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IB/mad: Allow tuning of QP0 and QP1 sizes
[linux-block.git] / drivers / infiniband / core / mad.c
CommitLineData
1da177e4 1/*
de493d47 2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
fa619a77
HR		 3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
b76aabc3 5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
1da177e4
LT		 6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
1da177e4 35 */
1da177e4 36#include <linux/dma-mapping.h>
9874e746 37#include <rdma/ib_cache.h>
1da177e4
LT		 38
39#include "mad_priv.h"
fa619a77 40#include "mad_rmpp.h"
1da177e4
LT		 41#include "smi.h"
42#include "agent.h"
43
44MODULE_LICENSE("Dual BSD/GPL");
45MODULE_DESCRIPTION("kernel IB MAD API");
46MODULE_AUTHOR("Hal Rosenstock");
47MODULE_AUTHOR("Sean Hefty");
48
b76aabc3
HR		 49int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
50int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
51
52module_param_named(send_queue_size, mad_sendq_size, int, 0444);
53MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
54module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
55MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
56
e54f8188 57static struct kmem_cache *ib_mad_cache;
fa619a77 58
1da177e4
LT		 59static struct list_head ib_mad_port_list;
60static u32 ib_mad_client_id = 0;
61
62/* Port list lock */
63static spinlock_t ib_mad_port_list_lock;
64
65
66/* Forward declarations */
67static int method_in_use(struct ib_mad_mgmt_method_table **method,
68 struct ib_mad_reg_req *mad_reg_req);
69static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
70static struct ib_mad_agent_private *find_mad_agent(
71 struct ib_mad_port_private *port_priv,
4a0754fa 72 struct ib_mad *mad);
1da177e4
LT		 73static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
74 struct ib_mad_private *mad);
75static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
c4028958
DH		 76static void timeout_sends(struct work_struct *work);
77static void local_completions(struct work_struct *work);
1da177e4
LT		 78static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
79 struct ib_mad_agent_private *agent_priv,
80 u8 mgmt_class);
81static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
82 struct ib_mad_agent_private *agent_priv);
83
84/*
85 * Returns a ib_mad_port_private structure or NULL for a device/port
86 * Assumes ib_mad_port_list_lock is being held
87 */
88static inline struct ib_mad_port_private *
89__ib_get_mad_port(struct ib_device *device, int port_num)
90{
91 struct ib_mad_port_private *entry;
92
93 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
94 if (entry->device == device && entry->port_num == port_num)
95 return entry;
96 }
97 return NULL;
98}
99
100/*
101 * Wrapper function to return a ib_mad_port_private structure or NULL
102 * for a device/port
103 */
104static inline struct ib_mad_port_private *
105ib_get_mad_port(struct ib_device *device, int port_num)
106{
107 struct ib_mad_port_private *entry;
108 unsigned long flags;
109
110 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
111 entry = __ib_get_mad_port(device, port_num);
112 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
113
114 return entry;
115}
116
117static inline u8 convert_mgmt_class(u8 mgmt_class)
118{
119 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
120 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
121 0 : mgmt_class;
122}
123
124static int get_spl_qp_index(enum ib_qp_type qp_type)
125{
126 switch (qp_type)
127 {
128 case IB_QPT_SMI:
129 return 0;
130 case IB_QPT_GSI:
131 return 1;
132 default:
133 return -1;
134 }
135}
136
137static int vendor_class_index(u8 mgmt_class)
138{
139 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
140}
141
142static int is_vendor_class(u8 mgmt_class)
143{
144 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
145 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
146 return 0;
147 return 1;
148}
149
150static int is_vendor_oui(char *oui)
151{
152 if (oui[0] || oui[1] || oui[2])
153 return 1;
154 return 0;
155}
156
157static int is_vendor_method_in_use(
158 struct ib_mad_mgmt_vendor_class *vendor_class,
159 struct ib_mad_reg_req *mad_reg_req)
160{
161 struct ib_mad_mgmt_method_table *method;
162 int i;
163
164 for (i = 0; i < MAX_MGMT_OUI; i++) {
165 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
166 method = vendor_class->method_table[i];
167 if (method) {
168 if (method_in_use(&method, mad_reg_req))
169 return 1;
170 else
171 break;
172 }
173 }
174 }
175 return 0;
176}
177
2527e681
SH		 178int ib_response_mad(struct ib_mad *mad)
179{
180 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
181 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
182 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
183 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
184}
185EXPORT_SYMBOL(ib_response_mad);
186
1da177e4
LT		 187/*
188 * ib_register_mad_agent - Register to send/receive MADs
189 */
190struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
191 u8 port_num,
192 enum ib_qp_type qp_type,
193 struct ib_mad_reg_req *mad_reg_req,
194 u8 rmpp_version,
195 ib_mad_send_handler send_handler,
196 ib_mad_recv_handler recv_handler,
197 void *context)
198{
199 struct ib_mad_port_private *port_priv;
200 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
201 struct ib_mad_agent_private *mad_agent_priv;
202 struct ib_mad_reg_req *reg_req = NULL;
203 struct ib_mad_mgmt_class_table *class;
204 struct ib_mad_mgmt_vendor_class_table *vendor;
205 struct ib_mad_mgmt_vendor_class *vendor_class;
206 struct ib_mad_mgmt_method_table *method;
207 int ret2, qpn;
208 unsigned long flags;
209 u8 mgmt_class, vclass;
210
211 /* Validate parameters */
212 qpn = get_spl_qp_index(qp_type);
213 if (qpn == -1)
214 goto error1;
215
fa619a77
HR		 216 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
217 goto error1;
1da177e4
LT		 218
219 /* Validate MAD registration request if supplied */
220 if (mad_reg_req) {
221 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
222 goto error1;
223 if (!recv_handler)
224 goto error1;
225 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
226 /*
227 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
228 * one in this range currently allowed
229 */
230 if (mad_reg_req->mgmt_class !=
231 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
232 goto error1;
233 } else if (mad_reg_req->mgmt_class == 0) {
234 /*
235 * Class 0 is reserved in IBA and is used for
236 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
237 */
238 goto error1;
239 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
240 /*
241 * If class is in "new" vendor range,
242 * ensure supplied OUI is not zero
243 */
244 if (!is_vendor_oui(mad_reg_req->oui))
245 goto error1;
246 }
618a3c03 247 /* Make sure class supplied is consistent with RMPP */
64cb9c6a 248 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
618a3c03
HR		 249 if (rmpp_version)
250 goto error1;
251 }
1da177e4
LT		 252 /* Make sure class supplied is consistent with QP type */
253 if (qp_type == IB_QPT_SMI) {
254 if ((mad_reg_req->mgmt_class !=
255 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
256 (mad_reg_req->mgmt_class !=
257 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
258 goto error1;
259 } else {
260 if ((mad_reg_req->mgmt_class ==
261 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
262 (mad_reg_req->mgmt_class ==
263 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
264 goto error1;
265 }
266 } else {
267 /* No registration request supplied */
268 if (!send_handler)
269 goto error1;
270 }
271
272 /* Validate device and port */
273 port_priv = ib_get_mad_port(device, port_num);
274 if (!port_priv) {
275 ret = ERR_PTR(-ENODEV);
276 goto error1;
277 }
278
279 /* Allocate structures */
de6eb66b 280 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
1da177e4
LT		 281 if (!mad_agent_priv) {
282 ret = ERR_PTR(-ENOMEM);
283 goto error1;
284 }
b82cab6b
HR		 285
286 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
287 IB_ACCESS_LOCAL_WRITE);
288 if (IS_ERR(mad_agent_priv->agent.mr)) {
289 ret = ERR_PTR(-ENOMEM);
290 goto error2;
291 }
1da177e4
LT		 292
293 if (mad_reg_req) {
294 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
295 if (!reg_req) {
296 ret = ERR_PTR(-ENOMEM);
b82cab6b 297 goto error3;
1da177e4
LT		 298 }
299 /* Make a copy of the MAD registration request */
300 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
301 }
302
303 /* Now, fill in the various structures */
1da177e4
LT		 304 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
305 mad_agent_priv->reg_req = reg_req;
fa619a77 306 mad_agent_priv->agent.rmpp_version = rmpp_version;
1da177e4
LT		 307 mad_agent_priv->agent.device = device;
308 mad_agent_priv->agent.recv_handler = recv_handler;
309 mad_agent_priv->agent.send_handler = send_handler;
310 mad_agent_priv->agent.context = context;
311 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
312 mad_agent_priv->agent.port_num = port_num;
d9620a4c
RC		 313 spin_lock_init(&mad_agent_priv->lock);
314 INIT_LIST_HEAD(&mad_agent_priv->send_list);
315 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
316 INIT_LIST_HEAD(&mad_agent_priv->done_list);
317 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
318 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
319 INIT_LIST_HEAD(&mad_agent_priv->local_list);
320 INIT_WORK(&mad_agent_priv->local_work, local_completions);
321 atomic_set(&mad_agent_priv->refcount, 1);
322 init_completion(&mad_agent_priv->comp);
1da177e4
LT		 323
324 spin_lock_irqsave(&port_priv->reg_lock, flags);
325 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
326
327 /*
328 * Make sure MAD registration (if supplied)
329 * is non overlapping with any existing ones
330 */
331 if (mad_reg_req) {
332 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
333 if (!is_vendor_class(mgmt_class)) {
334 class = port_priv->version[mad_reg_req->
335 mgmt_class_version].class;
336 if (class) {
337 method = class->method_table[mgmt_class];
338 if (method) {
339 if (method_in_use(&method,
340 mad_reg_req))
b82cab6b 341 goto error4;
1da177e4
LT		 342 }
343 }
344 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
345 mgmt_class);
346 } else {
347 /* "New" vendor class range */
348 vendor = port_priv->version[mad_reg_req->
349 mgmt_class_version].vendor;
350 if (vendor) {
351 vclass = vendor_class_index(mgmt_class);
352 vendor_class = vendor->vendor_class[vclass];
353 if (vendor_class) {
354 if (is_vendor_method_in_use(
355 vendor_class,
356 mad_reg_req))
b82cab6b 357 goto error4;
1da177e4
LT		 358 }
359 }
360 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
361 }
362 if (ret2) {
363 ret = ERR_PTR(ret2);
b82cab6b 364 goto error4;
1da177e4
LT		 365 }
366 }
367
368 /* Add mad agent into port's agent list */
369 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
370 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
371
1da177e4
LT		 372 return &mad_agent_priv->agent;
373
b82cab6b 374error4:
1da177e4
LT		 375 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
376 kfree(reg_req);
b82cab6b 377error3:
b82cab6b 378 ib_dereg_mr(mad_agent_priv->agent.mr);
2012a116
AB		 379error2:
380 kfree(mad_agent_priv);
1da177e4
LT		 381error1:
382 return ret;
383}
384EXPORT_SYMBOL(ib_register_mad_agent);
385
386static inline int is_snooping_sends(int mad_snoop_flags)
387{
388 return (mad_snoop_flags &
389 (/*IB_MAD_SNOOP_POSTED_SENDS |
390 IB_MAD_SNOOP_RMPP_SENDS |*/
391 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
392 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
393}
394
395static inline int is_snooping_recvs(int mad_snoop_flags)
396{
397 return (mad_snoop_flags &
398 (IB_MAD_SNOOP_RECVS /*|
399 IB_MAD_SNOOP_RMPP_RECVS*/));
400}
401
402static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
403 struct ib_mad_snoop_private *mad_snoop_priv)
404{
405 struct ib_mad_snoop_private **new_snoop_table;
406 unsigned long flags;
407 int i;
408
409 spin_lock_irqsave(&qp_info->snoop_lock, flags);
410 /* Check for empty slot in array. */
411 for (i = 0; i < qp_info->snoop_table_size; i++)
412 if (!qp_info->snoop_table[i])
413 break;
414
415 if (i == qp_info->snoop_table_size) {
416 /* Grow table. */
52805174
RD		 417 new_snoop_table = krealloc(qp_info->snoop_table,
418 sizeof mad_snoop_priv *
419 (qp_info->snoop_table_size + 1),
420 GFP_ATOMIC);
1da177e4
LT		 421 if (!new_snoop_table) {
422 i = -ENOMEM;
423 goto out;
424 }
52805174 425
1da177e4
LT		 426 qp_info->snoop_table = new_snoop_table;
427 qp_info->snoop_table_size++;
428 }
429 qp_info->snoop_table[i] = mad_snoop_priv;
430 atomic_inc(&qp_info->snoop_count);
431out:
432 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
433 return i;
434}
435
436struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
437 u8 port_num,
438 enum ib_qp_type qp_type,
439 int mad_snoop_flags,
440 ib_mad_snoop_handler snoop_handler,
441 ib_mad_recv_handler recv_handler,
442 void *context)
443{
444 struct ib_mad_port_private *port_priv;
445 struct ib_mad_agent *ret;
446 struct ib_mad_snoop_private *mad_snoop_priv;
447 int qpn;
448
449 /* Validate parameters */
450 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
451 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
452 ret = ERR_PTR(-EINVAL);
453 goto error1;
454 }
455 qpn = get_spl_qp_index(qp_type);
456 if (qpn == -1) {
457 ret = ERR_PTR(-EINVAL);
458 goto error1;
459 }
460 port_priv = ib_get_mad_port(device, port_num);
461 if (!port_priv) {
462 ret = ERR_PTR(-ENODEV);
463 goto error1;
464 }
465 /* Allocate structures */
de6eb66b 466 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
1da177e4
LT		 467 if (!mad_snoop_priv) {
468 ret = ERR_PTR(-ENOMEM);
469 goto error1;
470 }
471
472 /* Now, fill in the various structures */
1da177e4
LT		 473 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
474 mad_snoop_priv->agent.device = device;
475 mad_snoop_priv->agent.recv_handler = recv_handler;
476 mad_snoop_priv->agent.snoop_handler = snoop_handler;
477 mad_snoop_priv->agent.context = context;
478 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
