trxcon/scheduler: add TCH/H channel support
Change-Id: Ibb2a0850692c5ff86b13b820af10b12085589e67
This commit is contained in:
parent
1bffe899d9
commit
7d06c78b37
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@ -27,10 +27,7 @@
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/* TODO: implement */
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/* TODO: implement */
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#define tx_pdtch_fn NULL
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#define tx_pdtch_fn NULL
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#define tx_tchh_fn NULL
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#define rx_pdtch_fn NULL
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#define rx_pdtch_fn NULL
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#define rx_tchh_fn NULL
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/* Forward declaration of handlers */
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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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int rx_data_fn(struct trx_instance *trx, struct trx_ts *ts,
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@ -54,6 +51,14 @@ int rx_tchf_fn(struct trx_instance *trx, struct trx_ts *ts,
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int tx_tchf_fn(struct trx_instance *trx, struct trx_ts *ts,
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int tx_tchf_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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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
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int rx_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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sbit_t *bits, int8_t rssi, int16_t toa256);
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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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const struct trx_lchan_desc trx_lchan_desc[_TRX_CHAN_MAX] = {
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const struct trx_lchan_desc trx_lchan_desc[_TRX_CHAN_MAX] = {
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{
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{
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TRXC_IDLE, "IDLE",
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TRXC_IDLE, "IDLE",
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@ -3,6 +3,7 @@
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* TDMA scheduler: handlers for DL / UL bursts on logical channels
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* TDMA scheduler: handlers for DL / UL bursts on logical channels
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*
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*
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* (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
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* (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
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* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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*
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*
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* All Rights Reserved
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* All Rights Reserved
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*
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*
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@ -23,11 +24,27 @@
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*/
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*/
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#include <errno.h>
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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 <stdint.h>
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#include <stdbool.h>
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#include <stdbool.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/coding/gsm0503_coding.h>
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#include <osmocom/codec/codec.h>
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#include "l1ctl_proto.h"
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#include "scheduler.h"
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#include "scheduler.h"
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#include "sched_trx.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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static const uint8_t tch_h0_traffic_block_map[3][4] = {
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static const uint8_t tch_h0_traffic_block_map[3][4] = {
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/* B0(0,2,4,6), B1(4,6,8,10), B2(8,10,0,2) */
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/* B0(0,2,4,6), B1(4,6,8,10), B2(8,10,0,2) */
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@ -181,3 +198,305 @@ uint32_t sched_tchh_block_dl_first_fn(enum trx_lchan_type chan,
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/* Couldn't calculate the first fn, return the last */
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/* Couldn't calculate the first fn, return the last */
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return last_fn;
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return last_fn;
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}
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}
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int rx_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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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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int n_errors = -1, n_bits_total, rc;
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sbit_t *buffer, *offset;
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uint8_t l2[128], *mask;
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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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mask = &lchan->rx_burst_mask;
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buffer = lchan->rx_bursts;
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LOGP(DSCHD, LOGL_DEBUG, "Traffic received on %s: fn=%u ts=%u bid=%u\n",
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lchan_desc->name, fn, ts->index, bid);
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if (*mask == 0x00) {
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/* Align to the first burst */
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if (bid > 0)
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return 0;
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/* Align reception of the first FACCH/H frame */
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if (lchan->tch_mode == GSM48_CMODE_SIGN) {
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if (!sched_tchh_facch_start(lchan->type, fn, 0))
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return 0;
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} else { /* or TCH/H traffic frame */
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if (!sched_tchh_traffic_start(lchan->type, fn, 0))
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return 0;
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}
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}
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/* Update mask */
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*mask |= (1 << bid);
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/**
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* FIXME: properly update measurements
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*
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* Since TCH/H channel is using block-diagonal interleaving,
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* a single burst may carry 57 bits of one encoded frame,
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* and 57 bits of another. This should be taken into account.
