drivers/net/hyperv/rndis_filter.c

   1 /*
   2  * Copyright (c) 2009, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Authors:
  18  *   Haiyang Zhang <haiyangz@microsoft.com>
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/wait.h>
  24 #include <linux/highmem.h>
  25 #include <linux/slab.h>
  26 #include <linux/io.h>
  27 #include <linux/if_ether.h>
  28 #include <linux/netdevice.h>
  29
  30 #include "hyperv_net.h"
  31
  32
  33 struct rndis_request {
  34         struct list_head list_ent;
  35         struct completion  wait_event;
  36
  37         /*
  38          * FIXME: We assumed a fixed size response here. If we do ever need to
  39          * handle a bigger response, we can either define a max response
  40          * message or add a response buffer variable above this field
  41          */
  42         struct rndis_message response_msg;
  43
  44         /* Simplify allocation by having a netvsc packet inline */
  45         struct hv_netvsc_packet pkt;
  46         struct hv_page_buffer buf;
  47         /* FIXME: We assumed a fixed size request here. */
  48         struct rndis_message request_msg;
  49 };
  50
  51 static void rndis_filter_send_completion(void *ctx);
  52
  53 static void rndis_filter_send_request_completion(void *ctx);
  54
  55
  56
  57 static struct rndis_device *get_rndis_device(void)
  58 {
  59         struct rndis_device *device;
  60
  61         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  62         if (!device)
  63                 return NULL;
  64
  65         spin_lock_init(&device->request_lock);
  66
  67         INIT_LIST_HEAD(&device->req_list);
  68
  69         device->state = RNDIS_DEV_UNINITIALIZED;
  70
  71         return device;
  72 }
  73
  74 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  75                                              u32 msg_type,
  76                                              u32 msg_len)
  77 {
  78         struct rndis_request *request;
  79         struct rndis_message *rndis_msg;
  80         struct rndis_set_request *set;
  81         unsigned long flags;
  82
  83         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  84         if (!request)
  85                 return NULL;
  86
  87         init_completion(&request->wait_event);
  88
  89         rndis_msg = &request->request_msg;
  90         rndis_msg->ndis_msg_type = msg_type;
  91         rndis_msg->msg_len = msg_len;
  92
  93         /*
  94          * Set the request id. This field is always after the rndis header for
  95          * request/response packet types so we just used the SetRequest as a
  96          * template
  97          */
  98         set = &rndis_msg->msg.set_req;
  99         set->req_id = atomic_inc_return(&dev->new_req_id);
 100
 101         /* Add to the request list */
 102         spin_lock_irqsave(&dev->request_lock, flags);
 103         list_add_tail(&request->list_ent, &dev->req_list);
 104         spin_unlock_irqrestore(&dev->request_lock, flags);
 105
 106         return request;
 107 }
 108
 109 static void put_rndis_request(struct rndis_device *dev,
 110                             struct rndis_request *req)
 111 {
 112         unsigned long flags;
 113
 114         spin_lock_irqsave(&dev->request_lock, flags);
 115         list_del(&req->list_ent);
 116         spin_unlock_irqrestore(&dev->request_lock, flags);
 117
 118         kfree(req);
 119 }
 120
 121 static void dump_rndis_message(struct hv_device *hv_dev,
 122                         struct rndis_message *rndis_msg)
 123 {
 124         struct net_device *netdev;
 125         struct netvsc_device *net_device;
 126
 127         net_device = hv_get_drvdata(hv_dev);
 128         netdev = net_device->ndev;
 129
 130         switch (rndis_msg->ndis_msg_type) {
 131         case REMOTE_NDIS_PACKET_MSG:
 132                 netdev_dbg(netdev, "REMOTE_NDIS_PACKET_MSG (len %u, "
 133                            "data offset %u data len %u, # oob %u, "
 134                            "oob offset %u, oob len %u, pkt offset %u, "
 135                            "pkt len %u\n",
 136                            rndis_msg->msg_len,
 137                            rndis_msg->msg.pkt.data_offset,
 138                            rndis_msg->msg.pkt.data_len,
 139                            rndis_msg->msg.pkt.num_oob_data_elements,
 140                            rndis_msg->msg.pkt.oob_data_offset,
 141                            rndis_msg->msg.pkt.oob_data_len,
 142                            rndis_msg->msg.pkt.per_pkt_info_offset,
 143                            rndis_msg->msg.pkt.per_pkt_info_len);
 144                 break;
 145
 146         case REMOTE_NDIS_INITIALIZE_CMPLT:
 147                 netdev_dbg(netdev, "REMOTE_NDIS_INITIALIZE_CMPLT "
 148                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 149                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 150                         "pkt aligned %u)\n",
 151                         rndis_msg->msg_len,
 152                         rndis_msg->msg.init_complete.req_id,
 153                         rndis_msg->msg.init_complete.status,
 154                         rndis_msg->msg.init_complete.major_ver,
 155                         rndis_msg->msg.init_complete.minor_ver,
 156                         rndis_msg->msg.init_complete.dev_flags,
 157                         rndis_msg->msg.init_complete.max_xfer_size,
 158                         rndis_msg->msg.init_complete.
 159                            max_pkt_per_msg,
 160                         rndis_msg->msg.init_complete.
 161                            pkt_alignment_factor);
 162                 break;
 163
 164         case REMOTE_NDIS_QUERY_CMPLT:
 165                 netdev_dbg(netdev, "REMOTE_NDIS_QUERY_CMPLT "
 166                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 167                         "buf offset %u)\n",
 168                         rndis_msg->msg_len,
 169                         rndis_msg->msg.query_complete.req_id,
 170                         rndis_msg->msg.query_complete.status,
 171                         rndis_msg->msg.query_complete.
 172                            info_buflen,
 173                         rndis_msg->msg.query_complete.
 174                            info_buf_offset);
 175                 break;
 176
 177         case REMOTE_NDIS_SET_CMPLT:
 178                 netdev_dbg(netdev,
 179                         "REMOTE_NDIS_SET_CMPLT (len %u, id 0x%x, status 0x%x)\n",
 180                         rndis_msg->msg_len,
 181                         rndis_msg->msg.set_complete.req_id,
 182                         rndis_msg->msg.set_complete.status);
 183                 break;
 184
 185         case REMOTE_NDIS_INDICATE_STATUS_MSG:
 186                 netdev_dbg(netdev, "REMOTE_NDIS_INDICATE_STATUS_MSG "
 187                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 188                         rndis_msg->msg_len,
 189                         rndis_msg->msg.indicate_status.status,
 190                         rndis_msg->msg.indicate_status.status_buflen,
 191                         rndis_msg->msg.indicate_status.status_buf_offset);
 192                 break;
 193
 194         default:
 195                 netdev_dbg(netdev, "0x%x (len %u)\n",
 196                         rndis_msg->ndis_msg_type,
 197                         rndis_msg->msg_len);
 198                 break;
 199         }
 200 }
 201
 202 static int rndis_filter_send_request(struct rndis_device *dev,
 203                                   struct rndis_request *req)
 204 {
 205         int ret;
 206         struct hv_netvsc_packet *packet;
 207
 208         /* Setup the packet to send it */
 209         packet = &req->pkt;
 210
 211         packet->is_data_pkt = false;
 212         packet->total_data_buflen = req->request_msg.msg_len;
 213         packet->page_buf_cnt = 1;
 214
 215         packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
 216                                         PAGE_SHIFT;
 217         packet->page_buf[0].len = req->request_msg.msg_len;
 218         packet->page_buf[0].offset =
 219                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 220
 221         packet->completion.send.send_completion_ctx = req;/* packet; */
 222         packet->completion.send.send_completion =
 223                 rndis_filter_send_request_completion;
 224         packet->completion.send.send_completion_tid = (unsigned long)dev;
 225
 226         ret = netvsc_send(dev->net_dev->dev, packet);
 227         return ret;
 228 }
 229
 230 static void rndis_filter_receive_response(struct rndis_device *dev,
 231                                        struct rndis_message *resp)
 232 {
 233         struct rndis_request *request = NULL;
 234         bool found = false;
 235         unsigned long flags;
 236         struct net_device *ndev;
 237
 238         ndev = dev->net_dev->ndev;
 239
 240         spin_lock_irqsave(&dev->request_lock, flags);
 241         list_for_each_entry(request, &dev->req_list, list_ent) {
 242                 /*
 243                  * All request/response message contains RequestId as the 1st
 244                  * field
 245                  */
 246                 if (request->request_msg.msg.init_req.req_id
 247                     == resp->msg.init_complete.req_id) {
 248                         found = true;
 249                         break;
 250                 }
 251         }
 252         spin_unlock_irqrestore(&dev->request_lock, flags);
 253
 254         if (found) {
 255                 if (resp->msg_len <= sizeof(struct rndis_message)) {
 256                         memcpy(&request->response_msg, resp,
 257                                resp->msg_len);
 258                 } else {
 259                         netdev_err(ndev,
 260                                 "rndis response buffer overflow "
 261                                 "detected (size %u max %zu)\n",
 262                                 resp->msg_len,
 263                                 sizeof(struct rndis_filter_packet));
 264
 265                         if (resp->ndis_msg_type ==
 266                             REMOTE_NDIS_RESET_CMPLT) {
 267                                 /* does not have a request id field */
 268                                 request->response_msg.msg.reset_complete.
 269                                         status = STATUS_BUFFER_OVERFLOW;
 270                         } else {
 271                                 request->response_msg.msg.
 272                                 init_complete.status =
 273                                         STATUS_BUFFER_OVERFLOW;
 274                         }
 275                 }
 276
 277                 complete(&request->wait_event);
 278         } else {
 279                 netdev_err(ndev,
 280                         "no rndis request found for this response "
 281                         "(id 0x%x res type 0x%x)\n",
 282                         resp->msg.init_complete.req_id,
 283                         resp->ndis_msg_type);
 284         }
 285 }
 286
 287 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 288                                              struct rndis_message *resp)
 289 {
 290         struct rndis_indicate_status *indicate =
 291                         &resp->msg.indicate_status;
 292
 293         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 294                 netvsc_linkstatus_callback(
 295                         dev->net_dev->dev, 1);
 296         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 297                 netvsc_linkstatus_callback(
 298                         dev->net_dev->dev, 0);
 299         } else {
 300                 /*
 301                  * TODO:
 302                  */
 303         }
 304 }
 305
 306 static void rndis_filter_receive_data(struct rndis_device *dev,
 307                                    struct rndis_message *msg,
 308                                    struct hv_netvsc_packet *pkt)
 309 {
 310         struct rndis_packet *rndis_pkt;
 311         u32 data_offset;
 312
 313         rndis_pkt = &msg->msg.pkt;
 314
 315         /*
 316          * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
 317          * netvsc packet (ie TotalDataBufferLength != MessageLength)
 318          */
 319
 320         /* Remove the rndis header and pass it back up the stack */
 321         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 322
 323         pkt->total_data_buflen -= data_offset;
 324         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 325
 326         pkt->is_data_pkt = true;
 327
 328         netvsc_recv_callback(dev->net_dev->dev, pkt);
 329 }
 330
 331 int rndis_filter_receive(struct hv_device *dev,
 332                                 struct hv_netvsc_packet *pkt)
 333 {
 334         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 335         struct rndis_device *rndis_dev;
 336         struct rndis_message rndis_msg;
 337         struct rndis_message *rndis_hdr;
 338         struct net_device *ndev;
 339
 340         if (!net_dev)
 341                 return -EINVAL;
 342
 343         ndev = net_dev->ndev;
 344
 345         /* Make sure the rndis device state is initialized */
 346         if (!net_dev->extension) {
 347                 netdev_err(ndev, "got rndis message but no rndis device - "
 348                           "dropping this message!\n");
 349                 return -ENODEV;
 350         }
 351
 352         rndis_dev = (struct rndis_device *)net_dev->extension;
 353         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 354                 netdev_err(ndev, "got rndis message but rndis device "
 355                            "uninitialized...dropping this message!\n");
 356                 return -ENODEV;
 357         }
 358
 359         rndis_hdr = pkt->data;
 360
 361         /* Make sure we got a valid rndis message */
 362         if ((rndis_hdr->ndis_msg_type != REMOTE_NDIS_PACKET_MSG) &&
 363             (rndis_hdr->msg_len > sizeof(struct rndis_message))) {
 364                 netdev_err(ndev, "incoming rndis message buffer overflow "
 365                            "detected (got %u, max %zu)..marking it an error!\n",
 366                            rndis_hdr->msg_len,
 367                            sizeof(struct rndis_message));
 368         }
 369
 370         memcpy(&rndis_msg, rndis_hdr,
 371                 (rndis_hdr->msg_len > sizeof(struct rndis_message)) ?
 372                         sizeof(struct rndis_message) :
 373                         rndis_hdr->msg_len);
 374
 375         dump_rndis_message(dev, &rndis_msg);
 376
 377         switch (rndis_msg.ndis_msg_type) {
 378         case REMOTE_NDIS_PACKET_MSG:
 379                 /* data msg */
 380                 rndis_filter_receive_data(rndis_dev, &rndis_msg, pkt);
 381                 break;
 382
 383         case REMOTE_NDIS_INITIALIZE_CMPLT:
 384         case REMOTE_NDIS_QUERY_CMPLT:
 385         case REMOTE_NDIS_SET_CMPLT:
 386                 /* completion msgs */
 387                 rndis_filter_receive_response(rndis_dev, &rndis_msg);
 388                 break;
 389
 390         case REMOTE_NDIS_INDICATE_STATUS_MSG:
 391                 /* notification msgs */
 392                 rndis_filter_receive_indicate_status(rndis_dev, &rndis_msg);
 393                 break;
 394         default:
 395                 netdev_err(ndev,
 396                         "unhandled rndis message (type %u len %u)\n",
 397                            rndis_msg.ndis_msg_type,
 398                            rndis_msg.msg_len);
 399                 break;
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 406                                   void *result, u32 *result_size)
 407 {
 408         struct rndis_request *request;
 409         u32 inresult_size = *result_size;
 410         struct rndis_query_request *query;
 411         struct rndis_query_complete *query_complete;
 412         int ret = 0;
 413         int t;
 414
 415         if (!result)
 416                 return -EINVAL;
 417
 418         *result_size = 0;
 419         request = get_rndis_request(dev, REMOTE_NDIS_QUERY_MSG,
 420                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 421         if (!request) {
 422                 ret = -ENOMEM;
 423                 goto cleanup;
 424         }
 425
 426         /* Setup the rndis query */
 427         query = &request->request_msg.msg.query_req;
 428         query->oid = oid;
 429         query->info_buf_offset = sizeof(struct rndis_query_request);
 430         query->info_buflen = 0;
 431         query->dev_vc_handle = 0;
 432
 433         ret = rndis_filter_send_request(dev, request);
 434         if (ret != 0)
 435                 goto cleanup;
 436
 437         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 438         if (t == 0) {
 439                 ret = -ETIMEDOUT;
 440                 goto cleanup;
 441         }
 442
 443         /* Copy the response back */
