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[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / core / mad.c
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 * Copyright (c) 2014 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 *
36 */
37
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40 #include <linux/dma-mapping.h>
41 #include <linux/slab.h>
42 #include <linux/module.h>
43 #include <rdma/ib_cache.h>
44
45 #include "mad_priv.h"
46 #include "mad_rmpp.h"
47 #include "smi.h"
48 #include "opa_smi.h"
49 #include "agent.h"
50
51 MODULE_LICENSE("Dual BSD/GPL");
52 MODULE_DESCRIPTION("kernel IB MAD API");
53 MODULE_AUTHOR("Hal Rosenstock");
54 MODULE_AUTHOR("Sean Hefty");
55
56 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
57 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
58
59 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
61 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
63
64 static struct list_head ib_mad_port_list;
65 static u32 ib_mad_client_id = 0;
66
67 /* Port list lock */
68 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
69
70 /* Forward declarations */
71 static int method_in_use(struct ib_mad_mgmt_method_table **method,
72 struct ib_mad_reg_req *mad_reg_req);
73 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
74 static struct ib_mad_agent_private *find_mad_agent(
75 struct ib_mad_port_private *port_priv,
76 const struct ib_mad_hdr *mad);
77 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
78 struct ib_mad_private *mad);
79 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
80 static void timeout_sends(struct work_struct *work);
81 static void local_completions(struct work_struct *work);
82 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv,
84 u8 mgmt_class);
85 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
86 struct ib_mad_agent_private *agent_priv);
87
88 /*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92 static inline struct ib_mad_port_private *
93 __ib_get_mad_port(struct ib_device *device, int port_num)
94 {
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102 }
103
104 /*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108 static inline struct ib_mad_port_private *
109 ib_get_mad_port(struct ib_device *device, int port_num)
110 {
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119 }
120
121 static inline u8 convert_mgmt_class(u8 mgmt_class)
122 {
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126 }
127
128 static int get_spl_qp_index(enum ib_qp_type qp_type)
129 {
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139 }
140
141 static int vendor_class_index(u8 mgmt_class)
142 {
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144 }
145
146 static int is_vendor_class(u8 mgmt_class)
147 {
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152 }
153
154 static int is_vendor_oui(char *oui)
155 {
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159 }
160
161 static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164 {
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180 }
181
182 int ib_response_mad(const struct ib_mad_hdr *hdr)
183 {
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188 }
189 EXPORT_SYMBOL(ib_response_mad);
190
191 /*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203 {
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
321 ret = ERR_PTR(-ENODEV);
322 goto error1;
323 }
324
325 /* Verify the QP requested is supported. For example, Ethernet devices
326 * will not have QP0 */
327 if (!port_priv->qp_info[qpn].qp) {
328 dev_notice(&device->dev,
329 "ib_register_mad_agent: QP %d not supported\n", qpn);
330 ret = ERR_PTR(-EPROTONOSUPPORT);
331 goto error1;
332 }
333
334 /* Allocate structures */
335 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
336 if (!mad_agent_priv) {
337 ret = ERR_PTR(-ENOMEM);
338 goto error1;
339 }
340
341 if (mad_reg_req) {
342 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
343 if (!reg_req) {
344 ret = ERR_PTR(-ENOMEM);
345 goto error3;
346 }
347 }
348
349 /* Now, fill in the various structures */
350 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
351 mad_agent_priv->reg_req = reg_req;
352 mad_agent_priv->agent.rmpp_version = rmpp_version;
353 mad_agent_priv->agent.device = device;
354 mad_agent_priv->agent.recv_handler = recv_handler;
355 mad_agent_priv->agent.send_handler = send_handler;
356 mad_agent_priv->agent.context = context;
357 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
358 mad_agent_priv->agent.port_num = port_num;
359 mad_agent_priv->agent.flags = registration_flags;
360 spin_lock_init(&mad_agent_priv->lock);
361 INIT_LIST_HEAD(&mad_agent_priv->send_list);
362 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
363 INIT_LIST_HEAD(&mad_agent_priv->done_list);
364 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
365 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
366 INIT_LIST_HEAD(&mad_agent_priv->local_list);
367 INIT_WORK(&mad_agent_priv->local_work, local_completions);
368 atomic_set(&mad_agent_priv->refcount, 1);
369 init_completion(&mad_agent_priv->comp);
370
371 spin_lock_irqsave(&port_priv->reg_lock, flags);
372 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
373
374 /*
375 * Make sure MAD registration (if supplied)
376 * is non overlapping with any existing ones
377 */
378 if (mad_reg_req) {
379 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
380 if (!is_vendor_class(mgmt_class)) {
381 class = port_priv->version[mad_reg_req->
382 mgmt_class_version].class;
383 if (class) {
384 method = class->method_table[mgmt_class];
385 if (method) {
386 if (method_in_use(&method,
387 mad_reg_req))
388 goto error4;
389 }
390 }
391 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
392 mgmt_class);
393 } else {
394 /* "New" vendor class range */
395 vendor = port_priv->version[mad_reg_req->
396 mgmt_class_version].vendor;
397 if (vendor) {
398 vclass = vendor_class_index(mgmt_class);
399 vendor_class = vendor->vendor_class[vclass];
400 if (vendor_class) {
401 if (is_vendor_method_in_use(
402 vendor_class,
403 mad_reg_req))
404 goto error4;
405 }
406 }
407 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
408 }
409 if (ret2) {
410 ret = ERR_PTR(ret2);
411 goto error4;
412 }
413 }
414
415 /* Add mad agent into port's agent list */
416 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
417 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
418
419 return &mad_agent_priv->agent;
420
421 error4:
422 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
423 kfree(reg_req);
424 error3:
425 kfree(mad_agent_priv);
426 error1:
427 return ret;
428 }
429 EXPORT_SYMBOL(ib_register_mad_agent);
430
431 static inline int is_snooping_sends(int mad_snoop_flags)
432 {
433 return (mad_snoop_flags &
434 (/*IB_MAD_SNOOP_POSTED_SENDS |
435 IB_MAD_SNOOP_RMPP_SENDS |*/
436 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
437 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
438 }
439
440 static inline int is_snooping_recvs(int mad_snoop_flags)
441 {
442 return (mad_snoop_flags &
443 (IB_MAD_SNOOP_RECVS /*|
444 IB_MAD_SNOOP_RMPP_RECVS*/));
445 }
446
447 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
448 struct ib_mad_snoop_private *mad_snoop_priv)
449 {
450 struct ib_mad_snoop_private **new_snoop_table;
451 unsigned long flags;
452 int i;
453
454 spin_lock_irqsave(&qp_info->snoop_lock, flags);
455 /* Check for empty slot in array. */
456 for (i = 0; i < qp_info->snoop_table_size; i++)
457 if (!qp_info->snoop_table[i])
458 break;
459
460 if (i == qp_info->snoop_table_size) {
461 /* Grow table. */
462 new_snoop_table = krealloc(qp_info->snoop_table,
463 sizeof mad_snoop_priv *
464 (qp_info->snoop_table_size + 1),
465 GFP_ATOMIC);
466 if (!new_snoop_table) {
467 i = -ENOMEM;
468 goto out;
469 }
470
471 qp_info->snoop_table = new_snoop_table;
472 qp_info->snoop_table_size++;
473 }
474 qp_info->snoop_table[i] = mad_snoop_priv;
475 atomic_inc(&qp_info->snoop_count);
476 out:
477 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
478 return i;
479 }
480
481 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
482 u8 port_num,
483 enum ib_qp_type qp_type,
484 int mad_snoop_flags,
485 ib_mad_snoop_handler snoop_handler,
486 ib_mad_recv_handler recv_handler,
487 void *context)
488 {
489 struct ib_mad_port_private *port_priv;
490 struct ib_mad_agent *ret;
491 struct ib_mad_snoop_private *mad_snoop_priv;
492 int qpn;
493
494 /* Validate parameters */
495 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
496 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
497 ret = ERR_PTR(-EINVAL);
498 goto error1;
499 }
500 qpn = get_spl_qp_index(qp_type);
501 if (qpn == -1) {
502 ret = ERR_PTR(-EINVAL);
503 goto error1;
504 }
505 port_priv = ib_get_mad_port(device, port_num);
506 if (!port_priv) {
507 ret = ERR_PTR(-ENODEV);
508 goto error1;
509 }
510 /* Allocate structures */
511 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
512 if (!mad_snoop_priv) {
513 ret = ERR_PTR(-ENOMEM);
514 goto error1;
515 }
516
517 /* Now, fill in the various structures */
518 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
519 mad_snoop_priv->agent.device = device;
520 mad_snoop_priv->agent.recv_handler = recv_handler;
521 mad_snoop_priv->agent.snoop_handler = snoop_handler;
522 mad_snoop_priv->agent.context = context;
523 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
524 mad_snoop_priv->agent.port_num = port_num;
525 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
526 init_completion(&mad_snoop_priv->comp);
527 mad_snoop_priv->snoop_index = register_snoop_agent(
528 &port_priv->qp_info[qpn],
529 mad_snoop_priv);
530 if (mad_snoop_priv->snoop_index < 0) {
531 ret = ERR_PTR(mad_snoop_priv->snoop_index);
532 goto error2;
533 }
534
535 atomic_set(&mad_snoop_priv->refcount, 1);
536 return &mad_snoop_priv->agent;
537
538 error2:
539 kfree(mad_snoop_priv);
540 error1:
541 return ret;
542 }
543 EXPORT_SYMBOL(ib_register_mad_snoop);
544
545 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
546 {
547 if (atomic_dec_and_test(&mad_agent_priv->refcount))
548 complete(&mad_agent_priv->comp);
549 }
550
551 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
552 {
553 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
554 complete(&mad_snoop_priv->comp);
555 }
556
557 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
558 {
559 struct ib_mad_port_private *port_priv;
560 unsigned long flags;
561
562 /* Note that we could still be handling received MADs */
563
564 /*
565 * Canceling all sends results in dropping received response
566 * MADs, preventing us from queuing additional work
567 */
568 cancel_mads(mad_agent_priv);
569 port_priv = mad_agent_priv->qp_info->port_priv;
570 cancel_delayed_work(&mad_agent_priv->timed_work);
571
572 spin_lock_irqsave(&port_priv->reg_lock, flags);
573 remove_mad_reg_req(mad_agent_priv);
574 list_del(&mad_agent_priv->agent_list);
575 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
576
577 flush_workqueue(port_priv->wq);
578 ib_cancel_rmpp_recvs(mad_agent_priv);
579
580 deref_mad_agent(mad_agent_priv);
581 wait_for_completion(&mad_agent_priv->comp);
582
583 kfree(mad_agent_priv->reg_req);
584 kfree(mad_agent_priv);
585 }
586
587 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
588 {
589 struct ib_mad_qp_info *qp_info;
590 unsigned long flags;
591
592 qp_info = mad_snoop_priv->qp_info;
