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,
 346                                   u32 type, u8 internal)
 347 {
 348         struct rndis_per_packet_info *ppi;
 349         int len;
 350
 351         if (rpkt->per_pkt_info_offset == 0)
 352                 return NULL;
 353
 354         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 355                 rpkt->per_pkt_info_offset);
 356         len = rpkt->per_pkt_info_len;
 357
 358         while (len > 0) {
 359                 if (ppi->type == type && ppi->internal == internal)
 360                         return (void *)((ulong)ppi + ppi->ppi_offset);
 361                 len -= ppi->size;
 362                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 363         }
 364
 365         return NULL;
 366 }
 367
 368 static inline
 369 void rsc_add_data(struct netvsc_channel *nvchan,
 370                   const struct ndis_pkt_8021q_info *vlan,
 371                   const struct ndis_tcp_ip_checksum_info *csum_info,
 372                   void *data, u32 len)
 373 {
 374         u32 cnt = nvchan->rsc.cnt;
 375
 376         if (cnt) {
 377                 nvchan->rsc.pktlen += len;
 378         } else {
 379                 nvchan->rsc.vlan = vlan;
 380                 nvchan->rsc.csum_info = csum_info;
 381                 nvchan->rsc.pktlen = len;
 382         }
 383
 384         nvchan->rsc.data[cnt] = data;
 385         nvchan->rsc.len[cnt] = len;
 386         nvchan->rsc.cnt++;
 387 }
 388
 389 static int rndis_filter_receive_data(struct net_device *ndev,
 390                                      struct netvsc_device *nvdev,
 391                                      struct netvsc_channel *nvchan,
 392                                      struct rndis_message *msg,
 393                                      u32 data_buflen)
 394 {
 395         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 396         const struct ndis_tcp_ip_checksum_info *csum_info;
 397         const struct ndis_pkt_8021q_info *vlan;
 398         const struct rndis_pktinfo_id *pktinfo_id;
 399         u32 data_offset;
 400         void *data;
 401         bool rsc_more = false;
 402         int ret;
 403
 404         /* Remove the rndis header and pass it back up the stack */
 405         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 406
 407         data_buflen -= data_offset;
 408
 409         /*
 410          * Make sure we got a valid RNDIS message, now total_data_buflen
 411          * should be the data packet size plus the trailer padding size
 412          */
 413         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 414                 netdev_err(ndev, "rndis message buffer "
 415                            "overflow detected (got %u, min %u)"
 416                            "...dropping this message!\n",
 417                            data_buflen, rndis_pkt->data_len);
 418                 return NVSP_STAT_FAIL;
 419         }
 420
 421         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO, 0);
 422
 423         csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO, 0);
 424
 425         pktinfo_id = rndis_get_ppi(rndis_pkt, RNDIS_PKTINFO_ID, 1);
 426
 427         data = (void *)msg + data_offset;
 428
 429         /* Identify RSC frags, drop erroneous packets */
 430         if (pktinfo_id && (pktinfo_id->flag & RNDIS_PKTINFO_SUBALLOC)) {
 431                 if (pktinfo_id->flag & RNDIS_PKTINFO_1ST_FRAG)
 432                         nvchan->rsc.cnt = 0;
 433                 else if (nvchan->rsc.cnt == 0)
 434                         goto drop;
 435
 436                 rsc_more = true;
 437
 438                 if (pktinfo_id->flag & RNDIS_PKTINFO_LAST_FRAG)
 439                         rsc_more = false;
 440
 441                 if (rsc_more && nvchan->rsc.is_last)
 442                         goto drop;
 443         } else {
 444                 nvchan->rsc.cnt = 0;
 445         }
 446
 447         if (unlikely(nvchan->rsc.cnt >= NVSP_RSC_MAX))
 448                 goto drop;
 449
 450         /* Put data into per channel structure.
