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ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / infiniband / core / mad.c
blobfbe16d5250a49bf587864234203aed6b43dbd494
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 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
706 goto out;
707
708 local = kmalloc(sizeof *local, GFP_ATOMIC);
709 if (!local) {
710 ret = -ENOMEM;
711 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
712 goto out;
713 }
714 local->mad_priv = NULL;
715 local->recv_mad_agent = NULL;
716 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
717 if (!mad_priv) {
718 ret = -ENOMEM;
719 printk(KERN_ERR PFX "No memory for local response MAD\n");
720 kfree(local);
721 goto out;
722 }
723
724 build_smp_wc(mad_agent_priv->agent.qp,
725 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
726 send_wr->wr.ud.pkey_index,
727 send_wr->wr.ud.port_num, &mad_wc);
728
729 /* No GRH for DR SMP */
730 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
731 (struct ib_mad *)smp,
732 (struct ib_mad *)&mad_priv->mad);
733 switch (ret)
734 {
735 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
736 if (ib_response_mad(&mad_priv->mad.mad) &&
737 mad_agent_priv->agent.recv_handler) {
738 local->mad_priv = mad_priv;
739 local->recv_mad_agent = mad_agent_priv;
740 /*
741 * Reference MAD agent until receive
742 * side of local completion handled
743 */
744 atomic_inc(&mad_agent_priv->refcount);
745 } else
746 kmem_cache_free(ib_mad_cache, mad_priv);
747 break;
748 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
749 kmem_cache_free(ib_mad_cache, mad_priv);
750 break;
751 case IB_MAD_RESULT_SUCCESS:
752 /* Treat like an incoming receive MAD */
753 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
754 mad_agent_priv->agent.port_num);
755 if (port_priv) {
756 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
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->max_retries = send_buf->retries;
1104 mad_send_wr->retries_left = send_buf->retries;
1105 send_buf->retries = 0;
1106 /* Reference for work request to QP + response */
1107 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1108 mad_send_wr->status = IB_WC_SUCCESS;
1109
1110 /* Reference MAD agent until send completes */
1111 atomic_inc(&mad_agent_priv->refcount);
1112 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1113 list_add_tail(&mad_send_wr->agent_list,
1114 &mad_agent_priv->send_list);
1115 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1116
1117 if (mad_agent_priv->agent.rmpp_version) {
1118 ret = ib_send_rmpp_mad(mad_send_wr);
1119 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1120 ret = ib_send_mad(mad_send_wr);
1121 } else
1122 ret = ib_send_mad(mad_send_wr);
1123 if (ret < 0) {
1124 /* Fail send request */
1125 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1126 list_del(&mad_send_wr->agent_list);
1127 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1128 atomic_dec(&mad_agent_priv->refcount);
1129 goto error;
1130 }
1131 }
1132 return 0;
1133 error:
1134 if (bad_send_buf)
1135 *bad_send_buf = send_buf;
1136 return ret;
1137 }
1138 EXPORT_SYMBOL(ib_post_send_mad);
1139
1140 /*
1141 * ib_free_recv_mad - Returns data buffers used to receive
1142 * a MAD to the access layer
1143 */
1144 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1145 {
1146 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1147 struct ib_mad_private_header *mad_priv_hdr;
1148 struct ib_mad_private *priv;
1149 struct list_head free_list;
1150
1151 INIT_LIST_HEAD(&free_list);
1152 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1153
1154 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1155 &free_list, list) {
1156 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1157 recv_buf);
1158 mad_priv_hdr = container_of(mad_recv_wc,
1159 struct ib_mad_private_header,
1160 recv_wc);
1161 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1162 header);
1163 kmem_cache_free(ib_mad_cache, priv);
1164 }
1165 }
1166 EXPORT_SYMBOL(ib_free_recv_mad);
1167
1168 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1169 u8 rmpp_version,
1170 ib_mad_send_handler send_handler,
1171 ib_mad_recv_handler recv_handler,
1172 void *context)
1173 {
1174 return ERR_PTR(-EINVAL); /* XXX: for now */
1175 }
1176 EXPORT_SYMBOL(ib_redirect_mad_qp);
1177
1178 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1179 struct ib_wc *wc)
1180 {
1181 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1182 return 0;
1183 }
1184 EXPORT_SYMBOL(ib_process_mad_wc);
1185
1186 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1187 struct ib_mad_reg_req *mad_reg_req)
1188 {
1189 int i;
1190
1191 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1192 i < IB_MGMT_MAX_METHODS;
1193 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1194 1+i)) {
1195 if ((*method)->agent[i]) {
1196 printk(KERN_ERR PFX "Method %d already in use\n", i);
1197 return -EINVAL;
1198 }
1199 }
1200 return 0;
1201 }
1202
1203 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1204 {
1205 /* Allocate management method table */
1206 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1207 if (!*method) {
1208 printk(KERN_ERR PFX "No memory for "
1209 "ib_mad_mgmt_method_table\n");
1210 return -ENOMEM;
1211 }
1212
1213 return 0;
1214 }
1215
1216 /*
1217 * Check to see if there are any methods still in use
1218 */
1219 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1220 {
1221 int i;
1222
1223 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1224 if (method->agent[i])
1225 return 1;
1226 return 0;
1227 }
1228
1229 /*
1230 * Check to see if there are any method tables for this class still in use
1231 */
1232 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1233 {
1234 int i;
1235
1236 for (i = 0; i < MAX_MGMT_CLASS; i++)
1237 if (class->method_table[i])
1238 return 1;
1239 return 0;
1240 }
1241
1242 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1243 {
1244 int i;
1245
1246 for (i = 0; i < MAX_MGMT_OUI; i++)
1247 if (vendor_class->method_table[i])
1248 return 1;
1249 return 0;
1250 }
1251
1252 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1253 char *oui)
1254 {
1255 int i;
1256
1257 for (i = 0; i < MAX_MGMT_OUI; i++)
1258 /* Is there matching OUI for this vendor class ? */
1259 if (!memcmp(vendor_class->oui[i], oui, 3))
1260 return i;
1261
1262 return -1;
1263 }
1264
1265 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1266 {
1267 int i;
1268
1269 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1270 if (vendor->vendor_class[i])
1271 return 1;
1272
1273 return 0;
1274 }
1275
1276 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1277 struct ib_mad_agent_private *agent)
1278 {
1279 int i;
1280
1281 /* Remove any methods for this mad agent */
1282 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1283 if (method->agent[i] == agent) {
1284 method->agent[i] = NULL;
1285 }
1286 }
1287 }
1288
1289 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1290 struct ib_mad_agent_private *agent_priv,
1291 u8 mgmt_class)
1292 {
1293 struct ib_mad_port_private *port_priv;
1294 struct ib_mad_mgmt_class_table **class;
1295 struct ib_mad_mgmt_method_table **method;
1296 int i, ret;
1297
1298 port_priv = agent_priv->qp_info->port_priv;
1299 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1300 if (!*class) {
1301 /* Allocate management class table for "new" class version */
1302 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1303 if (!*class) {
1304 printk(KERN_ERR PFX "No memory for "
1305 "ib_mad_mgmt_class_table\n");
1306 ret = -ENOMEM;
1307 goto error1;
1308 }
1309
1310 /* Allocate method table for this management class */
1311 method = &(*class)->method_table[mgmt_class];
1312 if ((ret = allocate_method_table(method)))
1313 goto error2;
1314 } else {
1315 method = &(*class)->method_table[mgmt_class];
1316 if (!*method) {
1317 /* Allocate method table for this management class */
1318 if ((ret = allocate_method_table(method)))
1319 goto error1;
1320 }
1321 }
1322
1323 /* Now, make sure methods are not already in use */
1324 if (method_in_use(method, mad_reg_req))
1325 goto error3;
1326
1327 /* Finally, add in methods being registered */
1328 for (i = find_first_bit(mad_reg_req->method_mask,
1329 IB_MGMT_MAX_METHODS);
1330 i < IB_MGMT_MAX_METHODS;
1331 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1332 1+i)) {
1333 (*method)->agent[i] = agent_priv;
1334 }
1335 return 0;
1336
1337 error3:
1338 /* Remove any methods for this mad agent */
1339 remove_methods_mad_agent(*method, agent_priv);
1340 /* Now, check to see if there are any methods in use */
1341 if (!check_method_table(*method)) {
1342 /* If not, release management method table */
1343 kfree(*method);
1344 *method = NULL;
1345 }
1346 ret = -EINVAL;
1347 goto error1;
1348 error2:
1349 kfree(*class);
1350 *class = NULL;
1351 error1:
1352 return ret;
1353 }
1354
1355 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1356 struct ib_mad_agent_private *agent_priv)
1357 {
1358 struct ib_mad_port_private *port_priv;
1359 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1360 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1361 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1362 struct ib_mad_mgmt_method_table **method;
1363 int i, ret = -ENOMEM;
1364 u8 vclass;
1365
1366 /* "New" vendor (with OUI) class */
1367 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1368 port_priv = agent_priv->qp_info->port_priv;
1369 vendor_table = &port_priv->version[
1370 mad_reg_req->mgmt_class_version].vendor;
1371 if (!*vendor_table) {
1372 /* Allocate mgmt vendor class table for "new" class version */
1373 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1374 if (!vendor) {
1375 printk(KERN_ERR PFX "No memory for "
1376 "ib_mad_mgmt_vendor_class_table\n");
1377 goto error1;
1378 }
1379
1380 *vendor_table = vendor;
1381 }
1382 if (!(*vendor_table)->vendor_class[vclass]) {
1383 /* Allocate table for this management vendor class */
1384 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1385 if (!vendor_class) {
1386 printk(KERN_ERR PFX "No memory for "
1387 "ib_mad_mgmt_vendor_class\n");
1388 goto error2;
1389 }
1390
1391 (*vendor_table)->vendor_class[vclass] = vendor_class;
1392 }
1393 for (i = 0; i < MAX_MGMT_OUI; i++) {
1394 /* Is there matching OUI for this vendor class ? */
1395 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1396 mad_reg_req->oui, 3)) {
1397 method = &(*vendor_table)->vendor_class[
1398 vclass]->method_table[i];
1399 BUG_ON(!*method);
1400 goto check_in_use;
1401 }
1402 }
1403 for (i = 0; i < MAX_MGMT_OUI; i++) {
1404 /* OUI slot available ? */
1405 if (!is_vendor_oui((*vendor_table)->vendor_class[
1406 vclass]->oui[i])) {
1407 method = &(*vendor_table)->vendor_class[
1408 vclass]->method_table[i];
1409 BUG_ON(*method);
1410 /* Allocate method table for this OUI */
1411 if ((ret = allocate_method_table(method)))
1412 goto error3;
1413 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1414 mad_reg_req->oui, 3);
1415 goto check_in_use;
1416 }
1417 }
1418 printk(KERN_ERR PFX "All OUI slots in use\n");
1419 goto error3;
1420
1421 check_in_use:
1422 /* Now, make sure methods are not already in use */
1423 if (method_in_use(method, mad_reg_req))
1424 goto error4;
1425
1426 /* Finally, add in methods being registered */
1427 for (i = find_first_bit(mad_reg_req->method_mask,
1428 IB_MGMT_MAX_METHODS);
1429 i < IB_MGMT_MAX_METHODS;
1430 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1431 1+i)) {
1432 (*method)->agent[i] = agent_priv;
1433 }
1434 return 0;
1435
1436 error4:
1437 /* Remove any methods for this mad agent */
1438 remove_methods_mad_agent(*method, agent_priv);
1439 /* Now, check to see if there are any methods in use */
1440 if (!check_method_table(*method)) {
1441 /* If not, release management method table */
1442 kfree(*method);
1443 *method = NULL;
1444 }
1445 ret = -EINVAL;
1446 error3:
1447 if (vendor_class) {
1448 (*vendor_table)->vendor_class[vclass] = NULL;
1449 kfree(vendor_class);
1450 }
1451 error2:
1452 if (vendor) {
1453 *vendor_table = NULL;
1454 kfree(vendor);
1455 }
1456 error1:
1457 return ret;
1458 }
1459
1460 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1461 {
1462 struct ib_mad_port_private *port_priv;
1463 struct ib_mad_mgmt_class_table *class;
1464 struct ib_mad_mgmt_method_table *method;
1465 struct ib_mad_mgmt_vendor_class_table *vendor;
1466 struct ib_mad_mgmt_vendor_class *vendor_class;
1467 int index;
1468 u8 mgmt_class;
1469
1470 /*
1471 * Was MAD registration request supplied
1472 * with original registration ?
1473 */
1474 if (!agent_priv->reg_req) {
1475 goto out;
1476 }
1477
1478 port_priv = agent_priv->qp_info->port_priv;
1479 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1480 class = port_priv->version[
1481 agent_priv->reg_req->mgmt_class_version].class;
1482 if (!class)
1483 goto vendor_check;
1484
1485 method = class->method_table[mgmt_class];
1486 if (method) {
1487 /* Remove any methods for this mad agent */
1488 remove_methods_mad_agent(method, agent_priv);
1489 /* Now, check to see if there are any methods still in use */
1490 if (!check_method_table(method)) {
1491 /* If not, release management method table */
1492 kfree(method);
1493 class->method_table[mgmt_class] = NULL;
1494 /* Any management classes left ? */
1495 if (!check_class_table(class)) {
1496 /* If not, release management class table */
1497 kfree(class);
1498 port_priv->version[
1499 agent_priv->reg_req->
1500 mgmt_class_version].class = NULL;
1501 }
1502 }
1503 }
1504
1505 vendor_check:
1506 if (!is_vendor_class(mgmt_class))
1507 goto out;
1508
1509 /* normalize mgmt_class to vendor range 2 */
1510 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1511 vendor = port_priv->version[
1512 agent_priv->reg_req->mgmt_class_version].vendor;
1513
1514 if (!vendor)
1515 goto out;
1516
1517 vendor_class = vendor->vendor_class[mgmt_class];
1518 if (vendor_class) {
1519 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1520 if (index < 0)
1521 goto out;
1522 method = vendor_class->method_table[index];
1523 if (method) {
1524 /* Remove any methods for this mad agent */
1525 remove_methods_mad_agent(method, agent_priv);
1526 /*
1527 * Now, check to see if there are
1528 * any methods still in use
1529 */
1530 if (!check_method_table(method)) {
1531 /* If not, release management method table */
1532 kfree(method);
1533 vendor_class->method_table[index] = NULL;
1534 memset(vendor_class->oui[index], 0, 3);
1535 /* Any OUIs left ? */
1536 if (!check_vendor_class(vendor_class)) {
1537 /* If not, release vendor class table */
1538 kfree(vendor_class);
1539 vendor->vendor_class[mgmt_class] = NULL;
1540 /* Any other vendor classes left ? */
1541 if (!check_vendor_table(vendor)) {
1542 kfree(vendor);
1543 port_priv->version[
1544 agent_priv->reg_req->
1545 mgmt_class_version].
1546 vendor = NULL;
1547 }
1548 }
1549 }
1550 }
1551 }
1552
1553 out:
1554 return;
1555 }
1556
1557 static struct ib_mad_agent_private *
1558 find_mad_agent(struct ib_mad_port_private *port_priv,
1559 struct ib_mad *mad)
1560 {
1561 struct ib_mad_agent_private *mad_agent = NULL;
1562 unsigned long flags;
1563
1564 spin_lock_irqsave(&port_priv->reg_lock, flags);
1565 if (ib_response_mad(mad)) {
1566 u32 hi_tid;
1567 struct ib_mad_agent_private *entry;
1568
1569 /*
1570 * Routing is based on high 32 bits of transaction ID
1571 * of MAD.
1572 */
1573 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1574 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1575 if (entry->agent.hi_tid == hi_tid) {
1576 mad_agent = entry;
1577 break;
1578 }
1579 }
1580 } else {
1581 struct ib_mad_mgmt_class_table *class;
1582 struct ib_mad_mgmt_method_table *method;
1583 struct ib_mad_mgmt_vendor_class_table *vendor;
1584 struct ib_mad_mgmt_vendor_class *vendor_class;
1585 struct ib_vendor_mad *vendor_mad;
1586 int index;
1587
1588 /*
1589 * Routing is based on version, class, and method
1590 * For "newer" vendor MADs, also based on OUI
1591 */
1592 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1593 goto out;
1594 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1595 class = port_priv->version[
1596 mad->mad_hdr.class_version].class;
1597 if (!class)
1598 goto out;
1599 method = class->method_table[convert_mgmt_class(
1600 mad->mad_hdr.mgmt_class)];
1601 if (method)
1602 mad_agent = method->agent[mad->mad_hdr.method &
1603 ~IB_MGMT_METHOD_RESP];
1604 } else {
1605 vendor = port_priv->version[
1606 mad->mad_hdr.class_version].vendor;
1607 if (!vendor)
1608 goto out;
1609 vendor_class = vendor->vendor_class[vendor_class_index(
1610 mad->mad_hdr.mgmt_class)];
1611 if (!vendor_class)
1612 goto out;
1613 /* Find matching OUI */
1614 vendor_mad = (struct ib_vendor_mad *)mad;
1615 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1616 if (index == -1)
1617 goto out;
1618 method = vendor_class->method_table[index];
1619 if (method) {
1620 mad_agent = method->agent[mad->mad_hdr.method &
1621 ~IB_MGMT_METHOD_RESP];
1622 }
1623 }
1624 }
1625
1626 if (mad_agent) {
1627 if (mad_agent->agent.recv_handler)
1628 atomic_inc(&mad_agent->refcount);
1629 else {
1630 printk(KERN_NOTICE PFX "No receive handler for client "
1631 "%p on port %d\n",
1632 &mad_agent->agent, port_priv->port_num);
1633 mad_agent = NULL;
1634 }
1635 }
1636 out:
1637 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1638
1639 return mad_agent;
1640 }
1641
1642 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1643 {
1644 int valid = 0;
1645
1646 /* Make sure MAD base version is understood */
1647 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1648 printk(KERN_ERR PFX "MAD received with unsupported base "
1649 "version %d\n", mad->mad_hdr.base_version);
1650 goto out;
1651 }
1652
1653 /* Filter SMI packets sent to other than QP0 */
1654 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1655 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1656 if (qp_num == 0)
1657 valid = 1;
1658 } else {
1659 /* Filter GSI packets sent to QP0 */
1660 if (qp_num != 0)
1661 valid = 1;
1662 }
1663
1664 out:
1665 return valid;
1666 }
1667
1668 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1669 struct ib_mad_hdr *mad_hdr)
1670 {
1671 struct ib_rmpp_mad *rmpp_mad;
1672
1673 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1674 return !mad_agent_priv->agent.rmpp_version ||
1675 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1676 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1677 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1678 }
1679
1680 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1681 struct ib_mad_recv_wc *rwc)
1682 {
1683 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1684 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1685 }
1686
1687 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1688 struct ib_mad_send_wr_private *wr,
1689 struct ib_mad_recv_wc *rwc )
1690 {
1691 struct ib_ah_attr attr;
1692 u8 send_resp, rcv_resp;
1693 union ib_gid sgid;
1694 struct ib_device *device = mad_agent_priv->agent.device;
1695 u8 port_num = mad_agent_priv->agent.port_num;
1696 u8 lmc;
1697
1698 send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1699 mad_hdr.method & IB_MGMT_METHOD_RESP;
1700 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1701
1702 if (send_resp == rcv_resp)
1703 /* both requests, or both responses. GIDs different */
1704 return 0;
1705
1706 if (ib_query_ah(wr->send_buf.ah, &attr))
1707 /* Assume not equal, to avoid false positives. */
1708 return 0;
1709
1710 if (!!(attr.ah_flags & IB_AH_GRH) !=
1711 !!(rwc->wc->wc_flags & IB_WC_GRH))
1712 /* one has GID, other does not. Assume different */
1713 return 0;
1714
1715 if (!send_resp && rcv_resp) {
1716 /* is request/response. */
1717 if (!(attr.ah_flags & IB_AH_GRH)) {
1718 if (ib_get_cached_lmc(device, port_num, &lmc))
1719 return 0;
1720 return (!lmc || !((attr.src_path_bits ^
1721 rwc->wc->dlid_path_bits) &
1722 ((1 << lmc) - 1)));
1723 } else {
1724 if (ib_get_cached_gid(device, port_num,
1725 attr.grh.sgid_index, &sgid))
1726 return 0;
1727 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1728 16);
1729 }
1730 }
1731
1732 if (!(attr.ah_flags & IB_AH_GRH))
1733 return attr.dlid == rwc->wc->slid;
1734 else
1735 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1736 16);
1737 }
1738
1739 static inline int is_direct(u8 class)
1740 {
1741 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1742 }
1743
1744 struct ib_mad_send_wr_private*
1745 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1746 struct ib_mad_recv_wc *wc)
1747 {
1748 struct ib_mad_send_wr_private *wr;
1749 struct ib_mad *mad;
1750
1751 mad = (struct ib_mad *)wc->recv_buf.mad;
1752
1753 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1754 if ((wr->tid == mad->mad_hdr.tid) &&
1755 rcv_has_same_class(wr, wc) &&
1756 /*
1757 * Don't check GID for direct routed MADs.
1758 * These might have permissive LIDs.
1759 */
1760 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1761 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1762 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1763 }
1764
1765 /*
1766 * It's possible to receive the response before we've
1767 * been notified that the send has completed
1768 */
1769 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1770 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1771 wr->tid == mad->mad_hdr.tid &&
1772 wr->timeout &&
1773 rcv_has_same_class(wr, wc) &&
1774 /*
1775 * Don't check GID for direct routed MADs.
1776 * These might have permissive LIDs.
1777 */
1778 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1779 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1780 /* Verify request has not been canceled */
1781 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1782 }
1783 return NULL;
1784 }
1785
1786 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1787 {
1788 mad_send_wr->timeout = 0;
1789 if (mad_send_wr->refcount == 1)
1790 list_move_tail(&mad_send_wr->agent_list,
1791 &mad_send_wr->mad_agent_priv->done_list);
1792 }
1793
1794 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1795 struct ib_mad_recv_wc *mad_recv_wc)
1796 {
1797 struct ib_mad_send_wr_private *mad_send_wr;
1798 struct ib_mad_send_wc mad_send_wc;
1799 unsigned long flags;
1800
1801 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1802 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1803 if (mad_agent_priv->agent.rmpp_version) {
1804 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1805 mad_recv_wc);
1806 if (!mad_recv_wc) {
1807 deref_mad_agent(mad_agent_priv);
1808 return;
1809 }
1810 }
1811
1812 /* Complete corresponding request */
1813 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1814 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1815 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1816 if (!mad_send_wr) {
1817 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1818 ib_free_recv_mad(mad_recv_wc);
1819 deref_mad_agent(mad_agent_priv);
1820 return;
1821 }
1822 ib_mark_mad_done(mad_send_wr);
1823 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1824
1825 /* Defined behavior is to complete response before request */
1826 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1827 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1828 mad_recv_wc);
1829 atomic_dec(&mad_agent_priv->refcount);
1830
1831 mad_send_wc.status = IB_WC_SUCCESS;
1832 mad_send_wc.vendor_err = 0;
1833 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1834 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1835 } else {
1836 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1837 mad_recv_wc);
1838 deref_mad_agent(mad_agent_priv);
1839 }
1840 }
1841
1842 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1843 struct ib_wc *wc)
1844 {
1845 struct ib_mad_qp_info *qp_info;
1846 struct ib_mad_private_header *mad_priv_hdr;
1847 struct ib_mad_private *recv, *response = NULL;
1848 struct ib_mad_list_head *mad_list;
1849 struct ib_mad_agent_private *mad_agent;
1850 int port_num;
1851
1852 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1853 qp_info = mad_list->mad_queue->qp_info;
1854 dequeue_mad(mad_list);
1855
1856 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1857 mad_list);
1858 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1859 ib_dma_unmap_single(port_priv->device,
1860 recv->header.mapping,
1861 sizeof(struct ib_mad_private) -
1862 sizeof(struct ib_mad_private_header),
1863 DMA_FROM_DEVICE);
1864
1865 /* Setup MAD receive work completion from "normal" work completion */
1866 recv->header.wc = *wc;
1867 recv->header.recv_wc.wc = &recv->header.wc;
1868 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1869 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1870 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1871
1872 if (atomic_read(&qp_info->snoop_count))
1873 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1874
1875 /* Validate MAD */
1876 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1877 goto out;
1878
1879 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1880 if (!response) {
1881 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1882 "for response buffer\n");
1883 goto out;
1884 }
1885
1886 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1887 port_num = wc->port_num;
1888 else
1889 port_num = port_priv->port_num;
1890
1891 if (recv->mad.mad.mad_hdr.mgmt_class ==
1892 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1893 enum smi_forward_action retsmi;
1894
1895 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1896 port_priv->device->node_type,
1897 port_num,
1898 port_priv->device->phys_port_cnt) ==
1899 IB_SMI_DISCARD)
1900 goto out;
1901
1902 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1903 if (retsmi == IB_SMI_LOCAL)
1904 goto local;
1905
1906 if (retsmi == IB_SMI_SEND) { /* don't forward */
1907 if (smi_handle_dr_smp_send(&recv->mad.smp,
1908 port_priv->device->node_type,
1909 port_num) == IB_SMI_DISCARD)
1910 goto out;
1911
1912 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1913 goto out;
1914 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1915 /* forward case for switches */
1916 memcpy(response, recv, sizeof(*response));
1917 response->header.recv_wc.wc = &response->header.wc;
1918 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1919 response->header.recv_wc.recv_buf.grh = &response->grh;
1920
1921 agent_send_response(&response->mad.mad,
1922 &response->grh, wc,
1923 port_priv->device,
1924 smi_get_fwd_port(&recv->mad.smp),
1925 qp_info->qp->qp_num);
1926
1927 goto out;
1928 }
1929 }
1930
1931 local:
1932 /* Give driver "right of first refusal" on incoming MAD */
1933 if (port_priv->device->process_mad) {
1934 int ret;
1935
1936 ret = port_priv->device->process_mad(port_priv->device, 0,
1937 port_priv->port_num,
1938 wc, &recv->grh,
1939 &recv->mad.mad,
1940 &response->mad.mad);
1941 if (ret & IB_MAD_RESULT_SUCCESS) {
1942 if (ret & IB_MAD_RESULT_CONSUMED)
1943 goto out;
1944 if (ret & IB_MAD_RESULT_REPLY) {
1945 agent_send_response(&response->mad.mad,
1946 &recv->grh, wc,
1947 port_priv->device,
1948 port_num,
1949 qp_info->qp->qp_num);
1950 goto out;
1951 }
1952 }
1953 }
1954
1955 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1956 if (mad_agent) {
1957 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1958 /*
1959 * recv is freed up in error cases in ib_mad_complete_recv
1960 * or via recv_handler in ib_mad_complete_recv()
1961 */
1962 recv = NULL;
1963 }
1964
1965 out:
1966 /* Post another receive request for this QP */
1967 if (response) {
1968 ib_mad_post_receive_mads(qp_info, response);
1969 if (recv)
1970 kmem_cache_free(ib_mad_cache, recv);
1971 } else
1972 ib_mad_post_receive_mads(qp_info, recv);
1973 }
1974
1975 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1976 {
1977 struct ib_mad_send_wr_private *mad_send_wr;
1978 unsigned long delay;
1979
1980 if (list_empty(&mad_agent_priv->wait_list)) {
1981 cancel_delayed_work(&mad_agent_priv->timed_work);
1982 } else {
1983 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1984 struct ib_mad_send_wr_private,
1985 agent_list);
1986
1987 if (time_after(mad_agent_priv->timeout,
1988 mad_send_wr->timeout)) {
1989 mad_agent_priv->timeout = mad_send_wr->timeout;
1990 cancel_delayed_work(&mad_agent_priv->timed_work);
1991 delay = mad_send_wr->timeout - jiffies;
1992 if ((long)delay <= 0)
1993 delay = 1;
1994 queue_delayed_work(mad_agent_priv->qp_info->
1995 port_priv->wq,
1996 &mad_agent_priv->timed_work, delay);
1997 }
1998 }
1999 }
2000
2001 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2002 {
2003 struct ib_mad_agent_private *mad_agent_priv;
2004 struct ib_mad_send_wr_private *temp_mad_send_wr;
2005 struct list_head *list_item;
2006 unsigned long delay;
2007
2008 mad_agent_priv = mad_send_wr->mad_agent_priv;
2009 list_del(&mad_send_wr->agent_list);
2010
2011 delay = mad_send_wr->timeout;
2012 mad_send_wr->timeout += jiffies;
2013
2014 if (delay) {
2015 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2016 temp_mad_send_wr = list_entry(list_item,
2017 struct ib_mad_send_wr_private,
2018 agent_list);
2019 if (time_after(mad_send_wr->timeout,
2020 temp_mad_send_wr->timeout))
2021 break;
2022 }
2023 }
2024 else
2025 list_item = &mad_agent_priv->wait_list;
2026 list_add(&mad_send_wr->agent_list, list_item);
2027
2028 /* Reschedule a work item if we have a shorter timeout */
2029 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2030 cancel_delayed_work(&mad_agent_priv->timed_work);
2031 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2032 &mad_agent_priv->timed_work, delay);
2033 }
2034 }
2035
2036 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2037 int timeout_ms)
2038 {
2039 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2040 wait_for_response(mad_send_wr);
2041 }
2042
2043 /*
2044 * Process a send work completion
2045 */
2046 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2047 struct ib_mad_send_wc *mad_send_wc)
2048 {
2049 struct ib_mad_agent_private *mad_agent_priv;
2050 unsigned long flags;
2051 int ret;
2052
2053 mad_agent_priv = mad_send_wr->mad_agent_priv;
2054 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2055 if (mad_agent_priv->agent.rmpp_version) {
2056 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2057 if (ret == IB_RMPP_RESULT_CONSUMED)
2058 goto done;
2059 } else
2060 ret = IB_RMPP_RESULT_UNHANDLED;
2061
2062 if (mad_send_wc->status != IB_WC_SUCCESS &&
2063 mad_send_wr->status == IB_WC_SUCCESS) {
2064 mad_send_wr->status = mad_send_wc->status;
2065 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2066 }
2067
2068 if (--mad_send_wr->refcount > 0) {
2069 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2070 mad_send_wr->status == IB_WC_SUCCESS) {
2071 wait_for_response(mad_send_wr);
2072 }
2073 goto done;
2074 }
2075
2076 /* Remove send from MAD agent and notify client of completion */
2077 list_del(&mad_send_wr->agent_list);
2078 adjust_timeout(mad_agent_priv);
2079 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2080
2081 if (mad_send_wr->status != IB_WC_SUCCESS )
2082 mad_send_wc->status = mad_send_wr->status;
2083 if (ret == IB_RMPP_RESULT_INTERNAL)
2084 ib_rmpp_send_handler(mad_send_wc);
2085 else
2086 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2087 mad_send_wc);
2088
2089 /* Release reference on agent taken when sending */
2090 deref_mad_agent(mad_agent_priv);
2091 return;
2092 done:
2093 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2094 }
2095
2096 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2097 struct ib_wc *wc)
2098 {
2099 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2100 struct ib_mad_list_head *mad_list;
2101 struct ib_mad_qp_info *qp_info;
2102 struct ib_mad_queue *send_queue;
2103 struct ib_send_wr *bad_send_wr;
2104 struct ib_mad_send_wc mad_send_wc;
2105 unsigned long flags;
2106 int ret;
2107
2108 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2109 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2110 mad_list);
2111 send_queue = mad_list->mad_queue;
2112 qp_info = send_queue->qp_info;
2113
2114 retry:
2115 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2116 mad_send_wr->header_mapping,
2117 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2118 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2119 mad_send_wr->payload_mapping,
2120 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2121 queued_send_wr = NULL;
2122 spin_lock_irqsave(&send_queue->lock, flags);
2123 list_del(&mad_list->list);
2124
2125 /* Move queued send to the send queue */
2126 if (send_queue->count-- > send_queue->max_active) {
2127 mad_list = container_of(qp_info->overflow_list.next,
2128 struct ib_mad_list_head, list);
2129 queued_send_wr = container_of(mad_list,
2130 struct ib_mad_send_wr_private,
2131 mad_list);
2132 list_move_tail(&mad_list->list, &send_queue->list);
2133 }
2134 spin_unlock_irqrestore(&send_queue->lock, flags);
2135
2136 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2137 mad_send_wc.status = wc->status;
2138 mad_send_wc.vendor_err = wc->vendor_err;
2139 if (atomic_read(&qp_info->snoop_count))
2140 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2141 IB_MAD_SNOOP_SEND_COMPLETIONS);
2142 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2143
2144 if (queued_send_wr) {
2145 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2146 &bad_send_wr);
2147 if (ret) {
2148 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2149 mad_send_wr = queued_send_wr;
2150 wc->status = IB_WC_LOC_QP_OP_ERR;
2151 goto retry;
2152 }
2153 }
2154 }
2155
2156 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2157 {
2158 struct ib_mad_send_wr_private *mad_send_wr;
2159 struct ib_mad_list_head *mad_list;
2160 unsigned long flags;
2161
2162 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2163 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2164 mad_send_wr = container_of(mad_list,
2165 struct ib_mad_send_wr_private,
2166 mad_list);
2167 mad_send_wr->retry = 1;
2168 }
2169 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2170 }
2171
2172 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2173 struct ib_wc *wc)
2174 {
2175 struct ib_mad_list_head *mad_list;
2176 struct ib_mad_qp_info *qp_info;
2177 struct ib_mad_send_wr_private *mad_send_wr;
2178 int ret;
2179
2180 /* Determine if failure was a send or receive */
2181 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2182 qp_info = mad_list->mad_queue->qp_info;
2183 if (mad_list->mad_queue == &qp_info->recv_queue)
2184 /*
2185 * Receive errors indicate that the QP has entered the error
2186 * state - error handling/shutdown code will cleanup
2187 */
2188 return;
2189
2190 /*
2191 * Send errors will transition the QP to SQE - move
2192 * QP to RTS and repost flushed work requests
2193 */
2194 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2195 mad_list);
2196 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2197 if (mad_send_wr->retry) {
2198 /* Repost send */
2199 struct ib_send_wr *bad_send_wr;
2200
2201 mad_send_wr->retry = 0;
2202 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2203 &bad_send_wr);
2204 if (ret)
2205 ib_mad_send_done_handler(port_priv, wc);
2206 } else
2207 ib_mad_send_done_handler(port_priv, wc);
2208 } else {
2209 struct ib_qp_attr *attr;
2210
2211 /* Transition QP to RTS and fail offending send */
2212 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2213 if (attr) {
2214 attr->qp_state = IB_QPS_RTS;
2215 attr->cur_qp_state = IB_QPS_SQE;
2216 ret = ib_modify_qp(qp_info->qp, attr,
2217 IB_QP_STATE | IB_QP_CUR_STATE);
2218 kfree(attr);
2219 if (ret)
2220 printk(KERN_ERR PFX "mad_error_handler - "
2221 "ib_modify_qp to RTS : %d\n", ret);
2222 else
2223 mark_sends_for_retry(qp_info);
2224 }
2225 ib_mad_send_done_handler(port_priv, wc);
2226 }
2227 }
2228
2229 /*
2230 * IB MAD completion callback
2231 */
2232 static void ib_mad_completion_handler(struct work_struct *work)
2233 {
2234 struct ib_mad_port_private *port_priv;
2235 struct ib_wc wc;
2236
2237 port_priv = container_of(work, struct ib_mad_port_private, work);
2238 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2239
2240 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2241 if (wc.status == IB_WC_SUCCESS) {
2242 switch (wc.opcode) {
2243 case IB_WC_SEND:
2244 ib_mad_send_done_handler(port_priv, &wc);
2245 break;
2246 case IB_WC_RECV:
2247 ib_mad_recv_done_handler(port_priv, &wc);
2248 break;
2249 default:
2250 BUG_ON(1);
2251 break;
2252 }
2253 } else
2254 mad_error_handler(port_priv, &wc);
2255 }
2256 }
2257
2258 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2259 {
2260 unsigned long flags;
2261 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2262 struct ib_mad_send_wc mad_send_wc;
2263 struct list_head cancel_list;
2264
2265 INIT_LIST_HEAD(&cancel_list);
2266
2267 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2268 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2269 &mad_agent_priv->send_list, agent_list) {
2270 if (mad_send_wr->status == IB_WC_SUCCESS) {
2271 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2272 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2273 }
2274 }
2275
2276 /* Empty wait list to prevent receives from finding a request */
2277 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2278 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2279
2280 /* Report all cancelled requests */
2281 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2282 mad_send_wc.vendor_err = 0;
2283
2284 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2285 &cancel_list, agent_list) {
2286 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2287 list_del(&mad_send_wr->agent_list);
2288 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2289 &mad_send_wc);
2290 atomic_dec(&mad_agent_priv->refcount);
2291 }
2292 }
2293
2294 static struct ib_mad_send_wr_private*
2295 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2296 struct ib_mad_send_buf *send_buf)
2297 {
2298 struct ib_mad_send_wr_private *mad_send_wr;
2299
2300 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2301 agent_list) {
2302 if (&mad_send_wr->send_buf == send_buf)
2303 return mad_send_wr;
2304 }
2305
2306 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2307 agent_list) {
2308 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2309 &mad_send_wr->send_buf == send_buf)
2310 return mad_send_wr;
2311 }
2312 return NULL;
2313 }
2314
2315 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2316 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2317 {
2318 struct ib_mad_agent_private *mad_agent_priv;
2319 struct ib_mad_send_wr_private *mad_send_wr;
2320 unsigned long flags;
2321 int active;
2322
2323 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2324 agent);
2325 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2326 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2327 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2328 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2329 return -EINVAL;
2330 }
2331
2332 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2333 if (!timeout_ms) {
2334 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2335 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2336 }
2337
2338 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2339 if (active)
2340 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2341 else
2342 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2343
2344 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2345 return 0;
2346 }
2347 EXPORT_SYMBOL(ib_modify_mad);
2348
2349 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2350 struct ib_mad_send_buf *send_buf)
2351 {
2352 ib_modify_mad(mad_agent, send_buf, 0);
2353 }
2354 EXPORT_SYMBOL(ib_cancel_mad);
2355
2356 static void local_completions(struct work_struct *work)
2357 {
2358 struct ib_mad_agent_private *mad_agent_priv;
2359 struct ib_mad_local_private *local;
2360 struct ib_mad_agent_private *recv_mad_agent;
2361 unsigned long flags;
2362 int recv = 0;
2363 struct ib_wc wc;
2364 struct ib_mad_send_wc mad_send_wc;
2365
2366 mad_agent_priv =
2367 container_of(work, struct ib_mad_agent_private, local_work);
2368
2369 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2370 while (!list_empty(&mad_agent_priv->local_list)) {
2371 local = list_entry(mad_agent_priv->local_list.next,
2372 struct ib_mad_local_private,
2373 completion_list);
2374 list_del(&local->completion_list);
2375 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2376 if (local->mad_priv) {
2377 recv_mad_agent = local->recv_mad_agent;
2378 if (!recv_mad_agent) {
2379 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2380 goto local_send_completion;
2381 }
2382
2383 recv = 1;
2384 /*
2385 * Defined behavior is to complete response
2386 * before request
2387 */
2388 build_smp_wc(recv_mad_agent->agent.qp,
2389 (unsigned long) local->mad_send_wr,
2390 be16_to_cpu(IB_LID_PERMISSIVE),
2391 0, recv_mad_agent->agent.port_num, &wc);
2392
2393 local->mad_priv->header.recv_wc.wc = &wc;
2394 local->mad_priv->header.recv_wc.mad_len =
2395 sizeof(struct ib_mad);
2396 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2397 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2398 &local->mad_priv->header.recv_wc.rmpp_list);
2399 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2400 local->mad_priv->header.recv_wc.recv_buf.mad =
2401 &local->mad_priv->mad.mad;
2402 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2403 snoop_recv(recv_mad_agent->qp_info,
2404 &local->mad_priv->header.recv_wc,
2405 IB_MAD_SNOOP_RECVS);
2406 recv_mad_agent->agent.recv_handler(
2407 &recv_mad_agent->agent,
2408 &local->mad_priv->header.recv_wc);
2409 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2410 atomic_dec(&recv_mad_agent->refcount);
2411 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2412 }
2413
2414 local_send_completion:
2415 /* Complete send */
2416 mad_send_wc.status = IB_WC_SUCCESS;
2417 mad_send_wc.vendor_err = 0;
2418 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2419 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2420 snoop_send(mad_agent_priv->qp_info,
2421 &local->mad_send_wr->send_buf,
2422 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2423 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2424 &mad_send_wc);
2425
2426 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2427 atomic_dec(&mad_agent_priv->refcount);
2428 if (!recv)
2429 kmem_cache_free(ib_mad_cache, local->mad_priv);
2430 kfree(local);
2431 }
2432 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2433 }
2434
2435 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2436 {
2437 int ret;
2438
2439 if (!mad_send_wr->retries_left)
2440 return -ETIMEDOUT;
2441
2442 mad_send_wr->retries_left--;
2443 mad_send_wr->send_buf.retries++;
2444
2445 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2446
2447 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2448 ret = ib_retry_rmpp(mad_send_wr);
2449 switch (ret) {
2450 case IB_RMPP_RESULT_UNHANDLED:
2451 ret = ib_send_mad(mad_send_wr);
2452 break;
2453 case IB_RMPP_RESULT_CONSUMED:
2454 ret = 0;
2455 break;
2456 default:
2457 ret = -ECOMM;
2458 break;
2459 }
2460 } else
2461 ret = ib_send_mad(mad_send_wr);
2462
2463 if (!ret) {
2464 mad_send_wr->refcount++;
2465 list_add_tail(&mad_send_wr->agent_list,
2466 &mad_send_wr->mad_agent_priv->send_list);
2467 }
2468 return ret;
2469 }
2470
2471 static void timeout_sends(struct work_struct *work)
2472 {
2473 struct ib_mad_agent_private *mad_agent_priv;
2474 struct ib_mad_send_wr_private *mad_send_wr;
2475 struct ib_mad_send_wc mad_send_wc;
2476 unsigned long flags, delay;
2477
2478 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2479 timed_work.work);
2480 mad_send_wc.vendor_err = 0;
2481
2482 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2483 while (!list_empty(&mad_agent_priv->wait_list)) {
2484 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2485 struct ib_mad_send_wr_private,
2486 agent_list);
2487
2488 if (time_after(mad_send_wr->timeout, jiffies)) {
2489 delay = mad_send_wr->timeout - jiffies;
2490 if ((long)delay <= 0)
2491 delay = 1;
2492 queue_delayed_work(mad_agent_priv->qp_info->
2493 port_priv->wq,
2494 &mad_agent_priv->timed_work, delay);
2495 break;
2496 }
2497
2498 list_del(&mad_send_wr->agent_list);
2499 if (mad_send_wr->status == IB_WC_SUCCESS &&
2500 !retry_send(mad_send_wr))
2501 continue;
2502
2503 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2504
2505 if (mad_send_wr->status == IB_WC_SUCCESS)
