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