drivers/net/wireless/intel/iwlwifi/mvm/sta.h

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  67
  68 #ifndef __sta_h__
  69 #define __sta_h__
  70
  71 #include <linux/spinlock.h>
  72 #include <net/mac80211.h>
  73 #include <linux/wait.h>
  74
  75 #include "iwl-trans.h" /* for IWL_MAX_TID_COUNT */
  76 #include "fw-api.h" /* IWL_MVM_STATION_COUNT */
  77 #include "rs.h"
  78
  79 struct iwl_mvm;
  80 struct iwl_mvm_vif;
  81
  82 /**
  83  * DOC: station table - introduction
  84  *
  85  * The station table is a list of data structure that reprensent the stations.
  86  * In STA/P2P client mode, the driver will hold one station for the AP/ GO.
  87  * In GO/AP mode, the driver will have as many stations as associated clients.
  88  * All these stations are reflected in the fw's station table. The driver
  89  * keeps the fw's station table up to date with the ADD_STA command. Stations
  90  * can be removed by the REMOVE_STA command.
  91  *
  92  * All the data related to a station is held in the structure %iwl_mvm_sta
  93  * which is embed in the mac80211's %ieee80211_sta (in the drv_priv) area.
  94  * This data includes the index of the station in the fw, per tid information
  95  * (sequence numbers, Block-ack state machine, etc...). The stations are
  96  * created and deleted by the %sta_state callback from %ieee80211_ops.
  97  *
  98  * The driver holds a map: %fw_id_to_mac_id that allows to fetch a
  99  * %ieee80211_sta (and the %iwl_mvm_sta embedded into it) based on a fw
 100  * station index. That way, the driver is able to get the tid related data in
 101  * O(1) in time sensitive paths (Tx / Tx response / BA notification). These
 102  * paths are triggered by the fw, and the driver needs to get a pointer to the
 103  * %ieee80211 structure. This map helps to get that pointer quickly.
 104  */
 105
 106 /**
 107  * DOC: station table - locking
 108  *
 109  * As stated before, the station is created / deleted by mac80211's %sta_state
 110  * callback from %ieee80211_ops which can sleep. The next paragraph explains
 111  * the locking of a single stations, the next ones relates to the station
 112  * table.
 113  *
 114  * The station holds the sequence number per tid. So this data needs to be
 115  * accessed in the Tx path (which is softIRQ). It also holds the Block-Ack
 116  * information (the state machine / and the logic that checks if the queues
 117  * were drained), so it also needs to be accessible from the Tx response flow.
 118  * In short, the station needs to be access from sleepable context as well as
 119  * from tasklets, so the station itself needs a spinlock.
 120  *
 121  * The writers of %fw_id_to_mac_id map are serialized by the global mutex of
 122  * the mvm op_mode. This is possible since %sta_state can sleep.
 123  * The pointers in this map are RCU protected, hence we won't replace the
 124  * station while we have Tx / Tx response / BA notification running.
 125  *
 126  * If a station is deleted while it still has packets in its A-MPDU queues,
 127  * then the reclaim flow will notice that there is no station in the map for
 128  * sta_id and it will dump the responses.
 129  */
 130
 131 /**
 132  * DOC: station table - internal stations
 133  *
 134  * The FW needs a few internal stations that are not reflected in
 135  * mac80211, such as broadcast station in AP / GO mode, or AUX sta for
 136  * scanning and P2P device (during the GO negotiation).
 137  * For these kind of stations we have %iwl_mvm_int_sta struct which holds the
 138  * data relevant for them from both %iwl_mvm_sta and %ieee80211_sta.
 139  * Usually the data for these stations is static, so no locking is required,
 140  * and no TID data as this is also not needed.
 141  * One thing to note, is that these stations have an ID in the fw, but not
 142  * in mac80211. In order to "reserve" them a sta_id in %fw_id_to_mac_id
 143  * we fill ERR_PTR(EINVAL) in this mapping and all other dereferencing of
 144  * pointers from this mapping need to check that the value is not error
 145  * or NULL.
 146  *
 147  * Currently there is only one auxiliary station for scanning, initialized
 148  * on init.
 149  */
 150
 151 /**
 152  * DOC: station table - AP Station in STA mode
 153  *
 154  * %iwl_mvm_vif includes the index of the AP station in the fw's STA table:
 155  * %ap_sta_id. To get the point to the corresponding %ieee80211_sta,
 156  * &fw_id_to_mac_id can be used. Due to the way the fw works, we must not remove
 157  * the AP station from the fw before setting the MAC context as unassociated.
 158  * Hence, %fw_id_to_mac_id[%ap_sta_id] will be NULLed when the AP station is
 159  * removed by mac80211, but the station won't be removed in the fw until the
 160  * VIF is set as unassociated. Then, %ap_sta_id will be invalidated.
 161  */
 162
 163 /**
 164  * DOC: station table - Drain vs. Flush
 165  *
 166  * Flush means that all the frames in the SCD queue are dumped regardless the
 167  * station to which they were sent. We do that when we disassociate and before
 168  * we remove the STA of the AP. The flush can be done synchronously against the
 169  * fw.
 170  * Drain means that the fw will drop all the frames sent to a specific station.
 171  * This is useful when a client (if we are IBSS / GO or AP) disassociates. In
 172  * that case, we need to drain all the frames for that client from the AC queues
 173  * that are shared with the other clients. Only then, we can remove the STA in
 174  * the fw. In order to do so, we track the non-AMPDU packets for each station.
 175  * If mac80211 removes a STA and if it still has non-AMPDU packets pending in
 176  * the queues, we mark this station as %EBUSY in %fw_id_to_mac_id, and drop all
 177  * the frames for this STA (%iwl_mvm_rm_sta). When the last frame is dropped
 178  * (we know about it with its Tx response), we remove the station in fw and set
 179  * it as %NULL in %fw_id_to_mac_id: this is the purpose of
 180  * %iwl_mvm_sta_drained_wk.
 181  */
 182
 183 /**
 184  * DOC: station table - fw restart
 185  *
 186  * When the fw asserts, or we have any other issue that requires to reset the
 187  * driver, we require mac80211 to reconfigure the driver. Since the private
 188  * data of the stations is embed in mac80211's %ieee80211_sta, that data will
 189  * not be zeroed and needs to be reinitialized manually.
 190  * %IWL_MVM_STATUS_IN_HW_RESTART is set during restart and that will hint us
 191  * that we must not allocate a new sta_id but reuse the previous one. This
 192  * means that the stations being re-added after the reset will have the same
 193  * place in the fw as before the reset. We do need to zero the %fw_id_to_mac_id
 194  * map, since the stations aren't in the fw any more. Internal stations that
 195  * are not added by mac80211 will be re-added in the init flow that is called
 196  * after the restart: mac80211 call's %iwl_mvm_mac_start which calls to
 197  * %iwl_mvm_up.
 198  */
 199
 200 /**
 201  * DOC: AP mode - PS
 202  *
 203  * When a station is asleep, the fw will set it as "asleep". All frames on
 204  * shared queues (i.e. non-aggregation queues) to that station will be dropped
 205  * by the fw (%TX_STATUS_FAIL_DEST_PS failure code).
 206  *
 207  * AMPDUs are in a separate queue that is stopped by the fw. We just need to
 208  * let mac80211 know when there are frames in these queues so that it can
 209  * properly handle trigger frames.
 210  *
 211  * When a trigger frame is received, mac80211 tells the driver to send frames
 212  * from the AMPDU queues or sends frames to non-aggregation queues itself,
 213  * depending on which ACs are delivery-enabled and what TID has frames to
 214  * transmit. Note that mac80211 has all the knowledge since all the non-agg
 215  * frames are buffered / filtered, and the driver tells mac80211 about agg
 216  * frames). The driver needs to tell the fw to let frames out even if the
 217  * station is asleep. This is done by %iwl_mvm_sta_modify_sleep_tx_count.
