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
|
/* (C) 2018 Stefan Sperling <ssperling@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <strings.h>
#include <errno.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/acc_ramp.h>
#include <osmocom/bsc/gsm_data.h>
static void deny_all_accs(struct acc_ramp *acc_ramp)
{
acc_ramp->barred_t2 = 0x03; /* AC8, AC9 barred */
acc_ramp->barred_t3 = 0xff; /* AC0 - AC7 barred */
}
static void allow_all_accs(struct acc_ramp *acc_ramp)
{
acc_ramp->barred_t2 = 0x00; /* AC8, AC9 allowed */
acc_ramp->barred_t3 = 0x00; /* AC0 - AC7 allowed */
}
static unsigned int get_next_step_interval(struct acc_ramp *acc_ramp)
{
struct gsm_bts *bts = acc_ramp->bts;
if (acc_ramp->step_interval_is_fixed)
return acc_ramp->step_interval_sec;
if (bts->chan_load_avg == 0) {
acc_ramp->step_interval_sec = ACC_RAMP_STEP_INTERVAL_MIN;
} else {
/* Scale the step interval to current channel load average. */
uint64_t load = (bts->chan_load_avg << 8); /* convert to fixed-point */
acc_ramp->step_interval_sec = ((load * ACC_RAMP_STEP_INTERVAL_MAX) / 100) >> 8;
if (acc_ramp->step_interval_sec < ACC_RAMP_STEP_SIZE_MIN)
acc_ramp->step_interval_sec = ACC_RAMP_STEP_INTERVAL_MIN;
else if (acc_ramp->step_interval_sec > ACC_RAMP_STEP_INTERVAL_MAX)
acc_ramp->step_interval_sec = ACC_RAMP_STEP_INTERVAL_MAX;
}
LOGP(DRLL, LOGL_DEBUG, "(bts=%d) ACC ramp interval set to %u sec based on %u%% load average\n",
bts->nr, acc_ramp->step_interval_sec, bts->chan_load_avg);
return acc_ramp->step_interval_sec;
}
static void do_ramp_step(void *data)
{
struct acc_ramp *acc_ramp = data;
int i;
/* Shortcut in case we only do one ramping step. */
if (acc_ramp->step_size == ACC_RAMP_STEP_SIZE_MAX) {
allow_all_accs(acc_ramp);
return;
}
/* Allow 'step_size' ACCs, starting from ACC0. ACC9 will be allowed last. */
for (i = 0; i < acc_ramp->step_size; i++) {
int c = ffs(acc_ramp->barred_t3);
if (c <= 0) {
c = ffs(acc_ramp->barred_t2);
if (c > 0 && c <= 2)
acc_ramp->barred_t2 &= ~(1 << (c - 1));
return;
}
acc_ramp->barred_t3 &= ~(1 << (c - 1));
}
/* If we have not allowed all ACCs yet, schedule another ramping step. */
if (acc_ramp_get_barred_t2(acc_ramp) != 0x00 ||
acc_ramp_get_barred_t3(acc_ramp) != 0x00)
osmo_timer_schedule(&acc_ramp->step_timer, get_next_step_interval(acc_ramp), 0);
}
void acc_ramp_init(struct acc_ramp *acc_ramp, struct gsm_bts *bts)
{
acc_ramp->bts = bts;
allow_all_accs(acc_ramp);
acc_ramp->step_size = ACC_RAMP_STEP_SIZE_DEFAULT;
acc_ramp->step_interval_sec = ACC_RAMP_STEP_INTERVAL_DEFAULT;
acc_ramp->step_interval_is_fixed = false;
osmo_timer_setup(&acc_ramp->step_timer, do_ramp_step, acc_ramp);
}
int acc_ramp_set_step_size(struct acc_ramp *acc_ramp, enum acc_ramp_step_size step_size)
{
if (step_size < ACC_RAMP_STEP_SIZE_MIN || step_size > ACC_RAMP_STEP_SIZE_MAX)
return -ERANGE;
acc_ramp->step_size = step_size;
return 0;
}
int acc_ramp_set_step_interval(struct acc_ramp *acc_ramp, unsigned int step_interval)
{
if (step_interval < ACC_RAMP_STEP_INTERVAL_MIN || step_interval > ACC_RAMP_STEP_INTERVAL_MAX)
return -ERANGE;
acc_ramp->step_interval_sec = step_interval;
acc_ramp->step_interval_is_fixed = true;
return 0;
}
void acc_ramp_set_step_interval_dynamic(struct acc_ramp *acc_ramp)
{
acc_ramp->step_interval_is_fixed = false;
}
void acc_ramp_start(struct acc_ramp *acc_ramp)
{
/* Abort any previously running ramping process. */
acc_ramp_abort(acc_ramp);
/* Set all ACCs to denied and start ramping up. */
deny_all_accs(acc_ramp);
do_ramp_step(acc_ramp);
}
void acc_ramp_abort(struct acc_ramp *acc_ramp)
{
if (osmo_timer_pending(&acc_ramp->step_timer))
osmo_timer_del(&acc_ramp->step_timer);
}
|
