141 lines
5.7 KiB
C
141 lines
5.7 KiB
C
/*-
|
|
* Copyright (c) 2004 Sam Leffler, Errno Consulting
|
|
* Copyright (c) 2004 Video54 Technologies, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer,
|
|
without modification.
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
|
|
* redistribution must be conditioned upon including a substantially
|
|
* similar Disclaimer requirement for further binary redistribution.
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
|
* of any contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* NO WARRANTY
|
|
* 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 NONINFRINGEMENT, MERCHANTIBILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#ifndef _ATH_RATECTRL_H_
|
|
#define _ATH_RATECTRL_H_
|
|
|
|
/*
|
|
* Interface definitions for transmit rate control modules for the
|
|
* Atheros driver.
|
|
*
|
|
* A rate control module is responsible for choosing the transmit rate
|
|
* for each data frame. Management+control frames are always sent at
|
|
* a fixed rate.
|
|
*
|
|
* Only one module may be present at a time; the driver references
|
|
* rate control interfaces by symbol name. If multiple modules are
|
|
* to be supported we'll need to switch to a registration-based scheme
|
|
* as is currently done, for example, for authentication modules.
|
|
*
|
|
* An instance of the rate control module is attached to each device
|
|
* at attach time and detached when the device is destroyed. The module
|
|
* may associate data with each device and each node (station). Both
|
|
* sets of storage are opaque except for the size of the per-node storage
|
|
* which must be provided when the module is attached.
|
|
*
|
|
* The rate control module is notified for each state transition and
|
|
* station association/reassociation. Otherwise it is queried for a
|
|
* rate for each outgoing frame and provided status from each transmitted
|
|
* frame. Any ancillary processing is the responsibility of the module
|
|
* (e.g. if periodic processing is required then the module should setup
|
|
* it's own timer).
|
|
*
|
|
* In addition to the transmit rate for each frame the module must also
|
|
* indicate the number of attempts to make at the specified rate. If this
|
|
* number is != ATH_TXMAXTRY then an additional callback is made to setup
|
|
* additional transmit state. The rate control code is assumed to write
|
|
* this additional data directly to the transmit descriptor.
|
|
*/
|
|
struct ath_softc;
|
|
struct ath_node;
|
|
struct ath_desc;
|
|
|
|
struct ath_ratectrl {
|
|
size_t arc_space; /* space required for per-node state */
|
|
};
|
|
/*
|
|
* Attach/detach a rate control module.
|
|
*/
|
|
struct ath_ratectrl *ath_rate_attach(struct ath_softc *);
|
|
void ath_rate_detach(struct ath_ratectrl *);
|
|
|
|
|
|
/*
|
|
* State storage handling.
|
|
*/
|
|
/*
|
|
* Initialize per-node state already allocated for the specified
|
|
* node; this space can be assumed initialized to zero.
|
|
*/
|
|
void ath_rate_node_init(struct ath_softc *, struct ath_node *);
|
|
/*
|
|
* Cleanup any per-node state prior to the node being reclaimed.
|
|
*/
|
|
void ath_rate_node_cleanup(struct ath_softc *, struct ath_node *);
|
|
/*
|
|
* Update rate control state on station associate/reassociate
|
|
* (when operating as an ap or for nodes discovered when operating
|
|
* in ibss mode).
|
|
*/
|
|
void ath_rate_newassoc(struct ath_softc *, struct ath_node *,
|
|
int isNewAssociation);
|
|
/*
|
|
* Update/reset rate control state for 802.11 state transitions.
|
|
* Important mostly as the analog to ath_rate_newassoc when operating
|
|
* in station mode.
|
|
*/
|
|
void ath_rate_newstate(struct ath_softc *, enum ieee80211_state);
|
|
|
|
/*
|
|
* Transmit handling.
|
|
*/
|
|
/*
|
|
* Return the transmit info for a data packet. If multi-rate state
|
|
* is to be setup then try0 should contain a value other than ATH_TXMATRY
|
|
* and ath_rate_setupxtxdesc will be called after deciding if the frame
|
|
* can be transmitted with multi-rate retry.
|
|
*/
|
|
void ath_rate_findrate(struct ath_softc *, struct ath_node *,
|
|
HAL_BOOL shortPreamble, size_t frameLen,
|
|
u_int8_t *rix, int *try0, u_int8_t *txrate);
|
|
/*
|
|
* Setup any extended (multi-rate) descriptor state for a data packet.
|
|
* The rate index returned by ath_rate_findrate is passed back in.
|
|
*/
|
|
void ath_rate_setupxtxdesc(struct ath_softc *, struct ath_node *,
|
|
struct ath_desc *, HAL_BOOL shortPreamble, u_int8_t rix);
|
|
/*
|
|
* Update rate control state for a packet associated with the
|
|
* supplied transmit descriptor. The routine is invoked both
|
|
* for packets that were successfully sent and for those that
|
|
* failed (consult the descriptor for details).
|
|
*/
|
|
void ath_rate_tx_complete(struct ath_softc *, struct ath_node *,
|
|
const struct ath_desc *);
|
|
#endif /* _ATH_RATECTRL_H_ */
|