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_XPRTRDMA_H
41 #define _LINUX_SUNRPC_XPRTRDMA_H
42
43 /*
44 * RPC transport identifier for RDMA
45 */
46 #define XPRT_TRANSPORT_RDMA 256
47
48 /*
49 * rpcbind (v3+) RDMA netid.
50 */
51 #define RPCBIND_NETID_RDMA "rdma"
52
53 /*
54 * Constants. Max RPC/NFS header is big enough to account for
55 * additional marshaling buffers passed down by Linux client.
56 *
57 * RDMA header is currently fixed max size, and is big enough for a
58 * fully-chunked NFS message (read chunks are the largest). Note only
59 * a single chunk type per message is supported currently.
60 */
61 #define RPCRDMA_MIN_SLOT_TABLE (2U)
62 #define RPCRDMA_DEF_SLOT_TABLE (32U)
63 #define RPCRDMA_MAX_SLOT_TABLE (256U)
64
65 #define RPCRDMA_DEF_INLINE (1024) /* default inline max */
66
67 #define RPCRDMA_INLINE_PAD_THRESH (512)/* payload threshold to pad (bytes) */
68
69 #define RDMA_RESOLVE_TIMEOUT (5*HZ) /* TBD 5 seconds */
70 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */
71
72 /* memory registration strategies */
73 #define RPCRDMA_PERSISTENT_REGISTRATION (1)
74
75 enum rpcrdma_memreg {
76 RPCRDMA_BOUNCEBUFFERS = 0,
77 RPCRDMA_REGISTER,
78 RPCRDMA_MEMWINDOWS,
79 RPCRDMA_MEMWINDOWS_ASYNC,
80 RPCRDMA_MTHCAFMR,
81 RPCRDMA_ALLPHYSICAL,
82 RPCRDMA_LAST
83 };
84
85 #endif /* _LINUX_SUNRPC_XPRTRDMA_H */
86
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