| /* Copied from gprs_bssgp_pcu.cpp |
| * |
| * Copyright (C) 2012 Ivan Klyuchnikov |
| * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| * Copyright (C) 2013 by Holger Hans Peter Freyther |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <bts.h> |
| #include <tbf.h> |
| #include <rlc.h> |
| #include <encoding.h> |
| #include <gprs_rlcmac.h> |
| #include <gprs_debug.h> |
| #include <gprs_bssgp_pcu.h> |
| #include <decoding.h> |
| |
| extern "C" { |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/talloc.h> |
| } |
| |
| #include <errno.h> |
| #include <string.h> |
| |
| /* After sending these frames, we poll for ack/nack. */ |
| #define POLL_ACK_AFTER_FRAMES 20 |
| /* After receiving these frames, we send ack/nack. */ |
| #define SEND_ACK_AFTER_FRAMES 20 |
| |
| |
| /* If acknowledgement to downlink assignment should be polled */ |
| #define POLLING_ASSIGNMENT_DL 1 |
| #define POLLING_ASSIGNMENT_UL 1 |
| |
| static const struct gprs_rlcmac_cs gprs_rlcmac_cs[] = { |
| /* frame length data block max payload */ |
| { 0, 0, 0 }, |
| { 23, 23, 20 }, /* CS-1 */ |
| { 34, 33, 30 }, /* CS-2 */ |
| { 40, 39, 36 }, /* CS-3 */ |
| { 54, 53, 50 }, /* CS-4 */ |
| }; |
| |
| extern "C" { |
| int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| uint8_t num_frames, uint32_t num_octets); |
| } |
| |
| extern void *tall_pcu_ctx; |
| |
| static void tbf_timer_cb(void *_tbf); |
| |
| inline gprs_rlcmac_bts *gprs_rlcmac_tbf::bts_data() const |
| { |
| return bts->bts_data(); |
| } |
| |
| static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| const uint8_t ms_class) |
| { |
| if (!tbf->ms_class && ms_class) |
| tbf->ms_class = ms_class; |
| } |
| |
| void gprs_rlcmac_tbf::assign_imsi(const char *imsi) |
| { |
| strncpy(m_imsi, imsi, sizeof(m_imsi)); |
| m_imsi[sizeof(m_imsi) - 1] = '\0'; |
| } |
| |
| static struct gprs_rlcmac_tbf *tbf_lookup_dl(BTS *bts, |
| const uint32_t tlli, const char *imsi) |
| { |
| /* TODO: look up by IMSI first, then tlli, then old_tlli */ |
| return bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
| } |
| |
| static int tbf_append_data(struct gprs_rlcmac_tbf *tbf, |
| struct gprs_rlcmac_bts *bts, |
| const uint8_t ms_class, |
| const uint16_t pdu_delay_csec, |
| const uint8_t *data, const uint16_t len) |
| { |
| LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(tbf)); |
| if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
| LOGP(DRLCMAC, LOGL_DEBUG, |
| "%s in WAIT RELEASE state " |
| "(T3193), so reuse TBF\n", tbf_name(tbf)); |
| memcpy(tbf->llc_frame, data, len); |
| tbf->llc_length = len; |
| /* reset rlc states */ |
| memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); |
| /* keep to flags */ |
| tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| tbf_update_ms_class(tbf, ms_class); |
| tbf->update(); |
| tbf->bts->trigger_dl_ass(tbf, tbf, NULL); |
| } else { |
| /* the TBF exists, so we must write it in the queue |
| * we prepend lifetime in front of PDU */ |
| struct timeval *tv; |
| struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv), |
| "llc_pdu_queue"); |
| if (!llc_msg) |
| return -ENOMEM; |
| tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv)); |
| |
| uint16_t delay_csec; |
| if (bts->force_llc_lifetime) |
| delay_csec = bts->force_llc_lifetime; |
| else |
| delay_csec = pdu_delay_csec; |
| /* keep timestap at 0 for infinite delay */ |
| if (delay_csec != 0xffff) { |
| /* calculate timestamp of timeout */ |
| gettimeofday(tv, NULL); |
| tv->tv_usec += (delay_csec % 100) * 10000; |
| tv->tv_sec += delay_csec / 100; |
| if (tv->tv_usec > 999999) { |
| tv->tv_usec -= 1000000; |
| tv->tv_sec++; |
| } |
| } |
| memcpy(msgb_put(llc_msg, len), data, len); |
| msgb_enqueue(&tbf->llc_queue, llc_msg); |
| tbf_update_ms_class(tbf, ms_class); |
| } |
| |
| return 0; |
| } |
| |
| static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| const char *imsi, |
| const uint32_t tlli, const uint8_t ms_class, |
| const uint8_t *data, const uint16_t len) |
| { |
| uint8_t trx, ta, ss; |
| int8_t use_trx; |
| struct gprs_rlcmac_tbf *old_tbf, *tbf; |
| int8_t tfi; /* must be signed */ |
| int rc; |
| |
| /* check for uplink data, so we copy our informations */ |
| #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| #warning "Refactor the below lines... into a new method" |
| tbf = bts->bts->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
| if (tbf && tbf->dir.ul.contention_resolution_done |
| && !tbf->dir.ul.final_ack_sent) { |
| use_trx = tbf->trx->trx_no; |
| ta = tbf->ta; |
| ss = 0; |
| old_tbf = tbf; |
| } else { |
| use_trx = -1; |
| /* we already have an uplink TBF, so we use that TA */ |
| if (tbf) |
| ta = tbf->ta; |
| else { |
| /* recall TA */ |
| rc = bts->bts->timing_advance()->recall(tlli); |
| if (rc < 0) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown" |
| ", assuming 0\n"); |
| ta = 0; |
| } else |
| ta = rc; |
| } |
| ss = 1; /* PCH assignment only allows one timeslot */ |
| old_tbf = NULL; |
| } |
| |
| // Create new TBF (any TRX) |
| #warning "Copy and paste with alloc_ul_tbf" |
| tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_DL_TBF, &trx, use_trx); |
| if (tfi < 0) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| /* FIXME: send reject */ |
| return -EBUSY; |
| } |
| /* set number of downlink slots according to multislot class */ |
| tbf = tbf_alloc(bts, tbf, GPRS_RLCMAC_DL_TBF, tfi, trx, ms_class, ss); |
| if (!tbf) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| /* FIXME: send reject */ |
| return -EBUSY; |
| } |
| tbf->m_tlli = tlli; |
| tbf->m_tlli_valid = 1; |
| tbf->ta = ta; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(tbf)); |
| |
| /* new TBF, so put first frame */ |
| memcpy(tbf->llc_frame, data, len); |
| tbf->llc_length = len; |
| |
| /* Store IMSI for later look-up and PCH retransmission */ |
| tbf->assign_imsi(imsi); |
| |
| /* trigger downlink assignment and set state to ASSIGN. |
| * we don't use old_downlink, so the possible uplink is used |
| * to trigger downlink assignment. if there is no uplink, |
| * AGCH is used. */ |
| tbf->bts->trigger_dl_ass(tbf, old_tbf, imsi); |
| return 0; |
| } |
| |
| /** |
| * TODO: split into unit test-able parts... |
| */ |
| int tbf_handle(struct gprs_rlcmac_bts *bts, |
| const uint32_t tlli, const char *imsi, |
| const uint8_t ms_class, const uint16_t delay_csec, |
| const uint8_t *data, const uint16_t len) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| /* check for existing TBF */ |
| tbf = tbf_lookup_dl(bts->bts, tlli, imsi); |
| if (tbf) { |
| int rc = tbf_append_data(tbf, bts, ms_class, |
| delay_csec, data, len); |
| if (rc >= 0) |
| tbf->assign_imsi(imsi); |
| return rc; |
| } |
| |
| return tbf_new_dl_assignment(bts, imsi, tlli, ms_class, data, len); |
| } |
| |
| struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, |
| int8_t use_trx, uint8_t ms_class, |
| uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf) |
| { |
| uint8_t trx; |
| struct gprs_rlcmac_tbf *tbf; |
| uint8_t tfi; |
| |
| #warning "Copy and paste with tbf_new_dl_assignment" |
| /* create new TBF, use sme TRX as DL TBF */ |
| tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_UL_TBF, &trx, use_trx); |
