linux-kernel - Re: [PATCH] IB: make INFINIBAND_ADDR

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Date:   Mon, 16 Apr 2018 04:02:12 +0000
From:   Greg Thelen <gthelen@...gle.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        linux-rdma@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Tarick Bedeir <tarick@...gle.com>
Subject: Re: [PATCH] IB: make INFINIBAND_ADDR_TRANS configurable

On Sun, Apr 15, 2018 at 5:06 AM Christoph Hellwig <hch@...radead.org> wrote:

> On Fri, Apr 13, 2018 at 12:06:44AM -0700, Greg Thelen wrote:
> > Allow INFINIBAND without INFINIBAND_ADDR_TRANS.

> Why?  We are pushing everyone heavily to use RDMA/CM, so making it
> optional seems rather counter-intuitive.

Bugs.  We don't currently use CM.  But fuzzy testing has been finding a
fair number CM bugs, so we were thinking of disabling it until we need it.

> You'll also have to fix tons of ULPs to explicitly depend on
> INFINIBAND_ADDR_TRANS, or make code conditional on it.

I think I've identified the set of options which use
INFINIBAND_ADDR_TRANS without a kconfig depends:
* CIFS_SMB_DIRECT
* INFINIBAND_SRPT
* NVME_RDMA
* NVME_TARGET_RDMA

I have patches for the above, but need to finish the commit logs.  Let me
know if they'll be nacked and I'll just patch my kernel and forget
upstreaming.