netdev - Re: How to use ixp4xx_hss (or generic-hdlc?)

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Message-ID: <m3bpw8smkh.fsf@maximus.localdomain>
Date:	Sat, 22 Nov 2008 00:09:50 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Miguel Ángel Álvarez <gotzoncabanes@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: How to use ixp4xx_hss (or generic-hdlc?)

"Miguel Ángel Álvarez" <gotzoncabanes@...il.com> writes:

> Is there any kind of tutorials on using generic-hdlc interfaces?

Not much, Documentation/networking/generic-hdlc.txt.

> I
> just want to make a simple point-to-point connection between two
> devices using ixp4xx_hss. I would like the data to be packetized using
> hdlc.
> -  I suppose I should use sethdlc to configure the interface, but I am
> not sure about the configuration except that I should set "hdlc"
> protocol (I hope).

Sure.

> - Then I should "open" the interface. I am trying with "ifconfig hdlc0
> up", but I obtain an "ifconfig: SIOCSIFFLAGS: Function not
> implemented". As my previous use of net devices has been using
> ethernet or wifi devices in an "IP world", I am not quite sure if
> ifconfig should be used in this case.

modprobe driver and maybe hdlc_raw
sethdlc hdlc0 hdlc
ifconfig hdlc0 up should work fine.

> - Then I hope that I should open a raw (SOCK_RAW) PF_PACKET socket
> with protocol IPPROTO_RAW? I am not using IP, so this does not seem to
> be the correct protocol, but...

Seems entirely correct.

> - And the address to sendto the data? Should it be formed just using
> the name of the interface or it requires more data?

No, all data is sent to the other end :-)

> Thanks. I know these should be really newbie questions, but I am
> finding difficult to know how to manage a "serial" device using a
> netdev interface.

Actually it's a bit different than normal async serial ports - HDLC
means packets.
-- 
Krzysztof Halasa
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