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                 netvsc_dma_unmap(((struct net_device_context *)
 365                         netdev_priv(ndev))->device_ctx, &request->pkt);
 366                 complete(&request->wait_event);
 367         } else {
 368                 netdev_err(ndev,
 369                         "no rndis request found for this response "
 370                         "(id 0x%x res type 0x%x)\n",
 371                         *req_id,
 372                         resp->ndis_msg_type);
 373         }
 374 }
 375
 376 /*
 377  * Get the Per-Packet-Info with the specified type
 378  * return NULL if not found.
 379  */
 380 static inline void *rndis_get_ppi(struct net_device *ndev,
 381                                   struct rndis_packet *rpkt,
 382                                   u32 rpkt_len, u32 type, u8 internal,
 383                                   u32 ppi_size, void *data)
 384 {
 385         struct rndis_per_packet_info *ppi;
 386         int len;
 387
 388         if (rpkt->per_pkt_info_offset == 0)
 389                 return NULL;
 390
 391         /* Validate info_offset and info_len */
 392         if (rpkt->per_pkt_info_offset < sizeof(struct rndis_packet) ||
 393             rpkt->per_pkt_info_offset > rpkt_len) {
 394                 netdev_err(ndev, "Invalid per_pkt_info_offset: %u\n",
 395                            rpkt->per_pkt_info_offset);
 396                 return NULL;
 397         }
 398
 399         if (rpkt->per_pkt_info_len < sizeof(*ppi) ||
 400             rpkt->per_pkt_info_len > rpkt_len - rpkt->per_pkt_info_offset) {
 401                 netdev_err(ndev, "Invalid per_pkt_info_len: %u\n",
 402                            rpkt->per_pkt_info_len);
 403                 return NULL;
 404         }
 405
 406         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 407                 rpkt->per_pkt_info_offset);
 408         /* Copy the PPIs into nvchan->recv_buf */
 409         memcpy(ppi, data + RNDIS_HEADER_SIZE + rpkt->per_pkt_info_offset, rpkt->per_pkt_info_len);
 410         len = rpkt->per_pkt_info_len;
 411
 412         while (len > 0) {
 413                 /* Validate ppi_offset and ppi_size */
 414                 if (ppi->size > len) {
 415                         netdev_err(ndev, "Invalid ppi size: %u\n", ppi->size);
 416                         continue;
 417                 }
 418
 419                 if (ppi->ppi_offset >= ppi->size) {
 420                         netdev_err(ndev, "Invalid ppi_offset: %u\n", ppi->ppi_offset);
 421                         continue;
 422                 }
 423
 424                 if (ppi->type == type && ppi->internal == internal) {
 425                         /* ppi->size should be big enough to hold the returned object. */
 426                         if (ppi->size - ppi->ppi_offset < ppi_size) {
 427                                 netdev_err(ndev, "Invalid ppi: size %u ppi_offset %u\n",
 428                                            ppi->size, ppi->ppi_offset);
 429                                 continue;
 430                         }
 431                         return (void *)((ulong)ppi + ppi->ppi_offset);
 432                 }
 433                 len -= ppi->size;
 434                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 435         }
 436
 437         return NULL;
 438 }
 439
 440 static inline
 441 void rsc_add_data(struct netvsc_channel *nvchan,
 442                   const struct ndis_pkt_8021q_info *vlan,
 443                   const struct ndis_tcp_ip_checksum_info *csum_info,
 444                   const u32 *hash_info,
 445                   void *data, u32 len)
 446 {
 447         u32 cnt = nvchan->rsc.cnt;
 448
 449         if (cnt) {
 450                 nvchan->rsc.pktlen += len;
 451         } else {
 452                 /* The data/values pointed by vlan, csum_info and hash_info are shared
 453                  * across the different 'fragments' of the RSC packet; store them into
 454                  * the packet itself.
 455                  */
 456                 if (vlan != NULL) {
 457                         memcpy(&nvchan->rsc.vlan, vlan, sizeof(*vlan));
 458                         nvchan->rsc.ppi_flags |= NVSC_RSC_VLAN;
 459                 } else {
 460                         nvchan->rsc.ppi_flags &= ~NVSC_RSC_VLAN;
 461                 }
 462                 if (csum_info != NULL) {
 463                         memcpy(&nvchan->rsc.csum_info, csum_info, sizeof(*csum_info));
 464                         nvchan->rsc.ppi_flags |= NVSC_RSC_CSUM_INFO;
 465                 } else {
 466                         nvchan->rsc.ppi_flags &= ~NVSC_RSC_CSUM_INFO;
 467                 }
 468                 nvchan->rsc.pktlen = len;
 469                 if (hash_info != NULL) {
 470                         nvchan->rsc.hash_info = *hash_info;
 471                         nvchan->rsc.ppi_flags |= NVSC_RSC_HASH_INFO;
 472                 } else {
 473                         nvchan->rsc.ppi_flags &= ~NVSC_RSC_HASH_INFO;
 474                 }
 475         }
 476
 477         nvchan->rsc.data[cnt] = data;
 478         nvchan->rsc.len[cnt] = len;
 479         nvchan->rsc.cnt++;
 480 }
 481
 482 static int rndis_filter_receive_data(struct net_device *ndev,
 483                                      struct netvsc_device *nvdev,
 484                                      struct netvsc_channel *nvchan,
 485                                      struct rndis_message *msg,
 486                                      void *data, u32 data_buflen)
 487 {
 488         struct rndis_packet *rndis_pkt = &msg->msg.pkt;
 489         const struct ndis_tcp_ip_checksum_info *csum_info;
 490         const struct ndis_pkt_8021q_info *vlan;
 491         const struct rndis_pktinfo_id *pktinfo_id;
 492         const u32 *hash_info;
 493         u32 data_offset, rpkt_len;
 494         bool rsc_more = false;
 495         int ret;
 496
 497         /* Ensure data_buflen is big enough to read header fields */
 498         if (data_buflen < RNDIS_HEADER_SIZE + sizeof(struct rndis_packet)) {
 499                 netdev_err(ndev, "invalid rndis pkt, data_buflen too small: %u\n",
 500                            data_buflen);
 501                 return NVSP_STAT_FAIL;
 502         }
 503
 504         /* Copy the RNDIS packet into nvchan->recv_buf */
 505         memcpy(rndis_pkt, data + RNDIS_HEADER_SIZE, sizeof(*rndis_pkt));
 506
 507         /* Validate rndis_pkt offset */
 508         if (rndis_pkt->data_offset >= data_buflen - RNDIS_HEADER_SIZE) {
 509                 netdev_err(ndev, "invalid rndis packet offset: %u\n",
 510                            rndis_pkt->data_offset);
 511                 return NVSP_STAT_FAIL;
 512         }
 513
 514         /* Remove the rndis header and pass it back up the stack */
 515         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 516
 517         rpkt_len = data_buflen - RNDIS_HEADER_SIZE;
 518         data_buflen -= data_offset;
 519
 520         /*
 521          * Make sure we got a valid RNDIS message, now total_data_buflen
 522          * should be the data packet size plus the trailer padding size
 523          */
 524         if (unlikely(data_buflen < rndis_pkt->data_len)) {
 525                 netdev_err(ndev, "rndis message buffer "
 526                            "overflow detected (got %u, min %u)"
 527                            "...dropping this message!\n",
 528                            data_buflen, rndis_pkt->data_len);
 529                 return NVSP_STAT_FAIL;
 530         }
 531
 532         vlan = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, IEEE_8021Q_INFO, 0, sizeof(*vlan),
 533                              data);
 534
 535         csum_info = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, TCPIP_CHKSUM_PKTINFO, 0,
 536                                   sizeof(*csum_info), data);
 537
 538         hash_info = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, NBL_HASH_VALUE, 0,
 539                                   sizeof(*hash_info), data);
 540
 541         pktinfo_id = rndis_get_ppi(ndev, rndis_pkt, rpkt_len, RNDIS_PKTINFO_ID, 1,
 542                                    sizeof(*pktinfo_id), data);
 543
 544         /* Identify RSC frags, drop erroneous packets */
 545         if (pktinfo_id && (pktinfo_id->flag & RNDIS_PKTINFO_SUBALLOC)) {
 546                 if (pktinfo_id->flag & RNDIS_PKTINFO_1ST_FRAG)
 547                         nvchan->rsc.cnt = 0;
 548                 else if (nvchan->rsc.cnt == 0)
 549                         goto drop;
 550
 551                 rsc_more = true;
 552
 553                 if (pktinfo_id->flag & RNDIS_PKTINFO_LAST_FRAG)
 554                         rsc_more = false;
 555
 556                 if (rsc_more && nvchan->rsc.is_last)
 557                         goto drop;
 558         } else {
 559                 nvchan->rsc.cnt = 0;
 560         }
 561
 562         if (unlikely(nvchan->rsc.cnt >= NVSP_RSC_MAX))
 563                 goto drop;
 564
 565         /* Put data into per channel structure.
 566          * Also, remove the rndis trailer padding from rndis packet message
 567          * rndis_pkt->data_len tell us the real data length, we only copy
 568          * the data packet to the stack, without the rndis trailer padding
 569          */
 570         rsc_add_data(nvchan, vlan, csum_info, hash_info,
 571                      data + data_offset, rndis_pkt->data_len);
 572
 573         if (rsc_more)
 574                 return NVSP_STAT_SUCCESS;
 575
 576         ret = netvsc_recv_callback(ndev, nvdev, nvchan);
 577         nvchan->rsc.cnt = 0;
 578
 579         return ret;
 580
 581 drop:
 582         return NVSP_STAT_FAIL;
 583 }
 584
 585 int rndis_filter_receive(struct net_device *ndev,
 586                          struct netvsc_device *net_dev,
 587                          struct netvsc_channel *nvchan,
 588                          void *data, u32 buflen)
 589 {
 590         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 591         struct rndis_message *rndis_msg = nvchan->recv_buf;
 592
 593         if (buflen < RNDIS_HEADER_SIZE) {
 594                 netdev_err(ndev, "Invalid rndis_msg (buflen: %u)\n", buflen);
 595                 return NVSP_STAT_FAIL;
 596         }
 597
 598         /* Copy the RNDIS msg header into nvchan->recv_buf */
 599         memcpy(rndis_msg, data, RNDIS_HEADER_SIZE);
 600
 601         /* Validate incoming rndis_message packet */
 602         if (rndis_msg->msg_len < RNDIS_HEADER_SIZE ||
 603             buflen < rndis_msg->msg_len) {
 604                 netdev_err(ndev, "Invalid rndis_msg (buflen: %u, msg_len: %u)\n",
 605                            buflen, rndis_msg->msg_len);
 606                 return NVSP_STAT_FAIL;
 607         }
 608
 609         if (netif_msg_rx_status(net_device_ctx))
 610                 dump_rndis_message(ndev, rndis_msg, data);
 611
 612         switch (rndis_msg->ndis_msg_type) {
 613         case RNDIS_MSG_PACKET:
 614                 return rndis_filter_receive_data(ndev, net_dev, nvchan,
 615                                                  rndis_msg, data, buflen);
 616         case RNDIS_MSG_INIT_C:
 617         case RNDIS_MSG_QUERY_C:
 618         case RNDIS_MSG_SET_C:
 619                 /* completion msgs */
 620                 rndis_filter_receive_response(ndev, net_dev, rndis_msg, data);
 621                 break;
 622
 623         case RNDIS_MSG_INDICATE:
 624                 /* notification msgs */
 625                 netvsc_linkstatus_callback(ndev, rndis_msg, data, buflen);
 626                 break;
 627         default:
 628                 netdev_err(ndev,
 629                         "unhandled rndis message (type %u len %u)\n",
 630                            rndis_msg->ndis_msg_type,
 631                            rndis_msg->msg_len);
 632                 return NVSP_STAT_FAIL;
 633         }
 634
 635         return NVSP_STAT_SUCCESS;
 636 }
 637
 638 static int rndis_filter_query_device(struct rndis_device *dev,
 639                                      struct netvsc_device *nvdev,
 640                                      u32 oid, void *result, u32 *result_size)
 641 {
 642         struct rndis_request *request;
 643         u32 inresult_size = *result_size;
 644         struct rndis_query_request *query;
 645         struct rndis_query_complete *query_complete;
 646         u32 msg_len;
 647         int ret = 0;
 648
 649         if (!result)
 650                 return -EINVAL;
 651
 652         *result_size = 0;
 653         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 654                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 655         if (!request) {
 656                 ret = -ENOMEM;
 657                 goto cleanup;
 658         }
 659
 660         /* Setup the rndis query */
 661         query = &request->request_msg.msg.query_req;
 662         query->oid = oid;
 663         query->info_buf_offset = sizeof(struct rndis_query_request);
 664         query->info_buflen = 0;
 665         query->dev_vc_handle = 0;
 666
 667         if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
 668                 struct ndis_offload *hwcaps;
 669                 u32 nvsp_version = nvdev->nvsp_version;
 670                 u8 ndis_rev;
 671                 size_t size;
 672
 673                 if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
 674                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 675                         size = NDIS_OFFLOAD_SIZE;
 676                 } else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
 677                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
 678                         size = NDIS_OFFLOAD_SIZE_6_1;
 679                 } else {
 680                         ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
 681                         size = NDIS_OFFLOAD_SIZE_6_0;
 682                 }
 683
 684                 request->request_msg.msg_len += size;
 685                 query->info_buflen = size;
 686                 hwcaps = (struct ndis_offload *)
 687                         ((unsigned long)query + query->info_buf_offset);
 688
 689                 hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
 690                 hwcaps->header.revision = ndis_rev;
 691                 hwcaps->header.size = size;
 692
 693         } else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
 694                 struct ndis_recv_scale_cap *cap;
 695
 696                 request->request_msg.msg_len +=
 697                         sizeof(struct ndis_recv_scale_cap);
 698                 query->info_buflen = sizeof(struct ndis_recv_scale_cap);
 699                 cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
 700                                                      query->info_buf_offset);
 701                 cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
 702                 cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
 703                 cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
 704         }
 705
 706         ret = rndis_filter_send_request(dev, request);
 707         if (ret != 0)
 708                 goto cleanup;
 709
 710         wait_for_completion(&request->wait_event);
 711
 712         /* Copy the response back */
 713         query_complete = &request->response_msg.msg.query_complete;
 714         msg_len = request->response_msg.msg_len;
 715
 716         /* Ensure the packet is big enough to access its fields */
 717         if (msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_query_complete)) {
 718                 ret = -1;
 719                 goto cleanup;
 720         }
 721
 722         if (query_complete->info_buflen > inresult_size ||
 723             query_complete->info_buf_offset < sizeof(*query_complete) ||
 724             msg_len - RNDIS_HEADER_SIZE < query_complete->info_buf_offset ||
 725             msg_len - RNDIS_HEADER_SIZE - query_complete->info_buf_offset
 726                         < query_complete->info_buflen) {
 727                 ret = -1;
 728                 goto cleanup;
 729         }
 730
 731         memcpy(result,
 732                (void *)((unsigned long)query_complete +
 733                          query_complete->info_buf_offset),
 734                query_complete->info_buflen);
 735
 736         *result_size = query_complete->info_buflen;
 737
 738 cleanup:
 739         if (request)
 740                 put_rndis_request(dev, request);
 741
 742         return ret;
 743 }
 744
 745 /* Get the hardware offload capabilities */
 746 static int
 747 rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
 748                    struct ndis_offload *caps)
 749 {
 750         u32 caps_len = sizeof(*caps);
 751         int ret;
 752
 753         memset(caps, 0, sizeof(*caps));
 754
 755         ret = rndis_filter_query_device(dev, net_device,
 756                                         OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
 757                                         caps, &caps_len);
 758         if (ret)
 759                 return ret;
 760
 761         if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
 762                 netdev_warn(dev->ndev, "invalid NDIS objtype %#x\n",
 763                             caps->header.type);
 764                 return -EINVAL;
 765         }
 766
 767         if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
 768                 netdev_warn(dev->ndev, "invalid NDIS objrev %x\n",
 769                             caps->header.revision);
 770                 return -EINVAL;
 771         }
 772
 773         if (caps->header.size > caps_len ||
 774             caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
 775                 netdev_warn(dev->ndev,
 776                             "invalid NDIS objsize %u, data size %u\n",
 777                             caps->header.size, caps_len);
 778                 return -EINVAL;
 779         }
 780
 781         return 0;
 782 }
 783
 784 static int rndis_filter_query_device_mac(struct rndis_device *dev,
 785                                          struct netvsc_device *net_device)
 786 {
 787         u32 size = ETH_ALEN;
 788
 789         return rndis_filter_query_device(dev, net_device,
 790                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 791                                       dev->hw_mac_adr, &size);
 792 }
 793
 794 #define NWADR_STR "NetworkAddress"
 795 #define NWADR_STRLEN 14
 796
 797 int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
 798                                 const char *mac)
 799 {
 800         struct rndis_device *rdev = nvdev->extension;
 801         struct rndis_request *request;
