netdev - Re: [PATCH 3/6] IrDA: IrLAP raw mode

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Date:	Fri, 16 Mar 2007 11:02:04 +0100
From:	Ingo Oeser <netdev@...eo.de>
To:	Samuel Ortiz <samuel@...tiz.org>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	irda-users@...ts.sourceforge.net, Jean Tourrilhes <jt@....hp.com>
Subject: Re: [PATCH 3/6] IrDA: IrLAP raw mode

Hi Samuel,

Samuel Ortiz wrote:
> This patch allows us to bypass the IrDA stack down to the IrLAP level.
> Sending and receiving frames is done through a character device.
> This is useful for e.g. doing real IrDA sniffing, testing external IrDA
> stacks and for Lirc (once I will add the framing disabling switch).

Nice!
 
> --- /dev/null
> +++ b/include/net/irda/irlap_raw.h
> @@ -0,0 +1,27 @@
> +/*
> + * Copyright (C) 2007 Samuel Ortiz (samuel@...tiz.org)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation, version 2.
> + *
> + */
> +
> +#ifndef _IRLAP_RAW_H
> +#define _IRLAP_RAW_H
> +
> +#ifdef CONFIG_IRDA_RAW
> +
> +int irlap_raw_recv_frame(struct sk_buff *skb, struct net_device *dev);
> +int irlap_raw_register_device(struct net_device * dev);
> +int irlap_raw_unregister_device(struct net_device * dev);
> +
> +#else
> +
> +#define irlap_raw_recv_frame(skbuff, netdev)
> +#define irlap_raw_register_device(netdev)
> +#define irlap_raw_unregister_device(netdev)

This stuff is usually done this way (functions, which just check arguments and do nothing):

static inline int irlap_raw_recv_frame(struct sk_buff *skb, struct net_device *dev)
{
	if (skb == NULL)
		return -EINVAL;

	if (dev->atalk_ptr == NULL)
		return -ENODEV;

	return 0;
}

static inline int irlap_raw_register_device(struct net_device * dev)
{
	if (dev == NULL)
		return -ENODEV;
	return 0;
}

statice inline int irlap_raw_unregister_device(struct net_device * dev)
{
	if (dev == NULL)
		return -ENODEV;
	return 0;
}


> --- a/net/irda/irlap_event.c
> +++ b/net/irda/irlap_event.c
> @@ -241,6 +241,11 @@ void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event,
>  	if (!self || self->magic != LAP_MAGIC)
>  		return;
>  
> +       if (self->raw_mode)
> +               return;
> +#endif
> +

I would suggest a small helper function here, which compiles into a constant, 
if raw_mode is not compiled in.

like

#ifdef CONFIG_IRDA_RAW
static inline int irlap_raw_mod(struct irlap_cb *self)
{
	return self->raw_mode;
}
#else
static inline int irlap_raw_mod(struct irlap_cb *self)
{
	return 0;
}
#endif


Best Regards

Ingo Oeser
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