[cgutman] 41698: - Allocate IP_PACKET on the stack - Reduces non-paged memory consumption

Author: cgutman
Date: Tue Jun 30 00:18:32 2009
New Revision: 41698

URL: http://svn.reactos.org/svn/reactos?rev=41698&view=rev
Log:
 - Allocate IP_PACKET on the stack
 - Reduces non-paged memory consumption

Modified:
    trunk/reactos/lib/drivers/ip/network/ip.c
    trunk/reactos/lib/drivers/ip/network/receive.c

Modified: trunk/reactos/lib/drivers/ip/network/ip.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/drivers/ip/network/ip.…
==============================================================================
--- trunk/reactos/lib/drivers/ip/network/ip.c [iso-8859-1] (original)
+++ trunk/reactos/lib/drivers/ip/network/ip.c [iso-8859-1] Tue Jun 30 00:18:32 2009
@@ -19,23 +19,9 @@
 UINT MinLLFrameSize;  /* Largest minimum frame size */
 BOOLEAN IPInitialized = FALSE;
 BOOLEAN IpWorkItemQueued = FALSE;
-NPAGED_LOOKASIDE_LIST IPPacketList;
 /* Work around calling timer at Dpc level */
 
 IP_PROTOCOL_HANDLER ProtocolTable[IP_PROTOCOL_TABLE_SIZE];
-
-
-VOID FreePacket(
-    PVOID Object)
-/*
- * FUNCTION: Frees an IP packet object
- * ARGUMENTS:
- *     Object = Pointer to an IP packet structure
- */
-{
-    exFreeToNPagedLookasideList(&IPPacketList, Object);
-}
-
 
 VOID DontFreePacket(
     PVOID Object)
@@ -56,34 +42,6 @@
  */
 {
     exFreePool(Object);
-}
-
-
-PIP_PACKET IPCreatePacket(ULONG Type)
-/*
- * FUNCTION: Creates an IP packet object
- * ARGUMENTS:
- *     Type = Type of IP packet
- * RETURNS:
- *     Pointer to the created IP packet. NULL if there was not enough free resources.
- */
-{
-  PIP_PACKET IPPacket;
-
-  IPPacket = exAllocateFromNPagedLookasideList(&IPPacketList);
-  if (!IPPacket)
-    return NULL;
-
-    /* FIXME: Is this needed? */
-  RtlZeroMemory(IPPacket, sizeof(IP_PACKET));
-
-  INIT_TAG(IPPacket, TAG('I','P','K','T'));
-
-  IPPacket->Free       = FreePacket;
-  IPPacket->Type       = Type;
-  IPPacket->HeaderSize = 20;
-
-  return IPPacket;
 }
 
 PIP_PACKET IPInitializePacket(
@@ -416,15 +374,6 @@
 	    0);                             /* Depth */
 
     ExInitializeNPagedLookasideList(
-      &IPPacketList,                  /* Lookaside list */
-	    NULL,                           /* Allocate routine */
-	    NULL,                           /* Free routine */
-	    0,                              /* Flags */
-	    sizeof(IP_PACKET),              /* Size of each entry */
-	    TAG('I','P','P','K'),           /* Tag */
-	    0);                             /* Depth */
-
-    ExInitializeNPagedLookasideList(
       &IPFragmentList,                /* Lookaside list */
 	    NULL,                           /* Allocate routine */
 	    NULL,                           /* Free routine */
@@ -491,7 +440,6 @@
     /* Destroy lookaside lists */
     ExDeleteNPagedLookasideList(&IPHoleList);
     ExDeleteNPagedLookasideList(&IPDRList);
-    ExDeleteNPagedLookasideList(&IPPacketList);
     ExDeleteNPagedLookasideList(&IPFragmentList);
 
     IPInitialized = FALSE;

Modified: trunk/reactos/lib/drivers/ip/network/receive.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/drivers/ip/network/rec…
==============================================================================
--- trunk/reactos/lib/drivers/ip/network/receive.c [iso-8859-1] (original)
+++ trunk/reactos/lib/drivers/ip/network/receive.c [iso-8859-1] Tue Jun 30 00:18:32 2009
@@ -174,7 +174,9 @@
 }
 
 
-PIP_PACKET ReassembleDatagram(
+BOOLEAN
+ReassembleDatagram(
+  PIP_PACKET             IPPacket,
   PIPDATAGRAM_REASSEMBLY IPDR)
 /*
  * FUNCTION: Reassembles an IP datagram
@@ -189,7 +191,6 @@
  *     At this point, header is expected to point to the IP header
  */
 {
-  PIP_PACKET IPPacket;
   PLIST_ENTRY CurrentEntry;
   PIP_FRAGMENT Current;
   PVOID Data;
@@ -200,11 +201,6 @@
 
   TI_DbgPrint(DEBUG_IP, ("Fragment header:\n"));
   //OskitDumpBuffer((PCHAR)IPDR->IPv4Header, IPDR->HeaderSize);
-
-  /* FIXME: Assume IPv4 */
-  IPPacket = IPCreatePacket(IP_ADDRESS_V4);
-  if (!IPPacket)
-    return NULL;
 
   IPPacket->TotalSize  = IPDR->HeaderSize + IPDR->DataSize;
   IPPacket->ContigSize = IPPacket->TotalSize;
@@ -219,7 +215,7 @@
   if (!IPPacket->Header) {
     TI_DbgPrint(MIN_TRACE, ("Insufficient resources.\n"));
     (*IPPacket->Free)(IPPacket);
-    return NULL;
+    return FALSE;
   }
 
   /* Copy the header into the buffer */
@@ -243,7 +239,7 @@
     CurrentEntry = CurrentEntry->Flink;
   }
 
-  return IPPacket;
+  return TRUE;
 }
 
 
@@ -289,8 +285,9 @@
   USHORT FragLast;
   BOOLEAN MoreFragments;
   PIPv4_HEADER IPv4Header;
-  PIP_PACKET Datagram;
+  IP_PACKET Datagram;
   PIP_FRAGMENT Fragment;
+  BOOLEAN Success;
 
   /* FIXME: Assume IPv4 */
 
@@ -448,26 +445,29 @@
 
     TI_DbgPrint(DEBUG_IP, ("Complete datagram received.\n"));
 
-    Datagram = ReassembleDatagram(IPDR);
+    /* FIXME: Assumes IPv4 */
+    IPInitializePacket(&Datagram, IP_ADDRESS_V4);
+
+    Success = ReassembleDatagram(&Datagram, IPDR);
 
     RemoveIPDR(IPDR);
     TcpipReleaseSpinLock(&IPDR->Lock, OldIrql);
 
     FreeIPDR(IPDR);
 
-    if (!Datagram)
+    if (!Success)
       /* Not enough free resources, discard the packet */
       return;
 
-    DISPLAY_IP_PACKET(Datagram);
+    DISPLAY_IP_PACKET(&Datagram);
 
     /* Give the packet to the protocol dispatcher */
-    IPDispatchProtocol(IF, Datagram);
+    IPDispatchProtocol(IF, &Datagram);
 
     /* We're done with this datagram */
-    exFreePool(Datagram->Header);
+    exFreePool(Datagram.Header);
     TI_DbgPrint(MAX_TRACE, ("Freeing datagram at (0x%X).\n", Datagram));
-    (*Datagram->Free)(Datagram);
+    (*Datagram.Free)(&Datagram);
   } else
     TcpipReleaseSpinLock(&IPDR->Lock, OldIrql);
 }