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linux/drivers/net/wireless/iwlwifi/mvm/rs.h
Eyal Shapira b503ed603e iwlwifi: mvm: rs: report last tx rate based on RSSI and caps 
In scenarios where we haven't converged yet to a specific modulation
and rate it could be better to report to userspace the last tx rate
based on the STA capabilities and RSSI. This is important as sometimes
userspace displays the last tx rate as the link speed.
This avoids being presented with low legacy rates when rs just begins
its search or after an idle period in which it resets itself.

Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
2015-06-26 09:00:24 +03:00

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/******************************************************************************
*
* Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2015 Intel Mobile Communications GmbH
*
* 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 __rs_h__
#define __rs_h__
#include <net/mac80211.h>
#include "iwl-config.h"
#include "fw-api.h"
#include "iwl-trans.h"
struct iwl_rs_rate_info {
u8 plcp; /* uCode API: IWL_RATE_6M_PLCP, etc. */
u8 plcp_ht_siso; /* uCode API: IWL_RATE_SISO_6M_PLCP, etc. */
u8 plcp_ht_mimo2; /* uCode API: IWL_RATE_MIMO2_6M_PLCP, etc. */
u8 plcp_vht_siso;
u8 plcp_vht_mimo2;
u8 prev_rs; /* previous rate used in rs algo */
u8 next_rs; /* next rate used in rs algo */
};
#define IWL_RATE_60M_PLCP 3
enum {
IWL_RATE_INVM_INDEX = IWL_RATE_COUNT,
IWL_RATE_INVALID = IWL_RATE_COUNT,
};
#define LINK_QUAL_MAX_RETRY_NUM 16
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,
};
/* #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 HT/VHT bit rates */
enum {
IWL_RATE_HT_SISO_MCS_0_PLCP = 0,
IWL_RATE_HT_SISO_MCS_1_PLCP = 1,
IWL_RATE_HT_SISO_MCS_2_PLCP = 2,
IWL_RATE_HT_SISO_MCS_3_PLCP = 3,
IWL_RATE_HT_SISO_MCS_4_PLCP = 4,
IWL_RATE_HT_SISO_MCS_5_PLCP = 5,
IWL_RATE_HT_SISO_MCS_6_PLCP = 6,
IWL_RATE_HT_SISO_MCS_7_PLCP = 7,
IWL_RATE_HT_MIMO2_MCS_0_PLCP = 0x8,
IWL_RATE_HT_MIMO2_MCS_1_PLCP = 0x9,
IWL_RATE_HT_MIMO2_MCS_2_PLCP = 0xA,
IWL_RATE_HT_MIMO2_MCS_3_PLCP = 0xB,
IWL_RATE_HT_MIMO2_MCS_4_PLCP = 0xC,
IWL_RATE_HT_MIMO2_MCS_5_PLCP = 0xD,
IWL_RATE_HT_MIMO2_MCS_6_PLCP = 0xE,
IWL_RATE_HT_MIMO2_MCS_7_PLCP = 0xF,
IWL_RATE_VHT_SISO_MCS_0_PLCP = 0,
IWL_RATE_VHT_SISO_MCS_1_PLCP = 1,
IWL_RATE_VHT_SISO_MCS_2_PLCP = 2,
IWL_RATE_VHT_SISO_MCS_3_PLCP = 3,
IWL_RATE_VHT_SISO_MCS_4_PLCP = 4,
IWL_RATE_VHT_SISO_MCS_5_PLCP = 5,
IWL_RATE_VHT_SISO_MCS_6_PLCP = 6,
IWL_RATE_VHT_SISO_MCS_7_PLCP = 7,
IWL_RATE_VHT_SISO_MCS_8_PLCP = 8,
IWL_RATE_VHT_SISO_MCS_9_PLCP = 9,
IWL_RATE_VHT_MIMO2_MCS_0_PLCP = 0x10,
IWL_RATE_VHT_MIMO2_MCS_1_PLCP = 0x11,
IWL_RATE_VHT_MIMO2_MCS_2_PLCP = 0x12,
IWL_RATE_VHT_MIMO2_MCS_3_PLCP = 0x13,
IWL_RATE_VHT_MIMO2_MCS_4_PLCP = 0x14,
IWL_RATE_VHT_MIMO2_MCS_5_PLCP = 0x15,
IWL_RATE_VHT_MIMO2_MCS_6_PLCP = 0x16,
IWL_RATE_VHT_MIMO2_MCS_7_PLCP = 0x17,
IWL_RATE_VHT_MIMO2_MCS_8_PLCP = 0x18,
IWL_RATE_VHT_MIMO2_MCS_9_PLCP = 0x19,
IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_HT_MIMO2_MCS_INV_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_VHT_SISO_MCS_INV_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_VHT_MIMO2_MCS_INV_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_HT_SISO_MCS_8_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_HT_SISO_MCS_9_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_HT_MIMO2_MCS_8_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
IWL_RATE_HT_MIMO2_MCS_9_PLCP = IWL_RATE_HT_SISO_MCS_INV_PLCP,
};
#define IWL_RATES_MASK ((1 << IWL_RATE_COUNT) - 1)
#define IWL_INVALID_VALUE -1
#define TPC_MAX_REDUCTION 15
#define TPC_NO_REDUCTION 0
#define TPC_INVALID 0xff
#define LINK_QUAL_AGG_FRAME_LIMIT_DEF (63)
#define LINK_QUAL_AGG_FRAME_LIMIT_MAX (63)
#define LINK_QUAL_AGG_FRAME_LIMIT_MIN (0)
#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_ALL_TID 0xff
enum iwl_table_type {
LQ_NONE,
LQ_LEGACY_G, /* legacy types */
LQ_LEGACY_A,
LQ_HT_SISO, /* HT types */
LQ_HT_MIMO2,
LQ_VHT_SISO, /* VHT types */
LQ_VHT_MIMO2,
LQ_MAX,
};
struct rs_rate {
int index;
enum iwl_table_type type;
u8 ant;
u32 bw;
bool sgi;
bool ldpc;
bool stbc;
bool bfer;
};
#define is_type_legacy(type) (((type) == LQ_LEGACY_G) || \
((type) == LQ_LEGACY_A))
#define is_type_ht_siso(type) ((type) == LQ_HT_SISO)
#define is_type_ht_mimo2(type) ((type) == LQ_HT_MIMO2)
#define is_type_vht_siso(type) ((type) == LQ_VHT_SISO)
#define is_type_vht_mimo2(type) ((type) == LQ_VHT_MIMO2)
#define is_type_siso(type) (is_type_ht_siso(type) || is_type_vht_siso(type))
#define is_type_mimo2(type) (is_type_ht_mimo2(type) || is_type_vht_mimo2(type))
#define is_type_mimo(type) (is_type_mimo2(type))
#define is_type_ht(type) (is_type_ht_siso(type) || is_type_ht_mimo2(type))
#define is_type_vht(type) (is_type_vht_siso(type) || is_type_vht_mimo2(type))
#define is_type_a_band(type) ((type) == LQ_LEGACY_A)
#define is_type_g_band(type) ((type) == LQ_LEGACY_G)
#define is_legacy(rate) is_type_legacy((rate)->type)
#define is_ht_siso(rate) is_type_ht_siso((rate)->type)
#define is_ht_mimo2(rate) is_type_ht_mimo2((rate)->type)
#define is_vht_siso(rate) is_type_vht_siso((rate)->type)
#define is_vht_mimo2(rate) is_type_vht_mimo2((rate)->type)
#define is_siso(rate) is_type_siso((rate)->type)
#define is_mimo2(rate) is_type_mimo2((rate)->type)
#define is_mimo(rate) is_type_mimo((rate)->type)
#define is_ht(rate) is_type_ht((rate)->type)
#define is_vht(rate) is_type_vht((rate)->type)
#define is_a_band(rate) is_type_a_band((rate)->type)
#define is_g_band(rate) is_type_g_band((rate)->type)
#define is_ht20(rate) ((rate)->bw == RATE_MCS_CHAN_WIDTH_20)
#define is_ht40(rate) ((rate)->bw == RATE_MCS_CHAN_WIDTH_40)
#define is_ht80(rate) ((rate)->bw == RATE_MCS_CHAN_WIDTH_80)
#define IWL_MAX_MCS_DISPLAY_SIZE 12
struct iwl_rate_mcs_info {
char mbps[IWL_MAX_MCS_DISPLAY_SIZE];
char mcs[IWL_MAX_MCS_DISPLAY_SIZE];
};
/**
* struct iwl_rate_scale_data -- tx success history for one rate
*/
struct iwl_rate_scale_data {
u64 data; /* bitmap of successful frames */
s32 success_counter; /* number of frames successful */
s32 success_ratio; /* per-cent * 128 */
s32 counter; /* number of frames attempted */
s32 average_tpt; /* success ratio * expected throughput */
};
/* Possible Tx columns
* Tx Column = a combo of legacy/siso/mimo x antenna x SGI
*/
enum rs_column {
RS_COLUMN_LEGACY_ANT_A = 0,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_SISO_ANT_A,
RS_COLUMN_SISO_ANT_B,
RS_COLUMN_SISO_ANT_A_SGI,
RS_COLUMN_SISO_ANT_B_SGI,
RS_COLUMN_MIMO2,
RS_COLUMN_MIMO2_SGI,
RS_COLUMN_LAST = RS_COLUMN_MIMO2_SGI,
RS_COLUMN_COUNT = RS_COLUMN_LAST + 1,
RS_COLUMN_INVALID,
};
enum rs_ss_force_opt {
RS_SS_FORCE_NONE = 0,
RS_SS_FORCE_STBC,
RS_SS_FORCE_BFER,
RS_SS_FORCE_SISO,
};
/* Packet stats per rate */
struct rs_rate_stats {
u64 success;
u64 total;
};
/**
* struct iwl_scale_tbl_info -- tx params and success history for all rates
*
* There are two of these in struct iwl_lq_sta,
* one for "active", and one for "search".
