diff options
Diffstat (limited to 'src/tbf.cpp')
| -rw-r--r-- | src/tbf.cpp | 1632 |
1 files changed, 1383 insertions, 249 deletions
diff --git a/src/tbf.cpp b/src/tbf.cpp index 547612f6..d6b38022 100644 --- a/src/tbf.cpp +++ b/src/tbf.cpp @@ -19,9 +19,14 @@ * 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> @@ -31,8 +36,35 @@ extern "C" { #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 + + +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) { @@ -40,67 +72,45 @@ static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, tbf->ms_class = ms_class; } -static inline void tbf_assign_imsi(struct gprs_rlcmac_tbf *tbf, - const char *imsi) +void gprs_rlcmac_tbf::assign_imsi(const char *imsi) { - strncpy(tbf->meas.imsi, imsi, sizeof(tbf->meas.imsi) - 1); + strncpy(m_imsi, imsi, sizeof(m_imsi)); + m_imsi[sizeof(m_imsi) - 1] = '\0'; } -static struct gprs_rlcmac_tbf *tbf_lookup_dl(const uint32_t tlli, const char *imsi) +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 tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); + 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, +int gprs_rlcmac_tbf::append_data(const uint8_t ms_class, const uint16_t pdu_delay_csec, const uint8_t *data, const uint16_t len) { - LOGP(DRLCMAC, LOGL_INFO, "TBF: APPEND TFI: %u TLLI: 0x%08x\n", tbf->tfi, tbf->tlli); - if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE)) { - LOGP(DRLCMAC, LOGL_DEBUG, "TBF in WAIT RELEASE state " - "(T3193), so reuse TBF\n"); - 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); - gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); + LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(this)); + if (state_is(GPRS_RLCMAC_WAIT_RELEASE)) { + LOGP(DRLCMAC, LOGL_DEBUG, + "%s in WAIT RELEASE state " + "(T3193), so reuse TBF\n", tbf_name(this)); + tbf_update_ms_class(this, ms_class); + reuse_tbf(data, len); } 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), + struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv) * 2, "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++; - } - } + gprs_llc::calc_pdu_lifetime(bts, pdu_delay_csec, tv); + tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv)); + gettimeofday(tv, NULL); memcpy(msgb_put(llc_msg, len), data, len); - msgb_enqueue(&tbf->llc_queue, llc_msg); - tbf_update_ms_class(tbf, ms_class); + m_llc.enqueue(llc_msg); + tbf_update_ms_class(this, ms_class); } return 0; @@ -120,10 +130,10 @@ static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, /* 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 = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); + 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; + use_trx = tbf->trx->trx_no; ta = tbf->ta; ss = 0; old_tbf = tbf; @@ -134,7 +144,7 @@ static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, ta = tbf->ta; else { /* recall TA */ - rc = recall_timing_advance(tlli); + rc = bts->bts->timing_advance()->recall(tlli); if (rc < 0) { LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown" ", assuming 0\n"); @@ -148,7 +158,7 @@ static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, // Create new TBF (any TRX) #warning "Copy and paste with alloc_ul_tbf" - tfi = tfi_find_free(bts, GPRS_RLCMAC_DL_TBF, &trx, use_trx); + 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 */ @@ -157,37 +167,35 @@ static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, /* 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 ressource\n"); + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); /* FIXME: send reject */ return -EBUSY; } - tbf->tlli = tlli; - tbf->tlli_valid = 1; + tbf->m_tlli = tlli; + tbf->m_tlli_valid = 1; tbf->ta = ta; - LOGP(DRLCMAC, LOGL_DEBUG, - "TBF: [DOWNLINK] START TFI: %d TLLI: 0x%08x \n", - tbf->tfi, tbf->tlli); + 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; + tbf->m_llc.put_frame(data, len); + tbf->bts->llc_frame_sched(); + + /* 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. */ - gprs_rlcmac_trigger_downlink_assignment(tbf, old_tbf, imsi); - - /* store IMSI for debugging purpose. TODO: it is more than debugging */ - tbf_assign_imsi(tbf, imsi); + 