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Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/dvrabel/uwb
[mirror_ubuntu-hirsute-kernel.git] / drivers / infiniband / core / mad.c
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 */
36 #include <linux/dma-mapping.h>
37 #include <rdma/ib_cache.h>
38
39 #include "mad_priv.h"
40 #include "mad_rmpp.h"
41 #include "smi.h"
42 #include "agent.h"
43
44 MODULE_LICENSE("Dual BSD/GPL");
45 MODULE_DESCRIPTION("kernel IB MAD API");
46 MODULE_AUTHOR("Hal Rosenstock");
47 MODULE_AUTHOR("Sean Hefty");
48
49 int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
50 int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
51
52 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
53 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
54 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
55 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
56
57 static struct kmem_cache *ib_mad_cache;
58
59 static struct list_head ib_mad_port_list;
60 static u32 ib_mad_client_id = 0;
61
62 /* Port list lock */
63 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
64
65 /* Forward declarations */
66 static int method_in_use(struct ib_mad_mgmt_method_table **method,
67 struct ib_mad_reg_req *mad_reg_req);
68 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
69 static struct ib_mad_agent_private *find_mad_agent(
70 struct ib_mad_port_private *port_priv,
71 struct ib_mad *mad);
72 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
73 struct ib_mad_private *mad);
74 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
75 static void timeout_sends(struct work_struct *work);
76 static void local_completions(struct work_struct *work);
77 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
78 struct ib_mad_agent_private *agent_priv,
79 u8 mgmt_class);
80 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
81 struct ib_mad_agent_private *agent_priv);
82
83 /*
84 * Returns a ib_mad_port_private structure or NULL for a device/port
85 * Assumes ib_mad_port_list_lock is being held
86 */
87 static inline struct ib_mad_port_private *
88 __ib_get_mad_port(struct ib_device *device, int port_num)
89 {
90 struct ib_mad_port_private *entry;
91
92 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
93 if (entry->device == device && entry->port_num == port_num)
94 return entry;
95 }
96 return NULL;
97 }
98
99 /*
100 * Wrapper function to return a ib_mad_port_private structure or NULL
101 * for a device/port
102 */
103 static inline struct ib_mad_port_private *
104 ib_get_mad_port(struct ib_device *device, int port_num)
105 {
106 struct ib_mad_port_private *entry;
107 unsigned long flags;
108
109 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
110 entry = __ib_get_mad_port(device, port_num);
111 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
112
113 return entry;
114 }
115
116 static inline u8 convert_mgmt_class(u8 mgmt_class)
117 {
118 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
119 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
120 0 : mgmt_class;
121 }
122
123 static int get_spl_qp_index(enum ib_qp_type qp_type)
124 {
125 switch (qp_type)
126 {
127 case IB_QPT_SMI:
128 return 0;
129 case IB_QPT_GSI:
130 return 1;
131 default:
132 return -1;
133 }
134 }
135
136 static int vendor_class_index(u8 mgmt_class)
137 {
138 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
139 }
140
141 static int is_vendor_class(u8 mgmt_class)
142 {
143 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
144 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
145 return 0;
146 return 1;
147 }
148
149 static int is_vendor_oui(char *oui)
150 {
151 if (oui[0] || oui[1] || oui[2])
152 return 1;
153 return 0;
154 }
155
156 static int is_vendor_method_in_use(
157 struct ib_mad_mgmt_vendor_class *vendor_class,
158 struct ib_mad_reg_req *mad_reg_req)
159 {
160 struct ib_mad_mgmt_method_table *method;
161 int i;
162
163 for (i = 0; i < MAX_MGMT_OUI; i++) {
164 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
165 method = vendor_class->method_table[i];
166 if (method) {
167 if (method_in_use(&method, mad_reg_req))
168 return 1;
169 else
170 break;
171 }
172 }
173 }
174 return 0;
175 }
176
177 int ib_response_mad(struct ib_mad *mad)
178 {
179 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
180 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
181 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
182 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
183 }
184 EXPORT_SYMBOL(ib_response_mad);
185
186 /*
187 * ib_register_mad_agent - Register to send/receive MADs
188 */
189 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
190 u8 port_num,
191 enum ib_qp_type qp_type,
192 struct ib_mad_reg_req *mad_reg_req,
193 u8 rmpp_version,
194 ib_mad_send_handler send_handler,
195 ib_mad_recv_handler recv_handler,
196 void *context)
197 {
198 struct ib_mad_port_private *port_priv;
199 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
200 struct ib_mad_agent_private *mad_agent_priv;
201 struct ib_mad_reg_req *reg_req = NULL;
202 struct ib_mad_mgmt_class_table *class;
203 struct ib_mad_mgmt_vendor_class_table *vendor;
204 struct ib_mad_mgmt_vendor_class *vendor_class;
205 struct ib_mad_mgmt_method_table *method;
206 int ret2, qpn;
207 unsigned long flags;
208 u8 mgmt_class, vclass;
209
210 /* Validate parameters */
211 qpn = get_spl_qp_index(qp_type);
212 if (qpn == -1)
213 goto error1;
214
215 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
216 goto error1;
217
218 /* Validate MAD registration request if supplied */
219 if (mad_reg_req) {
220 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
221 goto error1;
222 if (!recv_handler)
223 goto error1;
224 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
225 /*
226 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
227 * one in this range currently allowed
228 */
229 if (mad_reg_req->mgmt_class !=
230 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
231 goto error1;
232 } else if (mad_reg_req->mgmt_class == 0) {
233 /*
234 * Class 0 is reserved in IBA and is used for
235 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
236 */
237 goto error1;
238 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
239 /*
240 * If class is in "new" vendor range,
241 * ensure supplied OUI is not zero
242 */
243 if (!is_vendor_oui(mad_reg_req->oui))
244 goto error1;
245 }
246 /* Make sure class supplied is consistent with RMPP */
247 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
248 if (rmpp_version)
249 goto error1;
250 }
251 /* Make sure class supplied is consistent with QP type */
252 if (qp_type == IB_QPT_SMI) {
253 if ((mad_reg_req->mgmt_class !=
254 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
255 (mad_reg_req->mgmt_class !=
256 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
257 goto error1;
258 } else {
259 if ((mad_reg_req->mgmt_class ==
260 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
261 (mad_reg_req->mgmt_class ==
262 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
263 goto error1;
264 }
265 } else {
266 /* No registration request supplied */
267 if (!send_handler)
268 goto error1;
269 }
270
271 /* Validate device and port */
272 port_priv = ib_get_mad_port(device, port_num);
273 if (!port_priv) {
274 ret = ERR_PTR(-ENODEV);
275 goto error1;
276 }
277
278 /* Allocate structures */
279 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
280 if (!mad_agent_priv) {
281 ret = ERR_PTR(-ENOMEM);
282 goto error1;
283 }
284
285 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
286 IB_ACCESS_LOCAL_WRITE);
287 if (IS_ERR(mad_agent_priv->agent.mr)) {
288 ret = ERR_PTR(-ENOMEM);
289 goto error2;
290 }
291
292 if (mad_reg_req) {
293 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
294 if (!reg_req) {
295 ret = ERR_PTR(-ENOMEM);
296 goto error3;
297 }
298 /* Make a copy of the MAD registration request */
299 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
300 }
301
302 /* Now, fill in the various structures */
303 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
304 mad_agent_priv->reg_req = reg_req;
305 mad_agent_priv->agent.rmpp_version = rmpp_version;
306 mad_agent_priv->agent.device = device;
307 mad_agent_priv->agent.recv_handler = recv_handler;
308 mad_agent_priv->agent.send_handler = send_handler;
309 mad_agent_priv->agent.context = context;
310 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
311 mad_agent_priv->agent.port_num = port_num;
312 spin_lock_init(&mad_agent_priv->lock);
313 INIT_LIST_HEAD(&mad_agent_priv->send_list);
314 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
315 INIT_LIST_HEAD(&mad_agent_priv->done_list);
316 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
317 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
318 INIT_LIST_HEAD(&mad_agent_priv->local_list);
319 INIT_WORK(&mad_agent_priv->local_work, local_completions);
320 atomic_set(&mad_agent_priv->refcount, 1);
321 init_completion(&mad_agent_priv->comp);
322
323 spin_lock_irqsave(&port_priv->reg_lock, flags);
324 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
325
326 /*
327 * Make sure MAD registration (if supplied)
328 * is non overlapping with any existing ones
329 */
330 if (mad_reg_req) {
331 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
332 if (!is_vendor_class(mgmt_class)) {
333 class = port_priv->version[mad_reg_req->
334 mgmt_class_version].class;
335 if (class) {
336 method = class->method_table[mgmt_class];
337 if (method) {
338 if (method_in_use(&method,
339 mad_reg_req))
340 goto error4;
341 }
342 }
343 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
344 mgmt_class);
345 } else {
346 /* "New" vendor class range */
347 vendor = port_priv->version[mad_reg_req->
348 mgmt_class_version].vendor;
349 if (vendor) {
350 vclass = vendor_class_index(mgmt_class);
351 vendor_class = vendor->vendor_class[vclass];
352 if (vendor_class) {
353 if (is_vendor_method_in_use(
354 vendor_class,
355 mad_reg_req))
356 goto error4;
357 }
358 }
359 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
360 }
361 if (ret2) {
362 ret = ERR_PTR(ret2);
363 goto error4;
364 }
365 }
366
367 /* Add mad agent into port's agent list */
368 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
369 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
370
371 return &mad_agent_priv->agent;
372
373 error4:
374 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
375 kfree(reg_req);
376 error3:
377 ib_dereg_mr(mad_agent_priv->agent.mr);
378 error2:
379 kfree(mad_agent_priv);
380 error1:
381 return ret;
382 }
383 EXPORT_SYMBOL(ib_register_mad_agent);
384
385 static inline int is_snooping_sends(int mad_snoop_flags)
386 {
387 return (mad_snoop_flags &
388 (/*IB_MAD_SNOOP_POSTED_SENDS |
389 IB_MAD_SNOOP_RMPP_SENDS |*/
390 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
391 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
392 }
393
394 static inline int is_snooping_recvs(int mad_snoop_flags)
395 {
396 return (mad_snoop_flags &
397 (IB_MAD_SNOOP_RECVS /*|
398 IB_MAD_SNOOP_RMPP_RECVS*/));
399 }
400
401 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
402 struct ib_mad_snoop_private *mad_snoop_priv)
403 {
404 struct ib_mad_snoop_private **new_snoop_table;
405 unsigned long flags;
406 int i;
407
408 spin_lock_irqsave(&qp_info->snoop_lock, flags);
409 /* Check for empty slot in array. */
410 for (i = 0; i < qp_info->snoop_table_size; i++)
411 if (!qp_info->snoop_table[i])
412 break;
413
414 if (i == qp_info->snoop_table_size) {
415 /* Grow table. */
416 new_snoop_table = krealloc(qp_info->snoop_table,
417 sizeof mad_snoop_priv *
418 (qp_info->snoop_table_size + 1),
419 GFP_ATOMIC);
420 if (!new_snoop_table) {
421 i = -ENOMEM;
422 goto out;
423 }
424
425 qp_info->snoop_table = new_snoop_table;
426 qp_info->snoop_table_size++;
427 }
428 qp_info->snoop_table[i] = mad_snoop_priv;
429 atomic_inc(&qp_info->snoop_count);
430 out:
431 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
432 return i;
433 }
434
435 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
436 u8 port_num,
437 enum ib_qp_type qp_type,
438 int mad_snoop_flags,
439 ib_mad_snoop_handler snoop_handler,
440 ib_mad_recv_handler recv_handler,
441 void *context)
442 {
443 struct ib_mad_port_private *port_priv;
444 struct ib_mad_agent *ret;
445 struct ib_mad_snoop_private *mad_snoop_priv;
446 int qpn;
447
448 /* Validate parameters */
449 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
450 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
451 ret = ERR_PTR(-EINVAL);
452 goto error1;
453 }
454 qpn = get_spl_qp_index(qp_type);
455 if (qpn == -1) {
456 ret = ERR_PTR(-EINVAL);
457 goto error1;
458 }
459 port_priv = ib_get_mad_port(device, port_num);
460 if (!port_priv) {
461 ret = ERR_PTR(-ENODEV);
462 goto error1;
463 }
464 /* Allocate structures */
465 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
466 if (!mad_snoop_priv) {
467 ret = ERR_PTR(-ENOMEM);
468 goto error1;
469 }
470
471 /* Now, fill in the various structures */
472 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
473 mad_snoop_priv->agent.device = device;
474 mad_snoop_priv->agent.recv_handler = recv_handler;
475 mad_snoop_priv->agent.snoop_handler = snoop_handler;
476 mad_snoop_priv->agent.context = context;
477 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
478 mad_snoop_priv->agent.port_num = port_num;
479 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
480 init_completion(&mad_snoop_priv->comp);
481 mad_snoop_priv->snoop_index = register_snoop_agent(
482 &port_priv->qp_info[qpn],
483 mad_snoop_priv);
484 if (mad_snoop_priv->snoop_index < 0) {
485 ret = ERR_PTR(mad_snoop_priv->snoop_index);
486 goto error2;
487 }
488
489 atomic_set(&mad_snoop_priv->refcount, 1);
490 return &mad_snoop_priv->agent;
491
492 error2:
493 kfree(mad_snoop_priv);
494 error1:
495 return ret;
496 }
497 EXPORT_SYMBOL(ib_register_mad_snoop);
498
499 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
500 {
501 if (atomic_dec_and_test(&mad_agent_priv->refcount))
502 complete(&mad_agent_priv->comp);
503 }
504
505 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
506 {
507 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
508 complete(&mad_snoop_priv->comp);
509 }
510
511 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
512 {
513 struct ib_mad_port_private *port_priv;
514 unsigned long flags;
515
516 /* Note that we could still be handling received MADs */
517
518 /*
519 * Canceling all sends results in dropping received response
520 * MADs, preventing us from queuing additional work
521 */
522 cancel_mads(mad_agent_priv);
523 port_priv = mad_agent_priv->qp_info->port_priv;
524 cancel_delayed_work(&mad_agent_priv->timed_work);
525
526 spin_lock_irqsave(&port_priv->reg_lock, flags);
527 remove_mad_reg_req(mad_agent_priv);
528 list_del(&mad_agent_priv->agent_list);
529 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
530
531 flush_workqueue(port_priv->wq);
532 ib_cancel_rmpp_recvs(mad_agent_priv);
533
534 deref_mad_agent(mad_agent_priv);
535 wait_for_completion(&mad_agent_priv->comp);
536
537 kfree(mad_agent_priv->reg_req);
538 ib_dereg_mr(mad_agent_priv->agent.mr);
539 kfree(mad_agent_priv);
540 }
541
542 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
543 {
544 struct ib_mad_qp_info *qp_info;
545 unsigned long flags;
546
547 qp_info = mad_snoop_priv->qp_info;
548 spin_lock_irqsave(&qp_info->snoop_lock, flags);
549 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
550 atomic_dec(&qp_info->snoop_count);
551 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
552
553 deref_snoop_agent(mad_snoop_priv);
554 wait_for_completion(&mad_snoop_priv->comp);
555
556 kfree(mad_snoop_priv);
557 }
558
559 /*
560 * ib_unregister_mad_agent - Unregisters a client from using MAD services
561 */
562 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
563 {
564 struct ib_mad_agent_private *mad_agent_priv;
565 struct ib_mad_snoop_private *mad_snoop_priv;
566
567 /* If the TID is zero, the agent can only snoop. */
568 if (mad_agent->hi_tid) {
569 mad_agent_priv = container_of(mad_agent,
570 struct ib_mad_agent_private,
571 agent);
572 unregister_mad_agent(mad_agent_priv);
573 } else {
574 mad_snoop_priv = container_of(mad_agent,
575 struct ib_mad_snoop_private,
576 agent);
577 unregister_mad_snoop(mad_snoop_priv);
578 }
579 return 0;
580 }
581 EXPORT_SYMBOL(ib_unregister_mad_agent);
582
583 static void dequeue_mad(struct ib_mad_list_head *mad_list)
584 {
585 struct ib_mad_queue *mad_queue;
586 unsigned long flags;
587
588 BUG_ON(!mad_list->mad_queue);
589 mad_queue = mad_list->mad_queue;
590 spin_lock_irqsave(&mad_queue->lock, flags);
591 list_del(&mad_list->list);
592 mad_queue->count--;
593 spin_unlock_irqrestore(&mad_queue->lock, flags);
594 }
595
596 static void snoop_send(struct ib_mad_qp_info *qp_info,
597 struct ib_mad_send_buf *send_buf,
598 struct ib_mad_send_wc *mad_send_wc,
599 int mad_snoop_flags)
600 {
601 struct ib_mad_snoop_private *mad_snoop_priv;
602 unsigned long flags;
603 int i;
604
605 spin_lock_irqsave(&qp_info->snoop_lock, flags);
606 for (i = 0; i < qp_info->snoop_table_size; i++) {
607 mad_snoop_priv = qp_info->snoop_table[i];
608 if (!mad_snoop_priv ||
609 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
610 continue;
611
612 atomic_inc(&mad_snoop_priv->refcount);
613 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
614 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
615 send_buf, mad_send_wc);
616 deref_snoop_agent(mad_snoop_priv);
617 spin_lock_irqsave(&qp_info->snoop_lock, flags);
618 }
619 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
620 }
621
622 static void snoop_recv(struct ib_mad_qp_info *qp_info,
623 struct ib_mad_recv_wc *mad_recv_wc,
624 int mad_snoop_flags)
625 {
626 struct ib_mad_snoop_private *mad_snoop_priv;
627 unsigned long flags;
628 int i;
629
630 spin_lock_irqsave(&qp_info->snoop_lock, flags);
631 for (i = 0; i < qp_info->snoop_table_size; i++) {
632 mad_snoop_priv = qp_info->snoop_table[i];
633 if (!mad_snoop_priv ||
634 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
635 continue;
636
637 atomic_inc(&mad_snoop_priv->refcount);
638 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
639 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
640 mad_recv_wc);
641 deref_snoop_agent(mad_snoop_priv);
642 spin_lock_irqsave(&qp_info->snoop_lock, flags);
643 }
644 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
645 }
646
647 static void build_smp_wc(struct ib_qp *qp,
648 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
649 struct ib_wc *wc)
650 {
651 memset(wc, 0, sizeof *wc);
652 wc->wr_id = wr_id;
653 wc->status = IB_WC_SUCCESS;
654 wc->opcode = IB_WC_RECV;
655 wc->pkey_index = pkey_index;
656 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
657 wc->src_qp = IB_QP0;
658 wc->qp = qp;
659 wc->slid = slid;
660 wc->sl = 0;
661 wc->dlid_path_bits = 0;
662 wc->port_num = port_num;
663 }
664
665 /*
666 * Return 0 if SMP is to be sent
667 * Return 1 if SMP was consumed locally (whether or not solicited)
668 * Return < 0 if error
669 */
670 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
671 struct ib_mad_send_wr_private *mad_send_wr)
672 {
673 int ret = 0;
674 struct ib_smp *smp = mad_send_wr->send_buf.mad;
675 unsigned long flags;
676 struct ib_mad_local_private *local;
677 struct ib_mad_private *mad_priv;
678 struct ib_mad_port_private *port_priv;
679 struct ib_mad_agent_private *recv_mad_agent = NULL;
680 struct ib_device *device = mad_agent_priv->agent.device;
681 u8 port_num;
682 struct ib_wc mad_wc;
683 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
684
685 if (device->node_type == RDMA_NODE_IB_SWITCH &&
686 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
687 port_num = send_wr->wr.ud.port_num;
688 else
689 port_num = mad_agent_priv->agent.port_num;
690
691 /*
692 * Directed route handling starts if the initial LID routed part of
693 * a request or the ending LID routed part of a response is empty.
694 * If we are at the start of the LID routed part, don't update the
695 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
696 */
697 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
698 IB_LID_PERMISSIVE &&
699 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
700 IB_SMI_DISCARD) {
701 ret = -EINVAL;
702 printk(KERN_ERR PFX "Invalid directed route\n");
703 goto out;
704 }
705
706 /* Check to post send on QP or process locally */
707 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
708 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
709 goto out;
710
711 local = kmalloc(sizeof *local, GFP_ATOMIC);
712 if (!local) {
713 ret = -ENOMEM;
714 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
715 goto out;
716 }
717 local->mad_priv = NULL;
718 local->recv_mad_agent = NULL;
719 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
720 if (!mad_priv) {
721 ret = -ENOMEM;
722 printk(KERN_ERR PFX "No memory for local response MAD\n");
723 kfree(local);
724 goto out;
725 }
726
727 build_smp_wc(mad_agent_priv->agent.qp,
728 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
729 send_wr->wr.ud.pkey_index,
730 send_wr->wr.ud.port_num, &mad_wc);
731
732 /* No GRH for DR SMP */
733 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
734 (struct ib_mad *)smp,
735 (struct ib_mad *)&mad_priv->mad);
736 switch (ret)
737 {
738 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
739 if (ib_response_mad(&mad_priv->mad.mad) &&
740 mad_agent_priv->agent.recv_handler) {
741 local->mad_priv = mad_priv;
742 local->recv_mad_agent = mad_agent_priv;
743 /*
744 * Reference MAD agent until receive
745 * side of local completion handled
746 */
747 atomic_inc(&mad_agent_priv->refcount);
748 } else
749 kmem_cache_free(ib_mad_cache, mad_priv);
750 break;
751 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
752 kmem_cache_free(ib_mad_cache, mad_priv);
753 break;
754 case IB_MAD_RESULT_SUCCESS:
755 /* Treat like an incoming receive MAD */
756 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
757 mad_agent_priv->agent.port_num);
758 if (port_priv) {
759 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
760 recv_mad_agent = find_mad_agent(port_priv,
761 &mad_priv->mad.mad);
762 }
763 if (!port_priv || !recv_mad_agent) {
764 /*
765 * No receiving agent so drop packet and
766 * generate send completion.
