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[PATCH] IB: Eliminate redundant NULL checks
[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
696 build_smp_wc(send_wr->wr_id, smp->dr_slid, send_wr->wr.ud.pkey_index,
697 send_wr->wr.ud.port_num, &mad_wc);
698
699 /* No GRH for DR SMP */
700 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
701 (struct ib_mad *)smp,
702 (struct ib_mad *)&mad_priv->mad);
703 switch (ret)
704 {
705 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
4a0754fa 706 if (response_mad(&mad_priv->mad.mad) &&
1da177e4
LT		 707 mad_agent_priv->agent.recv_handler) {
708 local->mad_priv = mad_priv;
709 local->recv_mad_agent = mad_agent_priv;
710 /*
711 * Reference MAD agent until receive
712 * side of local completion handled
713 */
714 atomic_inc(&mad_agent_priv->refcount);
715 } else
716 kmem_cache_free(ib_mad_cache, mad_priv);
717 break;
718 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
719 kmem_cache_free(ib_mad_cache, mad_priv);
720 break;
721 case IB_MAD_RESULT_SUCCESS:
722 /* Treat like an incoming receive MAD */
1da177e4
LT		 723 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
724 mad_agent_priv->agent.port_num);
725 if (port_priv) {
726 mad_priv->mad.mad.mad_hdr.tid =
727 ((struct ib_mad *)smp)->mad_hdr.tid;
728 recv_mad_agent = find_mad_agent(port_priv,
4a0754fa 729 &mad_priv->mad.mad);
1da177e4
LT		 730 }
731 if (!port_priv || !recv_mad_agent) {
732 kmem_cache_free(ib_mad_cache, mad_priv);
733 kfree(local);
734 ret = 0;
735 goto out;
736 }
737 local->mad_priv = mad_priv;
738 local->recv_mad_agent = recv_mad_agent;
739 break;
740 default:
741 kmem_cache_free(ib_mad_cache, mad_priv);
742 kfree(local);
743 ret = -EINVAL;
744 goto out;
745 }
746
747 local->send_wr = *send_wr;
748 local->send_wr.sg_list = local->sg_list;
749 memcpy(local->sg_list, send_wr->sg_list,
750 sizeof *send_wr->sg_list * send_wr->num_sge);
751 local->send_wr.next = NULL;
752 local->tid = send_wr->wr.ud.mad_hdr->tid;
753 local->wr_id = send_wr->wr_id;
754 /* Reference MAD agent until send side of local completion handled */
755 atomic_inc(&mad_agent_priv->refcount);
756 /* Queue local completion to local list */
757 spin_lock_irqsave(&mad_agent_priv->lock, flags);
758 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
759 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
760 queue_work(mad_agent_priv->qp_info->port_priv->wq,
b82cab6b 761 &mad_agent_priv->local_work);
1da177e4
LT		 762 ret = 1;
763out:
764 return ret;
765}
766
824c8ae7
HR		 767static int get_buf_length(int hdr_len, int data_len)
768{
769 int seg_size, pad;
770
771 seg_size = sizeof(struct ib_mad) - hdr_len;
772 if (data_len && seg_size) {
773 pad = seg_size - data_len % seg_size;
774 if (pad == seg_size)
775 pad = 0;
776 } else
777 pad = seg_size;
778 return hdr_len + data_len + pad;
779}
780
781struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
782 u32 remote_qpn, u16 pkey_index,
d2082ee5 783 struct ib_ah *ah, int rmpp_active,
824c8ae7
HR		 784 int hdr_len, int data_len,
785 unsigned int __nocast gfp_mask)
786{
787 struct ib_mad_agent_private *mad_agent_priv;
788 struct ib_mad_send_buf *send_buf;
789 int buf_size;
790 void *buf;
791
792 mad_agent_priv = container_of(mad_agent,
793 struct ib_mad_agent_private, agent);
794 buf_size = get_buf_length(hdr_len, data_len);
795
fa619a77
HR		 796 if ((!mad_agent->rmpp_version &&
797 (rmpp_active || buf_size > sizeof(struct ib_mad))) ||
798 (!rmpp_active && buf_size > sizeof(struct ib_mad)))
799 return ERR_PTR(-EINVAL);
800
824c8ae7
HR		 801 buf = kmalloc(sizeof *send_buf + buf_size, gfp_mask);
802 if (!buf)
803 return ERR_PTR(-ENOMEM);
df9f9ead 804 memset(buf, 0, sizeof *send_buf + buf_size);
824c8ae7
HR		 805
806 send_buf = buf + buf_size;
824c8ae7
HR		 807 send_buf->mad = buf;
808
809 send_buf->sge.addr = dma_map_single(mad_agent->device->dma_device,
810 buf, buf_size, DMA_TO_DEVICE);
811 pci_unmap_addr_set(send_buf, mapping, send_buf->sge.addr);
812 send_buf->sge.length = buf_size;
813 send_buf->sge.lkey = mad_agent->mr->lkey;
814
815 send_buf->send_wr.wr_id = (unsigned long) send_buf;
816 send_buf->send_wr.sg_list = &send_buf->sge;
817 send_buf->send_wr.num_sge = 1;
818 send_buf->send_wr.opcode = IB_WR_SEND;
819 send_buf->send_wr.send_flags = IB_SEND_SIGNALED;
820 send_buf->send_wr.wr.ud.ah = ah;
821 send_buf->send_wr.wr.ud.mad_hdr = &send_buf->mad->mad_hdr;
822 send_buf->send_wr.wr.ud.remote_qpn = remote_qpn;
823 send_buf->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
824 send_buf->send_wr.wr.ud.pkey_index = pkey_index;
fa619a77
HR		 825
826 if (rmpp_active) {
827 struct ib_rmpp_mad *rmpp_mad;
828 rmpp_mad = (struct ib_rmpp_mad *)send_buf->mad;
829 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(hdr_len -
830 offsetof(struct ib_rmpp_mad, data) + data_len);
831 rmpp_mad->rmpp_hdr.rmpp_version = mad_agent->rmpp_version;
832 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
833 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr,
834 IB_MGMT_RMPP_FLAG_ACTIVE);
835 }
836
824c8ae7
HR		 837 send_buf->mad_agent = mad_agent;
838 atomic_inc(&mad_agent_priv->refcount);
839 return send_buf;
840}
841EXPORT_SYMBOL(ib_create_send_mad);
842
843void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
844{
845 struct ib_mad_agent_private *mad_agent_priv;
846
847 mad_agent_priv = container_of(send_buf->mad_agent,
848 struct ib_mad_agent_private, agent);
849
850 dma_unmap_single(send_buf->mad_agent->device->dma_device,
851 pci_unmap_addr(send_buf, mapping),
852 send_buf->sge.length, DMA_TO_DEVICE);
853 kfree(send_buf->mad);
854
855 if (atomic_dec_and_test(&mad_agent_priv->refcount))
856 wake_up(&mad_agent_priv->wait);
857}
858EXPORT_SYMBOL(ib_free_send_mad);
859
fa619a77 860int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4
LT		 861{
862 struct ib_mad_qp_info *qp_info;
863 struct ib_send_wr *bad_send_wr;
cabe3cbc 864 struct list_head *list;
1da177e4
LT		 865 unsigned long flags;
866 int ret;
867
f8197a4e 868 /* Set WR ID to find mad_send_wr upon completion */
d760ce8f 869 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1da177e4
LT		 870 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
871 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
872
873 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
cabe3cbc 874 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
d760ce8f 875 ret = ib_post_send(mad_send_wr->mad_agent_priv->agent.qp,
1da177e4 876 &mad_send_wr->send_wr, &bad_send_wr);
cabe3cbc 877 list = &qp_info->send_queue.list;
1da177e4 878 } else {
1da177e4 879 ret = 0;
cabe3cbc 880 list = &qp_info->overflow_list;
1da177e4 881 }
cabe3cbc
HR		 882
883 if (!ret) {
884 qp_info->send_queue.count++;
885 list_add_tail(&mad_send_wr->mad_list.list, list);
886 }
887 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1da177e4
LT		 888 return ret;
889}
890
891/*
892 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
893 * with the registered client
894 */
895int ib_post_send_mad(struct ib_mad_agent *mad_agent,
896 struct ib_send_wr *send_wr,
897 struct ib_send_wr **bad_send_wr)
898{
899 int ret = -EINVAL;
900 struct ib_mad_agent_private *mad_agent_priv;
901
902 /* Validate supplied parameters */
903 if (!bad_send_wr)
904 goto error1;
905
906 if (!mad_agent || !send_wr)
907 goto error2;
908
909 if (!mad_agent->send_handler)
910 goto error2;
911
912 mad_agent_priv = container_of(mad_agent,
913 struct ib_mad_agent_private,
914 agent);
915
916 /* Walk list of send WRs and post each on send list */
917 while (send_wr) {
918 unsigned long flags;
919 struct ib_send_wr *next_send_wr;
920 struct ib_mad_send_wr_private *mad_send_wr;
921 struct ib_smp *smp;
922
923 /* Validate more parameters */
924 if (send_wr->num_sge > IB_MAD_SEND_REQ_MAX_SG)
925 goto error2;
926
927 if (send_wr->wr.ud.timeout_ms && !mad_agent->recv_handler)
928 goto error2;
929
930 if (!send_wr->wr.ud.mad_hdr) {
931 printk(KERN_ERR PFX "MAD header must be supplied "
932 "in WR %p\n", send_wr);
933 goto error2;
934 }
935
936 /*
937 * Save pointer to next work request to post in case the
938 * current one completes, and the user modifies the work
939 * request associated with the completion
940 */
941 next_send_wr = (struct ib_send_wr *)send_wr->next;
942
943 smp = (struct ib_smp *)send_wr->wr.ud.mad_hdr;
944 if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
945 ret = handle_outgoing_dr_smp(mad_agent_priv, smp,
946 send_wr);
947 if (ret < 0) /* error */
948 goto error2;
949 else if (ret == 1) /* locally consumed */
950 goto next;
951 }
952
953 /* Allocate MAD send WR tracking structure */
954 mad_send_wr = kmalloc(sizeof *mad_send_wr, GFP_ATOMIC);
955 if (!mad_send_wr) {
956 printk(KERN_ERR PFX "No memory for "
957 "ib_mad_send_wr_private\n");
958 ret = -ENOMEM;
959 goto error2;
960 }
fa619a77 961 memset(mad_send_wr, 0, sizeof *mad_send_wr);
1da177e4
LT		 962
963 mad_send_wr->send_wr = *send_wr;
964 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
965 memcpy(mad_send_wr->sg_list, send_wr->sg_list,
966 sizeof *send_wr->sg_list * send_wr->num_sge);
fa619a77 967 mad_send_wr->wr_id = send_wr->wr_id;
1da177e4 968 mad_send_wr->tid = send_wr->wr.ud.mad_hdr->tid;
d760ce8f 969 mad_send_wr->mad_agent_priv = mad_agent_priv;
1da177e4
LT		 970 /* Timeout will be updated after send completes */
971 mad_send_wr->timeout = msecs_to_jiffies(send_wr->wr.
