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 static int rndis_set_rss_param_msg(struct rndis_device *rdev,
 719                                    const u8 *rss_key, u16 flag)
 720 {
 721         struct net_device *ndev = rdev->ndev;
 722         struct net_device_context *ndc = netdev_priv(ndev);
 723         struct rndis_request *request;
 724         struct rndis_set_request *set;
 725         struct rndis_set_complete *set_complete;
 726         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 727                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 728         struct ndis_recv_scale_param *rssp;
 729         u32 *itab;
 730         u8 *keyp;
 731         int i, ret;
 732
 733         request = get_rndis_request(
 734                         rdev, RNDIS_MSG_SET,
 735                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 736         if (!request)
 737                 return -ENOMEM;
 738
 739         set = &request->request_msg.msg.set_req;
 740         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 741         set->info_buflen = extlen;
 742         set->info_buf_offset = sizeof(struct rndis_set_request);
 743         set->dev_vc_handle = 0;
 744
 745         rssp = (struct ndis_recv_scale_param *)(set + 1);
 746         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 747         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 748         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 749         rssp->flag = flag;
 750         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 751                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 752                          NDIS_HASH_TCP_IPV6;
 753         rssp->indirect_tabsize = 4*ITAB_NUM;
 754         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 755         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 756         rssp->hashkey_offset = rssp->indirect_taboffset +
 757                                rssp->indirect_tabsize;
 758
 759         /* Set indirection table entries */
 760         itab = (u32 *)(rssp + 1);
 761         for (i = 0; i < ITAB_NUM; i++)
 762                 itab[i] = ndc->rx_table[i];
 763
 764         /* Set hask key values */
 765         keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
 766         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 767
 768         ret = rndis_filter_send_request(rdev, request);
 769         if (ret != 0)
 770                 goto cleanup;
 771
 772         wait_for_completion(&request->wait_event);
 773         set_complete = &request->response_msg.msg.set_complete;
 774         if (set_complete->status == RNDIS_STATUS_SUCCESS) {
 775                 if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
 776                     !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
 777                         memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 778
 779         } else {
 780                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 781                            set_complete->status);
 782                 ret = -EINVAL;
 783         }
 784
 785 cleanup:
 786         put_rndis_request(rdev, request);
 787         return ret;
 788 }
 789
 790 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 791                                const u8 *rss_key)
 792 {
 793         /* Disable RSS before change */
 794         rndis_set_rss_param_msg(rdev, rss_key,
 795                                 NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
 796
 797         return rndis_set_rss_param_msg(rdev, rss_key, 0);
 798 }
 799
 800 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 801                                                  struct netvsc_device *net_device)
 802 {
 803         u32 size = sizeof(u32);
 804         u32 link_status;
 805
 806         return rndis_filter_query_device(dev, net_device,
 807                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 808                                          &link_status, &size);
 809 }
 810
 811 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 812                                          struct netvsc_device *net_device)
 813 {
 814         u32 size = sizeof(u32);
 815         u32 link_speed;
 816         struct net_device_context *ndc;
 817         int ret;
 818
 819         ret = rndis_filter_query_device(dev, net_device,
 820                                         RNDIS_OID_GEN_LINK_SPEED,
 821                                         &link_speed, &size);
 822
 823         if (!ret) {
 824                 ndc = netdev_priv(dev->ndev);
 825
 826                 /* The link speed reported from host is in 100bps unit, so
 827                  * we convert it to Mbps here.
