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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 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 */
36#include <linux/dma-mapping.h>
37#include <linux/slab.h>
38#include <rdma/ib_cache.h>
39
40#include "mad_priv.h"
41#include "mad_rmpp.h"
42#include "smi.h"
43#include "agent.h"
44
45MODULE_LICENSE("Dual BSD/GPL");
46MODULE_DESCRIPTION("kernel IB MAD API");
47MODULE_AUTHOR("Hal Rosenstock");
48MODULE_AUTHOR("Sean Hefty");
49
50static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
51static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
52
53module_param_named(send_queue_size, mad_sendq_size, int, 0444);
54MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
55module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
56MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
57
58static struct kmem_cache *ib_mad_cache;
59
60static struct list_head ib_mad_port_list;
61static u32 ib_mad_client_id = 0;
62
63/* Port list lock */
64static DEFINE_SPINLOCK(ib_mad_port_list_lock);
65
66/* Forward declarations */
67static int method_in_use(struct ib_mad_mgmt_method_table **method,
68 struct ib_mad_reg_req *mad_reg_req);
69static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
70static struct ib_mad_agent_private *find_mad_agent(
71 struct ib_mad_port_private *port_priv,
72 struct ib_mad *mad);
73static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
74 struct ib_mad_private *mad);
75static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
76static void timeout_sends(struct work_struct *work);
77static void local_completions(struct work_struct *work);
78static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
79 struct ib_mad_agent_private *agent_priv,
80 u8 mgmt_class);
81static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
82 struct ib_mad_agent_private *agent_priv);
83
84/*
85 * Returns a ib_mad_port_private structure or NULL for a device/port
86 * Assumes ib_mad_port_list_lock is being held
87 */
88static inline struct ib_mad_port_private *
89__ib_get_mad_port(struct ib_device *device, int port_num)
90{
91 struct ib_mad_port_private *entry;
92
93 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
94 if (entry->device == device && entry->port_num == port_num)
95 return entry;
96 }
97 return NULL;
98}
99
100/*
101 * Wrapper function to return a ib_mad_port_private structure or NULL
102 * for a device/port
103 */
104static inline struct ib_mad_port_private *
105ib_get_mad_port(struct ib_device *device, int port_num)
106{
107 struct ib_mad_port_private *entry;
108 unsigned long flags;
109
110 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
111 entry = __ib_get_mad_port(device, port_num);
112 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
113
114 return entry;
115}
116
117static inline u8 convert_mgmt_class(u8 mgmt_class)
118{
119 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
120 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
121 0 : mgmt_class;
122}
123
124static int get_spl_qp_index(enum ib_qp_type qp_type)
125{
126 switch (qp_type)
127 {
128 case IB_QPT_SMI:
129 return 0;
130 case IB_QPT_GSI:
131 return 1;
132 default:
133 return -1;
134 }
135}
136
137static int vendor_class_index(u8 mgmt_class)
138{
139 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
140}
141
142static int is_vendor_class(u8 mgmt_class)
143{
144 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
145 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
146 return 0;
147 return 1;
148}
149
150static int is_vendor_oui(char *oui)
151{
152 if (oui[0] || oui[1] || oui[2])
153 return 1;
154 return 0;
155}
156
157static int is_vendor_method_in_use(
158 struct ib_mad_mgmt_vendor_class *vendor_class,
159 struct ib_mad_reg_req *mad_reg_req)
160{
161 struct ib_mad_mgmt_method_table *method;
162 int i;
163
164 for (i = 0; i < MAX_MGMT_OUI; i++) {
165 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
166 method = vendor_class->method_table[i];
167 if (method) {
168 if (method_in_use(&method, mad_reg_req))
169 return 1;
170 else
171 break;
172 }
173 }
174 }
175 return 0;
176}
177
178int ib_response_mad(struct ib_mad *mad)
179{
180 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
181 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
182 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
183 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
184}
185EXPORT_SYMBOL(ib_response_mad);
186
187/*
188 * ib_register_mad_agent - Register to send/receive MADs
189 */
190struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
191 u8 port_num,
192 enum ib_qp_type qp_type,
193 struct ib_mad_reg_req *mad_reg_req,
194 u8 rmpp_version,
195 ib_mad_send_handler send_handler,
196 ib_mad_recv_handler recv_handler,
197 void *context)
198{
199 struct ib_mad_port_private *port_priv;
200 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
201 struct ib_mad_agent_private *mad_agent_priv;
202 struct ib_mad_reg_req *reg_req = NULL;
203 struct ib_mad_mgmt_class_table *class;
204 struct ib_mad_mgmt_vendor_class_table *vendor;
205 struct ib_mad_mgmt_vendor_class *vendor_class;
206 struct ib_mad_mgmt_method_table *method;
207 int ret2, qpn;
208 unsigned long flags;
209 u8 mgmt_class, vclass;
210
211 /* Validate parameters */
212 qpn = get_spl_qp_index(qp_type);
213 if (qpn == -1)
214 goto error1;
215
216 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
217 goto error1;
218
219 /* Validate MAD registration request if supplied */
220 if (mad_reg_req) {
221 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
222 goto error1;
223 if (!recv_handler)
224 goto error1;
225 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
226 /*
227 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
228 * one in this range currently allowed
229 */
230 if (mad_reg_req->mgmt_class !=
231 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
232 goto error1;
233 } else if (mad_reg_req->mgmt_class == 0) {
234 /*
235 * Class 0 is reserved in IBA and is used for
236 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
237 */
238 goto error1;
239 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
240 /*
241 * If class is in "new" vendor range,
242 * ensure supplied OUI is not zero
243 */
244 if (!is_vendor_oui(mad_reg_req->oui))
245 goto error1;
246 }
247 /* Make sure class supplied is consistent with RMPP */
248 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
249 if (rmpp_version)
250 goto error1;
251 }
252 /* Make sure class supplied is consistent with QP type */
253 if (qp_type == IB_QPT_SMI) {
254 if ((mad_reg_req->mgmt_class !=
255 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
256 (mad_reg_req->mgmt_class !=
257 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
258 goto error1;
259 } else {
260 if ((mad_reg_req->mgmt_class ==
261 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
262 (mad_reg_req->mgmt_class ==
263 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
264 goto error1;
265 }
266 } else {
267 /* No registration request supplied */
268 if (!send_handler)
269 goto error1;
270 }
271
272 /* Validate device and port */
273 port_priv = ib_get_mad_port(device, port_num);
274 if (!port_priv) {
275 ret = ERR_PTR(-ENODEV);
276 goto error1;
277 }
278
279 /* Verify the QP requested is supported. For example, Ethernet devices
280 * will not have QP0 */
281 if (!port_priv->qp_info[qpn].qp) {
282 ret = ERR_PTR(-EPROTONOSUPPORT);
283 goto error1;
284 }
285
286 /* Allocate structures */
287 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
288 if (!mad_agent_priv) {
289 ret = ERR_PTR(-ENOMEM);
290 goto error1;
291 }
292
293 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
294 IB_ACCESS_LOCAL_WRITE);
295 if (IS_ERR(mad_agent_priv->agent.mr)) {
296 ret = ERR_PTR(-ENOMEM);
297 goto error2;
298 }
299
300 if (mad_reg_req) {
301 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
302 if (!reg_req) {
303 ret = ERR_PTR(-ENOMEM);
304 goto error3;
305 }
306 }
307
308 /* Now, fill in the various structures */
309 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
310 mad_agent_priv->reg_req = reg_req;
311 mad_agent_priv->agent.rmpp_version = rmpp_version;
312 mad_agent_priv->agent.device = device;
313 mad_agent_priv->agent.recv_handler = recv_handler;
314 mad_agent_priv->agent.send_handler = send_handler;
315 mad_agent_priv->agent.context = context;
316 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
317 mad_agent_priv->agent.port_num = port_num;
318 spin_lock_init(&mad_agent_priv->lock);
319 INIT_LIST_HEAD(&mad_agent_priv->send_list);
320 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
321 INIT_LIST_HEAD(&mad_agent_priv->done_list);
322 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
323 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
324 INIT_LIST_HEAD(&mad_agent_priv->local_list);
325 INIT_WORK(&mad_agent_priv->local_work, local_completions);
326 atomic_set(&mad_agent_priv->refcount, 1);
327 init_completion(&mad_agent_priv->comp);
328
329 spin_lock_irqsave(&port_priv->reg_lock, flags);
330 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
331
332 /*
333 * Make sure MAD registration (if supplied)
334 * is non overlapping with any existing ones
335 */
336 if (mad_reg_req) {
337 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
338 if (!is_vendor_class(mgmt_class)) {
339 class = port_priv->version[mad_reg_req->
340 mgmt_class_version].class;
341 if (class) {
342 method = class->method_table[mgmt_class];
343 if (method) {
344 if (method_in_use(&method,
345 mad_reg_req))
346 goto error4;
347 }
348 }
349 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
350 mgmt_class);
351 } else {
352 /* "New" vendor class range */
353 vendor = port_priv->version[mad_reg_req->
354 mgmt_class_version].vendor;
355 if (vendor) {
356 vclass = vendor_class_index(mgmt_class);
357 vendor_class = vendor->vendor_class[vclass];
358 if (vendor_class) {
359 if (is_vendor_method_in_use(
360 vendor_class,
361 mad_reg_req))
362 goto error4;
363 }
364 }
365 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
366 }
367 if (ret2) {
368 ret = ERR_PTR(ret2);
369 goto error4;
370 }
371 }
372
373 /* Add mad agent into port's agent list */
374 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
375 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
376
377 return &mad_agent_priv->agent;
378
379error4:
380 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
381 kfree(reg_req);
382error3:
383 ib_dereg_mr(mad_agent_priv->agent.mr);
384error2:
385 kfree(mad_agent_priv);
386error1:
387 return ret;
388}
389EXPORT_SYMBOL(ib_register_mad_agent);
390
391static inline int is_snooping_sends(int mad_snoop_flags)
392{
393 return (mad_snoop_flags &
394 (/*IB_MAD_SNOOP_POSTED_SENDS |
395 IB_MAD_SNOOP_RMPP_SENDS |*/
396 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
397 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
398}
399
400static inline int is_snooping_recvs(int mad_snoop_flags)
401{
402 return (mad_snoop_flags &
403 (IB_MAD_SNOOP_RECVS /*|
404 IB_MAD_SNOOP_RMPP_RECVS*/));
405}
406
407static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
408 struct ib_mad_snoop_private *mad_snoop_priv)
409{
410 struct ib_mad_snoop_private **new_snoop_table;
411 unsigned long flags;
412 int i;
413
414 spin_lock_irqsave(&qp_info->snoop_lock, flags);
415 /* Check for empty slot in array. */
416 for (i = 0; i < qp_info->snoop_table_size; i++)
417 if (!qp_info->snoop_table[i])
418 break;
419
420 if (i == qp_info->snoop_table_size) {
421 /* Grow table. */
422 new_snoop_table = krealloc(qp_info->snoop_table,
423 sizeof mad_snoop_priv *
424 (qp_info->snoop_table_size + 1),
425 GFP_ATOMIC);
426 if (!new_snoop_table) {
427 i = -ENOMEM;
428 goto out;
429 }
430
431 qp_info->snoop_table = new_snoop_table;
432 qp_info->snoop_table_size++;
433 }
434 qp_info->snoop_table[i] = mad_snoop_priv;
435 atomic_inc(&qp_info->snoop_count);
436out:
437 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
438 return i;
439}
440
441struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
442 u8 port_num,
443 enum ib_qp_type qp_type,
444 int mad_snoop_flags,
445 ib_mad_snoop_handler snoop_handler,
446 ib_mad_recv_handler recv_handler,
447 void *context)
448{
449 struct ib_mad_port_private *port_priv;
450 struct ib_mad_agent *ret;
451 struct ib_mad_snoop_private *mad_snoop_priv;
452 int qpn;
453
454 /* Validate parameters */
455 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
456 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
457 ret = ERR_PTR(-EINVAL);
458 goto error1;
459 }
460 qpn = get_spl_qp_index(qp_type);
461 if (qpn == -1) {
462 ret = ERR_PTR(-EINVAL);
463 goto error1;
464 }
465 port_priv = ib_get_mad_port(device, port_num);
466 if (!port_priv) {
467 ret = ERR_PTR(-ENODEV);
468 goto error1;
469 }
470 /* Allocate structures */
471 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
472 if (!mad_snoop_priv) {
473 ret = ERR_PTR(-ENOMEM);
474 goto error1;
475 }
476
477 /* Now, fill in the various structures */
478 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
479 mad_snoop_priv->agent.device = device;
480 mad_snoop_priv->agent.recv_handler = recv_handler;
481 mad_snoop_priv->agent.snoop_handler = snoop_handler;
482 mad_snoop_priv->agent.context = context;
483 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
484 mad_snoop_priv->agent.port_num = port_num;
485 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
486 init_completion(&mad_snoop_priv->comp);
487 mad_snoop_priv->snoop_index = register_snoop_agent(
488 &port_priv->qp_info[qpn],
489 mad_snoop_priv);
490 if (mad_snoop_priv->snoop_index < 0) {
491 ret = ERR_PTR(mad_snoop_priv->snoop_index);
492 goto error2;
493 }
494
495 atomic_set(&mad_snoop_priv->refcount, 1);
496 return &mad_snoop_priv->agent;
497
498error2:
499 kfree(mad_snoop_priv);
500error1:
501 return ret;
502}
503EXPORT_SYMBOL(ib_register_mad_snoop);
504
505static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
506{
507 if (atomic_dec_and_test(&mad_agent_priv->refcount))
508 complete(&mad_agent_priv->comp);
509}
510
511static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
512{
513 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
514 complete(&mad_snoop_priv->comp);
515}
516
517static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
518{
519 struct ib_mad_port_private *port_priv;
520 unsigned long flags;
521
522 /* Note that we could still be handling received MADs */
523
524 /*
525 * Canceling all sends results in dropping received response
526 * MADs, preventing us from queuing additional work
527 */
528 cancel_mads(mad_agent_priv);
529 port_priv = mad_agent_priv->qp_info->port_priv;
530 cancel_delayed_work(&mad_agent_priv->timed_work);
531
532 spin_lock_irqsave(&port_priv->reg_lock, flags);
533 remove_mad_reg_req(mad_agent_priv);
534 list_del(&mad_agent_priv->agent_list);
535 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
536
537 flush_workqueue(port_priv->wq);
538 ib_cancel_rmpp_recvs(mad_agent_priv);
539
540 deref_mad_agent(mad_agent_priv);
541 wait_for_completion(&mad_agent_priv->comp);
542
543 kfree(mad_agent_priv->reg_req);
544 ib_dereg_mr(mad_agent_priv->agent.mr);
545 kfree(mad_agent_priv);
546}
547
548static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
549{
550 struct ib_mad_qp_info *qp_info;
551 unsigned long flags;
552
553 qp_info = mad_snoop_priv->qp_info;
554 spin_lock_irqsave(&qp_info->snoop_lock, flags);
555 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
556 atomic_dec(&qp_info->snoop_count);
557 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
558
559 deref_snoop_agent(mad_snoop_priv);
560 wait_for_completion(&mad_snoop_priv->comp);
561
562 kfree(mad_snoop_priv);
563}
564
565/*
566 * ib_unregister_mad_agent - Unregisters a client from using MAD services
567 */
568int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
569{
570 struct ib_mad_agent_private *mad_agent_priv;
571 struct ib_mad_snoop_private *mad_snoop_priv;
572
573 /* If the TID is zero, the agent can only snoop. */
574 if (mad_agent->hi_tid) {
575 mad_agent_priv = container_of(mad_agent,
576 struct ib_mad_agent_private,
577 agent);
578 unregister_mad_agent(mad_agent_priv);
579 } else {
580 mad_snoop_priv = container_of(mad_agent,
581 struct ib_mad_snoop_private,
582 agent);
583 unregister_mad_snoop(mad_snoop_priv);
584 }
585 return 0;
586}
587EXPORT_SYMBOL(ib_unregister_mad_agent);
588
589static void dequeue_mad(struct ib_mad_list_head *mad_list)
590{
591 struct ib_mad_queue *mad_queue;
592 unsigned long flags;
593
594 BUG_ON(!mad_list->mad_queue);
595 mad_queue = mad_list->mad_queue;
596 spin_lock_irqsave(&mad_queue->lock, flags);
597 list_del(&mad_list->list);
598 mad_queue->count--;
599 spin_unlock_irqrestore(&mad_queue->lock, flags);
600}
601
602static void snoop_send(struct ib_mad_qp_info *qp_info,
603 struct ib_mad_send_buf *send_buf,
604 struct ib_mad_send_wc *mad_send_wc,
605 int mad_snoop_flags)
606{
607 struct ib_mad_snoop_private *mad_snoop_priv;
608 unsigned long flags;
609 int i;
610
611 spin_lock_irqsave(&qp_info->snoop_lock, flags);
612 for (i = 0; i < qp_info->snoop_table_size; i++) {
613 mad_snoop_priv = qp_info->snoop_table[i];
614 if (!mad_snoop_priv ||
615 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
616 continue;
617
618 atomic_inc(&mad_snoop_priv->refcount);
619 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
620 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
621 send_buf, mad_send_wc);
622 deref_snoop_agent(mad_snoop_priv);
623 spin_lock_irqsave(&qp_info->snoop_lock, flags);
624 }
625 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
626}
627
628static void snoop_recv(struct ib_mad_qp_info *qp_info,
629 struct ib_mad_recv_wc *mad_recv_wc,
630 int mad_snoop_flags)
631{
632 struct ib_mad_snoop_private *mad_snoop_priv;
633 unsigned long flags;
634 int i;
635
636 spin_lock_irqsave(&qp_info->snoop_lock, flags);
637 for (i = 0; i < qp_info->snoop_table_size; i++) {
638 mad_snoop_priv = qp_info->snoop_table[i];
639 if (!mad_snoop_priv ||
640 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
641 continue;
642
643 atomic_inc(&mad_snoop_priv->refcount);
644 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
645 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
646 mad_recv_wc);
647 deref_snoop_agent(mad_snoop_priv);
648 spin_lock_irqsave(&qp_info->snoop_lock, flags);
649 }
650 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
651}
652
653static void build_smp_wc(struct ib_qp *qp,
654 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
655 struct ib_wc *wc)
656{
657 memset(wc, 0, sizeof *wc);
658 wc->wr_id = wr_id;
659 wc->status = IB_WC_SUCCESS;
660 wc->opcode = IB_WC_RECV;
661 wc->pkey_index = pkey_index;
662 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
663 wc->src_qp = IB_QP0;
664 wc->qp = qp;
665 wc->slid = slid;
666 wc->sl = 0;
667 wc->dlid_path_bits = 0;
668 wc->port_num = port_num;
669}
670
671/*
672 * Return 0 if SMP is to be sent
673 * Return 1 if SMP was consumed locally (whether or not solicited)
674 * Return < 0 if error
675 */
676static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
677 struct ib_mad_send_wr_private *mad_send_wr)
678{
679 int ret = 0;
680 struct ib_smp *smp = mad_send_wr->send_buf.mad;
681 unsigned long flags;
682 struct ib_mad_local_private *local;
683 struct ib_mad_private *mad_priv;
684 struct ib_mad_port_private *port_priv;
685 struct ib_mad_agent_private *recv_mad_agent = NULL;
686 struct ib_device *device = mad_agent_priv->agent.device;
687 u8 port_num;
688 struct ib_wc mad_wc;
689 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
690
691 if (device->node_type == RDMA_NODE_IB_SWITCH &&
692 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
693 port_num = send_wr->wr.ud.port_num;
694 else
695 port_num = mad_agent_priv->agent.port_num;
696
697 /*
698 * Directed route handling starts if the initial LID routed part of
699 * a request or the ending LID routed part of a response is empty.
700 * If we are at the start of the LID routed part, don't update the
701 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
702 */
703 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
704 IB_LID_PERMISSIVE &&
705 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
706 IB_SMI_DISCARD) {
707 ret = -EINVAL;
708 printk(KERN_ERR PFX "Invalid directed route\n");
709 goto out;
710 }
711
712 /* Check to post send on QP or process locally */
713 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
714 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
715 goto out;
716
717 local = kmalloc(sizeof *local, GFP_ATOMIC);
718 if (!local) {
719 ret = -ENOMEM;
720 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
721 goto out;
722 }
723 local->mad_priv = NULL;
724 local->recv_mad_agent = NULL;
725 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
726 if (!mad_priv) {
727 ret = -ENOMEM;
728 printk(KERN_ERR PFX "No memory for local response MAD\n");
729 kfree(local);
730 goto out;
731 }
732
733 build_smp_wc(mad_agent_priv->agent.qp,
734 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
735 send_wr->wr.ud.pkey_index,
736 send_wr->wr.ud.port_num, &mad_wc);
737
738 /* No GRH for DR SMP */
739 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
740 (struct ib_mad *)smp,
741 (struct ib_mad *)&mad_priv->mad);
742 switch (ret)
743 {
744 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
745 if (ib_response_mad(&mad_priv->mad.mad) &&
746 mad_agent_priv->agent.recv_handler) {
747 local->mad_priv = mad_priv;
748 local->recv_mad_agent = mad_agent_priv;
749 /*
750 * Reference MAD agent until receive
751 * side of local completion handled
752 */
753 atomic_inc(&mad_agent_priv->refcount);
754 } else
755 kmem_cache_free(ib_mad_cache, mad_priv);
756 break;
757 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
758 kmem_cache_free(ib_mad_cache, mad_priv);
759 break;
760 case IB_MAD_RESULT_SUCCESS:
761 /* Treat like an incoming receive MAD */
762 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
763 mad_agent_priv->agent.port_num);
764 if (port_priv) {
765 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
766 recv_mad_agent = find_mad_agent(port_priv,
767 &mad_priv->mad.mad);
768 }
769 if (!port_priv || !recv_mad_agent) {
770 /*
771 * No receiving agent so drop packet and
772 * generate send completion.
