1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) ST-Ericsson AB 2010 |
4 | * Author: Sjur Brendeland |
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(size: 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(service: &this->serv, channel_id: 0, dev_info: &dev_info, supports_flowctrl: false); |
46 | atomic_set(v: &this->req_seq_no, i: 1); |
47 | atomic_set(v: &this->rsp_seq_no, i: 1); |
48 | this->serv.layer.receive = cfctrl_recv; |
49 | sprintf(buf: this->serv.layer.name, fmt: "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(list: &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(lock: &ctrl->info_list_lock); |
66 | list_for_each_entry_safe(p, tmp, &ctrl->list, list) { |
67 | list_del(entry: &p->list); |
68 | kfree(objp: p); |
69 | } |
70 | spin_unlock_bh(lock: &ctrl->info_list_lock); |
71 | kfree(objp: 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(p: p1->u.utility.params, q: p2->u.utility.params, |
103 | size: 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(p1: &r1->param, p2: &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(lock: &ctrl->info_list_lock); |
133 | atomic_inc(v: &ctrl->req_seq_no); |
134 | req->sequence_no = atomic_read(v: &ctrl->req_seq_no); |
135 | list_add_tail(new: &req->list, head: &ctrl->list); |
136 | spin_unlock_bh(lock: &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(r1: req, r2: p)) { |
149 | if (p != first) |
150 | pr_warn("Requests are not received in order\n" ); |
151 | |
152 | atomic_set(v: &ctrl->rsp_seq_no, |
153 | i: p->sequence_no); |
154 | list_del(entry: &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(info: cfpkt_info(pkt), cfctrl); |
191 | cfpkt_info(pkt)->dev_info->id = physlinkid; |
192 | cfctrl->serv.dev_info.id = physlinkid; |
193 | cfpkt_addbdy(pkt, data: CFCTRL_CMD_ENUM); |
194 | cfpkt_addbdy(pkt, data: 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(layr: layer, adap_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, data: CFCTRL_CMD_LINK_SETUP); |
229 | cfpkt_addbdy(pkt, data: (param->chtype << 4) | param->linktype); |
230 | cfpkt_addbdy(pkt, data: (param->priority << 3) | param->phyid); |
231 | cfpkt_addbdy(pkt, data: param->endpoint & 0x03); |
232 | |
233 | switch (param->linktype) { |
234 | case CFCTRL_SRV_VEI: |
235 | break; |
236 | case CFCTRL_SRV_VIDEO: |
237 | cfpkt_addbdy(pkt, data: (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, data: &tmp32, len: 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, data: &tmp32, len: 4); |
251 | /* Add volume name, including zero termination... */ |
252 | cfpkt_add_body(pkt, data: 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, data: &tmp16, len: 2); |
258 | tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs); |
259 | cfpkt_add_body(pkt, data: &tmp16, len: 2); |
260 | memset(utility_name, 0, sizeof(utility_name)); |
261 | strscpy(utility_name, param->u.utility.name, |
262 | UTILITY_NAME_LENGTH); |
263 | cfpkt_add_body(pkt, data: utility_name, UTILITY_NAME_LENGTH); |
264 | tmp8 = param->u.utility.paramlen; |
265 | cfpkt_add_body(pkt, data: &tmp8, len: 1); |
266 | cfpkt_add_body(pkt, data: param->u.utility.params, |
267 | len: param->u.utility.paramlen); |
268 | break; |
269 | default: |
270 | pr_warn("Request setup of bad link type = %d\n" , |
271 | param->linktype); |
272 | cfpkt_destroy(pkt); |
273 | return -EINVAL; |
274 | } |
275 | req = kzalloc(size: sizeof(*req), GFP_KERNEL); |
276 | if (!req) { |
277 | cfpkt_destroy(pkt); |
278 | return -ENOMEM; |
279 | } |
280 | |
281 | req->client_layer = user_layer; |
282 | req->cmd = CFCTRL_CMD_LINK_SETUP; |
283 | req->param = *param; |
284 | cfctrl_insert_req(ctrl: cfctrl, req); |
285 | init_info(info: cfpkt_info(pkt), cfctrl); |
286 | /* |
287 | * NOTE:Always send linkup and linkdown request on the same |
288 | * device as the payload. Otherwise old queued up payload |
289 | * might arrive with the newly allocated channel ID. |
290 | */ |
291 | cfpkt_info(pkt)->dev_info->id = param->phyid; |
292 | cfpkt_set_prio(pkt, TC_PRIO_CONTROL); |
293 | ret = |
294 | dn->transmit(dn, pkt); |
295 | if (ret < 0) { |
296 | int count; |
297 | |
298 | count = cfctrl_cancel_req(layr: &cfctrl->serv.layer, |
299 | adap_layer: user_layer); |
300 | if (count != 1) { |
301 | pr_err("Could not remove request (%d)" , count); |
302 | return -ENODEV; |
303 | } |
304 | } |
305 | return 0; |
306 | } |
307 | |
308 | int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid, |
309 | struct cflayer *client) |
310 | { |
311 | int ret; |
312 | struct cfpkt *pkt; |
313 | struct cfctrl *cfctrl = container_obj(layer); |
314 | struct cflayer *dn = cfctrl->serv.layer.dn; |
315 | |
316 | if (!dn) { |
317 | pr_debug("not able to send link-down request\n" ); |
318 | return -ENODEV; |
319 | } |
320 | pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); |
321 | if (!pkt) |
322 | return -ENOMEM; |
323 | cfpkt_addbdy(pkt, data: CFCTRL_CMD_LINK_DESTROY); |
324 | cfpkt_addbdy(pkt, data: channelid); |
325 | init_info(info: cfpkt_info(pkt), cfctrl); |
326 | cfpkt_set_prio(pkt, TC_PRIO_CONTROL); |
327 | ret = |
328 | dn->transmit(dn, pkt); |
329 | #ifndef CAIF_NO_LOOP |
330 | cfctrl->loop_linkused[channelid] = 0; |
331 | #endif |
332 | return ret; |
333 | } |
334 | |
335 | int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer) |
336 | { |
337 | struct cfctrl_request_info *p, *tmp; |
338 | struct cfctrl *ctrl = container_obj(layr); |
339 | int found = 0; |
340 | spin_lock_bh(lock: &ctrl->info_list_lock); |
341 | |
342 | list_for_each_entry_safe(p, tmp, &ctrl->list, list) { |
343 | if (p->client_layer == adap_layer) { |
344 | list_del(entry: &p->list); |
345 | kfree(objp: p); |
346 | found++; |
347 | } |
348 | } |
349 | |
350 | spin_unlock_bh(lock: &ctrl->info_list_lock); |
351 | return found; |
352 | } |
353 | |
354 | static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt) |
355 | { |
356 | u8 cmdrsp; |
357 | u8 cmd; |
358 | int ret = -1; |
359 | u8 len; |
360 | u8 param[255]; |
361 | u8 linkid = 0; |
362 | struct cfctrl *cfctrl = container_obj(layer); |
363 | struct cfctrl_request_info rsp, *req; |
364 | |
365 | |
366 | cmdrsp = cfpkt_extr_head_u8(pkt); |
367 | cmd = cmdrsp & CFCTRL_CMD_MASK; |
368 | if (cmd != CFCTRL_CMD_LINK_ERR |
369 | && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp) |
370 | && CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) { |
371 | if (handle_loop(ctrl: cfctrl, cmd, pkt) != 0) |
372 | cmdrsp |= CFCTRL_ERR_BIT; |
373 | } |
374 | |
375 | switch (cmd) { |
376 | case CFCTRL_CMD_LINK_SETUP: |
377 | { |
378 | enum cfctrl_srv serv; |
379 | enum cfctrl_srv servtype; |
380 | u8 endpoint; |
381 | u8 physlinkid; |
382 | u8 prio; |
383 | u8 tmp; |
384 | u8 *cp; |
385 | int i; |
386 | struct cfctrl_link_param linkparam; |
387 | memset(&linkparam, 0, sizeof(linkparam)); |
388 | |
389 | tmp = cfpkt_extr_head_u8(pkt); |
390 | |
391 | serv = tmp & CFCTRL_SRV_MASK; |
392 | linkparam.linktype = serv; |
393 | |
394 | servtype = tmp >> 4; |
395 | linkparam.chtype = servtype; |
396 | |
397 | tmp = cfpkt_extr_head_u8(pkt); |
398 | physlinkid = tmp & 0x07; |
399 | prio = tmp >> 3; |
400 | |
401 | linkparam.priority = prio; |
