/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 2004 Video54 Technologies, Inc.
 * Copyright (c) 2004-2008 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.
 */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/ddi.h>
#include <sys/net80211_ht.h>

#include "arn_core.h"
#include "arn_hw.h"
#include "arn_reg.h"

static struct ath_rate_table ar5416_11na_ratetable = {
        42,
        {0},
        {
                { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
                        5400, 0x0b, 0x00, 12,
                        0, 2, 1, 0, 0, 0, 0, 0 },
                { VALID,        VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
                        7800,  0x0f, 0x00, 18,
                        0, 3, 1, 1, 1, 1, 1, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
                        10000, 0x0a, 0x00, 24,
                        2, 4, 2, 2, 2, 2, 2, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
                        13900, 0x0e, 0x00, 36,
                        2, 6,  2, 3, 3, 3, 3, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
                        17300, 0x09, 0x00, 48,
                        4, 10, 3, 4, 4, 4, 4, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
                        23000, 0x0d, 0x00, 72,
                        4, 14, 3, 5, 5, 5, 5, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
                        27400, 0x08, 0x00, 96,
                        4, 20, 3, 6, 6, 6, 6, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
                        29300, 0x0c, 0x00, 108,
                        4, 23, 3, 7, 7, 7, 7, 0 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
                        6400, 0x80, 0x00, 0,
                        0, 2, 3, 8, 24, 8, 24, 3216 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
                        12700, 0x81, 0x00, 1,
                        2, 4, 3, 9, 25, 9, 25, 6434 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
                        18800, 0x82, 0x00, 2,
                        2, 6, 3, 10, 26, 10, 26, 9650 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
                        25000, 0x83, 0x00, 3,
                        4, 10, 3, 11, 27, 11, 27, 12868 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
                        36700, 0x84, 0x00, 4,
                        4, 14, 3, 12, 28, 12, 28, 19304 },
                { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
                        48100, 0x85, 0x00, 5,
                        4, 20, 3, 13, 29, 13, 29, 25740 },
                { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
                        53500, 0x86, 0x00, 6,
                        4, 23, 3, 14, 30, 14, 30,  28956 },
                { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
                        59000, 0x87, 0x00, 7,
                        4, 25, 3, 15, 31, 15, 32, 32180 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
                        12700, 0x88, 0x00,
                        8, 0, 2, 3, 16, 33, 16, 33, 6430 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
                        24800, 0x89, 0x00, 9,
                        2, 4, 3, 17, 34, 17, 34, 12860 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
                        36600, 0x8a, 0x00, 10,
                        2, 6, 3, 18, 35, 18, 35, 19300 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
                        48100, 0x8b, 0x00, 11,
                        4, 10, 3, 19, 36, 19, 36, 25736 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
                        69500, 0x8c, 0x00, 12,
                        4, 14, 3, 20, 37, 20, 37, 38600 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
                        89500, 0x8d, 0x00, 13,
                        4, 20, 3, 21, 38, 21, 38, 51472 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
                        98900, 0x8e, 0x00, 14,
                        4, 23, 3, 22, 39, 22, 39, 57890 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
                        108300, 0x8f, 0x00, 15,
                        4, 25, 3, 23, 40, 23, 41, 64320 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
                        13200, 0x80, 0x00, 0,
                        0, 2, 3, 8, 24, 24, 24, 6684 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
                        25900, 0x81, 0x00, 1,
                        2, 4, 3, 9, 25, 25, 25, 13368 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
                        38600, 0x82, 0x00, 2,
                        2, 6, 3, 10, 26, 26, 26, 20052 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
                        49800, 0x83, 0x00, 3,
                        4, 10, 3, 11, 27, 27, 27, 26738 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
                        72200, 0x84, 0x00, 4,
                        4, 14, 3, 12, 28, 28, 28, 40104 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
                        92900, 0x85, 0x00, 5,
                        4, 20, 3, 13, 29, 29, 29, 53476 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5Mb */
                        102700, 0x86, 0x00, 6,
                        4, 23, 3, 14, 30, 30, 30, 60156 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
                        112000, 0x87, 0x00, 7,
                        4, 25, 3, 15, 31, 32, 32, 66840 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI,
                        150000, /* 150Mb */
                        122000, 0x87, 0x00, 7,
                        4, 25, 3, 15, 31, 32, 32, 74200 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
                        25800, 0x88, 0x00, 8,
                        0, 2, 3, 16, 33, 33, 33, 13360 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
                        49800, 0x89, 0x00, 9,
                        2, 4, 3, 17, 34, 34, 34, 26720 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
                        71900, 0x8a, 0x00, 10,
                        2, 6, 3, 18, 35, 35, 35, 40080 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
                        92500, 0x8b, 0x00, 11,
                        4, 10, 3, 19, 36, 36, 36, 53440 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
                        130300, 0x8c, 0x00, 12,
                        4, 14, 3, 20, 37, 37, 37, 80160 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
                        162800, 0x8d, 0x00, 13,
                        4, 20, 3, 21, 38, 38, 38, 106880 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
                        178200, 0x8e, 0x00, 14,
                        4, 23, 3, 22, 39, 39, 39, 120240 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
                        192100, 0x8f, 0x00, 15,
                        4, 25, 3, 23, 40, 41, 41, 133600 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI,
                        300000, /* 300 Mb */
                        207000, 0x8f, 0x00, 15,
                        4, 25, 3, 23, 40, 41, 41, 148400 },
        },
        50,  /* probe interval */
        50,  /* rssi reduce 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 struct ath_rate_table ar5416_11ng_ratetable = {
        46,
        {0},
        {
                { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
                        900, 0x1b, 0x00, 2,
                        0, 0, 1, 0, 0, 0, 0, 0 },
                { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
                        1900, 0x1a, 0x04, 4,
                        1, 1, 1, 1, 1, 1, 1, 0 },
                { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
                        4900, 0x19, 0x04, 11,
                        2, 2, 2, 2, 2, 2, 2, 0 },
                { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
                        8100, 0x18, 0x04, 22,
                        3, 3, 2, 3, 3, 3, 3, 0 },
                { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
                        5400, 0x0b, 0x00, 12,
                        4, 2, 1, 4, 4, 4, 4, 0 },
                { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
                        7800, 0x0f, 0x00, 18,
                        4, 3, 1, 5, 5, 5, 5, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
                        10100, 0x0a, 0x00, 24,
                        6, 4, 1, 6, 6, 6, 6, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
                        14100,  0x0e, 0x00, 36,
                        6, 6, 2, 7, 7, 7, 7, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
                        17700, 0x09, 0x00, 48,
                        8, 10, 3, 8, 8, 8, 8, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
                        23700, 0x0d, 0x00, 72,
                        8, 14, 3, 9, 9, 9, 9, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
                        27400, 0x08, 0x00, 96,
                        8, 20, 3, 10, 10, 10, 10, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
                        30900, 0x0c, 0x00, 108,
                        8, 23, 3, 11, 11, 11, 11, 0 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
                        6400, 0x80, 0x00, 0,
                        4, 2, 3, 12, 28, 12, 28, 3216 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
                        12700, 0x81, 0x00, 1,
                        6, 4, 3, 13, 29, 13, 29, 6434 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
                        18800, 0x82, 0x00, 2,
                        6, 6, 3, 14, 30, 14, 30, 9650 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
                        25000, 0x83, 0x00, 3,
                        8, 10, 3, 15, 31, 15, 31, 12868 },
                { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
                        36700, 0x84, 0x00, 4,
                        8, 14, 3, 16, 32, 16, 32, 19304 },
                { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
                        48100, 0x85, 0x00, 5,
                        8, 20, 3, 17, 33, 17, 33, 25740 },
                { INVALID,  VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
                        53500, 0x86, 0x00, 6,
                        8, 23, 3, 18, 34, 18, 34, 28956 },
                { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
                        59000, 0x87, 0x00, 7,
                        8, 25, 3, 19, 35, 19, 36, 32180 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
                        12700, 0x88, 0x00, 8,
                        4, 2, 3, 20, 37, 20, 37, 6430 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
                        24800, 0x89, 0x00, 9,
                        6, 4, 3, 21, 38, 21, 38, 12860 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
                        36600, 0x8a, 0x00, 10,
                        6, 6, 3, 22, 39, 22, 39, 19300 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
                        48100, 0x8b, 0x00, 11,
                        8, 10, 3, 23, 40, 23, 40, 25736 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
                        69500, 0x8c, 0x00, 12,
                        8, 14, 3, 24, 41, 24, 41, 38600 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
                        89500, 0x8d, 0x00, 13,
                        8, 20, 3, 25, 42, 25, 42, 51472 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
                        98900, 0x8e, 0x00, 14,
                        8, 23, 3, 26, 43, 26, 44, 57890 },
                { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
                        108300, 0x8f, 0x00, 15,
                        8, 25, 3, 27, 44, 27, 45, 64320 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
                        13200, 0x80, 0x00, 0,
                        8, 2, 3, 12, 28, 28, 28, 6684 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
                        25900, 0x81, 0x00, 1,
                        8, 4, 3, 13, 29, 29, 29, 13368 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
                        38600, 0x82, 0x00, 2,
                        8, 6, 3, 14, 30, 30, 30, 20052 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
                        49800, 0x83, 0x00, 3,
                        8, 10, 3, 15, 31, 31, 31, 26738 },
                { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
                        72200, 0x84, 0x00, 4,
                        8, 14, 3, 16, 32, 32, 32, 40104 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
                        92900, 0x85, 0x00, 5,
                        8, 20, 3, 17, 33, 33, 33, 53476 },
                { INVALID,  VALID_40, WLAN_RC_PHY_HT_40_SS,
                        121500, /* 121.5 Mb */
                        102700, 0x86, 0x00, 6,
                        8, 23, 3, 18, 34, 34, 34, 60156 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
                        112000, 0x87, 0x00, 7,
                        8, 23, 3, 19, 35, 36, 36, 66840 },
                { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI,
                        150000, /* 150 Mb */
                        122000, 0x87, 0x00, 7,
                        8, 25, 3, 19, 35, 36, 36, 74200 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
                        25800, 0x88, 0x00, 8,
                        8, 2, 3, 20, 37, 37, 37, 13360 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
                        49800, 0x89, 0x00, 9,
                        8, 4, 3, 21, 38, 38, 38, 26720 },
                { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
                        71900, 0x8a, 0x00, 10,
                        8, 6, 3, 22, 39, 39, 39, 40080 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
                        92500, 0x8b, 0x00, 11,
                        8, 10, 3, 23, 40, 40, 40, 53440 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
                        130300, 0x8c, 0x00, 12,
                        8, 14, 3, 24, 41, 41, 41, 80160 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
                        162800, 0x8d, 0x00, 13,
                        8, 20, 3, 25, 42, 42, 42, 106880 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
                        178200, 0x8e, 0x00, 14,
                        8, 23, 3, 26, 43, 43, 43, 120240 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
                        192100, 0x8f, 0x00, 15,
                        8, 23, 3, 27, 44, 45, 45, 133600 },
                { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI,
                        300000, /* 300 Mb */
                        207000, 0x8f, 0x00, 15,
                        8, 25, 3, 27, 44, 45, 45, 148400 },
                },
        50,  /* probe interval */
        50,  /* rssi reduce interval */
        WLAN_RC_HT_FLAG,  /* Phy rates allowed initially */
};

