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Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
[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 5596 2006-03-03 01:00:07Z sean.hefty $
35 */
36 #include <linux/dma-mapping.h>
37 #include <rdma/ib_cache.h>
38
39 #include "mad_priv.h"
40 #include "mad_rmpp.h"
41 #include "smi.h"
42 #include "agent.h"
43
44 MODULE_LICENSE("Dual BSD/GPL");
45 MODULE_DESCRIPTION("kernel IB MAD API");
46 MODULE_AUTHOR("Hal Rosenstock");
47 MODULE_AUTHOR("Sean Hefty");
48
49 static 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 RMPP */
231 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
232 if (rmpp_version)
233 goto error1;
234 }
235 /* Make sure class supplied is consistent with QP type */
236 if (qp_type == IB_QPT_SMI) {
237 if ((mad_reg_req->mgmt_class !=
238 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
239 (mad_reg_req->mgmt_class !=
240 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
241 goto error1;
242 } else {
243 if ((mad_reg_req->mgmt_class ==
244 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
245 (mad_reg_req->mgmt_class ==
246 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
247 goto error1;
248 }
249 } else {
250 /* No registration request supplied */
251 if (!send_handler)
252 goto error1;
253 }
254
255 /* Validate device and port */
256 port_priv = ib_get_mad_port(device, port_num);
257 if (!port_priv) {
258 ret = ERR_PTR(-ENODEV);
259 goto error1;
260 }
261
262 /* Allocate structures */
263 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
264 if (!mad_agent_priv) {
265 ret = ERR_PTR(-ENOMEM);
266 goto error1;
267 }
268
269 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
270 IB_ACCESS_LOCAL_WRITE);
271 if (IS_ERR(mad_agent_priv->agent.mr)) {
272 ret = ERR_PTR(-ENOMEM);
273 goto error2;
274 }
275
276 if (mad_reg_req) {
277 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
278 if (!reg_req) {
279 ret = ERR_PTR(-ENOMEM);
280 goto error3;
281 }
282 /* Make a copy of the MAD registration request */
283 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
284 }
285
286 /* Now, fill in the various structures */
287 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
288 mad_agent_priv->reg_req = reg_req;
289 mad_agent_priv->agent.rmpp_version = rmpp_version;
290 mad_agent_priv->agent.device = device;
291 mad_agent_priv->agent.recv_handler = recv_handler;
292 mad_agent_priv->agent.send_handler = send_handler;
293 mad_agent_priv->agent.context = context;
294 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
295 mad_agent_priv->agent.port_num = port_num;
296
297 spin_lock_irqsave(&port_priv->reg_lock, flags);
298 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
299
300 /*
301 * Make sure MAD registration (if supplied)
302 * is non overlapping with any existing ones
303 */
304 if (mad_reg_req) {
305 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
306 if (!is_vendor_class(mgmt_class)) {
307 class = port_priv->version[mad_reg_req->
308 mgmt_class_version].class;
309 if (class) {
310 method = class->method_table[mgmt_class];
311 if (method) {
312 if (method_in_use(&method,
313 mad_reg_req))
314 goto error4;
315 }
316 }
317 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
318 mgmt_class);
319 } else {
320 /* "New" vendor class range */
321 vendor = port_priv->version[mad_reg_req->
322 mgmt_class_version].vendor;
323 if (vendor) {
324 vclass = vendor_class_index(mgmt_class);
325 vendor_class = vendor->vendor_class[vclass];
326 if (vendor_class) {
327 if (is_vendor_method_in_use(
328 vendor_class,
329 mad_reg_req))
330 goto error4;
331 }
332 }
333 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
334 }
335 if (ret2) {
336 ret = ERR_PTR(ret2);
337 goto error4;
338 }
339 }
340
341 /* Add mad agent into port's agent list */
342 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
343 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
344
345 spin_lock_init(&mad_agent_priv->lock);
346 INIT_LIST_HEAD(&mad_agent_priv->send_list);
347 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
348 INIT_LIST_HEAD(&mad_agent_priv->done_list);
349 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
350 INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
351 INIT_LIST_HEAD(&mad_agent_priv->local_list);
352 INIT_WORK(&mad_agent_priv->local_work, local_completions,
353 mad_agent_priv);
354 atomic_set(&mad_agent_priv->refcount, 1);
355 init_completion(&mad_agent_priv->comp);
356
357 return &mad_agent_priv->agent;
358
359 error4:
360 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
361 kfree(reg_req);
362 error3:
363 ib_dereg_mr(mad_agent_priv->agent.mr);
364 error2:
365 kfree(mad_agent_priv);
366 error1:
367 return ret;
368 }
369 EXPORT_SYMBOL(ib_register_mad_agent);
370
371 static inline int is_snooping_sends(int mad_snoop_flags)
372 {
373 return (mad_snoop_flags &
374 (/*IB_MAD_SNOOP_POSTED_SENDS |
375 IB_MAD_SNOOP_RMPP_SENDS |*/
376 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
377 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
378 }
379
380 static inline int is_snooping_recvs(int mad_snoop_flags)
381 {
382 return (mad_snoop_flags &
383 (IB_MAD_SNOOP_RECVS /*|
384 IB_MAD_SNOOP_RMPP_RECVS*/));
385 }
386
387 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
388 struct ib_mad_snoop_private *mad_snoop_priv)
389 {
390 struct ib_mad_snoop_private **new_snoop_table;
391 unsigned long flags;
392 int i;
393
394 spin_lock_irqsave(&qp_info->snoop_lock, flags);
395 /* Check for empty slot in array. */
396 for (i = 0; i < qp_info->snoop_table_size; i++)
397 if (!qp_info->snoop_table[i])
398 break;
399
400 if (i == qp_info->snoop_table_size) {
401 /* Grow table. */
402 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
403 qp_info->snoop_table_size + 1,
404 GFP_ATOMIC);
405 if (!new_snoop_table) {
406 i = -ENOMEM;
407 goto out;
408 }
409 if (qp_info->snoop_table) {
410 memcpy(new_snoop_table, qp_info->snoop_table,
411 sizeof mad_snoop_priv *
412 qp_info->snoop_table_size);
413 kfree(qp_info->snoop_table);
414 }
415 qp_info->snoop_table = new_snoop_table;
416 qp_info->snoop_table_size++;
417 }
418 qp_info->snoop_table[i] = mad_snoop_priv;
419 atomic_inc(&qp_info->snoop_count);
420 out:
421 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
422 return i;
423 }
424
425 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
426 u8 port_num,
427 enum ib_qp_type qp_type,
428 int mad_snoop_flags,
429 ib_mad_snoop_handler snoop_handler,
430 ib_mad_recv_handler recv_handler,
431 void *context)
432 {
433 struct ib_mad_port_private *port_priv;
434 struct ib_mad_agent *ret;
435 struct ib_mad_snoop_private *mad_snoop_priv;
436 int qpn;
437
438 /* Validate parameters */
439 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
440 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
441 ret = ERR_PTR(-EINVAL);
442 goto error1;
443 }
444 qpn = get_spl_qp_index(qp_type);
445 if (qpn == -1) {
446 ret = ERR_PTR(-EINVAL);
447 goto error1;
448 }
449 port_priv = ib_get_mad_port(device, port_num);
450 if (!port_priv) {
451 ret = ERR_PTR(-ENODEV);
452 goto error1;
453 }
454 /* Allocate structures */
455 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
456 if (!mad_snoop_priv) {
457 ret = ERR_PTR(-ENOMEM);
458 goto error1;
459 }
460
461 /* Now, fill in the various structures */
462 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
463 mad_snoop_priv->agent.device = device;
464 mad_snoop_priv->agent.recv_handler = recv_handler;
465 mad_snoop_priv->agent.snoop_handler = snoop_handler;
466 mad_snoop_priv->agent.context = context;
467 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
468 mad_snoop_priv->agent.port_num = port_num;
469 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
470 init_completion(&mad_snoop_priv->comp);
471 mad_snoop_priv->snoop_index = register_snoop_agent(
472 &port_priv->qp_info[qpn],
473 mad_snoop_priv);
474 if (mad_snoop_priv->snoop_index < 0) {
475 ret = ERR_PTR(mad_snoop_priv->snoop_index);
476 goto error2;
477 }
478
479 atomic_set(&mad_snoop_priv->refcount, 1);
480 return &mad_snoop_priv->agent;
481
482 error2:
483 kfree(mad_snoop_priv);
484 error1:
485 return ret;
486 }
487 EXPORT_SYMBOL(ib_register_mad_snoop);
488
489 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
490 {
491 if (atomic_dec_and_test(&mad_agent_priv->refcount))
492 complete(&mad_agent_priv->comp);
493 }
494
495 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
496 {
497 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
498 complete(&mad_snoop_priv->comp);
499 }
500
501 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
502 {
503 struct ib_mad_port_private *port_priv;
504 unsigned long flags;
505
506 /* Note that we could still be handling received MADs */
507
508 /*
509 * Canceling all sends results in dropping received response
510 * MADs, preventing us from queuing additional work
511 */
512 cancel_mads(mad_agent_priv);
513 port_priv = mad_agent_priv->qp_info->port_priv;
514 cancel_delayed_work(&mad_agent_priv->timed_work);
515
516 spin_lock_irqsave(&port_priv->reg_lock, flags);
517 remove_mad_reg_req(mad_agent_priv);
518 list_del(&mad_agent_priv->agent_list);
519 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
520
521 flush_workqueue(port_priv->wq);
522 ib_cancel_rmpp_recvs(mad_agent_priv);
523
524 deref_mad_agent(mad_agent_priv);
525 wait_for_completion(&mad_agent_priv->comp);
526
527 kfree(mad_agent_priv->reg_req);
528 ib_dereg_mr(mad_agent_priv->agent.mr);
529 kfree(mad_agent_priv);
530 }
531
532 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
533 {
534 struct ib_mad_qp_info *qp_info;
535 unsigned long flags;
536
537 qp_info = mad_snoop_priv->qp_info;
538 spin_lock_irqsave(&qp_info->snoop_lock, flags);
539 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
540 atomic_dec(&qp_info->snoop_count);
541 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
542
543 deref_snoop_agent(mad_snoop_priv);
544 wait_for_completion(&mad_snoop_priv->comp);
545
546 kfree(mad_snoop_priv);
547 }
548
549 /*
550 * ib_unregister_mad_agent - Unregisters a client from using MAD services
551 */
552 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
553 {
