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mfd: Copy the device pointer to the twl4030-madc structure
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / infiniband / core / mad.c
blobb4d8672a3e4ef539481a4089cc25f8c7b8f38901
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 */
36 #include <linux/dma-mapping.h>
37 #include <linux/slab.h>
38 #include <rdma/ib_cache.h>
39
40 #include "mad_priv.h"
41 #include "mad_rmpp.h"
42 #include "smi.h"
43 #include "agent.h"
44
45 MODULE_LICENSE("Dual BSD/GPL");
46 MODULE_DESCRIPTION("kernel IB MAD API");
47 MODULE_AUTHOR("Hal Rosenstock");
48 MODULE_AUTHOR("Sean Hefty");
49
50 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
51 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
52
53 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
54 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
55 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
56 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
57
58 static struct kmem_cache *ib_mad_cache;
59
60 static struct list_head ib_mad_port_list;
61 static u32 ib_mad_client_id = 0;
62
63 /* Port list lock */
64 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
65
66 /* Forward declarations */
67 static int method_in_use(struct ib_mad_mgmt_method_table **method,
68 struct ib_mad_reg_req *mad_reg_req);
69 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
70 static struct ib_mad_agent_private *find_mad_agent(
71 struct ib_mad_port_private *port_priv,
72 struct ib_mad *mad);
73 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
74 struct ib_mad_private *mad);
75 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
76 static void timeout_sends(struct work_struct *work);
77 static void local_completions(struct work_struct *work);
78 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
79 struct ib_mad_agent_private *agent_priv,
80 u8 mgmt_class);
81 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
82 struct ib_mad_agent_private *agent_priv);
83
84 /*
85 * Returns a ib_mad_port_private structure or NULL for a device/port
86 * Assumes ib_mad_port_list_lock is being held
87 */
88 static inline struct ib_mad_port_private *
89 __ib_get_mad_port(struct ib_device *device, int port_num)
90 {
91 struct ib_mad_port_private *entry;
92
93 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
94 if (entry->device == device && entry->port_num == port_num)
95 return entry;
96 }
97 return NULL;
98 }
99
100 /*
101 * Wrapper function to return a ib_mad_port_private structure or NULL
102 * for a device/port
103 */
104 static inline struct ib_mad_port_private *
105 ib_get_mad_port(struct ib_device *device, int port_num)
106 {
107 struct ib_mad_port_private *entry;
108 unsigned long flags;
109
110 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
111 entry = __ib_get_mad_port(device, port_num);
112 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
113
114 return entry;
115 }
116
117 static inline u8 convert_mgmt_class(u8 mgmt_class)
118 {
119 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
120 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
121 0 : mgmt_class;
122 }
123
124 static int get_spl_qp_index(enum ib_qp_type qp_type)
125 {
126 switch (qp_type)
127 {
128 case IB_QPT_SMI:
129 return 0;
130 case IB_QPT_GSI:
131 return 1;
132 default:
133 return -1;
134 }
135 }
136
137 static int vendor_class_index(u8 mgmt_class)
138 {
139 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
140 }
141
142 static int is_vendor_class(u8 mgmt_class)
143 {
144 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
145 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
146 return 0;
147 return 1;
148 }
149
150 static int is_vendor_oui(char *oui)
151 {
152 if (oui[0] || oui[1] || oui[2])
153 return 1;
154 return 0;
155 }
156
157 static int is_vendor_method_in_use(
158 struct ib_mad_mgmt_vendor_class *vendor_class,
159 struct ib_mad_reg_req *mad_reg_req)
160 {
161 struct ib_mad_mgmt_method_table *method;
162 int i;
163
164 for (i = 0; i < MAX_MGMT_OUI; i++) {
165 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
166 method = vendor_class->method_table[i];
167 if (method) {
168 if (method_in_use(&method, mad_reg_req))
169 return 1;
170 else
171 break;
172 }
173 }
174 }
175 return 0;
176 }
177
178 int ib_response_mad(struct ib_mad *mad)
179 {
180 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
181 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
182 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
183 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
184 }
185 EXPORT_SYMBOL(ib_response_mad);
186
187 /*
188 * ib_register_mad_agent - Register to send/receive MADs
189 */
190 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
191 u8 port_num,
192 enum ib_qp_type qp_type,
193 struct ib_mad_reg_req *mad_reg_req,
194 u8 rmpp_version,
195 ib_mad_send_handler send_handler,
196 ib_mad_recv_handler recv_handler,
197 void *context)
198 {
199 struct ib_mad_port_private *port_priv;
200 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
201 struct ib_mad_agent_private *mad_agent_priv;
202 struct ib_mad_reg_req *reg_req = NULL;
203 struct ib_mad_mgmt_class_table *class;
204 struct ib_mad_mgmt_vendor_class_table *vendor;
205 struct ib_mad_mgmt_vendor_class *vendor_class;
206 struct ib_mad_mgmt_method_table *method;
207 int ret2, qpn;
208 unsigned long flags;
209 u8 mgmt_class, vclass;
210
211 /* Validate parameters */
212 qpn = get_spl_qp_index(qp_type);
213 if (qpn == -1)
214 goto error1;
215
216 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
217 goto error1;
218
219 /* Validate MAD registration request if supplied */
220 if (mad_reg_req) {
221 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
222 goto error1;
223 if (!recv_handler)
224 goto error1;
225 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
226 /*
227 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
228 * one in this range currently allowed
229 */
230 if (mad_reg_req->mgmt_class !=
231 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
232 goto error1;
233 } else if (mad_reg_req->mgmt_class == 0) {
234 /*
235 * Class 0 is reserved in IBA and is used for
236 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
237 */
238 goto error1;
239 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
240 /*
241 * If class is in "new" vendor range,
242 * ensure supplied OUI is not zero
243 */
244 if (!is_vendor_oui(mad_reg_req->oui))
245 goto error1;
246 }
247 /* Make sure class supplied is consistent with RMPP */
248 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
249 if (rmpp_version)
250 goto error1;
251 }
252 /* Make sure class supplied is consistent with QP type */
253 if (qp_type == IB_QPT_SMI) {
254 if ((mad_reg_req->mgmt_class !=
255 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
256 (mad_reg_req->mgmt_class !=
257 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
258 goto error1;
259 } else {
260 if ((mad_reg_req->mgmt_class ==
261 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
262 (mad_reg_req->mgmt_class ==
263 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
264 goto error1;
265 }
266 } else {
267 /* No registration request supplied */
268 if (!send_handler)
269 goto error1;
270 }
271
272 /* Validate device and port */
273 port_priv = ib_get_mad_port(device, port_num);
274 if (!port_priv) {
275 ret = ERR_PTR(-ENODEV);
276 goto error1;
277 }
278
279 /* Verify the QP requested is supported. For example, Ethernet devices
280 * will not have QP0 */
281 if (!port_priv->qp_info[qpn].qp) {
282 ret = ERR_PTR(-EPROTONOSUPPORT);
283 goto error1;
284 }
285
286 /* Allocate structures */
287 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
288 if (!mad_agent_priv) {
289 ret = ERR_PTR(-ENOMEM);
290 goto error1;
291 }
292
293 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
294 IB_ACCESS_LOCAL_WRITE);
295 if (IS_ERR(mad_agent_priv->agent.mr)) {
296 ret = ERR_PTR(-ENOMEM);
297 goto error2;
298 }
299
300 if (mad_reg_req) {
301 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
302 if (!reg_req) {
303 ret = ERR_PTR(-ENOMEM);
304 goto error3;
305 }
306 }
307
308 /* Now, fill in the various structures */
309 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
310 mad_agent_priv->reg_req = reg_req;
311 mad_agent_priv->agent.rmpp_version = rmpp_version;
312 mad_agent_priv->agent.device = device;
313 mad_agent_priv->agent.recv_handler = recv_handler;
314 mad_agent_priv->agent.send_handler = send_handler;
315 mad_agent_priv->agent.context = context;
316 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
317 mad_agent_priv->agent.port_num = port_num;
318 spin_lock_init(&mad_agent_priv->lock);
319 INIT_LIST_HEAD(&mad_agent_priv->send_list);
320 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
321 INIT_LIST_HEAD(&mad_agent_priv->done_list);
322 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
323 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
324 INIT_LIST_HEAD(&mad_agent_priv->local_list);
325 INIT_WORK(&mad_agent_priv->local_work, local_completions);
326 atomic_set(&mad_agent_priv->refcount, 1);
327 init_completion(&mad_agent_priv->comp);
328
329 spin_lock_irqsave(&port_priv->reg_lock, flags);
330 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
331
332 /*
333 * Make sure MAD registration (if supplied)
334 * is non overlapping with any existing ones
335 */
336 if (mad_reg_req) {
337 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
338 if (!is_vendor_class(mgmt_class)) {
339 class = port_priv->version[mad_reg_req->
340 mgmt_class_version].class;
341 if (class) {
342 method = class->method_table[mgmt_class];
343 if (method) {
344 if (method_in_use(&method,
345 mad_reg_req))
346 goto error4;
347 }
348 }
349 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
350 mgmt_class);
351 } else {
352 /* "New" vendor class range */
353 vendor = port_priv->version[mad_reg_req->
354 mgmt_class_version].vendor;
355 if (vendor) {
356 vclass = vendor_class_index(mgmt_class);
357 vendor_class = vendor->vendor_class[vclass];
358 if (vendor_class) {
359 if (is_vendor_method_in_use(
360 vendor_class,
361 mad_reg_req))
362 goto error4;
363 }
364 }
365 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
366 }
367 if (ret2) {
368 ret = ERR_PTR(ret2);
369 goto error4;
370 }
371 }
372
373 /* Add mad agent into port's agent list */
374 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
375 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
376
377 return &mad_agent_priv->agent;
378
379 error4:
380 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
381 kfree(reg_req);
382 error3:
383 ib_dereg_mr(mad_agent_priv->agent.mr);
384 error2:
385 kfree(mad_agent_priv);
386 error1:
387 return ret;
388 }
389 EXPORT_SYMBOL(ib_register_mad_agent);
390
391 static inline int is_snooping_sends(int mad_snoop_flags)
392 {
393 return (mad_snoop_flags &
394 (/*IB_MAD_SNOOP_POSTED_SENDS |
395 IB_MAD_SNOOP_RMPP_SENDS |*/
396 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
397 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
398 }
399
400 static inline int is_snooping_recvs(int mad_snoop_flags)
401 {
402 return (mad_snoop_flags &
403 (IB_MAD_SNOOP_RECVS /*|
404 IB_MAD_SNOOP_RMPP_RECVS*/));
405 }
406
