drivers/net/wireless/brcm80211/brcmfmac/fweh.c

   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 "core.h"
  22 #include "debug.h"
  23 #include "tracepoint.h"
  24 #include "fwsignal.h"
  25 #include "fweh.h"
  26 #include "fwil.h"
  27
  28 /**
  29  * struct brcm_ethhdr - broadcom specific ether header.
  30  *
  31  * @subtype: subtype for this packet.
  32  * @length: TODO: length of appended data.
  33  * @version: version indication.
  34  * @oui: OUI of this packet.
  35  * @usr_subtype: subtype for this OUI.
  36  */
  37 struct brcm_ethhdr {
  38         __be16 subtype;
  39         __be16 length;
  40         u8 version;
  41         u8 oui[3];
  42         __be16 usr_subtype;
  43 } __packed;
  44
  45 struct brcmf_event_msg_be {
  46         __be16 version;
  47         __be16 flags;
  48         __be32 event_type;
  49         __be32 status;
  50         __be32 reason;
  51         __be32 auth_type;
  52         __be32 datalen;
  53         u8 addr[ETH_ALEN];
  54         char ifname[IFNAMSIZ];
  55         u8 ifidx;
  56         u8 bsscfgidx;
  57 } __packed;
  58
  59 /**
  60  * struct brcmf_event - contents of broadcom event packet.
  61  *
  62  * @eth: standard ether header.
  63  * @hdr: broadcom specific ether header.
  64  * @msg: common part of the actual event message.
  65  */
  66 struct brcmf_event {
  67         struct ethhdr eth;
  68         struct brcm_ethhdr hdr;
  69         struct brcmf_event_msg_be msg;
  70 } __packed;
  71
  72 /**
  73  * struct brcmf_fweh_queue_item - event item on event queue.
  74  *
  75  * @q: list element for queuing.
  76  * @code: event code.
  77  * @ifidx: interface index related to this event.
  78  * @ifaddr: ethernet address for interface.
  79  * @emsg: common parameters of the firmware event message.
  80  * @data: event specific data part of the firmware event.
  81  */
  82 struct brcmf_fweh_queue_item {
  83         struct list_head q;
  84         enum brcmf_fweh_event_code code;
  85         u8 ifidx;
  86         u8 ifaddr[ETH_ALEN];
  87         struct brcmf_event_msg_be emsg;
  88         u8 data[0];
  89 };
  90
  91 /**
  92  * struct brcmf_fweh_event_name - code, name mapping entry.
  93  */
  94 struct brcmf_fweh_event_name {
  95         enum brcmf_fweh_event_code code;
  96         const char *name;
  97 };
  98
  99 #ifdef DEBUG
 100 #define BRCMF_ENUM_DEF(id, val) \
 101         { val, #id },
 102
 103 /* array for mapping code to event name */
 104 static struct brcmf_fweh_event_name fweh_event_names[] = {
 105         BRCMF_FWEH_EVENT_ENUM_DEFLIST
 106 };
 107 #undef BRCMF_ENUM_DEF
 108
 109 /**
 110  * brcmf_fweh_event_name() - returns name for given event code.
 111  *
 112  * @code: code to lookup.
 113  */
 114 static const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code)
 115 {
 116         int i;
 117         for (i = 0; i < ARRAY_SIZE(fweh_event_names); i++) {
 118                 if (fweh_event_names[i].code == code)
 119                         return fweh_event_names[i].name;
 120         }
 121         return "unknown";
 122 }
 123 #else
 124 static const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code)
 125 {
 126         return "nodebug";
 127 }
 128 #endif
 129
 130 /**
 131  * brcmf_fweh_queue_event() - create and queue event.
 132  *
 133  * @fweh: firmware event handling info.
 134  * @event: event queue entry.
 135  */
 136 static void brcmf_fweh_queue_event(struct brcmf_fweh_info *fweh,
 137                                    struct brcmf_fweh_queue_item *event)
 138 {
 139         ulong flags;
 140
 141         spin_lock_irqsave(&fweh->evt_q_lock, flags);
 142         list_add_tail(&event->q, &fweh->event_q);
 143         spin_unlock_irqrestore(&fweh->evt_q_lock, flags);
 144         schedule_work(&fweh->event_work);
 145 }
 146
 147 static int brcmf_fweh_call_event_handler(struct brcmf_if *ifp,
 148                                          enum brcmf_fweh_event_code code,
 149                                          struct brcmf_event_msg *emsg,
 150                                          void *data)
 151 {
 152         struct brcmf_fweh_info *fweh;
 153         int err = -EINVAL;
 154
 155         if (ifp) {
 156                 fweh = &ifp->drvr->fweh;
 157
 158                 /* handle the event if valid interface and handler */
 159                 if (fweh->evt_handler[code])
 160                         err = fweh->evt_handler[code](ifp, emsg, data);
 161                 else
 162                         brcmf_err("unhandled event %d ignored\n", code);
 163         } else {
 164                 brcmf_err("no interface object\n");
 165         }
 166         return err;
 167 }
 168
 169 /**
 170  * brcmf_fweh_handle_if_event() - handle IF event.
 171  *
 172  * @drvr: driver information object.
 173  * @item: queue entry.
 174  * @ifpp: interface object (may change upon ADD action).
 175  */
 176 static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr,
 177                                        struct brcmf_event_msg *emsg,
 178                                        void *data)
 179 {
 180         struct brcmf_if_event *ifevent = data;
 181         struct brcmf_if *ifp;
 182         int err = 0;
 183
 184         brcmf_dbg(EVENT, "action: %u idx: %u bsscfg: %u flags: %u role: %u\n",
 185                   ifevent->action, ifevent->ifidx, ifevent->bssidx,
 186                   ifevent->flags, ifevent->role);
 187
 188         /* The P2P Device interface event must not be ignored
 189          * contrary to what firmware tells us. The only way to
 190          * distinguish the P2P Device is by looking at the ifidx
 191          * and bssidx received.
 192          */
 193         if (!(ifevent->ifidx == 0 && ifevent->bssidx == 1) &&
 194             (ifevent->flags & BRCMF_E_IF_FLAG_NOIF)) {
 195                 brcmf_dbg(EVENT, "event can be ignored\n");
 196                 return;
 197         }
 198         if (ifevent->ifidx >= BRCMF_MAX_IFS) {
 199                 brcmf_err("invalid interface index: %u\n",
 200                           ifevent->ifidx);
 201                 return;
 202         }
 203
 204         ifp = drvr->iflist[ifevent->bssidx];
 205
 206         if (ifevent->action == BRCMF_E_IF_ADD) {
 207                 brcmf_dbg(EVENT, "adding %s (%pM)\n", emsg->ifname,
 208                           emsg->addr);
 209                 ifp = brcmf_add_if(drvr, ifevent->bssidx, ifevent->ifidx,
 210                                    emsg->ifname, emsg->addr);
 211                 if (IS_ERR(ifp))
 212                         return;
 213                 brcmf_fws_add_interface(ifp);
 214                 if (!drvr->fweh.evt_handler[BRCMF_E_IF])
 215                         if (brcmf_net_attach(ifp, false) < 0)
 216                                 return;
 217         }
 218
 219         if (ifp && ifevent->action == BRCMF_E_IF_CHANGE)
 220                 brcmf_fws_reset_interface(ifp);
 221
 222         err = brcmf_fweh_call_event_handler(ifp, emsg->event_code, emsg, data);
 223
 224         if (ifp && ifevent->action == BRCMF_E_IF_DEL)
 225                 brcmf_remove_interface(drvr, ifevent->bssidx);
 226 }
 227
 228 /**
 229  * brcmf_fweh_dequeue_event() - get event from the queue.
 230  *
 231  * @fweh: firmware event handling info.
 232  */
 233 static struct brcmf_fweh_queue_item *
 234 brcmf_fweh_dequeue_event(struct brcmf_fweh_info *fweh)
 235 {
 236         struct brcmf_fweh_queue_item *event = NULL;
 237         ulong flags;
 238
 239         spin_lock_irqsave(&fweh->evt_q_lock, flags);
 240         if (!list_empty(&fweh->event_q)) {
 241                 event = list_first_entry(&fweh->event_q,
 242                                          struct brcmf_fweh_queue_item, q);
 243                 list_del(&event->q);
 244         }
 245         spin_unlock_irqrestore(&fweh->evt_q_lock, flags);
 246
 247         return event;
 248 }
 249
 250 /**
 251  * brcmf_fweh_event_worker() - firmware event worker.
 252  *
 253  * @work: worker object.
