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 #include <linux/if_vlan.h>
  30 #include <linux/nls.h>
  31
  32 #include "hyperv_net.h"
  33
  34
  35 struct rndis_request {
  36         struct list_head list_ent;
  37         struct completion  wait_event;
  38
  39         /*
  40          * FIXME: We assumed a fixed size response here. If we do ever need to
  41          * handle a bigger response, we can either define a max response
  42          * message or add a response buffer variable above this field
  43          */
  44         struct rndis_message response_msg;
  45
  46         /* Simplify allocation by having a netvsc packet inline */
  47         struct hv_netvsc_packet pkt;
  48         struct hv_page_buffer buf;
  49         /* FIXME: We assumed a fixed size request here. */
  50         struct rndis_message request_msg;
  51         u8 ext[100];
  52 };
  53
  54 static void rndis_filter_send_completion(void *ctx);
  55
  56 static void rndis_filter_send_request_completion(void *ctx);
  57
  58
  59
  60 static struct rndis_device *get_rndis_device(void)
  61 {
  62         struct rndis_device *device;
  63
  64         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  65         if (!device)
  66                 return NULL;
  67
  68         spin_lock_init(&device->request_lock);
  69
  70         INIT_LIST_HEAD(&device->req_list);
  71
  72         device->state = RNDIS_DEV_UNINITIALIZED;
  73
  74         return device;
  75 }
  76
  77 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  78                                              u32 msg_type,
  79                                              u32 msg_len)
  80 {
  81         struct rndis_request *request;
  82         struct rndis_message *rndis_msg;
  83         struct rndis_set_request *set;
  84         unsigned long flags;
  85
  86         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  87         if (!request)
  88                 return NULL;
  89
  90         init_completion(&request->wait_event);
  91
  92         rndis_msg = &request->request_msg;
  93         rndis_msg->ndis_msg_type = msg_type;
  94         rndis_msg->msg_len = msg_len;
  95
  96         /*
  97          * Set the request id. This field is always after the rndis header for
  98          * request/response packet types so we just used the SetRequest as a
  99          * template
 100          */
 101         set = &rndis_msg->msg.set_req;
 102         set->req_id = atomic_inc_return(&dev->new_req_id);
 103
 104         /* Add to the request list */
 105         spin_lock_irqsave(&dev->request_lock, flags);
 106         list_add_tail(&request->list_ent, &dev->req_list);
 107         spin_unlock_irqrestore(&dev->request_lock, flags);
 108
 109         return request;
 110 }
 111
 112 static void put_rndis_request(struct rndis_device *dev,
 113                             struct rndis_request *req)
 114 {
 115         unsigned long flags;
 116
 117         spin_lock_irqsave(&dev->request_lock, flags);
 118         list_del(&req->list_ent);
 119         spin_unlock_irqrestore(&dev->request_lock, flags);
 120
 121         kfree(req);
 122 }
 123
 124 static void dump_rndis_message(struct hv_device *hv_dev,
 125                         struct rndis_message *rndis_msg)
 126 {
 127         struct net_device *netdev;
 128         struct netvsc_device *net_device;
 129
 130         net_device = hv_get_drvdata(hv_dev);
 131         netdev = net_device->ndev;
 132
 133         switch (rndis_msg->ndis_msg_type) {
 134         case RNDIS_MSG_PACKET:
 135                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 136                            "data offset %u data len %u, # oob %u, "
 137                            "oob offset %u, oob len %u, pkt offset %u, "
 138                            "pkt len %u\n",
 139                            rndis_msg->msg_len,
 140                            rndis_msg->msg.pkt.data_offset,
 141                            rndis_msg->msg.pkt.data_len,
 142                            rndis_msg->msg.pkt.num_oob_data_elements,
 143                            rndis_msg->msg.pkt.oob_data_offset,
 144                            rndis_msg->msg.pkt.oob_data_len,
 145                            rndis_msg->msg.pkt.per_pkt_info_offset,
 146                            rndis_msg->msg.pkt.per_pkt_info_len);
 147                 break;
 148
 149         case RNDIS_MSG_INIT_C:
 150                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 151                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 152                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 153                         "pkt aligned %u)\n",
 154                         rndis_msg->msg_len,
 155                         rndis_msg->msg.init_complete.req_id,
 156                         rndis_msg->msg.init_complete.status,
 157                         rndis_msg->msg.init_complete.major_ver,
 158                         rndis_msg->msg.init_complete.minor_ver,
 159                         rndis_msg->msg.init_complete.dev_flags,
 160                         rndis_msg->msg.init_complete.max_xfer_size,
 161                         rndis_msg->msg.init_complete.
