System and method for infiniband receive flow control with...

Details System and method for infiniband receive flow control with... System and method for infiniband receive flow control with...

2004-03-29

2009-10-27

Pham, Chi H (Department: 2616)

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

C370S412000, C370S429000

Reexamination Certificate

active

07609636

ABSTRACT:
A system and method for implementing flow control, at the link and/or transport layers, for InfiniBand receive traffic. A shared memory structure may be used for combined queuing of virtual lane and queue pair traffic. Each virtual lane is allocated a number of memory buffers; a packet is dropped if buffering it would cause its virtual lane to exceed its allocation of buffers. For each active queue pair, a linked list of buffers is maintained in the structure. Each queue pair is dedicated zero or more of its virtual lane's buffers, and may also use a set of buffers shared among multiple queue pairs. Thresholds are established in a queue pair's dedicated set of buffers and/or the shared set of buffers. As each threshold number of buffers is used, a queue pair can advertise fewer message credits. RNR-NAKs are issued when no more buffers are available to a queue pair.

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