1 What: /sys/class/fc/fc_udev_device/a 1 What: /sys/class/fc/fc_udev_device/appid_store
2 Date: Aug 2021 2 Date: Aug 2021
3 Contact: Muneendra Kumar <muneendra.kuma 3 Contact: Muneendra Kumar <muneendra.kumar@broadconm.com>
4 Description: 4 Description:
5 This interface allows an admin 5 This interface allows an admin to set an FC application
6 identifier in the blkcg associ 6 identifier in the blkcg associated with a cgroup id. The
7 identifier is typically a UUID 7 identifier is typically a UUID that is associated with
8 an application or logical enti 8 an application or logical entity such as a virtual
9 machine or container group. Th 9 machine or container group. The application or logical
10 entity utilizes a block device 10 entity utilizes a block device via the cgroup id.
11 FC adapter drivers may query t 11 FC adapter drivers may query the identifier and tag FC
12 traffic based on the identifie 12 traffic based on the identifier. FC host and FC fabric
13 entities can utilize the appli 13 entities can utilize the application id and FC traffic
14 tag to identify traffic source 14 tag to identify traffic sources.
15 15
16 The interface expects a string 16 The interface expects a string "<cgroupid>:<appid>" where:
17 <cgroupid> is inode of the cgr 17 <cgroupid> is inode of the cgroup in hexadecimal
18 <appid> is user provided strin 18 <appid> is user provided string upto 128 characters
19 in length. 19 in length.
20 20
21 If an appid_store is done for 21 If an appid_store is done for a cgroup id that already
22 has an appid set, the new valu 22 has an appid set, the new value will override the
23 previous value. 23 previous value.
24 24
25 If an admin wants to remove an 25 If an admin wants to remove an FC application identifier
26 from a cgroup, an appid_store 26 from a cgroup, an appid_store should be done with the
27 following string: "<cgroupid>: 27 following string: "<cgroupid>:"
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