RC
[UMAC]

Declaration of all functions used for rate control algorithm. More...

Collaboration diagram for RC:

Data Structures
struct	rc_rate_stats
	Statistics table. More...
struct	rc_sta_stats
	Rate control structure. More...
Defines
#define	RC_USE_MAX_BW 0
	Set 1 to always use maximum allowed BW.
#define	RC_MAX_NUM_RETRY (2)
	Maximum number of retries of each step of the retry chain.
#define	RC_PERIOD_TOUT (100000)
	Rate control algorithm execution period (us).
#define	RC_TRIAL_PERIOD (10)
	Rate control algorithm trial TX interval (number of TX).
#define	RC_MAX_N_SAMPLE (10)
	Maximum number of samples to be maintained in the statistics structure.
#define	RC_HE_STATS_IDX RC_MAX_N_SAMPLE
	Index of the HE statistics element in the table.
#define	RC_SCALE (16)
	Scaling used for the fractional computation.
#define	EWMA_LEVEL (96)
	Default weight used in the Exponentially Weighted Moving Average computation.
#define	EWMA_DIV (128)
	Divisor used in the Exponentially Weighted Moving Average computation.
#define	RC_FRAC(val, div) (((val) << RC_SCALE) / (div))
	Compute a fractional number.
#define	RC_TRUNC(val) ((val) >> RC_SCALE)
	Get the integer part of a fractional number.
#define	DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
	Divide and round to the upper integer.
#define	RC_FIXED_RATE_NOT_SET (0xFFFF)
	Disabled fixed rate configuration.
Functions
static void	rc_calc_prob_ewma (struct rc_rate_stats *rc_rs)
	Calculates probability of success with EWMA.
static uint16_t	rc_set_previous_mcs_index (struct rc_sta_stats *rc_ss, uint16_t rate_config)
	Updates the MCS / rate index of the rate configuration, setting the previous if available.
static uint16_t	rc_set_next_mcs_index (struct rc_sta_stats *rc_ss, uint16_t rate_config)
	Updates the MCS / rate index of the rate configuration, setting the next if available.
static bool	rc_check_rate_duplicated (struct rc_sta_stats *rc_ss, uint16_t rate_config)
	Checks if the rate configuration is already present in the sample table.
static uint16_t	rc_new_random_rate (struct rc_sta_stats *rc_ss)
	Gets a new random rate configuration.
static bool	rc_set_trial_tx (struct rc_sta_stats *rc_ss)
	Selects a new rate to be used as trial rate and stores its index.
static bool	rc_update_stats (struct rc_sta_stats *rc_ss, bool init)
	Calculate statistics, fills the new retry chain, updates the sample table.
static void	rc_update_retry_chain (struct rc_sta_stats rc_ss, uint32_t cur_tp)
	Updates the retry chain.
static void	rc_get_new_samples (struct rc_sta_stats *rc_ss)
	Replaces not useful samples of the sample table with new ones.
static bool	rc_update_stats_fixed_rate (struct rc_sta_stats *rc_ss)
	Update the retry chain and statistics when a fix rate is set.
static uint32_t	ewma (uint32_t old_val, uint32_t new_val, uint32_t weight)
	Perform EWMA (Exponentially Weighted Moving Average) calculation;.
static uint8_t	rc_get_format_mod (uint16_t rate_config)
	Extract the format from the rate configuration.
static uint8_t	rc_get_bw (uint16_t rate_config)
	Extract the bandwidth from the rate configuration.
static uint8_t	rc_get_nss (uint16_t rate_config)
	Extract the number of spatial streams from the rate configuration.
static uint8_t	rc_get_mcs_index (uint16_t rate_config)
	Extract the MCS / rate index from the rate configuration.
static uint8_t	rc_get_sgi (uint32_t rate_config)
	Extract the Short Guard interval setting from the rate configuration.
static uint8_t	rc_get_pre_type (uint16_t rate_config)
	Extract the preamble type from the rate configuration.
static bool	is_cck_group (uint16_t rate_config)
	Checks if the rate configuration corresponds to a CCK rate.
static bool	rc_check_trial_tx (struct rc_sta_stats *rc_ss)
	Checks if a trial transmission is requested.
static void	rc_sort_samples_tp (struct rc_sta_stats rc_ss, uint32_t cur_tp)
	Sort sample table from lower to higher throughput.
static bool	rc_check_valid_rate (struct rc_sta_stats *rc_ss, uint16_t rate_config)
	Checks if the rate configuration is allowed.
static void	rc_get_new_sample_rates (struct rc_sta_stats rc_ss, uint16_t new_rate_cfg_array, uint8_t n_new_samples)
	Selects new samples for the sample table.
static uint16_t	rc_get_lowest_rate_config (struct rc_sta_stats *rc_ss)
	Gets the rate configuration of the lowest allowed rate for the station.
static uint16_t	rc_get_initial_rate_config (struct rc_sta_stats *rc_ss)
	Gets the rate configuration of the initial rate for the station.
static uint16_t	rc_get_num_samples (struct rc_sta_stats *rc_ss)
	Gets the number of samples to be used by the RC algorithm.
static void	rc_set_rate_configs (struct rc_sta_stats *rc_ss)
	Sets the rate configurations of the sample table entries.
static void	rc_init_rates (uint8_t sta_idx)
	RC algorithm retry chain and sample table initialization.
static void	rc_set_max_amsdu_len (struct rc_sta_stats *rc_ss)
	Sets the maximum AMSDU length, depending on the number of spatial streams.
static void	rc_set_aggregation_flag (struct rc_sta_stats rc_ss, bool tx_ampdu)
	Sets/resets the aggregation flag This function updates the value of the aggregation flag depending on the rates set in the retry chain.
static void	rc_update_counters (struct txdesc *txdesc, uint32_t attempts, uint32_t failures, bool tx_ampdu)
	Updates Rate Control statistics after sending an A-MPDU.
void	rc_cfm_singleton (struct txdesc *txdesc)
	Updates Rate Control statistics after sending a singleton frame.
void	rc_cfm_ampdu (struct txdesc *txdesc, uint32_t txed, uint32_t txok)
	Updates Rate Control statistics after sending an A-MPDU.
void	rc_check (struct txdesc *txdesc)
	RC algorithm check.
void	rc_init (struct sta_info_tag *sta)
	RC algorithm initialization.
uint32_t	rc_get_duration (struct rc_rate_stats *rate_stats)
	Gets the TX duration of a packet of 1200 bytes.
void	rc_update_sample_table (uint8_t sta_idx)
	Resets the sample table and fills it with new random samples.
void	rc_update_bw_nss_max (uint8_t sta_idx, uint8_t bw_max, uint8_t nss_max)
	Updates the maximum bandwidth and spatial streams allowed by the station.
void	rc_update_preamble_type (uint8_t sta_idx, uint8_t preamble_type)
	Updates the preamble type allowed by the station.
void	rc_init_bcmc_rate (struct sta_info_tag *sta, uint8_t basic_rate_idx)
	Initializes the RC algorithm for BC/MC transmissions.
bool	rc_check_fixed_rate_config (struct rc_sta_stats *rc_ss, uint16_t fixed_rate_config)
	Checks whether the requested fixed rate is compliant with the peer STA capabilities.
uint32_t	rc_calc_tp (struct rc_sta_stats *rc_ss, uint8_t sample_idx)
	Calculates the throughput of an entry of the sample table.
void	rc_trial_check_bfm_stbc_htc (struct txl_buffer_control *buf_ctrl, uint32_t trial_rate, bool can_use_bfm, bool use_stbc, uint8_t stbc_nss, uint8_t nc, uint8_t ntx, bool can_use_htc)
	Checks if STBC, beamforming and +HTC can be used for the trial transmission and sets the tx_flags in the buffer control structure accordingly.
__INLINE uint16_t	rc_get_max_amsdu_len (struct sta_info_tag *sta)
	Gets the maximum AMSDU length we can transmit to a given station.
__INLINE struct rc_sta_stats *	rc_get_sta_stats (uint8_t sta_idx)
	Gets the pointer to the rate control station statistics structure.
__INLINE bool	rc_check_aggregation (struct sta_info_tag *sta)
	Gets the aggregation enabled flag for given station.
Variables
struct me_env_tag	me_env
	ME module environment variable.
struct rc_sta_stats	sta_stats [NX_REMOTE_STA_MAX]
	Array of rate control statistics.
static const uint32_t	rc_duration_ht_ampdu [10 4 2]
	Transmission duration in nsecs of 1200 bytes for a HT/VHT MCS.
static const uint32_t	rc_duration_cck [4 *2]
	Transmission duration in nsecs of 1200 bytes.
static const uint32_t	rc_duration_non_ht [8]
	Transmission duration in nsecs of 1200 bytes.
RC information flags
Flag indicating whether next transmission could be part of a AMPDU
#define	RC_AGG_TX_MASK CO_BIT(1)
	Offset of the aggregation flag.
#define	RC_AGG_ALLOWED_OFT (2)
	Offset of the aggregation flag.
#define	RC_AGG_ALLOWED_MASK CO_BIT(RC_AGG_ALLOWED_OFT)
	Flag indicating whether aggregation is allowed by the rate control.
#define	RC_FIX_RATE_STATUS_OFT (4)
	Offset of fixed rate status.
#define	RC_FIX_RATE_STATUS_MASK (3 << RC_FIX_RATE_STATUS_OFT)
	Mask of the fixed rate status.
#define	RC_FIX_RATE_NOTEN_MASK (0 << RC_FIX_RATE_STATUS_OFT)
	Fixed rate not enabled.
#define	RC_FIX_RATE_REQ_MASK (1 << RC_FIX_RATE_STATUS_OFT)
	Fixed rate requested.
#define	RC_FIX_RATE_EN_MASK (2 << RC_FIX_RATE_STATUS_OFT)
	Fixed rate enabled.
#define	RC_SS_UPD_REQ_MASK CO_BIT(6)
	Flag indicating whether the rate control station statistics table needs to be updated.
#define	RC_FIX_RATE_UPD_SS_REQ_MASK CO_BIT(7)
	Flag indicating whether the rates should be re-initialised after the fixed rate period.
RC control information inside TX descriptor
SW retry step offset
#define	RC_SW_RETRY_STEP_OFT 0
	SW retry step mask.
#define	RC_SW_RETRY_STEP_MSK (0x03 << RC_SW_RETRY_STEP_OFT)
	SW retry step mask.
#define	RC_RETRY_CHAIN_VER_OFT 2
	Retry chain version offset.
#define	RC_RETRY_CHAIN_VER_MSK (0x03 << RC_RETRY_CHAIN_VER_OFT)
	Retry chain version mask.
#define	RC_CONTROL_GET(rc_control, field) (((rc_control) & RC_##field##_MSK) >> RC_##field##_OFT)
	Macro used to retrieve a field from the RC control field.
RC trial states
Wait for the next time to transmit a trial rate
#define	RC_TRIAL_STATUS_WAIT (0)
	Wait the trial rate transmission confirmation.
#define	RC_TRIAL_STATUS_WAIT_CFM (1)
	Wait the trial rate transmission confirmation.

