[dpdk-dev] [PATCH] mem: fix DMA mask width sanity check

Ferruh Yigit ferruh.yigit at intel.com
Wed Nov 7 12:47:40 CET 2018


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 at netronome.com>
>> ---
> 
> Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>

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


More information about the dev mailing list