| /****************************************************************************** |
| * |
| * This file is provided under a dual BSD/GPLv2 license. When using or |
| * redistributing this file, you may do so under either license. |
| * |
| * GPL LICENSE SUMMARY |
| * |
| * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| * General Public License for more details. |
| * |
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| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, |
| * USA |
| * |
| * The full GNU General Public License is included in this distribution |
| * in the file called COPYING. |
| * |
| * Contact Information: |
| * Intel Linux Wireless <ilw@linux.intel.com> |
| * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| * |
| * BSD LICENSE |
| * |
| * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. |
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| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| * |
| *****************************************************************************/ |
| |
| #ifndef __sta_h__ |
| #define __sta_h__ |
| |
| #include <linux/spinlock.h> |
| #include <net/mac80211.h> |
| #include <linux/wait.h> |
| |
| #include "iwl-trans.h" /* for IWL_MAX_TID_COUNT */ |
| #include "fw-api.h" /* IWL_MVM_STATION_COUNT */ |
| #include "rs.h" |
| |
| struct iwl_mvm; |
| |
| /** |
| * DOC: station table - introduction |
| * |
| * The station table is a list of data structure that reprensent the stations. |
| * In STA/P2P client mode, the driver will hold one station for the AP/ GO. |
| * In GO/AP mode, the driver will have as many stations as associated clients. |
| * All these stations are reflected in the fw's station table. The driver |
| * keeps the fw's station table up to date with the ADD_STA command. Stations |
| * can be removed by the REMOVE_STA command. |
| * |
| * All the data related to a station is held in the structure %iwl_mvm_sta |
| * which is embed in the mac80211's %ieee80211_sta (in the drv_priv) area. |
| * This data includes the index of the station in the fw, per tid information |
| * (sequence numbers, Block-ack state machine, etc...). The stations are |
| * created and deleted by the %sta_state callback from %ieee80211_ops. |
| * |
| * The driver holds a map: %fw_id_to_mac_id that allows to fetch a |
| * %ieee80211_sta (and the %iwl_mvm_sta embedded into it) based on a fw |
| * station index. That way, the driver is able to get the tid related data in |
| * O(1) in time sensitive paths (Tx / Tx response / BA notification). These |
| * paths are triggered by the fw, and the driver needs to get a pointer to the |
| * %ieee80211 structure. This map helps to get that pointer quickly. |
| */ |
| |
| /** |
| * DOC: station table - locking |
| * |
| * As stated before, the station is created / deleted by mac80211's %sta_state |
| * callback from %ieee80211_ops which can sleep. The next paragraph explains |
| * the locking of a single stations, the next ones relates to the station |
| * table. |
| * |
| * The station holds the sequence number per tid. So this data needs to be |
| * accessed in the Tx path (which is softIRQ). It also holds the Block-Ack |
| * information (the state machine / and the logic that checks if the queues |
| * were drained), so it also needs to be accessible from the Tx response flow. |
| * In short, the station needs to be access from sleepable context as well as |
| * from tasklets, so the station itself needs a spinlock. |
| * |
| * The writers of %fw_id_to_mac_id map are serialized by the global mutex of |
| * the mvm op_mode. This is possible since %sta_state can sleep. |
| * The pointers in this map are RCU protected, hence we won't replace the |
| * station while we have Tx / Tx response / BA notification running. |
| * |
| * If a station is deleted while it still has packets in its A-MPDU queues, |
| * then the reclaim flow will notice that there is no station in the map for |
| * sta_id and it will dump the responses. |
| */ |
| |
| /** |
| * DOC: station table - internal stations |
