Bootlin logo

Elixir Cross Referencer

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
/*
 * Copyright (c) 2009, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/nls.h>

#include "hyperv_net.h"


#define RNDIS_EXT_LEN PAGE_SIZE
struct rndis_request {
	struct list_head list_ent;
	struct completion  wait_event;

	struct rndis_message response_msg;
	/*
	 * The buffer for extended info after the RNDIS response message. It's
	 * referenced based on the data offset in the RNDIS message. Its size
	 * is enough for current needs, and should be sufficient for the near
	 * future.
	 */
	u8 response_ext[RNDIS_EXT_LEN];

	/* Simplify allocation by having a netvsc packet inline */
	struct hv_netvsc_packet	pkt;

	struct rndis_message request_msg;
	/*
	 * The buffer for the extended info after the RNDIS request message.
	 * It is referenced and sized in a similar way as response_ext.
	 */
	u8 request_ext[RNDIS_EXT_LEN];
};

static struct rndis_device *get_rndis_device(void)
{
	struct rndis_device *device;

	device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
	if (!device)
		return NULL;

	spin_lock_init(&device->request_lock);

	INIT_LIST_HEAD(&device->req_list);

	device->state = RNDIS_DEV_UNINITIALIZED;

	return device;
}

static struct rndis_request *get_rndis_request(struct rndis_device *dev,
					     u32 msg_type,
					     u32 msg_len)
{
	struct rndis_request *request;
	struct rndis_message *rndis_msg;
	struct rndis_set_request *set;
	unsigned long flags;

	request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
	if (!request)
		return NULL;

	init_completion(&request->wait_event);

	rndis_msg = &request->request_msg;
	rndis_msg->ndis_msg_type = msg_type;
	rndis_msg->msg_len = msg_len;

	request->pkt.q_idx = 0;

	/*
	 * Set the request id. This field is always after the rndis header for
	 * request/response packet types so we just used the SetRequest as a
	 * template
	 */
	set = &rndis_msg->msg.set_req;
	set->req_id = atomic_inc_return(&dev->new_req_id);

	/* Add to the request list */
	spin_lock_irqsave(&dev->request_lock, flags);
	list_add_tail(&request->list_ent, &dev->req_list);
	spin_unlock_irqrestore(&dev->request_lock, flags);

	return request;
}

static void put_rndis_request(struct rndis_device *dev,
			    struct rndis_request *req)
{
	unsigned long flags;

	spin_lock_irqsave(&dev->request_lock, flags);
	list_del(&req->list_ent);
	spin_unlock_irqrestore(&dev->request_lock, flags);

	kfree(req);
}

static void dump_rndis_message(struct hv_device *hv_dev,
			struct rndis_message *rndis_msg)
{
	struct net_device *netdev;
	struct netvsc_device *net_device;

	net_device = hv_get_drvdata(hv_dev);
	netdev = net_device->ndev;

	switch (rndis_msg->ndis_msg_type) {
	case RNDIS_MSG_PACKET:
		netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
			   "data offset %u data len %u, # oob %u, "
			   "oob offset %u, oob len %u, pkt offset %u, "
			   "pkt len %u\n",
			   rndis_msg->msg_len,
			   rndis_msg->msg.pkt.data_offset,
			   rndis_msg->msg.pkt.data_len,
			   rndis_msg->msg.pkt.num_oob_data_elements,
			   rndis_msg->msg.pkt.oob_data_offset,
			   rndis_msg->msg.pkt.oob_data_len,
			   rndis_msg->msg.pkt.per_pkt_info_offset,
			   rndis_msg->msg.pkt.per_pkt_info_len);
		break;

	case RNDIS_MSG_INIT_C:
		netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
			"(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
			"device flags %d, max xfer size 0x%x, max pkts %u, "
			"pkt aligned %u)\n",
			rndis_msg->msg_len,
			rndis_msg->msg.init_complete.req_id,
			rndis_msg->msg.init_complete.status,
			rndis_msg->msg.init_complete.major_ver,
			rndis_msg->msg.init_complete.minor_ver,
			rndis_msg->msg.init_complete.dev_flags,
			rndis_msg->msg.init_complete.max_xfer_size,
			rndis_msg->msg.init_complete.
			   max_pkt_per_msg,
			rndis_msg->msg.init_complete.
			   pkt_alignment_factor);
		break;

	case RNDIS_MSG_QUERY_C:
		netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
			"(len %u, id 0x%x, status 0x%x, buf len %u, "
			"buf offset %u)\n",
			rndis_msg->msg_len,
			rndis_msg->msg.query_complete.req_id,
			rndis_msg->msg.query_complete.status,
			rndis_msg->msg.query_complete.
			   info_buflen,
			rndis_msg->msg.query_complete.
			   info_buf_offset);
		break;

	case RNDIS_MSG_SET_C:
		netdev_dbg(netdev,
			"RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
			rndis_msg->msg_len,
			rndis_msg->msg.set_complete.req_id,
			rndis_msg->msg.set_complete.status);
		break;

	case RNDIS_MSG_INDICATE:
		netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
			"(len %u, status 0x%x, buf len %u, buf offset %u)\n",
			rndis_msg->msg_len,
			rndis_msg->msg.indicate_status.status,
			rndis_msg->msg.indicate_status.status_buflen,
			rndis_msg->msg.indicate_status.status_buf_offset);
		break;

	default:
		netdev_dbg(netdev, "0x%x (len %u)\n",
			rndis_msg->ndis_msg_type,
			rndis_msg->msg_len);
		break;
	}
}

static int rndis_filter_send_request(struct rndis_device *dev,
				  struct rndis_request *req)
{
	int ret;
	struct hv_netvsc_packet *packet;
	struct hv_page_buffer page_buf[2];

	/* Setup the packet to send it */
	packet = &req->pkt;

	packet->is_data_pkt = false;
	packet->total_data_buflen = req->request_msg.msg_len;
	packet->page_buf_cnt = 1;
	packet->page_buf = page_buf;

	packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
					PAGE_SHIFT;
	packet->page_buf[0].len = req->request_msg.msg_len;
	packet->page_buf[0].offset =
		(unsigned long)&req->request_msg & (PAGE_SIZE - 1);

	/* Add one page_buf when request_msg crossing page boundary */
	if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) {
		packet->page_buf_cnt++;
		packet->page_buf[0].len = PAGE_SIZE -
			packet->page_buf[0].offset;
		packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg
			+ packet->page_buf[0].len) >> PAGE_SHIFT;
		packet->page_buf[1].offset = 0;
		packet->page_buf[1].len = req->request_msg.msg_len -
			packet->page_buf[0].len;
	}

	packet->send_completion = NULL;
	packet->xmit_more = false;

	ret = netvsc_send(dev->net_dev->dev, packet);
	return ret;
}

static void rndis_set_link_state(struct rndis_device *rdev,
				 struct rndis_request *request)
{
	u32 link_status;
	struct rndis_query_complete *query_complete;

	query_complete = &request->response_msg.msg.query_complete;

	if (query_complete->status == RNDIS_STATUS_SUCCESS &&
	    query_complete->info_buflen == sizeof(u32)) {
		memcpy(&link_status, (void *)((unsigned long)query_complete +
		       query_complete->info_buf_offset), sizeof(u32));
		rdev->link_state = link_status != 0;
	}
}

static void rndis_filter_receive_response(struct rndis_device *dev,
				       struct rndis_message *resp)
{
	struct rndis_request *request = NULL;
	bool found = false;
	unsigned long flags;
	struct net_device *ndev;

	ndev = dev->net_dev->ndev;

	spin_lock_irqsave(&dev->request_lock, flags);
	list_for_each_entry(request, &dev->req_list, list_ent) {
		/*
		 * All request/response message contains RequestId as the 1st
		 * field
		 */
		if (request->request_msg.msg.init_req.req_id
		    == resp->msg.init_complete.req_id) {
			found = true;
			break;
		}
	}
	spin_unlock_irqrestore(&dev->request_lock, flags);

	if (found) {
		if (resp->msg_len <=
		    sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
			memcpy(&request->response_msg, resp,
			       resp->msg_len);
			if (request->request_msg.ndis_msg_type ==
			    RNDIS_MSG_QUERY && request->request_msg.msg.
			    query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
				rndis_set_link_state(dev, request);
		} else {
			netdev_err(ndev,
				"rndis response buffer overflow "
				"detected (size %u max %zu)\n",
				resp->msg_len,
				sizeof(struct rndis_message));

			if (resp->ndis_msg_type ==
			    RNDIS_MSG_RESET_C) {
				/* does not have a request id field */
				request->response_msg.msg.reset_complete.
					status = RNDIS_STATUS_BUFFER_OVERFLOW;
			} else {
				request->response_msg.msg.
				init_complete.status =
					RNDIS_STATUS_BUFFER_OVERFLOW;
			}
		}

		complete(&request->wait_event);
	} else {
		netdev_err(ndev,
			"no rndis request found for this response "
			"(id 0x%x res type 0x%x)\n",
			resp->msg.init_complete.req_id,
			resp->ndis_msg_type);
	}
}

/*
 * Get the Per-Packet-Info with the specified type
 * return NULL if not found.
 */
static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
{
	struct rndis_per_packet_info *ppi;
	int len;

	if (rpkt->per_pkt_info_offset == 0)
		return NULL;

	ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
		rpkt->per_pkt_info_offset);
	len = rpkt->per_pkt_info_len;

	while (len > 0) {
		if (ppi->type == type)
			return (void *)((ulong)ppi + ppi->ppi_offset);
		len -= ppi->size;
		ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
	}

	return NULL;
}

static void rndis_filter_receive_data(struct rndis_device *dev,
				   struct rndis_message *msg,
				   struct hv_netvsc_packet *pkt)
{
	struct rndis_packet *rndis_pkt;
	u32 data_offset;
	struct ndis_pkt_8021q_info *vlan;
	struct ndis_tcp_ip_checksum_info *csum_info;

	rndis_pkt = &msg->msg.pkt;

	/* Remove the rndis header and pass it back up the stack */
	data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;

	pkt->total_data_buflen -= data_offset;

	/*
	 * Make sure we got a valid RNDIS message, now total_data_buflen
	 * should be the data packet size plus the trailer padding size
	 */
	if (pkt->total_data_buflen < rndis_pkt->data_len) {
		netdev_err(dev->net_dev->ndev, "rndis message buffer "
			   "overflow detected (got %u, min %u)"
			   "...dropping this message!\n",
			   pkt->total_data_buflen, rndis_pkt->data_len);
		return;
	}

	/*
	 * Remove the rndis trailer padding from rndis packet message
	 * rndis_pkt->data_len tell us the real data length, we only copy
	 * the data packet to the stack, without the rndis trailer padding
	 */
	pkt->total_data_buflen = rndis_pkt->data_len;
	pkt->data = (void *)((unsigned long)pkt->data + data_offset);

	vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
	if (vlan) {
		pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
			(vlan->pri << VLAN_PRIO_SHIFT);
	} else {
		pkt->vlan_tci = 0;
	}

	csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
	netvsc_recv_callback(dev->net_dev->dev, pkt, csum_info);
}

int rndis_filter_receive(struct hv_device *dev,
				struct hv_netvsc_packet	*pkt)
{
	struct netvsc_device *net_dev = hv_get_drvdata(dev);
	struct rndis_device *rndis_dev;
	struct rndis_message *rndis_msg;
	struct net_device *ndev;
	int ret = 0;

	if (!net_dev) {
		ret = -EINVAL;
		goto exit;
	}

	ndev = net_dev->ndev;

	/* Make sure the rndis device state is initialized */
	if (!net_dev->extension) {
		netdev_err(ndev, "got rndis message but no rndis device - "
			  "dropping this message!\n");
		ret = -ENODEV;
		goto exit;
	}

	rndis_dev = (struct rndis_device *)net_dev->extension;
	if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
		netdev_err(ndev, "got rndis message but rndis device "
			   "uninitialized...dropping this message!\n");
		ret = -ENODEV;
		goto exit;
	}

	rndis_msg = pkt->data;

	if (netif_msg_rx_err(net_dev->nd_ctx))
		dump_rndis_message(dev, rndis_msg);

	switch (rndis_msg->ndis_msg_type) {
	case RNDIS_MSG_PACKET:
		/* data msg */
		rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
		break;

	case RNDIS_MSG_INIT_C:
	case RNDIS_MSG_QUERY_C:
	case RNDIS_MSG_SET_C:
		/* completion msgs */
		rndis_filter_receive_response(rndis_dev, rndis_msg);
		break;

	case RNDIS_MSG_INDICATE:
		/* notification msgs */
		netvsc_linkstatus_callback(dev, rndis_msg);
		break;
	default:
		netdev_err(ndev,
			"unhandled rndis message (type %u len %u)\n",
			   rndis_msg->ndis_msg_type,
			   rndis_msg->msg_len);
		break;
	}

exit:
	if (ret != 0)
		pkt->status = NVSP_STAT_FAIL;

	return ret;
}

static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
				  void *result, u32 *result_size)
{
	struct rndis_request *request;
	u32 inresult_size = *result_size;
	struct rndis_query_request *query;
	struct rndis_query_complete *query_complete;
	int ret = 0;
	unsigned long t;

	if (!result)
		return -EINVAL;

	*result_size = 0;
	request = get_rndis_request(dev, RNDIS_MSG_QUERY,
			RNDIS_MESSAGE_SIZE(struct rndis_query_request));
	if (!request) {
		ret = -ENOMEM;
		goto cleanup;
	}

	/* Setup the rndis query */
	query = &request->request_msg.msg.query_req;
	query->oid = oid;
	query->info_buf_offset = sizeof(struct rndis_query_request);
	query->info_buflen = 0;
	query->dev_vc_handle = 0;

	if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
		struct ndis_recv_scale_cap *cap;

		request->request_msg.msg_len +=
			sizeof(struct ndis_recv_scale_cap);
		query->info_buflen = sizeof(struct ndis_recv_scale_cap);
		cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
						     query->info_buf_offset);
		cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
		cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
		cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
	}

	ret = rndis_filter_send_request(dev, request);
	if (ret != 0)
		goto cleanup;

	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
	if (t == 0) {
		ret = -ETIMEDOUT;
		goto cleanup;
	}

	/* Copy the response back */
	query_complete = &request->response_msg.msg.query_complete;

	if (query_complete->info_buflen > inresult_size) {
		ret = -1;
		goto cleanup;
	}

	memcpy(result,
	       (void *)((unsigned long)query_complete +
			 query_complete->info_buf_offset),
	       query_complete->info_buflen);

	*result_size = query_complete->info_buflen;

cleanup:
	if (request)
		put_rndis_request(dev, request);

	return ret;
}

static int rndis_filter_query_device_mac(struct rndis_device *dev)
{
	u32 size = ETH_ALEN;

	return rndis_filter_query_device(dev,
				      RNDIS_OID_802_3_PERMANENT_ADDRESS,
				      dev->hw_mac_adr, &size);
}

#define NWADR_STR "NetworkAddress"
#define NWADR_STRLEN 14

int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
{
	struct netvsc_device *nvdev = hv_get_drvdata(hdev);
	struct rndis_device *rdev = nvdev->extension;
	struct net_device *ndev = nvdev->ndev;
	struct rndis_request *request;
	struct rndis_set_request *set;
	struct rndis_config_parameter_info *cpi;
	wchar_t *cfg_nwadr, *cfg_mac;
	struct rndis_set_complete *set_complete;
	char macstr[2*ETH_ALEN+1];
	u32 extlen = sizeof(struct rndis_config_parameter_info) +
		2*NWADR_STRLEN + 4*ETH_ALEN;
	int ret;
	unsigned long t;

	request = get_rndis_request(rdev, RNDIS_MSG_SET,
		RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
	if (!request)
		return -ENOMEM;

	set = &request->request_msg.msg.set_req;
	set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
	set->info_buflen = extlen;
	set->info_buf_offset = sizeof(struct rndis_set_request);
	set->dev_vc_handle = 0;

	cpi = (struct rndis_config_parameter_info *)((ulong)set +
		set->info_buf_offset);
	cpi->parameter_name_offset =
		sizeof(struct rndis_config_parameter_info);
	/* Multiply by 2 because host needs 2 bytes (utf16) for each char */
	cpi->parameter_name_length = 2*NWADR_STRLEN;
	cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
	cpi->parameter_value_offset =
		cpi->parameter_name_offset + cpi->parameter_name_length;
	/* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
	cpi->parameter_value_length = 4*ETH_ALEN;

	cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
	cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
	ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
			      cfg_nwadr, NWADR_STRLEN);
	if (ret < 0)
		goto cleanup;
	snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
	ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
			      cfg_mac, 2*ETH_ALEN);
	if (ret < 0)
		goto cleanup;

	ret = rndis_filter_send_request(rdev, request);
	if (ret != 0)
		goto cleanup;

