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

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Date:   Mon, 25 Jan 2021 15:45:15 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Shiraz Saleem <shiraz.saleem@...el.com>
CC:     <dledford@...hat.com>, <kuba@...nel.org>, <davem@...emloft.net>,
        <linux-rdma@...r.kernel.org>, <gregkh@...uxfoundation.org>,
        <netdev@...r.kernel.org>, <david.m.ertman@...el.com>,
        <anthony.l.nguyen@...el.com>,
        Mustafa Ismail <mustafa.ismail@...el.com>
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.

This should have a small diff against include/uapi/rdma/i40iw-abi.h
that is obviously compatible

> +struct irdma_create_qp_resp {
> +	__u32 qp_id;
> +	__u32 actual_sq_size;
> +	__u32 actual_rq_size;
> +	__u32 irdma_drv_opt;
> +	__u32 qp_caps;
> +	__u16 rsvd1;
> +	__u8 lsmm;
> +	__u8 rsvd2;
> +};

> +struct i40iw_create_qp_resp {
> +	__u32 qp_id;
> +	__u32 actual_sq_size;
> +	__u32 actual_rq_size;
> +	__u32 i40iw_drv_opt;
> +	__u16 push_idx;
> +	__u8 lsmm;
> +	__u8 rsvd;
> +};

For instance these are almost the same, why put qp_caps in the middle?
Add it to the end so the whole thing is properly compatible with a
single structure.

Jason