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Add LAPDm collision test (contention resolution on network side)

This commit is contained in:
Andreas Eversberg 2013-02-06 14:13:21 +01:00 committed by Harald Welte
parent 8d50600d7d
commit a3de4dfb5c
1 changed files with 69 additions and 0 deletions
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69
tests/lapd/lapd_test.c
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@ -179,6 +179,32 @@ static int send_sabm(struct lapdm_channel *chan, int second_ms)
return 0;
}
static int send_sabm(struct lapdm_channel *chan, int second_ms)
{
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, 23);
msg->l2h[0] = 0x01;
msg->l2h[1] = 0x3f;
msg->l2h[2] = 0x01 | (sizeof(cm) << 2);
memcpy(msg->l2h + 3, cm_padded, sizeof(cm_padded));
msg->l2h[3] += second_ms; /* alter message, for second mobile */
/* 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...
*/
@ -417,6 +443,49 @@ static void test_lapdm_contention_resolution()
lapdm_channel_exit(&bts_to_ms_channel);
}
static void test_lapdm_contention_resolution()
{
printf("I test contention resultion by having two mobiles collide and "
"first mobile repeating SABM.\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;
memset(&bts_to_ms_channel, 0, sizeof(bts_to_ms_channel));
memset(&test_state, 0, sizeof(test_state));
test_state.bts = &bts_to_ms_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);
/* Send SABM MS 1, we must get UA */
send_sabm(&bts_to_ms_channel, 0);
rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
CHECK_RC(rc);
ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);
/* Send SABM MS 2, we must get nothing, due to collision */
send_sabm(&bts_to_ms_channel, 1);
rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
ASSERT(rc == -ENODEV);
/* Send SABM MS 1 again, we must get UA gain */
send_sabm(&bts_to_ms_channel, 0);
rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
CHECK_RC(rc);
ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);
/* clean up */
lapdm_channel_exit(&bts_to_ms_channel);
}
int main(int argc, char **argv)
{
osmo_init_logging(&info);