| if (tfi < 0) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| /* FIXME: send reject */ |
| return NULL; |
| } |
| /* use multislot class of downlink TBF */ |
| tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0); |
| if (!tbf) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| /* FIXME: send reject */ |
| return NULL; |
| } |
| tbf->m_tlli = tlli; |
| tbf->m_tlli_valid = 1; /* no contention resolution */ |
| tbf->dir.ul.contention_resolution_done = 1; |
| tbf->ta = ta; /* use current TA */ |
| tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
| tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| |
| return tbf; |
| } |
| |
| static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) |
| { |
| struct gprs_rlcmac_pdch *pdch; |
| int ts; |
| |
| if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| tbf->trx->ul_tbf[tbf->tfi()] = NULL; |
| for (ts = 0; ts < 8; ts++) { |
| pdch = tbf->pdch[ts]; |
| if (pdch) |
| pdch->ul_tbf[tbf->tfi()] = NULL; |
| tbf->pdch[ts] = NULL; |
| } |
| } else { |
| tbf->trx->dl_tbf[tbf->tfi()] = NULL; |
| for (ts = 0; ts < 8; ts++) { |
| pdch = tbf->pdch[ts]; |
| if (pdch) |
| pdch->dl_tbf[tbf->tfi()] = NULL; |
| tbf->pdch[ts] = NULL; |
| } |
| } |
| } |
| |
| void tbf_free(struct gprs_rlcmac_tbf *tbf) |
| { |
| struct msgb *msg; |
| |
| /* Give final measurement report */ |
| gprs_rlcmac_rssi_rep(tbf); |
| gprs_rlcmac_lost_rep(tbf); |
| |
| debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
| debug_diagram(tbf->bts, tbf->diag, "| THE END |"); |
| debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
| LOGP(DRLCMAC, LOGL_INFO, "%s free\n", tbf_name(tbf)); |
| if (tbf->ul_ass_state != GPRS_RLCMAC_UL_ASS_NONE) |
| LOGP(DRLCMAC, LOGL_ERROR, "%s Software error: Pending uplink " |
| "assignment. This may not happen, because the " |
| "assignment message never gets transmitted. Please " |
| "be sure not to free in this state. PLEASE FIX!\n", |
| tbf_name(tbf)); |
| if (tbf->dl_ass_state != GPRS_RLCMAC_DL_ASS_NONE) |
| LOGP(DRLCMAC, LOGL_ERROR, "%s Software error: Pending downlink " |
| "assignment. This may not happen, because the " |
| "assignment message never gets transmitted. Please " |
| "be sure not to free in this state. PLEASE FIX!\n", |
| tbf_name(tbf)); |
| tbf->stop_timer(); |
| #warning "TODO: Could/Should generate bssgp_tx_llc_discarded" |
| while ((msg = msgb_dequeue(&tbf->llc_queue))) { |
| tbf->bts->dropped_frame(); |
| msgb_free(msg); |
| } |
| tbf_unlink_pdch(tbf); |
| llist_del(&tbf->list); |
| |
| if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| tbf->bts->tbf_ul_freed(); |
| else |
| tbf->bts->tbf_dl_freed(); |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF ends here **********\n"); |
| talloc_free(tbf); |
| } |
| |
| int gprs_rlcmac_tbf::update() |
| { |
| struct gprs_rlcmac_tbf *ul_tbf = NULL; |
| struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
| int rc; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF update **********\n"); |
| |
| if (direction != GPRS_RLCMAC_DL_TBF) |
| return -EINVAL; |
| |
| if (!ms_class) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Cannot update, no class\n"); |
| return -EINVAL; |
| } |
| |
| ul_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_UL_TBF); |
| |
| tbf_unlink_pdch(this); |
| rc = bts_data->alloc_algorithm(bts_data, ul_tbf, this, bts_data->alloc_algorithm_curst, 0); |
| /* if no resource */ |
| if (rc < 0) { |
| LOGP(DRLCMAC, LOGL_ERROR, "No resource after update???\n"); |
| return -rc; |
| } |
| |
| return 0; |
| } |
| |
| int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf) |
| { |
| if (tbf->control_ts == 0xff) |
| LOGP(DRLCMAC, LOGL_INFO, "- Setting Control TS %d\n", |
| tbf->first_common_ts); |
| else if (tbf->control_ts != tbf->first_common_ts) |
| LOGP(DRLCMAC, LOGL_INFO, "- Changing Control TS %d\n", |
| tbf->first_common_ts); |
| tbf->control_ts = tbf->first_common_ts; |
| |
| return 0; |
| } |
| |
| static const char *tbf_state_name[] = { |
| "NULL", |
| "ASSIGN", |
| "FLOW", |
| "FINISHED", |
| "WAIT RELEASE", |
| "RELEASING", |
| }; |
| |
| void tbf_new_state(struct gprs_rlcmac_tbf *tbf, |
| enum gprs_rlcmac_tbf_state state) |
| { |
| debug_diagram(tbf->bts, tbf->diag, "->%s", tbf_state_name[state]); |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s changes state from %s to %s\n", |
| tbf_name(tbf), |
| tbf_state_name[tbf->state], tbf_state_name[state]); |
| tbf->set_state(state); |
| } |
| |
| void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, |
| unsigned int seconds, unsigned int microseconds) |
| { |
| if (!osmo_timer_pending(&tbf->timer)) |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s starting timer %u.\n", |
| tbf_name(tbf), T); |
| else |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s restarting timer %u " |
| "while old timer %u pending \n", |
| tbf_name(tbf), T, tbf->T); |
| |
| tbf->T = T; |
| tbf->num_T_exp = 0; |
| |
| /* Tunning timers can be safely re-scheduled. */ |
| tbf->timer.data = tbf; |
| tbf->timer.cb = &tbf_timer_cb; |
| |
| osmo_timer_schedule(&tbf->timer, seconds, microseconds); |
| } |
| |
| void gprs_rlcmac_tbf::stop_t3191() |
| { |
| return stop_timer(); |
| } |
| |
| void gprs_rlcmac_tbf::stop_timer() |
| { |
| if (osmo_timer_pending(&timer)) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s stopping timer %u.\n", |
| tbf_name(this), T); |
| osmo_timer_del(&timer); |
| } |
| } |
| |
| void gprs_rlcmac_tbf::poll_timeout() |
| { |
| LOGP(DRLCMAC, LOGL_NOTICE, "%s poll timeout\n", |
| tbf_name(this)); |
| |
| poll_state = GPRS_RLCMAC_POLL_NONE; |
| |
| if (ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| } |
| ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| debug_diagram(bts, this->diag, "timeout UL-ACK"); |
| if (state_is(GPRS_RLCMAC_FINISHED)) { |
| dir.ul.n3103++; |
| if (dir.ul.n3103 == bts->bts_data()->n3103) { |
| LOGP(DRLCMAC, LOGL_NOTICE, |
| "- N3103 exceeded\n"); |
| debug_diagram(bts, diag, "N3103 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3169, bts->bts_data()->t3169, 0); |
| return; |
| } |
| /* reschedule UL ack */ |
| ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| } |
| } else if (ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET CONTROL ACK for PACKET UPLINK " |
| "ASSIGNMENT.\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| } |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| debug_diagram(bts, diag, "timeout UL-ASS"); |
| n3105++; |
| if (n3105 == bts_data()->n3105) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| debug_diagram(bts, diag, "N3105 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| return; |
| } |
| /* reschedule UL assignment */ |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| } else if (dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET CONTROL ACK for PACKET DOWNLINK " |
| "ASSIGNMENT.\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| } |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| debug_diagram(bts, diag, "timeout DL-ASS"); |
| n3105++; |
| if (n3105 == bts->bts_data()->n3105) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| debug_diagram(bts, diag, "N3105 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| return; |
| } |