 451          * Also, remove the rndis trailer padding from rndis packet message
 452          * rndis_pkt->data_len tell us the real data length, we only copy
 453          * the data packet to the stack, without the rndis trailer padding
 454          */
 455         rsc_add_data(nvchan, vlan, csum_info, data, rndis_pkt->data_len);
 456
 457         if (rsc_more)
 458                 return NVSP_STAT_SUCCESS;
 459
 460         ret = netvsc_recv_callback(ndev, nvdev, nvchan);
 461         nvchan->rsc.cnt = 0;
 462
 463         return ret;
 464
 465 drop:
 466         /* Drop incomplete packet */
 467         nvchan->rsc.cnt = 0;
 468         return NVSP_STAT_FAIL;
 469 }
 470
 471 int rndis_filter_receive(struct net_device *ndev,
 472                          struct netvsc_device *net_dev,
 473                          struct netvsc_channel *nvchan,
 474                          void *data, u32 buflen)
 475 {
 476         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 477         struct rndis_message *rndis_msg = data;
 478
 479         if (netif_msg_rx_status(net_device_ctx))
 480                 dump_rndis_message(ndev, rndis_msg);
 481
 482         switch (rndis_msg->ndis_msg_type) {
 483         case RNDIS_MSG_PACKET:
 484                 return rndis_filter_receive_data(ndev, net_dev, nvchan,
 485                                                  rndis_msg, buflen);
 486         case RNDIS_MSG_INIT_C:
 487         case RNDIS_MSG_QUERY_C:
 488         case RNDIS_MSG_SET_C:
 489                 /* completion msgs */
 490                 rndis_filter_receive_response(ndev, net_dev, rndis_msg);
 491                 break;
 492
 493         case RNDIS_MSG_INDICATE:
 494                 /* notification msgs */
 495                 netvsc_linkstatus_callback(ndev, rndis_msg);
 496                 break;
 497         default:
 498                 netdev_err(ndev,
 499                         "unhandled rndis message (type %u len %u)\n",
 500                            rndis_msg->ndis_msg_type,
 501                            rndis_msg->msg_len);
 502                 return NVSP_STAT_FAIL;
 503         }
 504
 505         return NVSP_STAT_SUCCESS;
 506 }
 507
 508 static int rndis_filter_query_device(struct rndis_device *dev,
 509                                      struct netvsc_device *nvdev,
 510                                      u32 oid, void *result, u32 *result_size)
 511 {
 512         struct rndis_request *request;
 513         u32 inresult_size = *result_size;
 514         struct rndis_query_request *query;
 515         struct rndis_query_complete *query_complete;
 516         int ret = 0;
 517
 518         if (!result)
 519                 return -EINVAL;
 520
 521         *result_size = 0;
 522         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 523                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 524         if (!request) {
 525                 ret = -ENOMEM;
 526                 goto cleanup;
 527         }
 528
 529         /* Setup the rndis query */
 530         query = &request->request_msg.msg.query_req;
 531         query->oid = oid;
 532         query->info_buf_offset = sizeof(struct rndis_query_request);
 533         query->info_buflen = 0;
 534         query->dev_vc_handle = 0;
 535
 536         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 537                 struct ndis_offload *hwcaps;
 538                 u32 nvsp_version = nvdev->nvsp_version;
 539                 u8 ndis_rev;
 540                 size_t size;
 541
 542                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 543                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 544                         size = NDIS_OFFLOAD_SIZE;
 545                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 546                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 547                         size = NDIS_OFFLOAD_SIZE_6_1;
 548                 } else {
 549                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 550                         size = NDIS_OFFLOAD_SIZE_6_0;
 551                 }
 552
 553                 request->request_msg.msg_len += size;
 554                 query->info_buflen = size;
 555                 hwcaps = (struct ndis_offload *)
 556                         ((unsigned long)query + query->info_buf_offset);
 557
 558                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 559                 hwcaps->header.revision = ndis_rev;
 560                 hwcaps->header.size = size;
 561
 562         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 563                 struct ndis_recv_scale_cap *cap;
 564
 565                 request->request_msg.msg_len +=
 566                         sizeof(struct ndis_recv_scale_cap);
 567                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 568                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 569                                                      query->info_buf_offset);
 570                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 571                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 572                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 573         }
 574
 575         ret = rndis_filter_send_request(dev, request);
 576         if (ret != 0)
 577                 goto cleanup;
 578
 579         wait_for_completion(&request->wait_event);
 580
 581         /* Copy the response back */
 582         query_complete = &request->response_msg.msg.query_complete;
 583
 584         if (query_complete->info_buflen > inresult_size) {
 585                 ret = -1;
 586                 goto cleanup;
 587         }
 588
 589         memcpy(result,
 590                (void *)((unsigned long)query_complete +