 444         query_complete = &request->response_msg.msg.query_complete;
 445
 446         if (query_complete->info_buflen > inresult_size) {
 447                 ret = -1;
 448                 goto cleanup;
 449         }
 450
 451         memcpy(result,
 452                (void *)((unsigned long)query_complete +
 453                          query_complete->info_buf_offset),
 454                query_complete->info_buflen);
 455
 456         *result_size = query_complete->info_buflen;
 457
 458 cleanup:
 459         if (request)
 460                 put_rndis_request(dev, request);
 461
 462         return ret;
 463 }
 464
 465 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 466 {
 467         u32 size = ETH_ALEN;
 468
 469         return rndis_filter_query_device(dev,
 470                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 471                                       dev->hw_mac_adr, &size);
 472 }
 473
 474 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 475 {
 476         u32 size = sizeof(u32);
 477         u32 link_status;
 478         int ret;
 479
 480         ret = rndis_filter_query_device(dev,
 481                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 482                                       &link_status, &size);
 483         dev->link_state = (link_status != 0) ? true : false;
 484
 485         return ret;
 486 }
 487
 488 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 489 {
 490         struct rndis_request *request;
 491         struct rndis_set_request *set;
 492         struct rndis_set_complete *set_complete;
 493         u32 status;
 494         int ret, t;
 495         struct net_device *ndev;
 496
 497         ndev = dev->net_dev->ndev;
 498
 499         request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
 500                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 501                         sizeof(u32));
 502         if (!request) {
 503                 ret = -ENOMEM;
 504                 goto cleanup;
 505         }
 506
 507         /* Setup the rndis set */
 508         set = &request->request_msg.msg.set_req;
 509         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 510         set->info_buflen = sizeof(u32);
 511         set->info_buf_offset = sizeof(struct rndis_set_request);
 512
 513         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 514                &new_filter, sizeof(u32));
 515
 516         ret = rndis_filter_send_request(dev, request);
 517         if (ret != 0)
 518                 goto cleanup;
 519
 520         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 521
 522         if (t == 0) {
 523                 netdev_err(ndev,
 524                         "timeout before we got a set response...\n");
 525                 /*
 526                  * We can't deallocate the request since we may still receive a
 527                  * send completion for it.
 528                  */
 529                 goto exit;
 530         } else {
 531                 set_complete = &request->response_msg.msg.set_complete;
 532                 status = set_complete->status;
 533         }
 534
 535 cleanup:
 536         if (request)
 537                 put_rndis_request(dev, request);
 538 exit:
 539         return ret;
 540 }
 541
 542
 543 static int rndis_filter_init_device(struct rndis_device *dev)
 544 {
 545         struct rndis_request *request;
 546         struct rndis_initialize_request *init;
 547         struct rndis_initialize_complete *init_complete;
 548         u32 status;
 549         int ret, t;
 550
 551         request = get_rndis_request(dev, REMOTE_NDIS_INITIALIZE_MSG,
 552                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 553         if (!request) {
 554                 ret = -ENOMEM;
 555                 goto cleanup;
 556         }
 557
 558         /* Setup the rndis set */
 559         init = &request->request_msg.msg.init_req;
 560         init->major_ver = RNDIS_MAJOR_VERSION;
 561         init->minor_ver = RNDIS_MINOR_VERSION;
 562         /* FIXME: Use 1536 - rounded ethernet frame size */
 563         init->max_xfer_size = 2048;
 564
 565         dev->state = RNDIS_DEV_INITIALIZING;
 566
 567         ret = rndis_filter_send_request(dev, request);
 568         if (ret != 0) {
