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xen-devel
[Xen-devel] [PATCH 0/3] PVUSB update and bugfix
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
PVUSB XenStore Reference
Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
5th Oct 2009
/local/domain/<domid>
backend/
vusb/ - a directory containing vusb backends
<domid>/ - a directory vusb's for domid
<id>/ - a directory for each virtual
host controller
frontend-id - the domain id of the
frontend
frontend - the path to the
frontend domain
usb-ver - USB Spec version (1 = USB1.1,
2 = USB2.0)
num-ports - number of root ports
(max. 16)
port/
1 - physical usb port
path the virtual port is attached to
...
16
state - communication state
across XenBus to the frontend.
device/
vusb/ - a directory containing the virtual hcd
<id>/ - a directory containing the
virtual hcd id for the domain
backend-id - the domain id of the
backend
backend - the path to the backend domain
urb-ring-ref - the grant table
reference for the urb request ring queue
conn-ring-ref - the grant table
reference for the connection request ring queue
event-channel - the event channel
used for the usb request ring queue
state - communication state
across XenBus to the backend.
#!/bin/sh
#
# Setup XenStore entry for paravirtualized USB driver.
#
# Written by Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
#
XSWRITE=/usr/bin/xenstore-write
XSCHMOD=/usr/bin/xenstore-chmod
DEV_NAME=vusb
# Max 16 ports.
NUM_PORTS=8
usage () {
echo "Usage: `basename $0` <frontend-id> <device-id>"
echo " <frontend-id>: the domain id of frontend"
echo " <device-id>: the device id of frontend"
echo ""
echo "Example:"
echo " If you use paravirtual USB driver on Domain ID 1,"
echo " simply do"
echo " `basename $0` 1 0"
exit 1
}
[ $# -eq 2 ] || usage
DEV_ID=$2
# Write backend information into the location that frontend look for.
$XSWRITE /local/domain/$1/device/$DEV_NAME/$DEV_ID/backend-id 0
$XSWRITE /local/domain/$1/device/$DEV_NAME/$DEV_ID/backend \
/local/domain/0/backend/$DEV_NAME/$1/$DEV_ID
# Write frontend information into the location that backend look for.
$XSWRITE /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/frontend-id $1
$XSWRITE /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/frontend \
/local/domain/$1/device/$DEV_NAME/$DEV_ID
# Write USB Spec version field.
$XSWRITE /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/usb-ver 2
# Write virtual root hub field.
$XSWRITE /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/num-ports $NUM_PORTS
for i in $(seq 1 $NUM_PORTS)
do
# Set all port to disconnected state
$XSWRITE /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/port/$i ""
done
# Set permission
$XSCHMOD /local/domain/$1/device/$DEV_NAME/$DEV_ID n$1 r0
$XSCHMOD /local/domain/$1/device/$DEV_NAME/$DEV_ID/backend-id n$1 r0
$XSCHMOD /local/domain/$1/device/$DEV_NAME/$DEV_ID/backend n$1 r0
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID n0 r$1
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/frontend-id n0 r$1
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/frontend n0 r$1
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/usb-ver n0 r$1
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/num-ports n0 r$1
for i in $(seq 1 $NUM_PORTS)
do
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/port/$i n0 r0
done
# Set state to XenbusStateInitialising
$XSWRITE /local/domain/$1/device/$DEV_NAME/$DEV_ID/state 1
$XSCHMOD /local/domain/$1/device/$DEV_NAME/$DEV_ID/state n$1 r0
$XSWRITE /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/state 1
$XSCHMOD /local/domain/0/backend/$DEV_NAME/$1/$DEV_ID/state n0 r$1
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