forked from Minki/linux
d9fe60dea7
This patch cleans up a number of things:
* the unusable definition of the HT capabilities/HT information
information elements
* variable names that are hard to understand
* mac80211: move ieee80211_handle_ht to ht.c and remove the unused
enable_ht parameter
* mac80211: fix bug with MCS rate 32 in ieee80211_handle_ht
* mac80211: fix bug with casting the result of ieee80211_bss_get_ie
to an information element _contents_ rather than the
whole element, add size checking (another out-of-bounds
access bug fixed!)
* mac80211: remove some unused return values in favour of BUG_ON
checking
* a few minor other things
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
326 lines
10 KiB
C
326 lines
10 KiB
C
/*
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* Copyright (c) 2004 Sam Leffler, Errno Consulting
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* Copyright (c) 2004 Video54 Technologies, Inc.
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* Copyright (c) 2008 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef RC_H
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#define RC_H
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#include "ath9k.h"
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/*
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* Interface definitions for transmit rate control modules for the
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* Atheros driver.
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*
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* A rate control module is responsible for choosing the transmit rate
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* for each data frame. Management+control frames are always sent at
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* a fixed rate.
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*
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* Only one module may be present at a time; the driver references
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* rate control interfaces by symbol name. If multiple modules are
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* to be supported we'll need to switch to a registration-based scheme
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* as is currently done, for example, for authentication modules.
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*
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* An instance of the rate control module is attached to each device
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* at attach time and detached when the device is destroyed. The module
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* may associate data with each device and each node (station). Both
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* sets of storage are opaque except for the size of the per-node storage
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* which must be provided when the module is attached.
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*
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* The rate control module is notified for each state transition and
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* station association/reassociation. Otherwise it is queried for a
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* rate for each outgoing frame and provided status from each transmitted
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* frame. Any ancillary processing is the responsibility of the module
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* (e.g. if periodic processing is required then the module should setup
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* it's own timer).
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*
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* In addition to the transmit rate for each frame the module must also
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* indicate the number of attempts to make at the specified rate. If this
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* number is != ATH_TXMAXTRY then an additional callback is made to setup
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* additional transmit state. The rate control code is assumed to write
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* this additional data directly to the transmit descriptor.
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*/
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struct ath_softc;
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#define TRUE 1
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#define FALSE 0
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#define ATH_RATE_MAX 30
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enum ieee80211_fixed_rate_mode {
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IEEE80211_FIXED_RATE_NONE = 0,
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IEEE80211_FIXED_RATE_MCS = 1 /* HT rates */
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};
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/*
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* Use the hal os glue code to get ms time
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*/
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#define IEEE80211_RATE_IDX_ENTRY(val, idx) (((val&(0xff<<(idx*8)))>>(idx*8)))
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#define WLAN_PHY_HT_20_SS WLAN_RC_PHY_HT_20_SS
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#define WLAN_PHY_HT_20_DS WLAN_RC_PHY_HT_20_DS
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#define WLAN_PHY_HT_20_DS_HGI WLAN_RC_PHY_HT_20_DS_HGI
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#define WLAN_PHY_HT_40_SS WLAN_RC_PHY_HT_40_SS
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#define WLAN_PHY_HT_40_SS_HGI WLAN_RC_PHY_HT_40_SS_HGI
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#define WLAN_PHY_HT_40_DS WLAN_RC_PHY_HT_40_DS
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#define WLAN_PHY_HT_40_DS_HGI WLAN_RC_PHY_HT_40_DS_HGI
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#define WLAN_PHY_OFDM PHY_OFDM
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#define WLAN_PHY_CCK PHY_CCK
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#define TRUE_20 0x2
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#define TRUE_40 0x4
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#define TRUE_2040 (TRUE_20|TRUE_40)
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#define TRUE_ALL (TRUE_2040|TRUE)
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enum {
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WLAN_RC_PHY_HT_20_SS = 4,
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WLAN_RC_PHY_HT_20_DS,
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WLAN_RC_PHY_HT_40_SS,
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WLAN_RC_PHY_HT_40_DS,
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WLAN_RC_PHY_HT_20_SS_HGI,
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WLAN_RC_PHY_HT_20_DS_HGI,
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WLAN_RC_PHY_HT_40_SS_HGI,
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WLAN_RC_PHY_HT_40_DS_HGI,
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WLAN_RC_PHY_MAX
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};
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#define WLAN_RC_PHY_DS(_phy) ((_phy == WLAN_RC_PHY_HT_20_DS) \
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|| (_phy == WLAN_RC_PHY_HT_40_DS) \
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|| (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
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|| (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
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#define WLAN_RC_PHY_40(_phy) ((_phy == WLAN_RC_PHY_HT_40_SS) \
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|| (_phy == WLAN_RC_PHY_HT_40_DS) \
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|| (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
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|| (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
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#define WLAN_RC_PHY_SGI(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
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|| (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
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|| (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
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|| (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
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#define WLAN_RC_PHY_HT(_phy) (_phy >= WLAN_RC_PHY_HT_20_SS)
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/* Returns the capflag mode */
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#define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ? \
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(capflag & WLAN_RC_40_FLAG) ? TRUE_40 : TRUE_20 : TRUE))
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/* Return TRUE if flag supports HT20 && client supports HT20 or
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* return TRUE if flag supports HT40 && client supports HT40.
