2 * Copyright (c) 2006 Oracle. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
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21 * provided with the distribution.
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
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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>
40 static LIST_HEAD(rds_transports);
41 static DECLARE_RWSEM(rds_trans_sem);
43 int rds_trans_register(struct rds_transport *trans)
45 BUG_ON(strlen(trans->t_name) + 1 > TRANSNAMSIZ);
47 down_write(&rds_trans_sem);
49 list_add_tail(&trans->t_item, &rds_transports);
50 printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name);
52 up_write(&rds_trans_sem);
57 void rds_trans_unregister(struct rds_transport *trans)
59 down_write(&rds_trans_sem);
61 list_del_init(&trans->t_item);
62 printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name);
64 up_write(&rds_trans_sem);
67 struct rds_transport *rds_trans_get_preferred(__be32 addr)
69 struct rds_transport *trans;
70 struct rds_transport *ret = NULL;
72 if (IN_LOOPBACK(ntohl(addr)))
73 return &rds_loop_transport;
75 down_read(&rds_trans_sem);
76 list_for_each_entry(trans, &rds_transports, t_item) {
77 if (trans->laddr_check(addr) == 0) {
82 up_read(&rds_trans_sem);
88 * This returns the number of stats entries in the snapshot and only
89 * copies them using the iter if there is enough space for them. The
90 * caller passes in the global stats so that we can size and copy while
93 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
97 struct rds_transport *trans;
98 unsigned int total = 0;
101 rds_info_iter_unmap(iter);
102 down_read(&rds_trans_sem);
104 list_for_each_entry(trans, &rds_transports, t_item) {
105 if (trans->stats_info_copy == NULL)
108 part = trans->stats_info_copy(iter, avail);
109 avail -= min(avail, part);
113 up_read(&rds_trans_sem);