DEV9: Increase allowed number of to be ACKed tcp packets

pcsx2/DEV9/Sessions/TCP_Session/TCP_Session.cpp

@@ -55,6 +55,11 @@ namespace Sessions
 		std::lock_guard numberlock(myNumberSentry);
 		return GetDelta(_MySequenceNumber, _ReceivedAckNumber);
 	}
+	bool TCP_Session::ShouldWaitForAck()
+	{
+		std::lock_guard numberlock(myNumberSentry);
+		return _OldMyNumbers[0] == _ReceivedAckNumber;
+	}
 	std::tuple<u32, std::vector<u32>> TCP_Session::GetAllMyNumbers()
 	{
 		std::lock_guard numberlock(myNumberSentry);

pcsx2/DEV9/Sessions/TCP_Session/TCP_Session.h

@@ -93,6 +93,7 @@ namespace Sessions
 		void UpdateReceivedAckNumber(u32 ack);
 		u32 GetMyNumber();
 		u32 GetOutstandingSequenceLength();
+		bool ShouldWaitForAck();
 		std::tuple<u32, std::vector<u32>> GetAllMyNumbers();
 		void ResetMyNumbers();
 

pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_In.cpp

@@ -67,6 +67,8 @@ namespace Sessions
 				return nullptr;
 		}
 
+		if (ShouldWaitForAck())
+			return nullptr;
 
 		//Note, windowSize will be updated before _ReceivedAckNumber, potential race condition
 		//in practice, we just get a smaller or -ve maxSize
@@ -78,8 +80,7 @@ namespace Sessions
 		else
 			maxSize = std::min<int>(maxSegmentSize, windowSize.load() - outstanding);
 
-		if (maxSize > 0 &&
-			myNumberACKed.load())
+		if (maxSize > 0)
 		{
 			std::unique_ptr<u8[]> buffer;
 			int err = 0;