netdev - Re: [PATCH 11/16] esp: Use a synchronous crypto algorithm on offloading.

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Date:   Fri, 21 Apr 2017 13:29:34 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 11/16] esp: Use a synchronous crypto algorithm on
 offloading.

On Thu, Apr 20, 2017 at 12:50:29PM +0200, Steffen Klassert wrote:
> On Thu, Apr 20, 2017 at 05:52:35PM +0800, Herbert Xu wrote:
> > On Thu, Apr 20, 2017 at 11:17:52AM +0200, Steffen Klassert wrote:
> > >
> > > I tried to use async algorithms but it lead to serveral problems.
> > > The GSO layer can't handle async returns, we'd need callbacks
> > > for all the GSO handlers. Also we need something where we can
> > > requeue packets if the driver is busy etc.
> > 
> > Why would we need to requeue? As it is if you get an EBUSY on
> > an IPsec packet it's simply dropped.
> 
> Yes we could do this, but the GSO problem remain.
> 
> We discussed this last year at netdevconf but could not come
> up with an acceptable solutuion.

Why is it a problem exactly?

> For now this is just a fallback to make hardware offloading
> possible at all, so this is slowpath anyway. Allowing async
> algorithms can (and should) be done in a second step once we
> found a not too intrusive solution.

OK, as long as nobody gets silently switched from async to sync
then it's fine with me.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt