From: "Talpey, Thomas" <Thomas.Talpey@netapp.com>
Subject: [RFC Patch 06/09] NFS/RDMA client - rpcrdma protocol
	definition
Date: Wed, 11 Jul 2007 17:07:46 -0400
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RPCRDMA: Header file with rpcrdma protocol definitions

This file implements the protocol template and constants for the rpcrdma
transport framing, for use by the xprtrdma rpc transport implementation.

Signed-off-by: Tom Talpey <talpey@netapp.com>

---

 rpc_rdma.h |  116 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 116 insertions(+)

Index: linux-2.6.22/include/linux/sunrpc/rpc_rdma.h
===================================================================
--- /dev/null
+++ linux-2.6.22/include/linux/sunrpc/rpc_rdma.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. 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 BSD-type
+ * 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.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_RPC_RDMA_H
+#define _LINUX_SUNRPC_RPC_RDMA_H
+
+struct rpcrdma_segment {
+       uint32_t rs_handle;     /* Registered memory handle */
+       uint32_t rs_length;     /* Length of the chunk in bytes */
+       uint64_t rs_offset;     /* Chunk virtual address or offset */
+};
+
+/*
+ * read chunk(s), encoded as a linked list.
+ */
+struct rpcrdma_read_chunk {
+       uint32_t rc_discrim;    /* 1 indicates presence */
+       uint32_t rc_position;   /* Position in XDR stream */
+       struct rpcrdma_segment rc_target;
+};
+
+/*
+ * write chunk, and reply chunk.
+ */
+struct rpcrdma_write_chunk {
+       struct rpcrdma_segment wc_target;
+};
+
+/*
+ * write chunk(s), encoded as a counted array.
+ */
+struct rpcrdma_write_array {
+       uint32_t wc_discrim;    /* 1 indicates presence */
+       uint32_t wc_nchunks;    /* Array count */
+       struct rpcrdma_write_chunk wc_array[0];
+};
+
+struct rpcrdma_msg {
+       uint32_t rm_xid;        /* Mirrors the RPC header xid */
+       uint32_t rm_vers;       /* Version of this protocol */
+       uint32_t rm_credit;     /* Buffers requested/granted */
+       uint32_t rm_type;       /* Type of message (enum rpcrdma_proc) */
+       union {
+
+               struct {                        /* no chunks */
+                       uint32_t rm_empty[3];   /* 3 empty chunk lists */
+               } rm_nochunks;
+
+               struct {                        /* no chunks and padded */
+                       uint32_t rm_align;      /* Padding alignment */
+                       uint32_t rm_thresh;     /* Padding threshold */
+                       uint32_t rm_pempty[3];  /* 3 empty chunk lists */
+               } rm_padded;
+
+               uint32_t rm_chunks[0];  /* read, write and reply chunks */
+
+       } rm_body;
+};
+
+#define RPCRDMA_HDRLEN_MIN     28
+
+enum rpcrdma_errcode {
+       ERR_VERS = 1,
+       ERR_CHUNK = 2
+};
+
+struct rpcrdma_err_vers {
+       uint32_t rdma_vers_low; /* Version range supported by peer */
+       uint32_t rdma_vers_high;
+};
+
+enum rpcrdma_proc {
+       RDMA_MSG = 0,           /* An RPC call or reply msg */
+       RDMA_NOMSG = 1,         /* An RPC call or reply msg - separate body */
+       RDMA_MSGP = 2,          /* An RPC call or reply msg with padding */
+       RDMA_DONE = 3,          /* Client signals reply completion */
+       RDMA_ERROR = 4          /* An RPC RDMA encoding error */
+};
+
+#endif                         /* _LINUX_SUNRPC_RPC_RDMA_H */


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