Implementing sleep lines in commodity ethernet hardware

• US 8,661,275 B2
• Filed: 10/01/2010
• Issued: 02/25/2014
• Est. Priority Date: 10/01/2010
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Zwisler, Ross E., McKean, Brian
• Primary Examiner(s): Lee, Thomas
• Assistant Examiner(s): CASSITY, ROBERT A
• Application Number:
  US12/896,241
• Publication Number:
  US 20120084590A1
• Time in Patent Office: 1,243 Days
• Field of Search: 713/323, 370/311
• US Class Current: 713/323
• CPC Class Codes: G06F 1/3209 Monitoring remote activity, e.g. over telephone lines or network connections
• CPC Class Codes: G06F 1/3278 Power saving in modem or I/O interface
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A first Network Interface Controller operates in a low power mode. The first Network Interface Controller transitions from low power mode to a power-up sequence if a sleep packet in not received from a second Network Interface Controller at the first Network Interface Controller within a predetermined time threshold.

Claims

1. A method for power management, comprising:

coordinating a first Network Interface Controller (NIC) to operate in a low power mode, coordinating the first NIC to operate in the low power mode includes receiving an instruction to operate in low power mode from a second NIC;

receiving a predetermined time threshold from the second NIC;

operating the first NIC in the low power mode;

starting a timer automatically in response to the first NIC operating in the low power mode, the timer being located internal to the first NIC or external to the first NIC;

transitioning the first NIC from the low power mode to a power-up sequence if a sleep packet is not received from the second NIC at the first NIC within the predetermined time threshold; and

resetting the timer if the sleep packet is received from the second NIC at the first NIC within the predetermined time threshold, wherein the first NIC operates within a first storage controller, wherein the transitioning the first NIC from the low power mode to the power-up sequence if the sleep packet is not received from the second NIC at the first NIC within the predetermined time threshold includes initiating a power-up sequence for the first storage controller.

2. The method of claim 1, wherein the operating the first NIC in the low power mode includes:

operating the first storage controller in a controller low power mode.

3. The method of claim 1, wherein the coordinating the first NIC to operate in the low power mode includes:

a first storage controller receiving a request from a second storage controller to operate in the low power mode.

4. The method of claim 1, wherein the coordinating the first NIC to operate in the low power mode includes:

the first storage controller notifying a second storage controller of the first storage controller operating in the low power mode.

5. A Network Interface Controller (NIC), comprising:

a memory for storing firmware configured to operate the NIC;

a bus communicatively coupled to the memory for data transfers within the NIC;

a processor communicatively coupled to the bus for executing the firmware;

a transceiver communicatively coupled to the bus for sending data from the NIC and receiving data to the NIC; and

an Ethernet port communicatively coupled to the bus for providing a physical data interface between the NIC and an Ethernet network,

wherein the firmware is configured to perform a method for power management of the NIC, the method comprising;

receiving a predetermined time threshold from a second NIC;

operating the NIC in a low power mode after receiving an instruction to operate in low power mode from the second NIC;

starting a timer automatically in response to the NIC operating in the low power mode, the timer being located internal to the NIC or external to the NIC,

transitioning the NIC from the low power mode to a power-up sequence if a sleep packet is not received from the second NIC at the NIC within the predetermined time threshold, and

resetting the timer if the sleep packet is received from the second NIC at the NIC within the predetermined time threshold, wherein the NIC operates within a storage controller, wherein the transitioning the NIC from the low power mode to the power-up sequence if the sleep packet is not received from the second NIC at the NIC within the predetermined time threshold includes initiating a power-up sequence for the storage controller.

6. The NIC of claim 5, wherein operating the NIC in a low power mode includes operating the storage controller in a low power mode.

7. A non-transitory computer-readable medium having computer-executable instructions for performing a method for power management, the method comprising:

coordinating a first Network Interface Controller (NIC) to operate in a low power mode, coordinating the first NIC to operate in the low power mode includes receiving an instruction to operate in low power mode from a second NIC;

receiving a predetermined time threshold from the second NIC;

operating the first NIC in the low power mode;

starting a timer automatically in response to the first NIC operating in the low power mode, the timer being located at least one of internal to the first NIC or external to the first NIC;

transitioning the first NIC from the low power mode to a power-up sequence if a sleep packet is not received from the second NIC at the first NIC within the predetermined time threshold; and

resetting the timer if the sleep packet is received from the second NIC at the first NIC within the predetermined time threshold, wherein the first NIC operates within a first storage controller, wherein the transitioning the first NIC from the low power mode to the power-up sequence if the sleep packet is not received from the second NIC at the first NIC within the predetermined time threshold includes initiating a power-up sequence for the first storage controller.

8. The non-transitory computer-readable medium of claim 7, wherein the coordinating the first NIC to operate in the low power mode includes:

the second NIC requesting the first NIC to operate in a low power mode.

9. The non-transitory computer-readable medium of claim 7, wherein the coordinating a first NIC to operate in a low power mode includes:

the first NIC notifying the second NIC of the first NIC operating in a low power mode.