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/ethtool.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/wait.h>
  13 #include <linux/highmem.h>
  14 #include <linux/slab.h>
  15 #include <linux/io.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/if_vlan.h>
  19 #include <linux/nls.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/ucs2_string.h>
  23
  24 #include "hyperv_net.h"
  25 #include "netvsc_trace.h"
  26
  27 static void rndis_set_multicast(struct work_struct *w);
  28
  29 #define RNDIS_EXT_LEN HV_HYP_PAGE_SIZE
  30 struct rndis_request {
  31         struct list_head list_ent;
  32         struct completion  wait_event;
  33
  34         struct rndis_message response_msg;
  35         /*
  36          * The buffer for extended info after the RNDIS response message. It's
  37          * referenced based on the data offset in the RNDIS message. Its size
  38          * is enough for current needs, and should be sufficient for the near
  39          * future.
  40          */
  41         u8 response_ext[RNDIS_EXT_LEN];
  42
  43         /* Simplify allocation by having a netvsc packet inline */
  44         struct hv_netvsc_packet pkt;
  45
  46         struct rndis_message request_msg;
  47         /*
  48          * The buffer for the extended info after the RNDIS request message.
  49          * It is referenced and sized in a similar way as response_ext.
  50          */
  51         u8 request_ext[RNDIS_EXT_LEN];
  52 };
  53
  54 static const u8 netvsc_hash_key[NETVSC_HASH_KEYLEN] = {
  55         0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
  56         0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
  57         0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
  58         0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
  59         0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
  60 };
  61
  62 static struct rndis_device *get_rndis_device(void)
  63 {
  64         struct rndis_device *device;
  65
  66         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  67         if (!device)
  68                 return NULL;
  69
  70         spin_lock_init(&device->request_lock);
  71
  72         INIT_LIST_HEAD(&device->req_list);
  73         INIT_WORK(&device->mcast_work, rndis_set_multicast);
  74
  75         device->state = RNDIS_DEV_UNINITIALIZED;
  76
  77         return device;
  78 }
  79
  80 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  81                                              u32 msg_type,
  82                                              u32 msg_len)
  83 {
  84         struct rndis_request *request;
  85         struct rndis_message *rndis_msg;
  86         struct rndis_set_request *set;
  87         unsigned long flags;
  88
  89         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  90         if (!request)
  91                 return NULL;
  92
  93         init_completion(&request->wait_event);
  94
  95         rndis_msg = &request->request_msg;
  96         rndis_msg->ndis_msg_type = msg_type;
  97         rndis_msg->msg_len = msg_len;
  98
  99         request->pkt.q_idx = 0;
 100
 101         /*
 102          * Set the request id. This field is always after the rndis header for
 103          * request/response packet types so we just used the SetRequest as a
 104          * template
 105          */
 106         set = &rndis_msg->msg.set_req;
 107         set->req_id = atomic_inc_return(&dev->new_req_id);
 108
 109         /* Add to the request list */
 110         spin_lock_irqsave(&dev->request_lock, flags);
 111         list_add_tail(&request->list_ent, &dev->req_list);
 112         spin_unlock_irqrestore(&dev->request_lock, flags);
 113
 114         return request;
 115 }
 116
 117 static void put_rndis_request(struct rndis_device *dev,
 118                             struct rndis_request *req)
 119 {
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&dev->request_lock, flags);
 123         list_del(&req->list_ent);
 124         spin_unlock_irqrestore(&dev->request_lock, flags);
 125
 126         kfree(req);
 127 }
 128
 129 static void dump_rndis_message(struct net_device *netdev,
 130                                const struct rndis_message *rndis_msg,
 131                                const void *data)
 132 {
 133         switch (rndis_msg->ndis_msg_type) {
 134         case RNDIS_MSG_PACKET:
 135                 if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >= sizeof(struct rndis_packet)) {
 136                         const struct rndis_packet *pkt = data + RNDIS_HEADER_SIZE;
 137                         netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 138                                    "data offset %u data len %u, # oob %u, "
 139                                    "oob offset %u, oob len %u, pkt offset %u, "
 140                                    "pkt len %u\n",
 141                                    rndis_msg->msg_len,
 142                                    pkt->data_offset,
 143                                    pkt->data_len,
 144                                    pkt->num_oob_data_elements,
 145                                    pkt->oob_data_offset,
 146                                    pkt->oob_data_len,
 147                                    pkt->per_pkt_info_offset,
 148                                    pkt->per_pkt_info_len);
 149                 }
 150                 break;
 151
 152         case RNDIS_MSG_INIT_C:
 153                 if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >=
 154                                 sizeof(struct rndis_initialize_complete)) {
 155                         const struct rndis_initialize_complete *init_complete =
 156                                 data + RNDIS_HEADER_SIZE;
 157                         netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 158                                 "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 159                                 "device flags %d, max xfer size 0x%x, max pkts %u, "
 160                                 "pkt aligned %u)\n",
 161                                 rndis_msg->msg_len,
 162                                 init_complete->req_id,
 163                                 init_complete->status,
 164                                 init_complete->major_ver,
 165                                 init_complete->minor_ver,
 166                                 init_complete->dev_flags,
 167                                 init_complete->max_xfer_size,
 168                                 init_complete->max_pkt_per_msg,
 169                                 init_complete->pkt_alignment_factor);
 170                 }
 171                 break;
 172
 173         case RNDIS_MSG_QUERY_C:
 174                 if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >=
 175                                 sizeof(struct rndis_query_complete)) {
 176                         const struct rndis_query_complete *query_complete =
 177                                 data + RNDIS_HEADER_SIZE;
 178                         netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 179                                 "(len %u, id 0x%x, status 0x%x, buf len %u, "
 180                                 "buf offset %u)\n",
 181                                 rndis_msg->msg_len,
 182                                 query_complete->req_id,
 183                                 query_complete->status,
 184                                 query_complete->info_buflen,
 185                                 query_complete->info_buf_offset);
 186                 }
 187                 break;
 188
 189         case RNDIS_MSG_SET_C:
 190                 if (rndis_msg->msg_len - RNDIS_HEADER_SIZE + sizeof(struct rndis_set_complete)) {
 191                         const struct rndis_set_complete *set_complete =
 192                                 data + RNDIS_HEADER_SIZE;
 193                         netdev_dbg(netdev,
 194                                 "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 195                                 rndis_msg->msg_len,
 196                                 set_complete->req_id,