static struct ath_rate_table ar5416_11a_ratetable = {
        8,
        {0},
        {
                { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
                        5400, 0x0b, 0x00, (0x80|12),
                        0, 2, 1, 0, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
                        7800, 0x0f, 0x00, 18,
                        0, 3, 1, 1, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
                        10000, 0x0a, 0x00, (0x80|24),
                        2, 4, 2, 2, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
                        13900, 0x0e, 0x00, 36,
                        2, 6, 2, 3, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
                        17300, 0x09, 0x00, (0x80|48),
                        4, 10, 3, 4, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
                        23000, 0x0d, 0x00, 72,
                        4, 14, 3, 5, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
                        27400, 0x08, 0x00, 96,
                        4, 19, 3, 6, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
                        29300, 0x0c, 0x00, 108,
                        4, 23, 3, 7, 0 },
        },
        50,  /* probe interval */
        50,  /* rssi reduce interval */
        0,   /* Phy rates allowed initially */
};

static struct ath_rate_table ar5416_11g_ratetable = {
        12,
        {0},
        {
                { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
                        900, 0x1b, 0x00, 2,
                        0, 0, 1, 0, 0 },
                { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
                        1900, 0x1a, 0x04, 4,
                        1, 1, 1, 1, 0 },
                { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
                        4900, 0x19, 0x04, 11,
                        2, 2, 2, 2, 0 },
                { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
                        8100, 0x18, 0x04, 22,
                        3, 3, 2, 3, 0 },
                { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
                        5400, 0x0b, 0x00, 12,
                        4, 2, 1, 4, 0 },
                { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
                        7800, 0x0f, 0x00, 18,
                        4, 3, 1, 5, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
                        10000, 0x0a, 0x00, 24,
                        6, 4, 1, 6, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
                        13900, 0x0e, 0x00, 36,
                        6, 6, 2, 7, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
                        17300, 0x09, 0x00, 48,
                        8, 10, 3, 8, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
                        23000, 0x0d, 0x00, 72,
                        8, 14, 3, 9, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
                        27400, 0x08, 0x00, 96,
                        8, 19, 3, 10, 0 },
                { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
                        29300, 0x0c, 0x00, 108,
                        8, 23, 3, 11, 0 },
        },
        50,  /* probe interval */
        50,  /* rssi reduce interval */
        0,   /* Phy rates allowed initially */
};

static struct ath_rate_table ar5416_11b_ratetable = {
        4,
        {0},
        {
                { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
                        900, 0x1b,  0x00, (0x80|2),
                        0, 0, 1, 0, 0 },
                { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
                        1800, 0x1a, 0x04, (0x80|4),
                        1, 1, 1, 1, 0 },
                { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
                        4300, 0x19, 0x04, (0x80|11),
                        1, 2, 2, 2, 0 },
                { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
                        7100, 0x18, 0x04, (0x80|22),
                        1, 4, 100, 3, 0 },
        },
        100, /* probe interval */
        100, /* rssi reduce interval */
        0,   /* Phy rates allowed initially */
};

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
arn_rc_sort_validrates(struct ath_rate_table *rate_table,
    struct ath_rate_priv *ath_rc_priv)
{
        uint8_t 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
arn_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
{
        uint8_t i;

        for (i = 0; i < ath_rc_priv->rate_table_size; i++)
                ath_rc_priv->valid_rate_index[i] = 0;
}

static inline void
arn_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
    uint8_t index, int valid_tx_rate)
{
        ASSERT(index <= ath_rc_priv->rate_table_size);
        ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
}

static inline int
/* LINTED E_STATIC_UNUSED */
arn_rc_isvalid_txmask(struct ath_rate_priv *ath_rc_priv, uint8_t index)
{
        ASSERT(index <= ath_rc_priv->rate_table_size);
        return (ath_rc_priv->valid_rate_index[index]);
}

