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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / infiniband / core / mad.c
blob6f4287716ab1b63516e89197282925e30e86a279
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 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 */
35 #include <linux/dma-mapping.h>
36 #include <rdma/ib_cache.h>
37
38 #include "mad_priv.h"
39 #include "mad_rmpp.h"
40 #include "smi.h"
41 #include "agent.h"
42
43 MODULE_LICENSE("Dual BSD/GPL");
44 MODULE_DESCRIPTION("kernel IB MAD API");
45 MODULE_AUTHOR("Hal Rosenstock");
46 MODULE_AUTHOR("Sean Hefty");
47
48 static struct kmem_cache *ib_mad_cache;
49
50 static struct list_head ib_mad_port_list;
51 static u32 ib_mad_client_id = 0;
52
53 /* Port list lock */
54 static spinlock_t ib_mad_port_list_lock;
55
56
57 /* Forward declarations */
58 static int method_in_use(struct ib_mad_mgmt_method_table **method,
59 struct ib_mad_reg_req *mad_reg_req);
60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
61 static struct ib_mad_agent_private *find_mad_agent(
62 struct ib_mad_port_private *port_priv,
63 struct ib_mad *mad);
64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
65 struct ib_mad_private *mad);
66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
67 static void timeout_sends(struct work_struct *work);
68 static void local_completions(struct work_struct *work);
69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
70 struct ib_mad_agent_private *agent_priv,
71 u8 mgmt_class);
72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
73 struct ib_mad_agent_private *agent_priv);
74
75 /*
76 * Returns a ib_mad_port_private structure or NULL for a device/port
77 * Assumes ib_mad_port_list_lock is being held
78 */
79 static inline struct ib_mad_port_private *
80 __ib_get_mad_port(struct ib_device *device, int port_num)
81 {
82 struct ib_mad_port_private *entry;
83
84 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
85 if (entry->device == device && entry->port_num == port_num)
86 return entry;
87 }
88 return NULL;
89 }
90
91 /*
92 * Wrapper function to return a ib_mad_port_private structure or NULL
93 * for a device/port
94 */
95 static inline struct ib_mad_port_private *
96 ib_get_mad_port(struct ib_device *device, int port_num)
97 {
98 struct ib_mad_port_private *entry;
99 unsigned long flags;
100
101 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
102 entry = __ib_get_mad_port(device, port_num);
103 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
104
105 return entry;
106 }
107
108 static inline u8 convert_mgmt_class(u8 mgmt_class)
109 {
110 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
111 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
112 0 : mgmt_class;
113 }
114
115 static int get_spl_qp_index(enum ib_qp_type qp_type)
116 {
117 switch (qp_type)
118 {
119 case IB_QPT_SMI:
120 return 0;
121 case IB_QPT_GSI:
122 return 1;
123 default:
124 return -1;
125 }
126 }
127
128 static int vendor_class_index(u8 mgmt_class)
129 {
130 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
131 }
132
133 static int is_vendor_class(u8 mgmt_class)
134 {
135 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
136 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
137 return 0;
138 return 1;
139 }
140
141 static int is_vendor_oui(char *oui)
142 {
143 if (oui[0] || oui[1] || oui[2])
144 return 1;
145 return 0;
146 }
147
148 static int is_vendor_method_in_use(
149 struct ib_mad_mgmt_vendor_class *vendor_class,
150 struct ib_mad_reg_req *mad_reg_req)
151 {
152 struct ib_mad_mgmt_method_table *method;
153 int i;
154
155 for (i = 0; i < MAX_MGMT_OUI; i++) {
156 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
157 method = vendor_class->method_table[i];
158 if (method) {
159 if (method_in_use(&method, mad_reg_req))
160 return 1;
161 else
162 break;
163 }
164 }
165 }
166 return 0;
167 }
168
169 int ib_response_mad(struct ib_mad *mad)
170 {
171 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
172 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
173 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
174 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
175 }
176 EXPORT_SYMBOL(ib_response_mad);
177
178 /*
179 * ib_register_mad_agent - Register to send/receive MADs
180 */
181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
182 u8 port_num,
183 enum ib_qp_type qp_type,
184 struct ib_mad_reg_req *mad_reg_req,
185 u8 rmpp_version,
186 ib_mad_send_handler send_handler,
187 ib_mad_recv_handler recv_handler,
188 void *context)
189 {
190 struct ib_mad_port_private *port_priv;
191 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
192 struct ib_mad_agent_private *mad_agent_priv;
193 struct ib_mad_reg_req *reg_req = NULL;
194 struct ib_mad_mgmt_class_table *class;
195 struct ib_mad_mgmt_vendor_class_table *vendor;
196 struct ib_mad_mgmt_vendor_class *vendor_class;
197 struct ib_mad_mgmt_method_table *method;
198 int ret2, qpn;
199 unsigned long flags;
200 u8 mgmt_class, vclass;
201
202 /* Validate parameters */
203 qpn = get_spl_qp_index(qp_type);
204 if (qpn == -1)
205 goto error1;
206
207 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
208 goto error1;
209
210 /* Validate MAD registration request if supplied */
211 if (mad_reg_req) {
212 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
213 goto error1;
214 if (!recv_handler)
215 goto error1;
216 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
217 /*
218 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
219 * one in this range currently allowed
220 */
221 if (mad_reg_req->mgmt_class !=
222 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
223 goto error1;
224 } else if (mad_reg_req->mgmt_class == 0) {
225 /*
226 * Class 0 is reserved in IBA and is used for
227 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
228 */
229 goto error1;
230 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
231 /*
232 * If class is in "new" vendor range,
233 * ensure supplied OUI is not zero
234 */
235 if (!is_vendor_oui(mad_reg_req->oui))
236 goto error1;
237 }
238 /* Make sure class supplied is consistent with RMPP */
239 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
240 if (rmpp_version)
241 goto error1;
242 }
243 /* Make sure class supplied is consistent with QP type */
244 if (qp_type == IB_QPT_SMI) {
245 if ((mad_reg_req->mgmt_class !=
246 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
247 (mad_reg_req->mgmt_class !=
248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
249 goto error1;
250 } else {
251 if ((mad_reg_req->mgmt_class ==
252 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
253 (mad_reg_req->mgmt_class ==
254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
255 goto error1;
256 }
257 } else {
258 /* No registration request supplied */
259 if (!send_handler)
260 goto error1;
261 }
262
263 /* Validate device and port */
264 port_priv = ib_get_mad_port(device, port_num);
265 if (!port_priv) {
266 ret = ERR_PTR(-ENODEV);
267 goto error1;
268 }
269
270 /* Allocate structures */
271 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
272 if (!mad_agent_priv) {
273 ret = ERR_PTR(-ENOMEM);
274 goto error1;
275 }
276
277 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
278 IB_ACCESS_LOCAL_WRITE);
279 if (IS_ERR(mad_agent_priv->agent.mr)) {
280 ret = ERR_PTR(-ENOMEM);
281 goto error2;
282 }
283
284 if (mad_reg_req) {
285 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
286 if (!reg_req) {
287 ret = ERR_PTR(-ENOMEM);
288 goto error3;
289 }
290 /* Make a copy of the MAD registration request */
291 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
292 }
293
294 /* Now, fill in the various structures */
295 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
296 mad_agent_priv->reg_req = reg_req;
297 mad_agent_priv->agent.rmpp_version = rmpp_version;
298 mad_agent_priv->agent.device = device;
299 mad_agent_priv->agent.recv_handler = recv_handler;
300 mad_agent_priv->agent.send_handler = send_handler;
301 mad_agent_priv->agent.context = context;
302 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
303 mad_agent_priv->agent.port_num = port_num;
304
305 spin_lock_irqsave(&port_priv->reg_lock, flags);
306 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
307
308 /*
309 * Make sure MAD registration (if supplied)
310 * is non overlapping with any existing ones
311 */
312 if (mad_reg_req) {
313 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
314 if (!is_vendor_class(mgmt_class)) {
315 class = port_priv->version[mad_reg_req->
316 mgmt_class_version].class;
317 if (class) {
318 method = class->method_table[mgmt_class];
319 if (method) {
320 if (method_in_use(&method,
321 mad_reg_req))
322 goto error4;
323 }
324 }
325 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
326 mgmt_class);
327 } else {
328 /* "New" vendor class range */
329 vendor = port_priv->version[mad_reg_req->
330 mgmt_class_version].vendor;
331 if (vendor) {
332 vclass = vendor_class_index(mgmt_class);
333 vendor_class = vendor->vendor_class[vclass];
334 if (vendor_class) {
335 if (is_vendor_method_in_use(
336 vendor_class,
337 mad_reg_req))
338 goto error4;
339 }
340 }
341 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
342 }
343 if (ret2) {
344 ret = ERR_PTR(ret2);
345 goto error4;
346 }
347 }
348
349 /* Add mad agent into port's agent list */
350 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
351 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
352
353 spin_lock_init(&mad_agent_priv->lock);
354 INIT_LIST_HEAD(&mad_agent_priv->send_list);
355 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
356 INIT_LIST_HEAD(&mad_agent_priv->done_list);
357 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
358 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
359 INIT_LIST_HEAD(&mad_agent_priv->local_list);
360 INIT_WORK(&mad_agent_priv->local_work, local_completions);
