From Philip Frey (bug 2443):

Add new dissectors for the iWARP protocol stack.
The code can handle the following 3 protocols:
- MPA
- DDP
- RDMAP

svn path=/trunk/; revision=24931

1 files changed, 891 insertions, 0 deletions

diff --git a/epan/dissectors/packet-iwarp-ddp-rdmap.c b/epan/dissectors/packet-iwarp-ddp-rdmap.c
new file mode 100644
index 0000000000..48a329a948
--- /dev/null
+++ b/epan/dissectors/packet-iwarp-ddp-rdmap.c
@@ -0,0 +1,891 @@
+/* packet-iwarp-ddp-rdmap.c 
+ * Routines for Direct Data Placement (DDP) and
+ * Remote Direct Memory Access Protocol (RDMAP) dissection
+ * According to IETF RFC 5041 and RFC 5040 
+ * Copyright 2008, Yves Geissbuehler <yves.geissbuehler@gmx.net> 
+ * Copyright 2008, Philip Frey <frey.philip@gmail.com> 
+ * 
+ * $Id$ 
+ * 
+ * Wireshark - Network traffic analyzer 
+ * By Gerald Combs <gerald@wireshark.org> 
+ * Copyright 1998 Gerald Combs 
+ * 
+ * This program is free software; you can redistribute it and/or 
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either version 2 
+ * of the License, or (at your option) any later version. 
+ * 
+ * This program is distributed in the hope that it will be useful, 
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * GNU General Public License for more details. 
+ * 
+ * You should have received a copy of the GNU General Public License 
+ * along with this program; if not, write to the Free Software 
+ * Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA. 
+ */
+
+/* INCLUDES */
+#ifdef HAVE_CONFIG_H 
+# include "config.h" 
+#endif
+#include <stdio.h> 
+#include <stdlib.h> 
+#include <string.h> 
+#include <glib.h> 
+#include <epan/packet.h> 
+#include <epan/prefs.h>
+
+/* DEFINES */
+
+/* header field byte lengths */
+#define DDP_CONTROL_FIELD_LEN 1
+#define DDP_TAGGED_HEADER_LEN 14
+#define DDP_TAGGED_RSVDULP_LEN 4
+#define DDP_STAG_LEN 4
+#define DDP_TO_LEN 8
+#define DDP_UNTAGGED_HEADER_LEN 18
+#define DDP_UNTAGGED_RSVDULP_LEN 5
+#define DDP_QN_LEN 4
+#define DDP_MSN_LEN 4
+#define DDP_MO_LEN 4
+#define DDP_BUFFER_MODEL_LEN 12
+
+#define RDMA_CONTROL_FIELD_LEN 1
+#define RDMA_RESERVED_FIELD_LEN 4
+#define RDMA_INVAL_STAG_LEN 4
+#define RDMA_SINKSTAG_LEN 4
+#define RDMA_SINKTO_LEN 8
+#define RDMA_RDMARDSZ_LEN 4
+#define RDMA_SRCSTAG_LEN 4
+#define RDMA_SRCTO_LEN 8
+#define RDMA_DDP_SEGLEN_LEN 2
+#define RDMA_TERMINATED_RDMA_LEN 28
+
+/* RDMA messages */
+#define	RDMA_WRITE 0x00
+#define RDMA_READ_REQUEST 0x01
+#define RDMA_READ_RESPONSE 0x02
+#define RDMA_SEND 0x03
+#define RDMA_SEND_INVALIDATE 0x04
+#define RDMA_SEND_SE 0x05
+#define RDMA_SEND_SE_INVALIDATE 0x06
+#define RDMA_TERMINATE 0x07
+
+/* bitmasks */
+#define	DDP_TAGGED_FLAG 0x80
+#define DDP_LAST_FLAG 0x40
+#define DDP_RSVD 0x3C
+#define DDP_DV 0x03
+#define RDMA_RV 0xC0
+#define RDMA_RSV 0x30
+#define RDMA_OPCODE 0x0F
+
+#define IWARP_LAYER 0xF0
+#define IWARP_ETYPE 0x0F
+#define IWARP_HDRCT 0xE0
+#define IWARP_HDRCT_M 0x80
+#define IWARP_HDRCT_D 0x40
+#define IWARP_HDRCT_R 0x20
+#define IWARP_TERM_RES 0x1FFF
+
+#define IWARP_LAYER_RDMA 0x00
+#define IWARP_LAYER_DDP 0x10
+#define IWARP_LAYER_LLP 0x20
+#define IWARP_ETYPE_DDP_TAGGED 0x01
+#define IWARP_ETYPE_DDP_UNTAGGED 0x02
+
+/* GLOBALS */
+static gint proto_iwarp_ddp_rdmap = -1;
+static gint ett_iwarp_ddp_rdmap = -1;
+
+static dissector_handle_t data_handle;
+
+/*
+ * DDP: initialize the protocol and registered fields
+ */
+static gint hf_iwarp_ddp = -1;
+
+/* DDP Control Field */
+static gint hf_iwarp_ddp_control_field = -1;
+static gint hf_iwarp_ddp_t_flag = -1;
+static gint hf_iwarp_ddp_l_flag = -1;
+static gint hf_iwarp_ddp_rsvd = -1;
+static gint hf_iwarp_ddp_dv = -1;
+
+/* DDP rsvdULP[8:39] field */