773 */
774 kmem_cache_free(ib_mad_cache, mad_priv);
775 break;
776 }
777 local->mad_priv = mad_priv;
778 local->recv_mad_agent = recv_mad_agent;
779 break;
780 default:
781 kmem_cache_free(ib_mad_cache, mad_priv);
782 kfree(local);
783 ret = -EINVAL;
784 goto out;
785 }
786
787 local->mad_send_wr = mad_send_wr;
788 /* Reference MAD agent until send side of local completion handled */
789 atomic_inc(&mad_agent_priv->refcount);
790 /* Queue local completion to local list */
791 spin_lock_irqsave(&mad_agent_priv->lock, flags);
792 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
793 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
794 queue_work(mad_agent_priv->qp_info->port_priv->wq,
795 &mad_agent_priv->local_work);
796 ret = 1;
797out:
798 return ret;
799}
800
801static int get_pad_size(int hdr_len, int data_len)
802{
803 int seg_size, pad;
804
805 seg_size = sizeof(struct ib_mad) - hdr_len;
806 if (data_len && seg_size) {
807 pad = seg_size - data_len % seg_size;
808 return pad == seg_size ? 0 : pad;
809 } else
810 return seg_size;
811}
812
813static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
814{
815 struct ib_rmpp_segment *s, *t;
816
817 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
818 list_del(&s->list);
819 kfree(s);
820 }
821}
822
823static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
824 gfp_t gfp_mask)
825{
826 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
827 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
828 struct ib_rmpp_segment *seg = NULL;
829 int left, seg_size, pad;
830
831 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
832 seg_size = send_buf->seg_size;
833 pad = send_wr->pad;
834
835 /* Allocate data segments. */
836 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
837 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
838 if (!seg) {
839 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
840 "alloc failed for len %zd, gfp %#x\n",
841 sizeof (*seg) + seg_size, gfp_mask);
842 free_send_rmpp_list(send_wr);
843 return -ENOMEM;
844 }
845 seg->num = ++send_buf->seg_count;
846 list_add_tail(&seg->list, &send_wr->rmpp_list);
847 }
848
849 /* Zero any padding */
850 if (pad)
851 memset(seg->data + seg_size - pad, 0, pad);
852
853 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
854 agent.rmpp_version;
855 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
856 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
857
858 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
859 struct ib_rmpp_segment, list);
860 send_wr->last_ack_seg = send_wr->cur_seg;
861 return 0;
862}
863
864struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
865 u32 remote_qpn, u16 pkey_index,
866 int rmpp_active,
867 int hdr_len, int data_len,
868 gfp_t gfp_mask)
869{
870 struct ib_mad_agent_private *mad_agent_priv;
871 struct ib_mad_send_wr_private *mad_send_wr;
872 int pad, message_size, ret, size;
873 void *buf;
874
875 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
876 agent);
877 pad = get_pad_size(hdr_len, data_len);
878 message_size = hdr_len + data_len + pad;
879
880 if ((!mad_agent->rmpp_version &&
881 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
882 (!rmpp_active && message_size > sizeof(struct ib_mad)))
883 return ERR_PTR(-EINVAL);
884
885 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
886 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
887 if (!buf)
888 return ERR_PTR(-ENOMEM);
889
890 mad_send_wr = buf + size;
891 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
892 mad_send_wr->send_buf.mad = buf;
893 mad_send_wr->send_buf.hdr_len = hdr_len;
894 mad_send_wr->send_buf.data_len = data_len;
895 mad_send_wr->pad = pad;
896
897 mad_send_wr->mad_agent_priv = mad_agent_priv;
898 mad_send_wr->sg_list[0].length = hdr_len;
899 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
900 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
901 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
902
903 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
904 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
905 mad_send_wr->send_wr.num_sge = 2;
906 mad_send_wr->send_wr.opcode = IB_WR_SEND;
907 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
908 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
909 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
910 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
911
912 if (rmpp_active) {
913 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
914 if (ret) {
915 kfree(buf);
916 return ERR_PTR(ret);
917 }
918 }
919
920 mad_send_wr->send_buf.mad_agent = mad_agent;
921 atomic_inc(&mad_agent_priv->refcount);
922 return &mad_send_wr->send_buf;
923}
924EXPORT_SYMBOL(ib_create_send_mad);
925
926int ib_get_mad_data_offset(u8 mgmt_class)
927{
928 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
929 return IB_MGMT_SA_HDR;
930 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
931 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
932 (mgmt_class == IB_MGMT_CLASS_BIS))
933 return IB_MGMT_DEVICE_HDR;
934 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
935 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
936 return IB_MGMT_VENDOR_HDR;
937 else
938 return IB_MGMT_MAD_HDR;
939}
940EXPORT_SYMBOL(ib_get_mad_data_offset);
941
942int ib_is_mad_class_rmpp(u8 mgmt_class)
943{
944 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
945 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
946 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
947 (mgmt_class == IB_MGMT_CLASS_BIS) ||
948 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
949 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
950 return 1;
951 return 0;
952}
953EXPORT_SYMBOL(ib_is_mad_class_rmpp);
954
955void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
956{
957 struct ib_mad_send_wr_private *mad_send_wr;
958 struct list_head *list;
959
960 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
961 send_buf);
962 list = &mad_send_wr->cur_seg->list;
963
964 if (mad_send_wr->cur_seg->num < seg_num) {
965 list_for_each_entry(mad_send_wr->cur_seg, list, list)
966 if (mad_send_wr->cur_seg->num == seg_num)
967 break;
968 } else if (mad_send_wr->cur_seg->num > seg_num) {
969 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
970 if (mad_send_wr->cur_seg->num == seg_num)
971 break;
972 }
973 return mad_send_wr->cur_seg->data;
974}
975EXPORT_SYMBOL(ib_get_rmpp_segment);
976
977static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
978{
979 if (mad_send_wr->send_buf.seg_count)
980 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
981 mad_send_wr->seg_num);
982 else
983 return mad_send_wr->send_buf.mad +
984 mad_send_wr->send_buf.hdr_len;
985}
986
987void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
988{
989 struct ib_mad_agent_private *mad_agent_priv;
990 struct ib_mad_send_wr_private *mad_send_wr;
991
992 mad_agent_priv = container_of(send_buf->mad_agent,
993 struct ib_mad_agent_private, agent);
994 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
995 send_buf);
996
997 free_send_rmpp_list(mad_send_wr);
998 kfree(send_buf->mad);
999 deref_mad_agent(mad_agent_priv);
1000}
1001EXPORT_SYMBOL(ib_free_send_mad);
1002
1003int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1004{
1005 struct ib_mad_qp_info *qp_info;
1006 struct list_head *list;
1007 struct ib_send_wr *bad_send_wr;
1008 struct ib_mad_agent *mad_agent;
1009 struct ib_sge *sge;
1010 unsigned long flags;
1011 int ret;
1012
1013 /* Set WR ID to find mad_send_wr upon completion */
1014 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1015 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1016 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1017
1018 mad_agent = mad_send_wr->send_buf.mad_agent;
1019 sge = mad_send_wr->sg_list;
1020 sge[0].addr = ib_dma_map_single(mad_agent->device,
1021 mad_send_wr->send_buf.mad,
1022 sge[0].length,
1023 DMA_TO_DEVICE);
1024 mad_send_wr->header_mapping = sge[0].addr;
1025
1026 sge[1].addr = ib_dma_map_single(mad_agent->device,
1027 ib_get_payload(mad_send_wr),
1028 sge[1].length,
1029 DMA_TO_DEVICE);
1030 mad_send_wr->payload_mapping = sge[1].addr;
1031
1032 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1033 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1034 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1035 &bad_send_wr);
1036 list = &qp_info->send_queue.list;
1037 } else {
1038 ret = 0;
1039 list = &qp_info->overflow_list;
1040 }
1041
1042 if (!ret) {
1043 qp_info->send_queue.count++;
1044 list_add_tail(&mad_send_wr->mad_list.list, list);
1045 }
1046 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1047 if (ret) {
1048 ib_dma_unmap_single(mad_agent->device,
1049 mad_send_wr->header_mapping,
1050 sge[0].length, DMA_TO_DEVICE);
1051 ib_dma_unmap_single(mad_agent->device,
1052 mad_send_wr->payload_mapping,
1053 sge[1].length, DMA_TO_DEVICE);
1054 }
1055 return ret;
1056}
1057
1058/*
1059 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1060 * with the registered client
1061 */
1062int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1063 struct ib_mad_send_buf **bad_send_buf)
1064{
1065 struct ib_mad_agent_private *mad_agent_priv;
1066 struct ib_mad_send_buf *next_send_buf;
1067 struct ib_mad_send_wr_private *mad_send_wr;
1068 unsigned long flags;
1069 int ret = -EINVAL;
1070
1071 /* Walk list of send WRs and post each on send list */
1072 for (; send_buf; send_buf = next_send_buf) {
1073
1074 mad_send_wr = container_of(send_buf,
1075 struct ib_mad_send_wr_private,
1076 send_buf);
1077 mad_agent_priv = mad_send_wr->mad_agent_priv;
1078
1079 if (!send_buf->mad_agent->send_handler ||
1080 (send_buf->timeout_ms &&
1081 !send_buf->mad_agent->recv_handler)) {
1082 ret = -EINVAL;
1083 goto error;
1084 }
1085
1086 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1087 if (mad_agent_priv->agent.rmpp_version) {
1088 ret = -EINVAL;
1089 goto error;
1090 }
1091 }
1092
1093 /*
1094 * Save pointer to next work request to post in case the
1095 * current one completes, and the user modifies the work
1096 * request associated with the completion
1097 */
1098 next_send_buf = send_buf->next;
1099 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1100
1101 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1102 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1103 ret = handle_outgoing_dr_smp(mad_agent_priv,
1104 mad_send_wr);
1105 if (ret < 0) /* error */
1106 goto error;
1107 else if (ret == 1) /* locally consumed */
1108 continue;
1109 }
1110
1111 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1112 /* Timeout will be updated after send completes */
1113 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1114 mad_send_wr->max_retries = send_buf->retries;
1115 mad_send_wr->retries_left = send_buf->retries;
1116 send_buf->retries = 0;
1117 /* Reference for work request to QP + response */
1118 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1119 mad_send_wr->status = IB_WC_SUCCESS;
1120
1121 /* Reference MAD agent until send completes */
1122 atomic_inc(&mad_agent_priv->refcount);
1123 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1124 list_add_tail(&mad_send_wr->agent_list,
1125 &mad_agent_priv->send_list);
1126 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1127
1128 if (mad_agent_priv->agent.rmpp_version) {
1129 ret = ib_send_rmpp_mad(mad_send_wr);
1130 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1131 ret = ib_send_mad(mad_send_wr);
1132 } else
1133 ret = ib_send_mad(mad_send_wr);
1134 if (ret < 0) {
1135 /* Fail send request */
1136 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1137 list_del(&mad_send_wr->agent_list);
1138 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1139 atomic_dec(&mad_agent_priv->refcount);
1140 goto error;
1141 }
1142 }
1143 return 0;
1144error:
1145 if (bad_send_buf)
1146 *bad_send_buf = send_buf;
1147 return ret;
1148}
1149EXPORT_SYMBOL(ib_post_send_mad);
1150
1151/*
1152 * ib_free_recv_mad - Returns data buffers used to receive
1153 * a MAD to the access layer
1154 */
1155void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1156{
1157 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1158 struct ib_mad_private_header *mad_priv_hdr;
1159 struct ib_mad_private *priv;
1160 struct list_head free_list;
1161
1162 INIT_LIST_HEAD(&free_list);
1163 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1164
1165 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1166 &free_list, list) {
1167 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1168 recv_buf);
1169 mad_priv_hdr = container_of(mad_recv_wc,
1170 struct ib_mad_private_header,
1171 recv_wc);
1172 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1173 header);
1174 kmem_cache_free(ib_mad_cache, priv);
1175 }
1176}
1177EXPORT_SYMBOL(ib_free_recv_mad);
1178
1179struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1180 u8 rmpp_version,
1181 ib_mad_send_handler send_handler,
1182 ib_mad_recv_handler recv_handler,
1183 void *context)
1184{
1185 return ERR_PTR(-EINVAL); /* XXX: for now */
1186}
1187EXPORT_SYMBOL(ib_redirect_mad_qp);
1188
1189int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1190 struct ib_wc *wc)
1191{
1192 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1193 return 0;
1194}
1195EXPORT_SYMBOL(ib_process_mad_wc);
1196
1197static int method_in_use(struct ib_mad_mgmt_method_table **method,
1198 struct ib_mad_reg_req *mad_reg_req)
1199{
1200 int i;
1201
1202 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1203 if ((*method)->agent[i]) {
1204 printk(KERN_ERR PFX "Method %d already in use\n", i);
1205 return -EINVAL;
1206 }
1207 }
1208 return 0;
1209}
1210
1211static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1212{
1213 /* Allocate management method table */
1214 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1215 if (!*method) {
1216 printk(KERN_ERR PFX "No memory for "
1217 "ib_mad_mgmt_method_table\n");
1218 return -ENOMEM;
1219 }
1220
1221 return 0;
1222}
1223
1224/*
1225 * Check to see if there are any methods still in use
1226 */
1227static int check_method_table(struct ib_mad_mgmt_method_table *method)
1228{
1229 int i;
1230
1231 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1232 if (method->agent[i])
1233 return 1;
1234 return 0;
1235}
1236
1237/*
1238 * Check to see if there are any method tables for this class still in use
1239 */
1240static int check_class_table(struct ib_mad_mgmt_class_table *class)
1241{
1242 int i;
1243
1244 for (i = 0; i < MAX_MGMT_CLASS; i++)
1245 if (class->method_table[i])
1246 return 1;
1247 return 0;
1248}
1249
1250static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1251{
1252 int i;
1253
1254 for (i = 0; i < MAX_MGMT_OUI; i++)
1255 if (vendor_class->method_table[i])
1256 return 1;
1257 return 0;
1258}
1259
1260static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1261 char *oui)
1262{
1263 int i;
1264
1265 for (i = 0; i < MAX_MGMT_OUI; i++)
1266 /* Is there matching OUI for this vendor class ? */
1267 if (!memcmp(vendor_class->oui[i], oui, 3))
1268 return i;
1269
1270 return -1;
1271}
1272
1273static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1274{
1275 int i;
1276
1277 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1278 if (vendor->vendor_class[i])
1279 return 1;
1280
1281 return 0;
1282}
1283
1284static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1285 struct ib_mad_agent_private *agent)
1286{
1287 int i;
1288
1289 /* Remove any methods for this mad agent */
1290 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1291 if (method->agent[i] == agent) {
1292 method->agent[i] = NULL;
1293 }
1294 }
1295}
1296
1297static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1298 struct ib_mad_agent_private *agent_priv,
1299 u8 mgmt_class)
1300{
1301 struct ib_mad_port_private *port_priv;
1302 struct ib_mad_mgmt_class_table **class;
1303 struct ib_mad_mgmt_method_table **method;
1304 int i, ret;
1305
1306 port_priv = agent_priv->qp_info->port_priv;
1307 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1308 if (!*class) {
1309 /* Allocate management class table for "new" class version */
1310 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1311 if (!*class) {
1312 printk(KERN_ERR PFX "No memory for "
1313 "ib_mad_mgmt_class_table\n");
1314 ret = -ENOMEM;
1315 goto error1;
1316 }
1317
1318 /* Allocate method table for this management class */
1319 method = &(*class)->method_table[mgmt_class];
1320 if ((ret = allocate_method_table(method)))
1321 goto error2;
1322 } else {
1323 method = &(*class)->method_table[mgmt_class];
1324 if (!*method) {
1325 /* Allocate method table for this management class */
1326 if ((ret = allocate_method_table(method)))
1327 goto error1;
1328 }
1329 }
1330
1331 /* Now, make sure methods are not already in use */
1332 if (method_in_use(method, mad_reg_req))
1333 goto error3;
1334
1335 /* Finally, add in methods being registered */
1336 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1337 (*method)->agent[i] = agent_priv;
1338
1339 return 0;
1340
1341error3:
1342 /* Remove any methods for this mad agent */
1343 remove_methods_mad_agent(*method, agent_priv);
1344 /* Now, check to see if there are any methods in use */
1345 if (!check_method_table(*method)) {
1346 /* If not, release management method table */
1347 kfree(*method);
1348 *method = NULL;
1349 }
1350 ret = -EINVAL;
1351 goto error1;
1352error2:
1353 kfree(*class);
1354 *class = NULL;
1355error1:
1356 return ret;
1357}
1358
1359static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1360 struct ib_mad_agent_private *agent_priv)
1361{
1362 struct ib_mad_port_private *port_priv;
1363 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1364 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1365 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1366 struct ib_mad_mgmt_method_table **method;
1367 int i, ret = -ENOMEM;
1368 u8 vclass;
1369
1370 /* "New" vendor (with OUI) class */
1371 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1372 port_priv = agent_priv->qp_info->port_priv;
1373 vendor_table = &port_priv->version[
1374 mad_reg_req->mgmt_class_version].vendor;
1375 if (!*vendor_table) {
1376 /* Allocate mgmt vendor class table for "new" class version */
1377 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1378 if (!vendor) {
1379 printk(KERN_ERR PFX "No memory for "
1380 "ib_mad_mgmt_vendor_class_table\n");
1381 goto error1;
1382 }
1383
1384 *vendor_table = vendor;
1385 }
1386 if (!(*vendor_table)->vendor_class[vclass]) {
1387 /* Allocate table for this management vendor class */
1388 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1389 if (!vendor_class) {
1390 printk(KERN_ERR PFX "No memory for "
1391 "ib_mad_mgmt_vendor_class\n");
1392 goto error2;
1393 }
1394
1395 (*vendor_table)->vendor_class[vclass] = vendor_class;
1396 }
1397 for (i = 0; i < MAX_MGMT_OUI; i++) {
1398 /* Is there matching OUI for this vendor class ? */
1399 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1400 mad_reg_req->oui, 3)) {
1401 method = &(*vendor_table)->vendor_class[
1402 vclass]->method_table[i];
1403 BUG_ON(!*method);
1404 goto check_in_use;
1405 }
1406 }
1407 for (i = 0; i < MAX_MGMT_OUI; i++) {
1408 /* OUI slot available ? */
1409 if (!is_vendor_oui((*vendor_table)->vendor_class[
1410 vclass]->oui[i])) {
1411 method = &(*vendor_table)->vendor_class[
1412 vclass]->method_table[i];
1413 BUG_ON(*method);
1414 /* Allocate method table for this OUI */
1415 if ((ret = allocate_method_table(method)))
1416 goto error3;
1417 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1418 mad_reg_req->oui, 3);
1419 goto check_in_use;
1420 }
1421 }
1422 printk(KERN_ERR PFX "All OUI slots in use\n");
1423 goto error3;
1424
1425check_in_use:
1426 /* Now, make sure methods are not already in use */
1427 if (method_in_use(method, mad_reg_req))
1428 goto error4;
1429
1430 /* Finally, add in methods being registered */
1431 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1432 (*method)->agent[i] = agent_priv;
1433
1434 return 0;
1435
1436error4:
1437 /* Remove any methods for this mad agent */
1438 remove_methods_mad_agent(*method, agent_priv);
1439 /* Now, check to see if there are any methods in use */
1440 if (!check_method_table(*method)) {
1441 /* If not, release management method table */
1442 kfree(*method);
1443 *method = NULL;
1444 }
1445 ret = -EINVAL;
1446error3:
1447 if (vendor_class) {
1448 (*vendor_table)->vendor_class[vclass] = NULL;
1449 kfree(vendor_class);
1450 }
1451error2:
1452 if (vendor) {
1453 *vendor_table = NULL;
1454 kfree(vendor);
1455 }
1456error1:
1457 return ret;
1458}
1459
1460static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1461{
1462 struct ib_mad_port_private *port_priv;
1463 struct ib_mad_mgmt_class_table *class;
1464 struct ib_mad_mgmt_method_table *method;
1465 struct ib_mad_mgmt_vendor_class_table *vendor;
1466 struct ib_mad_mgmt_vendor_class *vendor_class;
1467 int index;
1468 u8 mgmt_class;
1469
1470 /*
1471 * Was MAD registration request supplied
1472 * with original registration ?
1473 */
1474 if (!agent_priv->reg_req) {
1475 goto out;
1476 }
1477
1478 port_priv = agent_priv->qp_info->port_priv;
1479 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1480 class = port_priv->version[
1481 agent_priv->reg_req->mgmt_class_version].class;
1482 if (!class)
1483 goto vendor_check;
1484
1485 method = class->method_table[mgmt_class];
1486 if (method) {
1487 /* Remove any methods for this mad agent */
1488 remove_methods_mad_agent(method, agent_priv);
1489 /* Now, check to see if there are any methods still in use */
1490 if (!check_method_table(method)) {
1491 /* If not, release management method table */
1492 kfree(method);
1493 class->method_table[mgmt_class] = NULL;
1494 /* Any management classes left ? */
1495 if (!check_class_table(class)) {
1496 /* If not, release management class table */
1497 kfree(class);
1498 port_priv->version[
1499 agent_priv->reg_req->
1500 mgmt_class_version].class = NULL;
1501 }
1502 }
1503 }
1504
1505vendor_check:
1506 if (!is_vendor_class(mgmt_class))
1507 goto out;
1508
1509 /* normalize mgmt_class to vendor range 2 */
1510 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1511 vendor = port_priv->version[
1512 agent_priv->reg_req->mgmt_class_version].vendor;
1513
1514 if (!vendor)
1515 goto out;
1516
1517 vendor_class = vendor->vendor_class[mgmt_class];
1518 if (vendor_class) {
1519 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1520 if (index < 0)
1521 goto out;
1522 method = vendor_class->method_table[index];
1523 if (method) {
1524 /* Remove any methods for this mad agent */
1525 remove_methods_mad_agent(method, agent_priv);
1526 /*
1527 * Now, check to see if there are
1528 * any methods still in use
1529 */
1530 if (!check_method_table(method)) {
1531 /* If not, release management method table */
1532 kfree(method);
1533 vendor_class->method_table[index] = NULL;
1534 memset(vendor_class->oui[index], 0, 3);
1535 /* Any OUIs left ? */
1536 if (!check_vendor_class(vendor_class)) {
1537 /* If not, release vendor class table */
1538 kfree(vendor_class);
1539 vendor->vendor_class[mgmt_class] = NULL;
1540 /* Any other vendor classes left ? */
1541 if (!check_vendor_table(vendor)) {
1542 kfree(vendor);
1543 port_priv->version[
1544 agent_priv->reg_req->
1545 mgmt_class_version].
1546 vendor = NULL;
1547 }
1548 }
1549 }
1550 }
1551 }
1552
1553out:
1554 return;
1555}
1556
1557static struct ib_mad_agent_private *
1558find_mad_agent(struct ib_mad_port_private *port_priv,
1559 struct ib_mad *mad)
1560{
1561 struct ib_mad_agent_private *mad_agent = NULL;
1562 unsigned long flags;
1563
1564 spin_lock_irqsave(&port_priv->reg_lock, flags);
1565 if (ib_response_mad(mad)) {
1566 u32 hi_tid;
1567 struct ib_mad_agent_private *entry;
1568
1569 /*
1570 * Routing is based on high 32 bits of transaction ID
1571 * of MAD.
1572 */
1573 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1574 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1575 if (entry->agent.hi_tid == hi_tid) {
1576 mad_agent = entry;
1577 break;
1578 }
1579 }
1580 } else {
1581 struct ib_mad_mgmt_class_table *class;
1582 struct ib_mad_mgmt_method_table *method;
1583 struct ib_mad_mgmt_vendor_class_table *vendor;
1584 struct ib_mad_mgmt_vendor_class *vendor_class;
1585 struct ib_vendor_mad *vendor_mad;
1586 int index;
1587
1588 /*
1589 * Routing is based on version, class, and method
1590 * For "newer" vendor MADs, also based on OUI
1591 */
1592 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1593 goto out;
1594 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1595 class = port_priv->version[
1596 mad->mad_hdr.class_version].class;
1597 if (!class)
1598 goto out;
1599 method = class->method_table[convert_mgmt_class(
1600 mad->mad_hdr.mgmt_class)];
1601 if (method)
1602 mad_agent = method->agent[mad->mad_hdr.method &
1603 ~IB_MGMT_METHOD_RESP];
1604 } else {
1605 vendor = port_priv->version[
1606 mad->mad_hdr.class_version].vendor;
1607 if (!vendor)
1608 goto out;
1609 vendor_class = vendor->vendor_class[vendor_class_index(
1610 mad->mad_hdr.mgmt_class)];
1611 if (!vendor_class)
1612 goto out;
1613 /* Find matching OUI */
1614 vendor_mad = (struct ib_vendor_mad *)mad;
1615 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1616 if (index == -1)
1617 goto out;
1618 method = vendor_class->method_table[index];
1619 if (method) {
1620 mad_agent = method->agent[mad->mad_hdr.method &
1621 ~IB_MGMT_METHOD_RESP];
1622 }
1623 }
1624 }
1625
1626 if (mad_agent) {
1627 if (mad_agent->agent.recv_handler)
1628 atomic_inc(&mad_agent->refcount);
1629 else {
1630 printk(KERN_NOTICE PFX "No receive handler for client "
1631 "%p on port %d\n",
1632 &mad_agent->agent, port_priv->port_num);
1633 mad_agent = NULL;
1634 }
1635 }
1636out:
1637 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1638
1639 return mad_agent;
1640}
1641
1642static int validate_mad(struct ib_mad *mad, u32 qp_num)
1643{
1644 int valid = 0;
1645
1646 /* Make sure MAD base version is understood */
1647 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1648 printk(KERN_ERR PFX "MAD received with unsupported base "
1649 "version %d\n", mad->mad_hdr.base_version);
1650 goto out;
1651 }
1652
1653 /* Filter SMI packets sent to other than QP0 */
1654 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1655 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1656 if (qp_num == 0)
1657 valid = 1;
1658 } else {
1659 /* Filter GSI packets sent to QP0 */
1660 if (qp_num != 0)
1661 valid = 1;
1662 }
1663
1664out:
1665 return valid;
1666}
1667
1668static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1669 struct ib_mad_hdr *mad_hdr)
1670{
1671 struct ib_rmpp_mad *rmpp_mad;
1672
1673 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1674 return !mad_agent_priv->agent.rmpp_version ||
1675 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1676 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1677 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1678}
1679
1680static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1681 struct ib_mad_recv_wc *rwc)
1682{
1683 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1684 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1685}
1686
1687static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1688 struct ib_mad_send_wr_private *wr,
1689 struct ib_mad_recv_wc *rwc )
1690{
1691 struct ib_ah_attr attr;
1692 u8 send_resp, rcv_resp;
1693 union ib_gid sgid;
1694 struct ib_device *device = mad_agent_priv->agent.device;
1695 u8 port_num = mad_agent_priv->agent.port_num;
1696 u8 lmc;
1697
1698 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1699 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1700
1701 if (send_resp == rcv_resp)
1702 /* both requests, or both responses. GIDs different */
1703 return 0;
1704
1705 if (ib_query_ah(wr->send_buf.ah, &attr))
1706 /* Assume not equal, to avoid false positives. */
1707 return 0;
1708
1709 if (!!(attr.ah_flags & IB_AH_GRH) !=
1710 !!(rwc->wc->wc_flags & IB_WC_GRH))
1711 /* one has GID, other does not. Assume different */
1712 return 0;
1713
1714 if (!send_resp && rcv_resp) {
1715 /* is request/response. */
1716 if (!(attr.ah_flags & IB_AH_GRH)) {
1717 if (ib_get_cached_lmc(device, port_num, &lmc))
1718 return 0;
1719 return (!lmc || !((attr.src_path_bits ^
1720 rwc->wc->dlid_path_bits) &
1721 ((1 << lmc) - 1)));
1722 } else {
1723 if (ib_get_cached_gid(device, port_num,
1724 attr.grh.sgid_index, &sgid))
1725 return 0;
1726 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1727 16);
1728 }
1729 }
1730
1731 if (!(attr.ah_flags & IB_AH_GRH))
1732 return attr.dlid == rwc->wc->slid;
1733 else
1734 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1735 16);
1736}
1737
1738static inline int is_direct(u8 class)
1739{
1740 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1741}
1742
1743struct ib_mad_send_wr_private*
1744ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1745 struct ib_mad_recv_wc *wc)
1746{
1747 struct ib_mad_send_wr_private *wr;
1748 struct ib_mad *mad;
1749
1750 mad = (struct ib_mad *)wc->recv_buf.mad;
1751
1752 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1753 if ((wr->tid == mad->mad_hdr.tid) &&
1754 rcv_has_same_class(wr, wc) &&
1755 /*
1756 * Don't check GID for direct routed MADs.
1757 * These might have permissive LIDs.
1758 */
1759 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1760 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1761 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1762 }
1763
1764 /*
1765 * It's possible to receive the response before we've
1766 * been notified that the send has completed
1767 */
1768 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1769 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1770 wr->tid == mad->mad_hdr.tid &&
1771 wr->timeout &&
1772 rcv_has_same_class(wr, wc) &&
1773 /*
1774 * Don't check GID for direct routed MADs.
1775 * These might have permissive LIDs.
1776 */
1777 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1778 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1779 /* Verify request has not been canceled */
1780 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1781 }
1782 return NULL;
1783}
1784
1785void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1786{
1787 mad_send_wr->timeout = 0;
1788 if (mad_send_wr->refcount == 1)
1789 list_move_tail(&mad_send_wr->agent_list,
1790 &mad_send_wr->mad_agent_priv->done_list);
1791}
1792
1793static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1794 struct ib_mad_recv_wc *mad_recv_wc)
1795{
1796 struct ib_mad_send_wr_private *mad_send_wr;
1797 struct ib_mad_send_wc mad_send_wc;
1798 unsigned long flags;
1799
1800 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1801 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1802 if (mad_agent_priv->agent.rmpp_version) {
1803 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1804 mad_recv_wc);
1805 if (!mad_recv_wc) {
1806 deref_mad_agent(mad_agent_priv);
1807 return;
1808 }
1809 }
1810
1811 /* Complete corresponding request */
1812 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1813 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1814 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1815 if (!mad_send_wr) {
1816 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1817 ib_free_recv_mad(mad_recv_wc);
1818 deref_mad_agent(mad_agent_priv);
1819 return;
1820 }
1821 ib_mark_mad_done(mad_send_wr);
1822 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1823
1824 /* Defined behavior is to complete response before request */
1825 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1826 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1827 mad_recv_wc);
1828 atomic_dec(&mad_agent_priv->refcount);
1829
1830 mad_send_wc.status = IB_WC_SUCCESS;
1831 mad_send_wc.vendor_err = 0;
1832 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1833 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1834 } else {
1835 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1836 mad_recv_wc);
1837 deref_mad_agent(mad_agent_priv);
1838 }
1839}
1840
1841static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1842 struct ib_wc *wc)
1843{
1844 struct ib_mad_qp_info *qp_info;
1845 struct ib_mad_private_header *mad_priv_hdr;
1846 struct ib_mad_private *recv, *response = NULL;
1847 struct ib_mad_list_head *mad_list;
1848 struct ib_mad_agent_private *mad_agent;
1849 int port_num;
1850
1851 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1852 qp_info = mad_list->mad_queue->qp_info;
1853 dequeue_mad(mad_list);
1854
1855 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1856 mad_list);
1857 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1858 ib_dma_unmap_single(port_priv->device,
1859 recv->header.mapping,
1860 sizeof(struct ib_mad_private) -
1861 sizeof(struct ib_mad_private_header),
1862 DMA_FROM_DEVICE);
1863
1864 /* Setup MAD receive work completion from "normal" work completion */
1865 recv->header.wc = *wc;
1866 recv->header.recv_wc.wc = &recv->header.wc;
1867 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1868 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1869 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1870
1871 if (atomic_read(&qp_info->snoop_count))
1872 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1873
1874 /* Validate MAD */
1875 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1876 goto out;
1877
1878 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1879 if (!response) {
1880 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1881 "for response buffer\n");
1882 goto out;
1883 }
1884
1885 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1886 port_num = wc->port_num;
1887 else
1888 port_num = port_priv->port_num;
1889
1890 if (recv->mad.mad.mad_hdr.mgmt_class ==
1891 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1892 enum smi_forward_action retsmi;
1893
1894 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1895 port_priv->device->node_type,
1896 port_num,
1897 port_priv->device->phys_port_cnt) ==
1898 IB_SMI_DISCARD)
1899 goto out;
1900
1901 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1902 if (retsmi == IB_SMI_LOCAL)
1903 goto local;
1904
1905 if (retsmi == IB_SMI_SEND) { /* don't forward */
1906 if (smi_handle_dr_smp_send(&recv->mad.smp,
1907 port_priv->device->node_type,
1908 port_num) == IB_SMI_DISCARD)
1909 goto out;
1910
1911 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1912 goto out;
1913 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1914 /* forward case for switches */
1915 memcpy(response, recv, sizeof(*response));
1916 response->header.recv_wc.wc = &response->header.wc;
1917 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1918 response->header.recv_wc.recv_buf.grh = &response->grh;
1919
1920 agent_send_response(&response->mad.mad,
1921 &response->grh, wc,
1922 port_priv->device,
1923 smi_get_fwd_port(&recv->mad.smp),
1924 qp_info->qp->qp_num);
1925
1926 goto out;
1927 }
1928 }
1929
1930local:
1931 /* Give driver "right of first refusal" on incoming MAD */
1932 if (port_priv->device->process_mad) {
1933 int ret;
1934
1935 ret = port_priv->device->process_mad(port_priv->device, 0,
1936 port_priv->port_num,
1937 wc, &recv->grh,
1938 &recv->mad.mad,
1939 &response->mad.mad);
1940 if (ret & IB_MAD_RESULT_SUCCESS) {
1941 if (ret & IB_MAD_RESULT_CONSUMED)
1942 goto out;
1943 if (ret & IB_MAD_RESULT_REPLY) {
1944 agent_send_response(&response->mad.mad,
1945 &recv->grh, wc,
1946 port_priv->device,
1947 port_num,
1948 qp_info->qp->qp_num);
1949 goto out;
1950 }
1951 }
1952 }
1953
1954 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1955 if (mad_agent) {
1956 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1957 /*
1958 * recv is freed up in error cases in ib_mad_complete_recv
1959 * or via recv_handler in ib_mad_complete_recv()
1960 */
1961 recv = NULL;
1962 }
1963
1964out:
1965 /* Post another receive request for this QP */
1966 if (response) {
1967 ib_mad_post_receive_mads(qp_info, response);
1968 if (recv)
1969 kmem_cache_free(ib_mad_cache, recv);
1970 } else
1971 ib_mad_post_receive_mads(qp_info, recv);
1972}
1973
1974static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1975{
1976 struct ib_mad_send_wr_private *mad_send_wr;
1977 unsigned long delay;
1978
1979 if (list_empty(&mad_agent_priv->wait_list)) {
1980 __cancel_delayed_work(&mad_agent_priv->timed_work);
1981 } else {
1982 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1983 struct ib_mad_send_wr_private,
1984 agent_list);
1985
1986 if (time_after(mad_agent_priv->timeout,
1987 mad_send_wr->timeout)) {
1988 mad_agent_priv->timeout = mad_send_wr->timeout;
1989 __cancel_delayed_work(&mad_agent_priv->timed_work);
1990 delay = mad_send_wr->timeout - jiffies;
1991 if ((long)delay <= 0)
1992 delay = 1;
1993 queue_delayed_work(mad_agent_priv->qp_info->
1994 port_priv->wq,
1995 &mad_agent_priv->timed_work, delay);
1996 }
1997 }
1998}
1999
2000static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2001{
2002 struct ib_mad_agent_private *mad_agent_priv;
2003 struct ib_mad_send_wr_private *temp_mad_send_wr;
2004 struct list_head *list_item;
2005 unsigned long delay;
2006
2007 mad_agent_priv = mad_send_wr->mad_agent_priv;
2008 list_del(&mad_send_wr->agent_list);
2009
2010 delay = mad_send_wr->timeout;
2011 mad_send_wr->timeout += jiffies;
2012
2013 if (delay) {
2014 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2015 temp_mad_send_wr = list_entry(list_item,
2016 struct ib_mad_send_wr_private,
2017 agent_list);
2018 if (time_after(mad_send_wr->timeout,
2019 temp_mad_send_wr->timeout))
2020 break;
2021 }
2022 }
2023 else
2024 list_item = &mad_agent_priv->wait_list;
2025 list_add(&mad_send_wr->agent_list, list_item);
2026
2027 /* Reschedule a work item if we have a shorter timeout */
2028 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2029 __cancel_delayed_work(&mad_agent_priv->timed_work);
2030 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2031 &mad_agent_priv->timed_work, delay);
2032 }
2033}
2034
2035void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2036 int timeout_ms)
2037{
2038 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2039 wait_for_response(mad_send_wr);
2040}
2041
2042/*
2043 * Process a send work completion
2044 */
2045void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2046 struct ib_mad_send_wc *mad_send_wc)
2047{
2048 struct ib_mad_agent_private *mad_agent_priv;
2049 unsigned long flags;
2050 int ret;
2051
2052 mad_agent_priv = mad_send_wr->mad_agent_priv;
2053 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2054 if (mad_agent_priv->agent.rmpp_version) {
2055 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2056 if (ret == IB_RMPP_RESULT_CONSUMED)
2057 goto done;
2058 } else
2059 ret = IB_RMPP_RESULT_UNHANDLED;
2060
2061 if (mad_send_wc->status != IB_WC_SUCCESS &&
2062 mad_send_wr->status == IB_WC_SUCCESS) {
2063 mad_send_wr->status = mad_send_wc->status;
2064 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2065 }
2066
2067 if (--mad_send_wr->refcount > 0) {
2068 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2069 mad_send_wr->status == IB_WC_SUCCESS) {
2070 wait_for_response(mad_send_wr);
2071 }
2072 goto done;
2073 }
2074
2075 /* Remove send from MAD agent and notify client of completion */
2076 list_del(&mad_send_wr->agent_list);
2077 adjust_timeout(mad_agent_priv);
2078 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2079
2080 if (mad_send_wr->status != IB_WC_SUCCESS )
2081 mad_send_wc->status = mad_send_wr->status;
2082 if (ret == IB_RMPP_RESULT_INTERNAL)
2083 ib_rmpp_send_handler(mad_send_wc);
2084 else
2085 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2086 mad_send_wc);
2087
2088 /* Release reference on agent taken when sending */
2089 deref_mad_agent(mad_agent_priv);
2090 return;
2091done:
2092 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2093}
2094
2095static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2096 struct ib_wc *wc)
2097{
2098 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2099 struct ib_mad_list_head *mad_list;
2100 struct ib_mad_qp_info *qp_info;
2101 struct ib_mad_queue *send_queue;
2102 struct ib_send_wr *bad_send_wr;
2103 struct ib_mad_send_wc mad_send_wc;
2104 unsigned long flags;
2105 int ret;
2106
2107 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2108 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2109 mad_list);
2110 send_queue = mad_list->mad_queue;
2111 qp_info = send_queue->qp_info;
2112
2113retry:
2114 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2115 mad_send_wr->header_mapping,
2116 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2117 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2118 mad_send_wr->payload_mapping,
2119 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2120 queued_send_wr = NULL;
2121 spin_lock_irqsave(&send_queue->lock, flags);
2122 list_del(&mad_list->list);
2123
2124 /* Move queued send to the send queue */
2125 if (send_queue->count-- > send_queue->max_active) {
2126 mad_list = container_of(qp_info->overflow_list.next,
2127 struct ib_mad_list_head, list);
2128 queued_send_wr = container_of(mad_list,
2129 struct ib_mad_send_wr_private,
2130 mad_list);
2131 list_move_tail(&mad_list->list, &send_queue->list);
2132 }
2133 spin_unlock_irqrestore(&send_queue->lock, flags);
2134
2135 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2136 mad_send_wc.status = wc->status;
2137 mad_send_wc.vendor_err = wc->vendor_err;
2138 if (atomic_read(&qp_info->snoop_count))
2139 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2140 IB_MAD_SNOOP_SEND_COMPLETIONS);
2141 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2142
2143 if (queued_send_wr) {
2144 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2145 &bad_send_wr);
2146 if (ret) {
2147 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2148 mad_send_wr = queued_send_wr;
2149 wc->status = IB_WC_LOC_QP_OP_ERR;
2150 goto retry;
2151 }
2152 }
2153}
2154
2155static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2156{
2157 struct ib_mad_send_wr_private *mad_send_wr;
2158 struct ib_mad_list_head *mad_list;
2159 unsigned long flags;
2160
2161 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2162 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2163 mad_send_wr = container_of(mad_list,
2164 struct ib_mad_send_wr_private,
2165 mad_list);
2166 mad_send_wr->retry = 1;
2167 }
2168 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2169}
2170
2171static void mad_error_handler(struct ib_mad_port_private *port_priv,
2172 struct ib_wc *wc)
2173{
2174 struct ib_mad_list_head *mad_list;
2175 struct ib_mad_qp_info *qp_info;
2176 struct ib_mad_send_wr_private *mad_send_wr;
2177 int ret;
2178
2179 /* Determine if failure was a send or receive */
2180 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2181 qp_info = mad_list->mad_queue->qp_info;
2182 if (mad_list->mad_queue == &qp_info->recv_queue)
2183 /*
2184 * Receive errors indicate that the QP has entered the error
2185 * state - error handling/shutdown code will cleanup
2186 */
2187 return;
2188
2189 /*
2190 * Send errors will transition the QP to SQE - move
2191 * QP to RTS and repost flushed work requests
2192 */
2193 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2194 mad_list);
2195 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2196 if (mad_send_wr->retry) {
2197 /* Repost send */
2198 struct ib_send_wr *bad_send_wr;
2199
2200 mad_send_wr->retry = 0;
2201 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2202 &bad_send_wr);
2203 if (ret)
2204 ib_mad_send_done_handler(port_priv, wc);
2205 } else
2206 ib_mad_send_done_handler(port_priv, wc);
2207 } else {
2208 struct ib_qp_attr *attr;
2209
2210 /* Transition QP to RTS and fail offending send */
2211 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2212 if (attr) {
2213 attr->qp_state = IB_QPS_RTS;
2214 attr->cur_qp_state = IB_QPS_SQE;
2215 ret = ib_modify_qp(qp_info->qp, attr,
2216 IB_QP_STATE | IB_QP_CUR_STATE);
2217 kfree(attr);
2218 if (ret)
2219 printk(KERN_ERR PFX "mad_error_handler - "
2220 "ib_modify_qp to RTS : %d\n", ret);
2221 else
2222 mark_sends_for_retry(qp_info);
2223 }
2224 ib_mad_send_done_handler(port_priv, wc);
2225 }
2226}
2227
2228/*
2229 * IB MAD completion callback
2230 */
2231static void ib_mad_completion_handler(struct work_struct *work)
2232{
2233 struct ib_mad_port_private *port_priv;
2234 struct ib_wc wc;
2235
2236 port_priv = container_of(work, struct ib_mad_port_private, work);
2237 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2238
2239 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2240 if (wc.status == IB_WC_SUCCESS) {
2241 switch (wc.opcode) {
2242 case IB_WC_SEND:
2243 ib_mad_send_done_handler(port_priv, &wc);
2244 break;
2245 case IB_WC_RECV:
2246 ib_mad_recv_done_handler(port_priv, &wc);
2247 break;
2248 default:
2249 BUG_ON(1);
2250 break;
2251 }
2252 } else
2253 mad_error_handler(port_priv, &wc);
2254 }
2255}
2256
2257static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2258{
2259 unsigned long flags;
2260 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2261 struct ib_mad_send_wc mad_send_wc;
2262 struct list_head cancel_list;
2263
2264 INIT_LIST_HEAD(&cancel_list);
2265
2266 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2267 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2268 &mad_agent_priv->send_list, agent_list) {
2269 if (mad_send_wr->status == IB_WC_SUCCESS) {
2270 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2271 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2272 }
2273 }
2274
2275 /* Empty wait list to prevent receives from finding a request */
2276 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2277 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2278
2279 /* Report all cancelled requests */
2280 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2281 mad_send_wc.vendor_err = 0;
