1529 lines
42 KiB
C++
1529 lines
42 KiB
C++
/*
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (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 Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <bts.h>
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#include <poll_controller.h>
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#include <tbf.h>
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#include <encoding.h>
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#include <decoding.h>
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#include <rlc.h>
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#include <pcu_l1_if.h>
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#include <gprs_rlcmac.h>
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#include <gprs_debug.h>
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extern "C" {
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/stats.h>
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}
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#include <arpa/inet.h>
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#include <errno.h>
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#include <string.h>
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extern void *tall_pcu_ctx;
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static BTS s_bts;
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/**
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* For gcc-4.4 compat do not use extended initializer list but keep the
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* order from the enum here. Once we support GCC4.7 and up we can change
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* the code below.
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*/
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static const struct rate_ctr_desc bts_ctr_description[] = {
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{ "tbf.dl.alloc", "TBF DL Allocated "},
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{ "tbf.dl.freed", "TBF DL Freed "},
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{ "tbf.dl.aborted", "TBF DL Aborted "},
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{ "tbf.ul.alloc", "TBF UL Allocated "},
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{ "tbf.ul.freed", "TBF UL Freed "},
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{ "tbf.ul.aborted", "TBF UL Aborted "},
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{ "tbf.reused", "TBF Reused "},
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{ "tbf.alloc.algo-a", "TBF Alloc Algo A "},
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{ "tbf.alloc.algo-b", "TBF Alloc Algo B "},
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{ "tbf.failed.egprs-only", "TBF Failed EGPRS-only"},
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{ "rlc.sent", "RLC Sent "},
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{ "rlc.resent", "RLC Resent "},
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{ "rlc.restarted", "RLC Restarted "},
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{ "rlc.stalled", "RLC Stalled "},
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{ "rlc.nacked", "RLC Nacked "},
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{ "rlc.ass.timedout", "RLC Assign Timeout "},
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{ "rlc.ass.failed", "RLC Assign Failed "},
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{ "rlc.ack.timedout", "RLC Ack Timeout "},
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{ "rlc.ack.failed", "RLC Ack Failed "},
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{ "rlc.rel.timedout", "RLC Release Timeout "},
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{ "rlc.late-block", "RLC Late Block "},
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{ "decode.errors", "Decode Errors "},
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{ "sba.allocated", "SBA Allocated "},
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{ "sba.freed", "SBA Freed "},
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{ "sba.timedout", "SBA Timeout "},
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{ "llc.timeout", "Timedout Frames "},
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{ "llc.dropped", "Dropped Frames "},
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{ "llc.scheduled", "Scheduled Frames "},
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{ "rach.requests", "RACH requests "},
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};
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static const struct rate_ctr_group_desc bts_ctrg_desc = {
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"bts",
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"BTS Statistics",
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OSMO_STATS_CLASS_GLOBAL,
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ARRAY_SIZE(bts_ctr_description),
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bts_ctr_description,
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};
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static const struct osmo_stat_item_desc bts_stat_item_description[] = {
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{ "ms.present", "MS Present ",
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OSMO_STAT_ITEM_NO_UNIT, 4, 0},
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};
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static const struct osmo_stat_item_group_desc bts_statg_desc = {
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"bts",
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"BTS Statistics",
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OSMO_STATS_CLASS_GLOBAL,
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ARRAY_SIZE(bts_stat_item_description),
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bts_stat_item_description,
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};
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BTS* BTS::main_bts()
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{
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return &s_bts;
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}
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struct gprs_rlcmac_bts *BTS::bts_data()
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{
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return &m_bts;
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}
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struct gprs_rlcmac_bts *bts_main_data()
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{
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return BTS::main_bts()->bts_data();
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}
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struct rate_ctr_group *bts_main_data_stats()
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{
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return BTS::main_bts()->rate_counters();
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}
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BTS::BTS()
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: m_cur_fn(0)
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, m_cur_blk_fn(-1)
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, m_pollController(*this)
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, m_sba(*this)
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, m_ms_store(this)
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{
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memset(&m_bts, 0, sizeof(m_bts));
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m_bts.bts = this;
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/* initialize back pointers */
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for (size_t trx_no = 0; trx_no < ARRAY_SIZE(m_bts.trx); ++trx_no) {
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struct gprs_rlcmac_trx *trx = &m_bts.trx[trx_no];
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trx->trx_no = trx_no;
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trx->bts = this;
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for (size_t ts_no = 0; ts_no < ARRAY_SIZE(trx->pdch); ++ts_no) {
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struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no];
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pdch->ts_no = ts_no;
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pdch->trx = trx;
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}
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}
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m_ratectrs = rate_ctr_group_alloc(tall_pcu_ctx, &bts_ctrg_desc, 0);
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m_statg = osmo_stat_item_group_alloc(tall_pcu_ctx, &bts_statg_desc, 0);
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}
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BTS::~BTS()
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{
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/* this can cause counter updates and must not be left to the
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* m_ms_store's destructor */
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m_ms_store.cleanup();
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rate_ctr_group_free(m_ratectrs);
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osmo_stat_item_group_free(m_statg);
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}
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void BTS::set_current_frame_number(int fn)
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{
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/* The UL frame numbers lag 3 behind the DL frames and the data
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* indication is only sent after all 4 frames of the block have been
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* received. Sometimes there is an idle frame between the end of one
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* and start of another frame (every 3 blocks). So the timeout should
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* definitely be there if we're more than 8 frames past poll_fn. Let's
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* stay on the safe side and say 13 or more. An additional delay can
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* happen due to the block processing time in the DSP, so the delay of
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* decoded blocks relative to the timing clock can be much larger.
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* Values up to 50 frames have been observed under load. */
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const static int max_delay = 60;
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m_cur_fn = fn;
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m_pollController.expireTimedout(m_cur_fn, max_delay);
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}
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void BTS::set_current_block_frame_number(int fn, unsigned max_delay)
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{
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int delay = 0;
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const int late_block_delay_thresh = 13;
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const int fn_update_ok_min_delay = -500;
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const int fn_update_ok_max_delay = 0;
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/* frame numbers in the received blocks are assumed to be strongly
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* monotonic. */
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if (m_cur_blk_fn >= 0) {
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int delta = (fn + 2715648 * 3 / 2 - m_cur_blk_fn) % 2715648 - 2715648/2;
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if (delta <= 0)
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return;
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}
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/* Check block delay vs. the current frame number */
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if (current_frame_number() != 0)
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delay = (fn + 2715648 * 3 / 2 - current_frame_number()) % 2715648
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- 2715648/2;
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if (delay <= -late_block_delay_thresh) {
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LOGP(DRLCMAC, LOGL_NOTICE,
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"Late RLC block, FN delta: %d FN: %d curFN: %d\n",
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delay, fn, current_frame_number());
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rlc_late_block();
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}
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m_cur_blk_fn = fn;
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if (delay < fn_update_ok_min_delay || delay > fn_update_ok_max_delay ||
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current_frame_number() == 0)
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m_cur_fn = fn;
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m_pollController.expireTimedout(fn, max_delay);
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}
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int BTS::add_paging(uint8_t chan_needed, uint8_t *identity_lv)
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{
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uint8_t l, trx, ts, any_tbf = 0;
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struct gprs_rlcmac_tbf *tbf;
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LListHead<gprs_rlcmac_tbf> *pos;
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struct gprs_rlcmac_paging *pag;
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uint8_t slot_mask[8];
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int8_t first_ts; /* must be signed */
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LListHead<gprs_rlcmac_tbf> *tbfs_lists[] = {
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&m_ul_tbfs,
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&m_dl_tbfs,
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NULL
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};
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LOGP(DRLCMAC, LOGL_INFO, "Add RR paging: chan-needed=%d MI=%s\n",
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chan_needed, osmo_hexdump(identity_lv + 1, identity_lv[0]));
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/* collect slots to page
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* Mark slots for every TBF, but only mark one of it.
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* Mark only the first slot found.
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* Don't mark, if TBF uses a different slot that is already marked. */
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memset(slot_mask, 0, sizeof(slot_mask));
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for (l = 0; tbfs_lists[l]; l++) {
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llist_for_each(pos, tbfs_lists[l]) {
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tbf = pos->entry();
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first_ts = -1;
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for (ts = 0; ts < 8; ts++) {
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if (tbf->pdch[ts]) {
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/* remember the first slot found */
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if (first_ts < 0)
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first_ts = ts;
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/* break, if we already marked a slot */
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if ((slot_mask[tbf->trx->trx_no] & (1 << ts)))
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break;
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}
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}
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/* mark first slot found, if none is marked already */
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if (ts == 8 && first_ts >= 0) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- %s uses "
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"TRX=%d TS=%d, so we mark\n",
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tbf_name(tbf),
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tbf->trx->trx_no, first_ts);
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slot_mask[tbf->trx->trx_no] |= (1 << first_ts);
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} else
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LOGP(DRLCMAC, LOGL_DEBUG, "- %s uses "
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"already marked TRX=%d TS=%d\n",
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tbf_name(tbf),
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tbf->trx->trx_no, ts);
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}
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}
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/* Now we have a list of marked slots. Every TBF uses at least one
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* of these slots. */
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/* schedule paging to all marked slots */
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for (trx = 0; trx < 8; trx++) {
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if (slot_mask[trx] == 0)
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continue;
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for (ts = 0; ts < 8; ts++) {
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if ((slot_mask[trx] & (1 << ts))) {
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/* schedule */
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pag = talloc_zero(tall_pcu_ctx,
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struct gprs_rlcmac_paging);
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if (!pag)
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return -ENOMEM;
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pag->chan_needed = chan_needed;
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memcpy(pag->identity_lv, identity_lv,
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identity_lv[0] + 1);
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m_bts.trx[trx].pdch[ts].add_paging(pag);
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LOGP(DRLCMAC, LOGL_INFO, "Paging on PACCH of "
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"TRX=%d TS=%d\n", trx, ts);
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any_tbf = 1;
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}
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}
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}
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if (!any_tbf)
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LOGP(DRLCMAC, LOGL_INFO, "No paging, because no TBF\n");
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return 0;
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}
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gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
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{
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struct gprs_rlcmac_dl_tbf *tbf;
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LListHead<gprs_rlcmac_tbf> *pos;
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/* only one TBF can poll on specific TS/FN, because scheduler can only
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* schedule one downlink control block (with polling) at a FN per TS */
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llist_for_each(pos, &m_dl_tbfs) {
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tbf = as_dl_tbf(pos->entry());
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if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
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&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == fn && tbf->trx->trx_no == trx
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&& tbf->poll_ts == ts) {
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return tbf;
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}
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}
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return NULL;
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}
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gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
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{
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struct gprs_rlcmac_ul_tbf *tbf;
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LListHead<gprs_rlcmac_tbf> *pos;
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/* only one TBF can poll on specific TS/FN, because scheduler can only
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* schedule one downlink control block (with polling) at a FN per TS */
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llist_for_each(pos, &m_ul_tbfs) {
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tbf = as_ul_tbf(pos->entry());
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if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
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&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == fn && tbf->trx->trx_no == trx
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&& tbf->poll_ts == ts) {
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return tbf;
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}
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}
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return NULL;
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}
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/* lookup downlink TBF Entity (by TFI) */
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gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts)
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{
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if (trx >= 8 || ts >= 8)
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return NULL;
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return m_bts.trx[trx].pdch[ts].dl_tbf_by_tfi(tfi);
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}
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/* lookup uplink TBF Entity (by TFI) */
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gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts)
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{
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if (trx >= 8 || ts >= 8)
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return NULL;
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return m_bts.trx[trx].pdch[ts].ul_tbf_by_tfi(tfi);
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}
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/*
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* Search for free TFI and return TFI, TRX.
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* This method returns the first TFI that is currently not used in any PDCH of
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* a TRX. The first TRX that contains such an TFI is returned. Negative values
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* indicate errors.
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*/
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int BTS::tfi_find_free(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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uint32_t free_tfis;
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bool has_pdch = false;
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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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/* find a TFI that is unused on all PDCH */
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for (trx = trx_from; trx <= trx_to; trx++) {
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bool trx_has_pdch = false;
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free_tfis = 0xffffffff;
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for (ts = 0; ts < 8; ts++) {
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pdch = &m_bts.trx[trx].pdch[ts];
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if (!pdch->is_enabled())
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continue;
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free_tfis &= ~pdch->assigned_tfi(dir);
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trx_has_pdch = true;
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has_pdch = true;
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}
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if (trx_has_pdch && free_tfis)
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break;
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free_tfis = 0;
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}
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if (!has_pdch) {
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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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if (!free_tfis) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n");
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return -EBUSY;
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}
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LOGP(DRLCMAC, LOGL_DEBUG,
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"Searching for first unallocated TFI: TRX=%d\n", trx);
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/* find the first */
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for (tfi = 0; tfi < 32; tfi++) {
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if (free_tfis & 1 << tfi)
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break;
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}
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OSMO_ASSERT(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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int BTS::rcv_imm_ass_cnf(const uint8_t *data, uint32_t fn)
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{
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struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
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uint8_t plen;
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uint32_t tlli;
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GprsMs *ms;
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/* move to IA Rest Octets */
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plen = data[0] >> 2;
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data += 1 + plen;
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if ((*data & 0xf0) != 0xd0) {
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LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest "
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"octets do not start with bit sequence 'HH01' "
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"(Packet Downlink Assignment)\n");
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return -EINVAL;
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}
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/* get TLLI from downlink assignment */
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tlli = (*data++) << 28;
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tlli |= (*data++) << 20;
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tlli |= (*data++) << 12;
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tlli |= (*data++) << 4;
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tlli |= (*data++) >> 4;
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ms = ms_by_tlli(tlli);
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if (ms)
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dl_tbf = ms->dl_tbf();
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if (!dl_tbf) {
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LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x "
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"does not exit\n", tlli);
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return -EINVAL;
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli);
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if (dl_tbf->m_wait_confirm)
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tbf_timer_start(dl_tbf, 0, Tassign_agch);
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return 0;
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}
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int BTS::rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta)
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{
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struct gprs_rlcmac_ul_tbf *tbf = NULL;
|
|
uint8_t trx_no, ts_no = 0;
|
|
uint8_t sb = 0;
|
|
uint32_t sb_fn = 0;
|
|
int rc;
|
|
int plen;
|
|
uint8_t usf = 7;
|
|
uint8_t tsc;
|
|
uint16_t ta;
|
|
|
|
rach_frame();
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide "
|
|
"one:\n");
|
|
if ((ra & 0xf8) == 0x70) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block "
|
|
"allocation\n");
|
|
sb = 1;
|
|
} else if (m_bts.force_two_phase) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, "
|
|
"but we force two phase access\n");
|
|
sb = 1;
|
|
}
|
|
if (qta < 0)
|
|
qta = 0;
|
|
if (qta > 252)
|
|
qta = 252;
|
|
|
|
ta = qta >> 2;
|
|
|
|
if (sb) {
|
|
rc = sba()->alloc(&trx_no, &ts_no, &sb_fn, ta);
|
|
if (rc < 0)
|
|
return rc;
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d "
|
|
"ra=0x%02x, Fn=%d (%d,%d,%d), SBFn=%d\n",
|
|
qta, ra,
|
|
Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26,
|
|
sb_fn);
|
|
LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink "
|
|
"(AGCH)\n");
|
|
tsc = m_bts.trx[trx_no].pdch[ts_no].tsc;
|
|
} else {
|
|
// Create new TBF
|
|
#warning "Copy and pate with other routines.."
|
|
/* set class to 0, since we don't know the multislot class yet */
|
|
tbf = tbf_alloc_ul_tbf(&m_bts, NULL, -1, 0, 0, 1);
|
|
if (!tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");
|
|
/* FIXME: send reject */
|
|
return -EBUSY;
|
|
}
|
|
tbf->set_ta(ta);
|
|
tbf->set_state(GPRS_RLCMAC_FLOW);
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
tbf_timer_start(tbf, 3169, m_bts.t3169, 0);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "%s [UPLINK] START\n",
|
|
tbf_name(tbf));
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "%s RX: [PCU <- BTS] RACH "
|
|
"qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n",
|
|
tbf_name(tbf),
|
|
qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26);
|
|
LOGP(DRLCMAC, LOGL_INFO, "%s TX: START Immediate "
|
|
"Assignment Uplink (AGCH)\n", tbf_name(tbf));
|
|
trx_no = tbf->trx->trx_no;
|
|
ts_no = tbf->first_ts;
|
|
usf = tbf->m_usf[ts_no];
|
|
tsc = tbf->tsc();
|
|
}
|
|
bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */;
|
|
bitvec_unhex(immediate_assignment,
|
|
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG,
|
|
" - TRX=%d (%d) TS=%d TA=%d TSC=%d TFI=%d USF=%d\n",
|
|
trx_no, m_bts.trx[trx_no].arfcn, ts_no, ta, tsc,
|
|
tbf ? tbf->tfi() : -1, usf);
|
|
|
|
plen = Encoding::write_immediate_assignment(
|
|
tbf, immediate_assignment, 0, ra, Fn, ta,
|
|
m_bts.trx[trx_no].arfcn, ts_no, tsc, usf, 0, sb_fn,
|
|
m_bts.alpha, m_bts.gamma, -1);
|
|
|
|
if (plen >= 0) {
|
|
pcu_l1if_tx_agch(immediate_assignment, plen);
|
|
if (tbf)
|
|
tbf->set_state(GPRS_RLCMAC_WAIT_ASSIGN);
|
|
}
|
|
|
|
bitvec_free(immediate_assignment);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* depending on the current TBF, we assign on PACCH or AGCH */
|
|
void BTS::trigger_dl_ass(
|
|
struct gprs_rlcmac_dl_tbf *dl_tbf,
|
|
struct gprs_rlcmac_tbf *old_tbf)
|
|
{
|
|
/* stop pending timer */
|
|
dl_tbf->stop_timer();
|
|
|
|
/* check for downlink tbf: */
|
|
if (old_tbf) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on "
|
|
"PACCH, because %s exists\n", tbf_name(old_tbf));
|
|
old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;
|
|
|
|
old_tbf->was_releasing = old_tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE);
|
|
|
|
/* change state */
|
|
dl_tbf->set_state(GPRS_RLCMAC_ASSIGN);
|
|
if (!(dl_tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)))
|
|
dl_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
|
|
/* start timer */
|
|
tbf_timer_start(dl_tbf, 0, Tassign_pacch);
|
|
} else {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for %s on PCH, no TBF exist (IMSI=%s)\n", tbf_name(dl_tbf), dl_tbf->imsi());
|
|
dl_tbf->was_releasing = dl_tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE);
|
|
/* change state */
|
|
dl_tbf->set_state(GPRS_RLCMAC_ASSIGN);
|
|
dl_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
/* send immediate assignment */
|
|
dl_tbf->bts->snd_dl_ass(dl_tbf, 0, dl_tbf->imsi());
|
|
dl_tbf->m_wait_confirm = 1;
|
|
}
|
|
}
|
|
|
|
void BTS::snd_dl_ass(gprs_rlcmac_tbf *tbf, uint8_t poll, const char *imsi)
|
|
{
|
|
int plen;
|
|
unsigned int ts = tbf->first_ts;
|
|
|
|
LOGP(DRLCMAC, LOGL_INFO, "TX: START %s Immediate Assignment Downlink (PCH)\n", tbf_name(tbf));
|
|
bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */
|
|
bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
/* use request reference that has maximum distance to current time,
|
|
* so the assignment will not conflict with possible RACH requests. */
|
|
LOGP(DRLCMAC, LOGL_DEBUG, " - TRX=%d (%d) TS=%d TA=%d pollFN=%d\n",
|
|
tbf->trx->trx_no, tbf->trx->arfcn,
|
|
ts, tbf->ta(), poll ? tbf->poll_fn : -1);
|
|
plen = Encoding::write_immediate_assignment(tbf, immediate_assignment, 1, 125,
|
|
(tbf->pdch[ts]->last_rts_fn + 21216) % 2715648, tbf->ta(),
|
|
tbf->trx->arfcn, ts, tbf->tsc(), 7, poll,
|
|
tbf->poll_fn, m_bts.alpha, m_bts.gamma, -1);
|
|
if (plen >= 0) {
|
|
pcu_l1if_tx_pch(immediate_assignment, plen, imsi);
|
|
tbf->set_state(GPRS_RLCMAC_WAIT_ASSIGN);
|
|
}
|
|
bitvec_free(immediate_assignment);
|
|
}
|
|
|
|
|
|
GprsMs *BTS::ms_alloc(uint8_t ms_class, uint8_t egprs_ms_class)
|
|
{
|
|
GprsMs *ms;
|
|
ms = ms_store().create_ms();
|
|
|
|
ms->set_timeout(m_bts.ms_idle_sec);
|
|
ms->set_ms_class(ms_class);
|
|
ms->set_egprs_ms_class(egprs_ms_class);
|
|
|
|
return ms;
|
|
}
|
|
|
|
/*
|
|
* PDCH code below. TODO: move to a separate file
|
|
*/
|
|
|
|
void gprs_rlcmac_pdch::enable()
|
|
{
|
|
/* TODO: Check if there are still allocated resources.. */
|
|
INIT_LLIST_HEAD(&paging_list);
|
|
m_is_enabled = 1;
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::disable()
|
|
{
|
|
/* TODO.. kick free_resources once we know the TRX/TS we are on */
|
|
m_is_enabled = 0;
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::free_resources()
|
|
{
|
|
struct gprs_rlcmac_paging *pag;
|
|
|
|
/* we are not enabled. there should be no resources */
|
|
if (!is_enabled())
|
|
return;
|
|
|
|
/* kick all TBF on slot */
|
|
gprs_rlcmac_tbf::free_all(this);
|
|
|
|
/* flush all pending paging messages */
|
|
while ((pag = dequeue_paging()))
|
|
talloc_free(pag);
|
|
|
|
trx->bts->sba()->free_resources(this);
|
|
}
|
|
|
|
