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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 u8 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, int 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, int 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 {
160 case IB_QPT_SMI:
161 return 0;
162 case IB_QPT_GSI:
163 return 1;
164 default:
165 return -1;
166 }
167}
168
169static int vendor_class_index(u8 mgmt_class)
170{
171 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
172}
173
174static int is_vendor_class(u8 mgmt_class)
175{
176 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
177 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
178 return 0;
179 return 1;
180}
181
182static int is_vendor_oui(char *oui)
183{
184 if (oui[0] || oui[1] || oui[2])
185 return 1;
186 return 0;
187}
188
189static int is_vendor_method_in_use(
190 struct ib_mad_mgmt_vendor_class *vendor_class,
191 struct ib_mad_reg_req *mad_reg_req)
192{
193 struct ib_mad_mgmt_method_table *method;
194 int i;
195
196 for (i = 0; i < MAX_MGMT_OUI; i++) {
197 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
198 method = vendor_class->method_table[i];
199 if (method) {
200 if (method_in_use(&method, mad_reg_req))
201 return 1;
202 else
203 break;
204 }
205 }
206 }
207 return 0;
208}
209
210int ib_response_mad(const struct ib_mad_hdr *hdr)
211{
212 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
213 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
214 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
215 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
216}
217EXPORT_SYMBOL(ib_response_mad);
218
219/*
220 * ib_register_mad_agent - Register to send/receive MADs
221 *
222 * Context: Process context.
223 */
224struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
225 u8 port_num,
226 enum ib_qp_type qp_type,
227 struct ib_mad_reg_req *mad_reg_req,
228 u8 rmpp_version,
229 ib_mad_send_handler send_handler,
230 ib_mad_recv_handler recv_handler,
231 void *context,
232 u32 registration_flags)
233{
234 struct ib_mad_port_private *port_priv;
235 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
236 struct ib_mad_agent_private *mad_agent_priv;
237 struct ib_mad_reg_req *reg_req = NULL;
238 struct ib_mad_mgmt_class_table *class;
239 struct ib_mad_mgmt_vendor_class_table *vendor;
240 struct ib_mad_mgmt_vendor_class *vendor_class;
241 struct ib_mad_mgmt_method_table *method;
242 int ret2, qpn;
243 u8 mgmt_class, vclass;
244
245 if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
246 (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
247 return ERR_PTR(-EPROTONOSUPPORT);
248
249 /* Validate parameters */
250 qpn = get_spl_qp_index(qp_type);
251 if (qpn == -1) {
252 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
253 __func__, qp_type);
254 goto error1;
255 }
256
257 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
258 dev_dbg_ratelimited(&device->dev,
259 "%s: invalid RMPP Version %u\n",
260 __func__, rmpp_version);
261 goto error1;
262 }
263
264 /* Validate MAD registration request if supplied */
265 if (mad_reg_req) {
266 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
267 dev_dbg_ratelimited(&device->dev,
268 "%s: invalid Class Version %u\n",
269 __func__,
270 mad_reg_req->mgmt_class_version);
271 goto error1;
272 }
273 if (!recv_handler) {
274 dev_dbg_ratelimited(&device->dev,
275 "%s: no recv_handler\n", __func__);
276 goto error1;
277 }
278 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
279 /*
280 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
281 * one in this range currently allowed
282 */
283 if (mad_reg_req->mgmt_class !=
284 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
285 dev_dbg_ratelimited(&device->dev,
286 "%s: Invalid Mgmt Class 0x%x\n",
287 __func__, mad_reg_req->mgmt_class);
288 goto error1;
289 }
290 } else if (mad_reg_req->mgmt_class == 0) {
291 /*
292 * Class 0 is reserved in IBA and is used for
293 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
294 */
295 dev_dbg_ratelimited(&device->dev,
296 "%s: Invalid Mgmt Class 0\n",
297 __func__);
298 goto error1;
299 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
300 /*
301 * If class is in "new" vendor range,
302 * ensure supplied OUI is not zero
303 */
304 if (!is_vendor_oui(mad_reg_req->oui)) {
305 dev_dbg_ratelimited(&device->dev,
306 "%s: No OUI specified for class 0x%x\n",
307 __func__,
308 mad_reg_req->mgmt_class);
309 goto error1;
310 }
311 }
312 /* Make sure class supplied is consistent with RMPP */
313 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
314 if (rmpp_version) {
315 dev_dbg_ratelimited(&device->dev,
316 "%s: RMPP version for non-RMPP class 0x%x\n",
317 __func__, mad_reg_req->mgmt_class);
318 goto error1;
319 }
320 }
321
322 /* Make sure class supplied is consistent with QP type */
323 if (qp_type == IB_QPT_SMI) {
324 if ((mad_reg_req->mgmt_class !=
325 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
326 (mad_reg_req->mgmt_class !=
327 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
328 dev_dbg_ratelimited(&device->dev,
329 "%s: Invalid SM QP type: class 0x%x\n",
330 __func__, mad_reg_req->mgmt_class);
331 goto error1;
332 }
333 } else {
334 if ((mad_reg_req->mgmt_class ==
335 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
336 (mad_reg_req->mgmt_class ==
337 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
338 dev_dbg_ratelimited(&device->dev,
339 "%s: Invalid GS QP type: class 0x%x\n",
340 __func__, mad_reg_req->mgmt_class);
341 goto error1;
342 }
343 }
344 } else {
345 /* No registration request supplied */
346 if (!send_handler)
347 goto error1;
348 if (registration_flags & IB_MAD_USER_RMPP)
349 goto error1;
350 }
351
352 /* Validate device and port */
353 port_priv = ib_get_mad_port(device, port_num);
354 if (!port_priv) {
355 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %d\n",
356 __func__, port_num);
357 ret = ERR_PTR(-ENODEV);
358 goto error1;
359 }
360
361 /* Verify the QP requested is supported. For example, Ethernet devices
362 * will not have QP0.
363 */
364 if (!port_priv->qp_info[qpn].qp) {
365 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
366 __func__, qpn);
367 ret = ERR_PTR(-EPROTONOSUPPORT);
368 goto error1;
369 }
370
371 /* Allocate structures */
372 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
373 if (!mad_agent_priv) {
374 ret = ERR_PTR(-ENOMEM);
375 goto error1;
376 }
377
378 if (mad_reg_req) {
379 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
380 if (!reg_req) {
381 ret = ERR_PTR(-ENOMEM);
382 goto error3;
383 }
384 }
385
386 /* Now, fill in the various structures */
387 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
388 mad_agent_priv->reg_req = reg_req;
389 mad_agent_priv->agent.rmpp_version = rmpp_version;
390 mad_agent_priv->agent.device = device;
391 mad_agent_priv->agent.recv_handler = recv_handler;
392 mad_agent_priv->agent.send_handler = send_handler;
393 mad_agent_priv->agent.context = context;
394 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
395 mad_agent_priv->agent.port_num = port_num;
396 mad_agent_priv->agent.flags = registration_flags;
397 spin_lock_init(&mad_agent_priv->lock);
398 INIT_LIST_HEAD(&mad_agent_priv->send_list);
399 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
400 INIT_LIST_HEAD(&mad_agent_priv->done_list);
401 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
402 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
403 INIT_LIST_HEAD(&mad_agent_priv->local_list);
404 INIT_WORK(&mad_agent_priv->local_work, local_completions);
405 refcount_set(&mad_agent_priv->refcount, 1);
406 init_completion(&mad_agent_priv->comp);
407
408 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
409 if (ret2) {
410 ret = ERR_PTR(ret2);
411 goto error4;
412 }
413
414 /*
415 * The mlx4 driver uses the top byte to distinguish which virtual
416 * function generated the MAD, so we must avoid using it.
417 */
418 ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid,
419 mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1),
420 &ib_mad_client_next, GFP_KERNEL);
421 if (ret2 < 0) {
422 ret = ERR_PTR(ret2);
423 goto error5;
424 }
425
426 /*
427 * Make sure MAD registration (if supplied)
428 * is non overlapping with any existing ones
429 */
430 spin_lock_irq(&port_priv->reg_lock);
431 if (mad_reg_req) {
432 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
433 if (!is_vendor_class(mgmt_class)) {
434 class = port_priv->version[mad_reg_req->
435 mgmt_class_version].class;
436 if (class) {
437 method = class->method_table[mgmt_class];
438 if (method) {
439 if (method_in_use(&method,
440 mad_reg_req))
441 goto error6;
442 }
443 }
444 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
445 mgmt_class);
446 } else {
447 /* "New" vendor class range */
448 vendor = port_priv->version[mad_reg_req->
449 mgmt_class_version].vendor;
450 if (vendor) {
451 vclass = vendor_class_index(mgmt_class);
452 vendor_class = vendor->vendor_class[vclass];
453 if (vendor_class) {
454 if (is_vendor_method_in_use(
455 vendor_class,
456 mad_reg_req))
457 goto error6;
458 }
459 }
460 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
461 }
462 if (ret2) {
463 ret = ERR_PTR(ret2);
464 goto error6;
465 }
466 }
467 spin_unlock_irq(&port_priv->reg_lock);
468
469 trace_ib_mad_create_agent(mad_agent_priv);
470 return &mad_agent_priv->agent;
471error6:
472 spin_unlock_irq(&port_priv->reg_lock);
473 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
474error5:
475 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
476error4:
477 kfree(reg_req);
478error3:
479 kfree(mad_agent_priv);
480error1:
481 return ret;
482}
483EXPORT_SYMBOL(ib_register_mad_agent);
484
485static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
486{
487 if (refcount_dec_and_test(&mad_agent_priv->refcount))
488 complete(&mad_agent_priv->comp);
489}
490
491static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
492{
493 struct ib_mad_port_private *port_priv;
494
495 /* Note that we could still be handling received MADs */
496 trace_ib_mad_unregister_agent(mad_agent_priv);
497
498 /*
499 * Canceling all sends results in dropping received response
500 * MADs, preventing us from queuing additional work
501 */
502 cancel_mads(mad_agent_priv);
503 port_priv = mad_agent_priv->qp_info->port_priv;
504 cancel_delayed_work(&mad_agent_priv->timed_work);
505
506 spin_lock_irq(&port_priv->reg_lock);
507 remove_mad_reg_req(mad_agent_priv);
508 spin_unlock_irq(&port_priv->reg_lock);
509 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
510
511 flush_workqueue(port_priv->wq);
512
513 deref_mad_agent(mad_agent_priv);
514 wait_for_completion(&mad_agent_priv->comp);
515 ib_cancel_rmpp_recvs(mad_agent_priv);
516
517 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
518
519 kfree(mad_agent_priv->reg_req);
520 kfree_rcu(mad_agent_priv, rcu);
521}
522
523/*
524 * ib_unregister_mad_agent - Unregisters a client from using MAD services
525 *
526 * Context: Process context.
