Technologies for fast MAUSB enumeration

Patent metadata

Field	Value
Publication number	US-10528508-B2
Application number	US-201715857835-A
Country	US
Kind code	B2
Filing date	Dec 29, 2017
Priority date	Dec 29, 2017
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

Technologies for improving enumeration of universal serial bus (USB) devices over a media agnostic USB (MAUSB) connection are disclosed. In the illustrative embodiment, an MAUSB device may send USB configuration data to a host compute device. The host compute device may then perform a virtual enumeration of the USB devices based on the USB configuration data without necessarily communicating with the USB devices. The MAUSB device may perform an enumeration of the USB devices on behalf of the host compute devices without necessarily communicating with the host compute device. The USB devices may not be aware or have any indication that the USB device is not communicating with the host compute device during the enumeration process. Such an approach may improve the latency of USB enumeration over an MAUSB connection.

First claim

The invention claimed is:

1. A media agnostic universal serial bus (MAUSB) device for enumerating universal serial bus (USB) devices, the MAUSB device comprising:
an MAUSB session manager to establish an MAUSB session with a host compute device; and
a USB manager to:
send an indication of USB configuration data stored on the MAUSB device to the host compute device, wherein the USB configuration data includes information necessary to perform a virtual enumeration of one or more USB devices connected to the MAUSB device and wherein the USB configuration data is stored on the MAUSB device prior to establishment of the MAUSB session with the host compute device; and
enumerate, by the MAUSB device, the one or more USB devices connected to the MAUSB device.

2. The MAUSB device of claim 1 , wherein to send the indication of the USB configuration data to the host compute device comprises to send a hash of the USB configuration data to the host compute device.

3. The MAUSB device of claim 1 , wherein the USB manager is further to:
receive a read or write request for one of the one or more USB devices prior to completion of enumeration of the one of the one or more USB devices;
store the read or write request until completion of enumeration of the one of the one or more USB devices; and
process the read or write request after completion of enumeration of the one of the one or more USB devices.

4. The MAUSB device of claim 1 , wherein to enumerate the one or more USB devices comprises to send one or more commands to each of the one or more USB devices without receipt of corresponding commands from the host compute device.

5. The MAUSB device of claim 1 , wherein to send the indication of USB configuration data stored on the MAUSB device to the host compute device comprises to send the configuration data before initiation of enumeration of the one or more USB devices connected to the MAUSB device.

6. The MAUSB device of claim 1 , wherein the USB manager is further to:
determine, during enumeration of the one or more USB devices, that an additional USB device connected to the MAUSB device does not have an entry in the USB configuration data; and
notify the host compute device that the additional USB device does not have an entry in the USB configuration data.

7. The MAUSB device of claim 1 , wherein the USB manager is further to:
determine that an entry in the USB configuration data corresponds to a USB device that is not connected to the MAUSB device as of the time of establishment of the MAUSB session;
notify the host compute device that the entry corresponds to a USB device that is not connected to the MAUSB device; and
update the USB configuration data to remove the entry.

8. The MAUSB device of claim 1 , wherein to enumerate the one or more USB devices comprises to, for each of the one or more USB devices:
send a request for a device descriptor without receipt of a corresponding request for the device descriptor from the host compute device;
receive the device descriptor in response to the request for the device descriptor;
send a request for a configuration descriptor after receipt of the device descriptor and without receipt of a corresponding request for the configuration descriptor from the host compute device; and
receive the configuration descriptor in response to the request for the configuration descriptor,
wherein the USB configuration data includes, for each of the one or more USB devices, the corresponding device descriptor,
wherein to send the indication of the USB configuration data comprises to send the USB configuration data prior to receipt of the device descriptor from any of the one or more USB devices.

9. The MAUSB device of claim 1 , wherein to send the indication of the USB configuration data comprises to send the USB configuration data.

10. The MAUSB device of claim 1 , wherein to enumerate the one or more USB devices comprises to assign an address to each of the one or more USB devices without receipt of address assignments from the host compute device,
wherein the USB manager is further to send the assigned addresses of the one or more USB devices to the host compute device.

11. A host compute device for enumerating universal serial bus (USB) devices, the host compute device comprising:
an MAUSB session manager to establish a media agnostic USB (MAUSB) session with an MAUSB device; and
a USB manager to:
receive an indication of USB configuration data stored on the MAUSB device from the MAUSB device;
perform, based on the USB configuration data, a virtual enumeration of one or more USB devices connected to the MAUSB device;
receive USB device addresses of the one or more USB devices; and
update local USB device addresses for the one or more USB devices.

12. The host compute device of claim 11 ,
wherein the USB configuration data includes information necessary to perform a virtual enumeration of the one or more USB devices connected to the MAUSB device,
wherein the USB configuration data is stored on the MAUSB device prior to establishment of the MAUSB session with the MAUSB device,
wherein to receive the indication of the USB configuration data from the MAUSB device comprises to receive a hash of the USB configuration data from the MAUSB device.

13. The host compute device of claim 11 , wherein to perform the virtual enumeration of the one or more USB devices comprises to perform a virtual enumeration of the one or more USB devices without communication with the MAUSB device regarding the enumeration of the one or more USB devices.

14. The host compute device of claim 11 , wherein the USB manager is further to load device drivers for the one or more USB devices without communication with the MAUSB device regarding enumeration of the one or more USB devices.

15. The host compute device of claim 11 , wherein the USB manager is further to assign each of the one or more USB devices a corresponding initial USB device address as part of the virtual enumeration of the one or more USB devices,
wherein to update the local USB device addresses for the one or more USB devices comprises to update the local USB device addresses from the initial USB device addresses assigned as part of the virtual enumeration.

16. The host compute device of claim 11 , wherein the USB manager is further to send a read or write request for one of the one or more USB devices prior to receipt of an indication from the MAUSB device that enumeration of the one or more USB devices is complete.

17. One or more non-transitory computer-readable media comprising a plurality of instructions stored thereon that, when executed, causes a media agnostic universal serial bus (MAUSB) device to:
establish an MAUSB session with a host compute device; and
send an indication of universal serial bus (USB) configuration data stored on the MAUSB device to the host compute device, wherein the USB configuration data includes information necessary to perform a virtual enumeration of one or more USB devices connected to the MAUSB device and wherein the USB configuration data is stored on the MAUSB device prior to establishment of the MAUSB session with the host compute device; and
enumerate the one or more USB devices connected to the MAUSB device.

18. The one or more non-transitory computer-readable media of claim 17 , wherein to send the indication of the USB configuration data to the host compute device comprises to send a hash of the USB configuration data to the host compute device.

19. The one or more non-transitory computer-reada

Assignees

• Intel Ip Corp
• Intel Corp

Inventors

• Levy Elad
• Glik Michael
• Davidson Tal
• Cohn Daniel

Classifications

• G06F13/4282

  on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247) · CPC title

• G06F2213/0042

  Universal serial bus [USB] · CPC title

• G06F13/385 Primary

  for adaptation of a particular data processing system to different peripheral devices · CPC title

• G06F13/107

  Terminal emulation · CPC title