2 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
3 * Copyright 2012-2013, cozybit Inc.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
14 /* mesh PS management */
17 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
19 static struct sk_buff
*mps_qos_null_get(struct sta_info
*sta
)
21 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
22 struct ieee80211_local
*local
= sdata
->local
;
23 struct ieee80211_hdr
*nullfunc
; /* use 4addr header */
25 int size
= sizeof(*nullfunc
);
28 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
+ 2);
31 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
33 nullfunc
= (struct ieee80211_hdr
*) skb_put(skb
, size
);
34 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_QOS_NULLFUNC
);
35 ieee80211_fill_mesh_addresses(nullfunc
, &fc
, sta
->sta
.addr
,
37 nullfunc
->frame_control
= fc
;
38 nullfunc
->duration_id
= 0;
39 /* no address resolution for this frame -> set addr 1 immediately */
40 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
41 memset(skb_put(skb
, 2), 0, 2); /* append QoS control field */
42 ieee80211_mps_set_frame_flags(sdata
, sta
, nullfunc
);
48 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
50 static void mps_qos_null_tx(struct sta_info
*sta
)
54 skb
= mps_qos_null_get(sta
);
58 mps_dbg(sta
->sdata
, "announcing peer-specific power mode to %pM\n",
61 /* don't unintentionally start a MPSP */
62 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
63 u8
*qc
= ieee80211_get_qos_ctl((void *) skb
->data
);
65 qc
[0] |= IEEE80211_QOS_CTL_EOSP
;
68 ieee80211_tx_skb(sta
->sdata
, skb
);
72 * ieee80211_mps_local_status_update - track status of local link-specific PMs
74 * @sdata: local mesh subif
76 * sets the non-peer power mode and triggers the driver PS (re-)configuration
77 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
79 u32
ieee80211_mps_local_status_update(struct ieee80211_sub_if_data
*sdata
)
81 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
84 int light_sleep_cnt
= 0;
85 int deep_sleep_cnt
= 0;
87 enum nl80211_mesh_power_mode nonpeer_pm
;
90 list_for_each_entry_rcu(sta
, &sdata
->local
->sta_list
, list
) {
91 if (sdata
!= sta
->sdata
)
94 switch (sta
->plink_state
) {
95 case NL80211_PLINK_OPN_SNT
:
96 case NL80211_PLINK_OPN_RCVD
:
97 case NL80211_PLINK_CNF_RCVD
:
100 case NL80211_PLINK_ESTAB
:
101 if (sta
->local_pm
== NL80211_MESH_POWER_LIGHT_SLEEP
)
103 else if (sta
->local_pm
== NL80211_MESH_POWER_DEEP_SLEEP
)
113 * Set non-peer mode to active during peering/scanning/authentication
114 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
115 * deep sleep if the local STA is in light or deep sleep towards at
116 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
117 * user-configured default value.
120 mps_dbg(sdata
, "setting non-peer PM to active for peering\n");
121 nonpeer_pm
= NL80211_MESH_POWER_ACTIVE
;
122 } else if (light_sleep_cnt
|| deep_sleep_cnt
) {
123 mps_dbg(sdata
, "setting non-peer PM to deep sleep\n");
124 nonpeer_pm
= NL80211_MESH_POWER_DEEP_SLEEP
;
126 mps_dbg(sdata
, "setting non-peer PM to user value\n");
127 nonpeer_pm
= ifmsh
->mshcfg
.power_mode
;
130 /* need update if sleep counts move between 0 and non-zero */
131 if (ifmsh
->nonpeer_pm
!= nonpeer_pm
||
132 !ifmsh
->ps_peers_light_sleep
!= !light_sleep_cnt
||
133 !ifmsh
->ps_peers_deep_sleep
!= !deep_sleep_cnt
)
134 changed
= BSS_CHANGED_BEACON
;
136 ifmsh
->nonpeer_pm
= nonpeer_pm
;
137 ifmsh
->ps_peers_light_sleep
= light_sleep_cnt
;
138 ifmsh
->ps_peers_deep_sleep
= deep_sleep_cnt
;
144 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
147 * @pm: the power mode to set
148 * Return BSS_CHANGED_BEACON if a beacon update is in order.
