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IB/mad: Remove redundant NULL pointer check in ib_mad_recv_done_handler()
[linux-2.6-block.git] / drivers / infiniband / core / mad.c
CommitLineData
1da177e4 1/*
de493d47 2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
fa619a77
HR		 3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
1da177e4
LT		 5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
1da177e4 34 */
1da177e4 35#include <linux/dma-mapping.h>
9874e746 36#include <rdma/ib_cache.h>
1da177e4
LT		 37
38#include "mad_priv.h"
fa619a77 39#include "mad_rmpp.h"
1da177e4
LT		 40#include "smi.h"
41#include "agent.h"
42
43MODULE_LICENSE("Dual BSD/GPL");
44MODULE_DESCRIPTION("kernel IB MAD API");
45MODULE_AUTHOR("Hal Rosenstock");
46MODULE_AUTHOR("Sean Hefty");
47
e54f8188 48static struct kmem_cache *ib_mad_cache;
fa619a77 49
1da177e4
LT		 50static struct list_head ib_mad_port_list;
51static u32 ib_mad_client_id = 0;
52
53/* Port list lock */
54static spinlock_t ib_mad_port_list_lock;
55
56
57/* Forward declarations */
58static int method_in_use(struct ib_mad_mgmt_method_table **method,
59 struct ib_mad_reg_req *mad_reg_req);
60static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
61static struct ib_mad_agent_private *find_mad_agent(
62 struct ib_mad_port_private *port_priv,
4a0754fa 63 struct ib_mad *mad);
1da177e4
LT		 64static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
65 struct ib_mad_private *mad);
66static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
c4028958
DH		 67static void timeout_sends(struct work_struct *work);
68static void local_completions(struct work_struct *work);
1da177e4
LT		 69static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
70 struct ib_mad_agent_private *agent_priv,
71 u8 mgmt_class);
72static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
73 struct ib_mad_agent_private *agent_priv);
74
75/*
76 * Returns a ib_mad_port_private structure or NULL for a device/port
77 * Assumes ib_mad_port_list_lock is being held
78 */
79static inline struct ib_mad_port_private *
80__ib_get_mad_port(struct ib_device *device, int port_num)
81{
82 struct ib_mad_port_private *entry;
83
84 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
85 if (entry->device == device && entry->port_num == port_num)
86 return entry;
87 }
88 return NULL;
89}
90
91/*
92 * Wrapper function to return a ib_mad_port_private structure or NULL
93 * for a device/port
94 */
95static inline struct ib_mad_port_private *
96ib_get_mad_port(struct ib_device *device, int port_num)
97{
98 struct ib_mad_port_private *entry;
99 unsigned long flags;
100
101 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
102 entry = __ib_get_mad_port(device, port_num);
103 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
104
105 return entry;
106}
107
108static inline u8 convert_mgmt_class(u8 mgmt_class)
109{
110 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
111 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
112 0 : mgmt_class;
113}
114
115static int get_spl_qp_index(enum ib_qp_type qp_type)
116{
117 switch (qp_type)
118 {
119 case IB_QPT_SMI:
120 return 0;
121 case IB_QPT_GSI:
122 return 1;
123 default:
124 return -1;
125 }
126}
127
128static int vendor_class_index(u8 mgmt_class)
129{
130 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
131}
132
133static int is_vendor_class(u8 mgmt_class)
134{
135 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
136 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
137 return 0;
138 return 1;
139}
140
141static int is_vendor_oui(char *oui)
142{
143 if (oui[0] || oui[1] || oui[2])
144 return 1;
145 return 0;
146}
147
148static int is_vendor_method_in_use(
149 struct ib_mad_mgmt_vendor_class *vendor_class,
150 struct ib_mad_reg_req *mad_reg_req)
151{
152 struct ib_mad_mgmt_method_table *method;
153 int i;
154
155 for (i = 0; i < MAX_MGMT_OUI; i++) {
156 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
157 method = vendor_class->method_table[i];
158 if (method) {
159 if (method_in_use(&method, mad_reg_req))
160 return 1;
161 else
162 break;
163 }
164 }
165 }
166 return 0;
167}
168
2527e681
SH		 169int ib_response_mad(struct ib_mad *mad)
170{
171 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
172 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
173 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
174 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
175}
176EXPORT_SYMBOL(ib_response_mad);
177
1da177e4
LT		 178/*
179 * ib_register_mad_agent - Register to send/receive MADs
180 */
181struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
182 u8 port_num,
183 enum ib_qp_type qp_type,
184 struct ib_mad_reg_req *mad_reg_req,
185 u8 rmpp_version,
186 ib_mad_send_handler send_handler,
187 ib_mad_recv_handler recv_handler,
188 void *context)
189{
190 struct ib_mad_port_private *port_priv;
191 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
192 struct ib_mad_agent_private *mad_agent_priv;
193 struct ib_mad_reg_req *reg_req = NULL;
194 struct ib_mad_mgmt_class_table *class;
195 struct ib_mad_mgmt_vendor_class_table *vendor;
196 struct ib_mad_mgmt_vendor_class *vendor_class;
197 struct ib_mad_mgmt_method_table *method;
198 int ret2, qpn;
199 unsigned long flags;
200 u8 mgmt_class, vclass;
201
202 /* Validate parameters */
203 qpn = get_spl_qp_index(qp_type);
204 if (qpn == -1)
205 goto error1;
206
fa619a77
HR		 207 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
208 goto error1;
1da177e4
LT		 209
210 /* Validate MAD registration request if supplied */
211 if (mad_reg_req) {
212 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
213 goto error1;
214 if (!recv_handler)
215 goto error1;
216 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
217 /*
218 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
219 * one in this range currently allowed
220 */
221 if (mad_reg_req->mgmt_class !=
222 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
223 goto error1;
224 } else if (mad_reg_req->mgmt_class == 0) {
225 /*
226 * Class 0 is reserved in IBA and is used for
227 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
228 */
229 goto error1;
230 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
231 /*
232 * If class is in "new" vendor range,
233 * ensure supplied OUI is not zero
234 */
235 if (!is_vendor_oui(mad_reg_req->oui))
236 goto error1;
237 }
618a3c03 238 /* Make sure class supplied is consistent with RMPP */
64cb9c6a 239 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
618a3c03
HR		 240 if (rmpp_version)
241 goto error1;
242 }
1da177e4
LT		 243 /* Make sure class supplied is consistent with QP type */
244 if (qp_type == IB_QPT_SMI) {
245 if ((mad_reg_req->mgmt_class !=
246 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
247 (mad_reg_req->mgmt_class !=
248 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
249 goto error1;
250 } else {
251 if ((mad_reg_req->mgmt_class ==
252 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
253 (mad_reg_req->mgmt_class ==
254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
255 goto error1;
256 }
257 } else {
258 /* No registration request supplied */
259 if (!send_handler)
260 goto error1;
261 }
262
263 /* Validate device and port */
264 port_priv = ib_get_mad_port(device, port_num);
265 if (!port_priv) {
266 ret = ERR_PTR(-ENODEV);
267 goto error1;
268 }
269
270 /* Allocate structures */
de6eb66b 271 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
1da177e4
LT		 272 if (!mad_agent_priv) {
273 ret = ERR_PTR(-ENOMEM);
274 goto error1;
275 }
b82cab6b
HR		 276
277 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
278 IB_ACCESS_LOCAL_WRITE);
279 if (IS_ERR(mad_agent_priv->agent.mr)) {
280 ret = ERR_PTR(-ENOMEM);
281 goto error2;
282 }
1da177e4
LT		 283
284 if (mad_reg_req) {
285 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
286 if (!reg_req) {
287 ret = ERR_PTR(-ENOMEM);
b82cab6b 288 goto error3;
1da177e4
LT		 289 }
290 /* Make a copy of the MAD registration request */
291 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
292 }
293
294 /* Now, fill in the various structures */
1da177e4
LT		 295 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
296 mad_agent_priv->reg_req = reg_req;
fa619a77 297 mad_agent_priv->agent.rmpp_version = rmpp_version;
1da177e4
LT		 298 mad_agent_priv->agent.device = device;
299 mad_agent_priv->agent.recv_handler = recv_handler;
300 mad_agent_priv->agent.send_handler = send_handler;
301 mad_agent_priv->agent.context = context;
302 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
303 mad_agent_priv->agent.port_num = port_num;
304
305 spin_lock_irqsave(&port_priv->reg_lock, flags);
306 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
307
308 /*
309 * Make sure MAD registration (if supplied)
310 * is non overlapping with any existing ones
311 */
312 if (mad_reg_req) {
313 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
314 if (!is_vendor_class(mgmt_class)) {
315 class = port_priv->version[mad_reg_req->
316 mgmt_class_version].class;
317 if (class) {
318 method = class->method_table[mgmt_class];
319 if (method) {
320 if (method_in_use(&method,
321 mad_reg_req))
b82cab6b 322 goto error4;
1da177e4
LT		 323 }
324 }
325 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
326 mgmt_class);
327 } else {
328 /* "New" vendor class range */
329 vendor = port_priv->version[mad_reg_req->
330 mgmt_class_version].vendor;
331 if (vendor) {
332 vclass = vendor_class_index(mgmt_class);
333 vendor_class = vendor->vendor_class[vclass];
334 if (vendor_class) {
335 if (is_vendor_method_in_use(
336 vendor_class,
337 mad_reg_req))
b82cab6b 338 goto error4;
1da177e4
LT		 339 }
340 }
341 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
342 }
343 if (ret2) {
344 ret = ERR_PTR(ret2);
b82cab6b 345 goto error4;
1da177e4
LT		 346 }
347 }
348
349 /* Add mad agent into port's agent list */
350 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
351 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
352
353 spin_lock_init(&mad_agent_priv->lock);
354 INIT_LIST_HEAD(&mad_agent_priv->send_list);
355 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
6a0c435e 356 INIT_LIST_HEAD(&mad_agent_priv->done_list);
fa619a77 357 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
c4028958 358 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
1da177e4 359 INIT_LIST_HEAD(&mad_agent_priv->local_list);
c4028958 360 INIT_WORK(&mad_agent_priv->local_work, local_completions);
1da177e4 361 atomic_set(&mad_agent_priv->refcount, 1);
1b52fa98 362 init_completion(&mad_agent_priv->comp);
1da177e4
LT		 363
364 return &mad_agent_priv->agent;
365
b82cab6b 366error4:
1da177e4
LT		 367 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
368 kfree(reg_req);
b82cab6b 369error3:
b82cab6b 370 ib_dereg_mr(mad_agent_priv->agent.mr);
2012a116
AB		 371error2:
372 kfree(mad_agent_priv);
1da177e4
LT		 373error1:
374 return ret;
375}
376EXPORT_SYMBOL(ib_register_mad_agent);
377
378static inline int is_snooping_sends(int mad_snoop_flags)
379{
380 return (mad_snoop_flags &
381 (/*IB_MAD_SNOOP_POSTED_SENDS |
382 IB_MAD_SNOOP_RMPP_SENDS |*/
383 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
384 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
385}
386
387static inline int is_snooping_recvs(int mad_snoop_flags)
388{
389 return (mad_snoop_flags &
390 (IB_MAD_SNOOP_RECVS /*|
391 IB_MAD_SNOOP_RMPP_RECVS*/));
392}
393
394static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
395 struct ib_mad_snoop_private *mad_snoop_priv)
396{
397 struct ib_mad_snoop_private **new_snoop_table;
398 unsigned long flags;
399 int i;
400
401 spin_lock_irqsave(&qp_info->snoop_lock, flags);
402 /* Check for empty slot in array. */
403 for (i = 0; i < qp_info->snoop_table_size; i++)
404 if (!qp_info->snoop_table[i])
405 break;
406
407 if (i == qp_info->snoop_table_size) {
408 /* Grow table. */
409 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
410 qp_info->snoop_table_size + 1,
411 GFP_ATOMIC);
412 if (!new_snoop_table) {
413 i = -ENOMEM;
414 goto out;
415 }
416 if (qp_info->snoop_table) {
417 memcpy(new_snoop_table, qp_info->snoop_table,
418 sizeof mad_snoop_priv *
419 qp_info->snoop_table_size);
420 kfree(qp_info->snoop_table);
421 }
422 qp_info->snoop_table = new_snoop_table;
423 qp_info->snoop_table_size++;
424 }
425 qp_info->snoop_table[i] = mad_snoop_priv;
426 atomic_inc(&qp_info->snoop_count);
427out:
428 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
429 return i;
430}
431
432struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
433 u8 port_num,
434 enum ib_qp_type qp_type,
435 int mad_snoop_flags,
436 ib_mad_snoop_handler snoop_handler,
437 ib_mad_recv_handler recv_handler,
438 void *context)
439{
440 struct ib_mad_port_private *port_priv;
441 struct ib_mad_agent *ret;
442 struct ib_mad_snoop_private *mad_snoop_priv;
443 int qpn;
444
445 /* Validate parameters */
446 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
447 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
448 ret = ERR_PTR(-EINVAL);
449 goto error1;
450 }
451 qpn = get_spl_qp_index(qp_type);
452 if (qpn == -1) {
453 ret = ERR_PTR(-EINVAL);
454 goto error1;
455 }
456 port_priv = ib_get_mad_port(device, port_num);
457 if (!port_priv) {
458 ret = ERR_PTR(-ENODEV);
459 goto error1;
460 }
461 /* Allocate structures */
de6eb66b 462 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
1da177e4
LT		 463 if (!mad_snoop_priv) {
464 ret = ERR_PTR(-ENOMEM);
465 goto error1;
466 }
467
468 /* Now, fill in the various structures */
1da177e4
LT		 469 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
470 mad_snoop_priv->agent.device = device;
471 mad_snoop_priv->agent.recv_handler = recv_handler;
472 mad_snoop_priv->agent.snoop_handler = snoop_handler;
473 mad_snoop_priv->agent.context = context;
474 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
475 mad_snoop_priv->agent.port_num = port_num;
476 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
1b52fa98 477 init_completion(&mad_snoop_priv->comp);
1da177e4
LT		 478 mad_snoop_priv->snoop_index = register_snoop_agent(
479 &port_priv->qp_info[qpn],
480 mad_snoop_priv);
481 if (mad_snoop_priv->snoop_index < 0) {
482 ret = ERR_PTR(mad_snoop_priv->snoop_index);
483 goto error2;
484 }
485
486 atomic_set(&mad_snoop_priv->refcount, 1);
487 return &mad_snoop_priv->agent;
488
489error2:
490 kfree(mad_snoop_priv);
491error1:
492 return ret;
493}
494EXPORT_SYMBOL(ib_register_mad_snoop);
495
1b52fa98
SH		 496static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
497{
498 if (atomic_dec_and_test(&mad_agent_priv->refcount))
499 complete(&mad_agent_priv->comp);
500}
501
502static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
503{
504 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
505 complete(&mad_snoop_priv->comp);
506}
507
1da177e4
LT		 508static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
509{
510 struct ib_mad_port_private *port_priv;
511 unsigned long flags;
512
513 /* Note that we could still be handling received MADs */
514
515 /*
516 * Canceling all sends results in dropping received response
517 * MADs, preventing us from queuing additional work
518 */
519 cancel_mads(mad_agent_priv);
1da177e4 520 port_priv = mad_agent_priv->qp_info->port_priv;
1da177e4 521 cancel_delayed_work(&mad_agent_priv->timed_work);
1da177e4
LT		 522
523 spin_lock_irqsave(&port_priv->reg_lock, flags);
524 remove_mad_reg_req(mad_agent_priv);
525 list_del(&mad_agent_priv->agent_list);
526 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
527
b82cab6b 528 flush_workqueue(port_priv->wq);
fa619a77 529 ib_cancel_rmpp_recvs(mad_agent_priv);
1da177e4 530
1b52fa98
SH		 531 deref_mad_agent(mad_agent_priv);
532 wait_for_completion(&mad_agent_priv->comp);
1da177e4 533
6044ec88 534 kfree(mad_agent_priv->reg_req);
b82cab6b 535 ib_dereg_mr(mad_agent_priv->agent.mr);
1da177e4
LT		 536 kfree(mad_agent_priv);
537}
538
539static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
540{
541 struct ib_mad_qp_info *qp_info;
542 unsigned long flags;
543
544 qp_info = mad_snoop_priv->qp_info;
545 spin_lock_irqsave(&qp_info->snoop_lock, flags);
546 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
547 atomic_dec(&qp_info->snoop_count);
548 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
549
1b52fa98
SH		 550 deref_snoop_agent(mad_snoop_priv);
551 wait_for_completion(&mad_snoop_priv->comp);
1da177e4
LT		 552
553 kfree(mad_snoop_priv);
554}
555
556/*
557 * ib_unregister_mad_agent - Unregisters a client from using MAD services
558 */
559int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
560{
561 struct ib_mad_agent_private *mad_agent_priv;
562 struct ib_mad_snoop_private *mad_snoop_priv;
563
564 /* If the TID is zero, the agent can only snoop. */
565 if (mad_agent->hi_tid) {
566 mad_agent_priv = container_of(mad_agent,
567 struct ib_mad_agent_private,
568 agent);
569 unregister_mad_agent(mad_agent_priv);
570 } else {
571 mad_snoop_priv = container_of(mad_agent,
572 struct ib_mad_snoop_private,
573 agent);
574 unregister_mad_snoop(mad_snoop_priv);
575 }
576 return 0;
577}
578EXPORT_SYMBOL(ib_unregister_mad_agent);
579
580static void dequeue_mad(struct ib_mad_list_head *mad_list)
581{
582 struct ib_mad_queue *mad_queue;
583 unsigned long flags;
584
585 BUG_ON(!mad_list->mad_queue);
586 mad_queue = mad_list->mad_queue;
587 spin_lock_irqsave(&mad_queue->lock, flags);
588 list_del(&mad_list->list);
589 mad_queue->count--;
590 spin_unlock_irqrestore(&mad_queue->lock, flags);
591}
592
593static void snoop_send(struct ib_mad_qp_info *qp_info,
34816ad9 594 struct ib_mad_send_buf *send_buf,
1da177e4
LT		 595 struct ib_mad_send_wc *mad_send_wc,
596 int mad_snoop_flags)
597{
598 struct ib_mad_snoop_private *mad_snoop_priv;
599 unsigned long flags;
600 int i;
601
602 spin_lock_irqsave(&qp_info->snoop_lock, flags);
603 for (i = 0; i < qp_info->snoop_table_size; i++) {
604 mad_snoop_priv = qp_info->snoop_table[i];
605 if (!mad_snoop_priv ||
606 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
607 continue;
608
609 atomic_inc(&mad_snoop_priv->refcount);
610 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
611 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
34816ad9 612 send_buf, mad_send_wc);
1b52fa98 613 deref_snoop_agent(mad_snoop_priv);
1da177e4
LT		 614 spin_lock_irqsave(&qp_info->snoop_lock, flags);
615 }
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617}
618
619static void snoop_recv(struct ib_mad_qp_info *qp_info,
620 struct ib_mad_recv_wc *mad_recv_wc,
621 int mad_snoop_flags)
622{
623 struct ib_mad_snoop_private *mad_snoop_priv;
624 unsigned long flags;
625 int i;
626
627 spin_lock_irqsave(&qp_info->snoop_lock, flags);
628 for (i = 0; i < qp_info->snoop_table_size; i++) {
629 mad_snoop_priv = qp_info->snoop_table[i];
630 if (!mad_snoop_priv ||
631 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
632 continue;
633
634 atomic_inc(&mad_snoop_priv->refcount);
635 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
636 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
637 mad_recv_wc);
1b52fa98 638 deref_snoop_agent(mad_snoop_priv);
1da177e4
LT		 639 spin_lock_irqsave(&qp_info->snoop_lock, flags);
640 }
641 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
642}
643
062dbb69
MT		 644static void build_smp_wc(struct ib_qp *qp,
645 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
1da177e4
LT		 646 struct ib_wc *wc)
647{
648 memset(wc, 0, sizeof *wc);
649 wc->wr_id = wr_id;
650 wc->status = IB_WC_SUCCESS;
651 wc->opcode = IB_WC_RECV;
652 wc->pkey_index = pkey_index;
653 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
654 wc->src_qp = IB_QP0;
062dbb69 655 wc->qp = qp;
1da177e4
LT		 656 wc->slid = slid;
657 wc->sl = 0;
658 wc->dlid_path_bits = 0;
659 wc->port_num = port_num;
660}
661
662/*
663 * Return 0 if SMP is to be sent
664 * Return 1 if SMP was consumed locally (whether or not solicited)
665 * Return < 0 if error
666 */
667static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
34816ad9 668 struct ib_mad_send_wr_private *mad_send_wr)
1da177e4 669{
de493d47 670 int ret = 0;
34816ad9 671 struct ib_smp *smp = mad_send_wr->send_buf.mad;
1da177e4
LT		 672 unsigned long flags;
673 struct ib_mad_local_private *local;
674 struct ib_mad_private *mad_priv;
675 struct ib_mad_port_private *port_priv;
676 struct ib_mad_agent_private *recv_mad_agent = NULL;
677 struct ib_device *device = mad_agent_priv->agent.device;
1bae4dbf 678 u8 port_num;
1da177e4 679 struct ib_wc mad_wc;
34816ad9 680 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
1da177e4 681
1bae4dbf
HR		 682 if (device->node_type == RDMA_NODE_IB_SWITCH &&
683 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
684 port_num = send_wr->wr.ud.port_num;
685 else
686 port_num = mad_agent_priv->agent.port_num;
687
8cf3f04f
RC		 688 /*
689 * Directed route handling starts if the initial LID routed part of
690 * a request or the ending LID routed part of a response is empty.
