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This manual page is derived from the DAT/uDAPL 1.2 specification.
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dat_rmr_bind - bind the RMR to the specified memory region within an LMR

cc [ flag.\|.\|. ] file.\|.\|. -ldat [ library.\|.\|. ]
#include <dat/udat.h>

DAT_RETURN
 dat_rmr_bind(
 IN DAT_RMR_HANDLE rmr_handle,
 IN DAT_LMR_TRIPLET *lmr_triplet,
 IN DAT_MEM_PRIV_FLAGS mem_privileges,
 IN DAT_EP_HANDLE ep_handle,
 IN DAT_RMR_COOKIE user_cookie,
 IN DAT_COMPLETION_FLAGS completion_flags,
 OUT DAT_RMR_CONTEXT *rmr_context
 )

rmr_handle lmr_triplet mem_privileges ep_handle user_cookie completion_flags rmr_context

The dat_rmr_bind() function binds the RMR to the specified memory region within an LMR and provides the new rmr_context value. The dat_rmr_bind() operation is a lightweight asynchronous operation that generates a new rmr_context. The Consumer is notified of the completion of this operation through a rmr_bind Completion event on the request_evd_handle of the specified Endpoint ep_handle.

The return value of rmr_context can be transferred by local Consumer to a Consumer on a remote host to be used for an RDMA DTO. The use of rmr_context by a remote host for an RDMA DTO prior to the completion of the dat_rmr_bind() can result in an error and a broken connection. The local Consumer can ensure that the remote Consumer does not have rmr_context before dat_rmr_bind() is completed. One way is to "wait" for the completion dat_rmr_bind() on the rmr_bind Event Dispatcher of the specified Endpoint ep_handle. Another way is to send rmr_context in a Send DTO over the connection of the Endpoint ep_handle. The barrier-fencing behavior of the dat_rmr_bind() with respect to Send and RDMA DTOs ensures that a Send DTO does not start until dat_rmr_bind() completed.

The dat_rmr_bind() function automatically fences all Send, RDMA Read, and RDMA Write DTOs and dat_rmr_bind() operations submitted on the Endpoint ep_handle after the dat_rmr_bind(). Therefore, none of these operations starts until dat_rmr_bind() is completed.

If the RMR Bind fails after dat_rmr_bind() returns, connection of ep_handle is broken. The Endpoint transitions into a DAT_EP_STATE_DISCONNECTED state and the DAT_CONNECTION_EVENT_BROKEN event is delivered to the connect_evd_handle of the Endpoint.

The dat_rmr_bind() function employs fencing to ensure that operations sending the RMR Context on the same Endpoint as the bind specified cannot result in an error from the peer side using the delivered RMR Context too soon. One method, used by InfiniBand, is to ensure that none of these operations start on the Endpoint until after the bind is completed. Other transports can employ different methods to achieve the same goal.

Any RDMA DTO that uses the previous value of rmr_context after the dat_rmr_bind() is completed fail and report a protection violation.

By default, dat_rmr_bind() generates notification completions.

The mem_privileges parameter allows Consumers to restrict the type of remote accesses to the registered RMR by RDMA DTOs. Providers whose underlying Transports require that privileges of the requested RMR and the associated LMR match, that is

or the operation fails and returns DAT_PRIVILEGES_VIOLATION.

In the lmr_triplet, the value of length of zero means that the Consumer does not want to associate an RMR with any memory region within the LMR and the return value of rmr_context for that case is undefined.

The completion of the posted RMR Bind is reported to the Consumer asynchronously through a DTO Completion event based on the specified completion_flags value. The value of DAT_COMPLETION_UNSIGNALLED_FLAG is only valid if the Endpoint Request Completion Flags DAT_COMPLETION_UNSIGNALLED_FLAG. Otherwise, DAT_INVALID_PARAMETER is returned.

The user_cookie parameter allows Consumers to have unique identifiers for each dat_rmr_bind(). These identifiers are completely under user control and are opaque to the Provider. The Consumer is not required to ensure the uniqueness of the user_cookie value. The user_cookie is returned to the Consumer in the rmr_bind Completion event for this operation.

The operation is valid for the Endpoint in the DAT_EP_STATE_CONNECTED and DAT_EP_STATE_DISCONNECTED states. If the operation returns successfully for the Endpoint in DAT_EP_STATE_DISCONNECTED state, the posted RMR Bind is immediately flushed to request_evd_handle.

DAT_SUCCESS DAT_INSUFFICIENT_RESOURCES DAT_INVALID_PARAMETER DAT_INVALID_HANDLE DAT_INVALID_STATE DAT_MODEL_NOT_SUPPORTED DAT_PRIVILEGES_VIOLATION DAT_PROTECTION_VIOLATION

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Standard: uDAPL, 1.1, 1.2

MT-Level Unsafe

libdat(3LIB), attributes(5)