drivers/net/hyperv/rndis_filter.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * Authors:
   6  *   Haiyang Zhang <haiyangz@microsoft.com>
   7  *   Hank Janssen  <hjanssen@microsoft.com>
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <linux/wait.h>
  12 #include <linux/highmem.h>
  13 #include <linux/slab.h>
  14 #include <linux/io.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/if_vlan.h>
  18 #include <linux/nls.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/ucs2_string.h>
  22
  23 #include "hyperv_net.h"
  24 #include "netvsc_trace.h"
  25
  26 static void rndis_set_multicast(struct work_struct *w);
  27
  28 #define RNDIS_EXT_LEN PAGE_SIZE
  29 struct rndis_request {
  30         struct list_head list_ent;
  31         struct completion  wait_event;
  32
  33         struct rndis_message response_msg;
  34         /*
  35          * The buffer for extended info after the RNDIS response message. It's
  36          * referenced based on the data offset in the RNDIS message. Its size
  37          * is enough for current needs, and should be sufficient for the near
  38          * future.
  39          */
  40         u8 response_ext[RNDIS_EXT_LEN];
  41
  42         /* Simplify allocation by having a netvsc packet inline */
  43         struct hv_netvsc_packet pkt;
  44
  45         struct rndis_message request_msg;
  46         /*
  47          * The buffer for the extended info after the RNDIS request message.
  48          * It is referenced and sized in a similar way as response_ext.
  49          */
  50         u8 request_ext[RNDIS_EXT_LEN];
  51 };
  52
  53 static const u8 netvsc_hash_key[NETVSC_HASH_KEYLEN] = {
  54         0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
  55         0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
  56         0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
  57         0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
  58         0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
  59 };
  60
  61 static struct rndis_device *get_rndis_device(void)
  62 {
  63         struct rndis_device *device;
  64
  65         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  66         if (!device)
  67                 return NULL;
  68
  69         spin_lock_init(&device->request_lock);
  70
  71         INIT_LIST_HEAD(&device->req_list);
  72         INIT_WORK(&device->mcast_work, rndis_set_multicast);
  73
  74         device->state = RNDIS_DEV_UNINITIALIZED;
  75
  76         return device;
  77 }
  78
  79 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  80                                              u32 msg_type,
  81                                              u32 msg_len)
  82 {
  83         struct rndis_request *request;
  84         struct rndis_message *rndis_msg;
  85         struct rndis_set_request *set;
  86         unsigned long flags;
  87
  88         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  89         if (!request)
  90                 return NULL;
  91
  92         init_completion(&request->wait_event);
  93
  94         rndis_msg = &request->request_msg;
  95         rndis_msg->ndis_msg_type = msg_type;
  96         rndis_msg->msg_len = msg_len;
  97
  98         request->pkt.q_idx = 0;
  99
 100         /*
 101          * Set the request id. This field is always after the rndis header for
 102          * request/response packet types so we just used the SetRequest as a
 103          * template
 104          */
 105         set = &rndis_msg->msg.set_req;
 106         set->req_id = atomic_inc_return(&dev->new_req_id);
 107
 108         /* Add to the request list */
 109         spin_lock_irqsave(&dev->request_lock, flags);
 110         list_add_tail(&request->list_ent, &dev->req_list);
 111         spin_unlock_irqrestore(&dev->request_lock, flags);
 112
 113         return request;
 114 }
 115
 116 static void put_rndis_request(struct rndis_device *dev,
 117                             struct rndis_request *req)
 118 {
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&dev->request_lock, flags);
 122         list_del(&req->list_ent);
 123         spin_unlock_irqrestore(&dev->request_lock, flags);
 124
 125         kfree(req);
 126 }
 127
 128 static void dump_rndis_message(struct net_device *netdev,
 129                                const struct rndis_message *rndis_msg)
 130 {
 131         switch (rndis_msg->ndis_msg_type) {
 132         case RNDIS_MSG_PACKET:
 133                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 134                            "data offset %u data len %u, # oob %u, "
 135                            "oob offset %u, oob len %u, pkt offset %u, "
 136                            "pkt len %u\n",
 137                            rndis_msg->msg_len,
 138                            rndis_msg->msg.pkt.data_offset,
 139                            rndis_msg->msg.pkt.data_len,
 140                            rndis_msg->msg.pkt.num_oob_data_elements,
 141                            rndis_msg->msg.pkt.oob_data_offset,
 142                            rndis_msg->msg.pkt.oob_data_len,
 143                            rndis_msg->msg.pkt.per_pkt_info_offset,
 144                            rndis_msg->msg.pkt.per_pkt_info_len);
 145                 break;
 146
 147         case RNDIS_MSG_INIT_C:
 148                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 149                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 150                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 151                         "pkt aligned %u)\n",
 152                         rndis_msg->msg_len,
 153                         rndis_msg->msg.init_complete.req_id,
 154                         rndis_msg->msg.init_complete.status,
 155                         rndis_msg->msg.init_complete.major_ver,
 156                         rndis_msg->msg.init_complete.minor_ver,
 157                         rndis_msg->msg.init_complete.dev_flags,
 158                         rndis_msg->msg.init_complete.max_xfer_size,
 159                         rndis_msg->msg.init_complete.
 160                            max_pkt_per_msg,
 161                         rndis_msg->msg.init_complete.
 162                            pkt_alignment_factor);
 163                 break;
 164
 165         case RNDIS_MSG_QUERY_C:
 166                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 167                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 168                         "buf offset %u)\n",
 169                         rndis_msg->msg_len,
 170                         rndis_msg->msg.query_complete.req_id,
 171                         rndis_msg->msg.query_complete.status,
 172                         rndis_msg->msg.query_complete.
 173                            info_buflen,
 174                         rndis_msg->msg.query_complete.
