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iw_cxgb4: enforce qp/cq id requirements
[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 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 */
36
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38
39 #include <linux/dma-mapping.h>
40 #include <linux/slab.h>
41 #include <linux/module.h>
42 #include <rdma/ib_cache.h>
43
44 #include "mad_priv.h"
45 #include "mad_rmpp.h"
46 #include "smi.h"
47 #include "agent.h"
48
49 MODULE_LICENSE("Dual BSD/GPL");
50 MODULE_DESCRIPTION("kernel IB MAD API");
51 MODULE_AUTHOR("Hal Rosenstock");
52 MODULE_AUTHOR("Sean Hefty");
53
54 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
55 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
56
57 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
58 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
59 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
60 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
61
62 static struct kmem_cache *ib_mad_cache;
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 struct ib_mad *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(struct ib_mad *mad)
183 {
184 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
185 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
187 (mad->mad_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 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
342 IB_ACCESS_LOCAL_WRITE);
343 if (IS_ERR(mad_agent_priv->agent.mr)) {
344 ret = ERR_PTR(-ENOMEM);
345 goto error2;
346 }
347
348 if (mad_reg_req) {
349 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
350 if (!reg_req) {
351 ret = ERR_PTR(-ENOMEM);
352 goto error3;
353 }
354 }
355
356 /* Now, fill in the various structures */
357 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
358 mad_agent_priv->reg_req = reg_req;
359 mad_agent_priv->agent.rmpp_version = rmpp_version;
360 mad_agent_priv->agent.device = device;
361 mad_agent_priv->agent.recv_handler = recv_handler;
362 mad_agent_priv->agent.send_handler = send_handler;
363 mad_agent_priv->agent.context = context;
364 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
365 mad_agent_priv->agent.port_num = port_num;
366 mad_agent_priv->agent.flags = registration_flags;
367 spin_lock_init(&mad_agent_priv->lock);
368 INIT_LIST_HEAD(&mad_agent_priv->send_list);
369 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
370 INIT_LIST_HEAD(&mad_agent_priv->done_list);
371 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
372 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
373 INIT_LIST_HEAD(&mad_agent_priv->local_list);
374 INIT_WORK(&mad_agent_priv->local_work, local_completions);
375 atomic_set(&mad_agent_priv->refcount, 1);
376 init_completion(&mad_agent_priv->comp);
377
378 spin_lock_irqsave(&port_priv->reg_lock, flags);
379 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
380
381 /*
382 * Make sure MAD registration (if supplied)
383 * is non overlapping with any existing ones
384 */
385 if (mad_reg_req) {
386 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
387 if (!is_vendor_class(mgmt_class)) {
388 class = port_priv->version[mad_reg_req->
389 mgmt_class_version].class;
390 if (class) {
391 method = class->method_table[mgmt_class];
392 if (method) {
393 if (method_in_use(&method,
394 mad_reg_req))
395 goto error4;
396 }
397 }
398 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
399 mgmt_class);
400 } else {
401 /* "New" vendor class range */
402 vendor = port_priv->version[mad_reg_req->
403 mgmt_class_version].vendor;
404 if (vendor) {
405 vclass = vendor_class_index(mgmt_class);
406 vendor_class = vendor->vendor_class[vclass];
407 if (vendor_class) {
408 if (is_vendor_method_in_use(
409 vendor_class,
410 mad_reg_req))
411 goto error4;
412 }
413 }
414 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
415 }
416 if (ret2) {
417 ret = ERR_PTR(ret2);
418 goto error4;
419 }
420 }
421
422 /* Add mad agent into port's agent list */
423 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
424 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
425
426 return &mad_agent_priv->agent;
427
428 error4:
429 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
430 kfree(reg_req);
431 error3:
432 ib_dereg_mr(mad_agent_priv->agent.mr);
433 error2:
434 kfree(mad_agent_priv);
435 error1:
436 return ret;
437 }
438 EXPORT_SYMBOL(ib_register_mad_agent);
439
440 static inline int is_snooping_sends(int mad_snoop_flags)
441 {
442 return (mad_snoop_flags &
443 (/*IB_MAD_SNOOP_POSTED_SENDS |
444 IB_MAD_SNOOP_RMPP_SENDS |*/
445 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
446 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
447 }
448
449 static inline int is_snooping_recvs(int mad_snoop_flags)
450 {
451 return (mad_snoop_flags &
452 (IB_MAD_SNOOP_RECVS /*|
453 IB_MAD_SNOOP_RMPP_RECVS*/));
454 }
455
456 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
457 struct ib_mad_snoop_private *mad_snoop_priv)
458 {
459 struct ib_mad_snoop_private **new_snoop_table;
460 unsigned long flags;
461 int i;
462
463 spin_lock_irqsave(&qp_info->snoop_lock, flags);
464 /* Check for empty slot in array. */
465 for (i = 0; i < qp_info->snoop_table_size; i++)
466 if (!qp_info->snoop_table[i])
467 break;
468
469 if (i == qp_info->snoop_table_size) {
470 /* Grow table. */
471 new_snoop_table = krealloc(qp_info->snoop_table,
472 sizeof mad_snoop_priv *
473 (qp_info->snoop_table_size + 1),
474 GFP_ATOMIC);
475 if (!new_snoop_table) {
476 i = -ENOMEM;
477 goto out;
478 }
479
480 qp_info->snoop_table = new_snoop_table;
481 qp_info->snoop_table_size++;
482 }
483 qp_info->snoop_table[i] = mad_snoop_priv;
484 atomic_inc(&qp_info->snoop_count);
485 out:
486 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
487 return i;
488 }
489
490 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
491 u8 port_num,
492 enum ib_qp_type qp_type,
493 int mad_snoop_flags,
494 ib_mad_snoop_handler snoop_handler,
495 ib_mad_recv_handler recv_handler,
496 void *context)
497 {
498 struct ib_mad_port_private *port_priv;
499 struct ib_mad_agent *ret;
500 struct ib_mad_snoop_private *mad_snoop_priv;
501 int qpn;
502
503 /* Validate parameters */
504 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
505 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
506 ret = ERR_PTR(-EINVAL);
507 goto error1;
508 }
509 qpn = get_spl_qp_index(qp_type);
510 if (qpn == -1) {
511 ret = ERR_PTR(-EINVAL);
512 goto error1;
513 }
514 port_priv = ib_get_mad_port(device, port_num);
515 if (!port_priv) {
516 ret = ERR_PTR(-ENODEV);
517 goto error1;
518 }
519 /* Allocate structures */
520 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
521 if (!mad_snoop_priv) {
522 ret = ERR_PTR(-ENOMEM);
523 goto error1;
524 }
525
526 /* Now, fill in the various structures */
527 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
528 mad_snoop_priv->agent.device = device;
529 mad_snoop_priv->agent.recv_handler = recv_handler;
530 mad_snoop_priv->agent.snoop_handler = snoop_handler;
531 mad_snoop_priv->agent.context = context;
532 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
533 mad_snoop_priv->agent.port_num = port_num;
534 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
535 init_completion(&mad_snoop_priv->comp);
536 mad_snoop_priv->snoop_index = register_snoop_agent(
537 &port_priv->qp_info[qpn],
538 mad_snoop_priv);
539 if (mad_snoop_priv->snoop_index < 0) {
540 ret = ERR_PTR(mad_snoop_priv->snoop_index);
541 goto error2;
542 }
543
544 atomic_set(&mad_snoop_priv->refcount, 1);
545 return &mad_snoop_priv->agent;
546
547 error2:
548 kfree(mad_snoop_priv);
549 error1:
550 return ret;
551 }
552 EXPORT_SYMBOL(ib_register_mad_snoop);
553
554 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
555 {
556 if (atomic_dec_and_test(&mad_agent_priv->refcount))
557 complete(&mad_agent_priv->comp);
558 }
559
560 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
561 {
562 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
563 complete(&mad_snoop_priv->comp);
564 }
565
566 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
567 {
568 struct ib_mad_port_private *port_priv;
569 unsigned long flags;
570
571 /* Note that we could still be handling received MADs */
572
573 /*
574 * Canceling all sends results in dropping received response
575 * MADs, preventing us from queuing additional work
576 */
577 cancel_mads(mad_agent_priv);
578 port_priv = mad_agent_priv->qp_info->port_priv;
579 cancel_delayed_work(&mad_agent_priv->timed_work);
580
581 spin_lock_irqsave(&port_priv->reg_lock, flags);
582 remove_mad_reg_req(mad_agent_priv);
583 list_del(&mad_agent_priv->agent_list);
584 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
585
586 flush_workqueue(port_priv->wq);
587 ib_cancel_rmpp_recvs(mad_agent_priv);
588
589 deref_mad_agent(mad_agent_priv);
590 wait_for_completion(&mad_agent_priv->comp);
591
592 kfree(mad_agent_priv->reg_req);
593 ib_dereg_mr(mad_agent_priv->agent.mr);
594 kfree(mad_agent_priv);
595 }
596
597 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
598 {
599 struct ib_mad_qp_info *qp_info;
600 unsigned long flags;
601
602 qp_info = mad_snoop_priv->qp_info;
603 spin_lock_irqsave(&qp_info->snoop_lock, flags);
604 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
605 atomic_dec(&qp_info->snoop_count);
606 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
607
608 deref_snoop_agent(mad_snoop_priv);
609 wait_for_completion(&mad_snoop_priv->comp);
610
611 kfree(mad_snoop_priv);
612 }
613
614 /*
615 * ib_unregister_mad_agent - Unregisters a client from using MAD services
616 */
617 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
618 {
619 struct ib_mad_agent_private *mad_agent_priv;
620 struct ib_mad_snoop_private *mad_snoop_priv;
621
622 /* If the TID is zero, the agent can only snoop. */
623 if (mad_agent->hi_tid) {
624 mad_agent_priv = container_of(mad_agent,
625 struct ib_mad_agent_private,
626 agent);
627 unregister_mad_agent(mad_agent_priv);
628 } else {
629 mad_snoop_priv = container_of(mad_agent,
630 struct ib_mad_snoop_private,
631 agent);
632 unregister_mad_snoop(mad_snoop_priv);
633 }
634 return 0;
635 }
636 EXPORT_SYMBOL(ib_unregister_mad_agent);
637
638 static void dequeue_mad(struct ib_mad_list_head *mad_list)
639 {
640 struct ib_mad_queue *mad_queue;
641 unsigned long flags;
642
643 BUG_ON(!mad_list->mad_queue);
644 mad_queue = mad_list->mad_queue;
645 spin_lock_irqsave(&mad_queue->lock, flags);
646 list_del(&mad_list->list);
647 mad_queue->count--;
648 spin_unlock_irqrestore(&mad_queue->lock, flags);
649 }
650
651 static void snoop_send(struct ib_mad_qp_info *qp_info,
652 struct ib_mad_send_buf *send_buf,
653 struct ib_mad_send_wc *mad_send_wc,
654 int mad_snoop_flags)
655 {
656 struct ib_mad_snoop_private *mad_snoop_priv;
657 unsigned long flags;
658 int i;
659
660 spin_lock_irqsave(&qp_info->snoop_lock, flags);
661 for (i = 0; i < qp_info->snoop_table_size; i++) {
662 mad_snoop_priv = qp_info->snoop_table[i];
663 if (!mad_snoop_priv ||
664 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
665 continue;
666
667 atomic_inc(&mad_snoop_priv->refcount);
668 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
669 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
670 send_buf, mad_send_wc);
671 deref_snoop_agent(mad_snoop_priv);
672 spin_lock_irqsave(&qp_info->snoop_lock, flags);
673 }
674 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
675 }
676
677 static void snoop_recv(struct ib_mad_qp_info *qp_info,
678 struct ib_mad_recv_wc *mad_recv_wc,
679 int mad_snoop_flags)
680 {
