netdev - [PATCH net-next 03/11] mlxsw: spectrum_router: Take VID for VLAN FIDs from RIF params

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Message-ID: <3f8afcd841425ed5d11b71f2952e79b76b34307b.1689262695.git.petrm@nvidia.com>
Date: Thu, 13 Jul 2023 18:15:26 +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: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>,
	Danielle Ratson <danieller@...dia.com>, <mlxsw@...dia.com>
Subject: [PATCH net-next 03/11] mlxsw: spectrum_router: Take VID for VLAN FIDs from RIF params

Currently, when an IP address is added to a bridge that has no PVID, the
operation is rejected. An IP address addition is interpreted as a request
to create a RIF for the bridge device, but without a PVID there is no VLAN
for which the RIF should be created. Thus the correct way to create a RIF
for a bridge as a user is to first add a PVID, and then add the IP address.

Ideally this ordering requirement would not exist. RIF would be created
either because an IP address is added, or because a PVID is added,
depending on which comes last.

For that, the switchdev code (which notices the PVID change request) must
be able to request that a RIF is created with a given VLAN ID, because at
the time that the PVID notification is distributed, the PVID setting is not
yet visible for querying.

Therefore when creating a VLAN-based RIF, use mlxsw_sp_rif_params.vid to
communicate the VID, and do not determine it ad-hoc in the fid_get
callback.

Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Danielle Ratson <danieller@...dia.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_router.c | 31 +++++++++++--------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index adfb1ef2a664..e840ca9a9673 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -8665,14 +8665,17 @@ __mlxsw_sp_port_vlan_router_join(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan,
 {
 	struct mlxsw_sp_port *mlxsw_sp_port = mlxsw_sp_port_vlan->mlxsw_sp_port;
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
-	struct mlxsw_sp_rif_params params = {
-		.dev = l3_dev,
-	};
+	struct mlxsw_sp_rif_params params;
 	u16 vid = mlxsw_sp_port_vlan->vid;
 	struct mlxsw_sp_rif *rif;
 	struct mlxsw_sp_fid *fid;
 	int err;
 
+	params = (struct mlxsw_sp_rif_params) {
+		.dev = l3_dev,
+		.vid = vid,
+	};
+
 	mlxsw_sp_rif_subport_params_init(&params, mlxsw_sp_port_vlan);
 	rif = mlxsw_sp_rif_subport_get(mlxsw_sp, &params, extack);
 	if (IS_ERR(rif))
@@ -8830,6 +8833,7 @@ static int mlxsw_sp_inetaddr_bridge_event(struct mlxsw_sp *mlxsw_sp,
 		.dev = l3_dev,
 	};
 	struct mlxsw_sp_rif *rif;
+	int err;
 
 	switch (event) {
 	case NETDEV_UP:
@@ -8841,6 +8845,13 @@ static int mlxsw_sp_inetaddr_bridge_event(struct mlxsw_sp *mlxsw_sp,
 				NL_SET_ERR_MSG_MOD(extack, "Adding an IP address to 802.1ad bridge is not supported");
 				return -EOPNOTSUPP;
 			}
+			err = br_vlan_get_pvid(l3_dev, &params.vid);
+			if (err < 0 || !params.vid) {
+				NL_SET_ERR_MSG_MOD(extack, "Couldn't determine bridge PVID");
+				return -EINVAL;
+			}
+		} else if (is_vlan_dev(l3_dev)) {
+			params.vid = vlan_dev_vlan_id(l3_dev);
 		}
 		rif = mlxsw_sp_rif_create(mlxsw_sp, &params, extack);
 		if (IS_ERR(rif))
@@ -9877,23 +9888,17 @@ mlxsw_sp_rif_vlan_fid_get(struct mlxsw_sp_rif *rif,
 {
 	struct net_device *dev = mlxsw_sp_rif_dev(rif);
 	struct net_device *br_dev;
-	u16 vid;
-	int err;
+
+	if (WARN_ON(!params->vid))
+		return ERR_PTR(-EINVAL);
 
 	if (is_vlan_dev(dev)) {
-		vid = vlan_dev_vlan_id(dev);
 		br_dev = vlan_dev_real_dev(dev);
 		if (WARN_ON(!netif_is_bridge_master(br_dev)))
 			return ERR_PTR(-EINVAL);
-	} else {
-		err = br_vlan_get_pvid(dev, &vid);
-		if (err < 0 || !vid) {
-			NL_SET_ERR_MSG_MOD(extack, "Couldn't determine bridge PVID");
-			return ERR_PTR(-EINVAL);
-		}
 	}
 
-	return mlxsw_sp_fid_8021q_get(rif->mlxsw_sp, vid);
+	return mlxsw_sp_fid_8021q_get(rif->mlxsw_sp, params->vid);
 }
 
 static void mlxsw_sp_rif_vlan_fdb_del(struct mlxsw_sp_rif *rif, const char *mac)
-- 
2.40.1