322 lines
9.2 KiB
C
322 lines
9.2 KiB
C
/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
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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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <netinet/in.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/statistics.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/gsm/abis_nm.h>
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#include <osmocom/codec/ecu.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/bts.h>
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#include <osmo-bts/bts_trx.h>
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#include <osmo-bts/logging.h>
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struct osmo_tdef_group bts_tdef_groups[] = {
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{ .name = "bts", .tdefs = bts_T_defs, .desc = "BTS process timers" },
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{ .name = "abis", .tdefs = abis_T_defs, .desc = "Abis (RSL) related timers" },
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{}
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};
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const struct value_string gsm_pchant_names[13] = {
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{ GSM_PCHAN_NONE, "NONE" },
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{ GSM_PCHAN_CCCH, "CCCH" },
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{ GSM_PCHAN_CCCH_SDCCH4,"CCCH+SDCCH4" },
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{ GSM_PCHAN_TCH_F, "TCH/F" },
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{ GSM_PCHAN_TCH_H, "TCH/H" },
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{ GSM_PCHAN_SDCCH8_SACCH8C, "SDCCH8" },
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{ GSM_PCHAN_PDCH, "PDCH" },
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{ GSM_PCHAN_TCH_F_PDCH, "TCH/F_PDCH" },
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{ GSM_PCHAN_UNKNOWN, "UNKNOWN" },
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{ GSM_PCHAN_CCCH_SDCCH4_CBCH, "CCCH+SDCCH4+CBCH" },
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{ GSM_PCHAN_SDCCH8_SACCH8C_CBCH, "SDCCH8+CBCH" },
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{ GSM_PCHAN_OSMO_DYN, "TCH/F_TCH/H_SDCCH8_PDCH" },
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{ 0, NULL }
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};
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const struct value_string gsm_pchant_descs[13] = {
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{ GSM_PCHAN_NONE, "Physical Channel not configured" },
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{ GSM_PCHAN_CCCH, "FCCH + SCH + BCCH + CCCH (Comb. IV)" },
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{ GSM_PCHAN_CCCH_SDCCH4,
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"FCCH + SCH + BCCH + CCCH + 4 SDCCH + 2 SACCH (Comb. V)" },
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{ GSM_PCHAN_TCH_F, "TCH/F + FACCH/F + SACCH (Comb. I)" },
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{ GSM_PCHAN_TCH_H, "2 TCH/H + 2 FACCH/H + 2 SACCH (Comb. II)" },
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{ GSM_PCHAN_SDCCH8_SACCH8C, "8 SDCCH + 4 SACCH (Comb. VII)" },
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{ GSM_PCHAN_PDCH, "Packet Data Channel for GPRS/EDGE" },
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{ GSM_PCHAN_TCH_F_PDCH, "Dynamic TCH/F or GPRS PDCH" },
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{ GSM_PCHAN_UNKNOWN, "Unknown / Unsupported channel combination" },
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{ GSM_PCHAN_CCCH_SDCCH4_CBCH, "FCCH + SCH + BCCH + CCCH + CBCH + 3 SDCCH + 2 SACCH (Comb. V)" },
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{ GSM_PCHAN_SDCCH8_SACCH8C_CBCH, "7 SDCCH + 4 SACCH + CBCH (Comb. VII)" },
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{ GSM_PCHAN_OSMO_DYN, "Dynamic TCH/F or TCH/H or SDCCH/8 or GPRS PDCH" },
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{ 0, NULL }
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};
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const char *gsm_pchan_name(enum gsm_phys_chan_config c)
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{
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return get_value_string(gsm_pchant_names, c);
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}
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/* TODO: move to libosmocore, next to gsm_chan_t_names? */
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const char *gsm_lchant_name(enum gsm_chan_t c)
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{
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return get_value_string(gsm_chan_t_names, c);
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}
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static char ts2str[255];
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char *gsm_ts_name(const struct gsm_bts_trx_ts *ts)
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{
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ")",
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GSM_TS_NAME_ARGS(ts));
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return ts2str;
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}
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/*! Log timeslot number with full pchan information */
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char *gsm_ts_and_pchan_name(const struct gsm_bts_trx_ts *ts)
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{
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switch (ts->pchan) {
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case GSM_PCHAN_OSMO_DYN:
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if (ts->dyn.pchan_is == ts->dyn.pchan_want)
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s as %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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gsm_pchan_name(ts->dyn.pchan_is));
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else
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s switching %s -> %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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gsm_pchan_name(ts->dyn.pchan_is),
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gsm_pchan_name(ts->dyn.pchan_want));
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break;
