drivers/net/wireless/ath9k/rc.h

   1 /*
   2  * Copyright (c) 2004 Sam Leffler, Errno Consulting
   3  * Copyright (c) 2004 Video54 Technologies, Inc.
   4  * Copyright (c) 2008 Atheros Communications Inc.
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #ifndef RC_H
  20 #define RC_H
  21
  22 struct ath_softc;
  23
  24 #define ATH_RATE_MAX     30
  25 #define RATE_TABLE_SIZE  64
  26 #define MAX_TX_RATE_PHY  48
  27 #define WLAN_CTRL_FRAME_SIZE (2+2+6+4)
  28
  29 /* VALID_ALL - valid for 20/40/Legacy,
  30  * VALID - Legacy only,
  31  * VALID_20 - HT 20 only,
  32  * VALID_40 - HT 40 only */
  33
  34 #define INVALID    0x0
  35 #define VALID      0x1
  36 #define VALID_20   0x2
  37 #define VALID_40   0x4
  38 #define VALID_2040 (VALID_20|VALID_40)
  39 #define VALID_ALL  (VALID_2040|VALID)
  40
  41 enum {
  42         WLAN_RC_PHY_OFDM,
  43         WLAN_RC_PHY_CCK,
  44         WLAN_RC_PHY_HT_20_SS,
  45         WLAN_RC_PHY_HT_20_DS,
  46         WLAN_RC_PHY_HT_40_SS,
  47         WLAN_RC_PHY_HT_40_DS,
  48         WLAN_RC_PHY_HT_20_SS_HGI,
  49         WLAN_RC_PHY_HT_20_DS_HGI,
  50         WLAN_RC_PHY_HT_40_SS_HGI,
  51         WLAN_RC_PHY_HT_40_DS_HGI,
  52         WLAN_RC_PHY_MAX
  53 };
  54
  55 #define WLAN_RC_PHY_DS(_phy)   ((_phy == WLAN_RC_PHY_HT_20_DS)          \
  56                                 || (_phy == WLAN_RC_PHY_HT_40_DS)       \
  57                                 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI)   \
  58                                 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
  59 #define WLAN_RC_PHY_40(_phy)   ((_phy == WLAN_RC_PHY_HT_40_SS)          \
  60                                 || (_phy == WLAN_RC_PHY_HT_40_DS)       \
  61                                 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI)   \
  62                                 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
  63 #define WLAN_RC_PHY_SGI(_phy)  ((_phy == WLAN_RC_PHY_HT_20_SS_HGI)      \
  64                                 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI)   \
  65                                 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI)   \
  66                                 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
  67
  68 #define WLAN_RC_PHY_HT(_phy)    (_phy >= WLAN_RC_PHY_HT_20_SS)
  69
  70 #define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ?       \
  71                 (capflag & WLAN_RC_40_FLAG) ? VALID_40 : VALID_20 : VALID))
  72
  73 /* Return TRUE if flag supports HT20 && client supports HT20 or
  74  * return TRUE if flag supports HT40 && client supports HT40.
  75  * This is used becos some rates overlap between HT20/HT40.
  76  */
  77 #define WLAN_RC_PHY_HT_VALID(flag, capflag)                     \
  78         (((flag & VALID_20) && !(capflag & WLAN_RC_40_FLAG)) || \
  79          ((flag & VALID_40) && (capflag & WLAN_RC_40_FLAG)))
  80
  81 #define WLAN_RC_DS_FLAG         (0x01)
  82 #define WLAN_RC_40_FLAG         (0x02)
  83 #define WLAN_RC_SGI_FLAG        (0x04)
  84 #define WLAN_RC_HT_FLAG         (0x08)
  85
  86 /**
  87  * struct ath_rate_table - Rate Control table
  88  * @valid: valid for use in rate control
  89  * @valid_single_stream: valid for use in rate control for
  90  *      single stream operation
  91  * @phy: CCK/OFDM
  92  * @ratekbps: rate in Kbits per second
  93  * @user_ratekbps: user rate in Kbits per second
  94  * @ratecode: rate that goes into HW descriptors
  95  * @short_preamble: Mask for enabling short preamble in ratecode for CCK
  96  * @dot11rate: value that goes into supported
  97  *      rates info element of MLME
  98  * @ctrl_rate: Index of next lower basic rate, used for duration computation
  99  * @max_4ms_framelen: maximum frame length(bytes) for tx duration
 100  * @probe_interval: interval for rate control to probe for other rates
 101  * @rssi_reduce_interval: interval for rate control to reduce rssi
 102  * @initial_ratemax: initial ratemax value
 103  */
