drivers/staging/hv/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.h"
  31 #include "hyperv_net.h"
  32
  33
  34 enum rndis_device_state {
  35         RNDIS_DEV_UNINITIALIZED = 0,
  36         RNDIS_DEV_INITIALIZING,
  37         RNDIS_DEV_INITIALIZED,
  38         RNDIS_DEV_DATAINITIALIZED,
  39 };
  40
  41 struct rndis_device {
  42         struct netvsc_device *net_dev;
  43
  44         enum rndis_device_state state;
  45         u32 link_stat;
  46         atomic_t new_req_id;
  47
  48         spinlock_t request_lock;
  49         struct list_head req_list;
  50
  51         unsigned char hw_mac_adr[ETH_ALEN];
  52 };
  53
  54 struct rndis_request {
  55         struct list_head list_ent;
  56         struct completion  wait_event;
  57
  58         /*
  59          * FIXME: We assumed a fixed size response here. If we do ever need to
  60          * handle a bigger response, we can either define a max response
  61          * message or add a response buffer variable above this field
  62          */
  63         struct rndis_message response_msg;
  64
  65         /* Simplify allocation by having a netvsc packet inline */
  66         struct hv_netvsc_packet pkt;
  67         struct hv_page_buffer buf;
  68         /* FIXME: We assumed a fixed size request here. */
  69         struct rndis_message request_msg;
  70 };
  71
  72 static void rndis_filter_send_completion(void *ctx);
  73
  74 static void rndis_filter_send_request_completion(void *ctx);
  75
  76
  77
  78 static struct rndis_device *get_rndis_device(void)
  79 {
  80         struct rndis_device *device;
  81
  82         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  83         if (!device)
  84                 return NULL;
  85
  86         spin_lock_init(&device->request_lock);
  87
  88         INIT_LIST_HEAD(&device->req_list);
  89
  90         device->state = RNDIS_DEV_UNINITIALIZED;
  91
  92         return device;
  93 }
  94
  95 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  96                                              u32 msg_type,
  97                                              u32 msg_len)
  98 {
  99         struct rndis_request *request;
 100         struct rndis_message *rndis_msg;
 101         struct rndis_set_request *set;
 102         unsigned long flags;
 103
 104         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
 105         if (!request)
 106                 return NULL;
 107
 108         init_completion(&request->wait_event);
 109
 110         rndis_msg = &request->request_msg;
 111         rndis_msg->ndis_msg_type = msg_type;
 112         rndis_msg->msg_len = msg_len;
 113
 114         /*
 115          * Set the request id. This field is always after the rndis header for
 116          * request/response packet types so we just used the SetRequest as a
 117          * template
 118          */
 119         set = &rndis_msg->msg.set_req;
 120         set->req_id = atomic_inc_return(&dev->new_req_id);
 121
 122         /* Add to the request list */
 123         spin_lock_irqsave(&dev->request_lock, flags);
 124         list_add_tail(&request->list_ent, &dev->req_list);
 125         spin_unlock_irqrestore(&dev->request_lock, flags);
 126
 127         return request;
 128 }
 129
 130 static void put_rndis_request(struct rndis_device *dev,
 131                             struct rndis_request *req)
 132 {
 133         unsigned long flags;
 134
 135         spin_lock_irqsave(&dev->request_lock, flags);
 136         list_del(&req->list_ent);
 137         spin_unlock_irqrestore(&dev->request_lock, flags);
 138
 139         kfree(req);
 140 }
 141
 142 static void dump_rndis_message(struct hv_device *hv_dev,
 143                         struct rndis_message *rndis_msg)
 144 {
 145         struct net_device *netdev = dev_get_drvdata(&hv_dev->device);
 146
 147         switch (rndis_msg->ndis_msg_type) {
 148         case REMOTE_NDIS_PACKET_MSG:
 149                 netdev_dbg(netdev, "REMOTE_NDIS_PACKET_MSG (len %u, "
 150                            "data offset %u data len %u, # oob %u, "
 151                            "oob offset %u, oob len %u, pkt offset %u, "
 152                            "pkt len %u\n",
 153                            rndis_msg->msg_len,
 154                            rndis_msg->msg.pkt.data_offset,
