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, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Authors:
  17  *   Haiyang Zhang <haiyangz@microsoft.com>
  18  *   Hank Janssen  <hjanssen@microsoft.com>
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/wait.h>
  23 #include <linux/highmem.h>
  24 #include <linux/slab.h>
  25 #include <linux/io.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/if_vlan.h>
  29 #include <linux/nls.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/rtnetlink.h>
  32
  33 #include "hyperv_net.h"
  34
  35 static void rndis_set_multicast(struct work_struct *w);
  36
  37 #define RNDIS_EXT_LEN PAGE_SIZE
  38 struct rndis_request {
  39         struct list_head list_ent;
  40         struct completion  wait_event;
  41
  42         struct rndis_message response_msg;
  43         /*
  44          * The buffer for extended info after the RNDIS response message. It's
  45          * referenced based on the data offset in the RNDIS message. Its size
  46          * is enough for current needs, and should be sufficient for the near
  47          * future.
  48          */
  49         u8 response_ext[RNDIS_EXT_LEN];
  50
  51         /* Simplify allocation by having a netvsc packet inline */
  52         struct hv_netvsc_packet pkt;
  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 const u8 netvsc_hash_key[NETVSC_HASH_KEYLEN] = {
  63         0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
  64         0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
  65         0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
  66         0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
  67         0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
  68 };
  69
  70 static struct rndis_device *get_rndis_device(void)
  71 {
  72         struct rndis_device *device;
  73
  74         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  75         if (!device)
  76                 return NULL;
  77
  78         spin_lock_init(&device->request_lock);
  79
  80         INIT_LIST_HEAD(&device->req_list);
  81         INIT_WORK(&device->mcast_work, rndis_set_multicast);
  82
  83         device->state = RNDIS_DEV_UNINITIALIZED;
  84
  85         return device;
  86 }
  87
  88 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  89                                              u32 msg_type,
  90                                              u32 msg_len)
  91 {
  92         struct rndis_request *request;
  93         struct rndis_message *rndis_msg;
  94         struct rndis_set_request *set;
  95         unsigned long flags;
  96
  97         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  98         if (!request)
  99                 return NULL;
 100
 101         init_completion(&request->wait_event);
 102
 103         rndis_msg = &request->request_msg;
 104         rndis_msg->ndis_msg_type = msg_type;
 105         rndis_msg->msg_len = msg_len;
 106
 107         request->pkt.q_idx = 0;
 108
 109         /*
 110          * Set the request id. This field is always after the rndis header for
 111          * request/response packet types so we just used the SetRequest as a
 112          * template
 113          */
 114         set = &rndis_msg->msg.set_req;
 115         set->req_id = atomic_inc_return(&dev->new_req_id);
 116
 117         /* Add to the request list */
 118         spin_lock_irqsave(&dev->request_lock, flags);
 119         list_add_tail(&request->list_ent, &dev->req_list);
 120         spin_unlock_irqrestore(&dev->request_lock, flags);
 121
 122         return request;
 123 }
 124
 125 static void put_rndis_request(struct rndis_device *dev,
 126                             struct rndis_request *req)
 127 {
 128         unsigned long flags;
 129
 130         spin_lock_irqsave(&dev->request_lock, flags);
 131         list_del(&req->list_ent);
 132         spin_unlock_irqrestore(&dev->request_lock, flags);
 133
 134         kfree(req);
 135 }
 136
 137 static void dump_rndis_message(struct hv_device *hv_dev,
 138                                const struct rndis_message *rndis_msg)
 139 {
 140         struct net_device *netdev = hv_get_drvdata(hv_dev);
 141
 142         switch (rndis_msg->ndis_msg_type) {
 143         case RNDIS_MSG_PACKET:
 144                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 145                            "data offset %u data len %u, # oob %u, "
 146                            "oob offset %u, oob len %u, pkt offset %u, "
 147                            "pkt len %u\n",
 148                            rndis_msg->msg_len,
 149                            rndis_msg->msg.pkt.data_offset,
 150                            rndis_msg->msg.pkt.data_len,
 151                            rndis_msg->msg.pkt.num_oob_data_elements,
 152                            rndis_msg->msg.pkt.oob_data_offset,
 153                            rndis_msg->msg.pkt.oob_data_len,
 154                            rndis_msg->msg.pkt.per_pkt_info_offset,
 155                            rndis_msg->msg.pkt.per_pkt_info_len);
 156                 break;
 157
 158         case RNDIS_MSG_INIT_C:
 159                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 160                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 161                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 162                         "pkt aligned %u)\n",
 163                         rndis_msg->msg_len,
 164                         rndis_msg->msg.init_complete.req_id,
 165                         rndis_msg->msg.init_complete.status,
 166                         rndis_msg->msg.init_complete.major_ver,
 167                         rndis_msg->msg.init_complete.minor_ver,
 168                         rndis_msg->msg.init_complete.dev_flags,
 169                         rndis_msg->msg.init_complete.max_xfer_size,
 170                         rndis_msg->msg.init_complete.
 171                            max_pkt_per_msg,
 172                         rndis_msg->msg.init_complete.
 173                            pkt_alignment_factor);
 174                 break;
 175
 176         case RNDIS_MSG_QUERY_C:
 177                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 178                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 179                         "buf offset %u)\n",
 180                         rndis_msg->msg_len,
 181                         rndis_msg->msg.query_complete.req_id,
 182                         rndis_msg->msg.query_complete.status,
 183                         rndis_msg->msg.query_complete.
 184                            info_buflen,
 185                         rndis_msg->msg.query_complete.
 186                            info_buf_offset);
 187                 break;
 188
 189         case RNDIS_MSG_SET_C:
 190                 netdev_dbg(netdev,
 191                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 192                         rndis_msg->msg_len,
 193                         rndis_msg->msg.set_complete.req_id,
 194                         rndis_msg->msg.set_complete.status);
 195                 break;
 196
 197         case RNDIS_MSG_INDICATE:
 198                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 199                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 200                         rndis_msg->msg_len,
 201                         rndis_msg->msg.indicate_status.status,
 202                         rndis_msg->msg.indicate_status.status_buflen,
 203                         rndis_msg->msg.indicate_status.status_buf_offset);
 204                 break;
 205
 206         default:
 207                 netdev_dbg(netdev, "0x%x (len %u)\n",
 208                         rndis_msg->ndis_msg_type,
 209                         rndis_msg->msg_len);
 210                 break;
 211         }
 212 }
 213
 214 static int rndis_filter_send_request(struct rndis_device *dev,
 215                                   struct rndis_request *req)
 216 {
 217         struct hv_netvsc_packet *packet;
 218         struct hv_page_buffer page_buf[2];
 219         struct hv_page_buffer *pb = page_buf;
 220         int ret;
 221
 222         /* Setup the packet to send it */
 223         packet = &req->pkt;
 224
 225         packet->total_data_buflen = req->request_msg.msg_len;
 226         packet->page_buf_cnt = 1;
 227
 228         pb[0].pfn = virt_to_phys(&req->request_msg) >>
 229                                         PAGE_SHIFT;
 230         pb[0].len = req->request_msg.msg_len;
 231         pb[0].offset =
 232                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 233
 234         /* Add one page_buf when request_msg crossing page boundary */
 235         if (pb[0].offset + pb[0].len > PAGE_SIZE) {
 236                 packet->page_buf_cnt++;
 237                 pb[0].len = PAGE_SIZE -
 238                         pb[0].offset;
 239                 pb[1].pfn = virt_to_phys((void *)&req->request_msg
 240                         + pb[0].len) >> PAGE_SHIFT;
 241                 pb[1].offset = 0;
 242                 pb[1].len = req->request_msg.msg_len -
 243                         pb[0].len;
 244         }
 245
 246         rcu_read_lock_bh();
 247         ret = netvsc_send(dev->ndev, packet, NULL, pb, NULL);
 248         rcu_read_unlock_bh();
 249
 250         return ret;
 251 }
 252
 253 static void rndis_set_link_state(struct rndis_device *rdev,
 254                                  struct rndis_request *request)
 255 {
 256         u32 link_status;
 257         struct rndis_query_complete *query_complete;
 258
 259         query_complete = &request->response_msg.msg.query_complete;
 260
 261         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 262             query_complete->info_buflen == sizeof(u32)) {
 263                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 264                        query_complete->info_buf_offset), sizeof(u32));
 265                 rdev->link_state = link_status != 0;
 266         }
 267 }
 268
 269 static void rndis_filter_receive_response(struct net_device *ndev,
 270                                           struct netvsc_device *nvdev,
 271                                           const struct rndis_message *resp)
 272 {
 273         struct rndis_device *dev = nvdev->extension;
 274         struct rndis_request *request = NULL;
 275         bool found = false;
 276         unsigned long flags;
 277
 278         /* This should never happen, it means control message
 279          * response received after device removed.
 280          */
 281         if (dev->state == RNDIS_DEV_UNINITIALIZED) {
 282                 netdev_err(ndev,
 283                            "got rndis message uninitialized\n");
 284                 return;
 285         }
 286
 287         spin_lock_irqsave(&dev->request_lock, flags);
 288         list_for_each_entry(request, &dev->req_list, list_ent) {
 289                 /*
 290                  * All request/response message contains RequestId as the 1st
 291                  * field
 292                  */
 293                 if (request->request_msg.msg.init_req.req_id
 294                     == resp->msg.init_complete.req_id) {
 295                         found = true;
 296                         break;
 297                 }
 298         }
 299         spin_unlock_irqrestore(&dev->request_lock, flags);
 300
 301         if (found) {
 302                 if (resp->msg_len <=
 303                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 304                         memcpy(&request->response_msg, resp,
 305                                resp->msg_len);
 306                         if (request->request_msg.ndis_msg_type ==
 307                             RNDIS_MSG_QUERY && request->request_msg.msg.
 308                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 309                                 rndis_set_link_state(dev, request);
 310                 } else {
 311                         netdev_err(ndev,
 312                                 "rndis response buffer overflow "
 313                                 "detected (size %u max %zu)\n",
 314                                 resp->msg_len,
 315                                 sizeof(struct rndis_message));
 316
 317                         if (resp->ndis_msg_type ==
 318                             RNDIS_MSG_RESET_C) {
 319                                 /* does not have a request id field */
 320                                 request->response_msg.msg.reset_complete.
