nexmon – Blame information for rev 1

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1 office 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 static 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 static 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  
261 /* special handling of interface event */
262 if (event->code == BRCMF_E_IF) {
263 brcmf_fweh_handle_if_event(drvr, &emsg, event->data);
264 goto event_free;
265 }
266  
267 if (event->code == BRCMF_E_TDLS_PEER_EVENT)
268 ifp = drvr->iflist[0];
269 else
270 ifp = drvr->iflist[emsg.bsscfgidx];
271 err = brcmf_fweh_call_event_handler(ifp, event->code, &emsg,
272 event->data);
273 if (err) {
274 brcmf_err("event handler failed (%d)\n",
275 event->code);
276 err = 0;
277 }
278 event_free:
279 kfree(event);
280 }
281 }
282  
283 /**
284 * brcmf_fweh_p2pdev_setup() - P2P device setup ongoing (or not).
285 *
286 * @ifp: ifp on which setup is taking place or finished.
287 * @ongoing: p2p device setup in progress (or not).
288 */
289 void brcmf_fweh_p2pdev_setup(struct brcmf_if *ifp, bool ongoing)
290 {
291 ifp->drvr->fweh.p2pdev_setup_ongoing = ongoing;
292 }
293  
294 /**
295 * brcmf_fweh_attach() - initialize firmware event handling.
296 *
297 * @drvr: driver information object.
298 */
299 void brcmf_fweh_attach(struct brcmf_pub *drvr)
300 {
301 struct brcmf_fweh_info *fweh = &drvr->fweh;
302 INIT_WORK(&fweh->event_work, brcmf_fweh_event_worker);
303 spin_lock_init(&fweh->evt_q_lock);
304 INIT_LIST_HEAD(&fweh->event_q);
305 }
306  
307 /**
308 * brcmf_fweh_detach() - cleanup firmware event handling.
309 *
310 * @drvr: driver information object.
311 */
312 void brcmf_fweh_detach(struct brcmf_pub *drvr)
313 {
314 struct brcmf_fweh_info *fweh = &drvr->fweh;
315 struct brcmf_if *ifp = brcmf_get_ifp(drvr, 0);
316 s8 eventmask[BRCMF_EVENTING_MASK_LEN];
317  
318 if (ifp) {
319 /* clear all events */
320 memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN);
321 (void)brcmf_fil_iovar_data_set(ifp, "event_msgs",
322 eventmask,
323 BRCMF_EVENTING_MASK_LEN);
324 }
325 /* cancel the worker */
326 cancel_work_sync(&fweh->event_work);
327 WARN_ON(!list_empty(&fweh->event_q));
328 memset(fweh->evt_handler, 0, sizeof(fweh->evt_handler));
329 }
330  
331 /**
332 * brcmf_fweh_register() - register handler for given event code.
333 *
334 * @drvr: driver information object.
335 * @code: event code.
336 * @handler: handler for the given event code.
337 */
338 int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code,
339 brcmf_fweh_handler_t handler)
340 {
341 if (drvr->fweh.evt_handler[code]) {
342 brcmf_err("event code %d already registered\n", code);
343 return -ENOSPC;
344 }
345 drvr->fweh.evt_handler[code] = handler;
346 brcmf_dbg(TRACE, "event handler registered for %s\n",
347 brcmf_fweh_event_name(code));
348 return 0;
349 }
350  
351 /**
352 * brcmf_fweh_unregister() - remove handler for given code.
353 *
354 * @drvr: driver information object.
355 * @code: event code.
356 */
357 void brcmf_fweh_unregister(struct brcmf_pub *drvr,
358 enum brcmf_fweh_event_code code)
359 {
360 brcmf_dbg(TRACE, "event handler cleared for %s\n",
361 brcmf_fweh_event_name(code));
362 drvr->fweh.evt_handler[code] = NULL;
363 }
364  
365 /**
366 * brcmf_fweh_activate_events() - enables firmware events registered.
367 *
368 * @ifp: primary interface object.
369 */
370 int brcmf_fweh_activate_events(struct brcmf_if *ifp)
371 {
372 int i, err;
373 s8 eventmask[BRCMF_EVENTING_MASK_LEN];
374  
375 memset(eventmask, 0, sizeof(eventmask));
376 for (i = 0; i < BRCMF_E_LAST; i++) {
377 if (ifp->drvr->fweh.evt_handler[i]) {
378 brcmf_dbg(EVENT, "enable event %s\n",
379 brcmf_fweh_event_name(i));
380 setbit(eventmask, i);
381 }
382 }
383  
384 /* want to handle IF event as well */
385 brcmf_dbg(EVENT, "enable event IF\n");
386 setbit(eventmask, BRCMF_E_IF);
387  
388 err = brcmf_fil_iovar_data_set(ifp, "event_msgs",
389 eventmask, BRCMF_EVENTING_MASK_LEN);
390 if (err)
391 brcmf_err("Set event_msgs error (%d)\n", err);
392  
393 return err;
394 }
395  
396 /**
397 * brcmf_fweh_process_event() - process skb as firmware event.
398 *
399 * @drvr: driver information object.
400 * @event_packet: event packet to process.
401 *
402 * If the packet buffer contains a firmware event message it will
403 * dispatch the event to a registered handler (using worker).
404 */
405 void brcmf_fweh_process_event(struct brcmf_pub *drvr,
406 struct brcmf_event *event_packet,
407 u32 packet_len)
408 {
409 enum brcmf_fweh_event_code code;
410 struct brcmf_fweh_info *fweh = &drvr->fweh;
411 struct brcmf_fweh_queue_item *event;
412 gfp_t alloc_flag = GFP_KERNEL;
413 void *data;
414 u32 datalen;
415  
416 /* get event info */
417 code = get_unaligned_be32(&event_packet->msg.event_type);
418 datalen = get_unaligned_be32(&event_packet->msg.datalen);
419 data = &event_packet[1];
420  
421 if (code >= BRCMF_E_LAST)
422 return;
423  
424 if (code != BRCMF_E_IF && !fweh->evt_handler[code])
425 return;
426  
427 if (datalen > BRCMF_DCMD_MAXLEN ||
428 datalen + sizeof(*event_packet) > packet_len)
429 return;
430  
431 if (in_interrupt())
432 alloc_flag = GFP_ATOMIC;
433  
434 event = kzalloc(sizeof(*event) + datalen, alloc_flag);
435 if (!event)
436 return;
437  
438 event->code = code;
439 event->ifidx = event_packet->msg.ifidx;
440  
441 /* use memcpy to get aligned event message */
442 memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg));
443 memcpy(event->data, data, datalen);
444 event->datalen = datalen;
445 memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN);
446  
447 brcmf_fweh_queue_event(fweh, event);
448 }