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 <[email protected]>
  18  *   Hank Janssen  <[email protected]>
  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         struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
 221         int ret;
 222
 223         /* Setup the packet to send it */
 224         packet = &req->pkt;
 225
 226         packet->total_data_buflen = req->request_msg.msg_len;
 227         packet->page_buf_cnt = 1;
 228
 229         pb[0].pfn = virt_to_phys(&req->request_msg) >>
 230                                         PAGE_SHIFT;
 231         pb[0].len = req->request_msg.msg_len;
 232         pb[0].offset =
 233                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 234
 235         /* Add one page_buf when request_msg crossing page boundary */
 236         if (pb[0].offset + pb[0].len > PAGE_SIZE) {
 237                 packet->page_buf_cnt++;
 238                 pb[0].len = PAGE_SIZE -
 239                         pb[0].offset;
 240                 pb[1].pfn = virt_to_phys((void *)&req->request_msg
 241                         + pb[0].len) >> PAGE_SHIFT;
 242                 pb[1].offset = 0;
 243                 pb[1].len = req->request_msg.msg_len -
 244                         pb[0].len;
 245         }
 246
 247         rcu_read_lock_bh();
 248         ret = netvsc_send(net_device_ctx, packet, NULL, pb, NULL);
 249         rcu_read_unlock_bh();
 250
 251         return ret;
 252 }
 253
 254 static void rndis_set_link_state(struct rndis_device *rdev,
 255                                  struct rndis_request *request)
 256 {
 257         u32 link_status;
 258         struct rndis_query_complete *query_complete;
 259
 260         query_complete = &request->response_msg.msg.query_complete;
 261
 262         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 263             query_complete->info_buflen == sizeof(u32)) {
 264                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 265                        query_complete->info_buf_offset), sizeof(u32));
 266                 rdev->link_state = link_status != 0;
 267         }
 268 }
 269
 270 static void rndis_filter_receive_response(struct rndis_device *dev,
 271                                        struct rndis_message *resp)
 272 {
 273         struct rndis_request *request = NULL;
 274         bool found = false;
 275         unsigned long flags;
 276         struct net_device *ndev = dev->ndev;
 277
 278         spin_lock_irqsave(&dev->request_lock, flags);
 279         list_for_each_entry(request, &dev->req_list, list_ent) {
 280                 /*
 281                  * All request/response message contains RequestId as the 1st
 282                  * field
 283                  */
 284                 if (request->request_msg.msg.init_req.req_id
 285                     == resp->msg.init_complete.req_id) {
 286                         found = true;
 287                         break;
 288                 }
 289         }
 290         spin_unlock_irqrestore(&dev->request_lock, flags);
 291
 292         if (found) {
 293                 if (resp->msg_len <=
 294                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 295                         memcpy(&request->response_msg, resp,
 296                                resp->msg_len);
 297                         if (request->request_msg.ndis_msg_type ==
 298                             RNDIS_MSG_QUERY && request->request_msg.msg.
 299                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 300                                 rndis_set_link_state(dev, request);
 301                 } else {
 302                         netdev_err(ndev,
 303                                 "rndis response buffer overflow "
 304                                 "detected (size %u max %zu)\n",
 305                                 resp->msg_len,
 306                                 sizeof(struct rndis_message));
 307
 308                         if (resp->ndis_msg_type ==
 309                             RNDIS_MSG_RESET_C) {
 310                                 /* does not have a request id field */
 311                                 request->response_msg.msg.reset_complete.
 312                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 313                         } else {
 314                                 request->response_msg.msg.