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*/
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lchan->meas.rssi_sum += rssi;
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lchan->meas.toa256_sum += toa256;
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lchan->meas.rssi_num++;
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lchan->meas.toa256_num++;
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/* Copy burst to the end of buffer of 6 bursts */
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offset = buffer + bid * 116 + 464;
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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 the second burst */
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if (bid != 1)
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return 0;
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/* Wait for complete set of bursts */
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if (lchan->tch_mode == GSM48_CMODE_SIGN) {
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/* FACCH/H is interleaved over 6 bursts */
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if ((*mask & 0x3f) != 0x3f)
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goto bfi_shift;
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} else {
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/* Traffic is interleaved over 4 bursts */
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if ((*mask & 0x0f) != 0x0f)
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goto bfi_shift;
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}
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/* Skip decoding attempt in case of FACCH/H */
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if (lchan->dl_ongoing_facch) {
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lchan->dl_ongoing_facch = false;
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goto bfi_shift; /* 2/2 BFI */
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}
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switch (lchan->tch_mode) {
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case GSM48_CMODE_SIGN:
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case GSM48_CMODE_SPEECH_V1: /* HR */
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rc = gsm0503_tch_hr_decode(l2, buffer,
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!sched_tchh_facch_end(lchan->type, fn, 0),
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&n_errors, &n_bits_total);
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break;
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case GSM48_CMODE_SPEECH_AMR: /* AMR */
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/**
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* TODO: AMR requires a dedicated loop,
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* which will be implemented later...
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*/
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LOGP(DSCHD, LOGL_ERROR, "AMR isn't supported yet\n");
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return -ENOTSUP;
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default:
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LOGP(DSCHD, LOGL_ERROR, "Invalid TCH mode: %u\n", lchan->tch_mode);
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return -EINVAL;
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}
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/* Shift buffer by 4 bursts for interleaving */
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memcpy(buffer, buffer + 232, 232);
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memcpy(buffer + 232, buffer + 464, 232);
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/* Shift burst mask */
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*mask = *mask << 2;
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/* Check decoding result */
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if (rc < 4) {
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LOGP(DSCHD, LOGL_ERROR, "Received bad TCH frame ending at "
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"fn=%u on %s (rc=%d)\n", fn, lchan_desc->name, rc);
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/* Send BFI */
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goto bfi;
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} else if (rc == GSM_MACBLOCK_LEN) {
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/* Skip decoding of the next 2 stolen bursts */
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lchan->dl_ongoing_facch = true;
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/* Calculate TDMA frame number of the first burst */
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lchan->rx_first_fn = sched_tchh_block_dl_first_fn(lchan->type,
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fn, true); /* FACCH/H */
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/* FACCH/H received, forward to the higher layers */
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sched_send_dt_ind(trx, ts, lchan, l2, GSM_MACBLOCK_LEN,
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n_errors, false, false);
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/* 1/2 BFI */
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goto bfi;
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} else {
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/* A good TCH frame received */
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l2_len = rc;
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}
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/* Calculate TDMA frame number of the first burst */
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lchan->rx_first_fn = sched_tchh_block_dl_first_fn(lchan->type,
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fn, false); /* TCH/H */
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/* Send a traffic frame to the higher layers */
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return sched_send_dt_ind(trx, ts, lchan, l2, l2_len,
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n_errors, false, true);
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bfi_shift:
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/* Shift buffer */
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memcpy(buffer, buffer + 232, 232);
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memcpy(buffer + 232, buffer + 464, 232);
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/* Shift burst mask */
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*mask = *mask << 2;
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bfi:
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/* Didn't try to decode */
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if (n_errors < 0)
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n_errors = 116 * 2;
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/* Calculate TDMA frame number of the first burst */
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lchan->rx_first_fn = sched_tchh_block_dl_first_fn(lchan->type,
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fn, false); /* TCH/H */
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/* BFI is not applicable in signalling mode */
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if (lchan->tch_mode == GSM48_CMODE_SIGN)
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return sched_send_dt_ind(trx, ts, lchan, NULL, 0,
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n_errors, true, false);
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/* Bad frame indication */
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l2_len = sched_bad_frame_ind(l2, lchan);
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/* Send a BFI frame to the higher layers */
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return sched_send_dt_ind(trx, ts, lchan, l2, l2_len,
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n_errors, true, true);
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}
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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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{
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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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size_t l2_len;
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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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/* Align to the first burst */
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if (*mask == 0x00)
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return 0;
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goto send_burst;
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}
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if (*mask == 0x00) {
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/* Align transmission of the first FACCH/H frame */
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if (lchan->tch_mode == GSM48_CMODE_SIGN)
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if (!sched_tchh_facch_start(lchan->type, fn, 1))
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return 0;
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}
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/* Shift buffer by 2 bursts back for interleaving */
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memcpy(buffer, buffer + 232, 232);
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/* Also shift TX burst mask */
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*mask = *mask << 2;
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/* If FACCH/H blocks are still pending */
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if (lchan->ul_facch_blocks > 2) {
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memcpy(buffer + 232, buffer + 464, 232);
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goto send_burst;
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}
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/* Check the current TCH mode */
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switch (lchan->tch_mode) {
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case GSM48_CMODE_SIGN:
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case GSM48_CMODE_SPEECH_V1: /* HR */
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l2_len = GSM_HR_BYTES + 1;
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break;
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case GSM48_CMODE_SPEECH_AMR: /* AMR */
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/**
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* TODO: AMR requires a dedicated loop,
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* which will be implemented later...
