Add RX/TX dup counters to ETCP monitor GUI

- Add IDC_EDIT_ETCP_RX_DUP and IDC_EDIT_ETCP_TX_DUP controls
- Insert RX Dup / TX Dup fields after Retrans in ETCP Metrics group
- Update tooltips, metrics display and clear functions

tools/etcpmon/etcpmon_gui.c

@@ -315,19 +315,32 @@ static void CreateControls(struct etcpmon_app* app) {
         WS_CHILD | WS_VISIBLE | ES_READONLY,
         mx + 285, my, 100, 20, hWnd, (HMENU)IDC_EDIT_ETCP_RETRANS, hInst, NULL);
     
+    my += 25;
+    CreateWindowExA(0, "STATIC", "RX Dup:",
+        WS_CHILD | WS_VISIBLE, mx, my, 80, 20, hWnd, (HMENU)IDC_STATIC, hInst, NULL);
+    app->hEditEtcpRxDup = CreateWindowExA(WS_EX_CLIENTEDGE, "EDIT", "",
+        WS_CHILD | WS_VISIBLE | ES_READONLY,
+        mx + 85, my, 100, 20, hWnd, (HMENU)IDC_EDIT_ETCP_RX_DUP, hInst, NULL);
+
+    CreateWindowExA(0, "STATIC", "TX Dup:",
+        WS_CHILD | WS_VISIBLE, mx + 200, my, 80, 20, hWnd, (HMENU)IDC_STATIC, hInst, NULL);
+    app->hEditEtcpTxDup = CreateWindowExA(WS_EX_CLIENTEDGE, "EDIT", "",
+        WS_CHILD | WS_VISIBLE | ES_READONLY,
+        mx + 285, my, 100, 20, hWnd, (HMENU)IDC_EDIT_ETCP_TX_DUP, hInst, NULL);
+
     my += 25;
     CreateWindowExA(0, "STATIC", "ACKs:",
         WS_CHILD | WS_VISIBLE, mx, my, 80, 20, hWnd, (HMENU)IDC_STATIC, hInst, NULL);
     app->hEditEtcpAcks = CreateWindowExA(WS_EX_CLIENTEDGE, "EDIT", "",
         WS_CHILD | WS_VISIBLE | ES_READONLY,
         mx + 85, my, 100, 20, hWnd, (HMENU)IDC_EDIT_ETCP_ACKS, hInst, NULL);
-    
+
     CreateWindowExA(0, "STATIC", "Inflight:",
         WS_CHILD | WS_VISIBLE, mx + 200, my, 80, 20, hWnd, (HMENU)IDC_STATIC, hInst, NULL);
     app->hEditEtcpInflight = CreateWindowExA(WS_EX_CLIENTEDGE, "EDIT", "",
         WS_CHILD | WS_VISIBLE | ES_READONLY,
         mx + 285, my, 100, 20, hWnd, (HMENU)IDC_EDIT_ETCP_INFLIGHT, hInst, NULL);
-    
+
     my += 25;
     CreateWindowExA(0, "STATIC", "Links:",
         WS_CHILD | WS_VISIBLE, mx, my, 80, 20, hWnd, (HMENU)IDC_STATIC, hInst, NULL);
@@ -738,6 +751,10 @@ static void CreateTooltips(struct etcpmon_app* app)
         "etcp.bytes_sent_total / ETCP Connection\r\nTotal bytes sent since connection start");
     AddTooltip(app->hToolTip, app->hEditEtcpRetrans,
         "etcp.retrans_count / ETCP Connection\r\nNumber of retransmissions (resent packets)");
+    AddTooltip(app->hToolTip, app->hEditEtcpRxDup,
+        "etcp.rx_dup_count / ETCP Connection\r\nLocal received duplicate packets counter");
+    AddTooltip(app->hToolTip, app->hEditEtcpTxDup,
+        "etcp.tx_dup_count / ETCP Connection\r\nRemote duplicate packets counter (from ACK)");
     AddTooltip(app->hToolTip, app->hEditEtcpAcks,
         "etcp.ack_count / ETCP Connection\r\nNumber of received ACK packets (confirmations)");
     AddTooltip(app->hToolTip, app->hEditEtcpInflight,
@@ -1226,6 +1243,8 @@ void etcpmon_gui_update_metrics(struct etcpmon_app* app,
     UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_JITTER,     "%.1f ms", metrics->etcp.jitter/10.f);
     UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_BYTES_SENT, "%llu",  (unsigned long long)metrics->etcp.bytes_sent_total);
     UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_RETRANS,    "%u",    metrics->etcp.retrans_count);
+    UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_RX_DUP,     "%u",    metrics->etcp.rx_dup_count);
+    UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_TX_DUP,     "%u",    metrics->etcp.tx_dup_count);
     UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_ACKS,       "%u",    metrics->etcp.ack_count);
     UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_INFLIGHT,   "%u bytes", metrics->etcp.unacked_bytes);
     UpdateEditIfChanged(hMain, IDC_EDIT_ETCP_LINKS,      "%u",    metrics->etcp.links_count);
@@ -1373,6 +1392,8 @@ void etcpmon_gui_clear_metrics(struct etcpmon_app* app) {
     SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_JITTER, "");
     SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_BYTES_SENT, "");
     SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_RETRANS, "");
+    SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_RX_DUP, "");
+    SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_TX_DUP, "");
     SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_ACKS, "");
     SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_INFLIGHT, "");
     SetDlgItemTextA(app->hWndMain, IDC_EDIT_ETCP_LINKS, "");

tools/etcpmon/etcpmon_gui.h

@@ -52,6 +52,8 @@ extern "C" {
 #define IDC_EDIT_ETCP_ACKS      207
 #define IDC_EDIT_ETCP_INFLIGHT  208
 #define IDC_EDIT_ETCP_LINKS     209
+#define IDC_EDIT_ETCP_RX_DUP    210
+#define IDC_EDIT_ETCP_TX_DUP    211
 
 /* TUN Metrics control IDs */
 #define IDC_EDIT_TUN_READ_BYTES  300
@@ -204,6 +206,8 @@ struct etcpmon_app {
     HWND hEditEtcpJitter;
     HWND hEditEtcpBytesSent;
     HWND hEditEtcpRetrans;
+    HWND hEditEtcpRxDup;
+    HWND hEditEtcpTxDup;
     HWND hEditEtcpAcks;
     HWND hEditEtcpInflight;
     HWND hEditEtcpLinks;