summaryrefslogtreecommitdiffstats
path: root/sys/dev/hyperv/utilities/hv_kvp.c
blob: e82f55a0d787bb78e551ca3578786f1669627585 (plain)
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
/*-
 * Copyright (c) 2014 Microsoft Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *	Author:	Sainath Varanasi.
 *	Date:	4/2012
 *	Email:	bsdic@microsoft.com
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/reboot.h>
#include <sys/lock.h>
#include <sys/taskqueue.h>
#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/un.h>
#include <sys/endian.h>
#include <sys/_null.h>
#include <sys/signal.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <net/if_arp.h>

#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/netvsc/hv_net_vsc.h>

#include "unicode.h"
#include "hv_kvp.h"

/* hv_kvp defines */
#define BUFFERSIZE	sizeof(struct hv_kvp_msg)
#define KVP_SUCCESS	0
#define KVP_ERROR	1
#define kvp_hdr		hdr.kvp_hdr

/* hv_kvp debug control */
static int hv_kvp_log = 0;
SYSCTL_INT(_dev, OID_AUTO, hv_kvp_log, CTLFLAG_RW, &hv_kvp_log, 0,
	"hv_kvp log");

#define	hv_kvp_log_error(...)	do {				\
	if (hv_kvp_log > 0)				\
		log(LOG_ERR, "hv_kvp: " __VA_ARGS__);	\
} while (0)

#define	hv_kvp_log_info(...) do {				\
	if (hv_kvp_log > 1)				\
		log(LOG_INFO, "hv_kvp: " __VA_ARGS__);		\
} while (0)

/* character device prototypes */
static d_open_t		hv_kvp_dev_open;
static d_close_t	hv_kvp_dev_close;
static d_read_t		hv_kvp_dev_daemon_read;
static d_write_t	hv_kvp_dev_daemon_write;
static d_poll_t		hv_kvp_dev_daemon_poll;

/* hv_kvp prototypes */
static int	hv_kvp_req_in_progress(void);
static void	hv_kvp_transaction_init(uint32_t, hv_vmbus_channel *, uint64_t, uint8_t *);
static void	hv_kvp_send_msg_to_daemon(void);
static void	hv_kvp_process_request(void *context);

/* hv_kvp character device structure */
static struct cdevsw hv_kvp_cdevsw =
{
	.d_version	= D_VERSION,
	.d_open		= hv_kvp_dev_open,
	.d_close	= hv_kvp_dev_close,
	.d_read		= hv_kvp_dev_daemon_read,
	.d_write	= hv_kvp_dev_daemon_write,
	.d_poll		= hv_kvp_dev_daemon_poll,
	.d_name		= "hv_kvp_dev",
};
static struct cdev *hv_kvp_dev;
static struct hv_kvp_msg *hv_kvp_dev_buf;
struct proc *daemon_task;

static struct selinfo hv_kvp_selinfo;

/*
 * Global state to track and synchronize multiple
 * KVP transaction requests from the host.
 */
static struct {

	/* Pre-allocated work item for queue */
	hv_work_item		work_item;	

	/* Unless specified the pending mutex should be 
	 * used to alter the values of the following paramters:
	 * 1. req_in_progress
	 * 2. req_timed_out
	 * 3. pending_reqs.
	 */
	struct mtx		pending_mutex;	  
	
	/* To track if transaction is active or not */
	boolean_t		req_in_progress;    
	/* Tracks if daemon did not reply back in time */
	boolean_t		req_timed_out;	  
	/* Tracks if daemon is serving a request currently */
	boolean_t		daemon_busy;
	/* Count of KVP requests from Hyper-V. */
	uint64_t		pending_reqs;       
	
	
	/* Length of host message */
	uint32_t		host_msg_len;	    

	/* Pointer to channel */
	hv_vmbus_channel	*channelp;	    

	/* Host message id */
	uint64_t		host_msg_id;	   
	
	/* Current kvp message from the host */
	struct hv_kvp_msg	*host_kvp_msg;      
	
	 /* Current kvp message for daemon */
	struct hv_kvp_msg	daemon_kvp_msg;    
	
