aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/core/agent.c
blob: ecd1a3057c61bf41e9f09c5be5727de78866620d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/*
 * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
 */

#include <linux/slab.h>
#include <linux/string.h>

#include "agent.h"
#include "smi.h"

#define SPFX "ib_agent: "

struct ib_agent_port_private {
	struct list_head port_list;
	struct ib_mad_agent *agent[2];
};

static DEFINE_SPINLOCK(ib_agent_port_list_lock);
static LIST_HEAD(ib_agent_port_list);

static struct ib_agent_port_private *
__ib_get_agent_port(struct ib_device *device, int port_num)
{
	struct ib_agent_port_private *entry;

	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
		if (entry->agent[0]->device == device &&
		    entry->agent[0]->port_num == port_num)
			return entry;
	}
	return NULL;
}

static struct ib_agent_port_private *
ib_get_agent_port(struct ib_device *device, int port_num)
{
	struct ib_agent_port_private *entry;
	unsigned long flags;

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	entry = __ib_get_agent_port(device, port_num);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	return entry;
}

int agent_send_response(struct ib_mad *mad, struct ib_grh *grh,
			struct ib_wc *wc, struct ib_device *device,
			int port_num, int qpn)
{
	struct ib_agent_port_private *port_priv;
	struct ib_mad_agent *agent;
	struct ib_mad_send_buf *send_buf;
	struct ib_ah *ah;
	int ret;

	port_priv = ib_get_agent_port(device, port_num);
	if (!port_priv) {
		printk(KERN_ERR SPFX "Unable to find port agent\n");
		return -ENODEV;
	}

	agent = port_priv->agent[qpn];
	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
	if (IS_ERR(ah)) {
		ret = PTR_ERR(ah);
		printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
		return ret;
	}

	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
				      IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
				      GFP_KERNEL);
	if (IS_ERR(send_buf)) {
		ret = PTR_ERR(send_buf);
		printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
		goto err1;
	}

	memcpy(send_buf->mad, mad, sizeof *mad);
	send_buf->ah = ah;
	if ((ret = ib_post_send_mad(send_buf, NULL))) {
		printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
		goto err2;
	}
	return 0;
err2:
	ib_free_send_mad(send_buf);
err1:
	ib_destroy_ah(ah);
	return ret;
}

static void agent_send_handler(struct ib_mad_agent *mad_agent,
			       struct ib_mad_send_wc *mad_send_wc)
{
	ib_destroy_ah(mad_send_wc->send_buf->ah);
	ib_free_send_mad(mad_send_wc->send_buf);
}

int ib_agent_port_open(struct ib_device *device, int port_num)
{
	struct ib_agent_port_private *port_priv;
	unsigned long flags;
	int ret;

	/* Create new device info */
	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
	if (!port_priv) {
		printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
		ret = -ENOMEM;
		goto error1;
	}

	/* Obtain send only MAD agent for SMI QP */
	port_priv->agent[0] = ib_register_mad_agent(device, port_num,
						    IB_QPT_SMI, NULL, 0,
						    &agent_send_handler,
						    NULL, NULL);
	if (IS_ERR(port_priv->agent[0])) {
		ret = PTR_ERR(port_priv->agent[0]);
		goto error2;
	}

	/* Obtain send only MAD agent for GSI QP */
	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
						    IB_QPT_GSI, NULL, 0,
						    &agent_send_handler,
						    NULL, NULL);
	if (IS_ERR(port_priv->agent[1])) {
		ret = PTR_ERR(port_priv->agent[1]);
		goto error3;
	}

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	return 0;

error3:
	ib_unregister_mad_agent(port_priv->agent[0]);
error2:
	kfree(port_priv);
error1:
	return ret;
}

int ib_agent_port_close(struct ib_device *device, int port_num)
{
	struct ib_agent_port_private *port_priv;
	unsigned long flags;

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	port_priv = __ib_get_agent_port(device, port_num);
	if (port_priv == NULL) {
		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
		printk(KERN_ERR SPFX "Port %d not found\n", port_num);
		return -ENODEV;
	}
	list_del(&port_priv->port_list);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	ib_unregister_mad_agent(port_priv->agent[1]);
	ib_unregister_mad_agent(port_priv->agent[0]);
	kfree(port_priv);
	return 0;
}