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*/
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LOGP(DSCHD, LOGL_ERROR, "AMR isn't supported yet, "
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"dropping frame...\n");
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/* Forget this primitive */
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sched_prim_drop(lchan);
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return -ENOTSUP;
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default:
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LOGP(DSCHD, LOGL_ERROR, "Invalid TCH mode: %u, "
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"dropping frame...\n", lchan->tch_mode);
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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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/* Determine payload length */
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if (PRIM_IS_FACCH(lchan->prim)) {
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l2_len = GSM_MACBLOCK_LEN; /* FACCH */
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} else if (lchan->prim->payload_len != l2_len) {
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LOGP(DSCHD, LOGL_ERROR, "Primitive has odd length %zu "
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"(expected %zu for TCH or %u for FACCH), so dropping...\n",
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lchan->prim->payload_len, l2_len, GSM_MACBLOCK_LEN);
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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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/* Encode the payload */
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rc = gsm0503_tch_hr_encode(buffer, lchan->prim->payload, l2_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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/* A FACCH/H frame occupies 6 bursts */
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if (PRIM_IS_FACCH(lchan->prim))
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lchan->ul_facch_blocks = 6;
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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 transceiver */
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sched_trx_handle_tx_burst(trx, ts, lchan, fn, burst);
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/* In case of a FACCH/H frame, one block less */
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if (lchan->ul_facch_blocks)
|
||||||
|
lchan->ul_facch_blocks--;
|
||||||
|
|
||||||
|
if ((*mask & 0x0f) == 0x0f) {
|
||||||
|
/**
|
||||||
|
* If no more FACCH/H blocks pending,
|
||||||
|
* confirm data / traffic sending
|
||||||
|
*/
|
||||||
|
if (!lchan->ul_facch_blocks)
|
||||||
|
sched_send_dt_conf(trx, ts, lchan, fn,
|
||||||
|
PRIM_IS_TCH(lchan->prim));
|
||||||
|
|
||||||
|
/* Forget processed primitive */
|
||||||
|
sched_prim_drop(lchan);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
|
@ -463,7 +463,7 @@ static void sched_trx_reset_lchan(struct trx_lchan_state *lchan)
|
||||||
/* TCH specific variables */
|
/* TCH specific variables */
|
||||||
if (CHAN_IS_TCH(lchan->type)) {
|
if (CHAN_IS_TCH(lchan->type)) {
|
||||||
lchan->dl_ongoing_facch = 0;
|
lchan->dl_ongoing_facch = 0;
|
||||||
lchan->ul_ongoing_facch = 0;
|
lchan->ul_facch_blocks = 0;
|
||||||
|
|
||||||
lchan->tch_mode = GSM48_CMODE_SIGN;
|
lchan->tch_mode = GSM48_CMODE_SIGN;
|
||||||
|
|
||||||
|
|
|
@ -171,9 +171,9 @@ struct trx_lchan_state {
|
||||||
uint8_t tch_mode;
|
uint8_t tch_mode;
|
||||||
|
|
||||||
/*! \brief FACCH/H on downlink */
|
/*! \brief FACCH/H on downlink */
|
||||||
uint8_t dl_ongoing_facch;
|
bool dl_ongoing_facch;
|
||||||
/*! \brief FACCH/H on uplink */
|
/*! \brief pending FACCH/H blocks on Uplink */
|
||||||
uint8_t ul_ongoing_facch;
|
uint8_t ul_facch_blocks;
|
||||||
|
|
||||||
struct {
|
struct {
|
||||||
/*! \brief Number of RSSI values */
|
/*! \brief Number of RSSI values */
|
||||||
|
|
Loading…
Reference in New Issue