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) 2004-2007 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 */
38
39#include <linux/slab.h>
40#include <linux/string.h>
41
42#include "agent.h"
43#include "smi.h"
44#include "mad_priv.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(const 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[1]->device == device &&
63		    entry->agent[1]->port_num == port_num)
64			return entry;
65	}
66	return NULL;
67}
68
69static struct ib_agent_port_private *
70ib_get_agent_port(const 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
81void agent_send_response(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh,
82			 const struct ib_wc *wc, const struct ib_device *device,
83			 int port_num, int qpn, size_t resp_mad_len, bool opa)
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	struct ib_mad_send_wr_private *mad_send_wr;
90
91	if (rdma_cap_ib_switch(device))
92		port_priv = ib_get_agent_port(device, 0);
93	else
94		port_priv = ib_get_agent_port(device, port_num);
95
96	if (!port_priv) {
97		dev_err(&device->dev, "Unable to find port agent\n");
98		return;
99	}
100
101	agent = port_priv->agent[qpn];
102	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
103	if (IS_ERR(ah)) {
104		dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",
105			PTR_ERR(ah));
106		return;
107	}
108
109	if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)
110		resp_mad_len = IB_MGMT_MAD_SIZE;
111
112	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
113				      IB_MGMT_MAD_HDR,
114				      resp_mad_len - IB_MGMT_MAD_HDR,
115				      GFP_KERNEL,
116				      mad_hdr->base_version);
117	if (IS_ERR(send_buf)) {
118		dev_err(&device->dev, "ib_create_send_mad error\n");
119		goto err1;
120	}
121
122	memcpy(send_buf->mad, mad_hdr, resp_mad_len);
123	send_buf->ah = ah;
124
125	if (rdma_cap_ib_switch(device)) {
126		mad_send_wr = container_of(send_buf,
127					   struct ib_mad_send_wr_private,
128					   send_buf);
129		mad_send_wr->send_wr.port_num = port_num;
130	}
131
132	if (ib_post_send_mad(send_buf, NULL)) {
133		dev_err(&device->dev, "ib_post_send_mad error\n");
134		goto err2;
135	}
136	return;
137err2:
138	ib_free_send_mad(send_buf);
139err1:
140	ib_destroy_ah(ah);
141}
142
143static void agent_send_handler(struct ib_mad_agent *mad_agent,
144			       struct ib_mad_send_wc *mad_send_wc)
145{
146	ib_destroy_ah(mad_send_wc->send_buf->ah);
147	ib_free_send_mad(mad_send_wc->send_buf);
148}
149
150int ib_agent_port_open(struct ib_device *device, int port_num)
151{
152	struct ib_agent_port_private *port_priv;
153	unsigned long flags;
154	int ret;
155
156	/* Create new device info */
157	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
158	if (!port_priv) {
159		dev_err(&device->dev, "No memory for ib_agent_port_private\n");
160		ret = -ENOMEM;
161		goto error1;
162	}
163
164	if (rdma_cap_ib_smi(device, port_num)) {
165		/* Obtain send only MAD agent for SMI QP */
166		port_priv->agent[0] = ib_register_mad_agent(device, port_num,
167							    IB_QPT_SMI, NULL, 0,
168							    &agent_send_handler,
169							    NULL, NULL, 0);
170		if (IS_ERR(port_priv->agent[0])) {
171			ret = PTR_ERR(port_priv->agent[0]);
172			goto error2;
173		}
174	}
175
176	/* Obtain send only MAD agent for GSI QP */
177	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
178						    IB_QPT_GSI, NULL, 0,
179						    &agent_send_handler,
180						    NULL, NULL, 0);
181	if (IS_ERR(port_priv->agent[1])) {
182		ret = PTR_ERR(port_priv->agent[1]);
183		goto error3;
184	}
185
186	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
187	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
188	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
189
190	return 0;
191
192error3:
193	if (port_priv->agent[0])
194		ib_unregister_mad_agent(port_priv->agent[0]);
195error2:
196	kfree(port_priv);
197error1:
198	return ret;
199}
200
201int ib_agent_port_close(struct ib_device *device, int port_num)
202{
203	struct ib_agent_port_private *port_priv;
204	unsigned long flags;
205
206	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
207	port_priv = __ib_get_agent_port(device, port_num);
208	if (port_priv == NULL) {
209		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
210		dev_err(&device->dev, "Port %d not found\n", port_num);
211		return -ENODEV;
212	}
213	list_del(&port_priv->port_list);
214	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
215
216	ib_unregister_mad_agent(port_priv->agent[1]);
217	if (port_priv->agent[0])
218		ib_unregister_mad_agent(port_priv->agent[0]);
219
220	kfree(port_priv);
221	return 0;
222}
223