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/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 /* Information about CAIF physical interfaces held by Config Module in order 27 * to manage physical interfaces 28 */ 29 struct cfcnfg_phyinfo { 30 struct list_head node; 31 bool up; 32 33 /* Pointer to the layer below the MUX (framing layer) */ 34 struct cflayer *frm_layer; 35 /* Pointer to the lowest actual physical layer */ 36 struct cflayer *phy_layer; 37 /* Unique identifier of the physical interface */ 38 unsigned int id; 39 /* Preference of the physical in interface */ 40 enum cfcnfg_phy_preference pref; 41 42 /* Information about the physical device */ 43 struct dev_info dev_info; 44 45 /* Interface index */ 46 int ifindex; 47 48 /* Use Start of frame extension */ 49 bool use_stx; 50 51 /* Use Start of frame checksum */ 52 bool use_fcs; 53 }; 54 55 struct cfcnfg { 56 struct cflayer layer; 57 struct cflayer *ctrl; 58 struct cflayer *mux; 59 struct list_head phys; 60 struct mutex lock; 61 }; 62 63 static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, 64 enum cfctrl_srv serv, u8 phyid, 65 struct cflayer *adapt_layer); 66 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id); 67 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id, 68 struct cflayer *adapt_layer); 69 static void cfctrl_resp_func(void); 70 static void cfctrl_enum_resp(void); 71 72 struct cfcnfg *cfcnfg_create(void) 73 { 74 struct cfcnfg *this; 75 struct cfctrl_rsp *resp; 76 77 might_sleep(); 78 79 /* Initiate this layer */ 80 this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC); 81 if (!this) { 82 pr_warn("Out of memory\n"); 83 return NULL; 84 } 85 this->mux = cfmuxl_create(); 86 if (!this->mux) 87 goto out_of_mem; 88 this->ctrl = cfctrl_create(); 89 if (!this->ctrl) 90 goto out_of_mem; 91 /* Initiate response functions */ 92 resp = cfctrl_get_respfuncs(this->ctrl); 93 resp->enum_rsp = cfctrl_enum_resp; 94 resp->linkerror_ind = cfctrl_resp_func; 95 resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp; 96 resp->sleep_rsp = cfctrl_resp_func; 97 resp->wake_rsp = cfctrl_resp_func; 98 resp->restart_rsp = cfctrl_resp_func; 99 resp->radioset_rsp = cfctrl_resp_func; 100 resp->linksetup_rsp = cfcnfg_linkup_rsp; 101 resp->reject_rsp = cfcnfg_reject_rsp; 102 INIT_LIST_HEAD(&this->phys); 103 104 cfmuxl_set_uplayer(this->mux, this->ctrl, 0); 105 layer_set_dn(this->ctrl, this->mux); 106 layer_set_up(this->ctrl, this); 107 mutex_init(&this->lock); 108 109 return this; 110 out_of_mem: 111 pr_warn("Out of memory\n"); 112 113 synchronize_rcu(); 114 115 kfree(this->mux); 116 kfree(this->ctrl); 117 kfree(this); 118 return NULL; 119 } 120 121 void cfcnfg_remove(struct cfcnfg *cfg) 122 { 123 might_sleep(); 124 if (cfg) { 125 synchronize_rcu(); 126 127 kfree(cfg->mux); 128 cfctrl_remove(cfg->ctrl); 129 kfree(cfg); 130 } 131 } 132 133 static void cfctrl_resp_func(void) 134 { 135 } 136 137 static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo_rcu(struct cfcnfg *cnfg, 138 u8 phyid) 139 { 140 struct cfcnfg_phyinfo *phy; 141 142 list_for_each_entry_rcu(phy, &cnfg->phys, node) 143 if (phy->id == phyid) 144 return phy; 145 return NULL; 146 } 147 148 static void cfctrl_enum_resp(void) 149 { 150 } 151 152 static struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg, 153 enum cfcnfg_phy_preference phy_pref) 154 { 155 /* Try to match with specified preference */ 156 struct cfcnfg_phyinfo *phy; 157 158 list_for_each_entry_rcu(phy, &cnfg->phys, node) { 159 if (phy->up && phy->pref == phy_pref && 160 phy->frm_layer != NULL) 161 162 return &phy->dev_info; 163 } 164 165 /* Otherwise just return something */ 166 list_for_each_entry_rcu(phy, &cnfg->phys, node) 167 if (phy->up) 168 return &phy->dev_info; 169 170 return NULL; 171 } 172 173 static int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi) 174 { 175 struct cfcnfg_phyinfo *phy; 176 177 list_for_each_entry_rcu(phy, &cnfg->phys, node) 178 if (phy->ifindex == ifi && phy->up) 179 return phy->id; 180 return -ENODEV; 181 } 182 183 int caif_disconnect_client(struct net *net, struct cflayer *adap_layer) 184 { 185 u8 channel_id; 186 struct cfcnfg *cfg = get_cfcnfg(net); 187 188 caif_assert(adap_layer != NULL); 189 cfctrl_cancel_req(cfg->ctrl, adap_layer); 190 channel_id = adap_layer->id; 191 if (channel_id != 0) { 192 struct cflayer *servl; 193 servl = cfmuxl_remove_uplayer(cfg->mux, channel_id); 194 if (servl != NULL) 195 layer_set_up(servl, NULL); 196 } else 197 pr_debug("nothing to disconnect\n"); 198 cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer); 199 200 /* Do RCU sync before initiating cleanup */ 201 synchronize_rcu(); 202 if (adap_layer->ctrlcmd != NULL) 203 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0); 204 return 0; 205 206 } 207 EXPORT_SYMBOL(caif_disconnect_client); 208 209 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id) 210 { 211 } 212 213 static const int protohead[CFCTRL_SRV_MASK] = { 214 [CFCTRL_SRV_VEI] = 4, 215 [CFCTRL_SRV_DATAGRAM] = 7, 216 [CFCTRL_SRV_UTIL] = 4, 217 [CFCTRL_SRV_RFM] = 3, 218 [CFCTRL_SRV_DBG] = 3, 219 }; 220 221 222 static int caif_connect_req_to_link_param(struct cfcnfg *cnfg, 223 struct caif_connect_request *s, 224 struct cfctrl_link_param *l) 225 { 226 struct dev_info *dev_info; 227 enum cfcnfg_phy_preference pref; 228 int res; 229 230 memset(l, 0, sizeof(*l)); 231 /* In caif protocol low value is high priority */ 232 l->priority = CAIF_PRIO_MAX - s->priority + 1; 233 234 if (s->ifindex != 0) { 235 res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex); 236 if (res < 0) 237 return res; 238 l->phyid = res; 239 } else { 240 switch (s->link_selector) { 241 case CAIF_LINK_HIGH_BANDW: 242 pref = CFPHYPREF_HIGH_BW; 243 break; 244 case CAIF_LINK_LOW_LATENCY: 245 pref = CFPHYPREF_LOW_LAT; 246 break; 247 default: 248 return -EINVAL; 249 } 250 dev_info = cfcnfg_get_phyid(cnfg, pref); 251 if (dev_info == NULL) 252 return -ENODEV; 253 l->phyid = dev_info->id; 254 } 255 switch (s->protocol) { 256 case CAIFPROTO_AT: 257 l->linktype = CFCTRL_SRV_VEI; 258 l->endpoint = (s->sockaddr.u.at.type >> 2) & 0x3; 259 l->chtype = s->sockaddr.u.at.type & 0x3; 260 break; 261 case CAIFPROTO_DATAGRAM: 262 l->linktype = CFCTRL_SRV_DATAGRAM; 263 l->chtype = 0x00; 264 l->u.datagram.connid = s->sockaddr.u.dgm.connection_id; 265 break; 266 case CAIFPROTO_DATAGRAM_LOOP: 267 l->linktype = CFCTRL_SRV_DATAGRAM; 268 l->chtype = 0x03; 269 l->endpoint = 0x00; 270 l->u.datagram.connid = s->sockaddr.u.dgm.connection_id; 271 break; 272 case CAIFPROTO_RFM: 273 l->linktype = CFCTRL_SRV_RFM; 274 l->u.datagram.connid = s->sockaddr.u.rfm.connection_id; 275 strncpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume, 276 sizeof(l->u.rfm.volume)-1); 277 l->u.rfm.volume[sizeof(l->u.rfm.volume)-1] = 0; 278 break; 279 case CAIFPROTO_UTIL: 280 l->linktype = CFCTRL_SRV_UTIL; 281 l->endpoint = 0x00; 282 l->chtype = 0x00; 283 strncpy(l->u.utility.name, s->sockaddr.u.util.service, 284 sizeof(l->u.utility.name)-1); 285 l->u.utility.name[sizeof(l->u.utility.name)-1] = 0; 286 caif_assert(sizeof(l->u.utility.name) > 10); 287 l->u.utility.paramlen = s->param.size; 288 if (l->u.utility.paramlen > sizeof(l->u.utility.params)) 289 l->u.utility.paramlen = sizeof(l->u.utility.params); 290 291 memcpy(l->u.utility.params, s->param.data, 292 l->u.utility.paramlen); 293 294 break; 295 case CAIFPROTO_DEBUG: 296 l->linktype = CFCTRL_SRV_DBG; 297 l->endpoint = s->sockaddr.u.dbg.service; 298 l->chtype = s->sockaddr.u.dbg.type; 299 break; 300 default: 301 return -EINVAL; 302 } 303 return 0; 304 } 305 306 int caif_connect_client(struct net *net, struct caif_connect_request *conn_req, 307 struct cflayer *adap_layer, int *ifindex, 308 int *proto_head, 309 int *proto_tail) 310 { 311 struct cflayer *frml; 312 struct cfcnfg_phyinfo *phy; 313 int err; 314 struct cfctrl_link_param param; 315 struct cfcnfg *cfg = get_cfcnfg(net); 316 caif_assert(cfg != NULL); 317 318 rcu_read_lock(); 319 err = caif_connect_req_to_link_param(cfg, conn_req, ¶m); 320 if (err) 321 goto unlock; 322 323 phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid); 324 if (!phy) { 325 err = -ENODEV; 326 goto unlock; 327 } 328 err = -EINVAL; 329 330 if (adap_layer == NULL) { 331 pr_err("adap_layer is zero\n"); 332 goto unlock; 333 } 334 if (adap_layer->receive == NULL) { 335 pr_err("adap_layer->receive is NULL\n"); 336 goto unlock; 337 } 338 if (adap_layer->ctrlcmd == NULL) { 339 pr_err("adap_layer->ctrlcmd == NULL\n"); 340 goto unlock; 341 } 342 343 err = -ENODEV; 344 frml = phy->frm_layer; 345 if (frml == NULL) { 346 pr_err("Specified PHY type does not exist!\n"); 347 goto unlock; 348 } 349 caif_assert(param.phyid == phy->id); 350 caif_assert(phy->frm_layer->id == 351 param.phyid); 352 caif_assert(phy->phy_layer->id == 353 param.phyid); 354 355 *ifindex = phy->ifindex; 356 *proto_tail = 2; 357 *proto_head = 358 359 protohead[param.linktype] + (phy->use_stx ? 1 : 0); 360 361 rcu_read_unlock(); 362 363 /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */ 364 cfctrl_enum_req(cfg->ctrl, param.phyid); 365 return cfctrl_linkup_request(cfg->ctrl, ¶m, adap_layer); 366 367 unlock: 368 rcu_read_unlock(); 369 return err; 370 } 371 EXPORT_SYMBOL(caif_connect_client); 372 373 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id, 374 struct cflayer *adapt_layer) 375 { 376 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) 377 adapt_layer->ctrlcmd(adapt_layer, 378 CAIF_CTRLCMD_INIT_FAIL_RSP, 0); 379 } 380 381 static void 382 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv, 383 u8 phyid, struct cflayer *adapt_layer) 384 { 385 struct cfcnfg *cnfg = container_obj(layer); 386 struct cflayer *servicel = NULL; 387 struct cfcnfg_phyinfo *phyinfo; 388 struct net_device *netdev; 389 390 if (channel_id == 0) { 391 pr_warn("received channel_id zero\n"); 392 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) 393 adapt_layer->ctrlcmd(adapt_layer, 394 CAIF_CTRLCMD_INIT_FAIL_RSP, 0); 395 return; 396 } 397 398 rcu_read_lock(); 399 400 if (adapt_layer == NULL) { 401 pr_debug("link setup response but no client exist," 402 "send linkdown back\n"); 403 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL); 404 goto unlock; 405 } 406 407 caif_assert(cnfg != NULL); 408 caif_assert(phyid != 0); 409 410 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); 411 if (phyinfo == NULL) { 412 pr_err("ERROR: Link Layer Device dissapeared" 413 "while connecting\n"); 414 goto unlock; 415 } 416 417 caif_assert(phyinfo != NULL); 418 caif_assert(phyinfo->id == phyid); 419 caif_assert(phyinfo->phy_layer != NULL); 420 caif_assert(phyinfo->phy_layer->id == phyid); 421 422 adapt_layer->id = channel_id; 423 424 switch (serv) { 425 case CFCTRL_SRV_VEI: 426 servicel = cfvei_create(channel_id, &phyinfo->dev_info); 427 break; 428 case CFCTRL_SRV_DATAGRAM: 429 servicel = cfdgml_create(channel_id, 430 &phyinfo->dev_info); 431 break; 432 case CFCTRL_SRV_RFM: 433 netdev = phyinfo->dev_info.dev; 434 servicel = cfrfml_create(channel_id, &phyinfo->dev_info, 435 netdev->mtu); 436 break; 437 case CFCTRL_SRV_UTIL: 438 servicel = cfutill_create(channel_id, &phyinfo->dev_info); 439 break; 440 case CFCTRL_SRV_VIDEO: 441 servicel = cfvidl_create(channel_id, &phyinfo->dev_info); 442 break; 443 case CFCTRL_SRV_DBG: 444 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info); 445 break; 446 default: 447 pr_err("Protocol error. Link setup response " 448 "- unknown channel type\n"); 449 goto unlock; 450 } 451 if (!servicel) { 452 pr_warn("Out of memory\n"); 453 goto unlock; 454 } 455 layer_set_dn(servicel, cnfg->mux); 456 cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id); 457 layer_set_up(servicel, adapt_layer); 458 layer_set_dn(adapt_layer, servicel); 459 460 rcu_read_unlock(); 461 462 servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0); 463 return; 464 unlock: 465 rcu_read_unlock(); 466 } 467 468 void 469 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type, 470 struct net_device *dev, struct cflayer *phy_layer, 471 enum cfcnfg_phy_preference pref, 472 bool fcs, bool stx) 473 { 474 struct cflayer *frml; 475 struct cflayer *phy_driver = NULL; 476 struct cfcnfg_phyinfo *phyinfo; 477 int i; 478 u8 phyid; 479 480 mutex_lock(&cnfg->lock); 481 482 /* CAIF protocol allow maximum 6 link-layers */ 483 for (i = 0; i < 7; i++) { 484 phyid = (dev->ifindex + i) & 0x7; 485 if (phyid == 0) 486 continue; 487 if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL) 488 goto got_phyid; 489 } 490 pr_warn("Too many CAIF Link Layers (max 6)\n"); 491 goto out; 492 493 got_phyid: 494 phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC); 495 496 switch (phy_type) { 497 case CFPHYTYPE_FRAG: 498 phy_driver = 499 cfserl_create(CFPHYTYPE_FRAG, phyid, stx); 500 if (!phy_driver) { 501 pr_warn("Out of memory\n"); 502 goto out; 503 } 504 break; 505 case CFPHYTYPE_CAIF: 506 phy_driver = NULL; 507 break; 508 default: 509 goto out; 510 } 511 phy_layer->id = phyid; 512 phyinfo->pref = pref; 513 phyinfo->id = phyid; 514 phyinfo->dev_info.id = phyid; 515 phyinfo->dev_info.dev = dev; 516 phyinfo->phy_layer = phy_layer; 517 phyinfo->ifindex = dev->ifindex; 518 phyinfo->use_stx = stx; 519 phyinfo->use_fcs = fcs; 520 521 frml = cffrml_create(phyid, fcs); 522 523 if (!frml) { 524 pr_warn("Out of memory\n"); 525 kfree(phyinfo); 526 goto out; 527 } 528 phyinfo->frm_layer = frml; 529 layer_set_up(frml, cnfg->mux); 530 531 if (phy_driver != NULL) { 532 phy_driver->id = phyid; 533 layer_set_dn(frml, phy_driver); 534 layer_set_up(phy_driver, frml); 535 layer_set_dn(phy_driver, phy_layer); 536 layer_set_up(phy_layer, phy_driver); 537 } else { 538 layer_set_dn(frml, phy_layer); 539 layer_set_up(phy_layer, frml); 540 } 541 542 list_add_rcu(&phyinfo->node, &cnfg->phys); 543 out: 544 mutex_unlock(&cnfg->lock); 545 } 546 EXPORT_SYMBOL(cfcnfg_add_phy_layer); 547 548 int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer, 549 bool up) 550 { 551 struct cfcnfg_phyinfo *phyinfo; 552 553 rcu_read_lock(); 554 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id); 555 if (phyinfo == NULL) { 556 rcu_read_unlock(); 557 return -ENODEV; 558 } 559 560 if (phyinfo->up == up) { 561 rcu_read_unlock(); 562 return 0; 563 } 564 phyinfo->up = up; 565 566 if (up) { 567 cffrml_hold(phyinfo->frm_layer); 568 cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer, 569 phy_layer->id); 570 } else { 571 cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id); 572 cffrml_put(phyinfo->frm_layer); 573 } 574 575 rcu_read_unlock(); 576 return 0; 577 } 578 EXPORT_SYMBOL(cfcnfg_set_phy_state); 579 580 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer) 581 { 582 struct cflayer *frml, *frml_dn; 583 u16 phyid; 584 struct cfcnfg_phyinfo *phyinfo; 585 586 might_sleep(); 587 588 mutex_lock(&cnfg->lock); 589 590 phyid = phy_layer->id; 591 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); 592 593 if (phyinfo == NULL) { 594 mutex_unlock(&cnfg->lock); 595 return 0; 596 } 597 caif_assert(phyid == phyinfo->id); 598 caif_assert(phy_layer == phyinfo->phy_layer); 599 caif_assert(phy_layer->id == phyid); 600 caif_assert(phyinfo->frm_layer->id == phyid); 601 602 list_del_rcu(&phyinfo->node); 603 synchronize_rcu(); 604 605 /* Fail if reference count is not zero */ 606 if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) { 607 pr_info("Wait for device inuse\n"); 608 list_add_rcu(&phyinfo->node, &cnfg->phys); 609 mutex_unlock(&cnfg->lock); 610 return -EAGAIN; 611 } 612 613 frml = phyinfo->frm_layer; 614 frml_dn = frml->dn; 615 cffrml_set_uplayer(frml, NULL); 616 cffrml_set_dnlayer(frml, NULL); 617 if (phy_layer != frml_dn) { 618 layer_set_up(frml_dn, NULL); 619 layer_set_dn(frml_dn, NULL); 620 } 621 layer_set_up(phy_layer, NULL); 622 623 if (phyinfo->phy_layer != frml_dn) 624 kfree(frml_dn); 625 626 cffrml_free(frml); 627 kfree(phyinfo); 628 mutex_unlock(&cnfg->lock); 629 630 return 0; 631 } 632 EXPORT_SYMBOL(cfcnfg_del_phy_layer); 633