554 struct ib_mad_agent_private *mad_agent_priv;
555 struct ib_mad_snoop_private *mad_snoop_priv;
556
557 /* If the TID is zero, the agent can only snoop. */
558 if (mad_agent->hi_tid) {
559 mad_agent_priv = container_of(mad_agent,
560 struct ib_mad_agent_private,
561 agent);
562 unregister_mad_agent(mad_agent_priv);
563 } else {
564 mad_snoop_priv = container_of(mad_agent,
565 struct ib_mad_snoop_private,
566 agent);
567 unregister_mad_snoop(mad_snoop_priv);
568 }
569 return 0;
570 }
571 EXPORT_SYMBOL(ib_unregister_mad_agent);
572
573 static inline int response_mad(struct ib_mad *mad)
574 {
575 /* Trap represses are responses although response bit is reset */
576 return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
577 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
578 }
579
580 static void dequeue_mad(struct ib_mad_list_head *mad_list)
581 {
582 struct ib_mad_queue *mad_queue;
583 unsigned long flags;
584
585 BUG_ON(!mad_list->mad_queue);
586 mad_queue = mad_list->mad_queue;
587 spin_lock_irqsave(&mad_queue->lock, flags);
588 list_del(&mad_list->list);
589 mad_queue->count--;
590 spin_unlock_irqrestore(&mad_queue->lock, flags);
591 }
592
593 static void snoop_send(struct ib_mad_qp_info *qp_info,
594 struct ib_mad_send_buf *send_buf,
595 struct ib_mad_send_wc *mad_send_wc,
596 int mad_snoop_flags)
597 {
598 struct ib_mad_snoop_private *mad_snoop_priv;
599 unsigned long flags;
600 int i;
601
602 spin_lock_irqsave(&qp_info->snoop_lock, flags);
603 for (i = 0; i < qp_info->snoop_table_size; i++) {
604 mad_snoop_priv = qp_info->snoop_table[i];
605 if (!mad_snoop_priv ||
606 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
607 continue;
608
609 atomic_inc(&mad_snoop_priv->refcount);
610 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
611 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
612 send_buf, mad_send_wc);
613 deref_snoop_agent(mad_snoop_priv);
614 spin_lock_irqsave(&qp_info->snoop_lock, flags);
615 }
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617 }
618
619 static void snoop_recv(struct ib_mad_qp_info *qp_info,
620 struct ib_mad_recv_wc *mad_recv_wc,
621 int mad_snoop_flags)
622 {
623 struct ib_mad_snoop_private *mad_snoop_priv;
624 unsigned long flags;
625 int i;
626
627 spin_lock_irqsave(&qp_info->snoop_lock, flags);
628 for (i = 0; i < qp_info->snoop_table_size; i++) {
629 mad_snoop_priv = qp_info->snoop_table[i];
630 if (!mad_snoop_priv ||
631 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
632 continue;
633
634 atomic_inc(&mad_snoop_priv->refcount);
635 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
636 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
637 mad_recv_wc);
638 deref_snoop_agent(mad_snoop_priv);
639 spin_lock_irqsave(&qp_info->snoop_lock, flags);
640 }
641 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
642 }
643
644 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
645 struct ib_wc *wc)
646 {
647 memset(wc, 0, sizeof *wc);
648 wc->wr_id = wr_id;
649 wc->status = IB_WC_SUCCESS;
650 wc->opcode = IB_WC_RECV;
651 wc->pkey_index = pkey_index;
652 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
653 wc->src_qp = IB_QP0;
654 wc->qp_num = IB_QP0;
655 wc->slid = slid;
656 wc->sl = 0;
657 wc->dlid_path_bits = 0;
658 wc->port_num = port_num;
659 }
660
661 /*
662 * Return 0 if SMP is to be sent
663 * Return 1 if SMP was consumed locally (whether or not solicited)
664 * Return < 0 if error
665 */
666 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
667 struct ib_mad_send_wr_private *mad_send_wr)
668 {
669 int ret;
670 struct ib_smp *smp = mad_send_wr->send_buf.mad;
671 unsigned long flags;
672 struct ib_mad_local_private *local;
673 struct ib_mad_private *mad_priv;
674 struct ib_mad_port_private *port_priv;
675 struct ib_mad_agent_private *recv_mad_agent = NULL;
676 struct ib_device *device = mad_agent_priv->agent.device;
677 u8 port_num = mad_agent_priv->agent.port_num;
678 struct ib_wc mad_wc;
679 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
680
681 /*
682 * Directed route handling starts if the initial LID routed part of
683 * a request or the ending LID routed part of a response is empty.
684 * If we are at the start of the LID routed part, don't update the
685 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
686 */
687 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
688 IB_LID_PERMISSIVE &&
689 !smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
690 ret = -EINVAL;
691 printk(KERN_ERR PFX "Invalid directed route\n");
692 goto out;
693 }
694 /* Check to post send on QP or process locally */
695 ret = smi_check_local_smp(smp, device);
696 if (!ret)
697 goto out;
698
699 local = kmalloc(sizeof *local, GFP_ATOMIC);
700 if (!local) {
701 ret = -ENOMEM;
702 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
703 goto out;
704 }
705 local->mad_priv = NULL;
706 local->recv_mad_agent = NULL;
707 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
708 if (!mad_priv) {
709 ret = -ENOMEM;
710 printk(KERN_ERR PFX "No memory for local response MAD\n");
711 kfree(local);
712 goto out;
713 }
714
715 build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
716 send_wr->wr.ud.pkey_index,
717 send_wr->wr.ud.port_num, &mad_wc);
718
719 /* No GRH for DR SMP */
720 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
721 (struct ib_mad *)smp,
722 (struct ib_mad *)&mad_priv->mad);
723 switch (ret)
724 {
725 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
726 if (response_mad(&mad_priv->mad.mad) &&
727 mad_agent_priv->agent.recv_handler) {
728 local->mad_priv = mad_priv;
729 local->recv_mad_agent = mad_agent_priv;
730 /*
731 * Reference MAD agent until receive
732 * side of local completion handled
733 */
734 atomic_inc(&mad_agent_priv->refcount);
735 } else
736 kmem_cache_free(ib_mad_cache, mad_priv);
737 break;
738 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
739 kmem_cache_free(ib_mad_cache, mad_priv);
740 break;
741 case IB_MAD_RESULT_SUCCESS:
742 /* Treat like an incoming receive MAD */
743 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
744 mad_agent_priv->agent.port_num);
745 if (port_priv) {
746 mad_priv->mad.mad.mad_hdr.tid =
747 ((struct ib_mad *)smp)->mad_hdr.tid;
748 recv_mad_agent = find_mad_agent(port_priv,
749 &mad_priv->mad.mad);
750 }
751 if (!port_priv || !recv_mad_agent) {
752 kmem_cache_free(ib_mad_cache, mad_priv);
753 kfree(local);
754 ret = 0;
755 goto out;
756 }
757 local->mad_priv = mad_priv;
758 local->recv_mad_agent = recv_mad_agent;
759 break;
760 default:
761 kmem_cache_free(ib_mad_cache, mad_priv);
762 kfree(local);
763 ret = -EINVAL;
764 goto out;
765 }
766
767 local->mad_send_wr = mad_send_wr;
768 /* Reference MAD agent until send side of local completion handled */
769 atomic_inc(&mad_agent_priv->refcount);
770 /* Queue local completion to local list */
771 spin_lock_irqsave(&mad_agent_priv->lock, flags);
772 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
773 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
774 queue_work(mad_agent_priv->qp_info->port_priv->wq,
775 &mad_agent_priv->local_work);
776 ret = 1;
777 out:
778 return ret;
779 }
780
781 static int get_pad_size(int hdr_len, int data_len)
782 {
783 int seg_size, pad;
784
785 seg_size = sizeof(struct ib_mad) - hdr_len;
786 if (data_len && seg_size) {
787 pad = seg_size - data_len % seg_size;
788 return pad == seg_size ? 0 : pad;
789 } else
790 return seg_size;
791 }
792
793 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
794 {
795 struct ib_rmpp_segment *s, *t;
796
797 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
798 list_del(&s->list);
799 kfree(s);
800 }
801 }
802
803 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
804 gfp_t gfp_mask)
805 {
806 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
807 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
808 struct ib_rmpp_segment *seg = NULL;
809 int left, seg_size, pad;
810
811 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
812 seg_size = send_buf->seg_size;
813 pad = send_wr->pad;
814
815 /* Allocate data segments. */
816 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
817 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
818 if (!seg) {
819 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
820 "alloc failed for len %zd, gfp %#x\n",
821 sizeof (*seg) + seg_size, gfp_mask);
822 free_send_rmpp_list(send_wr);
823 return -ENOMEM;
824 }
825 seg->num = ++send_buf->seg_count;
826 list_add_tail(&seg->list, &send_wr->rmpp_list);
827 }
828
829 /* Zero any padding */
830 if (pad)
831 memset(seg->data + seg_size - pad, 0, pad);
832
833 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
834 agent.rmpp_version;
835 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
836 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
837
838 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
839 struct ib_rmpp_segment, list);
840 send_wr->last_ack_seg = send_wr->cur_seg;
841 return 0;
842 }
843
844 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
845 u32 remote_qpn, u16 pkey_index,
846 int rmpp_active,
847 int hdr_len, int data_len,
848 gfp_t gfp_mask)
849 {
850 struct ib_mad_agent_private *mad_agent_priv;
851 struct ib_mad_send_wr_private *mad_send_wr;
852 int pad, message_size, ret, size;
853 void *buf;
854
855 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
856 agent);
857 pad = get_pad_size(hdr_len, data_len);
858 message_size = hdr_len + data_len + pad;
859
860 if ((!mad_agent->rmpp_version &&
861 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
862 (!rmpp_active && message_size > sizeof(struct ib_mad)))
863 return ERR_PTR(-EINVAL);
864
865 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
866 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
867 if (!buf)
868 return ERR_PTR(-ENOMEM);
869
870 mad_send_wr = buf + size;
871 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
872 mad_send_wr->send_buf.mad = buf;
873 mad_send_wr->send_buf.hdr_len = hdr_len;
874 mad_send_wr->send_buf.data_len = data_len;
875 mad_send_wr->pad = pad;
876
877 mad_send_wr->mad_agent_priv = mad_agent_priv;
878 mad_send_wr->sg_list[0].length = hdr_len;
879 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
