Pileus Git - ~andy/linux/blob - 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 #define RNDIS_EXT_LEN 100
  36 struct rndis_request {
  37         struct list_head list_ent;
  38         struct completion  wait_event;
  39
  40         struct rndis_message response_msg;
  41         /*
  42          * The buffer for extended info after the RNDIS response message. It's
  43          * referenced based on the data offset in the RNDIS message. Its size
  44          * is enough for current needs, and should be sufficient for the near
  45          * future.
  46          */
  47         u8 response_ext[RNDIS_EXT_LEN];
  48
  49         /* Simplify allocation by having a netvsc packet inline */
  50         struct hv_netvsc_packet pkt;
  51         /* Set 2 pages for rndis requests crossing page boundary */
  52         struct hv_page_buffer buf[2];
  53
  54         struct rndis_message request_msg;
  55         /*
  56          * The buffer for the extended info after the RNDIS request message.
  57          * It is referenced and sized in a similar way as response_ext.
  58          */
  59         u8 request_ext[RNDIS_EXT_LEN];
  60 };
  61
  62 static void rndis_filter_send_completion(void *ctx);
  63
  64 static void rndis_filter_send_request_completion(void *ctx);
  65
  66
  67
  68 static struct rndis_device *get_rndis_device(void)
  69 {
  70         struct rndis_device *device;
  71
  72         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  73         if (!device)
  74                 return NULL;
  75
  76         spin_lock_init(&device->request_lock);
  77
  78         INIT_LIST_HEAD(&device->req_list);
  79
  80         device->state = RNDIS_DEV_UNINITIALIZED;
  81
  82         return device;
  83 }
  84
  85 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  86                                              u32 msg_type,
  87                                              u32 msg_len)
  88 {
  89         struct rndis_request *request;
  90         struct rndis_message *rndis_msg;
  91         struct rndis_set_request *set;
  92         unsigned long flags;
  93
  94         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  95         if (!request)
  96                 return NULL;
  97
  98         init_completion(&request->wait_event);
  99
 100         rndis_msg = &request->request_msg;
 101         rndis_msg->ndis_msg_type = msg_type;
 102         rndis_msg->msg_len = msg_len;
 103
 104         /*
 105          * Set the request id. This field is always after the rndis header for
 106          * request/response packet types so we just used the SetRequest as a
 107          * template
 108          */
 109         set = &rndis_msg->msg.set_req;
 110         set->req_id = atomic_inc_return(&dev->new_req_id);
 111
 112         /* Add to the request list */
 113         spin_lock_irqsave(&dev->request_lock, flags);
 114         list_add_tail(&request->list_ent, &dev->req_list);
 115         spin_unlock_irqrestore(&dev->request_lock, flags);
 116
 117         return request;
 118 }
 119
 120 static void put_rndis_request(struct rndis_device *dev,
 121                             struct rndis_request *req)
 122 {
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&dev->request_lock, flags);
 126         list_del(&req->list_ent);
 127         spin_unlock_irqrestore(&dev->request_lock, flags);
 128
 129         kfree(req);
 130 }
 131
 132 static void dump_rndis_message(struct hv_device *hv_dev,
 133                         struct rndis_message *rndis_msg)
 134 {
 135         struct net_device *netdev;
 136         struct netvsc_device *net_device;
 137
 138         net_device = hv_get_drvdata(hv_dev);
 139         netdev = net_device->ndev;
 140
 141         switch (rndis_msg->ndis_msg_type) {
 142         case RNDIS_MSG_PACKET:
 143                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 144                            "data offset %u data len %u, # oob %u, "
 145                            "oob offset %u, oob len %u, pkt offset %u, "
 146                            "pkt len %u\n",
 147                            rndis_msg->msg_len,
 148                            rndis_msg->msg.pkt.data_offset,
 149                            rndis_msg->msg.pkt.data_len,
 150                            rndis_msg->msg.pkt.num_oob_data_elements,
 151                            rndis_msg->msg.pkt.oob_data_offset,
 152                            rndis_msg->msg.pkt.oob_data_len,
 153                            rndis_msg->msg.pkt.per_pkt_info_offset,
 154                            rndis_msg->msg.pkt.per_pkt_info_len);
 155                 break;
 156
 157         case RNDIS_MSG_INIT_C:
 158                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 159                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 160                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 161                         "pkt aligned %u)\n",
 162                         rndis_msg->msg_len,
 163                         rndis_msg->msg.init_complete.req_id,
 164                         rndis_msg->msg.init_complete.status,
 165                         rndis_msg->msg.init_complete.major_ver,
 166                         rndis_msg->msg.init_complete.minor_ver,
 167                         rndis_msg->msg.init_complete.dev_flags,
 168                         rndis_msg->msg.init_complete.max_xfer_size,
 169                         rndis_msg->msg.init_complete.
