drivers/net/hyperv/rndis_filter.c

   1 /*
   2  * Copyright (c) 2009, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Authors:
  17  *   Haiyang Zhang <haiyangz@microsoft.com>
  18  *   Hank Janssen  <hjanssen@microsoft.com>
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/wait.h>
  23 #include <linux/highmem.h>
  24 #include <linux/slab.h>
  25 #include <linux/io.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/if_vlan.h>
  29 #include <linux/nls.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/rtnetlink.h>
  32 #include <linux/ucs2_string.h>
  33
  34 #include "hyperv_net.h"
  35 #include "netvsc_trace.h"
  36
  37 static void rndis_set_multicast(struct work_struct *w);
  38
  39 #define RNDIS_EXT_LEN PAGE_SIZE
  40 struct rndis_request {
  41         struct list_head list_ent;
  42         struct completion  wait_event;
  43
  44         struct rndis_message response_msg;
  45         /*
  46          * The buffer for extended info after the RNDIS response message. It's
  47          * referenced based on the data offset in the RNDIS message. Its size
  48          * is enough for current needs, and should be sufficient for the near
  49          * future.
  50          */
  51         u8 response_ext[RNDIS_EXT_LEN];
  52
  53         /* Simplify allocation by having a netvsc packet inline */
  54         struct hv_netvsc_packet pkt;
  55
  56         struct rndis_message request_msg;
  57         /*
  58          * The buffer for the extended info after the RNDIS request message.
  59          * It is referenced and sized in a similar way as response_ext.
  60          */
  61         u8 request_ext[RNDIS_EXT_LEN];
  62 };
  63
  64 static const u8 netvsc_hash_key[NETVSC_HASH_KEYLEN] = {
  65         0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
  66         0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
  67         0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
  68         0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
  69         0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
  70 };
  71
  72 static struct rndis_device *get_rndis_device(void)
  73 {
  74         struct rndis_device *device;
  75
  76         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  77         if (!device)
  78                 return NULL;
  79
  80         spin_lock_init(&device->request_lock);
  81
  82         INIT_LIST_HEAD(&device->req_list);
  83         INIT_WORK(&device->mcast_work, rndis_set_multicast);
  84
  85         device->state = RNDIS_DEV_UNINITIALIZED;
  86
  87         return device;
  88 }
  89
  90 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  91                                              u32 msg_type,
  92                                              u32 msg_len)
  93 {
  94         struct rndis_request *request;
  95         struct rndis_message *rndis_msg;
  96         struct rndis_set_request *set;
  97         unsigned long flags;
  98
  99         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
 100         if (!request)
 101                 return NULL;
 102
 103         init_completion(&request->wait_event);
 104
 105         rndis_msg = &request->request_msg;
 106         rndis_msg->ndis_msg_type = msg_type;
 107         rndis_msg->msg_len = msg_len;
 108
 109         request->pkt.q_idx = 0;
 110
 111         /*
 112          * Set the request id. This field is always after the rndis header for
 113          * request/response packet types so we just used the SetRequest as a
 114          * template
 115          */
 116         set = &rndis_msg->msg.set_req;
 117         set->req_id = atomic_inc_return(&dev->new_req_id);
 118
 119         /* Add to the request list */
 120         spin_lock_irqsave(&dev->request_lock, flags);
 121         list_add_tail(&request->list_ent, &dev->req_list);
 122         spin_unlock_irqrestore(&dev->request_lock, flags);
 123
 124         return request;
 125 }
 126
 127 static void put_rndis_request(struct rndis_device *dev,
 128                             struct rndis_request *req)
 129 {
 130         unsigned long flags;
 131
 132         spin_lock_irqsave(&dev->request_lock, flags);
 133         list_del(&req->list_ent);
 134         spin_unlock_irqrestore(&dev->request_lock, flags);
 135
 136         kfree(req);
 137 }
 138
 139 static void dump_rndis_message(struct net_device *netdev,
 140                                const struct rndis_message *rndis_msg)
 141 {
 142         switch (rndis_msg->ndis_msg_type) {
 143         case RNDIS_MSG_PACKET:
 144                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 145                            "data offset %u data len %u, # oob %u, "
 146                            "oob offset %u, oob len %u, pkt offset %u, "
 147                            "pkt len %u\n",
 148                            rndis_msg->msg_len,
 149                            rndis_msg->msg.pkt.data_offset,
 150                            rndis_msg->msg.pkt.data_len,
 151                            rndis_msg->msg.pkt.num_oob_data_elements,
 152                            rndis_msg->msg.pkt.oob_data_offset,
 153                            rndis_msg->msg.pkt.oob_data_len,
 154                            rndis_msg->msg.pkt.per_pkt_info_offset,
 155                            rndis_msg->msg.pkt.per_pkt_info_len);
 156                 break;
 157
 158         case RNDIS_MSG_INIT_C:
 159                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 160                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 161                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 162                         "pkt aligned %u)\n",
 163                         rndis_msg->msg_len,
 164                         rndis_msg->msg.init_complete.req_id,
 165                         rndis_msg->msg.init_complete.status,
 166                         rndis_msg->msg.init_complete.major_ver,
 167                         rndis_msg->msg.init_complete.minor_ver,
 168                         rndis_msg->msg.init_complete.dev_flags,
 169                         rndis_msg->msg.init_complete.max_xfer_size,
 170                         rndis_msg->msg.init_complete.
 171                            max_pkt_per_msg,
 172                         rndis_msg->msg.init_complete.
 173                            pkt_alignment_factor);
 174                 break;
 175
 176         case RNDIS_MSG_QUERY_C:
 177                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 178                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 179                         "buf offset %u)\n",
 180                         rndis_msg->msg_len,
 181                         rndis_msg->msg.query_complete.req_id,
 182                         rndis_msg->msg.query_complete.status,
 183                         rndis_msg->msg.query_complete.
 184                            info_buflen,
 185                         rndis_msg->msg.query_complete.
 186                            info_buf_offset);
 187                 break;
 188
 189         case RNDIS_MSG_SET_C:
 190                 netdev_dbg(netdev,
 191                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 192                         rndis_msg->msg_len,
 193                         rndis_msg->msg.set_complete.req_id,
 194                         rndis_msg->msg.set_complete.status);
 195                 break;
 196
 197         case RNDIS_MSG_INDICATE:
 198                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 199                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 200                         rndis_msg->msg_len,
 201                         rndis_msg->msg.indicate_status.status,
 202                         rndis_msg->msg.indicate_status.status_buflen,
 203                         rndis_msg->msg.indicate_status.status_buf_offset);
 204                 break;
 205
 206         default:
 207                 netdev_dbg(netdev, "0x%x (len %u)\n",
 208                         rndis_msg->ndis_msg_type,
 209                         rndis_msg->msg_len);
 210                 break;
 211         }
 212 }
 213
 214 static int rndis_filter_send_request(struct rndis_device *dev,
 215                                   struct rndis_request *req)
 216 {
 217         struct hv_netvsc_packet *packet;
 218         struct hv_page_buffer page_buf[2];
 219         struct hv_page_buffer *pb = page_buf;
 220         int ret;
 221
 222         /* Setup the packet to send it */
 223         packet = &req->pkt;
 224
 225         packet->total_data_buflen = req->request_msg.msg_len;
 226         packet->page_buf_cnt = 1;
 227
 228         pb[0].pfn = virt_to_phys(&req->request_msg) >>
 229                                         PAGE_SHIFT;
 230         pb[0].len = req->request_msg.msg_len;
 231         pb[0].offset =
 232                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 233
 234         /* Add one page_buf when request_msg crossing page boundary */
 235         if (pb[0].offset + pb[0].len > PAGE_SIZE) {
 236                 packet->page_buf_cnt++;
 237                 pb[0].len = PAGE_SIZE -
 238                         pb[0].offset;
 239                 pb[1].pfn = virt_to_phys((void *)&req->request_msg
 240                         + pb[0].len) >> PAGE_SHIFT;
 241                 pb[1].offset = 0;
 242                 pb[1].len = req->request_msg.msg_len -
 243                         pb[0].len;
 244         }
 245
 246         trace_rndis_send(dev->ndev, 0, &req->request_msg);
 247
 248         rcu_read_lock_bh();
 249         ret = netvsc_send(dev->ndev, packet, NULL, pb, NULL);
 250         rcu_read_unlock_bh();
 251
 252         return ret;
 253 }
 254
 255 static void rndis_set_link_state(struct rndis_device *rdev,
 256                                  struct rndis_request *request)
 257 {
 258         u32 link_status;
 259         struct rndis_query_complete *query_complete;
 260
 261         query_complete = &request->response_msg.msg.query_complete;
 262
 263         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 264             query_complete->info_buflen == sizeof(u32)) {
 265                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 266                        query_complete->info_buf_offset), sizeof(u32));
 267                 rdev->link_state = link_status != 0;
 268         }
 269 }
 270
 271 static void rndis_filter_receive_response(struct net_device *ndev,
 272                                           struct netvsc_device *nvdev,
 273                                           const struct rndis_message *resp)
 274 {
 275         struct rndis_device *dev = nvdev->extension;
 276         struct rndis_request *request = NULL;
 277         bool found = false;
 278         unsigned long flags;
 279
 280         /* This should never happen, it means control message
 281          * response received after device removed.
 282          */
 283         if (dev->state == RNDIS_DEV_UNINITIALIZED) {
 284                 netdev_err(ndev,
 285                            "got rndis message uninitialized\n");
 286                 return;
 287         }
 288
 289         spin_lock_irqsave(&dev->request_lock, flags);
 290         list_for_each_entry(request, &dev->req_list, list_ent) {
 291                 /*
 292                  * All request/response message contains RequestId as the 1st
 293                  * field
 294                  */
 295                 if (request->request_msg.msg.init_req.req_id
 296                     == resp->msg.init_complete.req_id) {
 297                         found = true;
 298                         break;
 299                 }
 300         }
 301         spin_unlock_irqrestore(&dev->request_lock, flags);
 302
 303         if (found) {
 304                 if (resp->msg_len <=
 305                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 306                         memcpy(&request->response_msg, resp,
 307                                resp->msg_len);
 308                         if (request->request_msg.ndis_msg_type ==
 309                             RNDIS_MSG_QUERY && request->request_msg.msg.
 310                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 311                                 rndis_set_link_state(dev, request);
 312                 } else {
 313                         netdev_err(ndev,
 314                                 "rndis response buffer overflow "
 315                                 "detected (size %u max %zu)\n",
 316                                 resp->msg_len,
 317                                 sizeof(struct rndis_message));
 318
 319                         if (resp->ndis_msg_type ==
 320                             RNDIS_MSG_RESET_C) {
 321                                 /* does not have a request id field */
 322                                 request->response_msg.msg.reset_complete.