479 mad_snoop_priv->agent.port_num = port_num;
480 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
1b52fa98 481 init_completion(&mad_snoop_priv->comp);
1da177e4
LT		 482 mad_snoop_priv->snoop_index = register_snoop_agent(
483 &port_priv->qp_info[qpn],
484 mad_snoop_priv);
485 if (mad_snoop_priv->snoop_index < 0) {
486 ret = ERR_PTR(mad_snoop_priv->snoop_index);
487 goto error2;
488 }
489
490 atomic_set(&mad_snoop_priv->refcount, 1);
491 return &mad_snoop_priv->agent;
492
493error2:
494 kfree(mad_snoop_priv);
495error1:
496 return ret;
497}
498EXPORT_SYMBOL(ib_register_mad_snoop);
499
1b52fa98
SH		 500static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
501{
502 if (atomic_dec_and_test(&mad_agent_priv->refcount))
503 complete(&mad_agent_priv->comp);
504}
505
506static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
507{
508 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
509 complete(&mad_snoop_priv->comp);
510}
511
1da177e4
LT		 512static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
513{
514 struct ib_mad_port_private *port_priv;
515 unsigned long flags;
516
517 /* Note that we could still be handling received MADs */
518
519 /*
520 * Canceling all sends results in dropping received response
521 * MADs, preventing us from queuing additional work
522 */
523 cancel_mads(mad_agent_priv);
1da177e4 524 port_priv = mad_agent_priv->qp_info->port_priv;
1da177e4 525 cancel_delayed_work(&mad_agent_priv->timed_work);
1da177e4
LT		 526
527 spin_lock_irqsave(&port_priv->reg_lock, flags);
528 remove_mad_reg_req(mad_agent_priv);
529 list_del(&mad_agent_priv->agent_list);
530 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
531
b82cab6b 532 flush_workqueue(port_priv->wq);
fa619a77 533 ib_cancel_rmpp_recvs(mad_agent_priv);
1da177e4 534
1b52fa98
SH		 535 deref_mad_agent(mad_agent_priv);
536 wait_for_completion(&mad_agent_priv->comp);
1da177e4 537
6044ec88 538 kfree(mad_agent_priv->reg_req);
b82cab6b 539 ib_dereg_mr(mad_agent_priv->agent.mr);
1da177e4
LT		 540 kfree(mad_agent_priv);
541}
542
543static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
544{
545 struct ib_mad_qp_info *qp_info;
546 unsigned long flags;
547
548 qp_info = mad_snoop_priv->qp_info;
549 spin_lock_irqsave(&qp_info->snoop_lock, flags);
550 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
551 atomic_dec(&qp_info->snoop_count);
552 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
553
1b52fa98
SH		 554 deref_snoop_agent(mad_snoop_priv);
555 wait_for_completion(&mad_snoop_priv->comp);
1da177e4
LT		 556
557 kfree(mad_snoop_priv);
558}
559
560/*
561 * ib_unregister_mad_agent - Unregisters a client from using MAD services
562 */
563int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
564{
565 struct ib_mad_agent_private *mad_agent_priv;
566 struct ib_mad_snoop_private *mad_snoop_priv;
567
568 /* If the TID is zero, the agent can only snoop. */
569 if (mad_agent->hi_tid) {
570 mad_agent_priv = container_of(mad_agent,
571 struct ib_mad_agent_private,
572 agent);
573 unregister_mad_agent(mad_agent_priv);
574 } else {
575 mad_snoop_priv = container_of(mad_agent,
576 struct ib_mad_snoop_private,
577 agent);
578 unregister_mad_snoop(mad_snoop_priv);
579 }
580 return 0;
581}
582EXPORT_SYMBOL(ib_unregister_mad_agent);
583
584static void dequeue_mad(struct ib_mad_list_head *mad_list)
585{
586 struct ib_mad_queue *mad_queue;
587 unsigned long flags;
588
589 BUG_ON(!mad_list->mad_queue);
590 mad_queue = mad_list->mad_queue;
591 spin_lock_irqsave(&mad_queue->lock, flags);
592 list_del(&mad_list->list);
593 mad_queue->count--;
594 spin_unlock_irqrestore(&mad_queue->lock, flags);
595}
596
597static void snoop_send(struct ib_mad_qp_info *qp_info,
34816ad9 598 struct ib_mad_send_buf *send_buf,
1da177e4
LT		 599 struct ib_mad_send_wc *mad_send_wc,
600 int mad_snoop_flags)
601{
602 struct ib_mad_snoop_private *mad_snoop_priv;
603 unsigned long flags;
604 int i;
605
606 spin_lock_irqsave(&qp_info->snoop_lock, flags);
607 for (i = 0; i < qp_info->snoop_table_size; i++) {
608 mad_snoop_priv = qp_info->snoop_table[i];
609 if (!mad_snoop_priv ||
610 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
611 continue;
612
613 atomic_inc(&mad_snoop_priv->refcount);
614 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
615 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
34816ad9 616 send_buf, mad_send_wc);
1b52fa98 617 deref_snoop_agent(mad_snoop_priv);
1da177e4
LT		 618 spin_lock_irqsave(&qp_info->snoop_lock, flags);
619 }
620 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
621}
622
623static void snoop_recv(struct ib_mad_qp_info *qp_info,
624 struct ib_mad_recv_wc *mad_recv_wc,
625 int mad_snoop_flags)
626{
627 struct ib_mad_snoop_private *mad_snoop_priv;
628 unsigned long flags;
629 int i;
630
631 spin_lock_irqsave(&qp_info->snoop_lock, flags);
632 for (i = 0; i < qp_info->snoop_table_size; i++) {
633 mad_snoop_priv = qp_info->snoop_table[i];
634 if (!mad_snoop_priv ||
635 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
636 continue;
637
638 atomic_inc(&mad_snoop_priv->refcount);
639 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
640 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
641 mad_recv_wc);
1b52fa98 642 deref_snoop_agent(mad_snoop_priv);
1da177e4
LT		 643 spin_lock_irqsave(&qp_info->snoop_lock, flags);
644 }
645 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
646}
647
062dbb69
MT		 648static void build_smp_wc(struct ib_qp *qp,
649 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
1da177e4
LT		 650 struct ib_wc *wc)
651{
652 memset(wc, 0, sizeof *wc);
653 wc->wr_id = wr_id;
654 wc->status = IB_WC_SUCCESS;
655 wc->opcode = IB_WC_RECV;
656 wc->pkey_index = pkey_index;
657 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
658 wc->src_qp = IB_QP0;
062dbb69 659 wc->qp = qp;
1da177e4
LT		 660 wc->slid = slid;
661 wc->sl = 0;
662 wc->dlid_path_bits = 0;
663 wc->port_num = port_num;
664}
665
666/*
667 * Return 0 if SMP is to be sent
668 * Return 1 if SMP was consumed locally (whether or not solicited)
669 * Return < 0 if error
670 */
671static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
34816ad9 672 struct ib_mad_send_wr_private *mad_send_wr)
1da177e4 673{
de493d47 674 int ret = 0;
34816ad9 675 struct ib_smp *smp = mad_send_wr->send_buf.mad;
1da177e4
LT		 676 unsigned long flags;
677 struct ib_mad_local_private *local;
678 struct ib_mad_private *mad_priv;
679 struct ib_mad_port_private *port_priv;
680 struct ib_mad_agent_private *recv_mad_agent = NULL;
681 struct ib_device *device = mad_agent_priv->agent.device;
1bae4dbf 682 u8 port_num;
1da177e4 683 struct ib_wc mad_wc;
34816ad9 684 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
1da177e4 685
1bae4dbf
HR		 686 if (device->node_type == RDMA_NODE_IB_SWITCH &&
687 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
688 port_num = send_wr->wr.ud.port_num;
689 else
690 port_num = mad_agent_priv->agent.port_num;
691
8cf3f04f
RC		 692 /*
693 * Directed route handling starts if the initial LID routed part of
694 * a request or the ending LID routed part of a response is empty.
695 * If we are at the start of the LID routed part, don't update the
696 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
697 */
698 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
699 IB_LID_PERMISSIVE &&
de493d47
HR		 700 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
701 IB_SMI_DISCARD) {
1da177e4
LT		 702 ret = -EINVAL;
703 printk(KERN_ERR PFX "Invalid directed route\n");
704 goto out;
705 }
de493d47 706
1da177e4 707 /* Check to post send on QP or process locally */
727792da
SW		 708 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
709 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
1da177e4
LT		 710 goto out;
711
712 local = kmalloc(sizeof *local, GFP_ATOMIC);
713 if (!local) {
714 ret = -ENOMEM;
715 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
716 goto out;
717 }
718 local->mad_priv = NULL;
719 local->recv_mad_agent = NULL;
720 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
721 if (!mad_priv) {
722 ret = -ENOMEM;
723 printk(KERN_ERR PFX "No memory for local response MAD\n");
724 kfree(local);
725 goto out;
726 }
727
062dbb69
MT		 728 build_smp_wc(mad_agent_priv->agent.qp,
729 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
97f52eb4 730 send_wr->wr.ud.pkey_index,
1da177e4
LT		 731 send_wr->wr.ud.port_num, &mad_wc);
732
733 /* No GRH for DR SMP */
734 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
735 (struct ib_mad *)smp,
736 (struct ib_mad *)&mad_priv->mad);
737 switch (ret)
738 {
739 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
2527e681 740 if (ib_response_mad(&mad_priv->mad.mad) &&
1da177e4
LT		 741 mad_agent_priv->agent.recv_handler) {
742 local->mad_priv = mad_priv;
743 local->recv_mad_agent = mad_agent_priv;
744 /*
745 * Reference MAD agent until receive
746 * side of local completion handled
747 */
748 atomic_inc(&mad_agent_priv->refcount);
749 } else
750 kmem_cache_free(ib_mad_cache, mad_priv);
751 break;
752 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
753 kmem_cache_free(ib_mad_cache, mad_priv);
4780c195 754 break;
1da177e4
LT		 755 case IB_MAD_RESULT_SUCCESS:
756 /* Treat like an incoming receive MAD */
1da177e4
LT		 757 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
758 mad_agent_priv->agent.port_num);
759 if (port_priv) {
727792da 760 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
1da177e4 761 recv_mad_agent = find_mad_agent(port_priv,
4a0754fa 762 &mad_priv->mad.mad);
1da177e4
LT		 763 }
764 if (!port_priv || !recv_mad_agent) {
4780c195
RC		 765 /*
766 * No receiving agent so drop packet and
767 * generate send completion.
768 */
1da177e4 769 kmem_cache_free(ib_mad_cache, mad_priv);
4780c195 770 break;
1da177e4
LT		 771 }
772 local->mad_priv = mad_priv;
773 local->recv_mad_agent = recv_mad_agent;
774 break;
775 default:
776 kmem_cache_free(ib_mad_cache, mad_priv);
777 kfree(local);
778 ret = -EINVAL;
779 goto out;
780 }
781
34816ad9 782 local->mad_send_wr = mad_send_wr;
1da177e4
LT		 783 /* Reference MAD agent until send side of local completion handled */
784 atomic_inc(&mad_agent_priv->refcount);
785 /* Queue local completion to local list */
786 spin_lock_irqsave(&mad_agent_priv->lock, flags);
787 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
788 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
789 queue_work(mad_agent_priv->qp_info->port_priv->wq,
b82cab6b 790 &mad_agent_priv->local_work);
1da177e4
LT		 791 ret = 1;
792out:
793 return ret;
794}
795
f36e1793 796static int get_pad_size(int hdr_len, int data_len)
824c8ae7
HR		 797{
798 int seg_size, pad;
799
800 seg_size = sizeof(struct ib_mad) - hdr_len;
801 if (data_len && seg_size) {
802 pad = seg_size - data_len % seg_size;
f36e1793 803 return pad == seg_size ? 0 : pad;
824c8ae7 804 } else
f36e1793
JM		 805 return seg_size;
806}
807
808static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
809{
810 struct ib_rmpp_segment *s, *t;
811
812 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
813 list_del(&s->list);
814 kfree(s);
815 }
816}
817
818static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
819 gfp_t gfp_mask)
820{
821 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
822 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
823 struct ib_rmpp_segment *seg = NULL;
824 int left, seg_size, pad;
825
826 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
827 seg_size = send_buf->seg_size;
828 pad = send_wr->pad;
829
830 /* Allocate data segments. */
831 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
832 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
833 if (!seg) {
834 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
835 "alloc failed for len %zd, gfp %#x\n",
836 sizeof (*seg) + seg_size, gfp_mask);
837 free_send_rmpp_list(send_wr);
838 return -ENOMEM;
839 }
840 seg->num = ++send_buf->seg_count;
841 list_add_tail(&seg->list, &send_wr->rmpp_list);
842 }
843
844 /* Zero any padding */
845 if (pad)
846 memset(seg->data + seg_size - pad, 0, pad);
847
848 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
849 agent.rmpp_version;
850 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
851 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
852
853 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
854 struct ib_rmpp_segment, list);
855 send_wr->last_ack_seg = send_wr->cur_seg;
856 return 0;
824c8ae7
HR		 857}
858
859struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
860 u32 remote_qpn, u16 pkey_index,
34816ad9 861 int rmpp_active,
824c8ae7 862 int hdr_len, int data_len,
dd0fc66f 863 gfp_t gfp_mask)
824c8ae7
HR		 864{
865 struct ib_mad_agent_private *mad_agent_priv;
34816ad9 866 struct ib_mad_send_wr_private *mad_send_wr;
f36e1793 867 int pad, message_size, ret, size;
824c8ae7
HR		 868 void *buf;
869
34816ad9
SH		 870 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
871 agent);
f36e1793
JM		 872 pad = get_pad_size(hdr_len, data_len);
873 message_size = hdr_len + data_len + pad;
824c8ae7 874
fa619a77 875 if ((!mad_agent->rmpp_version &&
f36e1793
JM		 876 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
877 (!rmpp_active && message_size > sizeof(struct ib_mad)))
fa619a77
HR		 878 return ERR_PTR(-EINVAL);
879
f36e1793
JM		 880 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
881 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
824c8ae7
HR		 882 if (!buf)
883 return ERR_PTR(-ENOMEM);
34816ad9 884
f36e1793
JM		 885 mad_send_wr = buf + size;