 170                            max_pkt_per_msg,
 171                         rndis_msg->msg.init_complete.
 172                            pkt_alignment_factor);
 173                 break;
 174
 175         case RNDIS_MSG_QUERY_C:
 176                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 177                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 178                         "buf offset %u)\n",
 179                         rndis_msg->msg_len,
 180                         rndis_msg->msg.query_complete.req_id,
 181                         rndis_msg->msg.query_complete.status,
 182                         rndis_msg->msg.query_complete.
 183                            info_buflen,
 184                         rndis_msg->msg.query_complete.
 185                            info_buf_offset);
 186                 break;
 187
 188         case RNDIS_MSG_SET_C:
 189                 netdev_dbg(netdev,
 190                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 191                         rndis_msg->msg_len,
 192                         rndis_msg->msg.set_complete.req_id,
 193                         rndis_msg->msg.set_complete.status);
 194                 break;
 195
 196         case RNDIS_MSG_INDICATE:
 197                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 198                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 199                         rndis_msg->msg_len,
 200                         rndis_msg->msg.indicate_status.status,
 201                         rndis_msg->msg.indicate_status.status_buflen,
 202                         rndis_msg->msg.indicate_status.status_buf_offset);
 203                 break;
 204
 205         default:
 206                 netdev_dbg(netdev, "0x%x (len %u)\n",
 207                         rndis_msg->ndis_msg_type,
 208                         rndis_msg->msg_len);
 209                 break;
 210         }
 211 }
 212
 213 static int rndis_filter_send_request(struct rndis_device *dev,
 214                                   struct rndis_request *req)
 215 {
 216         int ret;
 217         struct hv_netvsc_packet *packet;
 218
 219         /* Setup the packet to send it */
 220         packet = &req->pkt;
 221
 222         packet->is_data_pkt = false;
 223         packet->total_data_buflen = req->request_msg.msg_len;
 224         packet->page_buf_cnt = 1;
 225
 226         packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
 227                                         PAGE_SHIFT;
 228         packet->page_buf[0].len = req->request_msg.msg_len;
 229         packet->page_buf[0].offset =
 230                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 231
 232         /* Add one page_buf when request_msg crossing page boundary */
 233         if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) {
 234                 packet->page_buf_cnt++;
 235                 packet->page_buf[0].len = PAGE_SIZE -
 236                         packet->page_buf[0].offset;
 237                 packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg
 238                         + packet->page_buf[0].len) >> PAGE_SHIFT;
 239                 packet->page_buf[1].offset = 0;
 240                 packet->page_buf[1].len = req->request_msg.msg_len -
 241                         packet->page_buf[0].len;
 242         }
 243
 244         packet->completion.send.send_completion_ctx = req;/* packet; */
 245         packet->completion.send.send_completion =
 246                 rndis_filter_send_request_completion;
 247         packet->completion.send.send_completion_tid = (unsigned long)dev;
 248
 249         ret = netvsc_send(dev->net_dev->dev, packet);
 250         return ret;
 251 }
 252
 253 static void rndis_filter_receive_response(struct rndis_device *dev,
 254                                        struct rndis_message *resp)
 255 {
 256         struct rndis_request *request = NULL;
 257         bool found = false;
 258         unsigned long flags;
 259         struct net_device *ndev;
 260
 261         ndev = dev->net_dev->ndev;
 262
 263         spin_lock_irqsave(&dev->request_lock, flags);
 264         list_for_each_entry(request, &dev->req_list, list_ent) {
 265                 /*
 266                  * All request/response message contains RequestId as the 1st
 267                  * field
 268                  */
 269                 if (request->request_msg.msg.init_req.req_id
 270                     == resp->msg.init_complete.req_id) {
 271                         found = true;
 272                         break;
 273                 }
 274         }
 275         spin_unlock_irqrestore(&dev->request_lock, flags);
 276
 277         if (found) {
 278                 if (resp->msg_len <=
 279                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 280                         memcpy(&request->response_msg, resp,
 281                                resp->msg_len);
 282                 } else {
 283                         netdev_err(ndev,
 284                                 "rndis response buffer overflow "
 285                                 "detected (size %u max %zu)\n",
 286                                 resp->msg_len,
 287                                 sizeof(struct rndis_filter_packet));
 288
 289                         if (resp->ndis_msg_type ==
 290                             RNDIS_MSG_RESET_C) {
 291                                 /* does not have a request id field */
 292                                 request->response_msg.msg.reset_complete.
