Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
osmo-pcu/src/tbf_ul.cpp

792 lines
25 KiB

/* Copied from tbf.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
* Copyright (C) 2013 by Holger Hans Peter Freyther
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <bts.h>
#include <bts_pch_timer.h>
#include <tbf.h>
#include <tbf_ul.h>
#include <rlc.h>
#include <encoding.h>
#include <gprs_rlcmac.h>
#include <gprs_debug.h>
#include <gprs_bssgp_pcu.h>
#include <decoding.h>
#include <pcu_l1_if.h>
#include <gprs_ms.h>
#include <llc.h>
#include "pcu_utils.h"
extern "C" {
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/stats.h>
#include <osmocom/core/utils.h>
#include <osmocom/gprs/gprs_bssgp_bss.h>
#include <osmocom/gprs/protocol/gsm_08_18.h>
#include <osmocom/gsm/tlv.h>
#include "coding_scheme.h"
}
#include <errno.h>
#include <string.h>
/* After receiving these frames, we send ack/nack. */
#define SEND_ACK_AFTER_FRAMES 20
extern void *tall_pcu_ctx;
static const struct rate_ctr_desc tbf_ul_gprs_ctr_description[] = {
{ "gprs:uplink:cs1", "CS1 " },
{ "gprs:uplink:cs2", "CS2 " },
{ "gprs:uplink:cs3", "CS3 " },
{ "gprs:uplink:cs4", "CS4 " },
};
static const struct rate_ctr_desc tbf_ul_egprs_ctr_description[] = {
{ "egprs:uplink:mcs1", "MCS1 " },
{ "egprs:uplink:mcs2", "MCS2 " },
{ "egprs:uplink:mcs3", "MCS3 " },
{ "egprs:uplink:mcs4", "MCS4 " },
{ "egprs:uplink:mcs5", "MCS5 " },
{ "egprs:uplink:mcs6", "MCS6 " },
{ "egprs:uplink:mcs7", "MCS7 " },
{ "egprs:uplink:mcs8", "MCS8 " },
{ "egprs:uplink:mcs9", "MCS9 " },
};
static const struct rate_ctr_group_desc tbf_ul_gprs_ctrg_desc = {
"tbf:gprs",
"Data Blocks",
OSMO_STATS_CLASS_SUBSCRIBER,
ARRAY_SIZE(tbf_ul_gprs_ctr_description),
tbf_ul_gprs_ctr_description,
};
static const struct rate_ctr_group_desc tbf_ul_egprs_ctrg_desc = {
"tbf:egprs",
"Data Blocks",
OSMO_STATS_CLASS_SUBSCRIBER,
ARRAY_SIZE(tbf_ul_egprs_ctr_description),
tbf_ul_egprs_ctr_description,
};
gprs_rlcmac_ul_tbf::~gprs_rlcmac_ul_tbf()
{
osmo_fsm_inst_free(ul_ack_fsm.fi);
ul_ack_fsm.fi = NULL;
rate_ctr_group_free(m_ul_egprs_ctrs);
rate_ctr_group_free(m_ul_gprs_ctrs);
/* ~gprs_rlcmac_tbf() is called automatically upon return */
}
static int ul_tbf_dtor(struct gprs_rlcmac_ul_tbf *tbf)
{
tbf->~gprs_rlcmac_ul_tbf();
return 0;
}
/* Generic function to alloc a UL TBF, later configured to be assigned either over CCCH or PACCH */
struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts, GprsMs *ms, int8_t use_trx, bool single_slot)
{
struct gprs_rlcmac_ul_tbf *tbf;
int rc;
OSMO_ASSERT(ms != NULL);
LOGPMS(ms, DTBF, LOGL_DEBUG, "********** UL-TBF starts here **********\n");
LOGPMS(ms, DTBF, LOGL_INFO, "Allocating UL TBF\n");
tbf = talloc(tall_pcu_ctx, struct gprs_rlcmac_ul_tbf);
if (!tbf)
return NULL;
talloc_set_destructor(tbf, ul_tbf_dtor);
new (tbf) gprs_rlcmac_ul_tbf(bts, ms);
rc = tbf->setup(use_trx, single_slot);
/* if no resource */
if (rc < 0) {
talloc_free(tbf);
return NULL;
}
if (tbf->is_egprs_enabled())
tbf->set_window_size();
tbf->m_ul_egprs_ctrs = rate_ctr_group_alloc(tbf,
&tbf_ul_egprs_ctrg_desc, tbf->m_ctrs->idx);
tbf->m_ul_gprs_ctrs = rate_ctr_group_alloc(tbf,
&tbf_ul_gprs_ctrg_desc, tbf->m_ctrs->idx);
if (!tbf->m_ul_egprs_ctrs || !tbf->m_ul_gprs_ctrs) {
LOGPTBF(tbf, LOGL_ERROR, "Couldn't allocate TBF UL counters\n");
talloc_free(tbf);
return NULL;
}
llist_add_tail(tbf_trx_list(tbf), &tbf->trx->ul_tbfs);
bts_do_rate_ctr_inc(tbf->bts, CTR_TBF_UL_ALLOCATED);
return tbf;
}
/* Alloc a UL TBF to be assigned over PACCH. Called when an MS requests to
* create a new UL TBF during the end of life of a previous UL TBF (or an SBA).
* In summary, this TBF is allocated as a consequence of receiving a "Pkt
* Resource Req" or "Pkt Ctrl Ack" from the MS.
* See TS 44.060 9.3.2.4.2 "Non-extended uplink TBF mode".
*/
gprs_rlcmac_ul_tbf *tbf_alloc_ul_pacch(struct gprs_rlcmac_bts *bts, GprsMs *ms, int8_t use_trx)
{
struct gprs_rlcmac_ul_tbf *tbf;
tbf = tbf_alloc_ul_tbf(bts, ms, use_trx, false);
if (!tbf) {
LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n");
/* Caller will most probably send a Imm Ass Reject after return */
return NULL;
}
/* Contention resolution is considered to be done since TLLI is known in MS: */
tbf->m_contention_resolution_done = 1;
osmo_fsm_inst_dispatch(tbf->state_fsm.fi, TBF_EV_ASSIGN_ADD_PACCH, NULL);
return tbf;
}
/* Alloc a UL TBF to be assigned over CCCH. Used by request of a "One phase
* packet access", where MS requested only 1 PDCH TS (TS 44.018 Table 9.1.8.1). */
struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_ccch(struct gprs_rlcmac_bts *bts, struct GprsMs *ms)
{
struct gprs_rlcmac_ul_tbf *tbf;
tbf = tbf_alloc_ul_tbf(bts, ms, -1, true);
if (!tbf) {
LOGP(DTBF, LOGL_NOTICE, "No PDCH resource for Uplink TBF\n");
/* Caller will most probably send a Imm Ass Reject after return */