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case GSM_PCHAN_TCH_F_PDCH:
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if ((ts->flags & TS_F_PDCH_PENDING_MASK) == 0)
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s as %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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(ts->flags & TS_F_PDCH_ACTIVE)? "PDCH"
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: "TCH/F");
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else
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s switching %s -> %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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(ts->flags & TS_F_PDCH_ACTIVE)? "PDCH"
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: "TCH/F",
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(ts->flags & TS_F_PDCH_ACT_PENDING)? "PDCH"
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: "TCH/F");
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break;
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default:
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snprintf(ts2str, sizeof(ts2str), "(" GSM_TS_NAME_FMT ",pchan=%s)",
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GSM_TS_NAME_ARGS(ts), gsm_pchan_name(ts->pchan));
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break;
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}
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return ts2str;
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}
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/* determine logical channel based on TRX and channel number IE */
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struct gsm_lchan *rsl_lchan_lookup(struct gsm_bts_trx *trx, uint8_t chan_nr,
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int *rc)
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{
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uint8_t ts_nr = chan_nr & 0x07;
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uint8_t cbits = chan_nr >> 3;
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uint8_t lch_idx;
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struct gsm_bts_trx_ts *ts = &trx->ts[ts_nr];
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bool ok = true;
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if (rc)
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*rc = -EINVAL;
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switch (cbits) {
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_VAMOS_Bm_ACCHs:
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if (ts->vamos.peer == NULL)
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return NULL;
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ts = ts->vamos.peer;
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/* fall-through */
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case ABIS_RSL_CHAN_NR_CBITS_Bm_ACCHs:
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lch_idx = 0; /* TCH/F */
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if (ts->pchan != GSM_PCHAN_TCH_F &&
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ts->pchan != GSM_PCHAN_PDCH &&
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ts->pchan != GSM_PCHAN_TCH_F_PDCH &&
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ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_VAMOS_Lm_ACCHs(0):
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_VAMOS_Lm_ACCHs(1):
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if (ts->vamos.peer == NULL)
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return NULL;
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ts = ts->vamos.peer;
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/* fall-through */
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case ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(0):
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case ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(1):
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lch_idx = cbits & 0x1; /* TCH/H */
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if (ts->pchan != GSM_PCHAN_TCH_H &&
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ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(0):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(1):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(2):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(3):
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lch_idx = cbits & 0x3; /* SDCCH/4 */
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if (ts->pchan != GSM_PCHAN_CCCH_SDCCH4 &&
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ts->pchan != GSM_PCHAN_CCCH_SDCCH4_CBCH)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(0):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(1):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(2):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(3):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(4):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(5):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(6):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(7):
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lch_idx = cbits & 0x7; /* SDCCH/8 */
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if (ts->pchan != GSM_PCHAN_SDCCH8_SACCH8C &&
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ts->pchan != GSM_PCHAN_SDCCH8_SACCH8C_CBCH &&
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ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_BCCH:
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case ABIS_RSL_CHAN_NR_CBITS_RACH:
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case ABIS_RSL_CHAN_NR_CBITS_PCH_AGCH:
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lch_idx = 0;
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if (ts->pchan != GSM_PCHAN_CCCH &&
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ts->pchan != GSM_PCHAN_CCCH_SDCCH4 &&
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ts->pchan != GSM_PCHAN_CCCH_SDCCH4_CBCH)
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ok = false;
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/* FIXME: we should not return first sdcch4 !!! */
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break;
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_PDCH:
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lch_idx = 0;
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if (ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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default:
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return NULL;
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}
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if (rc && ok)
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*rc = 0;
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return &ts->lchan[lch_idx];
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}
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static const uint8_t subslots_per_pchan[] = {
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[GSM_PCHAN_NONE] = 0,
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[GSM_PCHAN_CCCH] = 0,
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[GSM_PCHAN_PDCH] = 0,
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[GSM_PCHAN_CCCH_SDCCH4] = 4,
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[GSM_PCHAN_TCH_F] = 1,
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[GSM_PCHAN_TCH_H] = 2,
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[GSM_PCHAN_SDCCH8_SACCH8C] = 8,
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[GSM_PCHAN_CCCH_SDCCH4_CBCH] = 4,
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[GSM_PCHAN_SDCCH8_SACCH8C_CBCH] = 8,
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/*
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* GSM_PCHAN_TCH_F_PDCH and GSM_PCHAN_OSMO_DYN should not be
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* part of this, those TS are handled according to their dynamic state.
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*/
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};
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/*! Return the actual pchan type, also heeding dynamic TS. */
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enum gsm_phys_chan_config ts_pchan(const struct gsm_bts_trx_ts *ts)
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{
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switch (ts->pchan) {
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case GSM_PCHAN_OSMO_DYN:
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return ts->dyn.pchan_is;
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case GSM_PCHAN_TCH_F_PDCH:
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if (ts->flags & TS_F_PDCH_ACTIVE)
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return GSM_PCHAN_PDCH;
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else
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return GSM_PCHAN_TCH_F;
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default:
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return ts->pchan;
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}
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}
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/*! According to ts->pchan and possibly ts->dyn_pchan, return the number of
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* logical channels available in the timeslot. */
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uint8_t ts_subslots(const struct gsm_bts_trx_ts *ts)
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{
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return subslots_per_pchan[ts_pchan(ts)];
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}
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static bool pchan_is_tch(enum gsm_phys_chan_config pchan)
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{
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switch (pchan) {
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case GSM_PCHAN_TCH_F:
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case GSM_PCHAN_TCH_H:
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return true;
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default:
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return false;
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}
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}
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bool ts_is_tch(const struct gsm_bts_trx_ts *ts)
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{
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return pchan_is_tch(ts_pchan(ts));
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}
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bool ts_is_pdch(const struct gsm_bts_trx_ts *ts)
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{
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switch (ts->pchan) {
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case GSM_PCHAN_PDCH:
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return true;
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case GSM_PCHAN_TCH_F_PDCH:
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return (ts->flags & TS_F_PDCH_ACTIVE)
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&& !(ts->flags & TS_F_PDCH_PENDING_MASK);
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case GSM_PCHAN_OSMO_DYN:
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return ts->dyn.pchan_is == GSM_PCHAN_PDCH
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&& ts->dyn.pchan_want == ts->dyn.pchan_is;
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default:
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return false;
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}
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}
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void gsm_ts_release(struct gsm_bts_trx_ts *ts)
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{
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unsigned int ln;
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for (ln = 0; ln < ARRAY_SIZE(ts->lchan); ln++) {
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struct gsm_lchan *lchan = &ts->lchan[ln];
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gsm_lchan_release(lchan, LCHAN_REL_ACT_OML);
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}
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ts->pchan = GSM_PCHAN_NONE;
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/* Make sure pchan_is is reset, since PCU act_req to release it will be
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* ignored as the lchan will already be released. */
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ts->dyn.pchan_is = ts->dyn.pchan_want = GSM_PCHAN_NONE;
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}
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