 293                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 294                         } else {
 295                                 request->response_msg.msg.
 296                                 init_complete.status =
 297                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 298                         }
 299                 }
 300
 301                 complete(&request->wait_event);
 302         } else {
 303                 netdev_err(ndev,
 304                         "no rndis request found for this response "
 305                         "(id 0x%x res type 0x%x)\n",
 306                         resp->msg.init_complete.req_id,
 307                         resp->ndis_msg_type);
 308         }
 309 }
 310
 311 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 312                                              struct rndis_message *resp)
 313 {
 314         struct rndis_indicate_status *indicate =
 315                         &resp->msg.indicate_status;
 316
 317         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 318                 netvsc_linkstatus_callback(
 319                         dev->net_dev->dev, 1);
 320         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 321                 netvsc_linkstatus_callback(
 322                         dev->net_dev->dev, 0);
 323         } else {
 324                 /*
 325                  * TODO:
 326                  */
 327         }
 328 }
 329
 330 /*
 331  * Get the Per-Packet-Info with the specified type
 332  * return NULL if not found.
 333  */
 334 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 335 {
 336         struct rndis_per_packet_info *ppi;
 337         int len;
 338
 339         if (rpkt->per_pkt_info_offset == 0)
 340                 return NULL;
 341
 342         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 343                 rpkt->per_pkt_info_offset);
 344         len = rpkt->per_pkt_info_len;
 345
 346         while (len > 0) {
 347                 if (ppi->type == type)
 348                         return (void *)((ulong)ppi + ppi->ppi_offset);
 349                 len -= ppi->size;
 350                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 351         }
 352
 353         return NULL;
 354 }
 355
 356 static void rndis_filter_receive_data(struct rndis_device *dev,
 357                                    struct rndis_message *msg,
 358                                    struct hv_netvsc_packet *pkt)
 359 {
 360         struct rndis_packet *rndis_pkt;
 361         u32 data_offset;
 362         struct ndis_pkt_8021q_info *vlan;
 363
 364         rndis_pkt = &msg->msg.pkt;
 365
 366         /* Remove the rndis header and pass it back up the stack */
 367         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 368
 369         pkt->total_data_buflen -= data_offset;
 370
 371         /*
 372          * Make sure we got a valid RNDIS message, now total_data_buflen
 373          * should be the data packet size plus the trailer padding size
 374          */
 375         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 376                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 377                            "overflow detected (got %u, min %u)"
 378                            "...dropping this message!\n",
 379                            pkt->total_data_buflen, rndis_pkt->data_len);
 380                 return;
 381         }
 382
 383         /*
 384          * Remove the rndis trailer padding from rndis packet message
 385          * rndis_pkt->data_len tell us the real data length, we only copy
 386          * the data packet to the stack, without the rndis trailer padding
 387          */
 388         pkt->total_data_buflen = rndis_pkt->data_len;
 389         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 390
 391         pkt->is_data_pkt = true;
 392
 393         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 394         if (vlan) {
 395                 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
 396                         (vlan->pri << VLAN_PRIO_SHIFT);
 397         } else {
 398                 pkt->vlan_tci = 0;
 399         }
 400
 401         netvsc_recv_callback(dev->net_dev->dev, pkt);
 402 }
 403
 404 int rndis_filter_receive(struct hv_device *dev,
 405                                 struct hv_netvsc_packet *pkt)
 406 {
 407         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 408         struct rndis_device *rndis_dev;
 409         struct rndis_message *rndis_msg;
 410         struct net_device *ndev;
 411         int ret = 0;
 412
 413         if (!net_dev) {
 414                 ret = -EINVAL;
 415                 goto exit;
 416         }
 417
 418         ndev = net_dev->ndev;
 419
 420         /* Make sure the rndis device state is initialized */
 421         if (!net_dev->extension) {
 422                 netdev_err(ndev, "got rndis message but no rndis device - "
 423                           "dropping this message!\n");
 424                 ret = -ENODEV;
 425                 goto exit;
 426         }
 427
 428         rndis_dev = (struct rndis_device *)net_dev->extension;
 429         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 430                 netdev_err(ndev, "got rndis message but rndis device "
 431                            "uninitialized...dropping this message!\n");
 432                 ret = -ENODEV;
 433                 goto exit;
 434         }
 435
 436         rndis_msg = pkt->data;
 437
 438         dump_rndis_message(dev, rndis_msg);
 439
 440         switch (rndis_msg->ndis_msg_type) {
 441         case RNDIS_MSG_PACKET:
 442                 /* data msg */
 443                 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
 444                 break;
 445
 446         case RNDIS_MSG_INIT_C:
 447         case RNDIS_MSG_QUERY_C:
 448         case RNDIS_MSG_SET_C:
 449                 /* completion msgs */