886 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
34816ad9 887 mad_send_wr->send_buf.mad = buf;
f36e1793
JM		 888 mad_send_wr->send_buf.hdr_len = hdr_len;
889 mad_send_wr->send_buf.data_len = data_len;
890 mad_send_wr->pad = pad;
34816ad9
SH		 891
892 mad_send_wr->mad_agent_priv = mad_agent_priv;
f36e1793 893 mad_send_wr->sg_list[0].length = hdr_len;
34816ad9 894 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
f36e1793
JM		 895 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
896 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
34816ad9
SH		 897
898 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
899 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
f36e1793 900 mad_send_wr->send_wr.num_sge = 2;
34816ad9
SH		 901 mad_send_wr->send_wr.opcode = IB_WR_SEND;
902 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
903 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
904 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
905 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
fa619a77
HR		 906
907 if (rmpp_active) {
f36e1793
JM		 908 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
909 if (ret) {
910 kfree(buf);
911 return ERR_PTR(ret);
912 }
fa619a77
HR		 913 }
914
34816ad9 915 mad_send_wr->send_buf.mad_agent = mad_agent;
824c8ae7 916 atomic_inc(&mad_agent_priv->refcount);
34816ad9 917 return &mad_send_wr->send_buf;
824c8ae7
HR		 918}
919EXPORT_SYMBOL(ib_create_send_mad);
920
618a3c03
HR		 921int ib_get_mad_data_offset(u8 mgmt_class)
922{
923 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
924 return IB_MGMT_SA_HDR;
925 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
926 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
927 (mgmt_class == IB_MGMT_CLASS_BIS))
928 return IB_MGMT_DEVICE_HDR;
929 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
930 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
931 return IB_MGMT_VENDOR_HDR;
932 else
933 return IB_MGMT_MAD_HDR;
934}
935EXPORT_SYMBOL(ib_get_mad_data_offset);
936
937int ib_is_mad_class_rmpp(u8 mgmt_class)
938{
939 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
940 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
941 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
942 (mgmt_class == IB_MGMT_CLASS_BIS) ||
943 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
944 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
945 return 1;
946 return 0;
947}
948EXPORT_SYMBOL(ib_is_mad_class_rmpp);
949
f36e1793
JM		 950void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
951{
952 struct ib_mad_send_wr_private *mad_send_wr;
953 struct list_head *list;
954
955 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
956 send_buf);
957 list = &mad_send_wr->cur_seg->list;
958
959 if (mad_send_wr->cur_seg->num < seg_num) {
960 list_for_each_entry(mad_send_wr->cur_seg, list, list)
961 if (mad_send_wr->cur_seg->num == seg_num)
962 break;
963 } else if (mad_send_wr->cur_seg->num > seg_num) {
964 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
965 if (mad_send_wr->cur_seg->num == seg_num)
966 break;
967 }
968 return mad_send_wr->cur_seg->data;
969}
970EXPORT_SYMBOL(ib_get_rmpp_segment);
971
972static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
973{
974 if (mad_send_wr->send_buf.seg_count)
975 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
976 mad_send_wr->seg_num);
977 else
978 return mad_send_wr->send_buf.mad +
979 mad_send_wr->send_buf.hdr_len;
980}
981
824c8ae7
HR		 982void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
983{
984 struct ib_mad_agent_private *mad_agent_priv;
f36e1793 985 struct ib_mad_send_wr_private *mad_send_wr;
824c8ae7
HR		 986
987 mad_agent_priv = container_of(send_buf->mad_agent,
988 struct ib_mad_agent_private, agent);
f36e1793
JM		 989 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
990 send_buf);
824c8ae7 991
f36e1793
JM		 992 free_send_rmpp_list(mad_send_wr);
993 kfree(send_buf->mad);
1b52fa98 994 deref_mad_agent(mad_agent_priv);
824c8ae7
HR		 995}
996EXPORT_SYMBOL(ib_free_send_mad);
997
fa619a77 998int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4
LT		 999{
1000 struct ib_mad_qp_info *qp_info;
cabe3cbc 1001 struct list_head *list;
34816ad9
SH		 1002 struct ib_send_wr *bad_send_wr;
1003 struct ib_mad_agent *mad_agent;
1004 struct ib_sge *sge;
1da177e4
LT		 1005 unsigned long flags;
1006 int ret;
1007
f8197a4e 1008 /* Set WR ID to find mad_send_wr upon completion */
d760ce8f 1009 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1da177e4
LT		 1010 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1011 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1012
34816ad9
SH		 1013 mad_agent = mad_send_wr->send_buf.mad_agent;
1014 sge = mad_send_wr->sg_list;
1527106f
RC		 1015 sge[0].addr = ib_dma_map_single(mad_agent->device,
1016 mad_send_wr->send_buf.mad,
1017 sge[0].length,
1018 DMA_TO_DEVICE);
1019 mad_send_wr->header_mapping = sge[0].addr;
1020
1021 sge[1].addr = ib_dma_map_single(mad_agent->device,
1022 ib_get_payload(mad_send_wr),
1023 sge[1].length,
1024 DMA_TO_DEVICE);
1025 mad_send_wr->payload_mapping = sge[1].addr;
34816ad9 1026
1da177e4 1027 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
cabe3cbc 1028 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
34816ad9
SH		 1029 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1030 &bad_send_wr);
cabe3cbc 1031 list = &qp_info->send_queue.list;
1da177e4 1032 } else {
1da177e4 1033 ret = 0;
cabe3cbc 1034 list = &qp_info->overflow_list;
1da177e4 1035 }
cabe3cbc
HR		 1036
1037 if (!ret) {
1038 qp_info->send_queue.count++;
1039 list_add_tail(&mad_send_wr->mad_list.list, list);
1040 }
1041 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
f36e1793 1042 if (ret) {
1527106f
RC		 1043 ib_dma_unmap_single(mad_agent->device,
1044 mad_send_wr->header_mapping,
1045 sge[0].length, DMA_TO_DEVICE);
1046 ib_dma_unmap_single(mad_agent->device,
1047 mad_send_wr->payload_mapping,
1048 sge[1].length, DMA_TO_DEVICE);
f36e1793 1049 }
1da177e4
LT		 1050 return ret;
1051}
1052
1053/*
1054 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1055 * with the registered client
1056 */
34816ad9
SH		 1057int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1058 struct ib_mad_send_buf **bad_send_buf)
1da177e4 1059{
1da177e4 1060 struct ib_mad_agent_private *mad_agent_priv;
34816ad9
SH		 1061 struct ib_mad_send_buf *next_send_buf;
1062 struct ib_mad_send_wr_private *mad_send_wr;
