linux-kernel - Re: [PATCH net v7 4/4] selftest: netcons: add test for netconsole over bonded interfaces

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Message-ID: <3aozzslkx7jpiabyvey3562i57ogqkw2wb4xfp7uazidj572p6@jg6lw5dzxxto>
Date: Mon, 13 Oct 2025 11:11:00 -0700
From: Breno Leitao <leitao@...ian.org>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Shuah Khan <shuah@...nel.org>, Simon Horman <horms@...nel.org>, 
	david decotigny <decot@...glers.com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, asantostc@...il.com, efault@....de, calvin@...nvd.org, 
	kernel-team@...a.com, jv@...sburgh.net
Subject: Re: [PATCH net v7 4/4] selftest: netcons: add test for netconsole
 over bonded interfaces

On Tue, Oct 07, 2025 at 11:47:22AM +0200, Paolo Abeni wrote:
> On 10/3/25 1:57 PM, Breno Leitao wrote:
> > +# Clean up netdevsim ifaces created for bonding test
> > +function cleanup_bond_nsim() {
> > +	echo "$NSIM_BOND_TX_1" > "$NSIM_DEV_SYS_DEL"
> > +	echo "$NSIM_BOND_TX_2" > "$NSIM_DEV_SYS_DEL"
> > +	echo "$NSIM_BOND_RX_1" > "$NSIM_DEV_SYS_DEL"
> > +	echo "$NSIM_BOND_RX_2" > "$NSIM_DEV_SYS_DEL"
> > +	cleanup_all_ns
> 
> If all devices are created in child netns, you will not need explicit
> per device cleanup.

Humm, that is what I was expecting as well, but, when I tried it, I found that
the interfaces got re-pareted by the main network namespace when the namespace
is deleted.


For instance, in the following example, eth1 belongs to namespace `ns1`, and
when I delete it, it then moves to the main network namespace:

	# ip link

	# ip -n ns1 link
	3: eth1: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
	link/ether d2:3d:b3:3b:59:37 brd ff:ff:ff:ff:ff:ff
	altname eni1np1

	# ip netns delete ns1

	# ip link
	1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
	link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
	3: eth1: <BROADCAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
	link/ether d2:3d:b3:3b:59:37 brd ff:ff:ff:ff:ff:ff
	altname eni1np1