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
  32 #include "hyperv_net.h"
  33
  34
  35 #define RNDIS_EXT_LEN PAGE_SIZE
  36 struct rndis_request {
  37         struct list_head list_ent;
  38         struct completion  wait_event;
  39
  40         struct rndis_message response_msg;
  41         /*
  42          * The buffer for extended info after the RNDIS response message. It's
  43          * referenced based on the data offset in the RNDIS message. Its size
  44          * is enough for current needs, and should be sufficient for the near
  45          * future.
  46          */
  47         u8 response_ext[RNDIS_EXT_LEN];
  48
  49         /* Simplify allocation by having a netvsc packet inline */
  50         struct hv_netvsc_packet pkt;
  51
  52         struct rndis_message request_msg;
  53         /*
  54          * The buffer for the extended info after the RNDIS request message.
  55          * It is referenced and sized in a similar way as response_ext.
  56          */
  57         u8 request_ext[RNDIS_EXT_LEN];
  58 };
  59
  60 static const u8 netvsc_hash_key[NETVSC_HASH_KEYLEN] = {
  61         0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
  62         0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
  63         0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
  64         0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
  65         0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
  66 };
  67
  68 static struct rndis_device *get_rndis_device(void)
  69 {
  70         struct rndis_device *device;
  71
  72         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  73         if (!device)
  74                 return NULL;
  75
  76         spin_lock_init(&device->request_lock);
  77
  78         INIT_LIST_HEAD(&device->req_list);
  79
  80         device->state = RNDIS_DEV_UNINITIALIZED;
  81
  82         return device;
  83 }
  84
  85 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  86                                              u32 msg_type,
  87                                              u32 msg_len)
  88 {
  89         struct rndis_request *request;
  90         struct rndis_message *rndis_msg;
  91         struct rndis_set_request *set;
  92         unsigned long flags;
  93
  94         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  95         if (!request)
  96                 return NULL;
  97
  98         init_completion(&request->wait_event);
  99
 100         rndis_msg = &request->request_msg;
 101         rndis_msg->ndis_msg_type = msg_type;
 102         rndis_msg->msg_len = msg_len;
 103
 104         request->pkt.q_idx = 0;
 105
 106         /*
 107          * Set the request id. This field is always after the rndis header for
 108          * request/response packet types so we just used the SetRequest as a
 109          * template
 110          */
 111         set = &rndis_msg->msg.set_req;
 112         set->req_id = atomic_inc_return(&dev->new_req_id);
 113
 114         /* Add to the request list */
 115         spin_lock_irqsave(&dev->request_lock, flags);
 116         list_add_tail(&request->list_ent, &dev->req_list);
 117         spin_unlock_irqrestore(&dev->request_lock, flags);
 118
 119         return request;
 120 }
 121
 122 static void put_rndis_request(struct rndis_device *dev,
 123                             struct rndis_request *req)
 124 {
 125         unsigned long flags;
 126
 127         spin_lock_irqsave(&dev->request_lock, flags);
 128         list_del(&req->list_ent);
 129         spin_unlock_irqrestore(&dev->request_lock, flags);
 130
 131         kfree(req);
 132 }
 133
 134 static void dump_rndis_message(struct hv_device *hv_dev,
 135                                const struct rndis_message *rndis_msg)
 136 {
 137         struct net_device *netdev = hv_get_drvdata(hv_dev);
 138
 139         switch (rndis_msg->ndis_msg_type) {
 140         case RNDIS_MSG_PACKET:
 141                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 142                            "data offset %u data len %u, # oob %u, "
 143                            "oob offset %u, oob len %u, pkt offset %u, "
 144                            "pkt len %u\n",
 145                            rndis_msg->msg_len,
 146                            rndis_msg->msg.pkt.data_offset,
 147                            rndis_msg->msg.pkt.data_len,
 148                            rndis_msg->msg.pkt.num_oob_data_elements,
 149                            rndis_msg->msg.pkt.oob_data_offset,
 150                            rndis_msg->msg.pkt.oob_data_len,
 151                            rndis_msg->msg.pkt.per_pkt_info_offset,
 152                            rndis_msg->msg.pkt.per_pkt_info_len);
 153                 break;
 154
 155         case RNDIS_MSG_INIT_C:
 156                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 157                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 158                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 159                         "pkt aligned %u)\n",
 160                         rndis_msg->msg_len,
 161                         rndis_msg->msg.init_complete.req_id,
 162                         rndis_msg->msg.init_complete.status,
 163                         rndis_msg->msg.init_complete.major_ver,
 164                         rndis_msg->msg.init_complete.minor_ver,
 165                         rndis_msg->msg.init_complete.dev_flags,
 166                         rndis_msg->msg.init_complete.max_xfer_size,
 167                         rndis_msg->msg.init_complete.
 168                            max_pkt_per_msg,
 169                         rndis_msg->msg.init_complete.
 170                            pkt_alignment_factor);
 171                 break;
 172
 173         case RNDIS_MSG_QUERY_C:
 174                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 175                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 176                         "buf offset %u)\n",
 177                         rndis_msg->msg_len,
 178                         rndis_msg->msg.query_complete.req_id,
 179                         rndis_msg->msg.query_complete.status,
 180                         rndis_msg->msg.query_complete.
 181                            info_buflen,
 182                         rndis_msg->msg.query_complete.
 183                            info_buf_offset);
 184                 break;
 185
 186         case RNDIS_MSG_SET_C:
 187                 netdev_dbg(netdev,
 188                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 189                         rndis_msg->msg_len,
 190                         rndis_msg->msg.set_complete.req_id,
 191                         rndis_msg->msg.set_complete.status);
 192                 break;
 193
 194         case RNDIS_MSG_INDICATE:
 195                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 196                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 197                         rndis_msg->msg_len,
 198                         rndis_msg->msg.indicate_status.status,
 199                         rndis_msg->msg.indicate_status.status_buflen,
 200                         rndis_msg->msg.indicate_status.status_buf_offset);
 201                 break;
 202
 203         default:
 204                 netdev_dbg(netdev, "0x%x (len %u)\n",
 205                         rndis_msg->ndis_msg_type,
 206                         rndis_msg->msg_len);
 207                 break;
 208         }
 209 }
 210
 211 static int rndis_filter_send_request(struct rndis_device *dev,
 212                                   struct rndis_request *req)
 213 {
 214         int ret;
 215         struct hv_netvsc_packet *packet;
 216         struct hv_page_buffer page_buf[2];
 217         struct hv_page_buffer *pb = page_buf;
 218         struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
 219
 220         /* Setup the packet to send it */
 221         packet = &req->pkt;
 222
 223         packet->total_data_buflen = req->request_msg.msg_len;
 224         packet->page_buf_cnt = 1;
 225
 226         pb[0].pfn = virt_to_phys(&req->request_msg) >>
 227                                         PAGE_SHIFT;
 228         pb[0].len = req->request_msg.msg_len;
 229         pb[0].offset =
 230                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 231
 232         /* Add one page_buf when request_msg crossing page boundary */
 233         if (pb[0].offset + pb[0].len > PAGE_SIZE) {
 234                 packet->page_buf_cnt++;
 235                 pb[0].len = PAGE_SIZE -
 236                         pb[0].offset;
 237                 pb[1].pfn = virt_to_phys((void *)&req->request_msg
 238                         + pb[0].len) >> PAGE_SHIFT;
 239                 pb[1].offset = 0;
 240                 pb[1].len = req->request_msg.msg_len -
 241                         pb[0].len;
 242         }
 243
 244         ret = netvsc_send(net_device_ctx->device_ctx, packet, NULL, &pb, NULL);
 245         return ret;
 246 }
 247
 248 static void rndis_set_link_state(struct rndis_device *rdev,
 249                                  struct rndis_request *request)
 250 {
 251         u32 link_status;
 252         struct rndis_query_complete *query_complete;
 253
 254         query_complete = &request->response_msg.msg.query_complete;
 255
 256         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 257             query_complete->info_buflen == sizeof(u32)) {
 258                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 259                        query_complete->info_buf_offset), sizeof(u32));
 260                 rdev->link_state = link_status != 0;
 261         }
 262 }
 263
 264 static void rndis_filter_receive_response(struct rndis_device *dev,
 265                                        struct rndis_message *resp)
 266 {
 267         struct rndis_request *request = NULL;
 268         bool found = false;
 269         unsigned long flags;
 270         struct net_device *ndev = dev->ndev;
 271
 272         spin_lock_irqsave(&dev->request_lock, flags);
 273         list_for_each_entry(request, &dev->req_list, list_ent) {
 274                 /*
 275                  * All request/response message contains RequestId as the 1st
 276                  * field
 277                  */
 278                 if (request->request_msg.msg.init_req.req_id
 279                     == resp->msg.init_complete.req_id) {
 280                         found = true;
 281                         break;
 282                 }
 283         }
 284         spin_unlock_irqrestore(&dev->request_lock, flags);
 285
 286         if (found) {
 287                 if (resp->msg_len <=
 288                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 289                         memcpy(&request->response_msg, resp,
 290                                resp->msg_len);
 291                         if (request->request_msg.ndis_msg_type ==
 292                             RNDIS_MSG_QUERY && request->request_msg.msg.
 293                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 294                                 rndis_set_link_state(dev, request);
 295                 } else {
 296                         netdev_err(ndev,
 297                                 "rndis response buffer overflow "
 298                                 "detected (size %u max %zu)\n",
 299                                 resp->msg_len,
 300                                 sizeof(struct rndis_message));
 301
 302                         if (resp->ndis_msg_type ==
 303                             RNDIS_MSG_RESET_C) {
 304                                 /* does not have a request id field */
 305                                 request->response_msg.msg.reset_complete.
 306                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 307                         } else {
 308                                 request->response_msg.msg.
 309                                 init_complete.status =
 310                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 311                         }
 312                 }
 313
 314                 complete(&request->wait_event);
 315         } else {
 316                 netdev_err(ndev,
 317                         "no rndis request found for this response "
 318                         "(id 0x%x res type 0x%x)\n",
 319                         resp->msg.init_complete.req_id,
 320                         resp->ndis_msg_type);
 321         }
 322 }
 323
 324 /*
 325  * Get the Per-Packet-Info with the specified type
 326  * return NULL if not found.
 327  */
 328 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 329 {
 330         struct rndis_per_packet_info *ppi;
 331         int len;
 332
 333         if (rpkt->per_pkt_info_offset == 0)
 334                 return NULL;
 335
 336         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 337                 rpkt->per_pkt_info_offset);
 338         len = rpkt->per_pkt_info_len;
 339
 340         while (len > 0) {
 341                 if (ppi->type == type)
 342                         return (void *)((ulong)ppi + ppi->ppi_offset);
 343                 len -= ppi->size;
 344                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 345         }
 346
 347         return NULL;
 348 }
 349
 350 static int rndis_filter_receive_data(struct net_device *ndev,
 351                                      struct rndis_device *dev,
 352                                      struct rndis_message *msg,
 353                                      struct vmbus_channel *channel,
 354                                      void *data, u32 data_buflen)
 355 {
 356         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 357         const struct ndis_tcp_ip_checksum_info *csum_info;
 358         const struct ndis_pkt_8021q_info *vlan;
 359         u32 data_offset;
 360
 361         /* Remove the rndis header and pass it back up the stack */
 362         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 363
 364         data_buflen -= data_offset;
 365
 366         /*
 367          * Make sure we got a valid RNDIS message, now total_data_buflen
 368          * should be the data packet size plus the trailer padding size
 369          */
 370         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 371                 netdev_err(dev->ndev, "rndis message buffer "
 372                            "overflow detected (got %u, min %u)"
 373                            "...dropping this message!\n",
 374                            data_buflen, rndis_pkt->data_len);
 375                 return NVSP_STAT_FAIL;
 376         }
 377
 378         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 379
 380         /*
 381          * Remove the rndis trailer padding from rndis packet message
 382          * rndis_pkt->data_len tell us the real data length, we only copy
 383          * the data packet to the stack, without the rndis trailer padding
 384          */
 385         data = (void *)((unsigned long)data + data_offset);
 386         csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
 387         return netvsc_recv_callback(ndev, channel,
 388                                     data, rndis_pkt->data_len,
 389                                     csum_info, vlan);
 390 }
 391
 392 int rndis_filter_receive(struct net_device *ndev,
 393                          struct netvsc_device *net_dev,
 394                          struct hv_device *dev,
 395                          struct vmbus_channel *channel,
 396                          void *data, u32 buflen)
 397 {
 398         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 399         struct rndis_device *rndis_dev = net_dev->extension;
 400         struct rndis_message *rndis_msg = data;
 401
 402         /* Make sure the rndis device state is initialized */
 403         if (unlikely(!rndis_dev)) {
 404                 netif_err(net_device_ctx, rx_err, ndev,
 405                           "got rndis message but no rndis device!\n");
 406                 return NVSP_STAT_FAIL;
 407         }
 408
 409         if (unlikely(rndis_dev->state == RNDIS_DEV_UNINITIALIZED)) {
 410                 netif_err(net_device_ctx, rx_err, ndev,
 411                           "got rndis message uninitialized\n");
 412                 return NVSP_STAT_FAIL;
 413         }
 414
 415         if (netif_msg_rx_status(net_device_ctx))
 416                 dump_rndis_message(dev, rndis_msg);
 417
 418         switch (rndis_msg->ndis_msg_type) {
 419         case RNDIS_MSG_PACKET:
 420                 return rndis_filter_receive_data(ndev, rndis_dev, rndis_msg,
 421                                                  channel, data, buflen);
 422         case RNDIS_MSG_INIT_C:
 423         case RNDIS_MSG_QUERY_C:
 424         case RNDIS_MSG_SET_C:
 425                 /* completion msgs */
 426                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 427                 break;
 428
 429         case RNDIS_MSG_INDICATE:
 430                 /* notification msgs */
 431                 netvsc_linkstatus_callback(dev, rndis_msg);
 432                 break;
 433         default:
 434                 netdev_err(ndev,
 435                         "unhandled rndis message (type %u len %u)\n",
 436                            rndis_msg->ndis_msg_type,
 437                            rndis_msg->msg_len);
 438                 break;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 445                                   void *result, u32 *result_size)
