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NET: llc, zero sockaddr_llc struct
[linux-2.6/mini2440.git] / drivers / infiniband / core / mad.c
blobde922a04ca2dbd5ca4f8696410750735bdaee681
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 */
35 #include <linux/dma-mapping.h>
36 #include <rdma/ib_cache.h>
37
38 #include "mad_priv.h"
39 #include "mad_rmpp.h"
40 #include "smi.h"
41 #include "agent.h"
42
43 MODULE_LICENSE("Dual BSD/GPL");
44 MODULE_DESCRIPTION("kernel IB MAD API");
45 MODULE_AUTHOR("Hal Rosenstock");
46 MODULE_AUTHOR("Sean Hefty");
47
48 static struct kmem_cache *ib_mad_cache;
49
50 static struct list_head ib_mad_port_list;
51 static u32 ib_mad_client_id = 0;
52
53 /* Port list lock */
54 static spinlock_t ib_mad_port_list_lock;
55
56
57 /* Forward declarations */
58 static int method_in_use(struct ib_mad_mgmt_method_table **method,
59 struct ib_mad_reg_req *mad_reg_req);
60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
61 static struct ib_mad_agent_private *find_mad_agent(
62 struct ib_mad_port_private *port_priv,
63 struct ib_mad *mad);
64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
65 struct ib_mad_private *mad);
66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
67 static void timeout_sends(struct work_struct *work);
68 static void local_completions(struct work_struct *work);
69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
70 struct ib_mad_agent_private *agent_priv,
71 u8 mgmt_class);
72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
73 struct ib_mad_agent_private *agent_priv);
74
75 /*
76 * Returns a ib_mad_port_private structure or NULL for a device/port
77 * Assumes ib_mad_port_list_lock is being held
78 */
79 static inline struct ib_mad_port_private *
80 __ib_get_mad_port(struct ib_device *device, int port_num)
81 {
82 struct ib_mad_port_private *entry;
83
84 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
85 if (entry->device == device && entry->port_num == port_num)
86 return entry;
87 }
88 return NULL;
89 }
90
91 /*
92 * Wrapper function to return a ib_mad_port_private structure or NULL
93 * for a device/port
94 */
95 static inline struct ib_mad_port_private *
96 ib_get_mad_port(struct ib_device *device, int port_num)
97 {
98 struct ib_mad_port_private *entry;
99 unsigned long flags;
100
101 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
102 entry = __ib_get_mad_port(device, port_num);
103 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
104
105 return entry;
106 }
107
108 static inline u8 convert_mgmt_class(u8 mgmt_class)
109 {
110 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
111 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
112 0 : mgmt_class;
113 }
114
115 static int get_spl_qp_index(enum ib_qp_type qp_type)
116 {
117 switch (qp_type)
118 {
119 case IB_QPT_SMI:
120 return 0;
121 case IB_QPT_GSI:
122 return 1;
123 default:
124 return -1;
125 }
126 }
127
128 static int vendor_class_index(u8 mgmt_class)
129 {
130 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
131 }
132
133 static int is_vendor_class(u8 mgmt_class)
134 {
135 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
136 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
137 return 0;
138 return 1;
139 }
140
141 static int is_vendor_oui(char *oui)
142 {
143 if (oui[0] || oui[1] || oui[2])
144 return 1;
145 return 0;
146 }
147
148 static int is_vendor_method_in_use(
149 struct ib_mad_mgmt_vendor_class *vendor_class,
150 struct ib_mad_reg_req *mad_reg_req)
151 {
152 struct ib_mad_mgmt_method_table *method;
153 int i;
154
155 for (i = 0; i < MAX_MGMT_OUI; i++) {
156 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
157 method = vendor_class->method_table[i];
158 if (method) {
159 if (method_in_use(&method, mad_reg_req))
160 return 1;
161 else
162 break;
163 }
164 }
165 }
166 return 0;
167 }
168
169 int ib_response_mad(struct ib_mad *mad)
170 {
171 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
172 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
173 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
174 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
175 }
176 EXPORT_SYMBOL(ib_response_mad);
177
178 /*
179 * ib_register_mad_agent - Register to send/receive MADs
180 */
181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
182 u8 port_num,
183 enum ib_qp_type qp_type,
184 struct ib_mad_reg_req *mad_reg_req,
185 u8 rmpp_version,
186 ib_mad_send_handler send_handler,
187 ib_mad_recv_handler recv_handler,
188 void *context)
189 {
190 struct ib_mad_port_private *port_priv;
191 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
192 struct ib_mad_agent_private *mad_agent_priv;
193 struct ib_mad_reg_req *reg_req = NULL;
194 struct ib_mad_mgmt_class_table *class;
195 struct ib_mad_mgmt_vendor_class_table *vendor;
196 struct ib_mad_mgmt_vendor_class *vendor_class;
197 struct ib_mad_mgmt_method_table *method;
198 int ret2, qpn;
199 unsigned long flags;
200 u8 mgmt_class, vclass;
201
202 /* Validate parameters */
203 qpn = get_spl_qp_index(qp_type);
204 if (qpn == -1)
205 goto error1;
206
207 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
208 goto error1;
209
210 /* Validate MAD registration request if supplied */
211 if (mad_reg_req) {
212 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
213 goto error1;
214 if (!recv_handler)
215 goto error1;
216 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
217 /*
218 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
219 * one in this range currently allowed
220 */
221 if (mad_reg_req->mgmt_class !=
222 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
223 goto error1;
224 } else if (mad_reg_req->mgmt_class == 0) {
225 /*
226 * Class 0 is reserved in IBA and is used for
227 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
228 */
229 goto error1;
230 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
231 /*
232 * If class is in "new" vendor range,
233 * ensure supplied OUI is not zero
234 */
235 if (!is_vendor_oui(mad_reg_req->oui))
236 goto error1;
237 }
238 /* Make sure class supplied is consistent with RMPP */
239 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
240 if (rmpp_version)
241 goto error1;
242 }
243 /* Make sure class supplied is consistent with QP type */
244 if (qp_type == IB_QPT_SMI) {
245 if ((mad_reg_req->mgmt_class !=
246 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
247 (mad_reg_req->mgmt_class !=
248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
249 goto error1;
250 } else {
251 if ((mad_reg_req->mgmt_class ==
252 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
253 (mad_reg_req->mgmt_class ==
254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
255 goto error1;
256 }
257 } else {
258 /* No registration request supplied */
259 if (!send_handler)
260 goto error1;
261 }
262
263 /* Validate device and port */
264 port_priv = ib_get_mad_port(device, port_num);
265 if (!port_priv) {
266 ret = ERR_PTR(-ENODEV);
267 goto error1;
268 }
269
270 /* Allocate structures */
271 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
272 if (!mad_agent_priv) {
273 ret = ERR_PTR(-ENOMEM);
274 goto error1;
275 }
276
277 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
278 IB_ACCESS_LOCAL_WRITE);
279 if (IS_ERR(mad_agent_priv->agent.mr)) {
280 ret = ERR_PTR(-ENOMEM);
281 goto error2;
282 }
283
284 if (mad_reg_req) {
285 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
286 if (!reg_req) {
287 ret = ERR_PTR(-ENOMEM);
288 goto error3;
289 }
290 /* Make a copy of the MAD registration request */
291 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
292 }
293
294 /* Now, fill in the various structures */
295 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
296 mad_agent_priv->reg_req = reg_req;
297 mad_agent_priv->agent.rmpp_version = rmpp_version;
298 mad_agent_priv->agent.device = device;
299 mad_agent_priv->agent.recv_handler = recv_handler;
300 mad_agent_priv->agent.send_handler = send_handler;
301 mad_agent_priv->agent.context = context;
302 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
303 mad_agent_priv->agent.port_num = port_num;
304 spin_lock_init(&mad_agent_priv->lock);
305 INIT_LIST_HEAD(&mad_agent_priv->send_list);
306 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
307 INIT_LIST_HEAD(&mad_agent_priv->done_list);
308 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
309 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
310 INIT_LIST_HEAD(&mad_agent_priv->local_list);
311 INIT_WORK(&mad_agent_priv->local_work, local_completions);
312 atomic_set(&mad_agent_priv->refcount, 1);
313 init_completion(&mad_agent_priv->comp);
314
315 spin_lock_irqsave(&port_priv->reg_lock, flags);
316 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
317
318 /*
319 * Make sure MAD registration (if supplied)
320 * is non overlapping with any existing ones
321 */
322 if (mad_reg_req) {
323 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
324 if (!is_vendor_class(mgmt_class)) {
325 class = port_priv->version[mad_reg_req->
326 mgmt_class_version].class;
327 if (class) {
328 method = class->method_table[mgmt_class];
329 if (method) {
330 if (method_in_use(&method,
331 mad_reg_req))
332 goto error4;
333 }
334 }
335 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
336 mgmt_class);
337 } else {
338 /* "New" vendor class range */
339 vendor = port_priv->version[mad_reg_req->
340 mgmt_class_version].vendor;
341 if (vendor) {
342 vclass = vendor_class_index(mgmt_class);
343 vendor_class = vendor->vendor_class[vclass];
344 if (vendor_class) {
345 if (is_vendor_method_in_use(
346 vendor_class,
347 mad_reg_req))
348 goto error4;
349 }
350 }
351 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
352 }
353 if (ret2) {
354 ret = ERR_PTR(ret2);
355 goto error4;
356 }
357 }
358
359 /* Add mad agent into port's agent list */
360 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
361 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
362
363 return &mad_agent_priv->agent;
364
365 error4:
366 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
367 kfree(reg_req);
368 error3:
369 ib_dereg_mr(mad_agent_priv->agent.mr);
370 error2:
371 kfree(mad_agent_priv);
372 error1:
373 return ret;
374 }
375 EXPORT_SYMBOL(ib_register_mad_agent);
376
377 static inline int is_snooping_sends(int mad_snoop_flags)
378 {
379 return (mad_snoop_flags &
380 (/*IB_MAD_SNOOP_POSTED_SENDS |
381 IB_MAD_SNOOP_RMPP_SENDS |*/
382 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
383 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
384 }
385
386 static inline int is_snooping_recvs(int mad_snoop_flags)
387 {
388 return (mad_snoop_flags &
389 (IB_MAD_SNOOP_RECVS /*|
390 IB_MAD_SNOOP_RMPP_RECVS*/));
391 }
392
393 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
394 struct ib_mad_snoop_private *mad_snoop_priv)
395 {
396 struct ib_mad_snoop_private **new_snoop_table;
397 unsigned long flags;
398 int i;
399
400 spin_lock_irqsave(&qp_info->snoop_lock, flags);
401 /* Check for empty slot in array. */
