caif: Remove noisy printout when disconnecting caif socket
[linux-2.6.git] / net / caif / cfctrl.c
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
21 #ifdef CAIF_NO_LOOP
22 static int handle_loop(struct cfctrl *ctrl,
23                               int cmd, struct cfpkt *pkt){
24         return -1;
25 }
26 #else
27 static int handle_loop(struct cfctrl *ctrl,
28                 int cmd, struct cfpkt *pkt);
29 #endif
30 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
31 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
32                            int phyid);
33
34
35 struct cflayer *cfctrl_create(void)
36 {
37         struct dev_info dev_info;
38         struct cfctrl *this =
39                 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
40         if (!this) {
41                 pr_warn("Out of memory\n");
42                 return NULL;
43         }
44         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
45         memset(&dev_info, 0, sizeof(dev_info));
46         dev_info.id = 0xff;
47         memset(this, 0, sizeof(*this));
48         cfsrvl_init(&this->serv, 0, &dev_info, false);
49         atomic_set(&this->req_seq_no, 1);
50         atomic_set(&this->rsp_seq_no, 1);
51         this->serv.layer.receive = cfctrl_recv;
52         sprintf(this->serv.layer.name, "ctrl");
53         this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
54         spin_lock_init(&this->loop_linkid_lock);
55         spin_lock_init(&this->info_list_lock);
56         INIT_LIST_HEAD(&this->list);
57         this->loop_linkid = 1;
58         return &this->serv.layer;
59 }
60
61 static bool param_eq(struct cfctrl_link_param *p1, struct cfctrl_link_param *p2)
62 {
63         bool eq =
64             p1->linktype == p2->linktype &&
65             p1->priority == p2->priority &&
66             p1->phyid == p2->phyid &&
67             p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
68
69         if (!eq)
70                 return false;
71
72         switch (p1->linktype) {
73         case CFCTRL_SRV_VEI:
74                 return true;
75         case CFCTRL_SRV_DATAGRAM:
76                 return p1->u.datagram.connid == p2->u.datagram.connid;
77         case CFCTRL_SRV_RFM:
78                 return
79                     p1->u.rfm.connid == p2->u.rfm.connid &&
80                     strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
81         case CFCTRL_SRV_UTIL:
82                 return
83                     p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
84                     && p1->u.utility.fifosize_bufs ==
85                     p2->u.utility.fifosize_bufs
86                     && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
87                     && p1->u.utility.paramlen == p2->u.utility.paramlen
88                     && memcmp(p1->u.utility.params, p2->u.utility.params,
89                               p1->u.utility.paramlen) == 0;
90
91         case CFCTRL_SRV_VIDEO:
92                 return p1->u.video.connid == p2->u.video.connid;
93         case CFCTRL_SRV_DBG:
94                 return true;
95         case CFCTRL_SRV_DECM:
96                 return false;
97         default:
98                 return false;
99         }
100         return false;
101 }
102
103 bool cfctrl_req_eq(struct cfctrl_request_info *r1,
104                    struct cfctrl_request_info *r2)
105 {
106         if (r1->cmd != r2->cmd)
107                 return false;
108         if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
109                 return param_eq(&r1->param, &r2->param);
110         else
111                 return r1->channel_id == r2->channel_id;
112 }
113
114 /* Insert request at the end */
115 void cfctrl_insert_req(struct cfctrl *ctrl,
116                               struct cfctrl_request_info *req)
117 {
118         spin_lock(&ctrl->info_list_lock);
119         atomic_inc(&ctrl->req_seq_no);
120         req->sequence_no = atomic_read(&ctrl->req_seq_no);
121         list_add_tail(&req->list, &ctrl->list);
122         spin_unlock(&ctrl->info_list_lock);
123 }
124
125 /* Compare and remove request */
126 struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
127                                               struct cfctrl_request_info *req)
128 {
129         struct cfctrl_request_info *p, *tmp, *first;
130
131         spin_lock(&ctrl->info_list_lock);
132         first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
133
134         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
135                 if (cfctrl_req_eq(req, p)) {
136                         if (p != first)
137                                 pr_warn("Requests are not received in order\n");
138
139                         atomic_set(&ctrl->rsp_seq_no,
140                                          p->sequence_no);
141                         list_del(&p->list);
142                         goto out;
143                 }
144         }
145         p = NULL;
146 out:
147         spin_unlock(&ctrl->info_list_lock);
