dcb
[ OPTIONS ]
apptrust
{ COMMAND | help }
dcb apptrust show dev
DEV
[ order ]
dcb apptrust set dev
DEV
[ order
SEL-LIST ]
SEL-LIST := [ SEL-LIST ] SEL
SEL := { ethtype | stream-port | dgram-port | port | dscp | pcp }
dcb apptrust is used to configure per-selector trust and trust order of the Application Priority Table, see dcb-app(8) for details on how to configure app table entries.
Selector trust can be used by the software stack, or drivers (most likely the latter), when querying the APP table, to determine if an APP entry should take effect, or not. Additionally, the order of the trusted selectors will dictate which selector should take precedence, in the case of multiple different APP table selectors being present.
The following describes only the write direction, i.e. as used with the set command. For the show command, the parameter name is to be used as a simple keyword without further arguments. This instructs the tool to show the values of a given parameter.
Set trust order to: dscp, pcp for eth0:
# dcb apptrust set dev eth0 order dscp pcp
Set trust order to: port (stream or dgram), pcp, ethtype for eth1:
# dcb apptrust set dev eth1 order port pcp ethtype
Show what was set:
# dcb apptrust show dev eth0
order: port pcp ethtype