Re: USB filter driver

Pete Zaitcev <[email protected]>
Newsgroups gmane.linux.usb.devel
Organization Red Hat, Inc.
Message-ID <[email protected]>
On Fri, 2 Nov 2007 17:38:32 +0000 (GMT), bifferos <[email protected]> wrote:

> [] Once your 'driver' is implemented as a 
> normal process you can decide whether to migrate it to 
> a real kernel driver, or if performance is acceptable leave
> it as-is.
> [] My interest is only in
> implementing functionality in the highest-level 
> language possible (maybe even Perl) to get the job 
> done.

This sounds like a dubious way of doing things. It only seems
superficially attractive because you place a high cost on programming
inside the kernel. But in fact in-kernel programming not all that hard.
It's harder to support the loopback into user space properly. Any such
"filter" or "shim" requires very careful engineering. Just look at the
fiasco of Machek's NBD to appreciate what you're handwaving away.
So, my personal suggestion is to reconsider your approach.

-- Pete

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