summaryrefslogtreecommitdiffstats
path: root/net/caif/cfctrl.c
blob: a521d32cfe56beff3975264088d0f6b9d15f7ee5 (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
/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/stddef.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfctrl.h>

#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
#define UTILITY_NAME_LENGTH 16
#define CFPKT_CTRL_PKT_LEN 20


#ifdef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl,
			      int cmd, struct cfpkt *pkt){
	return CAIF_FAILURE;
}
#else
static int handle_loop(struct cfctrl *ctrl,
		int cmd, struct cfpkt *pkt);
#endif
static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			   int phyid);


struct cflayer *cfctrl_create(void)
{
	struct dev_info dev_info;
	struct cfctrl *this =
		kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	if (!this) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return NULL;
	}
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	memset(&dev_info, 0, sizeof(dev_info));
	dev_info.id = 0xff;
	memset(this, 0, sizeof(*this));
	cfsrvl_init(&this->serv, 0, &dev_info);
	spin_lock_init(&this->info_list_lock);
	atomic_set(&this->req_seq_no, 1);
	atomic_set(&this->rsp_seq_no, 1);
	this->serv.layer.receive = cfctrl_recv;
	sprintf(this->serv.layer.name, "ctrl");
	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
	spin_lock_init(&this->loop_linkid_lock);
	this->loop_linkid = 1;
	return &this->serv.layer;
}

static bool param_eq(struct cfctrl_link_param *p1, struct cfctrl_link_param *p2)
{
	bool eq =
	    p1->linktype == p2->linktype &&
	    p1->priority == p2->priority &&
	    p1->phyid == p2->phyid &&
	    p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;

	if (!eq)
		return false;

	switch (p1->linktype) {
	case CFCTRL_SRV_VEI:
		return true;
	case CFCTRL_SRV_DATAGRAM:
		return p1->u.datagram.connid == p2->u.datagram.connid;
	case CFCTRL_SRV_RFM:
		return
		    p1->u.rfm.connid == p2->u.rfm.connid &&
		    strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
	case CFCTRL_SRV_UTIL:
		return
		    p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
		    && p1->u.utility.fifosize_bufs ==
		    p2->u.utility.fifosize_bufs
		    && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
		    && p1->u.utility.paramlen == p2->u.utility.paramlen
		    && memcmp(p1->u.utility.params, p2->u.utility.params,
			      p1->u.utility.paramlen) == 0;

	case CFCTRL_SRV_VIDEO:
		return p1->u.video.connid == p2->u.video.connid;
	case CFCTRL_SRV_DBG:
		return true;
	case CFCTRL_SRV_DECM:
		return false;
	default:
		return false;
	}
	return false;
}

bool cfctrl_req_eq(struct cfctrl_request_info *r1,
		   struct cfctrl_request_info *r2)
{
	if (r1->cmd != r2->cmd)
		return false;
	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
		return param_eq(&r1->param, &r2->param);
	else
		return r1->channel_id == r2->channel_id;
}

/* Insert request at the end */
void cfctrl_insert_req(struct cfctrl *ctrl,
			      struct cfctrl_request_info *req)
{
	struct cfctrl_request_info *p;
	spin_lock(&ctrl->info_list_lock);
	req->next = NULL;
	atomic_inc(&ctrl->req_seq_no);
	req->sequence_no = atomic_read(&ctrl->req_seq_no);
	if (ctrl->first_req == NULL) {
		ctrl->first_req = req;
		spin_unlock(&ctrl->info_list_lock);
		return;
	}
	p = ctrl->first_req;
	while (p->next != NULL)
		p = p->next;
	p->next = req;
	spin_unlock(&ctrl->info_list_lock);
}

/* Compare and remove request */
struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
					      struct cfctrl_request_info *req)
{
	struct cfctrl_request_info *p;
	struct cfctrl_request_info *ret;

	spin_lock(&ctrl->info_list_lock);
	if (ctrl->first_req == NULL) {
		spin_unlock(&ctrl->info_list_lock);
		return NULL;
	}

	if (cfctrl_req_eq(req, ctrl->first_req)) {
		ret = ctrl->first_req;
		caif_assert(ctrl->first_req);
		atomic_set(&ctrl->rsp_seq_no,
				 ctrl->first_req->sequence_no);
		ctrl->first_req = ctrl->first_req->next;
		spin_unlock(&ctrl->info_list_lock);
		return ret;
	}

	p = ctrl->first_req;

