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