[dpdk-dev] AF_XDP PMD cannot use with software NICs
anatoly.burakov at intel.com
Tue May 28 11:40:09 CEST 2019
On 25-May-19 1:45 AM, Yutaro Hayakawa wrote:
> In current AF_XDP PMD implementation, we cannot use it with software NICs like VETH. Because it allocates umem with RTE_MEMZONE_IOVA_CONTIG.
> Since AF_XDP itself is usable with any network devices, I think it is better to have option to take umem with RTE_MEMZONE_SIZE_HINT_ONLY. It is also useful for testing perpose or using DPDK from containers.
I'm not sure i understand the problem. IOVA_CONTIG has no relation to
SIZE_HINT_ONLY - the former forces the allocation to be IOVA-contiguous.
The latter allows to allocate from other page sizes when the requested
one is not available, e.g. if you request memory with RTE_MEMZONE_1GB
and RTE_MEMZONE_SIZE_HINT_ONLY, it will try to allocate from 1GB pages
first, and if that fails, will allocate from any other page size
available - but says nothing about whether that memory has to be
What is the problem with allocating IOVA-contiguous memory for AF_XDP
> Any thought or future plan for this problem?
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