407 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
408 struct ib_mad_snoop_private *mad_snoop_priv)
409 {
410 struct ib_mad_snoop_private **new_snoop_table;
411 unsigned long flags;
412 int i;
413
414 spin_lock_irqsave(&qp_info->snoop_lock, flags);
415 /* Check for empty slot in array. */
416 for (i = 0; i < qp_info->snoop_table_size; i++)
417 if (!qp_info->snoop_table[i])
418 break;
419
420 if (i == qp_info->snoop_table_size) {
421 /* Grow table. */
422 new_snoop_table = krealloc(qp_info->snoop_table,
423 sizeof mad_snoop_priv *
424 (qp_info->snoop_table_size + 1),
425 GFP_ATOMIC);
426 if (!new_snoop_table) {
427 i = -ENOMEM;
428 goto out;
429 }
430
431 qp_info->snoop_table = new_snoop_table;
432 qp_info->snoop_table_size++;
433 }
434 qp_info->snoop_table[i] = mad_snoop_priv;
435 atomic_inc(&qp_info->snoop_count);
436 out:
437 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
438 return i;
439 }
440
441 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
442 u8 port_num,
443 enum ib_qp_type qp_type,
444 int mad_snoop_flags,
445 ib_mad_snoop_handler snoop_handler,
446 ib_mad_recv_handler recv_handler,
447 void *context)
448 {
449 struct ib_mad_port_private *port_priv;
450 struct ib_mad_agent *ret;
451 struct ib_mad_snoop_private *mad_snoop_priv;
452 int qpn;
453
454 /* Validate parameters */
455 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
456 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
457 ret = ERR_PTR(-EINVAL);
458 goto error1;
459 }
460 qpn = get_spl_qp_index(qp_type);
461 if (qpn == -1) {
462 ret = ERR_PTR(-EINVAL);
463 goto error1;
464 }
465 port_priv = ib_get_mad_port(device, port_num);
466 if (!port_priv) {
467 ret = ERR_PTR(-ENODEV);
468 goto error1;
469 }
470 /* Allocate structures */
471 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
472 if (!mad_snoop_priv) {
473 ret = ERR_PTR(-ENOMEM);
474 goto error1;
475 }
476
477 /* Now, fill in the various structures */
478 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
479 mad_snoop_priv->agent.device = device;
480 mad_snoop_priv->agent.recv_handler = recv_handler;
481 mad_snoop_priv->agent.snoop_handler = snoop_handler;
482 mad_snoop_priv->agent.context = context;
483 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
484 mad_snoop_priv->agent.port_num = port_num;
485 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
486 init_completion(&mad_snoop_priv->comp);
487 mad_snoop_priv->snoop_index = register_snoop_agent(
488 &port_priv->qp_info[qpn],
489 mad_snoop_priv);
490 if (mad_snoop_priv->snoop_index < 0) {
491 ret = ERR_PTR(mad_snoop_priv->snoop_index);
492 goto error2;
493 }
494
495 atomic_set(&mad_snoop_priv->refcount, 1);
496 return &mad_snoop_priv->agent;
497
498 error2:
499 kfree(mad_snoop_priv);
500 error1:
501 return ret;
502 }
503 EXPORT_SYMBOL(ib_register_mad_snoop);
504
505 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
506 {
507 if (atomic_dec_and_test(&mad_agent_priv->refcount))
508 complete(&mad_agent_priv->comp);
509 }
510
511 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
512 {
513 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
514 complete(&mad_snoop_priv->comp);
515 }
516
517 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
518 {
519 struct ib_mad_port_private *port_priv;
520 unsigned long flags;
521
522 /* Note that we could still be handling received MADs */
523
524 /*
525 * Canceling all sends results in dropping received response
526 * MADs, preventing us from queuing additional work
527 */
528 cancel_mads(mad_agent_priv);
529 port_priv = mad_agent_priv->qp_info->port_priv;
530 cancel_delayed_work(&mad_agent_priv->timed_work);
531
532 spin_lock_irqsave(&port_priv->reg_lock, flags);
533 remove_mad_reg_req(mad_agent_priv);
534 list_del(&mad_agent_priv->agent_list);
535 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
536
537 flush_workqueue(port_priv->wq);
538 ib_cancel_rmpp_recvs(mad_agent_priv);
539
540 deref_mad_agent(mad_agent_priv);
541 wait_for_completion(&mad_agent_priv->comp);
542
543 kfree(mad_agent_priv->reg_req);
544 ib_dereg_mr(mad_agent_priv->agent.mr);
545 kfree(mad_agent_priv);
546 }
547
548 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
549 {
550 struct ib_mad_qp_info *qp_info;
551 unsigned long flags;
552
553 qp_info = mad_snoop_priv->qp_info;
554 spin_lock_irqsave(&qp_info->snoop_lock, flags);
555 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
556 atomic_dec(&qp_info->snoop_count);
557 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
558
559 deref_snoop_agent(mad_snoop_priv);
560 wait_for_completion(&mad_snoop_priv->comp);
561
562 kfree(mad_snoop_priv);
563 }
564
565 /*
566 * ib_unregister_mad_agent - Unregisters a client from using MAD services
567 */
568 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
569 {
570 struct ib_mad_agent_private *mad_agent_priv;
571 struct ib_mad_snoop_private *mad_snoop_priv;
572
573 /* If the TID is zero, the agent can only snoop. */
574 if (mad_agent->hi_tid) {
575 mad_agent_priv = container_of(mad_agent,
576 struct ib_mad_agent_private,
577 agent);
578 unregister_mad_agent(mad_agent_priv);
579 } else {
580 mad_snoop_priv = container_of(mad_agent,
581 struct ib_mad_snoop_private,
582 agent);
583 unregister_mad_snoop(mad_snoop_priv);
584 }
585 return 0;
586 }
587 EXPORT_SYMBOL(ib_unregister_mad_agent);
588
589 static void dequeue_mad(struct ib_mad_list_head *mad_list)
590 {
591 struct ib_mad_queue *mad_queue;
592 unsigned long flags;
593
594 BUG_ON(!mad_list->mad_queue);
595 mad_queue = mad_list->mad_queue;
596 spin_lock_irqsave(&mad_queue->lock, flags);
597 list_del(&mad_list->list);
598 mad_queue->count--;
599 spin_unlock_irqrestore(&mad_queue->lock, flags);
600 }
601
602 static void snoop_send(struct ib_mad_qp_info *qp_info,
603 struct ib_mad_send_buf *send_buf,
604 struct ib_mad_send_wc *mad_send_wc,
605 int mad_snoop_flags)
606 {
607 struct ib_mad_snoop_private *mad_snoop_priv;
608 unsigned long flags;
609 int i;
610
611 spin_lock_irqsave(&qp_info->snoop_lock, flags);
612 for (i = 0; i < qp_info->snoop_table_size; i++) {
613 mad_snoop_priv = qp_info->snoop_table[i];
614 if (!mad_snoop_priv ||
615 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
616 continue;
617
618 atomic_inc(&mad_snoop_priv->refcount);
619 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
620 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
621 send_buf, mad_send_wc);
622 deref_snoop_agent(mad_snoop_priv);
623 spin_lock_irqsave(&qp_info->snoop_lock, flags);
624 }
625 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
626 }
627
628 static void snoop_recv(struct ib_mad_qp_info *qp_info,
629 struct ib_mad_recv_wc *mad_recv_wc,
630 int mad_snoop_flags)
631 {
632 struct ib_mad_snoop_private *mad_snoop_priv;
633 unsigned long flags;
634 int i;
635
636 spin_lock_irqsave(&qp_info->snoop_lock, flags);
637 for (i = 0; i < qp_info->snoop_table_size; i++) {
638 mad_snoop_priv = qp_info->snoop_table[i];
639 if (!mad_snoop_priv ||
640 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
641 continue;
642
643 atomic_inc(&mad_snoop_priv->refcount);
644 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
645 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
646 mad_recv_wc);
647 deref_snoop_agent(mad_snoop_priv);
648 spin_lock_irqsave(&qp_info->snoop_lock, flags);
649 }
650 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
651 }
652
653 static void build_smp_wc(struct ib_qp *qp,
654 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
655 struct ib_wc *wc)
656 {
657 memset(wc, 0, sizeof *wc);
658 wc->wr_id = wr_id;
659 wc->status = IB_WC_SUCCESS;
660 wc->opcode = IB_WC_RECV;
661 wc->pkey_index = pkey_index;
662 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
663 wc->src_qp = IB_QP0;
664 wc->qp = qp;
665 wc->slid = slid;
666 wc->sl = 0;
667 wc->dlid_path_bits = 0;
668 wc->port_num = port_num;
669 }
670
671 /*
672 * Return 0 if SMP is to be sent
673 * Return 1 if SMP was consumed locally (whether or not solicited)
674 * Return < 0 if error
675 */
676 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
677 struct ib_mad_send_wr_private *mad_send_wr)
678 {
679 int ret = 0;
680 struct ib_smp *smp = mad_send_wr->send_buf.mad;
681 unsigned long flags;
682 struct ib_mad_local_private *local;
683 struct ib_mad_private *mad_priv;
684 struct ib_mad_port_private *port_priv;
685 struct ib_mad_agent_private *recv_mad_agent = NULL;
686 struct ib_device *device = mad_agent_priv->agent.device;
687 u8 port_num;
688 struct ib_wc mad_wc;
689 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
690
691 if (device->node_type == RDMA_NODE_IB_SWITCH &&
692 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
693 port_num = send_wr->wr.ud.port_num;
694 else
695 port_num = mad_agent_priv->agent.port_num;
696
697 /*
698 * Directed route handling starts if the initial LID routed part of
699 * a request or the ending LID routed part of a response is empty.
700 * If we are at the start of the LID routed part, don't update the
701 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
702 */
703 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
704 IB_LID_PERMISSIVE &&
705 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
706 IB_SMI_DISCARD) {
707 ret = -EINVAL;
708 printk(KERN_ERR PFX "Invalid directed route\n");
709 goto out;
710 }
711
712 /* Check to post send on QP or process locally */
713 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
714 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
715 goto out;
716
717 local = kmalloc(sizeof *local, GFP_ATOMIC);
718 if (!local) {
719 ret = -ENOMEM;
720 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
721 goto out;
722 }
723 local->mad_priv = NULL;
724 local->recv_mad_agent = NULL;
725 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
726 if (!mad_priv) {
727 ret = -ENOMEM;
728 printk(KERN_ERR PFX "No memory for local response MAD\n");
729 kfree(local);
730 goto out;
731 }
732
733 build_smp_wc(mad_agent_priv->agent.qp,
734 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
735 send_wr->wr.ud.pkey_index,
736 send_wr->wr.ud.port_num, &mad_wc);
737
738 /* No GRH for DR SMP */
739 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
740 (struct ib_mad *)smp,
741 (struct ib_mad *)&mad_priv->mad);
742 switch (ret)
743 {
744 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
745 if (ib_response_mad(&mad_priv->mad.mad) &&
746 mad_agent_priv->agent.recv_handler) {
747 local->mad_priv = mad_priv;
748 local->recv_mad_agent = mad_agent_priv;
749 /*
750 * Reference MAD agent until receive
751 * side of local completion handled
752 */
753 atomic_inc(&mad_agent_priv->refcount);
754 } else
755 kmem_cache_free(ib_mad_cache, mad_priv);
756 break;
757 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
758 kmem_cache_free(ib_mad_cache, mad_priv);
759 break;
760 case IB_MAD_RESULT_SUCCESS:
761 /* Treat like an incoming receive MAD */
762 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
763 mad_agent_priv->agent.port_num);
764 if (port_priv) {
765 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
766 recv_mad_agent = find_mad_agent(port_priv,
767 &mad_priv->mad.mad);
768 }
769 if (!port_priv || !recv_mad_agent) {
770 /*
771 * No receiving agent so drop packet and
772 * generate send completion.