| * |
| * The FW needs a few internal stations that are not reflected in |
| * mac80211, such as broadcast station in AP / GO mode, or AUX sta for |
| * scanning and P2P device (during the GO negotiation). |
| * For these kind of stations we have %iwl_mvm_int_sta struct which holds the |
| * data relevant for them from both %iwl_mvm_sta and %ieee80211_sta. |
| * Usually the data for these stations is static, so no locking is required, |
| * and no TID data as this is also not needed. |
| * One thing to note, is that these stations have an ID in the fw, but not |
| * in mac80211. In order to "reserve" them a sta_id in %fw_id_to_mac_id |
| * we fill ERR_PTR(EINVAL) in this mapping and all other dereferencing of |
| * pointers from this mapping need to check that the value is not error |
| * or NULL. |
| * |
| * Currently there is only one auxiliary station for scanning, initialized |
| * on init. |
| */ |
| |
| /** |
| * DOC: station table - AP Station in STA mode |
| * |
| * %iwl_mvm_vif includes the index of the AP station in the fw's STA table: |
| * %ap_sta_id. To get the point to the coresponsding %ieee80211_sta, |
| * &fw_id_to_mac_id can be used. Due to the way the fw works, we must not remove |
| * the AP station from the fw before setting the MAC context as unassociated. |
| * Hence, %fw_id_to_mac_id[%ap_sta_id] will be NULLed when the AP station is |
| * removed by mac80211, but the station won't be removed in the fw until the |
| * VIF is set as unassociated. Then, %ap_sta_id will be invalidated. |
| */ |
| |
| /** |
| * DOC: station table - Drain vs. Flush |
| * |
| * Flush means that all the frames in the SCD queue are dumped regardless the |
| * station to which they were sent. We do that when we disassociate and before |
| * we remove the STA of the AP. The flush can be done synchronously against the |
| * fw. |
| * Drain means that the fw will drop all the frames sent to a specific station. |
| * This is useful when a client (if we are IBSS / GO or AP) disassociates. In |
| * that case, we need to drain all the frames for that client from the AC queues |
| * that are shared with the other clients. Only then, we can remove the STA in |
| * the fw. In order to do so, we track the non-AMPDU packets for each station. |
| * If mac80211 removes a STA and if it still has non-AMPDU packets pending in |
| * the queues, we mark this station as %EBUSY in %fw_id_to_mac_id, and drop all |
| * the frames for this STA (%iwl_mvm_rm_sta). When the last frame is dropped |
| * (we know about it with its Tx response), we remove the station in fw and set |
| * it as %NULL in %fw_id_to_mac_id: this is the purpose of |
| * %iwl_mvm_sta_drained_wk. |
| */ |
| |
| /** |
| * DOC: station table - fw restart |
| * |
| * When the fw asserts, or we have any other issue that requires to reset the |
| * driver, we require mac80211 to reconfigure the driver. Since the private |
| * data of the stations is embed in mac80211's %ieee80211_sta, that data will |
| * not be zeroed and needs to be reinitialized manually. |
| * %IWL_MVM_STATUS_IN_HW_RESTART is set during restart and that will hint us |
| * that we must not allocate a new sta_id but reuse the previous one. This |
| * means that the stations being re-added after the reset will have the same |
| * place in the fw as before the reset. We do need to zero the %fw_id_to_mac_id |
| * map, since the stations aren't in the fw any more. Internal stations that |
| * are not added by mac80211 will be re-added in the init flow that is called |
| * after the restart: mac80211 call's %iwl_mvm_mac_start which calls to |
| * %iwl_mvm_up. |
| */ |
| |
| /** |
| * DOC: AP mode - PS |
| * |
| * When a station is asleep, the fw will set it as "asleep". All frames on |
| * shared queues (i.e. non-aggregation queues) to that station will be dropped |
| * by the fw (%TX_STATUS_FAIL_DEST_PS failure code). |
| * |
| * AMPDUs are in a separate queue that is stopped by the fw. We just need to |
| * let mac80211 know when there are frames in these queues so that it can |
| * properly handle trigger frames. |
| * |
| * When a trigger frame is received, mac80211 tells the driver to send frames |
| * from the AMPDU queues or sends frames to non-aggregation queues itself, |
| * depending on which ACs are delivery-enabled and what TID has frames to |
| * transmit. Note that mac80211 has all the knowledege since all the non-agg |
| * frames are buffered / filtered, and the driver tells mac80211 about agg |
| * frames). The driver needs to tell the fw to let frames out even if the |
| * station is asleep. This is done by %iwl_mvm_sta_modify_sleep_tx_count. |
| * |
| * When we receive a frame from that station with PM bit unset, the driver |
| * needs to let the fw know that this station isn't asleep any more. This is |
| * done by %iwl_mvm_sta_modify_ps_wake in response to mac80211 signalling the |
| * station's wakeup. |
| * |
| * For a GO, the Service Period might be cut short due to an absence period |
| * of the GO. In this (and all other cases) the firmware notifies us with the |
| * EOSP_NOTIFICATION, and we notify mac80211 of that. Further frames that we |
| * already sent to the device will be rejected again. |
| * |
| * See also "AP support for powersaving clients" in mac80211.h. |
| */ |
| |
| /** |
| * enum iwl_mvm_agg_state |
| * |
| * The state machine of the BA agreement establishment / tear down. |
| * These states relate to a specific RA / TID. |
| * |
| * @IWL_AGG_OFF: aggregation is not used |
| * @IWL_AGG_STARTING: aggregation are starting (between start and oper) |
| * @IWL_AGG_ON: aggregation session is up |
| * @IWL_EMPTYING_HW_QUEUE_ADDBA: establishing a BA session - waiting for the |
| * HW queue to be empty from packets for this RA /TID. |
| * @IWL_EMPTYING_HW_QUEUE_DELBA: tearing down a BA session - waiting for the |
| * HW queue to be empty from packets for this RA /TID. |
| */ |
| enum iwl_mvm_agg_state { |
| IWL_AGG_OFF = 0, |
| IWL_AGG_STARTING, |
| IWL_AGG_ON, |
| IWL_EMPTYING_HW_QUEUE_ADDBA, |
| IWL_EMPTYING_HW_QUEUE_DELBA, |
| }; |
| |
| /** |
| * struct iwl_mvm_tid_data - holds the states for each RA / TID |
| * @seq_number: the next WiFi sequence number to use |
| * @next_reclaimed: the WiFi sequence number of the next packet to be acked. |
| * This is basically (last acked packet++). |
| * @rate_n_flags: Rate at which Tx was attempted. Holds the data between the |
| * Tx response (TX_CMD), and the block ack notification (COMPRESSED_BA). |
| * @reduced_tpc: Reduced tx power. Holds the data between the |
| * Tx response (TX_CMD), and the block ack notification (COMPRESSED_BA). |
| * @state: state of the BA agreement establishment / tear down. |
| * @txq_id: Tx queue used by the BA session |
| * @ssn: the first packet to be sent in AGG HW queue in Tx AGG start flow, or |
| * the first packet to be sent in legacy HW queue in Tx AGG stop flow. |
| * Basically when next_reclaimed reaches ssn, we can tell mac80211 that |
| * we are ready to finish the Tx AGG stop / start flow. |
| */ |
| struct iwl_mvm_tid_data { |
| u16 seq_number; |
| u16 next_reclaimed; |
| /* The rest is Tx AGG related */ |
| u32 rate_n_flags; |
| u8 reduced_tpc; |
| enum iwl_mvm_agg_state state; |
| u16 txq_id; |
| u16 ssn; |
| }; |
| |
| static inline u16 iwl_mvm_tid_queued(struct iwl_mvm_tid_data *tid_data) |
| { |
| return ieee80211_sn_sub(IEEE80211_SEQ_TO_SN(tid_data->seq_number), |
| tid_data->next_reclaimed); |
| } |
| |
| /** |
| * struct iwl_mvm_sta - representation of a station in the driver |
| * @sta_id: the index of the station in the fw (will be replaced by id_n_color) |
| * @tfd_queue_msk: the tfd queues used by the station |
| * @mac_id_n_color: the MAC context this station is linked to |
| * @tid_disable_agg: bitmap: if bit(tid) is set, the fw won't send ampdus for |
| * tid. |
| * @max_agg_bufsize: the maximal size of the AGG buffer for this station |
| * @bt_reduced_txpower: is reduced tx power enabled for this station |
| * @next_status_eosp: the next reclaimed packet is a PS-Poll response and |
| * we need to signal the EOSP |
| * @lock: lock to protect the whole struct. Since %tid_data is access from Tx |
| * and from Tx response flow, it needs a spinlock. |
| * @tid_data: per tid data. Look at %iwl_mvm_tid_data. |
| * @tx_protection: reference counter for controlling the Tx protection. |
| * @tt_tx_protection: is thermal throttling enable Tx protection? |
| * |
| * When mac80211 creates a station it reserves some space (hw->sta_data_size) |
| * in the structure for use by driver. This structure is placed in that |
| * space. |
| * |
| */ |
| struct iwl_mvm_sta { |
| u32 sta_id; |
| u32 tfd_queue_msk; |
| u32 mac_id_n_color; |
| u16 tid_disable_agg; |
| u8 max_agg_bufsize; |
| bool bt_reduced_txpower; |
| bool next_status_eosp; |
| spinlock_t lock; |
| struct iwl_mvm_tid_data tid_data[IWL_MAX_TID_COUNT]; |
| struct iwl_lq_sta lq_sta; |
| struct ieee80211_vif *vif; |
| |
| /* Temporary, until the new TLC will control the Tx protection */ |
| s8 tx_protection; |
| bool tt_tx_protection; |
| }; |
| |
| static inline struct iwl_mvm_sta * |
| iwl_mvm_sta_from_mac80211(struct ieee80211_sta *sta) |
| { |
| return (void *)sta->drv_priv; |
| } |
| |
| /** |
| * struct iwl_mvm_int_sta - representation of an internal station (auxiliary or |
| * broadcast) |
| * @sta_id: the index of the station in the fw (will be replaced by id_n_color) |
| * @tfd_queue_msk: the tfd queues used by the station |
| */ |
| struct iwl_mvm_int_sta { |
| u32 sta_id; |
| u32 tfd_queue_msk; |
| }; |
| |
| int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta, |
| bool update); |
| int iwl_mvm_add_sta(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta); |
| int iwl_mvm_update_sta(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta); |
| int iwl_mvm_rm_sta(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta); |
| int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| u8 sta_id); |
| int iwl_mvm_set_sta_key(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, |
| struct ieee80211_key_conf *key, |
| bool have_key_offset); |
| int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, |
| struct ieee80211_key_conf *keyconf); |
| |
| void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm, |
| struct ieee80211_vif *vif, |
| struct ieee80211_key_conf *keyconf, |
| struct ieee80211_sta *sta, u32 iv32, |
| u16 *phase1key); |
| |
| int iwl_mvm_rx_eosp_notif(struct iwl_mvm *mvm, |
| struct iwl_rx_cmd_buffer *rxb, |
| struct iwl_device_cmd *cmd); |
| |
| /* AMPDU */ |
| int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta, |
| int tid, u16 ssn, bool start); |
| int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, u16 tid, u16 *ssn); |
| int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, u16 tid, u8 buf_size); |
| int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, u16 tid); |
| int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, u16 tid); |
| |
| int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm); |
| int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *sta, |
| u32 qmask, enum nl80211_iftype iftype); |
| void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm, |
| struct iwl_mvm_int_sta *sta); |
| int iwl_mvm_send_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
| struct iwl_mvm_int_sta *bsta); |
| int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm, |
| struct iwl_mvm_int_sta *bsta); |
| int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
| struct iwl_mvm_int_sta *bsta); |
| int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *bsta); |
| void iwl_mvm_sta_drained_wk(struct work_struct *wk); |
| void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm, |
| struct ieee80211_sta *sta); |
| void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm, |
| struct ieee80211_sta *sta, |
| enum ieee80211_frame_release_type reason, |
| u16 cnt, u16 tids, bool more_data, |
| bool agg); |
| int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, |
| bool drain); |
| |
| #endif /* __sta_h__ */ |
