公开(公告)号：EP1609063A4

公开(公告)日：2009-03-11

申请号：EP03816813

申请日：2003-07-21

Applicant: IBM

Inventor： FREIMUTH DOUGLAS ,  MRAZ RONALD ,  NAHUM ERICH ,  PRADHAN PRASHANT ,  SAHU SAMBIT ,  TRACEY JOHN

IPC: G06F11/00 ,  H04B1/74 ,  H04L29/06 ,  H04L29/14

CPC classification number: H04L69/16 ,  H04B1/74 ,  H04L1/1809 ,  H04L1/1835 ,  H04L1/1874 ,  H04L69/12 ,  H04L69/161 ,  H04L69/163 ,  H04L69/40

Abstract: The present invention provides a method, computer program product, and data processing system for efficiently recovering state and performing failover of a network offload engine (904). The present invention distinguishes between the hard state and the soft state of a protocol. Hard state is state information that, when lost, leads to incorrect protocol behavior. Soft state is state information that may be lost or become inconsistent without loss of correctness. The present invention ensures correctness by always being able to recover (1002) the hard state of the protocol. A preferred embodiment of the present invention performs a failover of a network offload engine (904) by temporarily blocking (908) the reception of network packets, recovering (1002) hard state from host information, resuming network operation using a substitute network offload engine (906), and recovering (1008) soft state from the subsequent network activity.

公开(公告)号：AU2003259192A1

公开(公告)日：2004-11-23

申请号：AU2003259192

申请日：2003-07-21

Applicant: IBM

Inventor： TRACEY JOHN ,  FREIMUTH DOUGLAS ,  MRAZ RONALD ,  NAHUM ERICH ,  PRADHAN PRASHANT ,  SAHU SAMBIT

IPC: H04B1/74 ,  H04L69/40 ,  G06F11/00

Abstract: The present invention provides a method, computer program product, and data processing system for efficiently recovering state and performing failover of a network offload engine. The present invention distinguishes between the hard state and the soft state of a protocol. Hard state is state information that, when lost, leads to incorrect protocol behavior. Soft state is state information that may be lost or become inconsistent without loss of correctness. The present invention ensures correctness by always being able to recover the hard state of the protocol. A preferred embodiment of the present invention performs a failover of a network offload engine by temporarily blocking the reception of network packets, recovering hard state from host information, resuming network operation using a substitute network offload engine, and recovering soft state from the subsequent network activity.

公开(公告)号：AT522865T

公开(公告)日：2011-09-15

申请号：AT03816813

申请日：2003-07-21

Applicant: IBM

Inventor： FREIMUTH DOUGLAS ,  MRAZ RONALD ,  NAHUM ERICH ,  PRADHAN PRASHANT ,  SAHU SAMBIT ,  TRACEY JOHN

IPC: G06F11/00 ,  H04B1/74 ,  H04L69/40

Abstract: The present invention provides a method, computer program product, and data processing system for efficiently recovering state and performing failover of a network offload engine. The present invention distinguishes between the hard state and the soft state of a protocol. Hard state is state information that, when lost, leads to incorrect protocol behavior. Soft state is state information that may be lost or become inconsistent without loss of correctness. The present invention ensures correctness by always being able to recover the hard state of the protocol. A preferred embodiment of the present invention performs a failover of a network offload engine by temporarily blocking the reception of network packets, recovering hard state from host information, resuming network operation using a substitute network offload engine, and recovering soft state from the subsequent network activity.

公开(公告)号：AT424583T

公开(公告)日：2009-03-15

申请号：AT05754067

申请日：2005-05-23

Applicant: IBM

Inventor： FREIMUTH DOUGLAS ,  HU ELBERTB ,  MRAZ RONALD ,  NAHUM ERICH ,  PRADHAN PRASHANT ,  SAHU SAMBIT ,  TRACEY JOHN M

IPC: G06F13/30 ,  G06F13/28

Abstract: A number of improvements in network adapters that offload protocol processing from the host processor are provided. Specifically, mechanisms for handling memory management and optimization within a system utilizing an offload network adapter are provided. The memory management mechanism permits both buffered sending and receiving of data as well as zero-copy sending and receiving of data. In addition, the memory management mechanism permits grouping of DMA buffers that can be shared among specified connections based on any number of attributes. The memory management mechanism further permits partial send and receive buffer operation, delaying of DMA requests so that they may be communicated to the host system in bulk, and expedited transfer of data to the host system.