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..f8c0ecc0
--- /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/OsmoBSC\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);
+}