 569                 dev->state = RNDIS_DEV_UNINITIALIZED;
 570                 goto cleanup;
 571         }
 572
 573
 574         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 575
 576         if (t == 0) {
 577                 ret = -ETIMEDOUT;
 578                 goto cleanup;
 579         }
 580
 581         init_complete = &request->response_msg.msg.init_complete;
 582         status = init_complete->status;
 583         if (status == RNDIS_STATUS_SUCCESS) {
 584                 dev->state = RNDIS_DEV_INITIALIZED;
 585                 ret = 0;
 586         } else {
 587                 dev->state = RNDIS_DEV_UNINITIALIZED;
 588                 ret = -EINVAL;
 589         }
 590
 591 cleanup:
 592         if (request)
 593                 put_rndis_request(dev, request);
 594
 595         return ret;
 596 }
 597
 598 static void rndis_filter_halt_device(struct rndis_device *dev)
 599 {
 600         struct rndis_request *request;
 601         struct rndis_halt_request *halt;
 602
 603         /* Attempt to do a rndis device halt */
 604         request = get_rndis_request(dev, REMOTE_NDIS_HALT_MSG,
 605                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 606         if (!request)
 607                 goto cleanup;
 608
 609         /* Setup the rndis set */
 610         halt = &request->request_msg.msg.halt_req;
 611         halt->req_id = atomic_inc_return(&dev->new_req_id);
 612
 613         /* Ignore return since this msg is optional. */
 614         rndis_filter_send_request(dev, request);
 615
 616         dev->state = RNDIS_DEV_UNINITIALIZED;
 617
 618 cleanup:
 619         if (request)
 620                 put_rndis_request(dev, request);
 621         return;
 622 }
 623
 624 static int rndis_filter_open_device(struct rndis_device *dev)
 625 {
 626         int ret;
 627
 628         if (dev->state != RNDIS_DEV_INITIALIZED)
 629                 return 0;
 630
 631         ret = rndis_filter_set_packet_filter(dev,
 632                                          NDIS_PACKET_TYPE_BROADCAST |
 633                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 634                                          NDIS_PACKET_TYPE_DIRECTED);
 635         if (ret == 0)
 636                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 637
 638         return ret;
 639 }
 640
 641 static int rndis_filter_close_device(struct rndis_device *dev)
 642 {
 643         int ret;
 644
 645         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 646                 return 0;
 647
 648         ret = rndis_filter_set_packet_filter(dev, 0);
 649         if (ret == 0)
 650                 dev->state = RNDIS_DEV_INITIALIZED;
 651
 652         return ret;
 653 }
 654
 655 int rndis_filter_device_add(struct hv_device *dev,
 656                                   void *additional_info)
 657 {
 658         int ret;
 659         struct netvsc_device *net_device;
 660         struct rndis_device *rndis_device;
 661         struct netvsc_device_info *device_info = additional_info;
 662
 663         rndis_device = get_rndis_device();
 664         if (!rndis_device)
 665                 return -ENODEV;
 666
 667         /*
 668          * Let the inner driver handle this first to create the netvsc channel
 669          * NOTE! Once the channel is created, we may get a receive callback
 670          * (RndisFilterOnReceive()) before this call is completed
 671          */
 672         ret = netvsc_device_add(dev, additional_info);
 673         if (ret != 0) {
 674                 kfree(rndis_device);
 675                 return ret;
 676         }
 677
 678
 679         /* Initialize the rndis device */
 680         net_device = hv_get_drvdata(dev);
 681
 682         net_device->extension = rndis_device;
 683         rndis_device->net_dev = net_device;
 684
 685         /* Send the rndis initialization message */
 686         ret = rndis_filter_init_device(rndis_device);
 687         if (ret != 0) {
 688                 /*
 689                  * TODO: If rndis init failed, we will need to shut down the
 690                  * channel
 691                  */
 692         }
 693
 694         /* Get the mac address */
 695         ret = rndis_filter_query_device_mac(rndis_device);
 696         if (ret != 0) {
