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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / infiniband / core / mad.c
blobc50596f7f98a52f2cdc6afacac3d98d9a7d348fb
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 * Copyright (c) 2014 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 *
36 */
37
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40 #include <linux/dma-mapping.h>
41 #include <linux/slab.h>
42 #include <linux/module.h>
43 #include <linux/security.h>
44 #include <rdma/ib_cache.h>
45
46 #include "mad_priv.h"
47 #include "core_priv.h"
48 #include "mad_rmpp.h"
49 #include "smi.h"
50 #include "opa_smi.h"
51 #include "agent.h"
52
53 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
54 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
55
56 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
57 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
58 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
59 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
60
61 static struct list_head ib_mad_port_list;
62 static u32 ib_mad_client_id = 0;
63
64 /* Port list lock */
65 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
66
67 /* Forward declarations */
68 static int method_in_use(struct ib_mad_mgmt_method_table **method,
69 struct ib_mad_reg_req *mad_reg_req);
70 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
71 static struct ib_mad_agent_private *find_mad_agent(
72 struct ib_mad_port_private *port_priv,
73 const struct ib_mad_hdr *mad);
74 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
75 struct ib_mad_private *mad);
76 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
77 static void timeout_sends(struct work_struct *work);
78 static void local_completions(struct work_struct *work);
79 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
80 struct ib_mad_agent_private *agent_priv,
81 u8 mgmt_class);
82 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv);
84 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
85 struct ib_wc *wc);
86 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
87
88 /*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92 static inline struct ib_mad_port_private *
93 __ib_get_mad_port(struct ib_device *device, int port_num)
94 {
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102 }
103
104 /*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108 static inline struct ib_mad_port_private *
109 ib_get_mad_port(struct ib_device *device, int port_num)
110 {
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119 }
120
121 static inline u8 convert_mgmt_class(u8 mgmt_class)
122 {
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126 }
127
128 static int get_spl_qp_index(enum ib_qp_type qp_type)
129 {
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139 }
140
141 static int vendor_class_index(u8 mgmt_class)
142 {
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144 }
145
146 static int is_vendor_class(u8 mgmt_class)
147 {
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152 }
153
154 static int is_vendor_oui(char *oui)
155 {
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159 }
160
161 static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164 {
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180 }
181
182 int ib_response_mad(const struct ib_mad_hdr *hdr)
183 {
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188 }
189 EXPORT_SYMBOL(ib_response_mad);
190
191 /*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203 {
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev,
321 "ib_register_mad_agent: Invalid port %d\n",
322 port_num);
323 ret = ERR_PTR(-ENODEV);
324 goto error1;
325 }
326
327 /* Verify the QP requested is supported. For example, Ethernet devices
328 * will not have QP0 */
329 if (!port_priv->qp_info[qpn].qp) {
330 dev_notice(&device->dev,
331 "ib_register_mad_agent: QP %d not supported\n", qpn);
332 ret = ERR_PTR(-EPROTONOSUPPORT);
333 goto error1;
334 }
335
336 /* Allocate structures */
337 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
338 if (!mad_agent_priv) {
339 ret = ERR_PTR(-ENOMEM);
340 goto error1;
341 }
342
343 if (mad_reg_req) {
344 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
345 if (!reg_req) {
346 ret = ERR_PTR(-ENOMEM);
347 goto error3;
348 }
349 }
350
351 /* Now, fill in the various structures */
352 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
353 mad_agent_priv->reg_req = reg_req;
354 mad_agent_priv->agent.rmpp_version = rmpp_version;
355 mad_agent_priv->agent.device = device;
356 mad_agent_priv->agent.recv_handler = recv_handler;
357 mad_agent_priv->agent.send_handler = send_handler;
358 mad_agent_priv->agent.context = context;
359 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
360 mad_agent_priv->agent.port_num = port_num;
361 mad_agent_priv->agent.flags = registration_flags;
362 spin_lock_init(&mad_agent_priv->lock);
363 INIT_LIST_HEAD(&mad_agent_priv->send_list);
364 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
365 INIT_LIST_HEAD(&mad_agent_priv->done_list);
366 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
367 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
368 INIT_LIST_HEAD(&mad_agent_priv->local_list);
369 INIT_WORK(&mad_agent_priv->local_work, local_completions);
370 atomic_set(&mad_agent_priv->refcount, 1);
371 init_completion(&mad_agent_priv->comp);
372
373 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
374 if (ret2) {
375 ret = ERR_PTR(ret2);
376 goto error4;
377 }
378
379 spin_lock_irqsave(&port_priv->reg_lock, flags);
380 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
381
382 /*
383 * Make sure MAD registration (if supplied)
384 * is non overlapping with any existing ones
385 */
386 if (mad_reg_req) {
387 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
388 if (!is_vendor_class(mgmt_class)) {
389 class = port_priv->version[mad_reg_req->
390 mgmt_class_version].class;
391 if (class) {
392 method = class->method_table[mgmt_class];
393 if (method) {
394 if (method_in_use(&method,
395 mad_reg_req))
396 goto error5;
397 }
398 }
399 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
400 mgmt_class);
401 } else {
402 /* "New" vendor class range */
403 vendor = port_priv->version[mad_reg_req->
404 mgmt_class_version].vendor;
405 if (vendor) {
406 vclass = vendor_class_index(mgmt_class);
407 vendor_class = vendor->vendor_class[vclass];
408 if (vendor_class) {
409 if (is_vendor_method_in_use(
410 vendor_class,
411 mad_reg_req))
412 goto error5;
413 }
414 }
415 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
416 }
417 if (ret2) {
418 ret = ERR_PTR(ret2);
419 goto error5;
420 }
421 }
422
423 /* Add mad agent into port's agent list */
424 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
425 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
426
427 return &mad_agent_priv->agent;
428 error5:
429 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
430 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
431 error4:
432 kfree(reg_req);
433 error3:
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 int err;
503
504 /* Validate parameters */
505 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
506 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
507 ret = ERR_PTR(-EINVAL);
508 goto error1;
509 }
510 qpn = get_spl_qp_index(qp_type);
511 if (qpn == -1) {
512 ret = ERR_PTR(-EINVAL);
513 goto error1;
514 }
515 port_priv = ib_get_mad_port(device, port_num);
516 if (!port_priv) {
517 ret = ERR_PTR(-ENODEV);
518 goto error1;
519 }
520 /* Allocate structures */
521 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
522 if (!mad_snoop_priv) {
523 ret = ERR_PTR(-ENOMEM);
524 goto error1;
525 }
526
527 /* Now, fill in the various structures */
528 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
529 mad_snoop_priv->agent.device = device;
530 mad_snoop_priv->agent.recv_handler = recv_handler;
531 mad_snoop_priv->agent.snoop_handler = snoop_handler;
532 mad_snoop_priv->agent.context = context;
533 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
534 mad_snoop_priv->agent.port_num = port_num;
535 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
536 init_completion(&mad_snoop_priv->comp);
537
538 err = ib_mad_agent_security_setup(&mad_snoop_priv->agent, qp_type);
539 if (err) {
540 ret = ERR_PTR(err);
541 goto error2;
542 }
543
544 mad_snoop_priv->snoop_index = register_snoop_agent(
545 &port_priv->qp_info[qpn],
546 mad_snoop_priv);
547 if (mad_snoop_priv->snoop_index < 0) {
548 ret = ERR_PTR(mad_snoop_priv->snoop_index);
549 goto error3;
550 }
551
552 atomic_set(&mad_snoop_priv->refcount, 1);
553 return &mad_snoop_priv->agent;
554 error3:
555 ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
556 error2:
557 kfree(mad_snoop_priv);
558 error1:
559 return ret;
560 }
561 EXPORT_SYMBOL(ib_register_mad_snoop);
562
563 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
564 {
565 if (atomic_dec_and_test(&mad_agent_priv->refcount))
566 complete(&mad_agent_priv->comp);
567 }
568
569 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
570 {
571 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
572 complete(&mad_snoop_priv->comp);
573 }
574
575 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
576 {
577 struct ib_mad_port_private *port_priv;
578 unsigned long flags;
579
580 /* Note that we could still be handling received MADs */
581
582 /*
583 * Canceling all sends results in dropping received response
584 * MADs, preventing us from queuing additional work
585 */
586 cancel_mads(mad_agent_priv);
587 port_priv = mad_agent_priv->qp_info->port_priv;
588 cancel_delayed_work(&mad_agent_priv->timed_work);
589
590 spin_lock_irqsave(&port_priv->reg_lock, flags);
591 remove_mad_reg_req(mad_agent_priv);
592 list_del(&mad_agent_priv->agent_list);
593 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
594
595 flush_workqueue(port_priv->wq);
596 ib_cancel_rmpp_recvs(mad_agent_priv);
597
598 deref_mad_agent(mad_agent_priv);
599 wait_for_completion(&mad_agent_priv->comp);
600
601 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
602
603 kfree(mad_agent_priv->reg_req);
604 kfree(mad_agent_priv);
605 }
606
607 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
608 {
609 struct ib_mad_qp_info *qp_info;
610 unsigned long flags;
611
612 qp_info = mad_snoop_priv->qp_info;
613 spin_lock_irqsave(&qp_info->snoop_lock, flags);
614 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
615 atomic_dec(&qp_info->snoop_count);
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617
618 deref_snoop_agent(mad_snoop_priv);
619 wait_for_completion(&mad_snoop_priv->comp);
620
621 ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
622
623 kfree(mad_snoop_priv);
624 }
625
626 /*
627 * ib_unregister_mad_agent - Unregisters a client from using MAD services
628 */
629 void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
630 {
631 struct ib_mad_agent_private *mad_agent_priv;
632 struct ib_mad_snoop_private *mad_snoop_priv;
633
634 /* If the TID is zero, the agent can only snoop. */
635 if (mad_agent->hi_tid) {
636 mad_agent_priv = container_of(mad_agent,
637 struct ib_mad_agent_private,
638 agent);
639 unregister_mad_agent(mad_agent_priv);
640 } else {
641 mad_snoop_priv = container_of(mad_agent,
642 struct ib_mad_snoop_private,
643 agent);
644 unregister_mad_snoop(mad_snoop_priv);
645 }
646 }
647 EXPORT_SYMBOL(ib_unregister_mad_agent);
648
649 static void dequeue_mad(struct ib_mad_list_head *mad_list)
650 {
651 struct ib_mad_queue *mad_queue;
652 unsigned long flags;
653
654 BUG_ON(!mad_list->mad_queue);
655 mad_queue = mad_list->mad_queue;
656 spin_lock_irqsave(&mad_queue->lock, flags);
657 list_del(&mad_list->list);
658 mad_queue->count--;
659 spin_unlock_irqrestore(&mad_queue->lock, flags);
660 }
661
662 static void snoop_send(struct ib_mad_qp_info *qp_info,
663 struct ib_mad_send_buf *send_buf,
664 struct ib_mad_send_wc *mad_send_wc,
665 int mad_snoop_flags)
666 {
667 struct ib_mad_snoop_private *mad_snoop_priv;
668 unsigned long flags;
669 int i;
670
671 spin_lock_irqsave(&qp_info->snoop_lock, flags);
672 for (i = 0; i < qp_info->snoop_table_size; i++) {
673 mad_snoop_priv = qp_info->snoop_table[i];
674 if (!mad_snoop_priv ||
675 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
676 continue;
677
678 atomic_inc(&mad_snoop_priv->refcount);
679 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
680 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
681 send_buf, mad_send_wc);
682 deref_snoop_agent(mad_snoop_priv);
683 spin_lock_irqsave(&qp_info->snoop_lock, flags);
684 }
685 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
686 }
687
688 static void snoop_recv(struct ib_mad_qp_info *qp_info,
689 struct ib_mad_recv_wc *mad_recv_wc,
690 int mad_snoop_flags)
691 {
692 struct ib_mad_snoop_private *mad_snoop_priv;
693 unsigned long flags;
694 int i;
695
696 spin_lock_irqsave(&qp_info->snoop_lock, flags);
697 for (i = 0; i < qp_info->snoop_table_size; i++) {
698 mad_snoop_priv = qp_info->snoop_table[i];
699 if (!mad_snoop_priv ||
700 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
701 continue;
702
703 atomic_inc(&mad_snoop_priv->refcount);
704 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
705 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
706 mad_recv_wc);
707 deref_snoop_agent(mad_snoop_priv);
708 spin_lock_irqsave(&qp_info->snoop_lock, flags);
709 }
710 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
711 }
712
713 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
714 u16 pkey_index, u8 port_num, struct ib_wc *wc)
715 {
716 memset(wc, 0, sizeof *wc);
717 wc->wr_cqe = cqe;
718 wc->status = IB_WC_SUCCESS;
719 wc->opcode = IB_WC_RECV;
720 wc->pkey_index = pkey_index;
721 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
722 wc->src_qp = IB_QP0;
723 wc->qp = qp;
724 wc->slid = slid;
725 wc->sl = 0;
726 wc->dlid_path_bits = 0;
727 wc->port_num = port_num;
728 }
729
730 static size_t mad_priv_size(const struct ib_mad_private *mp)
731 {
732 return sizeof(struct ib_mad_private) + mp->mad_size;
733 }
734
735 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
736 {
737 size_t size = sizeof(struct ib_mad_private) + mad_size;
738 struct ib_mad_private *ret = kzalloc(size, flags);
739
740 if (ret)
741 ret->mad_size = mad_size;
742
743 return ret;
744 }
745
746 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
747 {
748 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
749 }
750
751 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
752 {
753 return sizeof(struct ib_grh) + mp->mad_size;
754 }
755
756 /*
757 * Return 0 if SMP is to be sent
758 * Return 1 if SMP was consumed locally (whether or not solicited)
759 * Return < 0 if error
760 */
761 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
762 struct ib_mad_send_wr_private *mad_send_wr)
763 {
764 int ret = 0;
765 struct ib_smp *smp = mad_send_wr->send_buf.mad;
766 struct opa_smp *opa_smp = (struct opa_smp *)smp;
767 unsigned long flags;
768 struct ib_mad_local_private *local;
769 struct ib_mad_private *mad_priv;
770 struct ib_mad_port_private *port_priv;
771 struct ib_mad_agent_private *recv_mad_agent = NULL;
772 struct ib_device *device = mad_agent_priv->agent.device;
773 u8 port_num;
774 struct ib_wc mad_wc;
775 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
776 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
777 u16 out_mad_pkey_index = 0;
778 u16 drslid;
779 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
780 mad_agent_priv->qp_info->port_priv->port_num);
781
782 if (rdma_cap_ib_switch(device) &&
783 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
784 port_num = send_wr->port_num;
785 else
786 port_num = mad_agent_priv->agent.port_num;
787
788 /*
789 * Directed route handling starts if the initial LID routed part of
790 * a request or the ending LID routed part of a response is empty.
791 * If we are at the start of the LID routed part, don't update the
792 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
793 */
794 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
795 u32 opa_drslid;
796
797 if ((opa_get_smp_direction(opa_smp)
798 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
799 OPA_LID_PERMISSIVE &&
800 opa_smi_handle_dr_smp_send(opa_smp,
801 rdma_cap_ib_switch(device),
802 port_num) == IB_SMI_DISCARD) {
803 ret = -EINVAL;
804 dev_err(&device->dev, "OPA Invalid directed route\n");
805 goto out;
806 }
807 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
808 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
809 opa_drslid & 0xffff0000) {
810 ret = -EINVAL;
811 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
812 opa_drslid);
813 goto out;
814 }
815 drslid = (u16)(opa_drslid & 0x0000ffff);
816
817 /* Check to post send on QP or process locally */
818 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
819 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
820 goto out;
821 } else {
822 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
823 IB_LID_PERMISSIVE &&
824 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
825 IB_SMI_DISCARD) {
826 ret = -EINVAL;
827 dev_err(&device->dev, "Invalid directed route\n");
828 goto out;
829 }
830 drslid = be16_to_cpu(smp->dr_slid);
831
832 /* Check to post send on QP or process locally */
833 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
834 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
835 goto out;
836 }
837
838 local = kmalloc(sizeof *local, GFP_ATOMIC);
839 if (!local) {
840 ret = -ENOMEM;
841 goto out;
842 }
843 local->mad_priv = NULL;
844 local->recv_mad_agent = NULL;
845 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
846 if (!mad_priv) {
847 ret = -ENOMEM;
848 kfree(local);
849 goto out;
850 }
851
852 build_smp_wc(mad_agent_priv->agent.qp,
853 send_wr->wr.wr_cqe, drslid,
854 send_wr->pkey_index,
855 send_wr->port_num, &mad_wc);
856
857 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
858 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
859 + mad_send_wr->send_buf.data_len
860 + sizeof(struct ib_grh);
861 }
862
863 /* No GRH for DR SMP */
864 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
865 (const struct ib_mad_hdr *)smp, mad_size,
866 (struct ib_mad_hdr *)mad_priv->mad,
867 &mad_size, &out_mad_pkey_index);
868 switch (ret)
869 {
870 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
871 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
872 mad_agent_priv->agent.recv_handler) {
873 local->mad_priv = mad_priv;
874 local->recv_mad_agent = mad_agent_priv;
875 /*
876 * Reference MAD agent until receive
877 * side of local completion handled
878 */
879 atomic_inc(&mad_agent_priv->refcount);
880 } else
881 kfree(mad_priv);
882 break;
883 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
884 kfree(mad_priv);
885 break;
886 case IB_MAD_RESULT_SUCCESS:
887 /* Treat like an incoming receive MAD */
888 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
889 mad_agent_priv->agent.port_num);
890 if (port_priv) {
891 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
892 recv_mad_agent = find_mad_agent(port_priv,
893 (const struct ib_mad_hdr *)mad_priv->mad);
894 }
895 if (!port_priv || !recv_mad_agent) {
896 /*
897 * No receiving agent so drop packet and
898 * generate send completion.
899 */
900 kfree(mad_priv);
901 break;
902 }
903 local->mad_priv = mad_priv;
904 local->recv_mad_agent = recv_mad_agent;
905 break;
906 default:
907 kfree(mad_priv);
908 kfree(local);
909 ret = -EINVAL;
910 goto out;
911 }
912
913 local->mad_send_wr = mad_send_wr;
914 if (opa) {
915 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
916 local->return_wc_byte_len = mad_size;
917 }
918 /* Reference MAD agent until send side of local completion handled */
919 atomic_inc(&mad_agent_priv->refcount);
920 /* Queue local completion to local list */
921 spin_lock_irqsave(&mad_agent_priv->lock, flags);
922 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
923 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
924 queue_work(mad_agent_priv->qp_info->port_priv->wq,
925 &mad_agent_priv->local_work);
926 ret = 1;
927 out:
928 return ret;
929 }
930
931 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
932 {
933 int seg_size, pad;
934
935 seg_size = mad_size - hdr_len;
936 if (data_len && seg_size) {
937 pad = seg_size - data_len % seg_size;
938 return pad == seg_size ? 0 : pad;
939 } else
940 return seg_size;
941 }
942
943 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
944 {
945 struct ib_rmpp_segment *s, *t;
946
947 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
948 list_del(&s->list);
949 kfree(s);
950 }
951 }
952
953 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
954 size_t mad_size, gfp_t gfp_mask)
955 {
956 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
957 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
958 struct ib_rmpp_segment *seg = NULL;
959 int left, seg_size, pad;
960
961 send_buf->seg_size = mad_size - send_buf->hdr_len;
962 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
963 seg_size = send_buf->seg_size;
964 pad = send_wr->pad;
965
966 /* Allocate data segments. */
967 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
968 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
969 if (!seg) {
970 free_send_rmpp_list(send_wr);
971 return -ENOMEM;
972 }
973 seg->num = ++send_buf->seg_count;
974 list_add_tail(&seg->list, &send_wr->rmpp_list);
975 }
976
977 /* Zero any padding */
978 if (pad)
979 memset(seg->data + seg_size - pad, 0, pad);
980
981 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
982 agent.rmpp_version;
983 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
984 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
985
986 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
987 struct ib_rmpp_segment, list);
988 send_wr->last_ack_seg = send_wr->cur_seg;
989 return 0;
990 }
991
992 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
993 {
994 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
995 }
996 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
997
998 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
999 u32 remote_qpn, u16 pkey_index,
1000 int rmpp_active,
1001 int hdr_len, int data_len,
1002 gfp_t gfp_mask,
1003 u8 base_version)
1004 {
1005 struct ib_mad_agent_private *mad_agent_priv;
1006 struct ib_mad_send_wr_private *mad_send_wr;
1007 int pad, message_size, ret, size;
1008 void *buf;
1009 size_t mad_size;
1010 bool opa;
1011
1012 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1013 agent);
1014
1015 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1016
1017 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1018 mad_size = sizeof(struct opa_mad);
1019 else
1020 mad_size = sizeof(struct ib_mad);
1021
1022 pad = get_pad_size(hdr_len, data_len, mad_size);
1023 message_size = hdr_len + data_len + pad;
1024
1025 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1026 if (!rmpp_active && message_size > mad_size)
1027 return ERR_PTR(-EINVAL);
1028 } else
1029 if (rmpp_active || message_size > mad_size)
1030 return ERR_PTR(-EINVAL);
1031
1032 size = rmpp_active ? hdr_len : mad_size;
1033 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1034 if (!buf)
1035 return ERR_PTR(-ENOMEM);
1036
1037 mad_send_wr = buf + size;
1038 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1039 mad_send_wr->send_buf.mad = buf;
1040 mad_send_wr->send_buf.hdr_len = hdr_len;
1041 mad_send_wr->send_buf.data_len = data_len;
1042 mad_send_wr->pad = pad;
1043
1044 mad_send_wr->mad_agent_priv = mad_agent_priv;
1045 mad_send_wr->sg_list[0].length = hdr_len;
1046 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1047
1048 /* OPA MADs don't have to be the full 2048 bytes */
1049 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1050 data_len < mad_size - hdr_len)
1051 mad_send_wr->sg_list[1].length = data_len;
1052 else
1053 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1054
1055 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1056
1057 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1058
1059 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1060 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1061 mad_send_wr->send_wr.wr.num_sge = 2;
1062 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1063 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1064 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1065 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1066 mad_send_wr->send_wr.pkey_index = pkey_index;
1067
1068 if (rmpp_active) {
1069 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1070 if (ret) {
1071 kfree(buf);
1072 return ERR_PTR(ret);
1073 }
1074 }
1075
1076 mad_send_wr->send_buf.mad_agent = mad_agent;
1077 atomic_inc(&mad_agent_priv->refcount);
1078 return &mad_send_wr->send_buf;
1079 }
1080 EXPORT_SYMBOL(ib_create_send_mad);
1081
1082 int ib_get_mad_data_offset(u8 mgmt_class)
1083 {
1084 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1085 return IB_MGMT_SA_HDR;
1086 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1087 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1088 (mgmt_class == IB_MGMT_CLASS_BIS))
1089 return IB_MGMT_DEVICE_HDR;