Detailed Description

Declaration of all functions used for rate control algorithm.

Define Documentation

#define DIV_ROUND_UP	(	n,
		d		)	(((n) + (d) - 1) / (d))

Divide and round to the upper integer.

Parameters:

`[in]`	n	Number to be divided
`[in]`	d	Divisor

Returns:: The up-rounded result of the division

Definition at line 89 of file rc.h.

#define RC_FRAC	(	val,
		div		)	(((val) << RC_SCALE) / (div))

Compute a fractional number.

Parameters:

`[in]`	val	Value to be divided
`[in]`	div	Divisor

Returns:: The value of the fraction

Definition at line 74 of file rc.h.

Referenced by rc_calc_prob_ewma(), rc_get_new_samples(), rc_init_rates(), rc_set_aggregation_flag(), rc_set_trial_tx(), rc_update_retry_chain(), and rc_update_stats().

#define RC_PERIOD_TOUT (100000)

Rate control algorithm execution period (us).

Warning:: This value shall not exceed 200ms in order not to overflow internal RC variables during statistics computation

Definition at line 49 of file rc.h.

Referenced by rc_update_counters().

#define RC_TRUNC ( val ) ((val) >> RC_SCALE)

Get the integer part of a fractional number.

Parameters:

[in] val Value to be checked

Returns:: The integer part of the number

Definition at line 81 of file rc.h.

