[OpenWrt-Devel] [RFC/RFT PATCH] ath9k: implement kthread entropy collection for AR5008 and AR9002 PHYs.

[Rui Salvaterra]

On Fri, 31 Jan 2020 at 08:12, Felix Fietkau <nbd at nbd.name> wrote:
>
> For at least AR5008 and AR9002, but probably also for AR9003 I would
> like to keep the behavior of collecting entropy only once at driver
> initialization.
> Last time I worked on this I noticed that on several chips, sampling
> entropy during normal operation caused stability issues that were hard
> to pin down but quite noticeable.
> I think the benefit of continuous entropy collection is simply not worth
> the extra cost of potential stability issues and debugging time.
>
> - Felix

Hi again, Felix,

FWIW, this patch has just survived a whole weekend of rngtest <
/dev/random on a Buffalo WZR-HP-AG300H (dual AR9002). Output follows:

root at AP157427:~# rngtest < /dev/random
rngtest 6.6
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions.  There
is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

rngtest: starting FIPS tests...
^Crngtest: bits received from input: 224241980032
rngtest: FIPS 140-2 successes: 11203058
rngtest: FIPS 140-2 failures: 9041
rngtest: FIPS 140-2(2001-10-10) Monobit: 1165
rngtest: FIPS 140-2(2001-10-10) Poker: 1175
rngtest: FIPS 140-2(2001-10-10) Runs: 3340
rngtest: FIPS 140-2(2001-10-10) Long run: 3405
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=165.459; avg=1025.932; max=1093.147)Kibits/s
rngtest: FIPS tests speed: (min=503.707; avg=14584.165; max=14920.741)Kibits/s
rngtest: Program run time: 228508694816 microseconds

Best regards,
Rui

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