773 */
774 kmem_cache_free(ib_mad_cache, mad_priv);
775 break;
776 }
777 local->mad_priv = mad_priv;
778 local->recv_mad_agent = recv_mad_agent;
779 break;
780 default:
781 kmem_cache_free(ib_mad_cache, mad_priv);
782 kfree(local);
783 ret = -EINVAL;
784 goto out;
785 }
786
787 local->mad_send_wr = mad_send_wr;
788 /* Reference MAD agent until send side of local completion handled */
789 atomic_inc(&mad_agent_priv->refcount);
790 /* Queue local completion to local list */
791 spin_lock_irqsave(&mad_agent_priv->lock, flags);
792 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
793 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
794 queue_work(mad_agent_priv->qp_info->port_priv->wq,
795 &mad_agent_priv->local_work);
796 ret = 1;
797 out:
798 return ret;
799 }
800
801 static int get_pad_size(int hdr_len, int data_len)
802 {
803 int seg_size, pad;
804
805 seg_size = sizeof(struct ib_mad) - hdr_len;
806 if (data_len && seg_size) {
807 pad = seg_size - data_len % seg_size;
808 return pad == seg_size ? 0 : pad;
809 } else
810 return seg_size;
811 }
812
813 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
814 {
815 struct ib_rmpp_segment *s, *t;
816
817 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
818 list_del(&s->list);
819 kfree(s);
820 }
821 }
822
823 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
824 gfp_t gfp_mask)
825 {
826 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
827 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
828 struct ib_rmpp_segment *seg = NULL;
829 int left, seg_size, pad;
830
831 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
832 seg_size = send_buf->seg_size;
833 pad = send_wr->pad;
834
835 /* Allocate data segments. */
836 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
837 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
838 if (!seg) {
839 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
840 "alloc failed for len %zd, gfp %#x\n",
841 sizeof (*seg) + seg_size, gfp_mask);
842 free_send_rmpp_list(send_wr);
843 return -ENOMEM;
844 }
845 seg->num = ++send_buf->seg_count;
846 list_add_tail(&seg->list, &send_wr->rmpp_list);
847 }
848
849 /* Zero any padding */
850 if (pad)
851 memset(seg->data + seg_size - pad, 0, pad);
852
853 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
854 agent.rmpp_version;
855 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
856 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
857
858 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
859 struct ib_rmpp_segment, list);
860 send_wr->last_ack_seg = send_wr->cur_seg;
861 return 0;
862 }
863
864 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
865 u32 remote_qpn, u16 pkey_index,
866 int rmpp_active,
867 int hdr_len, int data_len,
868 gfp_t gfp_mask)
869 {
870 struct ib_mad_agent_private *mad_agent_priv;
871 struct ib_mad_send_wr_private *mad_send_wr;
872 int pad, message_size, ret, size;
873 void *buf;
874
875 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
876 agent);
877 pad = get_pad_size(hdr_len, data_len);
878 message_size = hdr_len + data_len + pad;
879
880 if ((!mad_agent->rmpp_version &&
881 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
882 (!rmpp_active && message_size > sizeof(struct ib_mad)))
883 return ERR_PTR(-EINVAL);
884
885 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
886 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
887 if (!buf)
888 return ERR_PTR(-ENOMEM);
889
890 mad_send_wr = buf + size;
891 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
892 mad_send_wr->send_buf.mad = buf;
893 mad_send_wr->send_buf.hdr_len = hdr_len;
894 mad_send_wr->send_buf.data_len = data_len;
895 mad_send_wr->pad = pad;
896
897 mad_send_wr->mad_agent_priv = mad_agent_priv;
898 mad_send_wr->sg_list[0].length = hdr_len;
899 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
900 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
901 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
902
903 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
904 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
905 mad_send_wr->send_wr.num_sge = 2;
906 mad_send_wr->send_wr.opcode = IB_WR_SEND;
907 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
908 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
909 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
910 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
911
912 if (rmpp_active) {
913 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
914 if (ret) {
915 kfree(buf);
916 return ERR_PTR(ret);
917 }
918 }
919
920 mad_send_wr->send_buf.mad_agent = mad_agent;
921 atomic_inc(&mad_agent_priv->refcount);
922 return &mad_send_wr->send_buf;
923 }
924 EXPORT_SYMBOL(ib_create_send_mad);
925
926 int ib_get_mad_data_offset(u8 mgmt_class)
927 {
928 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
929 return IB_MGMT_SA_HDR;
930 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
931 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
932 (mgmt_class == IB_MGMT_CLASS_BIS))
933 return IB_MGMT_DEVICE_HDR;
934 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
935 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
936 return IB_MGMT_VENDOR_HDR;
937 else
938 return IB_MGMT_MAD_HDR;
939 }
940 EXPORT_SYMBOL(ib_get_mad_data_offset);
941
942 int ib_is_mad_class_rmpp(u8 mgmt_class)
943 {
944 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
945 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
946 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
947 (mgmt_class == IB_MGMT_CLASS_BIS) ||
948 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
949 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
950 return 1;
951 return 0;
952 }
953 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
954
955 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
956 {
957 struct ib_mad_send_wr_private *mad_send_wr;
958 struct list_head *list;
959
960 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
961 send_buf);
962 list = &mad_send_wr->cur_seg->list;
963
964 if (mad_send_wr->cur_seg->num < seg_num) {
965 list_for_each_entry(mad_send_wr->cur_seg, list, list)
966 if (mad_send_wr->cur_seg->num == seg_num)
967 break;
968 } else if (mad_send_wr->cur_seg->num > seg_num) {
969 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
970 if (mad_send_wr->cur_seg->num == seg_num)
971 break;
972 }
973 return mad_send_wr->cur_seg->data;
974 }
975 EXPORT_SYMBOL(ib_get_rmpp_segment);
976
977 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
978 {
979 if (mad_send_wr->send_buf.seg_count)
980 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
981 mad_send_wr->seg_num);
982 else
983 return mad_send_wr->send_buf.mad +
984 mad_send_wr->send_buf.hdr_len;
985 }
986
987 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
988 {
989 struct ib_mad_agent_private *mad_agent_priv;
990 struct ib_mad_send_wr_private *mad_send_wr;
991
992 mad_agent_priv = container_of(send_buf->mad_agent,
993 struct ib_mad_agent_private, agent);
994 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
995 send_buf);
996
997 free_send_rmpp_list(mad_send_wr);
998 kfree(send_buf->mad);
999 deref_mad_agent(mad_agent_priv);
1000 }
1001 EXPORT_SYMBOL(ib_free_send_mad);
1002
1003 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1004 {
1005 struct ib_mad_qp_info *qp_info;
1006 struct list_head *list;
1007 struct ib_send_wr *bad_send_wr;
1008 struct ib_mad_agent *mad_agent;
1009 struct ib_sge *sge;
1010 unsigned long flags;
1011 int ret;
1012
1013 /* Set WR ID to find mad_send_wr upon completion */
1014 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1015 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1016 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1017
1018 mad_agent = mad_send_wr->send_buf.mad_agent;
1019 sge = mad_send_wr->sg_list;
1020 sge[0].addr = ib_dma_map_single(mad_agent->device,
1021 mad_send_wr->send_buf.mad,
1022 sge[0].length,
1023 DMA_TO_DEVICE);
1024 mad_send_wr->header_mapping = sge[0].addr;
1025
1026 sge[1].addr = ib_dma_map_single(mad_agent->device,
1027 ib_get_payload(mad_send_wr),
1028 sge[1].length,
1029 DMA_TO_DEVICE);
1030 mad_send_wr->payload_mapping = sge[1].addr;
1031
1032 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1033 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1034 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1035 &bad_send_wr);
1036 list = &qp_info->send_queue.list;
1037 } else {
1038 ret = 0;
1039 list = &qp_info->overflow_list;
1040 }
1041
1042 if (!ret) {
1043 qp_info->send_queue.count++;
1044 list_add_tail(&mad_send_wr->mad_list.list, list);
1045 }
1046 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1047 if (ret) {
1048 ib_dma_unmap_single(mad_agent->device,
1049 mad_send_wr->header_mapping,
1050 sge[0].length, DMA_TO_DEVICE);
1051 ib_dma_unmap_single(mad_agent->device,
1052 mad_send_wr->payload_mapping,
1053 sge[1].length, DMA_TO_DEVICE);
1054 }
1055 return ret;
1056 }
1057
1058 /*
1059 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1060 * with the registered client
1061 */
1062 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1063 struct ib_mad_send_buf **bad_send_buf)
1064 {
1065 struct ib_mad_agent_private *mad_agent_priv;
1066 struct ib_mad_send_buf *next_send_buf;
1067 struct ib_mad_send_wr_private *mad_send_wr;
1068 unsigned long flags;
1069 int ret = -EINVAL;
1070
1071 /* Walk list of send WRs and post each on send list */
1072 for (; send_buf; send_buf = next_send_buf) {
1073
1074 mad_send_wr = container_of(send_buf,
1075 struct ib_mad_send_wr_private,
1076 send_buf);
1077 mad_agent_priv = mad_send_wr->mad_agent_priv;
1078
1079 if (!send_buf->mad_agent->send_handler ||
1080 (send_buf->timeout_ms &&
1081 !send_buf->mad_agent->recv_handler)) {
1082 ret = -EINVAL;
1083 goto error;
1084 }
1085
1086 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1087 if (mad_agent_priv->agent.rmpp_version) {
1088 ret = -EINVAL;
1089 goto error;
1090 }
1091 }
1092
1093 /*
1094 * Save pointer to next work request to post in case the
1095 * current one completes, and the user modifies the work
1096 * request associated with the completion
1097 */
1098 next_send_buf = send_buf->next;
1099 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1100
1101 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1102 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1103 ret = handle_outgoing_dr_smp(mad_agent_priv,
1104 mad_send_wr);
1105 if (ret < 0) /* error */
1106 goto error;
1107 else if (ret == 1) /* locally consumed */
1108 continue;
1109 }
1110
1111 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1112 /* Timeout will be updated after send completes */
1113 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1114 mad_send_wr->max_retries = send_buf->retries;
1115 mad_send_wr->retries_left = send_buf->retries;
1116 send_buf->retries = 0;
1117 /* Reference for work request to QP + response */
1118 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1119 mad_send_wr->status = IB_WC_SUCCESS;
1120
1121 /* Reference MAD agent until send completes */
1122 atomic_inc(&mad_agent_priv->refcount);
1123 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1124 list_add_tail(&mad_send_wr->agent_list,
1125 &mad_agent_priv->send_list);
1126 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1127
1128 if (mad_agent_priv->agent.rmpp_version) {
1129 ret = ib_send_rmpp_mad(mad_send_wr);
1130 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1131 ret = ib_send_mad(mad_send_wr);
1132 } else
1133 ret = ib_send_mad(mad_send_wr);
1134 if (ret < 0) {
1135 /* Fail send request */
1136 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1137 list_del(&mad_send_wr->agent_list);
1138 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1139 atomic_dec(&mad_agent_priv->refcount);
1140 goto error;
1141 }
1142 }
1143 return 0;
1144 error:
1145 if (bad_send_buf)
1146 *bad_send_buf = send_buf;
1147 return ret;
1148 }
1149 EXPORT_SYMBOL(ib_post_send_mad);
1150
1151 /*
1152 * ib_free_recv_mad - Returns data buffers used to receive
1153 * a MAD to the access layer
1154 */
1155 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1156 {
1157 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1158 struct ib_mad_private_header *mad_priv_hdr;
1159 struct ib_mad_private *priv;
1160 struct list_head free_list;
1161
1162 INIT_LIST_HEAD(&free_list);
1163 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1164
1165 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1166 &free_list, list) {
1167 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1168 recv_buf);
1169 mad_priv_hdr = container_of(mad_recv_wc,
1170 struct ib_mad_private_header,
1171 recv_wc);
1172 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1173 header);
1174 kmem_cache_free(ib_mad_cache, priv);
1175 }
1176 }
1177 EXPORT_SYMBOL(ib_free_recv_mad);
1178
1179 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1180 u8 rmpp_version,
1181 ib_mad_send_handler send_handler,
1182 ib_mad_recv_handler recv_handler,
1183 void *context)
1184 {
1185 return ERR_PTR(-EINVAL); /* XXX: for now */
1186 }
1187 EXPORT_SYMBOL(ib_redirect_mad_qp);
1188
1189 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1190 struct ib_wc *wc)
1191 {
1192 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1193 return 0;
1194 }
1195 EXPORT_SYMBOL(ib_process_mad_wc);
1196
1197 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1198 struct ib_mad_reg_req *mad_reg_req)
1199 {
1200 int i;
1201
1202 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1203 if ((*method)->agent[i]) {
1204 printk(KERN_ERR PFX "Method %d already in use\n", i);
1205 return -EINVAL;
1206 }
1207 }
1208 return 0;
1209 }
1210
1211 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1212 {
1213 /* Allocate management method table */
1214 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1215 if (!*method) {
1216 printk(KERN_ERR PFX "No memory for "
1217 "ib_mad_mgmt_method_table\n");
1218 return -ENOMEM;
1219 }
1220
1221 return 0;
1222 }
1223
1224 /*
1225 * Check to see if there are any methods still in use
1226 */
1227 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1228 {
1229 int i;
1230
1231 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1232 if (method->agent[i])
1233 return 1;
1234 return 0;
1235 }
1236
1237 /*
1238 * Check to see if there are any method tables for this class still in use
1239 */
1240 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1241 {
1242 int i;
1243
1244 for (i = 0; i < MAX_MGMT_CLASS; i++)
1245 if (class->method_table[i])
1246 return 1;
1247 return 0;
1248 }
1249
1250 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1251 {
1252 int i;
1253
1254 for (i = 0; i < MAX_MGMT_OUI; i++)
1255 if (vendor_class->method_table[i])
1256 return 1;
1257 return 0;
1258 }
1259
1260 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1261 char *oui)
1262 {
1263 int i;
1264
1265 for (i = 0; i < MAX_MGMT_OUI; i++)
1266 /* Is there matching OUI for this vendor class ? */
1267 if (!memcmp(vendor_class->oui[i], oui, 3))
1268 return i;
1269
1270 return -1;
1271 }
1272
1273 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1274 {
1275 int i;
1276
1277 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1278 if (vendor->vendor_class[i])
1279 return 1;
1280
1281 return 0;
1282 }
1283
1284 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1285 struct ib_mad_agent_private *agent)
1286 {
1287 int i;
1288
1289 /* Remove any methods for this mad agent */
1290 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1291 if (method->agent[i] == agent) {
1292 method->agent[i] = NULL;
1293 }
1294 }
1295 }
1296
1297 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1298 struct ib_mad_agent_private *agent_priv,
1299 u8 mgmt_class)
1300 {
1301 struct ib_mad_port_private *port_priv;
1302 struct ib_mad_mgmt_class_table **class;
1303 struct ib_mad_mgmt_method_table **method;
1304 int i, ret;
1305
1306 port_priv = agent_priv->qp_info->port_priv;
1307 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1308 if (!*class) {
1309 /* Allocate management class table for "new" class version */
1310 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1311 if (!*class) {
1312 printk(KERN_ERR PFX "No memory for "
1313 "ib_mad_mgmt_class_table\n");
1314 ret = -ENOMEM;
1315 goto error1;
1316 }
1317
1318 /* Allocate method table for this management class */
1319 method = &(*class)->method_table[mgmt_class];
1320 if ((ret = allocate_method_table(method)))
1321 goto error2;
1322 } else {
1323 method = &(*class)->method_table[mgmt_class];
1324 if (!*method) {
1325 /* Allocate method table for this management class */
1326 if ((ret = allocate_method_table(method)))
1327 goto error1;
1328 }
1329 }
1330
1331 /* Now, make sure methods are not already in use */
1332 if (method_in_use(method, mad_reg_req))
1333 goto error3;
1334
1335 /* Finally, add in methods being registered */
1336 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1337 (*method)->agent[i] = agent_priv;
1338
1339 return 0;
1340
1341 error3:
1342 /* Remove any methods for this mad agent */
1343 remove_methods_mad_agent(*method, agent_priv);
1344 /* Now, check to see if there are any methods in use */
1345 if (!check_method_table(*method)) {
1346 /* If not, release management method table */
1347 kfree(*method);
1348 *method = NULL;
1349 }
1350 ret = -EINVAL;
1351 goto error1;
1352 error2:
1353 kfree(*class);
1354 *class = NULL;
1355 error1:
1356 return ret;
1357 }
1358
1359 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1360 struct ib_mad_agent_private *agent_priv)
1361 {
1362 struct ib_mad_port_private *port_priv;
1363 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1364 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1365 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1366 struct ib_mad_mgmt_method_table **method;
1367 int i, ret = -ENOMEM;
1368 u8 vclass;
1369
1370 /* "New" vendor (with OUI) class */
1371 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1372 port_priv = agent_priv->qp_info->port_priv;
1373 vendor_table = &port_priv->version[
1374 mad_reg_req->mgmt_class_version].vendor;
1375 if (!*vendor_table) {
1376 /* Allocate mgmt vendor class table for "new" class version */
1377 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1378 if (!vendor) {
1379 printk(KERN_ERR PFX "No memory for "
1380 "ib_mad_mgmt_vendor_class_table\n");
1381 goto error1;
1382 }
1383
1384 *vendor_table = vendor;
1385 }
1386 if (!(*vendor_table)->vendor_class[vclass]) {
1387 /* Allocate table for this management vendor class */
1388 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1389 if (!vendor_class) {
1390 printk(KERN_ERR PFX "No memory for "
1391 "ib_mad_mgmt_vendor_class\n");
1392 goto error2;
1393 }
1394
1395 (*vendor_table)->vendor_class[vclass] = vendor_class;
1396 }
1397 for (i = 0; i < MAX_MGMT_OUI; i++) {
1398 /* Is there matching OUI for this vendor class ? */
1399 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1400 mad_reg_req->oui, 3)) {
1401 method = &(*vendor_table)->vendor_class[
1402 vclass]->method_table[i];
1403 BUG_ON(!*method);
1404 goto check_in_use;
1405 }
1406 }
1407 for (i = 0; i < MAX_MGMT_OUI; i++) {
1408 /* OUI slot available ? */
1409 if (!is_vendor_oui((*vendor_table)->vendor_class[
1410 vclass]->oui[i])) {
1411 method = &(*vendor_table)->vendor_class[
1412 vclass]->method_table[i];
1413 BUG_ON(*method);
1414 /* Allocate method table for this OUI */
1415 if ((ret = allocate_method_table(method)))
1416 goto error3;
1417 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1418 mad_reg_req->oui, 3);
1419 goto check_in_use;
1420 }
1421 }
1422 printk(KERN_ERR PFX "All OUI slots in use\n");
1423 goto error3;
1424
1425 check_in_use:
1426 /* Now, make sure methods are not already in use */
1427 if (method_in_use(method, mad_reg_req))
1428 goto error4;
1429
1430 /* Finally, add in methods being registered */
1431 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1432 (*method)->agent[i] = agent_priv;
1433
1434 return 0;
1435
1436 error4:
1437 /* Remove any methods for this mad agent */
1438 remove_methods_mad_agent(*method, agent_priv);
1439 /* Now, check to see if there are any methods in use */
1440 if (!check_method_table(*method)) {
1441 /* If not, release management method table */
1442 kfree(*method);
1443 *method = NULL;
1444 }
1445 ret = -EINVAL;
1446 error3:
1447 if (vendor_class) {
1448 (*vendor_table)->vendor_class[vclass] = NULL;
1449 kfree(vendor_class);
1450 }
1451 error2:
1452 if (vendor) {
1453 *vendor_table = NULL;
1454 kfree(vendor);
1455 }
1456 error1:
1457 return ret;
1458 }
1459
1460 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1461 {
1462 struct ib_mad_port_private *port_priv;
1463 struct ib_mad_mgmt_class_table *class;
1464 struct ib_mad_mgmt_method_table *method;
1465 struct ib_mad_mgmt_vendor_class_table *vendor;
1466 struct ib_mad_mgmt_vendor_class *vendor_class;
1467 int index;
1468 u8 mgmt_class;
1469
1470 /*
1471 * Was MAD registration request supplied
1472 * with original registration ?
1473 */
1474 if (!agent_priv->reg_req) {
1475 goto out;
1476 }
1477
1478 port_priv = agent_priv->qp_info->port_priv;
1479 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1480 class = port_priv->version[
1481 agent_priv->reg_req->mgmt_class_version].class;
1482 if (!class)
1483 goto vendor_check;
1484
1485 method = class->method_table[mgmt_class];
1486 if (method) {
1487 /* Remove any methods for this mad agent */
1488 remove_methods_mad_agent(method, agent_priv);
1489 /* Now, check to see if there are any methods still in use */
1490 if (!check_method_table(method)) {
1491 /* If not, release management method table */
1492 kfree(method);
1493 class->method_table[mgmt_class] = NULL;
1494 /* Any management classes left ? */
1495 if (!check_class_table(class)) {
1496 /* If not, release management class table */
1497 kfree(class);
1498 port_priv->version[
1499 agent_priv->reg_req->
1500 mgmt_class_version].class = NULL;
1501 }
1502 }
1503 }
1504
1505 vendor_check:
1506 if (!is_vendor_class(mgmt_class))
1507 goto out;
1508
1509 /* normalize mgmt_class to vendor range 2 */
1510 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1511 vendor = port_priv->version[
1512 agent_priv->reg_req->mgmt_class_version].vendor;
1513
1514 if (!vendor)
1515 goto out;
1516
1517 vendor_class = vendor->vendor_class[mgmt_class];
1518 if (vendor_class) {
1519 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1520 if (index < 0)
1521 goto out;
1522 method = vendor_class->method_table[index];
1523 if (method) {
1524 /* Remove any methods for this mad agent */
1525 remove_methods_mad_agent(method, agent_priv);
1526 /*
1527 * Now, check to see if there are
1528 * any methods still in use
1529 */
1530 if (!check_method_table(method)) {
1531 /* If not, release management method table */
1532 kfree(method);
1533 vendor_class->method_table[index] = NULL;
1534 memset(vendor_class->oui[index], 0, 3);
1535 /* Any OUIs left ? */
1536 if (!check_vendor_class(vendor_class)) {
1537 /* If not, release vendor class table */
1538 kfree(vendor_class);
1539 vendor->vendor_class[mgmt_class] = NULL;
1540 /* Any other vendor classes left ? */
1541 if (!check_vendor_table(vendor)) {
1542 kfree(vendor);
1543 port_priv->version[
1544 agent_priv->reg_req->
1545 mgmt_class_version].
