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osmo-pcu/src/pdch.cpp

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/*
* Copyright (C) 2013 by Holger Hans Peter Freyther
* Copyright (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* 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 <pdch.h>
#include <decoding.h>
#include <encoding.h>
#include <gprs_rlcmac.h>
#include <gprs_debug.h>
#include <gprs_coding_scheme.h>
#include <gprs_ms.h>
#include <gprs_ms_storage.h>
#include <pcu_l1_if.h>
#include <rlc.h>
#include <sba.h>
#include <tbf.h>
#include <tbf_ul.h>
#include <cxx_linuxlist.h>
extern "C" {
#include <osmocom/core/talloc.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/core/gsmtap.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/utils.h>
#include "coding_scheme.h"
#include "gsm_rlcmac.h"
}
#include <errno.h>
#include <stdlib.h>
#include <arpa/inet.h>
extern void *tall_pcu_ctx;
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->I_LEVEL_TN), ARRAY_SIZE(meas->ts)); i++)
{
if (qr->I_LEVEL_TN[i].Exist) {
LOGP(DRLCMAC, LOGL_INFO,
"Packet resource request: i_level[%d] = %d\n",
i, qr->I_LEVEL_TN[i].I_LEVEL);
meas->set_ms_i_level(i, -2 * qr->I_LEVEL_TN[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_DEBUG,
"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);
}
}
}
static inline void sched_ul_ass_or_rej(BTS *bts, gprs_rlcmac_bts *bts_data, struct gprs_rlcmac_dl_tbf *tbf)
{
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_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS);
} else {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack message, so we packet access reject:\n");
TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ);
}
}
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;
RlcMacDownlink_t *mac_control_block;
bitvec *pag_vec;
struct msgb *msg;
unsigned wp = 0, len;
int rc;
/* 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;
}
pag_vec = bitvec_alloc(23, tall_pcu_ctx);
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) {
LOGP(DRLCMAC, LOGL_DEBUG, "Paging MI - %s\n",
osmo_mi_name(pag->identity_lv + 1, pag->identity_lv[0]));
/* try to add paging */
if ((pag->identity_lv[1] & GSM_MI_TYPE_MASK) == GSM_MI_TYPE_TMSI) {
/* TMSI */
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 */
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));
mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n");
rc = decode_gsm_rlcmac_downlink(pag_vec, mac_control_block);
if (rc < 0) {
LOGP(DRLCMAC, LOGL_ERROR, "Decoding of Downlink Packet Paging Request failed (%d)\n", rc);
goto free_ret;
}
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n");
bitvec_free(pag_vec);
talloc_free(mac_control_block);
return msg;
free_ret:
bitvec_free(pag_vec);
talloc_free(mac_control_block);
msgb_free(msg);
return NULL;
}
bool gprs_rlcmac_pdch::add_paging(uint8_t chan_needed, const uint8_t *mi, uint8_t mi_len)
{
struct gprs_rlcmac_paging *pag = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_paging);
if (!pag)
return false;
pag->chan_needed = chan_needed;
pag->identity_lv[0] = mi_len;
memcpy(&pag->identity_lv[1], mi, mi_len);
llist_add(&pag->list, &paging_list);
return true;
}
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);
gprs_rlcmac_ul_tbf *ul_tbf;
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), dTBF (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;
}
/* Reset N3101 counter: */
tbf->n_reset(N3101);
tbf->update_ms(tlli, GPRS_RLCMAC_UL_TBF);
LOGPTBF(tbf, LOGL_DEBUG, "RX: [PCU <- BTS] Packet Control Ack\n");
TBF_POLL_SCHED_UNSET(tbf);
/* check if this control ack belongs to packet uplink ack */
ul_tbf = as_ul_tbf(tbf);
if (ul_tbf && ul_tbf->handle_ctrl_ack()) {
LOGPTBF(tbf, LOGL_DEBUG, "[UPLINK] END\n");
if (ul_tbf->ctrl_ack_to_toggle())
LOGPTBF(tbf, LOGL_NOTICE, "Recovered uplink ack for UL\n");
tbf_free(tbf);
return;
}
if (tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_WAIT_ACK)) {
LOGPTBF(tbf, LOGL_DEBUG, "[UPLINK] DOWNLINK ASSIGNED\n");
/* reset N3105 */
tbf->n_reset(N3105);
TBF_SET_ASS_STATE_DL(tbf, 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->check_n_clear(GPRS_RLCMAC_FLAG_CCCH)) {
/* We now know that the PACCH really existed */
LOGPTBF(new_tbf, LOGL_INFO,
"The TBF has been confirmed on the PACCH, "
"changed type from CCCH to PACCH\n");
TBF_ASS_TYPE_SET(new_tbf, GPRS_RLCMAC_FLAG_PACCH);
}
TBF_SET_STATE(new_tbf, GPRS_RLCMAC_FLOW);
/* stop pending assignment timer */
new_tbf->t_stop(T0, "control acked (DL-TBF)");
if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_TO_DL_ASS))
LOGPTBF(new_tbf, LOGL_NOTICE, "Recovered downlink assignment\n");
tbf_assign_control_ts(new_tbf);
return;
}
if (tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_WAIT_ACK)) {
LOGPTBF(tbf, LOGL_DEBUG, "[DOWNLINK] UPLINK ASSIGNED\n");
/* reset N3105 */
tbf->n_reset(N3105);
TBF_SET_ASS_STATE_UL(tbf, 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);
TBF_SET_STATE(new_tbf, GPRS_RLCMAC_FLOW);
if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_TO_UL_ASS))
LOGPTBF(new_tbf, LOGL_NOTICE, "Recovered uplink assignment for UL\n");
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");
}
void gprs_rlcmac_pdch::rcv_control_dl_ack_nack(Packet_Downlink_Ack_Nack_t *ack_nack, uint32_t fn, struct pcu_l1_meas *meas)
{
int8_t tfi = 0; /* must be signed */
struct gprs_rlcmac_dl_tbf *tbf;
int rc;
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;
}
/* Reset N3101 counter: */
tbf->n_reset(N3101);
if (tbf->handle_ack_nack())
LOGPTBF(tbf, LOGL_NOTICE, "Recovered downlink ack\n");
LOGPTBF(tbf, LOGL_DEBUG, "RX: [PCU <- BTS] Packet Downlink Ack/Nack\n");
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->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)
sched_ul_ass_or_rej(bts(), bts_data(), tbf);
/* 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, struct pcu_l1_meas *meas)
{
int8_t tfi = 0; /* must be signed */
struct gprs_rlcmac_dl_tbf *tbf;
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;
}
/* Reset N3101 counter: */
tbf->n_reset(N3101);
if (tbf->handle_ack_nack())
LOGPTBF(tbf, LOGL_NOTICE, "Recovered EGPRS downlink ack\n");
LOGPTBF(tbf, LOGL_DEBUG,
"RX: [PCU <- BTS] EGPRS Packet Downlink Ack/Nack\n");
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->window()->v_a(),
tbf->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->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)
sched_ul_ass_or_rej(bts(), bts_data(), tbf);
/* 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 pcu_l1_meas *meas)
{
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;
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) {
LOGPTBFUL(ul_tbf, LOGL_NOTICE,
"Got RACH from TLLI=0x%08x while TBF still exists. Killing pending UL TBF\n",
tlli);
tbf_free(ul_tbf);
ul_tbf = NULL;
}
if (dl_tbf) {
LOGPTBFUL(dl_tbf, LOGL_NOTICE,
"Got RACH from TLLI=0x%08x while TBF still exists. Release pending DL TBF\n",
tlli);
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_capability2) {
ms_class = Decoding::get_ms_class_by_capability(
&request->MS_Radio_Access_capability2);
egprs_ms_class =
Decoding::get_egprs_ms_class_by_capability(
&request->MS_Radio_Access_capability2);
}
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 */
LOGPTBF(ul_tbf, LOGL_DEBUG, "change control TS %d -> %d until assignment is complete.\n",
ul_tbf->control_ts, ts_no);
ul_tbf->control_ts = ts_no;
/* schedule uplink assignment */
TBF_SET_ASS_STATE_UL(ul_tbf, 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 RESOURCE REQ unknown downlink TFI=%d\n", tfi);
return;
}
LOGPTBFDL(dl_tbf, LOGL_ERROR,
"RX: [PCU <- BTS] FIXME: Packet resource request\n");
/* Reset N3101 counter: */
dl_tbf->n_reset(N3101);
} 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 RESOURCE REQ unknown uplink TFI=%d\n", tfi);
return;
}
LOGPTBFUL(ul_tbf, LOGL_ERROR,
"RX: [PCU <- BTS] FIXME: Packet resource request\n");
/* Reset N3101 counter: */
ul_tbf->n_reset(N3101);
}
}
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(const uint8_t *data, uint8_t data_len,
