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Linux 4.2.1
[linux/fpc-iii.git] / drivers / infiniband / core / mad.c
blob786fc51bf04b22b0d9b0fc371f3fdb25ec4c811b
1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 * Copyright (c) 2014 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 *
36 */
37
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40 #include <linux/dma-mapping.h>
41 #include <linux/slab.h>
42 #include <linux/module.h>
43 #include <rdma/ib_cache.h>
44
45 #include "mad_priv.h"
46 #include "mad_rmpp.h"
47 #include "smi.h"
48 #include "opa_smi.h"
49 #include "agent.h"
50
51 MODULE_LICENSE("Dual BSD/GPL");
52 MODULE_DESCRIPTION("kernel IB MAD API");
53 MODULE_AUTHOR("Hal Rosenstock");
54 MODULE_AUTHOR("Sean Hefty");
55
56 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
57 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
58
59 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
61 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
63
64 static struct list_head ib_mad_port_list;
65 static u32 ib_mad_client_id = 0;
66
67 /* Port list lock */
68 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
69
70 /* Forward declarations */
71 static int method_in_use(struct ib_mad_mgmt_method_table **method,
72 struct ib_mad_reg_req *mad_reg_req);
73 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
74 static struct ib_mad_agent_private *find_mad_agent(
75 struct ib_mad_port_private *port_priv,
76 const struct ib_mad_hdr *mad);
77 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
78 struct ib_mad_private *mad);
79 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
80 static void timeout_sends(struct work_struct *work);
81 static void local_completions(struct work_struct *work);
82 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv,
84 u8 mgmt_class);
85 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
86 struct ib_mad_agent_private *agent_priv);
87
88 /*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92 static inline struct ib_mad_port_private *
93 __ib_get_mad_port(struct ib_device *device, int port_num)
94 {
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102 }
103
104 /*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108 static inline struct ib_mad_port_private *
109 ib_get_mad_port(struct ib_device *device, int port_num)
110 {
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119 }
120
121 static inline u8 convert_mgmt_class(u8 mgmt_class)
122 {
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126 }
127
128 static int get_spl_qp_index(enum ib_qp_type qp_type)
129 {
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139 }
140
141 static int vendor_class_index(u8 mgmt_class)
142 {
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144 }
145
146 static int is_vendor_class(u8 mgmt_class)
147 {
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152 }
153
154 static int is_vendor_oui(char *oui)
155 {
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159 }
160
161 static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164 {
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180 }
181
182 int ib_response_mad(const struct ib_mad_hdr *hdr)
183 {
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188 }
189 EXPORT_SYMBOL(ib_response_mad);
190
191 /*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203 {
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
321 ret = ERR_PTR(-ENODEV);
322 goto error1;
323 }
324
325 /* Verify the QP requested is supported. For example, Ethernet devices
326 * will not have QP0 */
327 if (!port_priv->qp_info[qpn].qp) {
328 dev_notice(&device->dev,
329 "ib_register_mad_agent: QP %d not supported\n", qpn);
330 ret = ERR_PTR(-EPROTONOSUPPORT);
331 goto error1;
332 }
333
334 /* Allocate structures */
335 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
336 if (!mad_agent_priv) {
337 ret = ERR_PTR(-ENOMEM);
338 goto error1;
339 }
340
341 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
342 IB_ACCESS_LOCAL_WRITE);
343 if (IS_ERR(mad_agent_priv->agent.mr)) {
344 ret = ERR_PTR(-ENOMEM);
345 goto error2;
346 }
347
348 if (mad_reg_req) {
349 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
350 if (!reg_req) {
351 ret = ERR_PTR(-ENOMEM);
352 goto error3;
353 }
354 }
355
356 /* Now, fill in the various structures */
357 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
358 mad_agent_priv->reg_req = reg_req;
359 mad_agent_priv->agent.rmpp_version = rmpp_version;
360 mad_agent_priv->agent.device = device;
361 mad_agent_priv->agent.recv_handler = recv_handler;
362 mad_agent_priv->agent.send_handler = send_handler;
363 mad_agent_priv->agent.context = context;
364 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
365 mad_agent_priv->agent.port_num = port_num;
366 mad_agent_priv->agent.flags = registration_flags;
367 spin_lock_init(&mad_agent_priv->lock);
368 INIT_LIST_HEAD(&mad_agent_priv->send_list);
369 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
370 INIT_LIST_HEAD(&mad_agent_priv->done_list);
371 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
372 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
373 INIT_LIST_HEAD(&mad_agent_priv->local_list);
374 INIT_WORK(&mad_agent_priv->local_work, local_completions);
375 atomic_set(&mad_agent_priv->refcount, 1);
376 init_completion(&mad_agent_priv->comp);
377
378 spin_lock_irqsave(&port_priv->reg_lock, flags);
379 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
380
381 /*
382 * Make sure MAD registration (if supplied)
383 * is non overlapping with any existing ones
384 */
385 if (mad_reg_req) {
386 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
387 if (!is_vendor_class(mgmt_class)) {
388 class = port_priv->version[mad_reg_req->
389 mgmt_class_version].class;
390 if (class) {
391 method = class->method_table[mgmt_class];
392 if (method) {
393 if (method_in_use(&method,
394 mad_reg_req))
395 goto error4;
396 }
397 }
398 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
399 mgmt_class);
400 } else {
401 /* "New" vendor class range */
402 vendor = port_priv->version[mad_reg_req->
403 mgmt_class_version].vendor;
404 if (vendor) {
405 vclass = vendor_class_index(mgmt_class);
406 vendor_class = vendor->vendor_class[vclass];
407 if (vendor_class) {
408 if (is_vendor_method_in_use(
409 vendor_class,
410 mad_reg_req))
411 goto error4;
412 }
413 }
414 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
415 }
416 if (ret2) {
417 ret = ERR_PTR(ret2);
418 goto error4;
419 }
420 }
421
422 /* Add mad agent into port's agent list */
423 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
424 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
425
426 return &mad_agent_priv->agent;
427
428 error4:
429 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
430 kfree(reg_req);
431 error3:
432 ib_dereg_mr(mad_agent_priv->agent.mr);
433 error2:
434 kfree(mad_agent_priv);
435 error1:
436 return ret;
437 }
438 EXPORT_SYMBOL(ib_register_mad_agent);
439
440 static inline int is_snooping_sends(int mad_snoop_flags)
441 {
442 return (mad_snoop_flags &
443 (/*IB_MAD_SNOOP_POSTED_SENDS |
444 IB_MAD_SNOOP_RMPP_SENDS |*/
445 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
446 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
447 }
448
449 static inline int is_snooping_recvs(int mad_snoop_flags)
450 {
451 return (mad_snoop_flags &
452 (IB_MAD_SNOOP_RECVS /*|
453 IB_MAD_SNOOP_RMPP_RECVS*/));
454 }
455
456 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
457 struct ib_mad_snoop_private *mad_snoop_priv)
458 {
459 struct ib_mad_snoop_private **new_snoop_table;
460 unsigned long flags;
461 int i;
462
463 spin_lock_irqsave(&qp_info->snoop_lock, flags);
464 /* Check for empty slot in array. */
465 for (i = 0; i < qp_info->snoop_table_size; i++)
466 if (!qp_info->snoop_table[i])
467 break;
468
469 if (i == qp_info->snoop_table_size) {
470 /* Grow table. */
471 new_snoop_table = krealloc(qp_info->snoop_table,
472 sizeof mad_snoop_priv *
473 (qp_info->snoop_table_size + 1),
474 GFP_ATOMIC);
475 if (!new_snoop_table) {
476 i = -ENOMEM;
477 goto out;
478 }
479
480 qp_info->snoop_table = new_snoop_table;
481 qp_info->snoop_table_size++;
482 }
483 qp_info->snoop_table[i] = mad_snoop_priv;
484 atomic_inc(&qp_info->snoop_count);
485 out:
486 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
487 return i;
488 }
489
490 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
491 u8 port_num,
492 enum ib_qp_type qp_type,
493 int mad_snoop_flags,
494 ib_mad_snoop_handler snoop_handler,
495 ib_mad_recv_handler recv_handler,
496 void *context)
497 {
498 struct ib_mad_port_private *port_priv;
499 struct ib_mad_agent *ret;
500 struct ib_mad_snoop_private *mad_snoop_priv;
501 int qpn;
502
503 /* Validate parameters */
504 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
505 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
506 ret = ERR_PTR(-EINVAL);
507 goto error1;
508 }
509 qpn = get_spl_qp_index(qp_type);
510 if (qpn == -1) {
511 ret = ERR_PTR(-EINVAL);
512 goto error1;
513 }
514 port_priv = ib_get_mad_port(device, port_num);
515 if (!port_priv) {
516 ret = ERR_PTR(-ENODEV);
517 goto error1;
518 }
519 /* Allocate structures */
520 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
521 if (!mad_snoop_priv) {
522 ret = ERR_PTR(-ENOMEM);
523 goto error1;
524 }
525
526 /* Now, fill in the various structures */
527 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
528 mad_snoop_priv->agent.device = device;
529 mad_snoop_priv->agent.recv_handler = recv_handler;
530 mad_snoop_priv->agent.snoop_handler = snoop_handler;
531 mad_snoop_priv->agent.context = context;
532 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
533 mad_snoop_priv->agent.port_num = port_num;
534 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
535 init_completion(&mad_snoop_priv->comp);
536 mad_snoop_priv->snoop_index = register_snoop_agent(
537 &port_priv->qp_info[qpn],
538 mad_snoop_priv);
539 if (mad_snoop_priv->snoop_index < 0) {
540 ret = ERR_PTR(mad_snoop_priv->snoop_index);
541 goto error2;
542 }
543
544 atomic_set(&mad_snoop_priv->refcount, 1);
545 return &mad_snoop_priv->agent;
546
547 error2:
548 kfree(mad_snoop_priv);
549 error1:
550 return ret;
551 }
552 EXPORT_SYMBOL(ib_register_mad_snoop);
553
554 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
555 {
556 if (atomic_dec_and_test(&mad_agent_priv->refcount))