 155                            rndis_msg->msg.pkt.data_len,
 156                            rndis_msg->msg.pkt.num_oob_data_elements,
 157                            rndis_msg->msg.pkt.oob_data_offset,
 158                            rndis_msg->msg.pkt.oob_data_len,
 159                            rndis_msg->msg.pkt.per_pkt_info_offset,
 160                            rndis_msg->msg.pkt.per_pkt_info_len);
 161                 break;
 162
 163         case REMOTE_NDIS_INITIALIZE_CMPLT:
 164                 netdev_dbg(netdev, "REMOTE_NDIS_INITIALIZE_CMPLT "
 165                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 166                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 167                         "pkt aligned %u)\n",
 168                         rndis_msg->msg_len,
 169                         rndis_msg->msg.init_complete.req_id,
 170                         rndis_msg->msg.init_complete.status,
 171                         rndis_msg->msg.init_complete.major_ver,
 172                         rndis_msg->msg.init_complete.minor_ver,
 173                         rndis_msg->msg.init_complete.dev_flags,
 174                         rndis_msg->msg.init_complete.max_xfer_size,
 175                         rndis_msg->msg.init_complete.
 176                            max_pkt_per_msg,
 177                         rndis_msg->msg.init_complete.
 178                            pkt_alignment_factor);
 179                 break;
 180
 181         case REMOTE_NDIS_QUERY_CMPLT:
 182                 netdev_dbg(netdev, "REMOTE_NDIS_QUERY_CMPLT "
 183                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 184                         "buf offset %u)\n",
 185                         rndis_msg->msg_len,
 186                         rndis_msg->msg.query_complete.req_id,
 187                         rndis_msg->msg.query_complete.status,
 188                         rndis_msg->msg.query_complete.
 189                            info_buflen,
 190                         rndis_msg->msg.query_complete.
 191                            info_buf_offset);
 192                 break;
 193
 194         case REMOTE_NDIS_SET_CMPLT:
 195                 netdev_dbg(netdev,
 196                         "REMOTE_NDIS_SET_CMPLT (len %u, id 0x%x, status 0x%x)\n",
 197                         rndis_msg->msg_len,
 198                         rndis_msg->msg.set_complete.req_id,
 199                         rndis_msg->msg.set_complete.status);
 200                 break;
 201
 202         case REMOTE_NDIS_INDICATE_STATUS_MSG:
 203                 netdev_dbg(netdev, "REMOTE_NDIS_INDICATE_STATUS_MSG "
 204                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 205                         rndis_msg->msg_len,
 206                         rndis_msg->msg.indicate_status.status,
 207                         rndis_msg->msg.indicate_status.status_buflen,
 208                         rndis_msg->msg.indicate_status.status_buf_offset);
 209                 break;
 210
 211         default:
 212                 netdev_dbg(netdev, "0x%x (len %u)\n",
 213                         rndis_msg->ndis_msg_type,
 214                         rndis_msg->msg_len);
 215                 break;
 216         }
 217 }
 218
 219 static int rndis_filter_send_request(struct rndis_device *dev,
 220                                   struct rndis_request *req)
 221 {
 222         int ret;
 223         struct hv_netvsc_packet *packet;
 224
 225         /* Setup the packet to send it */
 226         packet = &req->pkt;
 227
 228         packet->is_data_pkt = false;
 229         packet->total_data_buflen = req->request_msg.msg_len;
 230         packet->page_buf_cnt = 1;
 231
 232         packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
 233                                         PAGE_SHIFT;
 234         packet->page_buf[0].len = req->request_msg.msg_len;
 235         packet->page_buf[0].offset =
 236                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 237
 238         packet->completion.send.send_completion_ctx = req;/* packet; */
 239         packet->completion.send.send_completion =
 240                 rndis_filter_send_request_completion;
 241         packet->completion.send.send_completion_tid = (unsigned long)dev;
 242
 243         ret = netvsc_send(dev->net_dev->dev, packet);
 244         return ret;
 245 }
 246
 247 static void rndis_filter_receive_response(struct rndis_device *dev,
 248                                        struct rndis_message *resp)
 249 {
 250         struct rndis_request *request = NULL;
 251         bool found = false;
 252         unsigned long flags;
 253
 254         spin_lock_irqsave(&dev->request_lock, flags);
 255         list_for_each_entry(request, &dev->req_list, list_ent) {
 256                 /*
 257                  * All request/response message contains RequestId as the 1st
 258                  * field
 259                  */
 260                 if (request->request_msg.msg.init_req.req_id
 261                     == resp->msg.init_complete.req_id) {
 262                         found = true;
 263                         break;
 264                 }
 265         }
 266         spin_unlock_irqrestore(&dev->request_lock, flags);
 267
 268         if (found) {
 269                 if (resp->msg_len <= sizeof(struct rndis_message)) {
 270                         memcpy(&request->response_msg, resp,
 271                                resp->msg_len);
 272                 } else {
 273                         dev_err(&dev->net_dev->dev->device,
 274                                 "rndis response buffer overflow "
 275                                 "detected (size %u max %zu)\n",
 276                                 resp->msg_len,
 277                                 sizeof(struct rndis_filter_packet));
 278
 279                         if (resp->ndis_msg_type ==
 280                             REMOTE_NDIS_RESET_CMPLT) {
 281                                 /* does not have a request id field */
 282                                 request->response_msg.msg.reset_complete.
 283                                         status = STATUS_BUFFER_OVERFLOW;
 284                         } else {
 285                                 request->response_msg.msg.
 286                                 init_complete.status =
 287                                         STATUS_BUFFER_OVERFLOW;
 288                         }
 289                 }
 290
 291                 complete(&request->wait_event);
 292         } else {
 293                 dev_err(&dev->net_dev->dev->device,
 294                         "no rndis request found for this response "
 295                         "(id 0x%x res type 0x%x)\n",
 296                         resp->msg.init_complete.req_id,
 297                         resp->ndis_msg_type);
 298         }
 299 }
 300
 301 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 302                                              struct rndis_message *resp)
 303 {
 304         struct rndis_indicate_status *indicate =
 305                         &resp->msg.indicate_status;
 306
 307         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 308                 netvsc_linkstatus_callback(
 309                         dev->net_dev->dev, 1);
 310         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 311                 netvsc_linkstatus_callback(
 312                         dev->net_dev->dev, 0);
 313         } else {
 314                 /*
 315                  * TODO:
 316                  */
 317         }
 318 }
 319
 320 static void rndis_filter_receive_data(struct rndis_device *dev,
 321                                    struct rndis_message *msg,
 322                                    struct hv_netvsc_packet *pkt)
 323 {
 324         struct rndis_packet *rndis_pkt;
 325         u32 data_offset;
 326
 327         rndis_pkt = &msg->msg.pkt;
 328
 329         /*
 330          * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
 331          * netvsc packet (ie TotalDataBufferLength != MessageLength)
 332          */
 333
 334         /* Remove the rndis header and pass it back up the stack */
 335         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 336
 337         pkt->total_data_buflen -= data_offset;
 338         pkt->page_buf[0].offset += data_offset;
 339         pkt->page_buf[0].len -= data_offset;
 340
 341         pkt->is_data_pkt = true;
 342
 343         netvsc_recv_callback(dev->net_dev->dev, pkt);
 344 }
 345
 346 int rndis_filter_receive(struct hv_device *dev,
 347                                 struct hv_netvsc_packet *pkt)
 348 {
 349         struct netvsc_device *net_dev = dev->ext;
 350         struct rndis_device *rndis_dev;
 351         struct rndis_message rndis_msg;
 352         struct rndis_message *rndis_hdr;
 353
 354         if (!net_dev)
 355                 return -EINVAL;
 356
 357         /* Make sure the rndis device state is initialized */
 358         if (!net_dev->extension) {
 359                 dev_err(&dev->device, "got rndis message but no rndis device - "
 360                           "dropping this message!\n");
 361                 return -ENODEV;
 362         }
 363
 364         rndis_dev = (struct rndis_device *)net_dev->extension;
 365         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 366                 dev_err(&dev->device, "got rndis message but rndis device "
 367                            "uninitialized...dropping this message!\n");
 368                 return -ENODEV;
 369         }
 370
 371         rndis_hdr = (struct rndis_message *)kmap_atomic(
 372                         pfn_to_page(pkt->page_buf[0].pfn), KM_IRQ0);
 373
 374         rndis_hdr = (void *)((unsigned long)rndis_hdr +
 375                         pkt->page_buf[0].offset);
 376
 377         /* Make sure we got a valid rndis message */
 378         if ((rndis_hdr->ndis_msg_type != REMOTE_NDIS_PACKET_MSG) &&
 379             (rndis_hdr->msg_len > sizeof(struct rndis_message))) {
 380                 dev_err(&dev->device, "incoming rndis message buffer overflow "
 381                            "detected (got %u, max %zu)..marking it an error!\n",
 382                            rndis_hdr->msg_len,
 383                            sizeof(struct rndis_message));
 384         }
 385
 386         memcpy(&rndis_msg, rndis_hdr,
 387                 (rndis_hdr->msg_len > sizeof(struct rndis_message)) ?
 388                         sizeof(struct rndis_message) :
 389                         rndis_hdr->msg_len);
 390
 391         kunmap_atomic(rndis_hdr - pkt->page_buf[0].offset, KM_IRQ0);
 392
 393         dump_rndis_message(dev, &rndis_msg);
 394
 395         switch (rndis_msg.ndis_msg_type) {
 396         case REMOTE_NDIS_PACKET_MSG:
 397                 /* data msg */
 398                 rndis_filter_receive_data(rndis_dev, &rndis_msg, pkt);
 399                 break;
 400
 401         case REMOTE_NDIS_INITIALIZE_CMPLT:
 402         case REMOTE_NDIS_QUERY_CMPLT:
 403         case REMOTE_NDIS_SET_CMPLT:
 404                 /* completion msgs */
 405                 rndis_filter_receive_response(rndis_dev, &rndis_msg);
 406                 break;
 407
 408         case REMOTE_NDIS_INDICATE_STATUS_MSG:
 409                 /* notification msgs */
 410                 rndis_filter_receive_indicate_status(rndis_dev, &rndis_msg);
 411                 break;
 412         default:
 413                 dev_err(&dev->device,
 414                         "unhandled rndis message (type %u len %u)\n",
 415                            rndis_msg.ndis_msg_type,
 416                            rndis_msg.msg_len);
 417                 break;
 418         }
 419
 420         return 0;
 421 }
 422
 423 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 424                                   void *result, u32 *result_size)
 425 {
 426         struct rndis_request *request;
 427         u32 inresult_size = *result_size;
 428         struct rndis_query_request *query;
 429         struct rndis_query_complete *query_complete;
 430         int ret = 0;
 431         int t;
 432
 433         if (!result)
 434                 return -EINVAL;
 435
 436         *result_size = 0;
 437         request = get_rndis_request(dev, REMOTE_NDIS_QUERY_MSG,
 438                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 439         if (!request) {
 440                 ret = -1;
 441                 goto Cleanup;
 442         }
 443
 444         /* Setup the rndis query */
 445         query = &request->request_msg.msg.query_req;
 446         query->oid = oid;
 447         query->info_buf_offset = sizeof(struct rndis_query_request);
 448         query->info_buflen = 0;
 449         query->dev_vc_handle = 0;
 450
 451         ret = rndis_filter_send_request(dev, request);
 452         if (ret != 0)
 453                 goto Cleanup;
 454