 321                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 322                         } else {
 323                                 request->response_msg.msg.
 324                                 init_complete.status =
 325                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 326                         }
 327                 }
 328
 329                 complete(&request->wait_event);
 330         } else {
 331                 netdev_err(ndev,
 332                         "no rndis request found for this response "
 333                         "(id 0x%x res type 0x%x)\n",
 334                         resp->msg.init_complete.req_id,
 335                         resp->ndis_msg_type);
 336         }
 337 }
 338
 339 /*
 340  * Get the Per-Packet-Info with the specified type
 341  * return NULL if not found.
 342  */
 343 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 344 {
 345         struct rndis_per_packet_info *ppi;
 346         int len;
 347
 348         if (rpkt->per_pkt_info_offset == 0)
 349                 return NULL;
 350
 351         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 352                 rpkt->per_pkt_info_offset);
 353         len = rpkt->per_pkt_info_len;
 354
 355         while (len > 0) {
 356                 if (ppi->type == type)
 357                         return (void *)((ulong)ppi + ppi->ppi_offset);
 358                 len -= ppi->size;
 359                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 360         }
 361
 362         return NULL;
 363 }
 364
 365 static int rndis_filter_receive_data(struct net_device *ndev,
 366                                      struct netvsc_device *nvdev,
 367                                      struct rndis_message *msg,
 368                                      struct vmbus_channel *channel,
 369                                      void *data, u32 data_buflen)
 370 {
 371         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 372         const struct ndis_tcp_ip_checksum_info *csum_info;
 373         const struct ndis_pkt_8021q_info *vlan;
 374         u32 data_offset;
 375
 376         /* Remove the rndis header and pass it back up the stack */
 377         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 378
 379         data_buflen -= data_offset;
 380
 381         /*
 382          * Make sure we got a valid RNDIS message, now total_data_buflen
 383          * should be the data packet size plus the trailer padding size
 384          */
 385         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 386                 netdev_err(ndev, "rndis message buffer "
 387                            "overflow detected (got %u, min %u)"
 388                            "...dropping this message!\n",
 389                            data_buflen, rndis_pkt->data_len);
 390                 return NVSP_STAT_FAIL;
 391         }
 392
 393         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 394
 395         /*
 396          * Remove the rndis trailer padding from rndis packet message
 397          * rndis_pkt->data_len tell us the real data length, we only copy
 398          * the data packet to the stack, without the rndis trailer padding
 399          */
 400         data = (void *)((unsigned long)data + data_offset);
 401         csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
 402         return netvsc_recv_callback(ndev, channel,
 403                                     data, rndis_pkt->data_len,
 404                                     csum_info, vlan);
 405 }
 406
 407 int rndis_filter_receive(struct net_device *ndev,
 408                          struct netvsc_device *net_dev,
 409                          struct hv_device *dev,
 410                          struct vmbus_channel *channel,
 411                          void *data, u32 buflen)
 412 {
 413         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 414         struct rndis_message *rndis_msg = data;
 415
 416         if (netif_msg_rx_status(net_device_ctx))
 417                 dump_rndis_message(dev, rndis_msg);
 418
 419         switch (rndis_msg->ndis_msg_type) {
 420         case RNDIS_MSG_PACKET:
 421                 return rndis_filter_receive_data(ndev, net_dev, rndis_msg,
 422                                                  channel, data, buflen);
 423         case RNDIS_MSG_INIT_C:
 424         case RNDIS_MSG_QUERY_C:
 425         case RNDIS_MSG_SET_C:
 426                 /* completion msgs */
 427                 rndis_filter_receive_response(ndev, net_dev, rndis_msg);
 428                 break;
 429
 430         case RNDIS_MSG_INDICATE:
 431                 /* notification msgs */
 432                 netvsc_linkstatus_callback(dev, rndis_msg);
 433                 break;
 434         default:
 435                 netdev_err(ndev,
 436                         "unhandled rndis message (type %u len %u)\n",
 437                            rndis_msg->ndis_msg_type,
 438                            rndis_msg->msg_len);
 439                 break;
 440         }
 441
 442         return 0;
 443 }
 444
 445 static int rndis_filter_query_device(struct rndis_device *dev,
 446                                      struct netvsc_device *nvdev,
 447                                      u32 oid, void *result, u32 *result_size)
 448 {
 449         struct rndis_request *request;
 450         u32 inresult_size = *result_size;
 451         struct rndis_query_request *query;
 452         struct rndis_query_complete *query_complete;
 453         int ret = 0;
 454
 455         if (!result)
 456                 return -EINVAL;
 457
 458         *result_size = 0;
 459         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 460                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 461         if (!request) {
 462                 ret = -ENOMEM;
 463                 goto cleanup;
 464         }
 465
 466         /* Setup the rndis query */
 467         query = &request->request_msg.msg.query_req;
 468         query->oid = oid;
 469         query->info_buf_offset = sizeof(struct rndis_query_request);
 470         query->info_buflen = 0;
 471         query->dev_vc_handle = 0;
 472
 473         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 474                 struct ndis_offload *hwcaps;
 475                 u32 nvsp_version = nvdev->nvsp_version;
 476                 u8 ndis_rev;
 477                 size_t size;
 478
 479                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 480                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 481                         size = NDIS_OFFLOAD_SIZE;
 482                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 483                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 484                         size = NDIS_OFFLOAD_SIZE_6_1;
 485                 } else {
 486                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 487                         size = NDIS_OFFLOAD_SIZE_6_0;
 488                 }
 489
 490                 request->request_msg.msg_len += size;
 491                 query->info_buflen = size;
 492                 hwcaps = (struct ndis_offload *)
 493                         ((unsigned long)query + query->info_buf_offset);
 494
 495                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 496                 hwcaps->header.revision = ndis_rev;
 497                 hwcaps->header.size = size;
 498
 499         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 500                 struct ndis_recv_scale_cap *cap;
 501
 502                 request->request_msg.msg_len +=
 503                         sizeof(struct ndis_recv_scale_cap);
 504                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 505                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 506                                                      query->info_buf_offset);
 507                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 508                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 509                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 510         }
 511
 512         ret = rndis_filter_send_request(dev, request);
 513         if (ret != 0)
 514                 goto cleanup;
 515
 516         wait_for_completion(&request->wait_event);
 517
 518         /* Copy the response back */
 519         query_complete = &request->response_msg.msg.query_complete;
 520
 521         if (query_complete->info_buflen > inresult_size) {
 522                 ret = -1;
 523                 goto cleanup;
 524         }
 525
 526         memcpy(result,
 527                (void *)((unsigned long)query_complete +
 528                          query_complete->info_buf_offset),
 529                query_complete->info_buflen);
 530
 531         *result_size = query_complete->info_buflen;
 532
 533 cleanup:
 534         if (request)
 535                 put_rndis_request(dev, request);
 536
 537         return ret;
 538 }
 539
 540 /* Get the hardware offload capabilities */
 541 static int
 542 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 543                    struct ndis_offload *caps)
 544 {
 545         u32 caps_len = sizeof(*caps);
 546         int ret;
 547
 548         memset(caps, 0, sizeof(*caps));
 549
 550         ret = rndis_filter_query_device(dev, net_device,
 551                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 552                                         caps, &caps_len);
 553         if (ret)
 554                 return ret;
 555
 556         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 557                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 558                             caps->header.type);
 559                 return -EINVAL;
 560         }
 561
 562         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 563                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 564                             caps->header.revision);
 565                 return -EINVAL;
 566         }
 567
 568         if (caps->header.size > caps_len ||
 569             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 570                 netdev_warn(dev->ndev,
 571                             "invalid NDIS objsize %u, data size %u\n",
 572                             caps->header.size, caps_len);
 573                 return -EINVAL;
 574         }
 575
 576         return 0;
 577 }
 578
 579 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 580                                          struct netvsc_device *net_device)
 581 {
 582         u32 size = ETH_ALEN;
 583
 584         return rndis_filter_query_device(dev, net_device,
 585                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 586                                       dev->hw_mac_adr, &size);
 587 }
 588
 589 #define NWADR_STR "NetworkAddress"
 590 #define NWADR_STRLEN 14
 591
 592 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 593                                 const char *mac)
 594 {
 595         struct rndis_device *rdev = nvdev->extension;
 596         struct rndis_request *request;
 597         struct rndis_set_request *set;
 598         struct rndis_config_parameter_info *cpi;
 599         wchar_t *cfg_nwadr, *cfg_mac;
 600         struct rndis_set_complete *set_complete;
 601         char macstr[2*ETH_ALEN+1];
 602         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 603                 2*NWADR_STRLEN + 4*ETH_ALEN;
 604         int ret;
 605
 606         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 607                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 608         if (!request)
 609                 return -ENOMEM;
 610
 611         set = &request->request_msg.msg.set_req;
 612         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 613         set->info_buflen = extlen;
 614         set->info_buf_offset = sizeof(struct rndis_set_request);
 615         set->dev_vc_handle = 0;
 616
 617         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 618                 set->info_buf_offset);
 619         cpi->parameter_name_offset =
 620                 sizeof(struct rndis_config_parameter_info);
 621         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 622         cpi->parameter_name_length = 2*NWADR_STRLEN;
 623         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 624         cpi->parameter_value_offset =
 625                 cpi->parameter_name_offset + cpi->parameter_name_length;
 626         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 627         cpi->parameter_value_length = 4*ETH_ALEN;
 628
 629         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 630         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 631         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 632                               cfg_nwadr, NWADR_STRLEN);
 633         if (ret < 0)
 634                 goto cleanup;
 635         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 636         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 637                               cfg_mac, 2*ETH_ALEN);
 638         if (ret < 0)
 639                 goto cleanup;
 640
 641         ret = rndis_filter_send_request(rdev, request);
 642         if (ret != 0)
 643                 goto cleanup;
 644
 645         wait_for_completion(&request->wait_event);
 646
 647         set_complete = &request->response_msg.msg.set_complete;
 648         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 649                 ret = -EIO;
 650
 651 cleanup:
 652         put_rndis_request(rdev, request);
 653         return ret;
 654 }
 655
 656 static int
 657 rndis_filter_set_offload_params(struct net_device *ndev,
 658                                 struct netvsc_device *nvdev,
 659                                 struct ndis_offload_params *req_offloads)
 660 {
 661         struct rndis_device *rdev = nvdev->extension;
 662         struct rndis_request *request;
 663         struct rndis_set_request *set;
 664         struct ndis_offload_params *offload_params;
 665         struct rndis_set_complete *set_complete;
 666         u32 extlen = sizeof(struct ndis_offload_params);
 667         int ret;
 668         u32 vsp_version = nvdev->nvsp_version;
 669
 670         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 671                 extlen = VERSION_4_OFFLOAD_SIZE;
 672                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 673                  * UDP checksum offload.
 674                  */
 675                 req_offloads->udp_ip_v4_csum = 0;
 676                 req_offloads->udp_ip_v6_csum = 0;
 677         }
 678
 679         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 680                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 681         if (!request)
 682                 return -ENOMEM;
 683
 684         set = &request->request_msg.msg.set_req;
 685         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 686         set->info_buflen = extlen;
 687         set->info_buf_offset = sizeof(struct rndis_set_request);
 688         set->dev_vc_handle = 0;
 689
 690         offload_params = (struct ndis_offload_params *)((ulong)set +
 691                                 set->info_buf_offset);
 692         *offload_params = *req_offloads;
 693         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 694         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 695         offload_params->header.size = extlen;
 696
 697         ret = rndis_filter_send_request(rdev, request);
 698         if (ret != 0)
 699                 goto cleanup;
 700
 701         wait_for_completion(&request->wait_event);
 702         set_complete = &request->response_msg.msg.set_complete;
 703         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 704                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 705                            set_complete->status);
 706                 ret = -EINVAL;
 707         }
 708
 709 cleanup:
 710         put_rndis_request(rdev, request);
 711         return ret;
 712 }
 713
 714 static int rndis_set_rss_param_msg(struct rndis_device *rdev,
 715                                    const u8 *rss_key, u16 flag)
 716 {
 717         struct net_device *ndev = rdev->ndev;
 718         struct net_device_context *ndc = netdev_priv(ndev);
 719         struct rndis_request *request;
 720         struct rndis_set_request *set;
 721         struct rndis_set_complete *set_complete;
 722         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 723                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 724         struct ndis_recv_scale_param *rssp;
 725         u32 *itab;
 726         u8 *keyp;
 727         int i, ret;
 728
 729         request = get_rndis_request(
 730                         rdev, RNDIS_MSG_SET,
 731                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 732         if (!request)
 733                 return -ENOMEM;
 734
 735         set = &request->request_msg.msg.set_req;
 736         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 737         set->info_buflen = extlen;
 738         set->info_buf_offset = sizeof(struct rndis_set_request);
 739         set->dev_vc_handle = 0;
 740
 741         rssp = (struct ndis_recv_scale_param *)(set + 1);
 742         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 743         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 744         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 745         rssp->flag = flag;
 746         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 747                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 748                          NDIS_HASH_TCP_IPV6;
 749         rssp->indirect_tabsize = 4*ITAB_NUM;
 750         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 751         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 752         rssp->kashkey_offset = rssp->indirect_taboffset +
 753                                rssp->indirect_tabsize;
 754
 755         /* Set indirection table entries */
 756         itab = (u32 *)(rssp + 1);
 757         for (i = 0; i < ITAB_NUM; i++)
 758                 itab[i] = ndc->rx_table[i];
 759
 760         /* Set hask key values */
 761         keyp = (u8 *)((unsigned long)rssp + rssp->kashkey_offset);
 762         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 763
 764         ret = rndis_filter_send_request(rdev, request);
 765         if (ret != 0)
 766                 goto cleanup;
 767
 768         wait_for_completion(&request->wait_event);
 769         set_complete = &request->response_msg.msg.set_complete;
 770         if (set_complete->status == RNDIS_STATUS_SUCCESS) {
 771                 if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
 772                     !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
 773                         memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 774
 775         } else {
 776                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 777                            set_complete->status);
 778                 ret = -EINVAL;
 779         }
 780
 781 cleanup:
 782         put_rndis_request(rdev, request);
 783         return ret;
 784 }
 785
 786 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 787                                const u8 *rss_key)
 788 {
 789         /* Disable RSS before change */
 790         rndis_set_rss_param_msg(rdev, rss_key,
 791                                 NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
 792
 793         return rndis_set_rss_param_msg(rdev, rss_key, 0);
 794 }
 795
 796 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 797                                                  struct netvsc_device *net_device)
 798 {
 799         u32 size = sizeof(u32);
 800         u32 link_status;
 801
 802         return rndis_filter_query_device(dev, net_device,
 803                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 804                                          &link_status, &size);
 805 }
 806
 807 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 808                                          struct netvsc_device *net_device)
 809 {
 810         u32 size = sizeof(u32);
 811         u32 link_speed;
 812         struct net_device_context *ndc;
 813         int ret;
 814
 815         ret = rndis_filter_query_device(dev, net_device,
 816                                         RNDIS_OID_GEN_LINK_SPEED,
 817                                         &link_speed, &size);
 818
 819         if (!ret) {
 820                 ndc = netdev_priv(dev->ndev);
 821
 822                 /* The link speed reported from host is in 100bps unit, so
 823                  * we convert it to Mbps here.
