HP 226824-001 - ProLiant - ML750 Wprowadzenie Podręcznik - Strona 8

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eliminate data copy operations, and significantly reduce communications overhead and latencies by

allowing one verbs consumer to place information directly in the memory of another verbs consumer,

while preserving operating system and memory protection semantics. Figure 4 is a conceptual model

of elements used in RNIC operation, including privileged mode consumers, non-privileged mode

consumers, RNIC components, and the RNIC interface.

Figure 4. Model for RNIC operation

Non-Privileged

Privileged

Application

Operating Environment Interface

Privileged Mode Agent

Non-Privileged Mode Agent

Kernel Agent

(RNIC Interface)

Kernel

Hardware

Interface

RNIC

Hardware

RNIC interface

The RNIC interface provides coordination between the consumer of RNIC services and the RNIC.

Verbs specify behavior of the RNIC and enable creation and management of queue pairs,

management of the RNIC, management of work requests, and transfer of error indications from the

RNIC interface.

A fundamental function of the RNIC interface is management of the RNIC. This includes arranging

access to the RNIC, accessing and modifying its attributes, and shutting it down.

The Queue Pair (QP) is a key component required for the operation of the RNIC interface. It is the

RNIC resource used by consumers to submit work requests to the RNIC interface. A queue pair is used

to interact with an RDMA stream on an RNIC. There may be thousands of queue pairs per RNIC.

Each queue pair provides the consumer with a single point of access to an individual RDMA stream.

A Queue Pair consists of a send queue and a receive queue. Sends, RDMA reads, RDMA writes, and

other operations are posted to send queues through work requests. Receive queues contain the buffer

information for arriving send messages. Work requests provide the mechanism for consumers to place

work queue elements onto the send and receive queues of a queue pair.

The Completion Queue (CQ) allows the consumer to retrieve work request completion status.

Notification mechanisms are provided to help a consumer identify when work requests have

completed processing in the RNIC interface. There may be thousands of completion queues per RNIC,

and they can be associated with the send queues and receive queues in any combination the

consumer requires.

Event handlers provide the mechanism for notifying consumers of asynchronous events that occur

within the RNIC interface but cannot be reported through the completion queues because they are

asynchronous or they are not easily associated with a work completion.