1063 unsigned long flags;
1064 int ret = -EINVAL;
1da177e4
LT		 1065
1066 /* Walk list of send WRs and post each on send list */
34816ad9 1067 for (; send_buf; send_buf = next_send_buf) {
1da177e4 1068
34816ad9
SH		 1069 mad_send_wr = container_of(send_buf,
1070 struct ib_mad_send_wr_private,
1071 send_buf);
1072 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4 1073
34816ad9
SH		 1074 if (!send_buf->mad_agent->send_handler ||
1075 (send_buf->timeout_ms &&
1076 !send_buf->mad_agent->recv_handler)) {
1077 ret = -EINVAL;
1078 goto error;
1da177e4
LT		 1079 }
1080
618a3c03
HR		 1081 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1082 if (mad_agent_priv->agent.rmpp_version) {
1083 ret = -EINVAL;
1084 goto error;
1085 }
1086 }
1087
1da177e4
LT		 1088 /*
1089 * Save pointer to next work request to post in case the
1090 * current one completes, and the user modifies the work
1091 * request associated with the completion
1092 */
34816ad9
SH		 1093 next_send_buf = send_buf->next;
1094 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1da177e4 1095
34816ad9
SH		 1096 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1097 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1098 ret = handle_outgoing_dr_smp(mad_agent_priv,
1099 mad_send_wr);
1da177e4 1100 if (ret < 0) /* error */
34816ad9 1101 goto error;
1da177e4 1102 else if (ret == 1) /* locally consumed */
34816ad9 1103 continue;
1da177e4
LT		 1104 }
1105
34816ad9 1106 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1da177e4 1107 /* Timeout will be updated after send completes */
34816ad9 1108 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
4fc8cd49
SH		 1109 mad_send_wr->max_retries = send_buf->retries;
1110 mad_send_wr->retries_left = send_buf->retries;
1111 send_buf->retries = 0;
34816ad9 1112 /* Reference for work request to QP + response */
1da177e4
LT		 1113 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1114 mad_send_wr->status = IB_WC_SUCCESS;
1115
1116 /* Reference MAD agent until send completes */
1117 atomic_inc(&mad_agent_priv->refcount);
1118 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1119 list_add_tail(&mad_send_wr->agent_list,
1120 &mad_agent_priv->send_list);
1121 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1122
fa619a77
HR		 1123 if (mad_agent_priv->agent.rmpp_version) {
1124 ret = ib_send_rmpp_mad(mad_send_wr);
1125 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1126 ret = ib_send_mad(mad_send_wr);
1127 } else
1128 ret = ib_send_mad(mad_send_wr);
1129 if (ret < 0) {
1da177e4
LT		 1130 /* Fail send request */
1131 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1132 list_del(&mad_send_wr->agent_list);
1133 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1134 atomic_dec(&mad_agent_priv->refcount);
34816ad9 1135 goto error;
1da177e4 1136 }
1da177e4
LT		 1137 }
1138 return 0;
34816ad9
SH		 1139error:
1140 if (bad_send_buf)
1141 *bad_send_buf = send_buf;
1da177e4
LT		 1142 return ret;
1143}
1144EXPORT_SYMBOL(ib_post_send_mad);
1145
1146/*
1147 * ib_free_recv_mad - Returns data buffers used to receive
1148 * a MAD to the access layer
1149 */
1150void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1151{
fa619a77 1152 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1da177e4
LT		 1153 struct ib_mad_private_header *mad_priv_hdr;
1154 struct ib_mad_private *priv;
fa619a77 1155 struct list_head free_list;
1da177e4 1156
fa619a77
HR		 1157 INIT_LIST_HEAD(&free_list);
1158 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1da177e4 1159
fa619a77
HR		 1160 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1161 &free_list, list) {
1162 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1163 recv_buf);
1da177e4
LT		 1164 mad_priv_hdr = container_of(mad_recv_wc,
1165 struct ib_mad_private_header,
1166 recv_wc);
1167 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1168 header);
fa619a77 1169 kmem_cache_free(ib_mad_cache, priv);
1da177e4 1170 }
1da177e4
LT		 1171}
1172EXPORT_SYMBOL(ib_free_recv_mad);
1173
1da177e4
LT		 1174struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1175 u8 rmpp_version,
1176 ib_mad_send_handler send_handler,
1177 ib_mad_recv_handler recv_handler,
1178 void *context)
1179{
1180 return ERR_PTR(-EINVAL); /* XXX: for now */
1181}
1182EXPORT_SYMBOL(ib_redirect_mad_qp);
1183
1184int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1185 struct ib_wc *wc)
1186{
1187 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1188 return 0;
1189}
1190EXPORT_SYMBOL(ib_process_mad_wc);
1191
1192static int method_in_use(struct ib_mad_mgmt_method_table **method,
1193 struct ib_mad_reg_req *mad_reg_req)
1194{
1195 int i;
1196
1197 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1198 i < IB_MGMT_MAX_METHODS;
1199 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1200 1+i)) {
1201 if ((*method)->agent[i]) {
1202 printk(KERN_ERR PFX "Method %d already in use\n", i);
1203 return -EINVAL;
1204 }
1205 }
1206 return 0;
1207}
1208
1209static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1210{
1211 /* Allocate management method table */
de6eb66b 1212 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1da177e4
LT		 1213 if (!*method) {
1214 printk(KERN_ERR PFX "No memory for "
1215 "ib_mad_mgmt_method_table\n");
1216 return -ENOMEM;
1217 }
1da177e4
LT		 1218
1219 return 0;
1220}
1221
1222/*
1223 * Check to see if there are any methods still in use
1224 */
1225static int check_method_table(struct ib_mad_mgmt_method_table *method)
1226{
1227 int i;
1228
1229 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1230 if (method->agent[i])
1231 return 1;
1232 return 0;
1233}
1234
1235/*
1236 * Check to see if there are any method tables for this class still in use
1237 */
1238static int check_class_table(struct ib_mad_mgmt_class_table *class)
1239{
1240 int i;
1241
1242 for (i = 0; i < MAX_MGMT_CLASS; i++)
1243 if (class->method_table[i])
1244 return 1;
1245 return 0;
1246}
1247
1248static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1249{
1250 int i;
1251
1252 for (i = 0; i < MAX_MGMT_OUI; i++)
1253 if (vendor_class->method_table[i])
1254 return 1;
1255 return 0;
1256}
1257
1258static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1259 char *oui)
1260{
1261 int i;
1262
1263 for (i = 0; i < MAX_MGMT_OUI; i++)
3cd96564
RD		 1264 /* Is there matching OUI for this vendor class ? */
1265 if (!memcmp(vendor_class->oui[i], oui, 3))
1da177e4