527 */
528void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
529{
530 struct ib_mad_agent_private *mad_agent_priv;
531
532 mad_agent_priv = container_of(mad_agent,
533 struct ib_mad_agent_private,
534 agent);
535 unregister_mad_agent(mad_agent_priv);
536}
537EXPORT_SYMBOL(ib_unregister_mad_agent);
538
539static void dequeue_mad(struct ib_mad_list_head *mad_list)
540{
541 struct ib_mad_queue *mad_queue;
542 unsigned long flags;
543
544 mad_queue = mad_list->mad_queue;
545 spin_lock_irqsave(&mad_queue->lock, flags);
546 list_del(&mad_list->list);
547 mad_queue->count--;
548 spin_unlock_irqrestore(&mad_queue->lock, flags);
549}
550
551static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
552 u16 pkey_index, u8 port_num, struct ib_wc *wc)
553{
554 memset(wc, 0, sizeof *wc);
555 wc->wr_cqe = cqe;
556 wc->status = IB_WC_SUCCESS;
557 wc->opcode = IB_WC_RECV;
558 wc->pkey_index = pkey_index;
559 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
560 wc->src_qp = IB_QP0;
561 wc->qp = qp;
562 wc->slid = slid;
563 wc->sl = 0;
564 wc->dlid_path_bits = 0;
565 wc->port_num = port_num;
566}
567
568static size_t mad_priv_size(const struct ib_mad_private *mp)
569{
570 return sizeof(struct ib_mad_private) + mp->mad_size;
571}
572
573static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
574{
575 size_t size = sizeof(struct ib_mad_private) + mad_size;
576 struct ib_mad_private *ret = kzalloc(size, flags);
577
578 if (ret)
579 ret->mad_size = mad_size;
580
581 return ret;
582}
583
584static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
585{
586 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
587}
588
589static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
590{
591 return sizeof(struct ib_grh) + mp->mad_size;
592}
593
594/*
595 * Return 0 if SMP is to be sent
596 * Return 1 if SMP was consumed locally (whether or not solicited)
597 * Return < 0 if error
598 */
599static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
600 struct ib_mad_send_wr_private *mad_send_wr)
601{
602 int ret = 0;
603 struct ib_smp *smp = mad_send_wr->send_buf.mad;
604 struct opa_smp *opa_smp = (struct opa_smp *)smp;
605 unsigned long flags;
606 struct ib_mad_local_private *local;
607 struct ib_mad_private *mad_priv;
608 struct ib_mad_port_private *port_priv;
609 struct ib_mad_agent_private *recv_mad_agent = NULL;
610 struct ib_device *device = mad_agent_priv->agent.device;
611 u8 port_num;
612 struct ib_wc mad_wc;
613 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
614 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
615 u16 out_mad_pkey_index = 0;
616 u16 drslid;
617 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
618 mad_agent_priv->qp_info->port_priv->port_num);
619
620 if (rdma_cap_ib_switch(device) &&
621 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
622 port_num = send_wr->port_num;
623 else
624 port_num = mad_agent_priv->agent.port_num;
625
626 /*
627 * Directed route handling starts if the initial LID routed part of
628 * a request or the ending LID routed part of a response is empty.
629 * If we are at the start of the LID routed part, don't update the
630 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
631 */
632 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
633 u32 opa_drslid;
634
635 trace_ib_mad_handle_out_opa_smi(opa_smp);
636
637 if ((opa_get_smp_direction(opa_smp)
638 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
639 OPA_LID_PERMISSIVE &&
640 opa_smi_handle_dr_smp_send(opa_smp,
641 rdma_cap_ib_switch(device),
642 port_num) == IB_SMI_DISCARD) {
643 ret = -EINVAL;
644 dev_err(&device->dev, "OPA Invalid directed route\n");
645 goto out;
646 }
647 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
648 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
649 opa_drslid & 0xffff0000) {
650 ret = -EINVAL;
651 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
652 opa_drslid);
653 goto out;
654 }
655 drslid = (u16)(opa_drslid & 0x0000ffff);
656
657 /* Check to post send on QP or process locally */
658 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
659 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
660 goto out;
661 } else {
662 trace_ib_mad_handle_out_ib_smi(smp);
663
664 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
665 IB_LID_PERMISSIVE &&
666 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
667 IB_SMI_DISCARD) {
668 ret = -EINVAL;
669 dev_err(&device->dev, "Invalid directed route\n");
670 goto out;
671 }
672 drslid = be16_to_cpu(smp->dr_slid);
673
674 /* Check to post send on QP or process locally */
675 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
676 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
677 goto out;
678 }
679
680 local = kmalloc(sizeof *local, GFP_ATOMIC);
681 if (!local) {
682 ret = -ENOMEM;
683 goto out;
684 }
685 local->mad_priv = NULL;
686 local->recv_mad_agent = NULL;
687 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
688 if (!mad_priv) {
689 ret = -ENOMEM;
690 kfree(local);
691 goto out;
692 }
693
694 build_smp_wc(mad_agent_priv->agent.qp,
695 send_wr->wr.wr_cqe, drslid,
696 send_wr->pkey_index,
697 send_wr->port_num, &mad_wc);
698
699 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
700 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
701 + mad_send_wr->send_buf.data_len
702 + sizeof(struct ib_grh);
703 }
704
705 /* No GRH for DR SMP */
706 ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL,
707 (const struct ib_mad *)smp,
708 (struct ib_mad *)mad_priv->mad, &mad_size,
709 &out_mad_pkey_index);
710 switch (ret)
711 {
712 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
713 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
714 mad_agent_priv->agent.recv_handler) {
715 local->mad_priv = mad_priv;
716 local->recv_mad_agent = mad_agent_priv;
717 /*
718 * Reference MAD agent until receive
719 * side of local completion handled
720 */
721 refcount_inc(&mad_agent_priv->refcount);
722 } else
723 kfree(mad_priv);
724 break;
725 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
726 kfree(mad_priv);
727 break;
728 case IB_MAD_RESULT_SUCCESS:
729 /* Treat like an incoming receive MAD */
730 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
731 mad_agent_priv->agent.port_num);
732 if (port_priv) {
733 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
734 recv_mad_agent = find_mad_agent(port_priv,
735 (const struct ib_mad_hdr *)mad_priv->mad);
736 }
737 if (!port_priv || !recv_mad_agent) {
738 /*
739 * No receiving agent so drop packet and
740 * generate send completion.
741 */
742 kfree(mad_priv);
743 break;
744 }
745 local->mad_priv = mad_priv;
746 local->recv_mad_agent = recv_mad_agent;
747 break;
748 default:
749 kfree(mad_priv);
750 kfree(local);
751 ret = -EINVAL;
752 goto out;
753 }
754
755 local->mad_send_wr = mad_send_wr;
756 if (opa) {
757 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
758 local->return_wc_byte_len = mad_size;
759 }
760 /* Reference MAD agent until send side of local completion handled */
761 refcount_inc(&mad_agent_priv->refcount);
762 /* Queue local completion to local list */
763 spin_lock_irqsave(&mad_agent_priv->lock, flags);
764 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
765 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
766 queue_work(mad_agent_priv->qp_info->port_priv->wq,
767 &mad_agent_priv->local_work);
768 ret = 1;
769out:
770 return ret;
771}
772
773static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
774{
775 int seg_size, pad;
776
777 seg_size = mad_size - hdr_len;
778 if (data_len && seg_size) {
779 pad = seg_size - data_len % seg_size;
780 return pad == seg_size ? 0 : pad;
781 } else
782 return seg_size;
783}
784
785static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
786{
787 struct ib_rmpp_segment *s, *t;
788
789 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
790 list_del(&s->list);
791 kfree(s);
792 }
793}
794
795static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
796 size_t mad_size, gfp_t gfp_mask)
797{
798 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
799 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
800 struct ib_rmpp_segment *seg = NULL;
801 int left, seg_size, pad;
802
803 send_buf->seg_size = mad_size - send_buf->hdr_len;
804 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
805 seg_size = send_buf->seg_size;
806 pad = send_wr->pad;
807
808 /* Allocate data segments. */
809 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
810 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
811 if (!seg) {
812 free_send_rmpp_list(send_wr);
813 return -ENOMEM;
814 }
815 seg->num = ++send_buf->seg_count;
816 list_add_tail(&seg->list, &send_wr->rmpp_list);
817 }
818
819 /* Zero any padding */
820 if (pad)
821 memset(seg->data + seg_size - pad, 0, pad);
822
823 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
824 agent.rmpp_version;
825 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
826 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
827
828 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
829 struct ib_rmpp_segment, list);
830 send_wr->last_ack_seg = send_wr->cur_seg;
831 return 0;
832}
833
834int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
835{
836 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
837}
838EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
839
840struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
841 u32 remote_qpn, u16 pkey_index,
842 int rmpp_active,
843 int hdr_len, int data_len,
844 gfp_t gfp_mask,
845 u8 base_version)
846{
847 struct ib_mad_agent_private *mad_agent_priv;
848 struct ib_mad_send_wr_private *mad_send_wr;
849 int pad, message_size, ret, size;
850 void *buf;
851 size_t mad_size;
852 bool opa;
853
854 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
855 agent);
856
857 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
858
859 if (opa && base_version == OPA_MGMT_BASE_VERSION)
860 mad_size = sizeof(struct opa_mad);
861 else
862 mad_size = sizeof(struct ib_mad);
863
864 pad = get_pad_size(hdr_len, data_len, mad_size);
865 message_size = hdr_len + data_len + pad;
866
867 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
868 if (!rmpp_active && message_size > mad_size)
869 return ERR_PTR(-EINVAL);
870 } else
871 if (rmpp_active || message_size > mad_size)
872 return ERR_PTR(-EINVAL);
873
874 size = rmpp_active ? hdr_len : mad_size;
875 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
876 if (!buf)
877 return ERR_PTR(-ENOMEM);
878
879 mad_send_wr = buf + size;
880 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
881 mad_send_wr->send_buf.mad = buf;
882 mad_send_wr->send_buf.hdr_len = hdr_len;
883 mad_send_wr->send_buf.data_len = data_len;
884 mad_send_wr->pad = pad;
885
886 mad_send_wr->mad_agent_priv = mad_agent_priv;
887 mad_send_wr->sg_list[0].length = hdr_len;
888 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
889
890 /* OPA MADs don't have to be the full 2048 bytes */
891 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
892 data_len < mad_size - hdr_len)
893 mad_send_wr->sg_list[1].length = data_len;
894 else
895 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
896
897 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
898
899 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
900
901 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
902 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
903 mad_send_wr->send_wr.wr.num_sge = 2;
904 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
905 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
906 mad_send_wr->send_wr.remote_qpn = remote_qpn;
907 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
908 mad_send_wr->send_wr.pkey_index = pkey_index;
909
910 if (rmpp_active) {
911 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
912 if (ret) {
913 kfree(buf);
914 return ERR_PTR(ret);
915 }
916 }
917
918 mad_send_wr->send_buf.mad_agent = mad_agent;
919 refcount_inc(&mad_agent_priv->refcount);
920 return &mad_send_wr->send_buf;
921}
922EXPORT_SYMBOL(ib_create_send_mad);
923
924int ib_get_mad_data_offset(u8 mgmt_class)
925{
926 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
927 return IB_MGMT_SA_HDR;
928 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
929 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
930 (mgmt_class == IB_MGMT_CLASS_BIS))
931 return IB_MGMT_DEVICE_HDR;
