linux-kernel - Re: [PATCH for-next 8/9] RDMA/hns: Remove unused struct members in hns-abi.h

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Message-ID: <20170928130437.GV2297@mtr-leonro.local>
Date:   Thu, 28 Sep 2017 16:04:37 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     "Wei Hu (Xavier)" <xavier.huwei@...wei.com>
Cc:     dledford@...hat.com, linux-rdma@...r.kernel.org,
        lijun_nudt@....com, oulijun@...wei.com, charles.chenxin@...wei.com,
        liuyixian@...wei.com, xushaobo2@...wei.com,
        zhangxiping3@...wei.com, xavier.huwei@....com, linuxarm@...wei.com,
        linux-kernel@...r.kernel.org, shaobohsu@....com
Subject: Re: [PATCH for-next 8/9] RDMA/hns: Remove unused struct members in
 hns-abi.h

On Thu, Sep 28, 2017 at 07:56:40PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/9/28 17:02, Leon Romanovsky wrote:
> > On Thu, Sep 28, 2017 at 12:57:33PM +0800, Wei Hu (Xavier) wrote:
> > > From: Lijun Ou <oulijun@...wei.com>
> > >
> > > This patch mainly deletes some unused struct members for
> > > hns_roce_ib_create_qp in order to match libhns, because
> > > the num of struct members of hns_roce_ib_create_qp must
> > > be the same with hns_roce_create_qp in libhns.
> > >
> > > Signed-off-by: Lijun Ou <oulijun@...wei.com>
> > > Signed-off-by: Wei Hu (Xavier) <xavier.huwei@...wei.com>
> > > Signed-off-by: Shaobo Xu <xushaobo2@...wei.com>
> > > ---
> > >   include/uapi/rdma/hns-abi.h | 2 --
> > >   1 file changed, 2 deletions(-)
> > >
> > > diff --git a/include/uapi/rdma/hns-abi.h b/include/uapi/rdma/hns-abi.h
> > > index 5d74019..79251b6 100644
> > > --- a/include/uapi/rdma/hns-abi.h
> > > +++ b/include/uapi/rdma/hns-abi.h
> > > @@ -41,10 +41,8 @@ struct hns_roce_ib_create_cq {
> > >
> > >   struct hns_roce_ib_create_qp {
> > >   	__u64	buf_addr;
> > > -	__u64   db_addr;
> > >   	__u8    log_sq_bb_count;
> > >   	__u8    log_sq_stride;
> > > -	__u8    sq_no_prefetch;
> > >   	__u8    reserved[5];
> > >   };
> > It is classical UAPI breakage which kernel tries to avoid.
> >
> > In RDMA, we do allow rename of fields from reserved to something, but
> > don't allow binary layout change.
> >
> > NAK to this change.
> >
> > Thanks
> Hi, Leon
>     Now there is an inconsistency between hns_roce_ib_create_qp in kernel
> driver and hns_roce_create_qp  in libhns as below:
>
> struct hns_roce_create_qp {
>     struct ibv_create_qp        ibv_cmd;
>     __u64                buf_addr;
>     __u8                log_sq_bb_count;
>     __u8                log_sq_stride;
>     __u8                reserved[5];
> };
>     It is better to modify hns_roce_create_qp in libhns, right?

Yes, it can work, because it is user space problem, where you used wrong
structure.

Thanks

>     Thanks
>
>     Regards
> Wei Hu
> > > --
> > > 1.9.1
> > >
> > > --
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>
>
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