netdev - Re: [PATCHv2] tls: Add support for encryption using async offload accelerator

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Date:   Wed, 31 Jan 2018 19:48:08 +0200
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Dave Watson <davejwatson@...com>
Cc:     Vakul Garg <vakul.garg@....com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "ilyal@...lanox.com" <ilyal@...lanox.com>,
        "aviadye@...lanox.com" <aviadye@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCHv2] tls: Add support for encryption using async offload accelerator

On Wed, Jan 31, 2018 at 7:34 PM, Dave Watson <davejwatson@...com> wrote:
> On 01/31/18 05:22 PM, Vakul Garg wrote:
>> > > On second though in stable we should probably just disable async tfm
>> > > allocations.
>> > > It's simpler. But this approach is still good for -next
>> > >
>> > >
>> > > Gilad
>> >
>> > I agree with Gilad, just disable async for now.
>> >
>>
>> How to do it? Can you help with the api name?
>
> *aead = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
>
> https://github.com/ktls/net_next_ktls/commit/f3b9b402e755e4b0623fa83f88137173fc249f2d

I said disabling async tfms is the right way to go for -stable since
it's the simplest and less risky way
of plugging this bug.

I don't think this is the way to go for -next (and it seems davem
agrees with me). Vakul's
patch looks good to me for now.

>
>> > If the flag MSG_DONTWAIT is set, we should be returning -EINPROGRESS and
>> > not wait for a response.  I had started working on a patch for that, but it's
>> > pretty tricky to get right.
>>

That would be a great addition, but I don't think we need to wait for
that. It can come later.

Gilad
-- 
Gilad Ben-Yossef
Chief Coffee Drinker

"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
 -- Jean-Baptiste Queru