557 complete(&mad_agent_priv->comp);
558 }
559
560 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
561 {
562 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
563 complete(&mad_snoop_priv->comp);
564 }
565
566 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
567 {
568 struct ib_mad_port_private *port_priv;
569 unsigned long flags;
570
571 /* Note that we could still be handling received MADs */
572
573 /*
574 * Canceling all sends results in dropping received response
575 * MADs, preventing us from queuing additional work
576 */
577 cancel_mads(mad_agent_priv);
578 port_priv = mad_agent_priv->qp_info->port_priv;
579 cancel_delayed_work(&mad_agent_priv->timed_work);
580
581 spin_lock_irqsave(&port_priv->reg_lock, flags);
582 remove_mad_reg_req(mad_agent_priv);
583 list_del(&mad_agent_priv->agent_list);
584 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
585
586 flush_workqueue(port_priv->wq);
587 ib_cancel_rmpp_recvs(mad_agent_priv);
588
589 deref_mad_agent(mad_agent_priv);
590 wait_for_completion(&mad_agent_priv->comp);
591
592 kfree(mad_agent_priv->reg_req);
593 ib_dereg_mr(mad_agent_priv->agent.mr);
594 kfree(mad_agent_priv);
595 }
596
597 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
598 {
599 struct ib_mad_qp_info *qp_info;
600 unsigned long flags;
601
602 qp_info = mad_snoop_priv->qp_info;
603 spin_lock_irqsave(&qp_info->snoop_lock, flags);
604 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
605 atomic_dec(&qp_info->snoop_count);
606 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
607
608 deref_snoop_agent(mad_snoop_priv);
609 wait_for_completion(&mad_snoop_priv->comp);
610
611 kfree(mad_snoop_priv);
612 }
613
614 /*
615 * ib_unregister_mad_agent - Unregisters a client from using MAD services
616 */
617 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
618 {
619 struct ib_mad_agent_private *mad_agent_priv;
620 struct ib_mad_snoop_private *mad_snoop_priv;
621
622 /* If the TID is zero, the agent can only snoop. */
623 if (mad_agent->hi_tid) {
624 mad_agent_priv = container_of(mad_agent,
625 struct ib_mad_agent_private,
626 agent);
627 unregister_mad_agent(mad_agent_priv);
628 } else {
629 mad_snoop_priv = container_of(mad_agent,
630 struct ib_mad_snoop_private,
631 agent);
632 unregister_mad_snoop(mad_snoop_priv);
633 }
634 return 0;
635 }
636 EXPORT_SYMBOL(ib_unregister_mad_agent);
637
638 static void dequeue_mad(struct ib_mad_list_head *mad_list)
639 {
640 struct ib_mad_queue *mad_queue;
641 unsigned long flags;
642
643 BUG_ON(!mad_list->mad_queue);
644 mad_queue = mad_list->mad_queue;
645 spin_lock_irqsave(&mad_queue->lock, flags);
646 list_del(&mad_list->list);
647 mad_queue->count--;
648 spin_unlock_irqrestore(&mad_queue->lock, flags);
649 }
650
651 static void snoop_send(struct ib_mad_qp_info *qp_info,
652 struct ib_mad_send_buf *send_buf,
653 struct ib_mad_send_wc *mad_send_wc,
654 int mad_snoop_flags)
655 {
656 struct ib_mad_snoop_private *mad_snoop_priv;
657 unsigned long flags;
658 int i;
659
660 spin_lock_irqsave(&qp_info->snoop_lock, flags);
661 for (i = 0; i < qp_info->snoop_table_size; i++) {
662 mad_snoop_priv = qp_info->snoop_table[i];
663 if (!mad_snoop_priv ||
664 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
665 continue;
666
667 atomic_inc(&mad_snoop_priv->refcount);
668 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
669 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
670 send_buf, mad_send_wc);
671 deref_snoop_agent(mad_snoop_priv);
672 spin_lock_irqsave(&qp_info->snoop_lock, flags);
673 }
674 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
675 }
676
677 static void snoop_recv(struct ib_mad_qp_info *qp_info,
678 struct ib_mad_recv_wc *mad_recv_wc,
679 int mad_snoop_flags)
680 {
681 struct ib_mad_snoop_private *mad_snoop_priv;
682 unsigned long flags;
683 int i;
684
685 spin_lock_irqsave(&qp_info->snoop_lock, flags);
686 for (i = 0; i < qp_info->snoop_table_size; i++) {
687 mad_snoop_priv = qp_info->snoop_table[i];
688 if (!mad_snoop_priv ||
689 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
690 continue;
691
692 atomic_inc(&mad_snoop_priv->refcount);
693 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
694 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
695 mad_recv_wc);
696 deref_snoop_agent(mad_snoop_priv);
697 spin_lock_irqsave(&qp_info->snoop_lock, flags);
698 }
699 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
700 }
701
702 static void build_smp_wc(struct ib_qp *qp,
703 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
704 struct ib_wc *wc)
705 {
706 memset(wc, 0, sizeof *wc);
707 wc->wr_id = wr_id;
708 wc->status = IB_WC_SUCCESS;
709 wc->opcode = IB_WC_RECV;
710 wc->pkey_index = pkey_index;
711 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
712 wc->src_qp = IB_QP0;
713 wc->qp = qp;
714 wc->slid = slid;
715 wc->sl = 0;
716 wc->dlid_path_bits = 0;
717 wc->port_num = port_num;
718 }
719
720 static size_t mad_priv_size(const struct ib_mad_private *mp)
721 {
722 return sizeof(struct ib_mad_private) + mp->mad_size;
723 }
724
725 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
726 {
727 size_t size = sizeof(struct ib_mad_private) + mad_size;
728 struct ib_mad_private *ret = kzalloc(size, flags);
729
730 if (ret)
731 ret->mad_size = mad_size;
732
733 return ret;
734 }
735
736 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
737 {
738 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
739 }
740
741 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
742 {
743 return sizeof(struct ib_grh) + mp->mad_size;
744 }
745
746 /*
747 * Return 0 if SMP is to be sent
748 * Return 1 if SMP was consumed locally (whether or not solicited)
749 * Return < 0 if error
750 */
751 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
752 struct ib_mad_send_wr_private *mad_send_wr)
753 {
754 int ret = 0;
755 struct ib_smp *smp = mad_send_wr->send_buf.mad;
756 struct opa_smp *opa_smp = (struct opa_smp *)smp;
757 unsigned long flags;
758 struct ib_mad_local_private *local;
759 struct ib_mad_private *mad_priv;
760 struct ib_mad_port_private *port_priv;
761 struct ib_mad_agent_private *recv_mad_agent = NULL;
762 struct ib_device *device = mad_agent_priv->agent.device;
763 u8 port_num;
764 struct ib_wc mad_wc;
765 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
766 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
767 u16 out_mad_pkey_index = 0;
768 u16 drslid;
769 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
770 mad_agent_priv->qp_info->port_priv->port_num);
771
772 if (rdma_cap_ib_switch(device) &&
773 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
774 port_num = send_wr->wr.ud.port_num;
775 else
776 port_num = mad_agent_priv->agent.port_num;
777
778 /*
779 * Directed route handling starts if the initial LID routed part of
780 * a request or the ending LID routed part of a response is empty.
781 * If we are at the start of the LID routed part, don't update the
782 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
783 */
784 if (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
785 u32 opa_drslid;
786
787 if ((opa_get_smp_direction(opa_smp)
788 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
789 OPA_LID_PERMISSIVE &&
790 opa_smi_handle_dr_smp_send(opa_smp,
791 rdma_cap_ib_switch(device),
792 port_num) == IB_SMI_DISCARD) {
793 ret = -EINVAL;
794 dev_err(&device->dev, "OPA Invalid directed route\n");
795 goto out;
796 }
797 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
798 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
799 opa_drslid & 0xffff0000) {
800 ret = -EINVAL;
801 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
802 opa_drslid);
803 goto out;
804 }
805 drslid = (u16)(opa_drslid & 0x0000ffff);
806
807 /* Check to post send on QP or process locally */
808 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
809 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
810 goto out;
811 } else {
812 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
813 IB_LID_PERMISSIVE &&
814 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
815 IB_SMI_DISCARD) {
816 ret = -EINVAL;
817 dev_err(&device->dev, "Invalid directed route\n");
818 goto out;
819 }
820 drslid = be16_to_cpu(smp->dr_slid);
821
822 /* Check to post send on QP or process locally */
823 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
824 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
825 goto out;
826 }
827
828 local = kmalloc(sizeof *local, GFP_ATOMIC);
829 if (!local) {
830 ret = -ENOMEM;
831 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
832 goto out;
833 }
834 local->mad_priv = NULL;
835 local->recv_mad_agent = NULL;
836 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
837 if (!mad_priv) {
838 ret = -ENOMEM;
839 dev_err(&device->dev, "No memory for local response MAD\n");
840 kfree(local);
841 goto out;
842 }
843
844 build_smp_wc(mad_agent_priv->agent.qp,
845 send_wr->wr_id, drslid,
846 send_wr->wr.ud.pkey_index,
847 send_wr->wr.ud.port_num, &mad_wc);
848
849 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
850 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
851 + mad_send_wr->send_buf.data_len
852 + sizeof(struct ib_grh);
853 }
854
855 /* No GRH for DR SMP */
856 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
857 (const struct ib_mad_hdr *)smp, mad_size,
858 (struct ib_mad_hdr *)mad_priv->mad,
859 &mad_size, &out_mad_pkey_index);
860 switch (ret)
861 {
862 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
863 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
864 mad_agent_priv->agent.recv_handler) {
865 local->mad_priv = mad_priv;
866 local->recv_mad_agent = mad_agent_priv;
867 /*
868 * Reference MAD agent until receive
869 * side of local completion handled
870 */
871 atomic_inc(&mad_agent_priv->refcount);
872 } else
873 kfree(mad_priv);
874 break;
875 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
876 kfree(mad_priv);
877 break;
878 case IB_MAD_RESULT_SUCCESS:
879 /* Treat like an incoming receive MAD */
880 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
881 mad_agent_priv->agent.port_num);
882 if (port_priv) {
883 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
884 recv_mad_agent = find_mad_agent(port_priv,
885 (const struct ib_mad_hdr *)mad_priv->mad);
886 }
887 if (!port_priv || !recv_mad_agent) {
888 /*
889 * No receiving agent so drop packet and
890 * generate send completion.
