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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 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 <rdma/ib_cache.h>
45
46#include "mad_priv.h"
47#include "core_priv.h"
48#include "mad_rmpp.h"
49#include "smi.h"
50#include "opa_smi.h"
51#include "agent.h"
52
53static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
54static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
55
56module_param_named(send_queue_size, mad_sendq_size, int, 0444);
57MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
58module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
59MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
60
61static struct list_head ib_mad_port_list;
62static atomic_t ib_mad_client_id = ATOMIC_INIT(0);
63
64/* Port list lock */
65static DEFINE_SPINLOCK(ib_mad_port_list_lock);
66
67/* Forward declarations */
68static int method_in_use(struct ib_mad_mgmt_method_table **method,
69 struct ib_mad_reg_req *mad_reg_req);
70static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
71static struct ib_mad_agent_private *find_mad_agent(
72 struct ib_mad_port_private *port_priv,
73 const struct ib_mad_hdr *mad);
74static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
75 struct ib_mad_private *mad);
76static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
77static void timeout_sends(struct work_struct *work);
78static void local_completions(struct work_struct *work);
79static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
80 struct ib_mad_agent_private *agent_priv,
81 u8 mgmt_class);
82static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv);
84static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
85 struct ib_wc *wc);
86static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
87
88/*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92static inline struct ib_mad_port_private *
93__ib_get_mad_port(struct ib_device *device, int port_num)
94{
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102}
103
104/*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108static inline struct ib_mad_port_private *
109ib_get_mad_port(struct ib_device *device, int port_num)
110{
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119}
120
121static inline u8 convert_mgmt_class(u8 mgmt_class)
122{
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126}
127
128static int get_spl_qp_index(enum ib_qp_type qp_type)
129{
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139}
140
141static int vendor_class_index(u8 mgmt_class)
142{
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144}
145
146static int is_vendor_class(u8 mgmt_class)
147{
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152}
153
154static int is_vendor_oui(char *oui)
155{
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159}
160
161static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164{
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180}
181
182int ib_response_mad(const struct ib_mad_hdr *hdr)
183{
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188}
189EXPORT_SYMBOL(ib_response_mad);
190
191/*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
194struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203{
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev,
321 "ib_register_mad_agent: Invalid port %d\n",
322 port_num);
323 ret = ERR_PTR(-ENODEV);
324 goto error1;
325 }
326
327 /* Verify the QP requested is supported. For example, Ethernet devices
328 * will not have QP0 */
329 if (!port_priv->qp_info[qpn].qp) {
330 dev_notice(&device->dev,
331 "ib_register_mad_agent: QP %d not supported\n", qpn);
332 ret = ERR_PTR(-EPROTONOSUPPORT);
333 goto error1;
334 }
335
336 /* Allocate structures */
337 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
338 if (!mad_agent_priv) {
339 ret = ERR_PTR(-ENOMEM);
340 goto error1;
341 }
342
343 if (mad_reg_req) {
344 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
345 if (!reg_req) {
346 ret = ERR_PTR(-ENOMEM);
347 goto error3;
348 }
349 }
350
351 /* Now, fill in the various structures */
352 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
353 mad_agent_priv->reg_req = reg_req;
354 mad_agent_priv->agent.rmpp_version = rmpp_version;
355 mad_agent_priv->agent.device = device;
356 mad_agent_priv->agent.recv_handler = recv_handler;
357 mad_agent_priv->agent.send_handler = send_handler;
358 mad_agent_priv->agent.context = context;
359 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
360 mad_agent_priv->agent.port_num = port_num;
361 mad_agent_priv->agent.flags = registration_flags;
362 spin_lock_init(&mad_agent_priv->lock);
363 INIT_LIST_HEAD(&mad_agent_priv->send_list);
364 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
365 INIT_LIST_HEAD(&mad_agent_priv->done_list);
366 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
367 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
368 INIT_LIST_HEAD(&mad_agent_priv->local_list);
369 INIT_WORK(&mad_agent_priv->local_work, local_completions);
370 atomic_set(&mad_agent_priv->refcount, 1);
371 init_completion(&mad_agent_priv->comp);
372
373 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
374 if (ret2) {
375 ret = ERR_PTR(ret2);
376 goto error4;
377 }
378
379 spin_lock_irqsave(&port_priv->reg_lock, flags);
380 mad_agent_priv->agent.hi_tid = atomic_inc_return(&ib_mad_client_id);
381
382 /*
383 * Make sure MAD registration (if supplied)
384 * is non overlapping with any existing ones
385 */
386 if (mad_reg_req) {
387 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
388 if (!is_vendor_class(mgmt_class)) {
389 class = port_priv->version[mad_reg_req->
390 mgmt_class_version].class;
391 if (class) {
392 method = class->method_table[mgmt_class];
393 if (method) {
394 if (method_in_use(&method,
395 mad_reg_req))
396 goto error5;
397 }
398 }
399 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
400 mgmt_class);
401 } else {
402 /* "New" vendor class range */
403 vendor = port_priv->version[mad_reg_req->
404 mgmt_class_version].vendor;
405 if (vendor) {
406 vclass = vendor_class_index(mgmt_class);
407 vendor_class = vendor->vendor_class[vclass];
408 if (vendor_class) {
409 if (is_vendor_method_in_use(
410 vendor_class,
411 mad_reg_req))
412 goto error5;
413 }
414 }
415 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
416 }
417 if (ret2) {
418 ret = ERR_PTR(ret2);
419 goto error5;
420 }
421 }
422
423 /* Add mad agent into port's agent list */
424 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
425 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
426
427 return &mad_agent_priv->agent;
428error5:
429 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
430 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
431error4:
432 kfree(reg_req);
433error3:
434 kfree(mad_agent_priv);
435error1:
436 return ret;
437}
438EXPORT_SYMBOL(ib_register_mad_agent);
439
440static inline int is_snooping_sends(int mad_snoop_flags)
441{
442 return (mad_snoop_flags &
443 (/*IB_MAD_SNOOP_POSTED_SENDS |
444 IB_MAD_SNOOP_RMPP_SENDS |*/
445 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
446 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
447}
448
449static inline int is_snooping_recvs(int mad_snoop_flags)
450{
451 return (mad_snoop_flags &
452 (IB_MAD_SNOOP_RECVS /*|
453 IB_MAD_SNOOP_RMPP_RECVS*/));
454}
455
456static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
457 struct ib_mad_snoop_private *mad_snoop_priv)
458{
459 struct ib_mad_snoop_private **new_snoop_table;
460 unsigned long flags;
461 int i;
462
463 spin_lock_irqsave(&qp_info->snoop_lock, flags);
464 /* Check for empty slot in array. */
465 for (i = 0; i < qp_info->snoop_table_size; i++)
466 if (!qp_info->snoop_table[i])
467 break;
468
469 if (i == qp_info->snoop_table_size) {
470 /* Grow table. */
471 new_snoop_table = krealloc(qp_info->snoop_table,
472 sizeof mad_snoop_priv *
473 (qp_info->snoop_table_size + 1),
474 GFP_ATOMIC);
475 if (!new_snoop_table) {
476 i = -ENOMEM;
477 goto out;
478 }
479
480 qp_info->snoop_table = new_snoop_table;
481 qp_info->snoop_table_size++;
482 }
483 qp_info->snoop_table[i] = mad_snoop_priv;
484 atomic_inc(&qp_info->snoop_count);
485out:
486 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
487 return i;
488}
489
490struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
491 u8 port_num,
492 enum ib_qp_type qp_type,
493 int mad_snoop_flags,
494 ib_mad_snoop_handler snoop_handler,
495 ib_mad_recv_handler recv_handler,
496 void *context)
497{
498 struct ib_mad_port_private *port_priv;
499 struct ib_mad_agent *ret;
500 struct ib_mad_snoop_private *mad_snoop_priv;
501 int qpn;
502 int err;
503
504 /* Validate parameters */
505 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
506 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
507 ret = ERR_PTR(-EINVAL);
508 goto error1;
509 }
510 qpn = get_spl_qp_index(qp_type);
511 if (qpn == -1) {
512 ret = ERR_PTR(-EINVAL);
513 goto error1;
514 }
515 port_priv = ib_get_mad_port(device, port_num);
516 if (!port_priv) {
517 ret = ERR_PTR(-ENODEV);
518 goto error1;
519 }
520 /* Allocate structures */
521 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
522 if (!mad_snoop_priv) {
523 ret = ERR_PTR(-ENOMEM);
524 goto error1;
525 }
526
527 /* Now, fill in the various structures */
528 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
529 mad_snoop_priv->agent.device = device;
530 mad_snoop_priv->agent.recv_handler = recv_handler;
531 mad_snoop_priv->agent.snoop_handler = snoop_handler;
532 mad_snoop_priv->agent.context = context;
533 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
534 mad_snoop_priv->agent.port_num = port_num;
535 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
536 init_completion(&mad_snoop_priv->comp);
537
538 err = ib_mad_agent_security_setup(&mad_snoop_priv->agent, qp_type);
539 if (err) {
540 ret = ERR_PTR(err);
541 goto error2;
542 }
543
544 mad_snoop_priv->snoop_index = register_snoop_agent(
545 &port_priv->qp_info[qpn],
546 mad_snoop_priv);
547 if (mad_snoop_priv->snoop_index < 0) {
548 ret = ERR_PTR(mad_snoop_priv->snoop_index);
549 goto error3;
550 }
551
552 atomic_set(&mad_snoop_priv->refcount, 1);
553 return &mad_snoop_priv->agent;
554error3:
555 ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
556error2:
557 kfree(mad_snoop_priv);
558error1:
559 return ret;
560}
561EXPORT_SYMBOL(ib_register_mad_snoop);
562