 450                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 451                 break;
 452
 453         case RNDIS_MSG_INDICATE:
 454                 /* notification msgs */
 455                 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
 456                 break;
 457         default:
 458                 netdev_err(ndev,
 459                         "unhandled rndis message (type %u len %u)\n",
 460                            rndis_msg->ndis_msg_type,
 461                            rndis_msg->msg_len);
 462                 break;
 463         }
 464
 465 exit:
 466         if (ret != 0)
 467                 pkt->status = NVSP_STAT_FAIL;
 468
 469         return ret;
 470 }
 471
 472 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 473                                   void *result, u32 *result_size)
 474 {
 475         struct rndis_request *request;
 476         u32 inresult_size = *result_size;
 477         struct rndis_query_request *query;
 478         struct rndis_query_complete *query_complete;
 479         int ret = 0;
 480         int t;
 481
 482         if (!result)
 483                 return -EINVAL;
 484
 485         *result_size = 0;
 486         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 487                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 488         if (!request) {
 489                 ret = -ENOMEM;
 490                 goto cleanup;
 491         }
 492
 493         /* Setup the rndis query */
 494         query = &request->request_msg.msg.query_req;
 495         query->oid = oid;
 496         query->info_buf_offset = sizeof(struct rndis_query_request);
 497         query->info_buflen = 0;
 498         query->dev_vc_handle = 0;
 499
 500         ret = rndis_filter_send_request(dev, request);
 501         if (ret != 0)
 502                 goto cleanup;
 503
 504         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 505         if (t == 0) {
 506                 ret = -ETIMEDOUT;
 507                 goto cleanup;
 508         }
 509
 510         /* Copy the response back */
 511         query_complete = &request->response_msg.msg.query_complete;
 512
 513         if (query_complete->info_buflen > inresult_size) {
 514                 ret = -1;
 515                 goto cleanup;
 516         }
 517
 518         memcpy(result,
 519                (void *)((unsigned long)query_complete +
 520                          query_complete->info_buf_offset),
 521                query_complete->info_buflen);
 522
 523         *result_size = query_complete->info_buflen;
 524
 525 cleanup:
 526         if (request)
 527                 put_rndis_request(dev, request);
 528
 529         return ret;
 530 }
 531
 532 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 533 {
 534         u32 size = ETH_ALEN;
 535
 536         return rndis_filter_query_device(dev,
 537                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 538                                       dev->hw_mac_adr, &size);
 539 }
 540
 541 #define NWADR_STR "NetworkAddress"
 542 #define NWADR_STRLEN 14
 543
 544 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 545 {
 546         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 547         struct rndis_device *rdev = nvdev->extension;
 548         struct net_device *ndev = nvdev->ndev;
 549         struct rndis_request *request;
 550         struct rndis_set_request *set;
 551         struct rndis_config_parameter_info *cpi;
 552         wchar_t *cfg_nwadr, *cfg_mac;
 553         struct rndis_set_complete *set_complete;
 554         char macstr[2*ETH_ALEN+1];
 555         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 556                 2*NWADR_STRLEN + 4*ETH_ALEN;
 557         int ret, t;
 558
 559         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 560                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 561         if (!request)
 562                 return -ENOMEM;
 563
 564         set = &request->request_msg.msg.set_req;
 565         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 566         set->info_buflen = extlen;
 567         set->info_buf_offset = sizeof(struct rndis_set_request);
 568         set->dev_vc_handle = 0;
 569
 570         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 571                 set->info_buf_offset);
 572         cpi->parameter_name_offset =
 573                 sizeof(struct rndis_config_parameter_info);
 574         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 575         cpi->parameter_name_length = 2*NWADR_STRLEN;
 576         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 577         cpi->parameter_value_offset =
 578                 cpi->parameter_name_offset + cpi->parameter_name_length;
 579         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 580         cpi->parameter_value_length = 4*ETH_ALEN;
 581
 582         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 583         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 584         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 585                               cfg_nwadr, NWADR_STRLEN);
 586         if (ret < 0)
 587                 goto cleanup;
 588         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 589         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 590                               cfg_mac, 2*ETH_ALEN);
 591         if (ret < 0)
 592                 goto cleanup;
 593
 594         ret = rndis_filter_send_request(rdev, request);
 595         if (ret != 0)
 596                 goto cleanup;
 597
 598         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 599         if (t == 0) {
 600                 netdev_err(ndev, "timeout before we got a set response...\n");
 601                 /*
 602                  * can't put_rndis_request, since we may still receive a
 603                  * send-completion.
 604                  */
 605                 return -EBUSY;
 606         } else {
 607                 set_complete = &request->response_msg.msg.set_complete;
 608                 if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 609                         netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
 610                                    set_complete->status);
 611                         ret = -EINVAL;
 612                 }
 613         }
 614
 615 cleanup:
 616         put_rndis_request(rdev, request);
 617         return ret;
 618 }
 619
 620
 621 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 622 {
 623         u32 size = sizeof(u32);
 624         u32 link_status;
 625         int ret;
 626
 627         ret = rndis_filter_query_device(dev,
 628                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 629                                       &link_status, &size);
 630         dev->link_state = (link_status != 0) ? true : false;
 631
 632         return ret;
 633 }
 634
 635 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 636 {
 637         struct rndis_request *request;
 638         struct rndis_set_request *set;
 639         struct rndis_set_complete *set_complete;
 640         u32 status;
 641         int ret, t;
 642         struct net_device *ndev;
 643
 644         ndev = dev->net_dev->ndev;
 645
 646         request = get_rndis_request(dev, RNDIS_MSG_SET,
 647                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 648                         sizeof(u32));
 649         if (!request) {
 650                 ret = -ENOMEM;
 651                 goto cleanup;
 652         }
 653
 654         /* Setup the rndis set */
 655         set = &request->request_msg.msg.set_req;
 656         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 657         set->info_buflen = sizeof(u32);
 658         set->info_buf_offset = sizeof(struct rndis_set_request);
 659
 660         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 661                &new_filter, sizeof(u32));
 662
 663         ret = rndis_filter_send_request(dev, request);
 664         if (ret != 0)
 665                 goto cleanup;
 666
 667         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 668
 669         if (t == 0) {
 670                 netdev_err(ndev,
 671                         "timeout before we got a set response...\n");
 672                 ret = -ETIMEDOUT;
 673                 /*
 674                  * We can't deallocate the request since we may still receive a
 675                  * send completion for it.
 676                  */
 677                 goto exit;
 678         } else {
 679                 set_complete = &request->response_msg.msg.set_complete;
 680                 status = set_complete->status;
 681         }
 682
 683 cleanup:
 684         if (request)
 685                 put_rndis_request(dev, request);
 686 exit:
 687         return ret;
 688 }
 689
 690
 691 static int rndis_filter_init_device(struct rndis_device *dev)
 692 {
 693         struct rndis_request *request;
 694         struct rndis_initialize_request *init;
 695         struct rndis_initialize_complete *init_complete;
 696         u32 status;
 697         int ret, t;
 698
 699         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 700                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 701         if (!request) {
 702                 ret = -ENOMEM;
 703                 goto cleanup;
 704         }
 705
 706         /* Setup the rndis set */
 707         init = &request->request_msg.msg.init_req;
 708         init->major_ver = RNDIS_MAJOR_VERSION;
 709         init->minor_ver = RNDIS_MINOR_VERSION;
 710         init->max_xfer_size = 0x4000;
 711
 712         dev->state = RNDIS_DEV_INITIALIZING;
 713
 714         ret = rndis_filter_send_request(dev, request);
 715         if (ret != 0) {
 716                 dev->state = RNDIS_DEV_UNINITIALIZED;
 717                 goto cleanup;
 718         }
 719
 720
 721         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 722
 723         if (t == 0) {
 724                 ret = -ETIMEDOUT;
 725                 goto cleanup;
 726         }
 727
 728         init_complete = &request->response_msg.msg.init_complete;
 729         status = init_complete->status;
 730         if (status == RNDIS_STATUS_SUCCESS) {
 731                 dev->state = RNDIS_DEV_INITIALIZED;
 732                 ret = 0;
 733         } else {
 734                 dev->state = RNDIS_DEV_UNINITIALIZED;
 735                 ret = -EINVAL;
 736         }
 737
 738 cleanup:
 739         if (request)
 740                 put_rndis_request(dev, request);
 741
 742         return ret;
 743 }
 744
 745 static void rndis_filter_halt_device(struct rndis_device *dev)
 746 {
 747         struct rndis_request *request;
