Added Recirculation for PNA_NIC

Signed-off-by: Rupesh Chiluka <[email protected]>
p4lang · Nov 1, 2024 · 3da4f69 · 3da4f69
1 parent 28b736c
commit 3da4f69
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Showing 2 changed files with 19 additions and 0 deletions.
diff --git a/targets/pna_nic/pna_nic.cpp b/targets/pna_nic/pna_nic.cpp
@@ -204,6 +204,24 @@ PnaNic::main_thread() {
 
     Deparser *deparser = this->get_deparser("main_deparser");
     deparser->deparse(packet.get());
+
+    // recirculation
+    if ((port_t) packet->get_egress_port() == PNA_PORT_RECIRCULATE) {
+      BMLOG_DEBUG_PKT(*packet, "Recirculating packet");
+
+      phv->reset();
+      phv->reset_header_stacks();
+      phv->reset_metadata();
+
+      phv->get_field("pna_main_parser_input_metadata.input_port")
+        .set(input_port);
+      phv->get_field("pna_main_parser_input_metadata.recirculated")
+        .set(1);
+
+      input_buffer.push_front(std::move(packet));
+      continue;
+    }
+
     output_buffer.push_front(std::move(packet));
   }
 }

diff --git a/targets/pna_nic/pna_nic.h b/targets/pna_nic/pna_nic.h
@@ -79,6 +79,7 @@ class PnaNic : public Switch {
 
  private:
   static packet_id_t packet_id;
+  static constexpr port_t PNA_PORT_RECIRCULATE = 0xfffffffa;
 
   enum PktInstanceType {
     FROM_NET_PORT,