880 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
881 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
882
883 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
884 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
885 mad_send_wr->send_wr.num_sge = 2;
886 mad_send_wr->send_wr.opcode = IB_WR_SEND;
887 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
888 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
889 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
890 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
891
892 if (rmpp_active) {
893 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
894 if (ret) {
895 kfree(buf);
896 return ERR_PTR(ret);
897 }
898 }
899
900 mad_send_wr->send_buf.mad_agent = mad_agent;
901 atomic_inc(&mad_agent_priv->refcount);
902 return &mad_send_wr->send_buf;
903 }
904 EXPORT_SYMBOL(ib_create_send_mad);
905
906 int ib_get_mad_data_offset(u8 mgmt_class)
907 {
908 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
909 return IB_MGMT_SA_HDR;
910 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
911 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
912 (mgmt_class == IB_MGMT_CLASS_BIS))
913 return IB_MGMT_DEVICE_HDR;
914 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
915 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
916 return IB_MGMT_VENDOR_HDR;
917 else
918 return IB_MGMT_MAD_HDR;
919 }
920 EXPORT_SYMBOL(ib_get_mad_data_offset);
921
922 int ib_is_mad_class_rmpp(u8 mgmt_class)
923 {
924 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
925 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
926 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
927 (mgmt_class == IB_MGMT_CLASS_BIS) ||
928 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
929 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
930 return 1;
931 return 0;
932 }
933 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
934
935 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
936 {
937 struct ib_mad_send_wr_private *mad_send_wr;
938 struct list_head *list;
939
940 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
941 send_buf);
942 list = &mad_send_wr->cur_seg->list;
943
944 if (mad_send_wr->cur_seg->num < seg_num) {
945 list_for_each_entry(mad_send_wr->cur_seg, list, list)
946 if (mad_send_wr->cur_seg->num == seg_num)
947 break;
948 } else if (mad_send_wr->cur_seg->num > seg_num) {
949 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
950 if (mad_send_wr->cur_seg->num == seg_num)
951 break;
952 }
953 return mad_send_wr->cur_seg->data;
954 }
955 EXPORT_SYMBOL(ib_get_rmpp_segment);
956
957 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
958 {
959 if (mad_send_wr->send_buf.seg_count)
960 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
961 mad_send_wr->seg_num);
962 else
963 return mad_send_wr->send_buf.mad +
964 mad_send_wr->send_buf.hdr_len;
965 }
966
967 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
968 {
969 struct ib_mad_agent_private *mad_agent_priv;
970 struct ib_mad_send_wr_private *mad_send_wr;
971
972 mad_agent_priv = container_of(send_buf->mad_agent,
973 struct ib_mad_agent_private, agent);
974 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
975 send_buf);
976
977 free_send_rmpp_list(mad_send_wr);
978 kfree(send_buf->mad);
979 deref_mad_agent(mad_agent_priv);
980 }
981 EXPORT_SYMBOL(ib_free_send_mad);
982
983 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
984 {
985 struct ib_mad_qp_info *qp_info;
986 struct list_head *list;
987 struct ib_send_wr *bad_send_wr;
988 struct ib_mad_agent *mad_agent;
989 struct ib_sge *sge;
990 unsigned long flags;
991 int ret;
992
993 /* Set WR ID to find mad_send_wr upon completion */
994 qp_info = mad_send_wr->mad_agent_priv->qp_info;
995 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
996 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
997
998 mad_agent = mad_send_wr->send_buf.mad_agent;
999 sge = mad_send_wr->sg_list;
1000 sge[0].addr = dma_map_single(mad_agent->device->dma_device,
1001 mad_send_wr->send_buf.mad,
1002 sge[0].length,
1003 DMA_TO_DEVICE);
1004 pci_unmap_addr_set(mad_send_wr, header_mapping, sge[0].addr);
1005
1006 sge[1].addr = dma_map_single(mad_agent->device->dma_device,
1007 ib_get_payload(mad_send_wr),
1008 sge[1].length,
1009 DMA_TO_DEVICE);
1010 pci_unmap_addr_set(mad_send_wr, payload_mapping, sge[1].addr);
1011
1012 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1013 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1014 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1015 &bad_send_wr);
1016 list = &qp_info->send_queue.list;
1017 } else {
1018 ret = 0;
1019 list = &qp_info->overflow_list;
1020 }
1021
1022 if (!ret) {
1023 qp_info->send_queue.count++;
1024 list_add_tail(&mad_send_wr->mad_list.list, list);
1025 }
1026 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1027 if (ret) {
1028 dma_unmap_single(mad_agent->device->dma_device,
1029 pci_unmap_addr(mad_send_wr, header_mapping),
1030 sge[0].length, DMA_TO_DEVICE);
1031 dma_unmap_single(mad_agent->device->dma_device,
1032 pci_unmap_addr(mad_send_wr, payload_mapping),
1033 sge[1].length, DMA_TO_DEVICE);
1034 }
1035 return ret;
1036 }
1037
1038 /*
1039 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1040 * with the registered client
1041 */
1042 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1043 struct ib_mad_send_buf **bad_send_buf)
1044 {
1045 struct ib_mad_agent_private *mad_agent_priv;
1046 struct ib_mad_send_buf *next_send_buf;
1047 struct ib_mad_send_wr_private *mad_send_wr;
1048 unsigned long flags;
1049 int ret = -EINVAL;
1050
1051 /* Walk list of send WRs and post each on send list */
1052 for (; send_buf; send_buf = next_send_buf) {
1053
1054 mad_send_wr = container_of(send_buf,
1055 struct ib_mad_send_wr_private,
1056 send_buf);
1057 mad_agent_priv = mad_send_wr->mad_agent_priv;
1058
1059 if (!send_buf->mad_agent->send_handler ||
1060 (send_buf->timeout_ms &&
1061 !send_buf->mad_agent->recv_handler)) {
1062 ret = -EINVAL;
1063 goto error;
1064 }
1065
1066 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1067 if (mad_agent_priv->agent.rmpp_version) {
1068 ret = -EINVAL;
1069 goto error;
1070 }
1071 }
1072
1073 /*
1074 * Save pointer to next work request to post in case the
1075 * current one completes, and the user modifies the work
1076 * request associated with the completion
1077 */
1078 next_send_buf = send_buf->next;
1079 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1080
1081 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1082 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1083 ret = handle_outgoing_dr_smp(mad_agent_priv,
1084 mad_send_wr);
1085 if (ret < 0) /* error */
1086 goto error;
1087 else if (ret == 1) /* locally consumed */
1088 continue;
1089 }
1090
1091 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1092 /* Timeout will be updated after send completes */
1093 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1094 mad_send_wr->retries = send_buf->retries;
1095 /* Reference for work request to QP + response */
1096 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1097 mad_send_wr->status = IB_WC_SUCCESS;
1098
1099 /* Reference MAD agent until send completes */
1100 atomic_inc(&mad_agent_priv->refcount);
1101 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1102 list_add_tail(&mad_send_wr->agent_list,
1103 &mad_agent_priv->send_list);
1104 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1105
1106 if (mad_agent_priv->agent.rmpp_version) {
1107 ret = ib_send_rmpp_mad(mad_send_wr);
1108 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1109 ret = ib_send_mad(mad_send_wr);
1110 } else
1111 ret = ib_send_mad(mad_send_wr);
1112 if (ret < 0) {
1113 /* Fail send request */
1114 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1115 list_del(&mad_send_wr->agent_list);
1116 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1117 atomic_dec(&mad_agent_priv->refcount);
1118 goto error;
1119 }
1120 }
1121 return 0;
1122 error:
1123 if (bad_send_buf)
1124 *bad_send_buf = send_buf;
1125 return ret;
1126 }
1127 EXPORT_SYMBOL(ib_post_send_mad);
1128
1129 /*
1130 * ib_free_recv_mad - Returns data buffers used to receive
1131 * a MAD to the access layer
1132 */
1133 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1134 {
1135 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1136 struct ib_mad_private_header *mad_priv_hdr;
1137 struct ib_mad_private *priv;
1138 struct list_head free_list;
1139
1140 INIT_LIST_HEAD(&free_list);
1141 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1142
1143 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1144 &free_list, list) {
1145 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1146 recv_buf);
1147 mad_priv_hdr = container_of(mad_recv_wc,
1148 struct ib_mad_private_header,
1149 recv_wc);
1150 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1151 header);
1152 kmem_cache_free(ib_mad_cache, priv);
1153 }
1154 }
1155 EXPORT_SYMBOL(ib_free_recv_mad);
1156
1157 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1158 u8 rmpp_version,
1159 ib_mad_send_handler send_handler,
1160 ib_mad_recv_handler recv_handler,
1161 void *context)
1162 {
1163 return ERR_PTR(-EINVAL); /* XXX: for now */
1164 }
1165 EXPORT_SYMBOL(ib_redirect_mad_qp);
1166
1167 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1168 struct ib_wc *wc)
1169 {
1170 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1171 return 0;
1172 }
1173 EXPORT_SYMBOL(ib_process_mad_wc);
1174
1175 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1176 struct ib_mad_reg_req *mad_reg_req)
1177 {
1178 int i;
1179
1180 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1181 i < IB_MGMT_MAX_METHODS;
1182 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1183 1+i)) {
1184 if ((*method)->agent[i]) {
1185 printk(KERN_ERR PFX "Method %d already in use\n", i);
1186 return -EINVAL;
1187 }
1188 }
1189 return 0;
1190 }
1191
1192 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1193 {
1194 /* Allocate management method table */
1195 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1196 if (!*method) {
1197 printk(KERN_ERR PFX "No memory for "