148         return p;
149 }
150
151 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
152 {
153         struct cfctrl *this = container_obj(layer);
154         return &this->res;
155 }
156
157 void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
158 {
159         this->dn = dn;
160 }
161
162 void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
163 {
164         this->up = up;
165 }
166
167 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
168 {
169         info->hdr_len = 0;
170         info->channel_id = cfctrl->serv.layer.id;
171         info->dev_info = &cfctrl->serv.dev_info;
172 }
173
174 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
175 {
176         struct cfctrl *cfctrl = container_obj(layer);
177         int ret;
178         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
179         if (!pkt) {
180                 pr_warn("Out of memory\n");
181                 return;
182         }
183         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
184         init_info(cfpkt_info(pkt), cfctrl);
185         cfpkt_info(pkt)->dev_info->id = physlinkid;
186         cfctrl->serv.dev_info.id = physlinkid;
187         cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
188         cfpkt_addbdy(pkt, physlinkid);
189         ret =
190             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
191         if (ret < 0) {
192                 pr_err("Could not transmit enum message\n");
193                 cfpkt_destroy(pkt);
194         }
195 }
196
197 int cfctrl_linkup_request(struct cflayer *layer,
198                            struct cfctrl_link_param *param,
199                            struct cflayer *user_layer)
200 {
201         struct cfctrl *cfctrl = container_obj(layer);
202         u32 tmp32;
203         u16 tmp16;
204         u8 tmp8;
205         struct cfctrl_request_info *req;
206         int ret;
207         char utility_name[16];
208         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
209         if (!pkt) {
210                 pr_warn("Out of memory\n");
211                 return -ENOMEM;
212         }
213         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
214         cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
215         cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
216         cfpkt_addbdy(pkt, param->endpoint & 0x03);
217
218         switch (param->linktype) {
219         case CFCTRL_SRV_VEI:
220                 break;
221         case CFCTRL_SRV_VIDEO:
222                 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
223                 break;
224         case CFCTRL_SRV_DBG:
225                 break;
226         case CFCTRL_SRV_DATAGRAM:
227                 tmp32 = cpu_to_le32(param->u.datagram.connid);
228                 cfpkt_add_body(pkt, &tmp32, 4);
229                 break;
230         case CFCTRL_SRV_RFM:
231                 /* Construct a frame, convert DatagramConnectionID to network
232                  * format long and copy it out...
233                  */
234                 tmp32 = cpu_to_le32(param->u.rfm.connid);
235                 cfpkt_add_body(pkt, &tmp32, 4);
236                 /* Add volume name, including zero termination... */
237                 cfpkt_add_body(pkt, param->u.rfm.volume,
238                                strlen(param->u.rfm.volume) + 1);
239                 break;
240         case CFCTRL_SRV_UTIL:
241                 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
242                 cfpkt_add_body(pkt, &tmp16, 2);
243                 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
244                 cfpkt_add_body(pkt, &tmp16, 2);
245                 memset(utility_name, 0, sizeof(utility_name));
246                 strncpy(utility_name, param->u.utility.name,
247                         UTILITY_NAME_LENGTH - 1);
248                 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
249                 tmp8 = param->u.utility.paramlen;
250                 cfpkt_add_body(pkt, &tmp8, 1);
251                 cfpkt_add_body(pkt, param->u.utility.params,
252                                param->u.utility.paramlen);
253                 break;
254         default:
255                 pr_warn("Request setup of bad link type = %d\n",
256                         param->linktype);
257                 return -EINVAL;
258         }
259         req = kzalloc(sizeof(*req), GFP_KERNEL);
260         if (!req) {
261                 pr_warn("Out of memory\n");
262                 return -ENOMEM;
263         }
264         req->client_layer = user_layer;
265         req->cmd = CFCTRL_CMD_LINK_SETUP;
266         req->param = *param;
267         cfctrl_insert_req(cfctrl, req);
268         init_info(cfpkt_info(pkt), cfctrl);
269         /*
270          * NOTE:Always send linkup and linkdown request on the same
271          *      device as the payload. Otherwise old queued up payload
272          *      might arrive with the newly allocated channel ID.
