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uio_hv_generic: support sub-channels

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Use sysfs to allow supporting sub-channels. The userspace application
makes request to host to create sub-channels and the UIO kernel
driver populates the sysfs per-channel directory with a binary
attribute file that can be used to read/write ring.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger
2018-02-05 10:40:27 -08:00
committed by Greg Kroah-Hartman
parent cf21be919c
commit 37b96a4931
3 changed files with 101 additions and 0 deletions
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5
Documentation/driver-api/uio-howto.rst
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@@ -709,6 +709,11 @@ The vmbus device regions are mapped into uio device resources:
3) Network receive buffer region
4) Network send buffer region
If a subchannel is created by a request to host, then the uio_hv_generic
device driver will create a sysfs binary file for the per-channel ring buffer.
For example:
/sys/bus/vmbus/devices/3811fe4d-0fa0-4b62-981a-74fc1084c757/channels/21/ring
Further information
===================