return NULL;
}
osmo_fsm_inst_dispatch(tbf->state_fsm.fi, TBF_EV_ASSIGN_ADD_CCCH, NULL);
tbf->contention_resolution_start();
OSMO_ASSERT(tbf->ms());
return tbf;
}
/* Create a temporary dummy TBF to Tx a ImmAssReject if allocating a new one during
* packet resource Request failed. This is similar as tbf_alloc_ul() but without
* calling tbf->setup() (in charge of TFI/USF allocation), and reusing resources
* from Packet Resource Request we received. See TS 44.060 sec 7.1.3.2.1 */
struct gprs_rlcmac_ul_tbf *handle_tbf_reject(struct gprs_rlcmac_bts *bts,
GprsMs *ms, uint8_t trx_no, uint8_t ts)
{
struct gprs_rlcmac_ul_tbf *ul_tbf = NULL;
struct gprs_rlcmac_trx *trx = &bts->trx[trx_no];
OSMO_ASSERT(ms);
ul_tbf = talloc(tall_pcu_ctx, struct gprs_rlcmac_ul_tbf);
if (!ul_tbf)
return ul_tbf;
talloc_set_destructor(ul_tbf, ul_tbf_dtor);
new (ul_tbf) gprs_rlcmac_ul_tbf(bts, ms);
ul_tbf->trx = trx;
/* The only one TS is the common, control TS */
ul_tbf->first_ts = ts;
ul_tbf->first_common_ts = ts;
tbf_assign_control_ts(ul_tbf);
ul_tbf->m_ctrs = rate_ctr_group_alloc(ul_tbf, &tbf_ctrg_desc, next_tbf_ctr_group_id++);
ul_tbf->m_ul_egprs_ctrs = rate_ctr_group_alloc(ul_tbf,
&tbf_ul_egprs_ctrg_desc,
ul_tbf->m_ctrs->idx);
ul_tbf->m_ul_gprs_ctrs = rate_ctr_group_alloc(ul_tbf,
&tbf_ul_gprs_ctrg_desc,
ul_tbf->m_ctrs->idx);
if (!ul_tbf->m_ctrs || !ul_tbf->m_ul_egprs_ctrs || !ul_tbf->m_ul_gprs_ctrs) {
LOGPTBF(ul_tbf, LOGL_ERROR, "Cound not allocate TBF UL rate counters\n");
talloc_free(ul_tbf);
return NULL;
}
tbf_update_state_fsm_name(ul_tbf);
ms_attach_tbf(ms, ul_tbf);
llist_add(tbf_trx_list((struct gprs_rlcmac_tbf *)ul_tbf), &trx->ul_tbfs);
bts_do_rate_ctr_inc(ul_tbf->bts, CTR_TBF_UL_ALLOCATED);
osmo_fsm_inst_dispatch(ul_tbf->state_fsm.fi, TBF_EV_ASSIGN_ADD_PACCH, NULL);
osmo_fsm_inst_dispatch(ul_tbf->ul_ass_fsm.fi, TBF_UL_ASS_EV_SCHED_ASS_REJ, NULL);
return ul_tbf;
}
gprs_rlcmac_ul_tbf::gprs_rlcmac_ul_tbf(struct gprs_rlcmac_bts *bts_, GprsMs *ms) :
gprs_rlcmac_tbf(bts_, ms, GPRS_RLCMAC_UL_TBF),
m_rx_counter(0),
m_contention_resolution_done(0),
m_ul_gprs_ctrs(NULL),
m_ul_egprs_ctrs(NULL)
{
memset(&m_usf, USF_INVALID, sizeof(m_usf));
memset(&ul_ack_fsm, 0, sizeof(ul_ack_fsm));
ul_ack_fsm.tbf = this;
ul_ack_fsm.fi = osmo_fsm_inst_alloc(&tbf_ul_ack_fsm, this, &ul_ack_fsm, LOGL_INFO, NULL);
}
/*
* Store received block data in LLC message(s) and forward to SGSN
* if complete.