273          */
274         cfpkt_info(pkt)->dev_info->id = param->phyid;
275         ret =
276             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
277         if (ret < 0) {
278                 pr_err("Could not transmit linksetup request\n");
279                 cfpkt_destroy(pkt);
280                 return -ENODEV;
281         }
282         return 0;
283 }
284
285 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
286                                 struct cflayer *client)
287 {
288         int ret;
289         struct cfctrl *cfctrl = container_obj(layer);
290         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
291         if (!pkt) {
292                 pr_warn("Out of memory\n");
293                 return -ENOMEM;
294         }
295         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
296         cfpkt_addbdy(pkt, channelid);
297         init_info(cfpkt_info(pkt), cfctrl);
298         ret =
299             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
300         if (ret < 0) {
301                 pr_err("Could not transmit link-down request\n");
302                 cfpkt_destroy(pkt);
303         }
304         return ret;
305 }
306
307 void cfctrl_sleep_req(struct cflayer *layer)
308 {
309         int ret;
310         struct cfctrl *cfctrl = container_obj(layer);
311         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
312         if (!pkt) {
313                 pr_warn("Out of memory\n");
314                 return;
315         }
316         cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
317         init_info(cfpkt_info(pkt), cfctrl);
318         ret =
319             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
320         if (ret < 0)
321                 cfpkt_destroy(pkt);
322 }
323
324 void cfctrl_wake_req(struct cflayer *layer)
325 {
326         int ret;
327         struct cfctrl *cfctrl = container_obj(layer);
328         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
329         if (!pkt) {
330                 pr_warn("Out of memory\n");
331                 return;
332         }
333         cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
334         init_info(cfpkt_info(pkt), cfctrl);
335         ret =
336             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
337         if (ret < 0)
338                 cfpkt_destroy(pkt);
339 }
340
341 void cfctrl_getstartreason_req(struct cflayer *layer)
342 {
343         int ret;
344         struct cfctrl *cfctrl = container_obj(layer);
345         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
346         if (!pkt) {
347                 pr_warn("Out of memory\n");
348                 return;
349         }
350         cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
351         init_info(cfpkt_info(pkt), cfctrl);
352         ret =
353             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
354         if (ret < 0)
355                 cfpkt_destroy(pkt);
356 }
357
358
359 void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
360 {
361         struct cfctrl_request_info *p, *tmp;
362         struct cfctrl *ctrl = container_obj(layr);
363         spin_lock(&ctrl->info_list_lock);
364
365         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
366                 if (p->client_layer == adap_layer) {
367                         pr_debug("cancel req :%d\n", p->sequence_no);
368                         list_del(&p->list);
369                         kfree(p);
370                 }
371         }
372
373         spin_unlock(&ctrl->info_list_lock);
374 }
375
376 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
377 {
378         u8 cmdrsp;
379         u8 cmd;
380         int ret = -1;
381         u16 tmp16;
382         u8 len;
383         u8 param[255];
384         u8 linkid;
385         struct cfctrl *cfctrl = container_obj(layer);
386         struct cfctrl_request_info rsp, *req;
387
388
389         cfpkt_extr_head(pkt, &cmdrsp, 1);
390         cmd = cmdrsp & CFCTRL_CMD_MASK;
391         if (cmd != CFCTRL_CMD_LINK_ERR
392             && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
393                 if (handle_loop(cfctrl, cmd, pkt) != 0)
394                         cmdrsp |= CFCTRL_ERR_BIT;
395         }
396
397         switch (cmd) {
398         case CFCTRL_CMD_LINK_SETUP:
399                 {
400                         enum cfctrl_srv serv;
401                         enum cfctrl_srv servtype;
402                         u8 endpoint;
403                         u8 physlinkid;
404                         u8 prio;
405                         u8 tmp;
406                         u32 tmp32;
407                         u8 *cp;
408                         int i;
409                         struct cfctrl_link_param linkparam;
410                         memset(&linkparam, 0, sizeof(linkparam));
411
412                         cfpkt_extr_head(pkt, &tmp, 1);
413
414                         serv = tmp & CFCTRL_SRV_MASK;
415                         linkparam.linktype = serv;
416
417                         servtype = tmp >> 4;
418                         linkparam.chtype = servtype;
419
420                         cfpkt_extr_head(pkt, &tmp, 1);
421                         physlinkid = tmp & 0x07;
422                         prio = tmp >> 3;
423
424                         linkparam.priority = prio;
425                         linkparam.phyid = physlinkid;
426                         cfpkt_extr_head(pkt, &endpoint, 1);
427                         linkparam.endpoint = endpoint & 0x03;
428
429                         switch (serv) {
430                         case CFCTRL_SRV_VEI:
431                         case CFCTRL_SRV_DBG:
432                                 if (CFCTRL_ERR_BIT & cmdrsp)
433                                         break;
434                                 /* Link ID */
