379 lines
16 KiB
C
379 lines
16 KiB
C
/******************************************************************************
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called COPYING.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* BSD LICENSE
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*
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* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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#ifndef __sta_h__
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#define __sta_h__
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#include <linux/spinlock.h>
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#include <net/mac80211.h>
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#include <linux/wait.h>
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#include "iwl-trans.h" /* for IWL_MAX_TID_COUNT */
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#include "fw-api.h" /* IWL_MVM_STATION_COUNT */
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#include "rs.h"
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struct iwl_mvm;
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/**
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* DOC: station table - introduction
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*
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* The station table is a list of data structure that reprensent the stations.
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* In STA/P2P client mode, the driver will hold one station for the AP/ GO.
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* In GO/AP mode, the driver will have as many stations as associated clients.
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* All these stations are reflected in the fw's station table. The driver
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* keeps the fw's station table up to date with the ADD_STA command. Stations
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* can be removed by the REMOVE_STA command.
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*
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* All the data related to a station is held in the structure %iwl_mvm_sta
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* which is embed in the mac80211's %ieee80211_sta (in the drv_priv) area.
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* This data includes the index of the station in the fw, per tid information
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* (sequence numbers, Block-ack state machine, etc...). The stations are
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* created and deleted by the %sta_state callback from %ieee80211_ops.
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*
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* The driver holds a map: %fw_id_to_mac_id that allows to fetch a
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* %ieee80211_sta (and the %iwl_mvm_sta embedded into it) based on a fw
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* station index. That way, the driver is able to get the tid related data in
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* O(1) in time sensitive paths (Tx / Tx response / BA notification). These
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* paths are triggered by the fw, and the driver needs to get a pointer to the
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* %ieee80211 structure. This map helps to get that pointer quickly.
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*/
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/**
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* DOC: station table - locking
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*
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* As stated before, the station is created / deleted by mac80211's %sta_state
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* callback from %ieee80211_ops which can sleep. The next paragraph explains
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* the locking of a single stations, the next ones relates to the station
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* table.
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*
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* The station holds the sequence number per tid. So this data needs to be
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* accessed in the Tx path (which is softIRQ). It also holds the Block-Ack
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* information (the state machine / and the logic that checks if the queues
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* were drained), so it also needs to be accessible from the Tx response flow.
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* In short, the station needs to be access from sleepable context as well as
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* from tasklets, so the station itself needs a spinlock.
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*
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* The writers of %fw_id_to_mac_id map are serialized by the global mutex of
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* the mvm op_mode. This is possible since %sta_state can sleep.
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* The pointers in this map are RCU protected, hence we won't replace the
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* station while we have Tx / Tx response / BA notification running.
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*
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* If a station is deleted while it still has packets in its A-MPDU queues,
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* then the reclaim flow will notice that there is no station in the map for
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* sta_id and it will dump the responses.
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*/
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/**
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* DOC: station table - internal stations
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*
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* The FW needs a few internal stations that are not reflected in
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* mac80211, such as broadcast station in AP / GO mode, or AUX sta for
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* scanning and P2P device (during the GO negotiation).
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* For these kind of stations we have %iwl_mvm_int_sta struct which holds the
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* data relevant for them from both %iwl_mvm_sta and %ieee80211_sta.
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* Usually the data for these stations is static, so no locking is required,
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* and no TID data as this is also not needed.
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* One thing to note, is that these stations have an ID in the fw, but not
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* in mac80211. In order to "reserve" them a sta_id in %fw_id_to_mac_id
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* we fill ERR_PTR(EINVAL) in this mapping and all other dereferencing of
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* pointers from this mapping need to check that the value is not error
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* or NULL.
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*
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* Currently there is only one auxiliary station for scanning, initialized
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* on init.
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*/
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/**
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* DOC: station table - AP Station in STA mode
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*
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* %iwl_mvm_vif includes the index of the AP station in the fw's STA table:
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* %ap_sta_id. To get the point to the coresponsding %ieee80211_sta,
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* &fw_id_to_mac_id can be used. Due to the way the fw works, we must not remove
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* the AP station from the fw before setting the MAC context as unassociated.
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* Hence, %fw_id_to_mac_id[%ap_sta_id] will be NULLed when the AP station is
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* removed by mac80211, but the station won't be removed in the fw until the
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* VIF is set as unassociated. Then, %ap_sta_id will be invalidated.
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*/
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/**
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* DOC: station table - Drain vs. Flush
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*
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* Flush means that all the frames in the SCD queue are dumped regardless the
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* station to which they were sent. We do that when we disassociate and before
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* we remove the STA of the AP. The flush can be done synchronously against the
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* fw.
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* Drain means that the fw will drop all the frames sent to a specific station.
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* This is useful when a client (if we are IBSS / GO or AP) disassociates. In
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* that case, we need to drain all the frames for that client from the AC queues
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* that are shared with the other clients. Only then, we can remove the STA in
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* the fw. In order to do so, we track the non-AMPDU packets for each station.
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* If mac80211 removes a STA and if it still has non-AMPDU packets pending in
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* the queues, we mark this station as %EBUSY in %fw_id_to_mac_id, and drop all
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* the frames for this STA (%iwl_mvm_rm_sta). When the last frame is dropped
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* (we know about it with its Tx response), we remove the station in fw and set
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* it as %NULL in %fw_id_to_mac_id: this is the purpose of
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* %iwl_mvm_sta_drained_wk.
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*/
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/**
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* DOC: station table - fw restart
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*
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* When the fw asserts, or we have any other issue that requires to reset the
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* driver, we require mac80211 to reconfigure the driver. Since the private
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* data of the stations is embed in mac80211's %ieee80211_sta, that data will
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* not be zeroed and needs to be reinitialized manually.
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* %IWL_MVM_STATUS_IN_HW_RESTART is set during restart and that will hint us
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* that we must not allocate a new sta_id but reuse the previous one. This
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* means that the stations being re-added after the reset will have the same
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* place in the fw as before the reset. We do need to zero the %fw_id_to_mac_id
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* map, since the stations aren't in the fw any more. Internal stations that
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* are not added by mac80211 will be re-added in the init flow that is called
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* after the restart: mac80211 call's %iwl_mvm_mac_start which calls to
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* %iwl_mvm_up.
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*/
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/**
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* DOC: AP mode - PS
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*
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* When a station is asleep, the fw will set it as "asleep". All the
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* non-aggregation frames to that station will be dropped by the fw
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* (%TX_STATUS_FAIL_DEST_PS failure code).
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* AMPDUs are in a separate queue that is stopped by the fw. We just need to
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* let mac80211 know how many frames we have in these queues so that it can
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* properly handle trigger frames.
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* When the a trigger frame is received, mac80211 tells the driver to send
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* frames from the AMPDU queues or AC queue depending on which queue are
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* delivery-enabled and what TID has frames to transmit (Note that mac80211 has
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* all the knowledege since all the non-agg frames are buffered / filtered, and
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* the driver tells mac80211 about agg frames). The driver needs to tell the fw
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* to let frames out even if the station is asleep. This is done by
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* %iwl_mvm_sta_modify_sleep_tx_count.
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* When we receive a frame from that station with PM bit unset, the
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* driver needs to let the fw know that this station isn't alseep any more.
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* This is done by %iwl_mvm_sta_modify_ps_wake.
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*
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* TODO - EOSP handling
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*/
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/**
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* enum iwl_mvm_agg_state
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*
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* The state machine of the BA agreement establishment / tear down.
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* These states relate to a specific RA / TID.
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*
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* @IWL_AGG_OFF: aggregation is not used
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* @IWL_AGG_STARTING: aggregation are starting (between start and oper)
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* @IWL_AGG_ON: aggregation session is up
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* @IWL_EMPTYING_HW_QUEUE_ADDBA: establishing a BA session - waiting for the
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* HW queue to be empty from packets for this RA /TID.
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* @IWL_EMPTYING_HW_QUEUE_DELBA: tearing down a BA session - waiting for the
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* HW queue to be empty from packets for this RA /TID.
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*/
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enum iwl_mvm_agg_state {
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IWL_AGG_OFF = 0,
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IWL_AGG_STARTING,
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IWL_AGG_ON,
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IWL_EMPTYING_HW_QUEUE_ADDBA,
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IWL_EMPTYING_HW_QUEUE_DELBA,
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};
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/**
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* struct iwl_mvm_tid_data - holds the states for each RA / TID
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* @seq_number: the next WiFi sequence number to use
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* @next_reclaimed: the WiFi sequence number of the next packet to be acked.
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* This is basically (last acked packet++).
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* @rate_n_flags: Rate at which Tx was attempted. Holds the data between the
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* Tx response (TX_CMD), and the block ack notification (COMPRESSED_BA).
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* @state: state of the BA agreement establishment / tear down.
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* @txq_id: Tx queue used by the BA session
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* @ssn: the first packet to be sent in AGG HW queue in Tx AGG start flow, or
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* the first packet to be sent in legacy HW queue in Tx AGG stop flow.
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* Basically when next_reclaimed reaches ssn, we can tell mac80211 that
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* we are ready to finish the Tx AGG stop / start flow.
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* @wait_for_ba: Expect block-ack before next Tx reply
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*/
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struct iwl_mvm_tid_data {
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u16 seq_number;
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u16 next_reclaimed;
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/* The rest is Tx AGG related */
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u32 rate_n_flags;
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enum iwl_mvm_agg_state state;
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u16 txq_id;
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u16 ssn;
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bool wait_for_ba;
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};
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/**
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* struct iwl_mvm_sta - representation of a station in the driver
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* @sta_id: the index of the station in the fw (will be replaced by id_n_color)
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* @tfd_queue_msk: the tfd queues used by the station
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* @mac_id_n_color: the MAC context this station is linked to
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* @tid_disable_agg: bitmap: if bit(tid) is set, the fw won't send ampdus for
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* tid.
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* @max_agg_bufsize: the maximal size of the AGG buffer for this station
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* @bt_reduced_txpower: is reduced tx power enabled for this station
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* @lock: lock to protect the whole struct. Since %tid_data is access from Tx
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* and from Tx response flow, it needs a spinlock.
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* @pending_frames: number of frames for this STA on the shared Tx queues.
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* @tid_data: per tid data. Look at %iwl_mvm_tid_data.
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*
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* When mac80211 creates a station it reserves some space (hw->sta_data_size)
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* in the structure for use by driver. This structure is placed in that
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* space.
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*
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*/
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struct iwl_mvm_sta {
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u32 sta_id;
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u32 tfd_queue_msk;
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u32 mac_id_n_color;
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u16 tid_disable_agg;
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u8 max_agg_bufsize;
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bool bt_reduced_txpower;
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spinlock_t lock;
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atomic_t pending_frames;
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struct iwl_mvm_tid_data tid_data[IWL_MAX_TID_COUNT];
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struct iwl_lq_sta lq_sta;
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struct ieee80211_vif *vif;
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#ifdef CONFIG_PM_SLEEP
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u16 last_seq_ctl;
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#endif
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};
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/**
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* struct iwl_mvm_int_sta - representation of an internal station (auxiliary or
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* broadcast)
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* @sta_id: the index of the station in the fw (will be replaced by id_n_color)
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* @tfd_queue_msk: the tfd queues used by the station
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*/
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struct iwl_mvm_int_sta {
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u32 sta_id;
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u32 tfd_queue_msk;
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};
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int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
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bool update);
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int iwl_mvm_add_sta(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta);
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int iwl_mvm_update_sta(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta);
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int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta);
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int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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u8 sta_id);
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int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta,
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struct ieee80211_key_conf *key,
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bool have_key_offset);
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int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta,
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struct ieee80211_key_conf *keyconf);
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void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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struct ieee80211_key_conf *keyconf,
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struct ieee80211_sta *sta, u32 iv32,
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u16 *phase1key);
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/* AMPDU */
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int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
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int tid, u16 ssn, bool start);
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int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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struct ieee80211_sta *sta, u16 tid, u16 *ssn);
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int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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struct ieee80211_sta *sta, u16 tid, u8 buf_size);
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int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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struct ieee80211_sta *sta, u16 tid);
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int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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struct ieee80211_sta *sta, u16 tid);
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int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm);
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int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *sta,
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u32 qmask);
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void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm,
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struct iwl_mvm_int_sta *sta);
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int iwl_mvm_send_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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struct iwl_mvm_int_sta *bsta);
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int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm,
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struct iwl_mvm_int_sta *bsta);
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int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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struct iwl_mvm_int_sta *bsta);
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int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *bsta);
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void iwl_mvm_sta_drained_wk(struct work_struct *wk);
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void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
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struct ieee80211_sta *sta);
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void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
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struct ieee80211_sta *sta,
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enum ieee80211_frame_release_type reason,
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u16 cnt);
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int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
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bool drain);
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#endif /* __sta_h__ */
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