Method GetRuntimeConfig

core/modules/exact_match.cc:150–187

Retrieves an ExactMatchConfig that would restore this module's runtime configuration.

// Retrieves an ExactMatchConfig that would restore this module's
// runtime configuration.
CommandResponse ExactMatch::GetRuntimeConfig(const bess::pb::EmptyArg &) {
  bess::pb::ExactMatchConfig r;
  using rule_t = bess::pb::ExactMatchCommandAddArg;

  r.set_default_gate(default_gate_);
  for (auto const &kv : table_) {
    auto const &key = kv.first;
    auto const &value = kv.second;
    rule_t *rule = r.add_rules();

    rule->set_gate(value);
    for (size_t i = 0; i < table_.num_fields(); i++) {
      const ExactMatchField &f = table_.get_field(i);
      bess::pb::FieldData *field = rule->add_fields();

      // See GetInitialArg above for why we only set_value_bin here.
      const char *ptr = reinterpret_cast<const char *>(&key.u64_arr[0]);
      field->set_value_bin(ptr + f.pos, f.size);
    }
  }
  std::sort(r.mutable_rules()->begin(), r.mutable_rules()->end(),
            [this](const rule_t &a, const rule_t &b) {
              // Primary sort key is gate number.
              if (a.gate() != b.gate()) {
                return a.gate() < b.gate();
              }
              // After that, sort by value-to-be-matched, in field order.
              for (size_t i = 0; i < table_.num_fields(); i++) {
                if (a.fields(i).value_bin() != b.fields(i).value_bin()) {
                  return a.fields(i).value_bin() < b.fields(i).value_bin();
                }
              }
              // Huh: a, b exactly equal - should not happen unless
              // std::sort() is poor.
              return false;
            });
  return CommandSuccess(r);
}

Error ExactMatch::AddRule(const bess::pb::ExactMatchCommandAddArg &arg) {
  gate_idx_t gate = arg.gate();