 591                          query_complete->info_buf_offset),
 592                query_complete->info_buflen);
 593
 594         *result_size = query_complete->info_buflen;
 595
 596 cleanup:
 597         if (request)
 598                 put_rndis_request(dev, request);
 599
 600         return ret;
 601 }
 602
 603 /* Get the hardware offload capabilities */
 604 static int
 605 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 606                    struct ndis_offload *caps)
 607 {
 608         u32 caps_len = sizeof(*caps);
 609         int ret;
 610
 611         memset(caps, 0, sizeof(*caps));
 612
 613         ret = rndis_filter_query_device(dev, net_device,
 614                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 615                                         caps, &caps_len);
 616         if (ret)
 617                 return ret;
 618
 619         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 620                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 621                             caps->header.type);
 622                 return -EINVAL;
 623         }
 624
 625         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 626                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 627                             caps->header.revision);
 628                 return -EINVAL;
 629         }
 630
 631         if (caps->header.size > caps_len ||
 632             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 633                 netdev_warn(dev->ndev,
 634                             "invalid NDIS objsize %u, data size %u\n",
 635                             caps->header.size, caps_len);
 636                 return -EINVAL;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 643                                          struct netvsc_device *net_device)
 644 {
 645         u32 size = ETH_ALEN;
 646
 647         return rndis_filter_query_device(dev, net_device,
 648                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 649                                       dev->hw_mac_adr, &size);
 650 }
 651
 652 #define NWADR_STR "NetworkAddress"
 653 #define NWADR_STRLEN 14
 654
 655 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 656                                 const char *mac)
 657 {
 658         struct rndis_device *rdev = nvdev->extension;
 659         struct rndis_request *request;
 660         struct rndis_set_request *set;
 661         struct rndis_config_parameter_info *cpi;
 662         wchar_t *cfg_nwadr, *cfg_mac;
 663         struct rndis_set_complete *set_complete;
 664         char macstr[2*ETH_ALEN+1];
 665         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 666                 2*NWADR_STRLEN + 4*ETH_ALEN;
 667         int ret;
 668
 669         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 670                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 671         if (!request)
 672                 return -ENOMEM;
 673
 674         set = &request->request_msg.msg.set_req;
 675         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 676         set->info_buflen = extlen;
 677         set->info_buf_offset = sizeof(struct rndis_set_request);
 678         set->dev_vc_handle = 0;
 679
 680         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 681                 set->info_buf_offset);
 682         cpi->parameter_name_offset =
 683                 sizeof(struct rndis_config_parameter_info);
 684         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 685         cpi->parameter_name_length = 2*NWADR_STRLEN;
 686         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 687         cpi->parameter_value_offset =
 688                 cpi->parameter_name_offset + cpi->parameter_name_length;
 689         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 690         cpi->parameter_value_length = 4*ETH_ALEN;
 691
 692         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 693         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 694         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 695                               cfg_nwadr, NWADR_STRLEN);
 696         if (ret < 0)
 697                 goto cleanup;
 698         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 699         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 700                               cfg_mac, 2*ETH_ALEN);
 701         if (ret < 0)
 702                 goto cleanup;
 703
 704         ret = rndis_filter_send_request(rdev, request);
 705         if (ret != 0)
 706                 goto cleanup;
 707
 708         wait_for_completion(&request->wait_event);
 709
 710         set_complete = &request->response_msg.msg.set_complete;
 711         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 712                 ret = -EIO;
 713
 714 cleanup:
 715         put_rndis_request(rdev, request);
 716         return ret;
 717 }
 718
 719 int
 720 rndis_filter_set_offload_params(struct net_device *ndev,
 721                                 struct netvsc_device *nvdev,
 722                                 struct ndis_offload_params *req_offloads)
 723 {
 724         struct rndis_device *rdev = nvdev->extension;
 725         struct rndis_request *request;
 726         struct rndis_set_request *set;
 727         struct ndis_offload_params *offload_params;
 728         struct rndis_set_complete *set_complete;
 729         u32 extlen = sizeof(struct ndis_offload_params);
 730         int ret;
 731         u32 vsp_version = nvdev->nvsp_version;
 732
 733         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 734                 extlen = VERSION_4_OFFLOAD_SIZE;
 735                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 736                  * UDP checksum offload.
