1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 * Copyright (c) 2014 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 *
36 */
37
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40 #include <linux/dma-mapping.h>
41 #include <linux/slab.h>
42 #include <linux/module.h>
43 #include <rdma/ib_cache.h>
44
45 #include "mad_priv.h"
46 #include "mad_rmpp.h"
47 #include "smi.h"
48 #include "opa_smi.h"
49 #include "agent.h"
50
51 MODULE_LICENSE("Dual BSD/GPL");
52 MODULE_DESCRIPTION("kernel IB MAD API");
53 MODULE_AUTHOR("Hal Rosenstock");
54 MODULE_AUTHOR("Sean Hefty");
55
56 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
57 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
58
59 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
61 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
63
64 static struct list_head ib_mad_port_list;
65 static u32 ib_mad_client_id = 0;
66
67 /* Port list lock */
68 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
69
70 /* Forward declarations */
71 static int method_in_use(struct ib_mad_mgmt_method_table **method,
72 struct ib_mad_reg_req *mad_reg_req);
73 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
74 static struct ib_mad_agent_private *find_mad_agent(
75 struct ib_mad_port_private *port_priv,
76 const struct ib_mad_hdr *mad);
77 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
78 struct ib_mad_private *mad);
79 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
80 static void timeout_sends(struct work_struct *work);
81 static void local_completions(struct work_struct *work);
82 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv,
84 u8 mgmt_class);
85 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
86 struct ib_mad_agent_private *agent_priv);
87
88 /*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92 static inline struct ib_mad_port_private *
__ib_get_mad_port(struct ib_device * device,int port_num)93 __ib_get_mad_port(struct ib_device *device, int port_num)
94 {
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102 }
103
104 /*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108 static inline struct ib_mad_port_private *
ib_get_mad_port(struct ib_device * device,int port_num)109 ib_get_mad_port(struct ib_device *device, int port_num)
110 {
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119 }
120
convert_mgmt_class(u8 mgmt_class)121 static inline u8 convert_mgmt_class(u8 mgmt_class)
122 {
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126 }
127
get_spl_qp_index(enum ib_qp_type qp_type)128 static int get_spl_qp_index(enum ib_qp_type qp_type)
129 {
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139 }
140
vendor_class_index(u8 mgmt_class)141 static int vendor_class_index(u8 mgmt_class)
142 {
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144 }
145
is_vendor_class(u8 mgmt_class)146 static int is_vendor_class(u8 mgmt_class)
147 {
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152 }
153
is_vendor_oui(char * oui)154 static int is_vendor_oui(char *oui)
155 {
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159 }
160
is_vendor_method_in_use(struct ib_mad_mgmt_vendor_class * vendor_class,struct ib_mad_reg_req * mad_reg_req)161 static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164 {
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180 }
181
ib_response_mad(const struct ib_mad_hdr * hdr)182 int ib_response_mad(const struct ib_mad_hdr *hdr)
183 {
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188 }
189 EXPORT_SYMBOL(ib_response_mad);
190
191 /*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
ib_register_mad_agent(struct ib_device * device,u8 port_num,enum ib_qp_type qp_type,struct ib_mad_reg_req * mad_reg_req,u8 rmpp_version,ib_mad_send_handler send_handler,ib_mad_recv_handler recv_handler,void * context,u32 registration_flags)194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203 {
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
321 ret = ERR_PTR(-ENODEV);
322 goto error1;
323 }
324
325 /* Verify the QP requested is supported. For example, Ethernet devices
326 * will not have QP0 */
327 if (!port_priv->qp_info[qpn].qp) {
328 dev_notice(&device->dev,
329 "ib_register_mad_agent: QP %d not supported\n", qpn);
330 ret = ERR_PTR(-EPROTONOSUPPORT);
331 goto error1;
332 }
333
334 /* Allocate structures */
335 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
336 if (!mad_agent_priv) {
337 ret = ERR_PTR(-ENOMEM);
338 goto error1;
339 }
340
341 if (mad_reg_req) {
342 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
343 if (!reg_req) {
344 ret = ERR_PTR(-ENOMEM);
345 goto error3;
346 }
347 }
348
349 /* Now, fill in the various structures */
350 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
351 mad_agent_priv->reg_req = reg_req;
352 mad_agent_priv->agent.rmpp_version = rmpp_version;
353 mad_agent_priv->agent.device = device;
354 mad_agent_priv->agent.recv_handler = recv_handler;
355 mad_agent_priv->agent.send_handler = send_handler;
356 mad_agent_priv->agent.context = context;
357 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
358 mad_agent_priv->agent.port_num = port_num;
359 mad_agent_priv->agent.flags = registration_flags;
360 spin_lock_init(&mad_agent_priv->lock);
361 INIT_LIST_HEAD(&mad_agent_priv->send_list);
362 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
363 INIT_LIST_HEAD(&mad_agent_priv->done_list);
364 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
365 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
366 INIT_LIST_HEAD(&mad_agent_priv->local_list);
367 INIT_WORK(&mad_agent_priv->local_work, local_completions);
368 atomic_set(&mad_agent_priv->refcount, 1);
369 init_completion(&mad_agent_priv->comp);
370
371 spin_lock_irqsave(&port_priv->reg_lock, flags);
372 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
373
374 /*
375 * Make sure MAD registration (if supplied)
376 * is non overlapping with any existing ones
377 */
378 if (mad_reg_req) {
379 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
380 if (!is_vendor_class(mgmt_class)) {
381 class = port_priv->version[mad_reg_req->
382 mgmt_class_version].class;
383 if (class) {
384 method = class->method_table[mgmt_class];
385 if (method) {
386 if (method_in_use(&method,
387 mad_reg_req))
388 goto error4;
389 }
390 }
391 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
392 mgmt_class);
393 } else {
394 /* "New" vendor class range */
395 vendor = port_priv->version[mad_reg_req->
396 mgmt_class_version].vendor;
397 if (vendor) {
398 vclass = vendor_class_index(mgmt_class);
399 vendor_class = vendor->vendor_class[vclass];
400 if (vendor_class) {
401 if (is_vendor_method_in_use(
402 vendor_class,
403 mad_reg_req))
404 goto error4;
405 }
406 }
407 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
408 }
409 if (ret2) {
410 ret = ERR_PTR(ret2);
411 goto error4;
412 }
413 }
414
415 /* Add mad agent into port's agent list */
416 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
417 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
418
419 return &mad_agent_priv->agent;
420
421 error4:
422 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
423 kfree(reg_req);
424 error3:
425 kfree(mad_agent_priv);
426 error1:
427 return ret;
428 }
429 EXPORT_SYMBOL(ib_register_mad_agent);
430
is_snooping_sends(int mad_snoop_flags)431 static inline int is_snooping_sends(int mad_snoop_flags)
432 {
433 return (mad_snoop_flags &
434 (/*IB_MAD_SNOOP_POSTED_SENDS |
435 IB_MAD_SNOOP_RMPP_SENDS |*/
436 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
437 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
438 }
439
is_snooping_recvs(int mad_snoop_flags)440 static inline int is_snooping_recvs(int mad_snoop_flags)
441 {
442 return (mad_snoop_flags &
443 (IB_MAD_SNOOP_RECVS /*|
444 IB_MAD_SNOOP_RMPP_RECVS*/));
445 }
446
register_snoop_agent(struct ib_mad_qp_info * qp_info,struct ib_mad_snoop_private * mad_snoop_priv)447 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
448 struct ib_mad_snoop_private *mad_snoop_priv)
449 {
450 struct ib_mad_snoop_private **new_snoop_table;
451 unsigned long flags;
452 int i;
453
454 spin_lock_irqsave(&qp_info->snoop_lock, flags);
455 /* Check for empty slot in array. */
456 for (i = 0; i < qp_info->snoop_table_size; i++)
457 if (!qp_info->snoop_table[i])
458 break;
459
460 if (i == qp_info->snoop_table_size) {
461 /* Grow table. */
462 new_snoop_table = krealloc(qp_info->snoop_table,
463 sizeof mad_snoop_priv *
464 (qp_info->snoop_table_size + 1),
465 GFP_ATOMIC);
466 if (!new_snoop_table) {
467 i = -ENOMEM;
468 goto out;
469 }
470
471 qp_info->snoop_table = new_snoop_table;
472 qp_info->snoop_table_size++;
473 }
474 qp_info->snoop_table[i] = mad_snoop_priv;
475 atomic_inc(&qp_info->snoop_count);
476 out:
477 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
478 return i;
479 }
480
ib_register_mad_snoop(struct ib_device * device,u8 port_num,enum ib_qp_type qp_type,int mad_snoop_flags,ib_mad_snoop_handler snoop_handler,ib_mad_recv_handler recv_handler,void * context)481 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
482 u8 port_num,
483 enum ib_qp_type qp_type,
484 int mad_snoop_flags,
485 ib_mad_snoop_handler snoop_handler,
486 ib_mad_recv_handler recv_handler,
487 void *context)
488 {
489 struct ib_mad_port_private *port_priv;
490 struct ib_mad_agent *ret;
491 struct ib_mad_snoop_private *mad_snoop_priv;
492 int qpn;
493
494 /* Validate parameters */
495 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
496 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
497 ret = ERR_PTR(-EINVAL);
498 goto error1;
499 }
500 qpn = get_spl_qp_index(qp_type);
501 if (qpn == -1) {
502 ret = ERR_PTR(-EINVAL);
503 goto error1;
504 }
505 port_priv = ib_get_mad_port(device, port_num);
506 if (!port_priv) {
507 ret = ERR_PTR(-ENODEV);
508 goto error1;
509 }
510 /* Allocate structures */
511 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
512 if (!mad_snoop_priv) {
513 ret = ERR_PTR(-ENOMEM);
514 goto error1;
515 }
516
517 /* Now, fill in the various structures */
518 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
519 mad_snoop_priv->agent.device = device;
520 mad_snoop_priv->agent.recv_handler = recv_handler;
521 mad_snoop_priv->agent.snoop_handler = snoop_handler;
522 mad_snoop_priv->agent.context = context;
523 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
524 mad_snoop_priv->agent.port_num = port_num;
525 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
526 init_completion(&mad_snoop_priv->comp);
527 mad_snoop_priv->snoop_index = register_snoop_agent(
528 &port_priv->qp_info[qpn],
529 mad_snoop_priv);
530 if (mad_snoop_priv->snoop_index < 0) {
531 ret = ERR_PTR(mad_snoop_priv->snoop_index);
532 goto error2;
533 }
534
535 atomic_set(&mad_snoop_priv->refcount, 1);
536 return &mad_snoop_priv->agent;
537
538 error2:
539 kfree(mad_snoop_priv);
540 error1:
541 return ret;
542 }
543 EXPORT_SYMBOL(ib_register_mad_snoop);
544
deref_mad_agent(struct ib_mad_agent_private * mad_agent_priv)545 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
546 {
547 if (atomic_dec_and_test(&mad_agent_priv->refcount))
548 complete(&mad_agent_priv->comp);
549 }
550
deref_snoop_agent(struct ib_mad_snoop_private * mad_snoop_priv)551 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
552 {
553 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
554 complete(&mad_snoop_priv->comp);
555 }
556
unregister_mad_agent(struct ib_mad_agent_private * mad_agent_priv)557 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
558 {
559 struct ib_mad_port_private *port_priv;
560 unsigned long flags;
561
562 /* Note that we could still be handling received MADs */
563
564 /*
565 * Canceling all sends results in dropping received response
566 * MADs, preventing us from queuing additional work
567 */
568 cancel_mads(mad_agent_priv);
569 port_priv = mad_agent_priv->qp_info->port_priv;
570 cancel_delayed_work(&mad_agent_priv->timed_work);
571
572 spin_lock_irqsave(&port_priv->reg_lock, flags);
573 remove_mad_reg_req(mad_agent_priv);
574 list_del(&mad_agent_priv->agent_list);
575 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
576
577 flush_workqueue(port_priv->wq);
578 ib_cancel_rmpp_recvs(mad_agent_priv);
579
580 deref_mad_agent(mad_agent_priv);
581 wait_for_completion(&mad_agent_priv->comp);
582
583 kfree(mad_agent_priv->reg_req);
584 kfree(mad_agent_priv);
585 }
586
unregister_mad_snoop(struct ib_mad_snoop_private * mad_snoop_priv)587 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
588 {
589 struct ib_mad_qp_info *qp_info;
590 unsigned long flags;
591
592 qp_info = mad_snoop_priv->qp_info;
593 spin_lock_irqsave(&qp_info->snoop_lock, flags);
594 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
595 atomic_dec(&qp_info->snoop_count);
596 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
597
598 deref_snoop_agent(mad_snoop_priv);
599 wait_for_completion(&mad_snoop_priv->comp);
600
601 kfree(mad_snoop_priv);
602 }
603
604 /*
605 * ib_unregister_mad_agent - Unregisters a client from using MAD services
606 */
ib_unregister_mad_agent(struct ib_mad_agent * mad_agent)607 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
608 {
609 struct ib_mad_agent_private *mad_agent_priv;
610 struct ib_mad_snoop_private *mad_snoop_priv;
611
612 /* If the TID is zero, the agent can only snoop. */
613 if (mad_agent->hi_tid) {
614 mad_agent_priv = container_of(mad_agent,
615 struct ib_mad_agent_private,
616 agent);
617 unregister_mad_agent(mad_agent_priv);
618 } else {
619 mad_snoop_priv = container_of(mad_agent,
620 struct ib_mad_snoop_private,
621 agent);
622 unregister_mad_snoop(mad_snoop_priv);
623 }
624 return 0;
625 }
626 EXPORT_SYMBOL(ib_unregister_mad_agent);
627
dequeue_mad(struct ib_mad_list_head * mad_list)628 static void dequeue_mad(struct ib_mad_list_head *mad_list)
629 {
630 struct ib_mad_queue *mad_queue;
631 unsigned long flags;
632
633 BUG_ON(!mad_list->mad_queue);
634 mad_queue = mad_list->mad_queue;
635 spin_lock_irqsave(&mad_queue->lock, flags);
636 list_del(&mad_list->list);
637 mad_queue->count--;
638 spin_unlock_irqrestore(&mad_queue->lock, flags);
639 }
640
snoop_send(struct ib_mad_qp_info * qp_info,struct ib_mad_send_buf * send_buf,struct ib_mad_send_wc * mad_send_wc,int mad_snoop_flags)641 static void snoop_send(struct ib_mad_qp_info *qp_info,
642 struct ib_mad_send_buf *send_buf,
643 struct ib_mad_send_wc *mad_send_wc,
644 int mad_snoop_flags)
645 {
646 struct ib_mad_snoop_private *mad_snoop_priv;
647 unsigned long flags;
648 int i;
649
650 spin_lock_irqsave(&qp_info->snoop_lock, flags);
651 for (i = 0; i < qp_info->snoop_table_size; i++) {
652 mad_snoop_priv = qp_info->snoop_table[i];
653 if (!mad_snoop_priv ||
654 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
655 continue;
656
657 atomic_inc(&mad_snoop_priv->refcount);
658 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
659 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
660 send_buf, mad_send_wc);
661 deref_snoop_agent(mad_snoop_priv);
662 spin_lock_irqsave(&qp_info->snoop_lock, flags);
663 }
664 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
665 }
666
snoop_recv(struct ib_mad_qp_info * qp_info,struct ib_mad_recv_wc * mad_recv_wc,int mad_snoop_flags)667 static void snoop_recv(struct ib_mad_qp_info *qp_info,
668 struct ib_mad_recv_wc *mad_recv_wc,
669 int mad_snoop_flags)
670 {
671 struct ib_mad_snoop_private *mad_snoop_priv;
672 unsigned long flags;
673 int i;
674
675 spin_lock_irqsave(&qp_info->snoop_lock, flags);
676 for (i = 0; i < qp_info->snoop_table_size; i++) {
677 mad_snoop_priv = qp_info->snoop_table[i];
678 if (!mad_snoop_priv ||
679 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
680 continue;
681
682 atomic_inc(&mad_snoop_priv->refcount);
683 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
684 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
685 mad_recv_wc);
686 deref_snoop_agent(mad_snoop_priv);
687 spin_lock_irqsave(&qp_info->snoop_lock, flags);
688 }
689 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
690 }
691
build_smp_wc(struct ib_qp * qp,u64 wr_id,u16 slid,u16 pkey_index,u8 port_num,struct ib_wc * wc)692 static void build_smp_wc(struct ib_qp *qp,
693 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
694 struct ib_wc *wc)
695 {
696 memset(wc, 0, sizeof *wc);
697 wc->wr_id = wr_id;
698 wc->status = IB_WC_SUCCESS;
699 wc->opcode = IB_WC_RECV;
700 wc->pkey_index = pkey_index;
701 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
702 wc->src_qp = IB_QP0;
703 wc->qp = qp;
704 wc->slid = slid;
705 wc->sl = 0;
706 wc->dlid_path_bits = 0;
707 wc->port_num = port_num;
708 }
709
mad_priv_size(const struct ib_mad_private * mp)710 static size_t mad_priv_size(const struct ib_mad_private *mp)
711 {
712 return sizeof(struct ib_mad_private) + mp->mad_size;
713 }
714
alloc_mad_private(size_t mad_size,gfp_t flags)715 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
716 {
717 size_t size = sizeof(struct ib_mad_private) + mad_size;
718 struct ib_mad_private *ret = kzalloc(size, flags);
719
720 if (ret)
721 ret->mad_size = mad_size;
722
723 return ret;
724 }
725
port_mad_size(const struct ib_mad_port_private * port_priv)726 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
727 {
728 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
729 }
730
mad_priv_dma_size(const struct ib_mad_private * mp)731 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
732 {
733 return sizeof(struct ib_grh) + mp->mad_size;
734 }
735
736 /*
737 * Return 0 if SMP is to be sent
738 * Return 1 if SMP was consumed locally (whether or not solicited)
739 * Return < 0 if error
740 */
handle_outgoing_dr_smp(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_wr_private * mad_send_wr)741 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
742 struct ib_mad_send_wr_private *mad_send_wr)
743 {
744 int ret = 0;
745 struct ib_smp *smp = mad_send_wr->send_buf.mad;
746 struct opa_smp *opa_smp = (struct opa_smp *)smp;
747 unsigned long flags;
748 struct ib_mad_local_private *local;
749 struct ib_mad_private *mad_priv;
750 struct ib_mad_port_private *port_priv;
751 struct ib_mad_agent_private *recv_mad_agent = NULL;
752 struct ib_device *device = mad_agent_priv->agent.device;
753 u8 port_num;
754 struct ib_wc mad_wc;
755 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
756 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
757 u16 out_mad_pkey_index = 0;
758 u16 drslid;
759 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
760 mad_agent_priv->qp_info->port_priv->port_num);
761
762 if (rdma_cap_ib_switch(device) &&
763 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
764 port_num = send_wr->port_num;
765 else
766 port_num = mad_agent_priv->agent.port_num;
767
768 /*
769 * Directed route handling starts if the initial LID routed part of
770 * a request or the ending LID routed part of a response is empty.
771 * If we are at the start of the LID routed part, don't update the
772 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
773 */
774 if (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
775 u32 opa_drslid;
776
777 if ((opa_get_smp_direction(opa_smp)
778 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
779 OPA_LID_PERMISSIVE &&
780 opa_smi_handle_dr_smp_send(opa_smp,
781 rdma_cap_ib_switch(device),
782 port_num) == IB_SMI_DISCARD) {
783 ret = -EINVAL;
784 dev_err(&device->dev, "OPA Invalid directed route\n");
785 goto out;
786 }
787 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
788 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
789 opa_drslid & 0xffff0000) {
790 ret = -EINVAL;
791 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
792 opa_drslid);
793 goto out;
794 }
795 drslid = (u16)(opa_drslid & 0x0000ffff);
796
797 /* Check to post send on QP or process locally */
798 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
799 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
800 goto out;
801 } else {
802 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
803 IB_LID_PERMISSIVE &&
804 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
805 IB_SMI_DISCARD) {
806 ret = -EINVAL;
807 dev_err(&device->dev, "Invalid directed route\n");
808 goto out;
809 }
810 drslid = be16_to_cpu(smp->dr_slid);
811
812 /* Check to post send on QP or process locally */
813 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
814 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
815 goto out;
816 }
817
818 local = kmalloc(sizeof *local, GFP_ATOMIC);
819 if (!local) {
820 ret = -ENOMEM;
821 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
822 goto out;
823 }
824 local->mad_priv = NULL;
825 local->recv_mad_agent = NULL;
826 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
827 if (!mad_priv) {
828 ret = -ENOMEM;
829 dev_err(&device->dev, "No memory for local response MAD\n");
830 kfree(local);
831 goto out;
832 }
833
834 build_smp_wc(mad_agent_priv->agent.qp,
835 send_wr->wr.wr_id, drslid,
836 send_wr->pkey_index,
837 send_wr->port_num, &mad_wc);
838
839 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
840 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
841 + mad_send_wr->send_buf.data_len
842 + sizeof(struct ib_grh);
843 }
844
845 /* No GRH for DR SMP */
846 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
847 (const struct ib_mad_hdr *)smp, mad_size,
848 (struct ib_mad_hdr *)mad_priv->mad,
849 &mad_size, &out_mad_pkey_index);
850 switch (ret)
851 {
852 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
853 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
854 mad_agent_priv->agent.recv_handler) {
855 local->mad_priv = mad_priv;
856 local->recv_mad_agent = mad_agent_priv;
857 /*
858 * Reference MAD agent until receive
859 * side of local completion handled
860 */
861 atomic_inc(&mad_agent_priv->refcount);
862 } else
863 kfree(mad_priv);
864 break;
865 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
866 kfree(mad_priv);
867 break;
868 case IB_MAD_RESULT_SUCCESS:
869 /* Treat like an incoming receive MAD */
870 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
871 mad_agent_priv->agent.port_num);
872 if (port_priv) {
873 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
874 recv_mad_agent = find_mad_agent(port_priv,
875 (const struct ib_mad_hdr *)mad_priv->mad);
876 }
877 if (!port_priv || !recv_mad_agent) {
878 /*
879 * No receiving agent so drop packet and
880 * generate send completion.
881 */
882 kfree(mad_priv);
883 break;
884 }
885 local->mad_priv = mad_priv;
886 local->recv_mad_agent = recv_mad_agent;
887 break;
888 default:
889 kfree(mad_priv);
890 kfree(local);
891 ret = -EINVAL;
892 goto out;
893 }
894
895 local->mad_send_wr = mad_send_wr;
896 if (opa) {
897 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
898 local->return_wc_byte_len = mad_size;
899 }
900 /* Reference MAD agent until send side of local completion handled */
901 atomic_inc(&mad_agent_priv->refcount);
902 /* Queue local completion to local list */
903 spin_lock_irqsave(&mad_agent_priv->lock, flags);
904 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
905 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
906 queue_work(mad_agent_priv->qp_info->port_priv->wq,
907 &mad_agent_priv->local_work);
908 ret = 1;
909 out:
910 return ret;
911 }
912
get_pad_size(int hdr_len,int data_len,size_t mad_size)913 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
914 {
915 int seg_size, pad;
916
917 seg_size = mad_size - hdr_len;
918 if (data_len && seg_size) {
919 pad = seg_size - data_len % seg_size;
920 return pad == seg_size ? 0 : pad;
921 } else
922 return seg_size;
923 }
924
free_send_rmpp_list(struct ib_mad_send_wr_private * mad_send_wr)925 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
926 {
927 struct ib_rmpp_segment *s, *t;
928
929 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
930 list_del(&s->list);
931 kfree(s);
932 }
933 }
934
alloc_send_rmpp_list(struct ib_mad_send_wr_private * send_wr,size_t mad_size,gfp_t gfp_mask)935 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
936 size_t mad_size, gfp_t gfp_mask)
937 {
938 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
939 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
940 struct ib_rmpp_segment *seg = NULL;
941 int left, seg_size, pad;
942
943 send_buf->seg_size = mad_size - send_buf->hdr_len;
944 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
945 seg_size = send_buf->seg_size;
946 pad = send_wr->pad;
947
948 /* Allocate data segments. */
949 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
950 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
951 if (!seg) {
952 dev_err(&send_buf->mad_agent->device->dev,
953 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
954 sizeof (*seg) + seg_size, gfp_mask);
955 free_send_rmpp_list(send_wr);
956 return -ENOMEM;
957 }
958 seg->num = ++send_buf->seg_count;
959 list_add_tail(&seg->list, &send_wr->rmpp_list);
960 }
961
962 /* Zero any padding */
963 if (pad)
964 memset(seg->data + seg_size - pad, 0, pad);
965
966 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
967 agent.rmpp_version;
968 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
969 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
970
971 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
972 struct ib_rmpp_segment, list);
973 send_wr->last_ack_seg = send_wr->cur_seg;
974 return 0;
975 }
976
ib_mad_kernel_rmpp_agent(const struct ib_mad_agent * agent)977 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
978 {
979 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
980 }
981 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
982
ib_create_send_mad(struct ib_mad_agent * mad_agent,u32 remote_qpn,u16 pkey_index,int rmpp_active,int hdr_len,int data_len,gfp_t gfp_mask,u8 base_version)983 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
984 u32 remote_qpn, u16 pkey_index,
985 int rmpp_active,
986 int hdr_len, int data_len,
987 gfp_t gfp_mask,
988 u8 base_version)
989 {
990 struct ib_mad_agent_private *mad_agent_priv;
991 struct ib_mad_send_wr_private *mad_send_wr;
992 int pad, message_size, ret, size;
993 void *buf;
994 size_t mad_size;
995 bool opa;
996
997 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
998 agent);
999
1000 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1001
1002 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1003 mad_size = sizeof(struct opa_mad);
1004 else
1005 mad_size = sizeof(struct ib_mad);
1006
1007 pad = get_pad_size(hdr_len, data_len, mad_size);
1008 message_size = hdr_len + data_len + pad;
1009
1010 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1011 if (!rmpp_active && message_size > mad_size)
1012 return ERR_PTR(-EINVAL);
1013 } else
1014 if (rmpp_active || message_size > mad_size)
1015 return ERR_PTR(-EINVAL);
1016
1017 size = rmpp_active ? hdr_len : mad_size;
1018 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1019 if (!buf)
1020 return ERR_PTR(-ENOMEM);
1021
1022 mad_send_wr = buf + size;
1023 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1024 mad_send_wr->send_buf.mad = buf;
1025 mad_send_wr->send_buf.hdr_len = hdr_len;
1026 mad_send_wr->send_buf.data_len = data_len;
1027 mad_send_wr->pad = pad;
1028
1029 mad_send_wr->mad_agent_priv = mad_agent_priv;
1030 mad_send_wr->sg_list[0].length = hdr_len;
1031 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1032
1033 /* OPA MADs don't have to be the full 2048 bytes */
1034 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1035 data_len < mad_size - hdr_len)
1036 mad_send_wr->sg_list[1].length = data_len;
1037 else
1038 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1039
1040 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1041
1042 mad_send_wr->send_wr.wr.wr_id = (unsigned long) mad_send_wr;
1043 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1044 mad_send_wr->send_wr.wr.num_sge = 2;
1045 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1046 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1047 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1048 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1049 mad_send_wr->send_wr.pkey_index = pkey_index;
1050
1051 if (rmpp_active) {
1052 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1053 if (ret) {
1054 kfree(buf);
1055 return ERR_PTR(ret);
1056 }
1057 }
1058
1059 mad_send_wr->send_buf.mad_agent = mad_agent;
1060 atomic_inc(&mad_agent_priv->refcount);
1061 return &mad_send_wr->send_buf;
1062 }
1063 EXPORT_SYMBOL(ib_create_send_mad);
1064
ib_get_mad_data_offset(u8 mgmt_class)1065 int ib_get_mad_data_offset(u8 mgmt_class)
1066 {
1067 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1068 return IB_MGMT_SA_HDR;
1069 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1070 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1071 (mgmt_class == IB_MGMT_CLASS_BIS))
1072 return IB_MGMT_DEVICE_HDR;
1073 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1074 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1075 return IB_MGMT_VENDOR_HDR;
1076 else
1077 return IB_MGMT_MAD_HDR;
1078 }
1079 EXPORT_SYMBOL(ib_get_mad_data_offset);
1080
ib_is_mad_class_rmpp(u8 mgmt_class)1081 int ib_is_mad_class_rmpp(u8 mgmt_class)
1082 {
1083 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1084 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1085 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1086 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1087 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1088 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1089 return 1;
1090 return 0;
1091 }
1092 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1093
ib_get_rmpp_segment(struct ib_mad_send_buf * send_buf,int seg_num)1094 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1095 {
1096 struct ib_mad_send_wr_private *mad_send_wr;
1097 struct list_head *list;
1098
1099 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1100 send_buf);
1101 list = &mad_send_wr->cur_seg->list;
1102
1103 if (mad_send_wr->cur_seg->num < seg_num) {
1104 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1105 if (mad_send_wr->cur_seg->num == seg_num)
1106 break;
1107 } else if (mad_send_wr->cur_seg->num > seg_num) {
1108 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1109 if (mad_send_wr->cur_seg->num == seg_num)
1110 break;
1111 }
1112 return mad_send_wr->cur_seg->data;
1113 }
1114 EXPORT_SYMBOL(ib_get_rmpp_segment);
1115
ib_get_payload(struct ib_mad_send_wr_private * mad_send_wr)1116 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1117 {
1118 if (mad_send_wr->send_buf.seg_count)
1119 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1120 mad_send_wr->seg_num);
1121 else
1122 return mad_send_wr->send_buf.mad +
1123 mad_send_wr->send_buf.hdr_len;
1124 }
1125
ib_free_send_mad(struct ib_mad_send_buf * send_buf)1126 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1127 {
1128 struct ib_mad_agent_private *mad_agent_priv;
1129 struct ib_mad_send_wr_private *mad_send_wr;
1130
1131 mad_agent_priv = container_of(send_buf->mad_agent,
1132 struct ib_mad_agent_private, agent);
1133 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1134 send_buf);
1135
1136 free_send_rmpp_list(mad_send_wr);
1137 kfree(send_buf->mad);
1138 deref_mad_agent(mad_agent_priv);
1139 }
1140 EXPORT_SYMBOL(ib_free_send_mad);
1141
ib_send_mad(struct ib_mad_send_wr_private * mad_send_wr)1142 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1143 {
1144 struct ib_mad_qp_info *qp_info;
1145 struct list_head *list;
1146 struct ib_send_wr *bad_send_wr;
1147 struct ib_mad_agent *mad_agent;
1148 struct ib_sge *sge;
1149 unsigned long flags;
1150 int ret;
1151
1152 /* Set WR ID to find mad_send_wr upon completion */
1153 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1154 mad_send_wr->send_wr.wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1155 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1156
1157 mad_agent = mad_send_wr->send_buf.mad_agent;
1158 sge = mad_send_wr->sg_list;
1159 sge[0].addr = ib_dma_map_single(mad_agent->device,
1160 mad_send_wr->send_buf.mad,
1161 sge[0].length,
1162 DMA_TO_DEVICE);
1163 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1164 return -ENOMEM;
1165
1166 mad_send_wr->header_mapping = sge[0].addr;
1167
1168 sge[1].addr = ib_dma_map_single(mad_agent->device,
1169 ib_get_payload(mad_send_wr),
1170 sge[1].length,
1171 DMA_TO_DEVICE);
1172 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1173 ib_dma_unmap_single(mad_agent->device,
1174 mad_send_wr->header_mapping,
1175 sge[0].length, DMA_TO_DEVICE);
1176 return -ENOMEM;
1177 }
1178 mad_send_wr->payload_mapping = sge[1].addr;
1179
1180 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1181 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1182 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1183 &bad_send_wr);
1184 list = &qp_info->send_queue.list;
1185 } else {
1186 ret = 0;
1187 list = &qp_info->overflow_list;
1188 }
1189
1190 if (!ret) {
1191 qp_info->send_queue.count++;
1192 list_add_tail(&mad_send_wr->mad_list.list, list);
1193 }
1194 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1195 if (ret) {
1196 ib_dma_unmap_single(mad_agent->device,
1197 mad_send_wr->header_mapping,
1198 sge[0].length, DMA_TO_DEVICE);
1199 ib_dma_unmap_single(mad_agent->device,
1200 mad_send_wr->payload_mapping,
1201 sge[1].length, DMA_TO_DEVICE);
1202 }
1203 return ret;
1204 }
1205
1206 /*
1207 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1208 * with the registered client
1209 */
ib_post_send_mad(struct ib_mad_send_buf * send_buf,struct ib_mad_send_buf ** bad_send_buf)1210 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1211 struct ib_mad_send_buf **bad_send_buf)
1212 {
1213 struct ib_mad_agent_private *mad_agent_priv;
1214 struct ib_mad_send_buf *next_send_buf;
1215 struct ib_mad_send_wr_private *mad_send_wr;
1216 unsigned long flags;
1217 int ret = -EINVAL;
1218
1219 /* Walk list of send WRs and post each on send list */
1220 for (; send_buf; send_buf = next_send_buf) {
1221
1222 mad_send_wr = container_of(send_buf,
1223 struct ib_mad_send_wr_private,
1224 send_buf);
1225 mad_agent_priv = mad_send_wr->mad_agent_priv;
1226
1227 if (!send_buf->mad_agent->send_handler ||
1228 (send_buf->timeout_ms &&
1229 !send_buf->mad_agent->recv_handler)) {
1230 ret = -EINVAL;
1231 goto error;
1232 }
1233
1234 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1235 if (mad_agent_priv->agent.rmpp_version) {
1236 ret = -EINVAL;
1237 goto error;
1238 }
1239 }
1240
1241 /*
1242 * Save pointer to next work request to post in case the
1243 * current one completes, and the user modifies the work
1244 * request associated with the completion
1245 */
1246 next_send_buf = send_buf->next;
1247 mad_send_wr->send_wr.ah = send_buf->ah;
1248
1249 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1250 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1251 ret = handle_outgoing_dr_smp(mad_agent_priv,
1252 mad_send_wr);
1253 if (ret < 0) /* error */
1254 goto error;
1255 else if (ret == 1) /* locally consumed */
1256 continue;
1257 }
1258
1259 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1260 /* Timeout will be updated after send completes */
1261 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1262 mad_send_wr->max_retries = send_buf->retries;
1263 mad_send_wr->retries_left = send_buf->retries;
1264 send_buf->retries = 0;
1265 /* Reference for work request to QP + response */
1266 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1267 mad_send_wr->status = IB_WC_SUCCESS;
1268
1269 /* Reference MAD agent until send completes */
1270 atomic_inc(&mad_agent_priv->refcount);
1271 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1272 list_add_tail(&mad_send_wr->agent_list,
1273 &mad_agent_priv->send_list);
1274 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1275
1276 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1277 ret = ib_send_rmpp_mad(mad_send_wr);
1278 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1279 ret = ib_send_mad(mad_send_wr);
1280 } else
1281 ret = ib_send_mad(mad_send_wr);
1282 if (ret < 0) {
1283 /* Fail send request */
1284 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1285 list_del(&mad_send_wr->agent_list);
1286 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1287 atomic_dec(&mad_agent_priv->refcount);
1288 goto error;
1289 }
1290 }
1291 return 0;
1292 error:
1293 if (bad_send_buf)
1294 *bad_send_buf = send_buf;
1295 return ret;
1296 }
1297 EXPORT_SYMBOL(ib_post_send_mad);
1298
1299 /*
1300 * ib_free_recv_mad - Returns data buffers used to receive
1301 * a MAD to the access layer
1302 */
ib_free_recv_mad(struct ib_mad_recv_wc * mad_recv_wc)1303 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1304 {
1305 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1306 struct ib_mad_private_header *mad_priv_hdr;
1307 struct ib_mad_private *priv;
1308 struct list_head free_list;
1309
1310 INIT_LIST_HEAD(&free_list);
1311 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1312
1313 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1314 &free_list, list) {
1315 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1316 recv_buf);
1317 mad_priv_hdr = container_of(mad_recv_wc,
1318 struct ib_mad_private_header,
1319 recv_wc);
1320 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1321 header);
1322 kfree(priv);
1323 }
1324 }
1325 EXPORT_SYMBOL(ib_free_recv_mad);
1326
ib_redirect_mad_qp(struct ib_qp * qp,u8 rmpp_version,ib_mad_send_handler send_handler,ib_mad_recv_handler recv_handler,void * context)1327 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1328 u8 rmpp_version,
1329 ib_mad_send_handler send_handler,
1330 ib_mad_recv_handler recv_handler,
1331 void *context)
1332 {
1333 return ERR_PTR(-EINVAL); /* XXX: for now */
1334 }
1335 EXPORT_SYMBOL(ib_redirect_mad_qp);
1336
ib_process_mad_wc(struct ib_mad_agent * mad_agent,struct ib_wc * wc)1337 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1338 struct ib_wc *wc)
1339 {
1340 dev_err(&mad_agent->device->dev,
1341 "ib_process_mad_wc() not implemented yet\n");
1342 return 0;
1343 }
1344 EXPORT_SYMBOL(ib_process_mad_wc);
1345
method_in_use(struct ib_mad_mgmt_method_table ** method,struct ib_mad_reg_req * mad_reg_req)1346 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1347 struct ib_mad_reg_req *mad_reg_req)
1348 {
1349 int i;
1350
1351 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1352 if ((*method)->agent[i]) {
1353 pr_err("Method %d already in use\n", i);
1354 return -EINVAL;
1355 }
1356 }
1357 return 0;
1358 }
1359
allocate_method_table(struct ib_mad_mgmt_method_table ** method)1360 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1361 {
1362 /* Allocate management method table */
1363 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1364 if (!*method) {
1365 pr_err("No memory for ib_mad_mgmt_method_table\n");
1366 return -ENOMEM;
1367 }
1368
1369 return 0;
1370 }
1371
1372 /*
1373 * Check to see if there are any methods still in use
1374 */
check_method_table(struct ib_mad_mgmt_method_table * method)1375 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1376 {
1377 int i;
1378
1379 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1380 if (method->agent[i])
1381 return 1;
1382 return 0;
1383 }
1384
1385 /*
1386 * Check to see if there are any method tables for this class still in use
1387 */
check_class_table(struct ib_mad_mgmt_class_table * class)1388 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1389 {
1390 int i;
1391
1392 for (i = 0; i < MAX_MGMT_CLASS; i++)
1393 if (class->method_table[i])
1394 return 1;
1395 return 0;
1396 }
1397
check_vendor_class(struct ib_mad_mgmt_vendor_class * vendor_class)1398 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1399 {
1400 int i;
1401
1402 for (i = 0; i < MAX_MGMT_OUI; i++)
1403 if (vendor_class->method_table[i])
1404 return 1;
1405 return 0;
1406 }
1407
find_vendor_oui(struct ib_mad_mgmt_vendor_class * vendor_class,const char * oui)1408 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1409 const char *oui)
1410 {
1411 int i;
1412
1413 for (i = 0; i < MAX_MGMT_OUI; i++)
1414 /* Is there matching OUI for this vendor class ? */
1415 if (!memcmp(vendor_class->oui[i], oui, 3))
1416 return i;
1417
1418 return -1;
1419 }
1420
check_vendor_table(struct ib_mad_mgmt_vendor_class_table * vendor)1421 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1422 {
1423 int i;
1424
1425 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1426 if (vendor->vendor_class[i])
1427 return 1;
1428
1429 return 0;
1430 }
1431
remove_methods_mad_agent(struct ib_mad_mgmt_method_table * method,struct ib_mad_agent_private * agent)1432 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1433 struct ib_mad_agent_private *agent)
1434 {
1435 int i;
1436
1437 /* Remove any methods for this mad agent */
1438 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1439 if (method->agent[i] == agent) {
1440 method->agent[i] = NULL;
1441 }
1442 }
1443 }
1444
add_nonoui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv,u8 mgmt_class)1445 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1446 struct ib_mad_agent_private *agent_priv,
1447 u8 mgmt_class)
1448 {
1449 struct ib_mad_port_private *port_priv;
1450 struct ib_mad_mgmt_class_table **class;
1451 struct ib_mad_mgmt_method_table **method;
1452 int i, ret;
1453
1454 port_priv = agent_priv->qp_info->port_priv;
1455 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1456 if (!*class) {
1457 /* Allocate management class table for "new" class version */
1458 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1459 if (!*class) {
1460 dev_err(&agent_priv->agent.device->dev,
1461 "No memory for ib_mad_mgmt_class_table\n");
1462 ret = -ENOMEM;
1463 goto error1;
1464 }
1465
1466 /* Allocate method table for this management class */
1467 method = &(*class)->method_table[mgmt_class];
1468 if ((ret = allocate_method_table(method)))
1469 goto error2;
1470 } else {
1471 method = &(*class)->method_table[mgmt_class];
1472 if (!*method) {
1473 /* Allocate method table for this management class */
1474 if ((ret = allocate_method_table(method)))
1475 goto error1;
1476 }
1477 }
1478
1479 /* Now, make sure methods are not already in use */
1480 if (method_in_use(method, mad_reg_req))
1481 goto error3;
1482
1483 /* Finally, add in methods being registered */
1484 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1485 (*method)->agent[i] = agent_priv;
1486
1487 return 0;
1488
1489 error3:
1490 /* Remove any methods for this mad agent */
1491 remove_methods_mad_agent(*method, agent_priv);
1492 /* Now, check to see if there are any methods in use */
1493 if (!check_method_table(*method)) {
1494 /* If not, release management method table */
1495 kfree(*method);
1496 *method = NULL;
1497 }
1498 ret = -EINVAL;
1499 goto error1;
1500 error2:
1501 kfree(*class);
1502 *class = NULL;
1503 error1:
1504 return ret;
1505 }
1506
add_oui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv)1507 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1508 struct ib_mad_agent_private *agent_priv)
1509 {
1510 struct ib_mad_port_private *port_priv;
1511 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1512 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1513 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1514 struct ib_mad_mgmt_method_table **method;
1515 int i, ret = -ENOMEM;
1516 u8 vclass;
1517
1518 /* "New" vendor (with OUI) class */
1519 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1520 port_priv = agent_priv->qp_info->port_priv;
1521 vendor_table = &port_priv->version[
1522 mad_reg_req->mgmt_class_version].vendor;
1523 if (!*vendor_table) {
1524 /* Allocate mgmt vendor class table for "new" class version */
1525 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1526 if (!vendor) {
1527 dev_err(&agent_priv->agent.device->dev,
1528 "No memory for ib_mad_mgmt_vendor_class_table\n");
1529 goto error1;
1530 }
1531
1532 *vendor_table = vendor;
1533 }
1534 if (!(*vendor_table)->vendor_class[vclass]) {
1535 /* Allocate table for this management vendor class */
1536 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1537 if (!vendor_class) {
1538 dev_err(&agent_priv->agent.device->dev,
1539 "No memory for ib_mad_mgmt_vendor_class\n");
1540 goto error2;
1541 }
1542
1543 (*vendor_table)->vendor_class[vclass] = vendor_class;
1544 }
1545 for (i = 0; i < MAX_MGMT_OUI; i++) {
1546 /* Is there matching OUI for this vendor class ? */
1547 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1548 mad_reg_req->oui, 3)) {
1549 method = &(*vendor_table)->vendor_class[
1550 vclass]->method_table[i];
1551 if (!*method)
1552 goto error3;
1553 goto check_in_use;
1554 }
1555 }
1556 for (i = 0; i < MAX_MGMT_OUI; i++) {
1557 /* OUI slot available ? */
1558 if (!is_vendor_oui((*vendor_table)->vendor_class[
1559 vclass]->oui[i])) {
1560 method = &(*vendor_table)->vendor_class[
1561 vclass]->method_table[i];
1562 /* Allocate method table for this OUI */
1563 if (!*method) {
1564 ret = allocate_method_table(method);
1565 if (ret)
1566 goto error3;
1567 }
1568 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1569 mad_reg_req->oui, 3);
1570 goto check_in_use;
1571 }
1572 }
1573 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1574 goto error3;
1575
1576 check_in_use:
1577 /* Now, make sure methods are not already in use */
1578 if (method_in_use(method, mad_reg_req))
1579 goto error4;
1580
1581 /* Finally, add in methods being registered */
1582 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1583 (*method)->agent[i] = agent_priv;
1584
1585 return 0;
1586
1587 error4:
1588 /* Remove any methods for this mad agent */
1589 remove_methods_mad_agent(*method, agent_priv);
1590 /* Now, check to see if there are any methods in use */
1591 if (!check_method_table(*method)) {
1592 /* If not, release management method table */
1593 kfree(*method);
1594 *method = NULL;
1595 }
1596 ret = -EINVAL;
1597 error3:
1598 if (vendor_class) {
1599 (*vendor_table)->vendor_class[vclass] = NULL;
1600 kfree(vendor_class);
1601 }
1602 error2:
1603 if (vendor) {
1604 *vendor_table = NULL;
1605 kfree(vendor);
1606 }
1607 error1:
1608 return ret;
1609 }
1610
remove_mad_reg_req(struct ib_mad_agent_private * agent_priv)1611 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1612 {
1613 struct ib_mad_port_private *port_priv;
1614 struct ib_mad_mgmt_class_table *class;
1615 struct ib_mad_mgmt_method_table *method;
1616 struct ib_mad_mgmt_vendor_class_table *vendor;
1617 struct ib_mad_mgmt_vendor_class *vendor_class;
1618 int index;
1619 u8 mgmt_class;
1620
1621 /*
1622 * Was MAD registration request supplied
1623 * with original registration ?
1624 */
1625 if (!agent_priv->reg_req) {
1626 goto out;
1627 }
1628
1629 port_priv = agent_priv->qp_info->port_priv;
1630 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1631 class = port_priv->version[
1632 agent_priv->reg_req->mgmt_class_version].class;
1633 if (!class)
1634 goto vendor_check;
1635
1636 method = class->method_table[mgmt_class];
1637 if (method) {
1638 /* Remove any methods for this mad agent */
1639 remove_methods_mad_agent(method, agent_priv);
1640 /* Now, check to see if there are any methods still in use */
1641 if (!check_method_table(method)) {
1642 /* If not, release management method table */
1643 kfree(method);
1644 class->method_table[mgmt_class] = NULL;
1645 /* Any management classes left ? */
1646 if (!check_class_table(class)) {
1647 /* If not, release management class table */
1648 kfree(class);
1649 port_priv->version[
1650 agent_priv->reg_req->
1651 mgmt_class_version].class = NULL;
1652 }
1653 }
1654 }
1655
1656 vendor_check:
1657 if (!is_vendor_class(mgmt_class))
1658 goto out;
1659
1660 /* normalize mgmt_class to vendor range 2 */
1661 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1662 vendor = port_priv->version[
1663 agent_priv->reg_req->mgmt_class_version].vendor;
1664
1665 if (!vendor)
1666 goto out;
1667
1668 vendor_class = vendor->vendor_class[mgmt_class];
1669 if (vendor_class) {
1670 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1671 if (index < 0)
1672 goto out;
1673 method = vendor_class->method_table[index];
1674 if (method) {
1675 /* Remove any methods for this mad agent */
1676 remove_methods_mad_agent(method, agent_priv);
1677 /*
1678 * Now, check to see if there are
1679 * any methods still in use
1680 */
1681 if (!check_method_table(method)) {
1682 /* If not, release management method table */
1683 kfree(method);
1684 vendor_class->method_table[index] = NULL;
1685 memset(vendor_class->oui[index], 0, 3);
1686 /* Any OUIs left ? */
1687 if (!check_vendor_class(vendor_class)) {
1688 /* If not, release vendor class table */
1689 kfree(vendor_class);
1690 vendor->vendor_class[mgmt_class] = NULL;
1691 /* Any other vendor classes left ? */
1692 if (!check_vendor_table(vendor)) {
1693 kfree(vendor);
1694 port_priv->version[
1695 agent_priv->reg_req->
1696 mgmt_class_version].
1697 vendor = NULL;
1698 }
1699 }
1700 }
1701 }
1702 }
1703
1704 out:
1705 return;
1706 }
1707
1708 static struct ib_mad_agent_private *
find_mad_agent(struct ib_mad_port_private * port_priv,const struct ib_mad_hdr * mad_hdr)1709 find_mad_agent(struct ib_mad_port_private *port_priv,
1710 const struct ib_mad_hdr *mad_hdr)
1711 {
1712 struct ib_mad_agent_private *mad_agent = NULL;
1713 unsigned long flags;
1714
1715 spin_lock_irqsave(&port_priv->reg_lock, flags);
1716 if (ib_response_mad(mad_hdr)) {
1717 u32 hi_tid;
1718 struct ib_mad_agent_private *entry;
1719
1720 /*
1721 * Routing is based on high 32 bits of transaction ID
1722 * of MAD.