*/
struct iwl_scale_tbl_info {
struct rs_rate rate;
enum rs_column column;
const u16 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
/* per txpower-reduction history */
struct iwl_rate_scale_data tpc_win[TPC_MAX_REDUCTION + 1];
};
enum {
RS_STATE_SEARCH_CYCLE_STARTED,
RS_STATE_SEARCH_CYCLE_ENDED,
RS_STATE_STAY_IN_COLUMN,
};
/**
* struct iwl_lq_sta -- driver's rate scaling private structure
*
* Pointer to this gets passed back and forth between driver and mac80211.
*/
struct iwl_lq_sta {
u8 active_tbl; /* index of active table, range 0-1 */
u8 rs_state; /* RS_STATE_* */
u8 search_better_tbl; /* 1: currently trying alternate mode */
s32 last_tpt;
/* The following determine when to search for a new mode */
u32 table_count_limit;
u32 max_failure_limit; /* # failed frames before new search */
u32 max_success_limit; /* # successful frames before new search */
u32 table_count;
u32 total_failed; /* total failed frames, any/all rates */
u32 total_success; /* total successful frames, any/all rates */
u64 flush_timer; /* time staying in mode before new search */
u32 visited_columns; /* Bitmask marking which Tx columns were
* explored during a search cycle
*/
u64 last_tx;
bool is_vht;
bool ldpc; /* LDPC Rx is supported by the STA */
bool stbc_capable; /* Tx STBC is supported by chip and Rx by STA */
bool bfer_capable; /* Remote supports beamformee and we BFer */
enum ieee80211_band band;
/* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
unsigned long active_legacy_rate;
unsigned long active_siso_rate;
unsigned long active_mimo2_rate;
/* Highest rate per Tx mode */
u8 max_legacy_rate_idx;
u8 max_siso_rate_idx;
u8 max_mimo2_rate_idx;
/* Optimal rate based on RSSI and STA caps.
* Used only to reflect link speed to userspace.
*/
struct rs_rate optimal_rate;
unsigned long optimal_rate_mask;
const struct rs_init_rate_info *optimal_rates;
int optimal_nentries;
u8 missed_rate_counter;
struct iwl_lq_cmd lq;
struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
u8 tx_agg_tid_en;
/* last tx rate_n_flags */
u32 last_rate_n_flags;
/* packets destined for this STA are aggregated */
u8 is_agg;
/* tx power reduce for this sta */
int tpc_reduce;
/* persistent fields - initialized only once - keep last! */
struct lq_sta_pers {
#ifdef CONFIG_MAC80211_DEBUGFS
u32 dbg_fixed_rate;
u8 dbg_fixed_txp_reduction;
/* force STBC/BFER/SISO for testing */
enum rs_ss_force_opt ss_force;
#endif
u8 chains;
s8 chain_signal[IEEE80211_MAX_CHAINS];
s8 last_rssi;
struct rs_rate_stats tx_stats[RS_COLUMN_COUNT][IWL_RATE_COUNT];
struct iwl_mvm *drv;
} pers;
};
/* Initialize station's rate scaling information after adding station */
void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
enum ieee80211_band band, bool init);
/* Notify RS about Tx status */
void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
int tid, struct ieee80211_tx_info *info);
/**
* 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
*
*/
int iwl_mvm_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.
*/
void iwl_mvm_rate_control_unregister(void);
struct iwl_mvm_sta;
int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
bool enable);
#endif /* __rs__ */
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