 737                  */
 738                 req_offloads->udp_ip_v4_csum = 0;
 739                 req_offloads->udp_ip_v6_csum = 0;
 740         }
 741
 742         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 743                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 744         if (!request)
 745                 return -ENOMEM;
 746
 747         set = &request->request_msg.msg.set_req;
 748         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 749         set->info_buflen = extlen;
 750         set->info_buf_offset = sizeof(struct rndis_set_request);
 751         set->dev_vc_handle = 0;
 752
 753         offload_params = (struct ndis_offload_params *)((ulong)set +
 754                                 set->info_buf_offset);
 755         *offload_params = *req_offloads;
 756         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 757         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 758         offload_params->header.size = extlen;
 759
 760         ret = rndis_filter_send_request(rdev, request);
 761         if (ret != 0)
 762                 goto cleanup;
 763
 764         wait_for_completion(&request->wait_event);
 765         set_complete = &request->response_msg.msg.set_complete;
 766         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 767                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 768                            set_complete->status);
 769                 ret = -EINVAL;
 770         }
 771
 772 cleanup:
 773         put_rndis_request(rdev, request);
 774         return ret;
 775 }
 776
 777 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 778                                const u8 *rss_key)
 779 {
 780         struct net_device *ndev = rdev->ndev;
 781         struct rndis_request *request;
 782         struct rndis_set_request *set;
 783         struct rndis_set_complete *set_complete;
 784         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 785                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 786         struct ndis_recv_scale_param *rssp;
 787         u32 *itab;
 788         u8 *keyp;
 789         int i, ret;
 790
 791         request = get_rndis_request(
 792                         rdev, RNDIS_MSG_SET,
 793                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 794         if (!request)
 795                 return -ENOMEM;
 796
 797         set = &request->request_msg.msg.set_req;
 798         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 799         set->info_buflen = extlen;
 800         set->info_buf_offset = sizeof(struct rndis_set_request);
 801         set->dev_vc_handle = 0;
 802
 803         rssp = (struct ndis_recv_scale_param *)(set + 1);
 804         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 805         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 806         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 807         rssp->flag = 0;
 808         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 809                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 810                          NDIS_HASH_TCP_IPV6;
 811         rssp->indirect_tabsize = 4*ITAB_NUM;
 812         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 813         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 814         rssp->hashkey_offset = rssp->indirect_taboffset +
 815                                rssp->indirect_tabsize;
 816
 817         /* Set indirection table entries */
 818         itab = (u32 *)(rssp + 1);
 819         for (i = 0; i < ITAB_NUM; i++)
 820                 itab[i] = rdev->rx_table[i];
 821
 822         /* Set hask key values */
 823         keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
 824         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 825
 826         ret = rndis_filter_send_request(rdev, request);
 827         if (ret != 0)
 828                 goto cleanup;
 829
 830         wait_for_completion(&request->wait_event);
 831         set_complete = &request->response_msg.msg.set_complete;
 832         if (set_complete->status == RNDIS_STATUS_SUCCESS)
 833                 memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 834         else {
 835                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 836                            set_complete->status);
 837                 ret = -EINVAL;
 838         }
 839
 840 cleanup:
 841         put_rndis_request(rdev, request);
 842         return ret;
 843 }
 844
 845 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 846                                                  struct netvsc_device *net_device)
 847 {
 848         u32 size = sizeof(u32);
 849         u32 link_status;
 850
 851         return rndis_filter_query_device(dev, net_device,
 852                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 853                                          &link_status, &size);
 854 }
 855
 856 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 857                                          struct netvsc_device *net_device)
 858 {
 859         u32 size = sizeof(u32);
 860         u32 link_speed;
 861         struct net_device_context *ndc;
 862         int ret;
 863
 864         ret = rndis_filter_query_device(dev, net_device,
 865                                         RNDIS_OID_GEN_LINK_SPEED,
 866                                         &link_speed, &size);
 867
 868         if (!ret) {
 869                 ndc = netdev_priv(dev->ndev);
 870
 871                 /* The link speed reported from host is in 100bps unit, so
 872                  * we convert it to Mbps here.