 748         struct rndis_halt_request *halt;
 749         struct netvsc_device *nvdev = dev->net_dev;
 750         struct hv_device *hdev = nvdev->dev;
 751         ulong flags;
 752
 753         /* Attempt to do a rndis device halt */
 754         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 755                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 756         if (!request)
 757                 goto cleanup;
 758
 759         /* Setup the rndis set */
 760         halt = &request->request_msg.msg.halt_req;
 761         halt->req_id = atomic_inc_return(&dev->new_req_id);
 762
 763         /* Ignore return since this msg is optional. */
 764         rndis_filter_send_request(dev, request);
 765
 766         dev->state = RNDIS_DEV_UNINITIALIZED;
 767
 768 cleanup:
 769         spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
 770         nvdev->destroy = true;
 771         spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
 772
 773         /* Wait for all send completions */
 774         wait_event(nvdev->wait_drain,
 775                 atomic_read(&nvdev->num_outstanding_sends) == 0);
 776
 777         if (request)
 778                 put_rndis_request(dev, request);
 779         return;
 780 }
 781
 782 static int rndis_filter_open_device(struct rndis_device *dev)
 783 {
 784         int ret;
 785
 786         if (dev->state != RNDIS_DEV_INITIALIZED)
 787                 return 0;
 788
 789         ret = rndis_filter_set_packet_filter(dev,
 790                                          NDIS_PACKET_TYPE_BROADCAST |
 791                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 792                                          NDIS_PACKET_TYPE_DIRECTED);
 793         if (ret == 0)
 794                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 795
 796         return ret;
 797 }
 798
 799 static int rndis_filter_close_device(struct rndis_device *dev)
 800 {
 801         int ret;
 802
 803         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 804                 return 0;
 805
 806         ret = rndis_filter_set_packet_filter(dev, 0);
 807         if (ret == 0)
 808                 dev->state = RNDIS_DEV_INITIALIZED;
 809
 810         return ret;
 811 }
 812
 813 int rndis_filter_device_add(struct hv_device *dev,
 814                                   void *additional_info)
 815 {
 816         int ret;
 817         struct netvsc_device *net_device;
 818         struct rndis_device *rndis_device;
 819         struct netvsc_device_info *device_info = additional_info;
 820
 821         rndis_device = get_rndis_device();
 822         if (!rndis_device)
 823                 return -ENODEV;
 824
 825         /*
 826          * Let the inner driver handle this first to create the netvsc channel
 827          * NOTE! Once the channel is created, we may get a receive callback
 828          * (RndisFilterOnReceive()) before this call is completed
 829          */
 830         ret = netvsc_device_add(dev, additional_info);
 831         if (ret != 0) {
 832                 kfree(rndis_device);
 833                 return ret;
 834         }
 835
 836
 837         /* Initialize the rndis device */
 838         net_device = hv_get_drvdata(dev);
 839
 840         net_device->extension = rndis_device;
 841         rndis_device->net_dev = net_device;
 842
 843         /* Send the rndis initialization message */
 844         ret = rndis_filter_init_device(rndis_device);
 845         if (ret != 0) {
 846                 rndis_filter_device_remove(dev);
 847                 return ret;
 848         }
 849
 850         /* Get the mac address */
 851         ret = rndis_filter_query_device_mac(rndis_device);
 852         if (ret != 0) {
 853                 rndis_filter_device_remove(dev);
 854                 return ret;
 855         }
 856
 857         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 858
 859         rndis_filter_query_device_link_status(rndis_device);
 860
 861         device_info->link_state = rndis_device->link_state;
 862
 863         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 864                  rndis_device->hw_mac_adr,
 865                  device_info->link_state ? "down" : "up");
 866
 867         return ret;
 868 }
 869
 870 void rndis_filter_device_remove(struct hv_device *dev)
 871 {
 872         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 873         struct rndis_device *rndis_dev = net_dev->extension;
 874
 875         /* Halt and release the rndis device */
 876         rndis_filter_halt_device(rndis_dev);
 877
 878         kfree(rndis_dev);
 879         net_dev->extension = NULL;
 880
 881         netvsc_device_remove(dev);
 882 }
 883
 884
 885 int rndis_filter_open(struct hv_device *dev)
 886 {
 887         struct netvsc_device *net_device = hv_get_drvdata(dev);
 888
 889         if (!net_device)
 890                 return -EINVAL;
 891
 892         return rndis_filter_open_device(net_device->extension);
 893 }
 894
 895 int rndis_filter_close(struct hv_device *dev)
 896 {
 897         struct netvsc_device *nvdev = hv_get_drvdata(dev);
 898
 899         if (!nvdev)
 900                 return -EINVAL;
 901
 902         return rndis_filter_close_device(nvdev->extension);
 903 }
 904
 905 int rndis_filter_send(struct hv_device *dev,
 906                              struct hv_netvsc_packet *pkt)
 907 {
 908         int ret;
 909         struct rndis_filter_packet *filter_pkt;
 910         struct rndis_message *rndis_msg;
 911         struct rndis_packet *rndis_pkt;
 912         u32 rndis_msg_size;
 913         bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
 914
 915         /* Add the rndis header */
 916         filter_pkt = (struct rndis_filter_packet *)pkt->extension;
 917
 918         rndis_msg = &filter_pkt->msg;
 919         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 920         if (isvlan)
 921                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 922
 923         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 924         rndis_msg->msg_len = pkt->total_data_buflen +
 925                                       rndis_msg_size;
 926
 927         rndis_pkt = &rndis_msg->msg.pkt;
 928         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 929         if (isvlan)
 930                 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
 931         rndis_pkt->data_len = pkt->total_data_buflen;
 932
 933         if (isvlan) {
 934                 struct rndis_per_packet_info *ppi;
 935                 struct ndis_pkt_8021q_info *vlan;
 936
 937                 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 938                 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
 939
 940                 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
 941                         rndis_pkt->per_pkt_info_offset);
 942                 ppi->size = NDIS_VLAN_PPI_SIZE;
 943                 ppi->type = IEEE_8021Q_INFO;
 944                 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 945
 946                 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
 947                         ppi->ppi_offset);
 948                 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
 949                 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 950         }
 951
 952         pkt->is_data_pkt = true;
 953         pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
 954         pkt->page_buf[0].offset =
 955                         (unsigned long)rndis_msg & (PAGE_SIZE-1);
 956         pkt->page_buf[0].len = rndis_msg_size;
 957
 958         /* Add one page_buf if the rndis msg goes beyond page boundary */
 959         if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
 960                 int i;
 961                 for (i = pkt->page_buf_cnt; i > 1; i--)
 962                         pkt->page_buf[i] = pkt->page_buf[i-1];
 963                 pkt->page_buf_cnt++;
 964                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 965                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 966                         rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 967                 pkt->page_buf[1].offset = 0;
 968                 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
 969         }
 970
 971         /* Save the packet send completion and context */
 972         filter_pkt->completion = pkt->completion.send.send_completion;
 973         filter_pkt->completion_ctx =
 974                                 pkt->completion.send.send_completion_ctx;
 975
 976         /* Use ours */
 977         pkt->completion.send.send_completion = rndis_filter_send_completion;
 978         pkt->completion.send.send_completion_ctx = filter_pkt;
 979
 980         ret = netvsc_send(dev, pkt);
 981         if (ret != 0) {
 982                 /*
 983                  * Reset the completion to originals to allow retries from
 984                  * above
 985                  */
 986                 pkt->completion.send.send_completion =
 987                                 filter_pkt->completion;
 988                 pkt->completion.send.send_completion_ctx =
 989                                 filter_pkt->completion_ctx;
 990         }
 991
 992         return ret;
 993 }
 994
 995 static void rndis_filter_send_completion(void *ctx)
 996 {
 997         struct rndis_filter_packet *filter_pkt = ctx;
 998
 999         /* Pass it back to the original handler */
1000         filter_pkt->completion(filter_pkt->completion_ctx);
1001 }
1002
1003
1004 static void rndis_filter_send_request_completion(void *ctx)
1005 {
1006         /* Noop */
1007 }