1090 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1091 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1092 return IB_MGMT_VENDOR_HDR;
1093 else
1094 return IB_MGMT_MAD_HDR;
1095 }
1096 EXPORT_SYMBOL(ib_get_mad_data_offset);
1097
1098 int ib_is_mad_class_rmpp(u8 mgmt_class)
1099 {
1100 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1101 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1102 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1103 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1104 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1105 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1106 return 1;
1107 return 0;
1108 }
1109 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1110
1111 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1112 {
1113 struct ib_mad_send_wr_private *mad_send_wr;
1114 struct list_head *list;
1115
1116 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1117 send_buf);
1118 list = &mad_send_wr->cur_seg->list;
1119
1120 if (mad_send_wr->cur_seg->num < seg_num) {
1121 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1122 if (mad_send_wr->cur_seg->num == seg_num)
1123 break;
1124 } else if (mad_send_wr->cur_seg->num > seg_num) {
1125 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1126 if (mad_send_wr->cur_seg->num == seg_num)
1127 break;
1128 }
1129 return mad_send_wr->cur_seg->data;
1130 }
1131 EXPORT_SYMBOL(ib_get_rmpp_segment);
1132
1133 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1134 {
1135 if (mad_send_wr->send_buf.seg_count)
1136 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1137 mad_send_wr->seg_num);
1138 else
1139 return mad_send_wr->send_buf.mad +
1140 mad_send_wr->send_buf.hdr_len;
1141 }
1142
1143 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1144 {
1145 struct ib_mad_agent_private *mad_agent_priv;
1146 struct ib_mad_send_wr_private *mad_send_wr;
1147
1148 mad_agent_priv = container_of(send_buf->mad_agent,
1149 struct ib_mad_agent_private, agent);
1150 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1151 send_buf);
1152
1153 free_send_rmpp_list(mad_send_wr);
1154 kfree(send_buf->mad);
1155 deref_mad_agent(mad_agent_priv);
1156 }
1157 EXPORT_SYMBOL(ib_free_send_mad);
1158
1159 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1160 {
1161 struct ib_mad_qp_info *qp_info;
1162 struct list_head *list;
1163 struct ib_send_wr *bad_send_wr;
1164 struct ib_mad_agent *mad_agent;
1165 struct ib_sge *sge;
1166 unsigned long flags;
1167 int ret;
1168
1169 /* Set WR ID to find mad_send_wr upon completion */
1170 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1171 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1172 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1173 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1174
1175 mad_agent = mad_send_wr->send_buf.mad_agent;
1176 sge = mad_send_wr->sg_list;
1177 sge[0].addr = ib_dma_map_single(mad_agent->device,
1178 mad_send_wr->send_buf.mad,
1179 sge[0].length,
1180 DMA_TO_DEVICE);
1181 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1182 return -ENOMEM;
1183
1184 mad_send_wr->header_mapping = sge[0].addr;
1185
1186 sge[1].addr = ib_dma_map_single(mad_agent->device,
1187 ib_get_payload(mad_send_wr),
1188 sge[1].length,
1189 DMA_TO_DEVICE);
1190 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1191 ib_dma_unmap_single(mad_agent->device,
1192 mad_send_wr->header_mapping,
1193 sge[0].length, DMA_TO_DEVICE);
1194 return -ENOMEM;
1195 }
1196 mad_send_wr->payload_mapping = sge[1].addr;
1197
1198 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1199 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1200 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1201 &bad_send_wr);
1202 list = &qp_info->send_queue.list;
1203 } else {
1204 ret = 0;
1205 list = &qp_info->overflow_list;
1206 }
1207
1208 if (!ret) {
1209 qp_info->send_queue.count++;
1210 list_add_tail(&mad_send_wr->mad_list.list, list);
1211 }
1212 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1213 if (ret) {
1214 ib_dma_unmap_single(mad_agent->device,
1215 mad_send_wr->header_mapping,
1216 sge[0].length, DMA_TO_DEVICE);
1217 ib_dma_unmap_single(mad_agent->device,
1218 mad_send_wr->payload_mapping,
1219 sge[1].length, DMA_TO_DEVICE);
1220 }
1221 return ret;
1222 }
1223
1224 /*
1225 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1226 * with the registered client
1227 */
1228 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1229 struct ib_mad_send_buf **bad_send_buf)
1230 {
1231 struct ib_mad_agent_private *mad_agent_priv;
1232 struct ib_mad_send_buf *next_send_buf;
1233 struct ib_mad_send_wr_private *mad_send_wr;
1234 unsigned long flags;
1235 int ret = -EINVAL;
1236
1237 /* Walk list of send WRs and post each on send list */
1238 for (; send_buf; send_buf = next_send_buf) {
1239 mad_send_wr = container_of(send_buf,
1240 struct ib_mad_send_wr_private,
1241 send_buf);
1242 mad_agent_priv = mad_send_wr->mad_agent_priv;
1243
1244 ret = ib_mad_enforce_security(mad_agent_priv,
1245 mad_send_wr->send_wr.pkey_index);
1246 if (ret)
1247 goto error;
1248
1249 if (!send_buf->mad_agent->send_handler ||
1250 (send_buf->timeout_ms &&
1251 !send_buf->mad_agent->recv_handler)) {
1252 ret = -EINVAL;
1253 goto error;
1254 }
1255
1256 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1257 if (mad_agent_priv->agent.rmpp_version) {
1258 ret = -EINVAL;
1259 goto error;
1260 }
1261 }
1262
1263 /*
1264 * Save pointer to next work request to post in case the
1265 * current one completes, and the user modifies the work
1266 * request associated with the completion
1267 */
1268 next_send_buf = send_buf->next;
1269 mad_send_wr->send_wr.ah = send_buf->ah;
1270
1271 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1272 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1273 ret = handle_outgoing_dr_smp(mad_agent_priv,
1274 mad_send_wr);
1275 if (ret < 0) /* error */
1276 goto error;
1277 else if (ret == 1) /* locally consumed */
1278 continue;
1279 }
1280
1281 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1282 /* Timeout will be updated after send completes */
1283 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1284 mad_send_wr->max_retries = send_buf->retries;
1285 mad_send_wr->retries_left = send_buf->retries;
1286 send_buf->retries = 0;
1287 /* Reference for work request to QP + response */
1288 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1289 mad_send_wr->status = IB_WC_SUCCESS;
1290
1291 /* Reference MAD agent until send completes */
1292 atomic_inc(&mad_agent_priv->refcount);
1293 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1294 list_add_tail(&mad_send_wr->agent_list,
1295 &mad_agent_priv->send_list);
1296 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1297
1298 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1299 ret = ib_send_rmpp_mad(mad_send_wr);
1300 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1301 ret = ib_send_mad(mad_send_wr);
1302 } else
1303 ret = ib_send_mad(mad_send_wr);
1304 if (ret < 0) {
1305 /* Fail send request */
1306 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1307 list_del(&mad_send_wr->agent_list);
1308 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1309 atomic_dec(&mad_agent_priv->refcount);
1310 goto error;
1311 }
1312 }
1313 return 0;
1314 error:
1315 if (bad_send_buf)
1316 *bad_send_buf = send_buf;
1317 return ret;
1318 }
1319 EXPORT_SYMBOL(ib_post_send_mad);
1320
1321 /*
1322 * ib_free_recv_mad - Returns data buffers used to receive
1323 * a MAD to the access layer
1324 */
1325 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1326 {
1327 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1328 struct ib_mad_private_header *mad_priv_hdr;
1329 struct ib_mad_private *priv;
1330 struct list_head free_list;
1331
1332 INIT_LIST_HEAD(&free_list);
1333 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1334
1335 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1336 &free_list, list) {
1337 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1338 recv_buf);
1339 mad_priv_hdr = container_of(mad_recv_wc,
1340 struct ib_mad_private_header,
1341 recv_wc);
1342 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1343 header);
1344 kfree(priv);
1345 }
1346 }
1347 EXPORT_SYMBOL(ib_free_recv_mad);
1348
1349 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1350 u8 rmpp_version,
1351 ib_mad_send_handler send_handler,
1352 ib_mad_recv_handler recv_handler,
1353 void *context)
1354 {
1355 return ERR_PTR(-EINVAL); /* XXX: for now */
1356 }
1357 EXPORT_SYMBOL(ib_redirect_mad_qp);
1358
1359 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1360 struct ib_wc *wc)
1361 {
1362 dev_err(&mad_agent->device->dev,
1363 "ib_process_mad_wc() not implemented yet\n");
1364 return 0;
1365 }
1366 EXPORT_SYMBOL(ib_process_mad_wc);
1367
1368 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1369 struct ib_mad_reg_req *mad_reg_req)
1370 {
1371 int i;
1372
1373 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1374 if ((*method)->agent[i]) {
1375 pr_err("Method %d already in use\n", i);
1376 return -EINVAL;
1377 }
1378 }
1379 return 0;
1380 }
1381
1382 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1383 {
1384 /* Allocate management method table */
1385 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1386 return (*method) ? 0 : (-ENOMEM);
1387 }
1388
1389 /*
1390 * Check to see if there are any methods still in use
1391 */
1392 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1393 {
1394 int i;
1395
1396 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1397 if (method->agent[i])
1398 return 1;
1399 return 0;
1400 }
1401
1402 /*
1403 * Check to see if there are any method tables for this class still in use
1404 */
1405 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1406 {
1407 int i;
1408
1409 for (i = 0; i < MAX_MGMT_CLASS; i++)
1410 if (class->method_table[i])
1411 return 1;
1412 return 0;
1413 }
1414
1415 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1416 {
1417 int i;
1418
1419 for (i = 0; i < MAX_MGMT_OUI; i++)
1420 if (vendor_class->method_table[i])
1421 return 1;
1422 return 0;
1423 }
1424
1425 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1426 const char *oui)
1427 {
1428 int i;
1429
1430 for (i = 0; i < MAX_MGMT_OUI; i++)
1431 /* Is there matching OUI for this vendor class ? */
1432 if (!memcmp(vendor_class->oui[i], oui, 3))
1433 return i;
1434
1435 return -1;
1436 }
1437
1438 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1439 {
1440 int i;
1441
1442 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1443 if (vendor->vendor_class[i])
1444 return 1;
1445
1446 return 0;
1447 }
1448
1449 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1450 struct ib_mad_agent_private *agent)
1451 {
1452 int i;
1453
1454 /* Remove any methods for this mad agent */
1455 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1456 if (method->agent[i] == agent) {
1457 method->agent[i] = NULL;
1458 }
1459 }
1460 }
1461
1462 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1463 struct ib_mad_agent_private *agent_priv,
1464 u8 mgmt_class)
1465 {
1466 struct ib_mad_port_private *port_priv;
1467 struct ib_mad_mgmt_class_table **class;
1468 struct ib_mad_mgmt_method_table **method;
1469 int i, ret;
1470
1471 port_priv = agent_priv->qp_info->port_priv;
1472 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1473 if (!*class) {
1474 /* Allocate management class table for "new" class version */
1475 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1476 if (!*class) {
1477 ret = -ENOMEM;
1478 goto error1;
1479 }
1480
1481 /* Allocate method table for this management class */
1482 method = &(*class)->method_table[mgmt_class];
1483 if ((ret = allocate_method_table(method)))
1484 goto error2;
1485 } else {
1486 method = &(*class)->method_table[mgmt_class];
1487 if (!*method) {
1488 /* Allocate method table for this management class */
1489 if ((ret = allocate_method_table(method)))
1490 goto error1;
1491 }
1492 }
1493
1494 /* Now, make sure methods are not already in use */
1495 if (method_in_use(method, mad_reg_req))
1496 goto error3;
1497
1498 /* Finally, add in methods being registered */
1499 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1500 (*method)->agent[i] = agent_priv;
1501
1502 return 0;
1503
1504 error3:
1505 /* Remove any methods for this mad agent */
1506 remove_methods_mad_agent(*method, agent_priv);
1507 /* Now, check to see if there are any methods in use */
1508 if (!check_method_table(*method)) {
1509 /* If not, release management method table */
1510 kfree(*method);
1511 *method = NULL;
1512 }