LT		 1266 return i;
1267
1268 return -1;
1269}
1270
1271static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1272{
1273 int i;
1274
1275 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1276 if (vendor->vendor_class[i])
1277 return 1;
1278
1279 return 0;
1280}
1281
1282static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1283 struct ib_mad_agent_private *agent)
1284{
1285 int i;
1286
1287 /* Remove any methods for this mad agent */
1288 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1289 if (method->agent[i] == agent) {
1290 method->agent[i] = NULL;
1291 }
1292 }
1293}
1294
1295static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1296 struct ib_mad_agent_private *agent_priv,
1297 u8 mgmt_class)
1298{
1299 struct ib_mad_port_private *port_priv;
1300 struct ib_mad_mgmt_class_table **class;
1301 struct ib_mad_mgmt_method_table **method;
1302 int i, ret;
1303
1304 port_priv = agent_priv->qp_info->port_priv;
1305 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1306 if (!*class) {
1307 /* Allocate management class table for "new" class version */
de6eb66b 1308 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1da177e4
LT		 1309 if (!*class) {
1310 printk(KERN_ERR PFX "No memory for "
1311 "ib_mad_mgmt_class_table\n");
1312 ret = -ENOMEM;
1313 goto error1;
1314 }
de6eb66b 1315
1da177e4
LT		 1316 /* Allocate method table for this management class */
1317 method = &(*class)->method_table[mgmt_class];
1318 if ((ret = allocate_method_table(method)))
1319 goto error2;
1320 } else {
1321 method = &(*class)->method_table[mgmt_class];
1322 if (!*method) {
1323 /* Allocate method table for this management class */
1324 if ((ret = allocate_method_table(method)))
1325 goto error1;
1326 }
1327 }
1328
1329 /* Now, make sure methods are not already in use */
1330 if (method_in_use(method, mad_reg_req))
1331 goto error3;
1332
1333 /* Finally, add in methods being registered */
1334 for (i = find_first_bit(mad_reg_req->method_mask,
1335 IB_MGMT_MAX_METHODS);
1336 i < IB_MGMT_MAX_METHODS;
1337 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1338 1+i)) {
1339 (*method)->agent[i] = agent_priv;
1340 }
1341 return 0;
1342
1343error3:
1344 /* Remove any methods for this mad agent */
1345 remove_methods_mad_agent(*method, agent_priv);
1346 /* Now, check to see if there are any methods in use */
1347 if (!check_method_table(*method)) {
1348 /* If not, release management method table */
1349 kfree(*method);
1350 *method = NULL;
1351 }
1352 ret = -EINVAL;
1353 goto error1;
1354error2:
1355 kfree(*class);
1356 *class = NULL;
1357error1:
1358 return ret;
1359}
1360
1361static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1362 struct ib_mad_agent_private *agent_priv)
1363{
1364 struct ib_mad_port_private *port_priv;
1365 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1366 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1367 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1368 struct ib_mad_mgmt_method_table **method;
1369 int i, ret = -ENOMEM;
1370 u8 vclass;
1371
1372 /* "New" vendor (with OUI) class */
1373 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1374 port_priv = agent_priv->qp_info->port_priv;
1375 vendor_table = &port_priv->version[
1376 mad_reg_req->mgmt_class_version].vendor;
1377 if (!*vendor_table) {
1378 /* Allocate mgmt vendor class table for "new" class version */
de6eb66b 1379 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1da177e4
LT		 1380 if (!vendor) {
1381 printk(KERN_ERR PFX "No memory for "
1382 "ib_mad_mgmt_vendor_class_table\n");
1383 goto error1;
1384 }
de6eb66b 1385
1da177e4
LT		 1386 *vendor_table = vendor;
1387 }
1388 if (!(*vendor_table)->vendor_class[vclass]) {
1389 /* Allocate table for this management vendor class */
de6eb66b 1390 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1da177e4
LT		 1391 if (!vendor_class) {
1392 printk(KERN_ERR PFX "No memory for "
1393 "ib_mad_mgmt_vendor_class\n");
1394 goto error2;
1395 }
de6eb66b 1396
1da177e4
LT		 1397 (*vendor_table)->vendor_class[vclass] = vendor_class;
1398 }
1399 for (i = 0; i < MAX_MGMT_OUI; i++) {
1400 /* Is there matching OUI for this vendor class ? */
1401 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1402 mad_reg_req->oui, 3)) {
1403 method = &(*vendor_table)->vendor_class[
1404 vclass]->method_table[i];
1405 BUG_ON(!*method);
1406 goto check_in_use;
1407 }
1408 }
1409 for (i = 0; i < MAX_MGMT_OUI; i++) {
1410 /* OUI slot available ? */
1411 if (!is_vendor_oui((*vendor_table)->vendor_class[
1412 vclass]->oui[i])) {
1413 method = &(*vendor_table)->vendor_class[
1414 vclass]->method_table[i];
1415 BUG_ON(*method);
1416 /* Allocate method table for this OUI */
1417 if ((ret = allocate_method_table(method)))
1418 goto error3;
1419 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1420 mad_reg_req->oui, 3);
1421 goto check_in_use;
1422 }
1423 }
1424 printk(KERN_ERR PFX "All OUI slots in use\n");
1425 goto error3;
1426
1427check_in_use:
1428 /* Now, make sure methods are not already in use */
1429 if (method_in_use(method, mad_reg_req))
1430 goto error4;
1431
1432 /* Finally, add in methods being registered */
1433 for (i = find_first_bit(mad_reg_req->method_mask,
1434 IB_MGMT_MAX_METHODS);
1435 i < IB_MGMT_MAX_METHODS;
1436 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1437 1+i)) {
1438 (*method)->agent[i] = agent_priv;
1439 }
1440 return 0;
1441
1442error4:
1443 /* Remove any methods for this mad agent */
1444 remove_methods_mad_agent(*method, agent_priv);
1445 /* Now, check to see if there are any methods in use */
1446 if (!check_method_table(*method)) {
1447 /* If not, release management method table */
1448 kfree(*method);
1449 *method = NULL;
1450 }
1451 ret = -EINVAL;
1452error3:
1453 if (vendor_class) {
1454 (*vendor_table)->vendor_class[vclass] = NULL;
1455 kfree(vendor_class);
1456 }
1457error2:
1458 if (vendor) {
1459 *vendor_table = NULL;
1460 kfree(vendor);
1461 }
1462error1:
1463 return ret;
1464}
1465
1466static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1467{
1468 struct ib_mad_port_private *port_priv;
1469 struct ib_mad_mgmt_class_table *class;
1470 struct ib_mad_mgmt_method_table *method;
1471 struct ib_mad_mgmt_vendor_class_table *vendor;
1472 struct ib_mad_mgmt_vendor_class *vendor_class;
1473 int index;
1474 u8 mgmt_class;
1475
1476 /*
1477 * Was MAD registration request supplied
1478 * with original registration ?