681 struct ib_mad_snoop_private *mad_snoop_priv;
682 unsigned long flags;
683 int i;
684
685 spin_lock_irqsave(&qp_info->snoop_lock, flags);
686 for (i = 0; i < qp_info->snoop_table_size; i++) {
687 mad_snoop_priv = qp_info->snoop_table[i];
688 if (!mad_snoop_priv ||
689 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
690 continue;
691
692 atomic_inc(&mad_snoop_priv->refcount);
693 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
694 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
695 mad_recv_wc);
696 deref_snoop_agent(mad_snoop_priv);
697 spin_lock_irqsave(&qp_info->snoop_lock, flags);
698 }
699 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
700 }
701
702 static void build_smp_wc(struct ib_qp *qp,
703 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
704 struct ib_wc *wc)
705 {
706 memset(wc, 0, sizeof *wc);
707 wc->wr_id = wr_id;
708 wc->status = IB_WC_SUCCESS;
709 wc->opcode = IB_WC_RECV;
710 wc->pkey_index = pkey_index;
711 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
712 wc->src_qp = IB_QP0;
713 wc->qp = qp;
714 wc->slid = slid;
715 wc->sl = 0;
716 wc->dlid_path_bits = 0;
717 wc->port_num = port_num;
718 }
719
720 /*
721 * Return 0 if SMP is to be sent
722 * Return 1 if SMP was consumed locally (whether or not solicited)
723 * Return < 0 if error
724 */
725 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
726 struct ib_mad_send_wr_private *mad_send_wr)
727 {
728 int ret = 0;
729 struct ib_smp *smp = mad_send_wr->send_buf.mad;
730 unsigned long flags;
731 struct ib_mad_local_private *local;
732 struct ib_mad_private *mad_priv;
733 struct ib_mad_port_private *port_priv;
734 struct ib_mad_agent_private *recv_mad_agent = NULL;
735 struct ib_device *device = mad_agent_priv->agent.device;
736 u8 port_num;
737 struct ib_wc mad_wc;
738 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
739
740 if (device->node_type == RDMA_NODE_IB_SWITCH &&
741 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
742 port_num = send_wr->wr.ud.port_num;
743 else
744 port_num = mad_agent_priv->agent.port_num;
745
746 /*
747 * Directed route handling starts if the initial LID routed part of
748 * a request or the ending LID routed part of a response is empty.
749 * If we are at the start of the LID routed part, don't update the
750 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
751 */
752 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
753 IB_LID_PERMISSIVE &&
754 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
755 IB_SMI_DISCARD) {
756 ret = -EINVAL;
757 dev_err(&device->dev, "Invalid directed route\n");
758 goto out;
759 }
760
761 /* Check to post send on QP or process locally */
762 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
763 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
764 goto out;
765
766 local = kmalloc(sizeof *local, GFP_ATOMIC);
767 if (!local) {
768 ret = -ENOMEM;
769 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
770 goto out;
771 }
772 local->mad_priv = NULL;
773 local->recv_mad_agent = NULL;
774 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
775 if (!mad_priv) {
776 ret = -ENOMEM;
777 dev_err(&device->dev, "No memory for local response MAD\n");
778 kfree(local);
779 goto out;
780 }
781
782 build_smp_wc(mad_agent_priv->agent.qp,
783 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
784 send_wr->wr.ud.pkey_index,
785 send_wr->wr.ud.port_num, &mad_wc);
786
787 /* No GRH for DR SMP */
788 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
789 (struct ib_mad *)smp,
790 (struct ib_mad *)&mad_priv->mad);
791 switch (ret)
792 {
793 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
794 if (ib_response_mad(&mad_priv->mad.mad) &&
795 mad_agent_priv->agent.recv_handler) {
796 local->mad_priv = mad_priv;
797 local->recv_mad_agent = mad_agent_priv;
798 /*
799 * Reference MAD agent until receive
800 * side of local completion handled
801 */
802 atomic_inc(&mad_agent_priv->refcount);
803 } else
804 kmem_cache_free(ib_mad_cache, mad_priv);
805 break;
806 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
807 kmem_cache_free(ib_mad_cache, mad_priv);
808 break;
809 case IB_MAD_RESULT_SUCCESS:
810 /* Treat like an incoming receive MAD */
811 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
812 mad_agent_priv->agent.port_num);
813 if (port_priv) {
814 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
815 recv_mad_agent = find_mad_agent(port_priv,
816 &mad_priv->mad.mad);
817 }
818 if (!port_priv || !recv_mad_agent) {
819 /*
820 * No receiving agent so drop packet and
821 * generate send completion.
822 */
823 kmem_cache_free(ib_mad_cache, mad_priv);
824 break;
825 }
826 local->mad_priv = mad_priv;
827 local->recv_mad_agent = recv_mad_agent;
828 break;
829 default:
830 kmem_cache_free(ib_mad_cache, mad_priv);
831 kfree(local);
832 ret = -EINVAL;
833 goto out;
834 }
835
836 local->mad_send_wr = mad_send_wr;
837 /* Reference MAD agent until send side of local completion handled */
838 atomic_inc(&mad_agent_priv->refcount);
839 /* Queue local completion to local list */
840 spin_lock_irqsave(&mad_agent_priv->lock, flags);
841 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
842 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
843 queue_work(mad_agent_priv->qp_info->port_priv->wq,
844 &mad_agent_priv->local_work);
845 ret = 1;
846 out:
847 return ret;
848 }
849
850 static int get_pad_size(int hdr_len, int data_len)
851 {
852 int seg_size, pad;
853
854 seg_size = sizeof(struct ib_mad) - hdr_len;
855 if (data_len && seg_size) {
856 pad = seg_size - data_len % seg_size;
857 return pad == seg_size ? 0 : pad;
858 } else
859 return seg_size;
860 }
861
862 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
863 {
864 struct ib_rmpp_segment *s, *t;
865
866 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
867 list_del(&s->list);
868 kfree(s);
869 }
870 }
871
872 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
873 gfp_t gfp_mask)
874 {
875 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
876 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
877 struct ib_rmpp_segment *seg = NULL;
878 int left, seg_size, pad;
879
880 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
881 seg_size = send_buf->seg_size;
882 pad = send_wr->pad;
883
884 /* Allocate data segments. */
885 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
886 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
887 if (!seg) {
888 dev_err(&send_buf->mad_agent->device->dev,
889 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
890 sizeof (*seg) + seg_size, gfp_mask);
891 free_send_rmpp_list(send_wr);
892 return -ENOMEM;
893 }
894 seg->num = ++send_buf->seg_count;
895 list_add_tail(&seg->list, &send_wr->rmpp_list);
896 }
897
898 /* Zero any padding */
899 if (pad)
900 memset(seg->data + seg_size - pad, 0, pad);
901
902 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
903 agent.rmpp_version;
904 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
905 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
906
907 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
908 struct ib_rmpp_segment, list);
909 send_wr->last_ack_seg = send_wr->cur_seg;
910 return 0;
911 }
912
913 int ib_mad_kernel_rmpp_agent(struct ib_mad_agent *agent)
914 {
915 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
916 }
917 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
918
919 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
920 u32 remote_qpn, u16 pkey_index,
921 int rmpp_active,
922 int hdr_len, int data_len,
923 gfp_t gfp_mask)
924 {
925 struct ib_mad_agent_private *mad_agent_priv;
926 struct ib_mad_send_wr_private *mad_send_wr;
927 int pad, message_size, ret, size;
928 void *buf;
929
930 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
931 agent);
932 pad = get_pad_size(hdr_len, data_len);
933 message_size = hdr_len + data_len + pad;
934
935 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
936 if (!rmpp_active && message_size > sizeof(struct ib_mad))
937 return ERR_PTR(-EINVAL);
938 } else
939 if (rmpp_active || message_size > sizeof(struct ib_mad))
940 return ERR_PTR(-EINVAL);
941
942 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
943 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
944 if (!buf)
945 return ERR_PTR(-ENOMEM);
946
947 mad_send_wr = buf + size;
948 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
949 mad_send_wr->send_buf.mad = buf;
950 mad_send_wr->send_buf.hdr_len = hdr_len;
951 mad_send_wr->send_buf.data_len = data_len;
952 mad_send_wr->pad = pad;
953
954 mad_send_wr->mad_agent_priv = mad_agent_priv;
955 mad_send_wr->sg_list[0].length = hdr_len;
956 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
957 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
958 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
959
960 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
961 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
962 mad_send_wr->send_wr.num_sge = 2;
963 mad_send_wr->send_wr.opcode = IB_WR_SEND;
964 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
965 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
966 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
967 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
968
969 if (rmpp_active) {
970 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
971 if (ret) {
972 kfree(buf);
973 return ERR_PTR(ret);
974 }
975 }
976
977 mad_send_wr->send_buf.mad_agent = mad_agent;
978 atomic_inc(&mad_agent_priv->refcount);
979 return &mad_send_wr->send_buf;
980 }
981 EXPORT_SYMBOL(ib_create_send_mad);
982
983 int ib_get_mad_data_offset(u8 mgmt_class)
984 {
985 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
986 return IB_MGMT_SA_HDR;
987 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
988 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
989 (mgmt_class == IB_MGMT_CLASS_BIS))
990 return IB_MGMT_DEVICE_HDR;
991 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
992 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
993 return IB_MGMT_VENDOR_HDR;
994 else
995 return IB_MGMT_MAD_HDR;
996 }
997 EXPORT_SYMBOL(ib_get_mad_data_offset);
998
999 int ib_is_mad_class_rmpp(u8 mgmt_class)
1000 {
1001 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1002 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1003 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1004 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1005 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1006 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1007 return 1;
1008 return 0;
1009 }
1010 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1011
1012 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1013 {
1014 struct ib_mad_send_wr_private *mad_send_wr;
1015 struct list_head *list;
1016
1017 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1018 send_buf);
1019 list = &mad_send_wr->cur_seg->list;
1020
1021 if (mad_send_wr->cur_seg->num < seg_num) {
1022 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1023 if (mad_send_wr->cur_seg->num == seg_num)
1024 break;
1025 } else if (mad_send_wr->cur_seg->num > seg_num) {
1026 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1027 if (mad_send_wr->cur_seg->num == seg_num)
1028 break;
1029 }
1030 return mad_send_wr->cur_seg->data;
1031 }
1032 EXPORT_SYMBOL(ib_get_rmpp_segment);
1033
1034 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1035 {
1036 if (mad_send_wr->send_buf.seg_count)
1037 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1038 mad_send_wr->seg_num);
1039 else
1040 return mad_send_wr->send_buf.mad +
