Messages in this thread | | | Date | Tue, 9 Aug 2016 16:57:10 +0000 | From | Jason Cooper <> | Subject | Re: [PATCH] hwrng: core - Allow for multiple simultaneous active hwrng devices |
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Hi Keith, Herbert,
On Tue, Aug 09, 2016 at 05:50:58PM +0800, Herbert Xu wrote: > On Mon, Jul 25, 2016 at 01:07:35PM -0700, Keith Packard wrote: > > Instead of having only one hwrng feeding /dev/random at a time, maintain > > a list of devices and cycle between them when filling the entropy pool. > > > > Signed-off-by: Keith Packard <keithp@keithp.com> > > So you're cycling RNGs even for user-space reads? That could be > problematic because not all hardware RNGs carry the maximum amount > of entropy. It would be rather annoying to be cycling between > RNGs of different qualities. > > Perhaps only cycle for the kernel hwrngd?
Perhaps a /dev/hwrng[0-9] per rng? That would lend itself nicely to a sysfs interface for per device quality, rate, and enabled attributes. e.g. /sys/class/hw_random/hwrng0/{device/,quality,rate,enabled}
/dev/hwrng could pull from the one with the highest quality, or user specified for backwards compatibility.
thx,
Jason.
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