260 lines
6.1 KiB
C
260 lines
6.1 KiB
C
/* osmobts_sock.cpp
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*
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/timer.h>
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#include <pcu_l1_if.h>
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#include <gprs_debug.h>
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#include <gprs_bssgp_pcu.h>
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#include <osmocom/pcu/pcuif_proto.h>
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#include <bts.h>
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#include <tbf.h>
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#include <pdch.h>
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int l1if_close_pdch(void *obj);
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/*
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* osmo-bts PCU socket functions
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*/
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static struct {
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struct osmo_fd conn_bfd; /* fd for connection to the BTS */
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struct osmo_timer_list timer; /* socket connect retry timer */
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struct llist_head upqueue; /* queue for sending messages */
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} pcu_sock_state;
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static void pcu_sock_timeout(void *_priv)
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{
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pcu_l1if_open();
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}
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static void pcu_tx_txt_retry(void *_priv)
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{
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struct gprs_rlcmac_bts *bts;
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bool retry = llist_empty(&the_pcu->bts_list);
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llist_for_each_entry(bts, &the_pcu->bts_list, list) {
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if (bts->active)
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continue;
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retry = true;
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pcu_tx_txt_ind(PCU_VERSION, "%s", PACKAGE_VERSION);
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break;
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}
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/* If no BTS (or not all) yet active, retry */
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if (retry)
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osmo_timer_schedule(&pcu_sock_state.timer, 5, 0);
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}
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int pcu_sock_send(struct msgb *msg)
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{
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struct osmo_fd *conn_bfd;
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conn_bfd = &pcu_sock_state.conn_bfd;
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if (conn_bfd->fd <= 0) {
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LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping "
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"message\n");
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return -EIO;
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}
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msgb_enqueue(&pcu_sock_state.upqueue, msg);
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osmo_fd_write_enable(conn_bfd);
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return 0;
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}
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static void pcu_sock_close(int lost)
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{
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struct osmo_fd *bfd = &pcu_sock_state.conn_bfd;
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struct gprs_rlcmac_bts *bts;
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uint8_t trx, ts;
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LOGP(DL1IF, LOGL_NOTICE, "PCU socket has %s connection\n",
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(lost) ? "LOST" : "closed");
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close(bfd->fd);
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bfd->fd = -1;
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osmo_fd_unregister(bfd);
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/* flush the queue */
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while (!llist_empty(&pcu_sock_state.upqueue)) {
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struct msgb *msg = msgb_dequeue(&pcu_sock_state.upqueue);
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msgb_free(msg);
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}
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llist_for_each_entry(bts, &the_pcu->bts_list, list) {
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/* disable all slots, kick all TBFs */
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for (trx = 0; trx < 8; trx++) {
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#ifdef ENABLE_DIRECT_PHY
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if (bts->trx[trx].fl1h) {
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l1if_close_pdch(bts->trx[trx].fl1h);
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bts->trx[trx].fl1h = NULL;
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}
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#endif
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for (ts = 0; ts < 8; ts++)
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if (pdch_is_enabled(&bts->trx[trx].pdch[ts]))
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pdch_disable(&bts->trx[trx].pdch[ts]);
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/* FIXME: NOT ALL RESOURCES are freed in this case... inconsistent with the other code. Share the code with pcu_l1if.c
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for the reset. */
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bts_trx_free_all_tbf(&bts->trx[trx]);
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}
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gprs_bssgp_destroy(bts);
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}
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exit(0);
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}
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static int pcu_sock_read(struct osmo_fd *bfd)
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{
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const size_t max_len = sizeof(struct gsm_pcu_if) + 1000;
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uint8_t *buf = alloca(max_len);
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struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *)buf;
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int rc;
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rc = recv(bfd->fd, buf, max_len, 0);
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if (rc < 0 && errno == EAGAIN)
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return 0; /* Try again later */
