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/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 strscpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume, 272 sizeof(l->u.rfm.volume)); 273 break; 274 case CAIFPROTO_UTIL: 275 l->linktype = CFCTRL_SRV_UTIL; 276 l->endpoint = 0x00; 277 l->chtype = 0x00; 278 strscpy(l->u.utility.name, s->sockaddr.u.util.service, 279 sizeof(l->u.utility.name)); 280 caif_assert(sizeof(l->u.utility.name) > 10); 281 l->u.utility.paramlen = s->param.size; 282 if (l->u.utility.paramlen > sizeof(l->u.utility.params)) 283 l->u.utility.paramlen = sizeof(l->u.utility.params); 284 285 memcpy(l->u.utility.params, s->param.data, 286 l->u.utility.paramlen); 287 288 break; 289 case CAIFPROTO_DEBUG: 290 l->linktype = CFCTRL_SRV_DBG; 291 l->endpoint = s->sockaddr.u.dbg.service; 292 l->chtype = s->sockaddr.u.dbg.type; 293 break; 294 default: 295 return -EINVAL; 296 } 297 return 0; 298 } 299 300 int caif_connect_client(struct net *net, struct caif_connect_request *conn_req, 301 struct cflayer *adap_layer, int *ifindex, 302 int *proto_head, int *proto_tail) 303 { 304 struct cflayer *frml; 305 struct cfcnfg_phyinfo *phy; 306 int err; 307 struct cfctrl_link_param param; 308 struct cfcnfg *cfg = get_cfcnfg(net); 309 310 rcu_read_lock(); 311 err = caif_connect_req_to_link_param(cfg, conn_req, ¶m); 312 if (err) 313 goto unlock; 314 315 phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid); 316 if (!phy) { 317 err = -ENODEV; 318 goto unlock; 319 } 320 err = -EINVAL; 321 322 if (adap_layer == NULL) { 323 pr_err("adap_layer is zero\n"); 324 goto unlock; 325 } 326 if (adap_layer->receive == NULL) { 327 pr_err("adap_layer->receive is NULL\n"); 328 goto unlock; 329 } 330 if (adap_layer->ctrlcmd == NULL) { 331 pr_err("adap_layer->ctrlcmd == NULL\n"); 332 goto unlock; 333 } 334 335 err = -ENODEV; 336 frml = phy->frm_layer; 337 if (frml == NULL) { 338 pr_err("Specified PHY type does not exist!\n"); 339 goto unlock; 340 } 341 caif_assert(param.phyid == phy->id); 342 caif_assert(phy->frm_layer->id == 343 param.phyid); 344 caif_assert(phy->phy_layer->id == 345 param.phyid); 346 347 *ifindex = phy->ifindex; 348 *proto_tail = 2; 349 *proto_head = protohead[param.linktype] + phy->head_room; 350 351 rcu_read_unlock(); 352 353 /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */ 354 cfctrl_enum_req(cfg->ctrl, param.phyid); 355 return cfctrl_linkup_request(cfg->ctrl, ¶m, adap_layer); 356 357 unlock: 358 rcu_read_unlock(); 359 return err; 360 } 361 EXPORT_SYMBOL(caif_connect_client); 362 363 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id, 364 struct cflayer *adapt_layer) 365 { 366 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) 367 adapt_layer->ctrlcmd(adapt_layer, 368 CAIF_CTRLCMD_INIT_FAIL_RSP, 0); 369 } 370 371 static void 372 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv, 373 u8 phyid, struct cflayer *adapt_layer) 374 { 375 struct cfcnfg *cnfg = container_obj(layer); 376 struct cflayer *servicel = NULL; 377 struct cfcnfg_phyinfo *phyinfo; 378 struct net_device *netdev; 379 380 if (channel_id == 0) { 381 pr_warn("received channel_id zero\n"); 382 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) 383 adapt_layer->ctrlcmd(adapt_layer, 384 CAIF_CTRLCMD_INIT_FAIL_RSP, 0); 385 return; 386 } 387 388 rcu_read_lock(); 389 390 if (adapt_layer == NULL) { 391 pr_debug("link setup response but no client exist, send linkdown back\n"); 392 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL); 393 goto unlock; 394 } 395 396 caif_assert(cnfg != NULL); 397 caif_assert(phyid != 0); 398 399 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); 400 if (phyinfo == NULL) { 401 pr_err("ERROR: Link Layer Device disappeared while connecting\n"); 402 goto unlock; 403 } 404 405 caif_assert(phyinfo != NULL); 406 caif_assert(phyinfo->id == phyid); 407 caif_assert(phyinfo->phy_layer != NULL); 408 caif_assert(phyinfo->phy_layer->id == phyid); 409 410 adapt_layer->id = channel_id; 411 412 switch (serv) { 413 case CFCTRL_SRV_VEI: 414 servicel = cfvei_create(channel_id, &phyinfo->dev_info); 415 break; 416 case CFCTRL_SRV_DATAGRAM: 417 servicel = cfdgml_create(channel_id, 418 &phyinfo->dev_info); 419 break; 420 case CFCTRL_SRV_RFM: 421 netdev = phyinfo->dev_info.dev; 422 servicel = cfrfml_create(channel_id, &phyinfo->dev_info, 423 netdev->mtu); 424 break; 425 case CFCTRL_SRV_UTIL: 426 servicel = cfutill_create(channel_id, &phyinfo->dev_info); 427 break; 428 case CFCTRL_SRV_VIDEO: 429 servicel = cfvidl_create(channel_id, &phyinfo->dev_info); 