struct gprs_rlcmac_paging *gprs_rlcmac_pdch::dequeue_paging()
|
|
{
|
|
struct gprs_rlcmac_paging *pag;
|
|
|
|
if (llist_empty(&paging_list))
|
|
return NULL;
|
|
pag = llist_entry(paging_list.next, struct gprs_rlcmac_paging, list);
|
|
llist_del(&pag->list);
|
|
|
|
return pag;
|
|
}
|
|
|
|
struct msgb *gprs_rlcmac_pdch::packet_paging_request()
|
|
{
|
|
struct gprs_rlcmac_paging *pag;
|
|
struct msgb *msg;
|
|
unsigned wp = 0, len;
|
|
|
|
/* no paging, no message */
|
|
pag = dequeue_paging();
|
|
if (!pag)
|
|
return NULL;
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n");
|
|
|
|
/* alloc message */
|
|
msg = msgb_alloc(23, "pag ctrl block");
|
|
if (!msg) {
|
|
talloc_free(pag);
|
|
return NULL;
|
|
}
|
|
bitvec *pag_vec = bitvec_alloc(23);
|
|
if (!pag_vec) {
|
|
msgb_free(msg);
|
|
talloc_free(pag);
|
|
return NULL;
|
|
}
|
|
wp = Encoding::write_packet_paging_request(pag_vec);
|
|
|
|
/* loop until message is full */
|
|
while (pag) {
|
|
/* try to add paging */
|
|
if ((pag->identity_lv[1] & 0x07) == 4) {
|
|
/* TMSI */
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n",
|
|
ntohl(*((uint32_t *)(pag->identity_lv + 1))));
|
|
len = 1 + 1 + 1 + 32 + 2 + 1;
|
|
if (pag->identity_lv[0] != 5) {
|
|
LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with "
|
|
"MI != 5 octets!\n");
|
|
goto continue_next;
|
|
}
|
|
} else {
|
|
/* MI */
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n",
|
|
osmo_hexdump(pag->identity_lv + 1,
|
|
pag->identity_lv[0]));
|
|
len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1;
|
|
if (pag->identity_lv[0] > 8) {
|
|
LOGP(DRLCMAC, LOGL_ERROR, "Paging with "
|
|
"MI > 8 octets!\n");
|
|
goto continue_next;
|
|
}
|
|
}
|
|
if (wp + len > 184) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule "
|
|
"next time\n");
|
|
/* put back paging record, because does not fit */
|
|
llist_add_tail(&pag->list, &paging_list);
|
|
break;
|
|
}
|
|
Encoding::write_repeated_page_info(pag_vec, wp, pag->identity_lv[0],
|
|
pag->identity_lv + 1, pag->chan_needed);
|
|
|
|
continue_next:
|
|
talloc_free(pag);
|
|
pag = dequeue_paging();
|
|
}
|
|
|
|
bitvec_pack(pag_vec, msgb_put(msg, 23));
|
|
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n");
|
|
decode_gsm_rlcmac_downlink(pag_vec, mac_control_block);
|
|
LOGPC(DCSN1, LOGL_NOTICE, "\n");
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n");
|
|
bitvec_free(pag_vec);
|
|
talloc_free(mac_control_block);
|
|
|
|
return msg;
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::add_paging(struct gprs_rlcmac_paging *pag)
|
|
{
|
|
llist_add(&pag->list, &paging_list);
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::rcv_control_ack(Packet_Control_Acknowledgement_t *packet, uint32_t fn)
|
|
{
|
|
struct gprs_rlcmac_tbf *tbf, *new_tbf;
|
|
uint32_t tlli = 0;
|
|
|
|
tlli = packet->TLLI;
|
|
tbf = bts()->ul_tbf_by_poll_fn(fn, trx_no(), ts_no);
|
|
if (!tbf)
|
|
tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
|
|
|
|
if (!tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
|
|
"unknown FN=%u TLLI=0x%08x (TRX %d TS %d)\n",
|
|
fn, tlli, trx_no(), ts_no);
|
|
return;
|
|
}
|
|
tbf->update_ms(tlli, GPRS_RLCMAC_UL_TBF);
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] %s Packet Control Ack\n", tbf_name(tbf));
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
|
|
|
|
/* check if this control ack belongs to packet uplink ack */
|
|
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END %s\n", tbf_name(tbf));
|
|
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
|
|
if ((tbf->state_flags &
|
|
(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
|
|
tbf->state_flags &=
|
|
~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
|
|
"ack for UL %s\n", tbf_name(tbf));
|
|
}
|
|
tbf_free(tbf);
|
|
return;
|
|
}
|
|
if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED %s\n", tbf_name(tbf));
|
|
/* reset N3105 */
|
|
tbf->n3105 = 0;
|
|
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
|
|
|
|
new_tbf = tbf->ms() ? tbf->ms()->dl_tbf() : NULL;
|
|
if (!new_tbf) {
|
|
LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL "
|
|
"TBF is gone TLLI=0x%08x\n", tlli);
|
|
return;
|
|
}
|
|
if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) &&
|
|
tbf->direction == new_tbf->direction)
|
|
tbf_free(tbf);
|
|
|
|
if ((new_tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) {
|
|
/* We now know that the PACCH really existed */
|
|
LOGP(DRLCMAC, LOGL_INFO,
|
|
"The TBF has been confirmed on the PACCH, "
|
|
"changed type from CCCH to PACCH for %s\n",
|
|
tbf_name(new_tbf));
|
|
new_tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
new_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
|
|
}
|
|
new_tbf->set_state(GPRS_RLCMAC_FLOW);
|
|
/* stop pending assignment timer */
|
|
new_tbf->stop_timer();
|
|
if ((new_tbf->state_flags &
|
|
(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
|
|
new_tbf->state_flags &=
|
|
~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink "
|
|
"assignment for %s\n", tbf_name(new_tbf));
|
|
}
|
|
tbf_assign_control_ts(new_tbf);
|
|
return;
|
|
}
|
|
if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED %s\n", tbf_name(tbf));
|
|
/* reset N3105 */