	while (p->next != NULL) {
		if (cfctrl_req_eq(req, p->next)) {
			pr_warning("CAIF: %s(): Requests are not "
					"received in order\n",
					__func__);
			ret = p->next;
			atomic_set(&ctrl->rsp_seq_no,
					p->next->sequence_no);
			p->next = p->next->next;
			spin_unlock(&ctrl->info_list_lock);
			return ret;
		}
		p = p->next;
	}
	spin_unlock(&ctrl->info_list_lock);

	pr_warning("CAIF: %s(): Request does not match\n",
		   __func__);
	return NULL;
}

struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
{
	struct cfctrl *this = container_obj(layer);
	return &this->res;
}

void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
{
	this->dn = dn;
}

void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
{
	this->up = up;
}

static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
{
	info->hdr_len = 0;
	info->channel_id = cfctrl->serv.layer.id;
	info->dev_info = &cfctrl->serv.dev_info;
}

void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
{
	struct cfctrl *cfctrl = container_obj(layer);
	int ret;
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return;
	}
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	init_info(cfpkt_info(pkt), cfctrl);
	cfpkt_info(pkt)->dev_info->id = physlinkid;
	cfctrl->serv.dev_info.id = physlinkid;
	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
	cfpkt_addbdy(pkt, physlinkid);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0) {
		pr_err("CAIF: %s(): Could not transmit enum message\n",
			__func__);
		cfpkt_destroy(pkt);
	}
}

int cfctrl_linkup_request(struct cflayer *layer,
			   struct cfctrl_link_param *param,
			   struct cflayer *user_layer)
{
	struct cfctrl *cfctrl = container_obj(layer);
	u32 tmp32;
	u16 tmp16;
	u8 tmp8;
	struct cfctrl_request_info *req;
	int ret;
	char utility_name[16];
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return -ENOMEM;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
	cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
	cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
	cfpkt_addbdy(pkt, param->endpoint & 0x03);

	switch (param->linktype) {
	case CFCTRL_SRV_VEI:
		break;
	case CFCTRL_SRV_VIDEO:
		cfpkt_addbdy(pkt, (u8) param->u.video.connid);
		break;
	case CFCTRL_SRV_DBG:
		break;
	case CFCTRL_SRV_DATAGRAM:
		tmp32 = cpu_to_le32(param->u.datagram.connid);
		cfpkt_add_body(pkt, &tmp32, 4);
		break;
	case CFCTRL_SRV_RFM:
		/* Construct a frame, convert DatagramConnectionID to network
		 * format long and copy it out...
		 */
		tmp32 = cpu_to_le32(param->u.rfm.connid);
		cfpkt_add_body(pkt, &tmp32, 4);
		/* Add volume name, including zero termination... */
		cfpkt_add_body(pkt, param->u.rfm.volume,
			       strlen(param->u.rfm.volume) + 1);
		break;
	case CFCTRL_SRV_UTIL:
		tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
		cfpkt_add_body(pkt, &tmp16, 2);
		tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
		cfpkt_add_body(pkt, &tmp16, 2);
		memset(utility_name, 0, sizeof(utility_name));
		strncpy(utility_name, param->u.utility.name,
			UTILITY_NAME_LENGTH - 1);
		cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
		tmp8 = param->u.utility.paramlen;
		cfpkt_add_body(pkt, &tmp8, 1);
		cfpkt_add_body(pkt, param->u.utility.params,
			       param->u.utility.paramlen);
		break;
	default:
		pr_warning("CAIF: %s():Request setup of bad link type = %d\n",
			   __func__, param->linktype);
		return -EINVAL;
	}
	req = kmalloc(sizeof(*req), GFP_KERNEL);
	if (!req) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return -ENOMEM;
	}
	memset(req, 0, sizeof(*req));
	req->client_layer = user_layer;
	req->cmd = CFCTRL_CMD_LINK_SETUP;
	req->param = *param;
	cfctrl_insert_req(cfctrl, req);
	init_info(cfpkt_info(pkt), cfctrl);
	/*
	 * NOTE:Always send linkup and linkdown request on the same
	 *	device as the payload. Otherwise old queued up payload
	 *	might arrive with the newly allocated channel ID.
	 */
	cfpkt_info(pkt)->dev_info->id = param->phyid;
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0) {
		pr_err("CAIF: %s(): Could not transmit linksetup request\n",
			__func__);
		cfpkt_destroy(pkt);
		return -ENODEV;
	}
	return 0;
}

int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
				struct cflayer *client)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return -ENOMEM;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	cfpkt_addbdy(pkt, channelid);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0) {
		pr_err("CAIF: %s(): Could not transmit link-down request\n",
			__func__);
		cfpkt_destroy(pkt);
	}
	return ret;
}