*/
int gprs_rlcmac_ul_tbf::assemble_forward_llc(const gprs_rlc_data *_data)
{
const uint8_t *data = _data->block;
uint8_t len = _data->len;
const struct gprs_rlc_data_block_info *rdbi = &_data->block_info;
enum CodingScheme cs = _data->cs_last;
Decoding::RlcData frames[16], *frame;
int i, num_frames = 0;
uint32_t dummy_tlli;
LOGPTBFUL(this, LOGL_DEBUG, "Assembling frames: (len=%d)\n", len);
num_frames = Decoding::rlc_data_from_ul_data(
rdbi, cs, data, &(frames[0]), ARRAY_SIZE(frames),
&dummy_tlli);
/* create LLC frames */
for (i = 0; i < num_frames; i++) {
frame = frames + i;
if (frame->length) {
bts_do_rate_ctr_add(bts, CTR_RLC_UL_PAYLOAD_BYTES, frame->length);
LOGPTBFUL(this, LOGL_DEBUG, "Frame %d "
"starts at offset %d, "
"length=%d, is_complete=%d\n",
i + 1, frame->offset, frame->length,
frame->is_complete);
m_llc.append_frame(data + frame->offset, frame->length);
llc_consume(&m_llc, frame->length);
}
if (frame->is_complete) {
/* send frame to SGSN */
LOGPTBFUL(this, LOGL_DEBUG, "complete UL frame len=%d\n", llc_frame_length(&m_llc));
snd_ul_ud();
bts_do_rate_ctr_add(bts, CTR_LLC_UL_BYTES, llc_frame_length(&m_llc));
m_llc.reset();
}
}
return 0;
}
void gprs_rlcmac_ul_tbf::contention_resolution_start()
{
/* 3GPP TS 44.018 sec 11.1.2 Timers on the network side: "This timer is
* started when a temporary block flow is allocated with an IMMEDIATE
* ASSIGNMENT or an IMMEDIATE PACKET ASSIGNMENT or an EC IMMEDIATE
* ASSIGNMENT TYPE 1 message during a packet access procedure. It is
* stopped when the mobile station has correctly seized the temporary
* block flow."
* In our code base, it means we want to do contention resolution
* timeout only for one-phase packet access, since two-phase is handled
* through SBA structs, which are freed by the PDCH UL Controller if the
* single allocated block is lost. */
T_START(this, T3141, 3141, "Contention resolution (UL-TBF, CCCH)", true);
}
void gprs_rlcmac_ul_tbf::contention_resolution_success()
{
if (m_contention_resolution_done)
return;
/* 3GPP TS 44.060 sec 7a.2.1 Contention Resolution */
/* 3GPP TS 44.018 3.5.2.1.4 Packet access completion: The one phase
packet access procedure is completed at a successful contention
resolution. The mobile station has entered the packet transfer mode.
Timer T3141 is stopped on the network side */
t_stop(T3141, "Contention resolution success (UL-TBF, CCCH)");
/* now we must set this flag, so we are allowed to assign downlink
* TBF on PACCH. it is only allowed when TLLI is acknowledged. */
m_contention_resolution_done = 1;
bts_do_rate_ctr_inc(bts, CTR_IMMEDIATE_ASSIGN_UL_TBF_CONTENTION_RESOLUTION_SUCCESS);
}
/*! \brief receive data from PDCH/L1 */
int gprs_rlcmac_ul_tbf::rcv_data_block_acknowledged(
const struct gprs_rlc_data_info *rlc,
uint8_t *data, struct pcu_l1_meas *meas)
{
const struct gprs_rlc_data_block_info *rdbi;
struct gprs_rlc_data *block;
int8_t rssi = meas->have_rssi ? meas->rssi : 0;
const uint16_t ws = m_window.ws();
LOGPTBFUL(this, LOGL_DEBUG, "UL DATA TFI=%d received (V(Q)=%d .. "
"V(R)=%d)\n", rlc->tfi, this->m_window.v_q(),
this->m_window.v_r());
/* process RSSI */
gprs_rlcmac_rssi(this, rssi);
