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/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 /* Protocol head room added for CAIF link layer */ 49 int head_room; 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 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 /* Initiate response functions */ 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; 108 out_of_mem: 109 synchronize_rcu(); 110 111 kfree(this->mux); 112 kfree(this->ctrl); 113 kfree(this); 114 return NULL; 115 } 116 117 void 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 } 128 129 static void cfctrl_resp_func(void) 130 { 131 } 132 133 static 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 } 143 144 static void cfctrl_enum_resp(void) 145 { 146 } 147 148 static struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg, 149 enum cfcnfg_phy_preference phy_pref) 150 { 151 /* Try to match with specified preference */ 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 /* Otherwise just return something */ 162 list_for_each_entry_rcu(phy, &cnfg->phys, node) 163 if (phy->up) 164 return &phy->dev_info; 165 166 return NULL; 167 } 168 169 static 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 } 178 179 int 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 cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer); 191 if (servl != NULL) 192 layer_set_up(servl, NULL); 193 } else 194 pr_debug("nothing to disconnect\n"); 195 196 /* Do RCU sync before initiating cleanup */ 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 } 203 EXPORT_SYMBOL(caif_disconnect_client); 204 205 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id) 206 { 207 } 208 209 static 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 }; 216 217 218 static 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 /* In caif protocol low value is high priority */ 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 } 301 302 int caif_connect_client(struct net *net, struct caif_connect_request *conn_req, 303 struct cflayer *adap_layer, int *ifindex, 304 int *proto_head, int *proto_tail) 305 { 306 struct cflayer *frml; 307 struct cfcnfg_phyinfo *phy; 308 int err; 309 struct cfctrl_link_param param; 310 struct cfcnfg *cfg = get_cfcnfg(net); 311 312 rcu_read_lock(); 313 err = caif_connect_req_to_link_param(cfg, conn_req, ¶m); 314 if (err) 315 goto unlock; 316 317 phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid); 318 if (!phy) { 319 err = -ENODEV; 320 goto unlock; 321 } 322 err = -EINVAL; 323 324 if (adap_layer == NULL) { 325 pr_err("adap_layer is zero\n"); 326 goto unlock; 327 } 328 if (adap_layer->receive == NULL) { 329 pr_err("adap_layer->receive is NULL\n"); 330 goto unlock; 331 } 332 if (adap_layer->ctrlcmd == NULL) { 333 pr_err("adap_layer->ctrlcmd == NULL\n"); 334 goto unlock; 335 } 336 337 err = -ENODEV; 338 frml = phy->frm_layer; 339 if (frml == NULL) { 340 pr_err("Specified PHY type does not exist!\n"); 341 goto unlock; 342 } 343 caif_assert(param.phyid == phy->id); 344 caif_assert(phy->frm_layer->id == 345 param.phyid); 346 caif_assert(phy->phy_layer->id == 347 param.phyid); 348 349 *ifindex = phy->ifindex; 350 *proto_tail = 2; 351 *proto_head = protohead[param.linktype] + phy->head_room; 352 353 rcu_read_unlock(); 354 355 /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */ 356 cfctrl_enum_req(cfg->ctrl, param.phyid); 357 return cfctrl_linkup_request(cfg->ctrl, ¶m, adap_layer); 358 359 unlock: 360 rcu_read_unlock(); 361 return err; 362 } 363 EXPORT_SYMBOL(caif_connect_client); 364 365 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id, 366 struct cflayer *adapt_layer) 367 { 368 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) 369 adapt_layer->ctrlcmd(adapt_layer, 370 CAIF_CTRLCMD_INIT_FAIL_RSP, 0); 371 } 372 373 static void 374 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv, 375 u8 phyid, struct cflayer *adapt_layer) 376 { 377 struct cfcnfg *cnfg = container_obj(layer); 378 struct cflayer *servicel = NULL; 379 struct cfcnfg_phyinfo *phyinfo; 380 struct net_device *netdev; 381 382 if (channel_id == 0) { 383 pr_warn("received channel_id zero\n"); 384 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) 385 adapt_layer->ctrlcmd(adapt_layer, 386 CAIF_CTRLCMD_INIT_FAIL_RSP, 0); 387 return; 388 } 389 390 rcu_read_lock(); 391 392 if (adapt_layer == NULL) { 393 pr_debug("link setup response but no client exist, send linkdown back\n"); 394 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL); 395 goto unlock; 396 } 397 398 caif_assert(cnfg != NULL); 399 caif_assert(phyid != 0); 400 401 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); 402 if (phyinfo == NULL) { 403 pr_err("ERROR: Link Layer Device disappeared while connecting\n"); 404 goto unlock; 405 } 406 407 caif_assert(phyinfo != NULL); 408 caif_assert(phyinfo->id == phyid); 409 caif_assert(phyinfo->phy_layer != NULL); 410 caif_assert(phyinfo->phy_layer->id == phyid); 411 412 adapt_layer->id = channel_id; 413 414 switch (serv) { 