 802         struct rndis_set_request *set;
 803         struct rndis_config_parameter_info *cpi;
 804         wchar_t *cfg_nwadr, *cfg_mac;
 805         struct rndis_set_complete *set_complete;
 806         char macstr[2*ETH_ALEN+1];
 807         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 808                 2*NWADR_STRLEN + 4*ETH_ALEN;
 809         int ret;
 810
 811         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 812                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 813         if (!request)
 814                 return -ENOMEM;
 815
 816         set = &request->request_msg.msg.set_req;
 817         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 818         set->info_buflen = extlen;
 819         set->info_buf_offset = sizeof(struct rndis_set_request);
 820         set->dev_vc_handle = 0;
 821
 822         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 823                 set->info_buf_offset);
 824         cpi->parameter_name_offset =
 825                 sizeof(struct rndis_config_parameter_info);
 826         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 827         cpi->parameter_name_length = 2*NWADR_STRLEN;
 828         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 829         cpi->parameter_value_offset =
 830                 cpi->parameter_name_offset + cpi->parameter_name_length;
 831         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 832         cpi->parameter_value_length = 4*ETH_ALEN;
 833
 834         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 835         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 836         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 837                               cfg_nwadr, NWADR_STRLEN);
 838         if (ret < 0)
 839                 goto cleanup;
 840         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 841         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 842                               cfg_mac, 2*ETH_ALEN);
 843         if (ret < 0)
 844                 goto cleanup;
 845
 846         ret = rndis_filter_send_request(rdev, request);
 847         if (ret != 0)
 848                 goto cleanup;
 849
 850         wait_for_completion(&request->wait_event);
 851
 852         set_complete = &request->response_msg.msg.set_complete;
 853         if (set_complete->status != RNDIS_STATUS_SUCCESS)
 854                 ret = -EIO;
 855
 856 cleanup:
 857         put_rndis_request(rdev, request);
 858         return ret;
 859 }
 860
 861 int
 862 rndis_filter_set_offload_params(struct net_device *ndev,
 863                                 struct netvsc_device *nvdev,
 864                                 struct ndis_offload_params *req_offloads)
 865 {
 866         struct rndis_device *rdev = nvdev->extension;
 867         struct rndis_request *request;
 868         struct rndis_set_request *set;
 869         struct ndis_offload_params *offload_params;
 870         struct rndis_set_complete *set_complete;
 871         u32 extlen = sizeof(struct ndis_offload_params);
 872         int ret;
 873         u32 vsp_version = nvdev->nvsp_version;
 874
 875         if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
 876                 extlen = VERSION_4_OFFLOAD_SIZE;
 877                 /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
 878                  * UDP checksum offload.
 879                  */
 880                 req_offloads->udp_ip_v4_csum = 0;
 881                 req_offloads->udp_ip_v6_csum = 0;
 882         }
 883
 884         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 885                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 886         if (!request)
 887                 return -ENOMEM;
 888
 889         set = &request->request_msg.msg.set_req;
 890         set->oid = OID_TCP_OFFLOAD_PARAMETERS;
 891         set->info_buflen = extlen;
 892         set->info_buf_offset = sizeof(struct rndis_set_request);
 893         set->dev_vc_handle = 0;
 894
 895         offload_params = (struct ndis_offload_params *)((ulong)set +
 896                                 set->info_buf_offset);
 897         *offload_params = *req_offloads;
 898         offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
 899         offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
 900         offload_params->header.size = extlen;
 901
 902         ret = rndis_filter_send_request(rdev, request);
 903         if (ret != 0)
 904                 goto cleanup;
 905
 906         wait_for_completion(&request->wait_event);
 907         set_complete = &request->response_msg.msg.set_complete;
 908         if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 909                 netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
 910                            set_complete->status);
 911                 ret = -EINVAL;
 912         }
 913
 914 cleanup:
 915         put_rndis_request(rdev, request);
 916         return ret;
 917 }
 918
 919 static int rndis_set_rss_param_msg(struct rndis_device *rdev,
 920                                    const u8 *rss_key, u16 flag)
 921 {
 922         struct net_device *ndev = rdev->ndev;
 923         struct net_device_context *ndc = netdev_priv(ndev);
 924         struct rndis_request *request;
 925         struct rndis_set_request *set;
 926         struct rndis_set_complete *set_complete;
 927         u32 extlen = sizeof(struct ndis_recv_scale_param) +
 928                      4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
 929         struct ndis_recv_scale_param *rssp;
 930         u32 *itab;
 931         u8 *keyp;
 932         int i, ret;
 933
 934         request = get_rndis_request(
 935                         rdev, RNDIS_MSG_SET,
 936                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 937         if (!request)
 938                 return -ENOMEM;
 939
 940         set = &request->request_msg.msg.set_req;
 941         set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
 942         set->info_buflen = extlen;
 943         set->info_buf_offset = sizeof(struct rndis_set_request);
 944         set->dev_vc_handle = 0;
 945
 946         rssp = (struct ndis_recv_scale_param *)(set + 1);
 947         rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
