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Date:   Fri, 9 Sep 2022 12:29:50 +0000
From:   Vladimir Oltean <>
To:     Daniel Machon <>
CC:     "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>
Subject: Re: [RFC PATCH net-next 2/2] net: dcb: add new apptrust attribute

Hi Daniel,

On Thu, Sep 08, 2022 at 02:04:42PM +0200, Daniel Machon wrote:
> Add a new apptrust extension attribute to the 8021Qaz APP managed
> object.
> The new attribute is meant to allow drivers, whose hw supports the
> notion of trust, to be able to set whether a particular app selector is
> to be trusted - and also the order of precedence of selectors.
> A new structure ieee_apptrust has been created, which contains an array
> of selectors, where lower indexes has higher precedence.
> Signed-off-by: Daniel Machon <>
> ---

Let's say I have a switch which only looks at VLAN PCP/DEI if the bridge
vlan_filtering setting is enabled (otherwise, the switch is completely
VLAN unaware, including for QoS purposes).

Would it be ok to report through ieee_getapptrust() that the PCP
selector is trusted when under a vlan_filtering bridge, not trusted when
not under a vlan_filtering bridge, and deny changes to ieee_setapptrust()
for the PCP selector? I see the return value is not cached anywhere
within the kernel, just passed to the user.

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