381 lines
16 KiB
C
381 lines
16 KiB
C
/******************************************************************************
|
|
*
|
|
* 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 - 2013 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
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* 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 - 2013 Intel Corporation. All rights reserved.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name Intel Corporation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#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 the
|
|
* non-aggregation frames 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 how many frames we have in these queues so that it can
|
|
* properly handle trigger frames.
|
|
* When the a trigger frame is received, mac80211 tells the driver to send
|
|
* frames from the AMPDU queues or AC queue depending on which queue 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 alseep any more.
|
|
* This is done by %iwl_mvm_sta_modify_ps_wake.
|
|
*
|
|
* TODO - EOSP handling
|
|
*/
|
|
|
|
/**
|
|
* 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).
|
|
* @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;
|
|
enum iwl_mvm_agg_state state;
|
|
u16 txq_id;
|
|
u16 ssn;
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
* @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;
|
|
spinlock_t lock;
|
|
struct iwl_mvm_tid_data tid_data[IWL_MAX_TID_COUNT];
|
|
struct iwl_lq_sta lq_sta;
|
|
struct ieee80211_vif *vif;
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
u16 last_seq_ctl;
|
|
#endif
|
|
|
|
/* Temporary, until the new TLC will control the Tx protection */
|
|
s8 tx_protection;
|
|
bool tt_tx_protection;
|
|
};
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/* 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);
|
|
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);
|
|
int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
|
|
bool drain);
|
|
|
|
#endif /* __sta_h__ */
|