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osmo-bts
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osmo-bts/src/common/bts.c

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/* BTS support code common to all supported BTS models */
/* (C) 2011 by Andreas Eversberg <jolly@eversberg.eu>
* (C) 2011 by Harald Welte <laforge@gnumonks.org>
*
* 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 <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <osmocom/core/select.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gsm/protocol/gsm_12_21.h>
#include <osmocom/gsm/lapdm.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/abis.h>
#include <osmo-bts/bts.h>
#include <osmo-bts/rsl.h>
#include <osmo-bts/oml.h>
void *tall_bts_ctx;
int bts_init(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb;
bts->role = btsb = talloc_zero(bts, struct gsm_bts_role_bts);
INIT_LLIST_HEAD(&btsb->agch_queue);
/* FIXME: make those parameters configurable */
btsb->paging_state = paging_init(btsb, 200, 0);
return bts_model_init(bts);
}
#if 0
struct osmobts_lchan *lchan_by_channelnr(struct osmobts_trx *trx,
uint8_t channelnr)
{
uint8_t ts = channelnr & ~RSL_CHAN_NR_MASK;
uint8_t type = channelnr & RSL_CHAN_NR_MASK;
uint8_t sub = 0;
struct osmobts_slot *slot = trx->slot[ts];
if ((type & 0xf0) == RSL_CHAN_Lm_ACCHs) {
sub = (channelnr >> 3) & 1;
type = RSL_CHAN_Lm_ACCHs;
} else
if ((type & 0xe0) == RSL_CHAN_SDCCH4_ACCH) {
sub = (channelnr >> 3) & 3;
type = RSL_CHAN_SDCCH4_ACCH;
} else
if ((type & 0xc0) == RSL_CHAN_SDCCH8_ACCH) {
sub = (channelnr >> 3) & 7;
type = RSL_CHAN_SDCCH8_ACCH;
} else
if (type == RSL_CHAN_BCCH
|| type == RSL_CHAN_RACH
|| type == RSL_CHAN_PCH_AGCH) {
if (!slot->has_bcch) {
LOGP(DSUM, LOGL_NOTICE, "Slot %d has no BCCH\n", ts);
return NULL;
}
return slot->lchan[0];
} else {
LOGP(DSUM, LOGL_NOTICE, "Unknown channel type 0x%02x\n", type);
return NULL;
}
if (slot->acch_type == type)
return slot->lchan[sub];
}
LOGP(DSUM, LOGL_NOTICE, "No slot found with channel type 0x%02x\n", type);
return NULL;
}
struct osmocom_bts *create_bts(uint8_t num_trx, char *id)
{
struct osmocom_bts *bts;
struct osmobts_trx *trx;
int i, j;
LOGP(DSUM, LOGL_INFO, "Creating BTS\n");
bts = talloc_zero(l23_ctx, struct osmocom_bts);
if (!bts)
return NULL;
bts->link.bts = bts;
bts->id = id;
for (i = 0; i < num_trx; i++) {
LOGP(DSUM, LOGL_INFO, "Creating TRX %d\n", i);
trx = talloc_zero(l23_ctx, struct osmobts_trx);
if (!trx)
return NULL;
trx->bts = bts;
trx->trx_nr = i;
INIT_LLIST_HEAD(&trx->ms_list);
for (j = 0; j < 8; j++) {
trx->slot[j].trx = trx;
trx->slot[j].slot_nr = j;
trx->slot[j].chan_comb = 0xff; /* not set */
}
trx->link.trx = trx;
bts->trx[i] = trx;
}
bts->num_trx = num_trx;
return bts;
}
int create_ms(struct osmobts_trx *trx, int maskc, uint8_t *maskv_tx,
uint8_t *maskv_rx)
{
struct osmobts_ms *tx_ms, *rx_ms;
int i, j;
int rc;
static char sock_path[] = "/tmp/osmocom_l2.1";
for (i = 0; i < maskc; i++) {
/* create MS */
tx_ms = talloc_zero(l23_ctx, struct osmobts_ms);
printf("%p\n", tx_ms);
if (!tx_ms)
return -ENOMEM;
tx_ms->trx = trx;
rc = layer2_open(&tx_ms->ms, sock_path);
strcpy(tx_ms->ms.name, strchr(sock_path, '.') + 1);
sock_path[strlen(sock_path) - 1]++;
if (rc < 0) {
talloc_free(tx_ms);
return rc;
}
llist_add_tail(&tx_ms->entry, &trx->ms_list);
rx_ms = talloc_zero(l23_ctx, struct osmobts_ms);
rx_ms->trx = trx;
if (!rx_ms)
return -ENOMEM;
rc = layer2_open(&rx_ms->ms, sock_path);
strcpy(rx_ms->ms.name, strchr(sock_path, '.') + 1);
sock_path[strlen(sock_path) - 1]++;
if (rc < 0) {
talloc_free(rx_ms);
return rc;
}
llist_add_tail(&rx_ms->entry, &trx->ms_list);
/* assign to SLOT */
for (j = 0; j < 8; j++) {
if ((maskv_tx[i] & (1 << j)))
trx->slot[j].tx_ms = tx_ms;
if ((maskv_rx[i] & (1 << j)))
trx->slot[j].rx_ms = rx_ms;
}
}
return i;
}
void destroy_lchan(struct osmobts_lchan *lchan)
{
LOGP(DSUM, LOGL_INFO, "Destroying logical channel. (trx=%d ts=%d ss=%d)\n", lchan->slot->trx->trx_nr, lchan->slot->slot_nr, lchan->lchan_nr);
lapdm_exit(&lchan->l2_entity.lapdm_acch);
lapdm_exit(&lchan->l2_entity.lapdm_acch);
if (lchan->rtp.socket_created)
rtp_close_socket(&lchan->rtp);
talloc_free(lchan);
}
/* create and destroy lchan */
void bts_setup_slot(struct osmobts_slot *slot, uint8_t comb)
{
int i, ii;
struct osmobts_lchan *lchan;
uint8_t cbits;
if (slot->chan_comb == comb)
return;
/* destroy old */
for (i = 0; i < 8; i++) {
if (slot->lchan[i])
destroy_lchan(slot->lchan[i]);
slot->lchan[i] = NULL;
}
switch(comb) {
case 0xff:
return;
case NM_CHANC_TCHFull:
cbits = 0x01;
ii = 1;
break;
case NM_CHANC_TCHHalf:
cbits = 0x02;
ii = 2;
break;
case NM_CHANC_BCCHComb:
cbits = 0x04;
ii = 4;
break;
case NM_CHANC_SDCCH:
cbits = 0x08;
ii = 8;
break;
default:
cbits = 0x10;
ii = 0;
}
if (!slot->tx_ms) {
LOGP(DSUM, LOGL_ERROR, "Slot is not available\n");
return;
}
for (i = 0; i < ii; i++) {
LOGP(DSUM, LOGL_INFO, "Creating logical channel. (trx=%d ts=%d ss=%d)\n", slot->trx->trx_nr, slot->slot_nr, i);
lchan = talloc_zero(l23_ctx, struct osmobts_lchan);
lchan->slot = slot;
lchan->lchan_nr = i;
lchan->chan_nr = ((cbits | i) << 3) | slot->slot_nr;
lapdm_init(&lchan->l2_entity.lapdm_dcch, &lchan->l2_entity, &slot->tx_ms->ms);
lapdm_init(&lchan->l2_entity.lapdm_acch, &lchan->l2_entity, &slot->tx_ms->ms);
lapdm_set_bts();
osmol2_register_handler(&lchan->l2_entity, &rsl_tx_rll);
slot->lchan[i] = lchan;
}
}
static void destroy_ms(struct osmobts_ms *ms)
{
layer2_close(&ms->ms);
llist_del(&ms->entry);
talloc_free(ms);
}
void destroy_bts(struct osmocom_bts *bts)
{
int i;
struct osmobts_ms *ms;
for (i = 0; i < bts->num_trx; i++) {
abis_close(&bts->trx[i]->link);
while(!llist_empty(&bts->trx[i]->ms_list)) {
ms = llist_entry(bts->trx[i]->ms_list.next,
struct osmobts_ms, entry);
destroy_ms(ms);
}
if (osmo_timer_pending(&bts->trx[i]->si.timer))
osmo_timer_del(&bts->trx[i]->si.timer);
talloc_free(bts->trx[i]);
bts->trx[i] = NULL;
}
abis_close(&bts->link);
talloc_free(bts);
}
#endif
/* main link is established, send status report */
int bts_link_estab(struct gsm_bts *bts)
{
int i, j;
uint8_t radio_state;
LOGP(DSUM, LOGL_INFO, "Main link established, sending Status'.\n");
oml_mo_state_chg(&bts->site_mgr.mo, NM_OPSTATE_ENABLED, NM_AVSTATE_OK);
oml_mo_state_chg(&bts->mo, NM_OPSTATE_ENABLED, NM_AVSTATE_DEPENDENCY);
for (i = 0; i < bts->num_trx; i++) {
struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, i);
struct ipabis_link *link = (struct ipabis_link *) trx->rsl_link;
radio_state = (link && link->state == LINK_STATE_CONNECT) ? NM_OPSTATE_ENABLED : NM_OPSTATE_DISABLED;
oml_mo_state_chg(&trx->mo, radio_state, NM_AVSTATE_OK);
oml_mo_tx_sw_act_rep(&trx->mo);
oml_mo_state_chg(&trx->bb_transc.mo, NM_OPSTATE_ENABLED, NM_AVSTATE_OK);
oml_mo_tx_sw_act_rep(&trx->bb_transc.mo);
for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
struct gsm_bts_trx_ts *ts = &trx->ts[j];
oml_mo_state_chg(&ts->mo, NM_OPSTATE_DISABLED, NM_AVSTATE_DEPENDENCY);
}
}
return 0;
}
/* RSL link is established, send status report */
int trx_link_estab(struct gsm_bts_trx *trx)
{
struct ipabis_link *link = (struct ipabis_link *) trx->rsl_link;
uint8_t radio_state = (link->state == LINK_STATE_CONNECT) ? NM_OPSTATE_ENABLED : NM_OPSTATE_DISABLED;
LOGP(DSUM, LOGL_INFO, "RSL link (TRX %02x) state changed to %s, sending Status'.\n",
trx->nr, (link->state == LINK_STATE_CONNECT) ? "up" : "down");
oml_mo_state_chg(&trx->mo, radio_state, NM_AVSTATE_OK);
if (link->state == LINK_STATE_CONNECT)
rsl_tx_rf_res(trx);
return 0;
}
void bts_new_si(void *arg)
{
struct osmobts_trx *trx = arg;
int i;
#if 0
if (osmo_timer_pending(&trx->si.timer))
return;
i = 0;
while(i < BTS_SI_NUM) {
if ((trx->si.flags[i] & BTS_SI_NEW))
break;
i++;
}
if (i == BTS_SI_NUM)
return;
if ((trx->si.flags[i] & BTS_SI_USE))
LOGP(DSUM, LOGL_INFO, "Setting SYSTEM INFORMATION %s.\n", bts_si_name[i]);
else
LOGP(DSUM, LOGL_INFO, "Removing SYSTEM INFORMATION %s.\n", bts_si_name[i]);
trx->si.flags[i] &= ~BTS_SI_NEW;
/* distribute */
printf("TODO: send SI update to L1\n");
/* delay until next SI */
trx->si.timer.cb = bts_new_si;
trx->si.timer.data = trx;
osmo_timer_schedule(&trx->si.timer, 0, 200000);
#endif
}
int lchan_init_lapdm(struct gsm_lchan *lchan)
{
struct lapdm_channel *lc = &lchan->lapdm_ch;
lapdm_channel_init(lc, LAPDM_MODE_BTS);
lapdm_channel_set_flags(lc, LAPDM_ENT_F_POLLING_ONLY);
lapdm_channel_set_l1(lc, NULL, lchan);
lapdm_channel_set_l3(lc, lapdm_rll_tx_cb, lchan);
return 0;
}
int bts_agch_enqueue(struct gsm_bts *bts, struct msgb *msg)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);;
/* FIXME: implement max queue length */
llist_add_tail(&msg->list, &btsb->agch_queue);
return 0;
}
struct msgb *bts_agch_dequeue(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);;
struct msgb *msg;
if (llist_empty(&btsb->agch_queue))
return NULL;
msg = llist_entry(btsb->agch_queue.next, struct msgb, list);
llist_del(&msg->list);
return msg;
}
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