drivers/staging/vt6656/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 "tmacro.h"
  37 #include "mac.h"
  38 #include "80211mgr.h"
  39 #include "bssdb.h"
  40 #include "datarate.h"
  41 #include "card.h"
  42 #include "baseband.h"
  43 #include "srom.h"
  44 #include "rf.h"
  45
  46 /* static int msglevel = MSG_LEVEL_DEBUG; */
  47 static int msglevel = MSG_LEVEL_INFO;
  48 static const u8 acbyIERate[MAX_RATE] = {0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18,
  49         0x24, 0x30, 0x48, 0x60, 0x6C};
  50
  51 #define AUTORATE_TXOK_CNT       0x0400
  52 #define AUTORATE_TXFAIL_CNT     0x0064
  53 #define AUTORATE_TIMEOUT        10
  54
  55 void s_vResetCounter(PKnownNodeDB psNodeDBTable);
  56
  57 void s_vResetCounter(PKnownNodeDB psNodeDBTable)
  58 {
  59         u8 ii;
  60
  61         /* clear statistics counter for auto_rate */
  62         for (ii = 0; ii <= MAX_RATE; ii++) {
  63                 psNodeDBTable->uTxOk[ii] = 0;
  64                 psNodeDBTable->uTxFail[ii] = 0;
  65         }
  66 }
  67
  68 /*+
  69  *
  70  * Routine Description:
  71  *      Rate fallback Algorithm Implementaion
  72  *
  73  * Parameters:
  74  *  In:
  75  *      pDevice         - Pointer to the adapter
  76  *      psNodeDBTable   - Pointer to Node Data Base
  77  *  Out:
  78  *      none
  79  *
  80  * Return Value: none
  81  *
  82 -*/
  83 #define AUTORATE_TXCNT_THRESHOLD        20
  84 #define AUTORATE_INC_THRESHOLD          30
  85
  86 /*+
  87  *
  88  * Description:
  89  *      Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
  90  *
  91  * Parameters:
  92  *  In:
  93  *      u8    - Rate value in SuppRates IE or ExtSuppRates IE
  94  *  Out:
  95  *      none
  96  *
  97  * Return Value: RateIdx
  98  *
  99 -*/
 100 u16 RATEwGetRateIdx(u8 byRate)
 101 {
 102         u16 ii;
 103
 104         /* erase BasicRate flag */
 105         byRate = byRate & 0x7F;
 106
 107         for (ii = 0; ii < MAX_RATE; ii++) {
 108                 if (acbyIERate[ii] == byRate)
 109                         return ii;
 110         }
 111         return 0;
 112 }
 113
 114 /*+
 115  *
 116  * Description:
 117  *      Parsing the highest basic & support rate in rate field of frame.
 118  *
 119  * Parameters:
 120  *  In:
 121  *      pDevice         - Pointer to the adapter
 122  *      pItemRates      - Pointer to Rate field defined in 802.11 spec.
 123  *      pItemExtRates      - Pointer to Extended Rate field defined in 802.11 spec.
 124  *  Out:
 125  *      pwMaxBasicRate  - Maximum Basic Rate
 126  *      pwMaxSuppRate   - Maximum Supported Rate
 127  *      pbyTopCCKRate   - Maximum Basic Rate in CCK mode
 128  *      pbyTopOFDMRate  - Maximum Basic Rate in OFDM mode
 129  *
 130  * Return Value: none
 131  *
 132 -*/
 133
 134 void RATEvParseMaxRate(struct vnt_private *pDevice,
 135         PWLAN_IE_SUPP_RATES pItemRates, PWLAN_IE_SUPP_RATES pItemExtRates,
 136         int bUpdateBasicRate, u16 *pwMaxBasicRate, u16 *pwMaxSuppRate,
 137         u16 *pwSuppRate, u8 *pbyTopCCKRate, u8 *pbyTopOFDMRate)
 138 {
 139         int ii;
 140         u8 byHighSuppRate = 0, byRate = 0;
 141         u16 wOldBasicRate = pDevice->wBasicRate;
 142         u32 uRateLen;
 143
 144         if (pItemRates == NULL)
 145                 return;
 146
 147         *pwSuppRate = 0;
 148         uRateLen = pItemRates->len;
 149
 150         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate Len: %d\n", uRateLen);
 151         if (pDevice->byBBType != BB_TYPE_11B) {
 152                 if (uRateLen > WLAN_RATES_MAXLEN)
 153                         uRateLen = WLAN_RATES_MAXLEN;
 154         } else {
 155                 if (uRateLen > WLAN_RATES_MAXLEN_11B)
 156                         uRateLen = WLAN_RATES_MAXLEN_11B;
 157         }
 158
 159         for (ii = 0; ii < uRateLen; ii++) {
 160                 byRate = (u8)(pItemRates->abyRates[ii]);
 161                 if (WLAN_MGMT_IS_BASICRATE(byRate) &&
 162                                 (bUpdateBasicRate == true)) {
 163                         /*
 164                          * add to basic rate set, update pDevice->byTopCCKBasicRate and
 165                          * pDevice->byTopOFDMBasicRate
 166                          */
 167                         CARDbAddBasicRate((void *)pDevice, RATEwGetRateIdx(byRate));
 168                         DBG_PRT(MSG_LEVEL_DEBUG,
 169                                 KERN_INFO"ParseMaxRate AddBasicRate: %d\n",
 170                                 RATEwGetRateIdx(byRate));
 171                 }
 172                 byRate = (u8)(pItemRates->abyRates[ii]&0x7F);
 173                 if (byHighSuppRate == 0)
 174                         byHighSuppRate = byRate;
 175                 if (byRate > byHighSuppRate)
 176                         byHighSuppRate = byRate;
 177                 *pwSuppRate |= (1<<RATEwGetRateIdx(byRate));
 178         }
 179         if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
 180                         (pDevice->byBBType != BB_TYPE_11B)) {
 181
 182                 unsigned int uExtRateLen = pItemExtRates->len;
 183
 184                 if (uExtRateLen > WLAN_RATES_MAXLEN)
 185                         uExtRateLen = WLAN_RATES_MAXLEN;
 186
 187                 for (ii = 0; ii < uExtRateLen; ii++) {
 188                         byRate = (u8)(pItemExtRates->abyRates[ii]);
 189                         /* select highest basic rate */
 190                         if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
 191                                 /*
 192                                  * add to basic rate set, update pDevice->byTopCCKBasicRate and
 193                                  * pDevice->byTopOFDMBasicRate
 194                                  */
 195                                 CARDbAddBasicRate((void *)pDevice, RATEwGetRateIdx(byRate));
 196                                 DBG_PRT(MSG_LEVEL_DEBUG,
 197                                                 KERN_INFO"ParseMaxRate AddBasicRate: %d\n",
 198                                                 RATEwGetRateIdx(byRate));
 199                         }
 200                         byRate = (u8)(pItemExtRates->abyRates[ii]&0x7F);
 201                         if (byHighSuppRate == 0)
 202                                 byHighSuppRate = byRate;
 203                         if (byRate > byHighSuppRate)
 204                                 byHighSuppRate = byRate;
 205                         *pwSuppRate |= (1<<RATEwGetRateIdx(byRate));
 206
 207                         /* DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n",
 208                          * RATEwGetRateIdx(byRate), byRate));
 209                          */
 210                 }
 211         }
 212
 213         if ((pDevice->byPacketType == PK_TYPE_11GB)
 214                         && CARDbIsOFDMinBasicRate((void *)pDevice)) {
 215                 pDevice->byPacketType = PK_TYPE_11GA;
 216         }
 217
 218         *pbyTopCCKRate = pDevice->byTopCCKBasicRate;
 219         *pbyTopOFDMRate = pDevice->byTopOFDMBasicRate;
 220         *pwMaxSuppRate = RATEwGetRateIdx(byHighSuppRate);
 221         if ((pDevice->byPacketType == PK_TYPE_11B) || (pDevice->byPacketType == PK_TYPE_11GB))
 222                 *pwMaxBasicRate = pDevice->byTopCCKBasicRate;
 223         else
 224                 *pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
 225         if (wOldBasicRate != pDevice->wBasicRate)
 226                 CARDvSetRSPINF((void *)pDevice, pDevice->byBBType);
 227
 228         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Exit ParseMaxRate\n");
 229 }
 230
 231 /*+
 232  *
 233  * Routine Description:
 234  *      Rate fallback Algorithm Implementaion
 235  *
 236  * Parameters:
 237  *  In:
 238  *      pDevice         - Pointer to the adapter
 239  *      psNodeDBTable   - Pointer to Node Data Base
 240  *  Out:
 241  *      none
 242  *
 243  * Return Value: none
 244  *
 245 -*/
 246 #define AUTORATE_TXCNT_THRESHOLD        20
 247 #define AUTORATE_INC_THRESHOLD          30
 248
 249 void RATEvTxRateFallBack(struct vnt_private *pDevice,
 250         PKnownNodeDB psNodeDBTable)
 251 {
 252         struct vnt_manager *pMgmt = &pDevice->vnt_mgmt;
 253         u16 wIdxDownRate = 0;
 254         int ii;
 255         int bAutoRate[MAX_RATE] = {true, true, true, true, false, false, true,
 256                                          true, true, true, true, true};
 257         u32 dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180,
 258                 240, 360, 480, 540};
 259         u32 dwThroughput = 0;
 260         u16 wIdxUpRate = 0;
 261         u32 dwTxDiff = 0;
 262
 263         if (pMgmt->eScanState != WMAC_NO_SCANNING)
 264                 return; /* Don't do Fallback when scanning Channel */
 265
 266         psNodeDBTable->uTimeCount++;
 267
 268         if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
 269                 dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
 270
 271         if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
 272                         (dwTxDiff < AUTORATE_TXFAIL_CNT) &&
 273                         (psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
 274                 return;
 275         }
 276
 277         if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT)
 278                 psNodeDBTable->uTimeCount = 0;
 279
 280         for (ii = 0; ii < MAX_RATE; ii++) {
 281                 if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
 282                         if (bAutoRate[ii] == true)
 283                                 wIdxUpRate = (u16) ii;
 284                 } else {
 285                         bAutoRate[ii] = false;
 286                 }
 287         }
 288
 289         for (ii = 0; ii <= psNodeDBTable->wTxDataRate; ii++) {
 290                 if ((psNodeDBTable->uTxOk[ii] != 0) ||
 291                                 (psNodeDBTable->uTxFail[ii] != 0)) {
 292                         dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
 293                         if (ii < RATE_11M)
 294                                 psNodeDBTable->uTxFail[ii] *= 4;
 295                         dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
 296                 }
 297                 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate %d,Ok: %d, Fail:%d, Throughput:%d\n",
 298                                 ii, (int)psNodeDBTable->uTxOk[ii], (int)psNodeDBTable->uTxFail[ii], (int)dwThroughputTbl[ii]);
 299         }
 300         dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
 301
 302         wIdxDownRate = psNodeDBTable->wTxDataRate;
 303         for (ii = psNodeDBTable->wTxDataRate; ii > 0;) {
 304                 ii--;
 305                 if ((dwThroughputTbl[ii] > dwThroughput) &&
 306                                 (bAutoRate[ii] == true)) {
 307                         dwThroughput = dwThroughputTbl[ii];
 308                         wIdxDownRate = (u16) ii;
 309                 }
 310         }
 311         psNodeDBTable->wTxDataRate = wIdxDownRate;
 312         if (psNodeDBTable->uTxOk[MAX_RATE]) {
 313                 if (psNodeDBTable->uTxOk[MAX_RATE] >
 314                                 (psNodeDBTable->uTxFail[MAX_RATE] * 4)) {
 315                         psNodeDBTable->wTxDataRate = wIdxUpRate;
 316                 }
 317         } else { /* adhoc, if uTxOk(total) == 0 & uTxFail(total) == 0 */
 318                 if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
 319                         psNodeDBTable->wTxDataRate = wIdxUpRate;
 320         }
 321
 322         if (pDevice->byBBType == BB_TYPE_11A) {
 323                 if (psNodeDBTable->wTxDataRate <= RATE_11M)
 324                         psNodeDBTable->wTxDataRate = RATE_6M;
 325         }
 326         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"uTxOk[MAX_RATE] %d, uTxFail[MAX_RATE]:%d\n", (int)psNodeDBTable->uTxOk[MAX_RATE], (int)psNodeDBTable->uTxFail[MAX_RATE]);
 327         s_vResetCounter(psNodeDBTable);
 328         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate: %d, U:%d, D:%d\n", (int)psNodeDBTable->wTxDataRate, (int)wIdxUpRate, (int)wIdxDownRate);
 329         return;
 330 }
 331
 332 /*+
 333  *
 334  * Description:
 335  *    This routine is used to assemble available Rate IE.
 336  *
 337  * Parameters:
 338  *  In:
 339  *    pDevice
 340  *  Out:
 341  *
 342  * Return Value: None
 343  *
 344 -*/
 345 u8 RATEuSetIE(PWLAN_IE_SUPP_RATES pSrcRates, PWLAN_IE_SUPP_RATES pDstRates,
 346                 unsigned int uRateLen)
 347 {
 348         unsigned int ii, uu, uRateCnt = 0;
 349
 350         if ((pSrcRates == NULL) || (pDstRates == NULL))
 351                 return 0;
 352
 353         if (pSrcRates->len == 0)
 354                 return 0;
 355
 356         for (ii = 0; ii < uRateLen; ii++) {
 357                 for (uu = 0; uu < pSrcRates->len; uu++) {
 358                         if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
 359                                 pDstRates->abyRates[uRateCnt++] = pSrcRates->abyRates[uu];
 360                                 break;
 361                         }
 362                 }
 363         }
 364         return (u8)uRateCnt;
 365 }