selftests: forwarding: hw_stats_l3: Set addrgenmode in a separate step

Setting the IPv6 address generation mode of a net device during its
creation never worked, but after commit b0ad3c1 ("rtnetlink: call
validate_linkmsg in rtnl_create_link") it explicitly fails [1]. The
failure is caused by the fact that validate_linkmsg() is called before
the net device is registered, when it still does not have an 'inet6_dev'.

Likewise, raising the net device before setting the address generation
mode is meaningless, because by the time the mode is set, the address
has already been generated.

Therefore, fix the test to first create the net device, then set its
IPv6 address generation mode and finally bring it up.

[1]
 # ip link add name mydev addrgenmode eui64 type dummy
 RTNETLINK answers: Address family not supported by protocol

Fixes: ba95e79 ("selftests: forwarding: hw_stats_l3: Add a new test")
Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/f3b05d85b2bc0c3d6168fe8f7207c6c8365703db.1686580046.git.petrm@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: daniellerts

tools/testing/selftests/net/forwarding/hw_stats_l3.sh

@@ -84,8 +84,9 @@ h2_destroy()
 
 router_rp1_200_create()
 {
-	ip link add name $rp1.200 up \
-		link $rp1 addrgenmode eui64 type vlan id 200
+	ip link add name $rp1.200 link $rp1 type vlan id 200
+	ip link set dev $rp1.200 addrgenmode eui64
+	ip link set dev $rp1.200 up
 	ip address add dev $rp1.200 192.0.2.2/28
 	ip address add dev $rp1.200 2001:db8:1::2/64
 	ip stats set dev $rp1.200 l3_stats on
@@ -256,9 +257,11 @@ reapply_config()
 
 	router_rp1_200_destroy
 
-	ip link add name $rp1.200 link $rp1 addrgenmode none type vlan id 200
+	ip link add name $rp1.200 link $rp1 type vlan id 200
+	ip link set dev $rp1.200 addrgenmode none
 	ip stats set dev $rp1.200 l3_stats on
-	ip link set dev $rp1.200 up addrgenmode eui64
+	ip link set dev $rp1.200 addrgenmode eui64
+	ip link set dev $rp1.200 up
 	ip address add dev $rp1.200 192.0.2.2/28
 	ip address add dev $rp1.200 2001:db8:1::2/64
 }