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osmo-pcu
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osmo-pcu/src/tbf.cpp

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/* Copied from gprs_bssgp_pcu.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 <tbf.h>
#include <gprs_rlcmac.h>
#include <gprs_debug.h>
extern "C" {
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
}
#include <errno.h>
#include <string.h>
extern void *tall_pcu_ctx;
static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf,
const uint8_t ms_class)
{
if (!tbf->ms_class && ms_class)
tbf->ms_class = ms_class;
}
static inline void tbf_assign_imsi(struct gprs_rlcmac_tbf *tbf,
const char *imsi)
{
strncpy(tbf->meas.imsi, imsi, sizeof(tbf->meas.imsi) - 1);
}
static struct gprs_rlcmac_tbf *tbf_lookup_dl(const uint32_t tlli, const char *imsi)
{
/* TODO: look up by IMSI first, then tlli, then old_tlli */
return tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF);
}
static int tbf_append_data(struct gprs_rlcmac_tbf *tbf,
struct gprs_rlcmac_bts *bts,
const uint8_t ms_class,
const uint16_t pdu_delay_csec,
const uint8_t *data, const uint16_t len)
{
LOGP(DRLCMAC, LOGL_INFO, "TBF: APPEND TFI: %u TLLI: 0x%08x\n", tbf->tfi, tbf->tlli);
if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE)) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF in WAIT RELEASE state "
"(T3193), so reuse TBF\n");
memcpy(tbf->llc_frame, data, len);
tbf->llc_length = len;
/* reset rlc states */
memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl));
/* keep to flags */
tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK;
tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
tbf_update_ms_class(tbf, ms_class);
tbf_update(bts, tbf);
gprs_rlcmac_trigger_downlink_assignment(bts, tbf, tbf, NULL);
} else {
/* the TBF exists, so we must write it in the queue
* we prepend lifetime in front of PDU */
struct timeval *tv;
struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv),
"llc_pdu_queue");
if (!llc_msg)
return -ENOMEM;
tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv));
uint16_t delay_csec;
if (bts->force_llc_lifetime)
delay_csec = bts->force_llc_lifetime;
else
delay_csec = pdu_delay_csec;
/* keep timestap at 0 for infinite delay */
if (delay_csec != 0xffff) {
/* calculate timestamp of timeout */
gettimeofday(tv, NULL);
tv->tv_usec += (delay_csec % 100) * 10000;
tv->tv_sec += delay_csec / 100;
if (tv->tv_usec > 999999) {
tv->tv_usec -= 1000000;
tv->tv_sec++;
}
}
memcpy(msgb_put(llc_msg, len), data, len);
msgb_enqueue(&tbf->llc_queue, llc_msg);
tbf_update_ms_class(tbf, ms_class);
}
return 0;
}
static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts,
const char *imsi,
const uint32_t tlli, const uint8_t ms_class,
const uint8_t *data, const uint16_t len)
{
uint8_t trx, ta, ss;
int8_t use_trx;
struct gprs_rlcmac_tbf *old_tbf, *tbf;
int8_t tfi; /* must be signed */
int rc;
/* check for uplink data, so we copy our informations */
#warning "Do the same look up for IMSI, TLLI and OLD_TLLI"
#warning "Refactor the below lines... into a new method"
tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
if (tbf && tbf->dir.ul.contention_resolution_done
&& !tbf->dir.ul.final_ack_sent) {
use_trx = tbf->trx_no;
ta = tbf->ta;
ss = 0;
old_tbf = tbf;
} else {
use_trx = -1;
/* we already have an uplink TBF, so we use that TA */
if (tbf)
ta = tbf->ta;
else {
/* recall TA */
rc = bts->bts->timing_advance()->recall(tlli);
if (rc < 0) {
LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown"
", assuming 0\n");
ta = 0;
} else
ta = rc;
}
ss = 1; /* PCH assignment only allows one timeslot */
old_tbf = NULL;
}
// Create new TBF (any TRX)
#warning "Copy and paste with alloc_ul_tbf"
tfi = tfi_find_free(bts, GPRS_RLCMAC_DL_TBF, &trx, use_trx);
if (tfi < 0) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");
/* FIXME: send reject */
return -EBUSY;
}
/* set number of downlink slots according to multislot class */
tbf = tbf_alloc(bts, tbf, GPRS_RLCMAC_DL_TBF, tfi, trx, ms_class, ss);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return -EBUSY;
}
tbf->tlli = tlli;
tbf->tlli_valid = 1;
tbf->ta = ta;
LOGP(DRLCMAC, LOGL_DEBUG,
"TBF: [DOWNLINK] START TFI: %d TLLI: 0x%08x \n",
tbf->tfi, tbf->tlli);
/* new TBF, so put first frame */
memcpy(tbf->llc_frame, data, len);
tbf->llc_length = len;
/* trigger downlink assignment and set state to ASSIGN.
