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
 325         /*
 326          * Make sure we got a valid RNDIS message, now total_data_buflen
 327          * should be the data packet size plus the trailer padding size
 328          */
 329         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 330                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 331                            "overflow detected (got %u, min %u)"
 332                            "...dropping this message!\n",
 333                            pkt->total_data_buflen, rndis_pkt->data_len);
 334                 return;
 335         }
 336
 337         /*
 338          * Remove the rndis trailer padding from rndis packet message
 339          * rndis_pkt->data_len tell us the real data length, we only copy
 340          * the data packet to the stack, without the rndis trailer padding
 341          */
 342         pkt->total_data_buflen = rndis_pkt->data_len;
 343         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 344
 345         pkt->is_data_pkt = true;
 346
 347         netvsc_recv_callback(dev->net_dev->dev, pkt);
 348 }
 349
 350 int rndis_filter_receive(struct hv_device *dev,
 351                                 struct hv_netvsc_packet *pkt)
 352 {
 353         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 354         struct rndis_device *rndis_dev;
 355         struct rndis_message rndis_msg;
 356         struct rndis_message *rndis_hdr;
 357         struct net_device *ndev;
 358
 359         if (!net_dev)
 360                 return -EINVAL;
 361
 362         ndev = net_dev->ndev;
 363
 364         /* Make sure the rndis device state is initialized */
 365         if (!net_dev->extension) {
 366                 netdev_err(ndev, "got rndis message but no rndis device - "
 367                           "dropping this message!\n");
 368                 return -ENODEV;
 369         }
 370
 371         rndis_dev = (struct rndis_device *)net_dev->extension;
 372         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 373                 netdev_err(ndev, "got rndis message but rndis device "
 374                            "uninitialized...dropping this message!\n");
 375                 return -ENODEV;
 376         }
 377
 378         rndis_hdr = pkt->data;
 379
 380         /* Make sure we got a valid rndis message */
 381         if ((rndis_hdr->ndis_msg_type != REMOTE_NDIS_PACKET_MSG) &&
 382             (rndis_hdr->msg_len > sizeof(struct rndis_message))) {
 383                 netdev_err(ndev, "incoming rndis message buffer overflow "
 384                            "detected (got %u, max %zu)..marking it an error!\n",
 385                            rndis_hdr->msg_len,
 386                            sizeof(struct rndis_message));
 387         }
 388
 389         memcpy(&rndis_msg, rndis_hdr,
 390                 (rndis_hdr->msg_len > sizeof(struct rndis_message)) ?
 391                         sizeof(struct rndis_message) :
 392                         rndis_hdr->msg_len);
 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         u32 link_status;
 497         int ret;
 498
 499         ret = rndis_filter_query_device(dev,
 500                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 501                                       &link_status, &size);
 502         dev->link_state = (link_status != 0) ? true : false;
 503
 504         return ret;
 505 }
 506
 507 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 508 {
 509         struct rndis_request *request;
 510         struct rndis_set_request *set;
 511         struct rndis_set_complete *set_complete;
 512         u32 status;
 513         int ret, t;
 514         struct net_device *ndev;
 515
 516         ndev = dev->net_dev->ndev;
 517
 518         request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
 519                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 520                         sizeof(u32));
 521         if (!request) {
 522                 ret = -ENOMEM;
 523                 goto cleanup;
 524         }
 525
 526         /* Setup the rndis set */
 527         set = &request->request_msg.msg.set_req;
 528         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 529         set->info_buflen = sizeof(u32);
 530         set->info_buf_offset = sizeof(struct rndis_set_request);
 531
 532         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 533                &new_filter, sizeof(u32));
 534
 535         ret = rndis_filter_send_request(dev, request);
 536         if (ret != 0)
 537                 goto cleanup;
 538
 539         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 540
 541         if (t == 0) {
 542                 netdev_err(ndev,
 543                         "timeout before we got a set response...\n");
 544                 /*
 545                  * We can't deallocate the request since we may still receive a
 546                  * send completion for it.
