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 #include "ath9k.h"
  23 /*
  24  * Interface definitions for transmit rate control modules for the
  25  * Atheros driver.
  26  *
  27  * A rate control module is responsible for choosing the transmit rate
  28  * for each data frame.  Management+control frames are always sent at
  29  * a fixed rate.
  30  *
  31  * Only one module may be present at a time; the driver references
  32  * rate control interfaces by symbol name.  If multiple modules are
  33  * to be supported we'll need to switch to a registration-based scheme
  34  * as is currently done, for example, for authentication modules.
  35  *
  36  * An instance of the rate control module is attached to each device
  37  * at attach time and detached when the device is destroyed.  The module
  38  * may associate data with each device and each node (station).  Both
  39  * sets of storage are opaque except for the size of the per-node storage
  40  * which must be provided when the module is attached.
  41  *
  42  * The rate control module is notified for each state transition and
  43  * station association/reassociation.  Otherwise it is queried for a
  44  * rate for each outgoing frame and provided status from each transmitted
  45  * frame.  Any ancillary processing is the responsibility of the module
  46  * (e.g. if periodic processing is required then the module should setup
  47  * it's own timer).
  48  *
  49  * In addition to the transmit rate for each frame the module must also
  50  * indicate the number of attempts to make at the specified rate.  If this
  51  * number is != ATH_TXMAXTRY then an additional callback is made to setup
  52  * additional transmit state.  The rate control code is assumed to write
  53  * this additional data directly to the transmit descriptor.
  54  */
  55
  56 struct ath_softc;
  57
  58 #define TRUE 1
  59 #define FALSE 0
  60
  61 #define ATH_RATE_MAX    30
  62
  63 #define WLAN_PHY_HT_20_SS       WLAN_RC_PHY_HT_20_SS
  64 #define WLAN_PHY_HT_20_DS       WLAN_RC_PHY_HT_20_DS
  65 #define WLAN_PHY_HT_20_DS_HGI   WLAN_RC_PHY_HT_20_DS_HGI
  66 #define WLAN_PHY_HT_40_SS       WLAN_RC_PHY_HT_40_SS
  67 #define WLAN_PHY_HT_40_SS_HGI   WLAN_RC_PHY_HT_40_SS_HGI
  68 #define WLAN_PHY_HT_40_DS       WLAN_RC_PHY_HT_40_DS
  69 #define WLAN_PHY_HT_40_DS_HGI   WLAN_RC_PHY_HT_40_DS_HGI
  70
  71 #define WLAN_PHY_OFDM   PHY_OFDM
  72 #define WLAN_PHY_CCK    PHY_CCK
  73
  74 #define TRUE_20         0x2
  75 #define TRUE_40         0x4
  76 #define TRUE_2040       (TRUE_20|TRUE_40)
  77 #define TRUE_ALL        (TRUE_2040|TRUE)
  78
  79 enum {
  80         WLAN_RC_PHY_HT_20_SS = 4,
  81         WLAN_RC_PHY_HT_20_DS,
  82         WLAN_RC_PHY_HT_40_SS,
  83         WLAN_RC_PHY_HT_40_DS,
  84         WLAN_RC_PHY_HT_20_SS_HGI,
  85         WLAN_RC_PHY_HT_20_DS_HGI,
  86         WLAN_RC_PHY_HT_40_SS_HGI,
  87         WLAN_RC_PHY_HT_40_DS_HGI,
  88         WLAN_RC_PHY_MAX
  89 };
  90
  91 #define WLAN_RC_PHY_DS(_phy)   ((_phy == WLAN_RC_PHY_HT_20_DS)          \
  92                                 || (_phy == WLAN_RC_PHY_HT_40_DS)       \
  93                                 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI)   \
  94                                 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
  95 #define WLAN_RC_PHY_40(_phy)   ((_phy == WLAN_RC_PHY_HT_40_SS)          \
  96                                 || (_phy == WLAN_RC_PHY_HT_40_DS)       \
  97                                 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI)   \
  98                                 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
  99 #define WLAN_RC_PHY_SGI(_phy)  ((_phy == WLAN_RC_PHY_HT_20_SS_HGI)      \
 100                                 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI)   \
 101                                 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI)   \
 102                                 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
 103
 104 #define WLAN_RC_PHY_HT(_phy)    (_phy >= WLAN_RC_PHY_HT_20_SS)
 105
 106 /* Returns the capflag mode */
 107 #define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ?       \
 108                 (capflag & WLAN_RC_40_FLAG) ? TRUE_40 : TRUE_20 : TRUE))
 109
 110 /* Return TRUE if flag supports HT20 && client supports HT20 or
 111  * return TRUE if flag supports HT40 && client supports HT40.
 112  * This is used becos some rates overlap between HT20/HT40.
