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Merge tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / drivers / infiniband / core / mad.c
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
51 MODULE_LICENSE("Dual BSD/GPL");
52 MODULE_DESCRIPTION("kernel IB MAD API");
53 MODULE_AUTHOR("Hal Rosenstock");
54 MODULE_AUTHOR("Sean Hefty");
55
56 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
57 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
58
59 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
61 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
63
64 static struct list_head ib_mad_port_list;
65 static u32 ib_mad_client_id = 0;
66
67 /* Port list lock */
68 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
69
70 /* Forward declarations */
71 static int method_in_use(struct ib_mad_mgmt_method_table **method,
72 struct ib_mad_reg_req *mad_reg_req);
73 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
74 static struct ib_mad_agent_private *find_mad_agent(
75 struct ib_mad_port_private *port_priv,
76 const struct ib_mad_hdr *mad);
77 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
78 struct ib_mad_private *mad);
79 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
80 static void timeout_sends(struct work_struct *work);
81 static void local_completions(struct work_struct *work);
82 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv,
84 u8 mgmt_class);
85 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
86 struct ib_mad_agent_private *agent_priv);
87
88 /*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92 static inline struct ib_mad_port_private *
93 __ib_get_mad_port(struct ib_device *device, int port_num)
94 {
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102 }
103
104 /*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108 static inline struct ib_mad_port_private *
109 ib_get_mad_port(struct ib_device *device, int port_num)
110 {
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119 }
120
121 static inline u8 convert_mgmt_class(u8 mgmt_class)
122 {
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126 }
127
128 static int get_spl_qp_index(enum ib_qp_type qp_type)
129 {
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139 }
140
141 static int vendor_class_index(u8 mgmt_class)
142 {
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144 }
145
146 static int is_vendor_class(u8 mgmt_class)
147 {
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152 }
153
154 static int is_vendor_oui(char *oui)
155 {
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159 }
160
161 static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164 {
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180 }
181
182 int ib_response_mad(const struct ib_mad_hdr *hdr)
183 {
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188 }
189 EXPORT_SYMBOL(ib_response_mad);
190
191 /*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203 {
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
321 ret = ERR_PTR(-ENODEV);
322 goto error1;
323 }
324
325 /* Verify the QP requested is supported. For example, Ethernet devices
326 * will not have QP0 */
327 if (!port_priv->qp_info[qpn].qp) {
328 dev_notice(&device->dev,
329 "ib_register_mad_agent: QP %d not supported\n", qpn);
330 ret = ERR_PTR(-EPROTONOSUPPORT);
331 goto error1;
332 }
333
334 /* Allocate structures */
335 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
336 if (!mad_agent_priv) {
337 ret = ERR_PTR(-ENOMEM);
338 goto error1;
339 }
340
341 if (mad_reg_req) {
342 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
343 if (!reg_req) {
344 ret = ERR_PTR(-ENOMEM);
345 goto error3;
346 }
347 }
348
349 /* Now, fill in the various structures */
350 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
351 mad_agent_priv->reg_req = reg_req;
352 mad_agent_priv->agent.rmpp_version = rmpp_version;
353 mad_agent_priv->agent.device = device;
354 mad_agent_priv->agent.recv_handler = recv_handler;
355 mad_agent_priv->agent.send_handler = send_handler;
356 mad_agent_priv->agent.context = context;
357 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
358 mad_agent_priv->agent.port_num = port_num;
359 mad_agent_priv->agent.flags = registration_flags;
360 spin_lock_init(&mad_agent_priv->lock);
361 INIT_LIST_HEAD(&mad_agent_priv->send_list);
362 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
363 INIT_LIST_HEAD(&mad_agent_priv->done_list);
364 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
365 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
366 INIT_LIST_HEAD(&mad_agent_priv->local_list);
367 INIT_WORK(&mad_agent_priv->local_work, local_completions);
368 atomic_set(&mad_agent_priv->refcount, 1);
369 init_completion(&mad_agent_priv->comp);
370
371 spin_lock_irqsave(&port_priv->reg_lock, flags);
372 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
373
374 /*
375 * Make sure MAD registration (if supplied)
376 * is non overlapping with any existing ones
377 */
378 if (mad_reg_req) {
379 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
380 if (!is_vendor_class(mgmt_class)) {
381 class = port_priv->version[mad_reg_req->
382 mgmt_class_version].class;
383 if (class) {
384 method = class->method_table[mgmt_class];
385 if (method) {
386 if (method_in_use(&method,
387 mad_reg_req))
388 goto error4;
389 }
390 }
391 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
392 mgmt_class);
393 } else {
394 /* "New" vendor class range */
395 vendor = port_priv->version[mad_reg_req->
396 mgmt_class_version].vendor;
397 if (vendor) {
398 vclass = vendor_class_index(mgmt_class);
399 vendor_class = vendor->vendor_class[vclass];
400 if (vendor_class) {
401 if (is_vendor_method_in_use(
402 vendor_class,
403 mad_reg_req))
404 goto error4;
405 }
406 }
407 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
408 }
409 if (ret2) {
410 ret = ERR_PTR(ret2);
411 goto error4;
412 }
413 }
414
415 /* Add mad agent into port's agent list */
416 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
417 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
418
419 return &mad_agent_priv->agent;
420
421 error4:
422 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
423 kfree(reg_req);
424 error3:
425 kfree(mad_agent_priv);
426 error1:
427 return ret;
428 }
429 EXPORT_SYMBOL(ib_register_mad_agent);
430
431 static inline int is_snooping_sends(int mad_snoop_flags)
432 {
433 return (mad_snoop_flags &
434 (/*IB_MAD_SNOOP_POSTED_SENDS |
435 IB_MAD_SNOOP_RMPP_SENDS |*/
436 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
437 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
438 }
439
440 static inline int is_snooping_recvs(int mad_snoop_flags)
441 {
442 return (mad_snoop_flags &
443 (IB_MAD_SNOOP_RECVS /*|
444 IB_MAD_SNOOP_RMPP_RECVS*/));
445 }
446
447 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
448 struct ib_mad_snoop_private *mad_snoop_priv)
449 {
450 struct ib_mad_snoop_private **new_snoop_table;
451 unsigned long flags;
452 int i;
453
454 spin_lock_irqsave(&qp_info->snoop_lock, flags);
455 /* Check for empty slot in array. */
456 for (i = 0; i < qp_info->snoop_table_size; i++)
457 if (!qp_info->snoop_table[i])
458 break;
459
460 if (i == qp_info->snoop_table_size) {
461 /* Grow table. */
462 new_snoop_table = krealloc(qp_info->snoop_table,
463 sizeof mad_snoop_priv *
464 (qp_info->snoop_table_size + 1),
465 GFP_ATOMIC);
466 if (!new_snoop_table) {
467 i = -ENOMEM;
468 goto out;
469 }
470
471 qp_info->snoop_table = new_snoop_table;
472 qp_info->snoop_table_size++;
473 }
474 qp_info->snoop_table[i] = mad_snoop_priv;
475 atomic_inc(&qp_info->snoop_count);
476 out:
477 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
478 return i;
479 }
480
481 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
482 u8 port_num,
483 enum ib_qp_type qp_type,
484 int mad_snoop_flags,
485 ib_mad_snoop_handler snoop_handler,
486 ib_mad_recv_handler recv_handler,
487 void *context)
488 {
489 struct ib_mad_port_private *port_priv;
490 struct ib_mad_agent *ret;
491 struct ib_mad_snoop_private *mad_snoop_priv;
492 int qpn;
493
494 /* Validate parameters */
495 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
496 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
497 ret = ERR_PTR(-EINVAL);
498 goto error1;
499 }
500 qpn = get_spl_qp_index(qp_type);
501 if (qpn == -1) {
502 ret = ERR_PTR(-EINVAL);
503 goto error1;
504 }
505 port_priv = ib_get_mad_port(device, port_num);
506 if (!port_priv) {
507 ret = ERR_PTR(-ENODEV);
508 goto error1;
509 }
510 /* Allocate structures */
511 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
512 if (!mad_snoop_priv) {
513 ret = ERR_PTR(-ENOMEM);
514 goto error1;
515 }
516
517 /* Now, fill in the various structures */
518 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
519 mad_snoop_priv->agent.device = device;
520 mad_snoop_priv->agent.recv_handler = recv_handler;
521 mad_snoop_priv->agent.snoop_handler = snoop_handler;
522 mad_snoop_priv->agent.context = context;
523 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
524 mad_snoop_priv->agent.port_num = port_num;
525 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
526 init_completion(&mad_snoop_priv->comp);
527 mad_snoop_priv->snoop_index = register_snoop_agent(
528 &port_priv->qp_info[qpn],
529 mad_snoop_priv);
530 if (mad_snoop_priv->snoop_index < 0) {
531 ret = ERR_PTR(mad_snoop_priv->snoop_index);
532 goto error2;
533 }
534
535 atomic_set(&mad_snoop_priv->refcount, 1);
536 return &mad_snoop_priv->agent;
537
538 error2:
539 kfree(mad_snoop_priv);
540 error1:
541 return ret;
542 }
543 EXPORT_SYMBOL(ib_register_mad_snoop);
544
545 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
546 {
547 if (atomic_dec_and_test(&mad_agent_priv->refcount))
548 complete(&mad_agent_priv->comp);
549 }
550
551 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
552 {
553 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
554 complete(&mad_snoop_priv->comp);
555 }
556
557 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
558 {
559 struct ib_mad_port_private *port_priv;
560 unsigned long flags;
561
562 /* Note that we could still be handling received MADs */
563
564 /*
565 * Canceling all sends results in dropping received response
566 * MADs, preventing us from queuing additional work
567 */
568 cancel_mads(mad_agent_priv);
569 port_priv = mad_agent_priv->qp_info->port_priv;
570 cancel_delayed_work(&mad_agent_priv->timed_work);
571
572 spin_lock_irqsave(&port_priv->reg_lock, flags);
573 remove_mad_reg_req(mad_agent_priv);
574 list_del(&mad_agent_priv->agent_list);
575 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
576
577 flush_workqueue(port_priv->wq);
578 ib_cancel_rmpp_recvs(mad_agent_priv);
579
580 deref_mad_agent(mad_agent_priv);
581 wait_for_completion(&mad_agent_priv->comp);
582
583 kfree(mad_agent_priv->reg_req);
584 kfree(mad_agent_priv);
585 }
586
587 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
588 {
589 struct ib_mad_qp_info *qp_info;
590 unsigned long flags;
591
592 qp_info = mad_snoop_priv->qp_info;
593 spin_lock_irqsave(&qp_info->snoop_lock, flags);
594 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
595 atomic_dec(&qp_info->snoop_count);
596 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
597
598 deref_snoop_agent(mad_snoop_priv);
599 wait_for_completion(&mad_snoop_priv->comp);
