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/*
* Copyright (c) 2004 Sam Leffler, Errno Consulting
* Copyright (c) 2004 Video54 Technologies, Inc.
* Copyright (c) 2008 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef RC_H
#define RC_H
#include "ath9k.h"
struct ath_softc;
#define ATH_RATE_MAX 30
#define RATE_TABLE_SIZE 64
#define MAX_TX_RATE_PHY 48
/* VALID_ALL - valid for 20/40/Legacy,
* VALID - Legacy only,
* VALID_20 - HT 20 only,
* VALID_40 - HT 40 only */
#define INVALID 0x0
#define VALID 0x1
#define VALID_20 0x2
#define VALID_40 0x4
#define VALID_2040 (VALID_20|VALID_40)
#define VALID_ALL (VALID_2040|VALID)
#define WLAN_RC_PHY_DS(_phy) ((_phy == WLAN_RC_PHY_HT_20_DS) \
|| (_phy == WLAN_RC_PHY_HT_40_DS) \
|| (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
|| (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
#define WLAN_RC_PHY_40(_phy) ((_phy == WLAN_RC_PHY_HT_40_SS) \
|| (_phy == WLAN_RC_PHY_HT_40_DS) \
|| (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
|| (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
#define WLAN_RC_PHY_SGI(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
|| (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
|| (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
|| (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
#define WLAN_RC_PHY_HT(_phy) (_phy >= WLAN_RC_PHY_HT_20_SS)
#define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ? \
(capflag & WLAN_RC_40_FLAG) ? VALID_40 : VALID_20 : VALID))
/* Return TRUE if flag supports HT20 && client supports HT20 or
* return TRUE if flag supports HT40 && client supports HT40.
* This is used becos some rates overlap between HT20/HT40.
*/
#define WLAN_RC_PHY_HT_VALID(flag, capflag) \
(((flag & VALID_20) && !(capflag & WLAN_RC_40_FLAG)) || \
((flag & VALID_40) && (capflag & WLAN_RC_40_FLAG)))
#define WLAN_RC_DS_FLAG (0x01)
#define WLAN_RC_40_FLAG (0x02)
#define WLAN_RC_SGI_FLAG (0x04)
#define WLAN_RC_HT_FLAG (0x08)
/**
* struct ath_rate_table - Rate Control table
* @valid: valid for use in rate control
* @valid_single_stream: valid for use in rate control for
* single stream operation
* @phy: CCK/OFDM
* @ratekbps: rate in Kbits per second
* @user_ratekbps: user rate in Kbits per second
* @ratecode: rate that goes into HW descriptors
* @short_preamble: Mask for enabling short preamble in ratecode for CCK
* @dot11rate: value that goes into supported
* rates info element of MLME
* @ctrl_rate: Index of next lower basic rate, used for duration computation
* @max_4ms_framelen: maximum frame length(bytes) for tx duration
* @probe_interval: interval for rate control to probe for other rates
* @rssi_reduce_interval: interval for rate control to reduce rssi
* @initial_ratemax: initial ratemax value
*/
struct ath_rate_table {
int rate_cnt;
u8 rateCodeToIndex[256];
struct {
int valid;
int valid_single_stream;
u8 phy;
u32 ratekbps;
u32 user_ratekbps;
u8 ratecode;
u8 short_preamble;
u8 dot11rate;
u8 ctrl_rate;
int8_t rssi_ack_validmin;
int8_t rssi_ack_deltamin;
u8 base_index;
u8 cw40index;
u8 sgi_index;
u8 ht_index;
u32 max_4ms_framelen;
u16 lpAckDuration;
u16 spAckDuration;
} info[RATE_TABLE_SIZE];
u32 probe_interval;
u32 rssi_reduce_interval;
u8 initial_ratemax;
};
struct ath_tx_ratectrl_state {
int8_t rssi_thres; /* required rssi for this rate (dB) */
u8 per; /* recent estimate of packet error rate (%) */
};
struct ath_rateset {
u8 rs_nrates;
u8 rs_rates[ATH_RATE_MAX];
};
/**
* struct ath_rate_priv - Rate Control priv data
* @state: RC state
* @rssi_last: last ACK rssi
* @rssi_last_lookup: last ACK rssi used for lookup
* @rssi_last_prev: previous last ACK rssi
* @rssi_last_prev2: 2nd previous last ACK rssi
* @rssi_sum_cnt: count of rssi_sum for averaging
* @rssi_sum_rate: rate that we are averaging
* @rssi_sum: running sum of rssi for averaging
* @probe_rate: rate we are probing at
* @rssi_time: msec timestamp for last ack rssi
* @rssi_down_time: msec timestamp for last down step
* @probe_time: msec timestamp for last probe
* @hw_maxretry_pktcnt: num of packets since we got HW max retry error
* @max_valid_rate: maximum number of valid rate
* @per_down_time: msec timestamp for last PER down step
* @valid_phy_ratecnt: valid rate count
* @rate_max_phy: phy index for the max rate
* @probe_interval: interval for ratectrl to probe for other rates
* @prev_data_rix: rate idx of last data frame
* @ht_cap: HT capabilities
* @single_stream: When TRUE, only single TX stream possible
* @neg_rates: Negotatied rates
* @neg_ht_rates: Negotiated HT rates
*/
struct ath_rate_priv {
int8_t rssi_last;
int8_t rssi_last_lookup;
int8_t rssi_last_prev;
int8_t rssi_last_prev2;
int32_t rssi_sum_cnt;
int32_t rssi_sum_rate;
int32_t rssi_sum;
u8 rate_table_size;
u8 probe_rate;
u8 hw_maxretry_pktcnt;
u8 max_valid_rate;
u8 valid_rate_index[RATE_TABLE_SIZE];
u8 ht_cap;
u8 single_stream;
u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
u8 rc_phy_mode;
u8 rate_max_phy;
u32 rssi_time;
u32 rssi_down_time;
u32 probe_time;
u32 per_down_time;
u32 probe_interval;
u32 prev_data_rix;
u32 tx_triglevel_max;
struct ath_tx_ratectrl_state state[RATE_TABLE_SIZE];
struct ath_rateset neg_rates;
struct ath_rateset neg_ht_rates;
struct ath_rate_softc *asc;
};
struct ath_tx_info_priv {
struct ath_tx_status tx;
int n_frames;
int n_bad_frames;
};
#define ATH_TX_INFO_PRIV(tx_info) \
((struct ath_tx_info_priv *)((tx_info)->rate_driver_data[0]))
void ath_rate_attach(struct ath_softc *sc);
u8 ath_rate_findrateix(struct ath_softc *sc, u8 dot11_rate);
int ath_rate_control_register(void);
void ath_rate_control_unregister(void);
#endif /* RC_H */
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