1513 ret = -EINVAL;
1514 goto error1;
1515 error2:
1516 kfree(*class);
1517 *class = NULL;
1518 error1:
1519 return ret;
1520 }
1521
1522 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1523 struct ib_mad_agent_private *agent_priv)
1524 {
1525 struct ib_mad_port_private *port_priv;
1526 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1527 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1528 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1529 struct ib_mad_mgmt_method_table **method;
1530 int i, ret = -ENOMEM;
1531 u8 vclass;
1532
1533 /* "New" vendor (with OUI) class */
1534 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1535 port_priv = agent_priv->qp_info->port_priv;
1536 vendor_table = &port_priv->version[
1537 mad_reg_req->mgmt_class_version].vendor;
1538 if (!*vendor_table) {
1539 /* Allocate mgmt vendor class table for "new" class version */
1540 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1541 if (!vendor)
1542 goto error1;
1543
1544 *vendor_table = vendor;
1545 }
1546 if (!(*vendor_table)->vendor_class[vclass]) {
1547 /* Allocate table for this management vendor class */
1548 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1549 if (!vendor_class)
1550 goto error2;
1551
1552 (*vendor_table)->vendor_class[vclass] = vendor_class;
1553 }
1554 for (i = 0; i < MAX_MGMT_OUI; i++) {
1555 /* Is there matching OUI for this vendor class ? */
1556 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1557 mad_reg_req->oui, 3)) {
1558 method = &(*vendor_table)->vendor_class[
1559 vclass]->method_table[i];
1560 BUG_ON(!*method);
1561 goto check_in_use;
1562 }
1563 }
1564 for (i = 0; i < MAX_MGMT_OUI; i++) {
1565 /* OUI slot available ? */
1566 if (!is_vendor_oui((*vendor_table)->vendor_class[
1567 vclass]->oui[i])) {
1568 method = &(*vendor_table)->vendor_class[
1569 vclass]->method_table[i];
1570 BUG_ON(*method);
1571 /* Allocate method table for this OUI */
1572 if ((ret = allocate_method_table(method)))
1573 goto error3;
1574 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1575 mad_reg_req->oui, 3);
1576 goto check_in_use;
1577 }
1578 }
1579 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1580 goto error3;
1581
1582 check_in_use:
1583 /* Now, make sure methods are not already in use */
1584 if (method_in_use(method, mad_reg_req))
1585 goto error4;
1586
1587 /* Finally, add in methods being registered */
1588 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1589 (*method)->agent[i] = agent_priv;
1590
1591 return 0;
1592
1593 error4:
1594 /* Remove any methods for this mad agent */
1595 remove_methods_mad_agent(*method, agent_priv);
1596 /* Now, check to see if there are any methods in use */
1597 if (!check_method_table(*method)) {
1598 /* If not, release management method table */
1599 kfree(*method);
1600 *method = NULL;
1601 }
1602 ret = -EINVAL;
1603 error3:
1604 if (vendor_class) {
1605 (*vendor_table)->vendor_class[vclass] = NULL;
1606 kfree(vendor_class);
1607 }
1608 error2:
1609 if (vendor) {
1610 *vendor_table = NULL;
1611 kfree(vendor);
1612 }
1613 error1:
1614 return ret;
1615 }
1616
1617 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1618 {
1619 struct ib_mad_port_private *port_priv;
1620 struct ib_mad_mgmt_class_table *class;
1621 struct ib_mad_mgmt_method_table *method;
1622 struct ib_mad_mgmt_vendor_class_table *vendor;
1623 struct ib_mad_mgmt_vendor_class *vendor_class;
1624 int index;
1625 u8 mgmt_class;
1626
1627 /*
1628 * Was MAD registration request supplied
1629 * with original registration ?
1630 */
1631 if (!agent_priv->reg_req) {
1632 goto out;
1633 }
1634
1635 port_priv = agent_priv->qp_info->port_priv;
1636 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1637 class = port_priv->version[
1638 agent_priv->reg_req->mgmt_class_version].class;
1639 if (!class)
1640 goto vendor_check;
1641
1642 method = class->method_table[mgmt_class];
1643 if (method) {
1644 /* Remove any methods for this mad agent */
1645 remove_methods_mad_agent(method, agent_priv);
1646 /* Now, check to see if there are any methods still in use */
1647 if (!check_method_table(method)) {
1648 /* If not, release management method table */
1649 kfree(method);
1650 class->method_table[mgmt_class] = NULL;
1651 /* Any management classes left ? */
1652 if (!check_class_table(class)) {
1653 /* If not, release management class table */
1654 kfree(class);
1655 port_priv->version[
1656 agent_priv->reg_req->
1657 mgmt_class_version].class = NULL;
1658 }
1659 }
1660 }
1661
1662 vendor_check:
1663 if (!is_vendor_class(mgmt_class))
1664 goto out;
1665
1666 /* normalize mgmt_class to vendor range 2 */
1667 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1668 vendor = port_priv->version[
1669 agent_priv->reg_req->mgmt_class_version].vendor;
1670
1671 if (!vendor)
1672 goto out;
1673
1674 vendor_class = vendor->vendor_class[mgmt_class];
1675 if (vendor_class) {
1676 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1677 if (index < 0)
1678 goto out;
1679 method = vendor_class->method_table[index];
1680 if (method) {
1681 /* Remove any methods for this mad agent */
1682 remove_methods_mad_agent(method, agent_priv);
1683 /*
1684 * Now, check to see if there are
1685 * any methods still in use
1686 */
1687 if (!check_method_table(method)) {
1688 /* If not, release management method table */
1689 kfree(method);
1690 vendor_class->method_table[index] = NULL;
1691 memset(vendor_class->oui[index], 0, 3);
1692 /* Any OUIs left ? */
1693 if (!check_vendor_class(vendor_class)) {
1694 /* If not, release vendor class table */
1695 kfree(vendor_class);
1696 vendor->vendor_class[mgmt_class] = NULL;
1697 /* Any other vendor classes left ? */
1698 if (!check_vendor_table(vendor)) {
1699 kfree(vendor);
1700 port_priv->version[
1701 agent_priv->reg_req->
1702 mgmt_class_version].
1703 vendor = NULL;
1704 }
1705 }
1706 }
1707 }
1708 }
1709
1710 out:
1711 return;
1712 }
1713
1714 static struct ib_mad_agent_private *
1715 find_mad_agent(struct ib_mad_port_private *port_priv,
1716 const struct ib_mad_hdr *mad_hdr)
1717 {
1718 struct ib_mad_agent_private *mad_agent = NULL;
1719 unsigned long flags;
1720
1721 spin_lock_irqsave(&port_priv->reg_lock, flags);
1722 if (ib_response_mad(mad_hdr)) {
1723 u32 hi_tid;
1724 struct ib_mad_agent_private *entry;
1725
1726 /*
1727 * Routing is based on high 32 bits of transaction ID
1728 * of MAD.
1729 */
1730 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1731 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1732 if (entry->agent.hi_tid == hi_tid) {
1733 mad_agent = entry;
1734 break;
1735 }
1736 }
1737 } else {
1738 struct ib_mad_mgmt_class_table *class;
1739 struct ib_mad_mgmt_method_table *method;
1740 struct ib_mad_mgmt_vendor_class_table *vendor;
1741 struct ib_mad_mgmt_vendor_class *vendor_class;
1742 const struct ib_vendor_mad *vendor_mad;
1743 int index;
1744
1745 /*
1746 * Routing is based on version, class, and method
1747 * For "newer" vendor MADs, also based on OUI
1748 */
1749 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1750 goto out;
1751 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1752 class = port_priv->version[
1753 mad_hdr->class_version].class;
1754 if (!class)
1755 goto out;
1756 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1757 ARRAY_SIZE(class->method_table))
1758 goto out;
1759 method = class->method_table[convert_mgmt_class(
1760 mad_hdr->mgmt_class)];
1761 if (method)
1762 mad_agent = method->agent[mad_hdr->method &
1763 ~IB_MGMT_METHOD_RESP];
1764 } else {
1765 vendor = port_priv->version[
1766 mad_hdr->class_version].vendor;
1767 if (!vendor)
1768 goto out;
1769 vendor_class = vendor->vendor_class[vendor_class_index(
1770 mad_hdr->mgmt_class)];
1771 if (!vendor_class)
1772 goto out;
1773 /* Find matching OUI */
1774 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1775 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1776 if (index == -1)
1777 goto out;
1778 method = vendor_class->method_table[index];
1779 if (method) {
1780 mad_agent = method->agent[mad_hdr->method &
1781 ~IB_MGMT_METHOD_RESP];
1782 }
1783 }
1784 }
1785
1786 if (mad_agent) {
1787 if (mad_agent->agent.recv_handler)
1788 atomic_inc(&mad_agent->refcount);
1789 else {
1790 dev_notice(&port_priv->device->dev,
1791 "No receive handler for client %p on port %d\n",
1792 &mad_agent->agent, port_priv->port_num);
1793 mad_agent = NULL;
1794 }
1795 }
1796 out:
1797 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1798
1799 return mad_agent;
1800 }
1801
1802 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1803 const struct ib_mad_qp_info *qp_info,
1804 bool opa)
1805 {
1806 int valid = 0;
1807 u32 qp_num = qp_info->qp->qp_num;
1808
1809 /* Make sure MAD base version is understood */
1810 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1811 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1812 pr_err("MAD received with unsupported base version %d %s\n",
1813 mad_hdr->base_version, opa ? "(opa)" : "");
1814 goto out;
1815 }
1816
1817 /* Filter SMI packets sent to other than QP0 */
1818 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1819 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1820 if (qp_num == 0)
1821 valid = 1;
1822 } else {
1823 /* CM attributes other than ClassPortInfo only use Send method */
1824 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1825 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1826 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1827 goto out;
1828 /* Filter GSI packets sent to QP0 */
1829 if (qp_num != 0)
1830 valid = 1;
1831 }
1832
1833 out:
1834 return valid;
1835 }
1836
1837 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1838 const struct ib_mad_hdr *mad_hdr)
1839 {
1840 struct ib_rmpp_mad *rmpp_mad;
1841
1842 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1843 return !mad_agent_priv->agent.rmpp_version ||
1844 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1845 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1846 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1847 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1848 }
1849
1850 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1851 const struct ib_mad_recv_wc *rwc)
1852 {
1853 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1854 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1855 }
1856
1857 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1858 const struct ib_mad_send_wr_private *wr,
1859 const struct ib_mad_recv_wc *rwc )
1860 {
1861 struct rdma_ah_attr attr;
1862 u8 send_resp, rcv_resp;
1863 union ib_gid sgid;
1864 struct ib_device *device = mad_agent_priv->agent.device;
1865 u8 port_num = mad_agent_priv->agent.port_num;
1866 u8 lmc;
1867 bool has_grh;
1868
1869 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1870 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1871
1872 if (send_resp == rcv_resp)
1873 /* both requests, or both responses. GIDs different */
1874 return 0;
1875
1876 if (rdma_query_ah(wr->send_buf.ah, &attr))
1877 /* Assume not equal, to avoid false positives. */
1878 return 0;
1879
1880 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1881 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1882 /* one has GID, other does not. Assume different */
1883 return 0;
1884
1885 if (!send_resp && rcv_resp) {
1886 /* is request/response. */
1887 if (!has_grh) {
1888 if (ib_get_cached_lmc(device, port_num, &lmc))
1889 return 0;
1890 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1891 rwc->wc->dlid_path_bits) &
1892 ((1 << lmc) - 1)));
1893 } else {
1894 const struct ib_global_route *grh =
1895 rdma_ah_read_grh(&attr);
1896
1897 if (ib_get_cached_gid(device, port_num,
1898 grh->sgid_index, &sgid, NULL))
1899 return 0;
1900 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1901 16);
1902 }
1903 }
1904
1905 if (!has_grh)
1906 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1907 else
1908 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1909 rwc->recv_buf.grh->sgid.raw,
1910 16);
1911 }
1912
1913 static inline int is_direct(u8 class)
1914 {
1915 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1916 }
1917
1918 struct ib_mad_send_wr_private*
1919 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1920 const struct ib_mad_recv_wc *wc)
1921 {
1922 struct ib_mad_send_wr_private *wr;
1923 const struct ib_mad_hdr *mad_hdr;
1924
1925 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1926
1927 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1928 if ((wr->tid == mad_hdr->tid) &&
1929 rcv_has_same_class(wr, wc) &&
1930 /*
1931 * Don't check GID for direct routed MADs.
