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6
7#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8
9#include <linux/kernel.h>
10#include <linux/stddef.h>
11#include <linux/slab.h>
12#include <linux/netdevice.h>
13#include <linux/module.h>
14#include <net/caif/caif_layer.h>
15#include <net/caif/cfpkt.h>
16#include <net/caif/cfcnfg.h>
17#include <net/caif/cfctrl.h>
18#include <net/caif/cfmuxl.h>
19#include <net/caif/cffrml.h>
20#include <net/caif/cfserl.h>
21#include <net/caif/cfsrvl.h>
22#include <net/caif/caif_dev.h>
23
24#define container_obj(layr) container_of(layr, struct cfcnfg, layer)
25
26
27
28
29struct cfcnfg_phyinfo {
30 struct list_head node;
31 bool up;
32
33
34 struct cflayer *frm_layer;
35
36 struct cflayer *phy_layer;
37
38 unsigned int id;
39
40 enum cfcnfg_phy_preference pref;
41
42
43 struct dev_info dev_info;
44
45
46 int ifindex;
47
48
49 bool use_stx;
50
51
52 bool use_fcs;
53};
54
55struct cfcnfg {
56 struct cflayer layer;
57 struct cflayer *ctrl;
58 struct cflayer *mux;
59 struct list_head phys;
60 struct mutex lock;
61};
62
63static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
64 enum cfctrl_srv serv, u8 phyid,
65 struct cflayer *adapt_layer);
66static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
67static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
68 struct cflayer *adapt_layer);
69static void cfctrl_resp_func(void);
70static void cfctrl_enum_resp(void);
71
72struct cfcnfg *cfcnfg_create(void)
73{
74 struct cfcnfg *this;
75 struct cfctrl_rsp *resp;
76
77 might_sleep();
78
79
80 this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
81 if (!this)
82 return NULL;
83 this->mux = cfmuxl_create();
84 if (!this->mux)
85 goto out_of_mem;
86 this->ctrl = cfctrl_create();
87 if (!this->ctrl)
88 goto out_of_mem;
89
90 resp = cfctrl_get_respfuncs(this->ctrl);
91 resp->enum_rsp = cfctrl_enum_resp;
92 resp->linkerror_ind = cfctrl_resp_func;
93 resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
94 resp->sleep_rsp = cfctrl_resp_func;
95 resp->wake_rsp = cfctrl_resp_func;
96 resp->restart_rsp = cfctrl_resp_func;
97 resp->radioset_rsp = cfctrl_resp_func;
98 resp->linksetup_rsp = cfcnfg_linkup_rsp;
99 resp->reject_rsp = cfcnfg_reject_rsp;
100 INIT_LIST_HEAD(&this->phys);
101
102 cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
103 layer_set_dn(this->ctrl, this->mux);
104 layer_set_up(this->ctrl, this);
105 mutex_init(&this->lock);
106
107 return this;
108out_of_mem:
109 synchronize_rcu();
110
111 kfree(this->mux);
112 kfree(this->ctrl);
113 kfree(this);
114 return NULL;
115}
116
117void cfcnfg_remove(struct cfcnfg *cfg)
118{
119 might_sleep();
120 if (cfg) {
121 synchronize_rcu();
122
123 kfree(cfg->mux);
124 cfctrl_remove(cfg->ctrl);
125 kfree(cfg);
126 }
127}
128
129static void cfctrl_resp_func(void)
130{
131}
132
133static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo_rcu(struct cfcnfg *cnfg,
134 u8 phyid)
135{
136 struct cfcnfg_phyinfo *phy;
137
138 list_for_each_entry_rcu(phy, &cnfg->phys, node)
139 if (phy->id == phyid)
140 return phy;
141 return NULL;
142}
143
144static void cfctrl_enum_resp(void)
145{
146}
147
148static struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
149 enum cfcnfg_phy_preference phy_pref)
150{
151
152 struct cfcnfg_phyinfo *phy;
153
154 list_for_each_entry_rcu(phy, &cnfg->phys, node) {
155 if (phy->up && phy->pref == phy_pref &&
156 phy->frm_layer != NULL)
157
158 return &phy->dev_info;
159 }
160
161
162 list_for_each_entry_rcu(phy, &cnfg->phys, node)
163 if (phy->up)
164 return &phy->dev_info;
165
166 return NULL;
167}
168
169static int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
170{
171 struct cfcnfg_phyinfo *phy;
172
173 list_for_each_entry_rcu(phy, &cnfg->phys, node)
174 if (phy->ifindex == ifi && phy->up)
175 return phy->id;
176 return -ENODEV;
177}
178
179int caif_disconnect_client(struct net *net, struct cflayer *adap_layer)
180{
181 u8 channel_id;
182 struct cfcnfg *cfg = get_cfcnfg(net);
183
184 caif_assert(adap_layer != NULL);
185 cfctrl_cancel_req(cfg->ctrl, adap_layer);
186 channel_id = adap_layer->id;
187 if (channel_id != 0) {
188 struct cflayer *servl;
189 servl = cfmuxl_remove_uplayer(cfg->mux, channel_id);
190 if (servl != NULL)
191 layer_set_up(servl, NULL);
192 } else
193 pr_debug("nothing to disconnect\n");
194 cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer);
195
196
197 synchronize_rcu();
198 if (adap_layer->ctrlcmd != NULL)
199 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
200 return 0;
201
202}
203EXPORT_SYMBOL(caif_disconnect_client);
204
205static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
206{
207}
208
209static const int protohead[CFCTRL_SRV_MASK] = {
210 [CFCTRL_SRV_VEI] = 4,
211 [CFCTRL_SRV_DATAGRAM] = 7,
212 [CFCTRL_SRV_UTIL] = 4,
213 [CFCTRL_SRV_RFM] = 3,
214 [CFCTRL_SRV_DBG] = 3,
215};
216
217
218static int caif_connect_req_to_link_param(struct cfcnfg *cnfg,
219 struct caif_connect_request *s,
220 struct cfctrl_link_param *l)
221{
222 struct dev_info *dev_info;
223 enum cfcnfg_phy_preference pref;
224 int res;
225
226 memset(l, 0, sizeof(*l));
227
228 l->priority = CAIF_PRIO_MAX - s->priority + 1;
229
230 if (s->ifindex != 0) {
231 res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex);
232 if (res < 0)
233 return res;
234 l->phyid = res;
235 } else {
236 switch (s->link_selector) {
237 case CAIF_LINK_HIGH_BANDW:
238 pref = CFPHYPREF_HIGH_BW;
239 break;
240 case CAIF_LINK_LOW_LATENCY:
241 pref = CFPHYPREF_LOW_LAT;
242 break;
243 default:
244 return -EINVAL;
245 }
246 dev_info = cfcnfg_get_phyid(cnfg, pref);
247 if (dev_info == NULL)
248 return -ENODEV;
249 l->phyid = dev_info->id;
250 }
251 switch (s->protocol) {
252 case CAIFPROTO_AT:
253 l->linktype = CFCTRL_SRV_VEI;
254 l->endpoint = (s->sockaddr.u.at.type >> 2) & 0x3;
255 l->chtype = s->sockaddr.u.at.type & 0x3;
256 break;
257 case CAIFPROTO_DATAGRAM:
258 l->linktype = CFCTRL_SRV_DATAGRAM;
259 l->chtype = 0x00;
260 l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
261 break;
262 case CAIFPROTO_DATAGRAM_LOOP:
263 l->linktype = CFCTRL_SRV_DATAGRAM;
264 l->chtype = 0x03;
265 l->endpoint = 0x00;
266 l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
267 break;
268 case CAIFPROTO_RFM:
269 l->linktype = CFCTRL_SRV_RFM;
270 l->u.datagram.connid = s->sockaddr.u.rfm.connection_id;
271 strncpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume,
272 sizeof(l->u.rfm.volume)-1);
273 l->u.rfm.volume[sizeof(l->u.rfm.volume)-1] = 0;
274 break;
275 case CAIFPROTO_UTIL:
276 l->linktype = CFCTRL_SRV_UTIL;
277 l->endpoint = 0x00;
278 l->chtype = 0x00;
279 strncpy(l->u.utility.name, s->sockaddr.u.util.service,
280 sizeof(l->u.utility.name)-1);
281 l->u.utility.name[sizeof(l->u.utility.name)-1] = 0;
282 caif_assert(sizeof(l->u.utility.name) > 10);
283 l->u.utility.paramlen = s->param.size;
284 if (l->u.utility.paramlen > sizeof(l->u.utility.params))
285 l->u.utility.paramlen = sizeof(l->u.utility.params);
286
287 memcpy(l->u.utility.params, s->param.data,
288 l->u.utility.paramlen);
289
290 break;
291 case CAIFPROTO_DEBUG:
292 l->linktype = CFCTRL_SRV_DBG;
293 l->endpoint = s->sockaddr.u.dbg.service;
294 l->chtype = s->sockaddr.u.dbg.type;
295 break;
296 default:
297 return -EINVAL;
298 }
299 return 0;
300}
301
302int caif_connect_client(struct net *net, struct caif_connect_request *conn_req,
303 struct cflayer *adap_layer, int *ifindex,
304 int *proto_head,
305 int *proto_tail)
306{
307 struct cflayer *frml;
308 struct cfcnfg_phyinfo *phy;
309 int err;
310 struct cfctrl_link_param param;
311 struct cfcnfg *cfg = get_cfcnfg(net);
312 caif_assert(cfg != NULL);
313
314 rcu_read_lock();
315 err = caif_connect_req_to_link_param(cfg, conn_req, ¶m);
316 if (err)
317 goto unlock;
318
319 phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid);
320 if (!phy) {
321 err = -ENODEV;
322 goto unlock;
323 }
324 err = -EINVAL;
325
326 if (adap_layer == NULL) {
327 pr_err("adap_layer is zero\n");
328 goto unlock;
329 }
330 if (adap_layer->receive == NULL) {
331 pr_err("adap_layer->receive is NULL\n");
332 goto unlock;
333 }
334 if (adap_layer->ctrlcmd == NULL) {
335 pr_err("adap_layer->ctrlcmd == NULL\n");
336 goto unlock;
337 }
338
339 err = -ENODEV;
340 frml = phy->frm_layer;
341 if (frml == NULL) {
342 pr_err("Specified PHY type does not exist!\n");
343 goto unlock;
344 }
345 caif_assert(param.phyid == phy->id);
346 caif_assert(phy->frm_layer->id ==
347 param.phyid);
348 caif_assert(phy->phy_layer->id ==
349 param.phyid);
350
351 *ifindex = phy->ifindex;
352 *proto_tail = 2;
353 *proto_head =
354
355 protohead[param.linktype] + (phy->use_stx ? 1 : 0);
356
357 rcu_read_unlock();
358
359
360 cfctrl_enum_req(cfg->ctrl, param.phyid);
361 return cfctrl_linkup_request(cfg->ctrl, ¶m, adap_layer);
362
363unlock:
364 rcu_read_unlock();
365 return err;
366}
367EXPORT_SYMBOL(caif_connect_client);
368
369static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
370 struct cflayer *adapt_layer)
371{
372 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
373 adapt_layer->ctrlcmd(adapt_layer,
374 CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
375}
376
377static void
378cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
379 u8 phyid, struct cflayer *adapt_layer)
380{
381 struct cfcnfg *cnfg = container_obj(layer);
382 struct cflayer *servicel = NULL;
383 struct cfcnfg_phyinfo *phyinfo;
384 struct net_device *netdev;
385
386 if (channel_id == 0) {
387 pr_warn("received channel_id zero\n");
388 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
389 adapt_layer->ctrlcmd(adapt_layer,
390 CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
391 return;
392 }
393
394 rcu_read_lock();
395
396 if (adapt_layer == NULL) {
397 pr_debug("link setup response but no client exist,"
398 "send linkdown back\n");
399 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
400 goto unlock;
401 }
402
403 caif_assert(cnfg != NULL);
404 caif_assert(phyid != 0);
405
406 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);
407 if (phyinfo == NULL) {
408 pr_err("ERROR: Link Layer Device dissapeared"
409 "while connecting\n");
410 goto unlock;
411 }
412
413 caif_assert(phyinfo != NULL);
414 caif_assert(phyinfo->id == phyid);
415 caif_assert(phyinfo->phy_layer != NULL);
416 caif_assert(phyinfo->phy_layer->id == phyid);
417
418 adapt_layer->id = channel_id;
419
420 switch (serv) {
421 case CFCTRL_SRV_VEI:
422 servicel = cfvei_create(channel_id, &phyinfo->dev_info);
423 break;
424 case CFCTRL_SRV_DATAGRAM:
425 servicel = cfdgml_create(channel_id,
426 &phyinfo->dev_info);
427 break;
428 case CFCTRL_SRV_RFM:
429 netdev = phyinfo->dev_info.dev;
430 servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
431 netdev->mtu);
432 break;
433 case CFCTRL_SRV_UTIL:
434 servicel = cfutill_create(channel_id, &phyinfo->dev_info);
435 break;
436 case CFCTRL_SRV_VIDEO:
437 servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
438 break;
439 case CFCTRL_SRV_DBG:
440 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
441 break;
442 default:
443 pr_err("Protocol error. Link setup response "
444 "- unknown channel type\n");
445 goto unlock;
446 }
447 if (!servicel)
448 goto unlock;
449 layer_set_dn(servicel, cnfg->mux);
450 cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
451 layer_set_up(servicel, adapt_layer);
452 layer_set_dn(adapt_layer, servicel);
453
454 rcu_read_unlock();
455
456 servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
457 return;
458unlock:
459 rcu_read_unlock();
460}
461
462void
463cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
464 struct net_device *dev, struct cflayer *phy_layer,
