path: root/drivers/misc/mediatek/connectivity/wlan/gen2/mgmt/rate.c

/*
** Id: //Department/DaVinci/BRANCHES/MT6620_WIFI_DRIVER_V2_3/mgmt/rate.c#1
*/

/*! \file   "rate.c"
    \brief  This file contains the transmission rate handling routines.

    This file contains the transmission rate handling routines for setting up
    ACK/CTS Rate, Highest Tx Rate, Lowest Tx Rate, Initial Tx Rate and do
    conversion between Rate Set and Data Rates.
*/

/*
** Log: rate.c
 *
 * 07 08 2010 cp.wu
 *
 * [WPD00003833] [MT6620 and MT5931] Driver migration - move to new repository.
 *
 * 06 08 2010 cp.wu
 * [WPD00003833][MT6620 and MT5931] Driver migration
 * add rate.c.
 *
 * 03 16 2010 kevin.huang
 * [BORA00000663][WIFISYS][New Feature] AdHoc Mode Support
 * Add AdHoc Mode
 *
 * 12 18 2009 cm.chang
 * [BORA00000018]Integrate WIFI part into BORA for the 1st time
 * .
 *
 * Nov 23 2009 mtk01461
 * [BORA00000018] Integrate WIFI part into BORA for the 1st time
 * Update comments
 *
 * Nov 16 2009 mtk01461
 * [BORA00000018] Integrate WIFI part into BORA for the 1st time
 * Fix DBGLOG
 *
 * Nov 5 2009 mtk01461
 * [BORA00000018] Integrate WIFI part into BORA for the 1st time
 *
**  \main\maintrunk.MT5921\12 2008-12-19 17:19:32 GMT mtk01461
**  Fix the problem that do not ASSERT the length of Supported Rate IE == 8
**  \main\maintrunk.MT5921\11 2008-12-01 18:17:42 GMT mtk01088
**  fixed the lint "possible using null pointer" warning
**  \main\maintrunk.MT5921\10 2008-08-20 00:16:36 GMT mtk01461
**  Update for Driver Review
**  \main\maintrunk.MT5921\9 2008-04-13 21:17:13 GMT mtk01461
**  Revise GEN Link Speed OID
**  \main\maintrunk.MT5921\8 2008-03-28 10:40:13 GMT mtk01461
**  Add rateGetRateSetFromDataRates() for set desired rate OID
**  \main\maintrunk.MT5921\7 2008-03-26 09:16:20 GMT mtk01461
**  Add adopt operational rate as ACK rate if BasicRateSet was not found
**  Add comments
**  \main\maintrunk.MT5921\6 2008-02-21 15:01:39 GMT mtk01461
**  Add initial rate according rx signal quality support
**  \main\maintrunk.MT5921\5 2008-01-07 15:06:44 GMT mtk01461
**  Fix typo of rate adaptation of CtrlResp Frame
**  \main\maintrunk.MT5921\4 2007-10-25 18:05:12 GMT mtk01461
**  Add VOIP SCAN Support  & Refine Roaming
*/

/*******************************************************************************
*                         C O M P I L E R   F L A G S
********************************************************************************
*/

/*******************************************************************************
*                    E X T E R N A L   R E F E R E N C E S
********************************************************************************
*/
#include "precomp.h"

/*******************************************************************************
*                              C O N S T A N T S
********************************************************************************
*/
/* The list of valid data rates. */
const UINT_8 aucDataRate[] = {
	RATE_1M,		/* RATE_1M_INDEX = 0 */
	RATE_2M,		/* RATE_2M_INDEX */
	RATE_5_5M,		/* RATE_5_5M_INDEX */
	RATE_11M,		/* RATE_11M_INDEX */
	RATE_22M,		/* RATE_22M_INDEX */
	RATE_33M,		/* RATE_33M_INDEX */
	RATE_6M,		/* RATE_6M_INDEX */
	RATE_9M,		/* RATE_9M_INDEX */
	RATE_12M,		/* RATE_12M_INDEX */
	RATE_18M,		/* RATE_18M_INDEX */
	RATE_24M,		/* RATE_24M_INDEX */
	RATE_36M,		/* RATE_36M_INDEX */
	RATE_48M,		/* RATE_48M_INDEX */
	RATE_54M,		/* RATE_54M_INDEX */
	RATE_HT_PHY		/* RATE_HT_PHY_INDEX */
};

static const UINT_8 aucDefaultAckCtsRateIndex[RATE_NUM] = {
	RATE_1M_INDEX,		/* RATE_1M_INDEX = 0 */
	RATE_2M_INDEX,		/* RATE_2M_INDEX */
	RATE_5_5M_INDEX,	/* RATE_5_5M_INDEX */
	RATE_11M_INDEX,		/* RATE_11M_INDEX */
	RATE_1M_INDEX,		/* RATE_22M_INDEX - Not supported */
	RATE_1M_INDEX,		/* RATE_33M_INDEX - Not supported */
	RATE_6M_INDEX,		/* RATE_6M_INDEX */
	RATE_6M_INDEX,		/* RATE_9M_INDEX */
	RATE_12M_INDEX,		/* RATE_12M_INDEX */
	RATE_12M_INDEX,		/* RATE_18M_INDEX */
	RATE_24M_INDEX,		/* RATE_24M_INDEX */
	RATE_24M_INDEX,		/* RATE_36M_INDEX */
	RATE_24M_INDEX,		/* RATE_48M_INDEX */
	RATE_24M_INDEX		/* RATE_54M_INDEX */
};

const BOOLEAN afgIsOFDMRate[RATE_NUM] = {
	FALSE,			/* RATE_1M_INDEX = 0 */
	FALSE,			/* RATE_2M_INDEX */
	FALSE,			/* RATE_5_5M_INDEX */
	FALSE,			/* RATE_11M_INDEX */
	FALSE,			/* RATE_22M_INDEX - Not supported */
	FALSE,			/* RATE_33M_INDEX - Not supported */
	TRUE,			/* RATE_6M_INDEX */
	TRUE,			/* RATE_9M_INDEX */
	TRUE,			/* RATE_12M_INDEX */
	TRUE,			/* RATE_18M_INDEX */
	TRUE,			/* RATE_24M_INDEX */
	TRUE,			/* RATE_36M_INDEX */
	TRUE,			/* RATE_48M_INDEX */
	TRUE			/* RATE_54M_INDEX */
};

/*******************************************************************************
*                             D A T A   T Y P E S
********************************************************************************
*/

/*******************************************************************************
*                            P U B L I C   D A T A
********************************************************************************
*/

/*******************************************************************************
*                           P R I V A T E   D A T A
********************************************************************************
*/

/*******************************************************************************
*                                 M A C R O S
********************************************************************************
*/

/*******************************************************************************
*                   F U N C T I O N   D E C L A R A T I O N S
********************************************************************************
*/

/*******************************************************************************
*                              F U N C T I O N S
********************************************************************************
*/
/*----------------------------------------------------------------------------*/
/*!
* @brief Convert the given Supported Rate & Extended Supported Rate IE to the
*        Operational Rate Set and Basic Rate Set, and also check if any Basic
*        Rate Code is unknown by driver.
*
* @param[in] prIeSupportedRate          Pointer to the Supported Rate IE
* @param[in] prIeExtSupportedRate       Pointer to the Ext Supported Rate IE
* @param[out] pu2OperationalRateSet     Pointer to the Operational Rate Set
* @param[out] pu2BSSBasicRateSet        Pointer to the Basic Rate Set
* @param[out] pfgIsUnknownBSSBasicRate  Pointer to a Flag to indicate that Basic
*                                       Rate Set has unknown Rate Code
*
* \return (none)
*/
/*----------------------------------------------------------------------------*/
VOID
rateGetRateSetFromIEs(IN P_IE_SUPPORTED_RATE_T prIeSupportedRate,
		      IN P_IE_EXT_SUPPORTED_RATE_T prIeExtSupportedRate,
		      OUT PUINT_16 pu2OperationalRateSet,
		      OUT PUINT_16 pu2BSSBasicRateSet, OUT PBOOLEAN pfgIsUnknownBSSBasicRate)
{
	UINT_16 u2OperationalRateSet = 0;
	UINT_16 u2BSSBasicRateSet = 0;
	BOOLEAN fgIsUnknownBSSBasicRate = FALSE;
	UINT_8 ucRate;
	UINT_32 i, j;