150 u32
ieee80211_mps_set_sta_local_pm(struct sta_info
*sta
,
151 enum nl80211_mesh_power_mode pm
)
153 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
155 mps_dbg(sdata
, "local STA operates in mode %d with %pM\n",
161 * announce peer-specific power mode transition
162 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
164 if (sta
->plink_state
== NL80211_PLINK_ESTAB
)
165 mps_qos_null_tx(sta
);
167 return ieee80211_mps_local_status_update(sdata
);
171 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
173 * @sdata: local mesh subif
175 * @hdr: 802.11 frame header
177 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
179 * NOTE: sta must be given when an individually-addressed QoS frame header
180 * is handled, for group-addressed and management frames it is not used
182 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data
*sdata
,
183 struct sta_info
*sta
,
184 struct ieee80211_hdr
*hdr
)
186 enum nl80211_mesh_power_mode pm
;
189 if (WARN_ON(is_unicast_ether_addr(hdr
->addr1
) &&
190 ieee80211_is_data_qos(hdr
->frame_control
) &&
194 if (is_unicast_ether_addr(hdr
->addr1
) &&
195 ieee80211_is_data_qos(hdr
->frame_control
) &&
196 sta
->plink_state
== NL80211_PLINK_ESTAB
)
199 pm
= sdata
->u
.mesh
.nonpeer_pm
;
201 if (pm
== NL80211_MESH_POWER_ACTIVE
)
202 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_PM
);
204 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_PM
);
206 if (!ieee80211_is_data_qos(hdr
->frame_control
))
209 qc
= ieee80211_get_qos_ctl(hdr
);
211 if ((is_unicast_ether_addr(hdr
->addr1
) &&
212 pm
== NL80211_MESH_POWER_DEEP_SLEEP
) ||
213 (is_multicast_ether_addr(hdr
->addr1
) &&
214 sdata
->u
.mesh
.ps_peers_deep_sleep
> 0))
215 qc
[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL
>> 8);
217 qc
[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL
>> 8);
221 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
225 * called after change of peering status or non-peer/peer-specific power mode
227 void ieee80211_mps_sta_status_update(struct sta_info
*sta
)
229 enum nl80211_mesh_power_mode pm
;
232 /* For non-assoc STA, prevent buffering or frame transmission */
233 if (sta
->sta_state
< IEEE80211_STA_ASSOC
)
237 * use peer-specific power mode if peering is established and the
238 * peer's power mode is known
240 if (sta
->plink_state
== NL80211_PLINK_ESTAB
&&
241 sta
->peer_pm
!= NL80211_MESH_POWER_UNKNOWN
)
244 pm
= sta
->nonpeer_pm
;
246 do_buffer
= (pm
!= NL80211_MESH_POWER_ACTIVE
);
248 /* Don't let the same PS state be set twice */
249 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) == do_buffer
)
253 set_sta_flag(sta
, WLAN_STA_PS_STA
);
254 atomic_inc(&sta
->sdata
->u
.mesh
.ps
.num_sta_ps
);
255 mps_dbg(sta
->sdata
, "start PS buffering frames towards %pM\n",
258 ieee80211_sta_ps_deliver_wakeup(sta
);
261 /* clear the MPSP flags for non-peers or active STA */
262 if (sta
->plink_state
!= NL80211_PLINK_ESTAB
) {
263 clear_sta_flag(sta
, WLAN_STA_MPSP_OWNER
);
264 clear_sta_flag(sta
, WLAN_STA_MPSP_RECIPIENT
);
265 } else if (!do_buffer
) {
266 clear_sta_flag(sta
, WLAN_STA_MPSP_OWNER
);
270 static void mps_set_sta_peer_pm(struct sta_info
*sta
,
271 struct ieee80211_hdr
*hdr
)
273 enum nl80211_mesh_power_mode pm
;
274 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
277 * Test Power Management field of frame control (PW) and
278 * mesh power save level subfield of QoS control field (PSL)
280 * | PM | PSL| Mesh PM |
281 * +----+----+---------+
282 * | 0 |Rsrv| Active |
