ibv_query_qp_data_in_ordLibibverbs Programmer’s Mibvaquery_qp_data_in_order(3)
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 reader may poll for data instead of poll
for completion. This function indicates data is written in-order with-
in 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 post-
ed on this local QP. For RDMA write operations: describes or-
dering 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
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)
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