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osmo-pcu/src/bts.cpp

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/*
* Copyright (C) 2013 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <bts.h>
#include <poll_controller.h>
#include <tbf.h>
#include <encoding.h>
#include <decoding.h>
#include <rlc.h>
#include <pcu_l1_if.h>
#include <gprs_rlcmac.h>
#include <gprs_debug.h>
extern "C" {
#include <osmocom/core/talloc.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/stats.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
}
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
extern void *tall_pcu_ctx;
static BTS s_bts;
/**
* For gcc-4.4 compat do not use extended initializer list but keep the
* order from the enum here. Once we support GCC4.7 and up we can change
* the code below.
*/
static const struct rate_ctr_desc bts_ctr_description[] = {
{ "tbf.dl.alloc", "TBF DL Allocated "},
{ "tbf.dl.freed", "TBF DL Freed "},
{ "tbf.dl.aborted", "TBF DL Aborted "},
{ "tbf.ul.alloc", "TBF UL Allocated "},
{ "tbf.ul.freed", "TBF UL Freed "},
{ "tbf.ul.aborted", "TBF UL Aborted "},
{ "tbf.reused", "TBF Reused "},
{ "tbf.alloc.algo-a", "TBF Alloc Algo A "},
{ "tbf.alloc.algo-b", "TBF Alloc Algo B "},
{ "tbf.failed.egprs-only", "TBF Failed EGPRS-only"},
{ "rlc.sent", "RLC Sent "},
{ "rlc.resent", "RLC Resent "},
{ "rlc.restarted", "RLC Restarted "},
{ "rlc.stalled", "RLC Stalled "},
{ "rlc.nacked", "RLC Nacked "},
{ "rlc.final_block_resent", "RLC Final Blk resent "},
{ "rlc.ass.timedout", "RLC Assign Timeout "},
{ "rlc.ass.failed", "RLC Assign Failed "},
{ "rlc.ack.timedout", "RLC Ack Timeout "},
{ "rlc.ack.failed", "RLC Ack Failed "},
{ "rlc.rel.timedout", "RLC Release Timeout "},
{ "rlc.late-block", "RLC Late Block "},
{ "rlc.sent-dummy", "RLC Sent Dummy "},
{ "rlc.sent-control", "RLC Sent Control "},
{ "rlc.dl_bytes", "RLC DL Bytes "},
{ "rlc.dl_payload_bytes", "RLC DL Payload Bytes "},
{ "rlc.ul_bytes", "RLC UL Bytes "},
{ "rlc.ul_payload_bytes", "RLC UL Payload Bytes "},
{ "decode.errors", "Decode Errors "},
{ "sba.allocated", "SBA Allocated "},
{ "sba.freed", "SBA Freed "},
{ "sba.timedout", "SBA Timeout "},
{ "llc.timeout", "Timedout Frames "},
{ "llc.dropped", "Dropped Frames "},
{ "llc.scheduled", "Scheduled Frames "},
{ "llc.dl_bytes", "RLC encapsulated PDUs"},
{ "llc.ul_bytes", "full PDUs received "},
{ "rach.requests", "RACH requests "},
{ "11bit_rach.requests", "11BIT_RACH requests "},
{ "spb.uplink_first_segment", "First seg of UL SPB "},
{ "spb.uplink_second_segment", "Second seg of UL SPB "},
{ "spb.downlink_first_segment", "First seg of DL SPB "},
{ "spb.downlink_second_segment","Second seg of DL SPB "},
{ "immediate.assignment_UL", "Immediate Assign UL "},
{ "immediate.assignment_rej", "Immediate Assign Rej "},
{ "immediate.assignment_DL", "Immediate Assign DL "},
{ "channel.request_description","Channel Request Desc "},
{ "pkt.ul_assignment", "Packet UL Assignment "},
{ "pkt.access_reject", "Packet Access Reject "},
{ "pkt.dl_assignment", "Packet DL Assignment "},
{ "ul.control", "UL control Block "},
{ "ul.assignment_poll_timeout", "UL Assign Timeout "},
{ "ul.assignment_failed", "UL Assign Failed "},
{ "dl.assignment_timeout", "DL Assign Timeout "},
{ "dl.assignment_failed", "DL Assign Failed "},
{ "pkt.ul_ack_nack_timeout", "PUAN Poll Timeout "},
{ "pkt.ul_ack_nack_failed", "PUAN poll Failed "},
{ "pkt.dl_ack_nack_timeout", "PDAN poll Timeout "},
{ "pkt.dl_ack_nack_failed", "PDAN poll Failed "},
{ "gprs.downlink_cs1", "CS1 downlink "},
{ "gprs.downlink_cs2", "CS2 downlink "},
{ "gprs.downlink_cs3", "CS3 downlink "},
{ "gprs.downlink_cs4", "CS4 downlink "},
{ "egprs.downlink_mcs1", "MCS1 downlink "},
{ "egprs.downlink_mcs2", "MCS2 downlink "},
{ "egprs.downlink_mcs3", "MCS3 downlink "},
{ "egprs.downlink_mcs4", "MCS4 downlink "},
{ "egprs.downlink_mcs5", "MCS5 downlink "},
{ "egprs.downlink_mcs6", "MCS6 downlink "},
{ "egprs.downlink_mcs7", "MCS7 downlink "},
{ "egprs.downlink_mcs8", "MCS8 downlink "},
{ "egprs.downlink_mcs9", "MCS9 downlink "},
{ "gprs.uplink_cs1", "CS1 Uplink "},
{ "gprs.uplink_cs2", "CS2 Uplink "},
{ "gprs.uplink_cs3", "CS3 Uplink "},
{ "gprs.uplink_cs4", "CS4 Uplink "},
{ "egprs.uplink_mcs1", "MCS1 Uplink "},
{ "egprs.uplink_mcs2", "MCS2 Uplink "},
{ "egprs.uplink_mcs3", "MCS3 Uplink "},
{ "egprs.uplink_mcs4", "MCS4 Uplink "},
{ "egprs.uplink_mcs5", "MCS5 Uplink "},
{ "egprs.uplink_mcs6", "MCS6 Uplink "},
{ "egprs.uplink_mcs7", "MCS7 Uplink "},
{ "egprs.uplink_mcs8", "MCS8 Uplink "},
{ "egprs.uplink_mcs9", "MCS9 Uplink "},
};
static const struct rate_ctr_group_desc bts_ctrg_desc = {
"bts",
"BTS Statistics",
OSMO_STATS_CLASS_GLOBAL,
ARRAY_SIZE(bts_ctr_description),
bts_ctr_description,
};
static const struct osmo_stat_item_desc bts_stat_item_description[] = {
{ "ms.present", "MS Present ",
OSMO_STAT_ITEM_NO_UNIT, 4, 0},
};
static const struct osmo_stat_item_group_desc bts_statg_desc = {
"bts",
"BTS Statistics",
OSMO_STATS_CLASS_GLOBAL,
ARRAY_SIZE(bts_stat_item_description),
bts_stat_item_description,
};
BTS* BTS::main_bts()
{
return &s_bts;
}
struct gprs_rlcmac_bts *BTS::bts_data()
{
return &m_bts;
}
struct gprs_rlcmac_bts *bts_main_data()
{
return BTS::main_bts()->bts_data();
}
struct rate_ctr_group *bts_main_data_stats()
{
return BTS::main_bts()->rate_counters();
}
BTS::BTS()
: m_cur_fn(0)
, m_cur_blk_fn(-1)
, m_pollController(*this)
, m_sba(*this)
, m_ms_store(this)
{
memset(&m_bts, 0, sizeof(m_bts));
m_bts.bts = this;
/* initialize back pointers */
for (size_t trx_no = 0; trx_no < ARRAY_SIZE(m_bts.trx); ++trx_no) {
struct gprs_rlcmac_trx *trx = &m_bts.trx[trx_no];
trx->trx_no = trx_no;
trx->bts = this;
for (size_t ts_no = 0; ts_no < ARRAY_SIZE(trx->pdch); ++ts_no) {
struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no];
pdch->ts_no = ts_no;
pdch->trx = trx;
}
}
m_ratectrs = rate_ctr_group_alloc(tall_pcu_ctx, &bts_ctrg_desc, 0);
m_statg = osmo_stat_item_group_alloc(tall_pcu_ctx, &bts_statg_desc, 0);
}
BTS::~BTS()
{
/* this can cause counter updates and must not be left to the
* m_ms_store's destructor */
m_ms_store.cleanup();
rate_ctr_group_free(m_ratectrs);
osmo_stat_item_group_free(m_statg);
}
void BTS::set_current_frame_number(int fn)
{
/* The UL frame numbers lag 3 behind the DL frames and the data
* indication is only sent after all 4 frames of the block have been
* received. Sometimes there is an idle frame between the end of one
* and start of another frame (every 3 blocks). So the timeout should
* definitely be there if we're more than 8 frames past poll_fn. Let's
* stay on the safe side and say 13 or more. An additional delay can
* happen due to the block processing time in the DSP, so the delay of
* decoded blocks relative to the timing clock can be much larger.
* Values up to 50 frames have been observed under load. */
const static int max_delay = 60;
m_cur_fn = fn;
m_pollController.expireTimedout(m_cur_fn, max_delay);
}
void BTS::set_current_block_frame_number(int fn, unsigned max_delay)
{
int delay = 0;
const int late_block_delay_thresh = 13;
const int fn_update_ok_min_delay = -500;
const int fn_update_ok_max_delay = 0;
/* frame numbers in the received blocks are assumed to be strongly
* monotonic. */
if (m_cur_blk_fn >= 0) {
int delta = (fn + 2715648 * 3 / 2 - m_cur_blk_fn) % 2715648 - 2715648/2;
if (delta <= 0)
return;
}
/* Check block delay vs. the current frame number */
if (current_frame_number() != 0)
delay = (fn + 2715648 * 3 / 2 - current_frame_number()) % 2715648
- 2715648/2;
if (delay <= -late_block_delay_thresh) {
LOGP(DRLCMAC, LOGL_NOTICE,
"Late RLC block, FN delta: %d FN: %d curFN: %d\n",
delay, fn, current_frame_number());
rlc_late_block();
}
m_cur_blk_fn = fn;
if (delay < fn_update_ok_min_delay || delay > fn_update_ok_max_delay ||
current_frame_number() == 0)
m_cur_fn = fn;
m_pollController.expireTimedout(fn, max_delay);
}
int BTS::add_paging(uint8_t chan_needed, uint8_t *identity_lv)
{
uint8_t l, trx, ts, any_tbf = 0;
struct gprs_rlcmac_tbf *tbf;
LListHead<gprs_rlcmac_tbf> *pos;
struct gprs_rlcmac_paging *pag;
uint8_t slot_mask[8];
int8_t first_ts; /* must be signed */
LListHead<gprs_rlcmac_tbf> *tbfs_lists[] = {
&m_ul_tbfs,
&m_dl_tbfs,
NULL
};
LOGP(DRLCMAC, LOGL_INFO, "Add RR paging: chan-needed=%d MI=%s\n",
chan_needed, osmo_hexdump(identity_lv + 1, identity_lv[0]));
/* collect slots to page
* Mark slots for every TBF, but only mark one of it.
* Mark only the first slot found.
* Don't mark, if TBF uses a different slot that is already marked. */
memset(slot_mask, 0, sizeof(slot_mask));
for (l = 0; tbfs_lists[l]; l++) {
llist_for_each(pos, tbfs_lists[l]) {
tbf = pos->entry();
first_ts = -1;
for (ts = 0; ts < 8; ts++) {
if (tbf->pdch[ts]) {
/* remember the first slot found */
if (first_ts < 0)
first_ts = ts;
/* break, if we already marked a slot */
if ((slot_mask[tbf->trx->trx_no] & (1 << ts)))
break;
}
}
/* mark first slot found, if none is marked already */
if (ts == 8 && first_ts >= 0) {
LOGP(DRLCMAC, LOGL_DEBUG, "- %s uses "
"TRX=%d TS=%d, so we mark\n",
tbf_name(tbf),
tbf->trx->trx_no, first_ts);
slot_mask[tbf->trx->trx_no] |= (1 << first_ts);
} else
LOGP(DRLCMAC, LOGL_DEBUG, "- %s uses "
"already marked TRX=%d TS=%d\n",
tbf_name(tbf),
tbf->trx->trx_no, ts);
}
}
/* Now we have a list of marked slots. Every TBF uses at least one
* of these slots. */
/* schedule paging to all marked slots */
for (trx = 0; trx < 8; trx++) {
if (slot_mask[trx] == 0)
continue;
for (ts = 0; ts < 8; ts++) {
if ((slot_mask[trx] & (1 << ts))) {
/* schedule */
pag = talloc_zero(tall_pcu_ctx,
struct gprs_rlcmac_paging);
if (!pag)
return -ENOMEM;
pag->chan_needed = chan_needed;
memcpy(pag->identity_lv, identity_lv,
identity_lv[0] + 1);
m_bts.trx[trx].pdch[ts].add_paging(pag);
LOGP(DRLCMAC, LOGL_INFO, "Paging on PACCH of "
"TRX=%d TS=%d\n", trx, ts);
any_tbf = 1;
}
}
}
if (!any_tbf)
LOGP(DRLCMAC, LOGL_INFO, "No paging, because no TBF\n");
return 0;
}
gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
{
struct gprs_rlcmac_dl_tbf *tbf;
LListHead<gprs_rlcmac_tbf> *pos;
/* 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(pos, &m_dl_tbfs) {
tbf = as_dl_tbf(pos->entry());
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
&& tbf->poll_fn == fn && tbf->trx->trx_no == trx
&& tbf->poll_ts == ts) {
return tbf;
}
}
return NULL;
}
gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
{
struct gprs_rlcmac_ul_tbf *tbf;
LListHead<gprs_rlcmac_tbf> *pos;
/* 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(pos, &m_ul_tbfs) {
tbf = as_ul_tbf(pos->entry());
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
&& tbf->poll_fn == fn && tbf->trx->trx_no == trx
&& tbf->poll_ts == ts) {
return tbf;
}
}
return NULL;
}
/* lookup downlink TBF Entity (by TFI) */
gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts)
{
if (trx >= 8 || ts >= 8)
return NULL;
return m_bts.trx[trx].pdch[ts].dl_tbf_by_tfi(tfi);
}
/* lookup uplink TBF Entity (by TFI) */
gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts)
{
if (trx >= 8 || ts >= 8)
return NULL;
return m_bts.trx[trx].pdch[ts].ul_tbf_by_tfi(tfi);
}
/*
* Search for free TFI and return TFI, TRX.
* This method returns the first TFI that is currently not used in any PDCH of
* a TRX. The first TRX that contains such an TFI is returned. Negative values
* indicate errors.
*/
int BTS::tfi_find_free(enum gprs_rlcmac_tbf_direction dir,
uint8_t *_trx, int8_t use_trx)
{
struct gprs_rlcmac_pdch *pdch;
uint32_t free_tfis;
bool has_pdch = false;
uint8_t trx_from, trx_to, trx, ts, tfi;
if (use_trx >= 0 && use_trx < 8)
trx_from = trx_to = use_trx;
else {
trx_from = 0;
trx_to = 7;
}
/* find a TFI that is unused on all PDCH */
for (trx = trx_from; trx <= trx_to; trx++) {
bool trx_has_pdch = false;
free_tfis = 0xffffffff;
for (ts = 0; ts < 8; ts++) {
pdch = &m_bts.trx[trx].pdch[ts];
if (!pdch->is_enabled())
continue;
free_tfis &= ~pdch->assigned_tfi(dir);
trx_has_pdch = true;
has_pdch = true;
}
if (trx_has_pdch && free_tfis)
break;
free_tfis = 0;
}
if (!has_pdch) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
return -EINVAL;
}
if (!free_tfis) {
LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n");
return -EBUSY;
}
LOGP(DRLCMAC, LOGL_DEBUG,
"Searching for first unallocated TFI: TRX=%d\n", trx);
/* find the first */
for (tfi = 0; tfi < 32; tfi++) {
if (free_tfis & 1 << tfi)
break;
}
OSMO_ASSERT(tfi < 32);
LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi);
*_trx = trx;
return tfi;
}
int BTS::rcv_imm_ass_cnf(const uint8_t *data, uint32_t fn)
{
struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
uint8_t plen;
uint32_t tlli;
GprsMs *ms;
/* 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;
ms = ms_by_tlli(tlli);
if (ms)
dl_tbf = ms->dl_tbf();
if (!dl_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 (dl_tbf->m_wait_confirm)
tbf_timer_start(dl_tbf, 0, Tassign_agch);
return 0;
}
int BTS::rcv_rach(uint16_t ra, uint32_t Fn, int16_t qta, uint8_t is_11bit,
enum ph_burst_type burst_type)
{
struct gprs_rlcmac_ul_tbf *tbf = NULL;
uint8_t trx_no, ts_no = 0;
uint8_t sb = 0;
uint32_t sb_fn = 0;
int rc = 0;
int plen;
uint8_t usf = 7;
uint8_t tsc = 0, ta = qta2ta(qta);
uint16_t ms_class = 0;
uint16_t priority = 0;
bool failure = false;
rach_frame();
if (is_11bit)
rach_frame_11bit();
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, "
"so we provide one \n"
"ra=0x%02x Fn=%u qta=%d is_11bit=%d:\n", ra, Fn, qta, is_11bit);
sb = is_single_block(ra, burst_type, is_11bit, &ms_class, &priority);
if (sb) {
rc = sba()->alloc(&trx_no, &ts_no, &sb_fn, ta);
if (rc < 0) {
failure = true;
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource for "
"single block allocation."
"sending Immediate "
"Assignment Uplink (AGCH) reject\n");
} else {
tsc = m_bts.trx[trx_no].pdch[ts_no].tsc;
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH "
" qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d),"
" SBFn=%d\n",
qta, ra,
Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26,
sb_fn);
LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment "
"Uplink (AGCH)\n");
}
} else {
// Create new TBF
#warning "Copy and paste with other routines.."
if (is_11bit) {
tbf = tbf_alloc_ul_tbf(&m_bts, NULL, -1, 0,
ms_class, 1);
} else {
/* set class to 0, since we don't know the multislot
* class yet */
tbf = tbf_alloc_ul_tbf(&m_bts, NULL, -1, 0, 0, 1);
}
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource sending "
"Immediate Assignment Uplink (AGCH) "
"reject\n");
rc = -EBUSY;
failure = true;
} else {
tbf->set_ta(ta);
tbf->set_state(GPRS_RLCMAC_FLOW);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
tbf_timer_start(tbf, 3169, m_bts.t3169, 0);
LOGP(DRLCMAC, LOGL_DEBUG, "%s [UPLINK] START\n",
tbf_name(tbf));
LOGP(DRLCMAC, LOGL_DEBUG, "%s RX: [PCU <- BTS] RACH "
"qbit-ta=%d ra=0x%02x, Fn=%d "
" (%d,%d,%d)\n",
tbf_name(tbf),
qta, ra, Fn, (Fn / (26 * 51)) % 32,
Fn % 51, Fn % 26);
LOGP(DRLCMAC, LOGL_INFO, "%s TX: START Immediate "
"Assignment Uplink (AGCH)\n",
tbf_name(tbf));
trx_no = tbf->trx->trx_no;
ts_no = tbf->first_ts;
usf = tbf->m_usf[ts_no];
tsc = tbf->tsc();
}
}
bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */;
bitvec_unhex(immediate_assignment,
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
if (failure) {
plen = Encoding::write_immediate_assignment_reject(
immediate_assignment, ra, Fn,
burst_type);
immediate_assignment_reject();
}
else {
LOGP(DRLCMAC, LOGL_DEBUG,
" - TRX=%d (%d) TS=%d TA=%d TSC=%d TFI=%d USF=%d\n",
trx_no, m_bts.trx[trx_no].arfcn, ts_no, ta, tsc,
tbf ? tbf->tfi() : -1, usf);
plen = Encoding::write_immediate_assignment(
tbf, immediate_assignment, 0, ra, Fn, ta,
m_bts.trx[trx_no].arfcn, ts_no, tsc, usf, 0, sb_fn,
m_bts.alpha, m_bts.gamma, -1, burst_type, sb);
}
if (plen >= 0) {
immediate_assignment_ul_tbf();
pcu_l1if_tx_agch(immediate_assignment, plen);
}
bitvec_free(immediate_assignment);
return rc;
}
uint8_t BTS::is_single_block(uint16_t ra, enum ph_burst_type burst_type,
uint8_t is_11bit, uint16_t *ms_class, uint16_t *priority)
{
uint8_t sb = 0, val = 0;
if (!is_11bit && (burst_type == GSM_L1_BURST_TYPE_ACCESS_0)) {
if ((ra & 0xf8) == 0x70) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block "
"allocation\n");
sb = 1;
} else if (m_bts.force_two_phase) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single "
"phase access, but we force two phase "
"access\n");
sb = 1;
}
} else if (is_11bit &&
((burst_type == GSM_L1_BURST_TYPE_ACCESS_1) ||
(burst_type == GSM_L1_BURST_TYPE_ACCESS_2))) {
val = !!(ra & (1 << 10));
if (!val) {
if (m_bts.force_two_phase) {
LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS 11 bit RACH "
"received. MS requests single phase "
"access but we force two phase "
"access\n");
sb = 1;
} else {
sb = 0;
*ms_class = (ra & 0x3e0) >> 5;
*priority = (ra & 0x18) >> 3;
}
} else {
LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS 11 bit RACH received."
