netdev - [PATCH net-next 11/16] selftests: mlxsw: qos_dscp_bridge: Disable IPv6 autogen on a bridge

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Message-ID: <0bb38b64a0e95bbd62f3cea0305491fe72d931c5.1687265905.git.petrm@nvidia.com>
Date: Tue, 20 Jun 2023 15:55:57 +0200
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Petr Machata <petrm@...dia.com>, Ido Schimmel <idosch@...dia.com>,
	Danielle Ratson <danieller@...dia.com>, Amit Cohen <amcohen@...dia.com>,
	Shuah Khan <shuah@...nel.org>, <linux-kselftest@...r.kernel.org>,
	<mlxsw@...dia.com>
Subject: [PATCH net-next 11/16] selftests: mlxsw: qos_dscp_bridge: Disable IPv6 autogen on a bridge

In a future patch, mlxsw will start adding RIFs to uppers of front panel
port netdevices, if they have an IP address.

At the time that the front panel port is enslaved to the bridge, the bridge
MAC address does not have the same prefix as other interfaces in the
system. On Nvidia Spectrum-1 machines all the RIFs have to have the same
38-bit MAC address prefix. Since the bridge does not obey this limitation,
the RIF cannot be created, and the enslavement attempt is vetoed on the
grounds of the configuration not being offloadable.

The selftest itself however checks DCB DSCP-based prioritization, and the
bridge serves for its L2 forwarding capabilities, and does not need to
participate in routing traffic. The IP address or the RIF are irrelevant.

Fix by disabling automatic IPv6 address generation for the HW-offloaded
bridge in this selftest, thus exempting it from mlxsw router attention.

Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Danielle Ratson <danieller@...dia.com>
---
 tools/testing/selftests/drivers/net/mlxsw/qos_dscp_bridge.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/drivers/net/mlxsw/qos_dscp_bridge.sh b/tools/testing/selftests/drivers/net/mlxsw/qos_dscp_bridge.sh
index 87c41f5727c9..914c63d6318a 100755
--- a/tools/testing/selftests/drivers/net/mlxsw/qos_dscp_bridge.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/qos_dscp_bridge.sh
@@ -65,6 +65,7 @@ h2_destroy()
 switch_create()
 {
 	ip link add name br1 type bridge vlan_filtering 1
+	ip link set dev br1 addrgenmode none
 	ip link set dev br1 up
 	ip link set dev $swp1 master br1
 	ip link set dev $swp1 up
-- 
2.40.1