1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 * $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
35 */
36
37 #include <linux/string.h>
38 #include <linux/slab.h>
39
40 #include <rdma/ib_verbs.h>
41 #include <rdma/ib_mad.h>
42 #include <rdma/ib_smi.h>
43
44 #include "mthca_dev.h"
45 #include "mthca_cmd.h"
46
47 enum {
48 MTHCA_VENDOR_CLASS1 = 0x9,
49 MTHCA_VENDOR_CLASS2 = 0xa
50 };
51
52 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
53 {
54 struct ib_port_attr *tprops = NULL;
55 int ret;
56
57 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
58 if (!tprops)
59 return -ENOMEM;
60
61 ret = ib_query_port(&dev->ib_dev, port_num, tprops);
62 if (ret) {
63 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
64 ret, dev->ib_dev.name, port_num);
65 goto out;
66 }
67
68 dev->rate[port_num - 1] = tprops->active_speed *
69 ib_width_enum_to_int(tprops->active_width);
70
71 out:
72 kfree(tprops);
73 return ret;
74 }
75
76 static void update_sm_ah(struct mthca_dev *dev,
77 u8 port_num, u16 lid, u8 sl)
78 {
79 struct ib_ah *new_ah;
80 struct ib_ah_attr ah_attr;
81 unsigned long flags;
82
83 if (!dev->send_agent[port_num - 1][0])
84 return;
85
86 memset(&ah_attr, 0, sizeof ah_attr);
87 ah_attr.dlid = lid;
88 ah_attr.sl = sl;
89 ah_attr.port_num = port_num;
90
91 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
92 &ah_attr);
93 if (IS_ERR(new_ah))
94 return;
95
96 spin_lock_irqsave(&dev->sm_lock, flags);
97 if (dev->sm_ah[port_num - 1])
98 ib_destroy_ah(dev->sm_ah[port_num - 1]);
99 dev->sm_ah[port_num - 1] = new_ah;
100 spin_unlock_irqrestore(&dev->sm_lock, flags);
101 }
102
103 /*
104 * Snoop SM MADs for port info and P_Key table sets, so we can
105 * synthesize LID change and P_Key change events.
106 */
107 static void smp_snoop(struct ib_device *ibdev,
108 u8 port_num,
109 struct ib_mad *mad)
110 {
111 struct ib_event event;
112
113 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
114 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
115 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
116 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
117 struct ib_port_info *pinfo =
118 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
119
120 mthca_update_rate(to_mdev(ibdev), port_num);
121 update_sm_ah(to_mdev(ibdev), port_num,
122 be16_to_cpu(pinfo->sm_lid),
123 pinfo->neighbormtu_mastersmsl & 0xf);
124
125 event.device = ibdev;
126 event.element.port_num = port_num;
127
128 if(pinfo->clientrereg_resv_subnetto & 0x80)
129 event.event = IB_EVENT_CLIENT_REREGISTER;
130 else
131 event.event = IB_EVENT_LID_CHANGE;
132
133 ib_dispatch_event(&event);
134 }
135
136 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
137 event.device = ibdev;
138 event.event = IB_EVENT_PKEY_CHANGE;
139 event.element.port_num = port_num;
140 ib_dispatch_event(&event);
141 }
142 }
143 }
144
145 static void node_desc_override(struct ib_device *dev,
146 struct ib_mad *mad)
147 {
148 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
149 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
150 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
151 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
152 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
153 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
154 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
155 }
156 }
157
158 static void forward_trap(struct mthca_dev *dev,
159 u8 port_num,
160 struct ib_mad *mad)
161 {
162 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
163 struct ib_mad_send_buf *send_buf;
164 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
165 int ret;
166 unsigned long flags;
167
168 if (agent) {
169 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
170 IB_MGMT_MAD_DATA, GFP_ATOMIC);
171 /*
172 * We rely here on the fact that MLX QPs don't use the
173 * address handle after the send is posted (this is
174 * wrong following the IB spec strictly, but we know
175 * it's OK for our devices).
