1 /******************************************************************************
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
8 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
33 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 *****************************************************************************/
64 #include <linux/jiffies.h>
65 #include <net/mac80211.h>
67 #include "iwl-notif-wait.h"
68 #include "iwl-trans.h"
70 #include "time-event.h"
75 /* A TimeUnit is 1024 microsecond */
76 #define TU_TO_JIFFIES(_tu) (usecs_to_jiffies((_tu) * 1024))
77 #define MSEC_TO_TU(_msec) (_msec*1000/1024)
79 /* For ROC use a TE type which has priority high enough to be scheduled when
80 * there is a concurrent BSS or GO/AP. Currently, use a TE type that has
81 * priority similar to the TE priority used for action scans by the FW.
82 * TODO: This needs to be changed, based on the reason for the ROC, i.e., use
83 * TE_P2P_DEVICE_DISCOVERABLE for remain on channel without mgmt skb, and use
84 * TE_P2P_DEVICE_ACTION_SCAN
86 #define IWL_MVM_ROC_TE_TYPE TE_P2P_DEVICE_ACTION_SCAN
88 void iwl_mvm_te_clear_data(struct iwl_mvm
*mvm
,
89 struct iwl_mvm_time_event_data
*te_data
)
91 lockdep_assert_held(&mvm
->time_event_lock
);
93 if (te_data
->id
== TE_MAX
)
96 list_del(&te_data
->list
);
97 te_data
->running
= false;
103 void iwl_mvm_roc_done_wk(struct work_struct
*wk
)
105 struct iwl_mvm
*mvm
= container_of(wk
, struct iwl_mvm
, roc_done_wk
);
110 * Flush the offchannel queue -- this is called when the time
111 * event finishes or is cancelled, so that frames queued for it
112 * won't get stuck on the queue and be transmitted in the next
114 * We have to send the command asynchronously since this cannot
115 * be under the mutex for locking reasons, but that's not an
116 * issue as it will have to complete before the next command is
117 * executed, and a new time event means a new command.
119 iwl_mvm_flush_tx_path(mvm
, BIT(IWL_OFFCHANNEL_QUEUE
), false);
122 static void iwl_mvm_roc_finished(struct iwl_mvm
*mvm
)
125 * First, clear the ROC_RUNNING status bit. This will cause the TX
126 * path to drop offchannel transmissions. That would also be done
127 * by mac80211, but it is racy, in particular in the case that the
128 * time event actually completed in the firmware (which is handled
129 * in iwl_mvm_te_handle_notif).
131 clear_bit(IWL_MVM_STATUS_ROC_RUNNING
, &mvm
->status
);
134 * Of course, our status bit is just as racy as mac80211, so in
135 * addition, fire off the work struct which will drop all frames
136 * from the hardware queues that made it through the race. First
137 * it will of course synchronize the TX path to make sure that
138 * any *new* TX will be rejected.
140 schedule_work(&mvm
->roc_done_wk
);
144 * Handles a FW notification for an event that is known to the driver.
146 * @mvm: the mvm component
147 * @te_data: the time event data
148 * @notif: the notification data corresponding the time event data.
150 static void iwl_mvm_te_handle_notif(struct iwl_mvm
*mvm
,
151 struct iwl_mvm_time_event_data
*te_data
,
152 struct iwl_time_event_notif
*notif
)
154 lockdep_assert_held(&mvm
->time_event_lock
);
156 IWL_DEBUG_TE(mvm
, "Handle time event notif - UID = 0x%x action %d\n",
157 le32_to_cpu(notif
->unique_id
),
158 le32_to_cpu(notif
->action
));
161 * The FW sends the start/end time event notifications even for events
162 * that it fails to schedule. This is indicated in the status field of
163 * the notification. This happens in cases that the scheduler cannot
164 * find a schedule that can handle the event (for example requesting a
165 * P2P Device discoveribility, while there are other higher priority
166 * events in the system).
168 WARN_ONCE(!le32_to_cpu(notif
->status
),
169 "Failed to schedule time event\n");
171 if (le32_to_cpu(notif
->action
) == TE_NOTIF_HOST_END
) {
173 "TE ended - current time %lu, estimated end %lu\n",
174 jiffies
, te_data
->end_jiffies
);
176 if (te_data
->vif
->type
== NL80211_IFTYPE_P2P_DEVICE
) {
177 ieee80211_remain_on_channel_expired(mvm
->hw
);
178 iwl_mvm_roc_finished(mvm
);
182 * By now, we should have finished association
183 * and know the dtim period.
185 if (te_data
->vif
->type
== NL80211_IFTYPE_STATION
&&
186 (!te_data
->vif
->bss_conf
.assoc
||
187 !te_data
->vif
->bss_conf
.dtim_period
)) {
189 "No assocation and the time event is over already...\n");
190 ieee80211_connection_loss(te_data
->vif
);
193 iwl_mvm_te_clear_data(mvm
, te_data
);
194 } else if (le32_to_cpu(notif
->action
) == TE_NOTIF_HOST_START
) {
195 te_data
->running
= true;
196 te_data
->end_jiffies
= jiffies
+
197 TU_TO_JIFFIES(te_data
->duration
);
199 if (te_data
->vif
->type
== NL80211_IFTYPE_P2P_DEVICE
) {
200 set_bit(IWL_MVM_STATUS_ROC_RUNNING
, &mvm
->status
);
201 ieee80211_ready_on_channel(mvm
->hw
);
204 IWL_WARN(mvm
, "Got TE with unknown action\n");
209 * The Rx handler for time event notifications
211 int iwl_mvm_rx_time_event_notif(struct iwl_mvm
*mvm
,
212 struct iwl_rx_cmd_buffer
*rxb
,
213 struct iwl_device_cmd
*cmd
)
215 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
216 struct iwl_time_event_notif
*notif
= (void *)pkt
->data
;
217 struct iwl_mvm_time_event_data
*te_data
, *tmp
;
219 IWL_DEBUG_TE(mvm
, "Time event notification - UID = 0x%x action %d\n",
220 le32_to_cpu(notif
->unique_id
),
221 le32_to_cpu(notif
->action
));
223 spin_lock_bh(&mvm
->time_event_lock
);
224 list_for_each_entry_safe(te_data
, tmp
, &mvm
->time_event_list
, list
) {
225 if (le32_to_cpu(notif
->unique_id
) == te_data
->uid
)
226 iwl_mvm_te_handle_notif(mvm
, te_data
, notif
);
228 spin_unlock_bh(&mvm
->time_event_lock
);
233 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data
*notif_wait
,
234 struct iwl_rx_packet
*pkt
, void *data
)
236 struct iwl_mvm
*mvm
=
237 container_of(notif_wait
, struct iwl_mvm
, notif_wait
);
238 struct iwl_mvm_time_event_data
*te_data
= data
;
239 struct iwl_time_event_resp
*resp
;
240 int resp_len
= le32_to_cpu(pkt
->len_n_flags
) & FH_RSCSR_FRAME_SIZE_MSK
;
242 if (WARN_ON(pkt
->hdr
.cmd
!= TIME_EVENT_CMD
))
245 if (WARN_ON_ONCE(resp_len
!= sizeof(pkt
->hdr
) + sizeof(*resp
))) {
246 IWL_ERR(mvm
, "Invalid TIME_EVENT_CMD response\n");
250 resp
= (void *)pkt
->data
;
252 /* we should never get a response to another TIME_EVENT_CMD here */
253 if (WARN_ON_ONCE(le32_to_cpu(resp
->id
) != te_data
->id
))
256 te_data
->uid
= le32_to_cpu(resp
->unique_id
);
257 IWL_DEBUG_TE(mvm
, "TIME_EVENT_CMD response - UID = 0x%x\n",
262 static int iwl_mvm_time_event_send_add(struct iwl_mvm
*mvm
,
263 struct ieee80211_vif
*vif
,
264 struct iwl_mvm_time_event_data
*te_data
,
265 struct iwl_time_event_cmd
*te_cmd
)
267 static const u8 time_event_response
[] = { TIME_EVENT_CMD
};
268 struct iwl_notification_wait wait_time_event
;
271 lockdep_assert_held(&mvm
->mutex
);
273 IWL_DEBUG_TE(mvm
, "Add new TE, duration %d TU\n",
274 le32_to_cpu(te_cmd
->duration
));
276 spin_lock_bh(&mvm
->time_event_lock
);
277 if (WARN_ON(te_data
->id
!= TE_MAX
)) {
278 spin_unlock_bh(&mvm
->time_event_lock
);
282 te_data
->duration
= le32_to_cpu(te_cmd
->duration
);
283 te_data
->id
= le32_to_cpu(te_cmd
->id
);
284 list_add_tail(&te_data
->list
, &mvm
->time_event_list
);
285 spin_unlock_bh(&mvm
->time_event_lock
);
288 * Use a notification wait, which really just processes the
289 * command response and doesn't wait for anything, in order
290 * to be able to process the response and get the UID inside
291 * the RX path. Using CMD_WANT_SKB doesn't work because it
292 * stores the buffer and then wakes up this thread, by which
293 * time another notification (that the time event started)
294 * might already be processed unsuccessfully.
