Network Working Group T. Dreibholz
Internet-Draft University of Duisburg-Essen
Intended status: Experimental R. Seggelmann
Expires: May 12, 2011 Muenster Univ. of Applied Sciences
M. Becke
University of Duisburg-Essen
November 8, 2010
Sender Queue Info Option for the SCTP Socket API
draft-dreibholz-tsvwg-sctpsocket-sqinfo-00.txt
Abstract
This document describes an extension to the SCTP sockets API for
querying information about the sender queue.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on May 12, 2011.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Sender Queue Info (SCTP_SQINFO) . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Introduction
This draft describes an extension to the SCTP sockets API (see
[I-D.ietf-tsvwg-sctpsocket], [RFC4960]) which allows an application
to query the sender queue utilization per stream. This information
is necessary for applications to make efficient use of a mapping of
streams to dissimilar paths. A detailed description including
simulation results can be found in [PFLDNeT2010].
In particular, this API extension is useful when using the CMT-SCTP
or CMT/RP-SCTP extension (see [I-D.tuexen-tsvwg-sctp-multipath],
[Globecom2010]) for Concurrent Multipath Transfer (CMT) with SCTP.
1.1. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
2. Sender Queue Info (SCTP_SQINFO)
This socket option obtains the maximum sender queue size (in bytes),
the current total sender queue utilization (in bytes) as well as the
current utilization per stream (in bytes).
The following structure is used to obtain the sender queue
information:
struct sctp_sndqueueinfo {
sctp_assoc_t sq_assoc_id;
uint32_t sq_queue_limit;
uint32_t sq_total_queued;
uint32_t sq_number_of_streams;
uint32_t sq_queued_on_stream[];
};
sq_assoc_id: This parameter is ignored for one-to-one style sockets.
For one-to-many style sockets this parameter indicates which
association the user is performing an action upon. It is an error
to use SCTP_{CURRENT|ALL}_ASSOC in sq_assoc_id.
sq_queue_limit: This field gives the maximum sender queue size in
bytes.
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sq_total_queued: This field gives the current total sender queue
utilization in bytes.
sq_number_of_streams: This field gives the number of outgoing
streams. That is, it will contain the number of valid
sq_queued_on_stream entries.
sq_queued_on_stream: This array gives the current number of bytes
queued for the streams 0 to sq_number_of_streams-1.
Note, that the caller of getsockopt() MUST provide a
sctp_sndqueueinfo structure which can hold at least as many
sq_queued_on_stream entries as the association's number of outgoing
streams. Otherwise, the getsockopt() call will fail and return an
error.
3. Security Considerations
Security considerations for the SCTP sockets API are described by
[I-D.ietf-tsvwg-sctpsocket].
4. IANA Considerations
This document does not require IANA actions.
5. Acknowledgments
The authors would like to thank Michael Tuexen and Irene Ruengeler
for their support.
6. References
6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4960] Stewart, R., "Stream Control Transmission Protocol",
RFC 4960, September 2007.
[I-D.ietf-tsvwg-sctpsocket]
Stewart, R., Poon, K., Tuexen, M., Yasevich, V., and P.
Lei, "Sockets API Extensions for Stream Control
Transmission Protocol (SCTP)",
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draft-ietf-tsvwg-sctpsocket-24 (work in progress),
October 2010.
[I-D.tuexen-tsvwg-sctp-multipath]
Becke, M., Dreibholz, T., Iyengar, J., Natarajan, P., and
M. Tuexen, "Load Sharing for the Stream Control
Transmission Protocol (SCTP)",
draft-tuexen-tsvwg-sctp-multipath-00 (work in progress),
July 2010.
6.2. Informative References
[PFLDNeT2010]
Dreibholz, T., Seggelmann, R., Tuexen, M., and E. Rathgeb,
"Transmission Scheduling Optimizations for Concurrent
Multipath Transfer", Proceedings of the 8th International
Workshop on Protocols for Future, Large-Scale and Diverse
Network Transports (PFLDNeT) , November 2010.
[Globecom2010]
Dreibholz, T., Becke, M., Rathgeb, E., and M. Tuexen, "On
the Use of Concurrent Multipath Transfer over Asymmetric
Paths", Proceedings of the IEEE Global Communications
Conference (GLOBECOM), December 2010.
Authors' Addresses
Thomas Dreibholz
University of Duisburg-Essen, Institute for Experimental Mathematics
Ellernstrasse 29
45326 Essen, Nordrhein-Westfalen
Germany
Phone: +49-201-1837637
Fax: +49-201-1837673
Email: dreibh@iem.uni-due.de
URI: http://www.iem.uni-due.de/~dreibh/
Robin Seggelmann
Muenster University of Applied Sciences
Stegerwaldstrasse 39
48565 Steinfurt, Nordrhein-Westfalen
Germany
Email: seggelmann@fh-muenster.de
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Martin Becke
University of Duisburg-Essen, Institute for Experimental Mathematics
Ellernstrasse 29
45326 Essen, Nordrhein-Westfalen
Germany
Phone: +49-201-183-7667
Fax: +49-201-183-7673
Email: martin.becke@uni-due.de
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