1546 vendor = NULL;
1547 }
1548 }
1549 }
1550 }
1551 }
1552
1553 out:
1554 return;
1555 }
1556
1557 static struct ib_mad_agent_private *
1558 find_mad_agent(struct ib_mad_port_private *port_priv,
1559 struct ib_mad *mad)
1560 {
1561 struct ib_mad_agent_private *mad_agent = NULL;
1562 unsigned long flags;
1563
1564 spin_lock_irqsave(&port_priv->reg_lock, flags);
1565 if (ib_response_mad(mad)) {
1566 u32 hi_tid;
1567 struct ib_mad_agent_private *entry;
1568
1569 /*
1570 * Routing is based on high 32 bits of transaction ID
1571 * of MAD.
1572 */
1573 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1574 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1575 if (entry->agent.hi_tid == hi_tid) {
1576 mad_agent = entry;
1577 break;
1578 }
1579 }
1580 } else {
1581 struct ib_mad_mgmt_class_table *class;
1582 struct ib_mad_mgmt_method_table *method;
1583 struct ib_mad_mgmt_vendor_class_table *vendor;
1584 struct ib_mad_mgmt_vendor_class *vendor_class;
1585 struct ib_vendor_mad *vendor_mad;
1586 int index;
1587
1588 /*
1589 * Routing is based on version, class, and method
1590 * For "newer" vendor MADs, also based on OUI
1591 */
1592 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1593 goto out;
1594 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1595 class = port_priv->version[
1596 mad->mad_hdr.class_version].class;
1597 if (!class)
1598 goto out;
1599 method = class->method_table[convert_mgmt_class(
1600 mad->mad_hdr.mgmt_class)];
1601 if (method)
1602 mad_agent = method->agent[mad->mad_hdr.method &
1603 ~IB_MGMT_METHOD_RESP];
1604 } else {
1605 vendor = port_priv->version[
1606 mad->mad_hdr.class_version].vendor;
1607 if (!vendor)
1608 goto out;
1609 vendor_class = vendor->vendor_class[vendor_class_index(
1610 mad->mad_hdr.mgmt_class)];
1611 if (!vendor_class)
1612 goto out;
1613 /* Find matching OUI */
1614 vendor_mad = (struct ib_vendor_mad *)mad;
1615 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1616 if (index == -1)
1617 goto out;
1618 method = vendor_class->method_table[index];
1619 if (method) {
1620 mad_agent = method->agent[mad->mad_hdr.method &
1621 ~IB_MGMT_METHOD_RESP];
1622 }
1623 }
1624 }
1625
1626 if (mad_agent) {
1627 if (mad_agent->agent.recv_handler)
1628 atomic_inc(&mad_agent->refcount);
1629 else {
1630 printk(KERN_NOTICE PFX "No receive handler for client "
1631 "%p on port %d\n",
1632 &mad_agent->agent, port_priv->port_num);
1633 mad_agent = NULL;
1634 }
1635 }
1636 out:
1637 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1638
1639 return mad_agent;
1640 }
1641
1642 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1643 {
1644 int valid = 0;
1645
1646 /* Make sure MAD base version is understood */
1647 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1648 printk(KERN_ERR PFX "MAD received with unsupported base "
1649 "version %d\n", mad->mad_hdr.base_version);
1650 goto out;
1651 }
1652
1653 /* Filter SMI packets sent to other than QP0 */
1654 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1655 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1656 if (qp_num == 0)
1657 valid = 1;
1658 } else {
1659 /* Filter GSI packets sent to QP0 */
1660 if (qp_num != 0)
1661 valid = 1;
1662 }
1663
1664 out:
1665 return valid;
1666 }
1667
1668 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1669 struct ib_mad_hdr *mad_hdr)
1670 {
1671 struct ib_rmpp_mad *rmpp_mad;
1672
1673 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1674 return !mad_agent_priv->agent.rmpp_version ||
1675 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1676 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1677 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1678 }
1679
1680 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1681 struct ib_mad_recv_wc *rwc)
1682 {
1683 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1684 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1685 }
1686
1687 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1688 struct ib_mad_send_wr_private *wr,
1689 struct ib_mad_recv_wc *rwc )
1690 {
1691 struct ib_ah_attr attr;
1692 u8 send_resp, rcv_resp;
1693 union ib_gid sgid;
1694 struct ib_device *device = mad_agent_priv->agent.device;
1695 u8 port_num = mad_agent_priv->agent.port_num;
1696 u8 lmc;
1697
1698 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1699 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1700
1701 if (send_resp == rcv_resp)
1702 /* both requests, or both responses. GIDs different */
1703 return 0;
1704
1705 if (ib_query_ah(wr->send_buf.ah, &attr))
1706 /* Assume not equal, to avoid false positives. */
1707 return 0;
1708
1709 if (!!(attr.ah_flags & IB_AH_GRH) !=
1710 !!(rwc->wc->wc_flags & IB_WC_GRH))
1711 /* one has GID, other does not. Assume different */
1712 return 0;
1713
1714 if (!send_resp && rcv_resp) {
1715 /* is request/response. */
1716 if (!(attr.ah_flags & IB_AH_GRH)) {
1717 if (ib_get_cached_lmc(device, port_num, &lmc))
1718 return 0;
1719 return (!lmc || !((attr.src_path_bits ^
1720 rwc->wc->dlid_path_bits) &
1721 ((1 << lmc) - 1)));
1722 } else {
1723 if (ib_get_cached_gid(device, port_num,
1724 attr.grh.sgid_index, &sgid))
1725 return 0;
1726 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1727 16);
1728 }
1729 }
1730
1731 if (!(attr.ah_flags & IB_AH_GRH))
1732 return attr.dlid == rwc->wc->slid;
1733 else
1734 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1735 16);
1736 }
1737
1738 static inline int is_direct(u8 class)
1739 {
1740 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1741 }
1742
1743 struct ib_mad_send_wr_private*
1744 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1745 struct ib_mad_recv_wc *wc)
1746 {
1747 struct ib_mad_send_wr_private *wr;
1748 struct ib_mad *mad;
1749
1750 mad = (struct ib_mad *)wc->recv_buf.mad;
1751
1752 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1753 if ((wr->tid == mad->mad_hdr.tid) &&
1754 rcv_has_same_class(wr, wc) &&
1755 /*
1756 * Don't check GID for direct routed MADs.
1757 * These might have permissive LIDs.
1758 */
1759 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1760 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1761 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1762 }
1763
1764 /*
1765 * It's possible to receive the response before we've
1766 * been notified that the send has completed
1767 */
1768 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1769 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1770 wr->tid == mad->mad_hdr.tid &&
1771 wr->timeout &&
1772 rcv_has_same_class(wr, wc) &&
1773 /*
1774 * Don't check GID for direct routed MADs.
1775 * These might have permissive LIDs.
1776 */
1777 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1778 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1779 /* Verify request has not been canceled */
1780 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1781 }
1782 return NULL;
1783 }
1784
1785 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1786 {
1787 mad_send_wr->timeout = 0;
1788 if (mad_send_wr->refcount == 1)
1789 list_move_tail(&mad_send_wr->agent_list,
1790 &mad_send_wr->mad_agent_priv->done_list);
1791 }
1792
1793 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1794 struct ib_mad_recv_wc *mad_recv_wc)
1795 {
1796 struct ib_mad_send_wr_private *mad_send_wr;
1797 struct ib_mad_send_wc mad_send_wc;
1798 unsigned long flags;
1799
1800 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1801 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1802 if (mad_agent_priv->agent.rmpp_version) {
1803 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1804 mad_recv_wc);
1805 if (!mad_recv_wc) {
1806 deref_mad_agent(mad_agent_priv);
1807 return;
1808 }
1809 }
1810
1811 /* Complete corresponding request */
1812 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1813 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1814 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1815 if (!mad_send_wr) {
1816 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1817 ib_free_recv_mad(mad_recv_wc);
1818 deref_mad_agent(mad_agent_priv);
1819 return;
1820 }
1821 ib_mark_mad_done(mad_send_wr);
1822 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1823
1824 /* Defined behavior is to complete response before request */
1825 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1826 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1827 mad_recv_wc);
1828 atomic_dec(&mad_agent_priv->refcount);
1829
1830 mad_send_wc.status = IB_WC_SUCCESS;
1831 mad_send_wc.vendor_err = 0;
1832 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1833 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1834 } else {
1835 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1836 mad_recv_wc);
1837 deref_mad_agent(mad_agent_priv);
1838 }
1839 }
1840
1841 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1842 struct ib_wc *wc)
1843 {
1844 struct ib_mad_qp_info *qp_info;
1845 struct ib_mad_private_header *mad_priv_hdr;
1846 struct ib_mad_private *recv, *response = NULL;
1847 struct ib_mad_list_head *mad_list;
1848 struct ib_mad_agent_private *mad_agent;
1849 int port_num;
1850
1851 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1852 qp_info = mad_list->mad_queue->qp_info;
1853 dequeue_mad(mad_list);
1854
1855 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1856 mad_list);
1857 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1858 ib_dma_unmap_single(port_priv->device,
1859 recv->header.mapping,
1860 sizeof(struct ib_mad_private) -
1861 sizeof(struct ib_mad_private_header),
1862 DMA_FROM_DEVICE);
1863
1864 /* Setup MAD receive work completion from "normal" work completion */
1865 recv->header.wc = *wc;
1866 recv->header.recv_wc.wc = &recv->header.wc;
1867 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1868 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1869 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1870
1871 if (atomic_read(&qp_info->snoop_count))
1872 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1873
1874 /* Validate MAD */
1875 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1876 goto out;
1877
1878 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1879 if (!response) {
1880 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1881 "for response buffer\n");
1882 goto out;
1883 }
1884
1885 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1886 port_num = wc->port_num;
1887 else
1888 port_num = port_priv->port_num;
1889
1890 if (recv->mad.mad.mad_hdr.mgmt_class ==
1891 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1892 enum smi_forward_action retsmi;
1893
1894 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1895 port_priv->device->node_type,
1896 port_num,
1897 port_priv->device->phys_port_cnt) ==
1898 IB_SMI_DISCARD)
1899 goto out;
1900
1901 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1902 if (retsmi == IB_SMI_LOCAL)
1903 goto local;
1904
1905 if (retsmi == IB_SMI_SEND) { /* don't forward */
1906 if (smi_handle_dr_smp_send(&recv->mad.smp,
1907 port_priv->device->node_type,
1908 port_num) == IB_SMI_DISCARD)
1909 goto out;
1910
1911 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1912 goto out;
1913 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1914 /* forward case for switches */
1915 memcpy(response, recv, sizeof(*response));
1916 response->header.recv_wc.wc = &response->header.wc;