563static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
564{
565 if (atomic_dec_and_test(&mad_agent_priv->refcount))
566 complete(&mad_agent_priv->comp);
567}
568
569static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
570{
571 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
572 complete(&mad_snoop_priv->comp);
573}
574
575static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
576{
577 struct ib_mad_port_private *port_priv;
578 unsigned long flags;
579
580 /* Note that we could still be handling received MADs */
581
582 /*
583 * Canceling all sends results in dropping received response
584 * MADs, preventing us from queuing additional work
585 */
586 cancel_mads(mad_agent_priv);
587 port_priv = mad_agent_priv->qp_info->port_priv;
588 cancel_delayed_work(&mad_agent_priv->timed_work);
589
590 spin_lock_irqsave(&port_priv->reg_lock, flags);
591 remove_mad_reg_req(mad_agent_priv);
592 list_del(&mad_agent_priv->agent_list);
593 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
594
595 flush_workqueue(port_priv->wq);
596 ib_cancel_rmpp_recvs(mad_agent_priv);
597
598 deref_mad_agent(mad_agent_priv);
599 wait_for_completion(&mad_agent_priv->comp);
600
601 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
602
603 kfree(mad_agent_priv->reg_req);
604 kfree(mad_agent_priv);
605}
606
607static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
608{
609 struct ib_mad_qp_info *qp_info;
610 unsigned long flags;
611
612 qp_info = mad_snoop_priv->qp_info;
613 spin_lock_irqsave(&qp_info->snoop_lock, flags);
614 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
615 atomic_dec(&qp_info->snoop_count);
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617
618 deref_snoop_agent(mad_snoop_priv);
619 wait_for_completion(&mad_snoop_priv->comp);
620
621 ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
622
623 kfree(mad_snoop_priv);
624}
625
626/*
627 * ib_unregister_mad_agent - Unregisters a client from using MAD services
628 */
629void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
630{
631 struct ib_mad_agent_private *mad_agent_priv;
632 struct ib_mad_snoop_private *mad_snoop_priv;
633
634 /* If the TID is zero, the agent can only snoop. */
635 if (mad_agent->hi_tid) {
636 mad_agent_priv = container_of(mad_agent,
637 struct ib_mad_agent_private,
638 agent);
639 unregister_mad_agent(mad_agent_priv);
640 } else {
641 mad_snoop_priv = container_of(mad_agent,
642 struct ib_mad_snoop_private,
643 agent);
644 unregister_mad_snoop(mad_snoop_priv);
645 }
646}
647EXPORT_SYMBOL(ib_unregister_mad_agent);
648
649static void dequeue_mad(struct ib_mad_list_head *mad_list)
650{
651 struct ib_mad_queue *mad_queue;
652 unsigned long flags;
653
654 BUG_ON(!mad_list->mad_queue);
655 mad_queue = mad_list->mad_queue;
656 spin_lock_irqsave(&mad_queue->lock, flags);
657 list_del(&mad_list->list);
658 mad_queue->count--;
659 spin_unlock_irqrestore(&mad_queue->lock, flags);
660}
661
662static void snoop_send(struct ib_mad_qp_info *qp_info,
663 struct ib_mad_send_buf *send_buf,
664 struct ib_mad_send_wc *mad_send_wc,
665 int mad_snoop_flags)
666{
667 struct ib_mad_snoop_private *mad_snoop_priv;
668 unsigned long flags;
669 int i;
670
671 spin_lock_irqsave(&qp_info->snoop_lock, flags);
672 for (i = 0; i < qp_info->snoop_table_size; i++) {
673 mad_snoop_priv = qp_info->snoop_table[i];
674 if (!mad_snoop_priv ||
675 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
676 continue;
677
678 atomic_inc(&mad_snoop_priv->refcount);
679 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
680 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
681 send_buf, mad_send_wc);
682 deref_snoop_agent(mad_snoop_priv);
683 spin_lock_irqsave(&qp_info->snoop_lock, flags);
684 }
685 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
686}
687
688static void snoop_recv(struct ib_mad_qp_info *qp_info,
689 struct ib_mad_recv_wc *mad_recv_wc,
690 int mad_snoop_flags)
691{
692 struct ib_mad_snoop_private *mad_snoop_priv;
693 unsigned long flags;
694 int i;
695
696 spin_lock_irqsave(&qp_info->snoop_lock, flags);
697 for (i = 0; i < qp_info->snoop_table_size; i++) {
698 mad_snoop_priv = qp_info->snoop_table[i];
699 if (!mad_snoop_priv ||
700 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
701 continue;
702
703 atomic_inc(&mad_snoop_priv->refcount);
704 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
705 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
706 mad_recv_wc);
707 deref_snoop_agent(mad_snoop_priv);
708 spin_lock_irqsave(&qp_info->snoop_lock, flags);
709 }
710 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
711}
712
713static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
714 u16 pkey_index, u8 port_num, struct ib_wc *wc)
715{
716 memset(wc, 0, sizeof *wc);
717 wc->wr_cqe = cqe;
718 wc->status = IB_WC_SUCCESS;
719 wc->opcode = IB_WC_RECV;
720 wc->pkey_index = pkey_index;
721 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
722 wc->src_qp = IB_QP0;
723 wc->qp = qp;
724 wc->slid = slid;
725 wc->sl = 0;
726 wc->dlid_path_bits = 0;
727 wc->port_num = port_num;
728}
729
730static size_t mad_priv_size(const struct ib_mad_private *mp)
731{
732 return sizeof(struct ib_mad_private) + mp->mad_size;
733}
734
735static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
736{
737 size_t size = sizeof(struct ib_mad_private) + mad_size;
738 struct ib_mad_private *ret = kzalloc(size, flags);
739
740 if (ret)
741 ret->mad_size = mad_size;
742
743 return ret;
744}
745
746static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
747{
748 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
749}
750
751static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
752{
753 return sizeof(struct ib_grh) + mp->mad_size;
754}
755
756/*
757 * Return 0 if SMP is to be sent
758 * Return 1 if SMP was consumed locally (whether or not solicited)
759 * Return < 0 if error
760 */
761static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
762 struct ib_mad_send_wr_private *mad_send_wr)
763{
764 int ret = 0;
765 struct ib_smp *smp = mad_send_wr->send_buf.mad;
766 struct opa_smp *opa_smp = (struct opa_smp *)smp;
767 unsigned long flags;
768 struct ib_mad_local_private *local;
769 struct ib_mad_private *mad_priv;
770 struct ib_mad_port_private *port_priv;
771 struct ib_mad_agent_private *recv_mad_agent = NULL;
772 struct ib_device *device = mad_agent_priv->agent.device;
773 u8 port_num;
774 struct ib_wc mad_wc;
775 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
776 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
777 u16 out_mad_pkey_index = 0;
778 u16 drslid;
779 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
780 mad_agent_priv->qp_info->port_priv->port_num);
781
782 if (rdma_cap_ib_switch(device) &&
783 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
784 port_num = send_wr->port_num;
785 else
786 port_num = mad_agent_priv->agent.port_num;
787
788 /*
789 * Directed route handling starts if the initial LID routed part of
790 * a request or the ending LID routed part of a response is empty.
791 * If we are at the start of the LID routed part, don't update the
792 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
793 */
794 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
795 u32 opa_drslid;
796
797 if ((opa_get_smp_direction(opa_smp)
798 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
799 OPA_LID_PERMISSIVE &&
800 opa_smi_handle_dr_smp_send(opa_smp,
801 rdma_cap_ib_switch(device),
802 port_num) == IB_SMI_DISCARD) {
803 ret = -EINVAL;
804 dev_err(&device->dev, "OPA Invalid directed route\n");
805 goto out;
806 }
807 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
808 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
809 opa_drslid & 0xffff0000) {
810 ret = -EINVAL;
811 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
812 opa_drslid);
813 goto out;
814 }
815 drslid = (u16)(opa_drslid & 0x0000ffff);
816
817 /* Check to post send on QP or process locally */
818 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
819 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
820 goto out;
821 } else {
822 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
823 IB_LID_PERMISSIVE &&
824 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
825 IB_SMI_DISCARD) {
826 ret = -EINVAL;
827 dev_err(&device->dev, "Invalid directed route\n");
828 goto out;
829 }
830 drslid = be16_to_cpu(smp->dr_slid);
831
832 /* Check to post send on QP or process locally */
833 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
834 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
835 goto out;
836 }
837
838 local = kmalloc(sizeof *local, GFP_ATOMIC);
839 if (!local) {
840 ret = -ENOMEM;
841 goto out;
842 }
843 local->mad_priv = NULL;
844 local->recv_mad_agent = NULL;
845 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
846 if (!mad_priv) {
847 ret = -ENOMEM;
848 kfree(local);
849 goto out;
850 }
851
852 build_smp_wc(mad_agent_priv->agent.qp,
853 send_wr->wr.wr_cqe, drslid,
854 send_wr->pkey_index,
855 send_wr->port_num, &mad_wc);
856
857 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
858 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
859 + mad_send_wr->send_buf.data_len
860 + sizeof(struct ib_grh);
861 }
862
863 /* No GRH for DR SMP */
864 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
865 (const struct ib_mad_hdr *)smp, mad_size,
866 (struct ib_mad_hdr *)mad_priv->mad,
867 &mad_size, &out_mad_pkey_index);
868 switch (ret)
869 {
870 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
871 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
872 mad_agent_priv->agent.recv_handler) {
873 local->mad_priv = mad_priv;
874 local->recv_mad_agent = mad_agent_priv;
875 /*
876 * Reference MAD agent until receive
877 * side of local completion handled
878 */
879 atomic_inc(&mad_agent_priv->refcount);
880 } else
881 kfree(mad_priv);
882 break;
883 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
884 kfree(mad_priv);
885 break;
886 case IB_MAD_RESULT_SUCCESS:
887 /* Treat like an incoming receive MAD */
888 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
889 mad_agent_priv->agent.port_num);
890 if (port_priv) {
891 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
892 recv_mad_agent = find_mad_agent(port_priv,
893 (const struct ib_mad_hdr *)mad_priv->mad);
894 }
895 if (!port_priv || !recv_mad_agent) {
896 /*
897 * No receiving agent so drop packet and
898 * generate send completion.
899 */
900 kfree(mad_priv);
901 break;
902 }
903 local->mad_priv = mad_priv;
904 local->recv_mad_agent = recv_mad_agent;
905 break;
906 default:
907 kfree(mad_priv);
908 kfree(local);
909 ret = -EINVAL;
910 goto out;
911 }
912
913 local->mad_send_wr = mad_send_wr;
914 if (opa) {
915 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
916 local->return_wc_byte_len = mad_size;
917 }
918 /* Reference MAD agent until send side of local completion handled */
919 atomic_inc(&mad_agent_priv->refcount);
920 /* Queue local completion to local list */
921 spin_lock_irqsave(&mad_agent_priv->lock, flags);
922 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
923 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
924 queue_work(mad_agent_priv->qp_info->port_priv->wq,
925 &mad_agent_priv->local_work);
926 ret = 1;
927out:
928 return ret;
929}
930
931static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
932{
933 int seg_size, pad;
934
935 seg_size = mad_size - hdr_len;
936 if (data_len && seg_size) {
937 pad = seg_size - data_len % seg_size;
938 return pad == seg_size ? 0 : pad;
939 } else
940 return seg_size;
941}
942
943static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
944{
945 struct ib_rmpp_segment *s, *t;
946
947 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
948 list_del(&s->list);
949 kfree(s);
950 }
951}
952
953static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
954 size_t mad_size, gfp_t gfp_mask)
955{
956 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
957 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
958 struct ib_rmpp_segment *seg = NULL;
959 int left, seg_size, pad;
960
961 send_buf->seg_size = mad_size - send_buf->hdr_len;
962 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
963 seg_size = send_buf->seg_size;
964 pad = send_wr->pad;
965
966 /* Allocate data segments. */
967 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
968 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
969 if (!seg) {
970 free_send_rmpp_list(send_wr);
971 return -ENOMEM;
972 }
973 seg->num = ++send_buf->seg_count;
974 list_add_tail(&seg->list, &send_wr->rmpp_list);
975 }
976
977 /* Zero any padding */
978 if (pad)
979 memset(seg->data + seg_size - pad, 0, pad);
980
981 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
982 agent.rmpp_version;
983 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
984 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
985
986 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
987 struct ib_rmpp_segment, list);
988 send_wr->last_ack_seg = send_wr->cur_seg;
989 return 0;
990}
991
992int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
993{
994 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
995}
996EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
997
998struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
999 u32 remote_qpn, u16 pkey_index,
1000 int rmpp_active,
1001 int hdr_len, int data_len,
1002 gfp_t gfp_mask,
1003 u8 base_version)
1004{
1005 struct ib_mad_agent_private *mad_agent_priv;
1006 struct ib_mad_send_wr_private *mad_send_wr;
1007 int pad, message_size, ret, size;
1008 void *buf;
1009 size_t mad_size;
1010 bool opa;
1011
1012 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1013 agent);
1014
1015 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1016
1017 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1018 mad_size = sizeof(struct opa_mad);
1019 else
1020 mad_size = sizeof(struct ib_mad);
1021
1022 pad = get_pad_size(hdr_len, data_len, mad_size);
1023 message_size = hdr_len + data_len + pad;
1024
1025 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1026 if (!rmpp_active && message_size > mad_size)
1027 return ERR_PTR(-EINVAL);
1028 } else
1029 if (rmpp_active || message_size > mad_size)
1030 return ERR_PTR(-EINVAL);
1031
1032 size = rmpp_active ? hdr_len : mad_size;
1033 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1034 if (!buf)
1035 return ERR_PTR(-ENOMEM);
1036
1037 mad_send_wr = buf + size;
1038 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1039 mad_send_wr->send_buf.mad = buf;
1040 mad_send_wr->send_buf.hdr_len = hdr_len;
1041 mad_send_wr->send_buf.data_len = data_len;
1042 mad_send_wr->pad = pad;
1043
1044 mad_send_wr->mad_agent_priv = mad_agent_priv;
1045 mad_send_wr->sg_list[0].length = hdr_len;
1046 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1047
1048 /* OPA MADs don't have to be the full 2048 bytes */
1049 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1050 data_len < mad_size - hdr_len)
1051 mad_send_wr->sg_list[1].length = data_len;
1052 else
1053 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1054
1055 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1056
1057 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1058
1059 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1060 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1061 mad_send_wr->send_wr.wr.num_sge = 2;
1062 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1063 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1064 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1065 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1066 mad_send_wr->send_wr.pkey_index = pkey_index;
1067
1068 if (rmpp_active) {
1069 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1070 if (ret) {
1071 kfree(buf);
1072 return ERR_PTR(ret);
1073 }
1074 }
1075
1076 mad_send_wr->send_buf.mad_agent = mad_agent;
1077 atomic_inc(&mad_agent_priv->refcount);
1078 return &mad_send_wr->send_buf;
1079}
1080EXPORT_SYMBOL(ib_create_send_mad);
1081
1082int ib_get_mad_data_offset(u8 mgmt_class)
1083{
1084 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1085 return IB_MGMT_SA_HDR;
1086 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1087 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1088 (mgmt_class == IB_MGMT_CLASS_BIS))
1089 return IB_MGMT_DEVICE_HDR;
1090 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1091 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1092 return IB_MGMT_VENDOR_HDR;
1093 else
1094 return IB_MGMT_MAD_HDR;
1095}
1096EXPORT_SYMBOL(ib_get_mad_data_offset);
1097
1098int ib_is_mad_class_rmpp(u8 mgmt_class)
1099{
1100 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1101 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1102 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1103 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1104 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1105 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1106 return 1;
1107 return 0;
1108}
1109EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1110
1111void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1112{
1113 struct ib_mad_send_wr_private *mad_send_wr;
1114 struct list_head *list;
1115
1116 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1117 send_buf);
1118 list = &mad_send_wr->cur_seg->list;
1119
1120 if (mad_send_wr->cur_seg->num < seg_num) {
1121 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1122 if (mad_send_wr->cur_seg->num == seg_num)
1123 break;
1124 } else if (mad_send_wr->cur_seg->num > seg_num) {
1125 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1126 if (mad_send_wr->cur_seg->num == seg_num)
1127 break;
1128 }
1129 return mad_send_wr->cur_seg->data;
1130}
1131EXPORT_SYMBOL(ib_get_rmpp_segment);
1132
1133static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1134{
1135 if (mad_send_wr->send_buf.seg_count)
1136 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1137 mad_send_wr->seg_num);
1138 else
1139 return mad_send_wr->send_buf.mad +
1140 mad_send_wr->send_buf.hdr_len;
1141}
1142
1143void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1144{
1145 struct ib_mad_agent_private *mad_agent_priv;
1146 struct ib_mad_send_wr_private *mad_send_wr;
1147
1148 mad_agent_priv = container_of(send_buf->mad_agent,
1149 struct ib_mad_agent_private, agent);
1150 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1151 send_buf);
1152
1153 free_send_rmpp_list(mad_send_wr);
1154 kfree(send_buf->mad);
1155 deref_mad_agent(mad_agent_priv);
1156}
1157EXPORT_SYMBOL(ib_free_send_mad);
1158
1159int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1160{
1161 struct ib_mad_qp_info *qp_info;
1162 struct list_head *list;
1163 struct ib_send_wr *bad_send_wr;
1164 struct ib_mad_agent *mad_agent;
1165 struct ib_sge *sge;
1166 unsigned long flags;
1167 int ret;
1168
1169 /* Set WR ID to find mad_send_wr upon completion */
1170 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1171 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1172 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1173 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1174
1175 mad_agent = mad_send_wr->send_buf.mad_agent;
1176 sge = mad_send_wr->sg_list;
1177 sge[0].addr = ib_dma_map_single(mad_agent->device,
1178 mad_send_wr->send_buf.mad,
1179 sge[0].length,
1180 DMA_TO_DEVICE);
1181 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1182 return -ENOMEM;
1183
1184 mad_send_wr->header_mapping = sge[0].addr;
1185
1186 sge[1].addr = ib_dma_map_single(mad_agent->device,
1187 ib_get_payload(mad_send_wr),
1188 sge[1].length,
1189 DMA_TO_DEVICE);
1190 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1191 ib_dma_unmap_single(mad_agent->device,
1192 mad_send_wr->header_mapping,
1193 sge[0].length, DMA_TO_DEVICE);
1194 return -ENOMEM;
1195 }
1196 mad_send_wr->payload_mapping = sge[1].addr;
1197
1198 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1199 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1200 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1201 &bad_send_wr);
1202 list = &qp_info->send_queue.list;
1203 } else {
1204 ret = 0;
1205 list = &qp_info->overflow_list;
1206 }
1207
1208 if (!ret) {
1209 qp_info->send_queue.count++;
1210 list_add_tail(&mad_send_wr->mad_list.list, list);
1211 }
1212 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1213 if (ret) {
1214 ib_dma_unmap_single(mad_agent->device,
1215 mad_send_wr->header_mapping,
1216 sge[0].length, DMA_TO_DEVICE);
1217 ib_dma_unmap_single(mad_agent->device,
1218 mad_send_wr->payload_mapping,
1219 sge[1].length, DMA_TO_DEVICE);
1220 }
1221 return ret;
1222}
1223
1224/*
1225 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1226 * with the registered client
1227 */
1228int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1229 struct ib_mad_send_buf **bad_send_buf)
1230{
1231 struct ib_mad_agent_private *mad_agent_priv;
1232 struct ib_mad_send_buf *next_send_buf;
1233 struct ib_mad_send_wr_private *mad_send_wr;
1234 unsigned long flags;
1235 int ret = -EINVAL;
1236
1237 /* Walk list of send WRs and post each on send list */
1238 for (; send_buf; send_buf = next_send_buf) {
1239 mad_send_wr = container_of(send_buf,
1240 struct ib_mad_send_wr_private,
1241 send_buf);
1242 mad_agent_priv = mad_send_wr->mad_agent_priv;
1243
1244 ret = ib_mad_enforce_security(mad_agent_priv,
1245 mad_send_wr->send_wr.pkey_index);
1246 if (ret)
1247 goto error;
1248
1249 if (!send_buf->mad_agent->send_handler ||
1250 (send_buf->timeout_ms &&
1251 !send_buf->mad_agent->recv_handler)) {
1252 ret = -EINVAL;
1253 goto error;
1254 }
1255
1256 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1257 if (mad_agent_priv->agent.rmpp_version) {
1258 ret = -EINVAL;
1259 goto error;
1260 }
1261 }
1262
1263 /*
1264 * Save pointer to next work request to post in case the
1265 * current one completes, and the user modifies the work
1266 * request associated with the completion
1267 */
1268 next_send_buf = send_buf->next;
1269 mad_send_wr->send_wr.ah = send_buf->ah;
1270
1271 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1272 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1273 ret = handle_outgoing_dr_smp(mad_agent_priv,
1274 mad_send_wr);
1275 if (ret < 0) /* error */
1276 goto error;
1277 else if (ret == 1) /* locally consumed */
1278 continue;
1279 }
1280
1281 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1282 /* Timeout will be updated after send completes */
1283 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1284 mad_send_wr->max_retries = send_buf->retries;
1285 mad_send_wr->retries_left = send_buf->retries;
1286 send_buf->retries = 0;
1287 /* Reference for work request to QP + response */
1288 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1289 mad_send_wr->status = IB_WC_SUCCESS;
1290
1291 /* Reference MAD agent until send completes */
1292 atomic_inc(&mad_agent_priv->refcount);