296 iwl_init_notification_wait(&mvm
->notif_wait
, &wait_time_event
,
298 ARRAY_SIZE(time_event_response
),
299 iwl_mvm_time_event_response
, te_data
);
301 ret
= iwl_mvm_send_cmd_pdu(mvm
, TIME_EVENT_CMD
, CMD_SYNC
,
302 sizeof(*te_cmd
), te_cmd
);
304 IWL_ERR(mvm
, "Couldn't send TIME_EVENT_CMD: %d\n", ret
);
305 iwl_remove_notification(&mvm
->notif_wait
, &wait_time_event
);
309 /* No need to wait for anything, so just pass 1 (0 isn't valid) */
310 ret
= iwl_wait_notification(&mvm
->notif_wait
, &wait_time_event
, 1);
311 /* should never fail */
316 spin_lock_bh(&mvm
->time_event_lock
);
317 iwl_mvm_te_clear_data(mvm
, te_data
);
318 spin_unlock_bh(&mvm
->time_event_lock
);
323 void iwl_mvm_protect_session(struct iwl_mvm
*mvm
,
324 struct ieee80211_vif
*vif
,
325 u32 duration
, u32 min_duration
)
327 struct iwl_mvm_vif
*mvmvif
= iwl_mvm_vif_from_mac80211(vif
);
328 struct iwl_mvm_time_event_data
*te_data
= &mvmvif
->time_event_data
;
329 struct iwl_time_event_cmd time_cmd
= {};
331 lockdep_assert_held(&mvm
->mutex
);
333 if (te_data
->running
&&
334 time_after(te_data
->end_jiffies
,
335 jiffies
+ TU_TO_JIFFIES(min_duration
))) {
336 IWL_DEBUG_TE(mvm
, "We have enough time in the current TE: %u\n",
337 jiffies_to_msecs(te_data
->end_jiffies
- jiffies
));
341 if (te_data
->running
) {
342 IWL_DEBUG_TE(mvm
, "extend 0x%x: only %u ms left\n",
344 jiffies_to_msecs(te_data
->end_jiffies
- jiffies
));
346 * we don't have enough time
347 * cancel the current TE and issue a new one
348 * Of course it would be better to remove the old one only
349 * when the new one is added, but we don't care if we are off
350 * channel for a bit. All we need to do, is not to return
351 * before we actually begin to be on the channel.
353 iwl_mvm_stop_session_protection(mvm
, vif
);
356 time_cmd
.action
= cpu_to_le32(FW_CTXT_ACTION_ADD
);
357 time_cmd
.id_and_color
=
358 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif
->id
, mvmvif
->color
));
359 time_cmd
.id
= cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC
);
361 time_cmd
.apply_time
=
362 cpu_to_le32(iwl_read_prph(mvm
->trans
, DEVICE_SYSTEM_TIME_REG
));
364 time_cmd
.dep_policy
= TE_INDEPENDENT
;
365 time_cmd
.is_present
= cpu_to_le32(1);
366 time_cmd
.max_frags
= cpu_to_le32(TE_FRAG_NONE
);
367 time_cmd
.max_delay
= cpu_to_le32(500);
368 /* TODO: why do we need to interval = bi if it is not periodic? */
369 time_cmd
.interval
= cpu_to_le32(1);
370 time_cmd
.interval_reciprocal
= cpu_to_le32(iwl_mvm_reciprocal(1));
371 time_cmd
.duration
= cpu_to_le32(duration
);
372 time_cmd
.repeat
= cpu_to_le32(1);
373 time_cmd
.notify
= cpu_to_le32(TE_NOTIF_HOST_START
| TE_NOTIF_HOST_END
);
375 iwl_mvm_time_event_send_add(mvm
, vif
, te_data
, &time_cmd
);
379 * Explicit request to remove a time event. The removal of a time event needs to
380 * be synchronized with the flow of a time event's end notification, which also
381 * removes the time event from the op mode data structures.
383 void iwl_mvm_remove_time_event(struct iwl_mvm
*mvm
,
384 struct iwl_mvm_vif
*mvmvif
,
385 struct iwl_mvm_time_event_data
*te_data
)
387 struct iwl_time_event_cmd time_cmd
= {};
392 * It is possible that by the time we got to this point the time
393 * event was already removed.
395 spin_lock_bh(&mvm
->time_event_lock
);
397 /* Save time event uid before clearing its data */
402 * The clear_data function handles time events that were already removed
404 iwl_mvm_te_clear_data(mvm
, te_data
);
405 spin_unlock_bh(&mvm
->time_event_lock
);
408 * It is possible that by the time we try to remove it, the time event
409 * has already ended and removed. In such a case there is no need to
410 * send a removal command.