 113  */
 114
 115 #define WLAN_RC_PHY_HT_VALID(flag, capflag) (((flag & TRUE_20) && !(capflag \
 116                                 & WLAN_RC_40_FLAG)) || ((flag & TRUE_40) && \
 117                                   (capflag & WLAN_RC_40_FLAG)))
 118
 119 #define WLAN_RC_DS_FLAG         (0x01)
 120 #define WLAN_RC_40_FLAG         (0x02)
 121 #define WLAN_RC_SGI_FLAG        (0x04)
 122 #define WLAN_RC_HT_FLAG         (0x08)
 123
 124 #define RATE_TABLE_SIZE         64
 125
 126 /**
 127  * struct ath_rate_table - Rate Control table
 128  * @valid: valid for use in rate control
 129  * @valid_single_stream: valid for use in rate control for
 130  *      single stream operation
 131  * @phy: CCK/OFDM
 132  * @ratekbps: rate in Kbits per second
 133  * @user_ratekbps: user rate in Kbits per second
 134  * @ratecode: rate that goes into HW descriptors
 135  * @short_preamble: Mask for enabling short preamble in ratecode for CCK
 136  * @dot11rate: value that goes into supported
 137  *      rates info element of MLME
 138  * @ctrl_rate: Index of next lower basic rate, used for duration computation
 139  * @max_4ms_framelen: maximum frame length(bytes) for tx duration
 140  * @probe_interval: interval for rate control to probe for other rates
 141  * @rssi_reduce_interval: interval for rate control to reduce rssi
 142  * @initial_ratemax: initial ratemax value used in ath_rc_sib_update()
 143  */
 144 struct ath_rate_table {
 145         int rate_cnt;
 146         u8 rateCodeToIndex[256];
 147         struct {
 148                 int valid;
 149                 int valid_single_stream;
 150                 u8 phy;
 151                 u32 ratekbps;
 152                 u32 user_ratekbps;
 153                 u8 ratecode;
 154                 u8 short_preamble;
 155                 u8 dot11rate;
 156                 u8 ctrl_rate;
 157                 int8_t rssi_ack_validmin;
 158                 int8_t rssi_ack_deltamin;
 159                 u8 base_index;
 160                 u8 cw40index;
 161                 u8 sgi_index;
 162                 u8 ht_index;
 163                 u32 max_4ms_framelen;
 164                 u16 lpAckDuration;
 165                 u16 spAckDuration;
 166         } info[RATE_TABLE_SIZE];
 167         u32 probe_interval;
 168         u32 rssi_reduce_interval;
 169         u8 initial_ratemax;
 170 };
 171
 172 #define ATH_RC_PROBE_ALLOWED            0x00000001
 173 #define ATH_RC_MINRATE_LASTRATE         0x00000002
 174
 175 /*
 176  * State structures for new rate adaptation code
 177  */
 178 #define MAX_TX_RATE_TBL         64
 179 #define MAX_TX_RATE_PHY         48
 180
 181 struct ath_tx_ratectrl_state {
 182         int8_t rssi_thres;      /* required rssi for this rate (dB) */
 183         u8 per;                 /* recent estimate of packet error rate (%) */
 184 };
 185
 186 struct ath_rateset {
 187         u8 rs_nrates;
 188         u8 rs_rates[ATH_RATE_MAX];
 189 };
 190
 191 /**
 192  * struct ath_rate_node - Rate Control priv data
 193  * @state: RC state
 194  * @rssi_last: last ACK rssi
 195  * @rssi_last_lookup: last ACK rssi used for lookup
 196  * @rssi_last_prev: previous last ACK rssi
 197  * @rssi_last_prev2: 2nd previous last ACK rssi
 198  * @rssi_sum_cnt: count of rssi_sum for averaging
 199  * @rssi_sum_rate: rate that we are averaging
 200  * @rssi_sum: running sum of rssi for averaging
 201  * @probe_rate: rate we are probing at
 202  * @rssi_time: msec timestamp for last ack rssi
 203  * @rssi_down_time: msec timestamp for last down step
 204  * @probe_time: msec timestamp for last probe
 205  * @hw_maxretry_pktcnt: num of packets since we got HW max retry error
 206  * @max_valid_rate: maximum number of valid rate
 207  * @per_down_time: msec timestamp for last PER down step
 208  * @valid_phy_ratecnt: valid rate count
 209  * @rate_max_phy: phy index for the max rate
 210  * @probe_interval: interval for ratectrl to probe for other rates
 211  * @prev_data_rix: rate idx of last data frame
 212  * @ht_cap: HT capabilities
 213  * @single_stream: When TRUE, only single TX stream possible
 214  * @neg_rates: Negotatied rates
 215  * @neg_ht_rates: Negotiated HT rates
 216  */
 217
 218 /* per-node state */
 219 struct ath_rate_node {
 220         int8_t rssi_last;
 221         int8_t rssi_last_lookup;
 222         int8_t rssi_last_prev;
 223         int8_t rssi_last_prev2;
 224         int32_t rssi_sum_cnt;
 225         int32_t rssi_sum_rate;
 226         int32_t rssi_sum;
 227         u8 rate_table_size;
 228         u8 probe_rate;
 229         u8 hw_maxretry_pktcnt;
 230         u8 max_valid_rate;
 231         u8 valid_rate_index[MAX_TX_RATE_TBL];
 232         u8 ht_cap;
 233         u8 single_stream;
 234         u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
 235         u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][MAX_TX_RATE_TBL];
 236         u8 rc_phy_mode;
 237         u8 rate_max_phy;
 238         u32 rssi_time;
 239         u32 rssi_down_time;
 240         u32 probe_time;
 241         u32 per_down_time;
 242         u32 probe_interval;
 243         u32 prev_data_rix;
 244         u32 tx_triglevel_max;
 245         struct ath_tx_ratectrl_state state[MAX_TX_RATE_TBL];
 246         struct ath_rateset neg_rates;
 247         struct ath_rateset neg_ht_rates;
 248         struct ath_rate_softc *asc;
 249 };
 250
 251 struct ath_tx_info_priv {
 252         struct ath_tx_status tx;
 253         int n_frames;
 254         int n_bad_frames;
 255 };
 256
 257 void ath_rate_attach(struct ath_softc *sc);
 258 u8 ath_rate_findrateix(struct ath_softc *sc, u8 dot11_rate);
 259 int ath_rate_control_register(void);
 260 void ath_rate_control_unregister(void);
 261
 262 #endif /* RC_H */