691 * If we are at the start of the LID routed part, don't update the
692 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
693 */
694 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
695 IB_LID_PERMISSIVE &&
de493d47
HR		 696 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
697 IB_SMI_DISCARD) {
1da177e4
LT		 698 ret = -EINVAL;
699 printk(KERN_ERR PFX "Invalid directed route\n");
700 goto out;
701 }
de493d47 702
1da177e4 703 /* Check to post send on QP or process locally */
de493d47 704 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD)
1da177e4
LT		 705 goto out;
706
707 local = kmalloc(sizeof *local, GFP_ATOMIC);
708 if (!local) {
709 ret = -ENOMEM;
710 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
711 goto out;
712 }
713 local->mad_priv = NULL;
714 local->recv_mad_agent = NULL;
715 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
716 if (!mad_priv) {
717 ret = -ENOMEM;
718 printk(KERN_ERR PFX "No memory for local response MAD\n");
719 kfree(local);
720 goto out;
721 }
722
062dbb69
MT		 723 build_smp_wc(mad_agent_priv->agent.qp,
724 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
97f52eb4 725 send_wr->wr.ud.pkey_index,
1da177e4
LT		 726 send_wr->wr.ud.port_num, &mad_wc);
727
728 /* No GRH for DR SMP */
729 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
730 (struct ib_mad *)smp,
731 (struct ib_mad *)&mad_priv->mad);
732 switch (ret)
733 {
734 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
2527e681 735 if (ib_response_mad(&mad_priv->mad.mad) &&
1da177e4
LT		 736 mad_agent_priv->agent.recv_handler) {
737 local->mad_priv = mad_priv;
738 local->recv_mad_agent = mad_agent_priv;
739 /*
740 * Reference MAD agent until receive
741 * side of local completion handled
742 */
743 atomic_inc(&mad_agent_priv->refcount);
744 } else
745 kmem_cache_free(ib_mad_cache, mad_priv);
746 break;
747 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
748 kmem_cache_free(ib_mad_cache, mad_priv);
749 break;
750 case IB_MAD_RESULT_SUCCESS:
751 /* Treat like an incoming receive MAD */
1da177e4
LT		 752 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
753 mad_agent_priv->agent.port_num);
754 if (port_priv) {
755 mad_priv->mad.mad.mad_hdr.tid =
756 ((struct ib_mad *)smp)->mad_hdr.tid;
757 recv_mad_agent = find_mad_agent(port_priv,
4a0754fa 758 &mad_priv->mad.mad);
1da177e4
LT		 759 }
760 if (!port_priv || !recv_mad_agent) {
761 kmem_cache_free(ib_mad_cache, mad_priv);
762 kfree(local);
763 ret = 0;
764 goto out;
765 }
766 local->mad_priv = mad_priv;
767 local->recv_mad_agent = recv_mad_agent;
768 break;
769 default:
770 kmem_cache_free(ib_mad_cache, mad_priv);
771 kfree(local);
772 ret = -EINVAL;
773 goto out;
774 }
775
34816ad9 776 local->mad_send_wr = mad_send_wr;
1da177e4
LT		 777 /* Reference MAD agent until send side of local completion handled */
778 atomic_inc(&mad_agent_priv->refcount);
779 /* Queue local completion to local list */
780 spin_lock_irqsave(&mad_agent_priv->lock, flags);
781 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
782 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
783 queue_work(mad_agent_priv->qp_info->port_priv->wq,
b82cab6b 784 &mad_agent_priv->local_work);
1da177e4
LT		 785 ret = 1;
786out:
787 return ret;
788}
789
f36e1793 790static int get_pad_size(int hdr_len, int data_len)
824c8ae7
HR		 791{
792 int seg_size, pad;
793
794 seg_size = sizeof(struct ib_mad) - hdr_len;
795 if (data_len && seg_size) {
796 pad = seg_size - data_len % seg_size;
f36e1793 797 return pad == seg_size ? 0 : pad;
824c8ae7 798 } else
f36e1793
JM		 799 return seg_size;
800}
801
802static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
803{
804 struct ib_rmpp_segment *s, *t;
805
806 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
807 list_del(&s->list);
808 kfree(s);
809 }
810}
811
812static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
813 gfp_t gfp_mask)
814{
815 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
816 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
817 struct ib_rmpp_segment *seg = NULL;
818 int left, seg_size, pad;
819
820 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
821 seg_size = send_buf->seg_size;
822 pad = send_wr->pad;
823
824 /* Allocate data segments. */
825 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
826 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
827 if (!seg) {
828 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
829 "alloc failed for len %zd, gfp %#x\n",
830 sizeof (*seg) + seg_size, gfp_mask);
831 free_send_rmpp_list(send_wr);
832 return -ENOMEM;
833 }
834 seg->num = ++send_buf->seg_count;
835 list_add_tail(&seg->list, &send_wr->rmpp_list);
836 }
837
838 /* Zero any padding */
839 if (pad)
840 memset(seg->data + seg_size - pad, 0, pad);
841
842 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
843 agent.rmpp_version;
844 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
845 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
846
847 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
848 struct ib_rmpp_segment, list);
849 send_wr->last_ack_seg = send_wr->cur_seg;
850 return 0;
824c8ae7
HR		 851}
852
853struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
854 u32 remote_qpn, u16 pkey_index,
34816ad9 855 int rmpp_active,
824c8ae7 856 int hdr_len, int data_len,
dd0fc66f 857 gfp_t gfp_mask)
824c8ae7
HR		 858{
859 struct ib_mad_agent_private *mad_agent_priv;
34816ad9 860 struct ib_mad_send_wr_private *mad_send_wr;
f36e1793 861 int pad, message_size, ret, size;
824c8ae7
HR		 862 void *buf;
863
34816ad9
SH		 864 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
865 agent);
f36e1793
JM		 866 pad = get_pad_size(hdr_len, data_len);
867 message_size = hdr_len + data_len + pad;
824c8ae7 868
fa619a77 869 if ((!mad_agent->rmpp_version &&
f36e1793
JM		 870 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
871 (!rmpp_active && message_size > sizeof(struct ib_mad)))
fa619a77
HR		 872 return ERR_PTR(-EINVAL);
873
f36e1793
JM		 874 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
875 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
824c8ae7
HR		 876 if (!buf)
877 return ERR_PTR(-ENOMEM);
34816ad9 878
f36e1793
JM		 879 mad_send_wr = buf + size;
880 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
34816ad9 881 mad_send_wr->send_buf.mad = buf;
f36e1793
JM		 882 mad_send_wr->send_buf.hdr_len = hdr_len;
883 mad_send_wr->send_buf.data_len = data_len;
884 mad_send_wr->pad = pad;
34816ad9
SH		 885
886 mad_send_wr->mad_agent_priv = mad_agent_priv;
f36e1793 887 mad_send_wr->sg_list[0].length = hdr_len;
34816ad9 888 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
f36e1793
JM		 889 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
890 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
34816ad9
SH		 891
892 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
893 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
f36e1793 894 mad_send_wr->send_wr.num_sge = 2;
34816ad9
SH		 895 mad_send_wr->send_wr.opcode = IB_WR_SEND;
896 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
897 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
898 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
899 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
fa619a77
HR		 900
901 if (rmpp_active) {
f36e1793
JM		 902 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
903 if (ret) {
904 kfree(buf);
905 return ERR_PTR(ret);
906 }
fa619a77
HR		 907 }
908
34816ad9 909 mad_send_wr->send_buf.mad_agent = mad_agent;
824c8ae7 910 atomic_inc(&mad_agent_priv->refcount);
34816ad9 911 return &mad_send_wr->send_buf;
824c8ae7
HR		 912}
913EXPORT_SYMBOL(ib_create_send_mad);
914
618a3c03
HR		 915int ib_get_mad_data_offset(u8 mgmt_class)
916{
917 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
918 return IB_MGMT_SA_HDR;
919 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
920 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
921 (mgmt_class == IB_MGMT_CLASS_BIS))
922 return IB_MGMT_DEVICE_HDR;
923 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
924 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
925 return IB_MGMT_VENDOR_HDR;
926 else
927 return IB_MGMT_MAD_HDR;
928}
929EXPORT_SYMBOL(ib_get_mad_data_offset);
930
931int ib_is_mad_class_rmpp(u8 mgmt_class)
932{
933 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
934 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
935 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
936 (mgmt_class == IB_MGMT_CLASS_BIS) ||
937 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
938 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
939 return 1;
940 return 0;
941}
942EXPORT_SYMBOL(ib_is_mad_class_rmpp);
943
f36e1793
JM		 944void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
945{
946 struct ib_mad_send_wr_private *mad_send_wr;
947 struct list_head *list;
948
949 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
950 send_buf);
951 list = &mad_send_wr->cur_seg->list;
952
953 if (mad_send_wr->cur_seg->num < seg_num) {
954 list_for_each_entry(mad_send_wr->cur_seg, list, list)
955 if (mad_send_wr->cur_seg->num == seg_num)
956 break;
957 } else if (mad_send_wr->cur_seg->num > seg_num) {
958 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
959 if (mad_send_wr->cur_seg->num == seg_num)
960 break;
961 }
962 return mad_send_wr->cur_seg->data;
963}
964EXPORT_SYMBOL(ib_get_rmpp_segment);
965
966static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
967{
968 if (mad_send_wr->send_buf.seg_count)
969 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
970 mad_send_wr->seg_num);
971 else
972 return mad_send_wr->send_buf.mad +
973 mad_send_wr->send_buf.hdr_len;
974}
975
824c8ae7
HR		 976void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
977{
978 struct ib_mad_agent_private *mad_agent_priv;
f36e1793 979 struct ib_mad_send_wr_private *mad_send_wr;
824c8ae7
HR		 980
981 mad_agent_priv = container_of(send_buf->mad_agent,
982 struct ib_mad_agent_private, agent);
f36e1793
JM		 983 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
984 send_buf);
824c8ae7 985
f36e1793
JM		 986 free_send_rmpp_list(mad_send_wr);
987 kfree(send_buf->mad);
1b52fa98 988 deref_mad_agent(mad_agent_priv);
824c8ae7
HR		 989}
990EXPORT_SYMBOL(ib_free_send_mad);
991
fa619a77 992int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4
LT		 993{
994 struct ib_mad_qp_info *qp_info;
cabe3cbc 995 struct list_head *list;
34816ad9
SH		 996 struct ib_send_wr *bad_send_wr;
997 struct ib_mad_agent *mad_agent;
998 struct ib_sge *sge;
1da177e4
LT		 999 unsigned long flags;
1000 int ret;
1001
f8197a4e 1002 /* Set WR ID to find mad_send_wr upon completion */
d760ce8f 1003 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1da177e4
LT		 1004 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1005 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1006
34816ad9
SH		 1007 mad_agent = mad_send_wr->send_buf.mad_agent;
1008 sge = mad_send_wr->sg_list;
1527106f
RC		 1009 sge[0].addr = ib_dma_map_single(mad_agent->device,
1010 mad_send_wr->send_buf.mad,
1011 sge[0].length,
1012 DMA_TO_DEVICE);
1013 mad_send_wr->header_mapping = sge[0].addr;
1014
1015 sge[1].addr = ib_dma_map_single(mad_agent->device,
1016 ib_get_payload(mad_send_wr),
1017 sge[1].length,
1018 DMA_TO_DEVICE);
1019 mad_send_wr->payload_mapping = sge[1].addr;
34816ad9 1020
1da177e4 1021 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
cabe3cbc 1022 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
34816ad9
SH		 1023 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1024 &bad_send_wr);
cabe3cbc 1025 list = &qp_info->send_queue.list;
1da177e4 1026 } else {
1da177e4 1027 ret = 0;
cabe3cbc 1028 list = &qp_info->overflow_list;
1da177e4 1029 }
cabe3cbc
HR		 1030
1031 if (!ret) {
1032 qp_info->send_queue.count++;
1033 list_add_tail(&mad_send_wr->mad_list.list, list);
1034 }
1035 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
f36e1793 1036 if (ret) {
1527106f
RC		 1037 ib_dma_unmap_single(mad_agent->device,
1038 mad_send_wr->header_mapping,
1039 sge[0].length, DMA_TO_DEVICE);
1040 ib_dma_unmap_single(mad_agent->device,
1041 mad_send_wr->payload_mapping,
1042 sge[1].length, DMA_TO_DEVICE);
f36e1793 1043 }
1da177e4
LT		 1044 return ret;
1045}
1046
1047/*
1048 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1049 * with the registered client
1050 */
34816ad9
SH		 1051int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1052 struct ib_mad_send_buf **bad_send_buf)
1da177e4 1053{
1da177e4 1054 struct ib_mad_agent_private *mad_agent_priv;
34816ad9
SH		 1055 struct ib_mad_send_buf *next_send_buf;
1056 struct ib_mad_send_wr_private *mad_send_wr;
1057 unsigned long flags;
1058 int ret = -EINVAL;
1da177e4
LT		 1059
1060 /* Walk list of send WRs and post each on send list */
34816ad9 1061 for (; send_buf; send_buf = next_send_buf) {
1da177e4 1062
34816ad9
SH		 1063 mad_send_wr = container_of(send_buf,
1064 struct ib_mad_send_wr_private,
1065 send_buf);
1066 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4 1067
34816ad9
SH		 1068 if (!send_buf->mad_agent->send_handler ||
1069 (send_buf->timeout_ms &&
1070 !send_buf->mad_agent->recv_handler)) {
1071 ret = -EINVAL;
1072 goto error;
1da177e4
LT		 1073 }
1074
618a3c03
HR		 1075 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1076 if (mad_agent_priv->agent.rmpp_version) {
1077 ret = -EINVAL;
1078 goto error;
1079 }
1080 }
1081
1da177e4
LT		 1082 /*
1083 * Save pointer to next work request to post in case the
1084 * current one completes, and the user modifies the work
1085 * request associated with the completion
1086 */
34816ad9
SH		 1087 next_send_buf = send_buf->next;
1088 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1da177e4 1089
34816ad9
SH		 1090 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1091 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1092 ret = handle_outgoing_dr_smp(mad_agent_priv,
1093 mad_send_wr);
1da177e4 1094 if (ret < 0) /* error */
34816ad9 1095 goto error;
1da177e4 1096 else if (ret == 1) /* locally consumed */
34816ad9 1097 continue;
1da177e4
LT		 1098 }
1099
34816ad9 1100 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1da177e4 1101 /* Timeout will be updated after send completes */
34816ad9
SH		 1102 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1103 mad_send_wr->retries = send_buf->retries;
1104 /* Reference for work request to QP + response */
1da177e4
LT		 1105 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1106 mad_send_wr->status = IB_WC_SUCCESS;
1107
1108 /* Reference MAD agent until send completes */
1109 atomic_inc(&mad_agent_priv->refcount);
1110 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1111 list_add_tail(&mad_send_wr->agent_list,
1112 &mad_agent_priv->send_list);
1113 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1114
fa619a77
HR		 1115 if (mad_agent_priv->agent.rmpp_version) {
1116 ret = ib_send_rmpp_mad(mad_send_wr);
1117 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1118 ret = ib_send_mad(mad_send_wr);
1119 } else
1120 ret = ib_send_mad(mad_send_wr);
1121 if (ret < 0) {
1da177e4
LT		 1122 /* Fail send request */
1123 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1124 list_del(&mad_send_wr->agent_list);
1125 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1126 atomic_dec(&mad_agent_priv->refcount);
34816ad9 1127 goto error;
1da177e4 1128 }
1da177e4
LT		 1129 }
1130 return 0;
34816ad9
SH		 1131error:
1132 if (bad_send_buf)
1133 *bad_send_buf = send_buf;
1da177e4
LT		 1134 return ret;
1135}
1136EXPORT_SYMBOL(ib_post_send_mad);
1137
1138/*
1139 * ib_free_recv_mad - Returns data buffers used to receive
1140 * a MAD to the access layer
1141 */
1142void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1143{
fa619a77 1144 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1da177e4
LT		 1145 struct ib_mad_private_header *mad_priv_hdr;
1146 struct ib_mad_private *priv;
fa619a77 1147 struct list_head free_list;
1da177e4 1148
fa619a77
HR		 1149 INIT_LIST_HEAD(&free_list);
1150 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1da177e4 1151
fa619a77
HR		 1152 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1153 &free_list, list) {
1154 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1155 recv_buf);
1da177e4
LT		 1156 mad_priv_hdr = container_of(mad_recv_wc,
1157 struct ib_mad_private_header,
1158 recv_wc);
1159 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1160 header);
fa619a77 1161 kmem_cache_free(ib_mad_cache, priv);
1da177e4 1162 }
1da177e4
LT		 1163}
1164EXPORT_SYMBOL(ib_free_recv_mad);
1165
1da177e4
LT		 1166struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1167 u8 rmpp_version,
1168 ib_mad_send_handler send_handler,
1169 ib_mad_recv_handler recv_handler,
1170 void *context)
1171{
1172 return ERR_PTR(-EINVAL); /* XXX: for now */
1173}
1174EXPORT_SYMBOL(ib_redirect_mad_qp);
1175
1176int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1177 struct ib_wc *wc)
1178{
1179 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1180 return 0;
1181}
1182EXPORT_SYMBOL(ib_process_mad_wc);
1183
1184static int method_in_use(struct ib_mad_mgmt_method_table **method,
1185 struct ib_mad_reg_req *mad_reg_req)
1186{
1187 int i;
1188
1189 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1190 i < IB_MGMT_MAX_METHODS;
1191 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1192 1+i)) {
1193 if ((*method)->agent[i]) {
1194 printk(KERN_ERR PFX "Method %d already in use\n", i);
1195 return -EINVAL;
1196 }
1197 }
1198 return 0;
1199}
1200
1201static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1202{
1203 /* Allocate management method table */
de6eb66b 1204 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1da177e4
LT		 1205 if (!*method) {
1206 printk(KERN_ERR PFX "No memory for "
1207 "ib_mad_mgmt_method_table\n");
1208 return -ENOMEM;
1209 }
1da177e4
LT		 1210
1211 return 0;
1212}
1213
1214/*
1215 * Check to see if there are any methods still in use
1216 */
1217static int check_method_table(struct ib_mad_mgmt_method_table *method)
1218{
1219 int i;
1220
1221 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1222 if (method->agent[i])
1223 return 1;
1224 return 0;
1225}
1226
1227/*
1228 * Check to see if there are any method tables for this class still in use
1229 */
1230static int check_class_table(struct ib_mad_mgmt_class_table *class)
1231{
1232 int i;
1233
1234 for (i = 0; i < MAX_MGMT_CLASS; i++)
1235 if (class->method_table[i])
1236 return 1;
1237 return 0;
1238}
1239
1240static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1241{
1242 int i;
1243
1244 for (i = 0; i < MAX_MGMT_OUI; i++)
1245 if (vendor_class->method_table[i])
1246 return 1;
1247 return 0;
1248}
1249
1250static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1251 char *oui)
1252{
1253 int i;
1254
1255 for (i = 0; i < MAX_MGMT_OUI; i++)
3cd96564
RD		 1256 /* Is there matching OUI for this vendor class ? */
1257 if (!memcmp(vendor_class->oui[i], oui, 3))
1da177e4
LT		 1258 return i;
1259
1260 return -1;
1261}
1262
1263static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1264{
1265 int i;
1266
1267 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1268 if (vendor->vendor_class[i])
1269 return 1;
1270
1271 return 0;
1272}
1273
1274static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1275 struct ib_mad_agent_private *agent)
1276{
1277 int i;
1278
1279 /* Remove any methods for this mad agent */
1280 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1281 if (method->agent[i] == agent) {
1282 method->agent[i] = NULL;
1283 }
1284 }
1285}
1286
1287static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1288 struct ib_mad_agent_private *agent_priv,
1289 u8 mgmt_class)
1290{
1291 struct ib_mad_port_private *port_priv;
1292 struct ib_mad_mgmt_class_table **class;
1293 struct ib_mad_mgmt_method_table **method;
1294 int i, ret;
1295
1296 port_priv = agent_priv->qp_info->port_priv;
1297 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1298 if (!*class) {
1299 /* Allocate management class table for "new" class version */
de6eb66b 1300 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1da177e4
LT		 1301 if (!*class) {
1302 printk(KERN_ERR PFX "No memory for "
1303 "ib_mad_mgmt_class_table\n");
1304 ret = -ENOMEM;
1305 goto error1;
1306 }
de6eb66b 1307
1da177e4
LT		 1308 /* Allocate method table for this management class */
1309 method = &(*class)->method_table[mgmt_class];
1310 if ((ret = allocate_method_table(method)))
1311 goto error2;
1312 } else {
1313 method = &(*class)->method_table[mgmt_class];
1314 if (!*method) {
1315 /* Allocate method table for this management class */
1316 if ((ret = allocate_method_table(method)))
1317 goto error1;
1318 }
1319 }
1320
1321 /* Now, make sure methods are not already in use */
1322 if (method_in_use(method, mad_reg_req))
1323 goto error3;
1324
1325 /* Finally, add in methods being registered */
1326 for (i = find_first_bit(mad_reg_req->method_mask,
1327 IB_MGMT_MAX_METHODS);
1328 i < IB_MGMT_MAX_METHODS;
1329 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1330 1+i)) {
1331 (*method)->agent[i] = agent_priv;
1332 }
1333 return 0;
1334
1335error3:
1336 /* Remove any methods for this mad agent */
1337 remove_methods_mad_agent(*method, agent_priv);
1338 /* Now, check to see if there are any methods in use */
1339 if (!check_method_table(*method)) {
1340 /* If not, release management method table */
1341 kfree(*method);
1342 *method = NULL;
1343 }
1344 ret = -EINVAL;
1345 goto error1;
1346error2:
1347 kfree(*class);
1348 *class = NULL;
1349error1:
1350 return ret;
1351}
1352
1353static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1354 struct ib_mad_agent_private *agent_priv)
1355{
1356 struct ib_mad_port_private *port_priv;
1357 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1358 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1359 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1360 struct ib_mad_mgmt_method_table **method;
1361 int i, ret = -ENOMEM;
1362 u8 vclass;
1363
1364 /* "New" vendor (with OUI) class */
1365 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1366 port_priv = agent_priv->qp_info->port_priv;
1367 vendor_table = &port_priv->version[
1368 mad_reg_req->mgmt_class_version].vendor;
1369 if (!*vendor_table) {
1370 /* Allocate mgmt vendor class table for "new" class version */
de6eb66b 1371 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1da177e4
LT		 1372 if (!vendor) {
1373 printk(KERN_ERR PFX "No memory for "
1374 "ib_mad_mgmt_vendor_class_table\n");
1375 goto error1;
1376 }
de6eb66b 1377
1da177e4
LT		 1378 *vendor_table = vendor;
1379 }
1380 if (!(*vendor_table)->vendor_class[vclass]) {
1381 /* Allocate table for this management vendor class */
de6eb66b 1382 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1da177e4
LT		 1383 if (!vendor_class) {
1384 printk(KERN_ERR PFX "No memory for "
1385 "ib_mad_mgmt_vendor_class\n");
1386 goto error2;
1387 }
de6eb66b 1388
1da177e4
LT		 1389 (*vendor_table)->vendor_class[vclass] = vendor_class;
1390 }
1391 for (i = 0; i < MAX_MGMT_OUI; i++) {
1392 /* Is there matching OUI for this vendor class ? */
1393 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1394 mad_reg_req->oui, 3)) {
1395 method = &(*vendor_table)->vendor_class[
1396 vclass]->method_table[i];
1397 BUG_ON(!*method);
1398 goto check_in_use;
1399 }
1400 }
1401 for (i = 0; i < MAX_MGMT_OUI; i++) {
1402 /* OUI slot available ? */
1403 if (!is_vendor_oui((*vendor_table)->vendor_class[
1404 vclass]->oui[i])) {
1405 method = &(*vendor_table)->vendor_class[
1406 vclass]->method_table[i];
1407 BUG_ON(*method);
1408 /* Allocate method table for this OUI */
1409 if ((ret = allocate_method_table(method)))
1410 goto error3;
1411 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1412 mad_reg_req->oui, 3);
1413 goto check_in_use;
1414 }
1415 }
1416 printk(KERN_ERR PFX "All OUI slots in use\n");
1417 goto error3;
1418
1419check_in_use:
1420 /* Now, make sure methods are not already in use */
1421 if (method_in_use(method, mad_reg_req))
1422 goto error4;
1423
1424 /* Finally, add in methods being registered */
1425 for (i = find_first_bit(mad_reg_req->method_mask,
1426 IB_MGMT_MAX_METHODS);
1427 i < IB_MGMT_MAX_METHODS;
1428 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1429 1+i)) {
1430 (*method)->agent[i] = agent_priv;
1431 }
1432 return 0;
1433
1434error4:
1435 /* Remove any methods for this mad agent */
1436 remove_methods_mad_agent(*method, agent_priv);
1437 /* Now, check to see if there are any methods in use */
1438 if (!check_method_table(*method)) {
1439 /* If not, release management method table */
1440 kfree(*method);
1441 *method = NULL;
1442 }
1443 ret = -EINVAL;
1444error3:
1445 if (vendor_class) {
1446 (*vendor_table)->vendor_class[vclass] = NULL;
1447 kfree(vendor_class);
1448 }
1449error2:
1450 if (vendor) {
1451 *vendor_table = NULL;
1452 kfree(vendor);
1453 }
1454error1:
1455 return ret;
1456}
1457
1458static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1459{
1460 struct ib_mad_port_private *port_priv;
1461 struct ib_mad_mgmt_class_table *class;
1462 struct ib_mad_mgmt_method_table *method;
1463 struct ib_mad_mgmt_vendor_class_table *vendor;
1464 struct ib_mad_mgmt_vendor_class *vendor_class;
1465 int index;
1466 u8 mgmt_class;
1467
1468 /*
1469 * Was MAD registration request supplied
1470 * with original registration ?
1471 */
1472 if (!agent_priv->reg_req) {
1473 goto out;
1474 }
1475
1476 port_priv = agent_priv->qp_info->port_priv;
1477 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1478 class = port_priv->version[
1479 agent_priv->reg_req->mgmt_class_version].class;
1480 if (!class)
1481 goto vendor_check;
1482
1483 method = class->method_table[mgmt_class];
1484 if (method) {
1485 /* Remove any methods for this mad agent */
1486 remove_methods_mad_agent(method, agent_priv);
1487 /* Now, check to see if there are any methods still in use */
1488 if (!check_method_table(method)) {
1489 /* If not, release management method table */
1490 kfree(method);
1491 class->method_table[mgmt_class] = NULL;
1492 /* Any management classes left ? */
1493 if (!check_class_table(class)) {
1494 /* If not, release management class table */
1495 kfree(class);
1496 port_priv->version[
1497 agent_priv->reg_req->
1498 mgmt_class_version].class = NULL;
1499 }
1500 }
1501 }
1502
1503vendor_check:
1504 if (!is_vendor_class(mgmt_class))
1505 goto out;
1506
1507 /* normalize mgmt_class to vendor range 2 */
1508 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1509 vendor = port_priv->version[
1510 agent_priv->reg_req->mgmt_class_version].vendor;
1511
1512 if (!vendor)
1513 goto out;
1514
1515 vendor_class = vendor->vendor_class[mgmt_class];
1516 if (vendor_class) {
1517 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1518 if (index < 0)
1519 goto out;
1520 method = vendor_class->method_table[index];
1521 if (method) {
1522 /* Remove any methods for this mad agent */
1523 remove_methods_mad_agent(method, agent_priv);
1524 /*
1525 * Now, check to see if there are
1526 * any methods still in use
1527 */
1528 if (!check_method_table(method)) {
1529 /* If not, release management method table */
1530 kfree(method);
1531 vendor_class->method_table[index] = NULL;
1532 memset(vendor_class->oui[index], 0, 3);
1533 /* Any OUIs left ? */
1534 if (!check_vendor_class(vendor_class)) {
1535 /* If not, release vendor class table */
1536 kfree(vendor_class);
1537 vendor->vendor_class[mgmt_class] = NULL;
1538 /* Any other vendor classes left ? */
1539 if (!check_vendor_table(vendor)) {
1540 kfree(vendor);
1541 port_priv->version[
1542 agent_priv->reg_req->
1543 mgmt_class_version].
