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 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
11 * Copyright(c) 2018 Intel Corporation
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of version 2 of the GNU General Public License as
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20 * General Public License for more details.
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26 * Intel Linux Wireless <linuxwifi@intel.com>
27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
32 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
33 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
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68 #include <linux/spinlock.h>
69 #include <net/mac80211.h>
70 #include <linux/wait.h>
72 #include "iwl-trans.h" /* for IWL_MAX_TID_COUNT */
73 #include "fw-api.h" /* IWL_MVM_STATION_COUNT */
80 * DOC: DQA - Dynamic Queue Allocation -introduction
82 * Dynamic Queue Allocation (AKA "DQA") is a feature implemented in iwlwifi
83 * driver to allow dynamic allocation of queues on-demand, rather than allocate
84 * them statically ahead of time. Ideally, we would like to allocate one queue
85 * per RA/TID, thus allowing an AP - for example - to send BE traffic to STA2
86 * even if it also needs to send traffic to a sleeping STA1, without being
87 * blocked by the sleeping station.
89 * Although the queues in DQA mode are dynamically allocated, there are still
90 * some queues that are statically allocated:
91 * TXQ #0 - command queue
93 * TXQ #2 - P2P device frames
94 * TXQ #3 - P2P GO/SoftAP GCAST/BCAST frames
95 * TXQ #4 - BSS DATA frames queue
96 * TXQ #5-8 - Non-QoS and MGMT frames queue pool
97 * TXQ #9 - P2P GO/SoftAP probe responses
98 * TXQ #10-31 - DATA frames queue pool
99 * The queues are dynamically taken from either the MGMT frames queue pool or
100 * the DATA frames one. See the %iwl_mvm_dqa_txq for more information on every
103 * When a frame for a previously unseen RA/TID comes in, it needs to be deferred
104 * until a queue is allocated for it, and only then can be TXed. Therefore, it
105 * is placed into %iwl_mvm_tid_data.deferred_tx_frames, and a worker called
106 * %mvm->add_stream_wk later allocates the queues and TXes the deferred frames.
108 * For convenience, MGMT is considered as if it has TID=8, and go to the MGMT
109 * queues in the pool. If there is no longer a free MGMT queue to allocate, a
110 * queue will be allocated from the DATA pool instead. Since QoS NDPs can create
111 * a problem for aggregations, they too will use a MGMT queue.
113 * When adding a STA, a DATA queue is reserved for it so that it can TX from
114 * it. If no such free queue exists for reserving, the STA addition will fail.
116 * If the DATA queue pool gets exhausted, no new STA will be accepted, and if a
117 * new RA/TID comes in for an existing STA, one of the STA's queues will become
118 * shared and will serve more than the single TID (but always for the same RA!).
120 * When a RA/TID needs to become aggregated, no new queue is required to be
121 * allocated, only mark the queue as aggregated via the ADD_STA command. Note,
122 * however, that a shared queue cannot be aggregated, and only after the other
123 * TIDs become inactive and are removed - only then can the queue be
124 * reconfigured and become aggregated.
126 * When removing a station, its queues are returned to the pool for reuse. Here
127 * we also need to make sure that we are synced with the worker thread that TXes
128 * the deferred frames so we don't get into a situation where the queues are
129 * removed and then the worker puts deferred frames onto the released queues or
130 * tries to allocate new queues for a STA we don't need anymore.
134 * DOC: station table - introduction
136 * The station table is a list of data structure that reprensent the stations.
137 * In STA/P2P client mode, the driver will hold one station for the AP/ GO.
138 * In GO/AP mode, the driver will have as many stations as associated clients.
139 * All these stations are reflected in the fw's station table. The driver
140 * keeps the fw's station table up to date with the ADD_STA command. Stations
141 * can be removed by the REMOVE_STA command.
143 * All the data related to a station is held in the structure %iwl_mvm_sta
144 * which is embed in the mac80211's %ieee80211_sta (in the drv_priv) area.
145 * This data includes the index of the station in the fw, per tid information
146 * (sequence numbers, Block-ack state machine, etc...). The stations are
147 * created and deleted by the %sta_state callback from %ieee80211_ops.
