datapath-windows: Added recirculation support.

Recirculation support for the OVS extension.

Tested using PING and iperf with Driver Verifier enabled.

Signed-off-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Co-authored-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Reported-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Reported-at: https://github.com/openvswitch/ovs-issues/issues/104
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

1 files changed, 136 insertions, 0 deletions

diff --git a/datapath-windows/ovsext/Recirc.h b/datapath-windows/ovsext/Recirc.h
new file mode 100644
index 000000000..ee0576347
--- /dev/null
+++ b/datapath-windows/ovsext/Recirc.h
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2016 Cloudbase Solutions Srl
+ *
+ * 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.
+ */
+
+#ifndef __RECIRC_H_
+#define __RECIRC_H_ 1
+
+#include "Actions.h"
+
+#define DEFERRED_ACTION_QUEUE_SIZE          10
+#define DEFERRED_ACTION_EXEC_LEVEL           4
+
+typedef struct _OVS_DEFERRED_ACTION {
+    PNET_BUFFER_LIST    nbl;
+    PNL_ATTR            actions;
+    OvsFlowKey          key;
+} OVS_DEFERRED_ACTION, *POVS_DEFERRED_ACTION;
+
+/*
+ * --------------------------------------------------------------------------
+ * '_OVS_DEFERRED_ACTION_QUEUE' structure is responsible for keeping track of
+ * all deferred actions. The maximum number of deferred actions should not
+ * exceed 'DEFERRED_ACTION_QUEUE_SIZE'.
+ * --------------------------------------------------------------------------
+ */
+typedef struct _OVS_DEFERRED_ACTION_QUEUE {
+    UINT32  head;
+    UINT32  tail;
+    OVS_DEFERRED_ACTION queue[DEFERRED_ACTION_QUEUE_SIZE];
+} OVS_DEFERRED_ACTION_QUEUE, *POVS_DEFERRED_ACTION_QUEUE;
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsProcessDeferredActions --
+ *     This function processes all deferred actions contained in the queue
+ *     corresponding to the current CPU.
+ * --------------------------------------------------------------------------
+ */
+NDIS_STATUS
+OvsProcessDeferredActions(POVS_SWITCH_CONTEXT switchContext,
+                          OvsCompletionList *completionList,
+                          UINT32 portNo,
+                          ULONG sendFlags,
+                          OVS_PACKET_HDR_INFO *layers);
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsAddDeferredActions --
+ *     This function adds the deferred action to the current CPU queue and
+ *     returns the new queue entry if the queue is not already full.
+ * --------------------------------------------------------------------------
+ */
+POVS_DEFERRED_ACTION
+OvsAddDeferredActions(PNET_BUFFER_LIST packet,
+                      OvsFlowKey *key,
+                      const PNL_ATTR actions);
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsQueueAlloc --
+ *     The function allocates per-cpu deferred actions queue.
+ * --------------------------------------------------------------------------
+ */
+BOOLEAN
+OvsDeferredActionsQueueAlloc();
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsQueueFree --
+ *     The function frees per-cpu deferred actions queue.
+ * --------------------------------------------------------------------------
+ */
+VOID
+OvsDeferredActionsQueueFree();
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsLevelAlloc --
+ *     The function allocates per-cpu deferred actions execution level.
+ * --------------------------------------------------------------------------
+ */
+BOOLEAN
+OvsDeferredActionsLevelAlloc();
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsLevelFree --
+ *     The function frees per-cpu deferred actions execution level.
+ * --------------------------------------------------------------------------
+ */
+VOID
+OvsDeferredActionsLevelFree();
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsLevelGet --
+ *     The function returns the deferred action execution level corresponding
+ *     to the current processor.
+ * --------------------------------------------------------------------------
+ */
+UINT32
+OvsDeferredActionsLevelGet();
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsLevelInc --
+ *     The function increments the deferred action execution level
+ *     corresponding to the current processor.
+ * --------------------------------------------------------------------------
+ */
+VOID
+OvsDeferredActionsLevelInc();
+
+/*
+ * --------------------------------------------------------------------------
+ * OvsDeferredActionsLevelDec --
+ *     The function decrements the deferred action execution level
+ *     corresponding to the current processor.
+ * --------------------------------------------------------------------------
+*/
+VOID
+OvsDeferredActionsLevelDec();
+
+#endif /* __RECIRC_H_ */