diff options
Diffstat (limited to 'src/gprs_rlcmac_data.cpp')
| -rw-r--r-- | src/gprs_rlcmac_data.cpp | 841 |
1 files changed, 631 insertions, 210 deletions
diff --git a/src/gprs_rlcmac_data.cpp b/src/gprs_rlcmac_data.cpp index 12ac1ae6..edc324b0 100644 --- a/src/gprs_rlcmac_data.cpp +++ b/src/gprs_rlcmac_data.cpp @@ -22,11 +22,22 @@ #include <gprs_rlcmac.h> #include <pcu_l1_if.h> -/* After receiving these framess, we send ack/nack. */ -#define ACK_AFTER_FRAMES 20 +extern void *tall_pcu_ctx; -/* If acknowledgement to uplink/downlin assignmentshould be polled */ -#define POLLING_ASSIGNMENT 0 +extern "C" { +int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, + uint8_t num_frames, uint32_t num_octets); +} + +/* After receiving these frames, we send ack/nack. */ +#define SEND_ACK_AFTER_FRAMES 20 + +/* After sending these frames, we poll for ack/nack. */ +#define POLL_ACK_AFTER_FRAMES 20 + +/* If acknowledgement to uplink/downlink assignmentshould be polled */ +#define POLLING_ASSIGNMENT_DL 1 +#define POLLING_ASSIGNMENT_UL 1 extern "C" { /* TS 04.60 10.2.2 */ @@ -62,22 +73,49 @@ struct rlc_li_field { } __attribute__ ((packed)); } +static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll, + char *imsi); + +static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf) +{ + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) + LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n"); + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) + LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n"); + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA))) + LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n"); + else if (tbf->direction == GPRS_RLCMAC_UL_TBF) + LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n"); + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) + LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n"); + else if (tbf->direction == GPRS_RLCMAC_DL_TBF) + LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n"); + + return 0; +} + int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf) { - LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for TBF=%d\n", tbf->tfi); + LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", + (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi); tbf->poll_state = GPRS_RLCMAC_POLL_NONE; if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { - LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " - "CONTROL ACK for PACKET UPLINK ACK\n"); + if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { + LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " + "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); + gprs_rlcmac_diag(tbf); + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); + } tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; if (tbf->state == GPRS_RLCMAC_FINISHED) { struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; tbf->dir.ul.n3103++; if (tbf->dir.ul.n3103 == bts->n3103) { - LOGP(DRLCMAC, LOGL_DEBUG, "- N3103 exceeded\n"); + LOGP(DRLCMAC, LOGL_NOTICE, + "- N3103 exceeded\n"); tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); tbf_timer_start(tbf, 3169, bts->t3169, 0); return 0; @@ -87,46 +125,140 @@ int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf) } } else if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { - LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " - "CONTROL ACK for PACKET UPLINK ASSIGNMENT.\n"); + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; + + if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { + LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " + "PACKET CONTROL ACK for PACKET UPLINK " + "ASSIGNMENT.\n"); + gprs_rlcmac_diag(tbf); + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); + } tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; + tbf->n3105++; + if (tbf->n3105 == bts->n3105) { + LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); + tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); + tbf_timer_start(tbf, 3195, bts->t3195, 0); + return 0; + } + /* reschedule UL assignment */ + tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; } else if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { - LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " - "CONTROL ACK for PACKET DOWNLINK ASSIGNMENT.\n"); + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; + + if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { + LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " + "PACKET CONTROL ACK for PACKET DOWNLINK " + "ASSIGNMENT.\n"); + gprs_rlcmac_diag(tbf); + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); + } tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; - /* in case out downlink assigment failed: */ - if (tbf->state == GPRS_RLCMAC_ASSIGN) { - LOGP(DRLCMAC, LOGL_DEBUG, "- Assignment failed\n"); - tbf_free(tbf); + tbf->n3105++; + if (tbf->n3105 == bts->n3105) { + LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); + tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); + tbf_timer_start(tbf, 3195, bts->t3195, 0); + return 0; } + /* reschedule DL assignment */ + tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; } else - if (tbf->direction == GPRS_RLCMAC_DL_TBF) - { + if (tbf->direction == GPRS_RLCMAC_DL_TBF) { struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; - LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " - " DOWNLINK ACK.