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This fixes TBF objects leaking and ending up alive when the MS object is
explicitly freed through talloc_free (and sporadically
crashing TbfTest once a timeout for them occur).
This mostly affects unit tests, where most of the explicit free()
happens.
In osmo-pcu, in general, the GprsMs object only gets _free() called when
its resource count reaches 0, aka no more TBFs are attached to it. Hence
in general GprsMs object is freed() only when no TBFs (to be leaked) are
present.
However, in the unit tests it's usual that we want to wipe the entire
context by eg. feeing the PCU, the BTS or MS object, which should also
free the related TBFs.
When running osmo-pcu this may only be an issue when the MS object is
freed explicitly, which could happen for instance when a BTS is torn down,
ie. PCUIF going down, moment at which all GprsMs of that BTS are freed.
But in there actually it iterates over PDCHs to free all TBFs, so it's
fine.
If we iterated over MS, this could have ended up in a crash, like
it happened in TbfTest sporadically, but it's not a bit problem if we
crash + restart at that time since anyway the BTS is gone ore just
getting up around that time.
Related: OS#6359
Change-Id: Ibbdec94acb8132be20508d3178d88da44bfaf91d
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Change format to print the state at the end, to resemble more the same
format used by FSMs.
Furthermore, by moving it at the end, print it only when "enclousure" is
requested, aka when not requested by FSM to update its internal name.
The consequence of this logc is that log lines printed from FSM don't
end up with the same state string printed twice in different places.
While at it, shorten the EGPRS/GPRS indicator to one character, which
should be understandable enough since it matches what's usually seen in
mobile phones to signal one or another.
Change-Id: I86b5f042fae77721b22fc026228677bd56768ba9
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Change-Id: Ie470b5b0c7b01d91f4ad693e52afd51860d6da2d
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Make the caller hold a reference to the MS object just allocated, so
that it hs to explicitly unref it and, in turn, if no new references
were added during its use, trigger release of the MS object.
This is useful to avoid leaking MS object if it was allocated and then
no TBF is attached to it because allocation of TBF failed.
Related: OS#6002
Change-Id: I2088a7ddd76fe9157b6626ef96ae4315e88779ea
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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
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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
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* Make sure that the tbf being attached has already the MS assigned.
* Check no re-attaching of alredy attached TBF ever happens.
* Document and early skip case where a non-attached TBF detach is
attempted.
* Avoid recursive call mess to tbf_set_ms(tbf, NULL); during detach.
* MsTest needs to be modified since it uses fake TBF objects which use
different set of calls than the regular TBFs in osmo-pcu. Since the
ul_tbf object is reused, it needs to be assigned ul_tbf->ms again before
re-assigning it, as per what happens usually in tbf_set_ms() in
osmo-pcu.
Change-Id: Ia18fe2de1fb3bf72f530157e5f30de64f2b11e12
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Change-Id: Ib65629224e6bd5683bb9192ba4354e965e8d39ec
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With this change the MS no longer is removed from the llist without
potentially skipping free() if not idle in bts_ms_idle_cb().
As a result, some unit tests now can free it during bts tear down
instead of having them leaked.
The tests int MsTest need changes because the tbfs created are fake and
cannot be freed using tbf_free(), and hence cannot be detached from MS
using regular code paths. Instead first call explicit talloc_free(ms)
like other unit tests in the file already do.
Change-Id: Id53f8dfb9963366dd4b19a324615bbc83c4f23e7
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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
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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
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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
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This allows distinguishing when a TBF didn't set the TFI. Useful to
identify dummy reject TBFs, etc, and make sure a non-dummy TBF set its
TFI properly.
Change-Id: Iecf54a24041bd14f4ef5b86e57c3732e1b69d463
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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
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Change-Id: If7f471f4932c2347cd857cd59f761a36d9e735d1
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Change-Id: Ieaea6ab07b4b2822bcf394f2d0e9298b9f3c5854
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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
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This is another step forward towards a more clear data model where a TBF
always has a MS object (which may be lacking some information, and at a
later point when more information is found, it may actually be a
duplicated MS object and hence one duplicate removed and the TBF moved
to the object being kept).
This helps for instance in removing duplicated information stored in
the TBF which is really per MS, like ms_class, ta, etc. Since there's
always a MS object there's no need to keep a duplicate in both classes
in case there's no MS object.
It can already be seen looking at unit test logging that this kind of
data model already provides better information.
Some unit test parts were needed to adapt to the new model too.
Change-Id: I3cdf4d53e222777d5a2bf4c5aad3a7414105f14c
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Right now set_mode() on GprsMs behaves in pretty counter-intuitive way:
* it's possible to set current DL MCS higher than max value
* EGPRS and EGPRS_GMSK have the same max DL MCS
* setting EGPRS* mode drops current/max MCS values to unknown
Let's capture this in a unit-test before attempting any further
modifications.
Change-Id: Ibf917f4b49d927a21cbd467775806fa6ea06a6a6
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Currently when calling GprsMs::attach_tbf and a TBF of the same
direction already exists, the old TBF gets detached from the MS
object.
Therefore that TBF object loses access to that MS object including
for instance TLLI and IMSI.
This leads to failing DL TBF reuses, since the downlink assigment
cannot be sent on the PACCH later on because that must be sent on the
old DL TBF which ms() is NULL and the new DL TBF cannot be retrieved.
This commit fixes this bug by changing the GprsMs implementation to
keep a list of replaced (old) TBFs. TBFs are only removed when they
are being detached explicitely (see tbf_free and set_ms).
Addresses:
tbf.cpp:741 We have a schedule for downlink assignment at uplink
TBF(TFI=1 TLLI=0xf35a680e DIR=UL STATE=RELEASING), but there is no
downlink TBF
Sponsored-by: On-Waves ehf
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If just a few bytes are left to send to the MS, it makes sense to
reduce the coding scheme level to increase the throughput. This
has been shown by Chen and Goodman in their paper "Theoretical
Analysis of GPRS Throughput and Delay". See their throughput over C/I
measurement graphs (figures 4 and 5 in the paper) for details.
This commit implements a simplified CS downgrade feature for the
downlink. The coding scheme will be downgraded if there are only a
few octets are left to be send over the TBF (see the
downgrade-threshold command below) and the NACK rate is not low (the
CS will not get degraded on a high quality RF link). As an exception,
CS-3 will be degraded to CS-1, since CS-2 does not improve the
throughput in general when a few small packets are sent and the
signal fades slowly (see Chen/Goodman).
The following VTY command is added to the config-pcu node:
- cs downgrade-threshold <1-10000>
- cs no downgrade-threshold
to set the threshold of the number of remaining bytes to be RLC/MAC
encoded. The CS will only be reduced, if the number is below the
threshold. The 'no' command disables this feature completely. The
default value is 200 octets.
Sponsored-by: On-Waves ehf
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Currently the MS object is immediately idle when all TBFs are
detached and if no guard is being used. Since the plan is to use the
MS objects to pass information from one TBF to the next one even
across the gap of some seconds of inactivity, a mechanism is needed
to keep the MS objects around for some time.
This commit extends the GprsMs class by a timer that keeps the MS
objects in non-idle state for some time after all TBFs have been
detached. The set_timeout method must be used with a non-zero value
to activate this feature.
Sponsored-by: On-Waves ehf
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This commit extends get_ms() to really compare the IMSI if it has
been given. Matching by TLLI has a higher precedence than matching by
IMSI.
Ticket: #1674
Sponsored-by: On-Waves ehf
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Currently the m_tlli member in GprsMs is set by the constructor,
circumventing the TLLI confirmation mechanism.
This commit replaces the get_or_create_ms() method by a create_ms()
method which takes the TLLI and the direction (UL or DL) as
parameters to select either set_tlli() or confirm_tlli(). The MS
object is instantiated with TLLI = 0, and therefore GprsMs::tlli() is
extended to return the DL TLLI if both of the other TLLI are not set.
Note that create_ms() will not check whether an MS object with a
matching TLLI is already stored in the list, so it should only be
called after a corresponding get_ms() in general.
Sponsored-by: On-Waves ehf
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According to the specification (GSM 04.08/24.008, 4.7.1.5) after a
new P-TMSI has been assigned, the old P-TMSI must be kept basically
until it has been used by both sides. Since the TLLI will be derived
from the P-TMSI, the old TLLI must also be kept until the new TLLI
has been used by both MS and SGSN.
This commit modifies the TLLI handling of GprsMs accordingly.
set_tlli() is only used with TLLIs derived from MS messages,
confirm_tlli() is used with TLLIs derived from messages received from
the SGSN. tlli() returns the value set by the MS. check_tlli()
matches each of the TLLI used by either MS or SGSN as well as the old
TLLI until it has been confirmed.
Sponsored-by: On-Waves ehf
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Currently the MS objects are contained in the TBF objects only. To
allow for an extended life time after the TBF objects have been freed
and to find them based on TLLI, a container for the MS objects is
needed.
This commit adds the container class and also adds the corresponding
m_list member to GprsMs. Further integration into the PCU code is not
yet done.
Ticket: #1674
Sponsored-by: On-Waves ehf
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Currently only TBF objects are used to handle the data flow between
the MS and the SGSN. MS specific data (e.g. pending LLC frames, TLLI)
is copied between successive TBFs. If all TBFs (uplink and downlink)
are idle for some time, all information about the MS is discarded in
the PCU. This makes the implementation of some features more
difficult, e.g. proper TLLI and timing advance handling,
connection based CS selection, and proper management of multiple TBF.
This commit adds the GprsMs class that is intended to hold
information directly related to the MS and to keep references to the
active TBFs.
The class is not yet integrated with the other PCU code. A GprsMs
object container and MS specific fields (TA, CS) will be added in
later commits.
Note that calling detach_tbf() can possibly delete the MS object
depending on the callback implementation.
Ticket: #1674
Sponsored-by: On-Waves ehf
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