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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 <rdma/ib_cache.h>
44
45#include "mad_priv.h"
46#include "mad_rmpp.h"
47#include "smi.h"
48#include "opa_smi.h"
49#include "agent.h"
50#include "core_priv.h"
51
52static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
53static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
54
55module_param_named(send_queue_size, mad_sendq_size, int, 0444);
56MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
57module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
58MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
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 const struct ib_mad_hdr *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);
83static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
84 struct ib_wc *wc);
85static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
86
87/*
88 * Returns a ib_mad_port_private structure or NULL for a device/port
89 * Assumes ib_mad_port_list_lock is being held
90 */
91static inline struct ib_mad_port_private *
92__ib_get_mad_port(struct ib_device *device, int port_num)
93{
94 struct ib_mad_port_private *entry;
95
96 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
97 if (entry->device == device && entry->port_num == port_num)
98 return entry;
99 }
100 return NULL;
101}
102
103/*
104 * Wrapper function to return a ib_mad_port_private structure or NULL
105 * for a device/port
106 */
107static inline struct ib_mad_port_private *
108ib_get_mad_port(struct ib_device *device, int port_num)
109{
110 struct ib_mad_port_private *entry;
111 unsigned long flags;
112
113 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
114 entry = __ib_get_mad_port(device, port_num);
115 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
116
117 return entry;
118}
119
120static inline u8 convert_mgmt_class(u8 mgmt_class)
121{
122 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
123 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
124 0 : mgmt_class;
125}
126
127static int get_spl_qp_index(enum ib_qp_type qp_type)
128{
129 switch (qp_type)
130 {
131 case IB_QPT_SMI:
132 return 0;
133 case IB_QPT_GSI:
134 return 1;
135 default:
136 return -1;
137 }
138}
139
140static int vendor_class_index(u8 mgmt_class)
141{
142 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
143}
144
145static int is_vendor_class(u8 mgmt_class)
146{
147 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
148 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
149 return 0;
150 return 1;
151}
152
153static int is_vendor_oui(char *oui)
154{
155 if (oui[0] || oui[1] || oui[2])
156 return 1;
157 return 0;
158}
159
160static int is_vendor_method_in_use(
161 struct ib_mad_mgmt_vendor_class *vendor_class,
162 struct ib_mad_reg_req *mad_reg_req)
163{
164 struct ib_mad_mgmt_method_table *method;
165 int i;
166
167 for (i = 0; i < MAX_MGMT_OUI; i++) {
168 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
169 method = vendor_class->method_table[i];
170 if (method) {
171 if (method_in_use(&method, mad_reg_req))
172 return 1;
173 else
174 break;
175 }
176 }
177 }
178 return 0;
179}
180
181int ib_response_mad(const struct ib_mad_hdr *hdr)
182{
183 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
184 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
185 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
186 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
187}
188EXPORT_SYMBOL(ib_response_mad);
189
190/*
191 * ib_register_mad_agent - Register to send/receive MADs
192 */
193struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
194 u8 port_num,
195 enum ib_qp_type qp_type,
196 struct ib_mad_reg_req *mad_reg_req,
197 u8 rmpp_version,
198 ib_mad_send_handler send_handler,
199 ib_mad_recv_handler recv_handler,
200 void *context,
201 u32 registration_flags)
202{
203 struct ib_mad_port_private *port_priv;
204 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
205 struct ib_mad_agent_private *mad_agent_priv;
206 struct ib_mad_reg_req *reg_req = NULL;
207 struct ib_mad_mgmt_class_table *class;
208 struct ib_mad_mgmt_vendor_class_table *vendor;
209 struct ib_mad_mgmt_vendor_class *vendor_class;
210 struct ib_mad_mgmt_method_table *method;
211 int ret2, qpn;
212 unsigned long flags;
213 u8 mgmt_class, vclass;
214
215 /* Validate parameters */
216 qpn = get_spl_qp_index(qp_type);
217 if (qpn == -1) {
218 dev_notice(&device->dev,
219 "ib_register_mad_agent: invalid QP Type %d\n",
220 qp_type);
221 goto error1;
222 }
223
224 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
225 dev_notice(&device->dev,
226 "ib_register_mad_agent: invalid RMPP Version %u\n",
227 rmpp_version);
228 goto error1;
229 }
230
231 /* Validate MAD registration request if supplied */
232 if (mad_reg_req) {
233 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
234 dev_notice(&device->dev,
235 "ib_register_mad_agent: invalid Class Version %u\n",
236 mad_reg_req->mgmt_class_version);
237 goto error1;
238 }
239 if (!recv_handler) {
240 dev_notice(&device->dev,
241 "ib_register_mad_agent: no recv_handler\n");
242 goto error1;
243 }
244 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
245 /*
246 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
247 * one in this range currently allowed
248 */
249 if (mad_reg_req->mgmt_class !=
250 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
251 dev_notice(&device->dev,
252 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
253 mad_reg_req->mgmt_class);
254 goto error1;
255 }
256 } else if (mad_reg_req->mgmt_class == 0) {
257 /*
258 * Class 0 is reserved in IBA and is used for
259 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
260 */
261 dev_notice(&device->dev,
262 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
263 goto error1;
264 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
265 /*
266 * If class is in "new" vendor range,
267 * ensure supplied OUI is not zero
268 */
269 if (!is_vendor_oui(mad_reg_req->oui)) {
270 dev_notice(&device->dev,
271 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
272 mad_reg_req->mgmt_class);
273 goto error1;
274 }
275 }
276 /* Make sure class supplied is consistent with RMPP */
277 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
278 if (rmpp_version) {
279 dev_notice(&device->dev,
280 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
281 mad_reg_req->mgmt_class);
282 goto error1;
283 }
284 }
285
286 /* Make sure class supplied is consistent with QP type */
287 if (qp_type == IB_QPT_SMI) {
288 if ((mad_reg_req->mgmt_class !=
289 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
290 (mad_reg_req->mgmt_class !=
291 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
292 dev_notice(&device->dev,
293 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
294 mad_reg_req->mgmt_class);
295 goto error1;
296 }
297 } else {
298 if ((mad_reg_req->mgmt_class ==
299 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
300 (mad_reg_req->mgmt_class ==
301 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
302 dev_notice(&device->dev,
303 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
304 mad_reg_req->mgmt_class);
305 goto error1;
306 }
307 }
308 } else {
309 /* No registration request supplied */
310 if (!send_handler)
311 goto error1;
312 if (registration_flags & IB_MAD_USER_RMPP)
313 goto error1;
314 }
315
316 /* Validate device and port */
317 port_priv = ib_get_mad_port(device, port_num);
318 if (!port_priv) {
319 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
320 ret = ERR_PTR(-ENODEV);
321 goto error1;
322 }
323
324 /* Verify the QP requested is supported. For example, Ethernet devices
325 * will not have QP0 */
326 if (!port_priv->qp_info[qpn].qp) {
327 dev_notice(&device->dev,
328 "ib_register_mad_agent: QP %d not supported\n", qpn);
329 ret = ERR_PTR(-EPROTONOSUPPORT);
330 goto error1;
331 }
332
333 /* Allocate structures */
334 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
335 if (!mad_agent_priv) {
336 ret = ERR_PTR(-ENOMEM);
337 goto error1;
338 }
339
340 if (mad_reg_req) {
341 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
342 if (!reg_req) {
343 ret = ERR_PTR(-ENOMEM);
344 goto error3;
345 }
346 }
347
348 /* Now, fill in the various structures */
349 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
350 mad_agent_priv->reg_req = reg_req;
351 mad_agent_priv->agent.rmpp_version = rmpp_version;
352 mad_agent_priv->agent.device = device;
353 mad_agent_priv->agent.recv_handler = recv_handler;
354 mad_agent_priv->agent.send_handler = send_handler;
355 mad_agent_priv->agent.context = context;
356 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
357 mad_agent_priv->agent.port_num = port_num;
358 mad_agent_priv->agent.flags = registration_flags;
359 spin_lock_init(&mad_agent_priv->lock);
360 INIT_LIST_HEAD(&mad_agent_priv->send_list);
361 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
362 INIT_LIST_HEAD(&mad_agent_priv->done_list);
363 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
364 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
365 INIT_LIST_HEAD(&mad_agent_priv->local_list);
366 INIT_WORK(&mad_agent_priv->local_work, local_completions);
367 atomic_set(&mad_agent_priv->refcount, 1);
368 init_completion(&mad_agent_priv->comp);
369
370 spin_lock_irqsave(&port_priv->reg_lock, flags);
371 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
372
373 /*
374 * Make sure MAD registration (if supplied)
375 * is non overlapping with any existing ones
376 */
377 if (mad_reg_req) {
378 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
379 if (!is_vendor_class(mgmt_class)) {
380 class = port_priv->version[mad_reg_req->
381 mgmt_class_version].class;
382 if (class) {
383 method = class->method_table[mgmt_class];
384 if (method) {
385 if (method_in_use(&method,
386 mad_reg_req))
387 goto error4;
388 }
389 }
390 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
391 mgmt_class);
392 } else {
393 /* "New" vendor class range */
394 vendor = port_priv->version[mad_reg_req->
395 mgmt_class_version].vendor;
396 if (vendor) {
397 vclass = vendor_class_index(mgmt_class);
398 vendor_class = vendor->vendor_class[vclass];
399 if (vendor_class) {
400 if (is_vendor_method_in_use(
401 vendor_class,
402 mad_reg_req))
403 goto error4;
404 }
405 }
406 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
407 }
408 if (ret2) {
409 ret = ERR_PTR(ret2);
410 goto error4;
411 }
412 }
413
414 /* Add mad agent into port's agent list */
415 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
416 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
417
418 return &mad_agent_priv->agent;
419
420error4:
421 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
422 kfree(reg_req);
423error3:
424 kfree(mad_agent_priv);
425error1:
426 return ret;
427}
428EXPORT_SYMBOL(ib_register_mad_agent);
429
430static inline int is_snooping_sends(int mad_snoop_flags)
431{
432 return (mad_snoop_flags &
433 (/*IB_MAD_SNOOP_POSTED_SENDS |
434 IB_MAD_SNOOP_RMPP_SENDS |*/
435 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
436 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
437}
438
439static inline int is_snooping_recvs(int mad_snoop_flags)
440{
441 return (mad_snoop_flags &
442 (IB_MAD_SNOOP_RECVS /*|
443 IB_MAD_SNOOP_RMPP_RECVS*/));
444}
445
446static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
447 struct ib_mad_snoop_private *mad_snoop_priv)
448{
449 struct ib_mad_snoop_private **new_snoop_table;
450 unsigned long flags;
451 int i;
452
453 spin_lock_irqsave(&qp_info->snoop_lock, flags);
454 /* Check for empty slot in array. */
455 for (i = 0; i < qp_info->snoop_table_size; i++)
456 if (!qp_info->snoop_table[i])
457 break;
458
459 if (i == qp_info->snoop_table_size) {
460 /* Grow table. */
461 new_snoop_table = krealloc(qp_info->snoop_table,
462 sizeof mad_snoop_priv *
463 (qp_info->snoop_table_size + 1),
464 GFP_ATOMIC);
465 if (!new_snoop_table) {
466 i = -ENOMEM;
467 goto out;
468 }
469
470 qp_info->snoop_table = new_snoop_table;
471 qp_info->snoop_table_size++;
472 }
473 qp_info->snoop_table[i] = mad_snoop_priv;
474 atomic_inc(&qp_info->snoop_count);
475out:
476 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
477 return i;
478}
479
480struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
481 u8 port_num,
482 enum ib_qp_type qp_type,
483 int mad_snoop_flags,
484 ib_mad_snoop_handler snoop_handler,
485 ib_mad_recv_handler recv_handler,
486 void *context)
487{
488 struct ib_mad_port_private *port_priv;
489 struct ib_mad_agent *ret;
490 struct ib_mad_snoop_private *mad_snoop_priv;
491 int qpn;
492
493 /* Validate parameters */
494 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
495 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
496 ret = ERR_PTR(-EINVAL);
497 goto error1;
498 }
499 qpn = get_spl_qp_index(qp_type);
500 if (qpn == -1) {
501 ret = ERR_PTR(-EINVAL);
502 goto error1;
503 }
504 port_priv = ib_get_mad_port(device, port_num);
505 if (!port_priv) {
506 ret = ERR_PTR(-ENODEV);
507 goto error1;
508 }
509 /* Allocate structures */
510 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
511 if (!mad_snoop_priv) {
512 ret = ERR_PTR(-ENOMEM);
513 goto error1;
514 }
515
516 /* Now, fill in the various structures */
517 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
518 mad_snoop_priv->agent.device = device;
519 mad_snoop_priv->agent.recv_handler = recv_handler;
520 mad_snoop_priv->agent.snoop_handler = snoop_handler;
521 mad_snoop_priv->agent.context = context;
522 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
523 mad_snoop_priv->agent.port_num = port_num;
524 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
525 init_completion(&mad_snoop_priv->comp);
526 mad_snoop_priv->snoop_index = register_snoop_agent(
527 &port_priv->qp_info[qpn],
528 mad_snoop_priv);
529 if (mad_snoop_priv->snoop_index < 0) {
530 ret = ERR_PTR(mad_snoop_priv->snoop_index);
531 goto error2;
532 }
533
534 atomic_set(&mad_snoop_priv->refcount, 1);
535 return &mad_snoop_priv->agent;
536
537error2:
538 kfree(mad_snoop_priv);
539error1:
540 return ret;
541}
542EXPORT_SYMBOL(ib_register_mad_snoop);
543
544static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
545{
546 if (atomic_dec_and_test(&mad_agent_priv->refcount))
547 complete(&mad_agent_priv->comp);
548}
549
550static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
551{
552 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
553 complete(&mad_snoop_priv->comp);
554}
555
556static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
557{
558 struct ib_mad_port_private *port_priv;
559 unsigned long flags;
560
561 /* Note that we could still be handling received MADs */
562
563 /*
564 * Canceling all sends results in dropping received response
565 * MADs, preventing us from queuing additional work
566 */
567 cancel_mads(mad_agent_priv);
568 port_priv = mad_agent_priv->qp_info->port_priv;
569 cancel_delayed_work(&mad_agent_priv->timed_work);
570
571 spin_lock_irqsave(&port_priv->reg_lock, flags);
572 remove_mad_reg_req(mad_agent_priv);
573 list_del(&mad_agent_priv->agent_list);
574 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
575
576 flush_workqueue(port_priv->wq);
577 ib_cancel_rmpp_recvs(mad_agent_priv);
578
579 deref_mad_agent(mad_agent_priv);
580 wait_for_completion(&mad_agent_priv->comp);
581
582 kfree(mad_agent_priv->reg_req);
583 kfree(mad_agent_priv);
584}
585
586static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
587{
588 struct ib_mad_qp_info *qp_info;
589 unsigned long flags;
590
591 qp_info = mad_snoop_priv->qp_info;
592 spin_lock_irqsave(&qp_info->snoop_lock, flags);
593 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
594 atomic_dec(&qp_info->snoop_count);
595 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
596
597 deref_snoop_agent(mad_snoop_priv);
598 wait_for_completion(&mad_snoop_priv->comp);
599
600 kfree(mad_snoop_priv);
601}
602
603/*
604 * ib_unregister_mad_agent - Unregisters a client from using MAD services
605 */
606int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
607{
608 struct ib_mad_agent_private *mad_agent_priv;
609 struct ib_mad_snoop_private *mad_snoop_priv;
610
611 /* If the TID is zero, the agent can only snoop. */
612 if (mad_agent->hi_tid) {
613 mad_agent_priv = container_of(mad_agent,
614 struct ib_mad_agent_private,
615 agent);
616 unregister_mad_agent(mad_agent_priv);
617 } else {
618 mad_snoop_priv = container_of(mad_agent,
619 struct ib_mad_snoop_private,
620 agent);
621 unregister_mad_snoop(mad_snoop_priv);
622 }
623 return 0;
624}
625EXPORT_SYMBOL(ib_unregister_mad_agent);
626
627static void dequeue_mad(struct ib_mad_list_head *mad_list)
628{
629 struct ib_mad_queue *mad_queue;
630 unsigned long flags;
631
632 BUG_ON(!mad_list->mad_queue);
633 mad_queue = mad_list->mad_queue;
634 spin_lock_irqsave(&mad_queue->lock, flags);
635 list_del(&mad_list->list);
636 mad_queue->count--;
637 spin_unlock_irqrestore(&mad_queue->lock, flags);
638}
639
640static void snoop_send(struct ib_mad_qp_info *qp_info,
641 struct ib_mad_send_buf *send_buf,
642 struct ib_mad_send_wc *mad_send_wc,
643 int mad_snoop_flags)
644{
645 struct ib_mad_snoop_private *mad_snoop_priv;
646 unsigned long flags;
647 int i;
648
649 spin_lock_irqsave(&qp_info->snoop_lock, flags);
650 for (i = 0; i < qp_info->snoop_table_size; i++) {
651 mad_snoop_priv = qp_info->snoop_table[i];
652 if (!mad_snoop_priv ||
653 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
654 continue;
655
656 atomic_inc(&mad_snoop_priv->refcount);
657 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
658 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
659 send_buf, mad_send_wc);
660 deref_snoop_agent(mad_snoop_priv);
661 spin_lock_irqsave(&qp_info->snoop_lock, flags);
662 }
663 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
664}
665
666static void snoop_recv(struct ib_mad_qp_info *qp_info,
667 struct ib_mad_recv_wc *mad_recv_wc,
668 int mad_snoop_flags)
669{
670 struct ib_mad_snoop_private *mad_snoop_priv;
671 unsigned long flags;
672 int i;
673
674 spin_lock_irqsave(&qp_info->snoop_lock, flags);
675 for (i = 0; i < qp_info->snoop_table_size; i++) {
676 mad_snoop_priv = qp_info->snoop_table[i];
677 if (!mad_snoop_priv ||
678 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
679 continue;
680
681 atomic_inc(&mad_snoop_priv->refcount);
682 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
683 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
684 mad_recv_wc);
685 deref_snoop_agent(mad_snoop_priv);
686 spin_lock_irqsave(&qp_info->snoop_lock, flags);
687 }
688 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
689}
690
691static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
692 u16 pkey_index, u8 port_num, struct ib_wc *wc)
693{
694 memset(wc, 0, sizeof *wc);
695 wc->wr_cqe = cqe;
696 wc->status = IB_WC_SUCCESS;
697 wc->opcode = IB_WC_RECV;
698 wc->pkey_index = pkey_index;
699 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
700 wc->src_qp = IB_QP0;
701 wc->qp = qp;
702 wc->slid = slid;
703 wc->sl = 0;
704 wc->dlid_path_bits = 0;
705 wc->port_num = port_num;
706}
707
708static size_t mad_priv_size(const struct ib_mad_private *mp)
709{
710 return sizeof(struct ib_mad_private) + mp->mad_size;
711}
712
713static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
714{
715 size_t size = sizeof(struct ib_mad_private) + mad_size;
716 struct ib_mad_private *ret = kzalloc(size, flags);
717
718 if (ret)
719 ret->mad_size = mad_size;
720
721 return ret;
722}
723
724static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
725{
726 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
727}
728
729static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
730{
731 return sizeof(struct ib_grh) + mp->mad_size;
732}
733
734/*
735 * Return 0 if SMP is to be sent
736 * Return 1 if SMP was consumed locally (whether or not solicited)
737 * Return < 0 if error
738 */
739static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
740 struct ib_mad_send_wr_private *mad_send_wr)
741{
742 int ret = 0;
743 struct ib_smp *smp = mad_send_wr->send_buf.mad;
744 struct opa_smp *opa_smp = (struct opa_smp *)smp;
745 unsigned long flags;
746 struct ib_mad_local_private *local;
747 struct ib_mad_private *mad_priv;
748 struct ib_mad_port_private *port_priv;
749 struct ib_mad_agent_private *recv_mad_agent = NULL;
750 struct ib_device *device = mad_agent_priv->agent.device;
751 u8 port_num;
752 struct ib_wc mad_wc;
753 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
754 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
755 u16 out_mad_pkey_index = 0;
756 u16 drslid;
757 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
758 mad_agent_priv->qp_info->port_priv->port_num);
759
760 if (rdma_cap_ib_switch(device) &&
761 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
762 port_num = send_wr->port_num;
763 else
764 port_num = mad_agent_priv->agent.port_num;
765
766 /*
767 * Directed route handling starts if the initial LID routed part of
768 * a request or the ending LID routed part of a response is empty.
769 * If we are at the start of the LID routed part, don't update the
770 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
771 */
772 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
773 u32 opa_drslid;
774
775 if ((opa_get_smp_direction(opa_smp)
776 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
777 OPA_LID_PERMISSIVE &&
778 opa_smi_handle_dr_smp_send(opa_smp,
779 rdma_cap_ib_switch(device),
780 port_num) == IB_SMI_DISCARD) {
781 ret = -EINVAL;
782 dev_err(&device->dev, "OPA Invalid directed route\n");
783 goto out;
784 }
785 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
786 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
787 opa_drslid & 0xffff0000) {
788 ret = -EINVAL;
789 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
790 opa_drslid);
791 goto out;
792 }
793 drslid = (u16)(opa_drslid & 0x0000ffff);
794
795 /* Check to post send on QP or process locally */
796 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
797 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
798 goto out;
799 } else {
800 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
801 IB_LID_PERMISSIVE &&
802 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
803 IB_SMI_DISCARD) {
804 ret = -EINVAL;
805 dev_err(&device->dev, "Invalid directed route\n");
806 goto out;
807 }
808 drslid = be16_to_cpu(smp->dr_slid);
809
810 /* Check to post send on QP or process locally */
811 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
812 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
813 goto out;
814 }
815
816 local = kmalloc(sizeof *local, GFP_ATOMIC);
817 if (!local) {
818 ret = -ENOMEM;
819 goto out;
820 }
821 local->mad_priv = NULL;
822 local->recv_mad_agent = NULL;
823 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
824 if (!mad_priv) {
825 ret = -ENOMEM;
826 kfree(local);
827 goto out;
828 }
829
830 build_smp_wc(mad_agent_priv->agent.qp,
831 send_wr->wr.wr_cqe, drslid,
832 send_wr->pkey_index,
833 send_wr->port_num, &mad_wc);
834
835 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
836 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
837 + mad_send_wr->send_buf.data_len
838 + sizeof(struct ib_grh);
839 }
840
841 /* No GRH for DR SMP */
842 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
843 (const struct ib_mad_hdr *)smp, mad_size,
844 (struct ib_mad_hdr *)mad_priv->mad,
845 &mad_size, &out_mad_pkey_index);
846 switch (ret)
847 {
848 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
849 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
850 mad_agent_priv->agent.recv_handler) {
851 local->mad_priv = mad_priv;
852 local->recv_mad_agent = mad_agent_priv;
853 /*
854 * Reference MAD agent until receive
855 * side of local completion handled
856 */
857 atomic_inc(&mad_agent_priv->refcount);
858 } else
859 kfree(mad_priv);
860 break;
861 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
862 kfree(mad_priv);
863 break;
864 case IB_MAD_RESULT_SUCCESS:
865 /* Treat like an incoming receive MAD */
866 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
867 mad_agent_priv->agent.port_num);
868 if (port_priv) {
869 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
870 recv_mad_agent = find_mad_agent(port_priv,
871 (const struct ib_mad_hdr *)mad_priv->mad);
872 }
873 if (!port_priv || !recv_mad_agent) {
874 /*
875 * No receiving agent so drop packet and
876 * generate send completion.
