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Fri, 9 Oct 2026 07:00:04 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Fri, 09 Oct 2026 13:59:43 +0300 From: "Alice Mikityanska" To: "Haishuang Yan" , netdev@vger.kernel.org Cc: "Matthieu Baerts" , "David S. Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "Simon Horman" , "Shuah Khan" , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Message-Id: In-Reply-To: <20261007014731.1277055-1-yanhaishuang@cmss.chinamobile.com> References: <20261007014731.1277055-1-yanhaishuang@cmss.chinamobile.com> Subject: Re: [PATCH net] selftests: net: big_tcp_tunnels: Fix the IPv6 route change Content-Type: text/plain Content-Transfer-Encoding: 7bit On Wed, Oct 7, 2026, at 04:47, Haishuang Yan wrote: > On slow machines, do_test() raises initcwnd on the route into the tunnel > with "ip route change". For IPv6 traffic this fails with: > > RTNETLINK answers: No such file or directory Thanks for the fix! It's already merged, but anyway: Tested-by: Alice Mikityanska > The IPv6 prefix route of the tunnel address has metric 256, while > "ip -6 route change" without a metric looks for a route with the default > metric 1024, so nothing is changed. The test still passes, but without > the larger initcwnd it is meant to use. > > Pass the metric of the prefix route. > > Fixes: 1d62b83fb751 ("selftests: net: Fix slow configurations in > big_tcp_tunnels.sh") > Signed-off-by: Haishuang Yan > --- > tools/testing/selftests/net/big_tcp_tunnels.sh | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/net/big_tcp_tunnels.sh > b/tools/testing/selftests/net/big_tcp_tunnels.sh > index cc0875e52fb9..fb43fed824e3 100755 > --- a/tools/testing/selftests/net/big_tcp_tunnels.sh > +++ b/tools/testing/selftests/net/big_tcp_tunnels.sh > @@ -145,7 +145,8 @@ do_test() { > route change 192.168.2.0/24 dev tun0 initcwnd 100 > else > ip -netns "$CLIENT_NS" -6 \ > - route change 2001:db8::2:0/112 dev tun0 initcwnd 100 > + route change 2001:db8::2:0/112 dev tun0 initcwnd 100 \ > + metric 256 > fi > else > ip netns exec "$CLIENT_NS" \ > -- > 2.43.0