 218  *
 219  * When we receive a frame from that station with PM bit unset, the driver
 220  * needs to let the fw know that this station isn't asleep any more. This is
 221  * done by %iwl_mvm_sta_modify_ps_wake in response to mac80211 signaling the
 222  * station's wakeup.
 223  *
 224  * For a GO, the Service Period might be cut short due to an absence period
 225  * of the GO. In this (and all other cases) the firmware notifies us with the
 226  * EOSP_NOTIFICATION, and we notify mac80211 of that. Further frames that we
 227  * already sent to the device will be rejected again.
 228  *
 229  * See also "AP support for powersaving clients" in mac80211.h.
 230  */
 231
 232 /**
 233  * enum iwl_mvm_agg_state
 234  *
 235  * The state machine of the BA agreement establishment / tear down.
 236  * These states relate to a specific RA / TID.
 237  *
 238  * @IWL_AGG_OFF: aggregation is not used
 239  * @IWL_AGG_STARTING: aggregation are starting (between start and oper)
 240  * @IWL_AGG_ON: aggregation session is up
 241  * @IWL_EMPTYING_HW_QUEUE_ADDBA: establishing a BA session - waiting for the
 242  *      HW queue to be empty from packets for this RA /TID.
 243  * @IWL_EMPTYING_HW_QUEUE_DELBA: tearing down a BA session - waiting for the
 244  *      HW queue to be empty from packets for this RA /TID.
 245  */
 246 enum iwl_mvm_agg_state {
 247         IWL_AGG_OFF = 0,
 248         IWL_AGG_STARTING,
 249         IWL_AGG_ON,
 250         IWL_EMPTYING_HW_QUEUE_ADDBA,
 251         IWL_EMPTYING_HW_QUEUE_DELBA,
 252 };
 253
 254 /**
 255  * struct iwl_mvm_tid_data - holds the states for each RA / TID
 256  * @seq_number: the next WiFi sequence number to use
 257  * @next_reclaimed: the WiFi sequence number of the next packet to be acked.
 258  *      This is basically (last acked packet++).
 259  * @rate_n_flags: Rate at which Tx was attempted. Holds the data between the
 260  *      Tx response (TX_CMD), and the block ack notification (COMPRESSED_BA).
 261  * @amsdu_in_ampdu_allowed: true if A-MSDU in A-MPDU is allowed.
 262  * @state: state of the BA agreement establishment / tear down.
 263  * @txq_id: Tx queue used by the BA session
 264  * @ssn: the first packet to be sent in AGG HW queue in Tx AGG start flow, or
 265  *      the first packet to be sent in legacy HW queue in Tx AGG stop flow.
 266  *      Basically when next_reclaimed reaches ssn, we can tell mac80211 that
 267  *      we are ready to finish the Tx AGG stop / start flow.
