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 static int rndis_set_rss_param_msg(struct rndis_device *rdev,
 778                                    const u8 *rss_key, u16 flag)
 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 = flag;
 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                 if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
 834                     !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
 835                         memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 836
 837         } else {
 838                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 839                            set_complete->status);
 840                 ret = -EINVAL;
 841         }
 842
 843 cleanup:
 844         put_rndis_request(rdev, request);
 845         return ret;
 846 }
 847
 848 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 849                                const u8 *rss_key)
 850 {
 851         /* Disable RSS before change */
 852         rndis_set_rss_param_msg(rdev, rss_key,
 853                                 NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
 854
 855         return rndis_set_rss_param_msg(rdev, rss_key, 0);
 856 }
 857
 858 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 859                                                  struct netvsc_device *net_device)
 860 {
 861         u32 size = sizeof(u32);
 862         u32 link_status;
 863
 864         return rndis_filter_query_device(dev, net_device,
 865                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 866                                          &link_status, &size);
 867 }
 868
 869 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 870                                          struct netvsc_device *net_device)
 871 {
 872         u32 size = sizeof(u32);
 873         u32 link_speed;
 874         struct net_device_context *ndc;
 875         int ret;
 876
 877         ret = rndis_filter_query_device(dev, net_device,
 878                                         RNDIS_OID_GEN_LINK_SPEED,
 879                                         &link_speed, &size);
 880
 881         if (!ret) {
 882                 ndc = netdev_priv(dev->ndev);
 883
 884                 /* The link speed reported from host is in 100bps unit, so
 885                  * we convert it to Mbps here.
 886                  */
 887                 ndc->speed = link_speed / 10000;
 888         }
 889
 890         return ret;
 891 }
 892
 893 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 894                                           u32 new_filter)
 895 {
 896         struct rndis_request *request;
 897         struct rndis_set_request *set;
 898         int ret;
 899
 900         if (dev->filter == new_filter)
 901                 return 0;
 902
 903         request = get_rndis_request(dev, RNDIS_MSG_SET,
 904                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 905                         sizeof(u32));
 906         if (!request)
 907                 return -ENOMEM;
 908
 909         /* Setup the rndis set */
 910         set = &request->request_msg.msg.set_req;
 911         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 912         set->info_buflen = sizeof(u32);
 913         set->info_buf_offset = sizeof(struct rndis_set_request);
 914
 915         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 916                &new_filter, sizeof(u32));
 917
 918         ret = rndis_filter_send_request(dev, request);
 919         if (ret == 0) {
 920                 wait_for_completion(&request->wait_event);
 921                 dev->filter = new_filter;
 922         }
 923
 924         put_rndis_request(dev, request);
 925
 926         return ret;
 927 }
 928
 929 static void rndis_set_multicast(struct work_struct *w)
 930 {
 931         struct rndis_device *rdev
 932                 = container_of(w, struct rndis_device, mcast_work);
 933         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
 934         unsigned int flags = rdev->ndev->flags;
 935
 936         if (flags & IFF_PROMISC) {
 937                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 938         } else {
 939                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 940                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 941                 if (flags & IFF_BROADCAST)
 942                         filter |= NDIS_PACKET_TYPE_BROADCAST;
 943         }
 944
 945         rndis_filter_set_packet_filter(rdev, filter);
 946 }
 947
 948 void rndis_filter_update(struct netvsc_device *nvdev)
 949 {
 950         struct rndis_device *rdev = nvdev->extension;
 951
 952         schedule_work(&rdev->mcast_work);
 953 }
 954
 955 static int rndis_filter_init_device(struct rndis_device *dev,
 956                                     struct netvsc_device *nvdev)
 957 {
 958         struct rndis_request *request;
 959         struct rndis_initialize_request *init;
 960         struct rndis_initialize_complete *init_complete;
 961         u32 status;
 962         int ret;
 963
 964         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 965                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 966         if (!request) {
 967                 ret = -ENOMEM;
 968                 goto cleanup;
 969         }
 970
 971         /* Setup the rndis set */
 972         init = &request->request_msg.msg.init_req;
 973         init->major_ver = RNDIS_MAJOR_VERSION;
 974         init->minor_ver = RNDIS_MINOR_VERSION;
 975         init->max_xfer_size = 0x4000;
 976
 977         dev->state = RNDIS_DEV_INITIALIZING;
