From 3e3d34d97b7b687bac71d48269e7279d5ea0a6de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin@reactos.org>
Date: Wed, 13 Dec 2023 19:54:50 +0100
Subject: [PATCH] [TCPIP] Get max link speed, MTU and max packet size when
 adapter is connected

---
 drivers/network/tcpip/datalink/lan.c | 73 +++++++++++++---------------
 drivers/network/tcpip/include/lan.h  |  2 +-
 2 files changed, 34 insertions(+), 41 deletions(-)

diff --git a/drivers/network/tcpip/datalink/lan.c b/drivers/network/tcpip/datalink/lan.c
index 0440c098f49..ccd0f555ef5 100644
--- a/drivers/network/tcpip/datalink/lan.c
+++ b/drivers/network/tcpip/datalink/lan.c
@@ -718,7 +718,7 @@ BOOLEAN ReconfigureAdapter(PRECONFIGURE_CONTEXT Context)
 {
     PLAN_ADAPTER Adapter = Context->Adapter;
     PIP_INTERFACE Interface = Adapter->Context;
-    //NDIS_STATUS NdisStatus;
+    NDIS_STATUS NdisStatus;
     IP_ADDRESS DefaultMask;
 
     /* Initialize the default unspecified address (0.0.0.0) */
@@ -754,48 +754,41 @@ BOOLEAN ReconfigureAdapter(PRECONFIGURE_CONTEXT Context)
     TCPUpdateInterfaceIPInformation(Interface);
     TCPUpdateInterfaceLinkStatus(Interface);
 
-    /* We're done here if the adapter isn't connected */
-    if (Context->State != LAN_STATE_STARTED)
+    if (Context->State == LAN_STATE_STARTED)
     {
-        Adapter->State = Context->State;
-        return TRUE;
+        /* Get maximum link speed */
+        NdisStatus = NDISCall(Adapter,
+                              NdisRequestQueryInformation,
+                              OID_GEN_LINK_SPEED,
+                              &Interface->Speed,
+                              sizeof(Interface->Speed));
+
+        if (!NT_SUCCESS(NdisStatus))
+            Interface->Speed = IP_DEFAULT_LINK_SPEED;
+
+        Adapter->Speed = Interface->Speed * 100L;
+
+        /* Get maximum frame size */
+        NdisStatus = NDISCall(Adapter,
+                              NdisRequestQueryInformation,
+                              OID_GEN_MAXIMUM_FRAME_SIZE,
+                              &Adapter->MTU,
+                              sizeof(Adapter->MTU));
+        if (NdisStatus != NDIS_STATUS_SUCCESS)
+            return FALSE;
+
+        Interface->MTU = Adapter->MTU;
+
+        /* Get maximum packet size */
+        NdisStatus = NDISCall(Adapter,
+                              NdisRequestQueryInformation,
+                              OID_GEN_MAXIMUM_TOTAL_SIZE,
+                              &Adapter->MaxPacketSize,
+                              sizeof(Adapter->MaxPacketSize));
+        if (NdisStatus != NDIS_STATUS_SUCCESS)
+            return FALSE;
     }
 
-    /* NDIS Bug! */
-#if 0
-    /* Get maximum link speed */
-    NdisStatus = NDISCall(Adapter,
-                          NdisRequestQueryInformation,
-                          OID_GEN_LINK_SPEED,
-                          &Interface->Speed,
-                          sizeof(UINT));
-
-    if (!NT_SUCCESS(NdisStatus))
-        Interface->Speed = IP_DEFAULT_LINK_SPEED;
-
-    Adapter->Speed = Interface->Speed * 100L;
-
-    /* Get maximum frame size */
-    NdisStatus = NDISCall(Adapter,
-                          NdisRequestQueryInformation,
-                          OID_GEN_MAXIMUM_FRAME_SIZE,
-                          &Adapter->MTU,
-                          sizeof(UINT));
-    if (NdisStatus != NDIS_STATUS_SUCCESS)
-        return FALSE;
-
-    Interface->MTU = Adapter->MTU;
-
-    /* Get maximum packet size */
-    NdisStatus = NDISCall(Adapter,
-                          NdisRequestQueryInformation,
-                          OID_GEN_MAXIMUM_TOTAL_SIZE,
-                          &Adapter->MaxPacketSize,
-                          sizeof(UINT));
-    if (NdisStatus != NDIS_STATUS_SUCCESS)
-        return FALSE;
-#endif
-
     Adapter->State = Context->State;
 
     return TRUE;
diff --git a/drivers/network/tcpip/include/lan.h b/drivers/network/tcpip/include/lan.h
index ab8f4bc5ba6..f99f588188e 100644
--- a/drivers/network/tcpip/include/lan.h
+++ b/drivers/network/tcpip/include/lan.h
@@ -52,7 +52,7 @@ typedef struct LAN_ADAPTER {
     UCHAR BCastCheck;                       /* Value to check against */
     UCHAR BCastOffset;                      /* Offset in frame to check against */
     UCHAR HeaderSize;                       /* Size of link-level header */
-    USHORT MTU;                             /* Maximum Transfer Unit */
+    UINT MTU;                               /* Maximum Transfer Unit */
     UINT MinFrameSize;                      /* Minimum frame size in bytes */
     UINT MaxPacketSize;                     /* Maximum packet size when sending */
     UINT MaxSendPackets;                    /* Maximum number of packets per send */