 268  * @tx_time: medium time consumed by this A-MPDU
 269  */
 270 struct iwl_mvm_tid_data {
 271         u16 seq_number;
 272         u16 next_reclaimed;
 273         /* The rest is Tx AGG related */
 274         u32 rate_n_flags;
 275         bool amsdu_in_ampdu_allowed;
 276         enum iwl_mvm_agg_state state;
 277         u16 txq_id;
 278         u16 ssn;
 279         u16 tx_time;
 280 };
 281
 282 static inline u16 iwl_mvm_tid_queued(struct iwl_mvm_tid_data *tid_data)
 283 {
 284         return ieee80211_sn_sub(IEEE80211_SEQ_TO_SN(tid_data->seq_number),
 285                                 tid_data->next_reclaimed);
 286 }
 287
 288 struct iwl_mvm_key_pn {
 289         struct rcu_head rcu_head;
 290         struct {
 291                 u8 pn[IWL_MAX_TID_COUNT][IEEE80211_CCMP_PN_LEN];
 292         } ____cacheline_aligned_in_smp q[];
 293 };
 294
 295 /**
 296  * struct iwl_mvm_rxq_dup_data - per station per rx queue data
 297  * @last_seq: last sequence per tid for duplicate packet detection
 298  * @last_sub_frame: last subframe packet
 299  */
 300 struct iwl_mvm_rxq_dup_data {
 301         __le16 last_seq[IWL_MAX_TID_COUNT + 1];
 302         u8 last_sub_frame[IWL_MAX_TID_COUNT + 1];
 303 } ____cacheline_aligned_in_smp;
 304
 305 /**
 306  * struct iwl_mvm_sta - representation of a station in the driver
 307  * @sta_id: the index of the station in the fw (will be replaced by id_n_color)
 308  * @tfd_queue_msk: the tfd queues used by the station
 309  * @hw_queue: per-AC mapping of the TFD queues used by station
 310  * @mac_id_n_color: the MAC context this station is linked to
 311  * @tid_disable_agg: bitmap: if bit(tid) is set, the fw won't send ampdus for
 312  *      tid.
 313  * @max_agg_bufsize: the maximal size of the AGG buffer for this station
 314  * @bt_reduced_txpower: is reduced tx power enabled for this station
 315  * @next_status_eosp: the next reclaimed packet is a PS-Poll response and
 316  *      we need to signal the EOSP
 317  * @lock: lock to protect the whole struct. Since %tid_data is access from Tx
 318  * and from Tx response flow, it needs a spinlock.
 319  * @tid_data: per tid data. Look at %iwl_mvm_tid_data.
 320  * @tx_protection: reference counter for controlling the Tx protection.
 321  * @tt_tx_protection: is thermal throttling enable Tx protection?
 322  * @disable_tx: is tx to this STA disabled?
 323  * @tlc_amsdu: true if A-MSDU is allowed
 324  * @agg_tids: bitmap of tids whose status is operational aggregated (IWL_AGG_ON)
 325  * @sleep_tx_count: the number of frames that we told the firmware to let out
 326  *      even when that station is asleep. This is useful in case the queue
 327  *      gets empty before all the frames were sent, which can happen when
 328  *      we are sending frames from an AMPDU queue and there was a hole in
 329  *      the BA window. To be used for UAPSD only.
 330  * @ptk_pn: per-queue PTK PN data structures
 331  * @dup_data: per queue duplicate packet detection data
 332  *
 333  * When mac80211 creates a station it reserves some space (hw->sta_data_size)
 334  * in the structure for use by driver. This structure is placed in that
 335  * space.
 336  *
 337  */
 338 struct iwl_mvm_sta {
 339         u32 sta_id;
 340         u32 tfd_queue_msk;
 341         u8 hw_queue[IEEE80211_NUM_ACS];
 342         u32 mac_id_n_color;
 343         u16 tid_disable_agg;
 344         u8 max_agg_bufsize;
 345         bool bt_reduced_txpower;
 346         bool next_status_eosp;
 347         spinlock_t lock;
 348         struct iwl_mvm_tid_data tid_data[IWL_MAX_TID_COUNT];
 349         struct iwl_lq_sta lq_sta;
 350         struct ieee80211_vif *vif;
 351         struct iwl_mvm_key_pn __rcu *ptk_pn[4];
 352         struct iwl_mvm_rxq_dup_data *dup_data;
 353
 354         /* Temporary, until the new TLC will control the Tx protection */
 355         s8 tx_protection;
 356         bool tt_tx_protection;
 357
 358         bool disable_tx;
 359         bool tlc_amsdu;
 360         u8 agg_tids;
 361         u8 sleep_tx_count;
 362 };
 363
 364 static inline struct iwl_mvm_sta *
 365 iwl_mvm_sta_from_mac80211(struct ieee80211_sta *sta)
 366 {
 367         return (void *)sta->drv_priv;
 368 }
 369
 370 /**
 371  * struct iwl_mvm_int_sta - representation of an internal station (auxiliary or
 372  * broadcast)
 373  * @sta_id: the index of the station in the fw (will be replaced by id_n_color)
 374  * @tfd_queue_msk: the tfd queues used by the station
 375  */
 376 struct iwl_mvm_int_sta {
 377         u32 sta_id;
 378         u32 tfd_queue_msk;
 379 };
 380
 381 int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 382                            bool update);
