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Date:	Thu, 06 Feb 2014 16:02:03 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Roland Dreier <roland@...nel.org>
Cc:	Or Gerlitz <or.gerlitz@...il.com>,
	Hefty Sean <sean.hefty@...el.com>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	target-devel <target-devel@...r.kernel.org>,
	Sagi Grimberg <sagig@...lanox.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: linux rdma 3.14 merge plans

Hi Roland,

On Tue, 2014-01-21 at 23:27 -0800, Nicholas A. Bellinger wrote:
> Roland & Co,
> 
> On Tue, 2014-01-21 at 16:43 -0800, Roland Dreier wrote:
> > On Tue, Jan 21, 2014 at 2:00 PM, Or Gerlitz <or.gerlitz@...il.com> wrote:
> > > Roland, ping! the signature patches were posted > three months ago. We
> > > deserve a response from the maintainer that goes beyond "I need to
> > > think on that".
> > >
> > > Responsiveness was stated by Linus to be the #1 requirement from
> > > kernel maintainers.
> > 
> > Or, I'm not sure what response you're after from me.  Linus has also
> > said that maintainers should say "no" a lot more
> > (http://lwn.net/Articles/571995/) so maybe you want me to say, "No, I
> > won't merge this patch set, since it adds a bunch of complexity to
> > support a feature no one really cares about."  Is that it? 
> 
> The patch set proposed by Sagi + Or is modest in terms of LOC to core IB
> code, and includes mostly mlx5 specific driver changes that enables HW
> offloads.
> 
> > (And yes I
> > am skeptical about this stuff — I work at an enterprise storage
> > company and even here it's hard to find anyone who cares about
> > DIF/DIX, especially offload features that stop it from being
> > end-to-end)
> > 
> 
> My understanding is most HBAs capable of T10 PI offload in DIX PASS +
> VERIFY mode are already implementing DIX INSERT + STRIP modes in various
> capacities to support legacy environments.
> 
> Beyond the DIX INSERT + STRIP case for enterprise storage, the amount of
> FC + SAS HBAs that already support T10 PI metadata is substantial.
> 
> > I'm sure you're not expecting me to say, "Sure, I'll merge it without
> > understanding the problem it's solving or how it's doing that,"
> > especially given the your recent history of pushing me to merge stuff
> > like the IP-RoCE patches back when they broke the userspace ABI.
> 
> With the merge window now upon us, there is a understandable reluctance
> to merge new features.  Given the amount of time the series has spent on
> the list, it is however a good candidate to consider for an exception.
> 
> Short of that, are you planning to accept the series for the next round
> once the current merge window closes..?
> 
> We'd really like to start enabling fabrics with these types of offloads
> for v3.15. 
> 

Now with the initial DIF backend taraget support in place for v3.14-rc1
code, we'd like to move forward on iser-target related pieces for T10
PI.

Can you give us an estimate of when you'll have some time to give
feedback on the outstanding patches..?

--nab

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