593 spin_lock_irqsave(&qp_info->snoop_lock, flags);
594 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
595 atomic_dec(&qp_info->snoop_count);
596 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
597
598 deref_snoop_agent(mad_snoop_priv);
599 wait_for_completion(&mad_snoop_priv->comp);
600
601 kfree(mad_snoop_priv);
602 }
603
604 /*
605 * ib_unregister_mad_agent - Unregisters a client from using MAD services
606 */
607 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
608 {
609 struct ib_mad_agent_private *mad_agent_priv;
610 struct ib_mad_snoop_private *mad_snoop_priv;
611
612 /* If the TID is zero, the agent can only snoop. */
613 if (mad_agent->hi_tid) {
614 mad_agent_priv = container_of(mad_agent,
615 struct ib_mad_agent_private,
616 agent);
617 unregister_mad_agent(mad_agent_priv);
618 } else {
619 mad_snoop_priv = container_of(mad_agent,
620 struct ib_mad_snoop_private,
621 agent);
622 unregister_mad_snoop(mad_snoop_priv);
623 }
624 return 0;
625 }
626 EXPORT_SYMBOL(ib_unregister_mad_agent);
627
628 static void dequeue_mad(struct ib_mad_list_head *mad_list)
629 {
630 struct ib_mad_queue *mad_queue;
631 unsigned long flags;
632
633 BUG_ON(!mad_list->mad_queue);
634 mad_queue = mad_list->mad_queue;
635 spin_lock_irqsave(&mad_queue->lock, flags);
636 list_del(&mad_list->list);
637 mad_queue->count--;
638 spin_unlock_irqrestore(&mad_queue->lock, flags);
639 }
640
641 static void snoop_send(struct ib_mad_qp_info *qp_info,
642 struct ib_mad_send_buf *send_buf,
643 struct ib_mad_send_wc *mad_send_wc,
644 int mad_snoop_flags)
645 {
646 struct ib_mad_snoop_private *mad_snoop_priv;
647 unsigned long flags;
648 int i;
649
650 spin_lock_irqsave(&qp_info->snoop_lock, flags);
651 for (i = 0; i < qp_info->snoop_table_size; i++) {
652 mad_snoop_priv = qp_info->snoop_table[i];
653 if (!mad_snoop_priv ||
654 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
655 continue;
656
657 atomic_inc(&mad_snoop_priv->refcount);
658 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
659 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
660 send_buf, mad_send_wc);
661 deref_snoop_agent(mad_snoop_priv);
662 spin_lock_irqsave(&qp_info->snoop_lock, flags);
663 }
664 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
665 }
666
667 static void snoop_recv(struct ib_mad_qp_info *qp_info,
668 struct ib_mad_recv_wc *mad_recv_wc,
669 int mad_snoop_flags)
670 {
671 struct ib_mad_snoop_private *mad_snoop_priv;
672 unsigned long flags;
673 int i;
674
675 spin_lock_irqsave(&qp_info->snoop_lock, flags);
676 for (i = 0; i < qp_info->snoop_table_size; i++) {
677 mad_snoop_priv = qp_info->snoop_table[i];
678 if (!mad_snoop_priv ||
679 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
680 continue;
681
682 atomic_inc(&mad_snoop_priv->refcount);
683 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
684 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
685 mad_recv_wc);
686 deref_snoop_agent(mad_snoop_priv);
687 spin_lock_irqsave(&qp_info->snoop_lock, flags);
688 }
689 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
690 }
691
692 static void build_smp_wc(struct ib_qp *qp,
693 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
694 struct ib_wc *wc)
695 {
696 memset(wc, 0, sizeof *wc);
697 wc->wr_id = wr_id;
698 wc->status = IB_WC_SUCCESS;
699 wc->opcode = IB_WC_RECV;
700 wc->pkey_index = pkey_index;
701 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
702 wc->src_qp = IB_QP0;
703 wc->qp = qp;
704 wc->slid = slid;
705 wc->sl = 0;
706 wc->dlid_path_bits = 0;
707 wc->port_num = port_num;
708 }
709
710 static size_t mad_priv_size(const struct ib_mad_private *mp)
711 {
712 return sizeof(struct ib_mad_private) + mp->mad_size;
713 }
714
715 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
716 {
717 size_t size = sizeof(struct ib_mad_private) + mad_size;
718 struct ib_mad_private *ret = kzalloc(size, flags);
719
720 if (ret)
721 ret->mad_size = mad_size;
722
723 return ret;
724 }
725
726 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
727 {
728 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
729 }
730
731 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
732 {
733 return sizeof(struct ib_grh) + mp->mad_size;
734 }
735
736 /*
737 * Return 0 if SMP is to be sent
738 * Return 1 if SMP was consumed locally (whether or not solicited)
739 * Return < 0 if error
740 */
741 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
742 struct ib_mad_send_wr_private *mad_send_wr)
743 {
744 int ret = 0;
745 struct ib_smp *smp = mad_send_wr->send_buf.mad;
746 struct opa_smp *opa_smp = (struct opa_smp *)smp;
747 unsigned long flags;
748 struct ib_mad_local_private *local;
749 struct ib_mad_private *mad_priv;
750 struct ib_mad_port_private *port_priv;
751 struct ib_mad_agent_private *recv_mad_agent = NULL;
752 struct ib_device *device = mad_agent_priv->agent.device;
753 u8 port_num;
754 struct ib_wc mad_wc;
755 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
756 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
757 u16 out_mad_pkey_index = 0;
758 u16 drslid;
759 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
760 mad_agent_priv->qp_info->port_priv->port_num);
761
762 if (rdma_cap_ib_switch(device) &&
763 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
764 port_num = send_wr->port_num;
765 else
766 port_num = mad_agent_priv->agent.port_num;
767
768 /*
769 * Directed route handling starts if the initial LID routed part of
770 * a request or the ending LID routed part of a response is empty.
771 * If we are at the start of the LID routed part, don't update the
772 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
773 */
774 if (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
775 u32 opa_drslid;
776
777 if ((opa_get_smp_direction(opa_smp)
778 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
779 OPA_LID_PERMISSIVE &&
780 opa_smi_handle_dr_smp_send(opa_smp,
781 rdma_cap_ib_switch(device),
782 port_num) == IB_SMI_DISCARD) {
783 ret = -EINVAL;
784 dev_err(&device->dev, "OPA Invalid directed route\n");
785 goto out;
786 }
787 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
788 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
789 opa_drslid & 0xffff0000) {
790 ret = -EINVAL;
791 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
792 opa_drslid);
793 goto out;
794 }
795 drslid = (u16)(opa_drslid & 0x0000ffff);
796
797 /* Check to post send on QP or process locally */
798 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
799 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
800 goto out;
801 } else {
802 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
803 IB_LID_PERMISSIVE &&
804 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
805 IB_SMI_DISCARD) {
806 ret = -EINVAL;
807 dev_err(&device->dev, "Invalid directed route\n");
808 goto out;
809 }
810 drslid = be16_to_cpu(smp->dr_slid);
811
812 /* Check to post send on QP or process locally */
813 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
814 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
815 goto out;
816 }
817
818 local = kmalloc(sizeof *local, GFP_ATOMIC);
819 if (!local) {
820 ret = -ENOMEM;
821 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
822 goto out;
823 }
824 local->mad_priv = NULL;
825 local->recv_mad_agent = NULL;
826 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
827 if (!mad_priv) {
828 ret = -ENOMEM;
829 dev_err(&device->dev, "No memory for local response MAD\n");
830 kfree(local);
831 goto out;
832 }
833
834 build_smp_wc(mad_agent_priv->agent.qp,
835 send_wr->wr.wr_id, drslid,
836 send_wr->pkey_index,
837 send_wr->port_num, &mad_wc);
838
839 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
840 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
841 + mad_send_wr->send_buf.data_len
842 + sizeof(struct ib_grh);
843 }
844
845 /* No GRH for DR SMP */
846 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
847 (const struct ib_mad_hdr *)smp, mad_size,
848 (struct ib_mad_hdr *)mad_priv->mad,
849 &mad_size, &out_mad_pkey_index);
850 switch (ret)
851 {
852 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
853 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
854 mad_agent_priv->agent.recv_handler) {
855 local->mad_priv = mad_priv;
856 local->recv_mad_agent = mad_agent_priv;
857 /*
858 * Reference MAD agent until receive
859 * side of local completion handled
860 */
861 atomic_inc(&mad_agent_priv->refcount);
862 } else
863 kfree(mad_priv);
864 break;
865 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
866 kfree(mad_priv);
867 break;
868 case IB_MAD_RESULT_SUCCESS:
869 /* Treat like an incoming receive MAD */
870 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
871 mad_agent_priv->agent.port_num);
872 if (port_priv) {
873 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
874 recv_mad_agent = find_mad_agent(port_priv,
875 (const struct ib_mad_hdr *)mad_priv->mad);
876 }
877 if (!port_priv || !recv_mad_agent) {
878 /*
879 * No receiving agent so drop packet and
880 * generate send completion.
881 */
882 kfree(mad_priv);
883 break;
884 }
885 local->mad_priv = mad_priv;
886 local->recv_mad_agent = recv_mad_agent;
887 break;
888 default:
889 kfree(mad_priv);
890 kfree(local);
891 ret = -EINVAL;
892 goto out;
893 }
894
895 local->mad_send_wr = mad_send_wr;
896 if (opa) {
897 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
898 local->return_wc_byte_len = mad_size;
899 }
900 /* Reference MAD agent until send side of local completion handled */
901 atomic_inc(&mad_agent_priv->refcount);
902 /* Queue local completion to local list */
903 spin_lock_irqsave(&mad_agent_priv->lock, flags);
904 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
905 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
906 queue_work(mad_agent_priv->qp_info->port_priv->wq,
907 &mad_agent_priv->local_work);
908 ret = 1;
909 out:
910 return ret;
911 }
912
913 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
914 {
915 int seg_size, pad;
916
917 seg_size = mad_size - hdr_len;
918 if (data_len && seg_size) {
919 pad = seg_size - data_len % seg_size;
920 return pad == seg_size ? 0 : pad;
921 } else
922 return seg_size;
923 }
924
925 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
926 {
927 struct ib_rmpp_segment *s, *t;
928
929 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
930 list_del(&s->list);
931 kfree(s);
932 }
933 }
934
935 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
936 size_t mad_size, gfp_t gfp_mask)
937 {
938 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
939 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
940 struct ib_rmpp_segment *seg = NULL;
941 int left, seg_size, pad;
942
943 send_buf->seg_size = mad_size - send_buf->hdr_len;
944 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
945 seg_size = send_buf->seg_size;
946 pad = send_wr->pad;
947
948 /* Allocate data segments. */
949 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
950 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
951 if (!seg) {
952 dev_err(&send_buf->mad_agent->device->dev,
953 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
954 sizeof (*seg) + seg_size, gfp_mask);
955 free_send_rmpp_list(send_wr);
956 return -ENOMEM;
957 }
958 seg->num = ++send_buf->seg_count;
959 list_add_tail(&seg->list, &send_wr->rmpp_list);
960 }
961
962 /* Zero any padding */
963 if (pad)
964 memset(seg->data + seg_size - pad, 0, pad);
965
966 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
967 agent.rmpp_version;
968 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
969 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
970
971 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
972 struct ib_rmpp_segment, list);
973 send_wr->last_ack_seg = send_wr->cur_seg;
974 return 0;
975 }
976
977 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
978 {
979 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
980 }
981 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
982
983 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
984 u32 remote_qpn, u16 pkey_index,
985 int rmpp_active,
986 int hdr_len, int data_len,
987 gfp_t gfp_mask,
988 u8 base_version)
989 {
990 struct ib_mad_agent_private *mad_agent_priv;
991 struct ib_mad_send_wr_private *mad_send_wr;
992 int pad, message_size, ret, size;
993 void *buf;
994 size_t mad_size;
995 bool opa;
996
997 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
998 agent);
999
1000 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1001
1002 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1003 mad_size = sizeof(struct opa_mad);
1004 else
1005 mad_size = sizeof(struct ib_mad);
1006
1007 pad = get_pad_size(hdr_len, data_len, mad_size);
1008 message_size = hdr_len + data_len + pad;
1009
1010 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1011 if (!rmpp_active && message_size > mad_size)
1012 return ERR_PTR(-EINVAL);
1013 } else
1014 if (rmpp_active || message_size > mad_size)
1015 return ERR_PTR(-EINVAL);
1016
1017 size = rmpp_active ? hdr_len : mad_size;
1018 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1019 if (!buf)
1020 return ERR_PTR(-ENOMEM);
1021
1022 mad_send_wr = buf + size;
1023 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1024 mad_send_wr->send_buf.mad = buf;
1025 mad_send_wr->send_buf.hdr_len = hdr_len;
1026 mad_send_wr->send_buf.data_len = data_len;
1027 mad_send_wr->pad = pad;
1028
1029 mad_send_wr->mad_agent_priv = mad_agent_priv;
1030 mad_send_wr->sg_list[0].length = hdr_len;
1031 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1032
1033 /* OPA MADs don't have to be the full 2048 bytes */
1034 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1035 data_len < mad_size - hdr_len)
1036 mad_send_wr->sg_list[1].length = data_len;
1037 else
1038 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1039
1040 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1041
1042 mad_send_wr->send_wr.wr.wr_id = (unsigned long) mad_send_wr;
1043 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1044 mad_send_wr->send_wr.wr.num_sge = 2;
1045 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1046 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1047 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1048 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1049 mad_send_wr->send_wr.pkey_index = pkey_index;
1050
1051 if (rmpp_active) {
1052 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1053 if (ret) {
1054 kfree(buf);
1055 return ERR_PTR(ret);
1056 }
1057 }
1058
1059 mad_send_wr->send_buf.mad_agent = mad_agent;
1060 atomic_inc(&mad_agent_priv->refcount);
1061 return &mad_send_wr->send_buf;
1062 }
1063 EXPORT_SYMBOL(ib_create_send_mad);
1064
1065 int ib_get_mad_data_offset(u8 mgmt_class)
1066 {
1067 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1068 return IB_MGMT_SA_HDR;
1069 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1070 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1071 (mgmt_class == IB_MGMT_CLASS_BIS))
1072 return IB_MGMT_DEVICE_HDR;
1073 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1074 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1075 return IB_MGMT_VENDOR_HDR;
1076 else
1077 return IB_MGMT_MAD_HDR;
1078 }
1079 EXPORT_SYMBOL(ib_get_mad_data_offset);
1080
1081 int ib_is_mad_class_rmpp(u8 mgmt_class)
1082 {
1083 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1084 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1085 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1086 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1087 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1088 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1089 return 1;
1090 return 0;
1091 }
1092 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1093
1094 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1095 {
1096 struct ib_mad_send_wr_private *mad_send_wr;
1097 struct list_head *list;
1098
1099 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1100 send_buf);
1101 list = &mad_send_wr->cur_seg->list;
1102
1103 if (mad_send_wr->cur_seg->num < seg_num) {
1104 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1105 if (mad_send_wr->cur_seg->num == seg_num)
1106 break;
1107 } else if (mad_send_wr->cur_seg->num > seg_num) {
1108 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1109 if (mad_send_wr->cur_seg->num == seg_num)
1110 break;
1111 }
1112 return mad_send_wr->cur_seg->data;
1113 }
1114 EXPORT_SYMBOL(ib_get_rmpp_segment);
1115
1116 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1117 {
1118 if (mad_send_wr->send_buf.seg_count)
1119 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1120 mad_send_wr->seg_num);
1121 else
1122 return mad_send_wr->send_buf.mad +
1123 mad_send_wr->send_buf.hdr_len;
1124 }
1125
1126 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1127 {
1128 struct ib_mad_agent_private *mad_agent_priv;
1129 struct ib_mad_send_wr_private *mad_send_wr;
1130
1131 mad_agent_priv = container_of(send_buf->mad_agent,
1132 struct ib_mad_agent_private, agent);
1133 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1134 send_buf);
1135
1136 free_send_rmpp_list(mad_send_wr);
1137 kfree(send_buf->mad);
1138 deref_mad_agent(mad_agent_priv);
1139 }
1140 EXPORT_SYMBOL(ib_free_send_mad);
1141
1142 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1143 {
1144 struct ib_mad_qp_info *qp_info;
1145 struct list_head *list;
1146 struct ib_send_wr *bad_send_wr;
1147 struct ib_mad_agent *mad_agent;
1148 struct ib_sge *sge;
1149 unsigned long flags;
1150 int ret;
1151
1152 /* Set WR ID to find mad_send_wr upon completion */
1153 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1154 mad_send_wr->send_wr.wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1155 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1156
1157 mad_agent = mad_send_wr->send_buf.mad_agent;
1158 sge = mad_send_wr->sg_list;
1159 sge[0].addr = ib_dma_map_single(mad_agent->device,
1160 mad_send_wr->send_buf.mad,
1161 sge[0].length,
1162 DMA_TO_DEVICE);
1163 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1164 return -ENOMEM;
1165
1166 mad_send_wr->header_mapping = sge[0].addr;
1167
1168 sge[1].addr = ib_dma_map_single(mad_agent->device,
1169 ib_get_payload(mad_send_wr),
1170 sge[1].length,
1171 DMA_TO_DEVICE);
1172 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1173 ib_dma_unmap_single(mad_agent->device,
1174 mad_send_wr->header_mapping,
1175 sge[0].length, DMA_TO_DEVICE);
1176 return -ENOMEM;
1177 }
1178 mad_send_wr->payload_mapping = sge[1].addr;
1179
1180 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1181 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1182 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1183 &bad_send_wr);
1184 list = &qp_info->send_queue.list;
1185 } else {
1186 ret = 0;
1187 list = &qp_info->overflow_list;
1188 }
1189
1190 if (!ret) {
1191 qp_info->send_queue.count++;
1192 list_add_tail(&mad_send_wr->mad_list.list, list);
1193 }
1194 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1195 if (ret) {
1196 ib_dma_unmap_single(mad_agent->device,
1197 mad_send_wr->header_mapping,
1198 sge[0].length, DMA_TO_DEVICE);
1199 ib_dma_unmap_single(mad_agent->device,
1200 mad_send_wr->payload_mapping,
1201 sge[1].length, DMA_TO_DEVICE);
1202 }
1203 return ret;
1204 }
1205
1206 /*
1207 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1208 * with the registered client
1209 */
1210 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1211 struct ib_mad_send_buf **bad_send_buf)
1212 {
1213 struct ib_mad_agent_private *mad_agent_priv;
1214 struct ib_mad_send_buf *next_send_buf;
1215 struct ib_mad_send_wr_private *mad_send_wr;
1216 unsigned long flags;
1217 int ret = -EINVAL;
1218
1219 /* Walk list of send WRs and post each on send list */
1220 for (; send_buf; send_buf = next_send_buf) {
1221
1222 mad_send_wr = container_of(send_buf,
1223 struct ib_mad_send_wr_private,
1224 send_buf);
1225 mad_agent_priv = mad_send_wr->mad_agent_priv;
1226
1227 if (!send_buf->mad_agent->send_handler ||
1228 (send_buf->timeout_ms &&
1229 !send_buf->mad_agent->recv_handler)) {
1230 ret = -EINVAL;
1231 goto error;
1232 }
1233
1234 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1235 if (mad_agent_priv->agent.rmpp_version) {
1236 ret = -EINVAL;
1237 goto error;
1238 }
1239 }
1240
1241 /*
1242 * Save pointer to next work request to post in case the
1243 * current one completes, and the user modifies the work
1244 * request associated with the completion
1245 */
1246 next_send_buf = send_buf->next;
1247 mad_send_wr->send_wr.ah = send_buf->ah;
1248
1249 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1250 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1251 ret = handle_outgoing_dr_smp(mad_agent_priv,
1252 mad_send_wr);
1253 if (ret < 0) /* error */
1254 goto error;
1255 else if (ret == 1) /* locally consumed */
1256 continue;
1257 }
1258
1259 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1260 /* Timeout will be updated after send completes */
1261 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1262 mad_send_wr->max_retries = send_buf->retries;
1263 mad_send_wr->retries_left = send_buf->retries;
1264 send_buf->retries = 0;
1265 /* Reference for work request to QP + response */
1266 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1267 mad_send_wr->status = IB_WC_SUCCESS;
1268
1269 /* Reference MAD agent until send completes */
1270 atomic_inc(&mad_agent_priv->refcount);
1271 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1272 list_add_tail(&mad_send_wr->agent_list,
1273 &mad_agent_priv->send_list);
1274 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1275
1276 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1277 ret = ib_send_rmpp_mad(mad_send_wr);
1278 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1279 ret = ib_send_mad(mad_send_wr);
1280 } else
1281 ret = ib_send_mad(mad_send_wr);
1282 if (ret < 0) {
1283 /* Fail send request */
1284 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1285 list_del(&mad_send_wr->agent_list);
1286 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1287 atomic_dec(&mad_agent_priv->refcount);
1288 goto error;
1289 }
1290 }
1291 return 0;
1292 error:
1293 if (bad_send_buf)
1294 *bad_send_buf = send_buf;
1295 return ret;
1296 }
1297 EXPORT_SYMBOL(ib_post_send_mad);
1298
1299 /*
1300 * ib_free_recv_mad - Returns data buffers used to receive
1301 * a MAD to the access layer
1302 */
1303 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1304 {
1305 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1306 struct ib_mad_private_header *mad_priv_hdr;
1307 struct ib_mad_private *priv;
1308 struct list_head free_list;
1309
1310 INIT_LIST_HEAD(&free_list);
1311 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1312
1313 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1314 &free_list, list) {
1315 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1316 recv_buf);
1317 mad_priv_hdr = container_of(mad_recv_wc,
1318 struct ib_mad_private_header,
1319 recv_wc);
1320 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1321 header);
1322 kfree(priv);
1323 }
1324 }
1325 EXPORT_SYMBOL(ib_free_recv_mad);
1326
1327 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1328 u8 rmpp_version,
1329 ib_mad_send_handler send_handler,
1330 ib_mad_recv_handler recv_handler,
1331 void *context)
1332 {
1333 return ERR_PTR(-EINVAL); /* XXX: for now */
1334 }
1335 EXPORT_SYMBOL(ib_redirect_mad_qp);
1336
1337 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1338 struct ib_wc *wc)
1339 {
1340 dev_err(&mad_agent->device->dev,
1341 "ib_process_mad_wc() not implemented yet\n");
1342 return 0;
1343 }
1344 EXPORT_SYMBOL(ib_process_mad_wc);
1345
1346 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1347 struct ib_mad_reg_req *mad_reg_req)
1348 {
1349 int i;
1350
1351 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1352 if ((*method)->agent[i]) {
1353 pr_err("Method %d already in use\n", i);
1354 return -EINVAL;
1355 }
1356 }
1357 return 0;
1358 }
1359
1360 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1361 {
1362 /* Allocate management method table */
1363 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1364 if (!*method) {
1365 pr_err("No memory for ib_mad_mgmt_method_table\n");
1366 return -ENOMEM;
1367 }
1368
1369 return 0;
1370 }
1371
1372 /*
1373 * Check to see if there are any methods still in use
1374 */
1375 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1376 {
1377 int i;
1378
1379 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1380 if (method->agent[i])
1381 return 1;
1382 return 0;
1383 }
1384
1385 /*
1386 * Check to see if there are any method tables for this class still in use
1387 */
1388 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1389 {
1390 int i;
1391
1392 for (i = 0; i < MAX_MGMT_CLASS; i++)
1393 if (class->method_table[i])
1394 return 1;
1395 return 0;
1396 }
1397
1398 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1399 {
1400 int i;
1401
1402 for (i = 0; i < MAX_MGMT_OUI; i++)
1403 if (vendor_class->method_table[i])
1404 return 1;
1405 return 0;
1406 }
1407
1408 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1409 const char *oui)
1410 {
1411 int i;
1412
1413 for (i = 0; i < MAX_MGMT_OUI; i++)
1414 /* Is there matching OUI for this vendor class ? */
1415 if (!memcmp(vendor_class->oui[i], oui, 3))
1416 return i;
1417
1418 return -1;
1419 }
1420
1421 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1422 {
1423 int i;
1424
1425 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1426 if (vendor->vendor_class[i])
1427 return 1;
1428
1429 return 0;
1430 }
1431
1432 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1433 struct ib_mad_agent_private *agent)
1434 {
1435 int i;
1436
1437 /* Remove any methods for this mad agent */
1438 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1439 if (method->agent[i] == agent) {
1440 method->agent[i] = NULL;
1441 }
1442 }
1443 }
1444
1445 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1446 struct ib_mad_agent_private *agent_priv,
1447 u8 mgmt_class)
1448 {
1449 struct ib_mad_port_private *port_priv;
1450 struct ib_mad_mgmt_class_table **class;
1451 struct ib_mad_mgmt_method_table **method;
1452 int i, ret;
1453
1454 port_priv = agent_priv->qp_info->port_priv;
1455 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1456 if (!*class) {
1457 /* Allocate management class table for "new" class version */
1458 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1459 if (!*class) {
1460 dev_err(&agent_priv->agent.device->dev,
1461 "No memory for ib_mad_mgmt_class_table\n");
1462 ret = -ENOMEM;
1463 goto error1;
1464 }
1465
1466 /* Allocate method table for this management class */
1467 method = &(*class)->method_table[mgmt_class];
1468 if ((ret = allocate_method_table(method)))
1469 goto error2;
1470 } else {
1471 method = &(*class)->method_table[mgmt_class];
1472 if (!*method) {
1473 /* Allocate method table for this management class */
1474 if ((ret = allocate_method_table(method)))
1475 goto error1;
1476 }
1477 }
1478
1479 /* Now, make sure methods are not already in use */
1480 if (method_in_use(method, mad_reg_req))
1481 goto error3;
1482
1483 /* Finally, add in methods being registered */
1484 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1485 (*method)->agent[i] = agent_priv;
1486
1487 return 0;
1488
1489 error3:
1490 /* Remove any methods for this mad agent */
1491 remove_methods_mad_agent(*method, agent_priv);
1492 /* Now, check to see if there are any methods in use */
1493 if (!check_method_table(*method)) {
1494 /* If not, release management method table */
1495 kfree(*method);
1496 *method = NULL;
1497 }
1498 ret = -EINVAL;
1499 goto error1;
1500 error2:
1501 kfree(*class);
1502 *class = NULL;
1503 error1:
1504 return ret;
1505 }
1506
1507 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1508 struct ib_mad_agent_private *agent_priv)
1509 {
1510 struct ib_mad_port_private *port_priv;
1511 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1512 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1513 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1514 struct ib_mad_mgmt_method_table **method;
1515 int i, ret = -ENOMEM;
1516 u8 vclass;
1517
1518 /* "New" vendor (with OUI) class */
1519 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1520 port_priv = agent_priv->qp_info->port_priv;
1521 vendor_table = &port_priv->version[
1522 mad_reg_req->mgmt_class_version].vendor;
1523 if (!*vendor_table) {
1524 /* Allocate mgmt vendor class table for "new" class version */
1525 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1526 if (!vendor) {
1527 dev_err(&agent_priv->agent.device->dev,
1528 "No memory for ib_mad_mgmt_vendor_class_table\n");
1529 goto error1;
1530 }
1531
1532 *vendor_table = vendor;
1533 }
1534 if (!(*vendor_table)->vendor_class[vclass]) {
1535 /* Allocate table for this management vendor class */
1536 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1537 if (!vendor_class) {
1538 dev_err(&agent_priv->agent.device->dev,
1539 "No memory for ib_mad_mgmt_vendor_class\n");
1540 goto error2;
1541 }
1542
1543 (*vendor_table)->vendor_class[vclass] = vendor_class;
1544 }
1545 for (i = 0; i < MAX_MGMT_OUI; i++) {
1546 /* Is there matching OUI for this vendor class ? */
1547 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1548 mad_reg_req->oui, 3)) {
1549 method = &(*vendor_table)->vendor_class[
1550 vclass]->method_table[i];
1551 BUG_ON(!*method);
1552 goto check_in_use;
1553 }
1554 }
1555 for (i = 0; i < MAX_MGMT_OUI; i++) {
1556 /* OUI slot available ? */
1557 if (!is_vendor_oui((*vendor_table)->vendor_class[
1558 vclass]->oui[i])) {
1559 method = &(*vendor_table)->vendor_class[
1560 vclass]->method_table[i];
1561 BUG_ON(*method);
1562 /* Allocate method table for this OUI */
1563 if ((ret = allocate_method_table(method)))
1564 goto error3;
1565 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1566 mad_reg_req->oui, 3);
1567 goto check_in_use;
1568 }
1569 }
1570 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1571 goto error3;
1572
1573 check_in_use:
1574 /* Now, make sure methods are not already in use */
1575 if (method_in_use(method, mad_reg_req))
1576 goto error4;
1577
1578 /* Finally, add in methods being registered */
1579 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1580 (*method)->agent[i] = agent_priv;
1581
1582 return 0;
1583
1584 error4:
1585 /* Remove any methods for this mad agent */
1586 remove_methods_mad_agent(*method, agent_priv);
1587 /* Now, check to see if there are any methods in use */
1588 if (!check_method_table(*method)) {
1589 /* If not, release management method table */
1590 kfree(*method);
1591 *method = NULL;
1592 }
1593 ret = -EINVAL;
1594 error3:
1595 if (vendor_class) {
1596 (*vendor_table)->vendor_class[vclass] = NULL;
1597 kfree(vendor_class);
1598 }
1599 error2:
1600 if (vendor) {
1601 *vendor_table = NULL;
1602 kfree(vendor);
1603 }
1604 error1:
1605 return ret;
1606 }
1607
1608 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1609 {
1610 struct ib_mad_port_private *port_priv;
1611 struct ib_mad_mgmt_class_table *class;
1612 struct ib_mad_mgmt_method_table *method;
1613 struct ib_mad_mgmt_vendor_class_table *vendor;
1614 struct ib_mad_mgmt_vendor_class *vendor_class;
1615 int index;
1616 u8 mgmt_class;
1617
1618 /*
1619 * Was MAD registration request supplied
1620 * with original registration ?
1621 */
1622 if (!agent_priv->reg_req) {
1623 goto out;
1624 }
1625
1626 port_priv = agent_priv->qp_info->port_priv;
1627 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1628 class = port_priv->version[
1629 agent_priv->reg_req->mgmt_class_version].class;
1630 if (!class)
1631 goto vendor_check;
1632
1633 method = class->method_table[mgmt_class];
1634 if (method) {
1635 /* Remove any methods for this mad agent */
1636 remove_methods_mad_agent(method, agent_priv);
1637 /* Now, check to see if there are any methods still in use */
1638 if (!check_method_table(method)) {
1639 /* If not, release management method table */
1640 kfree(method);
1641 class->method_table[mgmt_class] = NULL;
1642 /* Any management classes left ? */
1643 if (!check_class_table(class)) {
1644 /* If not, release management class table */
1645 kfree(class);
1646 port_priv->version[
1647 agent_priv->reg_req->
1648 mgmt_class_version].class = NULL;
1649 }
1650 }
1651 }
1652
1653 vendor_check:
1654 if (!is_vendor_class(mgmt_class))
1655 goto out;
1656
1657 /* normalize mgmt_class to vendor range 2 */
1658 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1659 vendor = port_priv->version[
1660 agent_priv->reg_req->mgmt_class_version].vendor;
1661
1662 if (!vendor)
1663 goto out;
1664
1665 vendor_class = vendor->vendor_class[mgmt_class];
1666 if (vendor_class) {
1667 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1668 if (index < 0)
1669 goto out;
1670 method = vendor_class->method_table[index];
1671 if (method) {
1672 /* Remove any methods for this mad agent */
1673 remove_methods_mad_agent(method, agent_priv);
1674 /*
1675 * Now, check to see if there are
1676 * any methods still in use
1677 */
1678 if (!check_method_table(method)) {
1679 /* If not, release management method table */
1680 kfree(method);
1681 vendor_class->method_table[index] = NULL;
1682 memset(vendor_class->oui[index], 0, 3);
1683 /* Any OUIs left ? */
1684 if (!check_vendor_class(vendor_class)) {
1685 /* If not, release vendor class table */
1686 kfree(vendor_class);
1687 vendor->vendor_class[mgmt_class] = NULL;
1688 /* Any other vendor classes left ? */
1689 if (!check_vendor_table(vendor)) {
1690 kfree(vendor);
1691 port_priv->version[
1692 agent_priv->reg_req->
1693 mgmt_class_version].
1694 vendor = NULL;
1695 }
1696 }
1697 }
1698 }
1699 }
1700
1701 out:
1702 return;
1703 }
1704
1705 static struct ib_mad_agent_private *
1706 find_mad_agent(struct ib_mad_port_private *port_priv,
1707 const struct ib_mad_hdr *mad_hdr)
1708 {
1709 struct ib_mad_agent_private *mad_agent = NULL;
1710 unsigned long flags;
1711
1712 spin_lock_irqsave(&port_priv->reg_lock, flags);
1713 if (ib_response_mad(mad_hdr)) {
1714 u32 hi_tid;
1715 struct ib_mad_agent_private *entry;
1716
1717 /*
1718 * Routing is based on high 32 bits of transaction ID
1719 * of MAD.