877 */
878 kfree(mad_priv);
879 break;
880 }
881 local->mad_priv = mad_priv;
882 local->recv_mad_agent = recv_mad_agent;
883 break;
884 default:
885 kfree(mad_priv);
886 kfree(local);
887 ret = -EINVAL;
888 goto out;
889 }
890
891 local->mad_send_wr = mad_send_wr;
892 if (opa) {
893 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
894 local->return_wc_byte_len = mad_size;
895 }
896 /* Reference MAD agent until send side of local completion handled */
897 atomic_inc(&mad_agent_priv->refcount);
898 /* Queue local completion to local list */
899 spin_lock_irqsave(&mad_agent_priv->lock, flags);
900 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
901 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
902 queue_work(mad_agent_priv->qp_info->port_priv->wq,
903 &mad_agent_priv->local_work);
904 ret = 1;
905out:
906 return ret;
907}
908
909static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
910{
911 int seg_size, pad;
912
913 seg_size = mad_size - hdr_len;
914 if (data_len && seg_size) {
915 pad = seg_size - data_len % seg_size;
916 return pad == seg_size ? 0 : pad;
917 } else
918 return seg_size;
919}
920
921static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
922{
923 struct ib_rmpp_segment *s, *t;
924
925 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
926 list_del(&s->list);
927 kfree(s);
928 }
929}
930
931static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
932 size_t mad_size, gfp_t gfp_mask)
933{
934 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
935 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
936 struct ib_rmpp_segment *seg = NULL;
937 int left, seg_size, pad;
938
939 send_buf->seg_size = mad_size - send_buf->hdr_len;
940 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
941 seg_size = send_buf->seg_size;
942 pad = send_wr->pad;
943
944 /* Allocate data segments. */
945 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
946 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
947 if (!seg) {
948 free_send_rmpp_list(send_wr);
949 return -ENOMEM;
950 }
951 seg->num = ++send_buf->seg_count;
952 list_add_tail(&seg->list, &send_wr->rmpp_list);
953 }
954
955 /* Zero any padding */
956 if (pad)
957 memset(seg->data + seg_size - pad, 0, pad);
958
959 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
960 agent.rmpp_version;
961 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
962 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
963
964 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
965 struct ib_rmpp_segment, list);
966 send_wr->last_ack_seg = send_wr->cur_seg;
967 return 0;
968}
969
970int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
971{
972 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
973}
974EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
975
976struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
977 u32 remote_qpn, u16 pkey_index,
978 int rmpp_active,
979 int hdr_len, int data_len,
980 gfp_t gfp_mask,
981 u8 base_version)
982{
983 struct ib_mad_agent_private *mad_agent_priv;
984 struct ib_mad_send_wr_private *mad_send_wr;
985 int pad, message_size, ret, size;
986 void *buf;
987 size_t mad_size;
988 bool opa;
989
990 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
991 agent);
992
993 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
994
995 if (opa && base_version == OPA_MGMT_BASE_VERSION)
996 mad_size = sizeof(struct opa_mad);
997 else
998 mad_size = sizeof(struct ib_mad);
999
1000 pad = get_pad_size(hdr_len, data_len, mad_size);
1001 message_size = hdr_len + data_len + pad;
1002
1003 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1004 if (!rmpp_active && message_size > mad_size)
1005 return ERR_PTR(-EINVAL);
1006 } else
1007 if (rmpp_active || message_size > mad_size)
1008 return ERR_PTR(-EINVAL);
1009
1010 size = rmpp_active ? hdr_len : mad_size;
1011 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1012 if (!buf)
1013 return ERR_PTR(-ENOMEM);
1014
1015 mad_send_wr = buf + size;
1016 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1017 mad_send_wr->send_buf.mad = buf;
1018 mad_send_wr->send_buf.hdr_len = hdr_len;
1019 mad_send_wr->send_buf.data_len = data_len;
1020 mad_send_wr->pad = pad;
1021
1022 mad_send_wr->mad_agent_priv = mad_agent_priv;
1023 mad_send_wr->sg_list[0].length = hdr_len;
1024 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1025
1026 /* OPA MADs don't have to be the full 2048 bytes */
1027 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1028 data_len < mad_size - hdr_len)
1029 mad_send_wr->sg_list[1].length = data_len;
1030 else
1031 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1032
1033 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1034
1035 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1036
1037 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1038 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1039 mad_send_wr->send_wr.wr.num_sge = 2;
1040 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1041 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1042 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1043 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1044 mad_send_wr->send_wr.pkey_index = pkey_index;
1045
1046 if (rmpp_active) {
1047 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1048 if (ret) {
1049 kfree(buf);
1050 return ERR_PTR(ret);
1051 }
1052 }
1053
1054 mad_send_wr->send_buf.mad_agent = mad_agent;
1055 atomic_inc(&mad_agent_priv->refcount);
1056 return &mad_send_wr->send_buf;
1057}
1058EXPORT_SYMBOL(ib_create_send_mad);
1059
1060int ib_get_mad_data_offset(u8 mgmt_class)
1061{
1062 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1063 return IB_MGMT_SA_HDR;
1064 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1065 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1066 (mgmt_class == IB_MGMT_CLASS_BIS))
1067 return IB_MGMT_DEVICE_HDR;
1068 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1069 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1070 return IB_MGMT_VENDOR_HDR;
1071 else
1072 return IB_MGMT_MAD_HDR;
1073}
1074EXPORT_SYMBOL(ib_get_mad_data_offset);
1075
1076int ib_is_mad_class_rmpp(u8 mgmt_class)
1077{
1078 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1079 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1080 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1081 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1082 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1083 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1084 return 1;
1085 return 0;
1086}
1087EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1088
1089void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1090{
1091 struct ib_mad_send_wr_private *mad_send_wr;
1092 struct list_head *list;
1093
1094 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1095 send_buf);
1096 list = &mad_send_wr->cur_seg->list;
1097
1098 if (mad_send_wr->cur_seg->num < seg_num) {
1099 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1100 if (mad_send_wr->cur_seg->num == seg_num)
1101 break;
1102 } else if (mad_send_wr->cur_seg->num > seg_num) {
1103 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1104 if (mad_send_wr->cur_seg->num == seg_num)
1105 break;
1106 }
1107 return mad_send_wr->cur_seg->data;
1108}
1109EXPORT_SYMBOL(ib_get_rmpp_segment);
1110
1111static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1112{
1113 if (mad_send_wr->send_buf.seg_count)
1114 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1115 mad_send_wr->seg_num);
1116 else
1117 return mad_send_wr->send_buf.mad +
1118 mad_send_wr->send_buf.hdr_len;
1119}
1120
1121void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1122{
1123 struct ib_mad_agent_private *mad_agent_priv;
1124 struct ib_mad_send_wr_private *mad_send_wr;
1125
1126 mad_agent_priv = container_of(send_buf->mad_agent,
1127 struct ib_mad_agent_private, agent);
1128 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1129 send_buf);
1130
1131 free_send_rmpp_list(mad_send_wr);
1132 kfree(send_buf->mad);
1133 deref_mad_agent(mad_agent_priv);
1134}
1135EXPORT_SYMBOL(ib_free_send_mad);
1136
1137int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1138{
1139 struct ib_mad_qp_info *qp_info;
1140 struct list_head *list;
1141 struct ib_send_wr *bad_send_wr;
1142 struct ib_mad_agent *mad_agent;
1143 struct ib_sge *sge;
1144 unsigned long flags;
1145 int ret;
1146
1147 /* Set WR ID to find mad_send_wr upon completion */
1148 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1149 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1150 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1151 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1152
1153 mad_agent = mad_send_wr->send_buf.mad_agent;
1154 sge = mad_send_wr->sg_list;
1155 sge[0].addr = ib_dma_map_single(mad_agent->device,
1156 mad_send_wr->send_buf.mad,
1157 sge[0].length,
1158 DMA_TO_DEVICE);
1159 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1160 return -ENOMEM;
1161
1162 mad_send_wr->header_mapping = sge[0].addr;
1163
1164 sge[1].addr = ib_dma_map_single(mad_agent->device,
1165 ib_get_payload(mad_send_wr),
1166 sge[1].length,
1167 DMA_TO_DEVICE);
1168 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1169 ib_dma_unmap_single(mad_agent->device,
1170 mad_send_wr->header_mapping,
1171 sge[0].length, DMA_TO_DEVICE);
1172 return -ENOMEM;
1173 }
1174 mad_send_wr->payload_mapping = sge[1].addr;
1175
1176 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1177 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1178 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1179 &bad_send_wr);
1180 list = &qp_info->send_queue.list;
1181 } else {
1182 ret = 0;
1183 list = &qp_info->overflow_list;
1184 }
1185
1186 if (!ret) {
1187 qp_info->send_queue.count++;
1188 list_add_tail(&mad_send_wr->mad_list.list, list);
1189 }
1190 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1191 if (ret) {
1192 ib_dma_unmap_single(mad_agent->device,
1193 mad_send_wr->header_mapping,
1194 sge[0].length, DMA_TO_DEVICE);
1195 ib_dma_unmap_single(mad_agent->device,
1196 mad_send_wr->payload_mapping,
1197 sge[1].length, DMA_TO_DEVICE);
1198 }
1199 return ret;
1200}
1201
1202/*
1203 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1204 * with the registered client
1205 */
1206int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1207 struct ib_mad_send_buf **bad_send_buf)
1208{
1209 struct ib_mad_agent_private *mad_agent_priv;
1210 struct ib_mad_send_buf *next_send_buf;
1211 struct ib_mad_send_wr_private *mad_send_wr;
1212 unsigned long flags;
1213 int ret = -EINVAL;
1214
1215 /* Walk list of send WRs and post each on send list */
1216 for (; send_buf; send_buf = next_send_buf) {
1217
1218 mad_send_wr = container_of(send_buf,
1219 struct ib_mad_send_wr_private,
1220 send_buf);
1221 mad_agent_priv = mad_send_wr->mad_agent_priv;
1222
1223 if (!send_buf->mad_agent->send_handler ||
1224 (send_buf->timeout_ms &&
1225 !send_buf->mad_agent->recv_handler)) {
1226 ret = -EINVAL;
1227 goto error;
1228 }
1229
1230 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1231 if (mad_agent_priv->agent.rmpp_version) {
1232 ret = -EINVAL;
1233 goto error;
1234 }
1235 }
1236
1237 /*
1238 * Save pointer to next work request to post in case the
1239 * current one completes, and the user modifies the work
1240 * request associated with the completion
1241 */
1242 next_send_buf = send_buf->next;
1243 mad_send_wr->send_wr.ah = send_buf->ah;
1244
1245 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1246 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1247 ret = handle_outgoing_dr_smp(mad_agent_priv,
1248 mad_send_wr);
1249 if (ret < 0) /* error */
1250 goto error;
1251 else if (ret == 1) /* locally consumed */
1252 continue;
1253 }
1254
1255 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1256 /* Timeout will be updated after send completes */
1257 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1258 mad_send_wr->max_retries = send_buf->retries;
1259 mad_send_wr->retries_left = send_buf->retries;
1260 send_buf->retries = 0;
1261 /* Reference for work request to QP + response */
1262 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1263 mad_send_wr->status = IB_WC_SUCCESS;
1264
1265 /* Reference MAD agent until send completes */
1266 atomic_inc(&mad_agent_priv->refcount);
1267 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1268 list_add_tail(&mad_send_wr->agent_list,
