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

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Date:   Mon, 1 Feb 2021 15:21:21 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Saleem, Shiraz" <shiraz.saleem@...el.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

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.

It looks like nothing hard, where is the problem?

Jason