516 lines
16 KiB
C++
516 lines
16 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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#include <bts.h>
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#include <tbf.h>
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#include <tbf_ul.h>
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#include <gprs_debug.h>
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#include <gprs_ms.h>
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#include <rlc.h>
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#include <sba.h>
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#include <pdch.h>
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#include "pcu_utils.h"
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extern "C" {
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#include <osmocom/core/gsmtap.h>
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}
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static uint32_t sched_poll(BTS *bts,
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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_ul_tbf **ul_ack_tbf)
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{
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struct gprs_rlcmac_ul_tbf *ul_tbf;
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struct gprs_rlcmac_dl_tbf *dl_tbf;
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LListHead<gprs_rlcmac_tbf> *pos;
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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 % GSM_MAX_FN;
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llist_for_each(pos, &bts->ul_tbfs()) {
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ul_tbf = as_ul_tbf(pos->entry());
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OSMO_ASSERT(ul_tbf);
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/* this trx, this ts */
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if (ul_tbf->trx->trx_no != trx || !ul_tbf->is_control_ts(ts))
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continue;
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/* polling for next uplink block */
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if (ul_tbf->poll_scheduled() && ul_tbf->poll_fn == poll_fn)
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*poll_tbf = ul_tbf;
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if (ul_tbf->ul_ack_state_is(GPRS_RLCMAC_UL_ACK_SEND_ACK))
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*ul_ack_tbf = ul_tbf;
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if (ul_tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_SEND_ASS))
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*dl_ass_tbf = ul_tbf;
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if (ul_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS)
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|| ul_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ))
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*ul_ass_tbf = ul_tbf;
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/* FIXME: Is this supposed to be fair? The last TBF for each wins? Maybe use llist_add_tail and skip once we have all
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states? */
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}
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llist_for_each(pos, &bts->dl_tbfs()) {
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dl_tbf = as_dl_tbf(pos->entry());
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OSMO_ASSERT(dl_tbf);
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/* this trx, this ts */
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if (dl_tbf->trx->trx_no != trx || !dl_tbf->is_control_ts(ts))
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continue;
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/* polling for next uplink block */
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if (dl_tbf->poll_scheduled() && dl_tbf->poll_fn == poll_fn)
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*poll_tbf = dl_tbf;
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if (dl_tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_SEND_ASS))
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*dl_ass_tbf = dl_tbf;
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if (dl_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS)
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|| dl_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ))
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*ul_ass_tbf = dl_tbf;
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}
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return poll_fn;
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}
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static struct gprs_rlcmac_ul_tbf *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, bool require_gprs_only)
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{
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struct gprs_rlcmac_ul_tbf *tbf = NULL;
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uint8_t i, tfi;
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/* select uplink resource */
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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_by_tfi(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 resources needed, go next */
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/* we don't need to give resources 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_is_not(GPRS_RLCMAC_FLOW))
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continue;
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if (require_gprs_only && tbf->is_egprs_enabled())
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continue;
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/* use this USF */
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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 resource of UL TFI=%d\n", trx, ts, fn,
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block_nr, tbf->m_usf[ts], tfi);
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/* next TBF to handle resource 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 tbf;
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}
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struct msgb *sched_app_info(struct gprs_rlcmac_tbf *tbf) {
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struct gprs_rlcmac_bts *bts_data;
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struct msgb *msg = NULL;
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if (!tbf || !tbf->ms()->app_info_pending)
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return NULL;
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bts_data = BTS::main_bts()->bts_data();
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if (bts_data->app_info) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Sending Packet Application Information message\n");
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msg = msgb_copy(bts_data->app_info, "app_info_msg_sched");
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} else
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LOGP(DRLCMACSCHED, LOGL_ERROR, "MS has app_info_pending flag set, but no Packet Application Information"
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" message stored in BTS!\n");
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tbf->ms()->app_info_pending = false;
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bts_data->app_info_pending--;
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if (!bts_data->app_info_pending) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Packet Application Information successfully sent to all MS with active"
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" TBF\n");
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msgb_free(bts_data->app_info);
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bts_data->app_info = NULL;
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}
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return msg;
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}
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static struct msgb *sched_select_ctrl_msg(
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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_ul_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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struct gprs_rlcmac_tbf *next_list[3] = { ul_ass_tbf, dl_ass_tbf, ul_ack_tbf };
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/* Send Packet Application Information first (ETWS primary notifications) */
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msg = sched_app_info(dl_ass_tbf);
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if (!msg) {
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for (size_t i = 0; i < ARRAY_SIZE(next_list); ++i) {
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tbf = next_list[(pdch->next_ctrl_prio + i) % 3];
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if (!tbf)
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continue;
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/*
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* Assignments for the same direction have lower precedence,
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* because they may kill the TBF when the CONTROL ACK is
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* received, thus preventing the others from being processed.
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*/
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if (tbf == ul_ass_tbf && tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ))
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msg = ul_ass_tbf->create_packet_access_reject();
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else if (tbf == ul_ass_tbf && tbf->direction ==
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GPRS_RLCMAC_DL_TBF)
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if (tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ))
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msg = ul_ass_tbf->create_packet_access_reject();
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else
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msg = ul_ass_tbf->create_ul_ass(fn, ts);
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else if (tbf == dl_ass_tbf && tbf->direction == GPRS_RLCMAC_UL_TBF)
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msg = dl_ass_tbf->create_dl_ass(fn, ts);
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else if (tbf == ul_ack_tbf)
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msg = ul_ack_tbf->create_ul_ack(fn, ts);
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if (!msg) {
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tbf = NULL;
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continue;
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}
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pdch->next_ctrl_prio += 1;
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pdch->next_ctrl_prio %= 3;
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break;
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}
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}
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if (!msg) {
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/*
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* If one of these is left, the response (CONTROL ACK) from the
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* MS will kill the current TBF, only one of them can be
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* non-NULL
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*/
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if (dl_ass_tbf) {
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tbf = dl_ass_tbf;
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msg = dl_ass_tbf->create_dl_ass(fn, ts);
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} else if (ul_ass_tbf) {
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tbf = ul_ass_tbf;
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msg = ul_ass_tbf->create_ul_ass(fn, ts);
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}
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}
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/* any message */
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if (msg) {
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if (!tbf) {
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LOGP(DRLCMACSCHED, LOGL_ERROR,
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"Control message to be scheduled, but no TBF (TRX=%d, TS=%d)\n", trx, ts);
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msgb_free(msg);
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return NULL;
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}
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tbf->rotate_in_list();
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
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"message at RTS for %s (TRX=%d, TS=%d)\n",
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tbf_name(tbf), trx, ts);
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/* Updates the dl ctrl msg counter for ms */
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tbf->ms()->update_dl_ctrl_msg();
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return msg;
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}
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/* schedule PACKET PAGING REQUEST, if any are pending */
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msg = pdch->packet_paging_request();
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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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static inline enum tbf_dl_prio tbf_compute_priority(const struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_dl_tbf *tbf,
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uint8_t ts, uint32_t fn, int age)
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{
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const gprs_rlc_dl_window *w = static_cast<gprs_rlc_dl_window *>(tbf->window());
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unsigned long msecs_t3190 = osmo_tdef_get(bts->T_defs_pcu, 3190, OSMO_TDEF_MS, -1);
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unsigned long dl_tbf_idle_msec = osmo_tdef_get(bts->T_defs_pcu, -2031, OSMO_TDEF_MS, -1);
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int age_thresh1 = msecs_to_frames(200);
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int age_thresh2 = msecs_to_frames(OSMO_MIN(msecs_t3190/2, dl_tbf_idle_msec));
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if (tbf->is_control_ts(ts) && tbf->need_control_ts())
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return DL_PRIO_CONTROL;
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if (tbf->is_control_ts(ts) && age > age_thresh2 && age_thresh2 > 0)
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return DL_PRIO_HIGH_AGE;
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if ((tbf->state_is(GPRS_RLCMAC_FLOW) && tbf->have_data()) || w->resend_needed() >= 0)
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return DL_PRIO_NEW_DATA;
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if (tbf->is_control_ts(ts) && age > age_thresh1 && tbf->keep_open(fn))
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return DL_PRIO_LOW_AGE;
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if (!w->window_empty())
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return DL_PRIO_SENT_DATA;
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return DL_PRIO_NONE;
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}
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static struct msgb *sched_select_downlink(struct gprs_rlcmac_bts *bts,
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uint8_t trx, uint8_t ts, uint32_t fn,
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uint8_t block_nr, struct gprs_rlcmac_pdch *pdch, enum mcs_kind req_mcs_kind, bool *is_egprs)
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{
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struct msgb *msg = NULL;
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struct gprs_rlcmac_dl_tbf *tbf, *prio_tbf = NULL;
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enum tbf_dl_prio prio, max_prio = DL_PRIO_NONE;
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uint8_t i, tfi, prio_tfi;
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int age;
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/* select downlink resource */
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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_by_tfi(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 resources needed, go next */
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if (tbf->state_is_not(GPRS_RLCMAC_FLOW)
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&& tbf->state_is_not(GPRS_RLCMAC_FINISHED))
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continue;
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/* waiting for CCCH IMM.ASS confirm */
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if (tbf->m_wait_confirm)
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continue;
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/* If a GPRS (CS1-4) Dl block is required, skip EGPRS(_GSMK) tbfs: */
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if (req_mcs_kind == GPRS && tbf->is_egprs_enabled())
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continue;
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age = tbf->frames_since_last_poll(fn);
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/* compute priority */
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prio = tbf_compute_priority(bts, tbf, ts, fn, age);
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if (prio == DL_PRIO_NONE)
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continue;
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/* If a GPRS (CS1-4/MCS1-4) Dl block is required, downgrade MCS
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* below instead of skipping. However, downgrade can only be
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* done on new data BSNs (not yet sent) and control blocks. */
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if (req_mcs_kind == EGPRS_GMSK && tbf->is_egprs_enabled() &&
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(prio !=DL_PRIO_CONTROL && prio != DL_PRIO_NEW_DATA)) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Cannot downgrade EGPRS TBF with prio %d\n", prio);
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continue;
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}
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/* get the TBF with the highest priority */
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if (prio > max_prio) {
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prio_tfi = tfi;
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prio_tbf = tbf;
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max_prio = prio;
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}
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}
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if (prio_tbf) {
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LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data message at "
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"RTS for DL TFI=%d (TRX=%d, TS=%d) prio=%d mcs_mode_restrict=%s\n",
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prio_tfi, trx, ts, max_prio, mode_name(req_mcs_kind));
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/* next TBF to handle resource is the next one */
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pdch->next_dl_tfi = (prio_tfi + 1) & 31;
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/* generate DL data block */
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msg = prio_tbf->create_dl_acked_block(fn, ts, req_mcs_kind);
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*is_egprs = prio_tbf->ms()->mode() != GPRS;
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}
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return msg;
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}
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static const 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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static 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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static inline void tap_n_acc(const struct msgb *msg, const struct gprs_rlcmac_bts *bts, uint8_t trx, uint8_t ts,
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uint32_t fn, enum pcu_gsmtap_category cat)
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{
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if (!msg)
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return;
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switch(cat) {
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case PCU_GSMTAP_C_DL_CTRL:
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bts->bts->do_rate_ctr_inc(CTR_RLC_SENT_CONTROL);
