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.
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};
50 #define AUTORATE_TXOK_CNT 0x0400
51 #define AUTORATE_TXFAIL_CNT 0x0064
52 #define AUTORATE_TIMEOUT 10
54 void s_vResetCounter(PKnownNodeDB psNodeDBTable
);
56 void s_vResetCounter(PKnownNodeDB psNodeDBTable
)
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;
69 * Routine Description:
70 * Rate fallback Algorithm Implementaion
74 * pDevice - Pointer to the adapter
75 * psNodeDBTable - Pointer to Node Data Base
82 #define AUTORATE_TXCNT_THRESHOLD 20
83 #define AUTORATE_INC_THRESHOLD 30
88 * Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
92 * u8 - Rate value in SuppRates IE or ExtSuppRates IE
96 * Return Value: RateIdx
99 u16
RATEwGetRateIdx(u8 byRate
)
103 /* erase BasicRate flag */
104 byRate
= byRate
& 0x7F;
106 for (ii
= 0; ii
< MAX_RATE
; ii
++) {
107 if (acbyIERate
[ii
] == byRate
)
116 * Parsing the highest basic & support rate in rate field of frame.
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.
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
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
)
139 u8 byHighSuppRate
= 0, byRate
= 0;
140 u16 wOldBasicRate
= pDevice
->wBasicRate
;
143 if (pItemRates
== NULL
)
147 uRateLen
= pItemRates
->len
;
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
;
154 if (uRateLen
> WLAN_RATES_MAXLEN_11B
)
155 uRateLen
= WLAN_RATES_MAXLEN_11B
;
158 for (ii
= 0; ii
< uRateLen
; ii
++) {
159 byRate
= (u8
)(pItemRates
->abyRates
[ii
]);
160 if (WLAN_MGMT_IS_BASICRATE(byRate
) &&
161 (bUpdateBasicRate
== true)) {
163 * add to basic rate set, update pDevice->byTopCCKBasicRate and
164 * pDevice->byTopOFDMBasicRate
166 CARDbAddBasicRate((void *)pDevice
, RATEwGetRateIdx(byRate
));
167 DBG_PRT(MSG_LEVEL_DEBUG
,
168 KERN_INFO
"ParseMaxRate AddBasicRate: %d\n",
169 RATEwGetRateIdx(byRate
));
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
));
178 if ((pItemExtRates
!= NULL
) && (pItemExtRates
->byElementID
== WLAN_EID_EXTSUPP_RATES
) &&
179 (pDevice
->byBBType
!= BB_TYPE_11B
)) {
181 unsigned int uExtRateLen
= pItemExtRates
->len
;
183 if (uExtRateLen
> WLAN_RATES_MAXLEN
)
184 uExtRateLen
= WLAN_RATES_MAXLEN
;
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
])) {
191 * add to basic rate set, update pDevice->byTopCCKBasicRate and
192 * pDevice->byTopOFDMBasicRate
194 CARDbAddBasicRate((void *)pDevice
, RATEwGetRateIdx(byRate
));
195 DBG_PRT(MSG_LEVEL_DEBUG
,
196 KERN_INFO
"ParseMaxRate AddBasicRate: %d\n",
197 RATEwGetRateIdx(byRate
));
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
));
206 /* DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n",
207 * RATEwGetRateIdx(byRate), byRate));
212 if ((pDevice
->byPacketType
== PK_TYPE_11GB
)
213 && CARDbIsOFDMinBasicRate((void *)pDevice
)) {
214 pDevice
->byPacketType
= PK_TYPE_11GA
;
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
;
223 *pwMaxBasicRate
= pDevice
->byTopOFDMBasicRate
;
224 if (wOldBasicRate
!= pDevice
->wBasicRate
)
225 CARDvSetRSPINF((void *)pDevice
, pDevice
->byBBType
);
227 DBG_PRT(MSG_LEVEL_DEBUG
, KERN_INFO
"Exit ParseMaxRate\n");
232 * Routine Description:
233 * Rate fallback Algorithm Implementaion
237 * pDevice - Pointer to the adapter
238 * psNodeDBTable - Pointer to Node Data Base
245 #define AUTORATE_TXCNT_THRESHOLD 20
246 #define AUTORATE_INC_THRESHOLD 30
248 void RATEvTxRateFallBack(struct vnt_private
*pDevice
,
249 PKnownNodeDB psNodeDBTable
)
251 struct vnt_manager
*pMgmt
= &pDevice
->vnt_mgmt
;
252 u16 wIdxDownRate
= 0;
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,
258 u32 dwThroughput
= 0;
262 if (pMgmt
->eScanState
!= WMAC_NO_SCANNING
)
263 return; /* Don't do Fallback when scanning Channel */
265 psNodeDBTable
->uTimeCount
++;
267 if (psNodeDBTable
->uTxFail
[MAX_RATE
] > psNodeDBTable
->uTxOk
[MAX_RATE
])
268 dwTxDiff
= psNodeDBTable
->uTxFail
[MAX_RATE
] - psNodeDBTable
->uTxOk
[MAX_RATE
];
270 if ((psNodeDBTable
->uTxOk
[MAX_RATE
] < AUTORATE_TXOK_CNT
) &&
271 (dwTxDiff
< AUTORATE_TXFAIL_CNT
) &&
272 (psNodeDBTable
->uTimeCount
< AUTORATE_TIMEOUT
)) {
276 if (psNodeDBTable
->uTimeCount
>= AUTORATE_TIMEOUT
)
277 psNodeDBTable
->uTimeCount
= 0;
279 for (ii
= 0; ii
< MAX_RATE
; ii
++) {
280 if (psNodeDBTable
->wSuppRate
& (0x0001<<ii
)) {
281 if (bAutoRate
[ii
] == true)
282 wIdxUpRate
= (u16
) ii
;
284 bAutoRate
[ii
] = false;
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
];
293 psNodeDBTable
->uTxFail
[ii
] *= 4;
294 dwThroughputTbl
[ii
] /= (psNodeDBTable
->uTxOk
[ii
] + psNodeDBTable
->uTxFail
[ii
]);
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
]);
299 dwThroughput
= dwThroughputTbl
[psNodeDBTable
->wTxDataRate
];
301 wIdxDownRate
= psNodeDBTable
->wTxDataRate
;
302 for (ii
= psNodeDBTable
->wTxDataRate
; ii
> 0;) {
304 if ((dwThroughputTbl
[ii
] > dwThroughput
) &&
305 (bAutoRate
[ii
] == true)) {
306 dwThroughput
= dwThroughputTbl
[ii
];
307 wIdxDownRate
= (u16
) ii
;
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
;
316 } else { /* adhoc, if uTxOk(total) == 0 & uTxFail(total) == 0 */
317 if (psNodeDBTable
->uTxFail
[MAX_RATE
] == 0)
318 psNodeDBTable
->wTxDataRate
= wIdxUpRate
;
321 if (pDevice
->byBBType
== BB_TYPE_11A
) {
322 if (psNodeDBTable
->wTxDataRate
<= RATE_11M
)
323 psNodeDBTable
->wTxDataRate
= RATE_6M
;
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
);
334 * This routine is used to assemble available Rate IE.
344 u8
RATEuSetIE(PWLAN_IE_SUPP_RATES pSrcRates
, PWLAN_IE_SUPP_RATES pDstRates
,
345 unsigned int uRateLen
)
347 unsigned int ii
, uu
, uRateCnt
= 0;
349 if ((pSrcRates
== NULL
) || (pDstRates
== NULL
))
352 if (pSrcRates
->len
== 0)
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
];