 323                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 324                         } else {
 325                                 request->response_msg.msg.
 326                                 init_complete.status =
 327                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 328                         }
 329                 }
 330
 331                 complete(&request->wait_event);
 332         } else {
 333                 netdev_err(ndev,
 334                         "no rndis request found for this response "
 335                         "(id 0x%x res type 0x%x)\n",
 336                         resp->msg.init_complete.req_id,
 337                         resp->ndis_msg_type);
 338         }
 339 }
 340
 341 /*
 342  * Get the Per-Packet-Info with the specified type
 343  * return NULL if not found.
 344  */
 345 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 346 {
 347         struct rndis_per_packet_info *ppi;
 348         int len;
 349
 350         if (rpkt->per_pkt_info_offset == 0)
 351                 return NULL;
 352
 353         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 354                 rpkt->per_pkt_info_offset);
 355         len = rpkt->per_pkt_info_len;
 356
 357         while (len > 0) {
 358                 if (ppi->type == type)
 359                         return (void *)((ulong)ppi + ppi->ppi_offset);
 360                 len -= ppi->size;
 361                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 362         }
 363
 364         return NULL;
 365 }
 366
 367 static int rndis_filter_receive_data(struct net_device *ndev,
 368                                      struct netvsc_device *nvdev,
 369                                      struct vmbus_channel *channel,
 370                                      struct rndis_message *msg,
 371                                      u32 data_buflen)
 372 {
 373         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 374         const struct ndis_tcp_ip_checksum_info *csum_info;
 375         const struct ndis_pkt_8021q_info *vlan;
 376         u32 data_offset;
 377         void *data;
 378
 379         /* Remove the rndis header and pass it back up the stack */
 380         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 381
 382         data_buflen -= data_offset;
 383
 384         /*
 385          * Make sure we got a valid RNDIS message, now total_data_buflen
 386          * should be the data packet size plus the trailer padding size
 387          */
 388         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 389                 netdev_err(ndev, "rndis message buffer "
 390                            "overflow detected (got %u, min %u)"
 391                            "...dropping this message!\n",
 392                            data_buflen, rndis_pkt->data_len);
 393                 return NVSP_STAT_FAIL;
 394         }
 395
 396         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 397
 398         csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
 399
 400         data = (void *)msg + data_offset;
 401
 402         /*
 403          * Remove the rndis trailer padding from rndis packet message
 404          * rndis_pkt->data_len tell us the real data length, we only copy
 405          * the data packet to the stack, without the rndis trailer padding
 406          */
 407         return netvsc_recv_callback(ndev, nvdev, channel,
 408                                     data, rndis_pkt->data_len,
 409                                     csum_info, vlan);
 410 }
 411
 412 int rndis_filter_receive(struct net_device *ndev,
 413                          struct netvsc_device *net_dev,
 414                          struct vmbus_channel *channel,
 415                          void *data, u32 buflen)
 416 {
 417         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 418         struct rndis_message *rndis_msg = data;
 419
 420         if (netif_msg_rx_status(net_device_ctx))
 421                 dump_rndis_message(ndev, rndis_msg);
 422
 423         switch (rndis_msg->ndis_msg_type) {
 424         case RNDIS_MSG_PACKET:
 425                 return rndis_filter_receive_data(ndev, net_dev, channel,
 426                                                  rndis_msg, buflen);
 427         case RNDIS_MSG_INIT_C:
 428         case RNDIS_MSG_QUERY_C:
 429         case RNDIS_MSG_SET_C:
 430                 /* completion msgs */
 431                 rndis_filter_receive_response(ndev, net_dev, rndis_msg);
 432                 break;
 433
 434         case RNDIS_MSG_INDICATE:
 435                 /* notification msgs */
 436                 netvsc_linkstatus_callback(ndev, rndis_msg);
 437                 break;
 438         default:
 439                 netdev_err(ndev,
 440                         "unhandled rndis message (type %u len %u)\n",
 441                            rndis_msg->ndis_msg_type,
 442                            rndis_msg->msg_len);
 443                 return NVSP_STAT_FAIL;
 444         }
 445
 446         return NVSP_STAT_SUCCESS;
 447 }
 448
 449 static int rndis_filter_query_device(struct rndis_device *dev,
 450                                      struct netvsc_device *nvdev,
 451                                      u32 oid, void *result, u32 *result_size)
 452 {
 453         struct rndis_request *request;
 454         u32 inresult_size = *result_size;
 455         struct rndis_query_request *query;
 456         struct rndis_query_complete *query_complete;
 457         int ret = 0;
 458
 459         if (!result)
 460                 return -EINVAL;
 461
 462         *result_size = 0;
 463         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 464                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 465         if (!request) {
 466                 ret = -ENOMEM;
 467                 goto cleanup;
 468         }
 469
 470         /* Setup the rndis query */
 471         query = &request->request_msg.msg.query_req;
 472         query->oid = oid;
 473         query->info_buf_offset = sizeof(struct rndis_query_request);
 474         query->info_buflen = 0;
 475         query->dev_vc_handle = 0;
 476
 477         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 478                 struct ndis_offload *hwcaps;
 479                 u32 nvsp_version = nvdev->nvsp_version;
 480                 u8 ndis_rev;
 481                 size_t size;
 482
 483                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 484                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 485                         size = NDIS_OFFLOAD_SIZE;
 486                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 487                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 488                         size = NDIS_OFFLOAD_SIZE_6_1;
 489                 } else {
 490                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 491                         size = NDIS_OFFLOAD_SIZE_6_0;
 492                 }
 493
 494                 request->request_msg.msg_len += size;
 495                 query->info_buflen = size;
 496                 hwcaps = (struct ndis_offload *)
 497                         ((unsigned long)query + query->info_buf_offset);