	ASSERT(pu2OperationalRateSet);
	ASSERT(pu2BSSBasicRateSet);
	ASSERT(pfgIsUnknownBSSBasicRate);

	if (prIeSupportedRate) {
		/* NOTE(Kevin): Buffalo WHR-G54S's supported rate set IE exceed 8.
		 * IE_LEN(pucIE) == 12, "1(B), 2(B), 5.5(B), 6(B), 9(B), 11(B),
		 * 12(B), 18(B), 24(B), 36(B), 48(B), 54(B)"
		 */
		/* ASSERT(prIeSupportedRate->ucLength <= ELEM_MAX_LEN_SUP_RATES); */
		ASSERT(prIeSupportedRate->ucLength <= RATE_NUM);

		for (i = 0; i < prIeSupportedRate->ucLength; i++) {
			ucRate = prIeSupportedRate->aucSupportedRates[i] & RATE_MASK;

			/* Search all valid data rates */
			for (j = 0; j < sizeof(aucDataRate) / sizeof(UINT_8); j++) {
				if (ucRate == aucDataRate[j]) {
					u2OperationalRateSet |= BIT(j);

					if (prIeSupportedRate->aucSupportedRates[i] & RATE_BASIC_BIT)
						u2BSSBasicRateSet |= BIT(j);

					break;
				}
			}

			if ((j == sizeof(aucDataRate) / sizeof(UINT_8)) &&
			    (prIeSupportedRate->aucSupportedRates[i] & RATE_BASIC_BIT)) {
				fgIsUnknownBSSBasicRate = TRUE;	/* A data rate not list in the aucDataRate[] */
			}
		}
	}

	if (prIeExtSupportedRate) {
		/* ASSERT(prIeExtSupportedRate->ucLength <= ELEM_MAX_LEN_EXTENDED_SUP_RATES); */

		for (i = 0; i < prIeExtSupportedRate->ucLength; i++) {
			ucRate = prIeExtSupportedRate->aucExtSupportedRates[i] & RATE_MASK;

			/* Search all valid data rates */
			for (j = 0; j < sizeof(aucDataRate) / sizeof(UINT_8); j++) {
				if (ucRate == aucDataRate[j]) {
					u2OperationalRateSet |= BIT(j);

					if (prIeExtSupportedRate->aucExtSupportedRates[i] & RATE_BASIC_BIT)
						u2BSSBasicRateSet |= BIT(j);

					break;
				}
			}

			if ((j == sizeof(aucDataRate) / sizeof(UINT_8)) &&
			    (prIeExtSupportedRate->aucExtSupportedRates[i] & RATE_BASIC_BIT)) {
				fgIsUnknownBSSBasicRate = TRUE;	/* A data rate not list in the aucDataRate[] */
			}
		}
	}

	*pu2OperationalRateSet = u2OperationalRateSet;
	*pu2BSSBasicRateSet = u2BSSBasicRateSet;
	*pfgIsUnknownBSSBasicRate = fgIsUnknownBSSBasicRate;

	return;

}				/* end of rateGetRateSetFromIEs() */

/*----------------------------------------------------------------------------*/
/*!
* @brief Convert the given Operational Rate Set & Basic Rate Set to the Rate Code
*        Format for used in (Ext)Supportec Rate IE.
*
* @param[in] u2OperationalRateSet   Operational Rate Set
* @param[in] u2BSSBasicRateSet      Basic Rate Set
* @param[out] pucDataRates          Pointer to the Data Rate Buffer
* @param[out] pucDataRatesLen       Pointer to the Data Rate Buffer Length
*
* @return (none)
*/
/*----------------------------------------------------------------------------*/
VOID
rateGetDataRatesFromRateSet(IN UINT_16 u2OperationalRateSet,
			    IN UINT_16 u2BSSBasicRateSet, OUT PUINT_8 pucDataRates, OUT PUINT_8 pucDataRatesLen)
{
	UINT_32 i, j;

	ASSERT(pucDataRates);
	ASSERT(pucDataRatesLen);

	ASSERT(u2BSSBasicRateSet == (u2OperationalRateSet & u2BSSBasicRateSet));

	for (i = RATE_1M_INDEX, j = 0; i < RATE_NUM; i++) {
		if (u2OperationalRateSet & BIT(i)) {

