[dpdk-dev] [PATCH 1/2] mempool: use actual IOVA addresses when populating

[Olivier Matz]

On Thu, Nov 14, 2019 at 01:58:20PM +0000, Anatoly Burakov wrote:
> Currently, when mempool is being populated, we get IOVA address
> of every segment using rte_mem_virt2iova(). This works for internal
> memory, but does not really work for external memory, and does not
> work on platforms which return RTE_BAD_IOVA as a result of this
> call (such as FreeBSD). Moreover, even when it works, the function
> in question will do unnecessary pagewalks in IOVA as PA mode, as
> it falls back to rte_mem_virt2phy() instead of just doing a lookup in
> internal memseg table.
> 
> To fix it, replace the call to first attempt to look through the
> internal memseg table (this takes care of internal and external memory),
> and fall back to rte_mem_virt2iova() when unable to perform VA->IOVA
> translation via memseg table.
> 
> Fixes: 66cc45e293ed ("mem: replace memseg with memseg lists")

Shouldn't we also add
Fixes: 035ee5bea5ef ("mempool: remove optimistic IOVA-contiguous allocation")
?

>From what I understand, even if the problem existed in populate_virt()
before, this is the commit that makes the problem visible in most cases.

> Cc: stable at dpdk.org
> 
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>

Acked-by: Olivier Matz <olivier.matz at 6wind.com>