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, +int gprs_rlcmac_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) @@ -195,12 +203,11 @@ int tbf_handle(struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_tbf *tbf; /* check for existing TBF */ - tbf = tbf_lookup_dl(tlli, imsi); + tbf = tbf_lookup_dl(bts->bts, tlli, imsi); if (tbf) { - int rc = tbf_append_data(tbf, bts, ms_class, - delay_csec, data, len); + int rc = tbf->append_data(ms_class, delay_csec, data, len); if (rc >= 0) - tbf_assign_imsi(tbf, imsi); + tbf->assign_imsi(imsi); return rc; } @@ -213,25 +220,25 @@ struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, { uint8_t trx; struct gprs_rlcmac_tbf *tbf; - uint8_t tfi; + int8_t tfi; /* must be signed */ #warning "Copy and paste with tbf_new_dl_assignment" - /* create new TBF, use sme TRX as DL TBF */ - tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, use_trx); + /* create new TBF, use same 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 ressource\n"); + 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 ressource\n"); + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); /* FIXME: send reject */ return NULL; } - tbf->tlli = tlli; - tbf->tlli_valid = 1; /* no contention resolution */ + 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); @@ -243,24 +250,23 @@ struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) { - struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; struct gprs_rlcmac_pdch *pdch; int ts; if (tbf->direction == GPRS_RLCMAC_UL_TBF) { - bts->trx[tbf->trx].ul_tbf[tbf->tfi] = NULL; + 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; + pdch->ul_tbf[tbf->tfi()] = NULL; tbf->pdch[ts] = NULL; } } else { - bts->trx[tbf->trx].dl_tbf[tbf->tfi] = NULL; + 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; + pdch->dl_tbf[tbf->tfi()] = NULL; tbf->pdch[ts] = NULL; } } @@ -268,60 +274,56 @@ static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) 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->diag, "+---------------+"); - debug_diagram(tbf->diag, "| THE END |"); - debug_diagram(tbf->diag, "+---------------+"); - LOGP(DRLCMAC, LOGL_INFO, "Free %s TBF=%d with TLLI=0x%08x.\n", - (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, - tbf->tlli); + LOGP(DRLCMAC, LOGL_INFO, "%s free\n", tbf_name(tbf)); if (tbf->ul_ass_state != GPRS_RLCMAC_UL_ASS_NONE) - LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending uplink " + LOGP(DRLCMAC, LOGL_ERROR, "%s Software error: Pending uplink " "assignment. This may not happen, because the " "assignment message never gets transmitted. Please " - "be shure not to free in this state. PLEASE FIX!\n"); + "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, "Software error: Pending downlink " + LOGP(DRLCMAC, LOGL_ERROR, "%s Software error: Pending downlink " "assignment. This may not happen, because the " "assignment message never gets transmitted. Please " - "be shure not to free in this state. PLEASE FIX!\n"); - tbf_timer_stop(tbf); - while ((msg = msgb_dequeue(&tbf->llc_queue))) - msgb_free(msg); + "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" + tbf->m_llc.clear(tbf->bts); 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 tbf_update(struct gprs_rlcmac_tbf *tbf) +int gprs_rlcmac_tbf::update() { - struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; 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 (tbf->direction != GPRS_RLCMAC_DL_TBF) + if (direction != GPRS_RLCMAC_DL_TBF) return -EINVAL; - if (!tbf->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); - ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); - - tbf_unlink_pdch(tbf); - rc = bts->alloc_algorithm(bts, ul_tbf, tbf, bts->alloc_algorithm_curst, 0); - /* if no ressource */ + 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 ressource after update???\n"); + LOGP(DRLCMAC, LOGL_ERROR, "No resource after update???