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* Copyright (c) 2010 Broadcom Corporation
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <proto/802.11.h>
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#include "wlc_types.h"
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/* Rate info per rate: It tells whether a rate is ofdm or not and its phy_rate value */
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const u8 rate_info[WLC_MAXRATE + 1] = {
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/* 0 1 2 3 4 5 6 7 8 9 */
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/* 0 */ 0x00, 0x00, 0x0a, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 10 */ 0x00, 0x37, 0x8b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8f, 0x00,
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/* 20 */ 0x00, 0x00, 0x6e, 0x00, 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8e, 0x00, 0x00, 0x00,
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/* 40 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x89, 0x00,
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/* 50 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 60 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 70 */ 0x00, 0x00, 0x8d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 80 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 90 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x00, 0x00, 0x00,
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/* 100 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8c
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/* rates are in units of Kbps */
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const mcs_info_t mcs_table[MCS_TABLE_SIZE] = {
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/* MCS 0: SS 1, MOD: BPSK, CR 1/2 */
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{6500, 13500, CEIL(6500 * 10, 9), CEIL(13500 * 10, 9), 0x00,
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/* MCS 1: SS 1, MOD: QPSK, CR 1/2 */
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{13000, 27000, CEIL(13000 * 10, 9), CEIL(27000 * 10, 9), 0x08,
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/* MCS 2: SS 1, MOD: QPSK, CR 3/4 */
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{19500, 40500, CEIL(19500 * 10, 9), CEIL(40500 * 10, 9), 0x0A,
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/* MCS 3: SS 1, MOD: 16QAM, CR 1/2 */
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{26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0x10,
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/* MCS 4: SS 1, MOD: 16QAM, CR 3/4 */
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{39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x12,
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/* MCS 5: SS 1, MOD: 64QAM, CR 2/3 */
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{52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0x19,
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/* MCS 6: SS 1, MOD: 64QAM, CR 3/4 */
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{58500, 121500, CEIL(58500 * 10, 9), CEIL(121500 * 10, 9), 0x1A,
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/* MCS 7: SS 1, MOD: 64QAM, CR 5/6 */
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{65000, 135000, CEIL(65000 * 10, 9), CEIL(135000 * 10, 9), 0x1C,
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/* MCS 8: SS 2, MOD: BPSK, CR 1/2 */
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{13000, 27000, CEIL(13000 * 10, 9), CEIL(27000 * 10, 9), 0x40,
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/* MCS 9: SS 2, MOD: QPSK, CR 1/2 */
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{26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0x48,
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/* MCS 10: SS 2, MOD: QPSK, CR 3/4 */
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{39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x4A,
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/* MCS 11: SS 2, MOD: 16QAM, CR 1/2 */
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{52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0x50,
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/* MCS 12: SS 2, MOD: 16QAM, CR 3/4 */
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{78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0x52,
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/* MCS 13: SS 2, MOD: 64QAM, CR 2/3 */
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{104000, 216000, CEIL(104000 * 10, 9), CEIL(216000 * 10, 9), 0x59,
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/* MCS 14: SS 2, MOD: 64QAM, CR 3/4 */
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{117000, 243000, CEIL(117000 * 10, 9), CEIL(243000 * 10, 9), 0x5A,
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/* MCS 15: SS 2, MOD: 64QAM, CR 5/6 */
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{130000, 270000, CEIL(130000 * 10, 9), CEIL(270000 * 10, 9), 0x5C,
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/* MCS 16: SS 3, MOD: BPSK, CR 1/2 */
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{19500, 40500, CEIL(19500 * 10, 9), CEIL(40500 * 10, 9), 0x80,
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/* MCS 17: SS 3, MOD: QPSK, CR 1/2 */
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{39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x88,
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/* MCS 18: SS 3, MOD: QPSK, CR 3/4 */
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{58500, 121500, CEIL(58500 * 10, 9), CEIL(121500 * 10, 9), 0x8A,
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/* MCS 19: SS 3, MOD: 16QAM, CR 1/2 */
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{78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0x90,
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/* MCS 20: SS 3, MOD: 16QAM, CR 3/4 */
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{117000, 243000, CEIL(117000 * 10, 9), CEIL(243000 * 10, 9), 0x92,
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/* MCS 21: SS 3, MOD: 64QAM, CR 2/3 */
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{156000, 324000, CEIL(156000 * 10, 9), CEIL(324000 * 10, 9), 0x99,
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/* MCS 22: SS 3, MOD: 64QAM, CR 3/4 */
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{175500, 364500, CEIL(175500 * 10, 9), CEIL(364500 * 10, 9), 0x9A,
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/* MCS 23: SS 3, MOD: 64QAM, CR 5/6 */
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{195000, 405000, CEIL(195000 * 10, 9), CEIL(405000 * 10, 9), 0x9B,
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/* MCS 24: SS 4, MOD: BPSK, CR 1/2 */
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{26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0xC0,
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/* MCS 25: SS 4, MOD: QPSK, CR 1/2 */
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{52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0xC8,
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/* MCS 26: SS 4, MOD: QPSK, CR 3/4 */
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{78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0xCA,
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/* MCS 27: SS 4, MOD: 16QAM, CR 1/2 */
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{104000, 216000, CEIL(104000 * 10, 9), CEIL(216000 * 10, 9), 0xD0,
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/* MCS 28: SS 4, MOD: 16QAM, CR 3/4 */
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{156000, 324000, CEIL(156000 * 10, 9), CEIL(324000 * 10, 9), 0xD2,
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/* MCS 29: SS 4, MOD: 64QAM, CR 2/3 */
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{208000, 432000, CEIL(208000 * 10, 9), CEIL(432000 * 10, 9), 0xD9,
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/* MCS 30: SS 4, MOD: 64QAM, CR 3/4 */
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{234000, 486000, CEIL(234000 * 10, 9), CEIL(486000 * 10, 9), 0xDA,
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/* MCS 31: SS 4, MOD: 64QAM, CR 5/6 */
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{260000, 540000, CEIL(260000 * 10, 9), CEIL(540000 * 10, 9), 0xDB,
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/* MCS 32: SS 1, MOD: BPSK, CR 1/2 */
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{0, 6000, 0, CEIL(6000 * 10, 9), 0x00, WLC_RATE_6M},
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/* phycfg for legacy OFDM frames: code rate, modulation scheme, spatial streams
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* Number of spatial streams: always 1
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* other fields: refer to table 78 of section 17.3.2.2 of the original .11a standard
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typedef struct legacy_phycfg {
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u32 rate_ofdm; /* ofdm mac rate */
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u8 tx_phy_ctl3; /* phy ctl byte 3, code rate, modulation type, # of streams */
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#define LEGACY_PHYCFG_TABLE_SIZE 12 /* Number of legacy_rate_cfg entries in the table */
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/* In CCK mode LPPHY overloads OFDM Modulation bits with CCK Data Rate */
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/* Eventually MIMOPHY would also be converted to this format */
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/* 0 = 1Mbps; 1 = 2Mbps; 2 = 5.5Mbps; 3 = 11Mbps */
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static const legacy_phycfg_t legacy_phycfg_table[LEGACY_PHYCFG_TABLE_SIZE] = {
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{WLC_RATE_1M, 0x00}, /* CCK 1Mbps, data rate 0 */
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{WLC_RATE_2M, 0x08}, /* CCK 2Mbps, data rate 1 */
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{WLC_RATE_5M5, 0x10}, /* CCK 5.5Mbps, data rate 2 */
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{WLC_RATE_11M, 0x18}, /* CCK 11Mbps, data rate 3 */
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{WLC_RATE_6M, 0x00}, /* OFDM 6Mbps, code rate 1/2, BPSK, 1 spatial stream */
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{WLC_RATE_9M, 0x02}, /* OFDM 9Mbps, code rate 3/4, BPSK, 1 spatial stream */
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{WLC_RATE_12M, 0x08}, /* OFDM 12Mbps, code rate 1/2, QPSK, 1 spatial stream */
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{WLC_RATE_18M, 0x0A}, /* OFDM 18Mbps, code rate 3/4, QPSK, 1 spatial stream */
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{WLC_RATE_24M, 0x10}, /* OFDM 24Mbps, code rate 1/2, 16-QAM, 1 spatial stream */
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{WLC_RATE_36M, 0x12}, /* OFDM 36Mbps, code rate 3/4, 16-QAM, 1 spatial stream */
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{WLC_RATE_48M, 0x19}, /* OFDM 48Mbps, code rate 2/3, 64-QAM, 1 spatial stream */
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{WLC_RATE_54M, 0x1A}, /* OFDM 54Mbps, code rate 3/4, 64-QAM, 1 spatial stream */
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/* Hardware rates (also encodes default basic rates) */
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const wlc_rateset_t cck_ofdm_mimo_rates = {
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{ /* 1b, 2b, 5.5b, 6, 9, 11b, 12, 18, 24, 36, 48, 54 Mbps */
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0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
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{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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const wlc_rateset_t ofdm_mimo_rates = {
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{ /* 6b, 9, 12b, 18, 24b, 36, 48, 54 Mbps */
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0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
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{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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/* Default ratesets that include MCS32 for 40BW channels */
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const wlc_rateset_t cck_ofdm_40bw_mimo_rates = {
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{ /* 1b, 2b, 5.5b, 6, 9, 11b, 12, 18, 24, 36, 48, 54 Mbps */
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0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
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{0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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const wlc_rateset_t ofdm_40bw_mimo_rates = {
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{ /* 6b, 9, 12b, 18, 24b, 36, 48, 54 Mbps */
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0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
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{0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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const wlc_rateset_t cck_ofdm_rates = {
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{ /* 1b, 2b, 5.5b, 6, 9, 11b, 12, 18, 24, 36, 48, 54 Mbps */
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0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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const wlc_rateset_t gphy_legacy_rates = {
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{ /* 1b, 2b, 5.5b, 11b Mbps */
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0x82, 0x84, 0x8b, 0x96},
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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const wlc_rateset_t ofdm_rates = {
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{ /* 6b, 9, 12b, 18, 24b, 36, 48, 54 Mbps */
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0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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const wlc_rateset_t cck_rates = {
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{ /* 1b, 2b, 5.5, 11 Mbps */
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0x82, 0x84, 0x0b, 0x16},
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00}
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static bool wlc_rateset_valid(wlc_rateset_t *rs, bool check_brate);
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/* check if rateset is valid.
