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c3a57ed7 TT |
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 | ||
a600ffcb BH |
43 | #include <linux/types.h> |
44 | ||
284f4902 CL |
45 | #define RPCRDMA_VERSION 1 |
46 | #define rpcrdma_version cpu_to_be32(RPCRDMA_VERSION) | |
47 | ||
c3a57ed7 | 48 | struct rpcrdma_segment { |
2d8a9726 AV |
49 | __be32 rs_handle; /* Registered memory handle */ |
50 | __be32 rs_length; /* Length of the chunk in bytes */ | |
51 | __be64 rs_offset; /* Chunk virtual address or offset */ | |
c3a57ed7 TT |
52 | }; |
53 | ||
54 | /* | |
55 | * read chunk(s), encoded as a linked list. | |
56 | */ | |
57 | struct rpcrdma_read_chunk { | |
2d8a9726 AV |
58 | __be32 rc_discrim; /* 1 indicates presence */ |
59 | __be32 rc_position; /* Position in XDR stream */ | |
c3a57ed7 TT |
60 | struct rpcrdma_segment rc_target; |
61 | }; | |
62 | ||
63 | /* | |
64 | * write chunk, and reply chunk. | |
65 | */ | |
66 | struct rpcrdma_write_chunk { | |
67 | struct rpcrdma_segment wc_target; | |
68 | }; | |
69 | ||
70 | /* | |
71 | * write chunk(s), encoded as a counted array. | |
72 | */ | |
73 | struct rpcrdma_write_array { | |
2d8a9726 AV |
74 | __be32 wc_discrim; /* 1 indicates presence */ |
75 | __be32 wc_nchunks; /* Array count */ | |
c3a57ed7 TT |
76 | struct rpcrdma_write_chunk wc_array[0]; |
77 | }; | |
78 | ||
79 | struct rpcrdma_msg { | |
2d8a9726 AV |
80 | __be32 rm_xid; /* Mirrors the RPC header xid */ |
81 | __be32 rm_vers; /* Version of this protocol */ | |
82 | __be32 rm_credit; /* Buffers requested/granted */ | |
83 | __be32 rm_type; /* Type of message (enum rpcrdma_proc) */ | |
c3a57ed7 TT |
84 | union { |
85 | ||
86 | struct { /* no chunks */ | |
2d8a9726 | 87 | __be32 rm_empty[3]; /* 3 empty chunk lists */ |
c3a57ed7 TT |
88 | } rm_nochunks; |
89 | ||
90 | struct { /* no chunks and padded */ | |
2d8a9726 AV |
91 | __be32 rm_align; /* Padding alignment */ |
92 | __be32 rm_thresh; /* Padding threshold */ | |
93 | __be32 rm_pempty[3]; /* 3 empty chunk lists */ | |
c3a57ed7 TT |
94 | } rm_padded; |
95 | ||
2d8a9726 | 96 | __be32 rm_chunks[0]; /* read, write and reply chunks */ |
c3a57ed7 TT |
97 | |
98 | } rm_body; | |
99 | }; | |
100 | ||
f2846481 CL |
101 | /* |
102 | * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks | |
103 | */ | |
104 | #define RPCRDMA_HDRLEN_MIN (sizeof(__be32) * 7) | |
d8647f2d | 105 | #define RPCRDMA_HDRLEN_ERR (sizeof(__be32) * 5) |
c3a57ed7 TT |
106 | |
107 | enum rpcrdma_errcode { | |
108 | ERR_VERS = 1, | |
109 | ERR_CHUNK = 2 | |
110 | }; | |
111 | ||
112 | struct rpcrdma_err_vers { | |
113 | uint32_t rdma_vers_low; /* Version range supported by peer */ | |
114 | uint32_t rdma_vers_high; | |
115 | }; | |
116 | ||
117 | enum rpcrdma_proc { | |
118 | RDMA_MSG = 0, /* An RPC call or reply msg */ | |
119 | RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */ | |
120 | RDMA_MSGP = 2, /* An RPC call or reply msg with padding */ | |
121 | RDMA_DONE = 3, /* Client signals reply completion */ | |
122 | RDMA_ERROR = 4 /* An RPC RDMA encoding error */ | |
123 | }; | |
124 | ||
284f4902 CL |
125 | #define rdma_msg cpu_to_be32(RDMA_MSG) |
126 | #define rdma_nomsg cpu_to_be32(RDMA_NOMSG) | |
127 | #define rdma_msgp cpu_to_be32(RDMA_MSGP) | |
128 | #define rdma_done cpu_to_be32(RDMA_DONE) | |
129 | #define rdma_error cpu_to_be32(RDMA_ERROR) | |
130 | ||
c3a57ed7 | 131 | #endif /* _LINUX_SUNRPC_RPC_RDMA_H */ |