The code is forced to use nea2, no matter what the UE supports.
After 2^18 PDCP packets, it will fail to work (we don't use HFN yet).
These limitations will be fixed in later commits.
The existing security function was not reused, because it does too
much memory allocation and initializes the security context at each
ciphering. So here comes nr_pdcp_security_nea2_cipher(). And also
the ciphering is done inplace. To be changed if necessary.
- enabled procedures that were already called for phy-test mode
- enabled setup of DRB for the current C-RNTI
- enhanced information, debugging and warning logging at MAC/RLC/PDCP level
There was a problem with SN size. It was hardcoded to 12 bits (so max
sn = 4095) but we configure the UE with 18 bits. After a while, iperf
didn't work anymore because of this (what a surprise!).
So let's get the correct value from pdcp_Config.
And while we're at it, let's store also discard_timer and t_reordering
that will be used later by a proper NR PDCP layer (which is currently
work in progress).
This commit introduces several enhancements in X2AP and RRC to deal
with ENDC. The main goal is to deal with UE's on/off and with various
errors.
The following work is included:
- DC prep and DC overall X2 timers
- X2 messages for UE release and DC timers' timeout
Open problems:
- what to do when the UE sends an scg Failure? This commit removes
the UE. And this removal may not be correctly done
- UE removal in the gNB's PHY layer (a next commit is coming,
but it is hackish and will need a rework)
Initially targeting ENDC setup with commercial UE
- Missing nr_rrc_pdcp and nr_rrc_rlc configuration wrt the established DRB
- Remaining to test with user plane data traffic (Downlink and Uplink)
Cedric Roux