2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
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.
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.
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.
21 * Purpose: Handles the auto fallback & data rates 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.
47 /*--------------------- Static Definitions -------------------------*/
52 /*--------------------- Static Classes ----------------------------*/
56 /*--------------------- Static Variables --------------------------*/
58 /* static int msglevel = MSG_LEVEL_DEBUG; */
59 static int msglevel =MSG_LEVEL_INFO;
60 const BYTE acbyIERate[MAX_RATE] =
61 {0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18, 0x24, 0x30, 0x48, 0x60, 0x6C};
63 #define AUTORATE_TXOK_CNT 0x0400
64 #define AUTORATE_TXFAIL_CNT 0x0064
65 #define AUTORATE_TIMEOUT 10
67 /*--------------------- Static Functions --------------------------*/
69 void s_vResetCounter(PKnownNodeDB psNodeDBTable);
71 void s_vResetCounter(PKnownNodeDB psNodeDBTable)
75 /* clear statistics counter for auto_rate */
76 for (ii = 0; ii <= MAX_RATE; ii++) {
77 psNodeDBTable->uTxOk[ii] = 0;
78 psNodeDBTable->uTxFail[ii] = 0;
82 /*--------------------- Export Variables --------------------------*/
85 /*--------------------- Export Functions --------------------------*/
91 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
95 * BYTE - Rate value in SuppRates IE or ExtSuppRates IE
99 * Return Value: RateIdx
103 DATARATEbyGetRateIdx (
109 /* erase BasicRate flag */
110 byRate = byRate & 0x7F;
112 for (ii = 0; ii < MAX_RATE; ii ++) {
113 if (acbyIERate[ii] == byRate)
123 * Routine Description:
124 * Rate fallback Algorithm Implementaion
128 * pDevice - Pointer to the adapter
129 * psNodeDBTable - Pointer to Node Data Base
136 #define AUTORATE_TXCNT_THRESHOLD 20
137 #define AUTORATE_INC_THRESHOLD 30
145 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
149 * BYTE - Rate value in SuppRates IE or ExtSuppRates IE
153 * Return Value: RateIdx
163 /* erase BasicRate flag */
164 byRate = byRate & 0x7F;
166 for (ii = 0; ii < MAX_RATE; ii ++) {
167 if (acbyIERate[ii] == byRate)
176 * Parsing the highest basic & support rate in rate field of frame.
180 * pDevice - Pointer to the adapter
181 * pItemRates - Pointer to Rate field defined in 802.11 spec.
182 * pItemExtRates - Pointer to Extended Rate field defined in 802.11 spec.
184 * pwMaxBasicRate - Maximum Basic Rate
185 * pwMaxSuppRate - Maximum Supported Rate
186 * pbyTopCCKRate - Maximum Basic Rate in CCK mode
187 * pbyTopOFDMRate - Maximum Basic Rate in OFDM mode
193 void RATEvParseMaxRate(struct vnt_private *pDevice,
194 PWLAN_IE_SUPP_RATES pItemRates, PWLAN_IE_SUPP_RATES pItemExtRates,
195 int bUpdateBasicRate, u16 *pwMaxBasicRate, u16 *pwMaxSuppRate,
196 u16 *pwSuppRate, u8 *pbyTopCCKRate, u8 *pbyTopOFDMRate)
199 u8 byHighSuppRate = 0, byRate = 0;
200 u16 wOldBasicRate = pDevice->wBasicRate;
203 if (pItemRates == NULL)
207 uRateLen = pItemRates->len;
209 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate Len: %d\n", uRateLen);
210 if (pDevice->byBBType != BB_TYPE_11B) {
211 if (uRateLen > WLAN_RATES_MAXLEN)
212 uRateLen = WLAN_RATES_MAXLEN;
214 if (uRateLen > WLAN_RATES_MAXLEN_11B)
215 uRateLen = WLAN_RATES_MAXLEN_11B;
218 for (ii = 0; ii < uRateLen; ii++) {
219 byRate = (BYTE)(pItemRates->abyRates[ii]);
220 if (WLAN_MGMT_IS_BASICRATE(byRate) &&
221 (bUpdateBasicRate == true)) {
223 * add to basic rate set, update pDevice->byTopCCKBasicRate and
224 * pDevice->byTopOFDMBasicRate
226 CARDbAddBasicRate((void *)pDevice, RATEwGetRateIdx(byRate));
227 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", RATEwGetRateIdx(byRate));
229 byRate = (BYTE)(pItemRates->abyRates[ii]&0x7F);
230 if (byHighSuppRate == 0)
231 byHighSuppRate = byRate;
232 if (byRate > byHighSuppRate)
233 byHighSuppRate = byRate;
234 *pwSuppRate |= (1<<RATEwGetRateIdx(byRate));
236 if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
237 (pDevice->byBBType != BB_TYPE_11B)) {
239 unsigned int uExtRateLen = pItemExtRates->len;
241 if (uExtRateLen > WLAN_RATES_MAXLEN)
242 uExtRateLen = WLAN_RATES_MAXLEN;
244 for (ii = 0; ii < uExtRateLen ; ii++) {
245 byRate = (BYTE)(pItemExtRates->abyRates[ii]);
246 /* select highest basic rate */
247 if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
249 * add to basic rate set, update pDevice->byTopCCKBasicRate and
250 * pDevice->byTopOFDMBasicRate
252 CARDbAddBasicRate((void *)pDevice, RATEwGetRateIdx(byRate));
