_device_ctx->stats.rx_packets, net_device_ctx->stats.rx_bytes);
 617
 618         DPRINT_EXIT(NETVSC_DRV);
 619
 620         return 0;
 621 }
 622
 623 static int netvsc_drv_exit_cb(struct device *dev, void *data)
 624 {
 625         struct device **curr = (struct device **)data;
 626         *curr = dev;
 627         return 1; /* stop iterating */
 628 }
 629
 630 /*++
 631
 632 Name:   netvsc_drv_exit()
 633
 634 Desc:
 635
 636 --*/
 637 void netvsc_drv_exit(void)
 638 {
 639         NETVSC_DRIVER_OBJECT *netvsc_drv_obj=&g_netvsc_drv.drv_obj;
 640         struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
 641
 642         struct device *current_dev=NULL;
 643
 644         DPRINT_ENTER(NETVSC_DRV);
 645
 646         while (1)
 647         {
 648                 current_dev = NULL;
 649
 650                 /* Get the device */
 651                 driver_for_each_device(&drv_ctx->driver, NULL, (void*)&current_dev, netvsc_drv_exit_cb);
 652
 653                 if (current_dev == NULL)
 654                         break;
 655
 656                 /* Initiate removal from the top-down */
 657                 DPRINT_INFO(NETVSC_DRV, "unregistering device (%p)...", current_dev);
 658
 659                 device_unregister(current_dev);
 660         }
 661
 662         if (netvsc_drv_obj->Base.OnCleanup)
 663                 netvsc_drv_obj->Base.OnCleanup(&netvsc_drv_obj->Base);
 664
 665         vmbus_child_driver_unregister(drv_ctx);
 666
 667         DPRINT_EXIT(NETVSC_DRV);
 668
 669         return;
 670 }
 671
 672 static int __init netvsc_init(void)
 673 {
 674         int ret;
 675
 676         DPRINT_ENTER(NETVSC_DRV);
 677         DPRINT_INFO(NETVSC_DRV, "Netvsc initializing....");
 678
 679         ret = netvsc_drv_init(NetVscInitialize);
 680
 681         DPRINT_EXIT(NETVSC_DRV);
 682
 683         return ret;
 684 }
 685
 686 static void __exit netvsc_exit(void)
 687 {
 688         DPRINT_ENTER(NETVSC_DRV);
 689
 690         netvsc_drv_exit();
 691
 692         DPRINT_EXIT(NETVSC_DRV);
 693 }
 694
 695 module_param(netvsc_ringbuffer_size, int, S_IRUGO);
 696
 697 module_init(netvsc_init);
 698 module_exit(netvsc_exit);