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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 * Copyright (c) 2014,2018 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 *
36 */
37
38#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40#include <linux/dma-mapping.h>
41#include <linux/slab.h>
42#include <linux/module.h>
43#include <linux/security.h>
44#include <linux/xarray.h>
45#include <rdma/ib_cache.h>
46
47#include "mad_priv.h"
48#include "core_priv.h"
49#include "mad_rmpp.h"
50#include "smi.h"
51#include "opa_smi.h"
52#include "agent.h"
53
54#define CREATE_TRACE_POINTS
55#include <trace/events/ib_mad.h>
56
57#ifdef CONFIG_TRACEPOINTS
58static void create_mad_addr_info(struct ib_mad_send_wr_private *mad_send_wr,
59 struct ib_mad_qp_info *qp_info,
60 struct trace_event_raw_ib_mad_send_template *entry)
61{
62 u16 pkey;
63 struct ib_device *dev = qp_info->port_priv->device;
64 u32 pnum = qp_info->port_priv->port_num;
65 struct ib_ud_wr *wr = &mad_send_wr->send_wr;
66 struct rdma_ah_attr attr = {};
67
68 rdma_query_ah(wr->ah, &attr);
69
70 /* These are common */
71 entry->sl = attr.sl;
72 ib_query_pkey(dev, pnum, wr->pkey_index, &pkey);
73 entry->pkey = pkey;
74 entry->rqpn = wr->remote_qpn;
75 entry->rqkey = wr->remote_qkey;
76 entry->dlid = rdma_ah_get_dlid(&attr);
77}
78#endif
79
80static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
81static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
82
83module_param_named(send_queue_size, mad_sendq_size, int, 0444);
84MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
85module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
86MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
87
88static DEFINE_XARRAY_ALLOC1(ib_mad_clients);
89static u32 ib_mad_client_next;
90static struct list_head ib_mad_port_list;
91
92/* Port list lock */
93static DEFINE_SPINLOCK(ib_mad_port_list_lock);
94
95/* Forward declarations */
96static int method_in_use(struct ib_mad_mgmt_method_table **method,
97 struct ib_mad_reg_req *mad_reg_req);
98static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
99static struct ib_mad_agent_private *find_mad_agent(
100 struct ib_mad_port_private *port_priv,
101 const struct ib_mad_hdr *mad);
102static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
103 struct ib_mad_private *mad);
104static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
105static void timeout_sends(struct work_struct *work);
106static void local_completions(struct work_struct *work);
107static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
108 struct ib_mad_agent_private *agent_priv,
109 u8 mgmt_class);
110static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
111 struct ib_mad_agent_private *agent_priv);
112static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
113 struct ib_wc *wc);
114static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
115
116/*
117 * Returns a ib_mad_port_private structure or NULL for a device/port
118 * Assumes ib_mad_port_list_lock is being held
119 */
120static inline struct ib_mad_port_private *
121__ib_get_mad_port(struct ib_device *device, u32 port_num)
122{
123 struct ib_mad_port_private *entry;
124
125 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
126 if (entry->device == device && entry->port_num == port_num)
127 return entry;
128 }
129 return NULL;
130}
131
132/*
133 * Wrapper function to return a ib_mad_port_private structure or NULL
134 * for a device/port
135 */
136static inline struct ib_mad_port_private *
137ib_get_mad_port(struct ib_device *device, u32 port_num)
138{
139 struct ib_mad_port_private *entry;
140 unsigned long flags;
141
142 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
143 entry = __ib_get_mad_port(device, port_num);
144 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
145
146 return entry;
147}
148
149static inline u8 convert_mgmt_class(u8 mgmt_class)
150{
151 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
152 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
153 0 : mgmt_class;
154}
155
156static int get_spl_qp_index(enum ib_qp_type qp_type)
157{
158 switch (qp_type) {
159 case IB_QPT_SMI:
160 return 0;
161 case IB_QPT_GSI:
162 return 1;
163 default:
164 return -1;
165 }
166}
167
168static int vendor_class_index(u8 mgmt_class)
169{
170 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
171}
172
173static int is_vendor_class(u8 mgmt_class)
174{
175 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
176 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
177 return 0;
178 return 1;
179}
180
181static int is_vendor_oui(char *oui)
182{
183 if (oui[0] || oui[1] || oui[2])
184 return 1;
185 return 0;
186}
187
188static int is_vendor_method_in_use(
189 struct ib_mad_mgmt_vendor_class *vendor_class,
190 struct ib_mad_reg_req *mad_reg_req)
191{
192 struct ib_mad_mgmt_method_table *method;
193 int i;
194
195 for (i = 0; i < MAX_MGMT_OUI; i++) {
196 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
197 method = vendor_class->method_table[i];
198 if (method) {
199 if (method_in_use(&method, mad_reg_req))
200 return 1;
201 else
202 break;
203 }
204 }
205 }
206 return 0;
207}
208
209int ib_response_mad(const struct ib_mad_hdr *hdr)
210{
211 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
212 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
213 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
214 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
215}
216EXPORT_SYMBOL(ib_response_mad);
217
218/*
219 * ib_register_mad_agent - Register to send/receive MADs
220 *
221 * Context: Process context.
222 */
223struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
224 u32 port_num,
225 enum ib_qp_type qp_type,
226 struct ib_mad_reg_req *mad_reg_req,
227 u8 rmpp_version,
228 ib_mad_send_handler send_handler,
229 ib_mad_recv_handler recv_handler,
230 void *context,
231 u32 registration_flags)
232{
233 struct ib_mad_port_private *port_priv;
234 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
235 struct ib_mad_agent_private *mad_agent_priv;
236 struct ib_mad_reg_req *reg_req = NULL;
237 struct ib_mad_mgmt_class_table *class;
238 struct ib_mad_mgmt_vendor_class_table *vendor;
239 struct ib_mad_mgmt_vendor_class *vendor_class;
240 struct ib_mad_mgmt_method_table *method;
241 int ret2, qpn;
242 u8 mgmt_class, vclass;
243
244 if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
245 (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
246 return ERR_PTR(-EPROTONOSUPPORT);
247
248 /* Validate parameters */
249 qpn = get_spl_qp_index(qp_type);
250 if (qpn == -1) {
251 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
252 __func__, qp_type);
253 goto error1;
254 }
255
256 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
257 dev_dbg_ratelimited(&device->dev,
258 "%s: invalid RMPP Version %u\n",
259 __func__, rmpp_version);
260 goto error1;
261 }
262
263 /* Validate MAD registration request if supplied */
264 if (mad_reg_req) {
265 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
266 dev_dbg_ratelimited(&device->dev,
267 "%s: invalid Class Version %u\n",
268 __func__,
269 mad_reg_req->mgmt_class_version);
270 goto error1;
271 }
272 if (!recv_handler) {
273 dev_dbg_ratelimited(&device->dev,
274 "%s: no recv_handler\n", __func__);
275 goto error1;
276 }
277 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
278 /*
279 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
280 * one in this range currently allowed
281 */
282 if (mad_reg_req->mgmt_class !=
283 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
284 dev_dbg_ratelimited(&device->dev,
285 "%s: Invalid Mgmt Class 0x%x\n",
286 __func__, mad_reg_req->mgmt_class);
287 goto error1;
288 }
289 } else if (mad_reg_req->mgmt_class == 0) {
290 /*
291 * Class 0 is reserved in IBA and is used for
292 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
293 */
294 dev_dbg_ratelimited(&device->dev,
295 "%s: Invalid Mgmt Class 0\n",
296 __func__);
297 goto error1;
298 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
299 /*
300 * If class is in "new" vendor range,
301 * ensure supplied OUI is not zero
302 */
303 if (!is_vendor_oui(mad_reg_req->oui)) {
304 dev_dbg_ratelimited(&device->dev,
305 "%s: No OUI specified for class 0x%x\n",
306 __func__,
307 mad_reg_req->mgmt_class);
308 goto error1;
309 }
310 }
311 /* Make sure class supplied is consistent with RMPP */
312 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
313 if (rmpp_version) {
314 dev_dbg_ratelimited(&device->dev,
315 "%s: RMPP version for non-RMPP class 0x%x\n",
316 __func__, mad_reg_req->mgmt_class);
317 goto error1;
318 }
319 }
320
321 /* Make sure class supplied is consistent with QP type */
322 if (qp_type == IB_QPT_SMI) {
323 if ((mad_reg_req->mgmt_class !=
324 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
325 (mad_reg_req->mgmt_class !=
326 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
327 dev_dbg_ratelimited(&device->dev,
328 "%s: Invalid SM QP type: class 0x%x\n",
329 __func__, mad_reg_req->mgmt_class);
330 goto error1;
331 }
332 } else {
333 if ((mad_reg_req->mgmt_class ==
334 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
335 (mad_reg_req->mgmt_class ==
336 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
337 dev_dbg_ratelimited(&device->dev,
338 "%s: Invalid GS QP type: class 0x%x\n",
339 __func__, mad_reg_req->mgmt_class);
340 goto error1;
341 }
342 }
343 } else {
344 /* No registration request supplied */
345 if (!send_handler)
346 goto error1;
347 if (registration_flags & IB_MAD_USER_RMPP)
348 goto error1;
349 }
350
351 /* Validate device and port */
352 port_priv = ib_get_mad_port(device, port_num);
353 if (!port_priv) {
354 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %u\n",
355 __func__, port_num);
356 ret = ERR_PTR(-ENODEV);
357 goto error1;
358 }
359
360 /* Verify the QP requested is supported. For example, Ethernet devices
361 * will not have QP0.
362 */
363 if (!port_priv->qp_info[qpn].qp) {
364 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
365 __func__, qpn);
366 ret = ERR_PTR(-EPROTONOSUPPORT);
367 goto error1;
368 }
369
370 /* Allocate structures */
371 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
372 if (!mad_agent_priv) {
373 ret = ERR_PTR(-ENOMEM);
374 goto error1;
375 }
376
377 if (mad_reg_req) {
378 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
379 if (!reg_req) {
380 ret = ERR_PTR(-ENOMEM);
381 goto error3;
382 }
383 }
384
385 /* Now, fill in the various structures */
386 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
387 mad_agent_priv->reg_req = reg_req;
388 mad_agent_priv->agent.rmpp_version = rmpp_version;
389 mad_agent_priv->agent.device = device;
390 mad_agent_priv->agent.recv_handler = recv_handler;
391 mad_agent_priv->agent.send_handler = send_handler;
392 mad_agent_priv->agent.context = context;
393 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
394 mad_agent_priv->agent.port_num = port_num;
395 mad_agent_priv->agent.flags = registration_flags;
396 spin_lock_init(&mad_agent_priv->lock);
397 INIT_LIST_HEAD(&mad_agent_priv->send_list);
398 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
399 INIT_LIST_HEAD(&mad_agent_priv->done_list);
400 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
401 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
402 INIT_LIST_HEAD(&mad_agent_priv->local_list);
403 INIT_WORK(&mad_agent_priv->local_work, local_completions);
404 refcount_set(&mad_agent_priv->refcount, 1);
405 init_completion(&mad_agent_priv->comp);
406
407 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
408 if (ret2) {
409 ret = ERR_PTR(ret2);
410 goto error4;
411 }
412
413 /*
414 * The mlx4 driver uses the top byte to distinguish which virtual
415 * function generated the MAD, so we must avoid using it.
