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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: David Marchand <david.marchand@redhat.com>, Li Feng <fengli@smartx.com>
Cc: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>,
	Bruce Richardson <bruce.richardson@intel.com>,
	Feng Li <lifeng1519@gmail.com>, dev <dev@dpdk.org>,
	Kyle Zhang <kyle@smartx.com>, Yang Fan <fanyang@smartx.com>
Subject: Re: [dpdk-dev] [PATCH] librte_eal: add APIs to speedup virt2iova/phys
Date: Thu, 1 Apr 2021 11:38:28 +0100
Message-ID: <efe667fe-f419-d7ed-70e2-e777adc97c9f@intel.com> (raw)
In-Reply-To: <CAJFAV8wZ17htmb9a9SsQNd1gDCF7FGt90eqXyAaQyEumUuKD+A@mail.gmail.com>

On 25-Mar-21 1:32 PM, David Marchand wrote:
> Hello,
> 
> On Mon, Apr 20, 2020 at 4:13 PM Li Feng <fengli@smartx.com> wrote:
>>
>> Cool, thank you, Anatoly and Kozlyuk.
>>
>> I haven't found how Windows implements the rte_mem_virt2phy.
>>
>> Using an opaque structure pointer as the first argument is a good idea.
> 
> I pinged about this patch status 6 months ago but got no reply.
> Trying again in public.
> 
>  From the thread, I understand that at best it would have to be done differently.
> 

I would agree with the latter. Like i said in my original response, the 
fd-less API's are already on the very of what's acceptable and in the 
perfect world we wouldn't have them in the first place, and i don't like 
the fact that they exist and would wholly discourage their use, mainly 
because of very confusing semantics of real physical address vs. DPDK's 
IOVA vs. user IOVA, and potential for errors due to trying to resolve an 
IOVA address of something that doesn't even have it.

Given the above, I certainly don't like the idea of building on top of 
these API's.

-- 
Thanks,
Anatoly

  parent reply	other threads:[~2021-04-01 10:38 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20 11:09 Li Feng
2020-04-20 12:16 ` Burakov, Anatoly
2020-04-20 13:07   ` Dmitry Kozlyuk
2020-04-20 14:13     ` Li Feng
2021-03-25 13:32       ` David Marchand
2021-03-29  6:26         ` Li Feng
2021-04-01 10:38         ` Burakov, Anatoly [this message]
2021-04-06 10:40           ` Feng Li
2021-04-06 11:23             ` David Marchand

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