|
|
tbf->n3105 = 0;
|
|
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
|
|
|
|
new_tbf = tbf->ms() ? tbf->ms()->ul_tbf() : NULL;
|
|
if (!new_tbf) {
|
|
LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL "
|
|
"TBF is gone TLLI=0x%08x\n", tlli);
|
|
return;
|
|
}
|
|
if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) &&
|
|
tbf->direction == new_tbf->direction)
|
|
tbf_free(tbf);
|
|
|
|
new_tbf->set_state(GPRS_RLCMAC_FLOW);
|
|
if ((new_tbf->state_flags &
|
|
(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
|
|
new_tbf->state_flags &=
|
|
~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
|
|
"assignment for UL %s\n", tbf_name(new_tbf));
|
|
}
|
|
tbf_assign_control_ts(new_tbf);
|
|
/* there might be LLC packets waiting in the queue, but the DL
|
|
* TBF might have been released while the UL TBF has been
|
|
* established */
|
|
if (new_tbf->ms()->need_dl_tbf())
|
|
new_tbf->establish_dl_tbf_on_pacch();
|
|
|
|
return;
|
|
}
|
|
LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK "
|
|
"at no request\n");
|
|
}
|
|
|
|
static void get_rx_qual_meas(struct pcu_l1_meas *meas, uint8_t rx_qual_enc)
|
|
{
|
|
static const int16_t rx_qual_map[] = {
|
|
0, /* 0,14 % */
|
|
0, /* 0,28 % */
|
|
1, /* 0,57 % */
|
|
1, /* 1,13 % */
|
|
2, /* 2,26 % */
|
|
5, /* 4,53 % */
|
|
9, /* 9,05 % */
|
|
18, /* 18,10 % */
|
|
};
|
|
|
|
meas->set_ms_rx_qual(rx_qual_map[
|
|
OSMO_MIN(rx_qual_enc, ARRAY_SIZE(rx_qual_map)-1)
|
|
]);
|
|
}
|
|
|
|
static void get_meas(struct pcu_l1_meas *meas,
|
|
const Packet_Resource_Request_t *qr)
|
|
{
|
|
unsigned i;
|
|
|
|
meas->set_ms_c_value(qr->C_VALUE);
|
|
if (qr->Exist_SIGN_VAR)
|
|
meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */
|
|
|
|
for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
|
|
{
|
|
if (qr->Slot[i].Exist) {
|
|
LOGP(DRLCMAC, LOGL_INFO,
|
|
"Packet resource request: i_level[%d] = %d\n",
|
|
i, qr->Slot[i].I_LEVEL);
|
|
meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void get_meas(struct pcu_l1_meas *meas,
|
|
const Channel_Quality_Report_t *qr)
|
|
{
|
|
unsigned i;
|
|
|
|
get_rx_qual_meas(meas, qr->RXQUAL);
|
|
meas->set_ms_c_value(qr->C_VALUE);
|
|
meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */
|
|
|
|
for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
|
|
{
|
|
if (qr->Slot[i].Exist) {
|
|
LOGP(DRLCMAC, LOGL_INFO,
|
|
"Channel quality report: i_level[%d] = %d\n",
|
|
i, qr->Slot[i].I_LEVEL_TN);
|
|
meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL_TN);
|
|
}
|
|
}
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::rcv_control_dl_ack_nack(Packet_Downlink_Ack_Nack_t *ack_nack, uint32_t fn)
|
|
{
|
|
int8_t tfi = 0; /* must be signed */
|
|
struct gprs_rlcmac_dl_tbf *tbf;
|
|
int rc;
|
|
struct pcu_l1_meas meas;
|
|
int num_blocks;
|
|
uint8_t bits_data[RLC_GPRS_WS/8];
|
|
bitvec bits;
|
|
int bsn_begin, bsn_end;
|
|
char show_bits[RLC_GPRS_WS + 1];
|
|
|
|
tfi = ack_nack->DOWNLINK_TFI;
|
|
tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
|
|
if (!tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
|
|
"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
|
|
fn, tfi, trx_no(), ts_no);
|
|
return;
|
|
}
|
|
if (tbf->tfi() != tfi) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
|
|
"wrong TFI=%d, ignoring!\n", tfi);
|
|
return;
|
|
}
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
|
|
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
|
|
tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack "
|
|
"for %s\n", tbf_name(tbf));
|
|
}
|
|
/* reset N3105 */
|
|
tbf->n3105 = 0;
|
|
tbf->stop_t3191();
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] %s Packet Downlink Ack/Nack\n", tbf_name(tbf));
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
|
|
|
|
bits.data = bits_data;
|
|
bits.data_len = sizeof(bits_data);
|
|
bits.cur_bit = 0;
|
|
|
|
num_blocks = Decoding::decode_gprs_acknack_bits(
|
|
&ack_nack->Ack_Nack_Description, &bits,
|
|
&bsn_begin, &bsn_end, &tbf->m_window);
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG,
|
|
"Got GPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), "
|
|
"\"%s\"\n",
|
|
ack_nack->Ack_Nack_Description.STARTING_SEQUENCE_NUMBER,
|
|
bsn_begin, bsn_end, num_blocks,
|
|
(Decoding::extract_rbb(&bits, show_bits), show_bits));
|
|
|
|
rc = tbf->rcvd_dl_ack(
|
|
ack_nack->Ack_Nack_Description.FINAL_ACK_INDICATION,
|
|
bsn_begin, &bits);
|
|
if (rc == 1) {
|
|
tbf_free(tbf);
|
|
return;
|
|
}
|
|
/* check for channel request */
|
|
if (ack_nack->Exist_Channel_Request_Description) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
|
|
"message, so we provide one:\n");
|
|
|
|
/* This call will register the new TBF with the MS on success */
|
|
tbf_alloc_ul(bts_data(), tbf->trx->trx_no,
|
|
tbf->ms_class(), tbf->ms()->egprs_ms_class(),
|
|
tbf->tlli(), tbf->ta(), tbf->ms());
|
|
|
|
/* schedule uplink assignment */
|
|
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
|
|
}
|
|
/* get measurements */
|
|
if (tbf->ms()) {
|
|
get_meas(&meas, &ack_nack->Channel_Quality_Report);
|
|
tbf->ms()->update_l1_meas(&meas);
|
|
}
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::rcv_control_egprs_dl_ack_nack(EGPRS_PD_AckNack_t *ack_nack, uint32_t fn)
|
|
{
|
|
int8_t tfi = 0; /* must be signed */
|
|
struct gprs_rlcmac_dl_tbf *tbf;
|
|
struct pcu_l1_meas meas;
|
|
int rc;
|
|
int num_blocks;
|
|
uint8_t bits_data[RLC_EGPRS_MAX_WS/8];
|
|
char show_bits[RLC_EGPRS_MAX_WS + 1];
|
|
bitvec bits;
|
|
int bsn_begin, bsn_end;
|
|
|
|
tfi = ack_nack->DOWNLINK_TFI;
|
|
tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
|
|
if (!tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with "
|
|
"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
|
|
fn, tfi, trx_no(), ts_no);
|
|
return;
|
|
}
|
|
if (tbf->tfi() != tfi) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with "
|
|
"wrong TFI=%d, ignoring!\n", tfi);
|
|
return;
|
|
}
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
|
|
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
|
|
tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered EGPRS downlink ack "
|
|
"for %s\n", tbf_name(tbf));
|
|
}
|
|
/* reset N3105 */
|
|
tbf->n3105 = 0;
|
|
tbf->stop_t3191();
|
|
LOGP(DRLCMAC, LOGL_DEBUG,
|
|
"RX: [PCU <- BTS] %s EGPRS Packet Downlink Ack/Nack\n",
|
|
tbf_name(tbf));
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS ACK/NACK: "
|
|
"ut: %d, final: %d, bow: %d, eow: %d, ssn: %d, have_crbb: %d, "
|
|
"urbb_len:%d, %p, %p, %d, %d, win: %d-%d, urbb: %s\n",
|
|
(int)ack_nack->EGPRS_AckNack.UnionType,
|
|
(int)ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
|
|
(int)ack_nack->EGPRS_AckNack.Desc.BEGINNING_OF_WINDOW,
|
|
(int)ack_nack->EGPRS_AckNack.Desc.END_OF_WINDOW,
|
|
(int)ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER,
|
|
(int)ack_nack->EGPRS_AckNack.Desc.Exist_CRBB,
|
|
(int)ack_nack->EGPRS_AckNack.Desc.URBB_LENGTH,
|
|
(void *)&ack_nack->EGPRS_AckNack.UnionType,
|
|
(void *)&ack_nack->EGPRS_AckNack.Desc,
|
|
(int)offsetof(EGPRS_AckNack_t, Desc),
|
|
(int)offsetof(EGPRS_AckNack_w_len_t, Desc),
|
|
tbf->m_window.v_a(),
|
|
tbf->m_window.v_s(),
|
|
osmo_hexdump((const uint8_t *)&ack_nack->EGPRS_AckNack.Desc.URBB,
|
|
sizeof(ack_nack->EGPRS_AckNack.Desc.URBB)));
|
|
|
|
bits.data = bits_data;
|
|
bits.data_len = sizeof(bits_data);
|
|
bits.cur_bit = 0;
|
|
|
|
num_blocks = Decoding::decode_egprs_acknack_bits(
|
|
&ack_nack->EGPRS_AckNack.Desc, &bits,
|
|
&bsn_begin, &bsn_end, &tbf->m_window);
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG,
|
|
"Got EGPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), "
|
|
"\"%s\"\n",
|
|
ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER,
|
|
bsn_begin, bsn_end, num_blocks,
|
|
(Decoding::extract_rbb(&bits, show_bits), show_bits)
|
|
);
|
|
|
|
rc = tbf->rcvd_dl_ack(
|
|
ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
|
|
bsn_begin, &bits);
|
|
if (rc == 1) {
|
|
tbf_free(tbf);
|
|
return;
|
|
}
|
|
|
|
/* check for channel request */
|
|
if (ack_nack->Exist_ChannelRequestDescription) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
|
|
"message, so we provide one:\n");
|
|
|
|
/* This call will register the new TBF with the MS on success */
|
|
tbf_alloc_ul(bts_data(), tbf->trx->trx_no,
|
|
tbf->ms_class(), tbf->ms()->egprs_ms_class(),
|
|
tbf->tlli(), tbf->ta(), tbf->ms());
|
|
|
|
/* schedule uplink assignment */
|
|
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
|
|
}
|
|
|
|
/* get measurements */
|
|
if (tbf->ms()) {
|
|
/* TODO: Implement Measurements parsing for EGPRS */
|
|
/*
|
|
get_meas(&meas, &ack_nack->Channel_Quality_Report);
|
|
tbf->ms()->update_l1_meas(&meas);
|
|
*/
|
|
}
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::rcv_resource_request(Packet_Resource_Request_t *request, uint32_t fn)
|
|
{
|
|
struct gprs_rlcmac_sba *sba;
|
|
|
|
if (request->ID.UnionType) {
|
|
struct gprs_rlcmac_ul_tbf *ul_tbf = NULL;
|
|
struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
|
|
uint32_t tlli = request->ID.u.TLLI;
|
|
uint8_t ms_class = 0;
|
|
uint8_t egprs_ms_class = 0;
|
|
uint8_t ta = 0;
|
|
struct pcu_l1_meas meas;
|
|
|
|
GprsMs *ms = bts()->ms_by_tlli(tlli);
|
|
/* Keep the ms, even if it gets idle temporarily */
|
|
GprsMs::Guard guard(ms);
|
|
|
|
if (ms) {
|
|
ul_tbf = ms->ul_tbf();
|
|
dl_tbf = ms->dl_tbf();
|
|
ta = ms->ta();
|
|
}
|
|
|
|
/* We got a RACH so the MS was in packet idle mode and thus
|
|
* didn't have any active TBFs */
|
|
if (ul_tbf) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
|
|
"TLLI=0x%08x while %s still "
|
|
"exists. Killing pending UL TBF\n",
|
|
tlli, tbf_name(ul_tbf));
|
|
tbf_free(ul_tbf);
|
|
ul_tbf = NULL;
|
|
}
|
|
|
|
if (dl_tbf) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
|
|
"TLLI=0x%08x while %s still exists. "
|
|
"Release pending DL TBF\n", tlli,
|
|
tbf_name(dl_tbf));
|
|
tbf_free(dl_tbf);
|
|
dl_tbf = NULL;
|
|
}
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF "
|
|
"in packet resource request of single "
|
|
"block, so we provide one:\n");
|
|
sba = bts()->sba()->find(this, fn);
|
|
if (!sba) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF "
|
|
"in packet resource request of single "
|
|
"block, but there is no resource request "
|
|
"scheduled!\n");
|
|
} else {
|
|
ta = sba->ta;
|
|
bts()->sba()->free_sba(sba);
|
|
}
|
|
if (request->Exist_MS_Radio_Access_capability) {
|
|
ms_class = Decoding::get_ms_class_by_capability(
|
|
&request->MS_Radio_Access_capability);
|
|
egprs_ms_class =
|
|
Decoding::get_egprs_ms_class_by_capability(
|
|
&request->MS_Radio_Access_capability);
|
|
}
|
|
if (!ms_class)
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n");
|
|
if (egprs_ms_class)
|
|
LOGP(DRLCMAC, LOGL_NOTICE,
|
|
"MS supports EGPRS multislot class %d.\n",
|
|
egprs_ms_class);
|
|
ul_tbf = tbf_alloc_ul(bts_data(), trx_no(), ms_class,
|
|
egprs_ms_class, tlli, ta, ms);
|
|
if (!ul_tbf)
|
|
return;
|
|
|
|
/* set control ts to current MS's TS, until assignment complete */
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts_no);
|
|
ul_tbf->control_ts = ts_no;
|
|
/* schedule uplink assignment */
|
|
ul_tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
|
|
|
|
/* get capabilities */
|
|
if (ul_tbf->ms())
|
|
ul_tbf->ms()->set_egprs_ms_class(egprs_ms_class);
|
|
|
|
/* get measurements */
|
|
if (ul_tbf->ms()) {
|
|
get_meas(&meas, request);
|
|
ul_tbf->ms()->update_l1_meas(&meas);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (request->ID.u.Global_TFI.UnionType) {
|
|
struct gprs_rlcmac_dl_tbf *dl_tbf;
|
|
int8_t tfi = request->ID.u.Global_TFI.u.DOWNLINK_TFI;
|
|
dl_tbf = bts()->dl_tbf_by_tfi(tfi, trx_no(), ts_no);
|
|
if (!dl_tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TFI=%d\n", tfi);
|
|
return;
|
|
}
|
|
LOGP(DRLCMAC, LOGL_ERROR,
|
|
"RX: [PCU <- BTS] %s FIXME: Packet resource request\n",
|
|
tbf_name(dl_tbf));
|
|
} else {
|
|
struct gprs_rlcmac_ul_tbf *ul_tbf;
|
|
int8_t tfi = request->ID.u.Global_TFI.u.UPLINK_TFI;
|
|
ul_tbf = bts()->ul_tbf_by_tfi(tfi, trx_no(), ts_no);
|
|
if (!ul_tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TFI=%d\n", tfi);
|
|
return;
|
|
}
|
|
LOGP(DRLCMAC, LOGL_ERROR,
|
|
"RX: [PCU <- BTS] %s FIXME: Packet resource request\n",
|
|
tbf_name(ul_tbf));
|
|
}
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::rcv_measurement_report(Packet_Measurement_Report_t *report, uint32_t fn)
|
|
{
|
|
struct gprs_rlcmac_sba *sba;
|
|
|
|
sba = bts()->sba()->find(this, fn);
|
|
if (!sba) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement "
|
|
"in packet resource request of single "
|
|
"block, but there is no resource request "
|
|
"scheduled! TLLI=0x%08x\n", report->TLLI);
|
|
} else {
|
|
GprsMs *ms = bts()->ms_store().get_ms(report->TLLI);
|
|
if (!ms)
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement "
|
|
"but TLLI 0x%08x is unknown\n", report->TLLI);
|
|
else
|
|
ms->set_ta(sba->ta);
|
|
|
|
bts()->sba()->free_sba(sba);
|
|
}
|
|
gprs_rlcmac_meas_rep(report);
|
|
}
|
|
|
|
/* Received Uplink RLC control block. */
|
|
int gprs_rlcmac_pdch::rcv_control_block(
|
|
bitvec *rlc_block, uint32_t fn)
|
|
{
|
|
RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
|
|
decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
|
|
LOGPC(DCSN1, LOGL_NOTICE, "\n");
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n");
|
|
switch (ul_control_block->u.MESSAGE_TYPE) {
|
|
case MT_PACKET_CONTROL_ACK:
|
|
rcv_control_ack(&ul_control_block->u.Packet_Control_Acknowledgement, fn);
|
|
break;
|
|
case MT_PACKET_DOWNLINK_ACK_NACK:
|
|
rcv_control_dl_ack_nack(&ul_control_block->u.Packet_Downlink_Ack_Nack, fn);
|
|
break;
|
|
case MT_EGPRS_PACKET_DOWNLINK_ACK_NACK:
|
|
rcv_control_egprs_dl_ack_nack(&ul_control_block->u.Egprs_Packet_Downlink_Ack_Nack, fn);
|
|
break;
|
|
case MT_PACKET_RESOURCE_REQUEST:
|
|
rcv_resource_request(&ul_control_block->u.Packet_Resource_Request, fn);
|
|
break;
|
|
case MT_PACKET_MEASUREMENT_REPORT:
|
|
rcv_measurement_report(&ul_control_block->u.Packet_Measurement_Report, fn);
|
|
break;
|
|
case MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK:
|
|
/* ignoring it. change the SI to not force sending these? */
|
|
break;
|
|
default:
|
|
bts()->decode_error();
|
|
LOGP(DRLCMAC, LOGL_NOTICE,
|
|
"RX: [PCU <- BTS] unknown control block(%d) received\n",
|
|
ul_control_block->u.MESSAGE_TYPE);
|
|
}
|
|
talloc_free(ul_control_block);
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* received RLC/MAC block from L1 */
|
|
int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn,
|
|
struct pcu_l1_meas *meas)
|
|
{
|
|
GprsCodingScheme cs = GprsCodingScheme::getBySizeUL(len);
|
|
if (!cs) {
|
|
bts()->decode_error();
|
|
LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
|
|
"length: %d)\n", len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "Got RLC block, coding scheme: %s, "
|
|
"length: %d (%d))\n", cs.name(), len, cs.usedSizeUL());
|
|
|
|
if (cs.isGprs())
|
|
return rcv_block_gprs(data, fn, meas, cs);
|
|
|
|
if (cs.isEgprs())
|
|
return rcv_data_block(data, fn, meas, cs);
|
|
|
|
bts()->decode_error();
|
|
LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n",
|
|
cs.name());
|
|
return -EINVAL;
|
|
}
|
|
|
|
int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint32_t fn,
|
|
struct pcu_l1_meas *meas, GprsCodingScheme cs)
|
|
{
|
|
int rc;
|
|
struct gprs_rlc_data_info rlc_dec;
|
|
struct gprs_rlcmac_ul_tbf *tbf;
|
|
unsigned len = cs.sizeUL();
|
|
|
|
/* These are always data blocks, since EGPRS still uses CS-1 for
|
|
* control blocks (see 44.060, section 10.3, 1st par.)
