net/caif: Use pr_fmt
[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         pr_warn("enter\n");
365
366         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
367                 if (p->client_layer == adap_layer) {
368                         pr_warn("cancel req :%d\n", p->sequence_no);
369                         list_del(&p->list);
370                         kfree(p);
371                 }
372         }
373
374         spin_unlock(&ctrl->info_list_lock);
375 }
376
377 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
378 {
379         u8 cmdrsp;
380         u8 cmd;
381         int ret = -1;
382         u16 tmp16;
383         u8 len;
384         u8 param[255];
385         u8 linkid;
386         struct cfctrl *cfctrl = container_obj(layer);
387         struct cfctrl_request_info rsp, *req;
388
389
390         cfpkt_extr_head(pkt, &cmdrsp, 1);
391         cmd = cmdrsp & CFCTRL_CMD_MASK;
392         if (cmd != CFCTRL_CMD_LINK_ERR
393             && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
394                 if (handle_loop(cfctrl, cmd, pkt) != 0)
395                         cmdrsp |= CFCTRL_ERR_BIT;
396         }
397
398         switch (cmd) {
399         case CFCTRL_CMD_LINK_SETUP:
400                 {
401                         enum cfctrl_srv serv;
402                         enum cfctrl_srv servtype;
403                         u8 endpoint;
404                         u8 physlinkid;
405                         u8 prio;
406                         u8 tmp;
407                         u32 tmp32;
408                         u8 *cp;
409                         int i;
410                         struct cfctrl_link_param linkparam;
411                         memset(&linkparam, 0, sizeof(linkparam));
412
413                         cfpkt_extr_head(pkt, &tmp, 1);
414
415                         serv = tmp & CFCTRL_SRV_MASK;
416                         linkparam.linktype = serv;
417
418                         servtype = tmp >> 4;
419                         linkparam.chtype = servtype;
420
421                         cfpkt_extr_head(pkt, &tmp, 1);
422                         physlinkid = tmp & 0x07;
423                         prio = tmp >> 3;
424
425                         linkparam.priority = prio;
426                         linkparam.phyid = physlinkid;
427                         cfpkt_extr_head(pkt, &endpoint, 1);
428                         linkparam.endpoint = endpoint & 0x03;
429
430                         switch (serv) {
431                         case CFCTRL_SRV_VEI:
432                         case CFCTRL_SRV_DBG:
433                                 if (CFCTRL_ERR_BIT & cmdrsp)
434                                         break;
435                                 /* Link ID */
436                                 cfpkt_extr_head(pkt, &linkid, 1);
437                                 break;
438                         case CFCTRL_SRV_VIDEO:
439                                 cfpkt_extr_head(pkt, &tmp, 1);
440                                 linkparam.u.video.connid = tmp;
441                                 if (CFCTRL_ERR_BIT & cmdrsp)
442                                         break;
443                                 /* Link ID */
444                                 cfpkt_extr_head(pkt, &linkid, 1);
445                                 break;
446
447                         case CFCTRL_SRV_DATAGRAM:
448                                 cfpkt_extr_head(pkt, &tmp32, 4);
449                                 linkparam.u.datagram.connid =
450                                     le32_to_cpu(tmp32);
451                                 if (CFCTRL_ERR_BIT & cmdrsp)
452                                         break;
453                                 /* Link ID */
454                                 cfpkt_extr_head(pkt, &linkid, 1);
455                                 break;
456                         case CFCTRL_SRV_RFM:
457                                 /* Construct a frame, convert
458                                  * DatagramConnectionID
459                                  * to network format long and copy it out...
460                                  */
461                                 cfpkt_extr_head(pkt, &tmp32, 4);
462                                 linkparam.u.rfm.connid =
463                                   le32_to_cpu(tmp32);
464                                 cp = (u8 *) linkparam.u.rfm.volume;
465                                 for (cfpkt_extr_head(pkt, &tmp, 1);
466                                      cfpkt_more(pkt) && tmp != '\0';
467                                      cfpkt_extr_head(pkt, &tmp, 1))
468                                         *cp++ = tmp;
469                                 *cp = '\0';
470
471                                 if (CFCTRL_ERR_BIT & cmdrsp)
472                                         break;
473                                 /* Link ID */
474                                 cfpkt_extr_head(pkt, &linkid, 1);
475
476                                 break;
477                         case CFCTRL_SRV_UTIL:
478                                 /* Construct a frame, convert
479                                  * DatagramConnectionID
480                                  * to network format long and copy it out...