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* This is used becos some rates overlap between HT20/HT40.
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*/
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#define WLAN_RC_PHY_HT_VALID(flag, capflag) (((flag & TRUE_20) && !(capflag \
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& WLAN_RC_40_FLAG)) || ((flag & TRUE_40) && \
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(capflag & WLAN_RC_40_FLAG)))
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#define WLAN_RC_DS_FLAG (0x01)
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#define WLAN_RC_40_FLAG (0x02)
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#define WLAN_RC_SGI_FLAG (0x04)
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#define WLAN_RC_HT_FLAG (0x08)
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#define RATE_TABLE_SIZE 64
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/**
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* struct ath_rate_table - Rate Control table
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* @valid: valid for use in rate control
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* @valid_single_stream: valid for use in rate control for
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* single stream operation
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* @phy: CCK/OFDM
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* @ratekbps: rate in Kbits per second
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* @user_ratekbps: user rate in Kbits per second
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* @ratecode: rate that goes into HW descriptors
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* @short_preamble: Mask for enabling short preamble in ratecode for CCK
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* @dot11rate: value that goes into supported
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* rates info element of MLME
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* @ctrl_rate: Index of next lower basic rate, used for duration computation
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* @max_4ms_framelen: maximum frame length(bytes) for tx duration
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* @probe_interval: interval for rate control to probe for other rates
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* @rssi_reduce_interval: interval for rate control to reduce rssi
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* @initial_ratemax: initial ratemax value used in ath_rc_sib_update()
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*/
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struct ath_rate_table {
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int rate_cnt;
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struct {
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int valid;
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int valid_single_stream;
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u8 phy;
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u32 ratekbps;
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u32 user_ratekbps;
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u8 ratecode;
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u8 short_preamble;
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u8 dot11rate;
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u8 ctrl_rate;
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int8_t rssi_ack_validmin;
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int8_t rssi_ack_deltamin;
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u8 base_index;
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u8 cw40index;
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u8 sgi_index;
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u8 ht_index;
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u32 max_4ms_framelen;
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} info[RATE_TABLE_SIZE];
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u32 probe_interval;
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u32 rssi_reduce_interval;
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u8 initial_ratemax;
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};
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#define ATH_RC_PROBE_ALLOWED 0x00000001
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#define ATH_RC_MINRATE_LASTRATE 0x00000002
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struct ath_rc_series {
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u8 rix;
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u8 tries;
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u8 flags;
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u32 max_4ms_framelen;
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};
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/* rcs_flags definition */
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#define ATH_RC_DS_FLAG 0x01
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#define ATH_RC_CW40_FLAG 0x02 /* CW 40 */
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#define ATH_RC_SGI_FLAG 0x04 /* Short Guard Interval */
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#define ATH_RC_HT_FLAG 0x08 /* HT */
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#define ATH_RC_RTSCTS_FLAG 0x10 /* RTS-CTS */
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/*
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* State structures for new rate adaptation code
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*/
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#define MAX_TX_RATE_TBL 64
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#define MAX_TX_RATE_PHY 48
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struct ath_tx_ratectrl_state {
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int8_t rssi_thres; /* required rssi for this rate (dB) */
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u8 per; /* recent estimate of packet error rate (%) */
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};
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/**
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* struct ath_tx_ratectrl - TX Rate control Information
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* @state: RC state
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* @rssi_last: last ACK rssi
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* @rssi_last_lookup: last ACK rssi used for lookup
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* @rssi_last_prev: previous last ACK rssi
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* @rssi_last_prev2: 2nd previous last ACK rssi
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* @rssi_sum_cnt: count of rssi_sum for averaging
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* @rssi_sum_rate: rate that we are averaging
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* @rssi_sum: running sum of rssi for averaging
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* @probe_rate: rate we are probing at
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* @rssi_time: msec timestamp for last ack rssi