	/* Rcv buffer for communicating with the host*/
	uint8_t			*rcv_buf;	    
	
	/* Device semaphore to control communication */
	struct sema		dev_sema;	   
	
	/* Indicates if daemon registered with driver */
	boolean_t		register_done;      
	
	/* Character device status */
	boolean_t		dev_accessed;	    
} kvp_globals;

/* global vars */
MALLOC_DECLARE(M_HV_KVP_DEV_BUF);
MALLOC_DEFINE(M_HV_KVP_DEV_BUF, "hv_kvp_dev buffer", "buffer for hv_kvp_dev module");

/*
 * hv_kvp low level functions
 */

/*
 * Check if kvp transaction is in progres
 */
static int
hv_kvp_req_in_progress(void)
{

	return (kvp_globals.req_in_progress);
}


/*
 * This routine is called whenever a message is received from the host
 */
static void
hv_kvp_transaction_init(uint32_t rcv_len, hv_vmbus_channel *rcv_channel,
			uint64_t request_id, uint8_t *rcv_buf)
{
	
	/* Store all the relevant message details in the global structure */
	/* Do not need to use mutex for req_in_progress here */
	kvp_globals.req_in_progress = true;
	kvp_globals.host_msg_len = rcv_len;
	kvp_globals.channelp = rcv_channel;
	kvp_globals.host_msg_id = request_id;
	kvp_globals.rcv_buf = rcv_buf;
	kvp_globals.host_kvp_msg = (struct hv_kvp_msg *)&rcv_buf[
		sizeof(struct hv_vmbus_pipe_hdr) +
		sizeof(struct hv_vmbus_icmsg_hdr)];
}


/*
 * hv_kvp - version neogtiation function
 */
static void
hv_kvp_negotiate_version(struct hv_vmbus_icmsg_hdr *icmsghdrp,
			 struct hv_vmbus_icmsg_negotiate *negop,
			 uint8_t *buf)
{
	int icframe_vercnt;
	int icmsg_vercnt;

	icmsghdrp->icmsgsize = 0x10;

	negop = (struct hv_vmbus_icmsg_negotiate *)&buf[
		sizeof(struct hv_vmbus_pipe_hdr) +
		sizeof(struct hv_vmbus_icmsg_hdr)];
	icframe_vercnt = negop->icframe_vercnt;
	icmsg_vercnt = negop->icmsg_vercnt;

	/*
	 * Select the framework version number we will support
	 */
	if ((icframe_vercnt >= 2) && (negop->icversion_data[1].major == 3)) {
		icframe_vercnt = 3;
		if (icmsg_vercnt > 2)
			icmsg_vercnt = 4;
		else
			icmsg_vercnt = 3;
	} else {
		icframe_vercnt = 1;
		icmsg_vercnt = 1;
	}

	negop->icframe_vercnt = 1;
	negop->icmsg_vercnt = 1;
	negop->icversion_data[0].major = icframe_vercnt;
	negop->icversion_data[0].minor = 0;
	negop->icversion_data[1].major = icmsg_vercnt;
	negop->icversion_data[1].minor = 0;
}


/*
 * Convert ip related info in umsg from utf8 to utf16 and store in hmsg
 */
static int
hv_kvp_convert_utf8_ipinfo_to_utf16(struct hv_kvp_msg *umsg, 
				    struct hv_kvp_ip_msg *host_ip_msg)
{
	int err_ip, err_subnet, err_gway, err_dns, err_adap;
	int UNUSED_FLAG = 1;
 		
	utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.ip_addr,
	    MAX_IP_ADDR_SIZE,
	    (char *)umsg->body.kvp_ip_val.ip_addr,
	    strlen((char *)umsg->body.kvp_ip_val.ip_addr),
	    UNUSED_FLAG,
	    &err_ip);
	utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.sub_net,
	    MAX_IP_ADDR_SIZE,
	    (char *)umsg->body.kvp_ip_val.sub_net,
	    strlen((char *)umsg->body.kvp_ip_val.sub_net),
	    UNUSED_FLAG,
	    &err_subnet);
	utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.gate_way,
	    MAX_GATEWAY_SIZE,
	    (char *)umsg->body.kvp_ip_val.gate_way,
	    strlen((char *)umsg->body.kvp_ip_val.gate_way),
	    UNUSED_FLAG,
	    &err_gway);
	utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.dns_addr,
	    MAX_IP_ADDR_SIZE,
	    (char *)umsg->body.kvp_ip_val.dns_addr,
	    strlen((char *)umsg->body.kvp_ip_val.dns_addr),
	    UNUSED_FLAG,
	    &err_dns);
	utf8_to_utf16((uint16_t *)host_ip_msg->kvp_ip_val.adapter_id,
	    MAX_IP_ADDR_SIZE,
	    (char *)umsg->body.kvp_ip_val.adapter_id,
	    strlen((char *)umsg->body.kvp_ip_val.adapter_id),
	    UNUSED_FLAG,
	    &err_adap);
	
	host_ip_msg->kvp_ip_val.dhcp_enabled = umsg->body.kvp_ip_val.dhcp_enabled;
	host_ip_msg->kvp_ip_val.addr_family = umsg->body.kvp_ip_val.addr_family;

	return (err_ip | err_subnet | err_gway | err_dns | err_adap);
}


/*
 * Convert ip related info in hmsg from utf16 to utf8 and store in umsg
 */
static int
hv_kvp_convert_utf16_ipinfo_to_utf8(struct hv_kvp_ip_msg *host_ip_msg,
				    struct hv_kvp_msg *umsg)
{
	int err_ip, err_subnet, err_gway, err_dns, err_adap;
	int UNUSED_FLAG = 1;
	struct hv_device *hv_dev;       /* GUID Data Structure */
	hn_softc_t *sc;                 /* hn softc structure  */
	char if_name[4];
	char buf[39];

	device_t *devs;
	int devcnt;

	/* IP Address */
	utf16_to_utf8((char *)umsg->body.kvp_ip_val.ip_addr,
	    MAX_IP_ADDR_SIZE,
	    (uint16_t *)host_ip_msg->kvp_ip_val.ip_addr,
	    MAX_IP_ADDR_SIZE,
	    UNUSED_FLAG,
	    &err_ip);

	/* Adapter ID : GUID */
	utf16_to_utf8((char *)umsg->body.kvp_ip_val.adapter_id,
	    MAX_ADAPTER_ID_SIZE,
	    (uint16_t *)host_ip_msg->kvp_ip_val.adapter_id,
	    MAX_ADAPTER_ID_SIZE,
	    UNUSED_FLAG,
	    &err_adap);

	if (devclass_get_devices(devclass_find("hn"), &devs, &devcnt) == 0) {
		for (devcnt = devcnt - 1; devcnt >= 0; devcnt--) {
			sc = device_get_softc(devs[devcnt]);

			/* Trying to find GUID of Network Device */
			hv_dev = sc->hn_dev_obj;

			snprintf_hv_guid(buf, sizeof(buf), &hv_dev->device_id);
			sprintf(if_name, "%s%d", "hn", device_get_unit(devs[devcnt]));

			if (strncmp(buf, (char *)umsg->body.kvp_ip_val.adapter_id, 39) == 0) {
				strcpy((char *)umsg->body.kvp_ip_val.adapter_id, if_name);
				break;
			}
		}
		free(devs, M_TEMP);
	}

	/* Address Family , DHCP , SUBNET, Gateway, DNS */
	umsg->kvp_hdr.operation = host_ip_msg->operation;
	umsg->body.kvp_ip_val.addr_family = host_ip_msg->kvp_ip_val.addr_family;
	umsg->body.kvp_ip_val.dhcp_enabled = host_ip_msg->kvp_ip_val.dhcp_enabled;
	utf16_to_utf8((char *)umsg->body.kvp_ip_val.sub_net, MAX_IP_ADDR_SIZE,
	    (uint16_t *)host_ip_msg->kvp_ip_val.sub_net,
	    MAX_IP_ADDR_SIZE,
	    UNUSED_FLAG,
	    &err_subnet);
	