1723 */
1724 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1725 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1726 if (entry->agent.hi_tid == hi_tid) {
1727 mad_agent = entry;
1728 break;
1729 }
1730 }
1731 } else {
1732 struct ib_mad_mgmt_class_table *class;
1733 struct ib_mad_mgmt_method_table *method;
1734 struct ib_mad_mgmt_vendor_class_table *vendor;
1735 struct ib_mad_mgmt_vendor_class *vendor_class;
1736 const struct ib_vendor_mad *vendor_mad;
1737 int index;
1738
1739 /*
1740 * Routing is based on version, class, and method
1741 * For "newer" vendor MADs, also based on OUI
1742 */
1743 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1744 goto out;
1745 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1746 class = port_priv->version[
1747 mad_hdr->class_version].class;
1748 if (!class)
1749 goto out;
1750 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1751 ARRAY_SIZE(class->method_table))
1752 goto out;
1753 method = class->method_table[convert_mgmt_class(
1754 mad_hdr->mgmt_class)];
1755 if (method)
1756 mad_agent = method->agent[mad_hdr->method &
1757 ~IB_MGMT_METHOD_RESP];
1758 } else {
1759 vendor = port_priv->version[
1760 mad_hdr->class_version].vendor;
1761 if (!vendor)
1762 goto out;
1763 vendor_class = vendor->vendor_class[vendor_class_index(
1764 mad_hdr->mgmt_class)];
1765 if (!vendor_class)
1766 goto out;
1767 /* Find matching OUI */
1768 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1769 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1770 if (index == -1)
1771 goto out;
1772 method = vendor_class->method_table[index];
1773 if (method) {
1774 mad_agent = method->agent[mad_hdr->method &
1775 ~IB_MGMT_METHOD_RESP];
1776 }
1777 }
1778 }
1779
1780 if (mad_agent) {
1781 if (mad_agent->agent.recv_handler)
1782 atomic_inc(&mad_agent->refcount);
1783 else {
1784 dev_notice(&port_priv->device->dev,
1785 "No receive handler for client %p on port %d\n",
1786 &mad_agent->agent, port_priv->port_num);
1787 mad_agent = NULL;
1788 }
1789 }
1790 out:
1791 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1792
1793 return mad_agent;
1794 }
1795
validate_mad(const struct ib_mad_hdr * mad_hdr,const struct ib_mad_qp_info * qp_info,bool opa)1796 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1797 const struct ib_mad_qp_info *qp_info,
1798 bool opa)
1799 {
1800 int valid = 0;
1801 u32 qp_num = qp_info->qp->qp_num;
1802
1803 /* Make sure MAD base version is understood */
1804 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1805 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1806 pr_err("MAD received with unsupported base version %d %s\n",
1807 mad_hdr->base_version, opa ? "(opa)" : "");
1808 goto out;
1809 }
1810
1811 /* Filter SMI packets sent to other than QP0 */
1812 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1813 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1814 if (qp_num == 0)
1815 valid = 1;
1816 } else {
1817 /* CM attributes other than ClassPortInfo only use Send method */
1818 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1819 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1820 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1821 goto out;
1822 /* Filter GSI packets sent to QP0 */
1823 if (qp_num != 0)
1824 valid = 1;
1825 }
1826
1827 out:
1828 return valid;
1829 }
1830
is_rmpp_data_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_hdr * mad_hdr)1831 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1832 const struct ib_mad_hdr *mad_hdr)
1833 {
1834 struct ib_rmpp_mad *rmpp_mad;
1835
1836 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1837 return !mad_agent_priv->agent.rmpp_version ||
1838 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1839 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1840 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1841 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1842 }
1843
rcv_has_same_class(const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1844 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1845 const struct ib_mad_recv_wc *rwc)
1846 {
1847 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1848 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1849 }
1850
rcv_has_same_gid(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1851 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1852 const struct ib_mad_send_wr_private *wr,
1853 const struct ib_mad_recv_wc *rwc )
1854 {
1855 struct ib_ah_attr attr;
1856 u8 send_resp, rcv_resp;
1857 union ib_gid sgid;
1858 struct ib_device *device = mad_agent_priv->agent.device;
1859 u8 port_num = mad_agent_priv->agent.port_num;
1860 u8 lmc;
1861
1862 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1863 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1864
1865 if (send_resp == rcv_resp)
1866 /* both requests, or both responses. GIDs different */
1867 return 0;
1868
1869 if (ib_query_ah(wr->send_buf.ah, &attr))
1870 /* Assume not equal, to avoid false positives. */
1871 return 0;
1872
1873 if (!!(attr.ah_flags & IB_AH_GRH) !=
1874 !!(rwc->wc->wc_flags & IB_WC_GRH))
1875 /* one has GID, other does not. Assume different */
1876 return 0;
1877
1878 if (!send_resp && rcv_resp) {
1879 /* is request/response. */
1880 if (!(attr.ah_flags & IB_AH_GRH)) {
1881 if (ib_get_cached_lmc(device, port_num, &lmc))
1882 return 0;
1883 return (!lmc || !((attr.src_path_bits ^
1884 rwc->wc->dlid_path_bits) &
1885 ((1 << lmc) - 1)));
1886 } else {
1887 if (ib_get_cached_gid(device, port_num,
1888 attr.grh.sgid_index, &sgid, NULL))
1889 return 0;
1890 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1891 16);
1892 }
1893 }
1894
1895 if (!(attr.ah_flags & IB_AH_GRH))
1896 return attr.dlid == rwc->wc->slid;
1897 else
1898 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1899 16);
1900 }
1901
is_direct(u8 class)1902 static inline int is_direct(u8 class)
1903 {
1904 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1905 }
1906
1907 struct ib_mad_send_wr_private*
ib_find_send_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_recv_wc * wc)1908 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1909 const struct ib_mad_recv_wc *wc)
1910 {
1911 struct ib_mad_send_wr_private *wr;
1912 const struct ib_mad_hdr *mad_hdr;
1913
1914 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1915
1916 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1917 if ((wr->tid == mad_hdr->tid) &&
1918 rcv_has_same_class(wr, wc) &&
1919 /*
1920 * Don't check GID for direct routed MADs.
1921 * These might have permissive LIDs.
1922 */
1923 (is_direct(mad_hdr->mgmt_class) ||
1924 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1925 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1926 }
1927
1928 /*
1929 * It's possible to receive the response before we've
1930 * been notified that the send has completed
1931 */
1932 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1933 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1934 wr->tid == mad_hdr->tid &&
1935 wr->timeout &&
1936 rcv_has_same_class(wr, wc) &&
1937 /*
1938 * Don't check GID for direct routed MADs.
1939 * These might have permissive LIDs.
1940 */
1941 (is_direct(mad_hdr->mgmt_class) ||
1942 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1943 /* Verify request has not been canceled */
1944 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1945 }
1946 return NULL;
1947 }
1948
ib_mark_mad_done(struct ib_mad_send_wr_private * mad_send_wr)1949 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1950 {
1951 mad_send_wr->timeout = 0;
1952 if (mad_send_wr->refcount == 1)
1953 list_move_tail(&mad_send_wr->agent_list,
1954 &mad_send_wr->mad_agent_priv->done_list);
1955 }
1956
ib_mad_complete_recv(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_recv_wc * mad_recv_wc)1957 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1958 struct ib_mad_recv_wc *mad_recv_wc)
1959 {
1960 struct ib_mad_send_wr_private *mad_send_wr;
1961 struct ib_mad_send_wc mad_send_wc;
1962 unsigned long flags;
1963
1964 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1965 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1966 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1967 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1968 mad_recv_wc);
1969 if (!mad_recv_wc) {
1970 deref_mad_agent(mad_agent_priv);
1971 return;
1972 }
1973 }
1974
1975 /* Complete corresponding request */
1976 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1977 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1978 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1979 if (!mad_send_wr) {
1980 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1981 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1982 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1983 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1984 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1985 /* user rmpp is in effect
1986 * and this is an active RMPP MAD
1987 */
1988 mad_recv_wc->wc->wr_id = 0;
1989 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1990 mad_recv_wc);
1991 atomic_dec(&mad_agent_priv->refcount);
1992 } else {
1993 /* not user rmpp, revert to normal behavior and
1994 * drop the mad */
1995 ib_free_recv_mad(mad_recv_wc);
1996 deref_mad_agent(mad_agent_priv);
1997 return;
1998 }
1999 } else {
2000 ib_mark_mad_done(mad_send_wr);
2001 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2002
2003 /* Defined behavior is to complete response before request */
2004 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
2005 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2006 mad_recv_wc);
2007 atomic_dec(&mad_agent_priv->refcount);
2008
2009 mad_send_wc.status = IB_WC_SUCCESS;
2010 mad_send_wc.vendor_err = 0;
2011 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2012 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2013 }
2014 } else {
2015 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2016 mad_recv_wc);
2017 deref_mad_agent(mad_agent_priv);
2018 }
2019 }
2020
handle_ib_smi(const struct ib_mad_port_private * port_priv,const struct ib_mad_qp_info * qp_info,const struct ib_wc * wc,int port_num,struct ib_mad_private * recv,struct ib_mad_private * response)2021 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2022 const struct ib_mad_qp_info *qp_info,
2023 const struct ib_wc *wc,
2024 int port_num,
2025 struct ib_mad_private *recv,
2026 struct ib_mad_private *response)
2027 {
2028 enum smi_forward_action retsmi;
2029 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2030
2031 if (smi_handle_dr_smp_recv(smp,
2032 rdma_cap_ib_switch(port_priv->device),
2033 port_num,
2034 port_priv->device->phys_port_cnt) ==
2035 IB_SMI_DISCARD)
2036 return IB_SMI_DISCARD;
2037
2038 retsmi = smi_check_forward_dr_smp(smp);
2039 if (retsmi == IB_SMI_LOCAL)
2040 return IB_SMI_HANDLE;
2041
2042 if (retsmi == IB_SMI_SEND) { /* don't forward */
2043 if (smi_handle_dr_smp_send(smp,
2044 rdma_cap_ib_switch(port_priv->device),
2045 port_num) == IB_SMI_DISCARD)
2046 return IB_SMI_DISCARD;
2047
2048 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2049 return IB_SMI_DISCARD;
2050 } else if (rdma_cap_ib_switch(port_priv->device)) {
2051 /* forward case for switches */
2052 memcpy(response, recv, mad_priv_size(response));
2053 response->header.recv_wc.wc = &response->header.wc;
2054 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2055 response->header.recv_wc.recv_buf.grh = &response->grh;
2056
2057 agent_send_response((const struct ib_mad_hdr *)response->mad,
2058 &response->grh, wc,
2059 port_priv->device,
2060 smi_get_fwd_port(smp),
2061 qp_info->qp->qp_num,
2062 response->mad_size,
2063 false);
2064
2065 return IB_SMI_DISCARD;
2066 }
2067 return IB_SMI_HANDLE;
2068 }
2069
generate_unmatched_resp(const struct ib_mad_private * recv,struct ib_mad_private * response,size_t * resp_len,bool opa)2070 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2071 struct ib_mad_private *response,
2072 size_t *resp_len, bool opa)
2073 {
2074 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2075 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2076
2077 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2078 recv_hdr->method == IB_MGMT_METHOD_SET) {
2079 memcpy(response, recv, mad_priv_size(response));
2080 response->header.recv_wc.wc = &response->header.wc;
2081 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2082 response->header.recv_wc.recv_buf.grh = &response->grh;
2083 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2084 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2085 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2086 resp_hdr->status |= IB_SMP_DIRECTION;
2087
2088 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2089 if (recv_hdr->mgmt_class ==
2090 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2091 recv_hdr->mgmt_class ==
2092 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2093 *resp_len = opa_get_smp_header_size(
2094 (struct opa_smp *)recv->mad);
2095 else
2096 *resp_len = sizeof(struct ib_mad_hdr);
2097 }
2098
2099 return true;
2100 } else {
2101 return false;
2102 }
2103 }
2104
2105 static enum smi_action
handle_opa_smi(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info,struct ib_wc * wc,int port_num,struct ib_mad_private * recv,struct ib_mad_private * response)2106 handle_opa_smi(struct ib_mad_port_private *port_priv,
2107 struct ib_mad_qp_info *qp_info,
2108 struct ib_wc *wc,
2109 int port_num,
2110 struct ib_mad_private *recv,
2111 struct ib_mad_private *response)
