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8fe723117a
linux/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
Wey-Yi Guy 8fe723117a iwlwifi: HT performance improvement changes 
During rate scaling, checking for 0 retry count before decrement
the count by 1, this can avoid the retry count to become 255 (0xff),
which will cause the rate to drop faster than what we expect during good
condition (receive 0 retry packet). also change the algorithm to make
the rate not drop faster than what we like.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-03-16 18:09:44 -04:00

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/******************************************************************************
*
* Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#ifndef __iwl_agn_rs_h__
#define __iwl_agn_rs_h__
struct iwl_rate_info {
u8 plcp; /* uCode API: IWL_RATE_6M_PLCP, etc. */
u8 plcp_siso; /* uCode API: IWL_RATE_SISO_6M_PLCP, etc. */
u8 plcp_mimo2; /* uCode API: IWL_RATE_MIMO2_6M_PLCP, etc. */
u8 plcp_mimo3; /* uCode API: IWL_RATE_MIMO3_6M_PLCP, etc. */
u8 ieee; /* MAC header: IWL_RATE_6M_IEEE, etc. */
u8 prev_ieee; /* previous rate in IEEE speeds */
u8 next_ieee; /* next rate in IEEE speeds */
u8 prev_rs; /* previous rate used in rs algo */
u8 next_rs; /* next rate used in rs algo */
u8 prev_rs_tgg; /* previous rate used in TGG rs algo */
u8 next_rs_tgg; /* next rate used in TGG rs algo */
};
struct iwl3945_rate_info {
u8 plcp; /* uCode API: IWL_RATE_6M_PLCP, etc. */
u8 ieee; /* MAC header: IWL_RATE_6M_IEEE, etc. */
u8 prev_ieee; /* previous rate in IEEE speeds */
u8 next_ieee; /* next rate in IEEE speeds */
u8 prev_rs; /* previous rate used in rs algo */
u8 next_rs; /* next rate used in rs algo */
u8 prev_rs_tgg; /* previous rate used in TGG rs algo */
u8 next_rs_tgg; /* next rate used in TGG rs algo */
u8 table_rs_index; /* index in rate scale table cmd */
u8 prev_table_rs; /* prev in rate table cmd */
};
/*
* These serve as indexes into
* struct iwl_rate_info iwl_rates[IWL_RATE_COUNT];
*/
enum {
IWL_RATE_1M_INDEX = 0,
IWL_RATE_2M_INDEX,
IWL_RATE_5M_INDEX,
IWL_RATE_11M_INDEX,
IWL_RATE_6M_INDEX,
IWL_RATE_9M_INDEX,
IWL_RATE_12M_INDEX,
IWL_RATE_18M_INDEX,
IWL_RATE_24M_INDEX,
IWL_RATE_36M_INDEX,
IWL_RATE_48M_INDEX,
IWL_RATE_54M_INDEX,
IWL_RATE_60M_INDEX,
IWL_RATE_COUNT, /*FIXME:RS:change to IWL_RATE_INDEX_COUNT,*/
IWL_RATE_COUNT_3945 = IWL_RATE_COUNT - 1,
IWL_RATE_INVM_INDEX = IWL_RATE_COUNT,
IWL_RATE_INVALID = IWL_RATE_COUNT,
};
enum {
IWL_RATE_6M_INDEX_TABLE = 0,
IWL_RATE_9M_INDEX_TABLE,
IWL_RATE_12M_INDEX_TABLE,
IWL_RATE_18M_INDEX_TABLE,
IWL_RATE_24M_INDEX_TABLE,
IWL_RATE_36M_INDEX_TABLE,
IWL_RATE_48M_INDEX_TABLE,
IWL_RATE_54M_INDEX_TABLE,