 104 struct ath_rate_table {
 105         int rate_cnt;
 106         struct {
 107                 int valid;
 108                 int valid_single_stream;
 109                 u8 phy;
 110                 u32 ratekbps;
 111                 u32 user_ratekbps;
 112                 u8 ratecode;
 113                 u8 short_preamble;
 114                 u8 dot11rate;
 115                 u8 ctrl_rate;
 116                 int8_t rssi_ack_validmin;
 117                 int8_t rssi_ack_deltamin;
 118                 u8 base_index;
 119                 u8 cw40index;
 120                 u8 sgi_index;
 121                 u8 ht_index;
 122                 u32 max_4ms_framelen;
 123         } info[RATE_TABLE_SIZE];
 124         u32 probe_interval;
 125         u32 rssi_reduce_interval;
 126         u8 initial_ratemax;
 127 };
 128
 129 struct ath_tx_ratectrl_state {
 130         int8_t rssi_thres;      /* required rssi for this rate (dB) */
 131         u8 per;                 /* recent estimate of packet error rate (%) */
 132 };
 133
 134 struct ath_rateset {
 135         u8 rs_nrates;
 136         u8 rs_rates[ATH_RATE_MAX];
 137 };
 138
 139 /**
 140  * struct ath_rate_priv - Rate Control priv data
 141  * @state: RC state
 142  * @rssi_last: last ACK rssi
 143  * @rssi_last_lookup: last ACK rssi used for lookup
 144  * @rssi_last_prev: previous last ACK rssi
 145  * @rssi_last_prev2: 2nd previous last ACK rssi
 146  * @rssi_sum_cnt: count of rssi_sum for averaging
 147  * @rssi_sum_rate: rate that we are averaging
 148  * @rssi_sum: running sum of rssi for averaging
 149  * @probe_rate: rate we are probing at
 150  * @rssi_time: msec timestamp for last ack rssi
 151  * @rssi_down_time: msec timestamp for last down step
 152  * @probe_time: msec timestamp for last probe
 153  * @hw_maxretry_pktcnt: num of packets since we got HW max retry error
 154  * @max_valid_rate: maximum number of valid rate
 155  * @per_down_time: msec timestamp for last PER down step
 156  * @valid_phy_ratecnt: valid rate count
 157  * @rate_max_phy: phy index for the max rate
 158  * @probe_interval: interval for ratectrl to probe for other rates
 159  * @prev_data_rix: rate idx of last data frame
 160  * @ht_cap: HT capabilities
 161  * @single_stream: When TRUE, only single TX stream possible
 162  * @neg_rates: Negotatied rates
 163  * @neg_ht_rates: Negotiated HT rates
 164  */
 165 struct ath_rate_priv {
 166         int8_t rssi_last;
 167         int8_t rssi_last_lookup;
 168         int8_t rssi_last_prev;
 169         int8_t rssi_last_prev2;
 170         int32_t rssi_sum_cnt;
 171         int32_t rssi_sum_rate;
 172         int32_t rssi_sum;
 173         u8 rate_table_size;
 174         u8 probe_rate;
 175         u8 hw_maxretry_pktcnt;
 176         u8 max_valid_rate;
 177         u8 valid_rate_index[RATE_TABLE_SIZE];
 178         u8 ht_cap;
 179         u8 single_stream;
 180         u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
 181         u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
 182         u8 rc_phy_mode;
 183         u8 rate_max_phy;
 184         u32 rssi_time;
 185         u32 rssi_down_time;
 186         u32 probe_time;
 187         u32 per_down_time;
 188         u32 probe_interval;
 189         u32 prev_data_rix;
 190         u32 tx_triglevel_max;
 191         struct ath_tx_ratectrl_state state[RATE_TABLE_SIZE];
 192         struct ath_rateset neg_rates;
 193         struct ath_rateset neg_ht_rates;
 194         struct ath_rate_softc *asc;
 195 };
 196
 197 struct ath_tx_info_priv {
 198         struct ath_tx_status tx;
 199         int n_frames;
 200         int n_bad_frames;
 201         bool update_rc;
 202 };
 203
 204 #define ATH_TX_INFO_PRIV(tx_info) \
 205         ((struct ath_tx_info_priv *)((tx_info)->rate_driver_data[0]))
 206
 207 void ath_rate_attach(struct ath_softc *sc);
 208 u8 ath_rate_findrateix(struct ath_softc *sc, u8 dot11_rate);
 209 int ath_rate_control_register(void);
 210 void ath_rate_control_unregister(void);
 211
 212 #endif /* RC_H */