| /* reschedule DL assignment */ |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| } else if (direction == GPRS_RLCMAC_DL_TBF) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET DOWNLINK ACK.\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| } |
| debug_diagram(bts, diag, "timeout DL-ACK"); |
| n3105++; |
| if (n3105 == bts->bts_data()->n3105) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| debug_diagram(bts, diag, "N3105 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| return; |
| } |
| /* resend IMM.ASS on CCCH on timeout */ |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| && !(state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| "for %s on PCH (IMSI=%s)\n", |
| tbf_name(this), |
| m_imsi); |
| /* send immediate assignment */ |
| bts->snd_dl_ass(this, 0, m_imsi); |
| dir.dl.wait_confirm = 1; |
| } |
| } else |
| LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
| } |
| |
| struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts, |
| struct gprs_rlcmac_tbf *old_tbf, enum gprs_rlcmac_tbf_direction dir, |
| uint8_t tfi, uint8_t trx, |
| uint8_t ms_class, uint8_t single_slot) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| int rc; |
| |
| #ifdef DEBUG_DIAGRAM |
| /* hunt for first free number in diagram */ |
| int diagram_num; |
| for (diagram_num = 0; ; diagram_num++) { |
| llist_for_each_entry(tbf, &bts->ul_tbfs, list) { |
| if (tbf->diag == diagram_num) |
| goto next_diagram; |
| } |
| llist_for_each_entry(tbf, &bts->dl_tbfs, list) { |
| if (tbf->diag == diagram_num) |
| goto next_diagram; |
| } |
| break; |
| next_diagram: |
| continue; |
| } |
| #endif |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n"); |
| LOGP(DRLCMAC, LOGL_INFO, "Allocating %s TBF: TFI=%d TRX=%d " |
| "MS_CLASS=%d\n", (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| tfi, trx, ms_class); |
| |
| if (trx >= 8 || tfi >= 32) |
| return NULL; |
| |
| tbf = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_tbf); |
| if (!tbf) |
| return NULL; |
| |
| tbf->bts = bts->bts; |
| #ifdef DEBUG_DIAGRAM |
| tbf->diag = diagram_num; |
| #endif |
| tbf->direction = dir; |
| tbf->m_tfi = tfi; |
| tbf->trx = &bts->trx[trx]; |
| tbf->ms_class = ms_class; |
| tbf->ws = 64; |
| tbf->sns = 128; |
| /* select algorithm */ |
| rc = bts->alloc_algorithm(bts, old_tbf, tbf, bts->alloc_algorithm_curst, |
| single_slot); |
| /* if no resource */ |
| if (rc < 0) { |
| talloc_free(tbf); |
| return NULL; |
| } |
| /* assign control ts */ |
| tbf->control_ts = 0xff; |
| rc = tbf_assign_control_ts(tbf); |
| /* if no resource */ |
| if (rc < 0) { |
| talloc_free(tbf); |
| return NULL; |
| } |
| |
| /* set timestamp */ |
| gettimeofday(&tbf->meas.dl_bw_tv, NULL); |
| gettimeofday(&tbf->meas.rssi_tv, NULL); |
| gettimeofday(&tbf->meas.dl_loss_tv, NULL); |
| |
| INIT_LLIST_HEAD(&tbf->llc_queue); |
| if (dir == GPRS_RLCMAC_UL_TBF) { |
| llist_add(&tbf->list, &bts->ul_tbfs); |
| tbf->bts->tbf_ul_created(); |
| } else { |
| llist_add(&tbf->list, &bts->dl_tbfs); |
| tbf->bts->tbf_dl_created(); |
| } |
| |
| debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
| debug_diagram(bts->bts, tbf->diag, "|NEW %s TBF TFI=%2d|", |
| (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi); |
| debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
| |
| return tbf; |
| } |
| |
| static void tbf_timer_cb(void *_tbf) |
| { |
| struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| tbf->handle_timeout(); |
| } |
| |
| void gprs_rlcmac_tbf::handle_timeout() |
| { |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s timer %u expired.\n", |
| tbf_name(this), T); |
| |
| num_T_exp++; |
| |
| switch (T) { |
| case 0: /* assignment */ |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { |
| if (state_is(GPRS_RLCMAC_ASSIGN)) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "%s releasing due to " |
| "PACCH assignment timeout.\n", tbf_name(this)); |
| tbf_free(this); |
| } else |
| LOGP(DRLCMAC, LOGL_ERROR, "Error: %s is not " |
| "in assign state\n", tbf_name(this)); |
| } |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
| /* change state to FLOW, so scheduler will start transmission */ |
| dir.dl.wait_confirm = 0; |
| if (state_is(GPRS_RLCMAC_ASSIGN)) { |
| tbf_new_state(this, GPRS_RLCMAC_FLOW); |
| tbf_assign_control_ts(this); |
| } else |
| LOGP(DRLCMAC, LOGL_NOTICE, "%s Continue flow after " |
| "IMM.ASS confirm\n", tbf_name(this)); |
| } |
| break; |
| case 3169: |
| case 3191: |
| case 3195: |
| LOGP(DRLCMAC, LOGL_NOTICE, "%s T%d timeout during " |
| "transsmission\n", tbf_name(this), T); |
| rlcmac_diag(); |
| /* fall through */ |
| case 3193: |
| if (T == 3193) |
| debug_diagram(bts, diag, "T3193 timeout"); |
| LOGP(DRLCMAC, LOGL_DEBUG, |
| "%s will be freed due to timeout\n", tbf_name(this)); |
| /* free TBF */ |
| tbf_free(this); |
| break; |
| default: |
| LOGP(DRLCMAC, LOGL_ERROR, |
| "%s timer expired in unknown mode: %u\n", tbf_name(this), T); |
| } |
| } |
| |
| int gprs_rlcmac_tbf::rlcmac_diag() |
| { |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n"); |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n"); |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n"); |
| else if (direction == GPRS_RLCMAC_UL_TBF) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n"); |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n"); |
| else if (direction == GPRS_RLCMAC_DL_TBF) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n"); |
| |
| return 0; |
| } |
| |
| struct msgb *gprs_rlcmac_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| { |
| struct msgb *msg; |
| struct timeval *tv, tv_now; |
| uint32_t octets = 0, frames = 0; |
| |
| gettimeofday(&tv_now, NULL); |
| |
| while ((msg = msgb_dequeue(&llc_queue))) { |
| tv = (struct timeval *)msg->data; |
| msgb_pull(msg, sizeof(*tv)); |
| if (tv->tv_sec /* not infinite */ |
| && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| "because lifetime limit reached\n", |
| tbf_name(this)); |
| bts->timedout_frame(); |
| frames++; |
| octets += msg->len; |
| msgb_free(msg); |
| continue; |
| } |
| break; |
| } |
| |
| if (frames) { |
| if (frames > 0xff) |
| frames = 0xff; |
| if (octets > 0xffffff) |
| octets = 0xffffff; |
| bssgp_tx_llc_discarded(bctx, m_tlli, frames, octets); |
| } |
| |
| return msg; |
| } |
| |
| void gprs_rlcmac_tbf::update_llc_frame(struct msgb *msg) |
| { |
| /* TODO: bounds check */ |
| memcpy(llc_frame, msg->data, msg->len); |
| llc_length = msg->len; |
| } |
| |
| /* |
| * Store received block data in LLC message(s) and forward to SGSN |
| * if complete. |
| */ |
| int gprs_rlcmac_tbf::assemble_forward_llc(uint8_t *data, uint8_t len) |
| { |
| struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| uint8_t e, m; |
| struct rlc_li_field *li; |
| uint8_t frame_offset[16], offset = 0, chunk; |
| int i, frames = 0; |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
| |
| data += 3; |
| len -= 3; |
| e = rh->e; /* if extended */ |
| m = 1; /* more frames, that means: the first frame */ |
| |
| /* Parse frame offsets from length indicator(s), if any. */ |
| while (1) { |
| if (frames == (int)sizeof(frame_offset)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "%s too many frames in " |