\n"); return -rc; } @@ -353,9 +355,8 @@ static const char *tbf_state_name[] = { void tbf_new_state(struct gprs_rlcmac_tbf *tbf, enum gprs_rlcmac_tbf_state state) { - debug_diagram(tbf->diag, "->%s", tbf_state_name[state]); - LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d changes state from %s to %s\n", - (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, + 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); } @@ -364,14 +365,12 @@ 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, "Starting %s TBF=%d timer %u.\n", - (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", - tbf->tfi, T); + LOGP(DRLCMAC, LOGL_DEBUG, "%s starting timer %u.\n", + tbf_name(tbf), T); else - LOGP(DRLCMAC, LOGL_DEBUG, "Restarting %s TBF=%d timer %u " + LOGP(DRLCMAC, LOGL_DEBUG, "%s restarting timer %u " "while old timer %u pending \n", - (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", - tbf->tfi, T, tbf->T); + tbf_name(tbf), T, tbf->T); tbf->T = T; tbf->num_T_exp = 0; @@ -383,80 +382,110 @@ void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, osmo_timer_schedule(&tbf->timer, seconds, microseconds); } -void tbf_timer_stop(struct gprs_rlcmac_tbf *tbf) +void gprs_rlcmac_tbf::stop_t3191() { - if (osmo_timer_pending(&tbf->timer)) { - LOGP(DRLCMAC, LOGL_DEBUG, "Stopping %s TBF=%d timer %u.\n", - (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", - tbf->tfi, tbf->T); - osmo_timer_del(&tbf->timer); - } -} - -/* lookup TBF Entity (by TFI) */ -struct gprs_rlcmac_tbf *tbf_by_tfi(struct gprs_rlcmac_bts *bts, - uint8_t tfi, uint8_t trx, enum gprs_rlcmac_tbf_direction dir) -{ - struct gprs_rlcmac_tbf *tbf; - - if (tfi >= 32 || trx >= 8) - return NULL; - - if (dir == GPRS_RLCMAC_UL_TBF) - tbf = bts->trx[trx].ul_tbf[tfi]; - else - tbf = bts->trx[trx].dl_tbf[tfi]; - if (!tbf) - return NULL; - - if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)) - return tbf; - - return NULL; + return stop_timer(); } -/* search for active downlink or uplink tbf */ -struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, - enum gprs_rlcmac_tbf_direction dir) +void gprs_rlcmac_tbf::stop_timer() { - struct gprs_rlcmac_tbf *tbf; - if (dir == GPRS_RLCMAC_UL_TBF) { - llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) { - if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) - && tbf->tlli == tlli && tbf->tlli_valid) - return tbf; - } - } else { - llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) { - if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) - && tbf->tlli == tlli) - return tbf; - } + if (osmo_timer_pending(&timer)) { + LOGP(DRLCMAC, LOGL_DEBUG, "%s stopping timer %u.\n", + tbf_name(this), T); + osmo_timer_del(&timer); } - return NULL; } -struct gprs_rlcmac_tbf *tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts) +void gprs_rlcmac_tbf::poll_timeout() { - struct gprs_rlcmac_tbf *tbf; + LOGP(DRLCMAC, LOGL_NOTICE, "%s poll timeout\n", + tbf_name(this)); - /* only one TBF can poll on specific TS/FN, because scheduler can only - * schedule one downlink control block (with polling) at a FN per TS */ - llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) { - if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) - && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED - && tbf->poll_fn == fn && tbf->trx == trx - && tbf->control_ts == ts) - return tbf; - } - llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) { - if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) - && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED - && tbf->poll_fn == fn && tbf->trx == trx - && tbf->control_ts == ts) - return tbf; - } - return NULL; + 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; + if (state_is(GPRS_RLCMAC_FINISHED)) { + dir.ul.n3103++; + if (dir.ul.n3103 == bts->bts_data()->n3103) { + LOGP(DRLCMAC, LOGL_NOTICE, + "- N3103 exceeded\n"); + 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; + n3105++; + if (n3105 == bts_data()->n3105) { + LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); + 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; + n3105++; + if (n3105 == bts->bts_data()->n3105) { + LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); + 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); + } + n3105++; + if (n3105 == bts->bts_data()->n3105) { + LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); + 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, @@ -467,24 +496,6 @@ struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts, 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, &gprs_rlcmac_ul_tbfs, list) { - if (tbf->diag == diagram_num) - goto next_diagram; - } - llist_for_each_entry(tbf, &gprs_rlcmac_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", @@ -497,20 +508,16 @@ next_diagram: if (!tbf) return NULL; -#ifdef DEBUG_DIAGRAM - tbf->diag = diagram_num; -#endif + tbf->m_created_ts = time(NULL); + tbf->bts = bts->bts; tbf->direction = dir; - tbf->tfi = tfi; - tbf->trx = trx; - tbf->arfcn = bts->trx[trx].arfcn; + 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 ressource */ + /* if no resource */ if (rc < 0) { talloc_free(tbf); return NULL; @@ -518,7 +525,7 @@ next_diagram: /* assign control ts */ tbf->control_ts = 0xff; rc = tbf_assign_control_ts(tbf); - /* if no ressource */ + /* if no resource */ if (rc < 0) { talloc_free(tbf); return NULL; @@ -529,74 +536,71 @@ next_diagram: 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, &gprs_rlcmac_ul_tbfs); - else - llist_add(&tbf->list, &gprs_rlcmac_dl_tbfs); - - debug_diagram(tbf->diag, "+-----------------+"); - debug_diagram(tbf->diag, "|NEW %s TBF TFI=%2d|", - (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi); - debug_diagram(tbf->diag, "+-----------------+"); + tbf->m_llc.init(); + 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(); + } return tbf; } -void tbf_timer_cb(void *_tbf) +static void tbf_timer_cb(void *_tbf) { struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; + tbf->handle_timeout(); +} - LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", - (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, - tbf->T); +void gprs_rlcmac_tbf::handle_timeout() +{ + LOGP(DRLCMAC, LOGL_DEBUG, "%s timer %u expired.\n", + tbf_name(this), T); - tbf->num_T_exp++; + num_T_exp++; - switch (tbf->T) { -#ifdef DEBUG_DL_ASS_IDLE - case 1234: - gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); - break; -#endif + switch (T) { case 0: /* assignment */ - if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { - if (tbf->state_is(GPRS_RLCMAC_ASSIGN)) { - LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to " - "PACCH assignment timeout.\n"); - tbf_free(tbf); + 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); + return; } else - LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not " - "in assign state\n"); + LOGP(DRLCMAC, LOGL_ERROR, "Error: %s is not " + "in assign state\n", tbf_name(this)); } - if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { + if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { /* change state to FLOW, so scheduler will start transmission */ - tbf->dir.dl.wait_confirm = 0; - if (tbf->state_is(GPRS_RLCMAC_ASSIGN)) { - tbf_new_state(tbf, GPRS_RLCMAC_FLOW); - tbf_assign_control_ts(tbf); + 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, "Continue flow after " - "IMM.ASS confirm\n"); + 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, "TBF T%d timeout during " - "transsmission\n", tbf->T); - tbf->rlcmac_diag(); + LOGP(DRLCMAC, LOGL_NOTICE, "%s T%d timeout during " + "transsmission\n", tbf_name(this), T); + rlcmac_diag(); /* fall through */ case 3193: - if (tbf->T == 3193) - debug_diagram(tbf->diag, "T3193 timeout"); - LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); + LOGP(DRLCMAC, LOGL_DEBUG, + "%s will be freed due to timeout\n", tbf_name(this)); /* free TBF */ - tbf_free(tbf); + tbf_free(this); + return; break; default: - LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", - tbf->T); + LOGP(DRLCMAC, LOGL_ERROR, + "%s timer expired in unknown mode: %u\n", tbf_name(this), T); } } @@ -618,6 +622,818 @@ int gprs_rlcmac_tbf::rlcmac_diag() 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 = m_llc.dequeue())) { + tv = (struct timeval *)msg->data; + msgb_pull(msg, sizeof(*tv)); + msgb_pull(msg, sizeof(*tv)); + + if (gprs_llc::is_frame_expired(&tv_now, tv)) { + LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " + "because lifetime limit reached. Queue size %zu\n", + tbf_name(this), m_llc.m_queue_size); + bts->llc_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; +} + +/* + * Store received block data in LLC message(s) and forward to SGSN + * if complete. + */ +int gprs_rlcmac_tbf::assemble_forward_llc(const gprs_rlc_data *_data) +{ + const uint8_t *data = _data->block; + uint8_t len = _data->len; + const struct rlc_ul_header *rh = (const 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]; + } + if (!m_llc.fits_in_current_frame(chunk)) { + LOGP(DRLCMACUL, LOGL_NOTICE, "%s LLC frame exceeds " + "maximum size %u.