1932 * These might have permissive LIDs.
1933 */
1934 (is_direct(mad_hdr->mgmt_class) ||
1935 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1936 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1937 }
1938
1939 /*
1940 * It's possible to receive the response before we've
1941 * been notified that the send has completed
1942 */
1943 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1944 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1945 wr->tid == mad_hdr->tid &&
1946 wr->timeout &&
1947 rcv_has_same_class(wr, wc) &&
1948 /*
1949 * Don't check GID for direct routed MADs.
1950 * These might have permissive LIDs.
1951 */
1952 (is_direct(mad_hdr->mgmt_class) ||
1953 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1954 /* Verify request has not been canceled */
1955 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1956 }
1957 return NULL;
1958 }
1959
1960 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1961 {
1962 mad_send_wr->timeout = 0;
1963 if (mad_send_wr->refcount == 1)
1964 list_move_tail(&mad_send_wr->agent_list,
1965 &mad_send_wr->mad_agent_priv->done_list);
1966 }
1967
1968 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1969 struct ib_mad_recv_wc *mad_recv_wc)
1970 {
1971 struct ib_mad_send_wr_private *mad_send_wr;
1972 struct ib_mad_send_wc mad_send_wc;
1973 unsigned long flags;
1974 int ret;
1975
1976 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1977 ret = ib_mad_enforce_security(mad_agent_priv,
1978 mad_recv_wc->wc->pkey_index);
1979 if (ret) {
1980 ib_free_recv_mad(mad_recv_wc);
1981 deref_mad_agent(mad_agent_priv);
1982 return;
1983 }
1984
1985 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1986 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1987 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1988 mad_recv_wc);
1989 if (!mad_recv_wc) {
1990 deref_mad_agent(mad_agent_priv);
1991 return;
1992 }
1993 }
1994
1995 /* Complete corresponding request */
1996 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1997 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1998 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1999 if (!mad_send_wr) {
2000 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2001 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
2002 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
2003 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
2004 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
2005 /* user rmpp is in effect
2006 * and this is an active RMPP MAD
2007 */
2008 mad_agent_priv->agent.recv_handler(
2009 &mad_agent_priv->agent, NULL,
2010 mad_recv_wc);
2011 atomic_dec(&mad_agent_priv->refcount);
2012 } else {
2013 /* not user rmpp, revert to normal behavior and
2014 * drop the mad */
2015 ib_free_recv_mad(mad_recv_wc);
2016 deref_mad_agent(mad_agent_priv);
2017 return;
2018 }
2019 } else {
2020 ib_mark_mad_done(mad_send_wr);
2021 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2022
2023 /* Defined behavior is to complete response before request */
2024 mad_agent_priv->agent.recv_handler(
2025 &mad_agent_priv->agent,
2026 &mad_send_wr->send_buf,
2027 mad_recv_wc);
2028 atomic_dec(&mad_agent_priv->refcount);
2029
2030 mad_send_wc.status = IB_WC_SUCCESS;
2031 mad_send_wc.vendor_err = 0;
2032 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2033 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2034 }
2035 } else {
2036 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2037 mad_recv_wc);
2038 deref_mad_agent(mad_agent_priv);
2039 }
2040
2041 return;
2042 }
2043
2044 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2045 const struct ib_mad_qp_info *qp_info,
2046 const struct ib_wc *wc,
2047 int port_num,
2048 struct ib_mad_private *recv,
2049 struct ib_mad_private *response)
2050 {
2051 enum smi_forward_action retsmi;
2052 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2053
2054 if (smi_handle_dr_smp_recv(smp,
2055 rdma_cap_ib_switch(port_priv->device),
2056 port_num,
2057 port_priv->device->phys_port_cnt) ==
2058 IB_SMI_DISCARD)
2059 return IB_SMI_DISCARD;
2060
2061 retsmi = smi_check_forward_dr_smp(smp);
2062 if (retsmi == IB_SMI_LOCAL)
2063 return IB_SMI_HANDLE;
2064
2065 if (retsmi == IB_SMI_SEND) { /* don't forward */
2066 if (smi_handle_dr_smp_send(smp,
2067 rdma_cap_ib_switch(port_priv->device),
2068 port_num) == IB_SMI_DISCARD)
2069 return IB_SMI_DISCARD;
2070
2071 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2072 return IB_SMI_DISCARD;
2073 } else if (rdma_cap_ib_switch(port_priv->device)) {
2074 /* forward case for switches */
2075 memcpy(response, recv, mad_priv_size(response));
2076 response->header.recv_wc.wc = &response->header.wc;
2077 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2078 response->header.recv_wc.recv_buf.grh = &response->grh;
2079
2080 agent_send_response((const struct ib_mad_hdr *)response->mad,
2081 &response->grh, wc,
2082 port_priv->device,
2083 smi_get_fwd_port(smp),
2084 qp_info->qp->qp_num,
2085 response->mad_size,
2086 false);
2087
2088 return IB_SMI_DISCARD;
2089 }
2090 return IB_SMI_HANDLE;
2091 }
2092
2093 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2094 struct ib_mad_private *response,
2095 size_t *resp_len, bool opa)
2096 {
2097 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2098 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2099
2100 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2101 recv_hdr->method == IB_MGMT_METHOD_SET) {
2102 memcpy(response, recv, mad_priv_size(response));
2103 response->header.recv_wc.wc = &response->header.wc;
2104 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2105 response->header.recv_wc.recv_buf.grh = &response->grh;
2106 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2107 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2108 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2109 resp_hdr->status |= IB_SMP_DIRECTION;
2110
2111 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2112 if (recv_hdr->mgmt_class ==
2113 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2114 recv_hdr->mgmt_class ==
2115 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2116 *resp_len = opa_get_smp_header_size(
2117 (struct opa_smp *)recv->mad);
2118 else
2119 *resp_len = sizeof(struct ib_mad_hdr);
2120 }
2121
2122 return true;
2123 } else {
2124 return false;
2125 }
2126 }
2127
2128 static enum smi_action
2129 handle_opa_smi(struct ib_mad_port_private *port_priv,
2130 struct ib_mad_qp_info *qp_info,
2131 struct ib_wc *wc,
2132 int port_num,
2133 struct ib_mad_private *recv,
2134 struct ib_mad_private *response)
2135 {
2136 enum smi_forward_action retsmi;
2137 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2138
2139 if (opa_smi_handle_dr_smp_recv(smp,
2140 rdma_cap_ib_switch(port_priv->device),
2141 port_num,
2142 port_priv->device->phys_port_cnt) ==
2143 IB_SMI_DISCARD)
2144 return IB_SMI_DISCARD;
2145
2146 retsmi = opa_smi_check_forward_dr_smp(smp);
2147 if (retsmi == IB_SMI_LOCAL)
2148 return IB_SMI_HANDLE;
2149
2150 if (retsmi == IB_SMI_SEND) { /* don't forward */
2151 if (opa_smi_handle_dr_smp_send(smp,
2152 rdma_cap_ib_switch(port_priv->device),
2153 port_num) == IB_SMI_DISCARD)
2154 return IB_SMI_DISCARD;
2155
2156 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2157 IB_SMI_DISCARD)
2158 return IB_SMI_DISCARD;
2159
2160 } else if (rdma_cap_ib_switch(port_priv->device)) {
2161 /* forward case for switches */
2162 memcpy(response, recv, mad_priv_size(response));
2163 response->header.recv_wc.wc = &response->header.wc;
2164 response->header.recv_wc.recv_buf.opa_mad =
2165 (struct opa_mad *)response->mad;
2166 response->header.recv_wc.recv_buf.grh = &response->grh;
2167
2168 agent_send_response((const struct ib_mad_hdr *)response->mad,
2169 &response->grh, wc,
2170 port_priv->device,
2171 opa_smi_get_fwd_port(smp),
2172 qp_info->qp->qp_num,
2173 recv->header.wc.byte_len,
2174 true);
2175
2176 return IB_SMI_DISCARD;
2177 }
2178
2179 return IB_SMI_HANDLE;
2180 }
2181
2182 static enum smi_action
2183 handle_smi(struct ib_mad_port_private *port_priv,
2184 struct ib_mad_qp_info *qp_info,
2185 struct ib_wc *wc,
2186 int port_num,
2187 struct ib_mad_private *recv,
2188 struct ib_mad_private *response,
2189 bool opa)
2190 {
2191 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2192
2193 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2194 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2195 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2196 response);
2197
2198 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2199 }
2200
2201 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2202 {
2203 struct ib_mad_port_private *port_priv = cq->cq_context;
2204 struct ib_mad_list_head *mad_list =
2205 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2206 struct ib_mad_qp_info *qp_info;
2207 struct ib_mad_private_header *mad_priv_hdr;
2208 struct ib_mad_private *recv, *response = NULL;
2209 struct ib_mad_agent_private *mad_agent;
2210 int port_num;
2211 int ret = IB_MAD_RESULT_SUCCESS;
2212 size_t mad_size;
2213 u16 resp_mad_pkey_index = 0;
2214 bool opa;
2215
2216 if (list_empty_careful(&port_priv->port_list))
2217 return;
2218
2219 if (wc->status != IB_WC_SUCCESS) {
2220 /*
2221 * Receive errors indicate that the QP has entered the error
2222 * state - error handling/shutdown code will cleanup
2223 */
2224 return;
2225 }
2226
2227 qp_info = mad_list->mad_queue->qp_info;
2228 dequeue_mad(mad_list);
2229
2230 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2231 qp_info->port_priv->port_num);
2232
2233 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2234 mad_list);
2235 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2236 ib_dma_unmap_single(port_priv->device,
2237 recv->header.mapping,
2238 mad_priv_dma_size(recv),
2239 DMA_FROM_DEVICE);
2240
2241 /* Setup MAD receive work completion from "normal" work completion */
2242 recv->header.wc = *wc;
2243 recv->header.recv_wc.wc = &recv->header.wc;
2244
2245 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2246 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2247 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2248 } else {
2249 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2250 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2251 }
2252
2253 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2254 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2255
2256 if (atomic_read(&qp_info->snoop_count))
2257 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2258
2259 /* Validate MAD */
2260 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2261 goto out;
2262
2263 mad_size = recv->mad_size;
2264 response = alloc_mad_private(mad_size, GFP_KERNEL);
2265 if (!response)
2266 goto out;
2267
2268 if (rdma_cap_ib_switch(port_priv->device))
2269 port_num = wc->port_num;
2270 else
2271 port_num = port_priv->port_num;
2272
2273 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2274 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2275 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2276 response, opa)
2277 == IB_SMI_DISCARD)
2278 goto out;
2279 }
2280
2281 /* Give driver "right of first refusal" on incoming MAD */
2282 if (port_priv->device->process_mad) {
2283 ret = port_priv->device->process_mad(port_priv->device, 0,
2284 port_priv->port_num,
2285 wc, &recv->grh,
2286 (const struct ib_mad_hdr *)recv->mad,
2287 recv->mad_size,
2288 (struct ib_mad_hdr *)response->mad,
2289 &mad_size, &resp_mad_pkey_index);
2290
2291 if (opa)
2292 wc->pkey_index = resp_mad_pkey_index;
2293
2294 if (ret & IB_MAD_RESULT_SUCCESS) {
2295 if (ret & IB_MAD_RESULT_CONSUMED)
2296 goto out;
2297 if (ret & IB_MAD_RESULT_REPLY) {
2298 agent_send_response((const struct ib_mad_hdr *)response->mad,
2299 &recv->grh, wc,
2300 port_priv->device,
2301 port_num,
2302 qp_info->qp->qp_num,
2303 mad_size, opa);
2304 goto out;
2305 }
2306 }
2307 }
2308
2309 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2310 if (mad_agent) {
2311 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2312 /*
2313 * recv is freed up in error cases in ib_mad_complete_recv
2314 * or via recv_handler in ib_mad_complete_recv()
2315 */
2316 recv = NULL;
2317 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2318 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2319 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2320 port_priv->device, port_num,
2321 qp_info->qp->qp_num, mad_size, opa);
2322 }
2323
2324 out:
2325 /* Post another receive request for this QP */
2326 if (response) {
2327 ib_mad_post_receive_mads(qp_info, response);
2328 kfree(recv);
2329 } else
2330 ib_mad_post_receive_mads(qp_info, recv);
2331 }
2332
2333 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2334 {
2335 struct ib_mad_send_wr_private *mad_send_wr;
2336 unsigned long delay;
2337
2338 if (list_empty(&mad_agent_priv->wait_list)) {
2339 cancel_delayed_work(&mad_agent_priv->timed_work);
2340 } else {
2341 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2342 struct ib_mad_send_wr_private,
2343 agent_list);
2344
2345 if (time_after(mad_agent_priv->timeout,
2346 mad_send_wr->timeout)) {
2347 mad_agent_priv->timeout = mad_send_wr->timeout;
2348 delay = mad_send_wr->timeout - jiffies;
2349 if ((long)delay <= 0)
2350 delay = 1;
2351 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2352 &mad_agent_priv->timed_work, delay);
2353 }
2354 }
2355 }
2356
2357 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2358 {
2359 struct ib_mad_agent_private *mad_agent_priv;
2360 struct ib_mad_send_wr_private *temp_mad_send_wr;
2361 struct list_head *list_item;
2362 unsigned long delay;
2363
2364 mad_agent_priv = mad_send_wr->mad_agent_priv;
2365 list_del(&mad_send_wr->agent_list);
2366
2367 delay = mad_send_wr->timeout;
2368 mad_send_wr->timeout += jiffies;
2369
2370 if (delay) {
2371 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2372 temp_mad_send_wr = list_entry(list_item,
2373 struct ib_mad_send_wr_private,
2374 agent_list);
2375 if (time_after(mad_send_wr->timeout,
2376 temp_mad_send_wr->timeout))
2377 break;
2378 }
2379 }
2380 else
2381 list_item = &mad_agent_priv->wait_list;
2382 list_add(&mad_send_wr->agent_list, list_item);
2383
2384 /* Reschedule a work item if we have a shorter timeout */
2385 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2386 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2387 &mad_agent_priv->timed_work, delay);
2388 }
2389
2390 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2391 int timeout_ms)
2392 {
2393 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2394 wait_for_response(mad_send_wr);
2395 }
2396
2397 /*
2398 * Process a send work completion
2399 */
2400 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2401 struct ib_mad_send_wc *mad_send_wc)
2402 {
2403 struct ib_mad_agent_private *mad_agent_priv;
2404 unsigned long flags;
2405 int ret;
2406
2407 mad_agent_priv = mad_send_wr->mad_agent_priv;
2408 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2409 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2410 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2411 if (ret == IB_RMPP_RESULT_CONSUMED)
2412 goto done;
2413 } else
2414 ret = IB_RMPP_RESULT_UNHANDLED;
2415
2416 if (mad_send_wc->status != IB_WC_SUCCESS &&
2417 mad_send_wr->status == IB_WC_SUCCESS) {
2418 mad_send_wr->status = mad_send_wc->status;
2419 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2420 }
2421
2422 if (--mad_send_wr->refcount > 0) {
2423 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2424 mad_send_wr->status == IB_WC_SUCCESS) {
2425 wait_for_response(mad_send_wr);
2426 }
2427 goto done;
2428 }
2429
2430 /* Remove send from MAD agent and notify client of completion */
2431 list_del(&mad_send_wr->agent_list);
2432 adjust_timeout(mad_agent_priv);
2433 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2434
2435 if (mad_send_wr->status != IB_WC_SUCCESS )
2436 mad_send_wc->status = mad_send_wr->status;
2437 if (ret == IB_RMPP_RESULT_INTERNAL)
2438 ib_rmpp_send_handler(mad_send_wc);
2439 else
2440 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2441 mad_send_wc);
2442
2443 /* Release reference on agent taken when sending */
2444 deref_mad_agent(mad_agent_priv);
2445 return;
2446 done:
2447 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2448 }
2449
2450 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2451 {
2452 struct ib_mad_port_private *port_priv = cq->cq_context;
2453 struct ib_mad_list_head *mad_list =
2454 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2455 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2456 struct ib_mad_qp_info *qp_info;
2457 struct ib_mad_queue *send_queue;
2458 struct ib_send_wr *bad_send_wr;
2459 struct ib_mad_send_wc mad_send_wc;
2460 unsigned long flags;
2461 int ret;
2462
2463 if (list_empty_careful(&port_priv->port_list))
2464 return;
2465
2466 if (wc->status != IB_WC_SUCCESS) {
2467 if (!ib_mad_send_error(port_priv, wc))
2468 return;
2469 }
2470
2471 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2472 mad_list);
2473 send_queue = mad_list->mad_queue;
2474 qp_info = send_queue->qp_info;
2475
2476 retry:
2477 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2478 mad_send_wr->header_mapping,
2479 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2480 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2481 mad_send_wr->payload_mapping,
2482 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2483 queued_send_wr = NULL;
2484 spin_lock_irqsave(&send_queue->lock, flags);
2485 list_del(&mad_list->list);
2486
2487 /* Move queued send to the send queue */
2488 if (send_queue->count-- > send_queue->max_active) {
2489 mad_list = container_of(qp_info->overflow_list.next,
2490 struct ib_mad_list_head, list);
2491 queued_send_wr = container_of(mad_list,
2492 struct ib_mad_send_wr_private,
2493 mad_list);
2494 list_move_tail(&mad_list->list, &send_queue->list);
2495 }
2496 spin_unlock_irqrestore(&send_queue->lock, flags);
2497
2498 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2499 mad_send_wc.status = wc->status;
2500 mad_send_wc.vendor_err = wc->vendor_err;
2501 if (atomic_read(&qp_info->snoop_count))
2502 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2503 IB_MAD_SNOOP_SEND_COMPLETIONS);
2504 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2505
2506 if (queued_send_wr) {
2507 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2508 &bad_send_wr);
2509 if (ret) {
2510 dev_err(&port_priv->device->dev,
2511 "ib_post_send failed: %d\n", ret);
2512 mad_send_wr = queued_send_wr;
2513 wc->status = IB_WC_LOC_QP_OP_ERR;
2514 goto retry;
2515 }
2516 }
2517 }
2518
2519 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2520 {
2521 struct ib_mad_send_wr_private *mad_send_wr;
2522 struct ib_mad_list_head *mad_list;
2523 unsigned long flags;
2524
2525 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2526 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2527 mad_send_wr = container_of(mad_list,
2528 struct ib_mad_send_wr_private,
2529 mad_list);
2530 mad_send_wr->retry = 1;
2531 }
2532 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2533 }
2534
2535 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2536 struct ib_wc *wc)
2537 {
2538 struct ib_mad_list_head *mad_list =
2539 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2540 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2541 struct ib_mad_send_wr_private *mad_send_wr;
2542 int ret;
2543
2544 /*
2545 * Send errors will transition the QP to SQE - move
2546 * QP to RTS and repost flushed work requests
2547 */
2548 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2549 mad_list);
2550 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2551 if (mad_send_wr->retry) {
2552 /* Repost send */
2553 struct ib_send_wr *bad_send_wr;
2554
2555 mad_send_wr->retry = 0;
2556 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2557 &bad_send_wr);
2558 if (!ret)
2559 return false;
2560 }
2561 } else {
2562 struct ib_qp_attr *attr;
2563
2564 /* Transition QP to RTS and fail offending send */
2565 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2566 if (attr) {
2567 attr->qp_state = IB_QPS_RTS;
2568 attr->cur_qp_state = IB_QPS_SQE;
2569 ret = ib_modify_qp(qp_info->qp, attr,
2570 IB_QP_STATE | IB_QP_CUR_STATE);
2571 kfree(attr);
2572 if (ret)
2573 dev_err(&port_priv->device->dev,
2574 "%s - ib_modify_qp to RTS: %d\n",
2575 __func__, ret);
2576 else
2577 mark_sends_for_retry(qp_info);
2578 }
2579 }
2580
2581 return true;
2582 }
2583
2584 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2585 {
2586 unsigned long flags;
2587 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2588 struct ib_mad_send_wc mad_send_wc;
2589 struct list_head cancel_list;
2590
2591 INIT_LIST_HEAD(&cancel_list);
2592
2593 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2594 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2595 &mad_agent_priv->send_list, agent_list) {
2596 if (mad_send_wr->status == IB_WC_SUCCESS) {
2597 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2598 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2599 }
2600 }
2601
2602 /* Empty wait list to prevent receives from finding a request */
2603 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2604 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2605
2606 /* Report all cancelled requests */
2607 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2608 mad_send_wc.vendor_err = 0;
2609
2610 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2611 &cancel_list, agent_list) {
2612 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2613 list_del(&mad_send_wr->agent_list);
2614 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2615 &mad_send_wc);
2616 atomic_dec(&mad_agent_priv->refcount);
2617 }
2618 }
2619
