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Date:   Fri, 23 Sep 2022 11:10:15 +0000
To:     Patrick Rohr <>
Subject: Re: [PATCH v2] tun: support not enabling carrier in TUNSETIFF


This patch was applied to netdev/net.git (master)
by David S. Miller <>:

On Tue, 20 Sep 2022 12:48:25 -0700 you wrote:
> This change adds support for not enabling carrier during TUNSETIFF
> interface creation by specifying the IFF_NO_CARRIER flag.
> Our tests make heavy use of tun interfaces. In some scenarios, the test
> process creates the interface but another process brings it up after the
> interface is discovered via netlink notification. In that case, it is
> not possible to create a tun/tap interface with carrier off without it
> racing against the bring up. Immediately setting carrier off via
> TUNSETCARRIER is still too late.
> [...]

Here is the summary with links:
  - [v2] tun: support not enabling carrier in TUNSETIFF

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