1720 */
1721 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1722 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1723 if (entry->agent.hi_tid == hi_tid) {
1724 mad_agent = entry;
1725 break;
1726 }
1727 }
1728 } else {
1729 struct ib_mad_mgmt_class_table *class;
1730 struct ib_mad_mgmt_method_table *method;
1731 struct ib_mad_mgmt_vendor_class_table *vendor;
1732 struct ib_mad_mgmt_vendor_class *vendor_class;
1733 const struct ib_vendor_mad *vendor_mad;
1734 int index;
1735
1736 /*
1737 * Routing is based on version, class, and method
1738 * For "newer" vendor MADs, also based on OUI
1739 */
1740 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1741 goto out;
1742 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1743 class = port_priv->version[
1744 mad_hdr->class_version].class;
1745 if (!class)
1746 goto out;
1747 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1748 IB_MGMT_MAX_METHODS)
1749 goto out;
1750 method = class->method_table[convert_mgmt_class(
1751 mad_hdr->mgmt_class)];
1752 if (method)
1753 mad_agent = method->agent[mad_hdr->method &
1754 ~IB_MGMT_METHOD_RESP];
1755 } else {
1756 vendor = port_priv->version[
1757 mad_hdr->class_version].vendor;
1758 if (!vendor)
1759 goto out;
1760 vendor_class = vendor->vendor_class[vendor_class_index(
1761 mad_hdr->mgmt_class)];
1762 if (!vendor_class)
1763 goto out;
1764 /* Find matching OUI */
1765 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1766 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1767 if (index == -1)
1768 goto out;
1769 method = vendor_class->method_table[index];
1770 if (method) {
1771 mad_agent = method->agent[mad_hdr->method &
1772 ~IB_MGMT_METHOD_RESP];
1773 }
1774 }
1775 }
1776
1777 if (mad_agent) {
1778 if (mad_agent->agent.recv_handler)
1779 atomic_inc(&mad_agent->refcount);
1780 else {
1781 dev_notice(&port_priv->device->dev,
1782 "No receive handler for client %p on port %d\n",
1783 &mad_agent->agent, port_priv->port_num);
1784 mad_agent = NULL;
1785 }
1786 }
1787 out:
1788 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1789
1790 return mad_agent;
1791 }
1792
1793 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1794 const struct ib_mad_qp_info *qp_info,
1795 bool opa)
1796 {
1797 int valid = 0;
1798 u32 qp_num = qp_info->qp->qp_num;
1799
1800 /* Make sure MAD base version is understood */
1801 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1802 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1803 pr_err("MAD received with unsupported base version %d %s\n",
1804 mad_hdr->base_version, opa ? "(opa)" : "");
1805 goto out;
1806 }
1807
1808 /* Filter SMI packets sent to other than QP0 */
1809 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1810 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1811 if (qp_num == 0)
1812 valid = 1;
1813 } else {
1814 /* Filter GSI packets sent to QP0 */
1815 if (qp_num != 0)
1816 valid = 1;
1817 }
1818
1819 out:
1820 return valid;
1821 }
1822
1823 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1824 const struct ib_mad_hdr *mad_hdr)
1825 {
1826 struct ib_rmpp_mad *rmpp_mad;
1827
1828 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1829 return !mad_agent_priv->agent.rmpp_version ||
1830 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1831 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1832 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1833 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1834 }
1835
1836 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1837 const struct ib_mad_recv_wc *rwc)
1838 {
1839 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1840 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1841 }
1842
1843 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1844 const struct ib_mad_send_wr_private *wr,
1845 const struct ib_mad_recv_wc *rwc )
1846 {
1847 struct ib_ah_attr attr;
1848 u8 send_resp, rcv_resp;
1849 union ib_gid sgid;
1850 struct ib_device *device = mad_agent_priv->agent.device;
1851 u8 port_num = mad_agent_priv->agent.port_num;
1852 u8 lmc;
1853
1854 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1855 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1856
1857 if (send_resp == rcv_resp)
1858 /* both requests, or both responses. GIDs different */
1859 return 0;
1860
1861 if (ib_query_ah(wr->send_buf.ah, &attr))
1862 /* Assume not equal, to avoid false positives. */
1863 return 0;
1864
1865 if (!!(attr.ah_flags & IB_AH_GRH) !=
1866 !!(rwc->wc->wc_flags & IB_WC_GRH))
1867 /* one has GID, other does not. Assume different */
1868 return 0;
1869
1870 if (!send_resp && rcv_resp) {
1871 /* is request/response. */
1872 if (!(attr.ah_flags & IB_AH_GRH)) {
1873 if (ib_get_cached_lmc(device, port_num, &lmc))
1874 return 0;
1875 return (!lmc || !((attr.src_path_bits ^
1876 rwc->wc->dlid_path_bits) &
1877 ((1 << lmc) - 1)));
1878 } else {
1879 if (ib_get_cached_gid(device, port_num,
1880 attr.grh.sgid_index, &sgid, NULL))
1881 return 0;
1882 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1883 16);
1884 }
1885 }
1886
1887 if (!(attr.ah_flags & IB_AH_GRH))
1888 return attr.dlid == rwc->wc->slid;
1889 else
1890 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1891 16);
1892 }
1893
1894 static inline int is_direct(u8 class)
1895 {
1896 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1897 }
1898
1899 struct ib_mad_send_wr_private*
1900 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1901 const struct ib_mad_recv_wc *wc)
1902 {
1903 struct ib_mad_send_wr_private *wr;
1904 const struct ib_mad_hdr *mad_hdr;
1905
1906 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1907
1908 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1909 if ((wr->tid == mad_hdr->tid) &&
1910 rcv_has_same_class(wr, wc) &&
1911 /*
1912 * Don't check GID for direct routed MADs.
1913 * These might have permissive LIDs.
1914 */
1915 (is_direct(mad_hdr->mgmt_class) ||
1916 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1917 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1918 }
1919
1920 /*
1921 * It's possible to receive the response before we've
1922 * been notified that the send has completed
1923 */
1924 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1925 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1926 wr->tid == mad_hdr->tid &&
1927 wr->timeout &&
1928 rcv_has_same_class(wr, wc) &&
1929 /*
1930 * Don't check GID for direct routed MADs.
1931 * These might have permissive LIDs.
1932 */
1933 (is_direct(mad_hdr->mgmt_class) ||
1934 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1935 /* Verify request has not been canceled */
1936 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1937 }
1938 return NULL;
1939 }
1940
1941 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1942 {
1943 mad_send_wr->timeout = 0;
1944 if (mad_send_wr->refcount == 1)
1945 list_move_tail(&mad_send_wr->agent_list,
1946 &mad_send_wr->mad_agent_priv->done_list);
1947 }
1948
1949 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1950 struct ib_mad_recv_wc *mad_recv_wc)
1951 {
1952 struct ib_mad_send_wr_private *mad_send_wr;
1953 struct ib_mad_send_wc mad_send_wc;
1954 unsigned long flags;
1955
1956 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1957 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1958 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1959 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1960 mad_recv_wc);
1961 if (!mad_recv_wc) {
1962 deref_mad_agent(mad_agent_priv);
1963 return;
1964 }
1965 }
1966
1967 /* Complete corresponding request */
1968 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1969 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1970 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1971 if (!mad_send_wr) {
1972 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1973 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1974 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1975 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1976 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1977 /* user rmpp is in effect
1978 * and this is an active RMPP MAD
1979 */
1980 mad_recv_wc->wc->wr_id = 0;
1981 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1982 mad_recv_wc);
1983 atomic_dec(&mad_agent_priv->refcount);
1984 } else {
1985 /* not user rmpp, revert to normal behavior and
1986 * drop the mad */
1987 ib_free_recv_mad(mad_recv_wc);
1988 deref_mad_agent(mad_agent_priv);
1989 return;
1990 }
1991 } else {
1992 ib_mark_mad_done(mad_send_wr);
1993 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1994
1995 /* Defined behavior is to complete response before request */
1996 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1997 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1998 mad_recv_wc);
1999 atomic_dec(&mad_agent_priv->refcount);
2000
2001 mad_send_wc.status = IB_WC_SUCCESS;
2002 mad_send_wc.vendor_err = 0;
2003 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2004 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2005 }
2006 } else {
2007 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2008 mad_recv_wc);
2009 deref_mad_agent(mad_agent_priv);
2010 }
2011 }
2012
2013 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2014 const struct ib_mad_qp_info *qp_info,
2015 const struct ib_wc *wc,
2016 int port_num,
2017 struct ib_mad_private *recv,
2018 struct ib_mad_private *response)
2019 {
2020 enum smi_forward_action retsmi;
2021 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2022
2023 if (smi_handle_dr_smp_recv(smp,
2024 rdma_cap_ib_switch(port_priv->device),
2025 port_num,
2026 port_priv->device->phys_port_cnt) ==
2027 IB_SMI_DISCARD)
2028 return IB_SMI_DISCARD;
2029
2030 retsmi = smi_check_forward_dr_smp(smp);
2031 if (retsmi == IB_SMI_LOCAL)
2032 return IB_SMI_HANDLE;
2033
2034 if (retsmi == IB_SMI_SEND) { /* don't forward */
2035 if (smi_handle_dr_smp_send(smp,
2036 rdma_cap_ib_switch(port_priv->device),
2037 port_num) == IB_SMI_DISCARD)
2038 return IB_SMI_DISCARD;
2039
2040 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2041 return IB_SMI_DISCARD;
2042 } else if (rdma_cap_ib_switch(port_priv->device)) {
2043 /* forward case for switches */
2044 memcpy(response, recv, mad_priv_size(response));
2045 response->header.recv_wc.wc = &response->header.wc;
2046 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2047 response->header.recv_wc.recv_buf.grh = &response->grh;
2048
2049 agent_send_response((const struct ib_mad_hdr *)response->mad,
2050 &response->grh, wc,
2051 port_priv->device,
2052 smi_get_fwd_port(smp),
2053 qp_info->qp->qp_num,
2054 response->mad_size,
2055 false);
2056
2057 return IB_SMI_DISCARD;
2058 }
2059 return IB_SMI_HANDLE;
2060 }
2061
2062 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2063 struct ib_mad_private *response,
2064 size_t *resp_len, bool opa)
2065 {
2066 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2067 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2068
2069 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2070 recv_hdr->method == IB_MGMT_METHOD_SET) {
2071 memcpy(response, recv, mad_priv_size(response));
2072 response->header.recv_wc.wc = &response->header.wc;
2073 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2074 response->header.recv_wc.recv_buf.grh = &response->grh;
2075 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2076 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2077 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2078 resp_hdr->status |= IB_SMP_DIRECTION;
2079
2080 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2081 if (recv_hdr->mgmt_class ==
2082 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2083 recv_hdr->mgmt_class ==
2084 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2085 *resp_len = opa_get_smp_header_size(
2086 (struct opa_smp *)recv->mad);
2087 else
2088 *resp_len = sizeof(struct ib_mad_hdr);
2089 }
2090
2091 return true;
2092 } else {
2093 return false;
2094 }
2095 }
2096
2097 static enum smi_action
2098 handle_opa_smi(struct ib_mad_port_private *port_priv,
2099 struct ib_mad_qp_info *qp_info,
2100 struct ib_wc *wc,
2101 int port_num,
2102 struct ib_mad_private *recv,
2103 struct ib_mad_private *response)
2104 {
2105 enum smi_forward_action retsmi;
2106 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2107
2108 if (opa_smi_handle_dr_smp_recv(smp,
2109 rdma_cap_ib_switch(port_priv->device),
2110 port_num,
2111 port_priv->device->phys_port_cnt) ==
2112 IB_SMI_DISCARD)
2113 return IB_SMI_DISCARD;
2114
2115 retsmi = opa_smi_check_forward_dr_smp(smp);
2116 if (retsmi == IB_SMI_LOCAL)
2117 return IB_SMI_HANDLE;
2118
2119 if (retsmi == IB_SMI_SEND) { /* don't forward */
2120 if (opa_smi_handle_dr_smp_send(smp,
2121 rdma_cap_ib_switch(port_priv->device),
2122 port_num) == IB_SMI_DISCARD)
2123 return IB_SMI_DISCARD;
2124
2125 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2126 IB_SMI_DISCARD)
2127 return IB_SMI_DISCARD;
2128
2129 } else if (rdma_cap_ib_switch(port_priv->device)) {
2130 /* forward case for switches */
2131 memcpy(response, recv, mad_priv_size(response));
2132 response->header.recv_wc.wc = &response->header.wc;
2133 response->header.recv_wc.recv_buf.opa_mad =
2134 (struct opa_mad *)response->mad;
2135 response->header.recv_wc.recv_buf.grh = &response->grh;
2136
2137 agent_send_response((const struct ib_mad_hdr *)response->mad,
2138 &response->grh, wc,
2139 port_priv->device,
2140 opa_smi_get_fwd_port(smp),
2141 qp_info->qp->qp_num,
2142 recv->header.wc.byte_len,
2143 true);
2144
2145 return IB_SMI_DISCARD;
2146 }
2147
2148 return IB_SMI_HANDLE;
2149 }
2150
2151 static enum smi_action
2152 handle_smi(struct ib_mad_port_private *port_priv,
2153 struct ib_mad_qp_info *qp_info,
2154 struct ib_wc *wc,
2155 int port_num,
2156 struct ib_mad_private *recv,
2157 struct ib_mad_private *response,
2158 bool opa)
2159 {
2160 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2161
2162 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2163 mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
2164 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2165 response);
2166
2167 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2168 }
2169
2170 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
2171 struct ib_wc *wc)
2172 {
2173 struct ib_mad_qp_info *qp_info;
2174 struct ib_mad_private_header *mad_priv_hdr;
2175 struct ib_mad_private *recv, *response = NULL;
2176 struct ib_mad_list_head *mad_list;
2177 struct ib_mad_agent_private *mad_agent;
2178 int port_num;
2179 int ret = IB_MAD_RESULT_SUCCESS;
2180 size_t mad_size;
2181 u16 resp_mad_pkey_index = 0;
2182 bool opa;
2183
2184 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2185 qp_info = mad_list->mad_queue->qp_info;
2186 dequeue_mad(mad_list);
2187
2188 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2189 qp_info->port_priv->port_num);
2190
2191 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2192 mad_list);
2193 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2194 ib_dma_unmap_single(port_priv->device,
2195 recv->header.mapping,
2196 mad_priv_dma_size(recv),
2197 DMA_FROM_DEVICE);
2198
2199 /* Setup MAD receive work completion from "normal" work completion */
2200 recv->header.wc = *wc;
2201 recv->header.recv_wc.wc = &recv->header.wc;
2202
2203 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2204 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2205 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2206 } else {
2207 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2208 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2209 }
2210
2211 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2212 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2213
2214 if (atomic_read(&qp_info->snoop_count))
2215 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2216
2217 /* Validate MAD */
2218 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2219 goto out;
2220
2221 mad_size = recv->mad_size;
2222 response = alloc_mad_private(mad_size, GFP_KERNEL);
2223 if (!response) {
2224 dev_err(&port_priv->device->dev,
2225 "ib_mad_recv_done_handler no memory for response buffer\n");
2226 goto out;
2227 }
2228
2229 if (rdma_cap_ib_switch(port_priv->device))
2230 port_num = wc->port_num;
2231 else
2232 port_num = port_priv->port_num;
2233
2234 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2235 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2236 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2237 response, opa)
2238 == IB_SMI_DISCARD)
2239 goto out;
2240 }
2241
2242 /* Give driver "right of first refusal" on incoming MAD */
2243 if (port_priv->device->process_mad) {
2244 ret = port_priv->device->process_mad(port_priv->device, 0,
2245 port_priv->port_num,
2246 wc, &recv->grh,
2247 (const struct ib_mad_hdr *)recv->mad,
2248 recv->mad_size,
2249 (struct ib_mad_hdr *)response->mad,
2250 &mad_size, &resp_mad_pkey_index);
2251
2252 if (opa)
2253 wc->pkey_index = resp_mad_pkey_index;
2254
2255 if (ret & IB_MAD_RESULT_SUCCESS) {
2256 if (ret & IB_MAD_RESULT_CONSUMED)
2257 goto out;
2258 if (ret & IB_MAD_RESULT_REPLY) {
2259 agent_send_response((const struct ib_mad_hdr *)response->mad,
2260 &recv->grh, wc,
2261 port_priv->device,
2262 port_num,
2263 qp_info->qp->qp_num,
2264 mad_size, opa);
2265 goto out;
2266 }
2267 }
2268 }
2269
2270 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2271 if (mad_agent) {
2272 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2273 /*
2274 * recv is freed up in error cases in ib_mad_complete_recv
2275 * or via recv_handler in ib_mad_complete_recv()
2276 */
2277 recv = NULL;
2278 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2279 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2280 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2281 port_priv->device, port_num,
2282 qp_info->qp->qp_num, mad_size, opa);
2283 }
2284
2285 out:
2286 /* Post another receive request for this QP */
2287 if (response) {
2288 ib_mad_post_receive_mads(qp_info, response);
2289 kfree(recv);
2290 } else
2291 ib_mad_post_receive_mads(qp_info, recv);
2292 }
2293
2294 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2295 {
2296 struct ib_mad_send_wr_private *mad_send_wr;
2297 unsigned long delay;
2298
2299 if (list_empty(&mad_agent_priv->wait_list)) {
2300 cancel_delayed_work(&mad_agent_priv->timed_work);
2301 } else {
2302 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2303 struct ib_mad_send_wr_private,
2304 agent_list);
2305
2306 if (time_after(mad_agent_priv->timeout,
2307 mad_send_wr->timeout)) {
2308 mad_agent_priv->timeout = mad_send_wr->timeout;
2309 delay = mad_send_wr->timeout - jiffies;
2310 if ((long)delay <= 0)
2311 delay = 1;
2312 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2313 &mad_agent_priv->timed_work, delay);
2314 }
2315 }
2316 }
2317
2318 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2319 {
2320 struct ib_mad_agent_private *mad_agent_priv;
2321 struct ib_mad_send_wr_private *temp_mad_send_wr;
2322 struct list_head *list_item;
2323 unsigned long delay;
2324
2325 mad_agent_priv = mad_send_wr->mad_agent_priv;
2326 list_del(&mad_send_wr->agent_list);
2327
2328 delay = mad_send_wr->timeout;
2329 mad_send_wr->timeout += jiffies;
2330
2331 if (delay) {
2332 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2333 temp_mad_send_wr = list_entry(list_item,
2334 struct ib_mad_send_wr_private,
2335 agent_list);
2336 if (time_after(mad_send_wr->timeout,
2337 temp_mad_send_wr->timeout))
2338 break;
2339 }
2340 }
2341 else
2342 list_item = &mad_agent_priv->wait_list;
2343 list_add(&mad_send_wr->agent_list, list_item);
2344
2345 /* Reschedule a work item if we have a shorter timeout */
2346 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2347 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2348 &mad_agent_priv->timed_work, delay);
2349 }
2350
2351 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2352 int timeout_ms)
2353 {
2354 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2355 wait_for_response(mad_send_wr);
2356 }
2357
2358 /*
2359 * Process a send work completion
2360 */
2361 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2362 struct ib_mad_send_wc *mad_send_wc)
2363 {
2364 struct ib_mad_agent_private *mad_agent_priv;
2365 unsigned long flags;
2366 int ret;
2367
2368 mad_agent_priv = mad_send_wr->mad_agent_priv;
2369 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2370 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2371 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2372 if (ret == IB_RMPP_RESULT_CONSUMED)
2373 goto done;
2374 } else
2375 ret = IB_RMPP_RESULT_UNHANDLED;
2376
2377 if (mad_send_wc->status != IB_WC_SUCCESS &&
2378 mad_send_wr->status == IB_WC_SUCCESS) {
2379 mad_send_wr->status = mad_send_wc->status;
2380 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2381 }
2382
2383 if (--mad_send_wr->refcount > 0) {
2384 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2385 mad_send_wr->status == IB_WC_SUCCESS) {
2386 wait_for_response(mad_send_wr);
2387 }
2388 goto done;
2389 }
2390
2391 /* Remove send from MAD agent and notify client of completion */
2392 list_del(&mad_send_wr->agent_list);
2393 adjust_timeout(mad_agent_priv);
2394 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2395
2396 if (mad_send_wr->status != IB_WC_SUCCESS )
2397 mad_send_wc->status = mad_send_wr->status;
2398 if (ret == IB_RMPP_RESULT_INTERNAL)
2399 ib_rmpp_send_handler(mad_send_wc);
2400 else
2401 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2402 mad_send_wc);
2403
2404 /* Release reference on agent taken when sending */
2405 deref_mad_agent(mad_agent_priv);
2406 return;
2407 done:
2408 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2409 }
2410
2411 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2412 struct ib_wc *wc)
2413 {
2414 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2415 struct ib_mad_list_head *mad_list;
2416 struct ib_mad_qp_info *qp_info;
2417 struct ib_mad_queue *send_queue;
2418 struct ib_send_wr *bad_send_wr;
2419 struct ib_mad_send_wc mad_send_wc;
2420 unsigned long flags;
2421 int ret;
2422
2423 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2424 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2425 mad_list);
2426 send_queue = mad_list->mad_queue;
2427 qp_info = send_queue->qp_info;
2428
2429 retry:
2430 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2431 mad_send_wr->header_mapping,
2432 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2433 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2434 mad_send_wr->payload_mapping,
2435 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2436 queued_send_wr = NULL;
2437 spin_lock_irqsave(&send_queue->lock, flags);
2438 list_del(&mad_list->list);
2439
2440 /* Move queued send to the send queue */
2441 if (send_queue->count-- > send_queue->max_active) {
2442 mad_list = container_of(qp_info->overflow_list.next,
2443 struct ib_mad_list_head, list);
2444 queued_send_wr = container_of(mad_list,
2445 struct ib_mad_send_wr_private,
2446 mad_list);
2447 list_move_tail(&mad_list->list, &send_queue->list);
2448 }
2449 spin_unlock_irqrestore(&send_queue->lock, flags);
2450
2451 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2452 mad_send_wc.status = wc->status;
2453 mad_send_wc.vendor_err = wc->vendor_err;
2454 if (atomic_read(&qp_info->snoop_count))
2455 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2456 IB_MAD_SNOOP_SEND_COMPLETIONS);
2457 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2458
2459 if (queued_send_wr) {
2460 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2461 &bad_send_wr);
2462 if (ret) {
2463 dev_err(&port_priv->device->dev,
2464 "ib_post_send failed: %d\n", ret);
2465 mad_send_wr = queued_send_wr;
2466 wc->status = IB_WC_LOC_QP_OP_ERR;
2467 goto retry;
2468 }
2469 }
2470 }
2471
2472 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2473 {
2474 struct ib_mad_send_wr_private *mad_send_wr;
2475 struct ib_mad_list_head *mad_list;
2476 unsigned long flags;
2477
2478 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2479 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2480 mad_send_wr = container_of(mad_list,
2481 struct ib_mad_send_wr_private,
2482 mad_list);
2483 mad_send_wr->retry = 1;
2484 }
2485 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2486 }
2487
2488 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2489 struct ib_wc *wc)
2490 {
2491 struct ib_mad_list_head *mad_list;
2492 struct ib_mad_qp_info *qp_info;
2493 struct ib_mad_send_wr_private *mad_send_wr;
2494 int ret;
2495
2496 /* Determine if failure was a send or receive */
2497 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2498 qp_info = mad_list->mad_queue->qp_info;
2499 if (mad_list->mad_queue == &qp_info->recv_queue)
2500 /*
2501 * Receive errors indicate that the QP has entered the error
2502 * state - error handling/shutdown code will cleanup
2503 */
2504 return;
2505
2506 /*
2507 * Send errors will transition the QP to SQE - move
2508 * QP to RTS and repost flushed work requests
2509 */
2510 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2511 mad_list);
2512 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2513 if (mad_send_wr->retry) {
2514 /* Repost send */
2515 struct ib_send_wr *bad_send_wr;
2516
2517 mad_send_wr->retry = 0;
2518 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2519 &bad_send_wr);