 828                  */
 829                 ndc->speed = link_speed / 10000;
 830         }
 831
 832         return ret;
 833 }
 834
 835 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 836                                           u32 new_filter)
 837 {
 838         struct rndis_request *request;
 839         struct rndis_set_request *set;
 840         int ret;
 841
 842         if (dev->filter == new_filter)
 843                 return 0;
 844
 845         request = get_rndis_request(dev, RNDIS_MSG_SET,
 846                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 847                         sizeof(u32));
 848         if (!request)
 849                 return -ENOMEM;
 850
 851         /* Setup the rndis set */
 852         set = &request->request_msg.msg.set_req;
 853         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 854         set->info_buflen = sizeof(u32);
 855         set->info_buf_offset = sizeof(struct rndis_set_request);
 856
 857         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 858                &new_filter, sizeof(u32));
 859
 860         ret = rndis_filter_send_request(dev, request);
 861         if (ret == 0) {
 862                 wait_for_completion(&request->wait_event);
 863                 dev->filter = new_filter;
 864         }
 865
 866         put_rndis_request(dev, request);
 867
 868         return ret;
 869 }
 870
 871 static void rndis_set_multicast(struct work_struct *w)
 872 {
 873         struct rndis_device *rdev
 874                 = container_of(w, struct rndis_device, mcast_work);
 875         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
 876         unsigned int flags = rdev->ndev->flags;
 877
 878         if (flags & IFF_PROMISC) {
 879                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 880         } else {
 881                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 882                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 883                 if (flags & IFF_BROADCAST)
 884                         filter |= NDIS_PACKET_TYPE_BROADCAST;
 885         }
 886
 887         rndis_filter_set_packet_filter(rdev, filter);
 888 }
 889
 890 void rndis_filter_update(struct netvsc_device *nvdev)
 891 {
 892         struct rndis_device *rdev = nvdev->extension;
 893
 894         schedule_work(&rdev->mcast_work);
 895 }
 896
 897 static int rndis_filter_init_device(struct rndis_device *dev,
 898                                     struct netvsc_device *nvdev)
 899 {
 900         struct rndis_request *request;
 901         struct rndis_initialize_request *init;
 902         struct rndis_initialize_complete *init_complete;
 903         u32 status;
 904         int ret;
 905
 906         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 907                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 908         if (!request) {
 909                 ret = -ENOMEM;
 910                 goto cleanup;
 911         }
 912
 913         /* Setup the rndis set */
 914         init = &request->request_msg.msg.init_req;
 915         init->major_ver = RNDIS_MAJOR_VERSION;
 916         init->minor_ver = RNDIS_MINOR_VERSION;
 917         init->max_xfer_size = 0x4000;
 918
 919         dev->state = RNDIS_DEV_INITIALIZING;
 920
 921         ret = rndis_filter_send_request(dev, request);
 922         if (ret != 0) {
 923                 dev->state = RNDIS_DEV_UNINITIALIZED;
 924                 goto cleanup;
 925         }
 926
 927         wait_for_completion(&request->wait_event);
 928
 929         init_complete = &request->response_msg.msg.init_complete;
 930         status = init_complete->status;
 931         if (status == RNDIS_STATUS_SUCCESS) {
 932                 dev->state = RNDIS_DEV_INITIALIZED;
 933                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 934                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 935                 ret = 0;
 936         } else {
 937                 dev->state = RNDIS_DEV_UNINITIALIZED;
 938                 ret = -EINVAL;
 939         }
 940
 941 cleanup:
 942         if (request)
 943                 put_rndis_request(dev, request);
 944
 945         return ret;
 946 }
 947
 948 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 949 {
 950         int i;
 951
 952         for (i = 0; i < nvdev->num_chn; i++) {
 953                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 954
 955                 if (nvchan->mrc.first != nvchan->mrc.next)
 956                         return false;
 957
 958                 if (atomic_read(&nvchan->queue_sends) > 0)
 959                         return false;
 960         }
 961
 962         return true;
 963 }
 964
 965 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
 966                                      struct rndis_device *dev)
 967 {
 968         struct rndis_request *request;
 969         struct rndis_halt_request *halt;
 970
 971         /* Attempt to do a rndis device halt */
 972         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 973                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 974         if (!request)
 975                 goto cleanup;
 976
 977         /* Setup the rndis set */
 978         halt = &request->request_msg.msg.halt_req;
 979         halt->req_id = atomic_inc_return(&dev->new_req_id);
 980
 981         /* Ignore return since this msg is optional. */
 982         rndis_filter_send_request(dev, request);
 983
 984         dev->state = RNDIS_DEV_UNINITIALIZED;
 985
 986 cleanup:
 987         nvdev->destroy = true;
 988
 989         /* Force flag to be ordered before waiting */
 990         wmb();
 991
 992         /* Wait for all send completions */
 993         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
 994
 995         if (request)
 996                 put_rndis_request(dev, request);
 997 }
 998
 999 static int rndis_filter_open_device(struct rndis_device *dev)
1000 {
1001         int ret;
1002
1003         if (dev->state != RNDIS_DEV_INITIALIZED)
1004                 return 0;
1005
1006         ret = rndis_filter_set_packet_filter(dev,
1007                                          NDIS_PACKET_TYPE_BROADCAST |
1008                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1009                                          NDIS_PACKET_TYPE_DIRECTED);
1010         if (ret == 0)
1011                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1012
1013         return ret;
1014 }
1015
1016 static int rndis_filter_close_device(struct rndis_device *dev)
1017 {
1018         int ret;
1019
1020         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1021                 return 0;
1022
1023         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1024         cancel_work_sync(&dev->mcast_work);
1025
1026         ret = rndis_filter_set_packet_filter(dev, 0);
1027         if (ret == -ENODEV)
1028                 ret = 0;
1029
1030         if (ret == 0)
1031                 dev->state = RNDIS_DEV_INITIALIZED;
1032
1033         return ret;
1034 }
1035
1036 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1037 {
1038         struct net_device *ndev =
1039                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1040         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1041         struct netvsc_device *nvscdev;
1042         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1043         struct netvsc_channel *nvchan;
1044         int ret;
1045
1046         /* This is safe because this callback only happens when
1047          * new device is being setup and waiting on the channel_init_wait.
1048          */
1049         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1050         if (!nvscdev || chn_index >= nvscdev->num_chn)
1051                 return;
1052
1053         nvchan = nvscdev->chan_table + chn_index;
1054
1055         /* Because the device uses NAPI, all the interrupt batching and
1056          * control is done via Net softirq, not the channel handling
1057          */
1058         set_channel_read_mode(new_sc, HV_CALL_ISR);
1059
1060         /* Set the channel before opening.*/
1061         nvchan->channel = new_sc;
1062
1063         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1064                          netvsc_ring_bytes, NULL, 0,
1065                          netvsc_channel_cb, nvchan);
1066         if (ret == 0)
1067                 napi_enable(&nvchan->napi);
1068         else
1069                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1070
1071         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1072                 wake_up(&nvscdev->subchan_open);
1073 }
1074
1075 /* Open sub-channels after completing the handling of the device probe.
1076  * This breaks overlap of processing the host message for the
1077  * new primary channel with the initialization of sub-channels.
1078  */
1079 int rndis_set_subchannel(struct net_device *ndev,
1080                          struct netvsc_device *nvdev,
1081                          struct netvsc_device_info *dev_info)
1082 {
1083         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1084         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1085         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1086         struct rndis_device *rdev = nvdev->extension;
1087         int i, ret;
1088
1089         ASSERT_RTNL();
1090
1091         memset(init_packet, 0, sizeof(struct nvsp_message));
1092         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1093         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1094         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1095                                                 nvdev->num_chn - 1;
1096         trace_nvsp_send(ndev, init_packet);
1097
1098         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1099                                sizeof(struct nvsp_message),
1100                                (unsigned long)init_packet,
1101                                VM_PKT_DATA_INBAND,
1102                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1103         if (ret) {
1104                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1105                 return ret;
1106         }
1107
1108         wait_for_completion(&nvdev->channel_init_wait);
1109         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1110                 netdev_err(ndev, "sub channel request failed\n");
1111                 return -EIO;
1112         }
1113
1114         nvdev->num_chn = 1 +
1115                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1116
1117         /* wait for all sub channels to open */
1118         wait_event(nvdev->subchan_open,
1119                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1120
1121         /* ignore failues from setting rss parameters, still have channels */
1122         if (dev_info)
1123                 rndis_filter_set_rss_param(rdev, dev_info->rss_key);
