Change in osmo-ggsn[master]: gtp: Rework parsing logic of UpdatePdpCtxResponse

[pespin]

Hello Jenkins Builder, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/osmo-ggsn/+/23860

to look at the new patch set (#2).

Change subject: gtp: Rework parsing logic of UpdatePdpCtxResponse
......................................................................

gtp: Rework parsing logic of UpdatePdpCtxResponse

The previous order of parsing lead to non-optimal information gathering
when pushing events to upper layers.

This patch rearranges parsing of packet data to always gather as much
info as possible for the benefit of the upper layer. This way it can
gather information such as the cause, which is important in the case of
"Non-existent", since user should then drop the context.

First we want to parse the recovery state, but delay cb to upper layers
until we tried to gather the pdp ctx (meaning all except that pdp ctx
should be freed).
Second, we want to parse the cause, in order to know if there's an
associated pdp ctx we can gather from TEID.
Third, once we know if we should expect a meaningul TEID, parse it.

Related: SYS#5435
Change-Id: Idd10b494e8fbac8703c49ecd8f9bbe4246e51c57
---
M gtp/gtp.c
1 file changed, 30 insertions(+), 19 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/60/23860/2
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Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Change-Id: Idd10b494e8fbac8703c49ecd8f9bbe4246e51c57
Gerrit-Change-Number: 23860
Gerrit-PatchSet: 2
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-MessageType: newpatchset
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