Remote Direct Data Placement (rddp)
-----------------------------------

Charter
Last Modified: 2006-03-24

Current Status: Active Working Group

Chair(s):
    David Black  <[email protected]>

Transport Area Director(s):
    Magnus Westerlund  <[email protected]>
    Lars Eggert  <[email protected]>

Transport Area Advisor:
    Lars Eggert  <[email protected]>

Technical Advisor(s):
    Allyn Romanow  <[email protected]>
    Stephen Bailey  <[email protected]>

Mailing Lists:
    General Discussion:[email protected]
    To Subscribe:      [email protected]
        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

  Oct 2005       Consult Area Directors about any additional work the WG should
               undertake


Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Feb 2003 Sep 2006   <draft-ietf-rddp-rdmap-07.txt>
               A Remote Direct Memory Access Protocol Specification

Feb 2003 Jun 2006   <draft-ietf-rddp-ddp-06.txt>
               Direct Data Placement over Reliable Transports

Jun 2003 Jun 2006   <draft-ietf-rddp-applicability-08.txt>
               Applicability of Remote Direct Memory Access Protocol (RDMA)
               and Direct Data Placement (DDP)

Sep 2003 Sep 2006   <draft-ietf-rddp-sctp-07.txt>
               Stream Control Transmission Protocol (SCTP) Direct Data
               Placement (DDP) Adaptation

Oct 2003 Sep 2006   <draft-ietf-rddp-mpa-06.txt>
               Marker PDU Aligned Framing for TCP Specification

Oct 2003 Jun 2006   <draft-ietf-rddp-security-10.txt>
               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