/* get next frame from the tx queue. because the ms has multiple datalinks,
* each datalink's queue is read round-robin.
*/
static int l2_ph_data_conf(struct msgb *msg, struct lapdm_entity *le)
{
struct osmo_phsap_prim pp;
/* we may send again */
le->tx_pending = 0;
/* free confirm message */
if (msg)
msgb_free(msg);
if (lapdm_phsap_dequeue_prim(le, &pp) < 0) {
/* no message in all queues */
/* If user didn't request PH-EMPTY_FRAME.req, abort */
if (!(le->flags & LAPDM_ENT_F_EMPTY_FRAME))
return 0;
/* otherwise, send PH-EMPTY_FRAME.req */
osmo_prim_init(&pp.oph, SAP_GSM_PH,
PRIM_PH_EMPTY_FRAME,
PRIM_OP_REQUEST, NULL);
} else {
le->tx_pending = 1;
}
return le->l1_prim_cb(&pp.oph, le->l1_ctx);
}
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, but let's move data/l2h apart */
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);
/* check sending an empty L3 message fails */
rc = lapdm_rslms_recvmsg(create_empty_msg(), &bts_to_ms_channel);
ASSERT(rc == -1);
ASSERT(test_state.ms_read == 2);
/* clean up */
lapdm_channel_exit(&bts_to_ms_channel);
lapdm_channel_exit(&ms_to_bts_channel);
}