 446 {
 447         struct rndis_request *request;
 448         u32 inresult_size = *result_size;
 449         struct rndis_query_request *query;
 450         struct rndis_query_complete *query_complete;
 451         int ret = 0;
 452
 453         if (!result)
 454                 return -EINVAL;
 455
 456         *result_size = 0;
 457         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 458                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 459         if (!request) {
 460                 ret = -ENOMEM;
 461                 goto cleanup;
 462         }
 463
 464         /* Setup the rndis query */
 465         query = &request->request_msg.msg.query_req;
 466         query->oid = oid;
 467         query->info_buf_offset = sizeof(struct rndis_query_request);
 468         query->info_buflen = 0;
 469         query->dev_vc_handle = 0;
 470
 471         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 472                 struct net_device_context *ndevctx = netdev_priv(dev->ndev);
 473                 struct netvsc_device *nvdev = ndevctx->nvdev;
 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 ndis_offload *caps)
 543 {
 544         u32 caps_len = sizeof(*caps);
 545         int ret;
 546
 547         memset(caps, 0, sizeof(*caps));
 548
 549         ret = rndis_filter_query_device(dev,
 550                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 551                                         caps, &caps_len);
 552         if (ret)
 553                 return ret;
 554
 555         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 556                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 557                             caps->header.type);
 558                 return -EINVAL;
 559         }
 560
 561         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 562                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 563                             caps->header.revision);
 564                 return -EINVAL;
 565         }
 566
 567         if (caps->header.size > caps_len ||
 568             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 569                 netdev_warn(dev->ndev,
 570                             "invalid NDIS objsize %u, data size %u\n",
 571                             caps->header.size, caps_len);
 572                 return -EINVAL;
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 579 {
 580         u32 size = ETH_ALEN;
 581
 582         return rndis_filter_query_device(dev,
 583                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 584                                       dev->hw_mac_adr, &size);
 585 }
 586
 587 #define NWADR_STR "NetworkAddress"
 588 #define NWADR_STRLEN 14
 589
 590 int rndis_filter_set_device_mac(struct net_device *ndev, char *mac)
 591 {
 592         struct netvsc_device *nvdev = net_device_to_netvsc_device(ndev);
 593         struct rndis_device *rdev = nvdev->extension;
 594         struct rndis_request *request;
 595         struct rndis_set_request *set;
 596         struct rndis_config_parameter_info *cpi;
 597         wchar_t *cfg_nwadr, *cfg_mac;
 598         struct rndis_set_complete *set_complete;
 599         char macstr[2*ETH_ALEN+1];
 600         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 601                 2*NWADR_STRLEN + 4*ETH_ALEN;
 602         int ret;
 603
 604         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 605                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 606         if (!request)
 607                 return -ENOMEM;
 608
 609         set = &request->request_msg.msg.set_req;
 610         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 611         set->info_buflen = extlen;
 612         set->info_buf_offset = sizeof(struct rndis_set_request);
 613         set->dev_vc_handle = 0;
 614
 615         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 616                 set->info_buf_offset);
 617         cpi->parameter_name_offset =
 618                 sizeof(struct rndis_config_parameter_info);
 619         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 620         cpi->parameter_name_length = 2*NWADR_STRLEN;
 621         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 622         cpi->parameter_value_offset =
 623                 cpi->parameter_name_offset + cpi->parameter_name_length;
 624         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 625         cpi->parameter_value_length = 4*ETH_ALEN;
 626
 627         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 628         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 629         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 630                               cfg_nwadr, NWADR_STRLEN);
 631         if (ret < 0)
 632                 goto cleanup;
 633         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 634         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 635                               cfg_mac, 2*ETH_ALEN);
 636         if (ret < 0)
 637                 goto cleanup;
 638
 639         ret = rndis_filter_send_request(rdev, request);
 640         if (ret != 0)
 641                 goto cleanup;
 642
 643         wait_for_completion(&request->wait_event);
 644
 645         set_complete = &request->response_msg.msg.set_complete;
 646         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 647                 netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
 648                            set_complete->status);
 649                 ret = -EINVAL;
 650         }
 651
 652 cleanup:
 653         put_rndis_request(rdev, request);
 654         return ret;
 655 }
 656
 657 static int
 658 rndis_filter_set_offload_params(struct net_device *ndev,
 659                                 struct ndis_offload_params *req_offloads)
 660 {
 661         struct netvsc_device *nvdev = net_device_to_netvsc_device(ndev);
 662         struct rndis_device *rdev = nvdev->extension;
 663         struct rndis_request *request;
 664         struct rndis_set_request *set;
 665         struct ndis_offload_params *offload_params;
 666         struct rndis_set_complete *set_complete;
 667         u32 extlen = sizeof(struct ndis_offload_params);
 668         int ret;
 669         u32 vsp_version = nvdev->nvsp_version;
 670
 671         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 672                 extlen = VERSION_4_OFFLOAD_SIZE;
 673                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 674                  * UDP checksum offload.
