1 /* 2 * Copyright (c) 2012 Broadcom Corporation 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 #include <linux/netdevice.h> 17 18 #include "brcmu_wifi.h" 19 #include "brcmu_utils.h" 20 21 #include "cfg80211.h" 22 #include "core.h" 23 #include "debug.h" 24 #include "tracepoint.h" 25 #include "fwsignal.h" 26 #include "fweh.h" 27 #include "fwil.h" 28 29 /** 30 * struct brcmf_fweh_queue_item - event item on event queue. 31 * 32 * @q: list element for queuing. 33 * @code: event code. 34 * @ifidx: interface index related to this event. 35 * @ifaddr: ethernet address for interface. 36 * @emsg: common parameters of the firmware event message. 37 * @data: event specific data part of the firmware event. 38 */ 39 struct brcmf_fweh_queue_item { 40 struct list_head q; 41 enum brcmf_fweh_event_code code; 42 u8 ifidx; 43 u8 ifaddr[ETH_ALEN]; 44 struct brcmf_event_msg_be emsg; 45 u32 datalen; 46 u8 data[0]; 47 }; 48 49 /** 50 * struct brcmf_fweh_event_name - code, name mapping entry. 51 */ 52 struct brcmf_fweh_event_name { 53 enum brcmf_fweh_event_code code; 54 const char *name; 55 }; 56 57 #ifdef DEBUG 58 #define BRCMF_ENUM_DEF(id, val) \ 59 { val, #id }, 60 61 /* array for mapping code to event name */ 62 static struct brcmf_fweh_event_name fweh_event_names[] = { 63 BRCMF_FWEH_EVENT_ENUM_DEFLIST 64 }; 65 #undef BRCMF_ENUM_DEF 66 67 /** 68 * brcmf_fweh_event_name() - returns name for given event code. 69 * 70 * @code: code to lookup. 71 */ 72 const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code) 73 { 74 int i; 75 for (i = 0; i < ARRAY_SIZE(fweh_event_names); i++) { 76 if (fweh_event_names[i].code == code) 77 return fweh_event_names[i].name; 78 } 79 return "unknown"; 80 } 81 #else 82 const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code) 83 { 84 return "nodebug"; 85 } 86 #endif 87 88 /** 89 * brcmf_fweh_queue_event() - create and queue event. 90 * 91 * @fweh: firmware event handling info. 92 * @event: event queue entry. 93 */ 94 static void brcmf_fweh_queue_event(struct brcmf_fweh_info *fweh, 95 struct brcmf_fweh_queue_item *event) 96 { 97 ulong flags; 98 99 spin_lock_irqsave(&fweh->evt_q_lock, flags); 100 list_add_tail(&event->q, &fweh->event_q); 101 spin_unlock_irqrestore(&fweh->evt_q_lock, flags); 102 schedule_work(&fweh->event_work); 103 } 104 105 static int brcmf_fweh_call_event_handler(struct brcmf_if *ifp, 106 enum brcmf_fweh_event_code code, 107 struct brcmf_event_msg *emsg, 108 void *data) 109 { 110 struct brcmf_fweh_info *fweh; 111 int err = -EINVAL; 112 113 if (ifp) { 114 fweh = &ifp->drvr->fweh; 115 116 /* handle the event if valid interface and handler */ 117 if (fweh->evt_handler[code]) 118 err = fweh->evt_handler[code](ifp, emsg, data); 119 else 120 brcmf_err("unhandled event %d ignored\n", code); 121 } else { 122 brcmf_err("no interface object\n"); 123 } 124 return err; 125 } 126 127 /** 128 * brcmf_fweh_handle_if_event() - handle IF event. 129 * 130 * @drvr: driver information object. 131 * @item: queue entry. 132 * @ifpp: interface object (may change upon ADD action). 133 */ 134 static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr, 135 struct brcmf_event_msg *emsg, 136 void *data) 137 { 138 struct brcmf_if_event *ifevent = data; 139 struct brcmf_if *ifp; 140 bool is_p2pdev; 141 int err = 0; 142 143 brcmf_dbg(EVENT, "action: %u ifidx: %u bsscfgidx: %u flags: %u role: %u\n", 144 ifevent->action, ifevent->ifidx, ifevent->bsscfgidx, 145 ifevent->flags, ifevent->role); 146 147 /* The P2P Device interface event must not be ignored contrary to what 148 * firmware tells us. Older firmware uses p2p noif, with sta role. 149 * This should be accepted when p2pdev_setup is ongoing. TDLS setup will 150 * use the same ifevent and should be ignored. 151 */ 152 is_p2pdev = ((ifevent->flags & BRCMF_E_IF_FLAG_NOIF) && 153 (ifevent->role == BRCMF_E_IF_ROLE_P2P_CLIENT || 154 ((ifevent->role == BRCMF_E_IF_ROLE_STA) && 155 (drvr->fweh.p2pdev_setup_ongoing)))); 156 if (!is_p2pdev && (ifevent->flags & BRCMF_E_IF_FLAG_NOIF)) { 157 brcmf_dbg(EVENT, "event can be ignored\n"); 158 return; 159 } 160 if (ifevent->ifidx >= BRCMF_MAX_IFS) { 161 brcmf_err("invalid interface index: %u\n", ifevent->ifidx); 162 return; 163 } 164 165 ifp = drvr->iflist[ifevent->bsscfgidx]; 166 167 if (ifevent->action == BRCMF_E_IF_ADD) { 168 brcmf_dbg(EVENT, "adding %s (%pM)\n", emsg->ifname, 169 emsg->addr); 170 ifp = brcmf_add_if(drvr, ifevent->bsscfgidx, ifevent->ifidx, 171 is_p2pdev, emsg->ifname, emsg->addr); 172 if (IS_ERR(ifp)) 173 return; 174 if (!is_p2pdev) 175 brcmf_fws_add_interface(ifp); 176 if (!drvr->fweh.evt_handler[BRCMF_E_IF]) 177 if (brcmf_net_attach(ifp, false) < 0) 178 return; 179 } 180 181 if (ifp && ifevent->action == BRCMF_E_IF_CHANGE) 182 brcmf_fws_reset_interface(ifp); 183 184 err = brcmf_fweh_call_event_handler(ifp, emsg->event_code, emsg, data); 185 186 if (ifp && ifevent->action == BRCMF_E_IF_DEL) { 187 bool armed = brcmf_cfg80211_vif_event_armed(drvr->config); 188 189 /* Default handling in case no-one waits for this event */ 190 if (!armed) 191 brcmf_remove_interface(ifp, false); 192 } 193 } 194 195 /** 196 * brcmf_fweh_dequeue_event() - get event from the queue. 197 * 198 * @fweh: firmware event handling info. 199 */ 200 static struct brcmf_fweh_queue_item * 201 brcmf_fweh_dequeue_event(struct brcmf_fweh_info *fweh) 202 { 203 struct brcmf_fweh_queue_item *event = NULL; 204 ulong flags; 205 206 spin_lock_irqsave(&fweh->evt_q_lock, flags); 207 if (!list_empty(&fweh->event_q)) { 208 event = list_first_entry(&fweh->event_q, 209 struct brcmf_fweh_queue_item, q); 210 list_del(&event->q); 211 } 212 spin_unlock_irqrestore(&fweh->evt_q_lock, flags); 213 214 return event; 215 } 216 217 /** 218 * brcmf_fweh_event_worker() - firmware event worker. 219 * 220 * @work: worker object. 221 */ 222 static void brcmf_fweh_event_worker(struct work_struct *work) 223 { 224 struct brcmf_pub *drvr; 225 struct brcmf_if *ifp; 226 struct brcmf_fweh_info *fweh; 227 struct brcmf_fweh_queue_item *event; 228 int err = 0; 229 struct brcmf_event_msg_be *emsg_be; 230 struct brcmf_event_msg emsg; 231 232 fweh = container_of(work, struct brcmf_fweh_info, event_work); 233 drvr = container_of(fweh, struct brcmf_pub, fweh); 234 235 while ((event = brcmf_fweh_dequeue_event(fweh))) { 236 brcmf_dbg(EVENT, "event %s (%u) ifidx %u bsscfg %u addr %pM\n", 237 