			*(pucDataRates + j) = aucDataRate[i];

			if (u2BSSBasicRateSet & BIT(i))
				*(pucDataRates + j) |= RATE_BASIC_BIT;

			j++;
		}
	}

	*pucDataRatesLen = (UINT_8) j;

	return;

}				/* end of rateGetDataRatesFromRateSet() */

/*----------------------------------------------------------------------------*/
/*!
* \brief Get the highest rate from given Rate Set.
*
* \param[in] u2RateSet              Rate Set
* \param[out] pucHighestRateIndex   Pointer to buffer of the Highest Rate Index
*
* \retval TRUE  Highest Rate Index was found
* \retval FALSE Highest Rate Index was not found
*/
/*----------------------------------------------------------------------------*/
BOOLEAN rateGetHighestRateIndexFromRateSet(IN UINT_16 u2RateSet, OUT PUINT_8 pucHighestRateIndex)
{
	INT_32 i;

	ASSERT(pucHighestRateIndex);

	for (i = RATE_54M_INDEX; i >= RATE_1M_INDEX; i--) {
		if (u2RateSet & BIT(i)) {
			*pucHighestRateIndex = (UINT_8) i;
			return TRUE;
		}
	}

	return FALSE;

}				/* end of rateGetHighestRateIndexFromRateSet() */

/*----------------------------------------------------------------------------*/
/*!
* \brief Get the lowest rate from given Rate Set.
*
* \param[in] u2RateSet              Rate Set
* \param[out] pucLowestRateIndex    Pointer to buffer of the Lowest Rate Index
*
* \retval TRUE  Lowest Rate Index was found
* \retval FALSE Lowest Rate Index was not found
*/
/*----------------------------------------------------------------------------*/
BOOLEAN rateGetLowestRateIndexFromRateSet(IN UINT_16 u2RateSet, OUT PUINT_8 pucLowestRateIndex)
{
	UINT_32 i;

	ASSERT(pucLowestRateIndex);

	for (i = RATE_1M_INDEX; i <= RATE_54M_INDEX; i++) {
		if (u2RateSet & BIT(i)) {
			*pucLowestRateIndex = (UINT_8) i;
			return TRUE;
		}
	}

	return FALSE;

}				/* end of rateGetLowestRateIndexFromRateSet() */

#if 0				/* NOTE(Kevin): For reference */
/*----------------------------------------------------------------------------*/
/*!
* \brief Convert the given Data Rates to the Rate Set.
*
* \param[in] pucDataRates       Pointer to the Data Rates
* \param[in] ucDataRatesLen     Length of given Data Rates
* \param[out] pu2RateSet        Pointer to the Rate Set
*
* \return (none)
*/
/*----------------------------------------------------------------------------*/
VOID rateGetRateSetFromDataRates(IN PUINT_8 pucDataRates, IN UINT_8 ucDataRatesLen, OUT PUINT_16 pu2RateSet)
{
	UINT_16 u2RateSet = 0;
	UINT_8 ucRate;
	UINT_32 i, j;

	ASSERT(pucDataRates);
	ASSERT(pu2RateSet);

	if (pucDataRates) {
		for (i = 0; i < ucDataRatesLen; i++) {
			ucRate = pucDataRates[i] & RATE_MASK;

			/* Search all valid data rates */
			for (j = 0; j < sizeof(aucDataRate) / sizeof(UINT_8); j++) {
				if (ucRate == aucDataRate[j]) {
					u2RateSet |= BIT(j);
					break;
				}
			}
		}
	}

	*pu2RateSet = u2RateSet;

	return;

}				/* end of rateGetRateSetFromDataRates() */

/*----------------------------------------------------------------------------*/
/*!
* \brief Parse the Operational Rate Set and Basic Rate Set to get the corresponding
*        ACK/CTS(Respnose) TX Rates.
*
* \param[in] u2OperationalRateSet   Operational Rate Set
* \param[in] u2BSSBasicRateSet      Basic Rate Set
* \param[out] aucAckCtsRateIndex    Pointer to the Ack/Cts Data Rate Buffer
*
* \return (none)
*/
/*----------------------------------------------------------------------------*/
VOID
rateSetAckCtsDataRatesFromRateSet(IN UINT_16 u2OperationalRateSet,
				  IN UINT_16 u2BSSBasicRateSet, IN OUT UINT_8 aucAckCtsRateIndex[])
{
	INT_32 i, j;

