Peer-to-peer network communications using SATA/SAS technology
AssigneeAgere Systems Inc.
InventorsAli U. Ahmed, Gregory W. Sheets, Lane A. Smith, David W. Thompson
Life of this patent
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Abstract
A conventional serial communications protocol that is limited to supporting only host-to-slave communications, such as SATA or SAS, is extended to support peer-to-peer communications, e.g., by adding a memory-map layer into the conventional protocol stack between the link layer and the protocol layer. The addition of the memory-map layer enables two (or more) non-host devices (i.e., peer devices) to communicate with one another without using a host computer and without relying on conventional protocol-bridging techniques.
Claims9
A method for extending a conventional Serial Advanced Technology Attachment (SATA)/Serial Attached SCSI (SAS) protocol for a first hardware device, the method comprising:
- (a) providing the conventional SATA/SAS protocol having a conventional SATA/SAS protocol stack consisting of:
- (i) one or more lower-level stack layers;
- and
- (ii) one or more higher-level stack layers above the one or more lower-level stack layers, wherein configuring the first hardware device with the conventional SATA/SAS protocol would enable the first hardware device to be in a host-to-slave configuration with an other hardware device configured with the conventional SATA/SAS protocol;
- (b) adding, to the conventional SATA/SAS protocol stack of the conventional SATA/SAS protocol, a memory-map layer above the one or more lower-level stack layers and below the one or more higher-level stack layers to form a modified SATA/SAS protocol stack of a modified SATA/SAS protocol;
- and
- (c) configuring the first hardware device with the modified SATA/SAS protocol, such that, when the other hardware device is configured with the modified SATA/SAS protocol:
- the first hardware device is a peer in a peer-to-peer configuration via a link with the other hardwared device being another peer of the peer-to-peer configuration;
- the first hardware device supports peer-to-peer communication via the link with the other hardware device without using a protocol-bridging technique;
- and
- neither the first hardware device nor the other hardware device is a host device, wherein:
- the one or more lower-level stack layers comprise a physical medium device (PMD) layer and a link layer, whereby the memory-map layer is above the link layer;
- the one or more higher-level stack layers comprise a command/transport layer and an application layer;
- neither the first hardware device nor the other hardware device is a programmable device having an operating system that supports programmability beyond a fixed set of pre-defined functions for said hardware device;
- implementation of at least one component of the first hardware device that handles signal processing at one of the one or more higher-level stack layers is identical to implementation of a corresponding component of the other hardware device;
- the link is a serial link that functions as a bus;
- the first hardware device concurrently supports peer-to-peer communication via the link with one or more other hardware devices configured with the modified SATA/SAS protocol;
- each hardware device comprises a component for each lower-level stack layer, the memory-map layer, and each higher-level stack layer.
Dependencies are inferred from the claim text.