 383 int iwl_mvm_add_sta(struct iwl_mvm *mvm,
 384                     struct ieee80211_vif *vif,
 385                     struct ieee80211_sta *sta);
 386 int iwl_mvm_update_sta(struct iwl_mvm *mvm,
 387                        struct ieee80211_vif *vif,
 388                        struct ieee80211_sta *sta);
 389 int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
 390                    struct ieee80211_vif *vif,
 391                    struct ieee80211_sta *sta);
 392 int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
 393                       struct ieee80211_vif *vif,
 394                       u8 sta_id);
 395 int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
 396                         struct ieee80211_vif *vif,
 397                         struct ieee80211_sta *sta,
 398                         struct ieee80211_key_conf *keyconf,
 399                         u8 key_offset);
 400 int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
 401                            struct ieee80211_vif *vif,
 402                            struct ieee80211_sta *sta,
 403                            struct ieee80211_key_conf *keyconf);
 404
 405 void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
 406                              struct ieee80211_vif *vif,
 407                              struct ieee80211_key_conf *keyconf,
 408                              struct ieee80211_sta *sta, u32 iv32,
 409                              u16 *phase1key);
 410
 411 void iwl_mvm_rx_eosp_notif(struct iwl_mvm *mvm,
 412                            struct iwl_rx_cmd_buffer *rxb);
 413
 414 /* AMPDU */
 415 int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 416                        int tid, u16 ssn, bool start, u8 buf_size);
 417 int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 418                         struct ieee80211_sta *sta, u16 tid, u16 *ssn);
 419 int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 420                             struct ieee80211_sta *sta, u16 tid, u8 buf_size,
 421                             bool amsdu);
 422 int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 423                             struct ieee80211_sta *sta, u16 tid);
 424 int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 425                             struct ieee80211_sta *sta, u16 tid);
 426
 427 int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm);
 428 void iwl_mvm_del_aux_sta(struct iwl_mvm *mvm);
 429
 430 int iwl_mvm_alloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 431 int iwl_mvm_send_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 432 int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 433 int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 434 int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 435 int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm,
 436                              struct iwl_mvm_int_sta *sta,
 437                                     u32 qmask, enum nl80211_iftype iftype);
 438 void iwl_mvm_dealloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 439 int iwl_mvm_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 440 int iwl_mvm_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 441 void iwl_mvm_dealloc_snif_sta(struct iwl_mvm *mvm);
 442
 443 void iwl_mvm_sta_drained_wk(struct work_struct *wk);
 444 void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
 445                                 struct ieee80211_sta *sta);
 446 void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
 447                                        struct ieee80211_sta *sta,
 448                                        enum ieee80211_frame_release_type reason,
 449                                        u16 cnt, u16 tids, bool more_data,
 450                                        bool agg);
 451 int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 452                       bool drain);
 453 void iwl_mvm_sta_modify_disable_tx(struct iwl_mvm *mvm,
 454                                    struct iwl_mvm_sta *mvmsta, bool disable);
 455 void iwl_mvm_sta_modify_disable_tx_ap(struct iwl_mvm *mvm,
 456                                       struct ieee80211_sta *sta,
 457                                       bool disable);
 458 void iwl_mvm_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
 459                                        struct iwl_mvm_vif *mvmvif,
 460                                        bool disable);
 461 void iwl_mvm_csa_client_absent(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 462
 463 #endif /* __sta_h__ */