| "block\n", tbf_name(this)); |
| return -EINVAL; |
| } |
| frame_offset[frames++] = offset; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
| "%d\n", frames, offset); |
| if (!len) |
| break; |
| /* M == 0 and E == 0 is not allowed in this version. */ |
| if (!m && !e) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA " |
| "ignored, because M='0' and E='0'.\n", |
| tbf_name(this)); |
| return 0; |
| } |
| /* no more frames in this segment */ |
| if (e) { |
| break; |
| } |
| /* There is a new frame and an LI that delimits it. */ |
| if (m) { |
| li = (struct rlc_li_field *)data; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| li->li); |
| /* Special case: LI == 0 |
| * If the last segment would fit precisely into the |
| * rest of the RLC MAC block, there would be no way |
| * to delimit that this segment ends and is not |
| * continued in the next block. |
| * The special LI (0) is used to force the segment to |
| * extend into the next block, so it is delimited there. |
| * This LI must be skipped. Also it is the last LI. |
| */ |
| if (li->li == 0) { |
| data++; |
| len--; |
| m = 1; /* M is ignored, we know there is more */ |
| break; /* handle E as '1', so we break! */ |
| } |
| e = li->e; |
| m = li->m; |
| offset += li->li; |
| data++; |
| len--; |
| continue; |
| } |
| } |
| if (!m) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
| "data\n"); |
| } |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
| len); |
| /* TLLI */ |
| if (rh->ti) { |
| if (len < 4) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA TLLI out of " |
| "frame border\n", tbf_name(this)); |
| return -EINVAL; |
| } |
| data += 4; |
| len -= 4; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| "%d\n", len); |
| } |
| |
| /* PFI */ |
| if (rh->pi) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| "please disable in SYSTEM INFORMATION\n"); |
| if (len < 1) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA PFI out of " |
| "frame border\n", tbf_name(this)); |
| return -EINVAL; |
| } |
| data++; |
| len--; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
| "%d\n", len); |
| } |
| |
| /* Now we have: |
| * - a list of frames offsets: frame_offset[] |
| * - number of frames: i |
| * - m == 0: Last frame carries spare data (end of TBF). |
| */ |
| |
| /* Check if last offset would exceed frame. */ |
| if (offset > len) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA ignored, " |
| "because LI delimits data that exceeds block size.\n", |
| tbf_name(this)); |
| return -EINVAL; |
| } |
| |
| /* create LLC frames */ |
| for (i = 0; i < frames; i++) { |
| /* last frame ? */ |
| if (i == frames - 1) { |
| /* no more data in last frame */ |
| if (!m) |
| break; |
| /* data until end of frame */ |
| chunk = len - frame_offset[i]; |
| } else { |
| /* data until next frame */ |
| chunk = frame_offset[i + 1] - frame_offset[i]; |
| } |
| LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
| "frame at %d.\n", chunk, this->llc_index); |
| if (this->llc_index + chunk > LLC_MAX_LEN) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "%s LLC frame exceeds " |
| "maximum size.\n", tbf_name(this)); |
| chunk = LLC_MAX_LEN - this->llc_index; |
| } |
| memcpy(this->llc_frame + this->llc_index, data + frame_offset[i], |
| chunk); |
| this->llc_index += chunk; |
| /* not last frame. */ |
| if (i != frames - 1) { |
| /* send frame to SGSN */ |
| LOGP(DRLCMACUL, LOGL_INFO, "%s complete UL frame len=%d\n", |
| tbf_name(this) , this->llc_index); |
| snd_ul_ud(); |
| /* also check if CV==0, because the frame may fill up the |
| * block precisely, then it is also complete. normally the |
| * frame would be extended into the next block with a 0-length |
| * delimiter added to this block. */ |
| } else if (rh->cv == 0) { |
| /* send frame to SGSN */ |
| LOGP(DRLCMACUL, LOGL_INFO, "%s complete UL frame " |
| "that fits precisely in last block: " |
| "len=%d\n", tbf_name(this), this->llc_index); |
| snd_ul_ud(); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Create DL data block |
| * The messages are fragmented and forwarded as data blocks. |
| */ |
| struct msgb *gprs_rlcmac_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| { |
| struct rlc_dl_header *rh; |
| struct rlc_li_field *li; |
| uint8_t block_length; /* total length of block, including spare bits */ |
| uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| struct msgb *msg, *dl_msg; |
| uint8_t bsn; |
| uint16_t mod_sns = sns - 1; |
| uint16_t mod_sns_half = (sns >> 1) - 1; |
| uint16_t index; |
| uint8_t *delimiter, *data, *e_pointer; |
| uint8_t len; |
| uint16_t space, chunk; |
| int first_fin_ack = 0; |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| "V(S)==%d)\n", tbf_name(this), dir.dl.v_a, dir.dl.v_s); |
| |
| do_resend: |
| /* check if there is a block with negative acknowledgement */ |
| for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| bsn = (bsn + 1) & mod_sns) { |
| index = (bsn & mod_sns_half); |
| if (dir.dl.v_b[index] == 'N' |
| || dir.dl.v_b[index] == 'X') { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| bsn); |
| /* re-send block with negative aknowlegement */ |
| dir.dl.v_b[index] = 'U'; /* unacked */ |
| goto tx_block; |
| } |
| } |
| |
| /* if the window has stalled, or transfer is complete, |
| * send an unacknowledged block */ |
| if (state_is(GPRS_RLCMAC_FINISHED) |
| || ((dir.dl.v_s - dir.dl.v_a) & mod_sns) == ws) { |
| int resend = 0; |
| |
| if (state_is(GPRS_RLCMAC_FINISHED)) |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| "because all blocks have been transmitted.\n", |
| dir.dl.v_a); |
| else |
| LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| "because all window is stalled.\n", |
| dir.dl.v_a); |
| /* If V(S) == V(A) and finished state, we would have received |
| * acknowledgement of all transmitted block. In this case we |
| * would have transmitted the final block, and received ack |
| * from MS. But in this case we did not receive the final ack |
| * indication from MS. This should never happen if MS works |
| * correctly. */ |
| if (dir.dl.v_s == dir.dl.v_a) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| "so we re-transmit final block!\n"); |
| /* we just send final block again */ |
| index = ((dir.dl.v_s - 1) & mod_sns_half); |
| goto tx_block; |
| } |
| |
| /* cycle through all unacked blocks */ |
| for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| bsn = (bsn + 1) & mod_sns) { |
| index = (bsn & mod_sns_half); |
| if (dir.dl.v_b[index] == 'U') { |
| /* mark to be re-send */ |
| dir.dl.v_b[index] = 'X'; |
| resend++; |
| } |
| } |
| /* At this point there should be at leasst one unacked block |
| * to be resent. If not, this is an software error. */ |
| if (resend == 0) { |
| LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| "There are no unacknowledged blocks, but V(A) " |
| " != V(S). PLEASE FIX!\n"); |
| /* we just send final block again */ |
| index = ((dir.dl.v_s - 1) & mod_sns_half); |
| goto tx_block; |
| } |
| goto do_resend; |
| } |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| dir.dl.v_s); |
| |
| /* now we still have untransmitted LLC data, so we fill mac block */ |
| index = dir.dl.v_s & mod_sns_half; |
| data = rlc_block[index]; |