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* @rssi_down_time: msec timestamp for last down step
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* @probe_time: msec timestamp for last probe
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* @hw_maxretry_pktcnt: num of packets since we got HW max retry error
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* @max_valid_rate: maximum number of valid rate
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* @per_down_time: msec timestamp for last PER down step
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* @valid_phy_ratecnt: valid rate count
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* @rate_max_phy: phy index for the max rate
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* @probe_interval: interval for ratectrl to probe for other rates
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*/
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struct ath_tx_ratectrl {
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struct ath_tx_ratectrl_state state[MAX_TX_RATE_TBL];
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int8_t rssi_last;
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int8_t rssi_last_lookup;
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int8_t rssi_last_prev;
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int8_t rssi_last_prev2;
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int32_t rssi_sum_cnt;
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int32_t rssi_sum_rate;
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int32_t rssi_sum;
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u8 rate_table_size;
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u8 probe_rate;
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u32 rssi_time;
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u32 rssi_down_time;
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u32 probe_time;
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u8 hw_maxretry_pktcnt;
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u8 max_valid_rate;
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u8 valid_rate_index[MAX_TX_RATE_TBL];
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u32 per_down_time;
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/* 11n state */
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u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
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u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][MAX_TX_RATE_TBL];
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u8 rc_phy_mode;
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u8 rate_max_phy;
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u32 probe_interval;
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};
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struct ath_rateset {
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u8 rs_nrates;
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u8 rs_rates[ATH_RATE_MAX];
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};
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/* per-device state */
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struct ath_rate_softc {
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/* phy tables that contain rate control data */
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const void *hw_rate_table[ATH9K_MODE_MAX];
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/* -1 or index of fixed rate */
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int fixedrix;
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};
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/* per-node state */
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struct ath_rate_node {
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struct ath_tx_ratectrl tx_ratectrl;
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/* rate idx of last data frame */
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u32 prev_data_rix;
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/* ht capabilities */
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u8 ht_cap;
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/* When TRUE, only single stream Tx possible */
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u8 single_stream;
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/* Negotiated rates */
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struct ath_rateset neg_rates;
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/* Negotiated HT rates */
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struct ath_rateset neg_ht_rates;
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struct ath_rate_softc *asc;
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struct ath_vap *avp;
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};
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/* Driver data of ieee80211_tx_info */
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struct ath_tx_info_priv {
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struct ath_rc_series rcs[4];
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struct ath_tx_status tx;
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int n_frames;
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int n_bad_frames;
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u8 min_rate;
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};
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/*
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* Attach/detach a rate control module.
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*/
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struct ath_rate_softc *ath_rate_attach(struct ath_hal *ah);
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void ath_rate_detach(struct ath_rate_softc *asc);
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/*
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* Update/reset rate control state for 802.11 state transitions.
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* Important mostly as the analog to ath_rate_newassoc when operating
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* in station mode.
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*/
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void ath_rc_node_update(struct ieee80211_hw *hw, struct ath_rate_node *rc_priv);
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void ath_rate_newstate(struct ath_softc *sc, struct ath_vap *avp);
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/*
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* Return rate index for given Dot11 Rate.
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*/
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u8 ath_rate_findrateix(struct ath_softc *sc,
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u8 dot11_rate);
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/* Routines to register/unregister rate control algorithm */
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int ath_rate_control_register(void);
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void ath_rate_control_unregister(void);
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#endif /* RC_H */
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