402 for (i = 0; i < qp_info->snoop_table_size; i++)
403 if (!qp_info->snoop_table[i])
404 break;
405
406 if (i == qp_info->snoop_table_size) {
407 /* Grow table. */
408 new_snoop_table = krealloc(qp_info->snoop_table,
409 sizeof mad_snoop_priv *
410 (qp_info->snoop_table_size + 1),
411 GFP_ATOMIC);
412 if (!new_snoop_table) {
413 i = -ENOMEM;
414 goto out;
415 }
416
417 qp_info->snoop_table = new_snoop_table;
418 qp_info->snoop_table_size++;
419 }
420 qp_info->snoop_table[i] = mad_snoop_priv;
421 atomic_inc(&qp_info->snoop_count);
422 out:
423 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
424 return i;
425 }
426
427 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
428 u8 port_num,
429 enum ib_qp_type qp_type,
430 int mad_snoop_flags,
431 ib_mad_snoop_handler snoop_handler,
432 ib_mad_recv_handler recv_handler,
433 void *context)
434 {
435 struct ib_mad_port_private *port_priv;
436 struct ib_mad_agent *ret;
437 struct ib_mad_snoop_private *mad_snoop_priv;
438 int qpn;
439
440 /* Validate parameters */
441 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
442 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
443 ret = ERR_PTR(-EINVAL);
444 goto error1;
445 }
446 qpn = get_spl_qp_index(qp_type);
447 if (qpn == -1) {
448 ret = ERR_PTR(-EINVAL);
449 goto error1;
450 }
451 port_priv = ib_get_mad_port(device, port_num);
452 if (!port_priv) {
453 ret = ERR_PTR(-ENODEV);
454 goto error1;
455 }
456 /* Allocate structures */
457 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
458 if (!mad_snoop_priv) {
459 ret = ERR_PTR(-ENOMEM);
460 goto error1;
461 }
462
463 /* Now, fill in the various structures */
464 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
465 mad_snoop_priv->agent.device = device;
466 mad_snoop_priv->agent.recv_handler = recv_handler;
467 mad_snoop_priv->agent.snoop_handler = snoop_handler;
468 mad_snoop_priv->agent.context = context;
469 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
470 mad_snoop_priv->agent.port_num = port_num;
471 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
472 init_completion(&mad_snoop_priv->comp);
473 mad_snoop_priv->snoop_index = register_snoop_agent(
474 &port_priv->qp_info[qpn],
475 mad_snoop_priv);
476 if (mad_snoop_priv->snoop_index < 0) {
477 ret = ERR_PTR(mad_snoop_priv->snoop_index);
478 goto error2;
479 }
480
481 atomic_set(&mad_snoop_priv->refcount, 1);
482 return &mad_snoop_priv->agent;
483
484 error2:
485 kfree(mad_snoop_priv);
486 error1:
487 return ret;
488 }
489 EXPORT_SYMBOL(ib_register_mad_snoop);
490
491 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
492 {
493 if (atomic_dec_and_test(&mad_agent_priv->refcount))
494 complete(&mad_agent_priv->comp);
495 }
496
497 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
498 {
499 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
500 complete(&mad_snoop_priv->comp);
501 }
502
503 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
504 {
505 struct ib_mad_port_private *port_priv;
506 unsigned long flags;
507
508 /* Note that we could still be handling received MADs */
509
510 /*
511 * Canceling all sends results in dropping received response
512 * MADs, preventing us from queuing additional work
513 */
514 cancel_mads(mad_agent_priv);
515 port_priv = mad_agent_priv->qp_info->port_priv;
516 cancel_delayed_work(&mad_agent_priv->timed_work);
517
518 spin_lock_irqsave(&port_priv->reg_lock, flags);
519 remove_mad_reg_req(mad_agent_priv);
520 list_del(&mad_agent_priv->agent_list);
521 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
522
523 flush_workqueue(port_priv->wq);
524 ib_cancel_rmpp_recvs(mad_agent_priv);
525
526 deref_mad_agent(mad_agent_priv);
527 wait_for_completion(&mad_agent_priv->comp);
528
529 kfree(mad_agent_priv->reg_req);
530 ib_dereg_mr(mad_agent_priv->agent.mr);
531 kfree(mad_agent_priv);
532 }
533
534 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
535 {
536 struct ib_mad_qp_info *qp_info;
537 unsigned long flags;
538
539 qp_info = mad_snoop_priv->qp_info;
540 spin_lock_irqsave(&qp_info->snoop_lock, flags);
541 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
542 atomic_dec(&qp_info->snoop_count);
543 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
544
545 deref_snoop_agent(mad_snoop_priv);
546 wait_for_completion(&mad_snoop_priv->comp);
547
548 kfree(mad_snoop_priv);
549 }
550
551 /*
552 * ib_unregister_mad_agent - Unregisters a client from using MAD services
553 */
554 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
555 {
556 struct ib_mad_agent_private *mad_agent_priv;
557 struct ib_mad_snoop_private *mad_snoop_priv;
558
559 /* If the TID is zero, the agent can only snoop. */
560 if (mad_agent->hi_tid) {
561 mad_agent_priv = container_of(mad_agent,
562 struct ib_mad_agent_private,
563 agent);
564 unregister_mad_agent(mad_agent_priv);
565 } else {
566 mad_snoop_priv = container_of(mad_agent,
567 struct ib_mad_snoop_private,
568 agent);
569 unregister_mad_snoop(mad_snoop_priv);
570 }
571 return 0;
572 }
573 EXPORT_SYMBOL(ib_unregister_mad_agent);
574
575 static void dequeue_mad(struct ib_mad_list_head *mad_list)
576 {
577 struct ib_mad_queue *mad_queue;
578 unsigned long flags;
579
580 BUG_ON(!mad_list->mad_queue);
581 mad_queue = mad_list->mad_queue;
582 spin_lock_irqsave(&mad_queue->lock, flags);
583 list_del(&mad_list->list);
584 mad_queue->count--;
585 spin_unlock_irqrestore(&mad_queue->lock, flags);
586 }
587
588 static void snoop_send(struct ib_mad_qp_info *qp_info,
589 struct ib_mad_send_buf *send_buf,
590 struct ib_mad_send_wc *mad_send_wc,
591 int mad_snoop_flags)
592 {
593 struct ib_mad_snoop_private *mad_snoop_priv;
594 unsigned long flags;
595 int i;
596
597 spin_lock_irqsave(&qp_info->snoop_lock, flags);
598 for (i = 0; i < qp_info->snoop_table_size; i++) {
599 mad_snoop_priv = qp_info->snoop_table[i];
600 if (!mad_snoop_priv ||
601 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
602 continue;
603
604 atomic_inc(&mad_snoop_priv->refcount);
605 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
606 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
607 send_buf, mad_send_wc);
608 deref_snoop_agent(mad_snoop_priv);
609 spin_lock_irqsave(&qp_info->snoop_lock, flags);
610 }
611 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
612 }
613
614 static void snoop_recv(struct ib_mad_qp_info *qp_info,
615 struct ib_mad_recv_wc *mad_recv_wc,
616 int mad_snoop_flags)
617 {
618 struct ib_mad_snoop_private *mad_snoop_priv;
619 unsigned long flags;
620 int i;
621
622 spin_lock_irqsave(&qp_info->snoop_lock, flags);
623 for (i = 0; i < qp_info->snoop_table_size; i++) {
624 mad_snoop_priv = qp_info->snoop_table[i];
625 if (!mad_snoop_priv ||
626 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
627 continue;
628
629 atomic_inc(&mad_snoop_priv->refcount);
630 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
631 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
632 mad_recv_wc);
633 deref_snoop_agent(mad_snoop_priv);
634 spin_lock_irqsave(&qp_info->snoop_lock, flags);
635 }
636 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
637 }
638
639 static void build_smp_wc(struct ib_qp *qp,
640 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
641 struct ib_wc *wc)
642 {
643 memset(wc, 0, sizeof *wc);
644 wc->wr_id = wr_id;
645 wc->status = IB_WC_SUCCESS;
646 wc->opcode = IB_WC_RECV;
647 wc->pkey_index = pkey_index;
648 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
649 wc->src_qp = IB_QP0;
650 wc->qp = qp;
651 wc->slid = slid;
652 wc->sl = 0;
653 wc->dlid_path_bits = 0;
654 wc->port_num = port_num;
655 }
656
657 /*
658 * Return 0 if SMP is to be sent
659 * Return 1 if SMP was consumed locally (whether or not solicited)
660 * Return < 0 if error
661 */
662 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
663 struct ib_mad_send_wr_private *mad_send_wr)
664 {
665 int ret = 0;
666 struct ib_smp *smp = mad_send_wr->send_buf.mad;
667 unsigned long flags;
668 struct ib_mad_local_private *local;
669 struct ib_mad_private *mad_priv;
670 struct ib_mad_port_private *port_priv;
671 struct ib_mad_agent_private *recv_mad_agent = NULL;
672 struct ib_device *device = mad_agent_priv->agent.device;
673 u8 port_num;
674 struct ib_wc mad_wc;
675 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
676
677 if (device->node_type == RDMA_NODE_IB_SWITCH &&
678 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
679 port_num = send_wr->wr.ud.port_num;
680 else
681 port_num = mad_agent_priv->agent.port_num;
682
683 /*
684 * Directed route handling starts if the initial LID routed part of
685 * a request or the ending LID routed part of a response is empty.
686 * If we are at the start of the LID routed part, don't update the
687 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
688 */
689 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
690 IB_LID_PERMISSIVE &&
691 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
692 IB_SMI_DISCARD) {
693 ret = -EINVAL;
694 printk(KERN_ERR PFX "Invalid directed route\n");
695 goto out;
696 }
697
698 /* Check to post send on QP or process locally */
699 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
700 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
701 goto out;
702
703 local = kmalloc(sizeof *local, GFP_ATOMIC);
704 if (!local) {
705 ret = -ENOMEM;
706 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
707 goto out;
708 }
709 local->mad_priv = NULL;
710 local->recv_mad_agent = NULL;
711 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
712 if (!mad_priv) {
713 ret = -ENOMEM;
714 printk(KERN_ERR PFX "No memory for local response MAD\n");
715 kfree(local);
716 goto out;
717 }
718
719 build_smp_wc(mad_agent_priv->agent.qp,
720 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
721 send_wr->wr.ud.pkey_index,
722 send_wr->wr.ud.port_num, &mad_wc);
723
724 /* No GRH for DR SMP */
725 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
726 (struct ib_mad *)smp,
727 (struct ib_mad *)&mad_priv->mad);
728 switch (ret)
729 {
730 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
731 if (ib_response_mad(&mad_priv->mad.mad) &&
732 mad_agent_priv->agent.recv_handler) {
733 local->mad_priv = mad_priv;
734 local->recv_mad_agent = mad_agent_priv;
735 /*
736 * Reference MAD agent until receive
737 * side of local completion handled
738 */
739 atomic_inc(&mad_agent_priv->refcount);
740 } else
741 kmem_cache_free(ib_mad_cache, mad_priv);
742 break;
743 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
744 kmem_cache_free(ib_mad_cache, mad_priv);
745 break;
746 case IB_MAD_RESULT_SUCCESS:
747 /* Treat like an incoming receive MAD */
748 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
749 mad_agent_priv->agent.port_num);
750 if (port_priv) {
751 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
752 recv_mad_agent = find_mad_agent(port_priv,
753 &mad_priv->mad.mad);
754 }
755 if (!port_priv || !recv_mad_agent) {
756 /*
757 * No receiving agent so drop packet and
758 * generate send completion.
759 */
760 kmem_cache_free(ib_mad_cache, mad_priv);
761 break;
762 }
763 local->mad_priv = mad_priv;
764 local->recv_mad_agent = recv_mad_agent;
765 break;
766 default:
767 kmem_cache_free(ib_mad_cache, mad_priv);
768 kfree(local);
769 ret = -EINVAL;
770 goto out;
771 }
772
773 local->mad_send_wr = mad_send_wr;
774 /* Reference MAD agent until send side of local completion handled */
775 atomic_inc(&mad_agent_priv->refcount);
776 /* Queue local completion to local list */
777 spin_lock_irqsave(&mad_agent_priv->lock, flags);
778 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
779 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
780 queue_work(mad_agent_priv->qp_info->port_priv->wq,
781 &mad_agent_priv->local_work);
782 ret = 1;
783 out:
784 return ret;
785 }
786
787 static int get_pad_size(int hdr_len, int data_len)
788 {
789 int seg_size, pad;
790
791 seg_size = sizeof(struct ib_mad) - hdr_len;
792 if (data_len && seg_size) {
793 pad = seg_size - data_len % seg_size;
794 return pad == seg_size ? 0 : pad;
795 } else
796 return seg_size;
797 }
798
799 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
800 {
801 struct ib_rmpp_segment *s, *t;
802
803 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
804 list_del(&s->list);
805 kfree(s);
806 }
807 }
808
809 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
810 gfp_t gfp_mask)
811 {
812 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
813 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
814 struct ib_rmpp_segment *seg = NULL;
815 int left, seg_size, pad;
816
817 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
818 seg_size = send_buf->seg_size;
819 pad = send_wr->pad;
820
821 /* Allocate data segments. */
822 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
823 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
824 if (!seg) {
825 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
826 "alloc failed for len %zd, gfp %#x\n",
827 sizeof (*seg) + seg_size, gfp_mask);
828 free_send_rmpp_list(send_wr);
829 return -ENOMEM;
830 }
831 seg->num = ++send_buf->seg_count;
832 list_add_tail(&seg->list, &send_wr->rmpp_list);
833 }
834
835 /* Zero any padding */
836 if (pad)
837 memset(seg->data + seg_size - pad, 0, pad);
838
839 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
840 agent.rmpp_version;
841 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
842 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
843
844 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
845 struct ib_rmpp_segment, list);
846 send_wr->last_ack_seg = send_wr->cur_seg;
847 return 0;
848 }
849
850 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
851 u32 remote_qpn, u16 pkey_index,
852 int rmpp_active,
853 int hdr_len, int data_len,
854 gfp_t gfp_mask)
855 {
856 struct ib_mad_agent_private *mad_agent_priv;
857 struct ib_mad_send_wr_private *mad_send_wr;
858 int pad, message_size, ret, size;
859 void *buf;
860
861 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
862 agent);
863 pad = get_pad_size(hdr_len, data_len);
864 message_size = hdr_len + data_len + pad;
865
866 if ((!mad_agent->rmpp_version &&
867 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
868 (!rmpp_active && message_size > sizeof(struct ib_mad)))
869 return ERR_PTR(-EINVAL);
870
871 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
872 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
873 if (!buf)
874 return ERR_PTR(-ENOMEM);
875
876 mad_send_wr = buf + size;
877 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
878 mad_send_wr->send_buf.mad = buf;
879 mad_send_wr->send_buf.hdr_len = hdr_len;
880 mad_send_wr->send_buf.data_len = data_len;
881 mad_send_wr->pad = pad;
882
883 mad_send_wr->mad_agent_priv = mad_agent_priv;
884 mad_send_wr->sg_list[0].length = hdr_len;
885 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
886 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
887 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
888
889 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
890 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
891 mad_send_wr->send_wr.num_sge = 2;
892 mad_send_wr->send_wr.opcode = IB_WR_SEND;
893 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
894 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
895 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
896 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
897
898 if (rmpp_active) {
899 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
900 if (ret) {
901 kfree(buf);
902 return ERR_PTR(ret);
903 }
904 }
905
906 mad_send_wr->send_buf.mad_agent = mad_agent;
907 atomic_inc(&mad_agent_priv->refcount);
908 return &mad_send_wr->send_buf;
909 }
910 EXPORT_SYMBOL(ib_create_send_mad);
911
912 int ib_get_mad_data_offset(u8 mgmt_class)
913 {
914 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
915 return IB_MGMT_SA_HDR;
916 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
917 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
918 (mgmt_class == IB_MGMT_CLASS_BIS))
919 return IB_MGMT_DEVICE_HDR;
920 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
921 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
922 return IB_MGMT_VENDOR_HDR;
923 else
924 return IB_MGMT_MAD_HDR;
925 }
926 EXPORT_SYMBOL(ib_get_mad_data_offset);
927
928 int ib_is_mad_class_rmpp(u8 mgmt_class)
929 {
930 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
931 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
932 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
933 (mgmt_class == IB_MGMT_CLASS_BIS) ||
934 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
935 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
936 return 1;
937 return 0;
938 }
939 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
940
941 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
942 {
943 struct ib_mad_send_wr_private *mad_send_wr;
944 struct list_head *list;
945
946 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
947 send_buf);
948 list = &mad_send_wr->cur_seg->list;
949
950 if (mad_send_wr->cur_seg->num < seg_num) {
951 list_for_each_entry(mad_send_wr->cur_seg, list, list)
952 if (mad_send_wr->cur_seg->num == seg_num)
953 break;
954 } else if (mad_send_wr->cur_seg->num > seg_num) {
955 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
956 if (mad_send_wr->cur_seg->num == seg_num)
957 break;
958 }
959 return mad_send_wr->cur_seg->data;
960 }
961 EXPORT_SYMBOL(ib_get_rmpp_segment);
962
963 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
964 {
965 if (mad_send_wr->send_buf.seg_count)
966 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
967 mad_send_wr->seg_num);
968 else
969 return mad_send_wr->send_buf.mad +
970 mad_send_wr->send_buf.hdr_len;
971 }
972
973 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
974 {
975 struct ib_mad_agent_private *mad_agent_priv;
976 struct ib_mad_send_wr_private *mad_send_wr;
977
978 mad_agent_priv = container_of(send_buf->mad_agent,
979 struct ib_mad_agent_private, agent);
980 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
981 send_buf);
982
983 free_send_rmpp_list(mad_send_wr);
984 kfree(send_buf->mad);
985 deref_mad_agent(mad_agent_priv);
986 }
987 EXPORT_SYMBOL(ib_free_send_mad);
988
989 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
990 {
991 struct ib_mad_qp_info *qp_info;
992 struct list_head *list;
993 struct ib_send_wr *bad_send_wr;
994 struct ib_mad_agent *mad_agent;
995 struct ib_sge *sge;
996 unsigned long flags;
997 int ret;
998
999 /* Set WR ID to find mad_send_wr upon completion */
1000 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1001 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1002 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1003
1004 mad_agent = mad_send_wr->send_buf.mad_agent;
1005 sge = mad_send_wr->sg_list;
1006 sge[0].addr = ib_dma_map_single(mad_agent->device,
1007 mad_send_wr->send_buf.mad,
1008 sge[0].length,
1009 DMA_TO_DEVICE);
1010 mad_send_wr->header_mapping = sge[0].addr;
1011
1012 sge[1].addr = ib_dma_map_single(mad_agent->device,
1013 ib_get_payload(mad_send_wr),
1014 sge[1].length,
1015 DMA_TO_DEVICE);
1016 mad_send_wr->payload_mapping = sge[1].addr;
1017
1018 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1019 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1020 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1021 &bad_send_wr);
1022 list = &qp_info->send_queue.list;
1023 } else {
1024 ret = 0;
1025 list = &qp_info->overflow_list;
1026 }
1027
1028 if (!ret) {
1029 qp_info->send_queue.count++;
1030 list_add_tail(&mad_send_wr->mad_list.list, list);
1031 }
1032 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1033 if (ret) {
1034 ib_dma_unmap_single(mad_agent->device,
1035 mad_send_wr->header_mapping,
1036 sge[0].length, DMA_TO_DEVICE);
1037 ib_dma_unmap_single(mad_agent->device,
1038 mad_send_wr->payload_mapping,
1039 sge[1].length, DMA_TO_DEVICE);
1040 }
1041 return ret;
1042 }
1043
1044 /*
1045 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1046 * with the registered client
1047 */
1048 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1049 struct ib_mad_send_buf **bad_send_buf)
1050 {
1051 struct ib_mad_agent_private *mad_agent_priv;
1052 struct ib_mad_send_buf *next_send_buf;
1053 struct ib_mad_send_wr_private *mad_send_wr;
1054 unsigned long flags;
1055 int ret = -EINVAL;
1056
1057 /* Walk list of send WRs and post each on send list */
1058 for (; send_buf; send_buf = next_send_buf) {
1059
1060 mad_send_wr = container_of(send_buf,
1061 struct ib_mad_send_wr_private,
1062 send_buf);
1063 mad_agent_priv = mad_send_wr->mad_agent_priv;
1064
1065 if (!send_buf->mad_agent->send_handler ||
1066 (send_buf->timeout_ms &&
1067 !send_buf->mad_agent->recv_handler)) {
1068 ret = -EINVAL;
1069 goto error;
1070 }
1071
1072 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1073 if (mad_agent_priv->agent.rmpp_version) {
1074 ret = -EINVAL;
1075 goto error;
1076 }
1077 }
1078
1079 /*
1080 * Save pointer to next work request to post in case the
1081 * current one completes, and the user modifies the work
1082 * request associated with the completion
1083 */
1084 next_send_buf = send_buf->next;
1085 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1086
1087 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1088 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1089 ret = handle_outgoing_dr_smp(mad_agent_priv,
1090 mad_send_wr);
1091 if (ret < 0) /* error */
1092 goto error;
1093 else if (ret == 1) /* locally consumed */
1094 continue;
1095 }
1096
1097 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1098 /* Timeout will be updated after send completes */
1099 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1100 mad_send_wr->max_retries = send_buf->retries;
1101 mad_send_wr->retries_left = send_buf->retries;
1102 send_buf->retries = 0;
1103 /* Reference for work request to QP + response */
1104 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1105 mad_send_wr->status = IB_WC_SUCCESS;
1106
1107 /* Reference MAD agent until send completes */
1108 atomic_inc(&mad_agent_priv->refcount);
1109 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1110 list_add_tail(&mad_send_wr->agent_list,
1111 &mad_agent_priv->send_list);
1112 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1113
1114 if (mad_agent_priv->agent.rmpp_version) {
1115 ret = ib_send_rmpp_mad(mad_send_wr);
1116 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1117 ret = ib_send_mad(mad_send_wr);
1118 } else
1119 ret = ib_send_mad(mad_send_wr);
1120 if (ret < 0) {
1121 /* Fail send request */
1122 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1123 list_del(&mad_send_wr->agent_list);
1124 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1125 atomic_dec(&mad_agent_priv->refcount);
1126 goto error;
1127 }
1128 }
1129 return 0;