2282
2283 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2284 &cancel_list, agent_list) {
2285 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2286 list_del(&mad_send_wr->agent_list);
2287 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2288 &mad_send_wc);
2289 atomic_dec(&mad_agent_priv->refcount);
2290 }
2291}
2292
2293static struct ib_mad_send_wr_private*
2294find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2295 struct ib_mad_send_buf *send_buf)
2296{
2297 struct ib_mad_send_wr_private *mad_send_wr;
2298
2299 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2300 agent_list) {
2301 if (&mad_send_wr->send_buf == send_buf)
2302 return mad_send_wr;
2303 }
2304
2305 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2306 agent_list) {
2307 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2308 &mad_send_wr->send_buf == send_buf)
2309 return mad_send_wr;
2310 }
2311 return NULL;
2312}
2313
2314int ib_modify_mad(struct ib_mad_agent *mad_agent,
2315 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2316{
2317 struct ib_mad_agent_private *mad_agent_priv;
2318 struct ib_mad_send_wr_private *mad_send_wr;
2319 unsigned long flags;
2320 int active;
2321
2322 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2323 agent);
2324 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2325 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2326 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2327 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2328 return -EINVAL;
2329 }
2330
2331 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2332 if (!timeout_ms) {
2333 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2334 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2335 }
2336
2337 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2338 if (active)
2339 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2340 else
2341 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2342
2343 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2344 return 0;
2345}
2346EXPORT_SYMBOL(ib_modify_mad);
2347
2348void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2349 struct ib_mad_send_buf *send_buf)
2350{
2351 ib_modify_mad(mad_agent, send_buf, 0);
2352}
2353EXPORT_SYMBOL(ib_cancel_mad);
2354
2355static void local_completions(struct work_struct *work)
2356{
2357 struct ib_mad_agent_private *mad_agent_priv;
2358 struct ib_mad_local_private *local;
2359 struct ib_mad_agent_private *recv_mad_agent;
2360 unsigned long flags;
2361 int free_mad;
2362 struct ib_wc wc;
2363 struct ib_mad_send_wc mad_send_wc;
2364
2365 mad_agent_priv =
2366 container_of(work, struct ib_mad_agent_private, local_work);
2367
2368 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2369 while (!list_empty(&mad_agent_priv->local_list)) {
2370 local = list_entry(mad_agent_priv->local_list.next,
2371 struct ib_mad_local_private,
2372 completion_list);
2373 list_del(&local->completion_list);
2374 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2375 free_mad = 0;
2376 if (local->mad_priv) {
2377 recv_mad_agent = local->recv_mad_agent;
2378 if (!recv_mad_agent) {
2379 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2380 free_mad = 1;
2381 goto local_send_completion;
2382 }
2383
2384 /*
2385 * Defined behavior is to complete response
2386 * before request
2387 */
2388 build_smp_wc(recv_mad_agent->agent.qp,
2389 (unsigned long) local->mad_send_wr,
2390 be16_to_cpu(IB_LID_PERMISSIVE),
2391 0, recv_mad_agent->agent.port_num, &wc);
2392
2393 local->mad_priv->header.recv_wc.wc = &wc;
2394 local->mad_priv->header.recv_wc.mad_len =
2395 sizeof(struct ib_mad);
2396 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2397 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2398 &local->mad_priv->header.recv_wc.rmpp_list);
2399 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2400 local->mad_priv->header.recv_wc.recv_buf.mad =
2401 &local->mad_priv->mad.mad;
2402 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2403 snoop_recv(recv_mad_agent->qp_info,
2404 &local->mad_priv->header.recv_wc,
2405 IB_MAD_SNOOP_RECVS);
2406 recv_mad_agent->agent.recv_handler(
2407 &recv_mad_agent->agent,
2408 &local->mad_priv->header.recv_wc);
2409 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2410 atomic_dec(&recv_mad_agent->refcount);
2411 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2412 }
2413
2414local_send_completion:
2415 /* Complete send */
2416 mad_send_wc.status = IB_WC_SUCCESS;
2417 mad_send_wc.vendor_err = 0;
2418 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2419 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2420 snoop_send(mad_agent_priv->qp_info,
2421 &local->mad_send_wr->send_buf,
2422 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2423 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2424 &mad_send_wc);
2425
2426 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2427 atomic_dec(&mad_agent_priv->refcount);
2428 if (free_mad)
2429 kmem_cache_free(ib_mad_cache, local->mad_priv);
2430 kfree(local);
2431 }
2432 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2433}
2434
2435static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2436{
2437 int ret;
2438
2439 if (!mad_send_wr->retries_left)
2440 return -ETIMEDOUT;
2441
2442 mad_send_wr->retries_left--;
2443 mad_send_wr->send_buf.retries++;
2444
2445 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2446
2447 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2448 ret = ib_retry_rmpp(mad_send_wr);
2449 switch (ret) {
2450 case IB_RMPP_RESULT_UNHANDLED:
2451 ret = ib_send_mad(mad_send_wr);
2452 break;
2453 case IB_RMPP_RESULT_CONSUMED:
2454 ret = 0;
2455 break;
2456 default:
2457 ret = -ECOMM;
2458 break;
2459 }
2460 } else
2461 ret = ib_send_mad(mad_send_wr);
2462
2463 if (!ret) {
2464 mad_send_wr->refcount++;
2465 list_add_tail(&mad_send_wr->agent_list,
2466 &mad_send_wr->mad_agent_priv->send_list);
2467 }
2468 return ret;
2469}
2470
2471static void timeout_sends(struct work_struct *work)
2472{
2473 struct ib_mad_agent_private *mad_agent_priv;
2474 struct ib_mad_send_wr_private *mad_send_wr;
2475 struct ib_mad_send_wc mad_send_wc;
2476 unsigned long flags, delay;
2477
2478 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2479 timed_work.work);
2480 mad_send_wc.vendor_err = 0;
2481
2482 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2483 while (!list_empty(&mad_agent_priv->wait_list)) {
2484 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2485 struct ib_mad_send_wr_private,
2486 agent_list);
2487
2488 if (time_after(mad_send_wr->timeout, jiffies)) {
2489 delay = mad_send_wr->timeout - jiffies;
2490 if ((long)delay <= 0)
2491 delay = 1;
2492 queue_delayed_work(mad_agent_priv->qp_info->
2493 port_priv->wq,
2494 &mad_agent_priv->timed_work, delay);
2495 break;
2496 }
2497
2498 list_del(&mad_send_wr->agent_list);
2499 if (mad_send_wr->status == IB_WC_SUCCESS &&
2500 !retry_send(mad_send_wr))
2501 continue;
2502
2503 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2504
2505 if (mad_send_wr->status == IB_WC_SUCCESS)
2506 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2507 else
2508 mad_send_wc.status = mad_send_wr->status;
2509 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2510 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2511 &mad_send_wc);
2512
2513 atomic_dec(&mad_agent_priv->refcount);
2514 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2515 }
2516 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2517}
2518
2519static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2520{
2521 struct ib_mad_port_private *port_priv = cq->cq_context;
2522 unsigned long flags;
2523
2524 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2525 if (!list_empty(&port_priv->port_list))
2526 queue_work(port_priv->wq, &port_priv->work);
2527 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2528}
2529
2530/*
2531 * Allocate receive MADs and post receive WRs for them
2532 */
2533static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2534 struct ib_mad_private *mad)
2535{
2536 unsigned long flags;
2537 int post, ret;
2538 struct ib_mad_private *mad_priv;
2539 struct ib_sge sg_list;
2540 struct ib_recv_wr recv_wr, *bad_recv_wr;
2541 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2542
2543 /* Initialize common scatter list fields */
2544 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2545 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2546
2547 /* Initialize common receive WR fields */
2548 recv_wr.next = NULL;
2549 recv_wr.sg_list = &sg_list;
2550 recv_wr.num_sge = 1;
2551
2552 do {
2553 /* Allocate and map receive buffer */
2554 if (mad) {
2555 mad_priv = mad;
2556 mad = NULL;
2557 } else {
2558 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2559 if (!mad_priv) {
2560 printk(KERN_ERR PFX "No memory for receive buffer\n");
2561 ret = -ENOMEM;
2562 break;
2563 }
2564 }
2565 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2566 &mad_priv->grh,
2567 sizeof *mad_priv -
2568 sizeof mad_priv->header,
2569 DMA_FROM_DEVICE);
2570 mad_priv->header.mapping = sg_list.addr;
2571 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2572 mad_priv->header.mad_list.mad_queue = recv_queue;
2573
2574 /* Post receive WR */
2575 spin_lock_irqsave(&recv_queue->lock, flags);
2576 post = (++recv_queue->count < recv_queue->max_active);
2577 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2578 spin_unlock_irqrestore(&recv_queue->lock, flags);
2579 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2580 if (ret) {
2581 spin_lock_irqsave(&recv_queue->lock, flags);
2582 list_del(&mad_priv->header.mad_list.list);
2583 recv_queue->count--;
2584 spin_unlock_irqrestore(&recv_queue->lock, flags);
2585 ib_dma_unmap_single(qp_info->port_priv->device,
2586 mad_priv->header.mapping,
2587 sizeof *mad_priv -
2588 sizeof mad_priv->header,
2589 DMA_FROM_DEVICE);
2590 kmem_cache_free(ib_mad_cache, mad_priv);
2591 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2592 break;
2593 }
2594 } while (post);
2595
2596 return ret;
2597}
2598
2599/*
2600 * Return all the posted receive MADs
2601 */
2602static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2603{
2604 struct ib_mad_private_header *mad_priv_hdr;
2605 struct ib_mad_private *recv;
2606 struct ib_mad_list_head *mad_list;
2607
2608 if (!qp_info->qp)
2609 return;
2610
2611 while (!list_empty(&qp_info->recv_queue.list)) {
2612
2613 mad_list = list_entry(qp_info->recv_queue.list.next,
2614 struct ib_mad_list_head, list);
2615 mad_priv_hdr = container_of(mad_list,
2616 struct ib_mad_private_header,
2617 mad_list);
2618 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2619 header);
2620
2621 /* Remove from posted receive MAD list */
2622 list_del(&mad_list->list);
2623
2624 ib_dma_unmap_single(qp_info->port_priv->device,
2625 recv->header.mapping,
2626 sizeof(struct ib_mad_private) -
2627 sizeof(struct ib_mad_private_header),
2628 DMA_FROM_DEVICE);
2629 kmem_cache_free(ib_mad_cache, recv);
2630 }
2631
2632 qp_info->recv_queue.count = 0;
2633}
2634
2635/*
2636 * Start the port
2637 */
2638static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2639{
2640 int ret, i;
2641 struct ib_qp_attr *attr;
2642 struct ib_qp *qp;
2643
2644 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2645 if (!attr) {
2646 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2647 return -ENOMEM;
2648 }
2649
2650 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2651 qp = port_priv->qp_info[i].qp;
2652 if (!qp)
2653 continue;
2654
2655 /*
2656 * PKey index for QP1 is irrelevant but
2657 * one is needed for the Reset to Init transition
2658 */
2659 attr->qp_state = IB_QPS_INIT;
2660 attr->pkey_index = 0;
2661 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2663 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2664 if (ret) {
2665 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2666 "INIT: %d\n", i, ret);
2667 goto out;
2668 }
2669
2670 attr->qp_state = IB_QPS_RTR;
2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2672 if (ret) {
2673 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674 "RTR: %d\n", i, ret);
2675 goto out;
2676 }
2677
2678 attr->qp_state = IB_QPS_RTS;
2679 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2680 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2681 if (ret) {
2682 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2683 "RTS: %d\n", i, ret);
2684 goto out;
2685 }
2686 }
2687
2688 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2689 if (ret) {
2690 printk(KERN_ERR PFX "Failed to request completion "
2691 "notification: %d\n", ret);
2692 goto out;
2693 }
2694
2695 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2696 if (!port_priv->qp_info[i].qp)
2697 continue;
2698
2699 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2700 if (ret) {
2701 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2702 goto out;
2703 }
2704 }
2705out:
2706 kfree(attr);
2707 return ret;
2708}
2709
2710static void qp_event_handler(struct ib_event *event, void *qp_context)
2711{
2712 struct ib_mad_qp_info *qp_info = qp_context;
2713
2714 /* It's worse than that! He's dead, Jim! */
2715 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2716 event->event, qp_info->qp->qp_num);
2717}
2718
2719static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2720 struct ib_mad_queue *mad_queue)
2721{
2722 mad_queue->qp_info = qp_info;
2723 mad_queue->count = 0;
2724 spin_lock_init(&mad_queue->lock);
2725 INIT_LIST_HEAD(&mad_queue->list);
2726}
2727
2728static void init_mad_qp(struct ib_mad_port_private *port_priv,
2729 struct ib_mad_qp_info *qp_info)
2730{
2731 qp_info->port_priv = port_priv;
2732 init_mad_queue(qp_info, &qp_info->send_queue);
2733 init_mad_queue(qp_info, &qp_info->recv_queue);
2734 INIT_LIST_HEAD(&qp_info->overflow_list);
2735 spin_lock_init(&qp_info->snoop_lock);
2736 qp_info->snoop_table = NULL;
2737 qp_info->snoop_table_size = 0;
2738 atomic_set(&qp_info->snoop_count, 0);
2739}
2740
2741static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2742 enum ib_qp_type qp_type)
2743{
2744 struct ib_qp_init_attr qp_init_attr;
2745 int ret;
2746
2747 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2748 qp_init_attr.send_cq = qp_info->port_priv->cq;
2749 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2750 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2751 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2752 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2753 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2754 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2755 qp_init_attr.qp_type = qp_type;
2756 qp_init_attr.port_num = qp_info->port_priv->port_num;
2757 qp_init_attr.qp_context = qp_info;
2758 qp_init_attr.event_handler = qp_event_handler;
2759 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2760 if (IS_ERR(qp_info->qp)) {
2761 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2762 get_spl_qp_index(qp_type));
2763 ret = PTR_ERR(qp_info->qp);
2764 goto error;
2765 }
2766 /* Use minimum queue sizes unless the CQ is resized */
2767 qp_info->send_queue.max_active = mad_sendq_size;
2768 qp_info->recv_queue.max_active = mad_recvq_size;
2769 return 0;
2770
2771error:
2772 return ret;
2773}
2774
2775static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2776{
2777 if (!qp_info->qp)
2778 return;
2779
2780 ib_destroy_qp(qp_info->qp);
2781 kfree(qp_info->snoop_table);
2782}
2783
2784/*
2785 * Open the port
2786 * Create the QP, PD, MR, and CQ if needed
2787 */
2788static int ib_mad_port_open(struct ib_device *device,
2789 int port_num)
2790{
2791 int ret, cq_size;
2792 struct ib_mad_port_private *port_priv;
2793 unsigned long flags;
2794 char name[sizeof "ib_mad123"];
2795 int has_smi;
2796
2797 /* Create new device info */
2798 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2799 if (!port_priv) {
2800 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2801 return -ENOMEM;
2802 }
2803
2804 port_priv->device = device;
2805 port_priv->port_num = port_num;
2806 spin_lock_init(&port_priv->reg_lock);
2807 INIT_LIST_HEAD(&port_priv->agent_list);
2808 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2809 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2810
2811 cq_size = mad_sendq_size + mad_recvq_size;
2812 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2813 if (has_smi)
2814 cq_size *= 2;
2815
2816 port_priv->cq = ib_create_cq(port_priv->device,
2817 ib_mad_thread_completion_handler,
2818 NULL, port_priv, cq_size, 0);
2819 if (IS_ERR(port_priv->cq)) {
2820 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2821 ret = PTR_ERR(port_priv->cq);
2822 goto error3;
2823 }
2824
2825 port_priv->pd = ib_alloc_pd(device);
2826 if (IS_ERR(port_priv->pd)) {
2827 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2828 ret = PTR_ERR(port_priv->pd);
2829 goto error4;
2830 }
2831
2832 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2833 if (IS_ERR(port_priv->mr)) {
2834 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2835 ret = PTR_ERR(port_priv->mr);
2836 goto error5;
2837 }
2838
2839 if (has_smi) {
2840 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2841 if (ret)
2842 goto error6;
2843 }
2844 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2845 if (ret)
2846 goto error7;
2847
2848 snprintf(name, sizeof name, "ib_mad%d", port_num);
2849 port_priv->wq = create_singlethread_workqueue(name);
2850 if (!port_priv->wq) {
2851 ret = -ENOMEM;
2852 goto error8;
2853 }
2854 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2855
2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2857 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2858 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2859
2860 ret = ib_mad_port_start(port_priv);
2861 if (ret) {
2862 printk(KERN_ERR PFX "Couldn't start port\n");
2863 goto error9;
2864 }
2865
2866 return 0;
2867
2868error9:
2869 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2870 list_del_init(&port_priv->port_list);
2871 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2872
2873 destroy_workqueue(port_priv->wq);
2874error8:
2875 destroy_mad_qp(&port_priv->qp_info[1]);
2876error7:
2877 destroy_mad_qp(&port_priv->qp_info[0]);
2878error6:
2879 ib_dereg_mr(port_priv->mr);
2880error5:
2881 ib_dealloc_pd(port_priv->pd);
2882error4:
2883 ib_destroy_cq(port_priv->cq);
2884 cleanup_recv_queue(&port_priv->qp_info[1]);
2885 cleanup_recv_queue(&port_priv->qp_info[0]);
2886error3:
2887 kfree(port_priv);
2888
2889 return ret;
2890}
2891
2892/*
2893 * Close the port
2894 * If there are no classes using the port, free the port
2895 * resources (CQ, MR, PD, QP) and remove the port's info structure
2896 */
2897static int ib_mad_port_close(struct ib_device *device, int port_num)
2898{
2899 struct ib_mad_port_private *port_priv;
2900 unsigned long flags;
2901
2902 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2903 port_priv = __ib_get_mad_port(device, port_num);
2904 if (port_priv == NULL) {
2905 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2906 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2907 return -ENODEV;
2908 }
2909 list_del_init(&port_priv->port_list);
2910 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2911
2912 destroy_workqueue(port_priv->wq);
2913 destroy_mad_qp(&port_priv->qp_info[1]);
2914 destroy_mad_qp(&port_priv->qp_info[0]);
2915 ib_dereg_mr(port_priv->mr);
2916 ib_dealloc_pd(port_priv->pd);
2917 ib_destroy_cq(port_priv->cq);
2918 cleanup_recv_queue(&port_priv->qp_info[1]);
2919 cleanup_recv_queue(&port_priv->qp_info[0]);
2920 /* XXX: Handle deallocation of MAD registration tables */
2921
2922 kfree(port_priv);
2923
2924 return 0;
2925}
2926
2927static void ib_mad_init_device(struct ib_device *device)
2928{
2929 int start, end, i;
2930
2931 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2932 return;
2933
2934 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2935 start = 0;
2936 end = 0;
2937 } else {
2938 start = 1;
2939 end = device->phys_port_cnt;
2940 }
2941
2942 for (i = start; i <= end; i++) {
2943 if (ib_mad_port_open(device, i)) {
2944 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2945 device->name, i);
2946 goto error;
2947 }
2948 if (ib_agent_port_open(device, i)) {
2949 printk(KERN_ERR PFX "Couldn't open %s port %d "
2950 "for agents\n",
2951 device->name, i);
2952 goto error_agent;
2953 }
2954 }
2955 return;
2956
2957error_agent:
2958 if (ib_mad_port_close(device, i))
2959 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2960 device->name, i);
2961
2962error:
2963 i--;
2964
2965 while (i >= start) {
2966 if (ib_agent_port_close(device, i))
2967 printk(KERN_ERR PFX "Couldn't close %s port %d "
2968 "for agents\n",
2969 device->name, i);
2970 if (ib_mad_port_close(device, i))
2971 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2972 device->name, i);
2973 i--;
2974 }
2975}
2976
2977static void ib_mad_remove_device(struct ib_device *device)
2978{
2979 int i, num_ports, cur_port;
2980
2981 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2982 return;
2983
2984 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2985 num_ports = 1;
2986 cur_port = 0;
2987 } else {
2988 num_ports = device->phys_port_cnt;
2989 cur_port = 1;
2990 }
2991 for (i = 0; i < num_ports; i++, cur_port++) {
2992 if (ib_agent_port_close(device, cur_port))
2993 printk(KERN_ERR PFX "Couldn't close %s port %d "
2994 "for agents\n",
2995 device->name, cur_port);
2996 if (ib_mad_port_close(device, cur_port))
2997 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2998 device->name, cur_port);
2999 }
3000}
3001
3002static struct ib_client mad_client = {
3003 .name = "mad",
3004 .add = ib_mad_init_device,
3005 .remove = ib_mad_remove_device
3006};
3007
3008static int __init ib_mad_init_module(void)
3009{
3010 int ret;
3011
3012 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3013 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3014
3015 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3016 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3017
3018 ib_mad_cache = kmem_cache_create("ib_mad",
3019 sizeof(struct ib_mad_private),
3020 0,
3021 SLAB_HWCACHE_ALIGN,
3022 NULL);
3023 if (!ib_mad_cache) {
3024 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3025 ret = -ENOMEM;
3026 goto error1;
3027 }
3028
3029 INIT_LIST_HEAD(&ib_mad_port_list);
3030
3031 if (ib_register_client(&mad_client)) {
3032 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3033 ret = -EINVAL;
3034 goto error2;
3035 }
3036
3037 return 0;
3038
3039error2:
3040 kmem_cache_destroy(ib_mad_cache);
3041error1:
3042 return ret;
3043}
3044
3045static void __exit ib_mad_cleanup_module(void)
3046{
3047 ib_unregister_client(&mad_client);
3048 kmem_cache_destroy(ib_mad_cache);
3049}
3050
3051module_init(ib_mad_init_module);
3052module_exit(ib_mad_cleanup_module);
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 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 */
36#include <linux/dma-mapping.h>
37#include <linux/slab.h>
38#include <linux/module.h>
39#include <rdma/ib_cache.h>
40
41#include "mad_priv.h"
42#include "mad_rmpp.h"
43#include "smi.h"
44#include "agent.h"
45
46MODULE_LICENSE("Dual BSD/GPL");
47MODULE_DESCRIPTION("kernel IB MAD API");
48MODULE_AUTHOR("Hal Rosenstock");
49MODULE_AUTHOR("Sean Hefty");
50
51static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
52static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
53
54module_param_named(send_queue_size, mad_sendq_size, int, 0444);
55MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
56module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
57MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
58
59static struct kmem_cache *ib_mad_cache;
60
61static struct list_head ib_mad_port_list;
62static u32 ib_mad_client_id = 0;
63
64/* Port list lock */
65static DEFINE_SPINLOCK(ib_mad_port_list_lock);
66
67/* Forward declarations */
68static int method_in_use(struct ib_mad_mgmt_method_table **method,
69 struct ib_mad_reg_req *mad_reg_req);
70static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
71static struct ib_mad_agent_private *find_mad_agent(
72 struct ib_mad_port_private *port_priv,
73 struct ib_mad *mad);
74static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
75 struct ib_mad_private *mad);
76static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
77static void timeout_sends(struct work_struct *work);
78static void local_completions(struct work_struct *work);
79static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
80 struct ib_mad_agent_private *agent_priv,
81 u8 mgmt_class);
82static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv);
84
85/*
86 * Returns a ib_mad_port_private structure or NULL for a device/port
87 * Assumes ib_mad_port_list_lock is being held
88 */
89static inline struct ib_mad_port_private *
90__ib_get_mad_port(struct ib_device *device, int port_num)
91{
92 struct ib_mad_port_private *entry;
93
94 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
95 if (entry->device == device && entry->port_num == port_num)
96 return entry;
97 }
98 return NULL;
99}
100
101/*
102 * Wrapper function to return a ib_mad_port_private structure or NULL
103 * for a device/port
104 */
105static inline struct ib_mad_port_private *
106ib_get_mad_port(struct ib_device *device, int port_num)
107{
108 struct ib_mad_port_private *entry;
109 unsigned long flags;
110
111 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
112 entry = __ib_get_mad_port(device, port_num);
113 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
114
115 return entry;
116}
117
118static inline u8 convert_mgmt_class(u8 mgmt_class)
119{
120 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
121 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
122 0 : mgmt_class;
123}
124
125static int get_spl_qp_index(enum ib_qp_type qp_type)
126{
127 switch (qp_type)
128 {
129 case IB_QPT_SMI:
130 return 0;
131 case IB_QPT_GSI:
132 return 1;
133 default:
134 return -1;
135 }
136}
137
138static int vendor_class_index(u8 mgmt_class)
139{
140 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
141}
142
143static int is_vendor_class(u8 mgmt_class)
144{
145 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
146 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
147 return 0;
148 return 1;
149}
150
151static int is_vendor_oui(char *oui)
152{
153 if (oui[0] || oui[1] || oui[2])
154 return 1;
155 return 0;
156}
157
158static int is_vendor_method_in_use(
159 struct ib_mad_mgmt_vendor_class *vendor_class,
160 struct ib_mad_reg_req *mad_reg_req)
161{
162 struct ib_mad_mgmt_method_table *method;
163 int i;
164
165 for (i = 0; i < MAX_MGMT_OUI; i++) {
166 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
167 method = vendor_class->method_table[i];
168 if (method) {
169 if (method_in_use(&method, mad_reg_req))
170 return 1;
171 else
172 break;
173 }
174 }
175 }
176 return 0;
177}
178
179int ib_response_mad(struct ib_mad *mad)
180{
181 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
182 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
183 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
184 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
185}
186EXPORT_SYMBOL(ib_response_mad);
187
188/*
189 * ib_register_mad_agent - Register to send/receive MADs
190 */
191struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
192 u8 port_num,
193 enum ib_qp_type qp_type,
194 struct ib_mad_reg_req *mad_reg_req,
195 u8 rmpp_version,
196 ib_mad_send_handler send_handler,
197 ib_mad_recv_handler recv_handler,
198 void *context)
199{
200 struct ib_mad_port_private *port_priv;
201 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
202 struct ib_mad_agent_private *mad_agent_priv;
203 struct ib_mad_reg_req *reg_req = NULL;
204 struct ib_mad_mgmt_class_table *class;
205 struct ib_mad_mgmt_vendor_class_table *vendor;
206 struct ib_mad_mgmt_vendor_class *vendor_class;
207 struct ib_mad_mgmt_method_table *method;
208 int ret2, qpn;
209 unsigned long flags;
210 u8 mgmt_class, vclass;
211
212 /* Validate parameters */
213 qpn = get_spl_qp_index(qp_type);
214 if (qpn == -1)
215 goto error1;
216
217 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
218 goto error1;
219
220 /* Validate MAD registration request if supplied */
221 if (mad_reg_req) {
222 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
223 goto error1;
224 if (!recv_handler)
225 goto error1;
226 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
227 /*
228 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
229 * one in this range currently allowed
230 */
231 if (mad_reg_req->mgmt_class !=
232 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
233 goto error1;
234 } else if (mad_reg_req->mgmt_class == 0) {
235 /*
236 * Class 0 is reserved in IBA and is used for
237 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
238 */
239 goto error1;
240 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
241 /*
242 * If class is in "new" vendor range,
243 * ensure supplied OUI is not zero
244 */
245 if (!is_vendor_oui(mad_reg_req->oui))
246 goto error1;
247 }
248 /* Make sure class supplied is consistent with RMPP */
249 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
250 if (rmpp_version)
251 goto error1;
252 }
253 /* Make sure class supplied is consistent with QP type */
254 if (qp_type == IB_QPT_SMI) {
255 if ((mad_reg_req->mgmt_class !=
256 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
257 (mad_reg_req->mgmt_class !=
258 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
259 goto error1;
260 } else {
261 if ((mad_reg_req->mgmt_class ==
262 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
263 (mad_reg_req->mgmt_class ==
264 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
265 goto error1;
266 }
267 } else {
268 /* No registration request supplied */
269 if (!send_handler)
270 goto error1;
271 }
272
273 /* Validate device and port */
274 port_priv = ib_get_mad_port(device, port_num);
275 if (!port_priv) {
276 ret = ERR_PTR(-ENODEV);
277 goto error1;
278 }
279
280 /* Verify the QP requested is supported. For example, Ethernet devices
281 * will not have QP0 */
282 if (!port_priv->qp_info[qpn].qp) {
283 ret = ERR_PTR(-EPROTONOSUPPORT);
284 goto error1;
285 }
286
287 /* Allocate structures */
288 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
289 if (!mad_agent_priv) {
290 ret = ERR_PTR(-ENOMEM);
291 goto error1;
292 }
293
294 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
295 IB_ACCESS_LOCAL_WRITE);
296 if (IS_ERR(mad_agent_priv->agent.mr)) {
297 ret = ERR_PTR(-ENOMEM);
298 goto error2;
299 }
300
301 if (mad_reg_req) {
302 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
303 if (!reg_req) {
304 ret = ERR_PTR(-ENOMEM);
305 goto error3;
306 }
307 }
308
309 /* Now, fill in the various structures */
310 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
311 mad_agent_priv->reg_req = reg_req;
312 mad_agent_priv->agent.rmpp_version = rmpp_version;
313 mad_agent_priv->agent.device = device;
314 mad_agent_priv->agent.recv_handler = recv_handler;
315 mad_agent_priv->agent.send_handler = send_handler;
316 mad_agent_priv->agent.context = context;
317 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
318 mad_agent_priv->agent.port_num = port_num;
319 spin_lock_init(&mad_agent_priv->lock);
320 INIT_LIST_HEAD(&mad_agent_priv->send_list);
321 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
322 INIT_LIST_HEAD(&mad_agent_priv->done_list);
323 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
324 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
325 INIT_LIST_HEAD(&mad_agent_priv->local_list);
326 INIT_WORK(&mad_agent_priv->local_work, local_completions);
327 atomic_set(&mad_agent_priv->refcount, 1);
328 init_completion(&mad_agent_priv->comp);
329
330 spin_lock_irqsave(&port_priv->reg_lock, flags);
331 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
332
333 /*
334 * Make sure MAD registration (if supplied)
335 * is non overlapping with any existing ones
336 */
337 if (mad_reg_req) {
338 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
339 if (!is_vendor_class(mgmt_class)) {
340 class = port_priv->version[mad_reg_req->
341 mgmt_class_version].class;
342 if (class) {
343 method = class->method_table[mgmt_class];
344 if (method) {
345 if (method_in_use(&method,
346 mad_reg_req))
347 goto error4;
348 }
349 }
350 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
351 mgmt_class);
352 } else {
353 /* "New" vendor class range */
354 vendor = port_priv->version[mad_reg_req->
355 mgmt_class_version].vendor;
356 if (vendor) {
357 vclass = vendor_class_index(mgmt_class);
358 vendor_class = vendor->vendor_class[vclass];
359 if (vendor_class) {
360 if (is_vendor_method_in_use(
361 vendor_class,
362 mad_reg_req))
363 goto error4;
364 }
365 }
366 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
367 }
368 if (ret2) {
369 ret = ERR_PTR(ret2);
370 goto error4;
371 }
372 }
373
374 /* Add mad agent into port's agent list */
375 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
376 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
377
378 return &mad_agent_priv->agent;
379
380error4:
381 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
382 kfree(reg_req);
383error3:
384 ib_dereg_mr(mad_agent_priv->agent.mr);
385error2:
386 kfree(mad_agent_priv);
387error1:
388 return ret;
389}
390EXPORT_SYMBOL(ib_register_mad_agent);
391
392static inline int is_snooping_sends(int mad_snoop_flags)
393{
394 return (mad_snoop_flags &
395 (/*IB_MAD_SNOOP_POSTED_SENDS |
396 IB_MAD_SNOOP_RMPP_SENDS |*/
397 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
398 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
399}
400
401static inline int is_snooping_recvs(int mad_snoop_flags)
402{
403 return (mad_snoop_flags &
404 (IB_MAD_SNOOP_RECVS /*|
405 IB_MAD_SNOOP_RMPP_RECVS*/));
406}
407
408static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
409 struct ib_mad_snoop_private *mad_snoop_priv)
410{
411 struct ib_mad_snoop_private **new_snoop_table;
412 unsigned long flags;
413 int i;
414
415 spin_lock_irqsave(&qp_info->snoop_lock, flags);
416 /* Check for empty slot in array. */
417 for (i = 0; i < qp_info->snoop_table_size; i++)
418 if (!qp_info->snoop_table[i])
419 break;
420
421 if (i == qp_info->snoop_table_size) {
422 /* Grow table. */
423 new_snoop_table = krealloc(qp_info->snoop_table,
424 sizeof mad_snoop_priv *
425 (qp_info->snoop_table_size + 1),
426 GFP_ATOMIC);
427 if (!new_snoop_table) {
428 i = -ENOMEM;
429 goto out;
430 }
431
432 qp_info->snoop_table = new_snoop_table;
433 qp_info->snoop_table_size++;
434 }
435 qp_info->snoop_table[i] = mad_snoop_priv;
436 atomic_inc(&qp_info->snoop_count);
437out:
438 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
439 return i;
440}
441
442struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
443 u8 port_num,
444 enum ib_qp_type qp_type,
445 int mad_snoop_flags,
446 ib_mad_snoop_handler snoop_handler,
447 ib_mad_recv_handler recv_handler,
448 void *context)
449{
450 struct ib_mad_port_private *port_priv;
451 struct ib_mad_agent *ret;
452 struct ib_mad_snoop_private *mad_snoop_priv;
453 int qpn;
454
455 /* Validate parameters */
456 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
457 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
458 ret = ERR_PTR(-EINVAL);
459 goto error1;
460 }
461 qpn = get_spl_qp_index(qp_type);
462 if (qpn == -1) {
463 ret = ERR_PTR(-EINVAL);
464 goto error1;
465 }
466 port_priv = ib_get_mad_port(device, port_num);
467 if (!port_priv) {
468 ret = ERR_PTR(-ENODEV);
469 goto error1;
470 }
471 /* Allocate structures */
472 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
473 if (!mad_snoop_priv) {
474 ret = ERR_PTR(-ENOMEM);
475 goto error1;
476 }
477
478 /* Now, fill in the various structures */
479 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
480 mad_snoop_priv->agent.device = device;
481 mad_snoop_priv->agent.recv_handler = recv_handler;
482 mad_snoop_priv->agent.snoop_handler = snoop_handler;
483 mad_snoop_priv->agent.context = context;
484 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
485 mad_snoop_priv->agent.port_num = port_num;
486 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
487 init_completion(&mad_snoop_priv->comp);
488 mad_snoop_priv->snoop_index = register_snoop_agent(
489 &port_priv->qp_info[qpn],
490 mad_snoop_priv);
491 if (mad_snoop_priv->snoop_index < 0) {
492 ret = ERR_PTR(mad_snoop_priv->snoop_index);
493 goto error2;
494 }
495
496 atomic_set(&mad_snoop_priv->refcount, 1);
497 return &mad_snoop_priv->agent;
498
499error2:
500 kfree(mad_snoop_priv);
501error1:
502 return ret;
503}
504EXPORT_SYMBOL(ib_register_mad_snoop);
505
506static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
507{
508 if (atomic_dec_and_test(&mad_agent_priv->refcount))
509 complete(&mad_agent_priv->comp);
510}
511
512static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
513{
514 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
515 complete(&mad_snoop_priv->comp);
516}
517
518static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
519{
520 struct ib_mad_port_private *port_priv;
521 unsigned long flags;
522
523 /* Note that we could still be handling received MADs */
524
525 /*
526 * Canceling all sends results in dropping received response
527 * MADs, preventing us from queuing additional work
528 */
529 cancel_mads(mad_agent_priv);
530 port_priv = mad_agent_priv->qp_info->port_priv;
531 cancel_delayed_work(&mad_agent_priv->timed_work);
532
533 spin_lock_irqsave(&port_priv->reg_lock, flags);
534 remove_mad_reg_req(mad_agent_priv);
535 list_del(&mad_agent_priv->agent_list);
536 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
537
538 flush_workqueue(port_priv->wq);
539 ib_cancel_rmpp_recvs(mad_agent_priv);
540
541 deref_mad_agent(mad_agent_priv);
542 wait_for_completion(&mad_agent_priv->comp);
543
544 kfree(mad_agent_priv->reg_req);
545 ib_dereg_mr(mad_agent_priv->agent.mr);
546 kfree(mad_agent_priv);
547}
548
549static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
550{
551 struct ib_mad_qp_info *qp_info;
552 unsigned long flags;
553
554 qp_info = mad_snoop_priv->qp_info;
555 spin_lock_irqsave(&qp_info->snoop_lock, flags);
556 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
557 atomic_dec(&qp_info->snoop_count);
558 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
559
560 deref_snoop_agent(mad_snoop_priv);
561 wait_for_completion(&mad_snoop_priv->comp);
562
563 kfree(mad_snoop_priv);
564}
565
566/*
567 * ib_unregister_mad_agent - Unregisters a client from using MAD services
568 */
569int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
570{
571 struct ib_mad_agent_private *mad_agent_priv;
572 struct ib_mad_snoop_private *mad_snoop_priv;
573
574 /* If the TID is zero, the agent can only snoop. */
575 if (mad_agent->hi_tid) {
576 mad_agent_priv = container_of(mad_agent,
577 struct ib_mad_agent_private,
578 agent);
579 unregister_mad_agent(mad_agent_priv);
580 } else {
581 mad_snoop_priv = container_of(mad_agent,
582 struct ib_mad_snoop_private,
583 agent);
584 unregister_mad_snoop(mad_snoop_priv);
585 }
586 return 0;
587}
588EXPORT_SYMBOL(ib_unregister_mad_agent);
589
590static void dequeue_mad(struct ib_mad_list_head *mad_list)
591{
592 struct ib_mad_queue *mad_queue;
593 unsigned long flags;
594
595 BUG_ON(!mad_list->mad_queue);
596 mad_queue = mad_list->mad_queue;
597 spin_lock_irqsave(&mad_queue->lock, flags);
598 list_del(&mad_list->list);
599 mad_queue->count--;
600 spin_unlock_irqrestore(&mad_queue->lock, flags);
601}
602
603static void snoop_send(struct ib_mad_qp_info *qp_info,
604 struct ib_mad_send_buf *send_buf,
605 struct ib_mad_send_wc *mad_send_wc,
606 int mad_snoop_flags)
607{
608 struct ib_mad_snoop_private *mad_snoop_priv;
609 unsigned long flags;
610 int i;
611
612 spin_lock_irqsave(&qp_info->snoop_lock, flags);
613 for (i = 0; i < qp_info->snoop_table_size; i++) {
614 mad_snoop_priv = qp_info->snoop_table[i];
615 if (!mad_snoop_priv ||
616 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
617 continue;
618
619 atomic_inc(&mad_snoop_priv->refcount);
620 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
621 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
622 send_buf, mad_send_wc);
623 deref_snoop_agent(mad_snoop_priv);
624 spin_lock_irqsave(&qp_info->snoop_lock, flags);
625 }
626 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
627}
628
629static void snoop_recv(struct ib_mad_qp_info *qp_info,
630 struct ib_mad_recv_wc *mad_recv_wc,
631 int mad_snoop_flags)
632{
633 struct ib_mad_snoop_private *mad_snoop_priv;
634 unsigned long flags;
635 int i;
636
637 spin_lock_irqsave(&qp_info->snoop_lock, flags);
638 for (i = 0; i < qp_info->snoop_table_size; i++) {
639 mad_snoop_priv = qp_info->snoop_table[i];
640 if (!mad_snoop_priv ||
641 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
642 continue;
643
644 atomic_inc(&mad_snoop_priv->refcount);
645 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
646 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
647 mad_recv_wc);
648 deref_snoop_agent(mad_snoop_priv);
649 spin_lock_irqsave(&qp_info->snoop_lock, flags);
650 }
651 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
652}
653
654static void build_smp_wc(struct ib_qp *qp,
655 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
656 struct ib_wc *wc)
657{
658 memset(wc, 0, sizeof *wc);
659 wc->wr_id = wr_id;
660 wc->status = IB_WC_SUCCESS;
661 wc->opcode = IB_WC_RECV;
662 wc->pkey_index = pkey_index;
663 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
664 wc->src_qp = IB_QP0;
665 wc->qp = qp;
666 wc->slid = slid;
667 wc->sl = 0;
668 wc->dlid_path_bits = 0;
669 wc->port_num = port_num;
670}
671
672/*
673 * Return 0 if SMP is to be sent
674 * Return 1 if SMP was consumed locally (whether or not solicited)
675 * Return < 0 if error
676 */
677static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
678 struct ib_mad_send_wr_private *mad_send_wr)
679{
680 int ret = 0;
681 struct ib_smp *smp = mad_send_wr->send_buf.mad;
682 unsigned long flags;
683 struct ib_mad_local_private *local;
684 struct ib_mad_private *mad_priv;
685 struct ib_mad_port_private *port_priv;
686 struct ib_mad_agent_private *recv_mad_agent = NULL;
687 struct ib_device *device = mad_agent_priv->agent.device;
688 u8 port_num;
689 struct ib_wc mad_wc;
690 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
691
692 if (device->node_type == RDMA_NODE_IB_SWITCH &&
693 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
694 port_num = send_wr->wr.ud.port_num;
695 else
696 port_num = mad_agent_priv->agent.port_num;
697
698 /*
699 * Directed route handling starts if the initial LID routed part of
700 * a request or the ending LID routed part of a response is empty.
701 * If we are at the start of the LID routed part, don't update the
702 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
703 */
704 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
705 IB_LID_PERMISSIVE &&
706 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
707 IB_SMI_DISCARD) {
708 ret = -EINVAL;
709 printk(KERN_ERR PFX "Invalid directed route\n");
710 goto out;
711 }
712
713 /* Check to post send on QP or process locally */
714 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
715 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
716 goto out;
717
718 local = kmalloc(sizeof *local, GFP_ATOMIC);
719 if (!local) {
720 ret = -ENOMEM;
721 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
722 goto out;
723 }
724 local->mad_priv = NULL;
725 local->recv_mad_agent = NULL;
726 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
727 if (!mad_priv) {
728 ret = -ENOMEM;
729 printk(KERN_ERR PFX "No memory for local response MAD\n");
730 kfree(local);
731 goto out;
732 }
733
734 build_smp_wc(mad_agent_priv->agent.qp,
735 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
736 send_wr->wr.ud.pkey_index,
737 send_wr->wr.ud.port_num, &mad_wc);
738
739 /* No GRH for DR SMP */
740 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
741 (struct ib_mad *)smp,
742 (struct ib_mad *)&mad_priv->mad);
743 switch (ret)
744 {
745 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
746 if (ib_response_mad(&mad_priv->mad.mad) &&
747 mad_agent_priv->agent.recv_handler) {
748 local->mad_priv = mad_priv;
749 local->recv_mad_agent = mad_agent_priv;
750 /*
751 * Reference MAD agent until receive
752 * side of local completion handled
753 */
754 atomic_inc(&mad_agent_priv->refcount);
755 } else
756 kmem_cache_free(ib_mad_cache, mad_priv);
757 break;
758 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
759 kmem_cache_free(ib_mad_cache, mad_priv);
760 break;
761 case IB_MAD_RESULT_SUCCESS:
762 /* Treat like an incoming receive MAD */
763 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
764 mad_agent_priv->agent.port_num);
765 if (port_priv) {
766 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
767 recv_mad_agent = find_mad_agent(port_priv,
768 &mad_priv->mad.mad);
769 }
770 if (!port_priv || !recv_mad_agent) {
771 /*
772 * No receiving agent so drop packet and
773 * generate send completion.
774 */
775 kmem_cache_free(ib_mad_cache, mad_priv);
776 break;
777 }
778 local->mad_priv = mad_priv;
779 local->recv_mad_agent = recv_mad_agent;
780 break;
781 default:
782 kmem_cache_free(ib_mad_cache, mad_priv);
783 kfree(local);
784 ret = -EINVAL;
785 goto out;
786 }
787
788 local->mad_send_wr = mad_send_wr;
789 /* Reference MAD agent until send side of local completion handled */
790 atomic_inc(&mad_agent_priv->refcount);
791 /* Queue local completion to local list */
792 spin_lock_irqsave(&mad_agent_priv->lock, flags);
793 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
794 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
795 queue_work(mad_agent_priv->qp_info->port_priv->wq,
796 &mad_agent_priv->local_work);
797 ret = 1;
798out:
799 return ret;
800}
801
802static int get_pad_size(int hdr_len, int data_len)
803{
804 int seg_size, pad;
805
806 seg_size = sizeof(struct ib_mad) - hdr_len;
807 if (data_len && seg_size) {
808 pad = seg_size - data_len % seg_size;
809 return pad == seg_size ? 0 : pad;
810 } else
811 return seg_size;
812}
813
814static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
815{
816 struct ib_rmpp_segment *s, *t;
817
818 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
819 list_del(&s->list);
820 kfree(s);
821 }
822}
823
824static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
825 gfp_t gfp_mask)
826{
827 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
828 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
829 struct ib_rmpp_segment *seg = NULL;
830 int left, seg_size, pad;
831
832 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
833 seg_size = send_buf->seg_size;
834 pad = send_wr->pad;
835
836 /* Allocate data segments. */
837 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
838 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
839 if (!seg) {
840 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
841 "alloc failed for len %zd, gfp %#x\n",
842 sizeof (*seg) + seg_size, gfp_mask);
843 free_send_rmpp_list(send_wr);
844 return -ENOMEM;
845 }
846 seg->num = ++send_buf->seg_count;
847 list_add_tail(&seg->list, &send_wr->rmpp_list);
848 }
849
850 /* Zero any padding */
851 if (pad)
852 memset(seg->data + seg_size - pad, 0, pad);
853
854 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
855 agent.rmpp_version;
856 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
857 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
858
859 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
860 struct ib_rmpp_segment, list);
861 send_wr->last_ack_seg = send_wr->cur_seg;
862 return 0;
863}
864
865struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
866 u32 remote_qpn, u16 pkey_index,
867 int rmpp_active,
868 int hdr_len, int data_len,
869 gfp_t gfp_mask)
870{
871 struct ib_mad_agent_private *mad_agent_priv;
872 struct ib_mad_send_wr_private *mad_send_wr;
873 int pad, message_size, ret, size;
874 void *buf;
875
876 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
877 agent);
878 pad = get_pad_size(hdr_len, data_len);
879 message_size = hdr_len + data_len + pad;
880
881 if ((!mad_agent->rmpp_version &&
882 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
883 (!rmpp_active && message_size > sizeof(struct ib_mad)))
884 return ERR_PTR(-EINVAL);
885
886 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
887 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
888 if (!buf)
889 return ERR_PTR(-ENOMEM);
890
891 mad_send_wr = buf + size;
892 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
893 mad_send_wr->send_buf.mad = buf;
894 mad_send_wr->send_buf.hdr_len = hdr_len;
895 mad_send_wr->send_buf.data_len = data_len;
896 mad_send_wr->pad = pad;
897
898 mad_send_wr->mad_agent_priv = mad_agent_priv;
899 mad_send_wr->sg_list[0].length = hdr_len;
900 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
901 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
902 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
903
904 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
905 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
906 mad_send_wr->send_wr.num_sge = 2;
907 mad_send_wr->send_wr.opcode = IB_WR_SEND;
908 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
909 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
910 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
911 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
912
913 if (rmpp_active) {
914 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
915 if (ret) {
916 kfree(buf);
917 return ERR_PTR(ret);
918 }
919 }
920
921 mad_send_wr->send_buf.mad_agent = mad_agent;
922 atomic_inc(&mad_agent_priv->refcount);
923 return &mad_send_wr->send_buf;
924}
925EXPORT_SYMBOL(ib_create_send_mad);
926
927int ib_get_mad_data_offset(u8 mgmt_class)
928{
929 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
930 return IB_MGMT_SA_HDR;
931 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
932 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
933 (mgmt_class == IB_MGMT_CLASS_BIS))
934 return IB_MGMT_DEVICE_HDR;
935 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
936 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
937 return IB_MGMT_VENDOR_HDR;
938 else
939 return IB_MGMT_MAD_HDR;
940}
941EXPORT_SYMBOL(ib_get_mad_data_offset);
942
943int ib_is_mad_class_rmpp(u8 mgmt_class)
944{
945 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
946 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
947 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
948 (mgmt_class == IB_MGMT_CLASS_BIS) ||
949 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
950 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
951 return 1;
952 return 0;
953}
954EXPORT_SYMBOL(ib_is_mad_class_rmpp);
955
956void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
957{
958 struct ib_mad_send_wr_private *mad_send_wr;
959 struct list_head *list;
960
961 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
962 send_buf);
963 list = &mad_send_wr->cur_seg->list;
964
965 if (mad_send_wr->cur_seg->num < seg_num) {
966 list_for_each_entry(mad_send_wr->cur_seg, list, list)
967 if (mad_send_wr->cur_seg->num == seg_num)
968 break;
969 } else if (mad_send_wr->cur_seg->num > seg_num) {
970 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
971 if (mad_send_wr->cur_seg->num == seg_num)
972 break;
973 }
974 return mad_send_wr->cur_seg->data;
975}
976EXPORT_SYMBOL(ib_get_rmpp_segment);
977
978static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
979{
980 if (mad_send_wr->send_buf.seg_count)
981 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
982 mad_send_wr->seg_num);
983 else
984 return mad_send_wr->send_buf.mad +
985 mad_send_wr->send_buf.hdr_len;
986}
987
988void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
989{
990 struct ib_mad_agent_private *mad_agent_priv;
991 struct ib_mad_send_wr_private *mad_send_wr;
992
993 mad_agent_priv = container_of(send_buf->mad_agent,
994 struct ib_mad_agent_private, agent);
995 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
996 send_buf);
997
998 free_send_rmpp_list(mad_send_wr);
999 kfree(send_buf->mad);
1000 deref_mad_agent(mad_agent_priv);
1001}
1002EXPORT_SYMBOL(ib_free_send_mad);
1003
1004int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1005{
1006 struct ib_mad_qp_info *qp_info;
1007 struct list_head *list;
1008 struct ib_send_wr *bad_send_wr;
1009 struct ib_mad_agent *mad_agent;
1010 struct ib_sge *sge;
1011 unsigned long flags;
1012 int ret;
1013
1014 /* Set WR ID to find mad_send_wr upon completion */
1015 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1016 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1017 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1018
1019 mad_agent = mad_send_wr->send_buf.mad_agent;
1020 sge = mad_send_wr->sg_list;
1021 sge[0].addr = ib_dma_map_single(mad_agent->device,
1022 mad_send_wr->send_buf.mad,
1023 sge[0].length,
1024 DMA_TO_DEVICE);
1025 mad_send_wr->header_mapping = sge[0].addr;
1026
1027 sge[1].addr = ib_dma_map_single(mad_agent->device,
1028 ib_get_payload(mad_send_wr),
1029 sge[1].length,
1030 DMA_TO_DEVICE);
1031 mad_send_wr->payload_mapping = sge[1].addr;
1032
1033 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1034 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1035 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1036 &bad_send_wr);
1037 list = &qp_info->send_queue.list;
1038 } else {
1039 ret = 0;
1040 list = &qp_info->overflow_list;
1041 }
1042
1043 if (!ret) {
1044 qp_info->send_queue.count++;
1045 list_add_tail(&mad_send_wr->mad_list.list, list);
1046 }
1047 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1048 if (ret) {
1049 ib_dma_unmap_single(mad_agent->device,
1050 mad_send_wr->header_mapping,
1051 sge[0].length, DMA_TO_DEVICE);
1052 ib_dma_unmap_single(mad_agent->device,
1053 mad_send_wr->payload_mapping,
1054 sge[1].length, DMA_TO_DEVICE);
1055 }
1056 return ret;
1057}
1058
1059/*
1060 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1061 * with the registered client
1062 */
1063int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1064 struct ib_mad_send_buf **bad_send_buf)
1065{
1066 struct ib_mad_agent_private *mad_agent_priv;
1067 struct ib_mad_send_buf *next_send_buf;
1068 struct ib_mad_send_wr_private *mad_send_wr;
1069 unsigned long flags;
1070 int ret = -EINVAL;
1071
1072 /* Walk list of send WRs and post each on send list */
1073 for (; send_buf; send_buf = next_send_buf) {
1074
1075 mad_send_wr = container_of(send_buf,
1076 struct ib_mad_send_wr_private,
1077 send_buf);
1078 mad_agent_priv = mad_send_wr->mad_agent_priv;
1079
1080 if (!send_buf->mad_agent->send_handler ||
1081 (send_buf->timeout_ms &&
1082 !send_buf->mad_agent->recv_handler)) {
1083 ret = -EINVAL;
1084 goto error;
1085 }
1086
1087 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1088 if (mad_agent_priv->agent.rmpp_version) {
1089 ret = -EINVAL;
1090 goto error;
1091 }
1092 }
1093
1094 /*
1095 * Save pointer to next work request to post in case the
1096 * current one completes, and the user modifies the work
1097 * request associated with the completion
1098 */
1099 next_send_buf = send_buf->next;
1100 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1101
1102 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1103 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1104 ret = handle_outgoing_dr_smp(mad_agent_priv,
1105 mad_send_wr);
1106 if (ret < 0) /* error */
1107 goto error;
1108 else if (ret == 1) /* locally consumed */
1109 continue;
1110 }
1111
1112 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1113 /* Timeout will be updated after send completes */
1114 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1115 mad_send_wr->max_retries = send_buf->retries;
1116 mad_send_wr->retries_left = send_buf->retries;
1117 send_buf->retries = 0;
1118 /* Reference for work request to QP + response */
1119 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1120 mad_send_wr->status = IB_WC_SUCCESS;
1121
1122 /* Reference MAD agent until send completes */
1123 atomic_inc(&mad_agent_priv->refcount);
1124 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1125 list_add_tail(&mad_send_wr->agent_list,
1126 &mad_agent_priv->send_list);
1127 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1128
1129 if (mad_agent_priv->agent.rmpp_version) {
1130 ret = ib_send_rmpp_mad(mad_send_wr);
1131 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1132 ret = ib_send_mad(mad_send_wr);
1133 } else
1134 ret = ib_send_mad(mad_send_wr);
1135 if (ret < 0) {
1136 /* Fail send request */
1137 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1138 list_del(&mad_send_wr->agent_list);
1139 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1140 atomic_dec(&mad_agent_priv->refcount);
1141 goto error;
1142 }
1143 }
1144 return 0;
1145error:
1146 if (bad_send_buf)
1147 *bad_send_buf = send_buf;
1148 return ret;
1149}
1150EXPORT_SYMBOL(ib_post_send_mad);
1151
1152/*
1153 * ib_free_recv_mad - Returns data buffers used to receive
1154 * a MAD to the access layer
1155 */
1156void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1157{
1158 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1159 struct ib_mad_private_header *mad_priv_hdr;
1160 struct ib_mad_private *priv;
1161 struct list_head free_list;
1162
1163 INIT_LIST_HEAD(&free_list);
1164 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1165
1166 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1167 &free_list, list) {
1168 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1169 recv_buf);
1170 mad_priv_hdr = container_of(mad_recv_wc,
1171 struct ib_mad_private_header,
1172 recv_wc);
1173 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1174 header);
1175 kmem_cache_free(ib_mad_cache, priv);
1176 }
1177}
1178EXPORT_SYMBOL(ib_free_recv_mad);
1179
1180struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1181 u8 rmpp_version,
1182 ib_mad_send_handler send_handler,
1183 ib_mad_recv_handler recv_handler,
1184 void *context)
1185{
1186 return ERR_PTR(-EINVAL); /* XXX: for now */
1187}
1188EXPORT_SYMBOL(ib_redirect_mad_qp);
1189
1190int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1191 struct ib_wc *wc)
1192{
1193 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1194 return 0;
1195}
1196EXPORT_SYMBOL(ib_process_mad_wc);
1197
1198static int method_in_use(struct ib_mad_mgmt_method_table **method,
1199 struct ib_mad_reg_req *mad_reg_req)
1200{
1201 int i;
1202
1203 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1204 if ((*method)->agent[i]) {
1205 printk(KERN_ERR PFX "Method %d already in use\n", i);
1206 return -EINVAL;
1207 }
1208 }
1209 return 0;
1210}
1211
1212static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1213{
1214 /* Allocate management method table */
1215 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1216 if (!*method) {
1217 printk(KERN_ERR PFX "No memory for "
1218 "ib_mad_mgmt_method_table\n");
1219 return -ENOMEM;
1220 }
1221
1222 return 0;
1223}
1224
1225/*
1226 * Check to see if there are any methods still in use
1227 */
1228static int check_method_table(struct ib_mad_mgmt_method_table *method)
1229{
1230 int i;
1231
1232 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1233 if (method->agent[i])
1234 return 1;
1235 return 0;
1236}
1237
1238/*
1239 * Check to see if there are any method tables for this class still in use
1240 */
1241static int check_class_table(struct ib_mad_mgmt_class_table *class)
1242{
1243 int i;
1244
1245 for (i = 0; i < MAX_MGMT_CLASS; i++)
1246 if (class->method_table[i])
1247 return 1;
1248 return 0;
1249}
1250
1251static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1252{
1253 int i;
1254
1255 for (i = 0; i < MAX_MGMT_OUI; i++)
1256 if (vendor_class->method_table[i])
1257 return 1;
1258 return 0;
1259}
1260
1261static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1262 char *oui)
1263{
1264 int i;
1265
1266 for (i = 0; i < MAX_MGMT_OUI; i++)
1267 /* Is there matching OUI for this vendor class ? */
1268 if (!memcmp(vendor_class->oui[i], oui, 3))
1269 return i;
1270
1271 return -1;
1272}
1273
1274static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1275{
1276 int i;
1277
1278 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1279 if (vendor->vendor_class[i])
1280 return 1;
1281
1282 return 0;
1283}
1284
1285static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1286 struct ib_mad_agent_private *agent)
1287{
1288 int i;
1289
1290 /* Remove any methods for this mad agent */
1291 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1292 if (method->agent[i] == agent) {
1293 method->agent[i] = NULL;
1294 }
1295 }
1296}
1297
1298static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1299 struct ib_mad_agent_private *agent_priv,
1300 u8 mgmt_class)
1301{
1302 struct ib_mad_port_private *port_priv;
1303 struct ib_mad_mgmt_class_table **class;
1304 struct ib_mad_mgmt_method_table **method;
1305 int i, ret;
1306
1307 port_priv = agent_priv->qp_info->port_priv;
1308 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1309 if (!*class) {
1310 /* Allocate management class table for "new" class version */
1311 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1312 if (!*class) {
1313 printk(KERN_ERR PFX "No memory for "
1314 "ib_mad_mgmt_class_table\n");
1315 ret = -ENOMEM;
1316 goto error1;
1317 }
1318
1319 /* Allocate method table for this management class */
1320 method = &(*class)->method_table[mgmt_class];
1321 if ((ret = allocate_method_table(method)))
1322 goto error2;
1323 } else {
1324 method = &(*class)->method_table[mgmt_class];
1325 if (!*method) {
1326 /* Allocate method table for this management class */
1327 if ((ret = allocate_method_table(method)))
1328 goto error1;
1329 }
1330 }
1331
1332 /* Now, make sure methods are not already in use */
1333 if (method_in_use(method, mad_reg_req))
1334 goto error3;
1335
1336 /* Finally, add in methods being registered */
1337 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1338 (*method)->agent[i] = agent_priv;
1339
1340 return 0;
1341
1342error3:
1343 /* Remove any methods for this mad agent */
1344 remove_methods_mad_agent(*method, agent_priv);
1345 /* Now, check to see if there are any methods in use */
1346 if (!check_method_table(*method)) {
1347 /* If not, release management method table */
1348 kfree(*method);
1349 *method = NULL;
1350 }
1351 ret = -EINVAL;
1352 goto error1;
1353error2:
1354 kfree(*class);
1355 *class = NULL;
1356error1:
1357 return ret;
1358}
1359
1360static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1361 struct ib_mad_agent_private *agent_priv)
1362{
1363 struct ib_mad_port_private *port_priv;
1364 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1365 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1366 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1367 struct ib_mad_mgmt_method_table **method;
1368 int i, ret = -ENOMEM;
1369 u8 vclass;
1370
1371 /* "New" vendor (with OUI) class */
1372 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1373 port_priv = agent_priv->qp_info->port_priv;
1374 vendor_table = &port_priv->version[
1375 mad_reg_req->mgmt_class_version].vendor;
1376 if (!*vendor_table) {
1377 /* Allocate mgmt vendor class table for "new" class version */
1378 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1379 if (!vendor) {
1380 printk(KERN_ERR PFX "No memory for "
1381 "ib_mad_mgmt_vendor_class_table\n");
1382 goto error1;
1383 }
1384
1385 *vendor_table = vendor;
1386 }
1387 if (!(*vendor_table)->vendor_class[vclass]) {
1388 /* Allocate table for this management vendor class */
1389 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1390 if (!vendor_class) {
1391 printk(KERN_ERR PFX "No memory for "
1392 "ib_mad_mgmt_vendor_class\n");
1393 goto error2;
1394 }
1395
1396 (*vendor_table)->vendor_class[vclass] = vendor_class;
1397 }
1398 for (i = 0; i < MAX_MGMT_OUI; i++) {
1399 /* Is there matching OUI for this vendor class ? */
1400 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1401 mad_reg_req->oui, 3)) {
1402 method = &(*vendor_table)->vendor_class[
1403 vclass]->method_table[i];
1404 BUG_ON(!*method);
1405 goto check_in_use;
1406 }
1407 }
1408 for (i = 0; i < MAX_MGMT_OUI; i++) {
1409 /* OUI slot available ? */
1410 if (!is_vendor_oui((*vendor_table)->vendor_class[
1411 vclass]->oui[i])) {
1412 method = &(*vendor_table)->vendor_class[
1413 vclass]->method_table[i];
1414 BUG_ON(*method);
1415 /* Allocate method table for this OUI */
1416 if ((ret = allocate_method_table(method)))
1417 goto error3;
1418 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1419 mad_reg_req->oui, 3);
1420 goto check_in_use;
1421 }
1422 }
1423 printk(KERN_ERR PFX "All OUI slots in use\n");
1424 goto error3;
1425
1426check_in_use:
1427 /* Now, make sure methods are not already in use */
1428 if (method_in_use(method, mad_reg_req))
1429 goto error4;
1430
1431 /* Finally, add in methods being registered */
1432 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1433 (*method)->agent[i] = agent_priv;
1434
1435 return 0;
1436
1437error4:
1438 /* Remove any methods for this mad agent */
1439 remove_methods_mad_agent(*method, agent_priv);
1440 /* Now, check to see if there are any methods in use */
1441 if (!check_method_table(*method)) {
1442 /* If not, release management method table */
1443 kfree(*method);
1444 *method = NULL;
1445 }
1446 ret = -EINVAL;
1447error3:
1448 if (vendor_class) {
1449 (*vendor_table)->vendor_class[vclass] = NULL;
1450 kfree(vendor_class);
1451 }
1452error2:
1453 if (vendor) {
1454 *vendor_table = NULL;
1455 kfree(vendor);
1456 }
1457error1:
1458 return ret;
1459}
1460
1461static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1462{
1463 struct ib_mad_port_private *port_priv;
1464 struct ib_mad_mgmt_class_table *class;
1465 struct ib_mad_mgmt_method_table *method;
1466 struct ib_mad_mgmt_vendor_class_table *vendor;
1467 struct ib_mad_mgmt_vendor_class *vendor_class;
1468 int index;
1469 u8 mgmt_class;
1470
1471 /*
1472 * Was MAD registration request supplied
1473 * with original registration ?
1474 */
1475 if (!agent_priv->reg_req) {
1476 goto out;
1477 }
1478
1479 port_priv = agent_priv->qp_info->port_priv;
1480 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1481 class = port_priv->version[
1482 agent_priv->reg_req->mgmt_class_version].class;
1483 if (!class)
1484 goto vendor_check;
1485
1486 method = class->method_table[mgmt_class];
1487 if (method) {
1488 /* Remove any methods for this mad agent */
1489 remove_methods_mad_agent(method, agent_priv);
1490 /* Now, check to see if there are any methods still in use */
1491 if (!check_method_table(method)) {
1492 /* If not, release management method table */
1493 kfree(method);
1494 class->method_table[mgmt_class] = NULL;
1495 /* Any management classes left ? */
1496 if (!check_class_table(class)) {
1497 /* If not, release management class table */
1498 kfree(class);
1499 port_priv->version[
1500 agent_priv->reg_req->
1501 mgmt_class_version].class = NULL;
1502 }
1503 }
1504 }
1505
1506vendor_check:
1507 if (!is_vendor_class(mgmt_class))
1508 goto out;
1509
1510 /* normalize mgmt_class to vendor range 2 */
1511 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1512 vendor = port_priv->version[
1513 agent_priv->reg_req->mgmt_class_version].vendor;
1514
1515 if (!vendor)
1516 goto out;
1517
1518 vendor_class = vendor->vendor_class[mgmt_class];
1519 if (vendor_class) {
1520 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1521 if (index < 0)
1522 goto out;
1523 method = vendor_class->method_table[index];
1524 if (method) {
1525 /* Remove any methods for this mad agent */
1526 remove_methods_mad_agent(method, agent_priv);
1527 /*
1528 * Now, check to see if there are
1529 * any methods still in use
1530 */
1531 if (!check_method_table(method)) {
1532 /* If not, release management method table */
1533 kfree(method);
1534 vendor_class->method_table[index] = NULL;
1535 memset(vendor_class->oui[index], 0, 3);
1536 /* Any OUIs left ? */
1537 if (!check_vendor_class(vendor_class)) {
1538 /* If not, release vendor class table */
1539 kfree(vendor_class);
1540 vendor->vendor_class[mgmt_class] = NULL;
1541 /* Any other vendor classes left ? */
1542 if (!check_vendor_table(vendor)) {
1543 kfree(vendor);
1544 port_priv->version[
1545 agent_priv->reg_req->
1546 mgmt_class_version].
