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Merge branch 'upstream-fixes'
[deliverable/linux.git] / drivers / infiniband / core / mad.c
1 /*
2 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 * $Id: mad.c 2817 2005-07-07 11:29:26Z halr $
35 */
36 #include <linux/dma-mapping.h>
37
38 #include "mad_priv.h"
39 #include "mad_rmpp.h"
40 #include "smi.h"
41 #include "agent.h"
42
43 MODULE_LICENSE("Dual BSD/GPL");
44 MODULE_DESCRIPTION("kernel IB MAD API");
45 MODULE_AUTHOR("Hal Rosenstock");
46 MODULE_AUTHOR("Sean Hefty");
47
48
49 kmem_cache_t *ib_mad_cache;
50
51 static struct list_head ib_mad_port_list;
52 static u32 ib_mad_client_id = 0;
53
54 /* Port list lock */
55 static spinlock_t ib_mad_port_list_lock;
56
57
58 /* Forward declarations */
59 static int method_in_use(struct ib_mad_mgmt_method_table **method,
60 struct ib_mad_reg_req *mad_reg_req);
61 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
62 static struct ib_mad_agent_private *find_mad_agent(
63 struct ib_mad_port_private *port_priv,
64 struct ib_mad *mad);
65 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
66 struct ib_mad_private *mad);
67 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
68 static void timeout_sends(void *data);
69 static void local_completions(void *data);
70 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
71 struct ib_mad_agent_private *agent_priv,
72 u8 mgmt_class);
73 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
74 struct ib_mad_agent_private *agent_priv);
75
76 /*
77 * Returns a ib_mad_port_private structure or NULL for a device/port
78 * Assumes ib_mad_port_list_lock is being held
79 */
80 static inline struct ib_mad_port_private *
81 __ib_get_mad_port(struct ib_device *device, int port_num)
82 {
83 struct ib_mad_port_private *entry;
84
85 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
86 if (entry->device == device && entry->port_num == port_num)
87 return entry;
88 }
89 return NULL;
90 }
91
92 /*
93 * Wrapper function to return a ib_mad_port_private structure or NULL
94 * for a device/port
95 */
96 static inline struct ib_mad_port_private *
97 ib_get_mad_port(struct ib_device *device, int port_num)
98 {
99 struct ib_mad_port_private *entry;
100 unsigned long flags;
101
102 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
103 entry = __ib_get_mad_port(device, port_num);
104 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
105
106 return entry;
107 }
108
109 static inline u8 convert_mgmt_class(u8 mgmt_class)
110 {
111 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
112 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
113 0 : mgmt_class;
114 }
115
116 static int get_spl_qp_index(enum ib_qp_type qp_type)
117 {
118 switch (qp_type)
119 {
120 case IB_QPT_SMI:
121 return 0;
122 case IB_QPT_GSI:
123 return 1;
124 default:
125 return -1;
126 }
127 }
128
129 static int vendor_class_index(u8 mgmt_class)
130 {
131 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
132 }
133
134 static int is_vendor_class(u8 mgmt_class)
135 {
136 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
137 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
138 return 0;
139 return 1;
140 }
141
142 static int is_vendor_oui(char *oui)
143 {
144 if (oui[0] || oui[1] || oui[2])
145 return 1;
146 return 0;
147 }
148
149 static int is_vendor_method_in_use(
150 struct ib_mad_mgmt_vendor_class *vendor_class,
151 struct ib_mad_reg_req *mad_reg_req)
152 {
153 struct ib_mad_mgmt_method_table *method;
154 int i;
155
156 for (i = 0; i < MAX_MGMT_OUI; i++) {
157 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
158 method = vendor_class->method_table[i];
159 if (method) {
160 if (method_in_use(&method, mad_reg_req))
161 return 1;
162 else
163 break;
164 }
165 }
166 }
167 return 0;
168 }
169
170 /*
171 * ib_register_mad_agent - Register to send/receive MADs
172 */
173 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
174 u8 port_num,
175 enum ib_qp_type qp_type,
176 struct ib_mad_reg_req *mad_reg_req,
177 u8 rmpp_version,
178 ib_mad_send_handler send_handler,
179 ib_mad_recv_handler recv_handler,
180 void *context)
181 {
182 struct ib_mad_port_private *port_priv;
183 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
184 struct ib_mad_agent_private *mad_agent_priv;
185 struct ib_mad_reg_req *reg_req = NULL;
186 struct ib_mad_mgmt_class_table *class;
187 struct ib_mad_mgmt_vendor_class_table *vendor;
188 struct ib_mad_mgmt_vendor_class *vendor_class;
189 struct ib_mad_mgmt_method_table *method;
190 int ret2, qpn;
191 unsigned long flags;
192 u8 mgmt_class, vclass;
193
194 /* Validate parameters */
195 qpn = get_spl_qp_index(qp_type);
196 if (qpn == -1)
197 goto error1;
198
199 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
200 goto error1;
201
202 /* Validate MAD registration request if supplied */
203 if (mad_reg_req) {
204 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
205 goto error1;
206 if (!recv_handler)
207 goto error1;
208 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
209 /*
210 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
211 * one in this range currently allowed
212 */
213 if (mad_reg_req->mgmt_class !=
214 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
215 goto error1;
216 } else if (mad_reg_req->mgmt_class == 0) {
217 /*
218 * Class 0 is reserved in IBA and is used for
219 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
220 */
221 goto error1;
222 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
223 /*
224 * If class is in "new" vendor range,
225 * ensure supplied OUI is not zero
226 */
227 if (!is_vendor_oui(mad_reg_req->oui))
228 goto error1;
229 }
230 /* Make sure class supplied is consistent with QP type */
231 if (qp_type == IB_QPT_SMI) {
232 if ((mad_reg_req->mgmt_class !=
233 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
234 (mad_reg_req->mgmt_class !=
235 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
236 goto error1;
237 } else {
238 if ((mad_reg_req->mgmt_class ==
239 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
240 (mad_reg_req->mgmt_class ==
241 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
242 goto error1;
243 }
244 } else {
245 /* No registration request supplied */
246 if (!send_handler)
247 goto error1;
248 }
249
250 /* Validate device and port */
251 port_priv = ib_get_mad_port(device, port_num);
252 if (!port_priv) {
253 ret = ERR_PTR(-ENODEV);
254 goto error1;
255 }
256
257 /* Allocate structures */
258 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
259 if (!mad_agent_priv) {
260 ret = ERR_PTR(-ENOMEM);
261 goto error1;
262 }
263
264 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
265 IB_ACCESS_LOCAL_WRITE);
266 if (IS_ERR(mad_agent_priv->agent.mr)) {
267 ret = ERR_PTR(-ENOMEM);
268 goto error2;
269 }
270
271 if (mad_reg_req) {
272 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
273 if (!reg_req) {
274 ret = ERR_PTR(-ENOMEM);
275 goto error3;
276 }
277 /* Make a copy of the MAD registration request */
278 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
279 }
280
281 /* Now, fill in the various structures */
282 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
283 mad_agent_priv->reg_req = reg_req;
284 mad_agent_priv->agent.rmpp_version = rmpp_version;
285 mad_agent_priv->agent.device = device;
286 mad_agent_priv->agent.recv_handler = recv_handler;
287 mad_agent_priv->agent.send_handler = send_handler;
288 mad_agent_priv->agent.context = context;
289 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
290 mad_agent_priv->agent.port_num = port_num;
291
292 spin_lock_irqsave(&port_priv->reg_lock, flags);
293 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
294
295 /*
296 * Make sure MAD registration (if supplied)
297 * is non overlapping with any existing ones
298 */
299 if (mad_reg_req) {
300 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
301 if (!is_vendor_class(mgmt_class)) {
302 class = port_priv->version[mad_reg_req->
303 mgmt_class_version].class;
304 if (class) {
305 method = class->method_table[mgmt_class];
306 if (method) {
307 if (method_in_use(&method,
308 mad_reg_req))
309 goto error4;
310 }
311 }
312 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
313 mgmt_class);
314 } else {
315 /* "New" vendor class range */
316 vendor = port_priv->version[mad_reg_req->
317 mgmt_class_version].vendor;
318 if (vendor) {
319 vclass = vendor_class_index(mgmt_class);
320 vendor_class = vendor->vendor_class[vclass];
321 if (vendor_class) {
322 if (is_vendor_method_in_use(
323 vendor_class,
324 mad_reg_req))
325 goto error4;
326 }
327 }
328 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
329 }
330 if (ret2) {
331 ret = ERR_PTR(ret2);
332 goto error4;
333 }
334 }
335
336 /* Add mad agent into port's agent list */
337 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
338 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
339
340 spin_lock_init(&mad_agent_priv->lock);
341 INIT_LIST_HEAD(&mad_agent_priv->send_list);
342 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
343 INIT_LIST_HEAD(&mad_agent_priv->done_list);
344 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
345 INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
346 INIT_LIST_HEAD(&mad_agent_priv->local_list);
347 INIT_WORK(&mad_agent_priv->local_work, local_completions,
348 mad_agent_priv);
349 atomic_set(&mad_agent_priv->refcount, 1);
350 init_waitqueue_head(&mad_agent_priv->wait);
351
352 return &mad_agent_priv->agent;
353
354 error4:
355 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
356 kfree(reg_req);
357 error3:
358 ib_dereg_mr(mad_agent_priv->agent.mr);
359 error2:
360 kfree(mad_agent_priv);
361 error1:
362 return ret;
363 }
364 EXPORT_SYMBOL(ib_register_mad_agent);
365
366 static inline int is_snooping_sends(int mad_snoop_flags)
367 {
368 return (mad_snoop_flags &
369 (/*IB_MAD_SNOOP_POSTED_SENDS |
370 IB_MAD_SNOOP_RMPP_SENDS |*/
371 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
372 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
373 }
374
375 static inline int is_snooping_recvs(int mad_snoop_flags)
