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linux/drivers/net/wireless/ath/ath9k/rc.c

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/*
* Copyright (c) 2004 Video54 Technologies, Inc.
* Copyright (c) 2004-2009 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.
*/
#include <linux/slab.h>
#include "ath9k.h"
static const struct ath_rate_table ar5416_11na_ratetable = {
42,
8, /* MCS start */
{
{ VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
5400, 0, 12, 0, 0, 0, 0, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
7800, 1, 18, 0, 1, 1, 1, 1 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
10000, 2, 24, 2, 2, 2, 2, 2 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
13900, 3, 36, 2, 3, 3, 3, 3 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
17300, 4, 48, 4, 4, 4, 4, 4 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
23000, 5, 72, 4, 5, 5, 5, 5 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
27400, 6, 96, 4, 6, 6, 6, 6 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
29300, 7, 108, 4, 7, 7, 7, 7 },
{ VALID_2040, VALID_2040, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
6400, 0, 0, 0, 8, 25, 8, 25 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
12700, 1, 1, 2, 9, 26, 9, 26 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
18800, 2, 2, 2, 10, 27, 10, 27 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
25000, 3, 3, 4, 11, 28, 11, 28 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
36700, 4, 4, 4, 12, 29, 12, 29 },
{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
48100, 5, 5, 4, 13, 30, 13, 30 },
{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
53500, 6, 6, 4, 14, 31, 14, 31 },
{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
59000, 7, 7, 4, 15, 32, 15, 33 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
12700, 8, 8, 3, 16, 34, 16, 34 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
24800, 9, 9, 2, 17, 35, 17, 35 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
36600, 10, 10, 2, 18, 36, 18, 36 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
48100, 11, 11, 4, 19, 37, 19, 37 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
69500, 12, 12, 4, 20, 38, 20, 38 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
89500, 13, 13, 4, 21, 39, 21, 39 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
98900, 14, 14, 4, 22, 40, 22, 40 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
108300, 15, 15, 4, 23, 41, 24, 42 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS_HGI, 144400, /* 144.4 Mb */
12000, 15, 15, 4, 23, 41, 24, 42 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
13200, 0, 0, 0, 8, 25, 25, 25 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
25900, 1, 1, 2, 9, 26, 26, 26 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
38600, 2, 2, 2, 10, 27, 27, 27 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
49800, 3, 3, 4, 11, 28, 28, 28 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
72200, 4, 4, 4, 12, 29, 29, 29 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
92900, 5, 5, 4, 13, 30, 30, 30 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
102700, 6, 6, 4, 14, 31, 31, 31 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
112000, 7, 7, 4, 15, 32, 33, 33 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
122000, 7, 7, 4, 15, 32, 33, 33 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
25800, 8, 8, 0, 16, 34, 34, 34 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
49800, 9, 9, 2, 17, 35, 35, 35 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
71900, 10, 10, 2, 18, 36, 36, 36 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
92500, 11, 11, 4, 19, 37, 37, 37 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
130300, 12, 12, 4, 20, 38, 38, 38 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
162800, 13, 13, 4, 21, 39, 39, 39 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
178200, 14, 14, 4, 22, 40, 40, 40 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
192100, 15, 15, 4, 23, 41, 42, 42 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
207000, 15, 15, 4, 23, 41, 42, 42 },
},
50, /* probe interval */
WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
};
/* 4ms frame limit not used for NG mode. The values filled
* for HT are the 64K max aggregate limit */
static const struct ath_rate_table ar5416_11ng_ratetable = {
46,
12, /* MCS start */
{
{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
900, 0, 2, 0, 0, 0, 0, 0 },
{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
1900, 1, 4, 1, 1, 1, 1, 1 },
{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
4900, 2, 11, 2, 2, 2, 2, 2 },
{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
8100, 3, 22, 3, 3, 3, 3, 3 },
{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
5400, 4, 12, 4, 4, 4, 4, 4 },
{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
7800, 5, 18, 4, 5, 5, 5, 5 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
10100, 6, 24, 6, 6, 6, 6, 6 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
14100, 7, 36, 6, 7, 7, 7, 7 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
17700, 8, 48, 8, 8, 8, 8, 8 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
23700, 9, 72, 8, 9, 9, 9, 9 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
27400, 10, 96, 8, 10, 10, 10, 10 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
30900, 11, 108, 8, 11, 11, 11, 11 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
6400, 0, 0, 4, 12, 29, 12, 29 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
12700, 1, 1, 6, 13, 30, 13, 30 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
18800, 2, 2, 6, 14, 31, 14, 31 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
25000, 3, 3, 8, 15, 32, 15, 32 },
{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
36700, 4, 4, 8, 16, 33, 16, 33 },
{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
48100, 5, 5, 8, 17, 34, 17, 34 },
{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
53500, 6, 6, 8, 18, 35, 18, 35 },
{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
59000, 7, 7, 8, 19, 36, 19, 37 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
12700, 8, 8, 4, 20, 38, 20, 38 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
24800, 9, 9, 6, 21, 39, 21, 39 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
36600, 10, 10, 6, 22, 40, 22, 40 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
48100, 11, 11, 8, 23, 41, 23, 41 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
69500, 12, 12, 8, 24, 42, 24, 42 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
89500, 13, 13, 8, 25, 43, 25, 43 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
98900, 14, 14, 8, 26, 44, 26, 44 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
108300, 15, 15, 8, 27, 45, 28, 46 },
{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS_HGI, 144400, /* 130 Mb */
120000, 15, 15, 8, 27, 45, 28, 46 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
13200, 0, 0, 8, 12, 29, 29, 29 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
25900, 1, 1, 8, 13, 30, 30, 30 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
38600, 2, 2, 8, 14, 31, 31, 31 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
49800, 3, 3, 8, 15, 32, 32, 32 },
{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
72200, 4, 4, 8, 16, 33, 33, 33 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
92900, 5, 5, 8, 17, 34, 34, 34 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
102700, 6, 6, 8, 18, 35, 35, 35 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
112000, 7, 7, 8, 19, 36, 37, 37 },
{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
122000, 7, 7, 8, 19, 36, 37, 37 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
25800, 8, 8, 8, 20, 38, 38, 38 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
49800, 9, 9, 8, 21, 39, 39, 39 },
{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
71900, 10, 10, 8, 22, 40, 40, 40 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
92500, 11, 11, 8, 23, 41, 41, 41 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
130300, 12, 12, 8, 24, 42, 42, 42 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
162800, 13, 13, 8, 25, 43, 43, 43 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
178200, 14, 14, 8, 26, 44, 44, 44 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
192100, 15, 15, 8, 27, 45, 46, 46 },
{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
207000, 15, 15, 8, 27, 45, 46, 46 },
},
50, /* probe interval */
WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
};
static const struct ath_rate_table ar5416_11a_ratetable = {
8,
0,
{
{ VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
5400, 0, 12, 0, 0, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
7800, 1, 18, 0, 1, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
10000, 2, 24, 2, 2, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
13900, 3, 36, 2, 3, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
17300, 4, 48, 4, 4, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
23000, 5, 72, 4, 5, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
27400, 6, 96, 4, 6, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
29300, 7, 108, 4, 7, 0 },
},
50, /* probe interval */
0, /* Phy rates allowed initially */
};
static const struct ath_rate_table ar5416_11g_ratetable = {
12,
0,
{
{ VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
900, 0, 2, 0, 0, 0 },
{ VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
1900, 1, 4, 1, 1, 0 },
{ VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
4900, 2, 11, 2, 2, 0 },
{ VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
8100, 3, 22, 3, 3, 0 },
{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
5400, 4, 12, 4, 4, 0 },
{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
7800, 5, 18, 4, 5, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
10000, 6, 24, 6, 6, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
13900, 7, 36, 6, 7, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
17300, 8, 48, 8, 8, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
23000, 9, 72, 8, 9, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
27400, 10, 96, 8, 10, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
29300, 11, 108, 8, 11, 0 },
},
50, /* probe interval */
0, /* Phy rates allowed initially */
};
static const struct ath_rate_table *hw_rate_table[ATH9K_MODE_MAX] = {
[ATH9K_MODE_11A] = &ar5416_11a_ratetable,
[ATH9K_MODE_11G] = &ar5416_11g_ratetable,
[ATH9K_MODE_11NA_HT20] = &ar5416_11na_ratetable,
[ATH9K_MODE_11NG_HT20] = &ar5416_11ng_ratetable,
[ATH9K_MODE_11NA_HT40PLUS] = &ar5416_11na_ratetable,
[ATH9K_MODE_11NA_HT40MINUS] = &ar5416_11na_ratetable,
[ATH9K_MODE_11NG_HT40PLUS] = &ar5416_11ng_ratetable,
[ATH9K_MODE_11NG_HT40MINUS] = &ar5416_11ng_ratetable,
};
static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
struct ieee80211_tx_rate *rate);
static inline int8_t median(int8_t a, int8_t b, int8_t c)
{
if (a >= b) {
if (b >= c)
return b;
else if (a > c)
return c;
else
return a;
} else {
if (a >= c)
return a;
else if (b >= c)
return c;
else
return b;
}
}
static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
struct ath_rate_priv *ath_rc_priv)
{
u8 i, j, idx, idx_next;
for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
for (j = 0; j <= i-1; j++) {
idx = ath_rc_priv->valid_rate_index[j];
idx_next = ath_rc_priv->valid_rate_index[j+1];
if (rate_table->info[idx].ratekbps >
rate_table->info[idx_next].ratekbps) {
ath_rc_priv->valid_rate_index[j] = idx_next;
ath_rc_priv->valid_rate_index[j+1] = idx;
}
}
}
}
static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
{
u8 i;
for (i = 0; i < ath_rc_priv->rate_table_size; i++)
ath_rc_priv->valid_rate_index[i] = 0;
}
static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
u8 index, int valid_tx_rate)
{
BUG_ON(index > ath_rc_priv->rate_table_size);
ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
}
static inline
int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
struct ath_rate_priv *ath_rc_priv,
u8 cur_valid_txrate,
u8 *next_idx)
{
u8 i;
for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
*next_idx = ath_rc_priv->valid_rate_index[i+1];
return 1;
}
}
/* No more valid rates */
*next_idx = 0;
return 0;
}
/* Return true only for single stream */
static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
{
if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
return 0;
if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
return 0;
if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
return 0;
if (!ignore_cw && WLAN_RC_PHY_HT(phy))
if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
return 0;
return 1;
}
static inline int
ath_rc_get_lower_rix(const struct ath_rate_table *rate_table,
struct ath_rate_priv *ath_rc_priv,
u8 cur_valid_txrate, u8 *next_idx)
{
int8_t i;
for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
*next_idx = ath_rc_priv->valid_rate_index[i-1];
return 1;
}
}
return 0;
}
static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
const struct ath_rate_table *rate_table,
u32 capflag)
{
u8 i, hi = 0;
u32 valid;
for (i = 0; i < rate_table->rate_cnt; i++) {
valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
rate_table->info[i].valid_single_stream :
rate_table->info[i].valid);
if (valid == 1) {
u32 phy = rate_table->info[i].phy;
u8 valid_rate_count = 0;
if (!ath_rc_valid_phyrate(phy, capflag, 0))
continue;
valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
ath_rc_priv->valid_phy_ratecnt[phy] += 1;
ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
hi = A_MAX(hi, i);
}
}
return hi;
}
static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
const struct ath_rate_table *rate_table,
struct ath_rateset *rateset,
u32 capflag)
{
u8 i, j, hi = 0;
/* Use intersection of working rates and valid rates */
for (i = 0; i < rateset->rs_nrates; i++) {
for (j = 0; j < rate_table->rate_cnt; j++) {
u32 phy = rate_table->info[j].phy;
u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
rate_table->info[j].valid_single_stream :
rate_table->info[j].valid);
u8 rate = rateset->rs_rates[i];
u8 dot11rate = rate_table->info[j].dot11rate;
/* We allow a rate only if its valid and the
* capflag matches one of the validity
* (VALID/VALID_20/VALID_40) flags */
if ((rate == dot11rate) &&
((valid & WLAN_RC_CAP_MODE(capflag)) ==
WLAN_RC_CAP_MODE(capflag)) &&
!WLAN_RC_PHY_HT(phy)) {
u8 valid_rate_count = 0;
if (!ath_rc_valid_phyrate(phy, capflag, 0))
continue;
valid_rate_count =
ath_rc_priv->valid_phy_ratecnt[phy];
ath_rc_priv->valid_phy_rateidx[phy]
[valid_rate_count] = j;
ath_rc_priv->valid_phy_ratecnt[phy] += 1;
ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
hi = A_MAX(hi, j);
}
}
}
return hi;
}
static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
const struct ath_rate_table *rate_table,
u8 *mcs_set, u32 capflag)
{
struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;
u8 i, j, hi = 0;
/* Use intersection of working rates and valid rates */
for (i = 0; i < rateset->rs_nrates; i++) {
for (j = 0; j < rate_table->rate_cnt; j++) {
u32 phy = rate_table->info[j].phy;
u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
rate_table->info[j].valid_single_stream :
rate_table->info[j].valid);
u8 rate = rateset->rs_rates[i];
u8 dot11rate = rate_table->info[j].dot11rate;
if ((rate != dot11rate) || !WLAN_RC_PHY_HT(phy) ||
!WLAN_RC_PHY_HT_VALID(valid, capflag))
continue;
if (!ath_rc_valid_phyrate(phy, capflag, 0))
continue;
ath_rc_priv->valid_phy_rateidx[phy]
[ath_rc_priv->valid_phy_ratecnt[phy]] = j;
ath_rc_priv->valid_phy_ratecnt[phy] += 1;
ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
hi = A_MAX(hi, j);
}
}
return hi;
}
/* Finds the highest rate index we can use */
static u8 ath_rc_get_highest_rix(struct ath_softc *sc,
struct ath_rate_priv *ath_rc_priv,
const struct ath_rate_table *rate_table,
int *is_probing)
{
u32 best_thruput, this_thruput, now_msec;
u8 rate, next_rate, best_rate, maxindex, minindex;
int8_t index = 0;
now_msec = jiffies_to_msecs(jiffies);
*is_probing = 0;
best_thruput = 0;
maxindex = ath_rc_priv->max_valid_rate-1;
minindex = 0;
best_rate = minindex;
/*
* Try the higher rate first. It will reduce memory moving time
* if we have very good channel characteristics.
*/
for (index = maxindex; index >= minindex ; index--) {
u8 per_thres;
rate = ath_rc_priv->valid_rate_index[index];
if (rate > ath_rc_priv->rate_max_phy)
continue;
/*
* For TCP the average collision rate is around 11%,
* so we ignore PERs less than this. This is to
* prevent the rate we are currently using (whose
* PER might be in the 10-15 range because of TCP
* collisions) looking worse than the next lower
* rate whose PER has decayed close to 0. If we
* used to next lower rate, its PER would grow to
* 10-15 and we would be worse off then staying
* at the current rate.