\n"); - tbf->dir.dl.n3105++; - if (tbf->dir.dl.n3105 == bts->n3105) { - LOGP(DRLCMAC, LOGL_DEBUG, "- N3105 exceeded\n"); + if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { + LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " + "PACKET DOWNLINK ACK.\n"); + gprs_rlcmac_diag(tbf); + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); + } + tbf->n3105++; + if (tbf->n3105 == bts->n3105) { + LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); tbf_timer_start(tbf, 3195, bts->t3195, 0); return 0; } + /* resend IMM.ASS on CCCH on timeout */ + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) + && !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { + LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " + "for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi, + tbf->dir.dl.imsi); + /* send immediate assignment */ + gprs_rlcmac_downlink_assignment(tbf, 0, tbf->dir.dl.imsi); + tbf->dir.dl.wait_confirm = 1; + } + } else + LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); + + return 0; +} + +static uint8_t get_ms_class_by_capability(MS_Radio_Access_capability_t *cap) +{ + int i; + + for (i = 0; i < cap->Count_MS_RA_capability_value; i++) { + if (!cap->MS_RA_capability_value[i].u.Content.Exist_Multislot_capability) + continue; + if (!cap->MS_RA_capability_value[i].u.Content.Multislot_capability.Exist_GPRS_multislot_class) + continue; + return cap->MS_RA_capability_value[i].u.Content.Multislot_capability.GPRS_multislot_class; } return 0; } +static struct gprs_rlcmac_tbf *alloc_ul_tbf(int8_t use_trx, int8_t first_ts, + uint8_t ms_class, uint32_t tlli, uint8_t ta, + struct gprs_rlcmac_tbf *dl_tbf) +{ + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; + uint8_t trx, ts; + struct gprs_rlcmac_tbf *tbf; + uint8_t tfi; + + /* create new TBF, use sme TRX as DL TBF */ + tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, use_trx, first_ts); + if (tfi < 0) { + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); + /* FIXME: send reject */ + return NULL; + } + /* use multislot class of downlink TBF */ + tbf = tbf_alloc(dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ts, ms_class, 0); + if (!tbf) { + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); + /* FIXME: send reject */ + return NULL; + } + tbf->tlli = tlli; + tbf->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; +} + + + /* Received Uplink RLC control block. */ -int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn) +int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint8_t trx, uint8_t ts, + uint32_t fn) { - uint8_t tfi = 0; + int8_t tfi = 0; /* must be signed */ uint32_t tlli = 0; struct gprs_rlcmac_tbf *tbf; + int rc; - RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t)); + RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t); LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); LOGPC(DCSN1, LOGL_NOTICE, "\n"); @@ -134,10 +266,11 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn) switch (ul_control_block->u.MESSAGE_TYPE) { case MT_PACKET_CONTROL_ACK: tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; - tbf = tbf_by_poll_fn(fn); + tbf = tbf_by_poll_fn(fn, trx, ts); if (!tbf) { LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " - "unknown FN=%u TLL=0x%08x\n", fn, tlli); + "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", + fn, tlli, trx, ts); break; } tfi = tbf->tfi; @@ -153,17 +286,64 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn) if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; + if ((tbf->state_flags & + (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { + tbf->state_flags &= + ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " + "ack\n"); + } tbf_free(tbf); break; } if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); + /* reset N3105 */ + tbf->n3105 = 0; tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; + if (tbf->direction == GPRS_RLCMAC_UL_TBF) + tbf = tbf_by_tlli(tbf->tlli, + GPRS_RLCMAC_DL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " + "TBF is gone\n"); + break; + } + tbf_new_state(tbf, GPRS_RLCMAC_FLOW); + /* stop pending assignment timer */ + tbf_timer_stop(tbf); + if ((tbf->state_flags & + (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { + tbf->state_flags &= + ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " + "assignment\n"); + } + tbf_assign_control_ts(tbf); break; } if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); + /* reset N3105 */ + tbf->n3105 = 0; tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; + if (tbf->direction == GPRS_RLCMAC_DL_TBF) + tbf = tbf_by_tlli(tbf->tlli, + GPRS_RLCMAC_UL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " + "TBF is gone\n"); + break; + } + tbf_new_state(tbf, GPRS_RLCMAC_FLOW); + if ((tbf->state_flags & + (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { + tbf->state_flags &= + ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " + "assignment\n"); + } + tbf_assign_control_ts(tbf); break; } LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " @@ -171,54 +351,39 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn) break; case MT_PACKET_DOWNLINK_ACK_NACK: tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; - tbf = tbf_by_poll_fn(fn); + tbf = tbf_by_poll_fn(fn, trx, ts); if (!tbf) { LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " - "unknown FN=%u TBF=%d\n", fn, tfi); + "unknown FN=%u TBF=%d (TRX %d TS %d)\n", + fn, tfi, trx, ts); break; } + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { + tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack\n"); + } /* reset N3105 */ - tbf->dir.dl.n3105 = 0; + tbf->n3105 = 0; /* stop timer T3191 */ tbf_timer_stop(tbf); tlli = tbf->tlli; LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); tbf->poll_state = GPRS_RLCMAC_POLL_NONE; - gprs_rlcmac_downlink_ack(tbf, + rc = gprs_rlcmac_downlink_ack(tbf, ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP); + if (rc == 1) { + tbf_free(tbf); + break; + } /* check for channel request */ if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) { - uint8_t trx, ts, usf; - struct gprs_rlcmac_tbf *ul_tbf; - struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; - LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " "message, so we provide one:\n"); -uplink_request: - /* create new tbf */ - tfi = tfi_alloc(&trx, &ts); - if (tfi < 0) { - LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); - /* FIXME: send reject */ - break; - } - usf = find_free_usf(trx, ts); - if (usf < 0) { - LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource for USF\n"); - /* FIXME: send reject */ - break; - } - ul_tbf = tbf_alloc(tfi, trx, ts); - ul_tbf->tlli = tbf->tlli; - ul_tbf->tlli_valid = 1; /* no content resolution */ - ul_tbf->ta = tbf->ta; /* use current TA */ - ul_tbf->direction = GPRS_RLCMAC_UL_TBF; - ul_tbf->dir.ul.usf = usf; - tbf_new_state(ul_tbf, GPRS_RLCMAC_FLOW); - tbf_timer_start(ul_tbf, 3169, bts->t3169, 0); + alloc_ul_tbf(tbf->trx, tbf->first_ts, tbf->ms_class, tbf->tlli, tbf->ta, tbf); /* schedule uplink assignment */ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; } @@ -227,22 +392,55 @@ uplink_request: if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); + if (tbf) { + LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " + "TLLI=0x%08x while UL TBF=%d still " + "exists. Killing pending DL TBF\n", + tlli, tbf->tfi); + tbf_free(tbf); + tbf = NULL; + } if (!tbf) { - LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TLLI=0x%08x\n", tlli); + uint8_t ms_class = 0; + struct gprs_rlcmac_tbf *dl_tbf; + + if ((dl_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { + LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " + "TLLI=0x%08x while DL TBF=%d still exists. " + "Killing pending DL TBF\n", tlli, + dl_tbf->tfi); + tbf_free(dl_tbf); + } + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " + "in packet ressource request of single " + "block, so we provide one:\n"); + if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) + ms_class = get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); + if (!ms_class) + LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); + tbf = alloc_ul_tbf(trx, ts, ms_class, tlli, 0, NULL); +#warning FIXME TA!!! + if (!tbf) + break; + /* set control ts to current MS's TS, until assignment complete */ + LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts); + tbf->control_ts = ts; + /* schedule uplink assignment */ + tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; break; } tfi = tbf->tfi; } else { if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; - tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF); + tbf = tbf_by_tfi(tfi, trx, GPRS_RLCMAC_DL_TBF); if (!tbf) { LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli); break; } } else { tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; - tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF); + tbf = tbf_by_tfi(tfi, trx, GPRS_RLCMAC_UL_TBF); if (!tbf) { LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli); break; @@ -250,16 +448,12 @@ uplink_request: } tlli = tbf->tlli; } - LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet resource request\n", tbf->tfi, tbf->tlli); -#warning FIXME -puts("FIXME: UL request during UL request"); exit(0); - - + LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] %s TFI: %u TLLI: 0x%08x FIXME: Packet ressource request\n", (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->tlli); break; default: LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); } - free(ul_control_block); + talloc_free(ul_control_block); return 1; } @@ -271,7 +465,8 @@ void tbf_timer_cb(void *_tbf) { struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; - LOGP(DRLCMAC, LOGL_DEBUG, "TBF=%d timer %u expired.\n", tbf->tfi, + LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", + (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->T); tbf->num_T_exp++; @@ -279,22 +474,36 @@ void tbf_timer_cb(void *_tbf) switch (tbf->T) { #ifdef DEBUG_DL_ASS_IDLE case 1234: - gprs_rlcmac_trigger_downlink_assignment(tbf, 0, debug_imsi); + gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); break; #endif case 0: /* assignment */ - /* change state to FLOW, so scheduler will start transmission */ - if (tbf->state == GPRS_RLCMAC_ASSIGN) - tbf_new_state(tbf, GPRS_RLCMAC_FLOW); - else - LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not in assign " - "state\n"); + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { + if (tbf->state == GPRS_RLCMAC_ASSIGN) { + LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to " + "PACCH assignment timeout.\n"); + tbf_free(tbf); + } else + LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not " + "in assign state\n"); + } + if ((tbf->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 == GPRS_RLCMAC_ASSIGN) { + tbf_new_state(tbf, GPRS_RLCMAC_FLOW); + tbf_assign_control_ts(tbf); + } else + LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after " + "IMM.ASS confirm\n"); + } break; case 3169: case 3191: case 3195: LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during " "transsmission\n", tbf->T); + gprs_rlcmac_diag(tbf); /* fall through */ case 3193: LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); @@ -495,8 +704,7 @@ static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, if (i != frames - 1) { /* send frame to SGSN */ LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " - "TBF=%d: %s\n", tbf->tfi, - osmo_hexdump(tbf->llc_frame, tbf->llc_index)); + "TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index); gprs_rlcmac_tx_ul_ud(tbf); tbf->llc_index = 0; /* reset frame space */ /* also check if CV==0, because the frame may fill up the @@ -507,8 +715,7 @@ static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, /* send frame to SGSN */ LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " "TBF=%d that fits precisely in last block: " - "%s\n", tbf->tfi, - osmo_hexdump(tbf->llc_frame, tbf->llc_index)); + "len=%d\n", tbf->tfi, tbf->llc_index); gprs_rlcmac_tx_ul_ud(tbf); tbf->llc_index = 0; /* reset frame space */ } @@ -523,11 +730,18 @@ struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, int final = (tbf->state == GPRS_RLCMAC_FINISHED); struct msgb *msg; - if (final && tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { - LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " - "sheduled for TBF=%d, so we must wait for final uplink " - "ack...\n", tbf->tfi); + if (final) { + if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { + LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " + "sheduled for TBF=%d, so we must wait for " + "final uplink ack...\n", tbf->tfi); + return NULL; + } + if (sba_find(tbf->trx, tbf->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"); @@ -540,18 +754,23 @@ struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, } bitvec_unhex(ack_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); - RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); + RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); write_packet_uplink_ack(mac_control_block, tbf, final); encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); bitvec_pack(ack_vec, msgb_put(msg, 23)); bitvec_free(ack_vec); - free(mac_control_block); + 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 aknowledged. */ + tbf->dir.ul.contention_resolution_done = 1; if (final) { tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; tbf->poll_fn = (fn + 13) % 2715648; /* waiting for final acknowledge */ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; + tbf->dir.ul.final_ack_sent = 1; } else tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; @@ -562,7 +781,8 @@ struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, * * The blocks are defragmented and forwarded as LLC frames, if complete. */ -int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) +int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t trx, uint8_t ts, + uint8_t *data, uint8_t len) { struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; struct gprs_rlcmac_tbf *tbf; @@ -592,24 +812,21 @@ int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) } /* find TBF inst from given TFI */ - tbf = tbf_by_tfi(rh->tfi, GPRS_RLCMAC_UL_TBF); + tbf = tbf_by_tfi(rh->tfi, trx, GPRS_RLCMAC_UL_TBF); if (!tbf) { LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", rh->tfi); return 0; } - - if (tbf->direction != GPRS_RLCMAC_UL_TBF) { - LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d not Uplink " - "tbf\n", rh->tfi); - return 0; - } + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); /* get TLLI */ if (!tbf->tlli_valid) { + struct gprs_rlcmac_tbf *dl_tbf; + /* no TLLI yet */ if (!rh->ti) { LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " @@ -625,6 +842,13 @@ int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) tbf->tlli_valid = 1; LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); + if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { + LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " + "TLLI=0x%08x while DL TBF=%d still exists. " + "Killing pending DL TBF\n", tbf->tlli, + dl_tbf->tfi); + tbf_free(dl_tbf); + } /* already have TLLI, but we stille get another one */ } else if (rh->ti) { uint32_t tlli; @@ -718,9 +942,9 @@ int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) /* If TLLI is included or if we received half of the window, we send * an ack/nack */ if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED - || (tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) { + || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { if (rh->si) { - LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " + LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " "because MS is stalled.\n"); } if (rh->ti) { @@ -731,10 +955,10 @@ int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " "because last block has CV==0.\n"); } - if ((tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) { + if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " "because %d frames received.\n", - ACK_AFTER_FRAMES); + SEND_ACK_AFTER_FRAMES); } if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { /* trigger sending at next RTS */ @@ -752,15 +976,23 @@ int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) struct msgb *gprs_rlcmac_send_packet_uplink_assignment( struct gprs_rlcmac_tbf *tbf, uint32_t fn) { + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; struct msgb *msg; struct gprs_rlcmac_tbf *new_tbf; +#if POLLING_ASSIGNMENT_UL == 1 if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " "sheduled for TBF=%d, so we must wait for uplink " "assignment...\n", tbf->tfi); return NULL; } + if (sba_find(tbf->trx, tbf->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. */ if (tbf->direction == GPRS_RLCMAC_DL_TBF) @@ -788,24 +1020,26 @@ struct msgb *gprs_rlcmac_send_packet_uplink_assignment( bitvec_unhex(ass_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); write_packet_uplink_assignment(ass_vec, tbf->tfi, - (tbf->direction == GPRS_RLCMAC_DL_TBF), 0, 0, new_tbf->tfi, - new_tbf->dir.ul.usf, new_tbf->arfcn, new_tbf->ts, new_tbf->ta, - new_tbf->tsc, POLLING_ASSIGNMENT); + (tbf->direction == GPRS_RLCMAC_DL_TBF), tbf->tlli, + tbf->tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts->alpha, + bts->gamma); bitvec_pack(ass_vec, msgb_put(msg, 23)); - RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); + 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 == 1 - FIXME process does not work, also the acknowledgement is not checked. +#if POLLING_ASSIGNMENT_UL == 1 tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; tbf->poll_fn = (fn + 13) % 2715648; tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; #else tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; + tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); + tbf_assign_control_ts(new_tbf); #endif return msg; @@ -816,39 +1050,76 @@ int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; struct gprs_rlcmac_tbf *tbf; uint8_t trx, ts; - int tfi, usf; /* must be signed */ + int8_t tfi; /* must be signed */ + uint8_t sb = 0; + uint32_t sb_fn = 0; + int rc; + uint8_t plen; LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " "one:\n"); - // Create new TBF - tfi = tfi_alloc(&trx, &ts); - if (tfi < 0) { - LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); - /* FIXME: send reject */ - return -EBUSY; - } - usf = find_free_usf(trx, ts); - if (usf < 0) { - LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource for USF\n"); - /* FIXME: send reject */ - return -EBUSY; + if ((ra & 0xf8) == 0x70) { + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " + "allocation\n"); + sb = 1; + } else if (bts->force_two_phase) { + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " + "but we force two phase access\n"); + sb = 1; } - tbf = tbf_alloc(tfi, trx, ts); if (qta < 0) qta = 0; if (qta > 252) qta = 252; - tbf->ta = qta >> 2; - tbf->direction = GPRS_RLCMAC_UL_TBF; - tbf->dir.ul.usf = usf; - tbf_new_state(tbf, GPRS_RLCMAC_FLOW); - tbf_timer_start(tbf, 3169, bts->t3169, 0); - LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi); - LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n", tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); - LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate Assignment Uplink (AGCH)\n", tbf->tfi); + if (sb) { + rc = sba_alloc(&trx, &ts, &sb_fn, qta >> 2); + if (rc < 0) + return rc; + LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d " + "ra=0x%02x, Fn=%d (%d,%d,%d)\n", qta, ra, Fn, + (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); + LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink " + "(AGCH)\n"); + } else { + // Create new TBF + tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, -1, -1); + if (tfi < 0) { + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); + /* FIXME: send reject */ + return -EBUSY; + } + /* set class to 0, since we don't know the multislot class yet */ + tbf = tbf_alloc(NULL, GPRS_RLCMAC_UL_TBF, tfi, trx, ts, 0, 1); + if (!tbf) { + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); + /* FIXME: send reject */ + return -EBUSY; + } + tbf->ta = qta >> 2; + tbf_new_state(tbf, GPRS_RLCMAC_FLOW); + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); + tbf_timer_start(tbf, 3169, bts->t3169, 0); + LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", + tbf->tfi); + LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH " + "qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n", tbf->tfi, + qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); + LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate " + "Assignment Uplink (AGCH)\n", tbf->tfi); + } bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */; - bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); - int plen = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, usf, 0, 0, 0); + bitvec_unhex(immediate_assignment, + "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); + if (sb) + plen = write_immediate_assignment(immediate_assignment, 0, ra, + Fn, qta >> 2, bts->trx[trx].arfcn, ts, + bts->trx[trx].pdch[ts].tsc, 0, 0, 0, 0, sb_fn, 1, + bts->alpha, bts->gamma); + else + plen = write_immediate_assignment(immediate_assignment, 0, ra, + Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, + tbf->tfi, tbf->dir.ul.usf[tbf->first_ts], 0, 0, 0, 0, + bts->alpha, bts->gamma); pcu_l1if_tx_agch(immediate_assignment, plen); bitvec_free(immediate_assignment); @@ -860,12 +1131,72 @@ int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) * DL data block flow */ +static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf) +{ + struct msgb *msg; + struct timeval *tv, tv_now; + uint32_t octets = 0, frames = 0; + + gettimeofday(&tv_now, NULL); + + while ((msg = msgb_dequeue(&tbf->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, "Discarding LLC PDU of " + "DL TBF=%d, because lifetime limit reached\n", + tbf->tfi); + 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, tbf->tlli, frames, octets); + } + + return msg; +} + +static int gprs_rlcmac_debug_bw(struct gprs_rlcmac_tbf *tbf, uint16_t octets) +{ + struct timeval now_tv, *bw_tv = &tbf->bw_tv; + uint32_t elapsed; + + tbf->bw_octets += octets; + + gettimeofday(&now_tv, NULL); + elapsed = ((now_tv.tv_sec - bw_tv->tv_sec) << 7) + + ((now_tv.tv_usec - bw_tv->tv_usec) << 7) / 1000000; + if (elapsed < 128) + return 0; + + LOGP(DRLCMACBW, LOGL_DEBUG, "DL Bandwitdh of TLLI=0x%08x: %d KBits/s\n", + tbf->tlli, tbf->bw_octets / elapsed); + + /* reset bandwidth values timestamp */ + memcpy(bw_tv, &now_tv, sizeof(struct timeval)); + tbf->bw_octets = 0; + + return 0; +} + /* send DL data block * * The messages are fragmented and forwarded as data blocks. */ struct msgb *gprs_rlcmac_send_data_block_acknowledged( - struct gprs_rlcmac_tbf *tbf, uint32_t fn) + struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) { struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; struct rlc_dl_header *rh; @@ -880,6 +1211,7 @@ struct msgb *gprs_rlcmac_send_data_block_acknowledged( uint8_t *delimiter, *data, *e_pointer; uint8_t len; uint16_t space, chunk; + int first_fin_ack; LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); @@ -910,7 +1242,7 @@ do_resend: "because all blocks have been transmitted.\n", tbf->dir.dl.v_a); else - LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " + LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " "because all window is stalled.\n", tbf->dir.dl.v_a); /* If V(S) == V(A) and finished state, we would have received @@ -920,9 +1252,8 @@ do_resend: * indication from MS. This should never happen if MS works * correctly. */ if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { - LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block " - "(including final block), but did not include " - "FINAL_ACK_INDICATION!\n"); + LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block, " + "but we still transmitting!\n"); /* we just send final block again */ index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); goto tx_block; @@ -957,23 +1288,13 @@ do_resend: /* now we still have untransmitted LLC data, so we fill mac block */ index = tbf->dir.dl.v_s & mod_sns_half; data = tbf->rlc_block[index]; - switch (bts->initial_cs) { - case 2: /* CS-2 */ - block_length = 34; - block_data = 33; - break; - case 3: /* CS-3 */ - block_length = 40; - block_data = 39; - break; - case 4: /* CS-4 */ - block_length = 54; - block_data = 53; - break; - default: /* CS-1 */ - block_length = 23; - block_data = 23; + if (tbf->cs == 0) { + tbf->cs = bts->initial_cs_dl; + if (tbf->cs < 1 || tbf->cs > 4) + tbf->cs = 1; } + block_length = gprs_rlcmac_cs[tbf->cs].block_length; + block_data = gprs_rlcmac_cs[tbf->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 */ @@ -1013,8 +1334,8 @@ do_resend: "header, and we are done\n", chunk, space); LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " "TBF=%d that fits precisely in last block: " - "%s\n", tbf->tfi, - osmo_hexdump(tbf->llc_frame, tbf->llc_length)); + "len=%d\n", tbf->tfi, tbf->llc_length); + gprs_rlcmac_debug_bw(tbf, tbf->llc_length); /* block is filled, so there is no extension */ *e_pointer |= 0x01; /* fill space */ @@ -1072,13 +1393,13 @@ do_resend: memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); data += chunk; space -= chunk; - LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: %s\n", - tbf->tfi, - osmo_hexdump(tbf->llc_frame, tbf->llc_length)); + LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " + "len=%d\n", tbf->tfi, tbf->llc_length); + gprs_rlcmac_debug_bw(tbf, tbf->llc_length); /* reset LLC frame */ tbf->llc_index = tbf->llc_length = 0; /* dequeue next LLC frame, if any */ - msg = msgb_dequeue(&tbf->llc_queue); + msg = llc_dequeue(tbf); if (msg) { LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " "TBF=%d (len=%d)\n", tbf->tfi, msg->len); @@ -1097,6 +1418,8 @@ do_resend: "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(tbf, GPRS_RLCMAC_FINISHED); break; } @@ -1121,28 +1444,37 @@ tx_block: len = tbf->rlc_block_len[index]; rh = (struct rlc_dl_header *)data; - /* Increment TX-counter */ - tbf->dir.dl.tx_counter++; - /* Clear Polling, if still set in history buffer */ rh->s_p = 0; - /* poll after ACK_AFTER_FRAMES frames, or when final block is tx. */ - if (rh->fbi == 1 || (tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) { - if (rh->fbi == 1) { + /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. + */ + if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { + if (first_fin_ack) { LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " - "polling, because final block sent.\n"); - } - if ((tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) { + "polling, because first final block sent.\n"); + } else { LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " "polling, because %d blocks sent.\n", - ACK_AFTER_FRAMES); + POLL_ACK_AFTER_FRAMES); } + /* scheduling not possible, because: */ if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) - LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " + LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " "sheduled for TBF=%d, so we must wait for " "requesting downlink ack\n", tbf->tfi); + else if (tbf->control_ts != ts) + LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " + "sheduled in this TS %d, waiting for " + "TS %d\n", ts, tbf->control_ts); + else if (sba_find(tbf->trx, 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); + tbf->dir.dl.tx_counter = 0; /* start timer whenever we send the final block */ if (rh->fbi == 1) tbf_timer_start(tbf, 3191, bts->t3191, 0); @@ -1154,7 +1486,13 @@ tx_block: /* set polling in header */ rh->rrbp = 0; /* N+13 */ rh->s_p = 1; /* Polling */ + + /* Increment TX-counter */ + tbf->dir.dl.tx_counter++; } + } else { + /* Increment TX-counter */ + tbf->dir.dl.tx_counter++; } /* return data block as message */ @@ -1189,8 +1527,8 @@ int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, } show_rbb[64] = '\0'; LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" - "(BSN=%d) 1=ACK o=NACK\n", ssn - 64, show_rbb, - ssn - 1); + "(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) */ @@ -1215,8 +1553,15 @@ int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, } } } else { - LOGP(DRLCMACDL, LOGL_DEBUG, "- ack range is out of " - "V(A)..V(S) range\n"); + /* 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 (DL TBF=%d) Free TFB!\n", + tbf->tfi); + return 1; /* indicate to free TBF */ } /* raise V(A), if possible */ @@ -1244,13 +1589,17 @@ int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, (tbf->dir.dl.v_s - 1) & mod_sns); - return 0; - } - - LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); + if (tbf->state == GPRS_RLCMAC_FINISHED + && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { + LOGP(DRLCMACDL, LOGL_NOTICE, "Received final block, " + "but without final ack inidcation\n"); + } else + return 0; + } else + LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); /* check for LLC PDU in the LLC Queue */ - msg = msgb_dequeue(&tbf->llc_queue); + msg = llc_dequeue(tbf); if (!msg) { struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; @@ -1259,7 +1608,7 @@ int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, "release.\n"); /* start T3193 */ tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, - bts->t3193_msec & 1000); + (bts->t3193_msec % 1000) * 1000); tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); return 0; @@ -1274,7 +1623,10 @@ int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " "because another LLC PDU has arrived in between\n"); memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ - gprs_rlcmac_trigger_downlink_assignment(tbf, 1, NULL); + tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ + tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); + tbf_update(tbf); + gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); return 0; } @@ -1283,20 +1635,43 @@ int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, struct msgb *gprs_rlcmac_send_packet_downlink_assignment( struct gprs_rlcmac_tbf *tbf, uint32_t fn) { + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; struct msgb *msg; struct gprs_rlcmac_tbf *new_tbf; + int poll_ass_dl = POLLING_ASSIGNMENT_DL; - if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { - LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " - "sheduled for TBF=%d, so we must wait for downlink " - "assignment...\n", tbf->tfi); + if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF + && tbf->control_ts != tbf->first_common_ts) { + LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " + "assigment, because MS cannot reply.\n"); + poll_ass_dl = 0; + } + if (poll_ass_dl) { + if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { + LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " + "for TBF=%d, so we must wait for downlink " + "assignment...\n", tbf->tfi); + return NULL; + } + if (sba_find(tbf->trx, tbf->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 (tbf->direction == GPRS_RLCMAC_UL_TBF) + if (tbf->direction == GPRS_RLCMAC_UL_TBF) { + /* be sure to check first, if contention resolution is done, + * otherwise we cannot send the assignment yet */ + if (!tbf->dir.ul.contention_resolution_done) { + LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " + "because contention resolution is not " + "finished.