Cluster 2005

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RNIC-PI: The last step in standardizing RDMA

Ramesh VelurEunni

RAIT Workshop

IEEE International Conference on Cluster Computing (Cluster 2005)
Boston, Massachusetts, USA, September 26, 2005


Abstract

The hardware-software interaction forthe industry-standard Remote Direct Memory Access (RDMA) devices have only been defined as an abstract set of operations. While the abstract definition has allowed vendors to build RDMA adapters, the industry still lacks a genericsoftware interface definition that  hardware and system vendors can code to. This paperpresents the industry-standard RDMA NIC Programming Interface (RNIC-PI)and its flexiblearchitecture, the role it plays in the industry and the challengesencountered in reaching agreement on a common set of semantics that is acceptableto a variety of Operating Systems and RDMA NIC vendors.A vehicle to translate the interface into reality on Linux is described in the end along withsome suggestions on futurecourse of action.  

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