NS_Emulation: Introduce Load Sharing Function
The Load Sharing Function distributes traffic among all unblocked NS-VC
within a NS-VCG. The sharing is done based on a LSP (Link Selector
Parameter) which is passed with the NS-UNITDATA.req primitive from BSSGP
to NS. Details are implementation specific, but NS must ensure that all
traffic of one LSP is always sent through the same NS-VC, as long as
that NS-VC is alive/unblocked.
We use the LSP as follows:
* Signaling BVC always only uses lsp 0
* PTP BVC messages unrelated to user straffic use a per-BVC static LSP,
which is the BVCI
* User traffic can set whatever LSP it wants
* NS keeps an array of NSVCs currently unblocked and uses the LSP modulo
the array size as an index into it
Change-Id: I8b960ec4d729f50cadca353bb52685311cd45eed
Related: SYS#5084
diff --git a/library/BSSGP_Emulation.ttcnpp b/library/BSSGP_Emulation.ttcnpp
index 1370958..cb0c82c 100644
--- a/library/BSSGP_Emulation.ttcnpp
+++ b/library/BSSGP_Emulation.ttcnpp
@@ -274,14 +274,14 @@
/* Respond to RESET for signalling BVCI 0 */
[] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, omit), 0)) -> value udi {
log("Rx BVC-RESET for Signaling BVCI=0");
- BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0));
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0, 0));
f_sign_change_state(BVC_S_UNBLOCKED);
}
/* work-around for old, buggy libosmogb before Change-Id Ie87820537d6d616da4fd4bbf73eab06e28fda5e1 */
[mp_tolerate_bvc_reset_cellid] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, g_cfg.bvc[0].cell_id), 0)) -> value udi {
log("Rx BVC-RESET for Signaling BVCI=0");
- BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0));
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0, 0));
f_sign_change_state(BVC_S_UNBLOCKED);
}
}
@@ -301,7 +301,7 @@
BVC.send(udi) to bvc_comp_ref;
} else {
setverdict(fail, "Rx BSSGP for unknown PTP BVCI ", udi.bvci, ": ", udi.bssgp);
- BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), udi.bvci));
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), udi.bvci, 0));
}
}
@@ -324,7 +324,7 @@
BVC.send(udi) to bvc_comp_ref;
} else {
setverdict(fail, "Rx SIG BSSGP for unknown PTP BVCI ", ptp_bvci, ": ", udi.bssgp);
- BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0, 0));
}
}
}
@@ -362,7 +362,7 @@
[] BSCP.receive(NsStatusIndication:{g_cfg.nsei,?, complement (NSVC_S_ALIVE_UNBLOCKED), NSVC_S_ALIVE_UNBLOCKED, true}) -> value nsi {
/* if we just became NS-unblocked, send a BCC-RESET */
if (g_cfg.sgsn_role == false) {
- BSCP.send(f_BnsUdReq(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, 0, omit), 0));
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, 0, omit), 0, 0));
g_T2.start;
/* The BVC_RESET_ACK is handled in the as_sig_allstate() below */
}
@@ -383,7 +383,7 @@
/* Respond to RESET for signalling BVCI 0 */
[] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, omit), 0)) -> value udi {
log("Rx BVC-RESET for Signaling BVCI=0");
- BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0));
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0, 0));
for (var integer i := 0; i < sizeof(BvcTable); i := i+1) {
if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
BVC.send(BssgpResetIndication:{0}) to BvcTable[i].comp_ref;
@@ -408,14 +408,14 @@
/* Respond to BLOCK for wrong BVCI */
[] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK(?, ?), 0)) -> value udi {
setverdict(fail, "Rx BVC-BLOCK for unknown BVCI");
- BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(0, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(0, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0, 0));
}
/* Respond to RESET with wrong BVCI */
[] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, ?, ?), 0)) -> value udi {
var BssgpBvci ptp_bvci := oct2int(udi.bssgp.pDU_BSSGP_BVC_RESET.bVCI.unstructured_value);
setverdict(fail, "Rx BVC-RESET for unknown BVCI ", ptp_bvci);
- BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(ptp_bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(ptp_bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0, 0));
}
/* BVC-RESET-ACK for BVCI=0 while T2 is running: Answer to a BVC-RESET we sent earlier */
@@ -431,14 +431,14 @@
}
[] g_T2.timeout {
setverdict(fail, "Timeout waiting for BVC-RESET-ACK on BVCI=0");
- BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0, 0));
g_T2.start;
}
/* default case of handling unknown PDUs */
[] BSCP.receive(f_BnsUdInd(?, ?)) -> value udi {
setverdict(fail, "Rx Unexpected BSSGP PDU ", udi.bssgp," in state ", g_sign_bvc_state);
- BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(0, BSSGP_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, udi.bssgp), 0));
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(0, BSSGP_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, udi.bssgp), 0, 0));
}
/* Forwarding of ASP_Event to per-BVC components */
@@ -531,11 +531,12 @@
}
/* generate a send template. Cannot be a real template as we want to use g_cfg.nsei */
-private function f_BnsUdReq(template PDU_BSSGP pdu, BssgpBvci bvci)
+private function f_BnsUdReq(template PDU_BSSGP pdu, BssgpBvci bvci, integer lsp)
runs on BSSGP_CT return NsUnitdataRequest {
var NsUnitdataRequest udr := {
bvci := bvci,
nsei := g_cfg.nsei,
+ lsp := lsp,
/* for some weird reason we get "Dynamic test case error: Text encoder: Encoding an
* unbound integer value." when trying to send the reocrd rather than the octetstring */
//sdu := omit,
@@ -610,6 +611,9 @@
var BssgpBvcConfig g_cfg;
var boolean g_sgsn_role;
+ /* default Link Selector Parameter for this BVC (for traffic unrelated to a TLLI) */
+ var integer g_bvc_lsp;
+
var BvcState g_ptp_bvc_state := BVC_S_BLOCKED;
timer g_T1 := 15.0;
timer g_T2 := 60.0;
@@ -871,20 +875,20 @@
}
private function f_ptp_sendUnblock() runs on BSSGP_BVC_CT {
- BVC.send(ts_ptp_BnsUdReq(t_BVC_UNBLOCK(g_cfg.bvci), 0));
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_UNBLOCK(g_cfg.bvci), 0, g_bvc_lsp));
g_t1_waits_for_block_ack := false;
g_T1.start;
}
private function f_ptp_sendBlock(BssgpCause cause) runs on BSSGP_BVC_CT {
- BVC.send(ts_ptp_BnsUdReq(t_BVC_BLOCK(g_cfg.bvci, cause), 0));
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_BLOCK(g_cfg.bvci, cause), 0, g_bvc_lsp));
g_t1_waits_for_block_ack := true;
g_T1.start;
}
private function f_ptp_sendStatus(BssgpCause cause, PDU_BSSGP pdu) runs on BSSGP_BVC_CT {
/* FIXME: Make sure correct Signaling or PTP BVCI is used! */
- BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_STATUS(g_cfg.bvci, cause, pdu), g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_STATUS(g_cfg.bvci, cause, pdu), g_cfg.bvci, g_bvc_lsp));
}
private function f_ptp_sendReset() runs on BSSGP_BVC_CT {
@@ -900,7 +904,7 @@
}
/* BVC-RESET is always sent via the SIGNALLING BVCI, see Table 5.4.1 */
- BVC.send(ts_ptp_BnsUdReq(pdu, 0));
+ BVC.send(ts_ptp_BnsUdReq(pdu, 0, g_bvc_lsp));
g_T2.start;
//f_change_state(BVC_S_WAIT_RESET);
}
@@ -946,11 +950,11 @@
/* bogus unblock, just respond with ACK */
[] BVC.receive(tr_ptp_BnsUdInd(t_BVC_UNBLOCK(g_cfg.bvci), 0)) -> value udi {
- BVC.send(ts_ptp_BnsUdReq(t_BVC_UNBLOCK_ACK(g_cfg.bvci), 0));
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_UNBLOCK_ACK(g_cfg.bvci), 0, g_bvc_lsp));
}
/* Respond to BLOCK with BLOCK-ACK + change state */
[] BVC.receive(tr_ptp_BnsUdInd(t_BVC_BLOCK(g_cfg.bvci, ?), 0)) -> value udi {
- BVC.send(ts_ptp_BnsUdReq(t_BVC_BLOCK_ACK(g_cfg.bvci), 0));
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_BLOCK_ACK(g_cfg.bvci), 0, g_bvc_lsp));
g_T1.stop;
f_ptp_change_state(BVC_S_BLOCKED);
}
@@ -970,7 +974,7 @@
/* simply acknowledge all per-BVC Flow Control Messages */
[g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_FC_BVC, g_cfg.bvci)) -> value udi {
var OCT1 tag := udi.bssgp.pDU_BSSGP_FLOW_CONTROL_BVC.tag.unstructured_Value;
- BVC.send(ts_ptp_BnsUdReq(t_BVC_FC_BVC_ACK(tag), g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_FC_BVC_ACK(tag), g_cfg.bvci, g_bvc_lsp));
}
/*
[g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(t_BVC_FC_MS, g_cfg.bvci)) {
@@ -1017,44 +1021,48 @@
/* ConnHdlr sends BSSGP on BVCI=0 port: forward it to BSSGP_CT */
[] BSSGP_SP_SIG.receive(PDU_BSSGP:?)-> value bs_pdu sender vc_conn {
- BVC.send(ts_ptp_BnsUdReq(bs_pdu, 0));
+ BVC.send(ts_ptp_BnsUdReq(bs_pdu, 0, g_bvc_lsp));
}
/* ConnHdlr sends BSSGP on BVCI=PTP port: forward it to BSSGP_CT */
[] BSSGP_SP.receive(PDU_BSSGP:?)-> value bs_pdu sender vc_conn {
- BVC.send(ts_ptp_BnsUdReq(bs_pdu, g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(bs_pdu, g_cfg.bvci, g_bvc_lsp));
}
#ifdef BSSGP_EM_L3
/* ConnHdlr sends L3: Encode and send as UL_UD / DL_UD */
[g_sgsn_role] BSSGP_SP.receive(PDU_L3_SGSN_MS:?) -> value l3_mt sender vc_conn {
var integer idx := f_tbl_idx_by_comp(vc_conn);
+ var OCT4 tlli := ClientTable[idx].tlli;
var octetstring l3_enc := enc_PDU_L3_SGSN_MS(l3_mt);
var BIT4 sapi := f_llc_sapi_by_l3_mt(l3_mt);
var integer n_u := f_llc_get_n_u_tx(ClientTable[idx].llc[bit2int(sapi)]);
var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '1'B, n_u)));
- BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, llc_enc), g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_DL_UD(tlli, llc_enc), g_cfg.bvci, oct2int(tlli)));
}
[not g_sgsn_role] BSSGP_SP.receive(PDU_L3_MS_SGSN:?) -> value l3_mo sender vc_conn {
var integer idx := f_tbl_idx_by_comp(vc_conn);
+ var OCT4 tlli := ClientTable[idx].tlli;
var octetstring l3_enc := enc_PDU_L3_MS_SGSN(l3_mo);
var BIT4 sapi := f_llc_sapi_by_l3_mo(l3_mo);
var integer n_u := f_llc_get_n_u_tx(ClientTable[idx].llc[bit2int(sapi)]);
var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '1'B, n_u)));
- BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, g_cfg.cell_id, llc_enc), g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_UL_UD(tlli, g_cfg.cell_id, llc_enc), g_cfg.bvci, oct2int(tlli)));
}
#endif
/* ConnHdlr sends raw LLC: Encode and send as UL_UD / DL_UD */
[not g_sgsn_role] BSSGP_SP.receive(PDU_LLC:?) -> value llc sender vc_conn {
var integer idx := f_tbl_idx_by_comp(vc_conn);
+ var OCT4 tlli := ClientTable[idx].tlli;
var octetstring llc_enc := enc_PDU_LLC(llc);
- BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, g_cfg.cell_id, llc_enc), g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_UL_UD(tlli, g_cfg.cell_id, llc_enc), g_cfg.bvci, oct2int(tlli)));
}
[g_sgsn_role] BSSGP_SP.receive(PDU_LLC:?) -> value llc sender vc_conn {
var integer idx := f_tbl_idx_by_comp(vc_conn);
+ var OCT4 tlli := ClientTable[idx].tlli;
var octetstring llc_enc := enc_PDU_LLC(llc);
- BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, llc_enc), g_cfg.bvci));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_DL_UD(tlli, llc_enc), g_cfg.bvci, oct2int(tlli)));
}
}
@@ -1081,7 +1089,7 @@
[g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_RESET(?, g_cfg.bvci, g_cfg.cell_id), 0)) -> value udi {
log("Rx BVC-RESET from BVCI=", g_cfg.bvci);
/* Respond to RESET with correct BVCI but without CellID */
- BVC.send(ts_ptp_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, omit), 0));
+ BVC.send(ts_ptp_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, omit), 0, g_bvc_lsp));
/* FIXME: reset all state? What about clients? */
f_ptp_change_state(BVC_S_UNBLOCKED);
}
@@ -1089,7 +1097,7 @@
[not g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_RESET(?, g_cfg.bvci, omit), 0)) -> value udi {
log("Rx BVC-RESET from BVCI=", g_cfg.bvci);
/* Respond to RESET with correct BVCI with CellID */
- BVC.send(ts_ptp_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, g_cfg.cell_id), 0));
+ BVC.send(ts_ptp_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, g_cfg.cell_id), 0, g_bvc_lsp));
/* FIXME: reset all state? What about clients? */
f_ptp_change_state(BVC_S_UNBLOCKED);
}
@@ -1138,13 +1146,16 @@
/* main function for per-BVC Component */
private function f_bssgp_bvc_main(BssgpBvcConfig cfg, boolean sgsn_role, charstring id) runs on BSSGP_BVC_CT {
g_cfg := cfg;
+ g_bvc_lsp := cfg.bvci;
g_sgsn_role := sgsn_role;
f_bssgp_bvc_ScanEvents();
}
-template (value) NsUnitdataRequest ts_ptp_BnsUdReq(template (value) PDU_BSSGP pdu, template (value) BssgpBvci bvci) := {
+template (value) NsUnitdataRequest ts_ptp_BnsUdReq(template (value) PDU_BSSGP pdu, template (value) BssgpBvci bvci,
+ template (value) integer lsp) := {
bvci := bvci,
nsei := 0, // overwritten in BSSGP_CT
+ lsp := lsp,
/* for some weird reason we get "Dynamic test case error: Text encoder: Encoding an
* unbound integer value." when trying to send the reocrd rather than the octetstring */
//sdu := omit,