P4 Sandbox

P4 Program:

#include <core.p4>
      #include <v1model.p4>
      
      header hdr {
          bit<32> a;
          bit<32> b;
          bit<64> c;
      }
      
      #ifdef _CORE_P4_
      
      struct Headers {
          hdr h;
      }
      
      struct Meta {}
      
      parser p(packet_in b, out Headers h, inout Meta m, inout standard_metadata_t sm) {
          state start {
              b.extract(h.h);
              transition accept;
          }
      }
      
      control vrfy(inout Headers h, inout Meta m) { apply {} }
      control update(inout Headers h, inout Meta m) { apply {} }
      
      control egress(inout Headers h, inout Meta m, inout standard_metadata_t sm) { apply {} }
      
      control deparser(packet_out b, in Headers h) {
          apply { b.emit(h.h); }
      }
      
      #endif
      
      control ingress(inout Headers h, inout Meta m, inout standard_metadata_t sm) {
          action add()
          { h.h.c = (bit<64>)(h.h.a + h.h.b); sm.egress_spec = 0; }
          table t {
              actions = { add; }
              const default_action = add;
          }
          apply { t.apply(); }
      }
      
      V1Switch(p(), vrfy(), ingress(), egress(), update(), deparser()) main;

Architecture:

P4 Sandbox

Output: