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| author | Stephen Hemminger <stephen@networkplumber.org> | 2018-02-05 10:40:27 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-06 09:57:17 -0800 |
| commit | 37b96a4931dba07cebbf07092e55d1562155412b (patch) | |
| tree | 865b31a14739197399ccc79d62d9e5ad555dbca6 /Documentation | |
| parent | cf21be919c5960da2eb7bc91f8056adb27b56712 (diff) | |
| download | linux-stable-37b96a4931dba07cebbf07092e55d1562155412b.tar.gz linux-stable-37b96a4931dba07cebbf07092e55d1562155412b.tar.bz2 linux-stable-37b96a4931dba07cebbf07092e55d1562155412b.zip | |
uio_hv_generic: support sub-channels
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-bus-vmbus | 7 | ||||
| -rw-r--r-- | Documentation/driver-api/uio-howto.rst | 5 |
2 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-bus-vmbus b/Documentation/ABI/stable/sysfs-bus-vmbus index e46be65d0e1d..0c9d9dcd2151 100644 --- a/Documentation/ABI/stable/sysfs-bus-vmbus +++ b/Documentation/ABI/stable/sysfs-bus-vmbus @@ -132,3 +132,10 @@ KernelVersion: 4.16 Contact: Stephen Hemminger <sthemmin@microsoft.com> Description: Monitor bit associated with channel Users: Debugging tools and userspace drivers + +What: /sys/bus/vmbus/devices/vmbus_*/channels/NN/ring +Date: January. 2018 +KernelVersion: 4.16 +Contact: Stephen Hemminger <sthemmin@microsoft.com> +Description: Binary file created by uio_hv_generic for ring buffer +Users: Userspace drivers diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst index 693e3bd84e79..92056c20e070 100644 --- a/Documentation/driver-api/uio-howto.rst +++ b/Documentation/driver-api/uio-howto.rst @@ -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 =================== |