netdev - Re: [PATCH net-next-2.6 v6 08/12] net-caif: add CAIF socket implementation

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Date:	Mon, 15 Mar 2010 14:53:51 -0700
From:	Marcel Holtmann <marcel@...tmann.org>
To:	sjur.brandeland@...ricsson.com
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	daniel.martensson@...ricsson.com, kaber@...sh.net,
	stefano.babic@...ic.homelinux.org, randy.dunlap@...cle.com
Subject: Re: [PATCH net-next-2.6 v6 08/12] net-caif: add CAIF socket
 implementation

Hi Sjur,

> +	/*
> +	 * 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. 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.

Regards

Marcel


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