 162                            max_pkt_per_msg,
 163                         rndis_msg->msg.init_complete.
 164                            pkt_alignment_factor);
 165                 break;
 166
 167         case RNDIS_MSG_QUERY_C:
 168                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 169                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 170                         "buf offset %u)\n",
 171                         rndis_msg->msg_len,
 172                         rndis_msg->msg.query_complete.req_id,
 173                         rndis_msg->msg.query_complete.status,
 174                         rndis_msg->msg.query_complete.
 175                            info_buflen,
 176                         rndis_msg->msg.query_complete.
 177                            info_buf_offset);
 178                 break;
 179
 180         case RNDIS_MSG_SET_C:
 181                 netdev_dbg(netdev,
 182                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 183                         rndis_msg->msg_len,
 184                         rndis_msg->msg.set_complete.req_id,
 185                         rndis_msg->msg.set_complete.status);
 186                 break;
 187
 188         case RNDIS_MSG_INDICATE:
 189                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 190                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 191                         rndis_msg->msg_len,
 192                         rndis_msg->msg.indicate_status.status,
 193                         rndis_msg->msg.indicate_status.status_buflen,
 194                         rndis_msg->msg.indicate_status.status_buf_offset);
 195                 break;
 196
 197         default:
 198                 netdev_dbg(netdev, "0x%x (len %u)\n",
 199                         rndis_msg->ndis_msg_type,
 200                         rndis_msg->msg_len);
 201                 break;
 202         }
 203 }
 204
 205 static int rndis_filter_send_request(struct rndis_device *dev,
 206                                   struct rndis_request *req)
 207 {
 208         int ret;
 209         struct hv_netvsc_packet *packet;
 210
 211         /* Setup the packet to send it */
 212         packet = &req->pkt;
 213
 214         packet->is_data_pkt = false;
 215         packet->total_data_buflen = req->request_msg.msg_len;
 216         packet->page_buf_cnt = 1;
 217
 218         packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
 219                                         PAGE_SHIFT;
 220         packet->page_buf[0].len = req->request_msg.msg_len;
 221         packet->page_buf[0].offset =
 222                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 223
 224         packet->completion.send.send_completion_ctx = req;/* packet; */
 225         packet->completion.send.send_completion =
 226                 rndis_filter_send_request_completion;
 227         packet->completion.send.send_completion_tid = (unsigned long)dev;
 228
 229         ret = netvsc_send(dev->net_dev->dev, packet);
 230         return ret;
 231 }
 232
 233 static void rndis_filter_receive_response(struct rndis_device *dev,
 234                                        struct rndis_message *resp)
 235 {
 236         struct rndis_request *request = NULL;
 237         bool found = false;
 238         unsigned long flags;
 239         struct net_device *ndev;
 240
 241         ndev = dev->net_dev->ndev;
 242
 243         spin_lock_irqsave(&dev->request_lock, flags);
 244         list_for_each_entry(request, &dev->req_list, list_ent) {
 245                 /*
 246                  * All request/response message contains RequestId as the 1st
 247                  * field
 248                  */
 249                 if (request->request_msg.msg.init_req.req_id
 250                     == resp->msg.init_complete.req_id) {
 251                         found = true;
 252                         break;
 253                 }
 254         }
 255         spin_unlock_irqrestore(&dev->request_lock, flags);
 256
 257         if (found) {
 258                 if (resp->msg_len <= sizeof(struct rndis_message)) {
 259                         memcpy(&request->response_msg, resp,
 260                                resp->msg_len);
 261                 } else {
 262                         netdev_err(ndev,
 263                                 "rndis response buffer overflow "
 264                                 "detected (size %u max %zu)\n",
 265                                 resp->msg_len,
 266                                 sizeof(struct rndis_filter_packet));
 267
 268                         if (resp->ndis_msg_type ==
 269                             RNDIS_MSG_RESET_C) {
 270                                 /* does not have a request id field */
 271                                 request->response_msg.msg.reset_complete.
