Re: [PATCH net-next 0/3] selftests/xsk: stabilize timeout test behavior

[Maciej Fijalkowski <maciej.fijalkowski@intel.com>]

On Mon, Jun 22, 2026 at 04:07:06PM -0700, Jakub Kicinski wrote:
> On Wed, 17 Jun 2026 11:43:14 +0200 Maciej Fijalkowski wrote:
> > > On Tue, Jun 16, 2026 at 11:50 PM Tushar Vyavahare
> > > <tushar.vyavahare@intel.com> wrote:  
> > > >
> > > > This series improves AF_XDP selftests by making timeout handling
> > > > explicit and fixing sources of non-determinism in xsk timeout tests.
> > > >
> > > > Patch 1 introduces test_spec::poll_tmout and removes implicit
> > > > dependence on RX UMEM setup state for timeout behavior.
> > > >
> > > > Patch 2 fixes thread harness sequencing by attaching XDP programs
> > > > before worker startup, removing signal-based termination, and using
> > > > barrier synchronization only for dual-thread runs.
> > > >
> > > > Patch 3 restores shared_umem after POLL_TXQ_FULL so test-local
> > > > configuration does not leak into subsequent cases on shared-netdev
> > > > runs.
> > > >
> > > > Together these changes make timeout handling easier to follow and
> > > > improve selftest stability, especially on real NIC runs.  
> > > 
> > > net-next is closed, but in the meantime I'll review the series ASAP.
> > > 
> > > BTW, another thing about selftests I had in my mind is that are you
> > > planning to work on this [1]?  
> > 
> > This one is on me. I took your changes Jason and aligned ZC batching side
> > to this behavior, followed by xskxceiver adjustment. I am planning to send
> > this today EOD, however let's see how badly internal Sashiko will kick my
> > ass.
> 
> Hi Maciej, do you want these applied? If they help make the tests less
> flaky I think that it's fine to take them during the merge window.

Hi Jakub,

last refactor from Tushar broke BIDIRECTIONAL test case when HW is test
target, but not on veth, so let me test these changes locally and then get
back to you.

BPF CI runs xskxceiver on veth so this has not been caught. Seems my/our
focus should be to enable xskxceiver HW tests on any kind of
environment/infrastructure.

Gonna get back to you by the EOD.
Maciej