649 lines
22 KiB
C
649 lines
22 KiB
C
/* (C) 2018-2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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*
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* Author: Stefan Sperling <ssperling@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <strings.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/acc.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/chan_alloc.h>
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#include <osmocom/bsc/signal.h>
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#include <osmocom/bsc/abis_nm.h>
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#include <osmocom/bsc/bts.h>
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/*
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* Check if an ACC has been permanently barred for a BTS,
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* e.g. with the 'rach access-control-class' VTY command.
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*/
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static bool acc_is_permanently_barred(struct gsm_bts *bts, unsigned int acc)
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{
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OSMO_ASSERT(acc <= 9);
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if (acc == 8 || acc == 9)
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return (bts->si_common.rach_control.t2 & (1 << (acc - 8)));
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return (bts->si_common.rach_control.t3 & (1 << (acc)));
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}
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/*!
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* Return bitmasks which correspond to access control classes that are currently
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* denied access. Ramping is only concerned with those bits which control access
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* for ACCs 0-9, and any of the other bits will always be set to zero in these masks, i.e.
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* it is safe to OR these bitmasks with the corresponding fields in struct gsm48_rach_control.
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* \param[in] acc_mgr Pointer to acc_mgr structure.
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*/
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static inline uint8_t acc_mgr_get_barred_t2(struct acc_mgr *acc_mgr)
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{
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return ((~acc_mgr->allowed_subset_mask) >> 8) & 0x03;
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};
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static inline uint8_t acc_mgr_get_barred_t3(struct acc_mgr *acc_mgr)
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{
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return (~acc_mgr->allowed_subset_mask) & 0xff;
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}
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static uint8_t acc_mgr_subset_len(struct acc_mgr *acc_mgr)
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{
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return OSMO_MIN(acc_mgr->len_allowed_ramp, acc_mgr->len_allowed_adm);
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}
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static void acc_mgr_enable_rotation_cond(struct acc_mgr *acc_mgr)
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{
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if (acc_mgr->allowed_permanent_count && acc_mgr->allowed_subset_mask_count &&
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acc_mgr->allowed_permanent_count != acc_mgr->allowed_subset_mask_count) {
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if (!osmo_timer_pending(&acc_mgr->rotate_timer))
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osmo_timer_schedule(&acc_mgr->rotate_timer, acc_mgr->rotation_time_sec, 0);
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} else {
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/* No rotation needed, disable rotation timer */
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if (osmo_timer_pending(&acc_mgr->rotate_timer))
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osmo_timer_del(&acc_mgr->rotate_timer);
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}
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}
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static void acc_mgr_gen_subset(struct acc_mgr *acc_mgr, bool update_si)
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{
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uint8_t acc;
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acc_mgr->allowed_subset_mask = 0; /* clean mask */
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acc_mgr->allowed_subset_mask_count = 0;
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acc_mgr->allowed_permanent_count = 0;
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for (acc = 0; acc < 10; acc++) {
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if (acc_is_permanently_barred(acc_mgr->bts, acc))
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continue;
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acc_mgr->allowed_permanent_count++;
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if (acc_mgr->allowed_subset_mask_count < acc_mgr_subset_len(acc_mgr)) {
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acc_mgr->allowed_subset_mask |= (1 << acc);
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acc_mgr->allowed_subset_mask_count++;
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}
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}
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acc_mgr_enable_rotation_cond(acc_mgr);
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LOG_BTS(acc_mgr->bts, DRSL, LOGL_INFO,
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"ACC: New ACC allowed subset 0x%03" PRIx16 " (active_len=%" PRIu8
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", ramp_len=%" PRIu8 ", adm_len=%" PRIu8 ", perm_len=%" PRIu8 ", rotation=%s)\n",
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acc_mgr->allowed_subset_mask, acc_mgr->allowed_subset_mask_count,
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acc_mgr->len_allowed_ramp, acc_mgr->len_allowed_adm,
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acc_mgr->allowed_permanent_count,
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osmo_timer_pending(&(acc_mgr)->rotate_timer) ? "on" : "off");
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/* Trigger SI data update, acc_mgr_apply_acc will bew called */
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if (update_si)
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gsm_bts_set_system_infos(acc_mgr->bts);
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}
