diff options
Diffstat (limited to 'src/libcommon/acc_ramp.c')
-rw-r--r-- | src/libcommon/acc_ramp.c | 110 |
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); |