net/caif: Use kzalloc
[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 #include <linux/stddef.h>
8 #include <linux/spinlock.h>
9 #include <linux/slab.h>
10 #include <net/caif/caif_layer.h>
11 #include <net/caif/cfpkt.h>
12 #include <net/caif/cfctrl.h>
13
14 #define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
15 #define UTILITY_NAME_LENGTH 16
16 #define CFPKT_CTRL_PKT_LEN 20
17
18
19 #ifdef CAIF_NO_LOOP
20 static int handle_loop(struct cfctrl *ctrl,
21                               int cmd, struct cfpkt *pkt){
22         return CAIF_FAILURE;
23 }
24 #else
25 static int handle_loop(struct cfctrl *ctrl,
26                 int cmd, struct cfpkt *pkt);
27 #endif
28 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
29 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
30                            int phyid);
31
32
33 struct cflayer *cfctrl_create(void)
34 {
35         struct dev_info dev_info;
36         struct cfctrl *this =
37                 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
38         if (!this) {
39                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
40                 return NULL;
41         }
42         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
43         memset(&dev_info, 0, sizeof(dev_info));
44         dev_info.id = 0xff;
45         memset(this, 0, sizeof(*this));
46         cfsrvl_init(&this->serv, 0, &dev_info);
47         spin_lock_init(&this->info_list_lock);
48         atomic_set(&this->req_seq_no, 1);
49         atomic_set(&this->rsp_seq_no, 1);
50         this->serv.layer.receive = cfctrl_recv;
51         sprintf(this->serv.layer.name, "ctrl");
52         this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
53         spin_lock_init(&this->loop_linkid_lock);
54         this->loop_linkid = 1;
55         return &this->serv.layer;
56 }
57
58 static bool param_eq(struct cfctrl_link_param *p1, struct cfctrl_link_param *p2)
59 {
60         bool eq =
61             p1->linktype == p2->linktype &&
62             p1->priority == p2->priority &&
63             p1->phyid == p2->phyid &&
64             p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
65
66         if (!eq)
67                 return false;
68
69         switch (p1->linktype) {
70         case CFCTRL_SRV_VEI:
71                 return true;
72         case CFCTRL_SRV_DATAGRAM:
73                 return p1->u.datagram.connid == p2->u.datagram.connid;
74         case CFCTRL_SRV_RFM:
75                 return
76                     p1->u.rfm.connid == p2->u.rfm.connid &&
77                     strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
78         case CFCTRL_SRV_UTIL:
79                 return
80                     p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
81                     && p1->u.utility.fifosize_bufs ==
82                     p2->u.utility.fifosize_bufs
83                     && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
84                     && p1->u.utility.paramlen == p2->u.utility.paramlen
85                     && memcmp(p1->u.utility.params, p2->u.utility.params,
86                               p1->u.utility.paramlen) == 0;
87
88         case CFCTRL_SRV_VIDEO:
89                 return p1->u.video.connid == p2->u.video.connid;
90         case CFCTRL_SRV_DBG:
91                 return true;
92         case CFCTRL_SRV_DECM:
93                 return false;
94         default:
95                 return false;
96         }
97         return false;
98 }
99
100 bool cfctrl_req_eq(struct cfctrl_request_info *r1,
101                    struct cfctrl_request_info *r2)
102 {
103         if (r1->cmd != r2->cmd)
104                 return false;
105         if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
106                 return param_eq(&r1->param, &r2->param);
107         else
108                 return r1->channel_id == r2->channel_id;
109 }
110
111 /* Insert request at the end */
112 void cfctrl_insert_req(struct cfctrl *ctrl,
113                               struct cfctrl_request_info *req)
114 {
115         struct cfctrl_request_info *p;
116         spin_lock(&ctrl->info_list_lock);
117         req->next = NULL;
118         atomic_inc(&ctrl->req_seq_no);
119         req->sequence_no = atomic_read(&ctrl->req_seq_no);
120         if (ctrl->first_req == NULL) {
121                 ctrl->first_req = req;
122                 spin_unlock(&ctrl->info_list_lock);
123                 return;
124         }
125         p = ctrl->first_req;
126         while (p->next != NULL)
127                 p = p->next;
128         p->next = req;
129         spin_unlock(&ctrl->info_list_lock);
130 }
131
132 /* Compare and remove request */
133 struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
134                                               struct cfctrl_request_info *req)
135 {
136         struct cfctrl_request_info *p;
137         struct cfctrl_request_info *ret;
138
139         spin_lock(&ctrl->info_list_lock);
140         if (ctrl->first_req == NULL) {
141                 spin_unlock(&ctrl->info_list_lock);
142                 return NULL;
143         }
144
145         if (cfctrl_req_eq(req, ctrl->first_req)) {
146                 ret = ctrl->first_req;
147                 caif_assert(ctrl->first_req);
148                 atomic_set(&ctrl->rsp_seq_no,
149                                  ctrl->first_req->sequence_no);
150                 ctrl->first_req = ctrl->first_req->next;
151                 spin_unlock(&ctrl->info_list_lock);
152                 return ret;
153         }
154
155         p = ctrl->first_req;
156
157         while (p->next != NULL) {
158                 if (cfctrl_req_eq(req, p->next)) {
159                         pr_warning("CAIF: %s(): Requests are not "
160                                         "received in order\n",
161                                         __func__);
162                         ret = p->next;
163                         atomic_set(&ctrl->rsp_seq_no,
164                                         p->next->sequence_no);
165                         p->next = p->next->next;
166                         spin_unlock(&ctrl->info_list_lock);
167                         return ret;
168                 }
169                 p = p->next;
170         }
171         spin_unlock(&ctrl->info_list_lock);
172
173         pr_warning("CAIF: %s(): Request does not match\n",
174                    __func__);
175         return NULL;
176 }
177
178 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
179 {
180         struct cfctrl *this = container_obj(layer);
181         return &this->res;
182 }
183
184 void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
185 {
186         this->dn = dn;
187 }
188
189 void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
190 {
191         this->up = up;
192 }
193
194 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
195 {
196         info->hdr_len = 0;
197         info->channel_id = cfctrl->serv.layer.id;
198         info->dev_info = &cfctrl->serv.dev_info;
199 }
200
201 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
202 {
203         struct cfctrl *cfctrl = container_obj(layer);
204         int ret;
205         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
206         if (!pkt) {
207                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
208                 return;
209         }
210         caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
211         init_info(cfpkt_info(pkt), cfctrl);
212         cfpkt_info(pkt)->dev_info->id = physlinkid;
213         cfctrl->serv.dev_info.id = physlinkid;
214         cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
215         cfpkt_addbdy(pkt, physlinkid);
216         ret =
217             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
218         if (ret < 0) {
219                 pr_err("CAIF: %s(): Could not transmit enum message\n",
220                         __func__);
221                 cfpkt_destroy(pkt);
222         }
223 }
224
225 int cfctrl_linkup_request(struct cflayer *layer,
226                            struct cfctrl_link_param *param,
227                            struct cflayer *user_layer)
228 {
229         struct cfctrl *cfctrl = container_obj(layer);
230         u32 tmp32;
231         u16 tmp16;
232         u8 tmp8;
233         struct cfctrl_request_info *req;
234         int ret;
235         char utility_name[16];
236         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
237         if (!pkt) {
238                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
239                 return -ENOMEM;
240         }
241         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
242         cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
243         cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
244         cfpkt_addbdy(pkt, param->endpoint & 0x03);
245
246         switch (param->linktype) {
247         case CFCTRL_SRV_VEI:
248                 break;
249         case CFCTRL_SRV_VIDEO:
250                 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
251                 break;
252         case CFCTRL_SRV_DBG:
253                 break;
254         case CFCTRL_SRV_DATAGRAM:
255                 tmp32 = cpu_to_le32(param->u.datagram.connid);
256                 cfpkt_add_body(pkt, &tmp32, 4);
257                 break;
258         case CFCTRL_SRV_RFM:
259                 /* Construct a frame, convert DatagramConnectionID to network
260                  * format long and copy it out...