/* store measurement values */
ms_update_l1_meas(ms(), meas);
uint32_t new_tlli = GSM_RESERVED_TMSI;
unsigned int block_idx;
/* Increment RX-counter */
this->m_rx_counter++;
update_coding_scheme_counter_ul(rlc->cs);
/* Loop over num_blocks */
for (block_idx = 0; block_idx < rlc->num_data_blocks; block_idx++) {
int num_chunks;
uint8_t *rlc_data;
rdbi = &rlc->block_info[block_idx];
LOGPTBFUL(this, LOGL_DEBUG,
"Got %s RLC data block: CV=%d, BSN=%d, SPB=%d, PI=%d, E=%d, TI=%d, bitoffs=%d\n",
mcs_name(rlc->cs),
rdbi->cv, rdbi->bsn, rdbi->spb,
rdbi->pi, rdbi->e, rdbi->ti,
rlc->data_offs_bits[block_idx]);
/* Check whether the block needs to be decoded */
if (!m_window.is_in_window(rdbi->bsn)) {
LOGPTBFUL(this, LOGL_DEBUG, "BSN %d out of window %d..%d (it's normal)\n",
rdbi->bsn,
m_window.v_q(), m_window.mod_sns(m_window.v_q() + ws - 1));
continue;
} else if (m_window.is_received(rdbi->bsn)) {
LOGPTBFUL(this, LOGL_DEBUG,
"BSN %d already received\n", rdbi->bsn);
continue;
}
/* Store block and meta info to BSN buffer */
LOGPTBFUL(this, LOGL_DEBUG, "BSN %d storing in window (%d..%d)\n",
rdbi->bsn, m_window.v_q(),
m_window.mod_sns(m_window.v_q() + ws - 1));
block = m_rlc.block(rdbi->bsn);
OSMO_ASSERT(rdbi->data_len <= sizeof(block->block));
rlc_data = &(block->block[0]);
if (rdbi->spb) {
egprs_rlc_ul_reseg_bsn_state assemble_status;
assemble_status = handle_egprs_ul_spb(rlc,
block, data, block_idx);
if (assemble_status != EGPRS_RESEG_DEFAULT)
return 0;
} else {
block->block_info = *rdbi;
block->cs_last = rlc->cs;
block->len =
Decoding::rlc_copy_to_aligned_buffer(rlc,
block_idx, data, rlc_data);
}
LOGPTBFUL(this, LOGL_DEBUG,
"data_length=%d, data=%s\n",
block->len, osmo_hexdump(rlc_data, block->len));
/* Get/Handle TLLI */
if (rdbi->ti) {
num_chunks = Decoding::rlc_data_from_ul_data(
rdbi, rlc->cs, rlc_data, NULL, 0, &new_tlli);
if (num_chunks < 0) {
bts_do_rate_ctr_inc(bts, CTR_DECODE_ERRORS);
LOGPTBFUL(this, LOGL_NOTICE,
"Failed to decode TLLI of %s UL DATA TFI=%d.\n",
mcs_name(rlc->cs), rlc->tfi);
m_window.invalidate_bsn(rdbi->bsn);
continue;
}
if (!this->is_tlli_valid()) {
if (new_tlli == GSM_RESERVED_TMSI) {
LOGPTBFUL(this, LOGL_NOTICE,
"TLLI is 0x%08x within UL DATA?!?\n",
new_tlli);
m_window.invalidate_bsn(rdbi->bsn);
continue;
}
LOGPTBFUL(this, LOGL_INFO,
"Decoded premier TLLI=0x%08x of UL DATA TFI=%d.\n",
new_tlli, rlc->tfi);
update_ms(new_tlli, GPRS_RLCMAC_UL_TBF);
bts_pch_timer_stop(bts, ms());
} else if (new_tlli != GSM_RESERVED_TMSI && new_tlli != tlli()) {
LOGPTBFUL(this, LOGL_NOTICE,
"Decoded TLLI=%08x mismatch on UL DATA TFI=%d. (Ignoring due to contention resolution)\n",
new_tlli, rlc->tfi);
m_window.invalidate_bsn(rdbi->bsn);
continue;
}
} else if (!is_tlli_valid()) {
LOGPTBFUL(this, LOGL_NOTICE, "Missing TLLI within UL DATA.\n");
m_window.invalidate_bsn(rdbi->bsn);
continue;
}
m_window.receive_bsn(rdbi->bsn);
}
/* 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 = m_window.v_q();
const uint16_t count = m_window.raise_v_q();
/* Retrieve LLC frames from blocks that are ready */
for (uint16_t i = 0; i < count; ++i) {
uint16_t index = m_window.mod_sns(v_q_beg + i);
assemble_forward_llc(m_rlc.block(index));
