From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Alejandro Lucero <alejandro.lucero@netronome.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] mem: fix DMA mask width sanity check
Date: Wed, 7 Nov 2018 10:14:30 +0000 [thread overview]
Message-ID: <ce6d0e01-1e61-8f6b-18aa-cc16f0f90a80@intel.com> (raw)
In-Reply-To: <20181107094456.23123-1-alejandro.lucero@netronome.com>
On 07-Nov-18 9:44 AM, Alejandro Lucero wrote:
> Current code has different max DMA mask width values for 32 and 64
> bits systems. IOMMU hardware could report a higher supported width
> than current MAX_DMA_MASK_BITS when RTE_ARCH_64 is not defined. This
> is actually true with a 32 bits kernel running in a 64 bits server
> with IOMMU hardware. This could also be a problem with embedded systems
> using an IOMMU designed for 64 bits in a 32 bits system.
>
> This patch leaves a single max DMA mask width which will make sure the
> mask width is within the range for 64 bits variables used for DMA mask.
> This also will avoid wrong values because any value higher than
> 64 bits is likely wrong.
>
> Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
> ---
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
--
Thanks,
Anatoly
next prev parent reply other threads:[~2018-11-07 10:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 9:44 Alejandro Lucero
2018-11-07 10:14 ` Burakov, Anatoly [this message]
2018-11-07 11:47 ` Ferruh Yigit
2018-11-07 13:43 ` Thomas Monjalon
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