1041 mad_send_wr->send_buf.hdr_len;
1042 }
1043
1044 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1045 {
1046 struct ib_mad_agent_private *mad_agent_priv;
1047 struct ib_mad_send_wr_private *mad_send_wr;
1048
1049 mad_agent_priv = container_of(send_buf->mad_agent,
1050 struct ib_mad_agent_private, agent);
1051 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1052 send_buf);
1053
1054 free_send_rmpp_list(mad_send_wr);
1055 kfree(send_buf->mad);
1056 deref_mad_agent(mad_agent_priv);
1057 }
1058 EXPORT_SYMBOL(ib_free_send_mad);
1059
1060 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1061 {
1062 struct ib_mad_qp_info *qp_info;
1063 struct list_head *list;
1064 struct ib_send_wr *bad_send_wr;
1065 struct ib_mad_agent *mad_agent;
1066 struct ib_sge *sge;
1067 unsigned long flags;
1068 int ret;
1069
1070 /* Set WR ID to find mad_send_wr upon completion */
1071 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1072 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1073 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1074
1075 mad_agent = mad_send_wr->send_buf.mad_agent;
1076 sge = mad_send_wr->sg_list;
1077 sge[0].addr = ib_dma_map_single(mad_agent->device,
1078 mad_send_wr->send_buf.mad,
1079 sge[0].length,
1080 DMA_TO_DEVICE);
1081 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1082 return -ENOMEM;
1083
1084 mad_send_wr->header_mapping = sge[0].addr;
1085
1086 sge[1].addr = ib_dma_map_single(mad_agent->device,
1087 ib_get_payload(mad_send_wr),
1088 sge[1].length,
1089 DMA_TO_DEVICE);
1090 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1091 ib_dma_unmap_single(mad_agent->device,
1092 mad_send_wr->header_mapping,
1093 sge[0].length, DMA_TO_DEVICE);
1094 return -ENOMEM;
1095 }
1096 mad_send_wr->payload_mapping = sge[1].addr;
1097
1098 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1099 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1100 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1101 &bad_send_wr);
1102 list = &qp_info->send_queue.list;
1103 } else {
1104 ret = 0;
1105 list = &qp_info->overflow_list;
1106 }
1107
1108 if (!ret) {
1109 qp_info->send_queue.count++;
1110 list_add_tail(&mad_send_wr->mad_list.list, list);
1111 }
1112 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1113 if (ret) {
1114 ib_dma_unmap_single(mad_agent->device,
1115 mad_send_wr->header_mapping,
1116 sge[0].length, DMA_TO_DEVICE);
1117 ib_dma_unmap_single(mad_agent->device,
1118 mad_send_wr->payload_mapping,
1119 sge[1].length, DMA_TO_DEVICE);
1120 }
1121 return ret;
1122 }
1123
1124 /*
1125 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1126 * with the registered client
1127 */
1128 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1129 struct ib_mad_send_buf **bad_send_buf)
1130 {
1131 struct ib_mad_agent_private *mad_agent_priv;
1132 struct ib_mad_send_buf *next_send_buf;
1133 struct ib_mad_send_wr_private *mad_send_wr;
1134 unsigned long flags;
1135 int ret = -EINVAL;
1136
1137 /* Walk list of send WRs and post each on send list */
1138 for (; send_buf; send_buf = next_send_buf) {
1139
1140 mad_send_wr = container_of(send_buf,
1141 struct ib_mad_send_wr_private,
1142 send_buf);
1143 mad_agent_priv = mad_send_wr->mad_agent_priv;
1144
1145 if (!send_buf->mad_agent->send_handler ||
1146 (send_buf->timeout_ms &&
1147 !send_buf->mad_agent->recv_handler)) {
1148 ret = -EINVAL;
1149 goto error;
1150 }
1151
1152 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1153 if (mad_agent_priv->agent.rmpp_version) {
1154 ret = -EINVAL;
1155 goto error;
1156 }
1157 }
1158
1159 /*
1160 * Save pointer to next work request to post in case the
1161 * current one completes, and the user modifies the work
1162 * request associated with the completion
1163 */
1164 next_send_buf = send_buf->next;
1165 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1166
1167 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1168 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1169 ret = handle_outgoing_dr_smp(mad_agent_priv,
1170 mad_send_wr);
1171 if (ret < 0) /* error */
1172 goto error;
1173 else if (ret == 1) /* locally consumed */
1174 continue;
1175 }
1176
1177 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1178 /* Timeout will be updated after send completes */
1179 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1180 mad_send_wr->max_retries = send_buf->retries;
1181 mad_send_wr->retries_left = send_buf->retries;
1182 send_buf->retries = 0;
1183 /* Reference for work request to QP + response */
1184 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1185 mad_send_wr->status = IB_WC_SUCCESS;
1186
1187 /* Reference MAD agent until send completes */
1188 atomic_inc(&mad_agent_priv->refcount);
1189 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1190 list_add_tail(&mad_send_wr->agent_list,
1191 &mad_agent_priv->send_list);
1192 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1193
1194 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1195 ret = ib_send_rmpp_mad(mad_send_wr);
1196 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1197 ret = ib_send_mad(mad_send_wr);
1198 } else
1199 ret = ib_send_mad(mad_send_wr);
1200 if (ret < 0) {
1201 /* Fail send request */
1202 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1203 list_del(&mad_send_wr->agent_list);
1204 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1205 atomic_dec(&mad_agent_priv->refcount);
1206 goto error;
1207 }
1208 }
1209 return 0;
1210 error:
1211 if (bad_send_buf)
1212 *bad_send_buf = send_buf;
1213 return ret;
1214 }
1215 EXPORT_SYMBOL(ib_post_send_mad);
1216
1217 /*
1218 * ib_free_recv_mad - Returns data buffers used to receive
1219 * a MAD to the access layer
1220 */
1221 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1222 {
1223 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1224 struct ib_mad_private_header *mad_priv_hdr;
1225 struct ib_mad_private *priv;
1226 struct list_head free_list;
1227
1228 INIT_LIST_HEAD(&free_list);
1229 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1230
1231 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1232 &free_list, list) {
1233 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1234 recv_buf);
1235 mad_priv_hdr = container_of(mad_recv_wc,
1236 struct ib_mad_private_header,
1237 recv_wc);
1238 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1239 header);
1240 kmem_cache_free(ib_mad_cache, priv);
1241 }
1242 }
1243 EXPORT_SYMBOL(ib_free_recv_mad);
1244
1245 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1246 u8 rmpp_version,
1247 ib_mad_send_handler send_handler,
1248 ib_mad_recv_handler recv_handler,
1249 void *context)
1250 {
1251 return ERR_PTR(-EINVAL); /* XXX: for now */
1252 }
1253 EXPORT_SYMBOL(ib_redirect_mad_qp);
1254
1255 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1256 struct ib_wc *wc)
1257 {
1258 dev_err(&mad_agent->device->dev,
1259 "ib_process_mad_wc() not implemented yet\n");
1260 return 0;
1261 }
1262 EXPORT_SYMBOL(ib_process_mad_wc);
1263
1264 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1265 struct ib_mad_reg_req *mad_reg_req)
1266 {
1267 int i;
1268
1269 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1270 if ((*method)->agent[i]) {
1271 pr_err("Method %d already in use\n", i);
1272 return -EINVAL;
1273 }
1274 }
1275 return 0;
1276 }
1277
1278 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1279 {
1280 /* Allocate management method table */
1281 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1282 if (!*method) {
1283 pr_err("No memory for ib_mad_mgmt_method_table\n");
1284 return -ENOMEM;
1285 }
1286
1287 return 0;
1288 }
1289
1290 /*
1291 * Check to see if there are any methods still in use
1292 */
1293 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1294 {
1295 int i;
1296
1297 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1298 if (method->agent[i])
1299 return 1;
1300 return 0;
1301 }
1302
1303 /*
1304 * Check to see if there are any method tables for this class still in use
1305 */
1306 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1307 {
1308 int i;
1309
1310 for (i = 0; i < MAX_MGMT_CLASS; i++)
1311 if (class->method_table[i])
1312 return 1;
1313 return 0;
1314 }
1315
1316 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1317 {
1318 int i;
1319
1320 for (i = 0; i < MAX_MGMT_OUI; i++)
1321 if (vendor_class->method_table[i])
1322 return 1;
1323 return 0;
1324 }
1325
1326 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1327 char *oui)
1328 {
1329 int i;
1330
1331 for (i = 0; i < MAX_MGMT_OUI; i++)
1332 /* Is there matching OUI for this vendor class ? */
1333 if (!memcmp(vendor_class->oui[i], oui, 3))
1334 return i;
1335
1336 return -1;
1337 }
1338
1339 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1340 {
1341 int i;
1342
1343 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1344 if (vendor->vendor_class[i])
1345 return 1;
1346
1347 return 0;
1348 }
1349
1350 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1351 struct ib_mad_agent_private *agent)
1352 {
1353 int i;
1354
1355 /* Remove any methods for this mad agent */
1356 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1357 if (method->agent[i] == agent) {
1358 method->agent[i] = NULL;
1359 }
1360 }
1361 }
1362
1363 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1364 struct ib_mad_agent_private *agent_priv,
1365 u8 mgmt_class)
1366 {
1367 struct ib_mad_port_private *port_priv;
1368 struct ib_mad_mgmt_class_table **class;
1369 struct ib_mad_mgmt_method_table **method;
1370 int i, ret;
1371
1372 port_priv = agent_priv->qp_info->port_priv;
1373 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1374 if (!*class) {
1375 /* Allocate management class table for "new" class version */
1376 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1377 if (!*class) {
1378 dev_err(&agent_priv->agent.device->dev,
1379 "No memory for ib_mad_mgmt_class_table\n");
1380 ret = -ENOMEM;
1381 goto error1;
1382 }
1383
1384 /* Allocate method table for this management class */
1385 method = &(*class)->method_table[mgmt_class];
1386 if ((ret = allocate_method_table(method)))
1387 goto error2;
1388 } else {
1389 method = &(*class)->method_table[mgmt_class];
1390 if (!*method) {
1391 /* Allocate method table for this management class */
1392 if ((ret = allocate_method_table(method)))
1393 goto error1;
1394 }
1395 }
1396
1397 /* Now, make sure methods are not already in use */
1398 if (method_in_use(method, mad_reg_req))
1399 goto error3;
1400
1401 /* Finally, add in methods being registered */
1402 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1403 (*method)->agent[i] = agent_priv;
1404
1405 return 0;
1406
1407 error3:
1408 /* Remove any methods for this mad agent */
1409 remove_methods_mad_agent(*method, agent_priv);
1410 /* Now, check to see if there are any methods in use */
1411 if (!check_method_table(*method)) {
1412 /* If not, release management method table */
1413 kfree(*method);
1414 *method = NULL;
1415 }
1416 ret = -EINVAL;
1417 goto error1;
1418 error2:
1419 kfree(*class);
1420 *class = NULL;
1421 error1:
1422 return ret;
1423 }
1424
1425 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1426 struct ib_mad_agent_private *agent_priv)
1427 {
1428 struct ib_mad_port_private *port_priv;
1429 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1430 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1431 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1432 struct ib_mad_mgmt_method_table **method;
1433 int i, ret = -ENOMEM;
1434 u8 vclass;
1435
1436 /* "New" vendor (with OUI) class */
1437 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1438 port_priv = agent_priv->qp_info->port_priv;
1439 vendor_table = &port_priv->version[
1440 mad_reg_req->mgmt_class_version].vendor;
1441 if (!*vendor_table) {
1442 /* Allocate mgmt vendor class table for "new" class version */
1443 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1444 if (!vendor) {
1445 dev_err(&agent_priv->agent.device->dev,
1446 "No memory for ib_mad_mgmt_vendor_class_table\n");
1447 goto error1;
1448 }
1449
1450 *vendor_table = vendor;
1451 }
1452 if (!(*vendor_table)->vendor_class[vclass]) {
1453 /* Allocate table for this management vendor class */
1454 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1455 if (!vendor_class) {
1456 dev_err(&agent_priv->agent.device->dev,
1457 "No memory for ib_mad_mgmt_vendor_class\n");
1458 goto error2;
1459 }
1460
1461 (*vendor_table)->vendor_class[vclass] = vendor_class;
1462 }
1463 for (i = 0; i < MAX_MGMT_OUI; i++) {
1464 /* Is there matching OUI for this vendor class ? */
1465 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1466 mad_reg_req->oui, 3)) {
1467 method = &(*vendor_table)->vendor_class[
1468 vclass]->method_table[i];
1469 BUG_ON(!*method);
1470 goto check_in_use;
1471 }
1472 }
1473 for (i = 0; i < MAX_MGMT_OUI; i++) {
1474 /* OUI slot available ? */
1475 if (!is_vendor_oui((*vendor_table)->vendor_class[
1476 vclass]->oui[i])) {
1477 method = &(*vendor_table)->vendor_class[
1478 vclass]->method_table[i];
1479 BUG_ON(*method);
1480 /* Allocate method table for this OUI */
1481 if ((ret = allocate_method_table(method)))
1482 goto error3;
1483 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1484 mad_reg_req->oui, 3);
1485 goto check_in_use;
1486 }
1487 }
1488 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1489 goto error3;
1490
1491 check_in_use:
1492 /* Now, make sure methods are not already in use */
1493 if (method_in_use(method, mad_reg_req))
1494 goto error4;
1495
1496 /* Finally, add in methods being registered */
1497 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1498 (*method)->agent[i] = agent_priv;
1499
1500 return 0;
1501
1502 error4:
1503 /* Remove any methods for this mad agent */
1504 remove_methods_mad_agent(*method, agent_priv);
1505 /* Now, check to see if there are any methods in use */
1506 if (!check_method_table(*method)) {
1507 /* If not, release management method table */
1508 kfree(*method);
1509 *method = NULL;
1510 }
1511 ret = -EINVAL;
1512 error3:
1513 if (vendor_class) {
1514 (*vendor_table)->vendor_class[vclass] = NULL;
1515 kfree(vendor_class);
1516 }
1517 error2:
1518 if (vendor) {
1519 *vendor_table = NULL;
1520 kfree(vendor);
1521 }
1522 error1:
1523 return ret;
1524 }
1525
1526 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1527 {
1528 struct ib_mad_port_private *port_priv;
1529 struct ib_mad_mgmt_class_table *class;
1530 struct ib_mad_mgmt_method_table *method;
1531 struct ib_mad_mgmt_vendor_class_table *vendor;
1532 struct ib_mad_mgmt_vendor_class *vendor_class;
1533 int index;
1534 u8 mgmt_class;
1535
1536 /*
1537 * Was MAD registration request supplied
1538 * with original registration ?
1539 */
1540 if (!agent_priv->reg_req) {
1541 goto out;
1542 }
1543
1544 port_priv = agent_priv->qp_info->port_priv;
1545 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1546 class = port_priv->version[
1547 agent_priv->reg_req->mgmt_class_version].class;
1548 if (!class)
1549 goto vendor_check;
1550
1551 method = class->method_table[mgmt_class];
1552 if (method) {
1553 /* Remove any methods for this mad agent */
1554 remove_methods_mad_agent(method, agent_priv);
1555 /* Now, check to see if there are any methods still in use */
1556 if (!check_method_table(method)) {
1557 /* If not, release management method table */
1558 kfree(method);
1559 class->method_table[mgmt_class] = NULL;
1560 /* Any management classes left ? */
1561 if (!check_class_table(class)) {
1562 /* If not, release management class table */
1563 kfree(class);
1564 port_priv->version[
1565 agent_priv->reg_req->
1566 mgmt_class_version].class = NULL;
1567 }
1568 }
1569 }
1570
1571 vendor_check:
1572 if (!is_vendor_class(mgmt_class))
1573 goto out;
1574
1575 /* normalize mgmt_class to vendor range 2 */
1576 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1577 vendor = port_priv->version[
1578 agent_priv->reg_req->mgmt_class_version].vendor;
1579
1580 if (!vendor)
1581 goto out;
1582
1583 vendor_class = vendor->vendor_class[mgmt_class];
1584 if (vendor_class) {
1585 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1586 if (index < 0)
1587 goto out;
1588 method = vendor_class->method_table[index];
1589 if (method) {
1590 /* Remove any methods for this mad agent */
1591 remove_methods_mad_agent(method, agent_priv);
1592 /*
1593 * Now, check to see if there are
1594 * any methods still in use
1595 */
1596 if (!check_method_table(method)) {
1597 /* If not, release management method table */
1598 kfree(method);
1599 vendor_class->method_table[index] = NULL;
1600 memset(vendor_class->oui[index], 0, 3);
1601 /* Any OUIs left ? */
1602 if (!check_vendor_class(vendor_class)) {
1603 /* If not, release vendor class table */
1604 kfree(vendor_class);
1605 vendor->vendor_class[mgmt_class] = NULL;
1606 /* Any other vendor classes left ? */
1607 if (!check_vendor_table(vendor)) {
1608 kfree(vendor);
1609 port_priv->version[
1610 agent_priv->reg_req->
1611 mgmt_class_version].
1612 vendor = NULL;
1613 }
1614 }
1615 }
1616 }
1617 }
1618
1619 out:
1620 return;
1621 }
1622
1623 static struct ib_mad_agent_private *
1624 find_mad_agent(struct ib_mad_port_private *port_priv,
1625 struct ib_mad *mad)
1626 {
1627 struct ib_mad_agent_private *mad_agent = NULL;
1628 unsigned long flags;
1629
1630 spin_lock_irqsave(&port_priv->reg_lock, flags);
1631 if (ib_response_mad(mad)) {
1632 u32 hi_tid;
1633 struct ib_mad_agent_private *entry;
1634
1635 /*
1636 * Routing is based on high 32 bits of transaction ID
1637 * of MAD.
1638 */
1639 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1640 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1641 if (entry->agent.hi_tid == hi_tid) {
1642 mad_agent = entry;
1643 break;
1644 }
1645 }
1646 } else {
1647 struct ib_mad_mgmt_class_table *class;
1648 struct ib_mad_mgmt_method_table *method;
1649 struct ib_mad_mgmt_vendor_class_table *vendor;
1650 struct ib_mad_mgmt_vendor_class *vendor_class;
1651 struct ib_vendor_mad *vendor_mad;
1652 int index;
1653
1654 /*
1655 * Routing is based on version, class, and method
1656 * For "newer" vendor MADs, also based on OUI
1657 */
1658 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1659 goto out;
1660 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1661 class = port_priv->version[
1662 mad->mad_hdr.class_version].class;
1663 if (!class)
1664 goto out;
1665 if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
1666 IB_MGMT_MAX_METHODS)
1667 goto out;
1668 method = class->method_table[convert_mgmt_class(
1669 mad->mad_hdr.mgmt_class)];
1670 if (method)
1671 mad_agent = method->agent[mad->mad_hdr.method &
1672 ~IB_MGMT_METHOD_RESP];
1673 } else {
1674 vendor = port_priv->version[
1675 mad->mad_hdr.class_version].vendor;
1676 if (!vendor)
1677 goto out;
1678 vendor_class = vendor->vendor_class[vendor_class_index(
1679 mad->mad_hdr.mgmt_class)];
1680 if (!vendor_class)
1681 goto out;
1682 /* Find matching OUI */
1683 vendor_mad = (struct ib_vendor_mad *)mad;
1684 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1685 if (index == -1)
1686 goto out;
1687 method = vendor_class->method_table[index];
1688 if (method) {
1689 mad_agent = method->agent[mad->mad_hdr.method &
1690 ~IB_MGMT_METHOD_RESP];
1691 }
1692 }
1693 }
1694
1695 if (mad_agent) {
1696 if (mad_agent->agent.recv_handler)
1697 atomic_inc(&mad_agent->refcount);
1698 else {
1699 dev_notice(&port_priv->device->dev,
1700 "No receive handler for client %p on port %d\n",
1701 &mad_agent->agent, port_priv->port_num);
1702 mad_agent = NULL;
1703 }
1704 }
1705 out:
1706 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1707
1708 return mad_agent;
1709 }
1710
1711 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1712 {
1713 int valid = 0;
1714
1715 /* Make sure MAD base version is understood */
1716 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1717 pr_err("MAD received with unsupported base version %d\n",
1718 mad->mad_hdr.base_version);
1719 goto out;
1720 }
1721
1722 /* Filter SMI packets sent to other than QP0 */
1723 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1724 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1725 if (qp_num == 0)
1726 valid = 1;
1727 } else {
1728 /* Filter GSI packets sent to QP0 */
1729 if (qp_num != 0)
1730 valid = 1;
1731 }
1732
1733 out:
1734 return valid;
1735 }
1736
1737 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1738 struct ib_mad_hdr *mad_hdr)
1739 {
1740 struct ib_rmpp_mad *rmpp_mad;
1741
1742 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1743 return !mad_agent_priv->agent.rmpp_version ||
1744 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1745 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1746 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1747 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1748 }
1749
1750 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1751 struct ib_mad_recv_wc *rwc)
1752 {
1753 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1754 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1755 }
1756
1757 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1758 struct ib_mad_send_wr_private *wr,
1759 struct ib_mad_recv_wc *rwc )
1760 {
1761 struct ib_ah_attr attr;
1762 u8 send_resp, rcv_resp;
1763 union ib_gid sgid;
1764 struct ib_device *device = mad_agent_priv->agent.device;
1765 u8 port_num = mad_agent_priv->agent.port_num;
1766 u8 lmc;
1767
1768 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1769 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1770
1771 if (send_resp == rcv_resp)
1772 /* both requests, or both responses. GIDs different */
1773 return 0;
1774
1775 if (ib_query_ah(wr->send_buf.ah, &attr))
1776 /* Assume not equal, to avoid false positives. */
1777 return 0;
1778
1779 if (!!(attr.ah_flags & IB_AH_GRH) !=
1780 !!(rwc->wc->wc_flags & IB_WC_GRH))
1781 /* one has GID, other does not. Assume different */
1782 return 0;
1783
1784 if (!send_resp && rcv_resp) {
1785 /* is request/response. */
1786 if (!(attr.ah_flags & IB_AH_GRH)) {
1787 if (ib_get_cached_lmc(device, port_num, &lmc))
1788 return 0;
1789 return (!lmc || !((attr.src_path_bits ^
1790 rwc->wc->dlid_path_bits) &
1791 ((1 << lmc) - 1)));
1792 } else {
1793 if (ib_get_cached_gid(device, port_num,
1794 attr.grh.sgid_index, &sgid))
1795 return 0;
1796 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1797 16);
1798 }
1799 }
1800
1801 if (!(attr.ah_flags & IB_AH_GRH))
1802 return attr.dlid == rwc->wc->slid;
1803 else
1804 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1805 16);
1806 }
1807
1808 static inline int is_direct(u8 class)
1809 {
1810 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1811 }
1812
1813 struct ib_mad_send_wr_private*
1814 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1815 struct ib_mad_recv_wc *wc)
1816 {
1817 struct ib_mad_send_wr_private *wr;
1818 struct ib_mad *mad;
1819
1820 mad = (struct ib_mad *)wc->recv_buf.mad;
1821
1822 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1823 if ((wr->tid == mad->mad_hdr.tid) &&
1824 rcv_has_same_class(wr, wc) &&
1825 /*
1826 * Don't check GID for direct routed MADs.
