xref: /openbmc/linux/net/caif/cfctrl.c (revision edfd52e6) 
1 /*
2  * Copyright (C) ST-Ericsson AB 2010
3  * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
4  * License terms: GNU General Public License (GPL) version 2
5  */
6 
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8 
9 #include <linux/stddef.h>
10 #include <linux/spinlock.h>
11 #include <linux/slab.h>
12 #include <net/caif/caif_layer.h>
13 #include <net/caif/cfpkt.h>
14 #include <net/caif/cfctrl.h>
15 
16 #define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
17 #define UTILITY_NAME_LENGTH 16
18 #define CFPKT_CTRL_PKT_LEN 20
19 
20 #ifdef CAIF_NO_LOOP
21 static int handle_loop(struct cfctrl *ctrl,
22 			      int cmd, struct cfpkt *pkt){
23 	return -1;
24 }
25 #else
26 static int handle_loop(struct cfctrl *ctrl,
27 		int cmd, struct cfpkt *pkt);
28 #endif
29 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
30 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
31 			   int phyid);
32 
33 
34 struct cflayer *cfctrl_create(void)
35 {
36 	struct dev_info dev_info;
37 	struct cfctrl *this =
38 		kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
39 	if (!this)
40 		return NULL;
41 	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
42 	memset(&dev_info, 0, sizeof(dev_info));
43 	dev_info.id = 0xff;
44 	cfsrvl_init(&this->serv, 0, &dev_info, false);
45 	atomic_set(&this->req_seq_no, 1);
46 	atomic_set(&this->rsp_seq_no, 1);
47 	this->serv.layer.receive = cfctrl_recv;
48 	sprintf(this->serv.layer.name, "ctrl");
49 	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
50 #ifndef CAIF_NO_LOOP
51 	spin_lock_init(&this->loop_linkid_lock);
52 	this->loop_linkid = 1;
53 #endif
54 	spin_lock_init(&this->info_list_lock);
55 	INIT_LIST_HEAD(&this->list);
56 	return &this->serv.layer;
57 }
58 
59 void cfctrl_remove(struct cflayer *layer)
60 {
61 	struct cfctrl_request_info *p, *tmp;
62 	struct cfctrl *ctrl = container_obj(layer);
63 
64 	spin_lock_bh(&ctrl->info_list_lock);
65 	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
66 		list_del(&p->list);
67 		kfree(p);
68 	}
69 	spin_unlock_bh(&ctrl->info_list_lock);
70 	kfree(layer);
71 }
72 
73 static bool param_eq(const struct cfctrl_link_param *p1,
74 			const struct cfctrl_link_param *p2)
75 {
76 	bool eq =
77 	    p1->linktype == p2->linktype &&
78 	    p1->priority == p2->priority &&
79 	    p1->phyid == p2->phyid &&
80 	    p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
81 
82 	if (!eq)
83 		return false;
84 
85 	switch (p1->linktype) {
86 	case CFCTRL_SRV_VEI:
87 		return true;
88 	case CFCTRL_SRV_DATAGRAM:
89 		return p1->u.datagram.connid == p2->u.datagram.connid;
90 	case CFCTRL_SRV_RFM:
91 		return
92 		    p1->u.rfm.connid == p2->u.rfm.connid &&
93 		    strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
94 	case CFCTRL_SRV_UTIL:
95 		return
96 		    p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
97 		    && p1->u.utility.fifosize_bufs ==
98 		    p2->u.utility.fifosize_bufs
99 		    && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
100 		    && p1->u.utility.paramlen == p2->u.utility.paramlen
101 		    && memcmp(p1->u.utility.params, p2->u.utility.params,
102 			      p1->u.utility.paramlen) == 0;
103 
104 	case CFCTRL_SRV_VIDEO:
105 		return p1->u.video.connid == p2->u.video.connid;
106 	case CFCTRL_SRV_DBG:
107 		return true;
108 	case CFCTRL_SRV_DECM:
109 		return false;
110 	default:
111 		return false;
112 	}
113 	return false;
114 }
115 
116 static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
117 			  const struct cfctrl_request_info *r2)
118 {
119 	if (r1->cmd != r2->cmd)
120 		return false;
121 	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
122 		return param_eq(&r1->param, &r2->param);
123 	else
124 		return r1->channel_id == r2->channel_id;
125 }
126 
127 /* Insert request at the end */
128 static void cfctrl_insert_req(struct cfctrl *ctrl,
129 			      struct cfctrl_request_info *req)
130 {
131 	spin_lock_bh(&ctrl->info_list_lock);
132 	atomic_inc(&ctrl->req_seq_no);
133 	req->sequence_no = atomic_read(&ctrl->req_seq_no);
134 	list_add_tail(&req->list, &ctrl->list);
135 	spin_unlock_bh(&ctrl->info_list_lock);
136 }
137 
138 /* Compare and remove request */
139 static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
140 						struct cfctrl_request_info *req)
141 {
142 	struct cfctrl_request_info *p, *tmp, *first;
143 
144 	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
145 
146 	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
147 		if (cfctrl_req_eq(req, p)) {
148 			if (p != first)
149 				pr_warn("Requests are not received in order\n");
150 
151 			atomic_set(&ctrl->rsp_seq_no,
152 					 p->sequence_no);
153 			list_del(&p->list);
154 			goto out;
155 		}
156 	}
157 	p = NULL;
158 out:
159 	return p;
160 }
161 
162 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
163 {
164 	struct cfctrl *this = container_obj(layer);
165 	return &this->res;
166 }
167 
168 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
169 {
170 	info->hdr_len = 0;
171 	info->channel_id = cfctrl->serv.layer.id;
172 	info->dev_info = &cfctrl->serv.dev_info;
173 }
174 
175 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
176 {
177 	struct cfctrl *cfctrl = container_obj(layer);
178 	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
179 	struct cflayer *dn = cfctrl->serv.layer.dn;
180 	if (!pkt)
181 		return;
182 	if (!dn) {
183 		pr_debug("not able to send enum request\n");
184 		return;
185 	}
186 	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
187 	init_info(cfpkt_info(pkt), cfctrl);
188 	cfpkt_info(pkt)->dev_info->id = physlinkid;
189 	cfctrl->serv.dev_info.id = physlinkid;
190 	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
191 	cfpkt_addbdy(pkt, physlinkid);
192 	dn->transmit(dn, pkt);
193 }
194 
195 int cfctrl_linkup_request(struct cflayer *layer,
196 			   struct cfctrl_link_param *param,
197 			   struct cflayer *user_layer)
198 {
199 	struct cfctrl *cfctrl = container_obj(layer);
200 	u32 tmp32;
201 	u16 tmp16;
202 	u8 tmp8;
203 	struct cfctrl_request_info *req;
204 	int ret;
205 	char utility_name[16];
206 	struct cfpkt *pkt;
207 	struct cflayer *dn = cfctrl->serv.layer.dn;
208 
209 	if (!dn) {
210 		pr_debug("not able to send linkup request\n");
211 		return -ENODEV;
212 	}
213 
214 	if (cfctrl_cancel_req(layer, user_layer) > 0) {
215 		/* Slight Paranoia, check if already connecting */
216 		pr_err("Duplicate connect request for same client\n");
217 		WARN_ON(1);
218 		return -EALREADY;
219 	}
220 
221 	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
222 	if (!pkt)
223 		return -ENOMEM;
224 	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
225 	cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
226 	cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
227 	cfpkt_addbdy(pkt, param->endpoint & 0x03);
228 
229 	switch (param->linktype) {
230 	case CFCTRL_SRV_VEI:
231 		break;
232 	case CFCTRL_SRV_VIDEO:
233 		cfpkt_addbdy(pkt, (u8) param->u.video.connid);
234 		break;
235 	case CFCTRL_SRV_DBG:
236 		break;
237 	case CFCTRL_SRV_DATAGRAM:
238 		tmp32 = cpu_to_le32(param->u.datagram.connid);
239 		cfpkt_add_body(pkt, &tmp32, 4);
240 		break;
241 	case CFCTRL_SRV_RFM:
242 		/* Construct a frame, convert DatagramConnectionID to network
243 		 * format long and copy it out...
244 		 */
245 		tmp32 = cpu_to_le32(param->u.rfm.connid);
246 		cfpkt_add_body(pkt, &tmp32, 4);
247 		/* Add volume name, including zero termination... */
248 		cfpkt_add_body(pkt, param->u.rfm.volume,
249 			       strlen(param->u.rfm.volume) + 1);
250 		break;
251 	case CFCTRL_SRV_UTIL:
252 		tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
253 		cfpkt_add_body(pkt, &tmp16, 2);
254 		tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
255 		cfpkt_add_body(pkt, &tmp16, 2);
256 		memset(utility_name, 0, sizeof(utility_name));
257 		strncpy(utility_name, param->u.utility.name,
258 			UTILITY_NAME_LENGTH - 1);
259 		cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
260 		tmp8 = param->u.utility.paramlen;
261 		cfpkt_add_body(pkt, &tmp8, 1);
262 		cfpkt_add_body(pkt, param->u.utility.params,
263 			       param->u.utility.paramlen);
264 		break;
265 	default:
266 		pr_warn("Request setup of bad link type = %d\n",
267 			param->linktype);
268 		return -EINVAL;
269 	}
270 	req = kzalloc(sizeof(*req), GFP_KERNEL);
271 	if (!req)
272 		return -ENOMEM;
273 	req->client_layer = user_layer;
274 	req->cmd = CFCTRL_CMD_LINK_SETUP;
275 	req->param = *param;
276 	cfctrl_insert_req(cfctrl, req);
277 	init_info(cfpkt_info(pkt), cfctrl);
278 	/*
279 	 * NOTE:Always send linkup and linkdown request on the same
280 	 *	device as the payload. Otherwise old queued up payload
281 	 *	might arrive with the newly allocated channel ID.
