ibv_query_qp_data_in_order - Man Page
check if qp data is guaranteed to be in order.
Synopsis
#include <infiniband/verbs.h> int ibv_query_qp_data_in_order(struct ibv_qp *qp, enum ibv_wr_opcode op, uint32_t flags);
Description
ibv_query_qp_data_in_order() Checks whether WQE data is guaranteed to be written in-order, and thus reader may poll for data instead of poll for completion. This function indicates data is written in-order within each WQE, but cannot be used to determine ordering between separate WQEs. This function describes ordering at the receiving side of the QP, not the sending side.
Arguments
- qp
The local queue pair (QP) to query.
- op
The operation type to query about. Different operation types may write data in a different order.
For RDMA read operations: describes ordering of RDMA reads posted on this local QP. For RDMA write operations: describes ordering of remote RDMA writes being done into this local QP. For RDMA send operations: describes ordering of remote RDMA sends being done into this local QP. This function should not be used to determine ordering of other operation types.
- flags
Extra field for future input. For now must be 0.
Return Value
ibv_query_qp_data_in_order() Returns 1 if the data is guaranteed to be written in-order, 0 otherwise.
Notes
Return value is valid only when the data is read by the CPU and relaxed ordering MR is not the target of the transfer.
See Also
Author
Patrisious Haddad <phaddad@nvidia.com>
Yochai Cohen <yochai@nvidia.com>