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static uint8_t get_highest_allowed_acc(uint16_t mask)
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{
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int i;
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for (i = 9; i >= 0; i--) {
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if (mask & (1 << i))
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return i;
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}
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OSMO_ASSERT(0);
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return 0;
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}
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static uint8_t get_lowest_allowed_acc(uint16_t mask)
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{
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int i;
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for (i = 0; i < 10; i++) {
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if (mask & (1 << i))
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return i;
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}
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OSMO_ASSERT(0);
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return 0;
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}
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#define LOG_ACC_CHG(acc_mgr, level, old_mask, verb_str) \
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LOG_BTS((acc_mgr)->bts, DRSL, level, \
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"ACC: %s ACC allowed active subset 0x%03" PRIx16 " -> 0x%03" PRIx16 \
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" (active_len=%" PRIu8 ", ramp_len=%" PRIu8 ", adm_len=%" PRIu8 \
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", perm_len=%" PRIu8 ", rotation=%s)\n", \
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verb_str, old_mask, (acc_mgr)->allowed_subset_mask, \
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(acc_mgr)->allowed_subset_mask_count, \
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(acc_mgr)->len_allowed_ramp, (acc_mgr)->len_allowed_adm, \
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(acc_mgr)->allowed_permanent_count, \
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osmo_timer_pending(&(acc_mgr)->rotate_timer) ? "on" : "off")
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/* Call when either adm_len or ramp_len changed (and values have been updated) */
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static void acc_mgr_subset_length_changed(struct acc_mgr *acc_mgr)
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{
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uint16_t old_mask = acc_mgr->allowed_subset_mask;
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uint8_t curr_len = acc_mgr->allowed_subset_mask_count;
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uint8_t new_len = acc_mgr_subset_len(acc_mgr);
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int8_t diff = new_len - curr_len;
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uint8_t i;
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if (curr_len == new_len)
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return;
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if (new_len == 0) {
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acc_mgr->allowed_subset_mask = 0;
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acc_mgr->allowed_subset_mask_count = 0;
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acc_mgr_enable_rotation_cond(acc_mgr);
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LOG_ACC_CHG(acc_mgr, LOGL_INFO, old_mask, "update");
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gsm_bts_set_system_infos(acc_mgr->bts);
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return;
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}
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if (curr_len == 0) {
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acc_mgr_gen_subset(acc_mgr, true);
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return;
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}
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/* Try to add new ACCs to the set starting from highest one (since we rotate rolling up) */
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if (diff > 0) { /* curr_len < new_len */
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uint8_t highest = get_highest_allowed_acc(acc_mgr->allowed_subset_mask);
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/* It's fine skipping highest in the loop since it's known to be already set: */
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for (i = (highest + 1) % 10; i != highest; i = (i + 1) % 10) {
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if (acc_is_permanently_barred(acc_mgr->bts, i))
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continue;
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if (acc_mgr->allowed_subset_mask & (1 << i))
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continue; /* already in set */
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acc_mgr->allowed_subset_mask |= (1 << i);
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acc_mgr->allowed_subset_mask_count++;
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diff--;
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if (diff == 0)
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break;
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}
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} else { /* curr_len > new_len, try removing from lowest one. */
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uint8_t lowest = get_lowest_allowed_acc(acc_mgr->allowed_subset_mask);
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i = lowest;
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do {
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if ((acc_mgr->allowed_subset_mask & (1 << i))) {
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acc_mgr->allowed_subset_mask &= ~(1 << i);
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acc_mgr->allowed_subset_mask_count--;
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diff++;
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if (diff == 0)
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break;
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}
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i = (i + 1) % 10;
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} while(i != lowest);
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}
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acc_mgr_enable_rotation_cond(acc_mgr);
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LOG_ACC_CHG(acc_mgr, LOGL_INFO, old_mask, "update");
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/* if we updated the set, notify about it */
