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authorStefan Sperling <ssperling@sysmocom.de>2018-02-06 17:15:34 +0100
committerStefan Sperling <ssperling@sysmocom.de>2018-02-06 17:15:34 +0100
commit9f9ce9b9cfb03392f6f00a0c495a5ca24f05bf5a (patch)
treeb993279772f69024e1d09208c91f049e7931d515 /src/libcommon/acc_ramp.c
parent8c10ae6de141649c401825192c7d4ea751898cd2 (diff)
initial acc ramping implementation (untested)
Diffstat (limited to 'src/libcommon/acc_ramp.c')
-rw-r--r--src/libcommon/acc_ramp.c110
1 files changed, 101 insertions, 9 deletions
diff --git a/src/libcommon/acc_ramp.c b/src/libcommon/acc_ramp.c
index c8574be2a..124ce8b00 100644
--- a/src/libcommon/acc_ramp.c
+++ b/src/libcommon/acc_ramp.c
@@ -17,31 +17,123 @@
*
*/
+#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 acc_ramp_timer_step(void *data)
+static void deny_all_accs(struct acc_ramp *acc_ramp)
{
- struct acc_ramp *acc_ramp = data;
+ acc_ramp->barred_t2 = 0x03; /* AC8, AC9 barred */
+ acc_ramp->barred_t3 = 0xff; /* AC0 - AC7 barred */
}
-void acc_ramp_init(struct acc_ramp *acc_ramp)
+static void allow_all_accs(struct acc_ramp *acc_ramp)
{
- acc_ramp->barred_t2 = 0x03; /* AC8, AC9 barred */
- acc_ramp->barred_t3 = 0xff; /* AC0 - AC7 barred */
+ 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 acc_ramping_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, acc_ramp_timer_step, acc_ramp);
+ osmo_timer_setup(&acc_ramp->step_timer, acc_ramping_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)
{
- acc_ramp_stop(acc_ramp);
- osmo_timer_schedule(&acc_ramp->step_timer, acc_ramp->step_interval_sec, 0);
+ /* 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);
+ acc_ramping_step(acc_ramp);
}
-void acc_ramp_stop(struct acc_ramp *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);