linux-kernel - Re: [PATCH 3/5] ib_srpt: depend on INFINIBAND_ADDR

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Date:   Tue, 01 May 2018 13:08:48 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     Greg Thelen <gthelen@...gle.com>, Jason Gunthorpe <jgg@...pe.ca>
Cc:     Bart Van Assche <Bart.VanAssche@....com>,
        Christoph Hellwig <hch@....de>, linux-rdma@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Tarick Bedeir <tarick@...gle.com>
Subject: Re: [PATCH 3/5] ib_srpt: depend on INFINIBAND_ADDR_TRANS

On Tue, 2018-05-01 at 03:08 +0000, Greg Thelen wrote:
> On Mon, Apr 30, 2018 at 4:35 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
> 
> > On Wed, Apr 25, 2018 at 03:33:39PM -0700, Greg Thelen wrote:
> > > INFINIBAND_SRPT code depends on INFINIBAND_ADDR_TRANS provided symbols.
> > > So declare the kconfig dependency.  This is necessary to allow for
> > > enabling INFINIBAND without INFINIBAND_ADDR_TRANS.
> > > 
> > > Signed-off-by: Greg Thelen <gthelen@...gle.com>
> > > Cc: Tarick Bedeir <tarick@...gle.com>
> > >  drivers/infiniband/ulp/srpt/Kconfig | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/infiniband/ulp/srpt/Kconfig
> 
> b/drivers/infiniband/ulp/srpt/Kconfig
> > > index 31ee83d528d9..fb8b7182f05e 100644
> > > +++ b/drivers/infiniband/ulp/srpt/Kconfig
> > > @@ -1,6 +1,6 @@
> > >  config INFINIBAND_SRPT
> > >       tristate "InfiniBand SCSI RDMA Protocol target support"
> > > -     depends on INFINIBAND && TARGET_CORE
> > > +     depends on INFINIBAND && INFINIBAND_ADDR_TRANS && TARGET_CORE
> > Isn't INFINIBAND && INFINIBAND_ADDR_TRANS a bit redundant? Can't have
> > INFINIBAND_ADDR_TRANS without INFINIBAND.
> 
> By kconfig INFINIBAND_ADDR_TRANS depends on INFINIBAND.  So yes, it seems
> redundant.  I don't know if anyone has designs to break this dependency and
> allow for ADDR_TRANS without INFINIBAND.

No, not at the moment (and I'm not sure we ever would, it would only
happen if the subsystem itself became something like RDMA and INFINIBAND
specifically related only to the INFINIBAND link layer support, in which
case you might want to enable RoCE without INFINIBAND or something like
that, but no one has plans to do that as far as I'm aware).

>   Assuming not, I'd be willing to
> amend my series removing redundant INFINIBAND and a followup series to
> remove it from similar depends.  Though I'm not familiar with rdma dev tree
> lifecycle.  Is rdma/for-rc a throw away branch (akin to linux-next), or
> will it be merged into linus/master?  If throwaway, then we can amend
> its patches, otherwise followups will be needed.

Followups will be needed.

> Let me know what you'd prefer.  Thanks.
> 
> FYI from v4.17-rc3:
> drivers/staging/lustre/lnet/Kconfig:  depends on LNET && PCI && INFINIBAND
> && INFINIBAND_ADDR_TRANS
> net/9p/Kconfig:       depends on INET && INFINIBAND && INFINIBAND_ADDR_TRANS
> net/rds/Kconfig:      depends on RDS && INFINIBAND && INFINIBAND_ADDR_TRANS
> net/sunrpc/Kconfig:   depends on SUNRPC && INFINIBAND &&
> INFINIBAND_ADDR_TRANS

-- 
Doug Ledford <dledford@...hat.com>
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