1827 * These might have permissive LIDs.
1828 */
1829 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1830 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1831 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1832 }
1833
1834 /*
1835 * It's possible to receive the response before we've
1836 * been notified that the send has completed
1837 */
1838 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1839 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1840 wr->tid == mad->mad_hdr.tid &&
1841 wr->timeout &&
1842 rcv_has_same_class(wr, wc) &&
1843 /*
1844 * Don't check GID for direct routed MADs.
1845 * These might have permissive LIDs.
1846 */
1847 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1848 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1849 /* Verify request has not been canceled */
1850 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1851 }
1852 return NULL;
1853 }
1854
1855 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1856 {
1857 mad_send_wr->timeout = 0;
1858 if (mad_send_wr->refcount == 1)
1859 list_move_tail(&mad_send_wr->agent_list,
1860 &mad_send_wr->mad_agent_priv->done_list);
1861 }
1862
1863 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1864 struct ib_mad_recv_wc *mad_recv_wc)
1865 {
1866 struct ib_mad_send_wr_private *mad_send_wr;
1867 struct ib_mad_send_wc mad_send_wc;
1868 unsigned long flags;
1869
1870 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1871 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1872 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1873 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1874 mad_recv_wc);
1875 if (!mad_recv_wc) {
1876 deref_mad_agent(mad_agent_priv);
1877 return;
1878 }
1879 }
1880
1881 /* Complete corresponding request */
1882 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1883 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1884 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1885 if (!mad_send_wr) {
1886 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1887 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1888 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1889 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1890 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1891 /* user rmpp is in effect
1892 * and this is an active RMPP MAD
1893 */
1894 mad_recv_wc->wc->wr_id = 0;
1895 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1896 mad_recv_wc);
1897 atomic_dec(&mad_agent_priv->refcount);
1898 } else {
1899 /* not user rmpp, revert to normal behavior and
1900 * drop the mad */
1901 ib_free_recv_mad(mad_recv_wc);
1902 deref_mad_agent(mad_agent_priv);
1903 return;
1904 }
1905 } else {
1906 ib_mark_mad_done(mad_send_wr);
1907 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1908
1909 /* Defined behavior is to complete response before request */
1910 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1911 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1912 mad_recv_wc);
1913 atomic_dec(&mad_agent_priv->refcount);
1914
1915 mad_send_wc.status = IB_WC_SUCCESS;
1916 mad_send_wc.vendor_err = 0;
1917 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1918 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1919 }
1920 } else {
1921 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1922 mad_recv_wc);
1923 deref_mad_agent(mad_agent_priv);
1924 }
1925 }
1926
1927 static bool generate_unmatched_resp(struct ib_mad_private *recv,
1928 struct ib_mad_private *response)
1929 {
1930 if (recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_GET ||
1931 recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_SET) {
1932 memcpy(response, recv, sizeof *response);
1933 response->header.recv_wc.wc = &response->header.wc;
1934 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1935 response->header.recv_wc.recv_buf.grh = &response->grh;
1936 response->mad.mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
1937 response->mad.mad.mad_hdr.status =
1938 cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1939 if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1940 response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION;
1941
1942 return true;
1943 } else {
1944 return false;
1945 }
1946 }
1947 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1948 struct ib_wc *wc)
1949 {
1950 struct ib_mad_qp_info *qp_info;
1951 struct ib_mad_private_header *mad_priv_hdr;
1952 struct ib_mad_private *recv, *response = NULL;
1953 struct ib_mad_list_head *mad_list;
1954 struct ib_mad_agent_private *mad_agent;
1955 int port_num;
1956 int ret = IB_MAD_RESULT_SUCCESS;
1957
1958 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1959 qp_info = mad_list->mad_queue->qp_info;
1960 dequeue_mad(mad_list);
1961
1962 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1963 mad_list);
1964 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1965 ib_dma_unmap_single(port_priv->device,
1966 recv->header.mapping,
1967 sizeof(struct ib_mad_private) -
1968 sizeof(struct ib_mad_private_header),
1969 DMA_FROM_DEVICE);
1970
1971 /* Setup MAD receive work completion from "normal" work completion */
1972 recv->header.wc = *wc;
1973 recv->header.recv_wc.wc = &recv->header.wc;
1974 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1975 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1976 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1977
1978 if (atomic_read(&qp_info->snoop_count))
1979 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1980
1981 /* Validate MAD */
1982 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1983 goto out;
1984
1985 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1986 if (!response) {
1987 dev_err(&port_priv->device->dev,
1988 "ib_mad_recv_done_handler no memory for response buffer\n");
1989 goto out;
1990 }
1991
1992 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1993 port_num = wc->port_num;
1994 else
1995 port_num = port_priv->port_num;
1996
1997 if (recv->mad.mad.mad_hdr.mgmt_class ==
1998 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1999 enum smi_forward_action retsmi;
2000
2001 if (smi_handle_dr_smp_recv(&recv->mad.smp,
2002 port_priv->device->node_type,
2003 port_num,
2004 port_priv->device->phys_port_cnt) ==
2005 IB_SMI_DISCARD)
2006 goto out;
2007
2008 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
2009 if (retsmi == IB_SMI_LOCAL)
2010 goto local;
2011
2012 if (retsmi == IB_SMI_SEND) { /* don't forward */
2013 if (smi_handle_dr_smp_send(&recv->mad.smp,
2014 port_priv->device->node_type,
2015 port_num) == IB_SMI_DISCARD)
2016 goto out;
2017
2018 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
2019 goto out;
2020 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
2021 /* forward case for switches */
2022 memcpy(response, recv, sizeof(*response));
2023 response->header.recv_wc.wc = &response->header.wc;
2024 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
2025 response->header.recv_wc.recv_buf.grh = &response->grh;
2026
2027 agent_send_response(&response->mad.mad,
2028 &response->grh, wc,
2029 port_priv->device,
2030 smi_get_fwd_port(&recv->mad.smp),
2031 qp_info->qp->qp_num);
2032
2033 goto out;
2034 }
2035 }
2036
2037 local:
2038 /* Give driver "right of first refusal" on incoming MAD */
2039 if (port_priv->device->process_mad) {
2040 ret = port_priv->device->process_mad(port_priv->device, 0,
2041 port_priv->port_num,
2042 wc, &recv->grh,
2043 &recv->mad.mad,
2044 &response->mad.mad);
2045 if (ret & IB_MAD_RESULT_SUCCESS) {
2046 if (ret & IB_MAD_RESULT_CONSUMED)
2047 goto out;
2048 if (ret & IB_MAD_RESULT_REPLY) {
2049 agent_send_response(&response->mad.mad,
2050 &recv->grh, wc,
2051 port_priv->device,
2052 port_num,
2053 qp_info->qp->qp_num);
2054 goto out;
2055 }
2056 }
2057 }
2058
2059 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
2060 if (mad_agent) {
2061 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2062 /*
2063 * recv is freed up in error cases in ib_mad_complete_recv
2064 * or via recv_handler in ib_mad_complete_recv()
2065 */
2066 recv = NULL;
2067 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2068 generate_unmatched_resp(recv, response)) {
2069 agent_send_response(&response->mad.mad, &recv->grh, wc,
2070 port_priv->device, port_num, qp_info->qp->qp_num);
2071 }
2072
2073 out:
2074 /* Post another receive request for this QP */
2075 if (response) {
2076 ib_mad_post_receive_mads(qp_info, response);
2077 if (recv)
2078 kmem_cache_free(ib_mad_cache, recv);
2079 } else
2080 ib_mad_post_receive_mads(qp_info, recv);
2081 }
2082
2083 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2084 {
2085 struct ib_mad_send_wr_private *mad_send_wr;
2086 unsigned long delay;
2087
2088 if (list_empty(&mad_agent_priv->wait_list)) {
2089 cancel_delayed_work(&mad_agent_priv->timed_work);
2090 } else {
2091 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2092 struct ib_mad_send_wr_private,
2093 agent_list);
2094
2095 if (time_after(mad_agent_priv->timeout,
2096 mad_send_wr->timeout)) {
2097 mad_agent_priv->timeout = mad_send_wr->timeout;
2098 delay = mad_send_wr->timeout - jiffies;
2099 if ((long)delay <= 0)
2100 delay = 1;
2101 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2102 &mad_agent_priv->timed_work, delay);
2103 }
2104 }
2105 }
2106
2107 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2108 {
2109 struct ib_mad_agent_private *mad_agent_priv;
2110 struct ib_mad_send_wr_private *temp_mad_send_wr;
2111 struct list_head *list_item;
2112 unsigned long delay;
2113
2114 mad_agent_priv = mad_send_wr->mad_agent_priv;
2115 list_del(&mad_send_wr->agent_list);
2116
2117 delay = mad_send_wr->timeout;
2118 mad_send_wr->timeout += jiffies;
2119
2120 if (delay) {
2121 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2122 temp_mad_send_wr = list_entry(list_item,
2123 struct ib_mad_send_wr_private,
2124 agent_list);
2125 if (time_after(mad_send_wr->timeout,
2126 temp_mad_send_wr->timeout))
2127 break;
2128 }
2129 }
2130 else
2131 list_item = &mad_agent_priv->wait_list;
2132 list_add(&mad_send_wr->agent_list, list_item);
2133
2134 /* Reschedule a work item if we have a shorter timeout */
2135 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2136 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2137 &mad_agent_priv->timed_work, delay);
2138 }
2139
2140 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2141 int timeout_ms)
2142 {
2143 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2144 wait_for_response(mad_send_wr);
2145 }
2146
2147 /*
2148 * Process a send work completion
2149 */
2150 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2151 struct ib_mad_send_wc *mad_send_wc)
2152 {
2153 struct ib_mad_agent_private *mad_agent_priv;
2154 unsigned long flags;
2155 int ret;
2156
2157 mad_agent_priv = mad_send_wr->mad_agent_priv;
2158 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2159 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2160 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2161 if (ret == IB_RMPP_RESULT_CONSUMED)
2162 goto done;
2163 } else
2164 ret = IB_RMPP_RESULT_UNHANDLED;
2165
2166 if (mad_send_wc->status != IB_WC_SUCCESS &&
2167 mad_send_wr->status == IB_WC_SUCCESS) {
2168 mad_send_wr->status = mad_send_wc->status;
2169 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2170 }
2171
2172 if (--mad_send_wr->refcount > 0) {
2173 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2174 mad_send_wr->status == IB_WC_SUCCESS) {
2175 wait_for_response(mad_send_wr);
2176 }
2177 goto done;
2178 }
2179
2180 /* Remove send from MAD agent and notify client of completion */
2181 list_del(&mad_send_wr->agent_list);
2182 adjust_timeout(mad_agent_priv);
2183 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2184
2185 if (mad_send_wr->status != IB_WC_SUCCESS )
2186 mad_send_wc->status = mad_send_wr->status;
2187 if (ret == IB_RMPP_RESULT_INTERNAL)
2188 ib_rmpp_send_handler(mad_send_wc);
2189 else
2190 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2191 mad_send_wc);
2192
2193 /* Release reference on agent taken when sending */
2194 deref_mad_agent(mad_agent_priv);
2195 return;
2196 done:
2197 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2198 }
2199
2200 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2201 struct ib_wc *wc)
2202 {
2203 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2204 struct ib_mad_list_head *mad_list;
2205 struct ib_mad_qp_info *qp_info;
2206 struct ib_mad_queue *send_queue;
2207 struct ib_send_wr *bad_send_wr;
2208 struct ib_mad_send_wc mad_send_wc;
2209 unsigned long flags;
2210 int ret;
2211
2212 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2213 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2214 mad_list);
2215 send_queue = mad_list->mad_queue;
2216 qp_info = send_queue->qp_info;
2217
2218 retry:
2219 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2220 mad_send_wr->header_mapping,
2221 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2222 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2223 mad_send_wr->payload_mapping,
2224 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2225 queued_send_wr = NULL;
2226 spin_lock_irqsave(&send_queue->lock, flags);
2227 list_del(&mad_list->list);
2228
2229 /* Move queued send to the send queue */
2230 if (send_queue->count-- > send_queue->max_active) {
2231 mad_list = container_of(qp_info->overflow_list.next,
2232 struct ib_mad_list_head, list);
2233 queued_send_wr = container_of(mad_list,
2234 struct ib_mad_send_wr_private,
2235 mad_list);
2236 list_move_tail(&mad_list->list, &send_queue->list);
2237 }
2238 spin_unlock_irqrestore(&send_queue->lock, flags);
2239
2240 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2241 mad_send_wc.status = wc->status;
2242 mad_send_wc.vendor_err = wc->vendor_err;
2243 if (atomic_read(&qp_info->snoop_count))
2244 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2245 IB_MAD_SNOOP_SEND_COMPLETIONS);
2246 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2247
2248 if (queued_send_wr) {
2249 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2250 &bad_send_wr);
2251 if (ret) {
2252 dev_err(&port_priv->device->dev,
2253 "ib_post_send failed: %d\n", ret);
2254 mad_send_wr = queued_send_wr;
2255 wc->status = IB_WC_LOC_QP_OP_ERR;
2256 goto retry;
2257 }
2258 }
2259 }
2260
2261 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2262 {
2263 struct ib_mad_send_wr_private *mad_send_wr;
2264 struct ib_mad_list_head *mad_list;
2265 unsigned long flags;
2266
2267 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2268 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2269 mad_send_wr = container_of(mad_list,
2270 struct ib_mad_send_wr_private,
2271 mad_list);
2272 mad_send_wr->retry = 1;
2273 }
2274 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2275 }
2276
2277 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2278 struct ib_wc *wc)
2279 {
2280 struct ib_mad_list_head *mad_list;
2281 struct ib_mad_qp_info *qp_info;
2282 struct ib_mad_send_wr_private *mad_send_wr;
2283 int ret;
2284
2285 /* Determine if failure was a send or receive */
2286 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2287 qp_info = mad_list->mad_queue->qp_info;
2288 if (mad_list->mad_queue == &qp_info->recv_queue)
2289 /*
2290 * Receive errors indicate that the QP has entered the error
2291 * state - error handling/shutdown code will cleanup
2292 */
2293 return;
2294
2295 /*
2296 * Send errors will transition the QP to SQE - move
2297 * QP to RTS and repost flushed work requests
2298 */
2299 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2300 mad_list);
2301 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2302 if (mad_send_wr->retry) {
2303 /* Repost send */
2304 struct ib_send_wr *bad_send_wr;
2305
2306 mad_send_wr->retry = 0;
2307 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2308 &bad_send_wr);
2309 if (ret)
2310 ib_mad_send_done_handler(port_priv, wc);
2311 } else
2312 ib_mad_send_done_handler(port_priv, wc);
2313 } else {
2314 struct ib_qp_attr *attr;
2315
2316 /* Transition QP to RTS and fail offending send */
2317 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2318 if (attr) {
2319 attr->qp_state = IB_QPS_RTS;
2320 attr->cur_qp_state = IB_QPS_SQE;
2321 ret = ib_modify_qp(qp_info->qp, attr,
2322 IB_QP_STATE | IB_QP_CUR_STATE);
2323 kfree(attr);
2324 if (ret)
2325 dev_err(&port_priv->device->dev,
2326 "mad_error_handler - ib_modify_qp to RTS : %d\n",
2327 ret);
2328 else
2329 mark_sends_for_retry(qp_info);
2330 }
2331 ib_mad_send_done_handler(port_priv, wc);
2332 }
2333 }
2334
2335 /*
2336 * IB MAD completion callback
2337 */
2338 static void ib_mad_completion_handler(struct work_struct *work)
2339 {
2340 struct ib_mad_port_private *port_priv;
2341 struct ib_wc wc;
2342
2343 port_priv = container_of(work, struct ib_mad_port_private, work);
2344 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2345
2346 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2347 if (wc.status == IB_WC_SUCCESS) {
2348 switch (wc.opcode) {
2349 case IB_WC_SEND:
2350 ib_mad_send_done_handler(port_priv, &wc);
2351 break;
2352 case IB_WC_RECV:
2353 ib_mad_recv_done_handler(port_priv, &wc);
2354 break;
2355 default:
2356 BUG_ON(1);
2357 break;
2358 }
2359 } else
2360 mad_error_handler(port_priv, &wc);
2361 }
2362 }
2363
2364 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2365 {
2366 unsigned long flags;
2367 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2368 struct ib_mad_send_wc mad_send_wc;
2369 struct list_head cancel_list;
2370
2371 INIT_LIST_HEAD(&cancel_list);
2372
2373 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2374 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2375 &mad_agent_priv->send_list, agent_list) {
2376 if (mad_send_wr->status == IB_WC_SUCCESS) {
2377 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2378 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2379 }
2380 }
2381
2382 /* Empty wait list to prevent receives from finding a request */
2383 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2384 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2385
2386 /* Report all cancelled requests */
2387 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2388 mad_send_wc.vendor_err = 0;
2389
2390 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2391 &cancel_list, agent_list) {
2392 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2393 list_del(&mad_send_wr->agent_list);
2394 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2395 &mad_send_wc);
2396 atomic_dec(&mad_agent_priv->refcount);
2397 }
2398 }
2399
2400 static struct ib_mad_send_wr_private*
2401 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2402 struct ib_mad_send_buf *send_buf)
2403 {
2404 struct ib_mad_send_wr_private *mad_send_wr;
2405
2406 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2407 agent_list) {
2408 if (&mad_send_wr->send_buf == send_buf)
2409 return mad_send_wr;
2410 }
2411
2412 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2413 agent_list) {
2414 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2415 &mad_send_wr->send_buf == send_buf)
2416 return mad_send_wr;
2417 }
2418 return NULL;
2419 }
2420
2421 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2422 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2423 {
2424 struct ib_mad_agent_private *mad_agent_priv;
2425 struct ib_mad_send_wr_private *mad_send_wr;
2426 unsigned long flags;
2427 int active;
2428
2429 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2430 agent);
2431 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2432 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2433 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2434 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2435 return -EINVAL;
2436 }
2437
2438 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2439 if (!timeout_ms) {
2440 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2441 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2442 }
2443
2444 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2445 if (active)
2446 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2447 else
2448 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2449
2450 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2451 return 0;
2452 }
2453 EXPORT_SYMBOL(ib_modify_mad);
2454
2455 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2456 struct ib_mad_send_buf *send_buf)
2457 {
2458 ib_modify_mad(mad_agent, send_buf, 0);
2459 }
2460 EXPORT_SYMBOL(ib_cancel_mad);
2461
2462 static void local_completions(struct work_struct *work)
2463 {
2464 struct ib_mad_agent_private *mad_agent_priv;
2465 struct ib_mad_local_private *local;
2466 struct ib_mad_agent_private *recv_mad_agent;
2467 unsigned long flags;
2468 int free_mad;
2469 struct ib_wc wc;
2470 struct ib_mad_send_wc mad_send_wc;