1544 vendor = NULL;
1545 }
1546 }
1547 }
1548 }
1549 }
1550
1551out:
1552 return;
1553}
1554
1da177e4
LT		 1555static struct ib_mad_agent_private *
1556find_mad_agent(struct ib_mad_port_private *port_priv,
4a0754fa 1557 struct ib_mad *mad)
1da177e4
LT		 1558{
1559 struct ib_mad_agent_private *mad_agent = NULL;
1560 unsigned long flags;
1561
1562 spin_lock_irqsave(&port_priv->reg_lock, flags);
2527e681 1563 if (ib_response_mad(mad)) {
1da177e4
LT		 1564 u32 hi_tid;
1565 struct ib_mad_agent_private *entry;
1566
1567 /*
1568 * Routing is based on high 32 bits of transaction ID
1569 * of MAD.
1570 */
1571 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
34816ad9 1572 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1da177e4
LT		 1573 if (entry->agent.hi_tid == hi_tid) {
1574 mad_agent = entry;
1575 break;
1576 }
1577 }
1578 } else {
1579 struct ib_mad_mgmt_class_table *class;
1580 struct ib_mad_mgmt_method_table *method;
1581 struct ib_mad_mgmt_vendor_class_table *vendor;
1582 struct ib_mad_mgmt_vendor_class *vendor_class;
1583 struct ib_vendor_mad *vendor_mad;
1584 int index;
1585
1586 /*
1587 * Routing is based on version, class, and method
1588 * For "newer" vendor MADs, also based on OUI
1589 */
1590 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1591 goto out;
1592 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1593 class = port_priv->version[
1594 mad->mad_hdr.class_version].class;
1595 if (!class)
1596 goto out;
1597 method = class->method_table[convert_mgmt_class(
1598 mad->mad_hdr.mgmt_class)];
1599 if (method)
1600 mad_agent = method->agent[mad->mad_hdr.method &
1601 ~IB_MGMT_METHOD_RESP];
1602 } else {
1603 vendor = port_priv->version[
1604 mad->mad_hdr.class_version].vendor;
1605 if (!vendor)
1606 goto out;
1607 vendor_class = vendor->vendor_class[vendor_class_index(
1608 mad->mad_hdr.mgmt_class)];
1609 if (!vendor_class)
1610 goto out;
1611 /* Find matching OUI */
1612 vendor_mad = (struct ib_vendor_mad *)mad;
1613 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1614 if (index == -1)
1615 goto out;
1616 method = vendor_class->method_table[index];
1617 if (method) {
1618 mad_agent = method->agent[mad->mad_hdr.method &
1619 ~IB_MGMT_METHOD_RESP];
1620 }
1621 }
1622 }
1623
1624 if (mad_agent) {
1625 if (mad_agent->agent.recv_handler)
1626 atomic_inc(&mad_agent->refcount);
1627 else {
1628 printk(KERN_NOTICE PFX "No receive handler for client "
1629 "%p on port %d\n",
1630 &mad_agent->agent, port_priv->port_num);
1631 mad_agent = NULL;
1632 }
1633 }
1634out:
1635 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1636
1637 return mad_agent;
1638}
1639
1640static int validate_mad(struct ib_mad *mad, u32 qp_num)
1641{
1642 int valid = 0;
1643
1644 /* Make sure MAD base version is understood */
1645 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1646 printk(KERN_ERR PFX "MAD received with unsupported base "
1647 "version %d\n", mad->mad_hdr.base_version);
1648 goto out;
1649 }
1650
1651 /* Filter SMI packets sent to other than QP0 */
1652 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1653 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1654 if (qp_num == 0)
1655 valid = 1;
1656 } else {
1657 /* Filter GSI packets sent to QP0 */
1658 if (qp_num != 0)
1659 valid = 1;
1660 }
1661
1662out:
1663 return valid;
1664}
1665
fa619a77
HR		 1666static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1667 struct ib_mad_hdr *mad_hdr)
1668{
1669 struct ib_rmpp_mad *rmpp_mad;
1670
1671 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1672 return !mad_agent_priv->agent.rmpp_version ||
1673 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1674 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1675 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1676}
1677
fa9656bb
JM		 1678static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1679 struct ib_mad_recv_wc *rwc)
1680{
1681 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1682 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1683}
1684
9874e746
JM		 1685static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1686 struct ib_mad_send_wr_private *wr,
fa9656bb
JM		 1687 struct ib_mad_recv_wc *rwc )
1688{
1689 struct ib_ah_attr attr;
1690 u8 send_resp, rcv_resp;
9874e746
JM		 1691 union ib_gid sgid;
1692 struct ib_device *device = mad_agent_priv->agent.device;
1693 u8 port_num = mad_agent_priv->agent.port_num;
1694 u8 lmc;
fa9656bb
JM		 1695
1696 send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1697 mad_hdr.method & IB_MGMT_METHOD_RESP;
1698 rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1699
fa9656bb
JM		 1700 if (send_resp == rcv_resp)
1701 /* both requests, or both responses. GIDs different */
1702 return 0;
1703
1704 if (ib_query_ah(wr->send_buf.ah, &attr))
1705 /* Assume not equal, to avoid false positives. */
1706 return 0;
1707
9874e746
JM		 1708 if (!!(attr.ah_flags & IB_AH_GRH) !=
1709 !!(rwc->wc->wc_flags & IB_WC_GRH))
fa9656bb
JM		 1710 /* one has GID, other does not. Assume different */
1711 return 0;
9874e746
JM		 1712
1713 if (!send_resp && rcv_resp) {
1714 /* is request/response. */
1715 if (!(attr.ah_flags & IB_AH_GRH)) {
1716 if (ib_get_cached_lmc(device, port_num, &lmc))
1717 return 0;
1718 return (!lmc || !((attr.src_path_bits ^
1719 rwc->wc->dlid_path_bits) &
1720 ((1 << lmc) - 1)));
1721 } else {
1722 if (ib_get_cached_gid(device, port_num,
1723 attr.grh.sgid_index, &sgid))
1724 return 0;
1725 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1726 16);
1727 }
1728 }
1729
1730 if (!(attr.ah_flags & IB_AH_GRH))
1731 return attr.dlid == rwc->wc->slid;
1732 else
1733 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1734 16);
1735}
1736
1737static inline int is_direct(u8 class)
1738{
1739 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
fa9656bb 1740}
9874e746 1741
fa619a77 1742struct ib_mad_send_wr_private*
fa9656bb 1743ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
9874e746 1744 struct ib_mad_recv_wc *wc)
1da177e4 1745{
9874e746 1746 struct ib_mad_send_wr_private *wr;
fa9656bb
JM		 1747 struct ib_mad *mad;
1748
9874e746
JM		 1749 mad = (struct ib_mad *)wc->recv_buf.mad;
1750
1751 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1752 if ((wr->tid == mad->mad_hdr.tid) &&
1753 rcv_has_same_class(wr, wc) &&
1754 /*
1755 * Don't check GID for direct routed MADs.
1756 * These might have permissive LIDs.
1757 */
1758 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1759 rcv_has_same_gid(mad_agent_priv, wr, wc)))
39798695 1760 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1da177e4
LT		 1761 }
1762
1763 /*
1764 * It's possible to receive the response before we've
1765 * been notified that the send has completed
1766 */
9874e746
JM		 1767 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1768 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1769 wr->tid == mad->mad_hdr.tid &&
1770 wr->timeout &&
1771 rcv_has_same_class(wr, wc) &&
1772 /*
1773 * Don't check GID for direct routed MADs.
1774 * These might have permissive LIDs.
1775 */
1776 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1777 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1da177e4 1778 /* Verify request has not been canceled */
9874e746 1779 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1da177e4
LT		 1780 }
1781 return NULL;
1782}
1783
fa619a77 1784void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
6a0c435e
HR		 1785{
1786 mad_send_wr->timeout = 0;
179e0917
AM		 1787 if (mad_send_wr->refcount == 1)
1788 list_move_tail(&mad_send_wr->agent_list,
6a0c435e 1789 &mad_send_wr->mad_agent_priv->done_list);
6a0c435e
HR		 1790}
1791
1da177e4 1792static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
4a0754fa 1793 struct ib_mad_recv_wc *mad_recv_wc)
1da177e4
LT		 1794{
1795 struct ib_mad_send_wr_private *mad_send_wr;
1796 struct ib_mad_send_wc mad_send_wc;
1797 unsigned long flags;
1798
fa619a77
HR		 1799 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1800 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1801 if (mad_agent_priv->agent.rmpp_version) {
1802 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1803 mad_recv_wc);
1804 if (!mad_recv_wc) {
1b52fa98 1805 deref_mad_agent(mad_agent_priv);
fa619a77
HR		 1806 return;
1807 }
1808 }
1809
1da177e4 1810 /* Complete corresponding request */
2527e681 1811 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1da177e4 1812 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa9656bb 1813 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1da177e4
LT		 1814 if (!mad_send_wr) {
1815 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
4a0754fa 1816 ib_free_recv_mad(mad_recv_wc);
1b52fa98 1817 deref_mad_agent(mad_agent_priv);
1da177e4
LT		 1818 return;
1819 }
fa619a77 1820 ib_mark_mad_done(mad_send_wr);
1da177e4
LT		 1821 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1822
1823 /* Defined behavior is to complete response before request */
34816ad9 1824 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
4a0754fa
HR		 1825 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1826 mad_recv_wc);
1da177e4
LT		 1827 atomic_dec(&mad_agent_priv->refcount);
1828
1829 mad_send_wc.status = IB_WC_SUCCESS;
1830 mad_send_wc.vendor_err = 0;
34816ad9 1831 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1da177e4
LT		 1832 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1833 } else {
4a0754fa
HR		 1834 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1835 mad_recv_wc);
1b52fa98 1836 deref_mad_agent(mad_agent_priv);
1da177e4
LT		 1837 }
1838}
1839
1840static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1841 struct ib_wc *wc)
1842{
1843 struct ib_mad_qp_info *qp_info;
1844 struct ib_mad_private_header *mad_priv_hdr;
445d6807 1845 struct ib_mad_private *recv, *response = NULL;
1da177e4
LT		 1846 struct ib_mad_list_head *mad_list;
1847 struct ib_mad_agent_private *mad_agent;
1bae4dbf 1848 int port_num;
1da177e4 1849
1da177e4
LT		 1850 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1851 qp_info = mad_list->mad_queue->qp_info;
1852 dequeue_mad(mad_list);
1853
1854 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1855 mad_list);
1856 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1527106f
RC		 1857 ib_dma_unmap_single(port_priv->device,
1858 recv->header.mapping,
1859 sizeof(struct ib_mad_private) -
1860 sizeof(struct ib_mad_private_header),
1861 DMA_FROM_DEVICE);
1da177e4
LT		 1862
1863 /* Setup MAD receive work completion from "normal" work completion */
24239aff
SH		 1864 recv->header.wc = *wc;
1865 recv->header.recv_wc.wc = &recv->header.wc;
1da177e4
LT		 1866 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1867 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1868 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1869
1870 if (atomic_read(&qp_info->snoop_count))
1871 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1872
1873 /* Validate MAD */
1874 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1875 goto out;
1876
445d6807
HR		 1877 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1878 if (!response) {
1879 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1880 "for response buffer\n");
1881 goto out;
1882 }
1883
1bae4dbf
HR		 1884 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1885 port_num = wc->port_num;
1886 else
1887 port_num = port_priv->port_num;
1888
1da177e4
LT		 1889 if (recv->mad.mad.mad_hdr.mgmt_class ==
1890 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1bae4dbf
HR		 1891 enum smi_forward_action retsmi;
1892
de493d47
HR		 1893 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1894 port_priv->device->node_type,
1bae4dbf 1895 port_num,
de493d47
HR		 1896 port_priv->device->phys_port_cnt) ==
1897 IB_SMI_DISCARD)
1da177e4 1898 goto out;
de493d47 1899
1bae4dbf
HR		 1900 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1901 if (retsmi == IB_SMI_LOCAL)
1da177e4 1902 goto local;
de493d47 1903
1bae4dbf
HR		 1904 if (retsmi == IB_SMI_SEND) { /* don't forward */
1905 if (smi_handle_dr_smp_send(&recv->mad.smp,
1906 port_priv->device->node_type,
1907 port_num) == IB_SMI_DISCARD)
1908 goto out;
1909