2112 {
2113 enum smi_forward_action retsmi;
2114 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2115
2116 if (opa_smi_handle_dr_smp_recv(smp,
2117 rdma_cap_ib_switch(port_priv->device),
2118 port_num,
2119 port_priv->device->phys_port_cnt) ==
2120 IB_SMI_DISCARD)
2121 return IB_SMI_DISCARD;
2122
2123 retsmi = opa_smi_check_forward_dr_smp(smp);
2124 if (retsmi == IB_SMI_LOCAL)
2125 return IB_SMI_HANDLE;
2126
2127 if (retsmi == IB_SMI_SEND) { /* don't forward */
2128 if (opa_smi_handle_dr_smp_send(smp,
2129 rdma_cap_ib_switch(port_priv->device),
2130 port_num) == IB_SMI_DISCARD)
2131 return IB_SMI_DISCARD;
2132
2133 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2134 IB_SMI_DISCARD)
2135 return IB_SMI_DISCARD;
2136
2137 } else if (rdma_cap_ib_switch(port_priv->device)) {
2138 /* forward case for switches */
2139 memcpy(response, recv, mad_priv_size(response));
2140 response->header.recv_wc.wc = &response->header.wc;
2141 response->header.recv_wc.recv_buf.opa_mad =
2142 (struct opa_mad *)response->mad;
2143 response->header.recv_wc.recv_buf.grh = &response->grh;
2144
2145 agent_send_response((const struct ib_mad_hdr *)response->mad,
2146 &response->grh, wc,
2147 port_priv->device,
2148 opa_smi_get_fwd_port(smp),
2149 qp_info->qp->qp_num,
2150 recv->header.wc.byte_len,
2151 true);
2152
2153 return IB_SMI_DISCARD;
2154 }
2155
2156 return IB_SMI_HANDLE;
2157 }
2158
2159 static enum smi_action
handle_smi(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info,struct ib_wc * wc,int port_num,struct ib_mad_private * recv,struct ib_mad_private * response,bool opa)2160 handle_smi(struct ib_mad_port_private *port_priv,
2161 struct ib_mad_qp_info *qp_info,
2162 struct ib_wc *wc,
2163 int port_num,
2164 struct ib_mad_private *recv,
2165 struct ib_mad_private *response,
2166 bool opa)
2167 {
2168 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2169
2170 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2171 mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
2172 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2173 response);
2174
2175 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2176 }
2177
ib_mad_recv_done_handler(struct ib_mad_port_private * port_priv,struct ib_wc * wc)2178 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
2179 struct ib_wc *wc)
2180 {
2181 struct ib_mad_qp_info *qp_info;
2182 struct ib_mad_private_header *mad_priv_hdr;
2183 struct ib_mad_private *recv, *response = NULL;
2184 struct ib_mad_list_head *mad_list;
2185 struct ib_mad_agent_private *mad_agent;
2186 int port_num;
2187 int ret = IB_MAD_RESULT_SUCCESS;
2188 size_t mad_size;
2189 u16 resp_mad_pkey_index = 0;
2190 bool opa;
2191
2192 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2193 qp_info = mad_list->mad_queue->qp_info;
2194 dequeue_mad(mad_list);
2195
2196 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2197 qp_info->port_priv->port_num);
2198
2199 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2200 mad_list);
2201 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2202 ib_dma_unmap_single(port_priv->device,
2203 recv->header.mapping,
2204 mad_priv_dma_size(recv),
2205 DMA_FROM_DEVICE);
2206
2207 /* Setup MAD receive work completion from "normal" work completion */
2208 recv->header.wc = *wc;
2209 recv->header.recv_wc.wc = &recv->header.wc;
2210
2211 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2212 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2213 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2214 } else {
2215 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2216 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2217 }
2218
2219 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2220 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2221
2222 if (atomic_read(&qp_info->snoop_count))
2223 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2224
2225 /* Validate MAD */
2226 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2227 goto out;
2228
2229 mad_size = recv->mad_size;
2230 response = alloc_mad_private(mad_size, GFP_KERNEL);
2231 if (!response) {
2232 dev_err(&port_priv->device->dev,
2233 "ib_mad_recv_done_handler no memory for response buffer\n");
2234 goto out;
2235 }
2236
2237 if (rdma_cap_ib_switch(port_priv->device))
2238 port_num = wc->port_num;
2239 else
2240 port_num = port_priv->port_num;
2241
2242 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2243 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2244 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2245 response, opa)
2246 == IB_SMI_DISCARD)
2247 goto out;
2248 }
2249
2250 /* Give driver "right of first refusal" on incoming MAD */
2251 if (port_priv->device->process_mad) {
2252 ret = port_priv->device->process_mad(port_priv->device, 0,
2253 port_priv->port_num,
2254 wc, &recv->grh,
2255 (const struct ib_mad_hdr *)recv->mad,
2256 recv->mad_size,
2257 (struct ib_mad_hdr *)response->mad,
2258 &mad_size, &resp_mad_pkey_index);
2259
2260 if (opa)
2261 wc->pkey_index = resp_mad_pkey_index;
2262
2263 if (ret & IB_MAD_RESULT_SUCCESS) {
2264 if (ret & IB_MAD_RESULT_CONSUMED)
2265 goto out;
2266 if (ret & IB_MAD_RESULT_REPLY) {
2267 agent_send_response((const struct ib_mad_hdr *)response->mad,
2268 &recv->grh, wc,
2269 port_priv->device,
2270 port_num,
2271 qp_info->qp->qp_num,
2272 mad_size, opa);
2273 goto out;
2274 }
2275 }
2276 }
2277
2278 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2279 if (mad_agent) {
2280 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2281 /*
2282 * recv is freed up in error cases in ib_mad_complete_recv
2283 * or via recv_handler in ib_mad_complete_recv()
2284 */
2285 recv = NULL;
2286 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2287 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2288 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2289 port_priv->device, port_num,
2290 qp_info->qp->qp_num, mad_size, opa);
2291 }
2292
2293 out:
2294 /* Post another receive request for this QP */
2295 if (response) {
2296 ib_mad_post_receive_mads(qp_info, response);
2297 kfree(recv);
2298 } else
2299 ib_mad_post_receive_mads(qp_info, recv);
2300 }
2301
adjust_timeout(struct ib_mad_agent_private * mad_agent_priv)2302 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2303 {
2304 struct ib_mad_send_wr_private *mad_send_wr;
2305 unsigned long delay;
2306
2307 if (list_empty(&mad_agent_priv->wait_list)) {
2308 cancel_delayed_work(&mad_agent_priv->timed_work);
2309 } else {
2310 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2311 struct ib_mad_send_wr_private,
2312 agent_list);
2313
2314 if (time_after(mad_agent_priv->timeout,
2315 mad_send_wr->timeout)) {
2316 mad_agent_priv->timeout = mad_send_wr->timeout;
2317 delay = mad_send_wr->timeout - jiffies;
2318 if ((long)delay <= 0)
2319 delay = 1;
2320 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2321 &mad_agent_priv->timed_work, delay);
2322 }
2323 }
2324 }
2325
wait_for_response(struct ib_mad_send_wr_private * mad_send_wr)2326 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2327 {
2328 struct ib_mad_agent_private *mad_agent_priv;
2329 struct ib_mad_send_wr_private *temp_mad_send_wr;
2330 struct list_head *list_item;
2331 unsigned long delay;
2332
2333 mad_agent_priv = mad_send_wr->mad_agent_priv;
2334 list_del(&mad_send_wr->agent_list);
2335
2336 delay = mad_send_wr->timeout;
2337 mad_send_wr->timeout += jiffies;
2338
2339 if (delay) {
2340 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2341 temp_mad_send_wr = list_entry(list_item,
2342 struct ib_mad_send_wr_private,
2343 agent_list);
2344 if (time_after(mad_send_wr->timeout,
2345 temp_mad_send_wr->timeout))
2346 break;
2347 }
2348 }
2349 else
2350 list_item = &mad_agent_priv->wait_list;
2351 list_add(&mad_send_wr->agent_list, list_item);
2352
2353 /* Reschedule a work item if we have a shorter timeout */
2354 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2355 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2356 &mad_agent_priv->timed_work, delay);
2357 }
2358
ib_reset_mad_timeout(struct ib_mad_send_wr_private * mad_send_wr,int timeout_ms)2359 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2360 int timeout_ms)
2361 {
2362 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2363 wait_for_response(mad_send_wr);
2364 }
2365
2366 /*
2367 * Process a send work completion
2368 */
ib_mad_complete_send_wr(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)2369 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2370 struct ib_mad_send_wc *mad_send_wc)
2371 {
2372 struct ib_mad_agent_private *mad_agent_priv;
2373 unsigned long flags;
2374 int ret;
2375
2376 mad_agent_priv = mad_send_wr->mad_agent_priv;
2377 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2378 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2379 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2380 if (ret == IB_RMPP_RESULT_CONSUMED)
2381 goto done;
2382 } else
2383 ret = IB_RMPP_RESULT_UNHANDLED;
2384
2385 if (mad_send_wc->status != IB_WC_SUCCESS &&
2386 mad_send_wr->status == IB_WC_SUCCESS) {
2387 mad_send_wr->status = mad_send_wc->status;
2388 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2389 }
2390
2391 if (--mad_send_wr->refcount > 0) {
2392 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2393 mad_send_wr->status == IB_WC_SUCCESS) {
2394 wait_for_response(mad_send_wr);
2395 }
2396 goto done;
2397 }
2398
2399 /* Remove send from MAD agent and notify client of completion */
2400 list_del(&mad_send_wr->agent_list);
2401 adjust_timeout(mad_agent_priv);
2402 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2403
2404 if (mad_send_wr->status != IB_WC_SUCCESS )
2405 mad_send_wc->status = mad_send_wr->status;
2406 if (ret == IB_RMPP_RESULT_INTERNAL)
2407 ib_rmpp_send_handler(mad_send_wc);
2408 else
2409 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2410 mad_send_wc);
2411
2412 /* Release reference on agent taken when sending */
2413 deref_mad_agent(mad_agent_priv);
2414 return;
2415 done:
2416 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2417 }
2418
ib_mad_send_done_handler(struct ib_mad_port_private * port_priv,struct ib_wc * wc)2419 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2420 struct ib_wc *wc)
2421 {
2422 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2423 struct ib_mad_list_head *mad_list;
2424 struct ib_mad_qp_info *qp_info;
2425 struct ib_mad_queue *send_queue;
2426 struct ib_send_wr *bad_send_wr;
2427 struct ib_mad_send_wc mad_send_wc;
2428 unsigned long flags;
2429 int ret;
2430
2431 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2432 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2433 mad_list);
2434 send_queue = mad_list->mad_queue;
2435 qp_info = send_queue->qp_info;
2436
2437 retry:
2438 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2439 mad_send_wr->header_mapping,
2440 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2441 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2442 mad_send_wr->payload_mapping,
2443 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2444 queued_send_wr = NULL;
2445 spin_lock_irqsave(&send_queue->lock, flags);
2446 list_del(&mad_list->list);
2447
2448 /* Move queued send to the send queue */
2449 if (send_queue->count-- > send_queue->max_active) {
2450 mad_list = container_of(qp_info->overflow_list.next,
2451 struct ib_mad_list_head, list);
2452 queued_send_wr = container_of(mad_list,
2453 struct ib_mad_send_wr_private,
2454 mad_list);
2455 list_move_tail(&mad_list->list, &send_queue->list);
2456 }
2457 spin_unlock_irqrestore(&send_queue->lock, flags);
2458
2459 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2460 mad_send_wc.status = wc->status;
2461 mad_send_wc.vendor_err = wc->vendor_err;
2462 if (atomic_read(&qp_info->snoop_count))
2463 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2464 IB_MAD_SNOOP_SEND_COMPLETIONS);
2465 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2466
2467 if (queued_send_wr) {
2468 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2469 &bad_send_wr);
2470 if (ret) {
2471 dev_err(&port_priv->device->dev,
2472 "ib_post_send failed: %d\n", ret);
2473 mad_send_wr = queued_send_wr;
2474 wc->status = IB_WC_LOC_QP_OP_ERR;
2475 goto retry;
2476 }
2477 }
2478 }
2479
mark_sends_for_retry(struct ib_mad_qp_info * qp_info)2480 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2481 {
2482 struct ib_mad_send_wr_private *mad_send_wr;
2483 struct ib_mad_list_head *mad_list;
2484 unsigned long flags;
2485
2486 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2487 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2488 mad_send_wr = container_of(mad_list,
2489 struct ib_mad_send_wr_private,
2490 mad_list);
2491 mad_send_wr->retry = 1;
2492 }
2493 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2494 }
2495
mad_error_handler(struct ib_mad_port_private * port_priv,struct ib_wc * wc)2496 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2497 struct ib_wc *wc)
2498 {
2499 struct ib_mad_list_head *mad_list;
2500 struct ib_mad_qp_info *qp_info;
2501 struct ib_mad_send_wr_private *mad_send_wr;
2502 int ret;
2503
2504 /* Determine if failure was a send or receive */
2505 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2506 qp_info = mad_list->mad_queue->qp_info;
2507 if (mad_list->mad_queue == &qp_info->recv_queue)
2508 /*
2509 * Receive errors indicate that the QP has entered the error
2510 * state - error handling/shutdown code will cleanup
2511 */
2512 return;
2513
2514 /*
2515 * Send errors will transition the QP to SQE - move
2516 * QP to RTS and repost flushed work requests
2517 */
2518 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2519 mad_list);
2520 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2521 if (mad_send_wr->retry) {
2522 /* Repost send */
2523 struct ib_send_wr *bad_send_wr;
2524
2525 mad_send_wr->retry = 0;
2526 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2527 &bad_send_wr);
2528 if (ret)
2529 ib_mad_send_done_handler(port_priv, wc);
2530 } else
2531 ib_mad_send_done_handler(port_priv, wc);
2532 } else {
2533 struct ib_qp_attr *attr;
2534
2535 /* Transition QP to RTS and fail offending send */
2536 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2537 if (attr) {
2538 attr->qp_state = IB_QPS_RTS;
2539 attr->cur_qp_state = IB_QPS_SQE;
2540 ret = ib_modify_qp(qp_info->qp, attr,
2541 IB_QP_STATE | IB_QP_CUR_STATE);
2542 kfree(attr);
2543 if (ret)
2544 dev_err(&port_priv->device->dev,
2545 "mad_error_handler - ib_modify_qp to RTS : %d\n",
2546 ret);
2547 else
2548 mark_sends_for_retry(qp_info);
2549 }
2550 ib_mad_send_done_handler(port_priv, wc);
2551 }
2552 }
2553
2554 /*
2555 * IB MAD completion callback
2556 */
ib_mad_completion_handler(struct work_struct * work)2557 static void ib_mad_completion_handler(struct work_struct *work)
2558 {
2559 struct ib_mad_port_private *port_priv;
2560 struct ib_wc wc;
2561
2562 port_priv = container_of(work, struct ib_mad_port_private, work);
2563 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2564
2565 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2566 if (wc.status == IB_WC_SUCCESS) {
2567 switch (wc.opcode) {
2568 case IB_WC_SEND:
2569 ib_mad_send_done_handler(port_priv, &wc);
2570 break;
2571 case IB_WC_RECV:
2572 ib_mad_recv_done_handler(port_priv, &wc);
2573 break;
2574 default:
2575 BUG_ON(1);
2576 break;
2577 }
2578 } else
2579 mad_error_handler(port_priv, &wc);
2580 }
2581 }
2582
cancel_mads(struct ib_mad_agent_private * mad_agent_priv)2583 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2584 {
2585 unsigned long flags;
2586 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2587 struct ib_mad_send_wc mad_send_wc;
2588 struct list_head cancel_list;
2589
2590 INIT_LIST_HEAD(&cancel_list);
2591
2592 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2593 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2594 &mad_agent_priv->send_list, agent_list) {
2595 if (mad_send_wr->status == IB_WC_SUCCESS) {
2596 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2597 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2598 }
2599 }
2600
2601 /* Empty wait list to prevent receives from finding a request */
2602 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2603 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2604
2605 /* Report all cancelled requests */
2606 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2607 mad_send_wc.vendor_err = 0;
2608
2609 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2610 &cancel_list, agent_list) {
2611 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2612 list_del(&mad_send_wr->agent_list);
2613 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2614 &mad_send_wc);
2615 atomic_dec(&mad_agent_priv->refcount);
2616 }
2617 }
2618
2619 static struct ib_mad_send_wr_private*
find_send_wr(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_buf * send_buf)2620 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2621 struct ib_mad_send_buf *send_buf)
2622 {
2623 struct ib_mad_send_wr_private *mad_send_wr;
2624
2625 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2626 agent_list) {
2627 if (&mad_send_wr->send_buf == send_buf)
2628 return mad_send_wr;
2629 }
2630
2631 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2632 agent_list) {
2633 if (is_rmpp_data_mad(mad_agent_priv,
2634 mad_send_wr->send_buf.mad) &&
2635 &mad_send_wr->send_buf == send_buf)
2636 return mad_send_wr;
2637 }
2638 return NULL;
2639 }
2640
ib_modify_mad(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf,u32 timeout_ms)2641 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2642 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2643 {
2644 struct ib_mad_agent_private *mad_agent_priv;
2645 struct ib_mad_send_wr_private *mad_send_wr;
2646 unsigned long flags;
2647 int active;
2648
2649 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2650 agent);
2651 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2652 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2653 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2654 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2655 return -EINVAL;
2656 }
2657
2658 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2659 if (!timeout_ms) {
2660 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2661 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2662 }
2663
2664 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2665 if (active)
2666 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2667 else
2668 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2669
2670 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2671 return 0;
2672 }
2673 EXPORT_SYMBOL(ib_modify_mad);
2674
ib_cancel_mad(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf)2675 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2676 struct ib_mad_send_buf *send_buf)
2677 {
2678 ib_modify_mad(mad_agent, send_buf, 0);
2679 }
2680 EXPORT_SYMBOL(ib_cancel_mad);
2681
local_completions(struct work_struct * work)2682 static void local_completions(struct work_struct *work)
2683 {
2684 struct ib_mad_agent_private *mad_agent_priv;
2685 struct ib_mad_local_private *local;
2686 struct ib_mad_agent_private *recv_mad_agent;
2687 unsigned long flags;
2688 int free_mad;
2689 struct ib_wc wc;
2690 struct ib_mad_send_wc mad_send_wc;
2691 bool opa;
2692
2693 mad_agent_priv =
2694 container_of(work, struct ib_mad_agent_private, local_work);
2695
2696 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2697 mad_agent_priv->qp_info->port_priv->port_num);
2698
2699 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2700 while (!list_empty(&mad_agent_priv->local_list)) {
2701 local = list_entry(mad_agent_priv->local_list.next,
2702 struct ib_mad_local_private,
2703 completion_list);
2704 list_del(&local->completion_list);
2705 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2706 free_mad = 0;
2707 if (local->mad_priv) {
2708 u8 base_version;
2709 recv_mad_agent = local->recv_mad_agent;
2710 if (!recv_mad_agent) {
2711 dev_err(&mad_agent_priv->agent.device->dev,
2712 "No receive MAD agent for local completion\n");
2713 free_mad = 1;
2714 goto local_send_completion;
2715 }
2716
2717 /*
2718 * Defined behavior is to complete response
2719 * before request
2720 */
2721 build_smp_wc(recv_mad_agent->agent.qp,
2722 (unsigned long) local->mad_send_wr,
2723 be16_to_cpu(IB_LID_PERMISSIVE),
2724 local->mad_send_wr->send_wr.pkey_index,
2725 recv_mad_agent->agent.port_num, &wc);
2726
2727 local->mad_priv->header.recv_wc.wc = &wc;
2728
2729 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2730 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2731 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2732 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2733 } else {
2734 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2735 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2736 }
2737
2738 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2739 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2740 &local->mad_priv->header.recv_wc.rmpp_list);
2741 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2742 local->mad_priv->header.recv_wc.recv_buf.mad =
2743 (struct ib_mad *)local->mad_priv->mad;
2744 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2745 snoop_recv(recv_mad_agent->qp_info,
2746 &local->mad_priv->header.recv_wc,
2747 IB_MAD_SNOOP_RECVS);
2748 recv_mad_agent->agent.recv_handler(
2749 &recv_mad_agent->agent,
2750 &local->mad_priv->header.recv_wc);
2751 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2752 atomic_dec(&recv_mad_agent->refcount);
2753 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2754 }
2755
2756 local_send_completion:
2757 /* Complete send */
2758 mad_send_wc.status = IB_WC_SUCCESS;
2759 mad_send_wc.vendor_err = 0;
2760 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2761 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2762 snoop_send(mad_agent_priv->qp_info,
2763 &local->mad_send_wr->send_buf,
2764 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2765 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2766 &mad_send_wc);
2767
2768 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2769 atomic_dec(&mad_agent_priv->refcount);
2770 if (free_mad)
2771 kfree(local->mad_priv);
2772 kfree(local);
2773 }
2774 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2775 }
2776
retry_send(struct ib_mad_send_wr_private * mad_send_wr)2777 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2778 {
2779 int ret;
2780
2781 if (!mad_send_wr->retries_left)
2782 return -ETIMEDOUT;
2783
2784 mad_send_wr->retries_left--;
2785 mad_send_wr->send_buf.retries++;
2786
2787 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2788
2789 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2790 ret = ib_retry_rmpp(mad_send_wr);
2791 switch (ret) {
2792 case IB_RMPP_RESULT_UNHANDLED:
2793 ret = ib_send_mad(mad_send_wr);
2794 break;
2795 case IB_RMPP_RESULT_CONSUMED:
2796 ret = 0;
2797 break;
2798 default:
2799 ret = -ECOMM;
2800 break;
2801 }
2802 } else
2803 ret = ib_send_mad(mad_send_wr);
2804
2805 if (!ret) {
2806 mad_send_wr->refcount++;
2807 list_add_tail(&mad_send_wr->agent_list,
2808 &mad_send_wr->mad_agent_priv->send_list);
2809 }
2810 return ret;
2811 }
2812
timeout_sends(struct work_struct * work)2813 static void timeout_sends(struct work_struct *work)
2814 {
2815 struct ib_mad_agent_private *mad_agent_priv;
2816 struct ib_mad_send_wr_private *mad_send_wr;
2817 struct ib_mad_send_wc mad_send_wc;
2818 unsigned long flags, delay;
2819
2820 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2821 timed_work.work);
2822 mad_send_wc.vendor_err = 0;
2823
2824 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2825 while (!list_empty(&mad_agent_priv->wait_list)) {
2826 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2827 struct ib_mad_send_wr_private,
2828 agent_list);
2829
2830 if (time_after(mad_send_wr->timeout, jiffies)) {
2831 delay = mad_send_wr->timeout - jiffies;
2832 if ((long)delay <= 0)
2833 delay = 1;
2834 queue_delayed_work(mad_agent_priv->qp_info->
2835 port_priv->wq,
2836 &mad_agent_priv->timed_work, delay);
2837 break;
2838 }
2839
2840 list_del(&mad_send_wr->agent_list);
2841 if (mad_send_wr->status == IB_WC_SUCCESS &&
2842 !retry_send(mad_send_wr))
2843 continue;
2844
2845 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2846
2847 if (mad_send_wr->status == IB_WC_SUCCESS)
2848 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2849 else
2850 mad_send_wc.status = mad_send_wr->status;
2851 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2852 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2853 &mad_send_wc);
2854
2855 atomic_dec(&mad_agent_priv->refcount);
2856 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2857 }
2858 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2859 }
2860
ib_mad_thread_completion_handler(struct ib_cq * cq,void * arg)2861 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2862 {
2863 struct ib_mad_port_private *port_priv = cq->cq_context;
2864 unsigned long flags;
2865
2866 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2867 if (!list_empty(&port_priv->port_list))
2868 queue_work(port_priv->wq, &port_priv->work);
2869 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2870 }
2871
2872 /*
2873 * Allocate receive MADs and post receive WRs for them
2874 */
ib_mad_post_receive_mads(struct ib_mad_qp_info * qp_info,struct ib_mad_private * mad)2875 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2876 struct ib_mad_private *mad)
2877 {
2878 unsigned long flags;
2879 int post, ret;
2880 struct ib_mad_private *mad_priv;
2881 struct ib_sge sg_list;
2882 struct ib_recv_wr recv_wr, *bad_recv_wr;
2883 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2884
2885 /* Initialize common scatter list fields */
2886 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2887
2888 /* Initialize common receive WR fields */
2889 recv_wr.next = NULL;
2890 recv_wr.sg_list = &sg_list;
2891 recv_wr.num_sge = 1;
2892
2893 do {
2894 /* Allocate and map receive buffer */
2895 if (mad) {
2896 mad_priv = mad;
2897 mad = NULL;
2898 } else {
2899 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2900 GFP_ATOMIC);
2901 if (!mad_priv) {
2902 dev_err(&qp_info->port_priv->device->dev,
2903 "No memory for receive buffer\n");
2904 ret = -ENOMEM;
2905 break;
2906 }
2907 }
2908 sg_list.length = mad_priv_dma_size(mad_priv);
2909 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2910 &mad_priv->grh,
2911 mad_priv_dma_size(mad_priv),
2912 DMA_FROM_DEVICE);
2913 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2914 sg_list.addr))) {
2915 kfree(mad_priv);
2916 ret = -ENOMEM;
2917 break;
2918 }
2919 mad_priv->header.mapping = sg_list.addr;
2920 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2921 mad_priv->header.mad_list.mad_queue = recv_queue;
2922
2923 /* Post receive WR */
2924 spin_lock_irqsave(&recv_queue->lock, flags);
2925 post = (++recv_queue->count < recv_queue->max_active);
2926 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2927 spin_unlock_irqrestore(&recv_queue->lock, flags);