 254  */
 255 static void brcmf_fweh_event_worker(struct work_struct *work)
 256 {
 257         struct brcmf_pub *drvr;
 258         struct brcmf_if *ifp;
 259         struct brcmf_fweh_info *fweh;
 260         struct brcmf_fweh_queue_item *event;
 261         int err = 0;
 262         struct brcmf_event_msg_be *emsg_be;
 263         struct brcmf_event_msg emsg;
 264
 265         fweh = container_of(work, struct brcmf_fweh_info, event_work);
 266         drvr = container_of(fweh, struct brcmf_pub, fweh);
 267
 268         while ((event = brcmf_fweh_dequeue_event(fweh))) {
 269                 brcmf_dbg(EVENT, "event %s (%u) ifidx %u bsscfg %u addr %pM\n",
 270                           brcmf_fweh_event_name(event->code), event->code,
 271                           event->emsg.ifidx, event->emsg.bsscfgidx,
 272                           event->emsg.addr);
 273
 274                 /* convert event message */
 275                 emsg_be = &event->emsg;
 276                 emsg.version = be16_to_cpu(emsg_be->version);
 277                 emsg.flags = be16_to_cpu(emsg_be->flags);
 278                 emsg.event_code = event->code;
 279                 emsg.status = be32_to_cpu(emsg_be->status);
 280                 emsg.reason = be32_to_cpu(emsg_be->reason);
 281                 emsg.auth_type = be32_to_cpu(emsg_be->auth_type);
 282                 emsg.datalen = be32_to_cpu(emsg_be->datalen);
 283                 memcpy(emsg.addr, emsg_be->addr, ETH_ALEN);
 284                 memcpy(emsg.ifname, emsg_be->ifname, sizeof(emsg.ifname));
 285                 emsg.ifidx = emsg_be->ifidx;
 286                 emsg.bsscfgidx = emsg_be->bsscfgidx;
 287
 288                 brcmf_dbg(EVENT, "  version %u flags %u status %u reason %u\n",
 289                           emsg.version, emsg.flags, emsg.status, emsg.reason);
 290                 brcmf_dbg_hex_dump(BRCMF_EVENT_ON(), event->data,
 291                                    min_t(u32, emsg.datalen, 64),
 292                                    "event payload, len=%d\n", emsg.datalen);
 293
 294                 /* special handling of interface event */
 295                 if (event->code == BRCMF_E_IF) {
 296                         brcmf_fweh_handle_if_event(drvr, &emsg, event->data);
 297                         goto event_free;
 298                 }
 299
 300                 if ((event->code == BRCMF_E_TDLS_PEER_EVENT) &&
 301                     (emsg.bsscfgidx == 1))
 302                         ifp = drvr->iflist[0];
 303                 else
 304                         ifp = drvr->iflist[emsg.bsscfgidx];
 305                 err = brcmf_fweh_call_event_handler(ifp, event->code, &emsg,
 306                                                     event->data);
 307                 if (err) {
 308                         brcmf_err("event handler failed (%d)\n",
 309                                   event->code);
 310                         err = 0;
 311                 }
 312 event_free:
 313                 kfree(event);
 314         }
 315 }
 316
 317 /**
 318  * brcmf_fweh_attach() - initialize firmware event handling.
 319  *
 320  * @drvr: driver information object.
 321  */
 322 void brcmf_fweh_attach(struct brcmf_pub *drvr)
 323 {
 324         struct brcmf_fweh_info *fweh = &drvr->fweh;
 325         INIT_WORK(&fweh->event_work, brcmf_fweh_event_worker);
 326         spin_lock_init(&fweh->evt_q_lock);
 327         INIT_LIST_HEAD(&fweh->event_q);
 328 }
 329
 330 /**
 331  * brcmf_fweh_detach() - cleanup firmware event handling.
 332  *
 333  * @drvr: driver information object.
 334  */
 335 void brcmf_fweh_detach(struct brcmf_pub *drvr)
 336 {
 337         struct brcmf_fweh_info *fweh = &drvr->fweh;
 338         struct brcmf_if *ifp = drvr->iflist[0];
 339         s8 eventmask[BRCMF_EVENTING_MASK_LEN];
 340
 341         if (ifp) {
 342                 /* clear all events */
 343                 memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN);
 344                 (void)brcmf_fil_iovar_data_set(ifp, "event_msgs",
 345                                                eventmask,
 346                                                BRCMF_EVENTING_MASK_LEN);
 347         }
 348         /* cancel the worker */
 349         cancel_work_sync(&fweh->event_work);
 350         WARN_ON(!list_empty(&fweh->event_q));
 351         memset(fweh->evt_handler, 0, sizeof(fweh->evt_handler));
 352 }
 353
 354 /**
 355  * brcmf_fweh_register() - register handler for given event code.