600
601 kfree(mad_snoop_priv);
602 }
603
604 /*
605 * ib_unregister_mad_agent - Unregisters a client from using MAD services
606 */
607 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
608 {
609 struct ib_mad_agent_private *mad_agent_priv;
610 struct ib_mad_snoop_private *mad_snoop_priv;
611
612 /* If the TID is zero, the agent can only snoop. */
613 if (mad_agent->hi_tid) {
614 mad_agent_priv = container_of(mad_agent,
615 struct ib_mad_agent_private,
616 agent);
617 unregister_mad_agent(mad_agent_priv);
618 } else {
619 mad_snoop_priv = container_of(mad_agent,
620 struct ib_mad_snoop_private,
621 agent);
622 unregister_mad_snoop(mad_snoop_priv);
623 }
624 return 0;
625 }
626 EXPORT_SYMBOL(ib_unregister_mad_agent);
627
628 static void dequeue_mad(struct ib_mad_list_head *mad_list)
629 {
630 struct ib_mad_queue *mad_queue;
631 unsigned long flags;
632
633 BUG_ON(!mad_list->mad_queue);
634 mad_queue = mad_list->mad_queue;
635 spin_lock_irqsave(&mad_queue->lock, flags);
636 list_del(&mad_list->list);
637 mad_queue->count--;
638 spin_unlock_irqrestore(&mad_queue->lock, flags);
639 }
640
641 static void snoop_send(struct ib_mad_qp_info *qp_info,
642 struct ib_mad_send_buf *send_buf,
643 struct ib_mad_send_wc *mad_send_wc,
644 int mad_snoop_flags)
645 {
646 struct ib_mad_snoop_private *mad_snoop_priv;
647 unsigned long flags;
648 int i;
649
650 spin_lock_irqsave(&qp_info->snoop_lock, flags);
651 for (i = 0; i < qp_info->snoop_table_size; i++) {
652 mad_snoop_priv = qp_info->snoop_table[i];
653 if (!mad_snoop_priv ||
654 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
655 continue;
656
657 atomic_inc(&mad_snoop_priv->refcount);
658 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
659 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
660 send_buf, mad_send_wc);
661 deref_snoop_agent(mad_snoop_priv);
662 spin_lock_irqsave(&qp_info->snoop_lock, flags);
663 }
664 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
665 }
666
667 static void snoop_recv(struct ib_mad_qp_info *qp_info,
668 struct ib_mad_recv_wc *mad_recv_wc,
669 int mad_snoop_flags)
670 {
671 struct ib_mad_snoop_private *mad_snoop_priv;
672 unsigned long flags;
673 int i;
674
675 spin_lock_irqsave(&qp_info->snoop_lock, flags);
676 for (i = 0; i < qp_info->snoop_table_size; i++) {
677 mad_snoop_priv = qp_info->snoop_table[i];
678 if (!mad_snoop_priv ||
679 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
680 continue;
681
682 atomic_inc(&mad_snoop_priv->refcount);
683 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
684 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
685 mad_recv_wc);
686 deref_snoop_agent(mad_snoop_priv);
687 spin_lock_irqsave(&qp_info->snoop_lock, flags);
688 }
689 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
690 }
691
692 static void build_smp_wc(struct ib_qp *qp,
693 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
694 struct ib_wc *wc)
695 {
696 memset(wc, 0, sizeof *wc);
697 wc->wr_id = wr_id;
698 wc->status = IB_WC_SUCCESS;
699 wc->opcode = IB_WC_RECV;
700 wc->pkey_index = pkey_index;
701 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
702 wc->src_qp = IB_QP0;
703 wc->qp = qp;
704 wc->slid = slid;
705 wc->sl = 0;
706 wc->dlid_path_bits = 0;
707 wc->port_num = port_num;
708 }
709
710 static size_t mad_priv_size(const struct ib_mad_private *mp)
711 {
712 return sizeof(struct ib_mad_private) + mp->mad_size;
713 }
714
715 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
716 {
717 size_t size = sizeof(struct ib_mad_private) + mad_size;
718 struct ib_mad_private *ret = kzalloc(size, flags);
719
720 if (ret)
721 ret->mad_size = mad_size;
722
723 return ret;
724 }
725
726 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
727 {
728 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
729 }
730
731 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
732 {
733 return sizeof(struct ib_grh) + mp->mad_size;
734 }
735
736 /*
737 * Return 0 if SMP is to be sent
738 * Return 1 if SMP was consumed locally (whether or not solicited)
739 * Return < 0 if error
740 */
741 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
742 struct ib_mad_send_wr_private *mad_send_wr)
743 {
744 int ret = 0;
745 struct ib_smp *smp = mad_send_wr->send_buf.mad;
746 struct opa_smp *opa_smp = (struct opa_smp *)smp;
747 unsigned long flags;
748 struct ib_mad_local_private *local;
749 struct ib_mad_private *mad_priv;
750 struct ib_mad_port_private *port_priv;
751 struct ib_mad_agent_private *recv_mad_agent = NULL;
752 struct ib_device *device = mad_agent_priv->agent.device;
753 u8 port_num;
754 struct ib_wc mad_wc;
755 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
756 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
757 u16 out_mad_pkey_index = 0;
758 u16 drslid;
759 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
760 mad_agent_priv->qp_info->port_priv->port_num);
761
762 if (rdma_cap_ib_switch(device) &&
763 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
764 port_num = send_wr->port_num;
765 else
766 port_num = mad_agent_priv->agent.port_num;
767
768 /*
769 * Directed route handling starts if the initial LID routed part of
770 * a request or the ending LID routed part of a response is empty.
771 * If we are at the start of the LID routed part, don't update the
772 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
773 */
774 if (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
775 u32 opa_drslid;
776
777 if ((opa_get_smp_direction(opa_smp)
778 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
779 OPA_LID_PERMISSIVE &&
780 opa_smi_handle_dr_smp_send(opa_smp,
781 rdma_cap_ib_switch(device),
782 port_num) == IB_SMI_DISCARD) {
783 ret = -EINVAL;
784 dev_err(&device->dev, "OPA Invalid directed route\n");
785 goto out;
786 }
787 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
788 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
789 opa_drslid & 0xffff0000) {
790 ret = -EINVAL;
791 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
792 opa_drslid);
793 goto out;
794 }
795 drslid = (u16)(opa_drslid & 0x0000ffff);
796
797 /* Check to post send on QP or process locally */
798 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
799 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
800 goto out;
801 } else {
802 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
803 IB_LID_PERMISSIVE &&
804 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
805 IB_SMI_DISCARD) {
806 ret = -EINVAL;
807 dev_err(&device->dev, "Invalid directed route\n");
808 goto out;
809 }
810 drslid = be16_to_cpu(smp->dr_slid);
811
812 /* Check to post send on QP or process locally */
813 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
814 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
815 goto out;
816 }
817
818 local = kmalloc(sizeof *local, GFP_ATOMIC);
819 if (!local) {
820 ret = -ENOMEM;
821 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
822 goto out;
823 }
824 local->mad_priv = NULL;
825 local->recv_mad_agent = NULL;
826 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
827 if (!mad_priv) {
828 ret = -ENOMEM;
829 dev_err(&device->dev, "No memory for local response MAD\n");
830 kfree(local);
831 goto out;
832 }
833
834 build_smp_wc(mad_agent_priv->agent.qp,
835 send_wr->wr.wr_id, drslid,
836 send_wr->pkey_index,
837 send_wr->port_num, &mad_wc);
838
839 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
840 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
841 + mad_send_wr->send_buf.data_len
842 + sizeof(struct ib_grh);
843 }
844
845 /* No GRH for DR SMP */
846 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
847 (const struct ib_mad_hdr *)smp, mad_size,
848 (struct ib_mad_hdr *)mad_priv->mad,
849 &mad_size, &out_mad_pkey_index);
850 switch (ret)
851 {
852 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
853 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
854 mad_agent_priv->agent.recv_handler) {
855 local->mad_priv = mad_priv;
856 local->recv_mad_agent = mad_agent_priv;
857 /*
858 * Reference MAD agent until receive
859 * side of local completion handled
860 */
861 atomic_inc(&mad_agent_priv->refcount);
862 } else
863 kfree(mad_priv);
864 break;
865 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
866 kfree(mad_priv);
867 break;
868 case IB_MAD_RESULT_SUCCESS:
869 /* Treat like an incoming receive MAD */
870 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
871 mad_agent_priv->agent.port_num);
872 if (port_priv) {
873 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
874 recv_mad_agent = find_mad_agent(port_priv,
875 (const struct ib_mad_hdr *)mad_priv->mad);
876 }
877 if (!port_priv || !recv_mad_agent) {
878 /*
879 * No receiving agent so drop packet and
880 * generate send completion.
881 */
882 kfree(mad_priv);
883 break;
884 }
885 local->mad_priv = mad_priv;
886 local->recv_mad_agent = recv_mad_agent;
887 break;
888 default:
889 kfree(mad_priv);
890 kfree(local);
891 ret = -EINVAL;
892 goto out;
893 }
894
895 local->mad_send_wr = mad_send_wr;
896 if (opa) {
897 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
898 local->return_wc_byte_len = mad_size;
899 }
900 /* Reference MAD agent until send side of local completion handled */
901 atomic_inc(&mad_agent_priv->refcount);
902 /* Queue local completion to local list */
903 spin_lock_irqsave(&mad_agent_priv->lock, flags);
904 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
905 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
906 queue_work(mad_agent_priv->qp_info->port_priv->wq,
907 &mad_agent_priv->local_work);
908 ret = 1;
909 out:
910 return ret;
911 }
912
913 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
914 {
915 int seg_size, pad;
916
917 seg_size = mad_size - hdr_len;
918 if (data_len && seg_size) {
919 pad = seg_size - data_len % seg_size;
920 return pad == seg_size ? 0 : pad;
921 } else
922 return seg_size;
923 }
924
925 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
926 {
927 struct ib_rmpp_segment *s, *t;
928
929 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
930 list_del(&s->list);
931 kfree(s);
932 }
933 }
934
935 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
936 size_t mad_size, gfp_t gfp_mask)
937 {
938 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
939 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
940 struct ib_rmpp_segment *seg = NULL;
941 int left, seg_size, pad;
942
943 send_buf->seg_size = mad_size - send_buf->hdr_len;
944 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
945 seg_size = send_buf->seg_size;
946 pad = send_wr->pad;
947
948 /* Allocate data segments. */
949 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
950 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
951 if (!seg) {
952 dev_err(&send_buf->mad_agent->device->dev,
953 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
954 sizeof (*seg) + seg_size, gfp_mask);
955 free_send_rmpp_list(send_wr);
956 return -ENOMEM;
957 }
958 seg->num = ++send_buf->seg_count;
959 list_add_tail(&seg->list, &send_wr->rmpp_list);
960 }
961
962 /* Zero any padding */
963 if (pad)
964 memset(seg->data + seg_size - pad, 0, pad);
965
966 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
967 agent.rmpp_version;
968 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
969 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
