tbf/test: Add test for DL LLC packet loss

Currently LLC frames are lost or even reordered when the TBF has be
established via the AGCH and the procedure fails for some reason.

This test tries to reproduce this behaviour by throwing away the
first TBF while calling the handle() method several times. The
results of create_dl_acked_block() are checked against expected
values (this is currently party disabled because the bug still
persists).

Ticket: #1759
Sponsored-by: On-Waves ehf

1 files changed, 60 insertions, 0 deletions

diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err
index 65387241..fe1b6adf 100644
--- a/tests/tbf/TbfTest.err
+++ b/tests/tbf/TbfTest.err
@@ -1108,6 +1108,66 @@ Searching for first unallocated TFI: TRX=0 first TS=4
 No TFI available.
 No PDCH resource
 BSSGP (BVCI=1234) Tx LLC-DISCARDED TLLI=0xc0000020, FRAMES=1, OCTETS=256
+Searching for first unallocated TFI: TRX=0 first TS=4
+ Found TFI=0.
+********** TBF starts here **********
+Allocating DL TBF: TFI=0 TRX=0 MS_CLASS=45
+Slot Allocation (Algorithm A) for class 45
+- Skipping TS 0, because not enabled
+- Skipping TS 1, because not enabled
+- Skipping TS 2, because not enabled
+- Skipping TS 3, because not enabled
+- Assign downlink TS=4
+- Setting Control TS 4
+Creating MS object, TLLI = 0x00000000
+The MS object cannot fully confirm an unexpected TLLI: 0xc0123456, partly confirmed
+Modifying MS object, TLLI = 0xc0123456, MS class 0 -> 45
+Attaching TBF to MS object, TLLI = 0xc0123456, TBF = TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL)
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL) [DOWNLINK] START
+Modifying MS object, TLLI = 0xc0123456, IMSI '' -> '001001000123456'
+Send dowlink assignment for TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL) on PCH, no TBF exist (IMSI=001001000123456)
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL) changes state from NULL to ASSIGN
+TX: START TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) Immediate Assignment Downlink (PCH)
+Sending data request: trx=0 ts=0 sapi=3 arfcn=0 fn=0 block=0 data=34 35 36 2d 06 3f 30 0c 00 00 7d 80 00 00 00 dc 01 23 45 68 00 23 2b 2b 2b 2b 
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) append
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) free
+Detaching TBF from MS object, TLLI = 0xc0123456, TBF = TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN)
+********** TBF ends here **********
+Searching for first unallocated TFI: TRX=0 first TS=4
+ Found TFI=0.
+********** TBF starts here **********
+Allocating DL TBF: TFI=0 TRX=0 MS_CLASS=45
+Slot Allocation (Algorithm A) for class 45
+- Skipping TS 0, because not enabled
+- Skipping TS 1, because not enabled
+- Skipping TS 2, because not enabled
+- Skipping TS 3, because not enabled
+- Assign downlink TS=4
+- Setting Control TS 4
+Attaching TBF to MS object, TLLI = 0xc0123456, TBF = TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL)
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL) [DOWNLINK] START
+Send dowlink assignment for TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL) on PCH, no TBF exist (IMSI=001001000123456)
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=NULL) changes state from NULL to ASSIGN
+TX: START TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) Immediate Assignment Downlink (PCH)
+Sending data request: trx=0 ts=0 sapi=3 arfcn=0 fn=0 block=0 data=34 35 36 2d 06 3f 30 0c 00 00 7d 80 00 00 00 dc 01 23 45 68 00 23 2b 2b 2b 2b 
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) downlink (V(A)==0 .. V(S)==0)
+- Sending new block at BSN 0, CS=1
+-- Chunk with length 19 is less than remaining space (20): add length header to to delimit LLC frame
+Complete DL frame for TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN)len=19
+- Dequeue next LLC for TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) (len=19)
+-- No space left, so we are done.
+data block: 07 00 00 4d 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 
+MSG = 07 00 00 4d 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) downlink (V(A)==0 .. V(S)==1)
+- Sending new block at BSN 1, CS=1
+-- Chunk with length 19 is less than remaining space (20): add length header to to delimit LLC frame
+Complete DL frame for TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN)len=19
+-- Final block, so we done.
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) changes state from ASSIGN to FINISHED
+data block: 07 01 02 4d 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 
+- Scheduling Ack/Nack polling, because is was requested explicitly (e.g. first final block sent).
+Polling cannot be sheduled in this TS 7, waiting for TS 4
+MSG = 07 01 02 4d 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 
 Searching for first unallocated TFI: TRX=0 first TS=7
  Found TFI=0.
 MS requests UL TBF on RACH, so we provide one: