net/mlx5: E-Switch, Add callback to get representor device

Add a callback interface to get a protocol device (per representor type).
The Ethernet representors will expose their netdev via this interface.

This functionality can be later used by IB representor in order to find the
corresponding net device representor.
Signed-off-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -1156,6 +1156,15 @@ mlx5e_vport_rep_unload(struct mlx5_eswitch_rep *rep)
 	kfree(ppriv); /* mlx5e_rep_priv */
 }
 
+static void *mlx5e_vport_rep_get_proto_dev(struct mlx5_eswitch_rep *rep)
+{
+	struct mlx5e_rep_priv *rpriv;
+
+	rpriv = mlx5e_rep_to_rep_priv(rep);
+
+	return rpriv->netdev;
+}
+
 static void mlx5e_rep_register_vf_vports(struct mlx5e_priv *priv)
 {
 	struct mlx5_core_dev *mdev = priv->mdev;
@@ -1168,6 +1177,7 @@ static void mlx5e_rep_register_vf_vports(struct mlx5e_priv *priv)
 
 		rep_if.load = mlx5e_vport_rep_load;
 		rep_if.unload = mlx5e_vport_rep_unload;
+		rep_if.get_proto_dev = mlx5e_vport_rep_get_proto_dev;
 		mlx5_eswitch_register_vport_rep(esw, vport, &rep_if, REP_ETH);
 	}
 }
@@ -1195,6 +1205,7 @@ void mlx5e_register_vport_reps(struct mlx5e_priv *priv)
 
 	rep_if.load = mlx5e_nic_rep_load;
 	rep_if.unload = mlx5e_nic_rep_unload;
+	rep_if.get_proto_dev = mlx5e_vport_rep_get_proto_dev;
 	rep_if.priv = rpriv;
 	INIT_LIST_HEAD(&rpriv->vport_sqs_list);
 	mlx5_eswitch_register_vport_rep(esw, 0, &rep_if, REP_ETH); /* UPLINK PF vport*/

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -150,6 +150,7 @@ struct mlx5_eswitch_rep_if {
 	int		       (*load)(struct mlx5_core_dev *dev,
 				       struct mlx5_eswitch_rep *rep);
 	void		       (*unload)(struct mlx5_eswitch_rep *rep);
+	void		       *(*get_proto_dev)(struct mlx5_eswitch_rep *rep);
 	void			*priv;
 	bool		       valid;
 };
@@ -286,6 +287,10 @@ void mlx5_eswitch_unregister_vport_rep(struct mlx5_eswitch *esw,
 				       int vport_index,
 				       u8 rep_type);
 void *mlx5_eswitch_get_uplink_priv(struct mlx5_eswitch *esw, u8 rep_type);
+void *mlx5_eswitch_get_proto_dev(struct mlx5_eswitch *esw,
+				 int vport,
+				 u8 rep_type);
+void *mlx5_eswitch_uplink_get_proto_dev(struct mlx5_eswitch *esw, u8 rep_type);
 
 int mlx5_eswitch_add_vlan_action(struct mlx5_eswitch *esw,
 				 struct mlx5_esw_flow_attr *attr);

drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c

@@ -1160,6 +1160,7 @@ void mlx5_eswitch_register_vport_rep(struct mlx5_eswitch *esw,
 
 	rep_if->load   = __rep_if->load;
 	rep_if->unload = __rep_if->unload;
+	rep_if->get_proto_dev = __rep_if->get_proto_dev;
 	rep_if->priv = __rep_if->priv;
 
 	rep_if->valid = true;
@@ -1188,3 +1189,26 @@ void *mlx5_eswitch_get_uplink_priv(struct mlx5_eswitch *esw, u8 rep_type)
 	rep = &offloads->vport_reps[UPLINK_REP_INDEX];
 	return rep->rep_if[rep_type].priv;
 }
+
+void *mlx5_eswitch_get_proto_dev(struct mlx5_eswitch *esw,
+				 int vport,
+				 u8 rep_type)
+{
+	struct mlx5_esw_offload *offloads = &esw->offloads;
+	struct mlx5_eswitch_rep *rep;
+
+	if (vport == FDB_UPLINK_VPORT)
+		vport = UPLINK_REP_INDEX;
+
+	rep = &offloads->vport_reps[vport];
+
+	if (rep->rep_if[rep_type].valid &&
+	    rep->rep_if[rep_type].get_proto_dev)
+		return rep->rep_if[rep_type].get_proto_dev(rep);
+	return NULL;
+}
+
+void *mlx5_eswitch_uplink_get_proto_dev(struct mlx5_eswitch *esw, u8 rep_type)
+{
+	return mlx5_eswitch_get_proto_dev(esw, UPLINK_REP_INDEX, rep_type);
+}