376 {
377 return (mad_snoop_flags &
378 (IB_MAD_SNOOP_RECVS /*|
379 IB_MAD_SNOOP_RMPP_RECVS*/));
380 }
381
382 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
383 struct ib_mad_snoop_private *mad_snoop_priv)
384 {
385 struct ib_mad_snoop_private **new_snoop_table;
386 unsigned long flags;
387 int i;
388
389 spin_lock_irqsave(&qp_info->snoop_lock, flags);
390 /* Check for empty slot in array. */
391 for (i = 0; i < qp_info->snoop_table_size; i++)
392 if (!qp_info->snoop_table[i])
393 break;
394
395 if (i == qp_info->snoop_table_size) {
396 /* Grow table. */
397 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
398 qp_info->snoop_table_size + 1,
399 GFP_ATOMIC);
400 if (!new_snoop_table) {
401 i = -ENOMEM;
402 goto out;
403 }
404 if (qp_info->snoop_table) {
405 memcpy(new_snoop_table, qp_info->snoop_table,
406 sizeof mad_snoop_priv *
407 qp_info->snoop_table_size);
408 kfree(qp_info->snoop_table);
409 }
410 qp_info->snoop_table = new_snoop_table;
411 qp_info->snoop_table_size++;
412 }
413 qp_info->snoop_table[i] = mad_snoop_priv;
414 atomic_inc(&qp_info->snoop_count);
415 out:
416 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
417 return i;
418 }
419
420 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
421 u8 port_num,
422 enum ib_qp_type qp_type,
423 int mad_snoop_flags,
424 ib_mad_snoop_handler snoop_handler,
425 ib_mad_recv_handler recv_handler,
426 void *context)
427 {
428 struct ib_mad_port_private *port_priv;
429 struct ib_mad_agent *ret;
430 struct ib_mad_snoop_private *mad_snoop_priv;
431 int qpn;
432
433 /* Validate parameters */
434 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
435 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
436 ret = ERR_PTR(-EINVAL);
437 goto error1;
438 }
439 qpn = get_spl_qp_index(qp_type);
440 if (qpn == -1) {
441 ret = ERR_PTR(-EINVAL);
442 goto error1;
443 }
444 port_priv = ib_get_mad_port(device, port_num);
445 if (!port_priv) {
446 ret = ERR_PTR(-ENODEV);
447 goto error1;
448 }
449 /* Allocate structures */
450 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
451 if (!mad_snoop_priv) {
452 ret = ERR_PTR(-ENOMEM);
453 goto error1;
454 }
455
456 /* Now, fill in the various structures */
457 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
458 mad_snoop_priv->agent.device = device;
459 mad_snoop_priv->agent.recv_handler = recv_handler;
460 mad_snoop_priv->agent.snoop_handler = snoop_handler;
461 mad_snoop_priv->agent.context = context;
462 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
463 mad_snoop_priv->agent.port_num = port_num;
464 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
465 init_waitqueue_head(&mad_snoop_priv->wait);
466 mad_snoop_priv->snoop_index = register_snoop_agent(
467 &port_priv->qp_info[qpn],
468 mad_snoop_priv);
469 if (mad_snoop_priv->snoop_index < 0) {
470 ret = ERR_PTR(mad_snoop_priv->snoop_index);
471 goto error2;
472 }
473
474 atomic_set(&mad_snoop_priv->refcount, 1);
475 return &mad_snoop_priv->agent;
476
477 error2:
478 kfree(mad_snoop_priv);
479 error1:
480 return ret;
481 }
482 EXPORT_SYMBOL(ib_register_mad_snoop);
483
484 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
485 {
486 struct ib_mad_port_private *port_priv;
487 unsigned long flags;
488
489 /* Note that we could still be handling received MADs */
490
491 /*
492 * Canceling all sends results in dropping received response
493 * MADs, preventing us from queuing additional work
494 */
495 cancel_mads(mad_agent_priv);
496 port_priv = mad_agent_priv->qp_info->port_priv;
497 cancel_delayed_work(&mad_agent_priv->timed_work);
498
499 spin_lock_irqsave(&port_priv->reg_lock, flags);
500 remove_mad_reg_req(mad_agent_priv);
501 list_del(&mad_agent_priv->agent_list);
502 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
503
504 flush_workqueue(port_priv->wq);
505 ib_cancel_rmpp_recvs(mad_agent_priv);
506
507 atomic_dec(&mad_agent_priv->refcount);
508 wait_event(mad_agent_priv->wait,
509 !atomic_read(&mad_agent_priv->refcount));
510
511 kfree(mad_agent_priv->reg_req);
512 ib_dereg_mr(mad_agent_priv->agent.mr);
513 kfree(mad_agent_priv);
514 }
515
516 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
517 {
518 struct ib_mad_qp_info *qp_info;
519 unsigned long flags;
520
521 qp_info = mad_snoop_priv->qp_info;
522 spin_lock_irqsave(&qp_info->snoop_lock, flags);
523 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
524 atomic_dec(&qp_info->snoop_count);
525 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
526
527 atomic_dec(&mad_snoop_priv->refcount);
528 wait_event(mad_snoop_priv->wait,
529 !atomic_read(&mad_snoop_priv->refcount));
530
531 kfree(mad_snoop_priv);
532 }
533
534 /*
535 * ib_unregister_mad_agent - Unregisters a client from using MAD services
536 */
537 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
538 {
539 struct ib_mad_agent_private *mad_agent_priv;
540 struct ib_mad_snoop_private *mad_snoop_priv;
541
542 /* If the TID is zero, the agent can only snoop. */
543 if (mad_agent->hi_tid) {
544 mad_agent_priv = container_of(mad_agent,
545 struct ib_mad_agent_private,
546 agent);
547 unregister_mad_agent(mad_agent_priv);
548 } else {
549 mad_snoop_priv = container_of(mad_agent,
550 struct ib_mad_snoop_private,
551 agent);
552 unregister_mad_snoop(mad_snoop_priv);
553 }
554 return 0;
555 }
556 EXPORT_SYMBOL(ib_unregister_mad_agent);
557
558 static inline int response_mad(struct ib_mad *mad)
559 {
560 /* Trap represses are responses although response bit is reset */
561 return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
562 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
563 }
564
565 static void dequeue_mad(struct ib_mad_list_head *mad_list)
566 {
567 struct ib_mad_queue *mad_queue;
568 unsigned long flags;
569
570 BUG_ON(!mad_list->mad_queue);
571 mad_queue = mad_list->mad_queue;
572 spin_lock_irqsave(&mad_queue->lock, flags);
573 list_del(&mad_list->list);
574 mad_queue->count--;
575 spin_unlock_irqrestore(&mad_queue->lock, flags);
576 }
577
578 static void snoop_send(struct ib_mad_qp_info *qp_info,
579 struct ib_mad_send_buf *send_buf,
580 struct ib_mad_send_wc *mad_send_wc,
581 int mad_snoop_flags)
582 {
583 struct ib_mad_snoop_private *mad_snoop_priv;
584 unsigned long flags;
585 int i;
586
587 spin_lock_irqsave(&qp_info->snoop_lock, flags);
588 for (i = 0; i < qp_info->snoop_table_size; i++) {
589 mad_snoop_priv = qp_info->snoop_table[i];
590 if (!mad_snoop_priv ||
591 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
592 continue;
593
594 atomic_inc(&mad_snoop_priv->refcount);
595 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
596 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
597 send_buf, mad_send_wc);
598 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
599 wake_up(&mad_snoop_priv->wait);
600 spin_lock_irqsave(&qp_info->snoop_lock, flags);
601 }
602 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
603 }
604
605 static void snoop_recv(struct ib_mad_qp_info *qp_info,
606 struct ib_mad_recv_wc *mad_recv_wc,
607 int mad_snoop_flags)
608 {
609 struct ib_mad_snoop_private *mad_snoop_priv;
610 unsigned long flags;
611 int i;
612
613 spin_lock_irqsave(&qp_info->snoop_lock, flags);
614 for (i = 0; i < qp_info->snoop_table_size; i++) {
615 mad_snoop_priv = qp_info->snoop_table[i];
616 if (!mad_snoop_priv ||
617 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
618 continue;
619
620 atomic_inc(&mad_snoop_priv->refcount);
621 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
622 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
623 mad_recv_wc);
624 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
625 wake_up(&mad_snoop_priv->wait);
626 spin_lock_irqsave(&qp_info->snoop_lock, flags);
627 }
628 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
629 }
630
631 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
632 struct ib_wc *wc)
633 {
634 memset(wc, 0, sizeof *wc);
635 wc->wr_id = wr_id;
636 wc->status = IB_WC_SUCCESS;
637 wc->opcode = IB_WC_RECV;
638 wc->pkey_index = pkey_index;
639 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
640 wc->src_qp = IB_QP0;
641 wc->qp_num = IB_QP0;
642 wc->slid = slid;
643 wc->sl = 0;
644 wc->dlid_path_bits = 0;
645 wc->port_num = port_num;
646 }
647
648 /*
649 * Return 0 if SMP is to be sent
650 * Return 1 if SMP was consumed locally (whether or not solicited)
651 * Return < 0 if error
652 */
653 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
654 struct ib_mad_send_wr_private *mad_send_wr)
655 {
656 int ret;
657 struct ib_smp *smp = mad_send_wr->send_buf.mad;
658 unsigned long flags;
659 struct ib_mad_local_private *local;
660 struct ib_mad_private *mad_priv;
661 struct ib_mad_port_private *port_priv;
662 struct ib_mad_agent_private *recv_mad_agent = NULL;
663 struct ib_device *device = mad_agent_priv->agent.device;
664 u8 port_num = mad_agent_priv->agent.port_num;
665 struct ib_wc mad_wc;
666 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
667
668 if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
669 ret = -EINVAL;
670 printk(KERN_ERR PFX "Invalid directed route\n");
671 goto out;
672 }
673 /* Check to post send on QP or process locally */
674 ret = smi_check_local_dr_smp(smp, device, port_num);
675 if (!ret || !device->process_mad)
676 goto out;
677
678 local = kmalloc(sizeof *local, GFP_ATOMIC);
679 if (!local) {
680 ret = -ENOMEM;
681 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
682 goto out;
683 }
684 local->mad_priv = NULL;
685 local->recv_mad_agent = NULL;
686 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
687 if (!mad_priv) {
688 ret = -ENOMEM;
689 printk(KERN_ERR PFX "No memory for local response MAD\n");
690 kfree(local);
691 goto out;
692 }
693
694 build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
695 send_wr->wr.ud.pkey_index,
696 send_wr->wr.ud.port_num, &mad_wc);
697
698 /* No GRH for DR SMP */
699 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
700 (struct ib_mad *)smp,
701 (struct ib_mad *)&mad_priv->mad);
702 switch (ret)
703 {
704 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