	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
	if (t == 0) {
		netdev_err(ndev, "timeout before we got a set response...\n");
		/*
		 * can't put_rndis_request, since we may still receive a
		 * send-completion.
		 */
		return -EBUSY;
	} else {
		set_complete = &request->response_msg.msg.set_complete;
		if (set_complete->status != RNDIS_STATUS_SUCCESS) {
			netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
				   set_complete->status);
			ret = -EINVAL;
		}
	}

cleanup:
	put_rndis_request(rdev, request);
	return ret;
}

static int
rndis_filter_set_offload_params(struct hv_device *hdev,
				struct ndis_offload_params *req_offloads)
{
	struct netvsc_device *nvdev = hv_get_drvdata(hdev);
	struct rndis_device *rdev = nvdev->extension;
	struct net_device *ndev = nvdev->ndev;
	struct rndis_request *request;
	struct rndis_set_request *set;
	struct ndis_offload_params *offload_params;
	struct rndis_set_complete *set_complete;
	u32 extlen = sizeof(struct ndis_offload_params);
	int ret;
	unsigned long t;
	u32 vsp_version = nvdev->nvsp_version;

	if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
		extlen = VERSION_4_OFFLOAD_SIZE;
		/* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
		 * UDP checksum offload.
		 */
		req_offloads->udp_ip_v4_csum = 0;
		req_offloads->udp_ip_v6_csum = 0;
	}

	request = get_rndis_request(rdev, RNDIS_MSG_SET,
		RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
	if (!request)
		return -ENOMEM;

	set = &request->request_msg.msg.set_req;
	set->oid = OID_TCP_OFFLOAD_PARAMETERS;
	set->info_buflen = extlen;
	set->info_buf_offset = sizeof(struct rndis_set_request);
	set->dev_vc_handle = 0;

	offload_params = (struct ndis_offload_params *)((ulong)set +
				set->info_buf_offset);
	*offload_params = *req_offloads;
	offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
	offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
	offload_params->header.size = extlen;

	ret = rndis_filter_send_request(rdev, request);
	if (ret != 0)
		goto cleanup;

	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
	if (t == 0) {
		netdev_err(ndev, "timeout before we got aOFFLOAD set response...\n");
		/* can't put_rndis_request, since we may still receive a
		 * send-completion.
		 */
		return -EBUSY;
	} else {
		set_complete = &request->response_msg.msg.set_complete;
		if (set_complete->status != RNDIS_STATUS_SUCCESS) {
			netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
				   set_complete->status);
			ret = -EINVAL;
		}
	}

cleanup:
	put_rndis_request(rdev, request);
	return ret;
}

u8 netvsc_hash_key[HASH_KEYLEN] = {
	0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
	0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
	0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
	0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
	0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
};

static int rndis_filter_set_rss_param(struct rndis_device *rdev, int num_queue)
{
	struct net_device *ndev = rdev->net_dev->ndev;
	struct rndis_request *request;
	struct rndis_set_request *set;
	struct rndis_set_complete *set_complete;
	u32 extlen = sizeof(struct ndis_recv_scale_param) +
		     4*ITAB_NUM + HASH_KEYLEN;
	struct ndis_recv_scale_param *rssp;
	u32 *itab;
	u8 *keyp;
	int i, ret;
	unsigned long t;

	request = get_rndis_request(
			rdev, RNDIS_MSG_SET,
			RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
	if (!request)
		return -ENOMEM;

	set = &request->request_msg.msg.set_req;
	set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
	set->info_buflen = extlen;
	set->info_buf_offset = sizeof(struct rndis_set_request);
	set->dev_vc_handle = 0;

	rssp = (struct ndis_recv_scale_param *)(set + 1);
	rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
	rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
	rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
	rssp->flag = 0;
	rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
			 NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
			 NDIS_HASH_TCP_IPV6;
	rssp->indirect_tabsize = 4*ITAB_NUM;
	rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
	rssp->hashkey_size = HASH_KEYLEN;
	rssp->kashkey_offset = rssp->indirect_taboffset +
			       rssp->indirect_tabsize;

	/* Set indirection table entries */
	itab = (u32 *)(rssp + 1);
	for (i = 0; i < ITAB_NUM; i++)
		itab[i] = i % num_queue;

	/* Set hask key values */
	keyp = (u8 *)((unsigned long)rssp + rssp->kashkey_offset);
	for (i = 0; i < HASH_KEYLEN; i++)
		keyp[i] = netvsc_hash_key[i];


	ret = rndis_filter_send_request(rdev, request);
	if (ret != 0)
		goto cleanup;

	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
	if (t == 0) {
		netdev_err(ndev, "timeout before we got a set response...\n");
		/* can't put_rndis_request, since we may still receive a
		 * send-completion.
		 */
		return -ETIMEDOUT;
	} else {
		set_complete = &request->response_msg.msg.set_complete;
		if (set_complete->status != RNDIS_STATUS_SUCCESS) {
			netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
				   set_complete->status);
			ret = -EINVAL;
		}
	}

cleanup:
	put_rndis_request(rdev, request);
	return ret;
}


static int rndis_filter_query_device_link_status(struct rndis_device *dev)
{
	u32 size = sizeof(u32);
	u32 link_status;
	int ret;

	ret = rndis_filter_query_device(dev,
				      RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
				      &link_status, &size);

	return ret;
}

int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
{
	struct rndis_request *request;
	struct rndis_set_request *set;
	struct rndis_set_complete *set_complete;
	u32 status;
	int ret;
	unsigned long t;
	struct net_device *ndev;

	ndev = dev->net_dev->ndev;

	request = get_rndis_request(dev, RNDIS_MSG_SET,
			RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
			sizeof(u32));
	if (!request) {
		ret = -ENOMEM;
		goto cleanup;
	}

	/* Setup the rndis set */
	set = &request->request_msg.msg.set_req;
	set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
	set->info_buflen = sizeof(u32);
	set->info_buf_offset = sizeof(struct rndis_set_request);

	memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
	       &new_filter, sizeof(u32));

	ret = rndis_filter_send_request(dev, request);
	if (ret != 0)
		goto cleanup;

	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);

	if (t == 0) {
		netdev_err(ndev,
			"timeout before we got a set response...\n");
		ret = -ETIMEDOUT;
		/*
		 * We can't deallocate the request since we may still receive a
		 * send completion for it.
		 */
		goto exit;
	} else {
		set_complete = &request->response_msg.msg.set_complete;
		status = set_complete->status;
	}

cleanup:
	if (request)
		put_rndis_request(dev, request);
exit:
	return ret;
}


static int rndis_filter_init_device(struct rndis_device *dev)
{
	struct rndis_request *request;
	struct rndis_initialize_request *init;
	struct rndis_initialize_complete *init_complete;
	u32 status;
	int ret;
	unsigned long t;
	struct netvsc_device *nvdev = dev->net_dev;

	request = get_rndis_request(dev, RNDIS_MSG_INIT,
			RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
	if (!request) {
		ret = -ENOMEM;
		goto cleanup;
	}

	/* Setup the rndis set */
	init = &request->request_msg.msg.init_req;
	init->major_ver = RNDIS_MAJOR_VERSION;
	init->minor_ver = RNDIS_MINOR_VERSION;
	init->max_xfer_size = 0x4000;

	dev->state = RNDIS_DEV_INITIALIZING;

	ret = rndis_filter_send_request(dev, request);
	if (ret != 0) {
		dev->state = RNDIS_DEV_UNINITIALIZED;
		goto cleanup;
	}


	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);

	if (t == 0) {
		ret = -ETIMEDOUT;
		goto cleanup;
	}

	init_complete = &request->response_msg.msg.init_complete;
	status = init_complete->status;
	if (status == RNDIS_STATUS_SUCCESS) {
		dev->state = RNDIS_DEV_INITIALIZED;
		nvdev->max_pkt = init_complete->max_pkt_per_msg;
		nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
		ret = 0;
	} else {
		dev->state = RNDIS_DEV_UNINITIALIZED;
		ret = -EINVAL;
	}

cleanup:
	if (request)
		put_rndis_request(dev, request);

	return ret;
}

static void rndis_filter_halt_device(struct rndis_device *dev)
{
	struct rndis_request *request;
	struct rndis_halt_request *halt;
	struct netvsc_device *nvdev = dev->net_dev;
	struct hv_device *hdev = nvdev->dev;
	ulong flags;

	/* Attempt to do a rndis device halt */
	request = get_rndis_request(dev, RNDIS_MSG_HALT,
				RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
	if (!request)
		goto cleanup;

	/* Setup the rndis set */
	halt = &request->request_msg.msg.halt_req;
	halt->req_id = atomic_inc_return(&dev->new_req_id);

	/* Ignore return since this msg is optional. */
	rndis_filter_send_request(dev, request);

	dev->state = RNDIS_DEV_UNINITIALIZED;

cleanup:
	spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
	nvdev->destroy = true;
	spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);

	/* Wait for all send completions */
	wait_event(nvdev->wait_drain,
		atomic_read(&nvdev->num_outstanding_sends) == 0);

	if (request)
		put_rndis_request(dev, request);
	return;
}

static int rndis_filter_open_device(struct rndis_device *dev)
{
	int ret;

	if (dev->state != RNDIS_DEV_INITIALIZED)
		return 0;

	ret = rndis_filter_set_packet_filter(dev,
					 NDIS_PACKET_TYPE_BROADCAST |
					 NDIS_PACKET_TYPE_ALL_MULTICAST |
					 NDIS_PACKET_TYPE_DIRECTED);
	if (ret == 0)
		dev->state = RNDIS_DEV_DATAINITIALIZED;

	return ret;
}

static int rndis_filter_close_device(struct rndis_device *dev)
{
	int ret;

	if (dev->state != RNDIS_DEV_DATAINITIALIZED)
		return 0;

	ret = rndis_filter_set_packet_filter(dev, 0);
	if (ret == -ENODEV)
		ret = 0;

	if (ret == 0)
		dev->state = RNDIS_DEV_INITIALIZED;

	return ret;
}

static void netvsc_sc_open(struct vmbus_channel *new_sc)
{
	struct netvsc_device *nvscdev;
	u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
	int ret;

	nvscdev = hv_get_drvdata(new_sc->primary_channel->device_obj);

	if (chn_index >= nvscdev->num_chn)
		return;

	set_per_channel_state(new_sc, nvscdev->sub_cb_buf + (chn_index - 1) *
			      NETVSC_PACKET_SIZE);

	ret = vmbus_open(new_sc, nvscdev->ring_size * PAGE_SIZE,
			 nvscdev->ring_size * PAGE_SIZE, NULL, 0,
			 netvsc_channel_cb, new_sc);

	if (ret == 0)
		nvscdev->chn_table[chn_index] = new_sc;
}

int rndis_filter_device_add(struct hv_device *dev,
				  void *additional_info)
{
	int ret;
	struct netvsc_device *net_device;
	struct rndis_device *rndis_device;
	struct netvsc_device_info *device_info = additional_info;
	struct ndis_offload_params offloads;
	struct nvsp_message *init_packet;
	unsigned long t;
	struct ndis_recv_scale_cap rsscap;
	u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
	u32 mtu, size;

	rndis_device = get_rndis_device();
	if (!rndis_device)
		return -ENODEV;

	/*
	 * Let the inner driver handle this first to create the netvsc channel
	 * NOTE! Once the channel is created, we may get a receive callback
	 * (RndisFilterOnReceive()) before this call is completed
	 */
	ret = netvsc_device_add(dev, additional_info);
	if (ret != 0) {
		kfree(rndis_device);
		return ret;
	}


	/* Initialize the rndis device */
	net_device = hv_get_drvdata(dev);
	net_device->max_chn = 1;
	net_device->num_chn = 1;

	net_device->extension = rndis_device;
	rndis_device->net_dev = net_device;

	/* Send the rndis initialization message */
	ret = rndis_filter_init_device(rndis_device);
	if (ret != 0) {
		rndis_filter_device_remove(dev);
		return ret;
	}

	/* Get the MTU from the host */
	size = sizeof(u32);
	ret = rndis_filter_query_device(rndis_device,
					RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
					&mtu, &size);
	if (ret == 0 && size == sizeof(u32))
		net_device->ndev->mtu = mtu;

	/* Get the mac address */
	ret = rndis_filter_query_device_mac(rndis_device);
	if (ret != 0) {
		rndis_filter_device_remove(dev);
		return ret;
	}

	memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);

	/* Turn on the offloads; the host supports all of the relevant
	 * offloads.
	 */
	memset(&offloads, 0, sizeof(struct ndis_offload_params));
	/* A value of zero means "no change"; now turn on what we
	 * want.
	 */
	offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
	offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
	offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
	offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
	offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
	offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;


	ret = rndis_filter_set_offload_params(dev, &offloads);
	if (ret)
		goto err_dev_remv;

	rndis_filter_query_device_link_status(rndis_device);

	device_info->link_state = rndis_device->link_state;

	dev_info(&dev->device, "Device MAC %pM link state %s\n",
		 rndis_device->hw_mac_adr,
		 device_info->link_state ? "down" : "up");

	if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
		return 0;

	/* vRSS setup */
	memset(&rsscap, 0, rsscap_size);
	ret = rndis_filter_query_device(rndis_device,
					OID_GEN_RECEIVE_SCALE_CAPABILITIES,
					&rsscap, &rsscap_size);
	if (ret || rsscap.num_recv_que < 2)
		goto out;

	net_device->max_chn = rsscap.num_recv_que;
	net_device->num_chn = (num_online_cpus() < rsscap.num_recv_que) ?
			       num_online_cpus() : rsscap.num_recv_que;
	if (net_device->num_chn == 1)
		goto out;

	net_device->sub_cb_buf = vzalloc((net_device->num_chn - 1) *
					 NETVSC_PACKET_SIZE);
	if (!net_device->sub_cb_buf) {
		net_device->num_chn = 1;
		dev_info(&dev->device, "No memory for subchannels.\n");
		goto out;
	}

	vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);

	init_packet = &net_device->channel_init_pkt;
	memset(init_packet, 0, sizeof(struct nvsp_message));
	init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
	init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
	init_packet->msg.v5_msg.subchn_req.num_subchannels =
						net_device->num_chn - 1;
	ret = vmbus_sendpacket(dev->channel, init_packet,
			       sizeof(struct nvsp_message),
			       (unsigned long)init_packet,
			       VM_PKT_DATA_INBAND,
			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
	if (ret)
		goto out;
	t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
	if (t == 0) {
		ret = -ETIMEDOUT;
		goto out;
	}
	if (init_packet->msg.v5_msg.subchn_comp.status !=
	    NVSP_STAT_SUCCESS) {
		ret = -ENODEV;
		goto out;
	}
	net_device->num_chn = 1 +
		init_packet->msg.v5_msg.subchn_comp.num_subchannels;

	ret = rndis_filter_set_rss_param(rndis_device, net_device->num_chn);

out:
	if (ret) {
		net_device->max_chn = 1;
		net_device->num_chn = 1;
	}
	return 0; /* return 0 because primary channel can be used alone */

err_dev_remv:
	rndis_filter_device_remove(dev);
	return ret;
}

void rndis_filter_device_remove(struct hv_device *dev)
{
	struct netvsc_device *net_dev = hv_get_drvdata(dev);
	struct rndis_device *rndis_dev = net_dev->extension;

	/* Halt and release the rndis device */
	rndis_filter_halt_device(rndis_dev);

	kfree(rndis_dev);
	net_dev->extension = NULL;

	netvsc_device_remove(dev);
}


int rndis_filter_open(struct hv_device *dev)
{
	struct netvsc_device *net_device = hv_get_drvdata(dev);

	if (!net_device)
		return -EINVAL;

	return rndis_filter_open_device(net_device->extension);
}

int rndis_filter_close(struct hv_device *dev)
{
	struct netvsc_device *nvdev = hv_get_drvdata(dev);

	if (!nvdev)
		return -EINVAL;

	return rndis_filter_close_device(nvdev->extension);
}