在 2019/1/22 10:23, Jason Gunthorpe 写道:
> On Tue, Jan 22, 2019 at 10:23:34AM +0800, Lijun Ou wrote:
>> The hns_roce_ib_create_srq_resp is used to interact with the
>> user for data. As a result, it is added to apply with matching
>> kernel headers.
>>
>> Signed-off-by: Lijun Ou <oulijun@xxxxxxxxxx>
>> include/uapi/rdma/hns-abi.h | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/include/uapi/rdma/hns-abi.h b/include/uapi/rdma/hns-abi.h
>> index ef3c7ec..eb76b38 100644
>> +++ b/include/uapi/rdma/hns-abi.h
>> @@ -52,6 +52,11 @@ struct hns_roce_ib_create_srq {
>> __aligned_u64 que_addr;
>> };
>>
>> +struct hns_roce_ib_create_srq_resp {
>> + __u32 srqn;
>> + __u32 reserved;
>> +};
>> +
> This makes no sense, how can uapi headers be added without adding a
> corresponding kernel code!?!?! What fills in srqn?
>
> Jason
The srqn will be obtained from hns_roce_bitmap_alloc in the kernel mode. When create srq, it need to
transfer srqn to user by ib_copy_to_udata function. the ofed will report srqn by ib_uverbs_create_srq_resp,
nextly, the user will use it by resp.srqn when run hns_roce_u_create_srq function.
cmdof hns_roce_create_srq need be declared by DECLARE_DRV_CMD. for example,
DECLARE_DRV_CMD(hns_roce_create_srq, IB_USER_VERBS_CMD_CREATE_SRQ, hns_roce_ib_create_srq, hns_roce_ib_create_srq_resp);
lastly, it will be used to issue srq db by srqn when post srq recv in user mode.
>