891 */
892 kfree(mad_priv);
893 break;
894 }
895 local->mad_priv = mad_priv;
896 local->recv_mad_agent = recv_mad_agent;
897 break;
898 default:
899 kfree(mad_priv);
900 kfree(local);
901 ret = -EINVAL;
902 goto out;
903 }
904
905 local->mad_send_wr = mad_send_wr;
906 if (opa) {
907 local->mad_send_wr->send_wr.wr.ud.pkey_index = out_mad_pkey_index;
908 local->return_wc_byte_len = mad_size;
909 }
910 /* Reference MAD agent until send side of local completion handled */
911 atomic_inc(&mad_agent_priv->refcount);
912 /* Queue local completion to local list */
913 spin_lock_irqsave(&mad_agent_priv->lock, flags);
914 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
915 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
916 queue_work(mad_agent_priv->qp_info->port_priv->wq,
917 &mad_agent_priv->local_work);
918 ret = 1;
919 out:
920 return ret;
921 }
922
923 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
924 {
925 int seg_size, pad;
926
927 seg_size = mad_size - hdr_len;
928 if (data_len && seg_size) {
929 pad = seg_size - data_len % seg_size;
930 return pad == seg_size ? 0 : pad;
931 } else
932 return seg_size;
933 }
934
935 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
936 {
937 struct ib_rmpp_segment *s, *t;
938
939 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
940 list_del(&s->list);
941 kfree(s);
942 }
943 }
944
945 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
946 size_t mad_size, gfp_t gfp_mask)
947 {
948 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
949 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
950 struct ib_rmpp_segment *seg = NULL;
951 int left, seg_size, pad;
952
953 send_buf->seg_size = mad_size - send_buf->hdr_len;
954 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
955 seg_size = send_buf->seg_size;
956 pad = send_wr->pad;
957
958 /* Allocate data segments. */
959 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
960 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
961 if (!seg) {
962 dev_err(&send_buf->mad_agent->device->dev,
963 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
964 sizeof (*seg) + seg_size, gfp_mask);
965 free_send_rmpp_list(send_wr);
966 return -ENOMEM;
967 }
968 seg->num = ++send_buf->seg_count;
969 list_add_tail(&seg->list, &send_wr->rmpp_list);
970 }
971
972 /* Zero any padding */
973 if (pad)
974 memset(seg->data + seg_size - pad, 0, pad);
975
976 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
977 agent.rmpp_version;
978 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
979 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
980
981 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
982 struct ib_rmpp_segment, list);
983 send_wr->last_ack_seg = send_wr->cur_seg;
984 return 0;
985 }
986
987 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
988 {
989 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
990 }
991 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
992
993 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
994 u32 remote_qpn, u16 pkey_index,
995 int rmpp_active,
996 int hdr_len, int data_len,
997 gfp_t gfp_mask,
998 u8 base_version)
999 {
1000 struct ib_mad_agent_private *mad_agent_priv;
1001 struct ib_mad_send_wr_private *mad_send_wr;
1002 int pad, message_size, ret, size;
1003 void *buf;
1004 size_t mad_size;
1005 bool opa;
1006
1007 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1008 agent);
1009
1010 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1011
1012 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1013 mad_size = sizeof(struct opa_mad);
1014 else
1015 mad_size = sizeof(struct ib_mad);
1016
1017 pad = get_pad_size(hdr_len, data_len, mad_size);
1018 message_size = hdr_len + data_len + pad;
1019
1020 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1021 if (!rmpp_active && message_size > mad_size)
1022 return ERR_PTR(-EINVAL);
1023 } else
1024 if (rmpp_active || message_size > mad_size)
1025 return ERR_PTR(-EINVAL);
1026
1027 size = rmpp_active ? hdr_len : mad_size;
1028 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1029 if (!buf)
1030 return ERR_PTR(-ENOMEM);
1031
1032 mad_send_wr = buf + size;
1033 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1034 mad_send_wr->send_buf.mad = buf;
1035 mad_send_wr->send_buf.hdr_len = hdr_len;
1036 mad_send_wr->send_buf.data_len = data_len;
1037 mad_send_wr->pad = pad;
1038
1039 mad_send_wr->mad_agent_priv = mad_agent_priv;
1040 mad_send_wr->sg_list[0].length = hdr_len;
1041 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
1042
1043 /* OPA MADs don't have to be the full 2048 bytes */
1044 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1045 data_len < mad_size - hdr_len)
1046 mad_send_wr->sg_list[1].length = data_len;
1047 else
1048 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1049
1050 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
1051
1052 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
1053 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
1054 mad_send_wr->send_wr.num_sge = 2;
1055 mad_send_wr->send_wr.opcode = IB_WR_SEND;
1056 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
1057 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
1058 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
1059 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
1060
1061 if (rmpp_active) {
1062 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1063 if (ret) {
1064 kfree(buf);
1065 return ERR_PTR(ret);
1066 }
1067 }
1068
1069 mad_send_wr->send_buf.mad_agent = mad_agent;
1070 atomic_inc(&mad_agent_priv->refcount);
1071 return &mad_send_wr->send_buf;
1072 }
1073 EXPORT_SYMBOL(ib_create_send_mad);
1074
1075 int ib_get_mad_data_offset(u8 mgmt_class)
1076 {
1077 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1078 return IB_MGMT_SA_HDR;
1079 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1080 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1081 (mgmt_class == IB_MGMT_CLASS_BIS))
1082 return IB_MGMT_DEVICE_HDR;
1083 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1084 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1085 return IB_MGMT_VENDOR_HDR;
1086 else
1087 return IB_MGMT_MAD_HDR;
1088 }
1089 EXPORT_SYMBOL(ib_get_mad_data_offset);
1090
1091 int ib_is_mad_class_rmpp(u8 mgmt_class)
1092 {
1093 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1094 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1095 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1096 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1097 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1098 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1099 return 1;
1100 return 0;
1101 }
1102 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1103
1104 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1105 {
1106 struct ib_mad_send_wr_private *mad_send_wr;
1107 struct list_head *list;
1108
1109 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1110 send_buf);
1111 list = &mad_send_wr->cur_seg->list;
1112
1113 if (mad_send_wr->cur_seg->num < seg_num) {
1114 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1115 if (mad_send_wr->cur_seg->num == seg_num)
1116 break;
1117 } else if (mad_send_wr->cur_seg->num > seg_num) {
1118 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1119 if (mad_send_wr->cur_seg->num == seg_num)
1120 break;
1121 }
1122 return mad_send_wr->cur_seg->data;
1123 }
1124 EXPORT_SYMBOL(ib_get_rmpp_segment);
1125
1126 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1127 {
1128 if (mad_send_wr->send_buf.seg_count)
1129 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1130 mad_send_wr->seg_num);
1131 else
1132 return mad_send_wr->send_buf.mad +
1133 mad_send_wr->send_buf.hdr_len;
1134 }
1135
1136 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1137 {
1138 struct ib_mad_agent_private *mad_agent_priv;
1139 struct ib_mad_send_wr_private *mad_send_wr;
1140
1141 mad_agent_priv = container_of(send_buf->mad_agent,
1142 struct ib_mad_agent_private, agent);
1143 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1144 send_buf);
1145
1146 free_send_rmpp_list(mad_send_wr);
1147 kfree(send_buf->mad);
1148 deref_mad_agent(mad_agent_priv);
1149 }
1150 EXPORT_SYMBOL(ib_free_send_mad);
1151
1152 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1153 {
1154 struct ib_mad_qp_info *qp_info;
1155 struct list_head *list;
1156 struct ib_send_wr *bad_send_wr;
1157 struct ib_mad_agent *mad_agent;
1158 struct ib_sge *sge;
1159 unsigned long flags;
1160 int ret;
1161
1162 /* Set WR ID to find mad_send_wr upon completion */
1163 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1164 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1165 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1166
1167 mad_agent = mad_send_wr->send_buf.mad_agent;
1168 sge = mad_send_wr->sg_list;
1169 sge[0].addr = ib_dma_map_single(mad_agent->device,
1170 mad_send_wr->send_buf.mad,
1171 sge[0].length,
1172 DMA_TO_DEVICE);
1173 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1174 return -ENOMEM;
1175
1176 mad_send_wr->header_mapping = sge[0].addr;
1177
1178 sge[1].addr = ib_dma_map_single(mad_agent->device,
1179 ib_get_payload(mad_send_wr),
1180 sge[1].length,
1181 DMA_TO_DEVICE);
1182 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1183 ib_dma_unmap_single(mad_agent->device,
1184 mad_send_wr->header_mapping,
1185 sge[0].length, DMA_TO_DEVICE);
1186 return -ENOMEM;
1187 }
1188 mad_send_wr->payload_mapping = sge[1].addr;
1189
1190 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1191 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1192 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1193 &bad_send_wr);
1194 list = &qp_info->send_queue.list;
1195 } else {
1196 ret = 0;
1197 list = &qp_info->overflow_list;
1198 }
1199
1200 if (!ret) {
1201 qp_info->send_queue.count++;
1202 list_add_tail(&mad_send_wr->mad_list.list, list);
1203 }
1204 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1205 if (ret) {
1206 ib_dma_unmap_single(mad_agent->device,
1207 mad_send_wr->header_mapping,
1208 sge[0].length, DMA_TO_DEVICE);
1209 ib_dma_unmap_single(mad_agent->device,
1210 mad_send_wr->payload_mapping,
1211 sge[1].length, DMA_TO_DEVICE);
1212 }
1213 return ret;
1214 }
1215
1216 /*
1217 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1218 * with the registered client
1219 */
1220 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1221 struct ib_mad_send_buf **bad_send_buf)
1222 {
1223 struct ib_mad_agent_private *mad_agent_priv;
1224 struct ib_mad_send_buf *next_send_buf;
1225 struct ib_mad_send_wr_private *mad_send_wr;
1226 unsigned long flags;
1227 int ret = -EINVAL;
1228
1229 /* Walk list of send WRs and post each on send list */
1230 for (; send_buf; send_buf = next_send_buf) {
1231
1232 mad_send_wr = container_of(send_buf,
1233 struct ib_mad_send_wr_private,
1234 send_buf);
1235 mad_agent_priv = mad_send_wr->mad_agent_priv;
1236
1237 if (!send_buf->mad_agent->send_handler ||
1238 (send_buf->timeout_ms &&
1239 !send_buf->mad_agent->recv_handler)) {
1240 ret = -EINVAL;
1241 goto error;
1242 }
1243
1244 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1245 if (mad_agent_priv->agent.rmpp_version) {
1246 ret = -EINVAL;
1247 goto error;
1248 }
1249 }
1250
1251 /*
1252 * Save pointer to next work request to post in case the
1253 * current one completes, and the user modifies the work
1254 * request associated with the completion
1255 */
1256 next_send_buf = send_buf->next;
1257 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1258
1259 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1260 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1261 ret = handle_outgoing_dr_smp(mad_agent_priv,
1262 mad_send_wr);
1263 if (ret < 0) /* error */
1264 goto error;
1265 else if (ret == 1) /* locally consumed */
1266 continue;
1267 }
1268
1269 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1270 /* Timeout will be updated after send completes */
1271 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1272 mad_send_wr->max_retries = send_buf->retries;
1273 mad_send_wr->retries_left = send_buf->retries;
1274 send_buf->retries = 0;
1275 /* Reference for work request to QP + response */
1276 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1277 mad_send_wr->status = IB_WC_SUCCESS;
1278
1279 /* Reference MAD agent until send completes */
1280 atomic_inc(&mad_agent_priv->refcount);
1281 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1282 list_add_tail(&mad_send_wr->agent_list,
1283 &mad_agent_priv->send_list);
1284 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1285