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if (curr_len != acc_mgr->allowed_subset_mask_count)
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gsm_bts_set_system_infos(acc_mgr->bts);
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}
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/* Eg: (2,3,4) -> first=2; last=4. (3,7,8) -> first=3, last=8; (8,9,2) -> first=8, last=2 */
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void get_subset_limits(struct acc_mgr *acc_mgr, uint8_t *first, uint8_t *last)
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{
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uint8_t lowest = get_lowest_allowed_acc(acc_mgr->allowed_subset_mask);
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uint8_t highest = get_highest_allowed_acc(acc_mgr->allowed_subset_mask);
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/* check if there's unselected ACCs between lowest and highest, that
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* means subset is wrapping around, eg: (8,9,1)
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* Assumption: The permanent set is bigger than the current selected subset */
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bool is_wrapped = false;
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uint8_t i = (lowest + 1) % 10;
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if (lowest != highest) { /* len(allowed_subset_mask) > 1 */
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i = (lowest + 1) % 10;
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do {
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if (!acc_is_permanently_barred(acc_mgr->bts, i) &&
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!(acc_mgr->allowed_subset_mask & (1 << i))) {
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is_wrapped = true;
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break;
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}
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i = (i + 1) % 10;
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} while (i != (highest + 1) % 10);
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}
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if (is_wrapped) {
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/* Assumption: "i" is pointing to the lowest dynamically barred ACC.
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Example: 11 1000 00>0<1. */
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*last = i - 1;
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while (acc_is_permanently_barred(acc_mgr->bts, *last))
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*last -= 1;
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*first = i + 1;
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while (acc_is_permanently_barred(acc_mgr->bts, *first) ||
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!(acc_mgr->allowed_subset_mask & (1 << (*first))))
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*first += 1;
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} else {
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*first = lowest;
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*last = highest;
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}
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}
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static void do_acc_rotate_step(void *data)
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{
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struct acc_mgr *acc_mgr = data;
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uint8_t i;
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uint8_t first, last;
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uint16_t old_mask = acc_mgr->allowed_subset_mask;
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/* Assumption: The size of the subset didn't change, that's handled by
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* acc_mgr_subset_length_changed()
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*/
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/* Assumption: Rotation timer has been disabled if no ACC is allowed */
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OSMO_ASSERT(acc_mgr->allowed_subset_mask_count != 0);
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/* One ACC is rotated at a time: Drop first ACC and add next from last ACC */
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get_subset_limits(acc_mgr, &first, &last);
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acc_mgr->allowed_subset_mask &= ~(1 << first);
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i = (last + 1) % 10;
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do {
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if (!acc_is_permanently_barred(acc_mgr->bts, i) &&
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!(acc_mgr->allowed_subset_mask & (1 << i))) {
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/* found first one which can be allowed, do it and be done */
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acc_mgr->allowed_subset_mask |= (1 << i);
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break;
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}
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i = (i + 1 ) % 10;
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} while (i != (last + 1) % 10);
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osmo_timer_schedule(&acc_mgr->rotate_timer, acc_mgr->rotation_time_sec, 0);
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if (old_mask != acc_mgr->allowed_subset_mask) {
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LOG_ACC_CHG(acc_mgr, LOGL_INFO, old_mask, "rotate");
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gsm_bts_set_system_infos(acc_mgr->bts);
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}
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}
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void acc_mgr_init(struct acc_mgr *acc_mgr, struct gsm_bts *bts)
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{
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acc_mgr->bts = bts;
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acc_mgr->len_allowed_adm = 10; /* Allow all by default */
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acc_mgr->len_allowed_ramp = 10;
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acc_mgr->rotation_time_sec = ACC_MGR_QUANTUM_DEFAULT;
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osmo_timer_setup(&acc_mgr->rotate_timer, do_acc_rotate_step, acc_mgr);
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/* FIXME: Don't update SI yet, avoid crash due to bts->model being NULL */
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acc_mgr_gen_subset(acc_mgr, false);
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}
