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BSC_Tests: Add TC_chan_exhaustion to test for channel exhaustion 

We ensure that all channels are allocated, and that the first allocation
beyond the avialable channels will fail and generate an IMM_ASS_REJ.

WE also verify that the related counters are incremented as expected.

Change-Id: Iade77321588190cec89cfcd9c18d84a7144e0198
This commit is contained in:
Harald Welte 2017-12-14 17:50:30 +01:00
parent 618ef64574
commit b5182047e6
1 changed files with 48 additions and 0 deletions
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48
bsc/BSC_Tests.ttcn
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@ -331,6 +331,53 @@ testcase TC_chan_act_nack() runs on test_CT {
setverdict(pass);
}
/* Test for channel exhaustion due to RACH overload */
testcase TC_chan_exhaustion() runs on test_CT {
var ASP_RSL_Unitdata rsl_ud;
var integer i;
var integer chreq_total, chreq_nochan;
f_init();
f_bssap_reset();
chreq_total := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total");
chreq_nochan := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel");
/* expect 5xTCH/F to succeed */
for (i := 0; i < NUM_TCHF_PER_BTS; i := i+1) {
f_chreq_act_ack('23'O, i);
}
IPA_RSL[0].clear;
f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total", chreq_total+NUM_TCHF_PER_BTS);
/* now expect additional channel activations to fail */
f_ipa_tx(0, ts_RSL_CHAN_RQD('42'O, 42));
alt {
[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV))) {
setverdict(fail, "Received CHAN ACT ACK without resources?!?");
}
[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_IMM_ASSIGN(?))) -> value rsl_ud {
var GsmRrMessage rr;
/* match on IMM ASS REJ */
rr := dec_GsmRrMessage(rsl_ud.rsl.ies[1].body.full_imm_ass_info.payload);
if (rr.header.message_type == IMMEDIATE_ASSIGNMENT_REJECT) {
f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total",
chreq_total+NUM_TCHF_PER_BTS+1);
f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel",
chreq_nochan+1);
setverdict(pass);
} else {
repeat;
}
}
[] IPA_RSL[0].receive { repeat; }
}
}
type record DchanTuple {
integer sccp_conn_id,
@ -1012,6 +1059,7 @@ control {
execute( TC_chan_act_ack_est_ind_noreply() );
execute( TC_chan_act_ack_est_ind_refused() );
execute( TC_chan_act_nack() );
execute( TC_chan_exhaustion() );
execute( TC_chan_rel_rll_rel_ind() );
execute( TC_chan_rel_conn_fail() );
execute( TC_chan_rel_hard_clear() );