 547                  */
 548                 goto exit;
 549         } else {
 550                 set_complete = &request->response_msg.msg.set_complete;
 551                 status = set_complete->status;
 552         }
 553
 554 cleanup:
 555         if (request)
 556                 put_rndis_request(dev, request);
 557 exit:
 558         return ret;
 559 }
 560
 561
 562 static int rndis_filter_init_device(struct rndis_device *dev)
 563 {
 564         struct rndis_request *request;
 565         struct rndis_initialize_request *init;
 566         struct rndis_initialize_complete *init_complete;
 567         u32 status;
 568         int ret, t;
 569
 570         request = get_rndis_request(dev, REMOTE_NDIS_INITIALIZE_MSG,
 571                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 572         if (!request) {
 573                 ret = -ENOMEM;
 574                 goto cleanup;
 575         }
 576
 577         /* Setup the rndis set */
 578         init = &request->request_msg.msg.init_req;
 579         init->major_ver = RNDIS_MAJOR_VERSION;
 580         init->minor_ver = RNDIS_MINOR_VERSION;
 581         /* FIXME: Use 1536 - rounded ethernet frame size */
 582         init->max_xfer_size = 2048;
 583
 584         dev->state = RNDIS_DEV_INITIALIZING;
 585
 586         ret = rndis_filter_send_request(dev, request);
 587         if (ret != 0) {
 588                 dev->state = RNDIS_DEV_UNINITIALIZED;
 589                 goto cleanup;
 590         }
 591
 592
 593         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 594
 595         if (t == 0) {
 596                 ret = -ETIMEDOUT;
 597                 goto cleanup;
 598         }
 599
 600         init_complete = &request->response_msg.msg.init_complete;
 601         status = init_complete->status;
 602         if (status == RNDIS_STATUS_SUCCESS) {
 603                 dev->state = RNDIS_DEV_INITIALIZED;
 604                 ret = 0;
 605         } else {
 606                 dev->state = RNDIS_DEV_UNINITIALIZED;
 607                 ret = -EINVAL;
 608         }
 609
 610 cleanup:
 611         if (request)
 612                 put_rndis_request(dev, request);
 613
 614         return ret;
 615 }
 616
 617 static void rndis_filter_halt_device(struct rndis_device *dev)
 618 {
 619         struct rndis_request *request;
 620         struct rndis_halt_request *halt;
 621
 622         /* Attempt to do a rndis device halt */
 623         request = get_rndis_request(dev, REMOTE_NDIS_HALT_MSG,
 624                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 625         if (!request)
 626                 goto cleanup;
 627
 628         /* Setup the rndis set */
 629         halt = &request->request_msg.msg.halt_req;
 630         halt->req_id = atomic_inc_return(&dev->new_req_id);
 631
 632         /* Ignore return since this msg is optional. */
 633         rndis_filter_send_request(dev, request);
 634
 635         dev->state = RNDIS_DEV_UNINITIALIZED;
 636
 637 cleanup:
 638         if (request)
 639                 put_rndis_request(dev, request);
 640         return;
 641 }
 642
 643 static int rndis_filter_open_device(struct rndis_device *dev)
 644 {
 645         int ret;
 646
 647         if (dev->state != RNDIS_DEV_INITIALIZED)
 648                 return 0;
 649
 650         ret = rndis_filter_set_packet_filter(dev,
 651                                          NDIS_PACKET_TYPE_BROADCAST |
 652                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 653                                          NDIS_PACKET_TYPE_DIRECTED);
 654         if (ret == 0)
 655                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 656
 657         return ret;
 658 }
 659
 660 static int rndis_filter_close_device(struct rndis_device *dev)
 661 {
 662         int ret;
 663
 664         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 665                 return 0;
 666
 667         ret = rndis_filter_set_packet_filter(dev, 0);
 668         if (ret == 0)
 669                 dev->state = RNDIS_DEV_INITIALIZED;
 670
 671         return ret;
 672 }
 673
 674 int rndis_filter_device_add(struct hv_device *dev,
 675                                   void *additional_info)
 676 {
 677         int ret;
 678         struct netvsc_device *net_device;
 679         struct rndis_device *rndis_device;
 680         struct netvsc_device_info *device_info = additional_info;
 681
 682         rndis_device = get_rndis_device();
 683         if (!rndis_device)
 684                 return -ENODEV;
 685
 686         /*
 687          * Let the inner driver handle this first to create the netvsc channel
 688          * NOTE! Once the channel is created, we may get a receive callback
 689          * (RndisFilterOnReceive()) before this call is completed
 690          */
 691         ret = netvsc_device_add(dev, additional_info);
 692         if (ret != 0) {
 693                 kfree(rndis_device);
 694                 return ret;
 695         }
 696
 697
 698         /* Initialize the rndis device */
 699         net_device = hv_get_drvdata(dev);
 700
 701         net_device->extension = rndis_device;
 702         rndis_device->net_dev = net_device;
 703
 704         /* Send the rndis initialization message */
 705         ret = rndis_filter_init_device(rndis_device);
 706         if (ret != 0) {