 197                                 set_complete->status);
 198                 }
 199                 break;
 200
 201         case RNDIS_MSG_INDICATE:
 202                 if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >=
 203                                 sizeof(struct rndis_indicate_status)) {
 204                         const struct rndis_indicate_status *indicate_status =
 205                                 data + RNDIS_HEADER_SIZE;
 206                         netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 207                                 "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 208                                 rndis_msg->msg_len,
 209                                 indicate_status->status,
 210                                 indicate_status->status_buflen,
 211                                 indicate_status->status_buf_offset);
 212                 }
 213                 break;
 214
 215         default:
 216                 netdev_dbg(netdev, "0x%x (len %u)\n",
 217                         rndis_msg->ndis_msg_type,
 218                         rndis_msg->msg_len);
 219                 break;
 220         }
 221 }
 222
 223 static int rndis_filter_send_request(struct rndis_device *dev,
 224                                   struct rndis_request *req)
 225 {
 226         struct hv_netvsc_packet *packet;
 227         struct hv_page_buffer page_buf[2];
 228         struct hv_page_buffer *pb = page_buf;
 229         int ret;
 230
 231         /* Setup the packet to send it */
 232         packet = &req->pkt;
 233
 234         packet->total_data_buflen = req->request_msg.msg_len;
 235         packet->page_buf_cnt = 1;
 236
 237         pb[0].pfn = virt_to_phys(&req->request_msg) >>
 238                                         HV_HYP_PAGE_SHIFT;
 239         pb[0].len = req->request_msg.msg_len;
 240         pb[0].offset = offset_in_hvpage(&req->request_msg);
 241
 242         /* Add one page_buf when request_msg crossing page boundary */
 243         if (pb[0].offset + pb[0].len > HV_HYP_PAGE_SIZE) {
 244                 packet->page_buf_cnt++;
 245                 pb[0].len = HV_HYP_PAGE_SIZE -
 246                         pb[0].offset;
 247                 pb[1].pfn = virt_to_phys((void *)&req->request_msg
 248                         + pb[0].len) >> HV_HYP_PAGE_SHIFT;
 249                 pb[1].offset = 0;
 250                 pb[1].len = req->request_msg.msg_len -
 251                         pb[0].len;
 252         }
 253
 254         trace_rndis_send(dev->ndev, 0, &req->request_msg);
 255
 256         rcu_read_lock_bh();
 257         ret = netvsc_send(dev->ndev, packet, NULL, pb, NULL, false);
 258         rcu_read_unlock_bh();
 259
 260         return ret;
 261 }
 262
 263 static void rndis_set_link_state(struct rndis_device *rdev,
 264                                  struct rndis_request *request)
 265 {
 266         u32 link_status;
 267         struct rndis_query_complete *query_complete;
 268         u32 msg_len = request->response_msg.msg_len;
 269
 270         /* Ensure the packet is big enough to access its fields */
 271         if (msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_query_complete))
 272                 return;
 273
 274         query_complete = &request->response_msg.msg.query_complete;
 275
 276         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 277             query_complete->info_buflen >= sizeof(u32) &&
 278             query_complete->info_buf_offset >= sizeof(*query_complete) &&
 279             msg_len - RNDIS_HEADER_SIZE >= query_complete->info_buf_offset &&
 280             msg_len - RNDIS_HEADER_SIZE - query_complete->info_buf_offset
 281                         >= query_complete->info_buflen) {
 282                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 283                        query_complete->info_buf_offset), sizeof(u32));
 284                 rdev->link_state = link_status != 0;
 285         }
 286 }
 287
 288 static void rndis_filter_receive_response(struct net_device *ndev,
 289                                           struct netvsc_device *nvdev,
 290                                           struct rndis_message *resp,
 291                                           void *data)
 292 {
 293         u32 *req_id = &resp->msg.init_complete.req_id;
 294         struct rndis_device *dev = nvdev->extension;
 295         struct rndis_request *request = NULL;
 296         bool found = false;
 297         unsigned long flags;
 298
 299         /* This should never happen, it means control message
 300          * response received after device removed.
 301          */
 302         if (dev->state == RNDIS_DEV_UNINITIALIZED) {
 303                 netdev_err(ndev,
 304                            "got rndis message uninitialized\n");
 305                 return;
 306         }
 307
 308         /* Ensure the packet is big enough to read req_id. Req_id is the 1st
 309          * field in any request/response message, so the payload should have at
 310          * least sizeof(u32) bytes
 311          */
 312         if (resp->msg_len - RNDIS_HEADER_SIZE < sizeof(u32)) {
 313                 netdev_err(ndev, "rndis msg_len too small: %u\n",
 314                            resp->msg_len);
 315                 return;
 316         }
 317
 318         /* Copy the request ID into nvchan->recv_buf */
 319         *req_id = *(u32 *)(data + RNDIS_HEADER_SIZE);
 320
 321         spin_lock_irqsave(&dev->request_lock, flags);
 322         list_for_each_entry(request, &dev->req_list, list_ent) {
 323                 /*
 324                  * All request/response message contains RequestId as the 1st
 325                  * field
 326                  */
 327                 if (request->request_msg.msg.init_req.req_id == *req_id) {
 328                         found = true;
 329                         break;
 330                 }
 331         }
 332         spin_unlock_irqrestore(&dev->request_lock, flags);
 333
 334         if (found) {
 335                 if (resp->msg_len <=
 336                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 337                         memcpy(&request->response_msg, resp, RNDIS_HEADER_SIZE + sizeof(*req_id));
 338                         memcpy((void *)&request->response_msg + RNDIS_HEADER_SIZE + sizeof(*req_id),
 339                                data + RNDIS_HEADER_SIZE + sizeof(*req_id),
 340                                resp->msg_len - RNDIS_HEADER_SIZE - sizeof(*req_id));
 341                         if (request->request_msg.ndis_msg_type ==
 342                             RNDIS_MSG_QUERY && request->request_msg.msg.
 343                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 344                                 rndis_set_link_state(dev, request);
 345                 } else {
 346                         netdev_err(ndev,
 347                                 "rndis response buffer overflow "
 348                                 "detected (size %u max %zu)\n",
 349                                 resp->msg_len,
 350                                 sizeof(struct rndis_message));
 351
 352                         if (resp->ndis_msg_type ==
 353                             RNDIS_MSG_RESET_C) {
 354                                 /* does not have a request id field */
 355                                 request->response_msg.msg.reset_complete.
 356                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 357                         } else {
 358                                 request->response_msg.msg.
 359                                 init_complete.status =
 360                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 361                         }
 362                 }
 363
 364                 complete(&request->wait_event);
 365         } else {
 366                 netdev_err(ndev,
 367                         "no rndis request found for this response "
 368                         "(id 0x%x res type 0x%x)\n",
 369                         *req_id,
 370                         resp->ndis_msg_type);
 371         }
 372 }
 373
 374 /*
 375  * Get the Per-Packet-Info with the specified type
 376  * return NULL if not found.
 377  */
 378 static inline void *rndis_get_ppi(struct net_device *ndev,
 379                                   struct rndis_packet *rpkt,
 380                                   u32 rpkt_len, u32 type, u8 internal,
 381                                   u32 ppi_size, void *data)
 382 {
 383         struct rndis_per_packet_info *ppi;
 384         int len;
 385
 386         if (rpkt->per_pkt_info_offset == 0)
 387                 return NULL;
 388
 389         /* Validate info_offset and info_len */
 390         if (rpkt->per_pkt_info_offset < sizeof(struct rndis_packet) ||
 391             rpkt->per_pkt_info_offset > rpkt_len) {
 392                 netdev_err(ndev, "Invalid per_pkt_info_offset: %u\n",
 393                            rpkt->per_pkt_info_offset);
 394                 return NULL;
 395         }
 396
 397         if (rpkt->per_pkt_info_len < sizeof(*ppi) ||
 398             rpkt->per_pkt_info_len > rpkt_len - rpkt->per_pkt_info_offset) {
 399                 netdev_err(ndev, "Invalid per_pkt_info_len: %u\n",
 400                            rpkt->per_pkt_info_len);
 401                 return NULL;
 402         }
 403
 404         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 405                 rpkt->per_pkt_info_offset);
 406         /* Copy the PPIs into nvchan->recv_buf */
 407         memcpy(ppi, data + RNDIS_HEADER_SIZE + rpkt->per_pkt_info_offset, rpkt->per_pkt_info_len);
 408         len = rpkt->per_pkt_info_len;
 409
 410         while (len > 0) {
 411                 /* Validate ppi_offset and ppi_size */
 412                 if (ppi->size > len) {
 413                         netdev_err(ndev, "Invalid ppi size: %u\n", ppi->size);
 414                         continue;
 415                 }
 416
 417                 if (ppi->ppi_offset >= ppi->size) {
 418                         netdev_err(ndev, "Invalid ppi_offset: %u\n", ppi->ppi_offset);
 419                         continue;
 420                 }
 421
 422                 if (ppi->type == type && ppi->internal == internal) {
 423                         /* ppi->size should be big enough to hold the returned object. */
 424                         if (ppi->size - ppi->ppi_offset < ppi_size) {
 425                                 netdev_err(ndev, "Invalid ppi: size %u ppi_offset %u\n",
 426                                            ppi->size, ppi->ppi_offset);
 427                                 continue;
 428                         }
 429                         return (void *)((ulong)ppi + ppi->ppi_offset);
 430                 }
 431                 len -= ppi->size;
 432                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 433         }
 434
 435         return NULL;
 436 }
 437
 438 static inline
 439 void rsc_add_data(struct netvsc_channel *nvchan,
 440                   const struct ndis_pkt_8021q_info *vlan,
 441                   const struct ndis_tcp_ip_checksum_info *csum_info,
 442                   const u32 *hash_info,
 443                   void *data, u32 len)
 444 {
 445         u32 cnt = nvchan->rsc.cnt;
 446
 447         if (cnt) {
 448                 nvchan->rsc.pktlen += len;
 449         } else {
 450                 /* The data/values pointed by vlan, csum_info and hash_info are shared
 451                  * across the different 'fragments' of the RSC packet; store them into
 452                  * the packet itself.
 453                  */
 454                 if (vlan != NULL) {
 455                         memcpy(&nvchan->rsc.vlan, vlan, sizeof(*vlan));
 456                         nvchan->rsc.ppi_flags |= NVSC_RSC_VLAN;
 457                 } else {
 458                         nvchan->rsc.ppi_flags &= ~NVSC_RSC_VLAN;
 459                 }
 460                 if (csum_info != NULL) {
 461                         memcpy(&nvchan->rsc.csum_info, csum_info, sizeof(*csum_info));
 462                         nvchan->rsc.ppi_flags |= NVSC_RSC_CSUM_INFO;
 463                 } else {
 464                         nvchan->rsc.ppi_flags &= ~NVSC_RSC_CSUM_INFO;
 465                 }
 466                 nvchan->rsc.pktlen = len;
 467                 if (hash_info != NULL) {
 468                         nvchan->rsc.hash_info = *hash_info;
 469                         nvchan->rsc.ppi_flags |= NVSC_RSC_HASH_INFO;
 470                 } else {
 471                         nvchan->rsc.ppi_flags &= ~NVSC_RSC_HASH_INFO;
 472                 }
 473         }
 474
 475         nvchan->rsc.data[cnt] = data;
 476         nvchan->rsc.len[cnt] = len;
 477         nvchan->rsc.cnt++;
 478 }
 479
 480 static int rndis_filter_receive_data(struct net_device *ndev,
 481                                      struct netvsc_device *nvdev,
 482                                      struct netvsc_channel *nvchan,
 483                                      struct rndis_message *msg,
 484                                      void *data, u32 data_buflen)
 485 {
 486         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 487         const struct ndis_tcp_ip_checksum_info *csum_info;
 488         const struct ndis_pkt_8021q_info *vlan;
 489         const struct rndis_pktinfo_id *pktinfo_id;
 490         const u32 *hash_info;
 491         u32 data_offset, rpkt_len;
 492         bool rsc_more = false;
 493         int ret;
 494
 495         /* Ensure data_buflen is big enough to read header fields */
 496         if (data_buflen < RNDIS_HEADER_SIZE + sizeof(struct rndis_packet)) {
 497                 netdev_err(ndev, "invalid rndis pkt, data_buflen too small: %u\n",
 498                            data_buflen);
 499                 return NVSP_STAT_FAIL;
 500         }
 501
 502         /* Copy the RNDIS packet into nvchan->recv_buf */
 503         memcpy(rndis_pkt, data + RNDIS_HEADER_SIZE, sizeof(*rndis_pkt));
 504
 505         /* Validate rndis_pkt offset */
 506         if (rndis_pkt->data_offset >= data_buflen - RNDIS_HEADER_SIZE) {
 507                 netdev_err(ndev, "invalid rndis packet offset: %u\n",
 508                            rndis_pkt->data_offset);
 509                 return NVSP_STAT_FAIL;
 510         }
 511
 512         /* Remove the rndis header and pass it back up the stack */
 513         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 514
 515         rpkt_len = data_buflen - RNDIS_HEADER_SIZE;
 516         data_buflen -= data_offset;
 517
 518         /*
 519          * Make sure we got a valid RNDIS message, now total_data_buflen
 520          * should be the data packet size plus the trailer padding size
 521          */
 522         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 523                 netdev_err(ndev, "rndis message buffer "
 524                            "overflow detected (got %u, min %u)"
 525                            "...dropping this message!\n",
 526                            data_buflen, rndis_pkt->data_len);
 527                 return NVSP_STAT_FAIL;
 528         }
 529
 530         vlan = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, IEEE_8021Q_INFO, 0, sizeof(*vlan),
 531                              data);
 532
 533         csum_info = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, TCPIP_CHKSUM_PKTINFO, 0,
 534                                   sizeof(*csum_info), data);
 535
 536         hash_info = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, NBL_HASH_VALUE, 0,
 537                                   sizeof(*hash_info), data);
 538
 539         pktinfo_id = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, RNDIS_PKTINFO_ID, 1,
 540                                    sizeof(*pktinfo_id), data);
 541
 542         /* Identify RSC frags, drop erroneous packets */
 543         if (pktinfo_id && (pktinfo_id->flag & RNDIS_PKTINFO_SUBALLOC)) {
 544                 if (pktinfo_id->flag & RNDIS_PKTINFO_1ST_FRAG)
 545                         nvchan->rsc.cnt = 0;
 546                 else if (nvchan->rsc.cnt == 0)
 547                         goto drop;
 548
 549                 rsc_more = true;
 550
 551                 if (pktinfo_id->flag & RNDIS_PKTINFO_LAST_FRAG)
 552                         rsc_more = false;
 553
 554                 if (rsc_more && nvchan->rsc.is_last)
 555                         goto drop;
 556         } else {
 557                 nvchan->rsc.cnt = 0;
 558         }
 559
 560         if (unlikely(nvchan->rsc.cnt >= NVSP_RSC_MAX))
 561                 goto drop;
 562
 563         /* Put data into per channel structure.
 564          * Also, remove the rndis trailer padding from rndis packet message
 565          * rndis_pkt->data_len tell us the real data length, we only copy
 566          * the data packet to the stack, without the rndis trailer padding
 567          */
 568         rsc_add_data(nvchan, vlan, csum_info, hash_info,
 569                      data + data_offset, rndis_pkt->data_len);
 570
 571         if (rsc_more)
 572                 return NVSP_STAT_SUCCESS;
 573
 574         ret = netvsc_recv_callback(ndev, nvdev, nvchan);
 575         nvchan->rsc.cnt = 0;
 576
 577         return ret;
 578
 579 drop:
 580         return NVSP_STAT_FAIL;
 581 }
 582
 583 int rndis_filter_receive(struct net_device *ndev,
 584                          struct netvsc_device *net_dev,
 585                          struct netvsc_channel *nvchan,
 586                          void *data, u32 buflen)
 587 {
 588         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 589         struct rndis_message *rndis_msg = nvchan->recv_buf;
 590
 591         if (buflen < RNDIS_HEADER_SIZE) {
 592                 netdev_err(ndev, "Invalid rndis_msg (buflen: %u)\n", buflen);
 593                 return NVSP_STAT_FAIL;
 594         }
 595
 596         /* Copy the RNDIS msg header into nvchan->recv_buf */
 597         memcpy(rndis_msg, data, RNDIS_HEADER_SIZE);
 598
 599         /* Validate incoming rndis_message packet */
 600         if (rndis_msg->msg_len < RNDIS_HEADER_SIZE ||
 601             buflen < rndis_msg->msg_len) {
 602                 netdev_err(ndev, "Invalid rndis_msg (buflen: %u, msg_len: %u)\n",
 603                            buflen, rndis_msg->msg_len);
 604                 return NVSP_STAT_FAIL;
 605         }
 606
 607         if (netif_msg_rx_status(net_device_ctx))
 608                 dump_rndis_message(ndev, rndis_msg, data);
 609
 610         switch (rndis_msg->ndis_msg_type) {
 611         case RNDIS_MSG_PACKET:
 612                 return rndis_filter_receive_data(ndev, net_dev, nvchan,
 613                                                  rndis_msg, data, buflen);
 614         case RNDIS_MSG_INIT_C:
 615         case RNDIS_MSG_QUERY_C:
 616         case RNDIS_MSG_SET_C:
 617                 /* completion msgs */
 618                 rndis_filter_receive_response(ndev, net_dev, rndis_msg, data);
 619                 break;
 620
 621         case RNDIS_MSG_INDICATE:
 622                 /* notification msgs */
 623                 netvsc_linkstatus_callback(ndev, rndis_msg, data, buflen);
 624                 break;
 625         default:
 626                 netdev_err(ndev,
 627                         "unhandled rndis message (type %u len %u)\n",
 628                            rndis_msg->ndis_msg_type,
 629                            rndis_msg->msg_len);
 630                 return NVSP_STAT_FAIL;
 631         }
 632
 633         return NVSP_STAT_SUCCESS;
 634 }
 635
 636 static int rndis_filter_query_device(struct rndis_device *dev,
 637                                      struct netvsc_device *nvdev,
 638                                      u32 oid, void *result, u32 *result_size)
 639 {
 640         struct rndis_request *request;
 641         u32 inresult_size = *result_size;
 642         struct rndis_query_request *query;
 643         struct rndis_query_complete *query_complete;
 644         u32 msg_len;
 645         int ret = 0;
 646
 647         if (!result)
 648                 return -EINVAL;
 649
 650         *result_size = 0;
 651         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 652                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 653         if (!request) {
 654                 ret = -ENOMEM;
 655                 goto cleanup;
 656         }
 657
 658         /* Setup the rndis query */
 659         query = &request->request_msg.msg.query_req;
 660         query->oid = oid;
 661         query->info_buf_offset = sizeof(struct rndis_query_request);
 662         query->info_buflen = 0;
 663         query->dev_vc_handle = 0;
 664
 665         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 666                 struct ndis_offload *hwcaps;
 667                 u32 nvsp_version = nvdev->nvsp_version;
 668                 u8 ndis_rev;
 669                 size_t size;
 670
 671                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 672                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 673                         size = NDIS_OFFLOAD_SIZE;
 674                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 675                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 676                         size = NDIS_OFFLOAD_SIZE_6_1;
 677                 } else {
 678                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 679                         size = NDIS_OFFLOAD_SIZE_6_0;
 680                 }
 681
 682                 request->request_msg.msg_len += size;
 683                 query->info_buflen = size;
 684                 hwcaps = (struct ndis_offload *)
 685                         ((unsigned long)query + query->info_buf_offset);
 686
 687                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 688                 hwcaps->header.revision = ndis_rev;
 689                 hwcaps->header.size = size;
 690
 691         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 692                 struct ndis_recv_scale_cap *cap;
 693
 694                 request->request_msg.msg_len +=
 695                         sizeof(struct ndis_recv_scale_cap);
 696                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 697                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 698                                                      query->info_buf_offset);
 699                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 700                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 701                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 702         }
 703
 704         ret = rndis_filter_send_request(dev, request);
 705         if (ret != 0)
 706                 goto cleanup;
 707
 708         wait_for_completion(&request->wait_event);
 709
 710         /* Copy the response back */
 711         query_complete = &request->response_msg.msg.query_complete;
 712         msg_len = request->response_msg.msg_len;
 713
 714         /* Ensure the packet is big enough to access its fields */
 715         if (msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_query_complete)) {