 272                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 273                         } else {
 274                                 request->response_msg.msg.
 275                                 init_complete.status =
 276                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 277                         }
 278                 }
 279
 280                 complete(&request->wait_event);
 281         } else {
 282                 netdev_err(ndev,
 283                         "no rndis request found for this response "
 284                         "(id 0x%x res type 0x%x)\n",
 285                         resp->msg.init_complete.req_id,
 286                         resp->ndis_msg_type);
 287         }
 288 }
 289
 290 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 291                                              struct rndis_message *resp)
 292 {
 293         struct rndis_indicate_status *indicate =
 294                         &resp->msg.indicate_status;
 295
 296         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 297                 netvsc_linkstatus_callback(
 298                         dev->net_dev->dev, 1);
 299         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 300                 netvsc_linkstatus_callback(
 301                         dev->net_dev->dev, 0);
 302         } else {
 303                 /*
 304                  * TODO:
 305                  */
 306         }
 307 }
 308
 309 /*
 310  * Get the Per-Packet-Info with the specified type
 311  * return NULL if not found.
 312  */
 313 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 314 {
 315         struct rndis_per_packet_info *ppi;
 316         int len;
 317
 318         if (rpkt->per_pkt_info_offset == 0)
 319                 return NULL;
 320
 321         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 322                 rpkt->per_pkt_info_offset);
 323         len = rpkt->per_pkt_info_len;
 324
 325         while (len > 0) {
 326                 if (ppi->type == type)
 327                         return (void *)((ulong)ppi + ppi->ppi_offset);
 328                 len -= ppi->size;
 329                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 330         }
 331
 332         return NULL;
 333 }
 334
 335 static void rndis_filter_receive_data(struct rndis_device *dev,
 336                                    struct rndis_message *msg,
 337                                    struct hv_netvsc_packet *pkt)
 338 {
 339         struct rndis_packet *rndis_pkt;
 340         u32 data_offset;
 341         struct ndis_pkt_8021q_info *vlan;
 342
 343         rndis_pkt = &msg->msg.pkt;
 344
 345         /*
 346          * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
 347          * netvsc packet (ie TotalDataBufferLength != MessageLength)
 348          */
 349
 350         /* Remove the rndis header and pass it back up the stack */
 351         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 352
 353         pkt->total_data_buflen -= data_offset;
 354
 355         /*
 356          * Make sure we got a valid RNDIS message, now total_data_buflen
 357          * should be the data packet size plus the trailer padding size
 358          */
 359         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 360                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 361                            "overflow detected (got %u, min %u)"
 362                            "...dropping this message!\n",
 363                            pkt->total_data_buflen, rndis_pkt->data_len);
 364                 return;
 365         }
 366
 367         /*
 368          * Remove the rndis trailer padding from rndis packet message
 369          * rndis_pkt->data_len tell us the real data length, we only copy
 370          * the data packet to the stack, without the rndis trailer padding
 371          */
 372         pkt->total_data_buflen = rndis_pkt->data_len;
 373         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 374
 375         pkt->is_data_pkt = true;
 376
 377         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 378         if (vlan) {
 379                 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
 380                         (vlan->pri << VLAN_PRIO_SHIFT);
 381         } else {
 382                 pkt->vlan_tci = 0;
 383         }
 384
 385         netvsc_recv_callback(dev->net_dev->dev, pkt);
 386 }
 387
 388 int rndis_filter_receive(struct hv_device *dev,
 389                                 struct hv_netvsc_packet *pkt)
 390 {
 391         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 392         struct rndis_device *rndis_dev;
 393         struct rndis_message *rndis_msg;
 394         struct net_device *ndev;
 395
 396         if (!net_dev)
 397                 return -EINVAL;
 398
 399         ndev = net_dev->ndev;
 400
 401         /* Make sure the rndis device state is initialized */
 402         if (!net_dev->extension) {
 403                 netdev_err(ndev, "got rndis message but no rndis device - "
 404                           "dropping this message!\n");
 405                 return -ENODEV;
 406         }
 407
 408         rndis_dev = (struct rndis_device *)net_dev->extension;
 409         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 410                 netdev_err(ndev, "got rndis message but rndis device "
 411                            "uninitialized...dropping this message!\n");
 412                 return -ENODEV;
 413         }
 414
 415         rndis_msg = pkt->data;
 416
 417         dump_rndis_message(dev, rndis_msg);
 418
 419         switch (rndis_msg->ndis_msg_type) {
 420         case RNDIS_MSG_PACKET:
 421                 /* data msg */
 422                 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
 423                 break;
 424
 425         case RNDIS_MSG_INIT_C:
 426         case RNDIS_MSG_QUERY_C:
 427         case RNDIS_MSG_SET_C:
 428                 /* completion msgs */
 429                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 430                 break;
 431
 432         case RNDIS_MSG_INDICATE:
 433                 /* notification msgs */
 434                 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
 435                 break;
 436         default:
 437                 netdev_err(ndev,
 438                         "unhandled rndis message (type %u len %u)\n",
 439                            rndis_msg->ndis_msg_type,
 440                            rndis_msg->msg_len);
 441                 break;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 448                                   void *result, u32 *result_size)
 449 {
 450         struct rndis_request *request;
 451         u32 inresult_size = *result_size;
 452         struct rndis_query_request *query;
 453         struct rndis_query_complete *query_complete;
 454         int ret = 0;
 455         int t;
 456
 457         if (!result)
 458                 return -EINVAL;
 459
 460         *result_size = 0;
 461         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 462                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 463         if (!request) {
 464                 ret = -ENOMEM;
 465                 goto cleanup;
 466         }
 467
 468         /* Setup the rndis query */
 469         query = &request->request_msg.msg.query_req;
 470         query->oid = oid;
 471         query->info_buf_offset = sizeof(struct rndis_query_request);
 472         query->info_buflen = 0;
 473         query->dev_vc_handle = 0;
 474
 475         ret = rndis_filter_send_request(dev, request);
 476         if (ret != 0)
 477                 goto cleanup;
 478
 479         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 480         if (t == 0) {
 481                 ret = -ETIMEDOUT;
 482                 goto cleanup;
 483         }
 484
 485         /* Copy the response back */
 486         query_complete = &request->response_msg.msg.query_complete;
 487
 488         if (query_complete->info_buflen > inresult_size) {
 489                 ret = -1;
 490                 goto cleanup;
 491         }
 492
 493         memcpy(result,
 494                (void *)((unsigned long)query_complete +
 495                          query_complete->info_buf_offset),
 496                query_complete->info_buflen);
 497
 498         *result_size = query_complete->info_buflen;
 499
 500 cleanup:
 501         if (request)
 502                 put_rndis_request(dev, request);
 503
 504         return ret;
 505 }
 506
 507 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 508 {
 509         u32 size = ETH_ALEN;
 510
 511         return rndis_filter_query_device(dev,
 512                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 513                                       dev->hw_mac_adr, &size);
 514 }
 515
 516 #define NWADR_STR "NetworkAddress"
 517 #define NWADR_STRLEN 14
 518
 519 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 520 {
 521         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 522         struct rndis_device *rdev = nvdev->extension;
 523         struct net_device *ndev = nvdev->ndev;
 524         struct rndis_request *request;
 525         struct rndis_set_request *set;
 526         struct rndis_config_parameter_info *cpi;
 527         wchar_t *cfg_nwadr, *cfg_mac;
 528         struct rndis_set_complete *set_complete;
 529         char macstr[2*ETH_ALEN+1];
 530         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 531                 2*NWADR_STRLEN + 4*ETH_ALEN;
 532         int ret, t;
 533
 534         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 535                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 536         if (!request)
 537                 return -ENOMEM;
 538
 539         set = &request->request_msg.msg.set_req;
 540         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 541         set->info_buflen = extlen;
 542         set->info_buf_offset = sizeof(struct rndis_set_request);
 543         set->dev_vc_handle = 0;
 544
 545         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 546                 set->info_buf_offset);
 547         cpi->parameter_name_offset =
 548                 sizeof(struct rndis_config_parameter_info);
 549         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 550         cpi->parameter_name_length = 2*NWADR_STRLEN;
 551         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 552         cpi->parameter_value_offset =
 553                 cpi->parameter_name_offset + cpi->parameter_name_length;
 554         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 555         cpi->parameter_value_length = 4*ETH_ALEN;
 556
 557         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 558         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 559         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 560                               cfg_nwadr, NWADR_STRLEN);
 561         if (ret < 0)
 562                 goto cleanup;
 563         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 564         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 565                               cfg_mac, 2*ETH_ALEN);
 566         if (ret < 0)
 567                 goto cleanup;
 568
 569         ret = rndis_filter_send_request(rdev, request);
 570         if (ret != 0)
 571                 goto cleanup;
 572
 573         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 574         if (t == 0) {
 575                 netdev_err(ndev, "timeout before we got a set response...\n");
 576                 /*
 577                  * can't put_rndis_request, since we may still receive a
 578                  * send-completion.