1286 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1287 ret = ib_send_rmpp_mad(mad_send_wr);
1288 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1289 ret = ib_send_mad(mad_send_wr);
1290 } else
1291 ret = ib_send_mad(mad_send_wr);
1292 if (ret < 0) {
1293 /* Fail send request */
1294 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1295 list_del(&mad_send_wr->agent_list);
1296 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1297 atomic_dec(&mad_agent_priv->refcount);
1298 goto error;
1299 }
1300 }
1301 return 0;
1302 error:
1303 if (bad_send_buf)
1304 *bad_send_buf = send_buf;
1305 return ret;
1306 }
1307 EXPORT_SYMBOL(ib_post_send_mad);
1308
1309 /*
1310 * ib_free_recv_mad - Returns data buffers used to receive
1311 * a MAD to the access layer
1312 */
1313 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1314 {
1315 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1316 struct ib_mad_private_header *mad_priv_hdr;
1317 struct ib_mad_private *priv;
1318 struct list_head free_list;
1319
1320 INIT_LIST_HEAD(&free_list);
1321 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1322
1323 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1324 &free_list, list) {
1325 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1326 recv_buf);
1327 mad_priv_hdr = container_of(mad_recv_wc,
1328 struct ib_mad_private_header,
1329 recv_wc);
1330 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1331 header);
1332 kfree(priv);
1333 }
1334 }
1335 EXPORT_SYMBOL(ib_free_recv_mad);
1336
1337 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1338 u8 rmpp_version,
1339 ib_mad_send_handler send_handler,
1340 ib_mad_recv_handler recv_handler,
1341 void *context)
1342 {
1343 return ERR_PTR(-EINVAL); /* XXX: for now */
1344 }
1345 EXPORT_SYMBOL(ib_redirect_mad_qp);
1346
1347 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1348 struct ib_wc *wc)
1349 {
1350 dev_err(&mad_agent->device->dev,
1351 "ib_process_mad_wc() not implemented yet\n");
1352 return 0;
1353 }
1354 EXPORT_SYMBOL(ib_process_mad_wc);
1355
1356 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1357 struct ib_mad_reg_req *mad_reg_req)
1358 {
1359 int i;
1360
1361 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1362 if ((*method)->agent[i]) {
1363 pr_err("Method %d already in use\n", i);
1364 return -EINVAL;
1365 }
1366 }
1367 return 0;
1368 }
1369
1370 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1371 {
1372 /* Allocate management method table */
1373 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1374 if (!*method) {
1375 pr_err("No memory for ib_mad_mgmt_method_table\n");
1376 return -ENOMEM;
1377 }
1378
1379 return 0;
1380 }
1381
1382 /*
1383 * Check to see if there are any methods still in use
1384 */
1385 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1386 {
1387 int i;
1388
1389 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1390 if (method->agent[i])
1391 return 1;
1392 return 0;
1393 }
1394
1395 /*
1396 * Check to see if there are any method tables for this class still in use
1397 */
1398 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1399 {
1400 int i;
1401
1402 for (i = 0; i < MAX_MGMT_CLASS; i++)
1403 if (class->method_table[i])
1404 return 1;
1405 return 0;
1406 }
1407
1408 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1409 {
1410 int i;
1411
1412 for (i = 0; i < MAX_MGMT_OUI; i++)
1413 if (vendor_class->method_table[i])
1414 return 1;
1415 return 0;
1416 }
1417
1418 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1419 const char *oui)
1420 {
1421 int i;
1422
1423 for (i = 0; i < MAX_MGMT_OUI; i++)
1424 /* Is there matching OUI for this vendor class ? */
1425 if (!memcmp(vendor_class->oui[i], oui, 3))
1426 return i;
1427
1428 return -1;
1429 }
1430
1431 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1432 {
1433 int i;
1434
1435 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1436 if (vendor->vendor_class[i])
1437 return 1;
1438
1439 return 0;
1440 }
1441
1442 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1443 struct ib_mad_agent_private *agent)
1444 {
1445 int i;
1446
1447 /* Remove any methods for this mad agent */
1448 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1449 if (method->agent[i] == agent) {
1450 method->agent[i] = NULL;
1451 }
1452 }
1453 }
1454
1455 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1456 struct ib_mad_agent_private *agent_priv,
1457 u8 mgmt_class)
1458 {
1459 struct ib_mad_port_private *port_priv;
1460 struct ib_mad_mgmt_class_table **class;
1461 struct ib_mad_mgmt_method_table **method;
1462 int i, ret;
1463
1464 port_priv = agent_priv->qp_info->port_priv;
1465 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1466 if (!*class) {
1467 /* Allocate management class table for "new" class version */
1468 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1469 if (!*class) {
1470 dev_err(&agent_priv->agent.device->dev,
1471 "No memory for ib_mad_mgmt_class_table\n");
1472 ret = -ENOMEM;
1473 goto error1;
1474 }
1475
1476 /* Allocate method table for this management class */
1477 method = &(*class)->method_table[mgmt_class];
1478 if ((ret = allocate_method_table(method)))
1479 goto error2;
1480 } else {
1481 method = &(*class)->method_table[mgmt_class];
1482 if (!*method) {
1483 /* Allocate method table for this management class */
1484 if ((ret = allocate_method_table(method)))
1485 goto error1;
1486 }
1487 }
1488
1489 /* Now, make sure methods are not already in use */
1490 if (method_in_use(method, mad_reg_req))
1491 goto error3;
1492
1493 /* Finally, add in methods being registered */
1494 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1495 (*method)->agent[i] = agent_priv;
1496
1497 return 0;
1498
1499 error3:
1500 /* Remove any methods for this mad agent */
1501 remove_methods_mad_agent(*method, agent_priv);
1502 /* Now, check to see if there are any methods in use */
1503 if (!check_method_table(*method)) {
1504 /* If not, release management method table */
1505 kfree(*method);
1506 *method = NULL;
1507 }
1508 ret = -EINVAL;
1509 goto error1;
1510 error2:
1511 kfree(*class);
1512 *class = NULL;
1513 error1:
1514 return ret;
1515 }
1516
1517 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1518 struct ib_mad_agent_private *agent_priv)
1519 {
1520 struct ib_mad_port_private *port_priv;
1521 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1522 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1523 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1524 struct ib_mad_mgmt_method_table **method;
1525 int i, ret = -ENOMEM;
1526 u8 vclass;
1527
1528 /* "New" vendor (with OUI) class */
1529 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1530 port_priv = agent_priv->qp_info->port_priv;
1531 vendor_table = &port_priv->version[
1532 mad_reg_req->mgmt_class_version].vendor;
1533 if (!*vendor_table) {
1534 /* Allocate mgmt vendor class table for "new" class version */
1535 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1536 if (!vendor) {
1537 dev_err(&agent_priv->agent.device->dev,
1538 "No memory for ib_mad_mgmt_vendor_class_table\n");
1539 goto error1;
1540 }
1541
1542 *vendor_table = vendor;
1543 }
1544 if (!(*vendor_table)->vendor_class[vclass]) {
1545 /* Allocate table for this management vendor class */
1546 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1547 if (!vendor_class) {
1548 dev_err(&agent_priv->agent.device->dev,
1549 "No memory for ib_mad_mgmt_vendor_class\n");
1550 goto error2;
1551 }
1552
1553 (*vendor_table)->vendor_class[vclass] = vendor_class;
1554 }
1555 for (i = 0; i < MAX_MGMT_OUI; i++) {
1556 /* Is there matching OUI for this vendor class ? */
1557 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1558 mad_reg_req->oui, 3)) {
1559 method = &(*vendor_table)->vendor_class[
1560 vclass]->method_table[i];
1561 BUG_ON(!*method);
1562 goto check_in_use;
1563 }
1564 }
1565 for (i = 0; i < MAX_MGMT_OUI; i++) {
1566 /* OUI slot available ? */
1567 if (!is_vendor_oui((*vendor_table)->vendor_class[
1568 vclass]->oui[i])) {
1569 method = &(*vendor_table)->vendor_class[
1570 vclass]->method_table[i];
1571 BUG_ON(*method);
1572 /* Allocate method table for this OUI */
1573 if ((ret = allocate_method_table(method)))
1574 goto error3;
1575 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1576 mad_reg_req->oui, 3);
1577 goto check_in_use;
1578 }
1579 }
1580 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1581 goto error3;
1582
1583 check_in_use:
1584 /* Now, make sure methods are not already in use */
1585 if (method_in_use(method, mad_reg_req))
1586 goto error4;
1587
1588 /* Finally, add in methods being registered */
1589 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1590 (*method)->agent[i] = agent_priv;
1591
1592 return 0;
1593
1594 error4:
1595 /* Remove any methods for this mad agent */
1596 remove_methods_mad_agent(*method, agent_priv);
1597 /* Now, check to see if there are any methods in use */
1598 if (!check_method_table(*method)) {
1599 /* If not, release management method table */
1600 kfree(*method);
1601 *method = NULL;
1602 }
1603 ret = -EINVAL;
1604 error3:
1605 if (vendor_class) {
1606 (*vendor_table)->vendor_class[vclass] = NULL;
1607 kfree(vendor_class);
1608 }
1609 error2:
1610 if (vendor) {
1611 *vendor_table = NULL;
1612 kfree(vendor);
1613 }
1614 error1:
1615 return ret;
1616 }
1617
1618 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1619 {
1620 struct ib_mad_port_private *port_priv;
1621 struct ib_mad_mgmt_class_table *class;
1622 struct ib_mad_mgmt_method_table *method;
1623 struct ib_mad_mgmt_vendor_class_table *vendor;
1624 struct ib_mad_mgmt_vendor_class *vendor_class;
1625 int index;
1626 u8 mgmt_class;
1627
1628 /*
1629 * Was MAD registration request supplied
1630 * with original registration ?
1631 */
1632 if (!agent_priv->reg_req) {
1633 goto out;
1634 }
1635
1636 port_priv = agent_priv->qp_info->port_priv;
1637 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1638 class = port_priv->version[
1639 agent_priv->reg_req->mgmt_class_version].class;
1640 if (!class)
1641 goto vendor_check;
1642
1643 method = class->method_table[mgmt_class];
1644 if (method) {
1645 /* Remove any methods for this mad agent */
1646 remove_methods_mad_agent(method, agent_priv);
1647 /* Now, check to see if there are any methods still in use */
1648 if (!check_method_table(method)) {
1649 /* If not, release management method table */
1650 kfree(method);
1651 class->method_table[mgmt_class] = NULL;
1652 /* Any management classes left ? */
1653 if (!check_class_table(class)) {
1654 /* If not, release management class table */
1655 kfree(class);
1656 port_priv->version[
1657 agent_priv->reg_req->
1658 mgmt_class_version].class = NULL;
1659 }
1660 }
1661 }
1662
1663 vendor_check:
1664 if (!is_vendor_class(mgmt_class))
1665 goto out;
1666
1667 /* normalize mgmt_class to vendor range 2 */
1668 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1669 vendor = port_priv->version[
1670 agent_priv->reg_req->mgmt_class_version].vendor;
1671
1672 if (!vendor)
1673 goto out;
1674
1675 vendor_class = vendor->vendor_class[mgmt_class];
1676 if (vendor_class) {
1677 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1678 if (index < 0)
1679 goto out;
1680 method = vendor_class->method_table[index];
1681 if (method) {
1682 /* Remove any methods for this mad agent */
1683 remove_methods_mad_agent(method, agent_priv);
1684 /*
1685 * Now, check to see if there are
1686 * any methods still in use
1687 */
1688 if (!check_method_table(method)) {
1689 /* If not, release management method table */
1690 kfree(method);
1691 vendor_class->method_table[index] = NULL;
1692 memset(vendor_class->oui[index], 0, 3);
1693 /* Any OUIs left ? */
1694 if (!check_vendor_class(vendor_class)) {
1695 /* If not, release vendor class table */
1696 kfree(vendor_class);
1697 vendor->vendor_class[mgmt_class] = NULL;
1698 /* Any other vendor classes left ? */
1699 if (!check_vendor_table(vendor)) {
1700 kfree(vendor);
1701 port_priv->version[
1702 agent_priv->reg_req->
1703 mgmt_class_version].
1704 vendor = NULL;
1705 }
1706 }
1707 }
1708 }
1709 }
1710
1711 out:
1712 return;
1713 }
1714
1715 static struct ib_mad_agent_private *
1716 find_mad_agent(struct ib_mad_port_private *port_priv,
1717 const struct ib_mad_hdr *mad_hdr)
1718 {
1719 struct ib_mad_agent_private *mad_agent = NULL;
1720 unsigned long flags;
1721
1722 spin_lock_irqsave(&port_priv->reg_lock, flags);
1723 if (ib_response_mad(mad_hdr)) {
1724 u32 hi_tid;
1725 struct ib_mad_agent_private *entry;
1726
1727 /*
1728 * Routing is based on high 32 bits of transaction ID
1729 * of MAD.
1730 */
1731 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1732 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1733 if (entry->agent.hi_tid == hi_tid) {
1734 mad_agent = entry;
1735 break;
1736 }
1737 }
1738 } else {
1739 struct ib_mad_mgmt_class_table *class;
1740 struct ib_mad_mgmt_method_table *method;
1741 struct ib_mad_mgmt_vendor_class_table *vendor;
1742 struct ib_mad_mgmt_vendor_class *vendor_class;
1743 const struct ib_vendor_mad *vendor_mad;
1744 int index;
1745
1746 /*
1747 * Routing is based on version, class, and method
1748 * For "newer" vendor MADs, also based on OUI
1749 */
1750 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1751 goto out;
1752 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1753 class = port_priv->version[
1754 mad_hdr->class_version].class;
1755 if (!class)
1756 goto out;
1757 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1758 IB_MGMT_MAX_METHODS)
1759 goto out;
1760 method = class->method_table[convert_mgmt_class(
1761 mad_hdr->mgmt_class)];
1762 if (method)
1763 mad_agent = method->agent[mad_hdr->method &
1764 ~IB_MGMT_METHOD_RESP];
1765 } else {
1766 vendor = port_priv->version[
1767 mad_hdr->class_version].vendor;
1768 if (!vendor)
1769 goto out;
1770 vendor_class = vendor->vendor_class[vendor_class_index(
1771 mad_hdr->mgmt_class)];
1772 if (!vendor_class)
1773 goto out;
1774 /* Find matching OUI */
1775 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1776 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1777 if (index == -1)
1778 goto out;
1779 method = vendor_class->method_table[index];
1780 if (method) {
1781 mad_agent = method->agent[mad_hdr->method &
1782 ~IB_MGMT_METHOD_RESP];
1783 }
1784 }
1785 }
1786
1787 if (mad_agent) {
1788 if (mad_agent->agent.recv_handler)
1789 atomic_inc(&mad_agent->refcount);
1790 else {
1791 dev_notice(&port_priv->device->dev,
1792 "No receive handler for client %p on port %d\n",
1793 &mad_agent->agent, port_priv->port_num);
1794 mad_agent = NULL;
1795 }
1796 }
1797 out:
1798 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1799
1800 return mad_agent;
1801 }
1802
1803 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1804 const struct ib_mad_qp_info *qp_info,
1805 bool opa)
1806 {
1807 int valid = 0;
1808 u32 qp_num = qp_info->qp->qp_num;
1809
1810 /* Make sure MAD base version is understood */
1811 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1812 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1813 pr_err("MAD received with unsupported base version %d %s\n",
1814 mad_hdr->base_version, opa ? "(opa)" : "");
1815 goto out;
1816 }
1817
1818 /* Filter SMI packets sent to other than QP0 */
1819 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1820 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1821 if (qp_num == 0)
1822 valid = 1;
1823 } else {
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))
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_recv_wc->wc->wr_id = 0;
1991 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
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_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
2007 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2008 mad_recv_wc);
2009 atomic_dec(&mad_agent_priv->refcount);
2010
2011 mad_send_wc.status = IB_WC_SUCCESS;
2012 mad_send_wc.vendor_err = 0;
2013 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2014 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2015 }
2016 } else {
2017 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
2018 mad_recv_wc);
2019 deref_mad_agent(mad_agent_priv);
2020 }
2021 }
2022
2023 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2024 const struct ib_mad_qp_info *qp_info,
2025 const struct ib_wc *wc,
2026 int port_num,
2027 struct ib_mad_private *recv,
2028 struct ib_mad_private *response)
2029 {
2030 enum smi_forward_action retsmi;
2031 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2032
2033 if (smi_handle_dr_smp_recv(smp,
2034 rdma_cap_ib_switch(port_priv->device),
2035 port_num,
2036 port_priv->device->phys_port_cnt) ==
2037 IB_SMI_DISCARD)
2038 return IB_SMI_DISCARD;
2039
2040 retsmi = smi_check_forward_dr_smp(smp);
2041 if (retsmi == IB_SMI_LOCAL)
2042 return IB_SMI_HANDLE;
2043
2044 if (retsmi == IB_SMI_SEND) { /* don't forward */
2045 if (smi_handle_dr_smp_send(smp,
2046 rdma_cap_ib_switch(port_priv->device),
2047 port_num) == IB_SMI_DISCARD)
2048 return IB_SMI_DISCARD;
2049
2050 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2051 return IB_SMI_DISCARD;
2052 } else if (rdma_cap_ib_switch(port_priv->device)) {
2053 /* forward case for switches */
2054 memcpy(response, recv, mad_priv_size(response));
2055 response->header.recv_wc.wc = &response->header.wc;
2056 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2057 response->header.recv_wc.recv_buf.grh = &response->grh;
2058
2059 agent_send_response((const struct ib_mad_hdr *)response->mad,
2060 &response->grh, wc,
2061 port_priv->device,
2062 smi_get_fwd_port(smp),
2063 qp_info->qp->qp_num,
2064 response->mad_size,
2065 false);
2066
2067 return IB_SMI_DISCARD;
2068 }
2069 return IB_SMI_HANDLE;
2070 }
2071
2072 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2073 struct ib_mad_private *response,
2074 size_t *resp_len, bool opa)
2075 {
2076 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2077 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2078
2079 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2080 recv_hdr->method == IB_MGMT_METHOD_SET) {
2081 memcpy(response, recv, mad_priv_size(response));
2082 response->header.recv_wc.wc = &response->header.wc;
2083 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2084 response->header.recv_wc.recv_buf.grh = &response->grh;
2085 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2086 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2087 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2088 resp_hdr->status |= IB_SMP_DIRECTION;
2089
2090 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2091 if (recv_hdr->mgmt_class ==
2092 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2093 recv_hdr->mgmt_class ==
2094 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2095 *resp_len = opa_get_smp_header_size(
2096 (struct opa_smp *)recv->mad);
2097 else
2098 *resp_len = sizeof(struct ib_mad_hdr);
2099 }
2100
2101 return true;
2102 } else {
2103 return false;
2104 }
2105 }
2106
2107 static enum smi_action
2108 handle_opa_smi(struct ib_mad_port_private *port_priv,
2109 struct ib_mad_qp_info *qp_info,
2110 struct ib_wc *wc,
2111 int port_num,
2112 struct ib_mad_private *recv,
2113 struct ib_mad_private *response)
2114 {
2115 enum smi_forward_action retsmi;
2116 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2117
2118 if (opa_smi_handle_dr_smp_recv(smp,
2119 rdma_cap_ib_switch(port_priv->device),
2120 port_num,
2121 port_priv->device->phys_port_cnt) ==
2122 IB_SMI_DISCARD)
2123 return IB_SMI_DISCARD;
2124
2125 retsmi = opa_smi_check_forward_dr_smp(smp);
2126 if (retsmi == IB_SMI_LOCAL)
2127 return IB_SMI_HANDLE;
2128
2129 if (retsmi == IB_SMI_SEND) { /* don't forward */
2130 if (opa_smi_handle_dr_smp_send(smp,
2131 rdma_cap_ib_switch(port_priv->device),
2132 port_num) == IB_SMI_DISCARD)
2133 return IB_SMI_DISCARD;
2134
2135 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2136 IB_SMI_DISCARD)
2137 return IB_SMI_DISCARD;
2138
2139 } else if (rdma_cap_ib_switch(port_priv->device)) {
2140 /* forward case for switches */
2141 memcpy(response, recv, mad_priv_size(response));
2142 response->header.recv_wc.wc = &response->header.wc;
2143 response->header.recv_wc.recv_buf.opa_mad =
2144 (struct opa_mad *)response->mad;
2145 response->header.recv_wc.recv_buf.grh = &response->grh;
2146
2147 agent_send_response((const struct ib_mad_hdr *)response->mad,
2148 &response->grh, wc,
2149 port_priv->device,
2150 opa_smi_get_fwd_port(smp),
2151 qp_info->qp->qp_num,
2152 recv->header.wc.byte_len,
2153 true);
2154
2155 return IB_SMI_DISCARD;
2156 }
2157
2158 return IB_SMI_HANDLE;
2159 }
2160
2161 static enum smi_action
2162 handle_smi(struct ib_mad_port_private *port_priv,
2163 struct ib_mad_qp_info *qp_info,
2164 struct ib_wc *wc,
2165 int port_num,
2166 struct ib_mad_private *recv,
2167 struct ib_mad_private *response,
2168 bool opa)
2169 {
2170 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2171
2172 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2173 mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
2174 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2175 response);
2176
2177 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2178 }
2179
2180 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
2181 struct ib_wc *wc)
2182 {
2183 struct ib_mad_qp_info *qp_info;
2184 struct ib_mad_private_header *mad_priv_hdr;
2185 struct ib_mad_private *recv, *response = NULL;
2186 struct ib_mad_list_head *mad_list;
2187 struct ib_mad_agent_private *mad_agent;
2188 int port_num;
2189 int ret = IB_MAD_RESULT_SUCCESS;
2190 size_t mad_size;
2191 u16 resp_mad_pkey_index = 0;
2192 bool opa;
2193
2194 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2195 qp_info = mad_list->mad_queue->qp_info;
2196 dequeue_mad(mad_list);
2197
2198 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2199 qp_info->port_priv->port_num);
2200
2201 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2202 mad_list);
2203 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2204 ib_dma_unmap_single(port_priv->device,
2205 recv->header.mapping,
2206 mad_priv_dma_size(recv),
2207 DMA_FROM_DEVICE);
2208
2209 /* Setup MAD receive work completion from "normal" work completion */
2210 recv->header.wc = *wc;
2211 recv->header.recv_wc.wc = &recv->header.wc;
2212
2213 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2214 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2215 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2216 } else {
2217 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2218 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2219 }
2220
2221 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2222 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2223
2224 if (atomic_read(&qp_info->snoop_count))
2225 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2226
2227 /* Validate MAD */
2228 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2229 goto out;
2230
2231 mad_size = recv->mad_size;
2232 response = alloc_mad_private(mad_size, GFP_KERNEL);
2233 if (!response) {
2234 dev_err(&port_priv->device->dev,
2235 "ib_mad_recv_done_handler no memory for response buffer\n");
2236 goto out;
2237 }
2238
2239 if (rdma_cap_ib_switch(port_priv->device))
2240 port_num = wc->port_num;
2241 else
2242 port_num = port_priv->port_num;
2243
2244 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2245 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2246 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2247 response, opa)
2248 == IB_SMI_DISCARD)
2249 goto out;
2250 }
2251
2252 /* Give driver "right of first refusal" on incoming MAD */
2253 if (port_priv->device->process_mad) {
2254 ret = port_priv->device->process_mad(port_priv->device, 0,
2255 port_priv->port_num,
2256 wc, &recv->grh,
2257 (const struct ib_mad_hdr *)recv->mad,
2258 recv->mad_size,
2259 (struct ib_mad_hdr *)response->mad,
2260 &mad_size, &resp_mad_pkey_index);
2261
2262 if (opa)
2263 wc->pkey_index = resp_mad_pkey_index;
2264
2265 if (ret & IB_MAD_RESULT_SUCCESS) {
2266 if (ret & IB_MAD_RESULT_CONSUMED)
2267 goto out;
2268 if (ret & IB_MAD_RESULT_REPLY) {
2269 agent_send_response((const struct ib_mad_hdr *)response->mad,
2270 &recv->grh, wc,
2271 port_priv->device,
2272 port_num,
2273 qp_info->qp->qp_num,
2274 mad_size, opa);
2275 goto out;
2276 }
2277 }
2278 }
2279
2280 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2281 if (mad_agent) {
2282 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2283 /*
2284 * recv is freed up in error cases in ib_mad_complete_recv
2285 * or via recv_handler in ib_mad_complete_recv()
2286 */
2287 recv = NULL;
2288 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2289 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2290 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2291 port_priv->device, port_num,
2292 qp_info->qp->qp_num, mad_size, opa);
2293 }
2294
2295 out:
2296 /* Post another receive request for this QP */
2297 if (response) {
2298 ib_mad_post_receive_mads(qp_info, response);
2299 kfree(recv);
2300 } else
2301 ib_mad_post_receive_mads(qp_info, recv);
2302 }
2303
2304 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2305 {
2306 struct ib_mad_send_wr_private *mad_send_wr;
2307 unsigned long delay;
2308
2309 if (list_empty(&mad_agent_priv->wait_list)) {
2310 cancel_delayed_work(&mad_agent_priv->timed_work);
2311 } else {
2312 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2313 struct ib_mad_send_wr_private,
2314 agent_list);
2315
2316 if (time_after(mad_agent_priv->timeout,
2317 mad_send_wr->timeout)) {
2318 mad_agent_priv->timeout = mad_send_wr->timeout;
2319 delay = mad_send_wr->timeout - jiffies;
2320 if ((long)delay <= 0)
2321 delay = 1;
2322 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2323 &mad_agent_priv->timed_work, delay);
2324 }
2325 }
2326 }
2327
2328 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2329 {
2330 struct ib_mad_agent_private *mad_agent_priv;
2331 struct ib_mad_send_wr_private *temp_mad_send_wr;
2332 struct list_head *list_item;
2333 unsigned long delay;
2334
2335 mad_agent_priv = mad_send_wr->mad_agent_priv;
2336 list_del(&mad_send_wr->agent_list);
2337
2338 delay = mad_send_wr->timeout;
2339 mad_send_wr->timeout += jiffies;
2340
2341 if (delay) {
2342 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2343 temp_mad_send_wr = list_entry(list_item,
2344 struct ib_mad_send_wr_private,
2345 agent_list);
2346 if (time_after(mad_send_wr->timeout,
2347 temp_mad_send_wr->timeout))
2348 break;
2349 }
2350 }
2351 else
2352 list_item = &mad_agent_priv->wait_list;
2353 list_add(&mad_send_wr->agent_list, list_item);
2354
2355 /* Reschedule a work item if we have a shorter timeout */
2356 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2357 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2358 &mad_agent_priv->timed_work, delay);
2359 }
2360
2361 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2362 int timeout_ms)
2363 {
2364 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2365 wait_for_response(mad_send_wr);
2366 }
2367
2368 /*
2369 * Process a send work completion
2370 */
2371 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2372 struct ib_mad_send_wc *mad_send_wc)
2373 {
2374 struct ib_mad_agent_private *mad_agent_priv;
2375 unsigned long flags;
2376 int ret;
2377
2378 mad_agent_priv = mad_send_wr->mad_agent_priv;
2379 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2380 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2381 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2382 if (ret == IB_RMPP_RESULT_CONSUMED)
2383 goto done;
2384 } else
2385 ret = IB_RMPP_RESULT_UNHANDLED;
2386
2387 if (mad_send_wc->status != IB_WC_SUCCESS &&
2388 mad_send_wr->status == IB_WC_SUCCESS) {
2389 mad_send_wr->status = mad_send_wc->status;
2390 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2391 }
2392
2393 if (--mad_send_wr->refcount > 0) {
2394 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2395 mad_send_wr->status == IB_WC_SUCCESS) {
2396 wait_for_response(mad_send_wr);
2397 }
2398 goto done;
2399 }
2400
2401 /* Remove send from MAD agent and notify client of completion */
2402 list_del(&mad_send_wr->agent_list);
2403 adjust_timeout(mad_agent_priv);
2404 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2405
2406 if (mad_send_wr->status != IB_WC_SUCCESS )
2407 mad_send_wc->status = mad_send_wr->status;
2408 if (ret == IB_RMPP_RESULT_INTERNAL)
2409 ib_rmpp_send_handler(mad_send_wc);
2410 else
2411 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2412 mad_send_wc);
2413
2414 /* Release reference on agent taken when sending */
2415 deref_mad_agent(mad_agent_priv);
2416 return;
2417 done:
2418 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2419 }
2420
2421 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2422 struct ib_wc *wc)
2423 {
2424 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2425 struct ib_mad_list_head *mad_list;
2426 struct ib_mad_qp_info *qp_info;
2427 struct ib_mad_queue *send_queue;
2428 struct ib_send_wr *bad_send_wr;
2429 struct ib_mad_send_wc mad_send_wc;
2430 unsigned long flags;
2431 int ret;
2432
2433 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2434 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2435 mad_list);
2436 send_queue = mad_list->mad_queue;
2437 qp_info = send_queue->qp_info;
2438
2439 retry:
2440 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2441 mad_send_wr->header_mapping,
2442 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2443 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2444 mad_send_wr->payload_mapping,
2445 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2446 queued_send_wr = NULL;
2447 spin_lock_irqsave(&send_queue->lock, flags);
2448 list_del(&mad_list->list);
2449
2450 /* Move queued send to the send queue */
2451 if (send_queue->count-- > send_queue->max_active) {
2452 mad_list = container_of(qp_info->overflow_list.next,
2453 struct ib_mad_list_head, list);
2454 queued_send_wr = container_of(mad_list,
2455 struct ib_mad_send_wr_private,
2456 mad_list);
2457 list_move_tail(&mad_list->list, &send_queue->list);
2458 }
2459 spin_unlock_irqrestore(&send_queue->lock, flags);
2460
2461 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2462 mad_send_wc.status = wc->status;
2463 mad_send_wc.vendor_err = wc->vendor_err;
2464 if (atomic_read(&qp_info->snoop_count))
2465 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2466 IB_MAD_SNOOP_SEND_COMPLETIONS);
2467 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2468
2469 if (queued_send_wr) {
2470 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2471 &bad_send_wr);
2472 if (ret) {
2473 dev_err(&port_priv->device->dev,
2474 "ib_post_send failed: %d\n", ret);
2475 mad_send_wr = queued_send_wr;
2476 wc->status = IB_WC_LOC_QP_OP_ERR;
2477 goto retry;
2478 }
2479 }
2480 }
2481
2482 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2483 {
2484 struct ib_mad_send_wr_private *mad_send_wr;
2485 struct ib_mad_list_head *mad_list;
2486 unsigned long flags;
2487
2488 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2489 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2490 mad_send_wr = container_of(mad_list,
2491 struct ib_mad_send_wr_private,
2492 mad_list);
2493 mad_send_wr->retry = 1;
2494 }
2495 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2496 }
2497
2498 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2499 struct ib_wc *wc)
2500 {
2501 struct ib_mad_list_head *mad_list;
2502 struct ib_mad_qp_info *qp_info;
2503 struct ib_mad_send_wr_private *mad_send_wr;
2504 int ret;
2505
2506 /* Determine if failure was a send or receive */
2507 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2508 qp_info = mad_list->mad_queue->qp_info;
2509 if (mad_list->mad_queue == &qp_info->recv_queue)
2510 /*
2511 * Receive errors indicate that the QP has entered the error
2512 * state - error handling/shutdown code will cleanup
2513 */
2514 return;
2515
2516 /*
2517 * Send errors will transition the QP to SQE - move
2518 * QP to RTS and repost flushed work requests
2519 */
2520 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2521 mad_list);
2522 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2523 if (mad_send_wr->retry) {
2524 /* Repost send */
2525 struct ib_send_wr *bad_send_wr;
2526
2527 mad_send_wr->retry = 0;
2528 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2529 &bad_send_wr);
2530 if (ret)
2531 ib_mad_send_done_handler(port_priv, wc);
2532 } else
2533 ib_mad_send_done_handler(port_priv, wc);
2534 } else {
2535 struct ib_qp_attr *attr;
2536
2537 /* Transition QP to RTS and fail offending send */
2538 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2539 if (attr) {
2540 attr->qp_state = IB_QPS_RTS;
2541 attr->cur_qp_state = IB_QPS_SQE;
2542 ret = ib_modify_qp(qp_info->qp, attr,
2543 IB_QP_STATE | IB_QP_CUR_STATE);
2544 kfree(attr);
2545 if (ret)
2546 dev_err(&port_priv->device->dev,
2547 "mad_error_handler - ib_modify_qp to RTS : %d\n",
2548 ret);
2549 else
2550 mark_sends_for_retry(qp_info);
2551 }
2552 ib_mad_send_done_handler(port_priv, wc);
2553 }
2554 }
2555
2556 /*
2557 * IB MAD completion callback
2558 */
2559 static void ib_mad_completion_handler(struct work_struct *work)
2560 {
2561 struct ib_mad_port_private *port_priv;
2562 struct ib_wc wc;
2563
2564 port_priv = container_of(work, struct ib_mad_port_private, work);
2565 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2566
2567 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2568 if (wc.status == IB_WC_SUCCESS) {
2569 switch (wc.opcode) {
2570 case IB_WC_SEND:
2571 ib_mad_send_done_handler(port_priv, &wc);
2572 break;
2573 case IB_WC_RECV:
2574 ib_mad_recv_done_handler(port_priv, &wc);
2575 break;
2576 default:
2577 BUG_ON(1);
2578 break;
2579 }
2580 } else
2581 mad_error_handler(port_priv, &wc);
2582 }
2583 }
2584
2585 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2586 {
2587 unsigned long flags;
2588 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2589 struct ib_mad_send_wc mad_send_wc;
2590 struct list_head cancel_list;
2591
2592 INIT_LIST_HEAD(&cancel_list);
2593
2594 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2595 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2596 &mad_agent_priv->send_list, agent_list) {
2597 if (mad_send_wr->status == IB_WC_SUCCESS) {
2598 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2599 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2600 }
2601 }
2602
2603 /* Empty wait list to prevent receives from finding a request */
2604 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2605 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2606
2607 /* Report all cancelled requests */
2608 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2609 mad_send_wc.vendor_err = 0;
2610
2611 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2612 &cancel_list, agent_list) {
2613 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2614 list_del(&mad_send_wr->agent_list);
2615 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2616 &mad_send_wc);
2617 atomic_dec(&mad_agent_priv->refcount);
2618 }
2619 }
2620
2621 static struct ib_mad_send_wr_private*
2622 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2623 struct ib_mad_send_buf *send_buf)
2624 {
2625 struct ib_mad_send_wr_private *mad_send_wr;
2626
2627 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2628 agent_list) {
2629 if (&mad_send_wr->send_buf == send_buf)
2630 return mad_send_wr;
2631 }
2632
2633 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2634 agent_list) {
2635 if (is_rmpp_data_mad(mad_agent_priv,
2636 mad_send_wr->send_buf.mad) &&
2637 &mad_send_wr->send_buf == send_buf)
2638 return mad_send_wr;
2639 }
2640 return NULL;
2641 }
2642
2643 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2644 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2645 {
2646 struct ib_mad_agent_private *mad_agent_priv;
2647 struct ib_mad_send_wr_private *mad_send_wr;
2648 unsigned long flags;
2649 int active;
2650
2651 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2652 agent);
2653 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2654 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2655 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2656 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2657 return -EINVAL;
2658 }
2659
2660 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2661 if (!timeout_ms) {
2662 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2663 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2664 }
2665
2666 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2667 if (active)
2668 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2669 else
2670 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2671
2672 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2673 return 0;
2674 }
2675 EXPORT_SYMBOL(ib_modify_mad);
2676
2677 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2678 struct ib_mad_send_buf *send_buf)
2679 {
2680 ib_modify_mad(mad_agent, send_buf, 0);
2681 }
2682 EXPORT_SYMBOL(ib_cancel_mad);
2683
2684 static void local_completions(struct work_struct *work)
2685 {
2686 struct ib_mad_agent_private *mad_agent_priv;
2687 struct ib_mad_local_private *local;
2688 struct ib_mad_agent_private *recv_mad_agent;
2689 unsigned long flags;
2690 int free_mad;
2691 struct ib_wc wc;
2692 struct ib_mad_send_wc mad_send_wc;
2693 bool opa;
2694
2695 mad_agent_priv =
2696 container_of(work, struct ib_mad_agent_private, local_work);
2697
2698 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2699 mad_agent_priv->qp_info->port_priv->port_num);
2700
2701 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2702 while (!list_empty(&mad_agent_priv->local_list)) {
2703 local = list_entry(mad_agent_priv->local_list.next,
2704 struct ib_mad_local_private,
2705 completion_list);
2706 list_del(&local->completion_list);
2707 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2708 free_mad = 0;
2709 if (local->mad_priv) {
2710 u8 base_version;
2711 recv_mad_agent = local->recv_mad_agent;
2712 if (!recv_mad_agent) {
2713 dev_err(&mad_agent_priv->agent.device->dev,
2714 "No receive MAD agent for local completion\n");
2715 free_mad = 1;
2716 goto local_send_completion;
2717 }
2718
2719 /*
2720 * Defined behavior is to complete response
2721 * before request
2722 */
2723 build_smp_wc(recv_mad_agent->agent.qp,
2724 (unsigned long) local->mad_send_wr,
2725 be16_to_cpu(IB_LID_PERMISSIVE),
2726 local->mad_send_wr->send_wr.wr.ud.pkey_index,
2727 recv_mad_agent->agent.port_num, &wc);
2728
2729 local->mad_priv->header.recv_wc.wc = &wc;
2730
2731 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2732 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2733 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2734 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2735 } else {
2736 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2737 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2738 }
2739
2740 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2741 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2742 &local->mad_priv->header.recv_wc.rmpp_list);
2743 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2744 local->mad_priv->header.recv_wc.recv_buf.mad =
2745 (struct ib_mad *)local->mad_priv->mad;
2746 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2747 snoop_recv(recv_mad_agent->qp_info,
2748 &local->mad_priv->header.recv_wc,
2749 IB_MAD_SNOOP_RECVS);
2750 recv_mad_agent->agent.recv_handler(
2751 &recv_mad_agent->agent,
2752 &local->mad_priv->header.recv_wc);
2753 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2754 atomic_dec(&recv_mad_agent->refcount);
2755 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2756 }
2757
2758 local_send_completion:
2759 /* Complete send */
2760 mad_send_wc.status = IB_WC_SUCCESS;
2761 mad_send_wc.vendor_err = 0;
2762 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2763 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2764 snoop_send(mad_agent_priv->qp_info,
2765 &local->mad_send_wr->send_buf,
2766 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2767 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2768 &mad_send_wc);
2769
2770 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2771 atomic_dec(&mad_agent_priv->refcount);
2772 if (free_mad)
2773 kfree(local->mad_priv);
2774 kfree(local);
2775 }
2776 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2777 }
2778
2779 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2780 {
2781 int ret;
2782
2783 if (!mad_send_wr->retries_left)
2784 return -ETIMEDOUT;
2785
2786 mad_send_wr->retries_left--;
2787 mad_send_wr->send_buf.retries++;
2788
2789 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2790
2791 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2792 ret = ib_retry_rmpp(mad_send_wr);
2793 switch (ret) {
2794 case IB_RMPP_RESULT_UNHANDLED:
2795 ret = ib_send_mad(mad_send_wr);
2796 break;
2797 case IB_RMPP_RESULT_CONSUMED:
2798 ret = 0;
2799 break;
2800 default:
2801 ret = -ECOMM;
2802 break;
2803 }
2804 } else
2805 ret = ib_send_mad(mad_send_wr);
2806
2807 if (!ret) {
2808 mad_send_wr->refcount++;
2809 list_add_tail(&mad_send_wr->agent_list,
2810 &mad_send_wr->mad_agent_priv->send_list);
2811 }
2812 return ret;
2813 }
2814
2815 static void timeout_sends(struct work_struct *work)
2816 {
2817 struct ib_mad_agent_private *mad_agent_priv;
2818 struct ib_mad_send_wr_private *mad_send_wr;
2819 struct ib_mad_send_wc mad_send_wc;
2820 unsigned long flags, delay;
2821
2822 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2823 timed_work.work);
2824 mad_send_wc.vendor_err = 0;
2825
2826 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2827 while (!list_empty(&mad_agent_priv->wait_list)) {
2828 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2829 struct ib_mad_send_wr_private,
2830 agent_list);
2831
2832 if (time_after(mad_send_wr->timeout, jiffies)) {
2833 delay = mad_send_wr->timeout - jiffies;
2834 if ((long)delay <= 0)
2835 delay = 1;
2836 queue_delayed_work(mad_agent_priv->qp_info->
2837 port_priv->wq,
2838 &mad_agent_priv->timed_work, delay);
2839 break;
2840 }
2841
2842 list_del(&mad_send_wr->agent_list);
2843 if (mad_send_wr->status == IB_WC_SUCCESS &&
2844 !retry_send(mad_send_wr))
2845 continue;
2846
2847 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2848
2849 if (mad_send_wr->status == IB_WC_SUCCESS)
2850 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2851 else
2852 mad_send_wc.status = mad_send_wr->status;
2853 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2854 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2855 &mad_send_wc);
2856
2857 atomic_dec(&mad_agent_priv->refcount);
2858 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2859 }
2860 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2861 }
2862
2863 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2864 {
2865 struct ib_mad_port_private *port_priv = cq->cq_context;
2866 unsigned long flags;
2867
2868 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2869 if (!list_empty(&port_priv->port_list))
2870 queue_work(port_priv->wq, &port_priv->work);
2871 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2872 }
2873
2874 /*
2875 * Allocate receive MADs and post receive WRs for them
2876 */
2877 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2878 struct ib_mad_private *mad)
2879 {
2880 unsigned long flags;
2881 int post, ret;
2882 struct ib_mad_private *mad_priv;
2883 struct ib_sge sg_list;
2884 struct ib_recv_wr recv_wr, *bad_recv_wr;
2885 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2886
2887 /* Initialize common scatter list fields */
2888 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2889
2890 /* Initialize common receive WR fields */
2891 recv_wr.next = NULL;
2892 recv_wr.sg_list = &sg_list;
2893 recv_wr.num_sge = 1;
2894
2895 do {
2896 /* Allocate and map receive buffer */
2897 if (mad) {
2898 mad_priv = mad;
2899 mad = NULL;
2900 } else {
2901 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2902 GFP_ATOMIC);
2903 if (!mad_priv) {
2904 dev_err(&qp_info->port_priv->device->dev,
2905 "No memory for receive buffer\n");
2906 ret = -ENOMEM;
2907 break;
2908 }
2909 }
2910 sg_list.length = mad_priv_dma_size(mad_priv);
2911 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2912 &mad_priv->grh,
2913 mad_priv_dma_size(mad_priv),
2914 DMA_FROM_DEVICE);
2915 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2916 sg_list.addr))) {
2917 ret = -ENOMEM;
2918 break;
2919 }
2920 mad_priv->header.mapping = sg_list.addr;
2921 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2922 mad_priv->header.mad_list.mad_queue = recv_queue;
2923
2924 /* Post receive WR */
2925 spin_lock_irqsave(&recv_queue->lock, flags);
2926 post = (++recv_queue->count < recv_queue->max_active);
2927 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2928 spin_unlock_irqrestore(&recv_queue->lock, flags);
2929 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2930 if (ret) {
2931 spin_lock_irqsave(&recv_queue->lock, flags);
2932 list_del(&mad_priv->header.mad_list.list);
2933 recv_queue->count--;
2934 spin_unlock_irqrestore(&recv_queue->lock, flags);
2935 ib_dma_unmap_single(qp_info->port_priv->device,
2936 mad_priv->header.mapping,
2937 mad_priv_dma_size(mad_priv),
2938 DMA_FROM_DEVICE);
2939 kfree(mad_priv);
2940 dev_err(&qp_info->port_priv->device->dev,
2941 "ib_post_recv failed: %d\n", ret);
2942 break;
2943 }
2944 } while (post);
2945
2946 return ret;
2947 }
2948
2949 /*
2950 * Return all the posted receive MADs
2951 */
2952 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2953 {
2954 struct ib_mad_private_header *mad_priv_hdr;
2955 struct ib_mad_private *recv;
2956 struct ib_mad_list_head *mad_list;
2957
2958 if (!qp_info->qp)
2959 return;
2960
2961 while (!list_empty(&qp_info->recv_queue.list)) {
2962
2963 mad_list = list_entry(qp_info->recv_queue.list.next,
2964 struct ib_mad_list_head, list);
2965 mad_priv_hdr = container_of(mad_list,
2966 struct ib_mad_private_header,
2967 mad_list);
2968 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2969 header);
2970
2971 /* Remove from posted receive MAD list */
2972 list_del(&mad_list->list);
2973
2974 ib_dma_unmap_single(qp_info->port_priv->device,
2975 recv->header.mapping,
2976 mad_priv_dma_size(recv),
2977 DMA_FROM_DEVICE);
2978 kfree(recv);
2979 }
2980
2981 qp_info->recv_queue.count = 0;
2982 }
2983
2984 /*
2985 * Start the port
2986 */
2987 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2988 {
2989 int ret, i;
2990 struct ib_qp_attr *attr;
2991 struct ib_qp *qp;
2992 u16 pkey_index;
2993
2994 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2995 if (!attr) {
