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TOMOYO Linux Cross Reference
Linux/net/caif/cfctrl.c

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  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 <linux/pkt_sched.h>
 13 #include <net/caif/caif_layer.h>
 14 #include <net/caif/cfpkt.h>
 15 #include <net/caif/cfctrl.h>
 16 
 17 #define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
 18 #define UTILITY_NAME_LENGTH 16
 19 #define CFPKT_CTRL_PKT_LEN 20
 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                 kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
 40         if (!this)
 41                 return NULL;
 42         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
 43         memset(&dev_info, 0, sizeof(dev_info));
 44         dev_info.id = 0xff;
 45         cfsrvl_init(&this->serv, 0, &dev_info, false);
 46         atomic_set(&this->req_seq_no, 1);
 47         atomic_set(&this->rsp_seq_no, 1);
 48         this->serv.layer.receive = cfctrl_recv;
 49         sprintf(this->serv.layer.name, "ctrl");
 50         this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
 51 #ifndef CAIF_NO_LOOP
 52         spin_lock_init(&this->loop_linkid_lock);
 53         this->loop_linkid = 1;
 54 #endif
 55         spin_lock_init(&this->info_list_lock);
 56         INIT_LIST_HEAD(&this->list);
 57         return &this->serv.layer;
 58 }
 59 
 60 void cfctrl_remove(struct cflayer *layer)
 61 {
 62         struct cfctrl_request_info *p, *tmp;
 63         struct cfctrl *ctrl = container_obj(layer);
 64 
 65         spin_lock_bh(&ctrl->info_list_lock);
 66         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
 67                 list_del(&p->list);
 68                 kfree(p);
 69         }
 70         spin_unlock_bh(&ctrl->info_list_lock);
 71         kfree(layer);
 72 }
 73 
 74 static bool param_eq(const struct cfctrl_link_param *p1,
 75                         const struct cfctrl_link_param *p2)
 76 {
 77         bool eq =
 78             p1->linktype == p2->linktype &&
 79             p1->priority == p2->priority &&
 80             p1->phyid == p2->phyid &&
 81             p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
 82 
 83         if (!eq)
 84                 return false;
 85 
 86         switch (p1->linktype) {
 87         case CFCTRL_SRV_VEI:
 88                 return true;
 89         case CFCTRL_SRV_DATAGRAM:
 90                 return p1->u.datagram.connid == p2->u.datagram.connid;
 91         case CFCTRL_SRV_RFM:
 92                 return
 93                     p1->u.rfm.connid == p2->u.rfm.connid &&
 94                     strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
 95         case CFCTRL_SRV_UTIL:
 96                 return
 97                     p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
 98                     && p1->u.utility.fifosize_bufs ==
 99                     p2->u.utility.fifosize_bufs
100                     && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
101                     && p1->u.utility.paramlen == p2->u.utility.paramlen
102                     && memcmp(p1->u.utility.params, p2->u.utility.params,
103                               p1->u.utility.paramlen) == 0;
104 
105         case CFCTRL_SRV_VIDEO:
106                 return p1->u.video.connid == p2->u.video.connid;
107         case CFCTRL_SRV_DBG:
108                 return true;
109         case CFCTRL_SRV_DECM:
110                 return false;
111         default:
112                 return false;
113         }
114         return false;
115 }
116 
117 static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
118                           const struct cfctrl_request_info *r2)
119 {
120         if (r1->cmd != r2->cmd)
121                 return false;
122         if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
123                 return param_eq(&r1->param, &r2->param);
124         else
125                 return r1->channel_id == r2->channel_id;
126 }
127 
128 /* Insert request at the end */
129 static void cfctrl_insert_req(struct cfctrl *ctrl,
130                               struct cfctrl_request_info *req)
131 {
132         spin_lock_bh(&ctrl->info_list_lock);
133         atomic_inc(&ctrl->req_seq_no);
134         req->sequence_no = atomic_read(&ctrl->req_seq_no);
135         list_add_tail(&req->list, &ctrl->list);
136         spin_unlock_bh(&ctrl->info_list_lock);
137 }
138 
139 /* Compare and remove request */
140 static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
141                                                 struct cfctrl_request_info *req)
142 {
143         struct cfctrl_request_info *p, *tmp, *first;
144 
145         first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
146 
147         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
148                 if (cfctrl_req_eq(req, p)) {
149                         if (p != first)
150                                 pr_warn("Requests are not received in order\n");
151 
152                         atomic_set(&ctrl->rsp_seq_no,
153                                          p->sequence_no);
154                         list_del(&p->list);
155                         goto out;
156                 }
157         }
158         p = NULL;
159 out:
160         return p;
161 }
162 
163 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
164 {
165         struct cfctrl *this = container_obj(layer);
166         return &this->res;
167 }
168 
169 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
170 {
171         info->hdr_len = 0;
172         info->channel_id = cfctrl->serv.layer.id;
173         info->dev_info = &cfctrl->serv.dev_info;
174 }
175 
176 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
177 {
178         struct cfpkt *pkt;
179         struct cfctrl *cfctrl = container_obj(layer);
180         struct cflayer *dn = cfctrl->serv.layer.dn;
181 
182         if (!dn) {
183                 pr_debug("not able to send enum request\n");
184                 return;
185         }
186         pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
187         if (!pkt)
188                 return;
189         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
190         init_info(cfpkt_info(pkt), cfctrl);
191         cfpkt_info(pkt)->dev_info->id = physlinkid;
192         cfctrl->serv.dev_info.id = physlinkid;
193         cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
194         cfpkt_addbdy(pkt, physlinkid);
195         cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
196         dn->transmit(dn, pkt);
197 }
198 
199 int cfctrl_linkup_request(struct cflayer *layer,
200                            struct cfctrl_link_param *param,
201                            struct cflayer *user_layer)
202 {
203         struct cfctrl *cfctrl = container_obj(layer);
204         u32 tmp32;
205         u16 tmp16;
206         u8 tmp8;
207         struct cfctrl_request_info *req;
208         int ret;
209         char utility_name[16];
210         struct cfpkt *pkt;
211         struct cflayer *dn = cfctrl->serv.layer.dn;
212 
213         if (!dn) {
214                 pr_debug("not able to send linkup request\n");
215                 return -ENODEV;
216         }
217 
218         if (cfctrl_cancel_req(layer, user_layer) > 0) {
219                 /* Slight Paranoia, check if already connecting */
220                 pr_err("Duplicate connect request for same client\n");
221                 WARN_ON(1);
222                 return -EALREADY;
223         }
224 
225         pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
226         if (!pkt)
227                 return -ENOMEM;
228         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
229         cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
230         cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
231         cfpkt_addbdy(pkt, param->endpoint & 0x03);
232 
233         switch (param->linktype) {
234         case CFCTRL_SRV_VEI:
235                 break;
236         case CFCTRL_SRV_VIDEO:
237                 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
238                 break;
239         case CFCTRL_SRV_DBG:
240                 break;
241         case CFCTRL_SRV_DATAGRAM:
242                 tmp32 = cpu_to_le32(param->u.datagram.connid);
243                 cfpkt_add_body(pkt, &tmp32, 4);
244                 break;
245         case CFCTRL_SRV_RFM:
246                 /* Construct a frame, convert DatagramConnectionID to network
247                  * format long and copy it out...
248                  */
249                 tmp32 = cpu_to_le32(param->u.rfm.connid);
250                 cfpkt_add_body(pkt, &tmp32, 4);
251                 /* Add volume name, including zero termination... */
252                 cfpkt_add_body(pkt, param->u.rfm.volume,
253                                strlen(param->u.rfm.volume) + 1);
254                 break;
255         case CFCTRL_SRV_UTIL:
256                 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
257                 cfpkt_add_body(pkt, &tmp16, 2);
258                 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
259                 cfpkt_add_body(pkt, &tmp16, 2);
260                 memset(utility_name, 0, sizeof(utility_name));
261                 strncpy(utility_name, param->u.utility.name,
262                         UTILITY_NAME_LENGTH - 1);
263                 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
264                 tmp8 = param->u.utility.paramlen;
265                 cfpkt_add_body(pkt, &tmp8, 1);
266                 cfpkt_add_body(pkt, param->u.utility.params,
267                                param->u.utility.paramlen);
268                 break;
269         default:
270                 pr_warn("Request setup of bad link type = %d\n",
271                         param->linktype);
272                 return -EINVAL;
273         }
274         req = kzalloc(sizeof(*req), GFP_KERNEL);
275         if (!req)
276                 return -ENOMEM;
277         req->client_layer = user_layer;
278         req->cmd = CFCTRL_CMD_LINK_SETUP;
279         req->param = *param;
280         cfctrl_insert_req(cfctrl, req);
281         init_info(cfpkt_info(pkt), cfctrl);
282         /*
283          * NOTE:Always send linkup and linkdown request on the same
284          *      device as the payload. Otherwise old queued up payload
285          *      might arrive with the newly allocated channel ID.