361 atomic_set(&mad_agent_priv->refcount, 1);
362 init_completion(&mad_agent_priv->comp);
363
364 return &mad_agent_priv->agent;
365
366 error4:
367 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
368 kfree(reg_req);
369 error3:
370 ib_dereg_mr(mad_agent_priv->agent.mr);
371 error2:
372 kfree(mad_agent_priv);
373 error1:
374 return ret;
375 }
376 EXPORT_SYMBOL(ib_register_mad_agent);
377
378 static inline int is_snooping_sends(int mad_snoop_flags)
379 {
380 return (mad_snoop_flags &
381 (/*IB_MAD_SNOOP_POSTED_SENDS |
382 IB_MAD_SNOOP_RMPP_SENDS |*/
383 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
384 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
385 }
386
387 static inline int is_snooping_recvs(int mad_snoop_flags)
388 {
389 return (mad_snoop_flags &
390 (IB_MAD_SNOOP_RECVS /*|
391 IB_MAD_SNOOP_RMPP_RECVS*/));
392 }
393
394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
395 struct ib_mad_snoop_private *mad_snoop_priv)
396 {
397 struct ib_mad_snoop_private **new_snoop_table;
398 unsigned long flags;
399 int i;
400
401 spin_lock_irqsave(&qp_info->snoop_lock, flags);
402 /* Check for empty slot in array. */
403 for (i = 0; i < qp_info->snoop_table_size; i++)
404 if (!qp_info->snoop_table[i])
405 break;
406
407 if (i == qp_info->snoop_table_size) {
408 /* Grow table. */
409 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
410 qp_info->snoop_table_size + 1,
411 GFP_ATOMIC);
412 if (!new_snoop_table) {
413 i = -ENOMEM;
414 goto out;
415 }
416 if (qp_info->snoop_table) {
417 memcpy(new_snoop_table, qp_info->snoop_table,
418 sizeof mad_snoop_priv *
419 qp_info->snoop_table_size);
420 kfree(qp_info->snoop_table);
421 }
422 qp_info->snoop_table = new_snoop_table;
423 qp_info->snoop_table_size++;
424 }
425 qp_info->snoop_table[i] = mad_snoop_priv;
426 atomic_inc(&qp_info->snoop_count);
427 out:
428 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
429 return i;
430 }
431
432 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
433 u8 port_num,
434 enum ib_qp_type qp_type,
435 int mad_snoop_flags,
436 ib_mad_snoop_handler snoop_handler,
437 ib_mad_recv_handler recv_handler,
438 void *context)
439 {
440 struct ib_mad_port_private *port_priv;
441 struct ib_mad_agent *ret;
442 struct ib_mad_snoop_private *mad_snoop_priv;
443 int qpn;
444
445 /* Validate parameters */
446 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
447 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
448 ret = ERR_PTR(-EINVAL);
449 goto error1;
450 }
451 qpn = get_spl_qp_index(qp_type);
452 if (qpn == -1) {
453 ret = ERR_PTR(-EINVAL);
454 goto error1;
455 }
456 port_priv = ib_get_mad_port(device, port_num);
457 if (!port_priv) {
458 ret = ERR_PTR(-ENODEV);
459 goto error1;
460 }
461 /* Allocate structures */
462 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
463 if (!mad_snoop_priv) {
464 ret = ERR_PTR(-ENOMEM);
465 goto error1;
466 }
467
468 /* Now, fill in the various structures */
469 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
470 mad_snoop_priv->agent.device = device;
471 mad_snoop_priv->agent.recv_handler = recv_handler;
472 mad_snoop_priv->agent.snoop_handler = snoop_handler;
473 mad_snoop_priv->agent.context = context;
474 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
475 mad_snoop_priv->agent.port_num = port_num;
476 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
477 init_completion(&mad_snoop_priv->comp);
478 mad_snoop_priv->snoop_index = register_snoop_agent(
479 &port_priv->qp_info[qpn],
480 mad_snoop_priv);
481 if (mad_snoop_priv->snoop_index < 0) {
482 ret = ERR_PTR(mad_snoop_priv->snoop_index);
483 goto error2;
484 }
485
486 atomic_set(&mad_snoop_priv->refcount, 1);
487 return &mad_snoop_priv->agent;
488
489 error2:
490 kfree(mad_snoop_priv);
491 error1:
492 return ret;
493 }
494 EXPORT_SYMBOL(ib_register_mad_snoop);
495
496 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
497 {
498 if (atomic_dec_and_test(&mad_agent_priv->refcount))
499 complete(&mad_agent_priv->comp);
500 }
501
502 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
503 {
504 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
505 complete(&mad_snoop_priv->comp);
506 }
507
508 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
509 {
510 struct ib_mad_port_private *port_priv;
511 unsigned long flags;
512
513 /* Note that we could still be handling received MADs */
514
515 /*
516 * Canceling all sends results in dropping received response
517 * MADs, preventing us from queuing additional work
518 */
519 cancel_mads(mad_agent_priv);
520 port_priv = mad_agent_priv->qp_info->port_priv;
521 cancel_delayed_work(&mad_agent_priv->timed_work);
522
523 spin_lock_irqsave(&port_priv->reg_lock, flags);
524 remove_mad_reg_req(mad_agent_priv);
525 list_del(&mad_agent_priv->agent_list);
526 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
527
528 flush_workqueue(port_priv->wq);
529 ib_cancel_rmpp_recvs(mad_agent_priv);
530
531 deref_mad_agent(mad_agent_priv);
532 wait_for_completion(&mad_agent_priv->comp);
533
534 kfree(mad_agent_priv->reg_req);
535 ib_dereg_mr(mad_agent_priv->agent.mr);
536 kfree(mad_agent_priv);
537 }
538
539 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
540 {
541 struct ib_mad_qp_info *qp_info;
542 unsigned long flags;
543
544 qp_info = mad_snoop_priv->qp_info;
545 spin_lock_irqsave(&qp_info->snoop_lock, flags);
546 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
547 atomic_dec(&qp_info->snoop_count);
548 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
549
550 deref_snoop_agent(mad_snoop_priv);
551 wait_for_completion(&mad_snoop_priv->comp);
552
553 kfree(mad_snoop_priv);
554 }
555
556 /*
557 * ib_unregister_mad_agent - Unregisters a client from using MAD services
558 */
559 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
560 {
561 struct ib_mad_agent_private *mad_agent_priv;
562 struct ib_mad_snoop_private *mad_snoop_priv;
563
564 /* If the TID is zero, the agent can only snoop. */
565 if (mad_agent->hi_tid) {
566 mad_agent_priv = container_of(mad_agent,
567 struct ib_mad_agent_private,
568 agent);
569 unregister_mad_agent(mad_agent_priv);
570 } else {
571 mad_snoop_priv = container_of(mad_agent,
572 struct ib_mad_snoop_private,
573 agent);
574 unregister_mad_snoop(mad_snoop_priv);
575 }
576 return 0;
577 }
578 EXPORT_SYMBOL(ib_unregister_mad_agent);
579
580 static void dequeue_mad(struct ib_mad_list_head *mad_list)
581 {
582 struct ib_mad_queue *mad_queue;
583 unsigned long flags;
584
585 BUG_ON(!mad_list->mad_queue);
586 mad_queue = mad_list->mad_queue;
587 spin_lock_irqsave(&mad_queue->lock, flags);
588 list_del(&mad_list->list);
589 mad_queue->count--;
590 spin_unlock_irqrestore(&mad_queue->lock, flags);
591 }
592
593 static void snoop_send(struct ib_mad_qp_info *qp_info,
594 struct ib_mad_send_buf *send_buf,
595 struct ib_mad_send_wc *mad_send_wc,
596 int mad_snoop_flags)
597 {
598 struct ib_mad_snoop_private *mad_snoop_priv;
599 unsigned long flags;
600 int i;
601
602 spin_lock_irqsave(&qp_info->snoop_lock, flags);
603 for (i = 0; i < qp_info->snoop_table_size; i++) {
604 mad_snoop_priv = qp_info->snoop_table[i];
605 if (!mad_snoop_priv ||
606 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
607 continue;
608
609 atomic_inc(&mad_snoop_priv->refcount);
610 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
611 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
612 send_buf, mad_send_wc);
613 deref_snoop_agent(mad_snoop_priv);
614 spin_lock_irqsave(&qp_info->snoop_lock, flags);
615 }
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617 }
618
619 static void snoop_recv(struct ib_mad_qp_info *qp_info,
620 struct ib_mad_recv_wc *mad_recv_wc,
621 int mad_snoop_flags)
622 {
623 struct ib_mad_snoop_private *mad_snoop_priv;
624 unsigned long flags;
625 int i;
626
627 spin_lock_irqsave(&qp_info->snoop_lock, flags);
628 for (i = 0; i < qp_info->snoop_table_size; i++) {
629 mad_snoop_priv = qp_info->snoop_table[i];
630 if (!mad_snoop_priv ||
631 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
632 continue;
633
634 atomic_inc(&mad_snoop_priv->refcount);
635 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
636 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
637 mad_recv_wc);
638 deref_snoop_agent(mad_snoop_priv);
639 spin_lock_irqsave(&qp_info->snoop_lock, flags);
640 }
641 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
642 }
643
644 static void build_smp_wc(struct ib_qp *qp,
645 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
646 struct ib_wc *wc)
647 {
648 memset(wc, 0, sizeof *wc);
649 wc->wr_id = wr_id;
650 wc->status = IB_WC_SUCCESS;
651 wc->opcode = IB_WC_RECV;
652 wc->pkey_index = pkey_index;
653 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
654 wc->src_qp = IB_QP0;
655 wc->qp = qp;
656 wc->slid = slid;
657 wc->sl = 0;
658 wc->dlid_path_bits = 0;
659 wc->port_num = port_num;
660 }
661
662 /*
663 * Return 0 if SMP is to be sent
664 * Return 1 if SMP was consumed locally (whether or not solicited)
665 * Return < 0 if error
666 */
667 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
668 struct ib_mad_send_wr_private *mad_send_wr)
669 {
670 int ret = 0;
671 struct ib_smp *smp = mad_send_wr->send_buf.mad;
672 unsigned long flags;
673 struct ib_mad_local_private *local;
674 struct ib_mad_private *mad_priv;
675 struct ib_mad_port_private *port_priv;
676 struct ib_mad_agent_private *recv_mad_agent = NULL;
677 struct ib_device *device = mad_agent_priv->agent.device;
678 u8 port_num;
679 struct ib_wc mad_wc;
680 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
681
682 if (device->node_type == RDMA_NODE_IB_SWITCH &&
683 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
684 port_num = send_wr->wr.ud.port_num;
685 else
686 port_num = mad_agent_priv->agent.port_num;
687
688 /*
689 * Directed route handling starts if the initial LID routed part of
690 * a request or the ending LID routed part of a response is empty.
