netdev - RE: [PATCH 20/22] RDMA/irdma: Add ABI definitions

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Message-ID: <95c86ea5f5e94d068e6e0467ccba33a0@intel.com>
Date:   Fri, 5 Feb 2021 20:12:28 +0000
From:   "Saleem, Shiraz" <shiraz.saleem@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     "dledford@...hat.com" <dledford@...hat.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "Ismail, Mustafa" <mustafa.ismail@...el.com>
Subject: RE: [PATCH 20/22] RDMA/irdma: Add ABI definitions

> Subject: Re: [PATCH 20/22] RDMA/irdma: Add ABI definitions
> 
> On Sat, Jan 30, 2021 at 01:18:36AM +0000, Saleem, Shiraz wrote:
> > > Subject: Re: [PATCH 20/22] RDMA/irdma: Add ABI definitions
> > >
> > > On Fri, Jan 22, 2021 at 05:48:25PM -0600, Shiraz Saleem 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 | 140
> > > > ++++++++++++++++++++++++++++++++++++++++++
> > > >  1 file changed, 140 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
> > > > 0000000..d9c8ce1
> > > > +++ b/include/uapi/rdma/irdma-abi.h
> > > > @@ -0,0 +1,140 @@
> > > > +/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR
> > > > +Linux-OpenIB) */
> > > > +/*
> > > > + * Copyright (c) 2006 - 2021 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
> > >
> > > I don't want to see this value increase, either this is ABI
> > > compatible with i40iw or it is not and should be a new driver_id.
> >
> > I am not sure I understand how it's possible without a ver. bump.
> > We support user-space libirdma with this driver as well as libi40iw.
> 
> Well, start by not making gratuitous changes to the structure layouts and then ask
> how to handle what you have left over.
> 

Took a while but following now. We ll PoC and see how this shapes out. Thanks!