297 lines
8.5 KiB
C++
297 lines
8.5 KiB
C++
/* PDCH scheduler
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*
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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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 <gprs_rlcmac.h>
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#include <pcu_l1_if.h>
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uint32_t sched_poll(uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr,
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struct gprs_rlcmac_tbf **poll_tbf,
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struct gprs_rlcmac_tbf **ul_ass_tbf,
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struct gprs_rlcmac_tbf **dl_ass_tbf,
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struct gprs_rlcmac_tbf **ul_ack_tbf)
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{
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struct gprs_rlcmac_tbf *tbf;
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uint32_t poll_fn;
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/* check special TBF for events */
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poll_fn = fn + 4;
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if ((block_nr % 3) == 2)
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poll_fn ++;
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poll_fn = poll_fn % 2715648;
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llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
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/* this trx, this ts */
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if (tbf->trx != trx || tbf->control_ts != ts)
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continue;
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/* polling for next uplink block */
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if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == poll_fn)
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*poll_tbf = tbf;
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if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_SEND_ACK)
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*ul_ack_tbf = tbf;
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if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
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*dl_ass_tbf = tbf;
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if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
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*ul_ass_tbf = tbf;
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}
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llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
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/* this trx, this ts */
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if (tbf->trx != trx || tbf->control_ts != ts)
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continue;
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/* polling for next uplink block */
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if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == poll_fn)
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*poll_tbf = tbf;
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if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
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*dl_ass_tbf = tbf;
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if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
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*ul_ass_tbf = tbf;
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}
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return poll_fn;
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}
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uint32_t sched_sba(uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr)
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{
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uint32_t sba_fn;
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struct gprs_rlcmac_sba *sba;
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/* check special TBF for events */
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sba_fn = fn + 4;
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if ((block_nr % 3) == 2)
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sba_fn ++;
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sba_fn = sba_fn % 2715648;
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sba = sba_find(trx, ts, sba_fn);
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if (sba) {
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llist_del(&sba->list);
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talloc_free(sba);
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return sba_fn;
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}
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return 0xffffffff;
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}
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uint8_t sched_select_uplink(uint8_t trx, uint8_t ts, uint32_t fn,
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uint8_t block_nr, struct gprs_rlcmac_pdch *pdch)
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{
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struct gprs_rlcmac_tbf *tbf;
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uint8_t usf = 0x07;
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uint8_t i, tfi;
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/* select uplink ressource */
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for (i = 0, tfi = pdch->next_ul_tfi; i < 32;
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i++, tfi = (tfi + 1) & 31) {
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tbf = pdch->ul_tbf[tfi];
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/* no TBF for this tfi, go next */
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if (!tbf)
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continue;
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/* no UL ressources needed, go next */
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/* we don't need to give ressources in FINISHED state,
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* because we have received all blocks and only poll
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* for packet control ack. */
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if (tbf->state != GPRS_RLCMAC_FLOW)
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continue;
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/* use this USF */
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usf = tbf->dir.ul.usf[ts];
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
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"TS=%d FN=%d block_nr=%d scheduling USF=%d for "
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"required uplink ressource of UL TBF=%d\n", trx, ts, fn,
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block_nr, usf, tfi);
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/* next TBF to handle ressource is the next one */
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pdch->next_ul_tfi = (tfi + 1) & 31;
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break;
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}
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return usf;
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}
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struct msgb *sched_select_ctrl_msg(uint8_t trx, uint8_t ts, uint32_t fn,
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uint8_t block_nr, struct gprs_rlcmac_pdch *pdch,
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struct gprs_rlcmac_tbf *ul_ass_tbf,
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struct gprs_rlcmac_tbf *dl_ass_tbf,
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struct gprs_rlcmac_tbf *ul_ack_tbf)
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{
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struct msgb *msg = NULL;
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struct gprs_rlcmac_tbf *tbf = NULL;
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/* schedule PACKET UPLINK ASSIGNMENT (1st priority) */
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if (ul_ass_tbf) {
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tbf = ul_ass_tbf;
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msg = gprs_rlcmac_send_packet_uplink_assignment(tbf, fn);
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}
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/* schedule PACKET DOWNLINK ASSIGNMENT (2nd priotiry) */
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if (!msg && dl_ass_tbf) {
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tbf = dl_ass_tbf;
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msg = gprs_rlcmac_send_packet_downlink_assignment(tbf, fn);
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}
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/* schedule PACKET UPLINK ACK (3rd priority) */
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if (!msg && ul_ack_tbf) {
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tbf = ul_ack_tbf;
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msg = gprs_rlcmac_send_uplink_ack(tbf, fn);
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}
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/* any message */
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if (msg) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
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"message at RTS for %s TBF=%d (TRX=%d, TS=%d)\n",
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(tbf->direction == GPRS_RLCMAC_UL_TBF)