2620 static struct ib_mad_send_wr_private*
2621 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2622 struct ib_mad_send_buf *send_buf)
2623 {
2624 struct ib_mad_send_wr_private *mad_send_wr;
2625
2626 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2627 agent_list) {
2628 if (&mad_send_wr->send_buf == send_buf)
2629 return mad_send_wr;
2630 }
2631
2632 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2633 agent_list) {
2634 if (is_rmpp_data_mad(mad_agent_priv,
2635 mad_send_wr->send_buf.mad) &&
2636 &mad_send_wr->send_buf == send_buf)
2637 return mad_send_wr;
2638 }
2639 return NULL;
2640 }
2641
2642 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2643 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2644 {
2645 struct ib_mad_agent_private *mad_agent_priv;
2646 struct ib_mad_send_wr_private *mad_send_wr;
2647 unsigned long flags;
2648 int active;
2649
2650 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2651 agent);
2652 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2653 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2654 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2655 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2656 return -EINVAL;
2657 }
2658
2659 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2660 if (!timeout_ms) {
2661 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2662 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2663 }
2664
2665 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2666 if (active)
2667 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2668 else
2669 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2670
2671 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2672 return 0;
2673 }
2674 EXPORT_SYMBOL(ib_modify_mad);
2675
2676 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2677 struct ib_mad_send_buf *send_buf)
2678 {
2679 ib_modify_mad(mad_agent, send_buf, 0);
2680 }
2681 EXPORT_SYMBOL(ib_cancel_mad);
2682
2683 static void local_completions(struct work_struct *work)
2684 {
2685 struct ib_mad_agent_private *mad_agent_priv;
2686 struct ib_mad_local_private *local;
2687 struct ib_mad_agent_private *recv_mad_agent;
2688 unsigned long flags;
2689 int free_mad;
2690 struct ib_wc wc;
2691 struct ib_mad_send_wc mad_send_wc;
2692 bool opa;
2693
2694 mad_agent_priv =
2695 container_of(work, struct ib_mad_agent_private, local_work);
2696
2697 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2698 mad_agent_priv->qp_info->port_priv->port_num);
2699
2700 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2701 while (!list_empty(&mad_agent_priv->local_list)) {
2702 local = list_entry(mad_agent_priv->local_list.next,
2703 struct ib_mad_local_private,
2704 completion_list);
2705 list_del(&local->completion_list);
2706 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2707 free_mad = 0;
2708 if (local->mad_priv) {
2709 u8 base_version;
2710 recv_mad_agent = local->recv_mad_agent;
2711 if (!recv_mad_agent) {
2712 dev_err(&mad_agent_priv->agent.device->dev,
2713 "No receive MAD agent for local completion\n");
2714 free_mad = 1;
2715 goto local_send_completion;
2716 }
2717
2718 /*
2719 * Defined behavior is to complete response
2720 * before request
2721 */
2722 build_smp_wc(recv_mad_agent->agent.qp,
2723 local->mad_send_wr->send_wr.wr.wr_cqe,
2724 be16_to_cpu(IB_LID_PERMISSIVE),
2725 local->mad_send_wr->send_wr.pkey_index,
2726 recv_mad_agent->agent.port_num, &wc);
2727
2728 local->mad_priv->header.recv_wc.wc = &wc;
2729
2730 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2731 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2732 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2733 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2734 } else {
2735 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2736 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2737 }
2738
2739 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2740 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2741 &local->mad_priv->header.recv_wc.rmpp_list);
2742 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2743 local->mad_priv->header.recv_wc.recv_buf.mad =
2744 (struct ib_mad *)local->mad_priv->mad;
2745 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2746 snoop_recv(recv_mad_agent->qp_info,
2747 &local->mad_priv->header.recv_wc,
2748 IB_MAD_SNOOP_RECVS);
2749 recv_mad_agent->agent.recv_handler(
2750 &recv_mad_agent->agent,
2751 &local->mad_send_wr->send_buf,
2752 &local->mad_priv->header.recv_wc);
2753 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2754 atomic_dec(&recv_mad_agent->refcount);
2755 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2756 }
2757
2758 local_send_completion:
2759 /* Complete send */
2760 mad_send_wc.status = IB_WC_SUCCESS;
2761 mad_send_wc.vendor_err = 0;
2762 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2763 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2764 snoop_send(mad_agent_priv->qp_info,
2765 &local->mad_send_wr->send_buf,
2766 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2767 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2768 &mad_send_wc);
2769
2770 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2771 atomic_dec(&mad_agent_priv->refcount);
2772 if (free_mad)
2773 kfree(local->mad_priv);
2774 kfree(local);
2775 }
2776 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2777 }
2778
2779 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2780 {
2781 int ret;
2782
2783 if (!mad_send_wr->retries_left)
2784 return -ETIMEDOUT;
2785
2786 mad_send_wr->retries_left--;
2787 mad_send_wr->send_buf.retries++;
2788
2789 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2790
2791 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2792 ret = ib_retry_rmpp(mad_send_wr);
2793 switch (ret) {
2794 case IB_RMPP_RESULT_UNHANDLED:
2795 ret = ib_send_mad(mad_send_wr);
2796 break;
2797 case IB_RMPP_RESULT_CONSUMED:
2798 ret = 0;
2799 break;
2800 default:
2801 ret = -ECOMM;
2802 break;
2803 }
2804 } else
2805 ret = ib_send_mad(mad_send_wr);
2806
2807 if (!ret) {
2808 mad_send_wr->refcount++;
2809 list_add_tail(&mad_send_wr->agent_list,
2810 &mad_send_wr->mad_agent_priv->send_list);
2811 }
2812 return ret;
2813 }
2814
2815 static void timeout_sends(struct work_struct *work)
2816 {
2817 struct ib_mad_agent_private *mad_agent_priv;
2818 struct ib_mad_send_wr_private *mad_send_wr;
2819 struct ib_mad_send_wc mad_send_wc;
2820 unsigned long flags, delay;
2821
2822 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2823 timed_work.work);
2824 mad_send_wc.vendor_err = 0;
2825
2826 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2827 while (!list_empty(&mad_agent_priv->wait_list)) {
2828 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2829 struct ib_mad_send_wr_private,
2830 agent_list);
2831
2832 if (time_after(mad_send_wr->timeout, jiffies)) {
2833 delay = mad_send_wr->timeout - jiffies;
2834 if ((long)delay <= 0)
2835 delay = 1;
2836 queue_delayed_work(mad_agent_priv->qp_info->
2837 port_priv->wq,
2838 &mad_agent_priv->timed_work, delay);
2839 break;
2840 }
2841
2842 list_del(&mad_send_wr->agent_list);
2843 if (mad_send_wr->status == IB_WC_SUCCESS &&
2844 !retry_send(mad_send_wr))
2845 continue;
2846
2847 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2848
2849 if (mad_send_wr->status == IB_WC_SUCCESS)
2850 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2851 else
2852 mad_send_wc.status = mad_send_wr->status;
2853 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2854 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2855 &mad_send_wc);
2856
2857 atomic_dec(&mad_agent_priv->refcount);
2858 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2859 }
2860 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2861 }
2862
2863 /*
2864 * Allocate receive MADs and post receive WRs for them
2865 */
2866 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2867 struct ib_mad_private *mad)
2868 {
2869 unsigned long flags;
2870 int post, ret;
2871 struct ib_mad_private *mad_priv;
2872 struct ib_sge sg_list;
2873 struct ib_recv_wr recv_wr, *bad_recv_wr;
2874 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2875
2876 /* Initialize common scatter list fields */
2877 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2878
2879 /* Initialize common receive WR fields */
2880 recv_wr.next = NULL;
2881 recv_wr.sg_list = &sg_list;
2882 recv_wr.num_sge = 1;
2883
2884 do {
2885 /* Allocate and map receive buffer */
2886 if (mad) {
2887 mad_priv = mad;
2888 mad = NULL;
2889 } else {
2890 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2891 GFP_ATOMIC);
2892 if (!mad_priv) {
2893 ret = -ENOMEM;
2894 break;
2895 }
2896 }
2897 sg_list.length = mad_priv_dma_size(mad_priv);
2898 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2899 &mad_priv->grh,
2900 mad_priv_dma_size(mad_priv),
2901 DMA_FROM_DEVICE);
2902 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2903 sg_list.addr))) {
2904 ret = -ENOMEM;
2905 break;
2906 }
2907 mad_priv->header.mapping = sg_list.addr;
2908 mad_priv->header.mad_list.mad_queue = recv_queue;
2909 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2910 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2911
2912 /* Post receive WR */
2913 spin_lock_irqsave(&recv_queue->lock, flags);
2914 post = (++recv_queue->count < recv_queue->max_active);
2915 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2916 spin_unlock_irqrestore(&recv_queue->lock, flags);
2917 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2918 if (ret) {
2919 spin_lock_irqsave(&recv_queue->lock, flags);
2920 list_del(&mad_priv->header.mad_list.list);
2921 recv_queue->count--;
2922 spin_unlock_irqrestore(&recv_queue->lock, flags);
2923 ib_dma_unmap_single(qp_info->port_priv->device,
2924 mad_priv->header.mapping,
2925 mad_priv_dma_size(mad_priv),
2926 DMA_FROM_DEVICE);
2927 kfree(mad_priv);
2928 dev_err(&qp_info->port_priv->device->dev,
2929 "ib_post_recv failed: %d\n", ret);
2930 break;
2931 }
2932 } while (post);
2933
2934 return ret;
2935 }
2936
2937 /*
2938 * Return all the posted receive MADs
2939 */
2940 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2941 {
2942 struct ib_mad_private_header *mad_priv_hdr;
2943 struct ib_mad_private *recv;
2944 struct ib_mad_list_head *mad_list;
2945
2946 if (!qp_info->qp)
2947 return;
2948
2949 while (!list_empty(&qp_info->recv_queue.list)) {
2950
2951 mad_list = list_entry(qp_info->recv_queue.list.next,
2952 struct ib_mad_list_head, list);
2953 mad_priv_hdr = container_of(mad_list,
2954 struct ib_mad_private_header,
2955 mad_list);
2956 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2957 header);
2958
2959 /* Remove from posted receive MAD list */
2960 list_del(&mad_list->list);
2961
2962 ib_dma_unmap_single(qp_info->port_priv->device,
2963 recv->header.mapping,
2964 mad_priv_dma_size(recv),
2965 DMA_FROM_DEVICE);
2966 kfree(recv);
2967 }
2968
