this is a rather large commit that is hard to split because
it touches quite a few components.
It's a preparation patch for adding NR split bearers in the next
step.
We realized that managing RLC and PDCP bearers for both NR and LTE
in the same entity doesn't work. This is because we use the LCID
as a key for all accesses. With NR dual connectivity however we
can have the same LCID active at the same time for both LTE and NR
carriers.
The patch solves that by creating a dedicated NR instance for RLC/PDCP
in the stack. But then the question arises for UL traffic on, e.g. LCID 4
what PDCP instance the GW should use for pushing SDUs. It doesnt' know
that. And in fact it doesn't need to. It just needs to know EPS
bearer IDs. So the next change was to remove the knowledge of what
LCIDs are from the GW. Make is agnostic and only work on EPS bearer IDs.
The handling and mapping between EPS bearer IDs and LCIDs for LTE
or NR (mainly PDCP for pushing data) is done in the Stack because
it has access to both.
The NAS also has a EPS bearer map but only knows about default and
dedicated bearers. It doesn't know on which logical channels they
are transmitted.
- the consumer does multi-staged waiting:
1. spins first across all queues in a RR fashion
2. each queue access is done with a try_lock.
3. if the try_lock fails, it increases the number of spins needed
2. if no queue had data, the consumer sleeps for 100 usec.
- no differentiation between queues, in terms of notification features
With the new design, each queue created in the multiqueue object has its own mutex.
Pushing tasks to separate queues will, therefore, not cause contention.
There will be, however, still contention between the popping thread and the pushing threads.
* refactor some common methods to mac_common.cc
* add common mux_base class
* move UL PDU generation to mux class
* add logical channel registration to MAC, MUX, BSR
* add initial proc BSR
* add basic MAC NR test
* rework MAC interfaces
after adding the thread-safe PCAP writer functionality to the EUTRA
MAC object it became clear that we don't wont to replicate the
same for the NR object.
This patch therefore refactors the class that now supports both EUTRA and
NR rats. The old mac_nr_pcap.[h/cc] has been deleted. All test-cases
and usages now use the new object that needs to pass the RAT type in
the ctor.
this patch addresses the last open point of #2160
* Replaced UE logger in the ue class.
* Replaced loggers in the main phy class and prach.
* Replaced loggers in phy common and ta_control.
* Replace loggers in cc and sf workers.
* Replaced loggers in intra_measure, scell_recv, search, sfn_sync, sync.
* Remove last uses of the old loggers in the main phy class.
* Remove stray newline in logs.
* Replaced loggers in ue gw.
* - Started to replace loggers in the ue stack.
- Replaced loggers in usim and pcsc.
- Adapted nas and usim tests.
* Replace loggers in nas.
* Added missing log init calls in two previously modified tests.
* Replaced logger in nas idle procs.
* Replaced loggers in nas emm state.
* Replaced loggers in tft packet filter and adapted tft test.
* Replaced loggers in main RRC class.
* Replaced loggers in RRC cell.
* Replaced loggers in RRC meas.
* Replaced loggers in rrc procedures.
* Started logger replacement in MAC layer, more precisely in demux and dl_harq classes.
Been unable to inject loggers in construction for dl_tb_process due to very weird static assertions in the std::vector code being the type not constructible which is not true, so instead use the main MAC logger directly.
* Replaced loggers in mac mux class.
* Replaced loggers in mac pro_bsr.
* Replaced loggers in mac proc phr.
* Replaced loggers in mac proc SR and RA.
* Replace loggers in mac UL HARQ.
* Replaced loggers in main ue stack class.
* Fixed nas test crashing due to a null string.
* Ported mac_test to use the new loggers.
* Removed TTI reporting for the PHY log as the old logger did.
* Replaced loggers in UE phy tests.
* Configure loggers in nas_test.
* Replaced loggers in rrc_meas_test.
* Replaced loggers in rrc_reconfig_test.
* Added missing newline in tft_test.
* Fix compilation errors in TTCN3 tests.
* Fix linker error detected in CI and warning.
* Replaced loggers in TTCN3 tests.
* Fix a text replace error in some log messages.
* Remove trailing newlines from log entries.
* Remove old logger from rrc.
* Flush backend before printing the test status.
* - Fix compilation error from previous rebase.
- Remove trailing newlines from some missing log entries.
when retrieving the RLC metrics, the number of TTIs since the last
call are passed. This allows to calculate the actual rate
based on the LTE timing rather than only the system timing.
this patch refactors the SDU queuing and dropping policy of the RLC and PDCP layer.
the previous design had issues when packets have been generated at a higher
rate above the PDCP than they could be consumed below the RLC.
When the RLC SDU queues were full, we allowed two policies, one to block on the write
and the other to drop the SDU. Both options are not ideal because they either
lead to a blocking stack thread or to lost PDCP PDUs.
To avoid this, this patch makes the following changes:
* PDCP monitors RLC's SDU queue and drops packets on its north-bound SAP if queues are full
* a new method sdu_queue_is_full() has been added to the RLC interface for PDCP
* remove blocking write from pdcp and rlc write_sdu() interface
* all writes into queues need to be non-blocking
* if Tx queues are overflowing, SDUs are dropped above PDCP, not RLC
* log warning if RLC still needs to drop SDUs
* this case should be avoided with the monitoring mechanism
Francisco
Fabian Eckermann
Andre Puschmann
Xavier Arteaga
Codebot
David Rupprecht
faluco
faluco
Francisco Paisana