1269 &mad_agent_priv->send_list);
1270 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1271
1272 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1273 ret = ib_send_rmpp_mad(mad_send_wr);
1274 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1275 ret = ib_send_mad(mad_send_wr);
1276 } else
1277 ret = ib_send_mad(mad_send_wr);
1278 if (ret < 0) {
1279 /* Fail send request */
1280 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1281 list_del(&mad_send_wr->agent_list);
1282 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1283 atomic_dec(&mad_agent_priv->refcount);
1284 goto error;
1285 }
1286 }
1287 return 0;
1288error:
1289 if (bad_send_buf)
1290 *bad_send_buf = send_buf;
1291 return ret;
1292}
1293EXPORT_SYMBOL(ib_post_send_mad);
1294
1295/*
1296 * ib_free_recv_mad - Returns data buffers used to receive
1297 * a MAD to the access layer
1298 */
1299void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1300{
1301 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1302 struct ib_mad_private_header *mad_priv_hdr;
1303 struct ib_mad_private *priv;
1304 struct list_head free_list;
1305
1306 INIT_LIST_HEAD(&free_list);
1307 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1308
1309 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1310 &free_list, list) {
1311 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1312 recv_buf);
1313 mad_priv_hdr = container_of(mad_recv_wc,
1314 struct ib_mad_private_header,
1315 recv_wc);
1316 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1317 header);
1318 kfree(priv);
1319 }
1320}
1321EXPORT_SYMBOL(ib_free_recv_mad);
1322
1323struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1324 u8 rmpp_version,
1325 ib_mad_send_handler send_handler,
1326 ib_mad_recv_handler recv_handler,
1327 void *context)
1328{
1329 return ERR_PTR(-EINVAL); /* XXX: for now */
1330}
1331EXPORT_SYMBOL(ib_redirect_mad_qp);
1332
1333int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1334 struct ib_wc *wc)
1335{
1336 dev_err(&mad_agent->device->dev,
1337 "ib_process_mad_wc() not implemented yet\n");
1338 return 0;
1339}
1340EXPORT_SYMBOL(ib_process_mad_wc);
1341
1342static int method_in_use(struct ib_mad_mgmt_method_table **method,
1343 struct ib_mad_reg_req *mad_reg_req)
1344{
1345 int i;
1346
1347 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1348 if ((*method)->agent[i]) {
1349 pr_err("Method %d already in use\n", i);
1350 return -EINVAL;
1351 }
1352 }
1353 return 0;
1354}
1355
1356static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1357{
1358 /* Allocate management method table */
1359 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1360 return (*method) ? 0 : (-ENOMEM);
1361}
1362
1363/*
1364 * Check to see if there are any methods still in use
1365 */
1366static int check_method_table(struct ib_mad_mgmt_method_table *method)
1367{
1368 int i;
1369
1370 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1371 if (method->agent[i])
1372 return 1;
1373 return 0;
1374}
1375
1376/*
1377 * Check to see if there are any method tables for this class still in use
1378 */
1379static int check_class_table(struct ib_mad_mgmt_class_table *class)
1380{
1381 int i;
1382
1383 for (i = 0; i < MAX_MGMT_CLASS; i++)
1384 if (class->method_table[i])
1385 return 1;
1386 return 0;
1387}
1388
1389static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1390{
1391 int i;
1392
1393 for (i = 0; i < MAX_MGMT_OUI; i++)
1394 if (vendor_class->method_table[i])
1395 return 1;
1396 return 0;
1397}
1398
1399static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1400 const char *oui)
1401{
1402 int i;
1403
1404 for (i = 0; i < MAX_MGMT_OUI; i++)
1405 /* Is there matching OUI for this vendor class ? */
1406 if (!memcmp(vendor_class->oui[i], oui, 3))
1407 return i;
1408
1409 return -1;
1410}
1411
1412static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1413{
1414 int i;
1415
1416 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1417 if (vendor->vendor_class[i])
1418 return 1;
1419
1420 return 0;
1421}
1422
1423static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1424 struct ib_mad_agent_private *agent)
1425{
1426 int i;
1427
1428 /* Remove any methods for this mad agent */
1429 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1430 if (method->agent[i] == agent) {
1431 method->agent[i] = NULL;
1432 }
1433 }
1434}
1435
1436static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1437 struct ib_mad_agent_private *agent_priv,
1438 u8 mgmt_class)
1439{
1440 struct ib_mad_port_private *port_priv;
1441 struct ib_mad_mgmt_class_table **class;
1442 struct ib_mad_mgmt_method_table **method;
1443 int i, ret;
1444
1445 port_priv = agent_priv->qp_info->port_priv;
1446 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1447 if (!*class) {
1448 /* Allocate management class table for "new" class version */
1449 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1450 if (!*class) {
1451 ret = -ENOMEM;
1452 goto error1;
1453 }
1454
1455 /* Allocate method table for this management class */
1456 method = &(*class)->method_table[mgmt_class];
1457 if ((ret = allocate_method_table(method)))
1458 goto error2;
1459 } else {
1460 method = &(*class)->method_table[mgmt_class];
1461 if (!*method) {
1462 /* Allocate method table for this management class */
1463 if ((ret = allocate_method_table(method)))
1464 goto error1;
1465 }
1466 }
1467
1468 /* Now, make sure methods are not already in use */
1469 if (method_in_use(method, mad_reg_req))
1470 goto error3;
1471
1472 /* Finally, add in methods being registered */
1473 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1474 (*method)->agent[i] = agent_priv;
1475
1476 return 0;
1477
1478error3:
1479 /* Remove any methods for this mad agent */
1480 remove_methods_mad_agent(*method, agent_priv);
1481 /* Now, check to see if there are any methods in use */
1482 if (!check_method_table(*method)) {
1483 /* If not, release management method table */
1484 kfree(*method);
1485 *method = NULL;
1486 }
1487 ret = -EINVAL;
1488 goto error1;
1489error2:
1490 kfree(*class);
1491 *class = NULL;
1492error1:
1493 return ret;
1494}
1495
1496static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1497 struct ib_mad_agent_private *agent_priv)
1498{
1499 struct ib_mad_port_private *port_priv;
1500 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1501 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1502 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1503 struct ib_mad_mgmt_method_table **method;
1504 int i, ret = -ENOMEM;
1505 u8 vclass;
1506
1507 /* "New" vendor (with OUI) class */
1508 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1509 port_priv = agent_priv->qp_info->port_priv;
1510 vendor_table = &port_priv->version[
1511 mad_reg_req->mgmt_class_version].vendor;
1512 if (!*vendor_table) {
1513 /* Allocate mgmt vendor class table for "new" class version */
1514 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1515 if (!vendor)
1516 goto error1;
1517
1518 *vendor_table = vendor;
1519 }
1520 if (!(*vendor_table)->vendor_class[vclass]) {
1521 /* Allocate table for this management vendor class */
1522 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1523 if (!vendor_class)
1524 goto error2;
1525
1526 (*vendor_table)->vendor_class[vclass] = vendor_class;
1527 }
1528 for (i = 0; i < MAX_MGMT_OUI; i++) {
1529 /* Is there matching OUI for this vendor class ? */
1530 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1531 mad_reg_req->oui, 3)) {
1532 method = &(*vendor_table)->vendor_class[
1533 vclass]->method_table[i];
1534 BUG_ON(!*method);
1535 goto check_in_use;
1536 }
1537 }
1538 for (i = 0; i < MAX_MGMT_OUI; i++) {
1539 /* OUI slot available ? */
1540 if (!is_vendor_oui((*vendor_table)->vendor_class[
1541 vclass]->oui[i])) {
1542 method = &(*vendor_table)->vendor_class[
1543 vclass]->method_table[i];
1544 BUG_ON(*method);
1545 /* Allocate method table for this OUI */
1546 if ((ret = allocate_method_table(method)))
1547 goto error3;
1548 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1549 mad_reg_req->oui, 3);
1550 goto check_in_use;
1551 }
1552 }
1553 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1554 goto error3;
1555
1556check_in_use:
1557 /* Now, make sure methods are not already in use */
1558 if (method_in_use(method, mad_reg_req))
1559 goto error4;
1560
1561 /* Finally, add in methods being registered */
1562 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1563 (*method)->agent[i] = agent_priv;
1564
1565 return 0;
1566
1567error4:
1568 /* Remove any methods for this mad agent */
1569 remove_methods_mad_agent(*method, agent_priv);
1570 /* Now, check to see if there are any methods in use */
1571 if (!check_method_table(*method)) {
1572 /* If not, release management method table */
1573 kfree(*method);
1574 *method = NULL;
1575 }
1576 ret = -EINVAL;
1577error3:
1578 if (vendor_class) {
1579 (*vendor_table)->vendor_class[vclass] = NULL;
1580 kfree(vendor_class);
1581 }
1582error2:
1583 if (vendor) {
1584 *vendor_table = NULL;
1585 kfree(vendor);
1586 }
1587error1:
1588 return ret;
1589}
1590
1591static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1592{
1593 struct ib_mad_port_private *port_priv;
1594 struct ib_mad_mgmt_class_table *class;
1595 struct ib_mad_mgmt_method_table *method;
1596 struct ib_mad_mgmt_vendor_class_table *vendor;
1597 struct ib_mad_mgmt_vendor_class *vendor_class;
1598 int index;
1599 u8 mgmt_class;
1600
1601 /*
1602 * Was MAD registration request supplied
1603 * with original registration ?
1604 */
1605 if (!agent_priv->reg_req) {
1606 goto out;
1607 }
1608
1609 port_priv = agent_priv->qp_info->port_priv;
1610 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1611 class = port_priv->version[
1612 agent_priv->reg_req->mgmt_class_version].class;
1613 if (!class)
1614 goto vendor_check;
1615
1616 method = class->method_table[mgmt_class];
1617 if (method) {
1618 /* Remove any methods for this mad agent */
1619 remove_methods_mad_agent(method, agent_priv);
1620 /* Now, check to see if there are any methods still in use */
1621 if (!check_method_table(method)) {
1622 /* If not, release management method table */
1623 kfree(method);
1624 class->method_table[mgmt_class] = NULL;
1625 /* Any management classes left ? */
1626 if (!check_class_table(class)) {
1627 /* If not, release management class table */
1628 kfree(class);
1629 port_priv->version[
1630 agent_priv->reg_req->
1631 mgmt_class_version].class = NULL;
1632 }
1633 }
1634 }
1635
1636vendor_check:
1637 if (!is_vendor_class(mgmt_class))
1638 goto out;
1639
1640 /* normalize mgmt_class to vendor range 2 */
1641 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1642 vendor = port_priv->version[
1643 agent_priv->reg_req->mgmt_class_version].vendor;
1644
1645 if (!vendor)
1646 goto out;
1647
1648 vendor_class = vendor->vendor_class[mgmt_class];
1649 if (vendor_class) {
1650 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1651 if (index < 0)
1652 goto out;
1653 method = vendor_class->method_table[index];
1654 if (method) {
1655 /* Remove any methods for this mad agent */
1656 remove_methods_mad_agent(method, agent_priv);
1657 /*
1658 * Now, check to see if there are
1659 * any methods still in use
1660 */
1661 if (!check_method_table(method)) {
1662 /* If not, release management method table */
1663 kfree(method);
1664 vendor_class->method_table[index] = NULL;
1665 memset(vendor_class->oui[index], 0, 3);
1666 /* Any OUIs left ? */
1667 if (!check_vendor_class(vendor_class)) {
1668 /* If not, release vendor class table */
1669 kfree(vendor_class);
1670 vendor->vendor_class[mgmt_class] = NULL;
1671 /* Any other vendor classes left ? */
1672 if (!check_vendor_table(vendor)) {
1673 kfree(vendor);
1674 port_priv->version[
1675 agent_priv->reg_req->
1676 mgmt_class_version].
1677 vendor = NULL;
1678 }
1679 }
1680 }
1681 }
1682 }
1683
1684out:
1685 return;
1686}
1687
1688static struct ib_mad_agent_private *
1689find_mad_agent(struct ib_mad_port_private *port_priv,
1690 const struct ib_mad_hdr *mad_hdr)
1691{
1692 struct ib_mad_agent_private *mad_agent = NULL;
1693 unsigned long flags;
1694
1695 spin_lock_irqsave(&port_priv->reg_lock, flags);
1696 if (ib_response_mad(mad_hdr)) {
1697 u32 hi_tid;
1698 struct ib_mad_agent_private *entry;
1699
1700 /*
1701 * Routing is based on high 32 bits of transaction ID
1702 * of MAD.
1703 */
1704 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1705 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1706 if (entry->agent.hi_tid == hi_tid) {
1707 mad_agent = entry;
1708 break;
1709 }
1710 }
1711 } else {
1712 struct ib_mad_mgmt_class_table *class;
1713 struct ib_mad_mgmt_method_table *method;
1714 struct ib_mad_mgmt_vendor_class_table *vendor;
1715 struct ib_mad_mgmt_vendor_class *vendor_class;
1716 const struct ib_vendor_mad *vendor_mad;
1717 int index;
1718
1719 /*
1720 * Routing is based on version, class, and method
1721 * For "newer" vendor MADs, also based on OUI
1722 */
1723 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1724 goto out;
1725 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1726 class = port_priv->version[
1727 mad_hdr->class_version].class;
1728 if (!class)
1729 goto out;
1730 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1731 ARRAY_SIZE(class->method_table))
1732 goto out;
1733 method = class->method_table[convert_mgmt_class(
1734 mad_hdr->mgmt_class)];
1735 if (method)
1736 mad_agent = method->agent[mad_hdr->method &
1737 ~IB_MGMT_METHOD_RESP];
1738 } else {
1739 vendor = port_priv->version[
1740 mad_hdr->class_version].vendor;
1741 if (!vendor)
1742 goto out;
1743 vendor_class = vendor->vendor_class[vendor_class_index(
1744 mad_hdr->mgmt_class)];
1745 if (!vendor_class)
1746 goto out;
1747 /* Find matching OUI */
1748 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1749 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1750 if (index == -1)
1751 goto out;
1752 method = vendor_class->method_table[index];
1753 if (method) {
1754 mad_agent = method->agent[mad_hdr->method &
1755 ~IB_MGMT_METHOD_RESP];
1756 }
1757 }
1758 }
1759
1760 if (mad_agent) {
1761 if (mad_agent->agent.recv_handler)
1762 atomic_inc(&mad_agent->refcount);
1763 else {
1764 dev_notice(&port_priv->device->dev,
1765 "No receive handler for client %p on port %d\n",
1766 &mad_agent->agent, port_priv->port_num);
1767 mad_agent = NULL;
1768 }
1769 }
1770out:
1771 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1772
1773 return mad_agent;
1774}
1775
1776static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1777 const struct ib_mad_qp_info *qp_info,
1778 bool opa)
1779{
1780 int valid = 0;
1781 u32 qp_num = qp_info->qp->qp_num;
1782
1783 /* Make sure MAD base version is understood */
1784 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1785 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1786 pr_err("MAD received with unsupported base version %d %s\n",
1787 mad_hdr->base_version, opa ? "(opa)" : "");
1788 goto out;
1789 }
1790
1791 /* Filter SMI packets sent to other than QP0 */
1792 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1793 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1794 if (qp_num == 0)
1795 valid = 1;
1796 } else {
1797 /* CM attributes other than ClassPortInfo only use Send method */
1798 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1799 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1800 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1801 goto out;
1802 /* Filter GSI packets sent to QP0 */
1803 if (qp_num != 0)
1804 valid = 1;
1805 }
1806
1807out:
1808 return valid;
1809}
1810
1811static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1812 const struct ib_mad_hdr *mad_hdr)
1813{
1814 struct ib_rmpp_mad *rmpp_mad;
1815
1816 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1817 return !mad_agent_priv->agent.rmpp_version ||
1818 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1819 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1820 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1821 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1822}
1823
1824static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1825 const struct ib_mad_recv_wc *rwc)
1826{
1827 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1828 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1829}
1830
1831static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1832 const struct ib_mad_send_wr_private *wr,
1833 const struct ib_mad_recv_wc *rwc )
1834{
1835 struct ib_ah_attr attr;
1836 u8 send_resp, rcv_resp;
1837 union ib_gid sgid;
1838 struct ib_device *device = mad_agent_priv->agent.device;
1839 u8 port_num = mad_agent_priv->agent.port_num;
1840 u8 lmc;
1841
1842 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1843 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1844
1845 if (send_resp == rcv_resp)
1846 /* both requests, or both responses. GIDs different */
1847 return 0;
1848
1849 if (ib_query_ah(wr->send_buf.ah, &attr))
1850 /* Assume not equal, to avoid false positives. */
1851 return 0;
1852
1853 if (!!(attr.ah_flags & IB_AH_GRH) !=
1854 !!(rwc->wc->wc_flags & IB_WC_GRH))
1855 /* one has GID, other does not. Assume different */
1856 return 0;
1857
1858 if (!send_resp && rcv_resp) {
1859 /* is request/response. */
1860 if (!(attr.ah_flags & IB_AH_GRH)) {
1861 if (ib_get_cached_lmc(device, port_num, &lmc))
1862 return 0;
1863 return (!lmc || !((attr.src_path_bits ^
1864 rwc->wc->dlid_path_bits) &
1865 ((1 << lmc) - 1)));
1866 } else {
1867 if (ib_get_cached_gid(device, port_num,
1868 attr.grh.sgid_index, &sgid, NULL))
1869 return 0;
1870 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1871 16);
1872 }
1873 }
1874
1875 if (!(attr.ah_flags & IB_AH_GRH))
1876 return attr.dlid == rwc->wc->slid;
1877 else
1878 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1879 16);
1880}
1881
1882static inline int is_direct(u8 class)
1883{
1884 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1885}
1886
1887struct ib_mad_send_wr_private*
1888ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1889 const struct ib_mad_recv_wc *wc)
1890{
1891 struct ib_mad_send_wr_private *wr;
1892 const struct ib_mad_hdr *mad_hdr;
1893
1894 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1895
1896 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1897 if ((wr->tid == mad_hdr->tid) &&
1898 rcv_has_same_class(wr, wc) &&
1899 /*
1900 * Don't check GID for direct routed MADs.
1901 * These might have permissive LIDs.
1902 */
1903 (is_direct(mad_hdr->mgmt_class) ||
1904 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1905 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1906 }
1907
1908 /*
1909 * It's possible to receive the response before we've
1910 * been notified that the send has completed
1911 */
1912 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1913 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1914 wr->tid == mad_hdr->tid &&
1915 wr->timeout &&
1916 rcv_has_same_class(wr, wc) &&
1917 /*
1918 * Don't check GID for direct routed MADs.
1919 * These might have permissive LIDs.
1920 */
1921 (is_direct(mad_hdr->mgmt_class) ||
1922 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1923 /* Verify request has not been canceled */
1924 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1925 }
1926 return NULL;
1927}
1928
1929void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1930{
1931 mad_send_wr->timeout = 0;
1932 if (mad_send_wr->refcount == 1)
1933 list_move_tail(&mad_send_wr->agent_list,
1934 &mad_send_wr->mad_agent_priv->done_list);
1935}
1936
1937static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1938 struct ib_mad_recv_wc *mad_recv_wc)
1939{
1940 struct ib_mad_send_wr_private *mad_send_wr;
1941 struct ib_mad_send_wc mad_send_wc;
1942 unsigned long flags;
1943
1944 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1945 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1946 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1947 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1948 mad_recv_wc);
1949 if (!mad_recv_wc) {
1950 deref_mad_agent(mad_agent_priv);
1951 return;
1952 }
1953 }
1954
1955 /* Complete corresponding request */
1956 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1957 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1958 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1959 if (!mad_send_wr) {
1960 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1961 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1962 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1963 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1964 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1965 /* user rmpp is in effect
1966 * and this is an active RMPP MAD
1967 */
1968 mad_agent_priv->agent.recv_handler(
1969 &mad_agent_priv->agent, NULL,
1970 mad_recv_wc);
1971 atomic_dec(&mad_agent_priv->refcount);
1972 } else {
1973 /* not user rmpp, revert to normal behavior and
1974 * drop the mad */
1975 ib_free_recv_mad(mad_recv_wc);
1976 deref_mad_agent(mad_agent_priv);
1977 return;
1978 }
1979 } else {
1980 ib_mark_mad_done(mad_send_wr);
1981 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1982
1983 /* Defined behavior is to complete response before request */
1984 mad_agent_priv->agent.recv_handler(
1985 &mad_agent_priv->agent,
1986 &mad_send_wr->send_buf,
1987 mad_recv_wc);
1988 atomic_dec(&mad_agent_priv->refcount);
1989
1990 mad_send_wc.status = IB_WC_SUCCESS;
1991 mad_send_wc.vendor_err = 0;
1992 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1993 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1994 }
1995 } else {
1996 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
1997 mad_recv_wc);
1998 deref_mad_agent(mad_agent_priv);
1999 }
2000}
2001
2002static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2003 const struct ib_mad_qp_info *qp_info,
2004 const struct ib_wc *wc,
2005 int port_num,
2006 struct ib_mad_private *recv,
2007 struct ib_mad_private *response)
2008{
2009 enum smi_forward_action retsmi;
2010 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2011
2012 if (smi_handle_dr_smp_recv(smp,
2013 rdma_cap_ib_switch(port_priv->device),
2014 port_num,
2015 port_priv->device->phys_port_cnt) ==
2016 IB_SMI_DISCARD)
2017 return IB_SMI_DISCARD;
2018
2019 retsmi = smi_check_forward_dr_smp(smp);
2020 if (retsmi == IB_SMI_LOCAL)
2021 return IB_SMI_HANDLE;
2022
2023 if (retsmi == IB_SMI_SEND) { /* don't forward */
2024 if (smi_handle_dr_smp_send(smp,
2025 rdma_cap_ib_switch(port_priv->device),
2026 port_num) == IB_SMI_DISCARD)
2027 return IB_SMI_DISCARD;
2028
2029 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2030 return IB_SMI_DISCARD;
2031 } else if (rdma_cap_ib_switch(port_priv->device)) {
2032 /* forward case for switches */
2033 memcpy(response, recv, mad_priv_size(response));
2034 response->header.recv_wc.wc = &response->header.wc;
2035 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2036 response->header.recv_wc.recv_buf.grh = &response->grh;
2037
2038 agent_send_response((const struct ib_mad_hdr *)response->mad,
2039 &response->grh, wc,
2040 port_priv->device,
2041 smi_get_fwd_port(smp),
2042 qp_info->qp->qp_num,
2043 response->mad_size,
2044 false);
2045
2046 return IB_SMI_DISCARD;
2047 }
2048 return IB_SMI_HANDLE;
2049}
2050
2051static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2052 struct ib_mad_private *response,
2053 size_t *resp_len, bool opa)
2054{
2055 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2056 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2057
2058 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2059 recv_hdr->method == IB_MGMT_METHOD_SET) {
2060 memcpy(response, recv, mad_priv_size(response));
2061 response->header.recv_wc.wc = &response->header.wc;
2062 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2063 response->header.recv_wc.recv_buf.grh = &response->grh;
2064 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2065 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2066 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2067 resp_hdr->status |= IB_SMP_DIRECTION;
2068
2069 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2070 if (recv_hdr->mgmt_class ==
2071 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2072 recv_hdr->mgmt_class ==
2073 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2074 *resp_len = opa_get_smp_header_size(
2075 (struct opa_smp *)recv->mad);
2076 else
2077 *resp_len = sizeof(struct ib_mad_hdr);
2078 }
2079
2080 return true;
2081 } else {
2082 return false;
2083 }
2084}
2085
2086static enum smi_action
2087handle_opa_smi(struct ib_mad_port_private *port_priv,
2088 struct ib_mad_qp_info *qp_info,
2089 struct ib_wc *wc,