| #warning "Selection of the CS doesn't belong here" |
| if (cs == 0) { |
| cs = bts_data()->initial_cs_dl; |
| if (cs < 1 || cs > 4) |
| cs = 1; |
| } |
| block_length = gprs_rlcmac_cs[cs].block_length; |
| block_data = gprs_rlcmac_cs[cs].block_data; |
| memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| rh = (struct rlc_dl_header *)data; |
| rh->pt = 0; /* Data Block */ |
| rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| rh->usf = 7; /* will be set at scheduler */ |
| rh->pr = 0; /* FIXME: power reduction */ |
| rh->tfi = m_tfi; /* TFI */ |
| rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| rh->bsn = dir.dl.v_s; /* Block Sequence Number */ |
| rh->e = 0; /* Extension bit, maybe set later */ |
| e_pointer = data + 2; /* points to E of current chunk */ |
| data += 3; |
| delimiter = data; /* where next length header would be stored */ |
| space = block_data - 3; |
| while (1) { |
| chunk = llc_length - llc_index; |
| /* if chunk will exceed block limit */ |
| if (chunk > space) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "larger than space (%d) left in block: copy " |
| "only remaining space, and we are done\n", |
| chunk, space); |
| /* block is filled, so there is no extension */ |
| *e_pointer |= 0x01; |
| /* fill only space */ |
| memcpy(data, llc_frame + llc_index, space); |
| /* incement index */ |
| llc_index += space; |
| /* return data block as message */ |
| break; |
| } |
| /* if FINAL chunk would fit precisely in space left */ |
| if (chunk == space && llist_empty(&llc_queue)) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "would exactly fit into space (%d): because " |
| "this is a final block, we don't add length " |
| "header, and we are done\n", chunk, space); |
| LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| "%s that fits precisely in last block: " |
| "len=%d\n", tbf_name(this), llc_length); |
| gprs_rlcmac_dl_bw(this, llc_length); |
| /* block is filled, so there is no extension */ |
| *e_pointer |= 0x01; |
| /* fill space */ |
| memcpy(data, llc_frame + llc_index, space); |
| /* reset LLC frame */ |
| llc_index = llc_length = 0; |
| /* final block */ |
| rh->fbi = 1; /* we indicate final block */ |
| tbf_new_state(this, GPRS_RLCMAC_FINISHED); |
| /* return data block as message */ |
| break; |
| } |
| /* if chunk would fit exactly in space left */ |
| if (chunk == space) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "would exactly fit into space (%d): add length " |
| "header with LI=0, to make frame extend to " |
| "next block, and we are done\n", chunk, space); |
| /* make space for delimiter */ |
| if (delimiter != data) |
| memcpy(delimiter + 1, delimiter, |
| data - delimiter); |
| data++; |
| space--; |
| /* add LI with 0 length */ |
| li = (struct rlc_li_field *)delimiter; |
| li->e = 1; /* not more extension */ |
| li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| li->li = 0; /* chunk fills the complete space */ |
| // no need to set e_pointer nor increase delimiter |
| /* fill only space, which is 1 octet less than chunk */ |
| memcpy(data, llc_frame + llc_index, space); |
| /* incement index */ |
| llc_index += space; |
| /* return data block as message */ |
| break; |
| } |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| "than remaining space (%d): add length header to " |
| "to delimit LLC frame\n", chunk, space); |
| /* the LLC frame chunk ends in this block */ |
| /* make space for delimiter */ |
| if (delimiter != data) |
| memcpy(delimiter + 1, delimiter, data - delimiter); |
| data++; |
| space--; |
| /* add LI to delimit frame */ |
| li = (struct rlc_li_field *)delimiter; |
| li->e = 0; /* Extension bit, maybe set later */ |
| li->m = 0; /* will be set later, if there is more LLC data */ |
| li->li = chunk; /* length of chunk */ |
| e_pointer = delimiter; /* points to E of current delimiter */ |
| delimiter++; |
| /* copy (rest of) LLC frame to space */ |
| memcpy(data, llc_frame + llc_index, chunk); |
| data += chunk; |
| space -= chunk; |
| LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
| "len=%d\n", tbf_name(this), llc_length); |
| gprs_rlcmac_dl_bw(this, llc_length); |
| /* reset LLC frame */ |
| llc_index = llc_length = 0; |
| /* dequeue next LLC frame, if any */ |
| msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| if (msg) { |
| LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| "%s (len=%d)\n", tbf_name(this), msg->len); |
| update_llc_frame(msg); |
| msgb_free(msg); |
| } |
| /* if we have more data and we have space left */ |
| if (space > 0 && llc_length) { |
| li->m = 1; /* we indicate more frames to follow */ |
| continue; |
| } |
| /* if we don't have more LLC frames */ |
| if (!llc_length) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| "done.\n"); |
| li->e = 1; /* we cannot extend */ |
| rh->fbi = 1; /* we indicate final block */ |
| first_fin_ack = 1; |
| /* + 1 indicates: first final ack */ |
| tbf_new_state(this, GPRS_RLCMAC_FINISHED); |
| break; |
| } |
| /* we have no space left */ |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| "done.\n"); |
| li->e = 1; /* we cannot extend */ |
| break; |
| } |
| LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| osmo_hexdump(rlc_block[index], block_length)); |
| rlc_block_len[index] = block_length; |
| /* raise send state and set ack state array */ |
| dir.dl.v_b[index] = 'U'; /* unacked */ |
| dir.dl.v_s = (dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| |
| tx_block: |
| /* from this point on, new block is sent or old block is resent */ |
| |
| /* get data and header from current block */ |
| data = rlc_block[index]; |
| len = rlc_block_len[index]; |
| rh = (struct rlc_dl_header *)data; |
| |
| /* Clear Polling, if still set in history buffer */ |
| rh->s_p = 0; |
| |
| /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| */ |
| if (dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| if (first_fin_ack) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| "polling, because first final block sent.\n"); |
| } else { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| "polling, because %d blocks sent.\n", |
| POLL_ACK_AFTER_FRAMES); |
| } |
| /* scheduling not possible, because: */ |
| if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
| "sheduled for %s, so we must wait for " |
| "requesting downlink ack\n", tbf_name(this)); |
| else if (control_ts != ts) |
| LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| "sheduled in this TS %d, waiting for " |
| "TS %d\n", ts, control_ts); |
| else if (bts->sba()->find(trx->trx_no, ts, (fn + 13) % 2715648)) |
| LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| "sheduled, because single block alllocation " |
| "already exists\n"); |
| else { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| "TS %d\n", ts); |
| dir.dl.tx_counter = 0; |
| /* start timer whenever we send the final block */ |
| if (rh->fbi == 1) |
| tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| |
| /* schedule polling */ |
| poll_state = GPRS_RLCMAC_POLL_SCHED; |
| poll_fn = (fn + 13) % 2715648; |
| |
| #ifdef DEBUG_DIAGRAM |
| debug_diagram(bts, diag, "poll DL-ACK"); |
| if (first_fin_ack) |
| debug_diagram(bts, diag, "(is first FINAL)"); |