972 ud.timeout_ms);
f75b7a52 973 mad_send_wr->retries = mad_send_wr->send_wr.wr.ud.retries;
1da177e4
LT		 974 /* One reference for each work request to QP + response */
975 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
976 mad_send_wr->status = IB_WC_SUCCESS;
977
978 /* Reference MAD agent until send completes */
979 atomic_inc(&mad_agent_priv->refcount);
980 spin_lock_irqsave(&mad_agent_priv->lock, flags);
981 list_add_tail(&mad_send_wr->agent_list,
982 &mad_agent_priv->send_list);
983 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
984
fa619a77
HR		 985 if (mad_agent_priv->agent.rmpp_version) {
986 ret = ib_send_rmpp_mad(mad_send_wr);
987 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
988 ret = ib_send_mad(mad_send_wr);
989 } else
990 ret = ib_send_mad(mad_send_wr);
991 if (ret < 0) {
1da177e4
LT		 992 /* Fail send request */
993 spin_lock_irqsave(&mad_agent_priv->lock, flags);
994 list_del(&mad_send_wr->agent_list);
995 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
996 atomic_dec(&mad_agent_priv->refcount);
997 goto error2;
998 }
999next:
1000 send_wr = next_send_wr;
1001 }
1002 return 0;
1003
1004error2:
1005 *bad_send_wr = send_wr;
1006error1:
1007 return ret;
1008}
1009EXPORT_SYMBOL(ib_post_send_mad);
1010
1011/*
1012 * ib_free_recv_mad - Returns data buffers used to receive
1013 * a MAD to the access layer
1014 */
1015void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1016{
fa619a77 1017 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1da177e4
LT		 1018 struct ib_mad_private_header *mad_priv_hdr;
1019 struct ib_mad_private *priv;
fa619a77 1020 struct list_head free_list;
1da177e4 1021
fa619a77
HR		 1022 INIT_LIST_HEAD(&free_list);
1023 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1da177e4 1024
fa619a77
HR		 1025 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1026 &free_list, list) {
1027 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1028 recv_buf);
1da177e4
LT		 1029 mad_priv_hdr = container_of(mad_recv_wc,
1030 struct ib_mad_private_header,
1031 recv_wc);
1032 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1033 header);
fa619a77 1034 kmem_cache_free(ib_mad_cache, priv);
1da177e4 1035 }
1da177e4
LT		 1036}
1037EXPORT_SYMBOL(ib_free_recv_mad);
1038
1da177e4
LT		 1039struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1040 u8 rmpp_version,
1041 ib_mad_send_handler send_handler,
1042 ib_mad_recv_handler recv_handler,
1043 void *context)
1044{
1045 return ERR_PTR(-EINVAL); /* XXX: for now */
1046}
1047EXPORT_SYMBOL(ib_redirect_mad_qp);
1048
1049int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1050 struct ib_wc *wc)
1051{
1052 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1053 return 0;
1054}
1055EXPORT_SYMBOL(ib_process_mad_wc);
1056
1057static int method_in_use(struct ib_mad_mgmt_method_table **method,
1058 struct ib_mad_reg_req *mad_reg_req)
1059{
1060 int i;
1061
1062 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1063 i < IB_MGMT_MAX_METHODS;
1064 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1065 1+i)) {
1066 if ((*method)->agent[i]) {
1067 printk(KERN_ERR PFX "Method %d already in use\n", i);
1068 return -EINVAL;
1069 }
1070 }
1071 return 0;
1072}
1073
1074static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1075{
1076 /* Allocate management method table */
1077 *method = kmalloc(sizeof **method, GFP_ATOMIC);
1078 if (!*method) {
1079 printk(KERN_ERR PFX "No memory for "
1080 "ib_mad_mgmt_method_table\n");
1081 return -ENOMEM;
1082 }
1083 /* Clear management method table */
1084 memset(*method, 0, sizeof **method);
1085
1086 return 0;
1087}
1088
1089/*
1090 * Check to see if there are any methods still in use
1091 */
1092static int check_method_table(struct ib_mad_mgmt_method_table *method)
1093{
1094 int i;
1095
1096 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1097 if (method->agent[i])
1098 return 1;
1099 return 0;
1100}
1101
1102/*
1103 * Check to see if there are any method tables for this class still in use
1104 */
1105static int check_class_table(struct ib_mad_mgmt_class_table *class)
1106{
1107 int i;
1108
1109 for (i = 0; i < MAX_MGMT_CLASS; i++)
1110 if (class->method_table[i])
1111 return 1;
1112 return 0;
1113}
1114
1115static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1116{
1117 int i;
1118
1119 for (i = 0; i < MAX_MGMT_OUI; i++)
1120 if (vendor_class->method_table[i])
1121 return 1;
1122 return 0;
1123}
1124
1125static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1126 char *oui)
1127{
1128 int i;
1129
1130 for (i = 0; i < MAX_MGMT_OUI; i++)
1131 /* Is there matching OUI for this vendor class ? */
1132 if (!memcmp(vendor_class->oui[i], oui, 3))
1133 return i;
1134
1135 return -1;
1136}
1137
1138static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1139{
1140 int i;
1141
1142 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1143 if (vendor->vendor_class[i])
1144 return 1;
1145
1146 return 0;
1147}
1148
1149static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1150 struct ib_mad_agent_private *agent)
1151{
1152 int i;
1153
1154 /* Remove any methods for this mad agent */
1155 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1156 if (method->agent[i] == agent) {
1157 method->agent[i] = NULL;
1158 }
1159 }
1160}
1161
1162static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1163 struct ib_mad_agent_private *agent_priv,
1164 u8 mgmt_class)
1165{
1166 struct ib_mad_port_private *port_priv;
1167 struct ib_mad_mgmt_class_table **class;
1168 struct ib_mad_mgmt_method_table **method;
1169 int i, ret;
1170
1171 port_priv = agent_priv->qp_info->port_priv;
1172 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1173 if (!*class) {
1174 /* Allocate management class table for "new" class version */
1175 *class = kmalloc(sizeof **class, GFP_ATOMIC);
1176 if (!*class) {
1177 printk(KERN_ERR PFX "No memory for "
1178 "ib_mad_mgmt_class_table\n");
1179 ret = -ENOMEM;
1180 goto error1;
1181 }
1182 /* Clear management class table */
1183 memset(*class, 0, sizeof(**class));
1184 /* Allocate method table for this management class */
1185 method = &(*class)->method_table[mgmt_class];
1186 if ((ret = allocate_method_table(method)))
1187 goto error2;
1188 } else {
1189 method = &(*class)->method_table[mgmt_class];
1190 if (!*method) {
1191 /* Allocate method table for this management class */
1192 if ((ret = allocate_method_table(method)))
1193 goto error1;
1194 }
1195 }
1196
1197 /* Now, make sure methods are not already in use */
1198 if (method_in_use(method, mad_reg_req))
1199 goto error3;
1200
1201 /* Finally, add in methods being registered */
1202 for (i = find_first_bit(mad_reg_req->method_mask,
1203 IB_MGMT_MAX_METHODS);
1204 i < IB_MGMT_MAX_METHODS;
1205 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1206 1+i)) {
1207 (*method)->agent[i] = agent_priv;
1208 }
1209 return 0;
1210
1211error3:
1212 /* Remove any methods for this mad agent */
1213 remove_methods_mad_agent(*method, agent_priv);
1214 /* Now, check to see if there are any methods in use */
1215 if (!check_method_table(*method)) {
1216 /* If not, release management method table */
1217 kfree(*method);
1218 *method = NULL;
1219 }
1220 ret = -EINVAL;
1221 goto error1;
1222error2:
1223 kfree(*class);
1224 *class = NULL;
1225error1:
1226 return ret;
1227}
1228
1229static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1230 struct ib_mad_agent_private *agent_priv)
1231{
1232 struct ib_mad_port_private *port_priv;
1233 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1234 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1235 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1236 struct ib_mad_mgmt_method_table **method;
1237 int i, ret = -ENOMEM;
1238 u8 vclass;
1239
1240 /* "New" vendor (with OUI) class */
1241 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1242 port_priv = agent_priv->qp_info->port_priv;
1243 vendor_table = &port_priv->version[
1244 mad_reg_req->mgmt_class_version].vendor;
1245 if (!*vendor_table) {
1246 /* Allocate mgmt vendor class table for "new" class version */
1247 vendor = kmalloc(sizeof *vendor, GFP_ATOMIC);
1248 if (!vendor) {
1249 printk(KERN_ERR PFX "No memory for "
1250 "ib_mad_mgmt_vendor_class_table\n");
1251 goto error1;
1252 }
1253 /* Clear management vendor class table */
1254 memset(vendor, 0, sizeof(*vendor));
1255 *vendor_table = vendor;
1256 }
1257 if (!(*vendor_table)->vendor_class[vclass]) {
1258 /* Allocate table for this management vendor class */
1259 vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC);
1260 if (!vendor_class) {
1261 printk(KERN_ERR PFX "No memory for "
1262 "ib_mad_mgmt_vendor_class\n");
1263 goto error2;
1264 }
1265 memset(vendor_class, 0, sizeof(*vendor_class));
1266 (*vendor_table)->vendor_class[vclass] = vendor_class;
1267 }
1268 for (i = 0; i < MAX_MGMT_OUI; i++) {
1269 /* Is there matching OUI for this vendor class ? */
1270 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1271 mad_reg_req->oui, 3)) {
1272 method = &(*vendor_table)->vendor_class[
1273 vclass]->method_table[i];
1274 BUG_ON(!*method);
1275 goto check_in_use;
1276 }
1277 }
1278 for (i = 0; i < MAX_MGMT_OUI; i++) {
1279 /* OUI slot available ? */
1280 if (!is_vendor_oui((*vendor_table)->vendor_class[
1281 vclass]->oui[i])) {
1282 method = &(*vendor_table)->vendor_class[
1283 vclass]->method_table[i];
1284 BUG_ON(*method);
1285 /* Allocate method table for this OUI */
1286 if ((ret = allocate_method_table(method)))
1287 goto error3;
1288 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1289 mad_reg_req->oui, 3);
1290 goto check_in_use;
1291 }
1292 }
1293 printk(KERN_ERR PFX "All OUI slots in use\n");
1294 goto error3;
1295
1296check_in_use:
1297 /* Now, make sure methods are not already in use */
1298 if (method_in_use(method, mad_reg_req))
1299 goto error4;
1300
1301 /* Finally, add in methods being registered */
1302 for (i = find_first_bit(mad_reg_req->method_mask,
1303 IB_MGMT_MAX_METHODS);
1304 i < IB_MGMT_MAX_METHODS;
1305 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1306 1+i)) {
1307 (*method)->agent[i] = agent_priv;
1308 }
1309 return 0;
1310
1311error4:
1312 /* Remove any methods for this mad agent */
1313 remove_methods_mad_agent(*method, agent_priv);
1314 /* Now, check to see if there are any methods in use */
1315 if (!check_method_table(*method)) {
1316 /* If not, release management method table */
1317 kfree(*method);
1318 *method = NULL;
1319 }
1320 ret = -EINVAL;
1321error3:
1322 if (vendor_class) {
1323 (*vendor_table)->vendor_class[vclass] = NULL;
1324 kfree(vendor_class);
1325 }
1326error2:
1327 if (vendor) {
1328 *vendor_table = NULL;
1329 kfree(vendor);
1330 }
1331error1:
1332 return ret;
1333}
1334
1335static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1336{
1337 struct ib_mad_port_private *port_priv;
1338 struct ib_mad_mgmt_class_table *class;
1339 struct ib_mad_mgmt_method_table *method;
1340 struct ib_mad_mgmt_vendor_class_table *vendor;
1341 struct ib_mad_mgmt_vendor_class *vendor_class;
1342 int index;
1343 u8 mgmt_class;
1344
1345 /*
1346 * Was MAD registration request supplied
1347 * with original registration ?
1348 */
1349 if (!agent_priv->reg_req) {
1350 goto out;
1351 }
1352
1353 port_priv = agent_priv->qp_info->port_priv;
1354 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1355 class = port_priv->version[
1356 agent_priv->reg_req->mgmt_class_version].class;
1357 if (!class)
1358 goto vendor_check;
1359
1360 method = class->method_table[mgmt_class];
1361 if (method) {
1362 /* Remove any methods for this mad agent */
1363 remove_methods_mad_agent(method, agent_priv);
1364 /* Now, check to see if there are any methods still in use */
1365 if (!check_method_table(method)) {
1366 /* If not, release management method table */
1367 kfree(method);
1368 class->method_table[mgmt_class] = NULL;
1369 /* Any management classes left ? */
1370 if (!check_class_table(class)) {
1371 /* If not, release management class table */
1372 kfree(class);
1373 port_priv->version[
1374 agent_priv->reg_req->
1375 mgmt_class_version].class = NULL;
1376 }
1377 }
1378 }
1379
1380vendor_check:
1381 if (!is_vendor_class(mgmt_class))
1382 goto out;
1383
1384 /* normalize mgmt_class to vendor range 2 */
1385 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1386 vendor = port_priv->version[
1387 agent_priv->reg_req->mgmt_class_version].vendor;
1388
1389 if (!vendor)
1390 goto out;
1391
1392 vendor_class = vendor->vendor_class[mgmt_class];
1393 if (vendor_class) {
1394 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1395 if (index < 0)
1396 goto out;
1397 method = vendor_class->method_table[index];
1398 if (method) {
1399 /* Remove any methods for this mad agent */
1400 remove_methods_mad_agent(method, agent_priv);
1401 /*
1402 * Now, check to see if there are
1403 * any methods still in use
1404 */
1405 if (!check_method_table(method)) {
1406 /* If not, release management method table */
1407 kfree(method);
1408 vendor_class->method_table[index] = NULL;
1409 memset(vendor_class->oui[index], 0, 3);
1410 /* Any OUIs left ? */
1411 if (!check_vendor_class(vendor_class)) {
1412 /* If not, release vendor class table */
1413 kfree(vendor_class);
1414 vendor->vendor_class[mgmt_class] = NULL;
1415 /* Any other vendor classes left ? */
1416 if (!check_vendor_table(vendor)) {
1417 kfree(vendor);
1418 port_priv->version[
1419 agent_priv->reg_req->
1420 mgmt_class_version].
1421 vendor = NULL;
1422 }
1423 }
1424 }
1425 }
1426 }
1427
1428out:
1429 return;
1430}
1431
1da177e4
LT		 1432static struct ib_mad_agent_private *
1433find_mad_agent(struct ib_mad_port_private *port_priv,
4a0754fa 1434 struct ib_mad *mad)
1da177e4
LT		 1435{
1436 struct ib_mad_agent_private *mad_agent = NULL;
1437 unsigned long flags;
1438
1439 spin_lock_irqsave(&port_priv->reg_lock, flags);
4a0754fa 1440 if (response_mad(mad)) {
1da177e4
LT		 1441 u32 hi_tid;
1442 struct ib_mad_agent_private *entry;
1443
1444 /*
1445 * Routing is based on high 32 bits of transaction ID
1446 * of MAD.
1447 */
1448 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1449 list_for_each_entry(entry, &port_priv->agent_list,
1450 agent_list) {
1451 if (entry->agent.hi_tid == hi_tid) {
1452 mad_agent = entry;
1453 break;
1454 }
1455 }
1456 } else {
1457 struct ib_mad_mgmt_class_table *class;
1458 struct ib_mad_mgmt_method_table *method;
1459 struct ib_mad_mgmt_vendor_class_table *vendor;
1460 struct ib_mad_mgmt_vendor_class *vendor_class;
1461 struct ib_vendor_mad *vendor_mad;
1462 int index;
1463
1464 /*
1465 * Routing is based on version, class, and method
1466 * For "newer" vendor MADs, also based on OUI
1467 */
1468 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1469 goto out;
1470 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1471 class = port_priv->version[
1472 mad->mad_hdr.class_version].class;
1473 if (!class)
1474 goto out;
1475 method = class->method_table[convert_mgmt_class(
1476 mad->mad_hdr.mgmt_class)];
1477 if (method)
1478 mad_agent = method->agent[mad->mad_hdr.method &
1479 ~IB_MGMT_METHOD_RESP];
1480 } else {
1481 vendor = port_priv->version[
1482 mad->mad_hdr.class_version].vendor;
1483 if (!vendor)
1484 goto out;
1485 vendor_class = vendor->vendor_class[vendor_class_index(
1486 mad->mad_hdr.mgmt_class)];
1487 if (!vendor_class)
1488 goto out;
1489 /* Find matching OUI */
1490 vendor_mad = (struct ib_vendor_mad *)mad;
1491 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1492 if (index == -1)
1493 goto out;
1494 method = vendor_class->method_table[index];
1495 if (method) {
1496 mad_agent = method->agent[mad->mad_hdr.method &
1497 ~IB_MGMT_METHOD_RESP];
1498 }
1499 }
1500 }
1501
1502 if (mad_agent) {
1503 if (mad_agent->agent.recv_handler)
1504 atomic_inc(&mad_agent->refcount);
1505 else {
1506 printk(KERN_NOTICE PFX "No receive handler for client "
1507 "%p on port %d\n",
1508 &mad_agent->agent, port_priv->port_num);
1509 mad_agent = NULL;
1510 }
1511 }
1512out:
1513 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1514
1515 return mad_agent;
1516}
1517
1518static int validate_mad(struct ib_mad *mad, u32 qp_num)
1519{
1520 int valid = 0;
1521
1522 /* Make sure MAD base version is understood */
1523 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1524 printk(KERN_ERR PFX "MAD received with unsupported base "
1525 "version %d\n", mad->mad_hdr.base_version);
1526 goto out;
1527 }
1528
1529 /* Filter SMI packets sent to other than QP0 */
1530 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1531 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1532 if (qp_num == 0)
1533 valid = 1;
1534 } else {
1535 /* Filter GSI packets sent to QP0 */
1536 if (qp_num != 0)
1537 valid = 1;
1538 }
1539
1540out:
1541 return valid;
1542}
1543
fa619a77
HR		 1544static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1545 struct ib_mad_hdr *mad_hdr)
1546{
1547 struct ib_rmpp_mad *rmpp_mad;
1548
1549 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1550 return !mad_agent_priv->agent.rmpp_version ||
1551 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1552 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1553 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1554}
1555
1556struct ib_mad_send_wr_private*
1557ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, u64 tid)
1da177e4
LT		 1558{
1559 struct ib_mad_send_wr_private *mad_send_wr;
1560
1561 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1562 agent_list) {
1563 if (mad_send_wr->tid == tid)
1564 return mad_send_wr;
1565 }
1566
1567 /*
1568 * It's possible to receive the response before we've
1569 * been notified that the send has completed
1570 */
1571 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1572 agent_list) {
fa619a77
HR		 1573 if (is_data_mad(mad_agent_priv,
1574 mad_send_wr->send_wr.wr.ud.mad_hdr) &&
1575 mad_send_wr->tid == tid && mad_send_wr->timeout) {
1da177e4
LT		 1576 /* Verify request has not been canceled */
1577 return (mad_send_wr->status == IB_WC_SUCCESS) ?
1578 mad_send_wr : NULL;
1579 }
1580 }
1581 return NULL;
1582}
1583
fa619a77 1584void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
6a0c435e
HR		 1585{
1586 mad_send_wr->timeout = 0;
1587 if (mad_send_wr->refcount == 1) {
1588 list_del(&mad_send_wr->agent_list);
1589 list_add_tail(&mad_send_wr->agent_list,
1590 &mad_send_wr->mad_agent_priv->done_list);
1591 }
1592}
1593
1da177e4 1594static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
4a0754fa 1595 struct ib_mad_recv_wc *mad_recv_wc)
1da177e4
LT		 1596{
1597 struct ib_mad_send_wr_private *mad_send_wr;
1598 struct ib_mad_send_wc mad_send_wc;
1599 unsigned long flags;
4a0754fa 1600 u64 tid;
1da177e4 1601
fa619a77
HR		 1602 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1603 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1604 if (mad_agent_priv->agent.rmpp_version) {
1605 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1606 mad_recv_wc);
1607 if (!mad_recv_wc) {
1608 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1609 wake_up(&mad_agent_priv->wait);
1610 return;
1611 }
1612 }
1613
1da177e4 1614 /* Complete corresponding request */
4a0754fa
HR		 1615 if (response_mad(mad_recv_wc->recv_buf.mad)) {
1616 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1da177e4 1617 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa619a77 1618 mad_send_wr = ib_find_send_mad(mad_agent_priv, tid);
1da177e4
LT		 1619 if (!mad_send_wr) {
1620 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
4a0754fa 1621 ib_free_recv_mad(mad_recv_wc);
1da177e4
LT		 1622 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1623 wake_up(&mad_agent_priv->wait);
1624 return;
1625 }
fa619a77 1626 ib_mark_mad_done(mad_send_wr);
1da177e4
LT		 1627 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1628
1629 /* Defined behavior is to complete response before request */
4a0754fa
HR		 1630 mad_recv_wc->wc->wr_id = mad_send_wr->wr_id;
1631 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1632 mad_recv_wc);
1da177e4
LT		 1633 atomic_dec(&mad_agent_priv->refcount);
1634
1635 mad_send_wc.status = IB_WC_SUCCESS;
1636 mad_send_wc.vendor_err = 0;
1637 mad_send_wc.wr_id = mad_send_wr->wr_id;
1638 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1639 } else {
4a0754fa
HR		 1640 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1641 mad_recv_wc);
1da177e4
LT		 1642 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1643 wake_up(&mad_agent_priv->wait);
1644 }
1645}
1646
1647static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1648 struct ib_wc *wc)
1649{
1650 struct ib_mad_qp_info *qp_info;
1651 struct ib_mad_private_header *mad_priv_hdr;
1652 struct ib_mad_private *recv, *response;
1653 struct ib_mad_list_head *mad_list;
1654 struct ib_mad_agent_private *mad_agent;
1da177e4
LT		 1655
1656 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1657 if (!response)
1658 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1659 "for response buffer\n");
1660
1661 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1662 qp_info = mad_list->mad_queue->qp_info;
1663 dequeue_mad(mad_list);
1664
1665 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1666 mad_list);
1667 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1668 dma_unmap_single(port_priv->device->dma_device,
1669 pci_unmap_addr(&recv->header, mapping),
1670 sizeof(struct ib_mad_private) -
1671 sizeof(struct ib_mad_private_header),
1672 DMA_FROM_DEVICE);
1673
1674 /* Setup MAD receive work completion from "normal" work completion */
24239aff
SH		 1675 recv->header.wc = *wc;
1676 recv->header.recv_wc.wc = &recv->header.wc;
1da177e4
LT		 1677 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1678 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1679 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1680
1681 if (atomic_read(&qp_info->snoop_count))
1682 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1683
1684 /* Validate MAD */
1685 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1686 goto out;
1687
1688 if (recv->mad.mad.mad_hdr.mgmt_class ==
1689 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1690 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1691 port_priv->device->node_type,
1692 port_priv->port_num,
1693 port_priv->device->phys_port_cnt))
1694 goto out;
1695 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1696 goto local;
1697 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1698 port_priv->device->node_type,
1699 port_priv->port_num))
1700 goto out;
1701 if (!smi_check_local_dr_smp(&recv->mad.smp,
1702 port_priv->device,
1703 port_priv->port_num))
1704 goto out;
1705 }
1706
1707local:
1708 /* Give driver "right of first refusal" on incoming MAD */
1709 if (port_priv->device->process_mad) {
1710 int ret;
1711
1712 if (!response) {
1713 printk(KERN_ERR PFX "No memory for response MAD\n");
1714 /*
1715 * Is it better to assume that
1716 * it wouldn't be processed ?
1717 */
1718 goto out;
1719 }
1720
1721 ret = port_priv->device->process_mad(port_priv->device, 0,
1722 port_priv->port_num,
1723 wc, &recv->grh,
1724 &recv->mad.mad,
1725 &response->mad.mad);
1726 if (ret & IB_MAD_RESULT_SUCCESS) {
1727 if (ret & IB_MAD_RESULT_CONSUMED)
1728 goto out;
1729 if (ret & IB_MAD_RESULT_REPLY) {
1730 /* Send response */
1731 if (!agent_send(response, &recv->grh, wc,
1732 port_priv->device,
1733 port_priv->port_num))
1734 response = NULL;
1735 goto out;
1736 }
1737 }
1738 }
1739
4a0754fa 1740 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1da177e4 1741 if (mad_agent) {
4a0754fa 1742 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1da177e4
LT		 1743 /*
1744 * recv is freed up in error cases in ib_mad_complete_recv
1745 * or via recv_handler in ib_mad_complete_recv()
1746 */
1747 recv = NULL;
1748 }
1749
1750out:
1751 /* Post another receive request for this QP */
1752 if (response) {
1753 ib_mad_post_receive_mads(qp_info, response);
1754 if (recv)
1755 kmem_cache_free(ib_mad_cache, recv);
1756 } else
1757 ib_mad_post_receive_mads(qp_info, recv);
1758}
1759
1760static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1761{
1762 struct ib_mad_send_wr_private *mad_send_wr;
1763 unsigned long delay;
1764
1765 if (list_empty(&mad_agent_priv->wait_list)) {
1766 cancel_delayed_work(&mad_agent_priv->timed_work);
1767 } else {
1768 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1769 struct ib_mad_send_wr_private,
1770 agent_list);
1771
1772 if (time_after(mad_agent_priv->timeout,
1773 mad_send_wr->timeout)) {
1774 mad_agent_priv->timeout = mad_send_wr->timeout;
1775 cancel_delayed_work(&mad_agent_priv->timed_work);
1776 delay = mad_send_wr->timeout - jiffies;
1777 if ((long)delay <= 0)
1778 delay = 1;
1779 queue_delayed_work(mad_agent_priv->qp_info->
1780 port_priv->wq,
1781 &mad_agent_priv->timed_work, delay);
1782 }
1783 }
1784}
1785
d760ce8f 1786static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4 1787{
d760ce8f 1788 struct ib_mad_agent_private *mad_agent_priv;
1da177e4
LT		 1789 struct ib_mad_send_wr_private *temp_mad_send_wr;
1790 struct list_head *list_item;
1791 unsigned long delay;
1792
d760ce8f 1793 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4
LT		 1794 list_del(&mad_send_wr->agent_list);
1795
1796 delay = mad_send_wr->timeout;
1797 mad_send_wr->timeout += jiffies;
1798
29bb33dd
HR		 1799 if (delay) {
1800 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1801 temp_mad_send_wr = list_entry(list_item,
1802 struct ib_mad_send_wr_private,
1803 agent_list);
1804 if (time_after(mad_send_wr->timeout,
1805 temp_mad_send_wr->timeout))
1806 break;
1807 }
1da177e4 1808 }
29bb33dd
HR		 1809 else
1810 list_item = &mad_agent_priv->wait_list;
1da177e4
LT		 1811 list_add(&mad_send_wr->agent_list, list_item);
1812
1813 /* Reschedule a work item if we have a shorter timeout */
1814 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1815 cancel_delayed_work(&mad_agent_priv->timed_work);
1816 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1817 &mad_agent_priv->timed_work, delay);
1818 }
1819}
1820
03b61ad2
HR		 1821void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1822 int timeout_ms)
1823{
1824 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1825 wait_for_response(mad_send_wr);
1826}
1827
1da177e4
LT		 1828/*
1829 * Process a send work completion
1830 */
fa619a77
HR		 1831void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1832 struct ib_mad_send_wc *mad_send_wc)
1da177e4
LT		 1833{
1834 struct ib_mad_agent_private *mad_agent_priv;
1835 unsigned long flags;
fa619a77 1836 int ret;
1da177e4 1837
d760ce8f 1838 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4 1839 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa619a77
HR		 1840 if (mad_agent_priv->agent.rmpp_version) {
1841 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1842 if (ret == IB_RMPP_RESULT_CONSUMED)
1843 goto done;
1844 } else
1845 ret = IB_RMPP_RESULT_UNHANDLED;
1846
1da177e4
LT		 1847 if (mad_send_wc->status != IB_WC_SUCCESS &&
1848 mad_send_wr->status == IB_WC_SUCCESS) {
1849 mad_send_wr->status = mad_send_wc->status;
1850 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1851 }
1852
1853 if (--mad_send_wr->refcount > 0) {
1854 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1855 mad_send_wr->status == IB_WC_SUCCESS) {
d760ce8f 1856 wait_for_response(mad_send_wr);
1da177e4 1857 }
fa619a77 1858 goto done;
1da177e4
LT		 1859 }
1860
1861 /* Remove send from MAD agent and notify client of completion */
1862 list_del(&mad_send_wr->agent_list);
1863 adjust_timeout(mad_agent_priv);
1864 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1865
1866 if (mad_send_wr->status != IB_WC_SUCCESS )
1867 mad_send_wc->status = mad_send_wr->status;
fa619a77
HR		 1868 if (ret != IB_RMPP_RESULT_INTERNAL)
1869 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1870 mad_send_wc);
1da177e4
LT		 1871
1872 /* Release reference on agent taken when sending */
1873 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1874 wake_up(&mad_agent_priv->wait);
1875
1876 kfree(mad_send_wr);
fa619a77
HR		 1877 return;
1878done:
1879 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1da177e4
LT		 1880}
1881
1882static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1883 struct ib_wc *wc)
1884{
1885 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
1886 struct ib_mad_list_head *mad_list;
1887 struct ib_mad_qp_info *qp_info;
1888 struct ib_mad_queue *send_queue;
1889 struct ib_send_wr *bad_send_wr;
1890 unsigned long flags;
1891 int ret;
1892
1893 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1894 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1895 mad_list);
1896 send_queue = mad_list->mad_queue;
1897 qp_info = send_queue->qp_info;
1898
1899retry:
1900 queued_send_wr = NULL;
1901 spin_lock_irqsave(&send_queue->lock, flags);
1902 list_del(&mad_list->list);
1903
1904 /* Move queued send to the send queue */
1905 if (send_queue->count-- > send_queue->max_active) {
1906 mad_list = container_of(qp_info->overflow_list.next,
1907 struct ib_mad_list_head, list);
1908 queued_send_wr = container_of(mad_list,
1909 struct ib_mad_send_wr_private,
1910 mad_list);
1911 list_del(&mad_list->list);
1912 list_add_tail(&mad_list->list, &send_queue->list);
1913 }
1914 spin_unlock_irqrestore(&send_queue->lock, flags);
1915
1916 /* Restore client wr_id in WC and complete send */
1917 wc->wr_id = mad_send_wr->wr_id;
1918 if (atomic_read(&qp_info->snoop_count))
1919 snoop_send(qp_info, &mad_send_wr->send_wr,
1920 (struct ib_mad_send_wc *)wc,
1921 IB_MAD_SNOOP_SEND_COMPLETIONS);
1922 ib_mad_complete_send_wr(mad_send_wr, (struct ib_mad_send_wc *)wc);
1923
1924 if (queued_send_wr) {
1925 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1926 &bad_send_wr);
1927 if (ret) {
1928 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1929 mad_send_wr = queued_send_wr;
1930 wc->status = IB_WC_LOC_QP_OP_ERR;
1931 goto retry;
1932 }
1933 }
1934}
1935
1936static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1937{
1938 struct ib_mad_send_wr_private *mad_send_wr;
1939 struct ib_mad_list_head *mad_list;
1940 unsigned long flags;
1941
1942 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1943 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1944 mad_send_wr = container_of(mad_list,
1945 struct ib_mad_send_wr_private,
1946 mad_list);
1947 mad_send_wr->retry = 1;
1948 }
1949 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1950}
1951
1952static void mad_error_handler(struct ib_mad_port_private *port_priv,
1953 struct ib_wc *wc)
1954{
1955 struct ib_mad_list_head *mad_list;
1956 struct ib_mad_qp_info *qp_info;
1957 struct ib_mad_send_wr_private *mad_send_wr;
1958 int ret;
1959
1960 /* Determine if failure was a send or receive */
1961 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1962 qp_info = mad_list->mad_queue->qp_info;
1963 if (mad_list->mad_queue == &qp_info->recv_queue)
1964 /*
1965 * Receive errors indicate that the QP has entered the error
1966 * state - error handling/shutdown code will cleanup
1967 */
1968 return;
1969
1970 /*
1971 * Send errors will transition the QP to SQE - move
1972 * QP to RTS and repost flushed work requests
1973 */
1974 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1975 mad_list);
1976 if (wc->status == IB_WC_WR_FLUSH_ERR) {
1977 if (mad_send_wr->retry) {
1978 /* Repost send */
1979 struct ib_send_wr *bad_send_wr;
1980
1981 mad_send_wr->retry = 0;
1982 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1983 &bad_send_wr);
1984 if (ret)
1985 ib_mad_send_done_handler(port_priv, wc);
1986 } else
1987 ib_mad_send_done_handler(port_priv, wc);
1988 } else {
1989 struct ib_qp_attr *attr;
1990
1991 /* Transition QP to RTS and fail offending send */
1992 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1993 if (attr) {
1994 attr->qp_state = IB_QPS_RTS;
1995 attr->cur_qp_state = IB_QPS_SQE;
1996 ret = ib_modify_qp(qp_info->qp, attr,
1997 IB_QP_STATE | IB_QP_CUR_STATE);
1998 kfree(attr);
1999 if (ret)
2000 printk(KERN_ERR PFX "mad_error_handler - "
2001 "ib_modify_qp to RTS : %d\n", ret);
2002 else
2003 mark_sends_for_retry(qp_info);
2004 }
2005 ib_mad_send_done_handler(port_priv, wc);
2006 }
2007}
2008
2009/*
2010 * IB MAD completion callback
2011 */
2012static void ib_mad_completion_handler(void *data)
2013{
2014 struct ib_mad_port_private *port_priv;
2015 struct ib_wc wc;
2016
2017 port_priv = (struct ib_mad_port_private *)data;
2018 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2019
2020 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2021 if (wc.status == IB_WC_SUCCESS) {
2022 switch (wc.opcode) {
2023 case IB_WC_SEND:
2024 ib_mad_send_done_handler(port_priv, &wc);
2025 break;
2026 case IB_WC_RECV:
2027 ib_mad_recv_done_handler(port_priv, &wc);
2028 break;
2029 default:
2030 BUG_ON(1);
2031 break;
2032 }
2033 } else
2034 mad_error_handler(port_priv, &wc);
2035 }
2036}
2037
2038static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2039{
2040 unsigned long flags;
2041 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2042 struct ib_mad_send_wc mad_send_wc;
2043 struct list_head cancel_list;
2044
2045 INIT_LIST_HEAD(&cancel_list);
2046
2047 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2048 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2049 &mad_agent_priv->send_list, agent_list) {
2050 if (mad_send_wr->status == IB_WC_SUCCESS) {
2051 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2052 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2053 }
2054 }
2055
2056 /* Empty wait list to prevent receives from finding a request */
2057 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2c153b93
HR		 2058 /* Empty local completion list as well */
2059 list_splice_init(&mad_agent_priv->local_list, &cancel_list);
1da177e4
LT		 2060 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2061
2062 /* Report all cancelled requests */
2063 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2064 mad_send_wc.vendor_err = 0;
2065
2066 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2067 &cancel_list, agent_list) {
2068 mad_send_wc.wr_id = mad_send_wr->wr_id;
2069 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2070 &mad_send_wc);
2071
2072 list_del(&mad_send_wr->agent_list);
2073 kfree(mad_send_wr);
2074 atomic_dec(&mad_agent_priv->refcount);
2075 }
2076}
2077
2078static struct ib_mad_send_wr_private*
cabe3cbc 2079find_send_by_wr_id(struct ib_mad_agent_private *mad_agent_priv, u64 wr_id)
1da177e4
LT		 2080{
2081 struct ib_mad_send_wr_private *mad_send_wr;
2082
2083 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2084 agent_list) {
2085 if (mad_send_wr->wr_id == wr_id)
2086 return mad_send_wr;
2087 }
2088
2089 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2090 agent_list) {
fa619a77
HR		 2091 if (is_data_mad(mad_agent_priv,
2092 mad_send_wr->send_wr.wr.ud.mad_hdr) &&
2093 mad_send_wr->wr_id == wr_id)
1da177e4
LT		 2094 return mad_send_wr;
2095 }
2096 return NULL;
2097}
2098
03b61ad2 2099int ib_modify_mad(struct ib_mad_agent *mad_agent, u64 wr_id, u32 timeout_ms)
1da177e4
LT		 2100{
2101 struct ib_mad_agent_private *mad_agent_priv;
2102 struct ib_mad_send_wr_private *mad_send_wr;
2103 unsigned long flags;
cabe3cbc 2104 int active;
1da177e4
LT		 2105
2106 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2107 agent);
2108 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2109 mad_send_wr = find_send_by_wr_id(mad_agent_priv, wr_id);
03b61ad2 2110 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
1da177e4 2111 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2 2112 return -EINVAL;
1da177e4
LT		 2113 }
2114
cabe3cbc 2115 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
03b61ad2 2116 if (!timeout_ms) {
1da177e4 2117 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
03b61ad2 2118 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1da177e4
LT		 2119 }
2120
03b61ad2 2121 mad_send_wr->send_wr.wr.ud.timeout_ms = timeout_ms;
cabe3cbc 2122 if (active)
03b61ad2
HR		 2123 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2124 else
2125 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2126
1da177e4 2127 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2
HR		 2128 return 0;
2129}
2130EXPORT_SYMBOL(ib_modify_mad);
1da177e4 2131
03b61ad2
HR		 2132void ib_cancel_mad(struct ib_mad_agent *mad_agent, u64 wr_id)
2133{
2134 ib_modify_mad(mad_agent, wr_id, 0);
1da177e4
LT		 2135}
2136EXPORT_SYMBOL(ib_cancel_mad);
2137
2138static void local_completions(void *data)
2139{
2140 struct ib_mad_agent_private *mad_agent_priv;
2141 struct ib_mad_local_private *local;
2142 struct ib_mad_agent_private *recv_mad_agent;
2143 unsigned long flags;
2c153b93 2144 int recv = 0;
1da177e4
LT		 2145 struct ib_wc wc;
2146 struct ib_mad_send_wc mad_send_wc;
2147
2148 mad_agent_priv = (struct ib_mad_agent_private *)data;
2149
2150 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2151 while (!list_empty(&mad_agent_priv->local_list)) {
2152 local = list_entry(mad_agent_priv->local_list.next,
2153 struct ib_mad_local_private,
2154 completion_list);
2155 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2156 if (local->mad_priv) {
2157 recv_mad_agent = local->recv_mad_agent;
2158 if (!recv_mad_agent) {
2159 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
1da177e4
LT		 2160 goto local_send_completion;
2161 }
2162
2c153b93 2163 recv = 1;
1da177e4
LT		 2164 /*
2165 * Defined behavior is to complete response
2166 * before request
2167 */
2168 build_smp_wc(local->wr_id, IB_LID_PERMISSIVE,
2169 0 /* pkey index */,
2170 recv_mad_agent->agent.port_num, &wc);
2171
2172 local->mad_priv->header.recv_wc.wc = &wc;
2173 local->mad_priv->header.recv_wc.mad_len =
2174 sizeof(struct ib_mad);
fa619a77
HR		 2175 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2176 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2177 &local->mad_priv->header.recv_wc.rmpp_list);
1da177e4
LT		 2178 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2179 local->mad_priv->header.recv_wc.recv_buf.mad =
2180 &local->mad_priv->mad.mad;
2181 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2182 snoop_recv(recv_mad_agent->qp_info,
2183 &local->mad_priv->header.recv_wc,
2184 IB_MAD_SNOOP_RECVS);
2185 recv_mad_agent->agent.recv_handler(
2186 &recv_mad_agent->agent,
2187 &local->mad_priv->header.recv_wc);
2188 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2189 atomic_dec(&recv_mad_agent->refcount);
2190 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2191 }
2192
2193local_send_completion:
2194 /* Complete send */
2195 mad_send_wc.status = IB_WC_SUCCESS;
2196 mad_send_wc.vendor_err = 0;
2197 mad_send_wc.wr_id = local->wr_id;
2198 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2199 snoop_send(mad_agent_priv->qp_info, &local->send_wr,
2200 &mad_send_wc,
2201 IB_MAD_SNOOP_SEND_COMPLETIONS);
2202 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2203 &mad_send_wc);
2204
2205 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2206 list_del(&local->completion_list);
2207 atomic_dec(&mad_agent_priv->refcount);
2c153b93
HR		 2208 if (!recv)
2209 kmem_cache_free(ib_mad_cache, local->mad_priv);
1da177e4
LT		 2210 kfree(local);
2211 }
2212 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2213}
2214
f75b7a52
HR		 2215static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2216{
2217 int ret;
2218
2219 if (!mad_send_wr->retries--)
2220 return -ETIMEDOUT;
2221
2222 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_wr.
2223 wr.ud.timeout_ms);
2224
fa619a77
HR		 2225 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2226 ret = ib_retry_rmpp(mad_send_wr);
2227 switch (ret) {
2228 case IB_RMPP_RESULT_UNHANDLED:
2229 ret = ib_send_mad(mad_send_wr);
2230 break;
2231 case IB_RMPP_RESULT_CONSUMED:
2232 ret = 0;
2233 break;
2234 default:
2235 ret = -ECOMM;
2236 break;
2237 }
2238 } else
2239 ret = ib_send_mad(mad_send_wr);
f75b7a52
HR		 2240
2241 if (!ret) {
2242 mad_send_wr->refcount++;
f75b7a52
HR		 2243 list_add_tail(&mad_send_wr->agent_list,
2244 &mad_send_wr->mad_agent_priv->send_list);
2245 }
2246 return ret;
2247}
2248
1da177e4
LT		 2249static void timeout_sends(void *data)
2250{
2251 struct ib_mad_agent_private *mad_agent_priv;
2252 struct ib_mad_send_wr_private *mad_send_wr;
2253 struct ib_mad_send_wc mad_send_wc;
2254 unsigned long flags, delay;
2255
2256 mad_agent_priv = (struct ib_mad_agent_private *)data;
1da177e4
LT		 2257 mad_send_wc.vendor_err = 0;
2258
2259 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2260 while (!list_empty(&mad_agent_priv->wait_list)) {
2261 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2262 struct ib_mad_send_wr_private,
2263 agent_list);
2264
2265 if (time_after(mad_send_wr->timeout, jiffies)) {
2266 delay = mad_send_wr->timeout - jiffies;
2267 if ((long)delay <= 0)
2268 delay = 1;
2269 queue_delayed_work(mad_agent_priv->qp_info->
2270 port_priv->wq,
2271 &mad_agent_priv->timed_work, delay);
2272 break;
2273 }
2274
dbf9227b 2275 list_del(&mad_send_wr->agent_list);
29bb33dd
HR		 2276 if (mad_send_wr->status == IB_WC_SUCCESS &&
2277 !retry_send(mad_send_wr))
f75b7a52
HR		 2278 continue;
2279
1da177e4
LT		 2280 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2281
03b61ad2
HR		 2282 if (mad_send_wr->status == IB_WC_SUCCESS)
2283 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2284 else
2285 mad_send_wc.status = mad_send_wr->status;
1da177e4
LT		 2286 mad_send_wc.wr_id = mad_send_wr->wr_id;
2287 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2288 &mad_send_wc);
2289
2290 kfree(mad_send_wr);
2291 atomic_dec(&mad_agent_priv->refcount);
2292 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2293 }
2294 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2295}
2296
2297static void ib_mad_thread_completion_handler(struct ib_cq *cq)
2298{
2299 struct ib_mad_port_private *port_priv = cq->cq_context;
2300
2301 queue_work(port_priv->wq, &port_priv->work);
2302}
2303
2304/*
2305 * Allocate receive MADs and post receive WRs for them
2306 */
2307static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2308 struct ib_mad_private *mad)
2309{
2310 unsigned long flags;
2311 int post, ret;
2312 struct ib_mad_private *mad_priv;
2313 struct ib_sge sg_list;
2314 struct ib_recv_wr recv_wr, *bad_recv_wr;
2315 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2316
2317 /* Initialize common scatter list fields */
2318 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2319 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2320
2321 /* Initialize common receive WR fields */
2322 recv_wr.next = NULL;
2323 recv_wr.sg_list = &sg_list;
2324 recv_wr.num_sge = 1;
2325
2326 do {
2327 /* Allocate and map receive buffer */
2328 if (mad) {
2329 mad_priv = mad;
2330 mad = NULL;
2331 } else {
2332 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2333 if (!mad_priv) {
2334 printk(KERN_ERR PFX "No memory for receive buffer\n");
2335 ret = -ENOMEM;
2336 break;
2337 }
2338 }
2339 sg_list.addr = dma_map_single(qp_info->port_priv->
2340 device->dma_device,
2341 &mad_priv->grh,
2342 sizeof *mad_priv -
2343 sizeof mad_priv->header,
2344 DMA_FROM_DEVICE);
2345 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2346 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2347 mad_priv->header.mad_list.mad_queue = recv_queue;
2348
2349 /* Post receive WR */
2350 spin_lock_irqsave(&recv_queue->lock, flags);
2351 post = (++recv_queue->count < recv_queue->max_active);
2352 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2353 spin_unlock_irqrestore(&recv_queue->lock, flags);
2354 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2355 if (ret) {
2356 spin_lock_irqsave(&recv_queue->lock, flags);
2357 list_del(&mad_priv->header.mad_list.list);
2358 recv_queue->count--;
2359 spin_unlock_irqrestore(&recv_queue->lock, flags);
2360 dma_unmap_single(qp_info->port_priv->device->dma_device,
2361 pci_unmap_addr(&mad_priv->header,
2362 mapping),
2363 sizeof *mad_priv -
2364 sizeof mad_priv->header,
2365 DMA_FROM_DEVICE);
2366 kmem_cache_free(ib_mad_cache, mad_priv);
2367 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2368 break;
2369 }
2370 } while (post);
2371
2372 return ret;
2373}
2374
2375/*
2376 * Return all the posted receive MADs
2377 */
2378static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2379{
2380 struct ib_mad_private_header *mad_priv_hdr;
2381 struct ib_mad_private *recv;
2382 struct ib_mad_list_head *mad_list;
2383
2384 while (!list_empty(&qp_info->recv_queue.list)) {
2385
2386 mad_list = list_entry(qp_info->recv_queue.list.next,
2387 struct ib_mad_list_head, list);
2388 mad_priv_hdr = container_of(mad_list,
2389 struct ib_mad_private_header,
2390 mad_list);
2391 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2392 header);
2393
2394 /* Remove from posted receive MAD list */
2395 list_del(&mad_list->list);
2396
1da177e4
LT		 2397 dma_unmap_single(qp_info->port_priv->device->dma_device,
2398 pci_unmap_addr(&recv->header, mapping),
2399 sizeof(struct ib_mad_private) -
2400 sizeof(struct ib_mad_private_header),
2401 DMA_FROM_DEVICE);
2402 kmem_cache_free(ib_mad_cache, recv);
2403 }
2404
2405 qp_info->recv_queue.count = 0;
2406}
2407
2408/*
2409 * Start the port
2410 */
2411static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2412{
2413 int ret, i;
2414 struct ib_qp_attr *attr;
2415 struct ib_qp *qp;
2416
2417 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2418 if (!attr) {
2419 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2420 return -ENOMEM;
2421 }
2422
2423 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2424 qp = port_priv->qp_info[i].qp;
2425 /*
2426 * PKey index for QP1 is irrelevant but
2427 * one is needed for the Reset to Init transition
2428 */
2429 attr->qp_state = IB_QPS_INIT;
2430 attr->pkey_index = 0;
2431 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2432 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2433 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2434 if (ret) {
2435 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2436 "INIT: %d\n", i, ret);
2437 goto out;
2438 }
2439
2440 attr->qp_state = IB_QPS_RTR;
2441 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2442 if (ret) {
2443 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2444 "RTR: %d\n", i, ret);
2445 goto out;
2446 }
2447
2448 attr->qp_state = IB_QPS_RTS;
2449 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2450 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2451 if (ret) {
2452 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2453 "RTS: %d\n", i, ret);
2454 goto out;
2455 }
2456 }
2457
2458 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2459 if (ret) {
2460 printk(KERN_ERR PFX "Failed to request completion "
2461 "notification: %d\n", ret);
2462 goto out;
2463 }
2464
2465 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2466 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2467 if (ret) {
2468 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2469 goto out;
2470 }
2471 }
2472out:
2473 kfree(attr);
2474 return ret;
2475}
2476
2477static void qp_event_handler(struct ib_event *event, void *qp_context)
2478{
2479 struct ib_mad_qp_info *qp_info = qp_context;
2480
2481 /* It's worse than that! He's dead, Jim! */
2482 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2483 event->event, qp_info->qp->qp_num);
2484}
2485
2486static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2487 struct ib_mad_queue *mad_queue)
2488{
2489 mad_queue->qp_info = qp_info;
2490 mad_queue->count = 0;
2491 spin_lock_init(&mad_queue->lock);
2492 INIT_LIST_HEAD(&mad_queue->list);
2493}
2494
2495static void init_mad_qp(struct ib_mad_port_private *port_priv,
2496 struct ib_mad_qp_info *qp_info)
2497{
2498 qp_info->port_priv = port_priv;
2499 init_mad_queue(qp_info, &qp_info->send_queue);
2500 init_mad_queue(qp_info, &qp_info->recv_queue);
2501 INIT_LIST_HEAD(&qp_info->overflow_list);
2502 spin_lock_init(&qp_info->snoop_lock);
2503 qp_info->snoop_table = NULL;
2504 qp_info->snoop_table_size = 0;
2505 atomic_set(&qp_info->snoop_count, 0);
2506}
2507
2508static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2509 enum ib_qp_type qp_type)
2510{
2511 struct ib_qp_init_attr qp_init_attr;
2512 int ret;
2513
2514 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2515 qp_init_attr.send_cq = qp_info->port_priv->cq;
2516 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2517 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2518 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2519 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2520 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2521 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2522 qp_init_attr.qp_type = qp_type;
2523 qp_init_attr.port_num = qp_info->port_priv->port_num;
2524 qp_init_attr.qp_context = qp_info;
2525 qp_init_attr.event_handler = qp_event_handler;
2526 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2527 if (IS_ERR(qp_info->qp)) {
2528 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2529 get_spl_qp_index(qp_type));
2530 ret = PTR_ERR(qp_info->qp);
2531 goto error;
2532 }
2533 /* Use minimum queue sizes unless the CQ is resized */
2534 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2535 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2536 return 0;
2537
2538error:
2539 return ret;
2540}
2541
2542static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2543{
2544 ib_destroy_qp(qp_info->qp);
2545 if (qp_info->snoop_table)
2546 kfree(qp_info->snoop_table);
2547}
2548
2549/*
2550 * Open the port
2551 * Create the QP, PD, MR, and CQ if needed
2552 */
2553static int ib_mad_port_open(struct ib_device *device,
2554 int port_num)
2555{
2556 int ret, cq_size;
2557 struct ib_mad_port_private *port_priv;
2558 unsigned long flags;
2559 char name[sizeof "ib_mad123"];
2560
1da177e4
LT		 2561 /* Create new device info */
2562 port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
2563 if (!port_priv) {
2564 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2565 return -ENOMEM;
2566 }
2567 memset(port_priv, 0, sizeof *port_priv);
2568 port_priv->device = device;
2569 port_priv->port_num = port_num;
2570 spin_lock_init(&port_priv->reg_lock);
2571 INIT_LIST_HEAD(&port_priv->agent_list);
2572 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2573 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2574
2575 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2576 port_priv->cq = ib_create_cq(port_priv->device,
2577 (ib_comp_handler)
2578 ib_mad_thread_completion_handler,
2579 NULL, port_priv, cq_size);
2580 if (IS_ERR(port_priv->cq)) {
2581 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2582 ret = PTR_ERR(port_priv->cq);
2583 goto error3;
2584 }
2585
2586 port_priv->pd = ib_alloc_pd(device);
2587 if (IS_ERR(port_priv->pd)) {
2588 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2589 ret = PTR_ERR(port_priv->pd);
2590 goto error4;
2591 }
2592
2593 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2594 if (IS_ERR(port_priv->mr)) {
2595 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2596 ret = PTR_ERR(port_priv->mr);
2597 goto error5;
2598 }
2599
2600 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2601 if (ret)
2602 goto error6;
2603 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2604 if (ret)
2605 goto error7;
2606
2607 snprintf(name, sizeof name, "ib_mad%d", port_num);
2608 port_priv->wq = create_singlethread_workqueue(name);
2609 if (!port_priv->wq) {
2610 ret = -ENOMEM;
2611 goto error8;
2612 }
2613 INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2614
2615 ret = ib_mad_port_start(port_priv);
2616 if (ret) {
2617 printk(KERN_ERR PFX "Couldn't start port\n");
2618 goto error9;
2619 }
2620
2621 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2622 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2623 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2624 return 0;
2625
2626error9:
2627 destroy_workqueue(port_priv->wq);
2628error8:
2629 destroy_mad_qp(&port_priv->qp_info[1]);
2630error7:
2631 destroy_mad_qp(&port_priv->qp_info[0]);
2632error6:
2633 ib_dereg_mr(port_priv->mr);
2634error5:
2635 ib_dealloc_pd(port_priv->pd);
2636error4:
2637 ib_destroy_cq(port_priv->cq);
2638 cleanup_recv_queue(&port_priv->qp_info[1]);
2639 cleanup_recv_queue(&port_priv->qp_info[0]);
2640error3:
2641 kfree(port_priv);
2642
2643 return ret;
2644}
2645
2646/*
2647 * Close the port
2648 * If there are no classes using the port, free the port
2649 * resources (CQ, MR, PD, QP) and remove the port's info structure
2650 */
2651static int ib_mad_port_close(struct ib_device *device, int port_num)
2652{
2653 struct ib_mad_port_private *port_priv;
2654 unsigned long flags;
2655
2656 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2657 port_priv = __ib_get_mad_port(device, port_num);
2658 if (port_priv == NULL) {
2659 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2660 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2661 return -ENODEV;
2662 }
2663 list_del(&port_priv->port_list);
2664 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2665
2666 /* Stop processing completions. */
2667 flush_workqueue(port_priv->wq);
2668 destroy_workqueue(port_priv->wq);
2669 destroy_mad_qp(&port_priv->qp_info[1]);
2670 destroy_mad_qp(&port_priv->qp_info[0]);
2671 ib_dereg_mr(port_priv->mr);
2672 ib_dealloc_pd(port_priv->pd);
2673 ib_destroy_cq(port_priv->cq);
2674 cleanup_recv_queue(&port_priv->qp_info[1]);
2675 cleanup_recv_queue(&port_priv->qp_info[0]);
2676 /* XXX: Handle deallocation of MAD registration tables */
2677
2678 kfree(port_priv);
2679
2680 return 0;
2681}
2682
2683static void ib_mad_init_device(struct ib_device *device)
2684{
f68bcc2d 2685 int num_ports, cur_port, i;
1da177e4
LT		 2686
2687 if (device->node_type == IB_NODE_SWITCH) {
2688 num_ports = 1;
2689 cur_port = 0;
2690 } else {
2691 num_ports = device->phys_port_cnt;
2692 cur_port = 1;
2693 }
2694 for (i = 0; i < num_ports; i++, cur_port++) {
f68bcc2d 2695 if (ib_mad_port_open(device, cur_port)) {
1da177e4
LT		 2696 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2697 device->name, cur_port);
2698 goto error_device_open;
2699 }
f68bcc2d 2700 if (ib_agent_port_open(device, cur_port)) {
1da177e4
LT		 2701 printk(KERN_ERR PFX "Couldn't open %s port %d "
2702 "for agents\n",
2703 device->name, cur_port);
2704 goto error_device_open;
2705 }
2706 }
f68bcc2d 2707 return;
1da177e4
LT		 2708
2709error_device_open:
2710 while (i > 0) {
2711 cur_port--;
f68bcc2d 2712 if (ib_agent_port_close(device, cur_port))
1da177e4
LT		 2713 printk(KERN_ERR PFX "Couldn't close %s port %d "
2714 "for agents\n",
2715 device->name, cur_port);
f68bcc2d 2716 if (ib_mad_port_close(device, cur_port))
1da177e4
LT		 2717 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2718 device->name, cur_port);
1da177e4
LT		 2719 i--;
2720 }
1da177e4
LT		 2721}
2722
2723static void ib_mad_remove_device(struct ib_device *device)
2724{
f68bcc2d 2725 int i, num_ports, cur_port;
1da177e4
LT		 2726
2727 if (device->node_type == IB_NODE_SWITCH) {
2728 num_ports = 1;
2729 cur_port = 0;
2730 } else {
2731 num_ports = device->phys_port_cnt;
2732 cur_port = 1;
2733 }
2734 for (i = 0; i < num_ports; i++, cur_port++) {
f68bcc2d 2735 if (ib_agent_port_close(device, cur_port))
1da177e4
LT		 2736 printk(KERN_ERR PFX "Couldn't close %s port %d "
2737 "for agents\n",
2738 device->name, cur_port);
f68bcc2d 2739 if (ib_mad_port_close(device, cur_port))
1da177e4
LT		 2740 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2741 device->name, cur_port);
1da177e4
LT		 2742 }
2743}
2744
2745static struct ib_client mad_client = {
2746 .name = "mad",
2747 .add = ib_mad_init_device,
2748 .remove = ib_mad_remove_device
2749};
2750
2751static int __init ib_mad_init_module(void)
2752{
2753 int ret;
2754
2755 spin_lock_init(&ib_mad_port_list_lock);
2756 spin_lock_init(&ib_agent_port_list_lock);
2757
2758 ib_mad_cache = kmem_cache_create("ib_mad",
2759 sizeof(struct ib_mad_private),
2760 0,
2761 SLAB_HWCACHE_ALIGN,
2762 NULL,
2763 NULL);
2764 if (!ib_mad_cache) {
2765 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2766 ret = -ENOMEM;
2767 goto error1;
2768 }
2769
2770 INIT_LIST_HEAD(&ib_mad_port_list);
2771
2772 if (ib_register_client(&mad_client)) {
2773 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2774 ret = -EINVAL;
2775 goto error2;
2776 }
2777
2778 return 0;
2779
2780error2:
2781 kmem_cache_destroy(ib_mad_cache);
2782error1:
2783 return ret;
2784}
2785
2786static void __exit ib_mad_cleanup_module(void)
2787{
2788 ib_unregister_client(&mad_client);
2789
2790 if (kmem_cache_destroy(ib_mad_cache)) {
2791 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2792 }
2793}
2794
2795module_init(ib_mad_init_module);
2796module_exit(ib_mad_cleanup_module);
fa619a77 2797
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