brcmf_fweh_event_name(event->code), event->code, 238 event->emsg.ifidx, event->emsg.bsscfgidx, 239 event->emsg.addr); 240 241 /* convert event message */ 242 emsg_be = &event->emsg; 243 emsg.version = be16_to_cpu(emsg_be->version); 244 emsg.flags = be16_to_cpu(emsg_be->flags); 245 emsg.event_code = event->code; 246 emsg.status = be32_to_cpu(emsg_be->status); 247 emsg.reason = be32_to_cpu(emsg_be->reason); 248 emsg.auth_type = be32_to_cpu(emsg_be->auth_type); 249 emsg.datalen = be32_to_cpu(emsg_be->datalen); 250 memcpy(emsg.addr, emsg_be->addr, ETH_ALEN); 251 memcpy(emsg.ifname, emsg_be->ifname, sizeof(emsg.ifname)); 252 emsg.ifidx = emsg_be->ifidx; 253 emsg.bsscfgidx = emsg_be->bsscfgidx; 254 255 brcmf_dbg(EVENT, " version %u flags %u status %u reason %u\n", 256 emsg.version, emsg.flags, emsg.status, emsg.reason); 257 brcmf_dbg_hex_dump(BRCMF_EVENT_ON(), event->data, 258 min_t(u32, emsg.datalen, 64), 259 "event payload, len=%d\n", emsg.datalen); 260 if (emsg.datalen > event->datalen) { 261 brcmf_err("event invalid length header=%d, msg=%d\n", 262 event->datalen, emsg.datalen); 263 goto event_free; 264 } 265 266 /* special handling of interface event */ 267 if (event->code == BRCMF_E_IF) { 268 brcmf_fweh_handle_if_event(drvr, &emsg, event->data); 269 goto event_free; 270 } 271 272 if (event->code == BRCMF_E_TDLS_PEER_EVENT) 273 ifp = drvr->iflist[0]; 274 else 275 ifp = drvr->iflist[emsg.bsscfgidx]; 276 err = brcmf_fweh_call_event_handler(ifp, event->code, &emsg, 277 event->data); 278 if (err) { 279 brcmf_err("event handler failed (%d)\n", 280 event->code); 281 err = 0; 282 } 283 event_free: 284 kfree(event); 285 } 286 } 287 288 /** 289 * brcmf_fweh_p2pdev_setup() - P2P device setup ongoing (or not). 290 * 291 * @ifp: ifp on which setup is taking place or finished. 292 * @ongoing: p2p device setup in progress (or not). 293 */ 294 void brcmf_fweh_p2pdev_setup(struct brcmf_if *ifp, bool ongoing) 295 { 296 ifp->drvr->fweh.p2pdev_setup_ongoing = ongoing; 297 } 298 299 /** 300 * brcmf_fweh_attach() - initialize firmware event handling. 301 * 302 * @drvr: driver information object. 303 */ 304 void brcmf_fweh_attach(struct brcmf_pub *drvr) 305 { 306 struct brcmf_fweh_info *fweh = &drvr->fweh; 307 INIT_WORK(&fweh->event_work, brcmf_fweh_event_worker); 308 spin_lock_init(&fweh->evt_q_lock); 309 INIT_LIST_HEAD(&fweh->event_q); 310 } 311 312 /** 313 * brcmf_fweh_detach() - cleanup firmware event handling. 314 * 315 * @drvr: driver information object. 316 */ 317 void brcmf_fweh_detach(struct brcmf_pub *drvr) 318 { 319 struct brcmf_fweh_info *fweh = &drvr->fweh; 320 struct brcmf_if *ifp = brcmf_get_ifp(drvr, 0); 321 s8 eventmask[BRCMF_EVENTING_MASK_LEN]; 322 323 if (ifp) { 324 /* clear all events */ 325 memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN); 326 (void)brcmf_fil_iovar_data_set(ifp, "event_msgs", 327 eventmask, 328 BRCMF_EVENTING_MASK_LEN); 329 } 330 /* cancel the worker */ 331 cancel_work_sync(&fweh->event_work); 332 WARN_ON(!list_empty(&fweh->event_q)); 333 memset(fweh->evt_handler, 0, sizeof(fweh->evt_handler)); 334 } 335 336 /** 337 * brcmf_fweh_register() - register handler for given event code. 338 * 339 * @drvr: driver information object. 