 978
 979         ret = rndis_filter_send_request(dev, request);
 980         if (ret != 0) {
 981                 dev->state = RNDIS_DEV_UNINITIALIZED;
 982                 goto cleanup;
 983         }
 984
 985         wait_for_completion(&request->wait_event);
 986
 987         init_complete = &request->response_msg.msg.init_complete;
 988         status = init_complete->status;
 989         if (status == RNDIS_STATUS_SUCCESS) {
 990                 dev->state = RNDIS_DEV_INITIALIZED;
 991                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 992                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 993                 ret = 0;
 994         } else {
 995                 dev->state = RNDIS_DEV_UNINITIALIZED;
 996                 ret = -EINVAL;
 997         }
 998
 999 cleanup:
1000         if (request)
1001                 put_rndis_request(dev, request);
1002
1003         return ret;
1004 }
1005
1006 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
1007 {
1008         int i;
1009
1010         for (i = 0; i < nvdev->num_chn; i++) {
1011                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1012
1013                 if (nvchan->mrc.first != nvchan->mrc.next)
1014                         return false;
1015
1016                 if (atomic_read(&nvchan->queue_sends) > 0)
1017                         return false;
1018         }
1019
1020         return true;
1021 }
1022
1023 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
1024                                      struct rndis_device *dev)
1025 {
1026         struct rndis_request *request;
1027         struct rndis_halt_request *halt;
1028
1029         /* Attempt to do a rndis device halt */
1030         request = get_rndis_request(dev, RNDIS_MSG_HALT,
1031                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
1032         if (!request)
1033                 goto cleanup;
1034
1035         /* Setup the rndis set */
1036         halt = &request->request_msg.msg.halt_req;
1037         halt->req_id = atomic_inc_return(&dev->new_req_id);
1038
1039         /* Ignore return since this msg is optional. */
1040         rndis_filter_send_request(dev, request);
1041
1042         dev->state = RNDIS_DEV_UNINITIALIZED;
1043
1044 cleanup:
1045         nvdev->destroy = true;
1046
1047         /* Force flag to be ordered before waiting */
1048         wmb();
1049
1050         /* Wait for all send completions */
1051         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
1052
1053         if (request)
1054                 put_rndis_request(dev, request);
1055 }
1056
1057 static int rndis_filter_open_device(struct rndis_device *dev)
1058 {
1059         int ret;
1060
1061         if (dev->state != RNDIS_DEV_INITIALIZED)
1062                 return 0;
1063
1064         ret = rndis_filter_set_packet_filter(dev,
1065                                          NDIS_PACKET_TYPE_BROADCAST |
1066                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1067                                          NDIS_PACKET_TYPE_DIRECTED);
1068         if (ret == 0)
1069                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1070
1071         return ret;
1072 }
1073
1074 static int rndis_filter_close_device(struct rndis_device *dev)
1075 {
1076         int ret;
1077
1078         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1079                 return 0;
1080
1081         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1082         cancel_work_sync(&dev->mcast_work);
1083
1084         ret = rndis_filter_set_packet_filter(dev, 0);
1085         if (ret == -ENODEV)
1086                 ret = 0;
1087
1088         if (ret == 0)
1089                 dev->state = RNDIS_DEV_INITIALIZED;
1090
1091         return ret;
1092 }
1093
1094 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1095 {
1096         struct net_device *ndev =
1097                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1098         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1099         struct netvsc_device *nvscdev;
1100         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1101         struct netvsc_channel *nvchan;
1102         int ret;
1103
1104         /* This is safe because this callback only happens when
1105          * new device is being setup and waiting on the channel_init_wait.
1106          */
1107         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1108         if (!nvscdev || chn_index >= nvscdev->num_chn)
1109                 return;
1110
1111         nvchan = nvscdev->chan_table + chn_index;
1112
1113         /* Because the device uses NAPI, all the interrupt batching and
1114          * control is done via Net softirq, not the channel handling
1115          */
1116         set_channel_read_mode(new_sc, HV_CALL_ISR);
1117
1118         /* Set the channel before opening.*/
1119         nvchan->channel = new_sc;
1120
1121         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1122                          netvsc_ring_bytes, NULL, 0,
1123                          netvsc_channel_cb, nvchan);
1124         if (ret == 0)
1125                 napi_enable(&nvchan->napi);
1126         else
1127                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1128
1129         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1130                 wake_up(&nvscdev->subchan_open);
1131 }
1132
1133 /* Open sub-channels after completing the handling of the device probe.
1134  * This breaks overlap of processing the host message for the
1135  * new primary channel with the initialization of sub-channels.