Referenced by rc_set_trial_tx().

Function Documentation

static uint32_t ewma	(	uint32_t	old_val,
		uint32_t	new_val,
		uint32_t	weight
	)			`[inline, static]`

Perform EWMA (Exponentially Weighted Moving Average) calculation;.

Parameters:

`[in]`	old_val	old value
`[in]`	new_val	new value
`[in]`	weight	weight to be used in the EWMA

Returns:: Result of EWMA.

Definition at line 232 of file rc.c.

References EWMA_DIV.

Referenced by rc_calc_prob_ewma(), and rc_update_stats().

static bool is_cck_group ( uint16_t rate_config ) [static]

Checks if the rate configuration corresponds to a CCK rate.

Parameters:

[in] rate_config rate configuration

Returns:: Whether the rate configuration corresponds to a CCK rate

Definition at line 967 of file rc.c.

References FORMATMOD_HT_MF, HW_RATE_6MBPS, rc_get_format_mod(), and rc_get_mcs_index().

Referenced by rc_update_retry_chain().

static void rc_calc_prob_ewma ( struct rc_rate_stats * rc_rs ) [static]

Calculates probability of success with EWMA.

Parameters:

[in] rc_rs pointer to rate control station statistics structure

Definition at line 382 of file rc.c.

References rc_rate_stats::attempts, ewma(), EWMA_LEVEL, rc_rate_stats::old_prob_available, rc_rate_stats::probability, RC_FRAC, rc_rate_stats::sample_skipped, and rc_rate_stats::success.

Referenced by rc_update_stats(), and rc_update_stats_fixed_rate().

uint32_t rc_calc_tp	(	struct rc_sta_stats *	rc_ss,
		uint8_t	sample_idx
	)

Calculates the throughput of an entry of the sample table.

Calculates the throughput based on the average A-MPDU length, taking into account the expected number of retransmissions and their expected length.

Parameters:

`[in]`	rc_ss	Pointer to rate control station statistics structure
`[in]`	sample_idx	Index of the entry of the sample table

Returns:: Calculated throughput

Referenced by me_rc_stats_req_handler(), and rc_update_stats().

void rc_cfm_ampdu	(	struct txdesc *	txdesc,
		uint32_t	txed,
		uint32_t	txok
	)

Updates Rate Control statistics after sending an A-MPDU.

Parameters:

`[in]`	txdesc	TX descriptor of the first MPDU of the A-MPDU
`[in]`	txed	Number of frame transmitted in the A-MDPU
`[in]`	txok	Number of frame successfully transmitted in the A-MDPU

Referenced by txl_cfm_evt().

void rc_cfm_singleton ( struct txdesc * txdesc )

Updates Rate Control statistics after sending a singleton frame.

Parameters:

[in] txdesc TX descriptor of the singleton sent

Referenced by txl_cfm_evt().

void rc_check ( struct txdesc * txdesc )

RC algorithm check.

This function shall be called upon queuing of every packets within the TX path. It checks if:

it's time to update statistics and select the new retry chain steps;
it's time to select the next step of the retry chain because the max number of retries for the AMPDU has been reached;
it's time to do a trial transmission.

Parameters:

[in,out] txdesc TX descriptor of the packet to be transmitted

Referenced by txu_cntrl_check_rate().

__INLINE bool rc_check_aggregation ( struct sta_info_tag * sta )

Gets the aggregation enabled flag for given station.

Parameters:

[in] sta Pointer to the station entry

Returns:: Whether the aggregation is allowed or not.

Definition at line 324 of file rc.h.

References rc_sta_stats::info, sta_info_tag::pol_tbl, RC_AGG_ALLOWED_MASK, RC_AGG_ALLOWED_OFT, and sta_pol_tbl_cntl::sta_stats.

bool rc_check_fixed_rate_config	(	struct rc_sta_stats *	rc_ss,
		uint16_t	fixed_rate_config
	)

Checks whether the requested fixed rate is compliant with the peer STA capabilities.

Parameters:

`[in]`	rc_ss	Pointer to rate control station statistics structure
`[in]`	fixed_rate_config	Fixed rate configuration

Returns:: true if configuration is OK, false otherwise

Referenced by me_rc_set_rate_req_handler().

static bool rc_check_rate_duplicated	(	struct rc_sta_stats *	rc_ss,
		uint16_t	rate_config
	)			`[static]`

Checks if the rate configuration is already present in the sample table.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	rate_config	rate configuration to be checked

Returns:: Whether the rate configuration is already present in the sample table.

Definition at line 605 of file rc.c.

References rc_sta_stats::no_samples, rc_rate_stats::rate_config, and rc_sta_stats::rate_stats.

Referenced by rc_get_new_samples(), and rc_set_rate_configs().

static bool rc_check_trial_tx ( struct rc_sta_stats * rc_ss ) [static]

Checks if a trial transmission is requested.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Returns:: Whether a trial transmission is requested.

Definition at line 1106 of file rc.c.

References rc_sta_stats::info, RC_FIX_RATE_EN_MASK, rc_get_new_samples(), rc_set_trial_tx(), RC_SS_UPD_REQ_MASK, RC_TRIAL_STATUS_WAIT, rc_sta_stats::sample_wait, and rc_sta_stats::trial_status.

static bool rc_check_valid_rate	(	struct rc_sta_stats *	rc_ss,
		uint16_t	rate_config
	)			`[static]`

Checks if the rate configuration is allowed.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	rate_config	rate configuration to be verified

Returns:: Whether the rate configuration is allowed.

Definition at line 1383 of file rc.c.

References BW_160MHZ, BW_20MHZ, BW_80MHZ, CO_BIT, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, rc_sta_stats::ht, MAC_VHT_MCS_MAP_MSK, rc_rate_stats::rate_allowed, rc_sta_stats::rate_map, rc_sta_stats::rate_map_l, rc_get_bw(), rc_get_format_mod(), rc_get_mcs_index(), and rc_get_nss().

Referenced by rc_get_new_sample_rates().

static uint8_t rc_get_bw ( uint16_t rate_config ) [static]

Extract the bandwidth from the rate configuration.

Parameters:

[in] rate_config rate configuration to be updated

Returns:: Bandwidth.

Definition at line 256 of file rc.c.

References BW_TX_RCX_MASK, and BW_TX_RCX_OFT.

Referenced by rc_check_valid_rate().

uint32_t rc_get_duration ( struct rc_rate_stats * rate_stats )

Gets the TX duration of a packet of 1200 bytes.

Parameters:

[in] rate_stats Rate statistics element (including the rate configuration info)

Returns:: Transmission duration in nsecs.

Referenced by rc_set_trial_tx().

static uint8_t rc_get_format_mod ( uint16_t rate_config ) [static]

Extract the format from the rate configuration.

Parameters:

[in] rate_config rate configuration to be updated

Returns:: Format.

Definition at line 244 of file rc.c.

References FORMAT_MOD_TX_RCX_MASK, and FORMAT_MOD_TX_RCX_OFT.

Referenced by is_cck_group(), rc_check_valid_rate(), rc_get_mcs_index(), rc_get_new_sample_rates(), rc_get_nss(), rc_set_aggregation_flag(), rc_set_next_mcs_index(), rc_set_previous_mcs_index(), and rc_set_trial_tx().

static uint16_t rc_get_initial_rate_config ( struct rc_sta_stats * rc_ss ) [static]

Gets the rate configuration of the initial rate for the station.

Highest rate index for NON-HT, MCS7 or highest allowed for HT, MCS7 for VHT

Parameters:

[in] rc_ss Pointer to rate control station statistics structure

Returns:: Initial rate configuration

Definition at line 1727 of file rc.c.

References rc_sta_stats::bw_max, BW_TX_RCX_OFT, co_clz(), rc_sta_stats::format_mod, FORMAT_MOD_TX_RCX_OFT, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, GI_TYPE_0_8, rc_sta_stats::ht, HT_NSS_OFT, MCS_INDEX_TX_RCX_OFT, rc_sta_stats::no_ss, PRE_TYPE_TX_RCX_OFT, rc_sta_stats::r_idx_max, rc_sta_stats::rate_map, rc_sta_stats::short_gi, SHORT_GI_TX_RCX_OFT, rc_sta_stats::type, and VHT_NSS_OFT.

Referenced by rc_set_rate_configs().

static uint16_t rc_get_lowest_rate_config ( struct rc_sta_stats * rc_ss ) [static]

Gets the rate configuration of the lowest allowed rate for the station.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Returns:: Rate configuration of the lowest allowed rate

Definition at line 1647 of file rc.c.

References rc_sta_stats::format_mod, FORMAT_MOD_TX_RCX_OFT, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, GI_TYPE_1_6, MCS_INDEX_TX_RCX_OFT, PRE_TYPE_TX_RCX_OFT, and rc_sta_stats::r_idx_min.

Referenced by rc_set_rate_configs().

__INLINE uint16_t rc_get_max_amsdu_len ( struct sta_info_tag * sta )

Gets the maximum AMSDU length we can transmit to a given station.

Parameters:

[in] sta Pointer to the station entry

Returns:: Maximum AMSDU length. Value 0 means that AMSDU are not allowed.

Definition at line 288 of file rc.h.

References rc_sta_stats::curr_amsdu_len, sta_info_tag::pol_tbl, and sta_pol_tbl_cntl::sta_stats.

Referenced by me_tx_cfm_amsdu().

static uint8_t rc_get_mcs_index ( uint16_t rate_config ) [static]

Extract the MCS / rate index from the rate configuration.

Parameters:

[in] rate_config rate configuration to be updated

Returns:: MCS / rate index.

Definition at line 304 of file rc.c.

References rc_sta_stats::format_mod, FORMATMOD_HE_MU, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, HT_MCS_MASK, HT_MCS_OFT, MCS_INDEX_TX_RCX_MASK, MCS_INDEX_TX_RCX_OFT, rc_get_format_mod(), VHT_MCS_MASK, and VHT_MCS_OFT.

Referenced by is_cck_group(), rc_check_valid_rate(), rc_set_aggregation_flag(), rc_set_max_amsdu_len(), rc_set_next_mcs_index(), and rc_set_previous_mcs_index().

static void rc_get_new_sample_rates	(	struct rc_sta_stats *	rc_ss,
		uint16_t *	new_rate_cfg_array,
		uint8_t	n_new_samples
	)			`[static]`

Selects new samples for the sample table.

This function selects a new set of samples:

random rate
same rate configuration of best throughput rate, but with opposite guard interval (only if HT or VHT station)
MCS index / rate index above the best throughput rate, short GI if allowed
MCS index / rate index below the best throughput rate, short GI if allowed
MCS index / rate index above the 2nd best throughput rate, short GI if allowed

MCS index / rate index below the 2nd best throughput rate, short GI if allowed Samples not available are set to 0xFF.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	new_rate_cfg_array	pointer to the array of new samples rate configuration
`[in]`	n_new_samples	number of new samples to be set

Definition at line 1481 of file rc.c.

References FORMATMOD_HE_SU, FORMATMOD_HT_MF, HE_GI_TYPE_TX_RCX_MASK, HE_GI_TYPE_TX_RCX_OFT, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, rc_check_valid_rate(), rc_get_format_mod(), rc_new_random_rate(), rc_set_next_mcs_index(), rc_set_previous_mcs_index(), rc_sta_stats::retry_step_idx, rc_sta_stats::short_gi, and SHORT_GI_TX_RCX_MASK.

Referenced by rc_get_new_samples().

static void rc_get_new_samples ( struct rc_sta_stats * rc_ss ) [static]

Replaces not useful samples of the sample table with new ones.

This function discards some of the samples from the sample table and replaces them with new ones. The samples are discarded if:

samples are not used in the retry chain
their probability is less than 50% or
samples have already been skipped more than 10 times. The new samples are selected in the function rc_get_new_sample_rates().
Parameters:

[in] rc_ss pointer to rate control station statistics structure

Definition at line 1590 of file rc.c.

References rc_sta_stats::no_samples, rc_rate_stats::old_prob_available, rc_rate_stats::probability, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, rc_check_rate_duplicated(), RC_FRAC, rc_get_new_sample_rates(), RC_MAX_N_SAMPLE, rc_sta_stats::retry_step_idx, and rc_rate_stats::sample_skipped.

Referenced by rc_check_trial_tx().

static uint8_t rc_get_nss ( uint16_t rate_config ) [static]

Extract the number of spatial streams from the rate configuration.