 455         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 456         if (t == 0) {
 457                 ret = -ETIMEDOUT;
 458                 goto Cleanup;
 459         }
 460
 461         /* Copy the response back */
 462         query_complete = &request->response_msg.msg.query_complete;
 463
 464         if (query_complete->info_buflen > inresult_size) {
 465                 ret = -1;
 466                 goto Cleanup;
 467         }
 468
 469         memcpy(result,
 470                (void *)((unsigned long)query_complete +
 471                          query_complete->info_buf_offset),
 472                query_complete->info_buflen);
 473
 474         *result_size = query_complete->info_buflen;
 475
 476 Cleanup:
 477         if (request)
 478                 put_rndis_request(dev, request);
 479
 480         return ret;
 481 }
 482
 483 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 484 {
 485         u32 size = ETH_ALEN;
 486
 487         return rndis_filter_query_device(dev,
 488                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 489                                       dev->hw_mac_adr, &size);
 490 }
 491
 492 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 493 {
 494         u32 size = sizeof(u32);
 495
 496         return rndis_filter_query_device(dev,
 497                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 498                                       &dev->link_stat, &size);
 499 }
 500
 501 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 502                                       u32 new_filter)
 503 {
 504         struct rndis_request *request;
 505         struct rndis_set_request *set;
 506         struct rndis_set_complete *set_complete;
 507         u32 status;
 508         int ret, t;
 509
 510         request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
 511                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 512                         sizeof(u32));
 513         if (!request) {
 514                 ret = -1;
 515                 goto Cleanup;
 516         }
 517
 518         /* Setup the rndis set */
 519         set = &request->request_msg.msg.set_req;
 520         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 521         set->info_buflen = sizeof(u32);
 522         set->info_buf_offset = sizeof(struct rndis_set_request);
 523
 524         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 525                &new_filter, sizeof(u32));
 526
 527         ret = rndis_filter_send_request(dev, request);
 528         if (ret != 0)
 529                 goto Cleanup;
 530
 531         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 532
 533         if (t == 0) {
 534                 ret = -1;
 535                 dev_err(&dev->net_dev->dev->device,
 536                         "timeout before we got a set response...\n");
 537                 /*
 538                  * We can't deallocate the request since we may still receive a
 539                  * send completion for it.
 540                  */
 541                 goto Exit;
 542         } else {
 543                 if (ret > 0)
 544                         ret = 0;
 545                 set_complete = &request->response_msg.msg.set_complete;
 546                 status = set_complete->status;
 547         }
 548
 549 Cleanup:
 550         if (request)
 551                 put_rndis_request(dev, request);
 552 Exit:
 553         return ret;
 554 }
 555
 556
 557 static int rndis_filter_init_device(struct rndis_device *dev)
 558 {
 559         struct rndis_request *request;
 560         struct rndis_initialize_request *init;
 561         struct rndis_initialize_complete *init_complete;
 562         u32 status;
 563         int ret, t;
 564
 565         request = get_rndis_request(dev, REMOTE_NDIS_INITIALIZE_MSG,
 566                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 567         if (!request) {
 568                 ret = -1;
 569                 goto Cleanup;
 570         }
 571
 572         /* Setup the rndis set */
 573         init = &request->request_msg.msg.init_req;
 574         init->major_ver = RNDIS_MAJOR_VERSION;
 575         init->minor_ver = RNDIS_MINOR_VERSION;
 576         /* FIXME: Use 1536 - rounded ethernet frame size */
 577         init->max_xfer_size = 2048;
 578