 873                  */
 874                 ndc->speed = link_speed / 10000;
 875         }
 876
 877         return ret;
 878 }
 879
 880 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 881                                           u32 new_filter)
 882 {
 883         struct rndis_request *request;
 884         struct rndis_set_request *set;
 885         int ret;
 886
 887         if (dev->filter == new_filter)
 888                 return 0;
 889
 890         request = get_rndis_request(dev, RNDIS_MSG_SET,
 891                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 892                         sizeof(u32));
 893         if (!request)
 894                 return -ENOMEM;
 895
 896         /* Setup the rndis set */
 897         set = &request->request_msg.msg.set_req;
 898         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 899         set->info_buflen = sizeof(u32);
 900         set->info_buf_offset = sizeof(struct rndis_set_request);
 901
 902         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 903                &new_filter, sizeof(u32));
 904
 905         ret = rndis_filter_send_request(dev, request);
 906         if (ret == 0) {
 907                 wait_for_completion(&request->wait_event);
 908                 dev->filter = new_filter;
 909         }
 910
 911         put_rndis_request(dev, request);
 912
 913         return ret;
 914 }
 915
 916 static void rndis_set_multicast(struct work_struct *w)
 917 {
 918         struct rndis_device *rdev
 919                 = container_of(w, struct rndis_device, mcast_work);
 920         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
 921         unsigned int flags = rdev->ndev->flags;
 922
 923         if (flags & IFF_PROMISC) {
 924                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 925         } else {
 926                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 927                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 928                 if (flags & IFF_BROADCAST)
 929                         filter |= NDIS_PACKET_TYPE_BROADCAST;
 930         }
 931
 932         rndis_filter_set_packet_filter(rdev, filter);
 933 }
 934
 935 void rndis_filter_update(struct netvsc_device *nvdev)
 936 {
 937         struct rndis_device *rdev = nvdev->extension;
 938
 939         schedule_work(&rdev->mcast_work);
 940 }
 941
 942 static int rndis_filter_init_device(struct rndis_device *dev,
 943                                     struct netvsc_device *nvdev)
 944 {
 945         struct rndis_request *request;
 946         struct rndis_initialize_request *init;
 947         struct rndis_initialize_complete *init_complete;
 948         u32 status;
 949         int ret;
 950
 951         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 952                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 953         if (!request) {
 954                 ret = -ENOMEM;
 955                 goto cleanup;
 956         }
 957
 958         /* Setup the rndis set */
 959         init = &request->request_msg.msg.init_req;
 960         init->major_ver = RNDIS_MAJOR_VERSION;
 961         init->minor_ver = RNDIS_MINOR_VERSION;
 962         init->max_xfer_size = 0x4000;
 963
 964         dev->state = RNDIS_DEV_INITIALIZING;
 965
 966         ret = rndis_filter_send_request(dev, request);
 967         if (ret != 0) {
 968                 dev->state = RNDIS_DEV_UNINITIALIZED;
 969                 goto cleanup;
 970         }
 971
 972         wait_for_completion(&request->wait_event);
 973
 974         init_complete = &request->response_msg.msg.init_complete;
 975         status = init_complete->status;
 976         if (status == RNDIS_STATUS_SUCCESS) {
 977                 dev->state = RNDIS_DEV_INITIALIZED;
 978                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 979                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 980                 ret = 0;
 981         } else {
 982                 dev->state = RNDIS_DEV_UNINITIALIZED;
 983                 ret = -EINVAL;
 984         }
 985
 986 cleanup:
 987         if (request)
 988                 put_rndis_request(dev, request);
 989
 990         return ret;
 991 }
 992
 993 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 994 {
 995         int i;
 996
 997         for (i = 0; i < nvdev->num_chn; i++) {
 998                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 999
1000                 if (nvchan->mrc.first != nvchan->mrc.next)
1001                         return false;
1002
1003                 if (atomic_read(&nvchan->queue_sends) > 0)
1004                         return false;
1005         }
1006
1007         return true;
1008 }
1009
1010 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
1011                                      struct rndis_device *dev)
1012 {
1013         struct rndis_request *request;
1014         struct rndis_halt_request *halt;
1015
1016         /* Attempt to do a rndis device halt */
1017         request = get_rndis_request(dev, RNDIS_MSG_HALT,
1018                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
1019         if (!request)
1020                 goto cleanup;
1021
1022         /* Setup the rndis set */
1023         halt = &request->request_msg.msg.halt_req;
1024         halt->req_id = atomic_inc_return(&dev->new_req_id);
1025
1026         /* Ignore return since this msg is optional. */
1027         rndis_filter_send_request(dev, request);
1028
1029         dev->state = RNDIS_DEV_UNINITIALIZED;
1030
1031 cleanup:
1032         nvdev->destroy = true;
1033
1034         /* Force flag to be ordered before waiting */
1035         wmb();
1036
1037         /* Wait for all send completions */
1038         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
1039
1040         if (request)
1041                 put_rndis_request(dev, request);
1042 }
1043
1044 static int rndis_filter_open_device(struct rndis_device *dev)
1045 {
1046         int ret;
1047
1048         if (dev->state != RNDIS_DEV_INITIALIZED)
1049                 return 0;
1050
1051         ret = rndis_filter_set_packet_filter(dev,
1052                                          NDIS_PACKET_TYPE_BROADCAST |
1053                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1054                                          NDIS_PACKET_TYPE_DIRECTED);
1055         if (ret == 0)
1056                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1057
1058         return ret;
1059 }
1060
1061 static int rndis_filter_close_device(struct rndis_device *dev)
1062 {
1063         int ret;
1064
1065         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1066                 return 0;
1067
1068         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1069         cancel_work_sync(&dev->mcast_work);
1070
1071         ret = rndis_filter_set_packet_filter(dev, 0);
1072         if (ret == -ENODEV)
1073                 ret = 0;
1074
1075         if (ret == 0)
1076                 dev->state = RNDIS_DEV_INITIALIZED;
1077
1078         return ret;
1079 }
1080
1081 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1082 {
1083         struct net_device *ndev =
1084                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1085         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1086         struct netvsc_device *nvscdev;
1087         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1088         struct netvsc_channel *nvchan;
1089         int ret;
1090
1091         /* This is safe because this callback only happens when
1092          * new device is being setup and waiting on the channel_init_wait.
1093          */
1094         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1095         if (!nvscdev || chn_index >= nvscdev->num_chn)
1096                 return;
1097
1098         nvchan = nvscdev->chan_table + chn_index;
1099
1100         /* Because the device uses NAPI, all the interrupt batching and
1101          * control is done via Net softirq, not the channel handling
1102          */
1103         set_channel_read_mode(new_sc, HV_CALL_ISR);
1104
1105         /* Set the channel before opening.*/
1106         nvchan->channel = new_sc;
1107
1108         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1109                          netvsc_ring_bytes, NULL, 0,
1110                          netvsc_channel_cb, nvchan);
1111         if (ret == 0)
1112                 napi_enable(&nvchan->napi);
1113         else
1114                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1115
1116         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1117                 wake_up(&nvscdev->subchan_open);
1118 }
1119
1120 /* Open sub-channels after completing the handling of the device probe.
1121  * This breaks overlap of processing the host message for the
1122  * new primary channel with the initialization of sub-channels.
