[dpdk-dev] [PATCH v3 0/4] Allow using external memory without malloc

Stephen Hemminger stephen at networkplumber.org
Thu Dec 20 17:16:46 CET 2018


On Thu, 20 Dec 2018 15:32:37 +0000
Anatoly Burakov <anatoly.burakov at intel.com> wrote:

> Currently, the only way to use externally allocated memory
> is through rte_malloc API's. While this is fine for a lot
> of use cases, it may not be suitable for certain other use
> cases like manual memory management, etc.
> 
> This patchset adds another API to register memory segments
> with DPDK (so that API's like ``rte_mem_virt2memseg`` could
> be relied on by PMD's and such), but not create a malloc
> heap out of them.
> 
> Aside from the obvious (not adding memory to a heap), the
> other major difference between this API and the
> ``rte_malloc_heap_*`` external memory functions is the fact
> that no DMA mapping is performed automatically, as well as
> no mem event callbacks are triggered.
> 
> This really draws a line in the sand, and there are now two
> ways of doing things - do everything automatically (using
> the ``rte_malloc_heap_*`` API's), or do everything manually
> (``rte_extmem_*`` and future DMA mapping API [1] that would
> replace ``rte_vfio_dma_map``). This way, the consistency of
> API is kept, and flexibility is also allowed.
> 
> [1] https://mails.dpdk.org/archives/dev/2018-November/118175.html

Where are the examples for this? Give a sample application maybe.

Also there are no test cases.


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