net: sysfs: add documentation entries for /sys/class/<iface>/queues

Add sysfs documentation for the various attributes of a network
interface exposed in /sys/class/<iface>/queues/{rx,tx}-<queue>/

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/ABI/testing/sysfs-class-net-queues b/Documentation/ABI/testing/sysfs-class-net-queues
new file mode 100644 (file)
index 0000000..5e9aeb9
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-net-queues
@@ -0,0 +1,79 @@
+What:          /sys/class/<iface>/queues/rx-<queue>/rps_cpus
+Date:          March 2010
+KernelVersion: 2.6.35
+Contact:       netdev@vger.kernel.org
+Description:
+               Mask of the CPU(s) currently enabled to participate into the
+               Receive Packet Steering packet processing flow for this
+               network device queue. Possible values depend on the number
+               of available CPU(s) in the system.
+
+What:          /sys/class/<iface>/queues/rx-<queue>/rps_flow_cnt
+Date:          April 2010
+KernelVersion: 2.6.35
+Contact:       netdev@vger.kernel.org
+Description:
+               Number of Receive Packet Steering flows being currently
+               processed by this particular network device receive queue.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/tx_timeout
+Date:          November 2011
+KernelVersion: 3.3
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the number of transmit timeout events seen by this
+               network interface transmit queue.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/xps_cpus
+Date:          November 2010
+KernelVersion: 2.6.38
+Contact:       netdev@vger.kernel.org
+Description:
+               Mask of the CPU(s) currently enabled to participate into the
+               Transmit Packet Steering packet processing flow for this
+               network device transmit queue. Possible vaules depend on the
+               number of available CPU(s) in the system.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/byte_queue_limits/hold_time
+Date:          November 2011
+KernelVersion: 3.3
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the hold time in milliseconds to measure the slack
+               of this particular network device transmit queue.
+               Default value is 1000.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/byte_queue_limits/inflight
+Date:          November 2011
+KernelVersion: 3.3
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the number of bytes (objects) in flight on this
+               network device transmit queue.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/byte_queue_limits/limit
+Date:          November 2011
+KernelVersion: 3.3
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the current limit of bytes allowed to be queued
+               on this network device transmit queue. This value is clamped
+               to be within the bounds defined by limit_max and limit_min.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/byte_queue_limits/limit_max
+Date:          November 2011
+KernelVersion: 3.3
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the absolute maximum limit of bytes allowed to be
+               queued on this network device transmit queue. See
+               include/linux/dynamic_queue_limits.h for the default value.
+
+What:          /sys/class/<iface>/queues/tx-<queue>/byte_queue_limits/limit_min
+Date:          November 2011
+KernelVersion: 3.3
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the absolute minimum limit of bytes allowed to be
+               queued on this network device transmit queue. Default value is
+               0.