 315                                 init_complete.status =
 316                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 317                         }
 318                 }
 319
 320                 complete(&request->wait_event);
 321         } else {
 322                 netdev_err(ndev,
 323                         "no rndis request found for this response "
 324                         "(id 0x%x res type 0x%x)\n",
 325                         resp->msg.init_complete.req_id,
 326                         resp->ndis_msg_type);
 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 int rndis_filter_receive_data(struct net_device *ndev,
 357                                      struct rndis_device *dev,
 358                                      struct rndis_message *msg,
 359                                      struct vmbus_channel *channel,
 360                                      void *data, u32 data_buflen)
 361 {
 362         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 363         const struct ndis_tcp_ip_checksum_info *csum_info;
 364         const struct ndis_pkt_8021q_info *vlan;
 365         u32 data_offset;
 366
 367         /* Remove the rndis header and pass it back up the stack */
 368         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 369
 370         data_buflen -= data_offset;
 371
 372         /*
 373          * Make sure we got a valid RNDIS message, now total_data_buflen
 374          * should be the data packet size plus the trailer padding size
 375          */
 376         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 377                 netdev_err(dev->ndev, "rndis message buffer "
 378                            "overflow detected (got %u, min %u)"
 379                            "...dropping this message!\n",
 380                            data_buflen, rndis_pkt->data_len);
 381                 return NVSP_STAT_FAIL;
 382         }
 383
 384         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 385
 386         /*
 387          * Remove the rndis trailer padding from rndis packet message
 388          * rndis_pkt->data_len tell us the real data length, we only copy
 389          * the data packet to the stack, without the rndis trailer padding
 390          */
 391         data = (void *)((unsigned long)data + data_offset);
 392         csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
 393         return netvsc_recv_callback(ndev, channel,
 394                                     data, rndis_pkt->data_len,
 395                                     csum_info, vlan);
 396 }
 397
 398 int rndis_filter_receive(struct net_device *ndev,
 399                          struct netvsc_device *net_dev,
 400                          struct hv_device *dev,
 401                          struct vmbus_channel *channel,
 402                          void *data, u32 buflen)
 403 {
 404         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 405         struct rndis_device *rndis_dev = net_dev->extension;
 406         struct rndis_message *rndis_msg = data;
 407
 408         /* Make sure the rndis device state is initialized */
 409         if (unlikely(!rndis_dev)) {
 410                 netif_dbg(net_device_ctx, rx_err, ndev,
 411                           "got rndis message but no rndis device!\n");
 412                 return NVSP_STAT_FAIL;
 413         }
 414
 415         if (unlikely(rndis_dev->state == RNDIS_DEV_UNINITIALIZED)) {
 416                 netif_dbg(net_device_ctx, rx_err, ndev,
 417                           "got rndis message uninitialized\n");
 418                 return NVSP_STAT_FAIL;
 419         }
 420
 421         if (netif_msg_rx_status(net_device_ctx))
 422                 dump_rndis_message(dev, rndis_msg);
 423
 424         switch (rndis_msg->ndis_msg_type) {
 425         case RNDIS_MSG_PACKET:
 426                 return rndis_filter_receive_data(ndev, rndis_dev, rndis_msg,
 427                                                  channel, data, buflen);
 428         case RNDIS_MSG_INIT_C:
 429         case RNDIS_MSG_QUERY_C:
 430         case RNDIS_MSG_SET_C:
 431                 /* completion msgs */
 432                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 433                 break;
 434
 435         case RNDIS_MSG_INDICATE:
 436                 /* notification msgs */
 437                 netvsc_linkstatus_callback(dev, rndis_msg);
 438                 break;
 439         default:
 440                 netdev_err(ndev,
 441                         "unhandled rndis message (type %u len %u)\n",
 442                            rndis_msg->ndis_msg_type,
 443                            rndis_msg->msg_len);
 444                 break;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static int rndis_filter_query_device(struct rndis_device *dev,
 451                                      struct netvsc_device *nvdev,
 452                                      u32 oid, void *result, u32 *result_size)
 453 {
 454         struct rndis_request *request;
 455         u32 inresult_size = *result_size;
 456         struct rndis_query_request *query;
 457         struct rndis_query_complete *query_complete;
 458         int ret = 0;
 459
 460         if (!result)
 461                 return -EINVAL;
 462
 463         *result_size = 0;
 464         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 465                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 466         if (!request) {
 467                 ret = -ENOMEM;
 468                 goto cleanup;
 469         }
 470
 471         /* Setup the rndis query */
 472         query = &request->request_msg.msg.query_req;
 473         query->oid = oid;
 474         query->info_buf_offset = sizeof(struct rndis_query_request);
 475         query->info_buflen = 0;
 476         query->dev_vc_handle = 0;
 477
 478         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 479                 struct ndis_offload *hwcaps;
 480                 u32 nvsp_version = nvdev->nvsp_version;
 481                 u8 ndis_rev;
 482                 size_t size;
 483
 484                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 485                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 486                         size = NDIS_OFFLOAD_SIZE;
 487                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 488                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 489                         size = NDIS_OFFLOAD_SIZE_6_1;
 490                 } else {
 491                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 492                         size = NDIS_OFFLOAD_SIZE_6_0;
 493                 }
 494
 495                 request->request_msg.msg_len += size;
 496                 query->info_buflen = size;
 497                 hwcaps = (struct ndis_offload *)
 498                         ((unsigned long)query + query->info_buf_offset);
 499
 500                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 501                 hwcaps->header.revision = ndis_rev;
 502                 hwcaps->header.size = size;
 503
 504         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 505                 struct ndis_recv_scale_cap *cap;
 506
 507                 request->request_msg.msg_len +=
 508                         sizeof(struct ndis_recv_scale_cap);
 509                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 510                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 511                                                      query->info_buf_offset);
 512                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 513                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 514                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 515         }
 516
 517         ret = rndis_filter_send_request(dev, request);
 518         if (ret != 0)
 519                 goto cleanup;
 520
 521         wait_for_completion(&request->wait_event);
 522
 523         /* Copy the response back */
 524         query_complete = &request->response_msg.msg.query_complete;
 525
 526         if (query_complete->info_buflen > inresult_size) {
 527                 ret = -1;
 528                 goto cleanup;
 529         }
 530
 531         memcpy(result,
 532                (void *)((unsigned long)query_complete +
 533                          query_complete->info_buf_offset),
 534                query_complete->info_buflen);
 535
 536         *result_size = query_complete->info_buflen;
 537
 538 cleanup:
 539         if (request)
 540                 put_rndis_request(dev, request);
 541
 542         return ret;
 543 }
 544
 545 /* Get the hardware offload capabilities */
 546 static int
 547 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 548                    struct ndis_offload *caps)
 549 {
 550         u32 caps_len = sizeof(*caps);
 551         int ret;
 552
 553         memset(caps, 0, sizeof(*caps));
 554
 555         ret = rndis_filter_query_device(dev, net_device,
 556                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 557                                         caps, &caps_len);
 558         if (ret)
 559                 return ret;
 560
 561         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 562                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 563                             caps->header.type);
 564                 return -EINVAL;
 565         }
 566
 567         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 568                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 569                             caps->header.revision);
 570                 return -EINVAL;
 571         }
 572
 573         if (caps->header.size > caps_len ||
 574             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 575                 netdev_warn(dev->ndev,
 576                             "invalid NDIS objsize %u, data size %u\n",
 577                             caps->header.size, caps_len);
 578                 return -EINVAL;
 579         }
 580
 581         return 0;
 582 }
 583
 584 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 585                                          struct netvsc_device *net_device)
 586 {
 587         u32 size = ETH_ALEN;
 588
 589         return rndis_filter_query_device(dev, net_device,
 590                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 591                                       dev->hw_mac_adr, &size);
 592 }
 593
 594 #define NWADR_STR "NetworkAddress"
 595 #define NWADR_STRLEN 14
 596
 597 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 598                                 const char *mac)
 599 {
 600         struct rndis_device *rdev = nvdev->extension;
 601         struct rndis_request *request;
 602         struct rndis_set_request *set;
 603         struct rndis_config_parameter_info *cpi;
 604         wchar_t *cfg_nwadr, *cfg_mac;
 605         struct rndis_set_complete *set_complete;
 606         char macstr[2*ETH_ALEN+1];
 607         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 608                 2*NWADR_STRLEN + 4*ETH_ALEN;
 609         int ret;
 610
 611         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 612                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 613         if (!request)
 614                 return -ENOMEM;
 615
 616         set = &request->request_msg.msg.set_req;
 617         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 618         set->info_buflen = extlen;
 619         set->info_buf_offset = sizeof(struct rndis_set_request);
 620         set->dev_vc_handle = 0;
 621
 622         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 623                 set->info_buf_offset);
 624         cpi->parameter_name_offset =
 625                 sizeof(struct rndis_config_parameter_info);
 626         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 627         cpi->parameter_name_length = 2*NWADR_STRLEN;
 628         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 629         cpi->parameter_value_offset =
 630                 cpi->parameter_name_offset + cpi->parameter_name_length;
 631         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 632         cpi->parameter_value_length = 4*ETH_ALEN;
 633
 634         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 635         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 636         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 637                               cfg_nwadr, NWADR_STRLEN);
 638         if (ret < 0)
 639                 goto cleanup;
 640         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 641         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 642                               cfg_mac, 2*ETH_ALEN);
 643         if (ret < 0)
 644                 goto cleanup;
 645
 646         ret = rndis_filter_send_request(rdev, request);
 647         if (ret != 0)
 648                 goto cleanup;
 649
 650         wait_for_completion(&request->wait_event);
 651
 652         set_complete = &request->response_msg.msg.set_complete;
 653         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 654                 ret = -EIO;
 655
 656 cleanup:
 657         put_rndis_request(rdev, request);
 658         return ret;
 659 }
 660
 661 static int
 662 rndis_filter_set_offload_params(struct net_device *ndev,
 663                                 struct netvsc_device *nvdev,
 664                                 struct ndis_offload_params *req_offloads)
 665 {
 666         struct rndis_device *rdev = nvdev->extension;
 667         struct rndis_request *request;
 668         struct rndis_set_request *set;
 669         struct ndis_offload_params *offload_params;
 670         struct rndis_set_complete *set_complete;
 671         u32 extlen = sizeof(struct ndis_offload_params);
 672         int ret;
 673         u32 vsp_version = nvdev->nvsp_version;
 674
 675         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 676                 extlen = VERSION_4_OFFLOAD_SIZE;
 677                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 678                  * UDP checksum offload.