 675                  */
 676                 req_offloads->udp_ip_v4_csum = 0;
 677                 req_offloads->udp_ip_v6_csum = 0;
 678         }
 679
 680         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 681                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 682         if (!request)
 683                 return -ENOMEM;
 684
 685         set = &request->request_msg.msg.set_req;
 686         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 687         set->info_buflen = extlen;
 688         set->info_buf_offset = sizeof(struct rndis_set_request);
 689         set->dev_vc_handle = 0;
 690
 691         offload_params = (struct ndis_offload_params *)((ulong)set +
 692                                 set->info_buf_offset);
 693         *offload_params = *req_offloads;
 694         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 695         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 696         offload_params->header.size = extlen;
 697
 698         ret = rndis_filter_send_request(rdev, request);
 699         if (ret != 0)
 700                 goto cleanup;
 701
 702         wait_for_completion(&request->wait_event);
 703         set_complete = &request->response_msg.msg.set_complete;
 704         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 705                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 706                            set_complete->status);
 707                 ret = -EINVAL;
 708         }
 709
 710 cleanup:
 711         put_rndis_request(rdev, request);
 712         return ret;
 713 }
 714
 715 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 716                                const u8 *rss_key, int num_queue)
 717 {
 718         struct net_device *ndev = rdev->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 = 0;
 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] = rdev->ind_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                 memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 772         else {
 773                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 774                            set_complete->status);
 775                 ret = -EINVAL;
 776         }
 777
 778 cleanup:
 779         put_rndis_request(rdev, request);
 780         return ret;
 781 }
 782
 783 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 784 {
 785         u32 size = sizeof(u32);
 786         u32 link_status;
 787         int ret;
 788
 789         ret = rndis_filter_query_device(dev,
 790                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 791                                       &link_status, &size);
 792
 793         return ret;
 794 }
 795
 796 static int rndis_filter_query_link_speed(struct rndis_device *dev)
 797 {
 798         u32 size = sizeof(u32);
 799         u32 link_speed;
 800         struct net_device_context *ndc;
 801         int ret;
 802
 803         ret = rndis_filter_query_device(dev, RNDIS_OID_GEN_LINK_SPEED,
 804                                         &link_speed, &size);
 805
 806         if (!ret) {
 807                 ndc = netdev_priv(dev->ndev);
 808
 809                 /* The link speed reported from host is in 100bps unit, so
 810                  * we convert it to Mbps here.