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uint8_t acc_mgr_get_len_allowed_adm(struct acc_mgr *acc_mgr)
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{
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return acc_mgr->len_allowed_adm;
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}
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uint8_t acc_mgr_get_len_allowed_ramp(struct acc_mgr *acc_mgr)
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{
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return acc_mgr->len_allowed_ramp;
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}
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void acc_mgr_set_len_allowed_adm(struct acc_mgr *acc_mgr, uint8_t len_allowed_adm)
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{
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uint8_t old_len;
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OSMO_ASSERT(len_allowed_adm <= 10);
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if (acc_mgr->len_allowed_adm == len_allowed_adm)
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return;
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LOG_BTS(acc_mgr->bts, DRSL, LOGL_DEBUG,
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"ACC: administrative rotate subset size set to %" PRIu8 "\n", len_allowed_adm);
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old_len = acc_mgr_subset_len(acc_mgr);
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acc_mgr->len_allowed_adm = len_allowed_adm;
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if (old_len != acc_mgr_subset_len(acc_mgr))
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acc_mgr_subset_length_changed(acc_mgr);
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}
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void acc_mgr_set_len_allowed_ramp(struct acc_mgr *acc_mgr, uint8_t len_allowed_ramp)
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{
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uint8_t old_len;
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OSMO_ASSERT(len_allowed_ramp <= 10);
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if (acc_mgr->len_allowed_ramp == len_allowed_ramp)
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return;
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LOG_BTS(acc_mgr->bts, DRSL, LOGL_DEBUG,
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"ACC: ramping rotate subset size set to %" PRIu8 "\n", len_allowed_ramp);
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old_len = acc_mgr_subset_len(acc_mgr);
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acc_mgr->len_allowed_ramp = len_allowed_ramp;
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if (old_len != acc_mgr_subset_len(acc_mgr))
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acc_mgr_subset_length_changed(acc_mgr);
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}
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void acc_mgr_set_rotation_time(struct acc_mgr *acc_mgr, uint32_t rotation_time_sec)
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{
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LOG_BTS(acc_mgr->bts, DRSL, LOGL_DEBUG,
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"ACC: rotate subset time set to %" PRIu32 " seconds\n", rotation_time_sec);
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acc_mgr->rotation_time_sec = rotation_time_sec;
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}
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void acc_mgr_perm_subset_changed(struct acc_mgr *acc_mgr, struct gsm48_rach_control *rach_control)
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{
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/* Even if amount is the same, the allowed/barred ones may have changed,
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* so let's retrigger generation of an entire subset rather than
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* rotating it */
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acc_mgr_gen_subset(acc_mgr, true);
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}
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/*!
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* Potentially mark certain Access Control Classes (ACCs) as barred in accordance to ACC policy.
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* \param[in] acc_mgr Pointer to acc_mgr structure.
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* \param[in] rach_control RACH control parameters in which barred ACCs will be configured.
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*/
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void acc_mgr_apply_acc(struct acc_mgr *acc_mgr, struct gsm48_rach_control *rach_control)
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{
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rach_control->t2 |= acc_mgr_get_barred_t2(acc_mgr);
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rach_control->t3 |= acc_mgr_get_barred_t3(acc_mgr);
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}
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//////////////////////////
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// acc_ramp
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//////////////////////////
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static void do_acc_ramping_step(void *data)
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{
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struct acc_ramp *acc_ramp = data;
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struct gsm_bts *bts = acc_ramp->bts;
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struct acc_mgr *acc_mgr = &bts->acc_mgr;
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uint8_t old_len = acc_mgr_get_len_allowed_ramp(acc_mgr);
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uint8_t new_len = old_len;
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/* Remark dec: Never decrease back to 0, it is desirable to always allow at
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* least 1 ACC at ramping lvl to allow subscribers to eventually use the
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* network. If total barring is desired, it can be controlled by the
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* adminsitrative subset length through VTY.
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* Remark inc: Never try going over the admin subset size, since it
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* wouldn't change final subset size anyway and it would create a fake
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* sense of safe load handling capacity. If then load became high, being
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* on upper size would mean the BTS requires more time to effectively
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* drop down the final subset size, hence delaying recovery.
