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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>,
	Alejandro Lucero <alejandro.lucero@netronome.com>,
	dev@dpdk.org
Subject: Re: [PATCH] mem: fix DMA mask width sanity check
Date: Wed, 7 Nov 2018 11:47:40 +0000	[thread overview]
Message-ID: <f9052a87-4913-6523-b468-4ec6b1d7d3ab@intel.com> (raw)
In-Reply-To: <ce6d0e01-1e61-8f6b-18aa-cc16f0f90a80@intel.com>

On 11/7/2018 10:14 AM, Burakov, Anatoly wrote:
> 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>

Tested-by: Ferruh Yigit <ferruh.yigit@intel.com>

  reply	other threads:[~2018-11-07 11:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-07  9:44 [PATCH] mem: fix DMA mask width sanity check Alejandro Lucero
2018-11-07 10:14 ` Burakov, Anatoly
2018-11-07 11:47   ` Ferruh Yigit [this message]
2018-11-07 13:43     ` Thomas Monjalon

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