149 * The driver holds a map: %fw_id_to_mac_id that allows to fetch a
150 * %ieee80211_sta (and the %iwl_mvm_sta embedded into it) based on a fw
151 * station index. That way, the driver is able to get the tid related data in
152 * O(1) in time sensitive paths (Tx / Tx response / BA notification). These
153 * paths are triggered by the fw, and the driver needs to get a pointer to the
154 * %ieee80211 structure. This map helps to get that pointer quickly.
158 * DOC: station table - locking
160 * As stated before, the station is created / deleted by mac80211's %sta_state
161 * callback from %ieee80211_ops which can sleep. The next paragraph explains
162 * the locking of a single stations, the next ones relates to the station
165 * The station holds the sequence number per tid. So this data needs to be
166 * accessed in the Tx path (which is softIRQ). It also holds the Block-Ack
167 * information (the state machine / and the logic that checks if the queues
168 * were drained), so it also needs to be accessible from the Tx response flow.
169 * In short, the station needs to be access from sleepable context as well as
170 * from tasklets, so the station itself needs a spinlock.
172 * The writers of %fw_id_to_mac_id map are serialized by the global mutex of
173 * the mvm op_mode. This is possible since %sta_state can sleep.
174 * The pointers in this map are RCU protected, hence we won't replace the
175 * station while we have Tx / Tx response / BA notification running.
177 * If a station is deleted while it still has packets in its A-MPDU queues,
178 * then the reclaim flow will notice that there is no station in the map for
179 * sta_id and it will dump the responses.
183 * DOC: station table - internal stations
185 * The FW needs a few internal stations that are not reflected in
186 * mac80211, such as broadcast station in AP / GO mode, or AUX sta for
187 * scanning and P2P device (during the GO negotiation).
188 * For these kind of stations we have %iwl_mvm_int_sta struct which holds the
189 * data relevant for them from both %iwl_mvm_sta and %ieee80211_sta.
190 * Usually the data for these stations is static, so no locking is required,
191 * and no TID data as this is also not needed.
192 * One thing to note, is that these stations have an ID in the fw, but not
193 * in mac80211. In order to "reserve" them a sta_id in %fw_id_to_mac_id
194 * we fill ERR_PTR(EINVAL) in this mapping and all other dereferencing of
195 * pointers from this mapping need to check that the value is not error
198 * Currently there is only one auxiliary station for scanning, initialized
203 * DOC: station table - AP Station in STA mode
205 * %iwl_mvm_vif includes the index of the AP station in the fw's STA table:
206 * %ap_sta_id. To get the point to the corresponding %ieee80211_sta,
207 * &fw_id_to_mac_id can be used. Due to the way the fw works, we must not remove
208 * the AP station from the fw before setting the MAC context as unassociated.
209 * Hence, %fw_id_to_mac_id[%ap_sta_id] will be NULLed when the AP station is
210 * removed by mac80211, but the station won't be removed in the fw until the
211 * VIF is set as unassociated. Then, %ap_sta_id will be invalidated.
215 * DOC: station table - Drain vs. Flush
217 * Flush means that all the frames in the SCD queue are dumped regardless the
218 * station to which they were sent. We do that when we disassociate and before
219 * we remove the STA of the AP. The flush can be done synchronously against the
221 * Drain means that the fw will drop all the frames sent to a specific station.
222 * This is useful when a client (if we are IBSS / GO or AP) disassociates.
226 * DOC: station table - fw restart
228 * When the fw asserts, or we have any other issue that requires to reset the
229 * driver, we require mac80211 to reconfigure the driver. Since the private
230 * data of the stations is embed in mac80211's %ieee80211_sta, that data will
231 * not be zeroed and needs to be reinitialized manually.
232 * %IWL_MVM_STATUS_IN_HW_RESTART is set during restart and that will hint us
233 * that we must not allocate a new sta_id but reuse the previous one. This
234 * means that the stations being re-added after the reset will have the same
235 * place in the fw as before the reset. We do need to zero the %fw_id_to_mac_id
236 * map, since the stations aren't in the fw any more. Internal stations that
237 * are not added by mac80211 will be re-added in the init flow that is called
238 * after the restart: mac80211 call's %iwl_mvm_mac_start which calls to
245 * When a station is asleep, the fw will set it as "asleep". All frames on
246 * shared queues (i.e. non-aggregation queues) to that station will be dropped
247 * by the fw (%TX_STATUS_FAIL_DEST_PS failure code).
249 * AMPDUs are in a separate queue that is stopped by the fw. We just need to
250 * let mac80211 know when there are frames in these queues so that it can
251 * properly handle trigger frames.
253 * When a trigger frame is received, mac80211 tells the driver to send frames
254 * from the AMPDU queues or sends frames to non-aggregation queues itself,
255 * depending on which ACs are delivery-enabled and what TID has frames to
256 * transmit. Note that mac80211 has all the knowledge since all the non-agg
257 * frames are buffered / filtered, and the driver tells mac80211 about agg
258 * frames). The driver needs to tell the fw to let frames out even if the
259 * station is asleep. This is done by %iwl_mvm_sta_modify_sleep_tx_count.
261 * When we receive a frame from that station with PM bit unset, the driver
262 * needs to let the fw know that this station isn't asleep any more. This is
263 * done by %iwl_mvm_sta_modify_ps_wake in response to mac80211 signaling the
266 * For a GO, the Service Period might be cut short due to an absence period
267 * of the GO. In this (and all other cases) the firmware notifies us with the
268 * EOSP_NOTIFICATION, and we notify mac80211 of that. Further frames that we
269 * already sent to the device will be rejected again.
271 * See also "AP support for powersaving clients" in mac80211.h.
275 * enum iwl_mvm_agg_state
277 * The state machine of the BA agreement establishment / tear down.
278 * These states relate to a specific RA / TID.
280 * @IWL_AGG_OFF: aggregation is not used
281 * @IWL_AGG_QUEUED: aggregation start work has been queued
282 * @IWL_AGG_STARTING: aggregation are starting (between start and oper)
283 * @IWL_AGG_ON: aggregation session is up
284 * @IWL_EMPTYING_HW_QUEUE_ADDBA: establishing a BA session - waiting for the
285 * HW queue to be empty from packets for this RA /TID.
286 * @IWL_EMPTYING_HW_QUEUE_DELBA: tearing down a BA session - waiting for the
287 * HW queue to be empty from packets for this RA /TID.
289 enum iwl_mvm_agg_state {
294 IWL_EMPTYING_HW_QUEUE_ADDBA,
295 IWL_EMPTYING_HW_QUEUE_DELBA,
299 * struct iwl_mvm_tid_data - holds the states for each RA / TID
300 * @deferred_tx_frames: deferred TX frames for this RA/TID
301 * @seq_number: the next WiFi sequence number to use
302 * @next_reclaimed: the WiFi sequence number of the next packet to be acked.
303 * This is basically (last acked packet++).
304 * @rate_n_flags: Rate at which Tx was attempted. Holds the data between the
305 * Tx response (TX_CMD), and the block ack notification (COMPRESSED_BA).
306 * @lq_color: the color of the LQ command as it appears in tx response.
307 * @amsdu_in_ampdu_allowed: true if A-MSDU in A-MPDU is allowed.
308 * @state: state of the BA agreement establishment / tear down.
309 * @txq_id: Tx queue used by the BA session / DQA
310 * @ssn: the first packet to be sent in AGG HW queue in Tx AGG start flow, or
311 * the first packet to be sent in legacy HW queue in Tx AGG stop flow.
312 * Basically when next_reclaimed reaches ssn, we can tell mac80211 that
313 * we are ready to finish the Tx AGG stop / start flow.
314 * @tx_time: medium time consumed by this A-MPDU
315 * @tpt_meas_start: time of the throughput measurements start, is reset every HZ
316 * @tx_count_last: number of frames transmitted during the last second
317 * @tx_count: counts the number of frames transmitted since the last reset of
320 struct iwl_mvm_tid_data {
321 struct sk_buff_head deferred_tx_frames;
324 /* The rest is Tx AGG related */
327 bool amsdu_in_ampdu_allowed;
328 enum iwl_mvm_agg_state state;
332 unsigned long tpt_meas_start;
337 struct iwl_mvm_key_pn {
338 struct rcu_head rcu_head;
340 u8 pn[IWL_MAX_TID_COUNT][IEEE80211_CCMP_PN_LEN];
341 } ____cacheline_aligned_in_smp q[];
344 struct iwl_mvm_delba_data {
348 struct iwl_mvm_delba_notif {
349 struct iwl_mvm_internal_rxq_notif metadata;
350 struct iwl_mvm_delba_data delba;
354 * struct iwl_mvm_rxq_dup_data - per station per rx queue data
355 * @last_seq: last sequence per tid for duplicate packet detection
356 * @last_sub_frame: last subframe packet
358 struct iwl_mvm_rxq_dup_data {
359 __le16 last_seq[IWL_MAX_TID_COUNT + 1];
360 u8 last_sub_frame[IWL_MAX_TID_COUNT + 1];
361 } ____cacheline_aligned_in_smp;
364 * struct iwl_mvm_sta - representation of a station in the driver
365 * @sta_id: the index of the station in the fw (will be replaced by id_n_color)
366 * @tfd_queue_msk: the tfd queues used by the station
367 * @mac_id_n_color: the MAC context this station is linked to
368 * @tid_disable_agg: bitmap: if bit(tid) is set, the fw won't send ampdus for
370 * @max_agg_bufsize: the maximal size of the AGG buffer for this station
371 * @sta_type: station type
372 * @sta_state: station state according to enum %ieee80211_sta_state
373 * @bt_reduced_txpower: is reduced tx power enabled for this station
374 * @next_status_eosp: the next reclaimed packet is a PS-Poll response and
375 * we need to signal the EOSP
376 * @lock: lock to protect the whole struct. Since %tid_data is access from Tx
377 * and from Tx response flow, it needs a spinlock.
378 * @tid_data: per tid data + mgmt. Look at %iwl_mvm_tid_data.
379 * @tid_to_baid: a simple map of TID to baid
380 * @lq_sta: holds rate scaling data, either for the case when RS is done in
381 * the driver - %rs_drv or in the FW - %rs_fw.
382 * @reserved_queue: the queue reserved for this STA for DQA purposes
383 * Every STA has is given one reserved queue to allow it to operate. If no
384 * such queue can be guaranteed, the STA addition will fail.
385 * @tx_protection: reference counter for controlling the Tx protection.
386 * @tt_tx_protection: is thermal throttling enable Tx protection?
387 * @disable_tx: is tx to this STA disabled?
388 * @amsdu_enabled: bitmap of TX AMSDU allowed TIDs.
389 * In case TLC offload is not active it is either 0xFFFF or 0.
390 * @max_amsdu_len: max AMSDU length
391 * @agg_tids: bitmap of tids whose status is operational aggregated (IWL_AGG_ON)
392 * @sleep_tx_count: the number of frames that we told the firmware to let out
393 * even when that station is asleep. This is useful in case the queue
394 * gets empty before all the frames were sent, which can happen when
395 * we are sending frames from an AMPDU queue and there was a hole in
396 * the BA window. To be used for UAPSD only.
397 * @ptk_pn: per-queue PTK PN data structures
398 * @dup_data: per queue duplicate packet detection data
399 * @deferred_traffic_tid_map: indication bitmap of deferred traffic per-TID
401 * When mac80211 creates a station it reserves some space (hw->sta_data_size)
402 * in the structure for use by driver. This structure is placed in that
412 enum iwl_sta_type sta_type;
413 enum ieee80211_sta_state sta_state;
414 bool bt_reduced_txpower;
415 bool next_status_eosp;
417 struct iwl_mvm_tid_data tid_data[IWL_MAX_TID_COUNT + 1];
418 u8 tid_to_baid[IWL_MAX_TID_COUNT];
420 struct iwl_lq_sta_rs_fw rs_fw;
421 struct iwl_lq_sta rs_drv;
423 struct ieee80211_vif *vif;
424 struct iwl_mvm_key_pn __rcu *ptk_pn[4];
425 struct iwl_mvm_rxq_dup_data *dup_data;
427 u16 deferred_traffic_tid_map;
431 /* Temporary, until the new TLC will control the Tx protection */
433 bool tt_tx_protection;
444 u16 iwl_mvm_tid_queued(struct iwl_mvm *mvm, struct iwl_mvm_tid_data *tid_data);
446 static inline struct iwl_mvm_sta *
447 iwl_mvm_sta_from_mac80211(struct ieee80211_sta *sta)
449 return (void *)sta->drv_priv;
453 * struct iwl_mvm_int_sta - representation of an internal station (auxiliary or
455 * @sta_id: the index of the station in the fw (will be replaced by id_n_color)
456 * @type: station type
457 * @tfd_queue_msk: the tfd queues used by the station
459 struct iwl_mvm_int_sta {
461 enum iwl_sta_type type;
466 * Send the STA info to the FW.
468 * @mvm: the iwl_mvm* to use
470 * @update: this is true if the FW is being updated about a STA it already knows
471 * about. Otherwise (if this is a new STA), this should be false.
472 * @flags: if update==true, this marks what is being changed via ORs of values
473 * from enum iwl_sta_modify_flag. Otherwise, this is ignored.
475 int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
476 bool update, unsigned int flags);
477 int iwl_mvm_add_sta(struct iwl_mvm *mvm,
478 struct ieee80211_vif *vif,
479 struct ieee80211_sta *sta);
481 static inline int iwl_mvm_update_sta(struct iwl_mvm *mvm,
482 struct ieee80211_vif *vif,
483 struct ieee80211_sta *sta)
485 return iwl_mvm_sta_send_to_fw(mvm, sta, true, 0);
488 int iwl_mvm_wait_sta_queues_empty(struct iwl_mvm *mvm,
489 struct iwl_mvm_sta *mvm_sta);
490 int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
491 struct ieee80211_vif *vif,
492 struct ieee80211_sta *sta);
493 int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
494 struct ieee80211_vif *vif,
496 int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
497 struct ieee80211_vif *vif,
498 struct ieee80211_sta *sta,
499 struct ieee80211_key_conf *keyconf,
501 int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
502 struct ieee80211_vif *vif,
503 struct ieee80211_sta *sta,
504 struct ieee80211_key_conf *keyconf);
506 void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
507 struct ieee80211_vif *vif,
508 struct ieee80211_key_conf *keyconf,
509 struct ieee80211_sta *sta, u32 iv32,
512 void iwl_mvm_rx_eosp_notif(struct iwl_mvm *mvm,
513 struct iwl_rx_cmd_buffer *rxb);
516 int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
517 int tid, u16 ssn, bool start, u16 buf_size, u16 timeout);
518 int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
519 struct ieee80211_sta *sta, u16 tid, u16 *ssn);
520 int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
521 struct ieee80211_sta *sta, u16 tid, u16 buf_size,
523 int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
524 struct ieee80211_sta *sta, u16 tid);
525 int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
526 struct ieee80211_sta *sta, u16 tid);
528 int iwl_mvm_sta_tx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
529 int tid, u8 queue, bool start);
531 int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm);
532 void iwl_mvm_del_aux_sta(struct iwl_mvm *mvm);
534 int iwl_mvm_alloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
535 int iwl_mvm_send_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
536 int iwl_mvm_add_p2p_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
537 int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
538 int iwl_mvm_rm_p2p_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
539 int iwl_mvm_add_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
540 int iwl_mvm_rm_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
541 int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm,
542 struct iwl_mvm_int_sta *sta,
543 u32 qmask, enum nl80211_iftype iftype,
544 enum iwl_sta_type type);
545 void iwl_mvm_dealloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
546 void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *sta);
547 int iwl_mvm_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
548 int iwl_mvm_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
549 void iwl_mvm_dealloc_snif_sta(struct iwl_mvm *mvm);
551 void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
552 struct ieee80211_sta *sta);
553 void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
554 struct ieee80211_sta *sta,
555 enum ieee80211_frame_release_type reason,
556 u16 cnt, u16 tids, bool more_data,
557 bool single_sta_queue);
558 int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
560 void iwl_mvm_sta_modify_disable_tx(struct iwl_mvm *mvm,
561 struct iwl_mvm_sta *mvmsta, bool disable);
562 void iwl_mvm_sta_modify_disable_tx_ap(struct iwl_mvm *mvm,
563 struct ieee80211_sta *sta,
565 void iwl_mvm_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
566 struct iwl_mvm_vif *mvmvif,
568 void iwl_mvm_csa_client_absent(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
569 void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk);
571 #endif /* __sta_h__ */