/* ARGSUSED */
static inline int
arn_rc_get_nextvalid_txrate(struct ath_rate_table *rate_table,
    struct ath_rate_priv *ath_rc_priv,
    uint8_t cur_valid_txrate,
    uint8_t *next_idx)
{
        uint8_t 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
arn_rc_valid_phyrate(uint32_t phy, uint32_t 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);
                if (!WLAN_RC_PHY_40(phy) && (capflag & WLAN_RC_40_FLAG))
                        return (0);
        }
        return (1);
}

/* ARGSUSED */
static inline int
arn_rc_get_nextlowervalid_txrate(struct ath_rate_table *rate_table,
    struct ath_rate_priv *ath_rc_priv,
    uint8_t cur_valid_txrate, uint8_t *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 uint8_t
arn_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
    struct ath_rate_table *rate_table, uint32_t capflag)
{
        uint8_t i, hi = 0;
        uint32_t valid;

        for (i = 0; i < rate_table->rate_cnt; i++) {
                valid = (ath_rc_priv->single_stream ?
                    rate_table->info[i].valid_single_stream :
                    rate_table->info[i].valid);
                if (valid == 1) {
                        uint32_t phy = rate_table->info[i].phy;
                        uint8_t valid_rate_count = 0;

                        if (!arn_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;
                        arn_rc_set_valid_txmask(ath_rc_priv, i, 1);
                        hi = A_MAX(hi, i);
                }
        }

        return (hi);
}

static uint8_t
arn_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
    struct ath_rate_table *rate_table,
    struct ath_rateset *rateset,
    uint32_t capflag)
{
        uint8_t 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++) {
                        uint32_t phy = rate_table->info[j].phy;
                        uint32_t valid = (ath_rc_priv->single_stream ?
                            rate_table->info[j].valid_single_stream :
                            rate_table->info[j].valid);
                        uint8_t rate = rateset->rs_rates[i];
                        uint8_t 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 & 0x7F) == (dot11rate & 0x7F)) &&
                            ((valid & WLAN_RC_CAP_MODE(capflag)) ==
                            WLAN_RC_CAP_MODE(capflag)) &&
                            !WLAN_RC_PHY_HT(phy)) {
                                uint8_t valid_rate_count = 0;

                                if (!arn_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;
                                arn_rc_set_valid_txmask(ath_rc_priv, j, 1);
                                hi = A_MAX(hi, j);
                        }
                }
        }

        return (hi);
}

static uint8_t
arn_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
    struct ath_rate_table *rate_table,
    uint8_t *mcs_set, uint32_t capflag)
{
        struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;

        uint8_t 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++) {
                        uint32_t phy = rate_table->info[j].phy;
                        uint32_t valid = (ath_rc_priv->single_stream ?
                            rate_table->info[j].valid_single_stream :
                            rate_table->info[j].valid);
                        uint8_t rate = rateset->rs_rates[i];
                        uint8_t dot11rate = rate_table->info[j].dot11rate;

                        if (((rate & 0x7F) != (dot11rate & 0x7F)) ||
                            !WLAN_RC_PHY_HT(phy) ||
                            !WLAN_RC_PHY_HT_VALID(valid, capflag))
                                continue;

                        if (!arn_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;
                        arn_rc_set_valid_txmask(ath_rc_priv, j, 1);
                        hi = A_MAX(hi, j);
                }
        }

        return (hi);
}

/* ARGSUSED */
static uint8_t
arn_rc_ratefind_ht(struct arn_softc *sc,
    struct ath_rate_priv *ath_rc_priv,
    struct ath_rate_table *rate_table,
    int probe_allowed, int *is_probing,
    int is_retry)
{
        uint32_t dt, best_thruput, this_thruput, now_msec;
        uint8_t rate, next_rate, best_rate, maxindex, minindex;
        int8_t  rssi_last, rssi_reduce = 0, index = 0;

        *is_probing = 0;

        rssi_last = median(ath_rc_priv->rssi_last,
            ath_rc_priv->rssi_last_prev,
            ath_rc_priv->rssi_last_prev2);

        /*
         * Age (reduce) last ack rssi based on how old it is.
         * The bizarre numbers are so the delta is 160msec,
         * meaning we divide by 16.
         * 0msec   <= dt <= 25msec: don't derate
         * 25msec  <= dt <= 185msec: derate linearly from 0 to 10dB
         * 185msec <= dt: derate by 10dB
         */

        /* now_msec = jiffies_to_msecs(jiffies); */
        now_msec = drv_hztousec(ddi_get_lbolt())/1000; /* mescs ? */
        dt = now_msec - ath_rc_priv->rssi_time;

        if (dt >= 185)
                rssi_reduce = 10;
        else if (dt >= 25)
                rssi_reduce = (uint8_t)((dt - 25) >> 4);

        /* Now reduce rssi_last by rssi_reduce */
        if (rssi_last < rssi_reduce)
                rssi_last = 0;
        else
                rssi_last -= rssi_reduce;

        /*
         * Now look up the rate in the rssi table and return it.
         * If no rates match then we return 0 (lowest rate)
         */

        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--) {
                uint8_t 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->state[rate].per;
                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;

        /*
         * if we are retrying for more than half the number
         * of max retries, use the min rate for the next retry
         */
        if (is_retry)
                rate = ath_rc_priv->valid_rate_index[minindex];

        ath_rc_priv->rssi_last_lookup = rssi_last;

        /*
         * Must check the actual rate (ratekbps) to account for
         * non-monoticity of 11g's rate table
         */

        if (rate >= ath_rc_priv->rate_max_phy && probe_allowed) {
                rate = ath_rc_priv->rate_max_phy;

                /* Probe the next allowed phy state */
                /* FIXME:XXXX Check to make sure ratMax is checked properly */
                if (arn_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;

        ASSERT((rate_table->info[rate].valid && !ath_rc_priv->single_stream) ||
            (rate_table->info[rate].valid_single_stream &&
            ath_rc_priv->single_stream));

        return (rate);
}

static void
arn_rc_rate_set_series(struct ath_rate_table *rate_table,
    struct ath9k_tx_rate *rate,
    uint8_t tries,
    uint8_t rix,
    int rtsctsenable)
{
#if 0
        struct ieee80211_node *in;
        ieee80211com_t *ic = (ieee80211com_t *)sc;
#endif
        rate->count = tries;
        rate->idx = rix;

        if (rtsctsenable)
                rate->flags |= ATH9K_TX_RC_USE_RTS_CTS;
#if 0
        if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
            (in->in_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
                rate->flags |= ATH9K_TX_RC_USE_SHORT_PREAMBLE;
        }
#endif
        if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
                rate->flags |= ATH9K_TX_RC_40_MHZ_WIDTH;
        if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
                rate->flags |= ATH9K_TX_RC_SHORT_GI;
        if (WLAN_RC_PHY_HT(rate_table->info[rix].phy))
                rate->flags |= ATH9K_TX_RC_MCS;
}

/* ARGSUSED */
static uint8_t
arn_rc_rate_getidx(struct arn_softc *sc,
    struct ath_rate_priv *ath_rc_priv,
    struct ath_rate_table *rate_table,
    uint8_t rix, uint16_t stepdown,
    uint16_t min_rate)
{
        uint32_t j;
        uint8_t nextindex;

        if (min_rate) {
                for (j = RATE_TABLE_SIZE; j > 0; j--) {
                        if (arn_rc_get_nextlowervalid_txrate(rate_table,
                            ath_rc_priv, rix, &nextindex))
                                rix = nextindex;
                        else
                                break;
                }
        } else {
                for (j = stepdown; j > 0; j--) {
                        if (arn_rc_get_nextlowervalid_txrate(rate_table,
                            ath_rc_priv, rix, &nextindex))
                                rix = nextindex;
                        else
                                break;
                }
        }
        return (rix);
}

static void
arn_rc_ratefind(struct arn_softc *sc, struct ath_rate_priv *ath_rc_priv,
    struct ath_buf *bf, int num_tries, int num_rates, int *is_probe,
    boolean_t is_retry)
{
        uint8_t try_per_rate = 0, i = 0, rix, nrix;
        struct ath_rate_table *rate_table;
        struct ath9k_tx_rate *rates = bf->rates;
        ieee80211com_t *ic = (ieee80211com_t *)sc;

        rate_table = sc->sc_currates;
        rix = arn_rc_ratefind_ht(sc, ath_rc_priv, rate_table, 1,
            is_probe, is_retry);
        nrix = rix;

        if (*is_probe) {
                /*
                 * set one try for probe rates. For the
                 * probes don't enable rts
                 */
                arn_rc_rate_set_series(rate_table,
                    &rates[i++], 1, nrix, 0);

                try_per_rate = (num_tries/num_rates);
                /*
                 * Get the next tried/allowed rate. No RTS for the next series
                 * after the probe rate
                 */
                nrix = arn_rc_rate_getidx(sc,
                    ath_rc_priv, rate_table, nrix, 1, 0);
                arn_rc_rate_set_series(rate_table,
                    &rates[i++], try_per_rate, nrix, 0);
        } else {
                try_per_rate = (num_tries/num_rates);
                /* Set the choosen rate. No RTS for first series entry. */
                arn_rc_rate_set_series(rate_table,
                    &rates[i++], try_per_rate, nrix, 0);
        }

        /* Fill in the other rates for multirate retry */
        for (; i < num_rates; i++) {
                uint8_t try_num;
                uint8_t min_rate;

                try_num = ((i + 1) == num_rates) ?
                    num_tries - (try_per_rate * i) : try_per_rate;
                /* LINTED E_FALSE_LOGICAL_EXPR */
                min_rate = (((i + 1) == num_rates) && 0);

                nrix = arn_rc_rate_getidx(sc, ath_rc_priv,
                    rate_table, nrix, 1, min_rate);
                /* All other rates in the series have RTS enabled */
                arn_rc_rate_set_series(rate_table, &rates[i], try_num, nrix, 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 (IEEE80211_IS_CHAN_HTG(ic->ic_curchan)) {
                uint8_t dot11rate = rate_table->info[rix].dot11rate;
                uint8_t 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;
                }
        }
}

/* ARGSUSED */
static boolean_t
arn_rc_update_per(struct arn_softc *sc,
    struct ath_rate_table *rate_table,
    struct ath_rate_priv *ath_rc_priv,
    struct ath_tx_info_priv *tx_info_priv,
    int tx_rate, int xretries, int retries,
    uint32_t now_msec)
{
        boolean_t state_change = B_FALSE;
        int count;
        uint8_t last_per;
        static uint32_t 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->state[tx_rate].per;

        if (xretries) {
                if (xretries == 1) {
                        ath_rc_priv->state[tx_rate].per += 30;
                        if (ath_rc_priv->state[tx_rate].per > 100)
                                ath_rc_priv->state[tx_rate].per = 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->state[tx_rate].per =
                            (uint8_t)(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 (tx_info_priv->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_priv->n_frames > 0) {
                                int n_frames, n_bad_frames;
                                uint8_t cur_per, new_per;

                                n_bad_frames = retries *
                                    tx_info_priv->n_frames +
                                    tx_info_priv->n_bad_frames;
                                n_frames =
                                    tx_info_priv->n_frames * (retries + 1);
                                cur_per =
                                    (100 * n_bad_frames / n_frames) >> 3;
                                new_per = (uint8_t)
                                    (last_per - (last_per >> 3) + cur_per);
                                ath_rc_priv->state[tx_rate].per = new_per;
                        }
                } else {
                        ath_rc_priv->state[tx_rate].per =
                            (uint8_t)(last_per - (last_per >> 3) +
                            (nretry_to_per_lookup[retries] >> 3));
                }

                ath_rc_priv->rssi_last_prev2 = ath_rc_priv->rssi_last_prev;
                ath_rc_priv->rssi_last_prev  = ath_rc_priv->rssi_last;
                ath_rc_priv->rssi_last = tx_info_priv->tx.ts_rssi;
                ath_rc_priv->rssi_time = now_msec;

                /*
                 * 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 * tx_info_priv->n_bad_frames >
                            tx_info_priv->n_frames) {
                                /*
                                 * 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 {
                                uint8_t 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->state[probe_rate].per > 30)
                                        ath_rc_priv->state[probe_rate].per = 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
                                 * succesful.
                                 */
                                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.
                         *
                         * Later: if rssi_ack is close to
                         * ath_rc_priv->state[txRate].rssi_thres and we see lots
                         * of retries, then we could increase
                         * ath_rc_priv->state[txRate].rssi_thres.
                         */
                        ath_rc_priv->hw_maxretry_pktcnt = 0;
                } else {
                        int32_t rssi_ackAvg;
                        int8_t rssi_thres;
                        int8_t rssi_ack_vmin;

                        /*
                         * 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++;
                        }

                        if (tx_info_priv->tx.ts_rssi <
                            rate_table->info[tx_rate].rssi_ack_validmin)
                                goto exit;

                        /* Average the rssi */
                        if (tx_rate != ath_rc_priv->rssi_sum_rate) {
                                ath_rc_priv->rssi_sum_rate = tx_rate;
                                ath_rc_priv->rssi_sum =
                                    ath_rc_priv->rssi_sum_cnt = 0;
                        }

                        ath_rc_priv->rssi_sum += tx_info_priv->tx.ts_rssi;
                        ath_rc_priv->rssi_sum_cnt++;

                        if (ath_rc_priv->rssi_sum_cnt < 4)
                                goto exit;

                        rssi_ackAvg =
                            (ath_rc_priv->rssi_sum + 2) / 4;
                        rssi_thres =
                            ath_rc_priv->state[tx_rate].rssi_thres;
                        rssi_ack_vmin =
                            rate_table->info[tx_rate].rssi_ack_validmin;

                        ath_rc_priv->rssi_sum =
                            ath_rc_priv->rssi_sum_cnt = 0;

                        /* Now reduce the current rssi threshold */
                        if ((rssi_ackAvg < rssi_thres + 2) &&
                            (rssi_thres > rssi_ack_vmin)) {
                                ath_rc_priv->state[tx_rate].rssi_thres--;
                        }

                        state_change = B_TRUE;
                }
        }
exit:
        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
arn_rc_update_ht(struct arn_softc *sc,
    struct ath_rate_priv *ath_rc_priv,
    struct ath_tx_info_priv *tx_info_priv,
    int tx_rate, int xretries, int retries)
{
#define CHK_RSSI(rate)                                  \
        ((ath_rc_priv->state[(rate)].rssi_thres +       \
            rate_table->info[(rate)].rssi_ack_deltamin) > \
            ath_rc_priv->state[(rate)+1].rssi_thres)

        /* u32 now_msec = jiffies_to_msecs(jiffies); */
        uint32_t now_msec = drv_hztousec(ddi_get_lbolt())/1000; /* mescs ? */
        int rate;
        uint8_t last_per;
        boolean_t state_change = B_FALSE;
        struct ath_rate_table *rate_table = sc->sc_currates;
        int size = ath_rc_priv->rate_table_size;

        if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
                return;

        /* To compensate for some imbalance between ctrl and ext. channel */

        if (WLAN_RC_PHY_40(rate_table->info[tx_rate].phy))
                tx_info_priv->tx.ts_rssi =
                    tx_info_priv->tx.ts_rssi < 3 ? 0 :
                    tx_info_priv->tx.ts_rssi - 3;

        last_per = ath_rc_priv->state[tx_rate].per;