 824                  */
 825                 ndc->speed = link_speed / 10000;
 826         }
 827
 828         return ret;
 829 }
 830
 831 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 832                                           u32 new_filter)
 833 {
 834         struct rndis_request *request;
 835         struct rndis_set_request *set;
 836         int ret;
 837
 838         request = get_rndis_request(dev, RNDIS_MSG_SET,
 839                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 840                         sizeof(u32));
 841         if (!request)
 842                 return -ENOMEM;
 843
 844
 845         /* Setup the rndis set */
 846         set = &request->request_msg.msg.set_req;
 847         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 848         set->info_buflen = sizeof(u32);
 849         set->info_buf_offset = sizeof(struct rndis_set_request);
 850
 851         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 852                &new_filter, sizeof(u32));
 853
 854         ret = rndis_filter_send_request(dev, request);
 855         if (ret == 0)
 856                 wait_for_completion(&request->wait_event);
 857
 858         put_rndis_request(dev, request);
 859
 860         return ret;
 861 }
 862
 863 static void rndis_set_multicast(struct work_struct *w)
 864 {
 865         struct rndis_device *rdev
 866                 = container_of(w, struct rndis_device, mcast_work);
 867         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
 868         unsigned int flags = rdev->ndev->flags;
 869
 870         if (flags & IFF_PROMISC) {
 871                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 872         } else {
 873                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 874                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 875                 if (flags & IFF_BROADCAST)
 876                         filter |= NDIS_PACKET_TYPE_BROADCAST;
 877         }
 878
 879         rndis_filter_set_packet_filter(rdev, filter);
 880 }
 881
 882 void rndis_filter_update(struct netvsc_device *nvdev)
 883 {
 884         struct rndis_device *rdev = nvdev->extension;
 885
 886         schedule_work(&rdev->mcast_work);
 887 }
 888
 889 static int rndis_filter_init_device(struct rndis_device *dev,
 890                                     struct netvsc_device *nvdev)
 891 {
 892         struct rndis_request *request;
 893         struct rndis_initialize_request *init;
 894         struct rndis_initialize_complete *init_complete;
 895         u32 status;
 896         int ret;
 897
 898         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 899                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 900         if (!request) {
 901                 ret = -ENOMEM;
 902                 goto cleanup;
 903         }
 904
 905         /* Setup the rndis set */
 906         init = &request->request_msg.msg.init_req;
 907         init->major_ver = RNDIS_MAJOR_VERSION;
 908         init->minor_ver = RNDIS_MINOR_VERSION;
 909         init->max_xfer_size = 0x4000;
 910
 911         dev->state = RNDIS_DEV_INITIALIZING;
 912
 913         ret = rndis_filter_send_request(dev, request);
 914         if (ret != 0) {
 915                 dev->state = RNDIS_DEV_UNINITIALIZED;
 916                 goto cleanup;
 917         }
 918
 919         wait_for_completion(&request->wait_event);
 920
 921         init_complete = &request->response_msg.msg.init_complete;
 922         status = init_complete->status;
 923         if (status == RNDIS_STATUS_SUCCESS) {
 924                 dev->state = RNDIS_DEV_INITIALIZED;
 925                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 926                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 927                 ret = 0;
 928         } else {
 929                 dev->state = RNDIS_DEV_UNINITIALIZED;
 930                 ret = -EINVAL;
 931         }
 932
 933 cleanup:
 934         if (request)
 935                 put_rndis_request(dev, request);
 936
 937         return ret;
 938 }
 939
 940 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 941 {
 942         int i;
 943
 944         for (i = 0; i < nvdev->num_chn; i++) {
 945                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 946
 947                 if (nvchan->mrc.first != nvchan->mrc.next)
 948                         return false;
 949
 950                 if (atomic_read(&nvchan->queue_sends) > 0)
 951                         return false;
 952         }
 953
 954         return true;
 955 }
 956
 957 static void rndis_filter_halt_device(struct rndis_device *dev)
 958 {
 959         struct rndis_request *request;
 960         struct rndis_halt_request *halt;
 961         struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
 962         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 963
 964         /* Attempt to do a rndis device halt */
 965         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 966                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 967         if (!request)
 968                 goto cleanup;
 969
 970         /* Setup the rndis set */
 971         halt = &request->request_msg.msg.halt_req;
 972         halt->req_id = atomic_inc_return(&dev->new_req_id);
 973
 974         /* Ignore return since this msg is optional. */
 975         rndis_filter_send_request(dev, request);
 976
 977         dev->state = RNDIS_DEV_UNINITIALIZED;
 978
 979 cleanup:
 980         nvdev->destroy = true;
 981
 982         /* Force flag to be ordered before waiting */
 983         wmb();
 984
 985         /* Wait for all send completions */
 986         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
 987
 988         if (request)
 989                 put_rndis_request(dev, request);
 990 }
 991
 992 static int rndis_filter_open_device(struct rndis_device *dev)
 993 {
 994         int ret;
 995
 996         if (dev->state != RNDIS_DEV_INITIALIZED)
 997                 return 0;
 998
 999         ret = rndis_filter_set_packet_filter(dev,
1000                                          NDIS_PACKET_TYPE_BROADCAST |
1001                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1002                                          NDIS_PACKET_TYPE_DIRECTED);
1003         if (ret == 0)
1004                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1005
1006         return ret;
1007 }
1008
1009 static int rndis_filter_close_device(struct rndis_device *dev)
1010 {
1011         int ret;
1012
1013         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1014                 return 0;
1015
1016         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1017         cancel_work_sync(&dev->mcast_work);
1018
1019         ret = rndis_filter_set_packet_filter(dev, 0);
1020         if (ret == -ENODEV)
1021                 ret = 0;
1022
1023         if (ret == 0)
1024                 dev->state = RNDIS_DEV_INITIALIZED;
1025
1026         return ret;
1027 }
1028
1029 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1030 {
1031         struct net_device *ndev =
1032                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1033         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1034         struct netvsc_device *nvscdev;
1035         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1036         struct netvsc_channel *nvchan;
1037         int ret;
1038
1039         /* This is safe because this callback only happens when
1040          * new device is being setup and waiting on the channel_init_wait.
