RDMA completion and retransmit system and method

Details RDMA completion and retransmit system and method RDMA completion and retransmit system and method

2003-12-02

2009-06-02

Dollinger, Tonia L (Department: 2443)

Electrical computers and digital processing systems: multicomput

Computer-to-computer direct memory accessing

C709S216000, C710S036000, C370S412000, C370S428000

Reexamination Certificate

active

07543037

ABSTRACT:
A system and method for maintaining ordering in completion and retransmit operations in an RDMA environment. A system is provided for handling a completion process in an remote data memory access (RDMA) environment having a RequestOut channel and a ResponseOut channel, comprising: a descriptor list for each channel, wherein each descriptor list includes a message descriptor for each message in the channel; an update mechanism for updating a message length field in the message descriptor with a sequence number of a last byte in the message whenever a channel swap occurs between the RequestOut channel and the ResponseOut channel; an acknowledgement (Ack) completion system that examines values in a completion context and compares a sequence number of a next to complete message with a last acknowledged sequence number to determine if the message should be completed; and a read request completion system that performs completion of a read request.

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European Patent Office Communication Pursuant to Article 96(2) EPC, Sep. 11, 2007, 6 pages.

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