932 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
933 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
934 return IB_MGMT_VENDOR_HDR;
935 else
936 return IB_MGMT_MAD_HDR;
937}
938EXPORT_SYMBOL(ib_get_mad_data_offset);
939
940int ib_is_mad_class_rmpp(u8 mgmt_class)
941{
942 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
943 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
944 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
945 (mgmt_class == IB_MGMT_CLASS_BIS) ||
946 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
947 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
948 return 1;
949 return 0;
950}
951EXPORT_SYMBOL(ib_is_mad_class_rmpp);
952
953void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
954{
955 struct ib_mad_send_wr_private *mad_send_wr;
956 struct list_head *list;
957
958 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
959 send_buf);
960 list = &mad_send_wr->cur_seg->list;
961
962 if (mad_send_wr->cur_seg->num < seg_num) {
963 list_for_each_entry(mad_send_wr->cur_seg, list, list)
964 if (mad_send_wr->cur_seg->num == seg_num)
965 break;
966 } else if (mad_send_wr->cur_seg->num > seg_num) {
967 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
968 if (mad_send_wr->cur_seg->num == seg_num)
969 break;
970 }
971 return mad_send_wr->cur_seg->data;
972}
973EXPORT_SYMBOL(ib_get_rmpp_segment);
974
975static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
976{
977 if (mad_send_wr->send_buf.seg_count)
978 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
979 mad_send_wr->seg_num);
980 else
981 return mad_send_wr->send_buf.mad +
982 mad_send_wr->send_buf.hdr_len;
983}
984
985void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
986{
987 struct ib_mad_agent_private *mad_agent_priv;
988 struct ib_mad_send_wr_private *mad_send_wr;
989
990 mad_agent_priv = container_of(send_buf->mad_agent,
991 struct ib_mad_agent_private, agent);
992 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
993 send_buf);
994
995 free_send_rmpp_list(mad_send_wr);
996 kfree(send_buf->mad);
997 deref_mad_agent(mad_agent_priv);
998}
999EXPORT_SYMBOL(ib_free_send_mad);
1000
1001int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1002{
1003 struct ib_mad_qp_info *qp_info;
1004 struct list_head *list;
1005 struct ib_mad_agent *mad_agent;
1006 struct ib_sge *sge;
1007 unsigned long flags;
1008 int ret;
1009
1010 /* Set WR ID to find mad_send_wr upon completion */
1011 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1012 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1013 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1014 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1015
1016 mad_agent = mad_send_wr->send_buf.mad_agent;
1017 sge = mad_send_wr->sg_list;
1018 sge[0].addr = ib_dma_map_single(mad_agent->device,
1019 mad_send_wr->send_buf.mad,
1020 sge[0].length,
1021 DMA_TO_DEVICE);
1022 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1023 return -ENOMEM;
1024
1025 mad_send_wr->header_mapping = sge[0].addr;
1026
1027 sge[1].addr = ib_dma_map_single(mad_agent->device,
1028 ib_get_payload(mad_send_wr),
1029 sge[1].length,
1030 DMA_TO_DEVICE);
1031 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1032 ib_dma_unmap_single(mad_agent->device,
1033 mad_send_wr->header_mapping,
1034 sge[0].length, DMA_TO_DEVICE);
1035 return -ENOMEM;
1036 }
1037 mad_send_wr->payload_mapping = sge[1].addr;
1038
1039 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1040 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1041 trace_ib_mad_ib_send_mad(mad_send_wr, qp_info);
1042 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1043 NULL);
1044 list = &qp_info->send_queue.list;
1045 } else {
1046 ret = 0;
1047 list = &qp_info->overflow_list;
1048 }
1049
1050 if (!ret) {
1051 qp_info->send_queue.count++;
1052 list_add_tail(&mad_send_wr->mad_list.list, list);
1053 }
1054 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1055 if (ret) {
1056 ib_dma_unmap_single(mad_agent->device,
1057 mad_send_wr->header_mapping,
1058 sge[0].length, DMA_TO_DEVICE);
1059 ib_dma_unmap_single(mad_agent->device,
1060 mad_send_wr->payload_mapping,
1061 sge[1].length, DMA_TO_DEVICE);
1062 }
1063 return ret;
1064}
1065
1066/*
1067 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1068 * with the registered client
1069 */
1070int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1071 struct ib_mad_send_buf **bad_send_buf)
1072{
1073 struct ib_mad_agent_private *mad_agent_priv;
1074 struct ib_mad_send_buf *next_send_buf;
1075 struct ib_mad_send_wr_private *mad_send_wr;
1076 unsigned long flags;
1077 int ret = -EINVAL;
1078
1079 /* Walk list of send WRs and post each on send list */
1080 for (; send_buf; send_buf = next_send_buf) {
1081 mad_send_wr = container_of(send_buf,
1082 struct ib_mad_send_wr_private,
1083 send_buf);
1084 mad_agent_priv = mad_send_wr->mad_agent_priv;
1085
1086 ret = ib_mad_enforce_security(mad_agent_priv,
1087 mad_send_wr->send_wr.pkey_index);
1088 if (ret)
1089 goto error;
1090
1091 if (!send_buf->mad_agent->send_handler ||
1092 (send_buf->timeout_ms &&
1093 !send_buf->mad_agent->recv_handler)) {
1094 ret = -EINVAL;
1095 goto error;
1096 }
1097
1098 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1099 if (mad_agent_priv->agent.rmpp_version) {
1100 ret = -EINVAL;
1101 goto error;
1102 }
1103 }
1104
1105 /*
1106 * Save pointer to next work request to post in case the
1107 * current one completes, and the user modifies the work
1108 * request associated with the completion
1109 */
1110 next_send_buf = send_buf->next;
1111 mad_send_wr->send_wr.ah = send_buf->ah;
1112
1113 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1114 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1115 ret = handle_outgoing_dr_smp(mad_agent_priv,
1116 mad_send_wr);
1117 if (ret < 0) /* error */
1118 goto error;
1119 else if (ret == 1) /* locally consumed */
1120 continue;
1121 }
1122
1123 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1124 /* Timeout will be updated after send completes */
1125 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1126 mad_send_wr->max_retries = send_buf->retries;
1127 mad_send_wr->retries_left = send_buf->retries;
1128 send_buf->retries = 0;
1129 /* Reference for work request to QP + response */
1130 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1131 mad_send_wr->status = IB_WC_SUCCESS;
1132
1133 /* Reference MAD agent until send completes */
1134 refcount_inc(&mad_agent_priv->refcount);
1135 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1136 list_add_tail(&mad_send_wr->agent_list,
1137 &mad_agent_priv->send_list);
1138 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1139
1140 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1141 ret = ib_send_rmpp_mad(mad_send_wr);
1142 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1143 ret = ib_send_mad(mad_send_wr);
1144 } else
1145 ret = ib_send_mad(mad_send_wr);
1146 if (ret < 0) {
1147 /* Fail send request */
1148 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1149 list_del(&mad_send_wr->agent_list);
1150 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1151 deref_mad_agent(mad_agent_priv);
1152 goto error;
1153 }
1154 }
1155 return 0;
1156error:
1157 if (bad_send_buf)
1158 *bad_send_buf = send_buf;
1159 return ret;
1160}
1161EXPORT_SYMBOL(ib_post_send_mad);
1162
1163/*
1164 * ib_free_recv_mad - Returns data buffers used to receive
1165 * a MAD to the access layer
1166 */
1167void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1168{
1169 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1170 struct ib_mad_private_header *mad_priv_hdr;
1171 struct ib_mad_private *priv;
1172 struct list_head free_list;
1173
1174 INIT_LIST_HEAD(&free_list);
1175 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1176
1177 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1178 &free_list, list) {
1179 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1180 recv_buf);
1181 mad_priv_hdr = container_of(mad_recv_wc,
1182 struct ib_mad_private_header,
1183 recv_wc);
1184 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1185 header);
1186 kfree(priv);
1187 }
1188}
1189EXPORT_SYMBOL(ib_free_recv_mad);
1190
1191static int method_in_use(struct ib_mad_mgmt_method_table **method,
1192 struct ib_mad_reg_req *mad_reg_req)
1193{
1194 int i;
1195
1196 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1197 if ((*method)->agent[i]) {
1198 pr_err("Method %d already in use\n", i);
1199 return -EINVAL;
1200 }
1201 }
1202 return 0;
1203}
1204
1205static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1206{
1207 /* Allocate management method table */
1208 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1209 return (*method) ? 0 : (-ENOMEM);
1210}
1211
1212/*
1213 * Check to see if there are any methods still in use
1214 */
1215static int check_method_table(struct ib_mad_mgmt_method_table *method)
1216{
1217 int i;
1218
1219 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1220 if (method->agent[i])
1221 return 1;
1222 return 0;
1223}
1224
1225/*
1226 * Check to see if there are any method tables for this class still in use
1227 */
1228static int check_class_table(struct ib_mad_mgmt_class_table *class)
1229{
1230 int i;
1231
1232 for (i = 0; i < MAX_MGMT_CLASS; i++)
1233 if (class->method_table[i])
1234 return 1;
1235 return 0;
1236}
1237
1238static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1239{
1240 int i;
1241
1242 for (i = 0; i < MAX_MGMT_OUI; i++)
1243 if (vendor_class->method_table[i])
1244 return 1;
1245 return 0;
1246}
1247
1248static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1249 const char *oui)
1250{
1251 int i;
1252
1253 for (i = 0; i < MAX_MGMT_OUI; i++)
1254 /* Is there matching OUI for this vendor class ? */
1255 if (!memcmp(vendor_class->oui[i], oui, 3))
1256 return i;
1257
1258 return -1;
1259}
1260
1261static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1262{
1263 int i;
1264
1265 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1266 if (vendor->vendor_class[i])
1267 return 1;
1268
1269 return 0;
1270}
1271
1272static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1273 struct ib_mad_agent_private *agent)
1274{
1275 int i;
1276
1277 /* Remove any methods for this mad agent */
1278 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1279 if (method->agent[i] == agent) {
1280 method->agent[i] = NULL;
1281 }
1282 }
1283}
1284
1285static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1286 struct ib_mad_agent_private *agent_priv,
1287 u8 mgmt_class)
1288{
1289 struct ib_mad_port_private *port_priv;
1290 struct ib_mad_mgmt_class_table **class;
1291 struct ib_mad_mgmt_method_table **method;
1292 int i, ret;
1293
1294 port_priv = agent_priv->qp_info->port_priv;
1295 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1296 if (!*class) {
1297 /* Allocate management class table for "new" class version */
1298 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1299 if (!*class) {
1300 ret = -ENOMEM;
1301 goto error1;
1302 }
1303
1304 /* Allocate method table for this management class */
1305 method = &(*class)->method_table[mgmt_class];
1306 if ((ret = allocate_method_table(method)))
1307 goto error2;
1308 } else {
1309 method = &(*class)->method_table[mgmt_class];
1310 if (!*method) {
1311 /* Allocate method table for this management class */
1312 if ((ret = allocate_method_table(method)))
1313 goto error1;
1314 }
1315 }
1316
1317 /* Now, make sure methods are not already in use */
1318 if (method_in_use(method, mad_reg_req))
1319 goto error3;
1320
1321 /* Finally, add in methods being registered */
1322 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1323 (*method)->agent[i] = agent_priv;
1324
1325 return 0;
1326
1327error3:
1328 /* Remove any methods for this mad agent */
1329 remove_methods_mad_agent(*method, agent_priv);
1330 /* Now, check to see if there are any methods in use */
1331 if (!check_method_table(*method)) {
1332 /* If not, release management method table */
1333 kfree(*method);
1334 *method = NULL;
1335 }
1336 ret = -EINVAL;
1337 goto error1;
1338error2:
1339 kfree(*class);
1340 *class = NULL;
1341error1:
1342 return ret;
1343}
1344
1345static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1346 struct ib_mad_agent_private *agent_priv)
1347{
1348 struct ib_mad_port_private *port_priv;
1349 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1350 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1351 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1352 struct ib_mad_mgmt_method_table **method;
1353 int i, ret = -ENOMEM;
1354 u8 vclass;
1355
1356 /* "New" vendor (with OUI) class */
1357 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1358 port_priv = agent_priv->qp_info->port_priv;
1359 vendor_table = &port_priv->version[
1360 mad_reg_req->mgmt_class_version].vendor;
1361 if (!*vendor_table) {
1362 /* Allocate mgmt vendor class table for "new" class version */
1363 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1364 if (!vendor)
1365 goto error1;
1366
1367 *vendor_table = vendor;
1368 }
1369 if (!(*vendor_table)->vendor_class[vclass]) {
1370 /* Allocate table for this management vendor class */
1371 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1372 if (!vendor_class)
1373 goto error2;
1374
1375 (*vendor_table)->vendor_class[vclass] = vendor_class;
1376 }
1377 for (i = 0; i < MAX_MGMT_OUI; i++) {
1378 /* Is there matching OUI for this vendor class ? */
1379 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1380 mad_reg_req->oui, 3)) {
1381 method = &(*vendor_table)->vendor_class[
1382 vclass]->method_table[i];
1383 if (!*method)
1384 goto error3;
1385 goto check_in_use;
1386 }
1387 }
1388 for (i = 0; i < MAX_MGMT_OUI; i++) {
1389 /* OUI slot available ? */
1390 if (!is_vendor_oui((*vendor_table)->vendor_class[
1391 vclass]->oui[i])) {
1392 method = &(*vendor_table)->vendor_class[
1393 vclass]->method_table[i];
1394 /* Allocate method table for this OUI */
1395 if (!*method) {
1396 ret = allocate_method_table(method);
1397 if (ret)
1398 goto error3;
1399 }
1400 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1401 mad_reg_req->oui, 3);
1402 goto check_in_use;
1403 }
1404 }
1405 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1406 goto error3;
1407
1408check_in_use:
1409 /* Now, make sure methods are not already in use */
1410 if (method_in_use(method, mad_reg_req))
1411 goto error4;
1412
1413 /* Finally, add in methods being registered */
1414 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1415 (*method)->agent[i] = agent_priv;
1416
1417 return 0;
1418
1419error4:
1420 /* Remove any methods for this mad agent */
1421 remove_methods_mad_agent(*method, agent_priv);
1422 /* Now, check to see if there are any methods in use */
1423 if (!check_method_table(*method)) {
1424 /* If not, release management method table */
1425 kfree(*method);
1426 *method = NULL;
1427 }
1428 ret = -EINVAL;
1429error3:
1430 if (vendor_class) {
1431 (*vendor_table)->vendor_class[vclass] = NULL;
1432 kfree(vendor_class);
1433 }
1434error2:
1435 if (vendor) {
1436 *vendor_table = NULL;
1437 kfree(vendor);
1438 }
1439error1:
1440 return ret;
1441}
1442
1443static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1444{
1445 struct ib_mad_port_private *port_priv;
1446 struct ib_mad_mgmt_class_table *class;
1447 struct ib_mad_mgmt_method_table *method;
1448 struct ib_mad_mgmt_vendor_class_table *vendor;
1449 struct ib_mad_mgmt_vendor_class *vendor_class;
1450 int index;
1451 u8 mgmt_class;
1452
1453 /*
1454 * Was MAD registration request supplied
1455 * with original registration ?
1456 */
1457 if (!agent_priv->reg_req) {
1458 goto out;
1459 }
1460
1461 port_priv = agent_priv->qp_info->port_priv;
1462 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1463 class = port_priv->version[
1464 agent_priv->reg_req->mgmt_class_version].class;
1465 if (!class)
1466 goto vendor_check;
1467
1468 method = class->method_table[mgmt_class];
1469 if (method) {
1470 /* Remove any methods for this mad agent */
1471 remove_methods_mad_agent(method, agent_priv);
1472 /* Now, check to see if there are any methods still in use */
1473 if (!check_method_table(method)) {
1474 /* If not, release management method table */
1475 kfree(method);
1476 class->method_table[mgmt_class] = NULL;
1477 /* Any management classes left ? */
1478 if (!check_class_table(class)) {
1479 /* If not, release management class table */
1480 kfree(class);
1481 port_priv->version[
1482 agent_priv->reg_req->
1483 mgmt_class_version].class = NULL;
1484 }
1485 }
1486 }
1487
1488vendor_check:
1489 if (!is_vendor_class(mgmt_class))
1490 goto out;
1491
1492 /* normalize mgmt_class to vendor range 2 */
1493 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1494 vendor = port_priv->version[
1495 agent_priv->reg_req->mgmt_class_version].vendor;
1496
1497 if (!vendor)
1498 goto out;
1499
1500 vendor_class = vendor->vendor_class[mgmt_class];
1501 if (vendor_class) {
1502 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1503 if (index < 0)
1504 goto out;
1505 method = vendor_class->method_table[index];
1506 if (method) {
1507 /* Remove any methods for this mad agent */
1508 remove_methods_mad_agent(method, agent_priv);
1509 /*
1510 * Now, check to see if there are
1511 * any methods still in use
1512 */
1513 if (!check_method_table(method)) {
1514 /* If not, release management method table */
1515 kfree(method);
1516 vendor_class->method_table[index] = NULL;
1517 memset(vendor_class->oui[index], 0, 3);
1518 /* Any OUIs left ? */
1519 if (!check_vendor_class(vendor_class)) {
1520 /* If not, release vendor class table */
1521 kfree(vendor_class);
1522 vendor->vendor_class[mgmt_class] = NULL;
1523 /* Any other vendor classes left ? */
1524 if (!check_vendor_table(vendor)) {
1525 kfree(vendor);
1526 port_priv->version[
1527 agent_priv->reg_req->
1528 mgmt_class_version].
1529 vendor = NULL;
1530 }
1531 }
1532 }
1533 }
1534 }
1535
1536out:
1537 return;
1538}
1539
1540static struct ib_mad_agent_private *
1541find_mad_agent(struct ib_mad_port_private *port_priv,
1542 const struct ib_mad_hdr *mad_hdr)
1543{
1544 struct ib_mad_agent_private *mad_agent = NULL;
1545 unsigned long flags;
1546
1547 if (ib_response_mad(mad_hdr)) {
1548 u32 hi_tid;
1549
1550 /*
1551 * Routing is based on high 32 bits of transaction ID
1552 * of MAD.
1553 */
1554 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1555 rcu_read_lock();
1556 mad_agent = xa_load(&ib_mad_clients, hi_tid);
1557 if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount))
1558 mad_agent = NULL;
1559 rcu_read_unlock();
1560 } else {
1561 struct ib_mad_mgmt_class_table *class;
1562 struct ib_mad_mgmt_method_table *method;
1563 struct ib_mad_mgmt_vendor_class_table *vendor;
1564 struct ib_mad_mgmt_vendor_class *vendor_class;
1565 const struct ib_vendor_mad *vendor_mad;
1566 int index;
1567
1568 spin_lock_irqsave(&port_priv->reg_lock, flags);
1569 /*
1570 * Routing is based on version, class, and method
1571 * For "newer" vendor MADs, also based on OUI
1572 */
1573 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1574 goto out;
1575 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1576 class = port_priv->version[
1577 mad_hdr->class_version].class;
1578 if (!class)
1579 goto out;
1580 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1581 ARRAY_SIZE(class->method_table))
1582 goto out;
1583 method = class->method_table[convert_mgmt_class(
1584 mad_hdr->mgmt_class)];
1585 if (method)
1586 mad_agent = method->agent[mad_hdr->method &
1587 ~IB_MGMT_METHOD_RESP];
1588 } else {
1589 vendor = port_priv->version[
1590 mad_hdr->class_version].vendor;
1591 if (!vendor)
1592 goto out;
1593 vendor_class = vendor->vendor_class[vendor_class_index(
1594 mad_hdr->mgmt_class)];
1595 if (!vendor_class)
1596 goto out;
1597 /* Find matching OUI */
1598 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1599 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1600 if (index == -1)
1601 goto out;
1602 method = vendor_class->method_table[index];
1603 if (method) {
1604 mad_agent = method->agent[mad_hdr->method &
1605 ~IB_MGMT_METHOD_RESP];
1606 }
1607 }
1608 if (mad_agent)
1609 refcount_inc(&mad_agent->refcount);
1610out:
1611 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1612 }
1613
1614 if (mad_agent && !mad_agent->agent.recv_handler) {
1615 dev_notice(&port_priv->device->dev,
1616 "No receive handler for client %p on port %d\n",
1617 &mad_agent->agent, port_priv->port_num);
1618 deref_mad_agent(mad_agent);
1619 mad_agent = NULL;
1620 }
1621
1622 return mad_agent;
1623}
1624
1625static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1626 const struct ib_mad_qp_info *qp_info,
1627 bool opa)
1628{
1629 int valid = 0;
1630 u32 qp_num = qp_info->qp->qp_num;
1631
1632 /* Make sure MAD base version is understood */
1633 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1634 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1635 pr_err("MAD received with unsupported base version %d %s\n",
1636 mad_hdr->base_version, opa ? "(opa)" : "");
1637 goto out;
1638 }
1639
1640 /* Filter SMI packets sent to other than QP0 */
1641 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1642 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1643 if (qp_num == 0)
1644 valid = 1;
1645 } else {
1646 /* CM attributes other than ClassPortInfo only use Send method */
1647 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1648 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1649 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1650 goto out;
1651 /* Filter GSI packets sent to QP0 */
1652 if (qp_num != 0)
1653 valid = 1;
1654 }
1655
1656out:
1657 return valid;
1658}
1659
1660static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1661 const struct ib_mad_hdr *mad_hdr)
1662{
1663 struct ib_rmpp_mad *rmpp_mad;
1664
1665 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1666 return !mad_agent_priv->agent.rmpp_version ||
1667 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1668 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1669 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1670 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1671}
1672
1673static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1674 const struct ib_mad_recv_wc *rwc)
1675{
1676 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1677 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1678}
1679
1680static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1681 const struct ib_mad_send_wr_private *wr,
1682 const struct ib_mad_recv_wc *rwc )
1683{
1684 struct rdma_ah_attr attr;
1685 u8 send_resp, rcv_resp;
1686 union ib_gid sgid;
1687 struct ib_device *device = mad_agent_priv->agent.device;
1688 u8 port_num = mad_agent_priv->agent.port_num;
1689 u8 lmc;
1690 bool has_grh;
1691
1692 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1693 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1694
1695 if (send_resp == rcv_resp)
1696 /* both requests, or both responses. GIDs different */
1697 return 0;
1698
1699 if (rdma_query_ah(wr->send_buf.ah, &attr))
1700 /* Assume not equal, to avoid false positives. */
1701 return 0;
1702
1703 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1704 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1705 /* one has GID, other does not. Assume different */
1706 return 0;
1707
1708 if (!send_resp && rcv_resp) {
1709 /* is request/response. */
1710 if (!has_grh) {
1711 if (ib_get_cached_lmc(device, port_num, &lmc))
1712 return 0;
1713 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1714 rwc->wc->dlid_path_bits) &
1715 ((1 << lmc) - 1)));
1716 } else {
1717 const struct ib_global_route *grh =
1718 rdma_ah_read_grh(&attr);
1719
1720 if (rdma_query_gid(device, port_num,
1721 grh->sgid_index, &sgid))
1722 return 0;
1723 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1724 16);
1725 }
1726 }
1727
1728 if (!has_grh)
1729 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1730 else
1731 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1732 rwc->recv_buf.grh->sgid.raw,
1733 16);
1734}
1735
1736static inline int is_direct(u8 class)
1737{
1738 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1739}
1740
1741struct ib_mad_send_wr_private*
1742ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1743 const struct ib_mad_recv_wc *wc)
1744{
1745 struct ib_mad_send_wr_private *wr;
1746 const struct ib_mad_hdr *mad_hdr;
1747
1748 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1749
1750 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1751 if ((wr->tid == mad_hdr->tid) &&
1752 rcv_has_same_class(wr, wc) &&
1753 /*
1754 * Don't check GID for direct routed MADs.
1755 * These might have permissive LIDs.
1756 */
1757 (is_direct(mad_hdr->mgmt_class) ||
1758 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1759 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1760 }
1761
1762 /*
1763 * It's possible to receive the response before we've
1764 * been notified that the send has completed
1765 */
1766 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1767 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1768 wr->tid == mad_hdr->tid &&
1769 wr->timeout &&
1770 rcv_has_same_class(wr, wc) &&
1771 /*
1772 * Don't check GID for direct routed MADs.
1773 * These might have permissive LIDs.
1774 */
1775 (is_direct(mad_hdr->mgmt_class) ||
1776 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1777 /* Verify request has not been canceled */
1778 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1779 }
1780 return NULL;
1781}
1782
1783void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1784{
1785 mad_send_wr->timeout = 0;
1786 if (mad_send_wr->refcount == 1)
1787 list_move_tail(&mad_send_wr->agent_list,
1788 &mad_send_wr->mad_agent_priv->done_list);
1789}
1790
1791static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1792 struct ib_mad_recv_wc *mad_recv_wc)
1793{
1794 struct ib_mad_send_wr_private *mad_send_wr;
1795 struct ib_mad_send_wc mad_send_wc;
1796 unsigned long flags;
1797 int ret;
1798
1799 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1800 ret = ib_mad_enforce_security(mad_agent_priv,
1801 mad_recv_wc->wc->pkey_index);
1802 if (ret) {
1803 ib_free_recv_mad(mad_recv_wc);
1804 deref_mad_agent(mad_agent_priv);
1805 return;
1806 }
1807
1808 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1809 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1810 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1811 mad_recv_wc);
1812 if (!mad_recv_wc) {
1813 deref_mad_agent(mad_agent_priv);
1814 return;
1815 }
1816 }
1817
1818 /* Complete corresponding request */
1819 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1820 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1821 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1822 if (!mad_send_wr) {
1823 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1824 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1825 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1826 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1827 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1828 /* user rmpp is in effect
1829 * and this is an active RMPP MAD
1830 */
1831 mad_agent_priv->agent.recv_handler(
1832 &mad_agent_priv->agent, NULL,
1833 mad_recv_wc);
1834 deref_mad_agent(mad_agent_priv);
1835 } else {
1836 /* not user rmpp, revert to normal behavior and
1837 * drop the mad */
1838 ib_free_recv_mad(mad_recv_wc);
1839 deref_mad_agent(mad_agent_priv);
1840 return;
1841 }
1842 } else {
1843 ib_mark_mad_done(mad_send_wr);
1844 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1845
1846 /* Defined behavior is to complete response before request */
1847 mad_agent_priv->agent.recv_handler(
1848 &mad_agent_priv->agent,
1849 &mad_send_wr->send_buf,
1850 mad_recv_wc);
1851 deref_mad_agent(mad_agent_priv);
1852
1853 mad_send_wc.status = IB_WC_SUCCESS;
1854 mad_send_wc.vendor_err = 0;
1855 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1856 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1857 }
1858 } else {
1859 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
1860 mad_recv_wc);
1861 deref_mad_agent(mad_agent_priv);
1862 }
1863
1864 return;
1865}
1866
1867static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
1868 const struct ib_mad_qp_info *qp_info,
1869 const struct ib_wc *wc,
1870 int port_num,
1871 struct ib_mad_private *recv,
1872 struct ib_mad_private *response)
1873{
1874 enum smi_forward_action retsmi;
1875 struct ib_smp *smp = (struct ib_smp *)recv->mad;
1876
1877 trace_ib_mad_handle_ib_smi(smp);
1878
1879 if (smi_handle_dr_smp_recv(smp,
1880 rdma_cap_ib_switch(port_priv->device),
1881 port_num,
1882 port_priv->device->phys_port_cnt) ==
1883 IB_SMI_DISCARD)
1884 return IB_SMI_DISCARD;
1885
1886 retsmi = smi_check_forward_dr_smp(smp);
1887 if (retsmi == IB_SMI_LOCAL)
1888 return IB_SMI_HANDLE;
1889
1890 if (retsmi == IB_SMI_SEND) { /* don't forward */
1891 if (smi_handle_dr_smp_send(smp,
1892 rdma_cap_ib_switch(port_priv->device),
1893 port_num) == IB_SMI_DISCARD)
1894 return IB_SMI_DISCARD;
1895
1896 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
1897 return IB_SMI_DISCARD;
1898 } else if (rdma_cap_ib_switch(port_priv->device)) {
1899 /* forward case for switches */
1900 memcpy(response, recv, mad_priv_size(response));
1901 response->header.recv_wc.wc = &response->header.wc;
1902 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1903 response->header.recv_wc.recv_buf.grh = &response->grh;
1904
1905 agent_send_response((const struct ib_mad_hdr *)response->mad,
1906 &response->grh, wc,
1907 port_priv->device,
1908 smi_get_fwd_port(smp),
1909 qp_info->qp->qp_num,
1910 response->mad_size,
1911 false);
1912
1913 return IB_SMI_DISCARD;
1914 }
1915 return IB_SMI_HANDLE;
1916}
1917
1918static bool generate_unmatched_resp(const struct ib_mad_private *recv,
1919 struct ib_mad_private *response,
1920 size_t *resp_len, bool opa)
1921{
1922 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
1923 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
1924
1925 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
1926 recv_hdr->method == IB_MGMT_METHOD_SET) {
1927 memcpy(response, recv, mad_priv_size(response));
1928 response->header.recv_wc.wc = &response->header.wc;
1929 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1930 response->header.recv_wc.recv_buf.grh = &response->grh;
1931 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
1932 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1933 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1934 resp_hdr->status |= IB_SMP_DIRECTION;
1935
1936 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
1937 if (recv_hdr->mgmt_class ==
1938 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
1939 recv_hdr->mgmt_class ==
1940 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1941 *resp_len = opa_get_smp_header_size(
1942 (struct opa_smp *)recv->mad);
1943 else
1944 *resp_len = sizeof(struct ib_mad_hdr);
1945 }
1946
1947 return true;
1948 } else {
1949 return false;
1950 }
1951}
1952
1953static enum smi_action
1954handle_opa_smi(struct ib_mad_port_private *port_priv,
1955 struct ib_mad_qp_info *qp_info,
1956 struct ib_wc *wc,
1957 int port_num,
1958 struct ib_mad_private *recv,
1959 struct ib_mad_private *response)
1960{
1961 enum smi_forward_action retsmi;
1962 struct opa_smp *smp = (struct opa_smp *)recv->mad;
1963
1964 trace_ib_mad_handle_opa_smi(smp);
1965
1966 if (opa_smi_handle_dr_smp_recv(smp,
1967 rdma_cap_ib_switch(port_priv->device),
1968 port_num,
1969 port_priv->device->phys_port_cnt) ==
1970 IB_SMI_DISCARD)
1971 return IB_SMI_DISCARD;
1972
1973 retsmi = opa_smi_check_forward_dr_smp(smp);
1974 if (retsmi == IB_SMI_LOCAL)
1975 return IB_SMI_HANDLE;
1976
1977 if (retsmi == IB_SMI_SEND) { /* don't forward */
1978 if (opa_smi_handle_dr_smp_send(smp,
1979 rdma_cap_ib_switch(port_priv->device),
1980 port_num) == IB_SMI_DISCARD)
1981 return IB_SMI_DISCARD;
1982
1983 if (opa_smi_check_local_smp(smp, port_priv->device) ==
1984 IB_SMI_DISCARD)
1985 return IB_SMI_DISCARD;
1986
1987 } else if (rdma_cap_ib_switch(port_priv->device)) {
1988 /* forward case for switches */
1989 memcpy(response, recv, mad_priv_size(response));
1990 response->header.recv_wc.wc = &response->header.wc;
1991 response->header.recv_wc.recv_buf.opa_mad =
1992 (struct opa_mad *)response->mad;
1993 response->header.recv_wc.recv_buf.grh = &response->grh;
1994
1995 agent_send_response((const struct ib_mad_hdr *)response->mad,
1996 &response->grh, wc,
1997 port_priv->device,
1998 opa_smi_get_fwd_port(smp),
1999 qp_info->qp->qp_num,
2000 recv->header.wc.byte_len,
2001 true);
2002
2003 return IB_SMI_DISCARD;
2004 }
2005
2006 return IB_SMI_HANDLE;
2007}
2008
2009static enum smi_action
2010handle_smi(struct ib_mad_port_private *port_priv,
2011 struct ib_mad_qp_info *qp_info,
2012 struct ib_wc *wc,
2013 int port_num,
2014 struct ib_mad_private *recv,
2015 struct ib_mad_private *response,
2016 bool opa)
2017{
2018 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2019
2020 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2021 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2022 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2023 response);
2024
2025 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2026}
2027
2028static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2029{
2030 struct ib_mad_port_private *port_priv = cq->cq_context;
2031 struct ib_mad_list_head *mad_list =
2032 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2033 struct ib_mad_qp_info *qp_info;
2034 struct ib_mad_private_header *mad_priv_hdr;
2035 struct ib_mad_private *recv, *response = NULL;
2036 struct ib_mad_agent_private *mad_agent;
2037 int port_num;
2038 int ret = IB_MAD_RESULT_SUCCESS;
2039 size_t mad_size;
2040 u16 resp_mad_pkey_index = 0;
2041 bool opa;
2042
2043 if (list_empty_careful(&port_priv->port_list))
2044 return;
2045
2046 if (wc->status != IB_WC_SUCCESS) {
2047 /*
2048 * Receive errors indicate that the QP has entered the error
2049 * state - error handling/shutdown code will cleanup
2050 */
2051 return;
2052 }
2053
2054 qp_info = mad_list->mad_queue->qp_info;
2055 dequeue_mad(mad_list);
2056
2057 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2058 qp_info->port_priv->port_num);
2059
2060 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2061 mad_list);
2062 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2063 ib_dma_unmap_single(port_priv->device,
2064 recv->header.mapping,
2065 mad_priv_dma_size(recv),
2066 DMA_FROM_DEVICE);
2067
2068 /* Setup MAD receive work completion from "normal" work completion */
2069 recv->header.wc = *wc;
2070 recv->header.recv_wc.wc = &recv->header.wc;
2071
2072 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2073 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2074 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2075 } else {
2076 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2077 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2078 }
2079
2080 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2081 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2082
2083 /* Validate MAD */
2084 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2085 goto out;
2086
2087 trace_ib_mad_recv_done_handler(qp_info, wc,
2088 (struct ib_mad_hdr *)recv->mad);
2089
2090 mad_size = recv->mad_size;
2091 response = alloc_mad_private(mad_size, GFP_KERNEL);
2092 if (!response)
2093 goto out;
2094
2095 if (rdma_cap_ib_switch(port_priv->device))
2096 port_num = wc->port_num;
2097 else
2098 port_num = port_priv->port_num;
2099
2100 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2101 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2102 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2103 response, opa)
2104 == IB_SMI_DISCARD)
2105 goto out;
2106 }
2107
2108 /* Give driver "right of first refusal" on incoming MAD */
2109 if (port_priv->device->ops.process_mad) {
2110 ret = port_priv->device->ops.process_mad(
2111 port_priv->device, 0, port_priv->port_num, wc,
2112 &recv->grh, (const struct ib_mad *)recv->mad,
2113 (struct ib_mad *)response->mad, &mad_size,
2114 &resp_mad_pkey_index);
2115
2116 if (opa)
2117 wc->pkey_index = resp_mad_pkey_index;
2118
2119 if (ret & IB_MAD_RESULT_SUCCESS) {
2120 if (ret & IB_MAD_RESULT_CONSUMED)
2121 goto out;
2122 if (ret & IB_MAD_RESULT_REPLY) {
2123 agent_send_response((const struct ib_mad_hdr *)response->mad,
2124 &recv->grh, wc,
2125 port_priv->device,
2126 port_num,
2127 qp_info->qp->qp_num,
2128 mad_size, opa);
2129 goto out;
2130 }
2131 }
2132 }
2133
2134 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2135 if (mad_agent) {
2136 trace_ib_mad_recv_done_agent(mad_agent);
2137 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2138 /*
2139 * recv is freed up in error cases in ib_mad_complete_recv
2140 * or via recv_handler in ib_mad_complete_recv()
2141 */
2142 recv = NULL;
2143 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2144 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2145 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2146 port_priv->device, port_num,
2147 qp_info->qp->qp_num, mad_size, opa);
2148 }
2149
2150out:
2151 /* Post another receive request for this QP */
2152 if (response) {
2153 ib_mad_post_receive_mads(qp_info, response);
2154 kfree(recv);
2155 } else
2156 ib_mad_post_receive_mads(qp_info, recv);
2157}
2158
2159static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2160{
2161 struct ib_mad_send_wr_private *mad_send_wr;
2162 unsigned long delay;
2163
2164 if (list_empty(&mad_agent_priv->wait_list)) {
2165 cancel_delayed_work(&mad_agent_priv->timed_work);
2166 } else {
2167 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2168 struct ib_mad_send_wr_private,
2169 agent_list);
2170
2171 if (time_after(mad_agent_priv->timeout,
2172 mad_send_wr->timeout)) {
2173 mad_agent_priv->timeout = mad_send_wr->timeout;
2174 delay = mad_send_wr->timeout - jiffies;
2175 if ((long)delay <= 0)
2176 delay = 1;
2177 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2178 &mad_agent_priv->timed_work, delay);
2179 }
2180 }
2181}
2182
2183static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2184{
2185 struct ib_mad_agent_private *mad_agent_priv;
2186 struct ib_mad_send_wr_private *temp_mad_send_wr;
2187 struct list_head *list_item;
2188 unsigned long delay;
2189
2190 mad_agent_priv = mad_send_wr->mad_agent_priv;
2191 list_del(&mad_send_wr->agent_list);
2192
2193 delay = mad_send_wr->timeout;
2194 mad_send_wr->timeout += jiffies;
2195
2196 if (delay) {
2197 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2198 temp_mad_send_wr = list_entry(list_item,
2199 struct ib_mad_send_wr_private,
2200 agent_list);
2201 if (time_after(mad_send_wr->timeout,
2202 temp_mad_send_wr->timeout))
2203 break;
2204 }
2205 }
2206 else
2207 list_item = &mad_agent_priv->wait_list;
2208 list_add(&mad_send_wr->agent_list, list_item);
2209
2210 /* Reschedule a work item if we have a shorter timeout */
2211 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2212 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2213 &mad_agent_priv->timed_work, delay);
2214}
2215
2216void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2217 unsigned long timeout_ms)
2218{
2219 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2220 wait_for_response(mad_send_wr);
2221}
2222
2223/*
2224 * Process a send work completion
2225 */
2226void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2227 struct ib_mad_send_wc *mad_send_wc)
2228{
2229 struct ib_mad_agent_private *mad_agent_priv;
2230 unsigned long flags;
2231 int ret;
2232
2233 mad_agent_priv = mad_send_wr->mad_agent_priv;
2234 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2235 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2236 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2237 if (ret == IB_RMPP_RESULT_CONSUMED)
2238 goto done;
2239 } else
2240 ret = IB_RMPP_RESULT_UNHANDLED;
2241
2242 if (mad_send_wc->status != IB_WC_SUCCESS &&
2243 mad_send_wr->status == IB_WC_SUCCESS) {
2244 mad_send_wr->status = mad_send_wc->status;
2245 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2246 }
2247
2248 if (--mad_send_wr->refcount > 0) {
2249 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2250 mad_send_wr->status == IB_WC_SUCCESS) {
2251 wait_for_response(mad_send_wr);
2252 }
2253 goto done;
2254 }
2255
2256 /* Remove send from MAD agent and notify client of completion */
2257 list_del(&mad_send_wr->agent_list);
2258 adjust_timeout(mad_agent_priv);
2259 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2260
2261 if (mad_send_wr->status != IB_WC_SUCCESS )
2262 mad_send_wc->status = mad_send_wr->status;
2263 if (ret == IB_RMPP_RESULT_INTERNAL)
2264 ib_rmpp_send_handler(mad_send_wc);
2265 else
2266 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2267 mad_send_wc);
2268
2269 /* Release reference on agent taken when sending */
2270 deref_mad_agent(mad_agent_priv);
2271 return;
2272done:
2273 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2274}
2275
2276static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2277{
2278 struct ib_mad_port_private *port_priv = cq->cq_context;
2279 struct ib_mad_list_head *mad_list =
2280 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2281 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2282 struct ib_mad_qp_info *qp_info;
2283 struct ib_mad_queue *send_queue;
2284 struct ib_mad_send_wc mad_send_wc;
2285 unsigned long flags;
2286 int ret;
2287
2288 if (list_empty_careful(&port_priv->port_list))
2289 return;
2290
2291 if (wc->status != IB_WC_SUCCESS) {
2292 if (!ib_mad_send_error(port_priv, wc))
2293 return;
2294 }
2295
2296 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2297 mad_list);
2298 send_queue = mad_list->mad_queue;
2299 qp_info = send_queue->qp_info;
2300
2301 trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
2302 trace_ib_mad_send_done_handler(mad_send_wr, wc);
2303
2304retry:
2305 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2306 mad_send_wr->header_mapping,
2307 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2308 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2309 mad_send_wr->payload_mapping,
2310 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2311 queued_send_wr = NULL;
2312 spin_lock_irqsave(&send_queue->lock, flags);
2313 list_del(&mad_list->list);
2314
2315 /* Move queued send to the send queue */
2316 if (send_queue->count-- > send_queue->max_active) {
2317 mad_list = container_of(qp_info->overflow_list.next,
2318 struct ib_mad_list_head, list);
2319 queued_send_wr = container_of(mad_list,
2320 struct ib_mad_send_wr_private,
2321 mad_list);
2322 list_move_tail(&mad_list->list, &send_queue->list);
2323 }
2324 spin_unlock_irqrestore(&send_queue->lock, flags);
2325
2326 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2327 mad_send_wc.status = wc->status;
2328 mad_send_wc.vendor_err = wc->vendor_err;
2329 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2330
2331 if (queued_send_wr) {
2332 trace_ib_mad_send_done_resend(queued_send_wr, qp_info);
2333 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2334 NULL);
2335 if (ret) {
2336 dev_err(&port_priv->device->dev,
2337 "ib_post_send failed: %d\n", ret);
2338 mad_send_wr = queued_send_wr;
2339 wc->status = IB_WC_LOC_QP_OP_ERR;
2340 goto retry;
2341 }
2342 }
2343}
2344
2345static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2346{
2347 struct ib_mad_send_wr_private *mad_send_wr;
2348 struct ib_mad_list_head *mad_list;
2349 unsigned long flags;
2350
2351 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2352 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2353 mad_send_wr = container_of(mad_list,
2354 struct ib_mad_send_wr_private,
2355 mad_list);
2356 mad_send_wr->retry = 1;
2357 }
2358 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2359}
2360
2361static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2362 struct ib_wc *wc)
2363{
2364 struct ib_mad_list_head *mad_list =
2365 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2366 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2367 struct ib_mad_send_wr_private *mad_send_wr;
2368 int ret;
2369
2370 /*
2371 * Send errors will transition the QP to SQE - move
2372 * QP to RTS and repost flushed work requests
2373 */
2374 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2375 mad_list);
2376 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2377 if (mad_send_wr->retry) {
2378 /* Repost send */
2379 mad_send_wr->retry = 0;
2380 trace_ib_mad_error_handler(mad_send_wr, qp_info);
2381 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2382 NULL);
2383 if (!ret)
2384 return false;
2385 }
2386 } else {
2387 struct ib_qp_attr *attr;
2388
2389 /* Transition QP to RTS and fail offending send */
2390 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2391 if (attr) {
2392 attr->qp_state = IB_QPS_RTS;
2393 attr->cur_qp_state = IB_QPS_SQE;
2394 ret = ib_modify_qp(qp_info->qp, attr,
2395 IB_QP_STATE | IB_QP_CUR_STATE);
2396 kfree(attr);
2397 if (ret)
2398 dev_err(&port_priv->device->dev,
2399 "%s - ib_modify_qp to RTS: %d\n",
2400 __func__, ret);
2401 else
2402 mark_sends_for_retry(qp_info);
2403 }
2404 }
2405
2406 return true;
2407}
2408
2409static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2410{
2411 unsigned long flags;
2412 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2413 struct ib_mad_send_wc mad_send_wc;
2414 struct list_head cancel_list;
2415
2416 INIT_LIST_HEAD(&cancel_list);
2417
2418 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2419 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2420 &mad_agent_priv->send_list, agent_list) {
2421 if (mad_send_wr->status == IB_WC_SUCCESS) {
2422 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2423 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2424 }
2425 }
2426
2427 /* Empty wait list to prevent receives from finding a request */
2428 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2429 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2430
2431 /* Report all cancelled requests */
2432 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2433 mad_send_wc.vendor_err = 0;
2434
2435 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2436 &cancel_list, agent_list) {
2437 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2438 list_del(&mad_send_wr->agent_list);
2439 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2440 &mad_send_wc);
2441 deref_mad_agent(mad_agent_priv);
2442 }
2443}
2444
2445static struct ib_mad_send_wr_private*
2446find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2447 struct ib_mad_send_buf *send_buf)
2448{
2449 struct ib_mad_send_wr_private *mad_send_wr;
2450
2451 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2452 agent_list) {
2453 if (&mad_send_wr->send_buf == send_buf)
2454 return mad_send_wr;
2455 }
2456
2457 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2458 agent_list) {
2459 if (is_rmpp_data_mad(mad_agent_priv,
2460 mad_send_wr->send_buf.mad) &&
2461 &mad_send_wr->send_buf == send_buf)
2462 return mad_send_wr;
2463 }
2464 return NULL;
2465}
2466
2467int ib_modify_mad(struct ib_mad_agent *mad_agent,
2468 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2469{
2470 struct ib_mad_agent_private *mad_agent_priv;
2471 struct ib_mad_send_wr_private *mad_send_wr;
2472 unsigned long flags;
2473 int active;
2474
2475 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2476 agent);
2477 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2478 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2479 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2480 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2481 return -EINVAL;
2482 }
2483
2484 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2485 if (!timeout_ms) {
2486 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2487 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2488 }
2489
2490 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2491 if (active)
2492 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2493 else
2494 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2495
2496 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2497 return 0;
2498}
2499EXPORT_SYMBOL(ib_modify_mad);
2500
2501void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2502 struct ib_mad_send_buf *send_buf)
2503{
2504 ib_modify_mad(mad_agent, send_buf, 0);
2505}
2506EXPORT_SYMBOL(ib_cancel_mad);
2507
2508static void local_completions(struct work_struct *work)
2509{
2510 struct ib_mad_agent_private *mad_agent_priv;
2511 struct ib_mad_local_private *local;
2512 struct ib_mad_agent_private *recv_mad_agent;
2513 unsigned long flags;
2514 int free_mad;
2515 struct ib_wc wc;
2516 struct ib_mad_send_wc mad_send_wc;
2517 bool opa;
2518
2519 mad_agent_priv =
2520 container_of(work, struct ib_mad_agent_private, local_work);
2521
2522 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2523 mad_agent_priv->qp_info->port_priv->port_num);
2524
2525 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2526 while (!list_empty(&mad_agent_priv->local_list)) {
2527 local = list_entry(mad_agent_priv->local_list.next,
2528 struct ib_mad_local_private,
2529 completion_list);
2530 list_del(&local->completion_list);
2531 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2532 free_mad = 0;
2533 if (local->mad_priv) {
2534 u8 base_version;
2535 recv_mad_agent = local->recv_mad_agent;
2536 if (!recv_mad_agent) {
2537 dev_err(&mad_agent_priv->agent.device->dev,
2538 "No receive MAD agent for local completion\n");
2539 free_mad = 1;
2540 goto local_send_completion;
2541 }
2542
2543 /*
2544 * Defined behavior is to complete response
2545 * before request
2546 */
2547 build_smp_wc(recv_mad_agent->agent.qp,
2548 local->mad_send_wr->send_wr.wr.wr_cqe,
2549 be16_to_cpu(IB_LID_PERMISSIVE),
2550 local->mad_send_wr->send_wr.pkey_index,
2551 recv_mad_agent->agent.port_num, &wc);
2552
2553 local->mad_priv->header.recv_wc.wc = &wc;
2554
2555 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2556 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2557 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2558 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2559 } else {
2560 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2561 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2562 }
2563
2564 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2565 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2566 &local->mad_priv->header.recv_wc.rmpp_list);
2567 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2568 local->mad_priv->header.recv_wc.recv_buf.mad =
2569 (struct ib_mad *)local->mad_priv->mad;
2570 recv_mad_agent->agent.recv_handler(
2571 &recv_mad_agent->agent,
2572 &local->mad_send_wr->send_buf,
2573 &local->mad_priv->header.recv_wc);
2574 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2575 deref_mad_agent(recv_mad_agent);
2576 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2577 }
2578
2579local_send_completion:
2580 /* Complete send */
2581 mad_send_wc.status = IB_WC_SUCCESS;
2582 mad_send_wc.vendor_err = 0;
2583 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2584 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2585 &mad_send_wc);
2586
2587 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2588 deref_mad_agent(mad_agent_priv);
2589 if (free_mad)
2590 kfree(local->mad_priv);
2591 kfree(local);
2592 }
2593 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2594}
2595
2596static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2597{
2598 int ret;
2599
2600 if (!mad_send_wr->retries_left)
2601 return -ETIMEDOUT;
2602
2603 mad_send_wr->retries_left--;
2604 mad_send_wr->send_buf.retries++;
2605
2606 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2607
2608 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2609 ret = ib_retry_rmpp(mad_send_wr);
2610 switch (ret) {
2611 case IB_RMPP_RESULT_UNHANDLED:
2612 ret = ib_send_mad(mad_send_wr);
2613 break;
2614 case IB_RMPP_RESULT_CONSUMED:
2615 ret = 0;
2616 break;
2617 default:
2618 ret = -ECOMM;
2619 break;
2620 }
2621 } else
2622 ret = ib_send_mad(mad_send_wr);
2623
2624 if (!ret) {
2625 mad_send_wr->refcount++;
2626 list_add_tail(&mad_send_wr->agent_list,
2627 &mad_send_wr->mad_agent_priv->send_list);
2628 }
2629 return ret;
2630}
2631
2632static void timeout_sends(struct work_struct *work)
2633{
2634 struct ib_mad_agent_private *mad_agent_priv;
2635 struct ib_mad_send_wr_private *mad_send_wr;
2636 struct ib_mad_send_wc mad_send_wc;
2637 unsigned long flags, delay;
2638
2639 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2640 timed_work.work);
2641 mad_send_wc.vendor_err = 0;
2642
2643 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2644 while (!list_empty(&mad_agent_priv->wait_list)) {
2645 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2646 struct ib_mad_send_wr_private,
2647 agent_list);
2648
2649 if (time_after(mad_send_wr->timeout, jiffies)) {
2650 delay = mad_send_wr->timeout - jiffies;
2651 if ((long)delay <= 0)
2652 delay = 1;
2653 queue_delayed_work(mad_agent_priv->qp_info->
2654 port_priv->wq,
2655 &mad_agent_priv->timed_work, delay);
2656 break;
2657 }
2658
2659 list_del(&mad_send_wr->agent_list);
2660 if (mad_send_wr->status == IB_WC_SUCCESS &&
2661 !retry_send(mad_send_wr))
2662 continue;
2663
2664 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2665
2666 if (mad_send_wr->status == IB_WC_SUCCESS)
2667 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2668 else
2669 mad_send_wc.status = mad_send_wr->status;
2670 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2671 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2672 &mad_send_wc);
2673
2674 deref_mad_agent(mad_agent_priv);
2675 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2676 }
2677 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2678}
2679
2680/*
2681 * Allocate receive MADs and post receive WRs for them
2682 */
2683static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2684 struct ib_mad_private *mad)
2685{
2686 unsigned long flags;
2687 int post, ret;
2688 struct ib_mad_private *mad_priv;
2689 struct ib_sge sg_list;
2690 struct ib_recv_wr recv_wr;
2691 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2692
2693 /* Initialize common scatter list fields */
2694 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2695
2696 /* Initialize common receive WR fields */
2697 recv_wr.next = NULL;
2698 recv_wr.sg_list = &sg_list;
2699 recv_wr.num_sge = 1;
2700
2701 do {
2702 /* Allocate and map receive buffer */
2703 if (mad) {
2704 mad_priv = mad;
2705 mad = NULL;
2706 } else {
2707 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2708 GFP_ATOMIC);
2709 if (!mad_priv) {
2710 ret = -ENOMEM;
2711 break;
2712 }
2713 }
2714 sg_list.length = mad_priv_dma_size(mad_priv);
2715 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2716 &mad_priv->grh,
2717 mad_priv_dma_size(mad_priv),
2718 DMA_FROM_DEVICE);
2719 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2720 sg_list.addr))) {
2721 kfree(mad_priv);
2722 ret = -ENOMEM;
2723 break;
2724 }
2725 mad_priv->header.mapping = sg_list.addr;
2726 mad_priv->header.mad_list.mad_queue = recv_queue;
2727 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2728 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2729
2730 /* Post receive WR */
2731 spin_lock_irqsave(&recv_queue->lock, flags);
2732 post = (++recv_queue->count < recv_queue->max_active);
2733 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2734 spin_unlock_irqrestore(&recv_queue->lock, flags);
2735 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
2736 if (ret) {
2737 spin_lock_irqsave(&recv_queue->lock, flags);
2738 list_del(&mad_priv->header.mad_list.list);
2739 recv_queue->count--;
2740 spin_unlock_irqrestore(&recv_queue->lock, flags);
2741 ib_dma_unmap_single(qp_info->port_priv->device,
2742 mad_priv->header.mapping,
2743 mad_priv_dma_size(mad_priv),
2744 DMA_FROM_DEVICE);
2745 kfree(mad_priv);
2746 dev_err(&qp_info->port_priv->device->dev,
2747 "ib_post_recv failed: %d\n", ret);
2748 break;
2749 }
2750 } while (post);
2751
2752 return ret;
2753}
2754
2755/*
2756 * Return all the posted receive MADs
2757 */
2758static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2759{
2760 struct ib_mad_private_header *mad_priv_hdr;
2761 struct ib_mad_private *recv;
2762 struct ib_mad_list_head *mad_list;
2763
2764 if (!qp_info->qp)
2765 return;
2766
2767 while (!list_empty(&qp_info->recv_queue.list)) {
2768
2769 mad_list = list_entry(qp_info->recv_queue.list.next,
2770 struct ib_mad_list_head, list);
2771 mad_priv_hdr = container_of(mad_list,
2772 struct ib_mad_private_header,
2773 mad_list);
2774 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2775 header);
2776
2777 /* Remove from posted receive MAD list */
2778 list_del(&mad_list->list);
2779
2780 ib_dma_unmap_single(qp_info->port_priv->device,
2781 recv->header.mapping,
2782 mad_priv_dma_size(recv),
2783 DMA_FROM_DEVICE);
2784 kfree(recv);
2785 }
2786
2787 qp_info->recv_queue.count = 0;
2788}
2789
2790/*
2791 * Start the port
2792 */
2793static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2794{
2795 int ret, i;
2796 struct ib_qp_attr *attr;
2797 struct ib_qp *qp;
2798 u16 pkey_index;
2799
2800 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2801 if (!attr)
2802 return -ENOMEM;
2803
2804 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2805 IB_DEFAULT_PKEY_FULL, &pkey_index);
2806 if (ret)
2807 pkey_index = 0;
2808
2809 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2810 qp = port_priv->qp_info[i].qp;
2811 if (!qp)
2812 continue;
2813
2814 /*
2815 * PKey index for QP1 is irrelevant but
2816 * one is needed for the Reset to Init transition
2817 */
2818 attr->qp_state = IB_QPS_INIT;
2819 attr->pkey_index = pkey_index;
2820 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2821 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2822 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2823 if (ret) {
2824 dev_err(&port_priv->device->dev,
2825 "Couldn't change QP%d state to INIT: %d\n",
2826 i, ret);
2827 goto out;
2828 }
2829
2830 attr->qp_state = IB_QPS_RTR;
2831 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2832 if (ret) {
2833 dev_err(&port_priv->device->dev,
2834 "Couldn't change QP%d state to RTR: %d\n",
2835 i, ret);
2836 goto out;
2837 }
2838
2839 attr->qp_state = IB_QPS_RTS;
2840 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2841 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2842 if (ret) {
2843 dev_err(&port_priv->device->dev,
2844 "Couldn't change QP%d state to RTS: %d\n",
2845 i, ret);
2846 goto out;
2847 }
2848 }
2849
2850 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2851 if (ret) {
2852 dev_err(&port_priv->device->dev,
2853 "Failed to request completion notification: %d\n",
2854 ret);
2855 goto out;
2856 }
2857
2858 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2859 if (!port_priv->qp_info[i].qp)
2860 continue;
2861
2862 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2863 if (ret) {
2864 dev_err(&port_priv->device->dev,
2865 "Couldn't post receive WRs\n");
2866 goto out;
2867 }
2868 }
2869out:
2870 kfree(attr);
2871 return ret;
2872}
2873
2874static void qp_event_handler(struct ib_event *event, void *qp_context)
2875{
2876 struct ib_mad_qp_info *qp_info = qp_context;
2877
2878 /* It's worse than that! He's dead, Jim! */
2879 dev_err(&qp_info->port_priv->device->dev,
2880 "Fatal error (%d) on MAD QP (%d)\n",
2881 event->event, qp_info->qp->qp_num);
2882}
2883
2884static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2885 struct ib_mad_queue *mad_queue)
2886{
2887 mad_queue->qp_info = qp_info;
2888 mad_queue->count = 0;
2889 spin_lock_init(&mad_queue->lock);
2890 INIT_LIST_HEAD(&mad_queue->list);
2891}
2892
2893static void init_mad_qp(struct ib_mad_port_private *port_priv,
2894 struct ib_mad_qp_info *qp_info)
2895{
2896 qp_info->port_priv = port_priv;
2897 init_mad_queue(qp_info, &qp_info->send_queue);
2898 init_mad_queue(qp_info, &qp_info->recv_queue);
2899 INIT_LIST_HEAD(&qp_info->overflow_list);
2900}
2901
2902static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2903 enum ib_qp_type qp_type)
2904{
2905 struct ib_qp_init_attr qp_init_attr;
2906 int ret;
2907
2908 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2909 qp_init_attr.send_cq = qp_info->port_priv->cq;
2910 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2911 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2912 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2913 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2914 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2915 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2916 qp_init_attr.qp_type = qp_type;
2917 qp_init_attr.port_num = qp_info->port_priv->port_num;
2918 qp_init_attr.qp_context = qp_info;
2919 qp_init_attr.event_handler = qp_event_handler;
2920 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2921 if (IS_ERR(qp_info->qp)) {
2922 dev_err(&qp_info->port_priv->device->dev,
2923 "Couldn't create ib_mad QP%d\n",
2924 get_spl_qp_index(qp_type));
2925 ret = PTR_ERR(qp_info->qp);
2926 goto error;
2927 }
2928 /* Use minimum queue sizes unless the CQ is resized */
2929 qp_info->send_queue.max_active = mad_sendq_size;
2930 qp_info->recv_queue.max_active = mad_recvq_size;
2931 return 0;
2932
2933error:
2934 return ret;
2935}
2936
2937static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2938{
2939 if (!qp_info->qp)
2940 return;
2941
2942 ib_destroy_qp(qp_info->qp);
2943}
2944
2945/*
2946 * Open the port
2947 * Create the QP, PD, MR, and CQ if needed
2948 */
2949static int ib_mad_port_open(struct ib_device *device,
2950 int port_num)
2951{
2952 int ret, cq_size;
2953 struct ib_mad_port_private *port_priv;
2954 unsigned long flags;
2955 char name[sizeof "ib_mad123"];
2956 int has_smi;
2957
2958 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
2959 return -EFAULT;
2960
2961 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
2962 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
2963 return -EFAULT;
2964
2965 /* Create new device info */
2966 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2967 if (!port_priv)
2968 return -ENOMEM;
2969
2970 port_priv->device = device;
2971 port_priv->port_num = port_num;
2972 spin_lock_init(&port_priv->reg_lock);
2973 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2974 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2975
2976 cq_size = mad_sendq_size + mad_recvq_size;
2977 has_smi = rdma_cap_ib_smi(device, port_num);
2978 if (has_smi)
2979 cq_size *= 2;
2980
2981 port_priv->pd = ib_alloc_pd(device, 0);
2982 if (IS_ERR(port_priv->pd)) {
2983 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2984 ret = PTR_ERR(port_priv->pd);
2985 goto error3;
2986 }
2987
2988 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
2989 IB_POLL_UNBOUND_WORKQUEUE);
2990 if (IS_ERR(port_priv->cq)) {
2991 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2992 ret = PTR_ERR(port_priv->cq);
2993 goto error4;
2994 }
2995
2996 if (has_smi) {
2997 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2998 if (ret)
2999 goto error6;
3000 }
3001 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3002 if (ret)
3003 goto error7;
3004
3005 snprintf(name, sizeof name, "ib_mad%d", port_num);
3006 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3007 if (!port_priv->wq) {
3008 ret = -ENOMEM;
3009 goto error8;
3010 }
3011
3012 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3013 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3014 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3015
3016 ret = ib_mad_port_start(port_priv);
3017 if (ret) {
3018 dev_err(&device->dev, "Couldn't start port\n");
3019 goto error9;
3020 }
3021
3022 return 0;
3023
3024error9:
3025 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3026 list_del_init(&port_priv->port_list);
3027 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3028
3029 destroy_workqueue(port_priv->wq);
3030error8:
3031 destroy_mad_qp(&port_priv->qp_info[1]);
3032error7:
3033 destroy_mad_qp(&port_priv->qp_info[0]);
3034error6:
3035 ib_free_cq(port_priv->cq);
3036 cleanup_recv_queue(&port_priv->qp_info[1]);
3037 cleanup_recv_queue(&port_priv->qp_info[0]);
3038error4:
3039 ib_dealloc_pd(port_priv->pd);
3040error3:
3041 kfree(port_priv);
3042
3043 return ret;
3044}
3045
3046/*
3047 * Close the port
3048 * If there are no classes using the port, free the port
3049 * resources (CQ, MR, PD, QP) and remove the port's info structure
3050 */
3051static int ib_mad_port_close(struct ib_device *device, int port_num)
3052{
3053 struct ib_mad_port_private *port_priv;
3054 unsigned long flags;
3055
3056 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3057 port_priv = __ib_get_mad_port(device, port_num);
3058 if (port_priv == NULL) {
3059 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3060 dev_err(&device->dev, "Port %d not found\n", port_num);
3061 return -ENODEV;
3062 }
3063 list_del_init(&port_priv->port_list);
3064 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3065
3066 destroy_workqueue(port_priv->wq);
3067 destroy_mad_qp(&port_priv->qp_info[1]);
3068 destroy_mad_qp(&port_priv->qp_info[0]);
3069 ib_free_cq(port_priv->cq);
3070 ib_dealloc_pd(port_priv->pd);
3071 cleanup_recv_queue(&port_priv->qp_info[1]);
3072 cleanup_recv_queue(&port_priv->qp_info[0]);
3073 /* XXX: Handle deallocation of MAD registration tables */
3074
3075 kfree(port_priv);
3076
3077 return 0;
3078}
3079
3080static int ib_mad_init_device(struct ib_device *device)
3081{
3082 int start, i;
3083 unsigned int count = 0;
3084 int ret;
3085
3086 start = rdma_start_port(device);
3087
3088 for (i = start; i <= rdma_end_port(device); i++) {
3089 if (!rdma_cap_ib_mad(device, i))
3090 continue;
3091
3092 ret = ib_mad_port_open(device, i);
3093 if (ret) {
3094 dev_err(&device->dev, "Couldn't open port %d\n", i);
3095 goto error;
3096 }
3097 ret = ib_agent_port_open(device, i);
3098 if (ret) {
3099 dev_err(&device->dev,
3100 "Couldn't open port %d for agents\n", i);
3101 goto error_agent;
3102 }
3103 count++;
3104 }
3105 if (!count)
3106 return -EOPNOTSUPP;
3107
3108 return 0;
3109
3110error_agent:
3111 if (ib_mad_port_close(device, i))
3112 dev_err(&device->dev, "Couldn't close port %d\n", i);
3113
3114error:
3115 while (--i >= start) {
3116 if (!rdma_cap_ib_mad(device, i))
3117 continue;
3118
3119 if (ib_agent_port_close(device, i))
3120 dev_err(&device->dev,
3121 "Couldn't close port %d for agents\n", i);
3122 if (ib_mad_port_close(device, i))
3123 dev_err(&device->dev, "Couldn't close port %d\n", i);
3124 }
3125 return ret;
3126}
3127
3128static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3129{
3130 unsigned int i;
3131
3132 rdma_for_each_port (device, i) {
3133 if (!rdma_cap_ib_mad(device, i))
3134 continue;
3135
3136 if (ib_agent_port_close(device, i))
3137 dev_err(&device->dev,
3138 "Couldn't close port %d for agents\n", i);
3139 if (ib_mad_port_close(device, i))
3140 dev_err(&device->dev, "Couldn't close port %d\n", i);
3141 }
3142}
3143
3144static struct ib_client mad_client = {
3145 .name = "mad",
3146 .add = ib_mad_init_device,
3147 .remove = ib_mad_remove_device
3148};
3149
3150int ib_mad_init(void)
3151{
3152 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3153 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3154
3155 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3156 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3157
3158 INIT_LIST_HEAD(&ib_mad_port_list);
3159
3160 if (ib_register_client(&mad_client)) {
3161 pr_err("Couldn't register ib_mad client\n");
3162 return -EINVAL;
3163 }
3164
3165 return 0;
3166}
3167
3168void ib_mad_cleanup(void)
3169{
3170 ib_unregister_client(&mad_client);
3171}