 948         rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
 949         rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
 950         rssp->flag = flag;
 951         rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
 952                          NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
 953                          NDIS_HASH_TCP_IPV6;
 954         rssp->indirect_tabsize = 4*ITAB_NUM;
 955         rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
 956         rssp->hashkey_size = NETVSC_HASH_KEYLEN;
 957         rssp->hashkey_offset = rssp->indirect_taboffset +
 958                                rssp->indirect_tabsize;
 959
 960         /* Set indirection table entries */
 961         itab = (u32 *)(rssp + 1);
 962         for (i = 0; i < ITAB_NUM; i++)
 963                 itab[i] = ndc->rx_table[i];
 964
 965         /* Set hask key values */
 966         keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
 967         memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
 968
 969         ret = rndis_filter_send_request(rdev, request);
 970         if (ret != 0)
 971                 goto cleanup;
 972
 973         wait_for_completion(&request->wait_event);
 974         set_complete = &request->response_msg.msg.set_complete;
 975         if (set_complete->status == RNDIS_STATUS_SUCCESS) {
 976                 if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
 977                     !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
 978                         memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
 979
 980         } else {
 981                 netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
 982                            set_complete->status);
 983                 ret = -EINVAL;
 984         }
 985
 986 cleanup:
 987         put_rndis_request(rdev, request);
 988         return ret;
 989 }
 990
 991 int rndis_filter_set_rss_param(struct rndis_device *rdev,
 992                                const u8 *rss_key)
 993 {
 994         /* Disable RSS before change */
 995         rndis_set_rss_param_msg(rdev, rss_key,
 996                                 NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
 997
 998         return rndis_set_rss_param_msg(rdev, rss_key, 0);
 999 }
1000
1001 static int rndis_filter_query_device_link_status(struct rndis_device *dev,
1002                                                  struct netvsc_device *net_device)
1003 {
1004         u32 size = sizeof(u32);
1005         u32 link_status;
1006
1007         return rndis_filter_query_device(dev, net_device,
1008                                          RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
1009                                          &link_status, &size);
1010 }
1011
1012 static int rndis_filter_query_link_speed(struct rndis_device *dev,
1013                                          struct netvsc_device *net_device)
1014 {
1015         u32 size = sizeof(u32);
1016         u32 link_speed;
1017         struct net_device_context *ndc;
1018         int ret;
1019
1020         ret = rndis_filter_query_device(dev, net_device,
1021                                         RNDIS_OID_GEN_LINK_SPEED,
1022                                         &link_speed, &size);
1023
1024         if (!ret) {
1025                 ndc = netdev_priv(dev->ndev);
1026
1027                 /* The link speed reported from host is in 100bps unit, so
1028                  * we convert it to Mbps here.
1029                  */
1030                 ndc->speed = link_speed / 10000;
1031         }
1032
1033         return ret;
1034 }
1035
1036 static int rndis_filter_set_packet_filter(struct rndis_device *dev,
1037                                           u32 new_filter)
1038 {
1039         struct rndis_request *request;
1040         struct rndis_set_request *set;
1041         int ret;
1042
1043         if (dev->filter == new_filter)
1044                 return 0;
1045
1046         request = get_rndis_request(dev, RNDIS_MSG_SET,
1047                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
1048                         sizeof(u32));
1049         if (!request)
1050                 return -ENOMEM;
1051
1052         /* Setup the rndis set */
1053         set = &request->request_msg.msg.set_req;
1054         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
1055         set->info_buflen = sizeof(u32);
1056         set->info_buf_offset = offsetof(typeof(*set), info_buf);
1057         memcpy(set->info_buf, &new_filter, sizeof(u32));
1058
1059         ret = rndis_filter_send_request(dev, request);
1060         if (ret == 0) {
1061                 wait_for_completion(&request->wait_event);
1062                 dev->filter = new_filter;
1063         }
1064
1065         put_rndis_request(dev, request);
1066
1067         return ret;
1068 }
1069
1070 static void rndis_set_multicast(struct work_struct *w)
1071 {
1072         struct rndis_device *rdev
1073                 = container_of(w, struct rndis_device, mcast_work);
1074         u32 filter = NDIS_PACKET_TYPE_DIRECTED;
1075         unsigned int flags = rdev->ndev->flags;
1076
1077         if (flags & IFF_PROMISC) {
1078                 filter = NDIS_PACKET_TYPE_PROMISCUOUS;
1079         } else {
1080                 if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
1081                         filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
1082                 if (flags & IFF_BROADCAST)
1083                         filter |= NDIS_PACKET_TYPE_BROADCAST;
1084         }
1085
1086         rndis_filter_set_packet_filter(rdev, filter);
1087 }
1088
1089 void rndis_filter_update(struct netvsc_device *nvdev)
1090 {
1091         struct rndis_device *rdev = nvdev->extension;
1092
1093         schedule_work(&rdev->mcast_work);
1094 }
1095
1096 static int rndis_filter_init_device(struct rndis_device *dev,
1097                                     struct netvsc_device *nvdev)
1098 {
1099         struct rndis_request *request;
1100         struct rndis_initialize_request *init;
1101         struct rndis_initialize_complete *init_complete;
1102         u32 status;
1103         int ret;
1104
1105         request = get_rndis_request(dev, RNDIS_MSG_INIT,