970
971 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
972 struct ib_rmpp_segment, list);
973 send_wr->last_ack_seg = send_wr->cur_seg;
974 return 0;
975 }
976
977 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
978 {
979 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
980 }
981 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
982
983 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
984 u32 remote_qpn, u16 pkey_index,
985 int rmpp_active,
986 int hdr_len, int data_len,
987 gfp_t gfp_mask,
988 u8 base_version)
989 {
990 struct ib_mad_agent_private *mad_agent_priv;
991 struct ib_mad_send_wr_private *mad_send_wr;
992 int pad, message_size, ret, size;
993 void *buf;
994 size_t mad_size;
995 bool opa;
996
997 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
998 agent);
999
1000 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1001
1002 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1003 mad_size = sizeof(struct opa_mad);
1004 else
1005 mad_size = sizeof(struct ib_mad);
1006
1007 pad = get_pad_size(hdr_len, data_len, mad_size);
1008 message_size = hdr_len + data_len + pad;
1009
1010 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1011 if (!rmpp_active && message_size > mad_size)
1012 return ERR_PTR(-EINVAL);
1013 } else
1014 if (rmpp_active || message_size > mad_size)
1015 return ERR_PTR(-EINVAL);
1016
1017 size = rmpp_active ? hdr_len : mad_size;
1018 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1019 if (!buf)
1020 return ERR_PTR(-ENOMEM);
1021
1022 mad_send_wr = buf + size;
1023 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1024 mad_send_wr->send_buf.mad = buf;
1025 mad_send_wr->send_buf.hdr_len = hdr_len;
1026 mad_send_wr->send_buf.data_len = data_len;
1027 mad_send_wr->pad = pad;
1028
1029 mad_send_wr->mad_agent_priv = mad_agent_priv;
1030 mad_send_wr->sg_list[0].length = hdr_len;
1031 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1032
1033 /* OPA MADs don't have to be the full 2048 bytes */
1034 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1035 data_len < mad_size - hdr_len)
1036 mad_send_wr->sg_list[1].length = data_len;
1037 else
1038 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1039
1040 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1041
1042 mad_send_wr->send_wr.wr.wr_id = (unsigned long) mad_send_wr;
1043 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1044 mad_send_wr->send_wr.wr.num_sge = 2;
1045 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1046 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1047 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1048 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1049 mad_send_wr->send_wr.pkey_index = pkey_index;
1050
1051 if (rmpp_active) {
1052 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1053 if (ret) {
1054 kfree(buf);
1055 return ERR_PTR(ret);
1056 }
1057 }
1058
1059 mad_send_wr->send_buf.mad_agent = mad_agent;
1060 atomic_inc(&mad_agent_priv->refcount);
1061 return &mad_send_wr->send_buf;
1062 }
1063 EXPORT_SYMBOL(ib_create_send_mad);
1064
1065 int ib_get_mad_data_offset(u8 mgmt_class)
1066 {
1067 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1068 return IB_MGMT_SA_HDR;
1069 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1070 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1071 (mgmt_class == IB_MGMT_CLASS_BIS))
1072 return IB_MGMT_DEVICE_HDR;
1073 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1074 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1075 return IB_MGMT_VENDOR_HDR;
1076 else
1077 return IB_MGMT_MAD_HDR;
1078 }
1079 EXPORT_SYMBOL(ib_get_mad_data_offset);
1080
1081 int ib_is_mad_class_rmpp(u8 mgmt_class)
1082 {
1083 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1084 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1085 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1086 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1087 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1088 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1089 return 1;
1090 return 0;
1091 }
1092 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1093
1094 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1095 {
1096 struct ib_mad_send_wr_private *mad_send_wr;
1097 struct list_head *list;
1098
1099 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1100 send_buf);
1101 list = &mad_send_wr->cur_seg->list;
1102
1103 if (mad_send_wr->cur_seg->num < seg_num) {
1104 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1105 if (mad_send_wr->cur_seg->num == seg_num)
1106 break;
1107 } else if (mad_send_wr->cur_seg->num > seg_num) {
1108 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1109 if (mad_send_wr->cur_seg->num == seg_num)
1110 break;
1111 }
1112 return mad_send_wr->cur_seg->data;
1113 }
1114 EXPORT_SYMBOL(ib_get_rmpp_segment);
1115
1116 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1117 {
1118 if (mad_send_wr->send_buf.seg_count)
1119 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1120 mad_send_wr->seg_num);
1121 else
1122 return mad_send_wr->send_buf.mad +
1123 mad_send_wr->send_buf.hdr_len;
1124 }
1125
1126 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1127 {
1128 struct ib_mad_agent_private *mad_agent_priv;
1129 struct ib_mad_send_wr_private *mad_send_wr;
1130
1131 mad_agent_priv = container_of(send_buf->mad_agent,
1132 struct ib_mad_agent_private, agent);
1133 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1134 send_buf);
1135
1136 free_send_rmpp_list(mad_send_wr);
1137 kfree(send_buf->mad);
1138 deref_mad_agent(mad_agent_priv);
1139 }
1140 EXPORT_SYMBOL(ib_free_send_mad);
1141
1142 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1143 {
1144 struct ib_mad_qp_info *qp_info;
1145 struct list_head *list;
1146 struct ib_send_wr *bad_send_wr;
1147 struct ib_mad_agent *mad_agent;
1148 struct ib_sge *sge;
1149 unsigned long flags;
1150 int ret;
1151
1152 /* Set WR ID to find mad_send_wr upon completion */
1153 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1154 mad_send_wr->send_wr.wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1155 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1156
1157 mad_agent = mad_send_wr->send_buf.mad_agent;
1158 sge = mad_send_wr->sg_list;
1159 sge[0].addr = ib_dma_map_single(mad_agent->device,
1160 mad_send_wr->send_buf.mad,
1161 sge[0].length,
1162 DMA_TO_DEVICE);
1163 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1164 return -ENOMEM;
1165
1166 mad_send_wr->header_mapping = sge[0].addr;
1167
1168 sge[1].addr = ib_dma_map_single(mad_agent->device,
1169 ib_get_payload(mad_send_wr),
1170 sge[1].length,
1171 DMA_TO_DEVICE);
1172 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1173 ib_dma_unmap_single(mad_agent->device,
1174 mad_send_wr->header_mapping,
1175 sge[0].length, DMA_TO_DEVICE);
1176 return -ENOMEM;
1177 }
1178 mad_send_wr->payload_mapping = sge[1].addr;
1179
1180 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1181 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1182 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1183 &bad_send_wr);
1184 list = &qp_info->send_queue.list;
1185 } else {
1186 ret = 0;
1187 list = &qp_info->overflow_list;
1188 }
1189
1190 if (!ret) {
1191 qp_info->send_queue.count++;
1192 list_add_tail(&mad_send_wr->mad_list.list, list);
1193 }
1194 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1195 if (ret) {
1196 ib_dma_unmap_single(mad_agent->device,
1197 mad_send_wr->header_mapping,
1198 sge[0].length, DMA_TO_DEVICE);
1199 ib_dma_unmap_single(mad_agent->device,
1200 mad_send_wr->payload_mapping,
1201 sge[1].length, DMA_TO_DEVICE);
1202 }
1203 return ret;
1204 }
1205
1206 /*
1207 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1208 * with the registered client
1209 */
1210 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1211 struct ib_mad_send_buf **bad_send_buf)
1212 {
1213 struct ib_mad_agent_private *mad_agent_priv;
1214 struct ib_mad_send_buf *next_send_buf;
1215 struct ib_mad_send_wr_private *mad_send_wr;
1216 unsigned long flags;
1217 int ret = -EINVAL;
1218
1219 /* Walk list of send WRs and post each on send list */
1220 for (; send_buf; send_buf = next_send_buf) {
1221
1222 mad_send_wr = container_of(send_buf,
1223 struct ib_mad_send_wr_private,
1224 send_buf);
1225 mad_agent_priv = mad_send_wr->mad_agent_priv;
1226
1227 if (!send_buf->mad_agent->send_handler ||
1228 (send_buf->timeout_ms &&
1229 !send_buf->mad_agent->recv_handler)) {
1230 ret = -EINVAL;
1231 goto error;
1232 }
1233
1234 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1235 if (mad_agent_priv->agent.rmpp_version) {
1236 ret = -EINVAL;
1237 goto error;
1238 }
1239 }
1240
1241 /*
1242 * Save pointer to next work request to post in case the
1243 * current one completes, and the user modifies the work
1244 * request associated with the completion
1245 */
1246 next_send_buf = send_buf->next;
1247 mad_send_wr->send_wr.ah = send_buf->ah;
1248
1249 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1250 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1251 ret = handle_outgoing_dr_smp(mad_agent_priv,
1252 mad_send_wr);
1253 if (ret < 0) /* error */
1254 goto error;
1255 else if (ret == 1) /* locally consumed */
1256 continue;
1257 }
1258
1259 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1260 /* Timeout will be updated after send completes */
1261 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1262 mad_send_wr->max_retries = send_buf->retries;
1263 mad_send_wr->retries_left = send_buf->retries;
1264 send_buf->retries = 0;
1265 /* Reference for work request to QP + response */
1266 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1267 mad_send_wr->status = IB_WC_SUCCESS;
1268
1269 /* Reference MAD agent until send completes */
1270 atomic_inc(&mad_agent_priv->refcount);
1271 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1272 list_add_tail(&mad_send_wr->agent_list,
1273 &mad_agent_priv->send_list);
1274 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1275
1276 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1277 ret = ib_send_rmpp_mad(mad_send_wr);
1278 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1279 ret = ib_send_mad(mad_send_wr);
1280 } else
1281 ret = ib_send_mad(mad_send_wr);
1282 if (ret < 0) {
1283 /* Fail send request */
1284 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1285 list_del(&mad_send_wr->agent_list);
1286 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1287 atomic_dec(&mad_agent_priv->refcount);
1288 goto error;
1289 }
1290 }
1291 return 0;
1292 error:
1293 if (bad_send_buf)
1294 *bad_send_buf = send_buf;
1295 return ret;
1296 }
1297 EXPORT_SYMBOL(ib_post_send_mad);
1298
1299 /*
1300 * ib_free_recv_mad - Returns data buffers used to receive
1301 * a MAD to the access layer
1302 */
1303 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1304 {
1305 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1306 struct ib_mad_private_header *mad_priv_hdr;
1307 struct ib_mad_private *priv;
1308 struct list_head free_list;
1309
1310 INIT_LIST_HEAD(&free_list);
1311 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1312
1313 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1314 &free_list, list) {
1315 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1316 recv_buf);
1317 mad_priv_hdr = container_of(mad_recv_wc,
1318 struct ib_mad_private_header,
1319 recv_wc);
1320 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1321 header);
1322 kfree(priv);
1323 }
1324 }
1325 EXPORT_SYMBOL(ib_free_recv_mad);
1326
1327 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1328 u8 rmpp_version,
1329 ib_mad_send_handler send_handler,
1330 ib_mad_recv_handler recv_handler,
1331 void *context)
1332 {
1333 return ERR_PTR(-EINVAL); /* XXX: for now */
1334 }
1335 EXPORT_SYMBOL(ib_redirect_mad_qp);
1336
1337 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1338 struct ib_wc *wc)
1339 {
1340 dev_err(&mad_agent->device->dev,
1341 "ib_process_mad_wc() not implemented yet\n");
1342 return 0;
1343 }
1344 EXPORT_SYMBOL(ib_process_mad_wc);
1345
1346 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1347 struct ib_mad_reg_req *mad_reg_req)
1348 {
1349 int i;
1350
1351 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1352 if ((*method)->agent[i]) {
1353 pr_err("Method %d already in use\n", i);
1354 return -EINVAL;
1355 }
1356 }
1357 return 0;
1358 }
1359
1360 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1361 {
1362 /* Allocate management method table */
1363 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1364 if (!*method) {
1365 pr_err("No memory for ib_mad_mgmt_method_table\n");
1366 return -ENOMEM;
1367 }
1368
1369 return 0;
1370 }
1371
1372 /*
1373 * Check to see if there are any methods still in use
1374 */
1375 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1376 {
1377 int i;
1378
1379 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1380 if (method->agent[i])
1381 return 1;
1382 return 0;
1383 }
1384
1385 /*
1386 * Check to see if there are any method tables for this class still in use
1387 */
1388 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1389 {
1390 int i;
1391
1392 for (i = 0; i < MAX_MGMT_CLASS; i++)
1393 if (class->method_table[i])
1394 return 1;
1395 return 0;
1396 }
1397
1398 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1399 {
1400 int i;
1401
1402 for (i = 0; i < MAX_MGMT_OUI; i++)
1403 if (vendor_class->method_table[i])
1404 return 1;
1405 return 0;
1406 }
1407
1408 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1409 const char *oui)
1410 {
1411 int i;
1412
1413 for (i = 0; i < MAX_MGMT_OUI; i++)
1414 /* Is there matching OUI for this vendor class ? */
1415 if (!memcmp(vendor_class->oui[i], oui, 3))
1416 return i;
1417
1418 return -1;
1419 }
1420
1421 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1422 {
1423 int i;
1424
1425 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1426 if (vendor->vendor_class[i])
1427 return 1;
1428
1429 return 0;
1430 }
1431
1432 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1433 struct ib_mad_agent_private *agent)
1434 {
1435 int i;
1436
1437 /* Remove any methods for this mad agent */
1438 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1439 if (method->agent[i] == agent) {
1440 method->agent[i] = NULL;
1441 }
1442 }
1443 }
1444
1445 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1446 struct ib_mad_agent_private *agent_priv,
1447 u8 mgmt_class)
1448 {
1449 struct ib_mad_port_private *port_priv;
1450 struct ib_mad_mgmt_class_table **class;
1451 struct ib_mad_mgmt_method_table **method;
1452 int i, ret;
1453
1454 port_priv = agent_priv->qp_info->port_priv;
1455 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1456 if (!*class) {
1457 /* Allocate management class table for "new" class version */
1458 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1459 if (!*class) {
1460 dev_err(&agent_priv->agent.device->dev,
1461 "No memory for ib_mad_mgmt_class_table\n");
1462 ret = -ENOMEM;
1463 goto error1;
1464 }
1465
1466 /* Allocate method table for this management class */
1467 method = &(*class)->method_table[mgmt_class];
1468 if ((ret = allocate_method_table(method)))
1469 goto error2;
1470 } else {
1471 method = &(*class)->method_table[mgmt_class];
1472 if (!*method) {
1473 /* Allocate method table for this management class */
1474 if ((ret = allocate_method_table(method)))
1475 goto error1;
1476 }
1477 }
1478
1479 /* Now, make sure methods are not already in use */
1480 if (method_in_use(method, mad_reg_req))
1481 goto error3;
1482
1483 /* Finally, add in methods being registered */
1484 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1485 (*method)->agent[i] = agent_priv;
1486
1487 return 0;
1488
1489 error3:
1490 /* Remove any methods for this mad agent */
1491 remove_methods_mad_agent(*method, agent_priv);
1492 /* Now, check to see if there are any methods in use */
1493 if (!check_method_table(*method)) {
1494 /* If not, release management method table */
1495 kfree(*method);
1496 *method = NULL;
1497 }
1498 ret = -EINVAL;
1499 goto error1;
1500 error2:
1501 kfree(*class);
1502 *class = NULL;
1503 error1:
1504 return ret;
1505 }
1506
1507 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1508 struct ib_mad_agent_private *agent_priv)
1509 {
1510 struct ib_mad_port_private *port_priv;
1511 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1512 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1513 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1514 struct ib_mad_mgmt_method_table **method;
1515 int i, ret = -ENOMEM;
1516 u8 vclass;
1517
1518 /* "New" vendor (with OUI) class */
1519 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1520 port_priv = agent_priv->qp_info->port_priv;
1521 vendor_table = &port_priv->version[
1522 mad_reg_req->mgmt_class_version].vendor;
1523 if (!*vendor_table) {
1524 /* Allocate mgmt vendor class table for "new" class version */
1525 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1526 if (!vendor) {
1527 dev_err(&agent_priv->agent.device->dev,
1528 "No memory for ib_mad_mgmt_vendor_class_table\n");
1529 goto error1;
1530 }
1531
1532 *vendor_table = vendor;
1533 }
1534 if (!(*vendor_table)->vendor_class[vclass]) {
1535 /* Allocate table for this management vendor class */
1536 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1537 if (!vendor_class) {
1538 dev_err(&agent_priv->agent.device->dev,
1539 "No memory for ib_mad_mgmt_vendor_class\n");
1540 goto error2;
1541 }
1542
1543 (*vendor_table)->vendor_class[vclass] = vendor_class;
1544 }
1545 for (i = 0; i < MAX_MGMT_OUI; i++) {
1546 /* Is there matching OUI for this vendor class ? */
1547 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1548 mad_reg_req->oui, 3)) {
1549 method = &(*vendor_table)->vendor_class[
1550 vclass]->method_table[i];
1551 BUG_ON(!*method);
1552 goto check_in_use;
1553 }
1554 }
1555 for (i = 0; i < MAX_MGMT_OUI; i++) {
1556 /* OUI slot available ? */
1557 if (!is_vendor_oui((*vendor_table)->vendor_class[
1558 vclass]->oui[i])) {
1559 method = &(*vendor_table)->vendor_class[
1560 vclass]->method_table[i];
1561 BUG_ON(*method);
1562 /* Allocate method table for this OUI */
1563 if ((ret = allocate_method_table(method)))
1564 goto error3;
1565 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1566 mad_reg_req->oui, 3);
1567 goto check_in_use;
1568 }
1569 }
1570 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1571 goto error3;
1572
1573 check_in_use:
1574 /* Now, make sure methods are not already in use */
1575 if (method_in_use(method, mad_reg_req))
1576 goto error4;
1577
1578 /* Finally, add in methods being registered */
1579 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1580 (*method)->agent[i] = agent_priv;
1581
1582 return 0;
1583
1584 error4:
1585 /* Remove any methods for this mad agent */
1586 remove_methods_mad_agent(*method, agent_priv);
1587 /* Now, check to see if there are any methods in use */
1588 if (!check_method_table(*method)) {
1589 /* If not, release management method table */
1590 kfree(*method);
1591 *method = NULL;
1592 }
1593 ret = -EINVAL;
1594 error3:
1595 if (vendor_class) {
1596 (*vendor_table)->vendor_class[vclass] = NULL;
1597 kfree(vendor_class);
1598 }
1599 error2:
1600 if (vendor) {
1601 *vendor_table = NULL;
1602 kfree(vendor);
1603 }
1604 error1:
1605 return ret;
1606 }
1607
1608 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1609 {
1610 struct ib_mad_port_private *port_priv;
1611 struct ib_mad_mgmt_class_table *class;
1612 struct ib_mad_mgmt_method_table *method;
1613 struct ib_mad_mgmt_vendor_class_table *vendor;
1614 struct ib_mad_mgmt_vendor_class *vendor_class;
1615 int index;
1616 u8 mgmt_class;
1617
1618 /*
1619 * Was MAD registration request supplied
1620 * with original registration ?
1621 */
1622 if (!agent_priv->reg_req) {
1623 goto out;
1624 }
1625
1626 port_priv = agent_priv->qp_info->port_priv;
1627 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1628 class = port_priv->version[
1629 agent_priv->reg_req->mgmt_class_version].class;
1630 if (!class)
1631 goto vendor_check;
1632
1633 method = class->method_table[mgmt_class];
1634 if (method) {
1635 /* Remove any methods for this mad agent */
1636 remove_methods_mad_agent(method, agent_priv);
1637 /* Now, check to see if there are any methods still in use */
1638 if (!check_method_table(method)) {
1639 /* If not, release management method table */
1640 kfree(method);
1641 class->method_table[mgmt_class] = NULL;
1642 /* Any management classes left ? */
1643 if (!check_class_table(class)) {
1644 /* If not, release management class table */
1645 kfree(class);
1646 port_priv->version[
1647 agent_priv->reg_req->
1648 mgmt_class_version].class = NULL;
1649 }
1650 }
1651 }
1652
1653 vendor_check:
1654 if (!is_vendor_class(mgmt_class))
1655 goto out;
1656
1657 /* normalize mgmt_class to vendor range 2 */
1658 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1659 vendor = port_priv->version[
1660 agent_priv->reg_req->mgmt_class_version].vendor;
1661
1662 if (!vendor)
1663 goto out;
1664
1665 vendor_class = vendor->vendor_class[mgmt_class];
1666 if (vendor_class) {
1667 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1668 if (index < 0)
1669 goto out;
1670 method = vendor_class->method_table[index];
1671 if (method) {
1672 /* Remove any methods for this mad agent */
1673 remove_methods_mad_agent(method, agent_priv);
1674 /*
1675 * Now, check to see if there are
1676 * any methods still in use
1677 */
1678 if (!check_method_table(method)) {
1679 /* If not, release management method table */
1680 kfree(method);
1681 vendor_class->method_table[index] = NULL;
1682 memset(vendor_class->oui[index], 0, 3);
1683 /* Any OUIs left ? */
1684 if (!check_vendor_class(vendor_class)) {
1685 /* If not, release vendor class table */
1686 kfree(vendor_class);
1687 vendor->vendor_class[mgmt_class] = NULL;
1688 /* Any other vendor classes left ? */
1689 if (!check_vendor_table(vendor)) {
1690 kfree(vendor);
1691 port_priv->version[
1692 agent_priv->reg_req->
1693 mgmt_class_version].
1694 vendor = NULL;
1695 }
1696 }
1697 }
1698 }
1699 }
1700
1701 out:
1702 return;
1703 }
1704
1705 static struct ib_mad_agent_private *
1706 find_mad_agent(struct ib_mad_port_private *port_priv,
1707 const struct ib_mad_hdr *mad_hdr)
1708 {
1709 struct ib_mad_agent_private *mad_agent = NULL;
1710 unsigned long flags;
1711
1712 spin_lock_irqsave(&port_priv->reg_lock, flags);
1713 if (ib_response_mad(mad_hdr)) {
1714 u32 hi_tid;
1715 struct ib_mad_agent_private *entry;
1716
1717 /*
1718 * Routing is based on high 32 bits of transaction ID
1719 * of MAD.