282 	 */
283 	cfpkt_info(pkt)->dev_info->id = param->phyid;
284 	ret =
285 	    dn->transmit(dn, pkt);
286 	if (ret < 0) {
287 		int count;
288 
289 		count = cfctrl_cancel_req(&cfctrl->serv.layer,
290 						user_layer);
291 		if (count != 1)
292 			pr_err("Could not remove request (%d)", count);
293 			return -ENODEV;
294 	}
295 	return 0;
296 }
297 
298 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
299 				struct cflayer *client)
300 {
301 	int ret;
302 	struct cfctrl *cfctrl = container_obj(layer);
303 	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
304 	struct cflayer *dn = cfctrl->serv.layer.dn;
305 
306 	if (!pkt)
307 		return -ENOMEM;
308 
309 	if (!dn) {
310 		pr_debug("not able to send link-down request\n");
311 		return -ENODEV;
312 	}
313 
314 	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
315 	cfpkt_addbdy(pkt, channelid);
316 	init_info(cfpkt_info(pkt), cfctrl);
317 	ret =
318 	    dn->transmit(dn, pkt);
319 #ifndef CAIF_NO_LOOP
320 	cfctrl->loop_linkused[channelid] = 0;
321 #endif
322 	return ret;
323 }
324 
325 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
326 {
327 	struct cfctrl_request_info *p, *tmp;
328 	struct cfctrl *ctrl = container_obj(layr);
329 	int found = 0;
330 	spin_lock_bh(&ctrl->info_list_lock);
331 
332 	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
333 		if (p->client_layer == adap_layer) {
334 			list_del(&p->list);
335 			kfree(p);
336 			found++;
337 		}
338 	}
339 
340 	spin_unlock_bh(&ctrl->info_list_lock);
341 	return found;
342 }
343 
344 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
345 {
346 	u8 cmdrsp;
347 	u8 cmd;
348 	int ret = -1;
349 	u16 tmp16;
350 	u8 len;
351 	u8 param[255];
352 	u8 linkid;
353 	struct cfctrl *cfctrl = container_obj(layer);
354 	struct cfctrl_request_info rsp, *req;
355 
356 
357 	cfpkt_extr_head(pkt, &cmdrsp, 1);
358 	cmd = cmdrsp & CFCTRL_CMD_MASK;
359 	if (cmd != CFCTRL_CMD_LINK_ERR
360 	    && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
361 		&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
362 		if (handle_loop(cfctrl, cmd, pkt) != 0)
363 			cmdrsp |= CFCTRL_ERR_BIT;
364 	}
365 
366 	switch (cmd) {
367 	case CFCTRL_CMD_LINK_SETUP:
368 		{
369 			enum cfctrl_srv serv;
370 			enum cfctrl_srv servtype;
371 			u8 endpoint;
372 			u8 physlinkid;
373 			u8 prio;
374 			u8 tmp;
375 			u32 tmp32;
376 			u8 *cp;
377 			int i;
378 			struct cfctrl_link_param linkparam;
379 			memset(&linkparam, 0, sizeof(linkparam));
380 
381 			cfpkt_extr_head(pkt, &tmp, 1);
382 
383 			serv = tmp & CFCTRL_SRV_MASK;
384 			linkparam.linktype = serv;
385 
386 			servtype = tmp >> 4;
387 			linkparam.chtype = servtype;
388 
389 			cfpkt_extr_head(pkt, &tmp, 1);
390 			physlinkid = tmp & 0x07;
391 			prio = tmp >> 3;
392 
393 			linkparam.priority = prio;
394 			linkparam.phyid = physlinkid;
395 			cfpkt_extr_head(pkt, &endpoint, 1);
396 			linkparam.endpoint = endpoint & 0x03;
397 
398 			switch (serv) {
399 			case CFCTRL_SRV_VEI:
400 			case CFCTRL_SRV_DBG:
401 				if (CFCTRL_ERR_BIT & cmdrsp)
402 					break;
403 				/* Link ID */
404 				cfpkt_extr_head(pkt, &linkid, 1);
405 				break;
406 			case CFCTRL_SRV_VIDEO:
407 				cfpkt_extr_head(pkt, &tmp, 1);
408 				linkparam.u.video.connid = tmp;
409 				if (CFCTRL_ERR_BIT & cmdrsp)
410 					break;
411 				/* Link ID */
412 				cfpkt_extr_head(pkt, &linkid, 1);
413 				break;
414 
415 			case CFCTRL_SRV_DATAGRAM:
416 				cfpkt_extr_head(pkt, &tmp32, 4);
417 				linkparam.u.datagram.connid =
418 				    le32_to_cpu(tmp32);
419 				if (CFCTRL_ERR_BIT & cmdrsp)
420 					break;
421 				/* Link ID */
422 				cfpkt_extr_head(pkt, &linkid, 1);
423 				break;
424 			case CFCTRL_SRV_RFM:
425 				/* Construct a frame, convert
426 				 * DatagramConnectionID
427 				 * to network format long and copy it out...
428 				 */
429 				cfpkt_extr_head(pkt, &tmp32, 4);
430 				linkparam.u.rfm.connid =
431 				  le32_to_cpu(tmp32);
432 				cp = (u8 *) linkparam.u.rfm.volume;
433 				for (cfpkt_extr_head(pkt, &tmp, 1);
434 				     cfpkt_more(pkt) && tmp != '\0';
435 				     cfpkt_extr_head(pkt, &tmp, 1))
436 					*cp++ = tmp;
437 				*cp = '\0';
438 
439 				if (CFCTRL_ERR_BIT & cmdrsp)
440 					break;
441 				/* Link ID */
442 				cfpkt_extr_head(pkt, &linkid, 1);
443 
444 				break;
445 			case CFCTRL_SRV_UTIL:
446 				/* Construct a frame, convert
447 				 * DatagramConnectionID
448 				 * to network format long and copy it out...
449 				 */
450 				/* Fifosize KB */
451 				cfpkt_extr_head(pkt, &tmp16, 2);
452 				linkparam.u.utility.fifosize_kb =
453 				    le16_to_cpu(tmp16);
454 				/* Fifosize bufs */
455 				cfpkt_extr_head(pkt, &tmp16, 2);
456 				linkparam.u.utility.fifosize_bufs =
457 				    le16_to_cpu(tmp16);
458 				/* name */
459 				cp = (u8 *) linkparam.u.utility.name;
460 				caif_assert(sizeof(linkparam.u.utility.name)
461 					     >= UTILITY_NAME_LENGTH);
462 				for (i = 0;
463 				     i < UTILITY_NAME_LENGTH
464 				     && cfpkt_more(pkt); i++) {
465 					cfpkt_extr_head(pkt, &tmp, 1);
466 					*cp++ = tmp;
467 				}
468 				/* Length */
469 				cfpkt_extr_head(pkt, &len, 1);
470 				linkparam.u.utility.paramlen = len;
471 				/* Param Data */
472 				cp = linkparam.u.utility.params;
473 				while (cfpkt_more(pkt) && len--) {
474 					cfpkt_extr_head(pkt, &tmp, 1);
475 					*cp++ = tmp;
476 				}
477 				if (CFCTRL_ERR_BIT & cmdrsp)
478 					break;
479 				/* Link ID */
480 				cfpkt_extr_head(pkt, &linkid, 1);
481 				/* Length */
482 				cfpkt_extr_head(pkt, &len, 1);
483 				/* Param Data */
484 				cfpkt_extr_head(pkt, &param, len);
485 				break;
486 			default:
487 				pr_warn("Request setup, invalid type (%d)\n",
488 					serv);
489 				goto error;
490 			}
491 
492 			rsp.cmd = cmd;
493 			rsp.param = linkparam;
494 			spin_lock_bh(&cfctrl->info_list_lock);
495 			req = cfctrl_remove_req(cfctrl, &rsp);
496 
497 			if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
498 				cfpkt_erroneous(pkt)) {
499 				pr_err("Invalid O/E bit or parse error "
500 						"on CAIF control channel\n");
501 				cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
502 						       0,
503 						       req ? req->client_layer
504 						       : NULL);
505 			} else {
506 				cfctrl->res.linksetup_rsp(cfctrl->serv.
