From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1828C433E0 for ; Thu, 21 May 2020 11:01:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 896AB2072C for ; Thu, 21 May 2020 11:01:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728990AbgEULBi convert rfc822-to-8bit (ORCPT ); Thu, 21 May 2020 07:01:38 -0400 Received: from mout.kundenserver.de ([217.72.192.73]:59361 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727864AbgEULBg (ORCPT ); Thu, 21 May 2020 07:01:36 -0400 Received: from [192.168.1.164] ([37.4.249.202]) by mrelayeu.kundenserver.de (mreue107 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MvrRB-1ijc7H3acR-00svlL; Thu, 21 May 2020 13:00:36 +0200 Subject: Re: [PATCH v2 1/2] hwrng: iproc-rng200 - Set the quality value To: =?UTF-8?Q?=c5=81ukasz_Stelmach?= , Matt Mackall , Herbert Xu , Arnd Bergmann , Greg Kroah-Hartman , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Kukjin Kim , Krzysztof Kozlowski , Florian Fainelli , Markus Elfring , Matthias Brugger , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Stephan Mueller Cc: Bartlomiej Zolnierkiewicz References: <20200514190734.32746-1-l.stelmach@samsung.com> <20200519212552.11671-1-l.stelmach@samsung.com> <20200519212552.11671-2-l.stelmach@samsung.com> From: 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2020 13:00:33 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200519212552.11671-2-l.stelmach@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Content-Language: en-US X-Provags-ID: V03:K1:wSeZxaA80JDIXEos3QQhcoAX3+J60zcJMs5/9SF8aeESpoihHM5 K1zl2yVkMdew5ncODcaXO5nG8OvKsnm4xfE1c8Rk5OYck1IxWKx+Fbq/xI2lAmW3S5u33VE gSkAJzsRhLL6MUe/tGKdhNX37cGLtmRTh4GbToEb3OQWW5tqNcruXW3MCSv18wmiLVjDtce B5UOZ5aWybKGpAFO8Mfug== X-UI-Out-Filterresults: notjunk:1;V03:K0:RI1HL5WzdJw=:UZ/mpIT3Ode+hQtdaUDqGz cvhAwTDTPT2ebrRrDiGrkfLzApOzg2CCDpGsqq9lR3PaEFEmGGCQG4v1NtxxxficBiQN2wLQC rFY7lOl/EyzO26enSGe/Cs4i6cpbHcDFLyIJIrMCEcCfvdkJtlp2rZHgZaWGms4rPxs2y56nh yI05rD4r7YtMHzMq7yXcGBhx8VF0nmK/5e4K90c5y9iR6e2PEd+I/4LYYp0jEs7kRR8RSK0lc YHbwB6XCusQwfjKQqE3+OZTS6Vk+Jsk/Ub9sRutM1OTE+VkvX0C3/rZrho64qCKutYMrAsxaC SeTk3AUSAPR2Mb/eB7SJx2FNkPpqz4tE3BLsBx8IMsJ4Hzsi35pafBdByK+Lyfr0jS3I3WvM1 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The min-entropy value calculated using the most > common value estimate (NIST SP 800-90P[2], section 6.3.1) was 7.964464. could you please mention in the commit the used hardware implementation(s) of iproc-rng200 to get this quality? AFAIK there is still no public register description at least for the bcm2711. So is it safe to assume that the suggested quality applies to all possible configurations? Thanks Stefan > > [1] https://github.com/usnistgov/SP800-90B_EntropyAssessment > [2] https://csrc.nist.gov/publications/detail/sp/800-90b/final > > Signed-off-by: Łukasz Stelmach > --- > drivers/char/hw_random/iproc-rng200.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index 32d9fe61a225..95669ece050f 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -199,6 +199,7 @@ static int iproc_rng200_probe(struct platform_device *pdev) > priv->rng.read = iproc_rng200_read, > priv->rng.init = iproc_rng200_init, > priv->rng.cleanup = iproc_rng200_cleanup, > + priv->rng.quality = 1000, > > /* Register driver */ > ret = devm_hwrng_register(dev, &priv->rng);