 716                 ret = -1;
 717                 goto cleanup;
 718         }
 719
 720         if (query_complete->info_buflen > inresult_size ||
 721             query_complete->info_buf_offset < sizeof(*query_complete) ||
 722             msg_len - RNDIS_HEADER_SIZE < query_complete->info_buf_offset ||
 723             msg_len - RNDIS_HEADER_SIZE - query_complete->info_buf_offset
 724                         < query_complete->info_buflen) {
 725                 ret = -1;
 726                 goto cleanup;
 727         }
 728
 729         memcpy(result,
 730                (void *)((unsigned long)query_complete +
 731                          query_complete->info_buf_offset),
 732                query_complete->info_buflen);
 733
 734         *result_size = query_complete->info_buflen;
 735
 736 cleanup:
 737         if (request)
 738                 put_rndis_request(dev, request);
 739
 740         return ret;
 741 }
 742
 743 /* Get the hardware offload capabilities */
 744 static int
 745 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 746                    struct ndis_offload *caps)
 747 {
 748         u32 caps_len = sizeof(*caps);
 749         int ret;
 750
 751         memset(caps, 0, sizeof(*caps));
 752
 753         ret = rndis_filter_query_device(dev, net_device,
 754                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 755                                         caps, &caps_len);
 756         if (ret)
 757                 return ret;
 758
 759         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 760                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 761                             caps->header.type);
 762                 return -EINVAL;
 763         }
 764
 765         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 766                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 767                             caps->header.revision);
 768                 return -EINVAL;
 769         }
 770
 771         if (caps->header.size > caps_len ||
 772             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 773                 netdev_warn(dev->ndev,
 774                             "invalid NDIS objsize %u, data size %u\n",
 775                             caps->header.size, caps_len);
 776                 return -EINVAL;
 777         }
 778
 779         return 0;
 780 }
 781
 782 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 783                                          struct netvsc_device *net_device)
 784 {
 785         u32 size = ETH_ALEN;
 786
 787         return rndis_filter_query_device(dev, net_device,
 788                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 789                                       dev->hw_mac_adr, &size);
 790 }
 791
 792 #define NWADR_STR "NetworkAddress"
 793 #define NWADR_STRLEN 14
 794
 795 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 796                                 const char *mac)
 797 {
 798         struct rndis_device *rdev = nvdev->extension;
 799         struct rndis_request *request;
 800         struct rndis_set_request *set;
 801         struct rndis_config_parameter_info *cpi;
 802         wchar_t *cfg_nwadr, *cfg_mac;
 803         struct rndis_set_complete *set_complete;
 804         char macstr[2*ETH_ALEN+1];
 805         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 806                 2*NWADR_STRLEN + 4*ETH_ALEN;
 807         int ret;
 808
 809         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 810                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 811         if (!request)
 812                 return -ENOMEM;
 813
 814         set = &request->request_msg.msg.set_req;
 815         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 816         set->info_buflen = extlen;
 817         set->info_buf_offset = sizeof(struct rndis_set_request);
 818         set->dev_vc_handle = 0;
 819
 820         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 821                 set->info_buf_offset);
 822         cpi->parameter_name_offset =
 823                 sizeof(struct rndis_config_parameter_info);
 824         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 825         cpi->parameter_name_length = 2*NWADR_STRLEN;
 826         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 827         cpi->parameter_value_offset =
 828                 cpi->parameter_name_offset + cpi->parameter_name_length;
 829         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 830         cpi->parameter_value_length = 4*ETH_ALEN;
 831
 832         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 833         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 834         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 835                               cfg_nwadr, NWADR_STRLEN);
 836         if (ret < 0)
 837                 goto cleanup;
 838         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 839         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 840                               cfg_mac, 2*ETH_ALEN);
 841         if (ret < 0)
 842                 goto cleanup;
 843
 844         ret = rndis_filter_send_request(rdev, request);
 845         if (ret != 0)
 846                 goto cleanup;
 847
 848         wait_for_completion(&request->wait_event);
 849
 850         set_complete = &request->response_msg.msg.set_complete;
 851         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 852                 ret = -EIO;
 853
 854 cleanup:
 855         put_rndis_request(rdev, request);
 856         return ret;
 857 }
 858
 859 int
 860 rndis_filter_set_offload_params(struct net_device *ndev,
 861                                 struct netvsc_device *nvdev,
 862                                 struct ndis_offload_params *req_offloads)
 863 {
 864         struct rndis_device *rdev = nvdev->extension;
 865         struct rndis_request *request;
 866         struct rndis_set_request *set;
 867         struct ndis_offload_params *offload_params;
 868         struct rndis_set_complete *set_complete;
 869         u32 extlen = sizeof(struct ndis_offload_params);
 870         int ret;
 871         u32 vsp_version = nvdev->nvsp_version;
 872
 873         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 874                 extlen = VERSION_4_OFFLOAD_SIZE;
 875                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 876                  * UDP checksum offload.