767 */
768 kmem_cache_free(ib_mad_cache, mad_priv);
769 break;
770 }
771 local->mad_priv = mad_priv;
772 local->recv_mad_agent = recv_mad_agent;
773 break;
774 default:
775 kmem_cache_free(ib_mad_cache, mad_priv);
776 kfree(local);
777 ret = -EINVAL;
778 goto out;
779 }
780
781 local->mad_send_wr = mad_send_wr;
782 /* Reference MAD agent until send side of local completion handled */
783 atomic_inc(&mad_agent_priv->refcount);
784 /* Queue local completion to local list */
785 spin_lock_irqsave(&mad_agent_priv->lock, flags);
786 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
787 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
788 queue_work(mad_agent_priv->qp_info->port_priv->wq,
789 &mad_agent_priv->local_work);
790 ret = 1;
791 out:
792 return ret;
793 }
794
795 static int get_pad_size(int hdr_len, int data_len)
796 {
797 int seg_size, pad;
798
799 seg_size = sizeof(struct ib_mad) - hdr_len;
800 if (data_len && seg_size) {
801 pad = seg_size - data_len % seg_size;
802 return pad == seg_size ? 0 : pad;
803 } else
804 return seg_size;
805 }
806
807 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
808 {
809 struct ib_rmpp_segment *s, *t;
810
811 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
812 list_del(&s->list);
813 kfree(s);
814 }
815 }
816
817 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
818 gfp_t gfp_mask)
819 {
820 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
821 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
822 struct ib_rmpp_segment *seg = NULL;
823 int left, seg_size, pad;
824
825 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
826 seg_size = send_buf->seg_size;
827 pad = send_wr->pad;
828
829 /* Allocate data segments. */
830 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
831 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
832 if (!seg) {
833 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
834 "alloc failed for len %zd, gfp %#x\n",
835 sizeof (*seg) + seg_size, gfp_mask);
836 free_send_rmpp_list(send_wr);
837 return -ENOMEM;
838 }
839 seg->num = ++send_buf->seg_count;
840 list_add_tail(&seg->list, &send_wr->rmpp_list);
841 }
842
843 /* Zero any padding */
844 if (pad)
845 memset(seg->data + seg_size - pad, 0, pad);
846
847 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
848 agent.rmpp_version;
849 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
850 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
851
852 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
853 struct ib_rmpp_segment, list);
854 send_wr->last_ack_seg = send_wr->cur_seg;
855 return 0;
856 }
857
858 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
859 u32 remote_qpn, u16 pkey_index,
860 int rmpp_active,
861 int hdr_len, int data_len,
862 gfp_t gfp_mask)
863 {
864 struct ib_mad_agent_private *mad_agent_priv;
865 struct ib_mad_send_wr_private *mad_send_wr;
866 int pad, message_size, ret, size;
867 void *buf;
868
869 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
870 agent);
871 pad = get_pad_size(hdr_len, data_len);
872 message_size = hdr_len + data_len + pad;
873
874 if ((!mad_agent->rmpp_version &&
875 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
876 (!rmpp_active && message_size > sizeof(struct ib_mad)))
877 return ERR_PTR(-EINVAL);
878
879 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
880 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
881 if (!buf)
882 return ERR_PTR(-ENOMEM);
883
884 mad_send_wr = buf + size;
885 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
886 mad_send_wr->send_buf.mad = buf;
887 mad_send_wr->send_buf.hdr_len = hdr_len;
888 mad_send_wr->send_buf.data_len = data_len;
889 mad_send_wr->pad = pad;
890
891 mad_send_wr->mad_agent_priv = mad_agent_priv;
892 mad_send_wr->sg_list[0].length = hdr_len;
893 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
894 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
895 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
896
897 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
898 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
899 mad_send_wr->send_wr.num_sge = 2;
900 mad_send_wr->send_wr.opcode = IB_WR_SEND;
901 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
902 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
903 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
904 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
905
906 if (rmpp_active) {
907 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
908 if (ret) {
909 kfree(buf);
910 return ERR_PTR(ret);
911 }
912 }
913
914 mad_send_wr->send_buf.mad_agent = mad_agent;
915 atomic_inc(&mad_agent_priv->refcount);
916 return &mad_send_wr->send_buf;
917 }
918 EXPORT_SYMBOL(ib_create_send_mad);
919
920 int ib_get_mad_data_offset(u8 mgmt_class)
921 {
922 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
923 return IB_MGMT_SA_HDR;
924 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
925 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
926 (mgmt_class == IB_MGMT_CLASS_BIS))
927 return IB_MGMT_DEVICE_HDR;
928 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
929 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
930 return IB_MGMT_VENDOR_HDR;
931 else
932 return IB_MGMT_MAD_HDR;
933 }
934 EXPORT_SYMBOL(ib_get_mad_data_offset);
935
936 int ib_is_mad_class_rmpp(u8 mgmt_class)
937 {
938 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
939 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
940 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
941 (mgmt_class == IB_MGMT_CLASS_BIS) ||
942 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
943 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
944 return 1;
945 return 0;
946 }
947 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
948
949 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
950 {
951 struct ib_mad_send_wr_private *mad_send_wr;
952 struct list_head *list;
953
954 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
955 send_buf);
956 list = &mad_send_wr->cur_seg->list;
957
958 if (mad_send_wr->cur_seg->num < seg_num) {
959 list_for_each_entry(mad_send_wr->cur_seg, list, list)
960 if (mad_send_wr->cur_seg->num == seg_num)
961 break;
962 } else if (mad_send_wr->cur_seg->num > seg_num) {
963 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
964 if (mad_send_wr->cur_seg->num == seg_num)
965 break;
966 }
967 return mad_send_wr->cur_seg->data;
968 }
969 EXPORT_SYMBOL(ib_get_rmpp_segment);
970
971 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
972 {
973 if (mad_send_wr->send_buf.seg_count)
974 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
975 mad_send_wr->seg_num);
976 else
977 return mad_send_wr->send_buf.mad +
978 mad_send_wr->send_buf.hdr_len;
979 }
980
981 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
982 {
983 struct ib_mad_agent_private *mad_agent_priv;
984 struct ib_mad_send_wr_private *mad_send_wr;
985
986 mad_agent_priv = container_of(send_buf->mad_agent,
987 struct ib_mad_agent_private, agent);
988 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
989 send_buf);
990
991 free_send_rmpp_list(mad_send_wr);
992 kfree(send_buf->mad);
993 deref_mad_agent(mad_agent_priv);
994 }
995 EXPORT_SYMBOL(ib_free_send_mad);
996
997 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
998 {
999 struct ib_mad_qp_info *qp_info;
1000 struct list_head *list;
1001 struct ib_send_wr *bad_send_wr;
1002 struct ib_mad_agent *mad_agent;
1003 struct ib_sge *sge;
1004 unsigned long flags;
1005 int ret;
1006
1007 /* Set WR ID to find mad_send_wr upon completion */
1008 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1009 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1010 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1011
1012 mad_agent = mad_send_wr->send_buf.mad_agent;
1013 sge = mad_send_wr->sg_list;
1014 sge[0].addr = ib_dma_map_single(mad_agent->device,
1015 mad_send_wr->send_buf.mad,
1016 sge[0].length,
1017 DMA_TO_DEVICE);
1018 mad_send_wr->header_mapping = sge[0].addr;
1019
1020 sge[1].addr = ib_dma_map_single(mad_agent->device,
1021 ib_get_payload(mad_send_wr),
1022 sge[1].length,
1023 DMA_TO_DEVICE);
1024 mad_send_wr->payload_mapping = sge[1].addr;
1025
1026 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1027 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1028 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1029 &bad_send_wr);
1030 list = &qp_info->send_queue.list;
1031 } else {
1032 ret = 0;
1033 list = &qp_info->overflow_list;
1034 }
1035
1036 if (!ret) {
1037 qp_info->send_queue.count++;
1038 list_add_tail(&mad_send_wr->mad_list.list, list);
1039 }
1040 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1041 if (ret) {
1042 ib_dma_unmap_single(mad_agent->device,
1043 mad_send_wr->header_mapping,
1044 sge[0].length, DMA_TO_DEVICE);
1045 ib_dma_unmap_single(mad_agent->device,
1046 mad_send_wr->payload_mapping,
1047 sge[1].length, DMA_TO_DEVICE);
1048 }
1049 return ret;
1050 }
1051
1052 /*
1053 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1054 * with the registered client
1055 */
1056 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1057 struct ib_mad_send_buf **bad_send_buf)
1058 {
1059 struct ib_mad_agent_private *mad_agent_priv;
1060 struct ib_mad_send_buf *next_send_buf;
1061 struct ib_mad_send_wr_private *mad_send_wr;
1062 unsigned long flags;
1063 int ret = -EINVAL;
1064
1065 /* Walk list of send WRs and post each on send list */
1066 for (; send_buf; send_buf = next_send_buf) {
1067
1068 mad_send_wr = container_of(send_buf,
1069 struct ib_mad_send_wr_private,
1070 send_buf);
1071 mad_agent_priv = mad_send_wr->mad_agent_priv;
1072
1073 if (!send_buf->mad_agent->send_handler ||
1074 (send_buf->timeout_ms &&
1075 !send_buf->mad_agent->recv_handler)) {
1076 ret = -EINVAL;
1077 goto error;
1078 }
1079
1080 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1081 if (mad_agent_priv->agent.rmpp_version) {
1082 ret = -EINVAL;
1083 goto error;
1084 }
1085 }
1086
1087 /*
1088 * Save pointer to next work request to post in case the
1089 * current one completes, and the user modifies the work
1090 * request associated with the completion
1091 */
1092 next_send_buf = send_buf->next;
1093 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1094
1095 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1096 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1097 ret = handle_outgoing_dr_smp(mad_agent_priv,
1098 mad_send_wr);
1099 if (ret < 0) /* error */
1100 goto error;
1101 else if (ret == 1) /* locally consumed */
1102 continue;
1103 }
1104
1105 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1106 /* Timeout will be updated after send completes */
1107 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1108 mad_send_wr->max_retries = send_buf->retries;
1109 mad_send_wr->retries_left = send_buf->retries;
1110 send_buf->retries = 0;
1111 /* Reference for work request to QP + response */
1112 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1113 mad_send_wr->status = IB_WC_SUCCESS;
1114
1115 /* Reference MAD agent until send completes */
1116 atomic_inc(&mad_agent_priv->refcount);
1117 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1118 list_add_tail(&mad_send_wr->agent_list,
1119 &mad_agent_priv->send_list);
1120 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1121
1122 if (mad_agent_priv->agent.rmpp_version) {
1123 ret = ib_send_rmpp_mad(mad_send_wr);
1124 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1125 ret = ib_send_mad(mad_send_wr);
1126 } else
1127 ret = ib_send_mad(mad_send_wr);
1128 if (ret < 0) {
1129 /* Fail send request */
1130 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1131 list_del(&mad_send_wr->agent_list);
1132 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1133 atomic_dec(&mad_agent_priv->refcount);
1134 goto error;
1135 }
1136 }
1137 return 0;
1138 error:
1139 if (bad_send_buf)
1140 *bad_send_buf = send_buf;
1141 return ret;
1142 }
1143 EXPORT_SYMBOL(ib_post_send_mad);
1144
1145 /*
1146 * ib_free_recv_mad - Returns data buffers used to receive
1147 * a MAD to the access layer
1148 */
1149 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1150 {
1151 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1152 struct ib_mad_private_header *mad_priv_hdr;
1153 struct ib_mad_private *priv;
1154 struct list_head free_list;
1155
1156 INIT_LIST_HEAD(&free_list);
1157 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1158
1159 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1160 &free_list, list) {
1161 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1162 recv_buf);
1163 mad_priv_hdr = container_of(mad_recv_wc,
1164 struct ib_mad_private_header,
1165 recv_wc);
1166 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1167 header);
1168 kmem_cache_free(ib_mad_cache, priv);
1169 }
1170 }
1171 EXPORT_SYMBOL(ib_free_recv_mad);
1172
1173 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1174 u8 rmpp_version,
1175 ib_mad_send_handler send_handler,
1176 ib_mad_recv_handler recv_handler,
1177 void *context)
1178 {
1179 return ERR_PTR(-EINVAL); /* XXX: for now */
1180 }
1181 EXPORT_SYMBOL(ib_redirect_mad_qp);
1182
1183 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1184 struct ib_wc *wc)
1185 {
1186 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1187 return 0;
1188 }
1189 EXPORT_SYMBOL(ib_process_mad_wc);
1190
1191 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1192 struct ib_mad_reg_req *mad_reg_req)
1193 {
1194 int i;
1195
1196 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1197 if ((*method)->agent[i]) {
1198 printk(KERN_ERR PFX "Method %d already in use\n", i);
1199 return -EINVAL;
1200 }
1201 }
1202 return 0;
1203 }
1204
1205 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1206 {
1207 /* Allocate management method table */
1208 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1209 if (!*method) {
1210 printk(KERN_ERR PFX "No memory for "
1211 "ib_mad_mgmt_method_table\n");
1212 return -ENOMEM;
1213 }
1214
1215 return 0;
1216 }
1217
1218 /*
1219 * Check to see if there are any methods still in use
1220 */
1221 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1222 {
1223 int i;
1224
1225 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1226 if (method->agent[i])
1227 return 1;
1228 return 0;
1229 }
1230
1231 /*
1232 * Check to see if there are any method tables for this class still in use
1233 */
1234 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1235 {
1236 int i;
1237
1238 for (i = 0; i < MAX_MGMT_CLASS; i++)
1239 if (class->method_table[i])
1240 return 1;
1241 return 0;
1242 }
1243
1244 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1245 {
1246 int i;
1247
1248 for (i = 0; i < MAX_MGMT_OUI; i++)
1249 if (vendor_class->method_table[i])
1250 return 1;
1251 return 0;
1252 }
1253
1254 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1255 char *oui)
1256 {
1257 int i;
1258
1259 for (i = 0; i < MAX_MGMT_OUI; i++)
1260 /* Is there matching OUI for this vendor class ? */
1261 if (!memcmp(vendor_class->oui[i], oui, 3))
1262 return i;
1263
1264 return -1;
1265 }
1266
1267 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1268 {
1269 int i;
1270
1271 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1272 if (vendor->vendor_class[i])
1273 return 1;
1274
1275 return 0;
1276 }
1277
1278 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1279 struct ib_mad_agent_private *agent)
1280 {
1281 int i;
1282
1283 /* Remove any methods for this mad agent */
1284 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1285 if (method->agent[i] == agent) {
1286 method->agent[i] = NULL;
1287 }
1288 }
1289 }
1290
1291 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1292 struct ib_mad_agent_private *agent_priv,
1293 u8 mgmt_class)
1294 {
1295 struct ib_mad_port_private *port_priv;
1296 struct ib_mad_mgmt_class_table **class;
1297 struct ib_mad_mgmt_method_table **method;
1298 int i, ret;
1299
1300 port_priv = agent_priv->qp_info->port_priv;
1301 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1302 if (!*class) {
1303 /* Allocate management class table for "new" class version */
1304 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1305 if (!*class) {
1306 printk(KERN_ERR PFX "No memory for "
1307 "ib_mad_mgmt_class_table\n");
1308 ret = -ENOMEM;
1309 goto error1;
1310 }
1311
1312 /* Allocate method table for this management class */
1313 method = &(*class)->method_table[mgmt_class];
1314 if ((ret = allocate_method_table(method)))
1315 goto error2;
1316 } else {
1317 method = &(*class)->method_table[mgmt_class];
1318 if (!*method) {
1319 /* Allocate method table for this management class */
1320 if ((ret = allocate_method_table(method)))
1321 goto error1;
1322 }
1323 }
1324
1325 /* Now, make sure methods are not already in use */
1326 if (method_in_use(method, mad_reg_req))
1327 goto error3;
1328
1329 /* Finally, add in methods being registered */
1330 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1331 (*method)->agent[i] = agent_priv;
1332
1333 return 0;
1334
1335 error3:
1336 /* Remove any methods for this mad agent */
1337 remove_methods_mad_agent(*method, agent_priv);
1338 /* Now, check to see if there are any methods in use */
1339 if (!check_method_table(*method)) {
1340 /* If not, release management method table */
1341 kfree(*method);
1342 *method = NULL;
1343 }
1344 ret = -EINVAL;
1345 goto error1;
1346 error2:
1347 kfree(*class);
1348 *class = NULL;
1349 error1:
1350 return ret;
1351 }
1352
1353 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1354 struct ib_mad_agent_private *agent_priv)
1355 {
1356 struct ib_mad_port_private *port_priv;
1357 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1358 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1359 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1360 struct ib_mad_mgmt_method_table **method;
1361 int i, ret = -ENOMEM;
1362 u8 vclass;
1363
1364 /* "New" vendor (with OUI) class */
1365 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1366 port_priv = agent_priv->qp_info->port_priv;
1367 vendor_table = &port_priv->version[
1368 mad_reg_req->mgmt_class_version].vendor;
1369 if (!*vendor_table) {
1370 /* Allocate mgmt vendor class table for "new" class version */
1371 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1372 if (!vendor) {
1373 printk(KERN_ERR PFX "No memory for "
1374 "ib_mad_mgmt_vendor_class_table\n");
1375 goto error1;
1376 }
1377
1378 *vendor_table = vendor;
1379 }
1380 if (!(*vendor_table)->vendor_class[vclass]) {
1381 /* Allocate table for this management vendor class */
1382 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1383 if (!vendor_class) {
1384 printk(KERN_ERR PFX "No memory for "
1385 "ib_mad_mgmt_vendor_class\n");
1386 goto error2;
1387 }
1388
1389 (*vendor_table)->vendor_class[vclass] = vendor_class;
1390 }
1391 for (i = 0; i < MAX_MGMT_OUI; i++) {
1392 /* Is there matching OUI for this vendor class ? */
1393 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1394 mad_reg_req->oui, 3)) {
1395 method = &(*vendor_table)->vendor_class[
1396 vclass]->method_table[i];
1397 BUG_ON(!*method);
1398 goto check_in_use;
1399 }
1400 }
1401 for (i = 0; i < MAX_MGMT_OUI; i++) {
1402 /* OUI slot available ? */
1403 if (!is_vendor_oui((*vendor_table)->vendor_class[
1404 vclass]->oui[i])) {
1405 method = &(*vendor_table)->vendor_class[
1406 vclass]->method_table[i];
1407 BUG_ON(*method);
1408 /* Allocate method table for this OUI */
1409 if ((ret = allocate_method_table(method)))
1410 goto error3;
1411 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1412 mad_reg_req->oui, 3);
1413 goto check_in_use;
1414 }
1415 }
1416 printk(KERN_ERR PFX "All OUI slots in use\n");
1417 goto error3;
1418
1419 check_in_use:
1420 /* Now, make sure methods are not already in use */
1421 if (method_in_use(method, mad_reg_req))
1422 goto error4;
1423
1424 /* Finally, add in methods being registered */
1425 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1426 (*method)->agent[i] = agent_priv;
1427
1428 return 0;
1429
1430 error4:
1431 /* Remove any methods for this mad agent */
1432 remove_methods_mad_agent(*method, agent_priv);
1433 /* Now, check to see if there are any methods in use */
1434 if (!check_method_table(*method)) {
1435 /* If not, release management method table */
1436 kfree(*method);
1437 *method = NULL;
1438 }
1439 ret = -EINVAL;
1440 error3:
1441 if (vendor_class) {
1442 (*vendor_table)->vendor_class[vclass] = NULL;
1443 kfree(vendor_class);
1444 }
1445 error2:
1446 if (vendor) {
1447 *vendor_table = NULL;
1448 kfree(vendor);
1449 }
1450 error1:
1451 return ret;
1452 }
1453
1454 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1455 {
1456 struct ib_mad_port_private *port_priv;
1457 struct ib_mad_mgmt_class_table *class;
1458 struct ib_mad_mgmt_method_table *method;
1459 struct ib_mad_mgmt_vendor_class_table *vendor;
1460 struct ib_mad_mgmt_vendor_class *vendor_class;
1461 int index;
1462 u8 mgmt_class;
1463
1464 /*
1465 * Was MAD registration request supplied
1466 * with original registration ?
1467 */
1468 if (!agent_priv->reg_req) {
1469 goto out;
1470 }
1471
1472 port_priv = agent_priv->qp_info->port_priv;
1473 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1474 class = port_priv->version[
1475 agent_priv->reg_req->mgmt_class_version].class;
1476 if (!class)
1477 goto vendor_check;
1478
1479 method = class->method_table[mgmt_class];
1480 if (method) {
1481 /* Remove any methods for this mad agent */
1482 remove_methods_mad_agent(method, agent_priv);
1483 /* Now, check to see if there are any methods still in use */
1484 if (!check_method_table(method)) {
1485 /* If not, release management method table */
1486 kfree(method);
1487 class->method_table[mgmt_class] = NULL;
1488 /* Any management classes left ? */
1489 if (!check_class_table(class)) {
1490 /* If not, release management class table */
1491 kfree(class);
1492 port_priv->version[
1493 agent_priv->reg_req->
1494 mgmt_class_version].class = NULL;
1495 }
1496 }
1497 }
1498
1499 vendor_check:
1500 if (!is_vendor_class(mgmt_class))
1501 goto out;
1502
1503 /* normalize mgmt_class to vendor range 2 */
1504 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1505 vendor = port_priv->version[
1506 agent_priv->reg_req->mgmt_class_version].vendor;
1507
1508 if (!vendor)
1509 goto out;
1510
1511 vendor_class = vendor->vendor_class[mgmt_class];
1512 if (vendor_class) {
1513 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1514 if (index < 0)
1515 goto out;
1516 method = vendor_class->method_table[index];
1517 if (method) {
1518 /* Remove any methods for this mad agent */
1519 remove_methods_mad_agent(method, agent_priv);
1520 /*
1521 * Now, check to see if there are
1522 * any methods still in use
1523 */
1524 if (!check_method_table(method)) {
1525 /* If not, release management method table */
1526 kfree(method);
1527 vendor_class->method_table[index] = NULL;
1528 memset(vendor_class->oui[index], 0, 3);
1529 /* Any OUIs left ? */
1530 if (!check_vendor_class(vendor_class)) {
1531 /* If not, release vendor class table */
1532 kfree(vendor_class);
1533 vendor->vendor_class[mgmt_class] = NULL;
1534 /* Any other vendor classes left ? */
1535 if (!check_vendor_table(vendor)) {
1536 kfree(vendor);
1537 port_priv->version[
1538 agent_priv->reg_req->
1539 mgmt_class_version].