416 */
417 ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid,
418 mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1),
419 &ib_mad_client_next, GFP_KERNEL);
420 if (ret2 < 0) {
421 ret = ERR_PTR(ret2);
422 goto error5;
423 }
424
425 /*
426 * Make sure MAD registration (if supplied)
427 * is non overlapping with any existing ones
428 */
429 spin_lock_irq(&port_priv->reg_lock);
430 if (mad_reg_req) {
431 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
432 if (!is_vendor_class(mgmt_class)) {
433 class = port_priv->version[mad_reg_req->
434 mgmt_class_version].class;
435 if (class) {
436 method = class->method_table[mgmt_class];
437 if (method) {
438 if (method_in_use(&method,
439 mad_reg_req))
440 goto error6;
441 }
442 }
443 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
444 mgmt_class);
445 } else {
446 /* "New" vendor class range */
447 vendor = port_priv->version[mad_reg_req->
448 mgmt_class_version].vendor;
449 if (vendor) {
450 vclass = vendor_class_index(mgmt_class);
451 vendor_class = vendor->vendor_class[vclass];
452 if (vendor_class) {
453 if (is_vendor_method_in_use(
454 vendor_class,
455 mad_reg_req))
456 goto error6;
457 }
458 }
459 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
460 }
461 if (ret2) {
462 ret = ERR_PTR(ret2);
463 goto error6;
464 }
465 }
466 spin_unlock_irq(&port_priv->reg_lock);
467
468 trace_ib_mad_create_agent(mad_agent_priv);
469 return &mad_agent_priv->agent;
470error6:
471 spin_unlock_irq(&port_priv->reg_lock);
472 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
473error5:
474 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
475error4:
476 kfree(reg_req);
477error3:
478 kfree(mad_agent_priv);
479error1:
480 return ret;
481}
482EXPORT_SYMBOL(ib_register_mad_agent);
483
484static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
485{
486 if (refcount_dec_and_test(&mad_agent_priv->refcount))
487 complete(&mad_agent_priv->comp);
488}
489
490static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
491{
492 struct ib_mad_port_private *port_priv;
493
494 /* Note that we could still be handling received MADs */
495 trace_ib_mad_unregister_agent(mad_agent_priv);
496
497 /*
498 * Canceling all sends results in dropping received response
499 * MADs, preventing us from queuing additional work
500 */
501 cancel_mads(mad_agent_priv);
502 port_priv = mad_agent_priv->qp_info->port_priv;
503 cancel_delayed_work(&mad_agent_priv->timed_work);
504
505 spin_lock_irq(&port_priv->reg_lock);
506 remove_mad_reg_req(mad_agent_priv);
507 spin_unlock_irq(&port_priv->reg_lock);
508 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
509
510 flush_workqueue(port_priv->wq);
511
512 deref_mad_agent(mad_agent_priv);
513 wait_for_completion(&mad_agent_priv->comp);
514 ib_cancel_rmpp_recvs(mad_agent_priv);
515
516 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
517
518 kfree(mad_agent_priv->reg_req);
519 kfree_rcu(mad_agent_priv, rcu);
520}
521
522/*
523 * ib_unregister_mad_agent - Unregisters a client from using MAD services
524 *
525 * Context: Process context.
526 */
527void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
528{
529 struct ib_mad_agent_private *mad_agent_priv;
530
531 mad_agent_priv = container_of(mad_agent,
532 struct ib_mad_agent_private,
533 agent);
534 unregister_mad_agent(mad_agent_priv);
535}
536EXPORT_SYMBOL(ib_unregister_mad_agent);
537
538static void dequeue_mad(struct ib_mad_list_head *mad_list)
539{
540 struct ib_mad_queue *mad_queue;
541 unsigned long flags;
542
543 mad_queue = mad_list->mad_queue;
544 spin_lock_irqsave(&mad_queue->lock, flags);
545 list_del(&mad_list->list);
546 mad_queue->count--;
547 spin_unlock_irqrestore(&mad_queue->lock, flags);
548}
549
550static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
551 u16 pkey_index, u32 port_num, struct ib_wc *wc)
552{
553 memset(wc, 0, sizeof *wc);
554 wc->wr_cqe = cqe;
555 wc->status = IB_WC_SUCCESS;
556 wc->opcode = IB_WC_RECV;
557 wc->pkey_index = pkey_index;
558 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
559 wc->src_qp = IB_QP0;
560 wc->qp = qp;
561 wc->slid = slid;
562 wc->sl = 0;
563 wc->dlid_path_bits = 0;
564 wc->port_num = port_num;
565}
566
567static size_t mad_priv_size(const struct ib_mad_private *mp)
568{
569 return sizeof(struct ib_mad_private) + mp->mad_size;
570}
571
572static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
573{
574 size_t size = sizeof(struct ib_mad_private) + mad_size;
575 struct ib_mad_private *ret = kzalloc(size, flags);
576
577 if (ret)
578 ret->mad_size = mad_size;
579
580 return ret;
581}
582
583static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
584{
585 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
586}
587
588static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
589{
590 return sizeof(struct ib_grh) + mp->mad_size;
591}
592
593/*
594 * Return 0 if SMP is to be sent
595 * Return 1 if SMP was consumed locally (whether or not solicited)
596 * Return < 0 if error
597 */
598static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
599 struct ib_mad_send_wr_private *mad_send_wr)
600{
601 int ret = 0;
602 struct ib_smp *smp = mad_send_wr->send_buf.mad;
603 struct opa_smp *opa_smp = (struct opa_smp *)smp;
604 unsigned long flags;
605 struct ib_mad_local_private *local;
606 struct ib_mad_private *mad_priv;
607 struct ib_mad_port_private *port_priv;
608 struct ib_mad_agent_private *recv_mad_agent = NULL;
609 struct ib_device *device = mad_agent_priv->agent.device;
610 u32 port_num;
611 struct ib_wc mad_wc;
612 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
613 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
614 u16 out_mad_pkey_index = 0;
615 u16 drslid;
616 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
617 mad_agent_priv->qp_info->port_priv->port_num);
618
619 if (rdma_cap_ib_switch(device) &&
620 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
621 port_num = send_wr->port_num;
622 else
623 port_num = mad_agent_priv->agent.port_num;
624
625 /*
626 * Directed route handling starts if the initial LID routed part of
627 * a request or the ending LID routed part of a response is empty.
628 * If we are at the start of the LID routed part, don't update the
629 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
630 */
631 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
632 u32 opa_drslid;
633
634 trace_ib_mad_handle_out_opa_smi(opa_smp);
635
636 if ((opa_get_smp_direction(opa_smp)
637 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
638 OPA_LID_PERMISSIVE &&
639 opa_smi_handle_dr_smp_send(opa_smp,
640 rdma_cap_ib_switch(device),
641 port_num) == IB_SMI_DISCARD) {
642 ret = -EINVAL;
643 dev_err(&device->dev, "OPA Invalid directed route\n");
644 goto out;
645 }
646 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
647 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
648 opa_drslid & 0xffff0000) {
649 ret = -EINVAL;
650 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
651 opa_drslid);
652 goto out;
653 }
654 drslid = (u16)(opa_drslid & 0x0000ffff);
655
656 /* Check to post send on QP or process locally */
657 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
658 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
659 goto out;
660 } else {
661 trace_ib_mad_handle_out_ib_smi(smp);
662
663 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
664 IB_LID_PERMISSIVE &&
665 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
666 IB_SMI_DISCARD) {
667 ret = -EINVAL;
668 dev_err(&device->dev, "Invalid directed route\n");
669 goto out;
670 }
671 drslid = be16_to_cpu(smp->dr_slid);
672
673 /* Check to post send on QP or process locally */
674 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
675 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
676 goto out;
677 }
678
679 local = kmalloc(sizeof *local, GFP_ATOMIC);
680 if (!local) {
681 ret = -ENOMEM;
682 goto out;
683 }
684 local->mad_priv = NULL;
685 local->recv_mad_agent = NULL;
686 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
687 if (!mad_priv) {
688 ret = -ENOMEM;
689 kfree(local);
690 goto out;
691 }
692
693 build_smp_wc(mad_agent_priv->agent.qp,
694 send_wr->wr.wr_cqe, drslid,
695 send_wr->pkey_index,
696 send_wr->port_num, &mad_wc);
697
698 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
699 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
700 + mad_send_wr->send_buf.data_len
701 + sizeof(struct ib_grh);
702 }
703
704 /* No GRH for DR SMP */
705 ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL,
706 (const struct ib_mad *)smp,
707 (struct ib_mad *)mad_priv->mad, &mad_size,
708 &out_mad_pkey_index);
709 switch (ret) {
710 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
711 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
712 mad_agent_priv->agent.recv_handler) {
713 local->mad_priv = mad_priv;
714 local->recv_mad_agent = mad_agent_priv;
715 /*
716 * Reference MAD agent until receive
717 * side of local completion handled
718 */
719 refcount_inc(&mad_agent_priv->refcount);
720 } else
721 kfree(mad_priv);
722 break;
723 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
724 kfree(mad_priv);
725 break;
726 case IB_MAD_RESULT_SUCCESS:
727 /* Treat like an incoming receive MAD */
728 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
729 mad_agent_priv->agent.port_num);
730 if (port_priv) {
731 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
732 recv_mad_agent = find_mad_agent(port_priv,
733 (const struct ib_mad_hdr *)mad_priv->mad);
734 }
735 if (!port_priv || !recv_mad_agent) {
736 /*
737 * No receiving agent so drop packet and
738 * generate send completion.
739 */
740 kfree(mad_priv);
741 break;
742 }
743 local->mad_priv = mad_priv;
744 local->recv_mad_agent = recv_mad_agent;
745 break;
746 default:
747 kfree(mad_priv);
748 kfree(local);
749 ret = -EINVAL;
750 goto out;
751 }
752
753 local->mad_send_wr = mad_send_wr;
754 if (opa) {
755 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
756 local->return_wc_byte_len = mad_size;
757 }
758 /* Reference MAD agent until send side of local completion handled */
759 refcount_inc(&mad_agent_priv->refcount);
760 /* Queue local completion to local list */
761 spin_lock_irqsave(&mad_agent_priv->lock, flags);
762 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
763 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
764 queue_work(mad_agent_priv->qp_info->port_priv->wq,
765 &mad_agent_priv->local_work);
766 ret = 1;
767out:
768 return ret;
769}
770
771static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
772{
773 int seg_size, pad;
774
775 seg_size = mad_size - hdr_len;
776 if (data_len && seg_size) {
777 pad = seg_size - data_len % seg_size;
778 return pad == seg_size ? 0 : pad;
779 } else
780 return seg_size;
781}
782
783static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
784{
785 struct ib_rmpp_segment *s, *t;
786
787 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
788 list_del(&s->list);
789 kfree(s);
790 }
791}
792
793static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
794 size_t mad_size, gfp_t gfp_mask)
795{
796 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
797 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
798 struct ib_rmpp_segment *seg = NULL;
799 int left, seg_size, pad;
800
801 send_buf->seg_size = mad_size - send_buf->hdr_len;
802 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
803 seg_size = send_buf->seg_size;
804 pad = send_wr->pad;
805
806 /* Allocate data segments. */
807 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
808 seg = kmalloc(sizeof(*seg) + seg_size, gfp_mask);
809 if (!seg) {
810 free_send_rmpp_list(send_wr);
811 return -ENOMEM;
812 }
813 seg->num = ++send_buf->seg_count;
814 list_add_tail(&seg->list, &send_wr->rmpp_list);
815 }
816
817 /* Zero any padding */
818 if (pad)
819 memset(seg->data + seg_size - pad, 0, pad);
820
821 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
822 agent.rmpp_version;
823 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
824 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
825
826 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
827 struct ib_rmpp_segment, list);
828 send_wr->last_ack_seg = send_wr->cur_seg;
829 return 0;
830}
831
832int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
833{
834 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
835}
836EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
837
838struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
839 u32 remote_qpn, u16 pkey_index,
840 int rmpp_active, int hdr_len,
841 int data_len, gfp_t gfp_mask,
842 u8 base_version)
843{
844 struct ib_mad_agent_private *mad_agent_priv;
845 struct ib_mad_send_wr_private *mad_send_wr;
846 int pad, message_size, ret, size;
847 void *buf;
848 size_t mad_size;
849 bool opa;
850
851 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
852 agent);
853
854 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
855
856 if (opa && base_version == OPA_MGMT_BASE_VERSION)
857 mad_size = sizeof(struct opa_mad);
858 else
859 mad_size = sizeof(struct ib_mad);
860
861 pad = get_pad_size(hdr_len, data_len, mad_size);
862 message_size = hdr_len + data_len + pad;
863
864 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
865 if (!rmpp_active && message_size > mad_size)
866 return ERR_PTR(-EINVAL);
867 } else
868 if (rmpp_active || message_size > mad_size)
869 return ERR_PTR(-EINVAL);
870
871 size = rmpp_active ? hdr_len : mad_size;
872 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
873 if (!buf)
874 return ERR_PTR(-ENOMEM);
875
876 mad_send_wr = buf + size;
877 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
878 mad_send_wr->send_buf.mad = buf;
879 mad_send_wr->send_buf.hdr_len = hdr_len;
880 mad_send_wr->send_buf.data_len = data_len;
881 mad_send_wr->pad = pad;
882
883 mad_send_wr->mad_agent_priv = mad_agent_priv;
884 mad_send_wr->sg_list[0].length = hdr_len;
885 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
886
887 /* OPA MADs don't have to be the full 2048 bytes */
888 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
889 data_len < mad_size - hdr_len)
890 mad_send_wr->sg_list[1].length = data_len;
891 else
892 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
893
894 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
895
896 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
897
898 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
899 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
900 mad_send_wr->send_wr.wr.num_sge = 2;
901 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
902 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
903 mad_send_wr->send_wr.remote_qpn = remote_qpn;
904 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
905 mad_send_wr->send_wr.pkey_index = pkey_index;
906
907 if (rmpp_active) {
908 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
909 if (ret) {
910 kfree(buf);
911 return ERR_PTR(ret);
912 }
913 }
914
915 mad_send_wr->send_buf.mad_agent = mad_agent;
916 refcount_inc(&mad_agent_priv->refcount);
917 return &mad_send_wr->send_buf;
918}
919EXPORT_SYMBOL(ib_create_send_mad);
920
921int ib_get_mad_data_offset(u8 mgmt_class)
922{
923 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
924 return IB_MGMT_SA_HDR;
925 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
926 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
927 (mgmt_class == IB_MGMT_CLASS_BIS))
928 return IB_MGMT_DEVICE_HDR;
929 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
930 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
931 return IB_MGMT_VENDOR_HDR;
932 else
933 return IB_MGMT_MAD_HDR;
934}
935EXPORT_SYMBOL(ib_get_mad_data_offset);
936
937int ib_is_mad_class_rmpp(u8 mgmt_class)
938{
939 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
940 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
941 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
942 (mgmt_class == IB_MGMT_CLASS_BIS) ||
943 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
944 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
945 return 1;
946 return 0;
947}
948EXPORT_SYMBOL(ib_is_mad_class_rmpp);
949
950void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
951{
952 struct ib_mad_send_wr_private *mad_send_wr;
953 struct list_head *list;
954
955 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
956 send_buf);
957 list = &mad_send_wr->cur_seg->list;
958
959 if (mad_send_wr->cur_seg->num < seg_num) {
960 list_for_each_entry(mad_send_wr->cur_seg, list, list)
961 if (mad_send_wr->cur_seg->num == seg_num)
962 break;
963 } else if (mad_send_wr->cur_seg->num > seg_num) {
964 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
965 if (mad_send_wr->cur_seg->num == seg_num)
966 break;
967 }
968 return mad_send_wr->cur_seg->data;
969}
970EXPORT_SYMBOL(ib_get_rmpp_segment);
971
972static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
973{
974 if (mad_send_wr->send_buf.seg_count)
975 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
976 mad_send_wr->seg_num);
977 else
978 return mad_send_wr->send_buf.mad +
979 mad_send_wr->send_buf.hdr_len;
980}
981
982void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
983{
984 struct ib_mad_agent_private *mad_agent_priv;
985 struct ib_mad_send_wr_private *mad_send_wr;
986
987 mad_agent_priv = container_of(send_buf->mad_agent,
988 struct ib_mad_agent_private, agent);
989 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
990 send_buf);
991
992 free_send_rmpp_list(mad_send_wr);
993 kfree(send_buf->mad);
994 deref_mad_agent(mad_agent_priv);
995}
996EXPORT_SYMBOL(ib_free_send_mad);
997
998int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
999{
1000 struct ib_mad_qp_info *qp_info;
1001 struct list_head *list;
1002 struct ib_mad_agent *mad_agent;
1003 struct ib_sge *sge;
1004 unsigned long flags;
1005 int ret;
1006
1007 /* Set WR ID to find mad_send_wr upon completion */
1008 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1009 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1010 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1011 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1012
1013 mad_agent = mad_send_wr->send_buf.mad_agent;
1014 sge = mad_send_wr->sg_list;
1015 sge[0].addr = ib_dma_map_single(mad_agent->device,
1016 mad_send_wr->send_buf.mad,
1017 sge[0].length,
1018 DMA_TO_DEVICE);
1019 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1020 return -ENOMEM;
1021
1022 mad_send_wr->header_mapping = sge[0].addr;
1023
1024 sge[1].addr = ib_dma_map_single(mad_agent->device,
1025 ib_get_payload(mad_send_wr),
1026 sge[1].length,
1027 DMA_TO_DEVICE);
1028 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1029 ib_dma_unmap_single(mad_agent->device,
1030 mad_send_wr->header_mapping,
1031 sge[0].length, DMA_TO_DEVICE);
1032 return -ENOMEM;
1033 }
1034 mad_send_wr->payload_mapping = sge[1].addr;
1035
1036 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1037 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1038 trace_ib_mad_ib_send_mad(mad_send_wr, qp_info);
1039 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1040 NULL);
1041 list = &qp_info->send_queue.list;
1042 } else {
1043 ret = 0;
1044 list = &qp_info->overflow_list;
1045 }
1046
1047 if (!ret) {
1048 qp_info->send_queue.count++;
1049 list_add_tail(&mad_send_wr->mad_list.list, list);
1050 }
1051 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1052 if (ret) {
1053 ib_dma_unmap_single(mad_agent->device,
1054 mad_send_wr->header_mapping,
1055 sge[0].length, DMA_TO_DEVICE);
1056 ib_dma_unmap_single(mad_agent->device,
1057 mad_send_wr->payload_mapping,
1058 sge[1].length, DMA_TO_DEVICE);
1059 }
1060 return ret;
1061}
1062
1063/*
1064 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1065 * with the registered client
1066 */
1067int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1068 struct ib_mad_send_buf **bad_send_buf)
1069{
1070 struct ib_mad_agent_private *mad_agent_priv;
1071 struct ib_mad_send_buf *next_send_buf;
1072 struct ib_mad_send_wr_private *mad_send_wr;
1073 unsigned long flags;
1074 int ret = -EINVAL;
1075
1076 /* Walk list of send WRs and post each on send list */
1077 for (; send_buf; send_buf = next_send_buf) {
1078 mad_send_wr = container_of(send_buf,
1079 struct ib_mad_send_wr_private,
1080 send_buf);
1081 mad_agent_priv = mad_send_wr->mad_agent_priv;
1082
1083 ret = ib_mad_enforce_security(mad_agent_priv,
1084 mad_send_wr->send_wr.pkey_index);
1085 if (ret)
1086 goto error;
1087
1088 if (!send_buf->mad_agent->send_handler ||
1089 (send_buf->timeout_ms &&
1090 !send_buf->mad_agent->recv_handler)) {
1091 ret = -EINVAL;
1092 goto error;
1093 }
1094
1095 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1096 if (mad_agent_priv->agent.rmpp_version) {
1097 ret = -EINVAL;
1098 goto error;
1099 }
1100 }
1101
1102 /*
1103 * Save pointer to next work request to post in case the
1104 * current one completes, and the user modifies the work
1105 * request associated with the completion
1106 */
1107 next_send_buf = send_buf->next;
1108 mad_send_wr->send_wr.ah = send_buf->ah;
1109
1110 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1111 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1112 ret = handle_outgoing_dr_smp(mad_agent_priv,
1113 mad_send_wr);
1114 if (ret < 0) /* error */
1115 goto error;
1116 else if (ret == 1) /* locally consumed */
1117 continue;
1118 }
1119
1120 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1121 /* Timeout will be updated after send completes */
1122 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1123 mad_send_wr->max_retries = send_buf->retries;
1124 mad_send_wr->retries_left = send_buf->retries;
1125 send_buf->retries = 0;
1126 /* Reference for work request to QP + response */
1127 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1128 mad_send_wr->status = IB_WC_SUCCESS;
1129
1130 /* Reference MAD agent until send completes */
1131 refcount_inc(&mad_agent_priv->refcount);
1132 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1133 list_add_tail(&mad_send_wr->agent_list,
1134 &mad_agent_priv->send_list);
1135 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1136
1137 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1138 ret = ib_send_rmpp_mad(mad_send_wr);
1139 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1140 ret = ib_send_mad(mad_send_wr);
1141 } else
1142 ret = ib_send_mad(mad_send_wr);
1143 if (ret < 0) {
1144 /* Fail send request */
1145 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1146 list_del(&mad_send_wr->agent_list);
1147 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1148 deref_mad_agent(mad_agent_priv);
1149 goto error;
1150 }
1151 }
1152 return 0;
1153error:
1154 if (bad_send_buf)
1155 *bad_send_buf = send_buf;
1156 return ret;
1157}
1158EXPORT_SYMBOL(ib_post_send_mad);
1159
1160/*
1161 * ib_free_recv_mad - Returns data buffers used to receive
1162 * a MAD to the access layer
1163 */
1164void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1165{
1166 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1167 struct ib_mad_private_header *mad_priv_hdr;
1168 struct ib_mad_private *priv;
1169 struct list_head free_list;
1170
1171 INIT_LIST_HEAD(&free_list);
1172 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1173
1174 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1175 &free_list, list) {
1176 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1177 recv_buf);
1178 mad_priv_hdr = container_of(mad_recv_wc,
1179 struct ib_mad_private_header,
1180 recv_wc);
1181 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1182 header);
1183 kfree(priv);
1184 }
1185}
1186EXPORT_SYMBOL(ib_free_recv_mad);
1187
1188static int method_in_use(struct ib_mad_mgmt_method_table **method,
1189 struct ib_mad_reg_req *mad_reg_req)
1190{
1191 int i;
1192
1193 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1194 if ((*method)->agent[i]) {
1195 pr_err("Method %d already in use\n", i);
1196 return -EINVAL;
1197 }
1198 }
1199 return 0;
1200}
1201
1202static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1203{
1204 /* Allocate management method table */
1205 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1206 return (*method) ? 0 : (-ENOMEM);
1207}
1208
1209/*
1210 * Check to see if there are any methods still in use
1211 */
1212static int check_method_table(struct ib_mad_mgmt_method_table *method)
1213{
1214 int i;
1215
1216 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1217 if (method->agent[i])
1218 return 1;
1219 return 0;
1220}
1221
1222/*
1223 * Check to see if there are any method tables for this class still in use
1224 */
1225static int check_class_table(struct ib_mad_mgmt_class_table *class)
1226{
1227 int i;
1228
1229 for (i = 0; i < MAX_MGMT_CLASS; i++)
1230 if (class->method_table[i])
1231 return 1;
1232 return 0;
1233}
1234
1235static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1236{
1237 int i;
1238
1239 for (i = 0; i < MAX_MGMT_OUI; i++)
1240 if (vendor_class->method_table[i])
1241 return 1;
1242 return 0;
1243}
1244
1245static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1246 const char *oui)
1247{
1248 int i;
1249
1250 for (i = 0; i < MAX_MGMT_OUI; i++)
1251 /* Is there matching OUI for this vendor class ? */
1252 if (!memcmp(vendor_class->oui[i], oui, 3))
1253 return i;
1254
1255 return -1;
1256}
1257
1258static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1259{
1260 int i;
1261
1262 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1263 if (vendor->vendor_class[i])
1264 return 1;
1265
1266 return 0;
1267}
1268
1269static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1270 struct ib_mad_agent_private *agent)
1271{
1272 int i;
1273
1274 /* Remove any methods for this mad agent */
1275 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1276 if (method->agent[i] == agent)
1277 method->agent[i] = NULL;
1278}
1279
1280static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1281 struct ib_mad_agent_private *agent_priv,
1282 u8 mgmt_class)
1283{
1284 struct ib_mad_port_private *port_priv;
1285 struct ib_mad_mgmt_class_table **class;
1286 struct ib_mad_mgmt_method_table **method;
1287 int i, ret;
1288
1289 port_priv = agent_priv->qp_info->port_priv;
1290 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1291 if (!*class) {
1292 /* Allocate management class table for "new" class version */
1293 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1294 if (!*class) {
1295 ret = -ENOMEM;
1296 goto error1;
1297 }
1298
1299 /* Allocate method table for this management class */
1300 method = &(*class)->method_table[mgmt_class];
1301 if ((ret = allocate_method_table(method)))
1302 goto error2;
1303 } else {
1304 method = &(*class)->method_table[mgmt_class];
1305 if (!*method) {
1306 /* Allocate method table for this management class */
1307 if ((ret = allocate_method_table(method)))
1308 goto error1;
1309 }
1310 }
1311
1312 /* Now, make sure methods are not already in use */
1313 if (method_in_use(method, mad_reg_req))
1314 goto error3;
1315
1316 /* Finally, add in methods being registered */
1317 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1318 (*method)->agent[i] = agent_priv;
1319
1320 return 0;
1321
1322error3:
1323 /* Remove any methods for this mad agent */
1324 remove_methods_mad_agent(*method, agent_priv);
1325 /* Now, check to see if there are any methods in use */
1326 if (!check_method_table(*method)) {
1327 /* If not, release management method table */
1328 kfree(*method);
1329 *method = NULL;
1330 }
1331 ret = -EINVAL;
1332 goto error1;
1333error2:
1334 kfree(*class);
1335 *class = NULL;
1336error1:
1337 return ret;
1338}
1339
1340static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1341 struct ib_mad_agent_private *agent_priv)
1342{
1343 struct ib_mad_port_private *port_priv;
1344 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1345 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1346 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1347 struct ib_mad_mgmt_method_table **method;
1348 int i, ret = -ENOMEM;
1349 u8 vclass;
1350
1351 /* "New" vendor (with OUI) class */
1352 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1353 port_priv = agent_priv->qp_info->port_priv;
1354 vendor_table = &port_priv->version[
1355 mad_reg_req->mgmt_class_version].vendor;
1356 if (!*vendor_table) {
1357 /* Allocate mgmt vendor class table for "new" class version */
1358 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1359 if (!vendor)
1360 goto error1;
1361
1362 *vendor_table = vendor;
1363 }
1364 if (!(*vendor_table)->vendor_class[vclass]) {
1365 /* Allocate table for this management vendor class */
1366 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1367 if (!vendor_class)
1368 goto error2;
1369
1370 (*vendor_table)->vendor_class[vclass] = vendor_class;
1371 }
1372 for (i = 0; i < MAX_MGMT_OUI; i++) {
1373 /* Is there matching OUI for this vendor class ? */
1374 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1375 mad_reg_req->oui, 3)) {
1376 method = &(*vendor_table)->vendor_class[
1377 vclass]->method_table[i];
1378 if (!*method)
1379 goto error3;
1380 goto check_in_use;
1381 }
1382 }
1383 for (i = 0; i < MAX_MGMT_OUI; i++) {
1384 /* OUI slot available ? */
1385 if (!is_vendor_oui((*vendor_table)->vendor_class[
1386 vclass]->oui[i])) {
1387 method = &(*vendor_table)->vendor_class[
1388 vclass]->method_table[i];
1389 /* Allocate method table for this OUI */
1390 if (!*method) {
1391 ret = allocate_method_table(method);
1392 if (ret)
1393 goto error3;
1394 }
1395 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1396 mad_reg_req->oui, 3);
1397 goto check_in_use;
1398 }
1399 }
1400 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1401 goto error3;
1402
1403check_in_use:
1404 /* Now, make sure methods are not already in use */
1405 if (method_in_use(method, mad_reg_req))
1406 goto error4;
1407
1408 /* Finally, add in methods being registered */
1409 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1410 (*method)->agent[i] = agent_priv;
1411
1412 return 0;
1413
1414error4:
1415 /* Remove any methods for this mad agent */
1416 remove_methods_mad_agent(*method, agent_priv);
1417 /* Now, check to see if there are any methods in use */
1418 if (!check_method_table(*method)) {
1419 /* If not, release management method table */
1420 kfree(*method);
1421 *method = NULL;
1422 }
1423 ret = -EINVAL;
1424error3:
1425 if (vendor_class) {
1426 (*vendor_table)->vendor_class[vclass] = NULL;
1427 kfree(vendor_class);
1428 }
1429error2:
1430 if (vendor) {
1431 *vendor_table = NULL;
1432 kfree(vendor);
1433 }
1434error1:
1435 return ret;
1436}
1437
1438static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1439{
1440 struct ib_mad_port_private *port_priv;
1441 struct ib_mad_mgmt_class_table *class;
1442 struct ib_mad_mgmt_method_table *method;
1443 struct ib_mad_mgmt_vendor_class_table *vendor;
1444 struct ib_mad_mgmt_vendor_class *vendor_class;
1445 int index;
1446 u8 mgmt_class;
1447
1448 /*
1449 * Was MAD registration request supplied
1450 * with original registration ?
1451 */
1452 if (!agent_priv->reg_req)
1453 goto out;
1454
1455 port_priv = agent_priv->qp_info->port_priv;
1456 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1457 class = port_priv->version[
1458 agent_priv->reg_req->mgmt_class_version].class;
1459 if (!class)
1460 goto vendor_check;
1461
1462 method = class->method_table[mgmt_class];
1463 if (method) {
1464 /* Remove any methods for this mad agent */
1465 remove_methods_mad_agent(method, agent_priv);
1466 /* Now, check to see if there are any methods still in use */
1467 if (!check_method_table(method)) {
1468 /* If not, release management method table */
1469 kfree(method);
1470 class->method_table[mgmt_class] = NULL;
1471 /* Any management classes left ? */
1472 if (!check_class_table(class)) {
1473 /* If not, release management class table */
1474 kfree(class);
1475 port_priv->version[
1476 agent_priv->reg_req->
1477 mgmt_class_version].class = NULL;
1478 }
1479 }
1480 }
1481
1482vendor_check:
1483 if (!is_vendor_class(mgmt_class))
1484 goto out;
1485
1486 /* normalize mgmt_class to vendor range 2 */
1487 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1488 vendor = port_priv->version[
1489 agent_priv->reg_req->mgmt_class_version].vendor;
1490
1491 if (!vendor)
1492 goto out;
1493
1494 vendor_class = vendor->vendor_class[mgmt_class];
1495 if (vendor_class) {
1496 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1497 if (index < 0)
1498 goto out;
1499 method = vendor_class->method_table[index];
1500 if (method) {
1501 /* Remove any methods for this mad agent */
1502 remove_methods_mad_agent(method, agent_priv);
1503 /*
1504 * Now, check to see if there are
1505 * any methods still in use
1506 */
1507 if (!check_method_table(method)) {
1508 /* If not, release management method table */
1509 kfree(method);
1510 vendor_class->method_table[index] = NULL;
1511 memset(vendor_class->oui[index], 0, 3);
1512 /* Any OUIs left ? */
1513 if (!check_vendor_class(vendor_class)) {
1514 /* If not, release vendor class table */
1515 kfree(vendor_class);
1516 vendor->vendor_class[mgmt_class] = NULL;
1517 /* Any other vendor classes left ? */
1518 if (!check_vendor_table(vendor)) {
1519 kfree(vendor);
1520 port_priv->version[
1521 agent_priv->reg_req->
1522 mgmt_class_version].
1523 vendor = NULL;
1524 }
1525 }
1526 }
1527 }
1528 }
1529
1530out:
1531 return;
1532}
1533
1534static struct ib_mad_agent_private *
1535find_mad_agent(struct ib_mad_port_private *port_priv,
1536 const struct ib_mad_hdr *mad_hdr)
1537{
1538 struct ib_mad_agent_private *mad_agent = NULL;
1539 unsigned long flags;
1540
1541 if (ib_response_mad(mad_hdr)) {
1542 u32 hi_tid;
1543
1544 /*
1545 * Routing is based on high 32 bits of transaction ID
1546 * of MAD.
1547 */
1548 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1549 rcu_read_lock();
1550 mad_agent = xa_load(&ib_mad_clients, hi_tid);
1551 if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount))
1552 mad_agent = NULL;
1553 rcu_read_unlock();
1554 } else {
1555 struct ib_mad_mgmt_class_table *class;
1556 struct ib_mad_mgmt_method_table *method;
1557 struct ib_mad_mgmt_vendor_class_table *vendor;
1558 struct ib_mad_mgmt_vendor_class *vendor_class;
1559 const struct ib_vendor_mad *vendor_mad;
1560 int index;
1561
1562 spin_lock_irqsave(&port_priv->reg_lock, flags);
1563 /*
1564 * Routing is based on version, class, and method
1565 * For "newer" vendor MADs, also based on OUI
1566 */
1567 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1568 goto out;
1569 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1570 class = port_priv->version[
1571 mad_hdr->class_version].class;
1572 if (!class)
1573 goto out;
1574 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1575 ARRAY_SIZE(class->method_table))
1576 goto out;
1577 method = class->method_table[convert_mgmt_class(
1578 mad_hdr->mgmt_class)];
1579 if (method)
1580 mad_agent = method->agent[mad_hdr->method &
1581 ~IB_MGMT_METHOD_RESP];
1582 } else {
1583 vendor = port_priv->version[
1584 mad_hdr->class_version].vendor;
1585 if (!vendor)
1586 goto out;
1587 vendor_class = vendor->vendor_class[vendor_class_index(
1588 mad_hdr->mgmt_class)];
1589 if (!vendor_class)
1590 goto out;
1591 /* Find matching OUI */
1592 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1593 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1594 if (index == -1)
1595 goto out;
1596 method = vendor_class->method_table[index];
1597 if (method) {
1598 mad_agent = method->agent[mad_hdr->method &
1599 ~IB_MGMT_METHOD_RESP];
1600 }
1601 }
1602 if (mad_agent)
1603 refcount_inc(&mad_agent->refcount);
1604out:
1605 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1606 }
1607
1608 if (mad_agent && !mad_agent->agent.recv_handler) {
1609 dev_notice(&port_priv->device->dev,
1610 "No receive handler for client %p on port %u\n",
1611 &mad_agent->agent, port_priv->port_num);
1612 deref_mad_agent(mad_agent);
1613 mad_agent = NULL;
1614 }
1615
1616 return mad_agent;
1617}
1618
1619static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1620 const struct ib_mad_qp_info *qp_info,
1621 bool opa)
1622{
1623 int valid = 0;
1624 u32 qp_num = qp_info->qp->qp_num;
1625
1626 /* Make sure MAD base version is understood */
1627 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1628 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1629 pr_err("MAD received with unsupported base version %u %s\n",
1630 mad_hdr->base_version, opa ? "(opa)" : "");
1631 goto out;
1632 }
1633
1634 /* Filter SMI packets sent to other than QP0 */
1635 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1636 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1637 if (qp_num == 0)
1638 valid = 1;
1639 } else {
1640 /* CM attributes other than ClassPortInfo only use Send method */
1641 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1642 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1643 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1644 goto out;
1645 /* Filter GSI packets sent to QP0 */
1646 if (qp_num != 0)
1647 valid = 1;
1648 }
1649
1650out:
1651 return valid;
1652}
1653
1654static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1655 const struct ib_mad_hdr *mad_hdr)
1656{
1657 struct ib_rmpp_mad *rmpp_mad;
1658
1659 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1660 return !mad_agent_priv->agent.rmpp_version ||
1661 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1662 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1663 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1664 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1665}
1666
1667static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1668 const struct ib_mad_recv_wc *rwc)
1669{
1670 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1671 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1672}
1673
1674static inline int
1675rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1676 const struct ib_mad_send_wr_private *wr,
1677 const struct ib_mad_recv_wc *rwc)
1678{
1679 struct rdma_ah_attr attr;
1680 u8 send_resp, rcv_resp;
1681 union ib_gid sgid;
1682 struct ib_device *device = mad_agent_priv->agent.device;
1683 u32 port_num = mad_agent_priv->agent.port_num;
1684 u8 lmc;
1685 bool has_grh;
1686
1687 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1688 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1689
1690 if (send_resp == rcv_resp)
1691 /* both requests, or both responses. GIDs different */
1692 return 0;
1693
1694 if (rdma_query_ah(wr->send_buf.ah, &attr))
1695 /* Assume not equal, to avoid false positives. */
1696 return 0;
1697
1698 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1699 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1700 /* one has GID, other does not. Assume different */
1701 return 0;
1702
1703 if (!send_resp && rcv_resp) {
1704 /* is request/response. */
1705 if (!has_grh) {
1706 if (ib_get_cached_lmc(device, port_num, &lmc))
1707 return 0;
1708 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1709 rwc->wc->dlid_path_bits) &
1710 ((1 << lmc) - 1)));
1711 } else {
1712 const struct ib_global_route *grh =
1713 rdma_ah_read_grh(&attr);
1714
1715 if (rdma_query_gid(device, port_num,
1716 grh->sgid_index, &sgid))
1717 return 0;
1718 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1719 16);
1720 }
1721 }
1722
1723 if (!has_grh)
1724 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1725 else
1726 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1727 rwc->recv_buf.grh->sgid.raw,
1728 16);
1729}
1730
1731static inline int is_direct(u8 class)
1732{
1733 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1734}
1735
1736struct ib_mad_send_wr_private*
1737ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1738 const struct ib_mad_recv_wc *wc)
1739{
1740 struct ib_mad_send_wr_private *wr;
1741 const struct ib_mad_hdr *mad_hdr;
1742
1743 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1744
1745 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1746 if ((wr->tid == mad_hdr->tid) &&
1747 rcv_has_same_class(wr, wc) &&
1748 /*
1749 * Don't check GID for direct routed MADs.
1750 * These might have permissive LIDs.
1751 */
1752 (is_direct(mad_hdr->mgmt_class) ||
1753 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1754 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1755 }
1756
1757 /*
1758 * It's possible to receive the response before we've
1759 * been notified that the send has completed
1760 */
1761 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1762 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1763 wr->tid == mad_hdr->tid &&
1764 wr->timeout &&
1765 rcv_has_same_class(wr, wc) &&
1766 /*
1767 * Don't check GID for direct routed MADs.
1768 * These might have permissive LIDs.
1769 */
1770 (is_direct(mad_hdr->mgmt_class) ||
1771 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1772 /* Verify request has not been canceled */
1773 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1774 }
1775 return NULL;
1776}
1777
1778void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1779{
1780 mad_send_wr->timeout = 0;
1781 if (mad_send_wr->refcount == 1)
1782 list_move_tail(&mad_send_wr->agent_list,
1783 &mad_send_wr->mad_agent_priv->done_list);
1784}
1785
1786static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1787 struct ib_mad_recv_wc *mad_recv_wc)
1788{
1789 struct ib_mad_send_wr_private *mad_send_wr;
1790 struct ib_mad_send_wc mad_send_wc;
1791 unsigned long flags;
1792 int ret;
1793
1794 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1795 ret = ib_mad_enforce_security(mad_agent_priv,
1796 mad_recv_wc->wc->pkey_index);
1797 if (ret) {
1798 ib_free_recv_mad(mad_recv_wc);
1799 deref_mad_agent(mad_agent_priv);
1800 return;
1801 }
1802
1803 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1804 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1805 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1806 mad_recv_wc);
1807 if (!mad_recv_wc) {
1808 deref_mad_agent(mad_agent_priv);
1809 return;
1810 }
1811 }
1812
1813 /* Complete corresponding request */
1814 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1815 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1816 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1817 if (!mad_send_wr) {
1818 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1819 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1820 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1821 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1822 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1823 /* user rmpp is in effect
1824 * and this is an active RMPP MAD
1825 */
1826 mad_agent_priv->agent.recv_handler(
1827 &mad_agent_priv->agent, NULL,
1828 mad_recv_wc);
1829 deref_mad_agent(mad_agent_priv);
1830 } else {
1831 /* not user rmpp, revert to normal behavior and
1832 * drop the mad
1833 */
1834 ib_free_recv_mad(mad_recv_wc);
1835 deref_mad_agent(mad_agent_priv);
1836 return;
1837 }
1838 } else {
1839 ib_mark_mad_done(mad_send_wr);
1840 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1841
1842 /* Defined behavior is to complete response before request */
1843 mad_agent_priv->agent.recv_handler(
1844 &mad_agent_priv->agent,
1845 &mad_send_wr->send_buf,
1846 mad_recv_wc);
1847 deref_mad_agent(mad_agent_priv);
1848
1849 mad_send_wc.status = IB_WC_SUCCESS;
1850 mad_send_wc.vendor_err = 0;
1851 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1852 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1853 }
1854 } else {
1855 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
1856 mad_recv_wc);
1857 deref_mad_agent(mad_agent_priv);
1858 }
1859}
1860
1861static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
1862 const struct ib_mad_qp_info *qp_info,
1863 const struct ib_wc *wc,
1864 u32 port_num,
1865 struct ib_mad_private *recv,
1866 struct ib_mad_private *response)
1867{
1868 enum smi_forward_action retsmi;
1869 struct ib_smp *smp = (struct ib_smp *)recv->mad;
1870
1871 trace_ib_mad_handle_ib_smi(smp);
1872
1873 if (smi_handle_dr_smp_recv(smp,
1874 rdma_cap_ib_switch(port_priv->device),
1875 port_num,
1876 port_priv->device->phys_port_cnt) ==
1877 IB_SMI_DISCARD)
1878 return IB_SMI_DISCARD;
1879
1880 retsmi = smi_check_forward_dr_smp(smp);
1881 if (retsmi == IB_SMI_LOCAL)
1882 return IB_SMI_HANDLE;
1883
1884 if (retsmi == IB_SMI_SEND) { /* don't forward */
1885 if (smi_handle_dr_smp_send(smp,
1886 rdma_cap_ib_switch(port_priv->device),
1887 port_num) == IB_SMI_DISCARD)
1888 return IB_SMI_DISCARD;
1889
1890 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
1891 return IB_SMI_DISCARD;
1892 } else if (rdma_cap_ib_switch(port_priv->device)) {
1893 /* forward case for switches */
1894 memcpy(response, recv, mad_priv_size(response));
1895 response->header.recv_wc.wc = &response->header.wc;
1896 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1897 response->header.recv_wc.recv_buf.grh = &response->grh;
1898
1899 agent_send_response((const struct ib_mad_hdr *)response->mad,
1900 &response->grh, wc,
1901 port_priv->device,
1902 smi_get_fwd_port(smp),
1903 qp_info->qp->qp_num,
1904 response->mad_size,
1905 false);
1906
1907 return IB_SMI_DISCARD;
1908 }
1909 return IB_SMI_HANDLE;
1910}
1911
1912static bool generate_unmatched_resp(const struct ib_mad_private *recv,
1913 struct ib_mad_private *response,
1914 size_t *resp_len, bool opa)
1915{
1916 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
1917 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
1918
1919 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
1920 recv_hdr->method == IB_MGMT_METHOD_SET) {
1921 memcpy(response, recv, mad_priv_size(response));
1922 response->header.recv_wc.wc = &response->header.wc;
1923 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1924 response->header.recv_wc.recv_buf.grh = &response->grh;
1925 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
1926 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1927 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1928 resp_hdr->status |= IB_SMP_DIRECTION;
1929
1930 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
1931 if (recv_hdr->mgmt_class ==
1932 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
1933 recv_hdr->mgmt_class ==
1934 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1935 *resp_len = opa_get_smp_header_size(
1936 (struct opa_smp *)recv->mad);
1937 else
1938 *resp_len = sizeof(struct ib_mad_hdr);
1939 }
1940
1941 return true;
1942 } else {
1943 return false;
1944 }
1945}
1946
1947static enum smi_action
1948handle_opa_smi(struct ib_mad_port_private *port_priv,
1949 struct ib_mad_qp_info *qp_info,
1950 struct ib_wc *wc,
1951 u32 port_num,
1952 struct ib_mad_private *recv,
1953 struct ib_mad_private *response)
1954{
1955 enum smi_forward_action retsmi;
1956 struct opa_smp *smp = (struct opa_smp *)recv->mad;
1957
1958 trace_ib_mad_handle_opa_smi(smp);
1959
1960 if (opa_smi_handle_dr_smp_recv(smp,
1961 rdma_cap_ib_switch(port_priv->device),
1962 port_num,
1963 port_priv->device->phys_port_cnt) ==
1964 IB_SMI_DISCARD)
1965 return IB_SMI_DISCARD;
1966
1967 retsmi = opa_smi_check_forward_dr_smp(smp);
1968 if (retsmi == IB_SMI_LOCAL)
1969 return IB_SMI_HANDLE;
1970
1971 if (retsmi == IB_SMI_SEND) { /* don't forward */
1972 if (opa_smi_handle_dr_smp_send(smp,
1973 rdma_cap_ib_switch(port_priv->device),
1974 port_num) == IB_SMI_DISCARD)
1975 return IB_SMI_DISCARD;
1976
1977 if (opa_smi_check_local_smp(smp, port_priv->device) ==
1978 IB_SMI_DISCARD)
1979 return IB_SMI_DISCARD;
1980
1981 } else if (rdma_cap_ib_switch(port_priv->device)) {
1982 /* forward case for switches */
1983 memcpy(response, recv, mad_priv_size(response));
1984 response->header.recv_wc.wc = &response->header.wc;
1985 response->header.recv_wc.recv_buf.opa_mad =
1986 (struct opa_mad *)response->mad;
1987 response->header.recv_wc.recv_buf.grh = &response->grh;
1988
1989 agent_send_response((const struct ib_mad_hdr *)response->mad,
1990 &response->grh, wc,
1991 port_priv->device,
1992 opa_smi_get_fwd_port(smp),
1993 qp_info->qp->qp_num,
1994 recv->header.wc.byte_len,
1995 true);
1996
1997 return IB_SMI_DISCARD;
1998 }
1999
2000 return IB_SMI_HANDLE;
2001}
2002
2003static enum smi_action
2004handle_smi(struct ib_mad_port_private *port_priv,
2005 struct ib_mad_qp_info *qp_info,
2006 struct ib_wc *wc,
2007 u32 port_num,
2008 struct ib_mad_private *recv,
2009 struct ib_mad_private *response,
2010 bool opa)
2011{
2012 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2013
2014 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2015 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2016 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2017 response);
2018
2019 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2020}
2021
2022static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2023{
2024 struct ib_mad_port_private *port_priv = cq->cq_context;
2025 struct ib_mad_list_head *mad_list =
2026 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2027 struct ib_mad_qp_info *qp_info;
2028 struct ib_mad_private_header *mad_priv_hdr;
2029 struct ib_mad_private *recv, *response = NULL;
2030 struct ib_mad_agent_private *mad_agent;
2031 u32 port_num;
2032 int ret = IB_MAD_RESULT_SUCCESS;
2033 size_t mad_size;
2034 u16 resp_mad_pkey_index = 0;
2035 bool opa;
2036
2037 if (list_empty_careful(&port_priv->port_list))
2038 return;
2039
2040 if (wc->status != IB_WC_SUCCESS) {
2041 /*
2042 * Receive errors indicate that the QP has entered the error
2043 * state - error handling/shutdown code will cleanup
2044 */
2045 return;
2046 }
2047
2048 qp_info = mad_list->mad_queue->qp_info;
2049 dequeue_mad(mad_list);
2050
2051 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2052 qp_info->port_priv->port_num);
2053
2054 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2055 mad_list);
2056 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2057 ib_dma_unmap_single(port_priv->device,
2058 recv->header.mapping,
2059 mad_priv_dma_size(recv),
2060 DMA_FROM_DEVICE);
2061
2062 /* Setup MAD receive work completion from "normal" work completion */
2063 recv->header.wc = *wc;
2064 recv->header.recv_wc.wc = &recv->header.wc;
2065
2066 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2067 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2068 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2069 } else {
2070 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2071 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2072 }
2073
2074 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2075 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2076
2077 /* Validate MAD */
2078 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2079 goto out;
2080
2081 trace_ib_mad_recv_done_handler(qp_info, wc,
2082 (struct ib_mad_hdr *)recv->mad);
2083
2084 mad_size = recv->mad_size;
2085 response = alloc_mad_private(mad_size, GFP_KERNEL);
2086 if (!response)
2087 goto out;
2088
2089 if (rdma_cap_ib_switch(port_priv->device))
2090 port_num = wc->port_num;
2091 else
2092 port_num = port_priv->port_num;
2093
2094 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2095 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2096 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2097 response, opa)
2098 == IB_SMI_DISCARD)
2099 goto out;
2100 }
2101
2102 /* Give driver "right of first refusal" on incoming MAD */
2103 if (port_priv->device->ops.process_mad) {
2104 ret = port_priv->device->ops.process_mad(
2105 port_priv->device, 0, port_priv->port_num, wc,
2106 &recv->grh, (const struct ib_mad *)recv->mad,
2107 (struct ib_mad *)response->mad, &mad_size,
2108 &resp_mad_pkey_index);
2109
2110 if (opa)
2111 wc->pkey_index = resp_mad_pkey_index;
2112
2113 if (ret & IB_MAD_RESULT_SUCCESS) {
2114 if (ret & IB_MAD_RESULT_CONSUMED)
2115 goto out;
2116 if (ret & IB_MAD_RESULT_REPLY) {
2117 agent_send_response((const struct ib_mad_hdr *)response->mad,
2118 &recv->grh, wc,
2119 port_priv->device,
2120 port_num,
2121 qp_info->qp->qp_num,
2122 mad_size, opa);
2123 goto out;
2124 }
2125 }
2126 }
2127
2128 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2129 if (mad_agent) {
2130 trace_ib_mad_recv_done_agent(mad_agent);
2131 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2132 /*
2133 * recv is freed up in error cases in ib_mad_complete_recv
2134 * or via recv_handler in ib_mad_complete_recv()
2135 */
2136 recv = NULL;
2137 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2138 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2139 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2140 port_priv->device, port_num,
2141 qp_info->qp->qp_num, mad_size, opa);
2142 }
2143
2144out:
2145 /* Post another receive request for this QP */
2146 if (response) {
2147 ib_mad_post_receive_mads(qp_info, response);
2148 kfree(recv);
2149 } else
2150 ib_mad_post_receive_mads(qp_info, recv);
2151}
2152
2153static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2154{
2155 struct ib_mad_send_wr_private *mad_send_wr;
2156 unsigned long delay;
2157
2158 if (list_empty(&mad_agent_priv->wait_list)) {
2159 cancel_delayed_work(&mad_agent_priv->timed_work);
2160 } else {
2161 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2162 struct ib_mad_send_wr_private,
2163 agent_list);
2164
2165 if (time_after(mad_agent_priv->timeout,
2166 mad_send_wr->timeout)) {
2167 mad_agent_priv->timeout = mad_send_wr->timeout;
2168 delay = mad_send_wr->timeout - jiffies;
2169 if ((long)delay <= 0)
2170 delay = 1;
2171 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2172 &mad_agent_priv->timed_work, delay);
2173 }
2174 }
2175}
2176
2177static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2178{
2179 struct ib_mad_agent_private *mad_agent_priv;
2180 struct ib_mad_send_wr_private *temp_mad_send_wr;
2181 struct list_head *list_item;
2182 unsigned long delay;
2183
2184 mad_agent_priv = mad_send_wr->mad_agent_priv;
2185 list_del(&mad_send_wr->agent_list);
2186
2187 delay = mad_send_wr->timeout;
2188 mad_send_wr->timeout += jiffies;
2189
2190 if (delay) {
2191 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2192 temp_mad_send_wr = list_entry(list_item,
2193 struct ib_mad_send_wr_private,
2194 agent_list);
2195 if (time_after(mad_send_wr->timeout,
2196 temp_mad_send_wr->timeout))
2197 break;
2198 }
2199 } else {
2200 list_item = &mad_agent_priv->wait_list;
2201 }
2202
2203 list_add(&mad_send_wr->agent_list, list_item);
2204
2205 /* Reschedule a work item if we have a shorter timeout */
2206 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2207 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2208 &mad_agent_priv->timed_work, delay);
2209}
2210
2211void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2212 unsigned long timeout_ms)
2213{
2214 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2215 wait_for_response(mad_send_wr);
2216}
2217
2218/*
2219 * Process a send work completion
2220 */
2221void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2222 struct ib_mad_send_wc *mad_send_wc)
2223{
2224 struct ib_mad_agent_private *mad_agent_priv;
2225 unsigned long flags;
2226 int ret;
2227
2228 mad_agent_priv = mad_send_wr->mad_agent_priv;
2229 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2230 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2231 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2232 if (ret == IB_RMPP_RESULT_CONSUMED)
2233 goto done;
2234 } else
2235 ret = IB_RMPP_RESULT_UNHANDLED;
2236
2237 if (mad_send_wc->status != IB_WC_SUCCESS &&
2238 mad_send_wr->status == IB_WC_SUCCESS) {
2239 mad_send_wr->status = mad_send_wc->status;
2240 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2241 }
2242
2243 if (--mad_send_wr->refcount > 0) {
2244 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2245 mad_send_wr->status == IB_WC_SUCCESS) {
2246 wait_for_response(mad_send_wr);
2247 }
2248 goto done;
2249 }
2250
2251 /* Remove send from MAD agent and notify client of completion */
2252 list_del(&mad_send_wr->agent_list);
2253 adjust_timeout(mad_agent_priv);
2254 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2255
2256 if (mad_send_wr->status != IB_WC_SUCCESS)
2257 mad_send_wc->status = mad_send_wr->status;
2258 if (ret == IB_RMPP_RESULT_INTERNAL)
2259 ib_rmpp_send_handler(mad_send_wc);
2260 else
2261 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2262 mad_send_wc);
2263
2264 /* Release reference on agent taken when sending */
2265 deref_mad_agent(mad_agent_priv);
2266 return;
2267done:
2268 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2269}
2270
2271static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2272{
2273 struct ib_mad_port_private *port_priv = cq->cq_context;
2274 struct ib_mad_list_head *mad_list =
2275 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2276 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2277 struct ib_mad_qp_info *qp_info;
2278 struct ib_mad_queue *send_queue;
2279 struct ib_mad_send_wc mad_send_wc;
2280 unsigned long flags;
2281 int ret;
2282
2283 if (list_empty_careful(&port_priv->port_list))
2284 return;
2285
2286 if (wc->status != IB_WC_SUCCESS) {
2287 if (!ib_mad_send_error(port_priv, wc))
2288 return;
2289 }
2290
2291 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2292 mad_list);
2293 send_queue = mad_list->mad_queue;
2294 qp_info = send_queue->qp_info;
2295
2296 trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
2297 trace_ib_mad_send_done_handler(mad_send_wr, wc);
2298
2299retry:
2300 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2301 mad_send_wr->header_mapping,
2302 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2303 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2304 mad_send_wr->payload_mapping,
2305 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2306 queued_send_wr = NULL;
2307 spin_lock_irqsave(&send_queue->lock, flags);
2308 list_del(&mad_list->list);
2309
2310 /* Move queued send to the send queue */
2311 if (send_queue->count-- > send_queue->max_active) {
2312 mad_list = container_of(qp_info->overflow_list.next,
2313 struct ib_mad_list_head, list);
2314 queued_send_wr = container_of(mad_list,
2315 struct ib_mad_send_wr_private,
2316 mad_list);
2317 list_move_tail(&mad_list->list, &send_queue->list);
2318 }
2319 spin_unlock_irqrestore(&send_queue->lock, flags);
2320
2321 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2322 mad_send_wc.status = wc->status;
2323 mad_send_wc.vendor_err = wc->vendor_err;