 175                            info_buf_offset);
 176                 break;
 177
 178         case RNDIS_MSG_SET_C:
 179                 netdev_dbg(netdev,
 180                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 181                         rndis_msg->msg_len,
 182                         rndis_msg->msg.set_complete.req_id,
 183                         rndis_msg->msg.set_complete.status);
 184                 break;
 185
 186         case RNDIS_MSG_INDICATE:
 187                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 188                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 189                         rndis_msg->msg_len,
 190                         rndis_msg->msg.indicate_status.status,
 191                         rndis_msg->msg.indicate_status.status_buflen,
 192                         rndis_msg->msg.indicate_status.status_buf_offset);
 193                 break;
 194
 195         default:
 196                 netdev_dbg(netdev, "0x%x (len %u)\n",
 197                         rndis_msg->ndis_msg_type,
 198                         rndis_msg->msg_len);
 199                 break;
 200         }
 201 }
 202
 203 static int rndis_filter_send_request(struct rndis_device *dev,
 204                                   struct rndis_request *req)
 205 {
 206         struct hv_netvsc_packet *packet;
 207         struct hv_page_buffer page_buf[2];
 208         struct hv_page_buffer *pb = page_buf;
 209         int ret;
 210
 211         /* Setup the packet to send it */
 212         packet = &req->pkt;
 213
 214         packet->total_data_buflen = req->request_msg.msg_len;
 215         packet->page_buf_cnt = 1;
 216
 217         pb[0].pfn = virt_to_phys(&req->request_msg) >>
 218                                         PAGE_SHIFT;
 219         pb[0].len = req->request_msg.msg_len;
 220         pb[0].offset =
 221                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 222
 223         /* Add one page_buf when request_msg crossing page boundary */
 224         if (pb[0].offset + pb[0].len > PAGE_SIZE) {
 225                 packet->page_buf_cnt++;
 226                 pb[0].len = PAGE_SIZE -
 227                         pb[0].offset;
 228                 pb[1].pfn = virt_to_phys((void *)&req->request_msg
 229                         + pb[0].len) >> PAGE_SHIFT;
 230                 pb[1].offset = 0;
 231                 pb[1].len = req->request_msg.msg_len -
 232                         pb[0].len;
 233         }
 234
 235         trace_rndis_send(dev->ndev, 0, &req->request_msg);
 236
 237         rcu_read_lock_bh();
 238         ret = netvsc_send(dev->ndev, packet, NULL, pb, NULL, false);
 239         rcu_read_unlock_bh();
 240
 241         return ret;
 242 }
 243
 244 static void rndis_set_link_state(struct rndis_device *rdev,
 245                                  struct rndis_request *request)
 246 {
 247         u32 link_status;
 248         struct rndis_query_complete *query_complete;
 249
 250         query_complete = &request->response_msg.msg.query_complete;
 251
 252         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 253             query_complete->info_buflen == sizeof(u32)) {
 254                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 255                        query_complete->info_buf_offset), sizeof(u32));
 256                 rdev->link_state = link_status != 0;
 257         }
 258 }
 259
 260 static void rndis_filter_receive_response(struct net_device *ndev,
 261                                           struct netvsc_device *nvdev,
 262                                           const struct rndis_message *resp)
 263 {
 264         struct rndis_device *dev = nvdev->extension;
 265         struct rndis_request *request = NULL;
 266         bool found = false;
 267         unsigned long flags;
 268
 269         /* This should never happen, it means control message
 270          * response received after device removed.
 271          */
 272         if (dev->state == RNDIS_DEV_UNINITIALIZED) {
 273                 netdev_err(ndev,
 274                            "got rndis message uninitialized\n");
 275                 return;
 276         }
 277
 278         spin_lock_irqsave(&dev->request_lock, flags);
 279         list_for_each_entry(request, &dev->req_list, list_ent) {
 280                 /*
 281                  * All request/response message contains RequestId as the 1st
 282                  * field
 283                  */
 284                 if (request->request_msg.msg.init_req.req_id
 285                     == resp->msg.init_complete.req_id) {
 286                         found = true;
 287                         break;
 288                 }
 289         }
 290         spin_unlock_irqrestore(&dev->request_lock, flags);
 291
 292         if (found) {
 293                 if (resp->msg_len <=
 294                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 295                         memcpy(&request->response_msg, resp,
 296                                resp->msg_len);
 297                         if (request->request_msg.ndis_msg_type ==
 298                             RNDIS_MSG_QUERY && request->request_msg.msg.
 299                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 300                                 rndis_set_link_state(dev, request);
 301                 } else {
 302                         netdev_err(ndev,
 303                                 "rndis response buffer overflow "
 304                                 "detected (size %u max %zu)\n",
 305                                 resp->msg_len,
 306                                 sizeof(struct rndis_message));
 307
 308                         if (resp->ndis_msg_type ==
 309                             RNDIS_MSG_RESET_C) {
 310                                 /* does not have a request id field */
 311                                 request->response_msg.msg.reset_complete.
 312                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 313                         } else {
 314                                 request->response_msg.msg.
 315                                 init_complete.status =
 316                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 317                         }
 318                 }
 319
 320                 complete(&request->wait_event);
 321         } else {
 322                 netdev_err(ndev,
 323                         "no rndis request found for this response "
 324                         "(id 0x%x res type 0x%x)\n",
 325                         resp->msg.init_complete.req_id,
 326                         resp->ndis_msg_type);
 327         }
 328 }
 329
 330 /*
 331  * Get the Per-Packet-Info with the specified type
 332  * return NULL if not found.