2090 int port_num,
2091 struct ib_mad_private *recv,
2092 struct ib_mad_private *response)
2093{
2094 enum smi_forward_action retsmi;
2095 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2096
2097 if (opa_smi_handle_dr_smp_recv(smp,
2098 rdma_cap_ib_switch(port_priv->device),
2099 port_num,
2100 port_priv->device->phys_port_cnt) ==
2101 IB_SMI_DISCARD)
2102 return IB_SMI_DISCARD;
2103
2104 retsmi = opa_smi_check_forward_dr_smp(smp);
2105 if (retsmi == IB_SMI_LOCAL)
2106 return IB_SMI_HANDLE;
2107
2108 if (retsmi == IB_SMI_SEND) { /* don't forward */
2109 if (opa_smi_handle_dr_smp_send(smp,
2110 rdma_cap_ib_switch(port_priv->device),
2111 port_num) == IB_SMI_DISCARD)
2112 return IB_SMI_DISCARD;
2113
2114 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2115 IB_SMI_DISCARD)
2116 return IB_SMI_DISCARD;
2117
2118 } else if (rdma_cap_ib_switch(port_priv->device)) {
2119 /* forward case for switches */
2120 memcpy(response, recv, mad_priv_size(response));
2121 response->header.recv_wc.wc = &response->header.wc;
2122 response->header.recv_wc.recv_buf.opa_mad =
2123 (struct opa_mad *)response->mad;
2124 response->header.recv_wc.recv_buf.grh = &response->grh;
2125
2126 agent_send_response((const struct ib_mad_hdr *)response->mad,
2127 &response->grh, wc,
2128 port_priv->device,
2129 opa_smi_get_fwd_port(smp),
2130 qp_info->qp->qp_num,
2131 recv->header.wc.byte_len,
2132 true);
2133
2134 return IB_SMI_DISCARD;
2135 }
2136
2137 return IB_SMI_HANDLE;
2138}
2139
2140static enum smi_action
2141handle_smi(struct ib_mad_port_private *port_priv,
2142 struct ib_mad_qp_info *qp_info,
2143 struct ib_wc *wc,
2144 int port_num,
2145 struct ib_mad_private *recv,
2146 struct ib_mad_private *response,
2147 bool opa)
2148{
2149 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2150
2151 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2152 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2153 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2154 response);
2155
2156 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2157}
2158
2159static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2160{
2161 struct ib_mad_port_private *port_priv = cq->cq_context;
2162 struct ib_mad_list_head *mad_list =
2163 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2164 struct ib_mad_qp_info *qp_info;
2165 struct ib_mad_private_header *mad_priv_hdr;
2166 struct ib_mad_private *recv, *response = NULL;
2167 struct ib_mad_agent_private *mad_agent;
2168 int port_num;
2169 int ret = IB_MAD_RESULT_SUCCESS;
2170 size_t mad_size;
2171 u16 resp_mad_pkey_index = 0;
2172 bool opa;
2173
2174 if (list_empty_careful(&port_priv->port_list))
2175 return;
2176
2177 if (wc->status != IB_WC_SUCCESS) {
2178 /*
2179 * Receive errors indicate that the QP has entered the error
2180 * state - error handling/shutdown code will cleanup
2181 */
2182 return;
2183 }
2184
2185 qp_info = mad_list->mad_queue->qp_info;
2186 dequeue_mad(mad_list);
2187
2188 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2189 qp_info->port_priv->port_num);
2190
2191 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2192 mad_list);
2193 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2194 ib_dma_unmap_single(port_priv->device,
2195 recv->header.mapping,
2196 mad_priv_dma_size(recv),
2197 DMA_FROM_DEVICE);
2198
2199 /* Setup MAD receive work completion from "normal" work completion */
2200 recv->header.wc = *wc;
2201 recv->header.recv_wc.wc = &recv->header.wc;
2202
2203 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2204 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2205 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2206 } else {
2207 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2208 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2209 }
2210
2211 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2212 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2213
2214 if (atomic_read(&qp_info->snoop_count))
2215 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2216
2217 /* Validate MAD */
2218 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2219 goto out;
2220
2221 mad_size = recv->mad_size;
2222 response = alloc_mad_private(mad_size, GFP_KERNEL);
2223 if (!response)
2224 goto out;
2225
2226 if (rdma_cap_ib_switch(port_priv->device))
2227 port_num = wc->port_num;
2228 else
2229 port_num = port_priv->port_num;
2230
2231 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2232 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2233 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2234 response, opa)
2235 == IB_SMI_DISCARD)
2236 goto out;
2237 }
2238
2239 /* Give driver "right of first refusal" on incoming MAD */
2240 if (port_priv->device->process_mad) {
2241 ret = port_priv->device->process_mad(port_priv->device, 0,
2242 port_priv->port_num,
2243 wc, &recv->grh,
2244 (const struct ib_mad_hdr *)recv->mad,
2245 recv->mad_size,
2246 (struct ib_mad_hdr *)response->mad,
2247 &mad_size, &resp_mad_pkey_index);
2248
2249 if (opa)
2250 wc->pkey_index = resp_mad_pkey_index;
2251
2252 if (ret & IB_MAD_RESULT_SUCCESS) {
2253 if (ret & IB_MAD_RESULT_CONSUMED)
2254 goto out;
2255 if (ret & IB_MAD_RESULT_REPLY) {
2256 agent_send_response((const struct ib_mad_hdr *)response->mad,
2257 &recv->grh, wc,
2258 port_priv->device,
2259 port_num,
2260 qp_info->qp->qp_num,
2261 mad_size, opa);
2262 goto out;
2263 }
2264 }
2265 }
2266
2267 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2268 if (mad_agent) {
2269 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2270 /*
2271 * recv is freed up in error cases in ib_mad_complete_recv
2272 * or via recv_handler in ib_mad_complete_recv()
2273 */
2274 recv = NULL;
2275 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2276 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2277 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2278 port_priv->device, port_num,
2279 qp_info->qp->qp_num, mad_size, opa);
2280 }
2281
2282out:
2283 /* Post another receive request for this QP */
2284 if (response) {
2285 ib_mad_post_receive_mads(qp_info, response);
2286 kfree(recv);
2287 } else
2288 ib_mad_post_receive_mads(qp_info, recv);
2289}
2290
2291static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2292{
2293 struct ib_mad_send_wr_private *mad_send_wr;
2294 unsigned long delay;
2295
2296 if (list_empty(&mad_agent_priv->wait_list)) {
2297 cancel_delayed_work(&mad_agent_priv->timed_work);
2298 } else {
2299 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2300 struct ib_mad_send_wr_private,
2301 agent_list);
2302
2303 if (time_after(mad_agent_priv->timeout,
2304 mad_send_wr->timeout)) {
2305 mad_agent_priv->timeout = mad_send_wr->timeout;
2306 delay = mad_send_wr->timeout - jiffies;
2307 if ((long)delay <= 0)
2308 delay = 1;
2309 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2310 &mad_agent_priv->timed_work, delay);
2311 }
2312 }
2313}
2314
2315static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2316{
2317 struct ib_mad_agent_private *mad_agent_priv;
2318 struct ib_mad_send_wr_private *temp_mad_send_wr;
2319 struct list_head *list_item;
2320 unsigned long delay;
2321
2322 mad_agent_priv = mad_send_wr->mad_agent_priv;
2323 list_del(&mad_send_wr->agent_list);
2324
2325 delay = mad_send_wr->timeout;
2326 mad_send_wr->timeout += jiffies;
2327
2328 if (delay) {
2329 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2330 temp_mad_send_wr = list_entry(list_item,
2331 struct ib_mad_send_wr_private,
2332 agent_list);
2333 if (time_after(mad_send_wr->timeout,
2334 temp_mad_send_wr->timeout))
2335 break;
2336 }
2337 }
2338 else
2339 list_item = &mad_agent_priv->wait_list;
2340 list_add(&mad_send_wr->agent_list, list_item);
2341
2342 /* Reschedule a work item if we have a shorter timeout */
2343 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2344 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2345 &mad_agent_priv->timed_work, delay);
2346}
2347
2348void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2349 int timeout_ms)
2350{
2351 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2352 wait_for_response(mad_send_wr);
2353}
2354
2355/*
2356 * Process a send work completion
2357 */
2358void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2359 struct ib_mad_send_wc *mad_send_wc)
2360{
2361 struct ib_mad_agent_private *mad_agent_priv;
2362 unsigned long flags;
2363 int ret;
2364
2365 mad_agent_priv = mad_send_wr->mad_agent_priv;
2366 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2367 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2368 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2369 if (ret == IB_RMPP_RESULT_CONSUMED)
2370 goto done;
2371 } else
2372 ret = IB_RMPP_RESULT_UNHANDLED;
2373
2374 if (mad_send_wc->status != IB_WC_SUCCESS &&
2375 mad_send_wr->status == IB_WC_SUCCESS) {
2376 mad_send_wr->status = mad_send_wc->status;
2377 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2378 }
2379
2380 if (--mad_send_wr->refcount > 0) {
2381 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2382 mad_send_wr->status == IB_WC_SUCCESS) {
2383 wait_for_response(mad_send_wr);
2384 }
2385 goto done;
2386 }
2387
2388 /* Remove send from MAD agent and notify client of completion */
2389 list_del(&mad_send_wr->agent_list);
2390 adjust_timeout(mad_agent_priv);
2391 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2392
2393 if (mad_send_wr->status != IB_WC_SUCCESS )
2394 mad_send_wc->status = mad_send_wr->status;
2395 if (ret == IB_RMPP_RESULT_INTERNAL)
2396 ib_rmpp_send_handler(mad_send_wc);
2397 else
2398 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2399 mad_send_wc);
2400
2401 /* Release reference on agent taken when sending */
2402 deref_mad_agent(mad_agent_priv);
2403 return;
2404done:
2405 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2406}
2407
2408static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2409{
2410 struct ib_mad_port_private *port_priv = cq->cq_context;
2411 struct ib_mad_list_head *mad_list =
2412 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2413 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2414 struct ib_mad_qp_info *qp_info;
2415 struct ib_mad_queue *send_queue;
2416 struct ib_send_wr *bad_send_wr;
2417 struct ib_mad_send_wc mad_send_wc;
2418 unsigned long flags;
2419 int ret;
2420
2421 if (list_empty_careful(&port_priv->port_list))
2422 return;
2423
2424 if (wc->status != IB_WC_SUCCESS) {
2425 if (!ib_mad_send_error(port_priv, wc))
2426 return;
2427 }
2428
2429 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2430 mad_list);
2431 send_queue = mad_list->mad_queue;
2432 qp_info = send_queue->qp_info;
2433
2434retry:
2435 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2436 mad_send_wr->header_mapping,
2437 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2438 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2439 mad_send_wr->payload_mapping,
2440 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2441 queued_send_wr = NULL;
2442 spin_lock_irqsave(&send_queue->lock, flags);
2443 list_del(&mad_list->list);
2444
2445 /* Move queued send to the send queue */
2446 if (send_queue->count-- > send_queue->max_active) {
2447 mad_list = container_of(qp_info->overflow_list.next,
2448 struct ib_mad_list_head, list);
2449 queued_send_wr = container_of(mad_list,
2450 struct ib_mad_send_wr_private,
2451 mad_list);
2452 list_move_tail(&mad_list->list, &send_queue->list);
2453 }
2454 spin_unlock_irqrestore(&send_queue->lock, flags);
2455
2456 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2457 mad_send_wc.status = wc->status;
2458 mad_send_wc.vendor_err = wc->vendor_err;
2459 if (atomic_read(&qp_info->snoop_count))
2460 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2461 IB_MAD_SNOOP_SEND_COMPLETIONS);
2462 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2463
2464 if (queued_send_wr) {
2465 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2466 &bad_send_wr);
2467 if (ret) {
2468 dev_err(&port_priv->device->dev,
2469 "ib_post_send failed: %d\n", ret);
2470 mad_send_wr = queued_send_wr;
2471 wc->status = IB_WC_LOC_QP_OP_ERR;
2472 goto retry;
2473 }
2474 }
2475}
2476
2477static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2478{
2479 struct ib_mad_send_wr_private *mad_send_wr;
2480 struct ib_mad_list_head *mad_list;
2481 unsigned long flags;
2482
2483 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2484 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2485 mad_send_wr = container_of(mad_list,
2486 struct ib_mad_send_wr_private,
2487 mad_list);
2488 mad_send_wr->retry = 1;
2489 }
2490 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2491}
2492
2493static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2494 struct ib_wc *wc)
2495{
2496 struct ib_mad_list_head *mad_list =
2497 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2498 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2499 struct ib_mad_send_wr_private *mad_send_wr;
2500 int ret;
2501
2502 /*
2503 * Send errors will transition the QP to SQE - move
2504 * QP to RTS and repost flushed work requests
2505 */
2506 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2507 mad_list);
2508 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2509 if (mad_send_wr->retry) {
2510 /* Repost send */
2511 struct ib_send_wr *bad_send_wr;
2512
2513 mad_send_wr->retry = 0;
2514 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2515 &bad_send_wr);
2516 if (!ret)
2517 return false;
2518 }
2519 } else {
2520 struct ib_qp_attr *attr;
2521
2522 /* Transition QP to RTS and fail offending send */
2523 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2524 if (attr) {
2525 attr->qp_state = IB_QPS_RTS;
2526 attr->cur_qp_state = IB_QPS_SQE;
2527 ret = ib_modify_qp(qp_info->qp, attr,
2528 IB_QP_STATE | IB_QP_CUR_STATE);
2529 kfree(attr);
2530 if (ret)
2531 dev_err(&port_priv->device->dev,
2532 "%s - ib_modify_qp to RTS: %d\n",
2533 __func__, ret);
2534 else
2535 mark_sends_for_retry(qp_info);
2536 }
2537 }
2538
2539 return true;
2540}
2541
2542static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2543{
2544 unsigned long flags;
2545 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2546 struct ib_mad_send_wc mad_send_wc;
2547 struct list_head cancel_list;
2548
2549 INIT_LIST_HEAD(&cancel_list);
2550
2551 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2552 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2553 &mad_agent_priv->send_list, agent_list) {
2554 if (mad_send_wr->status == IB_WC_SUCCESS) {
2555 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2556 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2557 }
2558 }
2559
2560 /* Empty wait list to prevent receives from finding a request */
2561 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2562 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2563
2564 /* Report all cancelled requests */
2565 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2566 mad_send_wc.vendor_err = 0;
2567
2568 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2569 &cancel_list, agent_list) {
2570 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2571 list_del(&mad_send_wr->agent_list);
2572 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2573 &mad_send_wc);
2574 atomic_dec(&mad_agent_priv->refcount);
2575 }
2576}
2577
2578static struct ib_mad_send_wr_private*
2579find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2580 struct ib_mad_send_buf *send_buf)
2581{
2582 struct ib_mad_send_wr_private *mad_send_wr;
2583
2584 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2585 agent_list) {
2586 if (&mad_send_wr->send_buf == send_buf)
2587 return mad_send_wr;
2588 }
2589
2590 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2591 agent_list) {
2592 if (is_rmpp_data_mad(mad_agent_priv,
2593 mad_send_wr->send_buf.mad) &&
2594 &mad_send_wr->send_buf == send_buf)
2595 return mad_send_wr;
2596 }
2597 return NULL;
2598}
2599
2600int ib_modify_mad(struct ib_mad_agent *mad_agent,
2601 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2602{
2603 struct ib_mad_agent_private *mad_agent_priv;
2604 struct ib_mad_send_wr_private *mad_send_wr;
2605 unsigned long flags;
2606 int active;
2607
2608 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2609 agent);
2610 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2611 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2612 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2613 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2614 return -EINVAL;
2615 }
2616
2617 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2618 if (!timeout_ms) {
2619 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2620 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2621 }
2622
2623 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2624 if (active)
2625 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2626 else
2627 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2628
2629 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2630 return 0;
2631}
2632EXPORT_SYMBOL(ib_modify_mad);
2633
2634void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2635 struct ib_mad_send_buf *send_buf)
2636{
2637 ib_modify_mad(mad_agent, send_buf, 0);
2638}
2639EXPORT_SYMBOL(ib_cancel_mad);
2640
2641static void local_completions(struct work_struct *work)
2642{
2643 struct ib_mad_agent_private *mad_agent_priv;
2644 struct ib_mad_local_private *local;
2645 struct ib_mad_agent_private *recv_mad_agent;
2646 unsigned long flags;
2647 int free_mad;
2648 struct ib_wc wc;
2649 struct ib_mad_send_wc mad_send_wc;
2650 bool opa;
2651
2652 mad_agent_priv =
2653 container_of(work, struct ib_mad_agent_private, local_work);
2654
2655 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2656 mad_agent_priv->qp_info->port_priv->port_num);
2657
2658 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2659 while (!list_empty(&mad_agent_priv->local_list)) {
2660 local = list_entry(mad_agent_priv->local_list.next,
2661 struct ib_mad_local_private,
2662 completion_list);
2663 list_del(&local->completion_list);
2664 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2665 free_mad = 0;
2666 if (local->mad_priv) {
2667 u8 base_version;
2668 recv_mad_agent = local->recv_mad_agent;
2669 if (!recv_mad_agent) {
2670 dev_err(&mad_agent_priv->agent.device->dev,
2671 "No receive MAD agent for local completion\n");
2672 free_mad = 1;
2673 goto local_send_completion;
2674 }
2675
2676 /*
2677 * Defined behavior is to complete response
2678 * before request
2679 */
2680 build_smp_wc(recv_mad_agent->agent.qp,
2681 local->mad_send_wr->send_wr.wr.wr_cqe,
2682 be16_to_cpu(IB_LID_PERMISSIVE),
2683 local->mad_send_wr->send_wr.pkey_index,
2684 recv_mad_agent->agent.port_num, &wc);
2685
2686 local->mad_priv->header.recv_wc.wc = &wc;
2687
2688 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2689 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2690 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2691 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2692 } else {
2693 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2694 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2695 }
2696
2697 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2698 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2699 &local->mad_priv->header.recv_wc.rmpp_list);
2700 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2701 local->mad_priv->header.recv_wc.recv_buf.mad =
2702 (struct ib_mad *)local->mad_priv->mad;
2703 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2704 snoop_recv(recv_mad_agent->qp_info,
2705 &local->mad_priv->header.recv_wc,
2706 IB_MAD_SNOOP_RECVS);
2707 recv_mad_agent->agent.recv_handler(
2708 &recv_mad_agent->agent,
2709 &local->mad_send_wr->send_buf,
2710 &local->mad_priv->header.recv_wc);
2711 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2712 atomic_dec(&recv_mad_agent->refcount);
2713 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2714 }
2715
2716local_send_completion:
2717 /* Complete send */
2718 mad_send_wc.status = IB_WC_SUCCESS;
2719 mad_send_wc.vendor_err = 0;
2720 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2721 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2722 snoop_send(mad_agent_priv->qp_info,
2723 &local->mad_send_wr->send_buf,
2724 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2725 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2726 &mad_send_wc);
2727
2728 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2729 atomic_dec(&mad_agent_priv->refcount);
2730 if (free_mad)
2731 kfree(local->mad_priv);
2732 kfree(local);
2733 }
2734 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2735}
2736
2737static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2738{
2739 int ret;
2740
2741 if (!mad_send_wr->retries_left)
2742 return -ETIMEDOUT;
2743
2744 mad_send_wr->retries_left--;
2745 mad_send_wr->send_buf.retries++;
2746
2747 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2748
2749 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2750 ret = ib_retry_rmpp(mad_send_wr);
2751 switch (ret) {
2752 case IB_RMPP_RESULT_UNHANDLED:
2753 ret = ib_send_mad(mad_send_wr);
2754 break;
2755 case IB_RMPP_RESULT_CONSUMED:
2756 ret = 0;
2757 break;
2758 default:
2759 ret = -ECOMM;
2760 break;
2761 }
2762 } else
2763 ret = ib_send_mad(mad_send_wr);
2764
2765 if (!ret) {
2766 mad_send_wr->refcount++;
2767 list_add_tail(&mad_send_wr->agent_list,
2768 &mad_send_wr->mad_agent_priv->send_list);
2769 }
2770 return ret;
2771}
2772
2773static void timeout_sends(struct work_struct *work)
2774{
2775 struct ib_mad_agent_private *mad_agent_priv;
2776 struct ib_mad_send_wr_private *mad_send_wr;
2777 struct ib_mad_send_wc mad_send_wc;
2778 unsigned long flags, delay;
2779
2780 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2781 timed_work.work);
2782 mad_send_wc.vendor_err = 0;
2783
2784 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2785 while (!list_empty(&mad_agent_priv->wait_list)) {
2786 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2787 struct ib_mad_send_wr_private,
2788 agent_list);
2789
2790 if (time_after(mad_send_wr->timeout, jiffies)) {
2791 delay = mad_send_wr->timeout - jiffies;
2792 if ((long)delay <= 0)
2793 delay = 1;
2794 queue_delayed_work(mad_agent_priv->qp_info->
2795 port_priv->wq,
2796 &mad_agent_priv->timed_work, delay);
2797 break;
2798 }
2799
2800 list_del(&mad_send_wr->agent_list);
2801 if (mad_send_wr->status == IB_WC_SUCCESS &&
2802 !retry_send(mad_send_wr))
2803 continue;
2804
2805 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2806
2807 if (mad_send_wr->status == IB_WC_SUCCESS)
2808 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2809 else
2810 mad_send_wc.status = mad_send_wr->status;
2811 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2812 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2813 &mad_send_wc);
2814
2815 atomic_dec(&mad_agent_priv->refcount);
2816 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2817 }
2818 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2819}
2820
2821/*
2822 * Allocate receive MADs and post receive WRs for them
2823 */
2824static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2825 struct ib_mad_private *mad)
2826{
2827 unsigned long flags;
2828 int post, ret;
2829 struct ib_mad_private *mad_priv;
2830 struct ib_sge sg_list;
2831 struct ib_recv_wr recv_wr, *bad_recv_wr;
2832 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2833
2834 /* Initialize common scatter list fields */
2835 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2836
2837 /* Initialize common receive WR fields */
2838 recv_wr.next = NULL;
2839 recv_wr.sg_list = &sg_list;
2840 recv_wr.num_sge = 1;
2841
2842 do {
2843 /* Allocate and map receive buffer */
2844 if (mad) {
2845 mad_priv = mad;
2846 mad = NULL;
2847 } else {
2848 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2849 GFP_ATOMIC);
2850 if (!mad_priv) {
2851 ret = -ENOMEM;
2852 break;
2853 }
2854 }
2855 sg_list.length = mad_priv_dma_size(mad_priv);
2856 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2857 &mad_priv->grh,
2858 mad_priv_dma_size(mad_priv),
2859 DMA_FROM_DEVICE);
2860 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2861 sg_list.addr))) {
2862 ret = -ENOMEM;
2863 break;
2864 }
2865 mad_priv->header.mapping = sg_list.addr;
2866 mad_priv->header.mad_list.mad_queue = recv_queue;
2867 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2868 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2869
2870 /* Post receive WR */
2871 spin_lock_irqsave(&recv_queue->lock, flags);
2872 post = (++recv_queue->count < recv_queue->max_active);
2873 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2874 spin_unlock_irqrestore(&recv_queue->lock, flags);
2875 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2876 if (ret) {
2877 spin_lock_irqsave(&recv_queue->lock, flags);
2878 list_del(&mad_priv->header.mad_list.list);
2879 recv_queue->count--;
2880 spin_unlock_irqrestore(&recv_queue->lock, flags);
2881 ib_dma_unmap_single(qp_info->port_priv->device,
2882 mad_priv->header.mapping,
2883 mad_priv_dma_size(mad_priv),
2884 DMA_FROM_DEVICE);
2885 kfree(mad_priv);
2886 dev_err(&qp_info->port_priv->device->dev,
2887 "ib_post_recv failed: %d\n", ret);
2888 break;
2889 }
2890 } while (post);
2891
2892 return ret;
2893}
2894
2895/*
2896 * Return all the posted receive MADs
2897 */
2898static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2899{
2900 struct ib_mad_private_header *mad_priv_hdr;
2901 struct ib_mad_private *recv;
2902 struct ib_mad_list_head *mad_list;
2903
2904 if (!qp_info->qp)
2905 return;
2906
2907 while (!list_empty(&qp_info->recv_queue.list)) {
2908
2909 mad_list = list_entry(qp_info->recv_queue.list.next,
2910 struct ib_mad_list_head, list);
2911 mad_priv_hdr = container_of(mad_list,
2912 struct ib_mad_private_header,
2913 mad_list);
2914 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2915 header);
2916
2917 /* Remove from posted receive MAD list */
2918 list_del(&mad_list->list);
2919
2920 ib_dma_unmap_single(qp_info->port_priv->device,
2921 recv->header.mapping,
2922 mad_priv_dma_size(recv),
2923 DMA_FROM_DEVICE);
2924 kfree(recv);
2925 }
2926
2927 qp_info->recv_queue.count = 0;
2928}
2929
2930/*
2931 * Start the port
2932 */
2933static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2934{
2935 int ret, i;
2936 struct ib_qp_attr *attr;
2937 struct ib_qp *qp;
2938 u16 pkey_index;
2939
2940 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2941 if (!attr)
2942 return -ENOMEM;
2943
2944 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2945 IB_DEFAULT_PKEY_FULL, &pkey_index);
2946 if (ret)
2947 pkey_index = 0;
2948
2949 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2950 qp = port_priv->qp_info[i].qp;
2951 if (!qp)
2952 continue;
2953
2954 /*
2955 * PKey index for QP1 is irrelevant but
2956 * one is needed for the Reset to Init transition
2957 */
2958 attr->qp_state = IB_QPS_INIT;
2959 attr->pkey_index = pkey_index;
2960 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2961 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2962 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2963 if (ret) {
2964 dev_err(&port_priv->device->dev,
2965 "Couldn't change QP%d state to INIT: %d\n",
2966 i, ret);
2967 goto out;
2968 }
2969
2970 attr->qp_state = IB_QPS_RTR;
2971 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2972 if (ret) {
2973 dev_err(&port_priv->device->dev,
2974 "Couldn't change QP%d state to RTR: %d\n",
2975 i, ret);
2976 goto out;
2977 }
2978
2979 attr->qp_state = IB_QPS_RTS;
2980 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2981 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2982 if (ret) {
2983 dev_err(&port_priv->device->dev,
2984 "Couldn't change QP%d state to RTS: %d\n",
2985 i, ret);
2986 goto out;
2987 }
2988 }
2989
2990 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2991 if (ret) {
2992 dev_err(&port_priv->device->dev,
2993 "Failed to request completion notification: %d\n",
2994 ret);
2995 goto out;
2996 }
2997
2998 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2999 if (!port_priv->qp_info[i].qp)
3000 continue;
3001
3002 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3003 if (ret) {
3004 dev_err(&port_priv->device->dev,
3005 "Couldn't post receive WRs\n");
3006 goto out;
3007 }
3008 }
3009out:
3010 kfree(attr);
3011 return ret;
3012}
3013
3014static void qp_event_handler(struct ib_event *event, void *qp_context)
3015{
3016 struct ib_mad_qp_info *qp_info = qp_context;
3017
3018 /* It's worse than that! He's dead, Jim! */
3019 dev_err(&qp_info->port_priv->device->dev,
3020 "Fatal error (%d) on MAD QP (%d)\n",
3021 event->event, qp_info->qp->qp_num);
3022}
3023
3024static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3025 struct ib_mad_queue *mad_queue)
3026{
3027 mad_queue->qp_info = qp_info;
3028 mad_queue->count = 0;
3029 spin_lock_init(&mad_queue->lock);
3030 INIT_LIST_HEAD(&mad_queue->list);
3031}
3032
3033static void init_mad_qp(struct ib_mad_port_private *port_priv,
3034 struct ib_mad_qp_info *qp_info)
3035{
3036 qp_info->port_priv = port_priv;
3037 init_mad_queue(qp_info, &qp_info->send_queue);
3038 init_mad_queue(qp_info, &qp_info->recv_queue);
3039 INIT_LIST_HEAD(&qp_info->overflow_list);
3040 spin_lock_init(&qp_info->snoop_lock);
3041 qp_info->snoop_table = NULL;
3042 qp_info->snoop_table_size = 0;
3043 atomic_set(&qp_info->snoop_count, 0);
3044}
3045
3046static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3047 enum ib_qp_type qp_type)
3048{
3049 struct ib_qp_init_attr qp_init_attr;
3050 int ret;
3051
3052 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3053 qp_init_attr.send_cq = qp_info->port_priv->cq;
3054 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3055 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3056 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3057 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3058 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3059 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3060 qp_init_attr.qp_type = qp_type;
3061 qp_init_attr.port_num = qp_info->port_priv->port_num;
3062 qp_init_attr.qp_context = qp_info;
3063 qp_init_attr.event_handler = qp_event_handler;
3064 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3065 if (IS_ERR(qp_info->qp)) {
3066 dev_err(&qp_info->port_priv->device->dev,
3067 "Couldn't create ib_mad QP%d\n",
3068 get_spl_qp_index(qp_type));
3069 ret = PTR_ERR(qp_info->qp);
3070 goto error;
3071 }
3072 /* Use minimum queue sizes unless the CQ is resized */
3073 qp_info->send_queue.max_active = mad_sendq_size;
3074 qp_info->recv_queue.max_active = mad_recvq_size;
3075 return 0;
3076
3077error:
3078 return ret;
3079}
3080
3081static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3082{
3083 if (!qp_info->qp)
3084 return;
3085
3086 ib_destroy_qp(qp_info->qp);
3087 kfree(qp_info->snoop_table);
3088}
3089
3090/*
3091 * Open the port
3092 * Create the QP, PD, MR, and CQ if needed
3093 */
3094static int ib_mad_port_open(struct ib_device *device,
3095 int port_num)
3096{
3097 int ret, cq_size;
3098 struct ib_mad_port_private *port_priv;
3099 unsigned long flags;
3100 char name[sizeof "ib_mad123"];
3101 int has_smi;
3102
3103 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3104 return -EFAULT;
3105
3106 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3107 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3108 return -EFAULT;
3109
3110 /* Create new device info */
3111 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3112 if (!port_priv)
3113 return -ENOMEM;
3114
3115 port_priv->device = device;
3116 port_priv->port_num = port_num;
3117 spin_lock_init(&port_priv->reg_lock);
3118 INIT_LIST_HEAD(&port_priv->agent_list);
3119 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3120 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3121
3122 cq_size = mad_sendq_size + mad_recvq_size;
3123 has_smi = rdma_cap_ib_smi(device, port_num);
3124 if (has_smi)
3125 cq_size *= 2;
3126
3127 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3128 IB_POLL_WORKQUEUE);
3129 if (IS_ERR(port_priv->cq)) {
3130 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3131 ret = PTR_ERR(port_priv->cq);
3132 goto error3;
3133 }
3134
3135 port_priv->pd = ib_alloc_pd(device, 0);
3136 if (IS_ERR(port_priv->pd)) {
3137 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3138 ret = PTR_ERR(port_priv->pd);
3139 goto error4;
3140 }
3141
3142 if (has_smi) {
3143 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3144 if (ret)
3145 goto error6;
3146 }
3147 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3148 if (ret)
3149 goto error7;
3150
3151 snprintf(name, sizeof name, "ib_mad%d", port_num);
3152 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3153 if (!port_priv->wq) {
3154 ret = -ENOMEM;
3155 goto error8;
3156 }
3157
3158 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3159 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3160 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3161
3162 ret = ib_mad_port_start(port_priv);
3163 if (ret) {
3164 dev_err(&device->dev, "Couldn't start port\n");
3165 goto error9;
3166 }
3167
3168 return 0;
3169
3170error9:
3171 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3172 list_del_init(&port_priv->port_list);
3173 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3174
3175 destroy_workqueue(port_priv->wq);
3176error8:
3177 destroy_mad_qp(&port_priv->qp_info[1]);
3178error7:
3179 destroy_mad_qp(&port_priv->qp_info[0]);
3180error6:
3181 ib_dealloc_pd(port_priv->pd);
3182error4:
3183 ib_free_cq(port_priv->cq);
3184 cleanup_recv_queue(&port_priv->qp_info[1]);
3185 cleanup_recv_queue(&port_priv->qp_info[0]);
3186error3:
3187 kfree(port_priv);
3188
3189 return ret;
3190}
3191
3192/*
3193 * Close the port
3194 * If there are no classes using the port, free the port
3195 * resources (CQ, MR, PD, QP) and remove the port's info structure
3196 */
3197static int ib_mad_port_close(struct ib_device *device, int port_num)
3198{
3199 struct ib_mad_port_private *port_priv;
3200 unsigned long flags;
3201
3202 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3203 port_priv = __ib_get_mad_port(device, port_num);
3204 if (port_priv == NULL) {
3205 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3206 dev_err(&device->dev, "Port %d not found\n", port_num);
3207 return -ENODEV;
3208 }
3209 list_del_init(&port_priv->port_list);
3210 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3211
3212 destroy_workqueue(port_priv->wq);
3213 destroy_mad_qp(&port_priv->qp_info[1]);
3214 destroy_mad_qp(&port_priv->qp_info[0]);
3215 ib_dealloc_pd(port_priv->pd);
3216 ib_free_cq(port_priv->cq);
3217 cleanup_recv_queue(&port_priv->qp_info[1]);
3218 cleanup_recv_queue(&port_priv->qp_info[0]);
3219 /* XXX: Handle deallocation of MAD registration tables */
3220
3221 kfree(port_priv);
3222
3223 return 0;
3224}
3225
3226static void ib_mad_init_device(struct ib_device *device)
3227{
3228 int start, i;
3229
3230 start = rdma_start_port(device);
3231
3232 for (i = start; i <= rdma_end_port(device); i++) {
3233 if (!rdma_cap_ib_mad(device, i))
3234 continue;
3235
3236 if (ib_mad_port_open(device, i)) {
3237 dev_err(&device->dev, "Couldn't open port %d\n", i);
3238 goto error;
3239 }
3240 if (ib_agent_port_open(device, i)) {
3241 dev_err(&device->dev,
3242 "Couldn't open port %d for agents\n", i);
3243 goto error_agent;
3244 }
3245 }
3246 return;
3247
3248error_agent:
3249 if (ib_mad_port_close(device, i))
3250 dev_err(&device->dev, "Couldn't close port %d\n", i);
3251
3252error:
3253 while (--i >= start) {
3254 if (!rdma_cap_ib_mad(device, i))
3255 continue;
3256
3257 if (ib_agent_port_close(device, i))
3258 dev_err(&device->dev,
3259 "Couldn't close port %d for agents\n", i);
3260 if (ib_mad_port_close(device, i))
3261 dev_err(&device->dev, "Couldn't close port %d\n", i);
3262 }
3263}
3264
3265static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3266{
3267 int i;
3268
3269 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3270 if (!rdma_cap_ib_mad(device, i))
3271 continue;
3272
3273 if (ib_agent_port_close(device, i))
3274 dev_err(&device->dev,
3275 "Couldn't close port %d for agents\n", i);
3276 if (ib_mad_port_close(device, i))
3277 dev_err(&device->dev, "Couldn't close port %d\n", i);
3278 }
3279}
3280
3281static struct ib_client mad_client = {
3282 .name = "mad",
3283 .add = ib_mad_init_device,
3284 .remove = ib_mad_remove_device
3285};
3286
3287int ib_mad_init(void)
3288{
3289 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3290 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3291
3292 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3293 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3294
3295 INIT_LIST_HEAD(&ib_mad_port_list);
3296
3297 if (ib_register_client(&mad_client)) {
3298 pr_err("Couldn't register ib_mad client\n");
3299 return -EINVAL;
3300 }
3301
3302 return 0;
3303}
3304
3305void ib_mad_cleanup(void)
3306{
3307 ib_unregister_client(&mad_client);
3308}