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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / infiniband / core / mad.c
blobbb3dad20bb8371b5561285b5c716df0c442325e5
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 <linux/module.h>
39 #include <rdma/ib_cache.h>
40
41 #include "mad_priv.h"
42 #include "mad_rmpp.h"
43 #include "smi.h"
44 #include "agent.h"
45
46 MODULE_LICENSE("Dual BSD/GPL");
47 MODULE_DESCRIPTION("kernel IB MAD API");
48 MODULE_AUTHOR("Hal Rosenstock");
49 MODULE_AUTHOR("Sean Hefty");
50
51 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
52 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
53
54 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
55 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
56 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
57 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
58
59 static struct kmem_cache *ib_mad_cache;
60
61 static struct list_head ib_mad_port_list;
62 static u32 ib_mad_client_id = 0;
63
64 /* Port list lock */
65 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
66
67 /* Forward declarations */
68 static int method_in_use(struct ib_mad_mgmt_method_table **method,
69 struct ib_mad_reg_req *mad_reg_req);
70 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
71 static struct ib_mad_agent_private *find_mad_agent(
72 struct ib_mad_port_private *port_priv,
73 struct ib_mad *mad);
74 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
75 struct ib_mad_private *mad);
76 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
77 static void timeout_sends(struct work_struct *work);
78 static void local_completions(struct work_struct *work);
79 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
80 struct ib_mad_agent_private *agent_priv,
81 u8 mgmt_class);
82 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv);
84
85 /*
86 * Returns a ib_mad_port_private structure or NULL for a device/port
87 * Assumes ib_mad_port_list_lock is being held
88 */
89 static inline struct ib_mad_port_private *
90 __ib_get_mad_port(struct ib_device *device, int port_num)
91 {
92 struct ib_mad_port_private *entry;
93
94 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
95 if (entry->device == device && entry->port_num == port_num)
96 return entry;
97 }
98 return NULL;
99 }
100
101 /*
102 * Wrapper function to return a ib_mad_port_private structure or NULL
103 * for a device/port
104 */
105 static inline struct ib_mad_port_private *
106 ib_get_mad_port(struct ib_device *device, int port_num)
107 {
108 struct ib_mad_port_private *entry;
109 unsigned long flags;
110
111 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
112 entry = __ib_get_mad_port(device, port_num);
113 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
114
115 return entry;
116 }
117
118 static inline u8 convert_mgmt_class(u8 mgmt_class)
119 {
120 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
121 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
122 0 : mgmt_class;
123 }
124
125 static int get_spl_qp_index(enum ib_qp_type qp_type)
126 {
127 switch (qp_type)
128 {
129 case IB_QPT_SMI:
130 return 0;
131 case IB_QPT_GSI:
132 return 1;
133 default:
134 return -1;
135 }
136 }
137
138 static int vendor_class_index(u8 mgmt_class)
139 {
140 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
141 }
142
143 static int is_vendor_class(u8 mgmt_class)
144 {
145 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
146 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
147 return 0;
148 return 1;
149 }
150
151 static int is_vendor_oui(char *oui)
152 {
153 if (oui[0] || oui[1] || oui[2])
154 return 1;
155 return 0;
156 }
157
158 static int is_vendor_method_in_use(
159 struct ib_mad_mgmt_vendor_class *vendor_class,
160 struct ib_mad_reg_req *mad_reg_req)
161 {
162 struct ib_mad_mgmt_method_table *method;
163 int i;
164
165 for (i = 0; i < MAX_MGMT_OUI; i++) {
166 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
167 method = vendor_class->method_table[i];
168 if (method) {
169 if (method_in_use(&method, mad_reg_req))
170 return 1;
171 else
172 break;
173 }
174 }
175 }
176 return 0;
177 }
178
179 int ib_response_mad(struct ib_mad *mad)
180 {
181 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
182 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
183 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
184 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
185 }
186 EXPORT_SYMBOL(ib_response_mad);
187
188 /*
189 * ib_register_mad_agent - Register to send/receive MADs
190 */
191 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
192 u8 port_num,
193 enum ib_qp_type qp_type,
194 struct ib_mad_reg_req *mad_reg_req,
195 u8 rmpp_version,
196 ib_mad_send_handler send_handler,
197 ib_mad_recv_handler recv_handler,
198 void *context)
199 {
200 struct ib_mad_port_private *port_priv;
201 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
202 struct ib_mad_agent_private *mad_agent_priv;
203 struct ib_mad_reg_req *reg_req = NULL;
204 struct ib_mad_mgmt_class_table *class;
205 struct ib_mad_mgmt_vendor_class_table *vendor;
206 struct ib_mad_mgmt_vendor_class *vendor_class;
207 struct ib_mad_mgmt_method_table *method;
208 int ret2, qpn;
209 unsigned long flags;
210 u8 mgmt_class, vclass;
211
212 /* Validate parameters */
213 qpn = get_spl_qp_index(qp_type);
214 if (qpn == -1)
215 goto error1;
216
217 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
218 goto error1;
219
220 /* Validate MAD registration request if supplied */
221 if (mad_reg_req) {
222 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
223 goto error1;
224 if (!recv_handler)
225 goto error1;
226 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
227 /*
228 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
229 * one in this range currently allowed
230 */
231 if (mad_reg_req->mgmt_class !=
232 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
233 goto error1;
234 } else if (mad_reg_req->mgmt_class == 0) {
235 /*
236 * Class 0 is reserved in IBA and is used for
237 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
238 */
239 goto error1;
240 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
241 /*
242 * If class is in "new" vendor range,
243 * ensure supplied OUI is not zero
244 */
245 if (!is_vendor_oui(mad_reg_req->oui))
246 goto error1;
247 }
248 /* Make sure class supplied is consistent with RMPP */
249 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
250 if (rmpp_version)
251 goto error1;
252 }
253 /* Make sure class supplied is consistent with QP type */
254 if (qp_type == IB_QPT_SMI) {
255 if ((mad_reg_req->mgmt_class !=
256 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
257 (mad_reg_req->mgmt_class !=
258 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
259 goto error1;
260 } else {
261 if ((mad_reg_req->mgmt_class ==
262 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
263 (mad_reg_req->mgmt_class ==
264 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
265 goto error1;
266 }
267 } else {
268 /* No registration request supplied */
269 if (!send_handler)
270 goto error1;
271 }
272
273 /* Validate device and port */
274 port_priv = ib_get_mad_port(device, port_num);
275 if (!port_priv) {
276 ret = ERR_PTR(-ENODEV);
277 goto error1;
278 }
279
280 /* Verify the QP requested is supported. For example, Ethernet devices
281 * will not have QP0 */
282 if (!port_priv->qp_info[qpn].qp) {
283 ret = ERR_PTR(-EPROTONOSUPPORT);
284 goto error1;
285 }
286
287 /* Allocate structures */
288 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
289 if (!mad_agent_priv) {
290 ret = ERR_PTR(-ENOMEM);
291 goto error1;
292 }
293
294 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
295 IB_ACCESS_LOCAL_WRITE);
296 if (IS_ERR(mad_agent_priv->agent.mr)) {
297 ret = ERR_PTR(-ENOMEM);
298 goto error2;
299 }
300
301 if (mad_reg_req) {
302 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
303 if (!reg_req) {
304 ret = ERR_PTR(-ENOMEM);
305 goto error3;
306 }
307 }
308
309 /* Now, fill in the various structures */
310 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
311 mad_agent_priv->reg_req = reg_req;
312 mad_agent_priv->agent.rmpp_version = rmpp_version;
313 mad_agent_priv->agent.device = device;
314 mad_agent_priv->agent.recv_handler = recv_handler;
315 mad_agent_priv->agent.send_handler = send_handler;
316 mad_agent_priv->agent.context = context;
317 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
318 mad_agent_priv->agent.port_num = port_num;
319 spin_lock_init(&mad_agent_priv->lock);
320 INIT_LIST_HEAD(&mad_agent_priv->send_list);
321 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
322 INIT_LIST_HEAD(&mad_agent_priv->done_list);
323 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
324 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
325 INIT_LIST_HEAD(&mad_agent_priv->local_list);
326 INIT_WORK(&mad_agent_priv->local_work, local_completions);
327 atomic_set(&mad_agent_priv->refcount, 1);
328 init_completion(&mad_agent_priv->comp);
329
330 spin_lock_irqsave(&port_priv->reg_lock, flags);
331 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
332
333 /*
334 * Make sure MAD registration (if supplied)
335 * is non overlapping with any existing ones
336 */
337 if (mad_reg_req) {
338 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
339 if (!is_vendor_class(mgmt_class)) {
340 class = port_priv->version[mad_reg_req->
341 mgmt_class_version].class;
342 if (class) {
343 method = class->method_table[mgmt_class];
344 if (method) {
345 if (method_in_use(&method,
346 mad_reg_req))
347 goto error4;
348 }
349 }
350 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
351 mgmt_class);
352 } else {
353 /* "New" vendor class range */
354 vendor = port_priv->version[mad_reg_req->
355 mgmt_class_version].vendor;
356 if (vendor) {
357 vclass = vendor_class_index(mgmt_class);
358 vendor_class = vendor->vendor_class[vclass];
359 if (vendor_class) {
360 if (is_vendor_method_in_use(
361 vendor_class,
362 mad_reg_req))
363 goto error4;
364 }
365 }
366 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
367 }
368 if (ret2) {
369 ret = ERR_PTR(ret2);
370 goto error4;
371 }
372 }
373
374 /* Add mad agent into port's agent list */
375 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
376 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
377
378 return &mad_agent_priv->agent;
379
380 error4:
381 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
382 kfree(reg_req);
383 error3:
384 ib_dereg_mr(mad_agent_priv->agent.mr);
385 error2:
386 kfree(mad_agent_priv);
387 error1:
388 return ret;
389 }
390 EXPORT_SYMBOL(ib_register_mad_agent);
391
392 static inline int is_snooping_sends(int mad_snoop_flags)
393 {
394 return (mad_snoop_flags &
395 (/*IB_MAD_SNOOP_POSTED_SENDS |
396 IB_MAD_SNOOP_RMPP_SENDS |*/
397 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
398 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
399 }
400
401 static inline int is_snooping_recvs(int mad_snoop_flags)
402 {
403 return (mad_snoop_flags &
404 (IB_MAD_SNOOP_RECVS /*|
405 IB_MAD_SNOOP_RMPP_RECVS*/));
406 }
407
408 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
409 struct ib_mad_snoop_private *mad_snoop_priv)
