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Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / infiniband / core / mad.c
blob1df1194aeba420d7288e47a4225dde559259f563
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 <linux/slab.h>
38 #include <rdma/ib_cache.h>
39
40 #include "mad_priv.h"
41 #include "mad_rmpp.h"
42 #include "smi.h"
43 #include "agent.h"
44
45 MODULE_LICENSE("Dual BSD/GPL");
46 MODULE_DESCRIPTION("kernel IB MAD API");
47 MODULE_AUTHOR("Hal Rosenstock");
48 MODULE_AUTHOR("Sean Hefty");
49
50 int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
51 int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
52
53 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
54 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
55 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
56 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
57
58 static struct kmem_cache *ib_mad_cache;
59
60 static struct list_head ib_mad_port_list;
61 static u32 ib_mad_client_id = 0;
62
63 /* Port list lock */
64 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
65
66 /* Forward declarations */
67 static int method_in_use(struct ib_mad_mgmt_method_table **method,
68 struct ib_mad_reg_req *mad_reg_req);
69 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
70 static struct ib_mad_agent_private *find_mad_agent(
71 struct ib_mad_port_private *port_priv,
72 struct ib_mad *mad);
73 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
74 struct ib_mad_private *mad);
75 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
76 static void timeout_sends(struct work_struct *work);
77 static void local_completions(struct work_struct *work);
78 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
79 struct ib_mad_agent_private *agent_priv,
80 u8 mgmt_class);
81 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
82 struct ib_mad_agent_private *agent_priv);
83
84 /*
85 * Returns a ib_mad_port_private structure or NULL for a device/port
86 * Assumes ib_mad_port_list_lock is being held
87 */
88 static inline struct ib_mad_port_private *
89 __ib_get_mad_port(struct ib_device *device, int port_num)
90 {
91 struct ib_mad_port_private *entry;
92
93 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
94 if (entry->device == device && entry->port_num == port_num)
95 return entry;
96 }
97 return NULL;
98 }
99
100 /*
101 * Wrapper function to return a ib_mad_port_private structure or NULL
102 * for a device/port
103 */
104 static inline struct ib_mad_port_private *
105 ib_get_mad_port(struct ib_device *device, int port_num)
106 {
107 struct ib_mad_port_private *entry;
108 unsigned long flags;
109
110 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
111 entry = __ib_get_mad_port(device, port_num);
112 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
113
114 return entry;
115 }
116
117 static inline u8 convert_mgmt_class(u8 mgmt_class)
118 {
119 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
120 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
121 0 : mgmt_class;
122 }
123
124 static int get_spl_qp_index(enum ib_qp_type qp_type)
125 {
126 switch (qp_type)
127 {
128 case IB_QPT_SMI:
129 return 0;
130 case IB_QPT_GSI:
131 return 1;
132 default:
133 return -1;
134 }
135 }
136
137 static int vendor_class_index(u8 mgmt_class)
138 {
139 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
140 }
141
142 static int is_vendor_class(u8 mgmt_class)
143 {
144 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
145 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
146 return 0;
147 return 1;
148 }
149
150 static int is_vendor_oui(char *oui)
151 {
152 if (oui[0] || oui[1] || oui[2])
153 return 1;
154 return 0;
155 }
156
157 static int is_vendor_method_in_use(
158 struct ib_mad_mgmt_vendor_class *vendor_class,
159 struct ib_mad_reg_req *mad_reg_req)
160 {
161 struct ib_mad_mgmt_method_table *method;
162 int i;
163
164 for (i = 0; i < MAX_MGMT_OUI; i++) {
165 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
166 method = vendor_class->method_table[i];
167 if (method) {
168 if (method_in_use(&method, mad_reg_req))
169 return 1;
170 else
171 break;
172 }
173 }
174 }
175 return 0;
176 }
177
178 int ib_response_mad(struct ib_mad *mad)
179 {
180 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
181 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
182 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
183 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
184 }
185 EXPORT_SYMBOL(ib_response_mad);
186
187 /*
188 * ib_register_mad_agent - Register to send/receive MADs
189 */
190 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
191 u8 port_num,
192 enum ib_qp_type qp_type,
193 struct ib_mad_reg_req *mad_reg_req,
194 u8 rmpp_version,
195 ib_mad_send_handler send_handler,
196 ib_mad_recv_handler recv_handler,
197 void *context)
198 {
199 struct ib_mad_port_private *port_priv;
200 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
201 struct ib_mad_agent_private *mad_agent_priv;
202 struct ib_mad_reg_req *reg_req = NULL;
203 struct ib_mad_mgmt_class_table *class;
204 struct ib_mad_mgmt_vendor_class_table *vendor;
205 struct ib_mad_mgmt_vendor_class *vendor_class;
206 struct ib_mad_mgmt_method_table *method;
207 int ret2, qpn;
208 unsigned long flags;
209 u8 mgmt_class, vclass;
210
211 /* Validate parameters */
212 qpn = get_spl_qp_index(qp_type);
213 if (qpn == -1)
214 goto error1;
215
216 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
217 goto error1;
218
219 /* Validate MAD registration request if supplied */
220 if (mad_reg_req) {
221 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
222 goto error1;
223 if (!recv_handler)
224 goto error1;
225 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
226 /*
227 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
228 * one in this range currently allowed
229 */
230 if (mad_reg_req->mgmt_class !=
231 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
232 goto error1;
233 } else if (mad_reg_req->mgmt_class == 0) {
234 /*
235 * Class 0 is reserved in IBA and is used for
236 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
237 */
238 goto error1;
239 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
240 /*
241 * If class is in "new" vendor range,
242 * ensure supplied OUI is not zero
243 */
244 if (!is_vendor_oui(mad_reg_req->oui))
245 goto error1;
246 }
247 /* Make sure class supplied is consistent with RMPP */
248 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
249 if (rmpp_version)
250 goto error1;
251 }
252 /* Make sure class supplied is consistent with QP type */
253 if (qp_type == IB_QPT_SMI) {
254 if ((mad_reg_req->mgmt_class !=
255 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
256 (mad_reg_req->mgmt_class !=
257 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
258 goto error1;
259 } else {
260 if ((mad_reg_req->mgmt_class ==
261 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
262 (mad_reg_req->mgmt_class ==
263 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
264 goto error1;
265 }
266 } else {
267 /* No registration request supplied */
268 if (!send_handler)
269 goto error1;
270 }
271
272 /* Validate device and port */
273 port_priv = ib_get_mad_port(device, port_num);
274 if (!port_priv) {
275 ret = ERR_PTR(-ENODEV);
276 goto error1;
277 }
278
279 /* Allocate structures */
280 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
281 if (!mad_agent_priv) {
282 ret = ERR_PTR(-ENOMEM);
283 goto error1;
284 }
285
286 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
287 IB_ACCESS_LOCAL_WRITE);
288 if (IS_ERR(mad_agent_priv->agent.mr)) {
289 ret = ERR_PTR(-ENOMEM);
290 goto error2;
291 }
292
293 if (mad_reg_req) {
294 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
295 if (!reg_req) {
296 ret = ERR_PTR(-ENOMEM);
297 goto error3;
298 }
299 /* Make a copy of the MAD registration request */
300 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
301 }
302
303 /* Now, fill in the various structures */
304 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
305 mad_agent_priv->reg_req = reg_req;
306 mad_agent_priv->agent.rmpp_version = rmpp_version;
307 mad_agent_priv->agent.device = device;
308 mad_agent_priv->agent.recv_handler = recv_handler;
309 mad_agent_priv->agent.send_handler = send_handler;
310 mad_agent_priv->agent.context = context;
311 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
312 mad_agent_priv->agent.port_num = port_num;
313 spin_lock_init(&mad_agent_priv->lock);
314 INIT_LIST_HEAD(&mad_agent_priv->send_list);
315 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
316 INIT_LIST_HEAD(&mad_agent_priv->done_list);
317 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
318 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
319 INIT_LIST_HEAD(&mad_agent_priv->local_list);
320 INIT_WORK(&mad_agent_priv->local_work, local_completions);
321 atomic_set(&mad_agent_priv->refcount, 1);
322 init_completion(&mad_agent_priv->comp);
323
324 spin_lock_irqsave(&port_priv->reg_lock, flags);
325 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
326
327 /*
328 * Make sure MAD registration (if supplied)
329 * is non overlapping with any existing ones
330 */
331 if (mad_reg_req) {
332 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
333 if (!is_vendor_class(mgmt_class)) {
334 class = port_priv->version[mad_reg_req->
335 mgmt_class_version].class;
336 if (class) {
337 method = class->method_table[mgmt_class];
338 if (method) {
339 if (method_in_use(&method,
340 mad_reg_req))
341 goto error4;
342 }
343 }
344 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
345 mgmt_class);
346 } else {
347 /* "New" vendor class range */
348 vendor = port_priv->version[mad_reg_req->
349 mgmt_class_version].vendor;
350 if (vendor) {
351 vclass = vendor_class_index(mgmt_class);
352 vendor_class = vendor->vendor_class[vclass];
353 if (vendor_class) {
354 if (is_vendor_method_in_use(
355 vendor_class,
356 mad_reg_req))
357 goto error4;
358 }
359 }
360 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
361 }
362 if (ret2) {
363 ret = ERR_PTR(ret2);
364 goto error4;
365 }
366 }
367
368 /* Add mad agent into port's agent list */
369 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
370 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
371
372 return &mad_agent_priv->agent;
373
374 error4:
375 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
376 kfree(reg_req);
377 error3:
378 ib_dereg_mr(mad_agent_priv->agent.mr);
379 error2:
380 kfree(mad_agent_priv);
381 error1:
382 return ret;
383 }
384 EXPORT_SYMBOL(ib_register_mad_agent);
385
386 static inline int is_snooping_sends(int mad_snoop_flags)
387 {
388 return (mad_snoop_flags &
389 (/*IB_MAD_SNOOP_POSTED_SENDS |
390 IB_MAD_SNOOP_RMPP_SENDS |*/
391 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
392 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
393 }
394
395 static inline int is_snooping_recvs(int mad_snoop_flags)
396 {
397 return (mad_snoop_flags &
398 (IB_MAD_SNOOP_RECVS /*|
399 IB_MAD_SNOOP_RMPP_RECVS*/));
400 }
401
402 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
403 struct ib_mad_snoop_private *mad_snoop_priv)
404 {
405 struct ib_mad_snoop_private **new_snoop_table;
406 unsigned long flags;
407 int i;
408
409 spin_lock_irqsave(&qp_info->snoop_lock, flags);
410 /* Check for empty slot in array. */
411 for (i = 0; i < qp_info->snoop_table_size; i++)
412 if (!qp_info->snoop_table[i])
413 break;
414
415 if (i == qp_info->snoop_table_size) {
416 /* Grow table. */
417 new_snoop_table = krealloc(qp_info->snoop_table,
418 sizeof mad_snoop_priv *
419 (qp_info->snoop_table_size + 1),
420 GFP_ATOMIC);
421 if (!new_snoop_table) {
422 i = -ENOMEM;
423 goto out;
424 }
425
426 qp_info->snoop_table = new_snoop_table;
427 qp_info->snoop_table_size++;
428 }
429 qp_info->snoop_table[i] = mad_snoop_priv;
430 atomic_inc(&qp_info->snoop_count);
431 out:
432 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
433 return i;
434 }
435
436 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
437 u8 port_num,
438 enum ib_qp_type qp_type,
439 int mad_snoop_flags,
440 ib_mad_snoop_handler snoop_handler,
441 ib_mad_recv_handler recv_handler,
442 void *context)
443 {
444 struct ib_mad_port_private *port_priv;
445 struct ib_mad_agent *ret;
446 struct ib_mad_snoop_private *mad_snoop_priv;
447 int qpn;
448
449 /* Validate parameters */
450 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
451 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
452 ret = ERR_PTR(-EINVAL);
453 goto error1;
454 }
455 qpn = get_spl_qp_index(qp_type);
456 if (qpn == -1) {
457 ret = ERR_PTR(-EINVAL);
458 goto error1;
459 }
460 port_priv = ib_get_mad_port(device, port_num);
461 if (!port_priv) {
462 ret = ERR_PTR(-ENODEV);
463 goto error1;
464 }
465 /* Allocate structures */
466 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
467 if (!mad_snoop_priv) {
468 ret = ERR_PTR(-ENOMEM);
469 goto error1;
470 }
471
472 /* Now, fill in the various structures */
473 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
474 mad_snoop_priv->agent.device = device;
475 mad_snoop_priv->agent.recv_handler = recv_handler;
476 mad_snoop_priv->agent.snoop_handler = snoop_handler;
477 mad_snoop_priv->agent.context = context;
478 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
479 mad_snoop_priv->agent.port_num = port_num;
480 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
481 init_completion(&mad_snoop_priv->comp);
482 mad_snoop_priv->snoop_index = register_snoop_agent(
483 &port_priv->qp_info[qpn],
484 mad_snoop_priv);
485 if (mad_snoop_priv->snoop_index < 0) {
486 ret = ERR_PTR(mad_snoop_priv->snoop_index);
487 goto error2;
488 }
489
490 atomic_set(&mad_snoop_priv->refcount, 1);
491 return &mad_snoop_priv->agent;
492
493 error2:
494 kfree(mad_snoop_priv);
495 error1:
496 return ret;
497 }
498 EXPORT_SYMBOL(ib_register_mad_snoop);
499
500 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
501 {
502 if (atomic_dec_and_test(&mad_agent_priv->refcount))
503 complete(&mad_agent_priv->comp);
504 }
505
506 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
507 {
508 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
509 complete(&mad_snoop_priv->comp);
510 }
511
512 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
513 {
514 struct ib_mad_port_private *port_priv;
515 unsigned long flags;
516
517 /* Note that we could still be handling received MADs */
518
519 /*
520 * Canceling all sends results in dropping received response
521 * MADs, preventing us from queuing additional work
522 */
523 cancel_mads(mad_agent_priv);
524 port_priv = mad_agent_priv->qp_info->port_priv;
525 cancel_delayed_work(&mad_agent_priv->timed_work);
526
527 spin_lock_irqsave(&port_priv->reg_lock, flags);
528 remove_mad_reg_req(mad_agent_priv);
529 list_del(&mad_agent_priv->agent_list);
530 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
531
532 flush_workqueue(port_priv->wq);
533 ib_cancel_rmpp_recvs(mad_agent_priv);
534
535 deref_mad_agent(mad_agent_priv);
536 wait_for_completion(&mad_agent_priv->comp);
537
538 kfree(mad_agent_priv->reg_req);
539 ib_dereg_mr(mad_agent_priv->agent.mr);
540 kfree(mad_agent_priv);
541 }
542
543 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
544 {
545 struct ib_mad_qp_info *qp_info;
546 unsigned long flags;
547
548 qp_info = mad_snoop_priv->qp_info;
549 spin_lock_irqsave(&qp_info->snoop_lock, flags);
550 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
551 atomic_dec(&qp_info->snoop_count);
552 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
553
554 deref_snoop_agent(mad_snoop_priv);
555 wait_for_completion(&mad_snoop_priv->comp);
556
557 kfree(mad_snoop_priv);
558 }
559
560 /*
561 * ib_unregister_mad_agent - Unregisters a client from using MAD services
562 */
563 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
564 {
565 struct ib_mad_agent_private *mad_agent_priv;
566 struct ib_mad_snoop_private *mad_snoop_priv;
567
568 /* If the TID is zero, the agent can only snoop. */
569 if (mad_agent->hi_tid) {
570 mad_agent_priv = container_of(mad_agent,
571 struct ib_mad_agent_private,
572 agent);
573 unregister_mad_agent(mad_agent_priv);
574 } else {
575 mad_snoop_priv = container_of(mad_agent,
576 struct ib_mad_snoop_private,
577 agent);
578 unregister_mad_snoop(mad_snoop_priv);
579 }
580 return 0;
581 }
582 EXPORT_SYMBOL(ib_unregister_mad_agent);
583
584 static void dequeue_mad(struct ib_mad_list_head *mad_list)
585 {
586 struct ib_mad_queue *mad_queue;
587 unsigned long flags;
588
589 BUG_ON(!mad_list->mad_queue);
590 mad_queue = mad_list->mad_queue;
591 spin_lock_irqsave(&mad_queue->lock, flags);
592 list_del(&mad_list->list);
593 mad_queue->count--;
594 spin_unlock_irqrestore(&mad_queue->lock, flags);
595 }
596
597 static void snoop_send(struct ib_mad_qp_info *qp_info,
598 struct ib_mad_send_buf *send_buf,
599 struct ib_mad_send_wc *mad_send_wc,
600 int mad_snoop_flags)
601 {
602 struct ib_mad_snoop_private *mad_snoop_priv;
603 unsigned long flags;
604 int i;
605
606 spin_lock_irqsave(&qp_info->snoop_lock, flags);
607 for (i = 0; i < qp_info->snoop_table_size; i++) {
608 mad_snoop_priv = qp_info->snoop_table[i];
609 if (!mad_snoop_priv ||
610 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
611 continue;
612
613 atomic_inc(&mad_snoop_priv->refcount);
614 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
615 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
616 send_buf, mad_send_wc);
617 deref_snoop_agent(mad_snoop_priv);
618 spin_lock_irqsave(&qp_info->snoop_lock, flags);
619 }
620 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
621 }
622
623 static void snoop_recv(struct ib_mad_qp_info *qp_info,
624 struct ib_mad_recv_wc *mad_recv_wc,
625 int mad_snoop_flags)
626 {
627 struct ib_mad_snoop_private *mad_snoop_priv;
628 unsigned long flags;
629 int i;
630
631 spin_lock_irqsave(&qp_info->snoop_lock, flags);
632 for (i = 0; i < qp_info->snoop_table_size; i++) {
633 mad_snoop_priv = qp_info->snoop_table[i];
634 if (!mad_snoop_priv ||
635 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
636 continue;
637
638 atomic_inc(&mad_snoop_priv->refcount);
639 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
640 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
641 mad_recv_wc);
642 deref_snoop_agent(mad_snoop_priv);
643 spin_lock_irqsave(&qp_info->snoop_lock, flags);
644 }
645 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
646 }
647
648 static void build_smp_wc(struct ib_qp *qp,
649 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
650 struct ib_wc *wc)
651 {
652 memset(wc, 0, sizeof *wc);
653 wc->wr_id = wr_id;
654 wc->status = IB_WC_SUCCESS;
655 wc->opcode = IB_WC_RECV;
656 wc->pkey_index = pkey_index;
657 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
658 wc->src_qp = IB_QP0;
659 wc->qp = qp;
660 wc->slid = slid;
661 wc->sl = 0;
662 wc->dlid_path_bits = 0;
663 wc->port_num = port_num;
664 }
665
666 /*
667 * Return 0 if SMP is to be sent
668 * Return 1 if SMP was consumed locally (whether or not solicited)
669 * Return < 0 if error
670 */
671 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
672 struct ib_mad_send_wr_private *mad_send_wr)
673 {
674 int ret = 0;
675 struct ib_smp *smp = mad_send_wr->send_buf.mad;
676 unsigned long flags;
677 struct ib_mad_local_private *local;
678 struct ib_mad_private *mad_priv;
679 struct ib_mad_port_private *port_priv;
680 struct ib_mad_agent_private *recv_mad_agent = NULL;
681 struct ib_device *device = mad_agent_priv->agent.device;
682 u8 port_num;
683 struct ib_wc mad_wc;
684 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
685
686 if (device->node_type == RDMA_NODE_IB_SWITCH &&
687 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
688 port_num = send_wr->wr.ud.port_num;
689 else
690 port_num = mad_agent_priv->agent.port_num;
691
692 /*
693 * Directed route handling starts if the initial LID routed part of
694 * a request or the ending LID routed part of a response is empty.
695 * If we are at the start of the LID routed part, don't update the
696 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
697 */
698 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
699 IB_LID_PERMISSIVE &&
700 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
701 IB_SMI_DISCARD) {
702 ret = -EINVAL;
703 printk(KERN_ERR PFX "Invalid directed route\n");
704 goto out;
705 }
706
707 /* Check to post send on QP or process locally */
708 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
709 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
710 goto out;
711
712 local = kmalloc(sizeof *local, GFP_ATOMIC);
713 if (!local) {
714 ret = -ENOMEM;
715 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
716 goto out;
717 }
718 local->mad_priv = NULL;
719 local->recv_mad_agent = NULL;
720 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
721 if (!mad_priv) {
722 ret = -ENOMEM;
723 printk(KERN_ERR PFX "No memory for local response MAD\n");
724 kfree(local);
725 goto out;
726 }
727
728 build_smp_wc(mad_agent_priv->agent.qp,
729 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
730 send_wr->wr.ud.pkey_index,
731 send_wr->wr.ud.port_num, &mad_wc);
732
733 /* No GRH for DR SMP */
734 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
735 (struct ib_mad *)smp,
736 (struct ib_mad *)&mad_priv->mad);
737 switch (ret)
738 {
739 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
740 if (ib_response_mad(&mad_priv->mad.mad) &&
741 mad_agent_priv->agent.recv_handler) {
742 local->mad_priv = mad_priv;
743 local->recv_mad_agent = mad_agent_priv;
744 /*
745 * Reference MAD agent until receive
746 * side of local completion handled
747 */
748 atomic_inc(&mad_agent_priv->refcount);
749 } else
750 kmem_cache_free(ib_mad_cache, mad_priv);
751 break;
752 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
753 kmem_cache_free(ib_mad_cache, mad_priv);
754 break;
755 case IB_MAD_RESULT_SUCCESS:
756 /* Treat like an incoming receive MAD */
757 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
758 mad_agent_priv->agent.port_num);
759 if (port_priv) {
760 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
761 recv_mad_agent = find_mad_agent(port_priv,
762 &mad_priv->mad.mad);
763 }
764 if (!port_priv || !recv_mad_agent) {
765 /*
766 * No receiving agent so drop packet and
767 * generate send completion.
768 */
769 kmem_cache_free(ib_mad_cache, mad_priv);
770 break;
771 }
772 local->mad_priv = mad_priv;
773 local->recv_mad_agent = recv_mad_agent;
774 break;
775 default:
776 kmem_cache_free(ib_mad_cache, mad_priv);
777 kfree(local);
778 ret = -EINVAL;
779 goto out;
780 }
781
782 local->mad_send_wr = mad_send_wr;
783 /* Reference MAD agent until send side of local completion handled */
784 atomic_inc(&mad_agent_priv->refcount);
785 /* Queue local completion to local list */
786 spin_lock_irqsave(&mad_agent_priv->lock, flags);
787 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
788 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
789 queue_work(mad_agent_priv->qp_info->port_priv->wq,
790 &mad_agent_priv->local_work);
791 ret = 1;
792 out:
793 return ret;
794 }
795
796 static int get_pad_size(int hdr_len, int data_len)
797 {
798 int seg_size, pad;
799
800 seg_size = sizeof(struct ib_mad) - hdr_len;
801 if (data_len && seg_size) {
802 pad = seg_size - data_len % seg_size;
803 return pad == seg_size ? 0 : pad;
804 } else
805 return seg_size;
806 }
807
808 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
809 {
810 struct ib_rmpp_segment *s, *t;
811
812 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
813 list_del(&s->list);
814 kfree(s);
815 }
816 }
817
818 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
819 gfp_t gfp_mask)
820 {
821 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
822 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
823 struct ib_rmpp_segment *seg = NULL;
824 int left, seg_size, pad;
825
826 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
827 seg_size = send_buf->seg_size;
828 pad = send_wr->pad;
829
830 /* Allocate data segments. */
831 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
832 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
833 if (!seg) {
834 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
835 "alloc failed for len %zd, gfp %#x\n",
836 sizeof (*seg) + seg_size, gfp_mask);
837 free_send_rmpp_list(send_wr);
838 return -ENOMEM;
839 }
840 seg->num = ++send_buf->seg_count;
841 list_add_tail(&seg->list, &send_wr->rmpp_list);
842 }
843
844 /* Zero any padding */
845 if (pad)
846 memset(seg->data + seg_size - pad, 0, pad);
847
848 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
849 agent.rmpp_version;
850 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
851 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
852
853 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
854 struct ib_rmpp_segment, list);
855 send_wr->last_ack_seg = send_wr->cur_seg;
856 return 0;
857 }
858
859 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
860 u32 remote_qpn, u16 pkey_index,
861 int rmpp_active,
862 int hdr_len, int data_len,
863 gfp_t gfp_mask)
864 {
865 struct ib_mad_agent_private *mad_agent_priv;
866 struct ib_mad_send_wr_private *mad_send_wr;
867 int pad, message_size, ret, size;
868 void *buf;
869
870 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
871 agent);
872 pad = get_pad_size(hdr_len, data_len);
873 message_size = hdr_len + data_len + pad;
874
875 if ((!mad_agent->rmpp_version &&
876 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
877 (!rmpp_active && message_size > sizeof(struct ib_mad)))
878 return ERR_PTR(-EINVAL);
879
880 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
881 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
882 if (!buf)
883 return ERR_PTR(-ENOMEM);
884
885 mad_send_wr = buf + size;
886 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
887 mad_send_wr->send_buf.mad = buf;
888 mad_send_wr->send_buf.hdr_len = hdr_len;
889 mad_send_wr->send_buf.data_len = data_len;
890 mad_send_wr->pad = pad;
891
892 mad_send_wr->mad_agent_priv = mad_agent_priv;
893 mad_send_wr->sg_list[0].length = hdr_len;
894 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
895 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
896 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
897
898 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
899 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
900 mad_send_wr->send_wr.num_sge = 2;
901 mad_send_wr->send_wr.opcode = IB_WR_SEND;
902 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
903 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
904 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
905 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
906
907 if (rmpp_active) {
908 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
909 if (ret) {
910 kfree(buf);
911 return ERR_PTR(ret);
912 }
913 }
914
915 mad_send_wr->send_buf.mad_agent = mad_agent;
916 atomic_inc(&mad_agent_priv->refcount);
917 return &mad_send_wr->send_buf;
918 }
919 EXPORT_SYMBOL(ib_create_send_mad);
920
921 int ib_get_mad_data_offset(u8 mgmt_class)
922 {
923 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
924 return IB_MGMT_SA_HDR;
925 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
926 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
927 (mgmt_class == IB_MGMT_CLASS_BIS))
928 return IB_MGMT_DEVICE_HDR;
929 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
930 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
931 return IB_MGMT_VENDOR_HDR;
932 else
933 return IB_MGMT_MAD_HDR;
934 }
935 EXPORT_SYMBOL(ib_get_mad_data_offset);
936
937 int ib_is_mad_class_rmpp(u8 mgmt_class)
938 {
939 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
940 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
941 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
942 (mgmt_class == IB_MGMT_CLASS_BIS) ||
943 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
944 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
945 return 1;
946 return 0;
947 }
948 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
949
950 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
951 {
952 struct ib_mad_send_wr_private *mad_send_wr;
953 struct list_head *list;
954
955 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
956 send_buf);
957 list = &mad_send_wr->cur_seg->list;
958
959 if (mad_send_wr->cur_seg->num < seg_num) {
960 list_for_each_entry(mad_send_wr->cur_seg, list, list)
961 if (mad_send_wr->cur_seg->num == seg_num)
962 break;
963 } else if (mad_send_wr->cur_seg->num > seg_num) {
964 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
965 if (mad_send_wr->cur_seg->num == seg_num)
966 break;
967 }
968 return mad_send_wr->cur_seg->data;
969 }
970 EXPORT_SYMBOL(ib_get_rmpp_segment);
971
972 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
973 {
974 if (mad_send_wr->send_buf.seg_count)
975 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
976 mad_send_wr->seg_num);
977 else
978 return mad_send_wr->send_buf.mad +
979 mad_send_wr->send_buf.hdr_len;
980 }
981
982 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
983 {
984 struct ib_mad_agent_private *mad_agent_priv;
985 struct ib_mad_send_wr_private *mad_send_wr;
986
987 mad_agent_priv = container_of(send_buf->mad_agent,
988 struct ib_mad_agent_private, agent);
989 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
990 send_buf);
991
992 free_send_rmpp_list(mad_send_wr);
993 kfree(send_buf->mad);
994 deref_mad_agent(mad_agent_priv);
995 }
996 EXPORT_SYMBOL(ib_free_send_mad);
997
998 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
999 {
1000 struct ib_mad_qp_info *qp_info;
1001 struct list_head *list;
1002 struct ib_send_wr *bad_send_wr;
1003 struct ib_mad_agent *mad_agent;
1004 struct ib_sge *sge;
1005 unsigned long flags;
1006 int ret;
1007
1008 /* Set WR ID to find mad_send_wr upon completion */
1009 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1010 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1011 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1012
1013 mad_agent = mad_send_wr->send_buf.mad_agent;
1014 sge = mad_send_wr->sg_list;
1015 sge[0].addr = ib_dma_map_single(mad_agent->device,
1016 mad_send_wr->send_buf.mad,
1017 sge[0].length,
1018 DMA_TO_DEVICE);
1019 mad_send_wr->header_mapping = sge[0].addr;
1020
1021 sge[1].addr = ib_dma_map_single(mad_agent->device,
1022 ib_get_payload(mad_send_wr),
1023 sge[1].length,
1024 DMA_TO_DEVICE);
1025 mad_send_wr->payload_mapping = sge[1].addr;
1026
1027 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1028 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1029 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1030 &bad_send_wr);
1031 list = &qp_info->send_queue.list;
1032 } else {
1033 ret = 0;
1034 list = &qp_info->overflow_list;
1035 }
1036
1037 if (!ret) {
1038 qp_info->send_queue.count++;
1039 list_add_tail(&mad_send_wr->mad_list.list, list);
1040 }
1041 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1042 if (ret) {
1043 ib_dma_unmap_single(mad_agent->device,
1044 mad_send_wr->header_mapping,
1045 sge[0].length, DMA_TO_DEVICE);
1046 ib_dma_unmap_single(mad_agent->device,
1047 mad_send_wr->payload_mapping,
1048 sge[1].length, DMA_TO_DEVICE);
1049 }
1050 return ret;
1051 }
1052
1053 /*
1054 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1055 * with the registered client
1056 */
1057 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1058 struct ib_mad_send_buf **bad_send_buf)
1059 {
1060 struct ib_mad_agent_private *mad_agent_priv;
1061 struct ib_mad_send_buf *next_send_buf;
1062 struct ib_mad_send_wr_private *mad_send_wr;
1063 unsigned long flags;
1064 int ret = -EINVAL;
1065
1066 /* Walk list of send WRs and post each on send list */
1067 for (; send_buf; send_buf = next_send_buf) {
1068
1069 mad_send_wr = container_of(send_buf,
1070 struct ib_mad_send_wr_private,
1071 send_buf);
1072 mad_agent_priv = mad_send_wr->mad_agent_priv;
1073
1074 if (!send_buf->mad_agent->send_handler ||
1075 (send_buf->timeout_ms &&
1076 !send_buf->mad_agent->recv_handler)) {
1077 ret = -EINVAL;
1078 goto error;
1079 }
1080
1081 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1082 if (mad_agent_priv->agent.rmpp_version) {
1083 ret = -EINVAL;
1084 goto error;
1085 }
1086 }
1087
1088 /*
1089 * Save pointer to next work request to post in case the
1090 * current one completes, and the user modifies the work
1091 * request associated with the completion
1092 */
1093 next_send_buf = send_buf->next;
1094 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1095
1096 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1097 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1098 ret = handle_outgoing_dr_smp(mad_agent_priv,
1099 mad_send_wr);
1100 if (ret < 0) /* error */
1101 goto error;
1102 else if (ret == 1) /* locally consumed */
1103 continue;
1104 }
1105
1106 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1107 /* Timeout will be updated after send completes */
1108 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1109 mad_send_wr->max_retries = send_buf->retries;
1110 mad_send_wr->retries_left = send_buf->retries;
1111 send_buf->retries = 0;
1112 /* Reference for work request to QP + response */
1113 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1114 mad_send_wr->status = IB_WC_SUCCESS;
1115
1116 /* Reference MAD agent until send completes */
1117 atomic_inc(&mad_agent_priv->refcount);
1118 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1119 list_add_tail(&mad_send_wr->agent_list,
1120 &mad_agent_priv->send_list);
1121 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1122
1123 if (mad_agent_priv->agent.rmpp_version) {
1124 ret = ib_send_rmpp_mad(mad_send_wr);
1125 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1126 ret = ib_send_mad(mad_send_wr);
1127 } else
1128 ret = ib_send_mad(mad_send_wr);
1129 if (ret < 0) {
1130 /* Fail send request */
1131 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1132 list_del(&mad_send_wr->agent_list);