 333  */
 334 static inline void *rndis_get_ppi(struct rndis_packet *rpkt,
 335                                   u32 type, u8 internal)
 336 {
 337         struct rndis_per_packet_info *ppi;
 338         int len;
 339
 340         if (rpkt->per_pkt_info_offset == 0)
 341                 return NULL;
 342
 343         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 344                 rpkt->per_pkt_info_offset);
 345         len = rpkt->per_pkt_info_len;
 346
 347         while (len > 0) {
 348                 if (ppi->type == type && ppi->internal == internal)
 349                         return (void *)((ulong)ppi + ppi->ppi_offset);
 350                 len -= ppi->size;
 351                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 352         }
 353
 354         return NULL;
 355 }
 356
 357 static inline
 358 void rsc_add_data(struct netvsc_channel *nvchan,
 359                   const struct ndis_pkt_8021q_info *vlan,
 360                   const struct ndis_tcp_ip_checksum_info *csum_info,
 361                   const u32 *hash_info,
 362                   void *data, u32 len)
 363 {
 364         u32 cnt = nvchan->rsc.cnt;
 365
 366         if (cnt) {
 367                 nvchan->rsc.pktlen += len;
 368         } else {
 369                 nvchan->rsc.vlan = vlan;
 370                 nvchan->rsc.csum_info = csum_info;
 371                 nvchan->rsc.pktlen = len;
 372                 nvchan->rsc.hash_info = hash_info;
 373         }
 374
 375         nvchan->rsc.data[cnt] = data;
 376         nvchan->rsc.len[cnt] = len;
 377         nvchan->rsc.cnt++;
 378 }
 379
 380 static int rndis_filter_receive_data(struct net_device *ndev,
 381                                      struct netvsc_device *nvdev,
 382                                      struct netvsc_channel *nvchan,
 383                                      struct rndis_message *msg,
 384                                      u32 data_buflen)
 385 {
 386         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 387         const struct ndis_tcp_ip_checksum_info *csum_info;
 388         const struct ndis_pkt_8021q_info *vlan;
 389         const struct rndis_pktinfo_id *pktinfo_id;
 390         const u32 *hash_info;
 391         u32 data_offset;
 392         void *data;
 393         bool rsc_more = false;
 394         int ret;
 395
 396         /* Remove the rndis header and pass it back up the stack */
 397         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 398
 399         data_buflen -= data_offset;
 400
 401         /*
 402          * Make sure we got a valid RNDIS message, now total_data_buflen
 403          * should be the data packet size plus the trailer padding size
 404          */
 405         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 406                 netdev_err(ndev, "rndis message buffer "
 407                            "overflow detected (got %u, min %u)"
 408                            "...dropping this message!\n",
 409                            data_buflen, rndis_pkt->data_len);
 410                 return NVSP_STAT_FAIL;
 411         }
 412
 413         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO, 0);
 414
 415         csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO, 0);
 416
 417         hash_info = rndis_get_ppi(rndis_pkt, NBL_HASH_VALUE, 0);
 418
 419         pktinfo_id = rndis_get_ppi(rndis_pkt, RNDIS_PKTINFO_ID, 1);
 420
 421         data = (void *)msg + data_offset;
 422
 423         /* Identify RSC frags, drop erroneous packets */
 424         if (pktinfo_id && (pktinfo_id->flag & RNDIS_PKTINFO_SUBALLOC)) {
 425                 if (pktinfo_id->flag & RNDIS_PKTINFO_1ST_FRAG)
 426                         nvchan->rsc.cnt = 0;
 427                 else if (nvchan->rsc.cnt == 0)
 428                         goto drop;
 429
 430                 rsc_more = true;
 431
 432                 if (pktinfo_id->flag & RNDIS_PKTINFO_LAST_FRAG)
 433                         rsc_more = false;
 434
 435                 if (rsc_more && nvchan->rsc.is_last)
 436                         goto drop;
 437         } else {
 438                 nvchan->rsc.cnt = 0;
 439         }
 440
 441         if (unlikely(nvchan->rsc.cnt >= NVSP_RSC_MAX))
 442                 goto drop;
 443
 444         /* Put data into per channel structure.
 445          * Also, remove the rndis trailer padding from rndis packet message
 446          * rndis_pkt->data_len tell us the real data length, we only copy
 447          * the data packet to the stack, without the rndis trailer padding
 448          */
 449         rsc_add_data(nvchan, vlan, csum_info, hash_info,
 450                      data, rndis_pkt->data_len);
 451
 452         if (rsc_more)
 453                 return NVSP_STAT_SUCCESS;
 454
 455         ret = netvsc_recv_callback(ndev, nvdev, nvchan);
 456         nvchan->rsc.cnt = 0;
 457
 458         return ret;
 459
 460 drop:
 461         /* Drop incomplete packet */
 462         nvchan->rsc.cnt = 0;
 463         return NVSP_STAT_FAIL;
 464 }
 465
 466 int rndis_filter_receive(struct net_device *ndev,
 467                          struct netvsc_device *net_dev,
 468                          struct netvsc_channel *nvchan,
 469                          void *data, u32 buflen)
 470 {
 471         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 472         struct rndis_message *rndis_msg = data;
 473
 474         if (netif_msg_rx_status(net_device_ctx))
 475                 dump_rndis_message(ndev, rndis_msg);
 476
 477         switch (rndis_msg->ndis_msg_type) {
 478         case RNDIS_MSG_PACKET:
 479                 return rndis_filter_receive_data(ndev, net_dev, nvchan,
 480                                                  rndis_msg, buflen);
 481         case RNDIS_MSG_INIT_C:
 482         case RNDIS_MSG_QUERY_C:
 483         case RNDIS_MSG_SET_C:
 484                 /* completion msgs */
 485                 rndis_filter_receive_response(ndev, net_dev, rndis_msg);
 486                 break;
 487
 488         case RNDIS_MSG_INDICATE:
 489                 /* notification msgs */
 490                 netvsc_linkstatus_callback(ndev, rndis_msg);
 491                 break;
 492         default:
 493                 netdev_err(ndev,
 494                         "unhandled rndis message (type %u len %u)\n",
 495                            rndis_msg->ndis_msg_type,
 496                            rndis_msg->msg_len);
 497                 return NVSP_STAT_FAIL;
 498         }
 499
 500         return NVSP_STAT_SUCCESS;
 501 }
 502
 503 static int rndis_filter_query_device(struct rndis_device *dev,
 504                                      struct netvsc_device *nvdev,
 505                                      u32 oid, void *result, u32 *result_size)
 506 {
 507         struct rndis_request *request;
 508         u32 inresult_size = *result_size;
 509         struct rndis_query_request *query;
 510         struct rndis_query_complete *query_complete;
 511         int ret = 0;
 512
 513         if (!result)
 514                 return -EINVAL;
 515
 516         *result_size = 0;
 517         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 518                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 519         if (!request) {
 520                 ret = -ENOMEM;
 521                 goto cleanup;
 522         }
 523
 524         /* Setup the rndis query */
 525         query = &request->request_msg.msg.query_req;
 526         query->oid = oid;
 527         query->info_buf_offset = sizeof(struct rndis_query_request);
 528         query->info_buflen = 0;
 529         query->dev_vc_handle = 0;
 530
 531         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 532                 struct ndis_offload *hwcaps;
 533                 u32 nvsp_version = nvdev->nvsp_version;
 534                 u8 ndis_rev;
 535                 size_t size;
 536
 537                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 538                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 539                         size = NDIS_OFFLOAD_SIZE;