1130 error:
1131 if (bad_send_buf)
1132 *bad_send_buf = send_buf;
1133 return ret;
1134 }
1135 EXPORT_SYMBOL(ib_post_send_mad);
1136
1137 /*
1138 * ib_free_recv_mad - Returns data buffers used to receive
1139 * a MAD to the access layer
1140 */
1141 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1142 {
1143 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1144 struct ib_mad_private_header *mad_priv_hdr;
1145 struct ib_mad_private *priv;
1146 struct list_head free_list;
1147
1148 INIT_LIST_HEAD(&free_list);
1149 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1150
1151 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1152 &free_list, list) {
1153 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1154 recv_buf);
1155 mad_priv_hdr = container_of(mad_recv_wc,
1156 struct ib_mad_private_header,
1157 recv_wc);
1158 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1159 header);
1160 kmem_cache_free(ib_mad_cache, priv);
1161 }
1162 }
1163 EXPORT_SYMBOL(ib_free_recv_mad);
1164
1165 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1166 u8 rmpp_version,
1167 ib_mad_send_handler send_handler,
1168 ib_mad_recv_handler recv_handler,
1169 void *context)
1170 {
1171 return ERR_PTR(-EINVAL); /* XXX: for now */
1172 }
1173 EXPORT_SYMBOL(ib_redirect_mad_qp);
1174
1175 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1176 struct ib_wc *wc)
1177 {
1178 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1179 return 0;
1180 }
1181 EXPORT_SYMBOL(ib_process_mad_wc);
1182
1183 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1184 struct ib_mad_reg_req *mad_reg_req)
1185 {
1186 int i;
1187
1188 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1189 i < IB_MGMT_MAX_METHODS;
1190 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1191 1+i)) {
1192 if ((*method)->agent[i]) {
1193 printk(KERN_ERR PFX "Method %d already in use\n", i);
1194 return -EINVAL;
1195 }
1196 }
1197 return 0;
1198 }
1199
1200 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1201 {
1202 /* Allocate management method table */
1203 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1204 if (!*method) {
1205 printk(KERN_ERR PFX "No memory for "
1206 "ib_mad_mgmt_method_table\n");
1207 return -ENOMEM;
1208 }
1209
1210 return 0;
1211 }
1212
1213 /*
1214 * Check to see if there are any methods still in use
1215 */
1216 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1217 {
1218 int i;
1219
1220 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1221 if (method->agent[i])
1222 return 1;
1223 return 0;
1224 }
1225
1226 /*
1227 * Check to see if there are any method tables for this class still in use
1228 */
1229 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1230 {
1231 int i;
1232
1233 for (i = 0; i < MAX_MGMT_CLASS; i++)
1234 if (class->method_table[i])
1235 return 1;
1236 return 0;
1237 }
1238
1239 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1240 {
1241 int i;
1242
1243 for (i = 0; i < MAX_MGMT_OUI; i++)
1244 if (vendor_class->method_table[i])
1245 return 1;
1246 return 0;
1247 }
1248
1249 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1250 char *oui)
1251 {
1252 int i;
1253
1254 for (i = 0; i < MAX_MGMT_OUI; i++)
1255 /* Is there matching OUI for this vendor class ? */
1256 if (!memcmp(vendor_class->oui[i], oui, 3))
1257 return i;
1258
1259 return -1;
1260 }
1261
1262 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1263 {
1264 int i;
1265
1266 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1267 if (vendor->vendor_class[i])
1268 return 1;
1269
1270 return 0;
1271 }
1272
1273 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1274 struct ib_mad_agent_private *agent)
1275 {
1276 int i;
1277
1278 /* Remove any methods for this mad agent */
1279 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1280 if (method->agent[i] == agent) {
1281 method->agent[i] = NULL;
1282 }
1283 }
1284 }
1285
1286 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1287 struct ib_mad_agent_private *agent_priv,
1288 u8 mgmt_class)
1289 {
1290 struct ib_mad_port_private *port_priv;
1291 struct ib_mad_mgmt_class_table **class;
1292 struct ib_mad_mgmt_method_table **method;
1293 int i, ret;
1294
1295 port_priv = agent_priv->qp_info->port_priv;
1296 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1297 if (!*class) {
1298 /* Allocate management class table for "new" class version */
1299 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1300 if (!*class) {
1301 printk(KERN_ERR PFX "No memory for "
1302 "ib_mad_mgmt_class_table\n");
1303 ret = -ENOMEM;
1304 goto error1;
1305 }
1306
1307 /* Allocate method table for this management class */
1308 method = &(*class)->method_table[mgmt_class];
1309 if ((ret = allocate_method_table(method)))
1310 goto error2;
1311 } else {
1312 method = &(*class)->method_table[mgmt_class];
1313 if (!*method) {
1314 /* Allocate method table for this management class */
1315 if ((ret = allocate_method_table(method)))
1316 goto error1;
1317 }
1318 }
1319
1320 /* Now, make sure methods are not already in use */
1321 if (method_in_use(method, mad_reg_req))
1322 goto error3;
1323
1324 /* Finally, add in methods being registered */
1325 for (i = find_first_bit(mad_reg_req->method_mask,
1326 IB_MGMT_MAX_METHODS);
1327 i < IB_MGMT_MAX_METHODS;
1328 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1329 1+i)) {
1330 (*method)->agent[i] = agent_priv;
1331 }
1332 return 0;
1333
1334 error3:
1335 /* Remove any methods for this mad agent */
1336 remove_methods_mad_agent(*method, agent_priv);
1337 /* Now, check to see if there are any methods in use */
1338 if (!check_method_table(*method)) {
1339 /* If not, release management method table */
1340 kfree(*method);
1341 *method = NULL;
1342 }
1343 ret = -EINVAL;
1344 goto error1;
1345 error2:
1346 kfree(*class);
1347 *class = NULL;
1348 error1:
1349 return ret;
1350 }
1351
1352 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1353 struct ib_mad_agent_private *agent_priv)
1354 {
1355 struct ib_mad_port_private *port_priv;
1356 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1357 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1358 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1359 struct ib_mad_mgmt_method_table **method;
1360 int i, ret = -ENOMEM;
1361 u8 vclass;
1362
1363 /* "New" vendor (with OUI) class */
1364 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1365 port_priv = agent_priv->qp_info->port_priv;
1366 vendor_table = &port_priv->version[
1367 mad_reg_req->mgmt_class_version].vendor;
1368 if (!*vendor_table) {
1369 /* Allocate mgmt vendor class table for "new" class version */
1370 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1371 if (!vendor) {
1372 printk(KERN_ERR PFX "No memory for "
1373 "ib_mad_mgmt_vendor_class_table\n");
1374 goto error1;
1375 }
1376
1377 *vendor_table = vendor;
1378 }
1379 if (!(*vendor_table)->vendor_class[vclass]) {
1380 /* Allocate table for this management vendor class */
1381 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1382 if (!vendor_class) {
1383 printk(KERN_ERR PFX "No memory for "
1384 "ib_mad_mgmt_vendor_class\n");
1385 goto error2;
1386 }
1387
1388 (*vendor_table)->vendor_class[vclass] = vendor_class;
1389 }
1390 for (i = 0; i < MAX_MGMT_OUI; i++) {
1391 /* Is there matching OUI for this vendor class ? */
1392 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1393 mad_reg_req->oui, 3)) {
1394 method = &(*vendor_table)->vendor_class[
1395 vclass]->method_table[i];
1396 BUG_ON(!*method);
1397 goto check_in_use;
1398 }
1399 }
1400 for (i = 0; i < MAX_MGMT_OUI; i++) {
1401 /* OUI slot available ? */
1402 if (!is_vendor_oui((*vendor_table)->vendor_class[
1403 vclass]->oui[i])) {
1404 method = &(*vendor_table)->vendor_class[
1405 vclass]->method_table[i];
1406 BUG_ON(*method);
1407 /* Allocate method table for this OUI */
1408 if ((ret = allocate_method_table(method)))
1409 goto error3;
1410 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1411 mad_reg_req->oui, 3);
1412 goto check_in_use;
1413 }
1414 }
1415 printk(KERN_ERR PFX "All OUI slots in use\n");
1416 goto error3;
1417
1418 check_in_use:
1419 /* Now, make sure methods are not already in use */
1420 if (method_in_use(method, mad_reg_req))
1421 goto error4;
1422
1423 /* Finally, add in methods being registered */
1424 for (i = find_first_bit(mad_reg_req->method_mask,
1425 IB_MGMT_MAX_METHODS);
1426 i < IB_MGMT_MAX_METHODS;
1427 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1428 1+i)) {
1429 (*method)->agent[i] = agent_priv;
1430 }
1431 return 0;
1432
1433 error4:
1434 /* Remove any methods for this mad agent */
1435 remove_methods_mad_agent(*method, agent_priv);
1436 /* Now, check to see if there are any methods in use */
1437 if (!check_method_table(*method)) {
1438 /* If not, release management method table */
1439 kfree(*method);
1440 *method = NULL;
1441 }
1442 ret = -EINVAL;
1443 error3:
1444 if (vendor_class) {
1445 (*vendor_table)->vendor_class[vclass] = NULL;
1446 kfree(vendor_class);
1447 }
1448 error2:
1449 if (vendor) {
1450 *vendor_table = NULL;
1451 kfree(vendor);
1452 }
1453 error1:
1454 return ret;
1455 }
1456
1457 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1458 {
1459 struct ib_mad_port_private *port_priv;
1460 struct ib_mad_mgmt_class_table *class;
1461 struct ib_mad_mgmt_method_table *method;
1462 struct ib_mad_mgmt_vendor_class_table *vendor;
1463 struct ib_mad_mgmt_vendor_class *vendor_class;
1464 int index;
1465 u8 mgmt_class;
1466
1467 /*
1468 * Was MAD registration request supplied
1469 * with original registration ?
1470 */
1471 if (!agent_priv->reg_req) {
1472 goto out;
1473 }
1474
1475 port_priv = agent_priv->qp_info->port_priv;
1476 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1477 class = port_priv->version[
1478 agent_priv->reg_req->mgmt_class_version].class;
1479 if (!class)
1480 goto vendor_check;
1481
1482 method = class->method_table[mgmt_class];
1483 if (method) {
1484 /* Remove any methods for this mad agent */
1485 remove_methods_mad_agent(method, agent_priv);
1486 /* Now, check to see if there are any methods still in use */
1487 if (!check_method_table(method)) {
1488 /* If not, release management method table */
1489 kfree(method);
1490 class->method_table[mgmt_class] = NULL;
1491 /* Any management classes left ? */
1492 if (!check_class_table(class)) {
1493 /* If not, release management class table */
1494 kfree(class);
1495 port_priv->version[
1496 agent_priv->reg_req->
1497 mgmt_class_version].class = NULL;
1498 }
1499 }
1500 }
1501
1502 vendor_check:
1503 if (!is_vendor_class(mgmt_class))
1504 goto out;
1505
1506 /* normalize mgmt_class to vendor range 2 */
1507 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1508 vendor = port_priv->version[
1509 agent_priv->reg_req->mgmt_class_version].vendor;
1510
1511 if (!vendor)
1512 goto out;
1513
1514 vendor_class = vendor->vendor_class[mgmt_class];
1515 if (vendor_class) {
1516 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1517 if (index < 0)
1518 goto out;
1519 method = vendor_class->method_table[index];
1520 if (method) {
1521 /* Remove any methods for this mad agent */
1522 remove_methods_mad_agent(method, agent_priv);
1523 /*
1524 * Now, check to see if there are
1525 * any methods still in use
1526 */
1527 if (!check_method_table(method)) {
1528 /* If not, release management method table */
1529 kfree(method);
1530 vendor_class->method_table[index] = NULL;
1531 memset(vendor_class->oui[index], 0, 3);
1532 /* Any OUIs left ? */
1533 if (!check_vendor_class(vendor_class)) {
1534 /* If not, release vendor class table */
1535 kfree(vendor_class);
1536 vendor->vendor_class[mgmt_class] = NULL;
1537 /* Any other vendor classes left ? */
1538 if (!check_vendor_table(vendor)) {
1539 kfree(vendor);
1540 port_priv->version[
1541 agent_priv->reg_req->
1542 mgmt_class_version].