1293 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1294 list_add_tail(&mad_send_wr->agent_list,
1295 &mad_agent_priv->send_list);
1296 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1297
1298 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1299 ret = ib_send_rmpp_mad(mad_send_wr);
1300 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1301 ret = ib_send_mad(mad_send_wr);
1302 } else
1303 ret = ib_send_mad(mad_send_wr);
1304 if (ret < 0) {
1305 /* Fail send request */
1306 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1307 list_del(&mad_send_wr->agent_list);
1308 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1309 atomic_dec(&mad_agent_priv->refcount);
1310 goto error;
1311 }
1312 }
1313 return 0;
1314error:
1315 if (bad_send_buf)
1316 *bad_send_buf = send_buf;
1317 return ret;
1318}
1319EXPORT_SYMBOL(ib_post_send_mad);
1320
1321/*
1322 * ib_free_recv_mad - Returns data buffers used to receive
1323 * a MAD to the access layer
1324 */
1325void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1326{
1327 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1328 struct ib_mad_private_header *mad_priv_hdr;
1329 struct ib_mad_private *priv;
1330 struct list_head free_list;
1331
1332 INIT_LIST_HEAD(&free_list);
1333 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1334
1335 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1336 &free_list, list) {
1337 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1338 recv_buf);
1339 mad_priv_hdr = container_of(mad_recv_wc,
1340 struct ib_mad_private_header,
1341 recv_wc);
1342 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1343 header);
1344 kfree(priv);
1345 }
1346}
1347EXPORT_SYMBOL(ib_free_recv_mad);
1348
1349struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1350 u8 rmpp_version,
1351 ib_mad_send_handler send_handler,
1352 ib_mad_recv_handler recv_handler,
1353 void *context)
1354{
1355 return ERR_PTR(-EINVAL); /* XXX: for now */
1356}
1357EXPORT_SYMBOL(ib_redirect_mad_qp);
1358
1359int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1360 struct ib_wc *wc)
1361{
1362 dev_err(&mad_agent->device->dev,
1363 "ib_process_mad_wc() not implemented yet\n");
1364 return 0;
1365}
1366EXPORT_SYMBOL(ib_process_mad_wc);
1367
1368static int method_in_use(struct ib_mad_mgmt_method_table **method,
1369 struct ib_mad_reg_req *mad_reg_req)
1370{
1371 int i;
1372
1373 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1374 if ((*method)->agent[i]) {
1375 pr_err("Method %d already in use\n", i);
1376 return -EINVAL;
1377 }
1378 }
1379 return 0;
1380}
1381
1382static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1383{
1384 /* Allocate management method table */
1385 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1386 return (*method) ? 0 : (-ENOMEM);
1387}
1388
1389/*
1390 * Check to see if there are any methods still in use
1391 */
1392static int check_method_table(struct ib_mad_mgmt_method_table *method)
1393{
1394 int i;
1395
1396 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1397 if (method->agent[i])
1398 return 1;
1399 return 0;
1400}
1401
1402/*
1403 * Check to see if there are any method tables for this class still in use
1404 */
1405static int check_class_table(struct ib_mad_mgmt_class_table *class)
1406{
1407 int i;
1408
1409 for (i = 0; i < MAX_MGMT_CLASS; i++)
1410 if (class->method_table[i])
1411 return 1;
1412 return 0;
1413}
1414
1415static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1416{
1417 int i;
1418
1419 for (i = 0; i < MAX_MGMT_OUI; i++)
1420 if (vendor_class->method_table[i])
1421 return 1;
1422 return 0;
1423}
1424
1425static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1426 const char *oui)
1427{
1428 int i;
1429
1430 for (i = 0; i < MAX_MGMT_OUI; i++)
1431 /* Is there matching OUI for this vendor class ? */
1432 if (!memcmp(vendor_class->oui[i], oui, 3))
1433 return i;
1434
1435 return -1;
1436}
1437
1438static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1439{
1440 int i;
1441
1442 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1443 if (vendor->vendor_class[i])
1444 return 1;
1445
1446 return 0;
1447}
1448
1449static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1450 struct ib_mad_agent_private *agent)
1451{
1452 int i;
1453
1454 /* Remove any methods for this mad agent */
1455 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1456 if (method->agent[i] == agent) {
1457 method->agent[i] = NULL;
1458 }
1459 }
1460}
1461
1462static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1463 struct ib_mad_agent_private *agent_priv,
1464 u8 mgmt_class)
1465{
1466 struct ib_mad_port_private *port_priv;
1467 struct ib_mad_mgmt_class_table **class;
1468 struct ib_mad_mgmt_method_table **method;
1469 int i, ret;
1470
1471 port_priv = agent_priv->qp_info->port_priv;
1472 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1473 if (!*class) {
1474 /* Allocate management class table for "new" class version */
1475 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1476 if (!*class) {
1477 ret = -ENOMEM;
1478 goto error1;
1479 }
1480
1481 /* Allocate method table for this management class */
1482 method = &(*class)->method_table[mgmt_class];
1483 if ((ret = allocate_method_table(method)))
1484 goto error2;
1485 } else {
1486 method = &(*class)->method_table[mgmt_class];
1487 if (!*method) {
1488 /* Allocate method table for this management class */
1489 if ((ret = allocate_method_table(method)))
1490 goto error1;
1491 }
1492 }
1493
1494 /* Now, make sure methods are not already in use */
1495 if (method_in_use(method, mad_reg_req))
1496 goto error3;
1497
1498 /* Finally, add in methods being registered */
1499 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1500 (*method)->agent[i] = agent_priv;
1501
1502 return 0;
1503
1504error3:
1505 /* Remove any methods for this mad agent */
1506 remove_methods_mad_agent(*method, agent_priv);
1507 /* Now, check to see if there are any methods in use */
1508 if (!check_method_table(*method)) {
1509 /* If not, release management method table */
1510 kfree(*method);
1511 *method = NULL;
1512 }
1513 ret = -EINVAL;
1514 goto error1;
1515error2:
1516 kfree(*class);
1517 *class = NULL;
1518error1:
1519 return ret;
1520}
1521
1522static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1523 struct ib_mad_agent_private *agent_priv)
1524{
1525 struct ib_mad_port_private *port_priv;
1526 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1527 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1528 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1529 struct ib_mad_mgmt_method_table **method;
1530 int i, ret = -ENOMEM;
1531 u8 vclass;
1532
1533 /* "New" vendor (with OUI) class */
1534 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1535 port_priv = agent_priv->qp_info->port_priv;
1536 vendor_table = &port_priv->version[
1537 mad_reg_req->mgmt_class_version].vendor;
1538 if (!*vendor_table) {
1539 /* Allocate mgmt vendor class table for "new" class version */
1540 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1541 if (!vendor)
1542 goto error1;
1543
1544 *vendor_table = vendor;
1545 }
1546 if (!(*vendor_table)->vendor_class[vclass]) {
1547 /* Allocate table for this management vendor class */
1548 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1549 if (!vendor_class)
1550 goto error2;
1551
1552 (*vendor_table)->vendor_class[vclass] = vendor_class;
1553 }
1554 for (i = 0; i < MAX_MGMT_OUI; i++) {
1555 /* Is there matching OUI for this vendor class ? */
1556 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1557 mad_reg_req->oui, 3)) {
1558 method = &(*vendor_table)->vendor_class[
1559 vclass]->method_table[i];
1560 BUG_ON(!*method);
1561 goto check_in_use;
1562 }
1563 }
1564 for (i = 0; i < MAX_MGMT_OUI; i++) {
1565 /* OUI slot available ? */
1566 if (!is_vendor_oui((*vendor_table)->vendor_class[
1567 vclass]->oui[i])) {
1568 method = &(*vendor_table)->vendor_class[
1569 vclass]->method_table[i];
1570 BUG_ON(*method);
1571 /* Allocate method table for this OUI */
1572 if ((ret = allocate_method_table(method)))
1573 goto error3;
1574 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1575 mad_reg_req->oui, 3);
1576 goto check_in_use;
1577 }
1578 }
1579 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1580 goto error3;
1581
1582check_in_use:
1583 /* Now, make sure methods are not already in use */
1584 if (method_in_use(method, mad_reg_req))
1585 goto error4;
1586
1587 /* Finally, add in methods being registered */
1588 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1589 (*method)->agent[i] = agent_priv;
1590
1591 return 0;
1592
1593error4:
1594 /* Remove any methods for this mad agent */
1595 remove_methods_mad_agent(*method, agent_priv);
1596 /* Now, check to see if there are any methods in use */
1597 if (!check_method_table(*method)) {
1598 /* If not, release management method table */
1599 kfree(*method);
1600 *method = NULL;
1601 }
1602 ret = -EINVAL;
1603error3:
1604 if (vendor_class) {
1605 (*vendor_table)->vendor_class[vclass] = NULL;
1606 kfree(vendor_class);
1607 }
1608error2:
1609 if (vendor) {
1610 *vendor_table = NULL;
1611 kfree(vendor);
1612 }
1613error1:
1614 return ret;
1615}
1616
1617static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1618{
1619 struct ib_mad_port_private *port_priv;
1620 struct ib_mad_mgmt_class_table *class;
1621 struct ib_mad_mgmt_method_table *method;
1622 struct ib_mad_mgmt_vendor_class_table *vendor;
1623 struct ib_mad_mgmt_vendor_class *vendor_class;
1624 int index;
1625 u8 mgmt_class;
1626
1627 /*
1628 * Was MAD registration request supplied
1629 * with original registration ?
1630 */
1631 if (!agent_priv->reg_req) {
1632 goto out;
1633 }
1634
1635 port_priv = agent_priv->qp_info->port_priv;
1636 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1637 class = port_priv->version[
1638 agent_priv->reg_req->mgmt_class_version].class;
1639 if (!class)
1640 goto vendor_check;
1641
1642 method = class->method_table[mgmt_class];
1643 if (method) {
1644 /* Remove any methods for this mad agent */
1645 remove_methods_mad_agent(method, agent_priv);
1646 /* Now, check to see if there are any methods still in use */
1647 if (!check_method_table(method)) {
1648 /* If not, release management method table */
1649 kfree(method);
1650 class->method_table[mgmt_class] = NULL;
1651 /* Any management classes left ? */
1652 if (!check_class_table(class)) {
1653 /* If not, release management class table */
1654 kfree(class);
1655 port_priv->version[
1656 agent_priv->reg_req->
1657 mgmt_class_version].class = NULL;
1658 }
1659 }
1660 }
1661
1662vendor_check:
1663 if (!is_vendor_class(mgmt_class))
1664 goto out;
1665
1666 /* normalize mgmt_class to vendor range 2 */
1667 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1668 vendor = port_priv->version[
1669 agent_priv->reg_req->mgmt_class_version].vendor;
1670
1671 if (!vendor)
1672 goto out;
1673
1674 vendor_class = vendor->vendor_class[mgmt_class];
1675 if (vendor_class) {
1676 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1677 if (index < 0)
1678 goto out;
1679 method = vendor_class->method_table[index];
1680 if (method) {
1681 /* Remove any methods for this mad agent */
1682 remove_methods_mad_agent(method, agent_priv);
1683 /*
1684 * Now, check to see if there are
1685 * any methods still in use
1686 */
1687 if (!check_method_table(method)) {
1688 /* If not, release management method table */
1689 kfree(method);
1690 vendor_class->method_table[index] = NULL;
1691 memset(vendor_class->oui[index], 0, 3);
1692 /* Any OUIs left ? */
1693 if (!check_vendor_class(vendor_class)) {
1694 /* If not, release vendor class table */
1695 kfree(vendor_class);
1696 vendor->vendor_class[mgmt_class] = NULL;
1697 /* Any other vendor classes left ? */
1698 if (!check_vendor_table(vendor)) {
1699 kfree(vendor);
1700 port_priv->version[
1701 agent_priv->reg_req->
1702 mgmt_class_version].
1703 vendor = NULL;
1704 }
1705 }
1706 }
1707 }
1708 }
1709
1710out:
1711 return;
1712}
1713
1714static struct ib_mad_agent_private *
1715find_mad_agent(struct ib_mad_port_private *port_priv,
1716 const struct ib_mad_hdr *mad_hdr)
1717{
1718 struct ib_mad_agent_private *mad_agent = NULL;
1719 unsigned long flags;
1720
1721 spin_lock_irqsave(&port_priv->reg_lock, flags);
1722 if (ib_response_mad(mad_hdr)) {
1723 u32 hi_tid;
1724 struct ib_mad_agent_private *entry;
1725
1726 /*
1727 * Routing is based on high 32 bits of transaction ID
1728 * of MAD.