| if (rh->fbi) |
| debug_diagram(bts, diag, "(FBI is set)"); |
| #endif |
| |
| /* set polling in header */ |
| rh->rrbp = 0; /* N+13 */ |
| rh->s_p = 1; /* Polling */ |
| |
| /* Increment TX-counter */ |
| dir.dl.tx_counter++; |
| } |
| } else { |
| /* Increment TX-counter */ |
| dir.dl.tx_counter++; |
| } |
| |
| /* return data block as message */ |
| dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| if (!dl_msg) |
| return NULL; |
| memcpy(msgb_put(dl_msg, len), data, len); |
| |
| return dl_msg; |
| } |
| |
| struct msgb *gprs_rlcmac_tbf::create_dl_ass(uint32_t fn) |
| { |
| struct msgb *msg; |
| struct gprs_rlcmac_tbf *new_tbf; |
| int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
| |
| if (poll_ass_dl && direction == GPRS_RLCMAC_DL_TBF |
| && control_ts != first_common_ts) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
| "assigment, because MS cannot reply. (control TS=%d, " |
| "first common TS=%d)\n", control_ts, |
| first_common_ts); |
| poll_ass_dl = 0; |
| } |
| if (poll_ass_dl) { |
| if (poll_state != GPRS_RLCMAC_POLL_NONE) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
| "for %s, so we must wait for downlink " |
| "assignment...\n", tbf_name(this)); |
| return NULL; |
| } |
| if (bts->sba()->find(trx->trx_no, control_ts, (fn + 13) % 2715648)) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| "scheduled for single block allocation...\n"); |
| return NULL; |
| } |
| } |
| |
| /* on uplink TBF we get the downlink TBF to be assigned. */ |
| if (direction == GPRS_RLCMAC_UL_TBF) { |
| /* be sure to check first, if contention resolution is done, |
| * otherwise we cannot send the assignment yet */ |
| if (!dir.ul.contention_resolution_done) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
| "because contention resolution is not " |
| "finished.\n"); |
| return NULL; |
| } |
| #warning "THIS should probably go over the IMSI too" |
| new_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_DL_TBF); |
| } else |
| new_tbf = this; |
| if (!new_tbf) { |
| LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| "assignment at uplink %s, but there is no downlink " |
| "TBF\n", tbf_name(this)); |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| return NULL; |
| } |
| |
| msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| if (!msg) |
| return NULL; |
| bitvec *ass_vec = bitvec_alloc(23); |
| if (!ass_vec) { |
| msgb_free(msg); |
| return NULL; |
| } |
| bitvec_unhex(ass_vec, |
| "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| LOGP(DRLCMAC, LOGL_INFO, "%s start Packet Downlink Assignment (PACCH)\n", tbf_name(new_tbf)); |
| RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
| Encoding::write_packet_downlink_assignment(mac_control_block, m_tfi, |
| (direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
| poll_ass_dl, bts_data()->alpha, bts_data()->gamma, -1, 0); |
| LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
| encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
| bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| bitvec_free(ass_vec); |
| talloc_free(mac_control_block); |
| |
| if (poll_ass_dl) { |
| poll_state = GPRS_RLCMAC_POLL_SCHED; |
| poll_fn = (fn + 13) % 2715648; |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| } else { |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| tbf_assign_control_ts(new_tbf); |
| /* stop pending assignment timer */ |
| new_tbf->stop_timer(); |
| |
| } |
| debug_diagram(bts, diag, "send DL-ASS"); |
| |
| return msg; |
| } |
| |
| struct msgb *gprs_rlcmac_tbf::create_ul_ass(uint32_t fn) |
| { |
| struct msgb *msg; |
| struct gprs_rlcmac_tbf *new_tbf; |
| |
| #if POLLING_ASSIGNMENT_UL == 1 |
| if (poll_state != GPRS_RLCMAC_POLL_NONE) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| "sheduled for %s, so we must wait for uplink " |
| "assignment...\n", tbf_name(this)); |
| return NULL; |
| } |
| if (bts->sba()->find(trx->trx_no, control_ts, (fn + 13) % 2715648)) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| "single block allocation...\n"); |
| return NULL; |
| } |
| #endif |
| |
| /* on down TBF we get the uplink TBF to be assigned. */ |
| #warning "Probably want to find by IMSI too" |
| if (direction == GPRS_RLCMAC_DL_TBF) |
| new_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_UL_TBF); |
| else |
| new_tbf = this; |
| |
| if (!new_tbf) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| "assignment at downlink %s, but there is no uplink " |
| "TBF\n", tbf_name(this)); |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| return NULL; |
| } |
| |
| msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| if (!msg) |
| return NULL; |
| LOGP(DRLCMAC, LOGL_INFO, "%ss start Packet Uplink Assignment (PACCH)\n", tbf_name(new_tbf)); |
| bitvec *ass_vec = bitvec_alloc(23); |
| if (!ass_vec) { |
| msgb_free(msg); |
| return NULL; |
| } |
| bitvec_unhex(ass_vec, |
| "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| Encoding::write_packet_uplink_assignment(bts_data(), ass_vec, m_tfi, |
| (direction == GPRS_RLCMAC_DL_TBF), m_tlli, |
| m_tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts_data()->alpha, |
| bts_data()->gamma, -1); |
| bitvec_pack(ass_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 Uplink Assignment +++++++++++++++++++++++++\n"); |
| decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
| bitvec_free(ass_vec); |
| talloc_free(mac_control_block); |
| |
| #if POLLING_ASSIGNMENT_UL == 1 |
| poll_state = GPRS_RLCMAC_POLL_SCHED; |
| poll_fn = (fn + 13) % 2715648; |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| #else |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| tbf_assign_control_ts(new_tbf); |
| #endif |
| debug_diagram(bts, diag, "send UL-ASS"); |
| |
| return msg; |
| } |
| |
| struct msgb *gprs_rlcmac_tbf::create_ul_ack(uint32_t fn) |
| { |
| int final = (state_is(GPRS_RLCMAC_FINISHED)); |
| struct msgb *msg; |
| |
| if (final) { |
| if (poll_state != GPRS_RLCMAC_POLL_NONE) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| "sheduled for %s, so we must wait for " |
| "final uplink ack...\n", tbf_name(this)); |
| return NULL; |
| } |
| if (bts->sba()->find(trx->trx_no, control_ts, (fn + 13) % 2715648)) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| "scheduled for single block allocation...\n"); |
| return NULL; |
| } |
| } |
| |
| msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| if (!msg) |
| return NULL; |
| bitvec *ack_vec = bitvec_alloc(23); |
| if (!ack_vec) { |
| msgb_free(msg); |
| return NULL; |
| } |
| bitvec_unhex(ack_vec, |
| "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
| Encoding::write_packet_uplink_ack(bts_data(), mac_control_block, this, final); |
| encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
| bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| bitvec_free(ack_vec); |
| talloc_free(mac_control_block); |
| |
| /* now we must set this flag, so we are allowed to assign downlink |
| * TBF on PACCH. it is only allowed when TLLI is acknowledged. */ |
| dir.ul.contention_resolution_done = 1; |
| |
| if (final) { |
| poll_state = GPRS_RLCMAC_POLL_SCHED; |
| poll_fn = (fn + 13) % 2715648; |
| /* waiting for final acknowledge */ |
| ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
| dir.ul.final_ack_sent = 1; |
| } else |
| ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| debug_diagram(bts->bts, diag, "send UL-ACK"); |
| |
| return msg; |
| } |
| |
| int gprs_rlcmac_tbf::snd_dl_ack(uint8_t final, uint8_t ssn, uint8_t *rbb) |
| { |
| char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| uint16_t mod_sns = sns - 1; |
| uint16_t mod_sns_half = (sns >> 1) - 1; |
| int i; /* must be signed */ |
| int16_t dist; /* must be signed */ |
| uint8_t bit; |
| uint16_t bsn; |
| struct msgb *msg; |
| uint16_t lost = 0, received = 0; |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| |
| if (!final) { |
| /* show received array in debug (bit 64..1) */ |
| for (i = 63; i >= 0; i--) { |
| bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| show_rbb[i] = (bit) ? '1' : 'o'; |
| } |
| show_rbb[64] = '\0'; |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| show_rbb, (ssn - 1) & mod_sns); |
| |
| /* apply received array to receive state (SSN-64..SSN-1) */ |
| /* calculate distance of ssn from V(S) */ |
| dist = (dir.dl.v_s - ssn) & mod_sns; |
| /* check if distance is less than distance V(A)..V(S) */ |
| if (dist >= ((dir.dl.v_s - dir.dl.v_a) & mod_sns)) { |
| /* this might happpen, if the downlink assignment |
| * was not received by ms and the ack refers |
| * to previous TBF |
| * FIXME: we should implement polling for |
| * control ack!*/ |
| LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| return 1; /* indicate to free TBF */ |
| } |
| /* SSN - 1 is in range V(A)..V(S)-1 */ |
| for (i = 63, bsn = (ssn - 1) & mod_sns; |
| i >= 0 && bsn != ((dir.dl.v_a - 1) & mod_sns); |
| i--, bsn = (bsn - 1) & mod_sns) { |
| bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| if (bit) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| "ack for BSN=%d\n", bsn); |
| if (dir.dl.v_b[bsn & mod_sns_half] |
| != 'A') |
| received++; |
| dir.dl.v_b[bsn & mod_sns_half] = 'A'; |
| } else { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| "NACK for BSN=%d\n", bsn); |
| dir.dl.v_b[bsn & mod_sns_half] = 'N'; |
| lost++; |
| } |
| } |
| /* report lost and received packets */ |
| gprs_rlcmac_received_lost(this, received, lost); |
| |
| /* raise V(A), if possible */ |
| for (i = 0, bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| i++, bsn = (bsn + 1) & mod_sns) { |
| if (dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| /* mark invalid */ |
| dir.dl.v_a = (dir.dl.v_a + 1) |
| & mod_sns; |
| } else |
| break; |
| } |
| |
| /* show receive state array in debug (V(A)..V(S)-1) */ |
| for (i = 0, bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| i++, bsn = (bsn + 1) & mod_sns) { |
| show_v_b[i] = dir.dl.v_b[bsn & mod_sns_half]; |
| if (show_v_b[i] == 0) |
| show_v_b[i] = ' '; |
| } |
| show_v_b[i] = '\0'; |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| "X=Resend-Unacked\n", dir.dl.v_a, show_v_b, |
| (dir.dl.v_s - 1) & mod_sns); |
| |
| if (state_is(GPRS_RLCMAC_FINISHED) |
| && dir.dl.v_s == dir.dl.v_a) { |
| LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| "all blocks, but without final ack " |
| "inidcation (don't worry)\n"); |
| } |
| return 0; |
| } |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| debug_diagram(ts, diag, "got Final ACK"); |
| /* range V(A)..V(S)-1 */ |
| for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| bsn = (bsn + 1) & mod_sns) { |
| if (dir.dl.v_b[bsn & mod_sns_half] != 'A') |
| received++; |
| } |
| |
| /* report all outstanding packets as received */ |
| gprs_rlcmac_received_lost(this, received, lost); |
| |
| /* check for LLC PDU in the LLC Queue */ |
| msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| if (!msg) { |
| /* no message, start T3193, change state to RELEASE */ |
| LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| "release.\n"); |
| /* start T3193 */ |
| debug_diagram(bts, diag, "start T3193"); |
| tbf_timer_start(this, 3193, |
| bts_data()->t3193_msec / 1000, |
| (bts_data()->t3193_msec % 1000) * 1000); |
| tbf_new_state(this, GPRS_RLCMAC_WAIT_RELEASE); |
| |
| return 0; |
| } |
| #warning "Copy and paste on the sender path" |
| update_llc_frame(msg); |
| msgb_free(msg); |
| |
| /* we have a message, so we trigger downlink assignment, and there |
| * set the state to ASSIGN. also we set old_downlink, because we |
| * re-use this tbf. */ |
| LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| "because another LLC PDU has arrived in between\n"); |
| memset(&dir.dl, 0, sizeof(dir.dl)); /* reset RLC states */ |
| state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| update(); |
| bts->trigger_dl_ass(this, this, NULL); |
| return 0; |
| } |
| |
| void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) |
| { |
| for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| tbf = trx->ul_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| tbf = trx->dl_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| } |
| } |
| |
| void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_pdch *pdch) |
| { |
| for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| tbf = pdch->ul_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| tbf = pdch->dl_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| } |
| } |
| |
| void gprs_rlcmac_tbf::tlli_mark_valid() |
| { |
| m_tlli_valid = true; |
| } |
| |
| void gprs_rlcmac_tbf::update_tlli(uint32_t tlli) |
| { |
| if (tlli == m_tlli) |
| return; |
| |
| bool changedUl = false; |
| |
| /* |
| * During a Routing Area Update (due the assignment of a new |
| * P-TMSI) the tlli can change. We notice this when receiving |
| * a PACKET CONTROL ACK. |
| * When we get a TLLI change on the DL we will look if there |
| * is a UL TBF and change the tlli there as well. |
| * |
| * TODO: There could be multiple DL and UL TBFs and we should |
| * have a proper way to link all the related TBFs so we can do |
| * a group update. |
| */ |
| if (m_tlli_valid && direction == GPRS_RLCMAC_DL_TBF) { |
| gprs_rlcmac_tbf *ul_tbf; |
| ul_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_UL_TBF); |
| |
| if (ul_tbf) { |
| ul_tbf->m_tlli = tlli; |
| changedUl = true; |
| } |
| } |
| |
| /* update the timing advance for the new tlli */ |
| bts->timing_advance()->update(m_tlli, tlli, ta); |
| |
| LOGP(DRLCMAC, LOGL_NOTICE, |
| "%s changing tlli from TLLI=0x%08x TLLI=0x%08x ul_changed=%d\n", |
| tbf_name(this), m_tlli, tlli, changedUl); |
| m_tlli = tlli; |
| } |
| |
| int gprs_rlcmac_tbf::rcv_data_block_acknowledged(const uint8_t *data, size_t len, int8_t rssi) |
| { |
| uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| int rc; |
| |
| this->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TFI=%d received (V(Q)=%d .. " |
| "V(R)=%d)\n", rh->tfi, this->dir.ul.v_q, this->dir.ul.v_r); |
| |
| /* process RSSI */ |
| gprs_rlcmac_rssi(this, rssi); |
| |
| /* get TLLI */ |
| if (!this->is_tlli_valid()) { |
| struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; |
| uint32_t tlli; |
| |
| /* no TLLI yet */ |
| if (!rh->ti) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d without " |
| "TLLI, but no TLLI received yet\n", rh->tfi); |
| return 0; |
| } |
| rc = Decoding::tlli_from_ul_data(data, len, &tlli); |
| if (rc) { |
| bts->decode_error(); |
| LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
| "of UL DATA TFI=%d.\n", rh->tfi); |
| return 0; |
| } |
| this->update_tlli(tlli); |
| LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| "UL DATA TFI=%d.\n", this->tlli(), rh->tfi); |
| if ((dl_tbf = bts->tbf_by_tlli(this->tlli(), GPRS_RLCMAC_DL_TBF))) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| "TLLI=0x%08x while %s still exists. " |
| "Killing pending DL TBF\n", this->tlli(), |
| tbf_name(dl_tbf)); |
| tbf_free(dl_tbf); |
| } |
| /* tbf_by_tlli will not find your TLLI, because it is not |
| * yet marked valid */ |
| if ((ul_tbf = bts->tbf_by_tlli(this->tlli(), GPRS_RLCMAC_UL_TBF))) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| "TLLI=0x%08x while %s still exists. " |
| "Killing pending UL TBF\n", this->tlli(), |
| tbf_name(ul_tbf)); |
| tbf_free(ul_tbf); |
| } |
| /* mark TLLI valid now */ |
| this->tlli_mark_valid(); |
| /* store current timing advance */ |
| bts->timing_advance()->remember(this->tlli(), this->ta); |
| /* already have TLLI, but we stille get another one */ |
| } else if (rh->ti) { |
| uint32_t tlli; |
| rc = Decoding::tlli_from_ul_data(data, len, &tlli); |
| if (rc) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
| "of UL DATA TFI=%d.\n", rh->tfi); |
| return 0; |
| } |
| if (tlli != this->tlli()) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
| "DATA TFI=%d. (Ignoring due to contention " |
| "resolution)\n", rh->tfi); |
| return 0; |
| } |
| } |
| |
| mod_sns = this->sns - 1; |
| mod_sns_half = (this->sns >> 1) - 1; |
| |
| /* restart T3169 */ |
| tbf_timer_start(this, 3169, bts_data()->t3169, 0); |
| |
| /* Increment RX-counter */ |
| this->dir.ul.rx_counter++; |
| |
| /* current block relative to lowest unreceived block */ |
| offset_v_q = (rh->bsn - this->dir.ul.v_q) & mod_sns; |
| /* If out of window (may happen if blocks below V(Q) are received |
| * again. */ |
| if (offset_v_q >= this->ws) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
| "%d..%d (it's normal)\n", rh->bsn, this->dir.ul.v_q, |
| (this->dir.ul.v_q + this->ws - 1) & mod_sns); |
| return 0; |
| } |
| /* Write block to buffer and set receive state array. */ |
| index = rh->bsn & mod_sns_half; /* memory index of block */ |
| memcpy(this->rlc_block[index], data, len); /* Copy block. */ |
| this->rlc_block_len[index] = len; |
| this->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
| rh->bsn, this->dir.ul.v_q, |
| (this->dir.ul.v_q + this->ws - 1) & mod_sns); |
| /* Raise V(R) to highest received sequence number not received. */ |
| offset_v_r = (rh->bsn + 1 - this->dir.ul.v_r) & mod_sns; |
| if (offset_v_r < (this->sns >> 1)) { /* Positive offset, so raise. */ |
| while (offset_v_r--) { |
| if (offset_v_r) /* all except the received block */ |
| this->dir.ul.v_n[this->dir.ul.v_r & mod_sns_half] |
| = 'N'; /* Mark block as not received */ |
| this->dir.ul.v_r = (this->dir.ul.v_r + 1) & mod_sns; |
| /* Inc V(R). */ |
| } |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
| this->dir.ul.v_r); |
| } |
| |
| #warning "Move to TBF and remove the index side effect.." |
| /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| * This is looped until there is a gap (non received block) or |
| * the window is empty.*/ |
| while (this->dir.ul.v_q != this->dir.ul.v_r && this->dir.ul.v_n[ |
| (index = this->dir.ul.v_q & mod_sns_half)] == 'R') { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
| "V(Q) to %d\n", this->dir.ul.v_q, |
| (this->dir.ul.v_q + 1) & mod_sns); |
| /* get LLC data from block */ |
| this->assemble_forward_llc(this->rlc_block[index], this->rlc_block_len[index]); |
| /* raise V(Q), because block already received */ |
| this->dir.ul.v_q = (this->dir.ul.v_q + 1) & mod_sns; |
| } |
| |
| /* Check CV of last frame in buffer */ |
| if (this->state_is(GPRS_RLCMAC_FLOW) /* still in flow state */ |
| && this->dir.ul.v_q == this->dir.ul.v_r) { /* if complete */ |
| struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
| this->rlc_block[(this->dir.ul.v_r - 1) & mod_sns_half]; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
| "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| last_rh->cv); |
| if (last_rh->cv == 0) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
| "TBF\n"); |
| tbf_new_state(this, GPRS_RLCMAC_FINISHED); |
| /* Reset N3103 counter. */ |
| this->dir.ul.n3103 = 0; |
| } |
| } |
| |
| /* If TLLI is included or if we received half of the window, we send |
| * an ack/nack */ |
| if (rh->si || rh->ti || this->state_is(GPRS_RLCMAC_FINISHED) |
| || (this->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
| if (rh->si) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
| "because MS is stalled.\n"); |
| } |
| if (rh->ti) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| "because TLLI is included.\n"); |
| } |
| if (this->state_is(GPRS_RLCMAC_FINISHED)) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| "because last block has CV==0.\n"); |
| } |
| if ((this->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| "because %d frames received.\n", |
| SEND_ACK_AFTER_FRAMES); |
| } |
| if (this->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| #ifdef DEBUG_DIAGRAM |
| if (rh->si) |
| debug_diagram(bts->bts, this->diag, "sched UL-ACK stall"); |
| if (rh->ti) |
| debug_diagram(bts->bts, this->diag, "sched UL-ACK TLLI"); |
| if (this->state_is(GPRS_RLCMAC_FINISHED)) |
| debug_diagram(bts->bts, this->diag, "sched UL-ACK CV==0"); |
| if ((this->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) |
| debug_diagram(bts->bts, this->diag, "sched UL-ACK n=%d", |
| this->dir.ul.rx_counter); |
| #endif |
| /* trigger sending at next RTS */ |
| this->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| } else { |
| /* already triggered */ |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| "already triggered, don't schedule!\n"); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Send Uplink unit-data to SGSN. */ |
| int gprs_rlcmac_tbf::snd_ul_ud() |
| { |
| uint8_t qos_profile[3]; |
| struct msgb *llc_pdu; |
| unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + llc_index; |
| struct bssgp_bvc_ctx *bctx = gprs_bssgp_pcu_current_bctx(); |
| |
| LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] %s len=%d\n", tbf_name(this), llc_index); |
| if (!bctx) { |
| LOGP(DBSSGP, LOGL_ERROR, "No bctx\n"); |
| llc_index = 0; /* reset frame space */ |
| return -EIO; |
| } |
| |
| llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu"); |
| uint8_t *buf = msgb_push(llc_pdu, TL16V_GROSS_LEN(sizeof(uint8_t)*llc_index)); |
| tl16v_put(buf, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*llc_index, llc_frame); |
| qos_profile[0] = QOS_PROFILE >> 16; |
| qos_profile[1] = QOS_PROFILE >> 8; |
| qos_profile[2] = QOS_PROFILE; |
| bssgp_tx_ul_ud(bctx, tlli(), qos_profile, llc_pdu); |
| |
| llc_index = 0; /* reset frame space */ |
| return 0; |
| } |
| |
| const char *tbf_name(gprs_rlcmac_tbf *tbf) |
| { |
| static char buf[40]; |
| snprintf(buf, sizeof(buf), "TBF(TFI=%d TLLI=0x%08x DIR=%s)", |
| tbf->m_tfi, tbf->m_tlli, |
| tbf->direction == GPRS_RLCMAC_UL_TBF ? "UL" : "DL"); |
| buf[sizeof(buf) - 1] = '\0'; |
| return buf; |
| } |