2928 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2929 if (ret) {
2930 spin_lock_irqsave(&recv_queue->lock, flags);
2931 list_del(&mad_priv->header.mad_list.list);
2932 recv_queue->count--;
2933 spin_unlock_irqrestore(&recv_queue->lock, flags);
2934 ib_dma_unmap_single(qp_info->port_priv->device,
2935 mad_priv->header.mapping,
2936 mad_priv_dma_size(mad_priv),
2937 DMA_FROM_DEVICE);
2938 kfree(mad_priv);
2939 dev_err(&qp_info->port_priv->device->dev,
2940 "ib_post_recv failed: %d\n", ret);
2941 break;
2942 }
2943 } while (post);
2944
2945 return ret;
2946 }
2947
2948 /*
2949 * Return all the posted receive MADs
2950 */
cleanup_recv_queue(struct ib_mad_qp_info * qp_info)2951 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2952 {
2953 struct ib_mad_private_header *mad_priv_hdr;
2954 struct ib_mad_private *recv;
2955 struct ib_mad_list_head *mad_list;
2956
2957 if (!qp_info->qp)
2958 return;
2959
2960 while (!list_empty(&qp_info->recv_queue.list)) {
2961
2962 mad_list = list_entry(qp_info->recv_queue.list.next,
2963 struct ib_mad_list_head, list);
2964 mad_priv_hdr = container_of(mad_list,
2965 struct ib_mad_private_header,
2966 mad_list);
2967 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2968 header);
2969
2970 /* Remove from posted receive MAD list */
2971 list_del(&mad_list->list);
2972
2973 ib_dma_unmap_single(qp_info->port_priv->device,
2974 recv->header.mapping,
2975 mad_priv_dma_size(recv),
2976 DMA_FROM_DEVICE);
2977 kfree(recv);
2978 }
2979
2980 qp_info->recv_queue.count = 0;
2981 }
2982
2983 /*
2984 * Start the port
2985 */
ib_mad_port_start(struct ib_mad_port_private * port_priv)2986 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2987 {
2988 int ret, i;
2989 struct ib_qp_attr *attr;
2990 struct ib_qp *qp;
2991 u16 pkey_index;
2992
2993 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2994 if (!attr) {
2995 dev_err(&port_priv->device->dev,
2996 "Couldn't kmalloc ib_qp_attr\n");
2997 return -ENOMEM;
2998 }
2999
3000 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
3001 IB_DEFAULT_PKEY_FULL, &pkey_index);
3002 if (ret)
3003 pkey_index = 0;
3004
3005 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3006 qp = port_priv->qp_info[i].qp;
3007 if (!qp)
3008 continue;
3009
3010 /*
3011 * PKey index for QP1 is irrelevant but
3012 * one is needed for the Reset to Init transition
3013 */
3014 attr->qp_state = IB_QPS_INIT;
3015 attr->pkey_index = pkey_index;
3016 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3017 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3018 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3019 if (ret) {
3020 dev_err(&port_priv->device->dev,
3021 "Couldn't change QP%d state to INIT: %d\n",
3022 i, ret);
3023 goto out;
3024 }
3025
3026 attr->qp_state = IB_QPS_RTR;
3027 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3028 if (ret) {
3029 dev_err(&port_priv->device->dev,
3030 "Couldn't change QP%d state to RTR: %d\n",
3031 i, ret);
3032 goto out;
3033 }
3034
3035 attr->qp_state = IB_QPS_RTS;
3036 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3037 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3038 if (ret) {
3039 dev_err(&port_priv->device->dev,
3040 "Couldn't change QP%d state to RTS: %d\n",
3041 i, ret);
3042 goto out;
3043 }
3044 }
3045
3046 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3047 if (ret) {
3048 dev_err(&port_priv->device->dev,
3049 "Failed to request completion notification: %d\n",
3050 ret);
3051 goto out;
3052 }
3053
3054 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3055 if (!port_priv->qp_info[i].qp)
3056 continue;
3057
3058 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3059 if (ret) {
3060 dev_err(&port_priv->device->dev,
3061 "Couldn't post receive WRs\n");
3062 goto out;
3063 }
3064 }
3065 out:
3066 kfree(attr);
3067 return ret;
3068 }
3069
qp_event_handler(struct ib_event * event,void * qp_context)3070 static void qp_event_handler(struct ib_event *event, void *qp_context)
3071 {
3072 struct ib_mad_qp_info *qp_info = qp_context;
3073
3074 /* It's worse than that! He's dead, Jim! */
3075 dev_err(&qp_info->port_priv->device->dev,
3076 "Fatal error (%d) on MAD QP (%d)\n",
3077 event->event, qp_info->qp->qp_num);
3078 }
3079
init_mad_queue(struct ib_mad_qp_info * qp_info,struct ib_mad_queue * mad_queue)3080 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3081 struct ib_mad_queue *mad_queue)
3082 {
3083 mad_queue->qp_info = qp_info;
3084 mad_queue->count = 0;
3085 spin_lock_init(&mad_queue->lock);
3086 INIT_LIST_HEAD(&mad_queue->list);
3087 }
3088
init_mad_qp(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info)3089 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3090 struct ib_mad_qp_info *qp_info)
3091 {
3092 qp_info->port_priv = port_priv;
3093 init_mad_queue(qp_info, &qp_info->send_queue);
3094 init_mad_queue(qp_info, &qp_info->recv_queue);
3095 INIT_LIST_HEAD(&qp_info->overflow_list);
3096 spin_lock_init(&qp_info->snoop_lock);
3097 qp_info->snoop_table = NULL;
3098 qp_info->snoop_table_size = 0;
3099 atomic_set(&qp_info->snoop_count, 0);
3100 }
3101
create_mad_qp(struct ib_mad_qp_info * qp_info,enum ib_qp_type qp_type)3102 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3103 enum ib_qp_type qp_type)
3104 {
3105 struct ib_qp_init_attr qp_init_attr;
3106 int ret;
3107
3108 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3109 qp_init_attr.send_cq = qp_info->port_priv->cq;
3110 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3111 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3112 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3113 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3114 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3115 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3116 qp_init_attr.qp_type = qp_type;
3117 qp_init_attr.port_num = qp_info->port_priv->port_num;
3118 qp_init_attr.qp_context = qp_info;
3119 qp_init_attr.event_handler = qp_event_handler;
3120 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3121 if (IS_ERR(qp_info->qp)) {
3122 dev_err(&qp_info->port_priv->device->dev,
3123 "Couldn't create ib_mad QP%d\n",
3124 get_spl_qp_index(qp_type));
3125 ret = PTR_ERR(qp_info->qp);
3126 goto error;
3127 }
3128 /* Use minimum queue sizes unless the CQ is resized */
3129 qp_info->send_queue.max_active = mad_sendq_size;
3130 qp_info->recv_queue.max_active = mad_recvq_size;
3131 return 0;
3132
3133 error:
3134 return ret;
3135 }
3136
destroy_mad_qp(struct ib_mad_qp_info * qp_info)3137 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3138 {
3139 if (!qp_info->qp)
3140 return;
3141
3142 ib_destroy_qp(qp_info->qp);
3143 kfree(qp_info->snoop_table);
3144 }
3145
3146 /*
3147 * Open the port
3148 * Create the QP, PD, MR, and CQ if needed
3149 */
ib_mad_port_open(struct ib_device * device,int port_num)3150 static int ib_mad_port_open(struct ib_device *device,
3151 int port_num)
3152 {
3153 int ret, cq_size;
3154 struct ib_mad_port_private *port_priv;
3155 unsigned long flags;
3156 char name[sizeof "ib_mad123"];
3157 int has_smi;
3158 struct ib_cq_init_attr cq_attr = {};
3159
3160 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3161 return -EFAULT;
3162
3163 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3164 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3165 return -EFAULT;
3166
3167 /* Create new device info */
3168 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3169 if (!port_priv) {
3170 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
3171 return -ENOMEM;
3172 }
3173
3174 port_priv->device = device;
3175 port_priv->port_num = port_num;
3176 spin_lock_init(&port_priv->reg_lock);
3177 INIT_LIST_HEAD(&port_priv->agent_list);
3178 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3179 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3180
3181 cq_size = mad_sendq_size + mad_recvq_size;
3182 has_smi = rdma_cap_ib_smi(device, port_num);
3183 if (has_smi)
3184 cq_size *= 2;
3185
3186 cq_attr.cqe = cq_size;
3187 port_priv->cq = ib_create_cq(port_priv->device,
3188 ib_mad_thread_completion_handler,
3189 NULL, port_priv, &cq_attr);
3190 if (IS_ERR(port_priv->cq)) {
3191 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3192 ret = PTR_ERR(port_priv->cq);
3193 goto error3;
3194 }
3195
3196 port_priv->pd = ib_alloc_pd(device);
3197 if (IS_ERR(port_priv->pd)) {
3198 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3199 ret = PTR_ERR(port_priv->pd);
3200 goto error4;
3201 }
3202
3203 if (has_smi) {
3204 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3205 if (ret)
3206 goto error6;
3207 }
3208 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3209 if (ret)
3210 goto error7;
3211
3212 snprintf(name, sizeof name, "ib_mad%d", port_num);
3213 port_priv->wq = create_singlethread_workqueue(name);
3214 if (!port_priv->wq) {
3215 ret = -ENOMEM;
3216 goto error8;
3217 }
3218 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
3219
3220 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3221 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3222 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3223
3224 ret = ib_mad_port_start(port_priv);
3225 if (ret) {
3226 dev_err(&device->dev, "Couldn't start port\n");
3227 goto error9;
3228 }
3229
3230 return 0;
3231
3232 error9:
3233 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3234 list_del_init(&port_priv->port_list);
3235 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3236
3237 destroy_workqueue(port_priv->wq);
3238 error8:
3239 destroy_mad_qp(&port_priv->qp_info[1]);
3240 error7:
3241 destroy_mad_qp(&port_priv->qp_info[0]);
3242 error6:
3243 ib_dealloc_pd(port_priv->pd);
3244 error4:
3245 ib_destroy_cq(port_priv->cq);
3246 cleanup_recv_queue(&port_priv->qp_info[1]);
3247 cleanup_recv_queue(&port_priv->qp_info[0]);
3248 error3:
3249 kfree(port_priv);
3250
3251 return ret;
3252 }
3253
3254 /*
3255 * Close the port
3256 * If there are no classes using the port, free the port
3257 * resources (CQ, MR, PD, QP) and remove the port's info structure
3258 */
ib_mad_port_close(struct ib_device * device,int port_num)3259 static int ib_mad_port_close(struct ib_device *device, int port_num)
3260 {
3261 struct ib_mad_port_private *port_priv;
3262 unsigned long flags;
3263
3264 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3265 port_priv = __ib_get_mad_port(device, port_num);
3266 if (port_priv == NULL) {
3267 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3268 dev_err(&device->dev, "Port %d not found\n", port_num);
3269 return -ENODEV;
3270 }
3271 list_del_init(&port_priv->port_list);
3272 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3273
3274 destroy_workqueue(port_priv->wq);
3275 destroy_mad_qp(&port_priv->qp_info[1]);
3276 destroy_mad_qp(&port_priv->qp_info[0]);
3277 ib_dealloc_pd(port_priv->pd);
3278 ib_destroy_cq(port_priv->cq);
3279 cleanup_recv_queue(&port_priv->qp_info[1]);
3280 cleanup_recv_queue(&port_priv->qp_info[0]);
3281 /* XXX: Handle deallocation of MAD registration tables */
3282
3283 kfree(port_priv);
3284
3285 return 0;
3286 }
3287
ib_mad_init_device(struct ib_device * device)3288 static void ib_mad_init_device(struct ib_device *device)
3289 {
3290 int start, i;
3291
3292 start = rdma_start_port(device);
3293
3294 for (i = start; i <= rdma_end_port(device); i++) {
3295 if (!rdma_cap_ib_mad(device, i))
3296 continue;
3297
3298 if (ib_mad_port_open(device, i)) {
3299 dev_err(&device->dev, "Couldn't open port %d\n", i);
3300 goto error;
3301 }
3302 if (ib_agent_port_open(device, i)) {
3303 dev_err(&device->dev,
3304 "Couldn't open port %d for agents\n", i);
3305 goto error_agent;
3306 }
3307 }
3308 return;
3309
3310 error_agent:
3311 if (ib_mad_port_close(device, i))
3312 dev_err(&device->dev, "Couldn't close port %d\n", i);
3313
3314 error:
3315 while (--i >= start) {
3316 if (!rdma_cap_ib_mad(device, i))
3317 continue;
3318
3319 if (ib_agent_port_close(device, i))
3320 dev_err(&device->dev,
3321 "Couldn't close port %d for agents\n", i);
3322 if (ib_mad_port_close(device, i))
3323 dev_err(&device->dev, "Couldn't close port %d\n", i);
3324 }
3325 }
3326
ib_mad_remove_device(struct ib_device * device,void * client_data)3327 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3328 {
3329 int i;
3330
3331 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3332 if (!rdma_cap_ib_mad(device, i))
3333 continue;
3334
3335 if (ib_agent_port_close(device, i))
3336 dev_err(&device->dev,
3337 "Couldn't close port %d for agents\n", i);
3338 if (ib_mad_port_close(device, i))
3339 dev_err(&device->dev, "Couldn't close port %d\n", i);
3340 }
3341 }
3342
3343 static struct ib_client mad_client = {
3344 .name = "mad",
3345 .add = ib_mad_init_device,
3346 .remove = ib_mad_remove_device
3347 };
3348
ib_mad_init_module(void)3349 static int __init ib_mad_init_module(void)
3350 {
3351 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3352 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3353
3354 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3355 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3356
3357 INIT_LIST_HEAD(&ib_mad_port_list);
3358
3359 if (ib_register_client(&mad_client)) {
3360 pr_err("Couldn't register ib_mad client\n");
3361 return -EINVAL;
3362 }
3363
3364 return 0;
3365 }
3366
ib_mad_cleanup_module(void)3367 static void __exit ib_mad_cleanup_module(void)
3368 {
3369 ib_unregister_client(&mad_client);
3370 }
3371
3372 module_init(ib_mad_init_module);
3373 module_exit(ib_mad_cleanup_module);
3374