251 lines
9.8 KiB
C
251 lines
9.8 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 - 2014 Intel Corporation. All rights reserved.
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* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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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 <linuxwifi@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 - 2014 Intel Corporation. All rights reserved.
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* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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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 __time_event_h__
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#define __time_event_h__
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#include "fw-api.h"
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#include "mvm.h"
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/**
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* DOC: Time Events - what is it?
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*
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* Time Events are a fw feature that allows the driver to control the presence
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* of the device on the channel. Since the fw supports multiple channels
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* concurrently, the fw may choose to jump to another channel at any time.
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* In order to make sure that the fw is on a specific channel at a certain time
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* and for a certain duration, the driver needs to issue a time event.
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*
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* The simplest example is for BSS association. The driver issues a time event,
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* waits for it to start, and only then tells mac80211 that we can start the
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* association. This way, we make sure that the association will be done
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* smoothly and won't be interrupted by channel switch decided within the fw.
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*/
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/**
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* DOC: The flow against the fw
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*
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* When the driver needs to make sure we are in a certain channel, at a certain
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* time and for a certain duration, it sends a Time Event. The flow against the
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* fw goes like this:
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* 1) Driver sends a TIME_EVENT_CMD to the fw
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* 2) Driver gets the response for that command. This response contains the
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* Unique ID (UID) of the event.
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* 3) The fw sends notification when the event starts.
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*
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* Of course the API provides various options that allow to cover parameters
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* of the flow.
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* What is the duration of the event?
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* What is the start time of the event?
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* Is there an end-time for the event?
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* How much can the event be delayed?
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* Can the event be split?
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* If yes what is the maximal number of chunks?
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* etc...
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*/
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/**
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* DOC: Abstraction to the driver
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*
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* In order to simplify the use of time events to the rest of the driver,
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* we abstract the use of time events. This component provides the functions
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* needed by the driver.
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*/
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#define IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS 600
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#define IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS 400
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/**
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* iwl_mvm_protect_session - start / extend the session protection.
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* @mvm: the mvm component
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* @vif: the virtual interface for which the session is issued
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* @duration: the duration of the session in TU.
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* @min_duration: will start a new session if the current session will end
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* in less than min_duration.
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* @max_delay: maximum delay before starting the time event (in TU)
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* @wait_for_notif: true if it is required that a time event notification be
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* waited for (that the time event has been scheduled before returning)
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*
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* This function can be used to start a session protection which means that the
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* fw will stay on the channel for %duration_ms milliseconds. This function
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* can block (sleep) until the session starts. This function can also be used
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* to extend a currently running session.
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* This function is meant to be used for BSS association for example, where we
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* want to make sure that the fw stays on the channel during the association.
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*/
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void iwl_mvm_protect_session(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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u32 duration, u32 min_duration,
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u32 max_delay, bool wait_for_notif);
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/**
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* iwl_mvm_stop_session_protection - cancel the session protection.
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* @mvm: the mvm component
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* @vif: the virtual interface for which the session is issued
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*
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* This functions cancels the session protection which is an act of good
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* citizenship. If it is not needed any more it should be canceled because
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* the other bindings wait for the medium during that time.
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* This funtions doesn't sleep.
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*/
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void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif);
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/*
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* iwl_mvm_rx_time_event_notif - handles %TIME_EVENT_NOTIFICATION.
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*/
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void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
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struct iwl_rx_cmd_buffer *rxb);
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/**
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* iwl_mvm_start_p2p_roc - start remain on channel for p2p device functionality
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* @mvm: the mvm component
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* @vif: the virtual interface for which the roc is requested. It is assumed
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* that the vif type is NL80211_IFTYPE_P2P_DEVICE
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* @duration: the requested duration in millisecond for the fw to be on the
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* channel that is bound to the vif.
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* @type: the remain on channel request type
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*
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* This function can be used to issue a remain on channel session,
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* which means that the fw will stay in the channel for the request %duration
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* milliseconds. The function is async, meaning that it only issues the ROC
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* request but does not wait for it to start. Once the FW is ready to serve the
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* ROC request, it will issue a notification to the driver that it is on the
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* requested channel. Once the FW completes the ROC request it will issue
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* another notification to the driver.
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*/
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int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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int duration, enum ieee80211_roc_type type);
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/**
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* iwl_mvm_stop_roc - stop remain on channel functionality
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* @mvm: the mvm component
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*
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* This function can be used to cancel an ongoing ROC session.
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* The function is async, it will instruct the FW to stop serving the ROC
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* session, but will not wait for the actual stopping of the session.
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*/
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void iwl_mvm_stop_roc(struct iwl_mvm *mvm);
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/**
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* iwl_mvm_remove_time_event - general function to clean up of time event
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* @mvm: the mvm component
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* @vif: the vif to which the time event belongs
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* @te_data: the time event data that corresponds to that time event
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*
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* This function can be used to cancel a time event regardless its type.
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* It is useful for cleaning up time events running before removing an
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* interface.
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*/
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void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
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struct iwl_mvm_vif *mvmvif,
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struct iwl_mvm_time_event_data *te_data);
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/**
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* iwl_mvm_te_clear_data - remove time event from list
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* @mvm: the mvm component
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* @te_data: the time event data to remove
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*
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* This function is mostly internal, it is made available here only
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* for firmware restart purposes.
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*/
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void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
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struct iwl_mvm_time_event_data *te_data);
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void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm);
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void iwl_mvm_roc_done_wk(struct work_struct *wk);
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/**
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* iwl_mvm_schedule_csa_period - request channel switch absence period
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* @mvm: the mvm component
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* @vif: the virtual interface for which the channel switch is issued
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* @duration: the duration of the NoA in TU.
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* @apply_time: NoA start time in GP2.
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*
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* This function is used to schedule NoA time event and is used to perform
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* the channel switch flow.
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*/
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int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
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struct ieee80211_vif *vif,
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u32 duration, u32 apply_time);
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/**
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* iwl_mvm_te_scheduled - check if the fw received the TE cmd
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* @te_data: the time event data that corresponds to that time event
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*
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* This function returns true iff this TE is added to the fw.
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*/
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static inline bool
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iwl_mvm_te_scheduled(struct iwl_mvm_time_event_data *te_data)
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{
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if (!te_data)
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return false;
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return !!te_data->uid;
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}
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#endif /* __time_event_h__ */
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