 679                  */
 680                 req_offloads->udp_ip_v4_csum = 0;
 681                 req_offloads->udp_ip_v6_csum = 0;
 682         }
 683
 684         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 685                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 686         if (!request)
 687                 return -ENOMEM;
 688
 689         set = &request->request_msg.msg.set_req;
 690         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 691         set->info_buflen = extlen;
 692         set->info_buf_offset = sizeof(struct rndis_set_request);
 693         set->dev_vc_handle = 0;
 694
 695         offload_params = (struct ndis_offload_params *)((ulong)set +
 696                                 set->info_buf_offset);
 697         *offload_params = *req_offloads;
 698         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 699         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 700         offload_params->header.size = extlen;
 701
 702         ret = rndis_filter_send_request(rdev, request);
 703         if (ret != 0)
 704                 goto cleanup;
 705
 706         wait_for_completion(&request->wait_event);
 707         set_complete = &request->response_msg.msg.set_complete;
 708         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 709                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 710                            set_complete->status);
 711                 ret = -EINVAL;
 712         }
 713
 714 cleanup:
 715         put_rndis_request(rdev, request);
 716         return ret;
 717 }
 718
 719 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 720                                const u8 *rss_key)
 721 {
 722         struct net_device *ndev = rdev->ndev;
 723         struct rndis_request *request;
 724         struct rndis_set_request *set;
 725         struct rndis_set_complete *set_complete;
 726         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 727                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 728         struct ndis_recv_scale_param *rssp;
 729         u32 *itab;
 730         u8 *keyp;
 731         int i, ret;
 732
 733         request = get_rndis_request(
 734                         rdev, RNDIS_MSG_SET,
 735                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 736         if (!request)
 737                 return -ENOMEM;
 738
 739         set = &request->request_msg.msg.set_req;
 740         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 741         set->info_buflen = extlen;
 742         set->info_buf_offset = sizeof(struct rndis_set_request);
 743         set->dev_vc_handle = 0;
 744
 745         rssp = (struct ndis_recv_scale_param *)(set + 1);
 746         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 747         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 748         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 749         rssp->flag = 0;
 750         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 751                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 752                          NDIS_HASH_TCP_IPV6;
 753         rssp->indirect_tabsize = 4*ITAB_NUM;
 754         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 755         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 756         rssp->kashkey_offset = rssp->indirect_taboffset +
 757                                rssp->indirect_tabsize;
 758
 759         /* Set indirection table entries */
 760         itab = (u32 *)(rssp + 1);
 761         for (i = 0; i < ITAB_NUM; i++)
 762                 itab[i] = rdev->rx_table[i];
 763
 764         /* Set hask key values */
 765         keyp = (u8 *)((unsigned long)rssp + rssp->kashkey_offset);
 766         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 767
 768         ret = rndis_filter_send_request(rdev, request);
 769         if (ret != 0)
 770                 goto cleanup;
 771
 772         wait_for_completion(&request->wait_event);
 773         set_complete = &request->response_msg.msg.set_complete;
 774         if (set_complete->status == RNDIS_STATUS_SUCCESS)
 775                 memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 776         else {
 777                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 778                            set_complete->status);
 779                 ret = -EINVAL;
 780         }
 781
 782 cleanup:
 783         put_rndis_request(rdev, request);
 784         return ret;
 785 }
 786
 787 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 788                                                  struct netvsc_device *net_device)
 789 {
 790         u32 size = sizeof(u32);
 791         u32 link_status;
 792
 793         return rndis_filter_query_device(dev, net_device,
 794                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 795                                          &link_status, &size);
 796 }
 797
 798 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 799                                          struct netvsc_device *net_device)
 800 {
 801         u32 size = sizeof(u32);
 802         u32 link_speed;
 803         struct net_device_context *ndc;
 804         int ret;
 805
 806         ret = rndis_filter_query_device(dev, net_device,
 807                                         RNDIS_OID_GEN_LINK_SPEED,
 808                                         &link_speed, &size);
 809
 810         if (!ret) {
 811                 ndc = netdev_priv(dev->ndev);
 812
 813                 /* The link speed reported from host is in 100bps unit, so
 814                  * we convert it to Mbps here.
