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
35 #include <linux/string.h>
36 #include <linux/slab.h>
37
38 #include <rdma/ib_verbs.h>
39 #include <rdma/ib_mad.h>
40 #include <rdma/ib_smi.h>
41
42 #include "mthca_dev.h"
43 #include "mthca_cmd.h"
44
45 enum {
46 MTHCA_VENDOR_CLASS1 = 0x9,
47 MTHCA_VENDOR_CLASS2 = 0xa
48 };
49
mthca_update_rate(struct mthca_dev * dev,u8 port_num)50 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
51 {
52 struct ib_port_attr *tprops = NULL;
53 int ret;
54
55 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
56 if (!tprops)
57 return -ENOMEM;
58
59 ret = ib_query_port(&dev->ib_dev, port_num, tprops);
60 if (ret) {
61 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
62 ret, dev->ib_dev.name, port_num);
63 goto out;
64 }
65
66 dev->rate[port_num - 1] = tprops->active_speed *
67 ib_width_enum_to_int(tprops->active_width);
68
69 out:
70 kfree(tprops);
71 return ret;
72 }
73
update_sm_ah(struct mthca_dev * dev,u8 port_num,u16 lid,u8 sl)74 static void update_sm_ah(struct mthca_dev *dev,
75 u8 port_num, u16 lid, u8 sl)
76 {
77 struct ib_ah *new_ah;
78 struct ib_ah_attr ah_attr;
79 unsigned long flags;
80
81 if (!dev->send_agent[port_num - 1][0])
82 return;
83
84 memset(&ah_attr, 0, sizeof ah_attr);
85 ah_attr.dlid = lid;
86 ah_attr.sl = sl;
87 ah_attr.port_num = port_num;
88
89 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
90 &ah_attr);
91 if (IS_ERR(new_ah))
92 return;
93
94 spin_lock_irqsave(&dev->sm_lock, flags);
95 if (dev->sm_ah[port_num - 1])
96 ib_destroy_ah(dev->sm_ah[port_num - 1]);
97 dev->sm_ah[port_num - 1] = new_ah;
98 spin_unlock_irqrestore(&dev->sm_lock, flags);
99 }
100
101 /*
102 * Snoop SM MADs for port info and P_Key table sets, so we can
103 * synthesize LID change and P_Key change events.
104 */
smp_snoop(struct ib_device * ibdev,u8 port_num,struct ib_mad * mad,u16 prev_lid)105 static void smp_snoop(struct ib_device *ibdev,
106 u8 port_num,
107 struct ib_mad *mad,
108 u16 prev_lid)
109 {
110 struct ib_event event;
111
112 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
113 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
114 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
115 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
116 struct ib_port_info *pinfo =
117 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
118 u16 lid = be16_to_cpu(pinfo->lid);
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 ib_dispatch_event(&event);
131 }
132
133 if (prev_lid != lid) {
134 event.event = IB_EVENT_LID_CHANGE;
135 ib_dispatch_event(&event);
136 }
137 }
138
139 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
140 event.device = ibdev;
141 event.event = IB_EVENT_PKEY_CHANGE;
142 event.element.port_num = port_num;
143 ib_dispatch_event(&event);
144 }
145 }
146 }
147
node_desc_override(struct ib_device * dev,struct ib_mad * mad)148 static void node_desc_override(struct ib_device *dev,
149 struct ib_mad *mad)
150 {
151 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
152 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
153 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
154 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
155 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
156 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
157 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
158 }
159 }
160
forward_trap(struct mthca_dev * dev,u8 port_num,struct ib_mad * mad)161 static void forward_trap(struct mthca_dev *dev,
162 u8 port_num,
163 struct ib_mad *mad)
164 {
165 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
166 struct ib_mad_send_buf *send_buf;
167 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
168 int ret;
169 unsigned long flags;
170
171 if (agent) {
172 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
173 IB_MGMT_MAD_DATA, GFP_ATOMIC);
174 /*
175 * We rely here on the fact that MLX QPs don't use the
176 * address handle after the send is posted (this is
177 * wrong following the IB spec strictly, but we know
178 * it's OK for our devices).
179 */
180 spin_lock_irqsave(&dev->sm_lock, flags);
181 memcpy(send_buf->mad, mad, sizeof *mad);
182 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
183 ret = ib_post_send_mad(send_buf, NULL);
184 else
185 ret = -EINVAL;
186 spin_unlock_irqrestore(&dev->sm_lock, flags);
187
188 if (ret)
189 ib_free_send_mad(send_buf);
190 }
191 }
192
mthca_process_mad(struct ib_device * ibdev,int mad_flags,u8 port_num,struct ib_wc * in_wc,struct ib_grh * in_grh,struct ib_mad * in_mad,struct ib_mad * out_mad)193 int mthca_process_mad(struct ib_device *ibdev,
194 int mad_flags,
195 u8 port_num,
196 struct ib_wc *in_wc,
197 struct ib_grh *in_grh,
198 struct ib_mad *in_mad,
199 struct ib_mad *out_mad)
200 {
201 int err;
202 u8 status;
203 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
204 u16 prev_lid = 0;
205 struct ib_port_attr pattr;
206
207 /* Forward locally generated traps to the SM */
208 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
209 slid == 0) {
210 forward_trap(to_mdev(ibdev), port_num, in_mad);
211 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
212 }
213
214 /*
215 * Only handle SM gets, sets and trap represses for SM class
216 *
217 * Only handle PMA and Mellanox vendor-specific class gets and
218 * sets for other classes.
219 */
220 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
221 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
222 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
223 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
224 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
225 return IB_MAD_RESULT_SUCCESS;
226
227 /*
228 * Don't process SMInfo queries or vendor-specific
229 * MADs -- the SMA can't handle them.
230 */
231 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
232 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
233 IB_SMP_ATTR_VENDOR_MASK))
234 return IB_MAD_RESULT_SUCCESS;
235 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
236 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
237 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
238 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
239 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
240 return IB_MAD_RESULT_SUCCESS;
241 } else
242 return IB_MAD_RESULT_SUCCESS;
243 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
244 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
245 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
246 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
247 !ib_query_port(ibdev, port_num, &pattr))
248 prev_lid = pattr.lid;
249
250 err = mthca_MAD_IFC(to_mdev(ibdev),
251 mad_flags & IB_MAD_IGNORE_MKEY,
252 mad_flags & IB_MAD_IGNORE_BKEY,
253 port_num, in_wc, in_grh, in_mad, out_mad,
254 &status);
255 if (err) {
256 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
257 return IB_MAD_RESULT_FAILURE;
258 }
259 if (status == MTHCA_CMD_STAT_BAD_PKT)
260 return IB_MAD_RESULT_SUCCESS;
261 if (status) {
262 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
263 status);
264 return IB_MAD_RESULT_FAILURE;
265 }
266
267 if (!out_mad->mad_hdr.status) {
268 smp_snoop(ibdev, port_num, in_mad, prev_lid);
269 node_desc_override(ibdev, out_mad);
270 }
271
272 /* set return bit in status of directed route responses */
273 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
274 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
275
276 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
277 /* no response for trap repress */
278 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
279
280 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
281 }
282
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)283 static void send_handler(struct ib_mad_agent *agent,
284 struct ib_mad_send_wc *mad_send_wc)
285 {
286 ib_free_send_mad(mad_send_wc->send_buf);
287 }
288
mthca_create_agents(struct mthca_dev * dev)289 int mthca_create_agents(struct mthca_dev *dev)
290 {
291 struct ib_mad_agent *agent;
292 int p, q;
293 int ret;
294
295 spin_lock_init(&dev->sm_lock);
296
297 for (p = 0; p < dev->limits.num_ports; ++p)
298 for (q = 0; q <= 1; ++q) {
299 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
300 q ? IB_QPT_GSI : IB_QPT_SMI,
301 NULL, 0, send_handler,
302 NULL, NULL);
303 if (IS_ERR(agent)) {
304 ret = PTR_ERR(agent);
305 goto err;
306 }
307 dev->send_agent[p][q] = agent;
308 }
309
310
311 for (p = 1; p <= dev->limits.num_ports; ++p) {
312 ret = mthca_update_rate(dev, p);
313 if (ret) {
314 mthca_err(dev, "Failed to obtain port %d rate."
315 " aborting.\n", p);
316 goto err;
317 }
318 }
319
320 return 0;
321
322 err:
323 for (p = 0; p < dev->limits.num_ports; ++p)
324 for (q = 0; q <= 1; ++q)
325 if (dev->send_agent[p][q])
326 ib_unregister_mad_agent(dev->send_agent[p][q]);
327
328 return ret;
329 }
330
mthca_free_agents(struct mthca_dev * dev)331 void mthca_free_agents(struct mthca_dev *dev)
332 {
333 struct ib_mad_agent *agent;
334 int p, q;
335
336 for (p = 0; p < dev->limits.num_ports; ++p) {
337 for (q = 0; q <= 1; ++q) {
338 agent = dev->send_agent[p][q];
339 dev->send_agent[p][q] = NULL;
340 ib_unregister_mad_agent(agent);
341 }
342
343 if (dev->sm_ah[p])
344 ib_destroy_ah(dev->sm_ah[p]);
345 }
346 }
347