2324 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2325
2326 if (queued_send_wr) {
2327 trace_ib_mad_send_done_resend(queued_send_wr, qp_info);
2328 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2329 NULL);
2330 if (ret) {
2331 dev_err(&port_priv->device->dev,
2332 "ib_post_send failed: %d\n", ret);
2333 mad_send_wr = queued_send_wr;
2334 wc->status = IB_WC_LOC_QP_OP_ERR;
2335 goto retry;
2336 }
2337 }
2338}
2339
2340static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2341{
2342 struct ib_mad_send_wr_private *mad_send_wr;
2343 struct ib_mad_list_head *mad_list;
2344 unsigned long flags;
2345
2346 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2347 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2348 mad_send_wr = container_of(mad_list,
2349 struct ib_mad_send_wr_private,
2350 mad_list);
2351 mad_send_wr->retry = 1;
2352 }
2353 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2354}
2355
2356static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2357 struct ib_wc *wc)
2358{
2359 struct ib_mad_list_head *mad_list =
2360 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2361 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2362 struct ib_mad_send_wr_private *mad_send_wr;
2363 int ret;
2364
2365 /*
2366 * Send errors will transition the QP to SQE - move
2367 * QP to RTS and repost flushed work requests
2368 */
2369 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2370 mad_list);
2371 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2372 if (mad_send_wr->retry) {
2373 /* Repost send */
2374 mad_send_wr->retry = 0;
2375 trace_ib_mad_error_handler(mad_send_wr, qp_info);
2376 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2377 NULL);
2378 if (!ret)
2379 return false;
2380 }
2381 } else {
2382 struct ib_qp_attr *attr;
2383
2384 /* Transition QP to RTS and fail offending send */
2385 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2386 if (attr) {
2387 attr->qp_state = IB_QPS_RTS;
2388 attr->cur_qp_state = IB_QPS_SQE;
2389 ret = ib_modify_qp(qp_info->qp, attr,
2390 IB_QP_STATE | IB_QP_CUR_STATE);
2391 kfree(attr);
2392 if (ret)
2393 dev_err(&port_priv->device->dev,
2394 "%s - ib_modify_qp to RTS: %d\n",
2395 __func__, ret);
2396 else
2397 mark_sends_for_retry(qp_info);
2398 }
2399 }
2400
2401 return true;
2402}
2403
2404static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2405{
2406 unsigned long flags;
2407 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2408 struct ib_mad_send_wc mad_send_wc;
2409 struct list_head cancel_list;
2410
2411 INIT_LIST_HEAD(&cancel_list);
2412
2413 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2414 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2415 &mad_agent_priv->send_list, agent_list) {
2416 if (mad_send_wr->status == IB_WC_SUCCESS) {
2417 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2418 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2419 }
2420 }
2421
2422 /* Empty wait list to prevent receives from finding a request */
2423 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2424 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2425
2426 /* Report all cancelled requests */
2427 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2428 mad_send_wc.vendor_err = 0;
2429
2430 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2431 &cancel_list, agent_list) {
2432 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2433 list_del(&mad_send_wr->agent_list);
2434 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2435 &mad_send_wc);
2436 deref_mad_agent(mad_agent_priv);
2437 }
2438}
2439
2440static struct ib_mad_send_wr_private*
2441find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2442 struct ib_mad_send_buf *send_buf)
2443{
2444 struct ib_mad_send_wr_private *mad_send_wr;
2445
2446 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2447 agent_list) {
2448 if (&mad_send_wr->send_buf == send_buf)
2449 return mad_send_wr;
2450 }
2451
2452 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2453 agent_list) {
2454 if (is_rmpp_data_mad(mad_agent_priv,
2455 mad_send_wr->send_buf.mad) &&
2456 &mad_send_wr->send_buf == send_buf)
2457 return mad_send_wr;
2458 }
2459 return NULL;
2460}
2461
2462int ib_modify_mad(struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2463{
2464 struct ib_mad_agent_private *mad_agent_priv;
2465 struct ib_mad_send_wr_private *mad_send_wr;
2466 unsigned long flags;
2467 int active;
2468
2469 if (!send_buf)
2470 return -EINVAL;
2471
2472 mad_agent_priv = container_of(send_buf->mad_agent,
2473 struct ib_mad_agent_private, agent);
2474 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2475 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2476 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2477 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2478 return -EINVAL;
2479 }
2480
2481 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2482 if (!timeout_ms) {
2483 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2484 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2485 }
2486
2487 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2488 if (active)
2489 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2490 else
2491 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2492
2493 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2494 return 0;
2495}
2496EXPORT_SYMBOL(ib_modify_mad);
2497
2498static void local_completions(struct work_struct *work)
2499{
2500 struct ib_mad_agent_private *mad_agent_priv;
2501 struct ib_mad_local_private *local;
2502 struct ib_mad_agent_private *recv_mad_agent;
2503 unsigned long flags;
2504 int free_mad;
2505 struct ib_wc wc;
2506 struct ib_mad_send_wc mad_send_wc;
2507 bool opa;
2508
2509 mad_agent_priv =
2510 container_of(work, struct ib_mad_agent_private, local_work);
2511
2512 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2513 mad_agent_priv->qp_info->port_priv->port_num);
2514
2515 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2516 while (!list_empty(&mad_agent_priv->local_list)) {
2517 local = list_entry(mad_agent_priv->local_list.next,
2518 struct ib_mad_local_private,
2519 completion_list);
2520 list_del(&local->completion_list);
2521 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2522 free_mad = 0;
2523 if (local->mad_priv) {
2524 u8 base_version;
2525 recv_mad_agent = local->recv_mad_agent;
2526 if (!recv_mad_agent) {
2527 dev_err(&mad_agent_priv->agent.device->dev,
2528 "No receive MAD agent for local completion\n");
2529 free_mad = 1;
2530 goto local_send_completion;
2531 }
2532
2533 /*
2534 * Defined behavior is to complete response
2535 * before request
2536 */
2537 build_smp_wc(recv_mad_agent->agent.qp,
2538 local->mad_send_wr->send_wr.wr.wr_cqe,
2539 be16_to_cpu(IB_LID_PERMISSIVE),
2540 local->mad_send_wr->send_wr.pkey_index,
2541 recv_mad_agent->agent.port_num, &wc);
2542
2543 local->mad_priv->header.recv_wc.wc = &wc;
2544
2545 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2546 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2547 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2548 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2549 } else {
2550 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2551 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2552 }
2553
2554 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2555 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2556 &local->mad_priv->header.recv_wc.rmpp_list);
2557 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2558 local->mad_priv->header.recv_wc.recv_buf.mad =
2559 (struct ib_mad *)local->mad_priv->mad;
2560 recv_mad_agent->agent.recv_handler(
2561 &recv_mad_agent->agent,
2562 &local->mad_send_wr->send_buf,
2563 &local->mad_priv->header.recv_wc);
2564 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2565 deref_mad_agent(recv_mad_agent);
2566 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2567 }
2568
2569local_send_completion:
2570 /* Complete send */
2571 mad_send_wc.status = IB_WC_SUCCESS;
2572 mad_send_wc.vendor_err = 0;
2573 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2574 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2575 &mad_send_wc);
2576
2577 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2578 deref_mad_agent(mad_agent_priv);
2579 if (free_mad)
2580 kfree(local->mad_priv);
2581 kfree(local);
2582 }
2583 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2584}
2585
2586static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2587{
2588 int ret;
2589
2590 if (!mad_send_wr->retries_left)
2591 return -ETIMEDOUT;
2592
2593 mad_send_wr->retries_left--;
2594 mad_send_wr->send_buf.retries++;
2595
2596 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2597
2598 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2599 ret = ib_retry_rmpp(mad_send_wr);
2600 switch (ret) {
2601 case IB_RMPP_RESULT_UNHANDLED:
2602 ret = ib_send_mad(mad_send_wr);
2603 break;
2604 case IB_RMPP_RESULT_CONSUMED:
2605 ret = 0;
2606 break;
2607 default:
2608 ret = -ECOMM;
2609 break;
2610 }
2611 } else
2612 ret = ib_send_mad(mad_send_wr);
2613
2614 if (!ret) {
2615 mad_send_wr->refcount++;
2616 list_add_tail(&mad_send_wr->agent_list,
2617 &mad_send_wr->mad_agent_priv->send_list);
2618 }
2619 return ret;
2620}
2621
2622static void timeout_sends(struct work_struct *work)
2623{
2624 struct ib_mad_agent_private *mad_agent_priv;
2625 struct ib_mad_send_wr_private *mad_send_wr;
2626 struct ib_mad_send_wc mad_send_wc;
2627 unsigned long flags, delay;
2628
2629 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2630 timed_work.work);
2631 mad_send_wc.vendor_err = 0;
2632
2633 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2634 while (!list_empty(&mad_agent_priv->wait_list)) {
2635 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2636 struct ib_mad_send_wr_private,
2637 agent_list);
2638
2639 if (time_after(mad_send_wr->timeout, jiffies)) {
2640 delay = mad_send_wr->timeout - jiffies;
2641 if ((long)delay <= 0)
2642 delay = 1;
2643 queue_delayed_work(mad_agent_priv->qp_info->
2644 port_priv->wq,
2645 &mad_agent_priv->timed_work, delay);
2646 break;
2647 }
2648
2649 list_del(&mad_send_wr->agent_list);
2650 if (mad_send_wr->status == IB_WC_SUCCESS &&
2651 !retry_send(mad_send_wr))
2652 continue;
2653
2654 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2655
2656 if (mad_send_wr->status == IB_WC_SUCCESS)
2657 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2658 else
2659 mad_send_wc.status = mad_send_wr->status;
2660 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2661 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2662 &mad_send_wc);
2663
2664 deref_mad_agent(mad_agent_priv);
2665 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2666 }
2667 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2668}
2669
2670/*
2671 * Allocate receive MADs and post receive WRs for them
2672 */
2673static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2674 struct ib_mad_private *mad)
2675{
2676 unsigned long flags;
2677 int post, ret;
2678 struct ib_mad_private *mad_priv;
2679 struct ib_sge sg_list;
2680 struct ib_recv_wr recv_wr;
2681 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2682
2683 /* Initialize common scatter list fields */
2684 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2685
2686 /* Initialize common receive WR fields */
2687 recv_wr.next = NULL;
2688 recv_wr.sg_list = &sg_list;
2689 recv_wr.num_sge = 1;
2690
2691 do {
2692 /* Allocate and map receive buffer */
2693 if (mad) {
2694 mad_priv = mad;
2695 mad = NULL;
2696 } else {
2697 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2698 GFP_ATOMIC);
2699 if (!mad_priv) {
2700 ret = -ENOMEM;
2701 break;
2702 }
2703 }
2704 sg_list.length = mad_priv_dma_size(mad_priv);
2705 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2706 &mad_priv->grh,
2707 mad_priv_dma_size(mad_priv),
2708 DMA_FROM_DEVICE);
2709 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2710 sg_list.addr))) {
2711 kfree(mad_priv);
2712 ret = -ENOMEM;
2713 break;
2714 }
2715 mad_priv->header.mapping = sg_list.addr;
2716 mad_priv->header.mad_list.mad_queue = recv_queue;
2717 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2718 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2719
2720 /* Post receive WR */
2721 spin_lock_irqsave(&recv_queue->lock, flags);
2722 post = (++recv_queue->count < recv_queue->max_active);