410 {
411 struct ib_mad_snoop_private **new_snoop_table;
412 unsigned long flags;
413 int i;
414
415 spin_lock_irqsave(&qp_info->snoop_lock, flags);
416 /* Check for empty slot in array. */
417 for (i = 0; i < qp_info->snoop_table_size; i++)
418 if (!qp_info->snoop_table[i])
419 break;
420
421 if (i == qp_info->snoop_table_size) {
422 /* Grow table. */
423 new_snoop_table = krealloc(qp_info->snoop_table,
424 sizeof mad_snoop_priv *
425 (qp_info->snoop_table_size + 1),
426 GFP_ATOMIC);
427 if (!new_snoop_table) {
428 i = -ENOMEM;
429 goto out;
430 }
431
432 qp_info->snoop_table = new_snoop_table;
433 qp_info->snoop_table_size++;
434 }
435 qp_info->snoop_table[i] = mad_snoop_priv;
436 atomic_inc(&qp_info->snoop_count);
437 out:
438 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
439 return i;
440 }
441
442 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
443 u8 port_num,
444 enum ib_qp_type qp_type,
445 int mad_snoop_flags,
446 ib_mad_snoop_handler snoop_handler,
447 ib_mad_recv_handler recv_handler,
448 void *context)
449 {
450 struct ib_mad_port_private *port_priv;
451 struct ib_mad_agent *ret;
452 struct ib_mad_snoop_private *mad_snoop_priv;
453 int qpn;
454
455 /* Validate parameters */
456 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
457 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
458 ret = ERR_PTR(-EINVAL);
459 goto error1;
460 }
461 qpn = get_spl_qp_index(qp_type);
462 if (qpn == -1) {
463 ret = ERR_PTR(-EINVAL);
464 goto error1;
465 }
466 port_priv = ib_get_mad_port(device, port_num);
467 if (!port_priv) {
468 ret = ERR_PTR(-ENODEV);
469 goto error1;
470 }
471 /* Allocate structures */
472 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
473 if (!mad_snoop_priv) {
474 ret = ERR_PTR(-ENOMEM);
475 goto error1;
476 }
477
478 /* Now, fill in the various structures */
479 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
480 mad_snoop_priv->agent.device = device;
481 mad_snoop_priv->agent.recv_handler = recv_handler;
482 mad_snoop_priv->agent.snoop_handler = snoop_handler;
483 mad_snoop_priv->agent.context = context;
484 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
485 mad_snoop_priv->agent.port_num = port_num;
486 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
487 init_completion(&mad_snoop_priv->comp);
488 mad_snoop_priv->snoop_index = register_snoop_agent(
489 &port_priv->qp_info[qpn],
490 mad_snoop_priv);
491 if (mad_snoop_priv->snoop_index < 0) {
492 ret = ERR_PTR(mad_snoop_priv->snoop_index);
493 goto error2;
494 }
495
496 atomic_set(&mad_snoop_priv->refcount, 1);
497 return &mad_snoop_priv->agent;
498
499 error2:
500 kfree(mad_snoop_priv);
501 error1:
502 return ret;
503 }
504 EXPORT_SYMBOL(ib_register_mad_snoop);
505
506 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
507 {
508 if (atomic_dec_and_test(&mad_agent_priv->refcount))
509 complete(&mad_agent_priv->comp);
510 }
511
512 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
513 {
514 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
515 complete(&mad_snoop_priv->comp);
516 }
517
518 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
519 {
520 struct ib_mad_port_private *port_priv;
521 unsigned long flags;
522
523 /* Note that we could still be handling received MADs */
524
525 /*
526 * Canceling all sends results in dropping received response
527 * MADs, preventing us from queuing additional work
528 */
529 cancel_mads(mad_agent_priv);
530 port_priv = mad_agent_priv->qp_info->port_priv;
531 cancel_delayed_work(&mad_agent_priv->timed_work);
532
533 spin_lock_irqsave(&port_priv->reg_lock, flags);
534 remove_mad_reg_req(mad_agent_priv);
535 list_del(&mad_agent_priv->agent_list);
536 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
537
538 flush_workqueue(port_priv->wq);
539 ib_cancel_rmpp_recvs(mad_agent_priv);
540
541 deref_mad_agent(mad_agent_priv);
542 wait_for_completion(&mad_agent_priv->comp);
543
544 kfree(mad_agent_priv->reg_req);
545 ib_dereg_mr(mad_agent_priv->agent.mr);
546 kfree(mad_agent_priv);
547 }
548
549 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
550 {
551 struct ib_mad_qp_info *qp_info;
552 unsigned long flags;
553
554 qp_info = mad_snoop_priv->qp_info;
555 spin_lock_irqsave(&qp_info->snoop_lock, flags);
556 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
557 atomic_dec(&qp_info->snoop_count);
558 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
559
560 deref_snoop_agent(mad_snoop_priv);
561 wait_for_completion(&mad_snoop_priv->comp);
562
563 kfree(mad_snoop_priv);
564 }
565
566 /*
567 * ib_unregister_mad_agent - Unregisters a client from using MAD services
568 */
569 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
570 {
571 struct ib_mad_agent_private *mad_agent_priv;
572 struct ib_mad_snoop_private *mad_snoop_priv;
573
574 /* If the TID is zero, the agent can only snoop. */
575 if (mad_agent->hi_tid) {
576 mad_agent_priv = container_of(mad_agent,
577 struct ib_mad_agent_private,
578 agent);
579 unregister_mad_agent(mad_agent_priv);
580 } else {
581 mad_snoop_priv = container_of(mad_agent,
582 struct ib_mad_snoop_private,
583 agent);
584 unregister_mad_snoop(mad_snoop_priv);
585 }
586 return 0;
587 }
588 EXPORT_SYMBOL(ib_unregister_mad_agent);
589
590 static void dequeue_mad(struct ib_mad_list_head *mad_list)
591 {
592 struct ib_mad_queue *mad_queue;
593 unsigned long flags;
594
595 BUG_ON(!mad_list->mad_queue);
596 mad_queue = mad_list->mad_queue;
597 spin_lock_irqsave(&mad_queue->lock, flags);
598 list_del(&mad_list->list);
599 mad_queue->count--;
600 spin_unlock_irqrestore(&mad_queue->lock, flags);
601 }
602
603 static void snoop_send(struct ib_mad_qp_info *qp_info,
604 struct ib_mad_send_buf *send_buf,
605 struct ib_mad_send_wc *mad_send_wc,
606 int mad_snoop_flags)
607 {
608 struct ib_mad_snoop_private *mad_snoop_priv;
609 unsigned long flags;
610 int i;
611
612 spin_lock_irqsave(&qp_info->snoop_lock, flags);
613 for (i = 0; i < qp_info->snoop_table_size; i++) {
614 mad_snoop_priv = qp_info->snoop_table[i];
615 if (!mad_snoop_priv ||
616 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
617 continue;
618
619 atomic_inc(&mad_snoop_priv->refcount);
620 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
621 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
622 send_buf, mad_send_wc);
623 deref_snoop_agent(mad_snoop_priv);
624 spin_lock_irqsave(&qp_info->snoop_lock, flags);
625 }
626 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
627 }
628
629 static void snoop_recv(struct ib_mad_qp_info *qp_info,
630 struct ib_mad_recv_wc *mad_recv_wc,
631 int mad_snoop_flags)
632 {
633 struct ib_mad_snoop_private *mad_snoop_priv;
634 unsigned long flags;
635 int i;
636
637 spin_lock_irqsave(&qp_info->snoop_lock, flags);
638 for (i = 0; i < qp_info->snoop_table_size; i++) {
639 mad_snoop_priv = qp_info->snoop_table[i];
640 if (!mad_snoop_priv ||
641 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
642 continue;
643
644 atomic_inc(&mad_snoop_priv->refcount);
645 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
646 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
647 mad_recv_wc);
648 deref_snoop_agent(mad_snoop_priv);
649 spin_lock_irqsave(&qp_info->snoop_lock, flags);
650 }
651 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
652 }
653
654 static void build_smp_wc(struct ib_qp *qp,
655 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
656 struct ib_wc *wc)
657 {
658 memset(wc, 0, sizeof *wc);
659 wc->wr_id = wr_id;
660 wc->status = IB_WC_SUCCESS;
661 wc->opcode = IB_WC_RECV;
662 wc->pkey_index = pkey_index;
663 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
664 wc->src_qp = IB_QP0;
665 wc->qp = qp;
666 wc->slid = slid;
667 wc->sl = 0;
668 wc->dlid_path_bits = 0;
669 wc->port_num = port_num;
670 }
671
672 /*
673 * Return 0 if SMP is to be sent
674 * Return 1 if SMP was consumed locally (whether or not solicited)
675 * Return < 0 if error
676 */
677 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
678 struct ib_mad_send_wr_private *mad_send_wr)
679 {
680 int ret = 0;
681 struct ib_smp *smp = mad_send_wr->send_buf.mad;
682 unsigned long flags;
683 struct ib_mad_local_private *local;
684 struct ib_mad_private *mad_priv;
685 struct ib_mad_port_private *port_priv;
686 struct ib_mad_agent_private *recv_mad_agent = NULL;
687 struct ib_device *device = mad_agent_priv->agent.device;
688 u8 port_num;
689 struct ib_wc mad_wc;
690 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
691
692 if (device->node_type == RDMA_NODE_IB_SWITCH &&
693 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
694 port_num = send_wr->wr.ud.port_num;
695 else
696 port_num = mad_agent_priv->agent.port_num;
697
698 /*
699 * Directed route handling starts if the initial LID routed part of
700 * a request or the ending LID routed part of a response is empty.
701 * If we are at the start of the LID routed part, don't update the
702 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
703 */
704 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
705 IB_LID_PERMISSIVE &&
706 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
707 IB_SMI_DISCARD) {
708 ret = -EINVAL;
709 printk(KERN_ERR PFX "Invalid directed route\n");
710 goto out;
711 }
712
713 /* Check to post send on QP or process locally */
714 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
715 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
716 goto out;
717
718 local = kmalloc(sizeof *local, GFP_ATOMIC);
719 if (!local) {
720 ret = -ENOMEM;
721 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
722 goto out;
723 }
724 local->mad_priv = NULL;
725 local->recv_mad_agent = NULL;
726 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
727 if (!mad_priv) {
728 ret = -ENOMEM;
729 printk(KERN_ERR PFX "No memory for local response MAD\n");
730 kfree(local);
731 goto out;
732 }
733
734 build_smp_wc(mad_agent_priv->agent.qp,
735 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
736 send_wr->wr.ud.pkey_index,
737 send_wr->wr.ud.port_num, &mad_wc);
738
739 /* No GRH for DR SMP */
740 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
741 (struct ib_mad *)smp,
742 (struct ib_mad *)&mad_priv->mad);
743 switch (ret)
744 {
745 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
746 if (ib_response_mad(&mad_priv->mad.mad) &&
747 mad_agent_priv->agent.recv_handler) {
748 local->mad_priv = mad_priv;
749 local->recv_mad_agent = mad_agent_priv;
750 /*
751 * Reference MAD agent until receive
752 * side of local completion handled
753 */
754 atomic_inc(&mad_agent_priv->refcount);
755 } else
756 kmem_cache_free(ib_mad_cache, mad_priv);
757 break;
758 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
759 kmem_cache_free(ib_mad_cache, mad_priv);
760 break;
761 case IB_MAD_RESULT_SUCCESS:
762 /* Treat like an incoming receive MAD */
763 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
764 mad_agent_priv->agent.port_num);
765 if (port_priv) {
766 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
767 recv_mad_agent = find_mad_agent(port_priv,
768 &mad_priv->mad.mad);
769 }
770 if (!port_priv || !recv_mad_agent) {
771 /*
772 * No receiving agent so drop packet and
773 * generate send completion.
774 */
775 kmem_cache_free(ib_mad_cache, mad_priv);
776 break;
777 }
778 local->mad_priv = mad_priv;
779 local->recv_mad_agent = recv_mad_agent;
780 break;
781 default:
782 kmem_cache_free(ib_mad_cache, mad_priv);
783 kfree(local);
784 ret = -EINVAL;
785 goto out;
786 }
787
788 local->mad_send_wr = mad_send_wr;
789 /* Reference MAD agent until send side of local completion handled */
790 atomic_inc(&mad_agent_priv->refcount);
791 /* Queue local completion to local list */
792 spin_lock_irqsave(&mad_agent_priv->lock, flags);
793 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
794 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
795 queue_work(mad_agent_priv->qp_info->port_priv->wq,
796 &mad_agent_priv->local_work);
797 ret = 1;
798 out:
799 return ret;
800 }
801
802 static int get_pad_size(int hdr_len, int data_len)
803 {
804 int seg_size, pad;
805
806 seg_size = sizeof(struct ib_mad) - hdr_len;
807 if (data_len && seg_size) {
808 pad = seg_size - data_len % seg_size;
809 return pad == seg_size ? 0 : pad;
810 } else
811 return seg_size;
812 }
813
814 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
815 {
816 struct ib_rmpp_segment *s, *t;
817
818 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
819 list_del(&s->list);
820 kfree(s);
821 }
822 }
823
824 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
825 gfp_t gfp_mask)
826 {
827 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
828 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
829 struct ib_rmpp_segment *seg = NULL;
830 int left, seg_size, pad;
831
832 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
833 seg_size = send_buf->seg_size;
834 pad = send_wr->pad;
835
836 /* Allocate data segments. */
837 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
838 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
839 if (!seg) {
840 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
841 "alloc failed for len %zd, gfp %#x\n",
842 sizeof (*seg) + seg_size, gfp_mask);
843 free_send_rmpp_list(send_wr);
844 return -ENOMEM;
845 }
846 seg->num = ++send_buf->seg_count;
847 list_add_tail(&seg->list, &send_wr->rmpp_list);
848 }
849
850 /* Zero any padding */
851 if (pad)
852 memset(seg->data + seg_size - pad, 0, pad);
853
854 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
855 agent.rmpp_version;
856 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
857 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
858
859 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
860 struct ib_rmpp_segment, list);
861 send_wr->last_ack_seg = send_wr->cur_seg;
862 return 0;
863 }
864
865 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
866 u32 remote_qpn, u16 pkey_index,
867 int rmpp_active,
868 int hdr_len, int data_len,
869 gfp_t gfp_mask)
870 {
871 struct ib_mad_agent_private *mad_agent_priv;
872 struct ib_mad_send_wr_private *mad_send_wr;
873 int pad, message_size, ret, size;
874 void *buf;
875
876 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
877 agent);
878 pad = get_pad_size(hdr_len, data_len);
879 message_size = hdr_len + data_len + pad;
880
881 if ((!mad_agent->rmpp_version &&
882 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
883 (!rmpp_active && message_size > sizeof(struct ib_mad)))
884 return ERR_PTR(-EINVAL);
885
886 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
887 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
888 if (!buf)
889 return ERR_PTR(-ENOMEM);
890
891 mad_send_wr = buf + size;
892 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
893 mad_send_wr->send_buf.mad = buf;
894 mad_send_wr->send_buf.hdr_len = hdr_len;
895 mad_send_wr->send_buf.data_len = data_len;
896 mad_send_wr->pad = pad;
897
898 mad_send_wr->mad_agent_priv = mad_agent_priv;
899 mad_send_wr->sg_list[0].length = hdr_len;
900 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
901 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
902 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
903
904 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
905 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
906 mad_send_wr->send_wr.num_sge = 2;
907 mad_send_wr->send_wr.opcode = IB_WR_SEND;
908 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
909 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
910 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
911 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
912
913 if (rmpp_active) {
914 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
915 if (ret) {
916 kfree(buf);
917 return ERR_PTR(ret);
918 }
919 }
920
921 mad_send_wr->send_buf.mad_agent = mad_agent;
922 atomic_inc(&mad_agent_priv->refcount);
923 return &mad_send_wr->send_buf;
924 }
925 EXPORT_SYMBOL(ib_create_send_mad);
926
927 int ib_get_mad_data_offset(u8 mgmt_class)
928 {
929 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
930 return IB_MGMT_SA_HDR;
931 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
932 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
933 (mgmt_class == IB_MGMT_CLASS_BIS))
934 return IB_MGMT_DEVICE_HDR;
935 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
936 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
937 return IB_MGMT_VENDOR_HDR;
938 else
939 return IB_MGMT_MAD_HDR;
940 }
941 EXPORT_SYMBOL(ib_get_mad_data_offset);
942
943 int ib_is_mad_class_rmpp(u8 mgmt_class)
944 {
945 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
946 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
947 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
948 (mgmt_class == IB_MGMT_CLASS_BIS) ||
949 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
950 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
951 return 1;
952 return 0;
953 }
954 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
955
956 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
957 {
958 struct ib_mad_send_wr_private *mad_send_wr;
959 struct list_head *list;
960
961 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
962 send_buf);
963 list = &mad_send_wr->cur_seg->list;
964
965 if (mad_send_wr->cur_seg->num < seg_num) {
966 list_for_each_entry(mad_send_wr->cur_seg, list, list)
967 if (mad_send_wr->cur_seg->num == seg_num)
968 break;
969 } else if (mad_send_wr->cur_seg->num > seg_num) {
970 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
971 if (mad_send_wr->cur_seg->num == seg_num)
972 break;
973 }
974 return mad_send_wr->cur_seg->data;
975 }
976 EXPORT_SYMBOL(ib_get_rmpp_segment);
977
978 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
979 {
980 if (mad_send_wr->send_buf.seg_count)
981 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
982 mad_send_wr->seg_num);
983 else
984 return mad_send_wr->send_buf.mad +
985 mad_send_wr->send_buf.hdr_len;
986 }
987
988 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
989 {
990 struct ib_mad_agent_private *mad_agent_priv;
991 struct ib_mad_send_wr_private *mad_send_wr;
992
993 mad_agent_priv = container_of(send_buf->mad_agent,
994 struct ib_mad_agent_private, agent);
995 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
996 send_buf);
997
998 free_send_rmpp_list(mad_send_wr);
999 kfree(send_buf->mad);
1000 deref_mad_agent(mad_agent_priv);
1001 }
1002 EXPORT_SYMBOL(ib_free_send_mad);
1003
1004 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1005 {
1006 struct ib_mad_qp_info *qp_info;
1007 struct list_head *list;
1008 struct ib_send_wr *bad_send_wr;
1009 struct ib_mad_agent *mad_agent;
1010 struct ib_sge *sge;
1011 unsigned long flags;
1012 int ret;
1013
1014 /* Set WR ID to find mad_send_wr upon completion */
1015 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1016 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1017 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1018
1019 mad_agent = mad_send_wr->send_buf.mad_agent;
1020 sge = mad_send_wr->sg_list;
1021 sge[0].addr = ib_dma_map_single(mad_agent->device,
1022 mad_send_wr->send_buf.mad,
1023 sge[0].length,
1024 DMA_TO_DEVICE);
1025 mad_send_wr->header_mapping = sge[0].addr;
1026
1027 sge[1].addr = ib_dma_map_single(mad_agent->device,
1028 ib_get_payload(mad_send_wr),
1029 sge[1].length,
1030 DMA_TO_DEVICE);
1031 mad_send_wr->payload_mapping = sge[1].addr;
1032
1033 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1034 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1035 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1036 &bad_send_wr);
1037 list = &qp_info->send_queue.list;
1038 } else {
1039 ret = 0;
1040 list = &qp_info->overflow_list;
1041 }
1042
1043 if (!ret) {
1044 qp_info->send_queue.count++;
1045 list_add_tail(&mad_send_wr->mad_list.list, list);
1046 }
1047 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1048 if (ret) {
1049 ib_dma_unmap_single(mad_agent->device,
1050 mad_send_wr->header_mapping,
1051 sge[0].length, DMA_TO_DEVICE);
1052 ib_dma_unmap_single(mad_agent->device,
1053 mad_send_wr->payload_mapping,
1054 sge[1].length, DMA_TO_DEVICE);
1055 }
1056 return ret;
1057 }
1058
1059 /*
1060 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1061 * with the registered client
1062 */
1063 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1064 struct ib_mad_send_buf **bad_send_buf)
1065 {
1066 struct ib_mad_agent_private *mad_agent_priv;
1067 struct ib_mad_send_buf *next_send_buf;
1068 struct ib_mad_send_wr_private *mad_send_wr;
1069 unsigned long flags;
1070 int ret = -EINVAL;
1071
1072 /* Walk list of send WRs and post each on send list */
1073 for (; send_buf; send_buf = next_send_buf) {
1074
1075 mad_send_wr = container_of(send_buf,
1076 struct ib_mad_send_wr_private,
1077 send_buf);
1078 mad_agent_priv = mad_send_wr->mad_agent_priv;
1079
1080 if (!send_buf->mad_agent->send_handler ||
1081 (send_buf->timeout_ms &&
1082 !send_buf->mad_agent->recv_handler)) {
1083 ret = -EINVAL;
1084 goto error;
1085 }
1086
1087 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1088 if (mad_agent_priv->agent.rmpp_version) {
1089 ret = -EINVAL;
1090 goto error;
1091 }
1092 }
1093
1094 /*
1095 * Save pointer to next work request to post in case the
1096 * current one completes, and the user modifies the work
1097 * request associated with the completion
1098 */
1099 next_send_buf = send_buf->next;
1100 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1101
1102 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1103 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1104 ret = handle_outgoing_dr_smp(mad_agent_priv,
1105 mad_send_wr);
1106 if (ret < 0) /* error */
1107 goto error;
1108 else if (ret == 1) /* locally consumed */
1109 continue;
1110 }
1111
1112 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1113 /* Timeout will be updated after send completes */
1114 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1115 mad_send_wr->max_retries = send_buf->retries;
1116 mad_send_wr->retries_left = send_buf->retries;
1117 send_buf->retries = 0;
1118 /* Reference for work request to QP + response */
1119 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1120 mad_send_wr->status = IB_WC_SUCCESS;
1121
1122 /* Reference MAD agent until send completes */
1123 atomic_inc(&mad_agent_priv->refcount);
1124 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1125 list_add_tail(&mad_send_wr->agent_list,
1126 &mad_agent_priv->send_list);
1127 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1128
1129 if (mad_agent_priv->agent.rmpp_version) {
1130 ret = ib_send_rmpp_mad(mad_send_wr);
1131 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1132 ret = ib_send_mad(mad_send_wr);
1133 } else
1134 ret = ib_send_mad(mad_send_wr);
1135 if (ret < 0) {
1136 /* Fail send request */
1137 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1138 list_del(&mad_send_wr->agent_list);
1139 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1140 atomic_dec(&mad_agent_priv->refcount);
1141 goto error;
1142 }
1143 }
1144 return 0;
1145 error:
1146 if (bad_send_buf)
1147 *bad_send_buf = send_buf;
1148 return ret;
1149 }
1150 EXPORT_SYMBOL(ib_post_send_mad);
1151
1152 /*
1153 * ib_free_recv_mad - Returns data buffers used to receive
1154 * a MAD to the access layer
1155 */
1156 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1157 {
1158 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1159 struct ib_mad_private_header *mad_priv_hdr;
1160 struct ib_mad_private *priv;
1161 struct list_head free_list;
1162
1163 INIT_LIST_HEAD(&free_list);
1164 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1165
1166 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1167 &free_list, list) {
1168 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1169 recv_buf);
1170 mad_priv_hdr = container_of(mad_recv_wc,
1171 struct ib_mad_private_header,
1172 recv_wc);
1173 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1174 header);
1175 kmem_cache_free(ib_mad_cache, priv);
1176 }
1177 }
1178 EXPORT_SYMBOL(ib_free_recv_mad);
1179
1180 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1181 u8 rmpp_version,
1182 ib_mad_send_handler send_handler,
1183 ib_mad_recv_handler recv_handler,
1184 void *context)
1185 {
1186 return ERR_PTR(-EINVAL); /* XXX: for now */
1187 }
1188 EXPORT_SYMBOL(ib_redirect_mad_qp);
1189
1190 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1191 struct ib_wc *wc)
1192 {
1193 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1194 return 0;
1195 }
1196 EXPORT_SYMBOL(ib_process_mad_wc);
1197
1198 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1199 struct ib_mad_reg_req *mad_reg_req)
1200 {
1201 int i;
1202
1203 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1204 if ((*method)->agent[i]) {
1205 printk(KERN_ERR PFX "Method %d already in use\n", i);
1206 return -EINVAL;
1207 }
1208 }
1209 return 0;
1210 }
1211
1212 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1213 {
1214 /* Allocate management method table */
1215 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1216 if (!*method) {
1217 printk(KERN_ERR PFX "No memory for "
1218 "ib_mad_mgmt_method_table\n");
1219 return -ENOMEM;
1220 }
1221
1222 return 0;
1223 }
1224
1225 /*
1226 * Check to see if there are any methods still in use
1227 */
1228 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1229 {
1230 int i;
1231
1232 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1233 if (method->agent[i])
1234 return 1;
1235 return 0;
1236 }
1237
1238 /*
1239 * Check to see if there are any method tables for this class still in use
1240 */
1241 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1242 {
1243 int i;
1244
1245 for (i = 0; i < MAX_MGMT_CLASS; i++)
1246 if (class->method_table[i])
1247 return 1;
1248 return 0;
1249 }
1250
1251 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1252 {
1253 int i;
1254
1255 for (i = 0; i < MAX_MGMT_OUI; i++)
1256 if (vendor_class->method_table[i])
1257 return 1;
1258 return 0;
1259 }
1260
1261 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1262 char *oui)
1263 {
1264 int i;
1265
1266 for (i = 0; i < MAX_MGMT_OUI; i++)
1267 /* Is there matching OUI for this vendor class ? */
1268 if (!memcmp(vendor_class->oui[i], oui, 3))
1269 return i;
1270
1271 return -1;
1272 }
1273
1274 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1275 {
1276 int i;
1277
1278 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1279 if (vendor->vendor_class[i])
1280 return 1;
1281
1282 return 0;
1283 }
1284
1285 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1286 struct ib_mad_agent_private *agent)
1287 {
1288 int i;
1289
1290 /* Remove any methods for this mad agent */
1291 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1292 if (method->agent[i] == agent) {
1293 method->agent[i] = NULL;
1294 }
1295 }
1296 }
1297
1298 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1299 struct ib_mad_agent_private *agent_priv,
1300 u8 mgmt_class)
1301 {
1302 struct ib_mad_port_private *port_priv;
1303 struct ib_mad_mgmt_class_table **class;
1304 struct ib_mad_mgmt_method_table **method;
1305 int i, ret;
1306
1307 port_priv = agent_priv->qp_info->port_priv;
1308 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1309 if (!*class) {
1310 /* Allocate management class table for "new" class version */
1311 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1312 if (!*class) {
1313 printk(KERN_ERR PFX "No memory for "
1314 "ib_mad_mgmt_class_table\n");
1315 ret = -ENOMEM;
1316 goto error1;
1317 }
1318
1319 /* Allocate method table for this management class */
1320 method = &(*class)->method_table[mgmt_class];
1321 if ((ret = allocate_method_table(method)))
1322 goto error2;
1323 } else {
1324 method = &(*class)->method_table[mgmt_class];
1325 if (!*method) {
1326 /* Allocate method table for this management class */
1327 if ((ret = allocate_method_table(method)))
1328 goto error1;
1329 }
1330 }
1331
1332 /* Now, make sure methods are not already in use */
1333 if (method_in_use(method, mad_reg_req))
1334 goto error3;
1335
1336 /* Finally, add in methods being registered */
1337 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1338 (*method)->agent[i] = agent_priv;
1339
1340 return 0;
1341
1342 error3:
1343 /* Remove any methods for this mad agent */
1344 remove_methods_mad_agent(*method, agent_priv);
1345 /* Now, check to see if there are any methods in use */
1346 if (!check_method_table(*method)) {
1347 /* If not, release management method table */
1348 kfree(*method);
1349 *method = NULL;
1350 }
1351 ret = -EINVAL;
1352 goto error1;
1353 error2:
1354 kfree(*class);
1355 *class = NULL;
1356 error1:
1357 return ret;
1358 }
1359
1360 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1361 struct ib_mad_agent_private *agent_priv)
1362 {
1363 struct ib_mad_port_private *port_priv;
1364 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1365 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1366 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1367 struct ib_mad_mgmt_method_table **method;
1368 int i, ret = -ENOMEM;
1369 u8 vclass;
1370
1371 /* "New" vendor (with OUI) class */
1372 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1373 port_priv = agent_priv->qp_info->port_priv;
1374 vendor_table = &port_priv->version[
1375 mad_reg_req->mgmt_class_version].vendor;
1376 if (!*vendor_table) {
1377 /* Allocate mgmt vendor class table for "new" class version */
1378 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1379 if (!vendor) {
1380 printk(KERN_ERR PFX "No memory for "
1381 "ib_mad_mgmt_vendor_class_table\n");
1382 goto error1;
1383 }
1384
1385 *vendor_table = vendor;
1386 }
1387 if (!(*vendor_table)->vendor_class[vclass]) {
1388 /* Allocate table for this management vendor class */
1389 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1390 if (!vendor_class) {
1391 printk(KERN_ERR PFX "No memory for "
1392 "ib_mad_mgmt_vendor_class\n");
1393 goto error2;
1394 }
1395
1396 (*vendor_table)->vendor_class[vclass] = vendor_class;
1397 }
1398 for (i = 0; i < MAX_MGMT_OUI; i++) {
1399 /* Is there matching OUI for this vendor class ? */
1400 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1401 mad_reg_req->oui, 3)) {
1402 method = &(*vendor_table)->vendor_class[
1403 vclass]->method_table[i];
1404 BUG_ON(!*method);
1405 goto check_in_use;
1406 }
1407 }
1408 for (i = 0; i < MAX_MGMT_OUI; i++) {
1409 /* OUI slot available ? */
1410 if (!is_vendor_oui((*vendor_table)->vendor_class[
1411 vclass]->oui[i])) {
1412 method = &(*vendor_table)->vendor_class[
1413 vclass]->method_table[i];
1414 BUG_ON(*method);
1415 /* Allocate method table for this OUI */
1416 if ((ret = allocate_method_table(method)))
1417 goto error3;
1418 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1419 mad_reg_req->oui, 3);
1420 goto check_in_use;
1421 }
1422 }
1423 printk(KERN_ERR PFX "All OUI slots in use\n");
1424 goto error3;
1425
1426 check_in_use:
1427 /* Now, make sure methods are not already in use */
1428 if (method_in_use(method, mad_reg_req))
1429 goto error4;
1430
1431 /* Finally, add in methods being registered */
1432 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1433 (*method)->agent[i] = agent_priv;
1434
1435 return 0;
1436
1437 error4:
1438 /* Remove any methods for this mad agent */
1439 remove_methods_mad_agent(*method, agent_priv);
1440 /* Now, check to see if there are any methods in use */
1441 if (!check_method_table(*method)) {
1442 /* If not, release management method table */
1443 kfree(*method);
1444 *method = NULL;
1445 }
1446 ret = -EINVAL;
1447 error3:
1448 if (vendor_class) {
1449 (*vendor_table)->vendor_class[vclass] = NULL;
1450 kfree(vendor_class);
1451 }
1452 error2:
1453 if (vendor) {
1454 *vendor_table = NULL;
1455 kfree(vendor);
1456 }
1457 error1:
1458 return ret;
1459 }
1460
1461 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1462 {
1463 struct ib_mad_port_private *port_priv;
1464 struct ib_mad_mgmt_class_table *class;
1465 struct ib_mad_mgmt_method_table *method;
1466 struct ib_mad_mgmt_vendor_class_table *vendor;
1467 struct ib_mad_mgmt_vendor_class *vendor_class;
1468 int index;
1469 u8 mgmt_class;
1470
1471 /*
1472 * Was MAD registration request supplied
1473 * with original registration ?
1474 */
1475 if (!agent_priv->reg_req) {
1476 goto out;
1477 }
1478
1479 port_priv = agent_priv->qp_info->port_priv;
1480 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1481 class = port_priv->version[
1482 agent_priv->reg_req->mgmt_class_version].class;
1483 if (!class)
1484 goto vendor_check;
1485
1486 method = class->method_table[mgmt_class];
1487 if (method) {
1488 /* Remove any methods for this mad agent */
1489 remove_methods_mad_agent(method, agent_priv);
1490 /* Now, check to see if there are any methods still in use */
1491 if (!check_method_table(method)) {
1492 /* If not, release management method table */
1493 kfree(method);
1494 class->method_table[mgmt_class] = NULL;
1495 /* Any management classes left ? */
1496 if (!check_class_table(class)) {
1497 /* If not, release management class table */
1498 kfree(class);
1499 port_priv->version[
1500 agent_priv->reg_req->
1501 mgmt_class_version].class = NULL;
1502 }
1503 }
1504 }
1505
1506 vendor_check:
1507 if (!is_vendor_class(mgmt_class))
1508 goto out;
1509
1510 /* normalize mgmt_class to vendor range 2 */
1511 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1512 vendor = port_priv->version[
1513 agent_priv->reg_req->mgmt_class_version].vendor;
1514
1515 if (!vendor)
1516 goto out;
1517
1518 vendor_class = vendor->vendor_class[mgmt_class];
1519 if (vendor_class) {
1520 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1521 if (index < 0)
1522 goto out;
1523 method = vendor_class->method_table[index];
1524 if (method) {
1525 /* Remove any methods for this mad agent */
1526 remove_methods_mad_agent(method, agent_priv);
1527 /*
1528 * Now, check to see if there are
1529 * any methods still in use
1530 */
1531 if (!check_method_table(method)) {
1532 /* If not, release management method table */
1533 kfree(method);
1534 vendor_class->method_table[index] = NULL;
1535 memset(vendor_class->oui[index], 0, 3);
1536 /* Any OUIs left ? */
1537 if (!check_vendor_class(vendor_class)) {
1538 /* If not, release vendor class table */
1539 kfree(vendor_class);
1540 vendor->vendor_class[mgmt_class] = NULL;
1541 /* Any other vendor classes left ? */
1542 if (!check_vendor_table(vendor)) {
1543 kfree(vendor);
1544 port_priv->version[
1545 agent_priv->reg_req->
1546 mgmt_class_version].
1547 vendor = NULL;
1548 }
1549 }
1550 }
1551 }
1552 }
1553
1554 out:
1555 return;
1556 }
1557
1558 static struct ib_mad_agent_private *
1559 find_mad_agent(struct ib_mad_port_private *port_priv,
1560 struct ib_mad *mad)
1561 {
1562 struct ib_mad_agent_private *mad_agent = NULL;
1563 unsigned long flags;
1564
1565 spin_lock_irqsave(&port_priv->reg_lock, flags);
1566 if (ib_response_mad(mad)) {
1567 u32 hi_tid;
1568 struct ib_mad_agent_private *entry;
1569
1570 /*
1571 * Routing is based on high 32 bits of transaction ID
1572 * of MAD.
1573 */
1574 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1575 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1576 if (entry->agent.hi_tid == hi_tid) {
1577 mad_agent = entry;
1578 break;
1579 }
1580 }
1581 } else {
1582 struct ib_mad_mgmt_class_table *class;
1583 struct ib_mad_mgmt_method_table *method;
1584 struct ib_mad_mgmt_vendor_class_table *vendor;
1585 struct ib_mad_mgmt_vendor_class *vendor_class;
1586 struct ib_vendor_mad *vendor_mad;
1587 int index;
1588
1589 /*
1590 * Routing is based on version, class, and method
1591 * For "newer" vendor MADs, also based on OUI
1592 */
1593 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1594 goto out;
1595 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1596 class = port_priv->version[
1597 mad->mad_hdr.class_version].class;
1598 if (!class)
1599 goto out;
1600 method = class->method_table[convert_mgmt_class(
1601 mad->mad_hdr.mgmt_class)];
1602 if (method)
1603 mad_agent = method->agent[mad->mad_hdr.method &
1604 ~IB_MGMT_METHOD_RESP];
1605 } else {
1606 vendor = port_priv->version[
1607 mad->mad_hdr.class_version].vendor;
1608 if (!vendor)
1609 goto out;
1610 vendor_class = vendor->vendor_class[vendor_class_index(
1611 mad->mad_hdr.mgmt_class)];
1612 if (!vendor_class)
1613 goto out;
1614 /* Find matching OUI */
1615 vendor_mad = (struct ib_vendor_mad *)mad;
1616 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1617 if (index == -1)
1618 goto out;
1619 method = vendor_class->method_table[index];
1620 if (method) {
1621 mad_agent = method->agent[mad->mad_hdr.method &
1622 ~IB_MGMT_METHOD_RESP];
1623 }
1624 }
1625 }
1626
1627 if (mad_agent) {
1628 if (mad_agent->agent.recv_handler)
1629 atomic_inc(&mad_agent->refcount);
1630 else {
1631 printk(KERN_NOTICE PFX "No receive handler for client "
1632 "%p on port %d\n",
1633 &mad_agent->agent, port_priv->port_num);
1634 mad_agent = NULL;
1635 }
1636 }
1637 out:
1638 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1639
1640 return mad_agent;
1641 }
1642
1643 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1644 {
1645 int valid = 0;
1646
1647 /* Make sure MAD base version is understood */
1648 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1649 printk(KERN_ERR PFX "MAD received with unsupported base "
1650 "version %d\n", mad->mad_hdr.base_version);
1651 goto out;
1652 }
1653
1654 /* Filter SMI packets sent to other than QP0 */
1655 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1656 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1657 if (qp_num == 0)
1658 valid = 1;
1659 } else {
1660 /* Filter GSI packets sent to QP0 */
1661 if (qp_num != 0)
1662 valid = 1;
1663 }
1664
1665 out:
1666 return valid;
1667 }
1668
1669 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1670 struct ib_mad_hdr *mad_hdr)
1671 {
1672 struct ib_rmpp_mad *rmpp_mad;
1673
1674 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1675 return !mad_agent_priv->agent.rmpp_version ||
1676 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1677 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1678 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1679 }
1680
1681 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1682 struct ib_mad_recv_wc *rwc)
1683 {
1684 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1685 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1686 }
1687
1688 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1689 struct ib_mad_send_wr_private *wr,
1690 struct ib_mad_recv_wc *rwc )
1691 {
1692 struct ib_ah_attr attr;
1693 u8 send_resp, rcv_resp;
1694 union ib_gid sgid;
1695 struct ib_device *device = mad_agent_priv->agent.device;
1696 u8 port_num = mad_agent_priv->agent.port_num;
1697 u8 lmc;
1698
1699 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1700 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1701
1702 if (send_resp == rcv_resp)
1703 /* both requests, or both responses. GIDs different */
1704 return 0;
1705
1706 if (ib_query_ah(wr->send_buf.ah, &attr))
1707 /* Assume not equal, to avoid false positives. */
1708 return 0;
1709
1710 if (!!(attr.ah_flags & IB_AH_GRH) !=
1711 !!(rwc->wc->wc_flags & IB_WC_GRH))
1712 /* one has GID, other does not. Assume different */
1713 return 0;
1714
1715 if (!send_resp && rcv_resp) {
1716 /* is request/response. */
1717 if (!(attr.ah_flags & IB_AH_GRH)) {
1718 if (ib_get_cached_lmc(device, port_num, &lmc))
1719 return 0;
1720 return (!lmc || !((attr.src_path_bits ^
1721 rwc->wc->dlid_path_bits) &
1722 ((1 << lmc) - 1)));
1723 } else {
1724 if (ib_get_cached_gid(device, port_num,
1725 attr.grh.sgid_index, &sgid))
1726 return 0;
1727 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1728 16);
1729 }
1730 }
1731
1732 if (!(attr.ah_flags & IB_AH_GRH))
1733 return attr.dlid == rwc->wc->slid;
1734 else
1735 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1736 16);
1737 }
1738
1739 static inline int is_direct(u8 class)
1740 {
1741 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1742 }
1743
1744 struct ib_mad_send_wr_private*
1745 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1746 struct ib_mad_recv_wc *wc)
1747 {
1748 struct ib_mad_send_wr_private *wr;
1749 struct ib_mad *mad;
1750
1751 mad = (struct ib_mad *)wc->recv_buf.mad;
1752
1753 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1754 if ((wr->tid == mad->mad_hdr.tid) &&
1755 rcv_has_same_class(wr, wc) &&
1756 /*
1757 * Don't check GID for direct routed MADs.
1758 * These might have permissive LIDs.
1759 */
1760 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1761 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1762 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1763 }
1764
1765 /*
1766 * It's possible to receive the response before we've
1767 * been notified that the send has completed
1768 */
1769 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1770 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1771 wr->tid == mad->mad_hdr.tid &&
1772 wr->timeout &&
1773 rcv_has_same_class(wr, wc) &&
1774 /*
1775 * Don't check GID for direct routed MADs.
1776 * These might have permissive LIDs.
1777 */
1778 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1779 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1780 /* Verify request has not been canceled */
1781 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1782 }
1783 return NULL;
1784 }
1785
1786 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1787 {
1788 mad_send_wr->timeout = 0;
1789 if (mad_send_wr->refcount == 1)
1790 list_move_tail(&mad_send_wr->agent_list,
1791 &mad_send_wr->mad_agent_priv->done_list);
1792 }
1793
1794 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1795 struct ib_mad_recv_wc *mad_recv_wc)
1796 {
1797 struct ib_mad_send_wr_private *mad_send_wr;
1798 struct ib_mad_send_wc mad_send_wc;
1799 unsigned long flags;
1800
1801 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1802 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1803 if (mad_agent_priv->agent.rmpp_version) {
1804 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1805 mad_recv_wc);
1806 if (!mad_recv_wc) {
1807 deref_mad_agent(mad_agent_priv);
1808 return;
1809 }
1810 }
1811
1812 /* Complete corresponding request */
1813 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1814 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1815 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1816 if (!mad_send_wr) {
1817 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1818 ib_free_recv_mad(mad_recv_wc);
1819 deref_mad_agent(mad_agent_priv);
1820 return;
1821 }
1822 ib_mark_mad_done(mad_send_wr);
1823 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1824
1825 /* Defined behavior is to complete response before request */
1826 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1827 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1828 mad_recv_wc);
1829 atomic_dec(&mad_agent_priv->refcount);
1830
1831 mad_send_wc.status = IB_WC_SUCCESS;
1832 mad_send_wc.vendor_err = 0;
1833 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1834 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1835 } else {
1836 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1837 mad_recv_wc);
1838 deref_mad_agent(mad_agent_priv);
1839 }
1840 }
1841
1842 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1843 struct ib_wc *wc)
1844 {
1845 struct ib_mad_qp_info *qp_info;
1846 struct ib_mad_private_header *mad_priv_hdr;
1847 struct ib_mad_private *recv, *response = NULL;
1848 struct ib_mad_list_head *mad_list;
1849 struct ib_mad_agent_private *mad_agent;
1850 int port_num;
1851
1852 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1853 qp_info = mad_list->mad_queue->qp_info;
1854 dequeue_mad(mad_list);
1855
1856 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1857 mad_list);
1858 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1859 ib_dma_unmap_single(port_priv->device,
1860 recv->header.mapping,
1861 sizeof(struct ib_mad_private) -
1862 sizeof(struct ib_mad_private_header),
1863 DMA_FROM_DEVICE);
1864
1865 /* Setup MAD receive work completion from "normal" work completion */
1866 recv->header.wc = *wc;
1867 recv->header.recv_wc.wc = &recv->header.wc;
1868 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1869 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1870 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1871
1872 if (atomic_read(&qp_info->snoop_count))
1873 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1874
1875 /* Validate MAD */
1876 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1877 goto out;
1878
1879 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1880 if (!response) {
1881 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1882 "for response buffer\n");
1883 goto out;
1884 }
1885
1886 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1887 port_num = wc->port_num;
1888 else
1889 port_num = port_priv->port_num;
1890
1891 if (recv->mad.mad.mad_hdr.mgmt_class ==
1892 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1893 enum smi_forward_action retsmi;
1894
1895 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1896 port_priv->device->node_type,
1897 port_num,
1898 port_priv->device->phys_port_cnt) ==
1899 IB_SMI_DISCARD)
1900 goto out;
1901
1902 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1903 if (retsmi == IB_SMI_LOCAL)
1904 goto local;
1905
1906 if (retsmi == IB_SMI_SEND) { /* don't forward */
1907 if (smi_handle_dr_smp_send(&recv->mad.smp,
1908 port_priv->device->node_type,
1909 port_num) == IB_SMI_DISCARD)
1910 goto out;
1911
1912 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1913 goto out;
1914 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1915 /* forward case for switches */
1916 memcpy(response, recv, sizeof(*response));
1917 response->header.recv_wc.wc = &response->header.wc;
1918 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1919 response->header.recv_wc.recv_buf.grh = &response->grh;
1920
1921 agent_send_response(&response->mad.mad,
1922 &response->grh, wc,
1923 port_priv->device,
1924 smi_get_fwd_port(&recv->mad.smp),
1925 qp_info->qp->qp_num);
1926
1927 goto out;
1928 }
1929 }
1930
1931 local:
1932 /* Give driver "right of first refusal" on incoming MAD */
1933 if (port_priv->device->process_mad) {
1934 int ret;
1935
1936 ret = port_priv->device->process_mad(port_priv->device, 0,
1937 port_priv->port_num,
1938 wc, &recv->grh,
1939 &recv->mad.mad,
1940 &response->mad.mad);
1941 if (ret & IB_MAD_RESULT_SUCCESS) {
1942 if (ret & IB_MAD_RESULT_CONSUMED)
1943 goto out;
1944 if (ret & IB_MAD_RESULT_REPLY) {
1945 agent_send_response(&response->mad.mad,
1946 &recv->grh, wc,
1947 port_priv->device,
1948 port_num,
1949 qp_info->qp->qp_num);
1950 goto out;
1951 }
1952 }
1953 }
1954
1955 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1956 if (mad_agent) {
1957 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1958 /*
1959 * recv is freed up in error cases in ib_mad_complete_recv
1960 * or via recv_handler in ib_mad_complete_recv()
1961 */
1962 recv = NULL;
1963 }
1964
1965 out:
1966 /* Post another receive request for this QP */
1967 if (response) {
1968 ib_mad_post_receive_mads(qp_info, response);
1969 if (recv)
1970 kmem_cache_free(ib_mad_cache, recv);
1971 } else
1972 ib_mad_post_receive_mads(qp_info, recv);
1973 }
1974
1975 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1976 {
1977 struct ib_mad_send_wr_private *mad_send_wr;
1978 unsigned long delay;
1979
1980 if (list_empty(&mad_agent_priv->wait_list)) {
1981 __cancel_delayed_work(&mad_agent_priv->timed_work);
1982 } else {
1983 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1984 struct ib_mad_send_wr_private,
1985 agent_list);
1986
1987 if (time_after(mad_agent_priv->timeout,
1988 mad_send_wr->timeout)) {
1989 mad_agent_priv->timeout = mad_send_wr->timeout;
1990 __cancel_delayed_work(&mad_agent_priv->timed_work);
1991 delay = mad_send_wr->timeout - jiffies;
1992 if ((long)delay <= 0)
1993 delay = 1;
1994 queue_delayed_work(mad_agent_priv->qp_info->
1995 port_priv->wq,
1996 &mad_agent_priv->timed_work, delay);
1997 }
1998 }
1999 }
2000
2001 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2002 {
2003 struct ib_mad_agent_private *mad_agent_priv;
2004 struct ib_mad_send_wr_private *temp_mad_send_wr;
2005 struct list_head *list_item;
2006 unsigned long delay;
2007
2008 mad_agent_priv = mad_send_wr->mad_agent_priv;
2009 list_del(&mad_send_wr->agent_list);
2010
2011 delay = mad_send_wr->timeout;
2012 mad_send_wr->timeout += jiffies;
2013
2014 if (delay) {
2015 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2016 temp_mad_send_wr = list_entry(list_item,
2017 struct ib_mad_send_wr_private,
2018 agent_list);
2019 if (time_after(mad_send_wr->timeout,
2020 temp_mad_send_wr->timeout))
2021 break;
2022 }
2023 }
2024 else
2025 list_item = &mad_agent_priv->wait_list;
2026 list_add(&mad_send_wr->agent_list, list_item);
2027
2028 /* Reschedule a work item if we have a shorter timeout */
2029 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2030 __cancel_delayed_work(&mad_agent_priv->timed_work);
2031 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2032 &mad_agent_priv->timed_work, delay);
2033 }
2034 }
2035
2036 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2037 int timeout_ms)
2038 {
2039 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2040 wait_for_response(mad_send_wr);
2041 }
2042
2043 /*
2044 * Process a send work completion
2045 */
2046 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2047 struct ib_mad_send_wc *mad_send_wc)
2048 {
2049 struct ib_mad_agent_private *mad_agent_priv;
2050 unsigned long flags;
2051 int ret;
2052
2053 mad_agent_priv = mad_send_wr->mad_agent_priv;
2054 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2055 if (mad_agent_priv->agent.rmpp_version) {
2056 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2057 if (ret == IB_RMPP_RESULT_CONSUMED)
2058 goto done;
2059 } else
2060 ret = IB_RMPP_RESULT_UNHANDLED;
2061
2062 if (mad_send_wc->status != IB_WC_SUCCESS &&
2063 mad_send_wr->status == IB_WC_SUCCESS) {
2064 mad_send_wr->status = mad_send_wc->status;
2065 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2066 }
2067
2068 if (--mad_send_wr->refcount > 0) {
2069 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2070 mad_send_wr->status == IB_WC_SUCCESS) {
2071 wait_for_response(mad_send_wr);
2072 }
2073 goto done;
2074 }
2075
2076 /* Remove send from MAD agent and notify client of completion */
2077 list_del(&mad_send_wr->agent_list);
2078 adjust_timeout(mad_agent_priv);
2079 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2080
2081 if (mad_send_wr->status != IB_WC_SUCCESS )
2082 mad_send_wc->status = mad_send_wr->status;
2083 if (ret == IB_RMPP_RESULT_INTERNAL)
2084 ib_rmpp_send_handler(mad_send_wc);
2085 else
2086 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2087 mad_send_wc);
2088
2089 /* Release reference on agent taken when sending */
2090 deref_mad_agent(mad_agent_priv);
2091 return;
2092 done:
2093 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2094 }
2095
2096 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2097 struct ib_wc *wc)
2098 {
2099 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2100 struct ib_mad_list_head *mad_list;
2101 struct ib_mad_qp_info *qp_info;
2102 struct ib_mad_queue *send_queue;
2103 struct ib_send_wr *bad_send_wr;
2104 struct ib_mad_send_wc mad_send_wc;
2105 unsigned long flags;
2106 int ret;
2107
2108 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2109 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2110 mad_list);
2111 send_queue = mad_list->mad_queue;
2112 qp_info = send_queue->qp_info;
2113
2114 retry:
2115 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2116 mad_send_wr->header_mapping,
2117 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2118 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2119 mad_send_wr->payload_mapping,
2120 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2121 queued_send_wr = NULL;
2122 spin_lock_irqsave(&send_queue->lock, flags);
2123 list_del(&mad_list->list);
2124
2125 /* Move queued send to the send queue */
2126 if (send_queue->count-- > send_queue->max_active) {
2127 mad_list = container_of(qp_info->overflow_list.next,
2128 struct ib_mad_list_head, list);
2129 queued_send_wr = container_of(mad_list,
2130 struct ib_mad_send_wr_private,
2131 mad_list);
2132 list_move_tail(&mad_list->list, &send_queue->list);
2133 }
2134 spin_unlock_irqrestore(&send_queue->lock, flags);
2135
2136 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2137 mad_send_wc.status = wc->status;
2138 mad_send_wc.vendor_err = wc->vendor_err;
2139 if (atomic_read(&qp_info->snoop_count))
2140 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2141 IB_MAD_SNOOP_SEND_COMPLETIONS);
2142 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2143
2144 if (queued_send_wr) {
2145 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2146 &bad_send_wr);
2147 if (ret) {
2148 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2149 mad_send_wr = queued_send_wr;
2150 wc->status = IB_WC_LOC_QP_OP_ERR;
2151 goto retry;
2152 }
2153 }
2154 }
2155
2156 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2157 {
2158 struct ib_mad_send_wr_private *mad_send_wr;
2159 struct ib_mad_list_head *mad_list;
2160 unsigned long flags;
2161
2162 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2163 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2164 mad_send_wr = container_of(mad_list,
2165 struct ib_mad_send_wr_private,
2166 mad_list);
2167 mad_send_wr->retry = 1;
2168 }
2169 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2170 }
2171
2172 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2173 struct ib_wc *wc)
2174 {
2175 struct ib_mad_list_head *mad_list;
2176 struct ib_mad_qp_info *qp_info;
2177 struct ib_mad_send_wr_private *mad_send_wr;
2178 int ret;
2179
2180 /* Determine if failure was a send or receive */
2181 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2182 qp_info = mad_list->mad_queue->qp_info;
2183 if (mad_list->mad_queue == &qp_info->recv_queue)
2184 /*
2185 * Receive errors indicate that the QP has entered the error
2186 * state - error handling/shutdown code will cleanup
2187 */
2188 return;
2189
2190 /*
2191 * Send errors will transition the QP to SQE - move
2192 * QP to RTS and repost flushed work requests
2193 */
2194 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2195 mad_list);
2196 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2197 if (mad_send_wr->retry) {
2198 /* Repost send */
2199 struct ib_send_wr *bad_send_wr;
2200
2201 mad_send_wr->retry = 0;
2202 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2203 &bad_send_wr);
2204 if (ret)
2205 ib_mad_send_done_handler(port_priv, wc);
2206 } else
2207 ib_mad_send_done_handler(port_priv, wc);
2208 } else {
2209 struct ib_qp_attr *attr;
2210
2211 /* Transition QP to RTS and fail offending send */
2212 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2213 if (attr) {
2214 attr->qp_state = IB_QPS_RTS;
2215 attr->cur_qp_state = IB_QPS_SQE;
2216 ret = ib_modify_qp(qp_info->qp, attr,
2217 IB_QP_STATE | IB_QP_CUR_STATE);
2218 kfree(attr);
2219 if (ret)
2220 printk(KERN_ERR PFX "mad_error_handler - "
2221 "ib_modify_qp to RTS : %d\n", ret);
2222 else
2223 mark_sends_for_retry(qp_info);
2224 }
2225 ib_mad_send_done_handler(port_priv, wc);
2226 }
2227 }
2228
2229 /*
2230 * IB MAD completion callback
2231 */
2232 static void ib_mad_completion_handler(struct work_struct *work)
2233 {
2234 struct ib_mad_port_private *port_priv;
2235 struct ib_wc wc;
2236
2237 port_priv = container_of(work, struct ib_mad_port_private, work);
2238 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2239
2240 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2241 if (wc.status == IB_WC_SUCCESS) {
2242 switch (wc.opcode) {
2243 case IB_WC_SEND:
2244 ib_mad_send_done_handler(port_priv, &wc);
2245 break;
2246 case IB_WC_RECV:
2247 ib_mad_recv_done_handler(port_priv, &wc);
2248 break;
2249 default:
2250 BUG_ON(1);
2251 break;
2252 }
2253 } else
2254 mad_error_handler(port_priv, &wc);
2255 }
2256 }
2257
2258 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2259 {
2260 unsigned long flags;
2261 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2262 struct ib_mad_send_wc mad_send_wc;
2263 struct list_head cancel_list;
2264
2265 INIT_LIST_HEAD(&cancel_list);
2266
2267 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2268 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2269 &mad_agent_priv->send_list, agent_list) {
2270 if (mad_send_wr->status == IB_WC_SUCCESS) {
2271 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2272 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2273 }
2274 }
2275
2276 /* Empty wait list to prevent receives from finding a request */
2277 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2278 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2279
2280 /* Report all cancelled requests */
2281 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2282 mad_send_wc.vendor_err = 0;
2283
2284 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2285 &cancel_list, agent_list) {
2286 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2287 list_del(&mad_send_wr->agent_list);
2288 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2289 &mad_send_wc);
2290 atomic_dec(&mad_agent_priv->refcount);
2291 }
2292 }
2293
2294 static struct ib_mad_send_wr_private*
2295 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2296 struct ib_mad_send_buf *send_buf)
2297 {
2298 struct ib_mad_send_wr_private *mad_send_wr;
2299
2300 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2301 agent_list) {
2302 if (&mad_send_wr->send_buf == send_buf)
2303 return mad_send_wr;
2304 }
2305
2306 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2307 agent_list) {
2308 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2309 &mad_send_wr->send_buf == send_buf)
2310 return mad_send_wr;
2311 }
2312 return NULL;
2313 }
2314
2315 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2316 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2317 {
2318 struct ib_mad_agent_private *mad_agent_priv;
2319 struct ib_mad_send_wr_private *mad_send_wr;
2320 unsigned long flags;
2321 int active;
2322
2323 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2324 agent);
2325 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2326 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2327 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2328 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2329 return -EINVAL;
2330 }
2331
2332 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2333 if (!timeout_ms) {
2334 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2335 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2336 }
2337
2338 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2339 if (active)
2340 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2341 else
2342 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2343
2344 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2345 return 0;
2346 }
2347 EXPORT_SYMBOL(ib_modify_mad);
2348
2349 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2350 struct ib_mad_send_buf *send_buf)
2351 {
2352 ib_modify_mad(mad_agent, send_buf, 0);
2353 }
2354 EXPORT_SYMBOL(ib_cancel_mad);
2355
2356 static void local_completions(struct work_struct *work)
2357 {
2358 struct ib_mad_agent_private *mad_agent_priv;
2359 struct ib_mad_local_private *local;
2360 struct ib_mad_agent_private *recv_mad_agent;
2361 unsigned long flags;
2362 int free_mad;
2363 struct ib_wc wc;
2364 struct ib_mad_send_wc mad_send_wc;
2365
2366 mad_agent_priv =
2367 container_of(work, struct ib_mad_agent_private, local_work);
2368
2369 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2370 while (!list_empty(&mad_agent_priv->local_list)) {
2371 local = list_entry(mad_agent_priv->local_list.next,
2372 struct ib_mad_local_private,
2373 completion_list);
2374 list_del(&local->completion_list);
2375 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2376 free_mad = 0;
2377 if (local->mad_priv) {
2378 recv_mad_agent = local->recv_mad_agent;
2379 if (!recv_mad_agent) {
2380 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2381 free_mad = 1;
2382 goto local_send_completion;
2383 }
2384
2385 /*
2386 * Defined behavior is to complete response
2387 * before request
2388 */
2389 build_smp_wc(recv_mad_agent->agent.qp,
2390 (unsigned long) local->mad_send_wr,
2391 be16_to_cpu(IB_LID_PERMISSIVE),
2392 0, recv_mad_agent->agent.port_num, &wc);
2393
2394 local->mad_priv->header.recv_wc.wc = &wc;
2395 local->mad_priv->header.recv_wc.mad_len =
2396 sizeof(struct ib_mad);
2397 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2398 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2399 &local->mad_priv->header.recv_wc.rmpp_list);
2400 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2401 local->mad_priv->header.recv_wc.recv_buf.mad =
2402 &local->mad_priv->mad.mad;
2403 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2404 snoop_recv(recv_mad_agent->qp_info,
2405 &local->mad_priv->header.recv_wc,
2406 IB_MAD_SNOOP_RECVS);
2407 recv_mad_agent->agent.recv_handler(
2408 &recv_mad_agent->agent,
2409 &local->mad_priv->header.recv_wc);
2410 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2411 atomic_dec(&recv_mad_agent->refcount);
2412 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2413 }
2414
2415 local_send_completion:
2416 /* Complete send */
2417 mad_send_wc.status = IB_WC_SUCCESS;
2418 mad_send_wc.vendor_err = 0;
2419 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2420 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2421 snoop_send(mad_agent_priv->qp_info,
2422 &local->mad_send_wr->send_buf,
2423 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2424 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2425 &mad_send_wc);
2426
2427 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2428 atomic_dec(&mad_agent_priv->refcount);
2429 if (free_mad)
2430 kmem_cache_free(ib_mad_cache, local->mad_priv);
2431 kfree(local);
2432 }
2433 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2434 }
2435
2436 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2437 {
2438 int ret;
2439
2440 if (!mad_send_wr->retries_left)
2441 return -ETIMEDOUT;
2442
2443 mad_send_wr->retries_left--;
2444 mad_send_wr->send_buf.retries++;
2445
2446 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2447
2448 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2449 ret = ib_retry_rmpp(mad_send_wr);
2450 switch (ret) {
2451 case IB_RMPP_RESULT_UNHANDLED:
2452 ret = ib_send_mad(mad_send_wr);
2453 break;
2454 case IB_RMPP_RESULT_CONSUMED:
2455 ret = 0;
2456 break;
2457 default:
2458 ret = -ECOMM;
2459 break;
2460 }
2461 } else
2462 ret = ib_send_mad(mad_send_wr);
2463
2464 if (!ret) {
2465 mad_send_wr->refcount++;
2466 list_add_tail(&mad_send_wr->agent_list,
2467 &mad_send_wr->mad_agent_priv->send_list);
2468 }
2469 return ret;
2470 }
2471
2472 static void timeout_sends(struct work_struct *work)
2473 {
2474 struct ib_mad_agent_private *mad_agent_priv;
2475 struct ib_mad_send_wr_private *mad_send_wr;
2476 struct ib_mad_send_wc mad_send_wc;
2477 unsigned long flags, delay;
2478
2479 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2480 timed_work.work);
2481 mad_send_wc.vendor_err = 0;
2482
2483 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2484 while (!list_empty(&mad_agent_priv->wait_list)) {
2485 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2486 struct ib_mad_send_wr_private,
2487 agent_list);
2488
2489 if (time_after(mad_send_wr->timeout, jiffies)) {
2490 delay = mad_send_wr->timeout - jiffies;
2491 if ((long)delay <= 0)
2492 delay = 1;
2493 queue_delayed_work(mad_agent_priv->qp_info->
2494 port_priv->wq,
2495 &mad_agent_priv->timed_work, delay);
2496 break;
2497 }
2498
2499 list_del(&mad_send_wr->agent_list);
2500 if (mad_send_wr->status == IB_WC_SUCCESS &&
2501 !retry_send(mad_send_wr))
2502 continue;
2503
2504 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2505
2506 if (mad_send_wr->status == IB_WC_SUCCESS)
2507 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2508 else
2509 mad_send_wc.status = mad_send_wr->status;
2510 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2511 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2512 &mad_send_wc);
2513
2514 atomic_dec(&mad_agent_priv->refcount);
2515 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2516 }
2517 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2518 }
2519
2520 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2521 {
2522 struct ib_mad_port_private *port_priv = cq->cq_context;
2523 unsigned long flags;
2524
2525 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2526 if (!list_empty(&port_priv->port_list))
2527 queue_work(port_priv->wq, &port_priv->work);
2528 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2529 }
2530
2531 /*
2532 * Allocate receive MADs and post receive WRs for them
2533 */
2534 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2535 struct ib_mad_private *mad)
2536 {
2537 unsigned long flags;
2538 int post, ret;
2539 struct ib_mad_private *mad_priv;
2540 struct ib_sge sg_list;
2541 struct ib_recv_wr recv_wr, *bad_recv_wr;
2542 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2543
2544 /* Initialize common scatter list fields */
2545 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2546 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2547
2548 /* Initialize common receive WR fields */
2549 recv_wr.next = NULL;
2550 recv_wr.sg_list = &sg_list;
2551 recv_wr.num_sge = 1;
2552
2553 do {
2554 /* Allocate and map receive buffer */
2555 if (mad) {
2556 mad_priv = mad;
2557 mad = NULL;
2558 } else {
2559 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2560 if (!mad_priv) {
2561 printk(KERN_ERR PFX "No memory for receive buffer\n");
2562 ret = -ENOMEM;
2563 break;
2564 }
2565 }
2566 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2567 &mad_priv->grh,
2568 sizeof *mad_priv -
2569 sizeof mad_priv->header,
2570 DMA_FROM_DEVICE);
2571 mad_priv->header.mapping = sg_list.addr;
2572 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2573 mad_priv->header.mad_list.mad_queue = recv_queue;
2574
2575 /* Post receive WR */
2576 spin_lock_irqsave(&recv_queue->lock, flags);
2577 post = (++recv_queue->count < recv_queue->max_active);
2578 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2579 spin_unlock_irqrestore(&recv_queue->lock, flags);
2580 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2581 if (ret) {
2582 spin_lock_irqsave(&recv_queue->lock, flags);
2583 list_del(&mad_priv->header.mad_list.list);
2584 recv_queue->count--;
2585 spin_unlock_irqrestore(&recv_queue->lock, flags);
2586 ib_dma_unmap_single(qp_info->port_priv->device,
2587 mad_priv->header.mapping,
2588 sizeof *mad_priv -
2589 sizeof mad_priv->header,
2590 DMA_FROM_DEVICE);
2591 kmem_cache_free(ib_mad_cache, mad_priv);
2592 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2593 break;
2594 }
2595 } while (post);
2596
2597 return ret;
2598 }
2599
2600 /*
2601 * Return all the posted receive MADs
2602 */
2603 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2604 {
2605 struct ib_mad_private_header *mad_priv_hdr;
2606 struct ib_mad_private *recv;
2607 struct ib_mad_list_head *mad_list;
2608
2609 if (!qp_info->qp)
2610 return;
2611
2612 while (!list_empty(&qp_info->recv_queue.list)) {
2613
2614 mad_list = list_entry(qp_info->recv_queue.list.next,
2615 struct ib_mad_list_head, list);
2616 mad_priv_hdr = container_of(mad_list,
2617 struct ib_mad_private_header,
2618 mad_list);
2619 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2620 header);
2621
2622 /* Remove from posted receive MAD list */
2623 list_del(&mad_list->list);
2624
2625 ib_dma_unmap_single(qp_info->port_priv->device,
2626 recv->header.mapping,
2627 sizeof(struct ib_mad_private) -
2628 sizeof(struct ib_mad_private_header),
2629 DMA_FROM_DEVICE);
2630 kmem_cache_free(ib_mad_cache, recv);
2631 }
2632
2633 qp_info->recv_queue.count = 0;
2634 }
2635
2636 /*
2637 * Start the port
2638 */
2639 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2640 {
2641 int ret, i;
2642 struct ib_qp_attr *attr;
2643 struct ib_qp *qp;
2644
2645 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2646 if (!attr) {
2647 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2648 return -ENOMEM;
2649 }
2650
2651 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2652 qp = port_priv->qp_info[i].qp;
2653 if (!qp)
2654 continue;
2655
2656 /*
2657 * PKey index for QP1 is irrelevant but
2658 * one is needed for the Reset to Init transition
2659 */
2660 attr->qp_state = IB_QPS_INIT;
2661 attr->pkey_index = 0;
2662 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2663 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2664 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2665 if (ret) {
2666 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2667 "INIT: %d\n", i, ret);
2668 goto out;
2669 }
2670
2671 attr->qp_state = IB_QPS_RTR;
2672 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2673 if (ret) {
2674 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2675 "RTR: %d\n", i, ret);
2676 goto out;
2677 }
2678
2679 attr->qp_state = IB_QPS_RTS;
2680 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2681 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2682 if (ret) {
2683 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2684 "RTS: %d\n", i, ret);
2685 goto out;
2686 }
2687 }
2688
2689 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2690 if (ret) {
2691 printk(KERN_ERR PFX "Failed to request completion "
2692 "notification: %d\n", ret);
2693 goto out;
2694 }
2695
2696 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2697 if (!port_priv->qp_info[i].qp)
2698 continue;
2699
2700 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2701 if (ret) {
2702 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2703 goto out;
2704 }
2705 }
2706 out:
2707 kfree(attr);
2708 return ret;
2709 }
2710
2711 static void qp_event_handler(struct ib_event *event, void *qp_context)
2712 {
2713 struct ib_mad_qp_info *qp_info = qp_context;
2714
2715 /* It's worse than that! He's dead, Jim! */
2716 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2717 event->event, qp_info->qp->qp_num);
2718 }
2719
2720 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2721 struct ib_mad_queue *mad_queue)
2722 {
2723 mad_queue->qp_info = qp_info;
2724 mad_queue->count = 0;
2725 spin_lock_init(&mad_queue->lock);
2726 INIT_LIST_HEAD(&mad_queue->list);
2727 }
2728
2729 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2730 struct ib_mad_qp_info *qp_info)
2731 {
2732 qp_info->port_priv = port_priv;
2733 init_mad_queue(qp_info, &qp_info->send_queue);
2734 init_mad_queue(qp_info, &qp_info->recv_queue);
2735 INIT_LIST_HEAD(&qp_info->overflow_list);
2736 spin_lock_init(&qp_info->snoop_lock);
2737 qp_info->snoop_table = NULL;
2738 qp_info->snoop_table_size = 0;
2739 atomic_set(&qp_info->snoop_count, 0);
2740 }
2741
2742 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2743 enum ib_qp_type qp_type)
2744 {
2745 struct ib_qp_init_attr qp_init_attr;
2746 int ret;
2747
2748 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2749 qp_init_attr.send_cq = qp_info->port_priv->cq;
2750 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2751 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2752 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2753 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2754 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2755 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2756 qp_init_attr.qp_type = qp_type;
2757 qp_init_attr.port_num = qp_info->port_priv->port_num;
2758 qp_init_attr.qp_context = qp_info;
2759 qp_init_attr.event_handler = qp_event_handler;
2760 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2761 if (IS_ERR(qp_info->qp)) {
2762 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2763 get_spl_qp_index(qp_type));
2764 ret = PTR_ERR(qp_info->qp);
2765 goto error;
2766 }
2767 /* Use minimum queue sizes unless the CQ is resized */
2768 qp_info->send_queue.max_active = mad_sendq_size;
2769 qp_info->recv_queue.max_active = mad_recvq_size;
2770 return 0;
2771
2772 error:
2773 return ret;
2774 }
2775
2776 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2777 {
2778 if (!qp_info->qp)
2779 return;
2780
2781 ib_destroy_qp(qp_info->qp);
2782 kfree(qp_info->snoop_table);
2783 }
2784
2785 /*
2786 * Open the port
2787 * Create the QP, PD, MR, and CQ if needed
2788 */
2789 static int ib_mad_port_open(struct ib_device *device,
2790 int port_num)
2791 {
2792 int ret, cq_size;
2793 struct ib_mad_port_private *port_priv;
2794 unsigned long flags;
2795 char name[sizeof "ib_mad123"];
2796 int has_smi;
2797
2798 /* Create new device info */
2799 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2800 if (!port_priv) {
2801 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2802 return -ENOMEM;
2803 }
2804
2805 port_priv->device = device;
2806 port_priv->port_num = port_num;
2807 spin_lock_init(&port_priv->reg_lock);
2808 INIT_LIST_HEAD(&port_priv->agent_list);
2809 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2810 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2811
2812 cq_size = mad_sendq_size + mad_recvq_size;
2813 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2814 if (has_smi)
2815 cq_size *= 2;
2816
2817 port_priv->cq = ib_create_cq(port_priv->device,
2818 ib_mad_thread_completion_handler,
2819 NULL, port_priv, cq_size, 0);
2820 if (IS_ERR(port_priv->cq)) {
2821 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2822 ret = PTR_ERR(port_priv->cq);
2823 goto error3;
2824 }
2825
2826 port_priv->pd = ib_alloc_pd(device);
2827 if (IS_ERR(port_priv->pd)) {
2828 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2829 ret = PTR_ERR(port_priv->pd);
2830 goto error4;
2831 }
2832
2833 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2834 if (IS_ERR(port_priv->mr)) {
2835 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2836 ret = PTR_ERR(port_priv->mr);
2837 goto error5;
2838 }
2839
2840 if (has_smi) {
2841 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2842 if (ret)
2843 goto error6;
2844 }
2845 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2846 if (ret)
2847 goto error7;
2848
2849 snprintf(name, sizeof name, "ib_mad%d", port_num);
2850 port_priv->wq = create_singlethread_workqueue(name);
2851 if (!port_priv->wq) {
2852 ret = -ENOMEM;
2853 goto error8;
2854 }
2855 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2856
2857 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2858 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2859 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2860
2861 ret = ib_mad_port_start(port_priv);
2862 if (ret) {
2863 printk(KERN_ERR PFX "Couldn't start port\n");
2864 goto error9;
2865 }
2866
2867 return 0;
2868
2869 error9:
2870 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2871 list_del_init(&port_priv->port_list);
2872 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2873
2874 destroy_workqueue(port_priv->wq);
2875 error8:
2876 destroy_mad_qp(&port_priv->qp_info[1]);
2877 error7:
2878 destroy_mad_qp(&port_priv->qp_info[0]);
2879 error6:
2880 ib_dereg_mr(port_priv->mr);
2881 error5:
2882 ib_dealloc_pd(port_priv->pd);
2883 error4:
2884 ib_destroy_cq(port_priv->cq);
2885 cleanup_recv_queue(&port_priv->qp_info[1]);
2886 cleanup_recv_queue(&port_priv->qp_info[0]);
2887 error3:
2888 kfree(port_priv);
2889
2890 return ret;
2891 }
2892
2893 /*
2894 * Close the port
2895 * If there are no classes using the port, free the port
2896 * resources (CQ, MR, PD, QP) and remove the port's info structure
2897 */
2898 static int ib_mad_port_close(struct ib_device *device, int port_num)
2899 {
2900 struct ib_mad_port_private *port_priv;
2901 unsigned long flags;
2902
2903 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2904 port_priv = __ib_get_mad_port(device, port_num);
2905 if (port_priv == NULL) {
2906 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2907 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2908 return -ENODEV;
2909 }
2910 list_del_init(&port_priv->port_list);
2911 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2912
2913 destroy_workqueue(port_priv->wq);
2914 destroy_mad_qp(&port_priv->qp_info[1]);
2915 destroy_mad_qp(&port_priv->qp_info[0]);
2916 ib_dereg_mr(port_priv->mr);
2917 ib_dealloc_pd(port_priv->pd);
2918 ib_destroy_cq(port_priv->cq);
2919 cleanup_recv_queue(&port_priv->qp_info[1]);
2920 cleanup_recv_queue(&port_priv->qp_info[0]);
2921 /* XXX: Handle deallocation of MAD registration tables */
2922
2923 kfree(port_priv);
2924
2925 return 0;
2926 }
2927
2928 static void ib_mad_init_device(struct ib_device *device)
2929 {
2930 int start, end, i;
2931
2932 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2933 return;
2934
2935 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2936 start = 0;
2937 end = 0;
2938 } else {
2939 start = 1;
2940 end = device->phys_port_cnt;
2941 }
2942
2943 for (i = start; i <= end; i++) {
2944 if (ib_mad_port_open(device, i)) {
2945 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2946 device->name, i);
2947 goto error;
2948 }
2949 if (ib_agent_port_open(device, i)) {
2950 printk(KERN_ERR PFX "Couldn't open %s port %d "
2951 "for agents\n",
2952 device->name, i);
2953 goto error_agent;
2954 }
2955 }
2956 return;
2957
2958 error_agent:
2959 if (ib_mad_port_close(device, i))
2960 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2961 device->name, i);
2962
2963 error:
2964 i--;
2965
2966 while (i >= start) {
2967 if (ib_agent_port_close(device, i))
2968 printk(KERN_ERR PFX "Couldn't close %s port %d "
2969 "for agents\n",
2970 device->name, i);
2971 if (ib_mad_port_close(device, i))
2972 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2973 device->name, i);
2974 i--;
2975 }
2976 }
2977
2978 static void ib_mad_remove_device(struct ib_device *device)
2979 {
2980 int i, num_ports, cur_port;
2981
2982 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2983 return;
2984
2985 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2986 num_ports = 1;
2987 cur_port = 0;
2988 } else {
2989 num_ports = device->phys_port_cnt;
2990 cur_port = 1;
2991 }
2992 for (i = 0; i < num_ports; i++, cur_port++) {
2993 if (ib_agent_port_close(device, cur_port))
2994 printk(KERN_ERR PFX "Couldn't close %s port %d "
2995 "for agents\n",
2996 device->name, cur_port);
2997 if (ib_mad_port_close(device, cur_port))
2998 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2999 device->name, cur_port);
3000 }
3001 }
3002
3003 static struct ib_client mad_client = {
3004 .name = "mad",
3005 .add = ib_mad_init_device,
3006 .remove = ib_mad_remove_device
3007 };
3008
3009 static int __init ib_mad_init_module(void)
3010 {
3011 int ret;
3012
3013 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3014 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3015
3016 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3017 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3018
3019 ib_mad_cache = kmem_cache_create("ib_mad",
3020 sizeof(struct ib_mad_private),
3021 0,
3022 SLAB_HWCACHE_ALIGN,
3023 NULL);
3024 if (!ib_mad_cache) {
3025 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3026 ret = -ENOMEM;
3027 goto error1;
3028 }
3029
3030 INIT_LIST_HEAD(&ib_mad_port_list);
3031
3032 if (ib_register_client(&mad_client)) {
3033 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3034 ret = -EINVAL;
3035 goto error2;
3036 }
3037
3038 return 0;
3039
3040 error2:
3041 kmem_cache_destroy(ib_mad_cache);
3042 error1:
3043 return ret;
3044 }
3045
3046 static void __exit ib_mad_cleanup_module(void)
3047 {
3048 ib_unregister_client(&mad_client);
3049 kmem_cache_destroy(ib_mad_cache);
3050 }
3051
3052 module_init(ib_mad_init_module);
3053 module_exit(ib_mad_cleanup_module);
linux-next