 540                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 541                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 542                         size = NDIS_OFFLOAD_SIZE_6_1;
 543                 } else {
 544                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 545                         size = NDIS_OFFLOAD_SIZE_6_0;
 546                 }
 547
 548                 request->request_msg.msg_len += size;
 549                 query->info_buflen = size;
 550                 hwcaps = (struct ndis_offload *)
 551                         ((unsigned long)query + query->info_buf_offset);
 552
 553                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 554                 hwcaps->header.revision = ndis_rev;
 555                 hwcaps->header.size = size;
 556
 557         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 558                 struct ndis_recv_scale_cap *cap;
 559
 560                 request->request_msg.msg_len +=
 561                         sizeof(struct ndis_recv_scale_cap);
 562                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 563                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 564                                                      query->info_buf_offset);
 565                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 566                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 567                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 568         }
 569
 570         ret = rndis_filter_send_request(dev, request);
 571         if (ret != 0)
 572                 goto cleanup;
 573
 574         wait_for_completion(&request->wait_event);
 575
 576         /* Copy the response back */
 577         query_complete = &request->response_msg.msg.query_complete;
 578
 579         if (query_complete->info_buflen > inresult_size) {
 580                 ret = -1;
 581                 goto cleanup;
 582         }
 583
 584         memcpy(result,
 585                (void *)((unsigned long)query_complete +
 586                          query_complete->info_buf_offset),
 587                query_complete->info_buflen);
 588
 589         *result_size = query_complete->info_buflen;
 590
 591 cleanup:
 592         if (request)
 593                 put_rndis_request(dev, request);
 594
 595         return ret;
 596 }
 597
 598 /* Get the hardware offload capabilities */
 599 static int
 600 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 601                    struct ndis_offload *caps)
 602 {
 603         u32 caps_len = sizeof(*caps);
 604         int ret;
 605
 606         memset(caps, 0, sizeof(*caps));
 607
 608         ret = rndis_filter_query_device(dev, net_device,
 609                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 610                                         caps, &caps_len);
 611         if (ret)
 612                 return ret;
 613
 614         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 615                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 616                             caps->header.type);
 617                 return -EINVAL;
 618         }
 619
 620         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 621                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 622                             caps->header.revision);
 623                 return -EINVAL;
 624         }
 625
 626         if (caps->header.size > caps_len ||
 627             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 628                 netdev_warn(dev->ndev,
 629                             "invalid NDIS objsize %u, data size %u\n",
 630                             caps->header.size, caps_len);
 631                 return -EINVAL;
 632         }
 633
 634         return 0;
 635 }
 636
 637 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 638                                          struct netvsc_device *net_device)
 639 {
 640         u32 size = ETH_ALEN;
 641
 642         return rndis_filter_query_device(dev, net_device,
 643                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 644                                       dev->hw_mac_adr, &size);
 645 }
 646
 647 #define NWADR_STR "NetworkAddress"
 648 #define NWADR_STRLEN 14
 649
 650 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 651                                 const char *mac)
 652 {
 653         struct rndis_device *rdev = nvdev->extension;
 654         struct rndis_request *request;
 655         struct rndis_set_request *set;
 656         struct rndis_config_parameter_info *cpi;
 657         wchar_t *cfg_nwadr, *cfg_mac;
 658         struct rndis_set_complete *set_complete;
 659         char macstr[2*ETH_ALEN+1];
 660         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 661                 2*NWADR_STRLEN + 4*ETH_ALEN;
 662         int ret;
 663
 664         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 665                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 666         if (!request)
 667                 return -ENOMEM;
 668
 669         set = &request->request_msg.msg.set_req;
 670         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 671         set->info_buflen = extlen;
 672         set->info_buf_offset = sizeof(struct rndis_set_request);
 673         set->dev_vc_handle = 0;
 674
 675         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 676                 set->info_buf_offset);
 677         cpi->parameter_name_offset =
 678                 sizeof(struct rndis_config_parameter_info);
 679         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 680         cpi->parameter_name_length = 2*NWADR_STRLEN;
 681         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 682         cpi->parameter_value_offset =
 683                 cpi->parameter_name_offset + cpi->parameter_name_length;
 684         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 685         cpi->parameter_value_length = 4*ETH_ALEN;
 686
 687         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 688         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 689         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 690                               cfg_nwadr, NWADR_STRLEN);
 691         if (ret < 0)
 692                 goto cleanup;
 693         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 694         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 695                               cfg_mac, 2*ETH_ALEN);
 696         if (ret < 0)
 697                 goto cleanup;
 698
 699         ret = rndis_filter_send_request(rdev, request);
 700         if (ret != 0)
 701                 goto cleanup;
 702
 703         wait_for_completion(&request->wait_event);
 704
 705         set_complete = &request->response_msg.msg.set_complete;
 706         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 707                 ret = -EIO;
 708
 709 cleanup:
 710         put_rndis_request(rdev, request);
 711         return ret;
 712 }
 713
 714 int
 715 rndis_filter_set_offload_params(struct net_device *ndev,
 716                                 struct netvsc_device *nvdev,
 717                                 struct ndis_offload_params *req_offloads)
 718 {
 719         struct rndis_device *rdev = nvdev->extension;
 720         struct rndis_request *request;
 721         struct rndis_set_request *set;
 722         struct ndis_offload_params *offload_params;
 723         struct rndis_set_complete *set_complete;
 724         u32 extlen = sizeof(struct ndis_offload_params);
 725         int ret;
 726         u32 vsp_version = nvdev->nvsp_version;
 727
 728         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 729                 extlen = VERSION_4_OFFLOAD_SIZE;
 730                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 731                  * UDP checksum offload.
 732                  */
 733                 req_offloads->udp_ip_v4_csum = 0;
 734                 req_offloads->udp_ip_v6_csum = 0;
 735         }
 736
 737         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 738                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 739         if (!request)
 740                 return -ENOMEM;
 741
 742         set = &request->request_msg.msg.set_req;
 743         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 744         set->info_buflen = extlen;
 745         set->info_buf_offset = sizeof(struct rndis_set_request);
 746         set->dev_vc_handle = 0;
 747
 748         offload_params = (struct ndis_offload_params *)((ulong)set +
 749                                 set->info_buf_offset);
 750         *offload_params = *req_offloads;
 751         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 752         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 753         offload_params->header.size = extlen;
 754
 755         ret = rndis_filter_send_request(rdev, request);
 756         if (ret != 0)
 757                 goto cleanup;
 758
 759         wait_for_completion(&request->wait_event);
 760         set_complete = &request->response_msg.msg.set_complete;
 761         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 762                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 763                            set_complete->status);
 764                 ret = -EINVAL;
 765         }
 766
 767 cleanup:
 768         put_rndis_request(rdev, request);
 769         return ret;
 770 }
 771
 772 static int rndis_set_rss_param_msg(struct rndis_device *rdev,
 773                                    const u8 *rss_key, u16 flag)
 774 {
 775         struct net_device *ndev = rdev->ndev;
 776         struct net_device_context *ndc = netdev_priv(ndev);
 777         struct rndis_request *request;
 778         struct rndis_set_request *set;
 779         struct rndis_set_complete *set_complete;
 780         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 781                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 782         struct ndis_recv_scale_param *rssp;
 783         u32 *itab;
 784         u8 *keyp;
 785         int i, ret;
 786
 787         request = get_rndis_request(
 788                         rdev, RNDIS_MSG_SET,
 789                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 790         if (!request)
 791                 return -ENOMEM;
 792
 793         set = &request->request_msg.msg.set_req;
 794         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 795         set->info_buflen = extlen;
 796         set->info_buf_offset = sizeof(struct rndis_set_request);
 797         set->dev_vc_handle = 0;
 798
 799         rssp = (struct ndis_recv_scale_param *)(set + 1);
 800         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 801         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 802         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 803         rssp->flag = flag;
 804         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 805                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 806                          NDIS_HASH_TCP_IPV6;
 807         rssp->indirect_tabsize = 4*ITAB_NUM;
 808         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 809         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 810         rssp->hashkey_offset = rssp->indirect_taboffset +
 811                                rssp->indirect_tabsize;
 812
 813         /* Set indirection table entries */
 814         itab = (u32 *)(rssp + 1);
 815         for (i = 0; i < ITAB_NUM; i++)
 816                 itab[i] = ndc->rx_table[i];
 817
 818         /* Set hask key values */
 819         keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
 820         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 821
 822         ret = rndis_filter_send_request(rdev, request);
 823         if (ret != 0)
 824                 goto cleanup;
 825
 826         wait_for_completion(&request->wait_event);
 827         set_complete = &request->response_msg.msg.set_complete;
 828         if (set_complete->status == RNDIS_STATUS_SUCCESS) {
 829                 if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
 830                     !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
 831                         memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 832
 833         } else {
 834                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 835                            set_complete->status);
 836                 ret = -EINVAL;
 837         }
 838
 839 cleanup:
 840         put_rndis_request(rdev, request);
 841         return ret;
 842 }
 843
 844 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 845                                const u8 *rss_key)
 846 {
 847         /* Disable RSS before change */
 848         rndis_set_rss_param_msg(rdev, rss_key,
 849                                 NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
 850
 851         return rndis_set_rss_param_msg(rdev, rss_key, 0);
 852 }
 853
 854 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
 855                                                  struct netvsc_device *net_device)
 856 {
 857         u32 size = sizeof(u32);
 858         u32 link_status;
 859
 860         return rndis_filter_query_device(dev, net_device,
 861                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 862                                          &link_status, &size);
 863 }
 864
 865 static int rndis_filter_query_link_speed(struct rndis_device *dev,
 866                                          struct netvsc_device *net_device)
 867 {
 868         u32 size = sizeof(u32);
 869         u32 link_speed;
 870         struct net_device_context *ndc;
 871         int ret;
 872
 873         ret = rndis_filter_query_device(dev, net_device,
 874                                         RNDIS_OID_GEN_LINK_SPEED,
 875                                         &link_speed, &size);
 876
 877         if (!ret) {
 878                 ndc = netdev_priv(dev->ndev);
 879
 880                 /* The link speed reported from host is in 100bps unit, so
 881                  * we convert it to Mbps here.
