trxcon/scheduler: add PDTCH channel support
Change-Id: I1176576f54c1d68e79cc6ac37d61a9033f7018dd
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1a892eeb2a
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0a1da46869
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@ -32,6 +32,7 @@ trxcon_SOURCES = \
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# Scheduler
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trxcon_SOURCES += \
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sched_lchan_common.c \
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sched_lchan_pdtch.c \
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sched_lchan_desc.c \
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sched_lchan_xcch.c \
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sched_lchan_tchf.c \
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@ -25,10 +25,6 @@
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#include "sched_trx.h"
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/* TODO: implement */
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#define tx_pdtch_fn NULL
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#define rx_pdtch_fn NULL
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/* Forward declaration of handlers */
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int rx_data_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
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@ -58,6 +54,12 @@ int rx_tchh_fn(struct trx_instance *trx, struct trx_ts *ts,
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int tx_tchh_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
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int rx_pdtch_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
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sbit_t *bits, int8_t rssi, int16_t toa256);
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int tx_pdtch_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
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const struct trx_lchan_desc trx_lchan_desc[_TRX_CHAN_MAX] = {
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{
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@ -0,0 +1,204 @@
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/*
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* OsmocomBB <-> SDR connection bridge
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* TDMA scheduler: handlers for DL / UL bursts on logical channels
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*
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* (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <errno.h>
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#include <string.h>
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#include <stdint.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/coding/gsm0503_coding.h>
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#include "l1ctl_proto.h"
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#include "scheduler.h"
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#include "sched_trx.h"
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#include "logging.h"
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#include "trx_if.h"
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#include "trxcon.h"
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#include "l1ctl.h"
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int rx_pdtch_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
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sbit_t *bits, int8_t rssi, int16_t toa256)
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{
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const struct trx_lchan_desc *lchan_desc;
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uint8_t l2[GPRS_L2_MAX_LEN], *mask;
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int n_errors, n_bits_total, rc;
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sbit_t *buffer, *offset;
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uint32_t *first_fn;
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size_t l2_len;
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/* Set up pointers */
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lchan_desc = &trx_lchan_desc[lchan->type];
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first_fn = &lchan->rx_first_fn;
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mask = &lchan->rx_burst_mask;
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buffer = lchan->rx_bursts;
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LOGP(DSCHD, LOGL_DEBUG, "Packet data received on %s: "
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"fn=%u ts=%u bid=%u\n", lchan_desc->name, fn, ts->index, bid);
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/* Reset internal state */
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if (bid == 0) {
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/* Clean up old measurements */
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memset(&lchan->meas, 0x00, sizeof(lchan->meas));
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*first_fn = fn;
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*mask = 0x0;
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}
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/* Update mask */
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*mask |= (1 << bid);
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/* Update measurements */
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lchan->meas.toa256_sum += toa256;
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lchan->meas.rssi_sum += rssi;
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lchan->meas.toa256_num++;
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lchan->meas.rssi_num++;
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/* Copy burst to buffer of 4 bursts */
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offset = buffer + bid * 116;
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memcpy(offset, bits + 3, 58);
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memcpy(offset + 58, bits + 87, 58);
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/* Wait until complete set of bursts */
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if (bid != 3)
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return 0;
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/* Check for complete set of bursts */
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if ((*mask & 0xf) != 0xf) {
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LOGP(DSCHD, LOGL_ERROR, "Received incomplete data frame at "
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"fn=%u (%u/%u) for %s\n", *first_fn,
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(*first_fn) % ts->mf_layout->period,
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ts->mf_layout->period,
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lchan_desc->name);
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return -1;
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}
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/* Attempt to decode */
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rc = gsm0503_pdtch_decode(l2, buffer,
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NULL, &n_errors, &n_bits_total);
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if (rc < 0) {
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LOGP(DSCHD, LOGL_ERROR, "Received bad packet data frame "
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"at fn=%u (%u/%u) for %s\n", *first_fn,
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(*first_fn) % ts->mf_layout->period,
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ts->mf_layout->period,
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lchan_desc->name);
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}
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/* Determine L2 length */
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l2_len = rc > 0 ? rc : 0;
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/* Send a L2 frame to the higher layers */
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sched_send_dt_ind(trx, ts, lchan,
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l2, l2_len, n_errors, rc < 0, true);
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return 0;
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}
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int tx_pdtch_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid)
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{
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const struct trx_lchan_desc *lchan_desc;
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ubit_t burst[GSM_BURST_LEN];
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ubit_t *buffer, *offset;
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const uint8_t *tsc;
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uint8_t *mask;
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int rc;
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/* Set up pointers */
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lchan_desc = &trx_lchan_desc[lchan->type];
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mask = &lchan->tx_burst_mask;
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buffer = lchan->tx_bursts;
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if (bid > 0) {
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/* If we have encoded bursts */
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if (*mask)
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goto send_burst;
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else
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return 0;
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}
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/* Encode payload */
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rc = gsm0503_pdtch_encode(buffer, lchan->prim->payload,
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lchan->prim->payload_len);
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if (rc) {
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LOGP(DSCHD, LOGL_ERROR, "Failed to encode L2 payload\n");
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/* Forget this primitive */
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sched_prim_drop(lchan);
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return -EINVAL;
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}
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send_burst:
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/* Determine which burst should be sent */
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offset = buffer + bid * 116;
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/* Update mask */
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*mask |= (1 << bid);
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/* Choose proper TSC */
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tsc = sched_nb_training_bits[trx->tsc];
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/* Compose a new burst */
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memset(burst, 0, 3); /* TB */
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memcpy(burst + 3, offset, 58); /* Payload 1/2 */
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memcpy(burst + 61, tsc, 26); /* TSC */
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memcpy(burst + 87, offset + 58, 58); /* Payload 2/2 */
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memset(burst + 145, 0, 3); /* TB */
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LOGP(DSCHD, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u burst=%u\n",
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lchan_desc->name, fn, ts->index, bid);
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/* Forward burst to scheduler */
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rc = sched_trx_handle_tx_burst(trx, ts, lchan, fn, burst);
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if (rc) {
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/* Forget this primitive */
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sched_prim_drop(lchan);
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/* Reset mask */
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*mask = 0x00;
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return rc;
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}
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/* If we have sent the last (4/4) burst */
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if ((*mask & 0x0f) == 0x0f) {
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/* Confirm data / traffic sending */
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sched_send_dt_conf(trx, ts, lchan, fn, true);
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/* Forget processed primitive */
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sched_prim_drop(lchan);
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/* Reset mask */
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*mask = 0x00;
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}
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return 0;
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}
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@ -17,6 +17,9 @@
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#define GPRS_BURST_LEN GSM_BURST_LEN
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#define EDGE_BURST_LEN 444
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#define GPRS_L2_MAX_LEN 54
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#define EDGE_L2_MAX_LEN 155
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#define TRX_CH_LID_DEDIC 0x00
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#define TRX_CH_LID_SACCH 0x40
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