286          */
287         cfpkt_info(pkt)->dev_info->id = param->phyid;
288         cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
289         ret =
290             dn->transmit(dn, pkt);
291         if (ret < 0) {
292                 int count;
293 
294                 count = cfctrl_cancel_req(&cfctrl->serv.layer,
295                                                 user_layer);
296                 if (count != 1)
297                         pr_err("Could not remove request (%d)", count);
298                         return -ENODEV;
299         }
300         return 0;
301 }
302 
303 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
304                                 struct cflayer *client)
305 {
306         int ret;
307         struct cfpkt *pkt;
308         struct cfctrl *cfctrl = container_obj(layer);
309         struct cflayer *dn = cfctrl->serv.layer.dn;
310 
311         if (!dn) {
312                 pr_debug("not able to send link-down request\n");
313                 return -ENODEV;
314         }
315         pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
316         if (!pkt)
317                 return -ENOMEM;
318         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
319         cfpkt_addbdy(pkt, channelid);
320         init_info(cfpkt_info(pkt), cfctrl);
321         cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
322         ret =
323             dn->transmit(dn, pkt);
324 #ifndef CAIF_NO_LOOP
325         cfctrl->loop_linkused[channelid] = 0;
326 #endif
327         return ret;
328 }
329 
330 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
331 {
332         struct cfctrl_request_info *p, *tmp;
333         struct cfctrl *ctrl = container_obj(layr);
334         int found = 0;
335         spin_lock_bh(&ctrl->info_list_lock);
336 
337         list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
338                 if (p->client_layer == adap_layer) {
339                         list_del(&p->list);
340                         kfree(p);
341                         found++;
342                 }
343         }
344 
345         spin_unlock_bh(&ctrl->info_list_lock);
346         return found;
347 }
348 
349 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
350 {
351         u8 cmdrsp;
352         u8 cmd;
353         int ret = -1;
354         u16 tmp16;
355         u8 len;
356         u8 param[255];
357         u8 linkid;
358         struct cfctrl *cfctrl = container_obj(layer);
359         struct cfctrl_request_info rsp, *req;
360 
361 
362         cfpkt_extr_head(pkt, &cmdrsp, 1);
363         cmd = cmdrsp & CFCTRL_CMD_MASK;
364         if (cmd != CFCTRL_CMD_LINK_ERR
365             && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
366                 && CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
367                 if (handle_loop(cfctrl, cmd, pkt) != 0)
368                         cmdrsp |= CFCTRL_ERR_BIT;
369         }
370 
371         switch (cmd) {
372         case CFCTRL_CMD_LINK_SETUP:
373                 {
374                         enum cfctrl_srv serv;
375                         enum cfctrl_srv servtype;
376                         u8 endpoint;
377                         u8 physlinkid;
378                         u8 prio;
379                         u8 tmp;
380                         u32 tmp32;
381                         u8 *cp;
382                         int i;
383                         struct cfctrl_link_param linkparam;
384                         memset(&linkparam, 0, sizeof(linkparam));
385 
386                         cfpkt_extr_head(pkt, &tmp, 1);
387 
388                         serv = tmp & CFCTRL_SRV_MASK;
389                         linkparam.linktype = serv;
390 
391                         servtype = tmp >> 4;
392                         linkparam.chtype = servtype;
393 
394                         cfpkt_extr_head(pkt, &tmp, 1);
395                         physlinkid = tmp & 0x07;
396                         prio = tmp >> 3;
397 
398                         linkparam.priority = prio;
399                         linkparam.phyid = physlinkid;
400                         cfpkt_extr_head(pkt, &endpoint, 1);
401                         linkparam.endpoint = endpoint & 0x03;
402 
403                         switch (serv) {
404                         case CFCTRL_SRV_VEI:
405                         case CFCTRL_SRV_DBG:
406                                 if (CFCTRL_ERR_BIT & cmdrsp)
407                                         break;
408                                 /* Link ID */
409                                 cfpkt_extr_head(pkt, &linkid, 1);
410                                 break;
411                         case CFCTRL_SRV_VIDEO:
412                                 cfpkt_extr_head(pkt, &tmp, 1);
413                                 linkparam.u.video.connid = tmp;
414                                 if (CFCTRL_ERR_BIT & cmdrsp)
415                                         break;
416                                 /* Link ID */
417                                 cfpkt_extr_head(pkt, &linkid, 1);
418                                 break;
419 
420                         case CFCTRL_SRV_DATAGRAM:
421                                 cfpkt_extr_head(pkt, &tmp32, 4);
422                                 linkparam.u.datagram.connid =
423                                     le32_to_cpu(tmp32);
424                                 if (CFCTRL_ERR_BIT & cmdrsp)
425                                         break;
426                                 /* Link ID */
427                                 cfpkt_extr_head(pkt, &linkid, 1);
428                                 break;
429                         case CFCTRL_SRV_RFM:
430                                 /* Construct a frame, convert
431                                  * DatagramConnectionID
432                                  * to network format long and copy it out...
433                                  */
434                                 cfpkt_extr_head(pkt, &tmp32, 4);
435                                 linkparam.u.rfm.connid =
436                                   le32_to_cpu(tmp32);
437                                 cp = (u8 *) linkparam.u.rfm.volume;
438                                 for (cfpkt_extr_head(pkt, &tmp, 1);
439                                      cfpkt_more(pkt) && tmp != '\0';
440                                      cfpkt_extr_head(pkt, &tmp, 1))
441                                         *cp++ = tmp;
442                                 *cp = '\0';
443 
444                                 if (CFCTRL_ERR_BIT & cmdrsp)
445                                         break;
446                                 /* Link ID */
447                                 cfpkt_extr_head(pkt, &linkid, 1);
448 
449                                 break;
450                         case CFCTRL_SRV_UTIL:
451                                 /* Construct a frame, convert
452                                  * DatagramConnectionID
453                                  * to network format long and copy it out...
454                                  */
455                                 /* Fifosize KB */
456                                 cfpkt_extr_head(pkt, &tmp16, 2);
457                                 linkparam.u.utility.fifosize_kb =
458                                     le16_to_cpu(tmp16);
459                                 /* Fifosize bufs */
460                                 cfpkt_extr_head(pkt, &tmp16, 2);
461                                 linkparam.u.utility.fifosize_bufs =
462                                     le16_to_cpu(tmp16);
463                                 /* name */
464                                 cp = (u8 *) linkparam.u.utility.name;
465                                 caif_assert(sizeof(linkparam.u.utility.name)
466                                              >= UTILITY_NAME_LENGTH);
467                                 for (i = 0;
468                                      i < UTILITY_NAME_LENGTH
469                                      && cfpkt_more(pkt); i++) {
470                                         cfpkt_extr_head(pkt, &tmp, 1);
471                                         *cp++ = tmp;
472                                 }
473                                 /* Length */
474                                 cfpkt_extr_head(pkt, &len, 1);
475                                 linkparam.u.utility.paramlen = len;
476                                 /* Param Data */
477                                 cp = linkparam.u.utility.params;
478                                 while (cfpkt_more(pkt) && len--) {
479                                         cfpkt_extr_head(pkt, &tmp, 1);
480                                         *cp++ = tmp;
481                                 }
482                                 if (CFCTRL_ERR_BIT & cmdrsp)
483                                         break;
484                                 /* Link ID */
485                                 cfpkt_extr_head(pkt, &linkid, 1);
486                                 /* Length */
487                                 cfpkt_extr_head(pkt, &len, 1);
488                                 /* Param Data */
489                                 cfpkt_extr_head(pkt, &param, len);
490                                 break;
491                         default:
492                                 pr_warn("Request setup, invalid type (%d)\n",
493                                         serv);
494                                 goto error;
495                         }
496 
497                         rsp.cmd = cmd;
498                         rsp.param = linkparam;
499                         spin_lock_bh(&cfctrl->info_list_lock);
500                         req = cfctrl_remove_req(cfctrl, &rsp);
501 
502                         if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
503                                 cfpkt_erroneous(pkt)) {
504                                 pr_err("Invalid O/E bit or parse error "
505                                                 "on CAIF control channel\n");
506                                 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
507                                                        0,
508                                                        req ? req->client_layer
509                                                        : NULL);
510                         } else {
511                                 cfctrl->res.linksetup_rsp(cfctrl->serv.
512                                                           layer.up, linkid,
513                                                           serv, physlinkid,
514                                                           req ? req->
515                                                           client_layer : NULL);
516                         }
517 
518                         kfree(req);
519 
520                         spin_unlock_bh(&cfctrl->info_list_lock);
521                 }
522                 break;
523         case CFCTRL_CMD_LINK_DESTROY:
524                 cfpkt_extr_head(pkt, &linkid, 1);
525                 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
526                 break;
527         case CFCTRL_CMD_LINK_ERR:
528                 pr_err("Frame Error Indication received\n");
529                 cfctrl->res.linkerror_ind();
530                 break;
531         case CFCTRL_CMD_ENUM:
532                 cfctrl->res.enum_rsp();
533                 break;
534         case CFCTRL_CMD_SLEEP:
535                 cfctrl->res.sleep_rsp();
536                 break;
537         case CFCTRL_CMD_WAKE:
538                 cfctrl->res.wake_rsp();
539                 break;
540         case CFCTRL_CMD_LINK_RECONF:
541                 cfctrl->res.restart_rsp();
542                 break;
543         case CFCTRL_CMD_RADIO_SET:
544                 cfctrl->res.radioset_rsp();
545                 break;
546         default:
547                 pr_err("Unrecognized Control Frame\n");
548                 goto error;
549                 break;
550         }
551         ret = 0;
552 error:
553         cfpkt_destroy(pkt);
554         return ret;
555 }
556 
557 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
558                         int phyid)
559 {
560         struct cfctrl *this = container_obj(layr);
561         switch (ctrl) {
562         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
563         case CAIF_CTRLCMD_FLOW_OFF_IND:
564                 spin_lock_bh(&this->info_list_lock);
565                 if (!list_empty(&this->list))
566                         pr_debug("Received flow off in control layer\n");
567                 spin_unlock_bh(&this->info_list_lock);
568                 break;
569         case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
570                 struct cfctrl_request_info *p, *tmp;
571 
572                 /* Find all connect request and report failure */
573                 spin_lock_bh(&this->info_list_lock);
574                 list_for_each_entry_safe(p, tmp, &this->list, list) {
575                         if (p->param.phyid == phyid) {
576                                 list_del(&p->list);
577                                 p->client_layer->ctrlcmd(p->client_layer,
578                                                 CAIF_CTRLCMD_INIT_FAIL_RSP,
579                                                 phyid);
580                                 kfree(p);
581                         }
582                 }
583                 spin_unlock_bh(&this->info_list_lock);
584                 break;
585         }
586         default:
587                 break;
588         }
589 }
590 
591 #ifndef CAIF_NO_LOOP
592 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
593 {
594         static int last_linkid;
595         static int dec;
596         u8 linkid, linktype, tmp;
597         switch (cmd) {
598         case CFCTRL_CMD_LINK_SETUP:
599                 spin_lock_bh(&ctrl->loop_linkid_lock);
600                 if (!dec) {
601                         for (linkid = last_linkid + 1; linkid < 254; linkid++)
602                                 if (!ctrl->loop_linkused[linkid])
603                                         goto found;
604                 }
605                 dec = 1;
606                 for (linkid = last_linkid - 1; linkid > 1; linkid--)
607                         if (!ctrl->loop_linkused[linkid])
608                                 goto found;
609                 spin_unlock_bh(&ctrl->loop_linkid_lock);
610                 return -1;
611 found:
612                 if (linkid < 10)
613                         dec = 0;
614 
615                 if (!ctrl->loop_linkused[linkid])
616                         ctrl->loop_linkused[linkid] = 1;
617 
618                 last_linkid = linkid;
619 
620                 cfpkt_add_trail(pkt, &linkid, 1);
621                 spin_unlock_bh(&ctrl->loop_linkid_lock);
622                 cfpkt_peek_head(pkt, &linktype, 1);
623                 if (linktype ==  CFCTRL_SRV_UTIL) {
624                         tmp = 0x01;
625                         cfpkt_add_trail(pkt, &tmp, 1);
626                         cfpkt_add_trail(pkt, &tmp, 1);
627                 }
628                 break;
629 
630         case CFCTRL_CMD_LINK_DESTROY:
631                 spin_lock_bh(&ctrl->loop_linkid_lock);
632                 cfpkt_peek_head(pkt, &linkid, 1);
633                 ctrl->loop_linkused[linkid] = 0;
634                 spin_unlock_bh(&ctrl->loop_linkid_lock);
635                 break;
636         default:
637                 break;
638         }
639         return 0;
640 }
641 #endif
642 

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