340 * @code: event code. 341 * @handler: handler for the given event code. 342 */ 343 int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code, 344 brcmf_fweh_handler_t handler) 345 { 346 if (drvr->fweh.evt_handler[code]) { 347 brcmf_err("event code %d already registered\n", code); 348 return -ENOSPC; 349 } 350 drvr->fweh.evt_handler[code] = handler; 351 brcmf_dbg(TRACE, "event handler registered for %s\n", 352 brcmf_fweh_event_name(code)); 353 return 0; 354 } 355 356 /** 357 * brcmf_fweh_unregister() - remove handler for given code. 358 * 359 * @drvr: driver information object. 360 * @code: event code. 361 */ 362 void brcmf_fweh_unregister(struct brcmf_pub *drvr, 363 enum brcmf_fweh_event_code code) 364 { 365 brcmf_dbg(TRACE, "event handler cleared for %s\n", 366 brcmf_fweh_event_name(code)); 367 drvr->fweh.evt_handler[code] = NULL; 368 } 369 370 /** 371 * brcmf_fweh_activate_events() - enables firmware events registered. 372 * 373 * @ifp: primary interface object. 374 */ 375 int brcmf_fweh_activate_events(struct brcmf_if *ifp) 376 { 377 int i, err; 378 s8 eventmask[BRCMF_EVENTING_MASK_LEN]; 379 380 memset(eventmask, 0, sizeof(eventmask)); 381 for (i = 0; i < BRCMF_E_LAST; i++) { 382 if (ifp->drvr->fweh.evt_handler[i]) { 383 brcmf_dbg(EVENT, "enable event %s\n", 384 brcmf_fweh_event_name(i)); 385 setbit(eventmask, i); 386 } 387 } 388 389 /* want to handle IF event as well */ 390 brcmf_dbg(EVENT, "enable event IF\n"); 391 setbit(eventmask, BRCMF_E_IF); 392 393 err = brcmf_fil_iovar_data_set(ifp, "event_msgs", 394 eventmask, BRCMF_EVENTING_MASK_LEN); 395 if (err) 396 brcmf_err("Set event_msgs error (%d)\n", err); 397 398 return err; 399 } 400 401 /** 402 * brcmf_fweh_process_event() - process skb as firmware event. 403 * 404 * @drvr: driver information object. 405 * @event_packet: event packet to process. 406 * 407 * If the packet buffer contains a firmware event message it will 408 * dispatch the event to a registered handler (using worker). 409 */ 410 void brcmf_fweh_process_event(struct brcmf_pub *drvr, 411 struct brcmf_event *event_packet, 412 u32 packet_len) 413 { 414 enum brcmf_fweh_event_code code; 415 struct brcmf_fweh_info *fweh = &drvr->fweh; 416 struct brcmf_fweh_queue_item *event; 417 gfp_t alloc_flag = GFP_KERNEL; 418 void *data; 419 u32 datalen; 420 421 /* get event info */ 422 code = get_unaligned_be32(&event_packet->msg.event_type); 423 datalen = get_unaligned_be32(&event_packet->msg.datalen); 424 data = &event_packet[1]; 425 426 if (code >= BRCMF_E_LAST) 427 return; 428 429 if (code != BRCMF_E_IF && !fweh->evt_handler[code]) 430 return; 431 432 if (datalen > BRCMF_DCMD_MAXLEN) 433 return; 434 435 if (in_interrupt()) 436 alloc_flag = GFP_ATOMIC; 437 438 event = kzalloc(sizeof(*event) + datalen, alloc_flag); 439 if (!event) 440 return; 441 442 event->code = code; 443 event->ifidx = event_packet->msg.ifidx; 444 445 /* use memcpy to get aligned event message */ 446 memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg)); 447 memcpy(event->data, data, datalen); 448 event->datalen = datalen; 449 memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN); 450 451 brcmf_fweh_queue_event(fweh, event); 452 } 453