 882                  */
 883                 ndc->speed = link_speed / 10000;
 884         }
 885
 886         return ret;
 887 }
 888
 889 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 890                                           u32 new_filter)
 891 {
 892         struct rndis_request *request;
 893         struct rndis_set_request *set;
 894         int ret;
 895
 896         if (dev->filter == new_filter)
 897                 return 0;
 898
 899         request = get_rndis_request(dev, RNDIS_MSG_SET,
 900                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 901                         sizeof(u32));
 902         if (!request)
 903                 return -ENOMEM;
 904
 905         /* Setup the rndis set */
 906         set = &request->request_msg.msg.set_req;
 907         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 908         set->info_buflen = sizeof(u32);
 909         set->info_buf_offset = sizeof(struct rndis_set_request);
 910
 911         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 912                &new_filter, sizeof(u32));
 913
 914         ret = rndis_filter_send_request(dev, request);
 915         if (ret == 0) {
 916                 wait_for_completion(&request->wait_event);
 917                 dev->filter = new_filter;
 918         }
 919
 920         put_rndis_request(dev, request);
 921
 922         return ret;
 923 }
 924
 925 static void rndis_set_multicast(struct work_struct *w)
 926 {
 927         struct rndis_device *rdev
 928                 = container_of(w, struct rndis_device, mcast_work);
 929         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
 930         unsigned int flags = rdev->ndev->flags;
 931
 932         if (flags & IFF_PROMISC) {
 933                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 934         } else {
 935                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 936                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 937                 if (flags & IFF_BROADCAST)
 938                         filter |= NDIS_PACKET_TYPE_BROADCAST;
 939         }
 940
 941         rndis_filter_set_packet_filter(rdev, filter);
 942 }
 943
 944 void rndis_filter_update(struct netvsc_device *nvdev)
 945 {
 946         struct rndis_device *rdev = nvdev->extension;
 947
 948         schedule_work(&rdev->mcast_work);
 949 }
 950
 951 static int rndis_filter_init_device(struct rndis_device *dev,
 952                                     struct netvsc_device *nvdev)
 953 {
 954         struct rndis_request *request;
 955         struct rndis_initialize_request *init;
 956         struct rndis_initialize_complete *init_complete;
 957         u32 status;
 958         int ret;
 959
 960         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 961                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 962         if (!request) {
 963                 ret = -ENOMEM;
 964                 goto cleanup;
 965         }
 966
 967         /* Setup the rndis set */
 968         init = &request->request_msg.msg.init_req;
 969         init->major_ver = RNDIS_MAJOR_VERSION;
 970         init->minor_ver = RNDIS_MINOR_VERSION;
 971         init->max_xfer_size = 0x4000;
 972
 973         dev->state = RNDIS_DEV_INITIALIZING;
 974
 975         ret = rndis_filter_send_request(dev, request);
 976         if (ret != 0) {
 977                 dev->state = RNDIS_DEV_UNINITIALIZED;
 978                 goto cleanup;
 979         }
 980
 981         wait_for_completion(&request->wait_event);
 982
 983         init_complete = &request->response_msg.msg.init_complete;
 984         status = init_complete->status;
 985         if (status == RNDIS_STATUS_SUCCESS) {
 986                 dev->state = RNDIS_DEV_INITIALIZED;
 987                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
 988                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
 989                 ret = 0;
 990         } else {
 991                 dev->state = RNDIS_DEV_UNINITIALIZED;
 992                 ret = -EINVAL;
 993         }
 994
 995 cleanup:
 996         if (request)
 997                 put_rndis_request(dev, request);
 998
 999         return ret;
1000 }
1001
1002 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
1003 {
1004         int i;
1005
1006         for (i = 0; i < nvdev->num_chn; i++) {
1007                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1008
1009                 if (nvchan->mrc.first != nvchan->mrc.next)
1010                         return false;
1011
1012                 if (atomic_read(&nvchan->queue_sends) > 0)
1013                         return false;
1014         }
1015
1016         return true;
1017 }
1018
1019 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
1020                                      struct rndis_device *dev)
1021 {
1022         struct rndis_request *request;
1023         struct rndis_halt_request *halt;
1024
1025         /* Attempt to do a rndis device halt */
1026         request = get_rndis_request(dev, RNDIS_MSG_HALT,
1027                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
1028         if (!request)
1029                 goto cleanup;
1030
1031         /* Setup the rndis set */
1032         halt = &request->request_msg.msg.halt_req;
1033         halt->req_id = atomic_inc_return(&dev->new_req_id);
1034
1035         /* Ignore return since this msg is optional. */
1036         rndis_filter_send_request(dev, request);
1037
1038         dev->state = RNDIS_DEV_UNINITIALIZED;
1039
1040 cleanup:
1041         nvdev->destroy = true;
1042
1043         /* Force flag to be ordered before waiting */
1044         wmb();
1045
1046         /* Wait for all send completions */
1047         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
1048
1049         if (request)
1050                 put_rndis_request(dev, request);
1051 }
1052
1053 static int rndis_filter_open_device(struct rndis_device *dev)
1054 {
1055         int ret;
1056
1057         if (dev->state != RNDIS_DEV_INITIALIZED)
1058                 return 0;
1059
1060         ret = rndis_filter_set_packet_filter(dev,
1061                                          NDIS_PACKET_TYPE_BROADCAST |
1062                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1063                                          NDIS_PACKET_TYPE_DIRECTED);
1064         if (ret == 0)
1065                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1066
1067         return ret;
1068 }
1069
1070 static int rndis_filter_close_device(struct rndis_device *dev)
1071 {
1072         int ret;
1073
1074         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1075                 return 0;
1076
1077         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1078         cancel_work_sync(&dev->mcast_work);
1079
1080         ret = rndis_filter_set_packet_filter(dev, 0);
1081         if (ret == -ENODEV)
1082                 ret = 0;
1083
1084         if (ret == 0)
1085                 dev->state = RNDIS_DEV_INITIALIZED;
1086
1087         return ret;
1088 }
1089
1090 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1091 {
1092         struct net_device *ndev =
1093                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1094         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1095         struct netvsc_device *nvscdev;
1096         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1097         struct netvsc_channel *nvchan;
1098         int ret;
1099
1100         /* This is safe because this callback only happens when
1101          * new device is being setup and waiting on the channel_init_wait.