void cfctrl_sleep_req(struct cflayer *layer)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0)
		cfpkt_destroy(pkt);
}

void cfctrl_wake_req(struct cflayer *layer)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0)
		cfpkt_destroy(pkt);
}

void cfctrl_getstartreason_req(struct cflayer *layer)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warning("CAIF: %s(): Out of memory\n", __func__);
		return;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0)
		cfpkt_destroy(pkt);
}


void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
	struct cfctrl_request_info *p, *req;
	struct cfctrl *ctrl = container_obj(layr);
	spin_lock(&ctrl->info_list_lock);

	if (ctrl->first_req == NULL) {
		spin_unlock(&ctrl->info_list_lock);
		return;
	}

	if (ctrl->first_req->client_layer == adap_layer) {

		req = ctrl->first_req;
		ctrl->first_req = ctrl->first_req->next;
		kfree(req);
	}

	p = ctrl->first_req;
	while (p != NULL && p->next != NULL) {
		if (p->next->client_layer == adap_layer) {

			req = p->next;
			p->next = p->next->next;
			kfree(p->next);
		}
		p = p->next;
	}

	spin_unlock(&ctrl->info_list_lock);
}

static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
{
	u8 cmdrsp;
	u8 cmd;
	int ret = -1;
	u16 tmp16;
	u8 len;
	u8 param[255];
	u8 linkid;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfctrl_request_info rsp, *req;


	cfpkt_extr_head(pkt, &cmdrsp, 1);
	cmd = cmdrsp & CFCTRL_CMD_MASK;
	if (cmd != CFCTRL_CMD_LINK_ERR
	    && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
		if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
			cmdrsp |= CFCTRL_ERR_BIT;
	}

	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		{
			enum cfctrl_srv serv;
			enum cfctrl_srv servtype;
			u8 endpoint;
			u8 physlinkid;
			u8 prio;
			u8 tmp;
			u32 tmp32;
			u8 *cp;
			int i;
			struct cfctrl_link_param linkparam;
			memset(&linkparam, 0, sizeof(linkparam));

			cfpkt_extr_head(pkt, &tmp, 1);

			serv = tmp & CFCTRL_SRV_MASK;
			linkparam.linktype = serv;

			servtype = tmp >> 4;
			linkparam.chtype = servtype;

			cfpkt_extr_head(pkt, &tmp, 1);
			physlinkid = tmp & 0x07;
			prio = tmp >> 3;

			linkparam.priority = prio;
			linkparam.phyid = physlinkid;
			cfpkt_extr_head(pkt, &endpoint, 1);
			linkparam.endpoint = endpoint & 0x03;

			switch (serv) {
			case CFCTRL_SRV_VEI:
			case CFCTRL_SRV_DBG:
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;
			case CFCTRL_SRV_VIDEO:
				cfpkt_extr_head(pkt, &tmp, 1);
				linkparam.u.video.connid = tmp;
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;

			case CFCTRL_SRV_DATAGRAM:
				cfpkt_extr_head(pkt, &tmp32, 4);
				linkparam.u.datagram.connid =
				    le32_to_cpu(tmp32);
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;
			case CFCTRL_SRV_RFM:
				/* Construct a frame, convert
				 * DatagramConnectionID
				 * to network format long and copy it out...
				 */
				cfpkt_extr_head(pkt, &tmp32, 4);
				linkparam.u.rfm.connid =
				  le32_to_cpu(tmp32);
				cp = (u8 *) linkparam.u.rfm.volume;
				for (cfpkt_extr_head(pkt, &tmp, 1);
				     cfpkt_more(pkt) && tmp != '\0';
				     cfpkt_extr_head(pkt, &tmp, 1))
					*cp++ = tmp;
				*cp = '\0';

				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);