	utf16_to_utf8((char *)umsg->body.kvp_ip_val.gate_way, MAX_GATEWAY_SIZE,
	    (uint16_t *)host_ip_msg->kvp_ip_val.gate_way,
	    MAX_GATEWAY_SIZE,
	    UNUSED_FLAG,
	    &err_gway);

	utf16_to_utf8((char *)umsg->body.kvp_ip_val.dns_addr, MAX_IP_ADDR_SIZE,
	    (uint16_t *)host_ip_msg->kvp_ip_val.dns_addr,
	    MAX_IP_ADDR_SIZE,
	    UNUSED_FLAG,
	    &err_dns);

	return (err_ip | err_subnet | err_gway | err_dns | err_adap);
}


/*
 * Prepare a user kvp msg based on host kvp msg (utf16 to utf8)
 * Ensure utf16_utf8 takes care of the additional string terminating char!!
 */
static void
hv_kvp_convert_hostmsg_to_usermsg(void)
{
	int utf_err = 0;
	uint32_t value_type;
	struct hv_kvp_ip_msg *host_ip_msg = (struct hv_kvp_ip_msg *)
		kvp_globals.host_kvp_msg;

	struct hv_kvp_msg *hmsg = kvp_globals.host_kvp_msg;
	struct hv_kvp_msg *umsg = &kvp_globals.daemon_kvp_msg;

	memset(umsg, 0, sizeof(struct hv_kvp_msg));

	umsg->kvp_hdr.operation = hmsg->kvp_hdr.operation;
	umsg->kvp_hdr.pool = hmsg->kvp_hdr.pool;

	switch (umsg->kvp_hdr.operation) {
	case HV_KVP_OP_SET_IP_INFO:
		hv_kvp_convert_utf16_ipinfo_to_utf8(host_ip_msg, umsg);
		break;

	case HV_KVP_OP_GET_IP_INFO:
		utf16_to_utf8((char *)umsg->body.kvp_ip_val.adapter_id,
		    MAX_ADAPTER_ID_SIZE,
		    (uint16_t *)host_ip_msg->kvp_ip_val.adapter_id,
		    MAX_ADAPTER_ID_SIZE, 1, &utf_err);

		umsg->body.kvp_ip_val.addr_family =
		    host_ip_msg->kvp_ip_val.addr_family;
		break;

	case HV_KVP_OP_SET:
		value_type = hmsg->body.kvp_set.data.value_type;

		switch (value_type) {
		case HV_REG_SZ:
			umsg->body.kvp_set.data.value_size =
			    utf16_to_utf8(
				(char *)umsg->body.kvp_set.data.msg_value.value,
				HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1,
				(uint16_t *)hmsg->body.kvp_set.data.msg_value.value,
				hmsg->body.kvp_set.data.value_size,
				1, &utf_err);
			/* utf8 encoding */
			umsg->body.kvp_set.data.value_size =
			    umsg->body.kvp_set.data.value_size / 2;
			break;

		case HV_REG_U32:
			umsg->body.kvp_set.data.value_size =
			    sprintf(umsg->body.kvp_set.data.msg_value.value, "%d",
				hmsg->body.kvp_set.data.msg_value.value_u32) + 1;
			break;

		case HV_REG_U64:
			umsg->body.kvp_set.data.value_size =
			    sprintf(umsg->body.kvp_set.data.msg_value.value, "%llu",
				(unsigned long long)
				hmsg->body.kvp_set.data.msg_value.value_u64) + 1;
			break;
		}

		umsg->body.kvp_set.data.key_size =
		    utf16_to_utf8(
			umsg->body.kvp_set.data.key,
			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1,
			(uint16_t *)hmsg->body.kvp_set.data.key,
			hmsg->body.kvp_set.data.key_size,
			1, &utf_err);

