This commit changes lots of stuff in the MS release lifecycle, but
there's no really good way to split this into patches which make sense,
since all the chaos is intensively entangled.
Get rid of the ms_callback complex mess, it is not needed at all.
Previous MS release was strange due to the existance of previous
ms_callback.idle concept and MS storage: the MS signalled when it went
idle (no TBFs attached) and waited for somebody outside to free it,
while then arming itself the release timer to release itself if it was
not released by whoever.
The new lifecycle follows an easier (expected) approach: Whenever all
TBFs become detached from the MS and it becomes idle (use_count becomes
0), then it frees its reserved resources (TFI, etc.) and either:
* frees itself immediatelly under certain conditions (release timeout
configured = 0 or MS garbage with TLLI=GSM_RESERVED_TMSI)
* Arms release_timer and frees itself when it triggers.
If during release_timer the MS is required again (for instance because a
new TBF with TLLI/IMSI of the MS is observed), then a TBF is attached to
the MS and it is considered to become active again, hence the release_timer
is stopped.
OS#6002
Change-Id: Ibe5115bc15bb4d76026918adc1be79469c2f4839
It is interesting to log that a tbf is being detached *before* it
actually happens, so that the reader can see which TBF is being
detached.
Change-Id: I2008beb9ab8f97f7ea5ed7b45cfb3f23dfe7b27f
Inside osmo-pcu code, the code path is to always call ms_alloc with
tlli=GSM_RESERVED_TMSI; a different value is only passed during unit
tests.
It makes no sense to have unit tests using differnet code paths than
ther app itself, since in the app it always desired to go through the
ms_set_tlli() and ms_confirm_tlli() which does more stuff.
Hence, drop the tlli param in ms_alloc and change the unit tests to use
the available APIs used by the application.
Change-Id: I730ec911a43b0f4e78faee4eeffb3ca8601564f8
This check (tlli != 0) was added in 2015 in
6d86628e5b, with the rationale below:
"""
To avoid dangling entries without a TLLI there (which cannnot be
retrieved anyway), the timer in the MS objects is not started after
all TBF have been detached, so that they get deleted immediately in
that case.
"""
The rationale makes sense, but through time the MS class was fixed to
return GSM_RESERVED_TMSI (0xFFFFFFFF) when no TMSI was available.
Hence, the check was wrong, and as a result, free() of MS containing
GSM_RESERVED_TMSI would be delayed over time by release timer.
Related: OS#6002
Change-Id: I7a694a30f8709c00af774846d7c4925cef253a71
Use same formatting similar to what's now used in TBF, which is far more
easy to grep and follow. This way one can easily follow what happens to
a given IMSI, a give TFI, a given TLLI, etc.
Change-Id: If9b325764c8fd540d60b6419f32223fd7f5a5898
use a format in tbf::name() which is sanitized (osmo_sanitize) and hence
can be used both in regular log as well as for its internal FSM ids.
Until now, the FSMs contained a small amount of information with
different formatting than the regular LOGPTFB(), which made it difficult
to grep or follow a TBF through its lifetime looking at logs. The new
unified format makes that a lot easier.
Extra information is now printed if available, such as IMSI.
Furthermore, the TFI is updated to include BTS and TRX, since the TFI is
unique within the scope of a TRX.
Change-Id: I3ce1f53942a2f881d0adadd6e5643f5cdf6e31da
Log before the action is done ("Detaching", not "Detached"). This way,
if something crashes we see that last line.
Change-Id: I6811d3772e2ac850741d3db5ec32be5c0812e81a
This helps distinguishing the case where a TBF is in the initial state
and the unexpected case where osmo_fsm_inst_state_name reports "NULL"
due to fi pointer being NULL.
Change-Id: Ieaabfc9fa0dedb299bcf4541783cf80e366a88c3
We are freeing the object immediately afterwards anyway, so no need to
pretend it went through the normal state release.
Leaving current state as it is actually provides more information on
what was the status/state at the time the TBF had to be freed.
Change-Id: I3016caaccc2c43e1e300f3c6042d69f8adcd9d69
As we integrate osmo-pcu more and more with libosmocore features, it
becomes really hard to use them since libosmocore relies heavily on C
specific compilation features, which are not available in old C++
compilers (such as designated initializers for complex types in FSMs).
GprsMs is right now a quite simple object since initial design of
osmo-pcu made it optional and most of the logic was placed and stored
duplicated in TBF objects. However, that's changing as we introduce more
features, with the GprsMS class getting more weight. Hence, let's move
it now to be a C struct in order to be able to easily use libosmocore
features there, such as FSMs.
Some helper classes which GprsMs uses are also mostly move to C since
they are mostly structs with methods, so there's no point in having
duplicated APIs for C++ and C for such simple cases.
For some more complex classes, like (ul_,dl_)tbf, C API bindings are
added where needed so that GprsMs can use functionalitites from that
class. Most of those APIs can be kept afterwards and drop the C++ ones
since they provide no benefit in general.
Change-Id: I0b50e3367aaad9dcada76da97b438e452c8b230c
The assumption that TLLI 0x00000000 is invalid and can be used
as the initializer is wrong. Similar to TMSI, 0x00000000 is a
perfectly valid value, while 0xffffffff is reserved - use it.
According to 3GPP TS 23.003, section 2.4, a TMSI/P-TMSI with
all 32 bits equal to 1 is special and shall not be allocated by
the network. The reason is that it must be stored on the SIM,
where 'ff'O represents the erased state. According to section
2.6 of the same document, a local/foreign TLLI is derived from
P-TMSI, so the same rule applies to TLLI.
I manually checked and corrected all occurances of 'tlli' in the
code. The test expectations have been adjusted with this command:
$ find tests/ -name "*.err" | xargs sed -i "s/0x00000000/0xffffffff/g"
so there should be no behavior change. The only exception is
the 'TypesTest', where TLLI 0xffffffff is being encoded and
expected in the hexdump, so I regenerated the test output.
Change-Id: Ie89fab75ecc1d8b5e238d3ff214ea7ac830b68b5
Related: OS#4844
Some tests were wrong (TypesTest) and required modification, since they
were setting a EGPRS MS but then expecting a GPRS assignment.
Change-Id: I9d3ee21c765054a36bd22352e48bde5ffca9225a
Receive an Application Information Request from the BTS via PCU
interface. Construct a Packet Application Information message from it
(3GPP TS 44.060 11.2.47) and send it to all MS with active TBF.
The TTCN-3 test infrastructure to test this feature is not quite ready
yet, so I've added C unit tests instead.
Related: OS#4048
Change-Id: Ie35959f833f46bde5f2126314b6f96763f863b36
Pau Espin
Pau Espin Pedrol
Vadim Yanitskiy
Oliver Smith