2506 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2507 else
2508 mad_send_wc.status = mad_send_wr->status;
2509 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2510 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2511 &mad_send_wc);
2512
2513 atomic_dec(&mad_agent_priv->refcount);
2514 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2515 }
2516 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2517 }
2518
2519 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2520 {
2521 struct ib_mad_port_private *port_priv = cq->cq_context;
2522 unsigned long flags;
2523
2524 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2525 if (!list_empty(&port_priv->port_list))
2526 queue_work(port_priv->wq, &port_priv->work);
2527 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2528 }
2529
2530 /*
2531 * Allocate receive MADs and post receive WRs for them
2532 */
2533 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2534 struct ib_mad_private *mad)
2535 {
2536 unsigned long flags;
2537 int post, ret;
2538 struct ib_mad_private *mad_priv;
2539 struct ib_sge sg_list;
2540 struct ib_recv_wr recv_wr, *bad_recv_wr;
2541 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2542
2543 /* Initialize common scatter list fields */
2544 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2545 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2546
2547 /* Initialize common receive WR fields */
2548 recv_wr.next = NULL;
2549 recv_wr.sg_list = &sg_list;
2550 recv_wr.num_sge = 1;
2551
2552 do {
2553 /* Allocate and map receive buffer */
2554 if (mad) {
2555 mad_priv = mad;
2556 mad = NULL;
2557 } else {
2558 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2559 if (!mad_priv) {
2560 printk(KERN_ERR PFX "No memory for receive buffer\n");
2561 ret = -ENOMEM;
2562 break;
2563 }
2564 }
2565 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2566 &mad_priv->grh,
2567 sizeof *mad_priv -
2568 sizeof mad_priv->header,
2569 DMA_FROM_DEVICE);
2570 mad_priv->header.mapping = sg_list.addr;
2571 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2572 mad_priv->header.mad_list.mad_queue = recv_queue;
2573
2574 /* Post receive WR */
2575 spin_lock_irqsave(&recv_queue->lock, flags);
2576 post = (++recv_queue->count < recv_queue->max_active);
2577 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2578 spin_unlock_irqrestore(&recv_queue->lock, flags);
2579 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2580 if (ret) {
2581 spin_lock_irqsave(&recv_queue->lock, flags);
2582 list_del(&mad_priv->header.mad_list.list);
2583 recv_queue->count--;
2584 spin_unlock_irqrestore(&recv_queue->lock, flags);
2585 ib_dma_unmap_single(qp_info->port_priv->device,
2586 mad_priv->header.mapping,
2587 sizeof *mad_priv -
2588 sizeof mad_priv->header,
2589 DMA_FROM_DEVICE);
2590 kmem_cache_free(ib_mad_cache, mad_priv);
2591 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2592 break;
2593 }
2594 } while (post);
2595
2596 return ret;
2597 }
2598
2599 /*
2600 * Return all the posted receive MADs
2601 */
2602 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2603 {
2604 struct ib_mad_private_header *mad_priv_hdr;
2605 struct ib_mad_private *recv;
2606 struct ib_mad_list_head *mad_list;
2607
2608 while (!list_empty(&qp_info->recv_queue.list)) {
2609
2610 mad_list = list_entry(qp_info->recv_queue.list.next,
2611 struct ib_mad_list_head, list);
2612 mad_priv_hdr = container_of(mad_list,
2613 struct ib_mad_private_header,
2614 mad_list);
2615 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2616 header);
2617
2618 /* Remove from posted receive MAD list */
2619 list_del(&mad_list->list);
2620
2621 ib_dma_unmap_single(qp_info->port_priv->device,
2622 recv->header.mapping,
2623 sizeof(struct ib_mad_private) -
2624 sizeof(struct ib_mad_private_header),
2625 DMA_FROM_DEVICE);
2626 kmem_cache_free(ib_mad_cache, recv);
2627 }
2628
2629 qp_info->recv_queue.count = 0;
2630 }
2631
2632 /*
2633 * Start the port
2634 */
2635 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2636 {
2637 int ret, i;
2638 struct ib_qp_attr *attr;
2639 struct ib_qp *qp;
2640
2641 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2642 if (!attr) {
2643 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2644 return -ENOMEM;
2645 }
2646
2647 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2648 qp = port_priv->qp_info[i].qp;
2649 /*
2650 * PKey index for QP1 is irrelevant but
2651 * one is needed for the Reset to Init transition
2652 */
2653 attr->qp_state = IB_QPS_INIT;
2654 attr->pkey_index = 0;
2655 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2656 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2657 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2658 if (ret) {
2659 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2660 "INIT: %d\n", i, ret);
2661 goto out;
2662 }
2663
2664 attr->qp_state = IB_QPS_RTR;
2665 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2666 if (ret) {
2667 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2668 "RTR: %d\n", i, ret);
2669 goto out;
2670 }
2671
2672 attr->qp_state = IB_QPS_RTS;
2673 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2674 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2675 if (ret) {
2676 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2677 "RTS: %d\n", i, ret);
2678 goto out;
2679 }
2680 }
2681
2682 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2683 if (ret) {
2684 printk(KERN_ERR PFX "Failed to request completion "
2685 "notification: %d\n", ret);
2686 goto out;
2687 }
2688
2689 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2690 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2691 if (ret) {
2692 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2693 goto out;
2694 }
2695 }
2696 out:
2697 kfree(attr);
2698 return ret;
2699 }
2700
2701 static void qp_event_handler(struct ib_event *event, void *qp_context)
2702 {
2703 struct ib_mad_qp_info *qp_info = qp_context;
2704
2705 /* It's worse than that! He's dead, Jim! */
2706 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2707 event->event, qp_info->qp->qp_num);
2708 }
2709
2710 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2711 struct ib_mad_queue *mad_queue)
2712 {
2713 mad_queue->qp_info = qp_info;
2714 mad_queue->count = 0;
2715 spin_lock_init(&mad_queue->lock);
2716 INIT_LIST_HEAD(&mad_queue->list);
2717 }
2718
2719 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2720 struct ib_mad_qp_info *qp_info)
2721 {
2722 qp_info->port_priv = port_priv;
2723 init_mad_queue(qp_info, &qp_info->send_queue);
2724 init_mad_queue(qp_info, &qp_info->recv_queue);
2725 INIT_LIST_HEAD(&qp_info->overflow_list);
2726 spin_lock_init(&qp_info->snoop_lock);
2727 qp_info->snoop_table = NULL;
2728 qp_info->snoop_table_size = 0;
2729 atomic_set(&qp_info->snoop_count, 0);
2730 }
2731
2732 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2733 enum ib_qp_type qp_type)
2734 {
2735 struct ib_qp_init_attr qp_init_attr;
2736 int ret;
2737
2738 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2739 qp_init_attr.send_cq = qp_info->port_priv->cq;
2740 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2741 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2742 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2743 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2744 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2745 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2746 qp_init_attr.qp_type = qp_type;
2747 qp_init_attr.port_num = qp_info->port_priv->port_num;
2748 qp_init_attr.qp_context = qp_info;
2749 qp_init_attr.event_handler = qp_event_handler;
2750 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2751 if (IS_ERR(qp_info->qp)) {
