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SubjectRe: [RFC-2] Configuring Synchronous Interfaces in Linux
> 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

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