1133 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1134 atomic_dec(&mad_agent_priv->refcount);
1135 goto error;
1136 }
1137 }
1138 return 0;
1139 error:
1140 if (bad_send_buf)
1141 *bad_send_buf = send_buf;
1142 return ret;
1143 }
1144 EXPORT_SYMBOL(ib_post_send_mad);
1145
1146 /*
1147 * ib_free_recv_mad - Returns data buffers used to receive
1148 * a MAD to the access layer
1149 */
1150 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1151 {
1152 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1153 struct ib_mad_private_header *mad_priv_hdr;
1154 struct ib_mad_private *priv;
1155 struct list_head free_list;
1156
1157 INIT_LIST_HEAD(&free_list);
1158 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1159
1160 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1161 &free_list, list) {
1162 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1163 recv_buf);
1164 mad_priv_hdr = container_of(mad_recv_wc,
1165 struct ib_mad_private_header,
1166 recv_wc);
1167 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1168 header);
1169 kmem_cache_free(ib_mad_cache, priv);
1170 }
1171 }
1172 EXPORT_SYMBOL(ib_free_recv_mad);
1173
1174 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1175 u8 rmpp_version,
1176 ib_mad_send_handler send_handler,
1177 ib_mad_recv_handler recv_handler,
1178 void *context)
1179 {
1180 return ERR_PTR(-EINVAL); /* XXX: for now */
1181 }
1182 EXPORT_SYMBOL(ib_redirect_mad_qp);
1183
1184 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1185 struct ib_wc *wc)
1186 {
1187 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1188 return 0;
1189 }
1190 EXPORT_SYMBOL(ib_process_mad_wc);
1191
1192 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1193 struct ib_mad_reg_req *mad_reg_req)
1194 {
1195 int i;
1196
1197 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1198 if ((*method)->agent[i]) {
1199 printk(KERN_ERR PFX "Method %d already in use\n", i);
1200 return -EINVAL;
1201 }
1202 }
1203 return 0;
1204 }
1205
1206 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1207 {
1208 /* Allocate management method table */
1209 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1210 if (!*method) {
1211 printk(KERN_ERR PFX "No memory for "
1212 "ib_mad_mgmt_method_table\n");
1213 return -ENOMEM;
1214 }
1215
1216 return 0;
1217 }
1218
1219 /*
1220 * Check to see if there are any methods still in use
1221 */
1222 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1223 {
1224 int i;
1225
1226 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1227 if (method->agent[i])
1228 return 1;
1229 return 0;
1230 }
1231
1232 /*
1233 * Check to see if there are any method tables for this class still in use
1234 */
1235 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1236 {
1237 int i;
1238
1239 for (i = 0; i < MAX_MGMT_CLASS; i++)
1240 if (class->method_table[i])
1241 return 1;
1242 return 0;
1243 }
1244
1245 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1246 {
1247 int i;
1248
1249 for (i = 0; i < MAX_MGMT_OUI; i++)
1250 if (vendor_class->method_table[i])
1251 return 1;
1252 return 0;
1253 }
1254
1255 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1256 char *oui)
1257 {
1258 int i;
1259
1260 for (i = 0; i < MAX_MGMT_OUI; i++)
1261 /* Is there matching OUI for this vendor class ? */
1262 if (!memcmp(vendor_class->oui[i], oui, 3))
1263 return i;
1264
1265 return -1;
1266 }
1267
1268 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1269 {
1270 int i;
1271
1272 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1273 if (vendor->vendor_class[i])
1274 return 1;
1275
1276 return 0;
1277 }
1278
1279 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1280 struct ib_mad_agent_private *agent)
1281 {
1282 int i;
1283
1284 /* Remove any methods for this mad agent */
1285 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1286 if (method->agent[i] == agent) {
1287 method->agent[i] = NULL;
1288 }
1289 }
1290 }
1291
1292 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1293 struct ib_mad_agent_private *agent_priv,
1294 u8 mgmt_class)
1295 {
1296 struct ib_mad_port_private *port_priv;
1297 struct ib_mad_mgmt_class_table **class;
1298 struct ib_mad_mgmt_method_table **method;
1299 int i, ret;
1300
1301 port_priv = agent_priv->qp_info->port_priv;
1302 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1303 if (!*class) {
1304 /* Allocate management class table for "new" class version */
1305 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1306 if (!*class) {
1307 printk(KERN_ERR PFX "No memory for "
1308 "ib_mad_mgmt_class_table\n");
1309 ret = -ENOMEM;
1310 goto error1;
1311 }
1312
1313 /* Allocate method table for this management class */
1314 method = &(*class)->method_table[mgmt_class];
1315 if ((ret = allocate_method_table(method)))
1316 goto error2;
1317 } else {
1318 method = &(*class)->method_table[mgmt_class];
1319 if (!*method) {
1320 /* Allocate method table for this management class */
1321 if ((ret = allocate_method_table(method)))
1322 goto error1;
1323 }
1324 }
1325
1326 /* Now, make sure methods are not already in use */
1327 if (method_in_use(method, mad_reg_req))
1328 goto error3;
1329
1330 /* Finally, add in methods being registered */
1331 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1332 (*method)->agent[i] = agent_priv;
1333
1334 return 0;
1335
1336 error3:
1337 /* Remove any methods for this mad agent */
1338 remove_methods_mad_agent(*method, agent_priv);
1339 /* Now, check to see if there are any methods in use */
1340 if (!check_method_table(*method)) {
1341 /* If not, release management method table */
1342 kfree(*method);
1343 *method = NULL;
1344 }
1345 ret = -EINVAL;
1346 goto error1;
1347 error2:
1348 kfree(*class);
1349 *class = NULL;
1350 error1:
1351 return ret;
1352 }
1353
1354 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1355 struct ib_mad_agent_private *agent_priv)
1356 {
1357 struct ib_mad_port_private *port_priv;
1358 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1359 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1360 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1361 struct ib_mad_mgmt_method_table **method;
1362 int i, ret = -ENOMEM;
1363 u8 vclass;
1364
1365 /* "New" vendor (with OUI) class */
1366 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1367 port_priv = agent_priv->qp_info->port_priv;
1368 vendor_table = &port_priv->version[
1369 mad_reg_req->mgmt_class_version].vendor;
1370 if (!*vendor_table) {
1371 /* Allocate mgmt vendor class table for "new" class version */
1372 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1373 if (!vendor) {
1374 printk(KERN_ERR PFX "No memory for "
1375 "ib_mad_mgmt_vendor_class_table\n");
1376 goto error1;
1377 }
1378
1379 *vendor_table = vendor;
1380 }
1381 if (!(*vendor_table)->vendor_class[vclass]) {
1382 /* Allocate table for this management vendor class */
1383 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1384 if (!vendor_class) {
1385 printk(KERN_ERR PFX "No memory for "
1386 "ib_mad_mgmt_vendor_class\n");
1387 goto error2;
1388 }
1389
1390 (*vendor_table)->vendor_class[vclass] = vendor_class;
1391 }
1392 for (i = 0; i < MAX_MGMT_OUI; i++) {
1393 /* Is there matching OUI for this vendor class ? */
1394 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1395 mad_reg_req->oui, 3)) {
1396 method = &(*vendor_table)->vendor_class[
1397 vclass]->method_table[i];
1398 BUG_ON(!*method);
1399 goto check_in_use;
1400 }
1401 }
1402 for (i = 0; i < MAX_MGMT_OUI; i++) {
1403 /* OUI slot available ? */
1404 if (!is_vendor_oui((*vendor_table)->vendor_class[
1405 vclass]->oui[i])) {
1406 method = &(*vendor_table)->vendor_class[
1407 vclass]->method_table[i];
1408 BUG_ON(*method);
1409 /* Allocate method table for this OUI */
1410 if ((ret = allocate_method_table(method)))
1411 goto error3;
1412 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1413 mad_reg_req->oui, 3);
1414 goto check_in_use;
1415 }
1416 }
1417 printk(KERN_ERR PFX "All OUI slots in use\n");
1418 goto error3;
1419
1420 check_in_use:
1421 /* Now, make sure methods are not already in use */
1422 if (method_in_use(method, mad_reg_req))
1423 goto error4;
1424
1425 /* Finally, add in methods being registered */
1426 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1427 (*method)->agent[i] = agent_priv;
1428
1429 return 0;
1430
1431 error4:
1432 /* Remove any methods for this mad agent */
1433 remove_methods_mad_agent(*method, agent_priv);
1434 /* Now, check to see if there are any methods in use */
1435 if (!check_method_table(*method)) {
1436 /* If not, release management method table */
1437 kfree(*method);
1438 *method = NULL;
1439 }
1440 ret = -EINVAL;
1441 error3:
1442 if (vendor_class) {
1443 (*vendor_table)->vendor_class[vclass] = NULL;
1444 kfree(vendor_class);
1445 }
1446 error2:
1447 if (vendor) {
1448 *vendor_table = NULL;
1449 kfree(vendor);
1450 }
1451 error1:
1452 return ret;
1453 }
1454
1455 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1456 {
1457 struct ib_mad_port_private *port_priv;
1458 struct ib_mad_mgmt_class_table *class;
1459 struct ib_mad_mgmt_method_table *method;
1460 struct ib_mad_mgmt_vendor_class_table *vendor;
1461 struct ib_mad_mgmt_vendor_class *vendor_class;
1462 int index;
1463 u8 mgmt_class;
1464
1465 /*
1466 * Was MAD registration request supplied
1467 * with original registration ?
1468 */
1469 if (!agent_priv->reg_req) {
1470 goto out;
1471 }
1472
1473 port_priv = agent_priv->qp_info->port_priv;
1474 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1475 class = port_priv->version[
1476 agent_priv->reg_req->mgmt_class_version].class;
1477 if (!class)
1478 goto vendor_check;
1479
1480 method = class->method_table[mgmt_class];
1481 if (method) {
1482 /* Remove any methods for this mad agent */
1483 remove_methods_mad_agent(method, agent_priv);
1484 /* Now, check to see if there are any methods still in use */
1485 if (!check_method_table(method)) {
1486 /* If not, release management method table */
1487 kfree(method);
1488 class->method_table[mgmt_class] = NULL;
1489 /* Any management classes left ? */
1490 if (!check_class_table(class)) {
1491 /* If not, release management class table */
1492 kfree(class);
1493 port_priv->version[
1494 agent_priv->reg_req->
1495 mgmt_class_version].class = NULL;
1496 }
1497 }
1498 }
1499
1500 vendor_check:
1501 if (!is_vendor_class(mgmt_class))
1502 goto out;
1503
1504 /* normalize mgmt_class to vendor range 2 */
1505 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1506 vendor = port_priv->version[
1507 agent_priv->reg_req->mgmt_class_version].vendor;
1508
1509 if (!vendor)
1510 goto out;
1511
1512 vendor_class = vendor->vendor_class[mgmt_class];
1513 if (vendor_class) {
1514 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1515 if (index < 0)
1516 goto out;
1517 method = vendor_class->method_table[index];
1518 if (method) {
1519 /* Remove any methods for this mad agent */
1520 remove_methods_mad_agent(method, agent_priv);
1521 /*
1522 * Now, check to see if there are
1523 * any methods still in use
1524 */
1525 if (!check_method_table(method)) {
1526 /* If not, release management method table */
1527 kfree(method);
1528 vendor_class->method_table[index] = NULL;
1529 memset(vendor_class->oui[index], 0, 3);
1530 /* Any OUIs left ? */
1531 if (!check_vendor_class(vendor_class)) {
1532 /* If not, release vendor class table */
1533 kfree(vendor_class);
1534 vendor->vendor_class[mgmt_class] = NULL;
1535 /* Any other vendor classes left ? */
1536 if (!check_vendor_table(vendor)) {
1537 kfree(vendor);
1538 port_priv->version[
1539 agent_priv->reg_req->
1540 mgmt_class_version].