253 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", RATEwGetRateIdx(byRate));
255 byRate = (BYTE)(pItemExtRates->abyRates[ii]&0x7F);
256 if (byHighSuppRate == 0)
257 byHighSuppRate = byRate;
258 if (byRate > byHighSuppRate)
259 byHighSuppRate = byRate;
260 *pwSuppRate |= (1<<RATEwGetRateIdx(byRate));
262 /* DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n",
263 RATEwGetRateIdx(byRate), byRate)); */
267 if ((pDevice->byPacketType == PK_TYPE_11GB)
268 && CARDbIsOFDMinBasicRate((void *)pDevice)) {
269 pDevice->byPacketType = PK_TYPE_11GA;
272 *pbyTopCCKRate = pDevice->byTopCCKBasicRate;
273 *pbyTopOFDMRate = pDevice->byTopOFDMBasicRate;
274 *pwMaxSuppRate = RATEwGetRateIdx(byHighSuppRate);
275 if ((pDevice->byPacketType==PK_TYPE_11B) || (pDevice->byPacketType==PK_TYPE_11GB))
276 *pwMaxBasicRate = pDevice->byTopCCKBasicRate;
278 *pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
279 if (wOldBasicRate != pDevice->wBasicRate)
280 CARDvSetRSPINF((void *)pDevice, pDevice->byBBType);
282 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Exit ParseMaxRate\n");
288 * Routine Description:
289 * Rate fallback Algorithm Implementaion
293 * pDevice - Pointer to the adapter
294 * psNodeDBTable - Pointer to Node Data Base
301 #define AUTORATE_TXCNT_THRESHOLD 20
302 #define AUTORATE_INC_THRESHOLD 30
304 void RATEvTxRateFallBack(struct vnt_private *pDevice,
305 PKnownNodeDB psNodeDBTable)
307 struct vnt_manager *pMgmt = &pDevice->vnt_mgmt;
308 u16 wIdxDownRate = 0;
310 int bAutoRate[MAX_RATE] = {true, true, true, true, false, false, true,
311 true, true, true, true, true};
312 u32 dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180,
314 u32 dwThroughput = 0;
318 if (pMgmt->eScanState != WMAC_NO_SCANNING)
319 return; /* Don't do Fallback when scanning Channel */
321 psNodeDBTable->uTimeCount++;
323 if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
324 dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
326 if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
327 (dwTxDiff < AUTORATE_TXFAIL_CNT) &&
328 (psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
332 if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT) {
333 psNodeDBTable->uTimeCount = 0;
336 for (ii = 0; ii < MAX_RATE; ii++) {
337 if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
338 if (bAutoRate[ii] == true) {
339 wIdxUpRate = (WORD) ii;
342 bAutoRate[ii] = false;
346 for (ii = 0; ii <= psNodeDBTable->wTxDataRate; ii++) {
347 if ( (psNodeDBTable->uTxOk[ii] != 0) ||
348 (psNodeDBTable->uTxFail[ii] != 0) ) {
349 dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
351 psNodeDBTable->uTxFail[ii] *= 4;
353 dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
355 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate %d,Ok: %d, Fail:%d, Throughput:%d\n",
356 ii, (int)psNodeDBTable->uTxOk[ii], (int)psNodeDBTable->uTxFail[ii], (int)dwThroughputTbl[ii]);
358 dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
360 wIdxDownRate = psNodeDBTable->wTxDataRate;
361 for (ii = psNodeDBTable->wTxDataRate; ii > 0;) {
363 if ( (dwThroughputTbl[ii] > dwThroughput) &&
364 (bAutoRate[ii]==true) ) {
365 dwThroughput = dwThroughputTbl[ii];
366 wIdxDownRate = (WORD) ii;
369 psNodeDBTable->wTxDataRate = wIdxDownRate;
370 if (psNodeDBTable->uTxOk[MAX_RATE]) {
371 if (psNodeDBTable->uTxOk[MAX_RATE] >
372 (psNodeDBTable->uTxFail[MAX_RATE] * 4) ) {
373 psNodeDBTable->wTxDataRate = wIdxUpRate;
375 } else { /* adhoc, if uTxOk(total) == 0 & uTxFail(total) == 0 */
376 if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
377 psNodeDBTable->wTxDataRate = wIdxUpRate;
380 if (pDevice->byBBType == BB_TYPE_11A) {
381 if (psNodeDBTable->wTxDataRate <= RATE_11M)
382 psNodeDBTable->wTxDataRate = RATE_6M;
384 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]);
385 s_vResetCounter(psNodeDBTable);
386 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate: %d, U:%d, D:%d\n", (int)psNodeDBTable->wTxDataRate, (int)wIdxUpRate, (int)wIdxDownRate);
393 * This routine is used to assemble available Rate IE.
405 PWLAN_IE_SUPP_RATES pSrcRates,
406 PWLAN_IE_SUPP_RATES pDstRates,
407 unsigned int uRateLen
410 unsigned int ii, uu, uRateCnt = 0;
412 if ((pSrcRates == NULL) || (pDstRates == NULL))
415 if (pSrcRates->len == 0)
418 for (ii = 0; ii < uRateLen; ii++) {
419 for (uu = 0; uu < pSrcRates->len; uu++) {
420 if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
421 pDstRates->abyRates[uRateCnt ++] = pSrcRates->abyRates[uu];
426 return (BYTE)uRateCnt;