705 if (response_mad(&mad_priv->mad.mad) &&
706 mad_agent_priv->agent.recv_handler) {
707 local->mad_priv = mad_priv;
708 local->recv_mad_agent = mad_agent_priv;
709 /*
710 * Reference MAD agent until receive
711 * side of local completion handled
712 */
713 atomic_inc(&mad_agent_priv->refcount);
714 } else
715 kmem_cache_free(ib_mad_cache, mad_priv);
716 break;
717 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
718 kmem_cache_free(ib_mad_cache, mad_priv);
719 break;
720 case IB_MAD_RESULT_SUCCESS:
721 /* Treat like an incoming receive MAD */
722 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
723 mad_agent_priv->agent.port_num);
724 if (port_priv) {
725 mad_priv->mad.mad.mad_hdr.tid =
726 ((struct ib_mad *)smp)->mad_hdr.tid;
727 recv_mad_agent = find_mad_agent(port_priv,
728 &mad_priv->mad.mad);
729 }
730 if (!port_priv || !recv_mad_agent) {
731 kmem_cache_free(ib_mad_cache, mad_priv);
732 kfree(local);
733 ret = 0;
734 goto out;
735 }
736 local->mad_priv = mad_priv;
737 local->recv_mad_agent = recv_mad_agent;
738 break;
739 default:
740 kmem_cache_free(ib_mad_cache, mad_priv);
741 kfree(local);
742 ret = -EINVAL;
743 goto out;
744 }
745
746 local->mad_send_wr = mad_send_wr;
747 /* Reference MAD agent until send side of local completion handled */
748 atomic_inc(&mad_agent_priv->refcount);
749 /* Queue local completion to local list */
750 spin_lock_irqsave(&mad_agent_priv->lock, flags);
751 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
752 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
753 queue_work(mad_agent_priv->qp_info->port_priv->wq,
754 &mad_agent_priv->local_work);
755 ret = 1;
756 out:
757 return ret;
758 }
759
760 static int get_buf_length(int hdr_len, int data_len)
761 {
762 int seg_size, pad;
763
764 seg_size = sizeof(struct ib_mad) - hdr_len;
765 if (data_len && seg_size) {
766 pad = seg_size - data_len % seg_size;
767 if (pad == seg_size)
768 pad = 0;
769 } else
770 pad = seg_size;
771 return hdr_len + data_len + pad;
772 }
773
774 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
775 u32 remote_qpn, u16 pkey_index,
776 int rmpp_active,
777 int hdr_len, int data_len,
778 gfp_t gfp_mask)
779 {
780 struct ib_mad_agent_private *mad_agent_priv;
781 struct ib_mad_send_wr_private *mad_send_wr;
782 int buf_size;
783 void *buf;
784
785 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
786 agent);
787 buf_size = get_buf_length(hdr_len, data_len);
788
789 if ((!mad_agent->rmpp_version &&
790 (rmpp_active || buf_size > sizeof(struct ib_mad))) ||
791 (!rmpp_active && buf_size > sizeof(struct ib_mad)))
792 return ERR_PTR(-EINVAL);
793
794 buf = kzalloc(sizeof *mad_send_wr + buf_size, gfp_mask);
795 if (!buf)
796 return ERR_PTR(-ENOMEM);
797
798 mad_send_wr = buf + buf_size;
799 mad_send_wr->send_buf.mad = buf;
800
801 mad_send_wr->mad_agent_priv = mad_agent_priv;
802 mad_send_wr->sg_list[0].length = buf_size;
803 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
804
805 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
806 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
807 mad_send_wr->send_wr.num_sge = 1;
808 mad_send_wr->send_wr.opcode = IB_WR_SEND;
809 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
810 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
811 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
812 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
813
814 if (rmpp_active) {
815 struct ib_rmpp_mad *rmpp_mad = mad_send_wr->send_buf.mad;
816 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(hdr_len -
817 IB_MGMT_RMPP_HDR + data_len);
818 rmpp_mad->rmpp_hdr.rmpp_version = mad_agent->rmpp_version;
819 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
820 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr,
821 IB_MGMT_RMPP_FLAG_ACTIVE);
822 }
823
824 mad_send_wr->send_buf.mad_agent = mad_agent;
825 atomic_inc(&mad_agent_priv->refcount);
826 return &mad_send_wr->send_buf;
827 }
828 EXPORT_SYMBOL(ib_create_send_mad);
829
830 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
831 {
832 struct ib_mad_agent_private *mad_agent_priv;
833
834 mad_agent_priv = container_of(send_buf->mad_agent,
835 struct ib_mad_agent_private, agent);
836 kfree(send_buf->mad);
837
838 if (atomic_dec_and_test(&mad_agent_priv->refcount))
839 wake_up(&mad_agent_priv->wait);
840 }
841 EXPORT_SYMBOL(ib_free_send_mad);
842
843 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
844 {
845 struct ib_mad_qp_info *qp_info;
846 struct list_head *list;
847 struct ib_send_wr *bad_send_wr;
848 struct ib_mad_agent *mad_agent;
849 struct ib_sge *sge;
850 unsigned long flags;
851 int ret;
852
853 /* Set WR ID to find mad_send_wr upon completion */
854 qp_info = mad_send_wr->mad_agent_priv->qp_info;
855 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
856 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
857
858 mad_agent = mad_send_wr->send_buf.mad_agent;
859 sge = mad_send_wr->sg_list;
860 sge->addr = dma_map_single(mad_agent->device->dma_device,
861 mad_send_wr->send_buf.mad, sge->length,
862 DMA_TO_DEVICE);
863 pci_unmap_addr_set(mad_send_wr, mapping, sge->addr);
864
865 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
866 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
867 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
868 &bad_send_wr);
869 list = &qp_info->send_queue.list;
870 } else {
871 ret = 0;
872 list = &qp_info->overflow_list;
873 }
874
875 if (!ret) {
876 qp_info->send_queue.count++;
877 list_add_tail(&mad_send_wr->mad_list.list, list);
878 }
879 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
880 if (ret)
881 dma_unmap_single(mad_agent->device->dma_device,
882 pci_unmap_addr(mad_send_wr, mapping),
883 sge->length, DMA_TO_DEVICE);
884
885 return ret;
886 }
887
888 /*
889 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
890 * with the registered client
891 */
892 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
893 struct ib_mad_send_buf **bad_send_buf)
894 {
895 struct ib_mad_agent_private *mad_agent_priv;
896 struct ib_mad_send_buf *next_send_buf;
897 struct ib_mad_send_wr_private *mad_send_wr;
898 unsigned long flags;
899 int ret = -EINVAL;
900
901 /* Walk list of send WRs and post each on send list */
902 for (; send_buf; send_buf = next_send_buf) {
903
904 mad_send_wr = container_of(send_buf,
905 struct ib_mad_send_wr_private,
906 send_buf);
907 mad_agent_priv = mad_send_wr->mad_agent_priv;
908
909 if (!send_buf->mad_agent->send_handler ||
910 (send_buf->timeout_ms &&
911 !send_buf->mad_agent->recv_handler)) {
912 ret = -EINVAL;
913 goto error;
914 }
915
916 /*
917 * Save pointer to next work request to post in case the
918 * current one completes, and the user modifies the work
919 * request associated with the completion
920 */
921 next_send_buf = send_buf->next;
922 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
923
924 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
925 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
926 ret = handle_outgoing_dr_smp(mad_agent_priv,
927 mad_send_wr);
928 if (ret < 0) /* error */
929 goto error;
930 else if (ret == 1) /* locally consumed */
931 continue;
932 }
933
934 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
935 /* Timeout will be updated after send completes */
936 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
937 mad_send_wr->retries = send_buf->retries;
938 /* Reference for work request to QP + response */
939 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
940 mad_send_wr->status = IB_WC_SUCCESS;
941
942 /* Reference MAD agent until send completes */
943 atomic_inc(&mad_agent_priv->refcount);
944 spin_lock_irqsave(&mad_agent_priv->lock, flags);
945 list_add_tail(&mad_send_wr->agent_list,
946 &mad_agent_priv->send_list);
947 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
948
949 if (mad_agent_priv->agent.rmpp_version) {
950 ret = ib_send_rmpp_mad(mad_send_wr);
951 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
952 ret = ib_send_mad(mad_send_wr);
953 } else
954 ret = ib_send_mad(mad_send_wr);
955 if (ret < 0) {
956 /* Fail send request */
957 spin_lock_irqsave(&mad_agent_priv->lock, flags);
958 list_del(&mad_send_wr->agent_list);
959 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
960 atomic_dec(&mad_agent_priv->refcount);
961 goto error;
962 }
963 }
964 return 0;
965 error:
966 if (bad_send_buf)
967 *bad_send_buf = send_buf;
968 return ret;
969 }
970 EXPORT_SYMBOL(ib_post_send_mad);
971
972 /*
973 * ib_free_recv_mad - Returns data buffers used to receive
974 * a MAD to the access layer
975 */
976 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
977 {
978 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
979 struct ib_mad_private_header *mad_priv_hdr;
980 struct ib_mad_private *priv;
981 struct list_head free_list;
982
983 INIT_LIST_HEAD(&free_list);
984 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
985
986 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
987 &free_list, list) {
988 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
989 recv_buf);
990 mad_priv_hdr = container_of(mad_recv_wc,
991 struct ib_mad_private_header,
992 recv_wc);
993 priv = container_of(mad_priv_hdr, struct ib_mad_private,
994 header);
995 kmem_cache_free(ib_mad_cache, priv);
996 }
997 }
998 EXPORT_SYMBOL(ib_free_recv_mad);
999
1000 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1001 u8 rmpp_version,
1002 ib_mad_send_handler send_handler,
1003 ib_mad_recv_handler recv_handler,
1004 void *context)
1005 {
1006 return ERR_PTR(-EINVAL); /* XXX: for now */
1007 }
1008 EXPORT_SYMBOL(ib_redirect_mad_qp);
1009
1010 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1011 struct ib_wc *wc)
1012 {
1013 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1014 return 0;
1015 }
1016 EXPORT_SYMBOL(ib_process_mad_wc);
1017
1018 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1019 struct ib_mad_reg_req *mad_reg_req)
1020 {
1021 int i;
1022
1023 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1024 i < IB_MGMT_MAX_METHODS;
1025 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1026 1+i)) {
