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[PATCH] gfp flags annotations - part 1
[mirror_ubuntu-focal-kernel.git] / drivers / infiniband / core / mad.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (c) 2004, 2005 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 *
fa619a77 34 * $Id: mad.c 2817 2005-07-07 11:29:26Z halr $
1da177e4 35 */
1da177e4 36#include <linux/dma-mapping.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
48
49kmem_cache_t *ib_mad_cache;
fa619a77 50
1da177e4
LT		 51static struct list_head ib_mad_port_list;
52static u32 ib_mad_client_id = 0;
53
54/* Port list lock */
55static spinlock_t ib_mad_port_list_lock;
56
57
58/* Forward declarations */
59static int method_in_use(struct ib_mad_mgmt_method_table **method,
60 struct ib_mad_reg_req *mad_reg_req);
61static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
62static struct ib_mad_agent_private *find_mad_agent(
63 struct ib_mad_port_private *port_priv,
4a0754fa 64 struct ib_mad *mad);
1da177e4
LT		 65static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
66 struct ib_mad_private *mad);
67static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
1da177e4 68static void timeout_sends(void *data);
1da177e4 69static void local_completions(void *data);
1da177e4
LT		 70static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
71 struct ib_mad_agent_private *agent_priv,
72 u8 mgmt_class);
73static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
74 struct ib_mad_agent_private *agent_priv);
75
76/*
77 * Returns a ib_mad_port_private structure or NULL for a device/port
78 * Assumes ib_mad_port_list_lock is being held
79 */
80static inline struct ib_mad_port_private *
81__ib_get_mad_port(struct ib_device *device, int port_num)
82{
83 struct ib_mad_port_private *entry;
84
85 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
86 if (entry->device == device && entry->port_num == port_num)
87 return entry;
88 }
89 return NULL;
90}
91
92/*
93 * Wrapper function to return a ib_mad_port_private structure or NULL
94 * for a device/port
95 */
96static inline struct ib_mad_port_private *
97ib_get_mad_port(struct ib_device *device, int port_num)
98{
99 struct ib_mad_port_private *entry;
100 unsigned long flags;
101
102 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
103 entry = __ib_get_mad_port(device, port_num);
104 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
105
106 return entry;
107}
108
109static inline u8 convert_mgmt_class(u8 mgmt_class)
110{
111 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
112 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
113 0 : mgmt_class;
114}
115
116static int get_spl_qp_index(enum ib_qp_type qp_type)
117{
118 switch (qp_type)
119 {
120 case IB_QPT_SMI:
121 return 0;
122 case IB_QPT_GSI:
123 return 1;
124 default:
125 return -1;
126 }
127}
128
129static int vendor_class_index(u8 mgmt_class)
130{
131 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
132}
133
134static int is_vendor_class(u8 mgmt_class)
135{
136 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
137 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
138 return 0;
139 return 1;
140}
141
142static int is_vendor_oui(char *oui)
143{
144 if (oui[0] || oui[1] || oui[2])
145 return 1;
146 return 0;
147}
148
149static int is_vendor_method_in_use(
150 struct ib_mad_mgmt_vendor_class *vendor_class,
151 struct ib_mad_reg_req *mad_reg_req)
152{
153 struct ib_mad_mgmt_method_table *method;
154 int i;
155
156 for (i = 0; i < MAX_MGMT_OUI; i++) {
157 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
158 method = vendor_class->method_table[i];
159 if (method) {
160 if (method_in_use(&method, mad_reg_req))
161 return 1;
162 else
163 break;
164 }
165 }
166 }
167 return 0;
168}
169
170/*
171 * ib_register_mad_agent - Register to send/receive MADs
172 */
173struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
174 u8 port_num,
175 enum ib_qp_type qp_type,
176 struct ib_mad_reg_req *mad_reg_req,
177 u8 rmpp_version,
178 ib_mad_send_handler send_handler,
179 ib_mad_recv_handler recv_handler,
180 void *context)
181{
182 struct ib_mad_port_private *port_priv;
183 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
184 struct ib_mad_agent_private *mad_agent_priv;
185 struct ib_mad_reg_req *reg_req = NULL;
186 struct ib_mad_mgmt_class_table *class;
187 struct ib_mad_mgmt_vendor_class_table *vendor;
188 struct ib_mad_mgmt_vendor_class *vendor_class;
189 struct ib_mad_mgmt_method_table *method;
190 int ret2, qpn;
191 unsigned long flags;
192 u8 mgmt_class, vclass;
193
194 /* Validate parameters */
195 qpn = get_spl_qp_index(qp_type);
196 if (qpn == -1)
197 goto error1;
198
fa619a77
HR		 199 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
200 goto error1;
1da177e4
LT		 201
202 /* Validate MAD registration request if supplied */
203 if (mad_reg_req) {
204 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
205 goto error1;
206 if (!recv_handler)
207 goto error1;
208 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
209 /*
210 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
211 * one in this range currently allowed
212 */
213 if (mad_reg_req->mgmt_class !=
214 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
215 goto error1;
216 } else if (mad_reg_req->mgmt_class == 0) {
217 /*
218 * Class 0 is reserved in IBA and is used for
219 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
220 */
221 goto error1;
222 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
223 /*
224 * If class is in "new" vendor range,
225 * ensure supplied OUI is not zero
226 */
227 if (!is_vendor_oui(mad_reg_req->oui))
228 goto error1;
229 }
230 /* Make sure class supplied is consistent with QP type */
231 if (qp_type == IB_QPT_SMI) {
232 if ((mad_reg_req->mgmt_class !=
233 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
234 (mad_reg_req->mgmt_class !=
235 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
236 goto error1;
237 } else {
238 if ((mad_reg_req->mgmt_class ==
239 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
240 (mad_reg_req->mgmt_class ==
241 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
242 goto error1;
243 }
244 } else {
245 /* No registration request supplied */
246 if (!send_handler)
247 goto error1;
248 }
249
250 /* Validate device and port */
251 port_priv = ib_get_mad_port(device, port_num);
252 if (!port_priv) {
253 ret = ERR_PTR(-ENODEV);
254 goto error1;
255 }
256
257 /* Allocate structures */
258 mad_agent_priv = kmalloc(sizeof *mad_agent_priv, GFP_KERNEL);
259 if (!mad_agent_priv) {
260 ret = ERR_PTR(-ENOMEM);
261 goto error1;
262 }
b82cab6b
HR		 263 memset(mad_agent_priv, 0, sizeof *mad_agent_priv);
264
265 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
266 IB_ACCESS_LOCAL_WRITE);
267 if (IS_ERR(mad_agent_priv->agent.mr)) {
268 ret = ERR_PTR(-ENOMEM);
269 goto error2;
270 }
1da177e4
LT		 271
272 if (mad_reg_req) {
273 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
274 if (!reg_req) {
275 ret = ERR_PTR(-ENOMEM);
b82cab6b 276 goto error3;
1da177e4
LT		 277 }
278 /* Make a copy of the MAD registration request */
279 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
280 }
281
282 /* Now, fill in the various structures */
1da177e4
LT		 283 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
284 mad_agent_priv->reg_req = reg_req;
fa619a77 285 mad_agent_priv->agent.rmpp_version = rmpp_version;
1da177e4
LT		 286 mad_agent_priv->agent.device = device;
287 mad_agent_priv->agent.recv_handler = recv_handler;
288 mad_agent_priv->agent.send_handler = send_handler;
289 mad_agent_priv->agent.context = context;
290 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
291 mad_agent_priv->agent.port_num = port_num;
292
293 spin_lock_irqsave(&port_priv->reg_lock, flags);
294 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
295
296 /*
297 * Make sure MAD registration (if supplied)
298 * is non overlapping with any existing ones
299 */
300 if (mad_reg_req) {
301 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
302 if (!is_vendor_class(mgmt_class)) {
303 class = port_priv->version[mad_reg_req->
304 mgmt_class_version].class;
305 if (class) {
306 method = class->method_table[mgmt_class];
307 if (method) {
308 if (method_in_use(&method,
309 mad_reg_req))
b82cab6b 310 goto error4;
1da177e4
LT		 311 }
312 }
313 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
314 mgmt_class);
315 } else {
316 /* "New" vendor class range */
317 vendor = port_priv->version[mad_reg_req->
318 mgmt_class_version].vendor;
319 if (vendor) {
320 vclass = vendor_class_index(mgmt_class);
321 vendor_class = vendor->vendor_class[vclass];
322 if (vendor_class) {
323 if (is_vendor_method_in_use(
324 vendor_class,
325 mad_reg_req))
b82cab6b 326 goto error4;
1da177e4
LT		 327 }
328 }
329 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
330 }
331 if (ret2) {
332 ret = ERR_PTR(ret2);
b82cab6b 333 goto error4;
1da177e4
LT		 334 }
335 }
336
337 /* Add mad agent into port's agent list */
338 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
339 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
340
341 spin_lock_init(&mad_agent_priv->lock);
342 INIT_LIST_HEAD(&mad_agent_priv->send_list);
343 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
6a0c435e 344 INIT_LIST_HEAD(&mad_agent_priv->done_list);
fa619a77 345 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
1da177e4
LT		 346 INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
347 INIT_LIST_HEAD(&mad_agent_priv->local_list);
348 INIT_WORK(&mad_agent_priv->local_work, local_completions,
349 mad_agent_priv);
1da177e4
LT		 350 atomic_set(&mad_agent_priv->refcount, 1);
351 init_waitqueue_head(&mad_agent_priv->wait);
352
353 return &mad_agent_priv->agent;
354
b82cab6b 355error4:
1da177e4
LT		 356 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
357 kfree(reg_req);
b82cab6b 358error3:
1da177e4 359 kfree(mad_agent_priv);
b82cab6b
HR		 360error2:
361 ib_dereg_mr(mad_agent_priv->agent.mr);
1da177e4
LT		 362error1:
363 return ret;
364}
365EXPORT_SYMBOL(ib_register_mad_agent);
366
367static inline int is_snooping_sends(int mad_snoop_flags)
368{
369 return (mad_snoop_flags &
370 (/*IB_MAD_SNOOP_POSTED_SENDS |
371 IB_MAD_SNOOP_RMPP_SENDS |*/
372 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
373 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
374}
375
376static inline int is_snooping_recvs(int mad_snoop_flags)
377{
378 return (mad_snoop_flags &
379 (IB_MAD_SNOOP_RECVS /*|
380 IB_MAD_SNOOP_RMPP_RECVS*/));
381}
382
383static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
384 struct ib_mad_snoop_private *mad_snoop_priv)
385{
386 struct ib_mad_snoop_private **new_snoop_table;
387 unsigned long flags;
388 int i;
389
390 spin_lock_irqsave(&qp_info->snoop_lock, flags);
391 /* Check for empty slot in array. */
392 for (i = 0; i < qp_info->snoop_table_size; i++)
393 if (!qp_info->snoop_table[i])
394 break;
395
396 if (i == qp_info->snoop_table_size) {
397 /* Grow table. */
398 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
399 qp_info->snoop_table_size + 1,
400 GFP_ATOMIC);
401 if (!new_snoop_table) {
402 i = -ENOMEM;
403 goto out;
404 }
405 if (qp_info->snoop_table) {
406 memcpy(new_snoop_table, qp_info->snoop_table,
407 sizeof mad_snoop_priv *
408 qp_info->snoop_table_size);
409 kfree(qp_info->snoop_table);
410 }
411 qp_info->snoop_table = new_snoop_table;
412 qp_info->snoop_table_size++;
413 }
414 qp_info->snoop_table[i] = mad_snoop_priv;
415 atomic_inc(&qp_info->snoop_count);
416out:
417 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
418 return i;
419}
420
421struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
422 u8 port_num,
423 enum ib_qp_type qp_type,
424 int mad_snoop_flags,
425 ib_mad_snoop_handler snoop_handler,
426 ib_mad_recv_handler recv_handler,
427 void *context)
428{
429 struct ib_mad_port_private *port_priv;
430 struct ib_mad_agent *ret;
431 struct ib_mad_snoop_private *mad_snoop_priv;
432 int qpn;
433
434 /* Validate parameters */
435 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
436 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
437 ret = ERR_PTR(-EINVAL);
438 goto error1;
439 }
440 qpn = get_spl_qp_index(qp_type);
441 if (qpn == -1) {
442 ret = ERR_PTR(-EINVAL);
443 goto error1;
444 }
445 port_priv = ib_get_mad_port(device, port_num);
446 if (!port_priv) {
447 ret = ERR_PTR(-ENODEV);
448 goto error1;
449 }
450 /* Allocate structures */
451 mad_snoop_priv = kmalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
452 if (!mad_snoop_priv) {
453 ret = ERR_PTR(-ENOMEM);
454 goto error1;
455 }
456
457 /* Now, fill in the various structures */
458 memset(mad_snoop_priv, 0, sizeof *mad_snoop_priv);
459 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
460 mad_snoop_priv->agent.device = device;
461 mad_snoop_priv->agent.recv_handler = recv_handler;
462 mad_snoop_priv->agent.snoop_handler = snoop_handler;
463 mad_snoop_priv->agent.context = context;
464 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
465 mad_snoop_priv->agent.port_num = port_num;
466 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
467 init_waitqueue_head(&mad_snoop_priv->wait);
468 mad_snoop_priv->snoop_index = register_snoop_agent(
469 &port_priv->qp_info[qpn],
470 mad_snoop_priv);
471 if (mad_snoop_priv->snoop_index < 0) {
472 ret = ERR_PTR(mad_snoop_priv->snoop_index);
473 goto error2;
474 }
475
476 atomic_set(&mad_snoop_priv->refcount, 1);
477 return &mad_snoop_priv->agent;
478
479error2:
480 kfree(mad_snoop_priv);
481error1:
482 return ret;
483}
484EXPORT_SYMBOL(ib_register_mad_snoop);
485
486static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
487{
488 struct ib_mad_port_private *port_priv;
489 unsigned long flags;
490
491 /* Note that we could still be handling received MADs */
492
493 /*
494 * Canceling all sends results in dropping received response
495 * MADs, preventing us from queuing additional work
496 */
497 cancel_mads(mad_agent_priv);
1da177e4 498 port_priv = mad_agent_priv->qp_info->port_priv;
1da177e4 499 cancel_delayed_work(&mad_agent_priv->timed_work);
1da177e4
LT		 500
501 spin_lock_irqsave(&port_priv->reg_lock, flags);
502 remove_mad_reg_req(mad_agent_priv);
503 list_del(&mad_agent_priv->agent_list);
504 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
505
b82cab6b 506 flush_workqueue(port_priv->wq);
fa619a77 507 ib_cancel_rmpp_recvs(mad_agent_priv);
1da177e4
LT		 508
509 atomic_dec(&mad_agent_priv->refcount);
510 wait_event(mad_agent_priv->wait,
511 !atomic_read(&mad_agent_priv->refcount));
512
513 if (mad_agent_priv->reg_req)
514 kfree(mad_agent_priv->reg_req);
b82cab6b 515 ib_dereg_mr(mad_agent_priv->agent.mr);
1da177e4
LT		 516 kfree(mad_agent_priv);
517}
518
519static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
520{
521 struct ib_mad_qp_info *qp_info;
522 unsigned long flags;
523
524 qp_info = mad_snoop_priv->qp_info;
525 spin_lock_irqsave(&qp_info->snoop_lock, flags);
526 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
527 atomic_dec(&qp_info->snoop_count);
528 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
529
530 atomic_dec(&mad_snoop_priv->refcount);
531 wait_event(mad_snoop_priv->wait,
532 !atomic_read(&mad_snoop_priv->refcount));
533
534 kfree(mad_snoop_priv);
535}
536
537/*
538 * ib_unregister_mad_agent - Unregisters a client from using MAD services
539 */
540int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
541{
542 struct ib_mad_agent_private *mad_agent_priv;
543 struct ib_mad_snoop_private *mad_snoop_priv;
544
545 /* If the TID is zero, the agent can only snoop. */
546 if (mad_agent->hi_tid) {
547 mad_agent_priv = container_of(mad_agent,
548 struct ib_mad_agent_private,
549 agent);
550 unregister_mad_agent(mad_agent_priv);
551 } else {
552 mad_snoop_priv = container_of(mad_agent,
553 struct ib_mad_snoop_private,
554 agent);
555 unregister_mad_snoop(mad_snoop_priv);
556 }
557 return 0;
558}
559EXPORT_SYMBOL(ib_unregister_mad_agent);
560
4a0754fa
HR		 561static inline int response_mad(struct ib_mad *mad)
562{
563 /* Trap represses are responses although response bit is reset */
564 return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
565 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
566}
567
1da177e4
LT		 568static void dequeue_mad(struct ib_mad_list_head *mad_list)
569{
570 struct ib_mad_queue *mad_queue;
571 unsigned long flags;
572
573 BUG_ON(!mad_list->mad_queue);
574 mad_queue = mad_list->mad_queue;
575 spin_lock_irqsave(&mad_queue->lock, flags);
576 list_del(&mad_list->list);
577 mad_queue->count--;
578 spin_unlock_irqrestore(&mad_queue->lock, flags);
579}
580
581static void snoop_send(struct ib_mad_qp_info *qp_info,
582 struct ib_send_wr *send_wr,
583 struct ib_mad_send_wc *mad_send_wc,
584 int mad_snoop_flags)
585{
586 struct ib_mad_snoop_private *mad_snoop_priv;
587 unsigned long flags;
588 int i;
589
590 spin_lock_irqsave(&qp_info->snoop_lock, flags);
591 for (i = 0; i < qp_info->snoop_table_size; i++) {
592 mad_snoop_priv = qp_info->snoop_table[i];
593 if (!mad_snoop_priv ||
594 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
595 continue;
596
597 atomic_inc(&mad_snoop_priv->refcount);
598 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
599 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
600 send_wr, mad_send_wc);
601 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
602 wake_up(&mad_snoop_priv->wait);
603 spin_lock_irqsave(&qp_info->snoop_lock, flags);
604 }
605 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
606}
607
608static void snoop_recv(struct ib_mad_qp_info *qp_info,
609 struct ib_mad_recv_wc *mad_recv_wc,
610 int mad_snoop_flags)
611{
612 struct ib_mad_snoop_private *mad_snoop_priv;
613 unsigned long flags;
614 int i;
615
616 spin_lock_irqsave(&qp_info->snoop_lock, flags);
617 for (i = 0; i < qp_info->snoop_table_size; i++) {
618 mad_snoop_priv = qp_info->snoop_table[i];
619 if (!mad_snoop_priv ||
620 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
621 continue;
622
623 atomic_inc(&mad_snoop_priv->refcount);
624 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
625 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
626 mad_recv_wc);
627 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
628 wake_up(&mad_snoop_priv->wait);
629 spin_lock_irqsave(&qp_info->snoop_lock, flags);
630 }
631 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
632}
633
634static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
635 struct ib_wc *wc)
636{
637 memset(wc, 0, sizeof *wc);
638 wc->wr_id = wr_id;
639 wc->status = IB_WC_SUCCESS;
640 wc->opcode = IB_WC_RECV;
641 wc->pkey_index = pkey_index;
642 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
643 wc->src_qp = IB_QP0;
644 wc->qp_num = IB_QP0;
645 wc->slid = slid;
646 wc->sl = 0;
647 wc->dlid_path_bits = 0;
648 wc->port_num = port_num;
649}
650
651/*
652 * Return 0 if SMP is to be sent
653 * Return 1 if SMP was consumed locally (whether or not solicited)
654 * Return < 0 if error
655 */
656static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
657 struct ib_smp *smp,
658 struct ib_send_wr *send_wr)
659{
4a0754fa 660 int ret;
1da177e4
LT		 661 unsigned long flags;
662 struct ib_mad_local_private *local;
663 struct ib_mad_private *mad_priv;
664 struct ib_mad_port_private *port_priv;
665 struct ib_mad_agent_private *recv_mad_agent = NULL;
666 struct ib_device *device = mad_agent_priv->agent.device;
667 u8 port_num = mad_agent_priv->agent.port_num;
668 struct ib_wc mad_wc;
669
670 if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
671 ret = -EINVAL;
672 printk(KERN_ERR PFX "Invalid directed route\n");
673 goto out;
674 }
675 /* Check to post send on QP or process locally */
676 ret = smi_check_local_dr_smp(smp, device, port_num);
677 if (!ret || !device->process_mad)
678 goto out;
679
680 local = kmalloc(sizeof *local, GFP_ATOMIC);
681 if (!local) {
682 ret = -ENOMEM;
683 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
684 goto out;
685 }
686 local->mad_priv = NULL;
687 local->recv_mad_agent = NULL;
688 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
689 if (!mad_priv) {
690 ret = -ENOMEM;
691 printk(KERN_ERR PFX "No memory for local response MAD\n");
692 kfree(local);
693 goto out;
694 }
695
97f52eb4
SH		 696 build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
697 send_wr->wr.ud.pkey_index,
1da177e4
LT		 698 send_wr->wr.ud.port_num, &mad_wc);
699
700 /* No GRH for DR SMP */
701 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
702 (struct ib_mad *)smp,
703 (struct ib_mad *)&mad_priv->mad);
704 switch (ret)
705 {
706 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
4a0754fa 707 if (response_mad(&mad_priv->mad.mad) &&
1da177e4
LT		 708 mad_agent_priv->agent.recv_handler) {
709 local->mad_priv = mad_priv;
710 local->recv_mad_agent = mad_agent_priv;
711 /*
712 * Reference MAD agent until receive
713 * side of local completion handled
714 */
715 atomic_inc(&mad_agent_priv->refcount);
716 } else
717 kmem_cache_free(ib_mad_cache, mad_priv);
718 break;
719 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
720 kmem_cache_free(ib_mad_cache, mad_priv);
721 break;
722 case IB_MAD_RESULT_SUCCESS:
723 /* Treat like an incoming receive MAD */
1da177e4
LT		 724 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
725 mad_agent_priv->agent.port_num);
726 if (port_priv) {
727 mad_priv->mad.mad.mad_hdr.tid =
728 ((struct ib_mad *)smp)->mad_hdr.tid;
729 recv_mad_agent = find_mad_agent(port_priv,
4a0754fa 730 &mad_priv->mad.mad);
1da177e4
LT		 731 }
732 if (!port_priv || !recv_mad_agent) {
733 kmem_cache_free(ib_mad_cache, mad_priv);
734 kfree(local);
735 ret = 0;
736 goto out;
737 }
738 local->mad_priv = mad_priv;
739 local->recv_mad_agent = recv_mad_agent;
740 break;
741 default:
742 kmem_cache_free(ib_mad_cache, mad_priv);
743 kfree(local);
744 ret = -EINVAL;
745 goto out;
746 }
747
748 local->send_wr = *send_wr;
749 local->send_wr.sg_list = local->sg_list;
750 memcpy(local->sg_list, send_wr->sg_list,
751 sizeof *send_wr->sg_list * send_wr->num_sge);
752 local->send_wr.next = NULL;
753 local->tid = send_wr->wr.ud.mad_hdr->tid;
754 local->wr_id = send_wr->wr_id;
755 /* Reference MAD agent until send side of local completion handled */
756 atomic_inc(&mad_agent_priv->refcount);
757 /* Queue local completion to local list */
758 spin_lock_irqsave(&mad_agent_priv->lock, flags);
759 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
760 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
761 queue_work(mad_agent_priv->qp_info->port_priv->wq,
b82cab6b 762 &mad_agent_priv->local_work);
1da177e4
LT		 763 ret = 1;
764out:
765 return ret;
766}
767
824c8ae7
HR		 768static int get_buf_length(int hdr_len, int data_len)
769{
770 int seg_size, pad;
771
772 seg_size = sizeof(struct ib_mad) - hdr_len;
773 if (data_len && seg_size) {
774 pad = seg_size - data_len % seg_size;
775 if (pad == seg_size)
776 pad = 0;
777 } else
778 pad = seg_size;
779 return hdr_len + data_len + pad;
780}
781
782struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
783 u32 remote_qpn, u16 pkey_index,
d2082ee5 784 struct ib_ah *ah, int rmpp_active,
824c8ae7 785 int hdr_len, int data_len,
dd0fc66f 786 gfp_t gfp_mask)
824c8ae7
HR		 787{
788 struct ib_mad_agent_private *mad_agent_priv;
789 struct ib_mad_send_buf *send_buf;
790 int buf_size;
791 void *buf;
792
793 mad_agent_priv = container_of(mad_agent,
794 struct ib_mad_agent_private, agent);
795 buf_size = get_buf_length(hdr_len, data_len);
796
fa619a77
HR		 797 if ((!mad_agent->rmpp_version &&
798 (rmpp_active || buf_size > sizeof(struct ib_mad))) ||
799 (!rmpp_active && buf_size > sizeof(struct ib_mad)))
800 return ERR_PTR(-EINVAL);
801
824c8ae7
HR		 802 buf = kmalloc(sizeof *send_buf + buf_size, gfp_mask);
803 if (!buf)
804 return ERR_PTR(-ENOMEM);
df9f9ead 805 memset(buf, 0, sizeof *send_buf + buf_size);
824c8ae7
HR		 806
807 send_buf = buf + buf_size;
824c8ae7
HR		 808 send_buf->mad = buf;
809
810 send_buf->sge.addr = dma_map_single(mad_agent->device->dma_device,
811 buf, buf_size, DMA_TO_DEVICE);
812 pci_unmap_addr_set(send_buf, mapping, send_buf->sge.addr);
813 send_buf->sge.length = buf_size;
814 send_buf->sge.lkey = mad_agent->mr->lkey;
815
816 send_buf->send_wr.wr_id = (unsigned long) send_buf;
817 send_buf->send_wr.sg_list = &send_buf->sge;
818 send_buf->send_wr.num_sge = 1;
819 send_buf->send_wr.opcode = IB_WR_SEND;
820 send_buf->send_wr.send_flags = IB_SEND_SIGNALED;
821 send_buf->send_wr.wr.ud.ah = ah;
822 send_buf->send_wr.wr.ud.mad_hdr = &send_buf->mad->mad_hdr;
823 send_buf->send_wr.wr.ud.remote_qpn = remote_qpn;
824 send_buf->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
825 send_buf->send_wr.wr.ud.pkey_index = pkey_index;
fa619a77
HR		 826
827 if (rmpp_active) {
828 struct ib_rmpp_mad *rmpp_mad;
829 rmpp_mad = (struct ib_rmpp_mad *)send_buf->mad;
830 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(hdr_len -
831 offsetof(struct ib_rmpp_mad, data) + data_len);
832 rmpp_mad->rmpp_hdr.rmpp_version = mad_agent->rmpp_version;
833 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
834 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr,
835 IB_MGMT_RMPP_FLAG_ACTIVE);
836 }
837
824c8ae7
HR		 838 send_buf->mad_agent = mad_agent;
839 atomic_inc(&mad_agent_priv->refcount);
840 return send_buf;
841}
842EXPORT_SYMBOL(ib_create_send_mad);
843
844void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
845{
846 struct ib_mad_agent_private *mad_agent_priv;
847
848 mad_agent_priv = container_of(send_buf->mad_agent,
849 struct ib_mad_agent_private, agent);
850
851 dma_unmap_single(send_buf->mad_agent->device->dma_device,
852 pci_unmap_addr(send_buf, mapping),
853 send_buf->sge.length, DMA_TO_DEVICE);
854 kfree(send_buf->mad);
855
856 if (atomic_dec_and_test(&mad_agent_priv->refcount))
857 wake_up(&mad_agent_priv->wait);
858}
859EXPORT_SYMBOL(ib_free_send_mad);
860
fa619a77 861int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4
LT		 862{
863 struct ib_mad_qp_info *qp_info;
864 struct ib_send_wr *bad_send_wr;
cabe3cbc 865 struct list_head *list;
1da177e4
LT		 866 unsigned long flags;
867 int ret;
868
f8197a4e 869 /* Set WR ID to find mad_send_wr upon completion */
d760ce8f 870 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1da177e4
LT		 871 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
872 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
873
874 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
cabe3cbc 875 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
d760ce8f 876 ret = ib_post_send(mad_send_wr->mad_agent_priv->agent.qp,
1da177e4 877 &mad_send_wr->send_wr, &bad_send_wr);
cabe3cbc 878 list = &qp_info->send_queue.list;
1da177e4 879 } else {
1da177e4 880 ret = 0;
cabe3cbc 881 list = &qp_info->overflow_list;
1da177e4 882 }
cabe3cbc
HR		 883
884 if (!ret) {
885 qp_info->send_queue.count++;
886 list_add_tail(&mad_send_wr->mad_list.list, list);
887 }
888 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1da177e4
LT		 889 return ret;
890}
891
892/*
893 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
894 * with the registered client
895 */
896int ib_post_send_mad(struct ib_mad_agent *mad_agent,
897 struct ib_send_wr *send_wr,
898 struct ib_send_wr **bad_send_wr)
899{
900 int ret = -EINVAL;
901 struct ib_mad_agent_private *mad_agent_priv;
902
903 /* Validate supplied parameters */
904 if (!bad_send_wr)
905 goto error1;
906
907 if (!mad_agent || !send_wr)
908 goto error2;
909
910 if (!mad_agent->send_handler)
911 goto error2;
912
913 mad_agent_priv = container_of(mad_agent,
914 struct ib_mad_agent_private,
915 agent);
916
917 /* Walk list of send WRs and post each on send list */
918 while (send_wr) {
919 unsigned long flags;
920 struct ib_send_wr *next_send_wr;
921 struct ib_mad_send_wr_private *mad_send_wr;
922 struct ib_smp *smp;
923
924 /* Validate more parameters */
925 if (send_wr->num_sge > IB_MAD_SEND_REQ_MAX_SG)
926 goto error2;
927
928 if (send_wr->wr.ud.timeout_ms && !mad_agent->recv_handler)
929 goto error2;
930
931 if (!send_wr->wr.ud.mad_hdr) {
932 printk(KERN_ERR PFX "MAD header must be supplied "
933 "in WR %p\n", send_wr);
934 goto error2;
935 }
936
937 /*
938 * Save pointer to next work request to post in case the
939 * current one completes, and the user modifies the work
940 * request associated with the completion
941 */
942 next_send_wr = (struct ib_send_wr *)send_wr->next;
943
944 smp = (struct ib_smp *)send_wr->wr.ud.mad_hdr;
945 if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
946 ret = handle_outgoing_dr_smp(mad_agent_priv, smp,
947 send_wr);
948 if (ret < 0) /* error */
949 goto error2;
950 else if (ret == 1) /* locally consumed */
951 goto next;
952 }
953
954 /* Allocate MAD send WR tracking structure */
955 mad_send_wr = kmalloc(sizeof *mad_send_wr, GFP_ATOMIC);
956 if (!mad_send_wr) {
957 printk(KERN_ERR PFX "No memory for "
958 "ib_mad_send_wr_private\n");
959 ret = -ENOMEM;
960 goto error2;
961 }
fa619a77 962 memset(mad_send_wr, 0, sizeof *mad_send_wr);
1da177e4
LT		 963
964 mad_send_wr->send_wr = *send_wr;
965 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
966 memcpy(mad_send_wr->sg_list, send_wr->sg_list,
967 sizeof *send_wr->sg_list * send_wr->num_sge);
fa619a77 968 mad_send_wr->wr_id = send_wr->wr_id;
1da177e4 969 mad_send_wr->tid = send_wr->wr.ud.mad_hdr->tid;
d760ce8f 970 mad_send_wr->mad_agent_priv = mad_agent_priv;
1da177e4
LT		 971 /* Timeout will be updated after send completes */
972 mad_send_wr->timeout = msecs_to_jiffies(send_wr->wr.