1720 */
1721 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1722 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1723 if (entry->agent.hi_tid == hi_tid) {
1724 mad_agent = entry;
1725 break;
1726 }
1727 }
1728 } else {
1729 struct ib_mad_mgmt_class_table *class;
1730 struct ib_mad_mgmt_method_table *method;
1731 struct ib_mad_mgmt_vendor_class_table *vendor;
1732 struct ib_mad_mgmt_vendor_class *vendor_class;
1733 const struct ib_vendor_mad *vendor_mad;
1734 int index;
1735
1736 /*
1737 * Routing is based on version, class, and method
1738 * For "newer" vendor MADs, also based on OUI
1739 */
1740 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1741 goto out;
1742 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1743 class = port_priv->version[
1744 mad_hdr->class_version].class;
1745 if (!class)
1746 goto out;
1747 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1748 IB_MGMT_MAX_METHODS)
1749 goto out;
1750 method = class->method_table[convert_mgmt_class(
1751 mad_hdr->mgmt_class)];
1752 if (method)
1753 mad_agent = method->agent[mad_hdr->method &
1754 ~IB_MGMT_METHOD_RESP];
1755 } else {
1756 vendor = port_priv->version[
1757 mad_hdr->class_version].vendor;
1758 if (!vendor)
1759 goto out;
1760 vendor_class = vendor->vendor_class[vendor_class_index(
1761 mad_hdr->mgmt_class)];
1762 if (!vendor_class)
1763 goto out;
1764 /* Find matching OUI */
1765 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1766 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1767 if (index == -1)
1768 goto out;
1769 method = vendor_class->method_table[index];
1770 if (method) {
1771 mad_agent = method->agent[mad_hdr->method &
1772 ~IB_MGMT_METHOD_RESP];
1773 }
1774 }
1775 }
1776
1777 if (mad_agent) {
1778 if (mad_agent->agent.recv_handler)
1779 atomic_inc(&mad_agent->refcount);
1780 else {
1781 dev_notice(&port_priv->device->dev,
1782 "No receive handler for client %p on port %d\n",
1783 &mad_agent->agent, port_priv->port_num);
1784 mad_agent = NULL;
1785 }
1786 }
1787 out:
1788 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1789
1790 return mad_agent;
1791 }
1792
1793 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1794 const struct ib_mad_qp_info *qp_info,
1795 bool opa)
1796 {
1797 int valid = 0;
1798 u32 qp_num = qp_info->qp->qp_num;
1799
1800 /* Make sure MAD base version is understood */
1801 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1802 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1803 pr_err("MAD received with unsupported base version %d %s\n",
1804 mad_hdr->base_version, opa ? "(opa)" : "");
1805 goto out;
1806 }
1807
1808 /* Filter SMI packets sent to other than QP0 */
1809 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1810 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1811 if (qp_num == 0)
1812 valid = 1;
1813 } else {
1814 /* CM attributes other than ClassPortInfo only use Send method */
1815 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1816 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1817 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1818 goto out;
1819 /* Filter GSI packets sent to QP0 */
1820 if (qp_num != 0)
1821 valid = 1;
1822 }
1823
1824 out:
1825 return valid;
1826 }
1827
1828 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1829 const struct ib_mad_hdr *mad_hdr)
1830 {
1831 struct ib_rmpp_mad *rmpp_mad;
1832
1833 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1834 return !mad_agent_priv->agent.rmpp_version ||
1835 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1836 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1837 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1838 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1839 }
1840
1841 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1842 const struct ib_mad_recv_wc *rwc)
1843 {
1844 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1845 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1846 }
1847
1848 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1849 const struct ib_mad_send_wr_private *wr,
1850 const struct ib_mad_recv_wc *rwc )
1851 {
1852 struct ib_ah_attr attr;
1853 u8 send_resp, rcv_resp;
1854 union ib_gid sgid;
1855 struct ib_device *device = mad_agent_priv->agent.device;
1856 u8 port_num = mad_agent_priv->agent.port_num;
1857 u8 lmc;
1858
1859 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1860 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1861
1862 if (send_resp == rcv_resp)
1863 /* both requests, or both responses. GIDs different */
1864 return 0;
1865
1866 if (ib_query_ah(wr->send_buf.ah, &attr))
1867 /* Assume not equal, to avoid false positives. */
1868 return 0;
1869
1870 if (!!(attr.ah_flags & IB_AH_GRH) !=
1871 !!(rwc->wc->wc_flags & IB_WC_GRH))
1872 /* one has GID, other does not. Assume different */
1873 return 0;
1874
1875 if (!send_resp && rcv_resp) {
1876 /* is request/response. */
1877 if (!(attr.ah_flags & IB_AH_GRH)) {
1878 if (ib_get_cached_lmc(device, port_num, &lmc))
1879 return 0;
1880 return (!lmc || !((attr.src_path_bits ^
1881 rwc->wc->dlid_path_bits) &
1882 ((1 << lmc) - 1)));
1883 } else {
1884 if (ib_get_cached_gid(device, port_num,
1885 attr.grh.sgid_index, &sgid, NULL))
1886 return 0;
1887 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1888 16);
1889 }
1890 }
1891
1892 if (!(attr.ah_flags & IB_AH_GRH))
1893 return attr.dlid == rwc->wc->slid;
1894 else
1895 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1896 16);
1897 }
1898
1899 static inline int is_direct(u8 class)
1900 {
1901 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1902 }
1903
1904 struct ib_mad_send_wr_private*
1905 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1906 const struct ib_mad_recv_wc *wc)
1907 {
1908 struct ib_mad_send_wr_private *wr;
1909 const struct ib_mad_hdr *mad_hdr;
1910
1911 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1912
1913 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1914 if ((wr->tid == mad_hdr->tid) &&
1915 rcv_has_same_class(wr, wc) &&
1916 /*
1917 * Don't check GID for direct routed MADs.
1918 * These might have permissive LIDs.
1919 */
1920 (is_direct(mad_hdr->mgmt_class) ||
1921 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1922 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1923 }
1924
1925 /*
1926 * It's possible to receive the response before we've
1927 * been notified that the send has completed
1928 */
1929 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1930 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1931 wr->tid == mad_hdr->tid &&
1932 wr->timeout &&
1933 rcv_has_same_class(wr, wc) &&
1934 /*
1935 * Don't check GID for direct routed MADs.
1936 * These might have permissive LIDs.
1937 */
1938 (is_direct(mad_hdr->mgmt_class) ||
1939 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1940 /* Verify request has not been canceled */
1941 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1942 }
1943 return NULL;
1944 }
1945
1946 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1947 {
1948 mad_send_wr->timeout = 0;
1949 if (mad_send_wr->refcount == 1)
1950 list_move_tail(&mad_send_wr->agent_list,
1951 &mad_send_wr->mad_agent_priv->done_list);
1952 }
1953
1954 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1955 struct ib_mad_recv_wc *mad_recv_wc)
1956 {
1957 struct ib_mad_send_wr_private *mad_send_wr;
1958 struct ib_mad_send_wc mad_send_wc;
1959 unsigned long flags;
1960
1961 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1962 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1963 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1964 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1965 mad_recv_wc);
1966 if (!mad_recv_wc) {
1967 deref_mad_agent(mad_agent_priv);
1968 return;
1969 }
1970 }
1971
1972 /* Complete corresponding request */
1973 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1974 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1975 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1976 if (!mad_send_wr) {
1977 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1978 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1979 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1980 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1981 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1982 /* user rmpp is in effect
1983 * and this is an active RMPP MAD
1984 */
1985 mad_recv_wc->wc->wr_id = 0;
1986 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1987 mad_recv_wc);
1988 atomic_dec(&mad_agent_priv->refcount);
1989 } else {
1990 /* not user rmpp, revert to normal behavior and
1991 * drop the mad */
1992 ib_free_recv_mad(mad_recv_wc);
1993 deref_mad_agent(mad_agent_priv);
1994 return;
1995 }
1996 } else {
1997 ib_mark_mad_done(mad_send_wr);
1998 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1999
2000 /* Defined behavior is to complete response before request */
2001 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
2002 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2003 mad_recv_wc);
2004 atomic_dec(&mad_agent_priv->refcount);
2005
2006 mad_send_wc.status = IB_WC_SUCCESS;
2007 mad_send_wc.vendor_err = 0;
2008 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2009 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2010 }
2011 } else {
2012 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2013 mad_recv_wc);
2014 deref_mad_agent(mad_agent_priv);
2015 }
2016 }
2017
2018 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2019 const struct ib_mad_qp_info *qp_info,
2020 const struct ib_wc *wc,
2021 int port_num,
2022 struct ib_mad_private *recv,
2023 struct ib_mad_private *response)
2024 {
2025 enum smi_forward_action retsmi;
2026 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2027
2028 if (smi_handle_dr_smp_recv(smp,
2029 rdma_cap_ib_switch(port_priv->device),
2030 port_num,
2031 port_priv->device->phys_port_cnt) ==
2032 IB_SMI_DISCARD)
2033 return IB_SMI_DISCARD;
2034
2035 retsmi = smi_check_forward_dr_smp(smp);
2036 if (retsmi == IB_SMI_LOCAL)
2037 return IB_SMI_HANDLE;
2038
2039 if (retsmi == IB_SMI_SEND) { /* don't forward */
2040 if (smi_handle_dr_smp_send(smp,
2041 rdma_cap_ib_switch(port_priv->device),
2042 port_num) == IB_SMI_DISCARD)
2043 return IB_SMI_DISCARD;
2044
2045 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2046 return IB_SMI_DISCARD;
2047 } else if (rdma_cap_ib_switch(port_priv->device)) {
2048 /* forward case for switches */
2049 memcpy(response, recv, mad_priv_size(response));
2050 response->header.recv_wc.wc = &response->header.wc;
2051 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2052 response->header.recv_wc.recv_buf.grh = &response->grh;
2053
2054 agent_send_response((const struct ib_mad_hdr *)response->mad,
2055 &response->grh, wc,
2056 port_priv->device,
2057 smi_get_fwd_port(smp),
2058 qp_info->qp->qp_num,
2059 response->mad_size,
2060 false);
2061
2062 return IB_SMI_DISCARD;
2063 }
2064 return IB_SMI_HANDLE;
2065 }
2066
2067 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2068 struct ib_mad_private *response,
2069 size_t *resp_len, bool opa)
2070 {
2071 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2072 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2073
2074 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2075 recv_hdr->method == IB_MGMT_METHOD_SET) {
2076 memcpy(response, recv, mad_priv_size(response));
2077 response->header.recv_wc.wc = &response->header.wc;
2078 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2079 response->header.recv_wc.recv_buf.grh = &response->grh;
2080 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2081 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2082 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2083 resp_hdr->status |= IB_SMP_DIRECTION;
2084
2085 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2086 if (recv_hdr->mgmt_class ==
2087 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2088 recv_hdr->mgmt_class ==
2089 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2090 *resp_len = opa_get_smp_header_size(
2091 (struct opa_smp *)recv->mad);
2092 else
2093 *resp_len = sizeof(struct ib_mad_hdr);
2094 }
2095
2096 return true;
2097 } else {
2098 return false;
2099 }
2100 }
2101
2102 static enum smi_action
2103 handle_opa_smi(struct ib_mad_port_private *port_priv,
2104 struct ib_mad_qp_info *qp_info,
2105 struct ib_wc *wc,
2106 int port_num,
2107 struct ib_mad_private *recv,
2108 struct ib_mad_private *response)
2109 {
2110 enum smi_forward_action retsmi;
2111 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2112
2113 if (opa_smi_handle_dr_smp_recv(smp,
2114 rdma_cap_ib_switch(port_priv->device),
2115 port_num,
2116 port_priv->device->phys_port_cnt) ==
2117 IB_SMI_DISCARD)
2118 return IB_SMI_DISCARD;
2119
2120 retsmi = opa_smi_check_forward_dr_smp(smp);
2121 if (retsmi == IB_SMI_LOCAL)
2122 return IB_SMI_HANDLE;
2123
2124 if (retsmi == IB_SMI_SEND) { /* don't forward */
2125 if (opa_smi_handle_dr_smp_send(smp,
2126 rdma_cap_ib_switch(port_priv->device),
2127 port_num) == IB_SMI_DISCARD)
2128 return IB_SMI_DISCARD;
2129
2130 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2131 IB_SMI_DISCARD)
2132 return IB_SMI_DISCARD;
2133
2134 } else if (rdma_cap_ib_switch(port_priv->device)) {
2135 /* forward case for switches */
2136 memcpy(response, recv, mad_priv_size(response));
2137 response->header.recv_wc.wc = &response->header.wc;
2138 response->header.recv_wc.recv_buf.opa_mad =
2139 (struct opa_mad *)response->mad;
2140 response->header.recv_wc.recv_buf.grh = &response->grh;
2141
2142 agent_send_response((const struct ib_mad_hdr *)response->mad,
2143 &response->grh, wc,
2144 port_priv->device,
2145 opa_smi_get_fwd_port(smp),
2146 qp_info->qp->qp_num,
2147 recv->header.wc.byte_len,
2148 true);
2149
2150 return IB_SMI_DISCARD;
2151 }
2152
2153 return IB_SMI_HANDLE;
2154 }
2155
2156 static enum smi_action
2157 handle_smi(struct ib_mad_port_private *port_priv,
2158 struct ib_mad_qp_info *qp_info,
2159 struct ib_wc *wc,
2160 int port_num,
2161 struct ib_mad_private *recv,
2162 struct ib_mad_private *response,
2163 bool opa)
2164 {
2165 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2166
2167 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2168 mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
2169 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2170 response);
2171
2172 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2173 }
2174
2175 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
2176 struct ib_wc *wc)
2177 {
2178 struct ib_mad_qp_info *qp_info;
2179 struct ib_mad_private_header *mad_priv_hdr;
2180 struct ib_mad_private *recv, *response = NULL;
2181 struct ib_mad_list_head *mad_list;
2182 struct ib_mad_agent_private *mad_agent;
2183 int port_num;
2184 int ret = IB_MAD_RESULT_SUCCESS;
2185 size_t mad_size;
2186 u16 resp_mad_pkey_index = 0;
2187 bool opa;
2188
2189 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2190 qp_info = mad_list->mad_queue->qp_info;
2191 dequeue_mad(mad_list);
2192
2193 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2194 qp_info->port_priv->port_num);
2195
2196 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2197 mad_list);
2198 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2199 ib_dma_unmap_single(port_priv->device,
2200 recv->header.mapping,
2201 mad_priv_dma_size(recv),
2202 DMA_FROM_DEVICE);
2203
2204 /* Setup MAD receive work completion from "normal" work completion */
2205 recv->header.wc = *wc;
2206 recv->header.recv_wc.wc = &recv->header.wc;
2207
2208 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2209 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2210 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2211 } else {
2212 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2213 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2214 }
2215
2216 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2217 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2218
2219 if (atomic_read(&qp_info->snoop_count))
2220 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2221
2222 /* Validate MAD */
2223 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2224 goto out;
2225
2226 mad_size = recv->mad_size;
2227 response = alloc_mad_private(mad_size, GFP_KERNEL);
2228 if (!response) {
2229 dev_err(&port_priv->device->dev,
2230 "ib_mad_recv_done_handler no memory for response buffer\n");
2231 goto out;
2232 }
2233
2234 if (rdma_cap_ib_switch(port_priv->device))
2235 port_num = wc->port_num;
2236 else
2237 port_num = port_priv->port_num;
2238
2239 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2240 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2241 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2242 response, opa)
2243 == IB_SMI_DISCARD)
2244 goto out;
2245 }
2246
2247 /* Give driver "right of first refusal" on incoming MAD */
2248 if (port_priv->device->process_mad) {
2249 ret = port_priv->device->process_mad(port_priv->device, 0,
2250 port_priv->port_num,
2251 wc, &recv->grh,
2252 (const struct ib_mad_hdr *)recv->mad,
2253 recv->mad_size,
2254 (struct ib_mad_hdr *)response->mad,
2255 &mad_size, &resp_mad_pkey_index);
2256
2257 if (opa)
2258 wc->pkey_index = resp_mad_pkey_index;
2259
2260 if (ret & IB_MAD_RESULT_SUCCESS) {
2261 if (ret & IB_MAD_RESULT_CONSUMED)
2262 goto out;
2263 if (ret & IB_MAD_RESULT_REPLY) {
2264 agent_send_response((const struct ib_mad_hdr *)response->mad,
2265 &recv->grh, wc,
2266 port_priv->device,
2267 port_num,
2268 qp_info->qp->qp_num,
2269 mad_size, opa);
2270 goto out;
2271 }
2272 }
2273 }
2274
2275 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2276 if (mad_agent) {
2277 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2278 /*
2279 * recv is freed up in error cases in ib_mad_complete_recv
2280 * or via recv_handler in ib_mad_complete_recv()
2281 */
2282 recv = NULL;
2283 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2284 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2285 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2286 port_priv->device, port_num,
2287 qp_info->qp->qp_num, mad_size, opa);
2288 }
2289
2290 out:
2291 /* Post another receive request for this QP */
2292 if (response) {
2293 ib_mad_post_receive_mads(qp_info, response);
2294 kfree(recv);
2295 } else
2296 ib_mad_post_receive_mads(qp_info, recv);
2297 }
2298
2299 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2300 {
2301 struct ib_mad_send_wr_private *mad_send_wr;
2302 unsigned long delay;
2303
2304 if (list_empty(&mad_agent_priv->wait_list)) {
2305 cancel_delayed_work(&mad_agent_priv->timed_work);
2306 } else {
2307 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2308 struct ib_mad_send_wr_private,
2309 agent_list);
2310
2311 if (time_after(mad_agent_priv->timeout,
2312 mad_send_wr->timeout)) {
2313 mad_agent_priv->timeout = mad_send_wr->timeout;
2314 delay = mad_send_wr->timeout - jiffies;
2315 if ((long)delay <= 0)
2316 delay = 1;
2317 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2318 &mad_agent_priv->timed_work, delay);
2319 }
2320 }
2321 }
2322
2323 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2324 {
2325 struct ib_mad_agent_private *mad_agent_priv;
2326 struct ib_mad_send_wr_private *temp_mad_send_wr;
2327 struct list_head *list_item;
2328 unsigned long delay;
2329
2330 mad_agent_priv = mad_send_wr->mad_agent_priv;
2331 list_del(&mad_send_wr->agent_list);
2332
2333 delay = mad_send_wr->timeout;
2334 mad_send_wr->timeout += jiffies;
2335
2336 if (delay) {
2337 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2338 temp_mad_send_wr = list_entry(list_item,
2339 struct ib_mad_send_wr_private,
2340 agent_list);
2341 if (time_after(mad_send_wr->timeout,
2342 temp_mad_send_wr->timeout))
2343 break;
2344 }
2345 }
2346 else
2347 list_item = &mad_agent_priv->wait_list;
2348 list_add(&mad_send_wr->agent_list, list_item);
2349
2350 /* Reschedule a work item if we have a shorter timeout */
2351 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2352 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2353 &mad_agent_priv->timed_work, delay);
2354 }
2355
2356 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2357 int timeout_ms)
2358 {
2359 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2360 wait_for_response(mad_send_wr);
2361 }
2362
2363 /*
2364 * Process a send work completion
2365 */
2366 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2367 struct ib_mad_send_wc *mad_send_wc)
2368 {
2369 struct ib_mad_agent_private *mad_agent_priv;
2370 unsigned long flags;
2371 int ret;
2372
2373 mad_agent_priv = mad_send_wr->mad_agent_priv;
2374 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2375 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2376 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2377 if (ret == IB_RMPP_RESULT_CONSUMED)
2378 goto done;
2379 } else
2380 ret = IB_RMPP_RESULT_UNHANDLED;
2381
2382 if (mad_send_wc->status != IB_WC_SUCCESS &&
2383 mad_send_wr->status == IB_WC_SUCCESS) {
2384 mad_send_wr->status = mad_send_wc->status;
2385 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2386 }
2387
2388 if (--mad_send_wr->refcount > 0) {
2389 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2390 mad_send_wr->status == IB_WC_SUCCESS) {
2391 wait_for_response(mad_send_wr);
2392 }
2393 goto done;
2394 }
2395
2396 /* Remove send from MAD agent and notify client of completion */
2397 list_del(&mad_send_wr->agent_list);
2398 adjust_timeout(mad_agent_priv);
2399 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2400
2401 if (mad_send_wr->status != IB_WC_SUCCESS )
2402 mad_send_wc->status = mad_send_wr->status;
2403 if (ret == IB_RMPP_RESULT_INTERNAL)
2404 ib_rmpp_send_handler(mad_send_wc);
2405 else
2406 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2407 mad_send_wc);
2408
2409 /* Release reference on agent taken when sending */
2410 deref_mad_agent(mad_agent_priv);
2411 return;
2412 done:
2413 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2414 }
2415
2416 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2417 struct ib_wc *wc)
2418 {
2419 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2420 struct ib_mad_list_head *mad_list;
2421 struct ib_mad_qp_info *qp_info;
2422 struct ib_mad_queue *send_queue;
2423 struct ib_send_wr *bad_send_wr;
2424 struct ib_mad_send_wc mad_send_wc;
2425 unsigned long flags;
2426 int ret;
2427
2428 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
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
2434 retry:
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
2477 static 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
2493 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2494 struct ib_wc *wc)
2495 {
2496 struct ib_mad_list_head *mad_list;
2497 struct ib_mad_qp_info *qp_info;
2498 struct ib_mad_send_wr_private *mad_send_wr;
2499 int ret;
2500
2501 /* Determine if failure was a send or receive */
2502 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2503 qp_info = mad_list->mad_queue->qp_info;
2504 if (mad_list->mad_queue == &qp_info->recv_queue)
2505 /*
2506 * Receive errors indicate that the QP has entered the error
2507 * state - error handling/shutdown code will cleanup
2508 */
2509 return;
2510
2511 /*
2512 * Send errors will transition the QP to SQE - move
2513 * QP to RTS and repost flushed work requests
2514 */
2515 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2516 mad_list);
2517 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2518 if (mad_send_wr->retry) {
2519 /* Repost send */
2520 struct ib_send_wr *bad_send_wr;
2521
2522 mad_send_wr->retry = 0;
2523 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2524 &bad_send_wr);
2525 if (ret)
2526 ib_mad_send_done_handler(port_priv, wc);
2527 } else
2528 ib_mad_send_done_handler(port_priv, wc);
2529 } else {
2530 struct ib_qp_attr *attr;
2531
2532 /* Transition QP to RTS and fail offending send */
2533 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2534 if (attr) {
2535 attr->qp_state = IB_QPS_RTS;
2536 attr->cur_qp_state = IB_QPS_SQE;
2537 ret = ib_modify_qp(qp_info->qp, attr,
2538 IB_QP_STATE | IB_QP_CUR_STATE);
2539 kfree(attr);
2540 if (ret)
2541 dev_err(&port_priv->device->dev,
2542 "mad_error_handler - ib_modify_qp to RTS : %d\n",
2543 ret);
2544 else
2545 mark_sends_for_retry(qp_info);
2546 }
2547 ib_mad_send_done_handler(port_priv, wc);
2548 }
2549 }
2550
2551 /*
2552 * IB MAD completion callback
2553 */
2554 static void ib_mad_completion_handler(struct work_struct *work)
2555 {
2556 struct ib_mad_port_private *port_priv;
2557 struct ib_wc wc;
2558
2559 port_priv = container_of(work, struct ib_mad_port_private, work);
2560 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2561
2562 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2563 if (wc.status == IB_WC_SUCCESS) {
2564 switch (wc.opcode) {
2565 case IB_WC_SEND:
2566 ib_mad_send_done_handler(port_priv, &wc);
2567 break;
2568 case IB_WC_RECV:
2569 ib_mad_recv_done_handler(port_priv, &wc);
2570 break;
2571 default:
2572 BUG_ON(1);
2573 break;
2574 }
2575 } else
2576 mad_error_handler(port_priv, &wc);
2577 }
2578 }
2579
2580 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2581 {
2582 unsigned long flags;
2583 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2584 struct ib_mad_send_wc mad_send_wc;
2585 struct list_head cancel_list;
2586
2587 INIT_LIST_HEAD(&cancel_list);
2588
2589 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2590 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2591 &mad_agent_priv->send_list, agent_list) {
2592 if (mad_send_wr->status == IB_WC_SUCCESS) {
2593 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2594 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2595 }
2596 }
2597
2598 /* Empty wait list to prevent receives from finding a request */
2599 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2600 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2601
2602 /* Report all cancelled requests */
2603 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2604 mad_send_wc.vendor_err = 0;
2605
2606 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2607 &cancel_list, agent_list) {
2608 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2609 list_del(&mad_send_wr->agent_list);
2610 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2611 &mad_send_wc);
2612 atomic_dec(&mad_agent_priv->refcount);
2613 }
2614 }
2615
2616 static struct ib_mad_send_wr_private*
2617 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2618 struct ib_mad_send_buf *send_buf)
2619 {
2620 struct ib_mad_send_wr_private *mad_send_wr;
2621
2622 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2623 agent_list) {
2624 if (&mad_send_wr->send_buf == send_buf)
2625 return mad_send_wr;
2626 }
2627
2628 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2629 agent_list) {
2630 if (is_rmpp_data_mad(mad_agent_priv,
2631 mad_send_wr->send_buf.mad) &&
2632 &mad_send_wr->send_buf == send_buf)
2633 return mad_send_wr;
2634 }
2635 return NULL;
2636 }
2637
2638 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2639 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2640 {
2641 struct ib_mad_agent_private *mad_agent_priv;
2642 struct ib_mad_send_wr_private *mad_send_wr;
2643 unsigned long flags;
2644 int active;
2645
2646 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2647 agent);
2648 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2649 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2650 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2651 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2652 return -EINVAL;
2653 }
2654
2655 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2656 if (!timeout_ms) {
2657 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2658 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2659 }
2660
2661 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2662 if (active)
2663 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2664 else
2665 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2666
2667 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2668 return 0;
2669 }
2670 EXPORT_SYMBOL(ib_modify_mad);
2671
2672 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2673 struct ib_mad_send_buf *send_buf)
2674 {
2675 ib_modify_mad(mad_agent, send_buf, 0);
2676 }
2677 EXPORT_SYMBOL(ib_cancel_mad);
2678
2679 static void local_completions(struct work_struct *work)
2680 {
2681 struct ib_mad_agent_private *mad_agent_priv;
2682 struct ib_mad_local_private *local;
2683 struct ib_mad_agent_private *recv_mad_agent;
2684 unsigned long flags;
2685 int free_mad;
2686 struct ib_wc wc;
2687 struct ib_mad_send_wc mad_send_wc;
2688 bool opa;
2689
2690 mad_agent_priv =
2691 container_of(work, struct ib_mad_agent_private, local_work);
2692
2693 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2694 mad_agent_priv->qp_info->port_priv->port_num);
2695
2696 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2697 while (!list_empty(&mad_agent_priv->local_list)) {
2698 local = list_entry(mad_agent_priv->local_list.next,
2699 struct ib_mad_local_private,
2700 completion_list);
2701 list_del(&local->completion_list);
2702 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2703 free_mad = 0;
2704 if (local->mad_priv) {
2705 u8 base_version;
2706 recv_mad_agent = local->recv_mad_agent;
2707 if (!recv_mad_agent) {
2708 dev_err(&mad_agent_priv->agent.device->dev,
2709 "No receive MAD agent for local completion\n");
2710 free_mad = 1;
2711 goto local_send_completion;
2712 }
2713
2714 /*
2715 * Defined behavior is to complete response
2716 * before request
2717 */
2718 build_smp_wc(recv_mad_agent->agent.qp,
2719 (unsigned long) local->mad_send_wr,
2720 be16_to_cpu(IB_LID_PERMISSIVE),
2721 local->mad_send_wr->send_wr.pkey_index,
2722 recv_mad_agent->agent.port_num, &wc);
2723
2724 local->mad_priv->header.recv_wc.wc = &wc;
2725
2726 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2727 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2728 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2729 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2730 } else {
2731 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2732 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2733 }
2734
2735 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2736 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2737 &local->mad_priv->header.recv_wc.rmpp_list);
2738 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2739 local->mad_priv->header.recv_wc.recv_buf.mad =
2740 (struct ib_mad *)local->mad_priv->mad;
2741 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2742 snoop_recv(recv_mad_agent->qp_info,
2743 &local->mad_priv->header.recv_wc,
2744 IB_MAD_SNOOP_RECVS);
2745 recv_mad_agent->agent.recv_handler(
2746 &recv_mad_agent->agent,
2747 &local->mad_priv->header.recv_wc);
2748 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2749 atomic_dec(&recv_mad_agent->refcount);
2750 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2751 }
2752
2753 local_send_completion:
2754 /* Complete send */
2755 mad_send_wc.status = IB_WC_SUCCESS;
2756 mad_send_wc.vendor_err = 0;
2757 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2758 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2759 snoop_send(mad_agent_priv->qp_info,
2760 &local->mad_send_wr->send_buf,
2761 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2762 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2763 &mad_send_wc);
2764
2765 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2766 atomic_dec(&mad_agent_priv->refcount);
2767 if (free_mad)
2768 kfree(local->mad_priv);
2769 kfree(local);
2770 }
2771 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2772 }
2773
2774 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2775 {
2776 int ret;
2777
2778 if (!mad_send_wr->retries_left)
2779 return -ETIMEDOUT;
2780
2781 mad_send_wr->retries_left--;
2782 mad_send_wr->send_buf.retries++;
2783
2784 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2785
2786 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2787 ret = ib_retry_rmpp(mad_send_wr);
2788 switch (ret) {
2789 case IB_RMPP_RESULT_UNHANDLED:
2790 ret = ib_send_mad(mad_send_wr);
2791 break;
2792 case IB_RMPP_RESULT_CONSUMED:
2793 ret = 0;
2794 break;
2795 default:
2796 ret = -ECOMM;
2797 break;
2798 }
2799 } else
2800 ret = ib_send_mad(mad_send_wr);
2801
2802 if (!ret) {
2803 mad_send_wr->refcount++;
2804 list_add_tail(&mad_send_wr->agent_list,
2805 &mad_send_wr->mad_agent_priv->send_list);
2806 }
2807 return ret;
2808 }
2809
2810 static void timeout_sends(struct work_struct *work)
2811 {
2812 struct ib_mad_agent_private *mad_agent_priv;
2813 struct ib_mad_send_wr_private *mad_send_wr;
2814 struct ib_mad_send_wc mad_send_wc;
2815 unsigned long flags, delay;
2816
2817 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2818 timed_work.work);
2819 mad_send_wc.vendor_err = 0;
2820
2821 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2822 while (!list_empty(&mad_agent_priv->wait_list)) {
2823 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2824 struct ib_mad_send_wr_private,
2825 agent_list);
2826
2827 if (time_after(mad_send_wr->timeout, jiffies)) {
2828 delay = mad_send_wr->timeout - jiffies;
2829 if ((long)delay <= 0)
2830 delay = 1;
2831 queue_delayed_work(mad_agent_priv->qp_info->
2832 port_priv->wq,
2833 &mad_agent_priv->timed_work, delay);
2834 break;
2835 }
2836
2837 list_del(&mad_send_wr->agent_list);
2838 if (mad_send_wr->status == IB_WC_SUCCESS &&
2839 !retry_send(mad_send_wr))
2840 continue;
2841
2842 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2843
2844 if (mad_send_wr->status == IB_WC_SUCCESS)
2845 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2846 else
2847 mad_send_wc.status = mad_send_wr->status;
2848 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2849 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2850 &mad_send_wc);
2851
2852 atomic_dec(&mad_agent_priv->refcount);
2853 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2854 }
2855 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2856 }
2857
2858 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2859 {
2860 struct ib_mad_port_private *port_priv = cq->cq_context;
2861 unsigned long flags;
2862
2863 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2864 if (!list_empty(&port_priv->port_list))
2865 queue_work(port_priv->wq, &port_priv->work);
2866 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2867 }
2868
2869 /*
2870 * Allocate receive MADs and post receive WRs for them
2871 */
2872 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2873 struct ib_mad_private *mad)
2874 {
2875 unsigned long flags;
2876 int post, ret;
2877 struct ib_mad_private *mad_priv;
2878 struct ib_sge sg_list;
2879 struct ib_recv_wr recv_wr, *bad_recv_wr;
2880 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2881
2882 /* Initialize common scatter list fields */
2883 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2884
2885 /* Initialize common receive WR fields */
2886 recv_wr.next = NULL;
2887 recv_wr.sg_list = &sg_list;
2888 recv_wr.num_sge = 1;
2889
2890 do {
2891 /* Allocate and map receive buffer */
2892 if (mad) {
2893 mad_priv = mad;
2894 mad = NULL;
2895 } else {
2896 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2897 GFP_ATOMIC);
2898 if (!mad_priv) {
2899 dev_err(&qp_info->port_priv->device->dev,
2900 "No memory for receive buffer\n");
2901 ret = -ENOMEM;
2902 break;
2903 }
2904 }
2905 sg_list.length = mad_priv_dma_size(mad_priv);
2906 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2907 &mad_priv->grh,
2908 mad_priv_dma_size(mad_priv),
2909 DMA_FROM_DEVICE);
2910 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2911 sg_list.addr))) {
2912 ret = -ENOMEM;
2913 break;
2914 }
2915 mad_priv->header.mapping = sg_list.addr;
2916 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2917 mad_priv->header.mad_list.mad_queue = recv_queue;
2918
2919 /* Post receive WR */
2920 spin_lock_irqsave(&recv_queue->lock, flags);
2921 post = (++recv_queue->count < recv_queue->max_active);
2922 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2923 spin_unlock_irqrestore(&recv_queue->lock, flags);
2924 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2925 if (ret) {
2926 spin_lock_irqsave(&recv_queue->lock, flags);
2927 list_del(&mad_priv->header.mad_list.list);
2928 recv_queue->count--;
2929 spin_unlock_irqrestore(&recv_queue->lock, flags);
2930 ib_dma_unmap_single(qp_info->port_priv->device,
2931 mad_priv->header.mapping,
2932 mad_priv_dma_size(mad_priv),
2933 DMA_FROM_DEVICE);
2934 kfree(mad_priv);
2935 dev_err(&qp_info->port_priv->device->dev,
2936 "ib_post_recv failed: %d\n", ret);
2937 break;
2938 }
2939 } while (post);
2940
2941 return ret;
2942 }
2943
2944 /*
