This is the update patch of PVUSB that includes some
enhancement and some bugfixes pointed out on this ML.
Main changes are followings:
- xenbus state flow changed.
Whole of the flow is changed to be like netback/netfront.
Reconfiguring/Reconfiguring are removed.
- New RING for hotplug notification added.
- USBIF_MAX_SEGMENTS_PER_REQUEST value is changed (10) to (16).
According to this change, RING_SIZE is decreased from 32 to 16.
This affects the performance. My flash drive''s read throughput
was dropped from 29MB/s to 18MB/s in the linux environment.
However, Windows guest send urb with 64kB buffer(64KB = 4kB * 16).
This is required.
- New port-setting interface
xenbus_watch_path2 is added to usbback, port-setting interface
is moved from sysfs to xenstore.
Now, the port-rule is directly written to xenstore entry.
Example.
# xenstore-write /local/domain/0/backend/vusb/1/0/port/1 “2-1”
(adding physical bus 2-1 to vusb-1-0 port 1)
- urb dequeue function completed.
usbfront send unlink-request to usbback, and can cancel the urb
that is submitted in the backend.
- New USB Spec version (USB1.1/USB2.0) selection support.
usbfront can act as both USB1.1 and USB2.0 virtual host controller
according to the xenstore entry key "usb-ver".
- experimental bus_suspend/bus_resume added to usbfront.
- various cleanups, bugfix, refactoring and codestyle-fix.
Attached files are xenstore reference and simple shell-script for
setting up and initializing the xenstore entries.
Current PVUSB has drivers only, but I''m now working on
xm integration and will post by this November.
Regards,
Noboru
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