1729 */
1730 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1731 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1732 if (entry->agent.hi_tid == hi_tid) {
1733 mad_agent = entry;
1734 break;
1735 }
1736 }
1737 } else {
1738 struct ib_mad_mgmt_class_table *class;
1739 struct ib_mad_mgmt_method_table *method;
1740 struct ib_mad_mgmt_vendor_class_table *vendor;
1741 struct ib_mad_mgmt_vendor_class *vendor_class;
1742 const struct ib_vendor_mad *vendor_mad;
1743 int index;
1744
1745 /*
1746 * Routing is based on version, class, and method
1747 * For "newer" vendor MADs, also based on OUI
1748 */
1749 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1750 goto out;
1751 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1752 class = port_priv->version[
1753 mad_hdr->class_version].class;
1754 if (!class)
1755 goto out;
1756 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1757 ARRAY_SIZE(class->method_table))
1758 goto out;
1759 method = class->method_table[convert_mgmt_class(
1760 mad_hdr->mgmt_class)];
1761 if (method)
1762 mad_agent = method->agent[mad_hdr->method &
1763 ~IB_MGMT_METHOD_RESP];
1764 } else {
1765 vendor = port_priv->version[
1766 mad_hdr->class_version].vendor;
1767 if (!vendor)
1768 goto out;
1769 vendor_class = vendor->vendor_class[vendor_class_index(
1770 mad_hdr->mgmt_class)];
1771 if (!vendor_class)
1772 goto out;
1773 /* Find matching OUI */
1774 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1775 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1776 if (index == -1)
1777 goto out;
1778 method = vendor_class->method_table[index];
1779 if (method) {
1780 mad_agent = method->agent[mad_hdr->method &
1781 ~IB_MGMT_METHOD_RESP];
1782 }
1783 }
1784 }
1785
1786 if (mad_agent) {
1787 if (mad_agent->agent.recv_handler)
1788 atomic_inc(&mad_agent->refcount);
1789 else {
1790 dev_notice(&port_priv->device->dev,
1791 "No receive handler for client %p on port %d\n",
1792 &mad_agent->agent, port_priv->port_num);
1793 mad_agent = NULL;
1794 }
1795 }
1796out:
1797 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1798
1799 return mad_agent;
1800}
1801
1802static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1803 const struct ib_mad_qp_info *qp_info,
1804 bool opa)
1805{
1806 int valid = 0;
1807 u32 qp_num = qp_info->qp->qp_num;
1808
1809 /* Make sure MAD base version is understood */
1810 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1811 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1812 pr_err("MAD received with unsupported base version %d %s\n",
1813 mad_hdr->base_version, opa ? "(opa)" : "");
1814 goto out;
1815 }
1816
1817 /* Filter SMI packets sent to other than QP0 */
1818 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1819 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1820 if (qp_num == 0)
1821 valid = 1;
1822 } else {
1823 /* CM attributes other than ClassPortInfo only use Send method */
1824 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1825 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1826 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1827 goto out;
1828 /* Filter GSI packets sent to QP0 */
1829 if (qp_num != 0)
1830 valid = 1;
1831 }
1832
1833out:
1834 return valid;
1835}
1836
1837static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1838 const struct ib_mad_hdr *mad_hdr)
1839{
1840 struct ib_rmpp_mad *rmpp_mad;
1841
1842 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1843 return !mad_agent_priv->agent.rmpp_version ||
1844 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1845 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1846 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1847 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1848}
1849
1850static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1851 const struct ib_mad_recv_wc *rwc)
1852{
1853 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1854 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1855}
1856
1857static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1858 const struct ib_mad_send_wr_private *wr,
1859 const struct ib_mad_recv_wc *rwc )
1860{
1861 struct rdma_ah_attr attr;
1862 u8 send_resp, rcv_resp;
1863 union ib_gid sgid;
1864 struct ib_device *device = mad_agent_priv->agent.device;
1865 u8 port_num = mad_agent_priv->agent.port_num;
1866 u8 lmc;
1867 bool has_grh;
1868
1869 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1870 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1871
1872 if (send_resp == rcv_resp)
1873 /* both requests, or both responses. GIDs different */
1874 return 0;
1875
1876 if (rdma_query_ah(wr->send_buf.ah, &attr))
1877 /* Assume not equal, to avoid false positives. */
1878 return 0;
1879
1880 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1881 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1882 /* one has GID, other does not. Assume different */
1883 return 0;
1884
1885 if (!send_resp && rcv_resp) {
1886 /* is request/response. */
1887 if (!has_grh) {
1888 if (ib_get_cached_lmc(device, port_num, &lmc))
1889 return 0;
1890 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1891 rwc->wc->dlid_path_bits) &
1892 ((1 << lmc) - 1)));
1893 } else {
1894 const struct ib_global_route *grh =
1895 rdma_ah_read_grh(&attr);
1896
1897 if (ib_get_cached_gid(device, port_num,
1898 grh->sgid_index, &sgid, NULL))
1899 return 0;
1900 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1901 16);
1902 }
1903 }
1904
1905 if (!has_grh)
1906 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1907 else
1908 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1909 rwc->recv_buf.grh->sgid.raw,
1910 16);
1911}
1912
1913static inline int is_direct(u8 class)
1914{
1915 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1916}
1917
1918struct ib_mad_send_wr_private*
1919ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1920 const struct ib_mad_recv_wc *wc)
1921{
1922 struct ib_mad_send_wr_private *wr;
1923 const struct ib_mad_hdr *mad_hdr;
1924
1925 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1926
1927 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1928 if ((wr->tid == mad_hdr->tid) &&
1929 rcv_has_same_class(wr, wc) &&
1930 /*
1931 * Don't check GID for direct routed MADs.
1932 * These might have permissive LIDs.
1933 */
1934 (is_direct(mad_hdr->mgmt_class) ||
1935 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1936 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1937 }
1938
1939 /*
1940 * It's possible to receive the response before we've
1941 * been notified that the send has completed
1942 */
1943 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1944 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1945 wr->tid == mad_hdr->tid &&
1946 wr->timeout &&
1947 rcv_has_same_class(wr, wc) &&
1948 /*
1949 * Don't check GID for direct routed MADs.
1950 * These might have permissive LIDs.
1951 */
1952 (is_direct(mad_hdr->mgmt_class) ||
1953 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1954 /* Verify request has not been canceled */
1955 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1956 }
1957 return NULL;
1958}
1959
1960void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1961{
1962 mad_send_wr->timeout = 0;
1963 if (mad_send_wr->refcount == 1)
1964 list_move_tail(&mad_send_wr->agent_list,
1965 &mad_send_wr->mad_agent_priv->done_list);
1966}
1967
1968static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1969 struct ib_mad_recv_wc *mad_recv_wc)
1970{
1971 struct ib_mad_send_wr_private *mad_send_wr;
1972 struct ib_mad_send_wc mad_send_wc;
1973 unsigned long flags;
1974 int ret;
1975
1976 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1977 ret = ib_mad_enforce_security(mad_agent_priv,
1978 mad_recv_wc->wc->pkey_index);
1979 if (ret) {
1980 ib_free_recv_mad(mad_recv_wc);
1981 deref_mad_agent(mad_agent_priv);
1982 return;
1983 }
1984
1985 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1986 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1987 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1988 mad_recv_wc);
1989 if (!mad_recv_wc) {
1990 deref_mad_agent(mad_agent_priv);
1991 return;
1992 }
1993 }
1994
1995 /* Complete corresponding request */
1996 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1997 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1998 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1999 if (!mad_send_wr) {
2000 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2001 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
2002 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
2003 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
2004 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
2005 /* user rmpp is in effect
2006 * and this is an active RMPP MAD
2007 */
2008 mad_agent_priv->agent.recv_handler(
2009 &mad_agent_priv->agent, NULL,
2010 mad_recv_wc);
2011 atomic_dec(&mad_agent_priv->refcount);
2012 } else {
2013 /* not user rmpp, revert to normal behavior and
2014 * drop the mad */
2015 ib_free_recv_mad(mad_recv_wc);
2016 deref_mad_agent(mad_agent_priv);
2017 return;
2018 }
2019 } else {
2020 ib_mark_mad_done(mad_send_wr);
2021 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2022
2023 /* Defined behavior is to complete response before request */
2024 mad_agent_priv->agent.recv_handler(
2025 &mad_agent_priv->agent,
2026 &mad_send_wr->send_buf,
2027 mad_recv_wc);
2028 atomic_dec(&mad_agent_priv->refcount);
2029
2030 mad_send_wc.status = IB_WC_SUCCESS;
2031 mad_send_wc.vendor_err = 0;
2032 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2033 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2034 }
2035 } else {
2036 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2037 mad_recv_wc);
2038 deref_mad_agent(mad_agent_priv);
2039 }
2040
2041 return;
2042}
2043
2044static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2045 const struct ib_mad_qp_info *qp_info,
2046 const struct ib_wc *wc,
2047 int port_num,
2048 struct ib_mad_private *recv,
2049 struct ib_mad_private *response)
2050{
2051 enum smi_forward_action retsmi;
2052 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2053
2054 if (smi_handle_dr_smp_recv(smp,
2055 rdma_cap_ib_switch(port_priv->device),
2056 port_num,
2057 port_priv->device->phys_port_cnt) ==
2058 IB_SMI_DISCARD)
2059 return IB_SMI_DISCARD;
2060
2061 retsmi = smi_check_forward_dr_smp(smp);
2062 if (retsmi == IB_SMI_LOCAL)
2063 return IB_SMI_HANDLE;
2064
2065 if (retsmi == IB_SMI_SEND) { /* don't forward */
2066 if (smi_handle_dr_smp_send(smp,
2067 rdma_cap_ib_switch(port_priv->device),
2068 port_num) == IB_SMI_DISCARD)
2069 return IB_SMI_DISCARD;
2070
2071 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2072 return IB_SMI_DISCARD;
2073 } else if (rdma_cap_ib_switch(port_priv->device)) {
2074 /* forward case for switches */
2075 memcpy(response, recv, mad_priv_size(response));
2076 response->header.recv_wc.wc = &response->header.wc;
2077 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2078 response->header.recv_wc.recv_buf.grh = &response->grh;
2079
2080 agent_send_response((const struct ib_mad_hdr *)response->mad,
2081 &response->grh, wc,
2082 port_priv->device,
2083 smi_get_fwd_port(smp),
2084 qp_info->qp->qp_num,
2085 response->mad_size,
2086 false);
2087
2088 return IB_SMI_DISCARD;
2089 }
2090 return IB_SMI_HANDLE;
2091}
2092
2093static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2094 struct ib_mad_private *response,
2095 size_t *resp_len, bool opa)
2096{
2097 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2098 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2099
2100 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2101 recv_hdr->method == IB_MGMT_METHOD_SET) {
2102 memcpy(response, recv, mad_priv_size(response));
2103 response->header.recv_wc.wc = &response->header.wc;
2104 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2105 response->header.recv_wc.recv_buf.grh = &response->grh;
2106 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2107 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2108 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2109 resp_hdr->status |= IB_SMP_DIRECTION;
2110
2111 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2112 if (recv_hdr->mgmt_class ==
2113 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2114 recv_hdr->mgmt_class ==
2115 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2116 *resp_len = opa_get_smp_header_size(