2520 if (ret)
2521 ib_mad_send_done_handler(port_priv, wc);
2522 } else
2523 ib_mad_send_done_handler(port_priv, wc);
2524 } else {
2525 struct ib_qp_attr *attr;
2526
2527 /* Transition QP to RTS and fail offending send */
2528 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2529 if (attr) {
2530 attr->qp_state = IB_QPS_RTS;
2531 attr->cur_qp_state = IB_QPS_SQE;
2532 ret = ib_modify_qp(qp_info->qp, attr,
2533 IB_QP_STATE | IB_QP_CUR_STATE);
2534 kfree(attr);
2535 if (ret)
2536 dev_err(&port_priv->device->dev,
2537 "mad_error_handler - ib_modify_qp to RTS : %d\n",
2538 ret);
2539 else
2540 mark_sends_for_retry(qp_info);
2541 }
2542 ib_mad_send_done_handler(port_priv, wc);
2543 }
2544 }
2545
2546 /*
2547 * IB MAD completion callback
2548 */
2549 static void ib_mad_completion_handler(struct work_struct *work)
2550 {
2551 struct ib_mad_port_private *port_priv;
2552 struct ib_wc wc;
2553
2554 port_priv = container_of(work, struct ib_mad_port_private, work);
2555 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2556
2557 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2558 if (wc.status == IB_WC_SUCCESS) {
2559 switch (wc.opcode) {
2560 case IB_WC_SEND:
2561 ib_mad_send_done_handler(port_priv, &wc);
2562 break;
2563 case IB_WC_RECV:
2564 ib_mad_recv_done_handler(port_priv, &wc);
2565 break;
2566 default:
2567 BUG_ON(1);
2568 break;
2569 }
2570 } else
2571 mad_error_handler(port_priv, &wc);
2572 }
2573 }
2574
2575 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2576 {
2577 unsigned long flags;
2578 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2579 struct ib_mad_send_wc mad_send_wc;
2580 struct list_head cancel_list;
2581
2582 INIT_LIST_HEAD(&cancel_list);
2583
2584 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2585 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2586 &mad_agent_priv->send_list, agent_list) {
2587 if (mad_send_wr->status == IB_WC_SUCCESS) {
2588 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2589 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2590 }
2591 }
2592
2593 /* Empty wait list to prevent receives from finding a request */
2594 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2595 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2596
2597 /* Report all cancelled requests */
2598 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2599 mad_send_wc.vendor_err = 0;
2600
2601 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2602 &cancel_list, agent_list) {
2603 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2604 list_del(&mad_send_wr->agent_list);
2605 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2606 &mad_send_wc);
2607 atomic_dec(&mad_agent_priv->refcount);
2608 }
2609 }
2610
2611 static struct ib_mad_send_wr_private*
2612 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2613 struct ib_mad_send_buf *send_buf)
2614 {
2615 struct ib_mad_send_wr_private *mad_send_wr;
2616
2617 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2618 agent_list) {
2619 if (&mad_send_wr->send_buf == send_buf)
2620 return mad_send_wr;
2621 }
2622
2623 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2624 agent_list) {
2625 if (is_rmpp_data_mad(mad_agent_priv,
2626 mad_send_wr->send_buf.mad) &&
2627 &mad_send_wr->send_buf == send_buf)
2628 return mad_send_wr;
2629 }
2630 return NULL;
2631 }
2632
2633 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2634 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2635 {
2636 struct ib_mad_agent_private *mad_agent_priv;
2637 struct ib_mad_send_wr_private *mad_send_wr;
2638 unsigned long flags;
2639 int active;
2640
2641 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2642 agent);
2643 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2644 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2645 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2646 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2647 return -EINVAL;
2648 }
2649
2650 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2651 if (!timeout_ms) {
2652 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2653 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2654 }
2655
2656 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2657 if (active)
2658 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2659 else
2660 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2661
2662 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2663 return 0;
2664 }
2665 EXPORT_SYMBOL(ib_modify_mad);
2666
2667 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2668 struct ib_mad_send_buf *send_buf)
2669 {
2670 ib_modify_mad(mad_agent, send_buf, 0);
2671 }
2672 EXPORT_SYMBOL(ib_cancel_mad);
2673
2674 static void local_completions(struct work_struct *work)
2675 {
2676 struct ib_mad_agent_private *mad_agent_priv;
2677 struct ib_mad_local_private *local;
2678 struct ib_mad_agent_private *recv_mad_agent;
2679 unsigned long flags;
2680 int free_mad;
2681 struct ib_wc wc;
2682 struct ib_mad_send_wc mad_send_wc;
2683 bool opa;
2684
2685 mad_agent_priv =
2686 container_of(work, struct ib_mad_agent_private, local_work);
2687
2688 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2689 mad_agent_priv->qp_info->port_priv->port_num);
2690
2691 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2692 while (!list_empty(&mad_agent_priv->local_list)) {
2693 local = list_entry(mad_agent_priv->local_list.next,
2694 struct ib_mad_local_private,
2695 completion_list);
2696 list_del(&local->completion_list);
2697 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2698 free_mad = 0;
2699 if (local->mad_priv) {
2700 u8 base_version;
2701 recv_mad_agent = local->recv_mad_agent;
2702 if (!recv_mad_agent) {
2703 dev_err(&mad_agent_priv->agent.device->dev,
2704 "No receive MAD agent for local completion\n");
2705 free_mad = 1;
2706 goto local_send_completion;
2707 }
2708
2709 /*
2710 * Defined behavior is to complete response
2711 * before request
2712 */
2713 build_smp_wc(recv_mad_agent->agent.qp,
2714 (unsigned long) local->mad_send_wr,
2715 be16_to_cpu(IB_LID_PERMISSIVE),
2716 local->mad_send_wr->send_wr.pkey_index,
2717 recv_mad_agent->agent.port_num, &wc);
2718
2719 local->mad_priv->header.recv_wc.wc = &wc;
2720
2721 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2722 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2723 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2724 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2725 } else {
2726 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2727 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2728 }
2729
2730 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2731 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2732 &local->mad_priv->header.recv_wc.rmpp_list);
2733 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2734 local->mad_priv->header.recv_wc.recv_buf.mad =
2735 (struct ib_mad *)local->mad_priv->mad;
2736 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2737 snoop_recv(recv_mad_agent->qp_info,
2738 &local->mad_priv->header.recv_wc,
2739 IB_MAD_SNOOP_RECVS);
2740 recv_mad_agent->agent.recv_handler(
2741 &recv_mad_agent->agent,
2742 &local->mad_priv->header.recv_wc);
2743 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2744 atomic_dec(&recv_mad_agent->refcount);
2745 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2746 }
2747
2748 local_send_completion:
2749 /* Complete send */
2750 mad_send_wc.status = IB_WC_SUCCESS;
2751 mad_send_wc.vendor_err = 0;
2752 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2753 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2754 snoop_send(mad_agent_priv->qp_info,
2755 &local->mad_send_wr->send_buf,
2756 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2757 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2758 &mad_send_wc);
2759
2760 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2761 atomic_dec(&mad_agent_priv->refcount);
2762 if (free_mad)
2763 kfree(local->mad_priv);
2764 kfree(local);
2765 }
2766 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2767 }
2768
2769 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2770 {
2771 int ret;
2772
2773 if (!mad_send_wr->retries_left)
2774 return -ETIMEDOUT;
2775
2776 mad_send_wr->retries_left--;
2777 mad_send_wr->send_buf.retries++;
2778
2779 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2780
2781 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2782 ret = ib_retry_rmpp(mad_send_wr);
2783 switch (ret) {
2784 case IB_RMPP_RESULT_UNHANDLED:
2785 ret = ib_send_mad(mad_send_wr);
2786 break;
2787 case IB_RMPP_RESULT_CONSUMED:
2788 ret = 0;
2789 break;
2790 default:
2791 ret = -ECOMM;
2792 break;
2793 }
2794 } else
2795 ret = ib_send_mad(mad_send_wr);
2796
2797 if (!ret) {
2798 mad_send_wr->refcount++;
2799 list_add_tail(&mad_send_wr->agent_list,
2800 &mad_send_wr->mad_agent_priv->send_list);
2801 }
2802 return ret;
2803 }
2804
2805 static void timeout_sends(struct work_struct *work)
2806 {
2807 struct ib_mad_agent_private *mad_agent_priv;
2808 struct ib_mad_send_wr_private *mad_send_wr;
2809 struct ib_mad_send_wc mad_send_wc;
2810 unsigned long flags, delay;
2811
2812 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2813 timed_work.work);
2814 mad_send_wc.vendor_err = 0;
2815
2816 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2817 while (!list_empty(&mad_agent_priv->wait_list)) {
2818 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2819 struct ib_mad_send_wr_private,
2820 agent_list);
2821
2822 if (time_after(mad_send_wr->timeout, jiffies)) {
2823 delay = mad_send_wr->timeout - jiffies;
2824 if ((long)delay <= 0)
2825 delay = 1;
2826 queue_delayed_work(mad_agent_priv->qp_info->
2827 port_priv->wq,
2828 &mad_agent_priv->timed_work, delay);
2829 break;
2830 }
2831
2832 list_del(&mad_send_wr->agent_list);
2833 if (mad_send_wr->status == IB_WC_SUCCESS &&
2834 !retry_send(mad_send_wr))
2835 continue;
2836
2837 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2838
2839 if (mad_send_wr->status == IB_WC_SUCCESS)
2840 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2841 else
2842 mad_send_wc.status = mad_send_wr->status;
2843 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2844 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2845 &mad_send_wc);
2846
2847 atomic_dec(&mad_agent_priv->refcount);
2848 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2849 }
2850 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2851 }
2852
2853 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2854 {
2855 struct ib_mad_port_private *port_priv = cq->cq_context;
2856 unsigned long flags;
2857
2858 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2859 if (!list_empty(&port_priv->port_list))
2860 queue_work(port_priv->wq, &port_priv->work);
2861 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2862 }
2863
2864 /*
2865 * Allocate receive MADs and post receive WRs for them
2866 */
2867 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2868 struct ib_mad_private *mad)
2869 {
2870 unsigned long flags;
2871 int post, ret;
2872 struct ib_mad_private *mad_priv;
2873 struct ib_sge sg_list;
2874 struct ib_recv_wr recv_wr, *bad_recv_wr;
2875 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2876
2877 /* Initialize common scatter list fields */
2878 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2879
2880 /* Initialize common receive WR fields */
2881 recv_wr.next = NULL;
2882 recv_wr.sg_list = &sg_list;
2883 recv_wr.num_sge = 1;
2884
2885 do {
2886 /* Allocate and map receive buffer */
2887 if (mad) {
2888 mad_priv = mad;
2889 mad = NULL;
2890 } else {
2891 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2892 GFP_ATOMIC);
2893 if (!mad_priv) {
2894 dev_err(&qp_info->port_priv->device->dev,
2895 "No memory for receive buffer\n");
2896 ret = -ENOMEM;
2897 break;
2898 }
2899 }
2900 sg_list.length = mad_priv_dma_size(mad_priv);
2901 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2902 &mad_priv->grh,
2903 mad_priv_dma_size(mad_priv),
2904 DMA_FROM_DEVICE);
2905 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2906 sg_list.addr))) {
2907 ret = -ENOMEM;
2908 break;
2909 }
2910 mad_priv->header.mapping = sg_list.addr;
2911 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2912 mad_priv->header.mad_list.mad_queue = recv_queue;
2913
2914 /* Post receive WR */
2915 spin_lock_irqsave(&recv_queue->lock, flags);
2916 post = (++recv_queue->count < recv_queue->max_active);
2917 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2918 spin_unlock_irqrestore(&recv_queue->lock, flags);
2919 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2920 if (ret) {
2921 spin_lock_irqsave(&recv_queue->lock, flags);
2922 list_del(&mad_priv->header.mad_list.list);
2923 recv_queue->count--;
2924 spin_unlock_irqrestore(&recv_queue->lock, flags);
2925 ib_dma_unmap_single(qp_info->port_priv->device,
2926 mad_priv->header.mapping,
2927 mad_priv_dma_size(mad_priv),
2928 DMA_FROM_DEVICE);
2929 kfree(mad_priv);
2930 dev_err(&qp_info->port_priv->device->dev,
2931 "ib_post_recv failed: %d\n", ret);
2932 break;
2933 }
2934 } while (post);
2935
2936 return ret;
2937 }
2938
2939 /*
2940 * Return all the posted receive MADs
2941 */
2942 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2943 {
2944 struct ib_mad_private_header *mad_priv_hdr;
2945 struct ib_mad_private *recv;
2946 struct ib_mad_list_head *mad_list;
2947
2948 if (!qp_info->qp)
2949 return;
2950
2951 while (!list_empty(&qp_info->recv_queue.list)) {
2952
2953 mad_list = list_entry(qp_info->recv_queue.list.next,
2954 struct ib_mad_list_head, list);
2955 mad_priv_hdr = container_of(mad_list,
2956 struct ib_mad_private_header,
2957 mad_list);
2958 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2959 header);
2960
2961 /* Remove from posted receive MAD list */
2962 list_del(&mad_list->list);
2963
2964 ib_dma_unmap_single(qp_info->port_priv->device,
2965 recv->header.mapping,
2966 mad_priv_dma_size(recv),
2967 DMA_FROM_DEVICE);
2968 kfree(recv);
2969 }
2970
2971 qp_info->recv_queue.count = 0;
2972 }
2973
2974 /*
2975 * Start the port
2976 */
2977 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2978 {
2979 int ret, i;
2980 struct ib_qp_attr *attr;
2981 struct ib_qp *qp;
2982 u16 pkey_index;
2983
2984 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2985 if (!attr) {
2986 dev_err(&port_priv->device->dev,
2987 "Couldn't kmalloc ib_qp_attr\n");
2988 return -ENOMEM;
2989 }
2990
2991 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2992 IB_DEFAULT_PKEY_FULL, &pkey_index);
2993 if (ret)
2994 pkey_index = 0;
2995
2996 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2997 qp = port_priv->qp_info[i].qp;
2998 if (!qp)
2999 continue;
3000
3001 /*
3002 * PKey index for QP1 is irrelevant but
3003 * one is needed for the Reset to Init transition
3004 */
3005 attr->qp_state = IB_QPS_INIT;
3006 attr->pkey_index = pkey_index;
3007 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3008 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3009 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3010 if (ret) {
3011 dev_err(&port_priv->device->dev,
3012 "Couldn't change QP%d state to INIT: %d\n",
3013 i, ret);
3014 goto out;
3015 }
3016
3017 attr->qp_state = IB_QPS_RTR;
3018 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3019 if (ret) {
3020 dev_err(&port_priv->device->dev,
3021 "Couldn't change QP%d state to RTR: %d\n",
3022 i, ret);
3023 goto out;
3024 }
3025
3026 attr->qp_state = IB_QPS_RTS;
3027 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3028 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3029 if (ret) {
3030 dev_err(&port_priv->device->dev,
3031 "Couldn't change QP%d state to RTS: %d\n",
3032 i, ret);
3033 goto out;
3034 }
3035 }
3036
3037 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3038 if (ret) {
3039 dev_err(&port_priv->device->dev,
3040 "Failed to request completion notification: %d\n",
3041 ret);
3042 goto out;
3043 }
3044
3045 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3046 if (!port_priv->qp_info[i].qp)
3047 continue;
3048
3049 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3050 if (ret) {
3051 dev_err(&port_priv->device->dev,
3052 "Couldn't post receive WRs\n");
3053 goto out;
3054 }
3055 }
3056 out:
3057 kfree(attr);
3058 return ret;
3059 }
3060
3061 static void qp_event_handler(struct ib_event *event, void *qp_context)
3062 {
3063 struct ib_mad_qp_info *qp_info = qp_context;
3064
3065 /* It's worse than that! He's dead, Jim! */
3066 dev_err(&qp_info->port_priv->device->dev,
3067 "Fatal error (%d) on MAD QP (%d)\n",
3068 event->event, qp_info->qp->qp_num);
3069 }
3070
3071 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3072 struct ib_mad_queue *mad_queue)
3073 {
3074 mad_queue->qp_info = qp_info;
3075 mad_queue->count = 0;
3076 spin_lock_init(&mad_queue->lock);
3077 INIT_LIST_HEAD(&mad_queue->list);
3078 }
3079
3080 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3081 struct ib_mad_qp_info *qp_info)
3082 {
3083 qp_info->port_priv = port_priv;
3084 init_mad_queue(qp_info, &qp_info->send_queue);
3085 init_mad_queue(qp_info, &qp_info->recv_queue);
3086 INIT_LIST_HEAD(&qp_info->overflow_list);
3087 spin_lock_init(&qp_info->snoop_lock);
3088 qp_info->snoop_table = NULL;
3089 qp_info->snoop_table_size = 0;
3090 atomic_set(&qp_info->snoop_count, 0);
3091 }
3092
3093 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3094 enum ib_qp_type qp_type)
3095 {
3096 struct ib_qp_init_attr qp_init_attr;
3097 int ret;
3098
3099 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3100 qp_init_attr.send_cq = qp_info->port_priv->cq;
3101 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3102 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3103 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3104 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3105 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3106 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3107 qp_init_attr.qp_type = qp_type;
3108 qp_init_attr.port_num = qp_info->port_priv->port_num;
3109 qp_init_attr.qp_context = qp_info;
3110 qp_init_attr.event_handler = qp_event_handler;
3111 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3112 if (IS_ERR(qp_info->qp)) {
3113 dev_err(&qp_info->port_priv->device->dev,
3114 "Couldn't create ib_mad QP%d\n",
3115 get_spl_qp_index(qp_type));
3116 ret = PTR_ERR(qp_info->qp);
3117 goto error;
3118 }
3119 /* Use minimum queue sizes unless the CQ is resized */
3120 qp_info->send_queue.max_active = mad_sendq_size;
3121 qp_info->recv_queue.max_active = mad_recvq_size;
3122 return 0;
3123
3124 error:
3125 return ret;
3126 }
3127
3128 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3129 {
3130 if (!qp_info->qp)
3131 return;
3132
3133 ib_destroy_qp(qp_info->qp);
3134 kfree(qp_info->snoop_table);
3135 }
3136
3137 /*
3138 * Open the port
3139 * Create the QP, PD, MR, and CQ if needed
3140 */
3141 static int ib_mad_port_open(struct ib_device *device,
3142 int port_num)
3143 {
3144 int ret, cq_size;
3145 struct ib_mad_port_private *port_priv;
3146 unsigned long flags;
3147 char name[sizeof "ib_mad123"];
3148 int has_smi;
3149 struct ib_cq_init_attr cq_attr = {};
3150
3151 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3152 return -EFAULT;
3153
3154 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3155 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3156 return -EFAULT;
3157
3158 /* Create new device info */
3159 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3160 if (!port_priv) {
3161 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
3162 return -ENOMEM;
3163 }
3164
3165 port_priv->device = device;
3166 port_priv->port_num = port_num;
3167 spin_lock_init(&port_priv->reg_lock);
3168 INIT_LIST_HEAD(&port_priv->agent_list);
3169 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3170 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3171
3172 cq_size = mad_sendq_size + mad_recvq_size;
3173 has_smi = rdma_cap_ib_smi(device, port_num);
3174 if (has_smi)
3175 cq_size *= 2;
3176
3177 cq_attr.cqe = cq_size;
3178 port_priv->cq = ib_create_cq(port_priv->device,
3179 ib_mad_thread_completion_handler,
3180 NULL, port_priv, &cq_attr);
3181 if (IS_ERR(port_priv->cq)) {
3182 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3183 ret = PTR_ERR(port_priv->cq);
3184 goto error3;
3185 }
3186
3187 port_priv->pd = ib_alloc_pd(device);
3188 if (IS_ERR(port_priv->pd)) {
3189 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3190 ret = PTR_ERR(port_priv->pd);
3191 goto error4;
3192 }
3193
3194 if (has_smi) {
3195 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3196 if (ret)
3197 goto error6;
3198 }
3199 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3200 if (ret)
3201 goto error7;
3202
3203 snprintf(name, sizeof name, "ib_mad%d", port_num);
3204 port_priv->wq = create_singlethread_workqueue(name);
3205 if (!port_priv->wq) {
3206 ret = -ENOMEM;
3207 goto error8;
3208 }
3209 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
3210
3211 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3212 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3213 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3214
3215 ret = ib_mad_port_start(port_priv);
3216 if (ret) {
3217 dev_err(&device->dev, "Couldn't start port\n");
3218 goto error9;
3219 }
3220
3221 return 0;
3222
3223 error9:
3224 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3225 list_del_init(&port_priv->port_list);
3226 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3227
3228 destroy_workqueue(port_priv->wq);
3229 error8:
3230 destroy_mad_qp(&port_priv->qp_info[1]);
3231 error7:
3232 destroy_mad_qp(&port_priv->qp_info[0]);
3233 error6:
3234 ib_dealloc_pd(port_priv->pd);
3235 error4:
3236 ib_destroy_cq(port_priv->cq);
3237 cleanup_recv_queue(&port_priv->qp_info[1]);
3238 cleanup_recv_queue(&port_priv->qp_info[0]);
3239 error3:
3240 kfree(port_priv);
3241
3242 return ret;
3243 }
3244
3245 /*
3246 * Close the port
3247 * If there are no classes using the port, free the port
3248 * resources (CQ, MR, PD, QP) and remove the port's info structure
3249 */
3250 static int ib_mad_port_close(struct ib_device *device, int port_num)
3251 {
3252 struct ib_mad_port_private *port_priv;
3253 unsigned long flags;
3254
3255 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3256 port_priv = __ib_get_mad_port(device, port_num);
3257 if (port_priv == NULL) {
3258 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3259 dev_err(&device->dev, "Port %d not found\n", port_num);
3260 return -ENODEV;
3261 }
3262 list_del_init(&port_priv->port_list);
3263 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3264
3265 destroy_workqueue(port_priv->wq);
3266 destroy_mad_qp(&port_priv->qp_info[1]);
3267 destroy_mad_qp(&port_priv->qp_info[0]);
3268 ib_dealloc_pd(port_priv->pd);
3269 ib_destroy_cq(port_priv->cq);
3270 cleanup_recv_queue(&port_priv->qp_info[1]);
3271 cleanup_recv_queue(&port_priv->qp_info[0]);
3272 /* XXX: Handle deallocation of MAD registration tables */
3273
3274 kfree(port_priv);
3275
3276 return 0;
3277 }
3278
3279 static void ib_mad_init_device(struct ib_device *device)
3280 {
3281 int start, i;
3282
3283 start = rdma_start_port(device);
3284
3285 for (i = start; i <= rdma_end_port(device); i++) {
3286 if (!rdma_cap_ib_mad(device, i))
3287 continue;
3288
3289 if (ib_mad_port_open(device, i)) {
3290 dev_err(&device->dev, "Couldn't open port %d\n", i);
3291 goto error;
3292 }
3293 if (ib_agent_port_open(device, i)) {
3294 dev_err(&device->dev,
3295 "Couldn't open port %d for agents\n", i);
3296 goto error_agent;
3297 }
3298 }
3299 return;
3300
3301 error_agent:
3302 if (ib_mad_port_close(device, i))
3303 dev_err(&device->dev, "Couldn't close port %d\n", i);
3304
3305 error:
3306 while (--i >= start) {
3307 if (!rdma_cap_ib_mad(device, i))
3308 continue;
3309
3310 if (ib_agent_port_close(device, i))
3311 dev_err(&device->dev,
3312 "Couldn't close port %d for agents\n", i);
3313 if (ib_mad_port_close(device, i))
3314 dev_err(&device->dev, "Couldn't close port %d\n", i);
3315 }
3316 }
3317
3318 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3319 {
3320 int i;
3321
3322 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3323 if (!rdma_cap_ib_mad(device, i))
3324 continue;
3325
3326 if (ib_agent_port_close(device, i))
3327 dev_err(&device->dev,
3328 "Couldn't close port %d for agents\n", i);
3329 if (ib_mad_port_close(device, i))
3330 dev_err(&device->dev, "Couldn't close port %d\n", i);
3331 }
3332 }
3333
3334 static struct ib_client mad_client = {
3335 .name = "mad",
3336 .add = ib_mad_init_device,
3337 .remove = ib_mad_remove_device
3338 };
3339
3340 static int __init ib_mad_init_module(void)
3341 {
3342 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3343 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3344
3345 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3346 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3347
3348 INIT_LIST_HEAD(&ib_mad_port_list);
3349
3350 if (ib_register_client(&mad_client)) {
3351 pr_err("Couldn't register ib_mad client\n");
3352 return -EINVAL;
3353 }
3354
3355 return 0;
3356 }
3357
3358 static void __exit ib_mad_cleanup_module(void)
3359 {
3360 ib_unregister_client(&mad_client);
3361 }
3362
3363 module_init(ib_mad_init_module);
3364 module_exit(ib_mad_cleanup_module);
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