Shared physical memory protocol

Patent metadata

Field	Value
Publication number	US-9417996-B2
Application number	US-201313790039-A
Country	US
Kind code	B2
Filing date	Mar 8, 2013
Priority date	Jun 12, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A computer implemented method for receiving data to a targeted logical partition. A computer locates buffer element in reliance on a connection status bit array. The computer copies control information to the targeted logical partition's local storage. The computer updates a targeted logical partition's local producer cursor based on the control information. The computer copies data to an application receive buffer. The computer determines that an application completes a receive operation. Responsive to a determination that the application completed the receive operation, the computer a targeted logical partition's local consumer cursor to match the targeted logical partition's producer cursor.

First claim

What is claimed is:

1. A computer implemented method for receiving data to a targeted logical partition, the computer implemented method comprising:
receiving an interrupt;
responsive to receiving the interrupt, locating a buffer that has pending work in reliance on a connection status bit array, wherein the connection status bit array indicates, using a single bit, a buffer element that has data waiting among a plurality of shared memory buffer elements, wherein the buffer is one selected from the group consisting of a shared memory buffer (SMB) and a remote memory buffer (RMB) and the buffer element is one selected from the group consisting of shared memory buffer element (SMBE) and remote memory buffer element (RMBE);
determining that an application completes a receive operation;
copying control information to a local storage of the targeted logical partition's local storage, wherein the local storage is the buffer element;
responsive to a determination that the application completed the receive operation, updating a targeted logical partition's local consumer cursor to match the targeted logical partition's producer cursor;
copying data from a remote memory buffer element responsive to a determination that the application has not completed the receive operation; and
posting socket receive complete.

2. The computer implemented method of claim 1 , wherein the determining that data is available is based on the targeted logical partition's local producer cursor.

3. The computer implemented method of claim 2 , wherein locating the buffer that has pending work comprises locating a shared memory buffer element.

4. The computer implemented method of claim 1 , further comprising:
determining that the application issued the receive operation, wherein locating the buffer that has pending work is responsive to a determination that the application issued the receive operation.

Assignees

• IBM

Inventors

• Fitzpatrick Michael G
• Fox Michael J
• Isrel Maurice
• Kassimis Constantinos
• Schmidt Donald W
• Segal Benjamin
• Stevens Jerry W
• Valler Todd E

Classifications

• G06F12/00 Primary

  Accessing, addressing or allocating within memory systems or architectures (digital input from, or digital output to record carriers, e.g. to disk storage units, G06F3/06) · CPC title

• G06F9/544 Primary

  Buffers; Shared memory; Pipes · CPC title

• G06F3/065

  Replication mechanisms · CPC title