diff options
Diffstat (limited to 'src/host/trxcon/sched_lchan_xcch.c')
-rw-r--r-- | src/host/trxcon/sched_lchan_xcch.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/src/host/trxcon/sched_lchan_xcch.c b/src/host/trxcon/sched_lchan_xcch.c deleted file mode 100644 index 196f949c..00000000 --- a/src/host/trxcon/sched_lchan_xcch.c +++ /dev/null @@ -1,213 +0,0 @@ -/* - * OsmocomBB <-> SDR connection bridge - * TDMA scheduler: handlers for DL / UL bursts on logical channels - * - * (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 <stdint.h> - -#include <osmocom/core/logging.h> -#include <osmocom/core/bits.h> - -#include <osmocom/gsm/gsm_utils.h> -#include <osmocom/gsm/protocol/gsm_04_08.h> -#include <osmocom/coding/gsm0503_coding.h> - -#include "l1ctl_proto.h" -#include "scheduler.h" -#include "sched_trx.h" -#include "logging.h" -#include "trx_if.h" -#include "l1ctl.h" - -int rx_data_fn(struct trx_instance *trx, struct trx_ts *ts, - struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid, - sbit_t *bits, int8_t rssi, int16_t toa256) -{ - const struct trx_lchan_desc *lchan_desc; - uint8_t l2[GSM_MACBLOCK_LEN], *mask; - int n_errors, n_bits_total, rc; - sbit_t *buffer, *offset; - uint32_t *first_fn; - - /* Set up pointers */ - lchan_desc = &trx_lchan_desc[lchan->type]; - first_fn = &lchan->rx_first_fn; - mask = &lchan->rx_burst_mask; - buffer = lchan->rx_bursts; - - LOGP(DSCHD, LOGL_DEBUG, "Data received on %s: fn=%u ts=%u bid=%u\n", - lchan_desc->name, fn, ts->index, bid); - - /* Reset internal state */ - if (bid == 0) { - /* Clean up old measurements */ - memset(&lchan->meas, 0x00, sizeof(lchan->meas)); - - *first_fn = fn; - *mask = 0x0; - } - - /* Update mask */ - *mask |= (1 << bid); - - /* Update measurements */ - lchan->meas.rssi_sum += rssi; - lchan->meas.toa256_sum += toa256; - lchan->meas.num++; - - /* Copy burst to buffer of 4 bursts */ - offset = buffer + bid * 116; - memcpy(offset, bits + 3, 58); - memcpy(offset + 58, bits + 87, 58); - - /* Wait until complete set of bursts */ - if (bid != 3) - return 0; - - /* Check for complete set of bursts */ - if ((*mask & 0xf) != 0xf) { - LOGP(DSCHD, LOGL_ERROR, "Received incomplete data frame at " - "fn=%u (%u/%u) for %s\n", *first_fn, - (*first_fn) % ts->mf_layout->period, - ts->mf_layout->period, - lchan_desc->name); - /* NOTE: xCCH has an insane amount of redundancy for error - * correction, so even just 2 valid bursts might be enough - * to reconstruct some L2 frames. This is why we do not - * abort here. */ - } - - /* Attempt to decode */ - rc = gsm0503_xcch_decode(l2, buffer, &n_errors, &n_bits_total); - if (rc) { - LOGP(DSCHD, LOGL_ERROR, "Received bad data frame at fn=%u " - "(%u/%u) for %s\n", *first_fn, - (*first_fn) % ts->mf_layout->period, - ts->mf_layout->period, - lchan_desc->name); - - /** - * We should anyway send dummy frame for - * proper measurement reporting... - */ - return sched_send_dt_ind(trx, ts, lchan, NULL, 0, - n_errors, true, false); - } - - /* Send a L2 frame to the higher layers */ - return sched_send_dt_ind(trx, ts, lchan, l2, GSM_MACBLOCK_LEN, - n_errors, false, false); -} - -int tx_data_fn(struct trx_instance *trx, struct trx_ts *ts, - struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid) -{ - const struct trx_lchan_desc *lchan_desc; - ubit_t burst[GSM_BURST_LEN]; - ubit_t *buffer, *offset; - const uint8_t *tsc; - uint8_t *mask; - int rc; - - /* Set up pointers */ - lchan_desc = &trx_lchan_desc[lchan->type]; - mask = &lchan->tx_burst_mask; - buffer = lchan->tx_bursts; - - if (bid > 0) { - /* If we have encoded bursts */ - if (*mask) - goto send_burst; - else - return 0; - } - - /* Check the prim payload length */ - if (lchan->prim->payload_len != GSM_MACBLOCK_LEN) { - LOGP(DSCHD, LOGL_ERROR, "Primitive has odd length %zu (expected %u), " - "so dropping...\n", lchan->prim->payload_len, GSM_MACBLOCK_LEN); - - sched_prim_drop(lchan); - return -EINVAL; - } - - /* Encode payload */ - rc = gsm0503_xcch_encode(buffer, lchan->prim->payload); - if (rc) { - LOGP(DSCHD, LOGL_ERROR, "Failed to encode L2 payload (len=%zu): %s\n", - lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload, - lchan->prim->payload_len)); - - /* Forget this primitive */ - sched_prim_drop(lchan); - - return -EINVAL; - } - -send_burst: - /* Determine which burst should be sent */ - offset = buffer + bid * 116; - - /* Update mask */ - *mask |= (1 << bid); - - /* Choose proper TSC */ - tsc = sched_nb_training_bits[trx->tsc]; - - /* Compose a new burst */ - memset(burst, 0, 3); /* TB */ - memcpy(burst + 3, offset, 58); /* Payload 1/2 */ - memcpy(burst + 61, tsc, 26); /* TSC */ - memcpy(burst + 87, offset + 58, 58); /* Payload 2/2 */ - memset(burst + 145, 0, 3); /* TB */ - - LOGP(DSCHD, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u burst=%u\n", - lchan_desc->name, fn, ts->index, bid); - - /* Forward burst to scheduler */ - rc = sched_trx_handle_tx_burst(trx, ts, lchan, fn, burst); - if (rc) { - /* Forget this primitive */ - sched_prim_drop(lchan); - - /* Reset mask */ - *mask = 0x00; - - return rc; - } - - /* If we have sent the last (4/4) burst */ - if ((*mask & 0x0f) == 0x0f) { - /* Forget processed primitive */ - sched_prim_drop(lchan); - - /* Reset mask */ - *mask = 0x00; - - /* Confirm data sending */ - sched_send_dt_conf(trx, ts, lchan, fn, false); - } - - return 0; -} |