?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] IB: Fix timeout/cancelled MAD handling
[usb.git] / drivers / infiniband / core / mad.c
blob7af8f7f8784906d9342098abb143a681abf25115
1 /*
2 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id: mad.c 1389 2004-12-27 22:56:47Z roland $
33 */
34
35 #include <linux/dma-mapping.h>
36
37 #include "mad_priv.h"
38 #include "smi.h"
39 #include "agent.h"
40
41 MODULE_LICENSE("Dual BSD/GPL");
42 MODULE_DESCRIPTION("kernel IB MAD API");
43 MODULE_AUTHOR("Hal Rosenstock");
44 MODULE_AUTHOR("Sean Hefty");
45
46
47 kmem_cache_t *ib_mad_cache;
48 static struct list_head ib_mad_port_list;
49 static u32 ib_mad_client_id = 0;
50
51 /* Port list lock */
52 static spinlock_t ib_mad_port_list_lock;
53
54
55 /* Forward declarations */
56 static int method_in_use(struct ib_mad_mgmt_method_table **method,
57 struct ib_mad_reg_req *mad_reg_req);
58 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
59 static struct ib_mad_agent_private *find_mad_agent(
60 struct ib_mad_port_private *port_priv,
61 struct ib_mad *mad);
62 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
63 struct ib_mad_private *mad);
64 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
65 static void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
66 struct ib_mad_send_wc *mad_send_wc);
67 static void timeout_sends(void *data);
68 static void cancel_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)
200 goto error1; /* XXX: until RMPP implemented */
201
202 /* Validate MAD registration request if supplied */
203 if (mad_reg_req) {
204 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
205 goto error1;
206 if (!recv_handler)
207 goto error1;
208 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
209 /*
210 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
211 * one in this range currently allowed
212 */
213 if (mad_reg_req->mgmt_class !=
214 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
215 goto error1;
216 } else if (mad_reg_req->mgmt_class == 0) {
217 /*
218 * Class 0 is reserved in IBA and is used for
219 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
220 */
221 goto error1;
222 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
223 /*
224 * If class is in "new" vendor range,
225 * ensure supplied OUI is not zero
226 */
227 if (!is_vendor_oui(mad_reg_req->oui))
228 goto error1;
229 }
230 /* Make sure class supplied is consistent with QP type */
231 if (qp_type == IB_QPT_SMI) {
232 if ((mad_reg_req->mgmt_class !=
233 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
234 (mad_reg_req->mgmt_class !=
235 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
236 goto error1;
237 } else {
238 if ((mad_reg_req->mgmt_class ==
239 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
240 (mad_reg_req->mgmt_class ==
241 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
242 goto error1;
243 }
244 } else {
245 /* No registration request supplied */
246 if (!send_handler)
247 goto error1;
248 }
249
250 /* Validate device and port */
251 port_priv = ib_get_mad_port(device, port_num);
252 if (!port_priv) {
253 ret = ERR_PTR(-ENODEV);
254 goto error1;
255 }
256
257 /* Allocate structures */
258 mad_agent_priv = kmalloc(sizeof *mad_agent_priv, GFP_KERNEL);
259 if (!mad_agent_priv) {
260 ret = ERR_PTR(-ENOMEM);
261 goto error1;
262 }
263 memset(mad_agent_priv, 0, sizeof *mad_agent_priv);
264
265 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
266 IB_ACCESS_LOCAL_WRITE);
267 if (IS_ERR(mad_agent_priv->agent.mr)) {
268 ret = ERR_PTR(-ENOMEM);
269 goto error2;
270 }
271
272 if (mad_reg_req) {
273 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
274 if (!reg_req) {
275 ret = ERR_PTR(-ENOMEM);
276 goto error3;
277 }
278 /* Make a copy of the MAD registration request */
279 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
280 }
281
282 /* Now, fill in the various structures */
283 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
284 mad_agent_priv->reg_req = reg_req;
285 mad_agent_priv->rmpp_version = rmpp_version;
286 mad_agent_priv->agent.device = device;
287 mad_agent_priv->agent.recv_handler = recv_handler;
288 mad_agent_priv->agent.send_handler = send_handler;
289 mad_agent_priv->agent.context = context;
290 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
291 mad_agent_priv->agent.port_num = port_num;
292
293 spin_lock_irqsave(&port_priv->reg_lock, flags);
294 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
295
296 /*
297 * Make sure MAD registration (if supplied)
298 * is non overlapping with any existing ones
299 */
300 if (mad_reg_req) {
301 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
302 if (!is_vendor_class(mgmt_class)) {
303 class = port_priv->version[mad_reg_req->
304 mgmt_class_version].class;
305 if (class) {
306 method = class->method_table[mgmt_class];
307 if (method) {
308 if (method_in_use(&method,
309 mad_reg_req))
310 goto error4;
311 }
312 }
313 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
314 mgmt_class);
315 } else {
316 /* "New" vendor class range */
317 vendor = port_priv->version[mad_reg_req->
318 mgmt_class_version].vendor;
319 if (vendor) {
320 vclass = vendor_class_index(mgmt_class);
321 vendor_class = vendor->vendor_class[vclass];
322 if (vendor_class) {
323 if (is_vendor_method_in_use(
324 vendor_class,
325 mad_reg_req))
326 goto error4;
327 }
328 }
329 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
330 }
331 if (ret2) {
332 ret = ERR_PTR(ret2);
333 goto error4;
334 }
335 }
336
337 /* Add mad agent into port's agent list */
338 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
339 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
340
341 spin_lock_init(&mad_agent_priv->lock);
342 INIT_LIST_HEAD(&mad_agent_priv->send_list);
343 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
344 INIT_LIST_HEAD(&mad_agent_priv->done_list);
345 INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
346 INIT_LIST_HEAD(&mad_agent_priv->local_list);
347 INIT_WORK(&mad_agent_priv->local_work, local_completions,
348 mad_agent_priv);
349 INIT_LIST_HEAD(&mad_agent_priv->canceled_list);
350 INIT_WORK(&mad_agent_priv->canceled_work, cancel_sends, mad_agent_priv);
351 atomic_set(&mad_agent_priv->refcount, 1);
352 init_waitqueue_head(&mad_agent_priv->wait);
353
354 return &mad_agent_priv->agent;
355
356 error4:
357 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
358 kfree(reg_req);
359 error3:
360 kfree(mad_agent_priv);
361 error2:
362 ib_dereg_mr(mad_agent_priv->agent.mr);
363 error1:
364 return ret;
365 }
366 EXPORT_SYMBOL(ib_register_mad_agent);
367
368 static inline int is_snooping_sends(int mad_snoop_flags)
369 {
370 return (mad_snoop_flags &
371 (/*IB_MAD_SNOOP_POSTED_SENDS |
372 IB_MAD_SNOOP_RMPP_SENDS |*/
373 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
374 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
375 }
376
377 static inline int is_snooping_recvs(int mad_snoop_flags)
378 {
379 return (mad_snoop_flags &
380 (IB_MAD_SNOOP_RECVS /*|
381 IB_MAD_SNOOP_RMPP_RECVS*/));
382 }
383
384 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
385 struct ib_mad_snoop_private *mad_snoop_priv)
386 {
387 struct ib_mad_snoop_private **new_snoop_table;
388 unsigned long flags;
389 int i;
390
391 spin_lock_irqsave(&qp_info->snoop_lock, flags);
392 /* Check for empty slot in array. */
393 for (i = 0; i < qp_info->snoop_table_size; i++)
394 if (!qp_info->snoop_table[i])
395 break;
396
397 if (i == qp_info->snoop_table_size) {
398 /* Grow table. */
399 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
400 qp_info->snoop_table_size + 1,
401 GFP_ATOMIC);
402 if (!new_snoop_table) {
403 i = -ENOMEM;
404 goto out;
405 }
406 if (qp_info->snoop_table) {
407 memcpy(new_snoop_table, qp_info->snoop_table,
408 sizeof mad_snoop_priv *
409 qp_info->snoop_table_size);
410 kfree(qp_info->snoop_table);
411 }
412 qp_info->snoop_table = new_snoop_table;
413 qp_info->snoop_table_size++;
414 }
415 qp_info->snoop_table[i] = mad_snoop_priv;
416 atomic_inc(&qp_info->snoop_count);
417 out:
418 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
419 return i;
420 }
421
422 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
423 u8 port_num,
424 enum ib_qp_type qp_type,
425 int mad_snoop_flags,
426 ib_mad_snoop_handler snoop_handler,
427 ib_mad_recv_handler recv_handler,
428 void *context)
429 {
430 struct ib_mad_port_private *port_priv;
431 struct ib_mad_agent *ret;
432 struct ib_mad_snoop_private *mad_snoop_priv;
433 int qpn;
434
435 /* Validate parameters */
436 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
437 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
438 ret = ERR_PTR(-EINVAL);
439 goto error1;
440 }
441 qpn = get_spl_qp_index(qp_type);
442 if (qpn == -1) {
443 ret = ERR_PTR(-EINVAL);
444 goto error1;
445 }
446 port_priv = ib_get_mad_port(device, port_num);
447 if (!port_priv) {
448 ret = ERR_PTR(-ENODEV);
449 goto error1;
450 }
451 /* Allocate structures */
452 mad_snoop_priv = kmalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
453 if (!mad_snoop_priv) {
454 ret = ERR_PTR(-ENOMEM);
455 goto error1;
456 }
457
458 /* Now, fill in the various structures */
459 memset(mad_snoop_priv, 0, sizeof *mad_snoop_priv);
460 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
461 mad_snoop_priv->agent.device = device;
462 mad_snoop_priv->agent.recv_handler = recv_handler;
463 mad_snoop_priv->agent.snoop_handler = snoop_handler;
464 mad_snoop_priv->agent.context = context;
465 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
466 mad_snoop_priv->agent.port_num = port_num;
467 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
468 init_waitqueue_head(&mad_snoop_priv->wait);
469 mad_snoop_priv->snoop_index = register_snoop_agent(
470 &port_priv->qp_info[qpn],
471 mad_snoop_priv);
472 if (mad_snoop_priv->snoop_index < 0) {
473 ret = ERR_PTR(mad_snoop_priv->snoop_index);
474 goto error2;
475 }
476
477 atomic_set(&mad_snoop_priv->refcount, 1);
478 return &mad_snoop_priv->agent;
479
480 error2:
481 kfree(mad_snoop_priv);
482 error1:
483 return ret;
484 }
485 EXPORT_SYMBOL(ib_register_mad_snoop);
486
487 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
488 {
489 struct ib_mad_port_private *port_priv;
490 unsigned long flags;
491
492 /* Note that we could still be handling received MADs */
493
494 /*
495 * Canceling all sends results in dropping received response
496 * MADs, preventing us from queuing additional work
497 */
498 cancel_mads(mad_agent_priv);
499 port_priv = mad_agent_priv->qp_info->port_priv;
500 cancel_delayed_work(&mad_agent_priv->timed_work);
501
502 spin_lock_irqsave(&port_priv->reg_lock, flags);
503 remove_mad_reg_req(mad_agent_priv);
504 list_del(&mad_agent_priv->agent_list);
505 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
506
507 flush_workqueue(port_priv->wq);
508
509 atomic_dec(&mad_agent_priv->refcount);
510 wait_event(mad_agent_priv->wait,
511 !atomic_read(&mad_agent_priv->refcount));
512
513 if (mad_agent_priv->reg_req)
514 kfree(mad_agent_priv->reg_req);
515 ib_dereg_mr(mad_agent_priv->agent.mr);
516 kfree(mad_agent_priv);
517 }
518
519 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
520 {
521 struct ib_mad_qp_info *qp_info;
522 unsigned long flags;
523
524 qp_info = mad_snoop_priv->qp_info;
525 spin_lock_irqsave(&qp_info->snoop_lock, flags);
526 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
527 atomic_dec(&qp_info->snoop_count);
528 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
529
530 atomic_dec(&mad_snoop_priv->refcount);
531 wait_event(mad_snoop_priv->wait,
532 !atomic_read(&mad_snoop_priv->refcount));
533
534 kfree(mad_snoop_priv);
535 }
536
537 /*
538 * ib_unregister_mad_agent - Unregisters a client from using MAD services
539 */
540 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
541 {
542 struct ib_mad_agent_private *mad_agent_priv;
543 struct ib_mad_snoop_private *mad_snoop_priv;
544
545 /* If the TID is zero, the agent can only snoop. */
546 if (mad_agent->hi_tid) {
547 mad_agent_priv = container_of(mad_agent,
548 struct ib_mad_agent_private,
549 agent);
550 unregister_mad_agent(mad_agent_priv);
551 } else {
552 mad_snoop_priv = container_of(mad_agent,
553 struct ib_mad_snoop_private,
554 agent);
555 unregister_mad_snoop(mad_snoop_priv);
556 }
557 return 0;
558 }
559 EXPORT_SYMBOL(ib_unregister_mad_agent);
560
561 static inline int response_mad(struct ib_mad *mad)
562 {
563 /* Trap represses are responses although response bit is reset */
564 return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
565 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
566 }
567
568 static void dequeue_mad(struct ib_mad_list_head *mad_list)
569 {
570 struct ib_mad_queue *mad_queue;
571 unsigned long flags;
572
573 BUG_ON(!mad_list->mad_queue);
574 mad_queue = mad_list->mad_queue;
575 spin_lock_irqsave(&mad_queue->lock, flags);
576 list_del(&mad_list->list);
577 mad_queue->count--;
578 spin_unlock_irqrestore(&mad_queue->lock, flags);
579 }
580
581 static void snoop_send(struct ib_mad_qp_info *qp_info,
582 struct ib_send_wr *send_wr,
583 struct ib_mad_send_wc *mad_send_wc,
584 int mad_snoop_flags)
585 {
586 struct ib_mad_snoop_private *mad_snoop_priv;
587 unsigned long flags;
588 int i;
589
590 spin_lock_irqsave(&qp_info->snoop_lock, flags);
591 for (i = 0; i < qp_info->snoop_table_size; i++) {
592 mad_snoop_priv = qp_info->snoop_table[i];
593 if (!mad_snoop_priv ||
594 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
595 continue;
596
597 atomic_inc(&mad_snoop_priv->refcount);
598 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
599 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
600 send_wr, mad_send_wc);
601 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
602 wake_up(&mad_snoop_priv->wait);
603 spin_lock_irqsave(&qp_info->snoop_lock, flags);
604 }
605 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
606 }
607
608 static void snoop_recv(struct ib_mad_qp_info *qp_info,
609 struct ib_mad_recv_wc *mad_recv_wc,
610 int mad_snoop_flags)
611 {
612 struct ib_mad_snoop_private *mad_snoop_priv;
613 unsigned long flags;
614 int i;
615
616 spin_lock_irqsave(&qp_info->snoop_lock, flags);
617 for (i = 0; i < qp_info->snoop_table_size; i++) {
618 mad_snoop_priv = qp_info->snoop_table[i];
619 if (!mad_snoop_priv ||
620 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
621 continue;
622
623 atomic_inc(&mad_snoop_priv->refcount);
624 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
625 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
626 mad_recv_wc);
627 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
628 wake_up(&mad_snoop_priv->wait);
629 spin_lock_irqsave(&qp_info->snoop_lock, flags);
630 }
631 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
632 }
633
634 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
635 struct ib_wc *wc)
636 {
637 memset(wc, 0, sizeof *wc);
638 wc->wr_id = wr_id;
639 wc->status = IB_WC_SUCCESS;
640 wc->opcode = IB_WC_RECV;
641 wc->pkey_index = pkey_index;
642 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
643 wc->src_qp = IB_QP0;
644 wc->qp_num = IB_QP0;
645 wc->slid = slid;
646 wc->sl = 0;
647 wc->dlid_path_bits = 0;
648 wc->port_num = port_num;
649 }
650
651 /*
652 * Return 0 if SMP is to be sent
653 * Return 1 if SMP was consumed locally (whether or not solicited)
654 * Return < 0 if error
655 */
656 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
657 struct ib_smp *smp,
658 struct ib_send_wr *send_wr)
659 {
660 int ret;
661 unsigned long flags;
662 struct ib_mad_local_private *local;
663 struct ib_mad_private *mad_priv;
664 struct ib_mad_port_private *port_priv;
665 struct ib_mad_agent_private *recv_mad_agent = NULL;
666 struct ib_device *device = mad_agent_priv->agent.device;
667 u8 port_num = mad_agent_priv->agent.port_num;
668 struct ib_wc mad_wc;
669
670 if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
671 ret = -EINVAL;
672 printk(KERN_ERR PFX "Invalid directed route\n");
673 goto out;
674 }
675 /* Check to post send on QP or process locally */
676 ret = smi_check_local_dr_smp(smp, device, port_num);
677 if (!ret || !device->process_mad)
678 goto out;
679
680 local = kmalloc(sizeof *local, GFP_ATOMIC);
681 if (!local) {
682 ret = -ENOMEM;
683 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
684 goto out;
685 }
686 local->mad_priv = NULL;
687 local->recv_mad_agent = NULL;
688 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
689 if (!mad_priv) {
690 ret = -ENOMEM;
691 printk(KERN_ERR PFX "No memory for local response MAD\n");
692 kfree(local);
693 goto out;
694 }
695
696 build_smp_wc(send_wr->wr_id, smp->dr_slid, send_wr->wr.ud.pkey_index,
697 send_wr->wr.ud.port_num, &mad_wc);
698
699 /* No GRH for DR SMP */
700 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
701 (struct ib_mad *)smp,
702 (struct ib_mad *)&mad_priv->mad);
703 switch (ret)
704 {
705 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
706 if (response_mad(&mad_priv->mad.mad) &&
707 mad_agent_priv->agent.recv_handler) {
708 local->mad_priv = mad_priv;
709 local->recv_mad_agent = mad_agent_priv;
710 /*
711 * Reference MAD agent until receive
712 * side of local completion handled
713 */
714 atomic_inc(&mad_agent_priv->refcount);
715 } else
716 kmem_cache_free(ib_mad_cache, mad_priv);
717 break;
718 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
719 kmem_cache_free(ib_mad_cache, mad_priv);
720 break;
721 case IB_MAD_RESULT_SUCCESS:
722 /* Treat like an incoming receive MAD */
723 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
724 mad_agent_priv->agent.port_num);
725 if (port_priv) {
726 mad_priv->mad.mad.mad_hdr.tid =
727 ((struct ib_mad *)smp)->mad_hdr.tid;
728 recv_mad_agent = find_mad_agent(port_priv,
729 &mad_priv->mad.mad);
730 }
731 if (!port_priv || !recv_mad_agent) {
732 kmem_cache_free(ib_mad_cache, mad_priv);
733 kfree(local);
734 ret = 0;
735 goto out;
736 }
737 local->mad_priv = mad_priv;
738 local->recv_mad_agent = recv_mad_agent;
739 break;
740 default:
741 kmem_cache_free(ib_mad_cache, mad_priv);
742 kfree(local);
743 ret = -EINVAL;
744 goto out;
745 }
746
747 local->send_wr = *send_wr;
748 local->send_wr.sg_list = local->sg_list;
749 memcpy(local->sg_list, send_wr->sg_list,
750 sizeof *send_wr->sg_list * send_wr->num_sge);
751 local->send_wr.next = NULL;
752 local->tid = send_wr->wr.ud.mad_hdr->tid;
753 local->wr_id = send_wr->wr_id;
754 /* Reference MAD agent until send side of local completion handled */
755 atomic_inc(&mad_agent_priv->refcount);
756 /* Queue local completion to local list */
757 spin_lock_irqsave(&mad_agent_priv->lock, flags);
758 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
759 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
760 queue_work(mad_agent_priv->qp_info->port_priv->wq,
761 &mad_agent_priv->local_work);
762 ret = 1;
763 out:
764 return ret;
765 }
766
767 static int get_buf_length(int hdr_len, int data_len)
768 {
769 int seg_size, pad;
770
771 seg_size = sizeof(struct ib_mad) - hdr_len;
772 if (data_len && seg_size) {
773 pad = seg_size - data_len % seg_size;
774 if (pad == seg_size)
775 pad = 0;
776 } else
777 pad = seg_size;
778 return hdr_len + data_len + pad;
779 }
780
781 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
782 u32 remote_qpn, u16 pkey_index,
783 struct ib_ah *ah,
784 int hdr_len, int data_len,
785 unsigned int __nocast gfp_mask)
786 {
787 struct ib_mad_agent_private *mad_agent_priv;
788 struct ib_mad_send_buf *send_buf;
789 int buf_size;
790 void *buf;
791
792 mad_agent_priv = container_of(mad_agent,
793 struct ib_mad_agent_private, agent);
794 buf_size = get_buf_length(hdr_len, data_len);
795
796 buf = kmalloc(sizeof *send_buf + buf_size, gfp_mask);
797 if (!buf)
798 return ERR_PTR(-ENOMEM);
799
800 send_buf = buf + buf_size;
801 memset(send_buf, 0, sizeof *send_buf);
802 send_buf->mad = buf;
803
804 send_buf->sge.addr = dma_map_single(mad_agent->device->dma_device,
805 buf, buf_size, DMA_TO_DEVICE);
806 pci_unmap_addr_set(send_buf, mapping, send_buf->sge.addr);
807 send_buf->sge.length = buf_size;
808 send_buf->sge.lkey = mad_agent->mr->lkey;
809
810 send_buf->send_wr.wr_id = (unsigned long) send_buf;
811 send_buf->send_wr.sg_list = &send_buf->sge;
812 send_buf->send_wr.num_sge = 1;
813 send_buf->send_wr.opcode = IB_WR_SEND;
814 send_buf->send_wr.send_flags = IB_SEND_SIGNALED;
815 send_buf->send_wr.wr.ud.ah = ah;
816 send_buf->send_wr.wr.ud.mad_hdr = &send_buf->mad->mad_hdr;
817 send_buf->send_wr.wr.ud.remote_qpn = remote_qpn;
818 send_buf->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
819 send_buf->send_wr.wr.ud.pkey_index = pkey_index;
820 send_buf->mad_agent = mad_agent;
821 atomic_inc(&mad_agent_priv->refcount);
822 return send_buf;
823 }
824 EXPORT_SYMBOL(ib_create_send_mad);
825
826 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
827 {
828 struct ib_mad_agent_private *mad_agent_priv;
829
830 mad_agent_priv = container_of(send_buf->mad_agent,
831 struct ib_mad_agent_private, agent);
832
833 dma_unmap_single(send_buf->mad_agent->device->dma_device,
834 pci_unmap_addr(send_buf, mapping),
835 send_buf->sge.length, DMA_TO_DEVICE);
836 kfree(send_buf->mad);
837
838 if (atomic_dec_and_test(&mad_agent_priv->refcount))
839 wake_up(&mad_agent_priv->wait);
840 }
841 EXPORT_SYMBOL(ib_free_send_mad);
842
843 static int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
844 {
845 struct ib_mad_qp_info *qp_info;
846 struct ib_send_wr *bad_send_wr;
847 unsigned long flags;
848 int ret;
849
850 /* Set WR ID to find mad_send_wr upon completion */
851 qp_info = mad_send_wr->mad_agent_priv->qp_info;
852 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
853 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
854
855 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
856 if (qp_info->send_queue.count++ < qp_info->send_queue.max_active) {
857 list_add_tail(&mad_send_wr->mad_list.list,
858 &qp_info->send_queue.list);
859 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
860 ret = ib_post_send(mad_send_wr->mad_agent_priv->agent.qp,
861 &mad_send_wr->send_wr, &bad_send_wr);
862 if (ret) {
863 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
864 dequeue_mad(&mad_send_wr->mad_list);
865 }
866 } else {
867 list_add_tail(&mad_send_wr->mad_list.list,
868 &qp_info->overflow_list);
869 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
870 ret = 0;
871 }
872 return ret;
873 }
874
875 /*
876 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
877 * with the registered client
878 */
879 int ib_post_send_mad(struct ib_mad_agent *mad_agent,
880 struct ib_send_wr *send_wr,
881 struct ib_send_wr **bad_send_wr)
882 {
883 int ret = -EINVAL;
884 struct ib_mad_agent_private *mad_agent_priv;
885
886 /* Validate supplied parameters */
887 if (!bad_send_wr)
888 goto error1;
889
890 if (!mad_agent || !send_wr)
891 goto error2;
892
893 if (!mad_agent->send_handler)
894 goto error2;
895
896 mad_agent_priv = container_of(mad_agent,
897 struct ib_mad_agent_private,
898 agent);
899
900 /* Walk list of send WRs and post each on send list */
901 while (send_wr) {
902 unsigned long flags;
903 struct ib_send_wr *next_send_wr;
904 struct ib_mad_send_wr_private *mad_send_wr;
905 struct ib_smp *smp;
906
907 /* Validate more parameters */
908 if (send_wr->num_sge > IB_MAD_SEND_REQ_MAX_SG)
909 goto error2;
910
911 if (send_wr->wr.ud.timeout_ms && !mad_agent->recv_handler)
912 goto error2;
913
914 if (!send_wr->wr.ud.mad_hdr) {
915 printk(KERN_ERR PFX "MAD header must be supplied "
916 "in WR %p\n", send_wr);
917 goto error2;
918 }
919
920 /*
921 * Save pointer to next work request to post in case the
922 * current one completes, and the user modifies the work
923 * request associated with the completion
924 */
925 next_send_wr = (struct ib_send_wr *)send_wr->next;
926
927 smp = (struct ib_smp *)send_wr->wr.ud.mad_hdr;
928 if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
929 ret = handle_outgoing_dr_smp(mad_agent_priv, smp,
930 send_wr);
931 if (ret < 0) /* error */
932 goto error2;
933 else if (ret == 1) /* locally consumed */
934 goto next;
935 }
936
937 /* Allocate MAD send WR tracking structure */
938 mad_send_wr = kmalloc(sizeof *mad_send_wr, GFP_ATOMIC);
939 if (!mad_send_wr) {
940 printk(KERN_ERR PFX "No memory for "
941 "ib_mad_send_wr_private\n");
942 ret = -ENOMEM;
943 goto error2;
944 }
945
946 mad_send_wr->send_wr = *send_wr;
947 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
948 memcpy(mad_send_wr->sg_list, send_wr->sg_list,
949 sizeof *send_wr->sg_list * send_wr->num_sge);
950 mad_send_wr->wr_id = mad_send_wr->send_wr.wr_id;
951 mad_send_wr->send_wr.next = NULL;
952 mad_send_wr->tid = send_wr->wr.ud.mad_hdr->tid;
953 mad_send_wr->mad_agent_priv = mad_agent_priv;
954 /* Timeout will be updated after send completes */
955 mad_send_wr->timeout = msecs_to_jiffies(send_wr->wr.
956 ud.timeout_ms);
957 mad_send_wr->retry = 0;
958 /* One reference for each work request to QP + response */
959 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
960 mad_send_wr->status = IB_WC_SUCCESS;
961
962 /* Reference MAD agent until send completes */
963 atomic_inc(&mad_agent_priv->refcount);
964 spin_lock_irqsave(&mad_agent_priv->lock, flags);
965 list_add_tail(&mad_send_wr->agent_list,
966 &mad_agent_priv->send_list);
967 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
968
969 ret = ib_send_mad(mad_send_wr);
970 if (ret) {
971 /* Fail send request */
972 spin_lock_irqsave(&mad_agent_priv->lock, flags);
973 list_del(&mad_send_wr->agent_list);
974 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
975 atomic_dec(&mad_agent_priv->refcount);
976 goto error2;
977 }
978 next:
979 send_wr = next_send_wr;
980 }
981 return 0;
982
983 error2:
984 *bad_send_wr = send_wr;
985 error1:
986 return ret;
987 }
988 EXPORT_SYMBOL(ib_post_send_mad);
989
990 /*
991 * ib_free_recv_mad - Returns data buffers used to receive
992 * a MAD to the access layer
993 */
994 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
995 {
996 struct ib_mad_recv_buf *entry;
997 struct ib_mad_private_header *mad_priv_hdr;
998 struct ib_mad_private *priv;
999
1000 mad_priv_hdr = container_of(mad_recv_wc,
1001 struct ib_mad_private_header,
1002 recv_wc);
1003 priv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1004
1005 /*
1006 * Walk receive buffer list associated with this WC
1007 * No need to remove them from list of receive buffers
1008 */
1009 list_for_each_entry(entry, &mad_recv_wc->recv_buf.list, list) {
1010 /* Free previous receive buffer */
1011 kmem_cache_free(ib_mad_cache, priv);
1012 mad_priv_hdr = container_of(mad_recv_wc,
1013 struct ib_mad_private_header,
1014 recv_wc);
1015 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1016 header);
1017 }
1018
1019 /* Free last buffer */
1020 kmem_cache_free(ib_mad_cache, priv);
1021 }
1022 EXPORT_SYMBOL(ib_free_recv_mad);
1023
1024 void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc,
1025 void *buf)
1026 {
1027 printk(KERN_ERR PFX "ib_coalesce_recv_mad() not implemented yet\n");
1028 }
1029 EXPORT_SYMBOL(ib_coalesce_recv_mad);
1030
1031 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1032 u8 rmpp_version,
1033 ib_mad_send_handler send_handler,
1034 ib_mad_recv_handler recv_handler,
1035 void *context)
1036 {
1037 return ERR_PTR(-EINVAL); /* XXX: for now */
1038 }
1039 EXPORT_SYMBOL(ib_redirect_mad_qp);
1040
1041 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1042 struct ib_wc *wc)
1043 {
1044 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1045 return 0;
1046 }
1047 EXPORT_SYMBOL(ib_process_mad_wc);
1048
1049 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1050 struct ib_mad_reg_req *mad_reg_req)
1051 {
1052 int i;
1053
1054 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1055 i < IB_MGMT_MAX_METHODS;
1056 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1057 1+i)) {
1058 if ((*method)->agent[i]) {
1059 printk(KERN_ERR PFX "Method %d already in use\n", i);
1060 return -EINVAL;
1061 }
1062 }
1063 return 0;
1064 }
1065
1066 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1067 {
1068 /* Allocate management method table */
1069 *method = kmalloc(sizeof **method, GFP_ATOMIC);
1070 if (!*method) {
1071 printk(KERN_ERR PFX "No memory for "
1072 "ib_mad_mgmt_method_table\n");
1073 return -ENOMEM;
1074 }
1075 /* Clear management method table */
1076 memset(*method, 0, sizeof **method);
1077
1078 return 0;
1079 }
1080
1081 /*
1082 * Check to see if there are any methods still in use
1083 */
1084 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1085 {
1086 int i;
1087
1088 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1089 if (method->agent[i])