        /* Update PER first */
        state_change = arn_rc_update_per(sc, rate_table, ath_rc_priv,
            tx_info_priv, 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->state[tx_rate].per >= 55 && tx_rate > 0 &&
            rate_table->info[tx_rate].ratekbps <=
            rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
                (void) arn_rc_get_nextlowervalid_txrate(rate_table,
                    ath_rc_priv,
                    (uint8_t)tx_rate,
                    &ath_rc_priv->rate_max_phy);

                /* Don't probe for a little while. */
                ath_rc_priv->probe_time = now_msec;
        }

        if (state_change) {
                /*
                 * Make sure the rates above this have higher rssi thresholds.
                 * (Note:  Monotonicity is kept within the OFDM rates and
                 * within the CCK rates. However, no adjustment is
                 * made to keep the rssi thresholds monotonically
                 * increasing between the CCK and OFDM rates.)
                 */
                for (rate = tx_rate; rate < size - 1; rate++) {
                        if (rate_table->info[rate+1].phy !=
                            rate_table->info[tx_rate].phy)
                                break;

                        if (CHK_RSSI(rate)) {
                                ath_rc_priv->state[rate+1].rssi_thres =
                                    ath_rc_priv->state[rate].rssi_thres +
                                    rate_table->info[rate].rssi_ack_deltamin;
                        }
                }

                /* Make sure the rates below this have lower rssi thresholds. */
                for (rate = tx_rate - 1; rate >= 0; rate--) {
                        if (rate_table->info[rate].phy !=
                            rate_table->info[tx_rate].phy)
                                break;

                        if (CHK_RSSI(rate)) {
                                if (ath_rc_priv->state[rate+1].rssi_thres <
                                    rate_table->info[rate].rssi_ack_deltamin)
                                        ath_rc_priv->state[rate].rssi_thres = 0;
                                else {
                                        ath_rc_priv->state[rate].rssi_thres =
                                            ath_rc_priv->state[rate+1].
                                            rssi_thres -
                                            rate_table->info[rate].
                                            rssi_ack_deltamin;
                                }

                                if (ath_rc_priv->state[rate].rssi_thres <
                                    rate_table->info[rate].rssi_ack_validmin) {
                                        ath_rc_priv->state[rate].rssi_thres =
                                            rate_table->info[rate].
                                            rssi_ack_validmin;
                                }
                        }
                }
        }

        /* Make sure the rates below this have lower PER */
        /* Monotonicity is kept only for rates below the current rate. */
        if (ath_rc_priv->state[tx_rate].per < last_per) {
                for (rate = tx_rate - 1; rate >= 0; rate--) {
                        if (rate_table->info[rate].phy !=
                            rate_table->info[tx_rate].phy)
                                break;

                        if (ath_rc_priv->state[rate].per >
                            ath_rc_priv->state[rate+1].per) {
                                ath_rc_priv->state[rate].per =
                                    ath_rc_priv->state[rate+1].per;
                        }
                }
        }

        /* Maintain monotonicity for rates above the current rate */
        for (rate = tx_rate; rate < size - 1; rate++) {
                if (ath_rc_priv->state[rate+1].per <
                    ath_rc_priv->state[rate].per)
                        ath_rc_priv->state[rate+1].per =
                            ath_rc_priv->state[rate].per;
        }

        /*
         * Every so often, we reduce the thresholds and
         * PER (different for CCK and OFDM).
         */
        if (now_msec - ath_rc_priv->rssi_down_time >=
            rate_table->rssi_reduce_interval) {

                for (rate = 0; rate < size; rate++) {
                        if (ath_rc_priv->state[rate].rssi_thres >
                            rate_table->info[rate].rssi_ack_validmin)
                                ath_rc_priv->state[rate].rssi_thres -= 1;
                }
                ath_rc_priv->rssi_down_time = now_msec;
        }

        /*
         * 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->rssi_reduce_interval) {
                for (rate = 0; rate < size; rate++) {
                        ath_rc_priv->state[rate].per =
                            7 * ath_rc_priv->state[rate].per / 8;
                }

                ath_rc_priv->per_down_time = now_msec;
        }

#undef CHK_RSSI
}

static int
ath_rc_get_rateindex(struct ath_rate_table *rate_table,
    struct ath9k_tx_rate *rate)
{
        int rix;

        if ((rate->flags & ATH9K_TX_RC_40_MHZ_WIDTH) &&
            (rate->flags & ATH9K_TX_RC_SHORT_GI))
                rix = rate_table->info[rate->idx].ht_index;
        else if (rate->flags & ATH9K_TX_RC_SHORT_GI)
                rix = rate_table->info[rate->idx].sgi_index;
        else if (rate->flags & ATH9K_TX_RC_40_MHZ_WIDTH)
                rix = rate_table->info[rate->idx].cw40index;
        else
                rix = rate_table->info[rate->idx].base_index;

        return (rix);
}

static void
ath_rc_tx_status(struct arn_softc *sc, struct ath_rate_priv *ath_rc_priv,
    struct ath_buf *bf, int final_ts_idx, int xretries, int long_retry)
{
        struct ath_tx_info_priv *tx_info_priv =
            (struct ath_tx_info_priv *)&bf->tx_info_priv;
        struct ath9k_tx_rate *rates = bf->rates;
        struct ath_rate_table *rate_table;
        uint32_t i = 0, rix;
        uint8_t flags;

        rate_table = sc->sc_currates;

        /*
         * 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 & ATH9K_TX_RC_40_MHZ_WIDTH) &&
                                    (ath_rc_priv->rc_phy_mode !=
                                    WLAN_RC_40_FLAG))
                                        return;

                                rix =
                                    ath_rc_get_rateindex(rate_table, &rates[i]);
                                arn_rc_update_ht(sc, ath_rc_priv,
                                    tx_info_priv, 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 & ATH9K_TX_RC_40_MHZ_WIDTH) &&
            (ath_rc_priv->rc_phy_mode != WLAN_RC_40_FLAG)) {
                return;
        }

        rix = ath_rc_get_rateindex(rate_table, &rates[i]);
        arn_rc_update_ht(sc, ath_rc_priv, tx_info_priv, rix,
            xretries, long_retry);
}

static struct ath_rate_table *
arn_choose_rate_table(struct arn_softc *sc, uint32_t cur_mode,
    boolean_t is_ht, boolean_t is_cw_40)
{
        int ath9k_mode;
        switch (cur_mode) {
        case IEEE80211_MODE_11A:
        case IEEE80211_MODE_11NA:
                ath9k_mode = ATH9K_MODE_11A;
                if (is_ht)
                        ath9k_mode = ATH9K_MODE_11NA_HT20;
                if (is_cw_40)
                        ath9k_mode = ATH9K_MODE_11NA_HT40PLUS;
                break;
        case IEEE80211_MODE_11B:
                ath9k_mode = ATH9K_MODE_11B;
                break;
        case IEEE80211_MODE_11G:
        case IEEE80211_MODE_11NG:
                ath9k_mode = ATH9K_MODE_11G;
                if (is_ht)
                        ath9k_mode = ATH9K_MODE_11NG_HT20;
                if (is_cw_40)
                        ath9k_mode = ATH9K_MODE_11NG_HT40PLUS;
                break;
        default:
                ARN_DBG((ARN_DBG_RATE, "Invalid band\n"));
                return (NULL);
        }