261                  */
262                 tmp32 = cpu_to_le32(param->u.rfm.connid);
263                 cfpkt_add_body(pkt, &tmp32, 4);
264                 /* Add volume name, including zero termination... */
265                 cfpkt_add_body(pkt, param->u.rfm.volume,
266                                strlen(param->u.rfm.volume) + 1);
267                 break;
268         case CFCTRL_SRV_UTIL:
269                 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
270                 cfpkt_add_body(pkt, &tmp16, 2);
271                 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
272                 cfpkt_add_body(pkt, &tmp16, 2);
273                 memset(utility_name, 0, sizeof(utility_name));
274                 strncpy(utility_name, param->u.utility.name,
275                         UTILITY_NAME_LENGTH - 1);
276                 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
277                 tmp8 = param->u.utility.paramlen;
278                 cfpkt_add_body(pkt, &tmp8, 1);
279                 cfpkt_add_body(pkt, param->u.utility.params,
280                                param->u.utility.paramlen);
281                 break;
282         default:
283                 pr_warning("CAIF: %s():Request setup of bad link type = %d\n",
284                            __func__, param->linktype);
285                 return -EINVAL;
286         }
287         req = kzalloc(sizeof(*req), GFP_KERNEL);
288         if (!req) {
289                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
290                 return -ENOMEM;
291         }
292         req->client_layer = user_layer;
293         req->cmd = CFCTRL_CMD_LINK_SETUP;
294         req->param = *param;
295         cfctrl_insert_req(cfctrl, req);
296         init_info(cfpkt_info(pkt), cfctrl);
297         /*
298          * NOTE:Always send linkup and linkdown request on the same
299          *      device as the payload. Otherwise old queued up payload
300          *      might arrive with the newly allocated channel ID.
301          */
302         cfpkt_info(pkt)->dev_info->id = param->phyid;
303         ret =
304             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
305         if (ret < 0) {
306                 pr_err("CAIF: %s(): Could not transmit linksetup request\n",
307                         __func__);
308                 cfpkt_destroy(pkt);
309                 return -ENODEV;
310         }
311         return 0;
312 }
313
314 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
315                                 struct cflayer *client)
316 {
317         int ret;
318         struct cfctrl *cfctrl = container_obj(layer);
319         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
320         if (!pkt) {
321                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
322                 return -ENOMEM;
323         }
324         cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
325         cfpkt_addbdy(pkt, channelid);
326         init_info(cfpkt_info(pkt), cfctrl);
327         ret =
328             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
329         if (ret < 0) {
330                 pr_err("CAIF: %s(): Could not transmit link-down request\n",
331                         __func__);
332                 cfpkt_destroy(pkt);
333         }
334         return ret;
335 }
336
337 void cfctrl_sleep_req(struct cflayer *layer)
338 {
339         int ret;
340         struct cfctrl *cfctrl = container_obj(layer);
341         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
342         if (!pkt) {
343                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
344                 return;
345         }
346         cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
347         init_info(cfpkt_info(pkt), cfctrl);
348         ret =
349             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
350         if (ret < 0)
351                 cfpkt_destroy(pkt);
352 }
353
354 void cfctrl_wake_req(struct cflayer *layer)
355 {
356         int ret;
357         struct cfctrl *cfctrl = container_obj(layer);
358         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
359         if (!pkt) {
360                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
361                 return;
362         }
363         cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
364         init_info(cfpkt_info(pkt), cfctrl);
365         ret =
366             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
367         if (ret < 0)
368                 cfpkt_destroy(pkt);
369 }
370
371 void cfctrl_getstartreason_req(struct cflayer *layer)
372 {
373         int ret;
374         struct cfctrl *cfctrl = container_obj(layer);
375         struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
376         if (!pkt) {
377                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
378                 return;
379         }
380         cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
381         init_info(cfpkt_info(pkt), cfctrl);
382         ret =
383             cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
384         if (ret < 0)
385                 cfpkt_destroy(pkt);
386 }
387
388
389 void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
390 {
391         struct cfctrl_request_info *p, *req;
392         struct cfctrl *ctrl = container_obj(layr);
393         spin_lock(&ctrl->info_list_lock);
394
395         if (ctrl->first_req == NULL) {
396                 spin_unlock(&ctrl->info_list_lock);
397                 return;
398         }
399
400         if (ctrl->first_req->client_layer == adap_layer) {
401
402                 req = ctrl->first_req;
403                 ctrl->first_req = ctrl->first_req->next;
404                 kfree(req);
405         }
406
407         p = ctrl->first_req;
408         while (p != NULL && p->next != NULL) {
409                 if (p->next->client_layer == adap_layer) {
410
411                         req = p->next;
412                         p->next = p->next->next;
413                         kfree(p->next);
414                 }
415                 p = p->next;
416         }
417
418         spin_unlock(&ctrl->info_list_lock);
419 }
420
421 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
422 {
423         u8 cmdrsp;
424         u8 cmd;
425         int ret = -1;
426         u16 tmp16;
427         u8 len;
428         u8 param[255];
429         u8 linkid;
430         struct cfctrl *cfctrl = container_obj(layer);
431         struct cfctrl_request_info rsp, *req;
432
433
434         cfpkt_extr_head(pkt, &cmdrsp, 1);
435         cmd = cmdrsp & CFCTRL_CMD_MASK;
436         if (cmd != CFCTRL_CMD_LINK_ERR
437             && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
438                 if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
439                         cmdrsp |= CFCTRL_ERR_BIT;
440         }
441
442         switch (cmd) {
443         case CFCTRL_CMD_LINK_SETUP:
444                 {
445                         enum cfctrl_srv serv;
446                         enum cfctrl_srv servtype;
447                         u8 endpoint;
448                         u8 physlinkid;
449                         u8 prio;
450                         u8 tmp;
451                         u32 tmp32;
452                         u8 *cp;
453                         int i;
454                         struct cfctrl_link_param linkparam;
455                         memset(&linkparam, 0, sizeof(linkparam));
456
457                         cfpkt_extr_head(pkt, &tmp, 1);
458
459                         serv = tmp & CFCTRL_SRV_MASK;
460                         linkparam.linktype = serv;
461
462                         servtype = tmp >> 4;
463                         linkparam.chtype = servtype;
464
465                         cfpkt_extr_head(pkt, &tmp, 1);
466                         physlinkid = tmp & 0x07;
467                         prio = tmp >> 3;
468
469                         linkparam.priority = prio;
470                         linkparam.phyid = physlinkid;
471                         cfpkt_extr_head(pkt, &endpoint, 1);
472                         linkparam.endpoint = endpoint & 0x03;
473
474                         switch (serv) {
475                         case CFCTRL_SRV_VEI:
476                         case CFCTRL_SRV_DBG:
477                                 if (CFCTRL_ERR_BIT & cmdrsp)
478                                         break;
479                                 /* Link ID */
480                                 cfpkt_extr_head(pkt, &linkid, 1);
481                                 break;
482                         case CFCTRL_SRV_VIDEO:
483                                 cfpkt_extr_head(pkt, &tmp, 1);
484                                 linkparam.u.video.connid = tmp;
485                                 if (CFCTRL_ERR_BIT & cmdrsp)
486                                         break;
487                                 /* Link ID */
488                                 cfpkt_extr_head(pkt, &linkid, 1);
489                                 break;
490
491                         case CFCTRL_SRV_DATAGRAM:
492                                 cfpkt_extr_head(pkt, &tmp32, 4);
493                                 linkparam.u.datagram.connid =
494                                     le32_to_cpu(tmp32);
495                                 if (CFCTRL_ERR_BIT & cmdrsp)
496                                         break;
497                                 /* Link ID */
498                                 cfpkt_extr_head(pkt, &linkid, 1);
499                                 break;
500                         case CFCTRL_SRV_RFM:
501                                 /* Construct a frame, convert
502                                  * DatagramConnectionID
503                                  * to network format long and copy it out...
504                                  */
505                                 cfpkt_extr_head(pkt, &tmp32, 4);
506                                 linkparam.u.rfm.connid =
507                                   le32_to_cpu(tmp32);
508                                 cp = (u8 *) linkparam.u.rfm.volume;
509                                 for (cfpkt_extr_head(pkt, &tmp, 1);
510                                      cfpkt_more(pkt) && tmp != '\0';
511                                      cfpkt_extr_head(pkt, &tmp, 1))
512                                         *cp++ = tmp;
513                                 *cp = '\0';
514
515                                 if (CFCTRL_ERR_BIT & cmdrsp)
516                                         break;
517                                 /* Link ID */
518                                 cfpkt_extr_head(pkt, &linkid, 1);
519
520                                 break;
521                         case CFCTRL_SRV_UTIL:
522                                 /* Construct a frame, convert
523                                  * DatagramConnectionID
524                                  * to network format long and copy it out...
525                                  */
526                                 /* Fifosize KB */
527                                 cfpkt_extr_head(pkt, &tmp16, 2);
528                                 linkparam.u.utility.fifosize_kb =
529                                     le16_to_cpu(tmp16);
530                                 /* Fifosize bufs */
531                                 cfpkt_extr_head(pkt, &tmp16, 2);
532                                 linkparam.u.utility.fifosize_bufs =
533                                     le16_to_cpu(tmp16);
534                                 /* name */
535                                 cp = (u8 *) linkparam.u.utility.name;
536                                 caif_assert(sizeof(linkparam.u.utility.name)
537                                              >= UTILITY_NAME_LENGTH);
538                                 for (i = 0;
539                                      i < UTILITY_NAME_LENGTH
540                                      && cfpkt_more(pkt); i++) {
541                                         cfpkt_extr_head(pkt, &tmp, 1);
542                                         *cp++ = tmp;
543                                 }
544                                 /* Length */
545                                 cfpkt_extr_head(pkt, &len, 1);
546                                 linkparam.u.utility.paramlen = len;
547                                 /* Param Data */
548                                 cp = linkparam.u.utility.params;
549                                 while (cfpkt_more(pkt) && len--) {
550                                         cfpkt_extr_head(pkt, &tmp, 1);
551                                         *cp++ = tmp;
552                                 }
553                                 if (CFCTRL_ERR_BIT & cmdrsp)
554                                         break;
555                                 /* Link ID */
556                                 cfpkt_extr_head(pkt, &linkid, 1);
557                                 /* Length */
558                                 cfpkt_extr_head(pkt, &len, 1);
559                                 /* Param Data */
560                                 cfpkt_extr_head(pkt, &param, len);
561                                 break;
562                         default:
563                                 pr_warning("CAIF: %s(): Request setup "
564                                            "- invalid link type (%d)",
565                                            __func__, serv);
566                                 goto error;
567                         }
568
569                         rsp.cmd = cmd;
570                         rsp.param = linkparam;
571                         req = cfctrl_remove_req(cfctrl, &rsp);
572
573                         if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
574                                 cfpkt_erroneous(pkt)) {
575                                 pr_err("CAIF: %s(): Invalid O/E bit or parse "
576                                        "error on CAIF control channel",
577                                         __func__);
578                                 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
579                                                        0,
580                                                        req ? req->client_layer
581                                                        : NULL);
582                         } else {
583                                 cfctrl->res.linksetup_rsp(cfctrl->serv.
584                                                           layer.up, linkid,
585                                                           serv, physlinkid,
586                                                           req ? req->
587                                                           client_layer : NULL);
588                         }
589
590                         if (req != NULL)
591                                 kfree(req);
592                 }
593                 break;
594         case CFCTRL_CMD_LINK_DESTROY:
595                 cfpkt_extr_head(pkt, &linkid, 1);
596                 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
597                 break;
598         case CFCTRL_CMD_LINK_ERR:
599                 pr_err("CAIF: %s(): Frame Error Indication received\n",
600                         __func__);
601                 cfctrl->res.linkerror_ind();
602                 break;
603         case CFCTRL_CMD_ENUM:
604                 cfctrl->res.enum_rsp();
605                 break;
606         case CFCTRL_CMD_SLEEP:
607                 cfctrl->res.sleep_rsp();
608                 break;
609         case CFCTRL_CMD_WAKE:
610                 cfctrl->res.wake_rsp();
611                 break;
612         case CFCTRL_CMD_LINK_RECONF:
613                 cfctrl->res.restart_rsp();
614                 break;
615         case CFCTRL_CMD_RADIO_SET:
616                 cfctrl->res.radioset_rsp();
617                 break;
618         default:
619                 pr_err("CAIF: %s(): Unrecognized Control Frame\n", __func__);
620                 goto error;
621                 break;
622         }
623         ret = 0;
624 error:
625         cfpkt_destroy(pkt);
626         return ret;
627 }
628
629 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
630                         int phyid)
631 {
632         struct cfctrl *this = container_obj(layr);
633         switch (ctrl) {
634         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
635         case CAIF_CTRLCMD_FLOW_OFF_IND:
636                 spin_lock(&this->info_list_lock);
637                 if (this->first_req != NULL) {
638                         pr_debug("CAIF: %s(): Received flow off in "
639                                    "control layer", __func__);
640                 }
641                 spin_unlock(&this->info_list_lock);
642                 break;
643         default:
644                 break;
645         }
646 }
647
648 #ifndef CAIF_NO_LOOP
649 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
650 {
651         static int last_linkid;
652         u8 linkid, linktype, tmp;
653         switch (cmd) {
654         case CFCTRL_CMD_LINK_SETUP:
655                 spin_lock(&ctrl->loop_linkid_lock);
656                 for (linkid = last_linkid + 1; linkid < 255; linkid++)
657                         if (!ctrl->loop_linkused[linkid])
658                                 goto found;
659                 for (linkid = last_linkid - 1; linkid > 0; linkid--)
660                         if (!ctrl->loop_linkused[linkid])
661                                 goto found;
662                 spin_unlock(&ctrl->loop_linkid_lock);
663                 pr_err("CAIF: %s(): Out of link-ids\n", __func__);
664                 return -EINVAL;
665 found:
666                 if (!ctrl->loop_linkused[linkid])
667                         ctrl->loop_linkused[linkid] = 1;
668
669                 last_linkid = linkid;
670
671                 cfpkt_add_trail(pkt, &linkid, 1);
672                 spin_unlock(&ctrl->loop_linkid_lock);
673                 cfpkt_peek_head(pkt, &linktype, 1);
674                 if (linktype ==  CFCTRL_SRV_UTIL) {
675                         tmp = 0x01;
676                         cfpkt_add_trail(pkt, &tmp, 1);
677                         cfpkt_add_trail(pkt, &tmp, 1);
678                 }
679                 break;
680
681         case CFCTRL_CMD_LINK_DESTROY:
682                 spin_lock(&ctrl->loop_linkid_lock);
683                 cfpkt_peek_head(pkt, &linkid, 1);
684                 ctrl->loop_linkused[linkid] = 0;
685                 spin_unlock(&ctrl->loop_linkid_lock);
686                 break;
687         default:
688                 break;
689         }
690         return CAIF_SUCCESS;
691 }
692 #endif