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From: Kim Phillips <kim.phillips@freescale.com>
To: yjin <yanjiang.jin@windriver.com>
Cc: <horia.geanta@freescale.com>, <herbert@gondor.apana.org.au>,
	<davem@davemloft.net>, <ruchika.gupta@freescale.com>,
	<cristian.stoica@freescale.com>, <NiteshNarayanLal@freescale.com>,
	<linux-crypto@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<jinyanjiang@gmail.com>
Subject: Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
Date: Thu, 5 Mar 2015 18:28:14 -0600	[thread overview]
Message-ID: <20150305182814.4a34d15df2638da5f20d1d29@freescale.com> (raw)
In-Reply-To: <54F7C4F5.1040204@windriver.com>

On Thu, 5 Mar 2015 10:52:37 +0800
yjin <yanjiang.jin@windriver.com> wrote:

> On 2015年03月05日 02:36, Kim Phillips wrote:
> > On Wed, 4 Mar 2015 13:33:22 +0800
> > yjin <yanjiang.jin@windriver.com> wrote:
> >
> >> On 2015年03月04日 03:31, Kim Phillips wrote:
> >>> On Tue, 3 Mar 2015 14:50:52 +0800
> >>> <yanjiang.jin@windriver.com> wrote:
> >>>
> >>>> -		dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN,
> >>>> -				 DMA_TO_DEVICE);
> >>>> +		dma_unmap_single(jrdev, ctx->sh_desc_dma,
> >>>> +				desc_bytes(ctx->sh_desc), DMA_TO_DEVICE);
> >>> alignment: the 'd' in desc_bytes should fall directly under the 'j'
> >>> in jrdev.
> >>>
> >>> Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ).
> >>
> >> I can't find the obvious limitation for the RNG descriptor length in
> >> Freescale documents, could you point out it?
> > ?  rng_create_sh_desc() creates a fixed descriptor of exactly 4
> > command-lengths.
> 
> Do you mean that the code itself limits the descriptor length? Not a 
> hardware limitation.

the code writes descriptors such that they don't reach h/w
limitations.

> If so, I prefer to dma_unmap with desc_bytes(ctx->sh_desc) as my 
> previous patch, and correct DESC_RNG_LEN to (4 * CAAM_CMD_SZ).

please.

Kim

  reply	other threads:[~2015-03-06  0:33 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-03  6:50 [PATCH 0/3] fix some CAAM warnings yanjiang.jin
2015-03-03  6:50 ` [PATCH 1/3] crypto: caam: fix some compile warnings yanjiang.jin
2015-03-03 18:59   ` Kim Phillips
2015-03-04  2:32     ` yjin
2015-03-04  4:57       ` yjin
2015-03-04  9:03         ` Cristian Stoica
2015-03-04 18:34           ` Kim Phillips
2015-03-05  7:12             ` Cristian Stoica
2015-03-06  0:38               ` Kim Phillips
2015-03-04  8:48       ` Cristian Stoica
2015-03-04  9:11       ` Cristian Stoica
2015-03-03  6:50 ` [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem yanjiang.jin
2015-03-03 19:31   ` Kim Phillips
2015-03-04  5:33     ` yjin
2015-03-04 18:36       ` Kim Phillips
2015-03-05  2:52         ` yjin
2015-03-06  0:28           ` Kim Phillips [this message]
2015-03-03  6:50 ` [PATCH 3/3] crypto: caamhash: - fix uninitialized edesc->sec4_sg_bytes field yanjiang.jin
2015-03-03 13:39 ` [PATCH 0/3] fix some CAAM warnings Horia Geantă

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