\n", tbf_name(this), + m_llc.remaining_space()); + chunk = m_llc.remaining_space(); + } + m_llc.append_frame(data + frame_offset[i], chunk); + m_llc.consume(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) , m_llc.frame_length()); + snd_ul_ud(); + m_llc.reset(); + /* 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), m_llc.frame_length()); + snd_ul_ud(); + m_llc.reset(); + } + } + + 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) +{ + LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " + "V(S)==%d)\n", tbf_name(this), + dir.dl.window.v_a(), dir.dl.window.v_s()); + +do_resend: + /* check if there is a block with negative acknowledgement */ + int resend_bsn = dir.dl.window.resend_needed(); + if (resend_bsn >= 0) { + LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", resend_bsn); + /* re-send block with negative aknowlegement */ + dir.dl.window.m_v_b.mark_unacked(resend_bsn); + bts->rlc_resent(); + return create_dl_acked_block(fn, ts, resend_bsn, false); + } + + /* if the window has stalled, or transfer is complete, + * send an unacknowledged block */ + if (state_is(GPRS_RLCMAC_FINISHED) || dl_window_stalled()) { + if (state_is(GPRS_RLCMAC_FINISHED)) { + LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " + "because all blocks have been transmitted.\n", + dir.dl.window.v_a()); + bts->rlc_restarted(); + } else { + LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " + "because all window is stalled.\n", + dir.dl.window.v_a()); + bts->rlc_stalled(); + } + /* 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.window.window_empty()) { + LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " + "so we re-transmit final block!\n"); + /* we just send final block again */ + int16_t index = dir.dl.window.v_s_mod(-1); + bts->rlc_resent(); + return create_dl_acked_block(fn, ts, index, false); + } + + /* cycle through all unacked blocks */ + int resend = dir.dl.window.mark_for_resend(); + + /* At this point there should be at least 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 */ + int16_t index = dir.dl.window.v_s_mod(-1); + return create_dl_acked_block(fn, ts, index, false); + } + goto do_resend; + } + + return create_new_bsn(fn, ts); +} + +struct msgb *gprs_rlcmac_tbf::create_new_bsn(const uint32_t fn, const uint8_t ts) +{ + struct rlc_dl_header *rh; + struct rlc_li_field *li; + struct msgb *msg; + uint8_t *delimiter, *data, *e_pointer; + uint16_t space, chunk; + gprs_rlc_data *rlc_data; + bool first_fin_ack = false; + const uint16_t bsn = dir.dl.window.v_s(); + + LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", + dir.dl.window.v_s()); + +#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; + } + /* total length of block, including spare bits */ + const uint8_t block_length = gprs_rlcmac_cs[cs].block_length; + /* length of usable data of block, w/o spare bits, inc. MAC */ + const uint8_t block_data_len = gprs_rlcmac_cs[cs].block_data; + + /* now we still have untransmitted LLC data, so we fill mac block */ + rlc_data = m_rlc.block(bsn); + data = rlc_data->prepare(block_data_len); + + 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 = bsn; /* Block Sequence Number */ + rh->e = 0; /* Extension bit, maybe set later */ + e_pointer = data + 2; /* points to E of current chunk */ + data += sizeof(*rh); + delimiter = data; /* where next length header would be stored */ + space = block_data_len - sizeof(*rh); + while (1) { + chunk = m_llc.chunk_size(); + /* 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 */ + m_llc.consume(data, space); + /* return data block as message */ + break; + } + /* if FINAL chunk would fit precisely in space left */ + if (chunk == space && llist_empty(&m_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), m_llc.frame_length()); + gprs_rlcmac_dl_bw(this, m_llc.frame_length()); + /* block is filled, so there is no extension */ + *e_pointer |= 0x01; + /* fill space */ + m_llc.consume(data, space); + m_llc.reset(); + /* 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) + memmove(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 */ + m_llc.consume(data, 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) + memmove(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 and reset later */ + m_llc.consume(data, chunk); + data += chunk; + space -= chunk; + LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" + "len=%d\n", tbf_name(this), m_llc.frame_length()); + gprs_rlcmac_dl_bw(this, m_llc.frame_length()); + m_llc.reset(); + /* 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); + m_llc.put_frame(msg->data, msg->len); + bts->llc_frame_sched(); + msgb_free(msg); + } + /* if we have more data and we have space left */ + if (space > 0 && m_llc.frame_length()) { + li->m = 1; /* we indicate more frames to follow */ + continue; + } + /* if we don't have more LLC frames */ + if (!m_llc.frame_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 = true; + /* + 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_data->block, block_length)); +#warning "move this up?" + rlc_data->len = block_length; + /* raise send state and set ack state array */ + dir.dl.window.m_v_b.mark_unacked(bsn); + dir.dl.window.increment_send(); + + return create_dl_acked_block(fn, ts, bsn, first_fin_ack); +} + +struct msgb *gprs_rlcmac_tbf::create_dl_acked_block( + const uint32_t fn, const uint8_t ts, + const int index, const bool first_fin_ack) +{ + uint8_t *data; + struct rlc_dl_header *rh; + struct msgb *dl_msg; + uint8_t len; + + /* get data and header from current block */ + data = m_rlc.block(index)->block; + len = m_rlc.block(index)->len; + 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(DRLCMACDL, 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(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " + "sheduled in this TS %d, waiting for " + "TS %d\n", ts, control_ts); +#warning "What happens to the first_fin_ack in case something is already scheduled?" + else if (bts->sba()->find(trx->trx_no, ts, (fn + 13) % 2715648)) + LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " + "sheduled, because single block alllocation " + "already exists\n"); + else { + LOGP(DRLCMACDL, 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; + + /* set polling in header */ + rh->rrbp = 0; /* N+13 */ + rh->s_p = 1; /* Polling */ + } + } + + /* return data block as message */ + dl_msg = msgb_alloc(len, "rlcmac_dl_data"); + if (!dl_msg) + return NULL; + + /* Increment TX-counter */ + dir.dl.tx_counter++; + + memcpy(msgb_put(dl_msg, len), data, len); + bts->rlc_sent(); + + 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 = 1; + + if (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(); + + } + + return msg; +} + +struct msgb *gprs_rlcmac_tbf::create_ul_ass(uint32_t fn) +{ + struct msgb *msg; + struct gprs_rlcmac_tbf *new_tbf; + + 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; + } + + /* 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, 1, 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); + + poll_state = GPRS_RLCMAC_POLL_SCHED; + poll_fn = (fn + 13) % 2715648; + ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; + + 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; + + return msg; +} + +int gprs_rlcmac_tbf::update_window(const uint8_t ssn, const uint8_t *rbb) +{ + int16_t dist; /* must be signed */ + uint16_t lost = 0, received = 0; + char show_rbb[65]; + char show_v_b[RLC_MAX_SNS + 1]; + const uint16_t mod_sns = dir.dl.window.mod_sns(); + + Decoding::extract_rbb(rbb, show_rbb); + /* show received array in debug (bit 64..1) */ + LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" + "(BSN=%d) R=ACK I=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.window.v_s() - ssn) & mod_sns; + /* check if distance is less than distance V(A)..V(S) */ + if (dist >= dir.dl.window.distance()) { + /* 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 */ + } + + dir.dl.window.update(bts, show_rbb, ssn, + &lost, &received); + + /* report lost and received packets */ + gprs_rlcmac_received_lost(this, received, lost); + + /* raise V(A), if possible */ + dir.dl.window.raise(dir.dl.window.move_window()); + + /* show receive state array in debug (V(A)..V(S)-1) */ + dir.dl.window.show_state(show_v_b); + LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" + "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " + "X=Resend-Unacked I=Invalid\n", + dir.dl.window.v_a(), show_v_b, + dir.dl.window.v_s_mod(-1)); + + if (state_is(GPRS_RLCMAC_FINISHED) && dir.dl.window.window_empty()) { + LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " + "all blocks, but without final ack " + "inidcation (don't worry)\n"); + } + return 0; +} + + +int gprs_rlcmac_tbf::maybe_start_new_window() +{ + struct msgb *msg; + uint16_t received; + + LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); + /* range V(A)..V(S)-1 */ + received = dir.dl.window.count_unacked(); + + /* report all outstanding packets as received */ + gprs_rlcmac_received_lost(this, received, 0); + + /* 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 */ + 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; + } + + /* we have more data so we will re-use this tbf */ + reuse_tbf(msg->data, msg->len); + msgb_free(msg); + return 0; +} + +int gprs_rlcmac_tbf::snd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb) +{ + LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); + + if (!final_ack) + return update_window(ssn, rbb); + return maybe_start_new_window(); +} + void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) { for (uint8_t tfi = 0; tfi < 32; tfi++) { @@ -645,3 +1461,321 @@ void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_pdch *pdch) 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::extract_tlli(const uint8_t *data, const size_t len) +{ + struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; + struct rlc_ul_header *rh = (struct rlc_ul_header *)data; + uint32_t new_tlli; + int rc; + + /* 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, &new_tlli); + if (rc) { + bts->decode_error(); + LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " + "of UL DATA TFI=%d.\n", rh->tfi); + return 0; + } + update_tlli(new_tlli); + LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " + "UL DATA TFI=%d.\n", tlli(), rh->tfi); + if ((dl_tbf = bts->tbf_by_tlli(tlli(), GPRS_RLCMAC_DL_TBF))) { + LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " + "TLLI=0x%08x while %s still exists. " + "Killing pending DL TBF\n", tlli(), + tbf_name(dl_tbf)); + tbf_free(dl_tbf); + dl_tbf = NULL; + } + /* tbf_by_tlli will not find your TLLI, because it is not + * yet marked valid */ + if ((ul_tbf = bts->tbf_by_tlli(tlli(), GPRS_RLCMAC_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; + } + /* mark TLLI valid now */ + tlli_mark_valid(); + /* store current timing advance */ + bts->timing_advance()->remember(tlli(), ta); + return 1; +} + +int gprs_rlcmac_tbf::rcv_data_block_acknowledged(const uint8_t *data, size_t len, int8_t rssi) +{ + struct rlc_ul_header *rh = (struct rlc_ul_header *)data; + int rc; + + const uint16_t mod_sns = dir.ul.window.mod_sns(); + const uint16_t ws = dir.ul.window.ws(); + + 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.window.v_q(), + this->dir.ul.window.v_r()); + + /* process RSSI */ + gprs_rlcmac_rssi(this, rssi); + + /* get TLLI */ + if (!this->is_tlli_valid()) { + if (!extract_tlli(data, len)) + return 0; + /* 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; + } + } + + /* restart T3169 */ + tbf_timer_start(this, 3169, bts_data()->t3169, 0); + + /* Increment RX-counter */ + this->dir.ul.rx_counter++; + + if (!dir.ul.window.is_in_window(rh->bsn)) { + LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " + "%d..%d (it's normal)\n", rh->bsn, + dir.ul.window.v_q(), + (dir.ul.window.v_q() + ws - 1) & mod_sns); + maybe_schedule_uplink_acknack(rh); + return 0; + } + + /* Write block to buffer and set receive state array. */ + m_rlc.block(rh->bsn)->put_data(data, len); + LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", + rh->bsn, dir.ul.window.v_q(), + (dir.ul.window.v_q() + ws - 1) & mod_sns); + + /* 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.*/ + const uint16_t v_q_beg = dir.ul.window.v_q(); + + const uint16_t count = dir.ul.window.receive_bsn(rh->bsn); + + /* Retrieve LLC frames from blocks that are ready */ + for (uint16_t i = 0; i < count; ++i) { + uint16_t index = (v_q_beg + i) & mod_sns; + assemble_forward_llc(m_rlc.block(index)); + } + + /* Check CV of last frame in buffer */ + if (this->state_is(GPRS_RLCMAC_FLOW) /* still in flow state */ + && this->dir.ul.window.v_q() == this->dir.ul.window.v_r()) { /* if complete */ + struct rlc_ul_header *last_rh = (struct rlc_ul_header *) + m_rlc.block((dir.ul.window.v_r() - 1) & mod_sns)->block; + 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 */ + maybe_schedule_uplink_acknack(rh); + + return 0; +} + +void gprs_rlcmac_tbf::maybe_schedule_uplink_acknack(const rlc_ul_header *rh) +{ + if (rh->si || rh->ti || state_is(GPRS_RLCMAC_FINISHED) + || (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 (state_is(GPRS_RLCMAC_FINISHED)) { + LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " + "because last block has CV==0.\n"); + } + if ((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 (ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { + /* trigger sending at next RTS */ + 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"); + } + } +} + +/* 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 + m_llc.frame_length(); + struct bssgp_bvc_ctx *bctx = gprs_bssgp_pcu_current_bctx(); + + LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] %s len=%d\n", tbf_name(this), m_llc.frame_length()); + if (!bctx) { + LOGP(DBSSGP, LOGL_ERROR, "No bctx\n"); + m_llc.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)*m_llc.frame_length())); + tl16v_put(buf, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*m_llc.frame_length(), m_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); + + m_llc.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; +} + + +void gprs_rlcmac_tbf::reuse_tbf(const uint8_t *data, const uint16_t len) +{ + bts->tbf_reused(); + m_llc.put_frame(data, len); + bts->llc_frame_sched(); + + /* reset rlc states */ + memset(&dir.dl, 0, sizeof(dir.dl)); + dir.dl.window.m_v_b.reset(); + + /* keep to flags */ + state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; + state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); + + update(); + + LOGP(DRLCMAC, LOGL_DEBUG, "%s Trigger dowlink assignment on PACCH, " + "because another LLC PDU has arrived in between\n", + tbf_name(this)); + bts->trigger_dl_ass(this, this, NULL); +} + +bool gprs_rlcmac_tbf::dl_window_stalled() const +{ + return dir.dl.window.window_stalled(); +} + +void gprs_rlcmac_tbf::rotate_in_list() +{ + llist_del(&list); + if (direction == GPRS_RLCMAC_UL_TBF) + llist_add(&list, &bts->bts_data()->ul_tbfs); + else + llist_add(&list, &bts->bts_data()->dl_tbfs); +} + +uint8_t gprs_rlcmac_tbf::tsc() const +{ + return trx->pdch[first_ts].tsc; +} + +void tbf_print_vty_info(struct vty *vty, llist_head *ltbf) +{ + gprs_rlcmac_tbf *tbf = llist_entry(ltbf, gprs_rlcmac_tbf, list); + + vty_out(vty, "TBF: TFI=%d TLLI=0x%08x (%s) DIR=%s IMSI=%s%s", tbf->tfi(), + tbf->tlli(), tbf->is_tlli_valid() ? "valid" : "invalid", + tbf->direction == GPRS_RLCMAC_UL_TBF ? "UL" : "DL", + tbf->imsi(), VTY_NEWLINE); + vty_out(vty, " created=%lu state=%08x 1st_TS=%d 1st_cTS=%d ctrl_TS=%d " + "MS_CLASS=%d%s", + tbf->created_ts(), tbf->state_flags, tbf->first_ts, + tbf->first_common_ts, tbf->control_ts, tbf->ms_class, + VTY_NEWLINE); + vty_out(vty, " TS_alloc="); + for (int i = 0; i < 8; i++) { + if (tbf->pdch[i]) + vty_out(vty, "%d ", i); + } + vty_out(vty, " CS=%d%s%s", tbf->cs, VTY_NEWLINE, VTY_NEWLINE); +} |