1 /* 2 * Copyright (C) ST-Ericsson AB 2010 3 * Author: Sjur Brendeland 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 strlcpy(utility_name, param->u.utility.name, 262 UTILITY_NAME_LENGTH); 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 } 301 return 0; 302 } 303 304 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid, 305 struct cflayer *client) 306 { 307 int ret; 308 struct cfpkt *pkt; 309 struct cfctrl *cfctrl = container_obj(layer); 310 struct cflayer *dn = cfctrl->serv.layer.dn; 311 312 if (!dn) { 313 pr_debug("not able to send link-down request\n"); 314 return -ENODEV; 315 } 316 pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 317 if (!pkt) 318 return -ENOMEM; 319 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY); 320 cfpkt_addbdy(pkt, channelid); 321 init_info(cfpkt_info(pkt), cfctrl); 322 cfpkt_set_prio(pkt, TC_PRIO_CONTROL); 323 ret = 324 dn->transmit(dn, pkt); 325 #ifndef CAIF_NO_LOOP 326 cfctrl->loop_linkused[channelid] = 0; 327 #endif 328 return ret; 329 } 330 331 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer) 332 { 333 struct cfctrl_request_info *p, *tmp; 334 struct cfctrl *ctrl = container_obj(layr); 335 int found = 0; 336 spin_lock_bh(&ctrl->info_list_lock); 337 338 list_for_each_entry_safe(p, tmp, &ctrl->list, list) { 339 if (p->client_layer == adap_layer) { 340 list_del(&p->list); 341 kfree(p); 342 found++; 343 } 344 } 345 346 spin_unlock_bh(&ctrl->info_list_lock); 347 return found; 348 } 349 350 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt) 351 { 352 u8 cmdrsp; 353 u8 cmd; 354 int ret = -1; 355 u8 len; 356 u8 param[255]; 357 u8 linkid = 0; 358 struct cfctrl *cfctrl = container_obj(layer); 359 struct cfctrl_request_info rsp, *req; 360 361 362 cmdrsp = cfpkt_extr_head_u8(pkt); 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 u8 *cp; 381 int i; 382 struct cfctrl_link_param linkparam; 383 memset(&linkparam, 0, sizeof(linkparam)); 384 385 tmp = cfpkt_extr_head_u8(pkt); 386 387 serv = tmp & CFCTRL_SRV_MASK; 388 linkparam.linktype = serv; 389 390 servtype = tmp >> 4; 391 linkparam.chtype = servtype; 392 393 tmp = cfpkt_extr_head_u8(pkt); 394 physlinkid = tmp & 0x07; 395 prio = tmp >> 3; 396 397 linkparam.priority = prio; 398 linkparam.phyid = physlinkid; 399 endpoint = cfpkt_extr_head_u8(pkt); 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 linkid = cfpkt_extr_head_u8(pkt); 409 break; 410 case CFCTRL_SRV_VIDEO: 411 tmp = cfpkt_extr_head_u8(pkt); 412 linkparam.u.video.connid = tmp; 413 if (CFCTRL_ERR_BIT & cmdrsp) 414 break; 415 /* Link ID */ 416 linkid = cfpkt_extr_head_u8(pkt); 417 break; 418 419 case CFCTRL_SRV_DATAGRAM: 420 linkparam.u.datagram.connid = 421 cfpkt_extr_head_u32(pkt); 422 if (CFCTRL_ERR_BIT & cmdrsp) 423 break; 424 /* Link ID */ 425 linkid = cfpkt_extr_head_u8(pkt); 426 break; 427 case CFCTRL_SRV_RFM: 428 /* Construct a frame, convert 429 * DatagramConnectionID 430 * to network format long and copy it out... 431 */ 432 linkparam.u.rfm.connid = 433 cfpkt_extr_head_u32(pkt); 434 cp = (u8 *) linkparam.u.rfm.volume; 435 for (tmp = cfpkt_extr_head_u8(pkt); 436 cfpkt_more(pkt) && tmp != '\0'; 437 tmp = cfpkt_extr_head_u8(pkt)) 438 *cp++ = tmp; 439 *cp = '\0'; 440 441 if (CFCTRL_ERR_BIT & cmdrsp) 442 break; 443 /* Link ID */ 444 linkid = cfpkt_extr_head_u8(pkt); 445 446 break; 447 case CFCTRL_SRV_UTIL: 448 /* Construct a frame, convert 449 * DatagramConnectionID 450 * to network format long and copy it out... 451 */ 452 /* Fifosize KB */ 453 linkparam.u.utility.fifosize_kb = 454 cfpkt_extr_head_u16(pkt); 455 /* Fifosize bufs */ 456 linkparam.u.utility.fifosize_bufs = 457 cfpkt_extr_head_u16(pkt); 458 /* name */ 459 cp = (u8 *) linkparam.u.utility.name; 460 caif_assert(sizeof(linkparam.u.utility.name) 461 >= UTILITY_NAME_LENGTH); 462 for (i = 0; 463 i < UTILITY_NAME_LENGTH 464 && cfpkt_more(pkt); i++) { 465 tmp = cfpkt_extr_head_u8(pkt); 466 *cp++ = tmp; 467 } 468 /* Length */ 469 len = cfpkt_extr_head_u8(pkt); 470 linkparam.u.utility.paramlen = len; 471 /* Param Data */ 472 cp = linkparam.u.utility.params; 