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*/
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if (bts->chan_load_avg > acc_ramp->chan_load_upper_threshold)
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new_len = (uint8_t)OSMO_MAX(1, (int)(old_len - acc_ramp->step_size));
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else if (bts->chan_load_avg < acc_ramp->chan_load_lower_threshold)
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new_len = OSMO_MIN(acc_mgr_get_len_allowed_adm(acc_mgr),
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old_len + acc_ramp->step_size);
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else
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new_len = old_len;
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if (new_len != old_len) {
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LOG_BTS(bts, DRSL, LOGL_DEBUG,
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"ACC RAMP: changing ramping subset size %" PRIu8
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" -> %" PRIu8 ", chan_load_avg=%" PRIu8 "%%\n",
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old_len, new_len, bts->chan_load_avg);
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acc_mgr_set_len_allowed_ramp(acc_mgr, new_len);
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}
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osmo_timer_schedule(&acc_ramp->step_timer, acc_ramp->step_interval_sec, 0);
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}
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/* Implements osmo_signal_cbfn() -- trigger or abort ACC ramping upon changes RF lock state. */
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static int acc_ramp_nm_sig_cb(unsigned int subsys, unsigned int signal, void *handler_data, void *signal_data)
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{
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struct nm_statechg_signal_data *nsd = signal_data;
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struct acc_ramp *acc_ramp = handler_data;
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struct gsm_bts_trx *trx = NULL;
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bool trigger_ramping = false, abort_ramping = false;
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/* Handled signals map to an Administrative State Change ACK, or a State Changed Event Report. */
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if (signal != S_NM_STATECHG_ADM && signal != S_NM_STATECHG_OPER)
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return 0;
|
|
|
|
if (nsd->obj_class != NM_OC_RADIO_CARRIER)
|
|
return 0;
|
|
|
|
trx = nsd->obj;
|
|
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG, "ACC RAMP: administrative state %s -> %s\n",
|
|
get_value_string(abis_nm_adm_state_names, nsd->old_state->administrative),
|
|
get_value_string(abis_nm_adm_state_names, nsd->new_state->administrative));
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG, "ACC RAMP: operational state %s -> %s\n",
|
|
abis_nm_opstate_name(nsd->old_state->operational),
|
|
abis_nm_opstate_name(nsd->new_state->operational));
|
|
|
|
/* We only care about state changes of the first TRX. */
|
|
if (trx->nr != 0)
|
|
return 0;
|
|
|
|
/* RSL must already be up. We cannot send RACH system information to the BTS otherwise. */
|
|
if (trx->rsl_link == NULL) {
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG,
|
|
"ACC RAMP: ignoring state change because RSL link is down\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Trigger or abort ACC ramping based on the new state of this TRX. */
|
|
if (nsd->old_state->administrative != nsd->new_state->administrative) {
|
|
switch (nsd->new_state->administrative) {
|
|
case NM_STATE_UNLOCKED:
|
|
if (nsd->old_state->operational != nsd->new_state->operational) {
|
|
/*
|
|
* Administrative and operational state have both changed.
|
|
* Trigger ramping only if TRX 0 will be both enabled and unlocked.
|
|
*/
|
|
if (nsd->new_state->operational == NM_OPSTATE_ENABLED)
|
|
trigger_ramping = true;
|
|
else
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG,
|
|
"ACC RAMP: ignoring state change because TRX is "
|
|
"transitioning into operational state '%s'\n",
|
|
abis_nm_opstate_name(nsd->new_state->operational));
|
|
} else {
|
|
/*
|
|
* Operational state has not changed.
|
|
* Trigger ramping only if TRX 0 is already usable.
