Larry O Wise

US Patent:

20050220128, Oct 6, 2005

Filed:

Aug 11, 2004

Appl. No.:

10/915940

Inventors:

Tom Tucker - Austin TX, US
Larry Wise - Austin TX, US

International Classification:

H04L012/56

US Classification:

370412000, 370463000

Abstract:

A system and method for work request queuing for an intelligent network interface card or adapter. More specifically, the invention provides a method and system that efficiently supports an extremely large number of work request queues. A virtual queue interface is presented to the host, and supported on the “back end” by a real queue shared among many multiple virtual queues. A message queue subsystem for an RDMA capable network interface includes a memory mapped virtual queue interface. The queue interface has a large plurality of virtual message queues with each virtual queue mapped to a specified range of memory address space. The subsystem includes logic to detect work requests on a host interface bus to at least one of specified address ranges corresponding to one of the virtual queues and logic to place the work requests into a real queue that is memory based and shared among at least some of the plurality of virtual queues, and wherein real queue entries include indications of the virtual queue to which the work request was addressed.

US Patent:

59599740, Sep 28, 1999

Filed:

Dec 2, 1996

Appl. No.:

8/755864

Inventors:

Daniel Edward Badt - Austin TX
David Richard Marquardt - Round Rock TX
Satyanarayana Billekal Rao - Austin TX
Lance Warren Russell - Fredericksburg TX
Larry Steven Wise - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G01R 3108

US Classification:

370233

Abstract:

A local system issues an ICMP echo request packet with a size based on an initial PMTU value corresponding to that of the local system's interface MTU. When an ICMP needfrag error packet is received by the local system, this signifies that the initial PMTU value was too large for packets of corresponding size to be transmitted through the Internet without fragmentation. The value is accordingly decreased by the local system and a next ICMP echo request packet transmitted through the Internet. The process iterates until an ICMP echo request packet is successfully transmitted through the Internet to a target system. In response thereto, the target system transmits an ICMP echo response packet back through the Internet to the local system, thereby indicating that the last-sent ICMP echo request packet from the local system had the correct PMTU value which is thereafter assumed to be the correct PMTU.

US Patent:

58127674, Sep 22, 1998

Filed:

Mar 12, 1997

Appl. No.:

8/815757

Inventors:

Saurabh Desai - Round Rock TX
Jessie Ann Hays Haug - Austin TX
Gregory Scott Joyce - Austin TX
Lance Warren Russell - Fredericksburg TX
Larry Steven Wise - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1300

US Classification:

3952008

Abstract:

An information handling system includes a number of stations connected in a network configuration, each station including a processor, a storage and an I/O controller, where the processor operates under control of an operating system control program which is divided into a user (application) space and a kernel (system) space, the kernel may include a protocol layer interfacing the user application to a DLPI in the kernel, a DLPI which interfaces between the protocol module and a device driver interface, a device driver and a hardware device for connecting the station to the network. When data is to be received by a station from the network, the following steps are performed in the DLPI: recognize the network interface type (FDDI, Ethernet, Token Ring, etc. ); recognize the protocol being used; format data according to the protocol; transmit to a Data Link Services user if address resolution is not required; if address resolution is required, test to determine if the protocol address resolution routine is registered; if registered, transmit data to the Data Link Services user; if not registered, call the default address resolution routine to resolve address and then transmit data to protocol module. When data is to be transmitted from a station to the network, the following steps are performed in the DLPI: recognize the network interface type (FDDI, Ethernet, Token Ring, etc.

US Patent:

58927530, Apr 6, 1999

Filed:

Dec 2, 1996

Appl. No.:

8/755867

Inventors:

Daniel Edward Badt - Austin TX
David Richard Marquardt - Round Rock TX
Satyanarayana Billekal Rao - Austin TX
Lance Warren Russell - Fredericksburg TX
Larry Steven Wise - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 1256

US Classification:

370233

Abstract:

A local system issues an ICMP echo request packet with a size based on an initial PMTU value corresponding to that of the local system's interface MTU. When an ICMP needfrag error packet is received by the local system, this signifies that the initial PMTU value was too large for packets of corresponding size to be transmitted through the Internet without fragmentation. The value is accordingly decreased by the local system and a next ICMP echo request packet transmitted through the Internet. The process iterates until an ICMP echo request packet is successfully transmitted through the Internet to a target system. In response thereto, the target system transmits an ICMP echo response packet back through the Internet to the local system, thereby indicating that the last-sent ICMP echo request packet from the local system had the correct PMTU value which is thereafter assumed to be the correct PMTU. An MTU application, MTU table, and corresponding application program interfaces and controls are provided in the system for dynamically maintaining PMTU value estimates and for providing next estimates of PMTU. These next estimates are accessed from the table in next ICMP echo request packet transmissions when an ICMP needfrag error packet does not contain an MTU value returned from a router in the Internet.