diff options
Diffstat (limited to 'src/pcuif_sock.c')
-rw-r--r-- | src/pcuif_sock.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/src/pcuif_sock.c b/src/pcuif_sock.c new file mode 100644 index 00000000..c77605fb --- /dev/null +++ b/src/pcuif_sock.c @@ -0,0 +1,259 @@ +/* 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. + */ + +#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 <pcu_l1_if_phy.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> + +/* + * 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"); + + osmo_fd_unregister(bfd); + close(bfd->fd); + bfd->fd = -1; + + /* 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_trx(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) { + LOGP(DL1IF, LOGL_ERROR, "%s: recv() failed with rc=%d errno=%d\n", __func__, rc, errno); + 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 v%u to OsmoBTS\n", PCU_IF_VERSION); + + 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); +} |