lapdm: Create a simple test case to transmit data between both ends
This is testing the establishment of two ends (BTS, MS) one is in
the polling mode as used by osmo-bts. Transfer data between the two
ends. The sent data is not verified though. This should be followed
up soon.
diff --git a/tests/lapd/lapd_test.c b/tests/lapd/lapd_test.c
new file mode 100644
index 0000000..e6b10b6
--- /dev/null
+++ b/tests/lapd/lapd_test.c
@@ -0,0 +1,258 @@
+/*
+ * (C) 2011 by Holger Hans Peter Freyther
+ * (C) 2011 by On-Waves
+ * All Rights Reserved
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <osmocom/core/logging.h>
+#include <osmocom/gsm/lapdm.h>
+#include <osmocom/gsm/rsl.h>
+
+#include <errno.h>
+
+#include <string.h>
+
+#define CHECK_RC(rc) \
+ if (rc != 0) { \
+ printf("Operation failed rc=%d on %s:%d\n", rc, __FILE__, __LINE__); \
+ abort(); \
+ }
+
+#define ASSERT(exp) \
+ if (!(exp)) { \
+ printf("Assert failed %s %s:%d\n", #exp, __FILE__, __LINE__); \
+ abort(); \
+ }
+
+
+static struct log_info info = {};
+
+struct lapdm_polling_state {
+ struct lapdm_channel *bts;
+ int bts_read;
+
+ struct lapdm_channel *ms;
+ int ms_read;
+};
+
+static struct msgb *msgb_from_array(const uint8_t *data, int len)
+{
+ struct msgb *msg = msgb_alloc_headroom(4096, 128, "data");
+ msg->l3h = msgb_put(msg, len);
+ memcpy(msg->l3h, data, len);
+ return msg;
+}
+
+
+static struct msgb *create_cm_serv_req(void)
+{
+ struct msgb *msg;
+ static const uint8_t cm[] = {
+ 0x05, 0x24, 0x31, 0x03, 0x50, 0x18, 0x93, 0x08,
+ 0x29, 0x47, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80,
+ };
+
+ msg = msgb_from_array(cm, sizeof(cm));
+ rsl_rll_push_l3(msg, RSL_MT_EST_REQ, 0, 0, 1);
+ return msg;
+}
+
+static struct msgb *create_mm_id_req(void)
+{
+ struct msgb *msg;
+ /* okay... not an identity request */
+ static const uint8_t mm[] = {
+ 0x05, 0x24, 0x31, 0x03, 0x50, 0x18, 0x93, 0x08,
+ 0x29, 0x47, 0x80, 0x00,
+ };
+
+ msg = msgb_from_array(mm, sizeof(mm));
+ rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, 0, 0, 1);
+ return msg;
+}
+
+static struct msgb *create_dummy_data_req(void)
+{
+ struct msgb *msg;
+ /* okay... not an identity request */
+ static const uint8_t dummy1[] = {
+ 0xab, 0x03, 0x30, 0x60, 0x06,
+ };
+
+ msg = msgb_from_array(dummy1, sizeof(dummy1));
+ rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, 0, 0, 1);
+ return msg;
+}
+
+static int send(struct msgb *in_msg, struct lapdm_channel *chan)
+{
+ struct osmo_phsap_prim pp;
+ struct msgb *msg;
+ int rc;
+
+ msg = msgb_alloc_headroom(128, 64, "PH-DATA.ind");
+ osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA,
+ PRIM_OP_INDICATION, msg);
+ /* copy over actual MAC block */
+ msg->l2h = msgb_put(msg, msgb_l2len(in_msg));
+ memcpy(msg->l2h, in_msg->l2h, msgb_l2len(in_msg));
+
+ /* LAPDm requires those... */
+ pp.u.data.chan_nr = 0;
+ pp.u.data.link_id = 0;
+ /* feed into the LAPDm code of libosmogsm */
+ rc = lapdm_phsap_up(&pp.oph, &chan->lapdm_dcch);
+ ASSERT(rc == 0 || rc == -EBUSY);
+ return 0;
+}
+
+/*
+ * I get called from the LAPDm code when something was sent my way...
+ */
+static int bts_to_ms_tx_cb(struct msgb *in_msg, struct lapdm_entity *le, void *_ctx)
+{
+ struct lapdm_polling_state *state = _ctx;
+
+ state->bts_read += 1;
+
+ printf("%s: MS->BTS(us) message %d\n", __func__, msgb_length(in_msg));
+ msgb_free(in_msg);
+
+ return 0;
+}
+
+static int ms_to_bts_l1_cb(struct osmo_prim_hdr *oph, void *_ctx)
+{
+ int rc;
+ struct lapdm_polling_state *state = _ctx;
+ printf("%s: MS(us) -> BTS prim message\n", __func__);
+
+ /* i stuff it into the LAPDm channel of the BTS */
+ rc = send(oph->msg, state->bts);
+ msgb_free(oph->msg);
+}
+
+static int ms_to_bts_tx_cb(struct msgb *msg, struct lapdm_entity *le, void *_ctx)
+{
+ struct lapdm_polling_state *state = _ctx;
+
+ printf("%s: BTS->MS(us) message %d\n", __func__, msgb_length(msg));
+
+ if (state->ms_read == 0) {
+ /* TODO: Verify that this is a: PRIM_DL_EST, PRIM_OP_CONFIRM */
+ } else if (state->ms_read == 1) {
+ /* TODO: Verify that this is: create_mm_id_req() */
+ }
+
+ state->ms_read += 1;
+ msgb_free(msg);
+ return 0;
+}
+
+static void test_lapdm_polling()
+{
+ printf("I do some very simple LAPDm test.\n");
+
+ int rc;
+ struct lapdm_polling_state test_state;
+ struct osmo_phsap_prim pp;
+
+ /* Configure LAPDm on both sides */
+ struct lapdm_channel bts_to_ms_channel;
+ struct lapdm_channel ms_to_bts_channel;
+ memset(&bts_to_ms_channel, 0, sizeof(bts_to_ms_channel));
+ memset(&ms_to_bts_channel, 0, sizeof(ms_to_bts_channel));
+
+ memset(&test_state, 0, sizeof(test_state));
+ test_state.bts = &bts_to_ms_channel;
+ test_state.ms = &ms_to_bts_channel;
+
+ /* BTS to MS in polling mode */
+ lapdm_channel_init(&bts_to_ms_channel, LAPDM_MODE_BTS);
+ lapdm_channel_set_flags(&bts_to_ms_channel, LAPDM_ENT_F_POLLING_ONLY);
+ lapdm_channel_set_l1(&bts_to_ms_channel, NULL, &test_state);
+ lapdm_channel_set_l3(&bts_to_ms_channel, bts_to_ms_tx_cb, &test_state);
+
+ /* MS to BTS in direct mode */
+ lapdm_channel_init(&ms_to_bts_channel, LAPDM_MODE_MS);
+ lapdm_channel_set_l1(&ms_to_bts_channel, ms_to_bts_l1_cb, &test_state);
+ lapdm_channel_set_l3(&ms_to_bts_channel, ms_to_bts_tx_cb, &test_state);
+
+ /*
+ * We try to send messages from the MS to the BTS to the MS..
+ */
+ /* 1. Start with MS -> BTS, BTS should have a pending message */
+ printf("Establishing link.\n");
+ lapdm_rslms_recvmsg(create_cm_serv_req(), &ms_to_bts_channel);
+
+ /* 2. Poll on the BTS for sending out a confirmation */
+ printf("\nConfirming\n");
+ ASSERT(test_state.bts_read == 1)
+ rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
+ CHECK_RC(rc);
+ ASSERT(pp.oph.msg->data == pp.oph.msg->l2h);
+ send(pp.oph.msg, &ms_to_bts_channel);
+ msgb_free(pp.oph.msg);
+ ASSERT(test_state.ms_read == 1);
+
+ /* 3. Send some data to the MS */
+ printf("\nSending back to MS\n");
+ lapdm_rslms_recvmsg(create_mm_id_req(), &bts_to_ms_channel);
+ rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
+ CHECK_RC(rc);
+ send(pp.oph.msg, &ms_to_bts_channel);
+ msgb_free(pp.oph.msg);
+ ASSERT(test_state.ms_read == 2);
+
+ /* verify that there is nothing more to poll */
+ rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
+ ASSERT(rc < 0);
+
+ /* 3. And back to the BTS */
+ printf("\nSending back to BTS\n");
+ ASSERT(test_state.ms_read == 2);
+ lapdm_rslms_recvmsg(create_dummy_data_req(), &ms_to_bts_channel);
+
+
+ /* 4. And back to the MS */
+ ASSERT(test_state.bts_read == 2)
+ ASSERT(test_state.ms_read == 2);
+ rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
+ CHECK_RC(rc);
+ send(pp.oph.msg, &ms_to_bts_channel);
+ ASSERT(test_state.ms_read == 2);
+ msgb_free(pp.oph.msg);
+
+ /* verify that there is nothing more to poll */
+ rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
+ ASSERT(rc < 0);
+
+ /* clean up */
+ lapdm_channel_exit(&bts_to_ms_channel);
+ lapdm_channel_exit(&ms_to_bts_channel);
+}
+
+int main(int argc, char **argv)
+{
+ osmo_init_logging(&info);
+
+ test_lapdm_polling();
+ printf("Success.\n");
+
+ return 0;
+}