2996 dev_err(&port_priv->device->dev,
2997 "Couldn't kmalloc ib_qp_attr\n");
2998 return -ENOMEM;
2999 }
3000
3001 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
3002 IB_DEFAULT_PKEY_FULL, &pkey_index);
3003 if (ret)
3004 pkey_index = 0;
3005
3006 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3007 qp = port_priv->qp_info[i].qp;
3008 if (!qp)
3009 continue;
3010
3011 /*
3012 * PKey index for QP1 is irrelevant but
3013 * one is needed for the Reset to Init transition
3014 */
3015 attr->qp_state = IB_QPS_INIT;
3016 attr->pkey_index = pkey_index;
3017 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3018 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3019 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3020 if (ret) {
3021 dev_err(&port_priv->device->dev,
3022 "Couldn't change QP%d state to INIT: %d\n",
3023 i, ret);
3024 goto out;
3025 }
3026
3027 attr->qp_state = IB_QPS_RTR;
3028 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3029 if (ret) {
3030 dev_err(&port_priv->device->dev,
3031 "Couldn't change QP%d state to RTR: %d\n",
3032 i, ret);
3033 goto out;
3034 }
3035
3036 attr->qp_state = IB_QPS_RTS;
3037 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3038 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3039 if (ret) {
3040 dev_err(&port_priv->device->dev,
3041 "Couldn't change QP%d state to RTS: %d\n",
3042 i, ret);
3043 goto out;
3044 }
3045 }
3046
3047 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3048 if (ret) {
3049 dev_err(&port_priv->device->dev,
3050 "Failed to request completion notification: %d\n",
3051 ret);
3052 goto out;
3053 }
3054
3055 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3056 if (!port_priv->qp_info[i].qp)
3057 continue;
3058
3059 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3060 if (ret) {
3061 dev_err(&port_priv->device->dev,
3062 "Couldn't post receive WRs\n");
3063 goto out;
3064 }
3065 }
3066 out:
3067 kfree(attr);
3068 return ret;
3069 }
3070
3071 static void qp_event_handler(struct ib_event *event, void *qp_context)
3072 {
3073 struct ib_mad_qp_info *qp_info = qp_context;
3074
3075 /* It's worse than that! He's dead, Jim! */
3076 dev_err(&qp_info->port_priv->device->dev,
3077 "Fatal error (%d) on MAD QP (%d)\n",
3078 event->event, qp_info->qp->qp_num);
3079 }
3080
3081 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3082 struct ib_mad_queue *mad_queue)
3083 {
3084 mad_queue->qp_info = qp_info;
3085 mad_queue->count = 0;
3086 spin_lock_init(&mad_queue->lock);
3087 INIT_LIST_HEAD(&mad_queue->list);
3088 }
3089
3090 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3091 struct ib_mad_qp_info *qp_info)
3092 {
3093 qp_info->port_priv = port_priv;
3094 init_mad_queue(qp_info, &qp_info->send_queue);
3095 init_mad_queue(qp_info, &qp_info->recv_queue);
3096 INIT_LIST_HEAD(&qp_info->overflow_list);
3097 spin_lock_init(&qp_info->snoop_lock);
3098 qp_info->snoop_table = NULL;
3099 qp_info->snoop_table_size = 0;
3100 atomic_set(&qp_info->snoop_count, 0);
3101 }
3102
3103 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3104 enum ib_qp_type qp_type)
3105 {
3106 struct ib_qp_init_attr qp_init_attr;
3107 int ret;
3108
3109 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3110 qp_init_attr.send_cq = qp_info->port_priv->cq;
3111 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3112 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3113 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3114 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3115 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3116 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3117 qp_init_attr.qp_type = qp_type;
3118 qp_init_attr.port_num = qp_info->port_priv->port_num;
3119 qp_init_attr.qp_context = qp_info;
3120 qp_init_attr.event_handler = qp_event_handler;
3121 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3122 if (IS_ERR(qp_info->qp)) {
3123 dev_err(&qp_info->port_priv->device->dev,
3124 "Couldn't create ib_mad QP%d\n",
3125 get_spl_qp_index(qp_type));
3126 ret = PTR_ERR(qp_info->qp);
3127 goto error;
3128 }
3129 /* Use minimum queue sizes unless the CQ is resized */
3130 qp_info->send_queue.max_active = mad_sendq_size;
3131 qp_info->recv_queue.max_active = mad_recvq_size;
3132 return 0;
3133
3134 error:
3135 return ret;
3136 }
3137
3138 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3139 {
3140 if (!qp_info->qp)
3141 return;
3142
3143 ib_destroy_qp(qp_info->qp);
3144 kfree(qp_info->snoop_table);
3145 }
3146
3147 /*
3148 * Open the port
3149 * Create the QP, PD, MR, and CQ if needed
3150 */
3151 static int ib_mad_port_open(struct ib_device *device,
3152 int port_num)
3153 {
3154 int ret, cq_size;
3155 struct ib_mad_port_private *port_priv;
3156 unsigned long flags;
3157 char name[sizeof "ib_mad123"];
3158 int has_smi;
3159 struct ib_cq_init_attr cq_attr = {};
3160
3161 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3162 return -EFAULT;
3163
3164 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3165 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3166 return -EFAULT;
3167
3168 /* Create new device info */
3169 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3170 if (!port_priv) {
3171 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
3172 return -ENOMEM;
3173 }
3174
3175 port_priv->device = device;
3176 port_priv->port_num = port_num;
3177 spin_lock_init(&port_priv->reg_lock);
3178 INIT_LIST_HEAD(&port_priv->agent_list);
3179 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3180 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3181
3182 cq_size = mad_sendq_size + mad_recvq_size;
3183 has_smi = rdma_cap_ib_smi(device, port_num);
3184 if (has_smi)
3185 cq_size *= 2;
3186
3187 cq_attr.cqe = cq_size;
3188 port_priv->cq = ib_create_cq(port_priv->device,
3189 ib_mad_thread_completion_handler,
3190 NULL, port_priv, &cq_attr);
3191 if (IS_ERR(port_priv->cq)) {
3192 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3193 ret = PTR_ERR(port_priv->cq);
3194 goto error3;
3195 }
3196
3197 port_priv->pd = ib_alloc_pd(device);
3198 if (IS_ERR(port_priv->pd)) {
3199 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3200 ret = PTR_ERR(port_priv->pd);
3201 goto error4;
3202 }
3203
3204 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
3205 if (IS_ERR(port_priv->mr)) {
3206 dev_err(&device->dev, "Couldn't get ib_mad DMA MR\n");
3207 ret = PTR_ERR(port_priv->mr);
3208 goto error5;
3209 }
3210
3211 if (has_smi) {
3212 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3213 if (ret)
3214 goto error6;
3215 }
3216 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3217 if (ret)
3218 goto error7;
3219
3220 snprintf(name, sizeof name, "ib_mad%d", port_num);
3221 port_priv->wq = create_singlethread_workqueue(name);
3222 if (!port_priv->wq) {
3223 ret = -ENOMEM;
3224 goto error8;
3225 }
3226 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
3227
3228 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3229 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3230 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3231
3232 ret = ib_mad_port_start(port_priv);
3233 if (ret) {
3234 dev_err(&device->dev, "Couldn't start port\n");
3235 goto error9;
3236 }
3237
3238 return 0;
3239
3240 error9:
3241 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3242 list_del_init(&port_priv->port_list);
3243 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3244
3245 destroy_workqueue(port_priv->wq);
3246 error8:
3247 destroy_mad_qp(&port_priv->qp_info[1]);
3248 error7:
3249 destroy_mad_qp(&port_priv->qp_info[0]);
3250 error6:
3251 ib_dereg_mr(port_priv->mr);
3252 error5:
3253 ib_dealloc_pd(port_priv->pd);
3254 error4:
3255 ib_destroy_cq(port_priv->cq);
3256 cleanup_recv_queue(&port_priv->qp_info[1]);
3257 cleanup_recv_queue(&port_priv->qp_info[0]);
3258 error3:
3259 kfree(port_priv);
3260
3261 return ret;
3262 }
3263
3264 /*
3265 * Close the port
3266 * If there are no classes using the port, free the port
3267 * resources (CQ, MR, PD, QP) and remove the port's info structure
3268 */
3269 static int ib_mad_port_close(struct ib_device *device, int port_num)
3270 {
3271 struct ib_mad_port_private *port_priv;
3272 unsigned long flags;
3273
3274 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3275 port_priv = __ib_get_mad_port(device, port_num);
3276 if (port_priv == NULL) {
3277 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3278 dev_err(&device->dev, "Port %d not found\n", port_num);
3279 return -ENODEV;
3280 }
3281 list_del_init(&port_priv->port_list);
3282 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3283
3284 destroy_workqueue(port_priv->wq);
3285 destroy_mad_qp(&port_priv->qp_info[1]);
3286 destroy_mad_qp(&port_priv->qp_info[0]);
3287 ib_dereg_mr(port_priv->mr);
3288 ib_dealloc_pd(port_priv->pd);
3289 ib_destroy_cq(port_priv->cq);
3290 cleanup_recv_queue(&port_priv->qp_info[1]);
3291 cleanup_recv_queue(&port_priv->qp_info[0]);
3292 /* XXX: Handle deallocation of MAD registration tables */
3293
3294 kfree(port_priv);
3295
3296 return 0;
3297 }
3298
3299 static void ib_mad_init_device(struct ib_device *device)
3300 {
3301 int start, i;
3302
3303 start = rdma_start_port(device);
3304
3305 for (i = start; i <= rdma_end_port(device); i++) {
3306 if (!rdma_cap_ib_mad(device, i))
3307 continue;
3308
3309 if (ib_mad_port_open(device, i)) {
3310 dev_err(&device->dev, "Couldn't open port %d\n", i);
3311 goto error;
3312 }
3313 if (ib_agent_port_open(device, i)) {
3314 dev_err(&device->dev,
3315 "Couldn't open port %d for agents\n", i);
3316 goto error_agent;
3317 }
3318 }
3319 return;
3320
3321 error_agent:
3322 if (ib_mad_port_close(device, i))
3323 dev_err(&device->dev, "Couldn't close port %d\n", i);
3324
3325 error:
3326 while (--i >= start) {
3327 if (!rdma_cap_ib_mad(device, i))
3328 continue;
3329
3330 if (ib_agent_port_close(device, i))
3331 dev_err(&device->dev,
3332 "Couldn't close port %d for agents\n", i);
3333 if (ib_mad_port_close(device, i))
3334 dev_err(&device->dev, "Couldn't close port %d\n", i);
3335 }
3336 }
3337
3338 static void ib_mad_remove_device(struct ib_device *device)
3339 {
3340 int i;
3341
3342 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3343 if (!rdma_cap_ib_mad(device, i))
3344 continue;
3345
3346 if (ib_agent_port_close(device, i))
3347 dev_err(&device->dev,
3348 "Couldn't close port %d for agents\n", i);
3349 if (ib_mad_port_close(device, i))
3350 dev_err(&device->dev, "Couldn't close port %d\n", i);
3351 }
3352 }
3353
3354 static struct ib_client mad_client = {
3355 .name = "mad",
3356 .add = ib_mad_init_device,
3357 .remove = ib_mad_remove_device
3358 };
3359
3360 static int __init ib_mad_init_module(void)
3361 {
3362 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3363 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3364
3365 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3366 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3367
3368 INIT_LIST_HEAD(&ib_mad_port_list);
3369
3370 if (ib_register_client(&mad_client)) {
3371 pr_err("Couldn't register ib_mad client\n");
3372 return -EINVAL;
3373 }
3374
3375 return 0;
3376 }
3377
3378 static void __exit ib_mad_cleanup_module(void)
3379 {
3380 ib_unregister_client(&mad_client);
3381 }
3382
3383 module_init(ib_mad_init_module);
3384 module_exit(ib_mad_cleanup_module);
Linux with added FPC-III support