        switch (ath9k_mode) {
        case ATH9K_MODE_11A:
                ARN_DBG((ARN_DBG_RATE, "choose rate table:ATH9K_MODE_11A\n"));
                break;
        case ATH9K_MODE_11B:
                ARN_DBG((ARN_DBG_RATE, "choose rate table:ATH9K_MODE_11B\n"));
                break;
        case ATH9K_MODE_11G:
                ARN_DBG((ARN_DBG_RATE, "choose rate table:ATH9K_MODE_11G\n"));
                break;
        case ATH9K_MODE_11NA_HT20:
                ARN_DBG((ARN_DBG_RATE,
                    "choose rate table:ATH9K_MODE_11NA_HT20\n"));
                break;
        case ATH9K_MODE_11NA_HT40PLUS:
                ARN_DBG((ARN_DBG_RATE,
                    "choose rate table:ATH9K_MODE_11NA_HT40PLUS\n"));
                break;
        case ATH9K_MODE_11NG_HT20:
                ARN_DBG((ARN_DBG_RATE,
                    "choose rate table:ATH9K_MODE_11NG_HT20\n"));
                break;
        case ATH9K_MODE_11NG_HT40PLUS:
                ARN_DBG((ARN_DBG_RATE,
                    "choose rate table:ATH9K_MODE_11NG_HT40PLUS\n"));
                break;
        default:
                arn_problem("Invalid band\n");
                break;
        }

        ARN_DBG((ARN_DBG_RATE, "Choosing rate table for mode: %d\n",
            ath9k_mode));
        return (sc->hw_rate_table[ath9k_mode]);
}

/* Private rate contral initialization */
static void
arn_rc_init(struct arn_softc *sc,
    struct ath_rate_priv *ath_rc_priv,
    struct ieee80211_node *in)
{
        struct ath_rate_table *rate_table = NULL;
        struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
        ieee80211com_t *ic = (ieee80211com_t *)sc;
        uint32_t cur_mode = ic->ic_curmode;
        uint8_t *ht_mcs = (uint8_t *)&ath_rc_priv->neg_ht_rates;
        uint8_t i, j, k, hi = 0, hthi = 0;
        boolean_t is_rc_ds;

        /* FIXME: Adhoc */
        if ((sc->sc_ah->ah_opmode == ATH9K_M_STA) ||
            (sc->sc_ah->ah_opmode == ATH9K_M_IBSS)) {
                boolean_t is_ht = in->in_flags & IEEE80211_NODE_HT;
                /* 20/40 support */
                boolean_t is_cw_40 =
                    in->in_htcap & IEEE80211_HTCAP_CHWIDTH40;
                rate_table =
                    arn_choose_rate_table(sc, cur_mode, is_ht, is_cw_40);
        } else if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) {
                /* cur_rate_table would be set on init */
                rate_table = sc->sc_currates;
        }

        if (!rate_table) {
                ARN_DBG((ARN_DBG_FATAL, "Rate table not initialized\n"));
                return;
        }

        if (in->in_flags & IEEE80211_NODE_HT) {
                /* 2.6.30 */
                ath_rc_priv->ht_cap = WLAN_RC_HT_FLAG;
                is_rc_ds = (AR_SREV_9280_20_OR_LATER(sc->sc_ah) &&
                    (ath9k_hw_get_eeprom(sc->sc_ah, EEP_RC_CHAIN_MASK) == 1)) ?
                    B_FALSE: B_TRUE;
                if (sc->sc_ah->ah_caps.tx_chainmask != 1 && is_rc_ds) {
                        if (sc->sc_ht_conf.rx_mcs_mask[1]) {
                                ath_rc_priv->ht_cap |= WLAN_RC_DS_FLAG;
                        }
                }

                if (in->in_htcap & IEEE80211_HTCAP_CHWIDTH40)
                        ath_rc_priv->ht_cap |= WLAN_RC_40_FLAG;
                if (in->in_htcap & IEEE80211_HTCAP_SHORTGI40)
                        ath_rc_priv->ht_cap |= WLAN_RC_SGI_FLAG;
        }

        /*
         * 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->state[i].rssi_thres =
                    rate_table->info[i].rssi_ack_validmin;
                ath_rc_priv->state[i].per = 0;
        }

        /* Determine the valid rates */
        arn_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;
        }
        ath_rc_priv->rc_phy_mode = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG);

        /* Set stream capability */
        ath_rc_priv->single_stream =
            (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ? 0 : 1;

        if (!rateset->rs_nrates) {
                /* No working rate, just initialize valid rates */
                hi = arn_rc_init_validrates(ath_rc_priv, rate_table,
                    ath_rc_priv->ht_cap);
        } else {
                /* Use intersection of working rates and valid rates */
                hi = arn_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 = arn_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;
        ASSERT(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 (!arn_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];
        }
        ASSERT(ath_rc_priv->rate_table_size <= RATE_TABLE_SIZE);
        ASSERT(k <= RATE_TABLE_SIZE);

        ath_rc_priv->max_valid_rate = k;
        arn_rc_sort_validrates(rate_table, ath_rc_priv);
        ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
        sc->sc_currates = rate_table;
}

void
arn_tx_status(struct arn_softc *sc, struct ath_buf *bf, boolean_t is_data)
{
        struct ieee80211_node *in = (struct ieee80211_node *)(bf->bf_in);
        struct ath_node *an = ATH_NODE(in);
        struct ath_rate_priv *ath_rc_priv =
            (struct ath_rate_priv *)&an->rate_priv;
        struct ath_tx_info_priv *tx_info_priv =
            (struct ath_tx_info_priv *)&bf->tx_info_priv;
        int final_ts_idx, tx_status = 0, is_underrun = 0;

        final_ts_idx = tx_info_priv->tx.ts_rateindex;

        if (!is_data || !tx_info_priv->update_rc)
                return;

        if (tx_info_priv->tx.ts_status & ATH9K_TXERR_FILT)
                return;

        /*
         * If underrun error is seen assume it as an excessive retry only
         * if prefetch trigger level have reached the max (0x3f for 5416)
         * Adjust the long retry as if the frame was tried ATH_11N_TXMAXTRY
         * times. This affects how ratectrl updates PER for the failed rate.
         */
        if (tx_info_priv->tx.ts_flags &
            (ATH9K_TX_DATA_UNDERRUN | ATH9K_TX_DELIM_UNDERRUN) &&
            ((sc->sc_ah->ah_txTrigLevel) >= ath_rc_priv->tx_triglevel_max)) {
                tx_status = 1;
                is_underrun = 1;
        }

        if ((tx_info_priv->tx.ts_status & ATH9K_TXERR_XRETRY) ||
            (tx_info_priv->tx.ts_status & ATH9K_TXERR_FIFO))
                tx_status = 1;

        ath_rc_tx_status(sc,
            ath_rc_priv,
            bf,
            final_ts_idx,
            tx_status,
            (is_underrun) ? ATH_11N_TXMAXTRY : tx_info_priv->tx.ts_longretry);
}

void
arn_get_rate(struct arn_softc *sc, struct ath_buf *bf,
    struct ieee80211_frame *wh)
{
        struct ieee80211_node *in = (struct ieee80211_node *)(bf->bf_in);
        struct ath_node *an = ATH_NODE(in);
        struct ath_rate_priv *ath_rc_priv =
            (struct ath_rate_priv *)&an->rate_priv;
        struct ath_rate_table *rt = sc->sc_currates;
        ieee80211com_t *ic = (ieee80211com_t *)sc;
        int is_probe = 0;
        uint8_t i;

        /* lowest rate for management and multicast/broadcast frames */
        if (!IEEE80211_IS_DATA(wh) || IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                bf->rates[0].idx = 0; /* xxx Fix me */
                bf->rates[0].count =
                    IEEE80211_IS_MULTICAST(wh->i_addr1) ?
                    1 : ATH_MGT_TXMAXTRY;
                return;
        }

        /* Find tx rate for unicast frames */
        arn_rc_ratefind(sc, ath_rc_priv, bf, ATH_11N_TXMAXTRY, 4,
            &is_probe, B_FALSE);

        /* Temporary workaround for 'dladm show-wifi' */
        for (i = 0; i < in->in_rates.ir_nrates; i++) {
                ARN_DBG((ARN_DBG_RATE, "arn: arn_get_rate(): "
                    "in->in_rates.ir_rates[%d] = %d,"
                    "bf->rates[0].idx = %d,"
                    "rt->info[bf->rates[0].idx].dot11rate = %d\n",
                    i,
                    in->in_rates.ir_rates[i],
                    bf->rates[0].idx,
                    rt->info[bf->rates[0].idx].dot11rate));
                if (rt->info[bf->rates[0].idx].dot11rate ==
                    in->in_rates.ir_rates[i])
                        break;
        }
        in->in_txrate = i;
        if (ic->ic_curmode == IEEE80211_MODE_11NA ||
            ic->ic_curmode == IEEE80211_MODE_11NG)
                in->in_txrate = in->in_rates.ir_nrates - 1;

        /* Check if aggregation has to be enabled for this tid */
#ifdef ARN_TX_AGGREGATION
        /* should check if enabled, not supported */
        if (sc->sc_ht_conf.ht_supported) {
                if (ieee80211_is_data_qos(wh)) {
                        uint8_t *qc, tid;
                        struct ath_node *an;
                        struct ieee80211_qosframe *qwh = NULL;

                        qwh = (struct ieee80211_qosframe *)wh;
                        tid = qc[0] & 0xf;
                        an = (struct ath_node *)sta->drv_priv;

                        if (arn_tx_aggr_check(sc, an, tid))
                                /* to do */
                }
        }
#endif /* ARN_TX_AGGREGATION */
}

void
arn_rate_init(struct arn_softc *sc, struct ieee80211_node *in)
{
        int i;
        struct ath_node *an = ATH_NODE(in);
        struct ath_rate_priv *ath_rc_priv =
            (struct ath_rate_priv *)&an->rate_priv;

        /* should be moved to arn_node_init later */
        ath_rc_priv->rssi_down_time =
            drv_hztousec(ddi_get_lbolt())/1000; /* mesc */
        ath_rc_priv->tx_triglevel_max =
            sc->sc_ah->ah_caps.tx_triglevel_max;

        for (i = 0; i < in->in_rates.ir_nrates; i++) {
                ath_rc_priv->neg_rates.rs_rates[i] = in->in_rates.ir_rates[i];
                ARN_DBG((ARN_DBG_RATE, "arn:arn_rate_init()"
                    "ath_rc_priv->neg_rates.rs_rates[%d] = %d\n",
                    i, ath_rc_priv->neg_rates.rs_rates[i]));
        }
        ath_rc_priv->neg_rates.rs_nrates = in->in_rates.ir_nrates;

        /* negotiated ht rate set ??? */
        if (in->in_flags & IEEE80211_NODE_HT) {
                for (i = 0; i < in->in_htrates.rs_nrates; i++) {
                        ath_rc_priv->neg_ht_rates.rs_rates[i] =
                            in->in_htrates.rs_rates[i];
                        ARN_DBG((ARN_DBG_RATE, "arn:arn_rate_init()"
                            "ath_rc_priv->neg_ht_rates.rs_rates[%d] = %d\n",
                            i, ath_rc_priv->neg_ht_rates.rs_rates[i]));
                }
                ath_rc_priv->neg_ht_rates.rs_nrates = in->in_htrates.rs_nrates;

                /* arn_update_chainmask(sc); */
        }

#ifdef ARN_TX_AGGREGATION
        /* Temply put the following ht info init here */
        uint8_t ampdu_factor, ampdu_density;
        if (sc->sc_ht_conf.ht_support &&
            (in->in_htcap_ie != NULL) &&
            (in->in_htcap != 0) &&
            (in->in_htparam != 0)) {
                ampdu_factor = in->in_htparam & HT_RX_AMPDU_FACTOR_MSK;
                ampdu_density = (in->in_htparam & HT_MPDU_DENSITY_MSK) >>
                    HT_MPDU_DENSITY_POS;
                an->maxampdu =
                    1 << (IEEE80211_HTCAP_MAXRXAMPDU_FACTOR + ampdu_factor);
                an->mpdudensity = parse_mpdudensity(ampdu_density);
        }
        /* end */
#endif /* ARN_TX_AGGREGATION */

        arn_rc_init(sc, ath_rc_priv, in);
}

static void
arn_setup_rate_table(struct arn_softc *sc,
    struct ath_rate_table *rate_table)
{
        int i;

        for (i = 0; i < 256; i++)
                rate_table->rateCodeToIndex[i] = (uint8_t)-1;

        for (i = 0; i < rate_table->rate_cnt; i++) {
                uint8_t code = rate_table->info[i].ratecode;
                uint8_t cix = rate_table->info[i].ctrl_rate;
                uint8_t sh = rate_table->info[i].short_preamble;

                rate_table->rateCodeToIndex[code] = (int)i;
                rate_table->rateCodeToIndex[code | sh] = (int)i;

                rate_table->info[i].lpAckDuration =
                    ath9k_hw_computetxtime(sc->sc_ah, rate_table,
                    WLAN_CTRL_FRAME_SIZE,
                    cix,
                    B_FALSE);
                rate_table->info[i].spAckDuration =
                    ath9k_hw_computetxtime(sc->sc_ah, rate_table,
                    WLAN_CTRL_FRAME_SIZE,
                    cix,
                    B_TRUE);
        }
}

void
arn_rate_attach(struct arn_softc *sc)
{
        sc->hw_rate_table[ATH9K_MODE_11B] =
            &ar5416_11b_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11A] =
            &ar5416_11a_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11G] =
            &ar5416_11g_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11NA_HT20] =
            &ar5416_11na_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11NG_HT20] =
            &ar5416_11ng_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11NA_HT40PLUS] =
            &ar5416_11na_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11NA_HT40MINUS] =
            &ar5416_11na_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11NG_HT40PLUS] =
            &ar5416_11ng_ratetable;
        sc->hw_rate_table[ATH9K_MODE_11NG_HT40MINUS] =
            &ar5416_11ng_ratetable;

        arn_setup_rate_table(sc, &ar5416_11b_ratetable);
        arn_setup_rate_table(sc, &ar5416_11a_ratetable);
        arn_setup_rate_table(sc, &ar5416_11g_ratetable);
        arn_setup_rate_table(sc, &ar5416_11na_ratetable);
        arn_setup_rate_table(sc, &ar5416_11ng_ratetable);
}

#ifdef ARN_LEGACY_RC
void
arn_rate_update(struct arn_softc *sc, struct ieee80211_node *in, int32_t rate)
{
        struct ath_node *an = ATH_NODE(in);
        const struct ath_rate_table *rt = sc->sc_currates;
        uint8_t rix;

        ASSERT(rt != NULL);

        in->in_txrate = rate;

        /* management/control frames always go at the lowest speed */
        an->an_tx_mgtrate = rt->info[0].ratecode;
        an->an_tx_mgtratesp = an->an_tx_mgtrate | rt->info[0].short_preamble;

        ARN_DBG((ARN_DBG_RATE, "arn: arn_rate_update(): "
            "mgtrate=%d mgtratesp=%d\n",
            an->an_tx_mgtrate, an->an_tx_mgtratesp));

