1/*
2 * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
3 * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
4 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
5 * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
6 * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
8 *
9 * This software is available to you under a choice of one of two
10 * licenses.  You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
14 *
15 *     Redistribution and use in source and binary forms, with or
16 *     without modification, are permitted provided that the following
17 *     conditions are met:
18 *
19 *      - Redistributions of source code must retain the above
20 *        copyright notice, this list of conditions and the following
21 *        disclaimer.
22 *
23 *      - Redistributions in binary form must reproduce the above
24 *        copyright notice, this list of conditions and the following
25 *        disclaimer in the documentation and/or other materials
26 *        provided with the distribution.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * SOFTWARE.
36 *
37 * $Id: agent.c,v 1.1.1.1 2007/10/11 23:31:50 Exp $
38 */
39
40#include <linux/slab.h>
41#include <linux/string.h>
42
43#include "agent.h"
44#include "smi.h"
45
46#define SPFX "ib_agent: "
47
48struct ib_agent_port_private {
49	struct list_head port_list;
50	struct ib_mad_agent *agent[2];
51};
52
53static DEFINE_SPINLOCK(ib_agent_port_list_lock);
54static LIST_HEAD(ib_agent_port_list);
55
56static struct ib_agent_port_private *
57__ib_get_agent_port(struct ib_device *device, int port_num)
58{
59	struct ib_agent_port_private *entry;
60
61	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
62		if (entry->agent[0]->device == device &&
63		    entry->agent[0]->port_num == port_num)
64			return entry;
65	}
66	return NULL;
67}
68
69static struct ib_agent_port_private *
70ib_get_agent_port(struct ib_device *device, int port_num)
71{
72	struct ib_agent_port_private *entry;
73	unsigned long flags;
74
75	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
76	entry = __ib_get_agent_port(device, port_num);
77	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
78	return entry;
79}
80
81int agent_send_response(struct ib_mad *mad, struct ib_grh *grh,
82			struct ib_wc *wc, struct ib_device *device,
83			int port_num, int qpn)
84{
85	struct ib_agent_port_private *port_priv;
86	struct ib_mad_agent *agent;
87	struct ib_mad_send_buf *send_buf;
88	struct ib_ah *ah;
89	int ret;
90
91	port_priv = ib_get_agent_port(device, port_num);
92	if (!port_priv) {
93		printk(KERN_ERR SPFX "Unable to find port agent\n");
94		return -ENODEV;
95	}
96
97	agent = port_priv->agent[qpn];
98	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
99	if (IS_ERR(ah)) {
100		ret = PTR_ERR(ah);
101		printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
102		return ret;
103	}
104
105	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
106				      IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
107				      GFP_KERNEL);
108	if (IS_ERR(send_buf)) {
109		ret = PTR_ERR(send_buf);
110		printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
111		goto err1;
112	}
113
114	memcpy(send_buf->mad, mad, sizeof *mad);
115	send_buf->ah = ah;
116	if ((ret = ib_post_send_mad(send_buf, NULL))) {
117		printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
118		goto err2;
119	}
120	return 0;
121err2:
122	ib_free_send_mad(send_buf);
123err1:
124	ib_destroy_ah(ah);
125	return ret;
126}
127
128static void agent_send_handler(struct ib_mad_agent *mad_agent,
129			       struct ib_mad_send_wc *mad_send_wc)
130{
131	ib_destroy_ah(mad_send_wc->send_buf->ah);
132	ib_free_send_mad(mad_send_wc->send_buf);
133}
134
135int ib_agent_port_open(struct ib_device *device, int port_num)
136{
137	struct ib_agent_port_private *port_priv;
138	unsigned long flags;
139	int ret;
140
141	/* Create new device info */
142	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
143	if (!port_priv) {
144		printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
145		ret = -ENOMEM;
146		goto error1;
147	}
148
149	/* Obtain send only MAD agent for SMI QP */
150	port_priv->agent[0] = ib_register_mad_agent(device, port_num,
151						    IB_QPT_SMI, NULL, 0,
152						    &agent_send_handler,
153						    NULL, NULL);
154	if (IS_ERR(port_priv->agent[0])) {
155		ret = PTR_ERR(port_priv->agent[0]);
156		goto error2;
157	}
158
159	/* Obtain send only MAD agent for GSI QP */
160	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
161						    IB_QPT_GSI, NULL, 0,
162						    &agent_send_handler,
163						    NULL, NULL);
164	if (IS_ERR(port_priv->agent[1])) {
165		ret = PTR_ERR(port_priv->agent[1]);
166		goto error3;
167	}
168
169	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
170	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
171	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
172
173	return 0;
174
175error3:
176	ib_unregister_mad_agent(port_priv->agent[0]);
177error2:
178	kfree(port_priv);
179error1:
180	return ret;
181}
182
183int ib_agent_port_close(struct ib_device *device, int port_num)
184{
185	struct ib_agent_port_private *port_priv;
186	unsigned long flags;
187
188	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
189	port_priv = __ib_get_agent_port(device, port_num);
190	if (port_priv == NULL) {
191		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
192		printk(KERN_ERR SPFX "Port %d not found\n", port_num);
193		return -ENODEV;
194	}
195	list_del(&port_priv->port_list);
196	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
197
198	ib_unregister_mad_agent(port_priv->agent[1]);
199	ib_unregister_mad_agent(port_priv->agent[0]);
200	kfree(port_priv);
201	return 0;
202}
203