2117 (struct opa_smp *)recv->mad);
2118 else
2119 *resp_len = sizeof(struct ib_mad_hdr);
2120 }
2121
2122 return true;
2123 } else {
2124 return false;
2125 }
2126}
2127
2128static enum smi_action
2129handle_opa_smi(struct ib_mad_port_private *port_priv,
2130 struct ib_mad_qp_info *qp_info,
2131 struct ib_wc *wc,
2132 int port_num,
2133 struct ib_mad_private *recv,
2134 struct ib_mad_private *response)
2135{
2136 enum smi_forward_action retsmi;
2137 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2138
2139 if (opa_smi_handle_dr_smp_recv(smp,
2140 rdma_cap_ib_switch(port_priv->device),
2141 port_num,
2142 port_priv->device->phys_port_cnt) ==
2143 IB_SMI_DISCARD)
2144 return IB_SMI_DISCARD;
2145
2146 retsmi = opa_smi_check_forward_dr_smp(smp);
2147 if (retsmi == IB_SMI_LOCAL)
2148 return IB_SMI_HANDLE;
2149
2150 if (retsmi == IB_SMI_SEND) { /* don't forward */
2151 if (opa_smi_handle_dr_smp_send(smp,
2152 rdma_cap_ib_switch(port_priv->device),
2153 port_num) == IB_SMI_DISCARD)
2154 return IB_SMI_DISCARD;
2155
2156 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2157 IB_SMI_DISCARD)
2158 return IB_SMI_DISCARD;
2159
2160 } else if (rdma_cap_ib_switch(port_priv->device)) {
2161 /* forward case for switches */
2162 memcpy(response, recv, mad_priv_size(response));
2163 response->header.recv_wc.wc = &response->header.wc;
2164 response->header.recv_wc.recv_buf.opa_mad =
2165 (struct opa_mad *)response->mad;
2166 response->header.recv_wc.recv_buf.grh = &response->grh;
2167
2168 agent_send_response((const struct ib_mad_hdr *)response->mad,
2169 &response->grh, wc,
2170 port_priv->device,
2171 opa_smi_get_fwd_port(smp),
2172 qp_info->qp->qp_num,
2173 recv->header.wc.byte_len,
2174 true);
2175
2176 return IB_SMI_DISCARD;
2177 }
2178
2179 return IB_SMI_HANDLE;
2180}
2181
2182static enum smi_action
2183handle_smi(struct ib_mad_port_private *port_priv,
2184 struct ib_mad_qp_info *qp_info,
2185 struct ib_wc *wc,
2186 int port_num,
2187 struct ib_mad_private *recv,
2188 struct ib_mad_private *response,
2189 bool opa)
2190{
2191 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2192
2193 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2194 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2195 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2196 response);
2197
2198 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2199}
2200
2201static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2202{
2203 struct ib_mad_port_private *port_priv = cq->cq_context;
2204 struct ib_mad_list_head *mad_list =
2205 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2206 struct ib_mad_qp_info *qp_info;
2207 struct ib_mad_private_header *mad_priv_hdr;
2208 struct ib_mad_private *recv, *response = NULL;
2209 struct ib_mad_agent_private *mad_agent;
2210 int port_num;
2211 int ret = IB_MAD_RESULT_SUCCESS;
2212 size_t mad_size;
2213 u16 resp_mad_pkey_index = 0;
2214 bool opa;
2215
2216 if (list_empty_careful(&port_priv->port_list))
2217 return;
2218
2219 if (wc->status != IB_WC_SUCCESS) {
2220 /*
2221 * Receive errors indicate that the QP has entered the error
2222 * state - error handling/shutdown code will cleanup
2223 */
2224 return;
2225 }
2226
2227 qp_info = mad_list->mad_queue->qp_info;
2228 dequeue_mad(mad_list);
2229
2230 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2231 qp_info->port_priv->port_num);
2232
2233 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2234 mad_list);
2235 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2236 ib_dma_unmap_single(port_priv->device,
2237 recv->header.mapping,
2238 mad_priv_dma_size(recv),
2239 DMA_FROM_DEVICE);
2240
2241 /* Setup MAD receive work completion from "normal" work completion */
2242 recv->header.wc = *wc;
2243 recv->header.recv_wc.wc = &recv->header.wc;
2244
2245 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2246 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2247 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2248 } else {
2249 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2250 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2251 }
2252
2253 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2254 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2255
2256 if (atomic_read(&qp_info->snoop_count))
2257 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2258
2259 /* Validate MAD */
2260 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2261 goto out;
2262
2263 mad_size = recv->mad_size;
2264 response = alloc_mad_private(mad_size, GFP_KERNEL);
2265 if (!response)
2266 goto out;
2267
2268 if (rdma_cap_ib_switch(port_priv->device))
2269 port_num = wc->port_num;
2270 else
2271 port_num = port_priv->port_num;
2272
2273 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2274 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2275 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2276 response, opa)
2277 == IB_SMI_DISCARD)
2278 goto out;
2279 }
2280
2281 /* Give driver "right of first refusal" on incoming MAD */
2282 if (port_priv->device->process_mad) {
2283 ret = port_priv->device->process_mad(port_priv->device, 0,
2284 port_priv->port_num,
2285 wc, &recv->grh,
2286 (const struct ib_mad_hdr *)recv->mad,
2287 recv->mad_size,
2288 (struct ib_mad_hdr *)response->mad,
2289 &mad_size, &resp_mad_pkey_index);
2290
2291 if (opa)
2292 wc->pkey_index = resp_mad_pkey_index;
2293
2294 if (ret & IB_MAD_RESULT_SUCCESS) {
2295 if (ret & IB_MAD_RESULT_CONSUMED)
2296 goto out;
2297 if (ret & IB_MAD_RESULT_REPLY) {
2298 agent_send_response((const struct ib_mad_hdr *)response->mad,
2299 &recv->grh, wc,
2300 port_priv->device,
2301 port_num,
2302 qp_info->qp->qp_num,
2303 mad_size, opa);
2304 goto out;
2305 }
2306 }
2307 }
2308
2309 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2310 if (mad_agent) {
2311 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2312 /*
2313 * recv is freed up in error cases in ib_mad_complete_recv
2314 * or via recv_handler in ib_mad_complete_recv()
2315 */
2316 recv = NULL;
2317 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2318 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2319 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2320 port_priv->device, port_num,
2321 qp_info->qp->qp_num, mad_size, opa);
2322 }
2323
2324out:
2325 /* Post another receive request for this QP */
2326 if (response) {
2327 ib_mad_post_receive_mads(qp_info, response);
2328 kfree(recv);
2329 } else
2330 ib_mad_post_receive_mads(qp_info, recv);
2331}
2332
2333static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2334{
2335 struct ib_mad_send_wr_private *mad_send_wr;
2336 unsigned long delay;
2337
2338 if (list_empty(&mad_agent_priv->wait_list)) {
2339 cancel_delayed_work(&mad_agent_priv->timed_work);
2340 } else {
2341 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2342 struct ib_mad_send_wr_private,
2343 agent_list);
2344
2345 if (time_after(mad_agent_priv->timeout,
2346 mad_send_wr->timeout)) {
2347 mad_agent_priv->timeout = mad_send_wr->timeout;
2348 delay = mad_send_wr->timeout - jiffies;
2349 if ((long)delay <= 0)
2350 delay = 1;
2351 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2352 &mad_agent_priv->timed_work, delay);
2353 }
2354 }
2355}
2356
2357static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2358{
2359 struct ib_mad_agent_private *mad_agent_priv;
2360 struct ib_mad_send_wr_private *temp_mad_send_wr;
2361 struct list_head *list_item;
2362 unsigned long delay;
2363
2364 mad_agent_priv = mad_send_wr->mad_agent_priv;
2365 list_del(&mad_send_wr->agent_list);
2366
2367 delay = mad_send_wr->timeout;
2368 mad_send_wr->timeout += jiffies;
2369
2370 if (delay) {
2371 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2372 temp_mad_send_wr = list_entry(list_item,
2373 struct ib_mad_send_wr_private,
2374 agent_list);
2375 if (time_after(mad_send_wr->timeout,
2376 temp_mad_send_wr->timeout))
2377 break;
2378 }
2379 }
2380 else
2381 list_item = &mad_agent_priv->wait_list;
2382 list_add(&mad_send_wr->agent_list, list_item);
2383
2384 /* Reschedule a work item if we have a shorter timeout */
2385 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2386 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2387 &mad_agent_priv->timed_work, delay);
2388}
2389
2390void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2391 int timeout_ms)
2392{
2393 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2394 wait_for_response(mad_send_wr);
2395}
2396
2397/*
2398 * Process a send work completion
2399 */
2400void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2401 struct ib_mad_send_wc *mad_send_wc)
2402{
2403 struct ib_mad_agent_private *mad_agent_priv;
2404 unsigned long flags;
2405 int ret;
2406
2407 mad_agent_priv = mad_send_wr->mad_agent_priv;
2408 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2409 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2410 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2411 if (ret == IB_RMPP_RESULT_CONSUMED)
2412 goto done;
2413 } else
2414 ret = IB_RMPP_RESULT_UNHANDLED;
2415
2416 if (mad_send_wc->status != IB_WC_SUCCESS &&
2417 mad_send_wr->status == IB_WC_SUCCESS) {
2418 mad_send_wr->status = mad_send_wc->status;
2419 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2420 }
2421
2422 if (--mad_send_wr->refcount > 0) {
2423 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2424 mad_send_wr->status == IB_WC_SUCCESS) {
2425 wait_for_response(mad_send_wr);
2426 }
2427 goto done;
2428 }
2429
2430 /* Remove send from MAD agent and notify client of completion */
2431 list_del(&mad_send_wr->agent_list);
2432 adjust_timeout(mad_agent_priv);
2433 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2434
2435 if (mad_send_wr->status != IB_WC_SUCCESS )
2436 mad_send_wc->status = mad_send_wr->status;
2437 if (ret == IB_RMPP_RESULT_INTERNAL)
2438 ib_rmpp_send_handler(mad_send_wc);
2439 else
2440 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2441 mad_send_wc);
2442
2443 /* Release reference on agent taken when sending */
2444 deref_mad_agent(mad_agent_priv);
2445 return;
2446done:
2447 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2448}
2449
2450static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2451{
2452 struct ib_mad_port_private *port_priv = cq->cq_context;
2453 struct ib_mad_list_head *mad_list =
2454 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2455 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2456 struct ib_mad_qp_info *qp_info;
2457 struct ib_mad_queue *send_queue;
2458 struct ib_send_wr *bad_send_wr;
2459 struct ib_mad_send_wc mad_send_wc;
2460 unsigned long flags;
2461 int ret;
2462
2463 if (list_empty_careful(&port_priv->port_list))
2464 return;
2465
2466 if (wc->status != IB_WC_SUCCESS) {
2467 if (!ib_mad_send_error(port_priv, wc))
2468 return;
2469 }
2470
2471 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2472 mad_list);
2473 send_queue = mad_list->mad_queue;
2474 qp_info = send_queue->qp_info;
2475
2476retry:
2477 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2478 mad_send_wr->header_mapping,
2479 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2480 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2481 mad_send_wr->payload_mapping,
2482 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2483 queued_send_wr = NULL;
2484 spin_lock_irqsave(&send_queue->lock, flags);
2485 list_del(&mad_list->list);
2486
2487 /* Move queued send to the send queue */
2488 if (send_queue->count-- > send_queue->max_active) {
2489 mad_list = container_of(qp_info->overflow_list.next,
2490 struct ib_mad_list_head, list);
2491 queued_send_wr = container_of(mad_list,
2492 struct ib_mad_send_wr_private,
2493 mad_list);
2494 list_move_tail(&mad_list->list, &send_queue->list);
2495 }
2496 spin_unlock_irqrestore(&send_queue->lock, flags);
2497
2498 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2499 mad_send_wc.status = wc->status;
2500 mad_send_wc.vendor_err = wc->vendor_err;
2501 if (atomic_read(&qp_info->snoop_count))
2502 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2503 IB_MAD_SNOOP_SEND_COMPLETIONS);
2504 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2505
2506 if (queued_send_wr) {
2507 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2508 &bad_send_wr);
2509 if (ret) {
2510 dev_err(&port_priv->device->dev,
2511 "ib_post_send failed: %d\n", ret);
2512 mad_send_wr = queued_send_wr;
2513 wc->status = IB_WC_LOC_QP_OP_ERR;
2514 goto retry;
2515 }
2516 }
2517}
2518
