264 lines
7.0 KiB
C
264 lines
7.0 KiB
C
/*
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* OsmocomBB <-> SDR connection bridge
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*
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* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
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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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*/
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#include <stdint.h>
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#include <errno.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/core/gsmtap_util.h>
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#include <osmocom/core/gsmtap.h>
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#include <osmocom/bb/trxcon/trxcon.h>
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#include <osmocom/bb/trxcon/trxcon_fsm.h>
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#include <osmocom/bb/trxcon/phyif.h>
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#include <osmocom/bb/l1sched/l1sched.h>
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static void trxcon_gsmtap_send(struct gsmtap_inst *gi, uint8_t chan_type,
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uint32_t fn, uint8_t tn, uint8_t ss,
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uint16_t band_arfcn,
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int8_t signal_dbm, uint8_t snr,
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const uint8_t *data, size_t data_len)
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{
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/* Omit frames with unknown channel type */
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if (chan_type == GSMTAP_CHANNEL_UNKNOWN)
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return;
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/* TODO: distinguish GSMTAP_CHANNEL_PCH and GSMTAP_CHANNEL_AGCH */
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gsmtap_send(gi, band_arfcn, tn, chan_type, ss, fn, signal_dbm, snr, data, data_len);
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}
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/* External L1 API for the scheduler */
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int l1sched_handle_config_req(struct l1sched_state *sched,
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const struct l1sched_config_req *cr)
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{
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struct trxcon_inst *trxcon = sched->priv;
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switch (cr->type) {
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case L1SCHED_CFG_PCHAN_COMB:
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{
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struct trxcon_param_set_phy_config_req req = {
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.type = TRXCON_PHY_CFGT_PCHAN_COMB,
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.pchan_comb = {
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.tn = cr->pchan_comb.tn,
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.pchan = cr->pchan_comb.pchan,
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},
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};
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return osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_SET_PHY_CONFIG_REQ, &req);
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}
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default:
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LOGPFSML(trxcon->fi, LOGL_ERROR,
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"Unhandled config request (type 0x%02x)\n", cr->type);
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return -ENODEV;
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}
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}
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int l1sched_handle_burst_req(struct l1sched_state *sched,
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const struct l1sched_burst_req *br)
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{
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struct trxcon_inst *trxcon = sched->priv;
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const struct phyif_burst_req phybr = {
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.fn = br->fn,
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.tn = br->tn,
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.pwr = br->pwr,
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.burst = &br->burst[0],
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.burst_len = br->burst_len,
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};
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return phyif_handle_burst_req(trxcon->phyif, &phybr);
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}
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/* External L2 API for the scheduler */
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int l1sched_handle_data_ind(struct l1sched_lchan_state *lchan,
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const uint8_t *data, size_t data_len,
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int n_errors, int n_bits_total,
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enum l1sched_data_type dt)
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{
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const struct l1sched_meas_set *meas = &lchan->meas_avg;
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const struct l1sched_lchan_desc *lchan_desc;
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struct l1sched_state *sched = lchan->ts->sched;
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struct trxcon_inst *trxcon = sched->priv;
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int rc;
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lchan_desc = &l1sched_lchan_desc[lchan->type];
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struct trxcon_param_rx_data_ind ind = {
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/* .traffic is set below */
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.chan_nr = lchan_desc->chan_nr | lchan->ts->index,
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.link_id = lchan_desc->link_id,
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.band_arfcn = trxcon->l1p.band_arfcn,
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.frame_nr = meas->fn,
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.toa256 = meas->toa256,
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.rssi = meas->rssi,
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.n_errors = n_errors,
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.n_bits_total = n_bits_total,
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.data_len = data_len,
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.data = data,
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};
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switch (dt) {
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case L1SCHED_DT_PACKET_DATA:
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case L1SCHED_DT_TRAFFIC:
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ind.traffic = true;
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/* fall-through */
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case L1SCHED_DT_SIGNALING:
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rc = osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_RX_DATA_IND, &ind);
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break;
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case L1SCHED_DT_OTHER:
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if (lchan->type == L1SCHED_SCH) {
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if (trxcon->fi->state != TRXCON_ST_FBSB_SEARCH)
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return 0;
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rc = osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_FBSB_SEARCH_RES, NULL);
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break;
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}
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/* fall through */
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default:
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LOGPFSML(trxcon->fi, LOGL_ERROR,
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"Unhandled L2 DATA.ind (type 0x%02x)\n", dt);
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return -ENODEV;
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}