IWL_RATE_1M_INDEX_TABLE,
IWL_RATE_2M_INDEX_TABLE,
IWL_RATE_5M_INDEX_TABLE,
IWL_RATE_11M_INDEX_TABLE,
IWL_RATE_INVM_INDEX_TABLE = IWL_RATE_INVM_INDEX - 1,
};
enum {
IWL_FIRST_OFDM_RATE = IWL_RATE_6M_INDEX,
IWL39_LAST_OFDM_RATE = IWL_RATE_54M_INDEX,
IWL_LAST_OFDM_RATE = IWL_RATE_60M_INDEX,
IWL_FIRST_CCK_RATE = IWL_RATE_1M_INDEX,
IWL_LAST_CCK_RATE = IWL_RATE_11M_INDEX,
};
/* #define vs. enum to keep from defaulting to 'large integer' */
#define IWL_RATE_6M_MASK (1 << IWL_RATE_6M_INDEX)
#define IWL_RATE_9M_MASK (1 << IWL_RATE_9M_INDEX)
#define IWL_RATE_12M_MASK (1 << IWL_RATE_12M_INDEX)
#define IWL_RATE_18M_MASK (1 << IWL_RATE_18M_INDEX)
#define IWL_RATE_24M_MASK (1 << IWL_RATE_24M_INDEX)
#define IWL_RATE_36M_MASK (1 << IWL_RATE_36M_INDEX)
#define IWL_RATE_48M_MASK (1 << IWL_RATE_48M_INDEX)
#define IWL_RATE_54M_MASK (1 << IWL_RATE_54M_INDEX)
#define IWL_RATE_60M_MASK (1 << IWL_RATE_60M_INDEX)
#define IWL_RATE_1M_MASK (1 << IWL_RATE_1M_INDEX)
#define IWL_RATE_2M_MASK (1 << IWL_RATE_2M_INDEX)
#define IWL_RATE_5M_MASK (1 << IWL_RATE_5M_INDEX)
#define IWL_RATE_11M_MASK (1 << IWL_RATE_11M_INDEX)
/* uCode API values for legacy bit rates, both OFDM and CCK */
enum {
IWL_RATE_6M_PLCP = 13,
IWL_RATE_9M_PLCP = 15,
IWL_RATE_12M_PLCP = 5,
IWL_RATE_18M_PLCP = 7,
IWL_RATE_24M_PLCP = 9,
IWL_RATE_36M_PLCP = 11,
IWL_RATE_48M_PLCP = 1,
IWL_RATE_54M_PLCP = 3,
IWL_RATE_60M_PLCP = 3,/*FIXME:RS:should be removed*/
IWL_RATE_1M_PLCP = 10,
IWL_RATE_2M_PLCP = 20,
IWL_RATE_5M_PLCP = 55,
IWL_RATE_11M_PLCP = 110,
/*FIXME:RS:change to IWL_RATE_LEGACY_??M_PLCP */
/*FIXME:RS:add IWL_RATE_LEGACY_INVM_PLCP = 0,*/
};
/* uCode API values for OFDM high-throughput (HT) bit rates */
enum {
IWL_RATE_SISO_6M_PLCP = 0,
IWL_RATE_SISO_12M_PLCP = 1,
IWL_RATE_SISO_18M_PLCP = 2,
IWL_RATE_SISO_24M_PLCP = 3,
IWL_RATE_SISO_36M_PLCP = 4,
IWL_RATE_SISO_48M_PLCP = 5,
IWL_RATE_SISO_54M_PLCP = 6,
IWL_RATE_SISO_60M_PLCP = 7,
IWL_RATE_MIMO2_6M_PLCP = 0x8,
IWL_RATE_MIMO2_12M_PLCP = 0x9,
IWL_RATE_MIMO2_18M_PLCP = 0xa,
IWL_RATE_MIMO2_24M_PLCP = 0xb,
IWL_RATE_MIMO2_36M_PLCP = 0xc,
IWL_RATE_MIMO2_48M_PLCP = 0xd,
IWL_RATE_MIMO2_54M_PLCP = 0xe,
IWL_RATE_MIMO2_60M_PLCP = 0xf,
IWL_RATE_MIMO3_6M_PLCP = 0x10,
IWL_RATE_MIMO3_12M_PLCP = 0x11,
IWL_RATE_MIMO3_18M_PLCP = 0x12,
IWL_RATE_MIMO3_24M_PLCP = 0x13,
IWL_RATE_MIMO3_36M_PLCP = 0x14,
IWL_RATE_MIMO3_48M_PLCP = 0x15,
IWL_RATE_MIMO3_54M_PLCP = 0x16,
IWL_RATE_MIMO3_60M_PLCP = 0x17,
IWL_RATE_SISO_INVM_PLCP,
IWL_RATE_MIMO2_INVM_PLCP = IWL_RATE_SISO_INVM_PLCP,
IWL_RATE_MIMO3_INVM_PLCP = IWL_RATE_SISO_INVM_PLCP,
};
/* MAC header values for bit rates */
enum {
IWL_RATE_6M_IEEE = 12,
IWL_RATE_9M_IEEE = 18,
IWL_RATE_12M_IEEE = 24,
IWL_RATE_18M_IEEE = 36,
IWL_RATE_24M_IEEE = 48,