1041          */
1042         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1043         if (!nvscdev || chn_index >= nvscdev->num_chn)
1044                 return;
1045
1046         nvchan = nvscdev->chan_table + chn_index;
1047
1048         /* Because the device uses NAPI, all the interrupt batching and
1049          * control is done via Net softirq, not the channel handling
1050          */
1051         set_channel_read_mode(new_sc, HV_CALL_ISR);
1052
1053         /* Set the channel before opening.*/
1054         nvchan->channel = new_sc;
1055
1056         ret = vmbus_open(new_sc, nvscdev->ring_size * PAGE_SIZE,
1057                          nvscdev->ring_size * PAGE_SIZE, NULL, 0,
1058                          netvsc_channel_cb, nvchan);
1059         if (ret == 0)
1060                 napi_enable(&nvchan->napi);
1061         else
1062                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1063
1064         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1065                 wake_up(&nvscdev->subchan_open);
1066 }
1067
1068 /* Open sub-channels after completing the handling of the device probe.
1069  * This breaks overlap of processing the host message for the
1070  * new primary channel with the initialization of sub-channels.
1071  */
1072 int rndis_set_subchannel(struct net_device *ndev, struct netvsc_device *nvdev)
1073 {
1074         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1075         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1076         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1077         struct rndis_device *rdev = nvdev->extension;
1078         int i, ret;
1079
1080         ASSERT_RTNL();
1081
1082         memset(init_packet, 0, sizeof(struct nvsp_message));
1083         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1084         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1085         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1086                                                 nvdev->num_chn - 1;
1087         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1088                                sizeof(struct nvsp_message),
1089                                (unsigned long)init_packet,
1090                                VM_PKT_DATA_INBAND,
1091                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1092         if (ret) {
1093                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1094                 return ret;
1095         }
1096
1097         wait_for_completion(&nvdev->channel_init_wait);
1098         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1099                 netdev_err(ndev, "sub channel request failed\n");
1100                 return -EIO;
1101         }
1102
1103         nvdev->num_chn = 1 +
1104                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1105
1106         /* wait for all sub channels to open */
1107         wait_event(nvdev->subchan_open,
1108                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1109
1110         /* ignore failues from setting rss parameters, still have channels */
1111         rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1112
1113         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1114         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1115
1116         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1117                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1118
1119         return 0;
1120 }
1121
1122 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1123                                    struct netvsc_device *nvdev)
1124 {
1125         struct net_device *net = rndis_device->ndev;
1126         struct net_device_context *net_device_ctx = netdev_priv(net);
1127         struct ndis_offload hwcaps;
1128         struct ndis_offload_params offloads;
1129         unsigned int gso_max_size = GSO_MAX_SIZE;
1130         int ret;
1131
1132         /* Find HW offload capabilities */
1133         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1134         if (ret != 0)
1135                 return ret;
1136
1137         /* A value of zero means "no change"; now turn on what we want. */
1138         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1139
1140         /* Linux does not care about IP checksum, always does in kernel */
1141         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1142
1143         /* Reset previously set hw_features flags */
1144         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1145         net_device_ctx->tx_checksum_mask = 0;
1146
1147         /* Compute tx offload settings based on hw capabilities */
1148         net->hw_features |= NETIF_F_RXCSUM;
1149
1150         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1151                 /* Can checksum TCP */
1152                 net->hw_features |= NETIF_F_IP_CSUM;
1153                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1154
1155                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1156
1157                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1158                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1159                         net->hw_features |= NETIF_F_TSO;
1160
1161                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1162                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1163                 }
1164
1165                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1166                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1167                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1168                 }
1169         }
1170
1171         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1172                 net->hw_features |= NETIF_F_IPV6_CSUM;
1173
1174                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1175                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1176
1177                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1178                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1179                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1180                         net->hw_features |= NETIF_F_TSO6;
1181
1182                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1183                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1184                 }
1185
1186                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1187                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1188                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1189                 }
1190         }
1191
1192         /* In case some hw_features disappeared we need to remove them from
1193          * net->features list as they're no longer supported.
1194          */
1195         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1196
1197         netif_set_gso_max_size(net, gso_max_size);
1198
1199         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1200
1201         return ret;
1202 }
1203
1204 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1205                                       struct netvsc_device_info *device_info)
1206 {
1207         struct net_device *net = hv_get_drvdata(dev);
1208         struct net_device_context *ndc = netdev_priv(net);
1209         struct netvsc_device *net_device;
1210         struct rndis_device *rndis_device;
1211         struct ndis_recv_scale_cap rsscap;
1212         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1213         u32 mtu, size;
1214         u32 num_possible_rss_qs;
1215         int i, ret;
1216
1217         rndis_device = get_rndis_device();
1218         if (!rndis_device)
1219                 return ERR_PTR(-ENODEV);
1220
1221         /* Let the inner driver handle this first to create the netvsc channel
1222          * NOTE! Once the channel is created, we may get a receive callback
1223          * (RndisFilterOnReceive()) before this call is completed
1224          */
1225         net_device = netvsc_device_add(dev, device_info);
1226         if (IS_ERR(net_device)) {
1227                 kfree(rndis_device);
1228                 return net_device;
1229         }
1230
1231         /* Initialize the rndis device */
1232         net_device->max_chn = 1;
1233         net_device->num_chn = 1;
1234
1235         net_device->extension = rndis_device;
1236         rndis_device->ndev = net;
1237
1238         /* Send the rndis initialization message */
1239         ret = rndis_filter_init_device(rndis_device, net_device);
1240         if (ret != 0)
1241                 goto err_dev_remv;
1242
1243         /* Get the MTU from the host */
1244         size = sizeof(u32);
1245         ret = rndis_filter_query_device(rndis_device, net_device,
1246                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1247                                         &mtu, &size);
1248         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1249                 net->mtu = mtu;
1250
1251         /* Get the mac address */
1252         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1253         if (ret != 0)
1254                 goto err_dev_remv;
1255
1256         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1257
1258         /* Query and set hardware capabilities */
1259         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1260         if (ret != 0)
1261                 goto err_dev_remv;
1262
1263         rndis_filter_query_device_link_status(rndis_device, net_device);
1264
1265         netdev_dbg(net, "Device MAC %pM link state %s\n",
1266                    rndis_device->hw_mac_adr,
1267                    rndis_device->link_state ? "down" : "up");
1268
1269         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1270                 goto out;
1271
1272         rndis_filter_query_link_speed(rndis_device, net_device);
1273
1274         /* vRSS setup */
1275         memset(&rsscap, 0, rsscap_size);
1276         ret = rndis_filter_query_device(rndis_device, net_device,
1277                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1278                                         &rsscap, &rsscap_size);
1279         if (ret || rsscap.num_recv_que < 2)
1280                 goto out;
1281
1282         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1283         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1284                                     rsscap.num_recv_que);
1285
1286         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1287
1288         /* We will use the given number of channels if available. */
1289         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1290
1291         if (!netif_is_rxfh_configured(net)) {
1292                 for (i = 0; i < ITAB_NUM; i++)
1293                         ndc->rx_table[i] = ethtool_rxfh_indir_default(
1294                                                 i, net_device->num_chn);
1295         }
1296
1297         atomic_set(&net_device->open_chn, 1);
1298         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1299
1300         for (i = 1; i < net_device->num_chn; i++) {
1301                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1302                 if (ret) {
1303                         while (--i != 0)
1304                                 vfree(net_device->chan_table[i].mrc.slots);
1305                         goto out;
1306                 }
1307         }
1308
1309         for (i = 1; i < net_device->num_chn; i++)
1310                 netif_napi_add(net, &net_device->chan_table[i].napi,
1311                                netvsc_poll, NAPI_POLL_WEIGHT);
1312
1313         return net_device;
1314
1315 out:
1316         /* setting up multiple channels failed */
1317         net_device->max_chn = 1;
1318         net_device->num_chn = 1;
1319         return net_device;
1320
1321 err_dev_remv:
1322         rndis_filter_device_remove(dev, net_device);
1323         return ERR_PTR(ret);
1324 }
1325
1326 void rndis_filter_device_remove(struct hv_device *dev,
1327                                 struct netvsc_device *net_dev)
1328 {
1329         struct rndis_device *rndis_dev = net_dev->extension;
1330
1331         /* Halt and release the rndis device */
1332         rndis_filter_halt_device(rndis_dev);
1333
1334         netvsc_device_remove(dev);
1335 }
1336
1337 int rndis_filter_open(struct netvsc_device *nvdev)
1338 {
1339         if (!nvdev)
1340                 return -EINVAL;
1341
1342         if (atomic_inc_return(&nvdev->open_cnt) != 1)
1343                 return 0;
1344
1345         return rndis_filter_open_device(nvdev->extension);
1346 }
1347
1348 int rndis_filter_close(struct netvsc_device *nvdev)
1349 {
1350         if (!nvdev)
1351                 return -EINVAL;
1352
1353         if (atomic_dec_return(&nvdev->open_cnt) != 0)
1354                 return 0;
1355
1356         return rndis_filter_close_device(nvdev->extension);
1357 }