 877                  */
 878                 req_offloads->udp_ip_v4_csum = 0;
 879                 req_offloads->udp_ip_v6_csum = 0;
 880         }
 881
 882         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 883                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 884         if (!request)
 885                 return -ENOMEM;
 886
 887         set = &request->request_msg.msg.set_req;
 888         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 889         set->info_buflen = extlen;
 890         set->info_buf_offset = sizeof(struct rndis_set_request);
 891         set->dev_vc_handle = 0;
 892
 893         offload_params = (struct ndis_offload_params *)((ulong)set +
 894                                 set->info_buf_offset);
 895         *offload_params = *req_offloads;
 896         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 897         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 898         offload_params->header.size = extlen;
 899
 900         ret = rndis_filter_send_request(rdev, request);
 901         if (ret != 0)
 902                 goto cleanup;
 903
 904         wait_for_completion(&request->wait_event);
 905         set_complete = &request->response_msg.msg.set_complete;
 906         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 907                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 908                            set_complete->status);
 909                 ret = -EINVAL;
 910         }
 911
 912 cleanup:
 913         put_rndis_request(rdev, request);
 914         return ret;
 915 }
 916
 917 static int rndis_set_rss_param_msg(struct rndis_device *rdev,
 918                                    const u8 *rss_key, u16 flag)
 919 {
 920         struct net_device *ndev = rdev->ndev;
 921         struct net_device_context *ndc = netdev_priv(ndev);
 922         struct rndis_request *request;
 923         struct rndis_set_request *set;
 924         struct rndis_set_complete *set_complete;
 925         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 926                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 927         struct ndis_recv_scale_param *rssp;
 928         u32 *itab;
 929         u8 *keyp;
 930         int i, ret;
 931
 932         request = get_rndis_request(
 933                         rdev, RNDIS_MSG_SET,
 934                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 935         if (!request)
 936                 return -ENOMEM;
 937
 938         set = &request->request_msg.msg.set_req;
 939         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 940         set->info_buflen = extlen;
 941         set->info_buf_offset = sizeof(struct rndis_set_request);
 942         set->dev_vc_handle = 0;
 943
 944         rssp = (struct ndis_recv_scale_param *)(set + 1);
 945         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 946         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 947         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 948         rssp->flag = flag;
 949         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 950                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 951                          NDIS_HASH_TCP_IPV6;
 952         rssp->indirect_tabsize = 4*ITAB_NUM;
 953         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 954         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 955         rssp->hashkey_offset = rssp->indirect_taboffset +
 956                                rssp->indirect_tabsize;
 957
 958         /* Set indirection table entries */
 959         itab = (u32 *)(rssp + 1);
 960         for (i = 0; i < ITAB_NUM; i++)
 961                 itab[i] = ndc->rx_table[i];
 962
 963         /* Set hask key values */
 964         keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
 965         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 966
 967         ret = rndis_filter_send_request(rdev, request);
 968         if (ret != 0)
 969                 goto cleanup;
 970
 971         wait_for_completion(&request->wait_event);
 972         set_complete = &request->response_msg.msg.set_complete;
 973         if (set_complete->status == RNDIS_STATUS_SUCCESS) {
 974                 if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
 975                     !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
 976                         memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 977
 978         } else {
 979                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 980                            set_complete->status);
 981                 ret = -EINVAL;
 982         }
 983
 984 cleanup:
 985         put_rndis_request(rdev, request);
 986         return ret;
 987 }
 988
 989 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 990                                const u8 *rss_key)
 991 {
 992         /* Disable RSS before change */
 993         rndis_set_rss_param_msg(rdev, rss_key,
 994                                 NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
 995
 996         return rndis_set_rss_param_msg(rdev, rss_key, 0);
 997 }
 998
 999 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
1000                                                  struct netvsc_device *net_device)
1001 {
1002         u32 size = sizeof(u32);
1003         u32 link_status;
1004
1005         return rndis_filter_query_device(dev, net_device,
1006                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
1007                                          &link_status, &size);
1008 }
1009
1010 static int rndis_filter_query_link_speed(struct rndis_device *dev,
1011                                          struct netvsc_device *net_device)
1012 {
1013         u32 size = sizeof(u32);
1014         u32 link_speed;
1015         struct net_device_context *ndc;
1016         int ret;
1017
1018         ret = rndis_filter_query_device(dev, net_device,
1019                                         RNDIS_OID_GEN_LINK_SPEED,
1020                                         &link_speed, &size);
1021
1022         if (!ret) {
1023                 ndc = netdev_priv(dev->ndev);
1024
1025                 /* The link speed reported from host is in 100bps unit, so
1026                  * we convert it to Mbps here.
1027                  */
1028                 ndc->speed = link_speed / 10000;
1029         }
1030
1031         return ret;
1032 }
1033
1034 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
1035                                           u32 new_filter)
1036 {
1037         struct rndis_request *request;
1038         struct rndis_set_request *set;
1039         int ret;
1040
1041         if (dev->filter == new_filter)
1042                 return 0;
1043
1044         request = get_rndis_request(dev, RNDIS_MSG_SET,
1045                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
1046                         sizeof(u32));
1047         if (!request)
1048                 return -ENOMEM;
1049
1050         /* Setup the rndis set */
1051         set = &request->request_msg.msg.set_req;
1052         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
1053         set->info_buflen = sizeof(u32);
1054         set->info_buf_offset = offsetof(typeof(*set), info_buf);
1055         memcpy(set->info_buf, &new_filter, sizeof(u32));
1056
1057         ret = rndis_filter_send_request(dev, request);
1058         if (ret == 0) {
1059                 wait_for_completion(&request->wait_event);
1060                 dev->filter = new_filter;
1061         }
1062
1063         put_rndis_request(dev, request);
1064
1065         return ret;
1066 }
1067
1068 static void rndis_set_multicast(struct work_struct *w)
1069 {
1070         struct rndis_device *rdev
1071                 = container_of(w, struct rndis_device, mcast_work);
1072         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
1073         unsigned int flags = rdev->ndev->flags;
1074
1075         if (flags & IFF_PROMISC) {
1076                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
1077         } else {
1078                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
1079                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
1080                 if (flags & IFF_BROADCAST)
1081                         filter |= NDIS_PACKET_TYPE_BROADCAST;
1082         }
1083
1084         rndis_filter_set_packet_filter(rdev, filter);
1085 }
1086
1087 void rndis_filter_update(struct netvsc_device *nvdev)
1088 {
1089         struct rndis_device *rdev = nvdev->extension;
1090
1091         schedule_work(&rdev->mcast_work);
1092 }
1093
1094 static int rndis_filter_init_device(struct rndis_device *dev,
1095                                     struct netvsc_device *nvdev)
1096 {
1097         struct rndis_request *request;
1098         struct rndis_initialize_request *init;
1099         struct rndis_initialize_complete *init_complete;
1100         u32 status;
1101         int ret;
1102
1103         request = get_rndis_request(dev, RNDIS_MSG_INIT,
1104                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
1105         if (!request) {
1106                 ret = -ENOMEM;
1107                 goto cleanup;
1108         }
1109
1110         /* Setup the rndis set */
1111         init = &request->request_msg.msg.init_req;
1112         init->major_ver = RNDIS_MAJOR_VERSION;
1113         init->minor_ver = RNDIS_MINOR_VERSION;
1114         init->max_xfer_size = 0x4000;
1115
1116         dev->state = RNDIS_DEV_INITIALIZING;
1117
1118         ret = rndis_filter_send_request(dev, request);
1119         if (ret != 0) {
1120                 dev->state = RNDIS_DEV_UNINITIALIZED;
1121                 goto cleanup;
1122         }
1123
1124         wait_for_completion(&request->wait_event);
1125
1126         init_complete = &request->response_msg.msg.init_complete;
1127         status = init_complete->status;
1128         if (status == RNDIS_STATUS_SUCCESS) {
1129                 dev->state = RNDIS_DEV_INITIALIZED;
1130                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
1131                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
1132                 ret = 0;
1133         } else {
1134                 dev->state = RNDIS_DEV_UNINITIALIZED;
1135                 ret = -EINVAL;
1136         }
1137
1138 cleanup:
1139         if (request)
1140                 put_rndis_request(dev, request);
1141
1142         return ret;
1143 }
1144
1145 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
1146 {
1147         int i;
1148
1149         for (i = 0; i < nvdev->num_chn; i++) {
1150                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1151
1152                 if (nvchan->mrc.first != nvchan->mrc.next)
1153                         return false;
1154
1155                 if (atomic_read(&nvchan->queue_sends) > 0)
1156                         return false;
1157         }
1158
1159         return true;
1160 }
1161
1162 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
1163                                      struct rndis_device *dev)
1164 {
1165         struct rndis_request *request;
1166         struct rndis_halt_request *halt;
1167
1168         /* Attempt to do a rndis device halt */
1169         request = get_rndis_request(dev, RNDIS_MSG_HALT,
1170                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
1171         if (!request)
1172                 goto cleanup;
1173
1174         /* Setup the rndis set */
1175         halt = &request->request_msg.msg.halt_req;
1176         halt->req_id = atomic_inc_return(&dev->new_req_id);
1177
1178         /* Ignore return since this msg is optional. */
1179         rndis_filter_send_request(dev, request);
1180
1181         dev->state = RNDIS_DEV_UNINITIALIZED;
1182
1183 cleanup:
1184         nvdev->destroy = true;
1185
1186         /* Force flag to be ordered before waiting */
1187         wmb();
1188
1189         /* Wait for all send completions */
1190         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
1191
1192         if (request)
1193                 put_rndis_request(dev, request);
1194 }
1195
1196 static int rndis_filter_open_device(struct rndis_device *dev)
1197 {
1198         int ret;
1199
1200         if (dev->state != RNDIS_DEV_INITIALIZED)
1201                 return 0;
1202
1203         ret = rndis_filter_set_packet_filter(dev,
1204                                          NDIS_PACKET_TYPE_BROADCAST |
1205                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1206                                          NDIS_PACKET_TYPE_DIRECTED);
1207         if (ret == 0)
1208                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1209
1210         return ret;
1211 }
1212
1213 static int rndis_filter_close_device(struct rndis_device *dev)
1214 {
1215         int ret;
1216
1217         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1218                 return 0;
1219
1220         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1221         cancel_work_sync(&dev->mcast_work);
1222
1223         ret = rndis_filter_set_packet_filter(dev, 0);
1224         if (ret == -ENODEV)
1225                 ret = 0;
1226
1227         if (ret == 0)
1228                 dev->state = RNDIS_DEV_INITIALIZED;
1229
1230         return ret;
1231 }
1232
1233 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1234 {
1235         struct net_device *ndev =
1236                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1237         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1238         struct netvsc_device *nvscdev;
1239         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1240         struct netvsc_channel *nvchan;
1241         int ret;
1242
1243         /* This is safe because this callback only happens when
1244          * new device is being setup and waiting on the channel_init_wait.
1245          */
1246         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1247         if (!nvscdev || chn_index >= nvscdev->num_chn)
1248                 return;
1249
1250         nvchan = nvscdev->chan_table + chn_index;
1251
1252         /* Because the device uses NAPI, all the interrupt batching and
1253          * control is done via Net softirq, not the channel handling
1254          */
1255         set_channel_read_mode(new_sc, HV_CALL_ISR);
1256
1257         /* Set the channel before opening.*/
1258         nvchan->channel = new_sc;
1259
1260         new_sc->next_request_id_callback = vmbus_next_request_id;
1261         new_sc->request_addr_callback = vmbus_request_addr;
1262         new_sc->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
1263         new_sc->max_pkt_size = NETVSC_MAX_PKT_SIZE;
1264
1265         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1266                          netvsc_ring_bytes, NULL, 0,
1267                          netvsc_channel_cb, nvchan);
1268         if (ret == 0)
1269                 napi_enable(&nvchan->napi);
1270         else
1271                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1272
1273         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1274                 wake_up(&nvscdev->subchan_open);
1275 }
1276
1277 /* Open sub-channels after completing the handling of the device probe.
1278  * This breaks overlap of processing the host message for the
1279  * new primary channel with the initialization of sub-channels.
1280  */
1281 int rndis_set_subchannel(struct net_device *ndev,
1282                          struct netvsc_device *nvdev,
1283                          struct netvsc_device_info *dev_info)
1284 {
1285         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1286         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1287         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1288         struct rndis_device *rdev = nvdev->extension;
1289         int i, ret;
1290
1291         ASSERT_RTNL();
1292
1293         memset(init_packet, 0, sizeof(struct nvsp_message));
1294         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1295         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1296         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1297                                                 nvdev->num_chn - 1;
1298         trace_nvsp_send(ndev, init_packet);
1299
1300         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1301                                sizeof(struct nvsp_message),
1302                                (unsigned long)init_packet,
1303                                VM_PKT_DATA_INBAND,
1304                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1305         if (ret) {
1306                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1307                 return ret;
1308         }
1309
1310         wait_for_completion(&nvdev->channel_init_wait);
1311         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1312                 netdev_err(ndev, "sub channel request failed\n");
1313                 return -EIO;
1314         }
1315
1316         /* Check that number of allocated sub channel is within the expected range */
1317         if (init_packet->msg.v5_msg.subchn_comp.num_subchannels > nvdev->num_chn - 1) {
1318                 netdev_err(ndev, "invalid number of allocated sub channel\n");
1319                 return -EINVAL;
1320         }
1321         nvdev->num_chn = 1 +
1322                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1323
1324         /* wait for all sub channels to open */
1325         wait_event(nvdev->subchan_open,
1326                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1327
1328         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1329                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1330
1331         /* ignore failures from setting rss parameters, still have channels */
1332         if (dev_info)
1333                 rndis_filter_set_rss_param(rdev, dev_info->rss_key);
1334         else
1335                 rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1336
1337         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1338         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1339
1340         return 0;
1341 }
1342
1343 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1344                                    struct netvsc_device *nvdev)
1345 {
1346         struct net_device *net = rndis_device->ndev;
1347         struct net_device_context *net_device_ctx = netdev_priv(net);
1348         struct ndis_offload hwcaps;
1349         struct ndis_offload_params offloads;
1350         unsigned int gso_max_size = GSO_MAX_SIZE;
1351         int ret;
1352
1353         /* Find HW offload capabilities */
1354         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1355         if (ret != 0)
1356                 return ret;
1357
1358         /* A value of zero means "no change"; now turn on what we want. */
1359         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1360
1361         /* Linux does not care about IP checksum, always does in kernel */
1362         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1363
1364         /* Reset previously set hw_features flags */
1365         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1366         net_device_ctx->tx_checksum_mask = 0;
1367
1368         /* Compute tx offload settings based on hw capabilities */
1369         net->hw_features |= NETIF_F_RXCSUM;
1370         net->hw_features |= NETIF_F_SG;
1371         net->hw_features |= NETIF_F_RXHASH;
1372
1373         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1374                 /* Can checksum TCP */
1375                 net->hw_features |= NETIF_F_IP_CSUM;
1376                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1377
1378                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1379
1380                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1381                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1382                         net->hw_features |= NETIF_F_TSO;
1383
1384                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1385                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1386                 }
1387
1388                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1389                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1390                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1391                 }
1392         }
1393
1394         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1395                 net->hw_features |= NETIF_F_IPV6_CSUM;
1396
1397                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1398                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1399
1400                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1401                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1402                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1403                         net->hw_features |= NETIF_F_TSO6;
1404
1405                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1406                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1407                 }
1408
1409                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1410                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1411                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1412                 }
1413         }
1414
1415         if (hwcaps.rsc.ip4 && hwcaps.rsc.ip6) {
1416                 net->hw_features |= NETIF_F_LRO;
1417
1418                 if (net->features & NETIF_F_LRO) {
1419                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1420                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1421                 } else {
1422                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1423                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1424                 }
1425         }
1426
1427         /* In case some hw_features disappeared we need to remove them from
1428          * net->features list as they're no longer supported.