        /*
         * Before associating a node has no rate set setup
         * so we can't calculate any transmit codes to use.
         * This is ok since we should never be sending anything
         * but management frames and those always go at the
         * lowest hardware rate.
         */
        if (in->in_rates.ir_nrates == 0)
                goto done;
        an->an_tx_rix0 = sc->asc_rixmap[
            in->in_rates.ir_rates[rate] & IEEE80211_RATE_VAL];
        an->an_tx_rate0 = rt->info[an->an_tx_rix0].ratecode;
        an->an_tx_rate0sp = an->an_tx_rate0 |
            rt->info[an->an_tx_rix0].short_preamble;
        if (sc->sc_mrretry) {
                /*
                 * Hardware supports multi-rate retry; setup two
                 * step-down retry rates and make the lowest rate
                 * be the ``last chance''.  We use 4, 2, 2, 2 tries
                 * respectively (4 is set here, the rest are fixed
                 * in the xmit routine).
                 */
                an->an_tx_try0 = 1 + 3;         /* 4 tries at rate 0 */
                if (--rate >= 0) {
                        rix = sc->asc_rixmap[
                            in->in_rates.ir_rates[rate]&IEEE80211_RATE_VAL];
                        an->an_tx_rate1 = rt->info[rix].ratecode;
                        an->an_tx_rate1sp = an->an_tx_rate1 |
                            rt->info[rix].short_preamble;
                } else {
                        an->an_tx_rate1 = an->an_tx_rate1sp = 0;
                }
                if (--rate >= 0) {
                        rix = sc->asc_rixmap[
                            in->in_rates.ir_rates[rate]&IEEE80211_RATE_VAL];
                        an->an_tx_rate2 = rt->info[rix].ratecode;
                        an->an_tx_rate2sp = an->an_tx_rate2 |
                            rt->info[rix].short_preamble;
                } else {
                        an->an_tx_rate2 = an->an_tx_rate2sp = 0;
                }
                if (rate > 0) {
                        an->an_tx_rate3 = rt->info[0].ratecode;
                        an->an_tx_rate3sp =
                            an->an_tx_mgtrate | rt->info[0].short_preamble;
                } else {
                        an->an_tx_rate3 = an->an_tx_rate3sp = 0;
                }
        } else {
                an->an_tx_try0 = ATH_TXMAXTRY;  /* max tries at rate 0 */
                an->an_tx_rate1 = an->an_tx_rate1sp = 0;
                an->an_tx_rate2 = an->an_tx_rate2sp = 0;
                an->an_tx_rate3 = an->an_tx_rate3sp = 0;
        }
done:
        an->an_tx_ok = an->an_tx_err = an->an_tx_retr = an->an_tx_upper = 0;
}

/*
 * Set the starting transmit rate for a node.
 */
void
arn_rate_ctl_start(struct arn_softc *sc, struct ieee80211_node *in)
{
        ieee80211com_t *ic = (ieee80211com_t *)sc;
        int32_t srate;

        if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE) {
                /*
                 * No fixed rate is requested. For 11b start with
                 * the highest negotiated rate; otherwise, for 11g
                 * and 11a, we start "in the middle" at 24Mb or 36Mb.
                 */
                srate = in->in_rates.ir_nrates - 1;
                if (sc->sc_curmode != IEEE80211_MODE_11B) {
                        /*
                         * Scan the negotiated rate set to find the
                         * closest rate.
                         */
                        /* NB: the rate set is assumed sorted */
                        for (; srate >= 0 && IEEE80211_RATE(srate) > 72;
                            srate--) {}
                }
        } else {
                /*
                 * A fixed rate is to be used; We know the rate is
                 * there because the rate set is checked when the
                 * station associates.
                 */
                /* NB: the rate set is assumed sorted */
                srate = in->in_rates.ir_nrates - 1;
                for (; srate >= 0 && IEEE80211_RATE(srate) != ic->ic_fixed_rate;
                    srate--) {}
        }

        ARN_DBG((ARN_DBG_RATE, "arn: arn_rate_ctl_start(): "
            "srate=%d rate=%d\n", srate, IEEE80211_RATE(srate)));

        arn_rate_update(sc, in, srate);
}

void
arn_rate_cb(void *arg, struct ieee80211_node *in)
{
        arn_rate_update((struct arn_softc *)arg, in, 0);
}
#endif /* ARN_LEGACY_RC */
/*
 * Reset the rate control state for each 802.11 state transition.
 */
void
arn_rate_ctl_reset(struct arn_softc *sc, enum ieee80211_state state)
{
        ieee80211com_t *ic = (ieee80211com_t *)sc;
        struct ieee80211_node *in;

        if (ic->ic_opmode == IEEE80211_M_STA) {
                /*
                 * Reset local xmit state; this is really only
                 * meaningful when operating in station mode.
                 */
                in = (struct ieee80211_node *)ic->ic_bss;

#ifdef ARN_LEGACY_RC
                if (state == IEEE80211_S_RUN) {
                        arn_rate_ctl_start(sc, in);
                } else {
                        arn_rate_update(sc, in, 0);
                }
#else
                if (state == IEEE80211_S_RUN)
                        arn_rate_init(sc, in);
#endif
        /* LINTED E_NOP_ELSE_STMT */
        } else {
                /*
                 * When operating as a station the node table holds
                 * the AP's that were discovered during scanning.
                 * For any other operating mode we want to reset the
                 * tx rate state of each node.
                 */
#ifdef ARN_LEGACY_RC
                ieee80211_iterate_nodes(&ic->ic_sta, arn_rate_cb, sc);
#endif
        }
}

#ifdef ARN_LEGACY_RC
/*
 * Examine and potentially adjust the transmit rate.
 */
void
arn_rate_ctl(void *arg, struct ieee80211_node *in)
{
        struct arn_softc *sc = arg;
        struct ath_node *an = ATH_NODE(in);
        struct ieee80211_rateset *rs = &in->in_rates;
        int32_t mod = 0, nrate, enough;

        /*
         * Rate control(very primitive version).
         */
        sc->sc_stats.ast_rate_calls++;

        enough = (an->an_tx_ok + an->an_tx_err >= 10);

        /* no packet reached -> down */
        if (an->an_tx_err > 0 && an->an_tx_ok == 0)
                mod = -1;

        /* all packets needs retry in average -> down */
        if (enough && an->an_tx_ok < an->an_tx_retr)
                mod = -1;

        /* no error and less than 10% of packets needs retry -> up */
        if (enough && an->an_tx_err == 0 && an->an_tx_ok > an->an_tx_retr * 10)
                mod = 1;

        nrate = in->in_txrate;
        switch (mod) {
        case 0:
                if (enough && an->an_tx_upper > 0)
                        an->an_tx_upper--;
                break;
        case -1:
                if (nrate > 0) {
                        nrate--;
                        sc->sc_stats.ast_rate_drop++;
                }
                an->an_tx_upper = 0;
                break;
        case 1:
                if (++an->an_tx_upper < 10)
                        break;
                an->an_tx_upper = 0;
                if (nrate + 1 < rs->ir_nrates) {
                        nrate++;
                        sc->sc_stats.ast_rate_raise++;
                }
                break;
        }

        if (nrate != in->in_txrate) {
                ARN_DBG((ARN_DBG_RATE, "arn: arn_rate_ctl(): %dM -> %dM "
                    "(%d ok, %d err, %d retr)\n",
                    (rs->ir_rates[in->in_txrate] & IEEE80211_RATE_VAL) / 2,
                    (rs->ir_rates[nrate] & IEEE80211_RATE_VAL) / 2,
                    an->an_tx_ok, an->an_tx_err, an->an_tx_retr));
                arn_rate_update(sc, in, nrate);
        } else if (enough)
                an->an_tx_ok = an->an_tx_err = an->an_tx_retr = 0;
}
#endif /* ARN_LEGACY_RC */