2471
2472 mad_agent_priv =
2473 container_of(work, struct ib_mad_agent_private, local_work);
2474
2475 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2476 while (!list_empty(&mad_agent_priv->local_list)) {
2477 local = list_entry(mad_agent_priv->local_list.next,
2478 struct ib_mad_local_private,
2479 completion_list);
2480 list_del(&local->completion_list);
2481 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2482 free_mad = 0;
2483 if (local->mad_priv) {
2484 recv_mad_agent = local->recv_mad_agent;
2485 if (!recv_mad_agent) {
2486 dev_err(&mad_agent_priv->agent.device->dev,
2487 "No receive MAD agent for local completion\n");
2488 free_mad = 1;
2489 goto local_send_completion;
2490 }
2491
2492 /*
2493 * Defined behavior is to complete response
2494 * before request
2495 */
2496 build_smp_wc(recv_mad_agent->agent.qp,
2497 (unsigned long) local->mad_send_wr,
2498 be16_to_cpu(IB_LID_PERMISSIVE),
2499 0, recv_mad_agent->agent.port_num, &wc);
2500
2501 local->mad_priv->header.recv_wc.wc = &wc;
2502 local->mad_priv->header.recv_wc.mad_len =
2503 sizeof(struct ib_mad);
2504 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2505 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2506 &local->mad_priv->header.recv_wc.rmpp_list);
2507 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2508 local->mad_priv->header.recv_wc.recv_buf.mad =
2509 &local->mad_priv->mad.mad;
2510 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2511 snoop_recv(recv_mad_agent->qp_info,
2512 &local->mad_priv->header.recv_wc,
2513 IB_MAD_SNOOP_RECVS);
2514 recv_mad_agent->agent.recv_handler(
2515 &recv_mad_agent->agent,
2516 &local->mad_priv->header.recv_wc);
2517 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2518 atomic_dec(&recv_mad_agent->refcount);
2519 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2520 }
2521
2522 local_send_completion:
2523 /* Complete send */
2524 mad_send_wc.status = IB_WC_SUCCESS;
2525 mad_send_wc.vendor_err = 0;
2526 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2527 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2528 snoop_send(mad_agent_priv->qp_info,
2529 &local->mad_send_wr->send_buf,
2530 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2531 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2532 &mad_send_wc);
2533
2534 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2535 atomic_dec(&mad_agent_priv->refcount);
2536 if (free_mad)
2537 kmem_cache_free(ib_mad_cache, local->mad_priv);
2538 kfree(local);
2539 }
2540 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2541 }
2542
2543 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2544 {
2545 int ret;
2546
2547 if (!mad_send_wr->retries_left)
2548 return -ETIMEDOUT;
2549
2550 mad_send_wr->retries_left--;
2551 mad_send_wr->send_buf.retries++;
2552
2553 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2554
2555 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2556 ret = ib_retry_rmpp(mad_send_wr);
2557 switch (ret) {
2558 case IB_RMPP_RESULT_UNHANDLED:
2559 ret = ib_send_mad(mad_send_wr);
2560 break;
2561 case IB_RMPP_RESULT_CONSUMED:
2562 ret = 0;
2563 break;
2564 default:
2565 ret = -ECOMM;
2566 break;
2567 }
2568 } else
2569 ret = ib_send_mad(mad_send_wr);
2570
2571 if (!ret) {
2572 mad_send_wr->refcount++;
2573 list_add_tail(&mad_send_wr->agent_list,
2574 &mad_send_wr->mad_agent_priv->send_list);
2575 }
2576 return ret;
2577 }
2578
2579 static void timeout_sends(struct work_struct *work)
2580 {
2581 struct ib_mad_agent_private *mad_agent_priv;
2582 struct ib_mad_send_wr_private *mad_send_wr;
2583 struct ib_mad_send_wc mad_send_wc;
2584 unsigned long flags, delay;
2585
2586 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2587 timed_work.work);
2588 mad_send_wc.vendor_err = 0;
2589
2590 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2591 while (!list_empty(&mad_agent_priv->wait_list)) {
2592 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2593 struct ib_mad_send_wr_private,
2594 agent_list);
2595
2596 if (time_after(mad_send_wr->timeout, jiffies)) {
2597 delay = mad_send_wr->timeout - jiffies;
2598 if ((long)delay <= 0)
2599 delay = 1;
2600 queue_delayed_work(mad_agent_priv->qp_info->
2601 port_priv->wq,
2602 &mad_agent_priv->timed_work, delay);
2603 break;
2604 }
2605
2606 list_del(&mad_send_wr->agent_list);
2607 if (mad_send_wr->status == IB_WC_SUCCESS &&
2608 !retry_send(mad_send_wr))
2609 continue;
2610
2611 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2612
2613 if (mad_send_wr->status == IB_WC_SUCCESS)
2614 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2615 else
2616 mad_send_wc.status = mad_send_wr->status;
2617 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2618 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2619 &mad_send_wc);
2620
2621 atomic_dec(&mad_agent_priv->refcount);
2622 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2623 }
2624 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2625 }
2626
2627 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2628 {
2629 struct ib_mad_port_private *port_priv = cq->cq_context;
2630 unsigned long flags;
2631
2632 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2633 if (!list_empty(&port_priv->port_list))
2634 queue_work(port_priv->wq, &port_priv->work);
2635 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2636 }
2637
2638 /*
2639 * Allocate receive MADs and post receive WRs for them
2640 */
2641 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2642 struct ib_mad_private *mad)
2643 {
2644 unsigned long flags;
2645 int post, ret;
2646 struct ib_mad_private *mad_priv;
2647 struct ib_sge sg_list;
2648 struct ib_recv_wr recv_wr, *bad_recv_wr;
2649 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2650
2651 /* Initialize common scatter list fields */
2652 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2653 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2654
2655 /* Initialize common receive WR fields */
2656 recv_wr.next = NULL;
2657 recv_wr.sg_list = &sg_list;
2658 recv_wr.num_sge = 1;
2659
2660 do {
2661 /* Allocate and map receive buffer */
2662 if (mad) {
2663 mad_priv = mad;
2664 mad = NULL;
2665 } else {
2666 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2667 if (!mad_priv) {
2668 dev_err(&qp_info->port_priv->device->dev,
2669 "No memory for receive buffer\n");
2670 ret = -ENOMEM;
2671 break;
2672 }
2673 }
2674 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2675 &mad_priv->grh,
2676 sizeof *mad_priv -
2677 sizeof mad_priv->header,
2678 DMA_FROM_DEVICE);
2679 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2680 sg_list.addr))) {
2681 ret = -ENOMEM;
2682 break;
2683 }
2684 mad_priv->header.mapping = sg_list.addr;
2685 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2686 mad_priv->header.mad_list.mad_queue = recv_queue;
2687
2688 /* Post receive WR */
2689 spin_lock_irqsave(&recv_queue->lock, flags);
2690 post = (++recv_queue->count < recv_queue->max_active);
2691 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2692 spin_unlock_irqrestore(&recv_queue->lock, flags);
2693 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2694 if (ret) {
2695 spin_lock_irqsave(&recv_queue->lock, flags);
2696 list_del(&mad_priv->header.mad_list.list);
2697 recv_queue->count--;
2698 spin_unlock_irqrestore(&recv_queue->lock, flags);
2699 ib_dma_unmap_single(qp_info->port_priv->device,
2700 mad_priv->header.mapping,
2701 sizeof *mad_priv -
2702 sizeof mad_priv->header,
2703 DMA_FROM_DEVICE);
2704 kmem_cache_free(ib_mad_cache, mad_priv);
2705 dev_err(&qp_info->port_priv->device->dev,
2706 "ib_post_recv failed: %d\n", ret);
2707 break;
2708 }
2709 } while (post);
2710
2711 return ret;
2712 }
2713
2714 /*
2715 * Return all the posted receive MADs
2716 */
2717 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2718 {
2719 struct ib_mad_private_header *mad_priv_hdr;
2720 struct ib_mad_private *recv;
2721 struct ib_mad_list_head *mad_list;
2722
2723 if (!qp_info->qp)
2724 return;
2725
2726 while (!list_empty(&qp_info->recv_queue.list)) {
2727
2728 mad_list = list_entry(qp_info->recv_queue.list.next,
2729 struct ib_mad_list_head, list);
2730 mad_priv_hdr = container_of(mad_list,
2731 struct ib_mad_private_header,
2732 mad_list);
2733 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2734 header);
2735
2736 /* Remove from posted receive MAD list */
2737 list_del(&mad_list->list);
2738
2739 ib_dma_unmap_single(qp_info->port_priv->device,
2740 recv->header.mapping,
2741 sizeof(struct ib_mad_private) -
2742 sizeof(struct ib_mad_private_header),
2743 DMA_FROM_DEVICE);
2744 kmem_cache_free(ib_mad_cache, recv);
2745 }
2746
2747 qp_info->recv_queue.count = 0;
2748 }
2749
2750 /*
2751 * Start the port
2752 */
2753 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2754 {
2755 int ret, i;
2756 struct ib_qp_attr *attr;
2757 struct ib_qp *qp;
2758 u16 pkey_index;
2759
2760 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2761 if (!attr) {
2762 dev_err(&port_priv->device->dev,
2763 "Couldn't kmalloc ib_qp_attr\n");
2764 return -ENOMEM;
2765 }
2766
2767 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2768 IB_DEFAULT_PKEY_FULL, &pkey_index);
2769 if (ret)
2770 pkey_index = 0;
2771
2772 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2773 qp = port_priv->qp_info[i].qp;
2774 if (!qp)
2775 continue;
2776
2777 /*
2778 * PKey index for QP1 is irrelevant but
2779 * one is needed for the Reset to Init transition
2780 */
2781 attr->qp_state = IB_QPS_INIT;
2782 attr->pkey_index = pkey_index;
2783 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2784 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2785 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2786 if (ret) {
2787 dev_err(&port_priv->device->dev,
2788 "Couldn't change QP%d state to INIT: %d\n",
2789 i, ret);
2790 goto out;
2791 }
2792
2793 attr->qp_state = IB_QPS_RTR;
2794 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2795 if (ret) {
2796 dev_err(&port_priv->device->dev,
2797 "Couldn't change QP%d state to RTR: %d\n",
2798 i, ret);
2799 goto out;
2800 }
2801
2802 attr->qp_state = IB_QPS_RTS;
2803 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2804 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2805 if (ret) {
2806 dev_err(&port_priv->device->dev,
2807 "Couldn't change QP%d state to RTS: %d\n",
2808 i, ret);
2809 goto out;
2810 }
2811 }
2812
2813 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2814 if (ret) {
2815 dev_err(&port_priv->device->dev,
2816 "Failed to request completion notification: %d\n",
2817 ret);
2818 goto out;
2819 }
2820
2821 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2822 if (!port_priv->qp_info[i].qp)
2823 continue;
2824
2825 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2826 if (ret) {
2827 dev_err(&port_priv->device->dev,
2828 "Couldn't post receive WRs\n");
2829 goto out;
2830 }
2831 }
2832 out:
2833 kfree(attr);
2834 return ret;
2835 }
2836
2837 static void qp_event_handler(struct ib_event *event, void *qp_context)
2838 {
2839 struct ib_mad_qp_info *qp_info = qp_context;
2840
2841 /* It's worse than that! He's dead, Jim! */
2842 dev_err(&qp_info->port_priv->device->dev,
2843 "Fatal error (%d) on MAD QP (%d)\n",
2844 event->event, qp_info->qp->qp_num);
2845 }
2846
2847 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2848 struct ib_mad_queue *mad_queue)
2849 {
2850 mad_queue->qp_info = qp_info;
2851 mad_queue->count = 0;
2852 spin_lock_init(&mad_queue->lock);
2853 INIT_LIST_HEAD(&mad_queue->list);
2854 }
2855
2856 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2857 struct ib_mad_qp_info *qp_info)
2858 {
2859 qp_info->port_priv = port_priv;
2860 init_mad_queue(qp_info, &qp_info->send_queue);
2861 init_mad_queue(qp_info, &qp_info->recv_queue);
2862 INIT_LIST_HEAD(&qp_info->overflow_list);
2863 spin_lock_init(&qp_info->snoop_lock);
2864 qp_info->snoop_table = NULL;
2865 qp_info->snoop_table_size = 0;
2866 atomic_set(&qp_info->snoop_count, 0);
2867 }
2868
2869 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2870 enum ib_qp_type qp_type)
2871 {
2872 struct ib_qp_init_attr qp_init_attr;
2873 int ret;
2874
2875 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2876 qp_init_attr.send_cq = qp_info->port_priv->cq;
2877 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2878 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2879 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2880 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2881 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2882 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2883 qp_init_attr.qp_type = qp_type;
2884 qp_init_attr.port_num = qp_info->port_priv->port_num;
2885 qp_init_attr.qp_context = qp_info;
2886 qp_init_attr.event_handler = qp_event_handler;
2887 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2888 if (IS_ERR(qp_info->qp)) {
2889 dev_err(&qp_info->port_priv->device->dev,
2890 "Couldn't create ib_mad QP%d\n",
2891 get_spl_qp_index(qp_type));
2892 ret = PTR_ERR(qp_info->qp);
2893 goto error;
2894 }
2895 /* Use minimum queue sizes unless the CQ is resized */
2896 qp_info->send_queue.max_active = mad_sendq_size;
2897 qp_info->recv_queue.max_active = mad_recvq_size;
2898 return 0;
2899
2900 error:
2901 return ret;
2902 }
2903
2904 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2905 {
2906 if (!qp_info->qp)
2907 return;
2908
2909 ib_destroy_qp(qp_info->qp);
2910 kfree(qp_info->snoop_table);
2911 }
2912
2913 /*
2914 * Open the port
2915 * Create the QP, PD, MR, and CQ if needed
2916 */
2917 static int ib_mad_port_open(struct ib_device *device,
2918 int port_num)
2919 {
2920 int ret, cq_size;
2921 struct ib_mad_port_private *port_priv;
2922 unsigned long flags;
2923 char name[sizeof "ib_mad123"];
2924 int has_smi;
2925
2926 /* Create new device info */
2927 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2928 if (!port_priv) {
2929 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
2930 return -ENOMEM;
2931 }
2932
2933 port_priv->device = device;
2934 port_priv->port_num = port_num;
2935 spin_lock_init(&port_priv->reg_lock);
2936 INIT_LIST_HEAD(&port_priv->agent_list);
2937 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2938 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2939
2940 cq_size = mad_sendq_size + mad_recvq_size;
2941 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2942 if (has_smi)
2943 cq_size *= 2;
2944
2945 port_priv->cq = ib_create_cq(port_priv->device,
2946 ib_mad_thread_completion_handler,
2947 NULL, port_priv, cq_size, 0);
2948 if (IS_ERR(port_priv->cq)) {
2949 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2950 ret = PTR_ERR(port_priv->cq);
2951 goto error3;
2952 }
2953
2954 port_priv->pd = ib_alloc_pd(device);
2955 if (IS_ERR(port_priv->pd)) {
2956 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2957 ret = PTR_ERR(port_priv->pd);
2958 goto error4;
2959 }
2960
2961 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2962 if (IS_ERR(port_priv->mr)) {
2963 dev_err(&device->dev, "Couldn't get ib_mad DMA MR\n");
2964 ret = PTR_ERR(port_priv->mr);
2965 goto error5;
2966 }
2967
2968 if (has_smi) {
2969 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2970 if (ret)
2971 goto error6;
2972 }
2973 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2974 if (ret)
2975 goto error7;
2976
2977 snprintf(name, sizeof name, "ib_mad%d", port_num);
2978 port_priv->wq = create_singlethread_workqueue(name);
2979 if (!port_priv->wq) {
2980 ret = -ENOMEM;
2981 goto error8;
2982 }
2983 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2984
2985 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2986 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2987 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2988
2989 ret = ib_mad_port_start(port_priv);
2990 if (ret) {
2991 dev_err(&device->dev, "Couldn't start port\n");
2992 goto error9;
2993 }
2994
2995 return 0;
2996
2997 error9:
2998 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2999 list_del_init(&port_priv->port_list);
3000 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3001
3002 destroy_workqueue(port_priv->wq);
3003 error8:
3004 destroy_mad_qp(&port_priv->qp_info[1]);
3005 error7:
3006 destroy_mad_qp(&port_priv->qp_info[0]);
3007 error6:
3008 ib_dereg_mr(port_priv->mr);
3009 error5:
3010 ib_dealloc_pd(port_priv->pd);
3011 error4:
3012 ib_destroy_cq(port_priv->cq);
3013 cleanup_recv_queue(&port_priv->qp_info[1]);
3014 cleanup_recv_queue(&port_priv->qp_info[0]);
3015 error3:
3016 kfree(port_priv);
3017
3018 return ret;
3019 }
3020
3021 /*
3022 * Close the port
3023 * If there are no classes using the port, free the port
3024 * resources (CQ, MR, PD, QP) and remove the port's info structure
3025 */
3026 static int ib_mad_port_close(struct ib_device *device, int port_num)
3027 {
3028 struct ib_mad_port_private *port_priv;
3029 unsigned long flags;
3030
3031 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3032 port_priv = __ib_get_mad_port(device, port_num);
3033 if (port_priv == NULL) {
3034 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3035 dev_err(&device->dev, "Port %d not found\n", port_num);
3036 return -ENODEV;
3037 }
3038 list_del_init(&port_priv->port_list);
3039 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3040
3041 destroy_workqueue(port_priv->wq);
3042 destroy_mad_qp(&port_priv->qp_info[1]);
3043 destroy_mad_qp(&port_priv->qp_info[0]);
3044 ib_dereg_mr(port_priv->mr);
3045 ib_dealloc_pd(port_priv->pd);
3046 ib_destroy_cq(port_priv->cq);
3047 cleanup_recv_queue(&port_priv->qp_info[1]);
3048 cleanup_recv_queue(&port_priv->qp_info[0]);
3049 /* XXX: Handle deallocation of MAD registration tables */
3050
3051 kfree(port_priv);
3052
3053 return 0;
3054 }
3055
3056 static void ib_mad_init_device(struct ib_device *device)
3057 {
3058 int start, end, i;
3059
3060 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3061 return;
3062
3063 if (device->node_type == RDMA_NODE_IB_SWITCH) {
3064 start = 0;
3065 end = 0;
3066 } else {
3067 start = 1;
3068 end = device->phys_port_cnt;
3069 }
3070
3071 for (i = start; i <= end; i++) {
3072 if (ib_mad_port_open(device, i)) {
3073 dev_err(&device->dev, "Couldn't open port %d\n", i);
3074 goto error;
3075 }
3076 if (ib_agent_port_open(device, i)) {
3077 dev_err(&device->dev,
3078 "Couldn't open port %d for agents\n", i);
3079 goto error_agent;
3080 }
3081 }
3082 return;
3083
3084 error_agent:
3085 if (ib_mad_port_close(device, i))
3086 dev_err(&device->dev, "Couldn't close port %d\n", i);
3087
3088 error:
3089 i--;
3090
3091 while (i >= start) {
3092 if (ib_agent_port_close(device, i))
3093 dev_err(&device->dev,
3094 "Couldn't close port %d for agents\n", i);
3095 if (ib_mad_port_close(device, i))
3096 dev_err(&device->dev, "Couldn't close port %d\n", i);
3097 i--;
3098 }
3099 }
3100
3101 static void ib_mad_remove_device(struct ib_device *device)
3102 {
3103 int i, num_ports, cur_port;
3104
3105 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3106 return;
3107
3108 if (device->node_type == RDMA_NODE_IB_SWITCH) {
3109 num_ports = 1;
3110 cur_port = 0;
3111 } else {
3112 num_ports = device->phys_port_cnt;
3113 cur_port = 1;
3114 }
3115 for (i = 0; i < num_ports; i++, cur_port++) {
3116 if (ib_agent_port_close(device, cur_port))
3117 dev_err(&device->dev,
3118 "Couldn't close port %d for agents\n",
3119 cur_port);
3120 if (ib_mad_port_close(device, cur_port))
3121 dev_err(&device->dev, "Couldn't close port %d\n",
3122 cur_port);
3123 }
3124 }
3125
3126 static struct ib_client mad_client = {
3127 .name = "mad",
3128 .add = ib_mad_init_device,
3129 .remove = ib_mad_remove_device
3130 };
3131
3132 static int __init ib_mad_init_module(void)
3133 {
3134 int ret;
3135
3136 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3137 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3138
3139 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3140 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3141
3142 ib_mad_cache = kmem_cache_create("ib_mad",
3143 sizeof(struct ib_mad_private),
3144 0,
3145 SLAB_HWCACHE_ALIGN,
3146 NULL);
3147 if (!ib_mad_cache) {
3148 pr_err("Couldn't create ib_mad cache\n");
3149 ret = -ENOMEM;
3150 goto error1;
3151 }
3152
3153 INIT_LIST_HEAD(&ib_mad_port_list);
3154
3155 if (ib_register_client(&mad_client)) {
3156 pr_err("Couldn't register ib_mad client\n");
3157 ret = -EINVAL;
3158 goto error2;
3159 }
3160
3161 return 0;
3162
3163 error2:
3164 kmem_cache_destroy(ib_mad_cache);
3165 error1:
3166 return ret;
3167 }
3168
3169 static void __exit ib_mad_cleanup_module(void)
3170 {
3171 ib_unregister_client(&mad_client);
3172 kmem_cache_destroy(ib_mad_cache);
3173 }
3174
3175 module_init(ib_mad_init_module);
3176 module_exit(ib_mad_cleanup_module);
Linux kernel - Deliverables
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