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/* PDCH scheduler
*
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gprs_bssgp_pcu.h>
#include <gprs_rlcmac.h>
#include <pcu_l1_if.h>
extern struct llist_head block_queue;
static uint8_t rlcmac_dl_idle[23] = {
0x47, /* control without optional header octets, no polling, USF=111 */
0x94, /* dummy downlink control message, paging mode 00 */
0x2b, /* no persistance level, 7 bits spare pattern */
0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
};
int gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
uint32_t fn, uint8_t block_nr)
{
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
struct gprs_rlcmac_pdch *pdch;
struct gprs_rlcmac_tbf *tbf, *poll_tbf = NULL, *dl_ass_tbf = NULL,
*ul_ass_tbf = NULL, *ul_ack_tbf = NULL;
uint8_t usf = 0x7;
struct msgb *msg = NULL;
uint32_t poll_fn;
uint8_t i, tfi;
if (trx >= 8 || ts >= 8)
return -EINVAL;
pdch = &bts->trx[trx].pdch[ts];
if (!pdch->enable) {
LOGP(DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled PDCH: "
"TRX=%d TS=%d\n", trx, ts);
return -EIO;
}
/* store last frame number of RTS */
pdch->last_rts_fn = fn;
/* check special TBF for events */
poll_fn = fn + 4;
if ((block_nr % 3) == 2)
poll_fn ++;
poll_fn = poll_fn % 2715648;
llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
/* this trx, this ts */
if (tbf->trx != trx || tbf->control_ts != ts)
continue;
/* polling for next uplink block */
if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
&& tbf->poll_fn == poll_fn)
poll_tbf = tbf;
if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
dl_ass_tbf = tbf;
if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
ul_ass_tbf = tbf;
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_SEND_ACK)
ul_ack_tbf = tbf;
}
llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
/* this trx, this ts */
if (tbf->trx != trx || tbf->control_ts != ts)
continue;
/* polling for next uplink block */
if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
&& tbf->poll_fn == poll_fn)
poll_tbf = tbf;
if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
dl_ass_tbf = tbf;
if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
ul_ass_tbf = tbf;
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_SEND_ACK)
ul_ack_tbf = tbf;
}
/* check uplink ressource for polling */
if (poll_tbf) {
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
"TS=%d FN=%d block_nr=%d scheduling free USF for "
"polling at FN=%d of %s TFI=%d\n", trx, ts, fn,
block_nr, poll_fn,
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL",
poll_tbf->tfi);
/* use free USF */
/* else, we search for uplink ressource */
} else {
/* select uplink ressource */
for (i = 0, tfi = pdch->next_ul_tfi; i < 32;
i++, tfi = (tfi + 1) & 31) {
tbf = pdch->ul_tbf[tfi];
/* no TBF for this tfi, go next */
if (!tbf)
continue;
/* no UL ressources needed, go next */
/* we don't need to give ressources in FINISHED state,
* because we have received all blocks and only poll
* for packet control ack. */
if (tbf->state != GPRS_RLCMAC_FLOW)
continue;
/* use this USF */
usf = tbf->dir.ul.usf[ts];
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: "
"TRX=%d TS=%d FN=%d block_nr=%d scheduling "
"USF=%d for required uplink ressource of "
"UL TBF=%d\n", trx, ts, fn, block_nr, usf, tfi);
/* next TBF to handle ressource is the next one */
pdch->next_ul_tfi = (tfi + 1) & 31;
break;
}
}
/* Prio 1: select control message */
/* schedule PACKET DOWNLINK ASSIGNMENT */
if (dl_ass_tbf) {
tbf = dl_ass_tbf;
msg = gprs_rlcmac_send_packet_downlink_assignment(tbf, fn);
} else
/* schedule PACKET UPLINK ASSIGNMENT */
if (ul_ass_tbf) {
tbf = ul_ass_tbf;
msg = gprs_rlcmac_send_packet_uplink_assignment(tbf, fn);
} else
/* schedule PACKET UPLINK ACK */
if (ul_ack_tbf) {
tbf = ul_ack_tbf;
msg = gprs_rlcmac_send_uplink_ack(tbf, fn);
}
if (msg) {
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
"message at RTS for %s TBF=%d (TRX=%d, TS=%d)\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF)
? "UL" : "DL", tbf->tfi, trx, ts);
}
/* Prio 2: select data message for downlink */
if (!msg) {
/* select downlink ressource */
for (i = 0, tfi = pdch->next_dl_tfi; i < 32;
i++, tfi = (tfi + 1) & 31) {
tbf = pdch->dl_tbf[tfi];
/* no TBF for this tfi, go next */
if (!tbf)
continue;
/* no DL TBF, go next */
if (tbf->direction != GPRS_RLCMAC_DL_TBF)
continue;
/* no DL ressources needed, go next */
if (tbf->state != GPRS_RLCMAC_FLOW
&& tbf->state != GPRS_RLCMAC_FINISHED)
continue;
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data "
"message at RTS for DL TBF=%d (TRX=%d, "
"TS=%d)\n", tfi, trx, ts);
/* next TBF to handle ressource is the next one */
pdch->next_dl_tfi = (tfi + 1) & 31;
/* generate DL data block */
msg = gprs_rlcmac_send_data_block_acknowledged(tbf, fn,
ts);
break;
}
}
/* Prio 3: send dummy contol message */
if (!msg) {
msg = msgb_alloc(23, "rlcmac_dl_idle");
if (!msg)
return -ENOMEM;
memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23);
}
/* msg is now available */
/* set USF */
msg->data[0] = (msg->data[0] & 0xf8) | usf;
// printf("len=%d, date=%s\n", msg->len, osmo_hexdump(msg->data, msg->len));
/* send PDTCH/PACCH to L1 */
pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr);
return 0;
}
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