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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 | |
40 | static struct rds_transport *transports[RDS_TRANS_COUNT]; |
41 | static DECLARE_RWSEM(rds_trans_sem); |
42 | |
43 | int 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 | |
59 | return 0; |
60 | } |
61 | EXPORT_SYMBOL_GPL(rds_trans_register); |
62 | |
63 | void rds_trans_unregister(struct rds_transport *trans) |
64 | { |
65 | down_write(&rds_trans_sem); |
66 | |
67 | transports[trans->t_type] = NULL; |
68 | printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name); |
69 | |
70 | up_write(&rds_trans_sem); |
71 | } |
72 | EXPORT_SYMBOL_GPL(rds_trans_unregister); |
73 | |
74 | void rds_trans_put(struct rds_transport *trans) |
75 | { |
76 | if (trans && trans->t_owner) |
77 | module_put(trans->t_owner); |
78 | } |
79 | |
80 | struct rds_transport *rds_trans_get_preferred(__be32 addr) |
81 | { |
82 | struct rds_transport *ret = NULL; |
83 | struct rds_transport *trans; |
84 | unsigned int i; |
85 | |
86 | if (IN_LOOPBACK(ntohl(addr))) |
87 | return &rds_loop_transport; |
88 | |
89 | down_read(&rds_trans_sem); |
90 | for (i = 0; i < RDS_TRANS_COUNT; i++) { |
91 | trans = transports[i]; |
92 | |
93 | if (trans && (trans->laddr_check(addr) == 0) && |
94 | (!trans->t_owner || try_module_get(trans->t_owner))) { |
95 | ret = trans; |
96 | break; |
97 | } |
98 | } |
99 | up_read(&rds_trans_sem); |
100 | |
101 | return ret; |
102 | } |
103 | |
104 | /* |
105 | * This returns the number of stats entries in the snapshot and only |
106 | * copies them using the iter if there is enough space for them. The |
107 | * caller passes in the global stats so that we can size and copy while |
108 | * holding the lock. |
109 | */ |
110 | unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, |
111 | unsigned int avail) |
112 | |
113 | { |
114 | struct rds_transport *trans; |
115 | unsigned int total = 0; |
116 | unsigned int part; |
117 | int i; |
118 | |
119 | rds_info_iter_unmap(iter); |
120 | down_read(&rds_trans_sem); |
121 | |
122 | for (i = 0; i < RDS_TRANS_COUNT; i++) |
123 | { |
124 | trans = transports[i]; |
125 | if (!trans || !trans->stats_info_copy) |
126 | continue; |
127 | |
128 | part = trans->stats_info_copy(iter, avail); |
129 | avail -= min(avail, part); |
130 | total += part; |
131 | } |
132 | |
133 | up_read(&rds_trans_sem); |
134 | |
135 | return total; |
136 | } |
137 | |
138 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9