402 | linkparam.phyid = physlinkid; |
403 | endpoint = cfpkt_extr_head_u8(pkt); |
404 | linkparam.endpoint = endpoint & 0x03; |
405 | |
406 | switch (serv) { |
407 | case CFCTRL_SRV_VEI: |
408 | case CFCTRL_SRV_DBG: |
409 | if (CFCTRL_ERR_BIT & cmdrsp) |
410 | break; |
411 | /* Link ID */ |
412 | linkid = cfpkt_extr_head_u8(pkt); |
413 | break; |
414 | case CFCTRL_SRV_VIDEO: |
415 | tmp = cfpkt_extr_head_u8(pkt); |
416 | linkparam.u.video.connid = tmp; |
417 | if (CFCTRL_ERR_BIT & cmdrsp) |
418 | break; |
419 | /* Link ID */ |
420 | linkid = cfpkt_extr_head_u8(pkt); |
421 | break; |
422 | |
423 | case CFCTRL_SRV_DATAGRAM: |
424 | linkparam.u.datagram.connid = |
425 | cfpkt_extr_head_u32(pkt); |
426 | if (CFCTRL_ERR_BIT & cmdrsp) |
427 | break; |
428 | /* Link ID */ |
429 | linkid = cfpkt_extr_head_u8(pkt); |
430 | break; |
431 | case CFCTRL_SRV_RFM: |
432 | /* Construct a frame, convert |
433 | * DatagramConnectionID |
434 | * to network format long and copy it out... |
435 | */ |
436 | linkparam.u.rfm.connid = |
437 | cfpkt_extr_head_u32(pkt); |
438 | cp = (u8 *) linkparam.u.rfm.volume; |
439 | for (tmp = cfpkt_extr_head_u8(pkt); |
440 | cfpkt_more(pkt) && tmp != '\0'; |
441 | tmp = cfpkt_extr_head_u8(pkt)) |
442 | *cp++ = tmp; |
443 | *cp = '\0'; |
444 | |
445 | if (CFCTRL_ERR_BIT & cmdrsp) |
446 | break; |
447 | /* Link ID */ |
448 | linkid = cfpkt_extr_head_u8(pkt); |
449 | |
450 | break; |
451 | case CFCTRL_SRV_UTIL: |
452 | /* Construct a frame, convert |
453 | * DatagramConnectionID |
454 | * to network format long and copy it out... |
455 | */ |
456 | /* Fifosize KB */ |
457 | linkparam.u.utility.fifosize_kb = |
458 | cfpkt_extr_head_u16(pkt); |
459 | /* Fifosize bufs */ |
460 | linkparam.u.utility.fifosize_bufs = |
461 | cfpkt_extr_head_u16(pkt); |
462 | /* name */ |
463 | cp = (u8 *) linkparam.u.utility.name; |
464 | caif_assert(sizeof(linkparam.u.utility.name) |
465 | >= UTILITY_NAME_LENGTH); |
466 | for (i = 0; |
467 | i < UTILITY_NAME_LENGTH |
468 | && cfpkt_more(pkt); i++) { |
469 | tmp = cfpkt_extr_head_u8(pkt); |
470 | *cp++ = tmp; |
471 | } |
472 | /* Length */ |
473 | len = cfpkt_extr_head_u8(pkt); |
474 | linkparam.u.utility.paramlen = len; |
475 | /* Param Data */ |
476 | cp = linkparam.u.utility.params; |
477 | while (cfpkt_more(pkt) && len--) { |
478 | tmp = cfpkt_extr_head_u8(pkt); |
479 | *cp++ = tmp; |
480 | } |
481 | if (CFCTRL_ERR_BIT & cmdrsp) |
482 | break; |
483 | /* Link ID */ |
484 | linkid = cfpkt_extr_head_u8(pkt); |
485 | /* Length */ |
486 | len = cfpkt_extr_head_u8(pkt); |
487 | /* Param Data */ |
488 | cfpkt_extr_head(pkt, data: ¶m, len); |
489 | break; |
490 | default: |
491 | pr_warn("Request setup, invalid type (%d)\n" , |
492 | serv); |
493 | goto error; |
494 | } |
495 | |
496 | rsp.cmd = cmd; |
497 | rsp.param = linkparam; |
498 | spin_lock_bh(lock: &cfctrl->info_list_lock); |
499 | req = cfctrl_remove_req(ctrl: cfctrl, req: &rsp); |
500 | |
501 | if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) || |
502 | cfpkt_erroneous(pkt)) { |
503 | pr_err("Invalid O/E bit or parse error " |
504 | "on CAIF control channel\n" ); |
505 | cfctrl->res.reject_rsp(cfctrl->serv.layer.up, |
506 | 0, |
507 | req ? req->client_layer |
508 | : NULL); |
509 | } else { |
510 | cfctrl->res.linksetup_rsp(cfctrl->serv. |
511 | layer.up, linkid, |
512 | serv, physlinkid, |
513 | req ? req-> |
514 | client_layer : NULL); |
515 | } |
516 | |
517 | kfree(objp: req); |
518 | |
519 | spin_unlock_bh(lock: &cfctrl->info_list_lock); |
520 | } |
521 | break; |
522 | case CFCTRL_CMD_LINK_DESTROY: |