|
|
*/
|
|
if (trx_is_usable(trx))
|
|
trigger_ramping = true;
|
|
else
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG, "ACC RAMP: ignoring state change "
|
|
"because TRX is not usable\n");
|
|
}
|
|
break;
|
|
case NM_STATE_LOCKED:
|
|
case NM_STATE_SHUTDOWN:
|
|
abort_ramping = true;
|
|
break;
|
|
case NM_STATE_NULL:
|
|
default:
|
|
LOG_TRX(trx, DRSL, LOGL_ERROR, "ACC RAMP: unrecognized administrative state '0x%x' "
|
|
"reported for TRX 0\n", nsd->new_state->administrative);
|
|
break;
|
|
}
|
|
}
|
|
if (nsd->old_state->operational != nsd->new_state->operational) {
|
|
switch (nsd->new_state->operational) {
|
|
case NM_OPSTATE_ENABLED:
|
|
if (nsd->old_state->administrative != nsd->new_state->administrative) {
|
|
/*
|
|
* Administrative and operational state have both changed.
|
|
* Trigger ramping only if TRX 0 will be both enabled and unlocked.
|
|
*/
|
|
if (nsd->new_state->administrative == NM_STATE_UNLOCKED)
|
|
trigger_ramping = true;
|
|
else
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG, "ACC RAMP: ignoring state change "
|
|
"because TRX is transitioning into administrative state '%s'\n",
|
|
get_value_string(abis_nm_adm_state_names, nsd->new_state->administrative));
|
|
} else {
|
|
/*
|
|
* Administrative state has not changed.
|
|
* Trigger ramping only if TRX 0 is already unlocked.
|
|
*/
|
|
if (trx->mo.nm_state.administrative == NM_STATE_UNLOCKED)
|
|
trigger_ramping = true;
|
|
else
|
|
LOG_TRX(trx, DRSL, LOGL_DEBUG, "ACC RAMP: ignoring state change "
|
|
"because TRX is in administrative state '%s'\n",
|
|
get_value_string(abis_nm_adm_state_names, trx->mo.nm_state.administrative));
|
|
}
|
|
break;
|
|
case NM_OPSTATE_DISABLED:
|
|
abort_ramping = true;
|
|
break;
|
|
case NM_OPSTATE_NULL:
|
|
default:
|
|
LOG_TRX(trx, DRSL, LOGL_ERROR, "ACC RAMP: unrecognized operational state '0x%x' "
|
|
"reported for TRX 0\n", nsd->new_state->administrative);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (trigger_ramping)
|
|
acc_ramp_trigger(acc_ramp);
|
|
else if (abort_ramping)
|
|
acc_ramp_abort(acc_ramp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* Initialize an acc_ramp data structure.
|
|
* Storage for this structure must be provided by the caller.
|
|
*
|
|
* By default, ACC ramping is disabled and all ACCs are allowed.
|
|
*
|
|
* \param[in] acc_ramp Pointer to acc_ramp structure to be initialized.
|
|
* \param[in] bts BTS which uses this ACC ramp data structure.
|
|
*/
|
|
void acc_ramp_init(struct acc_ramp *acc_ramp, struct gsm_bts *bts)
|
|
{
|
|
acc_ramp->bts = bts;
|
|
acc_ramp_set_enabled(acc_ramp, false);
|
|
acc_ramp->step_size = ACC_RAMP_STEP_SIZE_DEFAULT;
|
|
acc_ramp->step_interval_sec = ACC_RAMP_STEP_INTERVAL_MIN;
|
|
acc_ramp->chan_load_lower_threshold = ACC_RAMP_CHAN_LOAD_THRESHOLD_LOW;
|
|
acc_ramp->chan_load_upper_threshold = ACC_RAMP_CHAN_LOAD_THRESHOLD_UP;
|
|
osmo_timer_setup(&acc_ramp->step_timer, do_acc_ramping_step, acc_ramp);
|
|
osmo_signal_register_handler(SS_NM, acc_ramp_nm_sig_cb, acc_ramp);
|
|
}
|
|
|
|
/*!
|
|
* Change the ramping step size which controls how many ACCs will be allowed per ramping step.
|
|
* Returns negative on error (step_size out of range), else zero.
|
|
* \param[in] acc_ramp Pointer to acc_ramp structure.
|
|
* \param[in] step_size The new step size value.
