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

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Date:   Fri, 29 Sep 2017 00:12:57 +0800
From:   "Wei Hu (Xavier)" <xavier.huwei@....com>
To:     Leon Romanovsky <leon@...nel.org>,
        "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, 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 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@...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, Leon
I will pull it out off this series in patch v2.
>>      Thanks
>>
>>      Regards
>> Wei Hu
>>>> --
>>>> 1.9.1
>>>>
>>>> --
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