Parameters:

[in] rate_config rate configuration to be updated

Returns:: Number of spatial streams.

Definition at line 268 of file rc.c.

References rc_sta_stats::format_mod, FORMATMOD_HE_MU, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_VHT, HT_NSS_MASK, HT_NSS_OFT, rc_get_format_mod(), VHT_NSS_MASK, and VHT_NSS_OFT.

Referenced by rc_check_valid_rate(), rc_set_aggregation_flag(), rc_set_next_mcs_index(), rc_set_previous_mcs_index(), and rc_set_trial_tx().

static uint16_t rc_get_num_samples ( struct rc_sta_stats * rc_ss ) [static]

Gets the number of samples to be used by the RC algorithm.

This function calculates the number of samples to be used for the sample table of the RC algorithm, depending on the number of available rates for the station. The maximum number of samples is limited to RC_MAX_N_SAMPLE.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Returns:: Number of samples to be used

Definition at line 1789 of file rc.c.

References rc_sta_stats::bw_max, rc_sta_stats::format_mod, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, rc_sta_stats::ht, HW_RATE_11MBPS, HW_RATE_2MBPS, HW_RATE_54MBPS, HW_RATE_6MBPS, MAC_HE_MCS_MAP_MSK, MAC_VHT_MCS_MAP_MSK, rc_sta_stats::no_ss, rc_sta_stats::rate_map, rc_sta_stats::rate_map_l, RC_MAX_N_SAMPLE, rc_sta_stats::short_gi, and rc_sta_stats::type.

static uint8_t rc_get_pre_type ( uint16_t rate_config ) [static]

Extract the preamble type from the rate configuration.

Parameters:

[in] rate_config rate configuration to be updated

Returns:: Preamble type.

Definition at line 371 of file rc.c.

References PRE_TYPE_TX_RCX_MASK, and PRE_TYPE_TX_RCX_OFT.

static uint8_t rc_get_sgi ( uint32_t rate_config ) [static]

Extract the Short Guard interval setting from the rate configuration.

Parameters:

[in] rate_config rate configuration to be updated

Returns:: 0 if LGI, 1 if SGI.

Definition at line 359 of file rc.c.

References SHORT_GI_TX_RCX_MASK, and SHORT_GI_TX_RCX_OFT.

__INLINE struct rc_sta_stats* rc_get_sta_stats ( uint8_t sta_idx ) [read]

Gets the pointer to the rate control station statistics structure.

Parameters:

[in] sta_idx Station index

Returns:: Pointer to the RC station statistics structure

Definition at line 305 of file rc.h.

References ASSERT_ERR, sta_info_tag::pol_tbl, sta_info_tab, and sta_pol_tbl_cntl::sta_stats.

Referenced by txl_buffer_control_trial().

void rc_init ( struct sta_info_tag * sta )

RC algorithm initialization.

This function sets the pointer to the statics structure for the station, reads the capability informations about the station (format, max bw, max spatial streams, max MCS, guard interval, min and max rate index, preamble type) and sets them into the RC statistics structure, initializes the rate control algorithm.

Parameters:

[in] sta pointer to STA Info Table

Referenced by me_init_rate().

void rc_init_bcmc_rate	(	struct sta_info_tag *	sta,
		uint8_t	basic_rate_idx
	)

Initializes the RC algorithm for BC/MC transmissions.

Parameters:

`[in]`	sta	Pointer to the station entry
`[in]`	basic_rate_idx	Rate index of the basic rate to be set

Referenced by me_init_bcmc_rate().

static void rc_init_rates ( uint8_t sta_idx ) [static]

RC algorithm retry chain and sample table initialization.

This function initializes the rates of the sample table and then it sets the retry chain:

step 0: set to the highest rate (entry no_samples-1 of sample table)
step 3: set to the lowest rate (entry 0 of sample table)
step 1 and 2: set randomly (random entry between 1 and no_samples-2)
Parameters:

[in] sta_idx index of the station

Definition at line 1950 of file rc.c.

References ASSERT_ERR, rc_sta_stats::avg_ampdu_len, rc_sta_stats::fixed_rate_cfg, rc_sta_stats::info, rc_sta_stats::no_samples, sta_info_tag::pol_tbl, RATE_CONTROL_STEPS, RC_FIXED_RATE_NOT_SET, RC_FRAC, rc_set_rate_configs(), RC_TRIAL_STATUS_WAIT, rc_update_stats(), rc_sta_stats::retry_step_idx, rc_sta_stats::sample_wait, sta_info_tab, sta_pol_tbl_cntl::sta_stats, rc_sta_stats::trial_idx, and rc_sta_stats::trial_status.

static uint16_t rc_new_random_rate ( struct rc_sta_stats * rc_ss ) [static]

Gets a new random rate configuration.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Returns:: The random rate configuration

Definition at line 789 of file rc.c.

References BW_160MHZ, BW_20MHZ, BW_80MHZ, rc_sta_stats::bw_max, BW_TX_RCX_MASK, BW_TX_RCX_OFT, CO_BIT, co_rand_hword(), rc_sta_stats::format_mod, FORMAT_MOD_TX_RCX_MASK, FORMAT_MOD_TX_RCX_OFT, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, HE_GI_TYPE_TX_RCX_MASK, HE_GI_TYPE_TX_RCX_OFT, rc_sta_stats::ht, HT_MCS_MASK, HT_MCS_OFT, HT_NSS_MASK, HT_NSS_OFT, HW_RATE_11MBPS, HW_RATE_1MBPS, MAC_HE_MCS_MAP_MSK, MAC_VHT_MCS_MAP_MSK, MCS_INDEX_TX_RCX_MASK, MCS_INDEX_TX_RCX_OFT, rc_sta_stats::mcs_max, rc_sta_stats::no_ss, PRE_TYPE_TX_RCX_MASK, PRE_TYPE_TX_RCX_OFT, rc_sta_stats::r_idx_max, rc_sta_stats::r_idx_min, rc_sta_stats::rate_map, rc_sta_stats::rate_map_l, rc_sta_stats::short_gi, SHORT_GI_TX_RCX_MASK, SHORT_GI_TX_RCX_OFT, rc_sta_stats::type, VHT_MCS_MASK, VHT_MCS_OFT, VHT_NSS_MASK, and VHT_NSS_OFT.

Referenced by rc_get_new_sample_rates(), and rc_set_rate_configs().

static void rc_set_aggregation_flag	(	struct rc_sta_stats *	rc_ss,
		bool *	tx_ampdu
	)			`[static]`

Sets/resets the aggregation flag This function updates the value of the aggregation flag depending on the rates set in the retry chain.

The aggregation is disabled only for legacy rates, since it's not supported. The aggregation is disabled if:

one the steps 0-2 of the retry chain is a legacy rate
first step of the retry chain is HT/VHT, 1SS, with low MCS and low probability (<10%)
Parameters:

[in] rc_ss pointer to rate control station statistics structure

[in] tx_ampdu pointer to the aggregation flag

Definition at line 2038 of file rc.c.

References FORMATMOD_HT_MF, HW_RATE_54MBPS, rc_sta_stats::info, rc_rate_stats::probability, rc_sta_stats::r_idx_min, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, RC_AGG_ALLOWED_MASK, RC_AGG_ALLOWED_OFT, RC_FIX_RATE_EN_MASK, RC_FRAC, rc_get_format_mod(), rc_get_mcs_index(), rc_get_nss(), rc_sta_stats::retry_step_idx, and rc_sta_stats::sw_retry_step.

static void rc_set_max_amsdu_len ( struct rc_sta_stats * rc_ss ) [static]

Sets the maximum AMSDU length, depending on the number of spatial streams.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Definition at line 1991 of file rc.c.

References co_min(), rc_sta_stats::curr_amsdu_len, rc_sta_stats::max_amsdu_len, rc_sta_stats::no_ss, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, rc_get_mcs_index(), rc_sta_stats::retry_step_idx, and rc_sta_stats::sw_retry_step.

static uint16_t rc_set_next_mcs_index	(	struct rc_sta_stats *	rc_ss,
		uint16_t	rate_config
	)			`[static]`

Updates the MCS / rate index of the rate configuration, setting the next if available.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	rate_config	rate configuration to be updated

Returns:: Rate configuration updated.

Definition at line 514 of file rc.c.

References CO_BIT, co_min(), rc_sta_stats::format_mod, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, rc_sta_stats::ht, HT_MCS_MASK, HW_RATE_11MBPS, HW_RATE_6MBPS, MAC_HE_MCS_MAP_MSK, MAC_VHT_MCS_MAP_MSK, MCS_INDEX_TX_RCX_MASK, rc_sta_stats::mcs_max, rc_sta_stats::r_idx_max, rc_sta_stats::rate_map, rc_sta_stats::rate_map_l, rc_get_format_mod(), rc_get_mcs_index(), rc_get_nss(), rc_sta_stats::short_gi, SHORT_GI_TX_RCX_MASK, and VHT_MCS_MASK.

Referenced by rc_get_new_sample_rates().

static uint16_t rc_set_previous_mcs_index	(	struct rc_sta_stats *	rc_ss,
		uint16_t	rate_config
	)			`[static]`

Updates the MCS / rate index of the rate configuration, setting the previous if available.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	rate_config	rate configuration to be updated

Returns:: Rate configuration updated.

Definition at line 427 of file rc.c.

References CO_BIT, co_max(), rc_sta_stats::format_mod, FORMATMOD_HE_SU, FORMATMOD_HT_GF, FORMATMOD_HT_MF, FORMATMOD_NON_HT, FORMATMOD_NON_HT_DUP_OFDM, FORMATMOD_VHT, rc_sta_stats::ht, HT_MCS_MASK, HW_RATE_6MBPS, MCS_INDEX_TX_RCX_MASK, rc_sta_stats::r_idx_min, rc_sta_stats::rate_map, rc_sta_stats::rate_map_l, rc_get_format_mod(), rc_get_mcs_index(), rc_get_nss(), rc_sta_stats::short_gi, SHORT_GI_TX_RCX_MASK, and VHT_MCS_MASK.

Referenced by rc_get_new_sample_rates().

static void rc_set_rate_configs ( struct rc_sta_stats * rc_ss ) [static]

Sets the rate configurations of the sample table entries.

This function initializes the rates of the sample table:

entry 0 is the lowest rate
entry no_samples-1 is the highest rate
entry from 1 to no_samples-2 are chosen randomly between the remaining rates.
Parameters:

[in] rc_ss pointer to rate control station statistics structure

Definition at line 1900 of file rc.c.

References rc_rate_stats::attempts, rc_sta_stats::no_samples, rc_rate_stats::old_prob_available, rc_rate_stats::probability, rc_rate_stats::rate_allowed, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, rc_check_rate_duplicated(), rc_get_initial_rate_config(), rc_get_lowest_rate_config(), rc_new_random_rate(), rc_rate_stats::sample_skipped, and rc_rate_stats::success.

Referenced by rc_init_rates().

static bool rc_set_trial_tx ( struct rc_sta_stats * rc_ss ) [static]

Selects a new rate to be used as trial rate and stores its index.

This function updates the trial period value, depending on the average AMPDU size, and picks a new random rate from the sample table. The index of the selected rate is stored in the station statistics structrure. The new rate is discarded if:

it is equal to one of the steps of the current retry chain
probability of the sample is already greater than 95%
in case of AMPDU transmission, HT station 2.4 GHz: the rate is a DSSS/CCK rate.
TX duration of the sample is greater than TX durations of steps 0, 1 and 2, respecting the samples frequently skipped.
current TP of the sample (taking into account the SW retries) is greater than TP of step 0 (HT, VHT), respecting the samples frequently skipped. The trial sample shall be inserted as step 0 of the retry chain if (HT/VHT STA) its expected throughput (calculated taking into account the current number of SW retry request) is greater than the throughput of step 0; (NON-HT STA) if TX duration of the sample is less than TX duration of step 0. Otherwise the trial rate is inserted as step 1 of the retry chain.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Returns:: Whether a trial sample has been selected and a trial transmission is requested

Definition at line 1005 of file rc.c.

