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 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};
57 #define AUTORATE_TXOK_CNT 0x0400
58 #define AUTORATE_TXFAIL_CNT 0x0064
59 #define AUTORATE_TIMEOUT 10
61 /*--------------------- Static Functions --------------------------*/
64 PKnownNodeDB psNodeDBTable
69 PKnownNodeDB psNodeDBTable
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;
81 /*--------------------- Export Variables --------------------------*/
83 /*--------------------- Export Functions --------------------------*/
88 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
92 * unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
96 * Return Value: RateIdx
100 DATARATEbyGetRateIdx(
106 //Erase basicRate flag.
107 byRate = byRate & 0x7F;//0111 1111
109 for (ii = 0; ii < MAX_RATE; ii++) {
110 if (acbyIERate[ii] == byRate)
118 * Routine Description:
119 * Rate fallback Algorithm Implementation
123 * pDevice - Pointer to the adapter
124 * psNodeDBTable - Pointer to Node Data Base
131 #define AUTORATE_TXCNT_THRESHOLD 20
132 #define AUTORATE_INC_THRESHOLD 30
137 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
141 * unsigned char - Rate value in SuppRates IE or ExtSuppRates IE
145 * Return Value: RateIdx
155 //Erase basicRate flag.
156 byRate = byRate & 0x7F;//0111 1111
158 for (ii = 0; ii < MAX_RATE; ii++) {
159 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 PSDevice pDevice = (PSDevice) 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 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;
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 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "ParseMaxRate AddBasicRate: %d\n", wGetRateIdx(byRate));
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));
233 if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
234 (pDevice->eCurrentPHYType != PHY_TYPE_11B)) {
235 unsigned int uExtRateLen = pItemExtRates->len;
237 if (uExtRateLen > WLAN_RATES_MAXLEN)
238 uExtRateLen = WLAN_RATES_MAXLEN;
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));
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));
256 } //if (pItemExtRates != NULL)
258 if ((pDevice->byPacketType == PK_TYPE_11GB) && CARDbIsOFDMinBasicRate((void *)pDevice)) {
259 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 DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "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 PSDevice pDevice = (PSDevice) pDeviceHandler;
300 unsigned short wIdxDownRate = 0;
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;
309 if (pDevice->pMgmt->eScanState != WMAC_NO_SCANNING) {
310 // Don't do Fallback when scanning Channel
314 psNodeDBTable->uTimeCount++;
316 if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
317 dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
319 if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
320 (dwTxDiff < AUTORATE_TXFAIL_CNT) &&
321 (psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
325 if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT) {
326 psNodeDBTable->uTimeCount = 0;
329 for (ii = 0; ii < MAX_RATE; ii++) {
330 if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
332 wIdxUpRate = (unsigned short) ii;
335 bAutoRate[ii] = false;
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];
344 psNodeDBTable->uTxFail[ii] *= 4;
346 dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
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]);
351 dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
353 wIdxDownRate = psNodeDBTable->wTxDataRate;
354 for (ii = psNodeDBTable->wTxDataRate; ii > 0;) {
356 if ((dwThroughputTbl[ii] > dwThroughput) && bAutoRate[ii]) {
357 dwThroughput = dwThroughputTbl[ii];
358 wIdxDownRate = (unsigned short) ii;
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;
367 } else { // adhoc, if uTxOk =0 & uTxFail = 0
368 if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
369 psNodeDBTable->wTxDataRate = wIdxUpRate;
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);
382 * This routine is used to assemble available Rate IE.
394 PWLAN_IE_SUPP_RATES pSrcRates,
395 PWLAN_IE_SUPP_RATES pDstRates,
396 unsigned int uRateLen
399 unsigned int ii, uu, uRateCnt = 0;
401 if ((pSrcRates == NULL) || (pDstRates == NULL))
404 if (pSrcRates->len == 0)
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];
415 return (unsigned char)uRateCnt;