+static gint hf_iwarp_ddp_rsvdulp = -1;
+
+/* Tagged Buffer Model Header */
+static gint hf_iwarp_ddp_tagged_header = -1;
+static gint hf_iwarp_ddp_stag = -1;
+static gint hf_iwarp_ddp_to = -1;
+
+/* Untagged Buffer Model Header */
+static gint hf_iwarp_ddp_untagged_header = -1;
+static gint hf_iwarp_ddp_qn= -1;
+static gint hf_iwarp_ddp_msn = -1;
+static gint hf_iwarp_ddp_mo = -1;
+
+/* initialize the subtree pointers */
+static gint ett_iwarp_ddp = -1;
+
+static gint ett_iwarp_ddp_control_field = -1;
+static gint ett_iwarp_ddp_tagged_header = -1;
+static gint ett_iwarp_ddp_untagged_header = -1;
+
+/* 
+ * RDMAP: initialize the protocol and registered fields
+ */
+static gint hf_iwarp_rdma = -1;
+
+/* Control Field */
+static gint hf_iwarp_rdma_control_field = -1;
+static gint hf_iwarp_rdma_version = -1;
+static gint hf_iwarp_rdma_rsvd = -1;
+static gint hf_iwarp_rdma_opcode = -1;
+
+/* DDP rsvdULP[8:39] RDMA interpretations */
+static gint hf_iwarp_rdma_reserved = -1;
+static gint hf_iwarp_rdma_inval_stag = -1;
+
+/* Read Request Header */
+static gint hf_iwarp_rdma_rr_header = -1;
+static gint hf_iwarp_rdma_sinkstag = -1;
+static gint hf_iwarp_rdma_sinkto = -1;
+static gint hf_iwarp_rdma_rdmardsz = -1;
+static gint hf_iwarp_rdma_srcstag = -1;
+static gint hf_iwarp_rdma_srcto = -1;
+
+/* Terminate Header */
+static gint hf_iwarp_rdma_terminate_header = -1;
+static gint hf_iwarp_rdma_term_ctrl = -1;
+static gint hf_iwarp_rdma_term_layer = -1;
+static gint hf_iwarp_rdma_term_etype = -1;
+static gint hf_iwarp_rdma_term_etype_rdma = -1;
+static gint hf_iwarp_rdma_term_etype_ddp = -1;
+static gint hf_iwarp_rdma_term_etype_llp = -1;
+static gint hf_iwarp_rdma_term_errcode = -1;
+static gint hf_iwarp_rdma_term_errcode_rdma = -1;
+static gint hf_iwarp_rdma_term_errcode_ddp_untagged = -1;
+static gint hf_iwarp_rdma_term_errcode_ddp_tagged = -1;
+static gint hf_iwarp_rdma_term_errcode_llp = -1;
+static gint hf_iwarp_rdma_term_hdrct = -1;
+static gint hf_iwarp_rdma_term_hdrct_m = -1;
+static gint hf_iwarp_rdma_term_hdrct_d = -1;
+static gint hf_iwarp_rdma_term_hdrct_r = -1;
+static gint hf_iwarp_rdma_term_rsvd = -1;
+static gint hf_iwarp_rdma_term_ddp_seg_len = -1;
+static gint hf_iwarp_rdma_term_ddp_h = -1;
+static gint hf_iwarp_rdma_term_rdma_h = -1;
+
+/* initialize the subtree pointers */
+static gint ett_iwarp_rdma = -1;
+
+static gint ett_iwarp_rdma_control_field = -1;
+static gint ett_iwarp_rdma_rr_header = -1;
+static gint ett_iwarp_rdma_terminate_header = -1;
+static gint ett_iwarp_rdma_term_ctrl = -1;
+static gint ett_iwarp_rdma_term_hdrct = -1;
+
+static const value_string rdmap_messages[] = {
+		{ RDMA_WRITE, "Write" },
+		{ RDMA_READ_REQUEST, "Read Request" },
+		{ RDMA_READ_RESPONSE, "Read Response" },
+		{ RDMA_SEND, "Send" },
+		{ RDMA_SEND_INVALIDATE, "Send with Invalidate" },
+		{ RDMA_SEND_SE, "Send with SE" },
+		{ RDMA_SEND_SE_INVALIDATE, "Send with SE and Invalidate" },
+		{ RDMA_TERMINATE, "Terminate" },
+		{ 0, NULL	}
+};
+
+static const value_string layer_names[] = {
+		{ IWARP_LAYER_RDMA, "RDMA" },
+		{ IWARP_LAYER_DDP, "DDP" },
+		{ IWARP_LAYER_LLP, "LLP" },
+		{ 0, NULL }
+};
+
+
+static const value_string rdma_etype_names[] = {
+		{ 0x00, "Local Catastrophic Error" },
+		{ 0x01, "Remote Protection Error" },
+		{ 0x02, "Remote Operation Error" },
+		{ 0, NULL }
+};
+
+static const value_string rdma_errcode_names[] = {
+		{ 0x00, "Invalid STag" },
+		{ 0x01, "Base or bounds violation" },
+		{ 0x02, "Access rights violation" },
+		{ 0x03, "STag not associated with RDMAP Stream" },
+		{ 0x04, "TO wrap" },
+		{ 0x05, "Invalid RDMAP version" },
+		{ 0x06, "Unexpected OpCode" },
+		{ 0x07, "Catastrophic error, localized to RDMAP Stream" },