|
|
*/
|
|
int acc_ramp_set_step_size(struct acc_ramp *acc_ramp, unsigned int 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;
|
|
LOG_BTS(acc_ramp->bts, DRSL, LOGL_DEBUG, "ACC RAMP: ramping step size set to %u\n", step_size);
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* Change the ramping step interval to a fixed value. Unless this function is called,
|
|
* the interval is automatically scaled to the BTS channel load average.
|
|
* \param[in] acc_ramp Pointer to acc_ramp structure.
|
|
* \param[in] step_interval The new fixed step interval in seconds.
|
|
*/
|
|
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;
|
|
LOG_BTS(acc_ramp->bts, DRSL, LOGL_DEBUG, "ACC RAMP: ramping step interval set to %u seconds\n",
|
|
step_interval);
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* Change the ramping channel load thresholds. They control how ramping subset
|
|
* size of allowed ACCs changes in relation to current channel load (%, 0-100):
|
|
* Under the lower threshold, subset size may be increased; above the upper
|
|
* threshold, subset size may be decreased.
|
|
* \param[in] acc_ramp Pointer to acc_ramp structure.
|
|
* \param[in] low_threshold The new minimum threshold: values under it allow for increasing the ramping subset size.
|
|
* \param[in] up_threshold The new maximum threshold: values under it allow for increasing the ramping subset size.
|
|
*/
|
|
int acc_ramp_set_chan_load_thresholds(struct acc_ramp *acc_ramp, unsigned int low_threshold, unsigned int up_threshold)
|
|
{
|
|
/* for instance, high=49 and lower=50 makes sense:
|
|
[50-100] -> decrease, [0-49] -> increase */
|
|
if ((int)up_threshold - (int)low_threshold < -1)
|
|
return -ERANGE;
|
|
|
|
acc_ramp->chan_load_lower_threshold = low_threshold;
|
|
acc_ramp->chan_load_upper_threshold = up_threshold;
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* Determine if ACC ramping should be started according to configuration, and
|
|
* begin the ramping process if the necessary conditions are present.
|
|
* Perform at least one ramping step to allow 'step_size' ACCs.
|
|
* If 'step_size' is ACC_RAMP_STEP_SIZE_MAX, or if ACC ramping is disabled,
|
|
* all ACCs will be allowed immediately.
|
|
* \param[in] acc_ramp Pointer to acc_ramp structure.
|
|
*/
|
|
void acc_ramp_trigger(struct acc_ramp *acc_ramp)
|
|
{
|
|
if (acc_ramp_is_enabled(acc_ramp)) {
|
|
if (osmo_timer_pending(&acc_ramp->step_timer))
|
|
return; /* Already started, nothing to do */
|
|
|
|
/* Set all available ACCs to barred and start ramping up. */
|
|
acc_mgr_set_len_allowed_ramp(&acc_ramp->bts->acc_mgr, 0);
|
|
if (acc_ramp->chan_load_lower_threshold == 0 &&
|
|
acc_ramp->chan_load_upper_threshold == 100) {
|
|
LOG_BTS(acc_ramp->bts, DRSL, LOGL_ERROR,
|
|
"ACC RAMP: starting ramp up with 0 ACCs and "
|
|
"no possibility to grow the allowed subset size! "
|
|
"Check VTY cmd access-control-class-ramping-chan-load\n");
|
|
}
|
|
do_acc_ramping_step(acc_ramp);
|
|
} else {
|
|
/* Abort any previously running ramping process and allow all available ACCs. */
|
|
acc_ramp_abort(acc_ramp);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* Abort the ramping process and allow all available ACCs immediately.
|
|
* \param[in] acc_ramp Pointer to acc_ramp structure.
|
|
*/
|
|
void acc_ramp_abort(struct acc_ramp *acc_ramp)
|
|
{
|
|
if (osmo_timer_pending(&acc_ramp->step_timer))
|
|
osmo_timer_del(&acc_ramp->step_timer);
|
|
|
|
acc_mgr_set_len_allowed_ramp(&acc_ramp->bts->acc_mgr, 10);
|
|
}
|