1124         else
1125                 rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1126
1127         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1128         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1129
1130         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1131                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1132
1133         return 0;
1134 }
1135
1136 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1137                                    struct netvsc_device *nvdev)
1138 {
1139         struct net_device *net = rndis_device->ndev;
1140         struct net_device_context *net_device_ctx = netdev_priv(net);
1141         struct ndis_offload hwcaps;
1142         struct ndis_offload_params offloads;
1143         unsigned int gso_max_size = GSO_MAX_SIZE;
1144         int ret;
1145
1146         /* Find HW offload capabilities */
1147         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1148         if (ret != 0)
1149                 return ret;
1150
1151         /* A value of zero means "no change"; now turn on what we want. */
1152         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1153
1154         /* Linux does not care about IP checksum, always does in kernel */
1155         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1156
1157         /* Reset previously set hw_features flags */
1158         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1159         net_device_ctx->tx_checksum_mask = 0;
1160
1161         /* Compute tx offload settings based on hw capabilities */
1162         net->hw_features |= NETIF_F_RXCSUM;
1163
1164         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1165                 /* Can checksum TCP */
1166                 net->hw_features |= NETIF_F_IP_CSUM;
1167                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1168
1169                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1170
1171                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1172                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1173                         net->hw_features |= NETIF_F_TSO;
1174
1175                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1176                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1177                 }
1178
1179                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1180                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1181                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1182                 }
1183         }
1184
1185         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1186                 net->hw_features |= NETIF_F_IPV6_CSUM;
1187
1188                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1189                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1190
1191                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1192                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1193                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1194                         net->hw_features |= NETIF_F_TSO6;
1195
1196                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1197                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1198                 }
1199
1200                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1201                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1202                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1203                 }
1204         }
1205
1206         /* In case some hw_features disappeared we need to remove them from
1207          * net->features list as they're no longer supported.
1208          */
1209         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1210
1211         netif_set_gso_max_size(net, gso_max_size);
1212
1213         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1214
1215         return ret;
1216 }
1217
1218 static void rndis_get_friendly_name(struct net_device *net,
1219                                     struct rndis_device *rndis_device,
1220                                     struct netvsc_device *net_device)
1221 {
1222         ucs2_char_t wname[256];
1223         unsigned long len;
1224         u8 ifalias[256];
1225         u32 size;
1226
1227         size = sizeof(wname);
1228         if (rndis_filter_query_device(rndis_device, net_device,
1229                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1230                                       wname, &size) != 0)
1231                 return; /* ignore if host does not support */
1232
1233         if (size == 0)
1234                 return; /* name not set */
1235
1236         /* Convert Windows Unicode string to UTF-8 */
1237         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1238
1239         /* ignore the default value from host */
1240         if (strcmp(ifalias, "Network Adapter") != 0)
1241                 dev_set_alias(net, ifalias, len);
1242 }
1243
1244 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1245                                       struct netvsc_device_info *device_info)
1246 {
1247         struct net_device *net = hv_get_drvdata(dev);
1248         struct net_device_context *ndc = netdev_priv(net);
1249         struct netvsc_device *net_device;
1250         struct rndis_device *rndis_device;
1251         struct ndis_recv_scale_cap rsscap;
1252         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1253         u32 mtu, size;
1254         u32 num_possible_rss_qs;
1255         int i, ret;
1256
1257         rndis_device = get_rndis_device();
1258         if (!rndis_device)
1259                 return ERR_PTR(-ENODEV);
1260
1261         /* Let the inner driver handle this first to create the netvsc channel
1262          * NOTE! Once the channel is created, we may get a receive callback
1263          * (RndisFilterOnReceive()) before this call is completed
1264          */
1265         net_device = netvsc_device_add(dev, device_info);
1266         if (IS_ERR(net_device)) {
1267                 kfree(rndis_device);
1268                 return net_device;
1269         }
1270
1271         /* Initialize the rndis device */
1272         net_device->max_chn = 1;
1273         net_device->num_chn = 1;
1274
1275         net_device->extension = rndis_device;
1276         rndis_device->ndev = net;
1277
1278         /* Send the rndis initialization message */
1279         ret = rndis_filter_init_device(rndis_device, net_device);
1280         if (ret != 0)
1281                 goto err_dev_remv;
1282
1283         /* Get the MTU from the host */
1284         size = sizeof(u32);
1285         ret = rndis_filter_query_device(rndis_device, net_device,
1286                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1287                                         &mtu, &size);
1288         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1289                 net->mtu = mtu;
1290
1291         /* Get the mac address */
1292         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1293         if (ret != 0)
1294                 goto err_dev_remv;
1295
1296         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1297
1298         /* Get friendly name as ifalias*/
1299         if (!net->ifalias)
1300                 rndis_get_friendly_name(net, rndis_device, net_device);
1301
1302         /* Query and set hardware capabilities */
1303         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1304         if (ret != 0)
1305                 goto err_dev_remv;
1306
1307         rndis_filter_query_device_link_status(rndis_device, net_device);
1308
1309         netdev_dbg(net, "Device MAC %pM link state %s\n",
1310                    rndis_device->hw_mac_adr,
1311                    rndis_device->link_state ? "down" : "up");
1312
1313         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1314                 goto out;
1315
1316         rndis_filter_query_link_speed(rndis_device, net_device);
1317
1318         /* vRSS setup */
1319         memset(&rsscap, 0, rsscap_size);
1320         ret = rndis_filter_query_device(rndis_device, net_device,
1321                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1322                                         &rsscap, &rsscap_size);
1323         if (ret || rsscap.num_recv_que < 2)
1324                 goto out;
1325
1326         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1327         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1328                                     rsscap.num_recv_que);
1329
1330         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1331
1332         /* We will use the given number of channels if available. */
1333         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1334
1335         if (!netif_is_rxfh_configured(net)) {
1336                 for (i = 0; i < ITAB_NUM; i++)
1337                         ndc->rx_table[i] = ethtool_rxfh_indir_default(
1338                                                 i, net_device->num_chn);
1339         }
1340
1341         atomic_set(&net_device->open_chn, 1);
1342         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1343
1344         for (i = 1; i < net_device->num_chn; i++) {
1345                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1346                 if (ret) {
1347                         while (--i != 0)
1348                                 vfree(net_device->chan_table[i].mrc.slots);
1349                         goto out;
1350                 }
1351         }
1352
1353         for (i = 1; i < net_device->num_chn; i++)
1354                 netif_napi_add(net, &net_device->chan_table[i].napi,
1355                                netvsc_poll, NAPI_POLL_WEIGHT);
1356
1357         return net_device;
1358
1359 out:
1360         /* setting up multiple channels failed */
1361         net_device->max_chn = 1;
1362         net_device->num_chn = 1;
1363         return net_device;
1364
1365 err_dev_remv:
1366         rndis_filter_device_remove(dev, net_device);
1367         return ERR_PTR(ret);
1368 }
1369
1370 void rndis_filter_device_remove(struct hv_device *dev,
1371                                 struct netvsc_device *net_dev)
1372 {
1373         struct rndis_device *rndis_dev = net_dev->extension;
1374
1375         /* Halt and release the rndis device */
1376         rndis_filter_halt_device(net_dev, rndis_dev);
1377
1378         netvsc_device_remove(dev);
1379 }
1380
1381 int rndis_filter_open(struct netvsc_device *nvdev)
1382 {
1383         if (!nvdev)
1384                 return -EINVAL;
1385
1386         return rndis_filter_open_device(nvdev->extension);
1387 }
1388
1389 int rndis_filter_close(struct netvsc_device *nvdev)
1390 {
1391         if (!nvdev)
1392                 return -EINVAL;
1393
1394         return rndis_filter_close_device(nvdev->extension);
1395 }