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 /*---------------------  Static Classes  ----------------------------*/
  49
  50 extern unsigned short TxRate_iwconfig; //2008-5-8 <add> by chester
  51 /*---------------------  Static Variables  --------------------------*/
  52 //static int          msglevel                =MSG_LEVEL_DEBUG;
  53 static int msglevel = MSG_LEVEL_INFO;
  54 const unsigned char acbyIERate[MAX_RATE] =
  55 {0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18, 0x24, 0x30, 0x48, 0x60, 0x6C};
  56
  57 #define AUTORATE_TXOK_CNT       0x0400
  58 #define AUTORATE_TXFAIL_CNT     0x0064
  59 #define AUTORATE_TIMEOUT        10
  60
  61 /*---------------------  Static Functions  --------------------------*/
  62
  63 void s_vResetCounter(
  64         PKnownNodeDB psNodeDBTable
  65 );
  66
  67 void
  68 s_vResetCounter(
  69         PKnownNodeDB psNodeDBTable
  70 )
  71 {
  72         unsigned char ii;
  73
  74         // clear statistic counter for auto_rate
  75         for (ii = 0; ii <= MAX_RATE; ii++) {
  76                 psNodeDBTable->uTxOk[ii] = 0;
  77                 psNodeDBTable->uTxFail[ii] = 0;
  78         }
  79 }
  80
  81 /*---------------------  Export Variables  --------------------------*/
  82
  83 /*---------------------  Export Functions  --------------------------*/
  84
  85 /*+
  86  *
  87  * Description:
  88  *      Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
  89  *
  90  * Parameters:
  91  *  In:
  92  *      unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
  93  *  Out:
  94  *      none
  95  *
  96  * Return Value: RateIdx
  97  *
  98  -*/
  99 unsigned char
 100 DATARATEbyGetRateIdx(
 101         unsigned char byRate
 102 )
 103 {
 104         unsigned char ii;
 105
 106         //Erase basicRate flag.
 107         byRate = byRate & 0x7F;//0111 1111
 108
 109         for (ii = 0; ii < MAX_RATE; ii++) {
 110                 if (acbyIERate[ii] == byRate)
 111                         return ii;
 112         }
 113         return 0;
 114 }
 115
 116 /*+
 117  *
 118  * Routine Description:
 119  *      Rate fallback Algorithm Implementation
 120  *
 121  * Parameters:
 122  *  In:
 123  *      pDevice         - Pointer to the adapter
 124  *      psNodeDBTable   - Pointer to Node Data Base
 125  *  Out:
 126  *      none
 127  *
 128  * Return Value: none
 129  *
 130  -*/
 131 #define AUTORATE_TXCNT_THRESHOLD        20
 132 #define AUTORATE_INC_THRESHOLD          30
 133
 134 /*+
 135  *
 136  * Description:
 137  *      Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
 138  *
 139  * Parameters:
 140  *  In:
 141  *      unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
 142  *  Out:
 143  *      none
 144  *
 145  * Return Value: RateIdx
 146  *
 147  -*/
 148 unsigned short
 149 wGetRateIdx(
 150         unsigned char byRate
 151 )
 152 {
 153         unsigned short ii;
 154
 155         //Erase basicRate flag.
 156         byRate = byRate & 0x7F;//0111 1111
 157
 158         for (ii = 0; ii < MAX_RATE; ii++) {
 159                 if (acbyIERate[ii] == byRate)
 160                         return ii;
 161         }
 162         return 0;
 163 }
 164
 165 /*+
 166  *
 167  * Description:
 168  *      Parsing the highest basic & support rate in rate field of frame.
 169  *
 170  * Parameters:
 171  *  In:
 172  *      pDevice         - Pointer to the adapter
 173  *      pItemRates      - Pointer to Rate field defined in 802.11 spec.
 174  *      pItemExtRates      - Pointer to Extended Rate field defined in 802.11 spec.