|
|
*/
|
|
if (cs.isEgprs()) {
|
|
if (!bts()->bts_data()->egprs_enabled) {
|
|
LOGP(DRLCMACUL, LOGL_ERROR,
|
|
"Got %s RLC block but EGPRS is not enabled\n",
|
|
cs.name());
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!cs.isEgprsGmsk()) {
|
|
LOGP(DRLCMACUL, LOGL_ERROR,
|
|
"Got %s RLC block but EGPRS is not implemented "
|
|
"for 8PSK yet\n",
|
|
cs.name());
|
|
bts()->decode_error();
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, " UL data: %s\n", osmo_hexdump(data, len));
|
|
|
|
rc = Decoding::rlc_parse_ul_data_header(&rlc_dec, data, cs);
|
|
if (rc < 0) {
|
|
LOGP(DRLCMACUL, LOGL_ERROR,
|
|
"Got %s RLC block but header parsing has failed\n",
|
|
cs.name());
|
|
bts()->decode_error();
|
|
return rc;
|
|
}
|
|
|
|
LOGP(DRLCMACUL, LOGL_INFO,
|
|
"Got %s RLC block: "
|
|
"R=%d, SI=%d, TFI=%d, CPS=%d, RSB=%d, "
|
|
"rc=%d\n",
|
|
cs.name(),
|
|
rlc_dec.r, rlc_dec.si, rlc_dec.tfi, rlc_dec.cps, rlc_dec.rsb,
|
|
rc);
|
|
|
|
/* find TBF inst from given TFI */
|
|
tbf = ul_tbf_by_tfi(rlc_dec.tfi);
|
|
if (!tbf) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n",
|
|
rlc_dec.tfi);
|
|
return 0;
|
|
}
|
|
|
|
return tbf->rcv_data_block_acknowledged(&rlc_dec, data, meas);
|
|
}
|
|
|
|
int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint32_t fn,
|
|
struct pcu_l1_meas *meas, GprsCodingScheme cs)
|
|
{
|
|
unsigned payload = data[0] >> 6;
|
|
bitvec *block;
|
|
int rc = 0;
|
|
unsigned len = cs.maxBytesUL();
|
|
|
|
switch (payload) {
|
|
case GPRS_RLCMAC_DATA_BLOCK:
|
|
rc = rcv_data_block(data, fn, meas, cs);
|
|
break;
|
|
case GPRS_RLCMAC_CONTROL_BLOCK:
|
|
block = bitvec_alloc(len);
|
|
if (!block)
|
|
return -ENOMEM;
|
|
bitvec_unpack(block, data);
|
|
rc = rcv_control_block(block, fn);
|
|
bitvec_free(block);
|
|
break;
|
|
case GPRS_RLCMAC_CONTROL_BLOCK_OPT:
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n");
|
|
break;
|
|
default:
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload);
|
|
rc = -EINVAL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_from_list_by_tfi(
|
|
LListHead<gprs_rlcmac_tbf> *tbf_list, uint8_t tfi,
|
|
enum gprs_rlcmac_tbf_direction dir)
|
|
{
|
|
gprs_rlcmac_tbf *tbf;
|
|
LListHead<gprs_rlcmac_tbf> *pos;
|
|
|
|
llist_for_each(pos, tbf_list) {
|
|
tbf = pos->entry();
|
|
if (tbf->tfi() != tfi)
|
|
continue;
|
|
if (!tbf->pdch[ts_no])
|
|
continue;
|
|
return tbf;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
gprs_rlcmac_ul_tbf *gprs_rlcmac_pdch::ul_tbf_by_tfi(uint8_t tfi)
|
|
{
|
|
return as_ul_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF));
|
|
}
|
|
|
|
gprs_rlcmac_dl_tbf *gprs_rlcmac_pdch::dl_tbf_by_tfi(uint8_t tfi)
|
|
{
|
|
return as_dl_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF));
|
|
}
|
|
|
|
/* lookup TBF Entity (by TFI) */
|
|
gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_by_tfi(uint8_t tfi,
|
|
enum gprs_rlcmac_tbf_direction dir)
|
|
{
|
|
struct gprs_rlcmac_tbf *tbf;
|
|
|
|
if (tfi >= 32)
|
|
return NULL;
|
|
|
|
tbf = m_tbfs[dir][tfi];
|
|
|
|
if (!tbf)
|
|
return NULL;
|
|
|
|
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)) {
|
|
return tbf;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::attach_tbf(gprs_rlcmac_tbf *tbf)
|
|
{
|
|
gprs_rlcmac_ul_tbf *ul_tbf;
|
|
|
|
if (m_tbfs[tbf->direction][tbf->tfi()])
|
|
LOGP(DRLCMAC, LOGL_ERROR, "PDCH(TS %d, TRX %d): "
|
|
"%s has not been detached, overwriting it\n",
|
|
ts_no, trx_no(),
|
|
m_tbfs[tbf->direction][tbf->tfi()]->name());
|
|
|
|
m_num_tbfs[tbf->direction] += 1;
|
|
if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
|
|
ul_tbf = as_ul_tbf(tbf);
|
|
m_assigned_usf |= 1 << ul_tbf->m_usf[ts_no];
|
|
}
|
|
m_assigned_tfi[tbf->direction] |= 1UL << tbf->tfi();
|
|
m_tbfs[tbf->direction][tbf->tfi()] = tbf;
|
|
|
|
LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Attaching %s, %d TBFs, "
|
|
"USFs = %02x, TFIs = %08x.\n",
|
|
ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction],
|
|
m_assigned_usf, m_assigned_tfi[tbf->direction]);
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::detach_tbf(gprs_rlcmac_tbf *tbf)
|
|
{
|
|
gprs_rlcmac_ul_tbf *ul_tbf;
|
|
|
|
OSMO_ASSERT(m_num_tbfs[tbf->direction] > 0);
|
|
|
|
m_num_tbfs[tbf->direction] -= 1;
|
|
if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
|
|
ul_tbf = as_ul_tbf(tbf);
|
|
m_assigned_usf &= ~(1 << ul_tbf->m_usf[ts_no]);
|
|
}
|
|
m_assigned_tfi[tbf->direction] &= ~(1UL << tbf->tfi());
|
|
m_tbfs[tbf->direction][tbf->tfi()] = NULL;
|
|
|
|
LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Detaching %s, %d TBFs, "
|
|
"USFs = %02x, TFIs = %08x.\n",
|
|
ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction],
|
|
m_assigned_usf, m_assigned_tfi[tbf->direction]);
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::reserve(enum gprs_rlcmac_tbf_direction dir)
|
|
{
|
|
m_num_reserved[dir] += 1;
|
|
}
|
|
|
|
void gprs_rlcmac_pdch::unreserve(enum gprs_rlcmac_tbf_direction dir)
|
|
{
|
|
OSMO_ASSERT(m_num_reserved[dir] > 0);
|
|
m_num_reserved[dir] -= 1;
|
|
}
|
|
|
|
void gprs_rlcmac_trx::reserve_slots(enum gprs_rlcmac_tbf_direction dir,
|
|
uint8_t slots)
|
|
{
|
|
unsigned i;
|
|
for (i = 0; i < ARRAY_SIZE(pdch); i += 1)
|
|
if (slots & (1 << i))
|
|
pdch[i].reserve(dir);
|
|
}
|
|
|
|
void gprs_rlcmac_trx::unreserve_slots(enum gprs_rlcmac_tbf_direction dir,
|
|
uint8_t slots)
|
|
{
|
|
unsigned i;
|
|
for (i = 0; i < ARRAY_SIZE(pdch); i += 1)
|
|
if (slots & (1 << i))
|
|
pdch[i].unreserve(dir);
|
|
}
|