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 /* Need to check both agent[0] and agent[1], as an agent port
63 * may only have one of them
64 */
65 if (entry->agent[0] &&
66 entry->agent[0]->device == device &&
67 entry->agent[0]->port_num == port_num)
68 return entry;
69
70 if (entry->agent[1] &&
71 entry->agent[1]->device == device &&
72 entry->agent[1]->port_num == port_num)
73 return entry;
74 }
75 return NULL;
76}
77
78static struct ib_agent_port_private *
79ib_get_agent_port(const struct ib_device *device, int port_num)
80{
81 struct ib_agent_port_private *entry;
82 unsigned long flags;
83
84 spin_lock_irqsave(&ib_agent_port_list_lock, flags);
85 entry = __ib_get_agent_port(device, port_num);
86 spin_unlock_irqrestore(lock: &ib_agent_port_list_lock, flags);
87 return entry;
88}
89
90void agent_send_response(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh,
91 const struct ib_wc *wc, const struct ib_device *device,
92 int port_num, int qpn, size_t resp_mad_len, bool opa)
93{
94 struct ib_agent_port_private *port_priv;
95 struct ib_mad_agent *agent;
96 struct ib_mad_send_buf *send_buf;
97 struct ib_ah *ah;
98 struct ib_mad_send_wr_private *mad_send_wr;
99
100 if (rdma_cap_ib_switch(device))
101 port_priv = ib_get_agent_port(device, port_num: 0);
102 else
103 port_priv = ib_get_agent_port(device, port_num);
104
105 if (!port_priv) {
106 dev_err(&device->dev, "Unable to find port agent\n");
107 return;
108 }
109
110 agent = port_priv->agent[qpn];
111 ah = ib_create_ah_from_wc(pd: agent->qp->pd, wc, grh, port_num);
112 if (IS_ERR(ptr: ah)) {
113 dev_err(&device->dev, "ib_create_ah_from_wc error %pe\n", ah);
114 return;
115 }
116
117 if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)
118 resp_mad_len = IB_MGMT_MAD_SIZE;
119
120 send_buf = ib_create_send_mad(mad_agent: agent, remote_qpn: wc->src_qp, pkey_index: wc->pkey_index, rmpp_active: 0,
121 hdr_len: IB_MGMT_MAD_HDR,
122 data_len: resp_mad_len - IB_MGMT_MAD_HDR,
123 GFP_KERNEL,
124 base_version: mad_hdr->base_version);
125 if (IS_ERR(ptr: send_buf)) {
126 dev_err(&device->dev, "ib_create_send_mad error\n");
127 goto err1;
128 }
129
130 memcpy(send_buf->mad, mad_hdr, resp_mad_len);
131 send_buf->ah = ah;
132
133 if (rdma_cap_ib_switch(device)) {
134 mad_send_wr = container_of(send_buf,
135 struct ib_mad_send_wr_private,
136 send_buf);
137 mad_send_wr->send_wr.port_num = port_num;
138 }
139
140 if (ib_post_send_mad(send_buf, NULL)) {
141 dev_err(&device->dev, "ib_post_send_mad error\n");
142 goto err2;
143 }
144 return;
145err2:
146 ib_free_send_mad(send_buf);
147err1:
148 rdma_destroy_ah(ah, flags: RDMA_DESTROY_AH_SLEEPABLE);
149}
150
151static void agent_send_handler(struct ib_mad_agent *mad_agent,
152 struct ib_mad_send_wc *mad_send_wc)
153{
154 rdma_destroy_ah(ah: mad_send_wc->send_buf->ah, flags: RDMA_DESTROY_AH_SLEEPABLE);
155 ib_free_send_mad(send_buf: mad_send_wc->send_buf);
156}
157
158int ib_agent_port_open(struct ib_device *device, int port_num)
159{
160 struct ib_agent_port_private *port_priv;
161 unsigned long flags;
162 int ret;
163
164 /* Create new device info */
165 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
166 if (!port_priv) {
167 ret = -ENOMEM;
168 goto error1;
169 }
170
171 if (rdma_cap_ib_smi(device, port_num)) {
172 /* Obtain send only MAD agent for SMI QP */
173 port_priv->agent[0] = ib_register_mad_agent(device, port_num,
174 qp_type: IB_QPT_SMI, NULL, rmpp_version: 0,
175 send_handler: &agent_send_handler,
176 NULL, NULL, registration_flags: 0);
177 if (IS_ERR(ptr: port_priv->agent[0])) {
178 ret = PTR_ERR(ptr: port_priv->agent[0]);
179 goto error2;
180 }
181 }
182
183 if (rdma_cap_ib_cm(device, port_num)) {
184 /* Obtain send only MAD agent for GSI QP */
185 port_priv->agent[1] = ib_register_mad_agent(device, port_num,
186 qp_type: IB_QPT_GSI, NULL, rmpp_version: 0,
187 send_handler: &agent_send_handler,
188 NULL, NULL, registration_flags: 0);
189 if (IS_ERR(ptr: port_priv->agent[1])) {
190 ret = PTR_ERR(ptr: port_priv->agent[1]);
191 goto error3;
192 }
193 }
194
195 spin_lock_irqsave(&ib_agent_port_list_lock, flags);
196 list_add_tail(new: &port_priv->port_list, head: &ib_agent_port_list);
197 spin_unlock_irqrestore(lock: &ib_agent_port_list_lock, flags);
198
199 return 0;
200
201error3:
202 if (port_priv->agent[0])
203 ib_unregister_mad_agent(mad_agent: port_priv->agent[0]);
204error2:
205 kfree(objp: port_priv);
206error1:
207 return ret;
208}
209
210int ib_agent_port_close(struct ib_device *device, int port_num)
211{
212 struct ib_agent_port_private *port_priv;
213 unsigned long flags;
214
215 spin_lock_irqsave(&ib_agent_port_list_lock, flags);
216 port_priv = __ib_get_agent_port(device, port_num);
217 if (port_priv == NULL) {
218 spin_unlock_irqrestore(lock: &ib_agent_port_list_lock, flags);
219 dev_err(&device->dev, "Port %d not found\n", port_num);
220 return -ENODEV;
221 }
222 list_del(entry: &port_priv->port_list);
223 spin_unlock_irqrestore(lock: &ib_agent_port_list_lock, flags);
224
225 if (port_priv->agent[1])
226 ib_unregister_mad_agent(mad_agent: port_priv->agent[1]);
227 if (port_priv->agent[0])
228 ib_unregister_mad_agent(mad_agent: port_priv->agent[0]);
229
230 kfree(objp: port_priv);
231 return 0;
232}
233

source code of linux/drivers/infiniband/core/agent.c