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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
20 * disclaimer in the documentation and/or other materials
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
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
33 #include <linux/kernel.h>
34 #include <linux/module.h>
40 static struct rds_transport
*transports
[RDS_TRANS_COUNT
];
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 if (transports
[trans
->t_type
])
50 printk(KERN_ERR
"RDS Transport type %d already registered\n",
53 transports
[trans
->t_type
] = trans
;
54 printk(KERN_INFO
"Registered RDS/%s transport\n", trans
->t_name
);
57 up_write(&rds_trans_sem
);
61 EXPORT_SYMBOL_GPL(rds_trans_register
);
63 void rds_trans_unregister(struct rds_transport
*trans
)
65 down_write(&rds_trans_sem
);
67 transports
[trans
->t_type
] = NULL
;
68 printk(KERN_INFO
"Unregistered RDS/%s transport\n", trans
->t_name
);
70 up_write(&rds_trans_sem
);
72 EXPORT_SYMBOL_GPL(rds_trans_unregister
);
74 void rds_trans_put(struct rds_transport
*trans
)
76 if (trans
&& trans
->t_owner
)
77 module_put(trans
->t_owner
);
80 struct rds_transport
*rds_trans_get_preferred(__be32 addr
)
82 struct rds_transport
*ret
= NULL
;
83 struct rds_transport
*trans
;
86 if (IN_LOOPBACK(ntohl(addr
)))
87 return &rds_loop_transport
;
89 down_read(&rds_trans_sem
);
90 for (i
= 0; i
< RDS_TRANS_COUNT
; i
++) {
91 trans
= transports
[i
];
93 if (trans
&& (trans
->laddr_check(addr
) == 0) &&
94 (!trans
->t_owner
|| try_module_get(trans
->t_owner
))) {
99 up_read(&rds_trans_sem
);
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
110 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator
*iter
,
114 struct rds_transport
*trans
;
115 unsigned int total
= 0;
119 rds_info_iter_unmap(iter
);
120 down_read(&rds_trans_sem
);
122 for (i
= 0; i
< RDS_TRANS_COUNT
; i
++)
124 trans
= transports
[i
];
125 if (!trans
|| !trans
->stats_info_copy
)
128 part
= trans
->stats_info_copy(iter
, avail
);
129 avail
-= min(avail
, part
);
133 up_read(&rds_trans_sem
);