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
54struct rdsv3_transport *transports[RDS_TRANS_COUNT];
55krwlock_t		trans_sem; /* this was a semaphore */
56
57int
58rdsv3_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
83void
84rdsv3_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
97struct rdsv3_transport *
98rdsv3_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 */
132unsigned int
133rdsv3_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