1910 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1911 goto out;
1912 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1913 /* forward case for switches */
1914 memcpy(response, recv, sizeof(*response));
1915 response->header.recv_wc.wc = &response->header.wc;
1916 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1917 response->header.recv_wc.recv_buf.grh = &response->grh;
1918
86dfbecd
HR		 1919 agent_send_response(&response->mad.mad,
1920 &response->grh, wc,
1921 port_priv->device,
1922 smi_get_fwd_port(&recv->mad.smp),
1923 qp_info->qp->qp_num);
de493d47 1924
1da177e4 1925 goto out;
1bae4dbf 1926 }
1da177e4
LT		 1927 }
1928
1929local:
1930 /* Give driver "right of first refusal" on incoming MAD */
1931 if (port_priv->device->process_mad) {
1932 int ret;
1933
1da177e4
LT		 1934 ret = port_priv->device->process_mad(port_priv->device, 0,
1935 port_priv->port_num,
1936 wc, &recv->grh,
1937 &recv->mad.mad,
1938 &response->mad.mad);
1939 if (ret & IB_MAD_RESULT_SUCCESS) {
1940 if (ret & IB_MAD_RESULT_CONSUMED)
1941 goto out;
1942 if (ret & IB_MAD_RESULT_REPLY) {
34816ad9
SH		 1943 agent_send_response(&response->mad.mad,
1944 &recv->grh, wc,
1945 port_priv->device,
1bae4dbf 1946 port_num,
34816ad9 1947 qp_info->qp->qp_num);
1da177e4
LT		 1948 goto out;
1949 }
1950 }
1951 }
1952
4a0754fa 1953 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1da177e4 1954 if (mad_agent) {
4a0754fa 1955 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1da177e4
LT		 1956 /*
1957 * recv is freed up in error cases in ib_mad_complete_recv
1958 * or via recv_handler in ib_mad_complete_recv()
1959 */
1960 recv = NULL;
1961 }
1962
1963out:
1964 /* Post another receive request for this QP */
1965 if (response) {
1966 ib_mad_post_receive_mads(qp_info, response);
1967 if (recv)
1968 kmem_cache_free(ib_mad_cache, recv);
1969 } else
1970 ib_mad_post_receive_mads(qp_info, recv);
1971}
1972
1973static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1974{
1975 struct ib_mad_send_wr_private *mad_send_wr;
1976 unsigned long delay;
1977
1978 if (list_empty(&mad_agent_priv->wait_list)) {
1979 cancel_delayed_work(&mad_agent_priv->timed_work);
1980 } else {
1981 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1982 struct ib_mad_send_wr_private,
1983 agent_list);
1984
1985 if (time_after(mad_agent_priv->timeout,
1986 mad_send_wr->timeout)) {
1987 mad_agent_priv->timeout = mad_send_wr->timeout;
1988 cancel_delayed_work(&mad_agent_priv->timed_work);
1989 delay = mad_send_wr->timeout - jiffies;
1990 if ((long)delay <= 0)
1991 delay = 1;
1992 queue_delayed_work(mad_agent_priv->qp_info->
1993 port_priv->wq,
1994 &mad_agent_priv->timed_work, delay);
1995 }
1996 }
1997}
1998
d760ce8f 1999static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4 2000{
d760ce8f 2001 struct ib_mad_agent_private *mad_agent_priv;
1da177e4
LT		 2002 struct ib_mad_send_wr_private *temp_mad_send_wr;
2003 struct list_head *list_item;
2004 unsigned long delay;
2005
d760ce8f 2006 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4
LT		 2007 list_del(&mad_send_wr->agent_list);
2008
2009 delay = mad_send_wr->timeout;
2010 mad_send_wr->timeout += jiffies;
2011
29bb33dd
HR		 2012 if (delay) {
2013 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2014 temp_mad_send_wr = list_entry(list_item,
2015 struct ib_mad_send_wr_private,
2016 agent_list);
2017 if (time_after(mad_send_wr->timeout,
2018 temp_mad_send_wr->timeout))
2019 break;
2020 }
1da177e4 2021 }
29bb33dd
HR		 2022 else
2023 list_item = &mad_agent_priv->wait_list;
1da177e4
LT		 2024 list_add(&mad_send_wr->agent_list, list_item);
2025
2026 /* Reschedule a work item if we have a shorter timeout */
2027 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2028 cancel_delayed_work(&mad_agent_priv->timed_work);
2029 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2030 &mad_agent_priv->timed_work, delay);
2031 }
2032}
2033
03b61ad2
HR		 2034void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2035 int timeout_ms)
2036{
2037 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2038 wait_for_response(mad_send_wr);
2039}
2040
1da177e4
LT		 2041/*
2042 * Process a send work completion
2043 */
fa619a77
HR		 2044void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2045 struct ib_mad_send_wc *mad_send_wc)
1da177e4
LT		 2046{
2047 struct ib_mad_agent_private *mad_agent_priv;
2048 unsigned long flags;
fa619a77 2049 int ret;
1da177e4 2050
d760ce8f 2051 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4 2052 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa619a77
HR		 2053 if (mad_agent_priv->agent.rmpp_version) {
2054 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2055 if (ret == IB_RMPP_RESULT_CONSUMED)
2056 goto done;
2057 } else
2058 ret = IB_RMPP_RESULT_UNHANDLED;
2059
1da177e4
LT		 2060 if (mad_send_wc->status != IB_WC_SUCCESS &&
2061 mad_send_wr->status == IB_WC_SUCCESS) {
2062 mad_send_wr->status = mad_send_wc->status;
2063 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2064 }
2065
2066 if (--mad_send_wr->refcount > 0) {
2067 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2068 mad_send_wr->status == IB_WC_SUCCESS) {
d760ce8f 2069 wait_for_response(mad_send_wr);
1da177e4 2070 }
fa619a77 2071 goto done;
1da177e4
LT		 2072 }
2073
2074 /* Remove send from MAD agent and notify client of completion */
2075 list_del(&mad_send_wr->agent_list);
2076 adjust_timeout(mad_agent_priv);
2077 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2078
2079 if (mad_send_wr->status != IB_WC_SUCCESS )
2080 mad_send_wc->status = mad_send_wr->status;
34816ad9
SH		 2081 if (ret == IB_RMPP_RESULT_INTERNAL)
2082 ib_rmpp_send_handler(mad_send_wc);
2083 else
fa619a77
HR		 2084 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2085 mad_send_wc);
1da177e4
LT		 2086
2087 /* Release reference on agent taken when sending */
1b52fa98 2088 deref_mad_agent(mad_agent_priv);
fa619a77
HR		 2089 return;
2090done:
2091 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1da177e4
LT		 2092}
2093
2094static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2095 struct ib_wc *wc)
2096{
2097 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2098 struct ib_mad_list_head *mad_list;
2099 struct ib_mad_qp_info *qp_info;
2100 struct ib_mad_queue *send_queue;
2101 struct ib_send_wr *bad_send_wr;
34816ad9 2102 struct ib_mad_send_wc mad_send_wc;
1da177e4
LT		 2103 unsigned long flags;
2104 int ret;
2105
2106 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2107 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2108 mad_list);
2109 send_queue = mad_list->mad_queue;
2110 qp_info = send_queue->qp_info;
2111
2112retry:
1527106f
RC		 2113 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2114 mad_send_wr->header_mapping,
2115 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2116 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2117 mad_send_wr->payload_mapping,
2118 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
1da177e4
LT		 2119 queued_send_wr = NULL;
2120 spin_lock_irqsave(&send_queue->lock, flags);
2121 list_del(&mad_list->list);
2122
2123 /* Move queued send to the send queue */
2124 if (send_queue->count-- > send_queue->max_active) {
2125 mad_list = container_of(qp_info->overflow_list.next,
2126 struct ib_mad_list_head, list);
2127 queued_send_wr = container_of(mad_list,
2128 struct ib_mad_send_wr_private,
2129 mad_list);
179e0917 2130 list_move_tail(&mad_list->list, &send_queue->list);
1da177e4
LT		 2131 }
2132 spin_unlock_irqrestore(&send_queue->lock, flags);
2133
34816ad9
SH		 2134 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2135 mad_send_wc.status = wc->status;
2136 mad_send_wc.vendor_err = wc->vendor_err;
1da177e4 2137 if (atomic_read(&qp_info->snoop_count))
34816ad9 2138 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
1da177e4 2139 IB_MAD_SNOOP_SEND_COMPLETIONS);
34816ad9 2140 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1da177e4
LT		 2141
2142 if (queued_send_wr) {
2143 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
34816ad9 2144 &bad_send_wr);
1da177e4
LT		 2145 if (ret) {
2146 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2147 mad_send_wr = queued_send_wr;
2148 wc->status = IB_WC_LOC_QP_OP_ERR;
2149 goto retry;
2150 }
2151 }
2152}
2153
2154static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2155{
2156 struct ib_mad_send_wr_private *mad_send_wr;
2157 struct ib_mad_list_head *mad_list;
2158 unsigned long flags;
2159
2160 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2161 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2162 mad_send_wr = container_of(mad_list,
2163 struct ib_mad_send_wr_private,
2164 mad_list);
2165 mad_send_wr->retry = 1;
2166 }
2167 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2168}
2169
2170static void mad_error_handler(struct ib_mad_port_private *port_priv,
2171 struct ib_wc *wc)
2172{
2173 struct ib_mad_list_head *mad_list;
2174 struct ib_mad_qp_info *qp_info;
2175 struct ib_mad_send_wr_private *mad_send_wr;
2176 int ret;
2177
2178 /* Determine if failure was a send or receive */
2179 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2180 qp_info = mad_list->mad_queue->qp_info;
2181 if (mad_list->mad_queue == &qp_info->recv_queue)
2182 /*
2183 * Receive errors indicate that the QP has entered the error
2184 * state - error handling/shutdown code will cleanup
2185 */
2186 return;
2187
2188 /*
2189 * Send errors will transition the QP to SQE - move
2190 * QP to RTS and repost flushed work requests
2191 */
2192 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2193 mad_list);
2194 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2195 if (mad_send_wr->retry) {
2196 /* Repost send */
2197 struct ib_send_wr *bad_send_wr;
2198
2199 mad_send_wr->retry = 0;
2200 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2201 &bad_send_wr);
2202 if (ret)
2203 ib_mad_send_done_handler(port_priv, wc);
2204 } else
2205 ib_mad_send_done_handler(port_priv, wc);
2206 } else {
2207 struct ib_qp_attr *attr;
2208
2209 /* Transition QP to RTS and fail offending send */
2210 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2211 if (attr) {
2212 attr->qp_state = IB_QPS_RTS;
2213 attr->cur_qp_state = IB_QPS_SQE;
2214 ret = ib_modify_qp(qp_info->qp, attr,
2215 IB_QP_STATE | IB_QP_CUR_STATE);
2216 kfree(attr);
2217 if (ret)
2218 printk(KERN_ERR PFX "mad_error_handler - "
2219 "ib_modify_qp to RTS : %d\n", ret);
2220 else
2221 mark_sends_for_retry(qp_info);
2222 }
2223 ib_mad_send_done_handler(port_priv, wc);
2224 }
2225}
2226
2227/*
2228 * IB MAD completion callback
2229 */
c4028958 2230static void ib_mad_completion_handler(struct work_struct *work)
1da177e4
LT		 2231{
2232 struct ib_mad_port_private *port_priv;
2233 struct ib_wc wc;
2234
c4028958 2235 port_priv = container_of(work, struct ib_mad_port_private, work);
1da177e4
LT		 2236 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2237
2238 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2239 if (wc.status == IB_WC_SUCCESS) {
2240 switch (wc.opcode) {
2241 case IB_WC_SEND:
2242 ib_mad_send_done_handler(port_priv, &wc);
2243 break;
2244 case IB_WC_RECV:
2245 ib_mad_recv_done_handler(port_priv, &wc);
2246 break;
2247 default:
2248 BUG_ON(1);
2249 break;
2250 }
2251 } else
2252 mad_error_handler(port_priv, &wc);
2253 }
2254}
2255
2256static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2257{
2258 unsigned long flags;
2259 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2260 struct ib_mad_send_wc mad_send_wc;
2261 struct list_head cancel_list;
2262
2263 INIT_LIST_HEAD(&cancel_list);
2264
2265 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2266 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2267 &mad_agent_priv->send_list, agent_list) {
2268 if (mad_send_wr->status == IB_WC_SUCCESS) {
3cd96564 2269 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
1da177e4
LT		 2270 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2271 }
2272 }
2273
2274 /* Empty wait list to prevent receives from finding a request */
2275 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2c153b93
HR		 2276 /* Empty local completion list as well */
2277 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
1da177e4
LT		 2278 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2279
2280 /* Report all cancelled requests */
2281 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2282 mad_send_wc.vendor_err = 0;
2283
2284 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2285 &cancel_list, agent_list) {
34816ad9
SH		 2286 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2287 list_del(&mad_send_wr->agent_list);
1da177e4
LT		 2288 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2289 &mad_send_wc);
1da177e4
LT		 2290 atomic_dec(&mad_agent_priv->refcount);
2291 }
2292}
2293
2294static struct ib_mad_send_wr_private*
34816ad9
SH		 2295find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2296 struct ib_mad_send_buf *send_buf)
1da177e4
LT		 2297{
2298 struct ib_mad_send_wr_private *mad_send_wr;
2299
2300 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2301 agent_list) {
34816ad9 2302 if (&mad_send_wr->send_buf == send_buf)
1da177e4
LT		 2303 return mad_send_wr;
2304 }
2305
2306 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2307 agent_list) {
34816ad9
SH		 2308 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2309 &mad_send_wr->send_buf == send_buf)
1da177e4
LT		 2310 return mad_send_wr;
2311 }
2312 return NULL;
2313}
2314
34816ad9
SH		 2315int ib_modify_mad(struct ib_mad_agent *mad_agent,
2316 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
1da177e4
LT		 2317{
2318 struct ib_mad_agent_private *mad_agent_priv;
2319 struct ib_mad_send_wr_private *mad_send_wr;
2320 unsigned long flags;
cabe3cbc 2321 int active;
1da177e4
LT		 2322
2323 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2324 agent);
2325 spin_lock_irqsave(&mad_agent_priv->lock, flags);
34816ad9 2326 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
03b61ad2 2327 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
1da177e4 2328 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2 2329 return -EINVAL;
1da177e4
LT		 2330 }
2331
cabe3cbc 2332 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
03b61ad2 2333 if (!timeout_ms) {
1da177e4 2334 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
03b61ad2 2335 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1da177e4
LT		 2336 }
2337
34816ad9 2338 mad_send_wr->send_buf.timeout_ms = timeout_ms;
cabe3cbc 2339 if (active)
03b61ad2
HR		 2340 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2341 else
2342 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2343
1da177e4 2344 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2
HR		 2345 return 0;
2346}
2347EXPORT_SYMBOL(ib_modify_mad);
1da177e4 2348
34816ad9
SH		 2349void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2350 struct ib_mad_send_buf *send_buf)
03b61ad2 2351{
34816ad9 2352 ib_modify_mad(mad_agent, send_buf, 0);
1da177e4
LT		 2353}
2354EXPORT_SYMBOL(ib_cancel_mad);
2355
c4028958 2356static void local_completions(struct work_struct *work)
1da177e4
LT		 2357{
2358 struct ib_mad_agent_private *mad_agent_priv;
2359 struct ib_mad_local_private *local;
2360 struct ib_mad_agent_private *recv_mad_agent;
2361 unsigned long flags;
2c153b93 2362 int recv = 0;
1da177e4
LT		 2363 struct ib_wc wc;
2364 struct ib_mad_send_wc mad_send_wc;
2365
c4028958
DH		 2366 mad_agent_priv =
2367 container_of(work, struct ib_mad_agent_private, local_work);
1da177e4
LT		 2368
2369 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2370 while (!list_empty(&mad_agent_priv->local_list)) {
2371 local = list_entry(mad_agent_priv->local_list.next,
2372 struct ib_mad_local_private,
2373 completion_list);
37289efe 2374 list_del(&local->completion_list);
1da177e4
LT		 2375 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2376 if (local->mad_priv) {
2377 recv_mad_agent = local->recv_mad_agent;
2378 if (!recv_mad_agent) {
2379 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
1da177e4
LT		 2380 goto local_send_completion;
2381 }
2382
2c153b93 2383 recv = 1;
1da177e4
LT		 2384 /*
2385 * Defined behavior is to complete response
2386 * before request
2387 */
062dbb69
MT		 2388 build_smp_wc(recv_mad_agent->agent.qp,
2389 (unsigned long) local->mad_send_wr,
97f52eb4 2390 be16_to_cpu(IB_LID_PERMISSIVE),
34816ad9 2391 0, recv_mad_agent->agent.port_num, &wc);
1da177e4
LT		 2392
2393 local->mad_priv->header.recv_wc.wc = &wc;
2394 local->mad_priv->header.recv_wc.mad_len =
2395 sizeof(struct ib_mad);
fa619a77
HR		 2396 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2397 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2398 &local->mad_priv->header.recv_wc.rmpp_list);
1da177e4
LT		 2399 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2400 local->mad_priv->header.recv_wc.recv_buf.mad =
2401 &local->mad_priv->mad.mad;
2402 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2403 snoop_recv(recv_mad_agent->qp_info,
2404 &local->mad_priv->header.recv_wc,
2405 IB_MAD_SNOOP_RECVS);
2406 recv_mad_agent->agent.recv_handler(
2407 &recv_mad_agent->agent,
2408 &local->mad_priv->header.recv_wc);
2409 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2410 atomic_dec(&recv_mad_agent->refcount);
2411 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2412 }
2413
2414local_send_completion:
2415 /* Complete send */
2416 mad_send_wc.status = IB_WC_SUCCESS;
2417 mad_send_wc.vendor_err = 0;
34816ad9 2418 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
1da177e4 2419 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
34816ad9
SH		 2420 snoop_send(mad_agent_priv->qp_info,
2421 &local->mad_send_wr->send_buf,
2422 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
1da177e4
LT		 2423 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2424 &mad_send_wc);
2425
2426 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1da177e4 2427 atomic_dec(&mad_agent_priv->refcount);
2c153b93
HR		 2428 if (!recv)
2429 kmem_cache_free(ib_mad_cache, local->mad_priv);
1da177e4
LT		 2430 kfree(local);
2431 }
2432 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2433}
2434
f75b7a52
HR		 2435static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2436{
2437 int ret;
2438
2439 if (!mad_send_wr->retries--)
2440 return -ETIMEDOUT;
2441
34816ad9 2442 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
f75b7a52 2443
fa619a77
HR		 2444 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2445 ret = ib_retry_rmpp(mad_send_wr);
2446 switch (ret) {
2447 case IB_RMPP_RESULT_UNHANDLED:
2448 ret = ib_send_mad(mad_send_wr);
2449 break;
2450 case IB_RMPP_RESULT_CONSUMED:
2451 ret = 0;
2452 break;
2453 default:
2454 ret = -ECOMM;
2455 break;
2456 }
2457 } else
2458 ret = ib_send_mad(mad_send_wr);
f75b7a52
HR		 2459
2460 if (!ret) {
2461 mad_send_wr->refcount++;
f75b7a52
HR		 2462 list_add_tail(&mad_send_wr->agent_list,
2463 &mad_send_wr->mad_agent_priv->send_list);
2464 }
2465 return ret;
2466}
2467
c4028958 2468static void timeout_sends(struct work_struct *work)
1da177e4
LT		 2469{
2470 struct ib_mad_agent_private *mad_agent_priv;
2471 struct ib_mad_send_wr_private *mad_send_wr;
2472 struct ib_mad_send_wc mad_send_wc;
2473 unsigned long flags, delay;
2474
c4028958
DH		 2475 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2476 timed_work.work);
1da177e4
LT		 2477 mad_send_wc.vendor_err = 0;
2478
2479 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2480 while (!list_empty(&mad_agent_priv->wait_list)) {
2481 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2482 struct ib_mad_send_wr_private,
2483 agent_list);
2484
2485 if (time_after(mad_send_wr->timeout, jiffies)) {
2486 delay = mad_send_wr->timeout - jiffies;
2487 if ((long)delay <= 0)
2488 delay = 1;
2489 queue_delayed_work(mad_agent_priv->qp_info->
2490 port_priv->wq,
2491 &mad_agent_priv->timed_work, delay);
2492 break;
2493 }
2494
dbf9227b 2495 list_del(&mad_send_wr->agent_list);
29bb33dd
HR		 2496 if (mad_send_wr->status == IB_WC_SUCCESS &&
2497 !retry_send(mad_send_wr))
f75b7a52
HR		 2498 continue;
2499
1da177e4
LT		 2500 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2501
03b61ad2
HR		 2502 if (mad_send_wr->status == IB_WC_SUCCESS)
2503 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2504 else
2505 mad_send_wc.status = mad_send_wr->status;
34816ad9 2506 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1da177e4
LT		 2507 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2508 &mad_send_wc);
2509
1da177e4
LT		 2510 atomic_dec(&mad_agent_priv->refcount);
2511 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2512 }
2513 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2514}
2515
5dd2ce12 2516static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
1da177e4
LT		 2517{
2518 struct ib_mad_port_private *port_priv = cq->cq_context;
dc05980d 2519 unsigned long flags;
1da177e4 2520
dc05980d
MT		 2521 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2522 if (!list_empty(&port_priv->port_list))
2523 queue_work(port_priv->wq, &port_priv->work);
2524 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
1da177e4
LT		 2525}
2526
2527/*
2528 * Allocate receive MADs and post receive WRs for them
2529 */
2530static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2531 struct ib_mad_private *mad)
2532{
2533 unsigned long flags;
2534 int post, ret;
2535 struct ib_mad_private *mad_priv;
2536 struct ib_sge sg_list;
2537 struct ib_recv_wr recv_wr, *bad_recv_wr;
2538 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2539
2540 /* Initialize common scatter list fields */
2541 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2542 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2543
2544 /* Initialize common receive WR fields */
2545 recv_wr.next = NULL;
2546 recv_wr.sg_list = &sg_list;
2547 recv_wr.num_sge = 1;
2548
2549 do {
2550 /* Allocate and map receive buffer */
2551 if (mad) {
2552 mad_priv = mad;
2553 mad = NULL;
2554 } else {
2555 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2556 if (!mad_priv) {
2557 printk(KERN_ERR PFX "No memory for receive buffer\n");
2558 ret = -ENOMEM;
2559 break;
2560 }
2561 }
1527106f
RC		 2562 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2563 &mad_priv->grh,
2564 sizeof *mad_priv -
2565 sizeof mad_priv->header,
2566 DMA_FROM_DEVICE);
2567 mad_priv->header.mapping = sg_list.addr;
1da177e4
LT		 2568 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2569 mad_priv->header.mad_list.mad_queue = recv_queue;
2570
2571 /* Post receive WR */
2572 spin_lock_irqsave(&recv_queue->lock, flags);
2573 post = (++recv_queue->count < recv_queue->max_active);
2574 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2575 spin_unlock_irqrestore(&recv_queue->lock, flags);
2576 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2577 if (ret) {
2578 spin_lock_irqsave(&recv_queue->lock, flags);
2579 list_del(&mad_priv->header.mad_list.list);
2580 recv_queue->count--;
2581 spin_unlock_irqrestore(&recv_queue->lock, flags);
1527106f
RC		 2582 ib_dma_unmap_single(qp_info->port_priv->device,
2583 mad_priv->header.mapping,
2584 sizeof *mad_priv -
2585 sizeof mad_priv->header,
2586 DMA_FROM_DEVICE);
1da177e4
LT		 2587 kmem_cache_free(ib_mad_cache, mad_priv);
2588 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2589 break;
2590 }
2591 } while (post);
2592
2593 return ret;
2594}
2595
2596/*
2597 * Return all the posted receive MADs
2598 */
2599static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2600{
2601 struct ib_mad_private_header *mad_priv_hdr;
2602 struct ib_mad_private *recv;
2603 struct ib_mad_list_head *mad_list;
2604
2605 while (!list_empty(&qp_info->recv_queue.list)) {
2606
2607 mad_list = list_entry(qp_info->recv_queue.list.next,
2608 struct ib_mad_list_head, list);
2609 mad_priv_hdr = container_of(mad_list,
2610 struct ib_mad_private_header,
2611 mad_list);
2612 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2613 header);
2614
2615 /* Remove from posted receive MAD list */
2616 list_del(&mad_list->list);
2617
1527106f
RC		 2618 ib_dma_unmap_single(qp_info->port_priv->device,
2619 recv->header.mapping,
2620 sizeof(struct ib_mad_private) -
2621 sizeof(struct ib_mad_private_header),
2622 DMA_FROM_DEVICE);
1da177e4
LT		 2623 kmem_cache_free(ib_mad_cache, recv);
2624 }
2625
2626 qp_info->recv_queue.count = 0;
2627}
2628
2629/*
2630 * Start the port
2631 */
2632static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2633{
2634 int ret, i;
2635 struct ib_qp_attr *attr;
2636 struct ib_qp *qp;
2637
2638 attr = kmalloc(sizeof *attr, GFP_KERNEL);
3cd96564 2639 if (!attr) {
1da177e4
LT		 2640 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2641 return -ENOMEM;
2642 }
2643
2644 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2645 qp = port_priv->qp_info[i].qp;
2646 /*
2647 * PKey index for QP1 is irrelevant but
2648 * one is needed for the Reset to Init transition
2649 */
2650 attr->qp_state = IB_QPS_INIT;
2651 attr->pkey_index = 0;
2652 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2653 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2654 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2655 if (ret) {
2656 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2657 "INIT: %d\n", i, ret);
2658 goto out;
2659 }
2660
2661 attr->qp_state = IB_QPS_RTR;
2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2663 if (ret) {
2664 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2665 "RTR: %d\n", i, ret);
2666 goto out;
2667 }
2668
2669 attr->qp_state = IB_QPS_RTS;
2670 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2672 if (ret) {
2673 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674 "RTS: %d\n", i, ret);
2675 goto out;
2676 }
2677 }
2678
2679 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2680 if (ret) {
2681 printk(KERN_ERR PFX "Failed to request completion "
2682 "notification: %d\n", ret);
2683 goto out;
2684 }
2685
2686 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2687 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2688 if (ret) {
2689 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2690 goto out;
2691 }
2692 }
2693out:
2694 kfree(attr);
2695 return ret;
2696}
2697
2698static void qp_event_handler(struct ib_event *event, void *qp_context)
2699{
2700 struct ib_mad_qp_info *qp_info = qp_context;
2701
2702 /* It's worse than that! He's dead, Jim! */
2703 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2704 event->event, qp_info->qp->qp_num);
2705}
2706
2707static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2708 struct ib_mad_queue *mad_queue)
2709{
2710 mad_queue->qp_info = qp_info;
2711 mad_queue->count = 0;
2712 spin_lock_init(&mad_queue->lock);
2713 INIT_LIST_HEAD(&mad_queue->list);
2714}
2715
2716static void init_mad_qp(struct ib_mad_port_private *port_priv,
2717 struct ib_mad_qp_info *qp_info)
2718{
2719 qp_info->port_priv = port_priv;
2720 init_mad_queue(qp_info, &qp_info->send_queue);
2721 init_mad_queue(qp_info, &qp_info->recv_queue);
2722 INIT_LIST_HEAD(&qp_info->overflow_list);
2723 spin_lock_init(&qp_info->snoop_lock);
2724 qp_info->snoop_table = NULL;
2725 qp_info->snoop_table_size = 0;
2726 atomic_set(&qp_info->snoop_count, 0);
2727}
2728
2729static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2730 enum ib_qp_type qp_type)
2731{
2732 struct ib_qp_init_attr qp_init_attr;
2733 int ret;
2734
2735 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2736 qp_init_attr.send_cq = qp_info->port_priv->cq;
2737 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2738 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2739 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2740 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2741 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2742 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2743 qp_init_attr.qp_type = qp_type;
2744 qp_init_attr.port_num = qp_info->port_priv->port_num;
2745 qp_init_attr.qp_context = qp_info;
2746 qp_init_attr.event_handler = qp_event_handler;
2747 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2748 if (IS_ERR(qp_info->qp)) {
2749 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2750 get_spl_qp_index(qp_type));
2751 ret = PTR_ERR(qp_info->qp);
2752 goto error;
2753 }
2754 /* Use minimum queue sizes unless the CQ is resized */
2755 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2756 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2757 return 0;
2758
2759error:
2760 return ret;
2761}
2762
2763static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2764{
2765 ib_destroy_qp(qp_info->qp);
6044ec88 2766 kfree(qp_info->snoop_table);
1da177e4
LT		 2767}
2768
2769/*
2770 * Open the port
2771 * Create the QP, PD, MR, and CQ if needed
2772 */
2773static int ib_mad_port_open(struct ib_device *device,
2774 int port_num)
2775{
2776 int ret, cq_size;
2777 struct ib_mad_port_private *port_priv;
2778 unsigned long flags;
2779 char name[sizeof "ib_mad123"];
2780
1da177e4 2781 /* Create new device info */
de6eb66b 2782 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
1da177e4
LT		 2783 if (!port_priv) {
2784 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2785 return -ENOMEM;
2786 }
de6eb66b 2787
1da177e4
LT		 2788 port_priv->device = device;
2789 port_priv->port_num = port_num;
2790 spin_lock_init(&port_priv->reg_lock);
2791 INIT_LIST_HEAD(&port_priv->agent_list);
2792 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2793 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2794
2795 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2796 port_priv->cq = ib_create_cq(port_priv->device,
5dd2ce12 2797 ib_mad_thread_completion_handler,
f4fd0b22 2798 NULL, port_priv, cq_size, 0);
1da177e4
LT		 2799 if (IS_ERR(port_priv->cq)) {
2800 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2801 ret = PTR_ERR(port_priv->cq);
2802 goto error3;
2803 }
2804
2805 port_priv->pd = ib_alloc_pd(device);
2806 if (IS_ERR(port_priv->pd)) {
2807 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2808 ret = PTR_ERR(port_priv->pd);
2809 goto error4;
2810 }
2811
2812 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2813 if (IS_ERR(port_priv->mr)) {
2814 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2815 ret = PTR_ERR(port_priv->mr);
2816 goto error5;
2817 }
2818
2819 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2820 if (ret)
2821 goto error6;
2822 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2823 if (ret)
2824 goto error7;
2825
2826 snprintf(name, sizeof name, "ib_mad%d", port_num);
2827 port_priv->wq = create_singlethread_workqueue(name);
2828 if (!port_priv->wq) {
2829 ret = -ENOMEM;
2830 goto error8;
2831 }
c4028958 2832 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
1da177e4 2833
dc05980d
MT		 2834 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2835 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2836 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2837
1da177e4
LT		 2838 ret = ib_mad_port_start(port_priv);
2839 if (ret) {
2840 printk(KERN_ERR PFX "Couldn't start port\n");
2841 goto error9;
2842 }
2843
1da177e4
LT		 2844 return 0;
2845
2846error9:
dc05980d
MT		 2847 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2848 list_del_init(&port_priv->port_list);
2849 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2850
1da177e4
LT		 2851 destroy_workqueue(port_priv->wq);
2852error8:
2853 destroy_mad_qp(&port_priv->qp_info[1]);
2854error7:
2855 destroy_mad_qp(&port_priv->qp_info[0]);
2856error6:
2857 ib_dereg_mr(port_priv->mr);
2858error5:
2859 ib_dealloc_pd(port_priv->pd);
2860error4:
2861 ib_destroy_cq(port_priv->cq);
2862 cleanup_recv_queue(&port_priv->qp_info[1]);
2863 cleanup_recv_queue(&port_priv->qp_info[0]);
2864error3:
2865 kfree(port_priv);
2866
2867 return ret;
2868}
2869
2870/*
2871 * Close the port
2872 * If there are no classes using the port, free the port
2873 * resources (CQ, MR, PD, QP) and remove the port's info structure
2874 */
2875static int ib_mad_port_close(struct ib_device *device, int port_num)
2876{
2877 struct ib_mad_port_private *port_priv;
2878 unsigned long flags;
2879
2880 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2881 port_priv = __ib_get_mad_port(device, port_num);
2882 if (port_priv == NULL) {
2883 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2884 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2885 return -ENODEV;
2886 }
dc05980d 2887 list_del_init(&port_priv->port_list);
1da177e4
LT		 2888 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2889
1da177e4
LT		 2890 destroy_workqueue(port_priv->wq);
2891 destroy_mad_qp(&port_priv->qp_info[1]);
2892 destroy_mad_qp(&port_priv->qp_info[0]);
2893 ib_dereg_mr(port_priv->mr);
2894 ib_dealloc_pd(port_priv->pd);
2895 ib_destroy_cq(port_priv->cq);
2896 cleanup_recv_queue(&port_priv->qp_info[1]);
2897 cleanup_recv_queue(&port_priv->qp_info[0]);
2898 /* XXX: Handle deallocation of MAD registration tables */
2899
2900 kfree(port_priv);
2901
2902 return 0;
2903}
2904
2905static void ib_mad_init_device(struct ib_device *device)
2906{
4ab6fb7e 2907 int start, end, i;
1da177e4 2908
07ebafba
TT		 2909 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2910 return;
2911
2912 if (device->node_type == RDMA_NODE_IB_SWITCH) {
4ab6fb7e
RD		 2913 start = 0;
2914 end = 0;
1da177e4 2915 } else {
4ab6fb7e
RD		 2916 start = 1;
2917 end = device->phys_port_cnt;
1da177e4 2918 }
4ab6fb7e
RD		 2919
2920 for (i = start; i <= end; i++) {
2921 if (ib_mad_port_open(device, i)) {
1da177e4 2922 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
4ab6fb7e
RD		 2923 device->name, i);
2924 goto error;
1da177e4 2925 }
4ab6fb7e 2926 if (ib_agent_port_open(device, i)) {
1da177e4
LT		 2927 printk(KERN_ERR PFX "Couldn't open %s port %d "
2928 "for agents\n",
4ab6fb7e
RD		 2929 device->name, i);
2930 goto error_agent;
1da177e4
LT		 2931 }
2932 }
f68bcc2d 2933 return;
1da177e4 2934
4ab6fb7e
RD		 2935error_agent:
2936 if (ib_mad_port_close(device, i))
2937 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2938 device->name, i);
2939
2940error:
2941 i--;
2942
2943 while (i >= start) {
2944 if (ib_agent_port_close(device, i))
1da177e4
LT		 2945 printk(KERN_ERR PFX "Couldn't close %s port %d "
2946 "for agents\n",
4ab6fb7e
RD		 2947 device->name, i);
2948 if (ib_mad_port_close(device, i))
1da177e4 2949 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
4ab6fb7e 2950 device->name, i);
1da177e4
LT		 2951 i--;
2952 }
1da177e4
LT		 2953}
2954
2955static void ib_mad_remove_device(struct ib_device *device)
2956{
f68bcc2d 2957 int i, num_ports, cur_port;
1da177e4 2958
07ebafba 2959 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1da177e4
LT		 2960 num_ports = 1;
2961 cur_port = 0;
2962 } else {
2963 num_ports = device->phys_port_cnt;
2964 cur_port = 1;
2965 }
2966 for (i = 0; i < num_ports; i++, cur_port++) {
f68bcc2d 2967 if (ib_agent_port_close(device, cur_port))
1da177e4
LT		 2968 printk(KERN_ERR PFX "Couldn't close %s port %d "
2969 "for agents\n",
2970 device->name, cur_port);
f68bcc2d 2971 if (ib_mad_port_close(device, cur_port))
1da177e4
LT		 2972 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2973 device->name, cur_port);
1da177e4
LT		 2974 }
2975}
2976
2977static struct ib_client mad_client = {
2978 .name = "mad",
2979 .add = ib_mad_init_device,
2980 .remove = ib_mad_remove_device
2981};
2982
2983static int __init ib_mad_init_module(void)
2984{
2985 int ret;
2986
2987 spin_lock_init(&ib_mad_port_list_lock);
1da177e4
LT		 2988
2989 ib_mad_cache = kmem_cache_create("ib_mad",
2990 sizeof(struct ib_mad_private),
2991 0,
2992 SLAB_HWCACHE_ALIGN,
1da177e4
LT		 2993 NULL);
2994 if (!ib_mad_cache) {
2995 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2996 ret = -ENOMEM;
2997 goto error1;
2998 }
2999
3000 INIT_LIST_HEAD(&ib_mad_port_list);
3001
3002 if (ib_register_client(&mad_client)) {
3003 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3004 ret = -EINVAL;
3005 goto error2;
3006 }
3007
3008 return 0;
3009
3010error2:
3011 kmem_cache_destroy(ib_mad_cache);
3012error1:
3013 return ret;
3014}
3015
3016static void __exit ib_mad_cleanup_module(void)
3017{
3018 ib_unregister_client(&mad_client);
1a1d92c1 3019 kmem_cache_destroy(ib_mad_cache);
1da177e4
LT		 3020}
3021
3022module_init(ib_mad_init_module);
3023module_exit(ib_mad_cleanup_module);
fa619a77 3024
Linux 6.x block layer and io_uring tree(s)