2 * Copyright (c) 2004 Sam Leffler, Errno Consulting
3 * Copyright (c) 2004 Video54 Technologies, Inc.
4 * Copyright (c) 2008 Atheros Communications Inc.
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.
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.
26 #define ATH_RATE_MAX 30
27 #define RATE_TABLE_SIZE 64
28 #define MAX_TX_RATE_PHY 48
30 /* VALID_ALL - valid for 20/40/Legacy,
31 * VALID - Legacy only,
32 * VALID_20 - HT 20 only,
33 * VALID_40 - HT 40 only */
39 #define VALID_2040 (VALID_20|VALID_40)
40 #define VALID_ALL (VALID_2040|VALID)
42 #define WLAN_RC_PHY_DS(_phy) ((_phy == WLAN_RC_PHY_HT_20_DS) \
43 || (_phy == WLAN_RC_PHY_HT_40_DS) \
44 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
45 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
46 #define WLAN_RC_PHY_40(_phy) ((_phy == WLAN_RC_PHY_HT_40_SS) \
47 || (_phy == WLAN_RC_PHY_HT_40_DS) \
48 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
49 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
50 #define WLAN_RC_PHY_SGI(_phy) ((_phy == WLAN_RC_PHY_HT_20_SS_HGI) \
51 || (_phy == WLAN_RC_PHY_HT_20_DS_HGI) \
52 || (_phy == WLAN_RC_PHY_HT_40_SS_HGI) \
53 || (_phy == WLAN_RC_PHY_HT_40_DS_HGI))
55 #define WLAN_RC_PHY_HT(_phy) (_phy >= WLAN_RC_PHY_HT_20_SS)
57 #define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ? \
58 (capflag & WLAN_RC_40_FLAG) ? VALID_40 : VALID_20 : VALID))
60 /* Return TRUE if flag supports HT20 && client supports HT20 or
61 * return TRUE if flag supports HT40 && client supports HT40.
62 * This is used becos some rates overlap between HT20/HT40.
64 #define WLAN_RC_PHY_HT_VALID(flag, capflag) \
65 (((flag & VALID_20) && !(capflag & WLAN_RC_40_FLAG)) || \
66 ((flag & VALID_40) && (capflag & WLAN_RC_40_FLAG)))
68 #define WLAN_RC_DS_FLAG (0x01)
69 #define WLAN_RC_40_FLAG (0x02)
70 #define WLAN_RC_SGI_FLAG (0x04)
71 #define WLAN_RC_HT_FLAG (0x08)
74 * struct ath_rate_table - Rate Control table
75 * @valid: valid for use in rate control
76 * @valid_single_stream: valid for use in rate control for
77 * single stream operation
79 * @ratekbps: rate in Kbits per second
80 * @user_ratekbps: user rate in Kbits per second
81 * @ratecode: rate that goes into HW descriptors
82 * @short_preamble: Mask for enabling short preamble in ratecode for CCK
83 * @dot11rate: value that goes into supported
84 * rates info element of MLME
85 * @ctrl_rate: Index of next lower basic rate, used for duration computation
86 * @max_4ms_framelen: maximum frame length(bytes) for tx duration
87 * @probe_interval: interval for rate control to probe for other rates
88 * @rssi_reduce_interval: interval for rate control to reduce rssi
89 * @initial_ratemax: initial ratemax value
91 struct ath_rate_table {
93 u8 rateCodeToIndex[256];
96 int valid_single_stream;
104 int8_t rssi_ack_validmin;
105 int8_t rssi_ack_deltamin;
110 u32 max_4ms_framelen;
113 } info[RATE_TABLE_SIZE];
115 u32 rssi_reduce_interval;
119 struct ath_tx_ratectrl_state {
120 int8_t rssi_thres; /* required rssi for this rate (dB) */
121 u8 per; /* recent estimate of packet error rate (%) */
126 u8 rs_rates[ATH_RATE_MAX];
130 * struct ath_rate_priv - Rate Control priv data
132 * @rssi_last: last ACK rssi
133 * @rssi_last_lookup: last ACK rssi used for lookup
134 * @rssi_last_prev: previous last ACK rssi
135 * @rssi_last_prev2: 2nd previous last ACK rssi
136 * @rssi_sum_cnt: count of rssi_sum for averaging
137 * @rssi_sum_rate: rate that we are averaging
138 * @rssi_sum: running sum of rssi for averaging
139 * @probe_rate: rate we are probing at
140 * @rssi_time: msec timestamp for last ack rssi
141 * @rssi_down_time: msec timestamp for last down step
142 * @probe_time: msec timestamp for last probe
143 * @hw_maxretry_pktcnt: num of packets since we got HW max retry error
144 * @max_valid_rate: maximum number of valid rate
145 * @per_down_time: msec timestamp for last PER down step
146 * @valid_phy_ratecnt: valid rate count
147 * @rate_max_phy: phy index for the max rate
148 * @probe_interval: interval for ratectrl to probe for other rates
149 * @prev_data_rix: rate idx of last data frame
150 * @ht_cap: HT capabilities
151 * @single_stream: When TRUE, only single TX stream possible
152 * @neg_rates: Negotatied rates
153 * @neg_ht_rates: Negotiated HT rates
155 struct ath_rate_priv {
157 int8_t rssi_last_lookup;
158 int8_t rssi_last_prev;
159 int8_t rssi_last_prev2;
160 int32_t rssi_sum_cnt;
161 int32_t rssi_sum_rate;
165 u8 hw_maxretry_pktcnt;
167 u8 valid_rate_index[RATE_TABLE_SIZE];
170 u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
171 u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
180 u32 tx_triglevel_max;
181 struct ath_tx_ratectrl_state state[RATE_TABLE_SIZE];
182 struct ath_rateset neg_rates;
183 struct ath_rateset neg_ht_rates;
184 struct ath_rate_softc *asc;
187 struct ath_tx_info_priv {
188 struct ath_tx_status tx;
193 #define ATH_TX_INFO_PRIV(tx_info) \
194 ((struct ath_tx_info_priv *)((tx_info)->rate_driver_data[0]))
196 void ath_rate_attach(struct ath_softc *sc);
197 u8 ath_rate_findrateix(struct ath_softc *sc, u8 dot11_rate);
198 int ath_rate_control_register(void);
199 void ath_rate_control_unregister(void);