691 * If we are at the start of the LID routed part, don't update the
692 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
693 */
694 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
695 IB_LID_PERMISSIVE &&
696 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
697 IB_SMI_DISCARD) {
698 ret = -EINVAL;
699 printk(KERN_ERR PFX "Invalid directed route\n");
700 goto out;
701 }
702
703 /* Check to post send on QP or process locally */
704 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD)
705 goto out;
706
707 local = kmalloc(sizeof *local, GFP_ATOMIC);
708 if (!local) {
709 ret = -ENOMEM;
710 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
711 goto out;
712 }
713 local->mad_priv = NULL;
714 local->recv_mad_agent = NULL;
715 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
716 if (!mad_priv) {
717 ret = -ENOMEM;
718 printk(KERN_ERR PFX "No memory for local response MAD\n");
719 kfree(local);
720 goto out;
721 }
722
723 build_smp_wc(mad_agent_priv->agent.qp,
724 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
725 send_wr->wr.ud.pkey_index,
726 send_wr->wr.ud.port_num, &mad_wc);
727
728 /* No GRH for DR SMP */
729 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
730 (struct ib_mad *)smp,
731 (struct ib_mad *)&mad_priv->mad);
732 switch (ret)
733 {
734 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
735 if (ib_response_mad(&mad_priv->mad.mad) &&
736 mad_agent_priv->agent.recv_handler) {
737 local->mad_priv = mad_priv;
738 local->recv_mad_agent = mad_agent_priv;
739 /*
740 * Reference MAD agent until receive
741 * side of local completion handled
742 */
743 atomic_inc(&mad_agent_priv->refcount);
744 } else
745 kmem_cache_free(ib_mad_cache, mad_priv);
746 break;
747 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
748 kmem_cache_free(ib_mad_cache, mad_priv);
749 break;
750 case IB_MAD_RESULT_SUCCESS:
751 /* Treat like an incoming receive MAD */
752 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
753 mad_agent_priv->agent.port_num);
754 if (port_priv) {
755 mad_priv->mad.mad.mad_hdr.tid =
756 ((struct ib_mad *)smp)->mad_hdr.tid;
757 recv_mad_agent = find_mad_agent(port_priv,
758 &mad_priv->mad.mad);
759 }
760 if (!port_priv || !recv_mad_agent) {
761 kmem_cache_free(ib_mad_cache, mad_priv);
762 kfree(local);
763 ret = 0;
764 goto out;
765 }
766 local->mad_priv = mad_priv;
767 local->recv_mad_agent = recv_mad_agent;
768 break;
769 default:
770 kmem_cache_free(ib_mad_cache, mad_priv);
771 kfree(local);
772 ret = -EINVAL;
773 goto out;
774 }
775
776 local->mad_send_wr = mad_send_wr;
777 /* Reference MAD agent until send side of local completion handled */
778 atomic_inc(&mad_agent_priv->refcount);
779 /* Queue local completion to local list */
780 spin_lock_irqsave(&mad_agent_priv->lock, flags);
781 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
782 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
783 queue_work(mad_agent_priv->qp_info->port_priv->wq,
784 &mad_agent_priv->local_work);
785 ret = 1;
786 out:
787 return ret;
788 }
789
790 static int get_pad_size(int hdr_len, int data_len)
791 {
792 int seg_size, pad;
793
794 seg_size = sizeof(struct ib_mad) - hdr_len;
795 if (data_len && seg_size) {
796 pad = seg_size - data_len % seg_size;
797 return pad == seg_size ? 0 : pad;
798 } else
799 return seg_size;
800 }
801
802 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
803 {
804 struct ib_rmpp_segment *s, *t;
805
806 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
807 list_del(&s->list);
808 kfree(s);
809 }
810 }
811
812 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
813 gfp_t gfp_mask)
814 {
815 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
816 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
817 struct ib_rmpp_segment *seg = NULL;
818 int left, seg_size, pad;
819
820 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
821 seg_size = send_buf->seg_size;
822 pad = send_wr->pad;
823
824 /* Allocate data segments. */
825 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
826 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
827 if (!seg) {
828 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
829 "alloc failed for len %zd, gfp %#x\n",
830 sizeof (*seg) + seg_size, gfp_mask);
831 free_send_rmpp_list(send_wr);
832 return -ENOMEM;
833 }
834 seg->num = ++send_buf->seg_count;
835 list_add_tail(&seg->list, &send_wr->rmpp_list);
836 }
837
838 /* Zero any padding */
839 if (pad)
840 memset(seg->data + seg_size - pad, 0, pad);
841
842 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
843 agent.rmpp_version;
844 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
845 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
846
847 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
848 struct ib_rmpp_segment, list);
849 send_wr->last_ack_seg = send_wr->cur_seg;
850 return 0;
851 }
852
853 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
854 u32 remote_qpn, u16 pkey_index,
855 int rmpp_active,
856 int hdr_len, int data_len,
857 gfp_t gfp_mask)
858 {
859 struct ib_mad_agent_private *mad_agent_priv;
860 struct ib_mad_send_wr_private *mad_send_wr;
861 int pad, message_size, ret, size;
862 void *buf;
863
864 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
865 agent);
866 pad = get_pad_size(hdr_len, data_len);
867 message_size = hdr_len + data_len + pad;
868
869 if ((!mad_agent->rmpp_version &&
870 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
871 (!rmpp_active && message_size > sizeof(struct ib_mad)))
872 return ERR_PTR(-EINVAL);
873
874 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
875 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
876 if (!buf)
877 return ERR_PTR(-ENOMEM);
878
879 mad_send_wr = buf + size;
880 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
881 mad_send_wr->send_buf.mad = buf;
882 mad_send_wr->send_buf.hdr_len = hdr_len;
883 mad_send_wr->send_buf.data_len = data_len;
884 mad_send_wr->pad = pad;
885
886 mad_send_wr->mad_agent_priv = mad_agent_priv;
887 mad_send_wr->sg_list[0].length = hdr_len;
888 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
889 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
890 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
891
892 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
893 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
894 mad_send_wr->send_wr.num_sge = 2;
895 mad_send_wr->send_wr.opcode = IB_WR_SEND;
896 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
897 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
898 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
899 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
900
901 if (rmpp_active) {
902 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
903 if (ret) {
904 kfree(buf);
905 return ERR_PTR(ret);
906 }
907 }
908
909 mad_send_wr->send_buf.mad_agent = mad_agent;
910 atomic_inc(&mad_agent_priv->refcount);
911 return &mad_send_wr->send_buf;
912 }
913 EXPORT_SYMBOL(ib_create_send_mad);
914
915 int ib_get_mad_data_offset(u8 mgmt_class)
916 {
917 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
918 return IB_MGMT_SA_HDR;
919 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
920 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
921 (mgmt_class == IB_MGMT_CLASS_BIS))
922 return IB_MGMT_DEVICE_HDR;
923 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
924 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
925 return IB_MGMT_VENDOR_HDR;
926 else
927 return IB_MGMT_MAD_HDR;
928 }
929 EXPORT_SYMBOL(ib_get_mad_data_offset);
930
931 int ib_is_mad_class_rmpp(u8 mgmt_class)
932 {
933 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
934 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
935 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
936 (mgmt_class == IB_MGMT_CLASS_BIS) ||
937 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
938 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
939 return 1;
940 return 0;
941 }
942 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
943
944 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
945 {
946 struct ib_mad_send_wr_private *mad_send_wr;
947 struct list_head *list;
948
949 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
950 send_buf);
951 list = &mad_send_wr->cur_seg->list;
952
953 if (mad_send_wr->cur_seg->num < seg_num) {
954 list_for_each_entry(mad_send_wr->cur_seg, list, list)
955 if (mad_send_wr->cur_seg->num == seg_num)
956 break;
957 } else if (mad_send_wr->cur_seg->num > seg_num) {
958 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
959 if (mad_send_wr->cur_seg->num == seg_num)
960 break;
961 }
962 return mad_send_wr->cur_seg->data;
963 }
964 EXPORT_SYMBOL(ib_get_rmpp_segment);
965
966 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
967 {
968 if (mad_send_wr->send_buf.seg_count)
969 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
970 mad_send_wr->seg_num);
971 else
972 return mad_send_wr->send_buf.mad +
973 mad_send_wr->send_buf.hdr_len;
974 }
975
976 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
977 {
978 struct ib_mad_agent_private *mad_agent_priv;
979 struct ib_mad_send_wr_private *mad_send_wr;
980
981 mad_agent_priv = container_of(send_buf->mad_agent,
982 struct ib_mad_agent_private, agent);
983 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
984 send_buf);
985
986 free_send_rmpp_list(mad_send_wr);
987 kfree(send_buf->mad);
988 deref_mad_agent(mad_agent_priv);
989 }
990 EXPORT_SYMBOL(ib_free_send_mad);
991
992 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
993 {
994 struct ib_mad_qp_info *qp_info;
995 struct list_head *list;
996 struct ib_send_wr *bad_send_wr;
997 struct ib_mad_agent *mad_agent;
998 struct ib_sge *sge;
999 unsigned long flags;
1000 int ret;
1001
1002 /* Set WR ID to find mad_send_wr upon completion */
1003 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1004 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1005 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1006
1007 mad_agent = mad_send_wr->send_buf.mad_agent;
1008 sge = mad_send_wr->sg_list;
1009 sge[0].addr = ib_dma_map_single(mad_agent->device,
1010 mad_send_wr->send_buf.mad,
1011 sge[0].length,
1012 DMA_TO_DEVICE);
1013 mad_send_wr->header_mapping = sge[0].addr;
1014
1015 sge[1].addr = ib_dma_map_single(mad_agent->device,
1016 ib_get_payload(mad_send_wr),
1017 sge[1].length,
1018 DMA_TO_DEVICE);
1019 mad_send_wr->payload_mapping = sge[1].addr;
1020
1021 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1022 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1023 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1024 &bad_send_wr);
1025 list = &qp_info->send_queue.list;
1026 } else {
1027 ret = 0;
1028 list = &qp_info->overflow_list;
1029 }
1030
1031 if (!ret) {
1032 qp_info->send_queue.count++;
1033 list_add_tail(&mad_send_wr->mad_list.list, list);
1034 }
1035 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1036 if (ret) {
1037 ib_dma_unmap_single(mad_agent->device,
1038 mad_send_wr->header_mapping,
1039 sge[0].length, DMA_TO_DEVICE);
1040 ib_dma_unmap_single(mad_agent->device,
1041 mad_send_wr->payload_mapping,
1042 sge[1].length, DMA_TO_DEVICE);
1043 }
1044 return ret;
1045 }
1046
1047 /*
1048 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1049 * with the registered client
1050 */
1051 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1052 struct ib_mad_send_buf **bad_send_buf)
1053 {
1054 struct ib_mad_agent_private *mad_agent_priv;
1055 struct ib_mad_send_buf *next_send_buf;
1056 struct ib_mad_send_wr_private *mad_send_wr;
1057 unsigned long flags;
1058 int ret = -EINVAL;
1059
1060 /* Walk list of send WRs and post each on send list */
1061 for (; send_buf; send_buf = next_send_buf) {
1062
1063 mad_send_wr = container_of(send_buf,
1064 struct ib_mad_send_wr_private,
1065 send_buf);
1066 mad_agent_priv = mad_send_wr->mad_agent_priv;
1067
1068 if (!send_buf->mad_agent->send_handler ||
1069 (send_buf->timeout_ms &&
1070 !send_buf->mad_agent->recv_handler)) {
1071 ret = -EINVAL;
1072 goto error;
1073 }
1074
1075 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1076 if (mad_agent_priv->agent.rmpp_version) {
1077 ret = -EINVAL;
1078 goto error;
1079 }
1080 }
1081
1082 /*
1083 * Save pointer to next work request to post in case the
1084 * current one completes, and the user modifies the work
1085 * request associated with the completion
1086 */
1087 next_send_buf = send_buf->next;
1088 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1089
1090 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1091 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1092 ret = handle_outgoing_dr_smp(mad_agent_priv,
1093 mad_send_wr);
1094 if (ret < 0) /* error */
1095 goto error;
1096 else if (ret == 1) /* locally consumed */
1097 continue;
1098 }
1099
1100 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1101 /* Timeout will be updated after send completes */