973 ud.timeout_ms);
f75b7a52 974 mad_send_wr->retries = mad_send_wr->send_wr.wr.ud.retries;
1da177e4
LT		 975 /* One reference for each work request to QP + response */
976 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
977 mad_send_wr->status = IB_WC_SUCCESS;
978
979 /* Reference MAD agent until send completes */
980 atomic_inc(&mad_agent_priv->refcount);
981 spin_lock_irqsave(&mad_agent_priv->lock, flags);
982 list_add_tail(&mad_send_wr->agent_list,
983 &mad_agent_priv->send_list);
984 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
985
fa619a77
HR		 986 if (mad_agent_priv->agent.rmpp_version) {
987 ret = ib_send_rmpp_mad(mad_send_wr);
988 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
989 ret = ib_send_mad(mad_send_wr);
990 } else
991 ret = ib_send_mad(mad_send_wr);
992 if (ret < 0) {
1da177e4
LT		 993 /* Fail send request */
994 spin_lock_irqsave(&mad_agent_priv->lock, flags);
995 list_del(&mad_send_wr->agent_list);
996 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
997 atomic_dec(&mad_agent_priv->refcount);
998 goto error2;
999 }
1000next:
1001 send_wr = next_send_wr;
1002 }
1003 return 0;
1004
1005error2:
1006 *bad_send_wr = send_wr;
1007error1:
1008 return ret;
1009}
1010EXPORT_SYMBOL(ib_post_send_mad);
1011
1012/*
1013 * ib_free_recv_mad - Returns data buffers used to receive
1014 * a MAD to the access layer
1015 */
1016void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1017{
fa619a77 1018 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1da177e4
LT		 1019 struct ib_mad_private_header *mad_priv_hdr;
1020 struct ib_mad_private *priv;
fa619a77 1021 struct list_head free_list;
1da177e4 1022
fa619a77
HR		 1023 INIT_LIST_HEAD(&free_list);
1024 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1da177e4 1025
fa619a77
HR		 1026 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1027 &free_list, list) {
1028 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1029 recv_buf);
1da177e4
LT		 1030 mad_priv_hdr = container_of(mad_recv_wc,
1031 struct ib_mad_private_header,
1032 recv_wc);
1033 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1034 header);
fa619a77 1035 kmem_cache_free(ib_mad_cache, priv);
1da177e4 1036 }
1da177e4
LT		 1037}
1038EXPORT_SYMBOL(ib_free_recv_mad);
1039
1da177e4
LT		 1040struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1041 u8 rmpp_version,
1042 ib_mad_send_handler send_handler,
1043 ib_mad_recv_handler recv_handler,
1044 void *context)
1045{
1046 return ERR_PTR(-EINVAL); /* XXX: for now */
1047}
1048EXPORT_SYMBOL(ib_redirect_mad_qp);
1049
1050int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1051 struct ib_wc *wc)
1052{
1053 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1054 return 0;
1055}
1056EXPORT_SYMBOL(ib_process_mad_wc);
1057
1058static int method_in_use(struct ib_mad_mgmt_method_table **method,
1059 struct ib_mad_reg_req *mad_reg_req)
1060{
1061 int i;
1062
1063 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1064 i < IB_MGMT_MAX_METHODS;
1065 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1066 1+i)) {
1067 if ((*method)->agent[i]) {
1068 printk(KERN_ERR PFX "Method %d already in use\n", i);
1069 return -EINVAL;
1070 }
1071 }
1072 return 0;
1073}
1074
1075static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1076{
1077 /* Allocate management method table */
1078 *method = kmalloc(sizeof **method, GFP_ATOMIC);
1079 if (!*method) {
1080 printk(KERN_ERR PFX "No memory for "
1081 "ib_mad_mgmt_method_table\n");
1082 return -ENOMEM;
1083 }
1084 /* Clear management method table */
1085 memset(*method, 0, sizeof **method);
1086
1087 return 0;
1088}
1089
1090/*
1091 * Check to see if there are any methods still in use
1092 */
1093static int check_method_table(struct ib_mad_mgmt_method_table *method)
1094{
1095 int i;
1096
1097 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1098 if (method->agent[i])
1099 return 1;
1100 return 0;
1101}
1102
1103/*
1104 * Check to see if there are any method tables for this class still in use
1105 */
1106static int check_class_table(struct ib_mad_mgmt_class_table *class)
1107{
1108 int i;
1109
1110 for (i = 0; i < MAX_MGMT_CLASS; i++)
1111 if (class->method_table[i])
1112 return 1;
1113 return 0;
1114}
1115
1116static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1117{
1118 int i;
1119
1120 for (i = 0; i < MAX_MGMT_OUI; i++)
1121 if (vendor_class->method_table[i])
1122 return 1;
1123 return 0;
1124}
1125
1126static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1127 char *oui)
1128{
1129 int i;
1130
1131 for (i = 0; i < MAX_MGMT_OUI; i++)
1132 /* Is there matching OUI for this vendor class ? */
1133 if (!memcmp(vendor_class->oui[i], oui, 3))
1134 return i;
1135
1136 return -1;
1137}
1138
1139static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1140{
1141 int i;
1142
1143 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1144 if (vendor->vendor_class[i])
1145 return 1;
1146
1147 return 0;
1148}
1149
1150static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1151 struct ib_mad_agent_private *agent)
1152{
1153 int i;
1154
1155 /* Remove any methods for this mad agent */
1156 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1157 if (method->agent[i] == agent) {
1158 method->agent[i] = NULL;
1159 }
1160 }
1161}
1162
1163static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1164 struct ib_mad_agent_private *agent_priv,
1165 u8 mgmt_class)
1166{
1167 struct ib_mad_port_private *port_priv;
1168 struct ib_mad_mgmt_class_table **class;
1169 struct ib_mad_mgmt_method_table **method;
1170 int i, ret;
1171
1172 port_priv = agent_priv->qp_info->port_priv;
1173 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1174 if (!*class) {
1175 /* Allocate management class table for "new" class version */
1176 *class = kmalloc(sizeof **class, GFP_ATOMIC);
1177 if (!*class) {
1178 printk(KERN_ERR PFX "No memory for "
1179 "ib_mad_mgmt_class_table\n");
1180 ret = -ENOMEM;
1181 goto error1;
1182 }
1183 /* Clear management class table */
1184 memset(*class, 0, sizeof(**class));
1185 /* Allocate method table for this management class */
1186 method = &(*class)->method_table[mgmt_class];
1187 if ((ret = allocate_method_table(method)))
1188 goto error2;
1189 } else {
1190 method = &(*class)->method_table[mgmt_class];
1191 if (!*method) {
1192 /* Allocate method table for this management class */
1193 if ((ret = allocate_method_table(method)))
1194 goto error1;
1195 }
1196 }
1197
1198 /* Now, make sure methods are not already in use */
1199 if (method_in_use(method, mad_reg_req))
1200 goto error3;
1201
1202 /* Finally, add in methods being registered */
1203 for (i = find_first_bit(mad_reg_req->method_mask,
1204 IB_MGMT_MAX_METHODS);
1205 i < IB_MGMT_MAX_METHODS;
1206 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1207 1+i)) {
1208 (*method)->agent[i] = agent_priv;
1209 }
1210 return 0;
1211
1212error3:
1213 /* Remove any methods for this mad agent */
1214 remove_methods_mad_agent(*method, agent_priv);
1215 /* Now, check to see if there are any methods in use */
1216 if (!check_method_table(*method)) {
1217 /* If not, release management method table */
1218 kfree(*method);
1219 *method = NULL;
1220 }
1221 ret = -EINVAL;
1222 goto error1;
1223error2:
1224 kfree(*class);
1225 *class = NULL;
1226error1:
1227 return ret;
1228}
1229
1230static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1231 struct ib_mad_agent_private *agent_priv)
1232{
1233 struct ib_mad_port_private *port_priv;
1234 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1235 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1236 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1237 struct ib_mad_mgmt_method_table **method;
1238 int i, ret = -ENOMEM;
1239 u8 vclass;
1240
1241 /* "New" vendor (with OUI) class */
1242 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1243 port_priv = agent_priv->qp_info->port_priv;
1244 vendor_table = &port_priv->version[
1245 mad_reg_req->mgmt_class_version].vendor;
1246 if (!*vendor_table) {
1247 /* Allocate mgmt vendor class table for "new" class version */
1248 vendor = kmalloc(sizeof *vendor, GFP_ATOMIC);
1249 if (!vendor) {
1250 printk(KERN_ERR PFX "No memory for "
1251 "ib_mad_mgmt_vendor_class_table\n");
1252 goto error1;
1253 }
1254 /* Clear management vendor class table */
1255 memset(vendor, 0, sizeof(*vendor));
1256 *vendor_table = vendor;
1257 }
1258 if (!(*vendor_table)->vendor_class[vclass]) {
1259 /* Allocate table for this management vendor class */
1260 vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC);
1261 if (!vendor_class) {
1262 printk(KERN_ERR PFX "No memory for "
1263 "ib_mad_mgmt_vendor_class\n");
1264 goto error2;
1265 }
1266 memset(vendor_class, 0, sizeof(*vendor_class));
1267 (*vendor_table)->vendor_class[vclass] = vendor_class;
1268 }
1269 for (i = 0; i < MAX_MGMT_OUI; i++) {
1270 /* Is there matching OUI for this vendor class ? */
1271 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1272 mad_reg_req->oui, 3)) {
1273 method = &(*vendor_table)->vendor_class[
1274 vclass]->method_table[i];
1275 BUG_ON(!*method);
1276 goto check_in_use;
1277 }
1278 }
1279 for (i = 0; i < MAX_MGMT_OUI; i++) {
1280 /* OUI slot available ? */
1281 if (!is_vendor_oui((*vendor_table)->vendor_class[
1282 vclass]->oui[i])) {
1283 method = &(*vendor_table)->vendor_class[
1284 vclass]->method_table[i];
1285 BUG_ON(*method);
1286 /* Allocate method table for this OUI */
1287 if ((ret = allocate_method_table(method)))
1288 goto error3;
1289 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1290 mad_reg_req->oui, 3);
1291 goto check_in_use;
1292 }
1293 }
1294 printk(KERN_ERR PFX "All OUI slots in use\n");
1295 goto error3;
1296
1297check_in_use:
1298 /* Now, make sure methods are not already in use */
1299 if (method_in_use(method, mad_reg_req))
1300 goto error4;
1301
1302 /* Finally, add in methods being registered */
1303 for (i = find_first_bit(mad_reg_req->method_mask,
1304 IB_MGMT_MAX_METHODS);
1305 i < IB_MGMT_MAX_METHODS;
1306 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1307 1+i)) {
1308 (*method)->agent[i] = agent_priv;
1309 }
1310 return 0;
1311
1312error4:
1313 /* Remove any methods for this mad agent */
1314 remove_methods_mad_agent(*method, agent_priv);
1315 /* Now, check to see if there are any methods in use */
1316 if (!check_method_table(*method)) {
1317 /* If not, release management method table */
1318 kfree(*method);
1319 *method = NULL;
1320 }
1321 ret = -EINVAL;
1322error3:
1323 if (vendor_class) {
1324 (*vendor_table)->vendor_class[vclass] = NULL;
1325 kfree(vendor_class);
1326 }
1327error2:
1328 if (vendor) {
1329 *vendor_table = NULL;
1330 kfree(vendor);
1331 }
1332error1:
1333 return ret;
1334}
1335
1336static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1337{
1338 struct ib_mad_port_private *port_priv;
1339 struct ib_mad_mgmt_class_table *class;
1340 struct ib_mad_mgmt_method_table *method;
1341 struct ib_mad_mgmt_vendor_class_table *vendor;
1342 struct ib_mad_mgmt_vendor_class *vendor_class;
1343 int index;
1344 u8 mgmt_class;
1345
1346 /*
1347 * Was MAD registration request supplied
1348 * with original registration ?
1349 */
1350 if (!agent_priv->reg_req) {
1351 goto out;
1352 }
1353
1354 port_priv = agent_priv->qp_info->port_priv;
1355 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1356 class = port_priv->version[
1357 agent_priv->reg_req->mgmt_class_version].class;
1358 if (!class)
1359 goto vendor_check;
1360
1361 method = class->method_table[mgmt_class];
1362 if (method) {
1363 /* Remove any methods for this mad agent */
1364 remove_methods_mad_agent(method, agent_priv);
1365 /* Now, check to see if there are any methods still in use */
1366 if (!check_method_table(method)) {
1367 /* If not, release management method table */
1368 kfree(method);
1369 class->method_table[mgmt_class] = NULL;
1370 /* Any management classes left ? */
1371 if (!check_class_table(class)) {
1372 /* If not, release management class table */
1373 kfree(class);
1374 port_priv->version[
1375 agent_priv->reg_req->
1376 mgmt_class_version].class = NULL;
1377 }
1378 }
1379 }
1380
1381vendor_check:
1382 if (!is_vendor_class(mgmt_class))
1383 goto out;
1384
1385 /* normalize mgmt_class to vendor range 2 */
1386 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1387 vendor = port_priv->version[
1388 agent_priv->reg_req->mgmt_class_version].vendor;
1389
1390 if (!vendor)
1391 goto out;
1392
1393 vendor_class = vendor->vendor_class[mgmt_class];
1394 if (vendor_class) {
1395 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1396 if (index < 0)
1397 goto out;
1398 method = vendor_class->method_table[index];
1399 if (method) {
1400 /* Remove any methods for this mad agent */
1401 remove_methods_mad_agent(method, agent_priv);
1402 /*
1403 * Now, check to see if there are
1404 * any methods still in use
1405 */
1406 if (!check_method_table(method)) {
1407 /* If not, release management method table */
1408 kfree(method);
1409 vendor_class->method_table[index] = NULL;
1410 memset(vendor_class->oui[index], 0, 3);
1411 /* Any OUIs left ? */
1412 if (!check_vendor_class(vendor_class)) {
1413 /* If not, release vendor class table */
1414 kfree(vendor_class);
1415 vendor->vendor_class[mgmt_class] = NULL;
1416 /* Any other vendor classes left ? */
1417 if (!check_vendor_table(vendor)) {
1418 kfree(vendor);
1419 port_priv->version[
1420 agent_priv->reg_req->
1421 mgmt_class_version].