413 IWL_DEBUG_TE(mvm
, "TE 0x%x has already ended\n", uid
);
417 /* When we remove a TE, the UID is to be set in the id field */
418 time_cmd
.id
= cpu_to_le32(uid
);
419 time_cmd
.action
= cpu_to_le32(FW_CTXT_ACTION_REMOVE
);
420 time_cmd
.id_and_color
=
421 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif
->id
, mvmvif
->color
));
423 IWL_DEBUG_TE(mvm
, "Removing TE 0x%x\n", le32_to_cpu(time_cmd
.id
));
424 ret
= iwl_mvm_send_cmd_pdu(mvm
, TIME_EVENT_CMD
, CMD_SYNC
,
425 sizeof(time_cmd
), &time_cmd
);
430 void iwl_mvm_stop_session_protection(struct iwl_mvm
*mvm
,
431 struct ieee80211_vif
*vif
)
433 struct iwl_mvm_vif
*mvmvif
= iwl_mvm_vif_from_mac80211(vif
);
434 struct iwl_mvm_time_event_data
*te_data
= &mvmvif
->time_event_data
;
436 lockdep_assert_held(&mvm
->mutex
);
437 iwl_mvm_remove_time_event(mvm
, mvmvif
, te_data
);
440 int iwl_mvm_start_p2p_roc(struct iwl_mvm
*mvm
, struct ieee80211_vif
*vif
,
443 struct iwl_mvm_vif
*mvmvif
= iwl_mvm_vif_from_mac80211(vif
);
444 struct iwl_mvm_time_event_data
*te_data
= &mvmvif
->time_event_data
;
445 struct iwl_time_event_cmd time_cmd
= {};
447 lockdep_assert_held(&mvm
->mutex
);
448 if (te_data
->running
) {
449 IWL_WARN(mvm
, "P2P_DEVICE remain on channel already running\n");
454 * Flush the done work, just in case it's still pending, so that
455 * the work it does can complete and we can accept new frames.
457 flush_work(&mvm
->roc_done_wk
);
459 time_cmd
.action
= cpu_to_le32(FW_CTXT_ACTION_ADD
);
460 time_cmd
.id_and_color
=
461 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif
->id
, mvmvif
->color
));
462 time_cmd
.id
= cpu_to_le32(IWL_MVM_ROC_TE_TYPE
);
464 time_cmd
.apply_time
= cpu_to_le32(0);
465 time_cmd
.dep_policy
= cpu_to_le32(TE_INDEPENDENT
);
466 time_cmd
.is_present
= cpu_to_le32(1);
468 time_cmd
.interval
= cpu_to_le32(1);
471 * IWL_MVM_ROC_TE_TYPE can have lower priority than other events
472 * that are being scheduled by the driver/fw, and thus it might not be
473 * scheduled. To improve the chances of it being scheduled, allow it to
475 * In addition, for the same reasons, allow to delay the scheduling of
478 time_cmd
.max_frags
= cpu_to_le32(MSEC_TO_TU(duration
)/20);
479 time_cmd
.max_delay
= cpu_to_le32(MSEC_TO_TU(duration
/2));
480 time_cmd
.duration
= cpu_to_le32(MSEC_TO_TU(duration
));
481 time_cmd
.repeat
= cpu_to_le32(1);
482 time_cmd
.notify
= cpu_to_le32(TE_NOTIF_HOST_START
| TE_NOTIF_HOST_END
);
484 return iwl_mvm_time_event_send_add(mvm
, vif
, te_data
, &time_cmd
);
487 void iwl_mvm_stop_p2p_roc(struct iwl_mvm
*mvm
)
489 struct iwl_mvm_vif
*mvmvif
;
490 struct iwl_mvm_time_event_data
*te_data
;
492 lockdep_assert_held(&mvm
->mutex
);
495 * Iterate over the list of time events and find the time event that is
496 * associated with a P2P_DEVICE interface.
497 * This assumes that a P2P_DEVICE interface can have only a single time
498 * event at any given time and this time event coresponds to a ROC
502 spin_lock_bh(&mvm
->time_event_lock
);
503 list_for_each_entry(te_data
, &mvm
->time_event_list
, list
) {
504 if (te_data
->vif
->type
== NL80211_IFTYPE_P2P_DEVICE
) {
505 mvmvif
= iwl_mvm_vif_from_mac80211(te_data
->vif
);
509 spin_unlock_bh(&mvm
->time_event_lock
);
512 IWL_WARN(mvm
, "P2P_DEVICE no remain on channel event\n");
516 iwl_mvm_remove_time_event(mvm
, mvmvif
, te_data
);
518 iwl_mvm_roc_finished(mvm
);