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+What: /sys/bus/fcoe/
+Date: August 2012
+KernelVersion: TBD
+Contact: Robert Love <robert.w.love@intel.com>, devel@open-fcoe.org
+Description: The FCoE bus. Attributes in this directory are control interfaces.
+
+Attributes:
+
+ ctlr_create:
+ 'FCoE Controller' instance creation interface. Writing an
+ <ifname> to this file will allocate and populate sysfs with a
+ fcoe_ctlr_device (ctlr_X). The user can then configure any
+ per-port settings and finally write to the fcoe_ctlr_device's
+ 'start' attribute to begin the kernel's discovery and login
+ process.
+
+ ctlr_destroy:
+ 'FCoE Controller' instance removal interface. Writing a
+ fcoe_ctlr_device's sysfs name to this file will log the
+ fcoe_ctlr_device out of the fabric or otherwise connected
+ FCoE devices. It will also free all kernel memory allocated
+ for this fcoe_ctlr_device and any structures associated
+ with it, this includes the scsi_host.
+
+What: /sys/bus/fcoe/devices/ctlr_X
+Date: March 2012
+KernelVersion: TBD
+Contact: Robert Love <robert.w.love@intel.com>, devel@open-fcoe.org
+Description: 'FCoE Controller' instances on the fcoe bus.
+ The FCoE Controller now has a three stage creation process.
+ 1) Write interface name to ctlr_create 2) Configure the FCoE
+ Controller (ctlr_X) 3) Enable the FCoE Controller to begin
+ discovery and login. The FCoE Controller is destroyed by
+ writing it's name, i.e. ctlr_X to the ctlr_delete file.
+
+Attributes:
+
+ fcf_dev_loss_tmo:
+ Device loss timeout period (see below). Changing
+ this value will change the dev_loss_tmo for all
+ FCFs discovered by this controller.
+
+ mode:
+ Display or change the FCoE Controller's mode. Possible
+ modes are 'Fabric' and 'VN2VN'. If a FCoE Controller
+ is started in 'Fabric' mode then FIP FCF discovery is
+ initiated and ultimately a fabric login is attempted.
+ If a FCoE Controller is started in 'VN2VN' mode then
+ FIP VN2VN discovery and login is performed. A FCoE
+ Controller only supports one mode at a time.
+
+ enabled:
+ Whether an FCoE controller is enabled or disabled.
+ 0 if disabled, 1 if enabled. Writing either 0 or 1
+ to this file will enable or disable the FCoE controller.
+
+ lesb/link_fail:
+ Link Error Status Block (LESB) link failure count.
+
+ lesb/vlink_fail:
+ Link Error Status Block (LESB) virtual link
+ failure count.
+
+ lesb/miss_fka:
+ Link Error Status Block (LESB) missed FCoE
+ Initialization Protocol (FIP) Keep-Alives (FKA).
+
+ lesb/symb_err:
+ Link Error Status Block (LESB) symbolic error count.
+
+ lesb/err_block:
+ Link Error Status Block (LESB) block error count.
+
+ lesb/fcs_error:
+ Link Error Status Block (LESB) Fibre Channel
+ Services error count.
+
+Notes: ctlr_X (global increment starting at 0)
+
+What: /sys/bus/fcoe/devices/fcf_X
+Date: March 2012
+KernelVersion: TBD
+Contact: Robert Love <robert.w.love@intel.com>, devel@open-fcoe.org
+Description: 'FCoE FCF' instances on the fcoe bus. A FCF is a Fibre Channel
+ Forwarder, which is a FCoE switch that can accept FCoE
+ (Ethernet) packets, unpack them, and forward the embedded
+ Fibre Channel frames into a FC fabric. It can also take
+ outbound FC frames and pack them in Ethernet packets to
+ be sent to their destination on the Ethernet segment.
+
+Attributes:
+
+ fabric_name:
+ Identifies the fabric that the FCF services.
+
+ switch_name:
+ Identifies the FCF.
+
+ priority:
+ The switch's priority amongst other FCFs on the same
+ fabric.
+
+ selected:
+ 1 indicates that the switch has been selected for use;
+ 0 indicates that the switch will not be used.
+
+ fc_map:
+ The Fibre Channel MAP
+
+ vfid:
+ The Virtual Fabric ID
+
+ mac:
+ The FCF's MAC address
+
+ fka_period:
+ The FIP Keep-Alive period
+
+ fabric_state: The internal kernel state
+
+ - "Unknown" - Initialization value
+ - "Disconnected" - No link to the FCF/fabric
+ - "Connected" - Host is connected to the FCF
+ - "Deleted" - FCF is being removed from the system
+
+ dev_loss_tmo: The device loss timeout period for this FCF.
+
+Notes: A device loss infrastructure similar to the FC Transport's
+ is present in fcoe_sysfs. It is nice to have so that a
+ link flapping adapter doesn't continually advance the count
+ used to identify the discovered FCF. FCFs will exist in a
+ "Disconnected" state until either the timer expires and the
+ FCF becomes "Deleted" or the FCF is rediscovered and becomes
+ "Connected."
+
+
+Users: The first user of this interface will be the fcoeadm application,
+ which is commonly packaged in the fcoe-utils package.