*/
per_thres = ath_rc_priv->per[rate];
if (per_thres < 12)
per_thres = 12;
this_thruput = rate_table->info[rate].user_ratekbps *
(100 - per_thres);
if (best_thruput <= this_thruput) {
best_thruput = this_thruput;
best_rate = rate;
}
}
rate = best_rate;
/*
* Must check the actual rate (ratekbps) to account for
* non-monoticity of 11g's rate table
*/
if (rate >= ath_rc_priv->rate_max_phy) {
rate = ath_rc_priv->rate_max_phy;
/* Probe the next allowed phy state */
if (ath_rc_get_nextvalid_txrate(rate_table,
ath_rc_priv, rate, &next_rate) &&
(now_msec - ath_rc_priv->probe_time >
rate_table->probe_interval) &&
(ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
rate = next_rate;
ath_rc_priv->probe_rate = rate;
ath_rc_priv->probe_time = now_msec;
ath_rc_priv->hw_maxretry_pktcnt = 0;
*is_probing = 1;
}
}
if (rate > (ath_rc_priv->rate_table_size - 1))
rate = ath_rc_priv->rate_table_size - 1;
if (rate_table->info[rate].valid &&
(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
return rate;
if (rate_table->info[rate].valid_single_stream &&
!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
return rate;
/* This should not happen */
WARN_ON(1);
rate = ath_rc_priv->valid_rate_index[0];
return rate;
}
static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
struct ieee80211_tx_rate *rate,
struct ieee80211_tx_rate_control *txrc,
u8 tries, u8 rix, int rtsctsenable)
{
rate->count = tries;
rate->idx = rate_table->info[rix].ratecode;
if (txrc->short_preamble)
rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
if (txrc->rts || rtsctsenable)
rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
if (WLAN_RC_PHY_HT(rate_table->info[rix].phy)) {
rate->flags |= IEEE80211_TX_RC_MCS;
if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
rate->flags |= IEEE80211_TX_RC_SHORT_GI;
}
}
static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
const struct ath_rate_table *rate_table,
struct ieee80211_tx_info *tx_info)
{
struct ieee80211_tx_rate *rates = tx_info->control.rates;
int i = 0, rix = 0, cix, enable_g_protection = 0;
/* get the cix for the lowest valid rix */
for (i = 3; i >= 0; i--) {
if (rates[i].count && (rates[i].idx >= 0)) {
rix = ath_rc_get_rateindex(rate_table, &rates[i]);
break;
}
}
cix = rate_table->info[rix].ctrl_rate;
/* All protection frames are transmited at 2Mb/s for 802.11g,
* otherwise we transmit them at 1Mb/s */
if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
!conf_is_ht(&sc->hw->conf))
enable_g_protection = 1;
/*
* If 802.11g protection is enabled, determine whether to use RTS/CTS or
* just CTS. Note that this is only done for OFDM/HT unicast frames.
*/
if ((sc->sc_flags & SC_OP_PROTECT_ENABLE) &&
(rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
cix = rate_table->info[enable_g_protection].ctrl_rate;
}
tx_info->control.rts_cts_rate_idx = cix;
}
static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
struct ieee80211_tx_rate_control *txrc)
{
struct ath_softc *sc = priv;
struct ath_rate_priv *ath_rc_priv = priv_sta;
const struct ath_rate_table *rate_table;
struct sk_buff *skb = txrc->skb;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_tx_rate *rates = tx_info->control.rates;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
__le16 fc = hdr->frame_control;
u8 try_per_rate, i = 0, rix;
int is_probe = 0;
if (rate_control_send_low(sta, priv_sta, txrc))
return;
/*
* For Multi Rate Retry we use a different number of
* retry attempt counts. This ends up looking like this:
*
* MRR[0] = 4
* MRR[1] = 4
* MRR[2] = 4
* MRR[3] = 8
*
*/
try_per_rate = 4;
rate_table = sc->cur_rate_table;
rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
/*
* If we're in HT mode and both us and our peer supports LDPC.
* We don't need to check our own device's capabilities as our own
* ht capabilities would have already been intersected with our peer's.
*/
if (conf_is_ht(&sc->hw->conf) &&
(sta->ht_cap.cap & IEEE80211_HT_CAP_LDPC_CODING))
tx_info->flags |= IEEE80211_TX_CTL_LDPC;
if (conf_is_ht(&sc->hw->conf) &&
(sta->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
tx_info->flags |= (1 << IEEE80211_TX_CTL_STBC_SHIFT);
if (is_probe) {
/* set one try for probe rates. For the
* probes don't enable rts */
ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
1, rix, 0);
/* Get the next tried/allowed rate. No RTS for the next series
* after the probe rate
*/
ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
try_per_rate, rix, 0);
tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
} else {
/* Set the choosen rate. No RTS for first series entry. */
ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
try_per_rate, rix, 0);
}
/* Fill in the other rates for multirate retry */
for ( ; i < 4; i++) {
/* Use twice the number of tries for the last MRR segment. */
if (i + 1 == 4)
try_per_rate = 8;
ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
/* All other rates in the series have RTS enabled */
ath_rc_rate_set_series(rate_table, &rates[i], txrc,
try_per_rate, rix, 1);
}
/*
* NB:Change rate series to enable aggregation when operating
* at lower MCS rates. When first rate in series is MCS2
* in HT40 @ 2.4GHz, series should look like:
*
* {MCS2, MCS1, MCS0, MCS0}.