415 case CFCTRL_SRV_VEI: 416 servicel = cfvei_create(channel_id, &phyinfo->dev_info); 417 break; 418 case CFCTRL_SRV_DATAGRAM: 419 servicel = cfdgml_create(channel_id, 420 &phyinfo->dev_info); 421 break; 422 case CFCTRL_SRV_RFM: 423 netdev = phyinfo->dev_info.dev; 424 servicel = cfrfml_create(channel_id, &phyinfo->dev_info, 425 netdev->mtu); 426 break; 427 case CFCTRL_SRV_UTIL: 428 servicel = cfutill_create(channel_id, &phyinfo->dev_info); 429 break; 430 case CFCTRL_SRV_VIDEO: 431 servicel = cfvidl_create(channel_id, &phyinfo->dev_info); 432 break; 433 case CFCTRL_SRV_DBG: 434 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info); 435 break; 436 default: 437 pr_err("Protocol error. Link setup response - unknown channel type\n"); 438 goto unlock; 439 } 440 if (!servicel) 441 goto unlock; 442 layer_set_dn(servicel, cnfg->mux); 443 cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id); 444 layer_set_up(servicel, adapt_layer); 445 layer_set_dn(adapt_layer, servicel); 446 447 rcu_read_unlock(); 448 449 servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0); 450 return; 451 unlock: 452 rcu_read_unlock(); 453 } 454 455 void 456 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, 457 struct net_device *dev, struct cflayer *phy_layer, 458 enum cfcnfg_phy_preference pref, 459 struct cflayer *link_support, 460 bool fcs, int head_room) 461 { 462 struct cflayer *frml; 463 struct cfcnfg_phyinfo *phyinfo = NULL; 464 int i; 465 u8 phyid; 466 467 mutex_lock(&cnfg->lock); 468 469 /* CAIF protocol allow maximum 6 link-layers */ 470 for (i = 0; i < 7; i++) { 471 phyid = (dev->ifindex + i) & 0x7; 472 if (phyid == 0) 473 continue; 474 if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL) 475 goto got_phyid; 476 } 477 pr_warn("Too many CAIF Link Layers (max 6)\n"); 478 goto out; 479 480 got_phyid: 481 phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC); 482 if (!phyinfo) 483 goto out_err; 484 485 phy_layer->id = phyid; 486 phyinfo->pref = pref; 487 phyinfo->id = phyid; 488 phyinfo->dev_info.id = phyid; 489 phyinfo->dev_info.dev = dev; 490 phyinfo->phy_layer = phy_layer; 491 phyinfo->ifindex = dev->ifindex; 492 phyinfo->head_room = head_room; 493 phyinfo->use_fcs = fcs; 494 495 frml = cffrml_create(phyid, fcs); 496 497 if (!frml) 498 goto out_err; 499 phyinfo->frm_layer = frml; 500 layer_set_up(frml, cnfg->mux); 501 502 if (link_support != NULL) { 503 link_support->id = phyid; 504 layer_set_dn(frml, link_support); 505 layer_set_up(link_support, frml); 506 layer_set_dn(link_support, phy_layer); 507 layer_set_up(phy_layer, link_support); 508 } else { 509 layer_set_dn(frml, phy_layer); 510 layer_set_up(phy_layer, frml); 511 } 512 513 list_add_rcu(&phyinfo->node, &cnfg->phys); 514 out: 515 mutex_unlock(&cnfg->lock); 516 return; 517 518 out_err: 519 kfree(phyinfo); 520 mutex_unlock(&cnfg->lock); 521 } 522 EXPORT_SYMBOL(cfcnfg_add_phy_layer); 523 524 int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer, 525 bool up) 526 { 527 struct cfcnfg_phyinfo *phyinfo; 528 529 rcu_read_lock(); 530 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id); 531 if (phyinfo == NULL) { 532 rcu_read_unlock(); 533 return -ENODEV; 534 } 535 536 if (phyinfo->up == up) { 537 rcu_read_unlock(); 538 return 0; 539 } 540 phyinfo->up = up; 541 542 if (up) { 543 cffrml_hold(phyinfo->frm_layer); 544 cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer, 545 phy_layer->id); 546 } else { 547 cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id); 548 cffrml_put(phyinfo->frm_layer); 549 } 550 551 rcu_read_unlock(); 552 return 0; 553 } 554 EXPORT_SYMBOL(cfcnfg_set_phy_state); 555 556 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer) 557 { 558 struct cflayer *frml, *frml_dn; 559 u16 phyid; 560 struct cfcnfg_phyinfo *phyinfo; 561 562 might_sleep(); 563 564 mutex_lock(&cnfg->lock); 565 566 phyid = phy_layer->id; 567 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); 568 569 if (phyinfo == NULL) { 570 mutex_unlock(&cnfg->lock); 571 return 0; 572 } 573 caif_assert(phyid == phyinfo->id); 574 caif_assert(phy_layer == phyinfo->phy_layer); 575 caif_assert(phy_layer->id == phyid); 576 caif_assert(phyinfo->frm_layer->id == phyid); 577 578 list_del_rcu(&phyinfo->node); 579 synchronize_rcu(); 580 581 /* Fail if reference count is not zero */ 582 if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) { 583 pr_info("Wait for device inuse\n"); 584 list_add_rcu(&phyinfo->node, &cnfg->phys); 585 mutex_unlock(&cnfg->lock); 586 return -EAGAIN; 587 } 588 589 frml = phyinfo->frm_layer; 590 frml_dn = frml->dn; 591 cffrml_set_uplayer(frml, NULL); 592 cffrml_set_dnlayer(frml, NULL); 593 if (phy_layer != frml_dn) { 594 layer_set_up(frml_dn, NULL); 595 layer_set_dn(frml_dn, NULL); 596 } 597 layer_set_up(phy_layer, NULL); 598 599 if (phyinfo->phy_layer != frml_dn) 600 kfree(frml_dn); 601 602 cffrml_free(frml); 603 kfree(phyinfo); 604 mutex_unlock(&cnfg->lock); 605 606 return 0; 607 } 608 EXPORT_SYMBOL(cfcnfg_del_phy_layer); 609