1136  */
1137 int rndis_set_subchannel(struct net_device *ndev,
1138                          struct netvsc_device *nvdev,
1139                          struct netvsc_device_info *dev_info)
1140 {
1141         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1142         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1143         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1144         struct rndis_device *rdev = nvdev->extension;
1145         int i, ret;
1146
1147         ASSERT_RTNL();
1148
1149         memset(init_packet, 0, sizeof(struct nvsp_message));
1150         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1151         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1152         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1153                                                 nvdev->num_chn - 1;
1154         trace_nvsp_send(ndev, init_packet);
1155
1156         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1157                                sizeof(struct nvsp_message),
1158                                (unsigned long)init_packet,
1159                                VM_PKT_DATA_INBAND,
1160                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1161         if (ret) {
1162                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1163                 return ret;
1164         }
1165
1166         wait_for_completion(&nvdev->channel_init_wait);
1167         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1168                 netdev_err(ndev, "sub channel request failed\n");
1169                 return -EIO;
1170         }
1171
1172         nvdev->num_chn = 1 +
1173                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1174
1175         /* wait for all sub channels to open */
1176         wait_event(nvdev->subchan_open,
1177                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1178
1179         /* ignore failures from setting rss parameters, still have channels */
1180         if (dev_info)
1181                 rndis_filter_set_rss_param(rdev, dev_info->rss_key);
1182         else
1183                 rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1184
1185         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1186         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1187
1188         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1189                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1190
1191         return 0;
1192 }
1193
1194 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1195                                    struct netvsc_device *nvdev)
1196 {
1197         struct net_device *net = rndis_device->ndev;
1198         struct net_device_context *net_device_ctx = netdev_priv(net);
1199         struct ndis_offload hwcaps;
1200         struct ndis_offload_params offloads;
1201         unsigned int gso_max_size = GSO_MAX_SIZE;
1202         int ret;
1203
1204         /* Find HW offload capabilities */
1205         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1206         if (ret != 0)
1207                 return ret;
1208
1209         /* A value of zero means "no change"; now turn on what we want. */
1210         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1211
1212         /* Linux does not care about IP checksum, always does in kernel */
1213         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1214
1215         /* Reset previously set hw_features flags */
1216         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1217         net_device_ctx->tx_checksum_mask = 0;
1218
1219         /* Compute tx offload settings based on hw capabilities */
1220         net->hw_features |= NETIF_F_RXCSUM;
1221
1222         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1223                 /* Can checksum TCP */
1224                 net->hw_features |= NETIF_F_IP_CSUM;
1225                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1226
1227                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1228
1229                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1230                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1231                         net->hw_features |= NETIF_F_TSO;
1232
1233                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1234                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1235                 }
1236
1237                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1238                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1239                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1240                 }
1241         }
1242
1243         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1244                 net->hw_features |= NETIF_F_IPV6_CSUM;
1245
1246                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1247                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1248
1249                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1250                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1251                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1252                         net->hw_features |= NETIF_F_TSO6;
1253
1254                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1255                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1256                 }
1257
1258                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1259                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1260                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1261                 }
1262         }
1263
1264         if (hwcaps.rsc.ip4 && hwcaps.rsc.ip6) {
1265                 net->hw_features |= NETIF_F_LRO;
1266
1267                 if (net->features & NETIF_F_LRO) {
1268                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1269                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1270                 } else {
1271                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1272                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1273                 }
1274         }
1275
1276         /* In case some hw_features disappeared we need to remove them from
1277          * net->features list as they're no longer supported.
