Remote Direct Data Placement (rddp) ----------------------------------- Charter Last Modified: 2007-02-21 Current Status: Active Working Group Chair(s): David Black Transport Area Director(s): Magnus Westerlund Lars Eggert Transport Area Advisor: Lars Eggert Technical Advisor(s): Allyn Romanow Stephen Bailey Mailing Lists: General Discussion:rddp@ietf.org To Subscribe: rddp-request@ietf.org In Body: subscribe Archive: http://www.ietf.org/mail-archive/web/rddp/index.html Description of Working Group: The purpose of this WG is to enable Remote Direct Data Placement (rddp) capabilities with IP transport protocols, in particular with SCTP. RDDP capabilities refer to the ability to place data directly from the NIC into application buffers, without intensive CPU usage. This strategy avoids the costs of data copying and enables using IP as a method for high speed buffer to buffer transfer, allowing IP to replace special purpose networks currently in use. Remote Direct Memory Access (RDMA) is an example of this concept. Conceptually, RDDP functionality can be viewed as consisting of two layers. First the direct data placement capability, which is accomplished through a tag and a lookup table on the NIC. Above this core functionality, an RDDP control protocol is needed to specify how the direct data placement can be used, for example READ and WRITE commands. The work of the WG is to accomplish four items: 1) A (transport independent) protocol core to support direct data placement from the NIC into specified memory, usually application buffers. 2) A (transport independent) protocol core layered on top of the direct data placement protocol that specifies control of RDDP. 3) A mapping of the direct data placement protocol onto SCTP, for standards track, including a clear applicability statement of the expected service from the mapping. 4) A mapping of the direct data placement protocol onto TCP, for informational, because TCP's service is a less good match to RDDP, including an applicability statement of the issues regarding the service available from the mapping. The working group will ensure that the resulting technology will be secure and will not enable new attacks on systems supporting RDDP. The WG will not modify existing Internet transport protocols, but may forward issues it discovers in such transport protocols that are not full Internet Standards to the appropriate IETF WGs for their consideration. Goals and Milestones: Done Submit Internet-Draft including problem statement and architecture Done Submit Initial draft of Remote Direct Data Placement protocol (RDDP) Done Submit Initial draft of RDMA control protocol, to be named. Done Initial draft mapping the RDDP core and control onto SCTP including A/S Done Submit problem statement and architecture drafts to IESG for consideration as informational publications Done Initial draft of security considerations for RDDP Done Initial draft of informational mapping of the RDDP core and control onto TCP Done Initial draft of applicability statement covering both the SCTP and TCP mappings Done Submit RDMA control protocol (named TBD) to IESG for consideration as a Proposed Standard Done Submit Remote Data Placement Protocol (RDDP) to IESG for consideration as a Proposed Standard Done Submit RDDP security considerations draft to IESG Done Submit mapping of the RDDP core and RDMA control protocols onto SCTP to IESG for consideration as proposed standard Done Submit mapping of the RDDP core and RDMA control protocols onto TCP for consideration as an informational publication Done Submit applicability statement for RDDP core and RDMA control protocols over both SCTP and TCP for consideration as an informational publication Internet-Drafts: Posted Revised I-D Title ------ ------- -------------------------------------------- Feb 2003 Sep 2006 A Remote Direct Memory Access Protocol Specification Feb 2003 Sep 2006 Direct Data Placement over Reliable Transports Jun 2003 Jun 2006 Applicability of Remote Direct Memory Access Protocol (RDMA) and Direct Data Placement (DDP) Sep 2003 Sep 2006 Stream Control Transmission Protocol (SCTP) Direct Data Placement (DDP) Adaptation Oct 2003 Oct 2006 Marker PDU Aligned Framing for TCP Specification Oct 2003 Jun 2006 DDP/RDMAP Security Request For Comments: RFC Stat Published Title ------- -- ----------- ------------------------------------ RFC4297 I Dec 2005 Remote Direct Memory Access (RDMA) over IP Problem Statement RFC4296 I Dec 2005 The Architecture of Direct Data Placement (DDP)And Remote Direct Memory Access (RDMA)On Internet Protocols