drivers/net/wireless/intel/iwlwifi/mvm/time-event.h

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intel/iwlwifi/mvm/time-event.h

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/iwlwifi/mvm/time-event.h
Extension
.h
Size
8389 bytes
Lines
228
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __time_event_h__
#define __time_event_h__

#include "fw-api.h"

#include "mvm.h"

/**
 * DOC: Time Events - what is it?
 *
 * Time Events are a fw feature that allows the driver to control the presence
 * of the device on the channel. Since the fw supports multiple channels
 * concurrently, the fw may choose to jump to another channel at any time.
 * In order to make sure that the fw is on a specific channel at a certain time
 * and for a certain duration, the driver needs to issue a time event.
 *
 * The simplest example is for BSS association. The driver issues a time event,
 * waits for it to start, and only then tells mac80211 that we can start the
 * association. This way, we make sure that the association will be done
 * smoothly and won't be interrupted by channel switch decided within the fw.
 */

 /**
 * DOC: The flow against the fw
 *
 * When the driver needs to make sure we are in a certain channel, at a certain
 * time and for a certain duration, it sends a Time Event. The flow against the
 * fw goes like this:
 *	1) Driver sends a TIME_EVENT_CMD to the fw
 *	2) Driver gets the response for that command. This response contains the
 *	   Unique ID (UID) of the event.
 *	3) The fw sends notification when the event starts.
 *
 * Of course the API provides various options that allow to cover parameters
 * of the flow.
 *	What is the duration of the event?
 *	What is the start time of the event?
 *	Is there an end-time for the event?
 *	How much can the event be delayed?
 *	Can the event be split?
 *	If yes what is the maximal number of chunks?
 *	etc...
 */

/**
 * DOC: Abstraction to the driver
 *
 * In order to simplify the use of time events to the rest of the driver,
 * we abstract the use of time events. This component provides the functions
 * needed by the driver.
 */

#define IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS 600
#define IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS 400

/**
 * iwl_mvm_protect_session - start / extend the session protection.
 * @mvm: the mvm component
 * @vif: the virtual interface for which the session is issued
 * @duration: the duration of the session in TU.
 * @min_duration: will start a new session if the current session will end
 *	in less than min_duration.
 * @max_delay: maximum delay before starting the time event (in TU)
 * @wait_for_notif: true if it is required that a time event notification be
 *	waited for (that the time event has been scheduled before returning)
 *
 * This function can be used to start a session protection which means that the
 * fw will stay on the channel for %duration_ms milliseconds. This function
 * can block (sleep) until the session starts. This function can also be used
 * to extend a currently running session.
 * This function is meant to be used for BSS association for example, where we
 * want to make sure that the fw stays on the channel during the association.
 */
void iwl_mvm_protect_session(struct iwl_mvm *mvm,
			     struct ieee80211_vif *vif,
			     u32 duration, u32 min_duration,
			     u32 max_delay, bool wait_for_notif);

/**
 * iwl_mvm_stop_session_protection - cancel the session protection.
 * @mvm: the mvm component
 * @vif: the virtual interface for which the session is issued
 *
 * This functions cancels the session protection which is an act of good
 * citizenship. If it is not needed any more it should be canceled because
 * the other bindings wait for the medium during that time.
 * This funtions doesn't sleep.
 */
void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
				      struct ieee80211_vif *vif);

Annotation

Implementation Notes