net/mlx5e: Expose same physical switch_id for all representors

Report system_image_guid as the E-Switch switch_id, this ensures
that when a NIC contains multiple PCI functions and which
has merged eswitch capability, all representors from
multiple PFs publish same switch_id.
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -391,30 +391,19 @@ static const struct ethtool_ops mlx5e_uplink_rep_ethtool_ops = {
 static int mlx5e_rep_get_port_parent_id(struct net_device *dev,
 					struct netdev_phys_item_id *ppid)
 {
-	struct mlx5e_priv *priv = netdev_priv(dev);
-	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
-	struct net_device *uplink_upper = NULL;
-	struct mlx5e_priv *uplink_priv = NULL;
-	struct net_device *uplink_dev;
+	struct mlx5_eswitch *esw;
+	struct mlx5e_priv *priv;
+	u64 parent_id;
+
+	priv = netdev_priv(dev);
+	esw = priv->mdev->priv.eswitch;
 
 	if (esw->mode == SRIOV_NONE)
 		return -EOPNOTSUPP;
 
-	uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
-	if (uplink_dev) {
-		uplink_upper = netdev_master_upper_dev_get(uplink_dev);
-		uplink_priv = netdev_priv(uplink_dev);
-	}
-
-	ppid->id_len = ETH_ALEN;
-	if (uplink_upper && mlx5_lag_is_sriov(uplink_priv->mdev)) {
-		ether_addr_copy(ppid->id, uplink_upper->dev_addr);
-	} else {
-		struct mlx5e_rep_priv *rpriv = priv->ppriv;
-		struct mlx5_eswitch_rep *rep = rpriv->rep;
-
-		ether_addr_copy(ppid->id, rep->hw_id);
-	}
+	parent_id = mlx5_query_nic_system_image_guid(priv->mdev);
+	ppid->id_len = sizeof(parent_id);
+	memcpy(ppid->id, &parent_id, sizeof(parent_id));
 
 	return 0;
 }