datapath-windows: Stateless TCP Tunnelling protocol - Initial implementation

This change include an initial implementable of STT.

The following should be added:
[1] Checksum offload (SW and HW)
[2] LSO (SW and HW)
[3] IP layer WFP callout for IP segments

Added support for multiple (per TCP port) STT ports

Testing: link layer connection through ping works. File transfer.

Signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Co-authored-by: Saurabh Shah <ssaurabh@vmware.com>
Signed-off-by: Saurabh Shah <ssaurabh@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/datapath-windows/ovsext/Stt.h b/datapath-windows/ovsext/Stt.h
new file mode 100644
index 000000000..38d721c49
--- /dev/null
+++ b/datapath-windows/ovsext/Stt.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2015 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.
+ */
+
+#ifndef __OVS_STT_H_
+#define __OVS_STT_H_ 1
+
+#define STT_TCP_PORT 7471
+#define STT_TCP_PORT_NBO 0x2f1d
+
+#define MAX_IP_TOTAL_LEN 65535
+
+// STT defines.
+#define STT_SEQ_LEN_SHIFT 16
+#define STT_SEQ_OFFSET_MASK ((1 << STT_SEQ_LEN_SHIFT) - 1)
+#define STT_FRAME_LEN(seq) ((seq) >> STT_SEQ_LEN_SHIFT)
+#define STT_SEGMENT_OFF(seq) ((seq) & STT_SEQ_OFFSET_MASK)
+
+#define STT_CSUM_VERIFIED   (1 << 0)
+#define STT_CSUM_PARTIAL    (1 << 1)
+#define STT_PROTO_IPV4      (1 << 2)
+#define STT_PROTO_TCP       (1 << 3)
+#define STT_PROTO_TYPES     (STT_PROTO_IPV4 | STT_PROTO_TCP)
+
+#define STT_ETH_PAD 2
+typedef struct SttHdr {
+    UINT8    version;
+    UINT8    flags;
+    UINT8    l4Offset;
+    UINT8    reserved;
+    UINT16   mss;
+    UINT16   vlanTCI;
+    UINT64   key;
+} SttHdr, *PSttHdr;
+
+#define STT_HDR_LEN (sizeof(SttHdr) + STT_ETH_PAD)
+
+typedef struct _OVS_STT_VPORT {
+    UINT16 dstPort;
+    UINT64 ackNo;
+    UINT64 ipId;
+
+    UINT64 inPkts;
+    UINT64 outPkts;
+    UINT64 slowInPkts;
+    UINT64 slowOutPkts;
+} OVS_STT_VPORT, *POVS_STT_VPORT;
+
+NTSTATUS OvsInitSttTunnel(POVS_VPORT_ENTRY vport,
+                          UINT16 udpDestPort);
+
+VOID OvsCleanupSttTunnel(POVS_VPORT_ENTRY vport);
+
+
+void OvsCleanupSttTunnel(POVS_VPORT_ENTRY vport);
+
+NDIS_STATUS OvsEncapStt(POVS_VPORT_ENTRY vport,
+                        PNET_BUFFER_LIST curNbl,
+                        OvsIPv4TunnelKey *tunKey,
+                        POVS_SWITCH_CONTEXT switchContext,
+                        POVS_PACKET_HDR_INFO layers,
+                        PNET_BUFFER_LIST *newNbl);
+
+
+NDIS_STATUS OvsDecapStt(POVS_SWITCH_CONTEXT switchContext,
+                        PNET_BUFFER_LIST curNbl,
+                        OvsIPv4TunnelKey *tunKey,
+                        PNET_BUFFER_LIST *newNbl);
+
+static __inline UINT32
+OvsGetSttTunHdrSize(VOID)
+{
+    return sizeof (EthHdr) + sizeof(IPHdr) + sizeof(TCPHdr) +
+                  STT_HDR_LEN;
+}
+
+#endif /*__OVS_STT_H_ */