netdev - [PATCH net-next 01/10] mlxsw: spectrum: Tolerate enslaving of various devices to VRF

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Date:   Sun,  8 May 2022 11:08:14 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, petrm@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 01/10] mlxsw: spectrum: Tolerate enslaving of various devices to VRF

From: Petr Machata <petrm@...dia.com>

Enslaving netdevices to VRF is currently handled through an
mlxsw_sp_is_vrf_event() conditional in mlxsw_sp_netdevice_event(). In the
following patch sets, VRF enslavement will be handled purely in the router
code. Therefore make handlers of NETDEV_PRECHANGEUPPER tolerant of
enslaving to VRF, so that they do not bounce the change.

For NETDEV_CHANGEUPPER, drop the WARN_ON(1) and bounce from
mlxsw_sp_netdevice_port_vlan_event(). This is the only handler that warned
and bounces even in the CHANGEUPPER code, other handler quietly do nothing
when they encounter an unfamiliar upper.

Signed-off-by: Petr Machata <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum.c    | 26 ++++++++++++-------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index ac6348e2ff1f..12fd846a778f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -4525,7 +4525,8 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *lower_dev,
 		    !netif_is_lag_master(upper_dev) &&
 		    !netif_is_bridge_master(upper_dev) &&
 		    !netif_is_ovs_master(upper_dev) &&
-		    !netif_is_macvlan(upper_dev)) {
+		    !netif_is_macvlan(upper_dev) &&
+		    !netif_is_l3_master(upper_dev)) {
 			NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
 			return -EINVAL;
 		}
@@ -4724,7 +4725,8 @@ static int mlxsw_sp_netdevice_port_vlan_event(struct net_device *vlan_dev,
 	case NETDEV_PRECHANGEUPPER:
 		upper_dev = info->upper_dev;
 		if (!netif_is_bridge_master(upper_dev) &&
-		    !netif_is_macvlan(upper_dev)) {
+		    !netif_is_macvlan(upper_dev) &&
+		    !netif_is_l3_master(upper_dev)) {
 			NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
 			return -EINVAL;
 		}
@@ -4763,9 +4765,6 @@ static int mlxsw_sp_netdevice_port_vlan_event(struct net_device *vlan_dev,
 		} else if (netif_is_macvlan(upper_dev)) {
 			if (!info->linking)
 				mlxsw_sp_rif_macvlan_del(mlxsw_sp, upper_dev);
-		} else {
-			err = -EINVAL;
-			WARN_ON(1);
 		}
 		break;
 	}
@@ -4813,7 +4812,8 @@ static int mlxsw_sp_netdevice_bridge_vlan_event(struct net_device *vlan_dev,
 	switch (event) {
 	case NETDEV_PRECHANGEUPPER:
 		upper_dev = info->upper_dev;
-		if (!netif_is_macvlan(upper_dev)) {
+		if (!netif_is_macvlan(upper_dev) &&
+		    !netif_is_l3_master(upper_dev)) {
 			NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
 			return -EOPNOTSUPP;
 		}
@@ -4874,7 +4874,9 @@ static int mlxsw_sp_netdevice_bridge_event(struct net_device *br_dev,
 	switch (event) {
 	case NETDEV_PRECHANGEUPPER:
 		upper_dev = info->upper_dev;
-		if (!is_vlan_dev(upper_dev) && !netif_is_macvlan(upper_dev)) {
+		if (!is_vlan_dev(upper_dev) &&
+		    !netif_is_macvlan(upper_dev) &&
+		    !netif_is_l3_master(upper_dev)) {
 			NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
 			return -EOPNOTSUPP;
 		}
@@ -4918,16 +4920,20 @@ static int mlxsw_sp_netdevice_macvlan_event(struct net_device *macvlan_dev,
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_lower_get(macvlan_dev);
 	struct netdev_notifier_changeupper_info *info = ptr;
 	struct netlink_ext_ack *extack;
+	struct net_device *upper_dev;
 
 	if (!mlxsw_sp || event != NETDEV_PRECHANGEUPPER)
 		return 0;
 
 	extack = netdev_notifier_info_to_extack(&info->info);
+	upper_dev = info->upper_dev;
 
-	/* VRF enslavement is handled in mlxsw_sp_netdevice_vrf_event() */
-	NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
+	if (!netif_is_l3_master(upper_dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
+		return -EOPNOTSUPP;
+	}
 
-	return -EOPNOTSUPP;
+	return 0;
 }
 
 static bool mlxsw_sp_is_vrf_event(unsigned long event, void *ptr)
-- 
2.35.1