1102 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1103 mad_send_wr->retries = send_buf->retries;
1104 /* Reference for work request to QP + response */
1105 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1106 mad_send_wr->status = IB_WC_SUCCESS;
1107
1108 /* Reference MAD agent until send completes */
1109 atomic_inc(&mad_agent_priv->refcount);
1110 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1111 list_add_tail(&mad_send_wr->agent_list,
1112 &mad_agent_priv->send_list);
1113 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1114
1115 if (mad_agent_priv->agent.rmpp_version) {
1116 ret = ib_send_rmpp_mad(mad_send_wr);
1117 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1118 ret = ib_send_mad(mad_send_wr);
1119 } else
1120 ret = ib_send_mad(mad_send_wr);
1121 if (ret < 0) {
1122 /* Fail send request */
1123 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1124 list_del(&mad_send_wr->agent_list);
1125 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1126 atomic_dec(&mad_agent_priv->refcount);
1127 goto error;
1128 }
1129 }
1130 return 0;
1131 error:
1132 if (bad_send_buf)
1133 *bad_send_buf = send_buf;
1134 return ret;
1135 }
1136 EXPORT_SYMBOL(ib_post_send_mad);
1137
1138 /*
1139 * ib_free_recv_mad - Returns data buffers used to receive
1140 * a MAD to the access layer
1141 */
1142 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1143 {
1144 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1145 struct ib_mad_private_header *mad_priv_hdr;
1146 struct ib_mad_private *priv;
1147 struct list_head free_list;
1148
1149 INIT_LIST_HEAD(&free_list);
1150 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1151
1152 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1153 &free_list, list) {
1154 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1155 recv_buf);
1156 mad_priv_hdr = container_of(mad_recv_wc,
1157 struct ib_mad_private_header,
1158 recv_wc);
1159 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1160 header);
1161 kmem_cache_free(ib_mad_cache, priv);
1162 }
1163 }
1164 EXPORT_SYMBOL(ib_free_recv_mad);
1165
1166 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1167 u8 rmpp_version,
1168 ib_mad_send_handler send_handler,
1169 ib_mad_recv_handler recv_handler,
1170 void *context)
1171 {
1172 return ERR_PTR(-EINVAL); /* XXX: for now */
1173 }
1174 EXPORT_SYMBOL(ib_redirect_mad_qp);
1175
1176 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1177 struct ib_wc *wc)
1178 {
1179 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1180 return 0;
1181 }
1182 EXPORT_SYMBOL(ib_process_mad_wc);
1183
1184 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1185 struct ib_mad_reg_req *mad_reg_req)
1186 {
1187 int i;
1188
1189 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1190 i < IB_MGMT_MAX_METHODS;
1191 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1192 1+i)) {
1193 if ((*method)->agent[i]) {
1194 printk(KERN_ERR PFX "Method %d already in use\n", i);
1195 return -EINVAL;
1196 }
1197 }
1198 return 0;
1199 }
1200
1201 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1202 {
1203 /* Allocate management method table */
1204 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1205 if (!*method) {
1206 printk(KERN_ERR PFX "No memory for "
1207 "ib_mad_mgmt_method_table\n");
1208 return -ENOMEM;
1209 }
1210
1211 return 0;
1212 }
1213
1214 /*
1215 * Check to see if there are any methods still in use
1216 */
1217 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1218 {
1219 int i;
1220
1221 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1222 if (method->agent[i])
1223 return 1;
1224 return 0;
1225 }
1226
1227 /*
1228 * Check to see if there are any method tables for this class still in use
1229 */
1230 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1231 {
1232 int i;
1233
1234 for (i = 0; i < MAX_MGMT_CLASS; i++)
1235 if (class->method_table[i])
1236 return 1;
1237 return 0;
1238 }
1239
1240 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1241 {
1242 int i;
1243
1244 for (i = 0; i < MAX_MGMT_OUI; i++)
1245 if (vendor_class->method_table[i])
1246 return 1;
1247 return 0;
1248 }
1249
1250 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1251 char *oui)
1252 {
1253 int i;
1254
1255 for (i = 0; i < MAX_MGMT_OUI; i++)
1256 /* Is there matching OUI for this vendor class ? */
1257 if (!memcmp(vendor_class->oui[i], oui, 3))
1258 return i;
1259
1260 return -1;
1261 }
1262
1263 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1264 {
1265 int i;
1266
1267 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1268 if (vendor->vendor_class[i])
1269 return 1;
1270
1271 return 0;
1272 }
1273
1274 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1275 struct ib_mad_agent_private *agent)
1276 {
1277 int i;
1278
1279 /* Remove any methods for this mad agent */
1280 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1281 if (method->agent[i] == agent) {
1282 method->agent[i] = NULL;
1283 }
1284 }
1285 }
1286
1287 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1288 struct ib_mad_agent_private *agent_priv,
1289 u8 mgmt_class)
1290 {
1291 struct ib_mad_port_private *port_priv;
1292 struct ib_mad_mgmt_class_table **class;
1293 struct ib_mad_mgmt_method_table **method;
1294 int i, ret;
1295
1296 port_priv = agent_priv->qp_info->port_priv;
1297 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1298 if (!*class) {
1299 /* Allocate management class table for "new" class version */
1300 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1301 if (!*class) {
1302 printk(KERN_ERR PFX "No memory for "
1303 "ib_mad_mgmt_class_table\n");
1304 ret = -ENOMEM;
1305 goto error1;
1306 }
1307
1308 /* Allocate method table for this management class */
1309 method = &(*class)->method_table[mgmt_class];
1310 if ((ret = allocate_method_table(method)))
1311 goto error2;
1312 } else {
1313 method = &(*class)->method_table[mgmt_class];
1314 if (!*method) {
1315 /* Allocate method table for this management class */
1316 if ((ret = allocate_method_table(method)))
1317 goto error1;
1318 }
1319 }
1320
1321 /* Now, make sure methods are not already in use */
1322 if (method_in_use(method, mad_reg_req))
1323 goto error3;
1324
1325 /* Finally, add in methods being registered */
1326 for (i = find_first_bit(mad_reg_req->method_mask,
1327 IB_MGMT_MAX_METHODS);
1328 i < IB_MGMT_MAX_METHODS;
1329 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1330 1+i)) {
1331 (*method)->agent[i] = agent_priv;
1332 }
1333 return 0;
1334
1335 error3:
1336 /* Remove any methods for this mad agent */
1337 remove_methods_mad_agent(*method, agent_priv);
1338 /* Now, check to see if there are any methods in use */
1339 if (!check_method_table(*method)) {
1340 /* If not, release management method table */
1341 kfree(*method);
1342 *method = NULL;
1343 }
1344 ret = -EINVAL;
1345 goto error1;
1346 error2:
1347 kfree(*class);
1348 *class = NULL;
1349 error1:
1350 return ret;
1351 }
1352
1353 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1354 struct ib_mad_agent_private *agent_priv)
1355 {
1356 struct ib_mad_port_private *port_priv;
1357 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1358 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1359 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1360 struct ib_mad_mgmt_method_table **method;
1361 int i, ret = -ENOMEM;
1362 u8 vclass;
1363
1364 /* "New" vendor (with OUI) class */
1365 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1366 port_priv = agent_priv->qp_info->port_priv;
1367 vendor_table = &port_priv->version[
1368 mad_reg_req->mgmt_class_version].vendor;
1369 if (!*vendor_table) {
1370 /* Allocate mgmt vendor class table for "new" class version */
1371 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1372 if (!vendor) {
1373 printk(KERN_ERR PFX "No memory for "
1374 "ib_mad_mgmt_vendor_class_table\n");
1375 goto error1;
1376 }
1377
1378 *vendor_table = vendor;
1379 }
1380 if (!(*vendor_table)->vendor_class[vclass]) {
1381 /* Allocate table for this management vendor class */
1382 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1383 if (!vendor_class) {
1384 printk(KERN_ERR PFX "No memory for "
1385 "ib_mad_mgmt_vendor_class\n");
1386 goto error2;
1387 }
1388
1389 (*vendor_table)->vendor_class[vclass] = vendor_class;
1390 }
1391 for (i = 0; i < MAX_MGMT_OUI; i++) {
1392 /* Is there matching OUI for this vendor class ? */
1393 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1394 mad_reg_req->oui, 3)) {
1395 method = &(*vendor_table)->vendor_class[
1396 vclass]->method_table[i];
1397 BUG_ON(!*method);
1398 goto check_in_use;
1399 }
1400 }
1401 for (i = 0; i < MAX_MGMT_OUI; i++) {
1402 /* OUI slot available ? */
1403 if (!is_vendor_oui((*vendor_table)->vendor_class[
1404 vclass]->oui[i])) {
1405 method = &(*vendor_table)->vendor_class[
1406 vclass]->method_table[i];
1407 BUG_ON(*method);
1408 /* Allocate method table for this OUI */
1409 if ((ret = allocate_method_table(method)))
1410 goto error3;
1411 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1412 mad_reg_req->oui, 3);
1413 goto check_in_use;
1414 }
1415 }
1416 printk(KERN_ERR PFX "All OUI slots in use\n");
1417 goto error3;
1418
1419 check_in_use:
1420 /* Now, make sure methods are not already in use */
1421 if (method_in_use(method, mad_reg_req))
1422 goto error4;
1423
1424 /* Finally, add in methods being registered */
1425 for (i = find_first_bit(mad_reg_req->method_mask,
1426 IB_MGMT_MAX_METHODS);
1427 i < IB_MGMT_MAX_METHODS;
1428 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1429 1+i)) {
1430 (*method)->agent[i] = agent_priv;
1431 }
1432 return 0;
1433
1434 error4:
1435 /* Remove any methods for this mad agent */
1436 remove_methods_mad_agent(*method, agent_priv);
1437 /* Now, check to see if there are any methods in use */
1438 if (!check_method_table(*method)) {
1439 /* If not, release management method table */
1440 kfree(*method);
1441 *method = NULL;
1442 }
1443 ret = -EINVAL;
1444 error3:
1445 if (vendor_class) {
1446 (*vendor_table)->vendor_class[vclass] = NULL;
1447 kfree(vendor_class);
1448 }
1449 error2:
1450 if (vendor) {
1451 *vendor_table = NULL;
1452 kfree(vendor);
1453 }
1454 error1:
1455 return ret;
1456 }
1457
1458 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1459 {
1460 struct ib_mad_port_private *port_priv;
1461 struct ib_mad_mgmt_class_table *class;
1462 struct ib_mad_mgmt_method_table *method;
1463 struct ib_mad_mgmt_vendor_class_table *vendor;
1464 struct ib_mad_mgmt_vendor_class *vendor_class;
1465 int index;
1466 u8 mgmt_class;
1467
1468 /*
1469 * Was MAD registration request supplied
1470 * with original registration ?
1471 */
1472 if (!agent_priv->reg_req) {
1473 goto out;
1474 }
1475
1476 port_priv = agent_priv->qp_info->port_priv;
1477 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1478 class = port_priv->version[
1479 agent_priv->reg_req->mgmt_class_version].class;
1480 if (!class)
1481 goto vendor_check;
1482
1483 method = class->method_table[mgmt_class];
1484 if (method) {
1485 /* Remove any methods for this mad agent */
1486 remove_methods_mad_agent(method, agent_priv);
1487 /* Now, check to see if there are any methods still in use */
1488 if (!check_method_table(method)) {
1489 /* If not, release management method table */
1490 kfree(method);
1491 class->method_table[mgmt_class] = NULL;
1492 /* Any management classes left ? */
1493 if (!check_class_table(class)) {
1494 /* If not, release management class table */
1495 kfree(class);
1496 port_priv->version[
1497 agent_priv->reg_req->
1498 mgmt_class_version].class = NULL;
1499 }
1500 }
1501 }
1502
1503 vendor_check:
1504 if (!is_vendor_class(mgmt_class))
1505 goto out;
1506
1507 /* normalize mgmt_class to vendor range 2 */
1508 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1509 vendor = port_priv->version[
1510 agent_priv->reg_req->mgmt_class_version].vendor;
1511
1512 if (!vendor)
1513 goto out;
1514
1515 vendor_class = vendor->vendor_class[mgmt_class];
1516 if (vendor_class) {
1517 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1518 if (index < 0)
1519 goto out;
1520 method = vendor_class->method_table[index];
1521 if (method) {
1522 /* Remove any methods for this mad agent */
1523 remove_methods_mad_agent(method, agent_priv);
1524 /*
1525 * Now, check to see if there are
1526 * any methods still in use
1527 */
1528 if (!check_method_table(method)) {
1529 /* If not, release management method table */
1530 kfree(method);
1531 vendor_class->method_table[index] = NULL;
1532 memset(vendor_class->oui[index], 0, 3);
1533 /* Any OUIs left ? */
1534 if (!check_vendor_class(vendor_class)) {
1535 /* If not, release vendor class table */
1536 kfree(vendor_class);
1537 vendor->vendor_class[mgmt_class] = NULL;
1538 /* Any other vendor classes left ? */
1539 if (!check_vendor_table(vendor)) {
1540 kfree(vendor);
1541 port_priv->version[
1542 agent_priv->reg_req->
1543 mgmt_class_version].