1123  */
1124 int rndis_set_subchannel(struct net_device *ndev, struct netvsc_device *nvdev)
1125 {
1126         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1127         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1128         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1129         struct rndis_device *rdev = nvdev->extension;
1130         int i, ret;
1131
1132         ASSERT_RTNL();
1133
1134         memset(init_packet, 0, sizeof(struct nvsp_message));
1135         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1136         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1137         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1138                                                 nvdev->num_chn - 1;
1139         trace_nvsp_send(ndev, init_packet);
1140
1141         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1142                                sizeof(struct nvsp_message),
1143                                (unsigned long)init_packet,
1144                                VM_PKT_DATA_INBAND,
1145                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1146         if (ret) {
1147                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1148                 return ret;
1149         }
1150
1151         wait_for_completion(&nvdev->channel_init_wait);
1152         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1153                 netdev_err(ndev, "sub channel request failed\n");
1154                 return -EIO;
1155         }
1156
1157         nvdev->num_chn = 1 +
1158                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1159
1160         /* wait for all sub channels to open */
1161         wait_event(nvdev->subchan_open,
1162                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1163
1164         /* ignore failues from setting rss parameters, still have channels */
1165         rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1166
1167         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1168         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1169
1170         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1171                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1172
1173         return 0;
1174 }
1175
1176 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1177                                    struct netvsc_device *nvdev)
1178 {
1179         struct net_device *net = rndis_device->ndev;
1180         struct net_device_context *net_device_ctx = netdev_priv(net);
1181         struct ndis_offload hwcaps;
1182         struct ndis_offload_params offloads;
1183         unsigned int gso_max_size = GSO_MAX_SIZE;
1184         int ret;
1185
1186         /* Find HW offload capabilities */
1187         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1188         if (ret != 0)
1189                 return ret;
1190
1191         /* A value of zero means "no change"; now turn on what we want. */
1192         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1193
1194         /* Linux does not care about IP checksum, always does in kernel */
1195         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1196
1197         /* Reset previously set hw_features flags */
1198         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1199         net_device_ctx->tx_checksum_mask = 0;
1200
1201         /* Compute tx offload settings based on hw capabilities */
1202         net->hw_features |= NETIF_F_RXCSUM;
1203
1204         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1205                 /* Can checksum TCP */
1206                 net->hw_features |= NETIF_F_IP_CSUM;
1207                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1208
1209                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1210
1211                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1212                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1213                         net->hw_features |= NETIF_F_TSO;
1214
1215                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1216                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1217                 }
1218
1219                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1220                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1221                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1222                 }
1223         }
1224
1225         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1226                 net->hw_features |= NETIF_F_IPV6_CSUM;
1227
1228                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1229                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1230
1231                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1232                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1233                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1234                         net->hw_features |= NETIF_F_TSO6;
1235
1236                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1237                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1238                 }
1239
1240                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1241                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1242                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1243                 }
1244         }
1245
1246         if (hwcaps.rsc.ip4 && hwcaps.rsc.ip6) {
1247                 net->hw_features |= NETIF_F_LRO;
1248
1249                 if (net->features & NETIF_F_LRO) {
1250                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1251                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1252                 } else {
1253                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1254                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1255                 }
1256         }
1257
1258         /* In case some hw_features disappeared we need to remove them from
1259          * net->features list as they're no longer supported.
1260          */
1261         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1262
1263         netif_set_gso_max_size(net, gso_max_size);
1264
1265         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1266
1267         return ret;
1268 }
1269
1270 static void rndis_get_friendly_name(struct net_device *net,
1271                                     struct rndis_device *rndis_device,
1272                                     struct netvsc_device *net_device)
