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56 Commits (202ec283ff77dee4998144754d99e96fc272df5d)

Author SHA1 Message Date
Andre Puschmann a7911f0dab pdcp,rlc: refactor SDU queueing policy 
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
 5 years ago
Francisco Paisana 1a9c04bf2f use of task scheduler handle in pdcp 5 years ago
Francisco Paisana 0259d31b13 fix lack of final in pdcp virtual methods 5 years ago
Francisco Paisana f0874b780b add radio_base/null classes 5 years ago
Pedro Alvarez 9c1a7d2cf1 Removed get_bearer_status in PDCP. Renamed get_state/set_state to 
get_bearer_state/set_bearer_state.
 5 years ago
Pedro Alvarez 66d4f320e5 Added intereface to set PDCP state after reestablishment. 5 years ago
Pedro Alvarez 33567d81db Added interface to get internal PDCP state. 5 years ago
Francisco Paisana c09f76ed6c unified stack task defer method 5 years ago
Andre Puschmann 9307a54512 pdcp: adding enable_security_timed() method 
this is an extension to the currently available security
configuration and activation methods provided by PDCP.
The new call allows to specify a Rx and Tx SN after which the
entire security config, i.e. integrity and ciphering, should
be enabled.

this is mainly required for the PDCP entity of the conformance
testing SS but could potentially also be used by the eNB
to enable security for PDCP after sending the SecModeCommand
for example.

the extra call was added to not break the existing API.
 5 years ago
Francisco Paisana 30ae2226c1 common interface for stack multiqueue tasks, background tasks and timers 5 years ago
Francisco Paisana 344eaf49ec use logmap in the whole enb and ue 5 years ago
Francisco Paisana 9bde6d442c removed the uneeded locks from the pdcp 5 years ago
Francisco Paisana f3890b2908 use of mutexed cache to store the valid lcids that can be checked from gw thread 5 years ago
Xavier Arteaga e832769ae6 Updated copyright 5 years ago
Pedro Alvarez 96c82b3fc6 Moved PDCP configs to pdcp_config.h. Added `as_security_cfg_t` structure to hold access stratum keys. 
Refactored PDCP, RRC and USIM accordingly.
 5 years ago
Andre Puschmann 9e113f8b27 pdcp: allow to configure security for rx/tx seperately 
previously PDCP security (integrity and ciphering) could only
be enabled for both Rx and Tx at the same time.

this, however, caused an issue during the conformance testing in which,
in TC_8_2_1_1() for example, the eNB sends a SecModeCommand and a
RRC Reconfiguration in the same MAC TB. In this case, the eNB
needs to be able to enable DL security right after sending the SecModeCmd
in order to send the RRCReconfig encrypted. However, enabling UL security needs
to be postponed until after the SecModeComplete is received.

This patch allows to enable PDCP security for rx/tx independently if
that is needed. The default way is like before, enabling it for tx/rx at
the same time.
 5 years ago
Andre Puschmann 6ec573987a remove default value for 'blocking' param from pdcp::write_sdu() 
there were two defaults and one was shadowing the other. This
commit removes both defaults and uses blocking-mode for RRC
calls to PDCP in the UE. The eNB write_sdu() uses the non-blocking
mode by default. We have to review the eNB's RRC perhaps and use blocking
there too and non-blocking only for data plane
 5 years ago
Francisco Paisana 6b4488d5c1 added sending of enb status transfer from SeNB 5 years ago
Pedro Alvarez 15613465cf Moving some initialization from init function to constructor in the PDCP entities. 5 years ago
Francisco Paisana c9d3b61038 added resumable procedures to make RRC and NAS non-blocking 5 years ago
Pedro Alvarez 6efa944b5e Removed srslte prefix from pdcp_config_t 5 years ago
Pedro Alvarez f90b69e5f4 More clang-format for PDCP 5 years ago
Pedro Alvarez 491695ab77 Clang-formated PDCP NR PR. 5 years ago
Pedro Alvarez 457f35699d Reverted back to a single config structure between PDCP NR and PDCP LTE. 5 years ago
Pedro Alvarez 1944bf9a80 Continue to split pdcp_entity_lte and pdcp_entity_nr. Compiling now. 5 years ago
Pedro Alvarez 005d03cb1a Starting to split pdcp_entity into pdcp_entity_lte and pdcp_entity_nr to support NR PDCP 5 years ago
Andre Puschmann 58763fb714 stack: move initialization of log object into ctor 
this fixes the issue when the stack is torn down if, for example,
the radio couldn't be loaded correctly. it will hence call stop() on all stack
components which are not initialzized yet, and logging therefore doesn't work.
the log object is know during contruction time and therefore can be passed
in as soon as possible.
 6 years ago
Andre Puschmann e0a28cf4c0 simplify PDCP init and also bypass it for SRB0 on eNB 6 years ago
Andre Puschmann 218f136254 remove default PDCP entity for SRB0 6 years ago
Ismael Gomez 14b526f2aa Add PDCP per-bearer reestablish 6 years ago
Francisco Paisana 3bedc93ba5 added _t to unique_byte_buffer type 6 years ago
Francisco Paisana f469e2178b replaced byte_buffer_t allocated by the buffer pool for unique_byte_buffer which is safer and easier to use 6 years ago
Francisco Paisana 0976ea6f27 created a unique byte buffer that automatically deallocates 6 years ago
Andre Puschmann 4b01a2e4a0 update copyright notice 6 years ago
David Rupprecht eb3a83ac45 User Plane key in configuration interface 6 years ago
Andre Puschmann 27459bf706 add API to change LCID of PDCP bearers 6 years ago
Andre Puschmann f56592b0fe add getter for PDCP ul/dl counter 6 years ago
Andre Puschmann 91492b87ef add del_bearer for RLC/PDCP 6 years ago
Andre Puschmann ee5b055829 rename pdcp function for GW to is_lcid_enabled() 7 years ago
Andre Puschmann b8438e9cc3 extend PDCP interface to allow non-blocking write of SDUs 7 years ago
Andre Puschmann 47a8b1343f add rwlock to PDCP 7 years ago
Andre Puschmann 93c11e4416 turn PDCP array into map 7 years ago
yagoda 49c3578f64 introducing embms support in common upper layer functions 7 years ago
David Rupprecht 9d71bec7b6 Unified include guards 7 years ago
Ismael Gomez 5c31800ccb Fixed HO with ciphering 7 years ago
Ismael Gomez 9a255b477a Merge branch 'crypto' into mobility_crypto 7 years ago
Paul Sutton 1a323770c9 Added support for AS ciphering 7 years ago
Paul Sutton 84724d2ab1 NAS-plane encryption working (thanks to David Rupprecht) 7 years ago
Ismael Gomez 408545dab8 X2 (constant NCC) working 7 years ago
Ismael Gomez 68b1782c86 Fixed Paging and reattachment in new state machine. Moved GW to srsue 7 years ago