1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /*
3 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the BSD-type
9 * license below:
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
18 * Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials provided
21 * with the distribution.
22 *
23 * Neither the name of the Network Appliance, Inc. nor the names of
24 * its contributors may be used to endorse or promote products
25 * derived from this software without specific prior written
26 * permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 */
40
41 #ifndef _LINUX_SUNRPC_XPRTRDMA_H
42 #define _LINUX_SUNRPC_XPRTRDMA_H
43
44 /*
45 * Constants. Max RPC/NFS header is big enough to account for
46 * additional marshaling buffers passed down by Linux client.
47 *
48 * RDMA header is currently fixed max size, and is big enough for a
49 * fully-chunked NFS message (read chunks are the largest). Note only
50 * a single chunk type per message is supported currently.
51 */
52 #define RPCRDMA_MIN_SLOT_TABLE (4U)
53 #define RPCRDMA_DEF_SLOT_TABLE (128U)
54 #define RPCRDMA_MAX_SLOT_TABLE (16384U)
55
56 #define RPCRDMA_MIN_INLINE (1024) /* min inline thresh */
57 #define RPCRDMA_DEF_INLINE (4096) /* default inline thresh */
58 #define RPCRDMA_MAX_INLINE (65536) /* max inline thresh */
59
60 /* Memory registration strategies, by number.
61 * This is part of a kernel / user space API. Do not remove. */
62 enum rpcrdma_memreg {
63 RPCRDMA_BOUNCEBUFFERS = 0,
64 RPCRDMA_REGISTER,
65 RPCRDMA_MEMWINDOWS,
66 RPCRDMA_MEMWINDOWS_ASYNC,
67 RPCRDMA_MTHCAFMR,
68 RPCRDMA_FRWR,
69 RPCRDMA_ALLPHYSICAL,
70 RPCRDMA_LAST
71 };
72
73 #endif /* _LINUX_SUNRPC_XPRTRDMA_H */