+		{ 0x08, "Catastrophic error, global" },
+		{ 0x09, "STag cannot be Invalidated" },
+		{ 0xFF, "Unspecific Error" },
+		{ 0, NULL }
+};
+
+static const value_string ddp_etype_names[] = {
+		{ 0x00, "Local Catastrophic Error" },
+		{ 0x01, "Tagged Buffer Error" },
+		{ 0x02, "Untagged Buffer Error" },
+		{ 0x03, "Reserved for the use by the LLP" },
+		{ 0, NULL }
+};
+
+static const value_string ddp_errcode_tagged_names[] = {
+		{ 0x00, "Invalid STag" },
+		{ 0x01, "Base or bounds violation" },
+		{ 0x02, "STag not associated with DDP Stream" },
+		{ 0x03, "TO wrap" },
+		{ 0x04, "Invalid DDP version" },
+		{ 0, NULL }
+};
+
+static const value_string ddp_errcode_untagged_names[] = {
+		{ 0x01, "Invalid QN" },
+		{ 0x02, "Invalid MSN - no buffer available" },
+		{ 0x03, "Invalid MSN - MSN range is not valid" },
+		{ 0x04, "Invalid MO" },
+		{ 0x05, "DDP Message too long for available buffer" },
+		{ 0x06, "Invalid DDP version" },
+		{ 0, NULL } 
+};
+
+/* update packet list pane in the GUI */
+void
+ddp_rdma_packetlist(packet_info *pinfo, gboolean ddp_last_flag, 
+		guint8 rdma_msg_opcode)
+{
+	gchar *ddp_fragment_state;
+
+	if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "DDP/RDMA");
+	}
+
+	if (ddp_last_flag) {
+		ddp_fragment_state = "[last DDP segment]";
+	} else {
+		ddp_fragment_state = "[more DDP segments]";
+	}
+
+	if (check_col(pinfo->cinfo, COL_INFO)) {
+		col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d %s %s", pinfo->srcport,
+				pinfo->destport, val_to_str(rdma_msg_opcode, rdmap_messages,
+						"Unknown %d"), ddp_fragment_state);
+	}
+}
+
+/* dissects RDMA Read Request and Terminate message header */
+void
+dissect_iwarp_rdmap(tvbuff_t *tvb, proto_tree *rdma_tree, guint32 offset,
+		guint8 rdma_msg_opcode)
+{
+	proto_tree *rdma_header_tree = NULL;
+	proto_tree *term_ctrl_field_tree = NULL;
+	proto_tree *header_ctrl_field_tree = NULL;
+	
+	proto_item *rdma_header_subitem = NULL;
+	proto_item *term_ctrl_field_subitem = NULL;
+	proto_item *header_ctrl_field_subitem = NULL;
+
+	guint8 layer, etype, hdrct;
+	
+	guint32 rdmardsz;
+
+	if (rdma_tree) {
+		
+		if (rdma_msg_opcode == RDMA_READ_REQUEST) {
+			rdma_header_subitem = proto_tree_add_item(rdma_tree,
+					hf_iwarp_rdma_rr_header, tvb, offset, -1, FALSE);
+			rdma_header_tree = proto_item_add_subtree(rdma_header_subitem,
+					ett_iwarp_rdma);
+
+			proto_tree_add_item(rdma_header_tree, hf_iwarp_rdma_sinkstag, tvb,
+					offset, RDMA_SINKSTAG_LEN, FALSE);
+			offset += RDMA_SINKSTAG_LEN;
+			proto_tree_add_item(rdma_header_tree, hf_iwarp_rdma_sinkto, tvb,
+					offset, RDMA_SINKTO_LEN, FALSE);
+			offset += RDMA_SINKTO_LEN;
+			
+			rdmardsz = (guint32) tvb_get_ntohl(tvb, offset);
+			proto_tree_add_uint_format_value(rdma_header_tree,
+					hf_iwarp_rdma_rdmardsz, tvb, offset,
+					RDMA_RDMARDSZ_LEN, rdmardsz, "%u bytes",
+					rdmardsz);
+			
+			offset += RDMA_RDMARDSZ_LEN;
+			proto_tree_add_item(rdma_header_tree, hf_iwarp_rdma_srcstag, tvb,
+					offset, RDMA_SRCSTAG_LEN, FALSE);
+			offset += RDMA_SRCSTAG_LEN;
+			proto_tree_add_item(rdma_header_tree, hf_iwarp_rdma_srcto, tvb,
+					offset, RDMA_SRCTO_LEN, FALSE);
+			offset += RDMA_SRCTO_LEN;
+		}
+
+		if (rdma_msg_opcode == RDMA_TERMINATE) {
+			rdma_header_subitem = proto_tree_add_item(rdma_tree,
+					hf_iwarp_rdma_terminate_header, tvb, offset, -1, FALSE);
+			rdma_header_tree = proto_item_add_subtree(rdma_header_subitem,
+					ett_iwarp_rdma);
+
+			/* Terminate Control Field */
+			layer = tvb_get_guint8(tvb, offset) & IWARP_LAYER;
+			etype = tvb_get_guint8(tvb, offset) & IWARP_ETYPE;
+
+			term_ctrl_field_subitem = proto_tree_add_item(rdma_tree,
+					hf_iwarp_rdma_term_ctrl, tvb, offset, 3, FALSE);
+			term_ctrl_field_tree = proto_item_add_subtree(
+					term_ctrl_field_subitem, ett_iwarp_rdma);
+			proto_tree_add_item(term_ctrl_field_tree, hf_iwarp_rdma_term_layer,
+					tvb, offset, 1, FALSE);
+
+			switch (layer) {
+				case IWARP_LAYER_RDMA:
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_etype_rdma, tvb, offset, 1,
+							FALSE);
+					offset += 1;
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_errcode_rdma, tvb, offset, 1,
+							FALSE);
+					offset += 1;
+					break;
+				case IWARP_LAYER_DDP:
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_etype_ddp, tvb, offset, 1,
+							FALSE);
+					offset += 1;
+					switch (etype) {
+						case IWARP_ETYPE_DDP_TAGGED:
+							proto_tree_add_item(term_ctrl_field_tree,
+									hf_iwarp_rdma_term_errcode_ddp_tagged, tvb,
+									offset, 1, FALSE);
+							offset += 1;
+							break;
+						case IWARP_ETYPE_DDP_UNTAGGED:
+							proto_tree_add_item(term_ctrl_field_tree,
+									hf_iwarp_rdma_term_errcode_ddp_tagged, tvb,
+									offset, 1, FALSE);
+							offset += 1;
+							break;
+						default:
+							proto_tree_add_item(term_ctrl_field_tree,
+									hf_iwarp_rdma_term_errcode, tvb, offset, 1,
+									FALSE);
+							offset += 1;
+							break;
+					}
+					break;
+				case IWARP_LAYER_LLP:
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_etype_llp, tvb, offset, 1,
+							FALSE);
+					offset += 1;
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_errcode_llp, tvb, offset, 1,
+							FALSE);
+					offset += 1;
+					break;
+				default:
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_etype, tvb, offset, 1, FALSE);
+					offset += 1;
+					proto_tree_add_item(term_ctrl_field_tree,
+							hf_iwarp_rdma_term_errcode, tvb, offset, 1, FALSE);
+					offset += 1;
+					break;
+			}
+
+			/* header control bits (hdctr), part of Terminate Control Field */
+			header_ctrl_field_subitem = proto_tree_add_item(
+					term_ctrl_field_tree, hf_iwarp_rdma_term_hdrct, tvb,
+					offset, 1, FALSE);
+			header_ctrl_field_tree = proto_item_add_subtree(
+					header_ctrl_field_subitem, ett_iwarp_rdma);
+			
+			hdrct = tvb_get_guint8(tvb, offset) & IWARP_HDRCT;
+			
+			proto_tree_add_item(header_ctrl_field_tree,
+					hf_iwarp_rdma_term_hdrct_m, tvb, offset, 1, FALSE);
+			proto_tree_add_item(header_ctrl_field_tree,
+					hf_iwarp_rdma_term_hdrct_d, tvb, offset, 1, FALSE);
+			proto_tree_add_item(header_ctrl_field_tree,
+					hf_iwarp_rdma_term_hdrct_r, tvb, offset, 1, FALSE);
+
+			proto_tree_add_item(rdma_header_tree, hf_iwarp_rdma_term_rsvd, tvb,
+					offset, 2, FALSE);
+			offset += 2;
+
+			
+			if (hdrct & IWARP_HDRCT_D) {
+				/* DDP Segment Length (if any) */
+				proto_tree_add_item(rdma_header_tree,
+						hf_iwarp_rdma_term_ddp_seg_len, tvb,
+						offset, RDMA_DDP_SEGLEN_LEN, FALSE);
+				offset += RDMA_DDP_SEGLEN_LEN;
+				
+				/* Terminated DDP Header (if any), tagged or untagged */
+				if (etype == IWARP_ETYPE_DDP_TAGGED) {
+					proto_tree_add_item(rdma_header_tree,
+							hf_iwarp_rdma_term_ddp_h, tvb,
+							offset, DDP_TAGGED_HEADER_LEN, FALSE);
+					offset += DDP_TAGGED_HEADER_LEN;
+				} else {
+					proto_tree_add_item(rdma_header_tree,
+							hf_iwarp_rdma_term_ddp_h, tvb,
+							offset, DDP_UNTAGGED_HEADER_LEN, FALSE);
+					offset += DDP_UNTAGGED_HEADER_LEN;
+				}
+			}
+
+			/* Terminated RDMA Header (if any) */
+			if (hdrct & IWARP_HDRCT_R) {
+				proto_tree_add_item(rdma_header_tree, hf_iwarp_rdma_term_rdma_h,
+						tvb, offset, RDMA_TERMINATED_RDMA_LEN, FALSE);
+			}
+		}
+	}
+}
+
+/* 
+ * Main dissection routine which dissects a DDP segment and interprets the
+ * header field rsvdULP according to RDMAP.
+ */
+void
+dissect_iwarp_ddp_rdmap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	proto_tree *ddp_rdma_tree = NULL;
+	proto_tree *ddp_tree = NULL;
+	proto_tree *ddp_ctrl_field_tree = NULL;
+	proto_tree *ddp_buffer_model_tree = NULL;
+	proto_tree *rdma_tree = NULL;
+	proto_tree *rdma_ctrl_field_tree = NULL;
+
+	proto_item *ddp_rdma_item = NULL;
+	proto_item *ddp_item = NULL;
+	proto_item *ddp_ctrl_field_item = NULL;
+	proto_item *ddp_buffer_model_item = NULL;
+	proto_item *rdma_item = NULL;
+	proto_item *rdma_ctrl_field_item = NULL;
+
+	tvbuff_t *next_tvb = NULL;
+	
+	gboolean is_tagged_buffer_model;
+	guint8 ddp_ctrl_field, rdma_ctrl_field, rdma_msg_opcode;
+	guint32 header_end;
+	guint32 offset = 0;
+
+	ddp_ctrl_field = tvb_get_guint8(tvb, 0);
+	rdma_ctrl_field = tvb_get_guint8(tvb, 1);
+	rdma_msg_opcode = rdma_ctrl_field & RDMA_OPCODE;
+	is_tagged_buffer_model = ddp_ctrl_field & DDP_TAGGED_FLAG;
+
+	ddp_rdma_packetlist(pinfo, ddp_ctrl_field & DDP_LAST_FLAG, rdma_msg_opcode);
+	
+	if (tree) {
+		
+		offset = 0;
+		
+		/* determine header length */
+		if (is_tagged_buffer_model) {
+			header_end = DDP_TAGGED_HEADER_LEN;
+		} else {
+			header_end = DDP_UNTAGGED_HEADER_LEN;
+		}
+		
+		if (rdma_msg_opcode == RDMA_READ_REQUEST
+				|| rdma_msg_opcode == RDMA_TERMINATE) {
+			header_end = -1;
+		}
+		
+		/* DDP/RDMA protocol tree */
+		ddp_rdma_item = proto_tree_add_item(tree, proto_iwarp_ddp_rdmap,
+				tvb, offset, header_end, FALSE);
+		ddp_rdma_tree = proto_item_add_subtree(ddp_rdma_item,
+				ett_iwarp_ddp_rdmap);
+
+		/* DDP protocol header subtree */	
+		ddp_item = proto_tree_add_item(ddp_rdma_tree, hf_iwarp_ddp, tvb,
+				offset, header_end, FALSE);
+		ddp_tree = proto_item_add_subtree(ddp_item, ett_iwarp_ddp);
+
+		/* DDP control field */
+		ddp_ctrl_field_item = proto_tree_add_item(ddp_tree,
+				hf_iwarp_ddp_control_field, tvb, offset,
+				DDP_CONTROL_FIELD_LEN, FALSE);
+		ddp_ctrl_field_tree = proto_item_add_subtree(ddp_ctrl_field_item,
+				ett_iwarp_ddp);
+		
+		proto_tree_add_item(ddp_ctrl_field_tree, hf_iwarp_ddp_t_flag, tvb,
+				offset, DDP_CONTROL_FIELD_LEN, FALSE);
+		proto_tree_add_item(ddp_ctrl_field_tree, hf_iwarp_ddp_l_flag, tvb,
+				offset, DDP_CONTROL_FIELD_LEN, FALSE);
+		proto_tree_add_item(ddp_ctrl_field_tree, hf_iwarp_ddp_rsvd, tvb,
+				offset, DDP_CONTROL_FIELD_LEN, FALSE);
+		proto_tree_add_item(ddp_ctrl_field_tree, hf_iwarp_ddp_dv, tvb, offset,
+				DDP_CONTROL_FIELD_LEN, FALSE);
+		offset += DDP_CONTROL_FIELD_LEN;
+		
+		
+		/* DDP header field RsvdULP */
+		if (!is_tagged_buffer_model) {
+			proto_tree_add_item(ddp_tree, hf_iwarp_ddp_rsvdulp, tvb,
+					offset, DDP_UNTAGGED_RSVDULP_LEN, FALSE);
+		}
+		
+		/* RDMA protocol header subtree */
+		if (is_tagged_buffer_model) {
+			header_end = RDMA_CONTROL_FIELD_LEN;
+		} else {
+			header_end = RDMA_CONTROL_FIELD_LEN + RDMA_RESERVED_FIELD_LEN;
+		}
+		
+		rdma_item = proto_tree_add_item(ddp_rdma_tree, hf_iwarp_rdma, tvb,
+					offset, header_end, FALSE);
+		rdma_tree = proto_item_add_subtree(rdma_item, ett_iwarp_rdma);
+
+		/* RDMA Control Field */
+		rdma_ctrl_field_item = proto_tree_add_item(rdma_tree,
+				hf_iwarp_rdma_control_field, tvb, offset,
+				RDMA_CONTROL_FIELD_LEN, FALSE);
+		rdma_ctrl_field_tree = proto_item_add_subtree(rdma_ctrl_field_item,
+				ett_iwarp_rdma);
+		
+		proto_tree_add_item(rdma_ctrl_field_tree, hf_iwarp_rdma_version, tvb,
+				offset, RDMA_CONTROL_FIELD_LEN, FALSE);
+		proto_tree_add_item(rdma_ctrl_field_tree, hf_iwarp_rdma_rsvd, tvb,
+				offset, RDMA_CONTROL_FIELD_LEN, FALSE);
+		proto_tree_add_item(rdma_ctrl_field_tree, hf_iwarp_rdma_opcode, tvb,
+				offset, RDMA_CONTROL_FIELD_LEN, FALSE);
+		offset += RDMA_CONTROL_FIELD_LEN;
+		
+		/* dissection of DDP rsvdULP[8:39] with respect to RDMAP */
+		if (rdma_msg_opcode == RDMA_READ_REQUEST
+				|| rdma_msg_opcode == RDMA_SEND
+				|| rdma_msg_opcode == RDMA_SEND_SE
+				|| rdma_msg_opcode == RDMA_TERMINATE) {
+			proto_tree_add_item(rdma_tree, hf_iwarp_rdma_reserved,
+				 tvb, offset, RDMA_RESERVED_FIELD_LEN, FALSE);
+		}
+		
+		if (rdma_msg_opcode == RDMA_SEND_INVALIDATE
+				|| rdma_msg_opcode == RDMA_SEND_SE_INVALIDATE) {
+			proto_tree_add_item(rdma_tree, hf_iwarp_rdma_inval_stag,
+				tvb, offset, RDMA_INVAL_STAG_LEN, FALSE);
+		}
+		
+		if (!is_tagged_buffer_model) {
+			offset += RDMA_RESERVED_FIELD_LEN;
+		}
+
+		/* DDP Buffer Model dissection */
+		if (is_tagged_buffer_model) {
+
+			/* Tagged Buffer Model Case */
+			ddp_buffer_model_item = proto_tree_add_item(ddp_tree,
+					hf_iwarp_ddp_tagged_header, tvb, offset,
+					DDP_BUFFER_MODEL_LEN, FALSE);
+			ddp_buffer_model_tree = proto_item_add_subtree(ddp_buffer_model_item,
+					ett_iwarp_ddp);
+
+			proto_tree_add_item(ddp_buffer_model_tree, hf_iwarp_ddp_stag, tvb,
+					offset, DDP_STAG_LEN, FALSE);
+			offset += DDP_STAG_LEN;
+			proto_tree_add_item(ddp_buffer_model_tree, hf_iwarp_ddp_to, tvb,
+					offset, DDP_TO_LEN, FALSE);
+			offset += DDP_TO_LEN;
+			
+			if( rdma_msg_opcode == RDMA_READ_RESPONSE
+					|| rdma_msg_opcode == RDMA_WRITE) {
+				
+				/* display the payload */
+				next_tvb = tvb_new_subset(tvb, DDP_TAGGED_HEADER_LEN, -1, -1);
+				call_dissector(data_handle, next_tvb, pinfo, tree);
+			}
+			
+		} else {
+			
+			/* Untagged Buffer Model Case */
+			ddp_buffer_model_item = proto_tree_add_item(ddp_tree,
+					hf_iwarp_ddp_untagged_header, tvb, offset,
+					DDP_BUFFER_MODEL_LEN, FALSE);
+			ddp_buffer_model_tree = proto_item_add_subtree(ddp_buffer_model_item,
+					ett_iwarp_ddp);
+
+			proto_tree_add_item(ddp_buffer_model_tree, hf_iwarp_ddp_qn, tvb,
+					offset, DDP_QN_LEN, FALSE);
+			offset += DDP_QN_LEN;
+			proto_tree_add_item(ddp_buffer_model_tree, hf_iwarp_ddp_msn, tvb,
+					offset, DDP_MSN_LEN, FALSE);
+			offset += DDP_MSN_LEN;
+			proto_tree_add_item(ddp_buffer_model_tree, hf_iwarp_ddp_mo, tvb,
+					offset, DDP_MO_LEN, FALSE);
+			offset += DDP_MO_LEN;
+			
+			if (rdma_msg_opcode == RDMA_SEND
+					|| rdma_msg_opcode == RDMA_SEND_INVALIDATE
+					|| rdma_msg_opcode == RDMA_SEND_SE
+					|| rdma_msg_opcode == RDMA_SEND_SE_INVALIDATE) {
+
+				/* display the payload */
+				next_tvb = tvb_new_subset(tvb, DDP_UNTAGGED_HEADER_LEN, -1, -1);
+				call_dissector(data_handle, next_tvb, pinfo, tree);
+			}
+		}
+	}
+
+	/* do further dissection for RDMA messages RDMA Read Request & Terminate */
+	if (rdma_msg_opcode == RDMA_READ_REQUEST
+			|| rdma_msg_opcode == RDMA_TERMINATE) {
+		dissect_iwarp_rdmap(tvb, rdma_tree, offset, rdma_msg_opcode);
+	}
+}
+
+/* register the protocol with Wireshark */
+void
+proto_register_iwarp_ddp_rdmap(void)
+{
+	/* setup list of header fields */
+	static hf_register_info hf[] = {
+
+		/* DDP */
+		{ &hf_iwarp_ddp, {
+				"DDP header", "iwarp_ddp",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				NULL, HFILL } },
+		{ &hf_iwarp_ddp_control_field, {
+				"DDP control field", "iwarp_ddp.control_field",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"DDP Control Field", HFILL } },
+		{ &hf_iwarp_ddp_tagged_header, {
+				"Tagged buffer model", "iwarp_ddp.tagged",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"DDP Tagged Buffer Model Header", HFILL} },
+		{ &hf_iwarp_ddp_untagged_header, {
+				"Untagged buffer model", "iwarp_ddp.untagged",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"DDP Untagged Buffer Model Header", HFILL} },
+		{ &hf_iwarp_ddp_t_flag, {
+				"Tagged flag", "iwarp_ddp.tagged_flag",
+				FT_BOOLEAN, 8, NULL, DDP_TAGGED_FLAG,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_l_flag, {
+				"Last flag", "iwarp_ddp.last_flag",
+				FT_BOOLEAN, 8, NULL, DDP_LAST_FLAG,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_rsvd, {
+				"Reserved", "iwarp_ddp.rsvd",
+				FT_UINT8, BASE_HEX, NULL, DDP_RSVD,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_dv, {
+				"DDP protocol version", "iwarp_ddp.dv",
+				FT_UINT8, BASE_DEC, NULL, DDP_DV,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_rsvdulp, {
+				"Reserved for use by the ULP", "iwarp_ddp.rsvdulp",
+				FT_BYTES, BASE_HEX, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_stag, {
+				"(Data Sink) Steering Tag", "iwarp_ddp.stag",
+				FT_BYTES, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_to, {
+				"(Data Sink) Tagged offset", "iwarp_ddp.tagged_offset",
+				FT_BYTES, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_qn, {
+				"Queue number", "iwarp_ddp.qn",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_msn, {
+				"Message sequence number", "iwarp_ddp.msn",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_ddp_mo, {
+				"Message offset", "iwarp_ddp.mo",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				NULL, HFILL}
+		},
+
+		/* RDMAP */
+		{ &hf_iwarp_rdma, {
+				"RDMAP header", "iwarp_rdma",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_control_field, {
+				"RDMAP control field", "iwarp_rdma.control_field",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"RDMA Control Field", HFILL} },
+		{ &hf_iwarp_rdma_version, {
+				"Version", "iwarp_rdma.version",
+				FT_UINT8, BASE_DEC, NULL, RDMA_RV,
+				"RDMA Version Field", HFILL} },
+		{ &hf_iwarp_rdma_rsvd, {
+				"Reserved", "iwarp_rdma.rsv",
+				FT_UINT8, BASE_HEX, NULL, RDMA_RSV,
+				"RDMA Control Field Reserved", HFILL} },
+		{ &hf_iwarp_rdma_opcode, {
+				"OpCode", "iwarp_rdma.opcode",
+				FT_UINT8, BASE_HEX, VALS(rdmap_messages), RDMA_OPCODE,
+				"RDMA OpCode Field", HFILL} },
+		{ &hf_iwarp_rdma_reserved, {
+				"Reserved", "iwarp_rdma.reserved",
+				FT_BYTES, BASE_HEX, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_inval_stag, {
+				"Invalidate STag", "iwarp_rdma.inval_stag",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				"RDMA Invalidate STag", HFILL} },
+		{ &hf_iwarp_rdma_rr_header, {
+				"Read request", "iwarp_rdma.rr",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"RDMA Read Request Header", HFILL} },
+		{ &hf_iwarp_rdma_terminate_header, {
+				"Terminate", "iwarp_rdma.terminate",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"RDMA Terminate Header", HFILL} },
+		{ &hf_iwarp_rdma_sinkstag, {
+				"Data Sink STag", "iwarp_rdma.sinkstag",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_sinkto, {
+				"Data Sink Tagged Offset", "iwarp_rdma.sinkto",
+				FT_UINT64, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_rdmardsz, {
+				"RDMA Read Message Size", "iwarp_rdma.rdmardsz",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_srcstag, {
+				"Data Source STag", "iwarp_rdma.srcstag",
+				FT_UINT32, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_srcto, {
+				"Data Source Tagged Offset", "iwarp_rdma.srcto",
+				FT_BYTES, BASE_DEC, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_term_ctrl, {
+				"Terminate Control", "iwarp_rdma.term_ctrl",
+				FT_NONE, BASE_NONE, NULL, 0x0,
+				"RDMA Terminate Control Field", HFILL} },
+		{ &hf_iwarp_rdma_term_layer, {
+				"Layer", "iwarp_rdma.term_layer",
+				FT_UINT8, BASE_HEX, VALS(layer_names), IWARP_LAYER,
+				"Terminate Control Field: Layer", HFILL} },
+		{ &hf_iwarp_rdma_term_etype_rdma, {
+				"Error Types for RDMA layer", "iwarp_rdma.term_etype_rdma",
+				FT_UINT8, BASE_HEX, VALS(rdma_etype_names), IWARP_ETYPE,
+				"Terminate Control Field: Error Type", HFILL} },
+		{ &hf_iwarp_rdma_term_etype_ddp, {
+				"Error Types for DDP layer", "iwarp_rdma.term_etype_ddp",
+				FT_UINT8, BASE_HEX, VALS(ddp_etype_names), IWARP_ETYPE,
+				"Terminate Control Field: Error Type", HFILL} },
+		{ &hf_iwarp_rdma_term_etype_llp, {
+				"Error Types for LLP layer", "iwarp_rdma.term_etype_llp",
+				FT_UINT8, BASE_HEX, NULL, IWARP_ETYPE,
+				"Terminate Control Field: Error Type", HFILL} },
+		{ &hf_iwarp_rdma_term_etype, {
+				"Error Types", "iwarp_rdma.term_etype",
+				FT_UINT8, BASE_HEX, NULL, IWARP_ETYPE,
+				"Terminate Control Field: Error Type", HFILL} },
+		{ &hf_iwarp_rdma_term_errcode_rdma, {
+				"Error Code for RDMA layer", "iwarp_rdma.term_errcode_rdma",
+				FT_UINT8, BASE_HEX, VALS(rdma_errcode_names), 0x0,
+				"Terminate Control Field: Error Code", HFILL} },
+		{ &hf_iwarp_rdma_term_errcode_ddp_tagged, {
+				"Error Code for DDP Tagged Buffer",
+				"iwarp_rdma.term_errcode_ddp_tagged",
+				FT_UINT8, BASE_HEX, VALS(ddp_errcode_tagged_names), 0x0,
+				"Terminate Control Field: Error Code", HFILL} },
+		{ &hf_iwarp_rdma_term_errcode_ddp_untagged, {
+				"Error Code for DDP Untagged Buffer",
+				"iwarp_rdma.term_errcode_ddp_untagged",
+				FT_UINT8, BASE_HEX, VALS(ddp_errcode_untagged_names), 0x0,
+				"Terminate Control Field: Error Code", HFILL} },
+		{ &hf_iwarp_rdma_term_errcode, {
+				"Error Code", "iwarp_rdma.term_errcode",
+				FT_UINT8, BASE_HEX, NULL, 0x0,
+				"Terminate Control Field: Error Code", HFILL} },
+		{ &hf_iwarp_rdma_term_hdrct, {
+				"Header control bits", "iwarp_rdma.term_hdrct",
+				FT_NONE, BASE_NONE, NULL, IWARP_HDRCT,
+				"Terminate Control Field: Header control bits", HFILL} },
+		{ &hf_iwarp_rdma_term_hdrct_m, {
+				"M bit", "iwarp_rdma.term_hdrct_m",
+				FT_UINT8, BASE_HEX, NULL, IWARP_HDRCT_M,
+				"Header control bit m: DDP Segment Length valid", HFILL} },
+		{ &hf_iwarp_rdma_term_hdrct_d, {
+				"D bit", "iwarp_rdma.hdrct_d",
+				FT_UINT8, BASE_HEX, NULL, IWARP_HDRCT_D,
+				"Header control bit d: DDP Header Included", HFILL} },
+		{ &hf_iwarp_rdma_term_hdrct_r, {
+				"R bit", "iwarp_rdma.hdrct_r",
+				FT_UINT8, BASE_HEX, NULL, IWARP_HDRCT_R,
+				"Header control bit r: RDMAP Header Included", HFILL} },
+		{ &hf_iwarp_rdma_term_rsvd, {
+				"Reserved", "iwarp_rdma.term_rsvd",
+				FT_UINT16, BASE_HEX, NULL, IWARP_TERM_RES,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_term_ddp_seg_len, {
+				"DDP Segment Length", "iwarp_rdma.term_ddp_seg_len",
+				FT_BYTES, BASE_HEX, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_term_ddp_h, {
+				"Terminated DDP Header", "iwarp_rdma.term_ddp_h",
+				FT_BYTES, BASE_HEX, NULL, 0x0,
+				NULL, HFILL} },
+		{ &hf_iwarp_rdma_term_rdma_h, {
+				"Terminated RDMA Header", "iwarp_rdma.term_rdma_h",
+				FT_BYTES, BASE_HEX, NULL, 0x0,
+				NULL, HFILL} }
+	};
+
+	/* setup protocol subtree array */
+	static gint *ett[] = {
+
+		&ett_iwarp_ddp_rdmap,
+		
+		/* DDP */
+		&ett_iwarp_ddp,
+
+		&ett_iwarp_ddp_control_field,
+		&ett_iwarp_ddp_tagged_header,
+		&ett_iwarp_ddp_untagged_header,
+		
+		/* RDMAP */
+		&ett_iwarp_rdma,
+		
+		&ett_iwarp_rdma_control_field,
+		&ett_iwarp_rdma_rr_header,
+		&ett_iwarp_rdma_terminate_header,
+		&ett_iwarp_rdma_term_ctrl,
+		&ett_iwarp_rdma_term_hdrct
+	};
+
+	/* register the protocol name and description */
+	proto_iwarp_ddp_rdmap = proto_register_protocol(
+		"iWARP Direct Data Placement and Remote Direct Memory Access Protocol",
+		"IWARP_DDP_RDMAP",
+		"iwarp_ddp_rdmap");
+
+	/* required function calls to register the header fields and subtrees */
+	proto_register_field_array(proto_iwarp_ddp_rdmap, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	register_dissector("iwarp_ddp_rdmap", dissect_iwarp_ddp_rdmap,
+			proto_iwarp_ddp_rdmap);
+}
+
+void
+proto_reg_handoff_iwarp_ddp_rdmap(void)
+{
+	data_handle = find_dissector("data");
+}