1102          */
1103         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1104         if (!nvscdev || chn_index >= nvscdev->num_chn)
1105                 return;
1106
1107         nvchan = nvscdev->chan_table + chn_index;
1108
1109         /* Because the device uses NAPI, all the interrupt batching and
1110          * control is done via Net softirq, not the channel handling
1111          */
1112         set_channel_read_mode(new_sc, HV_CALL_ISR);
1113
1114         /* Set the channel before opening.*/
1115         nvchan->channel = new_sc;
1116
1117         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1118                          netvsc_ring_bytes, NULL, 0,
1119                          netvsc_channel_cb, nvchan);
1120         if (ret == 0)
1121                 napi_enable(&nvchan->napi);
1122         else
1123                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1124
1125         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1126                 wake_up(&nvscdev->subchan_open);
1127 }
1128
1129 /* Open sub-channels after completing the handling of the device probe.
1130  * This breaks overlap of processing the host message for the
1131  * new primary channel with the initialization of sub-channels.
1132  */
1133 int rndis_set_subchannel(struct net_device *ndev,
1134                          struct netvsc_device *nvdev,
1135                          struct netvsc_device_info *dev_info)
1136 {
1137         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1138         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1139         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1140         struct rndis_device *rdev = nvdev->extension;
1141         int i, ret;
1142
1143         ASSERT_RTNL();
1144
1145         memset(init_packet, 0, sizeof(struct nvsp_message));
1146         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1147         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1148         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1149                                                 nvdev->num_chn - 1;
1150         trace_nvsp_send(ndev, init_packet);
1151
1152         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1153                                sizeof(struct nvsp_message),
1154                                (unsigned long)init_packet,
1155                                VM_PKT_DATA_INBAND,
1156                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1157         if (ret) {
1158                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1159                 return ret;
1160         }
1161
1162         wait_for_completion(&nvdev->channel_init_wait);
1163         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1164                 netdev_err(ndev, "sub channel request failed\n");
1165                 return -EIO;
1166         }
1167
1168         nvdev->num_chn = 1 +
1169                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1170
1171         /* wait for all sub channels to open */
1172         wait_event(nvdev->subchan_open,
1173                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1174
1175         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1176                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1177
1178         /* ignore failures from setting rss parameters, still have channels */
1179         if (dev_info)
1180                 rndis_filter_set_rss_param(rdev, dev_info->rss_key);
1181         else
1182                 rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1183
1184         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1185         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1186
1187         return 0;
1188 }
1189
1190 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1191                                    struct netvsc_device *nvdev)
1192 {
1193         struct net_device *net = rndis_device->ndev;
1194         struct net_device_context *net_device_ctx = netdev_priv(net);
1195         struct ndis_offload hwcaps;
1196         struct ndis_offload_params offloads;
1197         unsigned int gso_max_size = GSO_MAX_SIZE;
1198         int ret;
1199
1200         /* Find HW offload capabilities */
1201         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1202         if (ret != 0)
1203                 return ret;
1204
1205         /* A value of zero means "no change"; now turn on what we want. */
1206         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1207
1208         /* Linux does not care about IP checksum, always does in kernel */
1209         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1210
1211         /* Reset previously set hw_features flags */
1212         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1213         net_device_ctx->tx_checksum_mask = 0;
1214
1215         /* Compute tx offload settings based on hw capabilities */
1216         net->hw_features |= NETIF_F_RXCSUM;
1217         net->hw_features |= NETIF_F_SG;
1218         net->hw_features |= NETIF_F_RXHASH;
1219
1220         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1221                 /* Can checksum TCP */
1222                 net->hw_features |= NETIF_F_IP_CSUM;
1223                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1224
1225                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1226
1227                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1228                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1229                         net->hw_features |= NETIF_F_TSO;
1230
1231                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1232                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1233                 }
1234
1235                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1236                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1237                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1238                 }
1239         }
1240
1241         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1242                 net->hw_features |= NETIF_F_IPV6_CSUM;
1243
1244                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1245                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1246
1247                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1248                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1249                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1250                         net->hw_features |= NETIF_F_TSO6;
1251
1252                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1253                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1254                 }
1255
1256                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1257                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1258                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1259                 }
1260         }
1261
1262         if (hwcaps.rsc.ip4 && hwcaps.rsc.ip6) {
1263                 net->hw_features |= NETIF_F_LRO;
1264
1265                 if (net->features & NETIF_F_LRO) {
1266                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1267                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1268                 } else {
1269                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1270                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1271                 }
1272         }
1273
1274         /* In case some hw_features disappeared we need to remove them from
1275          * net->features list as they're no longer supported.
