Introducing scheduler to process transmission of blocks
The scheduler is triggered at ready-to-send-requesst. It schedules control blocks, data block and dummy blocks, depending on priority. It provides upstream ressource by setting USF. The ressources are assigned, if required. The ressources are dispatched round-robin. In case of polling, the upstream ressource is given to MS at the time it will respond to polling request.
This commit is contained in:
Andreas Eversberg
parent
7d7cf54f39
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39621c41f3
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/* 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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extern struct llist_head block_queue;
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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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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 *tbf;
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uint8_t usf = 0x7;
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struct msgb *msg = NULL;
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uint32_t poll_fn;
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uint8_t i, tfi;
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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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/* check uplink ressource for polling */
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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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for (tfi = 0; tfi < 32; tfi++) {
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tbf = pdch->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 polling */
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if (tbf->poll_state != GPRS_RLCMAC_POLL_SCHED)
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continue;
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/* polling for next uplink block */
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if (tbf->poll_fn == poll_fn)
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break;
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}
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/* found uplink where a block is polled */
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if (tfi < 32) {
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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 TFI=%d\n", trx, ts, fn, block_nr,
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poll_fn, tfi);
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/* reset poll state */
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tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
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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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/* 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->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 TBF, go next */
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if (tbf->direction != GPRS_RLCMAC_UL_TBF)
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continue;
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/* no UL ressources needed, go next */
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if (tbf->state != GPRS_RLCMAC_FLOW)
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continue;
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break;
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}
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if (i < 32) {
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/* use this USF */
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usf = tbf->dir.ul.usf;
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: "
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"TRX=%d TS=%d FN=%d block_nr=%d scheduling "
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"USF=%d for required uplink ressource of "
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"TFB=%d\n", trx, ts, fn, block_nr, usf, tfi);
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/* next TFB to handle ressource is the next one */
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pdch->next_ul_tfi = (tfi + 1) & 31;
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}
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}
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/* Prio 1: select control message */
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if (!msg) {
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for (tfi = 0; tfi < 32; tfi++) {
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tbf = pdch->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 TBF, go next */
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if (tbf->direction != GPRS_RLCMAC_UL_TBF)
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continue;
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if (tbf->dir.ul.substate == GPRS_RLCMAC_UL_SEND_ACK)
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break;
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}
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if (tfi < 32) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
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"message at RTS for TFB=%d\n", tfi);
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/* generate ack message */
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msg = gprs_rlcmac_send_uplink_ack(tbf, fn);
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}
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}
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/* Prio 2: select data message for downlink */
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if (!msg) {
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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->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 DD TBF, go next */
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if (tbf->direction != GPRS_RLCMAC_DL_TBF)
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continue;
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/* FIXME: */
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}
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if (i < 32) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data "
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"message at RTS for TFB=%d\n", tfi);
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/* next TFB to handle ressource is the next one */
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pdch->next_dl_tfi = (tfi + 1) & 31;
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/* generate ack message */
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/* FIXME: */
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}
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/* FIXME: remove that when DL TBF is finished */
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set_current_fn(fn);
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msg = msgb_dequeue(&block_queue);
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}
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/* Prio 3: send dummy contol message */
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if (!msg) {
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msg = msgb_alloc(23, "rlcmac_dl_idle");
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if (!msg)
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return -ENOMEM;
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memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23);
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}
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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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// printf("len=%d, date=%s\n", msg->len, osmo_hexdump(msg->data, msg->len));
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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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