 579                  */
 580                 return -EBUSY;
 581         } else {
 582                 set_complete = &request->response_msg.msg.set_complete;
 583                 if (set_complete->status != RNDIS_STATUS_SUCCESS)
 584                         ret = -EINVAL;
 585         }
 586
 587 cleanup:
 588         put_rndis_request(rdev, request);
 589         return ret;
 590 }
 591
 592
 593 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 594 {
 595         u32 size = sizeof(u32);
 596         u32 link_status;
 597         int ret;
 598
 599         ret = rndis_filter_query_device(dev,
 600                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 601                                       &link_status, &size);
 602         dev->link_state = (link_status != 0) ? true : false;
 603
 604         return ret;
 605 }
 606
 607 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 608 {
 609         struct rndis_request *request;
 610         struct rndis_set_request *set;
 611         struct rndis_set_complete *set_complete;
 612         u32 status;
 613         int ret, t;
 614         struct net_device *ndev;
 615
 616         ndev = dev->net_dev->ndev;
 617
 618         request = get_rndis_request(dev, RNDIS_MSG_SET,
 619                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 620                         sizeof(u32));
 621         if (!request) {
 622                 ret = -ENOMEM;
 623                 goto cleanup;
 624         }
 625
 626         /* Setup the rndis set */
 627         set = &request->request_msg.msg.set_req;
 628         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 629         set->info_buflen = sizeof(u32);
 630         set->info_buf_offset = sizeof(struct rndis_set_request);
 631
 632         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 633                &new_filter, sizeof(u32));
 634
 635         ret = rndis_filter_send_request(dev, request);
 636         if (ret != 0)
 637                 goto cleanup;
 638
 639         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 640
 641         if (t == 0) {
 642                 netdev_err(ndev,
 643                         "timeout before we got a set response...\n");
 644                 /*
 645                  * We can't deallocate the request since we may still receive a
 646                  * send completion for it.
 647                  */
 648                 goto exit;
 649         } else {
 650                 set_complete = &request->response_msg.msg.set_complete;
 651                 status = set_complete->status;
 652         }
 653
 654 cleanup:
 655         if (request)
 656                 put_rndis_request(dev, request);
 657 exit:
 658         return ret;
 659 }
 660
 661
 662 static int rndis_filter_init_device(struct rndis_device *dev)
 663 {
 664         struct rndis_request *request;
 665         struct rndis_initialize_request *init;
 666         struct rndis_initialize_complete *init_complete;
 667         u32 status;
 668         int ret, t;
 669
 670         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 671                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 672         if (!request) {
 673                 ret = -ENOMEM;
 674                 goto cleanup;
 675         }
 676
 677         /* Setup the rndis set */
 678         init = &request->request_msg.msg.init_req;
 679         init->major_ver = RNDIS_MAJOR_VERSION;
 680         init->minor_ver = RNDIS_MINOR_VERSION;
 681         /* FIXME: Use 1536 - rounded ethernet frame size */
 682         init->max_xfer_size = 2048;
 683
 684         dev->state = RNDIS_DEV_INITIALIZING;
 685
 686         ret = rndis_filter_send_request(dev, request);
 687         if (ret != 0) {
 688                 dev->state = RNDIS_DEV_UNINITIALIZED;
 689                 goto cleanup;
 690         }
 691
 692
 693         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 694
 695         if (t == 0) {
 696                 ret = -ETIMEDOUT;
 697                 goto cleanup;
 698         }
 699
 700         init_complete = &request->response_msg.msg.init_complete;
 701         status = init_complete->status;
 702         if (status == RNDIS_STATUS_SUCCESS) {
 703                 dev->state = RNDIS_DEV_INITIALIZED;
 704                 ret = 0;
 705         } else {
 706                 dev->state = RNDIS_DEV_UNINITIALIZED;
 707                 ret = -EINVAL;
 708         }
 709
 710 cleanup:
 711         if (request)
 712                 put_rndis_request(dev, request);
 713
 714         return ret;
 715 }
 716
 717 static void rndis_filter_halt_device(struct rndis_device *dev)
 718 {
 719         struct rndis_request *request;
 720         struct rndis_halt_request *halt;
 721
 722         /* Attempt to do a rndis device halt */
 723         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 724                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 725         if (!request)
 726                 goto cleanup;
 727
 728         /* Setup the rndis set */
 729         halt = &request->request_msg.msg.halt_req;
 730         halt->req_id = atomic_inc_return(&dev->new_req_id);
 731
 732         /* Ignore return since this msg is optional. */
 733         rndis_filter_send_request(dev, request);
 734
 735         dev->state = RNDIS_DEV_UNINITIALIZED;
 736
 737 cleanup:
 738         if (request)
 739                 put_rndis_request(dev, request);
 740         return;
 741 }
 742
 743 static int rndis_filter_open_device(struct rndis_device *dev)
 744 {
 745         int ret;
 746
 747         if (dev->state != RNDIS_DEV_INITIALIZED)
 748                 return 0;
 749
 750         ret = rndis_filter_set_packet_filter(dev,
 751                                          NDIS_PACKET_TYPE_BROADCAST |
 752                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 753                                          NDIS_PACKET_TYPE_DIRECTED);
 754         if (ret == 0)
 755                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 756
 757         return ret;
 758 }
 759
 760 static int rndis_filter_close_device(struct rndis_device *dev)
 761 {
 762         int ret;
 763
 764         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 765                 return 0;
 766
 767         ret = rndis_filter_set_packet_filter(dev, 0);
 768         if (ret == 0)
 769                 dev->state = RNDIS_DEV_INITIALIZED;
 770
 771         return ret;
 772 }
 773
 774 int rndis_filter_device_add(struct hv_device *dev,
 775                                   void *additional_info)
 776 {
 777         int ret;
 778         struct netvsc_device *net_device;
 779         struct rndis_device *rndis_device;
 780         struct netvsc_device_info *device_info = additional_info;
 781
 782         rndis_device = get_rndis_device();
 783         if (!rndis_device)
 784                 return -ENODEV;
 785
 786         /*
 787          * Let the inner driver handle this first to create the netvsc channel
 788          * NOTE! Once the channel is created, we may get a receive callback
 789          * (RndisFilterOnReceive()) before this call is completed
 790          */
 791         ret = netvsc_device_add(dev, additional_info);
 792         if (ret != 0) {
 793                 kfree(rndis_device);
 794                 return ret;
 795         }
 796
 797
 798         /* Initialize the rndis device */
 799         net_device = hv_get_drvdata(dev);
 800
 801         net_device->extension = rndis_device;
 802         rndis_device->net_dev = net_device;
 803
 804         /* Send the rndis initialization message */
 805         ret = rndis_filter_init_device(rndis_device);
 806         if (ret != 0) {
 807                 rndis_filter_device_remove(dev);
 808                 return ret;
 809         }
 810
 811         /* Get the mac address */
 812         ret = rndis_filter_query_device_mac(rndis_device);
 813         if (ret != 0) {
 814                 rndis_filter_device_remove(dev);
 815                 return ret;
 816         }
 817
 818         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 819
 820         rndis_filter_query_device_link_status(rndis_device);
 821
 822         device_info->link_state = rndis_device->link_state;
 823
 824         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 825                  rndis_device->hw_mac_adr,
 826                  device_info->link_state ? "down" : "up");
 827
 828         return ret;
 829 }
 830
 831 void rndis_filter_device_remove(struct hv_device *dev)
 832 {
 833         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 834         struct rndis_device *rndis_dev = net_dev->extension;
 835
 836         /* Halt and release the rndis device */
 837         rndis_filter_halt_device(rndis_dev);
 838
 839         kfree(rndis_dev);
 840         net_dev->extension = NULL;
 841
 842         netvsc_device_remove(dev);
 843 }
 844
 845
 846 int rndis_filter_open(struct hv_device *dev)
 847 {
 848         struct netvsc_device *net_device = hv_get_drvdata(dev);
 849
 850         if (!net_device)
 851                 return -EINVAL;
 852
 853         return rndis_filter_open_device(net_device->extension);
 854 }
 855
 856 int rndis_filter_close(struct hv_device *dev)
 857 {
 858         struct netvsc_device *nvdev = hv_get_drvdata(dev);
 859
 860         if (!nvdev)
 861                 return -EINVAL;
 862
 863         return rndis_filter_close_device(nvdev->extension);
 864 }
 865
 866 int rndis_filter_send(struct hv_device *dev,
 867                              struct hv_netvsc_packet *pkt)
 868 {
 869         int ret;
 870         struct rndis_filter_packet *filter_pkt;
 871         struct rndis_message *rndis_msg;
 872         struct rndis_packet *rndis_pkt;
 873         u32 rndis_msg_size;
 874         bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
 875
 876         /* Add the rndis header */
 877         filter_pkt = (struct rndis_filter_packet *)pkt->extension;
 878
 879         rndis_msg = &filter_pkt->msg;
 880         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 881         if (isvlan)
 882                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 883
 884         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 885         rndis_msg->msg_len = pkt->total_data_buflen +
 886                                       rndis_msg_size;
 887
 888         rndis_pkt = &rndis_msg->msg.pkt;
 889         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 890         if (isvlan)
 891                 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
 892         rndis_pkt->data_len = pkt->total_data_buflen;
 893
 894         if (isvlan) {
 895                 struct rndis_per_packet_info *ppi;
 896                 struct ndis_pkt_8021q_info *vlan;
 897
 898                 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 899                 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
 900
 901                 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
 902                         rndis_pkt->per_pkt_info_offset);
 903                 ppi->size = NDIS_VLAN_PPI_SIZE;
 904                 ppi->type = IEEE_8021Q_INFO;
 905                 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 906
 907                 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
 908                         ppi->ppi_offset);
 909                 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
 910                 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 911         }
 912
 913         pkt->is_data_pkt = true;
 914         pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
 915         pkt->page_buf[0].offset =
 916                         (unsigned long)rndis_msg & (PAGE_SIZE-1);
 917         pkt->page_buf[0].len = rndis_msg_size;
 918
 919         /* Add one page_buf if the rndis msg goes beyond page boundary */
 920         if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
 921                 int i;
 922                 for (i = pkt->page_buf_cnt; i > 1; i--)
 923                         pkt->page_buf[i] = pkt->page_buf[i-1];
 924                 pkt->page_buf_cnt++;
 925                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 926                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 927                         rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 928                 pkt->page_buf[1].offset = 0;
 929                 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
 930         }
 931
 932         /* Save the packet send completion and context */
 933         filter_pkt->completion = pkt->completion.send.send_completion;
 934         filter_pkt->completion_ctx =
 935                                 pkt->completion.send.send_completion_ctx;
 936
 937         /* Use ours */
 938         pkt->completion.send.send_completion = rndis_filter_send_completion;
 939         pkt->completion.send.send_completion_ctx = filter_pkt;
 940
 941         ret = netvsc_send(dev, pkt);
 942         if (ret != 0) {
 943                 /*
 944                  * Reset the completion to originals to allow retries from
 945                  * above
 946                  */
 947                 pkt->completion.send.send_completion =
 948                                 filter_pkt->completion;
 949                 pkt->completion.send.send_completion_ctx =
 950                                 filter_pkt->completion_ctx;
 951         }
 952
 953         return ret;
 954 }
 955
 956 static void rndis_filter_send_completion(void *ctx)
 957 {
 958         struct rndis_filter_packet *filter_pkt = ctx;
 959
 960         /* Pass it back to the original handler */
 961         filter_pkt->completion(filter_pkt->completion_ctx);
 962 }
 963
 964
 965 static void rndis_filter_send_request_completion(void *ctx)
 966 {
 967         /* Noop */
 968 }