 498
 499                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 500                 hwcaps->header.revision = ndis_rev;
 501                 hwcaps->header.size = size;
 502
 503         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 504                 struct ndis_recv_scale_cap *cap;
 505
 506                 request->request_msg.msg_len +=
 507                         sizeof(struct ndis_recv_scale_cap);
 508                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 509                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 510                                                      query->info_buf_offset);
 511                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 512                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 513                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 514         }
 515
 516         ret = rndis_filter_send_request(dev, request);
 517         if (ret != 0)
 518                 goto cleanup;
 519
 520         wait_for_completion(&request->wait_event);
 521
 522         /* Copy the response back */
 523         query_complete = &request->response_msg.msg.query_complete;
 524
 525         if (query_complete->info_buflen > inresult_size) {
 526                 ret = -1;
 527                 goto cleanup;
 528         }
 529
 530         memcpy(result,
 531                (void *)((unsigned long)query_complete +
 532                          query_complete->info_buf_offset),
 533                query_complete->info_buflen);
 534
 535         *result_size = query_complete->info_buflen;
 536
 537 cleanup:
 538         if (request)
 539                 put_rndis_request(dev, request);
 540
 541         return ret;
 542 }
 543
 544 /* Get the hardware offload capabilities */
 545 static int
 546 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 547                    struct ndis_offload *caps)
 548 {
 549         u32 caps_len = sizeof(*caps);
 550         int ret;
 551
 552         memset(caps, 0, sizeof(*caps));
 553
 554         ret = rndis_filter_query_device(dev, net_device,
 555                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 556                                         caps, &caps_len);
 557         if (ret)
 558                 return ret;
 559
 560         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 561                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 562                             caps->header.type);
 563                 return -EINVAL;
 564         }
 565
 566         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 567                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 568                             caps->header.revision);
 569                 return -EINVAL;
 570         }
 571
 572         if (caps->header.size > caps_len ||
 573             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 574                 netdev_warn(dev->ndev,
 575                             "invalid NDIS objsize %u, data size %u\n",
 576                             caps->header.size, caps_len);
 577                 return -EINVAL;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 584                                          struct netvsc_device *net_device)
 585 {
 586         u32 size = ETH_ALEN;
 587
 588         return rndis_filter_query_device(dev, net_device,
 589                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 590                                       dev->hw_mac_adr, &size);
 591 }
 592
 593 #define NWADR_STR "NetworkAddress"
 594 #define NWADR_STRLEN 14
 595
 596 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 597                                 const char *mac)
 598 {
 599         struct rndis_device *rdev = nvdev->extension;
 600         struct rndis_request *request;
 601         struct rndis_set_request *set;
 602         struct rndis_config_parameter_info *cpi;
 603         wchar_t *cfg_nwadr, *cfg_mac;
 604         struct rndis_set_complete *set_complete;
 605         char macstr[2*ETH_ALEN+1];
 606         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 607                 2*NWADR_STRLEN + 4*ETH_ALEN;
 608         int ret;
 609
 610         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 611                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 612         if (!request)
 613                 return -ENOMEM;
 614
 615         set = &request->request_msg.msg.set_req;
 616         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 617         set->info_buflen = extlen;
 618         set->info_buf_offset = sizeof(struct rndis_set_request);
 619         set->dev_vc_handle = 0;
 620
 621         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 622                 set->info_buf_offset);
 623         cpi->parameter_name_offset =
 624                 sizeof(struct rndis_config_parameter_info);
 625         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 626         cpi->parameter_name_length = 2*NWADR_STRLEN;
 627         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 628         cpi->parameter_value_offset =
 629                 cpi->parameter_name_offset + cpi->parameter_name_length;
 630         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 631         cpi->parameter_value_length = 4*ETH_ALEN;
 632
 633         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 634         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 635         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 636                               cfg_nwadr, NWADR_STRLEN);
 637         if (ret < 0)
 638                 goto cleanup;
 639         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 640         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 641                               cfg_mac, 2*ETH_ALEN);
 642         if (ret < 0)
 643                 goto cleanup;
 644
 645         ret = rndis_filter_send_request(rdev, request);
 646         if (ret != 0)
 647                 goto cleanup;
 648
 649         wait_for_completion(&request->wait_event);
 650
 651         set_complete = &request->response_msg.msg.set_complete;
 652         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 653                 ret = -EIO;
 654
 655 cleanup:
 656         put_rndis_request(rdev, request);
 657         return ret;
 658 }
 659
 660 static int
 661 rndis_filter_set_offload_params(struct net_device *ndev,
 662                                 struct netvsc_device *nvdev,
 663                                 struct ndis_offload_params *req_offloads)
 664 {
 665         struct rndis_device *rdev = nvdev->extension;
 666         struct rndis_request *request;
 667         struct rndis_set_request *set;
 668         struct ndis_offload_params *offload_params;
 669         struct rndis_set_complete *set_complete;
 670         u32 extlen = sizeof(struct ndis_offload_params);
 671         int ret;
 672         u32 vsp_version = nvdev->nvsp_version;
 673
 674         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 675                 extlen = VERSION_4_OFFLOAD_SIZE;
 676                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 677                  * UDP checksum offload.
 678                  */
 679                 req_offloads->udp_ip_v4_csum = 0;
 680                 req_offloads->udp_ip_v6_csum = 0;
 681         }
 682
 683         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 684                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 685         if (!request)
 686                 return -ENOMEM;
 687
 688         set = &request->request_msg.msg.set_req;
 689         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 690         set->info_buflen = extlen;
 691         set->info_buf_offset = sizeof(struct rndis_set_request);
 692         set->dev_vc_handle = 0;
 693
 694         offload_params = (struct ndis_offload_params *)((ulong)set +
 695                                 set->info_buf_offset);
 696         *offload_params = *req_offloads;
 697         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 698         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 699         offload_params->header.size = extlen;
 700
 701         ret = rndis_filter_send_request(rdev, request);
 702         if (ret != 0)
 703                 goto cleanup;
 704
 705         wait_for_completion(&request->wait_event);
 706         set_complete = &request->response_msg.msg.set_complete;
 707         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 708                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 709                            set_complete->status);
 710                 ret = -EINVAL;
 711         }
 712
 713 cleanup:
 714         put_rndis_request(rdev, request);
 715         return ret;
 716 }
 717
 718 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 719                                const u8 *rss_key)
 720 {
 721         struct net_device *ndev = rdev->ndev;
 722         struct rndis_request *request;
 723         struct rndis_set_request *set;
 724         struct rndis_set_complete *set_complete;
 725         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 726                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 727         struct ndis_recv_scale_param *rssp;
 728         u32 *itab;
 729         u8 *keyp;
 730         int i, ret;
 731
 732         request = get_rndis_request(
 733                         rdev, RNDIS_MSG_SET,
 734                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 735         if (!request)
 736                 return -ENOMEM;
 737
 738         set = &request->request_msg.msg.set_req;
 739         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 740         set->info_buflen = extlen;
 741         set->info_buf_offset = sizeof(struct rndis_set_request);
 742         set->dev_vc_handle = 0;
 743
 744         rssp = (struct ndis_recv_scale_param *)(set + 1);
 745         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 746         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 747         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 748         rssp->flag = 0;
 749         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 750                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 751                          NDIS_HASH_TCP_IPV6;
 752         rssp->indirect_tabsize = 4*ITAB_NUM;
 753         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 754         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 755         rssp->hashkey_offset = rssp->indirect_taboffset +
 756                                rssp->indirect_tabsize;
 757
 758         /* Set indirection table entries */
 759         itab = (u32 *)(rssp + 1);
 760         for (i = 0; i < ITAB_NUM; i++)
 761                 itab[i] = rdev->rx_table[i];
 762
 763         /* Set hask key values */
 764         keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
 765         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 766
 767         ret = rndis_filter_send_request(rdev, request);
 768         if (ret != 0)
 769                 goto cleanup;
 770
 771         wait_for_completion(&request->wait_event);
 772         set_complete = &request->response_msg.msg.set_complete;
 773         if (set_complete->status == RNDIS_STATUS_SUCCESS)
 774                 memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 775         else {
 776                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 777                            set_complete->status);
 778                 ret = -EINVAL;
 779         }
 780
 781 cleanup:
 782         put_rndis_request(rdev, request);
 783         return ret;
 784 }
 785
 786 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 787                                                  struct netvsc_device *net_device)
 788 {
 789         u32 size = sizeof(u32);
 790         u32 link_status;
 791
 792         return rndis_filter_query_device(dev, net_device,
 793                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 794                                          &link_status, &size);
 795 }
 796
 797 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 798                                          struct netvsc_device *net_device)
 799 {
 800         u32 size = sizeof(u32);
 801         u32 link_speed;
 802         struct net_device_context *ndc;
 803         int ret;
 804
 805         ret = rndis_filter_query_device(dev, net_device,
 806                                         RNDIS_OID_GEN_LINK_SPEED,
 807                                         &link_speed, &size);
 808
 809         if (!ret) {
 810                 ndc = netdev_priv(dev->ndev);
 811
 812                 /* The link speed reported from host is in 100bps unit, so
 813                  * we convert it to Mbps here.