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if (trxcon->gsmtap != NULL && data != NULL && data_len > 0) {
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trxcon_gsmtap_send(trxcon->gsmtap, lchan_desc->gsmtap_chan_type,
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meas->fn, lchan->ts->index, lchan_desc->ss_nr,
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trxcon->l1p.band_arfcn, meas->rssi, 0,
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data, data_len);
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}
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return rc;
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}
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int l1sched_handle_data_cnf(struct l1sched_lchan_state *lchan,
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uint32_t fn, enum l1sched_data_type dt)
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{
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const struct l1sched_lchan_desc *lchan_desc;
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struct l1sched_state *sched = lchan->ts->sched;
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struct trxcon_inst *trxcon = sched->priv;
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bool is_traffic = false;
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const uint8_t *data;
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uint8_t ra_buf[2];
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size_t data_len;
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int rc;
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lchan_desc = &l1sched_lchan_desc[lchan->type];
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switch (dt) {
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case L1SCHED_DT_TRAFFIC:
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case L1SCHED_DT_PACKET_DATA:
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is_traffic = true;
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/* fall-through */
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case L1SCHED_DT_SIGNALING:
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{
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struct trxcon_param_tx_data_cnf cnf = {
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.traffic = is_traffic,
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.chan_nr = lchan_desc->chan_nr | lchan->ts->index,
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.link_id = lchan_desc->link_id,
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.band_arfcn = trxcon->l1p.band_arfcn,
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.frame_nr = fn,
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};
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rc = osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_TX_DATA_CNF, &cnf);
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data_len = lchan->prim->payload_len;
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data = lchan->prim->payload;
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break;
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}
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case L1SCHED_DT_OTHER:
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if (L1SCHED_PRIM_IS_RACH(lchan->prim)) {
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const struct l1sched_ts_prim_rach *rach;
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struct trxcon_param_tx_access_burst_cnf cnf = {
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.band_arfcn = trxcon->l1p.band_arfcn,
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.frame_nr = fn,
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};
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rc = osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_TX_ACCESS_BURST_CNF, &cnf);
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rach = (struct l1sched_ts_prim_rach *)lchan->prim->payload;
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if (lchan->prim->type == L1SCHED_PRIM_RACH11) {
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ra_buf[0] = (uint8_t)(rach->ra >> 3);
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ra_buf[1] = (uint8_t)(rach->ra & 0x07);
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data = &ra_buf[0];
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data_len = 2;
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} else {
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ra_buf[0] = (uint8_t)(rach->ra);
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data = &ra_buf[0];
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data_len = 1;
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}
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break;
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}
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/* fall through */
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default:
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LOGPFSML(trxcon->fi, LOGL_ERROR,
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"Unhandled L2 DATA.cnf (type 0x%02x)\n", dt);
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return -ENODEV;
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}
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if (trxcon->gsmtap != NULL) {
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trxcon_gsmtap_send(trxcon->gsmtap, lchan_desc->gsmtap_chan_type,
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fn, lchan->ts->index, lchan_desc->ss_nr,
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trxcon->l1p.band_arfcn | ARFCN_UPLINK,
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0, 0, data, data_len);
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}
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return rc;
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}
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/* External L1 API for the PHYIF */
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int phyif_handle_burst_ind(void *priv, const struct phyif_burst_ind *bi)
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{
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struct trxcon_inst *trxcon = priv;
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const struct l1sched_meas_set meas = {
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.fn = bi->fn,
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.toa256 = bi->toa256,
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.rssi = bi->rssi,
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};
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/* Poke scheduler */
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l1sched_handle_rx_burst(trxcon->sched, bi->tn, bi->fn,
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bi->burst, bi->burst_len, &meas);
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/* Correct local clock counter */
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if (bi->fn % 51 == 0)
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l1sched_clck_handle(trxcon->sched, bi->fn);
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return 0;
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}
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int phyif_handle_rsp(void *priv, const struct phyif_rsp *rsp)
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{
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struct trxcon_inst *trxcon = priv;
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switch (rsp->type) {
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case PHYIF_CMDT_MEASURE:
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{
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const struct phyif_rspp_measure *meas = &rsp->param.measure;
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struct trxcon_param_full_power_scan_res res = {
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.band_arfcn = meas->band_arfcn,
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.dbm = meas->dbm,
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};
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return osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_FULL_POWER_SCAN_RES, &res);
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}
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default:
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LOGPFSML(trxcon->fi, LOGL_ERROR,
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"Unhandled PHYIF response (type 0x%02x)\n", rsp->type);
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return -ENODEV;
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}
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}
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