465 enum cfcnfg_phy_preference pref,
466 bool fcs, bool stx)
467{
468 struct cflayer *frml;
469 struct cflayer *phy_driver = NULL;
470 struct cfcnfg_phyinfo *phyinfo = NULL;
471 int i;
472 u8 phyid;
473
474 mutex_lock(&cnfg->lock);
475
476
477 for (i = 0; i < 7; i++) {
478 phyid = (dev->ifindex + i) & 0x7;
479 if (phyid == 0)
480 continue;
481 if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL)
482 goto got_phyid;
483 }
484 pr_warn("Too many CAIF Link Layers (max 6)\n");
485 goto out_err;
486
487got_phyid:
488 phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC);
489 if (!phyinfo)
490 goto out_err;
491
492 switch (phy_type) {
493 case CFPHYTYPE_FRAG:
494 phy_driver =
495 cfserl_create(CFPHYTYPE_FRAG, phyid, stx);
496 if (!phy_driver)
497 goto out_err;
498 break;
499 case CFPHYTYPE_CAIF:
500 phy_driver = NULL;
501 break;
502 default:
503 goto out_err;
504 }
505 phy_layer->id = phyid;
506 phyinfo->pref = pref;
507 phyinfo->id = phyid;
508 phyinfo->dev_info.id = phyid;
509 phyinfo->dev_info.dev = dev;
510 phyinfo->phy_layer = phy_layer;
511 phyinfo->ifindex = dev->ifindex;
512 phyinfo->use_stx = stx;
513 phyinfo->use_fcs = fcs;
514
515 frml = cffrml_create(phyid, fcs);
516
517 if (!frml)
518 goto out_err;
519 phyinfo->frm_layer = frml;
520 layer_set_up(frml, cnfg->mux);
521
522 if (phy_driver != NULL) {
523 phy_driver->id = phyid;
524 layer_set_dn(frml, phy_driver);
525 layer_set_up(phy_driver, frml);
526 layer_set_dn(phy_driver, phy_layer);
527 layer_set_up(phy_layer, phy_driver);
528 } else {
529 layer_set_dn(frml, phy_layer);
530 layer_set_up(phy_layer, frml);
531 }
532
533 list_add_rcu(&phyinfo->node, &cnfg->phys);
534 mutex_unlock(&cnfg->lock);
535 return;
536
537out_err:
538 kfree(phy_driver);
539 kfree(phyinfo);
540 mutex_unlock(&cnfg->lock);
541}
542EXPORT_SYMBOL(cfcnfg_add_phy_layer);
543
544int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer,
545 bool up)
546{
547 struct cfcnfg_phyinfo *phyinfo;
548
549 rcu_read_lock();
550 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id);
551 if (phyinfo == NULL) {
552 rcu_read_unlock();
553 return -ENODEV;
554 }
555
556 if (phyinfo->up == up) {
557 rcu_read_unlock();
558 return 0;
559 }
560 phyinfo->up = up;
561
562 if (up) {
563 cffrml_hold(phyinfo->frm_layer);
564 cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer,
565 phy_layer->id);
566 } else {
567 cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
568 cffrml_put(phyinfo->frm_layer);
569 }
570
571 rcu_read_unlock();
572 return 0;
573}
574EXPORT_SYMBOL(cfcnfg_set_phy_state);
575
576int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
577{
578 struct cflayer *frml, *frml_dn;
579 u16 phyid;
580 struct cfcnfg_phyinfo *phyinfo;
581
582 might_sleep();
583
584 mutex_lock(&cnfg->lock);
585
586 phyid = phy_layer->id;
587 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);
588
589 if (phyinfo == NULL) {
590 mutex_unlock(&cnfg->lock);
591 return 0;
592 }
593 caif_assert(phyid == phyinfo->id);
594 caif_assert(phy_layer == phyinfo->phy_layer);
595 caif_assert(phy_layer->id == phyid);
596 caif_assert(phyinfo->frm_layer->id == phyid);
597
598 list_del_rcu(&phyinfo->node);
599 synchronize_rcu();
600
601
602 if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) {
603 pr_info("Wait for device inuse\n");
604 list_add_rcu(&phyinfo->node, &cnfg->phys);
605 mutex_unlock(&cnfg->lock);
606 return -EAGAIN;
607 }
608
609 frml = phyinfo->frm_layer;
610 frml_dn = frml->dn;
611 cffrml_set_uplayer(frml, NULL);
612 cffrml_set_dnlayer(frml, NULL);
613 if (phy_layer != frml_dn) {
614 layer_set_up(frml_dn, NULL);
615 layer_set_dn(frml_dn, NULL);
616 }
617 layer_set_up(phy_layer, NULL);
618
619 if (phyinfo->phy_layer != frml_dn)
620 kfree(frml_dn);
621
622 cffrml_free(frml);
623 kfree(phyinfo);
624 mutex_unlock(&cnfg->lock);
625
626 return 0;
627}
628EXPORT_SYMBOL(cfcnfg_del_phy_layer);
629