286 if (ieee80211_has_pm(hdr
->frame_control
)) {
287 if (qc
[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL
>> 8))
288 pm
= NL80211_MESH_POWER_DEEP_SLEEP
;
290 pm
= NL80211_MESH_POWER_LIGHT_SLEEP
;
292 pm
= NL80211_MESH_POWER_ACTIVE
;
295 if (sta
->peer_pm
== pm
)
298 mps_dbg(sta
->sdata
, "STA %pM enters mode %d\n",
303 ieee80211_mps_sta_status_update(sta
);
306 static void mps_set_sta_nonpeer_pm(struct sta_info
*sta
,
307 struct ieee80211_hdr
*hdr
)
309 enum nl80211_mesh_power_mode pm
;
311 if (ieee80211_has_pm(hdr
->frame_control
))
312 pm
= NL80211_MESH_POWER_DEEP_SLEEP
;
314 pm
= NL80211_MESH_POWER_ACTIVE
;
316 if (sta
->nonpeer_pm
== pm
)
319 mps_dbg(sta
->sdata
, "STA %pM sets non-peer mode to %d\n",
322 sta
->nonpeer_pm
= pm
;
324 ieee80211_mps_sta_status_update(sta
);
328 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
330 * @sta: STA info that transmitted the frame
331 * @hdr: IEEE 802.11 (QoS) Header
333 void ieee80211_mps_rx_h_sta_process(struct sta_info
*sta
,
334 struct ieee80211_hdr
*hdr
)
336 if (is_unicast_ether_addr(hdr
->addr1
) &&
337 ieee80211_is_data_qos(hdr
->frame_control
)) {
339 * individually addressed QoS Data/Null frames contain
340 * peer link-specific PS mode towards the local STA
342 mps_set_sta_peer_pm(sta
, hdr
);
344 /* check for mesh Peer Service Period trigger frames */
345 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr
),
349 * can only determine non-peer PS mode
350 * (see IEEE802.11-2012 8.2.4.1.7)
352 mps_set_sta_nonpeer_pm(sta
, hdr
);
357 /* mesh PS frame release */
359 static void mpsp_trigger_send(struct sta_info
*sta
, bool rspi
, bool eosp
)
361 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
363 struct ieee80211_hdr
*nullfunc
;
364 struct ieee80211_tx_info
*info
;
367 skb
= mps_qos_null_get(sta
);
371 nullfunc
= (struct ieee80211_hdr
*) skb
->data
;
373 nullfunc
->frame_control
|=
374 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
376 * | RSPI | EOSP | MPSP triggering |
377 * +------+------+--------------------+
378 * | 0 | 0 | local STA is owner |
379 * | 0 | 1 | no MPSP (MPSP end) |
380 * | 1 | 0 | both STA are owner |
381 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2
383 qc
= ieee80211_get_qos_ctl(nullfunc
);
385 qc
[1] |= (IEEE80211_QOS_CTL_RSPI
>> 8);
387 qc
[0] |= IEEE80211_QOS_CTL_EOSP
;
389 info
= IEEE80211_SKB_CB(skb
);
391 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
392 IEEE80211_TX_CTL_REQ_TX_STATUS
;
394 mps_dbg(sdata
, "sending MPSP trigger%s%s to %pM\n",
395 rspi
? " RSPI" : "", eosp
? " EOSP" : "", sta
->sta
.addr
);
397 ieee80211_tx_skb(sdata
, skb
);
401 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
403 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
404 * flag in the QoS Control field. In case the current tailing frame is not a
405 * QoS Data frame, append a QoS Null to carry the flag.
407 static void mpsp_qos_null_append(struct sta_info
*sta
,
408 struct sk_buff_head
*frames
)
410 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
411 struct sk_buff
*new_skb
, *skb
= skb_peek_tail(frames
);
412 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
413 struct ieee80211_tx_info
*info
;
415 if (ieee80211_is_data_qos(hdr
->frame_control
))
418 new_skb
= mps_qos_null_get(sta
);
422 mps_dbg(sdata
, "appending QoS Null in MPSP towards %pM\n",
425 * This frame has to be transmitted last. Assign lowest priority to
426 * make sure it cannot pass other frames when releasing multiple ACs.
428 new_skb
->priority
= 1;
429 skb_set_queue_mapping(new_skb
, IEEE80211_AC_BK
);
430 ieee80211_set_qos_hdr(sdata
, new_skb
);
432 info
= IEEE80211_SKB_CB(new_skb
);
433 info
->control
.vif
= &sdata
->vif
;
434 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
436 __skb_queue_tail(frames
, new_skb
);
440 * mps_frame_deliver - transmit frames during mesh powersave
442 * @sta: STA info to transmit to
443 * @n_frames: number of frames to transmit. -1 for all
445 static void mps_frame_deliver(struct sta_info
*sta
, int n_frames
)
447 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
448 struct ieee80211_local
*local
= sdata
->local
;
450 struct sk_buff_head frames
;
452 bool more_data
= false;
454 skb_queue_head_init(&frames
);
456 /* collect frame(s) from buffers */
457 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
458 while (n_frames
!= 0) {
459 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
462 &sta
->ps_tx_buf
[ac
]);
464 local
->total_ps_buffered
--;
469 __skb_queue_tail(&frames
, skb
);
472 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
473 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]))
477 /* nothing to send? -> EOSP */
478 if (skb_queue_empty(&frames
)) {
479 mpsp_trigger_send(sta
, false, true);
483 /* in a MPSP make sure the last skb is a QoS Data frame */
484 if (test_sta_flag(sta
, WLAN_STA_MPSP_OWNER
))
485 mpsp_qos_null_append(sta
, &frames
);
487 mps_dbg(sta
->sdata
, "sending %d frames to PS STA %pM\n",
488 skb_queue_len(&frames
), sta
->sta
.addr
);
490 /* prepare collected frames for transmission */
491 skb_queue_walk(&frames
, skb
) {
492 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
493 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
496 * Tell TX path to send this frame even though the
497 * STA may still remain is PS mode after this frame
500 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
502 if (more_data
|| !skb_queue_is_last(&frames
, skb
))
503 hdr
->frame_control
|=
504 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
506 hdr
->frame_control
&=
507 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
509 if (skb_queue_is_last(&frames
, skb
) &&
510 ieee80211_is_data_qos(hdr
->frame_control
)) {
511 u8
*qoshdr
= ieee80211_get_qos_ctl(hdr
);
513 /* MPSP trigger frame ends service period */
514 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
515 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
519 ieee80211_add_pending_skbs(local
, &frames
);
520 sta_info_recalc_tim(sta
);
524 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
526 * @qc: QoS Control field
527 * @sta: peer to start a MPSP with
528 * @tx: frame was transmitted by the local STA
529 * @acked: frame has been transmitted successfully
531 * NOTE: active mode STA may only serve as MPSP owner
533 void ieee80211_mpsp_trigger_process(u8
*qc
, struct sta_info
*sta
,
536 u8 rspi
= qc
[1] & (IEEE80211_QOS_CTL_RSPI
>> 8);
537 u8 eosp
= qc
[0] & IEEE80211_QOS_CTL_EOSP
;
541 set_sta_flag(sta
, WLAN_STA_MPSP_RECIPIENT
);
544 clear_sta_flag(sta
, WLAN_STA_MPSP_OWNER
);
546 test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
547 !test_and_set_sta_flag(sta
, WLAN_STA_MPSP_OWNER
))
548 mps_frame_deliver(sta
, -1);
551 clear_sta_flag(sta
, WLAN_STA_MPSP_RECIPIENT
);
552 else if (sta
->local_pm
!= NL80211_MESH_POWER_ACTIVE
)
553 set_sta_flag(sta
, WLAN_STA_MPSP_RECIPIENT
);
555 if (rspi
&& !test_and_set_sta_flag(sta
, WLAN_STA_MPSP_OWNER
))
556 mps_frame_deliver(sta
, -1);
561 * ieee80211_mps_frame_release - release buffered frames in response to beacon
566 * For peers if we have individually-addressed frames buffered or the peer
567 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
568 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
569 * trigger frames. If the neighbour STA is not a peer, only send single frames.
571 void ieee80211_mps_frame_release(struct sta_info
*sta
,
572 struct ieee802_11_elems
*elems
)
574 int ac
, buffer_local
= 0;
575 bool has_buffered
= false;
577 /* TIM map only for LLID <= IEEE80211_MAX_AID */
578 if (sta
->plink_state
== NL80211_PLINK_ESTAB
)
579 has_buffered
= ieee80211_check_tim(elems
->tim
, elems
->tim_len
,
580 le16_to_cpu(sta
->llid
) % IEEE80211_MAX_AID
);
583 mps_dbg(sta
->sdata
, "%pM indicates buffered frames\n",
586 /* only transmit to PS STA with announced, non-zero awake window */
587 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
588 (!elems
->awake_window
|| !le16_to_cpu(*elems
->awake_window
)))
591 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
592 buffer_local
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]) +
593 skb_queue_len(&sta
->tx_filtered
[ac
]);
595 if (!has_buffered
&& !buffer_local
)
598 if (sta
->plink_state
== NL80211_PLINK_ESTAB
)
599 mpsp_trigger_send(sta
, has_buffered
, !buffer_local
);
601 mps_frame_deliver(sta
, 1);