The UE stores PDCCH search spaces from the network in NR_BWP_PDCCH_t
struct within NR_UE_MAC_INST_t. After storing, the pointers otherSI_SS,
ra_SS and paging_SS are updated to point to the stored SS. Multiple
pointers could point to the same stored SS struct depending on
configuration. Then when the UE wants to release the SS, the pointers
are used to free the stored SS using ASN_STRUCT_RESET(). If multiple
pointers point to the same SS, calling ASN_STRUCT_RESET() on all
pointers would lead to double free. So one needs to check for dangling
pointer before freeing.
Instead of using pointers and assigning them during configuration, we
use SS id for otherSI_SS, ra_SS and paging_SS to retrieve the pointers
whenever needed. When the UE wants to release the SS, we make them -1
indicating an invalid SS id.
Add Bearer Context Modification Request/Response enc/dec lib and adopt in stack
This MR is introducing the Bearer Context Modification Response enc/dec
library with relative unit test, and it is also adopting it in the
stack. Also:
- Refactor Security Information IE decoding function
- Adopt Bearer Context Modification Request lib in stack (introduced in
!3219 (merged))
small bugfix for T tracer
small bugfix: missing beam index when addressing txdataF in T tracer
command. Also changed order of if(gNB->phase_comp) so that data is
exported in any case.
Issue 947 and compilation improvements
This MR started with a small commit (03c7f151) to close#947. Little did
I know that I would be taken in a long journey through OAI compilation
hell.
F1AP: Allocate gNB_DU_ID before storing ID
Update the test so it would catch that bug. Check in eq_() that both
gNB_DU_IDs would be present, or not, using xor.
Found while interop testing with OSC DU.
Fix all direct MAC memory leaks
This MR fixes many memory leaks in the MAC that are otherwise shown by
asan if the gNB is started. UEs can be connected and it seems the MAC
does not leak memory. It also fixes a number of memory problems where
e.g., the generation of SIB1 "steals" memory from the
ServingCellConfigCommon. See the commits for more details.
Note that this still leaves behind a lot of memory after calling the new
function mac_top_destroy_gNB(). To see them, add free(mac); in that
function. However, there are no "direct leaks", so it would be feasible
to still clean up (it's just that we don't do it, yet).
I checked. In a "standard" configuration (FR1, 30kHz), the memory leaks
come basically from RRC. Also, the F1 UE context setup message leaks
some memory, which we will handle in the future by adding
encoding/decoding functions that with corresponding utility (free, copy)
functions. On the other hand, the frequent F1 messages (UL/DL RRC
Message Transfer) do not leak memory (they have the utility functions).
A final commit just makes the inability to write nrRRC_stats.log,
nrL1_stats.log, and nrMAC_stats.log, non-fatal to the gNB.
Pass a "type" of RLC operational mode, from which split-type/gNB/UE
decision is derived.
Co-authored-by: Robert Schmidt <robert.schmidt@openairinterface.org>
prepare_scd() sets up memory for possible dedicated BWPs to be set up.
If they are not used, they are freed in fix_scd(). [1]
There are two problems:
1. in prepare_scd(), multiple structures are allocated once (for
multiple elements), but inserted once. When trying to free those, the
logic of ASN.1 is to free list elements individually, but then we try
to call free() on each element of the list that has been allocated in
one go. Fix this by doing multiple allocations to be in line with
ASN.1 logic.
2. in fix_scd(), free recursively all data structures, not only the
sequence element itself.
[1] this is horrible. We should only allocate memory if we actually need
it, but let's fix the more urgent problem of memory leaks first. Fixing
the logic problem would be more involved.
Laurent THOMAS