Remote Direct Data Placement (rddp)

Last Modified: 2007-02-21

Additional information is available at tools.ietf.org/wg/rddp

Chair(s):

Transport Area Director(s):

Transport Area Advisor:

Technical Advisor(s):

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

No Current Internet-Drafts

Request For Comments:

Remote Direct Memory Access (RDMA) over IP Problem Statement (RFC 4297) (48514 bytes)
The Architecture of Direct Data Placement (DDP)And Remote Direct Memory Access (RDMA)On Internet Protocols (RFC 4296) (43907 bytes)
A Remote Direct Memory Access Protocol Specification (RFC 5040) (142247 bytes)
Direct Data Placement over Reliable Transports (RFC 5041) (84642 bytes)
Applicability of Remote Direct Memory Access Protocol (RDMA) and Direct Data Placement (DDP) (RFC 5045) (51749 bytes)
Stream Control Transmission Protocol (SCTP) Direct Data Placement (DDP) Adaptation (RFC 5043) (38740 bytes)
Marker PDU Aligned Framing for TCP Specification (RFC 5044) (168918 bytes)
Direct Data Placement Protocol (DDP) / Remote Direct Memory Access Protocol (RDMAP) Security (RFC 5042) (127453 bytes)