435                                 cfpkt_extr_head(pkt, &linkid, 1);
436                                 break;
437                         case CFCTRL_SRV_VIDEO:
438                                 cfpkt_extr_head(pkt, &tmp, 1);
439                                 linkparam.u.video.connid = tmp;
440                                 if (CFCTRL_ERR_BIT & cmdrsp)
441                                         break;
442                                 /* Link ID */
443                                 cfpkt_extr_head(pkt, &linkid, 1);
444                                 break;
445
446                         case CFCTRL_SRV_DATAGRAM:
447                                 cfpkt_extr_head(pkt, &tmp32, 4);
448                                 linkparam.u.datagram.connid =
449                                     le32_to_cpu(tmp32);
450                                 if (CFCTRL_ERR_BIT & cmdrsp)
451                                         break;
452                                 /* Link ID */
453                                 cfpkt_extr_head(pkt, &linkid, 1);
454                                 break;
455                         case CFCTRL_SRV_RFM:
456                                 /* Construct a frame, convert
457                                  * DatagramConnectionID
458                                  * to network format long and copy it out...
459                                  */
460                                 cfpkt_extr_head(pkt, &tmp32, 4);
461                                 linkparam.u.rfm.connid =
462                                   le32_to_cpu(tmp32);
463                                 cp = (u8 *) linkparam.u.rfm.volume;
464                                 for (cfpkt_extr_head(pkt, &tmp, 1);
465                                      cfpkt_more(pkt) && tmp != '\0';
466                                      cfpkt_extr_head(pkt, &tmp, 1))
467                                         *cp++ = tmp;
468                                 *cp = '\0';
469
470                                 if (CFCTRL_ERR_BIT & cmdrsp)
471                                         break;
472                                 /* Link ID */
473                                 cfpkt_extr_head(pkt, &linkid, 1);
474
475                                 break;
476                         case CFCTRL_SRV_UTIL:
477                                 /* Construct a frame, convert
478                                  * DatagramConnectionID
479                                  * to network format long and copy it out...
480                                  */
481                                 /* Fifosize KB */
482                                 cfpkt_extr_head(pkt, &tmp16, 2);
483                                 linkparam.u.utility.fifosize_kb =
484                                     le16_to_cpu(tmp16);
485                                 /* Fifosize bufs */
486                                 cfpkt_extr_head(pkt, &tmp16, 2);
487                                 linkparam.u.utility.fifosize_bufs =
488                                     le16_to_cpu(tmp16);
489                                 /* name */
490                                 cp = (u8 *) linkparam.u.utility.name;
491                                 caif_assert(sizeof(linkparam.u.utility.name)
492                                              >= UTILITY_NAME_LENGTH);
493                                 for (i = 0;
494                                      i < UTILITY_NAME_LENGTH
495                                      && cfpkt_more(pkt); i++) {
496                                         cfpkt_extr_head(pkt, &tmp, 1);
497                                         *cp++ = tmp;
498                                 }
499                                 /* Length */
500                                 cfpkt_extr_head(pkt, &len, 1);
501                                 linkparam.u.utility.paramlen = len;
502                                 /* Param Data */
503                                 cp = linkparam.u.utility.params;
504                                 while (cfpkt_more(pkt) && len--) {
505                                         cfpkt_extr_head(pkt, &tmp, 1);
506                                         *cp++ = tmp;
507                                 }
508                                 if (CFCTRL_ERR_BIT & cmdrsp)
509                                         break;
510                                 /* Link ID */
511                                 cfpkt_extr_head(pkt, &linkid, 1);
512                                 /* Length */
513                                 cfpkt_extr_head(pkt, &len, 1);
514                                 /* Param Data */
515                                 cfpkt_extr_head(pkt, &param, len);
516                                 break;
517                         default:
518                                 pr_warn("Request setup - invalid link type (%d)\n",
519                                         serv);
520                                 goto error;
521                         }
522
523                         rsp.cmd = cmd;
524                         rsp.param = linkparam;
525                         req = cfctrl_remove_req(cfctrl, &rsp);
526
527                         if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
528                                 cfpkt_erroneous(pkt)) {
529                                 pr_err("Invalid O/E bit or parse error on CAIF control channel\n");
530                                 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
531                                                        0,
532                                                        req ? req->client_layer
533                                                        : NULL);
534                         } else {
535                                 cfctrl->res.linksetup_rsp(cfctrl->serv.
