1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*-
* Copyright (c) 2005 John Bicket
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGES.
*
* $FreeBSD$
*/
/*
* Defintions for the Atheros Wireless LAN controller driver.
*/
#ifndef _DEV_ATH_RATE_SAMPLE_H
#define _DEV_ATH_RATE_SAMPLE_H
/* per-device state */
struct sample_softc {
struct ath_ratectrl arc; /* base class */
int smoothing_rate; /* ewma percentage [0..99] */
int smoothing_minpackets;
int sample_rate; /* %time to try different tx rates */
int max_successive_failures;
int stale_failure_timeout; /* how long to honor max_successive_failures */
int min_switch; /* min time between rate changes */
};
#define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
struct rate_stats {
unsigned average_tx_time;
int successive_failures;
int tries;
int total_packets;
int packets_acked;
unsigned perfect_tx_time; /* transmit time for 0 retries */
int last_tx;
};
struct txschedule {
uint8_t t0, r0; /* series 0: tries, rate code */
uint8_t t1, r1; /* series 1: tries, rate code */
uint8_t t2, r2; /* series 2: tries, rate code */
uint8_t t3, r3; /* series 3: tries, rate code */
};
/*
* for now, we track performance for three different packet
* size buckets
*/
#define NUM_PACKET_SIZE_BINS 2
/* per-node state */
struct sample_node {
int static_rix; /* rate index of fixed tx rate */
#define SAMPLE_MAXRATES 32 /* NB: corresponds to hal info[32] */
uint32_t ratemask; /* bit mask of valid rate indices */
const struct txschedule *sched; /* tx schedule table */
struct rate_stats stats[NUM_PACKET_SIZE_BINS][SAMPLE_MAXRATES];
int last_sample_rix[NUM_PACKET_SIZE_BINS];
int current_sample_rix[NUM_PACKET_SIZE_BINS];
int packets_sent[NUM_PACKET_SIZE_BINS];
int current_rix[NUM_PACKET_SIZE_BINS];
int packets_since_switch[NUM_PACKET_SIZE_BINS];
unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS];
int packets_since_sample[NUM_PACKET_SIZE_BINS];
unsigned sample_tt[NUM_PACKET_SIZE_BINS];
};
#define ATH_NODE_SAMPLE(an) ((struct sample_node *)&(an)[1])
#define IS_RATE_DEFINED(sn, rix) (((sn)->ratemask & (1<<(rix))) != 0)
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
#define WIFI_CW_MIN 31
#define WIFI_CW_MAX 1023
/*
* Definitions for pulling the rate and trie counts from
* a 5212 h/w descriptor. These Don't belong here; the
* driver should record this information so the rate control
* code doesn't go groveling around in the descriptor bits.
*/
#define ds_ctl2 ds_hw[0]
#define ds_ctl3 ds_hw[1]
/* TX ds_ctl2 */
#define AR_XmitDataTries0 0x000f0000 /* series 0 max attempts */
#define AR_XmitDataTries0_S 16
#define AR_XmitDataTries1 0x00f00000 /* series 1 max attempts */
#define AR_XmitDataTries1_S 20
#define AR_XmitDataTries2 0x0f000000 /* series 2 max attempts */
#define AR_XmitDataTries2_S 24
#define AR_XmitDataTries3 0xf0000000 /* series 3 max attempts */
#define AR_XmitDataTries3_S 28
/* TX ds_ctl3 */
#define AR_XmitRate0 0x0000001f /* series 0 tx rate */
#define AR_XmitRate0_S 0
#define AR_XmitRate1 0x000003e0 /* series 1 tx rate */
#define AR_XmitRate1_S 5
#define AR_XmitRate2 0x00007c00 /* series 2 tx rate */
#define AR_XmitRate2_S 10
#define AR_XmitRate3 0x000f8000 /* series 3 tx rate */
#define AR_XmitRate3_S 15
/* TX ds_ctl3 for 5416 */
#define AR5416_XmitRate0 0x000000ff /* series 0 tx rate */
#define AR5416_XmitRate0_S 0
#define AR5416_XmitRate1 0x0000ff00 /* series 1 tx rate */
#define AR5416_XmitRate1_S 8
#define AR5416_XmitRate2 0x00ff0000 /* series 2 tx rate */
#define AR5416_XmitRate2_S 16
#define AR5416_XmitRate3 0xff000000 /* series 3 tx rate */
#define AR5416_XmitRate3_S 24
#define MS(_v, _f) (((_v) & (_f)) >> _f##_S)
/*
* Calculate the transmit duration of a frame.
*/
static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
int length,
int rix, int short_retries, int long_retries) {
const HAL_RATE_TABLE *rt = sc->sc_currates;
struct ifnet *ifp = sc->sc_ifp;
struct ieee80211com *ic = ifp->if_l2com;
int rts, cts;
unsigned t_slot = 20;
unsigned t_difs = 50;
unsigned t_sifs = 10;
int tt = 0;
int x = 0;
int cw = WIFI_CW_MIN;
int cix;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
if (rix >= rt->rateCount) {
printf("bogus rix %d, max %u, mode %u\n",
rix, rt->rateCount, sc->sc_curmode);
return 0;
}
cix = rt->info[rix].controlRate;
/*
* XXX getting mac/phy level timings should be fixed for turbo
* rates, and there is probably a way to get this from the
* hal...
*/
switch (rt->info[rix].phy) {
case IEEE80211_T_OFDM:
t_slot = 9;
t_sifs = 16;
t_difs = 28;
/* fall through */
case IEEE80211_T_TURBO:
t_slot = 9;
t_sifs = 8;
t_difs = 28;
break;
case IEEE80211_T_DS:
/* fall through to default */
default:
/* pg 205 ieee.802.11.pdf */
t_slot = 20;
t_difs = 50;
t_sifs = 10;
}
rts = cts = 0;
if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
rt->info[rix].phy == IEEE80211_T_OFDM) {
if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
rts = 1;
else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
cts = 1;
cix = rt->info[sc->sc_protrix].controlRate;
}
if (0 /*length > ic->ic_rtsthreshold */) {
rts = 1;
}
if (rts || cts) {
int ctsrate;
int ctsduration = 0;
/* NB: this is intentionally not a runtime check */
KASSERT(cix < rt->rateCount,
("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount,
sc->sc_curmode));
ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble;
if (rts) /* SIFS + CTS */
ctsduration += rt->info[cix].spAckDuration;
ctsduration += ath_hal_computetxtime(sc->sc_ah,
rt, length, rix, AH_TRUE);
if (cts) /* SIFS + ACK */
ctsduration += rt->info[cix].spAckDuration;
tt += (short_retries + 1) * ctsduration;
}
tt += t_difs;
tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length,
rix, AH_TRUE);
for (x = 0; x <= short_retries + long_retries; x++) {
cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
tt += (t_slot * cw/2);
}
return tt;
}
#endif /* _DEV_ATH_RATE_SAMPLE_H */
|