1106                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
1107         if (!request) {
1108                 ret = -ENOMEM;
1109                 goto cleanup;
1110         }
1111
1112         /* Setup the rndis set */
1113         init = &request->request_msg.msg.init_req;
1114         init->major_ver = RNDIS_MAJOR_VERSION;
1115         init->minor_ver = RNDIS_MINOR_VERSION;
1116         init->max_xfer_size = 0x4000;
1117
1118         dev->state = RNDIS_DEV_INITIALIZING;
1119
1120         ret = rndis_filter_send_request(dev, request);
1121         if (ret != 0) {
1122                 dev->state = RNDIS_DEV_UNINITIALIZED;
1123                 goto cleanup;
1124         }
1125
1126         wait_for_completion(&request->wait_event);
1127
1128         init_complete = &request->response_msg.msg.init_complete;
1129         status = init_complete->status;
1130         if (status == RNDIS_STATUS_SUCCESS) {
1131                 dev->state = RNDIS_DEV_INITIALIZED;
1132                 nvdev->max_pkt = init_complete->max_pkt_per_msg;
1133                 nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
1134                 ret = 0;
1135         } else {
1136                 dev->state = RNDIS_DEV_UNINITIALIZED;
1137                 ret = -EINVAL;
1138         }
1139
1140 cleanup:
1141         if (request)
1142                 put_rndis_request(dev, request);
1143
1144         return ret;
1145 }
1146
1147 static bool netvsc_device_idle(const struct netvsc_device *nvdev)
1148 {
1149         int i;
1150
1151         for (i = 0; i < nvdev->num_chn; i++) {
1152                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1153
1154                 if (nvchan->mrc.first != nvchan->mrc.next)
1155                         return false;
1156
1157                 if (atomic_read(&nvchan->queue_sends) > 0)
1158                         return false;
1159         }
1160
1161         return true;
1162 }
1163
1164 static void rndis_filter_halt_device(struct netvsc_device *nvdev,
1165                                      struct rndis_device *dev)
1166 {
1167         struct rndis_request *request;
1168         struct rndis_halt_request *halt;
1169
1170         /* Attempt to do a rndis device halt */
1171         request = get_rndis_request(dev, RNDIS_MSG_HALT,
1172                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
1173         if (!request)
1174                 goto cleanup;
1175
1176         /* Setup the rndis set */
1177         halt = &request->request_msg.msg.halt_req;
1178         halt->req_id = atomic_inc_return(&dev->new_req_id);
1179
1180         /* Ignore return since this msg is optional. */
1181         rndis_filter_send_request(dev, request);
1182
1183         dev->state = RNDIS_DEV_UNINITIALIZED;
1184
1185 cleanup:
1186         nvdev->destroy = true;
1187
1188         /* Force flag to be ordered before waiting */
1189         wmb();
1190
1191         /* Wait for all send completions */
1192         wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
1193
1194         if (request)
1195                 put_rndis_request(dev, request);
1196 }
1197
1198 static int rndis_filter_open_device(struct rndis_device *dev)
1199 {
1200         int ret;
1201
1202         if (dev->state != RNDIS_DEV_INITIALIZED)
1203                 return 0;
1204
1205         ret = rndis_filter_set_packet_filter(dev,
1206                                          NDIS_PACKET_TYPE_BROADCAST |
1207                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
1208                                          NDIS_PACKET_TYPE_DIRECTED);
1209         if (ret == 0)
1210                 dev->state = RNDIS_DEV_DATAINITIALIZED;
1211
1212         return ret;
1213 }
1214
1215 static int rndis_filter_close_device(struct rndis_device *dev)
1216 {
1217         int ret;
1218
1219         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1220                 return 0;
1221
1222         /* Make sure rndis_set_multicast doesn't re-enable filter! */
1223         cancel_work_sync(&dev->mcast_work);
1224
1225         ret = rndis_filter_set_packet_filter(dev, 0);
1226         if (ret == -ENODEV)
1227                 ret = 0;
1228
1229         if (ret == 0)
1230                 dev->state = RNDIS_DEV_INITIALIZED;
1231
1232         return ret;
1233 }
1234
1235 static void netvsc_sc_open(struct vmbus_channel *new_sc)
1236 {
1237         struct net_device *ndev =
1238                 hv_get_drvdata(new_sc->primary_channel->device_obj);
1239         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1240         struct netvsc_device *nvscdev;
1241         u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1242         struct netvsc_channel *nvchan;
1243         int ret;
1244
1245         /* This is safe because this callback only happens when
1246          * new device is being setup and waiting on the channel_init_wait.
1247          */
1248         nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1249         if (!nvscdev || chn_index >= nvscdev->num_chn)
1250                 return;
1251
1252         nvchan = nvscdev->chan_table + chn_index;
1253
1254         /* Because the device uses NAPI, all the interrupt batching and
1255          * control is done via Net softirq, not the channel handling
1256          */
1257         set_channel_read_mode(new_sc, HV_CALL_ISR);
1258
1259         /* Set the channel before opening.*/
1260         nvchan->channel = new_sc;
1261
1262         new_sc->next_request_id_callback = vmbus_next_request_id;
1263         new_sc->request_addr_callback = vmbus_request_addr;
1264         new_sc->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
1265         new_sc->max_pkt_size = NETVSC_MAX_PKT_SIZE;
1266
1267         ret = vmbus_open(new_sc, netvsc_ring_bytes,
1268                          netvsc_ring_bytes, NULL, 0,
1269                          netvsc_channel_cb, nvchan);
1270         if (ret == 0)
1271                 napi_enable(&nvchan->napi);
1272         else
1273                 netdev_notice(ndev, "sub channel open failed: %d\n", ret);
1274
1275         if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
1276                 wake_up(&nvscdev->subchan_open);
1277 }
1278
1279 /* Open sub-channels after completing the handling of the device probe.
1280  * This breaks overlap of processing the host message for the
1281  * new primary channel with the initialization of sub-channels.
1282  */
1283 int rndis_set_subchannel(struct net_device *ndev,
1284                          struct netvsc_device *nvdev,
1285                          struct netvsc_device_info *dev_info)
1286 {
1287         struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1288         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1289         struct hv_device *hv_dev = ndev_ctx->device_ctx;
1290         struct rndis_device *rdev = nvdev->extension;
1291         int i, ret;
1292
1293         ASSERT_RTNL();
1294
1295         memset(init_packet, 0, sizeof(struct nvsp_message));
1296         init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1297         init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1298         init_packet->msg.v5_msg.subchn_req.num_subchannels =
1299                                                 nvdev->num_chn - 1;
1300         trace_nvsp_send(ndev, init_packet);
1301
1302         ret = vmbus_sendpacket(hv_dev->channel, init_packet,
1303                                sizeof(struct nvsp_message),
1304                                (unsigned long)init_packet,
1305                                VM_PKT_DATA_INBAND,
1306                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1307         if (ret) {
1308                 netdev_err(ndev, "sub channel allocate send failed: %d\n", ret);
1309                 return ret;
1310         }
1311
1312         wait_for_completion(&nvdev->channel_init_wait);
1313         if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1314                 netdev_err(ndev, "sub channel request failed\n");
1315                 return -EIO;
1316         }
1317
1318         /* Check that number of allocated sub channel is within the expected range */
1319         if (init_packet->msg.v5_msg.subchn_comp.num_subchannels > nvdev->num_chn - 1) {
1320                 netdev_err(ndev, "invalid number of allocated sub channel\n");
1321                 return -EINVAL;
1322         }
1323         nvdev->num_chn = 1 +
1324                 init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1325
1326         /* wait for all sub channels to open */
1327         wait_event(nvdev->subchan_open,
1328                    atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1329
1330         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1331                 ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1332
1333         /* ignore failures from setting rss parameters, still have channels */
1334         if (dev_info)
1335                 rndis_filter_set_rss_param(rdev, dev_info->rss_key);
1336         else
1337                 rndis_filter_set_rss_param(rdev, netvsc_hash_key);
1338
1339         netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
1340         netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
1341
1342         return 0;
1343 }
1344
1345 static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1346                                    struct netvsc_device *nvdev)
1347 {
1348         struct net_device *net = rndis_device->ndev;
1349         struct net_device_context *net_device_ctx = netdev_priv(net);
1350         struct ndis_offload hwcaps;
1351         struct ndis_offload_params offloads;
1352         unsigned int gso_max_size = GSO_LEGACY_MAX_SIZE;
1353         int ret;
1354
1355         /* Find HW offload capabilities */
1356         ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
1357         if (ret != 0)
1358                 return ret;
1359
1360         /* A value of zero means "no change"; now turn on what we want. */
1361         memset(&offloads, 0, sizeof(struct ndis_offload_params));
1362
1363         /* Linux does not care about IP checksum, always does in kernel */
1364         offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1365
1366         /* Reset previously set hw_features flags */
1367         net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1368         net_device_ctx->tx_checksum_mask = 0;
1369
1370         /* Compute tx offload settings based on hw capabilities */
1371         net->hw_features |= NETIF_F_RXCSUM;
1372         net->hw_features |= NETIF_F_SG;
1373         net->hw_features |= NETIF_F_RXHASH;
1374
1375         if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1376                 /* Can checksum TCP */
1377                 net->hw_features |= NETIF_F_IP_CSUM;
1378                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1379
1380                 offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1381
1382                 if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1383                         offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1384                         net->hw_features |= NETIF_F_TSO;
1385
1386                         if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
1387                                 gso_max_size = hwcaps.lsov2.ip4_maxsz;
1388                 }
1389
1390                 if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1391                         offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1392                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1393                 }
1394         }
1395
1396         if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1397                 net->hw_features |= NETIF_F_IPV6_CSUM;
1398
1399                 offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1400                 net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1401
1402                 if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1403                     (hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1404                         offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1405                         net->hw_features |= NETIF_F_TSO6;
1406
1407                         if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
1408                                 gso_max_size = hwcaps.lsov2.ip6_maxsz;
1409                 }
1410
1411                 if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1412                         offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1413                         net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1414                 }
1415         }
1416
1417         if (hwcaps.rsc.ip4 && hwcaps.rsc.ip6) {
1418                 net->hw_features |= NETIF_F_LRO;
1419
1420                 if (net->features & NETIF_F_LRO) {
1421                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1422                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1423                 } else {
1424                         offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1425                         offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1426                 }
1427         }
1428
1429         /* In case some hw_features disappeared we need to remove them from
1430          * net->features list as they're no longer supported.
1431          */
1432         net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1433
1434         netif_set_tso_max_size(net, gso_max_size);
1435
1436         ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
1437
1438         return ret;
1439 }
1440
1441 static void rndis_get_friendly_name(struct net_device *net,
1442                                     struct rndis_device *rndis_device,
1443                                     struct netvsc_device *net_device)
1444 {
1445         ucs2_char_t wname[256];
1446         unsigned long len;
1447         u8 ifalias[256];
1448         u32 size;
1449
1450         size = sizeof(wname);
1451         if (rndis_filter_query_device(rndis_device, net_device,
1452                                       RNDIS_OID_GEN_FRIENDLY_NAME,
1453                                       wname, &size) != 0)
1454                 return; /* ignore if host does not support */
1455
1456         if (size == 0)
1457                 return; /* name not set */
1458
1459         /* Convert Windows Unicode string to UTF-8 */
1460         len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));
1461
1462         /* ignore the default value from host */
1463         if (strcmp(ifalias, "Network Adapter") != 0)
1464                 dev_set_alias(net, ifalias, len);
1465 }
1466
1467 struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1468                                       struct netvsc_device_info *device_info)
1469 {
1470         struct net_device *net = hv_get_drvdata(dev);
1471         struct net_device_context *ndc = netdev_priv(net);
1472         struct netvsc_device *net_device;
1473         struct rndis_device *rndis_device;
1474         struct ndis_recv_scale_cap rsscap;
1475         u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1476         u32 mtu, size;
1477         u32 num_possible_rss_qs;
1478         int i, ret;
1479
1480         rndis_device = get_rndis_device();
1481         if (!rndis_device)
1482                 return ERR_PTR(-ENODEV);
1483
1484         /* Let the inner driver handle this first to create the netvsc channel
1485          * NOTE! Once the channel is created, we may get a receive callback
1486          * (RndisFilterOnReceive()) before this call is completed
1487          */
1488         net_device = netvsc_device_add(dev, device_info);
1489         if (IS_ERR(net_device)) {
1490                 kfree(rndis_device);
1491                 return net_device;
1492         }
1493
1494         /* Initialize the rndis device */
1495         net_device->max_chn = 1;
1496         net_device->num_chn = 1;
1497
1498         net_device->extension = rndis_device;
1499         rndis_device->ndev = net;
1500
1501         /* Send the rndis initialization message */
1502         ret = rndis_filter_init_device(rndis_device, net_device);
1503         if (ret != 0)
1504                 goto err_dev_remv;
1505
1506         /* Get the MTU from the host */
1507         size = sizeof(u32);
1508         ret = rndis_filter_query_device(rndis_device, net_device,
1509                                         RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1510                                         &mtu, &size);
1511         if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1512                 net->mtu = mtu;
1513
1514         /* Get the mac address */
1515         ret = rndis_filter_query_device_mac(rndis_device, net_device);
1516         if (ret != 0)
1517                 goto err_dev_remv;
1518
1519         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1520
1521         /* Get friendly name as ifalias*/
1522         if (!net->ifalias)
1523                 rndis_get_friendly_name(net, rndis_device, net_device);
1524
1525         /* Query and set hardware capabilities */
1526         ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
1527         if (ret != 0)
1528                 goto err_dev_remv;
1529
1530         rndis_filter_query_device_link_status(rndis_device, net_device);
1531
1532         netdev_dbg(net, "Device MAC %pM link state %s\n",
1533                    rndis_device->hw_mac_adr,
1534                    rndis_device->link_state ? "down" : "up");
1535
1536         if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1537                 goto out;
1538
1539         rndis_filter_query_link_speed(rndis_device, net_device);
1540
1541         /* vRSS setup */
1542         memset(&rsscap, 0, rsscap_size);
1543         ret = rndis_filter_query_device(rndis_device, net_device,
1544                                         OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1545                                         &rsscap, &rsscap_size);
1546         if (ret || rsscap.num_recv_que < 2)
1547                 goto out;
1548
1549         /* This guarantees that num_possible_rss_qs <= num_online_cpus */
1550         num_possible_rss_qs = min_t(u32, num_online_cpus(),
1551                                     rsscap.num_recv_que);
1552
1553         net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1554
1555         /* We will use the given number of channels if available. */
1556         net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1557
1558         if (!netif_is_rxfh_configured(net)) {
1559                 for (i = 0; i < ITAB_NUM; i++)
1560                         ndc->rx_table[i] = ethtool_rxfh_indir_default(
1561                                                 i, net_device->num_chn);
1562         }
1563
1564         atomic_set(&net_device->open_chn, 1);
1565         vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);
1566
1567         for (i = 1; i < net_device->num_chn; i++) {
1568                 ret = netvsc_alloc_recv_comp_ring(net_device, i);
1569                 if (ret) {
1570                         while (--i != 0)
1571                                 vfree(net_device->chan_table[i].mrc.slots);
1572                         goto out;
1573                 }
1574         }
1575
1576         for (i = 1; i < net_device->num_chn; i++)
1577                 netif_napi_add(net, &net_device->chan_table[i].napi,
1578                                netvsc_poll, NAPI_POLL_WEIGHT);
1579
1580         return net_device;
1581
1582 out:
1583         /* setting up multiple channels failed */
1584         net_device->max_chn = 1;
1585         net_device->num_chn = 1;
1586         return net_device;
1587
1588 err_dev_remv:
1589         rndis_filter_device_remove(dev, net_device);
1590         return ERR_PTR(ret);
1591 }
1592
1593 void rndis_filter_device_remove(struct hv_device *dev,
1594                                 struct netvsc_device *net_dev)
1595 {
1596         struct rndis_device *rndis_dev = net_dev->extension;
1597
1598         /* Halt and release the rndis device */
1599         rndis_filter_halt_device(net_dev, rndis_dev);
1600
1601         netvsc_device_remove(dev);
1602 }
1603
1604 int rndis_filter_open(struct netvsc_device *nvdev)
1605 {
1606         if (!nvdev)
1607                 return -EINVAL;
1608
1609         return rndis_filter_open_device(nvdev->extension);
1610 }
1611
1612 int rndis_filter_close(struct netvsc_device *nvdev)
1613 {
1614         if (!nvdev)
1615                 return -EINVAL;
1616
1617         return rndis_filter_close_device(nvdev->extension);
1618 }