 579         dev->state = RNDIS_DEV_INITIALIZING;
 580
 581         ret = rndis_filter_send_request(dev, request);
 582         if (ret != 0) {
 583                 dev->state = RNDIS_DEV_UNINITIALIZED;
 584                 goto Cleanup;
 585         }
 586
 587
 588         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 589
 590         if (t == 0) {
 591                 ret = -ETIMEDOUT;
 592                 goto Cleanup;
 593         }
 594
 595         init_complete = &request->response_msg.msg.init_complete;
 596         status = init_complete->status;
 597         if (status == RNDIS_STATUS_SUCCESS) {
 598                 dev->state = RNDIS_DEV_INITIALIZED;
 599                 ret = 0;
 600         } else {
 601                 dev->state = RNDIS_DEV_UNINITIALIZED;
 602                 ret = -1;
 603         }
 604
 605 Cleanup:
 606         if (request)
 607                 put_rndis_request(dev, request);
 608
 609         return ret;
 610 }
 611
 612 static void rndis_filter_halt_device(struct rndis_device *dev)
 613 {
 614         struct rndis_request *request;
 615         struct rndis_halt_request *halt;
 616
 617         /* Attempt to do a rndis device halt */
 618         request = get_rndis_request(dev, REMOTE_NDIS_HALT_MSG,
 619                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 620         if (!request)
 621                 goto Cleanup;
 622
 623         /* Setup the rndis set */
 624         halt = &request->request_msg.msg.halt_req;
 625         halt->req_id = atomic_inc_return(&dev->new_req_id);
 626
 627         /* Ignore return since this msg is optional. */
 628         rndis_filter_send_request(dev, request);
 629
 630         dev->state = RNDIS_DEV_UNINITIALIZED;
 631
 632 Cleanup:
 633         if (request)
 634                 put_rndis_request(dev, request);
 635         return;
 636 }
 637
 638 static int rndis_filter_open_device(struct rndis_device *dev)
 639 {
 640         int ret;
 641
 642         if (dev->state != RNDIS_DEV_INITIALIZED)
 643                 return 0;
 644
 645         ret = rndis_filter_set_packet_filter(dev,
 646                                          NDIS_PACKET_TYPE_BROADCAST |
 647                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 648                                          NDIS_PACKET_TYPE_DIRECTED);
 649         if (ret == 0)
 650                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 651
 652         return ret;
 653 }
 654
 655 static int rndis_filter_close_device(struct rndis_device *dev)
 656 {
 657         int ret;
 658
 659         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 660                 return 0;
 661
 662         ret = rndis_filter_set_packet_filter(dev, 0);
 663         if (ret == 0)
 664                 dev->state = RNDIS_DEV_INITIALIZED;
 665
 666         return ret;
 667 }
 668
 669 int rndis_filter_device_add(struct hv_device *dev,
 670                                   void *additional_info)
 671 {
 672         int ret;
 673         struct netvsc_device *netDevice;
 674         struct rndis_device *rndisDevice;
 675         struct netvsc_device_info *deviceInfo = additional_info;
 676
 677         rndisDevice = get_rndis_device();
 678         if (!rndisDevice)
 679                 return -1;
 680
 681         /*
 682          * Let the inner driver handle this first to create the netvsc channel
 683          * NOTE! Once the channel is created, we may get a receive callback
 684          * (RndisFilterOnReceive()) before this call is completed
 685          */
 686         ret = netvsc_device_add(dev, additional_info);
 687         if (ret != 0) {
 688                 kfree(rndisDevice);
 689                 return ret;
 690         }
 691
 692
 693         /* Initialize the rndis device */
 694         netDevice = dev->ext;
 695
 696         netDevice->extension = rndisDevice;
 697         rndisDevice->net_dev = netDevice;
 698
 699         /* Send the rndis initialization message */
 700         ret = rndis_filter_init_device(rndisDevice);
 701         if (ret != 0) {
 702                 /*
 703                  * TODO: If rndis init failed, we will need to shut down the
 704                  * channel
 705                  */
 706         }
 707
 708         /* Get the mac address */
