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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / infiniband / core / mad.c
blob85ccf13b8041353db8c43b6b5bd91d4efb17b446
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 *
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 */
35 #include <linux/dma-mapping.h>
36 #include <rdma/ib_cache.h>
37
38 #include "mad_priv.h"
39 #include "mad_rmpp.h"
40 #include "smi.h"
41 #include "agent.h"
42
43 MODULE_LICENSE("Dual BSD/GPL");
44 MODULE_DESCRIPTION("kernel IB MAD API");
45 MODULE_AUTHOR("Hal Rosenstock");
46 MODULE_AUTHOR("Sean Hefty");
47
48 static struct kmem_cache *ib_mad_cache;
49
50 static struct list_head ib_mad_port_list;
51 static u32 ib_mad_client_id = 0;
52
53 /* Port list lock */
54 static spinlock_t ib_mad_port_list_lock;
55
56
57 /* Forward declarations */
58 static int method_in_use(struct ib_mad_mgmt_method_table **method,
59 struct ib_mad_reg_req *mad_reg_req);
60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
61 static struct ib_mad_agent_private *find_mad_agent(
62 struct ib_mad_port_private *port_priv,
63 struct ib_mad *mad);
64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
65 struct ib_mad_private *mad);
66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
67 static void timeout_sends(struct work_struct *work);
68 static void local_completions(struct work_struct *work);
69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
70 struct ib_mad_agent_private *agent_priv,
71 u8 mgmt_class);
72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
73 struct ib_mad_agent_private *agent_priv);
74
75 /*
76 * Returns a ib_mad_port_private structure or NULL for a device/port
77 * Assumes ib_mad_port_list_lock is being held
78 */
79 static inline struct ib_mad_port_private *
80 __ib_get_mad_port(struct ib_device *device, int port_num)
81 {
82 struct ib_mad_port_private *entry;
83
84 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
85 if (entry->device == device && entry->port_num == port_num)
86 return entry;
87 }
88 return NULL;
89 }
90
91 /*
92 * Wrapper function to return a ib_mad_port_private structure or NULL
93 * for a device/port
94 */
95 static inline struct ib_mad_port_private *
96 ib_get_mad_port(struct ib_device *device, int port_num)
97 {
98 struct ib_mad_port_private *entry;
99 unsigned long flags;
100
101 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
102 entry = __ib_get_mad_port(device, port_num);
103 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
104
105 return entry;
106 }
107
108 static inline u8 convert_mgmt_class(u8 mgmt_class)
109 {
110 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
111 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
112 0 : mgmt_class;
113 }
114
115 static int get_spl_qp_index(enum ib_qp_type qp_type)
116 {
117 switch (qp_type)
118 {
119 case IB_QPT_SMI:
120 return 0;
121 case IB_QPT_GSI:
122 return 1;
123 default:
124 return -1;
125 }
126 }
127
128 static int vendor_class_index(u8 mgmt_class)
129 {
130 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
131 }
132
133 static int is_vendor_class(u8 mgmt_class)
134 {
135 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
136 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
137 return 0;
138 return 1;
139 }
140
141 static int is_vendor_oui(char *oui)
142 {
143 if (oui[0] || oui[1] || oui[2])
144 return 1;
145 return 0;
146 }
147
148 static int is_vendor_method_in_use(
149 struct ib_mad_mgmt_vendor_class *vendor_class,
150 struct ib_mad_reg_req *mad_reg_req)
151 {
152 struct ib_mad_mgmt_method_table *method;
153 int i;
154
155 for (i = 0; i < MAX_MGMT_OUI; i++) {
156 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
157 method = vendor_class->method_table[i];
158 if (method) {
159 if (method_in_use(&method, mad_reg_req))
160 return 1;
161 else
162 break;
163 }
164 }
165 }
166 return 0;
167 }
168
169 int ib_response_mad(struct ib_mad *mad)
170 {
171 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
172 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
173 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
174 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
175 }
176 EXPORT_SYMBOL(ib_response_mad);
177
178 /*
179 * ib_register_mad_agent - Register to send/receive MADs
180 */
181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
182 u8 port_num,
183 enum ib_qp_type qp_type,
184 struct ib_mad_reg_req *mad_reg_req,
185 u8 rmpp_version,
186 ib_mad_send_handler send_handler,
187 ib_mad_recv_handler recv_handler,
188 void *context)
189 {
190 struct ib_mad_port_private *port_priv;
191 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
192 struct ib_mad_agent_private *mad_agent_priv;
193 struct ib_mad_reg_req *reg_req = NULL;
194 struct ib_mad_mgmt_class_table *class;
195 struct ib_mad_mgmt_vendor_class_table *vendor;
196 struct ib_mad_mgmt_vendor_class *vendor_class;
197 struct ib_mad_mgmt_method_table *method;
198 int ret2, qpn;
199 unsigned long flags;
200 u8 mgmt_class, vclass;
201
202 /* Validate parameters */
203 qpn = get_spl_qp_index(qp_type);
204 if (qpn == -1)
205 goto error1;
206
207 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
208 goto error1;
209
210 /* Validate MAD registration request if supplied */
211 if (mad_reg_req) {
212 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
213 goto error1;
214 if (!recv_handler)
215 goto error1;
216 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
217 /*
218 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
219 * one in this range currently allowed
220 */
221 if (mad_reg_req->mgmt_class !=
222 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
223 goto error1;
224 } else if (mad_reg_req->mgmt_class == 0) {
225 /*
226 * Class 0 is reserved in IBA and is used for
227 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
228 */
229 goto error1;
230 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
231 /*
232 * If class is in "new" vendor range,
233 * ensure supplied OUI is not zero
234 */
235 if (!is_vendor_oui(mad_reg_req->oui))
236 goto error1;
237 }
238 /* Make sure class supplied is consistent with RMPP */
239 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
240 if (rmpp_version)
241 goto error1;
242 }
243 /* Make sure class supplied is consistent with QP type */
244 if (qp_type == IB_QPT_SMI) {
245 if ((mad_reg_req->mgmt_class !=
246 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
247 (mad_reg_req->mgmt_class !=
248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
249 goto error1;
250 } else {