2945 * Return all the posted receive MADs
2946 */
2947 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2948 {
2949 struct ib_mad_private_header *mad_priv_hdr;
2950 struct ib_mad_private *recv;
2951 struct ib_mad_list_head *mad_list;
2952
2953 if (!qp_info->qp)
2954 return;
2955
2956 while (!list_empty(&qp_info->recv_queue.list)) {
2957
2958 mad_list = list_entry(qp_info->recv_queue.list.next,
2959 struct ib_mad_list_head, list);
2960 mad_priv_hdr = container_of(mad_list,
2961 struct ib_mad_private_header,
2962 mad_list);
2963 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2964 header);
2965
2966 /* Remove from posted receive MAD list */
2967 list_del(&mad_list->list);
2968
2969 ib_dma_unmap_single(qp_info->port_priv->device,
2970 recv->header.mapping,
2971 mad_priv_dma_size(recv),
2972 DMA_FROM_DEVICE);
2973 kfree(recv);
2974 }
2975
2976 qp_info->recv_queue.count = 0;
2977 }
2978
2979 /*
2980 * Start the port
2981 */
2982 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2983 {
2984 int ret, i;
2985 struct ib_qp_attr *attr;
2986 struct ib_qp *qp;
2987 u16 pkey_index;
2988
2989 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2990 if (!attr) {
2991 dev_err(&port_priv->device->dev,
2992 "Couldn't kmalloc ib_qp_attr\n");
2993 return -ENOMEM;
2994 }
2995
2996 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2997 IB_DEFAULT_PKEY_FULL, &pkey_index);
2998 if (ret)
2999 pkey_index = 0;
3000
3001 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3002 qp = port_priv->qp_info[i].qp;
3003 if (!qp)
3004 continue;
3005
3006 /*
3007 * PKey index for QP1 is irrelevant but
3008 * one is needed for the Reset to Init transition
3009 */
3010 attr->qp_state = IB_QPS_INIT;
3011 attr->pkey_index = pkey_index;
3012 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3013 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3014 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3015 if (ret) {
3016 dev_err(&port_priv->device->dev,
3017 "Couldn't change QP%d state to INIT: %d\n",
3018 i, ret);
3019 goto out;
3020 }
3021
3022 attr->qp_state = IB_QPS_RTR;
3023 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3024 if (ret) {
3025 dev_err(&port_priv->device->dev,
3026 "Couldn't change QP%d state to RTR: %d\n",
3027 i, ret);
3028 goto out;
3029 }
3030
3031 attr->qp_state = IB_QPS_RTS;
3032 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3033 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3034 if (ret) {
3035 dev_err(&port_priv->device->dev,
3036 "Couldn't change QP%d state to RTS: %d\n",
3037 i, ret);
3038 goto out;
3039 }
3040 }
3041
3042 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3043 if (ret) {
3044 dev_err(&port_priv->device->dev,
3045 "Failed to request completion notification: %d\n",
3046 ret);
3047 goto out;
3048 }
3049
3050 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3051 if (!port_priv->qp_info[i].qp)
3052 continue;
3053
3054 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3055 if (ret) {
3056 dev_err(&port_priv->device->dev,
3057 "Couldn't post receive WRs\n");
3058 goto out;
3059 }
3060 }
3061 out:
3062 kfree(attr);
3063 return ret;
3064 }
3065
3066 static void qp_event_handler(struct ib_event *event, void *qp_context)
3067 {
3068 struct ib_mad_qp_info *qp_info = qp_context;
3069
3070 /* It's worse than that! He's dead, Jim! */
3071 dev_err(&qp_info->port_priv->device->dev,
3072 "Fatal error (%d) on MAD QP (%d)\n",
3073 event->event, qp_info->qp->qp_num);
3074 }
3075
3076 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3077 struct ib_mad_queue *mad_queue)
3078 {
3079 mad_queue->qp_info = qp_info;
3080 mad_queue->count = 0;
3081 spin_lock_init(&mad_queue->lock);
3082 INIT_LIST_HEAD(&mad_queue->list);
3083 }
3084
3085 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3086 struct ib_mad_qp_info *qp_info)
3087 {
3088 qp_info->port_priv = port_priv;
3089 init_mad_queue(qp_info, &qp_info->send_queue);
3090 init_mad_queue(qp_info, &qp_info->recv_queue);
3091 INIT_LIST_HEAD(&qp_info->overflow_list);
3092 spin_lock_init(&qp_info->snoop_lock);
3093 qp_info->snoop_table = NULL;
3094 qp_info->snoop_table_size = 0;
3095 atomic_set(&qp_info->snoop_count, 0);
3096 }
3097
3098 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3099 enum ib_qp_type qp_type)
3100 {
3101 struct ib_qp_init_attr qp_init_attr;
3102 int ret;
3103
3104 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3105 qp_init_attr.send_cq = qp_info->port_priv->cq;
3106 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3107 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3108 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3109 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3110 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3111 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3112 qp_init_attr.qp_type = qp_type;
3113 qp_init_attr.port_num = qp_info->port_priv->port_num;
3114 qp_init_attr.qp_context = qp_info;
3115 qp_init_attr.event_handler = qp_event_handler;
3116 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3117 if (IS_ERR(qp_info->qp)) {
3118 dev_err(&qp_info->port_priv->device->dev,
3119 "Couldn't create ib_mad QP%d\n",
3120 get_spl_qp_index(qp_type));
3121 ret = PTR_ERR(qp_info->qp);
3122 goto error;
3123 }
3124 /* Use minimum queue sizes unless the CQ is resized */
3125 qp_info->send_queue.max_active = mad_sendq_size;
3126 qp_info->recv_queue.max_active = mad_recvq_size;
3127 return 0;
3128
3129 error:
3130 return ret;
3131 }
3132
3133 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3134 {
3135 if (!qp_info->qp)
3136 return;
3137
3138 ib_destroy_qp(qp_info->qp);
3139 kfree(qp_info->snoop_table);
3140 }
3141
3142 /*
3143 * Open the port
3144 * Create the QP, PD, MR, and CQ if needed
3145 */
3146 static int ib_mad_port_open(struct ib_device *device,
3147 int port_num)
3148 {
3149 int ret, cq_size;
3150 struct ib_mad_port_private *port_priv;
3151 unsigned long flags;
3152 char name[sizeof "ib_mad123"];
3153 int has_smi;
3154 struct ib_cq_init_attr cq_attr = {};
3155
3156 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3157 return -EFAULT;
3158
3159 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3160 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3161 return -EFAULT;
3162
3163 /* Create new device info */
3164 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3165 if (!port_priv) {
3166 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
3167 return -ENOMEM;
3168 }
3169
3170 port_priv->device = device;
3171 port_priv->port_num = port_num;
3172 spin_lock_init(&port_priv->reg_lock);
3173 INIT_LIST_HEAD(&port_priv->agent_list);
3174 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3175 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3176
3177 cq_size = mad_sendq_size + mad_recvq_size;
3178 has_smi = rdma_cap_ib_smi(device, port_num);
3179 if (has_smi)
3180 cq_size *= 2;
3181
3182 cq_attr.cqe = cq_size;
3183 port_priv->cq = ib_create_cq(port_priv->device,
3184 ib_mad_thread_completion_handler,
3185 NULL, port_priv, &cq_attr);
3186 if (IS_ERR(port_priv->cq)) {
3187 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3188 ret = PTR_ERR(port_priv->cq);
3189 goto error3;
3190 }
3191
3192 port_priv->pd = ib_alloc_pd(device);
3193 if (IS_ERR(port_priv->pd)) {
3194 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3195 ret = PTR_ERR(port_priv->pd);
3196 goto error4;
3197 }
3198
3199 if (has_smi) {
3200 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3201 if (ret)
3202 goto error6;
3203 }
3204 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3205 if (ret)
3206 goto error7;
3207
3208 snprintf(name, sizeof name, "ib_mad%d", port_num);
3209 port_priv->wq = create_singlethread_workqueue(name);
3210 if (!port_priv->wq) {
3211 ret = -ENOMEM;
3212 goto error8;
3213 }
3214 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
3215
3216 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3217 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3218 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3219
3220 ret = ib_mad_port_start(port_priv);
3221 if (ret) {
3222 dev_err(&device->dev, "Couldn't start port\n");
3223 goto error9;
3224 }
3225
3226 return 0;
3227
3228 error9:
3229 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3230 list_del_init(&port_priv->port_list);
3231 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3232
3233 destroy_workqueue(port_priv->wq);
3234 error8:
3235 destroy_mad_qp(&port_priv->qp_info[1]);
3236 error7:
3237 destroy_mad_qp(&port_priv->qp_info[0]);
3238 error6:
3239 ib_dealloc_pd(port_priv->pd);
3240 error4:
3241 ib_destroy_cq(port_priv->cq);
3242 cleanup_recv_queue(&port_priv->qp_info[1]);
3243 cleanup_recv_queue(&port_priv->qp_info[0]);
3244 error3:
3245 kfree(port_priv);
3246
3247 return ret;
3248 }
3249
3250 /*
3251 * Close the port
3252 * If there are no classes using the port, free the port
3253 * resources (CQ, MR, PD, QP) and remove the port's info structure
3254 */
3255 static int ib_mad_port_close(struct ib_device *device, int port_num)
3256 {
3257 struct ib_mad_port_private *port_priv;
3258 unsigned long flags;
3259
3260 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3261 port_priv = __ib_get_mad_port(device, port_num);
3262 if (port_priv == NULL) {
3263 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3264 dev_err(&device->dev, "Port %d not found\n", port_num);
3265 return -ENODEV;
3266 }
3267 list_del_init(&port_priv->port_list);
3268 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3269
3270 destroy_workqueue(port_priv->wq);
3271 destroy_mad_qp(&port_priv->qp_info[1]);
3272 destroy_mad_qp(&port_priv->qp_info[0]);
3273 ib_dealloc_pd(port_priv->pd);
3274 ib_destroy_cq(port_priv->cq);
3275 cleanup_recv_queue(&port_priv->qp_info[1]);
3276 cleanup_recv_queue(&port_priv->qp_info[0]);
3277 /* XXX: Handle deallocation of MAD registration tables */
3278
3279 kfree(port_priv);
3280
3281 return 0;
3282 }
3283
3284 static void ib_mad_init_device(struct ib_device *device)
3285 {
3286 int start, i;
3287
3288 start = rdma_start_port(device);
3289
3290 for (i = start; i <= rdma_end_port(device); i++) {
3291 if (!rdma_cap_ib_mad(device, i))
3292 continue;
3293
3294 if (ib_mad_port_open(device, i)) {
3295 dev_err(&device->dev, "Couldn't open port %d\n", i);
3296 goto error;
3297 }
3298 if (ib_agent_port_open(device, i)) {
3299 dev_err(&device->dev,
3300 "Couldn't open port %d for agents\n", i);
3301 goto error_agent;
3302 }
3303 }
3304 return;
3305
3306 error_agent:
3307 if (ib_mad_port_close(device, i))
3308 dev_err(&device->dev, "Couldn't close port %d\n", i);
3309
3310 error:
3311 while (--i >= start) {
3312 if (!rdma_cap_ib_mad(device, i))
3313 continue;
3314
3315 if (ib_agent_port_close(device, i))
3316 dev_err(&device->dev,
3317 "Couldn't close port %d for agents\n", i);
3318 if (ib_mad_port_close(device, i))
3319 dev_err(&device->dev, "Couldn't close port %d\n", i);
3320 }
3321 }
3322
3323 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3324 {
3325 int i;
3326
3327 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3328 if (!rdma_cap_ib_mad(device, i))
3329 continue;
3330
3331 if (ib_agent_port_close(device, i))
3332 dev_err(&device->dev,
3333 "Couldn't close port %d for agents\n", i);
3334 if (ib_mad_port_close(device, i))
3335 dev_err(&device->dev, "Couldn't close port %d\n", i);
3336 }
3337 }
3338
3339 static struct ib_client mad_client = {
3340 .name = "mad",
3341 .add = ib_mad_init_device,
3342 .remove = ib_mad_remove_device
3343 };
3344
3345 static int __init ib_mad_init_module(void)
3346 {
3347 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3348 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3349
3350 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3351 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3352
3353 INIT_LIST_HEAD(&ib_mad_port_list);
3354
3355 if (ib_register_client(&mad_client)) {
3356 pr_err("Couldn't register ib_mad client\n");
3357 return -EINVAL;
3358 }
3359
3360 return 0;
3361 }
3362
3363 static void __exit ib_mad_cleanup_module(void)
3364 {
3365 ib_unregister_client(&mad_client);
3366 }
3367
3368 module_init(ib_mad_init_module);
3369 module_exit(ib_mad_cleanup_module);
Linux kernel - Deliverables
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