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Linux kernel mirror (for testing)
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1/*
2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
8 * license below:
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 *
17 * Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
21 *
22 * Neither the name of the Network Appliance, Inc. nor the names of
23 * its contributors may be used to endorse or promote products
24 * derived from this software without specific prior written
25 * permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 */
39
40#ifndef _LINUX_SUNRPC_RPC_RDMA_H
41#define _LINUX_SUNRPC_RPC_RDMA_H
42
43struct rpcrdma_segment {
44 __be32 rs_handle; /* Registered memory handle */
45 __be32 rs_length; /* Length of the chunk in bytes */
46 __be64 rs_offset; /* Chunk virtual address or offset */
47};
48
49/*
50 * read chunk(s), encoded as a linked list.
51 */
52struct rpcrdma_read_chunk {
53 __be32 rc_discrim; /* 1 indicates presence */
54 __be32 rc_position; /* Position in XDR stream */
55 struct rpcrdma_segment rc_target;
56};
57
58/*
59 * write chunk, and reply chunk.
60 */
61struct rpcrdma_write_chunk {
62 struct rpcrdma_segment wc_target;
63};
64
65/*
66 * write chunk(s), encoded as a counted array.
67 */
68struct rpcrdma_write_array {
69 __be32 wc_discrim; /* 1 indicates presence */
70 __be32 wc_nchunks; /* Array count */
71 struct rpcrdma_write_chunk wc_array[0];
72};
73
74struct rpcrdma_msg {
75 __be32 rm_xid; /* Mirrors the RPC header xid */
76 __be32 rm_vers; /* Version of this protocol */
77 __be32 rm_credit; /* Buffers requested/granted */
78 __be32 rm_type; /* Type of message (enum rpcrdma_proc) */
79 union {
80
81 struct { /* no chunks */
82 __be32 rm_empty[3]; /* 3 empty chunk lists */
83 } rm_nochunks;
84
85 struct { /* no chunks and padded */
86 __be32 rm_align; /* Padding alignment */
87 __be32 rm_thresh; /* Padding threshold */
88 __be32 rm_pempty[3]; /* 3 empty chunk lists */
89 } rm_padded;
90
91 __be32 rm_chunks[0]; /* read, write and reply chunks */
92
93 } rm_body;
94};
95
96#define RPCRDMA_HDRLEN_MIN 28
97
98enum rpcrdma_errcode {
99 ERR_VERS = 1,
100 ERR_CHUNK = 2
101};
102
103struct rpcrdma_err_vers {
104 uint32_t rdma_vers_low; /* Version range supported by peer */
105 uint32_t rdma_vers_high;
106};
107
108enum rpcrdma_proc {
109 RDMA_MSG = 0, /* An RPC call or reply msg */
110 RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */
111 RDMA_MSGP = 2, /* An RPC call or reply msg with padding */
112 RDMA_DONE = 3, /* Client signals reply completion */
113 RDMA_ERROR = 4 /* An RPC RDMA encoding error */
114};
115
116#endif /* _LINUX_SUNRPC_RPC_RDMA_H */