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? "UL" : "DL", tbf->tfi, trx, ts);
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return msg;
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}
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/* schedule PACKET PAGING REQUEST */
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if (!llist_empty(&pdch->paging_list))
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msg = gprs_rlcmac_send_packet_paging_request(pdch);
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if (msg) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling paging request "
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"message at RTS for (TRX=%d, TS=%d)\n", trx, ts);
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return msg;
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}
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return NULL;
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}
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struct msgb *sched_select_downlink(uint8_t trx, uint8_t ts, uint32_t fn,
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uint8_t block_nr, struct gprs_rlcmac_pdch *pdch)
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{
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struct msgb *msg = NULL;
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struct gprs_rlcmac_tbf *tbf = NULL;
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uint8_t i, tfi;
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/* select downlink ressource */
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for (i = 0, tfi = pdch->next_dl_tfi; i < 32;
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i++, tfi = (tfi + 1) & 31) {
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tbf = pdch->dl_tbf[tfi];
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/* no TBF for this tfi, go next */
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if (!tbf)
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continue;
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/* no DL TBF, go next */
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if (tbf->direction != GPRS_RLCMAC_DL_TBF)
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continue;
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/* no DL ressources needed, go next */
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if (tbf->state != GPRS_RLCMAC_FLOW
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&& tbf->state != GPRS_RLCMAC_FINISHED)
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continue;
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/* waiting for CCCH IMM.ASS confirm */
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if (tbf->dir.dl.wait_confirm)
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continue;
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data message at "
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"RTS for DL TBF=%d (TRX=%d, TS=%d)\n", tfi, trx, ts);
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/* next TBF to handle ressource is the next one */
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pdch->next_dl_tfi = (tfi + 1) & 31;
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/* generate DL data block */
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msg = gprs_rlcmac_send_data_block_acknowledged(tbf, fn,
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ts);
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break;
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}
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return msg;
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}
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static uint8_t rlcmac_dl_idle[23] = {
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0x47, /* control without optional header octets, no polling, USF=111 */
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0x94, /* dummy downlink control message, paging mode 00 */
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0x2b, /* no persistance level, 7 bits spare pattern */
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0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
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0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
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};
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struct msgb *sched_dummy(void)
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{
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struct msgb *msg;
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msg = msgb_alloc(23, "rlcmac_dl_idle");
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if (!msg)
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return NULL;
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memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23);
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return msg;
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}
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int gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
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uint32_t fn, uint8_t block_nr)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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struct gprs_rlcmac_pdch *pdch;
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struct gprs_rlcmac_tbf *poll_tbf = NULL, *dl_ass_tbf = NULL,
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*ul_ass_tbf = NULL, *ul_ack_tbf = NULL;
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uint8_t usf = 0x7;
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struct msgb *msg = NULL;
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uint32_t poll_fn, sba_fn;
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if (trx >= 8 || ts >= 8)
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return -EINVAL;
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pdch = &bts->trx[trx].pdch[ts];
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if (!pdch->enable) {
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LOGP(DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled PDCH: "
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"TRX=%d TS=%d\n", trx, ts);
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return -EIO;
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}
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/* store last frame number of RTS */
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pdch->last_rts_fn = fn;
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poll_fn = sched_poll(trx, ts, fn, block_nr, &poll_tbf, &ul_ass_tbf,
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&dl_ass_tbf, &ul_ack_tbf);
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/* check uplink ressource for polling */
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if (poll_tbf)
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
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"TS=%d FN=%d block_nr=%d scheduling free USF for "
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"polling at FN=%d of %s TFI=%d\n", trx, ts, fn,
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block_nr, poll_fn,
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(poll_tbf->direction == GPRS_RLCMAC_UL_TBF)
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? "UL" : "DL", poll_tbf->tfi);
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/* use free USF */
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/* else. check for sba */
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else if ((sba_fn = sched_sba(trx, ts, fn, block_nr) != 0xffffffff))
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
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"TS=%d FN=%d block_nr=%d scheduling free USF for "
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"single block allocation at FN=%d\n", trx, ts, fn,
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block_nr, sba_fn);
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/* use free USF */
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/* else, we search for uplink ressource */
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else
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usf = sched_select_uplink(trx, ts, fn, block_nr, pdch);
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/* Prio 1: select control message */
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msg = sched_select_ctrl_msg(trx, ts, fn, block_nr, pdch, ul_ass_tbf,
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dl_ass_tbf, ul_ack_tbf);
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/* Prio 2: select data message for downlink */
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if (!msg)
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msg = sched_select_downlink(trx, ts, fn, block_nr, pdch);
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/* Prio 3: send dummy contol message */
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if (!msg)
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msg = sched_dummy();
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if (!msg)
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return -ENOMEM;
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/* msg is now available */
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/* set USF */
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msg->data[0] = (msg->data[0] & 0xf8) | usf;
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/* send PDTCH/PACCH to L1 */
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pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr);
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return 0;
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}
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