2752 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2753 get_spl_qp_index(qp_type));
2754 ret = PTR_ERR(qp_info->qp);
2755 goto error;
2756 }
2757 /* Use minimum queue sizes unless the CQ is resized */
2758 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2759 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2760 return 0;
2761
2762 error:
2763 return ret;
2764 }
2765
2766 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2767 {
2768 ib_destroy_qp(qp_info->qp);
2769 kfree(qp_info->snoop_table);
2770 }
2771
2772 /*
2773 * Open the port
2774 * Create the QP, PD, MR, and CQ if needed
2775 */
2776 static int ib_mad_port_open(struct ib_device *device,
2777 int port_num)
2778 {
2779 int ret, cq_size;
2780 struct ib_mad_port_private *port_priv;
2781 unsigned long flags;
2782 char name[sizeof "ib_mad123"];
2783
2784 /* Create new device info */
2785 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2786 if (!port_priv) {
2787 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2788 return -ENOMEM;
2789 }
2790
2791 port_priv->device = device;
2792 port_priv->port_num = port_num;
2793 spin_lock_init(&port_priv->reg_lock);
2794 INIT_LIST_HEAD(&port_priv->agent_list);
2795 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2796 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2797
2798 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2799 port_priv->cq = ib_create_cq(port_priv->device,
2800 ib_mad_thread_completion_handler,
2801 NULL, port_priv, cq_size, 0);
2802 if (IS_ERR(port_priv->cq)) {
2803 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2804 ret = PTR_ERR(port_priv->cq);
2805 goto error3;
2806 }
2807
2808 port_priv->pd = ib_alloc_pd(device);
2809 if (IS_ERR(port_priv->pd)) {
2810 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2811 ret = PTR_ERR(port_priv->pd);
2812 goto error4;
2813 }
2814
2815 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2816 if (IS_ERR(port_priv->mr)) {
2817 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2818 ret = PTR_ERR(port_priv->mr);
2819 goto error5;
2820 }
2821
2822 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2823 if (ret)
2824 goto error6;
2825 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2826 if (ret)
2827 goto error7;
2828
2829 snprintf(name, sizeof name, "ib_mad%d", port_num);
2830 port_priv->wq = create_singlethread_workqueue(name);
2831 if (!port_priv->wq) {
2832 ret = -ENOMEM;
2833 goto error8;
2834 }
2835 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2836
2837 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2838 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2839 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2840
2841 ret = ib_mad_port_start(port_priv);
2842 if (ret) {
2843 printk(KERN_ERR PFX "Couldn't start port\n");
2844 goto error9;
2845 }
2846
2847 return 0;
2848
2849 error9:
2850 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2851 list_del_init(&port_priv->port_list);
2852 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2853
2854 destroy_workqueue(port_priv->wq);
2855 error8:
2856 destroy_mad_qp(&port_priv->qp_info[1]);
2857 error7:
2858 destroy_mad_qp(&port_priv->qp_info[0]);
2859 error6:
2860 ib_dereg_mr(port_priv->mr);
2861 error5:
2862 ib_dealloc_pd(port_priv->pd);
2863 error4:
2864 ib_destroy_cq(port_priv->cq);
2865 cleanup_recv_queue(&port_priv->qp_info[1]);
2866 cleanup_recv_queue(&port_priv->qp_info[0]);
2867 error3:
2868 kfree(port_priv);
2869
2870 return ret;
2871 }
2872
2873 /*
2874 * Close the port
2875 * If there are no classes using the port, free the port
2876 * resources (CQ, MR, PD, QP) and remove the port's info structure
2877 */
2878 static int ib_mad_port_close(struct ib_device *device, int port_num)
2879 {
2880 struct ib_mad_port_private *port_priv;
2881 unsigned long flags;
2882
2883 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2884 port_priv = __ib_get_mad_port(device, port_num);
2885 if (port_priv == NULL) {
2886 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2887 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2888 return -ENODEV;
2889 }
2890 list_del_init(&port_priv->port_list);
2891 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2892
2893 destroy_workqueue(port_priv->wq);
2894 destroy_mad_qp(&port_priv->qp_info[1]);
2895 destroy_mad_qp(&port_priv->qp_info[0]);
2896 ib_dereg_mr(port_priv->mr);
2897 ib_dealloc_pd(port_priv->pd);
2898 ib_destroy_cq(port_priv->cq);
2899 cleanup_recv_queue(&port_priv->qp_info[1]);
2900 cleanup_recv_queue(&port_priv->qp_info[0]);
2901 /* XXX: Handle deallocation of MAD registration tables */
2902
2903 kfree(port_priv);
2904
2905 return 0;
2906 }
2907
2908 static void ib_mad_init_device(struct ib_device *device)
2909 {
2910 int start, end, i;
2911
2912 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2913 return;
2914
2915 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2916 start = 0;
2917 end = 0;
2918 } else {
2919 start = 1;
2920 end = device->phys_port_cnt;
2921 }
2922
2923 for (i = start; i <= end; i++) {
2924 if (ib_mad_port_open(device, i)) {
2925 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2926 device->name, i);
2927 goto error;
2928 }
2929 if (ib_agent_port_open(device, i)) {
2930 printk(KERN_ERR PFX "Couldn't open %s port %d "
2931 "for agents\n",
2932 device->name, i);
2933 goto error_agent;
2934 }
2935 }
2936 return;
2937
2938 error_agent:
2939 if (ib_mad_port_close(device, i))
2940 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2941 device->name, i);
2942
2943 error:
2944 i--;
2945
2946 while (i >= start) {
2947 if (ib_agent_port_close(device, i))
2948 printk(KERN_ERR PFX "Couldn't close %s port %d "
2949 "for agents\n",
2950 device->name, i);
2951 if (ib_mad_port_close(device, i))
2952 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2953 device->name, i);
2954 i--;
2955 }
2956 }
2957
2958 static void ib_mad_remove_device(struct ib_device *device)
2959 {
2960 int i, num_ports, cur_port;
2961
2962 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2963 num_ports = 1;
2964 cur_port = 0;
2965 } else {
2966 num_ports = device->phys_port_cnt;
2967 cur_port = 1;
2968 }
2969 for (i = 0; i < num_ports; i++, cur_port++) {
2970 if (ib_agent_port_close(device, cur_port))
2971 printk(KERN_ERR PFX "Couldn't close %s port %d "
2972 "for agents\n",
2973 device->name, cur_port);
2974 if (ib_mad_port_close(device, cur_port))
2975 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2976 device->name, cur_port);
2977 }
2978 }
2979
2980 static struct ib_client mad_client = {
2981 .name = "mad",
2982 .add = ib_mad_init_device,
2983 .remove = ib_mad_remove_device
2984 };
2985
2986 static int __init ib_mad_init_module(void)
2987 {
2988 int ret;
2989
2990 spin_lock_init(&ib_mad_port_list_lock);
2991
2992 ib_mad_cache = kmem_cache_create("ib_mad",
2993 sizeof(struct ib_mad_private),
2994 0,
2995 SLAB_HWCACHE_ALIGN,
2996 NULL);
2997 if (!ib_mad_cache) {
2998 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2999 ret = -ENOMEM;
3000 goto error1;
3001 }
3002
3003 INIT_LIST_HEAD(&ib_mad_port_list);
3004
3005 if (ib_register_client(&mad_client)) {
3006 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3007 ret = -EINVAL;
3008 goto error2;
3009 }
3010
3011 return 0;
3012
3013 error2:
3014 kmem_cache_destroy(ib_mad_cache);
3015 error1:
3016 return ret;
3017 }
3018
3019 static void __exit ib_mad_cleanup_module(void)
3020 {
3021 ib_unregister_client(&mad_client);
3022 kmem_cache_destroy(ib_mad_cache);
3023 }
3024
3025 module_init(ib_mad_init_module);
3026 module_exit(ib_mad_cleanup_module);
3027
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