*
* When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
* look like:
*
* {MCS3, MCS2, MCS1, MCS1}
*
* So, set fourth rate in series to be same as third one for
* above conditions.
*/
if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
(conf_is_ht(&sc->hw->conf))) {
u8 dot11rate = rate_table->info[rix].dot11rate;
u8 phy = rate_table->info[rix].phy;
if (i == 4 &&
((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
(dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
rates[3].idx = rates[2].idx;
rates[3].flags = rates[2].flags;
}
}
/*
* Force hardware to use computed duration for next
* fragment by disabling multi-rate retry, which
* updates duration based on the multi-rate duration table.
*
* FIXME: Fix duration
*/
if (ieee80211_has_morefrags(fc) ||
(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
rates[1].count = rates[2].count = rates[3].count = 0;
rates[1].idx = rates[2].idx = rates[3].idx = 0;
rates[0].count = ATH_TXMAXTRY;
}
/* Setup RTS/CTS */
ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
}
static bool ath_rc_update_per(struct ath_softc *sc,
const struct ath_rate_table *rate_table,
struct ath_rate_priv *ath_rc_priv,
struct ieee80211_tx_info *tx_info,
int tx_rate, int xretries, int retries,
u32 now_msec)
{
bool state_change = false;
int count, n_bad_frames;
u8 last_per;
static u32 nretry_to_per_lookup[10] = {
100 * 0 / 1,
100 * 1 / 4,
100 * 1 / 2,
100 * 3 / 4,
100 * 4 / 5,
100 * 5 / 6,
100 * 6 / 7,
100 * 7 / 8,
100 * 8 / 9,
100 * 9 / 10
};
last_per = ath_rc_priv->per[tx_rate];
n_bad_frames = tx_info->status.ampdu_len - tx_info->status.ampdu_ack_len;
if (xretries) {
if (xretries == 1) {
ath_rc_priv->per[tx_rate] += 30;
if (ath_rc_priv->per[tx_rate] > 100)
ath_rc_priv->per[tx_rate] = 100;
} else {
/* xretries == 2 */
count = ARRAY_SIZE(nretry_to_per_lookup);
if (retries >= count)
retries = count - 1;
/* new_PER = 7/8*old_PER + 1/8*(currentPER) */
ath_rc_priv->per[tx_rate] =
(u8)(last_per - (last_per >> 3) + (100 >> 3));
}
/* xretries == 1 or 2 */
if (ath_rc_priv->probe_rate == tx_rate)
ath_rc_priv->probe_rate = 0;
} else { /* xretries == 0 */
count = ARRAY_SIZE(nretry_to_per_lookup);
if (retries >= count)
retries = count - 1;
if (n_bad_frames) {
/* new_PER = 7/8*old_PER + 1/8*(currentPER)
* Assuming that n_frames is not 0. The current PER
* from the retries is 100 * retries / (retries+1),
* since the first retries attempts failed, and the
* next one worked. For the one that worked,
* n_bad_frames subframes out of n_frames wored,
* so the PER for that part is
* 100 * n_bad_frames / n_frames, and it contributes
* 100 * n_bad_frames / (n_frames * (retries+1)) to
* the above PER. The expression below is a
* simplified version of the sum of these two terms.
*/
if (tx_info->status.ampdu_len > 0) {
int n_frames, n_bad_tries;
u8 cur_per, new_per;
n_bad_tries = retries * tx_info->status.ampdu_len +
n_bad_frames;
n_frames = tx_info->status.ampdu_len * (retries + 1);
cur_per = (100 * n_bad_tries / n_frames) >> 3;
new_per = (u8)(last_per - (last_per >> 3) + cur_per);
ath_rc_priv->per[tx_rate] = new_per;
}
} else {
ath_rc_priv->per[tx_rate] =
(u8)(last_per - (last_per >> 3) +
(nretry_to_per_lookup[retries] >> 3));
}
/*
* If we got at most one retry then increase the max rate if
* this was a probe. Otherwise, ignore the probe.
*/
if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
if (retries > 0 || 2 * n_bad_frames > tx_info->status.ampdu_len) {
/*
* Since we probed with just a single attempt,
* any retries means the probe failed. Also,
* if the attempt worked, but more than half
* the subframes were bad then also consider
* the probe a failure.
*/
ath_rc_priv->probe_rate = 0;
} else {
u8 probe_rate = 0;
ath_rc_priv->rate_max_phy =
ath_rc_priv->probe_rate;
probe_rate = ath_rc_priv->probe_rate;
if (ath_rc_priv->per[probe_rate] > 30)
ath_rc_priv->per[probe_rate] = 20;
ath_rc_priv->probe_rate = 0;
/*
* Since this probe succeeded, we allow the next
* probe twice as soon. This allows the maxRate
* to move up faster if the probes are
* successful.
*/
ath_rc_priv->probe_time =
now_msec - rate_table->probe_interval / 2;
}
}
if (retries > 0) {
/*
* Don't update anything. We don't know if
* this was because of collisions or poor signal.
*/
ath_rc_priv->hw_maxretry_pktcnt = 0;
} else {
/*
* It worked with no retries. First ignore bogus (small)
* rssi_ack values.
*/
if (tx_rate == ath_rc_priv->rate_max_phy &&
ath_rc_priv->hw_maxretry_pktcnt < 255) {
ath_rc_priv->hw_maxretry_pktcnt++;
}
}
}
return state_change;
}
/* Update PER, RSSI and whatever else that the code thinks it is doing.
If you can make sense of all this, you really need to go out more. */
static void ath_rc_update_ht(struct ath_softc *sc,
struct ath_rate_priv *ath_rc_priv,
struct ieee80211_tx_info *tx_info,
int tx_rate, int xretries, int retries)
{
u32 now_msec = jiffies_to_msecs(jiffies);
int rate;
u8 last_per;
bool state_change = false;
const struct ath_rate_table *rate_table = sc->cur_rate_table;
int size = ath_rc_priv->rate_table_size;
if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
return;
last_per = ath_rc_priv->per[tx_rate];
/* Update PER first */
state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
tx_info, tx_rate, xretries,
retries, now_msec);
/*
* If this rate looks bad (high PER) then stop using it for
* a while (except if we are probing).
*/
if (ath_rc_priv->per[tx_rate] >= 55 && tx_rate > 0 &&
rate_table->info[tx_rate].ratekbps <=
rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
ath_rc_get_lower_rix(rate_table, ath_rc_priv,
(u8)tx_rate, &ath_rc_priv->rate_max_phy);
/* Don't probe for a little while. */
ath_rc_priv->probe_time = now_msec;
}
/* Make sure the rates below this have lower PER */
/* Monotonicity is kept only for rates below the current rate. */
if (ath_rc_priv->per[tx_rate] < last_per) {
for (rate = tx_rate - 1; rate >= 0; rate--) {
if (ath_rc_priv->per[rate] >
ath_rc_priv->per[rate+1]) {
ath_rc_priv->per[rate] =
ath_rc_priv->per[rate+1];
}
}
}
/* Maintain monotonicity for rates above the current rate */
for (rate = tx_rate; rate < size - 1; rate++) {
if (ath_rc_priv->per[rate+1] <
ath_rc_priv->per[rate])
ath_rc_priv->per[rate+1] =
ath_rc_priv->per[rate];
}
/* Every so often, we reduce the thresholds
* and PER (different for CCK and OFDM). */
if (now_msec - ath_rc_priv->per_down_time >=
rate_table->probe_interval) {
for (rate = 0; rate < size; rate++) {
ath_rc_priv->per[rate] =
7 * ath_rc_priv->per[rate] / 8;
}
ath_rc_priv->per_down_time = now_msec;
}
ath_debug_stat_retries(sc, tx_rate, xretries, retries,
ath_rc_priv->per[tx_rate]);
}
static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
struct ieee80211_tx_rate *rate)
{
int rix;
if (!(rate->flags & IEEE80211_TX_RC_MCS))
return rate->idx;
rix = rate->idx + rate_table->mcs_start;
if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
(rate->flags & IEEE80211_TX_RC_SHORT_GI))
rix = rate_table->info[rix].ht_index;
else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
rix = rate_table->info[rix].sgi_index;
else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
rix = rate_table->info[rix].cw40index;
else
rix = rate_table->info[rix].base_index;
return rix;
}
static void ath_rc_tx_status(struct ath_softc *sc,
struct ath_rate_priv *ath_rc_priv,
struct ieee80211_tx_info *tx_info,
int final_ts_idx, int xretries, int long_retry)
{
const struct ath_rate_table *rate_table;
struct ieee80211_tx_rate *rates = tx_info->status.rates;
u8 flags;
u32 i = 0, rix;
rate_table = sc->cur_rate_table;
/*
* If the first rate is not the final index, there
* are intermediate rate failures to be processed.
*/
if (final_ts_idx != 0) {
/* Process intermediate rates that failed.*/
for (i = 0; i < final_ts_idx ; i++) {
if (rates[i].count != 0 && (rates[i].idx >= 0)) {
flags = rates[i].flags;
/* If HT40 and we have switched mode from
* 40 to 20 => don't update */
if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
!(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
return;
rix = ath_rc_get_rateindex(rate_table, &rates[i]);
ath_rc_update_ht(sc, ath_rc_priv, tx_info,
rix, xretries ? 1 : 2,
rates[i].count);
}
}
} else {
/*
* Handle the special case of MIMO PS burst, where the second
* aggregate is sent out with only one rate and one try.
* Treating it as an excessive retry penalizes the rate
* inordinately.