 175  *  Out:
 176  *      pwMaxBasicRate  - Maximum Basic Rate
 177  *      pwMaxSuppRate   - Maximum Supported Rate
 178  *      pbyTopCCKRate   - Maximum Basic Rate in CCK mode
 179  *      pbyTopOFDMRate  - Maximum Basic Rate in OFDM mode
 180  *
 181  * Return Value: none
 182  *
 183  -*/
 184 void
 185 RATEvParseMaxRate(
 186         void *pDeviceHandler,
 187         PWLAN_IE_SUPP_RATES pItemRates,
 188         PWLAN_IE_SUPP_RATES pItemExtRates,
 189         bool bUpdateBasicRate,
 190         unsigned short *pwMaxBasicRate,
 191         unsigned short *pwMaxSuppRate,
 192         unsigned short *pwSuppRate,
 193         unsigned char *pbyTopCCKRate,
 194         unsigned char *pbyTopOFDMRate
 195 )
 196 {
 197         PSDevice  pDevice = (PSDevice) pDeviceHandler;
 198         unsigned int ii;
 199         unsigned char byHighSuppRate = 0;
 200         unsigned char byRate = 0;
 201         unsigned short wOldBasicRate = pDevice->wBasicRate;
 202         unsigned int uRateLen;
 203
 204         if (pItemRates == NULL)
 205                 return;
 206
 207         *pwSuppRate = 0;
 208         uRateLen = pItemRates->len;
 209
 210         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "ParseMaxRate Len: %d\n", uRateLen);
 211         if (pDevice->eCurrentPHYType != PHY_TYPE_11B) {
 212                 if (uRateLen > WLAN_RATES_MAXLEN)
 213                         uRateLen = WLAN_RATES_MAXLEN;
 214         } else {
 215                 if (uRateLen > WLAN_RATES_MAXLEN_11B)
 216                         uRateLen = WLAN_RATES_MAXLEN_11B;
 217         }
 218
 219         for (ii = 0; ii < uRateLen; ii++) {
 220                 byRate = (unsigned char)(pItemRates->abyRates[ii]);
 221                 if (WLAN_MGMT_IS_BASICRATE(byRate) && bUpdateBasicRate)  {
 222                         // Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate
 223                         CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
 224                         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
 225                 }
 226                 byRate = (unsigned char)(pItemRates->abyRates[ii]&0x7F);
 227                 if (byHighSuppRate == 0)
 228                         byHighSuppRate = byRate;
 229                 if (byRate > byHighSuppRate)
 230                         byHighSuppRate = byRate;
 231                 *pwSuppRate |= (1<<wGetRateIdx(byRate));
 232         }
 233         if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
 234             (pDevice->eCurrentPHYType != PHY_TYPE_11B)) {
 235                 unsigned int uExtRateLen = pItemExtRates->len;
 236
 237                 if (uExtRateLen > WLAN_RATES_MAXLEN)
 238                         uExtRateLen = WLAN_RATES_MAXLEN;
 239
 240                 for (ii = 0; ii < uExtRateLen; ii++) {
 241                         byRate = (unsigned char)(pItemExtRates->abyRates[ii]);
 242                         // select highest basic rate
 243                         if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
 244                                 // Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate
 245                                 CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
 246                                 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
 247                         }
 248                         byRate = (unsigned char)(pItemExtRates->abyRates[ii]&0x7F);
 249                         if (byHighSuppRate == 0)
 250                                 byHighSuppRate = byRate;
 251                         if (byRate > byHighSuppRate)
 252                                 byHighSuppRate = byRate;
 253                         *pwSuppRate |= (1<<wGetRateIdx(byRate));
 254                         //DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n", wGetRateIdx(byRate), byRate));
 255                 }
 256         } //if (pItemExtRates != NULL)
 257
 258         if ((pDevice->byPacketType == PK_TYPE_11GB) && CARDbIsOFDMinBasicRate((void *)pDevice)) {
 259                 pDevice->byPacketType = PK_TYPE_11GA;
 260         }
 261
 262         *pbyTopCCKRate = pDevice->byTopCCKBasicRate;
 263         *pbyTopOFDMRate = pDevice->byTopOFDMBasicRate;
 264         *pwMaxSuppRate = wGetRateIdx(byHighSuppRate);
 265         if ((pDevice->byPacketType == PK_TYPE_11B) || (pDevice->byPacketType == PK_TYPE_11GB))
 266                 *pwMaxBasicRate = pDevice->byTopCCKBasicRate;
 267         else
 268                 *pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
 269         if (wOldBasicRate != pDevice->wBasicRate)
 270                 CARDvSetRSPINF((void *)pDevice, pDevice->eCurrentPHYType);
 271
 272         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Exit ParseMaxRate\n");
 273 }
 274
 275 /*+
 276  *
 277  * Routine Description:
 278  *      Rate fallback Algorithm Implementaion
 279  *
 280  * Parameters:
 281  *  In:
 282  *      pDevice         - Pointer to the adapter
 283  *      psNodeDBTable   - Pointer to Node Data Base
 284  *  Out:
 285  *      none
 286  *
 287  * Return Value: none
 288  *
 289  -*/
 290 #define AUTORATE_TXCNT_THRESHOLD        20
 291 #define AUTORATE_INC_THRESHOLD          30
 292
 293 void
 294 RATEvTxRateFallBack(
 295         void *pDeviceHandler,
 296         PKnownNodeDB psNodeDBTable
 297 )
 298 {
 299         PSDevice        pDevice = (PSDevice) pDeviceHandler;
 300         unsigned short wIdxDownRate = 0;
 301         unsigned int ii;
 302 //unsigned long dwRateTable[MAX_RATE]  = {1,   2,   5,   11,  6,    9,    12,   18,  24,  36,  48,  54};
 303         bool bAutoRate[MAX_RATE]    = {true, true, true, true, false, false, true, true, true, true, true, true};
 304         unsigned long dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180, 240, 360, 480, 540};
 305         unsigned long dwThroughput = 0;
 306         unsigned short wIdxUpRate = 0;
 307         unsigned long dwTxDiff = 0;
 308
 309         if (pDevice->pMgmt->eScanState != WMAC_NO_SCANNING) {
 310                 // Don't do Fallback when scanning Channel
 311                 return;
 312         }
 313
 314         psNodeDBTable->uTimeCount++;
 315
 316         if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
 317                 dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
 318
 319         if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
 320             (dwTxDiff < AUTORATE_TXFAIL_CNT) &&
 321             (psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
 322                 return;
 323         }
 324
 325         if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT) {
 326                 psNodeDBTable->uTimeCount = 0;
 327         }
 328
 329         for (ii = 0; ii < MAX_RATE; ii++) {
 330                 if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
 331                         if (bAutoRate[ii]) {
 332                                 wIdxUpRate = (unsigned short) ii;
 333                         }
 334                 } else {
 335                         bAutoRate[ii] = false;
 336                 }
 337         }
 338
 339         for (ii = 0; ii <= psNodeDBTable->wTxDataRate; ii++) {
 340                 if ((psNodeDBTable->uTxOk[ii] != 0) ||
 341                     (psNodeDBTable->uTxFail[ii] != 0)) {
 342                         dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
 343                         if (ii < RATE_11M) {
 344                                 psNodeDBTable->uTxFail[ii] *= 4;
 345                         }
 346                         dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
 347                 }
 348 //        DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Rate %d,Ok: %d, Fail:%d, Throughput:%d\n",
 349 //                       ii, psNodeDBTable->uTxOk[ii], psNodeDBTable->uTxFail[ii], dwThroughputTbl[ii]);
 350         }
 351         dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
 352
 353         wIdxDownRate = psNodeDBTable->wTxDataRate;
 354         for (ii = psNodeDBTable->wTxDataRate; ii > 0;) {
 355                 ii--;
 356                 if ((dwThroughputTbl[ii] > dwThroughput) && bAutoRate[ii]) {
 357                         dwThroughput = dwThroughputTbl[ii];
 358                         wIdxDownRate = (unsigned short) ii;
 359                 }
 360         }
 361         psNodeDBTable->wTxDataRate = wIdxDownRate;
 362         if (psNodeDBTable->uTxOk[MAX_RATE]) {
 363                 if (psNodeDBTable->uTxOk[MAX_RATE] >
 364                     (psNodeDBTable->uTxFail[MAX_RATE] * 4)) {
 365                         psNodeDBTable->wTxDataRate = wIdxUpRate;
 366                 }
 367         } else { // adhoc, if uTxOk =0 & uTxFail = 0
 368                 if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
 369                         psNodeDBTable->wTxDataRate = wIdxUpRate;
 370         }
 371 //2008-5-8 <add> by chester
 372         TxRate_iwconfig = psNodeDBTable->wTxDataRate;
 373         s_vResetCounter(psNodeDBTable);
 374 //    DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Rate: %d, U:%d, D:%d\n", psNodeDBTable->wTxDataRate, wIdxUpRate, wIdxDownRate);
 375
 376         return;
 377 }
 378
 379 /*+
 380  *
 381  * Description:
 382  *    This routine is used to assemble available Rate IE.
 383  *
 384  * Parameters:
 385  *  In:
 386  *    pDevice
 387  *  Out:
 388  *
 389  * Return Value: None
 390  *
 391  -*/
 392 unsigned char
 393 RATEuSetIE(
 394         PWLAN_IE_SUPP_RATES pSrcRates,
 395         PWLAN_IE_SUPP_RATES pDstRates,
 396         unsigned int uRateLen
 397 )
 398 {
 399         unsigned int ii, uu, uRateCnt = 0;
 400
 401         if ((pSrcRates == NULL) || (pDstRates == NULL))
 402                 return 0;
 403
 404         if (pSrcRates->len == 0)
 405                 return 0;
 406
 407         for (ii = 0; ii < uRateLen; ii++) {
 408                 for (uu = 0; uu < pSrcRates->len; uu++) {
 409                         if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
 410                                 pDstRates->abyRates[uRateCnt++] = pSrcRates->abyRates[uu];
 411                                 break;
 412                         }
 413                 }
 414         }
 415         return (unsigned char)uRateCnt;
 416 }