Re: [RFC-2] Configuring Synchronous Interfaces in Linux

[Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>]

> Alan, what's the approach you'd feel more comfortable with:
> - One ioctl that passes a pointer to a known structure in ifr.ifr_data as 
>   its argument.
> - Several ioctl's, one for each parameter, that pass only the specific 
>   parameter new value as the argument.
> 
> The former is good because it relies on a _single_ ioctl. However, every
> time you change the ioctl structure you may lose backward compatibility.

One ioctl with a set of subcommands seems to be quite common