		/* utf8 encoding */
		umsg->body.kvp_set.data.key_size =
		    umsg->body.kvp_set.data.key_size / 2;
		break;

	case HV_KVP_OP_GET:
		umsg->body.kvp_get.data.key_size =
		    utf16_to_utf8(umsg->body.kvp_get.data.key,
			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1,
			(uint16_t *)hmsg->body.kvp_get.data.key,
			hmsg->body.kvp_get.data.key_size,
			1, &utf_err);
		/* utf8 encoding */
		umsg->body.kvp_get.data.key_size =
		    umsg->body.kvp_get.data.key_size / 2;
		break;

	case HV_KVP_OP_DELETE:
		umsg->body.kvp_delete.key_size =
		    utf16_to_utf8(umsg->body.kvp_delete.key,
			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1,
			(uint16_t *)hmsg->body.kvp_delete.key,
			hmsg->body.kvp_delete.key_size,
			1, &utf_err);
		/* utf8 encoding */
		umsg->body.kvp_delete.key_size =
		    umsg->body.kvp_delete.key_size / 2;
		break;

	case HV_KVP_OP_ENUMERATE:
		umsg->body.kvp_enum_data.index =
		    hmsg->body.kvp_enum_data.index;
		break;

	default:
		hv_kvp_log_info("%s: daemon_kvp_msg: Invalid operation : %d\n",
		    __func__, umsg->kvp_hdr.operation);
	}
}


/*
 * Prepare a host kvp msg based on user kvp msg (utf8 to utf16)
 */
static int
hv_kvp_convert_usermsg_to_hostmsg(void)
{
	int hkey_len = 0, hvalue_len = 0, utf_err = 0;
	struct hv_kvp_exchg_msg_value *host_exchg_data;
	char *key_name, *value;

	struct hv_kvp_msg *umsg = &kvp_globals.daemon_kvp_msg;
	struct hv_kvp_msg *hmsg = kvp_globals.host_kvp_msg;
	struct hv_kvp_ip_msg *host_ip_msg = (struct hv_kvp_ip_msg *)hmsg;

	switch (hmsg->kvp_hdr.operation) {
	case HV_KVP_OP_GET_IP_INFO:
		return (hv_kvp_convert_utf8_ipinfo_to_utf16(umsg, host_ip_msg));

	case HV_KVP_OP_SET_IP_INFO:
	case HV_KVP_OP_SET:
	case HV_KVP_OP_DELETE:
		return (KVP_SUCCESS);

	case HV_KVP_OP_ENUMERATE:
		host_exchg_data = &hmsg->body.kvp_enum_data.data;
		key_name = umsg->body.kvp_enum_data.data.key;
		hkey_len = utf8_to_utf16((uint16_t *)host_exchg_data->key,
				((HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2),
				key_name, strlen(key_name),
				1, &utf_err);
		/* utf16 encoding */
		host_exchg_data->key_size = 2 * (hkey_len + 1);
		value = umsg->body.kvp_enum_data.data.msg_value.value;
		hvalue_len = utf8_to_utf16(
				(uint16_t *)host_exchg_data->msg_value.value,
				((HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2),
				value, strlen(value),
				1, &utf_err);
		host_exchg_data->value_size = 2 * (hvalue_len + 1);
		host_exchg_data->value_type = HV_REG_SZ;

		if ((hkey_len < 0) || (hvalue_len < 0))
			return (HV_KVP_E_FAIL);
			
		return (KVP_SUCCESS);

	case HV_KVP_OP_GET:
		host_exchg_data = &hmsg->body.kvp_get.data;
		value = umsg->body.kvp_get.data.msg_value.value;
		hvalue_len = utf8_to_utf16(
				(uint16_t *)host_exchg_data->msg_value.value,
				((HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2),
				value, strlen(value),
				1, &utf_err);
		/* Convert value size to uft16 */
		host_exchg_data->value_size = 2 * (hvalue_len + 1);
		/* Use values by string */
		host_exchg_data->value_type = HV_REG_SZ;

		if ((hkey_len < 0) || (hvalue_len < 0)) 
			return (HV_KVP_E_FAIL);
			
		return (KVP_SUCCESS);

	default:
		return (HV_KVP_E_FAIL);
	}
}


/*
 * Send the response back to the host.
 */
static void
hv_kvp_respond_host(int error)
{
	struct hv_vmbus_icmsg_hdr *hv_icmsg_hdrp;

	hv_icmsg_hdrp = (struct hv_vmbus_icmsg_hdr *)
	    &kvp_globals.rcv_buf[sizeof(struct hv_vmbus_pipe_hdr)];

