2 * Copyright (c) 2006, 2017 Oracle and/or its affiliates. All rights reserved.
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6 * General Public License (GPL) Version 2, available from the file
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11 * without modification, are permitted provided that the following
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23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/kernel.h>
34 #include <linux/module.h>
36 #include <linux/ipv6.h>
41 static struct rds_transport *transports[RDS_TRANS_COUNT];
42 static DECLARE_RWSEM(rds_trans_sem);
44 void rds_trans_register(struct rds_transport *trans)
46 BUG_ON(strlen(trans->t_name) + 1 > TRANSNAMSIZ);
48 down_write(&rds_trans_sem);
50 if (transports[trans->t_type])
51 printk(KERN_ERR "RDS Transport type %d already registered\n",
54 transports[trans->t_type] = trans;
55 printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name);
58 up_write(&rds_trans_sem);
60 EXPORT_SYMBOL_GPL(rds_trans_register);
62 void rds_trans_unregister(struct rds_transport *trans)
64 down_write(&rds_trans_sem);
66 transports[trans->t_type] = NULL;
67 printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name);
69 up_write(&rds_trans_sem);
71 EXPORT_SYMBOL_GPL(rds_trans_unregister);
73 void rds_trans_put(struct rds_transport *trans)
76 module_put(trans->t_owner);
79 struct rds_transport *rds_trans_get_preferred(struct net *net,
80 const struct in6_addr *addr,
83 struct rds_transport *ret = NULL;
84 struct rds_transport *trans;
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;
94 down_read(&rds_trans_sem);
95 for (i = 0; i < RDS_TRANS_COUNT; i++) {
96 trans = transports[i];
98 if (trans && (trans->laddr_check(net, addr, scope_id) == 0) &&
99 (!trans->t_owner || try_module_get(trans->t_owner))) {
104 up_read(&rds_trans_sem);
109 struct rds_transport *rds_trans_get(int t_type)
111 struct rds_transport *ret = NULL;
112 struct rds_transport *trans;
115 down_read(&rds_trans_sem);
116 for (i = 0; i < RDS_TRANS_COUNT; i++) {
117 trans = transports[i];
119 if (trans && trans->t_type == t_type &&
120 (!trans->t_owner || try_module_get(trans->t_owner))) {
125 up_read(&rds_trans_sem);
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
136 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
140 struct rds_transport *trans;
141 unsigned int total = 0;
145 rds_info_iter_unmap(iter);
146 down_read(&rds_trans_sem);
148 for (i = 0; i < RDS_TRANS_COUNT; i++) {
149 trans = transports[i];
150 if (!trans || !trans->stats_info_copy)
153 part = trans->stats_info_copy(iter, avail);
154 avail -= min(avail, part);
158 up_read(&rds_trans_sem);