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* if check_brate is true, rateset without a basic rate is considered NOT valid.
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static bool wlc_rateset_valid(wlc_rateset_t *rs, bool check_brate)
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/* error if no basic rates */
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for (idx = 0; idx < rs->count; idx++) {
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if (rs->rates[idx] & WLC_RATE_FLAG)
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void wlc_rateset_mcs_upd(wlc_rateset_t *rs, u8 txstreams)
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for (i = txstreams; i < MAX_STREAMS_SUPPORTED; i++)
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/* filter based on hardware rateset, and sort filtered rateset with basic bit(s) preserved,
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* and check if resulting rateset is valid.
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wlc_rate_hwrs_filter_sort_validate(wlc_rateset_t *rs,
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const wlc_rateset_t *hw_rs,
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bool check_brate, u8 txstreams)
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u8 rateset[WLC_MAXRATE + 1];
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memset(rateset, 0, sizeof(rateset));
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for (i = 0; i < count; i++) {
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/* mask off "basic rate" bit, WLC_RATE_FLAG */
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r = (int)rs->rates[i] & WLC_RATE_MASK;
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if ((r > WLC_MAXRATE) || (rate_info[r] == 0)) {
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rateset[r] = rs->rates[i]; /* preserve basic bit! */
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/* fill out the rates in order, looking at only supported rates */
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for (i = 0; i < hw_rs->count; i++) {
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r = hw_rs->rates[i] & WLC_RATE_MASK;
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rs->rates[count++] = rateset[r];
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/* only set the mcs rate bit if the equivalent hw mcs bit is set */
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for (i = 0; i < MCSSET_LEN; i++)
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rs->mcs[i] = (rs->mcs[i] & hw_rs->mcs[i]);
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if (wlc_rateset_valid(rs, check_brate))
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/* calculate the rate of a rx'd frame and return it as a ratespec */
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ratespec_t wlc_compute_rspec(d11rxhdr_t *rxh, u8 *plcp)
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ratespec_t rspec = PHY_TXC1_BW_20MHZ << RSPEC_BW_SHIFT;
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((rxh->RxChan & RXS_CHAN_PHYTYPE_MASK) >> RXS_CHAN_PHYTYPE_SHIFT);
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if ((phy_type == PHY_TYPE_N) || (phy_type == PHY_TYPE_SSN) ||
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(phy_type == PHY_TYPE_LCN) || (phy_type == PHY_TYPE_HT)) {
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switch (rxh->PhyRxStatus_0 & PRXS0_FT_MASK) {
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CCK_PHY2MAC_RATE(((cck_phy_hdr_t *) plcp)->signal);
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OFDM_PHY2MAC_RATE(((ofdm_phy_hdr_t *) plcp)->
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rspec = (plcp[0] & MIMO_PLCP_MCS_MASK) | RSPEC_MIMORATE;
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if (plcp[0] & MIMO_PLCP_40MHZ) {
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/* indicate rspec is for 40 MHz mode */
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rspec &= ~RSPEC_BW_MASK;
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rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT);
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/* not supported, error condition */
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if (PLCP3_ISSGI(plcp[3]))
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rspec |= RSPEC_SHORT_GI;
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if ((phy_type == PHY_TYPE_A) || (rxh->PhyRxStatus_0 & PRXS0_OFDM))
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rspec = OFDM_PHY2MAC_RATE(((ofdm_phy_hdr_t *) plcp)->rlpt[0]);
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rspec = CCK_PHY2MAC_RATE(((cck_phy_hdr_t *) plcp)->signal);
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/* copy rateset src to dst as-is (no masking or sorting) */
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void wlc_rateset_copy(const wlc_rateset_t *src, wlc_rateset_t *dst)
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memcpy(dst, src, sizeof(wlc_rateset_t));
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* Copy and selectively filter one rateset to another.
