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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 | struct rds_transport *rds_trans_get_preferred(__be32 addr) |
| 75 | { |
| 76 | struct rds_transport *ret = NULL; |
| 77 | int i; |
| 78 | |
| 79 | if (IN_LOOPBACK(ntohl(addr))) |
| 80 | return &rds_loop_transport; |
| 81 | |
| 82 | down_read(&rds_trans_sem); |
| 83 | for (i = 0; i < RDS_TRANS_COUNT; i++) |
| 84 | { |
| 85 | if (transports[i] && (transports[i]->laddr_check(addr) == 0)) { |
| 86 | ret = transports[i]; |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | up_read(&rds_trans_sem); |
| 91 | |
| 92 | return ret; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * This returns the number of stats entries in the snapshot and only |
| 97 | * copies them using the iter if there is enough space for them. The |
| 98 | * caller passes in the global stats so that we can size and copy while |
| 99 | * holding the lock. |
| 100 | */ |
| 101 | unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, |
| 102 | unsigned int avail) |
| 103 | |
| 104 | { |
| 105 | struct rds_transport *trans; |
| 106 | unsigned int total = 0; |
| 107 | unsigned int part; |
| 108 | int i; |
| 109 | |
| 110 | rds_info_iter_unmap(iter); |
| 111 | down_read(&rds_trans_sem); |
| 112 | |
| 113 | for (i = 0; i < RDS_TRANS_COUNT; i++) |
| 114 | { |
| 115 | trans = transports[i]; |
| 116 | if (!trans || !trans->stats_info_copy) |
| 117 | continue; |
| 118 | |
| 119 | part = trans->stats_info_copy(iter, avail); |
| 120 | avail -= min(avail, part); |
| 121 | total += part; |
| 122 | } |
| 123 | |
| 124 | up_read(&rds_trans_sem); |
| 125 | |
| 126 | return total; |
| 127 | } |
| 128 | |
| 129 |
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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