1278          */
1279         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1280
1281         netif_set_gso_max_size(net, gso_max_size);
1282
1283         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1284
1285         return ret;
1286 }
1287
1288 static void rndis_get_friendly_name(struct net_device *net,
1289                                     struct rndis_device *rndis_device,
1290                                     struct netvsc_device *net_device)
1291 {
1292         ucs2_char_t wname[256];
1293         unsigned long len;
1294         u8 ifalias[256];
1295         u32 size;
1296
1297         size = sizeof(wname);
1298         if (rndis_filter_query_device(rndis_device, net_device,
1299                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1300                                       wname, &size) != 0)
1301                 return; /* ignore if host does not support */
1302
1303         if (size == 0)
1304                 return; /* name not set */
1305
1306         /* Convert Windows Unicode string to UTF-8 */
1307         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1308
1309         /* ignore the default value from host */
1310         if (strcmp(ifalias, "Network Adapter") != 0)
1311                 dev_set_alias(net, ifalias, len);
1312 }
1313
1314 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1315                                       struct netvsc_device_info *device_info)
1316 {
1317         struct net_device *net = hv_get_drvdata(dev);
1318         struct netvsc_device *net_device;
1319         struct rndis_device *rndis_device;
1320         struct ndis_recv_scale_cap rsscap;
1321         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1322         u32 mtu, size;
1323         u32 num_possible_rss_qs;
1324         int i, ret;
1325
1326         rndis_device = get_rndis_device();
1327         if (!rndis_device)
1328                 return ERR_PTR(-ENODEV);
1329
1330         /* Let the inner driver handle this first to create the netvsc channel
1331          * NOTE! Once the channel is created, we may get a receive callback
1332          * (RndisFilterOnReceive()) before this call is completed
1333          */
1334         net_device = netvsc_device_add(dev, device_info);
1335         if (IS_ERR(net_device)) {
1336                 kfree(rndis_device);
1337                 return net_device;
1338         }
1339
1340         /* Initialize the rndis device */
1341         net_device->max_chn = 1;
1342         net_device->num_chn = 1;
1343
1344         net_device->extension = rndis_device;
1345         rndis_device->ndev = net;
1346
1347         /* Send the rndis initialization message */
1348         ret = rndis_filter_init_device(rndis_device, net_device);
1349         if (ret != 0)
1350                 goto err_dev_remv;
1351
1352         /* Get the MTU from the host */
1353         size = sizeof(u32);
1354         ret = rndis_filter_query_device(rndis_device, net_device,
1355                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1356                                         &mtu, &size);
1357         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1358                 net->mtu = mtu;
1359
1360         /* Get the mac address */
1361         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1362         if (ret != 0)
1363                 goto err_dev_remv;
1364
1365         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1366
1367         /* Get friendly name as ifalias*/
1368         if (!net->ifalias)
1369                 rndis_get_friendly_name(net, rndis_device, net_device);
1370
1371         /* Query and set hardware capabilities */
1372         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1373         if (ret != 0)
1374                 goto err_dev_remv;
1375
1376         rndis_filter_query_device_link_status(rndis_device, net_device);
1377
1378         netdev_dbg(net, "Device MAC %pM link state %s\n",
1379                    rndis_device->hw_mac_adr,
1380                    rndis_device->link_state ? "down" : "up");
1381
1382         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1383                 goto out;
1384
1385         rndis_filter_query_link_speed(rndis_device, net_device);
1386
1387         /* vRSS setup */
1388         memset(&rsscap, 0, rsscap_size);
1389         ret = rndis_filter_query_device(rndis_device, net_device,
1390                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1391                                         &rsscap, &rsscap_size);
1392         if (ret || rsscap.num_recv_que < 2)
1393                 goto out;
1394
1395         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1396         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1397                                     rsscap.num_recv_que);
1398
1399         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1400
1401         /* We will use the given number of channels if available. */
1402         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1403
1404         for (i = 0; i < ITAB_NUM; i++)
1405                 rndis_device->rx_table[i] = ethtool_rxfh_indir_default(
1406                                                 i, net_device->num_chn);
1407
1408         atomic_set(&net_device->open_chn, 1);
1409         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1410
1411         for (i = 1; i < net_device->num_chn; i++) {
1412                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1413                 if (ret) {
1414                         while (--i != 0)
1415                                 vfree(net_device->chan_table[i].mrc.slots);
1416                         goto out;
1417                 }
1418         }
1419
1420         for (i = 1; i < net_device->num_chn; i++)
1421                 netif_napi_add(net, &net_device->chan_table[i].napi,
1422                                netvsc_poll, NAPI_POLL_WEIGHT);
1423
1424         return net_device;
1425
1426 out:
1427         /* setting up multiple channels failed */
1428         net_device->max_chn = 1;
1429         net_device->num_chn = 1;
1430         return net_device;
1431
1432 err_dev_remv:
1433         rndis_filter_device_remove(dev, net_device);
1434         return ERR_PTR(ret);
1435 }
1436
1437 void rndis_filter_device_remove(struct hv_device *dev,
1438                                 struct netvsc_device *net_dev)
1439 {
1440         struct rndis_device *rndis_dev = net_dev->extension;
1441
1442         /* Halt and release the rndis device */
1443         rndis_filter_halt_device(net_dev, rndis_dev);
1444
1445         net_dev->extension = NULL;
1446
1447         netvsc_device_remove(dev);
1448 }
1449
1450 int rndis_filter_open(struct netvsc_device *nvdev)
1451 {
1452         if (!nvdev)
1453                 return -EINVAL;
1454
1455         return rndis_filter_open_device(nvdev->extension);
1456 }
1457
1458 int rndis_filter_close(struct netvsc_device *nvdev)
1459 {
1460         if (!nvdev)
1461                 return -EINVAL;
1462
1463         return rndis_filter_close_device(nvdev->extension);
1464 }