 814                  */
 815                 ndc->speed = link_speed / 10000;
 816         }
 817
 818         return ret;
 819 }
 820
 821 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 822                                           u32 new_filter)
 823 {
 824         struct rndis_request *request;
 825         struct rndis_set_request *set;
 826         int ret;
 827
 828         if (dev->filter == new_filter)
 829                 return 0;
 830
 831         request = get_rndis_request(dev, RNDIS_MSG_SET,
 832                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 833                         sizeof(u32));
 834         if (!request)
 835                 return -ENOMEM;
 836
 837         /* Setup the rndis set */
 838         set = &request->request_msg.msg.set_req;
 839         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 840         set->info_buflen = sizeof(u32);
 841         set->info_buf_offset = sizeof(struct rndis_set_request);
 842
 843         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 844                &new_filter, sizeof(u32));
 845
 846         ret = rndis_filter_send_request(dev, request);
 847         if (ret == 0) {
 848                 wait_for_completion(&request->wait_event);
 849                 dev->filter = new_filter;
 850         }
 851
 852         put_rndis_request(dev, request);
 853
 854         return ret;
 855 }
 856
 857 static void rndis_set_multicast(struct work_struct *w)
 858 {
 859         struct rndis_device *rdev
 860                 = container_of(w, struct rndis_device, mcast_work);
 861         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
 862         unsigned int flags = rdev->ndev->flags;
 863
 864         if (flags & IFF_PROMISC) {
 865                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 866         } else {
 867                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 868                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 869                 if (flags & IFF_BROADCAST)
 870                         filter |= NDIS_PACKET_TYPE_BROADCAST;
 871         }
 872
 873         rndis_filter_set_packet_filter(rdev, filter);
 874 }
 875
 876 void rndis_filter_update(struct netvsc_device *nvdev)
 877 {
 878         struct rndis_device *rdev = nvdev->extension;
 879
 880         schedule_work(&rdev->mcast_work);
 881 }
 882
 883 static int rndis_filter_init_device(struct rndis_device *dev,
 884                                     struct netvsc_device *nvdev)
 885 {
 886         struct rndis_request *request;
 887         struct rndis_initialize_request *init;
 888         struct rndis_initialize_complete *init_complete;
 889         u32 status;
 890         int ret;
 891
 892         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 893                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 894         if (!request) {
 895                 ret = -ENOMEM;
 896                 goto cleanup;
 897         }
 898
 899         /* Setup the rndis set */
 900         init = &request->request_msg.msg.init_req;
 901         init->major_ver = RNDIS_MAJOR_VERSION;
 902         init->minor_ver = RNDIS_MINOR_VERSION;
 903         init->max_xfer_size = 0x4000;
 904
 905         dev->state = RNDIS_DEV_INITIALIZING;
 906
 907         ret = rndis_filter_send_request(dev, request);
 908         if (ret != 0) {
 909                 dev->state = RNDIS_DEV_UNINITIALIZED;
 910                 goto cleanup;
 911         }
 912
 913         wait_for_completion(&request->wait_event);
 914
 915         init_complete = &request->response_msg.msg.init_complete;
 916         status = init_complete->status;
 917         if (status == RNDIS_STATUS_SUCCESS) {
 918                 dev->state = RNDIS_DEV_INITIALIZED;
 919                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 920                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 921                 ret = 0;
 922         } else {
 923                 dev->state = RNDIS_DEV_UNINITIALIZED;
 924                 ret = -EINVAL;
 925         }
 926
 927 cleanup:
 928         if (request)
 929                 put_rndis_request(dev, request);
 930
 931         return ret;
 932 }
 933
 934 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 935 {
 936         int i;
 937
 938         for (i = 0; i < nvdev->num_chn; i++) {
 939                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 940
 941                 if (nvchan->mrc.first != nvchan->mrc.next)
 942                         return false;
 943
 944                 if (atomic_read(&nvchan->queue_sends) > 0)
 945                         return false;
 946         }
 947
 948         return true;
 949 }
 950
 951 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
 952                                      struct rndis_device *dev)
 953 {
 954         struct rndis_request *request;
 955         struct rndis_halt_request *halt;
 956
 957         /* Attempt to do a rndis device halt */
 958         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 959                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 960         if (!request)
 961                 goto cleanup;
 962
 963         /* Setup the rndis set */
 964         halt = &request->request_msg.msg.halt_req;
 965         halt->req_id = atomic_inc_return(&dev->new_req_id);
 966
 967         /* Ignore return since this msg is optional. */
 968         rndis_filter_send_request(dev, request);
 969
 970         dev->state = RNDIS_DEV_UNINITIALIZED;
 971
 972 cleanup:
 973         nvdev->destroy = true;
 974
 975         /* Force flag to be ordered before waiting */
 976         wmb();
 977
 978         /* Wait for all send completions */
 979         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
 980
 981         if (request)
 982                 put_rndis_request(dev, request);
 983 }
 984
 985 static int rndis_filter_open_device(struct rndis_device *dev)
 986 {
 987         int ret;
 988
 989         if (dev->state != RNDIS_DEV_INITIALIZED)
 990                 return 0;
 991
 992         ret = rndis_filter_set_packet_filter(dev,
 993                                          NDIS_PACKET_TYPE_BROADCAST |
 994                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 995                                          NDIS_PACKET_TYPE_DIRECTED);
 996         if (ret == 0)
 997                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 998
 999         return ret;
1000 }
1001
1002 static int rndis_filter_close_device(struct rndis_device *dev)
1003 {
1004         int ret;
1005
1006         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1007                 return 0;
1008
1009         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1010         cancel_work_sync(&dev->mcast_work);
1011
1012         ret = rndis_filter_set_packet_filter(dev, 0);
1013         if (ret == -ENODEV)
1014                 ret = 0;
1015
1016         if (ret == 0)
1017                 dev->state = RNDIS_DEV_INITIALIZED;
1018
1019         return ret;
1020 }
1021
1022 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1023 {
1024         struct net_device *ndev =
1025                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1026         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1027         struct netvsc_device *nvscdev;
1028         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1029         struct netvsc_channel *nvchan;
1030         int ret;
1031
1032         /* This is safe because this callback only happens when
1033          * new device is being setup and waiting on the channel_init_wait.
1034          */
1035         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1036         if (!nvscdev || chn_index >= nvscdev->num_chn)
1037                 return;
1038
1039         nvchan = nvscdev->chan_table + chn_index;
1040
1041         /* Because the device uses NAPI, all the interrupt batching and
1042          * control is done via Net softirq, not the channel handling
1043          */
1044         set_channel_read_mode(new_sc, HV_CALL_ISR);
1045
1046         /* Set the channel before opening.*/
1047         nvchan->channel = new_sc;
1048
1049         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1050                          netvsc_ring_bytes, NULL, 0,
1051                          netvsc_channel_cb, nvchan);
1052         if (ret == 0)
1053                 napi_enable(&nvchan->napi);
1054         else
1055                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1056
1057         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1058                 wake_up(&nvscdev->subchan_open);
1059 }
1060
1061 /* Open sub-channels after completing the handling of the device probe.
1062  * This breaks overlap of processing the host message for the
1063  * new primary channel with the initialization of sub-channels.
1064  */
1065 void rndis_set_subchannel(struct work_struct *w)
1066 {
1067         struct netvsc_device *nvdev
1068                 = container_of(w, struct netvsc_device, subchan_work);
1069         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1070         struct net_device_context *ndev_ctx;
1071         struct rndis_device *rdev;
1072         struct net_device *ndev;
1073         struct hv_device *hv_dev;
1074         int i, ret;
1075
1076         if (!rtnl_trylock()) {
1077                 schedule_work(w);
1078                 return;
1079         }
1080
1081         rdev = nvdev->extension;
1082         if (!rdev)
1083                 goto unlock;    /* device was removed */
1084
1085         ndev = rdev->ndev;
1086         ndev_ctx = netdev_priv(ndev);
1087         hv_dev = ndev_ctx->device_ctx;
1088
1089         memset(init_packet, 0, sizeof(struct nvsp_message));
1090         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1091         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1092         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1093                                                 nvdev->num_chn - 1;
1094         trace_nvsp_send(ndev, init_packet);
1095
1096         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1097                                sizeof(struct nvsp_message),
1098                                (unsigned long)init_packet,
1099                                VM_PKT_DATA_INBAND,
1100                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1101         if (ret) {
1102                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1103                 goto failed;
1104         }
1105
1106         wait_for_completion(&nvdev->channel_init_wait);
1107         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1108                 netdev_err(ndev, "sub channel request failed\n");
1109                 goto failed;
1110         }
1111
1112         nvdev->num_chn = 1 +
1113                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1114
1115         /* wait for all sub channels to open */
1116         wait_event(nvdev->subchan_open,
1117                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1118
1119         /* ignore failues from setting rss parameters, still have channels */
1120         rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1121
1122         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1123         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1124
1125         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1126                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1127
1128         netif_device_attach(ndev);
1129         rtnl_unlock();
1130         return;
1131
1132 failed:
1133         /* fallback to only primary channel */
1134         for (i = 1; i < nvdev->num_chn; i++)
1135                 netif_napi_del(&nvdev->chan_table[i].napi);
1136
1137         nvdev->max_chn = 1;
1138         nvdev->num_chn = 1;
1139
1140         netif_device_attach(ndev);
1141 unlock:
1142         rtnl_unlock();
1143 }
1144
1145 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1146                                    struct netvsc_device *nvdev)
1147 {
1148         struct net_device *net = rndis_device->ndev;
1149         struct net_device_context *net_device_ctx = netdev_priv(net);
1150         struct ndis_offload hwcaps;
1151         struct ndis_offload_params offloads;
1152         unsigned int gso_max_size = GSO_MAX_SIZE;
1153         int ret;
1154
1155         /* Find HW offload capabilities */
1156         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1157         if (ret != 0)
1158                 return ret;
1159
1160         /* A value of zero means "no change"; now turn on what we want. */
1161         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1162
1163         /* Linux does not care about IP checksum, always does in kernel */
1164         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1165
1166         /* Reset previously set hw_features flags */
1167         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1168         net_device_ctx->tx_checksum_mask = 0;
1169
1170         /* Compute tx offload settings based on hw capabilities */
1171         net->hw_features |= NETIF_F_RXCSUM;
1172
1173         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1174                 /* Can checksum TCP */
1175                 net->hw_features |= NETIF_F_IP_CSUM;
1176                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1177
1178                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1179
1180                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1181                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1182                         net->hw_features |= NETIF_F_TSO;
1183
1184                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1185                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1186                 }
1187
1188                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1189                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1190                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1191                 }
1192         }
1193
1194         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1195                 net->hw_features |= NETIF_F_IPV6_CSUM;
1196
1197                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1198                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1199
1200                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1201                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1202                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1203                         net->hw_features |= NETIF_F_TSO6;
1204
1205                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1206                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1207                 }
1208
1209                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1210                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1211                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1212                 }
1213         }
1214
1215         /* In case some hw_features disappeared we need to remove them from
1216          * net->features list as they're no longer supported.
1217          */
1218         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1219
1220         netif_set_gso_max_size(net, gso_max_size);
1221
1222         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1223
1224         return ret;
1225 }
1226
1227 static void rndis_get_friendly_name(struct net_device *net,
1228                                     struct rndis_device *rndis_device,
1229                                     struct netvsc_device *net_device)
1230 {
1231         ucs2_char_t wname[256];
1232         unsigned long len;
1233         u8 ifalias[256];
1234         u32 size;
1235
1236         size = sizeof(wname);
1237         if (rndis_filter_query_device(rndis_device, net_device,
1238                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1239                                       wname, &size) != 0)
1240                 return; /* ignore if host does not support */
1241
1242         if (size == 0)
1243                 return; /* name not set */
1244
1245         /* Convert Windows Unicode string to UTF-8 */
1246         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1247
1248         /* ignore the default value from host */
1249         if (strcmp(ifalias, "Network Adapter") != 0)
1250                 dev_set_alias(net, ifalias, len);
1251 }
1252
1253 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1254                                       struct netvsc_device_info *device_info)
1255 {
1256         struct net_device *net = hv_get_drvdata(dev);
1257         struct netvsc_device *net_device;
1258         struct rndis_device *rndis_device;
1259         struct ndis_recv_scale_cap rsscap;
1260         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1261         u32 mtu, size;
1262         u32 num_possible_rss_qs;
1263         int i, ret;
1264
1265         rndis_device = get_rndis_device();
1266         if (!rndis_device)
1267                 return ERR_PTR(-ENODEV);
1268
1269         /* Let the inner driver handle this first to create the netvsc channel
1270          * NOTE! Once the channel is created, we may get a receive callback
1271          * (RndisFilterOnReceive()) before this call is completed
1272          */
1273         net_device = netvsc_device_add(dev, device_info);
1274         if (IS_ERR(net_device)) {
1275                 kfree(rndis_device);
1276                 return net_device;
1277         }
1278
1279         /* Initialize the rndis device */
1280         net_device->max_chn = 1;
1281         net_device->num_chn = 1;
1282
1283         net_device->extension = rndis_device;
1284         rndis_device->ndev = net;
1285
1286         /* Send the rndis initialization message */
1287         ret = rndis_filter_init_device(rndis_device, net_device);
1288         if (ret != 0)
1289                 goto err_dev_remv;
1290
1291         /* Get the MTU from the host */
1292         size = sizeof(u32);
1293         ret = rndis_filter_query_device(rndis_device, net_device,
1294                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1295                                         &mtu, &size);
1296         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1297                 net->mtu = mtu;
1298
1299         /* Get the mac address */
1300         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1301         if (ret != 0)
1302                 goto err_dev_remv;
1303
1304         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1305
1306         /* Get friendly name as ifalias*/
1307         if (!net->ifalias)
1308                 rndis_get_friendly_name(net, rndis_device, net_device);
1309
1310         /* Query and set hardware capabilities */
1311         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1312         if (ret != 0)
1313                 goto err_dev_remv;
1314
1315         rndis_filter_query_device_link_status(rndis_device, net_device);
1316
1317         netdev_dbg(net, "Device MAC %pM link state %s\n",
1318                    rndis_device->hw_mac_adr,
1319                    rndis_device->link_state ? "down" : "up");
1320
1321         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1322                 goto out;
1323
1324         rndis_filter_query_link_speed(rndis_device, net_device);
1325
1326         /* vRSS setup */
1327         memset(&rsscap, 0, rsscap_size);
1328         ret = rndis_filter_query_device(rndis_device, net_device,
1329                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1330                                         &rsscap, &rsscap_size);
1331         if (ret || rsscap.num_recv_que < 2)
1332                 goto out;
1333
1334         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1335         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1336                                     rsscap.num_recv_que);
1337
1338         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1339
1340         /* We will use the given number of channels if available. */
1341         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1342
1343         for (i = 0; i < ITAB_NUM; i++)
1344                 rndis_device->rx_table[i] = ethtool_rxfh_indir_default(
1345                                                 i, net_device->num_chn);
1346
1347         atomic_set(&net_device->open_chn, 1);
1348         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1349
1350         for (i = 1; i < net_device->num_chn; i++) {
1351                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1352                 if (ret) {
1353                         while (--i != 0)
1354                                 vfree(net_device->chan_table[i].mrc.slots);
1355                         goto out;
1356                 }
1357         }
1358
1359         for (i = 1; i < net_device->num_chn; i++)
1360                 netif_napi_add(net, &net_device->chan_table[i].napi,
1361                                netvsc_poll, NAPI_POLL_WEIGHT);
1362
1363         if (net_device->num_chn > 1)
1364                 schedule_work(&net_device->subchan_work);
1365
1366 out:
1367         /* if unavailable, just proceed with one queue */
1368         if (ret) {
1369                 net_device->max_chn = 1;
1370                 net_device->num_chn = 1;
1371         }
1372
1373         /* No sub channels, device is ready */
1374         if (net_device->num_chn == 1)
1375                 netif_device_attach(net);
1376
1377         return net_device;
1378
1379 err_dev_remv:
1380         rndis_filter_device_remove(dev, net_device);
1381         return ERR_PTR(ret);
1382 }
1383
1384 void rndis_filter_device_remove(struct hv_device *dev,
1385                                 struct netvsc_device *net_dev)
1386 {
1387         struct rndis_device *rndis_dev = net_dev->extension;
1388
1389         /* Halt and release the rndis device */
1390         rndis_filter_halt_device(net_dev, rndis_dev);
1391
1392         net_dev->extension = NULL;
1393
1394         netvsc_device_remove(dev);
1395 }
1396
1397 int rndis_filter_open(struct netvsc_device *nvdev)
1398 {
1399         if (!nvdev)
1400                 return -EINVAL;
1401
1402         return rndis_filter_open_device(nvdev->extension);
1403 }
1404
1405 int rndis_filter_close(struct netvsc_device *nvdev)
1406 {
1407         if (!nvdev)
1408                 return -EINVAL;
1409
1410         return rndis_filter_close_device(nvdev->extension);
1411 }