1198 "ib_mad_mgmt_method_table\n");
1199 return -ENOMEM;
1200 }
1201
1202 return 0;
1203 }
1204
1205 /*
1206 * Check to see if there are any methods still in use
1207 */
1208 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1209 {
1210 int i;
1211
1212 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1213 if (method->agent[i])
1214 return 1;
1215 return 0;
1216 }
1217
1218 /*
1219 * Check to see if there are any method tables for this class still in use
1220 */
1221 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1222 {
1223 int i;
1224
1225 for (i = 0; i < MAX_MGMT_CLASS; i++)
1226 if (class->method_table[i])
1227 return 1;
1228 return 0;
1229 }
1230
1231 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1232 {
1233 int i;
1234
1235 for (i = 0; i < MAX_MGMT_OUI; i++)
1236 if (vendor_class->method_table[i])
1237 return 1;
1238 return 0;
1239 }
1240
1241 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1242 char *oui)
1243 {
1244 int i;
1245
1246 for (i = 0; i < MAX_MGMT_OUI; i++)
1247 /* Is there matching OUI for this vendor class ? */
1248 if (!memcmp(vendor_class->oui[i], oui, 3))
1249 return i;
1250
1251 return -1;
1252 }
1253
1254 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1255 {
1256 int i;
1257
1258 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1259 if (vendor->vendor_class[i])
1260 return 1;
1261
1262 return 0;
1263 }
1264
1265 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1266 struct ib_mad_agent_private *agent)
1267 {
1268 int i;
1269
1270 /* Remove any methods for this mad agent */
1271 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1272 if (method->agent[i] == agent) {
1273 method->agent[i] = NULL;
1274 }
1275 }
1276 }
1277
1278 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1279 struct ib_mad_agent_private *agent_priv,
1280 u8 mgmt_class)
1281 {
1282 struct ib_mad_port_private *port_priv;
1283 struct ib_mad_mgmt_class_table **class;
1284 struct ib_mad_mgmt_method_table **method;
1285 int i, ret;
1286
1287 port_priv = agent_priv->qp_info->port_priv;
1288 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1289 if (!*class) {
1290 /* Allocate management class table for "new" class version */
1291 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1292 if (!*class) {
1293 printk(KERN_ERR PFX "No memory for "
1294 "ib_mad_mgmt_class_table\n");
1295 ret = -ENOMEM;
1296 goto error1;
1297 }
1298
1299 /* Allocate method table for this management class */
1300 method = &(*class)->method_table[mgmt_class];
1301 if ((ret = allocate_method_table(method)))
1302 goto error2;
1303 } else {
1304 method = &(*class)->method_table[mgmt_class];
1305 if (!*method) {
1306 /* Allocate method table for this management class */
1307 if ((ret = allocate_method_table(method)))
1308 goto error1;
1309 }
1310 }
1311
1312 /* Now, make sure methods are not already in use */
1313 if (method_in_use(method, mad_reg_req))
1314 goto error3;
1315
1316 /* Finally, add in methods being registered */
1317 for (i = find_first_bit(mad_reg_req->method_mask,
1318 IB_MGMT_MAX_METHODS);
1319 i < IB_MGMT_MAX_METHODS;
1320 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1321 1+i)) {
1322 (*method)->agent[i] = agent_priv;
1323 }
1324 return 0;
1325
1326 error3:
1327 /* Remove any methods for this mad agent */
1328 remove_methods_mad_agent(*method, agent_priv);
1329 /* Now, check to see if there are any methods in use */
1330 if (!check_method_table(*method)) {
1331 /* If not, release management method table */
1332 kfree(*method);
1333 *method = NULL;
1334 }
1335 ret = -EINVAL;
1336 goto error1;
1337 error2:
1338 kfree(*class);
1339 *class = NULL;
1340 error1:
1341 return ret;
1342 }
1343
1344 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1345 struct ib_mad_agent_private *agent_priv)
1346 {
1347 struct ib_mad_port_private *port_priv;
1348 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1349 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1350 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1351 struct ib_mad_mgmt_method_table **method;
1352 int i, ret = -ENOMEM;
1353 u8 vclass;
1354
1355 /* "New" vendor (with OUI) class */
1356 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1357 port_priv = agent_priv->qp_info->port_priv;
1358 vendor_table = &port_priv->version[
1359 mad_reg_req->mgmt_class_version].vendor;
1360 if (!*vendor_table) {
1361 /* Allocate mgmt vendor class table for "new" class version */
1362 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1363 if (!vendor) {
1364 printk(KERN_ERR PFX "No memory for "
1365 "ib_mad_mgmt_vendor_class_table\n");
1366 goto error1;
1367 }
1368
1369 *vendor_table = vendor;
1370 }
1371 if (!(*vendor_table)->vendor_class[vclass]) {
1372 /* Allocate table for this management vendor class */
1373 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1374 if (!vendor_class) {
1375 printk(KERN_ERR PFX "No memory for "
1376 "ib_mad_mgmt_vendor_class\n");
1377 goto error2;
1378 }
1379
1380 (*vendor_table)->vendor_class[vclass] = vendor_class;
1381 }
1382 for (i = 0; i < MAX_MGMT_OUI; i++) {
1383 /* Is there matching OUI for this vendor class ? */
1384 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1385 mad_reg_req->oui, 3)) {
1386 method = &(*vendor_table)->vendor_class[
1387 vclass]->method_table[i];
1388 BUG_ON(!*method);
1389 goto check_in_use;
1390 }
1391 }
1392 for (i = 0; i < MAX_MGMT_OUI; i++) {
1393 /* OUI slot available ? */
1394 if (!is_vendor_oui((*vendor_table)->vendor_class[
1395 vclass]->oui[i])) {
1396 method = &(*vendor_table)->vendor_class[
1397 vclass]->method_table[i];
1398 BUG_ON(*method);
1399 /* Allocate method table for this OUI */
1400 if ((ret = allocate_method_table(method)))
1401 goto error3;
1402 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1403 mad_reg_req->oui, 3);
1404 goto check_in_use;
1405 }
1406 }
1407 printk(KERN_ERR PFX "All OUI slots in use\n");
1408 goto error3;
1409
1410 check_in_use:
1411 /* Now, make sure methods are not already in use */
1412 if (method_in_use(method, mad_reg_req))
1413 goto error4;
1414
1415 /* Finally, add in methods being registered */
1416 for (i = find_first_bit(mad_reg_req->method_mask,
1417 IB_MGMT_MAX_METHODS);
1418 i < IB_MGMT_MAX_METHODS;
1419 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1420 1+i)) {
1421 (*method)->agent[i] = agent_priv;
1422 }
1423 return 0;
1424
1425 error4:
1426 /* Remove any methods for this mad agent */
1427 remove_methods_mad_agent(*method, agent_priv);
1428 /* Now, check to see if there are any methods in use */
1429 if (!check_method_table(*method)) {
1430 /* If not, release management method table */
1431 kfree(*method);
1432 *method = NULL;
1433 }
1434 ret = -EINVAL;
1435 error3:
1436 if (vendor_class) {
1437 (*vendor_table)->vendor_class[vclass] = NULL;
1438 kfree(vendor_class);
1439 }
1440 error2:
1441 if (vendor) {
1442 *vendor_table = NULL;
1443 kfree(vendor);
1444 }
1445 error1:
1446 return ret;
1447 }
1448
1449 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1450 {
1451 struct ib_mad_port_private *port_priv;
1452 struct ib_mad_mgmt_class_table *class;
1453 struct ib_mad_mgmt_method_table *method;
1454 struct ib_mad_mgmt_vendor_class_table *vendor;
1455 struct ib_mad_mgmt_vendor_class *vendor_class;
1456 int index;
1457 u8 mgmt_class;
1458
1459 /*
1460 * Was MAD registration request supplied
1461 * with original registration ?
1462 */
1463 if (!agent_priv->reg_req) {
1464 goto out;
1465 }
1466
1467 port_priv = agent_priv->qp_info->port_priv;
1468 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1469 class = port_priv->version[
1470 agent_priv->reg_req->mgmt_class_version].class;
1471 if (!class)
1472 goto vendor_check;
1473
1474 method = class->method_table[mgmt_class];
1475 if (method) {
1476 /* Remove any methods for this mad agent */
1477 remove_methods_mad_agent(method, agent_priv);
1478 /* Now, check to see if there are any methods still in use */
1479 if (!check_method_table(method)) {
1480 /* If not, release management method table */
1481 kfree(method);
1482 class->method_table[mgmt_class] = NULL;
1483 /* Any management classes left ? */
1484 if (!check_class_table(class)) {
1485 /* If not, release management class table */
1486 kfree(class);
1487 port_priv->version[
1488 agent_priv->reg_req->
1489 mgmt_class_version].class = NULL;
1490 }
1491 }
1492 }
1493
1494 vendor_check:
1495 if (!is_vendor_class(mgmt_class))
1496 goto out;
1497
1498 /* normalize mgmt_class to vendor range 2 */
1499 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1500 vendor = port_priv->version[
1501 agent_priv->reg_req->mgmt_class_version].vendor;
1502
1503 if (!vendor)
1504 goto out;
1505
1506 vendor_class = vendor->vendor_class[mgmt_class];
1507 if (vendor_class) {
1508 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1509 if (index < 0)
1510 goto out;
1511 method = vendor_class->method_table[index];
1512 if (method) {
1513 /* Remove any methods for this mad agent */
1514 remove_methods_mad_agent(method, agent_priv);
1515 /*
1516 * Now, check to see if there are
1517 * any methods still in use
1518 */
1519 if (!check_method_table(method)) {
1520 /* If not, release management method table */
1521 kfree(method);
1522 vendor_class->method_table[index] = NULL;
1523 memset(vendor_class->oui[index], 0, 3);
1524 /* Any OUIs left ? */
1525 if (!check_vendor_class(vendor_class)) {
1526 /* If not, release vendor class table */
1527 kfree(vendor_class);
1528 vendor->vendor_class[mgmt_class] = NULL;
1529 /* Any other vendor classes left ? */
1530 if (!check_vendor_table(vendor)) {
1531 kfree(vendor);
1532 port_priv->version[
1533 agent_priv->reg_req->
1534 mgmt_class_version].
1535 vendor = NULL;
1536 }
1537 }
1538 }
1539 }
1540 }
1541
1542 out:
1543 return;
1544 }
1545
1546 static struct ib_mad_agent_private *
1547 find_mad_agent(struct ib_mad_port_private *port_priv,
1548 struct ib_mad *mad)
1549 {
1550 struct ib_mad_agent_private *mad_agent = NULL;
1551 unsigned long flags;
1552
1553 spin_lock_irqsave(&port_priv->reg_lock, flags);
1554 if (response_mad(mad)) {
1555 u32 hi_tid;
1556 struct ib_mad_agent_private *entry;
1557
1558 /*
1559 * Routing is based on high 32 bits of transaction ID
1560 * of MAD.
1561 */
1562 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1563 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1564 if (entry->agent.hi_tid == hi_tid) {
1565 mad_agent = entry;
1566 break;
1567 }
1568 }
1569 } else {
1570 struct ib_mad_mgmt_class_table *class;
1571 struct ib_mad_mgmt_method_table *method;
1572 struct ib_mad_mgmt_vendor_class_table *vendor;
1573 struct ib_mad_mgmt_vendor_class *vendor_class;
1574 struct ib_vendor_mad *vendor_mad;
1575 int index;
1576
1577 /*
1578 * Routing is based on version, class, and method
1579 * For "newer" vendor MADs, also based on OUI
1580 */
1581 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1582 goto out;
1583 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1584 class = port_priv->version[
1585 mad->mad_hdr.class_version].class;
1586 if (!class)
1587 goto out;
1588 method = class->method_table[convert_mgmt_class(
1589 mad->mad_hdr.mgmt_class)];
1590 if (method)
1591 mad_agent = method->agent[mad->mad_hdr.method &
1592 ~IB_MGMT_METHOD_RESP];
1593 } else {
1594 vendor = port_priv->version[
1595 mad->mad_hdr.class_version].vendor;
1596 if (!vendor)
1597 goto out;
1598 vendor_class = vendor->vendor_class[vendor_class_index(
1599 mad->mad_hdr.mgmt_class)];
1600 if (!vendor_class)
1601 goto out;
1602 /* Find matching OUI */
1603 vendor_mad = (struct ib_vendor_mad *)mad;
1604 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1605 if (index == -1)
1606 goto out;
1607 method = vendor_class->method_table[index];
1608 if (method) {
1609 mad_agent = method->agent[mad->mad_hdr.method &
1610 ~IB_MGMT_METHOD_RESP];
1611 }
1612 }
1613 }
1614
1615 if (mad_agent) {
1616 if (mad_agent->agent.recv_handler)
1617 atomic_inc(&mad_agent->refcount);
1618 else {
1619 printk(KERN_NOTICE PFX "No receive handler for client "
1620 "%p on port %d\n",
1621 &mad_agent->agent, port_priv->port_num);
1622 mad_agent = NULL;
1623 }
1624 }
1625 out:
1626 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1627
1628 return mad_agent;
1629 }
1630
1631 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1632 {
1633 int valid = 0;
1634
1635 /* Make sure MAD base version is understood */
1636 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1637 printk(KERN_ERR PFX "MAD received with unsupported base "
1638 "version %d\n", mad->mad_hdr.base_version);
1639 goto out;
1640 }
1641
1642 /* Filter SMI packets sent to other than QP0 */
1643 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1644 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1645 if (qp_num == 0)
1646 valid = 1;
1647 } else {
1648 /* Filter GSI packets sent to QP0 */
1649 if (qp_num != 0)
1650 valid = 1;
1651 }
1652
1653 out:
1654 return valid;
1655 }
1656
1657 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1658 struct ib_mad_hdr *mad_hdr)
1659 {
1660 struct ib_rmpp_mad *rmpp_mad;
1661
1662 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1663 return !mad_agent_priv->agent.rmpp_version ||
1664 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1665 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1666 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1667 }
1668
1669 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1670 struct ib_mad_recv_wc *rwc)
1671 {
1672 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1673 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1674 }
1675
1676 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1677 struct ib_mad_send_wr_private *wr,
1678 struct ib_mad_recv_wc *rwc )
1679 {
1680 struct ib_ah_attr attr;
1681 u8 send_resp, rcv_resp;
1682 union ib_gid sgid;
1683 struct ib_device *device = mad_agent_priv->agent.device;
1684 u8 port_num = mad_agent_priv->agent.port_num;
1685 u8 lmc;
1686
1687 send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1688 mad_hdr.method & IB_MGMT_METHOD_RESP;
1689 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1690
1691 if (send_resp == rcv_resp)
1692 /* both requests, or both responses. GIDs different */
1693 return 0;
1694
1695 if (ib_query_ah(wr->send_buf.ah, &attr))
1696 /* Assume not equal, to avoid false positives. */
1697 return 0;
1698
1699 if (!!(attr.ah_flags & IB_AH_GRH) !=
1700 !!(rwc->wc->wc_flags & IB_WC_GRH))
1701 /* one has GID, other does not. Assume different */
1702 return 0;
1703
1704 if (!send_resp && rcv_resp) {
1705 /* is request/response. */
1706 if (!(attr.ah_flags & IB_AH_GRH)) {
1707 if (ib_get_cached_lmc(device, port_num, &lmc))
1708 return 0;
1709 return (!lmc || !((attr.src_path_bits ^
1710 rwc->wc->dlid_path_bits) &
1711 ((1 << lmc) - 1)));
1712 } else {
1713 if (ib_get_cached_gid(device, port_num,
1714 attr.grh.sgid_index, &sgid))
1715 return 0;
1716 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1717 16);
1718 }
1719 }
1720
1721 if (!(attr.ah_flags & IB_AH_GRH))
1722 return attr.dlid == rwc->wc->slid;
1723 else
1724 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1725 16);
1726 }
1727
1728 static inline int is_direct(u8 class)
1729 {
1730 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1731 }
1732
1733 struct ib_mad_send_wr_private*
1734 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1735 struct ib_mad_recv_wc *wc)
1736 {
1737 struct ib_mad_send_wr_private *wr;
1738 struct ib_mad *mad;
1739
1740 mad = (struct ib_mad *)wc->recv_buf.mad;
1741
1742 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1743 if ((wr->tid == mad->mad_hdr.tid) &&
1744 rcv_has_same_class(wr, wc) &&
1745 /*
1746 * Don't check GID for direct routed MADs.
1747 * These might have permissive LIDs.
1748 */
1749 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1750 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1751 return wr;
1752 }
1753
1754 /*
1755 * It's possible to receive the response before we've
1756 * been notified that the send has completed
1757 */
1758 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1759 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1760 wr->tid == mad->mad_hdr.tid &&
1761 wr->timeout &&
1762 rcv_has_same_class(wr, wc) &&
1763 /*
1764 * Don't check GID for direct routed MADs.
1765 * These might have permissive LIDs.
1766 */
1767 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1768 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1769 /* Verify request has not been canceled */
1770 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1771 }
1772 return NULL;
1773 }
1774
1775 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1776 {
1777 mad_send_wr->timeout = 0;
1778 if (mad_send_wr->refcount == 1)
1779 list_move_tail(&mad_send_wr->agent_list,
1780 &mad_send_wr->mad_agent_priv->done_list);
1781 }
1782
1783 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1784 struct ib_mad_recv_wc *mad_recv_wc)
1785 {
1786 struct ib_mad_send_wr_private *mad_send_wr;
1787 struct ib_mad_send_wc mad_send_wc;
1788 unsigned long flags;
1789
1790 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1791 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1792 if (mad_agent_priv->agent.rmpp_version) {
1793 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1794 mad_recv_wc);
1795 if (!mad_recv_wc) {
1796 deref_mad_agent(mad_agent_priv);
1797 return;
1798 }
1799 }
1800
1801 /* Complete corresponding request */
1802 if (response_mad(mad_recv_wc->recv_buf.mad)) {
1803 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1804 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1805 if (!mad_send_wr) {
1806 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1807 ib_free_recv_mad(mad_recv_wc);
1808 deref_mad_agent(mad_agent_priv);
1809 return;
1810 }
1811 ib_mark_mad_done(mad_send_wr);
1812 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1813
1814 /* Defined behavior is to complete response before request */
1815 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1816 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1817 mad_recv_wc);
1818 atomic_dec(&mad_agent_priv->refcount);
1819
1820 mad_send_wc.status = IB_WC_SUCCESS;
1821 mad_send_wc.vendor_err = 0;
1822 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1823 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1824 } else {
1825 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1826 mad_recv_wc);
1827 deref_mad_agent(mad_agent_priv);
1828 }
1829 }
1830
1831 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1832 struct ib_wc *wc)
1833 {
1834 struct ib_mad_qp_info *qp_info;
1835 struct ib_mad_private_header *mad_priv_hdr;
1836 struct ib_mad_private *recv, *response;
1837 struct ib_mad_list_head *mad_list;
1838 struct ib_mad_agent_private *mad_agent;
1839
1840 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1841 if (!response)
1842 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1843 "for response buffer\n");
1844
1845 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1846 qp_info = mad_list->mad_queue->qp_info;
1847 dequeue_mad(mad_list);
1848
1849 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1850 mad_list);
1851 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1852 dma_unmap_single(port_priv->device->dma_device,
1853 pci_unmap_addr(&recv->header, mapping),
1854 sizeof(struct ib_mad_private) -
1855 sizeof(struct ib_mad_private_header),
1856 DMA_FROM_DEVICE);
1857
1858 /* Setup MAD receive work completion from "normal" work completion */
1859 recv->header.wc = *wc;
1860 recv->header.recv_wc.wc = &recv->header.wc;
1861 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1862 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1863 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1864
1865 if (atomic_read(&qp_info->snoop_count))
1866 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1867
1868 /* Validate MAD */
1869 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1870 goto out;
1871
1872 if (recv->mad.mad.mad_hdr.mgmt_class ==
1873 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1874 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1875 port_priv->device->node_type,
1876 port_priv->port_num,
1877 port_priv->device->phys_port_cnt))
1878 goto out;
1879 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1880 goto local;
1881 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1882 port_priv->device->node_type,
1883 port_priv->port_num))
1884 goto out;
1885 if (!smi_check_local_smp(&recv->mad.smp, port_priv->device))
1886 goto out;
1887 }
1888
1889 local:
1890 /* Give driver "right of first refusal" on incoming MAD */
1891 if (port_priv->device->process_mad) {
1892 int ret;
1893
1894 if (!response) {
1895 printk(KERN_ERR PFX "No memory for response MAD\n");
1896 /*
1897 * Is it better to assume that
1898 * it wouldn't be processed ?
1899 */
1900 goto out;
1901 }
1902
1903 ret = port_priv->device->process_mad(port_priv->device, 0,
1904 port_priv->port_num,
1905 wc, &recv->grh,
1906 &recv->mad.mad,
1907 &response->mad.mad);
1908 if (ret & IB_MAD_RESULT_SUCCESS) {
1909 if (ret & IB_MAD_RESULT_CONSUMED)
1910 goto out;
1911 if (ret & IB_MAD_RESULT_REPLY) {
1912 agent_send_response(&response->mad.mad,
1913 &recv->grh, wc,
1914 port_priv->device,
1915 port_priv->port_num,
1916 qp_info->qp->qp_num);
1917 goto out;
1918 }
1919 }
1920 }
1921
1922 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1923 if (mad_agent) {
1924 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1925 /*
1926 * recv is freed up in error cases in ib_mad_complete_recv
1927 * or via recv_handler in ib_mad_complete_recv()
1928 */
1929 recv = NULL;
1930 }
1931
1932 out:
1933 /* Post another receive request for this QP */
1934 if (response) {
1935 ib_mad_post_receive_mads(qp_info, response);
1936 if (recv)
1937 kmem_cache_free(ib_mad_cache, recv);
1938 } else
1939 ib_mad_post_receive_mads(qp_info, recv);
1940 }
1941
1942 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1943 {
1944 struct ib_mad_send_wr_private *mad_send_wr;
1945 unsigned long delay;
1946
1947 if (list_empty(&mad_agent_priv->wait_list)) {
1948 cancel_delayed_work(&mad_agent_priv->timed_work);
1949 } else {
1950 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1951 struct ib_mad_send_wr_private,
1952 agent_list);
1953
1954 if (time_after(mad_agent_priv->timeout,
1955 mad_send_wr->timeout)) {
1956 mad_agent_priv->timeout = mad_send_wr->timeout;
1957 cancel_delayed_work(&mad_agent_priv->timed_work);
1958 delay = mad_send_wr->timeout - jiffies;
1959 if ((long)delay <= 0)
1960 delay = 1;
1961 queue_delayed_work(mad_agent_priv->qp_info->
1962 port_priv->wq,
1963 &mad_agent_priv->timed_work, delay);
1964 }
1965 }
1966 }
1967
1968 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1969 {
1970 struct ib_mad_agent_private *mad_agent_priv;
1971 struct ib_mad_send_wr_private *temp_mad_send_wr;
1972 struct list_head *list_item;
1973 unsigned long delay;
1974
1975 mad_agent_priv = mad_send_wr->mad_agent_priv;
1976 list_del(&mad_send_wr->agent_list);
1977
1978 delay = mad_send_wr->timeout;
1979 mad_send_wr->timeout += jiffies;
1980
1981 if (delay) {
1982 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1983 temp_mad_send_wr = list_entry(list_item,
1984 struct ib_mad_send_wr_private,
1985 agent_list);
1986 if (time_after(mad_send_wr->timeout,
1987 temp_mad_send_wr->timeout))
1988 break;
1989 }
1990 }
1991 else
1992 list_item = &mad_agent_priv->wait_list;
1993 list_add(&mad_send_wr->agent_list, list_item);
1994
1995 /* Reschedule a work item if we have a shorter timeout */
1996 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1997 cancel_delayed_work(&mad_agent_priv->timed_work);
1998 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1999 &mad_agent_priv->timed_work, delay);
2000 }
2001 }
2002
2003 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2004 int timeout_ms)
2005 {
2006 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2007 wait_for_response(mad_send_wr);
2008 }
2009
2010 /*
2011 * Process a send work completion
2012 */
2013 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2014 struct ib_mad_send_wc *mad_send_wc)
2015 {
2016 struct ib_mad_agent_private *mad_agent_priv;
2017 unsigned long flags;
2018 int ret;
2019
2020 mad_agent_priv = mad_send_wr->mad_agent_priv;
2021 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2022 if (mad_agent_priv->agent.rmpp_version) {
2023 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2024 if (ret == IB_RMPP_RESULT_CONSUMED)
2025 goto done;
2026 } else
2027 ret = IB_RMPP_RESULT_UNHANDLED;
2028
2029 if (mad_send_wc->status != IB_WC_SUCCESS &&
2030 mad_send_wr->status == IB_WC_SUCCESS) {
2031 mad_send_wr->status = mad_send_wc->status;
2032 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2033 }
2034
2035 if (--mad_send_wr->refcount > 0) {
2036 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2037 mad_send_wr->status == IB_WC_SUCCESS) {
2038 wait_for_response(mad_send_wr);
2039 }
2040 goto done;
2041 }
2042
2043 /* Remove send from MAD agent and notify client of completion */
2044 list_del(&mad_send_wr->agent_list);
2045 adjust_timeout(mad_agent_priv);
2046 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2047
2048 if (mad_send_wr->status != IB_WC_SUCCESS )
2049 mad_send_wc->status = mad_send_wr->status;
2050 if (ret == IB_RMPP_RESULT_INTERNAL)
2051 ib_rmpp_send_handler(mad_send_wc);
2052 else
2053 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2054 mad_send_wc);
2055
2056 /* Release reference on agent taken when sending */
2057 deref_mad_agent(mad_agent_priv);
2058 return;
2059 done:
2060 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2061 }
2062
2063 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2064 struct ib_wc *wc)
2065 {
2066 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2067 struct ib_mad_list_head *mad_list;
2068 struct ib_mad_qp_info *qp_info;
2069 struct ib_mad_queue *send_queue;
2070 struct ib_send_wr *bad_send_wr;
2071 struct ib_mad_send_wc mad_send_wc;
2072 unsigned long flags;
2073 int ret;
2074
2075 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2076 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2077 mad_list);
2078 send_queue = mad_list->mad_queue;
2079 qp_info = send_queue->qp_info;
2080
2081 retry:
2082 dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
2083 pci_unmap_addr(mad_send_wr, header_mapping),
2084 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2085 dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
2086 pci_unmap_addr(mad_send_wr, payload_mapping),
2087 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2088 queued_send_wr = NULL;
2089 spin_lock_irqsave(&send_queue->lock, flags);
2090 list_del(&mad_list->list);
2091
2092 /* Move queued send to the send queue */
2093 if (send_queue->count-- > send_queue->max_active) {
2094 mad_list = container_of(qp_info->overflow_list.next,
2095 struct ib_mad_list_head, list);
2096 queued_send_wr = container_of(mad_list,
2097 struct ib_mad_send_wr_private,
2098 mad_list);
2099 list_move_tail(&mad_list->list, &send_queue->list);
2100 }
2101 spin_unlock_irqrestore(&send_queue->lock, flags);
2102
2103 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2104 mad_send_wc.status = wc->status;
2105 mad_send_wc.vendor_err = wc->vendor_err;
2106 if (atomic_read(&qp_info->snoop_count))
2107 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2108 IB_MAD_SNOOP_SEND_COMPLETIONS);
2109 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2110
2111 if (queued_send_wr) {
2112 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2113 &bad_send_wr);
2114 if (ret) {
2115 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2116 mad_send_wr = queued_send_wr;
2117 wc->status = IB_WC_LOC_QP_OP_ERR;
2118 goto retry;
2119 }
2120 }
2121 }
2122
2123 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2124 {
2125 struct ib_mad_send_wr_private *mad_send_wr;
2126 struct ib_mad_list_head *mad_list;
2127 unsigned long flags;
2128
2129 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2130 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2131 mad_send_wr = container_of(mad_list,
2132 struct ib_mad_send_wr_private,
2133 mad_list);
2134 mad_send_wr->retry = 1;
2135 }
2136 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2137 }
2138
2139 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2140 struct ib_wc *wc)
2141 {
2142 struct ib_mad_list_head *mad_list;
2143 struct ib_mad_qp_info *qp_info;
2144 struct ib_mad_send_wr_private *mad_send_wr;
2145 int ret;
2146
2147 /* Determine if failure was a send or receive */
2148 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2149 qp_info = mad_list->mad_queue->qp_info;
2150 if (mad_list->mad_queue == &qp_info->recv_queue)
2151 /*
2152 * Receive errors indicate that the QP has entered the error
2153 * state - error handling/shutdown code will cleanup
2154 */
2155 return;
2156
2157 /*
2158 * Send errors will transition the QP to SQE - move
2159 * QP to RTS and repost flushed work requests
2160 */
2161 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2162 mad_list);
2163 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2164 if (mad_send_wr->retry) {
2165 /* Repost send */
2166 struct ib_send_wr *bad_send_wr;
2167
2168 mad_send_wr->retry = 0;
2169 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2170 &bad_send_wr);
2171 if (ret)
2172 ib_mad_send_done_handler(port_priv, wc);
2173 } else
2174 ib_mad_send_done_handler(port_priv, wc);
2175 } else {
2176 struct ib_qp_attr *attr;
2177
2178 /* Transition QP to RTS and fail offending send */
2179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2180 if (attr) {
2181 attr->qp_state = IB_QPS_RTS;
2182 attr->cur_qp_state = IB_QPS_SQE;
2183 ret = ib_modify_qp(qp_info->qp, attr,
2184 IB_QP_STATE | IB_QP_CUR_STATE);
2185 kfree(attr);
2186 if (ret)
2187 printk(KERN_ERR PFX "mad_error_handler - "
2188 "ib_modify_qp to RTS : %d\n", ret);
2189 else
2190 mark_sends_for_retry(qp_info);
2191 }
2192 ib_mad_send_done_handler(port_priv, wc);
2193 }
2194 }
2195
2196 /*
2197 * IB MAD completion callback
2198 */
2199 static void ib_mad_completion_handler(void *data)
2200 {
2201 struct ib_mad_port_private *port_priv;
2202 struct ib_wc wc;
2203
2204 port_priv = (struct ib_mad_port_private *)data;
2205 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2206
2207 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2208 if (wc.status == IB_WC_SUCCESS) {
2209 switch (wc.opcode) {
2210 case IB_WC_SEND:
2211 ib_mad_send_done_handler(port_priv, &wc);
2212 break;
2213 case IB_WC_RECV:
2214 ib_mad_recv_done_handler(port_priv, &wc);
2215 break;
2216 default:
2217 BUG_ON(1);
2218 break;
2219 }
2220 } else
2221 mad_error_handler(port_priv, &wc);
2222 }
2223 }
2224
2225 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2226 {
2227 unsigned long flags;
2228 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2229 struct ib_mad_send_wc mad_send_wc;
2230 struct list_head cancel_list;
2231
2232 INIT_LIST_HEAD(&cancel_list);
2233
2234 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2235 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2236 &mad_agent_priv->send_list, agent_list) {
2237 if (mad_send_wr->status == IB_WC_SUCCESS) {
2238 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2239 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2240 }
2241 }
2242
2243 /* Empty wait list to prevent receives from finding a request */
2244 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2245 /* Empty local completion list as well */
2246 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2247 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2248
2249 /* Report all cancelled requests */
2250 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2251 mad_send_wc.vendor_err = 0;
2252
2253 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2254 &cancel_list, agent_list) {
2255 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2256 list_del(&mad_send_wr->agent_list);
2257 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2258 &mad_send_wc);
2259 atomic_dec(&mad_agent_priv->refcount);
2260 }
2261 }
2262
2263 static struct ib_mad_send_wr_private*
2264 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2265 struct ib_mad_send_buf *send_buf)
2266 {
2267 struct ib_mad_send_wr_private *mad_send_wr;
2268
2269 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2270 agent_list) {
2271 if (&mad_send_wr->send_buf == send_buf)
2272 return mad_send_wr;
2273 }
2274
2275 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2276 agent_list) {
2277 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2278 &mad_send_wr->send_buf == send_buf)
2279 return mad_send_wr;
2280 }
2281 return NULL;
2282 }
2283
2284 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2285 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2286 {
2287 struct ib_mad_agent_private *mad_agent_priv;
2288 struct ib_mad_send_wr_private *mad_send_wr;
2289 unsigned long flags;
2290 int active;
2291
2292 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2293 agent);
2294 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2295 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2296 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2297 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2298 return -EINVAL;
2299 }
2300
2301 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2302 if (!timeout_ms) {
2303 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2304 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2305 }
2306
2307 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2308 if (active)
2309 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2310 else
2311 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2312
2313 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2314 return 0;
2315 }
2316 EXPORT_SYMBOL(ib_modify_mad);
2317
2318 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2319 struct ib_mad_send_buf *send_buf)
2320 {
2321 ib_modify_mad(mad_agent, send_buf, 0);
2322 }
2323 EXPORT_SYMBOL(ib_cancel_mad);
2324
2325 static void local_completions(void *data)
2326 {
2327 struct ib_mad_agent_private *mad_agent_priv;
2328 struct ib_mad_local_private *local;
2329 struct ib_mad_agent_private *recv_mad_agent;
2330 unsigned long flags;
2331 int recv = 0;
2332 struct ib_wc wc;
2333 struct ib_mad_send_wc mad_send_wc;
2334
2335 mad_agent_priv = (struct ib_mad_agent_private *)data;
2336
2337 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2338 while (!list_empty(&mad_agent_priv->local_list)) {
2339 local = list_entry(mad_agent_priv->local_list.next,
2340 struct ib_mad_local_private,
2341 completion_list);
2342 list_del(&local->completion_list);
2343 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2344 if (local->mad_priv) {
2345 recv_mad_agent = local->recv_mad_agent;
2346 if (!recv_mad_agent) {
2347 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2348 goto local_send_completion;
2349 }
2350
2351 recv = 1;
2352 /*
2353 * Defined behavior is to complete response
2354 * before request
2355 */
2356 build_smp_wc((unsigned long) local->mad_send_wr,
2357 be16_to_cpu(IB_LID_PERMISSIVE),
2358 0, recv_mad_agent->agent.port_num, &wc);
2359
2360 local->mad_priv->header.recv_wc.wc = &wc;
2361 local->mad_priv->header.recv_wc.mad_len =
2362 sizeof(struct ib_mad);
2363 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2364 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2365 &local->mad_priv->header.recv_wc.rmpp_list);
2366 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2367 local->mad_priv->header.recv_wc.recv_buf.mad =
2368 &local->mad_priv->mad.mad;
2369 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2370 snoop_recv(recv_mad_agent->qp_info,
2371 &local->mad_priv->header.recv_wc,
2372 IB_MAD_SNOOP_RECVS);
2373 recv_mad_agent->agent.recv_handler(
2374 &recv_mad_agent->agent,
2375 &local->mad_priv->header.recv_wc);
2376 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2377 atomic_dec(&recv_mad_agent->refcount);
2378 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2379 }
2380
2381 local_send_completion:
2382 /* Complete send */
2383 mad_send_wc.status = IB_WC_SUCCESS;
2384 mad_send_wc.vendor_err = 0;
2385 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2386 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2387 snoop_send(mad_agent_priv->qp_info,
2388 &local->mad_send_wr->send_buf,
2389 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2390 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2391 &mad_send_wc);
2392
2393 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2394 atomic_dec(&mad_agent_priv->refcount);
2395 if (!recv)
2396 kmem_cache_free(ib_mad_cache, local->mad_priv);
2397 kfree(local);
2398 }
2399 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2400 }
2401
2402 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2403 {
2404 int ret;
2405
2406 if (!mad_send_wr->retries--)
2407 return -ETIMEDOUT;
2408
2409 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2410
2411 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2412 ret = ib_retry_rmpp(mad_send_wr);
2413 switch (ret) {
2414 case IB_RMPP_RESULT_UNHANDLED:
2415 ret = ib_send_mad(mad_send_wr);
2416 break;
2417 case IB_RMPP_RESULT_CONSUMED:
2418 ret = 0;
2419 break;
2420 default:
2421 ret = -ECOMM;
2422 break;
2423 }
2424 } else
2425 ret = ib_send_mad(mad_send_wr);
2426
2427 if (!ret) {
2428 mad_send_wr->refcount++;
2429 list_add_tail(&mad_send_wr->agent_list,
2430 &mad_send_wr->mad_agent_priv->send_list);
2431 }
2432 return ret;
2433 }
2434
2435 static void timeout_sends(void *data)
2436 {
2437 struct ib_mad_agent_private *mad_agent_priv;
2438 struct ib_mad_send_wr_private *mad_send_wr;
2439 struct ib_mad_send_wc mad_send_wc;
2440 unsigned long flags, delay;
2441
2442 mad_agent_priv = (struct ib_mad_agent_private *)data;
2443 mad_send_wc.vendor_err = 0;
2444
2445 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2446 while (!list_empty(&mad_agent_priv->wait_list)) {
2447 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2448 struct ib_mad_send_wr_private,
2449 agent_list);
2450
2451 if (time_after(mad_send_wr->timeout, jiffies)) {
2452 delay = mad_send_wr->timeout - jiffies;
2453 if ((long)delay <= 0)
2454 delay = 1;
2455 queue_delayed_work(mad_agent_priv->qp_info->
2456 port_priv->wq,
2457 &mad_agent_priv->timed_work, delay);
2458 break;
2459 }
2460
2461 list_del(&mad_send_wr->agent_list);
2462 if (mad_send_wr->status == IB_WC_SUCCESS &&
2463 !retry_send(mad_send_wr))
2464 continue;
2465
2466 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2467
2468 if (mad_send_wr->status == IB_WC_SUCCESS)
2469 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2470 else
2471 mad_send_wc.status = mad_send_wr->status;
2472 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2473 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2474 &mad_send_wc);
2475
2476 atomic_dec(&mad_agent_priv->refcount);
2477 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2478 }
2479 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2480 }
2481
2482 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2483 {
2484 struct ib_mad_port_private *port_priv = cq->cq_context;
2485 unsigned long flags;
2486
2487 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2488 if (!list_empty(&port_priv->port_list))
2489 queue_work(port_priv->wq, &port_priv->work);
2490 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2491 }
2492
2493 /*
2494 * Allocate receive MADs and post receive WRs for them
2495 */
2496 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2497 struct ib_mad_private *mad)
2498 {
2499 unsigned long flags;
2500 int post, ret;
2501 struct ib_mad_private *mad_priv;
2502 struct ib_sge sg_list;
2503 struct ib_recv_wr recv_wr, *bad_recv_wr;
2504 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2505
2506 /* Initialize common scatter list fields */
2507 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2508 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2509
2510 /* Initialize common receive WR fields */
2511 recv_wr.next = NULL;
2512 recv_wr.sg_list = &sg_list;
2513 recv_wr.num_sge = 1;
2514
2515 do {
2516 /* Allocate and map receive buffer */
2517 if (mad) {
2518 mad_priv = mad;
2519 mad = NULL;
2520 } else {
2521 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2522 if (!mad_priv) {
2523 printk(KERN_ERR PFX "No memory for receive buffer\n");
2524 ret = -ENOMEM;
2525 break;
2526 }
2527 }
2528 sg_list.addr = dma_map_single(qp_info->port_priv->
2529 device->dma_device,
2530 &mad_priv->grh,
2531 sizeof *mad_priv -
2532 sizeof mad_priv->header,
2533 DMA_FROM_DEVICE);
2534 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2535 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2536 mad_priv->header.mad_list.mad_queue = recv_queue;
2537
2538 /* Post receive WR */
2539 spin_lock_irqsave(&recv_queue->lock, flags);
2540 post = (++recv_queue->count < recv_queue->max_active);
2541 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2542 spin_unlock_irqrestore(&recv_queue->lock, flags);
2543 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2544 if (ret) {
2545 spin_lock_irqsave(&recv_queue->lock, flags);
2546 list_del(&mad_priv->header.mad_list.list);
2547 recv_queue->count--;
2548 spin_unlock_irqrestore(&recv_queue->lock, flags);
2549 dma_unmap_single(qp_info->port_priv->device->dma_device,
2550 pci_unmap_addr(&mad_priv->header,
2551 mapping),
2552 sizeof *mad_priv -
2553 sizeof mad_priv->header,
2554 DMA_FROM_DEVICE);
2555 kmem_cache_free(ib_mad_cache, mad_priv);
2556 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2557 break;
2558 }
2559 } while (post);
2560
2561 return ret;
2562 }
2563
2564 /*
2565 * Return all the posted receive MADs
2566 */
2567 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2568 {
2569 struct ib_mad_private_header *mad_priv_hdr;
2570 struct ib_mad_private *recv;
2571 struct ib_mad_list_head *mad_list;
2572
2573 while (!list_empty(&qp_info->recv_queue.list)) {
2574
2575 mad_list = list_entry(qp_info->recv_queue.list.next,
2576 struct ib_mad_list_head, list);
2577 mad_priv_hdr = container_of(mad_list,
2578 struct ib_mad_private_header,
2579 mad_list);
2580 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2581 header);
2582
2583 /* Remove from posted receive MAD list */
2584 list_del(&mad_list->list);
2585
2586 dma_unmap_single(qp_info->port_priv->device->dma_device,
2587 pci_unmap_addr(&recv->header, mapping),
2588 sizeof(struct ib_mad_private) -
2589 sizeof(struct ib_mad_private_header),
2590 DMA_FROM_DEVICE);
2591 kmem_cache_free(ib_mad_cache, recv);
2592 }
2593
2594 qp_info->recv_queue.count = 0;
2595 }
2596
2597 /*
2598 * Start the port
2599 */
2600 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2601 {
2602 int ret, i;
2603 struct ib_qp_attr *attr;
2604 struct ib_qp *qp;
2605
2606 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2607 if (!attr) {
2608 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2609 return -ENOMEM;
2610 }
2611
