IWARP RDMA read extensions

摘要

Apparatus, method and system for supporting Remote Direct Memory Access (RDMA) Read V2 Request and Response messages using the Internet Wide Area RDMA Protocol (iWARP). iWARP logic in an RDMA Network Interface Controller (RNIC) is configured to generate a new RDMA Read V2 Request message and generate a new RDMA Read V2 Response message in response to a received RDMA Read V2 Request message, and send the messages to an RDMA remote peer using iWARP implemented over an Ethernet network. The iWARP logic is further configured to process RDMA Read V2 Response messages received from the RDMA remote peer, and to write data contained in the messages to appropriate locations using DMA transfers from buffers on the RNIC into system memory. In addition, the new semantics removes the need for extra operations to grant and revoke remote access rights.

主权项

1. An apparatus, comprising:
an Ethernet network interface, configured to send and receive packetized data over an Ethernet Network; and Internet Wide Area Remote Direct Memory Access (RDMA) Protocol (iWARP) logic, configured to facilitate operations when the apparatus is operating including generating an RDMA Read V2 Request message including an RDMA Read V2 Request header with a an RDMA message opcode identifying the message as an RDMA Read V2 Request message, wherein the apparatus is further configured, when operating, to operate as an RDMA local peer and to send the RDMA Read V2 Request message outbound from the Ethernet network interface to an RDMA remote peer, and wherein the RDMA Read V2 Request message is configured to be implemented with an RDMA Read V2 Response message in a manner that enables the apparatus to read data stored on the RDMA remote peer using RDMA semantics without granting remote access rights to the RDMA remote peer.