473 while (cfpkt_more(pkt) && len--) { 474 tmp = cfpkt_extr_head_u8(pkt); 475 *cp++ = tmp; 476 } 477 if (CFCTRL_ERR_BIT & cmdrsp) 478 break; 479 /* Link ID */ 480 linkid = cfpkt_extr_head_u8(pkt); 481 /* Length */ 482 len = cfpkt_extr_head_u8(pkt); 483 /* Param Data */ 484 cfpkt_extr_head(pkt, ¶m, len); 485 break; 486 default: 487 pr_warn("Request setup, invalid type (%d)\n", 488 serv); 489 goto error; 490 } 491 492 rsp.cmd = cmd; 493 rsp.param = linkparam; 494 spin_lock_bh(&cfctrl->info_list_lock); 495 req = cfctrl_remove_req(cfctrl, &rsp); 496 497 if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) || 498 cfpkt_erroneous(pkt)) { 499 pr_err("Invalid O/E bit or parse error " 500 "on CAIF control channel\n"); 501 cfctrl->res.reject_rsp(cfctrl->serv.layer.up, 502 0, 503 req ? req->client_layer 504 : NULL); 505 } else { 506 cfctrl->res.linksetup_rsp(cfctrl->serv. 507 layer.up, linkid, 508 serv, physlinkid, 509 req ? req-> 510 client_layer : NULL); 511 } 512 513 kfree(req); 514 515 spin_unlock_bh(&cfctrl->info_list_lock); 516 } 517 break; 518 case CFCTRL_CMD_LINK_DESTROY: 519 linkid = cfpkt_extr_head_u8(pkt); 520 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid); 521 break; 522 case CFCTRL_CMD_LINK_ERR: 523 pr_err("Frame Error Indication received\n"); 524 cfctrl->res.linkerror_ind(); 525 break; 526 case CFCTRL_CMD_ENUM: 527 cfctrl->res.enum_rsp(); 528 break; 529 case CFCTRL_CMD_SLEEP: 530 cfctrl->res.sleep_rsp(); 531 break; 532 case CFCTRL_CMD_WAKE: 533 cfctrl->res.wake_rsp(); 534 break; 535 case CFCTRL_CMD_LINK_RECONF: 536 cfctrl->res.restart_rsp(); 537 break; 538 case CFCTRL_CMD_RADIO_SET: 539 cfctrl->res.radioset_rsp(); 540 break; 541 default: 542 pr_err("Unrecognized Control Frame\n"); 543 goto error; 544 } 545 ret = 0; 546 error: 547 cfpkt_destroy(pkt); 548 return ret; 549 } 550 551 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, 552 int phyid) 553 { 554 struct cfctrl *this = container_obj(layr); 555 switch (ctrl) { 556 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND: 557 case CAIF_CTRLCMD_FLOW_OFF_IND: 558 spin_lock_bh(&this->info_list_lock); 559 if (!list_empty(&this->list)) 560 pr_debug("Received flow off in control layer\n"); 561 spin_unlock_bh(&this->info_list_lock); 562 break; 563 case _CAIF_CTRLCMD_PHYIF_DOWN_IND: { 564 struct cfctrl_request_info *p, *tmp; 565 566 /* Find all connect request and report failure */ 567 spin_lock_bh(&this->info_list_lock); 568 list_for_each_entry_safe(p, tmp, &this->list, list) { 569 if (p->param.phyid == phyid) { 570 list_del(&p->list); 571 p->client_layer->ctrlcmd(p->client_layer, 572 CAIF_CTRLCMD_INIT_FAIL_RSP, 573 phyid); 574 kfree(p); 575 } 576 } 577 spin_unlock_bh(&this->info_list_lock); 578 break; 579 } 580 default: 581 break; 582 } 583 } 584 585 #ifndef CAIF_NO_LOOP 586 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt) 587 { 588 static int last_linkid; 589 static int dec; 590 u8 linkid, linktype, tmp; 591 switch (cmd) { 592 case CFCTRL_CMD_LINK_SETUP: 593 spin_lock_bh(&ctrl->loop_linkid_lock); 594 if (!dec) { 595 for (linkid = last_linkid + 1; linkid < 254; linkid++) 596 if (!ctrl->loop_linkused[linkid]) 597 goto found; 598 } 599 dec = 1; 600 for (linkid = last_linkid - 1; linkid > 1; linkid--) 601 if (!ctrl->loop_linkused[linkid]) 602 goto found; 603 spin_unlock_bh(&ctrl->loop_linkid_lock); 604 return -1; 605 found: 606 if (linkid < 10) 607 dec = 0; 608 609 if (!ctrl->loop_linkused[linkid]) 610 ctrl->loop_linkused[linkid] = 1; 611 612 last_linkid = linkid; 613 614 cfpkt_add_trail(pkt, &linkid, 1); 615 spin_unlock_bh(&ctrl->loop_linkid_lock); 616 cfpkt_peek_head(pkt, &linktype, 1); 617 if (linktype == CFCTRL_SRV_UTIL) { 618 tmp = 0x01; 619 cfpkt_add_trail(pkt, &tmp, 1); 620 cfpkt_add_trail(pkt, &tmp, 1); 621 } 622 break; 623 624 case CFCTRL_CMD_LINK_DESTROY: 625 spin_lock_bh(&ctrl->loop_linkid_lock); 626 cfpkt_peek_head(pkt, &linkid, 1); 627 ctrl->loop_linkused[linkid] = 0; 628 spin_unlock_bh(&ctrl->loop_linkid_lock); 629 break; 630 default: 631 break; 632 } 633 return 0; 634 } 635 #endif 636