NAME

       ibv_query_qp_data_in_order - 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 read‐
       er  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 RD‐
              MA  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

       ibv_query_qp(3)

AUTHOR

       Patrisious Haddad <phaddad@nvidia.com>

       Yochai Cohen <yochai@nvidia.com>

libibverbs                                          2020-3-3                       ibv_query_qp_data_in_order(3)