2519static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2520{
2521 struct ib_mad_send_wr_private *mad_send_wr;
2522 struct ib_mad_list_head *mad_list;
2523 unsigned long flags;
2524
2525 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2526 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2527 mad_send_wr = container_of(mad_list,
2528 struct ib_mad_send_wr_private,
2529 mad_list);
2530 mad_send_wr->retry = 1;
2531 }
2532 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2533}
2534
2535static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2536 struct ib_wc *wc)
2537{
2538 struct ib_mad_list_head *mad_list =
2539 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2540 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2541 struct ib_mad_send_wr_private *mad_send_wr;
2542 int ret;
2543
2544 /*
2545 * Send errors will transition the QP to SQE - move
2546 * QP to RTS and repost flushed work requests
2547 */
2548 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2549 mad_list);
2550 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2551 if (mad_send_wr->retry) {
2552 /* Repost send */
2553 struct ib_send_wr *bad_send_wr;
2554
2555 mad_send_wr->retry = 0;
2556 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2557 &bad_send_wr);
2558 if (!ret)
2559 return false;
2560 }
2561 } else {
2562 struct ib_qp_attr *attr;
2563
2564 /* Transition QP to RTS and fail offending send */
2565 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2566 if (attr) {
2567 attr->qp_state = IB_QPS_RTS;
2568 attr->cur_qp_state = IB_QPS_SQE;
2569 ret = ib_modify_qp(qp_info->qp, attr,
2570 IB_QP_STATE | IB_QP_CUR_STATE);
2571 kfree(attr);
2572 if (ret)
2573 dev_err(&port_priv->device->dev,
2574 "%s - ib_modify_qp to RTS: %d\n",
2575 __func__, ret);
2576 else
2577 mark_sends_for_retry(qp_info);
2578 }
2579 }
2580
2581 return true;
2582}
2583
2584static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2585{
2586 unsigned long flags;
2587 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2588 struct ib_mad_send_wc mad_send_wc;
2589 struct list_head cancel_list;
2590
2591 INIT_LIST_HEAD(&cancel_list);
2592
2593 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2594 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2595 &mad_agent_priv->send_list, agent_list) {
2596 if (mad_send_wr->status == IB_WC_SUCCESS) {
2597 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2598 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2599 }
2600 }
2601
2602 /* Empty wait list to prevent receives from finding a request */
2603 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2604 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2605
2606 /* Report all cancelled requests */
2607 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2608 mad_send_wc.vendor_err = 0;
2609
2610 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2611 &cancel_list, agent_list) {
2612 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2613 list_del(&mad_send_wr->agent_list);
2614 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2615 &mad_send_wc);
2616 atomic_dec(&mad_agent_priv->refcount);
2617 }
2618}
2619
2620static struct ib_mad_send_wr_private*
2621find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2622 struct ib_mad_send_buf *send_buf)
2623{
2624 struct ib_mad_send_wr_private *mad_send_wr;
2625
2626 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2627 agent_list) {
2628 if (&mad_send_wr->send_buf == send_buf)
2629 return mad_send_wr;
2630 }
2631
2632 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2633 agent_list) {
2634 if (is_rmpp_data_mad(mad_agent_priv,
2635 mad_send_wr->send_buf.mad) &&
2636 &mad_send_wr->send_buf == send_buf)
2637 return mad_send_wr;
2638 }
2639 return NULL;
2640}
2641
2642int ib_modify_mad(struct ib_mad_agent *mad_agent,
2643 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2644{
2645 struct ib_mad_agent_private *mad_agent_priv;
2646 struct ib_mad_send_wr_private *mad_send_wr;
2647 unsigned long flags;
2648 int active;
2649
2650 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2651 agent);
2652 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2653 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2654 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2655 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2656 return -EINVAL;
2657 }
2658
2659 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2660 if (!timeout_ms) {
2661 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2662 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2663 }
2664
2665 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2666 if (active)
2667 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2668 else
2669 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2670
2671 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2672 return 0;
2673}
2674EXPORT_SYMBOL(ib_modify_mad);
2675
2676void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2677 struct ib_mad_send_buf *send_buf)
2678{
2679 ib_modify_mad(mad_agent, send_buf, 0);
2680}
2681EXPORT_SYMBOL(ib_cancel_mad);
2682
2683static void local_completions(struct work_struct *work)
2684{
2685 struct ib_mad_agent_private *mad_agent_priv;
2686 struct ib_mad_local_private *local;
2687 struct ib_mad_agent_private *recv_mad_agent;
2688 unsigned long flags;
2689 int free_mad;
2690 struct ib_wc wc;
2691 struct ib_mad_send_wc mad_send_wc;
2692 bool opa;
2693
2694 mad_agent_priv =
2695 container_of(work, struct ib_mad_agent_private, local_work);
2696
2697 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2698 mad_agent_priv->qp_info->port_priv->port_num);
2699
2700 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2701 while (!list_empty(&mad_agent_priv->local_list)) {
2702 local = list_entry(mad_agent_priv->local_list.next,
2703 struct ib_mad_local_private,
2704 completion_list);
2705 list_del(&local->completion_list);
2706 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2707 free_mad = 0;
2708 if (local->mad_priv) {
2709 u8 base_version;
2710 recv_mad_agent = local->recv_mad_agent;
2711 if (!recv_mad_agent) {
2712 dev_err(&mad_agent_priv->agent.device->dev,
2713 "No receive MAD agent for local completion\n");
2714 free_mad = 1;
2715 goto local_send_completion;
2716 }
2717
2718 /*
2719 * Defined behavior is to complete response
2720 * before request
2721 */
2722 build_smp_wc(recv_mad_agent->agent.qp,
2723 local->mad_send_wr->send_wr.wr.wr_cqe,
2724 be16_to_cpu(IB_LID_PERMISSIVE),
2725 local->mad_send_wr->send_wr.pkey_index,
2726 recv_mad_agent->agent.port_num, &wc);
2727
2728 local->mad_priv->header.recv_wc.wc = &wc;
2729
2730 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2731 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2732 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2733 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2734 } else {
2735 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2736 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2737 }
2738
2739 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2740 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2741 &local->mad_priv->header.recv_wc.rmpp_list);
2742 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2743 local->mad_priv->header.recv_wc.recv_buf.mad =
2744 (struct ib_mad *)local->mad_priv->mad;
2745 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2746 snoop_recv(recv_mad_agent->qp_info,
2747 &local->mad_priv->header.recv_wc,
2748 IB_MAD_SNOOP_RECVS);
2749 recv_mad_agent->agent.recv_handler(
2750 &recv_mad_agent->agent,
2751 &local->mad_send_wr->send_buf,
2752 &local->mad_priv->header.recv_wc);
2753 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2754 atomic_dec(&recv_mad_agent->refcount);
2755 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2756 }
2757
2758local_send_completion:
2759 /* Complete send */
2760 mad_send_wc.status = IB_WC_SUCCESS;
2761 mad_send_wc.vendor_err = 0;
2762 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2763 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2764 snoop_send(mad_agent_priv->qp_info,
2765 &local->mad_send_wr->send_buf,
2766 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2767 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2768 &mad_send_wc);
2769
2770 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2771 atomic_dec(&mad_agent_priv->refcount);
2772 if (free_mad)
2773 kfree(local->mad_priv);
2774 kfree(local);
2775 }
2776 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2777}
2778
2779static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2780{
2781 int ret;
2782
2783 if (!mad_send_wr->retries_left)
2784 return -ETIMEDOUT;
2785
2786 mad_send_wr->retries_left--;
2787 mad_send_wr->send_buf.retries++;
2788
2789 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2790
2791 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2792 ret = ib_retry_rmpp(mad_send_wr);
2793 switch (ret) {
2794 case IB_RMPP_RESULT_UNHANDLED:
2795 ret = ib_send_mad(mad_send_wr);
2796 break;
2797 case IB_RMPP_RESULT_CONSUMED:
2798 ret = 0;
2799 break;
2800 default:
2801 ret = -ECOMM;
2802 break;
2803 }
2804 } else
2805 ret = ib_send_mad(mad_send_wr);
2806
2807 if (!ret) {
2808 mad_send_wr->refcount++;
2809 list_add_tail(&mad_send_wr->agent_list,
2810 &mad_send_wr->mad_agent_priv->send_list);
2811 }
2812 return ret;
2813}
2814
2815static void timeout_sends(struct work_struct *work)
2816{
2817 struct ib_mad_agent_private *mad_agent_priv;
2818 struct ib_mad_send_wr_private *mad_send_wr;
2819 struct ib_mad_send_wc mad_send_wc;
2820 unsigned long flags, delay;
2821
2822 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2823 timed_work.work);
2824 mad_send_wc.vendor_err = 0;
2825
2826 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2827 while (!list_empty(&mad_agent_priv->wait_list)) {
2828 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2829 struct ib_mad_send_wr_private,
2830 agent_list);
2831
2832 if (time_after(mad_send_wr->timeout, jiffies)) {
2833 delay = mad_send_wr->timeout - jiffies;
2834 if ((long)delay <= 0)
2835 delay = 1;
2836 queue_delayed_work(mad_agent_priv->qp_info->
2837 port_priv->wq,
2838 &mad_agent_priv->timed_work, delay);
2839 break;
2840 }
2841
2842 list_del(&mad_send_wr->agent_list);
2843 if (mad_send_wr->status == IB_WC_SUCCESS &&
2844 !retry_send(mad_send_wr))
2845 continue;
2846
2847 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2848
2849 if (mad_send_wr->status == IB_WC_SUCCESS)
2850 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2851 else
2852 mad_send_wc.status = mad_send_wr->status;
2853 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2854 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2855 &mad_send_wc);
2856
2857 atomic_dec(&mad_agent_priv->refcount);
2858 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2859 }
2860 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2861}
2862
2863/*
2864 * Allocate receive MADs and post receive WRs for them
2865 */
2866static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2867 struct ib_mad_private *mad)
2868{
2869 unsigned long flags;
2870 int post, ret;
2871 struct ib_mad_private *mad_priv;
2872 struct ib_sge sg_list;
2873 struct ib_recv_wr recv_wr, *bad_recv_wr;
2874 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2875
2876 /* Initialize common scatter list fields */
2877 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2878
2879 /* Initialize common receive WR fields */
2880 recv_wr.next = NULL;
2881 recv_wr.sg_list = &sg_list;
2882 recv_wr.num_sge = 1;
2883
2884 do {
2885 /* Allocate and map receive buffer */
2886 if (mad) {
2887 mad_priv = mad;
2888 mad = NULL;
2889 } else {
2890 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2891 GFP_ATOMIC);
2892 if (!mad_priv) {
2893 ret = -ENOMEM;
2894 break;
2895 }
2896 }
2897 sg_list.length = mad_priv_dma_size(mad_priv);
2898 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2899 &mad_priv->grh,
2900 mad_priv_dma_size(mad_priv),
2901 DMA_FROM_DEVICE);
2902 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2903 sg_list.addr))) {
2904 ret = -ENOMEM;
2905 break;
2906 }
2907 mad_priv->header.mapping = sg_list.addr;
2908 mad_priv->header.mad_list.mad_queue = recv_queue;
2909 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2910 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2911
2912 /* Post receive WR */
2913 spin_lock_irqsave(&recv_queue->lock, flags);
2914 post = (++recv_queue->count < recv_queue->max_active);
