[PATCH 0/3] openbsc: ctrl updates

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Daniel Willmann daniel at totalueberwachung.de
Sat Sep 10 15:14:58 UTC 2011


Hello Pablo,

sorry, but this is going to take me longer than I previously thought.
Just some short remarks on what I noticed so far. After Tuesday I'll
have more time on my hands to help with porting.

On Fri,  9 Sep 2011 03:05:26 +0200
pablo at gnumonks.org wrote:

> From: Pablo Neira Ayuso <pablo at gnumonks.org>
> 
> These patchset contains the port of libctrl to use the IPA
> infrastructure available in libosmo-abis.

> I've also made one small cleanup to bail out in case that
> we cannot bind to the telnet port. Another patch follows up
> to avoid disabling nagle (to avoid problems with TCP
> segmentation, we still have to support this appropriately),
> I noticed this while doing the port work.

First of all thanks for starting the port. I had a brief look into that
a week ago, but ran into different problems.

> Pablo Neira Ayuso (3):
>   ctrl: use generic IPA socket infrastructure available in
>     libosmo-abis

The control commands need to be sent both over the dedicated control
connection as well as between osmo-bsc and nat. It seems that the
bsc_msc_connection is still using osmo_wqueues which complicates
matters as I originally just used ctrl_cmd_send to send the response to
whatever osmo_wqueue the command came in from or forward commands from
the nat to the appropriate osmo-bsc.
bsc_nat also needs to know if a a control connection is closed so it
can remove any commands pending response from the pending list. The
list is needed to generate errors if the msc_bsc connection is reset or
a timeout occurs while a command is in transit. Could you add a
callback to ipa_server_conn that gets called if the connection is
closed?


>   src: check for error returned by controlif_setup()

That's certainly useful, thanks.

>   ctrl: do not disable nagle algorithm until we fully support
>     segmentation

I had a look at commit 4462f8 and I believe I just tried to mimic the
behavior of msc_connection_connected() from ./osmo-bsc/osmo_bsc_msc.c
at that time.

Anyway, I'd be interested in the problems you encountered. I know that
ipaccess_read_msg mishandled the case where the data read returned only
a partial packet, but shouldn't that only occur if the data to be sent
is larger than the current MSS? In any case I would have expected
disabling the nagle algorithm to help  in that regard...

So I guess there's still some work to do. I'll reserve some time on
Thursday to look at the issues.


Regards,
Daniel Willmann




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