430 break; 431 case CFCTRL_SRV_DBG: 432 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info); 433 break; 434 default: 435 pr_err("Protocol error. Link setup response - unknown channel type\n"); 436 goto unlock; 437 } 438 if (!servicel) 439 goto unlock; 440 layer_set_dn(servicel, cnfg->mux); 441 cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id); 442 layer_set_up(servicel, adapt_layer); 443 layer_set_dn(adapt_layer, servicel); 444 445 rcu_read_unlock(); 446 447 servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0); 448 return; 449 unlock: 450 rcu_read_unlock(); 451 } 452 453 int 454 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, 455 struct net_device *dev, struct cflayer *phy_layer, 456 enum cfcnfg_phy_preference pref, 457 struct cflayer *link_support, 458 bool fcs, int head_room) 459 { 460 struct cflayer *frml; 461 struct cfcnfg_phyinfo *phyinfo = NULL; 462 int i, res = 0; 463 u8 phyid; 464 465 mutex_lock(&cnfg->lock); 466 467 /* CAIF protocol allow maximum 6 link-layers */ 468 for (i = 0; i < 7; i++) { 469 phyid = (dev->ifindex + i) & 0x7; 470 if (phyid == 0) 471 continue; 472 if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL) 473 goto got_phyid; 474 } 475 pr_warn("Too many CAIF Link Layers (max 6)\n"); 476 res = -EEXIST; 477 goto out; 478 479 got_phyid: 480 phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC); 481 if (!phyinfo) { 482 res = -ENOMEM; 483 goto out; 484 } 485 486 phy_layer->id = phyid; 487 phyinfo->pref = pref; 488 phyinfo->id = phyid; 489 phyinfo->dev_info.id = phyid; 490 phyinfo->dev_info.dev = dev; 491 phyinfo->phy_layer = phy_layer; 492 phyinfo->ifindex = dev->ifindex; 493 phyinfo->head_room = head_room; 494 phyinfo->use_fcs = fcs; 495 496 frml = cffrml_create(phyid, fcs); 497 498 if (!frml) { 499 res = -ENOMEM; 500 goto out_err; 501 } 502 phyinfo->frm_layer = frml; 503 layer_set_up(frml, cnfg->mux); 504 505 if (link_support != NULL) { 506 link_support->id = phyid; 507 layer_set_dn(frml, link_support); 508 layer_set_up(link_support, frml); 509 layer_set_dn(link_support, phy_layer); 510 layer_set_up(phy_layer, link_support); 511 } else { 512 layer_set_dn(frml, phy_layer); 513 layer_set_up(phy_layer, frml); 514 } 515 516 list_add_rcu(&phyinfo->node, &cnfg->phys); 517 out: 518 mutex_unlock(&cnfg->lock); 519 return res; 520 521 out_err: 522 kfree(phyinfo); 523 mutex_unlock(&cnfg->lock); 524 return res; 525 } 526 EXPORT_SYMBOL(cfcnfg_add_phy_layer); 527 528 int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer, 529 bool up) 530 { 531 struct cfcnfg_phyinfo *phyinfo; 532 533 rcu_read_lock(); 534 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id); 535 if (phyinfo == NULL) { 536 rcu_read_unlock(); 537 return -ENODEV; 538 } 539 540 if (phyinfo->up == up) { 541 rcu_read_unlock(); 542 return 0; 543 } 544 phyinfo->up = up; 545 546 if (up) { 547 cffrml_hold(phyinfo->frm_layer); 548 cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer, 549 phy_layer->id); 550 } else { 551 cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id); 552 cffrml_put(phyinfo->frm_layer); 553 } 554 555 rcu_read_unlock(); 556 return 0; 557 } 558 EXPORT_SYMBOL(cfcnfg_set_phy_state); 559 560 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer) 561 { 562 struct cflayer *frml, *frml_dn; 563 u16 phyid; 564 struct cfcnfg_phyinfo *phyinfo; 565 566 might_sleep(); 567 568 mutex_lock(&cnfg->lock); 569 570 phyid = phy_layer->id; 571 phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); 572 573 if (phyinfo == NULL) { 574 mutex_unlock(&cnfg->lock); 575 return 0; 576 } 577 caif_assert(phyid == phyinfo->id); 578 caif_assert(phy_layer == phyinfo->phy_layer); 579 caif_assert(phy_layer->id == phyid); 580 caif_assert(phyinfo->frm_layer->id == phyid); 581 582 list_del_rcu(&phyinfo->node); 583 synchronize_rcu(); 584 585 /* Fail if reference count is not zero */ 586 if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) { 587 pr_info("Wait for device inuse\n"); 588 list_add_rcu(&phyinfo->node, &cnfg->phys); 589 mutex_unlock(&cnfg->lock); 590 return -EAGAIN; 591 } 592 593 frml = phyinfo->frm_layer; 594 frml_dn = frml->dn; 595 cffrml_set_uplayer(frml, NULL); 596 cffrml_set_dnlayer(frml, NULL); 597 if (phy_layer != frml_dn) { 598 layer_set_up(frml_dn, NULL); 599 layer_set_dn(frml_dn, NULL); 600 } 601 layer_set_up(phy_layer, NULL); 602 603 if (phyinfo->phy_layer != frml_dn) 604 kfree(frml_dn); 605 606 cffrml_free(frml); 607 kfree(phyinfo); 608 mutex_unlock(&cnfg->lock); 609 610 return 0; 611 } 612 EXPORT_SYMBOL(cfcnfg_del_phy_layer); 613