	if (error)
		error = HV_KVP_E_FAIL;

	hv_icmsg_hdrp->status = error;
	hv_icmsg_hdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION | HV_ICMSGHDRFLAG_RESPONSE;
	
	error = hv_vmbus_channel_send_packet(kvp_globals.channelp,
			kvp_globals.rcv_buf,
			kvp_globals.host_msg_len, kvp_globals.host_msg_id,
			HV_VMBUS_PACKET_TYPE_DATA_IN_BAND, 0);

	if (error)
		hv_kvp_log_info("%s: hv_kvp_respond_host: sendpacket error:%d\n",
			__func__, error);
}


/*
 * This is the main kvp kernel process that interacts with both user daemon
 * and the host
 */
static void
hv_kvp_send_msg_to_daemon(void)
{
	/* Prepare kvp_msg to be sent to user */
	hv_kvp_convert_hostmsg_to_usermsg();

	/* Send the msg to user via function deamon_read - setting sema */
	sema_post(&kvp_globals.dev_sema);

	/* We should wake up the daemon, in case it's doing poll() */
	selwakeup(&hv_kvp_selinfo);
}


/*
 * Function to read the kvp request buffer from host
 * and interact with daemon
 */
static void
hv_kvp_process_request(void *context)
{
	uint8_t *kvp_buf;
	hv_vmbus_channel *channel = context;
	uint32_t recvlen = 0;
	uint64_t requestid;
	struct hv_vmbus_icmsg_hdr *icmsghdrp;
	int ret = 0;
	uint64_t pending_cnt = 1;
	
	hv_kvp_log_info("%s: entering hv_kvp_process_request\n", __func__);
	kvp_buf = receive_buffer[HV_KVP];
	ret = hv_vmbus_channel_recv_packet(channel, kvp_buf, 2 * PAGE_SIZE,
		&recvlen, &requestid);

	/*
	 * We start counting only after the daemon registers
	 * and therefore there could be requests pending in 
	 * the VMBus that are not reflected in pending_cnt.
	 * Therefore we continue reading as long as either of
	 * the below conditions is true.
	 */

	while ((pending_cnt>0) || ((ret == 0) && (recvlen > 0))) {

		if ((ret == 0) && (recvlen>0)) {
			
			icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
					&kvp_buf[sizeof(struct hv_vmbus_pipe_hdr)];
	
			hv_kvp_transaction_init(recvlen, channel, requestid, kvp_buf);
			if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
				hv_kvp_negotiate_version(icmsghdrp, NULL, kvp_buf);
				hv_kvp_respond_host(ret);
					
				/*
				 * It is ok to not acquire the mutex before setting 
				 * req_in_progress here because negotiation is the
				 * first thing that happens and hence there is no
				 * chance of a race condition.
				 */
				
				kvp_globals.req_in_progress = false;
				hv_kvp_log_info("%s :version negotiated\n", __func__);

			} else {
				if (!kvp_globals.daemon_busy) {

					hv_kvp_log_info("%s: issuing qury to daemon\n", __func__);
					mtx_lock(&kvp_globals.pending_mutex);
					kvp_globals.req_timed_out = false;
					kvp_globals.daemon_busy = true;
					mtx_unlock(&kvp_globals.pending_mutex);

					hv_kvp_send_msg_to_daemon();
					hv_kvp_log_info("%s: waiting for daemon\n", __func__);
				}
				
				/* Wait 5 seconds for daemon to respond back */
				tsleep(&kvp_globals, 0, "kvpworkitem", 5 * hz);
				hv_kvp_log_info("%s: came out of wait\n", __func__);
			}
		}

		mtx_lock(&kvp_globals.pending_mutex);
		
		/* Notice that once req_timed_out is set to true
		 * it will remain true until the next request is
		 * sent to the daemon. The response from daemon
		 * is forwarded to host only when this flag is 
		 * false. 
		 */
		kvp_globals.req_timed_out = true;

		/*
		 * Cancel request if so need be.
		 */
		if (hv_kvp_req_in_progress()) {
			hv_kvp_log_info("%s: request was still active after wait so failing\n", __func__);
			hv_kvp_respond_host(HV_KVP_E_FAIL);
			kvp_globals.req_in_progress = false;	
		}
	