481                                  */
482                                 /* Fifosize KB */
483                                 cfpkt_extr_head(pkt, &tmp16, 2);
484                                 linkparam.u.utility.fifosize_kb =
485                                     le16_to_cpu(tmp16);
486                                 /* Fifosize bufs */
487                                 cfpkt_extr_head(pkt, &tmp16, 2);
488                                 linkparam.u.utility.fifosize_bufs =
489                                     le16_to_cpu(tmp16);
490                                 /* name */
491                                 cp = (u8 *) linkparam.u.utility.name;
492                                 caif_assert(sizeof(linkparam.u.utility.name)
493                                              >= UTILITY_NAME_LENGTH);
494                                 for (i = 0;
495                                      i < UTILITY_NAME_LENGTH
496                                      && cfpkt_more(pkt); i++) {
497                                         cfpkt_extr_head(pkt, &tmp, 1);
498                                         *cp++ = tmp;
499                                 }
500                                 /* Length */
501                                 cfpkt_extr_head(pkt, &len, 1);
502                                 linkparam.u.utility.paramlen = len;
503                                 /* Param Data */
504                                 cp = linkparam.u.utility.params;
505                                 while (cfpkt_more(pkt) && len--) {
506                                         cfpkt_extr_head(pkt, &tmp, 1);
507                                         *cp++ = tmp;
508                                 }
509                                 if (CFCTRL_ERR_BIT & cmdrsp)
510                                         break;
511                                 /* Link ID */
512                                 cfpkt_extr_head(pkt, &linkid, 1);
513                                 /* Length */
514                                 cfpkt_extr_head(pkt, &len, 1);
515                                 /* Param Data */
516                                 cfpkt_extr_head(pkt, &param, len);
517                                 break;
518                         default:
519                                 pr_warn("Request setup - invalid link type (%d)\n",
520                                         serv);
521                                 goto error;
522                         }
523
524                         rsp.cmd = cmd;
525                         rsp.param = linkparam;
526                         req = cfctrl_remove_req(cfctrl, &rsp);
527
528                         if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
529                                 cfpkt_erroneous(pkt)) {
530                                 pr_err("Invalid O/E bit or parse error on CAIF control channel\n");
531                                 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
532                                                        0,
533                                                        req ? req->client_layer
534                                                        : NULL);
535                         } else {
536                                 cfctrl->res.linksetup_rsp(cfctrl->serv.
537                                                           layer.up, linkid,
538                                                           serv, physlinkid,
539                                                           req ? req->
540                                                           client_layer : NULL);
541                         }
542
543                         if (req != NULL)
544                                 kfree(req);
545                 }
546                 break;
547         case CFCTRL_CMD_LINK_DESTROY:
548                 cfpkt_extr_head(pkt, &linkid, 1);
549                 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
550                 break;
551         case CFCTRL_CMD_LINK_ERR:
552                 pr_err("Frame Error Indication received\n");
553                 cfctrl->res.linkerror_ind();
554                 break;
555         case CFCTRL_CMD_ENUM:
556                 cfctrl->res.enum_rsp();
557                 break;
558         case CFCTRL_CMD_SLEEP:
559                 cfctrl->res.sleep_rsp();
560                 break;
561         case CFCTRL_CMD_WAKE:
562                 cfctrl->res.wake_rsp();
563                 break;
564         case CFCTRL_CMD_LINK_RECONF:
565                 cfctrl->res.restart_rsp();
566                 break;
567         case CFCTRL_CMD_RADIO_SET:
568                 cfctrl->res.radioset_rsp();
569                 break;
570         default:
571                 pr_err("Unrecognized Control Frame\n");
572                 goto error;
573                 break;
574         }
575         ret = 0;
576 error:
577         cfpkt_destroy(pkt);
578         return ret;
579 }
580
581 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
582                         int phyid)
583 {
584         struct cfctrl *this = container_obj(layr);
585         switch (ctrl) {
586         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
587         case CAIF_CTRLCMD_FLOW_OFF_IND:
588                 spin_lock(&this->info_list_lock);
589                 if (!list_empty(&this->list)) {
590                         pr_debug("Received flow off in control layer\n");
591                 }
592                 spin_unlock(&this->info_list_lock);
593                 break;
594         default:
595                 break;
596         }
597 }
598
599 #ifndef CAIF_NO_LOOP
600 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
601 {
602         static int last_linkid;
603         u8 linkid, linktype, tmp;
604         switch (cmd) {
605         case CFCTRL_CMD_LINK_SETUP:
606                 spin_lock(&ctrl->loop_linkid_lock);
607                 for (linkid = last_linkid + 1; linkid < 255; linkid++)
608                         if (!ctrl->loop_linkused[linkid])
609                                 goto found;
610                 for (linkid = last_linkid - 1; linkid > 0; linkid--)
611                         if (!ctrl->loop_linkused[linkid])
612                                 goto found;
613                 spin_unlock(&ctrl->loop_linkid_lock);
614                 pr_err("Out of link-ids\n");
615                 return -EINVAL;
616 found:
617                 if (!ctrl->loop_linkused[linkid])
618                         ctrl->loop_linkused[linkid] = 1;
619
620                 last_linkid = linkid;
621
622                 cfpkt_add_trail(pkt, &linkid, 1);
623                 spin_unlock(&ctrl->loop_linkid_lock);
624                 cfpkt_peek_head(pkt, &linktype, 1);
625                 if (linktype ==  CFCTRL_SRV_UTIL) {
626                         tmp = 0x01;
627                         cfpkt_add_trail(pkt, &tmp, 1);
628                         cfpkt_add_trail(pkt, &tmp, 1);
629                 }
630                 break;
631
632         case CFCTRL_CMD_LINK_DESTROY:
633                 spin_lock(&ctrl->loop_linkid_lock);
634                 cfpkt_peek_head(pkt, &linkid, 1);
635                 ctrl->loop_linkused[linkid] = 0;
636                 spin_unlock(&ctrl->loop_linkid_lock);
637                 break;
638         default:
639                 break;
640         }
641         return 0;
642 }
643 #endif