1547 vendor = NULL;
1548 }
1549 }
1550 }
1551 }
1552 }
1553
1554out:
1555 return;
1556}
1557
1558static struct ib_mad_agent_private *
1559find_mad_agent(struct ib_mad_port_private *port_priv,
1560 struct ib_mad *mad)
1561{
1562 struct ib_mad_agent_private *mad_agent = NULL;
1563 unsigned long flags;
1564
1565 spin_lock_irqsave(&port_priv->reg_lock, flags);
1566 if (ib_response_mad(mad)) {
1567 u32 hi_tid;
1568 struct ib_mad_agent_private *entry;
1569
1570 /*
1571 * Routing is based on high 32 bits of transaction ID
1572 * of MAD.
1573 */
1574 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1575 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1576 if (entry->agent.hi_tid == hi_tid) {
1577 mad_agent = entry;
1578 break;
1579 }
1580 }
1581 } else {
1582 struct ib_mad_mgmt_class_table *class;
1583 struct ib_mad_mgmt_method_table *method;
1584 struct ib_mad_mgmt_vendor_class_table *vendor;
1585 struct ib_mad_mgmt_vendor_class *vendor_class;
1586 struct ib_vendor_mad *vendor_mad;
1587 int index;
1588
1589 /*
1590 * Routing is based on version, class, and method
1591 * For "newer" vendor MADs, also based on OUI
1592 */
1593 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1594 goto out;
1595 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1596 class = port_priv->version[
1597 mad->mad_hdr.class_version].class;
1598 if (!class)
1599 goto out;
1600 if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
1601 IB_MGMT_MAX_METHODS)
1602 goto out;
1603 method = class->method_table[convert_mgmt_class(
1604 mad->mad_hdr.mgmt_class)];
1605 if (method)
1606 mad_agent = method->agent[mad->mad_hdr.method &
1607 ~IB_MGMT_METHOD_RESP];
1608 } else {
1609 vendor = port_priv->version[
1610 mad->mad_hdr.class_version].vendor;
1611 if (!vendor)
1612 goto out;
1613 vendor_class = vendor->vendor_class[vendor_class_index(
1614 mad->mad_hdr.mgmt_class)];
1615 if (!vendor_class)
1616 goto out;
1617 /* Find matching OUI */
1618 vendor_mad = (struct ib_vendor_mad *)mad;
1619 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1620 if (index == -1)
1621 goto out;
1622 method = vendor_class->method_table[index];
1623 if (method) {
1624 mad_agent = method->agent[mad->mad_hdr.method &
1625 ~IB_MGMT_METHOD_RESP];
1626 }
1627 }
1628 }
1629
1630 if (mad_agent) {
1631 if (mad_agent->agent.recv_handler)
1632 atomic_inc(&mad_agent->refcount);
1633 else {
1634 printk(KERN_NOTICE PFX "No receive handler for client "
1635 "%p on port %d\n",
1636 &mad_agent->agent, port_priv->port_num);
1637 mad_agent = NULL;
1638 }
1639 }
1640out:
1641 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1642
1643 return mad_agent;
1644}
1645
1646static int validate_mad(struct ib_mad *mad, u32 qp_num)
1647{
1648 int valid = 0;
1649
1650 /* Make sure MAD base version is understood */
1651 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1652 printk(KERN_ERR PFX "MAD received with unsupported base "
1653 "version %d\n", mad->mad_hdr.base_version);
1654 goto out;
1655 }
1656
1657 /* Filter SMI packets sent to other than QP0 */
1658 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1659 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1660 if (qp_num == 0)
1661 valid = 1;
1662 } else {
1663 /* Filter GSI packets sent to QP0 */
1664 if (qp_num != 0)
1665 valid = 1;
1666 }
1667
1668out:
1669 return valid;
1670}
1671
1672static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1673 struct ib_mad_hdr *mad_hdr)
1674{
1675 struct ib_rmpp_mad *rmpp_mad;
1676
1677 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1678 return !mad_agent_priv->agent.rmpp_version ||
1679 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1680 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1681 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1682}
1683
1684static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1685 struct ib_mad_recv_wc *rwc)
1686{
1687 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1688 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1689}
1690
1691static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1692 struct ib_mad_send_wr_private *wr,
1693 struct ib_mad_recv_wc *rwc )
1694{
1695 struct ib_ah_attr attr;
1696 u8 send_resp, rcv_resp;
1697 union ib_gid sgid;
1698 struct ib_device *device = mad_agent_priv->agent.device;
1699 u8 port_num = mad_agent_priv->agent.port_num;
1700 u8 lmc;
1701
1702 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1703 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1704
1705 if (send_resp == rcv_resp)
1706 /* both requests, or both responses. GIDs different */
1707 return 0;
1708
1709 if (ib_query_ah(wr->send_buf.ah, &attr))
1710 /* Assume not equal, to avoid false positives. */
1711 return 0;
1712
1713 if (!!(attr.ah_flags & IB_AH_GRH) !=
1714 !!(rwc->wc->wc_flags & IB_WC_GRH))
1715 /* one has GID, other does not. Assume different */
1716 return 0;
1717
1718 if (!send_resp && rcv_resp) {
1719 /* is request/response. */
1720 if (!(attr.ah_flags & IB_AH_GRH)) {
1721 if (ib_get_cached_lmc(device, port_num, &lmc))
1722 return 0;
1723 return (!lmc || !((attr.src_path_bits ^
1724 rwc->wc->dlid_path_bits) &
1725 ((1 << lmc) - 1)));
1726 } else {
1727 if (ib_get_cached_gid(device, port_num,
1728 attr.grh.sgid_index, &sgid))
1729 return 0;
1730 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1731 16);
1732 }
1733 }
1734
1735 if (!(attr.ah_flags & IB_AH_GRH))
1736 return attr.dlid == rwc->wc->slid;
1737 else
1738 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1739 16);
1740}
1741
1742static inline int is_direct(u8 class)
1743{
1744 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1745}
1746
1747struct ib_mad_send_wr_private*
1748ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1749 struct ib_mad_recv_wc *wc)
1750{
1751 struct ib_mad_send_wr_private *wr;
1752 struct ib_mad *mad;
1753
1754 mad = (struct ib_mad *)wc->recv_buf.mad;
1755
1756 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1757 if ((wr->tid == mad->mad_hdr.tid) &&
1758 rcv_has_same_class(wr, wc) &&
1759 /*
1760 * Don't check GID for direct routed MADs.
1761 * These might have permissive LIDs.
1762 */
1763 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1764 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1765 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1766 }
1767
1768 /*
1769 * It's possible to receive the response before we've
1770 * been notified that the send has completed
1771 */
1772 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1773 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1774 wr->tid == mad->mad_hdr.tid &&
1775 wr->timeout &&
1776 rcv_has_same_class(wr, wc) &&
1777 /*
1778 * Don't check GID for direct routed MADs.
1779 * These might have permissive LIDs.
1780 */
1781 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1782 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1783 /* Verify request has not been canceled */
1784 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1785 }
1786 return NULL;
1787}
1788
1789void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1790{
1791 mad_send_wr->timeout = 0;
1792 if (mad_send_wr->refcount == 1)
1793 list_move_tail(&mad_send_wr->agent_list,
1794 &mad_send_wr->mad_agent_priv->done_list);
1795}
1796
1797static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1798 struct ib_mad_recv_wc *mad_recv_wc)
1799{
1800 struct ib_mad_send_wr_private *mad_send_wr;
1801 struct ib_mad_send_wc mad_send_wc;
1802 unsigned long flags;
1803
1804 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1805 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1806 if (mad_agent_priv->agent.rmpp_version) {
1807 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1808 mad_recv_wc);
1809 if (!mad_recv_wc) {
1810 deref_mad_agent(mad_agent_priv);
1811 return;
1812 }
1813 }
1814
1815 /* Complete corresponding request */
1816 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1817 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1818 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1819 if (!mad_send_wr) {
1820 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1821 ib_free_recv_mad(mad_recv_wc);
1822 deref_mad_agent(mad_agent_priv);
1823 return;
1824 }
1825 ib_mark_mad_done(mad_send_wr);
1826 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1827
1828 /* Defined behavior is to complete response before request */
1829 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1830 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1831 mad_recv_wc);
1832 atomic_dec(&mad_agent_priv->refcount);
1833
1834 mad_send_wc.status = IB_WC_SUCCESS;
1835 mad_send_wc.vendor_err = 0;
1836 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1837 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1838 } else {
1839 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1840 mad_recv_wc);
1841 deref_mad_agent(mad_agent_priv);
1842 }
1843}
1844
1845static bool generate_unmatched_resp(struct ib_mad_private *recv,
1846 struct ib_mad_private *response)
1847{
1848 if (recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_GET ||
1849 recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_SET) {
1850 memcpy(response, recv, sizeof *response);
1851 response->header.recv_wc.wc = &response->header.wc;
1852 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1853 response->header.recv_wc.recv_buf.grh = &response->grh;
1854 response->mad.mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
1855 response->mad.mad.mad_hdr.status =
1856 cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1857 if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1858 response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION;
1859
1860 return true;
1861 } else {
1862 return false;
1863 }
1864}
1865static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1866 struct ib_wc *wc)
1867{
1868 struct ib_mad_qp_info *qp_info;
1869 struct ib_mad_private_header *mad_priv_hdr;
1870 struct ib_mad_private *recv, *response = NULL;
1871 struct ib_mad_list_head *mad_list;
1872 struct ib_mad_agent_private *mad_agent;
1873 int port_num;
1874 int ret = IB_MAD_RESULT_SUCCESS;
1875
1876 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1877 qp_info = mad_list->mad_queue->qp_info;
1878 dequeue_mad(mad_list);
1879
1880 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1881 mad_list);
1882 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1883 ib_dma_unmap_single(port_priv->device,
1884 recv->header.mapping,
1885 sizeof(struct ib_mad_private) -
1886 sizeof(struct ib_mad_private_header),
1887 DMA_FROM_DEVICE);
1888
1889 /* Setup MAD receive work completion from "normal" work completion */
1890 recv->header.wc = *wc;
1891 recv->header.recv_wc.wc = &recv->header.wc;
1892 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1893 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1894 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1895
1896 if (atomic_read(&qp_info->snoop_count))
1897 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1898
1899 /* Validate MAD */
1900 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1901 goto out;
1902
1903 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1904 if (!response) {
1905 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1906 "for response buffer\n");
1907 goto out;
1908 }
1909
1910 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1911 port_num = wc->port_num;
1912 else
1913 port_num = port_priv->port_num;
1914
1915 if (recv->mad.mad.mad_hdr.mgmt_class ==
1916 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1917 enum smi_forward_action retsmi;
1918
1919 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1920 port_priv->device->node_type,
1921 port_num,
1922 port_priv->device->phys_port_cnt) ==
1923 IB_SMI_DISCARD)
1924 goto out;
1925
1926 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1927 if (retsmi == IB_SMI_LOCAL)
1928 goto local;
1929
1930 if (retsmi == IB_SMI_SEND) { /* don't forward */
1931 if (smi_handle_dr_smp_send(&recv->mad.smp,
1932 port_priv->device->node_type,
1933 port_num) == IB_SMI_DISCARD)
1934 goto out;
1935
1936 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1937 goto out;
1938 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1939 /* forward case for switches */
1940 memcpy(response, recv, sizeof(*response));
1941 response->header.recv_wc.wc = &response->header.wc;
1942 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1943 response->header.recv_wc.recv_buf.grh = &response->grh;
1944
1945 agent_send_response(&response->mad.mad,
1946 &response->grh, wc,
1947 port_priv->device,
1948 smi_get_fwd_port(&recv->mad.smp),
1949 qp_info->qp->qp_num);
1950
1951 goto out;
1952 }
1953 }
1954
1955local:
1956 /* Give driver "right of first refusal" on incoming MAD */
1957 if (port_priv->device->process_mad) {
1958 ret = port_priv->device->process_mad(port_priv->device, 0,
1959 port_priv->port_num,
1960 wc, &recv->grh,
1961 &recv->mad.mad,
1962 &response->mad.mad);
1963 if (ret & IB_MAD_RESULT_SUCCESS) {
1964 if (ret & IB_MAD_RESULT_CONSUMED)
1965 goto out;
1966 if (ret & IB_MAD_RESULT_REPLY) {
1967 agent_send_response(&response->mad.mad,
1968 &recv->grh, wc,
1969 port_priv->device,
1970 port_num,
1971 qp_info->qp->qp_num);
1972 goto out;
1973 }
1974 }
1975 }
1976
1977 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1978 if (mad_agent) {
1979 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1980 /*
1981 * recv is freed up in error cases in ib_mad_complete_recv
1982 * or via recv_handler in ib_mad_complete_recv()
1983 */
1984 recv = NULL;
1985 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
1986 generate_unmatched_resp(recv, response)) {
1987 agent_send_response(&response->mad.mad, &recv->grh, wc,
1988 port_priv->device, port_num, qp_info->qp->qp_num);
1989 }
1990
1991out:
1992 /* Post another receive request for this QP */
1993 if (response) {
1994 ib_mad_post_receive_mads(qp_info, response);
1995 if (recv)
1996 kmem_cache_free(ib_mad_cache, recv);
1997 } else
1998 ib_mad_post_receive_mads(qp_info, recv);
1999}
2000
2001static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2002{
2003 struct ib_mad_send_wr_private *mad_send_wr;
2004 unsigned long delay;
2005
2006 if (list_empty(&mad_agent_priv->wait_list)) {
2007 __cancel_delayed_work(&mad_agent_priv->timed_work);
2008 } else {
2009 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2010 struct ib_mad_send_wr_private,
2011 agent_list);
2012
2013 if (time_after(mad_agent_priv->timeout,
2014 mad_send_wr->timeout)) {
2015 mad_agent_priv->timeout = mad_send_wr->timeout;
2016 __cancel_delayed_work(&mad_agent_priv->timed_work);
2017 delay = mad_send_wr->timeout - jiffies;
2018 if ((long)delay <= 0)
2019 delay = 1;
2020 queue_delayed_work(mad_agent_priv->qp_info->
2021 port_priv->wq,
2022 &mad_agent_priv->timed_work, delay);
2023 }
2024 }
2025}
2026
2027static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2028{
2029 struct ib_mad_agent_private *mad_agent_priv;
2030 struct ib_mad_send_wr_private *temp_mad_send_wr;
2031 struct list_head *list_item;
2032 unsigned long delay;
2033
2034 mad_agent_priv = mad_send_wr->mad_agent_priv;
2035 list_del(&mad_send_wr->agent_list);
2036
2037 delay = mad_send_wr->timeout;
2038 mad_send_wr->timeout += jiffies;
2039
2040 if (delay) {
2041 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2042 temp_mad_send_wr = list_entry(list_item,
2043 struct ib_mad_send_wr_private,
2044 agent_list);
2045 if (time_after(mad_send_wr->timeout,
2046 temp_mad_send_wr->timeout))
2047 break;
2048 }
2049 }
2050 else
2051 list_item = &mad_agent_priv->wait_list;
2052 list_add(&mad_send_wr->agent_list, list_item);
2053
2054 /* Reschedule a work item if we have a shorter timeout */
2055 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2056 __cancel_delayed_work(&mad_agent_priv->timed_work);
2057 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2058 &mad_agent_priv->timed_work, delay);
2059 }
2060}
2061
2062void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2063 int timeout_ms)
2064{
2065 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2066 wait_for_response(mad_send_wr);
2067}
2068
2069/*
2070 * Process a send work completion
2071 */
2072void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2073 struct ib_mad_send_wc *mad_send_wc)
2074{
2075 struct ib_mad_agent_private *mad_agent_priv;
2076 unsigned long flags;
2077 int ret;
2078
2079 mad_agent_priv = mad_send_wr->mad_agent_priv;
2080 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2081 if (mad_agent_priv->agent.rmpp_version) {
2082 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2083 if (ret == IB_RMPP_RESULT_CONSUMED)
2084 goto done;
2085 } else
2086 ret = IB_RMPP_RESULT_UNHANDLED;
2087
2088 if (mad_send_wc->status != IB_WC_SUCCESS &&
2089 mad_send_wr->status == IB_WC_SUCCESS) {
2090 mad_send_wr->status = mad_send_wc->status;
2091 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2092 }
2093
2094 if (--mad_send_wr->refcount > 0) {
2095 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2096 mad_send_wr->status == IB_WC_SUCCESS) {
2097 wait_for_response(mad_send_wr);
2098 }
2099 goto done;
2100 }
2101
2102 /* Remove send from MAD agent and notify client of completion */
2103 list_del(&mad_send_wr->agent_list);
2104 adjust_timeout(mad_agent_priv);
2105 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2106
2107 if (mad_send_wr->status != IB_WC_SUCCESS )
2108 mad_send_wc->status = mad_send_wr->status;
2109 if (ret == IB_RMPP_RESULT_INTERNAL)
2110 ib_rmpp_send_handler(mad_send_wc);
2111 else
2112 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2113 mad_send_wc);
2114
2115 /* Release reference on agent taken when sending */
2116 deref_mad_agent(mad_agent_priv);
2117 return;
2118done:
2119 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2120}
2121
2122static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2123 struct ib_wc *wc)
2124{
2125 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2126 struct ib_mad_list_head *mad_list;
2127 struct ib_mad_qp_info *qp_info;
2128 struct ib_mad_queue *send_queue;
2129 struct ib_send_wr *bad_send_wr;
2130 struct ib_mad_send_wc mad_send_wc;
2131 unsigned long flags;
2132 int ret;
2133
2134 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2135 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2136 mad_list);
2137 send_queue = mad_list->mad_queue;
2138 qp_info = send_queue->qp_info;
2139
2140retry:
2141 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2142 mad_send_wr->header_mapping,
2143 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2144 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2145 mad_send_wr->payload_mapping,
2146 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2147 queued_send_wr = NULL;
2148 spin_lock_irqsave(&send_queue->lock, flags);
2149 list_del(&mad_list->list);
2150
2151 /* Move queued send to the send queue */
2152 if (send_queue->count-- > send_queue->max_active) {
2153 mad_list = container_of(qp_info->overflow_list.next,
2154 struct ib_mad_list_head, list);
2155 queued_send_wr = container_of(mad_list,
2156 struct ib_mad_send_wr_private,
2157 mad_list);
2158 list_move_tail(&mad_list->list, &send_queue->list);
2159 }
2160 spin_unlock_irqrestore(&send_queue->lock, flags);
2161
2162 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2163 mad_send_wc.status = wc->status;
2164 mad_send_wc.vendor_err = wc->vendor_err;
2165 if (atomic_read(&qp_info->snoop_count))
2166 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2167 IB_MAD_SNOOP_SEND_COMPLETIONS);
2168 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2169
2170 if (queued_send_wr) {
2171 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2172 &bad_send_wr);
2173 if (ret) {
2174 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2175 mad_send_wr = queued_send_wr;
2176 wc->status = IB_WC_LOC_QP_OP_ERR;
2177 goto retry;
2178 }
2179 }
2180}
2181
2182static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2183{
2184 struct ib_mad_send_wr_private *mad_send_wr;
2185 struct ib_mad_list_head *mad_list;
2186 unsigned long flags;
2187
2188 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2189 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2190 mad_send_wr = container_of(mad_list,
2191 struct ib_mad_send_wr_private,
2192 mad_list);
2193 mad_send_wr->retry = 1;
2194 }
2195 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2196}
2197
2198static void mad_error_handler(struct ib_mad_port_private *port_priv,
2199 struct ib_wc *wc)
2200{
2201 struct ib_mad_list_head *mad_list;
2202 struct ib_mad_qp_info *qp_info;
2203 struct ib_mad_send_wr_private *mad_send_wr;
2204 int ret;
2205
2206 /* Determine if failure was a send or receive */
2207 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2208 qp_info = mad_list->mad_queue->qp_info;
2209 if (mad_list->mad_queue == &qp_info->recv_queue)
2210 /*
2211 * Receive errors indicate that the QP has entered the error
2212 * state - error handling/shutdown code will cleanup
2213 */
2214 return;
2215
2216 /*
2217 * Send errors will transition the QP to SQE - move
2218 * QP to RTS and repost flushed work requests
2219 */
2220 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2221 mad_list);
2222 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2223 if (mad_send_wr->retry) {
2224 /* Repost send */
2225 struct ib_send_wr *bad_send_wr;
2226
2227 mad_send_wr->retry = 0;
2228 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2229 &bad_send_wr);
2230 if (ret)
2231 ib_mad_send_done_handler(port_priv, wc);
2232 } else
2233 ib_mad_send_done_handler(port_priv, wc);
2234 } else {
2235 struct ib_qp_attr *attr;
2236
2237 /* Transition QP to RTS and fail offending send */
2238 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2239 if (attr) {
2240 attr->qp_state = IB_QPS_RTS;
2241 attr->cur_qp_state = IB_QPS_SQE;
2242 ret = ib_modify_qp(qp_info->qp, attr,
2243 IB_QP_STATE | IB_QP_CUR_STATE);
2244 kfree(attr);
2245 if (ret)
2246 printk(KERN_ERR PFX "mad_error_handler - "
2247 "ib_modify_qp to RTS : %d\n", ret);
2248 else
2249 mark_sends_for_retry(qp_info);
2250 }
2251 ib_mad_send_done_handler(port_priv, wc);
2252 }
2253}
2254
2255/*
2256 * IB MAD completion callback
2257 */
2258static void ib_mad_completion_handler(struct work_struct *work)
2259{
2260 struct ib_mad_port_private *port_priv;
2261 struct ib_wc wc;
2262
2263 port_priv = container_of(work, struct ib_mad_port_private, work);
2264 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2265
2266 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2267 if (wc.status == IB_WC_SUCCESS) {
2268 switch (wc.opcode) {
2269 case IB_WC_SEND:
2270 ib_mad_send_done_handler(port_priv, &wc);
2271 break;
2272 case IB_WC_RECV:
2273 ib_mad_recv_done_handler(port_priv, &wc);
2274 break;
2275 default:
2276 BUG_ON(1);
2277 break;
2278 }
2279 } else
2280 mad_error_handler(port_priv, &wc);
2281 }
2282}
2283
2284static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2285{
2286 unsigned long flags;
2287 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2288 struct ib_mad_send_wc mad_send_wc;
2289 struct list_head cancel_list;
2290
2291 INIT_LIST_HEAD(&cancel_list);
2292
2293 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2294 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2295 &mad_agent_priv->send_list, agent_list) {
2296 if (mad_send_wr->status == IB_WC_SUCCESS) {