		/*
		* Decrement pending request count and
		*/
		if (kvp_globals.pending_reqs>0) {
			kvp_globals.pending_reqs = kvp_globals.pending_reqs - 1;
		}
		pending_cnt = kvp_globals.pending_reqs;
		
		mtx_unlock(&kvp_globals.pending_mutex);

		/*
		 * Try reading next buffer
		 */
		recvlen = 0;
		ret = hv_vmbus_channel_recv_packet(channel, kvp_buf, 2 * PAGE_SIZE,
			&recvlen, &requestid);
		hv_kvp_log_info("%s: read: context %p, pending_cnt %llu ret =%d, recvlen=%d\n",
			__func__, context, (unsigned long long)pending_cnt, ret, recvlen);
	} 
}


/*
 * Callback routine that gets called whenever there is a message from host
 */
void
hv_kvp_callback(void *context)
{
	uint64_t pending_cnt = 0;

	if (kvp_globals.register_done == false) {
		
		kvp_globals.channelp = context;
	} else {
		
		mtx_lock(&kvp_globals.pending_mutex);
		kvp_globals.pending_reqs = kvp_globals.pending_reqs + 1;
		pending_cnt = kvp_globals.pending_reqs;
		mtx_unlock(&kvp_globals.pending_mutex);
		if (pending_cnt == 1) {
			hv_kvp_log_info("%s: Queuing work item\n", __func__);
			hv_queue_work_item(
					service_table[HV_KVP].work_queue,
					hv_kvp_process_request,
					context
					);
		}
	}	
}


/*
 * This function is called by the hv_kvp_init -
 * creates character device hv_kvp_dev 
 * allocates memory to hv_kvp_dev_buf
 *
 */
static int
hv_kvp_dev_init(void)
{
	int error = 0;

	/* initialize semaphore */
	sema_init(&kvp_globals.dev_sema, 0, "hv_kvp device semaphore");
	/* create character device */
	error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK,
			&hv_kvp_dev,
			&hv_kvp_cdevsw,
			0,
			UID_ROOT,
			GID_WHEEL,
			0640,
			"hv_kvp_dev");
					   
	if (error != 0)
		return (error);

	/*
	 * Malloc with M_WAITOK flag will never fail.
	 */
	hv_kvp_dev_buf = malloc(sizeof(*hv_kvp_dev_buf), M_HV_KVP_DEV_BUF, M_WAITOK |
				M_ZERO);

	return (0);
}


/*
 * This function is called by the hv_kvp_deinit -
 * destroy character device
 */
static void
hv_kvp_dev_destroy(void)
{

	if (daemon_task != NULL) {
		PROC_LOCK(daemon_task);
		kern_psignal(daemon_task, SIGKILL);
		PROC_UNLOCK(daemon_task);
	}
	
	destroy_dev(hv_kvp_dev);
	free(hv_kvp_dev_buf, M_HV_KVP_DEV_BUF);
	return;
}


static int
hv_kvp_dev_open(struct cdev *dev, int oflags, int devtype,
				struct thread *td)
{
	
	hv_kvp_log_info("%s: Opened device \"hv_kvp_device\" successfully.\n", __func__);
	if (kvp_globals.dev_accessed)
		return (-EBUSY);
	
	daemon_task = curproc;
	kvp_globals.dev_accessed = true;
	kvp_globals.daemon_busy = false;
	return (0);
}


static int
hv_kvp_dev_close(struct cdev *dev __unused, int fflag __unused, int devtype __unused,
				 struct thread *td __unused)
{

	hv_kvp_log_info("%s: Closing device \"hv_kvp_device\".\n", __func__);
	kvp_globals.dev_accessed = false;
	kvp_globals.register_done = false;
	return (0);
}


/*
 * hv_kvp_daemon read invokes this function
 * acts as a send to daemon
 */
static int
hv_kvp_dev_daemon_read(struct cdev *dev __unused, struct uio *uio, int ioflag __unused)
{
	size_t amt;
	int error = 0;