176 */
177 spin_lock_irqsave(&dev->sm_lock, flags);
178 memcpy(send_buf->mad, mad, sizeof *mad);
179 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
180 ret = ib_post_send_mad(send_buf, NULL);
181 else
182 ret = -EINVAL;
183 spin_unlock_irqrestore(&dev->sm_lock, flags);
184
185 if (ret)
186 ib_free_send_mad(send_buf);
187 }
188 }
189
190 int mthca_process_mad(struct ib_device *ibdev,
191 int mad_flags,
192 u8 port_num,
193 struct ib_wc *in_wc,
194 struct ib_grh *in_grh,
195 struct ib_mad *in_mad,
196 struct ib_mad *out_mad)
197 {
198 int err;
199 u8 status;
200 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
201
202 /* Forward locally generated traps to the SM */
203 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
204 slid == 0) {
205 forward_trap(to_mdev(ibdev), port_num, in_mad);
206 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
207 }
208
209 /*
210 * Only handle SM gets, sets and trap represses for SM class
211 *
212 * Only handle PMA and Mellanox vendor-specific class gets and
213 * sets for other classes.
214 */
215 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
216 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
217 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
218 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
219 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
220 return IB_MAD_RESULT_SUCCESS;
221
222 /*
223 * Don't process SMInfo queries or vendor-specific
224 * MADs -- the SMA can't handle them.
225 */
226 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
227 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
228 IB_SMP_ATTR_VENDOR_MASK))
229 return IB_MAD_RESULT_SUCCESS;
230 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
231 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
232 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
233 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
234 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
235 return IB_MAD_RESULT_SUCCESS;
236 } else
237 return IB_MAD_RESULT_SUCCESS;
238
239 err = mthca_MAD_IFC(to_mdev(ibdev),
240 mad_flags & IB_MAD_IGNORE_MKEY,
241 mad_flags & IB_MAD_IGNORE_BKEY,
242 port_num, in_wc, in_grh, in_mad, out_mad,
243 &status);
244 if (err) {
245 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
246 return IB_MAD_RESULT_FAILURE;
247 }
248 if (status == MTHCA_CMD_STAT_BAD_PKT)
249 return IB_MAD_RESULT_SUCCESS;
250 if (status) {
251 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
252 status);
253 return IB_MAD_RESULT_FAILURE;
254 }
255
256 if (!out_mad->mad_hdr.status) {
257 smp_snoop(ibdev, port_num, in_mad);
258 node_desc_override(ibdev, out_mad);
259 }
260
261 /* set return bit in status of directed route responses */
262 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
263 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
264
265 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
266 /* no response for trap repress */
267 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
268
269 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
270 }
271
272 static void send_handler(struct ib_mad_agent *agent,
273 struct ib_mad_send_wc *mad_send_wc)
274 {
275 ib_free_send_mad(mad_send_wc->send_buf);
276 }
277
278 int mthca_create_agents(struct mthca_dev *dev)
279 {
280 struct ib_mad_agent *agent;
281 int p, q;
282 int ret;
283
284 spin_lock_init(&dev->sm_lock);
285
286 for (p = 0; p < dev->limits.num_ports; ++p)
287 for (q = 0; q <= 1; ++q) {
288 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
289 q ? IB_QPT_GSI : IB_QPT_SMI,
290 NULL, 0, send_handler,
291 NULL, NULL);
292 if (IS_ERR(agent)) {
293 ret = PTR_ERR(agent);
294 goto err;
295 }
296 dev->send_agent[p][q] = agent;
297 }
298
299
300 for (p = 1; p <= dev->limits.num_ports; ++p) {
301 ret = mthca_update_rate(dev, p);
302 if (ret) {
303 mthca_err(dev, "Failed to obtain port %d rate."
304 " aborting.\n", p);
305 goto err;
306 }
307 }
308
309 return 0;
310
311 err:
312 for (p = 0; p < dev->limits.num_ports; ++p)
313 for (q = 0; q <= 1; ++q)
314 if (dev->send_agent[p][q])
315 ib_unregister_mad_agent(dev->send_agent[p][q]);
316
317 return ret;
318 }
319
320 void mthca_free_agents(struct mthca_dev *dev)
321 {
322 struct ib_mad_agent *agent;
323 int p, q;
324
325 for (p = 0; p < dev->limits.num_ports; ++p) {
326 for (q = 0; q <= 1; ++q) {
327 agent = dev->send_agent[p][q];
328 dev->send_agent[p][q] = NULL;
329 ib_unregister_mad_agent(agent);
330 }
331
332 if (dev->sm_ah[p])
333 ib_destroy_ah(dev->sm_ah[p]);
334 }
335 }
336
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