added networking components, hosts are next

src/network/switch/shared_buffer.h

@@ -0,0 +1,39 @@
+#ifndef NETWORK_SWITCH_SHARED_BUFFER_H
+#define NETWORK_SWITCH_SHARED_BUFFER_H
+
+#include "network/switch/switch_buffer.h"
+
+namespace dofs {
+
+// SharedBuffer: a single global memory pool shared by all ports.
+// Only guard is the total pool (_buffer_bytes). Per-port usage tracked for stats.
+class SharedBuffer : public SwitchBuffer {
+public:
+        SharedBuffer(Simulator* const sim,
+                     NetworkSwitch* const owner,
+                     Bytes total_bytes,
+                     uint16_t ports);
+
+        virtual bool enqueue_packet(const Packet& pkt, PortId egress,
+                                    FlowPriority prio) override;
+        virtual bool drain_one(PortId port) override;
+
+protected:
+        virtual std::array<std::deque<Queued>, PRI_COUNT> &queues_for(
+                PortId p) override;
+        virtual const std::array<std::deque<Queued>, PRI_COUNT> &queues_for(
+                PortId p) const override;
+
+        virtual bool on_enqueue_cap_check(PortId port, Bytes sz) override;
+        virtual void on_enqueue_commit(PortId port, Bytes sz) override;
+        virtual void on_dequeue_commit(PortId port, Bytes sz) override;
+
+private:
+        // Per-port, per-priority queues
+        std::vector<std::array<std::deque<Queued>, PRI_COUNT >> _per_port_queues;
+        Bytes _used_total;
+};
+
+} // namespace dofs
+
+#endif // NETWORK_SWITCH_SHARED_BUFFER_H