2612 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2613 qp = port_priv->qp_info[i].qp;
2614 /*
2615 * PKey index for QP1 is irrelevant but
2616 * one is needed for the Reset to Init transition
2617 */
2618 attr->qp_state = IB_QPS_INIT;
2619 attr->pkey_index = 0;
2620 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2621 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2622 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2623 if (ret) {
2624 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2625 "INIT: %d\n", i, ret);
2626 goto out;
2627 }
2628
2629 attr->qp_state = IB_QPS_RTR;
2630 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2631 if (ret) {
2632 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2633 "RTR: %d\n", i, ret);
2634 goto out;
2635 }
2636
2637 attr->qp_state = IB_QPS_RTS;
2638 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2639 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2640 if (ret) {
2641 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2642 "RTS: %d\n", i, ret);
2643 goto out;
2644 }
2645 }
2646
2647 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2648 if (ret) {
2649 printk(KERN_ERR PFX "Failed to request completion "
2650 "notification: %d\n", ret);
2651 goto out;
2652 }
2653
2654 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2655 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2656 if (ret) {
2657 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2658 goto out;
2659 }
2660 }
2661 out:
2662 kfree(attr);
2663 return ret;
2664 }
2665
2666 static void qp_event_handler(struct ib_event *event, void *qp_context)
2667 {
2668 struct ib_mad_qp_info *qp_info = qp_context;
2669
2670 /* It's worse than that! He's dead, Jim! */
2671 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2672 event->event, qp_info->qp->qp_num);
2673 }
2674
2675 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2676 struct ib_mad_queue *mad_queue)
2677 {
2678 mad_queue->qp_info = qp_info;
2679 mad_queue->count = 0;
2680 spin_lock_init(&mad_queue->lock);
2681 INIT_LIST_HEAD(&mad_queue->list);
2682 }
2683
2684 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2685 struct ib_mad_qp_info *qp_info)
2686 {
2687 qp_info->port_priv = port_priv;
2688 init_mad_queue(qp_info, &qp_info->send_queue);
2689 init_mad_queue(qp_info, &qp_info->recv_queue);
2690 INIT_LIST_HEAD(&qp_info->overflow_list);
2691 spin_lock_init(&qp_info->snoop_lock);
2692 qp_info->snoop_table = NULL;
2693 qp_info->snoop_table_size = 0;
2694 atomic_set(&qp_info->snoop_count, 0);
2695 }
2696
2697 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2698 enum ib_qp_type qp_type)
2699 {
2700 struct ib_qp_init_attr qp_init_attr;
2701 int ret;
2702
2703 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2704 qp_init_attr.send_cq = qp_info->port_priv->cq;
2705 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2706 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2707 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2708 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2709 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2710 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2711 qp_init_attr.qp_type = qp_type;
2712 qp_init_attr.port_num = qp_info->port_priv->port_num;
2713 qp_init_attr.qp_context = qp_info;
2714 qp_init_attr.event_handler = qp_event_handler;
2715 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2716 if (IS_ERR(qp_info->qp)) {
2717 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2718 get_spl_qp_index(qp_type));
2719 ret = PTR_ERR(qp_info->qp);
2720 goto error;
2721 }
2722 /* Use minimum queue sizes unless the CQ is resized */
2723 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2724 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2725 return 0;
2726
2727 error:
2728 return ret;
2729 }
2730
2731 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2732 {
2733 ib_destroy_qp(qp_info->qp);
2734 kfree(qp_info->snoop_table);
2735 }
2736
2737 /*
2738 * Open the port
2739 * Create the QP, PD, MR, and CQ if needed
2740 */
2741 static int ib_mad_port_open(struct ib_device *device,
2742 int port_num)
2743 {
2744 int ret, cq_size;
2745 struct ib_mad_port_private *port_priv;
2746 unsigned long flags;
2747 char name[sizeof "ib_mad123"];
2748
2749 /* Create new device info */
2750 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2751 if (!port_priv) {
2752 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2753 return -ENOMEM;
2754 }
2755
2756 port_priv->device = device;
2757 port_priv->port_num = port_num;
2758 spin_lock_init(&port_priv->reg_lock);
2759 INIT_LIST_HEAD(&port_priv->agent_list);
2760 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2761 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2762
2763 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2764 port_priv->cq = ib_create_cq(port_priv->device,
2765 ib_mad_thread_completion_handler,
2766 NULL, port_priv, cq_size);
2767 if (IS_ERR(port_priv->cq)) {
2768 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2769 ret = PTR_ERR(port_priv->cq);
2770 goto error3;
2771 }
2772
2773 port_priv->pd = ib_alloc_pd(device);
2774 if (IS_ERR(port_priv->pd)) {
2775 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2776 ret = PTR_ERR(port_priv->pd);
2777 goto error4;
2778 }
2779
2780 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2781 if (IS_ERR(port_priv->mr)) {
2782 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2783 ret = PTR_ERR(port_priv->mr);
2784 goto error5;
2785 }
2786
2787 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2788 if (ret)
2789 goto error6;
2790 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2791 if (ret)
2792 goto error7;
2793
2794 snprintf(name, sizeof name, "ib_mad%d", port_num);
2795 port_priv->wq = create_singlethread_workqueue(name);
2796 if (!port_priv->wq) {
2797 ret = -ENOMEM;
2798 goto error8;
2799 }
2800 INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2801
2802 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2803 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2804 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2805
2806 ret = ib_mad_port_start(port_priv);
2807 if (ret) {
2808 printk(KERN_ERR PFX "Couldn't start port\n");
2809 goto error9;
2810 }
2811
2812 return 0;
2813
2814 error9:
2815 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2816 list_del_init(&port_priv->port_list);
2817 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2818
2819 destroy_workqueue(port_priv->wq);
2820 error8:
2821 destroy_mad_qp(&port_priv->qp_info[1]);
2822 error7:
2823 destroy_mad_qp(&port_priv->qp_info[0]);
2824 error6:
2825 ib_dereg_mr(port_priv->mr);
2826 error5:
2827 ib_dealloc_pd(port_priv->pd);
2828 error4:
2829 ib_destroy_cq(port_priv->cq);
2830 cleanup_recv_queue(&port_priv->qp_info[1]);
2831 cleanup_recv_queue(&port_priv->qp_info[0]);
2832 error3:
2833 kfree(port_priv);
2834
2835 return ret;
2836 }
2837
2838 /*
2839 * Close the port
2840 * If there are no classes using the port, free the port
2841 * resources (CQ, MR, PD, QP) and remove the port's info structure
2842 */
2843 static int ib_mad_port_close(struct ib_device *device, int port_num)
2844 {
2845 struct ib_mad_port_private *port_priv;
2846 unsigned long flags;
2847
2848 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2849 port_priv = __ib_get_mad_port(device, port_num);
2850 if (port_priv == NULL) {
2851 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2852 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2853 return -ENODEV;
2854 }
2855 list_del_init(&port_priv->port_list);
2856 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2857
2858 destroy_workqueue(port_priv->wq);
2859 destroy_mad_qp(&port_priv->qp_info[1]);
2860 destroy_mad_qp(&port_priv->qp_info[0]);
2861 ib_dereg_mr(port_priv->mr);
2862 ib_dealloc_pd(port_priv->pd);
2863 ib_destroy_cq(port_priv->cq);
2864 cleanup_recv_queue(&port_priv->qp_info[1]);
2865 cleanup_recv_queue(&port_priv->qp_info[0]);
2866 /* XXX: Handle deallocation of MAD registration tables */
2867
2868 kfree(port_priv);
2869
2870 return 0;
2871 }
2872
2873 static void ib_mad_init_device(struct ib_device *device)
2874 {
2875 int start, end, i;
2876
2877 if (device->node_type == IB_NODE_SWITCH) {
2878 start = 0;
2879 end = 0;
2880 } else {
2881 start = 1;
2882 end = device->phys_port_cnt;
2883 }
2884
2885 for (i = start; i <= end; i++) {
2886 if (ib_mad_port_open(device, i)) {
2887 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2888 device->name, i);
2889 goto error;
2890 }
2891 if (ib_agent_port_open(device, i)) {
2892 printk(KERN_ERR PFX "Couldn't open %s port %d "
2893 "for agents\n",
2894 device->name, i);
2895 goto error_agent;
2896 }
2897 }
2898 return;
2899
2900 error_agent:
2901 if (ib_mad_port_close(device, i))
2902 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2903 device->name, i);
2904
2905 error:
2906 i--;
2907
2908 while (i >= start) {
2909 if (ib_agent_port_close(device, i))
2910 printk(KERN_ERR PFX "Couldn't close %s port %d "
2911 "for agents\n",
2912 device->name, i);
2913 if (ib_mad_port_close(device, i))
2914 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2915 device->name, i);
2916 i--;
2917 }
2918 }
2919
2920 static void ib_mad_remove_device(struct ib_device *device)
2921 {
2922 int i, num_ports, cur_port;
2923
2924 if (device->node_type == IB_NODE_SWITCH) {
2925 num_ports = 1;
2926 cur_port = 0;
2927 } else {
2928 num_ports = device->phys_port_cnt;
2929 cur_port = 1;
2930 }
2931 for (i = 0; i < num_ports; i++, cur_port++) {
2932 if (ib_agent_port_close(device, cur_port))
2933 printk(KERN_ERR PFX "Couldn't close %s port %d "
2934 "for agents\n",
2935 device->name, cur_port);
2936 if (ib_mad_port_close(device, cur_port))
2937 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2938 device->name, cur_port);
2939 }
2940 }
2941
2942 static struct ib_client mad_client = {
2943 .name = "mad",
2944 .add = ib_mad_init_device,
2945 .remove = ib_mad_remove_device
2946 };
2947
2948 static int __init ib_mad_init_module(void)
2949 {
2950 int ret;
2951
2952 spin_lock_init(&ib_mad_port_list_lock);
2953
2954 ib_mad_cache = kmem_cache_create("ib_mad",
2955 sizeof(struct ib_mad_private),
2956 0,
2957 SLAB_HWCACHE_ALIGN,
2958 NULL,
2959 NULL);
2960 if (!ib_mad_cache) {
2961 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2962 ret = -ENOMEM;
2963 goto error1;
2964 }
2965
2966 INIT_LIST_HEAD(&ib_mad_port_list);
2967
2968 if (ib_register_client(&mad_client)) {
2969 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2970 ret = -EINVAL;
2971 goto error2;
2972 }
2973
2974 return 0;
2975
2976 error2:
2977 kmem_cache_destroy(ib_mad_cache);
2978 error1:
2979 return ret;
2980 }
2981
2982 static void __exit ib_mad_cleanup_module(void)
2983 {
2984 ib_unregister_client(&mad_client);
2985
2986 if (kmem_cache_destroy(ib_mad_cache)) {
2987 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2988 }
2989 }
2990
2991 module_init(ib_mad_init_module);
2992 module_exit(ib_mad_cleanup_module);
2993
Linux kernel - Deliverables
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