\n"); + return NULL; + } new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); - else + } else new_tbf = tbf; if (!new_tbf) { LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " @@ -1317,26 +1692,30 @@ struct msgb *gprs_rlcmac_send_packet_downlink_assignment( bitvec_unhex(ass_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Downlink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli); - RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); + RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); write_packet_downlink_assignment(mac_control_block, tbf->tfi, - (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf->tfi, - new_tbf->arfcn, new_tbf->ts, new_tbf->ta, new_tbf->tsc, - POLLING_ASSIGNMENT); + (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, + poll_ass_dl, bts->alpha, bts->gamma); 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); - free(mac_control_block); + talloc_free(mac_control_block); -#if POLLING_ASSIGNMENT == 1 - tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; - tbf->poll_fn = (fn + 13) % 2715648; - tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; -#else - tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; -#endif + if (poll_ass_dl) { + tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; + tbf->poll_fn = (fn + 13) % 2715648; + tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; + } else { + tbf->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 */ + tbf_timer_stop(new_tbf); + + } return msg; } @@ -1344,22 +1723,26 @@ struct msgb *gprs_rlcmac_send_packet_downlink_assignment( static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll, char *imsi) { + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; + int plen; + LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u TLLI: 0x%08x Immediate Assignment Downlink (PCH)\n", tbf->tfi, tbf->tlli); bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */ bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); /* use request reference that has maximum distance to current time, * so the assignment will not conflict with possible RACH requests. */ - int plen = write_immediate_assignment(immediate_assignment, 1, 125, (tbf->pdch->last_rts_fn + 21216) % 2715648, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, tbf->poll_fn); + plen = write_immediate_assignment(immediate_assignment, 1, 125, + (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, + tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, + tbf->poll_fn, 0, bts->alpha, bts->gamma); pcu_l1if_tx_pch(immediate_assignment, plen, imsi); bitvec_free(immediate_assignment); } /* depending on the current TBF, we assign on PACCH or AGCH */ -void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf, - uint8_t old_downlink, char *imsi) +void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_tbf *tbf, + struct gprs_rlcmac_tbf *old_tbf, char *imsi) { - gprs_rlcmac_tbf *old_tbf; - #ifdef DEBUG_DL_ASS_IDLE strncpy(debug_imsi, imsi); LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); @@ -1369,10 +1752,6 @@ void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf, tbf_timer_stop(tbf); /* check for downlink tbf: */ - if (old_downlink) - old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); - else - old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); if (old_tbf) { #ifdef DEBUG_DL_ASS_IDLE LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " @@ -1381,14 +1760,15 @@ void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf, tbf_timer_start(tbf, 1234, 1,0); #else LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " - "PACCH, because %slink TBF=%d exists for TLLI=0x%08x\n", - (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "down" : "up", - old_tbf->tfi, old_tbf->tlli); + "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", + (old_tbf->direction == GPRS_RLCMAC_UL_TBF) + ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; /* use TA from old TBF */ tbf->ta = old_tbf->ta; /* change state */ tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); /* start timer */ tbf_timer_start(tbf, 0, Tassign_pacch); #endif @@ -1398,12 +1778,53 @@ void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf, LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); return; } - /* send immediate assignment */ - gprs_rlcmac_downlink_assignment(tbf, 0, imsi); /* change state */ tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); - /* start timer */ + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); + strncpy(tbf->dir.dl.imsi, imsi, sizeof(tbf->dir.dl.imsi)); + /* send immediate assignment */ + gprs_rlcmac_downlink_assignment(tbf, 0, imsi); + tbf->dir.dl.wait_confirm = 1; + } +} + +int gprs_rlcmac_imm_ass_cnf(uint8_t *data, uint32_t fn) +{ + struct gprs_rlcmac_tbf *tbf; + uint8_t plen; + uint32_t tlli; + + /* move to IA Rest Octets */ + plen = data[0] >> 2; + data += 1 + plen; + + if ((*data & 0xf0) != 0xd0) { + LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest " + "octets do not start with bit sequence 'HH01' " + "(Packet Downlink Assignment)\n"); + return -EINVAL; + } + + /* get TLLI from downlink assignment */ + tlli = (*data++) << 28; + tlli |= (*data++) << 20; + tlli |= (*data++) << 12; + tlli |= (*data++) << 4; + tlli |= (*data++) >> 4; + + tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x " + "does not exit\n", tlli); + return -EINVAL; + } + + LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli); + + if (tbf->dir.dl.wait_confirm) { tbf_timer_start(tbf, 0, Tassign_agch); } - } + + return 0; +} |