linux-kernel - Re: [PATCH v2] IB/core: remove dead code

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Date:	Tue, 7 Jun 2016 05:42:59 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Sagi Grimberg <sagi@...htbits.io>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	leon@...nel.org
Subject: Re: [PATCH v2] IB/core: remove dead code

On Tue, Jun 07, 2016 at 03:41:04PM +0300, Sagi Grimberg wrote:
> Actually it looks like the data-integrity insert/strip operation
> (where protection sg list does not exist) is broken.
> 
> It looks that the protection scatterlist should be done only if
> prot_sg_count was provided...
> 
> I don't have access to mlx5 devices at the moment (still waiting
> to get some...)

I've reported the brokenness in the existing iSER code when I started
working on signature MR support in the generic API.  As no one helped
managed to figure out the issue or how it should operate I clone the
existing semantics, even given I knew they are broken.