uint32_t fn, struct pcu_l1_meas *meas, GprsCodingScheme cs)
{
bitvec *rlc_block;
RlcMacUplink_t *ul_control_block;
unsigned len = cs.maxBytesUL();
int rc;
if (!(rlc_block = bitvec_alloc(len, tall_pcu_ctx)))
return -ENOMEM;
bitvec_unpack(rlc_block, data);
ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
rc = decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
if (ul_control_block->u.MESSAGE_TYPE == MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK)
bts()->send_gsmtap(PCU_GSMTAP_C_UL_DUMMY, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len);
else
bts()->send_gsmtap(PCU_GSMTAP_C_UL_CTRL, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len);
if(rc < 0) {
LOGP(DRLCMACUL, LOGL_ERROR, "Dropping Uplink Control Block with invalid "
"content, decode failed: %d)\n", rc);
goto free_ret;
}
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, meas);
break;
case MT_EGPRS_PACKET_DOWNLINK_ACK_NACK:
rcv_control_egprs_dl_ack_nack(&ul_control_block->u.Egprs_Packet_Downlink_Ack_Nack, fn, meas);
break;
case MT_PACKET_RESOURCE_REQUEST:
rcv_resource_request(&ul_control_block->u.Packet_Resource_Request, fn, meas);
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);
}
free_ret:
talloc_free(ul_control_block);
bitvec_free(rlc_block);
return rc;
}
/* 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", mcs_name(cs), len, cs.usedSizeUL());
if (mcs_is_gprs(cs))
return rcv_block_gprs(data, len, fn, meas, cs);
if (mcs_is_edge(cs))
return rcv_data_block(data, len, fn, meas, cs);
bts()->decode_error();
LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n",
mcs_name(cs));
return -EINVAL;
}
/*! \brief process egprs and gprs data blocks */
int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint8_t data_len, 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 (mcs_is_edge(cs)) {
if (!bts()->bts_data()->egprs_enabled) {
LOGP(DRLCMACUL, LOGL_ERROR,
"Got %s RLC block but EGPRS is not enabled\n",
mcs_name(cs));
return -EINVAL;
}
bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_EGPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn,
data, data_len);
} else {
bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_GPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn,
data, data_len);
}
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",
mcs_name(cs));
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",
mcs_name(cs),
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;
}
/* Reset N3101 counter: */
tbf->n_reset(N3101);
return tbf->rcv_data_block_acknowledged(&rlc_dec, data, meas);
}
int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint8_t data_len, uint32_t fn,
struct pcu_l1_meas *meas, GprsCodingScheme cs)
{
unsigned payload = data[0] >> 6;
int rc = 0;
switch (payload) {
case GPRS_RLCMAC_DATA_BLOCK:
rc = rcv_data_block(data, data_len, fn, meas, cs);
break;
case GPRS_RLCMAC_CONTROL_BLOCK:
rc = rcv_control_block(data, data_len, fn, meas, cs);
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;
}
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;
}
inline BTS *gprs_rlcmac_pdch::bts() const
{
return trx->bts;
}
uint8_t gprs_rlcmac_pdch::trx_no() const
{
return trx->trx_no;
}
inline gprs_rlcmac_bts *gprs_rlcmac_pdch::bts_data() const
{
return trx->bts->bts_data();
}
/* PTCCH (Packet Timing Advance Control Channel) */
void gprs_rlcmac_pdch::init_ptcch_msg(void)
{
memset(ptcch_msg, PTCCH_TAI_FREE, PTCCH_TAI_NUM);
memset(ptcch_msg + PTCCH_TAI_NUM, PTCCH_PADDING, 7);
}
uint8_t gprs_rlcmac_pdch::reserve_tai(uint8_t ta)
{
uint8_t tai;
for (tai = 0; tai < PTCCH_TAI_NUM; tai++) {
if (ptcch_msg[tai] == PTCCH_TAI_FREE) {
ptcch_msg[tai] = ta;
return tai;
}
}
/* Special case: no free TAI available */
return PTCCH_TAI_FREE;
}
void gprs_rlcmac_pdch::release_tai(uint8_t tai)
{
OSMO_ASSERT(tai < PTCCH_TAI_NUM);
ptcch_msg[tai] = PTCCH_TAI_FREE;
}
void gprs_rlcmac_pdch::update_ta(uint8_t tai, uint8_t ta)
{
OSMO_ASSERT(tai < PTCCH_TAI_NUM);
ptcch_msg[tai] = ta;
}
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