 709         ret = rndis_filter_query_device_mac(rndisDevice);
 710         if (ret != 0) {
 711                 /*
 712                  * TODO: shutdown rndis device and the channel
 713                  */
 714         }
 715
 716         memcpy(deviceInfo->mac_adr, rndisDevice->hw_mac_adr, ETH_ALEN);
 717
 718         rndis_filter_query_device_link_status(rndisDevice);
 719
 720         deviceInfo->link_state = rndisDevice->link_stat;
 721
 722         dev_info(&dev->device, "Device MAC %pM link state %s",
 723                  rndisDevice->hw_mac_adr,
 724                  ((deviceInfo->link_state) ? ("down\n") : ("up\n")));
 725
 726         return ret;
 727 }
 728
 729 void rndis_filter_device_remove(struct hv_device *dev)
 730 {
 731         struct netvsc_device *net_dev = dev->ext;
 732         struct rndis_device *rndis_dev = net_dev->extension;
 733
 734         /* Halt and release the rndis device */
 735         rndis_filter_halt_device(rndis_dev);
 736
 737         kfree(rndis_dev);
 738         net_dev->extension = NULL;
 739
 740         netvsc_device_remove(dev);
 741 }
 742
 743
 744 int rndis_filter_open(struct hv_device *dev)
 745 {
 746         struct netvsc_device *netDevice = dev->ext;
 747
 748         if (!netDevice)
 749                 return -EINVAL;
 750
 751         return rndis_filter_open_device(netDevice->extension);
 752 }
 753
 754 int rndis_filter_close(struct hv_device *dev)
 755 {
 756         struct netvsc_device *netDevice = dev->ext;
 757
 758         if (!netDevice)
 759                 return -EINVAL;
 760
 761         return rndis_filter_close_device(netDevice->extension);
 762 }
 763
 764 int rndis_filter_send(struct hv_device *dev,
 765                              struct hv_netvsc_packet *pkt)
 766 {
 767         int ret;
 768         struct rndis_filter_packet *filterPacket;
 769         struct rndis_message *rndisMessage;
 770         struct rndis_packet *rndisPacket;
 771         u32 rndisMessageSize;
 772
 773         /* Add the rndis header */
 774         filterPacket = (struct rndis_filter_packet *)pkt->extension;
 775
 776         memset(filterPacket, 0, sizeof(struct rndis_filter_packet));
 777
 778         rndisMessage = &filterPacket->msg;
 779         rndisMessageSize = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 780
 781         rndisMessage->ndis_msg_type = REMOTE_NDIS_PACKET_MSG;
 782         rndisMessage->msg_len = pkt->total_data_buflen +
 783                                       rndisMessageSize;
 784
 785         rndisPacket = &rndisMessage->msg.pkt;
 786         rndisPacket->data_offset = sizeof(struct rndis_packet);
 787         rndisPacket->data_len = pkt->total_data_buflen;
 788
 789         pkt->is_data_pkt = true;
 790         pkt->page_buf[0].pfn = virt_to_phys(rndisMessage) >> PAGE_SHIFT;
 791         pkt->page_buf[0].offset =
 792                         (unsigned long)rndisMessage & (PAGE_SIZE-1);
 793         pkt->page_buf[0].len = rndisMessageSize;
 794
 795         /* Save the packet send completion and context */
 796         filterPacket->completion = pkt->completion.send.send_completion;
 797         filterPacket->completion_ctx =
 798                                 pkt->completion.send.send_completion_ctx;
 799
 800         /* Use ours */
 801         pkt->completion.send.send_completion = rndis_filter_send_completion;
 802         pkt->completion.send.send_completion_ctx = filterPacket;
 803
 804         ret = netvsc_send(dev, pkt);
 805         if (ret != 0) {
 806                 /*
 807                  * Reset the completion to originals to allow retries from
 808                  * above
 809                  */
 810                 pkt->completion.send.send_completion =
 811                                 filterPacket->completion;
 812                 pkt->completion.send.send_completion_ctx =
 813                                 filterPacket->completion_ctx;
 814         }
 815
 816         return ret;
 817 }
 818
 819 static void rndis_filter_send_completion(void *ctx)
 820 {
 821         struct rndis_filter_packet *filterPacket = ctx;
 822
 823         /* Pass it back to the original handler */
 824         filterPacket->completion(filterPacket->completion_ctx);
 825 }
 826
 827
 828 static void rndis_filter_send_request_completion(void *ctx)
 829 {
 830         /* Noop */
 831 }