536                                                           layer.up, linkid,
537                                                           serv, physlinkid,
538                                                           req ? req->
539                                                           client_layer : NULL);
540                         }
541
542                         if (req != NULL)
543                                 kfree(req);
544                 }
545                 break;
546         case CFCTRL_CMD_LINK_DESTROY:
547                 cfpkt_extr_head(pkt, &linkid, 1);
548                 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
549                 break;
550         case CFCTRL_CMD_LINK_ERR:
551                 pr_err("Frame Error Indication received\n");
552                 cfctrl->res.linkerror_ind();
553                 break;
554         case CFCTRL_CMD_ENUM:
555                 cfctrl->res.enum_rsp();
556                 break;
557         case CFCTRL_CMD_SLEEP:
558                 cfctrl->res.sleep_rsp();
559                 break;
560         case CFCTRL_CMD_WAKE:
561                 cfctrl->res.wake_rsp();
562                 break;
563         case CFCTRL_CMD_LINK_RECONF:
564                 cfctrl->res.restart_rsp();
565                 break;
566         case CFCTRL_CMD_RADIO_SET:
567                 cfctrl->res.radioset_rsp();
568                 break;
569         default:
570                 pr_err("Unrecognized Control Frame\n");
571                 goto error;
572                 break;
573         }
574         ret = 0;
575 error:
576         cfpkt_destroy(pkt);
577         return ret;
578 }
579
580 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
581                         int phyid)
582 {
583         struct cfctrl *this = container_obj(layr);
584         switch (ctrl) {
585         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
586         case CAIF_CTRLCMD_FLOW_OFF_IND:
587                 spin_lock(&this->info_list_lock);
588                 if (!list_empty(&this->list)) {
589                         pr_debug("Received flow off in control layer\n");
590                 }
591                 spin_unlock(&this->info_list_lock);
592                 break;
593         default:
594                 break;
595         }
596 }
597
598 #ifndef CAIF_NO_LOOP
599 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
600 {
601         static int last_linkid;
602         u8 linkid, linktype, tmp;
603         switch (cmd) {
604         case CFCTRL_CMD_LINK_SETUP:
605                 spin_lock(&ctrl->loop_linkid_lock);
606                 for (linkid = last_linkid + 1; linkid < 255; linkid++)
607                         if (!ctrl->loop_linkused[linkid])
608                                 goto found;
609                 for (linkid = last_linkid - 1; linkid > 0; linkid--)
610                         if (!ctrl->loop_linkused[linkid])
611                                 goto found;
612                 spin_unlock(&ctrl->loop_linkid_lock);
613                 pr_err("Out of link-ids\n");
614                 return -EINVAL;
615 found:
616                 if (!ctrl->loop_linkused[linkid])
617                         ctrl->loop_linkused[linkid] = 1;
618
619                 last_linkid = linkid;
620
621                 cfpkt_add_trail(pkt, &linkid, 1);
622                 spin_unlock(&ctrl->loop_linkid_lock);
623                 cfpkt_peek_head(pkt, &linktype, 1);
624                 if (linktype ==  CFCTRL_SRV_UTIL) {
625                         tmp = 0x01;
626                         cfpkt_add_trail(pkt, &tmp, 1);
627                         cfpkt_add_trail(pkt, &tmp, 1);
628                 }
629                 break;
630
631         case CFCTRL_CMD_LINK_DESTROY:
632                 spin_lock(&ctrl->loop_linkid_lock);
633                 cfpkt_peek_head(pkt, &linkid, 1);
634                 ctrl->loop_linkused[linkid] = 0;
635                 spin_unlock(&ctrl->loop_linkid_lock);
636                 break;
637         default:
638                 break;
639         }
640         return 0;
641 }
642 #endif