drivers/staging/vt6655/datarate.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * File: datarate.c
  20  *
  21  * Purpose: Handles the auto fallback & data rates functions
  22  *
  23  * Author: Lyndon Chen
  24  *
  25  * Date: July 17, 2002
  26  *
  27  * Functions:
  28  *      RATEvParseMaxRate - Parsing the highest basic & support rate in rate field of frame
  29  *      RATEvTxRateFallBack - Rate fallback Algorithm Implementaion
  30  *      RATEuSetIE- Set rate IE field.
  31  *
  32  * Revision History:
  33  *
  34  */
  35
  36 #include "ttype.h"
  37 #include "tmacro.h"
  38 #include "mac.h"
  39 #include "80211mgr.h"
  40 #include "bssdb.h"
  41 #include "datarate.h"
  42 #include "card.h"
  43 #include "baseband.h"
  44 #include "srom.h"
  45
  46 /*---------------------  Static Definitions -------------------------*/
  47
  48
  49
  50
  51 /*---------------------  Static Classes  ----------------------------*/
  52
  53
  54  extern unsigned short TxRate_iwconfig; //2008-5-8 <add> by chester
  55 /*---------------------  Static Variables  --------------------------*/
  56 //static int          msglevel                =MSG_LEVEL_DEBUG;
  57 static int          msglevel                =MSG_LEVEL_INFO;
  58 const unsigned char acbyIERate[MAX_RATE] =
  59 {0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18, 0x24, 0x30, 0x48, 0x60, 0x6C};
  60
  61 #define AUTORATE_TXOK_CNT       0x0400
  62 #define AUTORATE_TXFAIL_CNT     0x0064
  63 #define AUTORATE_TIMEOUT        10
  64
  65 /*---------------------  Static Functions  --------------------------*/
  66
  67 void s_vResetCounter (
  68     PKnownNodeDB psNodeDBTable
  69     );
  70
  71
  72
  73 void
  74 s_vResetCounter (
  75     PKnownNodeDB psNodeDBTable
  76     )
  77 {
  78     unsigned char ii;
  79
  80     // clear statistic counter for auto_rate
  81     for(ii=0;ii<=MAX_RATE;ii++) {
  82         psNodeDBTable->uTxOk[ii] = 0;
  83         psNodeDBTable->uTxFail[ii] = 0;
  84     }
  85 }
  86
  87 /*---------------------  Export Variables  --------------------------*/
  88
  89
  90 /*---------------------  Export Functions  --------------------------*/
  91
  92
  93 /*+
  94  *
  95  * Description:
  96  *      Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
  97  *
  98  * Parameters:
  99  *  In:
 100  *      unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
 101  *  Out:
 102  *      none
 103  *
 104  * Return Value: RateIdx
 105  *
 106 -*/
 107 unsigned char
 108 DATARATEbyGetRateIdx (
 109     unsigned char byRate
 110     )
 111 {
 112     unsigned char ii;
 113
 114     //Erase basicRate flag.
 115     byRate = byRate & 0x7F;//0111 1111
 116
 117     for (ii = 0; ii < MAX_RATE; ii ++) {
 118         if (acbyIERate[ii] == byRate)
 119             return ii;
 120     }
 121     return 0;
 122 }
 123
 124
 125
 126 /*+
 127  *
 128  * Routine Description:
 129  *      Rate fallback Algorithm Implementaion
 130  *
 131  * Parameters:
 132  *  In:
 133  *      pDevice         - Pointer to the adapter
 134  *      psNodeDBTable   - Pointer to Node Data Base
 135  *  Out:
 136  *      none
 137  *
 138  * Return Value: none
 139  *
 140 -*/
 141 #define AUTORATE_TXCNT_THRESHOLD        20
 142 #define AUTORATE_INC_THRESHOLD          30
 143
 144
 145
 146
 147 /*+
 148  *
 149  * Description:
 150  *      Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
 151  *
 152  * Parameters:
 153  *  In:
 154  *      unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
 155  *  Out:
 156  *      none
 157  *
 158  * Return Value: RateIdx
 159  *
 160 -*/
 161 unsigned short
 162 wGetRateIdx(
 163     unsigned char byRate
 164     )
 165 {
 166     unsigned short ii;
 167
 168     //Erase basicRate flag.
 169     byRate = byRate & 0x7F;//0111 1111
 170
 171     for (ii = 0; ii < MAX_RATE; ii ++) {
 172         if (acbyIERate[ii] == byRate)
 173             return ii;
 174     }
 175     return 0;
 176 }
 177
 178 /*+
 179  *
 180  * Description:
 181  *      Parsing the highest basic & support rate in rate field of frame.
 182  *
 183  * Parameters:
 184  *  In:
 185  *      pDevice         - Pointer to the adapter
 186  *      pItemRates      - Pointer to Rate field defined in 802.11 spec.
 187  *      pItemExtRates      - Pointer to Extended Rate field defined in 802.11 spec.
 188  *  Out:
 189  *      pwMaxBasicRate  - Maximum Basic Rate
 190  *      pwMaxSuppRate   - Maximum Supported Rate
 191  *      pbyTopCCKRate   - Maximum Basic Rate in CCK mode
 192  *      pbyTopOFDMRate  - Maximum Basic Rate in OFDM mode
 193  *
 194  * Return Value: none
 195  *
 196 -*/
 197 void
 198 RATEvParseMaxRate (
 199     void *pDeviceHandler,
 200     PWLAN_IE_SUPP_RATES pItemRates,
 201     PWLAN_IE_SUPP_RATES pItemExtRates,
 202     bool bUpdateBasicRate,
 203     unsigned short *pwMaxBasicRate,
 204     unsigned short *pwMaxSuppRate,
 205     unsigned short *pwSuppRate,
 206     unsigned char *pbyTopCCKRate,
 207     unsigned char *pbyTopOFDMRate
 208     )
 209 {
 210 PSDevice  pDevice = (PSDevice) pDeviceHandler;
 211 unsigned int ii;
 212 unsigned char byHighSuppRate = 0;
 213 unsigned char byRate = 0;
 214 unsigned short wOldBasicRate = pDevice->wBasicRate;
 215 unsigned int uRateLen;
 216
 217
 218     if (pItemRates == NULL)
 219         return;
 220
 221     *pwSuppRate = 0;
 222     uRateLen = pItemRates->len;
 223
 224     DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate Len: %d\n", uRateLen);
 225     if (pDevice->eCurrentPHYType != PHY_TYPE_11B) {
 226         if (uRateLen > WLAN_RATES_MAXLEN)
 227             uRateLen = WLAN_RATES_MAXLEN;
 228     } else {
 229         if (uRateLen > WLAN_RATES_MAXLEN_11B)
 230             uRateLen = WLAN_RATES_MAXLEN_11B;
 231     }
 232
 233     for (ii = 0; ii < uRateLen; ii++) {
 234         byRate = (unsigned char)(pItemRates->abyRates[ii]);
 235         if (WLAN_MGMT_IS_BASICRATE(byRate) &&
 236             (bUpdateBasicRate == true))  {
 237             // Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate
 238             CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
 239             DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
 240         }
 241         byRate = (unsigned char)(pItemRates->abyRates[ii]&0x7F);
 242         if (byHighSuppRate == 0)
 243             byHighSuppRate = byRate;
 244         if (byRate > byHighSuppRate)
 245             byHighSuppRate = byRate;
 246         *pwSuppRate |= (1<<wGetRateIdx(byRate));
 247     }
 248     if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
 249         (pDevice->eCurrentPHYType != PHY_TYPE_11B)) {
 250
 251         unsigned int uExtRateLen = pItemExtRates->len;
 252
 253         if (uExtRateLen > WLAN_RATES_MAXLEN)
 254             uExtRateLen = WLAN_RATES_MAXLEN;
 255
 256         for (ii = 0; ii < uExtRateLen ; ii++) {
 257             byRate = (unsigned char)(pItemExtRates->abyRates[ii]);
 258             // select highest basic rate
 259             if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
 260                 // Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate
 261                 CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
 262                 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
 263             }
 264             byRate = (unsigned char)(pItemExtRates->abyRates[ii]&0x7F);
 265             if (byHighSuppRate == 0)
 266                 byHighSuppRate = byRate;
 267             if (byRate > byHighSuppRate)
 268                 byHighSuppRate = byRate;
 269             *pwSuppRate |= (1<<wGetRateIdx(byRate));
 270             //DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n", wGetRateIdx(byRate), byRate));
 271         }
 272     } //if(pItemExtRates != NULL)
 273
 274     if ((pDevice->byPacketType == PK_TYPE_11GB) && CARDbIsOFDMinBasicRate((void *)pDevice)) {
 275         pDevice->byPacketType = PK_TYPE_11GA;
 276     }
 277
 278     *pbyTopCCKRate = pDevice->byTopCCKBasicRate;
 279     *pbyTopOFDMRate = pDevice->byTopOFDMBasicRate;
 280     *pwMaxSuppRate = wGetRateIdx(byHighSuppRate);
 281     if ((pDevice->byPacketType==PK_TYPE_11B) || (pDevice->byPacketType==PK_TYPE_11GB))
 282        *pwMaxBasicRate = pDevice->byTopCCKBasicRate;
 283     else
 284        *pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
 285     if (wOldBasicRate != pDevice->wBasicRate)
 286         CARDvSetRSPINF((void *)pDevice, pDevice->eCurrentPHYType);
 287
 288      DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Exit ParseMaxRate\n");
 289 }
 290
 291
 292 /*+
 293  *
 294  * Routine Description:
 295  *      Rate fallback Algorithm Implementaion
 296  *
 297  * Parameters:
 298  *  In:
 299  *      pDevice         - Pointer to the adapter
 300  *      psNodeDBTable   - Pointer to Node Data Base
 301  *  Out:
 302  *      none
 303  *
 304  * Return Value: none
 305  *
 306 -*/
 307 #define AUTORATE_TXCNT_THRESHOLD        20
 308 #define AUTORATE_INC_THRESHOLD          30
 309
 310 void
 311 RATEvTxRateFallBack (
 312     void *pDeviceHandler,
 313     PKnownNodeDB psNodeDBTable
 314     )
 315 {
 316 PSDevice        pDevice = (PSDevice) pDeviceHandler;
 317 unsigned short wIdxDownRate = 0;
 318 unsigned int ii;
 319 //unsigned long dwRateTable[MAX_RATE]  = {1,   2,   5,   11,  6,    9,    12,   18,  24,  36,  48,  54};
 320 bool bAutoRate[MAX_RATE]    = {true,true,true,true,false,false,true,true,true,true,true,true};
 321         unsigned long dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180, 240, 360, 480, 540};
 322         unsigned long dwThroughput = 0;
 323         unsigned short wIdxUpRate = 0;
 324         unsigned long dwTxDiff = 0;
 325
 326     if (pDevice->pMgmt->eScanState != WMAC_NO_SCANNING) {
 327         // Don't do Fallback when scanning Channel
 328         return;
 329     }
 330
 331     psNodeDBTable->uTimeCount ++;
 332
 333     if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
 334         dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
 335
 336     if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
 337         (dwTxDiff < AUTORATE_TXFAIL_CNT) &&
 338         (psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
 339         return;
 340     }
 341
 342     if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT) {
 343         psNodeDBTable->uTimeCount = 0;
 344     }
 345
 346
 347     for(ii=0;ii<MAX_RATE;ii++) {
 348         if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
 349             if (bAutoRate[ii] == true) {
 350                 wIdxUpRate = (unsigned short) ii;
 351             }
 352         } else {
 353             bAutoRate[ii] = false;
 354         }
 355     }
 356
 357     for(ii=0;ii<=psNodeDBTable->wTxDataRate;ii++) {
 358         if ( (psNodeDBTable->uTxOk[ii] != 0) ||
 359              (psNodeDBTable->uTxFail[ii] != 0) ) {
 360             dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
 361             if (ii < RATE_11M) {
 362                 psNodeDBTable->uTxFail[ii] *= 4;
 363             }
 364             dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
 365         }
 366 //        DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate %d,Ok: %d, Fail:%d, Throughput:%d\n",
 367 //                       ii, psNodeDBTable->uTxOk[ii], psNodeDBTable->uTxFail[ii], dwThroughputTbl[ii]);
 368     }
 369     dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
 370
 371     wIdxDownRate = psNodeDBTable->wTxDataRate;
 372     for(ii = psNodeDBTable->wTxDataRate; ii > 0;) {
 373         ii--;
 374         if ( (dwThroughputTbl[ii] > dwThroughput) &&
 375              (bAutoRate[ii]==true) ) {
 376             dwThroughput = dwThroughputTbl[ii];
 377             wIdxDownRate = (unsigned short) ii;
 378         }
 379     }
 380     psNodeDBTable->wTxDataRate = wIdxDownRate;
 381     if (psNodeDBTable->uTxOk[MAX_RATE]) {
 382         if (psNodeDBTable->uTxOk[MAX_RATE] >
 383            (psNodeDBTable->uTxFail[MAX_RATE] * 4) ) {
 384             psNodeDBTable->wTxDataRate = wIdxUpRate;
 385         }
 386     }else { // adhoc, if uTxOk =0 & uTxFail = 0
 387         if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
 388             psNodeDBTable->wTxDataRate = wIdxUpRate;
 389     }
 390 //2008-5-8 <add> by chester
 391 TxRate_iwconfig=psNodeDBTable->wTxDataRate;
 392     s_vResetCounter(psNodeDBTable);
 393 //    DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate: %d, U:%d, D:%d\n", psNodeDBTable->wTxDataRate, wIdxUpRate, wIdxDownRate);
 394
 395     return;
 396
 397 }
 398
 399 /*+
 400  *
 401  * Description:
 402  *    This routine is used to assemble available Rate IE.
 403  *
 404  * Parameters:
 405  *  In:
 406  *    pDevice
 407  *  Out:
 408  *
 409  * Return Value: None
 410  *
 411 -*/
 412 unsigned char
 413 RATEuSetIE (
 414     PWLAN_IE_SUPP_RATES pSrcRates,
 415     PWLAN_IE_SUPP_RATES pDstRates,
 416     unsigned int uRateLen
 417     )
 418 {
 419     unsigned int ii, uu, uRateCnt = 0;
 420
 421     if ((pSrcRates == NULL) || (pDstRates == NULL))
 422         return 0;
 423
 424     if (pSrcRates->len == 0)
 425         return 0;
 426
 427     for (ii = 0; ii < uRateLen; ii++) {
 428         for (uu = 0; uu < pSrcRates->len; uu++) {
 429             if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
 430                 pDstRates->abyRates[uRateCnt ++] = pSrcRates->abyRates[uu];
 431                 break;
 432             }
 433         }
 434     }
 435     return (unsigned char)uRateCnt;
 436 }
 437