* we don't use old_downlink, so the possible uplink is used
* to trigger downlink assignment. if there is no uplink,
* AGCH is used. */
gprs_rlcmac_trigger_downlink_assignment(bts, tbf, old_tbf, imsi);
/* store IMSI for debugging purpose. TODO: it is more than debugging */
tbf_assign_imsi(tbf, imsi);
return 0;
}
/**
* TODO: split into unit test-able parts...
*/
int tbf_handle(struct gprs_rlcmac_bts *bts,
const uint32_t tlli, const char *imsi,
const uint8_t ms_class, const uint16_t delay_csec,
const uint8_t *data, const uint16_t len)
{
struct gprs_rlcmac_tbf *tbf;
/* check for existing TBF */
tbf = tbf_lookup_dl(tlli, imsi);
if (tbf) {
int rc = tbf_append_data(tbf, bts, ms_class,
delay_csec, data, len);
if (rc >= 0)
tbf_assign_imsi(tbf, imsi);
return rc;
}
return tbf_new_dl_assignment(bts, imsi, tlli, ms_class, data, len);
}
struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
int8_t use_trx, uint8_t ms_class,
uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf)
{
uint8_t trx;
struct gprs_rlcmac_tbf *tbf;
uint8_t tfi;
#warning "Copy and paste with tbf_new_dl_assignment"
/* create new TBF, use sme TRX as DL TBF */
tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, use_trx);
if (tfi < 0) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
/* use multislot class of downlink TBF */
tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
tbf->tlli = tlli;
tbf->tlli_valid = 1; /* no contention resolution */
tbf->dir.ul.contention_resolution_done = 1;
tbf->ta = ta; /* use current TA */
tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
tbf_timer_start(tbf, 3169, bts->t3169, 0);
return tbf;
}
static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf)
{
struct gprs_rlcmac_pdch *pdch;
int ts;
if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
tbf->trx->ul_tbf[tbf->tfi] = NULL;
for (ts = 0; ts < 8; ts++) {
pdch = tbf->pdch[ts];
if (pdch)
pdch->ul_tbf[tbf->tfi] = NULL;
tbf->pdch[ts] = NULL;
}
} else {
tbf->trx->dl_tbf[tbf->tfi] = NULL;
for (ts = 0; ts < 8; ts++) {
pdch = tbf->pdch[ts];
if (pdch)
pdch->dl_tbf[tbf->tfi] = NULL;
tbf->pdch[ts] = NULL;
}
}
}
void tbf_free(struct gprs_rlcmac_tbf *tbf)
{
struct msgb *msg;
/* Give final measurement report */
gprs_rlcmac_rssi_rep(tbf);
gprs_rlcmac_lost_rep(tbf);
debug_diagram(tbf->diag, "+---------------+");
debug_diagram(tbf->diag, "| THE END |");
debug_diagram(tbf->diag, "+---------------+");
LOGP(DRLCMAC, LOGL_INFO, "Free %s TBF=%d with TLLI=0x%08x.\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi,
tbf->tlli);
if (tbf->ul_ass_state != GPRS_RLCMAC_UL_ASS_NONE)
LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending uplink "
"assignment. This may not happen, because the "
"assignment message never gets transmitted. Please "
"be shure not to free in this state. PLEASE FIX!\n");
if (tbf->dl_ass_state != GPRS_RLCMAC_DL_ASS_NONE)
LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending downlink "
"assignment. This may not happen, because the "
"assignment message never gets transmitted. Please "
"be shure not to free in this state. PLEASE FIX!\n");
tbf_timer_stop(tbf);
while ((msg = msgb_dequeue(&tbf->llc_queue)))
msgb_free(msg);
tbf_unlink_pdch(tbf);
llist_del(&tbf->list);
LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF ends here **********\n");
talloc_free(tbf);
}
int tbf_update(struct gprs_rlcmac_bts *bts,
struct gprs_rlcmac_tbf *tbf)
{
struct gprs_rlcmac_tbf *ul_tbf = NULL;
int rc;
LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF update **********\n");
if (tbf->direction != GPRS_RLCMAC_DL_TBF)
return -EINVAL;
if (!tbf->ms_class) {
LOGP(DRLCMAC, LOGL_DEBUG, "- Cannot update, no class\n");
return -EINVAL;
}
ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF);
tbf_unlink_pdch(tbf);
rc = bts->alloc_algorithm(bts, ul_tbf, tbf, bts->alloc_algorithm_curst, 0);
/* if no ressource */
if (rc < 0) {
LOGP(DRLCMAC, LOGL_ERROR, "No ressource after update???\n");
return -rc;
}
return 0;
}
int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf)
{
if (tbf->control_ts == 0xff)
LOGP(DRLCMAC, LOGL_INFO, "- Setting Control TS %d\n",
tbf->first_common_ts);
else if (tbf->control_ts != tbf->first_common_ts)
LOGP(DRLCMAC, LOGL_INFO, "- Changing Control TS %d\n",
tbf->first_common_ts);
tbf->control_ts = tbf->first_common_ts;
return 0;
}
static const char *tbf_state_name[] = {
"NULL",
"ASSIGN",
"FLOW",
"FINISHED",
"WAIT RELEASE",
"RELEASING",
};
void tbf_new_state(struct gprs_rlcmac_tbf *tbf,
enum gprs_rlcmac_tbf_state state)
{
debug_diagram(tbf->diag, "->%s", tbf_state_name[state]);
LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d changes state from %s to %s\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi,
tbf_state_name[tbf->state], tbf_state_name[state]);
tbf->set_state(state);
}
void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
unsigned int seconds, unsigned int microseconds)
{
if (!osmo_timer_pending(&tbf->timer))
LOGP(DRLCMAC, LOGL_DEBUG, "Starting %s TBF=%d timer %u.\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL",
tbf->tfi, T);
else
LOGP(DRLCMAC, LOGL_DEBUG, "Restarting %s TBF=%d timer %u "
"while old timer %u pending \n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL",
tbf->tfi, T, tbf->T);
tbf->T = T;
tbf->num_T_exp = 0;
/* Tunning timers can be safely re-scheduled. */
tbf->timer.data = tbf;
tbf->timer.cb = &tbf_timer_cb;
osmo_timer_schedule(&tbf->timer, seconds, microseconds);
}
void tbf_timer_stop(struct gprs_rlcmac_tbf *tbf)
{
if (osmo_timer_pending(&tbf->timer)) {
LOGP(DRLCMAC, LOGL_DEBUG, "Stopping %s TBF=%d timer %u.\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL",
tbf->tfi, tbf->T);
osmo_timer_del(&tbf->timer);
}
}
/* lookup TBF Entity (by TFI) */
struct gprs_rlcmac_tbf *tbf_by_tfi(struct gprs_rlcmac_bts *bts,
uint8_t tfi, uint8_t trx, enum gprs_rlcmac_tbf_direction dir)
{
struct gprs_rlcmac_tbf *tbf;
if (tfi >= 32 || trx >= 8)
return NULL;
if (dir == GPRS_RLCMAC_UL_TBF)
tbf = bts->trx[trx].ul_tbf[tfi];
else
tbf = bts->trx[trx].dl_tbf[tfi];
if (!tbf)
return NULL;
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING))
return tbf;
return NULL;
}
/* search for active downlink or uplink tbf */
struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli,
enum gprs_rlcmac_tbf_direction dir)
{
struct gprs_rlcmac_tbf *tbf;
if (dir == GPRS_RLCMAC_UL_TBF) {
llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
&& tbf->tlli == tlli && tbf->tlli_valid)
return tbf;
}
} else {
llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
&& tbf->tlli == tlli)
return tbf;
}
}
return NULL;
}
struct gprs_rlcmac_tbf *tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
{
struct gprs_rlcmac_tbf *tbf;
/* only one TBF can poll on specific TS/FN, because scheduler can only
* schedule one downlink control block (with polling) at a FN per TS */
llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
&& tbf->poll_fn == fn && tbf->trx_no == trx
&& tbf->control_ts == ts)
return tbf;
}
llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
&& tbf->poll_fn == fn && tbf->trx_no == trx
&& tbf->control_ts == ts)
return tbf;
}
return NULL;
}
struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts,
struct gprs_rlcmac_tbf *old_tbf, enum gprs_rlcmac_tbf_direction dir,
uint8_t tfi, uint8_t trx,
uint8_t ms_class, uint8_t single_slot)
{
struct gprs_rlcmac_tbf *tbf;
int rc;
#ifdef DEBUG_DIAGRAM
/* hunt for first free number in diagram */
int diagram_num;
for (diagram_num = 0; ; diagram_num++) {
llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
if (tbf->diag == diagram_num)
goto next_diagram;
}
llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
if (tbf->diag == diagram_num)
goto next_diagram;
}
break;
next_diagram:
continue;
}
#endif
LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n");
LOGP(DRLCMAC, LOGL_INFO, "Allocating %s TBF: TFI=%d TRX=%d "
"MS_CLASS=%d\n", (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL",
tfi, trx, ms_class);
if (trx >= 8 || tfi >= 32)
return NULL;
tbf = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_tbf);
if (!tbf)
return NULL;
#ifdef DEBUG_DIAGRAM
tbf->diag = diagram_num;
#endif
tbf->direction = dir;
tbf->tfi = tfi;
tbf->trx_no = trx;
tbf->trx = &bts->trx[trx];
tbf->arfcn = bts->trx[trx].arfcn;
tbf->ms_class = ms_class;
tbf->ws = 64;
tbf->sns = 128;
/* select algorithm */
rc = bts->alloc_algorithm(bts, old_tbf, tbf, bts->alloc_algorithm_curst,
single_slot);
/* if no ressource */
if (rc < 0) {
talloc_free(tbf);
return NULL;
}
/* assign control ts */
tbf->control_ts = 0xff;
rc = tbf_assign_control_ts(tbf);
/* if no ressource */
if (rc < 0) {
talloc_free(tbf);
return NULL;
}
/* set timestamp */
gettimeofday(&tbf->meas.dl_bw_tv, NULL);
gettimeofday(&tbf->meas.rssi_tv, NULL);
gettimeofday(&tbf->meas.dl_loss_tv, NULL);
INIT_LLIST_HEAD(&tbf->llc_queue);
if (dir == GPRS_RLCMAC_UL_TBF)
llist_add(&tbf->list, &gprs_rlcmac_ul_tbfs);
else
llist_add(&tbf->list, &gprs_rlcmac_dl_tbfs);
debug_diagram(tbf->diag, "+-----------------+");
debug_diagram(tbf->diag, "|NEW %s TBF TFI=%2d|",
(dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi);
debug_diagram(tbf->diag, "+-----------------+");
return tbf;
}
void tbf_timer_cb(void *_tbf)
{
struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi,
tbf->T);
tbf->num_T_exp++;
switch (tbf->T) {
#ifdef DEBUG_DL_ASS_IDLE
case 1234:
gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi);
break;
#endif
case 0: /* assignment */
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) {
if (tbf->state_is(GPRS_RLCMAC_ASSIGN)) {
LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to "
"PACCH assignment timeout.\n");
tbf_free(tbf);
} else
LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not "
"in assign state\n");
}
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) {
/* change state to FLOW, so scheduler will start transmission */
tbf->dir.dl.wait_confirm = 0;
if (tbf->state_is(GPRS_RLCMAC_ASSIGN)) {
tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
tbf_assign_control_ts(tbf);
} else
LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after "
"IMM.ASS confirm\n");
}
break;
case 3169:
case 3191:
case 3195:
LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during "
"transsmission\n", tbf->T);
tbf->rlcmac_diag();
/* fall through */
case 3193:
if (tbf->T == 3193)
debug_diagram(tbf->diag, "T3193 timeout");
LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n");
/* free TBF */
tbf_free(tbf);
break;
default:
LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n",
tbf->T);
}
}
int gprs_rlcmac_tbf::rlcmac_diag()
{
if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n");
if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n");
if ((state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n");
else if (direction == GPRS_RLCMAC_UL_TBF)
LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n");
if ((state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n");
else if (direction == GPRS_RLCMAC_DL_TBF)
LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n");
return 0;
}
void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx)
{
for (uint8_t tfi = 0; tfi < 32; tfi++) {
struct gprs_rlcmac_tbf *tbf;
tbf = trx->ul_tbf[tfi];
if (tbf)
tbf_free(tbf);
tbf = trx->dl_tbf[tfi];
if (tbf)
tbf_free(tbf);
}
}
void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_pdch *pdch)
{
for (uint8_t tfi = 0; tfi < 32; tfi++) {
struct gprs_rlcmac_tbf *tbf;
tbf = pdch->ul_tbf[tfi];
if (tbf)
tbf_free(tbf);
tbf = pdch->dl_tbf[tfi];
if (tbf)
tbf_free(tbf);
}
}
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