	/* Check hv_kvp daemon registration status*/
	if (!kvp_globals.register_done)
		return (KVP_ERROR);

	sema_wait(&kvp_globals.dev_sema);

	memcpy(hv_kvp_dev_buf, &kvp_globals.daemon_kvp_msg, sizeof(struct hv_kvp_msg));

	amt = MIN(uio->uio_resid, uio->uio_offset >= BUFFERSIZE + 1 ? 0 :
		BUFFERSIZE + 1 - uio->uio_offset);

	if ((error = uiomove(hv_kvp_dev_buf, amt, uio)) != 0)
		hv_kvp_log_info("%s: hv_kvp uiomove read failed!\n", __func__);

	return (error);
}


/*
 * hv_kvp_daemon write invokes this function
 * acts as a recieve from daemon
 */
static int
hv_kvp_dev_daemon_write(struct cdev *dev __unused, struct uio *uio, int ioflag __unused)
{
	size_t amt;
	int error = 0;

	uio->uio_offset = 0;

	amt = MIN(uio->uio_resid, BUFFERSIZE);
	error = uiomove(hv_kvp_dev_buf, amt, uio);

	if (error != 0)
		return (error);

	memcpy(&kvp_globals.daemon_kvp_msg, hv_kvp_dev_buf, sizeof(struct hv_kvp_msg));

	if (kvp_globals.register_done == false) {
		if (kvp_globals.daemon_kvp_msg.kvp_hdr.operation == HV_KVP_OP_REGISTER) {

			kvp_globals.register_done = true;
			if (kvp_globals.channelp) {
			
				hv_kvp_callback(kvp_globals.channelp);
			}
		}
		else {
			hv_kvp_log_info("%s, KVP Registration Failed\n", __func__);
			return (KVP_ERROR);
		}
	} else {

		mtx_lock(&kvp_globals.pending_mutex);

		if(!kvp_globals.req_timed_out) {

			hv_kvp_convert_usermsg_to_hostmsg();
			hv_kvp_respond_host(KVP_SUCCESS);
			wakeup(&kvp_globals);
			kvp_globals.req_in_progress = false;
		}

		kvp_globals.daemon_busy = false;
		mtx_unlock(&kvp_globals.pending_mutex);
	}

	return (error);
}


/*
 * hv_kvp_daemon poll invokes this function to check if data is available
 * for daemon to read.
 */
static int
hv_kvp_dev_daemon_poll(struct cdev *dev __unused, int events, struct thread *td)
{
	int revents = 0;

	mtx_lock(&kvp_globals.pending_mutex);
	/*
	 * We check global flag daemon_busy for the data availiability for
	 * userland to read. Deamon_busy is set to true before driver has data
	 * for daemon to read. It is set to false after daemon sends
	 * then response back to driver.
	 */
	if (kvp_globals.daemon_busy == true)
		revents = POLLIN;
	else
		selrecord(td, &hv_kvp_selinfo);

	mtx_unlock(&kvp_globals.pending_mutex);

	return (revents);
}


/* 
 * hv_kvp initialization function 
 * called from hv_util service.
 *
 */
int
hv_kvp_init(hv_vmbus_service *srv)
{
	int error = 0;
	hv_work_queue *work_queue = NULL;
	
	memset(&kvp_globals, 0, sizeof(kvp_globals));

	work_queue = hv_work_queue_create("KVP Service");
	if (work_queue == NULL) {
		hv_kvp_log_info("%s: Work queue alloc failed\n", __func__);
		error = ENOMEM;
		hv_kvp_log_error("%s: ENOMEM\n", __func__);
		goto Finish;
	}
	srv->work_queue = work_queue;

	error = hv_kvp_dev_init();
	mtx_init(&kvp_globals.pending_mutex, "hv-kvp pending mutex",
		       	NULL, MTX_DEF);	
	kvp_globals.pending_reqs = 0;


Finish:
	return (error);
}


void
hv_kvp_deinit(void)
{
	hv_kvp_dev_destroy();
	mtx_destroy(&kvp_globals.pending_mutex);

	return;
}
OpenPOWER on IntegriCloud