[OpenWrt-Devel] [PATCH RFC 0/5] ath79: add micro non-physical true RNG based on timing jitter

Etienne Champetier champetier.etienne at gmail.com
Mon May 27 06:07:19 PDT 2019


Hi Petr,

Le lun. 27 mai 2019 à 10:00, Petr Štetiar <ynezz at true.cz> a écrit :
>
> Etienne Champetier <champetier.etienne at gmail.com> [2019-05-25 12:43:25]:
>
> > Just to be clear i'm 100% in favor of your effort to have random pool init
> > done fast on all devices, and your solution, based on Stephan awsome work,
> > seems really good I just want to be sure we don't make some devices worse /
> > are not missing something
>
> FYI, I've just added more devices to the testing before submitting the next
> round of patches, and got following on the MT7620A based device:
>
>  root at OpenWrt:/# cat /proc/cpuinfo
>  system type             : MediaTek MT7620A ver:2 eco:6
>  machine                 : BDCOM WAP2100-SK
>  processor               : 0
>  cpu model               : MIPS 24KEc V5.0
>
>  root at OpenWrt:/# cat /sys/devices/system/clocksource/clocksource0/available_clocksource
>  systick MIPS
>
>  root at OpenWrt:/# /sbin/urngd
>  jent-rng init failed, err: 2
>
> Where that error 2 is ECOARSETIME. It makes me wonder if there's something
> which could be tweaked on kernel side in order to provide better environment
> for jent-rng on this quite still popular SoC.

The fact that missing high precision timer is properly detected is a good news,
but now that means you really need to provide a fallback, else
removing urandom-seed is a regression

>
> -- ynezz



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