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