2723 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2724 spin_unlock_irqrestore(&recv_queue->lock, flags);
2725 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
2726 if (ret) {
2727 spin_lock_irqsave(&recv_queue->lock, flags);
2728 list_del(&mad_priv->header.mad_list.list);
2729 recv_queue->count--;
2730 spin_unlock_irqrestore(&recv_queue->lock, flags);
2731 ib_dma_unmap_single(qp_info->port_priv->device,
2732 mad_priv->header.mapping,
2733 mad_priv_dma_size(mad_priv),
2734 DMA_FROM_DEVICE);
2735 kfree(mad_priv);
2736 dev_err(&qp_info->port_priv->device->dev,
2737 "ib_post_recv failed: %d\n", ret);
2738 break;
2739 }
2740 } while (post);
2741
2742 return ret;
2743}
2744
2745/*
2746 * Return all the posted receive MADs
2747 */
2748static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2749{
2750 struct ib_mad_private_header *mad_priv_hdr;
2751 struct ib_mad_private *recv;
2752 struct ib_mad_list_head *mad_list;
2753
2754 if (!qp_info->qp)
2755 return;
2756
2757 while (!list_empty(&qp_info->recv_queue.list)) {
2758
2759 mad_list = list_entry(qp_info->recv_queue.list.next,
2760 struct ib_mad_list_head, list);
2761 mad_priv_hdr = container_of(mad_list,
2762 struct ib_mad_private_header,
2763 mad_list);
2764 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2765 header);
2766
2767 /* Remove from posted receive MAD list */
2768 list_del(&mad_list->list);
2769
2770 ib_dma_unmap_single(qp_info->port_priv->device,
2771 recv->header.mapping,
2772 mad_priv_dma_size(recv),
2773 DMA_FROM_DEVICE);
2774 kfree(recv);
2775 }
2776
2777 qp_info->recv_queue.count = 0;
2778}
2779
2780/*
2781 * Start the port
2782 */
2783static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2784{
2785 int ret, i;
2786 struct ib_qp_attr *attr;
2787 struct ib_qp *qp;
2788 u16 pkey_index;
2789
2790 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2791 if (!attr)
2792 return -ENOMEM;
2793
2794 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2795 IB_DEFAULT_PKEY_FULL, &pkey_index);
2796 if (ret)
2797 pkey_index = 0;
2798
2799 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2800 qp = port_priv->qp_info[i].qp;
2801 if (!qp)
2802 continue;
2803
2804 /*
2805 * PKey index for QP1 is irrelevant but
2806 * one is needed for the Reset to Init transition
2807 */
2808 attr->qp_state = IB_QPS_INIT;
2809 attr->pkey_index = pkey_index;
2810 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2811 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2812 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2813 if (ret) {
2814 dev_err(&port_priv->device->dev,
2815 "Couldn't change QP%d state to INIT: %d\n",
2816 i, ret);
2817 goto out;
2818 }
2819
2820 attr->qp_state = IB_QPS_RTR;
2821 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2822 if (ret) {
2823 dev_err(&port_priv->device->dev,
2824 "Couldn't change QP%d state to RTR: %d\n",
2825 i, ret);
2826 goto out;
2827 }
2828
2829 attr->qp_state = IB_QPS_RTS;
2830 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2831 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2832 if (ret) {
2833 dev_err(&port_priv->device->dev,
2834 "Couldn't change QP%d state to RTS: %d\n",
2835 i, ret);
2836 goto out;
2837 }
2838 }
2839
2840 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2841 if (ret) {
2842 dev_err(&port_priv->device->dev,
2843 "Failed to request completion notification: %d\n",
2844 ret);
2845 goto out;
2846 }
2847
2848 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2849 if (!port_priv->qp_info[i].qp)
2850 continue;
2851
2852 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2853 if (ret) {
2854 dev_err(&port_priv->device->dev,
2855 "Couldn't post receive WRs\n");
2856 goto out;
2857 }
2858 }
2859out:
2860 kfree(attr);
2861 return ret;
2862}
2863
2864static void qp_event_handler(struct ib_event *event, void *qp_context)
2865{
2866 struct ib_mad_qp_info *qp_info = qp_context;
2867
2868 /* It's worse than that! He's dead, Jim! */
2869 dev_err(&qp_info->port_priv->device->dev,
2870 "Fatal error (%d) on MAD QP (%u)\n",
2871 event->event, qp_info->qp->qp_num);
2872}
2873
2874static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2875 struct ib_mad_queue *mad_queue)
2876{
2877 mad_queue->qp_info = qp_info;
2878 mad_queue->count = 0;
2879 spin_lock_init(&mad_queue->lock);
2880 INIT_LIST_HEAD(&mad_queue->list);
2881}
2882
2883static void init_mad_qp(struct ib_mad_port_private *port_priv,
2884 struct ib_mad_qp_info *qp_info)
2885{
2886 qp_info->port_priv = port_priv;
2887 init_mad_queue(qp_info, &qp_info->send_queue);
2888 init_mad_queue(qp_info, &qp_info->recv_queue);
2889 INIT_LIST_HEAD(&qp_info->overflow_list);
2890}
2891
2892static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2893 enum ib_qp_type qp_type)
2894{
2895 struct ib_qp_init_attr qp_init_attr;
2896 int ret;
2897
2898 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2899 qp_init_attr.send_cq = qp_info->port_priv->cq;
2900 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2901 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2902 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2903 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2904 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2905 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2906 qp_init_attr.qp_type = qp_type;
2907 qp_init_attr.port_num = qp_info->port_priv->port_num;
2908 qp_init_attr.qp_context = qp_info;
2909 qp_init_attr.event_handler = qp_event_handler;
2910 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2911 if (IS_ERR(qp_info->qp)) {
2912 dev_err(&qp_info->port_priv->device->dev,
2913 "Couldn't create ib_mad QP%d\n",
2914 get_spl_qp_index(qp_type));
2915 ret = PTR_ERR(qp_info->qp);
2916 goto error;
2917 }
2918 /* Use minimum queue sizes unless the CQ is resized */
2919 qp_info->send_queue.max_active = mad_sendq_size;
2920 qp_info->recv_queue.max_active = mad_recvq_size;
2921 return 0;
2922
2923error:
2924 return ret;
2925}
2926
2927static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2928{
2929 if (!qp_info->qp)
2930 return;
2931
2932 ib_destroy_qp(qp_info->qp);
2933}
2934
2935/*
2936 * Open the port
2937 * Create the QP, PD, MR, and CQ if needed
2938 */
2939static int ib_mad_port_open(struct ib_device *device,
2940 u32 port_num)
2941{
2942 int ret, cq_size;
2943 struct ib_mad_port_private *port_priv;
2944 unsigned long flags;
2945 char name[sizeof "ib_mad123"];
2946 int has_smi;
2947
2948 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
2949 return -EFAULT;
2950
2951 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
2952 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
2953 return -EFAULT;
2954
2955 /* Create new device info */
2956 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2957 if (!port_priv)
2958 return -ENOMEM;
2959
2960 port_priv->device = device;
2961 port_priv->port_num = port_num;
2962 spin_lock_init(&port_priv->reg_lock);
2963 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2964 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2965
2966 cq_size = mad_sendq_size + mad_recvq_size;
2967 has_smi = rdma_cap_ib_smi(device, port_num);
2968 if (has_smi)
2969 cq_size *= 2;
2970
2971 port_priv->pd = ib_alloc_pd(device, 0);
2972 if (IS_ERR(port_priv->pd)) {
2973 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2974 ret = PTR_ERR(port_priv->pd);
2975 goto error3;
2976 }
2977
2978 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
2979 IB_POLL_UNBOUND_WORKQUEUE);
2980 if (IS_ERR(port_priv->cq)) {
2981 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2982 ret = PTR_ERR(port_priv->cq);
2983 goto error4;
2984 }
2985
2986 if (has_smi) {
2987 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2988 if (ret)
2989 goto error6;
2990 }
2991 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2992 if (ret)
2993 goto error7;
2994
2995 snprintf(name, sizeof(name), "ib_mad%u", port_num);
2996 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
2997 if (!port_priv->wq) {
2998 ret = -ENOMEM;
2999 goto error8;
3000 }
3001
3002 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3003 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3004 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3005
3006 ret = ib_mad_port_start(port_priv);
3007 if (ret) {
3008 dev_err(&device->dev, "Couldn't start port\n");
3009 goto error9;
3010 }
3011
3012 return 0;
3013
3014error9:
3015 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3016 list_del_init(&port_priv->port_list);
3017 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3018
3019 destroy_workqueue(port_priv->wq);
3020error8:
3021 destroy_mad_qp(&port_priv->qp_info[1]);
3022error7:
3023 destroy_mad_qp(&port_priv->qp_info[0]);
3024error6:
3025 ib_free_cq(port_priv->cq);
3026 cleanup_recv_queue(&port_priv->qp_info[1]);
3027 cleanup_recv_queue(&port_priv->qp_info[0]);
3028error4:
3029 ib_dealloc_pd(port_priv->pd);
3030error3:
3031 kfree(port_priv);
3032
3033 return ret;
3034}
3035
3036/*
3037 * Close the port
3038 * If there are no classes using the port, free the port
3039 * resources (CQ, MR, PD, QP) and remove the port's info structure
3040 */
3041static int ib_mad_port_close(struct ib_device *device, u32 port_num)
3042{
3043 struct ib_mad_port_private *port_priv;
3044 unsigned long flags;
3045
3046 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3047 port_priv = __ib_get_mad_port(device, port_num);
3048 if (port_priv == NULL) {
3049 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3050 dev_err(&device->dev, "Port %u not found\n", port_num);
3051 return -ENODEV;
3052 }
3053 list_del_init(&port_priv->port_list);
3054 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3055
3056 destroy_workqueue(port_priv->wq);
3057 destroy_mad_qp(&port_priv->qp_info[1]);
3058 destroy_mad_qp(&port_priv->qp_info[0]);
3059 ib_free_cq(port_priv->cq);
3060 ib_dealloc_pd(port_priv->pd);
3061 cleanup_recv_queue(&port_priv->qp_info[1]);
3062 cleanup_recv_queue(&port_priv->qp_info[0]);
3063 /* XXX: Handle deallocation of MAD registration tables */
3064
3065 kfree(port_priv);
3066
3067 return 0;
3068}
3069
3070static int ib_mad_init_device(struct ib_device *device)
3071{
3072 int start, i;
3073 unsigned int count = 0;
3074 int ret;
3075
3076 start = rdma_start_port(device);
3077
3078 for (i = start; i <= rdma_end_port(device); i++) {
3079 if (!rdma_cap_ib_mad(device, i))
3080 continue;
3081
3082 ret = ib_mad_port_open(device, i);
3083 if (ret) {
3084 dev_err(&device->dev, "Couldn't open port %d\n", i);
3085 goto error;
3086 }
3087 ret = ib_agent_port_open(device, i);
3088 if (ret) {
3089 dev_err(&device->dev,
3090 "Couldn't open port %d for agents\n", i);
3091 goto error_agent;
3092 }
3093 count++;
3094 }
3095 if (!count)
3096 return -EOPNOTSUPP;
3097
3098 return 0;
3099
3100error_agent:
3101 if (ib_mad_port_close(device, i))
3102 dev_err(&device->dev, "Couldn't close port %d\n", i);
3103
3104error:
3105 while (--i >= start) {
3106 if (!rdma_cap_ib_mad(device, i))
3107 continue;
3108
3109 if (ib_agent_port_close(device, i))
3110 dev_err(&device->dev,
3111 "Couldn't close port %d for agents\n", i);
3112 if (ib_mad_port_close(device, i))
3113 dev_err(&device->dev, "Couldn't close port %d\n", i);
3114 }
3115 return ret;
3116}
3117
3118static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3119{
3120 unsigned int i;
3121
3122 rdma_for_each_port (device, i) {
3123 if (!rdma_cap_ib_mad(device, i))
3124 continue;
3125
3126 if (ib_agent_port_close(device, i))
3127 dev_err(&device->dev,
3128 "Couldn't close port %u for agents\n", i);
3129 if (ib_mad_port_close(device, i))
3130 dev_err(&device->dev, "Couldn't close port %u\n", i);
3131 }
3132}
3133
3134static struct ib_client mad_client = {
3135 .name = "mad",
3136 .add = ib_mad_init_device,
3137 .remove = ib_mad_remove_device
3138};
3139
3140int ib_mad_init(void)
3141{
3142 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3143 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3144
3145 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3146 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3147
3148 INIT_LIST_HEAD(&ib_mad_port_list);
3149
3150 if (ib_register_client(&mad_client)) {
3151 pr_err("Couldn't register ib_mad client\n");
3152 return -EINVAL;
3153 }
3154
3155 return 0;
3156}
3157
3158void ib_mad_cleanup(void)
3159{
3160 ib_unregister_client(&mad_client);
3161}