netdev - RE: [PATCH net-next-2.6 02/13] net-caif: add CAIF header files

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Date:	Fri, 22 Jan 2010 09:56:25 +0100
From:	Sjur Brændeland <sjur.brandeland@...ricsson.com>
To:	"Marcel Holtmann" <marcel@...tmann.org>
Cc:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<stefano.babic@...ic.homelinux.org>, <randy.dunlap@...cle.com>
Subject: RE: [PATCH net-next-2.6 02/13] net-caif: add CAIF header files

Marcel Holtmann wrote:
>> ...
>> CAIFSO_CHANNEL is used for specifying the physical interface to use
>> for the CAIF Channel. You can select the type of interface to use by
>> setting link_selector: CAIF_PHYPREF_LOW_LAT will typically be used
>> for AT (or other control traffic), and CAIF_PHYPREF_HIGH_BW for IP
>> traffic. 
>> When the CAIF interfaces registers itself it will inform about their
>> type, (low-latency or high-bandwidth). This approach assumes that you
>> have only one modem, but multiple links to it (e.g. USB and UART).
>> 
>> But you can also specify interface by name using link_name. In this
>> case you specify the name of the interface to use. I think this would
>> support your use case with multiple modems attached.
> 
> sounds good, but why using a socket option and not allowing to just
> use bind(). Maybe it is just my personal preference, because I am
> used to do it like this for TCP and Bluetooth.  

We actually considered this when designing the interface,
but I don't feel bind() fits in this case. bind() would normally bind
an address to the client socket. An interface did not seem
like a client socket address to us, so we decided to use sockopt instead.
Conceptually I don't think CAIF has a client address at all, it only
connects to a server side address.

BR/Sjur

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