1541 vendor = NULL;
1542 }
1543 }
1544 }
1545 }
1546 }
1547
1548 out:
1549 return;
1550 }
1551
1552 static struct ib_mad_agent_private *
1553 find_mad_agent(struct ib_mad_port_private *port_priv,
1554 struct ib_mad *mad)
1555 {
1556 struct ib_mad_agent_private *mad_agent = NULL;
1557 unsigned long flags;
1558
1559 spin_lock_irqsave(&port_priv->reg_lock, flags);
1560 if (ib_response_mad(mad)) {
1561 u32 hi_tid;
1562 struct ib_mad_agent_private *entry;
1563
1564 /*
1565 * Routing is based on high 32 bits of transaction ID
1566 * of MAD.
1567 */
1568 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1569 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1570 if (entry->agent.hi_tid == hi_tid) {
1571 mad_agent = entry;
1572 break;
1573 }
1574 }
1575 } else {
1576 struct ib_mad_mgmt_class_table *class;
1577 struct ib_mad_mgmt_method_table *method;
1578 struct ib_mad_mgmt_vendor_class_table *vendor;
1579 struct ib_mad_mgmt_vendor_class *vendor_class;
1580 struct ib_vendor_mad *vendor_mad;
1581 int index;
1582
1583 /*
1584 * Routing is based on version, class, and method
1585 * For "newer" vendor MADs, also based on OUI
1586 */
1587 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1588 goto out;
1589 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1590 class = port_priv->version[
1591 mad->mad_hdr.class_version].class;
1592 if (!class)
1593 goto out;
1594 method = class->method_table[convert_mgmt_class(
1595 mad->mad_hdr.mgmt_class)];
1596 if (method)
1597 mad_agent = method->agent[mad->mad_hdr.method &
1598 ~IB_MGMT_METHOD_RESP];
1599 } else {
1600 vendor = port_priv->version[
1601 mad->mad_hdr.class_version].vendor;
1602 if (!vendor)
1603 goto out;
1604 vendor_class = vendor->vendor_class[vendor_class_index(
1605 mad->mad_hdr.mgmt_class)];
1606 if (!vendor_class)
1607 goto out;
1608 /* Find matching OUI */
1609 vendor_mad = (struct ib_vendor_mad *)mad;
1610 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1611 if (index == -1)
1612 goto out;
1613 method = vendor_class->method_table[index];
1614 if (method) {
1615 mad_agent = method->agent[mad->mad_hdr.method &
1616 ~IB_MGMT_METHOD_RESP];
1617 }
1618 }
1619 }
1620
1621 if (mad_agent) {
1622 if (mad_agent->agent.recv_handler)
1623 atomic_inc(&mad_agent->refcount);
1624 else {
1625 printk(KERN_NOTICE PFX "No receive handler for client "
1626 "%p on port %d\n",
1627 &mad_agent->agent, port_priv->port_num);
1628 mad_agent = NULL;
1629 }
1630 }
1631 out:
1632 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1633
1634 return mad_agent;
1635 }
1636
1637 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1638 {
1639 int valid = 0;
1640
1641 /* Make sure MAD base version is understood */
1642 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1643 printk(KERN_ERR PFX "MAD received with unsupported base "
1644 "version %d\n", mad->mad_hdr.base_version);
1645 goto out;
1646 }
1647
1648 /* Filter SMI packets sent to other than QP0 */
1649 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1650 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1651 if (qp_num == 0)
1652 valid = 1;
1653 } else {
1654 /* Filter GSI packets sent to QP0 */
1655 if (qp_num != 0)
1656 valid = 1;
1657 }
1658
1659 out:
1660 return valid;
1661 }
1662
1663 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1664 struct ib_mad_hdr *mad_hdr)
1665 {
1666 struct ib_rmpp_mad *rmpp_mad;
1667
1668 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1669 return !mad_agent_priv->agent.rmpp_version ||
1670 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1671 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1672 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1673 }
1674
1675 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1676 struct ib_mad_recv_wc *rwc)
1677 {
1678 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1679 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1680 }
1681
1682 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1683 struct ib_mad_send_wr_private *wr,
1684 struct ib_mad_recv_wc *rwc )
1685 {
1686 struct ib_ah_attr attr;
1687 u8 send_resp, rcv_resp;
1688 union ib_gid sgid;
1689 struct ib_device *device = mad_agent_priv->agent.device;
1690 u8 port_num = mad_agent_priv->agent.port_num;
1691 u8 lmc;
1692
1693 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1694 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1695
1696 if (send_resp == rcv_resp)
1697 /* both requests, or both responses. GIDs different */
1698 return 0;
1699
1700 if (ib_query_ah(wr->send_buf.ah, &attr))
1701 /* Assume not equal, to avoid false positives. */
1702 return 0;
1703
1704 if (!!(attr.ah_flags & IB_AH_GRH) !=
1705 !!(rwc->wc->wc_flags & IB_WC_GRH))
1706 /* one has GID, other does not. Assume different */
1707 return 0;
1708
1709 if (!send_resp && rcv_resp) {
1710 /* is request/response. */
1711 if (!(attr.ah_flags & IB_AH_GRH)) {
1712 if (ib_get_cached_lmc(device, port_num, &lmc))
1713 return 0;
1714 return (!lmc || !((attr.src_path_bits ^
1715 rwc->wc->dlid_path_bits) &
1716 ((1 << lmc) - 1)));
1717 } else {
1718 if (ib_get_cached_gid(device, port_num,
1719 attr.grh.sgid_index, &sgid))
1720 return 0;
1721 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1722 16);
1723 }
1724 }
1725
1726 if (!(attr.ah_flags & IB_AH_GRH))
1727 return attr.dlid == rwc->wc->slid;
1728 else
1729 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1730 16);
1731 }
1732
1733 static inline int is_direct(u8 class)
1734 {
1735 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1736 }
1737
1738 struct ib_mad_send_wr_private*
1739 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1740 struct ib_mad_recv_wc *wc)
1741 {
1742 struct ib_mad_send_wr_private *wr;
1743 struct ib_mad *mad;
1744
1745 mad = (struct ib_mad *)wc->recv_buf.mad;
1746
1747 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1748 if ((wr->tid == mad->mad_hdr.tid) &&
1749 rcv_has_same_class(wr, wc) &&
1750 /*
1751 * Don't check GID for direct routed MADs.
1752 * These might have permissive LIDs.
1753 */
1754 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1755 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1756 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1757 }
1758
1759 /*
1760 * It's possible to receive the response before we've
1761 * been notified that the send has completed
1762 */
1763 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1764 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1765 wr->tid == mad->mad_hdr.tid &&
1766 wr->timeout &&
1767 rcv_has_same_class(wr, wc) &&
1768 /*
1769 * Don't check GID for direct routed MADs.
1770 * These might have permissive LIDs.
1771 */
1772 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1773 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1774 /* Verify request has not been canceled */
1775 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1776 }
1777 return NULL;
1778 }
1779
1780 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1781 {
1782 mad_send_wr->timeout = 0;
1783 if (mad_send_wr->refcount == 1)
1784 list_move_tail(&mad_send_wr->agent_list,
1785 &mad_send_wr->mad_agent_priv->done_list);
1786 }
1787
1788 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1789 struct ib_mad_recv_wc *mad_recv_wc)
1790 {
1791 struct ib_mad_send_wr_private *mad_send_wr;
1792 struct ib_mad_send_wc mad_send_wc;
1793 unsigned long flags;
1794
1795 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1796 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1797 if (mad_agent_priv->agent.rmpp_version) {
1798 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1799 mad_recv_wc);
1800 if (!mad_recv_wc) {
1801 deref_mad_agent(mad_agent_priv);
1802 return;
1803 }
1804 }
1805
1806 /* Complete corresponding request */
1807 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1808 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1809 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1810 if (!mad_send_wr) {
1811 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1812 ib_free_recv_mad(mad_recv_wc);
1813 deref_mad_agent(mad_agent_priv);
1814 return;
1815 }
1816 ib_mark_mad_done(mad_send_wr);
1817 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1818
1819 /* Defined behavior is to complete response before request */
1820 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1821 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1822 mad_recv_wc);
1823 atomic_dec(&mad_agent_priv->refcount);
1824
1825 mad_send_wc.status = IB_WC_SUCCESS;
1826 mad_send_wc.vendor_err = 0;
1827 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1828 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1829 } else {
1830 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1831 mad_recv_wc);
1832 deref_mad_agent(mad_agent_priv);
1833 }
1834 }
1835
1836 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1837 struct ib_wc *wc)
1838 {
1839 struct ib_mad_qp_info *qp_info;
1840 struct ib_mad_private_header *mad_priv_hdr;
1841 struct ib_mad_private *recv, *response = NULL;
1842 struct ib_mad_list_head *mad_list;
1843 struct ib_mad_agent_private *mad_agent;
1844 int port_num;
1845
1846 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1847 qp_info = mad_list->mad_queue->qp_info;
1848 dequeue_mad(mad_list);
1849
1850 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1851 mad_list);
1852 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1853 ib_dma_unmap_single(port_priv->device,
1854 recv->header.mapping,
1855 sizeof(struct ib_mad_private) -
1856 sizeof(struct ib_mad_private_header),
1857 DMA_FROM_DEVICE);
1858
1859 /* Setup MAD receive work completion from "normal" work completion */
1860 recv->header.wc = *wc;
1861 recv->header.recv_wc.wc = &recv->header.wc;
1862 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1863 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1864 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1865
1866 if (atomic_read(&qp_info->snoop_count))
1867 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1868
1869 /* Validate MAD */
1870 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1871 goto out;
1872
1873 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1874 if (!response) {
1875 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1876 "for response buffer\n");
1877 goto out;
1878 }
1879
1880 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1881 port_num = wc->port_num;
1882 else
1883 port_num = port_priv->port_num;
1884
1885 if (recv->mad.mad.mad_hdr.mgmt_class ==
1886 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1887 enum smi_forward_action retsmi;
1888
1889 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1890 port_priv->device->node_type,
1891 port_num,
1892 port_priv->device->phys_port_cnt) ==
1893 IB_SMI_DISCARD)
1894 goto out;
1895
1896 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1897 if (retsmi == IB_SMI_LOCAL)
1898 goto local;
1899
1900 if (retsmi == IB_SMI_SEND) { /* don't forward */
1901 if (smi_handle_dr_smp_send(&recv->mad.smp,
1902 port_priv->device->node_type,
1903 port_num) == IB_SMI_DISCARD)
1904 goto out;
1905
1906 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1907 goto out;
1908 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1909 /* forward case for switches */
1910 memcpy(response, recv, sizeof(*response));
1911 response->header.recv_wc.wc = &response->header.wc;
1912 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1913 response->header.recv_wc.recv_buf.grh = &response->grh;
1914
1915 agent_send_response(&response->mad.mad,
1916 &response->grh, wc,
1917 port_priv->device,
1918 smi_get_fwd_port(&recv->mad.smp),
1919 qp_info->qp->qp_num);
1920
1921 goto out;
1922 }
1923 }
1924
1925 local:
1926 /* Give driver "right of first refusal" on incoming MAD */
1927 if (port_priv->device->process_mad) {
1928 int ret;
1929
1930 ret = port_priv->device->process_mad(port_priv->device, 0,
1931 port_priv->port_num,
1932 wc, &recv->grh,
1933 &recv->mad.mad,
1934 &response->mad.mad);
1935 if (ret & IB_MAD_RESULT_SUCCESS) {
1936 if (ret & IB_MAD_RESULT_CONSUMED)
1937 goto out;
1938 if (ret & IB_MAD_RESULT_REPLY) {
1939 agent_send_response(&response->mad.mad,
1940 &recv->grh, wc,
1941 port_priv->device,
1942 port_num,
1943 qp_info->qp->qp_num);
1944 goto out;
1945 }
1946 }
1947 }
1948
1949 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1950 if (mad_agent) {
1951 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1952 /*
1953 * recv is freed up in error cases in ib_mad_complete_recv
1954 * or via recv_handler in ib_mad_complete_recv()
1955 */
1956 recv = NULL;
1957 }
1958
1959 out:
1960 /* Post another receive request for this QP */
1961 if (response) {
1962 ib_mad_post_receive_mads(qp_info, response);
1963 if (recv)
1964 kmem_cache_free(ib_mad_cache, recv);
1965 } else
1966 ib_mad_post_receive_mads(qp_info, recv);
1967 }
1968
1969 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1970 {
1971 struct ib_mad_send_wr_private *mad_send_wr;
1972 unsigned long delay;
1973
1974 if (list_empty(&mad_agent_priv->wait_list)) {
1975 __cancel_delayed_work(&mad_agent_priv->timed_work);
1976 } else {
1977 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1978 struct ib_mad_send_wr_private,
1979 agent_list);
1980
1981 if (time_after(mad_agent_priv->timeout,
1982 mad_send_wr->timeout)) {
1983 mad_agent_priv->timeout = mad_send_wr->timeout;
1984 __cancel_delayed_work(&mad_agent_priv->timed_work);
1985 delay = mad_send_wr->timeout - jiffies;
1986 if ((long)delay <= 0)
1987 delay = 1;
1988 queue_delayed_work(mad_agent_priv->qp_info->
1989 port_priv->wq,
1990 &mad_agent_priv->timed_work, delay);
1991 }
1992 }
1993 }
1994
1995 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1996 {
1997 struct ib_mad_agent_private *mad_agent_priv;
1998 struct ib_mad_send_wr_private *temp_mad_send_wr;
1999 struct list_head *list_item;
2000 unsigned long delay;
2001
2002 mad_agent_priv = mad_send_wr->mad_agent_priv;
2003 list_del(&mad_send_wr->agent_list);
2004
2005 delay = mad_send_wr->timeout;
2006 mad_send_wr->timeout += jiffies;
2007
2008 if (delay) {
2009 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2010 temp_mad_send_wr = list_entry(list_item,
2011 struct ib_mad_send_wr_private,
2012 agent_list);
2013 if (time_after(mad_send_wr->timeout,
2014 temp_mad_send_wr->timeout))
2015 break;
2016 }
2017 }
2018 else
2019 list_item = &mad_agent_priv->wait_list;
2020 list_add(&mad_send_wr->agent_list, list_item);
2021
2022 /* Reschedule a work item if we have a shorter timeout */
2023 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2024 __cancel_delayed_work(&mad_agent_priv->timed_work);
2025 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2026 &mad_agent_priv->timed_work, delay);
2027 }
2028 }
2029
2030 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2031 int timeout_ms)
2032 {
2033 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2034 wait_for_response(mad_send_wr);
2035 }
2036
2037 /*
2038 * Process a send work completion
2039 */
2040 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2041 struct ib_mad_send_wc *mad_send_wc)
2042 {
2043 struct ib_mad_agent_private *mad_agent_priv;
2044 unsigned long flags;
2045 int ret;
2046
2047 mad_agent_priv = mad_send_wr->mad_agent_priv;
2048 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2049 if (mad_agent_priv->agent.rmpp_version) {
2050 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2051 if (ret == IB_RMPP_RESULT_CONSUMED)
2052 goto done;
2053 } else
2054 ret = IB_RMPP_RESULT_UNHANDLED;
2055
2056 if (mad_send_wc->status != IB_WC_SUCCESS &&
2057 mad_send_wr->status == IB_WC_SUCCESS) {
2058 mad_send_wr->status = mad_send_wc->status;
2059 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2060 }
2061
2062 if (--mad_send_wr->refcount > 0) {
2063 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2064 mad_send_wr->status == IB_WC_SUCCESS) {
2065 wait_for_response(mad_send_wr);
2066 }
2067 goto done;
2068 }
2069
2070 /* Remove send from MAD agent and notify client of completion */
2071 list_del(&mad_send_wr->agent_list);
2072 adjust_timeout(mad_agent_priv);
2073 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2074
2075 if (mad_send_wr->status != IB_WC_SUCCESS )
2076 mad_send_wc->status = mad_send_wr->status;
2077 if (ret == IB_RMPP_RESULT_INTERNAL)
2078 ib_rmpp_send_handler(mad_send_wc);
2079 else
2080 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2081 mad_send_wc);
2082
2083 /* Release reference on agent taken when sending */
2084 deref_mad_agent(mad_agent_priv);
2085 return;
2086 done:
2087 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2088 }
2089
2090 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2091 struct ib_wc *wc)
2092 {
2093 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2094 struct ib_mad_list_head *mad_list;
2095 struct ib_mad_qp_info *qp_info;
2096 struct ib_mad_queue *send_queue;
2097 struct ib_send_wr *bad_send_wr;
2098 struct ib_mad_send_wc mad_send_wc;
2099 unsigned long flags;
2100 int ret;
2101
2102 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2103 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2104 mad_list);
2105 send_queue = mad_list->mad_queue;
2106 qp_info = send_queue->qp_info;
2107
2108 retry:
2109 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2110 mad_send_wr->header_mapping,
2111 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2112 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2113 mad_send_wr->payload_mapping,
2114 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2115 queued_send_wr = NULL;
2116 spin_lock_irqsave(&send_queue->lock, flags);
2117 list_del(&mad_list->list);
2118
2119 /* Move queued send to the send queue */
2120 if (send_queue->count-- > send_queue->max_active) {
2121 mad_list = container_of(qp_info->overflow_list.next,
2122 struct ib_mad_list_head, list);
2123 queued_send_wr = container_of(mad_list,
2124 struct ib_mad_send_wr_private,
2125 mad_list);
2126 list_move_tail(&mad_list->list, &send_queue->list);
2127 }
2128 spin_unlock_irqrestore(&send_queue->lock, flags);
2129
2130 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2131 mad_send_wc.status = wc->status;
2132 mad_send_wc.vendor_err = wc->vendor_err;
2133 if (atomic_read(&qp_info->snoop_count))
2134 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2135 IB_MAD_SNOOP_SEND_COMPLETIONS);
2136 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2137
2138 if (queued_send_wr) {
2139 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2140 &bad_send_wr);
2141 if (ret) {
2142 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2143 mad_send_wr = queued_send_wr;
2144 wc->status = IB_WC_LOC_QP_OP_ERR;
2145 goto retry;
2146 }
2147 }
2148 }
2149
2150 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2151 {
2152 struct ib_mad_send_wr_private *mad_send_wr;
2153 struct ib_mad_list_head *mad_list;
2154 unsigned long flags;
2155
2156 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2157 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2158 mad_send_wr = container_of(mad_list,
2159 struct ib_mad_send_wr_private,
2160 mad_list);
2161 mad_send_wr->retry = 1;
2162 }
2163 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2164 }
2165
2166 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2167 struct ib_wc *wc)
2168 {
2169 struct ib_mad_list_head *mad_list;
2170 struct ib_mad_qp_info *qp_info;
2171 struct ib_mad_send_wr_private *mad_send_wr;
2172 int ret;
2173
2174 /* Determine if failure was a send or receive */
2175 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2176 qp_info = mad_list->mad_queue->qp_info;
2177 if (mad_list->mad_queue == &qp_info->recv_queue)
2178 /*
2179 * Receive errors indicate that the QP has entered the error
2180 * state - error handling/shutdown code will cleanup
2181 */
2182 return;
2183
2184 /*
2185 * Send errors will transition the QP to SQE - move
2186 * QP to RTS and repost flushed work requests
2187 */
2188 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2189 mad_list);
2190 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2191 if (mad_send_wr->retry) {
2192 /* Repost send */
2193 struct ib_send_wr *bad_send_wr;
2194
2195 mad_send_wr->retry = 0;
2196 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2197 &bad_send_wr);
2198 if (ret)
2199 ib_mad_send_done_handler(port_priv, wc);
2200 } else
2201 ib_mad_send_done_handler(port_priv, wc);
2202 } else {
2203 struct ib_qp_attr *attr;
2204
2205 /* Transition QP to RTS and fail offending send */
2206 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2207 if (attr) {
2208 attr->qp_state = IB_QPS_RTS;
2209 attr->cur_qp_state = IB_QPS_SQE;
2210 ret = ib_modify_qp(qp_info->qp, attr,
2211 IB_QP_STATE | IB_QP_CUR_STATE);
2212 kfree(attr);
2213 if (ret)
2214 printk(KERN_ERR PFX "mad_error_handler - "
2215 "ib_modify_qp to RTS : %d\n", ret);
2216 else
2217 mark_sends_for_retry(qp_info);
2218 }
2219 ib_mad_send_done_handler(port_priv, wc);
2220 }
2221 }
2222
2223 /*
2224 * IB MAD completion callback
2225 */
2226 static void ib_mad_completion_handler(struct work_struct *work)
2227 {
2228 struct ib_mad_port_private *port_priv;
2229 struct ib_wc wc;
2230
2231 port_priv = container_of(work, struct ib_mad_port_private, work);
2232 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2233
2234 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2235 if (wc.status == IB_WC_SUCCESS) {
2236 switch (wc.opcode) {
2237 case IB_WC_SEND:
2238 ib_mad_send_done_handler(port_priv, &wc);
2239 break;
2240 case IB_WC_RECV:
2241 ib_mad_recv_done_handler(port_priv, &wc);
2242 break;
2243 default:
2244 BUG_ON(1);
2245 break;
2246 }
2247 } else
2248 mad_error_handler(port_priv, &wc);
2249 }
2250 }
2251
2252 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2253 {
2254 unsigned long flags;
2255 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2256 struct ib_mad_send_wc mad_send_wc;
2257 struct list_head cancel_list;
2258
2259 INIT_LIST_HEAD(&cancel_list);
2260
2261 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2262 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2263 &mad_agent_priv->send_list, agent_list) {
2264 if (mad_send_wr->status == IB_WC_SUCCESS) {
2265 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2266 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2267 }
2268 }
2269
2270 /* Empty wait list to prevent receives from finding a request */
2271 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2272 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2273
2274 /* Report all cancelled requests */
2275 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2276 mad_send_wc.vendor_err = 0;
2277
2278 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2279 &cancel_list, agent_list) {
2280 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2281 list_del(&mad_send_wr->agent_list);
2282 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2283 &mad_send_wc);
2284 atomic_dec(&mad_agent_priv->refcount);
2285 }
2286 }
2287
2288 static struct ib_mad_send_wr_private*
2289 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2290 struct ib_mad_send_buf *send_buf)
2291 {
2292 struct ib_mad_send_wr_private *mad_send_wr;
2293
2294 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2295 agent_list) {
2296 if (&mad_send_wr->send_buf == send_buf)
2297 return mad_send_wr;
2298 }
2299
2300 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2301 agent_list) {
2302 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2303 &mad_send_wr->send_buf == send_buf)
2304 return mad_send_wr;
2305 }
2306 return NULL;
2307 }
2308
2309 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2310 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2311 {
2312 struct ib_mad_agent_private *mad_agent_priv;
2313 struct ib_mad_send_wr_private *mad_send_wr;
2314 unsigned long flags;
2315 int active;
2316
2317 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2318 agent);
2319 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2320 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2321 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2322 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2323 return -EINVAL;
2324 }
2325
2326 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2327 if (!timeout_ms) {
2328 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2329 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2330 }
2331
2332 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2333 if (active)
2334 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2335 else
2336 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2337
2338 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2339 return 0;
2340 }
2341 EXPORT_SYMBOL(ib_modify_mad);
2342
2343 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2344 struct ib_mad_send_buf *send_buf)
2345 {
2346 ib_modify_mad(mad_agent, send_buf, 0);
2347 }
2348 EXPORT_SYMBOL(ib_cancel_mad);
2349
2350 static void local_completions(struct work_struct *work)
2351 {
2352 struct ib_mad_agent_private *mad_agent_priv;
2353 struct ib_mad_local_private *local;
2354 struct ib_mad_agent_private *recv_mad_agent;
2355 unsigned long flags;
2356 int free_mad;
2357 struct ib_wc wc;
2358 struct ib_mad_send_wc mad_send_wc;
2359
2360 mad_agent_priv =
2361 container_of(work, struct ib_mad_agent_private, local_work);
2362
2363 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2364 while (!list_empty(&mad_agent_priv->local_list)) {
2365 local = list_entry(mad_agent_priv->local_list.next,
2366 struct ib_mad_local_private,
2367 completion_list);
2368 list_del(&local->completion_list);
2369 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2370 free_mad = 0;
2371 if (local->mad_priv) {
2372 recv_mad_agent = local->recv_mad_agent;
2373 if (!recv_mad_agent) {
2374 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2375 free_mad = 1;
2376 goto local_send_completion;
2377 }
2378
2379 /*
2380 * Defined behavior is to complete response
2381 * before request
2382 */
2383 build_smp_wc(recv_mad_agent->agent.qp,
2384 (unsigned long) local->mad_send_wr,
2385 be16_to_cpu(IB_LID_PERMISSIVE),
2386 0, recv_mad_agent->agent.port_num, &wc);
2387
2388 local->mad_priv->header.recv_wc.wc = &wc;
2389 local->mad_priv->header.recv_wc.mad_len =
2390 sizeof(struct ib_mad);
2391 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2392 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2393 &local->mad_priv->header.recv_wc.rmpp_list);
2394 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2395 local->mad_priv->header.recv_wc.recv_buf.mad =
2396 &local->mad_priv->mad.mad;
2397 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2398 snoop_recv(recv_mad_agent->qp_info,
2399 &local->mad_priv->header.recv_wc,
2400 IB_MAD_SNOOP_RECVS);
2401 recv_mad_agent->agent.recv_handler(
2402 &recv_mad_agent->agent,
2403 &local->mad_priv->header.recv_wc);
2404 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2405 atomic_dec(&recv_mad_agent->refcount);
2406 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2407 }
2408
2409 local_send_completion:
2410 /* Complete send */
2411 mad_send_wc.status = IB_WC_SUCCESS;
2412 mad_send_wc.vendor_err = 0;
2413 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2414 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2415 snoop_send(mad_agent_priv->qp_info,
2416 &local->mad_send_wr->send_buf,
2417 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2418 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2419 &mad_send_wc);
2420
2421 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2422 atomic_dec(&mad_agent_priv->refcount);
2423 if (free_mad)
2424 kmem_cache_free(ib_mad_cache, local->mad_priv);
2425 kfree(local);
2426 }
2427 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2428 }
2429
2430 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2431 {
2432 int ret;
2433
2434 if (!mad_send_wr->retries_left)
2435 return -ETIMEDOUT;
2436
2437 mad_send_wr->retries_left--;
2438 mad_send_wr->send_buf.retries++;
2439
2440 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2441
2442 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2443 ret = ib_retry_rmpp(mad_send_wr);
2444 switch (ret) {
2445 case IB_RMPP_RESULT_UNHANDLED:
2446 ret = ib_send_mad(mad_send_wr);
2447 break;
2448 case IB_RMPP_RESULT_CONSUMED:
2449 ret = 0;
2450 break;
2451 default:
2452 ret = -ECOMM;
2453 break;
2454 }
2455 } else
2456 ret = ib_send_mad(mad_send_wr);
2457
2458 if (!ret) {
2459 mad_send_wr->refcount++;
2460 list_add_tail(&mad_send_wr->agent_list,
2461 &mad_send_wr->mad_agent_priv->send_list);
2462 }
2463 return ret;
2464 }
2465
2466 static void timeout_sends(struct work_struct *work)
2467 {
2468 struct ib_mad_agent_private *mad_agent_priv;
2469 struct ib_mad_send_wr_private *mad_send_wr;
2470 struct ib_mad_send_wc mad_send_wc;
2471 unsigned long flags, delay;
2472
2473 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2474 timed_work.work);
2475 mad_send_wc.vendor_err = 0;
2476
2477 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2478 while (!list_empty(&mad_agent_priv->wait_list)) {
2479 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2480 struct ib_mad_send_wr_private,
2481 agent_list);
2482
2483 if (time_after(mad_send_wr->timeout, jiffies)) {
2484 delay = mad_send_wr->timeout - jiffies;
2485 if ((long)delay <= 0)
2486 delay = 1;
2487 queue_delayed_work(mad_agent_priv->qp_info->
2488 port_priv->wq,
2489 &mad_agent_priv->timed_work, delay);
2490 break;
2491 }
2492
2493 list_del(&mad_send_wr->agent_list);
2494 if (mad_send_wr->status == IB_WC_SUCCESS &&
2495 !retry_send(mad_send_wr))
2496 continue;
2497
2498 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2499
2500 if (mad_send_wr->status == IB_WC_SUCCESS)
2501 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2502 else
2503 mad_send_wc.status = mad_send_wr->status;
2504 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2505 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2506 &mad_send_wc);
2507
2508 atomic_dec(&mad_agent_priv->refcount);
2509 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2510 }
2511 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2512 }
2513
2514 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2515 {
2516 struct ib_mad_port_private *port_priv = cq->cq_context;
2517 unsigned long flags;
2518
2519 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2520 if (!list_empty(&port_priv->port_list))
2521 queue_work(port_priv->wq, &port_priv->work);
2522 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2523 }
2524
2525 /*
2526 * Allocate receive MADs and post receive WRs for them
2527 */
2528 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2529 struct ib_mad_private *mad)
2530 {
2531 unsigned long flags;
2532 int post, ret;
2533 struct ib_mad_private *mad_priv;
2534 struct ib_sge sg_list;
2535 struct ib_recv_wr recv_wr, *bad_recv_wr;
2536 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2537
2538 /* Initialize common scatter list fields */
2539 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2540 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2541
2542 /* Initialize common receive WR fields */
2543 recv_wr.next = NULL;
2544 recv_wr.sg_list = &sg_list;
2545 recv_wr.num_sge = 1;
2546
2547 do {
2548 /* Allocate and map receive buffer */
2549 if (mad) {
2550 mad_priv = mad;
2551 mad = NULL;
2552 } else {
2553 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2554 if (!mad_priv) {
2555 printk(KERN_ERR PFX "No memory for receive buffer\n");
2556 ret = -ENOMEM;
2557 break;
2558 }
2559 }
2560 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2561 &mad_priv->grh,
2562 sizeof *mad_priv -
2563 sizeof mad_priv->header,
2564 DMA_FROM_DEVICE);
2565 mad_priv->header.mapping = sg_list.addr;
2566 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2567 mad_priv->header.mad_list.mad_queue = recv_queue;
2568
2569 /* Post receive WR */
2570 spin_lock_irqsave(&recv_queue->lock, flags);
2571 post = (++recv_queue->count < recv_queue->max_active);
2572 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2573 spin_unlock_irqrestore(&recv_queue->lock, flags);
2574 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2575 if (ret) {
2576 spin_lock_irqsave(&recv_queue->lock, flags);
2577 list_del(&mad_priv->header.mad_list.list);
2578 recv_queue->count--;
2579 spin_unlock_irqrestore(&recv_queue->lock, flags);
2580 ib_dma_unmap_single(qp_info->port_priv->device,
2581 mad_priv->header.mapping,
2582 sizeof *mad_priv -
2583 sizeof mad_priv->header,
2584 DMA_FROM_DEVICE);
2585 kmem_cache_free(ib_mad_cache, mad_priv);
2586 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2587 break;
2588 }
2589 } while (post);
2590
2591 return ret;
2592 }
2593
2594 /*
2595 * Return all the posted receive MADs
2596 */
2597 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2598 {
2599 struct ib_mad_private_header *mad_priv_hdr;
2600 struct ib_mad_private *recv;
2601 struct ib_mad_list_head *mad_list;
2602
2603 while (!list_empty(&qp_info->recv_queue.list)) {
2604
2605 mad_list = list_entry(qp_info->recv_queue.list.next,
2606 struct ib_mad_list_head, list);
2607 mad_priv_hdr = container_of(mad_list,
2608 struct ib_mad_private_header,
2609 mad_list);
2610 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2611 header);
2612
2613 /* Remove from posted receive MAD list */
2614 list_del(&mad_list->list);
2615
2616 ib_dma_unmap_single(qp_info->port_priv->device,
2617 recv->header.mapping,
2618 sizeof(struct ib_mad_private) -
2619 sizeof(struct ib_mad_private_header),
2620 DMA_FROM_DEVICE);
2621 kmem_cache_free(ib_mad_cache, recv);
2622 }
2623
2624 qp_info->recv_queue.count = 0;
2625 }
2626
2627 /*
2628 * Start the port
2629 */
2630 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2631 {
2632 int ret, i;
2633 struct ib_qp_attr *attr;
2634 struct ib_qp *qp;
2635
2636 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2637 if (!attr) {
2638 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2639 return -ENOMEM;
2640 }
2641
2642 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2643 qp = port_priv->qp_info[i].qp;
2644 /*
2645 * PKey index for QP1 is irrelevant but
2646 * one is needed for the Reset to Init transition
2647 */
2648 attr->qp_state = IB_QPS_INIT;
2649 attr->pkey_index = 0;
2650 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2651 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2652 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2653 if (ret) {
2654 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2655 "INIT: %d\n", i, ret);
2656 goto out;
2657 }
2658
2659 attr->qp_state = IB_QPS_RTR;
2660 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2661 if (ret) {
2662 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2663 "RTR: %d\n", i, ret);
2664 goto out;
2665 }
2666
2667 attr->qp_state = IB_QPS_RTS;
2668 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2669 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2670 if (ret) {
2671 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2672 "RTS: %d\n", i, ret);
2673 goto out;
2674 }
2675 }
2676
2677 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2678 if (ret) {
2679 printk(KERN_ERR PFX "Failed to request completion "
2680 "notification: %d\n", ret);
2681 goto out;
2682 }
2683
2684 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2685 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2686 if (ret) {
2687 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2688 goto out;
2689 }
2690 }
2691 out:
2692 kfree(attr);
2693 return ret;
2694 }
2695
2696 static void qp_event_handler(struct ib_event *event, void *qp_context)
2697 {
2698 struct ib_mad_qp_info *qp_info = qp_context;
2699
2700 /* It's worse than that! He's dead, Jim! */
2701 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2702 event->event, qp_info->qp->qp_num);
2703 }
2704
2705 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2706 struct ib_mad_queue *mad_queue)
2707 {
2708 mad_queue->qp_info = qp_info;
2709 mad_queue->count = 0;
2710 spin_lock_init(&mad_queue->lock);
2711 INIT_LIST_HEAD(&mad_queue->list);
2712 }
2713
2714 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2715 struct ib_mad_qp_info *qp_info)
2716 {
2717 qp_info->port_priv = port_priv;
2718 init_mad_queue(qp_info, &qp_info->send_queue);
2719 init_mad_queue(qp_info, &qp_info->recv_queue);
2720 INIT_LIST_HEAD(&qp_info->overflow_list);
2721 spin_lock_init(&qp_info->snoop_lock);
2722 qp_info->snoop_table = NULL;
2723 qp_info->snoop_table_size = 0;
2724 atomic_set(&qp_info->snoop_count, 0);
2725 }
2726
2727 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2728 enum ib_qp_type qp_type)
2729 {
2730 struct ib_qp_init_attr qp_init_attr;
2731 int ret;
2732
2733 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2734 qp_init_attr.send_cq = qp_info->port_priv->cq;
2735 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2736 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2737 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2738 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2739 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2740 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2741 qp_init_attr.qp_type = qp_type;
2742 qp_init_attr.port_num = qp_info->port_priv->port_num;
2743 qp_init_attr.qp_context = qp_info;
2744 qp_init_attr.event_handler = qp_event_handler;
2745 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2746 if (IS_ERR(qp_info->qp)) {
2747 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2748 get_spl_qp_index(qp_type));
2749 ret = PTR_ERR(qp_info->qp);
2750 goto error;
2751 }
2752 /* Use minimum queue sizes unless the CQ is resized */
2753 qp_info->send_queue.max_active = mad_sendq_size;
2754 qp_info->recv_queue.max_active = mad_recvq_size;
2755 return 0;
2756
2757 error:
2758 return ret;
2759 }
2760
2761 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2762 {
2763 ib_destroy_qp(qp_info->qp);
2764 kfree(qp_info->snoop_table);
2765 }
2766
2767 /*
2768 * Open the port
2769 * Create the QP, PD, MR, and CQ if needed
2770 */
2771 static int ib_mad_port_open(struct ib_device *device,
2772 int port_num)
2773 {
2774 int ret, cq_size;
2775 struct ib_mad_port_private *port_priv;
2776 unsigned long flags;
2777 char name[sizeof "ib_mad123"];
2778
2779 /* Create new device info */
2780 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2781 if (!port_priv) {
2782 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2783 return -ENOMEM;
2784 }
2785
2786 port_priv->device = device;
2787 port_priv->port_num = port_num;
2788 spin_lock_init(&port_priv->reg_lock);
2789 INIT_LIST_HEAD(&port_priv->agent_list);
2790 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2791 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2792
2793 cq_size = (mad_sendq_size + mad_recvq_size) * 2;
2794 port_priv->cq = ib_create_cq(port_priv->device,
2795 ib_mad_thread_completion_handler,
2796 NULL, port_priv, cq_size, 0);
2797 if (IS_ERR(port_priv->cq)) {
2798 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2799 ret = PTR_ERR(port_priv->cq);
2800 goto error3;
2801 }
2802
2803 port_priv->pd = ib_alloc_pd(device);
2804 if (IS_ERR(port_priv->pd)) {
2805 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2806 ret = PTR_ERR(port_priv->pd);
2807 goto error4;
2808 }
2809
2810 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2811 if (IS_ERR(port_priv->mr)) {
2812 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2813 ret = PTR_ERR(port_priv->mr);
2814 goto error5;
2815 }
2816
2817 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2818 if (ret)
2819 goto error6;
2820 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2821 if (ret)
2822 goto error7;
2823
2824 snprintf(name, sizeof name, "ib_mad%d", port_num);
2825 port_priv->wq = create_singlethread_workqueue(name);
2826 if (!port_priv->wq) {
2827 ret = -ENOMEM;
2828 goto error8;
2829 }
2830 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2831
2832 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2833 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2834 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2835
2836 ret = ib_mad_port_start(port_priv);
2837 if (ret) {
2838 printk(KERN_ERR PFX "Couldn't start port\n");
2839 goto error9;
2840 }
2841
2842 return 0;
2843
2844 error9:
2845 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2846 list_del_init(&port_priv->port_list);
2847 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2848
2849 destroy_workqueue(port_priv->wq);
2850 error8:
2851 destroy_mad_qp(&port_priv->qp_info[1]);
2852 error7:
2853 destroy_mad_qp(&port_priv->qp_info[0]);
2854 error6:
2855 ib_dereg_mr(port_priv->mr);
2856 error5:
2857 ib_dealloc_pd(port_priv->pd);
2858 error4:
2859 ib_destroy_cq(port_priv->cq);
2860 cleanup_recv_queue(&port_priv->qp_info[1]);
2861 cleanup_recv_queue(&port_priv->qp_info[0]);
2862 error3:
2863 kfree(port_priv);
2864
2865 return ret;
2866 }
2867
2868 /*
2869 * Close the port
2870 * If there are no classes using the port, free the port
2871 * resources (CQ, MR, PD, QP) and remove the port's info structure
2872 */
2873 static int ib_mad_port_close(struct ib_device *device, int port_num)
2874 {
2875 struct ib_mad_port_private *port_priv;
2876 unsigned long flags;
2877
2878 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2879 port_priv = __ib_get_mad_port(device, port_num);
2880 if (port_priv == NULL) {
2881 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2882 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2883 return -ENODEV;
2884 }
2885 list_del_init(&port_priv->port_list);
2886 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2887
2888 destroy_workqueue(port_priv->wq);
2889 destroy_mad_qp(&port_priv->qp_info[1]);
2890 destroy_mad_qp(&port_priv->qp_info[0]);
2891 ib_dereg_mr(port_priv->mr);
2892 ib_dealloc_pd(port_priv->pd);
2893 ib_destroy_cq(port_priv->cq);
2894 cleanup_recv_queue(&port_priv->qp_info[1]);
2895 cleanup_recv_queue(&port_priv->qp_info[0]);
2896 /* XXX: Handle deallocation of MAD registration tables */
2897
2898 kfree(port_priv);
2899
2900 return 0;
2901 }
2902
2903 static void ib_mad_init_device(struct ib_device *device)
2904 {
2905 int start, end, i;
2906
2907 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2908 return;
2909
2910 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2911 start = 0;
2912 end = 0;
2913 } else {
2914 start = 1;
2915 end = device->phys_port_cnt;
2916 }
2917
2918 for (i = start; i <= end; i++) {
2919 if (ib_mad_port_open(device, i)) {
2920 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2921 device->name, i);
2922 goto error;
2923 }
2924 if (ib_agent_port_open(device, i)) {
2925 printk(KERN_ERR PFX "Couldn't open %s port %d "
2926 "for agents\n",
2927 device->name, i);
2928 goto error_agent;
2929 }
2930 }
2931 return;
2932
2933 error_agent:
2934 if (ib_mad_port_close(device, i))
2935 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2936 device->name, i);
2937
2938 error:
2939 i--;
2940
2941 while (i >= start) {
2942 if (ib_agent_port_close(device, i))
2943 printk(KERN_ERR PFX "Couldn't close %s port %d "
2944 "for agents\n",
2945 device->name, i);
2946 if (ib_mad_port_close(device, i))
2947 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2948 device->name, i);
2949 i--;
2950 }
2951 }
2952
2953 static void ib_mad_remove_device(struct ib_device *device)
2954 {
2955 int i, num_ports, cur_port;
2956
2957 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2958 return;
2959
2960 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2961 num_ports = 1;
2962 cur_port = 0;
2963 } else {
2964 num_ports = device->phys_port_cnt;
2965 cur_port = 1;
2966 }
2967 for (i = 0; i < num_ports; i++, cur_port++) {
2968 if (ib_agent_port_close(device, cur_port))
2969 printk(KERN_ERR PFX "Couldn't close %s port %d "
2970 "for agents\n",
2971 device->name, cur_port);
2972 if (ib_mad_port_close(device, cur_port))
2973 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2974 device->name, cur_port);
2975 }
2976 }
2977
2978 static struct ib_client mad_client = {
2979 .name = "mad",
2980 .add = ib_mad_init_device,
2981 .remove = ib_mad_remove_device
2982 };
2983
2984 static int __init ib_mad_init_module(void)
2985 {
2986 int ret;
2987
2988 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
2989 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
2990
2991 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
2992 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
2993
2994 ib_mad_cache = kmem_cache_create("ib_mad",
2995 sizeof(struct ib_mad_private),
2996 0,
2997 SLAB_HWCACHE_ALIGN,
2998 NULL);
2999 if (!ib_mad_cache) {
3000 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3001 ret = -ENOMEM;
3002 goto error1;
3003 }
3004
3005 INIT_LIST_HEAD(&ib_mad_port_list);
3006
3007 if (ib_register_client(&mad_client)) {
3008 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3009 ret = -EINVAL;
3010 goto error2;
3011 }
3012
3013 return 0;
3014
3015 error2:
3016 kmem_cache_destroy(ib_mad_cache);
3017 error1:
3018 return ret;
3019 }
3020
3021 static void __exit ib_mad_cleanup_module(void)
3022 {
3023 ib_unregister_client(&mad_client);
3024 kmem_cache_destroy(ib_mad_cache);
3025 }
3026
3027 module_init(ib_mad_init_module);
3028 module_exit(ib_mad_cleanup_module);
Linux with added FPC-III support