251 if ((mad_reg_req->mgmt_class ==
252 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
253 (mad_reg_req->mgmt_class ==
254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
255 goto error1;
256 }
257 } else {
258 /* No registration request supplied */
259 if (!send_handler)
260 goto error1;
261 }
262
263 /* Validate device and port */
264 port_priv = ib_get_mad_port(device, port_num);
265 if (!port_priv) {
266 ret = ERR_PTR(-ENODEV);
267 goto error1;
268 }
269
270 /* Allocate structures */
271 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
272 if (!mad_agent_priv) {
273 ret = ERR_PTR(-ENOMEM);
274 goto error1;
275 }
276
277 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
278 IB_ACCESS_LOCAL_WRITE);
279 if (IS_ERR(mad_agent_priv->agent.mr)) {
280 ret = ERR_PTR(-ENOMEM);
281 goto error2;
282 }
283
284 if (mad_reg_req) {
285 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
286 if (!reg_req) {
287 ret = ERR_PTR(-ENOMEM);
288 goto error3;
289 }
290 /* Make a copy of the MAD registration request */
291 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
292 }
293
294 /* Now, fill in the various structures */
295 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
296 mad_agent_priv->reg_req = reg_req;
297 mad_agent_priv->agent.rmpp_version = rmpp_version;
298 mad_agent_priv->agent.device = device;
299 mad_agent_priv->agent.recv_handler = recv_handler;
300 mad_agent_priv->agent.send_handler = send_handler;
301 mad_agent_priv->agent.context = context;
302 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
303 mad_agent_priv->agent.port_num = port_num;
304
305 spin_lock_irqsave(&port_priv->reg_lock, flags);
306 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
307
308 /*
309 * Make sure MAD registration (if supplied)
310 * is non overlapping with any existing ones
311 */
312 if (mad_reg_req) {
313 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
314 if (!is_vendor_class(mgmt_class)) {
315 class = port_priv->version[mad_reg_req->
316 mgmt_class_version].class;
317 if (class) {
318 method = class->method_table[mgmt_class];
319 if (method) {
320 if (method_in_use(&method,
321 mad_reg_req))
322 goto error4;
323 }
324 }
325 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
326 mgmt_class);
327 } else {
328 /* "New" vendor class range */
329 vendor = port_priv->version[mad_reg_req->
330 mgmt_class_version].vendor;
331 if (vendor) {
332 vclass = vendor_class_index(mgmt_class);
333 vendor_class = vendor->vendor_class[vclass];
334 if (vendor_class) {
335 if (is_vendor_method_in_use(
336 vendor_class,
337 mad_reg_req))
338 goto error4;
339 }
340 }
341 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
342 }
343 if (ret2) {
344 ret = ERR_PTR(ret2);
345 goto error4;
346 }
347 }
348
349 /* Add mad agent into port's agent list */
350 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
351 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
352
353 spin_lock_init(&mad_agent_priv->lock);
354 INIT_LIST_HEAD(&mad_agent_priv->send_list);
355 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
356 INIT_LIST_HEAD(&mad_agent_priv->done_list);
357 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
358 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
359 INIT_LIST_HEAD(&mad_agent_priv->local_list);
360 INIT_WORK(&mad_agent_priv->local_work, local_completions);
361 atomic_set(&mad_agent_priv->refcount, 1);
362 init_completion(&mad_agent_priv->comp);
363
364 return &mad_agent_priv->agent;
365
366 error4:
367 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
368 kfree(reg_req);
369 error3:
370 ib_dereg_mr(mad_agent_priv->agent.mr);
371 error2:
372 kfree(mad_agent_priv);
373 error1:
374 return ret;
375 }
376 EXPORT_SYMBOL(ib_register_mad_agent);
377
378 static inline int is_snooping_sends(int mad_snoop_flags)
379 {
380 return (mad_snoop_flags &
381 (/*IB_MAD_SNOOP_POSTED_SENDS |
382 IB_MAD_SNOOP_RMPP_SENDS |*/
383 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
384 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
385 }
386
387 static inline int is_snooping_recvs(int mad_snoop_flags)
388 {
389 return (mad_snoop_flags &
390 (IB_MAD_SNOOP_RECVS /*|
391 IB_MAD_SNOOP_RMPP_RECVS*/));
392 }
393
394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
395 struct ib_mad_snoop_private *mad_snoop_priv)
396 {
397 struct ib_mad_snoop_private **new_snoop_table;
398 unsigned long flags;
399 int i;
400
401 spin_lock_irqsave(&qp_info->snoop_lock, flags);
402 /* Check for empty slot in array. */
403 for (i = 0; i < qp_info->snoop_table_size; i++)
404 if (!qp_info->snoop_table[i])
405 break;
406
407 if (i == qp_info->snoop_table_size) {
408 /* Grow table. */
409 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
410 qp_info->snoop_table_size + 1,
411 GFP_ATOMIC);
412 if (!new_snoop_table) {
413 i = -ENOMEM;
414 goto out;
415 }
416 if (qp_info->snoop_table) {
417 memcpy(new_snoop_table, qp_info->snoop_table,
418 sizeof mad_snoop_priv *
419 qp_info->snoop_table_size);
420 kfree(qp_info->snoop_table);
421 }
422 qp_info->snoop_table = new_snoop_table;
423 qp_info->snoop_table_size++;
424 }
425 qp_info->snoop_table[i] = mad_snoop_priv;
426 atomic_inc(&qp_info->snoop_count);
427 out:
428 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
429 return i;
430 }
431
432 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
433 u8 port_num,
434 enum ib_qp_type qp_type,
435 int mad_snoop_flags,
436 ib_mad_snoop_handler snoop_handler,
437 ib_mad_recv_handler recv_handler,
438 void *context)
439 {
440 struct ib_mad_port_private *port_priv;
441 struct ib_mad_agent *ret;
442 struct ib_mad_snoop_private *mad_snoop_priv;
443 int qpn;
444
445 /* Validate parameters */
446 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
447 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
448 ret = ERR_PTR(-EINVAL);
449 goto error1;
450 }
451 qpn = get_spl_qp_index(qp_type);
452 if (qpn == -1) {
453 ret = ERR_PTR(-EINVAL);
454 goto error1;
455 }
456 port_priv = ib_get_mad_port(device, port_num);
457 if (!port_priv) {
458 ret = ERR_PTR(-ENODEV);
459 goto error1;
460 }
461 /* Allocate structures */
462 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
463 if (!mad_snoop_priv) {
464 ret = ERR_PTR(-ENOMEM);
465 goto error1;
466 }
467
468 /* Now, fill in the various structures */
469 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
470 mad_snoop_priv->agent.device = device;
471 mad_snoop_priv->agent.recv_handler = recv_handler;
472 mad_snoop_priv->agent.snoop_handler = snoop_handler;
473 mad_snoop_priv->agent.context = context;
474 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
475 mad_snoop_priv->agent.port_num = port_num;
476 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
477 init_completion(&mad_snoop_priv->comp);
478 mad_snoop_priv->snoop_index = register_snoop_agent(
479 &port_priv->qp_info[qpn],
480 mad_snoop_priv);
481 if (mad_snoop_priv->snoop_index < 0) {
482 ret = ERR_PTR(mad_snoop_priv->snoop_index);
483 goto error2;
484 }
485
486 atomic_set(&mad_snoop_priv->refcount, 1);
487 return &mad_snoop_priv->agent;
488
489 error2:
490 kfree(mad_snoop_priv);
491 error1:
492 return ret;
493 }
494 EXPORT_SYMBOL(ib_register_mad_snoop);
495
496 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
497 {
498 if (atomic_dec_and_test(&mad_agent_priv->refcount))
499 complete(&mad_agent_priv->comp);
500 }
501
502 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
503 {
504 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
505 complete(&mad_snoop_priv->comp);
506 }
507
508 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
509 {
510 struct ib_mad_port_private *port_priv;
511 unsigned long flags;
512
513 /* Note that we could still be handling received MADs */
514
515 /*
516 * Canceling all sends results in dropping received response
517 * MADs, preventing us from queuing additional work
518 */
519 cancel_mads(mad_agent_priv);
520 port_priv = mad_agent_priv->qp_info->port_priv;
521 cancel_delayed_work(&mad_agent_priv->timed_work);
522
523 spin_lock_irqsave(&port_priv->reg_lock, flags);
524 remove_mad_reg_req(mad_agent_priv);
525 list_del(&mad_agent_priv->agent_list);
526 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
527
528 flush_workqueue(port_priv->wq);
529 ib_cancel_rmpp_recvs(mad_agent_priv);
530
531 deref_mad_agent(mad_agent_priv);
532 wait_for_completion(&mad_agent_priv->comp);
533
534 kfree(mad_agent_priv->reg_req);
535 ib_dereg_mr(mad_agent_priv->agent.mr);
536 kfree(mad_agent_priv);
537 }
538
539 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
540 {
541 struct ib_mad_qp_info *qp_info;
542 unsigned long flags;
543
544 qp_info = mad_snoop_priv->qp_info;
545 spin_lock_irqsave(&qp_info->snoop_lock, flags);
546 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
547 atomic_dec(&qp_info->snoop_count);
548 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
549
550 deref_snoop_agent(mad_snoop_priv);
551 wait_for_completion(&mad_snoop_priv->comp);
552
553 kfree(mad_snoop_priv);
554 }
555
556 /*
557 * ib_unregister_mad_agent - Unregisters a client from using MAD services
558 */
559 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
560 {
561 struct ib_mad_agent_private *mad_agent_priv;
562 struct ib_mad_snoop_private *mad_snoop_priv;
563
564 /* If the TID is zero, the agent can only snoop. */
565 if (mad_agent->hi_tid) {
566 mad_agent_priv = container_of(mad_agent,
567 struct ib_mad_agent_private,
568 agent);
569 unregister_mad_agent(mad_agent_priv);
570 } else {
571 mad_snoop_priv = container_of(mad_agent,
572 struct ib_mad_snoop_private,
573 agent);
574 unregister_mad_snoop(mad_snoop_priv);
575 }
576 return 0;
577 }
578 EXPORT_SYMBOL(ib_unregister_mad_agent);
579
580 static void dequeue_mad(struct ib_mad_list_head *mad_list)
581 {
582 struct ib_mad_queue *mad_queue;
583 unsigned long flags;
584
585 BUG_ON(!mad_list->mad_queue);
586 mad_queue = mad_list->mad_queue;
587 spin_lock_irqsave(&mad_queue->lock, flags);
588 list_del(&mad_list->list);
589 mad_queue->count--;
590 spin_unlock_irqrestore(&mad_queue->lock, flags);
591 }
592
593 static void snoop_send(struct ib_mad_qp_info *qp_info,
594 struct ib_mad_send_buf *send_buf,
595 struct ib_mad_send_wc *mad_send_wc,
596 int mad_snoop_flags)
597 {
598 struct ib_mad_snoop_private *mad_snoop_priv;
599 unsigned long flags;
600 int i;
601
602 spin_lock_irqsave(&qp_info->snoop_lock, flags);
603 for (i = 0; i < qp_info->snoop_table_size; i++) {
604 mad_snoop_priv = qp_info->snoop_table[i];
605 if (!mad_snoop_priv ||
606 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
607 continue;
608
609 atomic_inc(&mad_snoop_priv->refcount);
610 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
611 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
612 send_buf, mad_send_wc);
613 deref_snoop_agent(mad_snoop_priv);
614 spin_lock_irqsave(&qp_info->snoop_lock, flags);
615 }
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617 }
618
619 static void snoop_recv(struct ib_mad_qp_info *qp_info,
620 struct ib_mad_recv_wc *mad_recv_wc,
621 int mad_snoop_flags)
622 {
623 struct ib_mad_snoop_private *mad_snoop_priv;
624 unsigned long flags;
625 int i;
626
627 spin_lock_irqsave(&qp_info->snoop_lock, flags);
628 for (i = 0; i < qp_info->snoop_table_size; i++) {
629 mad_snoop_priv = qp_info->snoop_table[i];
630 if (!mad_snoop_priv ||
631 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
632 continue;
633
634 atomic_inc(&mad_snoop_priv->refcount);
635 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
636 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
637 mad_recv_wc);
638 deref_snoop_agent(mad_snoop_priv);
639 spin_lock_irqsave(&qp_info->snoop_lock, flags);
640 }
641 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
642 }
643
644 static void build_smp_wc(struct ib_qp *qp,
645 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
646 struct ib_wc *wc)
647 {
648 memset(wc, 0, sizeof *wc);
649 wc->wr_id = wr_id;
650 wc->status = IB_WC_SUCCESS;
651 wc->opcode = IB_WC_RECV;
652 wc->pkey_index = pkey_index;
653 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
654 wc->src_qp = IB_QP0;
655 wc->qp = qp;
656 wc->slid = slid;
657 wc->sl = 0;
658 wc->dlid_path_bits = 0;
659 wc->port_num = port_num;
660 }
661
662 /*
663 * Return 0 if SMP is to be sent
664 * Return 1 if SMP was consumed locally (whether or not solicited)
665 * Return < 0 if error
666 */
667 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
668 struct ib_mad_send_wr_private *mad_send_wr)
669 {
670 int ret = 0;
671 struct ib_smp *smp = mad_send_wr->send_buf.mad;
672 unsigned long flags;
673 struct ib_mad_local_private *local;
674 struct ib_mad_private *mad_priv;
675 struct ib_mad_port_private *port_priv;
676 struct ib_mad_agent_private *recv_mad_agent = NULL;
677 struct ib_device *device = mad_agent_priv->agent.device;
678 u8 port_num = mad_agent_priv->agent.port_num;
679 struct ib_wc mad_wc;
680 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
681
682 /*
683 * Directed route handling starts if the initial LID routed part of
684 * a request or the ending LID routed part of a response is empty.
685 * If we are at the start of the LID routed part, don't update the
686 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
687 */
688 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
689 IB_LID_PERMISSIVE &&
690 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
691 IB_SMI_DISCARD) {
692 ret = -EINVAL;
693 printk(KERN_ERR PFX "Invalid directed route\n");
694 goto out;
695 }
696
697 /* Check to post send on QP or process locally */
698 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD)
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 IB_SMI_DISCARD)
1882 goto out;
1883
1884 if (smi_check_forward_dr_smp(&recv->mad.smp) == IB_SMI_LOCAL)
1885 goto local;
1886
1887 if (smi_handle_dr_smp_send(&recv->mad.smp,
1888 port_priv->device->node_type,
1889 port_priv->port_num) == IB_SMI_DISCARD)
1890 goto out;
1891
1892 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1893 goto out;
1894 }
1895
1896 local:
1897 /* Give driver "right of first refusal" on incoming MAD */
1898 if (port_priv->device->process_mad) {
1899 int ret;
1900
1901 if (!response) {
1902 printk(KERN_ERR PFX "No memory for response MAD\n");
1903 /*
1904 * Is it better to assume that
1905 * it wouldn't be processed ?
1906 */
1907 goto out;
1908 }
1909
1910 ret = port_priv->device->process_mad(port_priv->device, 0,
1911 port_priv->port_num,
1912 wc, &recv->grh,
1913 &recv->mad.mad,
1914 &response->mad.mad);
1915 if (ret & IB_MAD_RESULT_SUCCESS) {
1916 if (ret & IB_MAD_RESULT_CONSUMED)
1917 goto out;
1918 if (ret & IB_MAD_RESULT_REPLY) {
1919 agent_send_response(&response->mad.mad,
1920 &recv->grh, wc,
1921 port_priv->device,
1922 port_priv->port_num,
1923 qp_info->qp->qp_num);
1924 goto out;
1925 }
1926 }
1927 }
1928
1929 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1930 if (mad_agent) {
1931 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1932 /*
1933 * recv is freed up in error cases in ib_mad_complete_recv
1934 * or via recv_handler in ib_mad_complete_recv()
1935 */
1936 recv = NULL;
1937 }
1938
1939 out:
1940 /* Post another receive request for this QP */
1941 if (response) {
1942 ib_mad_post_receive_mads(qp_info, response);
1943 if (recv)
1944 kmem_cache_free(ib_mad_cache, recv);
1945 } else
1946 ib_mad_post_receive_mads(qp_info, recv);
1947 }
1948
1949 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1950 {
1951 struct ib_mad_send_wr_private *mad_send_wr;
1952 unsigned long delay;
1953
1954 if (list_empty(&mad_agent_priv->wait_list)) {
1955 cancel_delayed_work(&mad_agent_priv->timed_work);
1956 } else {
1957 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1958 struct ib_mad_send_wr_private,
1959 agent_list);
1960
1961 if (time_after(mad_agent_priv->timeout,
1962 mad_send_wr->timeout)) {
1963 mad_agent_priv->timeout = mad_send_wr->timeout;
1964 cancel_delayed_work(&mad_agent_priv->timed_work);
1965 delay = mad_send_wr->timeout - jiffies;
1966 if ((long)delay <= 0)
1967 delay = 1;
1968 queue_delayed_work(mad_agent_priv->qp_info->
1969 port_priv->wq,
1970 &mad_agent_priv->timed_work, delay);
1971 }
1972 }
1973 }
1974
1975 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1976 {
1977 struct ib_mad_agent_private *mad_agent_priv;
1978 struct ib_mad_send_wr_private *temp_mad_send_wr;
1979 struct list_head *list_item;
1980 unsigned long delay;
1981
1982 mad_agent_priv = mad_send_wr->mad_agent_priv;
1983 list_del(&mad_send_wr->agent_list);
1984
1985 delay = mad_send_wr->timeout;
1986 mad_send_wr->timeout += jiffies;
1987
1988 if (delay) {
1989 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1990 temp_mad_send_wr = list_entry(list_item,
1991 struct ib_mad_send_wr_private,
1992 agent_list);
1993 if (time_after(mad_send_wr->timeout,
1994 temp_mad_send_wr->timeout))
1995 break;
1996 }
1997 }
1998 else
1999 list_item = &mad_agent_priv->wait_list;
2000 list_add(&mad_send_wr->agent_list, list_item);
2001
2002 /* Reschedule a work item if we have a shorter timeout */
2003 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2004 cancel_delayed_work(&mad_agent_priv->timed_work);
2005 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2006 &mad_agent_priv->timed_work, delay);
2007 }
2008 }
2009
2010 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2011 int timeout_ms)
2012 {
2013 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2014 wait_for_response(mad_send_wr);
2015 }
2016
2017 /*
2018 * Process a send work completion
2019 */
2020 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2021 struct ib_mad_send_wc *mad_send_wc)
2022 {
2023 struct ib_mad_agent_private *mad_agent_priv;
2024 unsigned long flags;
2025 int ret;
2026
2027 mad_agent_priv = mad_send_wr->mad_agent_priv;
2028 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2029 if (mad_agent_priv->agent.rmpp_version) {
2030 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2031 if (ret == IB_RMPP_RESULT_CONSUMED)
2032 goto done;
2033 } else
2034 ret = IB_RMPP_RESULT_UNHANDLED;
2035
2036 if (mad_send_wc->status != IB_WC_SUCCESS &&
2037 mad_send_wr->status == IB_WC_SUCCESS) {
2038 mad_send_wr->status = mad_send_wc->status;
2039 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2040 }
2041
2042 if (--mad_send_wr->refcount > 0) {
2043 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2044 mad_send_wr->status == IB_WC_SUCCESS) {
2045 wait_for_response(mad_send_wr);
2046 }
2047 goto done;
2048 }
2049
2050 /* Remove send from MAD agent and notify client of completion */
2051 list_del(&mad_send_wr->agent_list);
2052 adjust_timeout(mad_agent_priv);
2053 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2054
2055 if (mad_send_wr->status != IB_WC_SUCCESS )
2056 mad_send_wc->status = mad_send_wr->status;
2057 if (ret == IB_RMPP_RESULT_INTERNAL)
2058 ib_rmpp_send_handler(mad_send_wc);
2059 else
2060 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2061 mad_send_wc);
2062
2063 /* Release reference on agent taken when sending */
2064 deref_mad_agent(mad_agent_priv);
2065 return;
2066 done:
2067 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2068 }
2069
2070 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2071 struct ib_wc *wc)
2072 {
2073 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2074 struct ib_mad_list_head *mad_list;
2075 struct ib_mad_qp_info *qp_info;
2076 struct ib_mad_queue *send_queue;
2077 struct ib_send_wr *bad_send_wr;
2078 struct ib_mad_send_wc mad_send_wc;
2079 unsigned long flags;
2080 int ret;
2081
2082 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2083 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2084 mad_list);
2085 send_queue = mad_list->mad_queue;
2086 qp_info = send_queue->qp_info;
2087
2088 retry:
2089 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2090 mad_send_wr->header_mapping,
2091 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2092 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2093 mad_send_wr->payload_mapping,
2094 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2095 queued_send_wr = NULL;
2096 spin_lock_irqsave(&send_queue->lock, flags);
2097 list_del(&mad_list->list);
2098
2099 /* Move queued send to the send queue */
2100 if (send_queue->count-- > send_queue->max_active) {
2101 mad_list = container_of(qp_info->overflow_list.next,
2102 struct ib_mad_list_head, list);
2103 queued_send_wr = container_of(mad_list,
2104 struct ib_mad_send_wr_private,
2105 mad_list);
2106 list_move_tail(&mad_list->list, &send_queue->list);
2107 }
2108 spin_unlock_irqrestore(&send_queue->lock, flags);
2109
2110 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2111 mad_send_wc.status = wc->status;
2112 mad_send_wc.vendor_err = wc->vendor_err;
2113 if (atomic_read(&qp_info->snoop_count))
2114 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2115 IB_MAD_SNOOP_SEND_COMPLETIONS);
2116 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2117
2118 if (queued_send_wr) {
2119 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2120 &bad_send_wr);
2121 if (ret) {
2122 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2123 mad_send_wr = queued_send_wr;
2124 wc->status = IB_WC_LOC_QP_OP_ERR;
2125 goto retry;
2126 }
2127 }
2128 }
2129
2130 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2131 {
2132 struct ib_mad_send_wr_private *mad_send_wr;
2133 struct ib_mad_list_head *mad_list;
2134 unsigned long flags;
2135
2136 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2137 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2138 mad_send_wr = container_of(mad_list,
2139 struct ib_mad_send_wr_private,
2140 mad_list);
2141 mad_send_wr->retry = 1;
2142 }
2143 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2144 }
2145
2146 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2147 struct ib_wc *wc)
2148 {
2149 struct ib_mad_list_head *mad_list;
2150 struct ib_mad_qp_info *qp_info;
2151 struct ib_mad_send_wr_private *mad_send_wr;
2152 int ret;
2153
2154 /* Determine if failure was a send or receive */
2155 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2156 qp_info = mad_list->mad_queue->qp_info;
2157 if (mad_list->mad_queue == &qp_info->recv_queue)
2158 /*
2159 * Receive errors indicate that the QP has entered the error
2160 * state - error handling/shutdown code will cleanup
2161 */
2162 return;
2163
2164 /*
2165 * Send errors will transition the QP to SQE - move
2166 * QP to RTS and repost flushed work requests
2167 */
2168 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2169 mad_list);
2170 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2171 if (mad_send_wr->retry) {
2172 /* Repost send */
2173 struct ib_send_wr *bad_send_wr;
2174
2175 mad_send_wr->retry = 0;
2176 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2177 &bad_send_wr);
2178 if (ret)
2179 ib_mad_send_done_handler(port_priv, wc);
2180 } else
2181 ib_mad_send_done_handler(port_priv, wc);
2182 } else {
2183 struct ib_qp_attr *attr;
2184
2185 /* Transition QP to RTS and fail offending send */
2186 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2187 if (attr) {
2188 attr->qp_state = IB_QPS_RTS;
2189 attr->cur_qp_state = IB_QPS_SQE;
2190 ret = ib_modify_qp(qp_info->qp, attr,
2191 IB_QP_STATE | IB_QP_CUR_STATE);
2192 kfree(attr);
2193 if (ret)
2194 printk(KERN_ERR PFX "mad_error_handler - "
2195 "ib_modify_qp to RTS : %d\n", ret);
2196 else
2197 mark_sends_for_retry(qp_info);
2198 }
2199 ib_mad_send_done_handler(port_priv, wc);
2200 }
2201 }
2202
2203 /*
2204 * IB MAD completion callback
2205 */
2206 static void ib_mad_completion_handler(struct work_struct *work)
2207 {
2208 struct ib_mad_port_private *port_priv;
2209 struct ib_wc wc;
2210
2211 port_priv = container_of(work, struct ib_mad_port_private, work);
2212 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2213
2214 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2215 if (wc.status == IB_WC_SUCCESS) {
2216 switch (wc.opcode) {
2217 case IB_WC_SEND:
2218 ib_mad_send_done_handler(port_priv, &wc);
2219 break;
2220 case IB_WC_RECV:
2221 ib_mad_recv_done_handler(port_priv, &wc);
2222 break;
2223 default:
2224 BUG_ON(1);
2225 break;
2226 }
2227 } else
2228 mad_error_handler(port_priv, &wc);
2229 }
2230 }
2231
2232 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2233 {
2234 unsigned long flags;
2235 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2236 struct ib_mad_send_wc mad_send_wc;
2237 struct list_head cancel_list;
2238
2239 INIT_LIST_HEAD(&cancel_list);
2240
2241 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2242 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2243 &mad_agent_priv->send_list, agent_list) {
2244 if (mad_send_wr->status == IB_WC_SUCCESS) {
2245 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2246 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2247 }
2248 }
2249
2250 /* Empty wait list to prevent receives from finding a request */
2251 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2252 /* Empty local completion list as well */
2253 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2254 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2255
2256 /* Report all cancelled requests */
2257 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2258 mad_send_wc.vendor_err = 0;
2259
2260 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2261 &cancel_list, agent_list) {
2262 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2263 list_del(&mad_send_wr->agent_list);
2264 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2265 &mad_send_wc);
2266 atomic_dec(&mad_agent_priv->refcount);
2267 }
2268 }
2269
2270 static struct ib_mad_send_wr_private*
2271 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2272 struct ib_mad_send_buf *send_buf)
2273 {
2274 struct ib_mad_send_wr_private *mad_send_wr;
2275
2276 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2277 agent_list) {
2278 if (&mad_send_wr->send_buf == send_buf)
2279 return mad_send_wr;
2280 }
2281
2282 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2283 agent_list) {
2284 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2285 &mad_send_wr->send_buf == send_buf)
2286 return mad_send_wr;
2287 }
2288 return NULL;
2289 }
2290
2291 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2292 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2293 {
2294 struct ib_mad_agent_private *mad_agent_priv;
2295 struct ib_mad_send_wr_private *mad_send_wr;
2296 unsigned long flags;
2297 int active;
2298
2299 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2300 agent);
2301 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2302 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2303 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2304 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2305 return -EINVAL;
2306 }
2307
2308 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2309 if (!timeout_ms) {
2310 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2311 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2312 }
2313
2314 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2315 if (active)
2316 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2317 else
2318 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2319
2320 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2321 return 0;
2322 }
2323 EXPORT_SYMBOL(ib_modify_mad);
2324
2325 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2326 struct ib_mad_send_buf *send_buf)
2327 {
2328 ib_modify_mad(mad_agent, send_buf, 0);
2329 }
2330 EXPORT_SYMBOL(ib_cancel_mad);
2331
2332 static void local_completions(struct work_struct *work)
2333 {
2334 struct ib_mad_agent_private *mad_agent_priv;
2335 struct ib_mad_local_private *local;
2336 struct ib_mad_agent_private *recv_mad_agent;
2337 unsigned long flags;
2338 int recv = 0;
2339 struct ib_wc wc;
2340 struct ib_mad_send_wc mad_send_wc;
2341
2342 mad_agent_priv =
2343 container_of(work, struct ib_mad_agent_private, local_work);
2344
2345 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2346 while (!list_empty(&mad_agent_priv->local_list)) {
2347 local = list_entry(mad_agent_priv->local_list.next,
2348 struct ib_mad_local_private,
2349 completion_list);
2350 list_del(&local->completion_list);
2351 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2352 if (local->mad_priv) {
2353 recv_mad_agent = local->recv_mad_agent;
2354 if (!recv_mad_agent) {
2355 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2356 goto local_send_completion;
2357 }
2358
2359 recv = 1;
2360 /*
2361 * Defined behavior is to complete response
2362 * before request
2363 */
2364 build_smp_wc(recv_mad_agent->agent.qp,
2365 (unsigned long) local->mad_send_wr,
2366 be16_to_cpu(IB_LID_PERMISSIVE),
2367 0, recv_mad_agent->agent.port_num, &wc);
2368
2369 local->mad_priv->header.recv_wc.wc = &wc;
2370 local->mad_priv->header.recv_wc.mad_len =
2371 sizeof(struct ib_mad);
2372 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2373 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2374 &local->mad_priv->header.recv_wc.rmpp_list);
2375 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2376 local->mad_priv->header.recv_wc.recv_buf.mad =
2377 &local->mad_priv->mad.mad;
2378 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2379 snoop_recv(recv_mad_agent->qp_info,
2380 &local->mad_priv->header.recv_wc,
2381 IB_MAD_SNOOP_RECVS);
2382 recv_mad_agent->agent.recv_handler(
2383 &recv_mad_agent->agent,
2384 &local->mad_priv->header.recv_wc);
2385 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2386 atomic_dec(&recv_mad_agent->refcount);
2387 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2388 }
2389
2390 local_send_completion:
2391 /* Complete send */
2392 mad_send_wc.status = IB_WC_SUCCESS;
2393 mad_send_wc.vendor_err = 0;
2394 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2395 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2396 snoop_send(mad_agent_priv->qp_info,
2397 &local->mad_send_wr->send_buf,
2398 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2399 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2400 &mad_send_wc);
2401
2402 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2403 atomic_dec(&mad_agent_priv->refcount);
2404 if (!recv)
2405 kmem_cache_free(ib_mad_cache, local->mad_priv);
2406 kfree(local);
2407 }
2408 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2409 }
2410
2411 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2412 {
2413 int ret;
2414
2415 if (!mad_send_wr->retries--)
2416 return -ETIMEDOUT;
2417
2418 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2419
2420 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2421 ret = ib_retry_rmpp(mad_send_wr);
2422 switch (ret) {
2423 case IB_RMPP_RESULT_UNHANDLED:
2424 ret = ib_send_mad(mad_send_wr);
2425 break;
2426 case IB_RMPP_RESULT_CONSUMED:
2427 ret = 0;
2428 break;
2429 default:
2430 ret = -ECOMM;
2431 break;
2432 }
2433 } else
2434 ret = ib_send_mad(mad_send_wr);
2435
2436 if (!ret) {
2437 mad_send_wr->refcount++;
2438 list_add_tail(&mad_send_wr->agent_list,
2439 &mad_send_wr->mad_agent_priv->send_list);
2440 }
2441 return ret;
2442 }
2443
2444 static void timeout_sends(struct work_struct *work)
2445 {
2446 struct ib_mad_agent_private *mad_agent_priv;
2447 struct ib_mad_send_wr_private *mad_send_wr;
2448 struct ib_mad_send_wc mad_send_wc;
2449 unsigned long flags, delay;
2450
2451 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2452 timed_work.work);
2453 mad_send_wc.vendor_err = 0;
2454
2455 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2456 while (!list_empty(&mad_agent_priv->wait_list)) {
2457 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2458 struct ib_mad_send_wr_private,
2459 agent_list);
2460
2461 if (time_after(mad_send_wr->timeout, jiffies)) {
2462 delay = mad_send_wr->timeout - jiffies;
2463 if ((long)delay <= 0)
2464 delay = 1;
2465 queue_delayed_work(mad_agent_priv->qp_info->
2466 port_priv->wq,
2467 &mad_agent_priv->timed_work, delay);
2468 break;
2469 }
2470
2471 list_del(&mad_send_wr->agent_list);
2472 if (mad_send_wr->status == IB_WC_SUCCESS &&
2473 !retry_send(mad_send_wr))
2474 continue;
2475
2476 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2477
2478 if (mad_send_wr->status == IB_WC_SUCCESS)
2479 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2480 else
2481 mad_send_wc.status = mad_send_wr->status;
2482 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2483 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2484 &mad_send_wc);
2485
2486 atomic_dec(&mad_agent_priv->refcount);
2487 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2488 }
2489 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2490 }
2491
2492 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2493 {
2494 struct ib_mad_port_private *port_priv = cq->cq_context;
2495 unsigned long flags;
2496
2497 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2498 if (!list_empty(&port_priv->port_list))
2499 queue_work(port_priv->wq, &port_priv->work);
2500 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2501 }
2502
2503 /*
2504 * Allocate receive MADs and post receive WRs for them
2505 */
2506 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2507 struct ib_mad_private *mad)
2508 {
2509 unsigned long flags;
2510 int post, ret;
2511 struct ib_mad_private *mad_priv;
2512 struct ib_sge sg_list;
2513 struct ib_recv_wr recv_wr, *bad_recv_wr;
2514 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2515
2516 /* Initialize common scatter list fields */
2517 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2518 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2519
2520 /* Initialize common receive WR fields */
2521 recv_wr.next = NULL;
2522 recv_wr.sg_list = &sg_list;
2523 recv_wr.num_sge = 1;
2524
2525 do {
2526 /* Allocate and map receive buffer */
2527 if (mad) {
2528 mad_priv = mad;
2529 mad = NULL;
2530 } else {
2531 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2532 if (!mad_priv) {
2533 printk(KERN_ERR PFX "No memory for receive buffer\n");
2534 ret = -ENOMEM;
2535 break;
2536 }
2537 }
2538 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2539 &mad_priv->grh,
2540 sizeof *mad_priv -
2541 sizeof mad_priv->header,
2542 DMA_FROM_DEVICE);
2543 mad_priv->header.mapping = sg_list.addr;
2544 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2545 mad_priv->header.mad_list.mad_queue = recv_queue;
2546
2547 /* Post receive WR */
2548 spin_lock_irqsave(&recv_queue->lock, flags);
2549 post = (++recv_queue->count < recv_queue->max_active);
2550 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2551 spin_unlock_irqrestore(&recv_queue->lock, flags);
2552 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2553 if (ret) {
2554 spin_lock_irqsave(&recv_queue->lock, flags);
2555 list_del(&mad_priv->header.mad_list.list);
2556 recv_queue->count--;
2557 spin_unlock_irqrestore(&recv_queue->lock, flags);
2558 ib_dma_unmap_single(qp_info->port_priv->device,
2559 mad_priv->header.mapping,
2560 sizeof *mad_priv -
2561 sizeof mad_priv->header,
2562 DMA_FROM_DEVICE);
2563 kmem_cache_free(ib_mad_cache, mad_priv);
2564 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2565 break;
2566 }
2567 } while (post);
2568
2569 return ret;
2570 }
2571
2572 /*
2573 * Return all the posted receive MADs
2574 */
2575 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2576 {
2577 struct ib_mad_private_header *mad_priv_hdr;
2578 struct ib_mad_private *recv;
2579 struct ib_mad_list_head *mad_list;
2580
2581 while (!list_empty(&qp_info->recv_queue.list)) {
2582
2583 mad_list = list_entry(qp_info->recv_queue.list.next,
2584 struct ib_mad_list_head, list);
2585 mad_priv_hdr = container_of(mad_list,
2586 struct ib_mad_private_header,
2587 mad_list);
2588 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2589 header);
2590
2591 /* Remove from posted receive MAD list */
2592 list_del(&mad_list->list);
2593
2594 ib_dma_unmap_single(qp_info->port_priv->device,
2595 recv->header.mapping,
2596 sizeof(struct ib_mad_private) -
2597 sizeof(struct ib_mad_private_header),
2598 DMA_FROM_DEVICE);
2599 kmem_cache_free(ib_mad_cache, recv);
2600 }
2601
2602 qp_info->recv_queue.count = 0;
2603 }
2604
2605 /*
2606 * Start the port
2607 */
2608 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2609 {
2610 int ret, i;
2611 struct ib_qp_attr *attr;
2612 struct ib_qp *qp;
2613
2614 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2615 if (!attr) {
2616 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2617 return -ENOMEM;
2618 }
2619
2620 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2621 qp = port_priv->qp_info[i].qp;
2622 /*
2623 * PKey index for QP1 is irrelevant but
2624 * one is needed for the Reset to Init transition
2625 */
2626 attr->qp_state = IB_QPS_INIT;
2627 attr->pkey_index = 0;
2628 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2629 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2630 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2631 if (ret) {
2632 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2633 "INIT: %d\n", i, ret);
2634 goto out;
2635 }
2636
2637 attr->qp_state = IB_QPS_RTR;
2638 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2639 if (ret) {
2640 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2641 "RTR: %d\n", i, ret);
2642 goto out;
2643 }
2644
2645 attr->qp_state = IB_QPS_RTS;
2646 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2647 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2648 if (ret) {
2649 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2650 "RTS: %d\n", i, ret);
2651 goto out;
2652 }
2653 }
2654
2655 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2656 if (ret) {
2657 printk(KERN_ERR PFX "Failed to request completion "
2658 "notification: %d\n", ret);
2659 goto out;
2660 }
2661
2662 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2663 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2664 if (ret) {
2665 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2666 goto out;
2667 }
2668 }
2669 out:
2670 kfree(attr);
2671 return ret;
2672 }
2673
2674 static void qp_event_handler(struct ib_event *event, void *qp_context)
2675 {
2676 struct ib_mad_qp_info *qp_info = qp_context;
2677
2678 /* It's worse than that! He's dead, Jim! */
2679 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2680 event->event, qp_info->qp->qp_num);
2681 }
2682
2683 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2684 struct ib_mad_queue *mad_queue)
2685 {
2686 mad_queue->qp_info = qp_info;
2687 mad_queue->count = 0;
2688 spin_lock_init(&mad_queue->lock);
2689 INIT_LIST_HEAD(&mad_queue->list);
2690 }
2691
2692 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2693 struct ib_mad_qp_info *qp_info)
2694 {
2695 qp_info->port_priv = port_priv;
2696 init_mad_queue(qp_info, &qp_info->send_queue);
2697 init_mad_queue(qp_info, &qp_info->recv_queue);
2698 INIT_LIST_HEAD(&qp_info->overflow_list);
2699 spin_lock_init(&qp_info->snoop_lock);
2700 qp_info->snoop_table = NULL;
2701 qp_info->snoop_table_size = 0;
2702 atomic_set(&qp_info->snoop_count, 0);
2703 }
2704
2705 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2706 enum ib_qp_type qp_type)
2707 {
2708 struct ib_qp_init_attr qp_init_attr;
2709 int ret;
2710
2711 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2712 qp_init_attr.send_cq = qp_info->port_priv->cq;
2713 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2714 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2715 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2716 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2717 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2718 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2719 qp_init_attr.qp_type = qp_type;
2720 qp_init_attr.port_num = qp_info->port_priv->port_num;
2721 qp_init_attr.qp_context = qp_info;
2722 qp_init_attr.event_handler = qp_event_handler;
2723 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2724 if (IS_ERR(qp_info->qp)) {
2725 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2726 get_spl_qp_index(qp_type));
2727 ret = PTR_ERR(qp_info->qp);
2728 goto error;
2729 }
2730 /* Use minimum queue sizes unless the CQ is resized */
2731 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2732 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2733 return 0;
2734
2735 error:
2736 return ret;
2737 }
2738
2739 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2740 {
2741 ib_destroy_qp(qp_info->qp);
2742 kfree(qp_info->snoop_table);
2743 }
2744
2745 /*
2746 * Open the port
2747 * Create the QP, PD, MR, and CQ if needed
2748 */
2749 static int ib_mad_port_open(struct ib_device *device,
2750 int port_num)
2751 {
2752 int ret, cq_size;
2753 struct ib_mad_port_private *port_priv;
2754 unsigned long flags;
2755 char name[sizeof "ib_mad123"];
2756
2757 /* Create new device info */
2758 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2759 if (!port_priv) {
2760 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2761 return -ENOMEM;
2762 }
2763
2764 port_priv->device = device;
2765 port_priv->port_num = port_num;
2766 spin_lock_init(&port_priv->reg_lock);
2767 INIT_LIST_HEAD(&port_priv->agent_list);
2768 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2769 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2770
2771 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2772 port_priv->cq = ib_create_cq(port_priv->device,
2773 ib_mad_thread_completion_handler,
2774 NULL, port_priv, cq_size, 0);
2775 if (IS_ERR(port_priv->cq)) {
2776 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2777 ret = PTR_ERR(port_priv->cq);
2778 goto error3;
2779 }
2780
2781 port_priv->pd = ib_alloc_pd(device);
2782 if (IS_ERR(port_priv->pd)) {
2783 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2784 ret = PTR_ERR(port_priv->pd);
2785 goto error4;
2786 }
2787
2788 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2789 if (IS_ERR(port_priv->mr)) {
2790 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2791 ret = PTR_ERR(port_priv->mr);
2792 goto error5;
2793 }
2794
2795 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2796 if (ret)
2797 goto error6;
2798 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2799 if (ret)
2800 goto error7;
2801
2802 snprintf(name, sizeof name, "ib_mad%d", port_num);
2803 port_priv->wq = create_singlethread_workqueue(name);
2804 if (!port_priv->wq) {
2805 ret = -ENOMEM;
2806 goto error8;
2807 }
2808 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2809
2810 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2811 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2812 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2813
2814 ret = ib_mad_port_start(port_priv);
2815 if (ret) {
2816 printk(KERN_ERR PFX "Couldn't start port\n");
2817 goto error9;
2818 }
2819
2820 return 0;
2821
2822 error9:
2823 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2824 list_del_init(&port_priv->port_list);
2825 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2826
2827 destroy_workqueue(port_priv->wq);
2828 error8:
2829 destroy_mad_qp(&port_priv->qp_info[1]);
2830 error7:
2831 destroy_mad_qp(&port_priv->qp_info[0]);
2832 error6:
2833 ib_dereg_mr(port_priv->mr);
2834 error5:
2835 ib_dealloc_pd(port_priv->pd);
2836 error4:
2837 ib_destroy_cq(port_priv->cq);
2838 cleanup_recv_queue(&port_priv->qp_info[1]);
2839 cleanup_recv_queue(&port_priv->qp_info[0]);
2840 error3:
2841 kfree(port_priv);
2842
2843 return ret;
2844 }
2845
2846 /*
2847 * Close the port
2848 * If there are no classes using the port, free the port
2849 * resources (CQ, MR, PD, QP) and remove the port's info structure
2850 */
2851 static int ib_mad_port_close(struct ib_device *device, int port_num)
2852 {
2853 struct ib_mad_port_private *port_priv;
2854 unsigned long flags;
2855
2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2857 port_priv = __ib_get_mad_port(device, port_num);
2858 if (port_priv == NULL) {
2859 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2860 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2861 return -ENODEV;
2862 }
2863 list_del_init(&port_priv->port_list);
2864 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2865
2866 destroy_workqueue(port_priv->wq);
2867 destroy_mad_qp(&port_priv->qp_info[1]);
2868 destroy_mad_qp(&port_priv->qp_info[0]);
2869 ib_dereg_mr(port_priv->mr);
2870 ib_dealloc_pd(port_priv->pd);
2871 ib_destroy_cq(port_priv->cq);
2872 cleanup_recv_queue(&port_priv->qp_info[1]);
2873 cleanup_recv_queue(&port_priv->qp_info[0]);
2874 /* XXX: Handle deallocation of MAD registration tables */
2875
2876 kfree(port_priv);
2877
2878 return 0;
2879 }
2880
2881 static void ib_mad_init_device(struct ib_device *device)
2882 {
2883 int start, end, i;
2884
2885 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2886 return;
2887
2888 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2889 start = 0;
2890 end = 0;
2891 } else {
2892 start = 1;
2893 end = device->phys_port_cnt;
2894 }
2895
2896 for (i = start; i <= end; i++) {
2897 if (ib_mad_port_open(device, i)) {
2898 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2899 device->name, i);
2900 goto error;
2901 }
2902 if (ib_agent_port_open(device, i)) {
2903 printk(KERN_ERR PFX "Couldn't open %s port %d "
2904 "for agents\n",
2905 device->name, i);
2906 goto error_agent;
2907 }
2908 }
2909 return;
2910
2911 error_agent:
2912 if (ib_mad_port_close(device, i))
2913 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2914 device->name, i);
2915
2916 error:
2917 i--;
2918
2919 while (i >= start) {
2920 if (ib_agent_port_close(device, i))
2921 printk(KERN_ERR PFX "Couldn't close %s port %d "
2922 "for agents\n",
2923 device->name, i);
2924 if (ib_mad_port_close(device, i))
2925 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2926 device->name, i);
2927 i--;
2928 }
2929 }
2930
2931 static void ib_mad_remove_device(struct ib_device *device)
2932 {
2933 int i, num_ports, cur_port;
2934
2935 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2936 num_ports = 1;
2937 cur_port = 0;
2938 } else {
2939 num_ports = device->phys_port_cnt;
2940 cur_port = 1;
2941 }
2942 for (i = 0; i < num_ports; i++, cur_port++) {
2943 if (ib_agent_port_close(device, cur_port))
2944 printk(KERN_ERR PFX "Couldn't close %s port %d "
2945 "for agents\n",
2946 device->name, cur_port);
2947 if (ib_mad_port_close(device, cur_port))
2948 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2949 device->name, cur_port);
2950 }
2951 }
2952
2953 static struct ib_client mad_client = {
2954 .name = "mad",
2955 .add = ib_mad_init_device,
2956 .remove = ib_mad_remove_device
2957 };
2958
2959 static int __init ib_mad_init_module(void)
2960 {
2961 int ret;
2962
2963 spin_lock_init(&ib_mad_port_list_lock);
2964
2965 ib_mad_cache = kmem_cache_create("ib_mad",
2966 sizeof(struct ib_mad_private),
2967 0,
2968 SLAB_HWCACHE_ALIGN,
2969 NULL,
2970 NULL);
2971 if (!ib_mad_cache) {
2972 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2973 ret = -ENOMEM;
2974 goto error1;
2975 }
2976
2977 INIT_LIST_HEAD(&ib_mad_port_list);
2978
2979 if (ib_register_client(&mad_client)) {
2980 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2981 ret = -EINVAL;
2982 goto error2;
2983 }
2984
2985 return 0;
2986
2987 error2:
2988 kmem_cache_destroy(ib_mad_cache);
2989 error1:
2990 return ret;
2991 }
2992
2993 static void __exit ib_mad_cleanup_module(void)
2994 {
2995 ib_unregister_client(&mad_client);
2996 kmem_cache_destroy(ib_mad_cache);
2997 }
2998
2999 module_init(ib_mad_init_module);
3000 module_exit(ib_mad_cleanup_module);
3001
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