1543 vendor = NULL;
1544 }
1545 }
1546 }
1547 }
1548 }
1549
1550 out:
1551 return;
1552 }
1553
1554 static struct ib_mad_agent_private *
1555 find_mad_agent(struct ib_mad_port_private *port_priv,
1556 struct ib_mad *mad)
1557 {
1558 struct ib_mad_agent_private *mad_agent = NULL;
1559 unsigned long flags;
1560
1561 spin_lock_irqsave(&port_priv->reg_lock, flags);
1562 if (ib_response_mad(mad)) {
1563 u32 hi_tid;
1564 struct ib_mad_agent_private *entry;
1565
1566 /*
1567 * Routing is based on high 32 bits of transaction ID
1568 * of MAD.
1569 */
1570 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1571 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1572 if (entry->agent.hi_tid == hi_tid) {
1573 mad_agent = entry;
1574 break;
1575 }
1576 }
1577 } else {
1578 struct ib_mad_mgmt_class_table *class;
1579 struct ib_mad_mgmt_method_table *method;
1580 struct ib_mad_mgmt_vendor_class_table *vendor;
1581 struct ib_mad_mgmt_vendor_class *vendor_class;
1582 struct ib_vendor_mad *vendor_mad;
1583 int index;
1584
1585 /*
1586 * Routing is based on version, class, and method
1587 * For "newer" vendor MADs, also based on OUI
1588 */
1589 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1590 goto out;
1591 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1592 class = port_priv->version[
1593 mad->mad_hdr.class_version].class;
1594 if (!class)
1595 goto out;
1596 method = class->method_table[convert_mgmt_class(
1597 mad->mad_hdr.mgmt_class)];
1598 if (method)
1599 mad_agent = method->agent[mad->mad_hdr.method &
1600 ~IB_MGMT_METHOD_RESP];
1601 } else {
1602 vendor = port_priv->version[
1603 mad->mad_hdr.class_version].vendor;
1604 if (!vendor)
1605 goto out;
1606 vendor_class = vendor->vendor_class[vendor_class_index(
1607 mad->mad_hdr.mgmt_class)];
1608 if (!vendor_class)
1609 goto out;
1610 /* Find matching OUI */
1611 vendor_mad = (struct ib_vendor_mad *)mad;
1612 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1613 if (index == -1)
1614 goto out;
1615 method = vendor_class->method_table[index];
1616 if (method) {
1617 mad_agent = method->agent[mad->mad_hdr.method &
1618 ~IB_MGMT_METHOD_RESP];
1619 }
1620 }
1621 }
1622
1623 if (mad_agent) {
1624 if (mad_agent->agent.recv_handler)
1625 atomic_inc(&mad_agent->refcount);
1626 else {
1627 printk(KERN_NOTICE PFX "No receive handler for client "
1628 "%p on port %d\n",
1629 &mad_agent->agent, port_priv->port_num);
1630 mad_agent = NULL;
1631 }
1632 }
1633 out:
1634 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1635
1636 return mad_agent;
1637 }
1638
1639 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1640 {
1641 int valid = 0;
1642
1643 /* Make sure MAD base version is understood */
1644 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1645 printk(KERN_ERR PFX "MAD received with unsupported base "
1646 "version %d\n", mad->mad_hdr.base_version);
1647 goto out;
1648 }
1649
1650 /* Filter SMI packets sent to other than QP0 */
1651 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1652 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1653 if (qp_num == 0)
1654 valid = 1;
1655 } else {
1656 /* Filter GSI packets sent to QP0 */
1657 if (qp_num != 0)
1658 valid = 1;
1659 }
1660
1661 out:
1662 return valid;
1663 }
1664
1665 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1666 struct ib_mad_hdr *mad_hdr)
1667 {
1668 struct ib_rmpp_mad *rmpp_mad;
1669
1670 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1671 return !mad_agent_priv->agent.rmpp_version ||
1672 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1673 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1674 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1675 }
1676
1677 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1678 struct ib_mad_recv_wc *rwc)
1679 {
1680 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1681 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1682 }
1683
1684 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1685 struct ib_mad_send_wr_private *wr,
1686 struct ib_mad_recv_wc *rwc )
1687 {
1688 struct ib_ah_attr attr;
1689 u8 send_resp, rcv_resp;
1690 union ib_gid sgid;
1691 struct ib_device *device = mad_agent_priv->agent.device;
1692 u8 port_num = mad_agent_priv->agent.port_num;
1693 u8 lmc;
1694
1695 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1696 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1697
1698 if (send_resp == rcv_resp)
1699 /* both requests, or both responses. GIDs different */
1700 return 0;
1701
1702 if (ib_query_ah(wr->send_buf.ah, &attr))
1703 /* Assume not equal, to avoid false positives. */
1704 return 0;
1705
1706 if (!!(attr.ah_flags & IB_AH_GRH) !=
1707 !!(rwc->wc->wc_flags & IB_WC_GRH))
1708 /* one has GID, other does not. Assume different */
1709 return 0;
1710
1711 if (!send_resp && rcv_resp) {
1712 /* is request/response. */
1713 if (!(attr.ah_flags & IB_AH_GRH)) {
1714 if (ib_get_cached_lmc(device, port_num, &lmc))
1715 return 0;
1716 return (!lmc || !((attr.src_path_bits ^
1717 rwc->wc->dlid_path_bits) &
1718 ((1 << lmc) - 1)));
1719 } else {
1720 if (ib_get_cached_gid(device, port_num,
1721 attr.grh.sgid_index, &sgid))
1722 return 0;
1723 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1724 16);
1725 }
1726 }
1727
1728 if (!(attr.ah_flags & IB_AH_GRH))
1729 return attr.dlid == rwc->wc->slid;
1730 else
1731 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1732 16);
1733 }
1734
1735 static inline int is_direct(u8 class)
1736 {
1737 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1738 }
1739
1740 struct ib_mad_send_wr_private*
1741 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1742 struct ib_mad_recv_wc *wc)
1743 {
1744 struct ib_mad_send_wr_private *wr;
1745 struct ib_mad *mad;
1746
1747 mad = (struct ib_mad *)wc->recv_buf.mad;
1748
1749 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1750 if ((wr->tid == mad->mad_hdr.tid) &&
1751 rcv_has_same_class(wr, wc) &&
1752 /*
1753 * Don't check GID for direct routed MADs.
1754 * These might have permissive LIDs.
1755 */
1756 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1757 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1758 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1759 }
1760
1761 /*
1762 * It's possible to receive the response before we've
1763 * been notified that the send has completed
1764 */
1765 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1766 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1767 wr->tid == mad->mad_hdr.tid &&
1768 wr->timeout &&
1769 rcv_has_same_class(wr, wc) &&
1770 /*
1771 * Don't check GID for direct routed MADs.
1772 * These might have permissive LIDs.
1773 */
1774 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1775 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1776 /* Verify request has not been canceled */
1777 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1778 }
1779 return NULL;
1780 }
1781
1782 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1783 {
1784 mad_send_wr->timeout = 0;
1785 if (mad_send_wr->refcount == 1)
1786 list_move_tail(&mad_send_wr->agent_list,
1787 &mad_send_wr->mad_agent_priv->done_list);
1788 }
1789
1790 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1791 struct ib_mad_recv_wc *mad_recv_wc)
1792 {
1793 struct ib_mad_send_wr_private *mad_send_wr;
1794 struct ib_mad_send_wc mad_send_wc;
1795 unsigned long flags;
1796
1797 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1798 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1799 if (mad_agent_priv->agent.rmpp_version) {
1800 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1801 mad_recv_wc);
1802 if (!mad_recv_wc) {
1803 deref_mad_agent(mad_agent_priv);
1804 return;
1805 }
1806 }
1807
1808 /* Complete corresponding request */
1809 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1810 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1811 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1812 if (!mad_send_wr) {
1813 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1814 ib_free_recv_mad(mad_recv_wc);
1815 deref_mad_agent(mad_agent_priv);
1816 return;
1817 }
1818 ib_mark_mad_done(mad_send_wr);
1819 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1820
1821 /* Defined behavior is to complete response before request */
1822 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1823 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1824 mad_recv_wc);
1825 atomic_dec(&mad_agent_priv->refcount);
1826
1827 mad_send_wc.status = IB_WC_SUCCESS;
1828 mad_send_wc.vendor_err = 0;
1829 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1830 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1831 } else {
1832 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1833 mad_recv_wc);
1834 deref_mad_agent(mad_agent_priv);
1835 }
1836 }
1837
1838 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1839 struct ib_wc *wc)
1840 {
1841 struct ib_mad_qp_info *qp_info;
1842 struct ib_mad_private_header *mad_priv_hdr;
1843 struct ib_mad_private *recv, *response = NULL;
1844 struct ib_mad_list_head *mad_list;
1845 struct ib_mad_agent_private *mad_agent;
1846 int port_num;
1847
1848 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1849 qp_info = mad_list->mad_queue->qp_info;
1850 dequeue_mad(mad_list);
1851
1852 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1853 mad_list);
1854 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1855 ib_dma_unmap_single(port_priv->device,
1856 recv->header.mapping,
1857 sizeof(struct ib_mad_private) -
1858 sizeof(struct ib_mad_private_header),
1859 DMA_FROM_DEVICE);
1860
1861 /* Setup MAD receive work completion from "normal" work completion */
1862 recv->header.wc = *wc;
1863 recv->header.recv_wc.wc = &recv->header.wc;
1864 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1865 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1866 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1867
1868 if (atomic_read(&qp_info->snoop_count))
1869 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1870
1871 /* Validate MAD */
1872 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1873 goto out;
1874
1875 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1876 if (!response) {
1877 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1878 "for response buffer\n");
1879 goto out;
1880 }
1881
1882 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1883 port_num = wc->port_num;
1884 else
1885 port_num = port_priv->port_num;
1886
1887 if (recv->mad.mad.mad_hdr.mgmt_class ==
1888 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1889 enum smi_forward_action retsmi;
1890
1891 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1892 port_priv->device->node_type,
1893 port_num,
1894 port_priv->device->phys_port_cnt) ==
1895 IB_SMI_DISCARD)
1896 goto out;
1897
1898 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1899 if (retsmi == IB_SMI_LOCAL)
1900 goto local;
1901
1902 if (retsmi == IB_SMI_SEND) { /* don't forward */
1903 if (smi_handle_dr_smp_send(&recv->mad.smp,
1904 port_priv->device->node_type,
1905 port_num) == IB_SMI_DISCARD)
1906 goto out;
1907
1908 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1909 goto out;
1910 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1911 /* forward case for switches */
1912 memcpy(response, recv, sizeof(*response));
1913 response->header.recv_wc.wc = &response->header.wc;
1914 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1915 response->header.recv_wc.recv_buf.grh = &response->grh;
1916
1917 agent_send_response(&response->mad.mad,
1918 &response->grh, wc,
1919 port_priv->device,
1920 smi_get_fwd_port(&recv->mad.smp),
1921 qp_info->qp->qp_num);
1922
1923 goto out;
1924 }
1925 }
1926
1927 local:
1928 /* Give driver "right of first refusal" on incoming MAD */
1929 if (port_priv->device->process_mad) {
1930 int ret;
1931
1932 ret = port_priv->device->process_mad(port_priv->device, 0,
1933 port_priv->port_num,
1934 wc, &recv->grh,
1935 &recv->mad.mad,
1936 &response->mad.mad);
1937 if (ret & IB_MAD_RESULT_SUCCESS) {
1938 if (ret & IB_MAD_RESULT_CONSUMED)
1939 goto out;
1940 if (ret & IB_MAD_RESULT_REPLY) {
1941 agent_send_response(&response->mad.mad,
1942 &recv->grh, wc,
1943 port_priv->device,
1944 port_num,
1945 qp_info->qp->qp_num);
1946 goto out;
1947 }
1948 }
1949 }
1950
1951 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1952 if (mad_agent) {
1953 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1954 /*
1955 * recv is freed up in error cases in ib_mad_complete_recv
1956 * or via recv_handler in ib_mad_complete_recv()
1957 */
1958 recv = NULL;
1959 }
1960
1961 out:
1962 /* Post another receive request for this QP */
1963 if (response) {
1964 ib_mad_post_receive_mads(qp_info, response);
1965 if (recv)
1966 kmem_cache_free(ib_mad_cache, recv);
1967 } else
1968 ib_mad_post_receive_mads(qp_info, recv);
1969 }
1970
1971 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1972 {
1973 struct ib_mad_send_wr_private *mad_send_wr;
1974 unsigned long delay;
1975
1976 if (list_empty(&mad_agent_priv->wait_list)) {
1977 cancel_delayed_work(&mad_agent_priv->timed_work);
1978 } else {
1979 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1980 struct ib_mad_send_wr_private,
1981 agent_list);
1982
1983 if (time_after(mad_agent_priv->timeout,
1984 mad_send_wr->timeout)) {
1985 mad_agent_priv->timeout = mad_send_wr->timeout;
1986 cancel_delayed_work(&mad_agent_priv->timed_work);
1987 delay = mad_send_wr->timeout - jiffies;
1988 if ((long)delay <= 0)
1989 delay = 1;
1990 queue_delayed_work(mad_agent_priv->qp_info->
1991 port_priv->wq,
1992 &mad_agent_priv->timed_work, delay);
1993 }
1994 }
1995 }
1996
1997 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1998 {
1999 struct ib_mad_agent_private *mad_agent_priv;
2000 struct ib_mad_send_wr_private *temp_mad_send_wr;
2001 struct list_head *list_item;
2002 unsigned long delay;
2003
2004 mad_agent_priv = mad_send_wr->mad_agent_priv;
2005 list_del(&mad_send_wr->agent_list);
2006
2007 delay = mad_send_wr->timeout;
2008 mad_send_wr->timeout += jiffies;
2009
2010 if (delay) {
2011 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2012 temp_mad_send_wr = list_entry(list_item,
2013 struct ib_mad_send_wr_private,
2014 agent_list);
2015 if (time_after(mad_send_wr->timeout,
2016 temp_mad_send_wr->timeout))
2017 break;
2018 }
2019 }
2020 else
2021 list_item = &mad_agent_priv->wait_list;
2022 list_add(&mad_send_wr->agent_list, list_item);
2023
2024 /* Reschedule a work item if we have a shorter timeout */
2025 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2026 cancel_delayed_work(&mad_agent_priv->timed_work);
2027 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2028 &mad_agent_priv->timed_work, delay);
2029 }
2030 }
2031
2032 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2033 int timeout_ms)
2034 {
2035 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2036 wait_for_response(mad_send_wr);
2037 }
2038
2039 /*
2040 * Process a send work completion
2041 */
2042 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2043 struct ib_mad_send_wc *mad_send_wc)
2044 {
2045 struct ib_mad_agent_private *mad_agent_priv;
2046 unsigned long flags;
2047 int ret;
2048
2049 mad_agent_priv = mad_send_wr->mad_agent_priv;
2050 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2051 if (mad_agent_priv->agent.rmpp_version) {
2052 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2053 if (ret == IB_RMPP_RESULT_CONSUMED)
2054 goto done;
2055 } else
2056 ret = IB_RMPP_RESULT_UNHANDLED;
2057
2058 if (mad_send_wc->status != IB_WC_SUCCESS &&
2059 mad_send_wr->status == IB_WC_SUCCESS) {
2060 mad_send_wr->status = mad_send_wc->status;
2061 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2062 }
2063
2064 if (--mad_send_wr->refcount > 0) {
2065 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2066 mad_send_wr->status == IB_WC_SUCCESS) {
2067 wait_for_response(mad_send_wr);
2068 }
2069 goto done;
2070 }
2071
2072 /* Remove send from MAD agent and notify client of completion */
2073 list_del(&mad_send_wr->agent_list);
2074 adjust_timeout(mad_agent_priv);
2075 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2076
2077 if (mad_send_wr->status != IB_WC_SUCCESS )
2078 mad_send_wc->status = mad_send_wr->status;
2079 if (ret == IB_RMPP_RESULT_INTERNAL)
2080 ib_rmpp_send_handler(mad_send_wc);
2081 else
2082 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2083 mad_send_wc);
2084
2085 /* Release reference on agent taken when sending */
2086 deref_mad_agent(mad_agent_priv);
2087 return;
2088 done:
2089 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2090 }
2091
2092 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2093 struct ib_wc *wc)
2094 {
2095 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2096 struct ib_mad_list_head *mad_list;
2097 struct ib_mad_qp_info *qp_info;
2098 struct ib_mad_queue *send_queue;
2099 struct ib_send_wr *bad_send_wr;
2100 struct ib_mad_send_wc mad_send_wc;
2101 unsigned long flags;
2102 int ret;
2103
2104 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2105 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2106 mad_list);
2107 send_queue = mad_list->mad_queue;
2108 qp_info = send_queue->qp_info;
2109
2110 retry:
2111 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2112 mad_send_wr->header_mapping,
2113 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2114 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2115 mad_send_wr->payload_mapping,
2116 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2117 queued_send_wr = NULL;
2118 spin_lock_irqsave(&send_queue->lock, flags);
2119 list_del(&mad_list->list);
2120
2121 /* Move queued send to the send queue */
2122 if (send_queue->count-- > send_queue->max_active) {
2123 mad_list = container_of(qp_info->overflow_list.next,
2124 struct ib_mad_list_head, list);
2125 queued_send_wr = container_of(mad_list,
2126 struct ib_mad_send_wr_private,
2127 mad_list);
2128 list_move_tail(&mad_list->list, &send_queue->list);
2129 }
2130 spin_unlock_irqrestore(&send_queue->lock, flags);
2131
2132 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2133 mad_send_wc.status = wc->status;
2134 mad_send_wc.vendor_err = wc->vendor_err;
2135 if (atomic_read(&qp_info->snoop_count))
2136 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2137 IB_MAD_SNOOP_SEND_COMPLETIONS);
2138 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2139
2140 if (queued_send_wr) {
2141 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2142 &bad_send_wr);
2143 if (ret) {
2144 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2145 mad_send_wr = queued_send_wr;
2146 wc->status = IB_WC_LOC_QP_OP_ERR;
2147 goto retry;
2148 }
2149 }
2150 }
2151
2152 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2153 {
2154 struct ib_mad_send_wr_private *mad_send_wr;
2155 struct ib_mad_list_head *mad_list;
2156 unsigned long flags;
2157
2158 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2159 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2160 mad_send_wr = container_of(mad_list,
2161 struct ib_mad_send_wr_private,
2162 mad_list);
2163 mad_send_wr->retry = 1;
2164 }
2165 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2166 }
2167
2168 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2169 struct ib_wc *wc)
2170 {
2171 struct ib_mad_list_head *mad_list;
2172 struct ib_mad_qp_info *qp_info;
2173 struct ib_mad_send_wr_private *mad_send_wr;
2174 int ret;
2175
2176 /* Determine if failure was a send or receive */
2177 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2178 qp_info = mad_list->mad_queue->qp_info;
2179 if (mad_list->mad_queue == &qp_info->recv_queue)
2180 /*
2181 * Receive errors indicate that the QP has entered the error
2182 * state - error handling/shutdown code will cleanup
2183 */
2184 return;
2185
2186 /*
2187 * Send errors will transition the QP to SQE - move
2188 * QP to RTS and repost flushed work requests
2189 */
2190 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2191 mad_list);
2192 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2193 if (mad_send_wr->retry) {
2194 /* Repost send */
2195 struct ib_send_wr *bad_send_wr;
2196
2197 mad_send_wr->retry = 0;
2198 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2199 &bad_send_wr);
2200 if (ret)
2201 ib_mad_send_done_handler(port_priv, wc);
2202 } else
2203 ib_mad_send_done_handler(port_priv, wc);
2204 } else {
2205 struct ib_qp_attr *attr;
2206
2207 /* Transition QP to RTS and fail offending send */
2208 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2209 if (attr) {
2210 attr->qp_state = IB_QPS_RTS;
2211 attr->cur_qp_state = IB_QPS_SQE;
2212 ret = ib_modify_qp(qp_info->qp, attr,
2213 IB_QP_STATE | IB_QP_CUR_STATE);
2214 kfree(attr);
2215 if (ret)
2216 printk(KERN_ERR PFX "mad_error_handler - "
2217 "ib_modify_qp to RTS : %d\n", ret);
2218 else
2219 mark_sends_for_retry(qp_info);
2220 }
2221 ib_mad_send_done_handler(port_priv, wc);
2222 }
2223 }
2224
2225 /*
2226 * IB MAD completion callback
2227 */
2228 static void ib_mad_completion_handler(struct work_struct *work)
2229 {
2230 struct ib_mad_port_private *port_priv;
2231 struct ib_wc wc;
2232
2233 port_priv = container_of(work, struct ib_mad_port_private, work);
2234 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2235
2236 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2237 if (wc.status == IB_WC_SUCCESS) {
2238 switch (wc.opcode) {
2239 case IB_WC_SEND:
2240 ib_mad_send_done_handler(port_priv, &wc);
2241 break;
2242 case IB_WC_RECV:
2243 ib_mad_recv_done_handler(port_priv, &wc);
2244 break;
2245 default:
2246 BUG_ON(1);
2247 break;
2248 }
2249 } else
2250 mad_error_handler(port_priv, &wc);
2251 }
2252 }
2253
2254 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2255 {
2256 unsigned long flags;
2257 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2258 struct ib_mad_send_wc mad_send_wc;
2259 struct list_head cancel_list;
2260
2261 INIT_LIST_HEAD(&cancel_list);
2262
2263 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2264 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2265 &mad_agent_priv->send_list, agent_list) {
2266 if (mad_send_wr->status == IB_WC_SUCCESS) {
2267 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2268 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2269 }
2270 }
2271
2272 /* Empty wait list to prevent receives from finding a request */
2273 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2274 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2275
2276 /* Report all cancelled requests */
2277 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2278 mad_send_wc.vendor_err = 0;
2279
2280 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2281 &cancel_list, agent_list) {
2282 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2283 list_del(&mad_send_wr->agent_list);
2284 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2285 &mad_send_wc);
2286 atomic_dec(&mad_agent_priv->refcount);
2287 }
2288 }
2289
2290 static struct ib_mad_send_wr_private*
2291 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2292 struct ib_mad_send_buf *send_buf)
2293 {
2294 struct ib_mad_send_wr_private *mad_send_wr;
2295
2296 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2297 agent_list) {
2298 if (&mad_send_wr->send_buf == send_buf)
2299 return mad_send_wr;
2300 }
2301
2302 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2303 agent_list) {
2304 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2305 &mad_send_wr->send_buf == send_buf)
2306 return mad_send_wr;
2307 }
2308 return NULL;
2309 }
2310
2311 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2312 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2313 {
2314 struct ib_mad_agent_private *mad_agent_priv;
2315 struct ib_mad_send_wr_private *mad_send_wr;
2316 unsigned long flags;
2317 int active;
2318
2319 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2320 agent);
2321 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2322 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2323 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2324 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2325 return -EINVAL;
2326 }
2327
2328 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2329 if (!timeout_ms) {
2330 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2331 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2332 }
2333
2334 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2335 if (active)
2336 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2337 else
2338 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2339
2340 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2341 return 0;
2342 }
2343 EXPORT_SYMBOL(ib_modify_mad);
2344
2345 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2346 struct ib_mad_send_buf *send_buf)
2347 {
2348 ib_modify_mad(mad_agent, send_buf, 0);
2349 }
2350 EXPORT_SYMBOL(ib_cancel_mad);
2351
2352 static void local_completions(struct work_struct *work)
2353 {
2354 struct ib_mad_agent_private *mad_agent_priv;
2355 struct ib_mad_local_private *local;
2356 struct ib_mad_agent_private *recv_mad_agent;
2357 unsigned long flags;
2358 int free_mad;
2359 struct ib_wc wc;
2360 struct ib_mad_send_wc mad_send_wc;
2361
2362 mad_agent_priv =
2363 container_of(work, struct ib_mad_agent_private, local_work);
2364
2365 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2366 while (!list_empty(&mad_agent_priv->local_list)) {
2367 local = list_entry(mad_agent_priv->local_list.next,
2368 struct ib_mad_local_private,
2369 completion_list);
2370 list_del(&local->completion_list);
2371 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2372 free_mad = 0;
2373 if (local->mad_priv) {
2374 recv_mad_agent = local->recv_mad_agent;
2375 if (!recv_mad_agent) {
2376 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2377 free_mad = 1;
2378 goto local_send_completion;
2379 }
2380
2381 /*
2382 * Defined behavior is to complete response
2383 * before request
2384 */
2385 build_smp_wc(recv_mad_agent->agent.qp,
2386 (unsigned long) local->mad_send_wr,
2387 be16_to_cpu(IB_LID_PERMISSIVE),
2388 0, recv_mad_agent->agent.port_num, &wc);
2389
2390 local->mad_priv->header.recv_wc.wc = &wc;
2391 local->mad_priv->header.recv_wc.mad_len =
2392 sizeof(struct ib_mad);
2393 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2394 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2395 &local->mad_priv->header.recv_wc.rmpp_list);
2396 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2397 local->mad_priv->header.recv_wc.recv_buf.mad =
2398 &local->mad_priv->mad.mad;
2399 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2400 snoop_recv(recv_mad_agent->qp_info,
2401 &local->mad_priv->header.recv_wc,
2402 IB_MAD_SNOOP_RECVS);
2403 recv_mad_agent->agent.recv_handler(
2404 &recv_mad_agent->agent,
2405 &local->mad_priv->header.recv_wc);
2406 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2407 atomic_dec(&recv_mad_agent->refcount);
2408 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2409 }
2410
2411 local_send_completion:
2412 /* Complete send */
2413 mad_send_wc.status = IB_WC_SUCCESS;
2414 mad_send_wc.vendor_err = 0;
2415 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2416 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2417 snoop_send(mad_agent_priv->qp_info,
2418 &local->mad_send_wr->send_buf,
2419 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2420 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2421 &mad_send_wc);
2422
2423 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2424 atomic_dec(&mad_agent_priv->refcount);
2425 if (free_mad)
2426 kmem_cache_free(ib_mad_cache, local->mad_priv);
2427 kfree(local);
2428 }
2429 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2430 }
2431
2432 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2433 {
2434 int ret;
2435
2436 if (!mad_send_wr->retries_left)
2437 return -ETIMEDOUT;
2438
2439 mad_send_wr->retries_left--;
2440 mad_send_wr->send_buf.retries++;
2441
2442 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2443
2444 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2445 ret = ib_retry_rmpp(mad_send_wr);
2446 switch (ret) {
2447 case IB_RMPP_RESULT_UNHANDLED:
2448 ret = ib_send_mad(mad_send_wr);
2449 break;
2450 case IB_RMPP_RESULT_CONSUMED:
2451 ret = 0;
2452 break;
2453 default:
2454 ret = -ECOMM;
2455 break;
2456 }
2457 } else
2458 ret = ib_send_mad(mad_send_wr);
2459
2460 if (!ret) {
2461 mad_send_wr->refcount++;
2462 list_add_tail(&mad_send_wr->agent_list,
2463 &mad_send_wr->mad_agent_priv->send_list);
2464 }
2465 return ret;
2466 }
2467
2468 static void timeout_sends(struct work_struct *work)
2469 {
2470 struct ib_mad_agent_private *mad_agent_priv;
2471 struct ib_mad_send_wr_private *mad_send_wr;
2472 struct ib_mad_send_wc mad_send_wc;
2473 unsigned long flags, delay;
2474
2475 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2476 timed_work.work);
2477 mad_send_wc.vendor_err = 0;
2478
2479 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2480 while (!list_empty(&mad_agent_priv->wait_list)) {
2481 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2482 struct ib_mad_send_wr_private,
2483 agent_list);
2484
2485 if (time_after(mad_send_wr->timeout, jiffies)) {
2486 delay = mad_send_wr->timeout - jiffies;
2487 if ((long)delay <= 0)
2488 delay = 1;
2489 queue_delayed_work(mad_agent_priv->qp_info->
2490 port_priv->wq,
2491 &mad_agent_priv->timed_work, delay);
2492 break;
2493 }
2494
2495 list_del(&mad_send_wr->agent_list);
2496 if (mad_send_wr->status == IB_WC_SUCCESS &&
2497 !retry_send(mad_send_wr))
2498 continue;
2499
2500 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2501
2502 if (mad_send_wr->status == IB_WC_SUCCESS)
2503 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2504 else
2505 mad_send_wc.status = mad_send_wr->status;
2506 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2507 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2508 &mad_send_wc);
2509
2510 atomic_dec(&mad_agent_priv->refcount);
2511 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2512 }
2513 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2514 }
2515
2516 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2517 {
2518 struct ib_mad_port_private *port_priv = cq->cq_context;
2519 unsigned long flags;
2520
2521 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2522 if (!list_empty(&port_priv->port_list))
2523 queue_work(port_priv->wq, &port_priv->work);
2524 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2525 }
2526
2527 /*
2528 * Allocate receive MADs and post receive WRs for them
2529 */
2530 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2531 struct ib_mad_private *mad)
2532 {
2533 unsigned long flags;
2534 int post, ret;
2535 struct ib_mad_private *mad_priv;
2536 struct ib_sge sg_list;
2537 struct ib_recv_wr recv_wr, *bad_recv_wr;
2538 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2539
2540 /* Initialize common scatter list fields */
2541 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2542 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2543
2544 /* Initialize common receive WR fields */
2545 recv_wr.next = NULL;
2546 recv_wr.sg_list = &sg_list;
2547 recv_wr.num_sge = 1;
2548
2549 do {
2550 /* Allocate and map receive buffer */
2551 if (mad) {
2552 mad_priv = mad;
2553 mad = NULL;
2554 } else {
2555 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2556 if (!mad_priv) {
2557 printk(KERN_ERR PFX "No memory for receive buffer\n");
2558 ret = -ENOMEM;
2559 break;
2560 }
2561 }
2562 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2563 &mad_priv->grh,
2564 sizeof *mad_priv -
2565 sizeof mad_priv->header,
2566 DMA_FROM_DEVICE);
2567 mad_priv->header.mapping = sg_list.addr;
2568 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2569 mad_priv->header.mad_list.mad_queue = recv_queue;
2570
2571 /* Post receive WR */
2572 spin_lock_irqsave(&recv_queue->lock, flags);
2573 post = (++recv_queue->count < recv_queue->max_active);
2574 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2575 spin_unlock_irqrestore(&recv_queue->lock, flags);
2576 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2577 if (ret) {
2578 spin_lock_irqsave(&recv_queue->lock, flags);
2579 list_del(&mad_priv->header.mad_list.list);
2580 recv_queue->count--;
2581 spin_unlock_irqrestore(&recv_queue->lock, flags);
2582 ib_dma_unmap_single(qp_info->port_priv->device,
2583 mad_priv->header.mapping,
2584 sizeof *mad_priv -
2585 sizeof mad_priv->header,
2586 DMA_FROM_DEVICE);
2587 kmem_cache_free(ib_mad_cache, mad_priv);
2588 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2589 break;
2590 }
2591 } while (post);
2592
2593 return ret;
2594 }
2595
2596 /*
2597 * Return all the posted receive MADs
2598 */
2599 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2600 {
2601 struct ib_mad_private_header *mad_priv_hdr;
2602 struct ib_mad_private *recv;
2603 struct ib_mad_list_head *mad_list;
2604
2605 while (!list_empty(&qp_info->recv_queue.list)) {
2606
2607 mad_list = list_entry(qp_info->recv_queue.list.next,
2608 struct ib_mad_list_head, list);
2609 mad_priv_hdr = container_of(mad_list,
2610 struct ib_mad_private_header,
2611 mad_list);
2612 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2613 header);
2614
2615 /* Remove from posted receive MAD list */
2616 list_del(&mad_list->list);
2617
2618 ib_dma_unmap_single(qp_info->port_priv->device,
2619 recv->header.mapping,
2620 sizeof(struct ib_mad_private) -
2621 sizeof(struct ib_mad_private_header),
2622 DMA_FROM_DEVICE);
2623 kmem_cache_free(ib_mad_cache, recv);
2624 }
2625
2626 qp_info->recv_queue.count = 0;
2627 }
2628
2629 /*
2630 * Start the port
2631 */
2632 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2633 {
2634 int ret, i;
2635 struct ib_qp_attr *attr;
2636 struct ib_qp *qp;
2637
2638 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2639 if (!attr) {
2640 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2641 return -ENOMEM;
2642 }
2643
2644 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2645 qp = port_priv->qp_info[i].qp;
2646 /*
2647 * PKey index for QP1 is irrelevant but
2648 * one is needed for the Reset to Init transition
2649 */
2650 attr->qp_state = IB_QPS_INIT;
2651 attr->pkey_index = 0;
2652 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2653 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2654 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2655 if (ret) {
2656 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2657 "INIT: %d\n", i, ret);
2658 goto out;
2659 }
2660
2661 attr->qp_state = IB_QPS_RTR;
2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2663 if (ret) {
2664 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2665 "RTR: %d\n", i, ret);
2666 goto out;
2667 }
2668
2669 attr->qp_state = IB_QPS_RTS;
2670 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2672 if (ret) {
2673 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674 "RTS: %d\n", i, ret);
2675 goto out;
2676 }
2677 }
2678
2679 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2680 if (ret) {
2681 printk(KERN_ERR PFX "Failed to request completion "
2682 "notification: %d\n", ret);
2683 goto out;
2684 }
2685
2686 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2687 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2688 if (ret) {
2689 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2690 goto out;
2691 }
2692 }
2693 out:
2694 kfree(attr);
2695 return ret;
2696 }
2697
2698 static void qp_event_handler(struct ib_event *event, void *qp_context)
2699 {
2700 struct ib_mad_qp_info *qp_info = qp_context;
2701
2702 /* It's worse than that! He's dead, Jim! */
2703 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2704 event->event, qp_info->qp->qp_num);
2705 }
2706
2707 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2708 struct ib_mad_queue *mad_queue)
2709 {
2710 mad_queue->qp_info = qp_info;
2711 mad_queue->count = 0;
2712 spin_lock_init(&mad_queue->lock);
2713 INIT_LIST_HEAD(&mad_queue->list);
2714 }
2715
2716 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2717 struct ib_mad_qp_info *qp_info)
2718 {
2719 qp_info->port_priv = port_priv;
2720 init_mad_queue(qp_info, &qp_info->send_queue);
2721 init_mad_queue(qp_info, &qp_info->recv_queue);
2722 INIT_LIST_HEAD(&qp_info->overflow_list);
2723 spin_lock_init(&qp_info->snoop_lock);
2724 qp_info->snoop_table = NULL;
2725 qp_info->snoop_table_size = 0;
2726 atomic_set(&qp_info->snoop_count, 0);
2727 }
2728
2729 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2730 enum ib_qp_type qp_type)
2731 {
2732 struct ib_qp_init_attr qp_init_attr;
2733 int ret;
2734
2735 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2736 qp_init_attr.send_cq = qp_info->port_priv->cq;
2737 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2738 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2739 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2740 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2741 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2742 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2743 qp_init_attr.qp_type = qp_type;
2744 qp_init_attr.port_num = qp_info->port_priv->port_num;
2745 qp_init_attr.qp_context = qp_info;
2746 qp_init_attr.event_handler = qp_event_handler;
2747 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2748 if (IS_ERR(qp_info->qp)) {
2749 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2750 get_spl_qp_index(qp_type));
2751 ret = PTR_ERR(qp_info->qp);
2752 goto error;
2753 }
2754 /* Use minimum queue sizes unless the CQ is resized */
2755 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2756 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2757 return 0;
2758
2759 error:
2760 return ret;
2761 }
2762
2763 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2764 {
2765 ib_destroy_qp(qp_info->qp);
2766 kfree(qp_info->snoop_table);
2767 }
2768
2769 /*
2770 * Open the port
2771 * Create the QP, PD, MR, and CQ if needed
2772 */
2773 static int ib_mad_port_open(struct ib_device *device,
2774 int port_num)
2775 {
2776 int ret, cq_size;
2777 struct ib_mad_port_private *port_priv;
2778 unsigned long flags;
2779 char name[sizeof "ib_mad123"];
2780
2781 /* Create new device info */
2782 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2783 if (!port_priv) {
2784 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2785 return -ENOMEM;
2786 }
2787
2788 port_priv->device = device;
2789 port_priv->port_num = port_num;
2790 spin_lock_init(&port_priv->reg_lock);
2791 INIT_LIST_HEAD(&port_priv->agent_list);
2792 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2793 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2794
2795 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2796 port_priv->cq = ib_create_cq(port_priv->device,
2797 ib_mad_thread_completion_handler,
2798 NULL, port_priv, cq_size, 0);
2799 if (IS_ERR(port_priv->cq)) {
2800 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2801 ret = PTR_ERR(port_priv->cq);
2802 goto error3;
2803 }
2804
2805 port_priv->pd = ib_alloc_pd(device);
2806 if (IS_ERR(port_priv->pd)) {
2807 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2808 ret = PTR_ERR(port_priv->pd);
2809 goto error4;
2810 }
2811
2812 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2813 if (IS_ERR(port_priv->mr)) {
2814 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2815 ret = PTR_ERR(port_priv->mr);
2816 goto error5;
2817 }
2818
2819 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2820 if (ret)
2821 goto error6;
2822 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2823 if (ret)
2824 goto error7;
2825
2826 snprintf(name, sizeof name, "ib_mad%d", port_num);
2827 port_priv->wq = create_singlethread_workqueue(name);
2828 if (!port_priv->wq) {
2829 ret = -ENOMEM;
2830 goto error8;
2831 }
2832 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2833
2834 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2835 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2836 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2837
2838 ret = ib_mad_port_start(port_priv);
2839 if (ret) {
2840 printk(KERN_ERR PFX "Couldn't start port\n");
2841 goto error9;
2842 }
2843
2844 return 0;
2845
2846 error9:
2847 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2848 list_del_init(&port_priv->port_list);
2849 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2850
2851 destroy_workqueue(port_priv->wq);
2852 error8:
2853 destroy_mad_qp(&port_priv->qp_info[1]);
2854 error7:
2855 destroy_mad_qp(&port_priv->qp_info[0]);
2856 error6:
2857 ib_dereg_mr(port_priv->mr);
2858 error5:
2859 ib_dealloc_pd(port_priv->pd);
2860 error4:
2861 ib_destroy_cq(port_priv->cq);
2862 cleanup_recv_queue(&port_priv->qp_info[1]);
2863 cleanup_recv_queue(&port_priv->qp_info[0]);
2864 error3:
2865 kfree(port_priv);
2866
2867 return ret;
2868 }
2869
2870 /*
2871 * Close the port
2872 * If there are no classes using the port, free the port
2873 * resources (CQ, MR, PD, QP) and remove the port's info structure
2874 */
2875 static int ib_mad_port_close(struct ib_device *device, int port_num)
2876 {
2877 struct ib_mad_port_private *port_priv;
2878 unsigned long flags;
2879
2880 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2881 port_priv = __ib_get_mad_port(device, port_num);
2882 if (port_priv == NULL) {
2883 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2884 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2885 return -ENODEV;
2886 }
2887 list_del_init(&port_priv->port_list);
2888 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2889
2890 destroy_workqueue(port_priv->wq);
2891 destroy_mad_qp(&port_priv->qp_info[1]);
2892 destroy_mad_qp(&port_priv->qp_info[0]);
2893 ib_dereg_mr(port_priv->mr);
2894 ib_dealloc_pd(port_priv->pd);
2895 ib_destroy_cq(port_priv->cq);
2896 cleanup_recv_queue(&port_priv->qp_info[1]);
2897 cleanup_recv_queue(&port_priv->qp_info[0]);
2898 /* XXX: Handle deallocation of MAD registration tables */
2899
2900 kfree(port_priv);
2901
2902 return 0;
2903 }
2904
2905 static void ib_mad_init_device(struct ib_device *device)
2906 {
2907 int start, end, i;
2908
2909 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2910 return;
2911
2912 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2913 start = 0;
2914 end = 0;
2915 } else {
2916 start = 1;
2917 end = device->phys_port_cnt;
2918 }
2919
2920 for (i = start; i <= end; i++) {
2921 if (ib_mad_port_open(device, i)) {
2922 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2923 device->name, i);
2924 goto error;
2925 }
2926 if (ib_agent_port_open(device, i)) {
2927 printk(KERN_ERR PFX "Couldn't open %s port %d "
2928 "for agents\n",
2929 device->name, i);
2930 goto error_agent;
2931 }
2932 }
2933 return;
2934
2935 error_agent:
2936 if (ib_mad_port_close(device, i))
2937 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2938 device->name, i);
2939
2940 error:
2941 i--;
2942
2943 while (i >= start) {
2944 if (ib_agent_port_close(device, i))
2945 printk(KERN_ERR PFX "Couldn't close %s port %d "
2946 "for agents\n",
2947 device->name, i);
2948 if (ib_mad_port_close(device, i))
2949 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2950 device->name, i);
2951 i--;
2952 }
2953 }
2954
2955 static void ib_mad_remove_device(struct ib_device *device)
2956 {
2957 int i, num_ports, cur_port;
2958
2959 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2960 num_ports = 1;
2961 cur_port = 0;
2962 } else {
2963 num_ports = device->phys_port_cnt;
2964 cur_port = 1;
2965 }
2966 for (i = 0; i < num_ports; i++, cur_port++) {
2967 if (ib_agent_port_close(device, cur_port))
2968 printk(KERN_ERR PFX "Couldn't close %s port %d "
2969 "for agents\n",
2970 device->name, cur_port);
2971 if (ib_mad_port_close(device, cur_port))
2972 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2973 device->name, cur_port);
2974 }
2975 }
2976
2977 static struct ib_client mad_client = {
2978 .name = "mad",
2979 .add = ib_mad_init_device,
2980 .remove = ib_mad_remove_device
2981 };
2982
2983 static int __init ib_mad_init_module(void)
2984 {
2985 int ret;
2986
2987 spin_lock_init(&ib_mad_port_list_lock);
2988
2989 ib_mad_cache = kmem_cache_create("ib_mad",
2990 sizeof(struct ib_mad_private),
2991 0,
2992 SLAB_HWCACHE_ALIGN,
2993 NULL);
2994 if (!ib_mad_cache) {
2995 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2996 ret = -ENOMEM;
2997 goto error1;
2998 }
2999
3000 INIT_LIST_HEAD(&ib_mad_port_list);
3001
3002 if (ib_register_client(&mad_client)) {
3003 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3004 ret = -EINVAL;
3005 goto error2;
3006 }
3007
3008 return 0;
3009
3010 error2:
3011 kmem_cache_destroy(ib_mad_cache);
3012 error1:
3013 return ret;
3014 }
3015
3016 static void __exit ib_mad_cleanup_module(void)
3017 {
3018 ib_unregister_client(&mad_client);
3019 kmem_cache_destroy(ib_mad_cache);
3020 }
3021
3022 module_init(ib_mad_init_module);
3023 module_exit(ib_mad_cleanup_module);
3024
Support for the Chinese Samsung S3C2440 based development boards