net: sysfs: add Documentation entries for basic set of attributes

Add sysfs attributes Documentation entries for the basic set of
attributes that are exposed by a network device in
/sys/class/net/<iface>/

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 b/Documentation/ABI/testing/sysfs-class-net
new file mode 100644 (file)
index 0000000..d922060
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-net
@@ -0,0 +1,199 @@
+What:          /sys/class/net/<iface>/addr_assign_type
+Date:          July 2010
+KernelVersion: 3.2
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the address assignment type. Possible values are:
+               0: permanent address
+               1: randomly generated
+               2: stolen from another device
+               3: set using dev_set_mac_address
+
+What:          /sys/class/net/<iface>/addr_len
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the hardware address size in bytes.
+               Values vary based on the lower-level protocol used by the
+               interface (Ethernet, FDDI, ATM, IEEE 802.15.4...). See
+               include/uapi/linux/if_*.h for actual values.
+
+What:          /sys/class/net/<iface>/address
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Hardware address currently assigned to this interface.
+               Format is a string, e.g: 00:11:22:33:44:55 for an Ethernet MAC
+               address.
+
+What:          /sys/class/net/<iface>/broadcast
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Hardware broadcast address for this interface. Format is a
+               string, e.g: ff:ff:ff:ff:ff:ff for an Ethernet broadcast MAC
+               address.
+
+What:          /sys/class/net/<iface>/carrier
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the current physical link state of the interface.
+               Posssible values are:
+               0: physical link is down
+               1: physical link is up
+
+               Note: some special devices, e.g: bonding and team drivers will
+               allow this attribute to be written to force a link state for
+               operating correctly and designating another fallback interface.
+
+What:          /sys/class/net/<iface>/dev_id
+Date:          April 2008
+KernelVersion: 2.6.26
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the device unique identifier. Format is an hexadecimal
+               value. This is used to disambiguate interfaces which might be
+               stacked (e.g: VLAN interfaces) but still have the same MAC
+               address as their parent device.
+
+What:          /sys/class/net/<iface>/dormant
+Date:          March 2006
+KernelVersion: 2.6.17
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates whether the interface is in dormant state. Possible
+               values are:
+               0: interface is not dormant
+               1: interface is dormant
+
+               This attribute can be used by supplicant software to signal that
+               the device is not usable unless some supplicant-based
+               authentication is performed (e.g: 802.1x). 'link_mode' attribute
+               will also reflect the dormant state.
+
+What:          /sys/clas/net/<iface>/duplex
+Date:          October 2009
+KernelVersion: 2.6.33
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface latest or current duplex value. Possible
+               values are:
+               half: half duplex
+               full: full duplex
+
+               Note: This attribute is only valid for interfaces that implement
+               the ethtool get_settings method (mostly Ethernet).
+
+What:          /sys/class/net/<iface>/flags
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface flags as a bitmask in hexadecimal. See
+               include/uapi/linux/if.h for a list of all possible values and
+               the flags semantics.
+
+What:          /sys/class/net/<iface>/ifalias
+Date:          September 2008
+KernelVersion: 2.6.28
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates/stores an interface alias name as a string. This can
+               be used for system management purposes.
+
+What:          /sys/class/net/<iface>/ifindex
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the system-wide interface unique index identifier as a
+               decimal number. This attribute is used for mapping an interface
+               identifier to an interface name. It is used throughout the
+               networking stack for specifying the interface specific
+               requests/events.
+
+What:          /sys/class/net/<iface>/iflink
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the system-wide interface unique index identifier a
+               the interface is linked to. Format is decimal. This attribute is
+               used to resolve interfaces chaining, linking and stacking.
+               Physical interfaces have the same 'ifindex' and 'iflink' values.
+
+What:          /sys/class/net/<iface>/link_mode
+Date:          March 2006
+KernelVersion: 2.6.17
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface link mode, as a decimal number. This
+               attribute should be used in conjunction with 'dormant' attribute
+               to determine the interface usability. Possible values:
+               0: default link mode
+               1: dormant link mode
+
+What:          /sys/class/net/<iface>/mtu
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface currently configured MTU value, in
+               bytes, and in decimal format. Specific values depends on the
+               lower-level interface protocol used. Ethernet devices will show
+               a 'mtu' attribute value of 1500 unless changed.
+
+What:          /sys/calss/net/<iface>/netdev_group
+Date:          January 2011
+KernelVersion: 2.6.39
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface network device group, as a decimal
+               integer. Default value is 0 which corresponds to the initial
+               network devices group. The group can be changed to affect
+               routing decisions (see: net/ipv4/fib_rules and
+               net/ipv6/fib6_rules.c).
+
+What:          /sys/class/net/<iface>/operstate
+Date:          March 2006
+KernelVersion: 2.6.17
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface RFC2863 operational state as a string.
+               Possible values are:
+               "unknown", "notpresent", "down", "lowerlayerdown", "testing",
+               "dormant", "up".
+
+What:          /sys/class/net/<iface>/speed
+Date:          October 2009
+KernelVersion: 2.6.33
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface latest or current speed value. Value is
+               an integer representing the link speed in Mbits/sec.
+
+               Note: this attribute is only valid for interfaces that implement
+               the ethtool get_settings method (mostly Ethernet ).
+
+What:          /sys/class/net/<iface>/tx_queue_len
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface transmit queue len in number of packets,
+               as an integer value. Value depend on the type of interface,
+               Ethernet network adapters have a default value of 1000 unless
+               configured otherwise
+
+What:          /sys/class/net/<iface>/type
+Date:          April 2005
+KernelVersion: 2.6.12
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the interface protocol type as a decimal value. See
+               include/uapi/linux/if_arp.h for all possible values.