1429          */
1430         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1431
1432         netif_set_gso_max_size(net, gso_max_size);
1433
1434         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1435
1436         return ret;
1437 }
1438
1439 static void rndis_get_friendly_name(struct net_device *net,
1440                                     struct rndis_device *rndis_device,
1441                                     struct netvsc_device *net_device)
1442 {
1443         ucs2_char_t wname[256];
1444         unsigned long len;
1445         u8 ifalias[256];
1446         u32 size;
1447
1448         size = sizeof(wname);
1449         if (rndis_filter_query_device(rndis_device, net_device,
1450                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1451                                       wname, &size) != 0)
1452                 return; /* ignore if host does not support */
1453
1454         if (size == 0)
1455                 return; /* name not set */
1456
1457         /* Convert Windows Unicode string to UTF-8 */
1458         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1459
1460         /* ignore the default value from host */
1461         if (strcmp(ifalias, "Network Adapter") != 0)
1462                 dev_set_alias(net, ifalias, len);
1463 }
1464
1465 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1466                                       struct netvsc_device_info *device_info)
1467 {
1468         struct net_device *net = hv_get_drvdata(dev);
1469         struct net_device_context *ndc = netdev_priv(net);
1470         struct netvsc_device *net_device;
1471         struct rndis_device *rndis_device;
1472         struct ndis_recv_scale_cap rsscap;
1473         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1474         u32 mtu, size;
1475         u32 num_possible_rss_qs;
1476         int i, ret;
1477
1478         rndis_device = get_rndis_device();
1479         if (!rndis_device)
1480                 return ERR_PTR(-ENODEV);
1481
1482         /* Let the inner driver handle this first to create the netvsc channel
1483          * NOTE! Once the channel is created, we may get a receive callback
1484          * (RndisFilterOnReceive()) before this call is completed
1485          */
1486         net_device = netvsc_device_add(dev, device_info);
1487         if (IS_ERR(net_device)) {
1488                 kfree(rndis_device);
1489                 return net_device;
1490         }
1491
1492         /* Initialize the rndis device */
1493         net_device->max_chn = 1;
1494         net_device->num_chn = 1;
1495
1496         net_device->extension = rndis_device;
1497         rndis_device->ndev = net;
1498
1499         /* Send the rndis initialization message */
1500         ret = rndis_filter_init_device(rndis_device, net_device);
1501         if (ret != 0)
1502                 goto err_dev_remv;
1503
1504         /* Get the MTU from the host */
1505         size = sizeof(u32);
1506         ret = rndis_filter_query_device(rndis_device, net_device,
1507                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1508                                         &mtu, &size);
1509         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1510                 net->mtu = mtu;
1511
1512         /* Get the mac address */
1513         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1514         if (ret != 0)
1515                 goto err_dev_remv;
1516
1517         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1518
1519         /* Get friendly name as ifalias*/
1520         if (!net->ifalias)
1521                 rndis_get_friendly_name(net, rndis_device, net_device);
1522
1523         /* Query and set hardware capabilities */
1524         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1525         if (ret != 0)
1526                 goto err_dev_remv;
1527
1528         rndis_filter_query_device_link_status(rndis_device, net_device);
1529
1530         netdev_dbg(net, "Device MAC %pM link state %s\n",
1531                    rndis_device->hw_mac_adr,
1532                    rndis_device->link_state ? "down" : "up");
1533
1534         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1535                 goto out;
1536
1537         rndis_filter_query_link_speed(rndis_device, net_device);
1538
1539         /* vRSS setup */
1540         memset(&rsscap, 0, rsscap_size);
1541         ret = rndis_filter_query_device(rndis_device, net_device,
1542                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1543                                         &rsscap, &rsscap_size);
1544         if (ret || rsscap.num_recv_que < 2)
1545                 goto out;
1546
1547         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1548         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1549                                     rsscap.num_recv_que);
1550
1551         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1552
1553         /* We will use the given number of channels if available. */
1554         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1555
1556         if (!netif_is_rxfh_configured(net)) {
1557                 for (i = 0; i < ITAB_NUM; i++)
1558                         ndc->rx_table[i] = ethtool_rxfh_indir_default(
1559                                                 i, net_device->num_chn);
1560         }
1561
1562         atomic_set(&net_device->open_chn, 1);
1563         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1564
1565         for (i = 1; i < net_device->num_chn; i++) {
1566                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1567                 if (ret) {
1568                         while (--i != 0)
1569                                 vfree(net_device->chan_table[i].mrc.slots);
1570                         goto out;
1571                 }
1572         }
1573
1574         for (i = 1; i < net_device->num_chn; i++)
1575                 netif_napi_add(net, &net_device->chan_table[i].napi,
1576                                netvsc_poll, NAPI_POLL_WEIGHT);
1577
1578         return net_device;
1579
1580 out:
1581         /* setting up multiple channels failed */
1582         net_device->max_chn = 1;
1583         net_device->num_chn = 1;
1584         return net_device;
1585
1586 err_dev_remv:
1587         rndis_filter_device_remove(dev, net_device);
1588         return ERR_PTR(ret);
1589 }
1590
1591 void rndis_filter_device_remove(struct hv_device *dev,
1592                                 struct netvsc_device *net_dev)
1593 {
1594         struct rndis_device *rndis_dev = net_dev->extension;
1595
1596         /* Halt and release the rndis device */
1597         rndis_filter_halt_device(net_dev, rndis_dev);
1598
1599         netvsc_device_remove(dev);
1600 }
1601
1602 int rndis_filter_open(struct netvsc_device *nvdev)
1603 {
1604         if (!nvdev)
1605                 return -EINVAL;
1606
1607         return rndis_filter_open_device(nvdev->extension);
1608 }
1609
1610 int rndis_filter_close(struct netvsc_device *nvdev)
1611 {
1612         if (!nvdev)
1613                 return -EINVAL;
1614
1615         return rndis_filter_close_device(nvdev->extension);
1616 }