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/*
* OsmocomBB <-> SDR connection bridge
* TDMA scheduler: common routines for lchan handlers
*
* (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <errno.h>
#include <string.h>
#include <talloc.h>
#include <stdint.h>
#include <stdbool.h>
#include <arpa/inet.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/bits.h>
#include <osmocom/codec/codec.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/protocol/gsm_08_58.h>
#include "l1ctl_proto.h"
#include "scheduler.h"
#include "sched_trx.h"
#include "logging.h"
#include "trx_if.h"
#include "trxcon.h"
#include "l1ctl.h"
/* GSM 05.02 Chapter 5.2.3 Normal Burst (NB) */
const uint8_t sched_nb_training_bits[8][26] = {
{
0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0,
0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1,
},
{
0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1,
1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1,
},
{
0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1,
0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0,
},
{
0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0,
1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
},
{
0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0,
1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1,
},
{
0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0,
0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0,
},
{
1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1,
0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
},
{
1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0,
0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0,
},
};
int sched_send_data_ind(struct trx_instance *trx, struct trx_ts *ts,
struct trx_lchan_state *lchan, uint8_t *l2, size_t l2_len,
bool dec_failed, int bit_error_count)
{
const struct trx_lchan_desc *lchan_desc;
struct l1ctl_info_dl *data;
/* Allocate memory */
data = talloc_zero_size(ts, sizeof(struct l1ctl_info_dl) + l2_len);
if (data == NULL)
return -ENOMEM;
/* Set up pointers */
lchan_desc = &trx_lchan_desc[lchan->type];
/* Fill in known downlink info */
data->chan_nr = lchan_desc->chan_nr | ts->index;
data->link_id = lchan_desc->link_id;
data->band_arfcn = htons(trx->band_arfcn);
data->frame_nr = htonl(lchan->rx_first_fn);
data->rx_level = -(lchan->meas.rssi_sum / lchan->meas.rssi_num);
data->num_biterr = bit_error_count;
/* FIXME: set proper values */
data->snr = 0;
if (dec_failed) {
/* Mark frame as broken */
data->fire_crc = 2;
} else {
/* Fill in the payload */
memcpy(data->payload, l2, l2_len);
}
/* Put a packet to higher layers */
l1ctl_tx_data_ind(trx->l1l, data, l2_len == GSM_MACBLOCK_LEN ?
L1CTL_DATA_IND : L1CTL_TRAFFIC_IND);
talloc_free(data);
return 0;
}
int sched_send_data_conf(struct trx_instance *trx, struct trx_ts *ts,
struct trx_lchan_state *lchan, uint32_t fn, size_t l2_len)
{
const struct trx_lchan_desc *lchan_desc;
struct l1ctl_info_dl *data;
/* Allocate memory */
data = talloc_zero(ts, struct l1ctl_info_dl);
if (data == NULL)
return -ENOMEM;
/* Set up pointers */
lchan_desc = &trx_lchan_desc[lchan->type];
/* Fill in known downlink info */
data->chan_nr = lchan_desc->chan_nr | ts->index;
data->link_id = lchan_desc->link_id;
data->band_arfcn = htons(trx->band_arfcn);
data->frame_nr = htonl(fn);
l1ctl_tx_dt_conf(trx->l1l, data,
l2_len != GSM_MACBLOCK_LEN);
talloc_free(data);
return 0;
}
/**
* Composes a bad frame indication message
* according to the current tch_mode.
*
* @param l2 Pointer to allocated byte array
* @param tch_mode Current TCH mode
* @return How much bytes were written
*/
size_t sched_bad_frame_ind(uint8_t *l2, uint8_t rsl_cmode, uint8_t tch_mode)
{
/* BFI is only required for speech */
if (rsl_cmode != RSL_CMOD_SPD_SPEECH)
return 0;
switch (tch_mode) {
case GSM48_CMODE_SIGN:
case GSM48_CMODE_SPEECH_V1: /* Full Rate */
memset(l2, 0x00, GSM_FR_BYTES);
l2[0] = 0xd0;
return GSM_FR_BYTES;
case GSM48_CMODE_SPEECH_EFR: /* Enhanced Full Rate */
memset(l2, 0x00, GSM_EFR_BYTES);
l2[0] = 0xc0;
return GSM_EFR_BYTES;
case GSM48_CMODE_SPEECH_AMR: /* Adaptive Multi Rate */
/* FIXME: AMR is not implemented yet */
return 0;
default:
LOGP(DSCH, LOGL_ERROR, "Invalid TCH mode: %u\n", tch_mode);
return 0;
}
}
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