 707                 /*
 708                  * TODO: If rndis init failed, we will need to shut down the
 709                  * channel
 710                  */
 711         }
 712
 713         /* Get the mac address */
 714         ret = rndis_filter_query_device_mac(rndis_device);
 715         if (ret != 0) {
 716                 /*
 717                  * TODO: shutdown rndis device and the channel
 718                  */
 719         }
 720
 721         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 722
 723         rndis_filter_query_device_link_status(rndis_device);
 724
 725         device_info->link_state = rndis_device->link_state;
 726
 727         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 728                  rndis_device->hw_mac_adr,
 729                  device_info->link_state ? "down" : "up");
 730
 731         return ret;
 732 }
 733
 734 void rndis_filter_device_remove(struct hv_device *dev)
 735 {
 736         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 737         struct rndis_device *rndis_dev = net_dev->extension;
 738
 739         /* Halt and release the rndis device */
 740         rndis_filter_halt_device(rndis_dev);
 741
 742         kfree(rndis_dev);
 743         net_dev->extension = NULL;
 744
 745         netvsc_device_remove(dev);
 746 }
 747
 748
 749 int rndis_filter_open(struct hv_device *dev)
 750 {
 751         struct netvsc_device *net_device = hv_get_drvdata(dev);
 752
 753         if (!net_device)
 754                 return -EINVAL;
 755
 756         return rndis_filter_open_device(net_device->extension);
 757 }
 758
 759 int rndis_filter_close(struct hv_device *dev)
 760 {
 761         struct netvsc_device *netDevice = hv_get_drvdata(dev);
 762
 763         if (!netDevice)
 764                 return -EINVAL;
 765
 766         return rndis_filter_close_device(netDevice->extension);
 767 }
 768
 769 int rndis_filter_send(struct hv_device *dev,
 770                              struct hv_netvsc_packet *pkt)
 771 {
 772         int ret;
 773         struct rndis_filter_packet *filterPacket;
 774         struct rndis_message *rndisMessage;
 775         struct rndis_packet *rndisPacket;
 776         u32 rndisMessageSize;
 777
 778         /* Add the rndis header */
 779         filterPacket = (struct rndis_filter_packet *)pkt->extension;
 780
 781         memset(filterPacket, 0, sizeof(struct rndis_filter_packet));
 782
 783         rndisMessage = &filterPacket->msg;
 784         rndisMessageSize = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 785
 786         rndisMessage->ndis_msg_type = REMOTE_NDIS_PACKET_MSG;
 787         rndisMessage->msg_len = pkt->total_data_buflen +
 788                                       rndisMessageSize;
 789
 790         rndisPacket = &rndisMessage->msg.pkt;
 791         rndisPacket->data_offset = sizeof(struct rndis_packet);
 792         rndisPacket->data_len = pkt->total_data_buflen;
 793
 794         pkt->is_data_pkt = true;
 795         pkt->page_buf[0].pfn = virt_to_phys(rndisMessage) >> PAGE_SHIFT;
 796         pkt->page_buf[0].offset =
 797                         (unsigned long)rndisMessage & (PAGE_SIZE-1);
 798         pkt->page_buf[0].len = rndisMessageSize;
 799
 800         /* Add one page_buf if the rndis msg goes beyond page boundary */
 801         if (pkt->page_buf[0].offset + rndisMessageSize > PAGE_SIZE) {
 802                 int i;
 803                 for (i = pkt->page_buf_cnt; i > 1; i--)
 804                         pkt->page_buf[i] = pkt->page_buf[i-1];
 805                 pkt->page_buf_cnt++;
 806                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 807                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 808                         rndisMessage + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 809                 pkt->page_buf[1].offset = 0;
 810                 pkt->page_buf[1].len = rndisMessageSize - pkt->page_buf[0].len;
 811         }
 812
 813         /* Save the packet send completion and context */
 814         filterPacket->completion = pkt->completion.send.send_completion;
 815         filterPacket->completion_ctx =
 816                                 pkt->completion.send.send_completion_ctx;
 817
 818         /* Use ours */
 819         pkt->completion.send.send_completion = rndis_filter_send_completion;
 820         pkt->completion.send.send_completion_ctx = filterPacket;
 821
 822         ret = netvsc_send(dev, pkt);
 823         if (ret != 0) {
 824                 /*
 825                  * Reset the completion to originals to allow retries from
 826                  * above
 827                  */
 828                 pkt->completion.send.send_completion =
 829                                 filterPacket->completion;
 830                 pkt->completion.send.send_completion_ctx =
 831                                 filterPacket->completion_ctx;
 832         }
 833
 834         return ret;
 835 }
 836
 837 static void rndis_filter_send_completion(void *ctx)
 838 {
 839         struct rndis_filter_packet *filterPacket = ctx;
 840
 841         /* Pass it back to the original handler */
 842         filterPacket->completion(filterPacket->completion_ctx);
 843 }
 844
 845
 846 static void rndis_filter_send_request_completion(void *ctx)
 847 {
 848         /* Noop */
 849 }