1917 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1918 response->header.recv_wc.recv_buf.grh = &response->grh;
1919
1920 agent_send_response(&response->mad.mad,
1921 &response->grh, wc,
1922 port_priv->device,
1923 smi_get_fwd_port(&recv->mad.smp),
1924 qp_info->qp->qp_num);
1925
1926 goto out;
1927 }
1928 }
1929
1930 local:
1931 /* Give driver "right of first refusal" on incoming MAD */
1932 if (port_priv->device->process_mad) {
1933 int ret;
1934
1935 ret = port_priv->device->process_mad(port_priv->device, 0,
1936 port_priv->port_num,
1937 wc, &recv->grh,
1938 &recv->mad.mad,
1939 &response->mad.mad);
1940 if (ret & IB_MAD_RESULT_SUCCESS) {
1941 if (ret & IB_MAD_RESULT_CONSUMED)
1942 goto out;
1943 if (ret & IB_MAD_RESULT_REPLY) {
1944 agent_send_response(&response->mad.mad,
1945 &recv->grh, wc,
1946 port_priv->device,
1947 port_num,
1948 qp_info->qp->qp_num);
1949 goto out;
1950 }
1951 }
1952 }
1953
1954 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1955 if (mad_agent) {
1956 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1957 /*
1958 * recv is freed up in error cases in ib_mad_complete_recv
1959 * or via recv_handler in ib_mad_complete_recv()
1960 */
1961 recv = NULL;
1962 }
1963
1964 out:
1965 /* Post another receive request for this QP */
1966 if (response) {
1967 ib_mad_post_receive_mads(qp_info, response);
1968 if (recv)
1969 kmem_cache_free(ib_mad_cache, recv);
1970 } else
1971 ib_mad_post_receive_mads(qp_info, recv);
1972 }
1973
1974 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1975 {
1976 struct ib_mad_send_wr_private *mad_send_wr;
1977 unsigned long delay;
1978
1979 if (list_empty(&mad_agent_priv->wait_list)) {
1980 __cancel_delayed_work(&mad_agent_priv->timed_work);
1981 } else {
1982 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1983 struct ib_mad_send_wr_private,
1984 agent_list);
1985
1986 if (time_after(mad_agent_priv->timeout,
1987 mad_send_wr->timeout)) {
1988 mad_agent_priv->timeout = mad_send_wr->timeout;
1989 __cancel_delayed_work(&mad_agent_priv->timed_work);
1990 delay = mad_send_wr->timeout - jiffies;
1991 if ((long)delay <= 0)
1992 delay = 1;
1993 queue_delayed_work(mad_agent_priv->qp_info->
1994 port_priv->wq,
1995 &mad_agent_priv->timed_work, delay);
1996 }
1997 }
1998 }
1999
2000 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2001 {
2002 struct ib_mad_agent_private *mad_agent_priv;
2003 struct ib_mad_send_wr_private *temp_mad_send_wr;
2004 struct list_head *list_item;
2005 unsigned long delay;
2006
2007 mad_agent_priv = mad_send_wr->mad_agent_priv;
2008 list_del(&mad_send_wr->agent_list);
2009
2010 delay = mad_send_wr->timeout;
2011 mad_send_wr->timeout += jiffies;
2012
2013 if (delay) {
2014 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2015 temp_mad_send_wr = list_entry(list_item,
2016 struct ib_mad_send_wr_private,
2017 agent_list);
2018 if (time_after(mad_send_wr->timeout,
2019 temp_mad_send_wr->timeout))
2020 break;
2021 }
2022 }
2023 else
2024 list_item = &mad_agent_priv->wait_list;
2025 list_add(&mad_send_wr->agent_list, list_item);
2026
2027 /* Reschedule a work item if we have a shorter timeout */
2028 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2029 __cancel_delayed_work(&mad_agent_priv->timed_work);
2030 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2031 &mad_agent_priv->timed_work, delay);
2032 }
2033 }
2034
2035 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2036 int timeout_ms)
2037 {
2038 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2039 wait_for_response(mad_send_wr);
2040 }
2041
2042 /*
2043 * Process a send work completion
2044 */
2045 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2046 struct ib_mad_send_wc *mad_send_wc)
2047 {
2048 struct ib_mad_agent_private *mad_agent_priv;
2049 unsigned long flags;
2050 int ret;
2051
2052 mad_agent_priv = mad_send_wr->mad_agent_priv;
2053 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2054 if (mad_agent_priv->agent.rmpp_version) {
2055 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2056 if (ret == IB_RMPP_RESULT_CONSUMED)
2057 goto done;
2058 } else
2059 ret = IB_RMPP_RESULT_UNHANDLED;
2060
2061 if (mad_send_wc->status != IB_WC_SUCCESS &&
2062 mad_send_wr->status == IB_WC_SUCCESS) {
2063 mad_send_wr->status = mad_send_wc->status;
2064 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2065 }
2066
2067 if (--mad_send_wr->refcount > 0) {
2068 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2069 mad_send_wr->status == IB_WC_SUCCESS) {
2070 wait_for_response(mad_send_wr);
2071 }
2072 goto done;
2073 }
2074
2075 /* Remove send from MAD agent and notify client of completion */
2076 list_del(&mad_send_wr->agent_list);
2077 adjust_timeout(mad_agent_priv);
2078 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2079
2080 if (mad_send_wr->status != IB_WC_SUCCESS )
2081 mad_send_wc->status = mad_send_wr->status;
2082 if (ret == IB_RMPP_RESULT_INTERNAL)
2083 ib_rmpp_send_handler(mad_send_wc);
2084 else
2085 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2086 mad_send_wc);
2087
2088 /* Release reference on agent taken when sending */
2089 deref_mad_agent(mad_agent_priv);
2090 return;
2091 done:
2092 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2093 }
2094
2095 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2096 struct ib_wc *wc)
2097 {
2098 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2099 struct ib_mad_list_head *mad_list;
2100 struct ib_mad_qp_info *qp_info;
2101 struct ib_mad_queue *send_queue;
2102 struct ib_send_wr *bad_send_wr;
2103 struct ib_mad_send_wc mad_send_wc;
2104 unsigned long flags;
2105 int ret;
2106
2107 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2108 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2109 mad_list);
2110 send_queue = mad_list->mad_queue;
2111 qp_info = send_queue->qp_info;
2112
2113 retry:
2114 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2115 mad_send_wr->header_mapping,
2116 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2117 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2118 mad_send_wr->payload_mapping,
2119 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2120 queued_send_wr = NULL;
2121 spin_lock_irqsave(&send_queue->lock, flags);
2122 list_del(&mad_list->list);
2123
2124 /* Move queued send to the send queue */
2125 if (send_queue->count-- > send_queue->max_active) {
2126 mad_list = container_of(qp_info->overflow_list.next,
2127 struct ib_mad_list_head, list);
2128 queued_send_wr = container_of(mad_list,
2129 struct ib_mad_send_wr_private,
2130 mad_list);
2131 list_move_tail(&mad_list->list, &send_queue->list);
2132 }
2133 spin_unlock_irqrestore(&send_queue->lock, flags);
2134
2135 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2136 mad_send_wc.status = wc->status;
2137 mad_send_wc.vendor_err = wc->vendor_err;
2138 if (atomic_read(&qp_info->snoop_count))
2139 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2140 IB_MAD_SNOOP_SEND_COMPLETIONS);
2141 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2142
2143 if (queued_send_wr) {
2144 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2145 &bad_send_wr);
2146 if (ret) {
2147 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2148 mad_send_wr = queued_send_wr;
2149 wc->status = IB_WC_LOC_QP_OP_ERR;
2150 goto retry;
2151 }
2152 }
2153 }
2154
2155 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2156 {
2157 struct ib_mad_send_wr_private *mad_send_wr;
2158 struct ib_mad_list_head *mad_list;
2159 unsigned long flags;
2160
2161 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2162 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2163 mad_send_wr = container_of(mad_list,
2164 struct ib_mad_send_wr_private,
2165 mad_list);
2166 mad_send_wr->retry = 1;
2167 }
2168 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2169 }
2170
2171 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2172 struct ib_wc *wc)
2173 {
2174 struct ib_mad_list_head *mad_list;
2175 struct ib_mad_qp_info *qp_info;
2176 struct ib_mad_send_wr_private *mad_send_wr;
2177 int ret;
2178
2179 /* Determine if failure was a send or receive */
2180 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2181 qp_info = mad_list->mad_queue->qp_info;
2182 if (mad_list->mad_queue == &qp_info->recv_queue)
2183 /*
2184 * Receive errors indicate that the QP has entered the error
2185 * state - error handling/shutdown code will cleanup
2186 */
2187 return;
2188
2189 /*
2190 * Send errors will transition the QP to SQE - move
2191 * QP to RTS and repost flushed work requests
2192 */
2193 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2194 mad_list);
2195 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2196 if (mad_send_wr->retry) {
2197 /* Repost send */
2198 struct ib_send_wr *bad_send_wr;
2199
2200 mad_send_wr->retry = 0;
2201 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2202 &bad_send_wr);
2203 if (ret)
2204 ib_mad_send_done_handler(port_priv, wc);
2205 } else
2206 ib_mad_send_done_handler(port_priv, wc);
2207 } else {
2208 struct ib_qp_attr *attr;
2209
2210 /* Transition QP to RTS and fail offending send */
2211 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2212 if (attr) {
2213 attr->qp_state = IB_QPS_RTS;
2214 attr->cur_qp_state = IB_QPS_SQE;
2215 ret = ib_modify_qp(qp_info->qp, attr,
2216 IB_QP_STATE | IB_QP_CUR_STATE);
2217 kfree(attr);
2218 if (ret)
2219 printk(KERN_ERR PFX "mad_error_handler - "
2220 "ib_modify_qp to RTS : %d\n", ret);
2221 else
2222 mark_sends_for_retry(qp_info);
2223 }
2224 ib_mad_send_done_handler(port_priv, wc);
2225 }
2226 }
2227
2228 /*
2229 * IB MAD completion callback
2230 */
2231 static void ib_mad_completion_handler(struct work_struct *work)
2232 {
2233 struct ib_mad_port_private *port_priv;
2234 struct ib_wc wc;
2235
2236 port_priv = container_of(work, struct ib_mad_port_private, work);
2237 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2238
2239 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2240 if (wc.status == IB_WC_SUCCESS) {
2241 switch (wc.opcode) {
2242 case IB_WC_SEND:
2243 ib_mad_send_done_handler(port_priv, &wc);
2244 break;
2245 case IB_WC_RECV:
2246 ib_mad_recv_done_handler(port_priv, &wc);
2247 break;
2248 default:
2249 BUG_ON(1);
2250 break;
2251 }
2252 } else
2253 mad_error_handler(port_priv, &wc);
2254 }
2255 }
2256
2257 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2258 {
2259 unsigned long flags;
2260 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2261 struct ib_mad_send_wc mad_send_wc;
2262 struct list_head cancel_list;
2263
2264 INIT_LIST_HEAD(&cancel_list);
2265
2266 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2267 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2268 &mad_agent_priv->send_list, agent_list) {
2269 if (mad_send_wr->status == IB_WC_SUCCESS) {
2270 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2271 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2272 }
2273 }
2274
2275 /* Empty wait list to prevent receives from finding a request */
2276 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2277 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2278
2279 /* Report all cancelled requests */
2280 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2281 mad_send_wc.vendor_err = 0;
2282
2283 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2284 &cancel_list, agent_list) {
2285 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2286 list_del(&mad_send_wr->agent_list);
2287 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2288 &mad_send_wc);
2289 atomic_dec(&mad_agent_priv->refcount);
2290 }
2291 }
2292
2293 static struct ib_mad_send_wr_private*
2294 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2295 struct ib_mad_send_buf *send_buf)
2296 {
2297 struct ib_mad_send_wr_private *mad_send_wr;
2298
2299 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2300 agent_list) {
2301 if (&mad_send_wr->send_buf == send_buf)
2302 return mad_send_wr;
2303 }
2304
2305 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2306 agent_list) {
2307 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2308 &mad_send_wr->send_buf == send_buf)
2309 return mad_send_wr;
2310 }
2311 return NULL;
2312 }
2313
2314 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2315 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2316 {
2317 struct ib_mad_agent_private *mad_agent_priv;
2318 struct ib_mad_send_wr_private *mad_send_wr;
2319 unsigned long flags;
2320 int active;
2321
2322 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2323 agent);
2324 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2325 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2326 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2327 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2328 return -EINVAL;
2329 }
2330
2331 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2332 if (!timeout_ms) {
2333 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2334 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2335 }
2336
2337 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2338 if (active)
2339 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2340 else
2341 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2342
2343 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2344 return 0;
2345 }
2346 EXPORT_SYMBOL(ib_modify_mad);
2347
2348 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2349 struct ib_mad_send_buf *send_buf)
2350 {
2351 ib_modify_mad(mad_agent, send_buf, 0);
2352 }
2353 EXPORT_SYMBOL(ib_cancel_mad);
2354
2355 static void local_completions(struct work_struct *work)
2356 {
2357 struct ib_mad_agent_private *mad_agent_priv;
2358 struct ib_mad_local_private *local;
2359 struct ib_mad_agent_private *recv_mad_agent;
2360 unsigned long flags;
2361 int free_mad;
2362 struct ib_wc wc;
2363 struct ib_mad_send_wc mad_send_wc;
2364
2365 mad_agent_priv =
2366 container_of(work, struct ib_mad_agent_private, local_work);
2367
2368 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2369 while (!list_empty(&mad_agent_priv->local_list)) {
2370 local = list_entry(mad_agent_priv->local_list.next,
2371 struct ib_mad_local_private,
2372 completion_list);
2373 list_del(&local->completion_list);
2374 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2375 free_mad = 0;
2376 if (local->mad_priv) {
2377 recv_mad_agent = local->recv_mad_agent;
2378 if (!recv_mad_agent) {
2379 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2380 free_mad = 1;
2381 goto local_send_completion;
2382 }
2383
2384 /*
2385 * Defined behavior is to complete response
2386 * before request
2387 */
2388 build_smp_wc(recv_mad_agent->agent.qp,
2389 (unsigned long) local->mad_send_wr,
2390 be16_to_cpu(IB_LID_PERMISSIVE),
2391 0, recv_mad_agent->agent.port_num, &wc);
2392
2393 local->mad_priv->header.recv_wc.wc = &wc;
2394 local->mad_priv->header.recv_wc.mad_len =
2395 sizeof(struct ib_mad);
2396 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2397 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2398 &local->mad_priv->header.recv_wc.rmpp_list);
2399 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2400 local->mad_priv->header.recv_wc.recv_buf.mad =
2401 &local->mad_priv->mad.mad;
2402 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2403 snoop_recv(recv_mad_agent->qp_info,
2404 &local->mad_priv->header.recv_wc,
2405 IB_MAD_SNOOP_RECVS);
2406 recv_mad_agent->agent.recv_handler(
2407 &recv_mad_agent->agent,
2408 &local->mad_priv->header.recv_wc);
2409 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2410 atomic_dec(&recv_mad_agent->refcount);
2411 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2412 }
2413
2414 local_send_completion:
2415 /* Complete send */
2416 mad_send_wc.status = IB_WC_SUCCESS;
2417 mad_send_wc.vendor_err = 0;
2418 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2419 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2420 snoop_send(mad_agent_priv->qp_info,
2421 &local->mad_send_wr->send_buf,
2422 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2423 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2424 &mad_send_wc);
2425
2426 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2427 atomic_dec(&mad_agent_priv->refcount);
2428 if (free_mad)
2429 kmem_cache_free(ib_mad_cache, local->mad_priv);
2430 kfree(local);
2431 }
2432 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2433 }
2434
2435 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2436 {
2437 int ret;
2438
2439 if (!mad_send_wr->retries_left)
2440 return -ETIMEDOUT;
2441
2442 mad_send_wr->retries_left--;
2443 mad_send_wr->send_buf.retries++;
2444
2445 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2446
2447 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2448 ret = ib_retry_rmpp(mad_send_wr);
2449 switch (ret) {
2450 case IB_RMPP_RESULT_UNHANDLED:
2451 ret = ib_send_mad(mad_send_wr);
2452 break;
2453 case IB_RMPP_RESULT_CONSUMED:
2454 ret = 0;
2455 break;
2456 default:
2457 ret = -ECOMM;
2458 break;
2459 }
2460 } else
2461 ret = ib_send_mad(mad_send_wr);
2462
2463 if (!ret) {
2464 mad_send_wr->refcount++;
2465 list_add_tail(&mad_send_wr->agent_list,
2466 &mad_send_wr->mad_agent_priv->send_list);
2467 }
2468 return ret;
2469 }
2470
2471 static void timeout_sends(struct work_struct *work)
2472 {
2473 struct ib_mad_agent_private *mad_agent_priv;
2474 struct ib_mad_send_wr_private *mad_send_wr;
2475 struct ib_mad_send_wc mad_send_wc;
2476 unsigned long flags, delay;
2477
2478 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2479 timed_work.work);
2480 mad_send_wc.vendor_err = 0;
2481
2482 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2483 while (!list_empty(&mad_agent_priv->wait_list)) {
2484 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2485 struct ib_mad_send_wr_private,
2486 agent_list);
2487
2488 if (time_after(mad_send_wr->timeout, jiffies)) {
2489 delay = mad_send_wr->timeout - jiffies;
2490 if ((long)delay <= 0)
2491 delay = 1;
2492 queue_delayed_work(mad_agent_priv->qp_info->
2493 port_priv->wq,
2494 &mad_agent_priv->timed_work, delay);
2495 break;
2496 }
2497
2498 list_del(&mad_send_wr->agent_list);
2499 if (mad_send_wr->status == IB_WC_SUCCESS &&
2500 !retry_send(mad_send_wr))
2501 continue;
2502
2503 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2504
2505 if (mad_send_wr->status == IB_WC_SUCCESS)
2506 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2507 else
2508 mad_send_wc.status = mad_send_wr->status;
2509 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2510 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2511 &mad_send_wc);
2512
2513 atomic_dec(&mad_agent_priv->refcount);
2514 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2515 }
2516 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2517 }
2518
2519 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2520 {
2521 struct ib_mad_port_private *port_priv = cq->cq_context;
2522 unsigned long flags;
2523
2524 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2525 if (!list_empty(&port_priv->port_list))
2526 queue_work(port_priv->wq, &port_priv->work);
2527 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2528 }
2529
2530 /*
2531 * Allocate receive MADs and post receive WRs for them
2532 */
2533 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2534 struct ib_mad_private *mad)
2535 {
2536 unsigned long flags;
2537 int post, ret;
2538 struct ib_mad_private *mad_priv;
2539 struct ib_sge sg_list;
2540 struct ib_recv_wr recv_wr, *bad_recv_wr;
2541 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2542
2543 /* Initialize common scatter list fields */
2544 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2545 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2546
2547 /* Initialize common receive WR fields */
2548 recv_wr.next = NULL;
2549 recv_wr.sg_list = &sg_list;
2550 recv_wr.num_sge = 1;
2551
2552 do {
2553 /* Allocate and map receive buffer */
2554 if (mad) {
2555 mad_priv = mad;
2556 mad = NULL;
2557 } else {
2558 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2559 if (!mad_priv) {
2560 printk(KERN_ERR PFX "No memory for receive buffer\n");
2561 ret = -ENOMEM;
2562 break;
2563 }
2564 }
2565 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2566 &mad_priv->grh,
2567 sizeof *mad_priv -
2568 sizeof mad_priv->header,
2569 DMA_FROM_DEVICE);
2570 mad_priv->header.mapping = sg_list.addr;
2571 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2572 mad_priv->header.mad_list.mad_queue = recv_queue;
2573
2574 /* Post receive WR */
2575 spin_lock_irqsave(&recv_queue->lock, flags);
2576 post = (++recv_queue->count < recv_queue->max_active);
2577 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2578 spin_unlock_irqrestore(&recv_queue->lock, flags);
2579 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2580 if (ret) {
2581 spin_lock_irqsave(&recv_queue->lock, flags);
2582 list_del(&mad_priv->header.mad_list.list);
2583 recv_queue->count--;
2584 spin_unlock_irqrestore(&recv_queue->lock, flags);
2585 ib_dma_unmap_single(qp_info->port_priv->device,
2586 mad_priv->header.mapping,
2587 sizeof *mad_priv -
2588 sizeof mad_priv->header,
2589 DMA_FROM_DEVICE);
2590 kmem_cache_free(ib_mad_cache, mad_priv);
2591 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2592 break;
2593 }
2594 } while (post);
2595
2596 return ret;
2597 }
2598
2599 /*
2600 * Return all the posted receive MADs
2601 */
2602 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2603 {
2604 struct ib_mad_private_header *mad_priv_hdr;
2605 struct ib_mad_private *recv;
2606 struct ib_mad_list_head *mad_list;
2607
2608 if (!qp_info->qp)
2609 return;
2610
2611 while (!list_empty(&qp_info->recv_queue.list)) {
2612
2613 mad_list = list_entry(qp_info->recv_queue.list.next,
2614 struct ib_mad_list_head, list);
2615 mad_priv_hdr = container_of(mad_list,
2616 struct ib_mad_private_header,
2617 mad_list);
2618 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2619 header);
2620
2621 /* Remove from posted receive MAD list */
2622 list_del(&mad_list->list);
2623
2624 ib_dma_unmap_single(qp_info->port_priv->device,
2625 recv->header.mapping,
2626 sizeof(struct ib_mad_private) -
2627 sizeof(struct ib_mad_private_header),
2628 DMA_FROM_DEVICE);
2629 kmem_cache_free(ib_mad_cache, recv);
2630 }
2631
2632 qp_info->recv_queue.count = 0;
2633 }
2634
2635 /*
2636 * Start the port
2637 */
2638 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2639 {
2640 int ret, i;
2641 struct ib_qp_attr *attr;
2642 struct ib_qp *qp;
2643
2644 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2645 if (!attr) {
2646 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2647 return -ENOMEM;
2648 }
2649
2650 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2651 qp = port_priv->qp_info[i].qp;
2652 if (!qp)
2653 continue;
2654
2655 /*