2969 qp_info->recv_queue.count = 0;
2970 }
2971
2972 /*
2973 * Start the port
2974 */
2975 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2976 {
2977 int ret, i;
2978 struct ib_qp_attr *attr;
2979 struct ib_qp *qp;
2980 u16 pkey_index;
2981
2982 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2983 if (!attr)
2984 return -ENOMEM;
2985
2986 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2987 IB_DEFAULT_PKEY_FULL, &pkey_index);
2988 if (ret)
2989 pkey_index = 0;
2990
2991 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2992 qp = port_priv->qp_info[i].qp;
2993 if (!qp)
2994 continue;
2995
2996 /*
2997 * PKey index for QP1 is irrelevant but
2998 * one is needed for the Reset to Init transition
2999 */
3000 attr->qp_state = IB_QPS_INIT;
3001 attr->pkey_index = pkey_index;
3002 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3003 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3004 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3005 if (ret) {
3006 dev_err(&port_priv->device->dev,
3007 "Couldn't change QP%d state to INIT: %d\n",
3008 i, ret);
3009 goto out;
3010 }
3011
3012 attr->qp_state = IB_QPS_RTR;
3013 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3014 if (ret) {
3015 dev_err(&port_priv->device->dev,
3016 "Couldn't change QP%d state to RTR: %d\n",
3017 i, ret);
3018 goto out;
3019 }
3020
3021 attr->qp_state = IB_QPS_RTS;
3022 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3023 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3024 if (ret) {
3025 dev_err(&port_priv->device->dev,
3026 "Couldn't change QP%d state to RTS: %d\n",
3027 i, ret);
3028 goto out;
3029 }
3030 }
3031
3032 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3033 if (ret) {
3034 dev_err(&port_priv->device->dev,
3035 "Failed to request completion notification: %d\n",
3036 ret);
3037 goto out;
3038 }
3039
3040 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3041 if (!port_priv->qp_info[i].qp)
3042 continue;
3043
3044 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3045 if (ret) {
3046 dev_err(&port_priv->device->dev,
3047 "Couldn't post receive WRs\n");
3048 goto out;
3049 }
3050 }
3051 out:
3052 kfree(attr);
3053 return ret;
3054 }
3055
3056 static void qp_event_handler(struct ib_event *event, void *qp_context)
3057 {
3058 struct ib_mad_qp_info *qp_info = qp_context;
3059
3060 /* It's worse than that! He's dead, Jim! */
3061 dev_err(&qp_info->port_priv->device->dev,
3062 "Fatal error (%d) on MAD QP (%d)\n",
3063 event->event, qp_info->qp->qp_num);
3064 }
3065
3066 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3067 struct ib_mad_queue *mad_queue)
3068 {
3069 mad_queue->qp_info = qp_info;
3070 mad_queue->count = 0;
3071 spin_lock_init(&mad_queue->lock);
3072 INIT_LIST_HEAD(&mad_queue->list);
3073 }
3074
3075 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3076 struct ib_mad_qp_info *qp_info)
3077 {
3078 qp_info->port_priv = port_priv;
3079 init_mad_queue(qp_info, &qp_info->send_queue);
3080 init_mad_queue(qp_info, &qp_info->recv_queue);
3081 INIT_LIST_HEAD(&qp_info->overflow_list);
3082 spin_lock_init(&qp_info->snoop_lock);
3083 qp_info->snoop_table = NULL;
3084 qp_info->snoop_table_size = 0;
3085 atomic_set(&qp_info->snoop_count, 0);
3086 }
3087
3088 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3089 enum ib_qp_type qp_type)
3090 {
3091 struct ib_qp_init_attr qp_init_attr;
3092 int ret;
3093
3094 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3095 qp_init_attr.send_cq = qp_info->port_priv->cq;
3096 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3097 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3098 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3099 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3100 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3101 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3102 qp_init_attr.qp_type = qp_type;
3103 qp_init_attr.port_num = qp_info->port_priv->port_num;
3104 qp_init_attr.qp_context = qp_info;
3105 qp_init_attr.event_handler = qp_event_handler;
3106 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3107 if (IS_ERR(qp_info->qp)) {
3108 dev_err(&qp_info->port_priv->device->dev,
3109 "Couldn't create ib_mad QP%d\n",
3110 get_spl_qp_index(qp_type));
3111 ret = PTR_ERR(qp_info->qp);
3112 goto error;
3113 }
3114 /* Use minimum queue sizes unless the CQ is resized */
3115 qp_info->send_queue.max_active = mad_sendq_size;
3116 qp_info->recv_queue.max_active = mad_recvq_size;
3117 return 0;
3118
3119 error:
3120 return ret;
3121 }
3122
3123 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3124 {
3125 if (!qp_info->qp)
3126 return;
3127
3128 ib_destroy_qp(qp_info->qp);
3129 kfree(qp_info->snoop_table);
3130 }
3131
3132 /*
3133 * Open the port
3134 * Create the QP, PD, MR, and CQ if needed
3135 */
3136 static int ib_mad_port_open(struct ib_device *device,
3137 int port_num)
3138 {
3139 int ret, cq_size;
3140 struct ib_mad_port_private *port_priv;
3141 unsigned long flags;
3142 char name[sizeof "ib_mad123"];
3143 int has_smi;
3144
3145 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3146 return -EFAULT;
3147
3148 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3149 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3150 return -EFAULT;
3151
3152 /* Create new device info */
3153 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3154 if (!port_priv)
3155 return -ENOMEM;
3156
3157 port_priv->device = device;
3158 port_priv->port_num = port_num;
3159 spin_lock_init(&port_priv->reg_lock);
3160 INIT_LIST_HEAD(&port_priv->agent_list);
3161 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3162 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3163
3164 cq_size = mad_sendq_size + mad_recvq_size;
3165 has_smi = rdma_cap_ib_smi(device, port_num);
3166 if (has_smi)
3167 cq_size *= 2;
3168
3169 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3170 IB_POLL_WORKQUEUE);
3171 if (IS_ERR(port_priv->cq)) {
3172 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3173 ret = PTR_ERR(port_priv->cq);
3174 goto error3;
3175 }
3176
3177 port_priv->pd = ib_alloc_pd(device, 0);
3178 if (IS_ERR(port_priv->pd)) {
3179 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3180 ret = PTR_ERR(port_priv->pd);
3181 goto error4;
3182 }
3183
3184 if (has_smi) {
3185 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3186 if (ret)
3187 goto error6;
3188 }
3189 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3190 if (ret)
3191 goto error7;
3192
3193 snprintf(name, sizeof name, "ib_mad%d", port_num);
3194 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3195 if (!port_priv->wq) {
3196 ret = -ENOMEM;
3197 goto error8;
3198 }
3199
3200 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3201 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3202 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3203
3204 ret = ib_mad_port_start(port_priv);
3205 if (ret) {
3206 dev_err(&device->dev, "Couldn't start port\n");
3207 goto error9;
3208 }
3209
3210 return 0;
3211
3212 error9:
3213 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3214 list_del_init(&port_priv->port_list);
3215 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3216
3217 destroy_workqueue(port_priv->wq);
3218 error8:
3219 destroy_mad_qp(&port_priv->qp_info[1]);
3220 error7:
3221 destroy_mad_qp(&port_priv->qp_info[0]);
3222 error6:
3223 ib_dealloc_pd(port_priv->pd);
3224 error4:
3225 ib_free_cq(port_priv->cq);
3226 cleanup_recv_queue(&port_priv->qp_info[1]);
3227 cleanup_recv_queue(&port_priv->qp_info[0]);
3228 error3:
3229 kfree(port_priv);
3230
3231 return ret;
3232 }
3233
3234 /*
3235 * Close the port
3236 * If there are no classes using the port, free the port
3237 * resources (CQ, MR, PD, QP) and remove the port's info structure
3238 */
3239 static int ib_mad_port_close(struct ib_device *device, int port_num)
3240 {
3241 struct ib_mad_port_private *port_priv;
3242 unsigned long flags;
3243
3244 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3245 port_priv = __ib_get_mad_port(device, port_num);
3246 if (port_priv == NULL) {
3247 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3248 dev_err(&device->dev, "Port %d not found\n", port_num);
3249 return -ENODEV;
3250 }
3251 list_del_init(&port_priv->port_list);
3252 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3253
3254 destroy_workqueue(port_priv->wq);
3255 destroy_mad_qp(&port_priv->qp_info[1]);
3256 destroy_mad_qp(&port_priv->qp_info[0]);
3257 ib_dealloc_pd(port_priv->pd);
3258 ib_free_cq(port_priv->cq);
3259 cleanup_recv_queue(&port_priv->qp_info[1]);
3260 cleanup_recv_queue(&port_priv->qp_info[0]);
3261 /* XXX: Handle deallocation of MAD registration tables */
3262
3263 kfree(port_priv);
3264
3265 return 0;
3266 }
3267
3268 static void ib_mad_init_device(struct ib_device *device)
3269 {
3270 int start, i;
3271
3272 start = rdma_start_port(device);
3273
3274 for (i = start; i <= rdma_end_port(device); i++) {
3275 if (!rdma_cap_ib_mad(device, i))
3276 continue;
3277
3278 if (ib_mad_port_open(device, i)) {
3279 dev_err(&device->dev, "Couldn't open port %d\n", i);
3280 goto error;
3281 }
3282 if (ib_agent_port_open(device, i)) {
3283 dev_err(&device->dev,
3284 "Couldn't open port %d for agents\n", i);
3285 goto error_agent;
3286 }
3287 }
3288 return;
3289
3290 error_agent:
3291 if (ib_mad_port_close(device, i))
3292 dev_err(&device->dev, "Couldn't close port %d\n", i);
3293
3294 error:
3295 while (--i >= start) {
3296 if (!rdma_cap_ib_mad(device, i))
3297 continue;
3298
3299 if (ib_agent_port_close(device, i))
3300 dev_err(&device->dev,
3301 "Couldn't close port %d for agents\n", i);
3302 if (ib_mad_port_close(device, i))
3303 dev_err(&device->dev, "Couldn't close port %d\n", i);
3304 }
3305 }
3306
3307 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3308 {
3309 int i;
3310
3311 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3312 if (!rdma_cap_ib_mad(device, i))
3313 continue;
3314
3315 if (ib_agent_port_close(device, i))
3316 dev_err(&device->dev,
3317 "Couldn't close port %d for agents\n", i);
3318 if (ib_mad_port_close(device, i))
3319 dev_err(&device->dev, "Couldn't close port %d\n", i);
3320 }
3321 }
3322
3323 static struct ib_client mad_client = {
3324 .name = "mad",
3325 .add = ib_mad_init_device,
3326 .remove = ib_mad_remove_device
3327 };
3328
3329 int ib_mad_init(void)
3330 {
3331 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3332 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3333
3334 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3335 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3336
3337 INIT_LIST_HEAD(&ib_mad_port_list);
3338
3339 if (ib_register_client(&mad_client)) {
3340 pr_err("Couldn't register ib_mad client\n");
3341 return -EINVAL;
3342 }
3343
3344 return 0;
3345 }
3346
3347 void ib_mad_cleanup(void)
3348 {
3349 ib_unregister_client(&mad_client);
3350 }
CRIS linux kernel tree