1540 vendor = NULL;
1541 }
1542 }
1543 }
1544 }
1545 }
1546
1547 out:
1548 return;
1549 }
1550
1551 static struct ib_mad_agent_private *
1552 find_mad_agent(struct ib_mad_port_private *port_priv,
1553 struct ib_mad *mad)
1554 {
1555 struct ib_mad_agent_private *mad_agent = NULL;
1556 unsigned long flags;
1557
1558 spin_lock_irqsave(&port_priv->reg_lock, flags);
1559 if (ib_response_mad(mad)) {
1560 u32 hi_tid;
1561 struct ib_mad_agent_private *entry;
1562
1563 /*
1564 * Routing is based on high 32 bits of transaction ID
1565 * of MAD.
1566 */
1567 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1568 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1569 if (entry->agent.hi_tid == hi_tid) {
1570 mad_agent = entry;
1571 break;
1572 }
1573 }
1574 } else {
1575 struct ib_mad_mgmt_class_table *class;
1576 struct ib_mad_mgmt_method_table *method;
1577 struct ib_mad_mgmt_vendor_class_table *vendor;
1578 struct ib_mad_mgmt_vendor_class *vendor_class;
1579 struct ib_vendor_mad *vendor_mad;
1580 int index;
1581
1582 /*
1583 * Routing is based on version, class, and method
1584 * For "newer" vendor MADs, also based on OUI
1585 */
1586 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1587 goto out;
1588 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1589 class = port_priv->version[
1590 mad->mad_hdr.class_version].class;
1591 if (!class)
1592 goto out;
1593 method = class->method_table[convert_mgmt_class(
1594 mad->mad_hdr.mgmt_class)];
1595 if (method)
1596 mad_agent = method->agent[mad->mad_hdr.method &
1597 ~IB_MGMT_METHOD_RESP];
1598 } else {
1599 vendor = port_priv->version[
1600 mad->mad_hdr.class_version].vendor;
1601 if (!vendor)
1602 goto out;
1603 vendor_class = vendor->vendor_class[vendor_class_index(
1604 mad->mad_hdr.mgmt_class)];
1605 if (!vendor_class)
1606 goto out;
1607 /* Find matching OUI */
1608 vendor_mad = (struct ib_vendor_mad *)mad;
1609 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1610 if (index == -1)
1611 goto out;
1612 method = vendor_class->method_table[index];
1613 if (method) {
1614 mad_agent = method->agent[mad->mad_hdr.method &
1615 ~IB_MGMT_METHOD_RESP];
1616 }
1617 }
1618 }
1619
1620 if (mad_agent) {
1621 if (mad_agent->agent.recv_handler)
1622 atomic_inc(&mad_agent->refcount);
1623 else {
1624 printk(KERN_NOTICE PFX "No receive handler for client "
1625 "%p on port %d\n",
1626 &mad_agent->agent, port_priv->port_num);
1627 mad_agent = NULL;
1628 }
1629 }
1630 out:
1631 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1632
1633 return mad_agent;
1634 }
1635
1636 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1637 {
1638 int valid = 0;
1639
1640 /* Make sure MAD base version is understood */
1641 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1642 printk(KERN_ERR PFX "MAD received with unsupported base "
1643 "version %d\n", mad->mad_hdr.base_version);
1644 goto out;
1645 }
1646
1647 /* Filter SMI packets sent to other than QP0 */
1648 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1649 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1650 if (qp_num == 0)
1651 valid = 1;
1652 } else {
1653 /* Filter GSI packets sent to QP0 */
1654 if (qp_num != 0)
1655 valid = 1;
1656 }
1657
1658 out:
1659 return valid;
1660 }
1661
1662 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1663 struct ib_mad_hdr *mad_hdr)
1664 {
1665 struct ib_rmpp_mad *rmpp_mad;
1666
1667 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1668 return !mad_agent_priv->agent.rmpp_version ||
1669 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1670 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1671 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1672 }
1673
1674 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1675 struct ib_mad_recv_wc *rwc)
1676 {
1677 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1678 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1679 }
1680
1681 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1682 struct ib_mad_send_wr_private *wr,
1683 struct ib_mad_recv_wc *rwc )
1684 {
1685 struct ib_ah_attr attr;
1686 u8 send_resp, rcv_resp;
1687 union ib_gid sgid;
1688 struct ib_device *device = mad_agent_priv->agent.device;
1689 u8 port_num = mad_agent_priv->agent.port_num;
1690 u8 lmc;
1691
1692 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1693 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1694
1695 if (send_resp == rcv_resp)
1696 /* both requests, or both responses. GIDs different */
1697 return 0;
1698
1699 if (ib_query_ah(wr->send_buf.ah, &attr))
1700 /* Assume not equal, to avoid false positives. */
1701 return 0;
1702
1703 if (!!(attr.ah_flags & IB_AH_GRH) !=
1704 !!(rwc->wc->wc_flags & IB_WC_GRH))
1705 /* one has GID, other does not. Assume different */
1706 return 0;
1707
1708 if (!send_resp && rcv_resp) {
1709 /* is request/response. */
1710 if (!(attr.ah_flags & IB_AH_GRH)) {
1711 if (ib_get_cached_lmc(device, port_num, &lmc))
1712 return 0;
1713 return (!lmc || !((attr.src_path_bits ^
1714 rwc->wc->dlid_path_bits) &
1715 ((1 << lmc) - 1)));
1716 } else {
1717 if (ib_get_cached_gid(device, port_num,
1718 attr.grh.sgid_index, &sgid))
1719 return 0;
1720 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1721 16);
1722 }
1723 }
1724
1725 if (!(attr.ah_flags & IB_AH_GRH))
1726 return attr.dlid == rwc->wc->slid;
1727 else
1728 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1729 16);
1730 }
1731
1732 static inline int is_direct(u8 class)
1733 {
1734 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1735 }
1736
1737 struct ib_mad_send_wr_private*
1738 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1739 struct ib_mad_recv_wc *wc)
1740 {
1741 struct ib_mad_send_wr_private *wr;
1742 struct ib_mad *mad;
1743
1744 mad = (struct ib_mad *)wc->recv_buf.mad;
1745
1746 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1747 if ((wr->tid == mad->mad_hdr.tid) &&
1748 rcv_has_same_class(wr, wc) &&
1749 /*
1750 * Don't check GID for direct routed MADs.
1751 * These might have permissive LIDs.
1752 */
1753 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1754 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1755 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1756 }
1757
1758 /*
1759 * It's possible to receive the response before we've
1760 * been notified that the send has completed
1761 */
1762 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1763 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1764 wr->tid == mad->mad_hdr.tid &&
1765 wr->timeout &&
1766 rcv_has_same_class(wr, wc) &&
1767 /*
1768 * Don't check GID for direct routed MADs.
1769 * These might have permissive LIDs.
1770 */
1771 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1772 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1773 /* Verify request has not been canceled */
1774 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1775 }
1776 return NULL;
1777 }
1778
1779 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1780 {
1781 mad_send_wr->timeout = 0;
1782 if (mad_send_wr->refcount == 1)
1783 list_move_tail(&mad_send_wr->agent_list,
1784 &mad_send_wr->mad_agent_priv->done_list);
1785 }
1786
1787 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1788 struct ib_mad_recv_wc *mad_recv_wc)
1789 {
1790 struct ib_mad_send_wr_private *mad_send_wr;
1791 struct ib_mad_send_wc mad_send_wc;
1792 unsigned long flags;
1793
1794 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1795 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1796 if (mad_agent_priv->agent.rmpp_version) {
1797 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1798 mad_recv_wc);
1799 if (!mad_recv_wc) {
1800 deref_mad_agent(mad_agent_priv);
1801 return;
1802 }
1803 }
1804
1805 /* Complete corresponding request */
1806 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1807 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1808 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1809 if (!mad_send_wr) {
1810 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1811 ib_free_recv_mad(mad_recv_wc);
1812 deref_mad_agent(mad_agent_priv);
1813 return;
1814 }
1815 ib_mark_mad_done(mad_send_wr);
1816 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1817
1818 /* Defined behavior is to complete response before request */
1819 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1820 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1821 mad_recv_wc);
1822 atomic_dec(&mad_agent_priv->refcount);
1823
1824 mad_send_wc.status = IB_WC_SUCCESS;
1825 mad_send_wc.vendor_err = 0;
1826 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1827 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1828 } else {
1829 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1830 mad_recv_wc);
1831 deref_mad_agent(mad_agent_priv);
1832 }
1833 }
1834
1835 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1836 struct ib_wc *wc)
1837 {
1838 struct ib_mad_qp_info *qp_info;
1839 struct ib_mad_private_header *mad_priv_hdr;
1840 struct ib_mad_private *recv, *response = NULL;
1841 struct ib_mad_list_head *mad_list;
1842 struct ib_mad_agent_private *mad_agent;
1843 int port_num;
1844
1845 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1846 qp_info = mad_list->mad_queue->qp_info;
1847 dequeue_mad(mad_list);
1848
1849 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1850 mad_list);
1851 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1852 ib_dma_unmap_single(port_priv->device,
1853 recv->header.mapping,
1854 sizeof(struct ib_mad_private) -
1855 sizeof(struct ib_mad_private_header),
1856 DMA_FROM_DEVICE);
1857
1858 /* Setup MAD receive work completion from "normal" work completion */
1859 recv->header.wc = *wc;
1860 recv->header.recv_wc.wc = &recv->header.wc;
1861 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1862 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1863 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1864
1865 if (atomic_read(&qp_info->snoop_count))
1866 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1867
1868 /* Validate MAD */
1869 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1870 goto out;
1871
1872 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1873 if (!response) {
1874 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1875 "for response buffer\n");
1876 goto out;
1877 }
1878
1879 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1880 port_num = wc->port_num;
1881 else
1882 port_num = port_priv->port_num;
1883
1884 if (recv->mad.mad.mad_hdr.mgmt_class ==
1885 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1886 enum smi_forward_action retsmi;
1887
1888 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1889 port_priv->device->node_type,
1890 port_num,
1891 port_priv->device->phys_port_cnt) ==
1892 IB_SMI_DISCARD)
1893 goto out;
1894
1895 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1896 if (retsmi == IB_SMI_LOCAL)
1897 goto local;
1898
1899 if (retsmi == IB_SMI_SEND) { /* don't forward */
1900 if (smi_handle_dr_smp_send(&recv->mad.smp,
1901 port_priv->device->node_type,
1902 port_num) == IB_SMI_DISCARD)
1903 goto out;
1904
1905 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1906 goto out;
1907 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1908 /* forward case for switches */
1909 memcpy(response, recv, sizeof(*response));
1910 response->header.recv_wc.wc = &response->header.wc;
1911 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1912 response->header.recv_wc.recv_buf.grh = &response->grh;
1913
1914 agent_send_response(&response->mad.mad,
1915 &response->grh, wc,
1916 port_priv->device,
1917 smi_get_fwd_port(&recv->mad.smp),
1918 qp_info->qp->qp_num);
1919
1920 goto out;
1921 }
1922 }
1923
1924 local:
1925 /* Give driver "right of first refusal" on incoming MAD */
1926 if (port_priv->device->process_mad) {
1927 int ret;
1928
1929 ret = port_priv->device->process_mad(port_priv->device, 0,
1930 port_priv->port_num,
1931 wc, &recv->grh,
1932 &recv->mad.mad,
1933 &response->mad.mad);
1934 if (ret & IB_MAD_RESULT_SUCCESS) {
1935 if (ret & IB_MAD_RESULT_CONSUMED)
1936 goto out;
1937 if (ret & IB_MAD_RESULT_REPLY) {
1938 agent_send_response(&response->mad.mad,
1939 &recv->grh, wc,
1940 port_priv->device,
1941 port_num,
1942 qp_info->qp->qp_num);
1943 goto out;
1944 }
1945 }
1946 }
1947
1948 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1949 if (mad_agent) {
1950 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1951 /*
1952 * recv is freed up in error cases in ib_mad_complete_recv
1953 * or via recv_handler in ib_mad_complete_recv()
1954 */
1955 recv = NULL;
1956 }
1957
1958 out:
1959 /* Post another receive request for this QP */
1960 if (response) {
1961 ib_mad_post_receive_mads(qp_info, response);
1962 if (recv)
1963 kmem_cache_free(ib_mad_cache, recv);
1964 } else
1965 ib_mad_post_receive_mads(qp_info, recv);
1966 }
1967
1968 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1969 {
1970 struct ib_mad_send_wr_private *mad_send_wr;
1971 unsigned long delay;
1972
1973 if (list_empty(&mad_agent_priv->wait_list)) {
1974 __cancel_delayed_work(&mad_agent_priv->timed_work);
1975 } else {
1976 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1977 struct ib_mad_send_wr_private,
1978 agent_list);
1979
1980 if (time_after(mad_agent_priv->timeout,
1981 mad_send_wr->timeout)) {
1982 mad_agent_priv->timeout = mad_send_wr->timeout;
1983 __cancel_delayed_work(&mad_agent_priv->timed_work);
1984 delay = mad_send_wr->timeout - jiffies;
1985 if ((long)delay <= 0)
1986 delay = 1;
1987 queue_delayed_work(mad_agent_priv->qp_info->
1988 port_priv->wq,
1989 &mad_agent_priv->timed_work, delay);
1990 }
1991 }
1992 }
1993
1994 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1995 {
1996 struct ib_mad_agent_private *mad_agent_priv;
1997 struct ib_mad_send_wr_private *temp_mad_send_wr;
1998 struct list_head *list_item;
1999 unsigned long delay;
2000
2001 mad_agent_priv = mad_send_wr->mad_agent_priv;
2002 list_del(&mad_send_wr->agent_list);
2003
2004 delay = mad_send_wr->timeout;
2005 mad_send_wr->timeout += jiffies;
2006
2007 if (delay) {
2008 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2009 temp_mad_send_wr = list_entry(list_item,
2010 struct ib_mad_send_wr_private,
2011 agent_list);
2012 if (time_after(mad_send_wr->timeout,
2013 temp_mad_send_wr->timeout))
2014 break;
2015 }
2016 }
2017 else
2018 list_item = &mad_agent_priv->wait_list;
2019 list_add(&mad_send_wr->agent_list, list_item);
2020
2021 /* Reschedule a work item if we have a shorter timeout */
2022 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2023 __cancel_delayed_work(&mad_agent_priv->timed_work);
2024 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2025 &mad_agent_priv->timed_work, delay);
2026 }
2027 }
2028
2029 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2030 int timeout_ms)
2031 {
2032 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2033 wait_for_response(mad_send_wr);
2034 }
2035
2036 /*
2037 * Process a send work completion
2038 */
2039 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2040 struct ib_mad_send_wc *mad_send_wc)
2041 {
2042 struct ib_mad_agent_private *mad_agent_priv;
2043 unsigned long flags;
2044 int ret;
2045
2046 mad_agent_priv = mad_send_wr->mad_agent_priv;
2047 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2048 if (mad_agent_priv->agent.rmpp_version) {
2049 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2050 if (ret == IB_RMPP_RESULT_CONSUMED)
2051 goto done;
2052 } else
2053 ret = IB_RMPP_RESULT_UNHANDLED;
2054
2055 if (mad_send_wc->status != IB_WC_SUCCESS &&
2056 mad_send_wr->status == IB_WC_SUCCESS) {
2057 mad_send_wr->status = mad_send_wc->status;
2058 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2059 }
2060
2061 if (--mad_send_wr->refcount > 0) {
2062 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2063 mad_send_wr->status == IB_WC_SUCCESS) {
2064 wait_for_response(mad_send_wr);
2065 }
2066 goto done;
2067 }
2068
2069 /* Remove send from MAD agent and notify client of completion */
2070 list_del(&mad_send_wr->agent_list);
2071 adjust_timeout(mad_agent_priv);
2072 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2073
2074 if (mad_send_wr->status != IB_WC_SUCCESS )
2075 mad_send_wc->status = mad_send_wr->status;
2076 if (ret == IB_RMPP_RESULT_INTERNAL)
2077 ib_rmpp_send_handler(mad_send_wc);
2078 else
2079 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2080 mad_send_wc);
2081
2082 /* Release reference on agent taken when sending */
2083 deref_mad_agent(mad_agent_priv);
2084 return;
2085 done:
2086 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2087 }
2088
2089 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2090 struct ib_wc *wc)
2091 {
2092 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2093 struct ib_mad_list_head *mad_list;
2094 struct ib_mad_qp_info *qp_info;
2095 struct ib_mad_queue *send_queue;
2096 struct ib_send_wr *bad_send_wr;
2097 struct ib_mad_send_wc mad_send_wc;
2098 unsigned long flags;
2099 int ret;
2100
2101 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2102 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2103 mad_list);
2104 send_queue = mad_list->mad_queue;
2105 qp_info = send_queue->qp_info;
2106
2107 retry:
2108 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2109 mad_send_wr->header_mapping,
2110 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2111 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2112 mad_send_wr->payload_mapping,
2113 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2114 queued_send_wr = NULL;
2115 spin_lock_irqsave(&send_queue->lock, flags);
2116 list_del(&mad_list->list);
2117
2118 /* Move queued send to the send queue */
2119 if (send_queue->count-- > send_queue->max_active) {
2120 mad_list = container_of(qp_info->overflow_list.next,
2121 struct ib_mad_list_head, list);
2122 queued_send_wr = container_of(mad_list,
2123 struct ib_mad_send_wr_private,
2124 mad_list);
2125 list_move_tail(&mad_list->list, &send_queue->list);
2126 }
2127 spin_unlock_irqrestore(&send_queue->lock, flags);
2128
2129 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2130 mad_send_wc.status = wc->status;
2131 mad_send_wc.vendor_err = wc->vendor_err;
2132 if (atomic_read(&qp_info->snoop_count))
2133 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2134 IB_MAD_SNOOP_SEND_COMPLETIONS);
2135 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2136
2137 if (queued_send_wr) {
2138 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2139 &bad_send_wr);
2140 if (ret) {
2141 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2142 mad_send_wr = queued_send_wr;
2143 wc->status = IB_WC_LOC_QP_OP_ERR;
2144 goto retry;
2145 }
2146 }
2147 }
2148
2149 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2150 {
2151 struct ib_mad_send_wr_private *mad_send_wr;
2152 struct ib_mad_list_head *mad_list;
2153 unsigned long flags;
2154
2155 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2156 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2157 mad_send_wr = container_of(mad_list,
2158 struct ib_mad_send_wr_private,
2159 mad_list);
2160 mad_send_wr->retry = 1;
2161 }
2162 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2163 }
2164
2165 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2166 struct ib_wc *wc)
2167 {
2168 struct ib_mad_list_head *mad_list;
2169 struct ib_mad_qp_info *qp_info;
2170 struct ib_mad_send_wr_private *mad_send_wr;
2171 int ret;
2172
2173 /* Determine if failure was a send or receive */
2174 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2175 qp_info = mad_list->mad_queue->qp_info;
2176 if (mad_list->mad_queue == &qp_info->recv_queue)
2177 /*
2178 * Receive errors indicate that the QP has entered the error
2179 * state - error handling/shutdown code will cleanup
2180 */
2181 return;
2182
2183 /*
2184 * Send errors will transition the QP to SQE - move
2185 * QP to RTS and repost flushed work requests
2186 */
2187 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2188 mad_list);
2189 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2190 if (mad_send_wr->retry) {
2191 /* Repost send */
2192 struct ib_send_wr *bad_send_wr;
2193
2194 mad_send_wr->retry = 0;
2195 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2196 &bad_send_wr);
2197 if (ret)
2198 ib_mad_send_done_handler(port_priv, wc);
2199 } else
2200 ib_mad_send_done_handler(port_priv, wc);
2201 } else {
2202 struct ib_qp_attr *attr;
2203
2204 /* Transition QP to RTS and fail offending send */
2205 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2206 if (attr) {
2207 attr->qp_state = IB_QPS_RTS;
2208 attr->cur_qp_state = IB_QPS_SQE;
2209 ret = ib_modify_qp(qp_info->qp, attr,
2210 IB_QP_STATE | IB_QP_CUR_STATE);
2211 kfree(attr);
2212 if (ret)
2213 printk(KERN_ERR PFX "mad_error_handler - "
2214 "ib_modify_qp to RTS : %d\n", ret);
2215 else
2216 mark_sends_for_retry(qp_info);
2217 }
2218 ib_mad_send_done_handler(port_priv, wc);
2219 }
2220 }
2221
2222 /*
2223 * IB MAD completion callback
2224 */
2225 static void ib_mad_completion_handler(struct work_struct *work)
2226 {
2227 struct ib_mad_port_private *port_priv;
2228 struct ib_wc wc;
2229
2230 port_priv = container_of(work, struct ib_mad_port_private, work);
2231 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2232
2233 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2234 if (wc.status == IB_WC_SUCCESS) {
2235 switch (wc.opcode) {
2236 case IB_WC_SEND:
2237 ib_mad_send_done_handler(port_priv, &wc);
2238 break;
2239 case IB_WC_RECV:
2240 ib_mad_recv_done_handler(port_priv, &wc);
2241 break;
2242 default:
2243 BUG_ON(1);
2244 break;
2245 }
2246 } else
2247 mad_error_handler(port_priv, &wc);
2248 }
2249 }
2250
2251 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2252 {
2253 unsigned long flags;
2254 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2255 struct ib_mad_send_wc mad_send_wc;
2256 struct list_head cancel_list;
2257
2258 INIT_LIST_HEAD(&cancel_list);
2259
2260 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2261 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2262 &mad_agent_priv->send_list, agent_list) {
2263 if (mad_send_wr->status == IB_WC_SUCCESS) {
2264 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2265 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2266 }
2267 }
2268
2269 /* Empty wait list to prevent receives from finding a request */
2270 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2271 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2272
2273 /* Report all cancelled requests */
2274 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2275 mad_send_wc.vendor_err = 0;
2276
2277 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2278 &cancel_list, agent_list) {
2279 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2280 list_del(&mad_send_wr->agent_list);
2281 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2282 &mad_send_wc);
2283 atomic_dec(&mad_agent_priv->refcount);
2284 }
2285 }
2286
2287 static struct ib_mad_send_wr_private*
2288 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2289 struct ib_mad_send_buf *send_buf)
2290 {
2291 struct ib_mad_send_wr_private *mad_send_wr;
2292
2293 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2294 agent_list) {
2295 if (&mad_send_wr->send_buf == send_buf)
2296 return mad_send_wr;
2297 }
2298
2299 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2300 agent_list) {
2301 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2302 &mad_send_wr->send_buf == send_buf)
2303 return mad_send_wr;
2304 }
2305 return NULL;
2306 }
2307
2308 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2309 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2310 {
2311 struct ib_mad_agent_private *mad_agent_priv;
2312 struct ib_mad_send_wr_private *mad_send_wr;
2313 unsigned long flags;
2314 int active;
2315
2316 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2317 agent);
2318 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2319 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2320 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2321 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2322 return -EINVAL;
2323 }
2324
2325 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2326 if (!timeout_ms) {
2327 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2328 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2329 }
2330
2331 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2332 if (active)
2333 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2334 else
2335 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2336
2337 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2338 return 0;
2339 }
2340 EXPORT_SYMBOL(ib_modify_mad);
2341
2342 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2343 struct ib_mad_send_buf *send_buf)
2344 {
2345 ib_modify_mad(mad_agent, send_buf, 0);
2346 }
2347 EXPORT_SYMBOL(ib_cancel_mad);
2348
2349 static void local_completions(struct work_struct *work)
2350 {
2351 struct ib_mad_agent_private *mad_agent_priv;
2352 struct ib_mad_local_private *local;
2353 struct ib_mad_agent_private *recv_mad_agent;
2354 unsigned long flags;
2355 int free_mad;
2356 struct ib_wc wc;
2357 struct ib_mad_send_wc mad_send_wc;
2358
2359 mad_agent_priv =
2360 container_of(work, struct ib_mad_agent_private, local_work);
2361
2362 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2363 while (!list_empty(&mad_agent_priv->local_list)) {
2364 local = list_entry(mad_agent_priv->local_list.next,
2365 struct ib_mad_local_private,
2366 completion_list);
2367 list_del(&local->completion_list);
2368 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2369 free_mad = 0;
2370 if (local->mad_priv) {
2371 recv_mad_agent = local->recv_mad_agent;
2372 if (!recv_mad_agent) {
2373 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2374 free_mad = 1;
2375 goto local_send_completion;
2376 }
2377
2378 /*
2379 * Defined behavior is to complete response
2380 * before request
2381 */
2382 build_smp_wc(recv_mad_agent->agent.qp,
2383 (unsigned long) local->mad_send_wr,
2384 be16_to_cpu(IB_LID_PERMISSIVE),
2385 0, recv_mad_agent->agent.port_num, &wc);
2386
2387 local->mad_priv->header.recv_wc.wc = &wc;
2388 local->mad_priv->header.recv_wc.mad_len =
2389 sizeof(struct ib_mad);
2390 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2391 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2392 &local->mad_priv->header.recv_wc.rmpp_list);
2393 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2394 local->mad_priv->header.recv_wc.recv_buf.mad =
2395 &local->mad_priv->mad.mad;
2396 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2397 snoop_recv(recv_mad_agent->qp_info,
2398 &local->mad_priv->header.recv_wc,
2399 IB_MAD_SNOOP_RECVS);
2400 recv_mad_agent->agent.recv_handler(
2401 &recv_mad_agent->agent,
2402 &local->mad_priv->header.recv_wc);
2403 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2404 atomic_dec(&recv_mad_agent->refcount);
2405 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2406 }
2407
2408 local_send_completion:
2409 /* Complete send */
2410 mad_send_wc.status = IB_WC_SUCCESS;
2411 mad_send_wc.vendor_err = 0;
2412 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2413 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2414 snoop_send(mad_agent_priv->qp_info,
2415 &local->mad_send_wr->send_buf,
2416 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2417 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2418 &mad_send_wc);
2419
2420 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2421 atomic_dec(&mad_agent_priv->refcount);
2422 if (free_mad)
2423 kmem_cache_free(ib_mad_cache, local->mad_priv);
2424 kfree(local);
2425 }
2426 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2427 }
2428
2429 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2430 {
2431 int ret;
2432
2433 if (!mad_send_wr->retries_left)
2434 return -ETIMEDOUT;
2435
2436 mad_send_wr->retries_left--;
2437 mad_send_wr->send_buf.retries++;
2438
2439 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2440
2441 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2442 ret = ib_retry_rmpp(mad_send_wr);
2443 switch (ret) {
2444 case IB_RMPP_RESULT_UNHANDLED:
2445 ret = ib_send_mad(mad_send_wr);
2446 break;
2447 case IB_RMPP_RESULT_CONSUMED:
2448 ret = 0;
2449 break;
2450 default:
2451 ret = -ECOMM;
2452 break;
2453 }
2454 } else
2455 ret = ib_send_mad(mad_send_wr);
2456
2457 if (!ret) {
2458 mad_send_wr->refcount++;
2459 list_add_tail(&mad_send_wr->agent_list,
2460 &mad_send_wr->mad_agent_priv->send_list);
2461 }
2462 return ret;
2463 }
2464
2465 static void timeout_sends(struct work_struct *work)
2466 {
2467 struct ib_mad_agent_private *mad_agent_priv;
2468 struct ib_mad_send_wr_private *mad_send_wr;
2469 struct ib_mad_send_wc mad_send_wc;
2470 unsigned long flags, delay;
2471
2472 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2473 timed_work.work);
2474 mad_send_wc.vendor_err = 0;
2475
2476 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2477 while (!list_empty(&mad_agent_priv->wait_list)) {
2478 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2479 struct ib_mad_send_wr_private,
2480 agent_list);
2481
2482 if (time_after(mad_send_wr->timeout, jiffies)) {
2483 delay = mad_send_wr->timeout - jiffies;
2484 if ((long)delay <= 0)
2485 delay = 1;
2486 queue_delayed_work(mad_agent_priv->qp_info->
2487 port_priv->wq,
2488 &mad_agent_priv->timed_work, delay);
2489 break;
2490 }
2491
2492 list_del(&mad_send_wr->agent_list);
2493 if (mad_send_wr->status == IB_WC_SUCCESS &&
2494 !retry_send(mad_send_wr))
2495 continue;
2496
2497 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2498
2499 if (mad_send_wr->status == IB_WC_SUCCESS)
2500 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2501 else
2502 mad_send_wc.status = mad_send_wr->status;
2503 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2504 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2505 &mad_send_wc);
2506
2507 atomic_dec(&mad_agent_priv->refcount);
2508 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2509 }
2510 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2511 }
2512
2513 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2514 {
2515 struct ib_mad_port_private *port_priv = cq->cq_context;
2516 unsigned long flags;
2517
2518 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2519 if (!list_empty(&port_priv->port_list))
2520 queue_work(port_priv->wq, &port_priv->work);
2521 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2522 }
2523
2524 /*
2525 * Allocate receive MADs and post receive WRs for them
2526 */
2527 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2528 struct ib_mad_private *mad)
2529 {
2530 unsigned long flags;
2531 int post, ret;
2532 struct ib_mad_private *mad_priv;
2533 struct ib_sge sg_list;
2534 struct ib_recv_wr recv_wr, *bad_recv_wr;
2535 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2536
2537 /* Initialize common scatter list fields */
2538 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2539 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2540
2541 /* Initialize common receive WR fields */
2542 recv_wr.next = NULL;
2543 recv_wr.sg_list = &sg_list;
2544 recv_wr.num_sge = 1;
2545
2546 do {
2547 /* Allocate and map receive buffer */
2548 if (mad) {
2549 mad_priv = mad;
2550 mad = NULL;
2551 } else {
2552 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2553 if (!mad_priv) {
2554 printk(KERN_ERR PFX "No memory for receive buffer\n");
2555 ret = -ENOMEM;
2556 break;
2557 }
2558 }
2559 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2560 &mad_priv->grh,
2561 sizeof *mad_priv -
2562 sizeof mad_priv->header,
2563 DMA_FROM_DEVICE);
2564 mad_priv->header.mapping = sg_list.addr;
2565 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2566 mad_priv->header.mad_list.mad_queue = recv_queue;
2567
2568 /* Post receive WR */
2569 spin_lock_irqsave(&recv_queue->lock, flags);
2570 post = (++recv_queue->count < recv_queue->max_active);
2571 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2572 spin_unlock_irqrestore(&recv_queue->lock, flags);
2573 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2574 if (ret) {
2575 spin_lock_irqsave(&recv_queue->lock, flags);
2576 list_del(&mad_priv->header.mad_list.list);
2577 recv_queue->count--;
2578 spin_unlock_irqrestore(&recv_queue->lock, flags);
2579 ib_dma_unmap_single(qp_info->port_priv->device,
2580 mad_priv->header.mapping,
2581 sizeof *mad_priv -
2582 sizeof mad_priv->header,
2583 DMA_FROM_DEVICE);
2584 kmem_cache_free(ib_mad_cache, mad_priv);
2585 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2586 break;
2587 }
2588 } while (post);
2589
2590 return ret;
2591 }
2592
2593 /*
2594 * Return all the posted receive MADs
2595 */
2596 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2597 {
2598 struct ib_mad_private_header *mad_priv_hdr;
2599 struct ib_mad_private *recv;
2600 struct ib_mad_list_head *mad_list;
2601
2602 while (!list_empty(&qp_info->recv_queue.list)) {
2603
2604 mad_list = list_entry(qp_info->recv_queue.list.next,
2605 struct ib_mad_list_head, list);
2606 mad_priv_hdr = container_of(mad_list,
2607 struct ib_mad_private_header,
2608 mad_list);
2609 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2610 header);
2611
2612 /* Remove from posted receive MAD list */
2613 list_del(&mad_list->list);
2614
2615 ib_dma_unmap_single(qp_info->port_priv->device,
2616 recv->header.mapping,
2617 sizeof(struct ib_mad_private) -
2618 sizeof(struct ib_mad_private_header),
2619 DMA_FROM_DEVICE);
2620 kmem_cache_free(ib_mad_cache, recv);
2621 }
2622
2623 qp_info->recv_queue.count = 0;
2624 }
2625
2626 /*
2627 * Start the port
2628 */
2629 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2630 {
2631 int ret, i;
2632 struct ib_qp_attr *attr;
2633 struct ib_qp *qp;
2634
2635 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2636 if (!attr) {
2637 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2638 return -ENOMEM;
2639 }
2640
2641 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2642 qp = port_priv->qp_info[i].qp;
2643 /*
2644 * PKey index for QP1 is irrelevant but
2645 * one is needed for the Reset to Init transition
2646 */
2647 attr->qp_state = IB_QPS_INIT;
2648 attr->pkey_index = 0;
2649 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2650 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2651 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2652 if (ret) {
2653 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2654 "INIT: %d\n", i, ret);
2655 goto out;
2656 }
2657
2658 attr->qp_state = IB_QPS_RTR;
2659 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2660 if (ret) {
2661 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2662 "RTR: %d\n", i, ret);
2663 goto out;
2664 }
2665
2666 attr->qp_state = IB_QPS_RTS;
2667 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2668 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2669 if (ret) {
2670 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2671 "RTS: %d\n", i, ret);
2672 goto out;
2673 }
2674 }
2675
2676 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2677 if (ret) {
2678 printk(KERN_ERR PFX "Failed to request completion "
2679 "notification: %d\n", ret);
2680 goto out;
2681 }
2682
2683 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2684 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2685 if (ret) {
2686 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2687 goto out;
2688 }
2689 }
2690 out:
2691 kfree(attr);
2692 return ret;
2693 }
2694
2695 static void qp_event_handler(struct ib_event *event, void *qp_context)
2696 {
2697 struct ib_mad_qp_info *qp_info = qp_context;
2698
2699 /* It's worse than that! He's dead, Jim! */
2700 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2701 event->event, qp_info->qp->qp_num);
2702 }
2703
2704 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2705 struct ib_mad_queue *mad_queue)
2706 {
2707 mad_queue->qp_info = qp_info;
2708 mad_queue->count = 0;
2709 spin_lock_init(&mad_queue->lock);
2710 INIT_LIST_HEAD(&mad_queue->list);
2711 }
2712
2713 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2714 struct ib_mad_qp_info *qp_info)
2715 {
2716 qp_info->port_priv = port_priv;
2717 init_mad_queue(qp_info, &qp_info->send_queue);
2718 init_mad_queue(qp_info, &qp_info->recv_queue);
2719 INIT_LIST_HEAD(&qp_info->overflow_list);
2720 spin_lock_init(&qp_info->snoop_lock);
2721 qp_info->snoop_table = NULL;
2722 qp_info->snoop_table_size = 0;
2723 atomic_set(&qp_info->snoop_count, 0);
2724 }
2725
2726 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2727 enum ib_qp_type qp_type)
2728 {
2729 struct ib_qp_init_attr qp_init_attr;
2730 int ret;
2731
2732 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2733 qp_init_attr.send_cq = qp_info->port_priv->cq;
2734 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2735 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2736 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2737 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2738 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2739 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2740 qp_init_attr.qp_type = qp_type;
2741 qp_init_attr.port_num = qp_info->port_priv->port_num;
2742 qp_init_attr.qp_context = qp_info;
2743 qp_init_attr.event_handler = qp_event_handler;
2744 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2745 if (IS_ERR(qp_info->qp)) {
2746 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2747 get_spl_qp_index(qp_type));
2748 ret = PTR_ERR(qp_info->qp);
2749 goto error;
2750 }
2751 /* Use minimum queue sizes unless the CQ is resized */
2752 qp_info->send_queue.max_active = mad_sendq_size;
2753 qp_info->recv_queue.max_active = mad_recvq_size;
2754 return 0;
2755
2756 error:
2757 return ret;
2758 }
2759
2760 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2761 {
2762 ib_destroy_qp(qp_info->qp);
2763 kfree(qp_info->snoop_table);
2764 }
2765
2766 /*
2767 * Open the port
2768 * Create the QP, PD, MR, and CQ if needed
2769 */
2770 static int ib_mad_port_open(struct ib_device *device,
2771 int port_num)
2772 {
2773 int ret, cq_size;
2774 struct ib_mad_port_private *port_priv;
2775 unsigned long flags;
2776 char name[sizeof "ib_mad123"];
2777
2778 /* Create new device info */
2779 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2780 if (!port_priv) {
2781 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2782 return -ENOMEM;
2783 }
2784
2785 port_priv->device = device;
2786 port_priv->port_num = port_num;
2787 spin_lock_init(&port_priv->reg_lock);
2788 INIT_LIST_HEAD(&port_priv->agent_list);
2789 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2790 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2791
2792 cq_size = (mad_sendq_size + mad_recvq_size) * 2;
2793 port_priv->cq = ib_create_cq(port_priv->device,
2794 ib_mad_thread_completion_handler,
2795 NULL, port_priv, cq_size, 0);
2796 if (IS_ERR(port_priv->cq)) {
2797 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2798 ret = PTR_ERR(port_priv->cq);
2799 goto error3;
2800 }
2801
2802 port_priv->pd = ib_alloc_pd(device);
2803 if (IS_ERR(port_priv->pd)) {
2804 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2805 ret = PTR_ERR(port_priv->pd);
2806 goto error4;
2807 }
2808
2809 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2810 if (IS_ERR(port_priv->mr)) {
2811 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2812 ret = PTR_ERR(port_priv->mr);
2813 goto error5;
2814 }
2815
2816 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2817 if (ret)
2818 goto error6;
2819 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2820 if (ret)
2821 goto error7;
2822
2823 snprintf(name, sizeof name, "ib_mad%d", port_num);
2824 port_priv->wq = create_singlethread_workqueue(name);
2825 if (!port_priv->wq) {
2826 ret = -ENOMEM;
2827 goto error8;
2828 }
2829 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2830
2831 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2832 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2833 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2834
2835 ret = ib_mad_port_start(port_priv);
2836 if (ret) {
2837 printk(KERN_ERR PFX "Couldn't start port\n");
2838 goto error9;
2839 }
2840
2841 return 0;
2842
2843 error9:
2844 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2845 list_del_init(&port_priv->port_list);
2846 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2847
2848 destroy_workqueue(port_priv->wq);
2849 error8:
2850 destroy_mad_qp(&port_priv->qp_info[1]);
2851 error7:
2852 destroy_mad_qp(&port_priv->qp_info[0]);
2853 error6:
2854 ib_dereg_mr(port_priv->mr);
2855 error5:
2856 ib_dealloc_pd(port_priv->pd);
2857 error4:
2858 ib_destroy_cq(port_priv->cq);
2859 cleanup_recv_queue(&port_priv->qp_info[1]);
2860 cleanup_recv_queue(&port_priv->qp_info[0]);
2861 error3:
2862 kfree(port_priv);
2863
2864 return ret;
2865 }
2866
2867 /*
2868 * Close the port
2869 * If there are no classes using the port, free the port
2870 * resources (CQ, MR, PD, QP) and remove the port's info structure
2871 */
2872 static int ib_mad_port_close(struct ib_device *device, int port_num)
2873 {
2874 struct ib_mad_port_private *port_priv;
2875 unsigned long flags;
2876
2877 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2878 port_priv = __ib_get_mad_port(device, port_num);
2879 if (port_priv == NULL) {
2880 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2881 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2882 return -ENODEV;
2883 }
2884 list_del_init(&port_priv->port_list);
2885 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2886
2887 destroy_workqueue(port_priv->wq);
2888 destroy_mad_qp(&port_priv->qp_info[1]);
2889 destroy_mad_qp(&port_priv->qp_info[0]);
2890 ib_dereg_mr(port_priv->mr);
2891 ib_dealloc_pd(port_priv->pd);
2892 ib_destroy_cq(port_priv->cq);
2893 cleanup_recv_queue(&port_priv->qp_info[1]);
2894 cleanup_recv_queue(&port_priv->qp_info[0]);
2895 /* XXX: Handle deallocation of MAD registration tables */
2896
2897 kfree(port_priv);
2898
2899 return 0;
2900 }
2901
2902 static void ib_mad_init_device(struct ib_device *device)
2903 {
2904 int start, end, i;
2905
2906 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2907 return;
2908
2909 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2910 start = 0;
2911 end = 0;
2912 } else {
2913 start = 1;
2914 end = device->phys_port_cnt;
2915 }
2916
2917 for (i = start; i <= end; i++) {
2918 if (ib_mad_port_open(device, i)) {
2919 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2920 device->name, i);
2921 goto error;
2922 }
2923 if (ib_agent_port_open(device, i)) {
2924 printk(KERN_ERR PFX "Couldn't open %s port %d "
2925 "for agents\n",
2926 device->name, i);
2927 goto error_agent;
2928 }
2929 }
2930 return;
2931
2932 error_agent:
2933 if (ib_mad_port_close(device, i))
2934 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2935 device->name, i);
2936
2937 error:
2938 i--;
2939
2940 while (i >= start) {
2941 if (ib_agent_port_close(device, i))
2942 printk(KERN_ERR PFX "Couldn't close %s port %d "
2943 "for agents\n",
2944 device->name, i);
2945 if (ib_mad_port_close(device, i))
2946 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2947 device->name, i);
2948 i--;
2949 }
2950 }
2951
2952 static void ib_mad_remove_device(struct ib_device *device)
2953 {
2954 int i, num_ports, cur_port;
2955
2956 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2957 return;
2958
2959 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2960 num_ports = 1;
2961 cur_port = 0;
2962 } else {
2963 num_ports = device->phys_port_cnt;
2964 cur_port = 1;
2965 }
2966 for (i = 0; i < num_ports; i++, cur_port++) {
2967 if (ib_agent_port_close(device, cur_port))
2968 printk(KERN_ERR PFX "Couldn't close %s port %d "
2969 "for agents\n",
2970 device->name, cur_port);
2971 if (ib_mad_port_close(device, cur_port))
2972 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2973 device->name, cur_port);
2974 }
2975 }
2976
2977 static struct ib_client mad_client = {
2978 .name = "mad",
2979 .add = ib_mad_init_device,
2980 .remove = ib_mad_remove_device
2981 };
2982
2983 static int __init ib_mad_init_module(void)
2984 {
2985 int ret;
2986
2987 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
2988 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
2989
2990 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
2991 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
2992
2993 ib_mad_cache = kmem_cache_create("ib_mad",
2994 sizeof(struct ib_mad_private),
2995 0,
2996 SLAB_HWCACHE_ALIGN,
2997 NULL);
2998 if (!ib_mad_cache) {
2999 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3000 ret = -ENOMEM;
3001 goto error1;
3002 }
3003
3004 INIT_LIST_HEAD(&ib_mad_port_list);
3005
3006 if (ib_register_client(&mad_client)) {
3007 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3008 ret = -EINVAL;
3009 goto error2;
3010 }
3011
3012 return 0;
3013
3014 error2:
3015 kmem_cache_destroy(ib_mad_cache);
3016 error1:
3017 return ret;
3018 }
3019
3020 static void __exit ib_mad_cleanup_module(void)
3021 {
3022 ib_unregister_client(&mad_client);
3023 kmem_cache_destroy(ib_mad_cache);
3024 }
3025
3026 module_init(ib_mad_init_module);
3027 module_exit(ib_mad_cleanup_module);
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