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 cfctrl *cfctrl = container_obj(layer); 179 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 180 struct cflayer *dn = cfctrl->serv.layer.dn; 181 if (!pkt) 182 return; 183 if (!dn) { 184 pr_debug("not able to send enum request\n"); 185 return; 186 } 187 caif_assert(offsetof(struct cfctrl, serv.layer) == 0); 188 init_info(cfpkt_info(pkt), cfctrl); 189 cfpkt_info(pkt)->dev_info->id = physlinkid; 190 cfctrl->serv.dev_info.id = physlinkid; 191 cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM); 192 cfpkt_addbdy(pkt, physlinkid); 193 cfpkt_set_prio(pkt, TC_PRIO_CONTROL); 194 dn->transmit(dn, pkt); 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; 209 struct cflayer *dn = cfctrl->serv.layer.dn; 210 211 if (!dn) { 212 pr_debug("not able to send linkup request\n"); 213 return -ENODEV; 214 } 215 216 if (cfctrl_cancel_req(layer, user_layer) > 0) { 217 /* Slight Paranoia, check if already connecting */ 218 pr_err("Duplicate connect request for same client\n"); 219 WARN_ON(1); 220 return -EALREADY; 221 } 222 223 pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 224 if (!pkt) 225 return -ENOMEM; 226 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP); 227 cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype); 228 cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid); 229 cfpkt_addbdy(pkt, param->endpoint & 0x03); 230 231 switch (param->linktype) { 232 case CFCTRL_SRV_VEI: 233 break; 234 case CFCTRL_SRV_VIDEO: 235 cfpkt_addbdy(pkt, (u8) param->u.video.connid); 236 break; 237 case CFCTRL_SRV_DBG: 238 break; 239 case CFCTRL_SRV_DATAGRAM: 240 tmp32 = cpu_to_le32(param->u.datagram.connid); 241 cfpkt_add_body(pkt, &tmp32, 4); 242 break; 243 case CFCTRL_SRV_RFM: 244 /* Construct a frame, convert DatagramConnectionID to network 245 * format long and copy it out... 246 */ 247 tmp32 = cpu_to_le32(param->u.rfm.connid); 248 cfpkt_add_body(pkt, &tmp32, 4); 249 /* Add volume name, including zero termination... */ 250 cfpkt_add_body(pkt, param->u.rfm.volume, 251 strlen(param->u.rfm.volume) + 1); 252 break; 253 case CFCTRL_SRV_UTIL: 254 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb); 255 cfpkt_add_body(pkt, &tmp16, 2); 256 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs); 257 cfpkt_add_body(pkt, &tmp16, 2); 258 memset(utility_name, 0, sizeof(utility_name)); 259 strncpy(utility_name, param->u.utility.name, 260 UTILITY_NAME_LENGTH - 1); 261 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH); 262 tmp8 = param->u.utility.paramlen; 263 cfpkt_add_body(pkt, &tmp8, 1); 264 cfpkt_add_body(pkt, param->u.utility.params, 265 param->u.utility.paramlen); 266 break; 267 default: 268 pr_warn("Request setup of bad link type = %d\n", 269 param->linktype); 270 return -EINVAL; 271 } 272 req = kzalloc(sizeof(*req), GFP_KERNEL); 273 if (!req) 274 return -ENOMEM; 275 req->client_layer = user_layer; 276 req->cmd = CFCTRL_CMD_LINK_SETUP; 277 req->param = *param; 278 cfctrl_insert_req(cfctrl, req); 279 init_info(cfpkt_info(pkt), cfctrl); 280 /* 281 * NOTE:Always send linkup and linkdown request on the same 282 * device as the payload. Otherwise old queued up payload 283 * might arrive with the newly allocated channel ID. 284 */ 285 cfpkt_info(pkt)->dev_info->id = param->phyid; 286 cfpkt_set_prio(pkt, TC_PRIO_CONTROL); 287 ret = 288 dn->transmit(dn, pkt); 289 if (ret < 0) { 290 int count; 291 292 count = cfctrl_cancel_req(&cfctrl->serv.layer, 293 user_layer); 294 if (count != 1) 295 pr_err("Could not remove request (%d)", count); 296 return -ENODEV; 297 } 298 return 0; 299 } 300 301 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid, 302 struct cflayer *client) 303 { 304 int ret; 305 struct cfctrl *cfctrl = container_obj(layer); 306 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 307 struct cflayer *dn = cfctrl->serv.layer.dn; 308 309 if (!pkt) 310 return -ENOMEM; 311 312 if (!dn) { 313 pr_debug("not able to send link-down request\n"); 314 return -ENODEV; 315 } 316 317 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY); 318 cfpkt_addbdy(pkt, channelid); 319 init_info(cfpkt_info(pkt), cfctrl); 320 cfpkt_set_prio(pkt, TC_PRIO_CONTROL); 321 ret = 322 dn->transmit(dn, pkt); 323 #ifndef CAIF_NO_LOOP 324 cfctrl->loop_linkused[channelid] = 0; 325 #endif 326 return ret; 327 } 328 329 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer) 330 { 331 struct cfctrl_request_info *p, *tmp; 332 struct cfctrl *ctrl = container_obj(layr); 333 int found = 0; 334 spin_lock_bh(&ctrl->info_list_lock); 335 336 list_for_each_entry_safe(p, tmp, &ctrl->list, list) { 337 if (p->client_layer == adap_layer) { 338 list_del(&p->list); 339 kfree(p); 340 found++; 341 } 342 } 343 344 spin_unlock_bh(&ctrl->info_list_lock); 345 return found; 346 } 347 348 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt) 349 { 350 u8 cmdrsp; 351 u8 cmd; 352 int ret = -1; 353 u16 tmp16; 354 u8 len; 355 u8 param[255]; 356 u8 linkid; 357 struct cfctrl *cfctrl = container_obj(layer); 358 struct cfctrl_request_info rsp, *req; 359 360 361 cfpkt_extr_head(pkt, &cmdrsp, 1); 362 cmd = cmdrsp & CFCTRL_CMD_MASK; 363 if (cmd != CFCTRL_CMD_LINK_ERR 364 && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp) 365 && CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) { 366 if (handle_loop(cfctrl, cmd, pkt) != 0) 367 cmdrsp |= CFCTRL_ERR_BIT; 368 } 369 370 switch (cmd) { 371 case CFCTRL_CMD_LINK_SETUP: 372 { 373 enum cfctrl_srv serv; 374 enum cfctrl_srv servtype; 375 u8 endpoint; 376 u8 physlinkid; 377 u8 prio; 378 u8 tmp; 379 u32 tmp32; 380 u8 *cp; 381 int i; 382 struct cfctrl_link_param linkparam; 383 memset(&linkparam, 0, sizeof(linkparam)); 384 385 cfpkt_extr_head(pkt, &tmp, 1); 386 387 serv = tmp & CFCTRL_SRV_MASK; 388 linkparam.linktype = serv; 389 390 servtype = tmp >> 4; 391 linkparam.chtype = servtype; 392 393 cfpkt_extr_head(pkt, &tmp, 1); 394 physlinkid = tmp & 0x07; 395 prio = tmp >> 3; 396 397 linkparam.priority = prio; 398 linkparam.phyid = physlinkid; 399 cfpkt_extr_head(pkt, &endpoint, 1); 400 linkparam.endpoint = endpoint & 0x03; 401 402 switch (serv) { 403 case CFCTRL_SRV_VEI: 404 case CFCTRL_SRV_DBG: 405 if (CFCTRL_ERR_BIT & cmdrsp) 406 break; 407 /* Link ID */ 408 cfpkt_extr_head(pkt, &linkid, 1); 409 break; 410 case CFCTRL_SRV_VIDEO: 411 cfpkt_extr_head(pkt, &tmp, 1); 412 linkparam.u.video.connid = tmp; 413 if (CFCTRL_ERR_BIT & cmdrsp) 414 break; 415 /* Link ID */ 416 cfpkt_extr_head(pkt, &linkid, 1); 417 break; 418 419 case CFCTRL_SRV_DATAGRAM: 420 cfpkt_extr_head(pkt, &tmp32, 4); 421 linkparam.u.datagram.connid = 422 le32_to_cpu(tmp32); 423 if (CFCTRL_ERR_BIT & cmdrsp) 424 break; 425 /* Link ID */ 426 cfpkt_extr_head(pkt, &linkid, 1); 427 break; 428 case CFCTRL_SRV_RFM: 429 /* Construct a frame, convert 430 * DatagramConnectionID 431 * to network format long and copy it out... 432 */ 433 cfpkt_extr_head(pkt, &tmp32, 4); 434 linkparam.u.rfm.connid = 435 le32_to_cpu(tmp32); 436 cp = (u8 *) linkparam.u.rfm.volume; 437 for (cfpkt_extr_head(pkt, &tmp, 1); 438 cfpkt_more(pkt) && tmp != '\0'; 439 cfpkt_extr_head(pkt, &tmp, 1)) 440 *cp++ = tmp; 441 *cp = '\0'; 442 443 if (CFCTRL_ERR_BIT & cmdrsp) 444 break; 445 /* Link ID */ 446 cfpkt_extr_head(pkt, &linkid, 1); 447 448 break; 449 case CFCTRL_SRV_UTIL: 450 /* Construct a frame, convert 451 * DatagramConnectionID 452 * to network format long and copy it out... 453 */ 454 /* Fifosize KB */ 455 cfpkt_extr_head(pkt, &tmp16, 2); 456 linkparam.u.utility.fifosize_kb = 457 le16_to_cpu(tmp16); 458 /* Fifosize bufs */ 459 cfpkt_extr_head(pkt, &tmp16, 2); 460 linkparam.u.utility.fifosize_bufs = 461 le16_to_cpu(tmp16); 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 cfpkt_extr_head(pkt, &tmp, 1); 470 *cp++ = tmp; 471 } 472 /* Length */ 473 cfpkt_extr_head(pkt, &len, 1); 474 linkparam.u.utility.paramlen = len; 475 /* Param Data */ 476 cp = linkparam.u.utility.params; 477 while (cfpkt_more(pkt) && len--) { 478 cfpkt_extr_head(pkt, &tmp, 1); 479 *cp++ = tmp; 480 } 481 if (CFCTRL_ERR_BIT & cmdrsp) 482 break; 483 /* Link ID */ 484 cfpkt_extr_head(pkt, &linkid, 1); 485 /* Length */ 486 cfpkt_extr_head(pkt, &len, 1); 487 /* Param Data */ 488 cfpkt_extr_head(pkt, ¶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(&cfctrl->info_list_lock); 499 req = cfctrl_remove_req(cfctrl, &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 if (req != NULL) 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