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bts->bts->send_gsmtap(PCU_GSMTAP_C_DL_CTRL, false, trx, ts, GSMTAP_CHANNEL_PACCH, fn, msg->data,
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msg->len);
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break;
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case PCU_GSMTAP_C_DL_DATA_GPRS:
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case PCU_GSMTAP_C_DL_DATA_EGPRS:
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bts->bts->do_rate_ctr_inc(CTR_RLC_SENT);
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bts->bts->send_gsmtap(cat, false, trx, ts, GSMTAP_CHANNEL_PDTCH, fn, msg->data,
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msg->len);
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break;
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case PCU_GSMTAP_C_DL_DUMMY:
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bts->bts->do_rate_ctr_inc(CTR_RLC_SENT_DUMMY);
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bts->bts->send_gsmtap(PCU_GSMTAP_C_DL_DUMMY, false, trx, ts, GSMTAP_CHANNEL_PACCH, fn, msg->data,
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msg->len);
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break;
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default:
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break;
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}
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}
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int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
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uint8_t trx, uint8_t ts,
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uint32_t fn, uint8_t block_nr)
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{
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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;
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struct gprs_rlcmac_ul_tbf *usf_tbf;
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struct gprs_rlcmac_ul_tbf *ul_ack_tbf = NULL;
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uint8_t usf;
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struct msgb *msg = NULL;
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uint32_t poll_fn, sba_fn;
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enum pcu_gsmtap_category gsmtap_cat;
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bool tx_is_egprs = false;
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bool require_gprs_only;
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enum mcs_kind req_mcs_kind; /* Restrict CS/MCS if DL Data block is to be sent */
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if (trx >= 8 || ts >= 8)
|
|
return -EINVAL;
|
|
pdch = &bts->trx[trx].pdch[ts];
|
|
|
|
if (!pdch->is_enabled()) {
|
|
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;
|
|
|
|
/* require_gprs_only: Prioritize USF for GPRS-only MS here,
|
|
* since anyway we'll need to tx a Dl block with CS1-4 due to
|
|
* synchronization requirements. See 3GPP TS 03.64 version
|
|
* 8.12.0
|
|
*/
|
|
require_gprs_only = (pdch->fn_without_cs14 == MS_RESYNC_NUM_FRAMES - 1);
|
|
if (require_gprs_only) {
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "TRX=%d TS=%d FN=%d "
|
|
"synchronization frame (every 18 frames), only CS1-4 allowed",
|
|
trx, ts, fn);
|
|
req_mcs_kind = GPRS; /* only GPRS CS1-4 allowed, all MS need to be able to decode it */
|
|
} else {
|
|
req_mcs_kind = EGPRS; /* all kinds are fine */
|
|
}
|
|
|
|
poll_fn = sched_poll(bts->bts, trx, ts, fn, block_nr, &poll_tbf, &ul_ass_tbf,
|
|
&dl_ass_tbf, &ul_ack_tbf);
|
|
/* check uplink resource 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\n", trx, ts, fn,
|
|
block_nr, poll_fn,
|
|
tbf_name(poll_tbf));
|
|
usf = USF_UNUSED;
|
|
/* else. check for sba */
|
|
} else if ((sba_fn = bts->bts->sba()->sched(trx, ts, fn, block_nr) != 0xffffffff)) {
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
|
|
"TS=%d FN=%d block_nr=%d scheduling free USF for "
|
|
"single block allocation at FN=%d\n", trx, ts, fn,
|
|
block_nr, sba_fn);
|
|
usf = USF_UNUSED;
|
|
/* else, we search for uplink resource */
|
|
} else {
|
|
usf_tbf = sched_select_uplink(trx, ts, fn, block_nr, pdch, require_gprs_only);
|
|
if (usf_tbf) {
|
|
usf = usf_tbf->m_usf[ts];
|
|
/* If MS selected for USF is GPRS-only, then it will
|
|
* only be able to read USF if dl block uses GMSK
|
|
* (CS1-4, MCS1-4)
|
|
*/
|
|
if (req_mcs_kind == EGPRS && usf_tbf->ms()->mode() != EGPRS)
|
|
req_mcs_kind = EGPRS_GMSK;
|
|
} else {
|
|
usf = USF_UNUSED;
|
|
}
|
|
}
|
|
|
|
/* Prio 1: select control message */
|
|
if ((msg = sched_select_ctrl_msg(trx, ts, fn, block_nr, pdch, ul_ass_tbf,
|
|
dl_ass_tbf, ul_ack_tbf))) {
|
|
gsmtap_cat = PCU_GSMTAP_C_DL_CTRL;
|
|
}
|
|
/* Prio 2: select data message for downlink */
|
|
else if((msg = sched_select_downlink(bts, trx, ts, fn, block_nr, pdch, req_mcs_kind, &tx_is_egprs))) {
|
|
gsmtap_cat = tx_is_egprs ? PCU_GSMTAP_C_DL_DATA_EGPRS :
|
|
PCU_GSMTAP_C_DL_DATA_GPRS;
|
|
}
|
|
/* Prio 3: send dummy contol message */
|
|
else if ((msg = sched_dummy())) {
|
|
/* increase counter */
|
|
msg = sched_dummy();
|
|
gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY;
|
|
} else {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (tx_is_egprs && pdch->has_gprs_only_tbf_attached()) {
|
|
pdch->fn_without_cs14 += 1;
|
|
} else {
|
|
pdch->fn_without_cs14 = 0;
|
|
}
|
|
|
|
/* msg is now available */
|
|
bts->bts->do_rate_ctr_add(CTR_RLC_DL_BYTES, msg->data_len);
|
|
|
|
/* set USF */
|
|
OSMO_ASSERT(msgb_length(msg) > 0);
|
|
msg->data[0] = (msg->data[0] & 0xf8) | usf;
|
|
|
|
/* Used to measure the leak rate, count all blocks */
|
|
gprs_bssgp_update_frames_sent();
|
|
|
|
/* Send to GSMTAP */
|
|
tap_n_acc(msg, bts, trx, ts, fn, gsmtap_cat);
|
|
|
|
/* send PDTCH/PACCH to L1 */
|
|
pcu_l1if_tx_pdtch(msg, trx, ts, bts->trx[trx].arfcn, fn, block_nr);
|
|
|
|
return 0;
|
|
}
|