97 lines
3.7 KiB
C
97 lines
3.7 KiB
C
#pragma once
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#include <stdint.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/gsm/gsm_utils.h>
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struct gsm_lchan;
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struct gsm_bts;
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struct gsm_subscriber_connection;
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struct gsm_meas_rep mr;
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#define LOGPHOLCHANTOLCHAN(old_lchan, new_lchan, level, fmt, args...) \
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LOGP(DHODEC, level, "(BTS %u trx %u arfcn %u ts %u lchan %u %s %s)->(BTS %u trx %u arfcn %u ts %u lchan %u %s) (subscr %s) " fmt, \
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old_lchan->ts->trx->bts->nr, \
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old_lchan->ts->trx->nr, \
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old_lchan->ts->trx->arfcn, \
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old_lchan->ts->nr, \
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old_lchan->nr, \
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gsm_lchant_name(old_lchan->type), \
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gsm48_chan_mode_name(old_lchan->tch_mode), \
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new_lchan->ts->trx->bts->nr, \
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new_lchan->ts->trx->nr, \
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new_lchan->ts->trx->arfcn, \
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new_lchan->ts->nr, \
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new_lchan->nr, \
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gsm_pchan_name(new_lchan->ts->pchan), \
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bsc_subscr_name(old_lchan->conn? old_lchan->conn->bsub : NULL), \
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## args)
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#define LOGPHO(struct_bsc_handover, level, fmt, args ...) \
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LOGPHOLCHANTOLCHAN(struct_bsc_handover->old_lchan, struct_bsc_handover->new_lchan, level, fmt, ## args)
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enum hodec_id {
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HODEC_NONE,
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HODEC1 = 1,
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HODEC2 = 2,
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};
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struct bsc_handover {
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struct llist_head list;
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/* Initial details of what is requested */
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struct gsm_lchan *old_lchan;
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struct gsm_bts *new_bts;
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enum gsm_chan_t new_lchan_type;
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bool async;
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/* Derived and resulting state */
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bool inter_cell;
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uint8_t ho_ref;
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enum hodec_id from_hodec_id;
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struct gsm_lchan *new_lchan;
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struct osmo_timer_list T3103;
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};
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int bsc_handover_start(enum hodec_id from_hodec_id, struct gsm_lchan *old_lchan, struct gsm_bts *new_bts,
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enum gsm_chan_t new_lchan_type);
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int bsc_handover_start_gscon(struct gsm_subscriber_connection *conn);
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void bsc_clear_handover(struct gsm_subscriber_connection *conn, int free_lchan);
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struct gsm_lchan *bsc_handover_pending(struct gsm_lchan *new_lchan);
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int bsc_ho_count(struct gsm_bts *bts, bool inter_cell);
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/* Handover decision algorithms' actions to take on incoming handover-relevant events.
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*
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* All events that are interesting for handover decision are actually communicated by S_LCHAN_* signals,
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* so theoretically, each handover algorithm could evaluate those. However, handover_logic.c cleans up
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* handover operation state upon receiving some of these signals. To allow a handover decision algorithm
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* to take advantage of e.g. the struct bsc_handover before it is discarded, the handover decision event
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* handler needs to be invoked before handover_logic.c discards the state. For example, if the handover
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* decision wants to place a penalty timer upon a handover failure, it still needs to know which target
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* cell the handover failed for; handover_logic.c erases that knowledge on handover failure, since it
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* needs to clean up the lchan's handover state.
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*
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* The most explicit and safest way to ensure the correct order of event handling is to invoke the
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* handover decision algorithm's actions from handover_logic.c itself, before cleaning up. This struct
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* provides the callback functions for this purpose.
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*
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* For consistency, also handle signals in this way that aren't actually in danger of interference from
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* handover_logic.c (which also saves repeated lookup of handover state for lchans). Thus, handover
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* decision algorithms should not register any signal handler at all.
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*/
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struct handover_decision_callbacks {
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struct llist_head entry;
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int hodec_id;
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void (*on_measurement_report)(struct gsm_meas_rep *mr);
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void (*on_ho_chan_activ_nack)(struct bsc_handover *ho);
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void (*on_ho_failure)(struct bsc_handover *ho);
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};
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void handover_decision_callbacks_register(struct handover_decision_callbacks *hdc);
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struct handover_decision_callbacks *handover_decision_callbacks_get(int hodec_id);
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