	ASSERT(aucAckCtsRateIndex);
	ASSERT(u2BSSBasicRateSet == (u2OperationalRateSet & u2BSSBasicRateSet));

	/* Setup default ACK/CTS response rate */
	kalMemCopy(aucAckCtsRateIndex, (PVOID) aucDefaultAckCtsRateIndex, sizeof(aucDefaultAckCtsRateIndex));

	for (i = RATE_54M_INDEX; i >= RATE_1M_INDEX; i--) {
		if (u2OperationalRateSet & BIT(i)) {
			for (j = i; j >= RATE_1M_INDEX; j--) {
				if (u2BSSBasicRateSet & BIT(j)) {
					/* Reply ACK Frame at the same Modulation Scheme. */
					if ((afgIsOFDMRate[i] && afgIsOFDMRate[j]) ||
					    (!afgIsOFDMRate[i] && !afgIsOFDMRate[j]))
						aucAckCtsRateIndex[i] = (UINT_8) j;
					break;
				}
			}

			/* NOTE(Kevin 2008/03/25): Following code is used for those AP which has
			 * NULL BasicRateSet.
			 * e.g. If input Operational Rate Set = [18M 12M 9M], Basic Rate Set = NULL.
			 * Originally we'll get Ack Rate for [18M 12M 9M] is [12M 12M "6M"].
			 * Now we'll get Ack Rate for [18M 12M 9M] is [12M 12M 9M],
			 * The Ack Rate for Tx Rates which are not list in Operational Rate Set is still
			 * use highest mandatory rate as default.
			 */
			if (j < RATE_1M_INDEX) {	/* The ACK/CTS rate was not found in BasicRateSet */
				if (!(BIT(aucAckCtsRateIndex[i]) & u2OperationalRateSet))
					aucAckCtsRateIndex[i] = (UINT_8) i;
			}
		}
	}

	return;

}				/* end of rateSetAckCtsDataRatesFromRateSet() */

/*----------------------------------------------------------------------------*/
/*!
* \brief Get the proper initial rate from Rate Set according to given RCPI value
*
* \param[in] u2RateSet              Rate Set
* \param[in] rRcpi                  RCPI value from AP or Peer STA
* \param[out] pucInitialRateIndex   Pointer to buffer of the initial Rate Index
*
* \retval TRUE  Initial Rate Index was found
* \retval FALSE Initial Rate Index was not found
*/
/*----------------------------------------------------------------------------*/
BOOLEAN rateGetBestInitialRateIndex(IN UINT_16 u2RateSet, IN RCPI rRcpi, OUT PUINT_8 pucInitialRateIndex)
{
	UINT_16 u2InitRateSet;
	INT_32 i;

	ASSERT(pucInitialRateIndex);

	DBGLOG(MGT, TRACE, "rRcpi = %d\n", rRcpi);

	if (rRcpi >= RCPI_100) {	/* Best Signal */
		u2InitRateSet = INITIAL_RATE_SET(RCPI_100);
	} else if (rRcpi >= RCPI_80) {	/* Better Signal */
		u2InitRateSet = INITIAL_RATE_SET(RCPI_80);
	} else if (rRcpi >= RCPI_60) {	/* Good Signal */
		u2InitRateSet = INITIAL_RATE_SET(RCPI_60);
	} else {		/* Worse Signal */
		/* NOTE(Kevin): If return FALSE, we should assign the BSS Basic Rate Index
		 * (prBssInfo->ucBasicRateIndex) to the initial rate. It was determined in
		 * function - bssUpdateTxRateForControlFrame().
		 */
		return FALSE;
	}

	u2RateSet &= u2InitRateSet;

	for (i = RATE_54M_INDEX; i >= RATE_1M_INDEX; i--) {
		if (u2RateSet & BIT(i)) {
			*pucInitialRateIndex = (UINT_8) i;
			return TRUE;
		}
	}

	return FALSE;

}				/* end of rateGetBestInitialRateIndex() */
#endif