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

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Message-ID: <7bdafebdab4a423a8c6fecd0684fedbb@intel.com>
Date:   Wed, 7 Apr 2021 20:57:47 +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>,
        "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 v4 resend 21/23] RDMA/irdma: Add ABI definitions

> 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.

Understood.

> 
> 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_?
> 

Will fix.