2297 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2298 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2299 }
2300 }
2301
2302 /* Empty wait list to prevent receives from finding a request */
2303 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2304 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2305
2306 /* Report all cancelled requests */
2307 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2308 mad_send_wc.vendor_err = 0;
2309
2310 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2311 &cancel_list, agent_list) {
2312 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2313 list_del(&mad_send_wr->agent_list);
2314 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2315 &mad_send_wc);
2316 atomic_dec(&mad_agent_priv->refcount);
2317 }
2318}
2319
2320static struct ib_mad_send_wr_private*
2321find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2322 struct ib_mad_send_buf *send_buf)
2323{
2324 struct ib_mad_send_wr_private *mad_send_wr;
2325
2326 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2327 agent_list) {
2328 if (&mad_send_wr->send_buf == send_buf)
2329 return mad_send_wr;
2330 }
2331
2332 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2333 agent_list) {
2334 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2335 &mad_send_wr->send_buf == send_buf)
2336 return mad_send_wr;
2337 }
2338 return NULL;
2339}
2340
2341int ib_modify_mad(struct ib_mad_agent *mad_agent,
2342 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2343{
2344 struct ib_mad_agent_private *mad_agent_priv;
2345 struct ib_mad_send_wr_private *mad_send_wr;
2346 unsigned long flags;
2347 int active;
2348
2349 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2350 agent);
2351 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2352 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2353 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2354 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2355 return -EINVAL;
2356 }
2357
2358 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2359 if (!timeout_ms) {
2360 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2361 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2362 }
2363
2364 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2365 if (active)
2366 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2367 else
2368 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2369
2370 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2371 return 0;
2372}
2373EXPORT_SYMBOL(ib_modify_mad);
2374
2375void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2376 struct ib_mad_send_buf *send_buf)
2377{
2378 ib_modify_mad(mad_agent, send_buf, 0);
2379}
2380EXPORT_SYMBOL(ib_cancel_mad);
2381
2382static void local_completions(struct work_struct *work)
2383{
2384 struct ib_mad_agent_private *mad_agent_priv;
2385 struct ib_mad_local_private *local;
2386 struct ib_mad_agent_private *recv_mad_agent;
2387 unsigned long flags;
2388 int free_mad;
2389 struct ib_wc wc;
2390 struct ib_mad_send_wc mad_send_wc;
2391
2392 mad_agent_priv =
2393 container_of(work, struct ib_mad_agent_private, local_work);
2394
2395 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2396 while (!list_empty(&mad_agent_priv->local_list)) {
2397 local = list_entry(mad_agent_priv->local_list.next,
2398 struct ib_mad_local_private,
2399 completion_list);
2400 list_del(&local->completion_list);
2401 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2402 free_mad = 0;
2403 if (local->mad_priv) {
2404 recv_mad_agent = local->recv_mad_agent;
2405 if (!recv_mad_agent) {
2406 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2407 free_mad = 1;
2408 goto local_send_completion;
2409 }
2410
2411 /*
2412 * Defined behavior is to complete response
2413 * before request
2414 */
2415 build_smp_wc(recv_mad_agent->agent.qp,
2416 (unsigned long) local->mad_send_wr,
2417 be16_to_cpu(IB_LID_PERMISSIVE),
2418 0, recv_mad_agent->agent.port_num, &wc);
2419
2420 local->mad_priv->header.recv_wc.wc = &wc;
2421 local->mad_priv->header.recv_wc.mad_len =
2422 sizeof(struct ib_mad);
2423 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2424 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2425 &local->mad_priv->header.recv_wc.rmpp_list);
2426 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2427 local->mad_priv->header.recv_wc.recv_buf.mad =
2428 &local->mad_priv->mad.mad;
2429 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2430 snoop_recv(recv_mad_agent->qp_info,
2431 &local->mad_priv->header.recv_wc,
2432 IB_MAD_SNOOP_RECVS);
2433 recv_mad_agent->agent.recv_handler(
2434 &recv_mad_agent->agent,
2435 &local->mad_priv->header.recv_wc);
2436 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2437 atomic_dec(&recv_mad_agent->refcount);
2438 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2439 }
2440
2441local_send_completion:
2442 /* Complete send */
2443 mad_send_wc.status = IB_WC_SUCCESS;
2444 mad_send_wc.vendor_err = 0;
2445 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2446 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2447 snoop_send(mad_agent_priv->qp_info,
2448 &local->mad_send_wr->send_buf,
2449 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2450 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2451 &mad_send_wc);
2452
2453 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2454 atomic_dec(&mad_agent_priv->refcount);
2455 if (free_mad)
2456 kmem_cache_free(ib_mad_cache, local->mad_priv);
2457 kfree(local);
2458 }
2459 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2460}
2461
2462static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2463{
2464 int ret;
2465
2466 if (!mad_send_wr->retries_left)
2467 return -ETIMEDOUT;
2468
2469 mad_send_wr->retries_left--;
2470 mad_send_wr->send_buf.retries++;
2471
2472 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2473
2474 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2475 ret = ib_retry_rmpp(mad_send_wr);
2476 switch (ret) {
2477 case IB_RMPP_RESULT_UNHANDLED:
2478 ret = ib_send_mad(mad_send_wr);
2479 break;
2480 case IB_RMPP_RESULT_CONSUMED:
2481 ret = 0;
2482 break;
2483 default:
2484 ret = -ECOMM;
2485 break;
2486 }
2487 } else
2488 ret = ib_send_mad(mad_send_wr);
2489
2490 if (!ret) {
2491 mad_send_wr->refcount++;
2492 list_add_tail(&mad_send_wr->agent_list,
2493 &mad_send_wr->mad_agent_priv->send_list);
2494 }
2495 return ret;
2496}
2497
2498static void timeout_sends(struct work_struct *work)
2499{
2500 struct ib_mad_agent_private *mad_agent_priv;
2501 struct ib_mad_send_wr_private *mad_send_wr;
2502 struct ib_mad_send_wc mad_send_wc;
2503 unsigned long flags, delay;
2504
2505 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2506 timed_work.work);
2507 mad_send_wc.vendor_err = 0;
2508
2509 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2510 while (!list_empty(&mad_agent_priv->wait_list)) {
2511 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2512 struct ib_mad_send_wr_private,
2513 agent_list);
2514
2515 if (time_after(mad_send_wr->timeout, jiffies)) {
2516 delay = mad_send_wr->timeout - jiffies;
2517 if ((long)delay <= 0)
2518 delay = 1;
2519 queue_delayed_work(mad_agent_priv->qp_info->
2520 port_priv->wq,
2521 &mad_agent_priv->timed_work, delay);
2522 break;
2523 }
2524
2525 list_del(&mad_send_wr->agent_list);
2526 if (mad_send_wr->status == IB_WC_SUCCESS &&
2527 !retry_send(mad_send_wr))
2528 continue;
2529
2530 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2531
2532 if (mad_send_wr->status == IB_WC_SUCCESS)
2533 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2534 else
2535 mad_send_wc.status = mad_send_wr->status;
2536 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2537 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2538 &mad_send_wc);
2539
2540 atomic_dec(&mad_agent_priv->refcount);
2541 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2542 }
2543 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2544}
2545
2546static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2547{
2548 struct ib_mad_port_private *port_priv = cq->cq_context;
2549 unsigned long flags;
2550
2551 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2552 if (!list_empty(&port_priv->port_list))
2553 queue_work(port_priv->wq, &port_priv->work);
2554 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2555}
2556
2557/*
2558 * Allocate receive MADs and post receive WRs for them
2559 */
2560static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2561 struct ib_mad_private *mad)
2562{
2563 unsigned long flags;
2564 int post, ret;
2565 struct ib_mad_private *mad_priv;
2566 struct ib_sge sg_list;
2567 struct ib_recv_wr recv_wr, *bad_recv_wr;
2568 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2569
2570 /* Initialize common scatter list fields */
2571 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2572 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2573
2574 /* Initialize common receive WR fields */
2575 recv_wr.next = NULL;
2576 recv_wr.sg_list = &sg_list;
2577 recv_wr.num_sge = 1;
2578
2579 do {
2580 /* Allocate and map receive buffer */
2581 if (mad) {
2582 mad_priv = mad;
2583 mad = NULL;
2584 } else {
2585 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2586 if (!mad_priv) {
2587 printk(KERN_ERR PFX "No memory for receive buffer\n");
2588 ret = -ENOMEM;
2589 break;
2590 }
2591 }
2592 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2593 &mad_priv->grh,
2594 sizeof *mad_priv -
2595 sizeof mad_priv->header,
2596 DMA_FROM_DEVICE);
2597 mad_priv->header.mapping = sg_list.addr;
2598 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2599 mad_priv->header.mad_list.mad_queue = recv_queue;
2600
2601 /* Post receive WR */
2602 spin_lock_irqsave(&recv_queue->lock, flags);
2603 post = (++recv_queue->count < recv_queue->max_active);
2604 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2605 spin_unlock_irqrestore(&recv_queue->lock, flags);
2606 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2607 if (ret) {
2608 spin_lock_irqsave(&recv_queue->lock, flags);
2609 list_del(&mad_priv->header.mad_list.list);
2610 recv_queue->count--;
2611 spin_unlock_irqrestore(&recv_queue->lock, flags);
2612 ib_dma_unmap_single(qp_info->port_priv->device,
2613 mad_priv->header.mapping,
2614 sizeof *mad_priv -
2615 sizeof mad_priv->header,
2616 DMA_FROM_DEVICE);
2617 kmem_cache_free(ib_mad_cache, mad_priv);
2618 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2619 break;
2620 }
2621 } while (post);
2622
2623 return ret;
2624}
2625
2626/*
2627 * Return all the posted receive MADs
2628 */
2629static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2630{
2631 struct ib_mad_private_header *mad_priv_hdr;
2632 struct ib_mad_private *recv;
2633 struct ib_mad_list_head *mad_list;
2634
2635 if (!qp_info->qp)
2636 return;
2637
2638 while (!list_empty(&qp_info->recv_queue.list)) {
2639
2640 mad_list = list_entry(qp_info->recv_queue.list.next,
2641 struct ib_mad_list_head, list);
2642 mad_priv_hdr = container_of(mad_list,
2643 struct ib_mad_private_header,
2644 mad_list);
2645 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2646 header);
2647
2648 /* Remove from posted receive MAD list */
2649 list_del(&mad_list->list);
2650
2651 ib_dma_unmap_single(qp_info->port_priv->device,
2652 recv->header.mapping,
2653 sizeof(struct ib_mad_private) -
2654 sizeof(struct ib_mad_private_header),
2655 DMA_FROM_DEVICE);
2656 kmem_cache_free(ib_mad_cache, recv);
2657 }
2658
2659 qp_info->recv_queue.count = 0;
2660}
2661
2662/*
2663 * Start the port
2664 */
2665static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2666{
2667 int ret, i;
2668 struct ib_qp_attr *attr;
2669 struct ib_qp *qp;
2670
2671 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2672 if (!attr) {
2673 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2674 return -ENOMEM;
2675 }
2676
2677 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2678 qp = port_priv->qp_info[i].qp;
2679 if (!qp)
2680 continue;
2681
2682 /*
2683 * PKey index for QP1 is irrelevant but
2684 * one is needed for the Reset to Init transition
2685 */
2686 attr->qp_state = IB_QPS_INIT;
2687 attr->pkey_index = 0;
2688 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2689 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2690 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2691 if (ret) {
2692 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2693 "INIT: %d\n", i, ret);
2694 goto out;
2695 }
2696
2697 attr->qp_state = IB_QPS_RTR;
2698 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2699 if (ret) {
2700 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2701 "RTR: %d\n", i, ret);
2702 goto out;
2703 }
2704
2705 attr->qp_state = IB_QPS_RTS;
2706 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2707 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2708 if (ret) {
2709 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2710 "RTS: %d\n", i, ret);
2711 goto out;
2712 }
2713 }
2714
2715 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2716 if (ret) {
2717 printk(KERN_ERR PFX "Failed to request completion "
2718 "notification: %d\n", ret);
2719 goto out;
2720 }
2721
2722 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2723 if (!port_priv->qp_info[i].qp)
2724 continue;
2725
2726 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2727 if (ret) {
2728 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2729 goto out;
2730 }
2731 }
2732out:
2733 kfree(attr);
2734 return ret;
2735}
2736
2737static void qp_event_handler(struct ib_event *event, void *qp_context)
2738{
2739 struct ib_mad_qp_info *qp_info = qp_context;
2740
2741 /* It's worse than that! He's dead, Jim! */
2742 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2743 event->event, qp_info->qp->qp_num);
2744}
2745
2746static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2747 struct ib_mad_queue *mad_queue)
2748{
2749 mad_queue->qp_info = qp_info;
2750 mad_queue->count = 0;
2751 spin_lock_init(&mad_queue->lock);
2752 INIT_LIST_HEAD(&mad_queue->list);
2753}
2754
2755static void init_mad_qp(struct ib_mad_port_private *port_priv,
2756 struct ib_mad_qp_info *qp_info)
2757{
2758 qp_info->port_priv = port_priv;
2759 init_mad_queue(qp_info, &qp_info->send_queue);
2760 init_mad_queue(qp_info, &qp_info->recv_queue);
2761 INIT_LIST_HEAD(&qp_info->overflow_list);
2762 spin_lock_init(&qp_info->snoop_lock);
2763 qp_info->snoop_table = NULL;
2764 qp_info->snoop_table_size = 0;
2765 atomic_set(&qp_info->snoop_count, 0);
2766}
2767
2768static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2769 enum ib_qp_type qp_type)
2770{
2771 struct ib_qp_init_attr qp_init_attr;
2772 int ret;
2773
2774 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2775 qp_init_attr.send_cq = qp_info->port_priv->cq;
2776 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2777 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2778 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2779 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2780 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2781 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2782 qp_init_attr.qp_type = qp_type;
2783 qp_init_attr.port_num = qp_info->port_priv->port_num;
2784 qp_init_attr.qp_context = qp_info;
2785 qp_init_attr.event_handler = qp_event_handler;
2786 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2787 if (IS_ERR(qp_info->qp)) {
2788 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2789 get_spl_qp_index(qp_type));
2790 ret = PTR_ERR(qp_info->qp);
2791 goto error;
2792 }
2793 /* Use minimum queue sizes unless the CQ is resized */
2794 qp_info->send_queue.max_active = mad_sendq_size;
2795 qp_info->recv_queue.max_active = mad_recvq_size;
2796 return 0;
2797
2798error:
2799 return ret;
2800}
2801
2802static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2803{
2804 if (!qp_info->qp)
2805 return;
2806
2807 ib_destroy_qp(qp_info->qp);
2808 kfree(qp_info->snoop_table);
2809}
2810
2811/*
2812 * Open the port
2813 * Create the QP, PD, MR, and CQ if needed
2814 */
2815static int ib_mad_port_open(struct ib_device *device,
2816 int port_num)
2817{
2818 int ret, cq_size;
2819 struct ib_mad_port_private *port_priv;
2820 unsigned long flags;
2821 char name[sizeof "ib_mad123"];
2822 int has_smi;
2823
2824 /* Create new device info */
2825 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2826 if (!port_priv) {
2827 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2828 return -ENOMEM;
2829 }
2830
2831 port_priv->device = device;
2832 port_priv->port_num = port_num;
2833 spin_lock_init(&port_priv->reg_lock);
2834 INIT_LIST_HEAD(&port_priv->agent_list);
2835 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2836 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2837
2838 cq_size = mad_sendq_size + mad_recvq_size;
2839 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2840 if (has_smi)
2841 cq_size *= 2;
2842
2843 port_priv->cq = ib_create_cq(port_priv->device,
2844 ib_mad_thread_completion_handler,
2845 NULL, port_priv, cq_size, 0);
2846 if (IS_ERR(port_priv->cq)) {
2847 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2848 ret = PTR_ERR(port_priv->cq);
2849 goto error3;
2850 }
2851
2852 port_priv->pd = ib_alloc_pd(device);
2853 if (IS_ERR(port_priv->pd)) {
2854 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2855 ret = PTR_ERR(port_priv->pd);
2856 goto error4;
2857 }
2858
2859 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2860 if (IS_ERR(port_priv->mr)) {
2861 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2862 ret = PTR_ERR(port_priv->mr);
2863 goto error5;
2864 }
2865
2866 if (has_smi) {
2867 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2868 if (ret)
2869 goto error6;
2870 }
2871 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2872 if (ret)
2873 goto error7;
2874
2875 snprintf(name, sizeof name, "ib_mad%d", port_num);
2876 port_priv->wq = create_singlethread_workqueue(name);
2877 if (!port_priv->wq) {
2878 ret = -ENOMEM;
2879 goto error8;
2880 }
2881 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2882
2883 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2884 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2885 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2886
2887 ret = ib_mad_port_start(port_priv);
2888 if (ret) {
2889 printk(KERN_ERR PFX "Couldn't start port\n");
2890 goto error9;
2891 }
2892
2893 return 0;
2894
2895error9:
2896 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2897 list_del_init(&port_priv->port_list);
2898 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2899
2900 destroy_workqueue(port_priv->wq);
2901error8:
2902 destroy_mad_qp(&port_priv->qp_info[1]);
2903error7:
2904 destroy_mad_qp(&port_priv->qp_info[0]);
2905error6:
2906 ib_dereg_mr(port_priv->mr);
2907error5:
2908 ib_dealloc_pd(port_priv->pd);
2909error4:
2910 ib_destroy_cq(port_priv->cq);
2911 cleanup_recv_queue(&port_priv->qp_info[1]);
2912 cleanup_recv_queue(&port_priv->qp_info[0]);
2913error3:
2914 kfree(port_priv);
2915
2916 return ret;
2917}
2918
2919/*
2920 * Close the port
2921 * If there are no classes using the port, free the port
2922 * resources (CQ, MR, PD, QP) and remove the port's info structure
2923 */
2924static int ib_mad_port_close(struct ib_device *device, int port_num)
2925{
2926 struct ib_mad_port_private *port_priv;
2927 unsigned long flags;
2928
2929 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2930 port_priv = __ib_get_mad_port(device, port_num);
2931 if (port_priv == NULL) {
2932 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2933 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2934 return -ENODEV;
2935 }
2936 list_del_init(&port_priv->port_list);
2937 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2938
2939 destroy_workqueue(port_priv->wq);
2940 destroy_mad_qp(&port_priv->qp_info[1]);
2941 destroy_mad_qp(&port_priv->qp_info[0]);
2942 ib_dereg_mr(port_priv->mr);
2943 ib_dealloc_pd(port_priv->pd);
2944 ib_destroy_cq(port_priv->cq);
2945 cleanup_recv_queue(&port_priv->qp_info[1]);
2946 cleanup_recv_queue(&port_priv->qp_info[0]);
2947 /* XXX: Handle deallocation of MAD registration tables */
2948
2949 kfree(port_priv);
2950
2951 return 0;
2952}
2953
2954static void ib_mad_init_device(struct ib_device *device)
2955{
2956 int start, end, i;
2957
2958 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2959 return;
2960
2961 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2962 start = 0;
2963 end = 0;
2964 } else {
2965 start = 1;
2966 end = device->phys_port_cnt;
2967 }
2968
2969 for (i = start; i <= end; i++) {
2970 if (ib_mad_port_open(device, i)) {
2971 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2972 device->name, i);
2973 goto error;
2974 }
2975 if (ib_agent_port_open(device, i)) {
2976 printk(KERN_ERR PFX "Couldn't open %s port %d "
2977 "for agents\n",
2978 device->name, i);
2979 goto error_agent;
2980 }
2981 }
2982 return;
2983
2984error_agent:
2985 if (ib_mad_port_close(device, i))
2986 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2987 device->name, i);
2988
2989error:
2990 i--;
2991
2992 while (i >= start) {
2993 if (ib_agent_port_close(device, i))
2994 printk(KERN_ERR PFX "Couldn't close %s port %d "
2995 "for agents\n",
2996 device->name, i);
2997 if (ib_mad_port_close(device, i))
2998 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2999 device->name, i);
3000 i--;
3001 }
3002}
3003
3004static void ib_mad_remove_device(struct ib_device *device)
3005{
3006 int i, num_ports, cur_port;
3007
3008 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3009 return;
3010
3011 if (device->node_type == RDMA_NODE_IB_SWITCH) {
3012 num_ports = 1;
3013 cur_port = 0;
3014 } else {
3015 num_ports = device->phys_port_cnt;
3016 cur_port = 1;
3017 }
3018 for (i = 0; i < num_ports; i++, cur_port++) {
3019 if (ib_agent_port_close(device, cur_port))
3020 printk(KERN_ERR PFX "Couldn't close %s port %d "
3021 "for agents\n",
3022 device->name, cur_port);
3023 if (ib_mad_port_close(device, cur_port))
3024 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
3025 device->name, cur_port);
3026 }
3027}
3028
3029static struct ib_client mad_client = {
3030 .name = "mad",
3031 .add = ib_mad_init_device,
3032 .remove = ib_mad_remove_device
3033};
3034
3035static int __init ib_mad_init_module(void)
3036{
3037 int ret;
3038
3039 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3040 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3041
3042 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3043 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3044
3045 ib_mad_cache = kmem_cache_create("ib_mad",
3046 sizeof(struct ib_mad_private),
3047 0,
3048 SLAB_HWCACHE_ALIGN,
3049 NULL);
3050 if (!ib_mad_cache) {
3051 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3052 ret = -ENOMEM;
3053 goto error1;
3054 }
3055
3056 INIT_LIST_HEAD(&ib_mad_port_list);
3057
3058 if (ib_register_client(&mad_client)) {
3059 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3060 ret = -EINVAL;
3061 goto error2;
3062 }
3063
3064 return 0;
3065
3066error2:
3067 kmem_cache_destroy(ib_mad_cache);
3068error1:
3069 return ret;
3070}
3071
3072static void __exit ib_mad_cleanup_module(void)
3073{
3074 ib_unregister_client(&mad_client);
3075 kmem_cache_destroy(ib_mad_cache);
3076}
3077
3078module_init(ib_mad_init_module);
3079module_exit(ib_mad_cleanup_module);