1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /*
3 * Copyright (c) 2015-2017 Oracle. All rights reserved.
4 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the BSD-type
10 * license below:
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * Neither the name of the Network Appliance, Inc. nor the names of
25 * its contributors may be used to endorse or promote products
26 * derived from this software without specific prior written
27 * permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 */
41
42 #ifndef _LINUX_SUNRPC_RPC_RDMA_H
43 #define _LINUX_SUNRPC_RPC_RDMA_H
44
45 #include <linux/types.h>
46 #include <linux/bitops.h>
47
48 #define RPCRDMA_VERSION 1
49 #define rpcrdma_version cpu_to_be32(RPCRDMA_VERSION)
50
51 enum {
52 RPCRDMA_V1_DEF_INLINE_SIZE = 1024,
53 };
54
55 /*
56 * XDR sizes, in quads
57 */
58 enum {
59 rpcrdma_fixed_maxsz = 4,
60 rpcrdma_segment_maxsz = 4,
61 rpcrdma_readseg_maxsz = 1 + rpcrdma_segment_maxsz,
62 rpcrdma_readchunk_maxsz = 1 + rpcrdma_readseg_maxsz,
63 };
64
65 /*
66 * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
67 */
68 #define RPCRDMA_HDRLEN_MIN (sizeof(__be32) * 7)
69 #define RPCRDMA_HDRLEN_ERR (sizeof(__be32) * 5)
70
71 enum rpcrdma_errcode {
72 ERR_VERS = 1,
73 ERR_CHUNK = 2
74 };
75
76 enum rpcrdma_proc {
77 RDMA_MSG = 0, /* An RPC call or reply msg */
78 RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */
79 RDMA_MSGP = 2, /* An RPC call or reply msg with padding */
80 RDMA_DONE = 3, /* Client signals reply completion */
81 RDMA_ERROR = 4 /* An RPC RDMA encoding error */
82 };
83
84 #define rdma_msg cpu_to_be32(RDMA_MSG)
85 #define rdma_nomsg cpu_to_be32(RDMA_NOMSG)
86 #define rdma_msgp cpu_to_be32(RDMA_MSGP)
87 #define rdma_done cpu_to_be32(RDMA_DONE)
88 #define rdma_error cpu_to_be32(RDMA_ERROR)
89
90 #define err_vers cpu_to_be32(ERR_VERS)
91 #define err_chunk cpu_to_be32(ERR_CHUNK)
92
93 /*
94 * Private extension to RPC-over-RDMA Version One.
95 * Message passed during RDMA-CM connection set-up.
96 *
97 * Add new fields at the end, and don't permute existing
98 * fields.
99 */
100 struct rpcrdma_connect_private {
101 __be32 cp_magic;
102 u8 cp_version;
103 u8 cp_flags;
104 u8 cp_send_size;
105 u8 cp_recv_size;
106 } __packed;
107
108 #define rpcrdma_cmp_magic __cpu_to_be32(0xf6ab0e18)
109
110 enum {
111 RPCRDMA_CMP_VERSION = 1,
112 RPCRDMA_CMP_F_SND_W_INV_OK = BIT(0),
113 };
114
115 static inline u8
rpcrdma_encode_buffer_size(unsigned int size)116 rpcrdma_encode_buffer_size(unsigned int size)
117 {
118 return (size >> 10) - 1;
119 }
120
121 static inline unsigned int
rpcrdma_decode_buffer_size(u8 val)122 rpcrdma_decode_buffer_size(u8 val)
123 {
124 return ((unsigned int)val + 1) << 10;
125 }
126
127 /**
128 * xdr_encode_rdma_segment - Encode contents of an RDMA segment
129 * @p: Pointer into a send buffer
130 * @handle: The RDMA handle to encode
131 * @length: The RDMA length to encode
132 * @offset: The RDMA offset to encode
133 *
134 * Return value:
135 * Pointer to the XDR position that follows the encoded RDMA segment
136 */
xdr_encode_rdma_segment(__be32 * p,u32 handle,u32 length,u64 offset)137 static inline __be32 *xdr_encode_rdma_segment(__be32 *p, u32 handle,
138 u32 length, u64 offset)
139 {
140 *p++ = cpu_to_be32(handle);
141 *p++ = cpu_to_be32(length);
142 return xdr_encode_hyper(p, offset);
143 }
144
145 /**
146 * xdr_encode_read_segment - Encode contents of a Read segment
147 * @p: Pointer into a send buffer
148 * @position: The position to encode
149 * @handle: The RDMA handle to encode
150 * @length: The RDMA length to encode
151 * @offset: The RDMA offset to encode
152 *
153 * Return value:
154 * Pointer to the XDR position that follows the encoded Read segment
155 */
xdr_encode_read_segment(__be32 * p,u32 position,u32 handle,u32 length,u64 offset)156 static inline __be32 *xdr_encode_read_segment(__be32 *p, u32 position,
157 u32 handle, u32 length,
158 u64 offset)
159 {
160 *p++ = cpu_to_be32(position);
161 return xdr_encode_rdma_segment(p, handle, length, offset);
162 }
163
164 /**
165 * xdr_decode_rdma_segment - Decode contents of an RDMA segment
166 * @p: Pointer to the undecoded RDMA segment
167 * @handle: Upon return, the RDMA handle
168 * @length: Upon return, the RDMA length
169 * @offset: Upon return, the RDMA offset
170 *
171 * Return value:
172 * Pointer to the XDR item that follows the RDMA segment
173 */
xdr_decode_rdma_segment(__be32 * p,u32 * handle,u32 * length,u64 * offset)174 static inline __be32 *xdr_decode_rdma_segment(__be32 *p, u32 *handle,
175 u32 *length, u64 *offset)
176 {
177 *handle = be32_to_cpup(p++);
178 *length = be32_to_cpup(p++);
179 return xdr_decode_hyper(p, offset);
180 }
181
182 /**
183 * xdr_decode_read_segment - Decode contents of a Read segment
184 * @p: Pointer to the undecoded Read segment
185 * @position: Upon return, the segment's position
186 * @handle: Upon return, the RDMA handle
187 * @length: Upon return, the RDMA length
188 * @offset: Upon return, the RDMA offset
189 *
190 * Return value:
191 * Pointer to the XDR item that follows the Read segment
192 */
xdr_decode_read_segment(__be32 * p,u32 * position,u32 * handle,u32 * length,u64 * offset)193 static inline __be32 *xdr_decode_read_segment(__be32 *p, u32 *position,
194 u32 *handle, u32 *length,
195 u64 *offset)
196 {
197 *position = be32_to_cpup(p++);
198 return xdr_decode_rdma_segment(p, handle, length, offset);
199 }
200
201 #endif /* _LINUX_SUNRPC_RPC_RDMA_H */
202