Re: [PATCH net v3] tun/tap & vhost-net: make qdisc backpressure opt-in via IFF_BACKPRESSURE

Oliver Sang <[email protected]> Thu, 16 Jul 2026 09:22:35 +0800

Newsgroups	dev.linux.lists.oe-lkp,it.linux.lists.ltp,org.kernel.vger.linux-doc,org.kernel.vger.linux-kernel,org.kernel.vger.netdev
Message-ID	<algyW7c79Vl1Ilq2@xsang-OptiPlex-9020>

hi, Simon Schippers,

On Wed, Jul 15, 2026 at 04:32:26PM +0200, Simon Schippers wrote:
> On 7/15/26 16:01, kernel test robot wrote:
> > 
> > 
> > Hello,
> > 
> > kernel test robot noticed "ltp.ioctl03.fail" on:
> 
> ioctl03.c does not know about IFF_BACKPRESSURE which is introduced here,
> consequently it fails.
> See [1] where it compares TUN features with known_flags.

thanks a lot for information!

> 
> Thanks.
> 
> [1] Link: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/ioctl/ioctl03.c#L82
> 

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