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linux-imx/Documentation/ABI/testing/sysfs-class-fc
Muneendra Kumar e9d73bfa8e scsi: documentation: Document Fibre Channel sysfs node for appid 
Update documentation for sysfs node within /sys/class/fc/fc_udev_device/.

Link: https://lore.kernel.org/r/20210913015853.2086512-1-muneendra.kumar@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Muneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2021-09-14 23:38:58 -04:00

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What: /sys/class/fc/fc_udev_device/appid_store Date: Aug 2021 Contact: Muneendra Kumar muneendra.kumar@broadconm.com Description: This interface allows an admin to set an FC application identifier in the blkcg associated with a cgroup id. The identifier is typically a UUID that is associated with an application or logical entity such as a virtual machine or container group. The application or logical entity utilizes a block device via the cgroup id. FC adapter drivers may query the identifier and tag FC traffic based on the identifier. FC host and FC fabric entities can utilize the application id and FC traffic tag to identify traffic sources.

	The interface expects a string "<cgroupid>:<appid>" where:
	<cgroupid> is inode of the cgroup in hexadecimal
	<appid> is user provided string upto 128 characters
	in length.

	If an appid_store is done for a cgroup id that already
	has an appid set, the new value will override the
	previous value.

	If an admin wants to remove an FC application identifier
	from a cgroup, an appid_store should be done with the
	following string: "<cgroupid>:"