1027 if ((*method)->agent[i]) {
1028 printk(KERN_ERR PFX "Method %d already in use\n", i);
1029 return -EINVAL;
1030 }
1031 }
1032 return 0;
1033 }
1034
1035 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1036 {
1037 /* Allocate management method table */
1038 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1039 if (!*method) {
1040 printk(KERN_ERR PFX "No memory for "
1041 "ib_mad_mgmt_method_table\n");
1042 return -ENOMEM;
1043 }
1044
1045 return 0;
1046 }
1047
1048 /*
1049 * Check to see if there are any methods still in use
1050 */
1051 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1052 {
1053 int i;
1054
1055 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1056 if (method->agent[i])
1057 return 1;
1058 return 0;
1059 }
1060
1061 /*
1062 * Check to see if there are any method tables for this class still in use
1063 */
1064 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1065 {
1066 int i;
1067
1068 for (i = 0; i < MAX_MGMT_CLASS; i++)
1069 if (class->method_table[i])
1070 return 1;
1071 return 0;
1072 }
1073
1074 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1075 {
1076 int i;
1077
1078 for (i = 0; i < MAX_MGMT_OUI; i++)
1079 if (vendor_class->method_table[i])
1080 return 1;
1081 return 0;
1082 }
1083
1084 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1085 char *oui)
1086 {
1087 int i;
1088
1089 for (i = 0; i < MAX_MGMT_OUI; i++)
1090 /* Is there matching OUI for this vendor class ? */
1091 if (!memcmp(vendor_class->oui[i], oui, 3))
1092 return i;
1093
1094 return -1;
1095 }
1096
1097 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1098 {
1099 int i;
1100
1101 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1102 if (vendor->vendor_class[i])
1103 return 1;
1104
1105 return 0;
1106 }
1107
1108 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1109 struct ib_mad_agent_private *agent)
1110 {
1111 int i;
1112
1113 /* Remove any methods for this mad agent */
1114 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1115 if (method->agent[i] == agent) {
1116 method->agent[i] = NULL;
1117 }
1118 }
1119 }
1120
1121 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1122 struct ib_mad_agent_private *agent_priv,
1123 u8 mgmt_class)
1124 {
1125 struct ib_mad_port_private *port_priv;
1126 struct ib_mad_mgmt_class_table **class;
1127 struct ib_mad_mgmt_method_table **method;
1128 int i, ret;
1129
1130 port_priv = agent_priv->qp_info->port_priv;
1131 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1132 if (!*class) {
1133 /* Allocate management class table for "new" class version */
1134 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1135 if (!*class) {
1136 printk(KERN_ERR PFX "No memory for "
1137 "ib_mad_mgmt_class_table\n");
1138 ret = -ENOMEM;
1139 goto error1;
1140 }
1141
1142 /* Allocate method table for this management class */
1143 method = &(*class)->method_table[mgmt_class];
1144 if ((ret = allocate_method_table(method)))
1145 goto error2;
1146 } else {
1147 method = &(*class)->method_table[mgmt_class];
1148 if (!*method) {
1149 /* Allocate method table for this management class */
1150 if ((ret = allocate_method_table(method)))
1151 goto error1;
1152 }
1153 }
1154
1155 /* Now, make sure methods are not already in use */
1156 if (method_in_use(method, mad_reg_req))
1157 goto error3;
1158
1159 /* Finally, add in methods being registered */
1160 for (i = find_first_bit(mad_reg_req->method_mask,
1161 IB_MGMT_MAX_METHODS);
1162 i < IB_MGMT_MAX_METHODS;
1163 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1164 1+i)) {
1165 (*method)->agent[i] = agent_priv;
1166 }
1167 return 0;
1168
1169 error3:
1170 /* Remove any methods for this mad agent */
1171 remove_methods_mad_agent(*method, agent_priv);
1172 /* Now, check to see if there are any methods in use */
1173 if (!check_method_table(*method)) {
1174 /* If not, release management method table */
1175 kfree(*method);
1176 *method = NULL;
1177 }
1178 ret = -EINVAL;
1179 goto error1;
1180 error2:
1181 kfree(*class);
1182 *class = NULL;
1183 error1:
1184 return ret;
1185 }
1186
1187 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1188 struct ib_mad_agent_private *agent_priv)
1189 {
1190 struct ib_mad_port_private *port_priv;
1191 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1192 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1193 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1194 struct ib_mad_mgmt_method_table **method;
1195 int i, ret = -ENOMEM;
1196 u8 vclass;
1197
1198 /* "New" vendor (with OUI) class */
1199 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1200 port_priv = agent_priv->qp_info->port_priv;
1201 vendor_table = &port_priv->version[
1202 mad_reg_req->mgmt_class_version].vendor;
1203 if (!*vendor_table) {
1204 /* Allocate mgmt vendor class table for "new" class version */
1205 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1206 if (!vendor) {
1207 printk(KERN_ERR PFX "No memory for "
1208 "ib_mad_mgmt_vendor_class_table\n");
1209 goto error1;
1210 }
1211
1212 *vendor_table = vendor;
1213 }
1214 if (!(*vendor_table)->vendor_class[vclass]) {
1215 /* Allocate table for this management vendor class */
1216 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1217 if (!vendor_class) {
1218 printk(KERN_ERR PFX "No memory for "
1219 "ib_mad_mgmt_vendor_class\n");
1220 goto error2;
1221 }
1222
1223 (*vendor_table)->vendor_class[vclass] = vendor_class;
1224 }
1225 for (i = 0; i < MAX_MGMT_OUI; i++) {
1226 /* Is there matching OUI for this vendor class ? */
1227 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1228 mad_reg_req->oui, 3)) {
1229 method = &(*vendor_table)->vendor_class[
1230 vclass]->method_table[i];
1231 BUG_ON(!*method);
1232 goto check_in_use;
1233 }
1234 }
1235 for (i = 0; i < MAX_MGMT_OUI; i++) {
1236 /* OUI slot available ? */
1237 if (!is_vendor_oui((*vendor_table)->vendor_class[
1238 vclass]->oui[i])) {
1239 method = &(*vendor_table)->vendor_class[
1240 vclass]->method_table[i];
1241 BUG_ON(*method);
1242 /* Allocate method table for this OUI */
1243 if ((ret = allocate_method_table(method)))
1244 goto error3;
1245 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1246 mad_reg_req->oui, 3);
1247 goto check_in_use;
1248 }
1249 }
1250 printk(KERN_ERR PFX "All OUI slots in use\n");
1251 goto error3;
1252
1253 check_in_use:
1254 /* Now, make sure methods are not already in use */
1255 if (method_in_use(method, mad_reg_req))
1256 goto error4;
1257
1258 /* Finally, add in methods being registered */
1259 for (i = find_first_bit(mad_reg_req->method_mask,
1260 IB_MGMT_MAX_METHODS);
1261 i < IB_MGMT_MAX_METHODS;
1262 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1263 1+i)) {
1264 (*method)->agent[i] = agent_priv;
1265 }
1266 return 0;
1267
1268 error4:
1269 /* Remove any methods for this mad agent */
1270 remove_methods_mad_agent(*method, agent_priv);
1271 /* Now, check to see if there are any methods in use */
1272 if (!check_method_table(*method)) {
1273 /* If not, release management method table */
1274 kfree(*method);
1275 *method = NULL;
1276 }
1277 ret = -EINVAL;
1278 error3:
1279 if (vendor_class) {
1280 (*vendor_table)->vendor_class[vclass] = NULL;
1281 kfree(vendor_class);
1282 }
1283 error2:
1284 if (vendor) {
1285 *vendor_table = NULL;
1286 kfree(vendor);
1287 }
1288 error1:
1289 return ret;
1290 }
1291
1292 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1293 {
1294 struct ib_mad_port_private *port_priv;
1295 struct ib_mad_mgmt_class_table *class;
1296 struct ib_mad_mgmt_method_table *method;
1297 struct ib_mad_mgmt_vendor_class_table *vendor;
1298 struct ib_mad_mgmt_vendor_class *vendor_class;
1299 int index;
1300 u8 mgmt_class;
1301
1302 /*
1303 * Was MAD registration request supplied
1304 * with original registration ?
1305 */
1306 if (!agent_priv->reg_req) {
1307 goto out;
1308 }
1309
1310 port_priv = agent_priv->qp_info->port_priv;
1311 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1312 class = port_priv->version[
1313 agent_priv->reg_req->mgmt_class_version].class;
1314 if (!class)
1315 goto vendor_check;
1316
1317 method = class->method_table[mgmt_class];
1318 if (method) {
1319 /* Remove any methods for this mad agent */
1320 remove_methods_mad_agent(method, agent_priv);
1321 /* Now, check to see if there are any methods still in use */
1322 if (!check_method_table(method)) {
1323 /* If not, release management method table */
1324 kfree(method);
1325 class->method_table[mgmt_class] = NULL;
1326 /* Any management classes left ? */
1327 if (!check_class_table(class)) {
1328 /* If not, release management class table */
1329 kfree(class);
1330 port_priv->version[
1331 agent_priv->reg_req->
1332 mgmt_class_version].class = NULL;
1333 }
1334 }
1335 }
1336
1337 vendor_check:
1338 if (!is_vendor_class(mgmt_class))
1339 goto out;
1340
1341 /* normalize mgmt_class to vendor range 2 */
1342 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1343 vendor = port_priv->version[
1344 agent_priv->reg_req->mgmt_class_version].vendor;
1345
1346 if (!vendor)
1347 goto out;
1348
1349 vendor_class = vendor->vendor_class[mgmt_class];
1350 if (vendor_class) {
1351 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1352 if (index < 0)
1353 goto out;
1354 method = vendor_class->method_table[index];
1355 if (method) {
1356 /* Remove any methods for this mad agent */
1357 remove_methods_mad_agent(method, agent_priv);
1358 /*
1359 * Now, check to see if there are
1360 * any methods still in use
1361 */
1362 if (!check_method_table(method)) {
1363 /* If not, release management method table */
1364 kfree(method);
1365 vendor_class->method_table[index] = NULL;
1366 memset(vendor_class->oui[index], 0, 3);
1367 /* Any OUIs left ? */
1368 if (!check_vendor_class(vendor_class)) {
1369 /* If not, release vendor class table */
1370 kfree(vendor_class);
1371 vendor->vendor_class[mgmt_class] = NULL;
1372 /* Any other vendor classes left ? */
1373 if (!check_vendor_table(vendor)) {
1374 kfree(vendor);
1375 port_priv->version[
1376 agent_priv->reg_req->
1377 mgmt_class_version].
