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

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Date:   Thu, 28 Sep 2017 19:56:40 +0800
From:   "Wei Hu (Xavier)" <xavier.huwei@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
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 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?
     Thanks

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