}
/* Last frame in buffer: */
block = m_rlc.block(m_window.mod_sns(m_window.v_r() - 1));
rdbi = &block->block_info;
/* Check if we already received all data TBF had to send: */
if (this->state_is(TBF_ST_FLOW) /* still in flow state */
&& this->m_window.v_q() == this->m_window.v_r() /* if complete */
&& block->len) { /* if there was ever a last block received */
LOGPTBFUL(this, LOGL_DEBUG,
"No gaps in received block, last block: BSN=%d CV=%d\n",
rdbi->bsn, rdbi->cv);
if (rdbi->cv == 0) {
LOGPTBFUL(this, LOGL_DEBUG, "Finished with UL TBF\n");
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_LAST_UL_DATA_RECVD, NULL);
/* Reset N3103 counter. */
this->n_reset(N3103);
}
}
/* If TLLI is included or if we received half of the window, we send
* an ack/nack */
maybe_schedule_uplink_acknack(rlc, block->len && rdbi->cv == 0);
return 0;
}
void gprs_rlcmac_ul_tbf::maybe_schedule_uplink_acknack(
const gprs_rlc_data_info *rlc, bool countdown_finished)
{
bool require_ack = false;
bool have_ti = rlc->block_info[0].ti ||
(rlc->num_data_blocks > 1 && rlc->block_info[1].ti);
if (rlc->si) {
require_ack = true;
LOGPTBFUL(this, LOGL_NOTICE,
"Scheduling Ack/Nack, because MS is stalled.\n");
}
if (have_ti) {
require_ack = true;
LOGPTBFUL(this, LOGL_DEBUG,
"Scheduling Ack/Nack, because TLLI is included.\n");
}
if (countdown_finished) {
require_ack = true;
if (state_is(TBF_ST_FLOW))
LOGPTBFUL(this, LOGL_DEBUG,
"Scheduling Ack/Nack, because some data is missing and last block has CV==0.\n");
else if (state_is(TBF_ST_FINISHED))
LOGPTBFUL(this, LOGL_DEBUG,
"Scheduling final Ack/Nack, because all data was received and last block has CV==0.\n");
}
if ((m_rx_counter % SEND_ACK_AFTER_FRAMES) == 0) {
require_ack = true;
LOGPTBFUL(this, LOGL_DEBUG,
"Scheduling Ack/Nack, because %d frames received.\n",
SEND_ACK_AFTER_FRAMES);
}
if (!require_ack)
return;
osmo_fsm_inst_dispatch(this->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
}
/* Send Uplink unit-data to SGSN. */
int gprs_rlcmac_ul_tbf::snd_ul_ud()
{
uint8_t qos_profile[3];
struct msgb *llc_pdu;
unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + llc_frame_length(&m_llc);
struct bssgp_bvc_ctx *bctx = bts->pcu->bssgp.bctx;
LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] %s len=%d\n", tbf_name(this), llc_frame_length(&m_llc));
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)*llc_frame_length(&m_llc)));
tl16v_put(buf, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*llc_frame_length(&m_llc), 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;
}
egprs_rlc_ul_reseg_bsn_state gprs_rlcmac_ul_tbf::handle_egprs_ul_second_seg(
const struct gprs_rlc_data_info *rlc, struct gprs_rlc_data *block,
uint8_t *data, const uint8_t block_idx)
{
const gprs_rlc_data_block_info *rdbi = &rlc->block_info[block_idx];
union split_block_status *spb_status = &block->spb_status;
uint8_t *rlc_data = &block->block[0];
bts_do_rate_ctr_inc(bts, CTR_SPB_UL_SECOND_SEGMENT);
if (spb_status->block_status_ul &
EGPRS_RESEG_FIRST_SEG_RXD) {
LOGPTBFUL(this, LOGL_DEBUG,
"Second seg is received first seg is already present set the status to complete\n");
spb_status->block_status_ul = EGPRS_RESEG_DEFAULT;
block->len += Decoding::rlc_copy_to_aligned_buffer(rlc,
block_idx, data, rlc_data + block->len);
block->block_info.data_len += rdbi->data_len;
} else if (spb_status->block_status_ul == EGPRS_RESEG_DEFAULT) {
LOGPTBFUL(this, LOGL_DEBUG,
"Second seg is received first seg is not received set the status to second seg received\n");
block->len = Decoding::rlc_copy_to_aligned_buffer(rlc,
block_idx, data,
rlc_data + rlc->block_info[block_idx].data_len);
spb_status->block_status_ul = EGPRS_RESEG_SECOND_SEG_RXD;
block->block_info = *rdbi;
}
return spb_status->block_status_ul;
}
egprs_rlc_ul_reseg_bsn_state gprs_rlcmac_ul_tbf::handle_egprs_ul_first_seg(
const struct gprs_rlc_data_info *rlc, struct gprs_rlc_data *block,
uint8_t *data, const uint8_t block_idx)
{
const gprs_rlc_data_block_info *rdbi = &rlc->block_info[block_idx];
uint8_t *rlc_data = &block->block[0];
union split_block_status *spb_status = &block->spb_status;
bts_do_rate_ctr_inc(bts, CTR_SPB_UL_FIRST_SEGMENT);
if (spb_status->block_status_ul & EGPRS_RESEG_SECOND_SEG_RXD) {
LOGPTBFUL(this, LOGL_DEBUG,
"First seg is received second seg is already present set the status to complete\n");
block->len += Decoding::rlc_copy_to_aligned_buffer(rlc,
block_idx, data, rlc_data);
block->block_info.data_len = block->len;
spb_status->block_status_ul = EGPRS_RESEG_DEFAULT;
} else if (spb_status->block_status_ul == EGPRS_RESEG_DEFAULT) {
LOGPTBFUL(this, LOGL_DEBUG,
"First seg is received second seg is not received set the status to first seg received\n");
spb_status->block_status_ul = EGPRS_RESEG_FIRST_SEG_RXD;
block->len = Decoding::rlc_copy_to_aligned_buffer(rlc,
block_idx, data, rlc_data);
block->block_info = *rdbi;
}
return spb_status->block_status_ul;
}
egprs_rlc_ul_reseg_bsn_state gprs_rlcmac_ul_tbf::handle_egprs_ul_spb(
const struct gprs_rlc_data_info *rlc, struct gprs_rlc_data *block,
uint8_t *data, const uint8_t block_idx)
{
const gprs_rlc_data_block_info *rdbi = &rlc->block_info[block_idx];
LOGPTBFUL(this, LOGL_DEBUG,
"Got SPB(%d) cs(%s) data block with BSN (%d), TFI(%d).\n",
rdbi->spb, mcs_name(rlc->cs), rdbi->bsn, rlc->tfi);
egprs_rlc_ul_reseg_bsn_state assemble_status = EGPRS_RESEG_INVALID;
/* Section 10.4.8b of 44.060*/
if (rdbi->spb == 2)
assemble_status = handle_egprs_ul_first_seg(rlc,
block, data, block_idx);
else if (rdbi->spb == 3)
assemble_status = handle_egprs_ul_second_seg(rlc,
block, data, block_idx);
else {
LOGPTBFUL(this, LOGL_ERROR,
"spb(%d) Not supported SPB for this EGPRS configuration\n",
rdbi->spb);
}
/*
* When the block is successfully constructed out of segmented blocks
* upgrade the MCS to the type 2
*/
if (assemble_status == EGPRS_RESEG_DEFAULT) {
switch (rlc->cs) {
case MCS3 :
block->cs_last = MCS6;
LOGPTBFUL(this, LOGL_DEBUG, "Upgrading to MCS6\n");
break;
case MCS2 :
block->cs_last = MCS5;
LOGPTBFUL(this, LOGL_DEBUG, "Upgrading to MCS5\n");
break;
case MCS1 :
LOGPTBFUL(this, LOGL_DEBUG, "Upgrading to MCS4\n");
block->cs_last = MCS4;
break;
default:
LOGPTBFUL(this, LOGL_ERROR,
"cs(%s) Error in Upgrading to higher MCS\n",
mcs_name(rlc->cs));
break;
}
}
return assemble_status;
}
void gprs_rlcmac_ul_tbf::update_coding_scheme_counter_ul(enum CodingScheme cs)
{
switch (cs) {
case CS1:
bts_do_rate_ctr_inc(bts, CTR_GPRS_UL_CS1);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_gprs_ctrs, TBF_CTR_GPRS_UL_CS1));
break;
case CS2:
bts_do_rate_ctr_inc(bts, CTR_GPRS_UL_CS2);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_gprs_ctrs, TBF_CTR_GPRS_UL_CS2));
break;
case CS3:
bts_do_rate_ctr_inc(bts, CTR_GPRS_UL_CS3);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_gprs_ctrs, TBF_CTR_GPRS_UL_CS3));
break;
case CS4:
bts_do_rate_ctr_inc(bts, CTR_GPRS_UL_CS4);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_gprs_ctrs, TBF_CTR_GPRS_UL_CS4));
break;
case MCS1:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS1);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS1));
break;
case MCS2:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS2);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS2));
break;
case MCS3:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS3);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS3));
break;
case MCS4:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS4);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS4));
break;
case MCS5:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS5);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS5));
break;
case MCS6:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS6);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS6));
break;
case MCS7:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS7);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS7));
break;
case MCS8:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS8);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS8));
break;
case MCS9:
bts_do_rate_ctr_inc(bts, CTR_EGPRS_UL_MCS9);
rate_ctr_inc(rate_ctr_group_get_ctr(m_ul_egprs_ctrs, TBF_CTR_EGPRS_UL_MCS9));
break;
default:
LOGPTBFUL(this, LOGL_ERROR, "attempting to update rate counters for unsupported (M)CS %s\n",
mcs_name(cs));
}
}
void gprs_rlcmac_ul_tbf::set_window_size()
{
const struct gprs_rlcmac_bts *b = bts;
uint16_t ws = egprs_window_size(b, ul_slots());
LOGPTBFUL(this, LOGL_INFO, "setting EGPRS UL window size to %u, base(%u) slots(%u) ws_pdch(%u)\n",
ws, bts->pcu->vty.ws_base, pcu_bitcount(ul_slots()), bts->pcu->vty.ws_pdch);
m_window.set_ws(ws);
}
gprs_rlc_window *gprs_rlcmac_ul_tbf::window()
{
return &m_window;
}
void gprs_rlcmac_ul_tbf::usf_timeout()
{
if (n_inc(N3101))
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_MAX_N3101, NULL);
}
struct gprs_rlcmac_ul_tbf *as_ul_tbf(struct gprs_rlcmac_tbf *tbf)
{
if (tbf && tbf->direction == GPRS_RLCMAC_UL_TBF)
return static_cast<gprs_rlcmac_ul_tbf *>(tbf);
else
return NULL;
}
void tbf_usf_timeout(struct gprs_rlcmac_ul_tbf *tbf)
{
tbf->usf_timeout();
}
bool ul_tbf_contention_resolution_done(const struct gprs_rlcmac_ul_tbf *tbf)
{
return tbf->m_contention_resolution_done;
}
struct osmo_fsm_inst *tbf_ul_ack_fi(const struct gprs_rlcmac_ul_tbf *tbf)
{
return tbf->ul_ack_fsm.fi;
}
void ul_tbf_contention_resolution_success(struct gprs_rlcmac_ul_tbf *tbf)
{
return tbf->contention_resolution_success();
}