1276          */
1277         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1278
1279         netif_set_gso_max_size(net, gso_max_size);
1280
1281         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1282
1283         return ret;
1284 }
1285
1286 static void rndis_get_friendly_name(struct net_device *net,
1287                                     struct rndis_device *rndis_device,
1288                                     struct netvsc_device *net_device)
1289 {
1290         ucs2_char_t wname[256];
1291         unsigned long len;
1292         u8 ifalias[256];
1293         u32 size;
1294
1295         size = sizeof(wname);
1296         if (rndis_filter_query_device(rndis_device, net_device,
1297                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1298                                       wname, &size) != 0)
1299                 return; /* ignore if host does not support */
1300
1301         if (size == 0)
1302                 return; /* name not set */
1303
1304         /* Convert Windows Unicode string to UTF-8 */
1305         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1306
1307         /* ignore the default value from host */
1308         if (strcmp(ifalias, "Network Adapter") != 0)
1309                 dev_set_alias(net, ifalias, len);
1310 }
1311
1312 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1313                                       struct netvsc_device_info *device_info)
1314 {
1315         struct net_device *net = hv_get_drvdata(dev);
1316         struct net_device_context *ndc = netdev_priv(net);
1317         struct netvsc_device *net_device;
1318         struct rndis_device *rndis_device;
1319         struct ndis_recv_scale_cap rsscap;
1320         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1321         u32 mtu, size;
1322         u32 num_possible_rss_qs;
1323         int i, ret;
1324
1325         rndis_device = get_rndis_device();
1326         if (!rndis_device)
1327                 return ERR_PTR(-ENODEV);
1328
1329         /* Let the inner driver handle this first to create the netvsc channel
1330          * NOTE! Once the channel is created, we may get a receive callback
1331          * (RndisFilterOnReceive()) before this call is completed
1332          */
1333         net_device = netvsc_device_add(dev, device_info);
1334         if (IS_ERR(net_device)) {
1335                 kfree(rndis_device);
1336                 return net_device;
1337         }
1338
1339         /* Initialize the rndis device */
1340         net_device->max_chn = 1;
1341         net_device->num_chn = 1;
1342
1343         net_device->extension = rndis_device;
1344         rndis_device->ndev = net;
1345
1346         /* Send the rndis initialization message */
1347         ret = rndis_filter_init_device(rndis_device, net_device);
1348         if (ret != 0)
1349                 goto err_dev_remv;
1350
1351         /* Get the MTU from the host */
1352         size = sizeof(u32);
1353         ret = rndis_filter_query_device(rndis_device, net_device,
1354                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1355                                         &mtu, &size);
1356         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1357                 net->mtu = mtu;
1358
1359         /* Get the mac address */
1360         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1361         if (ret != 0)
1362                 goto err_dev_remv;
1363
1364         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1365
1366         /* Get friendly name as ifalias*/
1367         if (!net->ifalias)
1368                 rndis_get_friendly_name(net, rndis_device, net_device);
1369
1370         /* Query and set hardware capabilities */
1371         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1372         if (ret != 0)
1373                 goto err_dev_remv;
1374
1375         rndis_filter_query_device_link_status(rndis_device, net_device);
1376
1377         netdev_dbg(net, "Device MAC %pM link state %s\n",
1378                    rndis_device->hw_mac_adr,
1379                    rndis_device->link_state ? "down" : "up");
1380
1381         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1382                 goto out;
1383
1384         rndis_filter_query_link_speed(rndis_device, net_device);
1385
1386         /* vRSS setup */
1387         memset(&rsscap, 0, rsscap_size);
1388         ret = rndis_filter_query_device(rndis_device, net_device,
1389                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1390                                         &rsscap, &rsscap_size);
1391         if (ret || rsscap.num_recv_que < 2)
1392                 goto out;
1393
1394         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1395         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1396                                     rsscap.num_recv_que);
1397
1398         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1399
1400         /* We will use the given number of channels if available. */
1401         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1402
1403         if (!netif_is_rxfh_configured(net)) {
1404                 for (i = 0; i < ITAB_NUM; i++)
1405                         ndc->rx_table[i] = ethtool_rxfh_indir_default(
1406                                                 i, net_device->num_chn);
1407         }
1408
1409         atomic_set(&net_device->open_chn, 1);
1410         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1411
1412         for (i = 1; i < net_device->num_chn; i++) {
1413                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1414                 if (ret) {
1415                         while (--i != 0)
1416                                 vfree(net_device->chan_table[i].mrc.slots);
1417                         goto out;
1418                 }
1419         }
1420
1421         for (i = 1; i < net_device->num_chn; i++)
1422                 netif_napi_add(net, &net_device->chan_table[i].napi,
1423                                netvsc_poll, NAPI_POLL_WEIGHT);
1424
1425         return net_device;
1426
1427 out:
1428         /* setting up multiple channels failed */
1429         net_device->max_chn = 1;
1430         net_device->num_chn = 1;
1431         return net_device;
1432
1433 err_dev_remv:
1434         rndis_filter_device_remove(dev, net_device);
1435         return ERR_PTR(ret);
1436 }
1437
1438 void rndis_filter_device_remove(struct hv_device *dev,
1439                                 struct netvsc_device *net_dev)
1440 {
1441         struct rndis_device *rndis_dev = net_dev->extension;
1442
1443         /* Halt and release the rndis device */
1444         rndis_filter_halt_device(net_dev, rndis_dev);
1445
1446         netvsc_device_remove(dev);
1447 }
1448
1449 int rndis_filter_open(struct netvsc_device *nvdev)
1450 {
1451         if (!nvdev)
1452                 return -EINVAL;
1453
1454         return rndis_filter_open_device(nvdev->extension);
1455 }
1456
1457 int rndis_filter_close(struct netvsc_device *nvdev)
1458 {
1459         if (!nvdev)
1460                 return -EINVAL;
1461
1462         return rndis_filter_close_device(nvdev->extension);
1463 }