 815                  */
 816                 ndc->speed = link_speed / 10000;
 817         }
 818
 819         return ret;
 820 }
 821
 822 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 823                                           u32 new_filter)
 824 {
 825         struct rndis_request *request;
 826         struct rndis_set_request *set;
 827         int ret;
 828
 829         request = get_rndis_request(dev, RNDIS_MSG_SET,
 830                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 831                         sizeof(u32));
 832         if (!request)
 833                 return -ENOMEM;
 834
 835
 836         /* Setup the rndis set */
 837         set = &request->request_msg.msg.set_req;
 838         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 839         set->info_buflen = sizeof(u32);
 840         set->info_buf_offset = sizeof(struct rndis_set_request);
 841
 842         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 843                &new_filter, sizeof(u32));
 844
 845         ret = rndis_filter_send_request(dev, request);
 846         if (ret == 0)
 847                 wait_for_completion(&request->wait_event);
 848
 849         put_rndis_request(dev, request);
 850
 851         return ret;
 852 }
 853
 854 static void rndis_set_multicast(struct work_struct *w)
 855 {
 856         struct rndis_device *rdev
 857                 = container_of(w, struct rndis_device, mcast_work);
 858
 859         if (rdev->ndev->flags & IFF_PROMISC)
 860                 rndis_filter_set_packet_filter(rdev,
 861                                                NDIS_PACKET_TYPE_PROMISCUOUS);
 862         else
 863                 rndis_filter_set_packet_filter(rdev,
 864                                                NDIS_PACKET_TYPE_BROADCAST |
 865                                                NDIS_PACKET_TYPE_ALL_MULTICAST |
 866                                                NDIS_PACKET_TYPE_DIRECTED);
 867 }
 868
 869 void rndis_filter_update(struct netvsc_device *nvdev)
 870 {
 871         struct rndis_device *rdev = nvdev->extension;
 872
 873         schedule_work(&rdev->mcast_work);
 874 }
 875
 876 static int rndis_filter_init_device(struct rndis_device *dev,
 877                                     struct netvsc_device *nvdev)
 878 {
 879         struct rndis_request *request;
 880         struct rndis_initialize_request *init;
 881         struct rndis_initialize_complete *init_complete;
 882         u32 status;
 883         int ret;
 884
 885         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 886                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 887         if (!request) {
 888                 ret = -ENOMEM;
 889                 goto cleanup;
 890         }
 891
 892         /* Setup the rndis set */
 893         init = &request->request_msg.msg.init_req;
 894         init->major_ver = RNDIS_MAJOR_VERSION;
 895         init->minor_ver = RNDIS_MINOR_VERSION;
 896         init->max_xfer_size = 0x4000;
 897
 898         dev->state = RNDIS_DEV_INITIALIZING;
 899
 900         ret = rndis_filter_send_request(dev, request);
 901         if (ret != 0) {
 902                 dev->state = RNDIS_DEV_UNINITIALIZED;
 903                 goto cleanup;
 904         }
 905
 906         wait_for_completion(&request->wait_event);
 907
 908         init_complete = &request->response_msg.msg.init_complete;
 909         status = init_complete->status;
 910         if (status == RNDIS_STATUS_SUCCESS) {
 911                 dev->state = RNDIS_DEV_INITIALIZED;
 912                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 913                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 914                 ret = 0;
 915         } else {
 916                 dev->state = RNDIS_DEV_UNINITIALIZED;
 917                 ret = -EINVAL;
 918         }
 919
 920 cleanup:
 921         if (request)
 922                 put_rndis_request(dev, request);
 923
 924         return ret;
 925 }
 926
 927 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 928 {
 929         int i;
 930
 931         for (i = 0; i < nvdev->num_chn; i++) {
 932                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 933
 934                 if (nvchan->mrc.first != nvchan->mrc.next)
 935                         return false;
 936
 937                 if (atomic_read(&nvchan->queue_sends) > 0)
 938                         return false;
 939         }
 940
 941         return true;
 942 }
 943
 944 static void rndis_filter_halt_device(struct rndis_device *dev)
 945 {
 946         struct rndis_request *request;
 947         struct rndis_halt_request *halt;
 948         struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
 949         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 950
 951         /* Attempt to do a rndis device halt */
 952         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 953                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 954         if (!request)
 955                 goto cleanup;
 956
 957         /* Setup the rndis set */
 958         halt = &request->request_msg.msg.halt_req;
 959         halt->req_id = atomic_inc_return(&dev->new_req_id);
 960
 961         /* Ignore return since this msg is optional. */
 962         rndis_filter_send_request(dev, request);
 963
 964         dev->state = RNDIS_DEV_UNINITIALIZED;
 965
 966 cleanup:
 967         nvdev->destroy = true;
 968
 969         /* Force flag to be ordered before waiting */
 970         wmb();
 971
 972         /* Wait for all send completions */
 973         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
 974
 975         if (request)
 976                 put_rndis_request(dev, request);
 977 }
 978
 979 static int rndis_filter_open_device(struct rndis_device *dev)
 980 {
 981         int ret;
 982
 983         if (dev->state != RNDIS_DEV_INITIALIZED)
 984                 return 0;
 985
 986         ret = rndis_filter_set_packet_filter(dev,
 987                                          NDIS_PACKET_TYPE_BROADCAST |
 988                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 989                                          NDIS_PACKET_TYPE_DIRECTED);
 990         if (ret == 0)
 991                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 992
 993         return ret;
 994 }
 995
 996 static int rndis_filter_close_device(struct rndis_device *dev)
 997 {
 998         int ret;
 999
1000         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1001                 return 0;
1002
1003         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1004         cancel_work_sync(&dev->mcast_work);
1005
1006         ret = rndis_filter_set_packet_filter(dev, 0);
1007         if (ret == -ENODEV)
1008                 ret = 0;
1009
1010         if (ret == 0)
1011                 dev->state = RNDIS_DEV_INITIALIZED;
1012
1013         return ret;
1014 }
1015
1016 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1017 {
1018         struct net_device *ndev =
1019                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1020         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1021         struct netvsc_device *nvscdev;
1022         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1023         struct netvsc_channel *nvchan;
1024         int ret;
1025
1026         /* This is safe because this callback only happens when
1027          * new device is being setup and waiting on the channel_init_wait.
1028          */
1029         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1030         if (!nvscdev || chn_index >= nvscdev->num_chn)
1031                 return;
1032
1033         nvchan = nvscdev->chan_table + chn_index;
1034
1035         /* Because the device uses NAPI, all the interrupt batching and
1036          * control is done via Net softirq, not the channel handling
1037          */
1038         set_channel_read_mode(new_sc, HV_CALL_ISR);
1039
1040         /* Set the channel before opening.*/
1041         nvchan->channel = new_sc;
1042
1043         ret = vmbus_open(new_sc, nvscdev->ring_size * PAGE_SIZE,
1044                          nvscdev->ring_size * PAGE_SIZE, NULL, 0,
1045                          netvsc_channel_cb, nvchan);
1046         if (ret == 0)
1047                 napi_enable(&nvchan->napi);
1048         else
1049                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1050
1051         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1052                 wake_up(&nvscdev->subchan_open);
1053 }
1054
1055 /* Open sub-channels after completing the handling of the device probe.
1056  * This breaks overlap of processing the host message for the
1057  * new primary channel with the initialization of sub-channels.
1058  */
1059 void rndis_set_subchannel(struct work_struct *w)
1060 {
1061         struct netvsc_device *nvdev
1062                 = container_of(w, struct netvsc_device, subchan_work);
1063         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1064         struct net_device_context *ndev_ctx;
1065         struct rndis_device *rdev;
1066         struct net_device *ndev;
1067         struct hv_device *hv_dev;
1068         int i, ret;
1069
1070         if (!rtnl_trylock()) {
1071                 schedule_work(w);
1072                 return;
1073         }
1074
1075         rdev = nvdev->extension;
1076         if (!rdev)
1077                 goto unlock;    /* device was removed */
1078
1079         ndev = rdev->ndev;
1080         ndev_ctx = netdev_priv(ndev);
1081         hv_dev = ndev_ctx->device_ctx;
1082
1083         memset(init_packet, 0, sizeof(struct nvsp_message));
1084         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1085         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1086         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1087                                                 nvdev->num_chn - 1;
1088         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1089                                sizeof(struct nvsp_message),
1090                                (unsigned long)init_packet,
1091                                VM_PKT_DATA_INBAND,
1092                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1093         if (ret) {
1094                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1095                 goto failed;
1096         }
1097
1098         wait_for_completion(&nvdev->channel_init_wait);
1099         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1100                 netdev_err(ndev, "sub channel request failed\n");
1101                 goto failed;
1102         }
1103
1104         nvdev->num_chn = 1 +
1105                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1106
1107         /* wait for all sub channels to open */
1108         wait_event(nvdev->subchan_open,
1109                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1110
1111         /* ignore failues from setting rss parameters, still have channels */
1112         rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1113
1114         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1115         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1116
1117         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1118                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1119
1120         rtnl_unlock();
1121         return;
1122
1123 failed:
1124         /* fallback to only primary channel */
1125         for (i = 1; i < nvdev->num_chn; i++)
1126                 netif_napi_del(&nvdev->chan_table[i].napi);
1127
1128         nvdev->max_chn = 1;
1129         nvdev->num_chn = 1;
1130 unlock:
1131         rtnl_unlock();
1132 }
1133
1134 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1135                                       struct netvsc_device_info *device_info)
1136 {
1137         struct net_device *net = hv_get_drvdata(dev);
1138         struct net_device_context *net_device_ctx = netdev_priv(net);
1139         struct netvsc_device *net_device;
1140         struct rndis_device *rndis_device;
1141         struct ndis_offload hwcaps;
1142         struct ndis_offload_params offloads;
1143         struct ndis_recv_scale_cap rsscap;
1144         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1145         unsigned int gso_max_size = GSO_MAX_SIZE;
1146         u32 mtu, size;
1147         const struct cpumask *node_cpu_mask;
1148         u32 num_possible_rss_qs;
1149         int i, ret;
1150
1151         rndis_device = get_rndis_device();
1152         if (!rndis_device)
1153                 return ERR_PTR(-ENODEV);
1154
1155         /*
1156          * Let the inner driver handle this first to create the netvsc channel
1157          * NOTE! Once the channel is created, we may get a receive callback
1158          * (RndisFilterOnReceive()) before this call is completed
1159          */
1160         net_device = netvsc_device_add(dev, device_info);
1161         if (IS_ERR(net_device)) {
1162                 kfree(rndis_device);
1163                 return net_device;
1164         }
1165
1166         /* Initialize the rndis device */
1167         net_device->max_chn = 1;
1168         net_device->num_chn = 1;
1169
1170         net_device->extension = rndis_device;
1171         rndis_device->ndev = net;
1172
1173         /* Send the rndis initialization message */
1174         ret = rndis_filter_init_device(rndis_device, net_device);
1175         if (ret != 0)
1176                 goto err_dev_remv;
1177
1178         /* Get the MTU from the host */
1179         size = sizeof(u32);
1180         ret = rndis_filter_query_device(rndis_device, net_device,
1181                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1182                                         &mtu, &size);
1183         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1184                 net->mtu = mtu;
1185
1186         /* Get the mac address */
1187         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1188         if (ret != 0)
1189                 goto err_dev_remv;
1190
1191         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1192
1193         /* Find HW offload capabilities */
1194         ret = rndis_query_hwcaps(rndis_device, net_device, &hwcaps);
1195         if (ret != 0)
1196                 goto err_dev_remv;
1197
1198         /* A value of zero means "no change"; now turn on what we want. */
1199         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1200
1201         /* Linux does not care about IP checksum, always does in kernel */
1202         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1203
1204         /* Compute tx offload settings based on hw capabilities */
1205         net->hw_features = NETIF_F_RXCSUM;
1206
1207         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1208                 /* Can checksum TCP */
1209                 net->hw_features |= NETIF_F_IP_CSUM;
1210                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1211
1212                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1213
1214                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1215                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1216                         net->hw_features |= NETIF_F_TSO;
1217
1218                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1219                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1220                 }
1221
1222                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1223                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1224                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1225                 }
1226         }
1227
1228         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1229                 net->hw_features |= NETIF_F_IPV6_CSUM;
1230
1231                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1232                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1233
1234                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1235                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1236                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1237                         net->hw_features |= NETIF_F_TSO6;
1238
1239                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1240                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1241                 }
1242
1243                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1244                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1245                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1246                 }
1247         }
1248
1249         netif_set_gso_max_size(net, gso_max_size);
1250
1251         ret = rndis_filter_set_offload_params(net, net_device, &offloads);
1252         if (ret)
1253                 goto err_dev_remv;
1254
1255         rndis_filter_query_device_link_status(rndis_device, net_device);
1256
1257         netdev_dbg(net, "Device MAC %pM link state %s\n",
1258                    rndis_device->hw_mac_adr,
1259                    rndis_device->link_state ? "down" : "up");
1260
1261         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1262                 return net_device;
1263
1264         rndis_filter_query_link_speed(rndis_device, net_device);
1265
1266         /* vRSS setup */
1267         memset(&rsscap, 0, rsscap_size);
1268         ret = rndis_filter_query_device(rndis_device, net_device,
1269                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1270                                         &rsscap, &rsscap_size);
1271         if (ret || rsscap.num_recv_que < 2)
1272                 goto out;
1273
1274         /*
1275          * We will limit the VRSS channels to the number CPUs in the NUMA node
1276          * the primary channel is currently bound to.
1277          *
1278          * This also guarantees that num_possible_rss_qs <= num_online_cpus
1279          */
1280         node_cpu_mask = cpumask_of_node(cpu_to_node(dev->channel->target_cpu));
1281         num_possible_rss_qs = min_t(u32, cpumask_weight(node_cpu_mask),
1282                                     rsscap.num_recv_que);
1283
1284         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1285
1286         /* We will use the given number of channels if available. */
1287         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1288
1289         for (i = 0; i < ITAB_NUM; i++)
1290                 rndis_device->rx_table[i] = ethtool_rxfh_indir_default(
1291                                                 i, net_device->num_chn);
1292
1293         atomic_set(&net_device->open_chn, 1);
1294         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1295
1296         for (i = 1; i < net_device->num_chn; i++) {
1297                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1298                 if (ret) {
1299                         while (--i != 0)
1300                                 vfree(net_device->chan_table[i].mrc.slots);
1301                         goto out;
1302                 }
1303         }
1304
1305         for (i = 1; i < net_device->num_chn; i++)
1306                 netif_napi_add(net, &net_device->chan_table[i].napi,
1307                                netvsc_poll, NAPI_POLL_WEIGHT);
1308
1309         if (net_device->num_chn > 1)
1310                 schedule_work(&net_device->subchan_work);
1311
1312 out:
1313         /* if unavailable, just proceed with one queue */
1314         if (ret) {
1315                 net_device->max_chn = 1;
1316                 net_device->num_chn = 1;
1317         }
1318
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         net_dev->extension = NULL;
1335
1336         netvsc_device_remove(dev);
1337         kfree(rndis_dev);
1338 }
1339
1340 int rndis_filter_open(struct netvsc_device *nvdev)
1341 {
1342         if (!nvdev)
1343                 return -EINVAL;
1344
1345         if (atomic_inc_return(&nvdev->open_cnt) != 1)
1346                 return 0;
1347
1348         return rndis_filter_open_device(nvdev->extension);
1349 }
1350
1351 int rndis_filter_close(struct netvsc_device *nvdev)
1352 {
1353         if (!nvdev)
1354                 return -EINVAL;
1355
1356         if (atomic_dec_return(&nvdev->open_cnt) != 0)
1357                 return 0;
1358
1359         return rndis_filter_close_device(nvdev->extension);
1360 }
1361
1362 bool rndis_filter_opened(const struct netvsc_device *nvdev)
1363 {
1364         return atomic_read(&nvdev->open_cnt) > 0;
1365 }