 697                 /*
 698                  * TODO: shutdown rndis device and the channel
 699                  */
 700         }
 701
 702         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 703
 704         rndis_filter_query_device_link_status(rndis_device);
 705
 706         device_info->link_state = rndis_device->link_state;
 707
 708         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 709                  rndis_device->hw_mac_adr,
 710                  device_info->link_state ? "down" : "up");
 711
 712         return ret;
 713 }
 714
 715 void rndis_filter_device_remove(struct hv_device *dev)
 716 {
 717         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 718         struct rndis_device *rndis_dev = net_dev->extension;
 719
 720         /* Halt and release the rndis device */
 721         rndis_filter_halt_device(rndis_dev);
 722
 723         kfree(rndis_dev);
 724         net_dev->extension = NULL;
 725
 726         netvsc_device_remove(dev);
 727 }
 728
 729
 730 int rndis_filter_open(struct hv_device *dev)
 731 {
 732         struct netvsc_device *net_device = hv_get_drvdata(dev);
 733
 734         if (!net_device)
 735                 return -EINVAL;
 736
 737         return rndis_filter_open_device(net_device->extension);
 738 }
 739
 740 int rndis_filter_close(struct hv_device *dev)
 741 {
 742         struct netvsc_device *netDevice = hv_get_drvdata(dev);
 743
 744         if (!netDevice)
 745                 return -EINVAL;
 746
 747         return rndis_filter_close_device(netDevice->extension);
 748 }
 749
 750 int rndis_filter_send(struct hv_device *dev,
 751                              struct hv_netvsc_packet *pkt)
 752 {
 753         int ret;
 754         struct rndis_filter_packet *filterPacket;
 755         struct rndis_message *rndisMessage;
 756         struct rndis_packet *rndisPacket;
 757         u32 rndisMessageSize;
 758
 759         /* Add the rndis header */
 760         filterPacket = (struct rndis_filter_packet *)pkt->extension;
 761
 762         memset(filterPacket, 0, sizeof(struct rndis_filter_packet));
 763
 764         rndisMessage = &filterPacket->msg;
 765         rndisMessageSize = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 766
 767         rndisMessage->ndis_msg_type = REMOTE_NDIS_PACKET_MSG;
 768         rndisMessage->msg_len = pkt->total_data_buflen +
 769                                       rndisMessageSize;
 770
 771         rndisPacket = &rndisMessage->msg.pkt;
 772         rndisPacket->data_offset = sizeof(struct rndis_packet);
 773         rndisPacket->data_len = pkt->total_data_buflen;
 774
 775         pkt->is_data_pkt = true;
 776         pkt->page_buf[0].pfn = virt_to_phys(rndisMessage) >> PAGE_SHIFT;
 777         pkt->page_buf[0].offset =
 778                         (unsigned long)rndisMessage & (PAGE_SIZE-1);
 779         pkt->page_buf[0].len = rndisMessageSize;
 780
 781         /* Save the packet send completion and context */
 782         filterPacket->completion = pkt->completion.send.send_completion;
 783         filterPacket->completion_ctx =
 784                                 pkt->completion.send.send_completion_ctx;
 785
 786         /* Use ours */
 787         pkt->completion.send.send_completion = rndis_filter_send_completion;
 788         pkt->completion.send.send_completion_ctx = filterPacket;
 789
 790         ret = netvsc_send(dev, pkt);
 791         if (ret != 0) {
 792                 /*
 793                  * Reset the completion to originals to allow retries from
 794                  * above
 795                  */
 796                 pkt->completion.send.send_completion =
 797                                 filterPacket->completion;
 798                 pkt->completion.send.send_completion_ctx =
 799                                 filterPacket->completion_ctx;
 800         }
 801
 802         return ret;
 803 }
 804
 805 static void rndis_filter_send_completion(void *ctx)
 806 {
 807         struct rndis_filter_packet *filterPacket = ctx;
 808
 809         /* Pass it back to the original handler */
 810         filterPacket->completion(filterPacket->completion_ctx);
 811 }
 812
 813
 814 static void rndis_filter_send_request_completion(void *ctx)
 815 {
 816         /* Noop */
 817 }