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diff --git a/datapath-windows/ovsext/OvsUser.h b/datapath-windows/ovsext/OvsUser.h
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+/*
+ * Copyright (c) 2014 VMware, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This file contains structures and function definitions necessary for
+ * forwarding packet to user space.
+ */
+
+#ifndef __OVS_USER_H_
+#define __OVS_USER_H_ 1
+
+/*
+ * Even we have more cores, I don't think we need
+ * more than 32 queues for processing packets to
+ * userspace
+ */
+#define OVS_MAX_NUM_PACKET_QUEUES 32
+#define OVS_DEFAULT_PACKET_QUEUE 1
+#define OVS_MAX_PACKET_QUEUE_LEN 4096
+
+/*
+ * Only when OVS_PER_VPORT_QUEUE_CTRL is defined
+ * we will apply this constraint
+ */
+#define OVS_MAX_PACKETS_PER_VPORT 128
+#define OVS_MAX_PACKETS_PER_TUNNEL 1024
+
+typedef struct _OVS_USER_PACKET_QUEUE {
+ UINT32 queueId;
+ UINT32 numPackets;
+ LIST_ENTRY packetList;
+ PVOID instance;
+ PIRP pendingIrp;
+ NDIS_SPIN_LOCK queueLock;
+} OVS_USER_PACKET_QUEUE, *POVS_USER_PACKET_QUEUE;
+
+typedef struct _OVS_PACKET_QUEUE_ELEM {
+ LIST_ENTRY link;
+ OVS_PACKET_HDR_INFO hdrInfo;
+ OVS_PACKET_INFO packet;
+} OVS_PACKET_QUEUE_ELEM, *POVS_PACKET_QUEUE_ELEM;
+
+struct _OVS_OPEN_INSTANCE;
+
+typedef struct _OVS_USER_STATS {
+ UINT64 miss;
+ UINT64 action;
+ UINT32 dropDuetoResource;
+ UINT32 dropDuetoChecksum;
+ UINT32 ipCsum;
+ UINT32 recalTcpCsum;
+ UINT32 vlanInsert;
+ UINT32 l4Csum;
+} OVS_USER_STATS, *POVS_USER_STATS;
+
+
+NTSTATUS OvsUserInit();
+VOID OvsUserCleanup();
+
+VOID OvsCleanupPacketQueue(struct _OVS_OPEN_INSTANCE *instance);
+
+POVS_PACKET_QUEUE_ELEM OvsCreateQueuePacket(UINT32 queueId,
+ PVOID userData,
+ UINT32 userDataLen,
+ UINT32 cmd, UINT32 inPort,
+ OvsIPv4TunnelKey *tunnelKey,
+ PNET_BUFFER_LIST nbl,
+ PNET_BUFFER nb,
+ BOOLEAN isRecv,
+ POVS_PACKET_HDR_INFO hdrInfo);
+
+VOID OvsQueuePackets(UINT32 queueId, PLIST_ENTRY packetList,
+ UINT32 numElems);
+NTSTATUS OvsCreateAndAddPackets(UINT32 queueId,
+ PVOID userData,
+ UINT32 userDataLen,
+ UINT32 cmd,
+ UINT32 inPort,
+ OvsIPv4TunnelKey *tunnelKey,
+ PNET_BUFFER_LIST nbl,
+ BOOLEAN isRecv,
+ POVS_PACKET_HDR_INFO hdrInfo,
+ POVS_SWITCH_CONTEXT switchContext,
+ LIST_ENTRY *list,
+ UINT32 *num);
+
+NTSTATUS OvsSubscribeDpIoctl(PFILE_OBJECT fileObject,
+ PVOID inputBuffer,
+ UINT32 inputLength);
+
+NTSTATUS OvsReadDpIoctl(PFILE_OBJECT fileObject,
+ PVOID outputBuffer,
+ UINT32 outputLength,
+ UINT32 *replyLen);
+NTSTATUS OvsExecuteDpIoctl(PVOID inputBuffer,
+ UINT32 inputLength,
+ UINT32 outputLength);
+NTSTATUS OvsPurgeDpIoctl(PFILE_OBJECT fileObject);
+
+NTSTATUS OvsWaitDpIoctl(PIRP irp, PFILE_OBJECT fileObject);
+
+#endif /* __OVS_USER_H_ */