Kernel/net: Add tracking of dropped packets per adapter

Author: https://github.com/menisisaac 🔰
Commit: https://github.com/SerenityOS/serenity/commit/3d2fcf4244
Pull-request: https://github.com/SerenityOS/serenity/pull/24262
Reviewed-by: https://github.com/AtkinsSJ

Kernel/FileSystem/SysFS/Subsystems/Kernel/Network/Adapters.cpp

@@ -44,6 +44,7 @@ ErrorOr<void> SysFSNetworkAdaptersStats::try_generate(KBufferBuilder& builder)
         TRY(obj.add("link_speed"sv, adapter.link_speed()));
         TRY(obj.add("link_full_duplex"sv, adapter.link_full_duplex()));
         TRY(obj.add("mtu"sv, adapter.mtu()));
+        TRY(obj.add("packets_dropped"sv, adapter.packets_dropped()));
         TRY(obj.finish());
         return {};
     }));

Kernel/Net/NetworkAdapter.cpp

@@ -76,7 +76,7 @@ void NetworkAdapter::did_receive(ReadonlyBytes payload)
     m_bytes_in += payload.size();
 
     if (m_packet_queue_size == max_packet_buffers) {
-        // FIXME: Keep track of the number of dropped packets
+        m_packets_dropped++;
         return;
     }
 

Kernel/Net/NetworkAdapter.h

@@ -90,6 +90,7 @@ public:
     u32 bytes_in() const { return m_bytes_in; }
     u32 packets_out() const { return m_packets_out; }
     u32 bytes_out() const { return m_bytes_out; }
+    u32 packets_dropped() const { return m_packets_dropped; }
 
     RefPtr<PacketWithTimestamp> acquire_packet_buffer(size_t);
     void release_packet_buffer(PacketWithTimestamp&);
@@ -126,6 +127,7 @@ private:
     u32 m_packets_out { 0 };
     u32 m_bytes_out { 0 };
     u32 m_mtu { 1500 };
+    u32 m_packets_dropped { 0 };
 };
 
 }