 811                  */
 812                 ndc->speed = link_speed / 10000;
 813         }
 814
 815         return ret;
 816 }
 817
 818 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 819 {
 820         struct rndis_request *request;
 821         struct rndis_set_request *set;
 822         int ret;
 823
 824         request = get_rndis_request(dev, RNDIS_MSG_SET,
 825                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 826                         sizeof(u32));
 827         if (!request)
 828                 return -ENOMEM;
 829
 830
 831         /* Setup the rndis set */
 832         set = &request->request_msg.msg.set_req;
 833         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 834         set->info_buflen = sizeof(u32);
 835         set->info_buf_offset = sizeof(struct rndis_set_request);
 836
 837         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 838                &new_filter, sizeof(u32));
 839
 840         ret = rndis_filter_send_request(dev, request);
 841         if (ret == 0)
 842                 wait_for_completion(&request->wait_event);
 843
 844         put_rndis_request(dev, request);
 845
 846         return ret;
 847 }
 848
 849 static int rndis_filter_init_device(struct rndis_device *dev)
 850 {
 851         struct rndis_request *request;
 852         struct rndis_initialize_request *init;
 853         struct rndis_initialize_complete *init_complete;
 854         u32 status;
 855         int ret;
 856         struct netvsc_device *nvdev = net_device_to_netvsc_device(dev->ndev);
 857
 858         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 859                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 860         if (!request) {
 861                 ret = -ENOMEM;
 862                 goto cleanup;
 863         }
 864
 865         /* Setup the rndis set */
 866         init = &request->request_msg.msg.init_req;
 867         init->major_ver = RNDIS_MAJOR_VERSION;
 868         init->minor_ver = RNDIS_MINOR_VERSION;
 869         init->max_xfer_size = 0x4000;
 870
 871         dev->state = RNDIS_DEV_INITIALIZING;
 872
 873         ret = rndis_filter_send_request(dev, request);
 874         if (ret != 0) {
 875                 dev->state = RNDIS_DEV_UNINITIALIZED;
 876                 goto cleanup;
 877         }
 878
 879         wait_for_completion(&request->wait_event);
 880
 881         init_complete = &request->response_msg.msg.init_complete;
 882         status = init_complete->status;
 883         if (status == RNDIS_STATUS_SUCCESS) {
 884                 dev->state = RNDIS_DEV_INITIALIZED;
 885                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 886                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 887                 ret = 0;
 888         } else {
 889                 dev->state = RNDIS_DEV_UNINITIALIZED;
 890                 ret = -EINVAL;
 891         }
 892
 893 cleanup:
 894         if (request)
 895                 put_rndis_request(dev, request);
 896
 897         return ret;
 898 }
 899
 900 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 901 {
 902         int i;
 903
 904         if (atomic_read(&nvdev->num_outstanding_recvs) > 0)
 905                 return false;
 906
 907         for (i = 0; i < nvdev->num_chn; i++) {
 908                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 909
 910                 if (atomic_read(&nvchan->queue_sends) > 0)
 911                         return false;
 912         }
 913
 914         return true;
 915 }
 916
 917 static void rndis_filter_halt_device(struct rndis_device *dev)
 918 {
 919         struct rndis_request *request;
 920         struct rndis_halt_request *halt;
 921         struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
 922         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 923
 924         /* Attempt to do a rndis device halt */
 925         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 926                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 927         if (!request)
 928                 goto cleanup;
 929
 930         /* Setup the rndis set */
 931         halt = &request->request_msg.msg.halt_req;
 932         halt->req_id = atomic_inc_return(&dev->new_req_id);
 933
 934         /* Ignore return since this msg is optional. */
 935         rndis_filter_send_request(dev, request);
 936
 937         dev->state = RNDIS_DEV_UNINITIALIZED;
 938
 939 cleanup:
 940         nvdev->destroy = true;
 941
 942         /* Force flag to be ordered before waiting */
 943         wmb();
 944
 945         /* Wait for all send completions */
 946         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
 947
 948         if (request)
 949                 put_rndis_request(dev, request);
 950 }
 951
 952 static int rndis_filter_open_device(struct rndis_device *dev)
 953 {
 954         int ret;
 955
 956         if (dev->state != RNDIS_DEV_INITIALIZED)
 957                 return 0;
 958
 959         ret = rndis_filter_set_packet_filter(dev,
 960                                          NDIS_PACKET_TYPE_BROADCAST |
 961                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 962                                          NDIS_PACKET_TYPE_DIRECTED);
 963         if (ret == 0)
 964                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 965
 966         return ret;
 967 }
 968
 969 static int rndis_filter_close_device(struct rndis_device *dev)
 970 {
 971         int ret;
 972
 973         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 974                 return 0;
 975
 976         ret = rndis_filter_set_packet_filter(dev, 0);
 977         if (ret == -ENODEV)
 978                 ret = 0;
 979
 980         if (ret == 0)
 981                 dev->state = RNDIS_DEV_INITIALIZED;
 982
 983         return ret;
 984 }
 985
 986 static void netvsc_sc_open(struct vmbus_channel *new_sc)
 987 {
 988         struct net_device *ndev =
 989                 hv_get_drvdata(new_sc->primary_channel->device_obj);
 990         struct netvsc_device *nvscdev = net_device_to_netvsc_device(ndev);
 991         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
 992         struct netvsc_channel *nvchan;
 993         int ret;
 994
 995         if (chn_index >= nvscdev->num_chn)
 996                 return;
 997
 998         nvchan = nvscdev->chan_table + chn_index;
 999         nvchan->mrc.buf
1000                 = vzalloc(NETVSC_RECVSLOT_MAX * sizeof(struct recv_comp_data));
1001
1002         if (!nvchan->mrc.buf)
1003                 return;
1004
1005         /* Because the device uses NAPI, all the interrupt batching and
1006          * control is done via Net softirq, not the channel handling
1007          */
1008         set_channel_read_mode(new_sc, HV_CALL_ISR);
1009
1010         /* Set the channel before opening.*/
1011         nvchan->channel = new_sc;
1012         netif_napi_add(ndev, &nvchan->napi,
1013                        netvsc_poll, NAPI_POLL_WEIGHT);
1014