				break;
			case CFCTRL_SRV_UTIL:
				/* Construct a frame, convert
				 * DatagramConnectionID
				 * to network format long and copy it out...
				 */
				/* Fifosize KB */
				cfpkt_extr_head(pkt, &tmp16, 2);
				linkparam.u.utility.fifosize_kb =
				    le16_to_cpu(tmp16);
				/* Fifosize bufs */
				cfpkt_extr_head(pkt, &tmp16, 2);
				linkparam.u.utility.fifosize_bufs =
				    le16_to_cpu(tmp16);
				/* name */
				cp = (u8 *) linkparam.u.utility.name;
				caif_assert(sizeof(linkparam.u.utility.name)
					     >= UTILITY_NAME_LENGTH);
				for (i = 0;
				     i < UTILITY_NAME_LENGTH
				     && cfpkt_more(pkt); i++) {
					cfpkt_extr_head(pkt, &tmp, 1);
					*cp++ = tmp;
				}
				/* Length */
				cfpkt_extr_head(pkt, &len, 1);
				linkparam.u.utility.paramlen = len;
				/* Param Data */
				cp = linkparam.u.utility.params;
				while (cfpkt_more(pkt) && len--) {
					cfpkt_extr_head(pkt, &tmp, 1);
					*cp++ = tmp;
				}
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				/* Length */
				cfpkt_extr_head(pkt, &len, 1);
				/* Param Data */
				cfpkt_extr_head(pkt, &param, len);
				break;
			default:
				pr_warning("CAIF: %s(): Request setup "
					   "- invalid link type (%d)",
					   __func__, serv);
				goto error;
			}

			rsp.cmd = cmd;
			rsp.param = linkparam;
			req = cfctrl_remove_req(cfctrl, &rsp);

			if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
				cfpkt_erroneous(pkt)) {
				pr_err("CAIF: %s(): Invalid O/E bit or parse "
				       "error on CAIF control channel",
					__func__);
				cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
						       0,
						       req ? req->client_layer
						       : NULL);
			} else {
				cfctrl->res.linksetup_rsp(cfctrl->serv.
							  layer.up, linkid,
							  serv, physlinkid,
							  req ? req->
							  client_layer : NULL);
			}

			if (req != NULL)
				kfree(req);
		}
		break;
	case CFCTRL_CMD_LINK_DESTROY:
		cfpkt_extr_head(pkt, &linkid, 1);
		cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
		break;
	case CFCTRL_CMD_LINK_ERR:
		pr_err("CAIF: %s(): Frame Error Indication received\n",
			__func__);
		cfctrl->res.linkerror_ind();
		break;
	case CFCTRL_CMD_ENUM:
		cfctrl->res.enum_rsp();
		break;
	case CFCTRL_CMD_SLEEP:
		cfctrl->res.sleep_rsp();
		break;
	case CFCTRL_CMD_WAKE:
		cfctrl->res.wake_rsp();
		break;
	case CFCTRL_CMD_LINK_RECONF:
		cfctrl->res.restart_rsp();
		break;
	case CFCTRL_CMD_RADIO_SET:
		cfctrl->res.radioset_rsp();
		break;
	default:
		pr_err("CAIF: %s(): Unrecognized Control Frame\n", __func__);
		goto error;
		break;
	}
	ret = 0;
error:
	cfpkt_destroy(pkt);
	return ret;
}

static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			int phyid)
{
	struct cfctrl *this = container_obj(layr);
	switch (ctrl) {
	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
	case CAIF_CTRLCMD_FLOW_OFF_IND:
		spin_lock(&this->info_list_lock);
		if (this->first_req != NULL) {
			pr_debug("CAIF: %s(): Received flow off in "
				   "control layer", __func__);
		}
		spin_unlock(&this->info_list_lock);
		break;
	default:
		break;
	}
}

#ifndef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
{
	static int last_linkid;
	u8 linkid, linktype, tmp;
	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		spin_lock(&ctrl->loop_linkid_lock);
		for (linkid = last_linkid + 1; linkid < 255; linkid++)
			if (!ctrl->loop_linkused[linkid])
				goto found;
		for (linkid = last_linkid - 1; linkid > 0; linkid--)
			if (!ctrl->loop_linkused[linkid])
				goto found;
		spin_unlock(&ctrl->loop_linkid_lock);
		pr_err("CAIF: %s(): Out of link-ids\n", __func__);
		return -EINVAL;
found:
		if (!ctrl->loop_linkused[linkid])
			ctrl->loop_linkused[linkid] = 1;

		last_linkid = linkid;

		cfpkt_add_trail(pkt, &linkid, 1);
		spin_unlock(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linktype, 1);
		if (linktype ==  CFCTRL_SRV_UTIL) {
			tmp = 0x01;
			cfpkt_add_trail(pkt, &tmp, 1);
			cfpkt_add_trail(pkt, &tmp, 1);
		}
		break;

	case CFCTRL_CMD_LINK_DESTROY:
		spin_lock(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linkid, 1);
		ctrl->loop_linkused[linkid] = 0;
		spin_unlock(&ctrl->loop_linkid_lock);
		break;
	default:
		break;
	}
	return CAIF_SUCCESS;
}
#endif