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Date:	Wed, 17 Mar 2010 12:04:11 +0100
From:	Sjur BRENDELAND <>
To:	Marcel Holtmann <>
Cc:	"" <>,
	"" <>,
	Daniel MARTENSSON <>,
	"" <>,
	"" <>
Subject: RE: [PATCH net-next-2.6 v6 08/12] net-caif: add CAIF socket

Hi Marcel,
>> >> +	 * The sock->type specifies the socket type to use. The CAIF
>> >> socket is +	 * a packet stream in the sence that it is packet based.
>> >> +	 * CAIF trusts the reliability of the link, no resending is
>> >> implemented. +	 */ +	if (sock->type != SOCK_SEQPACKET)
>> >> +		return -ESOCKTNOSUPPORT;
>> > 
>> > we came to an interesting detail here when testing with a STE modem.
>> > Why is this SEQPACKET and not a STREAM.
>> The reason is that CAIF provides different services not just AT,
>> and some of them are really packet oriented such as Utility links and
>> Video. It would not be right to provide a stream based solution in this case.
>> > Especially with the AT
>> > command channels it is kinda weird that you have an MTU. The AT
>> > specification doesn't really have any defined behavior when using a
>> > sequential packet transport. It is more a stream based socket.
>> Yes I see your point. In order to limit the effort and simplify
>> caif_socket we ended up implementing only SEQPACKET. 
>I think we need to split this. Use SEQPACKET for packet based services
>and have STREAM for AT command channel.
>So while this might cause internally some more code. It would take away
>the complexity from userspace to turn it into a stream. And that is what
>the userspace is expecting.

Ok Marcel, I'll look into supporting both STREAM and SEQPACKET.

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