added 3 bmv2 examples: copy_to_cpu, meter, TLV_parsing

examples/meter/p4src/meter.p4

@@ -0,0 +1,82 @@
+header_type ethernet_t {
+    fields {
+        dstAddr : 48;
+        srcAddr : 48;
+        etherType : 16;
+    }
+}
+
+header_type intrinsic_metadata_t {
+    fields {
+        mcast_grp : 4;
+        egress_rid : 4;
+        mcast_hash : 16;
+        lf_field_list: 32;
+    }
+}
+
+header_type meta_t {
+    fields {
+        meter_tag : 32;
+    }
+}
+
+metadata meta_t meta;
+
+parser start {
+    return parse_ethernet;
+}
+
+header ethernet_t ethernet;
+metadata intrinsic_metadata_t intrinsic_metadata;
+
+parser parse_ethernet {
+    extract(ethernet);
+    return ingress;
+}
+
+action _drop() {
+    drop();
+}
+
+action _nop() {
+}
+
+meter my_meter {
+    type: packets; // or bytes
+    static: m_table;
+    instance_count: 16384;
+}
+
+action m_action(meter_idx) {
+    execute_meter(my_meter, meter_idx, meta.meter_tag);
+    modify_field(standard_metadata.egress_spec, 1);
+}
+
+table m_table {
+    reads {
+        ethernet.srcAddr : exact;
+    }
+    actions {
+        m_action; _nop;
+    }
+    size : 16384;
+}
+
+table m_filter {
+    reads {
+        meta.meter_tag : exact;
+    }
+    actions {
+        _drop; _nop;
+    }
+    size: 16;
+}
+
+control ingress {
+    apply(m_table);
+    apply(m_filter);
+}
+
+control egress {
+}