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
48 struct ib_agent_port_private {
49 struct list_head port_list;
50 struct ib_mad_agent *agent[2];
51 };
52
53 static DEFINE_SPINLOCK(ib_agent_port_list_lock);
54 static LIST_HEAD(ib_agent_port_list);
55
56 static struct ib_agent_port_private *
__ib_get_agent_port(struct ib_device * device,int port_num)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[1]->device == device &&
63 entry->agent[1]->port_num == port_num)
64 return entry;
65 }
66 return NULL;
67 }
68
69 static struct ib_agent_port_private *
ib_get_agent_port(struct ib_device * device,int port_num)70 ib_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
agent_send_response(struct ib_mad * mad,struct ib_grh * grh,struct ib_wc * wc,struct ib_device * device,int port_num,int qpn)81 void 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 struct ib_mad_send_wr_private *mad_send_wr;
90
91 if (device->node_type == RDMA_NODE_IB_SWITCH)
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 printk(KERN_ERR SPFX "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 printk(KERN_ERR SPFX "ib_create_ah_from_wc error %ld\n",
105 PTR_ERR(ah));
106 return;
107 }
108
109 send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
110 IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
111 GFP_KERNEL);
112 if (IS_ERR(send_buf)) {
113 printk(KERN_ERR SPFX "ib_create_send_mad error\n");
114 goto err1;
115 }
116
117 memcpy(send_buf->mad, mad, sizeof *mad);
118 send_buf->ah = ah;
119
120 if (device->node_type == RDMA_NODE_IB_SWITCH) {
121 mad_send_wr = container_of(send_buf,
122 struct ib_mad_send_wr_private,
123 send_buf);
124 mad_send_wr->send_wr.wr.ud.port_num = port_num;
125 }
126
127 if (ib_post_send_mad(send_buf, NULL)) {
128 printk(KERN_ERR SPFX "ib_post_send_mad error\n");
129 goto err2;
130 }
131 return;
132 err2:
133 ib_free_send_mad(send_buf);
134 err1:
135 ib_destroy_ah(ah);
136 }
137
agent_send_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_wc * mad_send_wc)138 static void agent_send_handler(struct ib_mad_agent *mad_agent,
139 struct ib_mad_send_wc *mad_send_wc)
140 {
141 ib_destroy_ah(mad_send_wc->send_buf->ah);
142 ib_free_send_mad(mad_send_wc->send_buf);
143 }
144
ib_agent_port_open(struct ib_device * device,int port_num)145 int ib_agent_port_open(struct ib_device *device, int port_num)
146 {
147 struct ib_agent_port_private *port_priv;
148 unsigned long flags;
149 int ret;
150
151 /* Create new device info */
152 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
153 if (!port_priv) {
154 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
155 ret = -ENOMEM;
156 goto error1;
157 }
158
159 if (rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND) {
160 /* Obtain send only MAD agent for SMI QP */
161 port_priv->agent[0] = ib_register_mad_agent(device, port_num,
162 IB_QPT_SMI, NULL, 0,
163 &agent_send_handler,
164 NULL, NULL);
165 if (IS_ERR(port_priv->agent[0])) {
166 ret = PTR_ERR(port_priv->agent[0]);
167 goto error2;
168 }
169 }
170
171 /* Obtain send only MAD agent for GSI QP */
172 port_priv->agent[1] = ib_register_mad_agent(device, port_num,
173 IB_QPT_GSI, NULL, 0,
174 &agent_send_handler,
175 NULL, NULL);
176 if (IS_ERR(port_priv->agent[1])) {
177 ret = PTR_ERR(port_priv->agent[1]);
178 goto error3;
179 }
180
181 spin_lock_irqsave(&ib_agent_port_list_lock, flags);
182 list_add_tail(&port_priv->port_list, &ib_agent_port_list);
183 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
184
185 return 0;
186
187 error3:
188 if (port_priv->agent[0])
189 ib_unregister_mad_agent(port_priv->agent[0]);
190 error2:
191 kfree(port_priv);
192 error1:
193 return ret;
194 }
195
ib_agent_port_close(struct ib_device * device,int port_num)196 int ib_agent_port_close(struct ib_device *device, int port_num)
197 {
198 struct ib_agent_port_private *port_priv;
199 unsigned long flags;
200
201 spin_lock_irqsave(&ib_agent_port_list_lock, flags);
202 port_priv = __ib_get_agent_port(device, port_num);
203 if (port_priv == NULL) {
204 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
205 printk(KERN_ERR SPFX "Port %d not found\n", port_num);
206 return -ENODEV;
207 }
208 list_del(&port_priv->port_list);
209 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
210
211 ib_unregister_mad_agent(port_priv->agent[1]);
212 if (port_priv->agent[0])
213 ib_unregister_mad_agent(port_priv->agent[0]);
214
215 kfree(port_priv);
216 return 0;
217 }
218