1273 {
1274         ucs2_char_t wname[256];
1275         unsigned long len;
1276         u8 ifalias[256];
1277         u32 size;
1278
1279         size = sizeof(wname);
1280         if (rndis_filter_query_device(rndis_device, net_device,
1281                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1282                                       wname, &size) != 0)
1283                 return; /* ignore if host does not support */
1284
1285         if (size == 0)
1286                 return; /* name not set */
1287
1288         /* Convert Windows Unicode string to UTF-8 */
1289         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1290
1291         /* ignore the default value from host */
1292         if (strcmp(ifalias, "Network Adapter") != 0)
1293                 dev_set_alias(net, ifalias, len);
1294 }
1295
1296 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1297                                       struct netvsc_device_info *device_info)
1298 {
1299         struct net_device *net = hv_get_drvdata(dev);
1300         struct netvsc_device *net_device;
1301         struct rndis_device *rndis_device;
1302         struct ndis_recv_scale_cap rsscap;
1303         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1304         u32 mtu, size;
1305         u32 num_possible_rss_qs;
1306         int i, ret;
1307
1308         rndis_device = get_rndis_device();
1309         if (!rndis_device)
1310                 return ERR_PTR(-ENODEV);
1311
1312         /* Let the inner driver handle this first to create the netvsc channel
1313          * NOTE! Once the channel is created, we may get a receive callback
1314          * (RndisFilterOnReceive()) before this call is completed
1315          */
1316         net_device = netvsc_device_add(dev, device_info);
1317         if (IS_ERR(net_device)) {
1318                 kfree(rndis_device);
1319                 return net_device;
1320         }
1321
1322         /* Initialize the rndis device */
1323         net_device->max_chn = 1;
1324         net_device->num_chn = 1;
1325
1326         net_device->extension = rndis_device;
1327         rndis_device->ndev = net;
1328
1329         /* Send the rndis initialization message */
1330         ret = rndis_filter_init_device(rndis_device, net_device);
1331         if (ret != 0)
1332                 goto err_dev_remv;
1333
1334         /* Get the MTU from the host */
1335         size = sizeof(u32);
1336         ret = rndis_filter_query_device(rndis_device, net_device,
1337                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1338                                         &mtu, &size);
1339         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1340                 net->mtu = mtu;
1341
1342         /* Get the mac address */
1343         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1344         if (ret != 0)
1345                 goto err_dev_remv;
1346
1347         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1348
1349         /* Get friendly name as ifalias*/
1350         if (!net->ifalias)
1351                 rndis_get_friendly_name(net, rndis_device, net_device);
1352
1353         /* Query and set hardware capabilities */
1354         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1355         if (ret != 0)
1356                 goto err_dev_remv;
1357
1358         rndis_filter_query_device_link_status(rndis_device, net_device);
1359
1360         netdev_dbg(net, "Device MAC %pM link state %s\n",
1361                    rndis_device->hw_mac_adr,
1362                    rndis_device->link_state ? "down" : "up");
1363
1364         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1365                 goto out;
1366
1367         rndis_filter_query_link_speed(rndis_device, net_device);
1368
1369         /* vRSS setup */
1370         memset(&rsscap, 0, rsscap_size);
1371         ret = rndis_filter_query_device(rndis_device, net_device,
1372                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1373                                         &rsscap, &rsscap_size);
1374         if (ret || rsscap.num_recv_que < 2)
1375                 goto out;
1376
1377         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1378         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1379                                     rsscap.num_recv_que);
1380
1381         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1382
1383         /* We will use the given number of channels if available. */
1384         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1385
1386         for (i = 0; i < ITAB_NUM; i++)
1387                 rndis_device->rx_table[i] = ethtool_rxfh_indir_default(
1388                                                 i, net_device->num_chn);
1389
1390         atomic_set(&net_device->open_chn, 1);
1391         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1392
1393         for (i = 1; i < net_device->num_chn; i++) {
1394                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1395                 if (ret) {
1396                         while (--i != 0)
1397                                 vfree(net_device->chan_table[i].mrc.slots);
1398                         goto out;
1399                 }
1400         }
1401
1402         for (i = 1; i < net_device->num_chn; i++)
1403                 netif_napi_add(net, &net_device->chan_table[i].napi,
1404                                netvsc_poll, NAPI_POLL_WEIGHT);
1405
1406         return net_device;
1407
1408 out:
1409         /* setting up multiple channels failed */
1410         net_device->max_chn = 1;
1411         net_device->num_chn = 1;
1412         return net_device;
1413
1414 err_dev_remv:
1415         rndis_filter_device_remove(dev, net_device);
1416         return ERR_PTR(ret);
1417 }
1418
1419 void rndis_filter_device_remove(struct hv_device *dev,
1420                                 struct netvsc_device *net_dev)
1421 {
1422         struct rndis_device *rndis_dev = net_dev->extension;
1423
1424         /* Halt and release the rndis device */
1425         rndis_filter_halt_device(net_dev, rndis_dev);
1426
1427         net_dev->extension = NULL;
1428
1429         netvsc_device_remove(dev);
1430 }
1431
1432 int rndis_filter_open(struct netvsc_device *nvdev)
1433 {
1434         if (!nvdev)
1435                 return -EINVAL;
1436
1437         return rndis_filter_open_device(nvdev->extension);
1438 }
1439
1440 int rndis_filter_close(struct netvsc_device *nvdev)
1441 {
1442         if (!nvdev)
1443                 return -EINVAL;
1444
1445         return rndis_filter_close_device(nvdev->extension);
1446 }