2656 * PKey index for QP1 is irrelevant but
2657 * one is needed for the Reset to Init transition
2658 */
2659 attr->qp_state = IB_QPS_INIT;
2660 attr->pkey_index = 0;
2661 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2663 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2664 if (ret) {
2665 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2666 "INIT: %d\n", i, ret);
2667 goto out;
2668 }
2669
2670 attr->qp_state = IB_QPS_RTR;
2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2672 if (ret) {
2673 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674 "RTR: %d\n", i, ret);
2675 goto out;
2676 }
2677
2678 attr->qp_state = IB_QPS_RTS;
2679 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2680 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2681 if (ret) {
2682 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2683 "RTS: %d\n", i, ret);
2684 goto out;
2685 }
2686 }
2687
2688 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2689 if (ret) {
2690 printk(KERN_ERR PFX "Failed to request completion "
2691 "notification: %d\n", ret);
2692 goto out;
2693 }
2694
2695 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2696 if (!port_priv->qp_info[i].qp)
2697 continue;
2698
2699 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2700 if (ret) {
2701 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2702 goto out;
2703 }
2704 }
2705 out:
2706 kfree(attr);
2707 return ret;
2708 }
2709
2710 static void qp_event_handler(struct ib_event *event, void *qp_context)
2711 {
2712 struct ib_mad_qp_info *qp_info = qp_context;
2713
2714 /* It's worse than that! He's dead, Jim! */
2715 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2716 event->event, qp_info->qp->qp_num);
2717 }
2718
2719 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2720 struct ib_mad_queue *mad_queue)
2721 {
2722 mad_queue->qp_info = qp_info;
2723 mad_queue->count = 0;
2724 spin_lock_init(&mad_queue->lock);
2725 INIT_LIST_HEAD(&mad_queue->list);
2726 }
2727
2728 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2729 struct ib_mad_qp_info *qp_info)
2730 {
2731 qp_info->port_priv = port_priv;
2732 init_mad_queue(qp_info, &qp_info->send_queue);
2733 init_mad_queue(qp_info, &qp_info->recv_queue);
2734 INIT_LIST_HEAD(&qp_info->overflow_list);
2735 spin_lock_init(&qp_info->snoop_lock);
2736 qp_info->snoop_table = NULL;
2737 qp_info->snoop_table_size = 0;
2738 atomic_set(&qp_info->snoop_count, 0);
2739 }
2740
2741 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2742 enum ib_qp_type qp_type)
2743 {
2744 struct ib_qp_init_attr qp_init_attr;
2745 int ret;
2746
2747 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2748 qp_init_attr.send_cq = qp_info->port_priv->cq;
2749 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2750 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2751 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2752 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2753 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2754 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2755 qp_init_attr.qp_type = qp_type;
2756 qp_init_attr.port_num = qp_info->port_priv->port_num;
2757 qp_init_attr.qp_context = qp_info;
2758 qp_init_attr.event_handler = qp_event_handler;
2759 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2760 if (IS_ERR(qp_info->qp)) {
2761 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2762 get_spl_qp_index(qp_type));
2763 ret = PTR_ERR(qp_info->qp);
2764 goto error;
2765 }
2766 /* Use minimum queue sizes unless the CQ is resized */
2767 qp_info->send_queue.max_active = mad_sendq_size;
2768 qp_info->recv_queue.max_active = mad_recvq_size;
2769 return 0;
2770
2771 error:
2772 return ret;
2773 }
2774
2775 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2776 {
2777 if (!qp_info->qp)
2778 return;
2779
2780 ib_destroy_qp(qp_info->qp);
2781 kfree(qp_info->snoop_table);
2782 }
2783
2784 /*
2785 * Open the port
2786 * Create the QP, PD, MR, and CQ if needed
2787 */
2788 static int ib_mad_port_open(struct ib_device *device,
2789 int port_num)
2790 {
2791 int ret, cq_size;
2792 struct ib_mad_port_private *port_priv;
2793 unsigned long flags;
2794 char name[sizeof "ib_mad123"];
2795 int has_smi;
2796
2797 /* Create new device info */
2798 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2799 if (!port_priv) {
2800 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2801 return -ENOMEM;
2802 }
2803
2804 port_priv->device = device;
2805 port_priv->port_num = port_num;
2806 spin_lock_init(&port_priv->reg_lock);
2807 INIT_LIST_HEAD(&port_priv->agent_list);
2808 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2809 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2810
2811 cq_size = mad_sendq_size + mad_recvq_size;
2812 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2813 if (has_smi)
2814 cq_size *= 2;
2815
2816 port_priv->cq = ib_create_cq(port_priv->device,
2817 ib_mad_thread_completion_handler,
2818 NULL, port_priv, cq_size, 0);
2819 if (IS_ERR(port_priv->cq)) {
2820 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2821 ret = PTR_ERR(port_priv->cq);
2822 goto error3;
2823 }
2824
2825 port_priv->pd = ib_alloc_pd(device);
2826 if (IS_ERR(port_priv->pd)) {
2827 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2828 ret = PTR_ERR(port_priv->pd);
2829 goto error4;
2830 }
2831
2832 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2833 if (IS_ERR(port_priv->mr)) {
2834 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2835 ret = PTR_ERR(port_priv->mr);
2836 goto error5;
2837 }
2838
2839 if (has_smi) {
2840 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2841 if (ret)
2842 goto error6;
2843 }
2844 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2845 if (ret)
2846 goto error7;
2847
2848 snprintf(name, sizeof name, "ib_mad%d", port_num);
2849 port_priv->wq = create_singlethread_workqueue(name);
2850 if (!port_priv->wq) {
2851 ret = -ENOMEM;
2852 goto error8;
2853 }
2854 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2855
2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2857 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2858 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2859
2860 ret = ib_mad_port_start(port_priv);
2861 if (ret) {
2862 printk(KERN_ERR PFX "Couldn't start port\n");
2863 goto error9;
2864 }
2865
2866 return 0;
2867
2868 error9:
2869 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2870 list_del_init(&port_priv->port_list);
2871 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2872
2873 destroy_workqueue(port_priv->wq);
2874 error8:
2875 destroy_mad_qp(&port_priv->qp_info[1]);
2876 error7:
2877 destroy_mad_qp(&port_priv->qp_info[0]);
2878 error6:
2879 ib_dereg_mr(port_priv->mr);
2880 error5:
2881 ib_dealloc_pd(port_priv->pd);
2882 error4:
2883 ib_destroy_cq(port_priv->cq);
2884 cleanup_recv_queue(&port_priv->qp_info[1]);
2885 cleanup_recv_queue(&port_priv->qp_info[0]);
2886 error3:
2887 kfree(port_priv);
2888
2889 return ret;
2890 }
2891
2892 /*
2893 * Close the port
2894 * If there are no classes using the port, free the port
2895 * resources (CQ, MR, PD, QP) and remove the port's info structure
2896 */
2897 static int ib_mad_port_close(struct ib_device *device, int port_num)
2898 {
2899 struct ib_mad_port_private *port_priv;
2900 unsigned long flags;
2901
2902 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2903 port_priv = __ib_get_mad_port(device, port_num);
2904 if (port_priv == NULL) {
2905 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2906 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2907 return -ENODEV;
2908 }
2909 list_del_init(&port_priv->port_list);
2910 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2911
2912 destroy_workqueue(port_priv->wq);
2913 destroy_mad_qp(&port_priv->qp_info[1]);
2914 destroy_mad_qp(&port_priv->qp_info[0]);
2915 ib_dereg_mr(port_priv->mr);
2916 ib_dealloc_pd(port_priv->pd);
2917 ib_destroy_cq(port_priv->cq);
2918 cleanup_recv_queue(&port_priv->qp_info[1]);
2919 cleanup_recv_queue(&port_priv->qp_info[0]);
2920 /* XXX: Handle deallocation of MAD registration tables */
2921
2922 kfree(port_priv);
2923
2924 return 0;
2925 }
2926
2927 static void ib_mad_init_device(struct ib_device *device)
2928 {
2929 int start, end, i;
2930
2931 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2932 return;
2933
2934 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2935 start = 0;
2936 end = 0;
2937 } else {
2938 start = 1;
2939 end = device->phys_port_cnt;
2940 }
2941
2942 for (i = start; i <= end; i++) {
2943 if (ib_mad_port_open(device, i)) {
2944 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2945 device->name, i);
2946 goto error;
2947 }
2948 if (ib_agent_port_open(device, i)) {
2949 printk(KERN_ERR PFX "Couldn't open %s port %d "
2950 "for agents\n",
2951 device->name, i);
2952 goto error_agent;
2953 }
2954 }
2955 return;
2956
2957 error_agent:
2958 if (ib_mad_port_close(device, i))
2959 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2960 device->name, i);
2961
2962 error:
2963 i--;
2964
2965 while (i >= start) {
2966 if (ib_agent_port_close(device, i))
2967 printk(KERN_ERR PFX "Couldn't close %s port %d "
2968 "for agents\n",
2969 device->name, i);
2970 if (ib_mad_port_close(device, i))
2971 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2972 device->name, i);
2973 i--;
2974 }
2975 }
2976
2977 static void ib_mad_remove_device(struct ib_device *device)
2978 {
2979 int i, num_ports, cur_port;
2980
2981 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2982 return;
2983
2984 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2985 num_ports = 1;
2986 cur_port = 0;
2987 } else {
2988 num_ports = device->phys_port_cnt;
2989 cur_port = 1;
2990 }
2991 for (i = 0; i < num_ports; i++, cur_port++) {
2992 if (ib_agent_port_close(device, cur_port))
2993 printk(KERN_ERR PFX "Couldn't close %s port %d "
2994 "for agents\n",
2995 device->name, cur_port);
2996 if (ib_mad_port_close(device, cur_port))
2997 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2998 device->name, cur_port);
2999 }
3000 }
3001
3002 static struct ib_client mad_client = {
3003 .name = "mad",
3004 .add = ib_mad_init_device,
3005 .remove = ib_mad_remove_device
3006 };
3007
3008 static int __init ib_mad_init_module(void)
3009 {
3010 int ret;
3011
3012 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3013 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3014
3015 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3016 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3017
3018 ib_mad_cache = kmem_cache_create("ib_mad",
3019 sizeof(struct ib_mad_private),
3020 0,
3021 SLAB_HWCACHE_ALIGN,
3022 NULL);
3023 if (!ib_mad_cache) {
3024 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3025 ret = -ENOMEM;
3026 goto error1;
3027 }
3028
3029 INIT_LIST_HEAD(&ib_mad_port_list);
3030
3031 if (ib_register_client(&mad_client)) {
3032 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3033 ret = -EINVAL;
3034 goto error2;
3035 }
3036
3037 return 0;
3038
3039 error2:
3040 kmem_cache_destroy(ib_mad_cache);
3041 error1:
3042 return ret;
3043 }
3044
3045 static void __exit ib_mad_cleanup_module(void)
3046 {
3047 ib_unregister_client(&mad_client);
3048 kmem_cache_destroy(ib_mad_cache);
3049 }
3050
3051 module_init(ib_mad_init_module);
3052 module_exit(ib_mad_cleanup_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree