From e1b9efe6baebe79019a2183176686a0e709388ae Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 10 Sep 2020 14:01:26 +0300 Subject: [PATCH 1/2] net: Fix bridge enslavement failure When a netdev is enslaved to a bridge, its parent identifier is queried. This is done so that packets that were already forwarded in hardware will not be forwarded again by the bridge device between netdevs belonging to the same hardware instance. The operation fails when the netdev is an upper of netdevs with different parent identifiers. Instead of failing the enslavement, have dev_get_port_parent_id() return '-EOPNOTSUPP' which will signal the bridge to skip the query operation. Other callers of the function are not affected by this change. Fixes: 7e1146e8c10c ("net: devlink: introduce devlink_compat_switch_id_get() helper") Signed-off-by: Ido Schimmel Reported-by: Vasundhara Volam Reviewed-by: Jiri Pirko Reviewed-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index 4086d335978c1b..266073e300b5fc 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -8647,7 +8647,7 @@ int dev_get_port_parent_id(struct net_device *dev, if (!first.id_len) first = *ppid; else if (memcmp(&first, ppid, sizeof(*ppid))) - return -ENODATA; + return -EOPNOTSUPP; } return err; From 6374a5606990ea4de7fe0f7035dd04422c4690f5 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 10 Sep 2020 14:01:27 +0300 Subject: [PATCH 2/2] selftests: rtnetlink: Test bridge enslavement with different parent IDs Test that an upper device of netdevs with different parent IDs can be enslaved to a bridge. The test fails without previous commit. Signed-off-by: Ido Schimmel Reviewed-by: Jiri Pirko Reviewed-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- tools/testing/selftests/net/rtnetlink.sh | 47 ++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh index 7c38a909f8b86c..8a2fe6d64bf242 100755 --- a/tools/testing/selftests/net/rtnetlink.sh +++ b/tools/testing/selftests/net/rtnetlink.sh @@ -1175,6 +1175,51 @@ kci_test_neigh_get() echo "PASS: neigh get" } +kci_test_bridge_parent_id() +{ + local ret=0 + sysfsnet=/sys/bus/netdevsim/devices/netdevsim + probed=false + + if [ ! -w /sys/bus/netdevsim/new_device ] ; then + modprobe -q netdevsim + check_err $? + if [ $ret -ne 0 ]; then + echo "SKIP: bridge_parent_id can't load netdevsim" + return $ksft_skip + fi + probed=true + fi + + echo "10 1" > /sys/bus/netdevsim/new_device + while [ ! -d ${sysfsnet}10 ] ; do :; done + echo "20 1" > /sys/bus/netdevsim/new_device + while [ ! -d ${sysfsnet}20 ] ; do :; done + udevadm settle + dev10=`ls ${sysfsnet}10/net/` + dev20=`ls ${sysfsnet}20/net/` + + ip link add name test-bond0 type bond mode 802.3ad + ip link set dev $dev10 master test-bond0 + ip link set dev $dev20 master test-bond0 + ip link add name test-br0 type bridge + ip link set dev test-bond0 master test-br0 + check_err $? + + # clean up any leftovers + ip link del dev test-br0 + ip link del dev test-bond0 + echo 20 > /sys/bus/netdevsim/del_device + echo 10 > /sys/bus/netdevsim/del_device + $probed && rmmod netdevsim + + if [ $ret -ne 0 ]; then + echo "FAIL: bridge_parent_id" + return 1 + fi + echo "PASS: bridge_parent_id" +} + kci_test_rtnl() { local ret=0 @@ -1224,6 +1269,8 @@ kci_test_rtnl() check_err $? kci_test_neigh_get check_err $? + kci_test_bridge_parent_id + check_err $? kci_del_dummy return $ret