1015         ret = vmbus_open(new_sc, nvscdev->ring_size * PAGE_SIZE,
1016                          nvscdev->ring_size * PAGE_SIZE, NULL, 0,
1017                          netvsc_channel_cb, nvchan);
1018         if (ret == 0)
1019                 napi_enable(&nvchan->napi);
1020         else
1021                 netif_napi_del(&nvchan->napi);
1022
1023         if (refcount_dec_and_test(&nvscdev->sc_offered))
1024                 complete(&nvscdev->channel_init_wait);
1025 }
1026
1027 int rndis_filter_device_add(struct hv_device *dev,
1028                             struct netvsc_device_info *device_info)
1029 {
1030         struct net_device *net = hv_get_drvdata(dev);
1031         struct net_device_context *net_device_ctx = netdev_priv(net);
1032         struct netvsc_device *net_device;
1033         struct rndis_device *rndis_device;
1034         struct ndis_offload hwcaps;
1035         struct ndis_offload_params offloads;
1036         struct nvsp_message *init_packet;
1037         struct ndis_recv_scale_cap rsscap;
1038         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1039         unsigned int gso_max_size = GSO_MAX_SIZE;
1040         u32 mtu, size, num_rss_qs;
1041         const struct cpumask *node_cpu_mask;
1042         u32 num_possible_rss_qs;
1043         int i, ret;
1044
1045         rndis_device = get_rndis_device();
1046         if (!rndis_device)
1047                 return -ENODEV;
1048
1049         /*
1050          * Let the inner driver handle this first to create the netvsc channel
1051          * NOTE! Once the channel is created, we may get a receive callback
1052          * (RndisFilterOnReceive()) before this call is completed
1053          */
1054         ret = netvsc_device_add(dev, device_info);
1055         if (ret != 0) {
1056                 kfree(rndis_device);
1057                 return ret;
1058         }
1059
1060         /* Initialize the rndis device */
1061         net_device = net_device_ctx->nvdev;
1062         net_device->max_chn = 1;
1063         net_device->num_chn = 1;
1064
1065         refcount_set(&net_device->sc_offered, 0);
1066
1067         net_device->extension = rndis_device;
1068         rndis_device->ndev = net;
1069
1070         /* Send the rndis initialization message */
1071         ret = rndis_filter_init_device(rndis_device);
1072         if (ret != 0) {
1073                 rndis_filter_device_remove(dev, net_device);
1074                 return ret;
1075         }
1076
1077         /* Get the MTU from the host */
1078         size = sizeof(u32);
1079         ret = rndis_filter_query_device(rndis_device,
1080                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1081                                         &mtu, &size);
1082         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1083                 net->mtu = mtu;
1084
1085         /* Get the mac address */
1086         ret = rndis_filter_query_device_mac(rndis_device);
1087         if (ret != 0) {
1088                 rndis_filter_device_remove(dev, net_device);
1089                 return ret;
1090         }
1091
1092         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1093
1094         /* Find HW offload capabilities */
1095         ret = rndis_query_hwcaps(rndis_device, &hwcaps);
1096         if (ret != 0) {
1097                 rndis_filter_device_remove(dev, net_device);
1098                 return ret;
1099         }
1100
1101         /* A value of zero means "no change"; now turn on what we want. */
1102         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1103
1104         /* Linux does not care about IP checksum, always does in kernel */
1105         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1106
1107         /* Compute tx offload settings based on hw capabilities */
1108         net->hw_features = NETIF_F_RXCSUM;
1109
1110         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1111                 /* Can checksum TCP */
1112                 net->hw_features |= NETIF_F_IP_CSUM;
1113                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1114
1115                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1116
1117                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1118                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1119                         net->hw_features |= NETIF_F_TSO;
1120
1121                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1122                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1123                 }
1124
1125                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1126                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1127                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1128                 }
1129         }
1130
1131         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1132                 net->hw_features |= NETIF_F_IPV6_CSUM;
1133
1134                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1135                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1136
1137                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1138                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1139                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1140                         net->hw_features |= NETIF_F_TSO6;
1141
1142                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1143                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1144                 }
1145
1146                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1147                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1148                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1149                 }
1150         }
1151
1152         netif_set_gso_max_size(net, gso_max_size);
1153
1154         ret = rndis_filter_set_offload_params(net, &offloads);
1155         if (ret)
1156                 goto err_dev_remv;
1157
1158         rndis_filter_query_device_link_status(rndis_device);
1159
1160         device_info->link_state = rndis_device->link_state;
1161
1162         netdev_dbg(net, "Device MAC %pM link state %s\n",
1163                    rndis_device->hw_mac_adr,
1164                    device_info->link_state ? "down" : "up");
1165
1166         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1167                 return 0;
1168
1169         rndis_filter_query_link_speed(rndis_device);
1170
1171         /* vRSS setup */
1172         memset(&rsscap, 0, rsscap_size);
1173         ret = rndis_filter_query_device(rndis_device,
1174                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1175                                         &rsscap, &rsscap_size);
1176         if (ret || rsscap.num_recv_que < 2)
1177                 goto out;
1178
1179         /*
1180          * We will limit the VRSS channels to the number CPUs in the NUMA node
1181          * the primary channel is currently bound to.
1182          *
1183          * This also guarantees that num_possible_rss_qs <= num_online_cpus
1184          */
1185         node_cpu_mask = cpumask_of_node(cpu_to_node(dev->channel->target_cpu));
1186         num_possible_rss_qs = min_t(u32, cpumask_weight(node_cpu_mask),
1187                                     rsscap.num_recv_que);
1188
1189         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1190
1191         /* We will use the given number of channels if available. */
1192         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1193
1194         for (i = 0; i < ITAB_NUM; i++)
1195                 rndis_device->ind_table[i] = ethtool_rxfh_indir_default(i,
1196                                                         net_device->num_chn);
1197
1198         num_rss_qs = net_device->num_chn - 1;
1199         if (num_rss_qs == 0)
1200                 return 0;
1201
1202         refcount_set(&net_device->sc_offered, num_rss_qs);
1203         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1204
1205         init_packet = &net_device->channel_init_pkt;
1206         memset(init_packet, 0, sizeof(struct nvsp_message));
1207         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1208         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1209         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1210                                                 net_device->num_chn - 1;
1211         ret = vmbus_sendpacket(dev->channel, init_packet,
1212                                sizeof(struct nvsp_message),
1213                                (unsigned long)init_packet,
1214                                VM_PKT_DATA_INBAND,
1215                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1216         if (ret)
1217                 goto out;
1218
1219         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1220                 ret = -ENODEV;
1221                 goto out;
1222         }
1223         wait_for_completion(&net_device->channel_init_wait);
1224
1225         net_device->num_chn = 1 +
1226                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1227
1228         /* ignore failues from setting rss parameters, still have channels */
1229         rndis_filter_set_rss_param(rndis_device, netvsc_hash_key,
1230                                    net_device->num_chn);
1231 out:
1232         if (ret) {
1233                 net_device->max_chn = 1;
1234                 net_device->num_chn = 1;
1235         }
1236
1237         return 0; /* return 0 because primary channel can be used alone */
1238
1239 err_dev_remv:
1240         rndis_filter_device_remove(dev, net_device);
1241         return ret;
1242 }
1243
1244 void rndis_filter_device_remove(struct hv_device *dev,
1245                                 struct netvsc_device *net_dev)
1246 {
1247         struct rndis_device *rndis_dev = net_dev->extension;
1248
1249         /* Halt and release the rndis device */
1250         rndis_filter_halt_device(rndis_dev);
1251
1252         kfree(rndis_dev);
1253         net_dev->extension = NULL;
1254
1255         netvsc_device_remove(dev);
1256 }
1257
1258 int rndis_filter_open(struct netvsc_device *nvdev)
1259 {
1260         if (!nvdev)
1261                 return -EINVAL;
1262
1263         if (atomic_inc_return(&nvdev->open_cnt) != 1)
1264                 return 0;
1265
1266         return rndis_filter_open_device(nvdev->extension);
1267 }
1268
1269 int rndis_filter_close(struct netvsc_device *nvdev)
1270 {
1271         if (!nvdev)
1272                 return -EINVAL;
1273
1274         if (atomic_dec_return(&nvdev->open_cnt) != 0)
1275                 return 0;
1276
1277         return rndis_filter_close_device(nvdev->extension);
1278 }