diff --git a/include/rdma/ib_pack.h b/include/rdma/ib_pack.h
new file mode 100644
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+++ b/include/rdma/ib_pack.h
@@ -0,0 +1,245 @@
+/*
+ * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: ib_pack.h 1349 2004-12-16 21:09:43Z roland $
+ */
+
+#ifndef IB_PACK_H
+#define IB_PACK_H
+
+#include <rdma/ib_verbs.h>
+
+enum {
+	IB_LRH_BYTES  = 8,
+	IB_GRH_BYTES  = 40,
+	IB_BTH_BYTES  = 12,
+	IB_DETH_BYTES = 8
+};
+
+struct ib_field {
+	size_t struct_offset_bytes;
+	size_t struct_size_bytes;
+	int    offset_words;
+	int    offset_bits;
+	int    size_bits;
+	char  *field_name;
+};
+
+#define RESERVED \
+	.field_name          = "reserved"
+
+/*
+ * This macro cleans up the definitions of constants for BTH opcodes.
+ * It is used to define constants such as IB_OPCODE_UD_SEND_ONLY,
+ * which becomes IB_OPCODE_UD + IB_OPCODE_SEND_ONLY, and this gives
+ * the correct value.
+ *
+ * In short, user code should use the constants defined using the
+ * macro rather than worrying about adding together other constants.
+*/
+#define IB_OPCODE(transport, op) \
+	IB_OPCODE_ ## transport ## _ ## op = \
+		IB_OPCODE_ ## transport + IB_OPCODE_ ## op
+
+enum {
+	/* transport types -- just used to define real constants */
+	IB_OPCODE_RC                                = 0x00,
+	IB_OPCODE_UC                                = 0x20,
+	IB_OPCODE_RD                                = 0x40,
+	IB_OPCODE_UD                                = 0x60,
+
+	/* operations -- just used to define real constants */
+	IB_OPCODE_SEND_FIRST                        = 0x00,
+	IB_OPCODE_SEND_MIDDLE                       = 0x01,
+	IB_OPCODE_SEND_LAST                         = 0x02,
+	IB_OPCODE_SEND_LAST_WITH_IMMEDIATE          = 0x03,
+	IB_OPCODE_SEND_ONLY                         = 0x04,
+	IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE          = 0x05,
+	IB_OPCODE_RDMA_WRITE_FIRST                  = 0x06,
+	IB_OPCODE_RDMA_WRITE_MIDDLE                 = 0x07,
+	IB_OPCODE_RDMA_WRITE_LAST                   = 0x08,
+	IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE    = 0x09,
+	IB_OPCODE_RDMA_WRITE_ONLY                   = 0x0a,
+	IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE    = 0x0b,
+	IB_OPCODE_RDMA_READ_REQUEST                 = 0x0c,
+	IB_OPCODE_RDMA_READ_RESPONSE_FIRST          = 0x0d,
+	IB_OPCODE_RDMA_READ_RESPONSE_MIDDLE         = 0x0e,
+	IB_OPCODE_RDMA_READ_RESPONSE_LAST           = 0x0f,
+	IB_OPCODE_RDMA_READ_RESPONSE_ONLY           = 0x10,
+	IB_OPCODE_ACKNOWLEDGE                       = 0x11,
+	IB_OPCODE_ATOMIC_ACKNOWLEDGE                = 0x12,
+	IB_OPCODE_COMPARE_SWAP                      = 0x13,
+	IB_OPCODE_FETCH_ADD                         = 0x14,
+
+	/* real constants follow -- see comment about above IB_OPCODE()
+	   macro for more details */
+
+	/* RC */
+	IB_OPCODE(RC, SEND_FIRST),
+	IB_OPCODE(RC, SEND_MIDDLE),
+	IB_OPCODE(RC, SEND_LAST),
+	IB_OPCODE(RC, SEND_LAST_WITH_IMMEDIATE),
+	IB_OPCODE(RC, SEND_ONLY),
+	IB_OPCODE(RC, SEND_ONLY_WITH_IMMEDIATE),
+	IB_OPCODE(RC, RDMA_WRITE_FIRST),
+	IB_OPCODE(RC, RDMA_WRITE_MIDDLE),
+	IB_OPCODE(RC, RDMA_WRITE_LAST),
+	IB_OPCODE(RC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
+	IB_OPCODE(RC, RDMA_WRITE_ONLY),
+	IB_OPCODE(RC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
+	IB_OPCODE(RC, RDMA_READ_REQUEST),
+	IB_OPCODE(RC, RDMA_READ_RESPONSE_FIRST),
+	IB_OPCODE(RC, RDMA_READ_RESPONSE_MIDDLE),
+	IB_OPCODE(RC, RDMA_READ_RESPONSE_LAST),
+	IB_OPCODE(RC, RDMA_READ_RESPONSE_ONLY),
+	IB_OPCODE(RC, ACKNOWLEDGE),
+	IB_OPCODE(RC, ATOMIC_ACKNOWLEDGE),
+	IB_OPCODE(RC, COMPARE_SWAP),
+	IB_OPCODE(RC, FETCH_ADD),
+
+	/* UC */
+	IB_OPCODE(UC, SEND_FIRST),
+	IB_OPCODE(UC, SEND_MIDDLE),
+	IB_OPCODE(UC, SEND_LAST),
+	IB_OPCODE(UC, SEND_LAST_WITH_IMMEDIATE),
+	IB_OPCODE(UC, SEND_ONLY),
+	IB_OPCODE(UC, SEND_ONLY_WITH_IMMEDIATE),
+	IB_OPCODE(UC, RDMA_WRITE_FIRST),
+	IB_OPCODE(UC, RDMA_WRITE_MIDDLE),
+	IB_OPCODE(UC, RDMA_WRITE_LAST),
+	IB_OPCODE(UC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
+	IB_OPCODE(UC, RDMA_WRITE_ONLY),
+	IB_OPCODE(UC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
+
+	/* RD */
+	IB_OPCODE(RD, SEND_FIRST),
+	IB_OPCODE(RD, SEND_MIDDLE),
+	IB_OPCODE(RD, SEND_LAST),
+	IB_OPCODE(RD, SEND_LAST_WITH_IMMEDIATE),
+	IB_OPCODE(RD, SEND_ONLY),
+	IB_OPCODE(RD, SEND_ONLY_WITH_IMMEDIATE),
+	IB_OPCODE(RD, RDMA_WRITE_FIRST),
+	IB_OPCODE(RD, RDMA_WRITE_MIDDLE),
+	IB_OPCODE(RD, RDMA_WRITE_LAST),
+	IB_OPCODE(RD, RDMA_WRITE_LAST_WITH_IMMEDIATE),
+	IB_OPCODE(RD, RDMA_WRITE_ONLY),
+	IB_OPCODE(RD, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
+	IB_OPCODE(RD, RDMA_READ_REQUEST),
+	IB_OPCODE(RD, RDMA_READ_RESPONSE_FIRST),
+	IB_OPCODE(RD, RDMA_READ_RESPONSE_MIDDLE),
+	IB_OPCODE(RD, RDMA_READ_RESPONSE_LAST),
+	IB_OPCODE(RD, RDMA_READ_RESPONSE_ONLY),
+	IB_OPCODE(RD, ACKNOWLEDGE),
+	IB_OPCODE(RD, ATOMIC_ACKNOWLEDGE),
+	IB_OPCODE(RD, COMPARE_SWAP),
+	IB_OPCODE(RD, FETCH_ADD),
+
+	/* UD */
+	IB_OPCODE(UD, SEND_ONLY),
+	IB_OPCODE(UD, SEND_ONLY_WITH_IMMEDIATE)
+};
+
+enum {
+	IB_LNH_RAW        = 0,
+	IB_LNH_IP         = 1,
+	IB_LNH_IBA_LOCAL  = 2,
+	IB_LNH_IBA_GLOBAL = 3
+};
+
+struct ib_unpacked_lrh {
+	u8        virtual_lane;
+	u8        link_version;
+	u8        service_level;
+	u8        link_next_header;
+	__be16    destination_lid;
+	__be16    packet_length;
+	__be16    source_lid;
+};
+
+struct ib_unpacked_grh {
+	u8    	     ip_version;
+	u8    	     traffic_class;
+	__be32 	     flow_label;
+	__be16       payload_length;
+	u8    	     next_header;
+	u8    	     hop_limit;
+	union ib_gid source_gid;
+	union ib_gid destination_gid;
+};
+
+struct ib_unpacked_bth {
+	u8           opcode;
+	u8           solicited_event;
+	u8           mig_req;
+	u8           pad_count;
+	u8           transport_header_version;
+	__be16       pkey;
+	__be32       destination_qpn;
+	u8           ack_req;
+	__be32       psn;
+};
+
+struct ib_unpacked_deth {
+	__be32       qkey;
+	__be32       source_qpn;
+};
+
+struct ib_ud_header {
+	struct ib_unpacked_lrh  lrh;
+	int                     grh_present;
+	struct ib_unpacked_grh  grh;
+	struct ib_unpacked_bth  bth;
+	struct ib_unpacked_deth deth;
+	int            		immediate_present;
+	__be32         		immediate_data;
+};
+
+void ib_pack(const struct ib_field        *desc,
+	     int                           desc_len,
+	     void                         *structure,
+	     void                         *buf);
+
+void ib_unpack(const struct ib_field        *desc,
+	       int                           desc_len,
+	       void                         *buf,
+	       void                         *structure);
+
+void ib_ud_header_init(int     		   payload_bytes,
+		       int    		   grh_present,
+		       struct ib_ud_header *header);
+
+int ib_ud_header_pack(struct ib_ud_header *header,
+		      void                *buf);
+
+int ib_ud_header_unpack(void                *buf,
+			struct ib_ud_header *header);
+
+#endif /* IB_PACK_H */