Merge branch 'mlxsw-Two-fixes'

Ido Schimmel says:

====================
mlxsw: Two fixes

This patchset contains two fixes for mlxsw.

Patch #1 from Petr fixes an issue in which DSCP rewrite can occur even
if the egress port was switched to Trust L2 mode where priority mapping
is based on PCP.

Patch #2 fixes a problem where packets can be learned on a non-existing
FID if a tc filter with a redirect action is configured on a bridged
port. The problem and fix are explained in detail in the commit message.

Please consider both patches for 5.2.y
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 25 insertions, 8 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index a252b080dda9..131f62ce9297 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -830,6 +830,7 @@ int mlxsw_sp_setup_tc_prio(struct mlxsw_sp_port *mlxsw_sp_port,
 			   struct tc_prio_qopt_offload *p);
 
 /* spectrum_fid.c */
+bool mlxsw_sp_fid_is_dummy(struct mlxsw_sp *mlxsw_sp, u16 fid_index);
 bool mlxsw_sp_fid_lag_vid_valid(const struct mlxsw_sp_fid *fid);
 struct mlxsw_sp_fid *mlxsw_sp_fid_lookup_by_index(struct mlxsw_sp *mlxsw_sp,
 						  u16 fid_index);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
index b25048c6c761..21296fa7f7fb 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
@@ -408,14 +408,6 @@ static int mlxsw_sp_port_dcb_app_update(struct mlxsw_sp_port *mlxsw_sp_port)
 	have_dscp = mlxsw_sp_port_dcb_app_prio_dscp_map(mlxsw_sp_port,
 							&prio_map);
 
-	if (!have_dscp) {
-		err = mlxsw_sp_port_dcb_toggle_trust(mlxsw_sp_port,
-					MLXSW_REG_QPTS_TRUST_STATE_PCP);
-		if (err)
-			netdev_err(mlxsw_sp_port->dev, "Couldn't switch to trust L2\n");
-		return err;
-	}
-
 	mlxsw_sp_port_dcb_app_dscp_prio_map(mlxsw_sp_port, default_prio,
 					    &dscp_map);
 	err = mlxsw_sp_port_dcb_app_update_qpdpm(mlxsw_sp_port,
@@ -432,6 +424,14 @@ static int mlxsw_sp_port_dcb_app_update(struct mlxsw_sp_port *mlxsw_sp_port)
 		return err;
 	}
 
+	if (!have_dscp) {
+		err = mlxsw_sp_port_dcb_toggle_trust(mlxsw_sp_port,
+					MLXSW_REG_QPTS_TRUST_STATE_PCP);
+		if (err)
+			netdev_err(mlxsw_sp_port->dev, "Couldn't switch to trust L2\n");
+		return err;
+	}
+
 	err = mlxsw_sp_port_dcb_toggle_trust(mlxsw_sp_port,
 					     MLXSW_REG_QPTS_TRUST_STATE_DSCP);
 	if (err) {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
index 46baf3b44309..8df3cb21baa6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
@@ -126,6 +126,16 @@ static const int *mlxsw_sp_packet_type_sfgc_types[] = {
 	[MLXSW_SP_FLOOD_TYPE_MC]	= mlxsw_sp_sfgc_mc_packet_types,
 };
 
+bool mlxsw_sp_fid_is_dummy(struct mlxsw_sp *mlxsw_sp, u16 fid_index)
+{
+	enum mlxsw_sp_fid_type fid_type = MLXSW_SP_FID_TYPE_DUMMY;
+	struct mlxsw_sp_fid_family *fid_family;
+
+	fid_family = mlxsw_sp->fid_core->fid_family_arr[fid_type];
+
+	return fid_family->start_index == fid_index;
+}
+
 bool mlxsw_sp_fid_lag_vid_valid(const struct mlxsw_sp_fid *fid)
 {
 	return fid->fid_family->lag_vid_valid;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 50111f228d77..5ecb45118400 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -2468,6 +2468,9 @@ static void mlxsw_sp_fdb_notify_mac_process(struct mlxsw_sp *mlxsw_sp,
 		goto just_remove;
 	}
 
+	if (mlxsw_sp_fid_is_dummy(mlxsw_sp, fid))
+		goto just_remove;
+
 	mlxsw_sp_port_vlan = mlxsw_sp_port_vlan_find_by_fid(mlxsw_sp_port, fid);
 	if (!mlxsw_sp_port_vlan) {
 		netdev_err(mlxsw_sp_port->dev, "Failed to find a matching {Port, VID} following FDB notification\n");
@@ -2527,6 +2530,9 @@ static void mlxsw_sp_fdb_notify_mac_lag_process(struct mlxsw_sp *mlxsw_sp,
 		goto just_remove;
 	}
 
+	if (mlxsw_sp_fid_is_dummy(mlxsw_sp, fid))
+		goto just_remove;
+
 	mlxsw_sp_port_vlan = mlxsw_sp_port_vlan_find_by_fid(mlxsw_sp_port, fid);
 	if (!mlxsw_sp_port_vlan) {
 		netdev_err(mlxsw_sp_port->dev, "Failed to find a matching {Port, VID} following FDB notification\n");