fixeria has submitted this change. (
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/27499 )
Change subject: BTS_Tests: add a hierarchy of L1CTL/LAPDm/DCCH altsteps
......................................................................
BTS_Tests: add a hierarchy of L1CTL/LAPDm/DCCH altsteps
In TTCN-3 it's possible to call one altstep from another. This
allows us to build complex hierarchies of simple altsteps, where
one is built on top of the others. I call this altstep-oriented
programming. This change adds the following hierarchy:
* as_l1ctl_dl_msg() - triggers on receipt of a L1CTL DATA.ind
matching the given RSL chan_nr/link_id and data templates;
* as_dl_lapdm_dummy() - triggers on receipt of dummy LAPDm
func=UI frames with empty payload (repeats by default);
* as_dl_dcch_lapdm_ab() - triggers on receipt of a Downlink DCCH
containing a L2 payload that matches the given LAPDm frame;
* as_dl_dcch_pdu() - triggers on receipt of a LAPDm AB frame
with a L3 payload matching the given template.
All of these altsteps (except as_dl_lapdm_dummy()) expect an 'out'
parameter, which will hold the matched (and possibly decoded) data.
Example:
var PDU_ML3_NW_MS pdu;
alt {
[] as_dl_lapdm_dummy(); /* Ignore empty LAPDm func=UI frames */
[] as_dl_dcch_pdu(pdu, tr_CM_SERV_ACC) { setverdict(pass); }
[] as_dl_dcch_pdu(pdu, tr_CM_SERV_REJ) { setverdict(fail); }
[] as_dl_dcch_pdu(pdu, ?) { setverdict(inconc, "Unexpected PDU"); }
}
Change-Id: Ia4d502488cbb6bccc4d2656206ae6649bfa71007
Related: SYS#5838
---
M bts/BTS_Tests.ttcn
1 file changed, 56 insertions(+), 0 deletions(-)
Approvals:
laforge: Looks good to me, but someone else must approve
pespin: Looks good to me, approved
Jenkins Builder: Verified
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index b95648a..39dca7a 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -873,6 +873,62 @@
}
}
+/* This altstep triggers on receipt of a L1CTL DATA.ind matching the given
+ * RSL chan_nr/link_id and data templates. Used as a base for other altsteps.
*/
+private altstep as_l1ctl_dl_msg(out L1ctlDlMessage msg,
+ template (present) octetstring tr_data := ?,
+ template (present) RslChannelNr chan_nr := ?,
+ template (present) RslLinkId link_id := ?)
+runs on ConnHdlr {
+ [] L1CTL.receive(tr_L1CTL_DATA_IND(chan_nr, link_id, tr_data)) -> value
msg;
+}
+
+/* This altstep is built on top of as_l1ctl_dl_msg(), and triggers on receipt
+ * of dummy LAPDm func=UI frames with empty payload. Repeats by default. */
+private altstep as_dl_lapdm_dummy(template (present) RslChannelNr chan_nr := ?,
+ template (present) RslLinkId link_id := ?,
+ template (present) LapdmSapi sapi := ?,
+ boolean do_repeat := true)
+runs on ConnHdlr {
+ template (present) LapdmFrame tr_frame := tr_LAPDm_UI(sapi, true, ''O);
+ var L1ctlDlMessage dl_msg;
+
+ [] as_l1ctl_dl_msg(dl_msg, decmatch tr_frame, chan_nr, link_id) {
+ if (do_repeat) {
+ repeat;
+ }
+ }
+}
+
+/* This altstep triggers on receipt of a Downlink DCCH containing a L2 payload
+ * that matches the given LAPDm frame. The L2 is treated as LapdmFrameAB. */
+private altstep as_dl_dcch_lapdm_ab(out LapdmFrameAB frame,
+ template (present) LapdmFrameAB tr_frame :=
?,
+ template (present) RslLinkId link_id := ?)
+runs on ConnHdlr {
+ var L1ctlDlMessage dl_msg;
+
+ [] as_l1ctl_dl_msg(dl_msg, decmatch tr_frame, g_chan_nr, link_id) {
+ frame := dec_LapdmFrameAB(dl_msg.payload.data_ind.payload);
+ }
+}
+
+/* This altstep is built on top of as_dl_dcch_lapdm_ab(), and triggers on
receipt
+ * of a LAPDm AB frame with a L3 payload matching the given template. The L3
+ * payload is treated as PDU_ML3_NW_MS. */
+private altstep as_dl_dcch_pdu(out PDU_ML3_NW_MS pdu,
+ template (present) PDU_ML3_NW_MS tr_pdu := ?,
+ template (present) GsmSapi sapi := 0)
+runs on ConnHdlr {
+ template (present) LapdmFrame tr_frame := tr_LAPDm_UI(sapi, true,
decmatch tr_pdu);
+ template (present) RslLinkId link_id := tr_RslLinkID_DCCH(sapi);
+ var LapdmFrameAB lapdm_frame;
+
+ [] as_dl_dcch_lapdm_ab(lapdm_frame, tr_frame.ab, link_id) {
+ pdu := dec_PDU_ML3_NW_MS(lapdm_frame.payload);
+ }
+}
+
/***********************************************************************
* Channel Activation / Deactivation
***********************************************************************/
--
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Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: Ia4d502488cbb6bccc4d2656206ae6649bfa71007
Gerrit-Change-Number: 27499
Gerrit-PatchSet: 2
Gerrit-Owner: fixeria <[email protected]>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <[email protected]>
Gerrit-Reviewer: laforge <[email protected]>
Gerrit-Reviewer: pespin <[email protected]>
Gerrit-MessageType: merged