IWL_RATE_36M_IEEE = 72,
IWL_RATE_48M_IEEE = 96,
IWL_RATE_54M_IEEE = 108,
IWL_RATE_60M_IEEE = 120,
IWL_RATE_1M_IEEE = 2,
IWL_RATE_2M_IEEE = 4,
IWL_RATE_5M_IEEE = 11,
IWL_RATE_11M_IEEE = 22,
};
#define IWL_CCK_BASIC_RATES_MASK \
(IWL_RATE_1M_MASK | \
IWL_RATE_2M_MASK)
#define IWL_CCK_RATES_MASK \
(IWL_BASIC_RATES_MASK | \
IWL_RATE_5M_MASK | \
IWL_RATE_11M_MASK)
#define IWL_OFDM_BASIC_RATES_MASK \
(IWL_RATE_6M_MASK | \
IWL_RATE_12M_MASK | \
IWL_RATE_24M_MASK)
#define IWL_OFDM_RATES_MASK \
(IWL_OFDM_BASIC_RATES_MASK | \
IWL_RATE_9M_MASK | \
IWL_RATE_18M_MASK | \
IWL_RATE_36M_MASK | \
IWL_RATE_48M_MASK | \
IWL_RATE_54M_MASK)
#define IWL_BASIC_RATES_MASK \
(IWL_OFDM_BASIC_RATES_MASK | \
IWL_CCK_BASIC_RATES_MASK)
#define IWL_RATES_MASK ((1 << IWL_RATE_COUNT) - 1)
#define IWL_INVALID_VALUE -1
#define IWL_MIN_RSSI_VAL -100
#define IWL_MAX_RSSI_VAL 0
/* These values specify how many Tx frame attempts before
* searching for a new modulation mode */
#define IWL_LEGACY_FAILURE_LIMIT 160
#define IWL_LEGACY_SUCCESS_LIMIT 480
#define IWL_LEGACY_TABLE_COUNT 160
#define IWL_NONE_LEGACY_FAILURE_LIMIT 400
#define IWL_NONE_LEGACY_SUCCESS_LIMIT 4500
#define IWL_NONE_LEGACY_TABLE_COUNT 1500
/* Success ratio (ACKed / attempted tx frames) values (perfect is 128 * 100) */
#define IWL_RS_GOOD_RATIO 12800 /* 100% */
#define IWL_RATE_SCALE_SWITCH 10880 /* 85% */
#define IWL_RATE_HIGH_TH 10880 /* 85% */
#define IWL_RATE_INCREASE_TH 6400 /* 50% */
#define IWL_RATE_DECREASE_TH 1920 /* 15% */
/* possible actions when in legacy mode */
#define IWL_LEGACY_SWITCH_ANTENNA1 0
#define IWL_LEGACY_SWITCH_ANTENNA2 1
#define IWL_LEGACY_SWITCH_SISO 2
#define IWL_LEGACY_SWITCH_MIMO2_AB 3
#define IWL_LEGACY_SWITCH_MIMO2_AC 4
#define IWL_LEGACY_SWITCH_MIMO2_BC 5
/* possible actions when in siso mode */
#define IWL_SISO_SWITCH_ANTENNA1 0
#define IWL_SISO_SWITCH_ANTENNA2 1
#define IWL_SISO_SWITCH_MIMO2_AB 2
#define IWL_SISO_SWITCH_MIMO2_AC 3
#define IWL_SISO_SWITCH_MIMO2_BC 4
#define IWL_SISO_SWITCH_GI 5
/* possible actions when in mimo mode */
#define IWL_MIMO2_SWITCH_ANTENNA1 0
#define IWL_MIMO2_SWITCH_ANTENNA2 1
#define IWL_MIMO2_SWITCH_SISO_A 2
#define IWL_MIMO2_SWITCH_SISO_B 3
#define IWL_MIMO2_SWITCH_SISO_C 4
#define IWL_MIMO2_SWITCH_GI 5
/*FIXME:RS:add possible actions for MIMO3*/
#define IWL_ACTION_LIMIT 3 /* # possible actions */
#define LQ_SIZE 2 /* 2 mode tables: "Active" and "Search" */
/* load per tid defines for A-MPDU activation */
#define IWL_AGG_TPT_THREHOLD 0
#define IWL_AGG_LOAD_THRESHOLD 10
#define IWL_AGG_ALL_TID 0xff
#define TID_QUEUE_CELL_SPACING 50 /*mS */
#define TID_QUEUE_MAX_SIZE 20
#define TID_ROUND_VALUE 5 /* mS */
#define TID_MAX_LOAD_COUNT 8
#define TID_MAX_TIME_DIFF ((TID_QUEUE_MAX_SIZE - 1) * TID_QUEUE_CELL_SPACING)
#define TIME_WRAP_AROUND(x, y) (((y) > (x)) ? (y) - (x) : (0-(x)) + (y))
extern const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT];
extern const struct iwl3945_rate_info iwl3945_rates[IWL_RATE_COUNT_3945];
enum iwl_table_type {
LQ_NONE,
LQ_G, /* legacy types */
LQ_A,
LQ_SISO, /* high-throughput types */
LQ_MIMO2,
LQ_MIMO3,
LQ_MAX,
};
#define is_legacy(tbl) (((tbl) == LQ_G) || ((tbl) == LQ_A))
#define is_siso(tbl) ((tbl) == LQ_SISO)
#define is_mimo2(tbl) ((tbl) == LQ_MIMO2)
#define is_mimo3(tbl) ((tbl) == LQ_MIMO3)
#define is_mimo(tbl) (is_mimo2(tbl) || is_mimo3(tbl))
#define is_Ht(tbl) (is_siso(tbl) || is_mimo(tbl))
#define is_a_band(tbl) ((tbl) == LQ_A)
#define is_g_and(tbl) ((tbl) == LQ_G)
#define ANT_NONE 0x0
#define ANT_A BIT(0)
#define ANT_B BIT(1)
#define ANT_AB (ANT_A | ANT_B)
#define ANT_C BIT(2)
#define ANT_AC (ANT_A | ANT_C)
#define ANT_BC (ANT_B | ANT_C)
#define ANT_ABC (ANT_AB | ANT_C)
static inline u8 num_of_ant(u8 mask)
{
return !!((mask) & ANT_A) +
!!((mask) & ANT_B) +
!!((mask) & ANT_C);
}
static inline u8 first_antenna(u8 mask)
{
if (mask & ANT_A)
return ANT_A;
if (mask & ANT_B)
return ANT_B;
return ANT_C;
}
static inline u8 iwl_get_prev_ieee_rate(u8 rate_index)
{
u8 rate = iwl_rates[rate_index].prev_ieee;
if (rate == IWL_RATE_INVALID)
rate = rate_index;
return rate;
}
static inline u8 iwl3945_get_prev_ieee_rate(u8 rate_index)
{
u8 rate = iwl3945_rates[rate_index].prev_ieee;
if (rate == IWL_RATE_INVALID)
rate = rate_index;
return rate;
}
/**
* iwl3945_rate_scale_init - Initialize the rate scale table based on assoc info
*
* The specific throughput table used is based on the type of network
* the associated with, including A, B, G, and G w/ TGG protection
*/
extern void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id);
/**
* iwl_rate_control_register - Register the rate control algorithm callbacks
*
* Since the rate control algorithm is hardware specific, there is no need
* or reason to place it as a stand alone module. The driver can call
* iwl_rate_control_register in order to register the rate control callbacks
* with the mac80211 subsystem. This should be performed prior to calling
* ieee80211_register_hw
*
*/
extern int iwlagn_rate_control_register(void);
extern int iwl3945_rate_control_register(void);
/**
* iwl_rate_control_unregister - Unregister the rate control callbacks
*
* This should be called after calling ieee80211_unregister_hw, but before
* the driver is unloaded.
*/
extern void iwlagn_rate_control_unregister(void);
extern void iwl3945_rate_control_unregister(void);
#endif /* __iwl_agn__rs__ */
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