1 /*
2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4
5 /*
6 * This file contains code imported from the OFED rds source file info.c
7 * Oracle elects to have and use the contents of info.c under and governed
8 * by the OpenIB.org BSD license (see below for full license text). However,
9 * the following notice accompanied the original version of this file:
10 */
11
12 /*
13 * Copyright (c) 2006 Oracle. All rights reserved.
14 *
15 * This software is available to you under a choice of one of two
16 * licenses. You may choose to be licensed under the terms of the GNU
17 * General Public License (GPL) Version 2, available from the file
18 * COPYING in the main directory of this source tree, or the
19 * OpenIB.org BSD license below:
20 *
21 * Redistribution and use in source and binary forms, with or
22 * without modification, are permitted provided that the following
23 * conditions are met:
24 *
25 * - Redistributions of source code must retain the above
26 * copyright notice, this list of conditions and the following
27 * disclaimer.
28 *
29 * - Redistributions in binary form must reproduce the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer in the documentation and/or other materials
32 * provided with the distribution.
33 *
34 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
35 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
36 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
37 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
38 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
39 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
40 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
41 * SOFTWARE.
42 *
43 */
44 #include <sys/rds.h>
45
46 #include <sys/ib/clients/rdsv3/rdsv3.h>
47 #include <sys/ib/clients/rdsv3/rdsv3_debug.h>
48
49 /*
50 * This file implements a getsockopt() call which copies a set of fixed
51 * sized structs into a user-specified buffer as a means of providing
52 * read-only information about RDS.
53 *
54 * For a given information source there are a given number of fixed sized
55 * structs at a given time. The structs are only copied if the user-specified
56 * buffer is big enough. The destination pages that make up the buffer
57 * are pinned for the duration of the copy.
58 *
59 * This gives us the following benefits:
60 *
61 * - simple implementation, no copy "position" across multiple calls
62 * - consistent snapshot of an info source
63 * - atomic copy works well with whatever locking info source has
64 * - one portable tool to get rds info across implementations
65 * - long-lived tool can get info without allocating
66 *
67 * at the following costs:
68 *
69 * - info source copy must be pinned, may be "large"
70 */
71
72 static kmutex_t rdsv3_info_lock;
73 static rdsv3_info_func rdsv3_info_funcs[RDS_INFO_LAST - RDS_INFO_FIRST + 1];
74
75 void
rdsv3_info_register_func(int optname,rdsv3_info_func func)76 rdsv3_info_register_func(int optname, rdsv3_info_func func)
77 {
78 int offset = optname - RDS_INFO_FIRST;
79
80 ASSERT(optname >= RDS_INFO_FIRST && optname <= RDS_INFO_LAST);
81
82 mutex_enter(&rdsv3_info_lock);
83 ASSERT(!rdsv3_info_funcs[offset]);
84 rdsv3_info_funcs[offset] = func;
85 mutex_exit(&rdsv3_info_lock);
86 }
87
88 /* ARGSUSED */
89 void
rdsv3_info_deregister_func(int optname,rdsv3_info_func func)90 rdsv3_info_deregister_func(int optname, rdsv3_info_func func)
91 {
92 int offset = optname - RDS_INFO_FIRST;
93
94 ASSERT(optname >= RDS_INFO_FIRST && optname <= RDS_INFO_LAST);
95
96 mutex_enter(&rdsv3_info_lock);
97 rdsv3_info_funcs[offset] = NULL;
98 mutex_exit(&rdsv3_info_lock);
99 }
100
101 /*
102 * @optval points to the userspace buffer that the information snapshot
103 * will be copied into.
104 *
105 * This function returns -errno if there is a failure, particularly -ENOSPC
106 * if the given userspace buffer was not large enough to fit the snapshot.
107 * On success it returns the positive number of bytes of each array element
108 * in the snapshot.
109 */
110 int
rdsv3_info_ioctl(struct rsock * sock,int optname,char * optval,int32_t * rvalp)111 rdsv3_info_ioctl(struct rsock *sock, int optname, char *optval,
112 int32_t *rvalp)
113 {
114 struct rdsv3_info_iterator iter;
115 struct rdsv3_info_lengths lens;
116 rdsv3_info_func func;
117 struct rds_info_arg arg;
118 uint32_t ulen = 0, klen;
119
120 func = rdsv3_info_funcs[optname - RDS_INFO_FIRST];
121 if (func == NULL) {
122 RDSV3_DPRINTF2("rdsv3_info_ioctl",
123 "No Info Function, optname: %d", optname);
124 return (ENOPROTOOPT);
125 }
126
127 if (optval == NULL) {
128 RDSV3_DPRINTF2("rdsv3_info_ioctl", "optval is NULL");
129 return (EINVAL);
130 }
131 if (ddi_copyin(optval, &arg, sizeof (struct rds_info_arg), 0) != 0) {
132 RDSV3_DPRINTF2("rdsv3_info_ioctl",
133 "ddi_copyin for address: 0x%p failed", optval);
134 return (EFAULT);
135 }
136
137 RDSV3_DPRINTF4("rdsv3_info_ioctl",
138 "optname: %d lenp: %llx datap: %llx", optname, arg.lenp, arg.datap);
139
140 if (arg.lenp == NULL) {
141 RDSV3_DPRINTF2("rdsv3_info_ioctl", "arg.lenp is NULL");
142 return (EFAULT);
143 }
144
145 if (ddi_copyin((void *)(uintptr_t)arg.lenp, &ulen,
146 sizeof (uint32_t), 0) != 0) {
147 RDSV3_DPRINTF2("rdsv3_info_ioctl",
148 "ddi_copyin for address, lenp: 0x%p failed", arg.lenp);
149 return (EFAULT);
150 }
151
152 RDSV3_DPRINTF3("rdsv3_info_ioctl", "optname: %d len: %d datap: %p",
153 optname, ulen, arg.datap);
154
155 bzero(&iter, sizeof (struct rdsv3_info_iterator));
156 /* a 0 len call is just trying to probe its length */
157 if (ulen == 0) {
158 iter.addr = NULL;
159 } else if (arg.datap == NULL) {
160 RDSV3_DPRINTF2("rdsv3_info_ioctl",
161 "arg.datap is NULL, ulen set to: %d", ulen);
162 return (EINVAL);
163 } else {
164 iter.addr = (char *)(uintptr_t)arg.datap;
165 }
166 iter.offset = 0;
167
168 bzero(&lens, sizeof (struct rdsv3_info_lengths));
169 func(sock, ulen, &iter, &lens);
170
171 klen = lens.nr * lens.each;
172
173 if (ddi_copyout(&klen, (void *)(uintptr_t)arg.lenp,
174 sizeof (uint32_t), 0) != 0) {
175 RDSV3_DPRINTF2("rdsv3_info_ioctl",
176 "ddi_copyout(%p %p) failed", &klen, arg.lenp);
177 return (EFAULT);
178 }
179
180 RDSV3_DPRINTF3("rdsv3_info_ioctl",
181 "optname: %d ulen: %d klen: %d each: %d", optname, ulen, klen,
182 lens.each);
183
184 if (ulen < klen) {
185 return (ENOSPC);
186 }
187
188 RDSV3_DPRINTF4("rdsv3_info_ioctl", "Return optname: %d", optname);
189
190 *rvalp = lens.each;
191 return (0);
192 }
193