1 /*
2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4
5 /*
6 * This file contains code imported from the OFED rds source file transport.c
7 * Oracle elects to have and use the contents of transport.c under and governed
8 * by the OpenIB.org BSD license (see below for full license text). However,
9 * the following notice accompanied the original version of this file:
10 */
11
12 /*
13 * Copyright (c) 2006 Oracle. All rights reserved.
14 *
15 * This software is available to you under a choice of one of two
16 * licenses. You may choose to be licensed under the terms of the GNU
17 * General Public License (GPL) Version 2, available from the file
18 * COPYING in the main directory of this source tree, or the
19 * OpenIB.org BSD license below:
20 *
21 * Redistribution and use in source and binary forms, with or
22 * without modification, are permitted provided that the following
23 * conditions are met:
24 *
25 * - Redistributions of source code must retain the above
26 * copyright notice, this list of conditions and the following
27 * disclaimer.
28 *
29 * - Redistributions in binary form must reproduce the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer in the documentation and/or other materials
32 * provided with the distribution.
33 *
34 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
35 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
36 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
37 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
38 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
39 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
40 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
41 * SOFTWARE.
42 *
43 */
44 #include <sys/ksynch.h>
45 #include <sys/list.h>
46 #include <sys/rds.h>
47 #include <sys/sysmacros.h>
48
49 #include <sys/ib/clients/rdsv3/rdsv3.h>
50 #include <sys/ib/clients/rdsv3/loop.h>
51 #include <sys/ib/clients/rdsv3/rdsv3_impl.h>
52 #include <sys/ib/clients/rdsv3/rdsv3_debug.h>
53
54 struct rdsv3_transport *transports[RDS_TRANS_COUNT];
55 krwlock_t trans_sem; /* this was a semaphore */
56
57 int
rdsv3_trans_register(struct rdsv3_transport * trans)58 rdsv3_trans_register(struct rdsv3_transport *trans)
59 {
60 RDSV3_DPRINTF4("rdsv3_trans_register", "Enter(trans: %p)", trans);
61
62 rw_enter(&trans_sem, RW_WRITER);
63
64 if (transports[trans->t_type]) {
65 cmn_err(CE_WARN,
66 "RDSV3 Transport type %d already registered\n",
67 trans->t_type);
68 rw_exit(&trans_sem);
69 return (1);
70 } else {
71 transports[trans->t_type] = trans;
72 RDSV3_DPRINTF2("rdsv3_trans_register",
73 "Registered RDS/%s transport\n", trans->t_name);
74 }
75
76 rw_exit(&trans_sem);
77
78 RDSV3_DPRINTF4("rdsv3_trans_register", "Return(trans: %p)", trans);
79
80 return (0);
81 }
82
83 void
rdsv3_trans_unregister(struct rdsv3_transport * trans)84 rdsv3_trans_unregister(struct rdsv3_transport *trans)
85 {
86 RDSV3_DPRINTF4("rdsv3_trans_register", "Enter(trans: %p)", trans);
87
88 rw_enter(&trans_sem, RW_WRITER);
89
90 transports[trans->t_type] = NULL;
91
92 rw_exit(&trans_sem);
93
94 RDSV3_DPRINTF4("rdsv3_trans_register", "Return(trans: %p)", trans);
95 }
96
97 struct rdsv3_transport *
rdsv3_trans_get_preferred(uint32_be_t addr)98 rdsv3_trans_get_preferred(uint32_be_t addr)
99 {
100 struct rdsv3_transport *ret = NULL;
101 int i;
102
103 RDSV3_DPRINTF4("rdsv3_trans_get_preferred", "Enter(addr: %x)",
104 ntohl(addr));
105
106 if (rdsv3_isloopback(addr))
107 return (&rdsv3_loop_transport);
108
109 rw_enter(&trans_sem, RW_READER);
110 for (i = 0; i < RDS_TRANS_COUNT; i++) {
111 if (transports[i] &&
112 transports[i]->laddr_check(addr) == 0) {
113 ret = transports[i];
114 break;
115 }
116 }
117 rw_exit(&trans_sem);
118
119 RDSV3_DPRINTF4("rdsv3_trans_get_preferred",
120 "Return(addr: %x, ret: %p)", ntohl(addr), ret);
121
122 return (ret);
123 }
124
125 /*
126 * This returns the number of stats entries in the snapshot and only
127 * copies them using the iter if there is enough space for them. The
128 * caller passes in the global stats so that we can size and copy while
129 * holding the lock.
130 */
131 /* ARGSUSED */
132 unsigned int
rdsv3_trans_stats_info_copy(struct rdsv3_info_iterator * iter,unsigned int avail)133 rdsv3_trans_stats_info_copy(struct rdsv3_info_iterator *iter,
134 unsigned int avail)
135 {
136 struct rdsv3_transport *trans;
137 unsigned int total = 0;
138 unsigned int part;
139 int i;
140
141 rw_enter(&trans_sem, RW_READER);
142
143 for (i = 0; i < RDS_TRANS_COUNT; i++) {
144 trans = transports[i];
145 if (!trans || !trans->stats_info_copy)
146 continue;
147
148 part = trans->stats_info_copy(iter, avail);
149 avail -= min(avail, part);
150 total += part;
151 }
152
153 rw_exit(&trans_sem);
154
155 return (total);
156 }
157