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* 'basic_only' means only copy basic rates.
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* 'rates' indicates cck (11b) and ofdm rates combinations.
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* 'xmask' is the copy mask (typically 0x7f or 0xff).
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wlc_rateset_filter(wlc_rateset_t *src, wlc_rateset_t *dst, bool basic_only,
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u8 rates, uint xmask, bool mcsallow)
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for (i = 0; i < src->count; i++) {
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if (basic_only && !(r & WLC_RATE_FLAG))
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if ((rates == WLC_RATES_CCK) && IS_OFDM((r & WLC_RATE_MASK)))
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if ((rates == WLC_RATES_OFDM) && IS_CCK((r & WLC_RATE_MASK)))
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dst->rates[count++] = r & xmask;
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dst->htphy_membership = src->htphy_membership;
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if (mcsallow && rates != WLC_RATES_CCK)
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memcpy(&dst->mcs[0], &src->mcs[0], MCSSET_LEN);
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wlc_rateset_mcs_clear(dst);
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/* select rateset for a given phy_type and bandtype and filter it, sort it
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* and fill rs_tgt with result
427
wlc_rateset_default(wlc_rateset_t *rs_tgt, const wlc_rateset_t *rs_hw,
428
uint phy_type, int bandtype, bool cck_only, uint rate_mask,
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bool mcsallow, u8 bw, u8 txstreams)
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const wlc_rateset_t *rs_dflt;
432
wlc_rateset_t rs_sel;
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if ((PHYTYPE_IS(phy_type, PHY_TYPE_HT)) ||
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(PHYTYPE_IS(phy_type, PHY_TYPE_N)) ||
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(PHYTYPE_IS(phy_type, PHY_TYPE_LCN)) ||
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(PHYTYPE_IS(phy_type, PHY_TYPE_SSN))) {
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if (BAND_5G(bandtype)) {
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rs_dflt = (bw == WLC_20_MHZ ?
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&ofdm_mimo_rates : &ofdm_40bw_mimo_rates);
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rs_dflt = (bw == WLC_20_MHZ ?
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&cck_ofdm_mimo_rates :
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&cck_ofdm_40bw_mimo_rates);
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} else if (PHYTYPE_IS(phy_type, PHY_TYPE_LP)) {
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rs_dflt = (BAND_5G(bandtype)) ? &ofdm_rates : &cck_ofdm_rates;
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} else if (PHYTYPE_IS(phy_type, PHY_TYPE_A)) {
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rs_dflt = &ofdm_rates;
449
} else if (PHYTYPE_IS(phy_type, PHY_TYPE_G)) {
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rs_dflt = &cck_ofdm_rates;
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/* should not happen, error condition */
453
rs_dflt = &cck_rates; /* force cck */
456
/* if hw rateset is not supplied, assign selected rateset to it */
460
wlc_rateset_copy(rs_dflt, &rs_sel);
461
wlc_rateset_mcs_upd(&rs_sel, txstreams);
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wlc_rateset_filter(&rs_sel, rs_tgt, false,
463
cck_only ? WLC_RATES_CCK : WLC_RATES_CCK_OFDM,
464
rate_mask, mcsallow);
465
wlc_rate_hwrs_filter_sort_validate(rs_tgt, rs_hw, false,
466
mcsallow ? txstreams : 1);
469
s16 wlc_rate_legacy_phyctl(uint rate)
472
for (i = 0; i < LEGACY_PHYCFG_TABLE_SIZE; i++)
473
if (rate == legacy_phycfg_table[i].rate_ofdm)
474
return legacy_phycfg_table[i].tx_phy_ctl3;
479
void wlc_rateset_mcs_clear(wlc_rateset_t *rateset)
482
for (i = 0; i < MCSSET_LEN; i++)
486
void wlc_rateset_mcs_build(wlc_rateset_t *rateset, u8 txstreams)
488
memcpy(&rateset->mcs[0], &cck_ofdm_mimo_rates.mcs[0], MCSSET_LEN);
489
wlc_rateset_mcs_upd(rateset, txstreams);
492
/* Based on bandwidth passed, allow/disallow MCS 32 in the rateset */
493
void wlc_rateset_bw_mcs_filter(wlc_rateset_t *rateset, u8 bw)
495
if (bw == WLC_40_MHZ)
496
setbit(rateset->mcs, 32);
498
clrbit(rateset->mcs, 32);