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.
46 /*--------------------- Static Definitions -------------------------*/
48 /*--------------------- Static Classes ----------------------------*/
50 extern unsigned short TxRate_iwconfig; /* 2008-5-8 <add> by chester */
51 /*--------------------- Static Variables --------------------------*/
52 static const unsigned char acbyIERate[MAX_RATE] = {
53 0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18, 0x24, 0x30, 0x48, 0x60, 0x6C
56 #define AUTORATE_TXOK_CNT 0x0400
57 #define AUTORATE_TXFAIL_CNT 0x0064
58 #define AUTORATE_TIMEOUT 10
60 /*--------------------- Static Functions --------------------------*/
63 PKnownNodeDB psNodeDBTable
68 PKnownNodeDB psNodeDBTable
73 /* clear statistic counter for auto_rate */
74 for (ii = 0; ii <= MAX_RATE; ii++) {
75 psNodeDBTable->uTxOk[ii] = 0;
76 psNodeDBTable->uTxFail[ii] = 0;
80 /*--------------------- Export Variables --------------------------*/
82 /*--------------------- Export Functions --------------------------*/
87 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
91 * unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
95 * Return Value: RateIdx
105 /* Erase basicRate flag. */
106 byRate = byRate & 0x7F;/* 0111 1111 */
108 for (ii = 0; ii < MAX_RATE; ii++) {
109 if (acbyIERate[ii] == byRate)
117 * Routine Description:
118 * Rate fallback Algorithm Implementation
122 * pDevice - Pointer to the adapter
123 * psNodeDBTable - Pointer to Node Data Base
130 #define AUTORATE_TXCNT_THRESHOLD 20
131 #define AUTORATE_INC_THRESHOLD 30
136 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
140 * unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
144 * Return Value: RateIdx
154 /* Erase basicRate flag. */
155 byRate = byRate & 0x7F;/* 0111 1111 */
157 for (ii = 0; ii < MAX_RATE; ii++) {
158 if (acbyIERate[ii] == byRate)
168 * Parsing the highest basic & support rate in rate field of frame.
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.
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
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
197 struct vnt_private *pDevice = pDeviceHandler;
199 unsigned char byHighSuppRate = 0;
200 unsigned char byRate = 0;
201 unsigned short wOldBasicRate = pDevice->wBasicRate;
202 unsigned int uRateLen;
204 if (pItemRates == NULL)
208 uRateLen = pItemRates->len;
210 pr_debug("ParseMaxRate Len: %d\n", uRateLen);
211 if (pDevice->eCurrentPHYType != PHY_TYPE_11B) {
212 if (uRateLen > WLAN_RATES_MAXLEN)
213 uRateLen = WLAN_RATES_MAXLEN;
215 if (uRateLen > WLAN_RATES_MAXLEN_11B)
216 uRateLen = WLAN_RATES_MAXLEN_11B;
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 pr_debug("ParseMaxRate AddBasicRate: %d\n",
225 wGetRateIdx(byRate));
227 byRate = (unsigned char)(pItemRates->abyRates[ii]&0x7F);
228 if (byHighSuppRate == 0)
229 byHighSuppRate = byRate;
230 if (byRate > byHighSuppRate)
231 byHighSuppRate = byRate;
232 *pwSuppRate |= (1<<wGetRateIdx(byRate));
234 if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
235 (pDevice->eCurrentPHYType != PHY_TYPE_11B)) {
236 unsigned int uExtRateLen = pItemExtRates->len;
238 if (uExtRateLen > WLAN_RATES_MAXLEN)
239 uExtRateLen = WLAN_RATES_MAXLEN;
241 for (ii = 0; ii < uExtRateLen; ii++) {
242 byRate = (unsigned char)(pItemExtRates->abyRates[ii]);
243 /* select highest basic rate */
244 if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
245 /* Add to basic rate set, update pDevice->byTopCCKBasicRate and pDevice->byTopOFDMBasicRate */
246 CARDbAddBasicRate((void *)pDevice, wGetRateIdx(byRate));
247 pr_debug("ParseMaxRate AddBasicRate: %d\n",
248 wGetRateIdx(byRate));
250 byRate = (unsigned char)(pItemExtRates->abyRates[ii]&0x7F);
251 if (byHighSuppRate == 0)
252 byHighSuppRate = byRate;
253 if (byRate > byHighSuppRate)
254 byHighSuppRate = byRate;
255 *pwSuppRate |= (1<<wGetRateIdx(byRate));
259 if ((pDevice->byPacketType == PK_TYPE_11GB) && CARDbIsOFDMinBasicRate((void *)pDevice))
260 pDevice->byPacketType = PK_TYPE_11GA;
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;
268 *pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
269 if (wOldBasicRate != pDevice->wBasicRate)
270 CARDvSetRSPINF((void *)pDevice, pDevice->eCurrentPHYType);
272 pr_debug("Exit ParseMaxRate\n");
277 * Routine Description:
278 * Rate fallback Algorithm Implementaion
282 * pDevice - Pointer to the adapter
283 * psNodeDBTable - Pointer to Node Data Base
290 #define AUTORATE_TXCNT_THRESHOLD 20
291 #define AUTORATE_INC_THRESHOLD 30
295 void *pDeviceHandler,
296 PKnownNodeDB psNodeDBTable
299 struct vnt_private *pDevice = pDeviceHandler;
300 unsigned short wIdxDownRate = 0;
302 bool bAutoRate[MAX_RATE] = {true, true, true, true, false, false, true, true, true, true, true, true};
303 unsigned long dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180, 240, 360, 480, 540};
304 unsigned long dwThroughput = 0;
305 unsigned short wIdxUpRate = 0;
306 unsigned long dwTxDiff = 0;
308 if (pDevice->pMgmt->eScanState != WMAC_NO_SCANNING)
309 /* Don't do Fallback when scanning Channel */
312 psNodeDBTable->uTimeCount++;
314 if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
315 dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
317 if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
318 (dwTxDiff < AUTORATE_TXFAIL_CNT) &&
319 (psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
323 if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT)
324 psNodeDBTable->uTimeCount = 0;
326 for (ii = 0; ii < MAX_RATE; ii++) {
327 if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
329 wIdxUpRate = (unsigned short) ii;
332 bAutoRate[ii] = false;
336 for (ii = 0; ii <= psNodeDBTable->wTxDataRate; ii++) {
337 if ((psNodeDBTable->uTxOk[ii] != 0) ||
338 (psNodeDBTable->uTxFail[ii] != 0)) {
339 dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
341 psNodeDBTable->uTxFail[ii] *= 4;
343 dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
346 dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
348 wIdxDownRate = psNodeDBTable->wTxDataRate;
349 for (ii = psNodeDBTable->wTxDataRate; ii > 0;) {
351 if ((dwThroughputTbl[ii] > dwThroughput) && bAutoRate[ii]) {
352 dwThroughput = dwThroughputTbl[ii];
353 wIdxDownRate = (unsigned short) ii;
356 psNodeDBTable->wTxDataRate = wIdxDownRate;
357 if (psNodeDBTable->uTxOk[MAX_RATE]) {
358 if (psNodeDBTable->uTxOk[MAX_RATE] >
359 (psNodeDBTable->uTxFail[MAX_RATE] * 4)) {
360 psNodeDBTable->wTxDataRate = wIdxUpRate;
363 /* adhoc, if uTxOk =0 & uTxFail = 0 */
364 if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
365 psNodeDBTable->wTxDataRate = wIdxUpRate;
368 /* 2008-5-8 <add> by chester */
369 TxRate_iwconfig = psNodeDBTable->wTxDataRate;
370 s_vResetCounter(psNodeDBTable);
376 * This routine is used to assemble available Rate IE.
388 PWLAN_IE_SUPP_RATES pSrcRates,
389 PWLAN_IE_SUPP_RATES pDstRates,
390 unsigned int uRateLen
393 unsigned int ii, uu, uRateCnt = 0;
395 if ((pSrcRates == NULL) || (pDstRates == NULL))
398 if (pSrcRates->len == 0)
401 for (ii = 0; ii < uRateLen; ii++) {
402 for (uu = 0; uu < pSrcRates->len; uu++) {
403 if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
404 pDstRates->abyRates[uRateCnt++] = pSrcRates->abyRates[uu];
409 return (unsigned char)uRateCnt;