1378 vendor = NULL;
1379 }
1380 }
1381 }
1382 }
1383 }
1384
1385 out:
1386 return;
1387 }
1388
1389 static struct ib_mad_agent_private *
1390 find_mad_agent(struct ib_mad_port_private *port_priv,
1391 struct ib_mad *mad)
1392 {
1393 struct ib_mad_agent_private *mad_agent = NULL;
1394 unsigned long flags;
1395
1396 spin_lock_irqsave(&port_priv->reg_lock, flags);
1397 if (response_mad(mad)) {
1398 u32 hi_tid;
1399 struct ib_mad_agent_private *entry;
1400
1401 /*
1402 * Routing is based on high 32 bits of transaction ID
1403 * of MAD.
1404 */
1405 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1406 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1407 if (entry->agent.hi_tid == hi_tid) {
1408 mad_agent = entry;
1409 break;
1410 }
1411 }
1412 } else {
1413 struct ib_mad_mgmt_class_table *class;
1414 struct ib_mad_mgmt_method_table *method;
1415 struct ib_mad_mgmt_vendor_class_table *vendor;
1416 struct ib_mad_mgmt_vendor_class *vendor_class;
1417 struct ib_vendor_mad *vendor_mad;
1418 int index;
1419
1420 /*
1421 * Routing is based on version, class, and method
1422 * For "newer" vendor MADs, also based on OUI
1423 */
1424 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1425 goto out;
1426 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1427 class = port_priv->version[
1428 mad->mad_hdr.class_version].class;
1429 if (!class)
1430 goto out;
1431 method = class->method_table[convert_mgmt_class(
1432 mad->mad_hdr.mgmt_class)];
1433 if (method)
1434 mad_agent = method->agent[mad->mad_hdr.method &
1435 ~IB_MGMT_METHOD_RESP];
1436 } else {
1437 vendor = port_priv->version[
1438 mad->mad_hdr.class_version].vendor;
1439 if (!vendor)
1440 goto out;
1441 vendor_class = vendor->vendor_class[vendor_class_index(
1442 mad->mad_hdr.mgmt_class)];
1443 if (!vendor_class)
1444 goto out;
1445 /* Find matching OUI */
1446 vendor_mad = (struct ib_vendor_mad *)mad;
1447 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1448 if (index == -1)
1449 goto out;
1450 method = vendor_class->method_table[index];
1451 if (method) {
1452 mad_agent = method->agent[mad->mad_hdr.method &
1453 ~IB_MGMT_METHOD_RESP];
1454 }
1455 }
1456 }
1457
1458 if (mad_agent) {
1459 if (mad_agent->agent.recv_handler)
1460 atomic_inc(&mad_agent->refcount);
1461 else {
1462 printk(KERN_NOTICE PFX "No receive handler for client "
1463 "%p on port %d\n",
1464 &mad_agent->agent, port_priv->port_num);
1465 mad_agent = NULL;
1466 }
1467 }
1468 out:
1469 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1470
1471 return mad_agent;
1472 }
1473
1474 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1475 {
1476 int valid = 0;
1477
1478 /* Make sure MAD base version is understood */
1479 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1480 printk(KERN_ERR PFX "MAD received with unsupported base "
1481 "version %d\n", mad->mad_hdr.base_version);
1482 goto out;
1483 }
1484
1485 /* Filter SMI packets sent to other than QP0 */
1486 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1487 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1488 if (qp_num == 0)
1489 valid = 1;
1490 } else {
1491 /* Filter GSI packets sent to QP0 */
1492 if (qp_num != 0)
1493 valid = 1;
1494 }
1495
1496 out:
1497 return valid;
1498 }
1499
1500 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1501 struct ib_mad_hdr *mad_hdr)
1502 {
1503 struct ib_rmpp_mad *rmpp_mad;
1504
1505 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1506 return !mad_agent_priv->agent.rmpp_version ||
1507 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1508 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1509 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1510 }
1511
1512 struct ib_mad_send_wr_private*
1513 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, __be64 tid)
1514 {
1515 struct ib_mad_send_wr_private *mad_send_wr;
1516
1517 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1518 agent_list) {
1519 if (mad_send_wr->tid == tid)
1520 return mad_send_wr;
1521 }
1522
1523 /*
1524 * It's possible to receive the response before we've
1525 * been notified that the send has completed
1526 */
1527 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1528 agent_list) {
1529 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
1530 mad_send_wr->tid == tid && mad_send_wr->timeout) {
1531 /* Verify request has not been canceled */
1532 return (mad_send_wr->status == IB_WC_SUCCESS) ?
1533 mad_send_wr : NULL;
1534 }
1535 }
1536 return NULL;
1537 }
1538
1539 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1540 {
1541 mad_send_wr->timeout = 0;
1542 if (mad_send_wr->refcount == 1) {
1543 list_del(&mad_send_wr->agent_list);
1544 list_add_tail(&mad_send_wr->agent_list,
1545 &mad_send_wr->mad_agent_priv->done_list);
1546 }
1547 }
1548
1549 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1550 struct ib_mad_recv_wc *mad_recv_wc)
1551 {
1552 struct ib_mad_send_wr_private *mad_send_wr;
1553 struct ib_mad_send_wc mad_send_wc;
1554 unsigned long flags;
1555 __be64 tid;
1556
1557 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1558 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1559 if (mad_agent_priv->agent.rmpp_version) {
1560 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1561 mad_recv_wc);
1562 if (!mad_recv_wc) {
1563 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1564 wake_up(&mad_agent_priv->wait);
1565 return;
1566 }
1567 }
1568
1569 /* Complete corresponding request */
1570 if (response_mad(mad_recv_wc->recv_buf.mad)) {
1571 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1572 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1573 mad_send_wr = ib_find_send_mad(mad_agent_priv, tid);
1574 if (!mad_send_wr) {
1575 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1576 ib_free_recv_mad(mad_recv_wc);
1577 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1578 wake_up(&mad_agent_priv->wait);
1579 return;
1580 }
1581 ib_mark_mad_done(mad_send_wr);
1582 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1583
1584 /* Defined behavior is to complete response before request */
1585 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1586 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1587 mad_recv_wc);
1588 atomic_dec(&mad_agent_priv->refcount);
1589
1590 mad_send_wc.status = IB_WC_SUCCESS;
1591 mad_send_wc.vendor_err = 0;
1592 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1593 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1594 } else {
1595 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1596 mad_recv_wc);
1597 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1598 wake_up(&mad_agent_priv->wait);
1599 }
1600 }
1601
1602 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1603 struct ib_wc *wc)
1604 {
1605 struct ib_mad_qp_info *qp_info;
1606 struct ib_mad_private_header *mad_priv_hdr;
1607 struct ib_mad_private *recv, *response;
1608 struct ib_mad_list_head *mad_list;
1609 struct ib_mad_agent_private *mad_agent;
1610
1611 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1612 if (!response)
1613 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1614 "for response buffer\n");
1615
1616 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1617 qp_info = mad_list->mad_queue->qp_info;
1618 dequeue_mad(mad_list);
1619
1620 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1621 mad_list);
1622 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1623 dma_unmap_single(port_priv->device->dma_device,
1624 pci_unmap_addr(&recv->header, mapping),
1625 sizeof(struct ib_mad_private) -
1626 sizeof(struct ib_mad_private_header),
1627 DMA_FROM_DEVICE);
1628
1629 /* Setup MAD receive work completion from "normal" work completion */
1630 recv->header.wc = *wc;
1631 recv->header.recv_wc.wc = &recv->header.wc;
1632 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1633 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1634 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1635
1636 if (atomic_read(&qp_info->snoop_count))
1637 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1638
1639 /* Validate MAD */
1640 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1641 goto out;
1642
1643 if (recv->mad.mad.mad_hdr.mgmt_class ==
1644 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1645 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1646 port_priv->device->node_type,
1647 port_priv->port_num,
1648 port_priv->device->phys_port_cnt))
1649 goto out;
1650 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1651 goto local;
1652 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1653 port_priv->device->node_type,
1654 port_priv->port_num))
1655 goto out;
1656 if (!smi_check_local_dr_smp(&recv->mad.smp,
1657 port_priv->device,
1658 port_priv->port_num))
1659 goto out;
1660 }
1661
1662 local:
1663 /* Give driver "right of first refusal" on incoming MAD */
1664 if (port_priv->device->process_mad) {
1665 int ret;
1666
1667 if (!response) {
1668 printk(KERN_ERR PFX "No memory for response MAD\n");
1669 /*
1670 * Is it better to assume that
1671 * it wouldn't be processed ?
1672 */
1673 goto out;
1674 }
1675
1676 ret = port_priv->device->process_mad(port_priv->device, 0,
1677 port_priv->port_num,
1678 wc, &recv->grh,
1679 &recv->mad.mad,
1680 &response->mad.mad);
1681 if (ret & IB_MAD_RESULT_SUCCESS) {
1682 if (ret & IB_MAD_RESULT_CONSUMED)
1683 goto out;
1684 if (ret & IB_MAD_RESULT_REPLY) {
1685 agent_send_response(&response->mad.mad,
1686 &recv->grh, wc,
1687 port_priv->device,
1688 port_priv->port_num,
1689 qp_info->qp->qp_num);
1690 goto out;
1691 }
1692 }
1693 }
1694
1695 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1696 if (mad_agent) {
1697 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1698 /*
1699 * recv is freed up in error cases in ib_mad_complete_recv
1700 * or via recv_handler in ib_mad_complete_recv()
1701 */
1702 recv = NULL;
1703 }
1704
1705 out:
1706 /* Post another receive request for this QP */
1707 if (response) {
1708 ib_mad_post_receive_mads(qp_info, response);
1709 if (recv)
1710 kmem_cache_free(ib_mad_cache, recv);
1711 } else
1712 ib_mad_post_receive_mads(qp_info, recv);
1713 }
1714
1715 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1716 {
1717 struct ib_mad_send_wr_private *mad_send_wr;
1718 unsigned long delay;
1719
1720 if (list_empty(&mad_agent_priv->wait_list)) {
1721 cancel_delayed_work(&mad_agent_priv->timed_work);
1722 } else {
1723 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1724 struct ib_mad_send_wr_private,
1725 agent_list);
1726
1727 if (time_after(mad_agent_priv->timeout,
1728 mad_send_wr->timeout)) {
1729 mad_agent_priv->timeout = mad_send_wr->timeout;
1730 cancel_delayed_work(&mad_agent_priv->timed_work);
1731 delay = mad_send_wr->timeout - jiffies;
1732 if ((long)delay <= 0)
1733 delay = 1;
1734 queue_delayed_work(mad_agent_priv->qp_info->
1735 port_priv->wq,
1736 &mad_agent_priv->timed_work, delay);
1737 }
1738 }
1739 }
1740
1741 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1742 {
1743 struct ib_mad_agent_private *mad_agent_priv;
1744 struct ib_mad_send_wr_private *temp_mad_send_wr;
1745 struct list_head *list_item;
1746 unsigned long delay;
1747
1748 mad_agent_priv = mad_send_wr->mad_agent_priv;
1749 list_del(&mad_send_wr->agent_list);
1750
1751 delay = mad_send_wr->timeout;
1752 mad_send_wr->timeout += jiffies;
1753
1754 if (delay) {
1755 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1756 temp_mad_send_wr = list_entry(list_item,
1757 struct ib_mad_send_wr_private,
1758 agent_list);
1759 if (time_after(mad_send_wr->timeout,
1760 temp_mad_send_wr->timeout))
1761 break;
1762 }
1763 }
1764 else
1765 list_item = &mad_agent_priv->wait_list;
1766 list_add(&mad_send_wr->agent_list, list_item);
1767
1768 /* Reschedule a work item if we have a shorter timeout */
1769 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1770 cancel_delayed_work(&mad_agent_priv->timed_work);
1771 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1772 &mad_agent_priv->timed_work, delay);
1773 }
1774 }
1775
1776 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1777 int timeout_ms)
1778 {
1779 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1780 wait_for_response(mad_send_wr);
1781 }
1782
1783 /*
1784 * Process a send work completion
1785 */
1786 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1787 struct ib_mad_send_wc *mad_send_wc)
1788 {
1789 struct ib_mad_agent_private *mad_agent_priv;
1790 unsigned long flags;
1791 int ret;
1792
1793 mad_agent_priv = mad_send_wr->mad_agent_priv;
1794 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1795 if (mad_agent_priv->agent.rmpp_version) {
1796 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1797 if (ret == IB_RMPP_RESULT_CONSUMED)
1798 goto done;
1799 } else
1800 ret = IB_RMPP_RESULT_UNHANDLED;
1801
1802 if (mad_send_wc->status != IB_WC_SUCCESS &&
1803 mad_send_wr->status == IB_WC_SUCCESS) {
1804 mad_send_wr->status = mad_send_wc->status;
1805 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1806 }
1807
1808 if (--mad_send_wr->refcount > 0) {
1809 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1810 mad_send_wr->status == IB_WC_SUCCESS) {
1811 wait_for_response(mad_send_wr);
1812 }
1813 goto done;
1814 }
1815
1816 /* Remove send from MAD agent and notify client of completion */
1817 list_del(&mad_send_wr->agent_list);
1818 adjust_timeout(mad_agent_priv);
1819 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1820
1821 if (mad_send_wr->status != IB_WC_SUCCESS )
1822 mad_send_wc->status = mad_send_wr->status;
1823 if (ret == IB_RMPP_RESULT_INTERNAL)
1824 ib_rmpp_send_handler(mad_send_wc);
1825 else
1826 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1827 mad_send_wc);
1828
1829 /* Release reference on agent taken when sending */
1830 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1831 wake_up(&mad_agent_priv->wait);
1832 return;
1833 done:
1834 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1835 }
1836
1837 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1838 struct ib_wc *wc)
1839 {
1840 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
1841 struct ib_mad_list_head *mad_list;
1842 struct ib_mad_qp_info *qp_info;
1843 struct ib_mad_queue *send_queue;
1844 struct ib_send_wr *bad_send_wr;
1845 struct ib_mad_send_wc mad_send_wc;
1846 unsigned long flags;
1847 int ret;
1848
1849 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1850 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1851 mad_list);
1852 send_queue = mad_list->mad_queue;
1853 qp_info = send_queue->qp_info;
1854
1855 retry:
1856 dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
1857 pci_unmap_addr(mad_send_wr, mapping),
1858 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
1859 queued_send_wr = NULL;
1860 spin_lock_irqsave(&send_queue->lock, flags);
1861 list_del(&mad_list->list);
1862
1863 /* Move queued send to the send queue */
1864 if (send_queue->count-- > send_queue->max_active) {
1865 mad_list = container_of(qp_info->overflow_list.next,
1866 struct ib_mad_list_head, list);
1867 queued_send_wr = container_of(mad_list,
1868 struct ib_mad_send_wr_private,
1869 mad_list);
1870 list_del(&mad_list->list);
1871 list_add_tail(&mad_list->list, &send_queue->list);
1872 }
1873 spin_unlock_irqrestore(&send_queue->lock, flags);
1874
1875 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1876 mad_send_wc.status = wc->status;
1877 mad_send_wc.vendor_err = wc->vendor_err;
1878 if (atomic_read(&qp_info->snoop_count))
1879 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
1880 IB_MAD_SNOOP_SEND_COMPLETIONS);
1881 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1882
1883 if (queued_send_wr) {
1884 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1885 &bad_send_wr);
1886 if (ret) {
1887 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1888 mad_send_wr = queued_send_wr;
1889 wc->status = IB_WC_LOC_QP_OP_ERR;
1890 goto retry;
1891 }
1892 }
1893 }
1894
1895 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1896 {
1897 struct ib_mad_send_wr_private *mad_send_wr;
1898 struct ib_mad_list_head *mad_list;
1899 unsigned long flags;
1900
1901 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1902 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1903 mad_send_wr = container_of(mad_list,
1904 struct ib_mad_send_wr_private,
1905 mad_list);
1906 mad_send_wr->retry = 1;
1907 }
1908 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1909 }
1910
1911 static void mad_error_handler(struct ib_mad_port_private *port_priv,
1912 struct ib_wc *wc)
1913 {
1914 struct ib_mad_list_head *mad_list;
1915 struct ib_mad_qp_info *qp_info;
1916 struct ib_mad_send_wr_private *mad_send_wr;
1917 int ret;
1918
1919 /* Determine if failure was a send or receive */
1920 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1921 qp_info = mad_list->mad_queue->qp_info;
1922 if (mad_list->mad_queue == &qp_info->recv_queue)
1923 /*
1924 * Receive errors indicate that the QP has entered the error
1925 * state - error handling/shutdown code will cleanup
1926 */
1927 return;
1928
1929 /*
1930 * Send errors will transition the QP to SQE - move
1931 * QP to RTS and repost flushed work requests
1932 */
1933 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1934 mad_list);
1935 if (wc->status == IB_WC_WR_FLUSH_ERR) {
1936 if (mad_send_wr->retry) {
1937 /* Repost send */
1938 struct ib_send_wr *bad_send_wr;
1939
1940 mad_send_wr->retry = 0;
1941 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1942 &bad_send_wr);
1943 if (ret)
1944 ib_mad_send_done_handler(port_priv, wc);
1945 } else
1946 ib_mad_send_done_handler(port_priv, wc);
1947 } else {
1948 struct ib_qp_attr *attr;
1949
1950 /* Transition QP to RTS and fail offending send */
1951 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1952 if (attr) {
1953 attr->qp_state = IB_QPS_RTS;
1954 attr->cur_qp_state = IB_QPS_SQE;
1955 ret = ib_modify_qp(qp_info->qp, attr,
1956 IB_QP_STATE | IB_QP_CUR_STATE);
1957 kfree(attr);
1958 if (ret)
1959 printk(KERN_ERR PFX "mad_error_handler - "
1960 "ib_modify_qp to RTS : %d\n", ret);
1961 else
1962 mark_sends_for_retry(qp_info);
1963 }
1964 ib_mad_send_done_handler(port_priv, wc);
1965 }
1966 }
1967
1968 /*
1969 * IB MAD completion callback
1970 */
1971 static void ib_mad_completion_handler(void *data)
1972 {
1973 struct ib_mad_port_private *port_priv;
1974 struct ib_wc wc;
1975
1976 port_priv = (struct ib_mad_port_private *)data;
1977 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
1978
1979 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
1980 if (wc.status == IB_WC_SUCCESS) {
1981 switch (wc.opcode) {
1982 case IB_WC_SEND:
1983 ib_mad_send_done_handler(port_priv, &wc);
1984 break;
1985 case IB_WC_RECV:
1986 ib_mad_recv_done_handler(port_priv, &wc);
1987 break;
1988 default:
1989 BUG_ON(1);
1990 break;
1991 }
1992 } else
1993 mad_error_handler(port_priv, &wc);
1994 }
1995 }
1996
1997 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
1998 {
1999 unsigned long flags;
2000 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2001 struct ib_mad_send_wc mad_send_wc;
2002 struct list_head cancel_list;
2003
2004 INIT_LIST_HEAD(&cancel_list);
2005
2006 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2007 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2008 &mad_agent_priv->send_list, agent_list) {
2009 if (mad_send_wr->status == IB_WC_SUCCESS) {
2010 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2011 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2012 }
2013 }
2014
2015 /* Empty wait list to prevent receives from finding a request */
2016 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2017 /* Empty local completion list as well */
2018 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2019 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2020
2021 /* Report all cancelled requests */
2022 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2023 mad_send_wc.vendor_err = 0;
2024
2025 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2026 &cancel_list, agent_list) {
2027 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2028 list_del(&mad_send_wr->agent_list);
2029 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2030 &mad_send_wc);
2031 atomic_dec(&mad_agent_priv->refcount);
2032 }
2033 }
2034
2035 static struct ib_mad_send_wr_private*
2036 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2037 struct ib_mad_send_buf *send_buf)
2038 {
2039 struct ib_mad_send_wr_private *mad_send_wr;
2040
2041 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2042 agent_list) {
2043 if (&mad_send_wr->send_buf == send_buf)
2044 return mad_send_wr;
2045 }
2046
2047 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2048 agent_list) {
2049 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2050 &mad_send_wr->send_buf == send_buf)
2051 return mad_send_wr;
2052 }
2053 return NULL;
2054 }
2055
2056 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2057 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2058 {
2059 struct ib_mad_agent_private *mad_agent_priv;
2060 struct ib_mad_send_wr_private *mad_send_wr;
2061 unsigned long flags;
2062 int active;
2063
2064 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2065 agent);
2066 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2067 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2068 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2069 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2070 return -EINVAL;
2071 }
2072
2073 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2074 if (!timeout_ms) {
2075 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2076 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2077 }
2078
2079 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2080 if (active)
2081 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2082 else
2083 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2084
2085 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2086 return 0;
2087 }
2088 EXPORT_SYMBOL(ib_modify_mad);
2089
2090 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2091 struct ib_mad_send_buf *send_buf)
2092 {
2093 ib_modify_mad(mad_agent, send_buf, 0);
2094 }
2095 EXPORT_SYMBOL(ib_cancel_mad);
2096
2097 static void local_completions(void *data)
2098 {
2099 struct ib_mad_agent_private *mad_agent_priv;
2100 struct ib_mad_local_private *local;
2101 struct ib_mad_agent_private *recv_mad_agent;
2102 unsigned long flags;
2103 int recv = 0;
2104 struct ib_wc wc;
2105 struct ib_mad_send_wc mad_send_wc;
2106
2107 mad_agent_priv = (struct ib_mad_agent_private *)data;
2108
2109 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2110 while (!list_empty(&mad_agent_priv->local_list)) {
2111 local = list_entry(mad_agent_priv->local_list.next,
2112 struct ib_mad_local_private,
2113 completion_list);
2114 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2115 if (local->mad_priv) {
2116 recv_mad_agent = local->recv_mad_agent;
2117 if (!recv_mad_agent) {
2118 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2119 goto local_send_completion;
2120 }
2121
2122 recv = 1;
2123 /*
2124 * Defined behavior is to complete response
2125 * before request
2126 */
2127 build_smp_wc((unsigned long) local->mad_send_wr,
2128 be16_to_cpu(IB_LID_PERMISSIVE),
2129 0, recv_mad_agent->agent.port_num, &wc);
2130
2131 local->mad_priv->header.recv_wc.wc = &wc;
2132 local->mad_priv->header.recv_wc.mad_len =
2133 sizeof(struct ib_mad);
2134 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2135 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2136 &local->mad_priv->header.recv_wc.rmpp_list);
2137 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2138 local->mad_priv->header.recv_wc.recv_buf.mad =
2139 &local->mad_priv->mad.mad;
2140 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2141 snoop_recv(recv_mad_agent->qp_info,
2142 &local->mad_priv->header.recv_wc,
2143 IB_MAD_SNOOP_RECVS);
2144 recv_mad_agent->agent.recv_handler(
2145 &recv_mad_agent->agent,
2146 &local->mad_priv->header.recv_wc);
2147 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2148 atomic_dec(&recv_mad_agent->refcount);
2149 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2150 }
2151
2152 local_send_completion:
2153 /* Complete send */
2154 mad_send_wc.status = IB_WC_SUCCESS;
2155 mad_send_wc.vendor_err = 0;
2156 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2157 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2158 snoop_send(mad_agent_priv->qp_info,
2159 &local->mad_send_wr->send_buf,
2160 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2161 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2162 &mad_send_wc);
2163
2164 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2165 list_del(&local->completion_list);
2166 atomic_dec(&mad_agent_priv->refcount);
2167 if (!recv)
2168 kmem_cache_free(ib_mad_cache, local->mad_priv);
2169 kfree(local);
2170 }
2171 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2172 }
2173
2174 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2175 {
2176 int ret;
2177
2178 if (!mad_send_wr->retries--)
2179 return -ETIMEDOUT;
2180
2181 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2182
2183 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2184 ret = ib_retry_rmpp(mad_send_wr);
2185 switch (ret) {
2186 case IB_RMPP_RESULT_UNHANDLED:
2187 ret = ib_send_mad(mad_send_wr);
2188 break;
2189 case IB_RMPP_RESULT_CONSUMED:
2190 ret = 0;
2191 break;
2192 default:
2193 ret = -ECOMM;
2194 break;
2195 }
2196 } else
2197 ret = ib_send_mad(mad_send_wr);
2198
2199 if (!ret) {
2200 mad_send_wr->refcount++;
2201 list_add_tail(&mad_send_wr->agent_list,
2202 &mad_send_wr->mad_agent_priv->send_list);
2203 }
2204 return ret;
2205 }
2206
2207 static void timeout_sends(void *data)
2208 {
2209 struct ib_mad_agent_private *mad_agent_priv;
2210 struct ib_mad_send_wr_private *mad_send_wr;
2211 struct ib_mad_send_wc mad_send_wc;
2212 unsigned long flags, delay;
2213
2214 mad_agent_priv = (struct ib_mad_agent_private *)data;
2215 mad_send_wc.vendor_err = 0;
2216
2217 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2218 while (!list_empty(&mad_agent_priv->wait_list)) {
2219 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2220 struct ib_mad_send_wr_private,
2221 agent_list);
2222
2223 if (time_after(mad_send_wr->timeout, jiffies)) {
2224 delay = mad_send_wr->timeout - jiffies;
2225 if ((long)delay <= 0)
2226 delay = 1;
2227 queue_delayed_work(mad_agent_priv->qp_info->
2228 port_priv->wq,
2229 &mad_agent_priv->timed_work, delay);
2230 break;
2231 }
2232
2233 list_del(&mad_send_wr->agent_list);
2234 if (mad_send_wr->status == IB_WC_SUCCESS &&
2235 !retry_send(mad_send_wr))
2236 continue;
2237
2238 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2239
2240 if (mad_send_wr->status == IB_WC_SUCCESS)
2241 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2242 else
2243 mad_send_wc.status = mad_send_wr->status;
2244 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2245 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2246 &mad_send_wc);
2247
2248 atomic_dec(&mad_agent_priv->refcount);
2249 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2250 }
2251 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2252 }
2253
2254 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2255 {
2256 struct ib_mad_port_private *port_priv = cq->cq_context;
2257
2258 queue_work(port_priv->wq, &port_priv->work);
2259 }
2260
2261 /*
2262 * Allocate receive MADs and post receive WRs for them
2263 */
2264 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2265 struct ib_mad_private *mad)
2266 {
2267 unsigned long flags;
2268 int post, ret;
2269 struct ib_mad_private *mad_priv;
2270 struct ib_sge sg_list;
2271 struct ib_recv_wr recv_wr, *bad_recv_wr;
2272 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2273
2274 /* Initialize common scatter list fields */
2275 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2276 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2277
2278 /* Initialize common receive WR fields */
2279 recv_wr.next = NULL;
2280 recv_wr.sg_list = &sg_list;
2281 recv_wr.num_sge = 1;
2282
2283 do {
2284 /* Allocate and map receive buffer */
2285 if (mad) {
2286 mad_priv = mad;
2287 mad = NULL;
2288 } else {
2289 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2290 if (!mad_priv) {
2291 printk(KERN_ERR PFX "No memory for receive buffer\n");
2292 ret = -ENOMEM;
2293 break;
2294 }
2295 }
2296 sg_list.addr = dma_map_single(qp_info->port_priv->
2297 device->dma_device,
2298 &mad_priv->grh,
2299 sizeof *mad_priv -
2300 sizeof mad_priv->header,
2301 DMA_FROM_DEVICE);
2302 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2303 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2304 mad_priv->header.mad_list.mad_queue = recv_queue;
2305
2306 /* Post receive WR */
2307 spin_lock_irqsave(&recv_queue->lock, flags);
2308 post = (++recv_queue->count < recv_queue->max_active);
2309 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2310 spin_unlock_irqrestore(&recv_queue->lock, flags);
2311 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2312 if (ret) {
2313 spin_lock_irqsave(&recv_queue->lock, flags);
2314 list_del(&mad_priv->header.mad_list.list);
2315 recv_queue->count--;
2316 spin_unlock_irqrestore(&recv_queue->lock, flags);
2317 dma_unmap_single(qp_info->port_priv->device->dma_device,
2318 pci_unmap_addr(&mad_priv->header,
2319 mapping),
2320 sizeof *mad_priv -
2321 sizeof mad_priv->header,
2322 DMA_FROM_DEVICE);
2323 kmem_cache_free(ib_mad_cache, mad_priv);
2324 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2325 break;
2326 }
2327 } while (post);
2328
2329 return ret;
2330 }
2331
2332 /*
2333 * Return all the posted receive MADs
2334 */
2335 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2336 {
2337 struct ib_mad_private_header *mad_priv_hdr;
2338 struct ib_mad_private *recv;
2339 struct ib_mad_list_head *mad_list;
2340
2341 while (!list_empty(&qp_info->recv_queue.list)) {
2342
2343 mad_list = list_entry(qp_info->recv_queue.list.next,
2344 struct ib_mad_list_head, list);
2345 mad_priv_hdr = container_of(mad_list,
2346 struct ib_mad_private_header,
2347 mad_list);
2348 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2349 header);
2350
2351 /* Remove from posted receive MAD list */
2352 list_del(&mad_list->list);
2353
2354 dma_unmap_single(qp_info->port_priv->device->dma_device,
2355 pci_unmap_addr(&recv->header, mapping),
2356 sizeof(struct ib_mad_private) -
2357 sizeof(struct ib_mad_private_header),
2358 DMA_FROM_DEVICE);
2359 kmem_cache_free(ib_mad_cache, recv);
2360 }
2361
2362 qp_info->recv_queue.count = 0;
2363 }
2364
2365 /*
2366 * Start the port
2367 */
2368 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2369 {
2370 int ret, i;
2371 struct ib_qp_attr *attr;
2372 struct ib_qp *qp;
2373
2374 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2375 if (!attr) {
2376 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2377 return -ENOMEM;
2378 }
2379
2380 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2381 qp = port_priv->qp_info[i].qp;
2382 /*
2383 * PKey index for QP1 is irrelevant but
2384 * one is needed for the Reset to Init transition
2385 */
2386 attr->qp_state = IB_QPS_INIT;
2387 attr->pkey_index = 0;
2388 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2389 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2390 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2391 if (ret) {
2392 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2393 "INIT: %d\n", i, ret);
2394 goto out;
2395 }
2396
2397 attr->qp_state = IB_QPS_RTR;
2398 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2399 if (ret) {
2400 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2401 "RTR: %d\n", i, ret);
2402 goto out;
2403 }
2404
2405 attr->qp_state = IB_QPS_RTS;
2406 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2407 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2408 if (ret) {
2409 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2410 "RTS: %d\n", i, ret);
2411 goto out;
2412 }
2413 }
2414
2415 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2416 if (ret) {
2417 printk(KERN_ERR PFX "Failed to request completion "
2418 "notification: %d\n", ret);
2419 goto out;
2420 }
2421
2422 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2423 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2424 if (ret) {
2425 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2426 goto out;
2427 }
2428 }
2429 out:
2430 kfree(attr);
2431 return ret;
2432 }
2433
2434 static void qp_event_handler(struct ib_event *event, void *qp_context)
2435 {
2436 struct ib_mad_qp_info *qp_info = qp_context;
2437
2438 /* It's worse than that! He's dead, Jim! */
2439 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2440 event->event, qp_info->qp->qp_num);
2441 }
2442
2443 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2444 struct ib_mad_queue *mad_queue)
2445 {
2446 mad_queue->qp_info = qp_info;
2447 mad_queue->count = 0;
2448 spin_lock_init(&mad_queue->lock);
2449 INIT_LIST_HEAD(&mad_queue->list);
2450 }
2451
2452 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2453 struct ib_mad_qp_info *qp_info)
2454 {
2455 qp_info->port_priv = port_priv;
2456 init_mad_queue(qp_info, &qp_info->send_queue);
2457 init_mad_queue(qp_info, &qp_info->recv_queue);
2458 INIT_LIST_HEAD(&qp_info->overflow_list);
2459 spin_lock_init(&qp_info->snoop_lock);
2460 qp_info->snoop_table = NULL;
2461 qp_info->snoop_table_size = 0;
2462 atomic_set(&qp_info->snoop_count, 0);
2463 }
2464
2465 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2466 enum ib_qp_type qp_type)
2467 {
2468 struct ib_qp_init_attr qp_init_attr;
2469 int ret;
2470
2471 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2472 qp_init_attr.send_cq = qp_info->port_priv->cq;
2473 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2474 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2475 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2476 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2477 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2478 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2479 qp_init_attr.qp_type = qp_type;
2480 qp_init_attr.port_num = qp_info->port_priv->port_num;
2481 qp_init_attr.qp_context = qp_info;
2482 qp_init_attr.event_handler = qp_event_handler;
2483 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2484 if (IS_ERR(qp_info->qp)) {
2485 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2486 get_spl_qp_index(qp_type));
2487 ret = PTR_ERR(qp_info->qp);
2488 goto error;
2489 }
2490 /* Use minimum queue sizes unless the CQ is resized */
2491 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2492 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2493 return 0;
2494
2495 error:
2496 return ret;
2497 }
2498
2499 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2500 {
2501 ib_destroy_qp(qp_info->qp);
2502 kfree(qp_info->snoop_table);
2503 }
2504
2505 /*
2506 * Open the port
2507 * Create the QP, PD, MR, and CQ if needed
2508 */
2509 static int ib_mad_port_open(struct ib_device *device,
2510 int port_num)
2511 {
2512 int ret, cq_size;
2513 struct ib_mad_port_private *port_priv;
2514 unsigned long flags;
2515 char name[sizeof "ib_mad123"];
2516
2517 /* Create new device info */
2518 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2519 if (!port_priv) {
2520 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2521 return -ENOMEM;
2522 }
2523
2524 port_priv->device = device;
2525 port_priv->port_num = port_num;
2526 spin_lock_init(&port_priv->reg_lock);
2527 INIT_LIST_HEAD(&port_priv->agent_list);
2528 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2529 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2530
2531 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2532 port_priv->cq = ib_create_cq(port_priv->device,
2533 ib_mad_thread_completion_handler,
2534 NULL, port_priv, cq_size);
2535 if (IS_ERR(port_priv->cq)) {
2536 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2537 ret = PTR_ERR(port_priv->cq);
2538 goto error3;
2539 }
2540
2541 port_priv->pd = ib_alloc_pd(device);
2542 if (IS_ERR(port_priv->pd)) {
2543 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2544 ret = PTR_ERR(port_priv->pd);
2545 goto error4;
2546 }
2547
2548 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2549 if (IS_ERR(port_priv->mr)) {
2550 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2551 ret = PTR_ERR(port_priv->mr);
2552 goto error5;
2553 }
2554
2555 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2556 if (ret)
2557 goto error6;
2558 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2559 if (ret)
2560 goto error7;
2561
2562 snprintf(name, sizeof name, "ib_mad%d", port_num);
2563 port_priv->wq = create_singlethread_workqueue(name);
2564 if (!port_priv->wq) {
2565 ret = -ENOMEM;
2566 goto error8;
2567 }
2568 INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2569
2570 ret = ib_mad_port_start(port_priv);
2571 if (ret) {
2572 printk(KERN_ERR PFX "Couldn't start port\n");
2573 goto error9;
2574 }
2575
2576 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2577 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2578 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2579 return 0;
2580
2581 error9:
2582 destroy_workqueue(port_priv->wq);
2583 error8:
2584 destroy_mad_qp(&port_priv->qp_info[1]);
2585 error7:
2586 destroy_mad_qp(&port_priv->qp_info[0]);
2587 error6:
2588 ib_dereg_mr(port_priv->mr);
2589 error5:
2590 ib_dealloc_pd(port_priv->pd);
2591 error4:
2592 ib_destroy_cq(port_priv->cq);
2593 cleanup_recv_queue(&port_priv->qp_info[1]);
2594 cleanup_recv_queue(&port_priv->qp_info[0]);
2595 error3:
2596 kfree(port_priv);
2597
2598 return ret;
2599 }
2600
2601 /*
2602 * Close the port
2603 * If there are no classes using the port, free the port
2604 * resources (CQ, MR, PD, QP) and remove the port's info structure
2605 */
2606 static int ib_mad_port_close(struct ib_device *device, int port_num)
2607 {
2608 struct ib_mad_port_private *port_priv;
2609 unsigned long flags;
2610
2611 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2612 port_priv = __ib_get_mad_port(device, port_num);
2613 if (port_priv == NULL) {
2614 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2615 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2616 return -ENODEV;
2617 }
2618 list_del(&port_priv->port_list);
2619 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2620
2621 /* Stop processing completions. */
2622 flush_workqueue(port_priv->wq);
2623 destroy_workqueue(port_priv->wq);
2624 destroy_mad_qp(&port_priv->qp_info[1]);
2625 destroy_mad_qp(&port_priv->qp_info[0]);
2626 ib_dereg_mr(port_priv->mr);
2627 ib_dealloc_pd(port_priv->pd);
2628 ib_destroy_cq(port_priv->cq);
2629 cleanup_recv_queue(&port_priv->qp_info[1]);
2630 cleanup_recv_queue(&port_priv->qp_info[0]);
2631 /* XXX: Handle deallocation of MAD registration tables */
2632
2633 kfree(port_priv);
2634
2635 return 0;
2636 }
2637
2638 static void ib_mad_init_device(struct ib_device *device)
2639 {
2640 int start, end, i;
2641
2642 if (device->node_type == IB_NODE_SWITCH) {
2643 start = 0;
2644 end = 0;
2645 } else {
2646 start = 1;
2647 end = device->phys_port_cnt;
2648 }
2649
2650 for (i = start; i <= end; i++) {
2651 if (ib_mad_port_open(device, i)) {
2652 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2653 device->name, i);
2654 goto error;
2655 }
2656 if (ib_agent_port_open(device, i)) {
2657 printk(KERN_ERR PFX "Couldn't open %s port %d "
2658 "for agents\n",
2659 device->name, i);
2660 goto error_agent;
2661 }
2662 }
2663 return;
2664
2665 error_agent:
2666 if (ib_mad_port_close(device, i))
2667 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2668 device->name, i);
2669
2670 error:
2671 i--;
2672
2673 while (i >= start) {
2674 if (ib_agent_port_close(device, i))
2675 printk(KERN_ERR PFX "Couldn't close %s port %d "
2676 "for agents\n",
2677 device->name, i);
2678 if (ib_mad_port_close(device, i))
2679 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2680 device->name, i);
2681 i--;
2682 }
2683 }
2684
2685 static void ib_mad_remove_device(struct ib_device *device)
2686 {
2687 int i, num_ports, cur_port;
2688
2689 if (device->node_type == IB_NODE_SWITCH) {
2690 num_ports = 1;
2691 cur_port = 0;
2692 } else {
2693 num_ports = device->phys_port_cnt;
2694 cur_port = 1;
2695 }
2696 for (i = 0; i < num_ports; i++, cur_port++) {
2697 if (ib_agent_port_close(device, cur_port))
2698 printk(KERN_ERR PFX "Couldn't close %s port %d "
2699 "for agents\n",
2700 device->name, cur_port);
2701 if (ib_mad_port_close(device, cur_port))
2702 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2703 device->name, cur_port);
2704 }
2705 }
2706
2707 static struct ib_client mad_client = {
2708 .name = "mad",
2709 .add = ib_mad_init_device,
2710 .remove = ib_mad_remove_device
2711 };
2712
2713 static int __init ib_mad_init_module(void)
2714 {
2715 int ret;
2716
2717 spin_lock_init(&ib_mad_port_list_lock);
2718
2719 ib_mad_cache = kmem_cache_create("ib_mad",
2720 sizeof(struct ib_mad_private),
2721 0,
2722 SLAB_HWCACHE_ALIGN,
2723 NULL,
2724 NULL);
2725 if (!ib_mad_cache) {
2726 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2727 ret = -ENOMEM;
2728 goto error1;
2729 }
2730
2731 INIT_LIST_HEAD(&ib_mad_port_list);
2732
2733 if (ib_register_client(&mad_client)) {
2734 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2735 ret = -EINVAL;
2736 goto error2;
2737 }
2738
2739 return 0;
2740
2741 error2:
2742 kmem_cache_destroy(ib_mad_cache);
2743 error1:
2744 return ret;
2745 }
2746
2747 static void __exit ib_mad_cleanup_module(void)
2748 {
2749 ib_unregister_client(&mad_client);
2750
2751 if (kmem_cache_destroy(ib_mad_cache)) {
2752 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2753 }
2754 }
2755
2756 module_init(ib_mad_init_module);
2757 module_exit(ib_mad_cleanup_module);
2758
Linux kernel - Deliverables
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