1422 vendor = NULL;
1423 }
1424 }
1425 }
1426 }
1427 }
1428
1429out:
1430 return;
1431}
1432
1da177e4
LT		 1433static struct ib_mad_agent_private *
1434find_mad_agent(struct ib_mad_port_private *port_priv,
4a0754fa 1435 struct ib_mad *mad)
1da177e4
LT		 1436{
1437 struct ib_mad_agent_private *mad_agent = NULL;
1438 unsigned long flags;
1439
1440 spin_lock_irqsave(&port_priv->reg_lock, flags);
4a0754fa 1441 if (response_mad(mad)) {
1da177e4
LT		 1442 u32 hi_tid;
1443 struct ib_mad_agent_private *entry;
1444
1445 /*
1446 * Routing is based on high 32 bits of transaction ID
1447 * of MAD.
1448 */
1449 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1450 list_for_each_entry(entry, &port_priv->agent_list,
1451 agent_list) {
1452 if (entry->agent.hi_tid == hi_tid) {
1453 mad_agent = entry;
1454 break;
1455 }
1456 }
1457 } else {
1458 struct ib_mad_mgmt_class_table *class;
1459 struct ib_mad_mgmt_method_table *method;
1460 struct ib_mad_mgmt_vendor_class_table *vendor;
1461 struct ib_mad_mgmt_vendor_class *vendor_class;
1462 struct ib_vendor_mad *vendor_mad;
1463 int index;
1464
1465 /*
1466 * Routing is based on version, class, and method
1467 * For "newer" vendor MADs, also based on OUI
1468 */
1469 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1470 goto out;
1471 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1472 class = port_priv->version[
1473 mad->mad_hdr.class_version].class;
1474 if (!class)
1475 goto out;
1476 method = class->method_table[convert_mgmt_class(
1477 mad->mad_hdr.mgmt_class)];
1478 if (method)
1479 mad_agent = method->agent[mad->mad_hdr.method &
1480 ~IB_MGMT_METHOD_RESP];
1481 } else {
1482 vendor = port_priv->version[
1483 mad->mad_hdr.class_version].vendor;
1484 if (!vendor)
1485 goto out;
1486 vendor_class = vendor->vendor_class[vendor_class_index(
1487 mad->mad_hdr.mgmt_class)];
1488 if (!vendor_class)
1489 goto out;
1490 /* Find matching OUI */
1491 vendor_mad = (struct ib_vendor_mad *)mad;
1492 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1493 if (index == -1)
1494 goto out;
1495 method = vendor_class->method_table[index];
1496 if (method) {
1497 mad_agent = method->agent[mad->mad_hdr.method &
1498 ~IB_MGMT_METHOD_RESP];
1499 }
1500 }
1501 }
1502
1503 if (mad_agent) {
1504 if (mad_agent->agent.recv_handler)
1505 atomic_inc(&mad_agent->refcount);
1506 else {
1507 printk(KERN_NOTICE PFX "No receive handler for client "
1508 "%p on port %d\n",
1509 &mad_agent->agent, port_priv->port_num);
1510 mad_agent = NULL;
1511 }
1512 }
1513out:
1514 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1515
1516 return mad_agent;
1517}
1518
1519static int validate_mad(struct ib_mad *mad, u32 qp_num)
1520{
1521 int valid = 0;
1522
1523 /* Make sure MAD base version is understood */
1524 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1525 printk(KERN_ERR PFX "MAD received with unsupported base "
1526 "version %d\n", mad->mad_hdr.base_version);
1527 goto out;
1528 }
1529
1530 /* Filter SMI packets sent to other than QP0 */
1531 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1532 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1533 if (qp_num == 0)
1534 valid = 1;
1535 } else {
1536 /* Filter GSI packets sent to QP0 */
1537 if (qp_num != 0)
1538 valid = 1;
1539 }
1540
1541out:
1542 return valid;
1543}
1544
fa619a77
HR		 1545static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1546 struct ib_mad_hdr *mad_hdr)
1547{
1548 struct ib_rmpp_mad *rmpp_mad;
1549
1550 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1551 return !mad_agent_priv->agent.rmpp_version ||
1552 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1553 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1554 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1555}
1556
1557struct ib_mad_send_wr_private*
97f52eb4 1558ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, __be64 tid)
1da177e4
LT		 1559{
1560 struct ib_mad_send_wr_private *mad_send_wr;
1561
1562 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1563 agent_list) {
1564 if (mad_send_wr->tid == tid)
1565 return mad_send_wr;
1566 }
1567
1568 /*
1569 * It's possible to receive the response before we've
1570 * been notified that the send has completed
1571 */
1572 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1573 agent_list) {
fa619a77
HR		 1574 if (is_data_mad(mad_agent_priv,
1575 mad_send_wr->send_wr.wr.ud.mad_hdr) &&
1576 mad_send_wr->tid == tid && mad_send_wr->timeout) {
1da177e4
LT		 1577 /* Verify request has not been canceled */
1578 return (mad_send_wr->status == IB_WC_SUCCESS) ?
1579 mad_send_wr : NULL;
1580 }
1581 }
1582 return NULL;
1583}
1584
fa619a77 1585void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
6a0c435e
HR		 1586{
1587 mad_send_wr->timeout = 0;
1588 if (mad_send_wr->refcount == 1) {
1589 list_del(&mad_send_wr->agent_list);
1590 list_add_tail(&mad_send_wr->agent_list,
1591 &mad_send_wr->mad_agent_priv->done_list);
1592 }
1593}
1594
1da177e4 1595static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
4a0754fa 1596 struct ib_mad_recv_wc *mad_recv_wc)
1da177e4
LT		 1597{
1598 struct ib_mad_send_wr_private *mad_send_wr;
1599 struct ib_mad_send_wc mad_send_wc;
1600 unsigned long flags;
97f52eb4 1601 __be64 tid;
1da177e4 1602
fa619a77
HR		 1603 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1604 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1605 if (mad_agent_priv->agent.rmpp_version) {
1606 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1607 mad_recv_wc);
1608 if (!mad_recv_wc) {
1609 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1610 wake_up(&mad_agent_priv->wait);
1611 return;
1612 }
1613 }
1614
1da177e4 1615 /* Complete corresponding request */
4a0754fa
HR		 1616 if (response_mad(mad_recv_wc->recv_buf.mad)) {
1617 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1da177e4 1618 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa619a77 1619 mad_send_wr = ib_find_send_mad(mad_agent_priv, tid);
1da177e4
LT		 1620 if (!mad_send_wr) {
1621 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
4a0754fa 1622 ib_free_recv_mad(mad_recv_wc);
1da177e4
LT		 1623 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1624 wake_up(&mad_agent_priv->wait);
1625 return;
1626 }
fa619a77 1627 ib_mark_mad_done(mad_send_wr);
1da177e4
LT		 1628 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1629
1630 /* Defined behavior is to complete response before request */
4a0754fa
HR		 1631 mad_recv_wc->wc->wr_id = mad_send_wr->wr_id;
1632 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1633 mad_recv_wc);
1da177e4
LT		 1634 atomic_dec(&mad_agent_priv->refcount);
1635
1636 mad_send_wc.status = IB_WC_SUCCESS;
1637 mad_send_wc.vendor_err = 0;
1638 mad_send_wc.wr_id = mad_send_wr->wr_id;
1639 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1640 } else {
4a0754fa
HR		 1641 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1642 mad_recv_wc);
1da177e4
LT		 1643 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1644 wake_up(&mad_agent_priv->wait);
1645 }
1646}
1647
1648static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1649 struct ib_wc *wc)
1650{
1651 struct ib_mad_qp_info *qp_info;
1652 struct ib_mad_private_header *mad_priv_hdr;
1653 struct ib_mad_private *recv, *response;
1654 struct ib_mad_list_head *mad_list;
1655 struct ib_mad_agent_private *mad_agent;
1da177e4
LT		 1656
1657 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1658 if (!response)
1659 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1660 "for response buffer\n");
1661
1662 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1663 qp_info = mad_list->mad_queue->qp_info;
1664 dequeue_mad(mad_list);
1665
1666 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1667 mad_list);
1668 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1669 dma_unmap_single(port_priv->device->dma_device,
1670 pci_unmap_addr(&recv->header, mapping),
1671 sizeof(struct ib_mad_private) -
1672 sizeof(struct ib_mad_private_header),
1673 DMA_FROM_DEVICE);
1674
1675 /* Setup MAD receive work completion from "normal" work completion */
24239aff
SH		 1676 recv->header.wc = *wc;
1677 recv->header.recv_wc.wc = &recv->header.wc;
1da177e4
LT		 1678 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1679 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1680 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1681
1682 if (atomic_read(&qp_info->snoop_count))
1683 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1684
1685 /* Validate MAD */
1686 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1687 goto out;
1688
1689 if (recv->mad.mad.mad_hdr.mgmt_class ==
1690 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1691 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1692 port_priv->device->node_type,
1693 port_priv->port_num,
1694 port_priv->device->phys_port_cnt))
1695 goto out;
1696 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1697 goto local;
1698 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1699 port_priv->device->node_type,
1700 port_priv->port_num))
1701 goto out;
1702 if (!smi_check_local_dr_smp(&recv->mad.smp,
1703 port_priv->device,
1704 port_priv->port_num))
1705 goto out;
1706 }
1707
1708local:
1709 /* Give driver "right of first refusal" on incoming MAD */
1710 if (port_priv->device->process_mad) {
1711 int ret;
1712
1713 if (!response) {
1714 printk(KERN_ERR PFX "No memory for response MAD\n");
1715 /*
1716 * Is it better to assume that
1717 * it wouldn't be processed ?
1718 */
1719 goto out;
1720 }
1721
1722 ret = port_priv->device->process_mad(port_priv->device, 0,
1723 port_priv->port_num,
1724 wc, &recv->grh,
1725 &recv->mad.mad,
1726 &response->mad.mad);
1727 if (ret & IB_MAD_RESULT_SUCCESS) {
1728 if (ret & IB_MAD_RESULT_CONSUMED)
1729 goto out;
1730 if (ret & IB_MAD_RESULT_REPLY) {
1731 /* Send response */
1732 if (!agent_send(response, &recv->grh, wc,
1733 port_priv->device,
1734 port_priv->port_num))
1735 response = NULL;
1736 goto out;
1737 }
1738 }
1739 }
1740
4a0754fa 1741 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1da177e4 1742 if (mad_agent) {
4a0754fa 1743 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1da177e4
LT		 1744 /*
1745 * recv is freed up in error cases in ib_mad_complete_recv
1746 * or via recv_handler in ib_mad_complete_recv()
1747 */
1748 recv = NULL;
1749 }
1750
1751out:
1752 /* Post another receive request for this QP */
1753 if (response) {
1754 ib_mad_post_receive_mads(qp_info, response);
1755 if (recv)
1756 kmem_cache_free(ib_mad_cache, recv);
1757 } else
1758 ib_mad_post_receive_mads(qp_info, recv);
1759}
1760
1761static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1762{
1763 struct ib_mad_send_wr_private *mad_send_wr;
1764 unsigned long delay;
1765
1766 if (list_empty(&mad_agent_priv->wait_list)) {
1767 cancel_delayed_work(&mad_agent_priv->timed_work);
1768 } else {
1769 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1770 struct ib_mad_send_wr_private,
1771 agent_list);
1772
1773 if (time_after(mad_agent_priv->timeout,
1774 mad_send_wr->timeout)) {
1775 mad_agent_priv->timeout = mad_send_wr->timeout;
1776 cancel_delayed_work(&mad_agent_priv->timed_work);
1777 delay = mad_send_wr->timeout - jiffies;
1778 if ((long)delay <= 0)
1779 delay = 1;
1780 queue_delayed_work(mad_agent_priv->qp_info->
1781 port_priv->wq,
1782 &mad_agent_priv->timed_work, delay);
1783 }
1784 }
1785}
1786
d760ce8f 1787static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4 1788{
d760ce8f 1789 struct ib_mad_agent_private *mad_agent_priv;
1da177e4
LT		 1790 struct ib_mad_send_wr_private *temp_mad_send_wr;
1791 struct list_head *list_item;
1792 unsigned long delay;
1793
d760ce8f 1794 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4
LT		 1795 list_del(&mad_send_wr->agent_list);
1796
1797 delay = mad_send_wr->timeout;
1798 mad_send_wr->timeout += jiffies;
1799
29bb33dd
HR		 1800 if (delay) {
1801 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1802 temp_mad_send_wr = list_entry(list_item,
1803 struct ib_mad_send_wr_private,
1804 agent_list);
1805 if (time_after(mad_send_wr->timeout,
1806 temp_mad_send_wr->timeout))
1807 break;
1808 }
1da177e4 1809 }
29bb33dd
HR		 1810 else
1811 list_item = &mad_agent_priv->wait_list;
1da177e4
LT		 1812 list_add(&mad_send_wr->agent_list, list_item);
1813
1814 /* Reschedule a work item if we have a shorter timeout */
1815 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1816 cancel_delayed_work(&mad_agent_priv->timed_work);
1817 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1818 &mad_agent_priv->timed_work, delay);
1819 }
1820}
1821
03b61ad2
HR		 1822void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1823 int timeout_ms)
1824{
1825 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1826 wait_for_response(mad_send_wr);
1827}
1828
1da177e4
LT		 1829/*
1830 * Process a send work completion
1831 */
fa619a77
HR		 1832void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1833 struct ib_mad_send_wc *mad_send_wc)
1da177e4
LT		 1834{
1835 struct ib_mad_agent_private *mad_agent_priv;
1836 unsigned long flags;
fa619a77 1837 int ret;
1da177e4 1838
d760ce8f 1839 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4 1840 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa619a77
HR		 1841 if (mad_agent_priv->agent.rmpp_version) {
1842 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1843 if (ret == IB_RMPP_RESULT_CONSUMED)
1844 goto done;
1845 } else
1846 ret = IB_RMPP_RESULT_UNHANDLED;
1847
1da177e4
LT		 1848 if (mad_send_wc->status != IB_WC_SUCCESS &&
1849 mad_send_wr->status == IB_WC_SUCCESS) {
1850 mad_send_wr->status = mad_send_wc->status;
1851 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1852 }
1853
1854 if (--mad_send_wr->refcount > 0) {
1855 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1856 mad_send_wr->status == IB_WC_SUCCESS) {
d760ce8f 1857 wait_for_response(mad_send_wr);
1da177e4 1858 }
fa619a77 1859 goto done;
1da177e4
LT		 1860 }
1861
1862 /* Remove send from MAD agent and notify client of completion */
1863 list_del(&mad_send_wr->agent_list);
1864 adjust_timeout(mad_agent_priv);
1865 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1866
1867 if (mad_send_wr->status != IB_WC_SUCCESS )
1868 mad_send_wc->status = mad_send_wr->status;
fa619a77
HR		 1869 if (ret != IB_RMPP_RESULT_INTERNAL)
1870 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1871 mad_send_wc);
1da177e4
LT		 1872
1873 /* Release reference on agent taken when sending */
1874 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1875 wake_up(&mad_agent_priv->wait);
1876
1877 kfree(mad_send_wr);
fa619a77
HR		 1878 return;
1879done:
1880 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1da177e4
LT		 1881}
1882
1883static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1884 struct ib_wc *wc)
1885{
1886 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
1887 struct ib_mad_list_head *mad_list;
1888 struct ib_mad_qp_info *qp_info;
1889 struct ib_mad_queue *send_queue;
1890 struct ib_send_wr *bad_send_wr;
1891 unsigned long flags;
1892 int ret;
1893
1894 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1895 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1896 mad_list);
1897 send_queue = mad_list->mad_queue;
1898 qp_info = send_queue->qp_info;
1899
1900retry:
1901 queued_send_wr = NULL;
1902 spin_lock_irqsave(&send_queue->lock, flags);
1903 list_del(&mad_list->list);
1904
1905 /* Move queued send to the send queue */
1906 if (send_queue->count-- > send_queue->max_active) {
1907 mad_list = container_of(qp_info->overflow_list.next,
1908 struct ib_mad_list_head, list);
1909 queued_send_wr = container_of(mad_list,
1910 struct ib_mad_send_wr_private,
1911 mad_list);
1912 list_del(&mad_list->list);
1913 list_add_tail(&mad_list->list, &send_queue->list);
1914 }
1915 spin_unlock_irqrestore(&send_queue->lock, flags);
1916
1917 /* Restore client wr_id in WC and complete send */
1918 wc->wr_id = mad_send_wr->wr_id;
1919 if (atomic_read(&qp_info->snoop_count))
1920 snoop_send(qp_info, &mad_send_wr->send_wr,
1921 (struct ib_mad_send_wc *)wc,
1922 IB_MAD_SNOOP_SEND_COMPLETIONS);
1923 ib_mad_complete_send_wr(mad_send_wr, (struct ib_mad_send_wc *)wc);
1924
1925 if (queued_send_wr) {
1926 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1927 &bad_send_wr);
1928 if (ret) {
1929 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1930 mad_send_wr = queued_send_wr;
1931 wc->status = IB_WC_LOC_QP_OP_ERR;
1932 goto retry;
1933 }
1934 }
1935}
1936
1937static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1938{
1939 struct ib_mad_send_wr_private *mad_send_wr;
1940 struct ib_mad_list_head *mad_list;
1941 unsigned long flags;
1942
1943 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1944 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1945 mad_send_wr = container_of(mad_list,
1946 struct ib_mad_send_wr_private,
1947 mad_list);
1948 mad_send_wr->retry = 1;
1949 }
1950 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1951}
1952
1953static void mad_error_handler(struct ib_mad_port_private *port_priv,
1954 struct ib_wc *wc)
1955{
1956 struct ib_mad_list_head *mad_list;
1957 struct ib_mad_qp_info *qp_info;
1958 struct ib_mad_send_wr_private *mad_send_wr;
1959 int ret;
1960
1961 /* Determine if failure was a send or receive */
1962 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1963 qp_info = mad_list->mad_queue->qp_info;
1964 if (mad_list->mad_queue == &qp_info->recv_queue)
1965 /*
1966 * Receive errors indicate that the QP has entered the error
1967 * state - error handling/shutdown code will cleanup
1968 */
1969 return;
1970
1971 /*
1972 * Send errors will transition the QP to SQE - move
1973 * QP to RTS and repost flushed work requests
1974 */
1975 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1976 mad_list);
1977 if (wc->status == IB_WC_WR_FLUSH_ERR) {
1978 if (mad_send_wr->retry) {
1979 /* Repost send */
1980 struct ib_send_wr *bad_send_wr;
1981
1982 mad_send_wr->retry = 0;
1983 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1984 &bad_send_wr);
1985 if (ret)
1986 ib_mad_send_done_handler(port_priv, wc);
1987 } else
1988 ib_mad_send_done_handler(port_priv, wc);
1989 } else {
1990 struct ib_qp_attr *attr;
1991
1992 /* Transition QP to RTS and fail offending send */
1993 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1994 if (attr) {
1995 attr->qp_state = IB_QPS_RTS;
1996 attr->cur_qp_state = IB_QPS_SQE;
1997 ret = ib_modify_qp(qp_info->qp, attr,
1998 IB_QP_STATE | IB_QP_CUR_STATE);
1999 kfree(attr);
2000 if (ret)
2001 printk(KERN_ERR PFX "mad_error_handler - "
2002 "ib_modify_qp to RTS : %d\n", ret);
2003 else
2004 mark_sends_for_retry(qp_info);
2005 }
2006 ib_mad_send_done_handler(port_priv, wc);
2007 }
2008}
2009
2010/*
2011 * IB MAD completion callback
2012 */
2013static void ib_mad_completion_handler(void *data)
2014{
2015 struct ib_mad_port_private *port_priv;
2016 struct ib_wc wc;
2017
2018 port_priv = (struct ib_mad_port_private *)data;
2019 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2020
2021 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2022 if (wc.status == IB_WC_SUCCESS) {
2023 switch (wc.opcode) {
2024 case IB_WC_SEND:
2025 ib_mad_send_done_handler(port_priv, &wc);
2026 break;
2027 case IB_WC_RECV:
2028 ib_mad_recv_done_handler(port_priv, &wc);
2029 break;
2030 default:
2031 BUG_ON(1);
2032 break;
2033 }
2034 } else
2035 mad_error_handler(port_priv, &wc);
2036 }
2037}
2038
2039static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2040{
2041 unsigned long flags;
2042 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2043 struct ib_mad_send_wc mad_send_wc;
2044 struct list_head cancel_list;
2045
2046 INIT_LIST_HEAD(&cancel_list);
2047
2048 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2049 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2050 &mad_agent_priv->send_list, agent_list) {
2051 if (mad_send_wr->status == IB_WC_SUCCESS) {
2052 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2053 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2054 }
2055 }
2056
2057 /* Empty wait list to prevent receives from finding a request */
2058 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2c153b93
HR		 2059 /* Empty local completion list as well */
2060 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
1da177e4
LT		 2061 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2062
2063 /* Report all cancelled requests */
2064 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2065 mad_send_wc.vendor_err = 0;
2066
2067 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2068 &cancel_list, agent_list) {
2069 mad_send_wc.wr_id = mad_send_wr->wr_id;
2070 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2071 &mad_send_wc);
2072
2073 list_del(&mad_send_wr->agent_list);
2074 kfree(mad_send_wr);
2075 atomic_dec(&mad_agent_priv->refcount);
2076 }
2077}
2078
2079static struct ib_mad_send_wr_private*
cabe3cbc 2080find_send_by_wr_id(struct ib_mad_agent_private *mad_agent_priv, u64 wr_id)
1da177e4
LT		 2081{
2082 struct ib_mad_send_wr_private *mad_send_wr;
2083
2084 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2085 agent_list) {
2086 if (mad_send_wr->wr_id == wr_id)
2087 return mad_send_wr;
2088 }
2089
2090 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2091 agent_list) {
fa619a77
HR		 2092 if (is_data_mad(mad_agent_priv,
2093 mad_send_wr->send_wr.wr.ud.mad_hdr) &&
2094 mad_send_wr->wr_id == wr_id)
1da177e4
LT		 2095 return mad_send_wr;
2096 }
2097 return NULL;
2098}
2099
03b61ad2 2100int ib_modify_mad(struct ib_mad_agent *mad_agent, u64 wr_id, u32 timeout_ms)
1da177e4
LT		 2101{
2102 struct ib_mad_agent_private *mad_agent_priv;
2103 struct ib_mad_send_wr_private *mad_send_wr;
2104 unsigned long flags;
cabe3cbc 2105 int active;
1da177e4
LT		 2106
2107 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2108 agent);
2109 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2110 mad_send_wr = find_send_by_wr_id(mad_agent_priv, wr_id);
03b61ad2 2111 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
1da177e4 2112 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2 2113 return -EINVAL;
1da177e4
LT		 2114 }
2115
cabe3cbc 2116 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
03b61ad2 2117 if (!timeout_ms) {
1da177e4 2118 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
03b61ad2 2119 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1da177e4
LT		 2120 }
2121
03b61ad2 2122 mad_send_wr->send_wr.wr.ud.timeout_ms = timeout_ms;
cabe3cbc 2123 if (active)
03b61ad2
HR		 2124 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2125 else
2126 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2127
1da177e4 2128 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2
HR		 2129 return 0;
2130}
2131EXPORT_SYMBOL(ib_modify_mad);
1da177e4 2132
03b61ad2
HR		 2133void ib_cancel_mad(struct ib_mad_agent *mad_agent, u64 wr_id)
2134{
2135 ib_modify_mad(mad_agent, wr_id, 0);
1da177e4
LT		 2136}
2137EXPORT_SYMBOL(ib_cancel_mad);
2138
2139static void local_completions(void *data)
2140{
2141 struct ib_mad_agent_private *mad_agent_priv;
2142 struct ib_mad_local_private *local;
2143 struct ib_mad_agent_private *recv_mad_agent;
2144 unsigned long flags;
2c153b93 2145 int recv = 0;
1da177e4
LT		 2146 struct ib_wc wc;
2147 struct ib_mad_send_wc mad_send_wc;
2148
2149 mad_agent_priv = (struct ib_mad_agent_private *)data;
2150
2151 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2152 while (!list_empty(&mad_agent_priv->local_list)) {
2153 local = list_entry(mad_agent_priv->local_list.next,
2154 struct ib_mad_local_private,
2155 completion_list);
2156 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2157 if (local->mad_priv) {
2158 recv_mad_agent = local->recv_mad_agent;
2159 if (!recv_mad_agent) {
2160 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
1da177e4
LT		 2161 goto local_send_completion;
2162 }
2163
2c153b93 2164 recv = 1;
1da177e4
LT		 2165 /*
2166 * Defined behavior is to complete response
2167 * before request
2168 */
97f52eb4
SH		 2169 build_smp_wc(local->wr_id,
2170 be16_to_cpu(IB_LID_PERMISSIVE),
1da177e4
LT		 2171 0 /* pkey index */,
2172 recv_mad_agent->agent.port_num, &wc);
2173
2174 local->mad_priv->header.recv_wc.wc = &wc;
2175 local->mad_priv->header.recv_wc.mad_len =
2176 sizeof(struct ib_mad);
fa619a77
HR		 2177 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2178 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2179 &local->mad_priv->header.recv_wc.rmpp_list);
1da177e4
LT		 2180 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2181 local->mad_priv->header.recv_wc.recv_buf.mad =
2182 &local->mad_priv->mad.mad;
2183 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2184 snoop_recv(recv_mad_agent->qp_info,
2185 &local->mad_priv->header.recv_wc,
2186 IB_MAD_SNOOP_RECVS);
2187 recv_mad_agent->agent.recv_handler(
2188 &recv_mad_agent->agent,
2189 &local->mad_priv->header.recv_wc);
2190 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2191 atomic_dec(&recv_mad_agent->refcount);
2192 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2193 }
2194
2195local_send_completion:
2196 /* Complete send */
2197 mad_send_wc.status = IB_WC_SUCCESS;
2198 mad_send_wc.vendor_err = 0;
2199 mad_send_wc.wr_id = local->wr_id;
2200 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2201 snoop_send(mad_agent_priv->qp_info, &local->send_wr,
2202 &mad_send_wc,
2203 IB_MAD_SNOOP_SEND_COMPLETIONS);
2204 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2205 &mad_send_wc);
2206
2207 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2208 list_del(&local->completion_list);
2209 atomic_dec(&mad_agent_priv->refcount);
2c153b93
HR		 2210 if (!recv)
2211 kmem_cache_free(ib_mad_cache, local->mad_priv);
1da177e4
LT		 2212 kfree(local);
2213 }
2214 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2215}
2216
f75b7a52
HR		 2217static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2218{
2219 int ret;
2220
2221 if (!mad_send_wr->retries--)
2222 return -ETIMEDOUT;
2223
2224 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_wr.
2225 wr.ud.timeout_ms);
2226
fa619a77
HR		 2227 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2228 ret = ib_retry_rmpp(mad_send_wr);
2229 switch (ret) {
2230 case IB_RMPP_RESULT_UNHANDLED:
2231 ret = ib_send_mad(mad_send_wr);
2232 break;
2233 case IB_RMPP_RESULT_CONSUMED:
2234 ret = 0;
2235 break;
2236 default:
2237 ret = -ECOMM;
2238 break;
2239 }
2240 } else
2241 ret = ib_send_mad(mad_send_wr);
f75b7a52
HR		 2242
2243 if (!ret) {
2244 mad_send_wr->refcount++;
f75b7a52
HR		 2245 list_add_tail(&mad_send_wr->agent_list,
2246 &mad_send_wr->mad_agent_priv->send_list);
2247 }
2248 return ret;
2249}
2250
1da177e4
LT		 2251static void timeout_sends(void *data)
2252{
2253 struct ib_mad_agent_private *mad_agent_priv;
2254 struct ib_mad_send_wr_private *mad_send_wr;
2255 struct ib_mad_send_wc mad_send_wc;
2256 unsigned long flags, delay;
2257
2258 mad_agent_priv = (struct ib_mad_agent_private *)data;
1da177e4
LT		 2259 mad_send_wc.vendor_err = 0;
2260
2261 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2262 while (!list_empty(&mad_agent_priv->wait_list)) {
2263 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2264 struct ib_mad_send_wr_private,
2265 agent_list);
2266
2267 if (time_after(mad_send_wr->timeout, jiffies)) {
2268 delay = mad_send_wr->timeout - jiffies;
2269 if ((long)delay <= 0)
2270 delay = 1;
2271 queue_delayed_work(mad_agent_priv->qp_info->
2272 port_priv->wq,
2273 &mad_agent_priv->timed_work, delay);
2274 break;
2275 }
2276
dbf9227b 2277 list_del(&mad_send_wr->agent_list);
29bb33dd
HR		 2278 if (mad_send_wr->status == IB_WC_SUCCESS &&
2279 !retry_send(mad_send_wr))
f75b7a52
HR		 2280 continue;
2281
1da177e4
LT		 2282 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2283
03b61ad2
HR		 2284 if (mad_send_wr->status == IB_WC_SUCCESS)
2285 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2286 else
2287 mad_send_wc.status = mad_send_wr->status;
1da177e4
LT		 2288 mad_send_wc.wr_id = mad_send_wr->wr_id;
2289 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2290 &mad_send_wc);
2291
2292 kfree(mad_send_wr);
2293 atomic_dec(&mad_agent_priv->refcount);
2294 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2295 }
2296 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2297}
2298
5dd2ce12 2299static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
1da177e4
LT		 2300{
2301 struct ib_mad_port_private *port_priv = cq->cq_context;
2302
2303 queue_work(port_priv->wq, &port_priv->work);
2304}
2305
2306/*
2307 * Allocate receive MADs and post receive WRs for them
2308 */
2309static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2310 struct ib_mad_private *mad)
2311{
2312 unsigned long flags;
2313 int post, ret;
2314 struct ib_mad_private *mad_priv;
2315 struct ib_sge sg_list;
2316 struct ib_recv_wr recv_wr, *bad_recv_wr;
2317 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2318
2319 /* Initialize common scatter list fields */
2320 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2321 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2322
2323 /* Initialize common receive WR fields */
2324 recv_wr.next = NULL;
2325 recv_wr.sg_list = &sg_list;
2326 recv_wr.num_sge = 1;
2327
2328 do {
2329 /* Allocate and map receive buffer */
2330 if (mad) {
2331 mad_priv = mad;
2332 mad = NULL;
2333 } else {
2334 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2335 if (!mad_priv) {
2336 printk(KERN_ERR PFX "No memory for receive buffer\n");
2337 ret = -ENOMEM;
2338 break;
2339 }
2340 }
2341 sg_list.addr = dma_map_single(qp_info->port_priv->
2342 device->dma_device,
2343 &mad_priv->grh,
2344 sizeof *mad_priv -
2345 sizeof mad_priv->header,
2346 DMA_FROM_DEVICE);
2347 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2348 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2349 mad_priv->header.mad_list.mad_queue = recv_queue;
2350
2351 /* Post receive WR */
2352 spin_lock_irqsave(&recv_queue->lock, flags);
2353 post = (++recv_queue->count < recv_queue->max_active);
2354 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2355 spin_unlock_irqrestore(&recv_queue->lock, flags);
2356 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2357 if (ret) {
2358 spin_lock_irqsave(&recv_queue->lock, flags);
2359 list_del(&mad_priv->header.mad_list.list);
2360 recv_queue->count--;
2361 spin_unlock_irqrestore(&recv_queue->lock, flags);
2362 dma_unmap_single(qp_info->port_priv->device->dma_device,
2363 pci_unmap_addr(&mad_priv->header,
2364 mapping),
2365 sizeof *mad_priv -
2366 sizeof mad_priv->header,
2367 DMA_FROM_DEVICE);
2368 kmem_cache_free(ib_mad_cache, mad_priv);
2369 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2370 break;
2371 }
2372 } while (post);
2373
2374 return ret;
2375}
2376
2377/*
2378 * Return all the posted receive MADs
2379 */
2380static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2381{
2382 struct ib_mad_private_header *mad_priv_hdr;
2383 struct ib_mad_private *recv;
2384 struct ib_mad_list_head *mad_list;
2385
2386 while (!list_empty(&qp_info->recv_queue.list)) {
2387
2388 mad_list = list_entry(qp_info->recv_queue.list.next,
2389 struct ib_mad_list_head, list);
2390 mad_priv_hdr = container_of(mad_list,
2391 struct ib_mad_private_header,
2392 mad_list);
2393 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2394 header);
2395
2396 /* Remove from posted receive MAD list */
2397 list_del(&mad_list->list);
2398
1da177e4
LT		 2399 dma_unmap_single(qp_info->port_priv->device->dma_device,
2400 pci_unmap_addr(&recv->header, mapping),
2401 sizeof(struct ib_mad_private) -
2402 sizeof(struct ib_mad_private_header),
2403 DMA_FROM_DEVICE);
2404 kmem_cache_free(ib_mad_cache, recv);
2405 }
2406
2407 qp_info->recv_queue.count = 0;
2408}
2409
2410/*
2411 * Start the port
2412 */
2413static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2414{
2415 int ret, i;
2416 struct ib_qp_attr *attr;
2417 struct ib_qp *qp;
2418
2419 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2420 if (!attr) {
2421 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2422 return -ENOMEM;
2423 }
2424
2425 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2426 qp = port_priv->qp_info[i].qp;
2427 /*
2428 * PKey index for QP1 is irrelevant but
2429 * one is needed for the Reset to Init transition
2430 */
2431 attr->qp_state = IB_QPS_INIT;
2432 attr->pkey_index = 0;
2433 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2434 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2435 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2436 if (ret) {
2437 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2438 "INIT: %d\n", i, ret);
2439 goto out;
2440 }
2441
2442 attr->qp_state = IB_QPS_RTR;
2443 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2444 if (ret) {
2445 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2446 "RTR: %d\n", i, ret);
2447 goto out;
2448 }
2449
2450 attr->qp_state = IB_QPS_RTS;
2451 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2452 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2453 if (ret) {
2454 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2455 "RTS: %d\n", i, ret);
2456 goto out;
2457 }
2458 }
2459
2460 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2461 if (ret) {
2462 printk(KERN_ERR PFX "Failed to request completion "
2463 "notification: %d\n", ret);
2464 goto out;
2465 }
2466
2467 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2468 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2469 if (ret) {
2470 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2471 goto out;
2472 }
2473 }
2474out:
2475 kfree(attr);
2476 return ret;
2477}
2478
2479static void qp_event_handler(struct ib_event *event, void *qp_context)
2480{
2481 struct ib_mad_qp_info *qp_info = qp_context;
2482
2483 /* It's worse than that! He's dead, Jim! */
2484 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2485 event->event, qp_info->qp->qp_num);
2486}
2487
2488static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2489 struct ib_mad_queue *mad_queue)
2490{
2491 mad_queue->qp_info = qp_info;
2492 mad_queue->count = 0;
2493 spin_lock_init(&mad_queue->lock);
2494 INIT_LIST_HEAD(&mad_queue->list);
2495}
2496
2497static void init_mad_qp(struct ib_mad_port_private *port_priv,
2498 struct ib_mad_qp_info *qp_info)
2499{
2500 qp_info->port_priv = port_priv;
2501 init_mad_queue(qp_info, &qp_info->send_queue);
2502 init_mad_queue(qp_info, &qp_info->recv_queue);
2503 INIT_LIST_HEAD(&qp_info->overflow_list);
2504 spin_lock_init(&qp_info->snoop_lock);
2505 qp_info->snoop_table = NULL;
2506 qp_info->snoop_table_size = 0;
2507 atomic_set(&qp_info->snoop_count, 0);
2508}
2509
2510static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2511 enum ib_qp_type qp_type)
2512{
2513 struct ib_qp_init_attr qp_init_attr;
2514 int ret;
2515
2516 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2517 qp_init_attr.send_cq = qp_info->port_priv->cq;
2518 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2519 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2520 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2521 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2522 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2523 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2524 qp_init_attr.qp_type = qp_type;
2525 qp_init_attr.port_num = qp_info->port_priv->port_num;
2526 qp_init_attr.qp_context = qp_info;
2527 qp_init_attr.event_handler = qp_event_handler;
2528 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2529 if (IS_ERR(qp_info->qp)) {
2530 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2531 get_spl_qp_index(qp_type));
2532 ret = PTR_ERR(qp_info->qp);
2533 goto error;
2534 }
2535 /* Use minimum queue sizes unless the CQ is resized */
2536 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2537 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2538 return 0;
2539
2540error:
2541 return ret;
2542}
2543
2544static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2545{
2546 ib_destroy_qp(qp_info->qp);
2547 if (qp_info->snoop_table)
2548 kfree(qp_info->snoop_table);
2549}
2550
2551/*
2552 * Open the port
2553 * Create the QP, PD, MR, and CQ if needed
2554 */
2555static int ib_mad_port_open(struct ib_device *device,
2556 int port_num)
2557{
2558 int ret, cq_size;
2559 struct ib_mad_port_private *port_priv;
2560 unsigned long flags;
2561 char name[sizeof "ib_mad123"];
2562
1da177e4
LT		 2563 /* Create new device info */
2564 port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
2565 if (!port_priv) {
2566 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2567 return -ENOMEM;
2568 }
2569 memset(port_priv, 0, sizeof *port_priv);
2570 port_priv->device = device;
2571 port_priv->port_num = port_num;
2572 spin_lock_init(&port_priv->reg_lock);
2573 INIT_LIST_HEAD(&port_priv->agent_list);
2574 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2575 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2576
2577 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2578 port_priv->cq = ib_create_cq(port_priv->device,
5dd2ce12 2579 ib_mad_thread_completion_handler,
1da177e4
LT		 2580 NULL, port_priv, cq_size);
2581 if (IS_ERR(port_priv->cq)) {
2582 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2583 ret = PTR_ERR(port_priv->cq);
2584 goto error3;
2585 }
2586
2587 port_priv->pd = ib_alloc_pd(device);
2588 if (IS_ERR(port_priv->pd)) {
2589 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2590 ret = PTR_ERR(port_priv->pd);
2591 goto error4;
2592 }
2593
2594 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2595 if (IS_ERR(port_priv->mr)) {
2596 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2597 ret = PTR_ERR(port_priv->mr);
2598 goto error5;
2599 }
2600
2601 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2602 if (ret)
2603 goto error6;
2604 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2605 if (ret)
2606 goto error7;
2607
2608 snprintf(name, sizeof name, "ib_mad%d", port_num);
2609 port_priv->wq = create_singlethread_workqueue(name);
2610 if (!port_priv->wq) {
2611 ret = -ENOMEM;
2612 goto error8;
2613 }
2614 INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2615
2616 ret = ib_mad_port_start(port_priv);
2617 if (ret) {
2618 printk(KERN_ERR PFX "Couldn't start port\n");
2619 goto error9;
2620 }
2621
2622 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2623 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2624 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2625 return 0;
2626
2627error9:
2628 destroy_workqueue(port_priv->wq);
2629error8:
2630 destroy_mad_qp(&port_priv->qp_info[1]);
2631error7:
2632 destroy_mad_qp(&port_priv->qp_info[0]);
2633error6:
2634 ib_dereg_mr(port_priv->mr);
2635error5:
2636 ib_dealloc_pd(port_priv->pd);
2637error4:
2638 ib_destroy_cq(port_priv->cq);
2639 cleanup_recv_queue(&port_priv->qp_info[1]);
2640 cleanup_recv_queue(&port_priv->qp_info[0]);
2641error3:
2642 kfree(port_priv);
2643
2644 return ret;
2645}
2646
2647/*
2648 * Close the port
2649 * If there are no classes using the port, free the port
2650 * resources (CQ, MR, PD, QP) and remove the port's info structure
2651 */
2652static int ib_mad_port_close(struct ib_device *device, int port_num)
2653{
2654 struct ib_mad_port_private *port_priv;
2655 unsigned long flags;
2656
2657 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2658 port_priv = __ib_get_mad_port(device, port_num);
2659 if (port_priv == NULL) {
2660 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2661 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2662 return -ENODEV;
2663 }
2664 list_del(&port_priv->port_list);
2665 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2666
2667 /* Stop processing completions. */
2668 flush_workqueue(port_priv->wq);
2669 destroy_workqueue(port_priv->wq);
2670 destroy_mad_qp(&port_priv->qp_info[1]);
2671 destroy_mad_qp(&port_priv->qp_info[0]);
2672 ib_dereg_mr(port_priv->mr);
2673 ib_dealloc_pd(port_priv->pd);
2674 ib_destroy_cq(port_priv->cq);
2675 cleanup_recv_queue(&port_priv->qp_info[1]);
2676 cleanup_recv_queue(&port_priv->qp_info[0]);
2677 /* XXX: Handle deallocation of MAD registration tables */
2678
2679 kfree(port_priv);
2680
2681 return 0;
2682}
2683
2684static void ib_mad_init_device(struct ib_device *device)
2685{
f68bcc2d 2686 int num_ports, cur_port, i;
1da177e4
LT		 2687
2688 if (device->node_type == IB_NODE_SWITCH) {
2689 num_ports = 1;
2690 cur_port = 0;
2691 } else {
2692 num_ports = device->phys_port_cnt;
2693 cur_port = 1;
2694 }
2695 for (i = 0; i < num_ports; i++, cur_port++) {
f68bcc2d 2696 if (ib_mad_port_open(device, cur_port)) {
1da177e4
LT		 2697 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2698 device->name, cur_port);
2699 goto error_device_open;
2700 }
f68bcc2d 2701 if (ib_agent_port_open(device, cur_port)) {
1da177e4
LT		 2702 printk(KERN_ERR PFX "Couldn't open %s port %d "
2703 "for agents\n",
2704 device->name, cur_port);
2705 goto error_device_open;
2706 }
2707 }
f68bcc2d 2708 return;
1da177e4
LT		 2709
2710error_device_open:
2711 while (i > 0) {
2712 cur_port--;
f68bcc2d 2713 if (ib_agent_port_close(device, cur_port))
1da177e4
LT		 2714 printk(KERN_ERR PFX "Couldn't close %s port %d "
2715 "for agents\n",
2716 device->name, cur_port);
f68bcc2d 2717 if (ib_mad_port_close(device, cur_port))
1da177e4
LT		 2718 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2719 device->name, cur_port);
1da177e4
LT		 2720 i--;
2721 }
1da177e4
LT		 2722}
2723
2724static void ib_mad_remove_device(struct ib_device *device)
2725{
f68bcc2d 2726 int i, num_ports, cur_port;
1da177e4
LT		 2727
2728 if (device->node_type == IB_NODE_SWITCH) {
2729 num_ports = 1;
2730 cur_port = 0;
2731 } else {
2732 num_ports = device->phys_port_cnt;
2733 cur_port = 1;
2734 }
2735 for (i = 0; i < num_ports; i++, cur_port++) {
f68bcc2d 2736 if (ib_agent_port_close(device, cur_port))
1da177e4
LT		 2737 printk(KERN_ERR PFX "Couldn't close %s port %d "
2738 "for agents\n",
2739 device->name, cur_port);
f68bcc2d 2740 if (ib_mad_port_close(device, cur_port))
1da177e4
LT		 2741 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2742 device->name, cur_port);
1da177e4
LT		 2743 }
2744}
2745
2746static struct ib_client mad_client = {
2747 .name = "mad",
2748 .add = ib_mad_init_device,
2749 .remove = ib_mad_remove_device
2750};
2751
2752static int __init ib_mad_init_module(void)
2753{
2754 int ret;
2755
2756 spin_lock_init(&ib_mad_port_list_lock);
2757 spin_lock_init(&ib_agent_port_list_lock);
2758
2759 ib_mad_cache = kmem_cache_create("ib_mad",
2760 sizeof(struct ib_mad_private),
2761 0,
2762 SLAB_HWCACHE_ALIGN,
2763 NULL,
2764 NULL);
2765 if (!ib_mad_cache) {
2766 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2767 ret = -ENOMEM;
2768 goto error1;
2769 }
2770
2771 INIT_LIST_HEAD(&ib_mad_port_list);
2772
2773 if (ib_register_client(&mad_client)) {
2774 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2775 ret = -EINVAL;
2776 goto error2;
2777 }
2778
2779 return 0;
2780
2781error2:
2782 kmem_cache_destroy(ib_mad_cache);
2783error1:
2784 return ret;
2785}
2786
2787static void __exit ib_mad_cleanup_module(void)
2788{
2789 ib_unregister_client(&mad_client);
2790
2791 if (kmem_cache_destroy(ib_mad_cache)) {
2792 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2793 }
2794}
2795
2796module_init(ib_mad_init_module);
2797module_exit(ib_mad_cleanup_module);
fa619a77 2798
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