Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/osmobts_sock.c

263 lines
6.3 KiB

/* osmobts_sock.cpp
*
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
*
* 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 <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <osmocom/core/select.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/timer.h>
#include <pcu_l1_if.h>
#include <gprs_debug.h>
#include <gprs_bssgp_pcu.h>
#include <osmocom/pcu/pcuif_proto.h>
#include <bts.h>
#include <tbf.h>
#include <pdch.h>
int l1if_close_pdch(void *obj);
/*
* osmo-bts PCU socket functions
*/
static struct {
struct osmo_fd conn_bfd; /* fd for connection to the BTS */
struct osmo_timer_list timer; /* socket connect retry timer */
struct llist_head upqueue; /* queue for sending messages */
} pcu_sock_state;
static void pcu_sock_timeout(void *_priv)
{
pcu_l1if_open();
}
static void pcu_tx_txt_retry(void *_priv)
{
struct gprs_rlcmac_bts *bts;
bool retry = llist_empty(&the_pcu->bts_list);
llist_for_each_entry(bts, &the_pcu->bts_list, list) {
if (bts->active)
continue;
retry = true;
pcu_tx_txt_ind(PCU_VERSION, "%s", PACKAGE_VERSION);
break;
}
/* If no BTS (or not all) yet active, retry */
if (retry)
osmo_timer_schedule(&pcu_sock_state.timer, 5, 0);
}
int pcu_sock_send(struct msgb *msg)
{
struct osmo_fd *conn_bfd;
conn_bfd = &pcu_sock_state.conn_bfd;
if (conn_bfd->fd <= 0) {
LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping "
"message\n");
return -EIO;
}
msgb_enqueue(&pcu_sock_state.upqueue, msg);
osmo_fd_write_enable(conn_bfd);
return 0;
}
static void pcu_sock_close(int lost)
{
struct osmo_fd *bfd = &pcu_sock_state.conn_bfd;
struct gprs_rlcmac_bts *bts;
uint8_t trx, ts;
LOGP(DL1IF, LOGL_NOTICE, "PCU socket has %s connection\n",
(lost) ? "LOST" : "closed");
close(bfd->fd);
bfd->fd = -1;
osmo_fd_unregister(bfd);
/* flush the queue */
while (!llist_empty(&pcu_sock_state.upqueue)) {
struct msgb *msg = msgb_dequeue(&pcu_sock_state.upqueue);
msgb_free(msg);
}
llist_for_each_entry(bts, &the_pcu->bts_list, list) {
/* disable all slots, kick all TBFs */
for (trx = 0; trx < 8; trx++) {
#ifdef ENABLE_DIRECT_PHY
if (bts->trx[trx].fl1h) {
l1if_close_pdch(bts->trx[trx].fl1h);
bts->trx[trx].fl1h = NULL;
}
#endif
for (ts = 0; ts < 8; ts++)
if (pdch_is_enabled(&bts->trx[trx].pdch[ts]))
pdch_disable(&bts->trx[trx].pdch[ts]);
/* FIXME: NOT ALL RESOURCES are freed in this case... inconsistent with the other code. Share the code with pcu_l1if.c
for the reset. */
bts_trx_free_all_tbf(&bts->trx[trx]);
}
gprs_bssgp_destroy(bts);
}
exit(0);
}
static int pcu_sock_read(struct osmo_fd *bfd)
{
const size_t max_len = sizeof(struct gsm_pcu_if) + 1000;
uint8_t *buf = alloca(max_len);
struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *)buf;
int rc;
rc = recv(bfd->fd, buf, max_len, 0);
if (rc < 0 && errno == EAGAIN)
return 0; /* Try again later */
if (rc <= 0) {
pcu_sock_close(1);
return -EIO;
}
if (rc < PCUIF_HDR_SIZE) {
LOGP(DL1IF, LOGL_ERROR, "Received %d bytes on PCU Socket, but primitive "
"hdr size is %zu, discarding\n", rc, PCUIF_HDR_SIZE);
return -EINVAL;
}
return pcu_rx(pcu_prim, rc);
}
static int pcu_sock_write(struct osmo_fd *bfd)
{
int rc;
while (!llist_empty(&pcu_sock_state.upqueue)) {
struct msgb *msg, *msg2;
struct gsm_pcu_if *pcu_prim;
/* peek at the beginning of the queue */
msg = llist_entry(pcu_sock_state.upqueue.next, struct msgb, list);
pcu_prim = (struct gsm_pcu_if *)msg->data;
osmo_fd_write_disable(bfd);
/* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
if (!msgb_length(msg)) {
LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO "
"bytes!\n", pcu_prim->msg_type);
goto dontsend;
}
/* try to send it over the socket */
rc = write(bfd->fd, msgb_data(msg), msgb_length(msg));
if (rc == 0)
goto close;
if (rc < 0) {
if (errno == EAGAIN) {
osmo_fd_write_enable(bfd);
break;
}
goto close;
}
dontsend:
/* _after_ we send it, we can deueue */
msg2 = msgb_dequeue(&pcu_sock_state.upqueue);
assert(msg == msg2);
msgb_free(msg);
}
return 0;
close:
pcu_sock_close(1);
return -1;
}
static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags)
{
int rc = 0;
if (flags & OSMO_FD_READ)
rc = pcu_sock_read(bfd);
if (rc < 0)
return rc;
if (flags & OSMO_FD_WRITE)
rc = pcu_sock_write(bfd);
return rc;
}
int pcu_l1if_open(void)
{
int rc;
LOGP(DL1IF, LOGL_INFO, "Opening OsmoPCU L1 interface to OsmoBTS\n");
memset(&pcu_sock_state, 0x00, sizeof(pcu_sock_state));
INIT_LLIST_HEAD(&pcu_sock_state.upqueue);
rc = osmo_sock_unix_init_ofd(&pcu_sock_state.conn_bfd, SOCK_SEQPACKET, 0,
the_pcu->pcu_sock_path, OSMO_SOCK_F_CONNECT);
if (rc < 0) {
LOGP(DL1IF, LOGL_ERROR, "Failed to connect to the BTS (%s). "
"Retrying...\n", the_pcu->pcu_sock_path);
osmo_timer_setup(&pcu_sock_state.timer, pcu_sock_timeout, NULL);
osmo_timer_schedule(&pcu_sock_state.timer, 5, 0);
return 0;
}
pcu_sock_state.conn_bfd.cb = pcu_sock_cb;
pcu_sock_state.conn_bfd.data = NULL;
LOGP(DL1IF, LOGL_NOTICE, "osmo-bts PCU socket %s has been connected\n",
the_pcu->pcu_sock_path);
pcu_tx_txt_ind(PCU_VERSION, "%s", PACKAGE_VERSION);
/* Schedule a timer so we keep trying until the BTS becomes active. */
osmo_timer_setup(&pcu_sock_state.timer, pcu_tx_txt_retry, NULL);
osmo_timer_schedule(&pcu_sock_state.timer, 5, 0);
return 0;
}
void pcu_l1if_close(void)
{
struct osmo_fd *bfd;
osmo_timer_del(&pcu_sock_state.timer);
bfd = &pcu_sock_state.conn_bfd;
if (bfd->fd > 0)
pcu_sock_close(0);
}