2915 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2916 spin_unlock_irqrestore(&recv_queue->lock, flags);
2917 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2918 if (ret) {
2919 spin_lock_irqsave(&recv_queue->lock, flags);
2920 list_del(&mad_priv->header.mad_list.list);
2921 recv_queue->count--;
2922 spin_unlock_irqrestore(&recv_queue->lock, flags);
2923 ib_dma_unmap_single(qp_info->port_priv->device,
2924 mad_priv->header.mapping,
2925 mad_priv_dma_size(mad_priv),
2926 DMA_FROM_DEVICE);
2927 kfree(mad_priv);
2928 dev_err(&qp_info->port_priv->device->dev,
2929 "ib_post_recv failed: %d\n", ret);
2930 break;
2931 }
2932 } while (post);
2933
2934 return ret;
2935}
2936
2937/*
2938 * Return all the posted receive MADs
2939 */
2940static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2941{
2942 struct ib_mad_private_header *mad_priv_hdr;
2943 struct ib_mad_private *recv;
2944 struct ib_mad_list_head *mad_list;
2945
2946 if (!qp_info->qp)
2947 return;
2948
2949 while (!list_empty(&qp_info->recv_queue.list)) {
2950
2951 mad_list = list_entry(qp_info->recv_queue.list.next,
2952 struct ib_mad_list_head, list);
2953 mad_priv_hdr = container_of(mad_list,
2954 struct ib_mad_private_header,
2955 mad_list);
2956 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2957 header);
2958
2959 /* Remove from posted receive MAD list */
2960 list_del(&mad_list->list);
2961
2962 ib_dma_unmap_single(qp_info->port_priv->device,
2963 recv->header.mapping,
2964 mad_priv_dma_size(recv),
2965 DMA_FROM_DEVICE);
2966 kfree(recv);
2967 }
2968
2969 qp_info->recv_queue.count = 0;
2970}
2971
2972/*
2973 * Start the port
2974 */
2975static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2976{
2977 int ret, i;
2978 struct ib_qp_attr *attr;
2979 struct ib_qp *qp;
2980 u16 pkey_index;
2981
2982 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2983 if (!attr)
2984 return -ENOMEM;
2985
2986 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2987 IB_DEFAULT_PKEY_FULL, &pkey_index);
2988 if (ret)
2989 pkey_index = 0;
2990
2991 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2992 qp = port_priv->qp_info[i].qp;
2993 if (!qp)
2994 continue;
2995
2996 /*
2997 * PKey index for QP1 is irrelevant but
2998 * one is needed for the Reset to Init transition
2999 */
3000 attr->qp_state = IB_QPS_INIT;
3001 attr->pkey_index = pkey_index;
3002 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3003 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3004 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3005 if (ret) {
3006 dev_err(&port_priv->device->dev,
3007 "Couldn't change QP%d state to INIT: %d\n",
3008 i, ret);
3009 goto out;
3010 }
3011
3012 attr->qp_state = IB_QPS_RTR;
3013 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3014 if (ret) {
3015 dev_err(&port_priv->device->dev,
3016 "Couldn't change QP%d state to RTR: %d\n",
3017 i, ret);
3018 goto out;
3019 }
3020
3021 attr->qp_state = IB_QPS_RTS;
3022 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3023 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3024 if (ret) {
3025 dev_err(&port_priv->device->dev,
3026 "Couldn't change QP%d state to RTS: %d\n",
3027 i, ret);
3028 goto out;
3029 }
3030 }
3031
3032 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3033 if (ret) {
3034 dev_err(&port_priv->device->dev,
3035 "Failed to request completion notification: %d\n",
3036 ret);
3037 goto out;
3038 }
3039
3040 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3041 if (!port_priv->qp_info[i].qp)
3042 continue;
3043
3044 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3045 if (ret) {
3046 dev_err(&port_priv->device->dev,
3047 "Couldn't post receive WRs\n");
3048 goto out;
3049 }
3050 }
3051out:
3052 kfree(attr);
3053 return ret;
3054}
3055
3056static void qp_event_handler(struct ib_event *event, void *qp_context)
3057{
3058 struct ib_mad_qp_info *qp_info = qp_context;
3059
3060 /* It's worse than that! He's dead, Jim! */
3061 dev_err(&qp_info->port_priv->device->dev,
3062 "Fatal error (%d) on MAD QP (%d)\n",
3063 event->event, qp_info->qp->qp_num);
3064}
3065
3066static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3067 struct ib_mad_queue *mad_queue)
3068{
3069 mad_queue->qp_info = qp_info;
3070 mad_queue->count = 0;
3071 spin_lock_init(&mad_queue->lock);
3072 INIT_LIST_HEAD(&mad_queue->list);
3073}
3074
3075static void init_mad_qp(struct ib_mad_port_private *port_priv,
3076 struct ib_mad_qp_info *qp_info)
3077{
3078 qp_info->port_priv = port_priv;
3079 init_mad_queue(qp_info, &qp_info->send_queue);
3080 init_mad_queue(qp_info, &qp_info->recv_queue);
3081 INIT_LIST_HEAD(&qp_info->overflow_list);
3082 spin_lock_init(&qp_info->snoop_lock);
3083 qp_info->snoop_table = NULL;
3084 qp_info->snoop_table_size = 0;
3085 atomic_set(&qp_info->snoop_count, 0);
3086}
3087
3088static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3089 enum ib_qp_type qp_type)
3090{
3091 struct ib_qp_init_attr qp_init_attr;
3092 int ret;
3093
3094 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3095 qp_init_attr.send_cq = qp_info->port_priv->cq;
3096 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3097 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3098 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3099 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3100 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3101 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3102 qp_init_attr.qp_type = qp_type;
3103 qp_init_attr.port_num = qp_info->port_priv->port_num;
3104 qp_init_attr.qp_context = qp_info;
3105 qp_init_attr.event_handler = qp_event_handler;
3106 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3107 if (IS_ERR(qp_info->qp)) {
3108 dev_err(&qp_info->port_priv->device->dev,
3109 "Couldn't create ib_mad QP%d\n",
3110 get_spl_qp_index(qp_type));
3111 ret = PTR_ERR(qp_info->qp);
3112 goto error;
3113 }
3114 /* Use minimum queue sizes unless the CQ is resized */
3115 qp_info->send_queue.max_active = mad_sendq_size;
3116 qp_info->recv_queue.max_active = mad_recvq_size;
3117 return 0;
3118
3119error:
3120 return ret;
3121}
3122
3123static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3124{
3125 if (!qp_info->qp)
3126 return;
3127
3128 ib_destroy_qp(qp_info->qp);
3129 kfree(qp_info->snoop_table);
3130}
3131
3132/*
3133 * Open the port
3134 * Create the QP, PD, MR, and CQ if needed
3135 */
3136static int ib_mad_port_open(struct ib_device *device,
3137 int port_num)
3138{
3139 int ret, cq_size;
3140 struct ib_mad_port_private *port_priv;
3141 unsigned long flags;
3142 char name[sizeof "ib_mad123"];
3143 int has_smi;
3144
3145 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3146 return -EFAULT;
3147
3148 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3149 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3150 return -EFAULT;
3151
3152 /* Create new device info */
3153 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3154 if (!port_priv)
3155 return -ENOMEM;
3156
3157 port_priv->device = device;
3158 port_priv->port_num = port_num;
3159 spin_lock_init(&port_priv->reg_lock);
3160 INIT_LIST_HEAD(&port_priv->agent_list);
3161 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3162 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3163
3164 cq_size = mad_sendq_size + mad_recvq_size;
3165 has_smi = rdma_cap_ib_smi(device, port_num);
3166 if (has_smi)
3167 cq_size *= 2;
3168
3169 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3170 IB_POLL_WORKQUEUE);
3171 if (IS_ERR(port_priv->cq)) {
3172 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3173 ret = PTR_ERR(port_priv->cq);
3174 goto error3;
3175 }
3176
3177 port_priv->pd = ib_alloc_pd(device, 0);
3178 if (IS_ERR(port_priv->pd)) {
3179 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3180 ret = PTR_ERR(port_priv->pd);
3181 goto error4;
3182 }
3183
3184 if (has_smi) {
3185 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3186 if (ret)
3187 goto error6;
3188 }
3189 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3190 if (ret)
3191 goto error7;
3192
3193 snprintf(name, sizeof name, "ib_mad%d", port_num);
3194 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3195 if (!port_priv->wq) {
3196 ret = -ENOMEM;
3197 goto error8;
3198 }
3199
3200 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3201 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3202 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3203
3204 ret = ib_mad_port_start(port_priv);
3205 if (ret) {
3206 dev_err(&device->dev, "Couldn't start port\n");
3207 goto error9;
3208 }
3209
3210 return 0;
3211
3212error9:
3213 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3214 list_del_init(&port_priv->port_list);
3215 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3216
3217 destroy_workqueue(port_priv->wq);
3218error8:
3219 destroy_mad_qp(&port_priv->qp_info[1]);
3220error7:
3221 destroy_mad_qp(&port_priv->qp_info[0]);
3222error6:
3223 ib_dealloc_pd(port_priv->pd);
3224error4:
3225 ib_free_cq(port_priv->cq);
3226 cleanup_recv_queue(&port_priv->qp_info[1]);
3227 cleanup_recv_queue(&port_priv->qp_info[0]);
3228error3:
3229 kfree(port_priv);
3230
3231 return ret;
3232}
3233
3234/*
3235 * Close the port
3236 * If there are no classes using the port, free the port
3237 * resources (CQ, MR, PD, QP) and remove the port's info structure
3238 */
3239static int ib_mad_port_close(struct ib_device *device, int port_num)
3240{
3241 struct ib_mad_port_private *port_priv;
3242 unsigned long flags;
3243
3244 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3245 port_priv = __ib_get_mad_port(device, port_num);
3246 if (port_priv == NULL) {
3247 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3248 dev_err(&device->dev, "Port %d not found\n", port_num);
3249 return -ENODEV;
3250 }
3251 list_del_init(&port_priv->port_list);
3252 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3253
3254 destroy_workqueue(port_priv->wq);
3255 destroy_mad_qp(&port_priv->qp_info[1]);
3256 destroy_mad_qp(&port_priv->qp_info[0]);
3257 ib_dealloc_pd(port_priv->pd);
3258 ib_free_cq(port_priv->cq);
3259 cleanup_recv_queue(&port_priv->qp_info[1]);
3260 cleanup_recv_queue(&port_priv->qp_info[0]);
3261 /* XXX: Handle deallocation of MAD registration tables */
3262
3263 kfree(port_priv);
3264
3265 return 0;
3266}
3267
3268static void ib_mad_init_device(struct ib_device *device)
3269{
3270 int start, i;
3271
3272 start = rdma_start_port(device);
3273
3274 for (i = start; i <= rdma_end_port(device); i++) {
3275 if (!rdma_cap_ib_mad(device, i))
3276 continue;
3277
3278 if (ib_mad_port_open(device, i)) {
3279 dev_err(&device->dev, "Couldn't open port %d\n", i);
3280 goto error;
3281 }
3282 if (ib_agent_port_open(device, i)) {
3283 dev_err(&device->dev,
3284 "Couldn't open port %d for agents\n", i);
3285 goto error_agent;
3286 }
3287 }
3288 return;
3289
3290error_agent:
3291 if (ib_mad_port_close(device, i))
3292 dev_err(&device->dev, "Couldn't close port %d\n", i);
3293
3294error:
3295 while (--i >= start) {
3296 if (!rdma_cap_ib_mad(device, i))
3297 continue;
3298
3299 if (ib_agent_port_close(device, i))
3300 dev_err(&device->dev,
3301 "Couldn't close port %d for agents\n", i);
3302 if (ib_mad_port_close(device, i))
3303 dev_err(&device->dev, "Couldn't close port %d\n", i);
3304 }
3305}
3306
3307static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3308{
3309 int i;
3310
3311 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3312 if (!rdma_cap_ib_mad(device, i))
3313 continue;
3314
3315 if (ib_agent_port_close(device, i))
3316 dev_err(&device->dev,
3317 "Couldn't close port %d for agents\n", i);
3318 if (ib_mad_port_close(device, i))
3319 dev_err(&device->dev, "Couldn't close port %d\n", i);
3320 }
3321}
3322
3323static struct ib_client mad_client = {
3324 .name = "mad",
3325 .add = ib_mad_init_device,
3326 .remove = ib_mad_remove_device
3327};
3328
3329int ib_mad_init(void)
3330{
3331 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3332 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3333
3334 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3335 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3336
3337 INIT_LIST_HEAD(&ib_mad_port_list);
3338
3339 if (ib_register_client(&mad_client)) {
3340 pr_err("Couldn't register ib_mad client\n");
3341 return -EINVAL;
3342 }
3343
3344 return 0;
3345}
3346
3347void ib_mad_cleanup(void)
3348{
3349 ib_unregister_client(&mad_client);
3350}