"MS requests single block allocation\n");
sb = 1;
}
} else if (is_11bit &&
(burst_type == GSM_L1_BURST_TYPE_ACCESS_0)) {
LOGP(DRLCMAC, LOGL_ERROR,
"Error: GPRS 11 bit RACH not supported\n");
} else if (burst_type == GSM_L1_BURST_TYPE_NONE) {
LOGP(DRLCMAC, LOGL_DEBUG, "pcu has not received burst type "
"from bts \n");
if ((ra & 0xf8) == 0x70) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block "
"allocation\n");
sb = 1;
} else if (m_bts.force_two_phase) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single "
"phase access, but we force two phase "
"access\n");
sb = 1;
}
}
return sb;
}
/* depending on the current TBF, we assign on PACCH or AGCH */
void BTS::trigger_dl_ass(
struct gprs_rlcmac_dl_tbf *dl_tbf,
struct gprs_rlcmac_tbf *old_tbf)
{
/* stop pending timer */
dl_tbf->stop_timer();
/* check for downlink tbf: */
if (old_tbf) {
LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on "
"PACCH, because %s exists\n", tbf_name(old_tbf));
old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;
old_tbf->was_releasing = old_tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE);
/* change state */
dl_tbf->set_state(GPRS_RLCMAC_ASSIGN);
if (!(dl_tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)))
dl_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
/* start timer */
tbf_timer_start(dl_tbf, 0, Tassign_pacch);
} else {
LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for %s on PCH, no TBF exist (IMSI=%s)\n", tbf_name(dl_tbf), dl_tbf->imsi());
dl_tbf->was_releasing = dl_tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE);
/* change state */
dl_tbf->set_state(GPRS_RLCMAC_ASSIGN);
dl_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
/* send immediate assignment */
dl_tbf->bts->snd_dl_ass(dl_tbf, 0, dl_tbf->imsi());
dl_tbf->m_wait_confirm = 1;
}
}
void BTS::snd_dl_ass(gprs_rlcmac_tbf *tbf, uint8_t poll, const char *imsi)
{
int plen;
unsigned int ts = tbf->first_ts;
LOGP(DRLCMAC, LOGL_INFO, "TX: START %s Immediate Assignment Downlink (PCH)\n", tbf_name(tbf));
bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */
bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
/* use request reference that has maximum distance to current time,
* so the assignment will not conflict with possible RACH requests. */
LOGP(DRLCMAC, LOGL_DEBUG, " - TRX=%d (%d) TS=%d TA=%d pollFN=%d\n",
tbf->trx->trx_no, tbf->trx->arfcn,
ts, tbf->ta(), poll ? tbf->poll_fn : -1);
plen = Encoding::write_immediate_assignment(tbf, immediate_assignment, 1, 125,
(tbf->pdch[ts]->last_rts_fn + 21216) % 2715648, tbf->ta(),
tbf->trx->arfcn, ts, tbf->tsc(), 7, poll,
tbf->poll_fn, m_bts.alpha, m_bts.gamma, -1);
if (plen >= 0) {
immediate_assignment_dl_tbf();
pcu_l1if_tx_pch(immediate_assignment, plen, imsi);
}
bitvec_free(immediate_assignment);
}
GprsMs *BTS::ms_alloc(uint8_t ms_class, uint8_t egprs_ms_class)
{
GprsMs *ms;
ms = ms_store().create_ms();
ms->set_timeout(m_bts.ms_idle_sec);
ms->set_ms_class(ms_class);
ms->set_egprs_ms_class(egprs_ms_class);
return ms;
}
/*
* PDCH code below. TODO: move to a separate file
*/
void gprs_rlcmac_pdch::enable()
{
/* TODO: Check if there are still allocated resources.. */
INIT_LLIST_HEAD(&paging_list);
m_is_enabled = 1;
}
void gprs_rlcmac_pdch::disable()
{
/* TODO.. kick free_resources once we know the TRX/TS we are on */
m_is_enabled = 0;
}
void gprs_rlcmac_pdch::free_resources()
{
struct gprs_rlcmac_paging *pag;
/* we are not enabled. there should be no resources */
if (!is_enabled())
return;
/* kick all TBF on slot */
gprs_rlcmac_tbf::free_all(this);
/* flush all pending paging messages */
while ((pag = dequeue_paging()))
talloc_free(pag);
trx->bts->sba()->free_resources(this);
}
struct gprs_rlcmac_paging *gprs_rlcmac_pdch::dequeue_paging()
{
struct gprs_rlcmac_paging *pag;
if (llist_empty(&paging_list))
return NULL;
pag = llist_entry(paging_list.next, struct gprs_rlcmac_paging, list);
llist_del(&pag->list);
return pag;
}
struct msgb *gprs_rlcmac_pdch::packet_paging_request()
{
struct gprs_rlcmac_paging *pag;
struct msgb *msg;
unsigned wp = 0, len;
/* no paging, no message */
pag = dequeue_paging();
if (!pag)
return NULL;
LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n");
/* alloc message */
msg = msgb_alloc(23, "pag ctrl block");
if (!msg) {
talloc_free(pag);
return NULL;
}
bitvec *pag_vec = bitvec_alloc(23);
if (!pag_vec) {
msgb_free(msg);
talloc_free(pag);
return NULL;
}
wp = Encoding::write_packet_paging_request(pag_vec);
/* loop until message is full */
while (pag) {
/* try to add paging */
if ((pag->identity_lv[1] & 0x07) == 4) {
/* TMSI */
LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n",
ntohl(*((uint32_t *)(pag->identity_lv + 1))));
len = 1 + 1 + 1 + 32 + 2 + 1;
if (pag->identity_lv[0] != 5) {
LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with "
"MI != 5 octets!\n");
goto continue_next;
}
} else {
/* MI */
LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n",
osmo_hexdump(pag->identity_lv + 1,
pag->identity_lv[0]));
len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1;
if (pag->identity_lv[0] > 8) {
LOGP(DRLCMAC, LOGL_ERROR, "Paging with "
"MI > 8 octets!\n");
goto continue_next;
}
}
if (wp + len > 184) {
LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule "
"next time\n");
/* put back paging record, because does not fit */
llist_add_tail(&pag->list, &paging_list);
break;
}
Encoding::write_repeated_page_info(pag_vec, wp, pag->identity_lv[0],
pag->identity_lv + 1, pag->chan_needed);
continue_next:
talloc_free(pag);
pag = dequeue_paging();
}
bitvec_pack(pag_vec, msgb_put(msg, 23));
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_downlink(pag_vec, mac_control_block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n");
bitvec_free(pag_vec);
talloc_free(mac_control_block);
return msg;
}
void gprs_rlcmac_pdch::add_paging(struct gprs_rlcmac_paging *pag)
{
llist_add(&pag->list, &paging_list);
}
void gprs_rlcmac_pdch::rcv_control_ack(Packet_Control_Acknowledgement_t *packet, uint32_t fn)
{
struct gprs_rlcmac_tbf *tbf, *new_tbf;
uint32_t tlli = packet->TLLI;
GprsMs *ms = bts()->ms_by_tlli(tlli);
tbf = bts()->ul_tbf_by_poll_fn(fn, trx_no(), ts_no);
if (!tbf)
tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
"unknown FN=%u TLLI=0x%08x (TRX %d TS %d)\n",
fn, tlli, trx_no(), ts_no);
if (ms)
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
"unknown TBF corresponds to MS with IMSI %s, TA %d, "
"uTBF (TFI=%d, state=%s), uTBF (TFI=%d, state=%s)\n",
ms->imsi(), ms->ta(),
ms->ul_tbf() ? ms->ul_tbf()->tfi() : 0,
ms->ul_tbf() ? ms->ul_tbf()->state_name() : "None",
ms->dl_tbf() ? ms->dl_tbf()->tfi() : 0,
ms->dl_tbf() ? ms->dl_tbf()->state_name() : "None");
return;
}
tbf->update_ms(tlli, GPRS_RLCMAC_UL_TBF);
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] %s Packet Control Ack\n", tbf_name(tbf));
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
/* check if this control ack belongs to packet uplink ack */
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END %s\n", tbf_name(tbf));
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
if ((tbf->state_flags &
(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
tbf->state_flags &=
~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
"ack for UL %s\n", tbf_name(tbf));
}
tbf_free(tbf);
return;
}
if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED %s\n", tbf_name(tbf));
/* reset N3105 */
tbf->n3105 = 0;
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
new_tbf = tbf->ms() ? tbf->ms()->dl_tbf() : NULL;
if (!new_tbf) {
LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL "
"TBF is gone TLLI=0x%08x\n", tlli);
return;
}
if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) &&
tbf->direction == new_tbf->direction)
tbf_free(tbf);
if ((new_tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) {
/* We now know that the PACCH really existed */
LOGP(DRLCMAC, LOGL_INFO,
"The TBF has been confirmed on the PACCH, "
"changed type from CCCH to PACCH for %s\n",
tbf_name(new_tbf));
new_tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
new_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
}
new_tbf->set_state(GPRS_RLCMAC_FLOW);
/* stop pending assignment timer */
new_tbf->stop_timer();
if ((new_tbf->state_flags &
(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
new_tbf->state_flags &=
~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink "
"assignment for %s\n", tbf_name(new_tbf));
}
tbf_assign_control_ts(new_tbf);
return;
}
if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED %s\n", tbf_name(tbf));
/* reset N3105 */
tbf->n3105 = 0;
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
new_tbf = tbf->ms() ? tbf->ms()->ul_tbf() : NULL;
if (!new_tbf) {
LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL "
"TBF is gone TLLI=0x%08x\n", tlli);
return;
}
if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) &&
tbf->direction == new_tbf->direction)
tbf_free(tbf);
new_tbf->set_state(GPRS_RLCMAC_FLOW);
if ((new_tbf->state_flags &
(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
new_tbf->state_flags &=
~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
"assignment for UL %s\n", tbf_name(new_tbf));
}
tbf_assign_control_ts(new_tbf);
/* there might be LLC packets waiting in the queue, but the DL
* TBF might have been released while the UL TBF has been
* established */
if (new_tbf->ms()->need_dl_tbf())
new_tbf->establish_dl_tbf_on_pacch();
return;
}
LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK "
"at no request\n");
}
static void get_rx_qual_meas(struct pcu_l1_meas *meas, uint8_t rx_qual_enc)
{
static const int16_t rx_qual_map[] = {
0, /* 0,14 % */
0, /* 0,28 % */
1, /* 0,57 % */
1, /* 1,13 % */
2, /* 2,26 % */
5, /* 4,53 % */
9, /* 9,05 % */
18, /* 18,10 % */
};
meas->set_ms_rx_qual(rx_qual_map[
OSMO_MIN(rx_qual_enc, ARRAY_SIZE(rx_qual_map)-1)
]);
}
static void get_meas(struct pcu_l1_meas *meas,
const Packet_Resource_Request_t *qr)
{
unsigned i;
meas->set_ms_c_value(qr->C_VALUE);
if (qr->Exist_SIGN_VAR)
meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */
for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
{
if (qr->Slot[i].Exist) {
LOGP(DRLCMAC, LOGL_INFO,
"Packet resource request: i_level[%d] = %d\n",
i, qr->Slot[i].I_LEVEL);
meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL);
}
}
}
static void get_meas(struct pcu_l1_meas *meas,
const Channel_Quality_Report_t *qr)
{
unsigned i;
get_rx_qual_meas(meas, qr->RXQUAL);
meas->set_ms_c_value(qr->C_VALUE);
meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */
for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
{
if (qr->Slot[i].Exist) {
LOGP(DRLCMAC, LOGL_INFO,
"Channel quality report: i_level[%d] = %d\n",
i, qr->Slot[i].I_LEVEL_TN);
meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL_TN);
}
}
}
void gprs_rlcmac_pdch::rcv_control_dl_ack_nack(Packet_Downlink_Ack_Nack_t *ack_nack, uint32_t fn)
{
int8_t tfi = 0; /* must be signed */
struct gprs_rlcmac_dl_tbf *tbf;
int rc;
struct pcu_l1_meas meas;
int num_blocks;
uint8_t bits_data[RLC_GPRS_WS/8];
bitvec bits;
int bsn_begin, bsn_end;
char show_bits[RLC_GPRS_WS + 1];
tfi = ack_nack->DOWNLINK_TFI;
tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
fn, tfi, trx_no(), ts_no);
return;
}
if (tbf->tfi() != tfi) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
"wrong TFI=%d, ignoring!\n", tfi);
return;
}
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack "
"for %s\n", tbf_name(tbf));
}
/* reset N3105 */
tbf->n3105 = 0;
tbf->stop_t3191();
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] %s Packet Downlink Ack/Nack\n", tbf_name(tbf));
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
bits.data = bits_data;
bits.data_len = sizeof(bits_data);
bits.cur_bit = 0;
num_blocks = Decoding::decode_gprs_acknack_bits(
&ack_nack->Ack_Nack_Description, &bits,
&bsn_begin, &bsn_end, &tbf->m_window);
LOGP(DRLCMAC, LOGL_DEBUG,
"Got GPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), "
"\"%s\"\n",
ack_nack->Ack_Nack_Description.STARTING_SEQUENCE_NUMBER,
bsn_begin, bsn_end, num_blocks,
(Decoding::extract_rbb(&bits, show_bits), show_bits));
rc = tbf->rcvd_dl_ack(
ack_nack->Ack_Nack_Description.FINAL_ACK_INDICATION,
bsn_begin, &bits);
if (rc == 1) {
tbf_free(tbf);
return;
}
/* check for channel request */
if (ack_nack->Exist_Channel_Request_Description) {
bts()->channel_request_description();
/* This call will register the new TBF with the MS on success */
gprs_rlcmac_ul_tbf *ul_tbf = tbf_alloc_ul(bts_data(),
tbf->trx->trx_no,
tbf->ms_class(), tbf->ms()->egprs_ms_class(),
tbf->tlli(), tbf->ta(), tbf->ms());
/* schedule uplink assignment or reject*/
if (ul_tbf) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
"message, so we provide one:\n");
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
} else {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
"message, so we pacekt access reject:\n");
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ;
}
}
/* get measurements */
if (tbf->ms()) {
get_meas(&meas, &ack_nack->Channel_Quality_Report);
tbf->ms()->update_l1_meas(&meas);
}
}
void gprs_rlcmac_pdch::rcv_control_egprs_dl_ack_nack(EGPRS_PD_AckNack_t *ack_nack, uint32_t fn)
{
int8_t tfi = 0; /* must be signed */
struct gprs_rlcmac_dl_tbf *tbf;
struct pcu_l1_meas meas;
int rc;
int num_blocks;
uint8_t bits_data[RLC_EGPRS_MAX_WS/8];
char show_bits[RLC_EGPRS_MAX_WS + 1];
bitvec bits;
int bsn_begin, bsn_end;
tfi = ack_nack->DOWNLINK_TFI;
tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with "
"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
fn, tfi, trx_no(), ts_no);
return;
}
if (tbf->tfi() != tfi) {
LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with "
"wrong TFI=%d, ignoring!\n", tfi);
return;
}
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered EGPRS downlink ack "
"for %s\n", tbf_name(tbf));
}
/* reset N3105 */
tbf->n3105 = 0;
tbf->stop_t3191();
LOGP(DRLCMAC, LOGL_DEBUG,
"RX: [PCU <- BTS] %s EGPRS Packet Downlink Ack/Nack\n",
tbf_name(tbf));
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS ACK/NACK: "
"ut: %d, final: %d, bow: %d, eow: %d, ssn: %d, have_crbb: %d, "
"urbb_len:%d, %p, %p, %d, %d, win: %d-%d, urbb: %s\n",
(int)ack_nack->EGPRS_AckNack.UnionType,
(int)ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
(int)ack_nack->EGPRS_AckNack.Desc.BEGINNING_OF_WINDOW,
(int)ack_nack->EGPRS_AckNack.Desc.END_OF_WINDOW,
(int)ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER,
(int)ack_nack->EGPRS_AckNack.Desc.Exist_CRBB,
(int)ack_nack->EGPRS_AckNack.Desc.URBB_LENGTH,
(void *)&ack_nack->EGPRS_AckNack.UnionType,
(void *)&ack_nack->EGPRS_AckNack.Desc,
(int)offsetof(EGPRS_AckNack_t, Desc),
(int)offsetof(EGPRS_AckNack_w_len_t, Desc),
tbf->m_window.v_a(),
tbf->m_window.v_s(),
osmo_hexdump((const uint8_t *)&ack_nack->EGPRS_AckNack.Desc.URBB,
sizeof(ack_nack->EGPRS_AckNack.Desc.URBB)));
bits.data = bits_data;
bits.data_len = sizeof(bits_data);
bits.cur_bit = 0;
num_blocks = Decoding::decode_egprs_acknack_bits(
&ack_nack->EGPRS_AckNack.Desc, &bits,
&bsn_begin, &bsn_end, &tbf->m_window);
LOGP(DRLCMAC, LOGL_DEBUG,
"Got EGPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), "
"\"%s\"\n",
ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER,
bsn_begin, bsn_end, num_blocks,
(Decoding::extract_rbb(&bits, show_bits), show_bits)
);
rc = tbf->rcvd_dl_ack(
ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
bsn_begin, &bits);
if (rc == 1) {
tbf_free(tbf);
return;
}
/* check for channel request */
if (ack_nack->Exist_ChannelRequestDescription) {
bts()->channel_request_description();
/* This call will register the new TBF with the MS on success */
gprs_rlcmac_ul_tbf *ul_tbf = tbf_alloc_ul(bts_data(),
tbf->trx->trx_no,
tbf->ms_class(), tbf->ms()->egprs_ms_class(),
tbf->tlli(), tbf->ta(), tbf->ms());
/* schedule uplink assignment or reject*/
if (ul_tbf) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
"message, so we provide one:\n");
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
} else {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
"message, so we send packet access reject:\n");
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ;
}
}
/* get measurements */
if (tbf->ms()) {
/* TODO: Implement Measurements parsing for EGPRS */
/*
get_meas(&meas, &ack_nack->Channel_Quality_Report);
tbf->ms()->update_l1_meas(&meas);
*/
}
}
void gprs_rlcmac_pdch::rcv_resource_request(Packet_Resource_Request_t *request, uint32_t fn)
{
struct gprs_rlcmac_sba *sba;
if (request->ID.UnionType) {
struct gprs_rlcmac_ul_tbf *ul_tbf = NULL;
struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
uint32_t tlli = request->ID.u.TLLI;
uint8_t ms_class = 0;
uint8_t egprs_ms_class = 0;
uint8_t ta = GSM48_TA_INVALID;
struct pcu_l1_meas meas;
GprsMs *ms = bts()->ms_by_tlli(tlli);
/* Keep the ms, even if it gets idle temporarily */
GprsMs::Guard guard(ms);
if (ms) {
ul_tbf = ms->ul_tbf();
dl_tbf = ms->dl_tbf();
ta = ms->ta();
}
/* We got a RACH so the MS was in packet idle mode and thus
* didn't have any active TBFs */
if (ul_tbf) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
"TLLI=0x%08x while %s still "
"exists. Killing pending UL TBF\n",
tlli, tbf_name(ul_tbf));
tbf_free(ul_tbf);
ul_tbf = NULL;
}
if (dl_tbf) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
"TLLI=0x%08x while %s still exists. "
"Release pending DL TBF\n", tlli,
tbf_name(dl_tbf));
tbf_free(dl_tbf);
dl_tbf = NULL;
}
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF "
"in packet resource request of single "
"block, so we provide one:\n");
sba = bts()->sba()->find(this, fn);
if (!sba) {
LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF "
"in packet resource request of single "
"block, but there is no resource request "
"scheduled!\n");
} else {
ta = sba->ta;
bts()->sba()->free_sba(sba);
}
if (request->Exist_MS_Radio_Access_capability) {
ms_class = Decoding::get_ms_class_by_capability(
&request->MS_Radio_Access_capability);
egprs_ms_class =
Decoding::get_egprs_ms_class_by_capability(
&request->MS_Radio_Access_capability);
}
if (!ms_class)
LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n");
if (egprs_ms_class)
LOGP(DRLCMAC, LOGL_NOTICE,
"MS supports EGPRS multislot class %d.\n",
egprs_ms_class);
ul_tbf = tbf_alloc_ul(bts_data(), trx_no(), ms_class,
egprs_ms_class, tlli, ta, ms);
if (!ul_tbf) {
handle_tbf_reject(bts_data(), ms, tlli,
trx_no(), ts_no);
return;
}
/* set control ts to current MS's TS, until assignment complete */
LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts_no);
ul_tbf->control_ts = ts_no;
/* schedule uplink assignment */
ul_tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
/* get capabilities */
if (ul_tbf->ms())
ul_tbf->ms()->set_egprs_ms_class(egprs_ms_class);
/* get measurements */
if (ul_tbf->ms()) {
get_meas(&meas, request);
ul_tbf->ms()->update_l1_meas(&meas);
}
return;
}
if (request->ID.u.Global_TFI.UnionType) {
struct gprs_rlcmac_dl_tbf *dl_tbf;
int8_t tfi = request->ID.u.Global_TFI.u.DOWNLINK_TFI;
dl_tbf = bts()->dl_tbf_by_tfi(tfi, trx_no(), ts_no);
if (!dl_tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TFI=%d\n", tfi);
return;
}
LOGP(DRLCMAC, LOGL_ERROR,
"RX: [PCU <- BTS] %s FIXME: Packet resource request\n",
tbf_name(dl_tbf));
} else {
struct gprs_rlcmac_ul_tbf *ul_tbf;
int8_t tfi = request->ID.u.Global_TFI.u.UPLINK_TFI;
ul_tbf = bts()->ul_tbf_by_tfi(tfi, trx_no(), ts_no);
if (!ul_tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TFI=%d\n", tfi);
return;
}
LOGP(DRLCMAC, LOGL_ERROR,
"RX: [PCU <- BTS] %s FIXME: Packet resource request\n",
tbf_name(ul_tbf));
}
}
void gprs_rlcmac_pdch::rcv_measurement_report(Packet_Measurement_Report_t *report, uint32_t fn)
{
struct gprs_rlcmac_sba *sba;
sba = bts()->sba()->find(this, fn);
if (!sba) {
LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement "
"in packet resource request of single "
"block, but there is no resource request "
"scheduled! TLLI=0x%08x\n", report->TLLI);
} else {
GprsMs *ms = bts()->ms_store().get_ms(report->TLLI);
if (!ms)
LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement "
"but TLLI 0x%08x is unknown\n", report->TLLI);
else
ms->set_ta(sba->ta);
bts()->sba()->free_sba(sba);
}
gprs_rlcmac_meas_rep(report);
}
/* Received Uplink RLC control block. */
int gprs_rlcmac_pdch::rcv_control_block(
bitvec *rlc_block, uint32_t fn)
{
RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n");
bts()->rlc_rcvd_control();
switch (ul_control_block->u.MESSAGE_TYPE) {
case MT_PACKET_CONTROL_ACK:
rcv_control_ack(&ul_control_block->u.Packet_Control_Acknowledgement, fn);
break;
case MT_PACKET_DOWNLINK_ACK_NACK:
rcv_control_dl_ack_nack(&ul_control_block->u.Packet_Downlink_Ack_Nack, fn);
break;
case MT_EGPRS_PACKET_DOWNLINK_ACK_NACK:
rcv_control_egprs_dl_ack_nack(&ul_control_block->u.Egprs_Packet_Downlink_Ack_Nack, fn);
break;
case MT_PACKET_RESOURCE_REQUEST:
rcv_resource_request(&ul_control_block->u.Packet_Resource_Request, fn);
break;
case MT_PACKET_MEASUREMENT_REPORT:
rcv_measurement_report(&ul_control_block->u.Packet_Measurement_Report, fn);
break;
case MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK:
/* ignoring it. change the SI to not force sending these? */
break;
default:
bts()->decode_error();
LOGP(DRLCMAC, LOGL_NOTICE,
"RX: [PCU <- BTS] unknown control block(%d) received\n",
ul_control_block->u.MESSAGE_TYPE);
}
talloc_free(ul_control_block);
return 1;
}
/* received RLC/MAC block from L1 */
int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn,
struct pcu_l1_meas *meas)
{
GprsCodingScheme cs = GprsCodingScheme::getBySizeUL(len);
if (!cs) {
bts()->decode_error();
LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
"length: %d)\n", len);
return -EINVAL;
}
bts()->rlc_ul_bytes(len);
LOGP(DRLCMACUL, LOGL_DEBUG, "Got RLC block, coding scheme: %s, "
"length: %d (%d))\n", cs.name(), len, cs.usedSizeUL());
if (cs.isGprs())
return rcv_block_gprs(data, fn, meas, cs);
if (cs.isEgprs())
return rcv_data_block(data, fn, meas, cs);
bts()->decode_error();
LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n",
cs.name());
return -EINVAL;
}
/*! \brief process egprs and gprs data blocks */
int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint32_t fn,
struct pcu_l1_meas *meas, GprsCodingScheme cs)
{
int rc;
struct gprs_rlc_data_info rlc_dec;
struct gprs_rlcmac_ul_tbf *tbf;
unsigned len = cs.sizeUL();
/* These are always data blocks, since EGPRS still uses CS-1 for
* control blocks (see 44.060, section 10.3, 1st par.)
*/
if (cs.isEgprs()) {
if (!bts()->bts_data()->egprs_enabled) {
LOGP(DRLCMACUL, LOGL_ERROR,
"Got %s RLC block but EGPRS is not enabled\n",
cs.name());
return -EINVAL;
}
}
LOGP(DRLCMACUL, LOGL_DEBUG, " UL data: %s\n", osmo_hexdump(data, len));
rc = Decoding::rlc_parse_ul_data_header(&rlc_dec, data, cs);
if (rc < 0) {
LOGP(DRLCMACUL, LOGL_ERROR,
"Got %s RLC block but header parsing has failed\n",
cs.name());
bts()->decode_error();
return rc;
}
LOGP(DRLCMACUL, LOGL_INFO,
"Got %s RLC block: "
"R=%d, SI=%d, TFI=%d, CPS=%d, RSB=%d, "
"rc=%d\n",
cs.name(),
rlc_dec.r, rlc_dec.si, rlc_dec.tfi, rlc_dec.cps, rlc_dec.rsb,
rc);
/* find TBF inst from given TFI */
tbf = ul_tbf_by_tfi(rlc_dec.tfi);
if (!tbf) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n",
rlc_dec.tfi);
return 0;
}
return tbf->rcv_data_block_acknowledged(&rlc_dec, data, meas);
}
int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint32_t fn,
struct pcu_l1_meas *meas, GprsCodingScheme cs)
{
unsigned payload = data[0] >> 6;
bitvec *block;
int rc = 0;
unsigned len = cs.maxBytesUL();
switch (payload) {
case GPRS_RLCMAC_DATA_BLOCK:
rc = rcv_data_block(data, fn, meas, cs);
break;
case GPRS_RLCMAC_CONTROL_BLOCK:
block = bitvec_alloc(len);
if (!block)
return -ENOMEM;
bitvec_unpack(block, data);
rc = rcv_control_block(block, fn);
bitvec_free(block);
break;
case GPRS_RLCMAC_CONTROL_BLOCK_OPT:
LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n");
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload);
rc = -EINVAL;
}
return rc;
}
void bts_update_tbf_ta(const char *p, uint32_t fn, uint8_t trx_no, uint8_t ts,
uint8_t ta)
{
struct gprs_rlcmac_ul_tbf *tbf =
bts_main_data()->bts->ul_tbf_by_poll_fn(fn, trx_no, ts);
if (!tbf)
LOGP(DL1IF, LOGL_DEBUG, "[%s] update TA = %u ignored due to "
"unknown UL TBF on TRX = %d, TS = %d, FN = %d\n",
p, ta, trx_no, ts, fn);
else if (tbf->ta() != ta) {
LOGP(DL1IF, LOGL_INFO, "[%s] Updating TA %u -> %u on "
"TRX = %d, TS = %d, FN = %d\n",
p, tbf->ta(), ta, trx_no, ts, fn);
tbf->set_ta(ta);
}
}
gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_from_list_by_tfi(
LListHead<gprs_rlcmac_tbf> *tbf_list, uint8_t tfi,
enum gprs_rlcmac_tbf_direction dir)
{
gprs_rlcmac_tbf *tbf;
LListHead<gprs_rlcmac_tbf> *pos;
llist_for_each(pos, tbf_list) {
tbf = pos->entry();
if (tbf->tfi() != tfi)
continue;
if (!tbf->pdch[ts_no])
continue;
return tbf;
}
return NULL;
}
gprs_rlcmac_ul_tbf *gprs_rlcmac_pdch::ul_tbf_by_tfi(uint8_t tfi)
{
return as_ul_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF));
}
gprs_rlcmac_dl_tbf *gprs_rlcmac_pdch::dl_tbf_by_tfi(uint8_t tfi)
{
return as_dl_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF));
}
/* lookup TBF Entity (by TFI) */
gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_by_tfi(uint8_t tfi,
enum gprs_rlcmac_tbf_direction dir)
{
struct gprs_rlcmac_tbf *tbf;
if (tfi >= 32)
return NULL;
tbf = m_tbfs[dir][tfi];
if (!tbf)
return NULL;
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)) {
return tbf;
}
return NULL;
}
void gprs_rlcmac_pdch::attach_tbf(gprs_rlcmac_tbf *tbf)
{
gprs_rlcmac_ul_tbf *ul_tbf;
if (m_tbfs[tbf->direction][tbf->tfi()])
LOGP(DRLCMAC, LOGL_ERROR, "PDCH(TS %d, TRX %d): "
"%s has not been detached, overwriting it\n",
ts_no, trx_no(),
m_tbfs[tbf->direction][tbf->tfi()]->name());
m_num_tbfs[tbf->direction] += 1;
if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
ul_tbf = as_ul_tbf(tbf);
m_assigned_usf |= 1 << ul_tbf->m_usf[ts_no];
}
m_assigned_tfi[tbf->direction] |= 1UL << tbf->tfi();
m_tbfs[tbf->direction][tbf->tfi()] = tbf;
LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Attaching %s, %d TBFs, "
"USFs = %02x, TFIs = %08x.\n",
ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction],
m_assigned_usf, m_assigned_tfi[tbf->direction]);
}
void gprs_rlcmac_pdch::detach_tbf(gprs_rlcmac_tbf *tbf)
{
gprs_rlcmac_ul_tbf *ul_tbf;
OSMO_ASSERT(m_num_tbfs[tbf->direction] > 0);
m_num_tbfs[tbf->direction] -= 1;
if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
ul_tbf = as_ul_tbf(tbf);
m_assigned_usf &= ~(1 << ul_tbf->m_usf[ts_no]);
}
m_assigned_tfi[tbf->direction] &= ~(1UL << tbf->tfi());
m_tbfs[tbf->direction][tbf->tfi()] = NULL;
LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Detaching %s, %d TBFs, "
"USFs = %02x, TFIs = %08x.\n",
ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction],
m_assigned_usf, m_assigned_tfi[tbf->direction]);
}
void gprs_rlcmac_pdch::reserve(enum gprs_rlcmac_tbf_direction dir)
{
m_num_reserved[dir] += 1;
}
void gprs_rlcmac_pdch::unreserve(enum gprs_rlcmac_tbf_direction dir)
{
OSMO_ASSERT(m_num_reserved[dir] > 0);
m_num_reserved[dir] -= 1;
}
void gprs_rlcmac_trx::reserve_slots(enum gprs_rlcmac_tbf_direction dir,
uint8_t slots)
{
unsigned i;
for (i = 0; i < ARRAY_SIZE(pdch); i += 1)
if (slots & (1 << i))
pdch[i].reserve(dir);
}
void gprs_rlcmac_trx::unreserve_slots(enum gprs_rlcmac_tbf_direction dir,
uint8_t slots)
{
unsigned i;
for (i = 0; i < ARRAY_SIZE(pdch); i += 1)
if (slots & (1 << i))
pdch[i].unreserve(dir);
}
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