523 | linkid = cfpkt_extr_head_u8(pkt); |
524 | cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid); |
525 | break; |
526 | case CFCTRL_CMD_LINK_ERR: |
527 | pr_err("Frame Error Indication received\n" ); |
528 | cfctrl->res.linkerror_ind(); |
529 | break; |
530 | case CFCTRL_CMD_ENUM: |
531 | cfctrl->res.enum_rsp(); |
532 | break; |
533 | case CFCTRL_CMD_SLEEP: |
534 | cfctrl->res.sleep_rsp(); |
535 | break; |
536 | case CFCTRL_CMD_WAKE: |
537 | cfctrl->res.wake_rsp(); |
538 | break; |
539 | case CFCTRL_CMD_LINK_RECONF: |
540 | cfctrl->res.restart_rsp(); |
541 | break; |
542 | case CFCTRL_CMD_RADIO_SET: |
543 | cfctrl->res.radioset_rsp(); |
544 | break; |
545 | default: |
546 | pr_err("Unrecognized Control Frame\n" ); |
547 | goto error; |
548 | } |
549 | ret = 0; |
550 | error: |
551 | cfpkt_destroy(pkt); |
552 | return ret; |
553 | } |
554 | |
555 | static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, |
556 | int phyid) |
557 | { |
558 | struct cfctrl *this = container_obj(layr); |
559 | switch (ctrl) { |
560 | case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND: |
561 | case CAIF_CTRLCMD_FLOW_OFF_IND: |
562 | spin_lock_bh(lock: &this->info_list_lock); |
563 | if (!list_empty(head: &this->list)) |
564 | pr_debug("Received flow off in control layer\n" ); |
565 | spin_unlock_bh(lock: &this->info_list_lock); |
566 | break; |
567 | case _CAIF_CTRLCMD_PHYIF_DOWN_IND: { |
568 | struct cfctrl_request_info *p, *tmp; |
569 | |
570 | /* Find all connect request and report failure */ |
571 | spin_lock_bh(lock: &this->info_list_lock); |
572 | list_for_each_entry_safe(p, tmp, &this->list, list) { |
573 | if (p->param.phyid == phyid) { |
574 | list_del(entry: &p->list); |
575 | p->client_layer->ctrlcmd(p->client_layer, |
576 | CAIF_CTRLCMD_INIT_FAIL_RSP, |
577 | phyid); |
578 | kfree(objp: p); |
579 | } |
580 | } |
581 | spin_unlock_bh(lock: &this->info_list_lock); |
582 | break; |
583 | } |
584 | default: |
585 | break; |
586 | } |
587 | } |
588 | |
589 | #ifndef CAIF_NO_LOOP |
590 | static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt) |
591 | { |
592 | static int last_linkid; |
593 | static int dec; |
594 | u8 linkid, linktype, tmp; |
595 | switch (cmd) { |
596 | case CFCTRL_CMD_LINK_SETUP: |
597 | spin_lock_bh(lock: &ctrl->loop_linkid_lock); |
598 | if (!dec) { |
599 | for (linkid = last_linkid + 1; linkid < 254; linkid++) |
600 | if (!ctrl->loop_linkused[linkid]) |
601 | goto found; |
602 | } |
603 | dec = 1; |
604 | for (linkid = last_linkid - 1; linkid > 1; linkid--) |
605 | if (!ctrl->loop_linkused[linkid]) |
606 | goto found; |
607 | spin_unlock_bh(lock: &ctrl->loop_linkid_lock); |
608 | return -1; |
609 | found: |
610 | if (linkid < 10) |
611 | dec = 0; |
612 | |
613 | if (!ctrl->loop_linkused[linkid]) |
614 | ctrl->loop_linkused[linkid] = 1; |
615 | |
616 | last_linkid = linkid; |
617 | |
618 | cfpkt_add_trail(pkt, data: &linkid, len: 1); |
619 | spin_unlock_bh(lock: &ctrl->loop_linkid_lock); |
620 | cfpkt_peek_head(pkt, data: &linktype, len: 1); |
621 | if (linktype == CFCTRL_SRV_UTIL) { |
622 | tmp = 0x01; |
623 | cfpkt_add_trail(pkt, data: &tmp, len: 1); |
624 | cfpkt_add_trail(pkt, data: &tmp, len: 1); |
625 | } |
626 | break; |
627 | |
628 | case CFCTRL_CMD_LINK_DESTROY: |
629 | spin_lock_bh(lock: &ctrl->loop_linkid_lock); |
630 | cfpkt_peek_head(pkt, data: &linkid, len: 1); |
631 | ctrl->loop_linkused[linkid] = 0; |
632 | spin_unlock_bh(lock: &ctrl->loop_linkid_lock); |
633 | break; |
634 | default: |
635 | break; |
636 | } |
637 | return 0; |
638 | } |
639 | #endif |
640 | |