 356  *
 357  * @drvr: driver information object.
 358  * @code: event code.
 359  * @handler: handler for the given event code.
 360  */
 361 int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code,
 362                         brcmf_fweh_handler_t handler)
 363 {
 364         if (drvr->fweh.evt_handler[code]) {
 365                 brcmf_err("event code %d already registered\n", code);
 366                 return -ENOSPC;
 367         }
 368         drvr->fweh.evt_handler[code] = handler;
 369         brcmf_dbg(TRACE, "event handler registered for %s\n",
 370                   brcmf_fweh_event_name(code));
 371         return 0;
 372 }
 373
 374 /**
 375  * brcmf_fweh_unregister() - remove handler for given code.
 376  *
 377  * @drvr: driver information object.
 378  * @code: event code.
 379  */
 380 void brcmf_fweh_unregister(struct brcmf_pub *drvr,
 381                            enum brcmf_fweh_event_code code)
 382 {
 383         brcmf_dbg(TRACE, "event handler cleared for %s\n",
 384                   brcmf_fweh_event_name(code));
 385         drvr->fweh.evt_handler[code] = NULL;
 386 }
 387
 388 /**
 389  * brcmf_fweh_activate_events() - enables firmware events registered.
 390  *
 391  * @ifp: primary interface object.
 392  */
 393 int brcmf_fweh_activate_events(struct brcmf_if *ifp)
 394 {
 395         int i, err;
 396         s8 eventmask[BRCMF_EVENTING_MASK_LEN];
 397
 398         for (i = 0; i < BRCMF_E_LAST; i++) {
 399                 if (ifp->drvr->fweh.evt_handler[i]) {
 400                         brcmf_dbg(EVENT, "enable event %s\n",
 401                                   brcmf_fweh_event_name(i));
 402                         setbit(eventmask, i);
 403                 }
 404         }
 405
 406         /* want to handle IF event as well */
 407         brcmf_dbg(EVENT, "enable event IF\n");
 408         setbit(eventmask, BRCMF_E_IF);
 409
 410         err = brcmf_fil_iovar_data_set(ifp, "event_msgs",
 411                                        eventmask, BRCMF_EVENTING_MASK_LEN);
 412         if (err)
 413                 brcmf_err("Set event_msgs error (%d)\n", err);
 414
 415         return err;
 416 }
 417
 418 /**
 419  * brcmf_fweh_process_event() - process skb as firmware event.
 420  *
 421  * @drvr: driver information object.
 422  * @event_packet: event packet to process.
 423  *
 424  * If the packet buffer contains a firmware event message it will
 425  * dispatch the event to a registered handler (using worker).
 426  */
 427 void brcmf_fweh_process_event(struct brcmf_pub *drvr,
 428                               struct brcmf_event *event_packet)
 429 {
 430         enum brcmf_fweh_event_code code;
 431         struct brcmf_fweh_info *fweh = &drvr->fweh;
 432         struct brcmf_fweh_queue_item *event;
 433         gfp_t alloc_flag = GFP_KERNEL;
 434         void *data;
 435         u32 datalen;
 436
 437         /* get event info */
 438         code = get_unaligned_be32(&event_packet->msg.event_type);
 439         datalen = get_unaligned_be32(&event_packet->msg.datalen);
 440         data = &event_packet[1];
 441
 442         if (code >= BRCMF_E_LAST)
 443                 return;
 444
 445         if (code != BRCMF_E_IF && !fweh->evt_handler[code])
 446                 return;
 447
 448         if (in_interrupt())
 449                 alloc_flag = GFP_ATOMIC;
 450
 451         event = kzalloc(sizeof(*event) + datalen, alloc_flag);
 452         if (!event)
 453                 return;
 454
 455         event->code = code;
 456         event->ifidx = event_packet->msg.ifidx;
 457
 458         /* use memcpy to get aligned event message */
 459         memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg));
 460         memcpy(event->data, data, datalen);
 461         memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN);
 462
 463         brcmf_fweh_queue_event(fweh, event);
 464 }