1090 return 1;
1091 return 0;
1092 }
1093
1094 /*
1095 * Check to see if there are any method tables for this class still in use
1096 */
1097 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1098 {
1099 int i;
1100
1101 for (i = 0; i < MAX_MGMT_CLASS; i++)
1102 if (class->method_table[i])
1103 return 1;
1104 return 0;
1105 }
1106
1107 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1108 {
1109 int i;
1110
1111 for (i = 0; i < MAX_MGMT_OUI; i++)
1112 if (vendor_class->method_table[i])
1113 return 1;
1114 return 0;
1115 }
1116
1117 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1118 char *oui)
1119 {
1120 int i;
1121
1122 for (i = 0; i < MAX_MGMT_OUI; i++)
1123 /* Is there matching OUI for this vendor class ? */
1124 if (!memcmp(vendor_class->oui[i], oui, 3))
1125 return i;
1126
1127 return -1;
1128 }
1129
1130 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1131 {
1132 int i;
1133
1134 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1135 if (vendor->vendor_class[i])
1136 return 1;
1137
1138 return 0;
1139 }
1140
1141 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1142 struct ib_mad_agent_private *agent)
1143 {
1144 int i;
1145
1146 /* Remove any methods for this mad agent */
1147 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1148 if (method->agent[i] == agent) {
1149 method->agent[i] = NULL;
1150 }
1151 }
1152 }
1153
1154 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1155 struct ib_mad_agent_private *agent_priv,
1156 u8 mgmt_class)
1157 {
1158 struct ib_mad_port_private *port_priv;
1159 struct ib_mad_mgmt_class_table **class;
1160 struct ib_mad_mgmt_method_table **method;
1161 int i, ret;
1162
1163 port_priv = agent_priv->qp_info->port_priv;
1164 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1165 if (!*class) {
1166 /* Allocate management class table for "new" class version */
1167 *class = kmalloc(sizeof **class, GFP_ATOMIC);
1168 if (!*class) {
1169 printk(KERN_ERR PFX "No memory for "
1170 "ib_mad_mgmt_class_table\n");
1171 ret = -ENOMEM;
1172 goto error1;
1173 }
1174 /* Clear management class table */
1175 memset(*class, 0, sizeof(**class));
1176 /* Allocate method table for this management class */
1177 method = &(*class)->method_table[mgmt_class];
1178 if ((ret = allocate_method_table(method)))
1179 goto error2;
1180 } else {
1181 method = &(*class)->method_table[mgmt_class];
1182 if (!*method) {
1183 /* Allocate method table for this management class */
1184 if ((ret = allocate_method_table(method)))
1185 goto error1;
1186 }
1187 }
1188
1189 /* Now, make sure methods are not already in use */
1190 if (method_in_use(method, mad_reg_req))
1191 goto error3;
1192
1193 /* Finally, add in methods being registered */
1194 for (i = find_first_bit(mad_reg_req->method_mask,
1195 IB_MGMT_MAX_METHODS);
1196 i < IB_MGMT_MAX_METHODS;
1197 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1198 1+i)) {
1199 (*method)->agent[i] = agent_priv;
1200 }
1201 return 0;
1202
1203 error3:
1204 /* Remove any methods for this mad agent */
1205 remove_methods_mad_agent(*method, agent_priv);
1206 /* Now, check to see if there are any methods in use */
1207 if (!check_method_table(*method)) {
1208 /* If not, release management method table */
1209 kfree(*method);
1210 *method = NULL;
1211 }
1212 ret = -EINVAL;
1213 goto error1;
1214 error2:
1215 kfree(*class);
1216 *class = NULL;
1217 error1:
1218 return ret;
1219 }
1220
1221 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1222 struct ib_mad_agent_private *agent_priv)
1223 {
1224 struct ib_mad_port_private *port_priv;
1225 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1226 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1227 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1228 struct ib_mad_mgmt_method_table **method;
1229 int i, ret = -ENOMEM;
1230 u8 vclass;
1231
1232 /* "New" vendor (with OUI) class */
1233 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1234 port_priv = agent_priv->qp_info->port_priv;
1235 vendor_table = &port_priv->version[
1236 mad_reg_req->mgmt_class_version].vendor;
1237 if (!*vendor_table) {
1238 /* Allocate mgmt vendor class table for "new" class version */
1239 vendor = kmalloc(sizeof *vendor, GFP_ATOMIC);
1240 if (!vendor) {
1241 printk(KERN_ERR PFX "No memory for "
1242 "ib_mad_mgmt_vendor_class_table\n");
1243 goto error1;
1244 }
1245 /* Clear management vendor class table */
1246 memset(vendor, 0, sizeof(*vendor));
1247 *vendor_table = vendor;
1248 }
1249 if (!(*vendor_table)->vendor_class[vclass]) {
1250 /* Allocate table for this management vendor class */
1251 vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC);
1252 if (!vendor_class) {
1253 printk(KERN_ERR PFX "No memory for "
1254 "ib_mad_mgmt_vendor_class\n");
1255 goto error2;
1256 }
1257 memset(vendor_class, 0, sizeof(*vendor_class));
1258 (*vendor_table)->vendor_class[vclass] = vendor_class;
1259 }
1260 for (i = 0; i < MAX_MGMT_OUI; i++) {
1261 /* Is there matching OUI for this vendor class ? */
1262 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1263 mad_reg_req->oui, 3)) {
1264 method = &(*vendor_table)->vendor_class[
1265 vclass]->method_table[i];
1266 BUG_ON(!*method);
1267 goto check_in_use;
1268 }
1269 }
1270 for (i = 0; i < MAX_MGMT_OUI; i++) {
1271 /* OUI slot available ? */
1272 if (!is_vendor_oui((*vendor_table)->vendor_class[
1273 vclass]->oui[i])) {
1274 method = &(*vendor_table)->vendor_class[
1275 vclass]->method_table[i];
1276 BUG_ON(*method);
1277 /* Allocate method table for this OUI */
1278 if ((ret = allocate_method_table(method)))
1279 goto error3;
1280 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1281 mad_reg_req->oui, 3);
1282 goto check_in_use;
1283 }
1284 }
1285 printk(KERN_ERR PFX "All OUI slots in use\n");
1286 goto error3;
1287
1288 check_in_use:
1289 /* Now, make sure methods are not already in use */
1290 if (method_in_use(method, mad_reg_req))
1291 goto error4;
1292
1293 /* Finally, add in methods being registered */
1294 for (i = find_first_bit(mad_reg_req->method_mask,
1295 IB_MGMT_MAX_METHODS);
1296 i < IB_MGMT_MAX_METHODS;
1297 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1298 1+i)) {
1299 (*method)->agent[i] = agent_priv;
1300 }
1301 return 0;
1302
1303 error4:
1304 /* Remove any methods for this mad agent */
1305 remove_methods_mad_agent(*method, agent_priv);
1306 /* Now, check to see if there are any methods in use */
1307 if (!check_method_table(*method)) {
1308 /* If not, release management method table */
1309 kfree(*method);
1310 *method = NULL;
1311 }
1312 ret = -EINVAL;
1313 error3:
1314 if (vendor_class) {
1315 (*vendor_table)->vendor_class[vclass] = NULL;
1316 kfree(vendor_class);
1317 }
1318 error2:
1319 if (vendor) {
1320 *vendor_table = NULL;
1321 kfree(vendor);
1322 }
1323 error1:
1324 return ret;
1325 }
1326
1327 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1328 {
1329 struct ib_mad_port_private *port_priv;
1330 struct ib_mad_mgmt_class_table *class;
1331 struct ib_mad_mgmt_method_table *method;
1332 struct ib_mad_mgmt_vendor_class_table *vendor;
1333 struct ib_mad_mgmt_vendor_class *vendor_class;
1334 int index;
1335 u8 mgmt_class;
1336
1337 /*
1338 * Was MAD registration request supplied
1339 * with original registration ?
1340 */
1341 if (!agent_priv->reg_req) {
1342 goto out;
1343 }
1344
1345 port_priv = agent_priv->qp_info->port_priv;
1346 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1347 class = port_priv->version[
1348 agent_priv->reg_req->mgmt_class_version].class;
1349 if (!class)
1350 goto vendor_check;
1351
1352 method = class->method_table[mgmt_class];
1353 if (method) {
1354 /* Remove any methods for this mad agent */
1355 remove_methods_mad_agent(method, agent_priv);
1356 /* Now, check to see if there are any methods still in use */
1357 if (!check_method_table(method)) {
1358 /* If not, release management method table */
1359 kfree(method);
1360 class->method_table[mgmt_class] = NULL;
1361 /* Any management classes left ? */
1362 if (!check_class_table(class)) {
1363 /* If not, release management class table */
1364 kfree(class);
1365 port_priv->version[
1366 agent_priv->reg_req->
1367 mgmt_class_version].class = NULL;
1368 }
1369 }
1370 }
1371
1372 vendor_check:
1373 if (!is_vendor_class(mgmt_class))
1374 goto out;
1375
1376 /* normalize mgmt_class to vendor range 2 */
1377 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1378 vendor = port_priv->version[
1379 agent_priv->reg_req->mgmt_class_version].vendor;
1380
1381 if (!vendor)
1382 goto out;
1383
1384 vendor_class = vendor->vendor_class[mgmt_class];
1385 if (vendor_class) {
1386 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1387 if (index < 0)
1388 goto out;
1389 method = vendor_class->method_table[index];
1390 if (method) {
1391 /* Remove any methods for this mad agent */
1392 remove_methods_mad_agent(method, agent_priv);
1393 /*
1394 * Now, check to see if there are
1395 * any methods still in use
1396 */
1397 if (!check_method_table(method)) {
1398 /* If not, release management method table */
1399 kfree(method);
1400 vendor_class->method_table[index] = NULL;
1401 memset(vendor_class->oui[index], 0, 3);
1402 /* Any OUIs left ? */
1403 if (!check_vendor_class(vendor_class)) {
1404 /* If not, release vendor class table */
1405 kfree(vendor_class);
1406 vendor->vendor_class[mgmt_class] = NULL;
1407 /* Any other vendor classes left ? */
1408 if (!check_vendor_table(vendor)) {
1409 kfree(vendor);
1410 port_priv->version[
1411 agent_priv->reg_req->
1412 mgmt_class_version].
1413 vendor = NULL;
1414 }
1415 }
1416 }
1417 }
1418 }
1419
1420 out:
1421 return;
1422 }
1423
1424 static struct ib_mad_agent_private *
1425 find_mad_agent(struct ib_mad_port_private *port_priv,
1426 struct ib_mad *mad)
1427 {
1428 struct ib_mad_agent_private *mad_agent = NULL;
1429 unsigned long flags;
1430
1431 spin_lock_irqsave(&port_priv->reg_lock, flags);
1432 if (response_mad(mad)) {
1433 u32 hi_tid;
1434 struct ib_mad_agent_private *entry;
1435
1436 /*
1437 * Routing is based on high 32 bits of transaction ID
1438 * of MAD.
1439 */
1440 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1441 list_for_each_entry(entry, &port_priv->agent_list,
1442 agent_list) {
1443 if (entry->agent.hi_tid == hi_tid) {
1444 mad_agent = entry;
1445 break;
1446 }
1447 }
1448 } else {
1449 struct ib_mad_mgmt_class_table *class;
1450 struct ib_mad_mgmt_method_table *method;
1451 struct ib_mad_mgmt_vendor_class_table *vendor;
1452 struct ib_mad_mgmt_vendor_class *vendor_class;
1453 struct ib_vendor_mad *vendor_mad;
1454 int index;
1455
1456 /*
1457 * Routing is based on version, class, and method
1458 * For "newer" vendor MADs, also based on OUI
1459 */
1460 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1461 goto out;
1462 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1463 class = port_priv->version[
1464 mad->mad_hdr.class_version].class;
1465 if (!class)
1466 goto out;
1467 method = class->method_table[convert_mgmt_class(
1468 mad->mad_hdr.mgmt_class)];
1469 if (method)
1470 mad_agent = method->agent[mad->mad_hdr.method &
1471 ~IB_MGMT_METHOD_RESP];
1472 } else {
1473 vendor = port_priv->version[
1474 mad->mad_hdr.class_version].vendor;
1475 if (!vendor)
1476 goto out;
1477 vendor_class = vendor->vendor_class[vendor_class_index(
1478 mad->mad_hdr.mgmt_class)];
1479 if (!vendor_class)
1480 goto out;
1481 /* Find matching OUI */
1482 vendor_mad = (struct ib_vendor_mad *)mad;
1483 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1484 if (index == -1)
1485 goto out;
1486 method = vendor_class->method_table[index];
1487 if (method) {
1488 mad_agent = method->agent[mad->mad_hdr.method &
1489 ~IB_MGMT_METHOD_RESP];
1490 }
1491 }
1492 }
1493
1494 if (mad_agent) {
1495 if (mad_agent->agent.recv_handler)
1496 atomic_inc(&mad_agent->refcount);
1497 else {
1498 printk(KERN_NOTICE PFX "No receive handler for client "
1499 "%p on port %d\n",
1500 &mad_agent->agent, port_priv->port_num);
1501 mad_agent = NULL;
1502 }
1503 }
1504 out:
1505 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1506
1507 return mad_agent;
1508 }
1509
1510 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1511 {
1512 int valid = 0;
1513
1514 /* Make sure MAD base version is understood */
1515 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1516 printk(KERN_ERR PFX "MAD received with unsupported base "
1517 "version %d\n", mad->mad_hdr.base_version);
1518 goto out;
1519 }
1520
1521 /* Filter SMI packets sent to other than QP0 */
1522 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1523 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1524 if (qp_num == 0)
1525 valid = 1;
1526 } else {
1527 /* Filter GSI packets sent to QP0 */
1528 if (qp_num != 0)
1529 valid = 1;
1530 }
1531
1532 out:
1533 return valid;
1534 }
1535
1536 static struct ib_mad_send_wr_private*
1537 find_send_req(struct ib_mad_agent_private *mad_agent_priv,
1538 u64 tid)
1539 {
1540 struct ib_mad_send_wr_private *mad_send_wr;
1541
1542 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1543 agent_list) {
1544 if (mad_send_wr->tid == tid)
1545 return mad_send_wr;
1546 }
1547
1548 /*
1549 * It's possible to receive the response before we've
1550 * been notified that the send has completed
1551 */
1552 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1553 agent_list) {
1554 if (mad_send_wr->tid == tid && mad_send_wr->timeout) {
1555 /* Verify request has not been canceled */
1556 return (mad_send_wr->status == IB_WC_SUCCESS) ?
1557 mad_send_wr : NULL;
1558 }
1559 }
1560 return NULL;
1561 }
1562
1563 static void ib_mark_req_done(struct ib_mad_send_wr_private *mad_send_wr)
1564 {
1565 mad_send_wr->timeout = 0;
1566 if (mad_send_wr->refcount == 1) {
1567 list_del(&mad_send_wr->agent_list);
1568 list_add_tail(&mad_send_wr->agent_list,
1569 &mad_send_wr->mad_agent_priv->done_list);
1570 }
1571 }
1572
1573 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1574 struct ib_mad_recv_wc *mad_recv_wc)
1575 {
1576 struct ib_mad_send_wr_private *mad_send_wr;
1577 struct ib_mad_send_wc mad_send_wc;
1578 unsigned long flags;
1579 u64 tid;
1580
1581 INIT_LIST_HEAD(&mad_recv_wc->recv_buf.list);
1582 /* Complete corresponding request */
1583 if (response_mad(mad_recv_wc->recv_buf.mad)) {
1584 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1585 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1586 mad_send_wr = find_send_req(mad_agent_priv, tid);
1587 if (!mad_send_wr) {
1588 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1589 ib_free_recv_mad(mad_recv_wc);
1590 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1591 wake_up(&mad_agent_priv->wait);
1592 return;
1593 }
1594 ib_mark_req_done(mad_send_wr);
1595 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1596
1597 /* Defined behavior is to complete response before request */
1598 mad_recv_wc->wc->wr_id = mad_send_wr->wr_id;
1599 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1600 mad_recv_wc);
1601 atomic_dec(&mad_agent_priv->refcount);
1602
1603 mad_send_wc.status = IB_WC_SUCCESS;
1604 mad_send_wc.vendor_err = 0;
1605 mad_send_wc.wr_id = mad_send_wr->wr_id;
1606 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1607 } else {
1608 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1609 mad_recv_wc);
1610 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1611 wake_up(&mad_agent_priv->wait);
1612 }
1613 }
1614
1615 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1616 struct ib_wc *wc)
1617 {
1618 struct ib_mad_qp_info *qp_info;
1619 struct ib_mad_private_header *mad_priv_hdr;
1620 struct ib_mad_private *recv, *response;
1621 struct ib_mad_list_head *mad_list;
1622 struct ib_mad_agent_private *mad_agent;
1623
1624 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1625 if (!response)
1626 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1627 "for response buffer\n");
1628
1629 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1630 qp_info = mad_list->mad_queue->qp_info;
1631 dequeue_mad(mad_list);
1632
1633 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1634 mad_list);
1635 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1636 dma_unmap_single(port_priv->device->dma_device,
1637 pci_unmap_addr(&recv->header, mapping),
1638 sizeof(struct ib_mad_private) -
1639 sizeof(struct ib_mad_private_header),
1640 DMA_FROM_DEVICE);
1641
1642 /* Setup MAD receive work completion from "normal" work completion */
1643 recv->header.wc = *wc;
1644 recv->header.recv_wc.wc = &recv->header.wc;
1645 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1646 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1647 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1648
1649 if (atomic_read(&qp_info->snoop_count))
1650 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1651
1652 /* Validate MAD */
1653 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1654 goto out;
1655
1656 if (recv->mad.mad.mad_hdr.mgmt_class ==
1657 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1658 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1659 port_priv->device->node_type,
1660 port_priv->port_num,
1661 port_priv->device->phys_port_cnt))
1662 goto out;
1663 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1664 goto local;
1665 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1666 port_priv->device->node_type,
1667 port_priv->port_num))
1668 goto out;
1669 if (!smi_check_local_dr_smp(&recv->mad.smp,
1670 port_priv->device,
1671 port_priv->port_num))
1672 goto out;
1673 }
1674
1675 local:
1676 /* Give driver "right of first refusal" on incoming MAD */
1677 if (port_priv->device->process_mad) {
1678 int ret;
1679
1680 if (!response) {
1681 printk(KERN_ERR PFX "No memory for response MAD\n");
1682 /*
1683 * Is it better to assume that
1684 * it wouldn't be processed ?
1685 */
1686 goto out;
1687 }
1688
1689 ret = port_priv->device->process_mad(port_priv->device, 0,
1690 port_priv->port_num,
1691 wc, &recv->grh,
1692 &recv->mad.mad,
1693 &response->mad.mad);
1694 if (ret & IB_MAD_RESULT_SUCCESS) {
1695 if (ret & IB_MAD_RESULT_CONSUMED)
1696 goto out;
1697 if (ret & IB_MAD_RESULT_REPLY) {
1698 /* Send response */
1699 if (!agent_send(response, &recv->grh, wc,
1700 port_priv->device,
1701 port_priv->port_num))
1702 response = NULL;
1703 goto out;
1704 }
1705 }
1706 }
1707
1708 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1709 if (mad_agent) {
1710 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1711 /*
1712 * recv is freed up in error cases in ib_mad_complete_recv
1713 * or via recv_handler in ib_mad_complete_recv()
1714 */
1715 recv = NULL;
1716 }
1717
1718 out:
1719 /* Post another receive request for this QP */
1720 if (response) {
1721 ib_mad_post_receive_mads(qp_info, response);
1722 if (recv)
1723 kmem_cache_free(ib_mad_cache, recv);
1724 } else
1725 ib_mad_post_receive_mads(qp_info, recv);
1726 }
1727
1728 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1729 {
1730 struct ib_mad_send_wr_private *mad_send_wr;
1731 unsigned long delay;
1732
1733 if (list_empty(&mad_agent_priv->wait_list)) {
1734 cancel_delayed_work(&mad_agent_priv->timed_work);
1735 } else {
1736 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1737 struct ib_mad_send_wr_private,
1738 agent_list);
1739
1740 if (time_after(mad_agent_priv->timeout,
1741 mad_send_wr->timeout)) {
1742 mad_agent_priv->timeout = mad_send_wr->timeout;
1743 cancel_delayed_work(&mad_agent_priv->timed_work);
1744 delay = mad_send_wr->timeout - jiffies;
1745 if ((long)delay <= 0)
1746 delay = 1;
1747 queue_delayed_work(mad_agent_priv->qp_info->
1748 port_priv->wq,
1749 &mad_agent_priv->timed_work, delay);
1750 }
1751 }
1752 }
1753
1754 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1755 {
1756 struct ib_mad_agent_private *mad_agent_priv;
1757 struct ib_mad_send_wr_private *temp_mad_send_wr;
1758 struct list_head *list_item;
1759 unsigned long delay;
1760
1761 mad_agent_priv = mad_send_wr->mad_agent_priv;
1762 list_del(&mad_send_wr->agent_list);
1763
1764 delay = mad_send_wr->timeout;
1765 mad_send_wr->timeout += jiffies;
1766
1767 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1768 temp_mad_send_wr = list_entry(list_item,
1769 struct ib_mad_send_wr_private,
1770 agent_list);
1771 if (time_after(mad_send_wr->timeout,
1772 temp_mad_send_wr->timeout))
1773 break;
1774 }
1775 list_add(&mad_send_wr->agent_list, list_item);
1776
1777 /* Reschedule a work item if we have a shorter timeout */
1778 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1779 cancel_delayed_work(&mad_agent_priv->timed_work);
1780 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1781 &mad_agent_priv->timed_work, delay);
1782 }
1783 }
1784
1785 /*
1786 * Process a send work completion
1787 */
1788 static void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1789 struct ib_mad_send_wc *mad_send_wc)
1790 {
1791 struct ib_mad_agent_private *mad_agent_priv;
1792 unsigned long flags;
1793
1794 mad_agent_priv = mad_send_wr->mad_agent_priv;
1795 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1796 if (mad_send_wc->status != IB_WC_SUCCESS &&
1797 mad_send_wr->status == IB_WC_SUCCESS) {
1798 mad_send_wr->status = mad_send_wc->status;
1799 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1800 }
1801
1802 if (--mad_send_wr->refcount > 0) {
1803 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1804 mad_send_wr->status == IB_WC_SUCCESS) {
1805 wait_for_response(mad_send_wr);
1806 }
1807 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1808 return;
1809 }
1810
1811 /* Remove send from MAD agent and notify client of completion */
1812 list_del(&mad_send_wr->agent_list);
1813 adjust_timeout(mad_agent_priv);
1814 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1815
1816 if (mad_send_wr->status != IB_WC_SUCCESS )
1817 mad_send_wc->status = mad_send_wr->status;
1818 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1819 mad_send_wc);
1820
1821 /* Release reference on agent taken when sending */
1822 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1823 wake_up(&mad_agent_priv->wait);
1824
1825 kfree(mad_send_wr);
1826 }
1827
1828 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1829 struct ib_wc *wc)
1830 {
1831 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
1832 struct ib_mad_list_head *mad_list;
1833 struct ib_mad_qp_info *qp_info;
1834 struct ib_mad_queue *send_queue;
1835 struct ib_send_wr *bad_send_wr;
1836 unsigned long flags;
1837 int ret;
1838
1839 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1840 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1841 mad_list);
1842 send_queue = mad_list->mad_queue;
1843 qp_info = send_queue->qp_info;
1844
1845 retry:
1846 queued_send_wr = NULL;
1847 spin_lock_irqsave(&send_queue->lock, flags);
1848 list_del(&mad_list->list);
1849
1850 /* Move queued send to the send queue */
1851 if (send_queue->count-- > send_queue->max_active) {
1852 mad_list = container_of(qp_info->overflow_list.next,
1853 struct ib_mad_list_head, list);
1854 queued_send_wr = container_of(mad_list,
1855 struct ib_mad_send_wr_private,
1856 mad_list);
1857 list_del(&mad_list->list);
1858 list_add_tail(&mad_list->list, &send_queue->list);
1859 }
1860 spin_unlock_irqrestore(&send_queue->lock, flags);
1861
1862 /* Restore client wr_id in WC and complete send */
1863 wc->wr_id = mad_send_wr->wr_id;
1864 if (atomic_read(&qp_info->snoop_count))
1865 snoop_send(qp_info, &mad_send_wr->send_wr,
1866 (struct ib_mad_send_wc *)wc,
1867 IB_MAD_SNOOP_SEND_COMPLETIONS);
1868 ib_mad_complete_send_wr(mad_send_wr, (struct ib_mad_send_wc *)wc);
1869
1870 if (queued_send_wr) {
1871 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1872 &bad_send_wr);
1873 if (ret) {
1874 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1875 mad_send_wr = queued_send_wr;
1876 wc->status = IB_WC_LOC_QP_OP_ERR;
1877 goto retry;
1878 }
1879 }
1880 }
1881
1882 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1883 {
1884 struct ib_mad_send_wr_private *mad_send_wr;
1885 struct ib_mad_list_head *mad_list;
1886 unsigned long flags;
1887
1888 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1889 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1890 mad_send_wr = container_of(mad_list,
1891 struct ib_mad_send_wr_private,
1892 mad_list);
1893 mad_send_wr->retry = 1;
1894 }
1895 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1896 }
1897
1898 static void mad_error_handler(struct ib_mad_port_private *port_priv,
1899 struct ib_wc *wc)
1900 {
1901 struct ib_mad_list_head *mad_list;
1902 struct ib_mad_qp_info *qp_info;
1903 struct ib_mad_send_wr_private *mad_send_wr;
1904 int ret;
1905
1906 /* Determine if failure was a send or receive */
1907 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1908 qp_info = mad_list->mad_queue->qp_info;
1909 if (mad_list->mad_queue == &qp_info->recv_queue)
1910 /*
1911 * Receive errors indicate that the QP has entered the error
1912 * state - error handling/shutdown code will cleanup
1913 */
1914 return;
1915
1916 /*
1917 * Send errors will transition the QP to SQE - move
1918 * QP to RTS and repost flushed work requests
1919 */
1920 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1921 mad_list);
1922 if (wc->status == IB_WC_WR_FLUSH_ERR) {
1923 if (mad_send_wr->retry) {
1924 /* Repost send */
1925 struct ib_send_wr *bad_send_wr;
1926
1927 mad_send_wr->retry = 0;
1928 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1929 &bad_send_wr);
1930 if (ret)
1931 ib_mad_send_done_handler(port_priv, wc);
1932 } else
1933 ib_mad_send_done_handler(port_priv, wc);
1934 } else {
1935 struct ib_qp_attr *attr;
1936
1937 /* Transition QP to RTS and fail offending send */
1938 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1939 if (attr) {
1940 attr->qp_state = IB_QPS_RTS;
1941 attr->cur_qp_state = IB_QPS_SQE;
1942 ret = ib_modify_qp(qp_info->qp, attr,
1943 IB_QP_STATE | IB_QP_CUR_STATE);
1944 kfree(attr);
1945 if (ret)
1946 printk(KERN_ERR PFX "mad_error_handler - "
1947 "ib_modify_qp to RTS : %d\n", ret);
1948 else
1949 mark_sends_for_retry(qp_info);
1950 }
1951 ib_mad_send_done_handler(port_priv, wc);
1952 }
1953 }
1954
1955 /*
1956 * IB MAD completion callback
1957 */
1958 static void ib_mad_completion_handler(void *data)
1959 {
1960 struct ib_mad_port_private *port_priv;
1961 struct ib_wc wc;
1962
1963 port_priv = (struct ib_mad_port_private *)data;
1964 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
1965
1966 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
1967 if (wc.status == IB_WC_SUCCESS) {
1968 switch (wc.opcode) {
1969 case IB_WC_SEND:
1970 ib_mad_send_done_handler(port_priv, &wc);
1971 break;
1972 case IB_WC_RECV:
1973 ib_mad_recv_done_handler(port_priv, &wc);
1974 break;
1975 default:
1976 BUG_ON(1);
1977 break;
1978 }
1979 } else
1980 mad_error_handler(port_priv, &wc);
1981 }
1982 }
1983
1984 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
1985 {
1986 unsigned long flags;
1987 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
1988 struct ib_mad_send_wc mad_send_wc;
1989 struct list_head cancel_list;
1990
1991 INIT_LIST_HEAD(&cancel_list);
1992
1993 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1994 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
1995 &mad_agent_priv->send_list, agent_list) {
1996 if (mad_send_wr->status == IB_WC_SUCCESS) {
1997 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
1998 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1999 }
2000 }
2001
2002 /* Empty wait list to prevent receives from finding a request */
2003 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2004 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2005
2006 /* Report all cancelled requests */
2007 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2008 mad_send_wc.vendor_err = 0;
2009
2010 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2011 &cancel_list, agent_list) {
2012 mad_send_wc.wr_id = mad_send_wr->wr_id;
2013 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2014 &mad_send_wc);
2015
2016 list_del(&mad_send_wr->agent_list);
2017 kfree(mad_send_wr);
2018 atomic_dec(&mad_agent_priv->refcount);
2019 }
2020 }
2021
2022 static struct ib_mad_send_wr_private*
2023 find_send_by_wr_id(struct ib_mad_agent_private *mad_agent_priv,
2024 u64 wr_id)
2025 {
2026 struct ib_mad_send_wr_private *mad_send_wr;
2027
2028 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2029 agent_list) {
2030 if (mad_send_wr->wr_id == wr_id)
2031 return mad_send_wr;
2032 }
2033
2034 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2035 agent_list) {
2036 if (mad_send_wr->wr_id == wr_id)
2037 return mad_send_wr;
2038 }
2039 return NULL;
2040 }
2041
2042 void cancel_sends(void *data)
2043 {
2044 struct ib_mad_agent_private *mad_agent_priv;
2045 struct ib_mad_send_wr_private *mad_send_wr;
2046 struct ib_mad_send_wc mad_send_wc;
2047 unsigned long flags;
2048
2049 mad_agent_priv = data;
2050
2051 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2052 mad_send_wc.vendor_err = 0;
2053
2054 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2055 while (!list_empty(&mad_agent_priv->canceled_list)) {
2056 mad_send_wr = list_entry(mad_agent_priv->canceled_list.next,
2057 struct ib_mad_send_wr_private,
2058 agent_list);
2059
2060 list_del(&mad_send_wr->agent_list);
2061 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2062
2063 mad_send_wc.wr_id = mad_send_wr->wr_id;
2064 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2065 &mad_send_wc);
2066
2067 kfree(mad_send_wr);
2068 if (atomic_dec_and_test(&mad_agent_priv->refcount))
2069 wake_up(&mad_agent_priv->wait);
2070 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2071 }
2072 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2073 }
2074
2075 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2076 u64 wr_id)
2077 {
2078 struct ib_mad_agent_private *mad_agent_priv;
2079 struct ib_mad_send_wr_private *mad_send_wr;
2080 unsigned long flags;
2081
2082 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2083 agent);
2084 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2085 mad_send_wr = find_send_by_wr_id(mad_agent_priv, wr_id);
2086 if (!mad_send_wr) {
2087 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2088 goto out;
2089 }
2090
2091 if (mad_send_wr->status == IB_WC_SUCCESS)
2092 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2093
2094 if (mad_send_wr->refcount != 0) {
2095 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2096 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2097 goto out;
2098 }
2099
2100 list_del(&mad_send_wr->agent_list);
2101 list_add_tail(&mad_send_wr->agent_list, &mad_agent_priv->canceled_list);
2102 adjust_timeout(mad_agent_priv);
2103 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2104
2105 queue_work(mad_agent_priv->qp_info->port_priv->wq,
2106 &mad_agent_priv->canceled_work);
2107 out:
2108 return;
2109 }
2110 EXPORT_SYMBOL(ib_cancel_mad);
2111
2112 static void local_completions(void *data)
2113 {
2114 struct ib_mad_agent_private *mad_agent_priv;
2115 struct ib_mad_local_private *local;
2116 struct ib_mad_agent_private *recv_mad_agent;
2117 unsigned long flags;
2118 struct ib_wc wc;
2119 struct ib_mad_send_wc mad_send_wc;
2120
2121 mad_agent_priv = (struct ib_mad_agent_private *)data;
2122
2123 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2124 while (!list_empty(&mad_agent_priv->local_list)) {
2125 local = list_entry(mad_agent_priv->local_list.next,
2126 struct ib_mad_local_private,
2127 completion_list);
2128 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2129 if (local->mad_priv) {
2130 recv_mad_agent = local->recv_mad_agent;
2131 if (!recv_mad_agent) {
2132 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2133 kmem_cache_free(ib_mad_cache, local->mad_priv);
2134 goto local_send_completion;
2135 }
2136
2137 /*
2138 * Defined behavior is to complete response
2139 * before request
2140 */
2141 build_smp_wc(local->wr_id, IB_LID_PERMISSIVE,
2142 0 /* pkey index */,
2143 recv_mad_agent->agent.port_num, &wc);
2144
2145 local->mad_priv->header.recv_wc.wc = &wc;
2146 local->mad_priv->header.recv_wc.mad_len =
2147 sizeof(struct ib_mad);
2148 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.recv_buf.list);
2149 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2150 local->mad_priv->header.recv_wc.recv_buf.mad =
2151 &local->mad_priv->mad.mad;
2152 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2153 snoop_recv(recv_mad_agent->qp_info,
2154 &local->mad_priv->header.recv_wc,
2155 IB_MAD_SNOOP_RECVS);
2156 recv_mad_agent->agent.recv_handler(
2157 &recv_mad_agent->agent,
2158 &local->mad_priv->header.recv_wc);
2159 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2160 atomic_dec(&recv_mad_agent->refcount);
2161 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2162 }
2163
2164 local_send_completion:
2165 /* Complete send */
2166 mad_send_wc.status = IB_WC_SUCCESS;
2167 mad_send_wc.vendor_err = 0;
2168 mad_send_wc.wr_id = local->wr_id;
2169 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2170 snoop_send(mad_agent_priv->qp_info, &local->send_wr,
2171 &mad_send_wc,
2172 IB_MAD_SNOOP_SEND_COMPLETIONS);
2173 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2174 &mad_send_wc);
2175
2176 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2177 list_del(&local->completion_list);
2178 atomic_dec(&mad_agent_priv->refcount);
2179 kfree(local);
2180 }
2181 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2182 }
2183
2184 static void timeout_sends(void *data)
2185 {
2186 struct ib_mad_agent_private *mad_agent_priv;
2187 struct ib_mad_send_wr_private *mad_send_wr;
2188 struct ib_mad_send_wc mad_send_wc;
2189 unsigned long flags, delay;
2190
2191 mad_agent_priv = (struct ib_mad_agent_private *)data;
2192
2193 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2194 mad_send_wc.vendor_err = 0;
2195
2196 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2197 while (!list_empty(&mad_agent_priv->wait_list)) {
2198 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2199 struct ib_mad_send_wr_private,
2200 agent_list);
2201
2202 if (time_after(mad_send_wr->timeout, jiffies)) {
2203 delay = mad_send_wr->timeout - jiffies;
2204 if ((long)delay <= 0)
2205 delay = 1;
2206 queue_delayed_work(mad_agent_priv->qp_info->
2207 port_priv->wq,
2208 &mad_agent_priv->timed_work, delay);
2209 break;
2210 }
2211
2212 list_del(&mad_send_wr->agent_list);
2213 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2214
2215 mad_send_wc.wr_id = mad_send_wr->wr_id;
2216 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2217 &mad_send_wc);
2218
2219 kfree(mad_send_wr);
2220 atomic_dec(&mad_agent_priv->refcount);
2221 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2222 }
2223 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2224 }
2225
2226 static void ib_mad_thread_completion_handler(struct ib_cq *cq)
2227 {
2228 struct ib_mad_port_private *port_priv = cq->cq_context;
2229
2230 queue_work(port_priv->wq, &port_priv->work);
2231 }
2232
2233 /*
2234 * Allocate receive MADs and post receive WRs for them
2235 */
2236 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2237 struct ib_mad_private *mad)
2238 {
2239 unsigned long flags;
2240 int post, ret;
2241 struct ib_mad_private *mad_priv;
2242 struct ib_sge sg_list;
2243 struct ib_recv_wr recv_wr, *bad_recv_wr;
2244 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2245
2246 /* Initialize common scatter list fields */
2247 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2248 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2249
2250 /* Initialize common receive WR fields */
2251 recv_wr.next = NULL;
2252 recv_wr.sg_list = &sg_list;
2253 recv_wr.num_sge = 1;
2254
2255 do {
2256 /* Allocate and map receive buffer */
2257 if (mad) {
2258 mad_priv = mad;
2259 mad = NULL;
2260 } else {
2261 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2262 if (!mad_priv) {
2263 printk(KERN_ERR PFX "No memory for receive buffer\n");
2264 ret = -ENOMEM;
2265 break;
2266 }
2267 }
2268 sg_list.addr = dma_map_single(qp_info->port_priv->
2269 device->dma_device,
2270 &mad_priv->grh,
2271 sizeof *mad_priv -
2272 sizeof mad_priv->header,
2273 DMA_FROM_DEVICE);
2274 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2275 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2276 mad_priv->header.mad_list.mad_queue = recv_queue;
2277
2278 /* Post receive WR */
2279 spin_lock_irqsave(&recv_queue->lock, flags);
2280 post = (++recv_queue->count < recv_queue->max_active);
2281 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2282 spin_unlock_irqrestore(&recv_queue->lock, flags);
2283 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2284 if (ret) {
2285 spin_lock_irqsave(&recv_queue->lock, flags);
2286 list_del(&mad_priv->header.mad_list.list);
2287 recv_queue->count--;
2288 spin_unlock_irqrestore(&recv_queue->lock, flags);
2289 dma_unmap_single(qp_info->port_priv->device->dma_device,
2290 pci_unmap_addr(&mad_priv->header,
2291 mapping),
2292 sizeof *mad_priv -
2293 sizeof mad_priv->header,
2294 DMA_FROM_DEVICE);
2295 kmem_cache_free(ib_mad_cache, mad_priv);
2296 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2297 break;
2298 }
2299 } while (post);
2300
2301 return ret;
2302 }
2303
2304 /*
2305 * Return all the posted receive MADs
2306 */
2307 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2308 {
2309 struct ib_mad_private_header *mad_priv_hdr;
2310 struct ib_mad_private *recv;
2311 struct ib_mad_list_head *mad_list;
2312
2313 while (!list_empty(&qp_info->recv_queue.list)) {
2314
2315 mad_list = list_entry(qp_info->recv_queue.list.next,
2316 struct ib_mad_list_head, list);
2317 mad_priv_hdr = container_of(mad_list,
2318 struct ib_mad_private_header,
2319 mad_list);
2320 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2321 header);
2322
2323 /* Remove from posted receive MAD list */
2324 list_del(&mad_list->list);
2325
2326 dma_unmap_single(qp_info->port_priv->device->dma_device,
2327 pci_unmap_addr(&recv->header, mapping),
2328 sizeof(struct ib_mad_private) -
2329 sizeof(struct ib_mad_private_header),
2330 DMA_FROM_DEVICE);
2331 kmem_cache_free(ib_mad_cache, recv);
2332 }
2333
2334 qp_info->recv_queue.count = 0;
2335 }
2336
2337 /*
2338 * Start the port
2339 */
2340 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2341 {
2342 int ret, i;
2343 struct ib_qp_attr *attr;
2344 struct ib_qp *qp;
2345
2346 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2347 if (!attr) {
2348 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2349 return -ENOMEM;
2350 }
2351
2352 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2353 qp = port_priv->qp_info[i].qp;
2354 /*
2355 * PKey index for QP1 is irrelevant but
2356 * one is needed for the Reset to Init transition
2357 */
2358 attr->qp_state = IB_QPS_INIT;
2359 attr->pkey_index = 0;
2360 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2361 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2362 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2363 if (ret) {
2364 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2365 "INIT: %d\n", i, ret);
2366 goto out;
2367 }
2368
2369 attr->qp_state = IB_QPS_RTR;
2370 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2371 if (ret) {
2372 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2373 "RTR: %d\n", i, ret);
2374 goto out;
2375 }
2376
2377 attr->qp_state = IB_QPS_RTS;
2378 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2379 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2380 if (ret) {
2381 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2382 "RTS: %d\n", i, ret);
2383 goto out;
2384 }
2385 }
2386
2387 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2388 if (ret) {
2389 printk(KERN_ERR PFX "Failed to request completion "
2390 "notification: %d\n", ret);
2391 goto out;
2392 }
2393
2394 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2395 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2396 if (ret) {
2397 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2398 goto out;
2399 }
2400 }
2401 out:
2402 kfree(attr);
2403 return ret;
2404 }
2405
2406 static void qp_event_handler(struct ib_event *event, void *qp_context)
2407 {
2408 struct ib_mad_qp_info *qp_info = qp_context;
2409
2410 /* It's worse than that! He's dead, Jim! */
2411 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2412 event->event, qp_info->qp->qp_num);
2413 }
2414
2415 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2416 struct ib_mad_queue *mad_queue)
2417 {
2418 mad_queue->qp_info = qp_info;
2419 mad_queue->count = 0;
2420 spin_lock_init(&mad_queue->lock);
2421 INIT_LIST_HEAD(&mad_queue->list);
2422 }
2423
2424 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2425 struct ib_mad_qp_info *qp_info)
2426 {
2427 qp_info->port_priv = port_priv;
2428 init_mad_queue(qp_info, &qp_info->send_queue);
2429 init_mad_queue(qp_info, &qp_info->recv_queue);
2430 INIT_LIST_HEAD(&qp_info->overflow_list);
2431 spin_lock_init(&qp_info->snoop_lock);
2432 qp_info->snoop_table = NULL;
2433 qp_info->snoop_table_size = 0;
2434 atomic_set(&qp_info->snoop_count, 0);
2435 }
2436
2437 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2438 enum ib_qp_type qp_type)
2439 {
2440 struct ib_qp_init_attr qp_init_attr;
2441 int ret;
2442
2443 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2444 qp_init_attr.send_cq = qp_info->port_priv->cq;
2445 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2446 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2447 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2448 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2449 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2450 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2451 qp_init_attr.qp_type = qp_type;
2452 qp_init_attr.port_num = qp_info->port_priv->port_num;
2453 qp_init_attr.qp_context = qp_info;
2454 qp_init_attr.event_handler = qp_event_handler;
2455 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2456 if (IS_ERR(qp_info->qp)) {
2457 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2458 get_spl_qp_index(qp_type));
2459 ret = PTR_ERR(qp_info->qp);
2460 goto error;
2461 }
2462 /* Use minimum queue sizes unless the CQ is resized */
2463 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2464 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2465 return 0;
2466
2467 error:
2468 return ret;
2469 }
2470
2471 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2472 {
2473 ib_destroy_qp(qp_info->qp);
2474 if (qp_info->snoop_table)
2475 kfree(qp_info->snoop_table);
2476 }
2477
2478 /*
2479 * Open the port
2480 * Create the QP, PD, MR, and CQ if needed
2481 */
2482 static int ib_mad_port_open(struct ib_device *device,
2483 int port_num)
2484 {
2485 int ret, cq_size;
2486 struct ib_mad_port_private *port_priv;
2487 unsigned long flags;
2488 char name[sizeof "ib_mad123"];
2489
2490 /* First, check if port already open at MAD layer */
2491 port_priv = ib_get_mad_port(device, port_num);
2492 if (port_priv) {
2493 printk(KERN_DEBUG PFX "%s port %d already open\n",
2494 device->name, port_num);
2495 return 0;
2496 }
2497
2498 /* Create new device info */
2499 port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
2500 if (!port_priv) {
2501 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2502 return -ENOMEM;
2503 }
2504 memset(port_priv, 0, sizeof *port_priv);
2505 port_priv->device = device;
2506 port_priv->port_num = port_num;
2507 spin_lock_init(&port_priv->reg_lock);
2508 INIT_LIST_HEAD(&port_priv->agent_list);
2509 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2510 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2511
2512 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2513 port_priv->cq = ib_create_cq(port_priv->device,
2514 (ib_comp_handler)
2515 ib_mad_thread_completion_handler,
2516 NULL, port_priv, cq_size);
2517 if (IS_ERR(port_priv->cq)) {
2518 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2519 ret = PTR_ERR(port_priv->cq);
2520 goto error3;
2521 }
2522
2523 port_priv->pd = ib_alloc_pd(device);
2524 if (IS_ERR(port_priv->pd)) {
2525 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2526 ret = PTR_ERR(port_priv->pd);
2527 goto error4;
2528 }
2529
2530 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2531 if (IS_ERR(port_priv->mr)) {
2532 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2533 ret = PTR_ERR(port_priv->mr);
2534 goto error5;
2535 }
2536
2537 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2538 if (ret)
2539 goto error6;
2540 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2541 if (ret)
2542 goto error7;
2543
2544 snprintf(name, sizeof name, "ib_mad%d", port_num);
2545 port_priv->wq = create_singlethread_workqueue(name);
2546 if (!port_priv->wq) {
2547 ret = -ENOMEM;
2548 goto error8;
2549 }
2550 INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2551
2552 ret = ib_mad_port_start(port_priv);
2553 if (ret) {
2554 printk(KERN_ERR PFX "Couldn't start port\n");
2555 goto error9;
2556 }
2557
2558 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2559 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2560 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2561 return 0;
2562
2563 error9:
2564 destroy_workqueue(port_priv->wq);
2565 error8:
2566 destroy_mad_qp(&port_priv->qp_info[1]);
2567 error7:
2568 destroy_mad_qp(&port_priv->qp_info[0]);
2569 error6:
2570 ib_dereg_mr(port_priv->mr);
2571 error5:
2572 ib_dealloc_pd(port_priv->pd);
2573 error4:
2574 ib_destroy_cq(port_priv->cq);
2575 cleanup_recv_queue(&port_priv->qp_info[1]);
2576 cleanup_recv_queue(&port_priv->qp_info[0]);
2577 error3:
2578 kfree(port_priv);
2579
2580 return ret;
2581 }
2582
2583 /*
2584 * Close the port
2585 * If there are no classes using the port, free the port
2586 * resources (CQ, MR, PD, QP) and remove the port's info structure
2587 */
2588 static int ib_mad_port_close(struct ib_device *device, int port_num)
2589 {
2590 struct ib_mad_port_private *port_priv;
2591 unsigned long flags;
2592
2593 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2594 port_priv = __ib_get_mad_port(device, port_num);
2595 if (port_priv == NULL) {
2596 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2597 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2598 return -ENODEV;
2599 }
2600 list_del(&port_priv->port_list);
2601 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2602
2603 /* Stop processing completions. */
2604 flush_workqueue(port_priv->wq);
2605 destroy_workqueue(port_priv->wq);
2606 destroy_mad_qp(&port_priv->qp_info[1]);
2607 destroy_mad_qp(&port_priv->qp_info[0]);
2608 ib_dereg_mr(port_priv->mr);
2609 ib_dealloc_pd(port_priv->pd);
2610 ib_destroy_cq(port_priv->cq);
2611 cleanup_recv_queue(&port_priv->qp_info[1]);
2612 cleanup_recv_queue(&port_priv->qp_info[0]);
2613 /* XXX: Handle deallocation of MAD registration tables */
2614
2615 kfree(port_priv);
2616
2617 return 0;
2618 }
2619
2620 static void ib_mad_init_device(struct ib_device *device)
2621 {
2622 int ret, num_ports, cur_port, i, ret2;
2623
2624 if (device->node_type == IB_NODE_SWITCH) {
2625 num_ports = 1;
2626 cur_port = 0;
2627 } else {
2628 num_ports = device->phys_port_cnt;
2629 cur_port = 1;
2630 }
2631 for (i = 0; i < num_ports; i++, cur_port++) {
2632 ret = ib_mad_port_open(device, cur_port);
2633 if (ret) {
2634 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2635 device->name, cur_port);
2636 goto error_device_open;
2637 }
2638 ret = ib_agent_port_open(device, cur_port);
2639 if (ret) {
2640 printk(KERN_ERR PFX "Couldn't open %s port %d "
2641 "for agents\n",
2642 device->name, cur_port);
2643 goto error_device_open;
2644 }
2645 }
2646
2647 goto error_device_query;
2648
2649 error_device_open:
2650 while (i > 0) {
2651 cur_port--;
2652 ret2 = ib_agent_port_close(device, cur_port);
2653 if (ret2) {
2654 printk(KERN_ERR PFX "Couldn't close %s port %d "
2655 "for agents\n",
2656 device->name, cur_port);
2657 }
2658 ret2 = ib_mad_port_close(device, cur_port);
2659 if (ret2) {
2660 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2661 device->name, cur_port);
2662 }
2663 i--;
2664 }
2665
2666 error_device_query:
2667 return;
2668 }
2669
2670 static void ib_mad_remove_device(struct ib_device *device)
2671 {
2672 int ret = 0, i, num_ports, cur_port, ret2;
2673
2674 if (device->node_type == IB_NODE_SWITCH) {
2675 num_ports = 1;
2676 cur_port = 0;
2677 } else {
2678 num_ports = device->phys_port_cnt;
2679 cur_port = 1;
2680 }
2681 for (i = 0; i < num_ports; i++, cur_port++) {
2682 ret2 = ib_agent_port_close(device, cur_port);
2683 if (ret2) {
2684 printk(KERN_ERR PFX "Couldn't close %s port %d "
2685 "for agents\n",
2686 device->name, cur_port);
2687 if (!ret)
2688 ret = ret2;
2689 }
2690 ret2 = ib_mad_port_close(device, cur_port);
2691 if (ret2) {
2692 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2693 device->name, cur_port);
2694 if (!ret)
2695 ret = ret2;
2696 }
2697 }
2698 }
2699
2700 static struct ib_client mad_client = {
2701 .name = "mad",
2702 .add = ib_mad_init_device,
2703 .remove = ib_mad_remove_device
2704 };
2705
2706 static int __init ib_mad_init_module(void)
2707 {
2708 int ret;
2709
2710 spin_lock_init(&ib_mad_port_list_lock);
2711 spin_lock_init(&ib_agent_port_list_lock);
2712
2713 ib_mad_cache = kmem_cache_create("ib_mad",
2714 sizeof(struct ib_mad_private),
2715 0,
2716 SLAB_HWCACHE_ALIGN,
2717 NULL,
2718 NULL);
2719 if (!ib_mad_cache) {
2720 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2721 ret = -ENOMEM;
2722 goto error1;
2723 }
2724
2725 INIT_LIST_HEAD(&ib_mad_port_list);
2726
2727 if (ib_register_client(&mad_client)) {
2728 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2729 ret = -EINVAL;
2730 goto error2;
2731 }
2732
2733 return 0;
2734
2735 error2:
2736 kmem_cache_destroy(ib_mad_cache);
2737 error1:
2738 return ret;
2739 }
2740
2741 static void __exit ib_mad_cleanup_module(void)
2742 {
2743 ib_unregister_client(&mad_client);
2744
2745 if (kmem_cache_destroy(ib_mad_cache)) {
2746 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2747 }
2748 }
2749
2750 module_init(ib_mad_init_module);
2751 module_exit(ib_mad_cleanup_module);
USB Experimental Work