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if (rc <= 0) {
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pcu_sock_close(1);
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return -EIO;
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}
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if (rc < PCUIF_HDR_SIZE) {
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LOGP(DL1IF, LOGL_ERROR, "Received %d bytes on PCU Socket, but primitive "
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"hdr size is %zu, discarding\n", rc, PCUIF_HDR_SIZE);
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return -EINVAL;
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}
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return pcu_rx(pcu_prim, rc);
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}
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static int pcu_sock_write(struct osmo_fd *bfd)
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{
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int rc;
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while (!llist_empty(&pcu_sock_state.upqueue)) {
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struct msgb *msg, *msg2;
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struct gsm_pcu_if *pcu_prim;
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/* peek at the beginning of the queue */
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msg = llist_entry(pcu_sock_state.upqueue.next, struct msgb, list);
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pcu_prim = (struct gsm_pcu_if *)msg->data;
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osmo_fd_write_disable(bfd);
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/* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
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if (!msgb_length(msg)) {
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LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO "
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"bytes!\n", pcu_prim->msg_type);
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goto dontsend;
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}
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/* try to send it over the socket */
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rc = write(bfd->fd, msgb_data(msg), msgb_length(msg));
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if (rc == 0)
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goto close;
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if (rc < 0) {
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if (errno == EAGAIN) {
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osmo_fd_write_enable(bfd);
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break;
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}
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goto close;
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}
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dontsend:
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/* _after_ we send it, we can deueue */
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msg2 = msgb_dequeue(&pcu_sock_state.upqueue);
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assert(msg == msg2);
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msgb_free(msg);
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}
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return 0;
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close:
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pcu_sock_close(1);
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return -1;
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}
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static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags)
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{
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int rc = 0;
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if (flags & OSMO_FD_READ)
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rc = pcu_sock_read(bfd);
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if (rc < 0)
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return rc;
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if (flags & OSMO_FD_WRITE)
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rc = pcu_sock_write(bfd);
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return rc;
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}
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int pcu_l1if_open(void)
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{
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int rc;
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LOGP(DL1IF, LOGL_INFO, "Opening OsmoPCU L1 interface to OsmoBTS\n");
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memset(&pcu_sock_state, 0x00, sizeof(pcu_sock_state));
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INIT_LLIST_HEAD(&pcu_sock_state.upqueue);
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rc = osmo_sock_unix_init_ofd(&pcu_sock_state.conn_bfd, SOCK_SEQPACKET, 0,
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the_pcu->pcu_sock_path, OSMO_SOCK_F_CONNECT);
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if (rc < 0) {
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LOGP(DL1IF, LOGL_ERROR, "Failed to connect to the BTS (%s). "
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"Retrying...\n", the_pcu->pcu_sock_path);
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osmo_timer_setup(&pcu_sock_state.timer, pcu_sock_timeout, NULL);
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osmo_timer_schedule(&pcu_sock_state.timer, 5, 0);
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return 0;
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}
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pcu_sock_state.conn_bfd.cb = pcu_sock_cb;
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pcu_sock_state.conn_bfd.data = NULL;
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LOGP(DL1IF, LOGL_NOTICE, "osmo-bts PCU socket %s has been connected\n",
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the_pcu->pcu_sock_path);
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pcu_tx_txt_ind(PCU_VERSION, "%s", PACKAGE_VERSION);
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/* Schedule a timer so we keep trying until the BTS becomes active. */
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osmo_timer_setup(&pcu_sock_state.timer, pcu_tx_txt_retry, NULL);
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osmo_timer_schedule(&pcu_sock_state.timer, 5, 0);
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return 0;
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}
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void pcu_l1if_close(void)
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{
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struct osmo_fd *bfd;
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osmo_timer_del(&pcu_sock_state.timer);
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bfd = &pcu_sock_state.conn_bfd;
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if (bfd->fd > 0)
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pcu_sock_close(0);
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}
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