210 lines
5.5 KiB
C++
210 lines
5.5 KiB
C++
/* gprs_rlcmac.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <gprs_bssgp_pcu.h>
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#include <pcu_l1_if.h>
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#include <gprs_rlcmac.h>
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#include <bts.h>
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#include <encoding.h>
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#include <tbf.h>
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extern void *tall_pcu_ctx;
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#ifdef DEBUG_DIAGRAM
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struct timeval diagram_time = {0,0};
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struct timeval diagram_last_tv = {0,0};
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void debug_diagram(BTS *bts, int diag, const char *format, ...)
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{
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va_list ap;
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char debug[128];
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char line[1024];
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struct gprs_rlcmac_tbf *tbf, *tbf_a[16];
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int max_diag = -1, i;
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uint64_t diff = 0;
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va_start(ap, format);
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vsnprintf(debug, sizeof(debug) - 1, format, ap);
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debug[19] = ' ';
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debug[20] = '\0';
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va_end(ap);
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memset(tbf_a, 0, sizeof(tbf_a));
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llist_for_each_entry(tbf, &bts->bts_data()->ul_tbfs, list) {
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if (tbf->diag < 16) {
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if (tbf->diag > max_diag)
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max_diag = tbf->diag;
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tbf_a[tbf->diag] = tbf;
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}
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}
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llist_for_each_entry(tbf, &bts->bts_data()->dl_tbfs, list) {
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if (tbf->diag < 16) {
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if (tbf->diag > max_diag)
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max_diag = tbf->diag;
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tbf_a[tbf->diag] = tbf;
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}
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}
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if (diagram_last_tv.tv_sec) {
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diff = (uint64_t)(diagram_time.tv_sec -
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diagram_last_tv.tv_sec) * 1000;
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diff += diagram_time.tv_usec / 1000;
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diff -= diagram_last_tv.tv_usec / 1000;
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}
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memcpy(&diagram_last_tv, &diagram_time, sizeof(struct timeval));
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if (diff > 0) {
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if (diff > 99999)
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strcpy(line, " ... : ");
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else
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sprintf(line, "%3d.%03d: ", (int)(diff / 1000),
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(int)(diff % 1000));
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for (i = 0; i <= max_diag; i++) {
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if (tbf_a[i] == NULL) {
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strcat(line, " ");
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continue;
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}
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if (tbf_a[i]->diag_new) {
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strcat(line, " | ");
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continue;
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}
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strcat(line, " ");
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}
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puts(line);
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}
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strcpy(line, " : ");
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for (i = 0; i <= max_diag; i++) {
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if (tbf_a[i] == NULL) {
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strcat(line, " ");
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continue;
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}
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if (tbf_a[i]->diag != diag) {
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strcat(line, " | ");
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continue;
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}
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if (strlen(debug) < 19) {
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strcat(line, " ");
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memcpy(line + strlen(line) - 11 - strlen(debug) / 2,
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debug, strlen(debug));
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} else
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strcat(line, debug);
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tbf_a[i]->diag_new = 1;
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}
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puts(line);
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}
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#endif
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/* FIXME: spread resources over multiple TRX. Also add option to use same
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* TRX in case of existing TBF for TLLI in the other direction. */
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/* search for free TFI and return TFI, TRX */
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int tfi_find_free(struct gprs_rlcmac_bts *bts, enum gprs_rlcmac_tbf_direction dir,
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uint8_t *_trx, int8_t use_trx)
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{
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struct gprs_rlcmac_pdch *pdch;
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struct gprs_rlcmac_tbf **tbfp;
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uint8_t trx_from, trx_to, trx, ts, tfi;
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if (use_trx >= 0 && use_trx < 8)
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trx_from = trx_to = use_trx;
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else {
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trx_from = 0;
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trx_to = 7;
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}
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/* on TRX find first enabled TS */
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for (trx = trx_from; trx <= trx_to; trx++) {
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for (ts = 0; ts < 8; ts++) {
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pdch = &bts->trx[trx].pdch[ts];
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if (!pdch->is_enabled())
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continue;
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break;
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}
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if (ts < 8)
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break;
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}
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if (trx > trx_to) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
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return -EINVAL;
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "Searching for first unallocated TFI: "
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"TRX=%d first TS=%d\n", trx, ts);
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if (dir == GPRS_RLCMAC_UL_TBF)
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tbfp = bts->trx[trx].ul_tbf;
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else
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tbfp = bts->trx[trx].dl_tbf;
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for (tfi = 0; tfi < 32; tfi++) {
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if (!tbfp[tfi])
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break;
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}
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if (tfi < 32) {
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LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi);
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*_trx = trx;
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return tfi;
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}
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LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n");
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return -1;
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}
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/* Send Uplink unit-data to SGSN. */
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int gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf)
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{
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uint8_t qos_profile[3];
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struct msgb *llc_pdu;
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unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + tbf->llc_index;
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struct bssgp_bvc_ctx *bctx = gprs_bssgp_pcu_current_bctx();
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LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] TFI: %u TLLI: 0x%08x len=%d\n", tbf->tfi, tbf->tlli, tbf->llc_index);
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if (!bctx) {
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LOGP(DBSSGP, LOGL_ERROR, "No bctx\n");
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return -EIO;
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}
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llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu");
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uint8_t *buf = msgb_push(llc_pdu, TL16V_GROSS_LEN(sizeof(uint8_t)*tbf->llc_index));
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tl16v_put(buf, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*tbf->llc_index, tbf->llc_frame);
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qos_profile[0] = QOS_PROFILE >> 16;
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qos_profile[1] = QOS_PROFILE >> 8;
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qos_profile[2] = QOS_PROFILE;
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bssgp_tx_ul_ud(bctx, tbf->tlli, qos_profile, llc_pdu);
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return 0;
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}
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int gprs_rlcmac_paging_request(uint8_t *ptmsi, uint16_t ptmsi_len,
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const char *imsi)
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{
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LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Paging Request (CCCH)\n");
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bitvec *paging_request = bitvec_alloc(23);
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bitvec_unhex(paging_request, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
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int plen = Encoding::write_paging_request(paging_request, ptmsi, ptmsi_len);
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pcu_l1if_tx_pch(paging_request, plen, (char *)imsi);
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bitvec_free(paging_request);
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return 0;
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}
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