References rc_sta_stats::avg_ampdu_len, co_rand_hword(), rc_sta_stats::format_mod, FORMATMOD_HT_MF, rc_sta_stats::info, rc_sta_stats::no_samples, rc_rate_stats::old_prob_available, rc_rate_stats::probability, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, RC_AGG_TX_MASK, RC_FRAC, rc_get_duration(), rc_get_format_mod(), rc_get_nss(), RC_TRIAL_PERIOD, RC_TRIAL_STATUS_WAIT_CFM, RC_TRUNC, rc_sta_stats::retry_step_idx, rc_rate_stats::sample_skipped, rc_sta_stats::sample_slow, rc_sta_stats::sample_wait, rc_sta_stats::trial_idx, and rc_sta_stats::trial_status.

Referenced by rc_check_trial_tx().

static void rc_sort_samples_tp	(	struct rc_sta_stats *	rc_ss,
		uint32_t *	cur_tp
	)			`[static]`

Sort sample table from lower to higher throughput.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	cur_tp	pointer to the array of current throughputs

Definition at line 1142 of file rc.c.

References rc_sta_stats::no_samples, and rc_sta_stats::rate_stats.

Referenced by rc_update_stats().

void rc_trial_check_bfm_stbc_htc	(	struct txl_buffer_control *	buf_ctrl,
		uint32_t	trial_rate,
		bool	can_use_bfm,
		bool	use_stbc,
		uint8_t	stbc_nss,
		uint8_t	nc,
		uint8_t	ntx,
		bool	can_use_htc
	)

Checks if STBC, beamforming and +HTC can be used for the trial transmission and sets the tx_flags in the buffer control structure accordingly.

Parameters:

`[in]`	buf_ctrl	pointer to the buffer control structure to be used
`[in]`	trial_rate	trial rate configuration
`[in]`	can_use_bfm	'1' if beamforming can be used with the current policy table; '0' otherwise
`[in]`	use_stbc	'1' if STBC can be used with the current policy table; '0' otherwise
`[in]`	stbc_nss	number of streams to use with STBC
`[in]`	nc	NC value received in the latest beamforming report
`[in]`	ntx	number of antennas
`[in]`	can_use_htc	'1' if +HTC can be used with the current policy table; '0' otherwise

Referenced by me_update_buffer_control().

void rc_update_bw_nss_max	(	uint8_t	sta_idx,
		uint8_t	bw_max,
		uint8_t	nss_max
	)

Updates the maximum bandwidth and spatial streams allowed by the station.

Parameters:

`[in]`	sta_idx	index of the station
`[in]`	bw_max	maximum bandwith
`[in]`	nss_max	maximum number of spatial streams

Referenced by me_pol_tbl_bw_upd(), and me_sta_bw_nss_max_upd().

static void rc_update_counters	(	struct txdesc *	txdesc,
		uint32_t	attempts,
		uint32_t	failures,
		bool	tx_ampdu
	)			`[static]`

Updates Rate Control statistics after sending an A-MPDU.

Parameters:

`[in]`	txdesc	TX descriptor of the MPDU just transmitted (or of the first MPDU of the transmitted A-MPDU)
`[in]`	attempts	Number of attempts with the current retry chain
`[in]`	failures	Number of failures with the current retry chain
`[in]`	tx_ampdu	'1' if the transmitted message is an AMPDU, '0' otherwise

Definition at line 2172 of file rc.c.

References rc_sta_stats::ampdu_len, rc_sta_stats::ampdu_packets, ASSERT_ERR, rc_rate_stats::attempts, hostdesc::flags, HE_TB_TX_BIT, txdesc::host, lmacdesc::hw_desc, sta_info_tag::inst_nbr, rc_sta_stats::last_rc_time, txdesc::lmac, NX_HE, NX_REMOTE_STA_MAX, sta_info_tag::pol_tbl, PROF_RC_SW_RETRY_CLR, PROF_RC_SW_RETRY_SET, PROF_RC_UPD_COUNTERS_CLR, PROF_RC_UPD_COUNTERS_SET, PROF_RC_UPD_COUNTERS_TRIAL_CLR, PROF_RC_UPD_COUNTERS_TRIAL_SET, rc_sta_stats::rate_stats, umacdesc::rc_control, RC_CONTROL_GET, RC_HE_STATS_IDX, RC_MAX_NUM_RETRY, RC_PERIOD_TOUT, RC_TRIAL_STATUS_WAIT, rc_sta_stats::retry_chain_ver, rc_sta_stats::retry_step_idx, sta_info_tab, sta_pol_tbl_cntl::sta_stats, hostdesc::staid, tx_hd::statinfo, rc_rate_stats::success, rc_sta_stats::sw_retry_step, tx_hw_desc::thd, rc_sta_stats::trial_idx, rc_sta_stats::trial_status, TXU_CNTRL_RC_TRIAL, and txdesc::umac.

void rc_update_preamble_type	(	uint8_t	sta_idx,
		uint8_t	preamble_type
	)

Updates the preamble type allowed by the station.

Parameters:

`[in]`	sta_idx	index of the station
`[in]`	preamble_type	preamble type to set

Referenced by me_pol_tbl_prot_upd().

static void rc_update_retry_chain	(	struct rc_sta_stats *	rc_ss,
		uint32_t *	cur_tp
	)			`[static]`

Updates the retry chain.

This function populates steps 0 and 1 of the retry chain table with the two highest throughputs. Then the function searches the rate, different from the previous two, with max throughput if proability is greater than 95% or with highest probability and uses its index for step 2 of the retry chain. Step 3 is set to the lowest rate (sample 0 of the table) and its TP value is updated.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	cur_tp	pointer to the array of current throughputs

Definition at line 1290 of file rc.c.

References rc_sta_stats::info, is_cck_group(), rc_sta_stats::no_samples, rc_rate_stats::probability, rc_rate_stats::rate_allowed, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, RC_AGG_TX_MASK, RC_FRAC, and rc_sta_stats::retry_step_idx.

Referenced by rc_update_stats().

void rc_update_sample_table ( uint8_t sta_idx )

Resets the sample table and fills it with new random samples.

Parameters:

[in] sta_idx index of the station

Referenced by me_rc_set_rate_req_handler().

static bool rc_update_stats	(	struct rc_sta_stats *	rc_ss,
		bool	init
	)			`[static]`

Calculate statistics, fills the new retry chain, updates the sample table.

This function updates throughput and probabilities of the sample table rates; selects the 1st and 2nd maximum throughput rates, maximum probability rate and updates the retry chain table. Then it replaces not useful samples of the sample table with new ones.