1544 vendor = NULL;
1545 }
1546 }
1547 }
1548 }
1549 }
1550
1551 out:
1552 return;
1553 }
1554
1555 static struct ib_mad_agent_private *
1556 find_mad_agent(struct ib_mad_port_private *port_priv,
1557 struct ib_mad *mad)
1558 {
1559 struct ib_mad_agent_private *mad_agent = NULL;
1560 unsigned long flags;
1561
1562 spin_lock_irqsave(&port_priv->reg_lock, flags);
1563 if (ib_response_mad(mad)) {
1564 u32 hi_tid;
1565 struct ib_mad_agent_private *entry;
1566
1567 /*
1568 * Routing is based on high 32 bits of transaction ID
1569 * of MAD.
1570 */
1571 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1572 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1573 if (entry->agent.hi_tid == hi_tid) {
1574 mad_agent = entry;
1575 break;
1576 }
1577 }
1578 } else {
1579 struct ib_mad_mgmt_class_table *class;
1580 struct ib_mad_mgmt_method_table *method;
1581 struct ib_mad_mgmt_vendor_class_table *vendor;
1582 struct ib_mad_mgmt_vendor_class *vendor_class;
1583 struct ib_vendor_mad *vendor_mad;
1584 int index;
1585
1586 /*
1587 * Routing is based on version, class, and method
1588 * For "newer" vendor MADs, also based on OUI
1589 */
1590 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1591 goto out;
1592 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1593 class = port_priv->version[
1594 mad->mad_hdr.class_version].class;
1595 if (!class)
1596 goto out;
1597 method = class->method_table[convert_mgmt_class(
1598 mad->mad_hdr.mgmt_class)];
1599 if (method)
1600 mad_agent = method->agent[mad->mad_hdr.method &
1601 ~IB_MGMT_METHOD_RESP];
1602 } else {
1603 vendor = port_priv->version[
1604 mad->mad_hdr.class_version].vendor;
1605 if (!vendor)
1606 goto out;
1607 vendor_class = vendor->vendor_class[vendor_class_index(
1608 mad->mad_hdr.mgmt_class)];
1609 if (!vendor_class)
1610 goto out;
1611 /* Find matching OUI */
1612 vendor_mad = (struct ib_vendor_mad *)mad;
1613 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1614 if (index == -1)
1615 goto out;
1616 method = vendor_class->method_table[index];
1617 if (method) {
1618 mad_agent = method->agent[mad->mad_hdr.method &
1619 ~IB_MGMT_METHOD_RESP];
1620 }
1621 }
1622 }
1623
1624 if (mad_agent) {
1625 if (mad_agent->agent.recv_handler)
1626 atomic_inc(&mad_agent->refcount);
1627 else {
1628 printk(KERN_NOTICE PFX "No receive handler for client "
1629 "%p on port %d\n",
1630 &mad_agent->agent, port_priv->port_num);
1631 mad_agent = NULL;
1632 }
1633 }
1634 out:
1635 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1636
1637 return mad_agent;
1638 }
1639
1640 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1641 {
1642 int valid = 0;
1643
1644 /* Make sure MAD base version is understood */
1645 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1646 printk(KERN_ERR PFX "MAD received with unsupported base "
1647 "version %d\n", mad->mad_hdr.base_version);
1648 goto out;
1649 }
1650
1651 /* Filter SMI packets sent to other than QP0 */
1652 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1653 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1654 if (qp_num == 0)
1655 valid = 1;
1656 } else {
1657 /* Filter GSI packets sent to QP0 */
1658 if (qp_num != 0)
1659 valid = 1;
1660 }
1661
1662 out:
1663 return valid;
1664 }
1665
1666 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1667 struct ib_mad_hdr *mad_hdr)
1668 {
1669 struct ib_rmpp_mad *rmpp_mad;
1670
1671 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1672 return !mad_agent_priv->agent.rmpp_version ||
1673 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1674 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1675 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1676 }
1677
1678 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1679 struct ib_mad_recv_wc *rwc)
1680 {
1681 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1682 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1683 }
1684
1685 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1686 struct ib_mad_send_wr_private *wr,
1687 struct ib_mad_recv_wc *rwc )
1688 {
1689 struct ib_ah_attr attr;
1690 u8 send_resp, rcv_resp;
1691 union ib_gid sgid;
1692 struct ib_device *device = mad_agent_priv->agent.device;
1693 u8 port_num = mad_agent_priv->agent.port_num;
1694 u8 lmc;
1695
1696 send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1697 mad_hdr.method & IB_MGMT_METHOD_RESP;
1698 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1699
1700 if (send_resp == rcv_resp)
1701 /* both requests, or both responses. GIDs different */
1702 return 0;
1703
1704 if (ib_query_ah(wr->send_buf.ah, &attr))
1705 /* Assume not equal, to avoid false positives. */
1706 return 0;
1707
1708 if (!!(attr.ah_flags & IB_AH_GRH) !=
1709 !!(rwc->wc->wc_flags & IB_WC_GRH))
1710 /* one has GID, other does not. Assume different */
1711 return 0;
1712
1713 if (!send_resp && rcv_resp) {
1714 /* is request/response. */
1715 if (!(attr.ah_flags & IB_AH_GRH)) {
1716 if (ib_get_cached_lmc(device, port_num, &lmc))
1717 return 0;
1718 return (!lmc || !((attr.src_path_bits ^
1719 rwc->wc->dlid_path_bits) &
1720 ((1 << lmc) - 1)));
1721 } else {
1722 if (ib_get_cached_gid(device, port_num,
1723 attr.grh.sgid_index, &sgid))
1724 return 0;
1725 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1726 16);
1727 }
1728 }
1729
1730 if (!(attr.ah_flags & IB_AH_GRH))
1731 return attr.dlid == rwc->wc->slid;
1732 else
1733 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1734 16);
1735 }
1736
1737 static inline int is_direct(u8 class)
1738 {
1739 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1740 }
1741
1742 struct ib_mad_send_wr_private*
1743 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1744 struct ib_mad_recv_wc *wc)
1745 {
1746 struct ib_mad_send_wr_private *wr;
1747 struct ib_mad *mad;
1748
1749 mad = (struct ib_mad *)wc->recv_buf.mad;
1750
1751 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1752 if ((wr->tid == mad->mad_hdr.tid) &&
1753 rcv_has_same_class(wr, wc) &&
1754 /*
1755 * Don't check GID for direct routed MADs.
1756 * These might have permissive LIDs.
1757 */
1758 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1759 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1760 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1761 }
1762
1763 /*
1764 * It's possible to receive the response before we've
1765 * been notified that the send has completed
1766 */
1767 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1768 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1769 wr->tid == mad->mad_hdr.tid &&
1770 wr->timeout &&
1771 rcv_has_same_class(wr, wc) &&
1772 /*
1773 * Don't check GID for direct routed MADs.
1774 * These might have permissive LIDs.
1775 */
1776 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1777 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1778 /* Verify request has not been canceled */
1779 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1780 }
1781 return NULL;
1782 }
1783
1784 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1785 {
1786 mad_send_wr->timeout = 0;
1787 if (mad_send_wr->refcount == 1)
1788 list_move_tail(&mad_send_wr->agent_list,
1789 &mad_send_wr->mad_agent_priv->done_list);
1790 }
1791
1792 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1793 struct ib_mad_recv_wc *mad_recv_wc)
1794 {
1795 struct ib_mad_send_wr_private *mad_send_wr;
1796 struct ib_mad_send_wc mad_send_wc;
1797 unsigned long flags;
1798
1799 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1800 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1801 if (mad_agent_priv->agent.rmpp_version) {
1802 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1803 mad_recv_wc);
1804 if (!mad_recv_wc) {
1805 deref_mad_agent(mad_agent_priv);
1806 return;
1807 }
1808 }
1809
1810 /* Complete corresponding request */
1811 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1812 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1813 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1814 if (!mad_send_wr) {
1815 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1816 ib_free_recv_mad(mad_recv_wc);
1817 deref_mad_agent(mad_agent_priv);
1818 return;
1819 }
1820 ib_mark_mad_done(mad_send_wr);
1821 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1822
1823 /* Defined behavior is to complete response before request */
1824 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1825 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1826 mad_recv_wc);
1827 atomic_dec(&mad_agent_priv->refcount);
1828
1829 mad_send_wc.status = IB_WC_SUCCESS;
1830 mad_send_wc.vendor_err = 0;
1831 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1832 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1833 } else {
1834 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1835 mad_recv_wc);
1836 deref_mad_agent(mad_agent_priv);
1837 }
1838 }
1839
1840 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1841 struct ib_wc *wc)
1842 {
1843 struct ib_mad_qp_info *qp_info;
1844 struct ib_mad_private_header *mad_priv_hdr;
1845 struct ib_mad_private *recv, *response = NULL;
1846 struct ib_mad_list_head *mad_list;
1847 struct ib_mad_agent_private *mad_agent;
1848 int port_num;
1849
1850 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1851 qp_info = mad_list->mad_queue->qp_info;
1852 dequeue_mad(mad_list);
1853
1854 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1855 mad_list);
1856 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1857 ib_dma_unmap_single(port_priv->device,
1858 recv->header.mapping,
1859 sizeof(struct ib_mad_private) -
1860 sizeof(struct ib_mad_private_header),
1861 DMA_FROM_DEVICE);
1862
1863 /* Setup MAD receive work completion from "normal" work completion */
1864 recv->header.wc = *wc;
1865 recv->header.recv_wc.wc = &recv->header.wc;
1866 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1867 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1868 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1869
1870 if (atomic_read(&qp_info->snoop_count))
1871 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1872
1873 /* Validate MAD */
1874 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1875 goto out;
1876
1877 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1878 if (!response) {
1879 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1880 "for response buffer\n");
1881 goto out;
1882 }
1883
1884 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1885 port_num = wc->port_num;
1886 else
1887 port_num = port_priv->port_num;
1888
1889 if (recv->mad.mad.mad_hdr.mgmt_class ==
1890 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1891 enum smi_forward_action retsmi;
1892
1893 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1894 port_priv->device->node_type,
1895 port_num,
1896 port_priv->device->phys_port_cnt) ==
1897 IB_SMI_DISCARD)
1898 goto out;
1899
1900 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1901 if (retsmi == IB_SMI_LOCAL)
1902 goto local;
1903
1904 if (retsmi == IB_SMI_SEND) { /* don't forward */
1905 if (smi_handle_dr_smp_send(&recv->mad.smp,
1906 port_priv->device->node_type,
1907 port_num) == IB_SMI_DISCARD)
1908 goto out;
1909
1910 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1911 goto out;
1912 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1913 /* forward case for switches */
1914 memcpy(response, recv, sizeof(*response));
1915 response->header.recv_wc.wc = &response->header.wc;
1916 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1917 response->header.recv_wc.recv_buf.grh = &response->grh;
1918
1919 agent_send_response(&response->mad.mad,
1920 &response->grh, wc,
1921 port_priv->device,
1922 smi_get_fwd_port(&recv->mad.smp),
1923 qp_info->qp->qp_num);
1924
1925 goto out;
1926 }
1927 }
1928
1929 local:
1930 /* Give driver "right of first refusal" on incoming MAD */
1931 if (port_priv->device->process_mad) {
1932 int ret;
1933
1934 if (!response) {
1935 printk(KERN_ERR PFX "No memory for response MAD\n");
1936 /*
1937 * Is it better to assume that
1938 * it wouldn't be processed ?
1939 */
1940 goto out;
1941 }
1942
1943 ret = port_priv->device->process_mad(port_priv->device, 0,
1944 port_priv->port_num,
1945 wc, &recv->grh,
1946 &recv->mad.mad,
1947 &response->mad.mad);
1948 if (ret & IB_MAD_RESULT_SUCCESS) {
1949 if (ret & IB_MAD_RESULT_CONSUMED)
1950 goto out;
1951 if (ret & IB_MAD_RESULT_REPLY) {
1952 agent_send_response(&response->mad.mad,
1953 &recv->grh, wc,
1954 port_priv->device,
1955 port_num,
1956 qp_info->qp->qp_num);
1957 goto out;
1958 }
1959 }
1960 }
1961
1962 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1963 if (mad_agent) {
1964 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1965 /*
1966 * recv is freed up in error cases in ib_mad_complete_recv
1967 * or via recv_handler in ib_mad_complete_recv()
1968 */
1969 recv = NULL;
1970 }
1971
1972 out:
1973 /* Post another receive request for this QP */
1974 if (response) {
1975 ib_mad_post_receive_mads(qp_info, response);
1976 if (recv)
1977 kmem_cache_free(ib_mad_cache, recv);
1978 } else
1979 ib_mad_post_receive_mads(qp_info, recv);
1980 }
1981
1982 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1983 {
1984 struct ib_mad_send_wr_private *mad_send_wr;
1985 unsigned long delay;
1986
1987 if (list_empty(&mad_agent_priv->wait_list)) {
1988 cancel_delayed_work(&mad_agent_priv->timed_work);
1989 } else {
1990 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1991 struct ib_mad_send_wr_private,
1992 agent_list);
1993
1994 if (time_after(mad_agent_priv->timeout,
1995 mad_send_wr->timeout)) {
1996 mad_agent_priv->timeout = mad_send_wr->timeout;
1997 cancel_delayed_work(&mad_agent_priv->timed_work);
1998 delay = mad_send_wr->timeout - jiffies;
1999 if ((long)delay <= 0)
2000 delay = 1;
2001 queue_delayed_work(mad_agent_priv->qp_info->
2002 port_priv->wq,
2003 &mad_agent_priv->timed_work, delay);
2004 }
2005 }
2006 }
2007
2008 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2009 {
2010 struct ib_mad_agent_private *mad_agent_priv;
2011 struct ib_mad_send_wr_private *temp_mad_send_wr;
2012 struct list_head *list_item;
2013 unsigned long delay;
2014
2015 mad_agent_priv = mad_send_wr->mad_agent_priv;
2016 list_del(&mad_send_wr->agent_list);
2017
2018 delay = mad_send_wr->timeout;
2019 mad_send_wr->timeout += jiffies;
2020
2021 if (delay) {
2022 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2023 temp_mad_send_wr = list_entry(list_item,
2024 struct ib_mad_send_wr_private,
2025 agent_list);
2026 if (time_after(mad_send_wr->timeout,
2027 temp_mad_send_wr->timeout))
2028 break;
2029 }
2030 }
2031 else
2032 list_item = &mad_agent_priv->wait_list;
2033 list_add(&mad_send_wr->agent_list, list_item);
2034
2035 /* Reschedule a work item if we have a shorter timeout */
2036 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2037 cancel_delayed_work(&mad_agent_priv->timed_work);
2038 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2039 &mad_agent_priv->timed_work, delay);
2040 }
2041 }
2042
2043 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2044 int timeout_ms)
2045 {
2046 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2047 wait_for_response(mad_send_wr);
2048 }
2049
2050 /*
2051 * Process a send work completion
2052 */
2053 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2054 struct ib_mad_send_wc *mad_send_wc)
2055 {
2056 struct ib_mad_agent_private *mad_agent_priv;
2057 unsigned long flags;
2058 int ret;
2059
2060 mad_agent_priv = mad_send_wr->mad_agent_priv;
2061 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2062 if (mad_agent_priv->agent.rmpp_version) {
2063 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2064 if (ret == IB_RMPP_RESULT_CONSUMED)
2065 goto done;
2066 } else
2067 ret = IB_RMPP_RESULT_UNHANDLED;
2068
2069 if (mad_send_wc->status != IB_WC_SUCCESS &&
2070 mad_send_wr->status == IB_WC_SUCCESS) {
2071 mad_send_wr->status = mad_send_wc->status;
2072 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2073 }
2074
2075 if (--mad_send_wr->refcount > 0) {
2076 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2077 mad_send_wr->status == IB_WC_SUCCESS) {
2078 wait_for_response(mad_send_wr);
2079 }
2080 goto done;
2081 }
2082
2083 /* Remove send from MAD agent and notify client of completion */
2084 list_del(&mad_send_wr->agent_list);
2085 adjust_timeout(mad_agent_priv);
2086 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2087
2088 if (mad_send_wr->status != IB_WC_SUCCESS )
2089 mad_send_wc->status = mad_send_wr->status;
2090 if (ret == IB_RMPP_RESULT_INTERNAL)
2091 ib_rmpp_send_handler(mad_send_wc);
2092 else
2093 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2094 mad_send_wc);
2095
2096 /* Release reference on agent taken when sending */
2097 deref_mad_agent(mad_agent_priv);
2098 return;
2099 done:
2100 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2101 }
2102
2103 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2104 struct ib_wc *wc)
2105 {
2106 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2107 struct ib_mad_list_head *mad_list;
2108 struct ib_mad_qp_info *qp_info;
2109 struct ib_mad_queue *send_queue;
2110 struct ib_send_wr *bad_send_wr;
2111 struct ib_mad_send_wc mad_send_wc;
2112 unsigned long flags;
2113 int ret;
2114
2115 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2116 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2117 mad_list);
2118 send_queue = mad_list->mad_queue;
2119 qp_info = send_queue->qp_info;
2120
2121 retry:
2122 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2123 mad_send_wr->header_mapping,
2124 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2125 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2126 mad_send_wr->payload_mapping,
2127 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2128 queued_send_wr = NULL;
2129 spin_lock_irqsave(&send_queue->lock, flags);
2130 list_del(&mad_list->list);
2131
2132 /* Move queued send to the send queue */
2133 if (send_queue->count-- > send_queue->max_active) {
2134 mad_list = container_of(qp_info->overflow_list.next,
2135 struct ib_mad_list_head, list);
2136 queued_send_wr = container_of(mad_list,
2137 struct ib_mad_send_wr_private,
2138 mad_list);
2139 list_move_tail(&mad_list->list, &send_queue->list);
2140 }
2141 spin_unlock_irqrestore(&send_queue->lock, flags);
2142
2143 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2144 mad_send_wc.status = wc->status;
2145 mad_send_wc.vendor_err = wc->vendor_err;
2146 if (atomic_read(&qp_info->snoop_count))
2147 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2148 IB_MAD_SNOOP_SEND_COMPLETIONS);
2149 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2150
2151 if (queued_send_wr) {
2152 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2153 &bad_send_wr);
2154 if (ret) {
2155 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2156 mad_send_wr = queued_send_wr;
2157 wc->status = IB_WC_LOC_QP_OP_ERR;
2158 goto retry;
2159 }
2160 }
2161 }
2162
2163 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2164 {
2165 struct ib_mad_send_wr_private *mad_send_wr;
2166 struct ib_mad_list_head *mad_list;
2167 unsigned long flags;
2168
2169 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2170 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2171 mad_send_wr = container_of(mad_list,
2172 struct ib_mad_send_wr_private,
2173 mad_list);
2174 mad_send_wr->retry = 1;
2175 }
2176 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2177 }
2178
2179 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2180 struct ib_wc *wc)
2181 {
2182 struct ib_mad_list_head *mad_list;
2183 struct ib_mad_qp_info *qp_info;
2184 struct ib_mad_send_wr_private *mad_send_wr;
2185 int ret;
2186
2187 /* Determine if failure was a send or receive */
2188 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2189 qp_info = mad_list->mad_queue->qp_info;
2190 if (mad_list->mad_queue == &qp_info->recv_queue)
2191 /*
2192 * Receive errors indicate that the QP has entered the error
2193 * state - error handling/shutdown code will cleanup
2194 */
2195 return;
2196
2197 /*
2198 * Send errors will transition the QP to SQE - move
2199 * QP to RTS and repost flushed work requests
2200 */
2201 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2202 mad_list);
2203 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2204 if (mad_send_wr->retry) {
2205 /* Repost send */
2206 struct ib_send_wr *bad_send_wr;
2207
2208 mad_send_wr->retry = 0;
2209 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2210 &bad_send_wr);
2211 if (ret)
2212 ib_mad_send_done_handler(port_priv, wc);
2213 } else
2214 ib_mad_send_done_handler(port_priv, wc);
2215 } else {
2216 struct ib_qp_attr *attr;
2217
2218 /* Transition QP to RTS and fail offending send */
2219 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2220 if (attr) {
2221 attr->qp_state = IB_QPS_RTS;
2222 attr->cur_qp_state = IB_QPS_SQE;
2223 ret = ib_modify_qp(qp_info->qp, attr,
2224 IB_QP_STATE | IB_QP_CUR_STATE);
2225 kfree(attr);
2226 if (ret)
2227 printk(KERN_ERR PFX "mad_error_handler - "
2228 "ib_modify_qp to RTS : %d\n", ret);
2229 else
2230 mark_sends_for_retry(qp_info);
2231 }
2232 ib_mad_send_done_handler(port_priv, wc);
2233 }
2234 }
2235
2236 /*
2237 * IB MAD completion callback
2238 */
2239 static void ib_mad_completion_handler(struct work_struct *work)
2240 {
2241 struct ib_mad_port_private *port_priv;
2242 struct ib_wc wc;
2243
2244 port_priv = container_of(work, struct ib_mad_port_private, work);
2245 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2246
2247 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2248 if (wc.status == IB_WC_SUCCESS) {
2249 switch (wc.opcode) {
2250 case IB_WC_SEND:
2251 ib_mad_send_done_handler(port_priv, &wc);
2252 break;
2253 case IB_WC_RECV:
2254 ib_mad_recv_done_handler(port_priv, &wc);
2255 break;
2256 default:
2257 BUG_ON(1);
2258 break;
2259 }
2260 } else
2261 mad_error_handler(port_priv, &wc);
2262 }
2263 }
2264
2265 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2266 {
2267 unsigned long flags;
2268 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2269 struct ib_mad_send_wc mad_send_wc;
2270 struct list_head cancel_list;
2271
2272 INIT_LIST_HEAD(&cancel_list);
2273
2274 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2275 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2276 &mad_agent_priv->send_list, agent_list) {
2277 if (mad_send_wr->status == IB_WC_SUCCESS) {
2278 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2279 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2280 }
2281 }
2282
2283 /* Empty wait list to prevent receives from finding a request */
2284 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2285 /* Empty local completion list as well */
2286 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2287 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2288
2289 /* Report all cancelled requests */
2290 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2291 mad_send_wc.vendor_err = 0;
2292
2293 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2294 &cancel_list, agent_list) {
2295 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2296 list_del(&mad_send_wr->agent_list);
2297 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2298 &mad_send_wc);
2299 atomic_dec(&mad_agent_priv->refcount);
2300 }
2301 }
2302
2303 static struct ib_mad_send_wr_private*
2304 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2305 struct ib_mad_send_buf *send_buf)
2306 {
2307 struct ib_mad_send_wr_private *mad_send_wr;
2308
2309 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2310 agent_list) {
2311 if (&mad_send_wr->send_buf == send_buf)
2312 return mad_send_wr;
2313 }
2314
2315 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2316 agent_list) {
2317 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2318 &mad_send_wr->send_buf == send_buf)
2319 return mad_send_wr;
2320 }
2321 return NULL;
2322 }
2323
2324 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2325 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2326 {
2327 struct ib_mad_agent_private *mad_agent_priv;
2328 struct ib_mad_send_wr_private *mad_send_wr;
2329 unsigned long flags;
2330 int active;
2331
2332 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2333 agent);
2334 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2335 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2336 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2337 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2338 return -EINVAL;
2339 }
2340
2341 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2342 if (!timeout_ms) {
2343 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2344 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2345 }
2346
2347 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2348 if (active)
2349 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2350 else
2351 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2352
2353 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2354 return 0;
2355 }
2356 EXPORT_SYMBOL(ib_modify_mad);
2357
2358 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2359 struct ib_mad_send_buf *send_buf)
2360 {
2361 ib_modify_mad(mad_agent, send_buf, 0);
2362 }
2363 EXPORT_SYMBOL(ib_cancel_mad);
2364
2365 static void local_completions(struct work_struct *work)
2366 {
2367 struct ib_mad_agent_private *mad_agent_priv;
2368 struct ib_mad_local_private *local;
2369 struct ib_mad_agent_private *recv_mad_agent;
2370 unsigned long flags;
2371 int recv = 0;
2372 struct ib_wc wc;
2373 struct ib_mad_send_wc mad_send_wc;
2374
2375 mad_agent_priv =
2376 container_of(work, struct ib_mad_agent_private, local_work);
2377
2378 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2379 while (!list_empty(&mad_agent_priv->local_list)) {
2380 local = list_entry(mad_agent_priv->local_list.next,
2381 struct ib_mad_local_private,
2382 completion_list);
2383 list_del(&local->completion_list);
2384 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2385 if (local->mad_priv) {
2386 recv_mad_agent = local->recv_mad_agent;
2387 if (!recv_mad_agent) {
2388 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2389 goto local_send_completion;
2390 }
2391
2392 recv = 1;
2393 /*
2394 * Defined behavior is to complete response
2395 * before request
2396 */
2397 build_smp_wc(recv_mad_agent->agent.qp,
2398 (unsigned long) local->mad_send_wr,
2399 be16_to_cpu(IB_LID_PERMISSIVE),
2400 0, recv_mad_agent->agent.port_num, &wc);
2401
2402 local->mad_priv->header.recv_wc.wc = &wc;
2403 local->mad_priv->header.recv_wc.mad_len =
2404 sizeof(struct ib_mad);
2405 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2406 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2407 &local->mad_priv->header.recv_wc.rmpp_list);
2408 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2409 local->mad_priv->header.recv_wc.recv_buf.mad =
2410 &local->mad_priv->mad.mad;
2411 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2412 snoop_recv(recv_mad_agent->qp_info,
2413 &local->mad_priv->header.recv_wc,
2414 IB_MAD_SNOOP_RECVS);
2415 recv_mad_agent->agent.recv_handler(
2416 &recv_mad_agent->agent,
2417 &local->mad_priv->header.recv_wc);
2418 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2419 atomic_dec(&recv_mad_agent->refcount);
2420 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2421 }
2422
2423 local_send_completion:
2424 /* Complete send */
2425 mad_send_wc.status = IB_WC_SUCCESS;
2426 mad_send_wc.vendor_err = 0;
2427 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2428 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2429 snoop_send(mad_agent_priv->qp_info,
2430 &local->mad_send_wr->send_buf,
2431 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2432 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2433 &mad_send_wc);
2434
2435 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2436 atomic_dec(&mad_agent_priv->refcount);
2437 if (!recv)
2438 kmem_cache_free(ib_mad_cache, local->mad_priv);
2439 kfree(local);
2440 }
2441 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2442 }
2443
2444 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2445 {
2446 int ret;
2447
2448 if (!mad_send_wr->retries--)
2449 return -ETIMEDOUT;
2450
2451 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2452
2453 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2454 ret = ib_retry_rmpp(mad_send_wr);
2455 switch (ret) {
2456 case IB_RMPP_RESULT_UNHANDLED:
2457 ret = ib_send_mad(mad_send_wr);
2458 break;
2459 case IB_RMPP_RESULT_CONSUMED:
2460 ret = 0;
2461 break;
2462 default:
2463 ret = -ECOMM;
2464 break;
2465 }
2466 } else
2467 ret = ib_send_mad(mad_send_wr);
2468
2469 if (!ret) {
2470 mad_send_wr->refcount++;
2471 list_add_tail(&mad_send_wr->agent_list,
2472 &mad_send_wr->mad_agent_priv->send_list);
2473 }
2474 return ret;
2475 }
2476
2477 static void timeout_sends(struct work_struct *work)
2478 {
2479 struct ib_mad_agent_private *mad_agent_priv;
2480 struct ib_mad_send_wr_private *mad_send_wr;
2481 struct ib_mad_send_wc mad_send_wc;
2482 unsigned long flags, delay;
2483
2484 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2485 timed_work.work);
2486 mad_send_wc.vendor_err = 0;
2487
2488 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2489 while (!list_empty(&mad_agent_priv->wait_list)) {
2490 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2491 struct ib_mad_send_wr_private,
2492 agent_list);
2493
2494 if (time_after(mad_send_wr->timeout, jiffies)) {
2495 delay = mad_send_wr->timeout - jiffies;
2496 if ((long)delay <= 0)
2497 delay = 1;
2498 queue_delayed_work(mad_agent_priv->qp_info->
2499 port_priv->wq,
2500 &mad_agent_priv->timed_work, delay);
2501 break;
2502 }
2503
2504 list_del(&mad_send_wr->agent_list);
2505 if (mad_send_wr->status == IB_WC_SUCCESS &&
2506 !retry_send(mad_send_wr))
2507 continue;
2508
2509 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2510
2511 if (mad_send_wr->status == IB_WC_SUCCESS)
2512 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2513 else
2514 mad_send_wc.status = mad_send_wr->status;
2515 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2516 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2517 &mad_send_wc);
2518
2519 atomic_dec(&mad_agent_priv->refcount);
2520 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2521 }
2522 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2523 }
2524
2525 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2526 {
2527 struct ib_mad_port_private *port_priv = cq->cq_context;
2528 unsigned long flags;
2529
2530 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2531 if (!list_empty(&port_priv->port_list))
2532 queue_work(port_priv->wq, &port_priv->work);
2533 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2534 }
2535
2536 /*
2537 * Allocate receive MADs and post receive WRs for them
2538 */
2539 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2540 struct ib_mad_private *mad)
2541 {
2542 unsigned long flags;
2543 int post, ret;
2544 struct ib_mad_private *mad_priv;
2545 struct ib_sge sg_list;
2546 struct ib_recv_wr recv_wr, *bad_recv_wr;
2547 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2548
2549 /* Initialize common scatter list fields */
2550 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2551 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2552
2553 /* Initialize common receive WR fields */
2554 recv_wr.next = NULL;
2555 recv_wr.sg_list = &sg_list;
2556 recv_wr.num_sge = 1;
2557
2558 do {
2559 /* Allocate and map receive buffer */
2560 if (mad) {
2561 mad_priv = mad;
2562 mad = NULL;
2563 } else {
2564 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2565 if (!mad_priv) {
2566 printk(KERN_ERR PFX "No memory for receive buffer\n");
2567 ret = -ENOMEM;
2568 break;
2569 }
2570 }
2571 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2572 &mad_priv->grh,
2573 sizeof *mad_priv -
2574 sizeof mad_priv->header,
2575 DMA_FROM_DEVICE);
2576 mad_priv->header.mapping = sg_list.addr;
2577 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2578 mad_priv->header.mad_list.mad_queue = recv_queue;
2579
2580 /* Post receive WR */
2581 spin_lock_irqsave(&recv_queue->lock, flags);
2582 post = (++recv_queue->count < recv_queue->max_active);
2583 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2584 spin_unlock_irqrestore(&recv_queue->lock, flags);
2585 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2586 if (ret) {
2587 spin_lock_irqsave(&recv_queue->lock, flags);
2588 list_del(&mad_priv->header.mad_list.list);
2589 recv_queue->count--;
2590 spin_unlock_irqrestore(&recv_queue->lock, flags);
2591 ib_dma_unmap_single(qp_info->port_priv->device,
2592 mad_priv->header.mapping,
2593 sizeof *mad_priv -
2594 sizeof mad_priv->header,
2595 DMA_FROM_DEVICE);
2596 kmem_cache_free(ib_mad_cache, mad_priv);
2597 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2598 break;
2599 }
2600 } while (post);
2601
2602 return ret;
2603 }
2604
2605 /*
2606 * Return all the posted receive MADs
2607 */
2608 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2609 {
2610 struct ib_mad_private_header *mad_priv_hdr;
2611 struct ib_mad_private *recv;
2612 struct ib_mad_list_head *mad_list;
2613
2614 while (!list_empty(&qp_info->recv_queue.list)) {
2615
2616 mad_list = list_entry(qp_info->recv_queue.list.next,
2617 struct ib_mad_list_head, list);
2618 mad_priv_hdr = container_of(mad_list,
2619 struct ib_mad_private_header,
2620 mad_list);
2621 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2622 header);
2623
2624 /* Remove from posted receive MAD list */
2625 list_del(&mad_list->list);
2626
2627 ib_dma_unmap_single(qp_info->port_priv->device,
2628 recv->header.mapping,
2629 sizeof(struct ib_mad_private) -
2630 sizeof(struct ib_mad_private_header),
2631 DMA_FROM_DEVICE);
2632 kmem_cache_free(ib_mad_cache, recv);
2633 }
2634
2635 qp_info->recv_queue.count = 0;
2636 }
2637
2638 /*
2639 * Start the port
2640 */
2641 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2642 {
2643 int ret, i;
2644 struct ib_qp_attr *attr;
2645 struct ib_qp *qp;
2646
2647 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2648 if (!attr) {
2649 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2650 return -ENOMEM;
2651 }
2652
2653 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2654 qp = port_priv->qp_info[i].qp;
2655 /*
2656 * PKey index for QP1 is irrelevant but
2657 * one is needed for the Reset to Init transition
2658 */
2659 attr->qp_state = IB_QPS_INIT;
2660 attr->pkey_index = 0;
2661 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2663 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2664 if (ret) {
2665 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2666 "INIT: %d\n", i, ret);
2667 goto out;
2668 }
2669
2670 attr->qp_state = IB_QPS_RTR;
2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2672 if (ret) {
2673 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674 "RTR: %d\n", i, ret);
2675 goto out;
2676 }
2677
2678 attr->qp_state = IB_QPS_RTS;
2679 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2680 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2681 if (ret) {
2682 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2683 "RTS: %d\n", i, ret);
2684 goto out;
2685 }
2686 }
2687
2688 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2689 if (ret) {
2690 printk(KERN_ERR PFX "Failed to request completion "
2691 "notification: %d\n", ret);
2692 goto out;
2693 }
2694
2695 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2696 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2697 if (ret) {
2698 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2699 goto out;
2700 }
2701 }
2702 out:
2703 kfree(attr);
2704 return ret;
2705 }
2706
2707 static void qp_event_handler(struct ib_event *event, void *qp_context)
2708 {
2709 struct ib_mad_qp_info *qp_info = qp_context;
2710
2711 /* It's worse than that! He's dead, Jim! */
2712 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2713 event->event, qp_info->qp->qp_num);
2714 }
2715
2716 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2717 struct ib_mad_queue *mad_queue)
2718 {
2719 mad_queue->qp_info = qp_info;
2720 mad_queue->count = 0;
2721 spin_lock_init(&mad_queue->lock);
2722 INIT_LIST_HEAD(&mad_queue->list);
2723 }
2724
2725 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2726 struct ib_mad_qp_info *qp_info)
2727 {
2728 qp_info->port_priv = port_priv;
2729 init_mad_queue(qp_info, &qp_info->send_queue);
2730 init_mad_queue(qp_info, &qp_info->recv_queue);
2731 INIT_LIST_HEAD(&qp_info->overflow_list);
2732 spin_lock_init(&qp_info->snoop_lock);
2733 qp_info->snoop_table = NULL;
2734 qp_info->snoop_table_size = 0;
2735 atomic_set(&qp_info->snoop_count, 0);
2736 }
2737
2738 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2739 enum ib_qp_type qp_type)
2740 {
2741 struct ib_qp_init_attr qp_init_attr;
2742 int ret;
2743
2744 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2745 qp_init_attr.send_cq = qp_info->port_priv->cq;
2746 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2747 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2748 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2749 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2750 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2751 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2752 qp_init_attr.qp_type = qp_type;
2753 qp_init_attr.port_num = qp_info->port_priv->port_num;
2754 qp_init_attr.qp_context = qp_info;
2755 qp_init_attr.event_handler = qp_event_handler;
2756 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2757 if (IS_ERR(qp_info->qp)) {
2758 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2759 get_spl_qp_index(qp_type));
2760 ret = PTR_ERR(qp_info->qp);
2761 goto error;
2762 }
2763 /* Use minimum queue sizes unless the CQ is resized */
2764 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2765 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2766 return 0;
2767
2768 error:
2769 return ret;
2770 }
2771
2772 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2773 {
2774 ib_destroy_qp(qp_info->qp);
2775 kfree(qp_info->snoop_table);
2776 }
2777
2778 /*
2779 * Open the port
2780 * Create the QP, PD, MR, and CQ if needed
2781 */
2782 static int ib_mad_port_open(struct ib_device *device,
2783 int port_num)
2784 {
2785 int ret, cq_size;
2786 struct ib_mad_port_private *port_priv;
2787 unsigned long flags;
2788 char name[sizeof "ib_mad123"];
2789
2790 /* Create new device info */
2791 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2792 if (!port_priv) {
2793 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2794 return -ENOMEM;
2795 }
2796
2797 port_priv->device = device;
2798 port_priv->port_num = port_num;
2799 spin_lock_init(&port_priv->reg_lock);
2800 INIT_LIST_HEAD(&port_priv->agent_list);
2801 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2802 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2803
2804 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2805 port_priv->cq = ib_create_cq(port_priv->device,
2806 ib_mad_thread_completion_handler,
2807 NULL, port_priv, cq_size, 0);
2808 if (IS_ERR(port_priv->cq)) {
2809 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2810 ret = PTR_ERR(port_priv->cq);
2811 goto error3;
2812 }
2813
2814 port_priv->pd = ib_alloc_pd(device);
2815 if (IS_ERR(port_priv->pd)) {
2816 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2817 ret = PTR_ERR(port_priv->pd);
2818 goto error4;
2819 }
2820
2821 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2822 if (IS_ERR(port_priv->mr)) {
2823 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2824 ret = PTR_ERR(port_priv->mr);
2825 goto error5;
2826 }
2827
2828 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2829 if (ret)
2830 goto error6;
2831 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2832 if (ret)
2833 goto error7;
2834
2835 snprintf(name, sizeof name, "ib_mad%d", port_num);
2836 port_priv->wq = create_singlethread_workqueue(name);
2837 if (!port_priv->wq) {
2838 ret = -ENOMEM;
2839 goto error8;
2840 }
2841 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2842
2843 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2844 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2845 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2846
2847 ret = ib_mad_port_start(port_priv);
2848 if (ret) {
2849 printk(KERN_ERR PFX "Couldn't start port\n");
2850 goto error9;
2851 }
2852
2853 return 0;
2854
2855 error9:
2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2857 list_del_init(&port_priv->port_list);
2858 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2859
2860 destroy_workqueue(port_priv->wq);
2861 error8:
2862 destroy_mad_qp(&port_priv->qp_info[1]);
2863 error7:
2864 destroy_mad_qp(&port_priv->qp_info[0]);
2865 error6:
2866 ib_dereg_mr(port_priv->mr);
2867 error5:
2868 ib_dealloc_pd(port_priv->pd);
2869 error4:
2870 ib_destroy_cq(port_priv->cq);
2871 cleanup_recv_queue(&port_priv->qp_info[1]);
2872 cleanup_recv_queue(&port_priv->qp_info[0]);
2873 error3:
2874 kfree(port_priv);
2875
2876 return ret;
2877 }
2878
2879 /*
2880 * Close the port
2881 * If there are no classes using the port, free the port
2882 * resources (CQ, MR, PD, QP) and remove the port's info structure
2883 */
2884 static int ib_mad_port_close(struct ib_device *device, int port_num)
2885 {
2886 struct ib_mad_port_private *port_priv;
2887 unsigned long flags;
2888
2889 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2890 port_priv = __ib_get_mad_port(device, port_num);
2891 if (port_priv == NULL) {
2892 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2893 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2894 return -ENODEV;
2895 }
2896 list_del_init(&port_priv->port_list);
2897 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2898
2899 destroy_workqueue(port_priv->wq);
2900 destroy_mad_qp(&port_priv->qp_info[1]);
2901 destroy_mad_qp(&port_priv->qp_info[0]);
2902 ib_dereg_mr(port_priv->mr);
2903 ib_dealloc_pd(port_priv->pd);
2904 ib_destroy_cq(port_priv->cq);
2905 cleanup_recv_queue(&port_priv->qp_info[1]);
2906 cleanup_recv_queue(&port_priv->qp_info[0]);
2907 /* XXX: Handle deallocation of MAD registration tables */
2908
2909 kfree(port_priv);
2910
2911 return 0;
2912 }
2913
2914 static void ib_mad_init_device(struct ib_device *device)
2915 {
2916 int start, end, i;
2917
2918 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2919 return;
2920
2921 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2922 start = 0;
2923 end = 0;
2924 } else {
2925 start = 1;
2926 end = device->phys_port_cnt;
2927 }
2928
2929 for (i = start; i <= end; i++) {
2930 if (ib_mad_port_open(device, i)) {
2931 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2932 device->name, i);
2933 goto error;
2934 }
2935 if (ib_agent_port_open(device, i)) {
2936 printk(KERN_ERR PFX "Couldn't open %s port %d "
2937 "for agents\n",
2938 device->name, i);
2939 goto error_agent;
2940 }
2941 }
2942 return;
2943
2944 error_agent:
2945 if (ib_mad_port_close(device, i))
2946 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2947 device->name, i);
2948
2949 error:
2950 i--;
2951
2952 while (i >= start) {
2953 if (ib_agent_port_close(device, i))
2954 printk(KERN_ERR PFX "Couldn't close %s port %d "
2955 "for agents\n",
2956 device->name, i);
2957 if (ib_mad_port_close(device, i))
2958 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2959 device->name, i);
2960 i--;
2961 }
2962 }
2963
2964 static void ib_mad_remove_device(struct ib_device *device)
2965 {
2966 int i, num_ports, cur_port;
2967
2968 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2969 num_ports = 1;
2970 cur_port = 0;
2971 } else {
2972 num_ports = device->phys_port_cnt;
2973 cur_port = 1;
2974 }
2975 for (i = 0; i < num_ports; i++, cur_port++) {
2976 if (ib_agent_port_close(device, cur_port))
2977 printk(KERN_ERR PFX "Couldn't close %s port %d "
2978 "for agents\n",
2979 device->name, cur_port);
2980 if (ib_mad_port_close(device, cur_port))
2981 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2982 device->name, cur_port);
2983 }
2984 }
2985
2986 static struct ib_client mad_client = {
2987 .name = "mad",
2988 .add = ib_mad_init_device,
2989 .remove = ib_mad_remove_device
2990 };
2991
2992 static int __init ib_mad_init_module(void)
2993 {
2994 int ret;
2995
2996 spin_lock_init(&ib_mad_port_list_lock);
2997
2998 ib_mad_cache = kmem_cache_create("ib_mad",
2999 sizeof(struct ib_mad_private),
3000 0,
3001 SLAB_HWCACHE_ALIGN,
3002 NULL);
3003 if (!ib_mad_cache) {
3004 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3005 ret = -ENOMEM;
3006 goto error1;
3007 }
3008
3009 INIT_LIST_HEAD(&ib_mad_port_list);
3010
3011 if (ib_register_client(&mad_client)) {
3012 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3013 ret = -EINVAL;
3014 goto error2;
3015 }
3016
3017 return 0;
3018
3019 error2:
3020 kmem_cache_destroy(ib_mad_cache);
3021 error1:
3022 return ret;
3023 }
3024
3025 static void __exit ib_mad_cleanup_module(void)
3026 {
3027 ib_unregister_client(&mad_client);
3028 kmem_cache_destroy(ib_mad_cache);
3029 }
3030
3031 module_init(ib_mad_init_module);
3032 module_exit(ib_mad_cleanup_module);
3033
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