netdev - Re: [rdma 14/16] RDMA/irdma: Add ABI definitions

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Message-ID: <20190704121933.GD3401@mellanox.com>
Date:   Thu, 4 Jul 2019 12:19:36 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Mustafa Ismail <mustafa.ismail@...el.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "poswald@...e.com" <poswald@...e.com>,
        "david.m.ertman@...el.com" <david.m.ertman@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>
Subject: Re: [rdma 14/16] RDMA/irdma: Add ABI definitions

On Thu, Jul 04, 2019 at 10:40:21AM +0300, Leon Romanovsky wrote:
> On Wed, Jul 03, 2019 at 07:12:57PM -0700, Jeff Kirsher wrote:
> > From: Mustafa Ismail <mustafa.ismail@...el.com>
> >
> > Add ABI definitions for irdma.
> >
> > Signed-off-by: Mustafa Ismail <mustafa.ismail@...el.com>
> > Signed-off-by: Shiraz Saleem <shiraz.saleem@...el.com>
> >  include/uapi/rdma/irdma-abi.h | 130 ++++++++++++++++++++++++++++++++++
> >  1 file changed, 130 insertions(+)
> >  create mode 100644 include/uapi/rdma/irdma-abi.h
> >
> > diff --git a/include/uapi/rdma/irdma-abi.h b/include/uapi/rdma/irdma-abi.h
> > new file mode 100644
> > index 000000000000..bdfbda4c829e
> > +++ b/include/uapi/rdma/irdma-abi.h
> > @@ -0,0 +1,130 @@
> > +/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
> > +/* Copyright (c) 2006 - 2019 Intel Corporation.  All rights reserved.
> > + * Copyright (c) 2005 Topspin Communications.  All rights reserved.
> > + * Copyright (c) 2005 Cisco Systems.  All rights reserved.
> > + * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
> > + */
> > +
> > +#ifndef IRDMA_ABI_H
> > +#define IRDMA_ABI_H
> > +
> > +#include <linux/types.h>
> > +
> > +/* irdma must support legacy GEN_1 i40iw kernel
> > + * and user-space whose last ABI ver is 5
> > + */
> > +#define IRDMA_ABI_VER 6
> 
> Can you please elaborate about it more?
> There is no irdma code in RDMA yet, so it makes me wonder why new define
> shouldn't start from 1.

It is because they are ABI compatible with the current user space,
which raises the question why we even have this confusing header
file..

I think this needs to be added after you delete the old driver.

Jason