Parameters:

`[in]`	rc_ss	pointer to rate control station statistics structure
`[in]`	init	indicate if the statistics are updated during the initialization

Returns:: Whether the retry chain has been modified.

Definition at line 1183 of file rc.c.

References rc_sta_stats::ampdu_len, rc_sta_stats::ampdu_packets, rc_rate_stats::attempts, rc_sta_stats::avg_ampdu_len, ewma(), EWMA_LEVEL, rc_sta_stats::fixed_rate_cfg, rc_sta_stats::info, rc_sta_stats::no_samples, rc_rate_stats::rate_allowed, rc_rate_stats::rate_config, RATE_CONTROL_STEPS, rc_sta_stats::rate_stats, rc_calc_prob_ewma(), rc_calc_tp(), RC_FIXED_RATE_NOT_SET, RC_FRAC, RC_HE_STATS_IDX, RC_MAX_N_SAMPLE, rc_sort_samples_tp(), RC_SS_UPD_REQ_MASK, rc_update_retry_chain(), rc_update_stats_fixed_rate(), rc_sta_stats::retry_step_idx, rc_sta_stats::sample_slow, and rc_rate_stats::success.

Referenced by rc_init_rates().

static bool rc_update_stats_fixed_rate ( struct rc_sta_stats * rc_ss ) [static]

Update the retry chain and statistics when a fix rate is set.

This function inserts the fix rate in the sample table and updates the retry chain, if a fixed rate request is pending. Otherwise, it updates the statistics for the fixed rate.

Parameters:

[in] rc_ss pointer to rate control station statistics structure

Returns:: Whether the retry chain has been modified.

Definition at line 2100 of file rc.c.

References rc_rate_stats::attempts, rc_sta_stats::fixed_rate_cfg, rc_sta_stats::info, rc_sta_stats::no_samples, rc_rate_stats::probability, rc_rate_stats::rate_config, rc_sta_stats::rate_stats, rc_calc_prob_ewma(), RC_FIX_RATE_EN_MASK, RC_FIX_RATE_REQ_MASK, RC_FIX_RATE_STATUS_MASK, RC_TRIAL_STATUS_WAIT, rc_sta_stats::retry_step_idx, rc_rate_stats::success, and rc_sta_stats::trial_status.

Referenced by rc_update_stats().

Variable Documentation

const uint32_t rc_duration_cck[4 *2] [static]

Initial value:

{
    
    [  0] = 10452000,     [  1] = 10548000, 
    [  2] =  5380000,     [  3] =  5476000, 
    [  4] =  2315000,     [  5] =  2411000, 
    [  6] =  1439000,     [  7] =  1535000, 
}

Transmission duration in nsecs of 1200 bytes.

Index of the table is (MCS_IDX<<1) | (pre_type) where pre_type is 0 for long and short preamble 1 for long preamble only

Definition at line 179 of file rc.c.

const uint32_t rc_duration_ht_ampdu[10 *4 *2] [static]

Initial value:

{
    
    [  0] =  1476923,     [  1] =  1329231,     [  2] =   711111,     [  3] =   640000, 
    [  8] =   738462,     [  9] =   664615,     [ 10] =   355556,     [ 11] =   320000, 
    [ 16] =   492308,     [ 17] =   443077,     [ 18] =   237037,     [ 19] =   213333, 
    [ 24] =   369231,     [ 25] =   332308,     [ 26] =   177778,     [ 27] =   160000, 
    [ 32] =   246154,     [ 33] =   221538,     [ 34] =   118519,     [ 35] =   106667, 
    [ 40] =   184615,     [ 41] =   166154,     [ 42] =    88889,     [ 43] =    80000, 
    [ 48] =   164103,     [ 49] =   147692,     [ 50] =    79012,     [ 51] =    71111, 
    [ 56] =   147692,     [ 57] =   132923,     [ 58] =    71111,     [ 59] =    64000, 
    [ 64] =   123077,     [ 65] =   110769,     [ 66] =    59259,     [ 67] =    53333, 
    [ 72] =   110769,     [ 73] =    99692,     [ 74] =    53333,     [ 75] =    48000, 
    
    [  4] =   328205,     [  5] =   295385,     [  6] =   164103,     [  7] =   147692, 
    [ 12] =   164103,     [ 13] =   147692,     [ 14] =    82051,     [ 15] =    73846, 
    [ 20] =   109402,     [ 21] =    98462,     [ 22] =    54701,     [ 23] =    49231, 
    [ 28] =    82051,     [ 29] =    73846,     [ 30] =    41026,     [ 31] =    36923, 
    [ 36] =    54701,     [ 37] =    49231,     [ 38] =    27350,     [ 39] =    24615, 
    [ 44] =    41026,     [ 45] =    36923,     [ 46] =    20513,     [ 47] =    18462, 
    [ 52] =    36467,     [ 53] =    32821,     [ 54] =    18234,     [ 55] =    16410, 
    [ 60] =    32821,     [ 61] =    29538,     [ 62] =    16410,     [ 63] =    14769, 
    [ 68] =    27350,     [ 69] =    24615,     [ 70] =    13675,     [ 71] =    12308, 
    [ 76] =    24615,     [ 77] =    22154,     [ 78] =    12308,     [ 79] =    11077, 
}

Transmission duration in nsecs of 1200 bytes for a HT/VHT MCS.

Index of the table is (MCS_IDX << 3) | (BW << 1) | (GI_400) where BW is 0 for 20 MHz, 1 for 40MHz and 2 for 80MHz GI_400 is 1 if packet is being sent with 400ns GI, 0 if 800ns GI

Definition at line 46 of file rc.c.

const uint32_t rc_duration_non_ht[8] [static]

Initial value:

{
                      
    [  0] =  1600000, 
    [  1] =  1068000, 
    [  2] =   800000, 
    [  3] =   536000, 
    [  4] =   400000, 
    [  5] =   268000, 
    [  6] =   200000, 
    [  7] =   180000, 
}

Transmission duration in nsecs of 1200 bytes.

Index of the table is (MCS_IDX - 4)

Definition at line 190 of file rc.c.

RC [UMAC]

Data Structures

Defines

Functions

Variables

RC information flags

RC control information inside TX descriptor

RC trial states

Detailed Description

Define Documentation

Function Documentation

Variable Documentation

RC
[UMAC]