/*
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 02110-1301 USA.
*
* File: datarate.c
*
* Purpose: Handles the auto fallback & data rates functions
*
* Author: Lyndon Chen
*
* Date: July 17, 2002
*
* Functions:
* RATEvParseMaxRate - Parsing the highest basic & support rate in rate field of frame
* RATEvTxRateFallBack - Rate fallback Algorithm Implementaion
* RATEuSetIE- Set rate IE field.
*
* Revision History:
*
*/
#include "ttype.h"
#include "tmacro.h"
#include "mac.h"
#include "80211mgr.h"
#include "bssdb.h"
#include "datarate.h"
#include "card.h"
#include "baseband.h"
#include "srom.h"
/*--------------------- Static Definitions -------------------------*/
/*--------------------- Static Classes ----------------------------*/
extern unsigned short TxRate_iwconfig; //2008-5-8 <add> by chester
/*--------------------- Static Variables --------------------------*/
//static int msglevel =MSG_LEVEL_DEBUG;
static int msglevel =MSG_LEVEL_INFO;
const unsigned char acbyIERate[MAX_RATE] =
{0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18, 0x24, 0x30, 0x48, 0x60, 0x6C};
#define AUTORATE_TXOK_CNT 0x0400
#define AUTORATE_TXFAIL_CNT 0x0064
#define AUTORATE_TIMEOUT 10
/*--------------------- Static Functions --------------------------*/
void s_vResetCounter (
PKnownNodeDB psNodeDBTable
);
void
s_vResetCounter (
PKnownNodeDB psNodeDBTable
)
{
unsigned char ii;
// clear statistic counter for auto_rate
for(ii=0;ii<=MAX_RATE;ii++) {
psNodeDBTable->uTxOk[ii] = 0;
psNodeDBTable->uTxFail[ii] = 0;
}
}
/*--------------------- Export Variables --------------------------*/
/*--------------------- Export Functions --------------------------*/
/*+
*
* Description:
* Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
*
* Parameters:
* In:
* unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
* Out:
* none
*
* Return Value: RateIdx
*
-*/
unsigned char
DATARATEbyGetRateIdx (
unsigned char byRate
)
{
unsigned char ii;
//Erase basicRate flag.
byRate = byRate & 0x7F;//0111 1111
for (ii = 0; ii < MAX_RATE; ii ++) {
if (acbyIERate[ii] == byRate)
return ii;
}
return 0;
}
/*+
*
* Routine Description:
* Rate fallback Algorithm Implementaion
*
* Parameters:
* In:
* pDevice - Pointer to the adapter
* psNodeDBTable - Pointer to Node Data Base
* Out:
* none
*
* Return Value: none
*
-*/
#define AUTORATE_TXCNT_THRESHOLD 20
#define AUTORATE_INC_THRESHOLD 30
/*+
*
* Description:
* Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
*
* Parameters:
* In:
* unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
* Out:
* none
*
* Return Value: RateIdx
*
-*/
unsigned short
wGetRateIdx(
unsigned char byRate
)
{
unsigned short ii;
//Erase basicRate flag.
byRate = byRate & 0x7F;//0111 1111
for (ii = 0; ii < MAX_RATE; ii ++) {
if (acbyIERate[ii] == byRate)
return ii;
}
return 0;
}
/*+
*
* Description:
* Parsing the highest basic & support rate in rate field of frame.
*
* Parameters:
* In:
* pDevice - Pointer to the adapter
* pItemRates - Pointer to Rate field defined in 802.11 spec.
* pItemExtRates - Pointer to Extended Rate field defined in 802.11 spec.
* Out:
* pwMaxBasicRate - Maximum Basic Rate
* pwMaxSuppRate - Maximum Supported Rate
* pbyTopCCKRate - Maximum Basic Rate in CCK mode
* pbyTopOFDMRate - Maximum Basic Rate in OFDM mode
*
* Return Value: none
*
-*/
void
RATEvParseMaxRate (
void *pDeviceHandler,
PWLAN_IE_SUPP_RATES pItemRates,
PWLAN_IE_SUPP_RATES pItemExtRates,
bool bUpdateBasicRate,
unsigned short *pwMaxBasicRate,
unsigned short *pwMaxSuppRate,
unsigned short *pwSuppRate,
unsigned char *pbyTopCCKRate,
unsigned char *pbyTopOFDMRate
)
{
PSDevice pDevice = (PSDevice) pDeviceHandler;
unsigned int ii;
unsigned char byHighSuppRate = 0;
unsigned char byRate = 0;
unsigned short wOldBasicRate = pDevice->wBasicRate;
unsigned int uRateLen;
if (pItemRates == NULL)
return;
*pwSuppRate = 0;
uRateLen = pItemRates->len;
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate Len: %d\n", uRateLen);
if (pDevice->eCurrentPHYType != PHY_TYPE_11B) {
if (uRateLen > WLAN_RATES_MAXLEN)
uRateLen = WLAN_RATES_MAXLEN;
} else {
if (uRateLen > WLAN_RATES_MAXLEN_11B)
uRateLen = WLAN_RATES_MAXLEN_11B;
}
for (ii = 0; ii < uRateLen; ii++) {
byRate = (unsigned char)(pItemRates->abyRates[ii]);
if (WLAN_MGMT_IS_BASICRATE(byRate) &&
(bUpdateBasicRate == true)) {
// Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate
CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
}
byRate = (unsigned char)(pItemRates->abyRates[ii]&0x7F);
if (byHighSuppRate == 0)
byHighSuppRate = byRate;
if (byRate > byHighSuppRate)
byHighSuppRate = byRate;
*pwSuppRate |= (1<<wGetRateIdx(byRate));
}
if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
(pDevice->eCurrentPHYType != PHY_TYPE_11B)) {
unsigned int uExtRateLen = pItemExtRates->len;
if (uExtRateLen > WLAN_RATES_MAXLEN)
uExtRateLen = WLAN_RATES_MAXLEN;
for (ii = 0; ii < uExtRateLen ; ii++) {
byRate = (unsigned char)(pItemExtRates->abyRates[ii]);
// select highest basic rate
if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
// Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate
CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
}
byRate = (unsigned char)(pItemExtRates->abyRates[ii]&0x7F);
if (byHighSuppRate == 0)
byHighSuppRate = byRate;
if (byRate > byHighSuppRate)
byHighSuppRate = byRate;
*pwSuppRate |= (1<<wGetRateIdx(byRate));
//DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n", wGetRateIdx(byRate), byRate));
}
} //if(pItemExtRates != NULL)
if ((pDevice->byPacketType == PK_TYPE_11GB) && CARDbIsOFDMinBasicRate((void *)pDevice)) {
pDevice->byPacketType = PK_TYPE_11GA;
}
*pbyTopCCKRate = pDevice->byTopCCKBasicRate;
*pbyTopOFDMRate = pDevice->byTopOFDMBasicRate;
*pwMaxSuppRate = wGetRateIdx(byHighSuppRate);
if ((pDevice->byPacketType==PK_TYPE_11B) || (pDevice->byPacketType==PK_TYPE_11GB))
*pwMaxBasicRate = pDevice->byTopCCKBasicRate;
else
*pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
if (wOldBasicRate != pDevice->wBasicRate)
CARDvSetRSPINF((void *)pDevice, pDevice->eCurrentPHYType);
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Exit ParseMaxRate\n");
}
/*+
*
* Routine Description:
* Rate fallback Algorithm Implementaion
*
* Parameters:
* In:
* pDevice - Pointer to the adapter
* psNodeDBTable - Pointer to Node Data Base
* Out:
* none
*
* Return Value: none
*
-*/
#define AUTORATE_TXCNT_THRESHOLD 20
#define AUTORATE_INC_THRESHOLD 30
void
RATEvTxRateFallBack (
void *pDeviceHandler,
PKnownNodeDB psNodeDBTable
)
{
PSDevice pDevice = (PSDevice) pDeviceHandler;
unsigned short wIdxDownRate = 0;
unsigned int ii;
//unsigned long dwRateTable[MAX_RATE] = {1, 2, 5, 11, 6, 9, 12, 18, 24, 36, 48, 54};
bool bAutoRate[MAX_RATE] = {true,true,true,true,false,false,true,true,true,true,true,true};
unsigned long dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180, 240, 360, 480, 540};
unsigned long dwThroughput = 0;
unsigned short wIdxUpRate = 0;
unsigned long dwTxDiff = 0;
if (pDevice->pMgmt->eScanState != WMAC_NO_SCANNING) {
// Don't do Fallback when scanning Channel
return;
}
psNodeDBTable->uTimeCount ++;
if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
(dwTxDiff < AUTORATE_TXFAIL_CNT) &&
(psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
return;
}
if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT) {
psNodeDBTable->uTimeCount = 0;
}
for(ii=0;ii<MAX_RATE;ii++) {
if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
if (bAutoRate[ii] == true) {
wIdxUpRate = (unsigned short) ii;
}
} else {
bAutoRate[ii] = false;
}
}
for(ii=0;ii<=psNodeDBTable->wTxDataRate;ii++) {
if ( (psNodeDBTable->uTxOk[ii] != 0) ||
(psNodeDBTable->uTxFail[ii] != 0) ) {
dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
if (ii < RATE_11M) {
psNodeDBTable->uTxFail[ii] *= 4;
}
dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
}
// DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate %d,Ok: %d, Fail:%d, Throughput:%d\n",
// ii, psNodeDBTable->uTxOk[ii], psNodeDBTable->uTxFail[ii], dwThroughputTbl[ii]);
}
dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
wIdxDownRate = psNodeDBTable->wTxDataRate;
for(ii = psNodeDBTable->wTxDataRate; ii > 0;) {
ii--;
if ( (dwThroughputTbl[ii] > dwThroughput) &&
(bAutoRate[ii]==true) ) {
dwThroughput = dwThroughputTbl[ii];
wIdxDownRate = (unsigned short) ii;
}
}
psNodeDBTable->wTxDataRate = wIdxDownRate;
if (psNodeDBTable->uTxOk[MAX_RATE]) {
if (psNodeDBTable->uTxOk[MAX_RATE] >
(psNodeDBTable->uTxFail[MAX_RATE] * 4) ) {
psNodeDBTable->wTxDataRate = wIdxUpRate;
}
}else { // adhoc, if uTxOk =0 & uTxFail = 0
if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
psNodeDBTable->wTxDataRate = wIdxUpRate;
}
//2008-5-8 <add> by chester
TxRate_iwconfig=psNodeDBTable->wTxDataRate;
s_vResetCounter(psNodeDBTable);
// DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate: %d, U:%d, D:%d\n", psNodeDBTable->wTxDataRate, wIdxUpRate, wIdxDownRate);
return;
}
/*+
*
* Description:
* This routine is used to assemble available Rate IE.
*
* Parameters:
* In:
* pDevice
* Out:
*
* Return Value: None
*
-*/
unsigned char
RATEuSetIE (
PWLAN_IE_SUPP_RATES pSrcRates,
PWLAN_IE_SUPP_RATES pDstRates,
unsigned int uRateLen
)
{
unsigned int ii, uu, uRateCnt = 0;
if ((pSrcRates == NULL) || (pDstRates == NULL))
return 0;
if (pSrcRates->len == 0)
return 0;
for (ii = 0; ii < uRateLen; ii++) {
for (uu = 0; uu < pSrcRates->len; uu++) {
if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
pDstRates->abyRates[uRateCnt ++] = pSrcRates->abyRates[uu];
break;
}
}
}
return (unsigned char)uRateCnt;
}