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

[Wei Hu (Xavier)]

On 2017/9/28 21:04, Leon Romanovsky wrote:
> 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@xxxxxxxxxx>
> > > >
> > > > 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@xxxxxxxxxx>
> > > > Signed-off-by: Wei Hu (Xavier) <xavier.huwei@xxxxxxxxxx>
> > > > Signed-off-by: Shaobo Xu <xushaobo2@xxxxxxxxxx>
> > > > ---
> > > >    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, Leon
I will pull it out off this series in patch v2.
> >      Thanks
> >
> >      Regards
> > Wei Hu
> > > > --
> > > > 1.9.1
> > > >
> > > > --
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