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1/*
2 * Copyright (c) 2006, 2017 Oracle and/or its affiliates. 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
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * 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
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/in.h>
36#include <linux/ipv6.h>
37
38#include "rds.h"
39#include "loop.h"
40
41static struct rds_transport *transports[RDS_TRANS_COUNT];
42static DECLARE_RWSEM(rds_trans_sem);
43
44void rds_trans_register(struct rds_transport *trans)
45{
46 BUG_ON(strlen(trans->t_name) + 1 > TRANSNAMSIZ);
47
48 down_write(&rds_trans_sem);
49
50 if (transports[trans->t_type])
51 printk(KERN_ERR "RDS Transport type %d already registered\n",
52 trans->t_type);
53 else {
54 transports[trans->t_type] = trans;
55 printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name);
56 }
57
58 up_write(&rds_trans_sem);
59}
60EXPORT_SYMBOL_GPL(rds_trans_register);
61
62void rds_trans_unregister(struct rds_transport *trans)
63{
64 down_write(&rds_trans_sem);
65
66 transports[trans->t_type] = NULL;
67 printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name);
68
69 up_write(&rds_trans_sem);
70}
71EXPORT_SYMBOL_GPL(rds_trans_unregister);
72
73void rds_trans_put(struct rds_transport *trans)
74{
75 if (trans)
76 module_put(trans->t_owner);
77}
78
79struct rds_transport *rds_trans_get_preferred(struct net *net,
80 const struct in6_addr *addr,
81 __u32 scope_id)
82{
83 struct rds_transport *ret = NULL;
84 struct rds_transport *trans;
85 unsigned int i;
86
87 if (ipv6_addr_v4mapped(addr)) {
88 if (*(u_int8_t *)&addr->s6_addr32[3] == IN_LOOPBACKNET)
89 return &rds_loop_transport;
90 } else if (ipv6_addr_loopback(addr)) {
91 return &rds_loop_transport;
92 }
93
94 down_read(&rds_trans_sem);
95 for (i = 0; i < RDS_TRANS_COUNT; i++) {
96 trans = transports[i];
97
98 if (trans && (trans->laddr_check(net, addr, scope_id) == 0) &&
99 (!trans->t_owner || try_module_get(trans->t_owner))) {
100 ret = trans;
101 break;
102 }
103 }
104 up_read(&rds_trans_sem);
105
106 return ret;
107}
108
109struct rds_transport *rds_trans_get(int t_type)
110{
111 struct rds_transport *ret = NULL;
112 struct rds_transport *trans;
113 unsigned int i;
114
115 down_read(&rds_trans_sem);
116 for (i = 0; i < RDS_TRANS_COUNT; i++) {
117 trans = transports[i];
118
119 if (trans && trans->t_type == t_type &&
120 (!trans->t_owner || try_module_get(trans->t_owner))) {
121 ret = trans;
122 break;
123 }
124 }
125 up_read(&rds_trans_sem);
126
127 return ret;
128}
129
130/*
131 * This returns the number of stats entries in the snapshot and only
132 * copies them using the iter if there is enough space for them. The
133 * caller passes in the global stats so that we can size and copy while
134 * holding the lock.
135 */
136unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
137 unsigned int avail)
138
139{
140 struct rds_transport *trans;
141 unsigned int total = 0;
142 unsigned int part;
143 int i;
144
145 rds_info_iter_unmap(iter);
146 down_read(&rds_trans_sem);
147
148 for (i = 0; i < RDS_TRANS_COUNT; i++) {
149 trans = transports[i];
150 if (!trans || !trans->stats_info_copy)
151 continue;
152
153 part = trans->stats_info_copy(iter, avail);
154 avail -= min(avail, part);
155 total += part;
156 }
157
158 up_read(&rds_trans_sem);
159
160 return total;
161}
1/*
2 * Copyright (c) 2006 Oracle. 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
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * 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
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/in.h>
36
37#include "rds.h"
38#include "loop.h"
39
40static struct rds_transport *transports[RDS_TRANS_COUNT];
41static DECLARE_RWSEM(rds_trans_sem);
42
43void rds_trans_register(struct rds_transport *trans)
44{
45 BUG_ON(strlen(trans->t_name) + 1 > TRANSNAMSIZ);
46
47 down_write(&rds_trans_sem);
48
49 if (transports[trans->t_type])
50 printk(KERN_ERR "RDS Transport type %d already registered\n",
51 trans->t_type);
52 else {
53 transports[trans->t_type] = trans;
54 printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name);
55 }
56
57 up_write(&rds_trans_sem);
58}
59EXPORT_SYMBOL_GPL(rds_trans_register);
60
61void rds_trans_unregister(struct rds_transport *trans)
62{
63 down_write(&rds_trans_sem);
64
65 transports[trans->t_type] = NULL;
66 printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name);
67
68 up_write(&rds_trans_sem);
69}
70EXPORT_SYMBOL_GPL(rds_trans_unregister);
71
72void rds_trans_put(struct rds_transport *trans)
73{
74 if (trans)
75 module_put(trans->t_owner);
76}
77
78struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr)
79{
80 struct rds_transport *ret = NULL;
81 struct rds_transport *trans;
82 unsigned int i;
83
84 if (IN_LOOPBACK(ntohl(addr)))
85 return &rds_loop_transport;
86
87 down_read(&rds_trans_sem);
88 for (i = 0; i < RDS_TRANS_COUNT; i++) {
89 trans = transports[i];
90
91 if (trans && (trans->laddr_check(net, addr) == 0) &&
92 (!trans->t_owner || try_module_get(trans->t_owner))) {
93 ret = trans;
94 break;
95 }
96 }
97 up_read(&rds_trans_sem);
98
99 return ret;
100}
101
102struct rds_transport *rds_trans_get(int t_type)
103{
104 struct rds_transport *ret = NULL;
105 struct rds_transport *trans;
106 unsigned int i;
107
108 down_read(&rds_trans_sem);
109 for (i = 0; i < RDS_TRANS_COUNT; i++) {
110 trans = transports[i];
111
112 if (trans && trans->t_type == t_type &&
113 (!trans->t_owner || try_module_get(trans->t_owner))) {
114 ret = trans;
115 break;
116 }
117 }
118 up_read(&rds_trans_sem);
119
120 return ret;
121}
122
123/*
124 * This returns the number of stats entries in the snapshot and only
125 * copies them using the iter if there is enough space for them. The
126 * caller passes in the global stats so that we can size and copy while
127 * holding the lock.
128 */
129unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
130 unsigned int avail)
131
132{
133 struct rds_transport *trans;
134 unsigned int total = 0;
135 unsigned int part;
136 int i;
137
138 rds_info_iter_unmap(iter);
139 down_read(&rds_trans_sem);
140
141 for (i = 0; i < RDS_TRANS_COUNT; i++) {
142 trans = transports[i];
143 if (!trans || !trans->stats_info_copy)
144 continue;
145
146 part = trans->stats_info_copy(iter, avail);
147 avail -= min(avail, part);
148 total += part;
149 }
150
151 up_read(&rds_trans_sem);
152
153 return total;
154}
155