Change in libosmocore[master]: ns2: Work around AF_PACKET socket ENOBUFS problems

[laforge]

Hello Jenkins Builder, lynxis lazus, daniel, 

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

    https://gerrit.osmocom.org/c/libosmocore/+/22555

to look at the new patch set (#3).

Change subject: ns2: Work around AF_PACKET socket ENOBUFS problems
......................................................................

ns2: Work around AF_PACKET socket ENOBUFS problems

AF_PACKET sockets cannot be written-to using select(), as they
will always return "writable" but then still fail with ENOBUFS.

This also means that we cannot use osmo_wqueue() as it assumes
that a writable socket can actually be written to.

As there's no way to figure out when exactly we can again perform
a successful write, we have no other option but to start a timer
and re-try at a later time.

We will scale that timer based on the estimated duration of transmission
for the just-failed PDU on the line rate of a 31TS E1 Line.

Furthermore, with this patch, we stop queueing anything but signaling
traffic (NS-BVCI=0) or Q.933 LMI.  User data (NS-BVCI != 0) will
instead be dropped in order to avoid buffer-bloat.

Change-Id: I4f79a246236c94175ceffa5f3f556c8931c6bc62
Closes: OS#4995
---
M src/gb/gprs_ns2_fr.c
1 file changed, 166 insertions(+), 25 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/55/22555/3
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I4f79a246236c94175ceffa5f3f556c8931c6bc62
Gerrit-Change-Number: 22555
Gerrit-PatchSet: 3
Gerrit-Owner: laforge <laforge at osmocom.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: daniel <daniel at totalueberwachung.de>
Gerrit-Reviewer: lynxis lazus <lynxis at fe80.eu>
Gerrit-MessageType: newpatchset
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