linux-kernel - Re: [PATCH v4 net 2/2] selftests: net: simple selftest for ipvtap

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Message-ID: <20260102122637.40556d72@kernel.org>
Date: Fri, 2 Jan 2026 12:26:37 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Dmitry Skorodumov <dskr99@...il.com>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...nel.org>,
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, Dmitry
 Skorodumov <skorodumov.dmitry@...wei.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v4 net 2/2] selftests: net: simple selftest for ipvtap

On Tue, 30 Dec 2025 17:03:24 +0300 Dmitry Skorodumov wrote:
> @@ -122,6 +123,7 @@ CONFIG_TEST_BPF=m
>  CONFIG_TLS=m
>  CONFIG_TRACEPOINTS=y
>  CONFIG_TUN=y
> +CONFIG_TAP=m

alphabetical order please

>  CONFIG_USER_NS=y
>  CONFIG_VETH=y
>  CONFIG_VLAN_8021Q=y
> diff --git a/tools/testing/selftests/net/ipvtap_test.sh b/tools/testing/selftests/net/ipvtap_test.sh
> new file mode 100755

> +NS_COUNT=32
> +IP_ITERATIONS=1024
> +[ "$KSFT_MACHINE_SLOW" = "yes" ] && NS_COUNT=8

This still fails on our slow VMs with debug kernel enabled (even tho
they set KSFT_MACHINE_SLOW). The test runs for 15+ minutes without
printing anything. That's pretty bad, humans running this tests will
also have no idea what's going on. Maybe limit the runtime of the test
as well as the iterations? To 1min? It takes <50sec on non-debug kernels
in our CI.
-- 
pw-bot: cr