*/
if (rates[0].count == 1 && xretries == 1)
xretries = 2;
}
flags = rates[i].flags;
/* If HT40 and we have switched mode from 40 to 20 => don't update */
if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
!(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
return;
rix = ath_rc_get_rateindex(rate_table, &rates[i]);
ath_rc_update_ht(sc, ath_rc_priv, tx_info, rix, xretries, long_retry);
}
static const
struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
enum ieee80211_band band,
bool is_ht,
bool is_cw_40)
{
int mode = 0;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
switch(band) {
case IEEE80211_BAND_2GHZ:
mode = ATH9K_MODE_11G;
if (is_ht)
mode = ATH9K_MODE_11NG_HT20;
if (is_cw_40)
mode = ATH9K_MODE_11NG_HT40PLUS;
break;
case IEEE80211_BAND_5GHZ:
mode = ATH9K_MODE_11A;
if (is_ht)
mode = ATH9K_MODE_11NA_HT20;
if (is_cw_40)
mode = ATH9K_MODE_11NA_HT40PLUS;
break;
default:
ath_print(common, ATH_DBG_CONFIG, "Invalid band\n");
return NULL;
}
BUG_ON(mode >= ATH9K_MODE_MAX);
ath_print(common, ATH_DBG_CONFIG,
"Choosing rate table for mode: %d\n", mode);
sc->cur_rate_mode = mode;
return hw_rate_table[mode];
}
static void ath_rc_init(struct ath_softc *sc,
struct ath_rate_priv *ath_rc_priv,
struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta,
const struct ath_rate_table *rate_table)
{
struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
u8 *ht_mcs = (u8 *)&ath_rc_priv->neg_ht_rates;
u8 i, j, k, hi = 0, hthi = 0;
/* Initial rate table size. Will change depending
* on the working rate set */
ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;
/* Initialize thresholds according to the global rate table */
for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
ath_rc_priv->per[i] = 0;
}
/* Determine the valid rates */
ath_rc_init_valid_txmask(ath_rc_priv);
for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
for (j = 0; j < MAX_TX_RATE_PHY; j++)
ath_rc_priv->valid_phy_rateidx[i][j] = 0;
ath_rc_priv->valid_phy_ratecnt[i] = 0;
}
if (!rateset->rs_nrates) {
/* No working rate, just initialize valid rates */
hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
ath_rc_priv->ht_cap);
} else {
/* Use intersection of working rates and valid rates */
hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
rateset, ath_rc_priv->ht_cap);
if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
hthi = ath_rc_setvalid_htrates(ath_rc_priv,
rate_table,
ht_mcs,
ath_rc_priv->ht_cap);
}
hi = A_MAX(hi, hthi);
}
ath_rc_priv->rate_table_size = hi + 1;
ath_rc_priv->rate_max_phy = 0;
BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
ath_rc_priv->valid_rate_index[k++] =
ath_rc_priv->valid_phy_rateidx[i][j];
}
if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1)
|| !ath_rc_priv->valid_phy_ratecnt[i])
continue;
ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
}
BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
BUG_ON(k > RATE_TABLE_SIZE);
ath_rc_priv->max_valid_rate = k;
ath_rc_sort_validrates(rate_table, ath_rc_priv);
ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
sc->cur_rate_table = rate_table;
ath_print(common, ATH_DBG_CONFIG,
"RC Initialized with capabilities: 0x%x\n",
ath_rc_priv->ht_cap);
}
static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
bool is_cw40, bool is_sgi)
{
u8 caps = 0;
if (sta->ht_cap.ht_supported) {
caps = WLAN_RC_HT_FLAG;
if (sc->sc_ah->caps.tx_chainmask != 1 &&
ath9k_hw_getcapability(sc->sc_ah, ATH9K_CAP_DS, 0, NULL)) {
if (sta->ht_cap.mcs.rx_mask[1])
caps |= WLAN_RC_DS_FLAG;
}
if (is_cw40)
caps |= WLAN_RC_40_FLAG;
if (is_sgi)
caps |= WLAN_RC_SGI_FLAG;
}
return caps;
}
/***********************************/
/* mac80211 Rate Control callbacks */
/***********************************/
static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta,
struct sk_buff *skb)
{
struct ath_softc *sc = priv;
struct ath_rate_priv *ath_rc_priv = priv_sta;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr;
int final_ts_idx = 0, tx_status = 0, is_underrun = 0;
int long_retry = 0;
__le16 fc;
int i;
hdr = (struct ieee80211_hdr *)skb->data;
fc = hdr->frame_control;
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
if (!rate->count)
break;
final_ts_idx = i;
long_retry = rate->count - 1;
}
if (!priv_sta || !ieee80211_is_data(fc))
return;
/* This packet was aggregated but doesn't carry status info */
if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) &&
!(tx_info->flags & IEEE80211_TX_STAT_AMPDU))
return;
if (tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED)
return;
/*
* If an underrun error is seen assume it as an excessive retry only
* if max frame trigger level has been reached (2 KB for singel stream,
* and 4 KB for dual stream). Adjust the long retry as if the frame was
* tried hw->max_rate_tries times to affect how ratectrl updates PER for
* the failed rate. In case of congestion on the bus penalizing these
* type of underruns should help hardware actually transmit new frames
* successfully by eventually preferring slower rates. This itself
* should also alleviate congestion on the bus.
*/
if ((tx_info->pad[0] & ATH_TX_INFO_UNDERRUN) &&
(sc->sc_ah->tx_trig_level >= ath_rc_priv->tx_triglevel_max)) {
tx_status = 1;
is_underrun = 1;
}
if (tx_info->pad[0] & ATH_TX_INFO_XRETRY)
tx_status = 1;
ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
(is_underrun) ? sc->hw->max_rate_tries : long_retry);
/* Check if aggregation has to be enabled for this tid */
if (conf_is_ht(&sc->hw->conf) &&
!(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
if (ieee80211_is_data_qos(fc)) {
u8 *qc, tid;
struct ath_node *an;
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & 0xf;
an = (struct ath_node *)sta->drv_priv;
if(ath_tx_aggr_check(sc, an, tid))
ieee80211_start_tx_ba_session(sta, tid);
}
}
ath_debug_stat_rc(sc, ath_rc_get_rateindex(sc->cur_rate_table,
&tx_info->status.rates[final_ts_idx]));
}
static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta)
{
struct ath_softc *sc = priv;
struct ath_rate_priv *ath_rc_priv = priv_sta;
const struct ath_rate_table *rate_table;
bool is_cw40, is_sgi = false;
int i, j = 0;
for (i = 0; i < sband->n_bitrates; i++) {
if (sta->supp_rates[sband->band] & BIT(i)) {
ath_rc_priv->neg_rates.rs_rates[j]
= (sband->bitrates[i].bitrate * 2) / 10;
j++;
}
}
ath_rc_priv->neg_rates.rs_nrates = j;
if (sta->ht_cap.ht_supported) {
for (i = 0, j = 0; i < 77; i++) {
if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
if (j == ATH_RATE_MAX)
break;
}
ath_rc_priv->neg_ht_rates.rs_nrates = j;
}
is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
if (is_cw40)
is_sgi = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
else if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
is_sgi = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
/* Choose rate table first */
if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
(sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
(sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
rate_table = ath_choose_rate_table(sc, sband->band,
sta->ht_cap.ht_supported, is_cw40);
} else {
rate_table = hw_rate_table[sc->cur_rate_mode];
}
ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi);
ath_rc_init(sc, priv_sta, sband, sta, rate_table);
}
static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta,
u32 changed, enum nl80211_channel_type oper_chan_type)
{
struct ath_softc *sc = priv;
struct ath_rate_priv *ath_rc_priv = priv_sta;
const struct ath_rate_table *rate_table = NULL;
bool oper_cw40 = false, oper_sgi;
bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
true : false;
bool local_sgi = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
true : false;
/* FIXME: Handle AP mode later when we support CWM */
if (changed & IEEE80211_RC_HT_CHANGED) {
if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
return;
if (oper_chan_type == NL80211_CHAN_HT40MINUS ||
oper_chan_type == NL80211_CHAN_HT40PLUS)
oper_cw40 = true;
if (oper_cw40)
oper_sgi = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
true : false;
else if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
oper_sgi = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20) ?
true : false;
else
oper_sgi = false;
if ((local_cw40 != oper_cw40) || (local_sgi != oper_sgi)) {
rate_table = ath_choose_rate_table(sc, sband->band,
sta->ht_cap.ht_supported,
oper_cw40);
ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
oper_cw40, oper_sgi);
ath_rc_init(sc, priv_sta, sband, sta, rate_table);
ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
"Operating HT Bandwidth changed to: %d\n",
sc->hw->conf.channel_type);
sc->cur_rate_table = hw_rate_table[sc->cur_rate_mode];
}
}
}
static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
{
struct ath_wiphy *aphy = hw->priv;
return aphy->sc;
}
static void ath_rate_free(void *priv)
{
return;
}
static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
{
struct ath_softc *sc = priv;
struct ath_rate_priv *rate_priv;
rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
if (!rate_priv) {
ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
"Unable to allocate private rc structure\n");
return NULL;
}
rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
return rate_priv;
}
static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
void *priv_sta)
{
struct ath_rate_priv *rate_priv = priv_sta;
kfree(rate_priv);
}
static struct rate_control_ops ath_rate_ops = {
.module = NULL,
.name = "ath9k_rate_control",
.tx_status = ath_tx_status,
.get_rate = ath_get_rate,
.rate_init = ath_rate_init,
.rate_update = ath_rate_update,
.alloc = ath_rate_alloc,
.free = ath_rate_free,
.alloc_sta = ath_rate_alloc_sta,
.free_sta = ath_rate_free_sta,
};
int ath_rate_control_register(void)
{
return ieee80211_rate_control_register(&ath_rate_ops);
}
void ath_rate_control_unregister(void)
{
ieee80211_rate_control_unregister(&ath_rate_ops);
}
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