netdev - Re: [PATCH v4 resend 21/23] RDMA/irdma: Add ABI definitions

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Date:   Wed, 7 Apr 2021 12:23:49 -0300
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, netdev@...r.kernel.org,
        david.m.ertman@...el.com, anthony.l.nguyen@...el.com,
        Mustafa Ismail <mustafa.ismail@...el.com>
Subject: Re: [PATCH v4 resend 21/23] RDMA/irdma: Add ABI definitions

On Tue, Apr 06, 2021 at 07:15:00PM -0500, 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 | 116 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 116 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..d994b0b
> +++ b/include/uapi/rdma/irdma-abi.h
> @@ -0,0 +1,116 @@
> +/* 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 5
> +
> +enum irdma_memreg_type {
> +	IW_MEMREG_TYPE_MEM  = 0,
> +	IW_MEMREG_TYPE_QP   = 1,
> +	IW_MEMREG_TYPE_CQ   = 2,
> +	IW_MEMREG_TYPE_RSVD = 3,
> +	IW_MEMREG_TYPE_MW   = 4,
> +};
> +
> +struct irdma_alloc_ucontext_req {
> +	__u32 rsvd32;
> +	__u8 userspace_ver;
> +	__u8 rsvd8[3];
> +};
> +
> +struct irdma_alloc_ucontext_resp {
> +	__u32 max_pds;
> +	__u32 max_qps;
> +	__u32 wq_size; /* size of the WQs (SQ+RQ) in the mmaped area */
> +	__u8 kernel_ver;
> +	__u8 rsvd[3];

So this reserved is to align and for compat with i40iw

> +	__aligned_u64 feature_flags;
> +	__aligned_u64 db_mmap_key;
> +	__u32 max_hw_wq_frags;
> +	__u32 max_hw_read_sges;
> +	__u32 max_hw_inline;
> +	__u32 max_hw_rq_quanta;
> +	__u32 max_hw_wq_quanta;
> +	__u32 min_hw_cq_size;
> +	__u32 max_hw_cq_size;
> +	__u32 rsvd1[7];

But what is this for?

> +	__u16 max_hw_sq_chunk;
> +	__u16 rsvd2[11];

And this?

Reserved should only be used for alignment reasons.

You saw the other explosive thread with Intel about this topic, right?

> +struct irdma_mem_reg_req {
> +	__u16 reg_type; /* Memory, QP or CQ */

Comment is better to clarify this is an enum irdma_memreg_type,
especially since it seems to be wrong?

Why is that enum prefixed with IW_?

Jason