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