507 							  layer.up, linkid,
508 							  serv, physlinkid,
509 							  req ? req->
510 							  client_layer : NULL);
511 			}
512 
513 			if (req != NULL)
514 				kfree(req);
515 
516 			spin_unlock_bh(&cfctrl->info_list_lock);
517 		}
518 		break;
519 	case CFCTRL_CMD_LINK_DESTROY:
520 		cfpkt_extr_head(pkt, &linkid, 1);
521 		cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
522 		break;
523 	case CFCTRL_CMD_LINK_ERR:
524 		pr_err("Frame Error Indication received\n");
525 		cfctrl->res.linkerror_ind();
526 		break;
527 	case CFCTRL_CMD_ENUM:
528 		cfctrl->res.enum_rsp();
529 		break;
530 	case CFCTRL_CMD_SLEEP:
531 		cfctrl->res.sleep_rsp();
532 		break;
533 	case CFCTRL_CMD_WAKE:
534 		cfctrl->res.wake_rsp();
535 		break;
536 	case CFCTRL_CMD_LINK_RECONF:
537 		cfctrl->res.restart_rsp();
538 		break;
539 	case CFCTRL_CMD_RADIO_SET:
540 		cfctrl->res.radioset_rsp();
541 		break;
542 	default:
543 		pr_err("Unrecognized Control Frame\n");
544 		goto error;
545 		break;
546 	}
547 	ret = 0;
548 error:
549 	cfpkt_destroy(pkt);
550 	return ret;
551 }
552 
553 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
554 			int phyid)
555 {
556 	struct cfctrl *this = container_obj(layr);
557 	switch (ctrl) {
558 	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
559 	case CAIF_CTRLCMD_FLOW_OFF_IND:
560 		spin_lock_bh(&this->info_list_lock);
561 		if (!list_empty(&this->list))
562 			pr_debug("Received flow off in control layer\n");
563 		spin_unlock_bh(&this->info_list_lock);
564 		break;
565 	case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
566 		struct cfctrl_request_info *p, *tmp;
567 
568 		/* Find all connect request and report failure */
569 		spin_lock_bh(&this->info_list_lock);
570 		list_for_each_entry_safe(p, tmp, &this->list, list) {
571 			if (p->param.phyid == phyid) {
572 				list_del(&p->list);
573 				p->client_layer->ctrlcmd(p->client_layer,
574 						CAIF_CTRLCMD_INIT_FAIL_RSP,
575 						phyid);
576 				kfree(p);
577 			}
578 		}
579 		spin_unlock_bh(&this->info_list_lock);
580 		break;
581 	}
582 	default:
583 		break;
584 	}
585 }
586 
587 #ifndef CAIF_NO_LOOP
588 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
589 {
590 	static int last_linkid;
591 	static int dec;
592 	u8 linkid, linktype, tmp;
593 	switch (cmd) {
594 	case CFCTRL_CMD_LINK_SETUP:
595 		spin_lock_bh(&ctrl->loop_linkid_lock);
596 		if (!dec) {
597 			for (linkid = last_linkid + 1; linkid < 254; linkid++)
598 				if (!ctrl->loop_linkused[linkid])
599 					goto found;
600 		}
601 		dec = 1;
602 		for (linkid = last_linkid - 1; linkid > 1; linkid--)
603 			if (!ctrl->loop_linkused[linkid])
604 				goto found;
605 		spin_unlock_bh(&ctrl->loop_linkid_lock);
606 		return -1;
607 found:
608 		if (linkid < 10)
609 			dec = 0;
610 
611 		if (!ctrl->loop_linkused[linkid])
612 			ctrl->loop_linkused[linkid] = 1;
613 
614 		last_linkid = linkid;
615 
616 		cfpkt_add_trail(pkt, &linkid, 1);
617 		spin_unlock_bh(&ctrl->loop_linkid_lock);
618 		cfpkt_peek_head(pkt, &linktype, 1);
619 		if (linktype ==  CFCTRL_SRV_UTIL) {
620 			tmp = 0x01;
621 			cfpkt_add_trail(pkt, &tmp, 1);
622 			cfpkt_add_trail(pkt, &tmp, 1);
623 		}
624 		break;
625 
626 	case CFCTRL_CMD_LINK_DESTROY:
627 		spin_lock_bh(&ctrl->loop_linkid_lock);
628 		cfpkt_peek_head(pkt, &linkid, 1);
629 		ctrl->loop_linkused[linkid] = 0;
630 		spin_unlock_bh(&ctrl->loop_linkid_lock);
631 		break;
632 	default:
633 		break;
634 	}
635 	return 0;
636 }
637 #endif
638