1479 */
1480 if (!agent_priv->reg_req) {
1481 goto out;
1482 }
1483
1484 port_priv = agent_priv->qp_info->port_priv;
1485 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1486 class = port_priv->version[
1487 agent_priv->reg_req->mgmt_class_version].class;
1488 if (!class)
1489 goto vendor_check;
1490
1491 method = class->method_table[mgmt_class];
1492 if (method) {
1493 /* Remove any methods for this mad agent */
1494 remove_methods_mad_agent(method, agent_priv);
1495 /* Now, check to see if there are any methods still in use */
1496 if (!check_method_table(method)) {
1497 /* If not, release management method table */
1498 kfree(method);
1499 class->method_table[mgmt_class] = NULL;
1500 /* Any management classes left ? */
1501 if (!check_class_table(class)) {
1502 /* If not, release management class table */
1503 kfree(class);
1504 port_priv->version[
1505 agent_priv->reg_req->
1506 mgmt_class_version].class = NULL;
1507 }
1508 }
1509 }
1510
1511vendor_check:
1512 if (!is_vendor_class(mgmt_class))
1513 goto out;
1514
1515 /* normalize mgmt_class to vendor range 2 */
1516 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1517 vendor = port_priv->version[
1518 agent_priv->reg_req->mgmt_class_version].vendor;
1519
1520 if (!vendor)
1521 goto out;
1522
1523 vendor_class = vendor->vendor_class[mgmt_class];
1524 if (vendor_class) {
1525 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1526 if (index < 0)
1527 goto out;
1528 method = vendor_class->method_table[index];
1529 if (method) {
1530 /* Remove any methods for this mad agent */
1531 remove_methods_mad_agent(method, agent_priv);
1532 /*
1533 * Now, check to see if there are
1534 * any methods still in use
1535 */
1536 if (!check_method_table(method)) {
1537 /* If not, release management method table */
1538 kfree(method);
1539 vendor_class->method_table[index] = NULL;
1540 memset(vendor_class->oui[index], 0, 3);
1541 /* Any OUIs left ? */
1542 if (!check_vendor_class(vendor_class)) {
1543 /* If not, release vendor class table */
1544 kfree(vendor_class);
1545 vendor->vendor_class[mgmt_class] = NULL;
1546 /* Any other vendor classes left ? */
1547 if (!check_vendor_table(vendor)) {
1548 kfree(vendor);
1549 port_priv->version[
1550 agent_priv->reg_req->
1551 mgmt_class_version].
1552 vendor = NULL;
1553 }
1554 }
1555 }
1556 }
1557 }
1558
1559out:
1560 return;
1561}
1562
1da177e4
LT		 1563static struct ib_mad_agent_private *
1564find_mad_agent(struct ib_mad_port_private *port_priv,
4a0754fa 1565 struct ib_mad *mad)
1da177e4
LT		 1566{
1567 struct ib_mad_agent_private *mad_agent = NULL;
1568 unsigned long flags;
1569
1570 spin_lock_irqsave(&port_priv->reg_lock, flags);
2527e681 1571 if (ib_response_mad(mad)) {
1da177e4
LT		 1572 u32 hi_tid;
1573 struct ib_mad_agent_private *entry;
1574
1575 /*
1576 * Routing is based on high 32 bits of transaction ID
1577 * of MAD.
1578 */
1579 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
34816ad9 1580 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1da177e4
LT		 1581 if (entry->agent.hi_tid == hi_tid) {
1582 mad_agent = entry;
1583 break;
1584 }
1585 }
1586 } else {
1587 struct ib_mad_mgmt_class_table *class;
1588 struct ib_mad_mgmt_method_table *method;
1589 struct ib_mad_mgmt_vendor_class_table *vendor;
1590 struct ib_mad_mgmt_vendor_class *vendor_class;
1591 struct ib_vendor_mad *vendor_mad;
1592 int index;
1593
1594 /*
1595 * Routing is based on version, class, and method
1596 * For "newer" vendor MADs, also based on OUI
1597 */
1598 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1599 goto out;
1600 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1601 class = port_priv->version[
1602 mad->mad_hdr.class_version].class;
1603 if (!class)
1604 goto out;
1605 method = class->method_table[convert_mgmt_class(
1606 mad->mad_hdr.mgmt_class)];
1607 if (method)
1608 mad_agent = method->agent[mad->mad_hdr.method &
1609 ~IB_MGMT_METHOD_RESP];
1610 } else {
1611 vendor = port_priv->version[
1612 mad->mad_hdr.class_version].vendor;
1613 if (!vendor)
1614 goto out;
1615 vendor_class = vendor->vendor_class[vendor_class_index(
1616 mad->mad_hdr.mgmt_class)];
1617 if (!vendor_class)
1618 goto out;
1619 /* Find matching OUI */
1620 vendor_mad = (struct ib_vendor_mad *)mad;
1621 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1622 if (index == -1)
1623 goto out;
1624 method = vendor_class->method_table[index];
1625 if (method) {
1626 mad_agent = method->agent[mad->mad_hdr.method &
1627 ~IB_MGMT_METHOD_RESP];
1628 }
1629 }
1630 }
1631
1632 if (mad_agent) {
1633 if (mad_agent->agent.recv_handler)
1634 atomic_inc(&mad_agent->refcount);
1635 else {
1636 printk(KERN_NOTICE PFX "No receive handler for client "
1637 "%p on port %d\n",
1638 &mad_agent->agent, port_priv->port_num);
1639 mad_agent = NULL;
1640 }
1641 }
1642out:
1643 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1644
1645 return mad_agent;
1646}
1647
1648static int validate_mad(struct ib_mad *mad, u32 qp_num)
1649{
1650 int valid = 0;
1651
1652 /* Make sure MAD base version is understood */
1653 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1654 printk(KERN_ERR PFX "MAD received with unsupported base "
1655 "version %d\n", mad->mad_hdr.base_version);
1656 goto out;
1657 }
1658
1659 /* Filter SMI packets sent to other than QP0 */
1660 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1661 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1662 if (qp_num == 0)
1663 valid = 1;
1664 } else {
1665 /* Filter GSI packets sent to QP0 */
1666 if (qp_num != 0)
1667 valid = 1;
1668 }
1669
1670out:
1671 return valid;
1672}
1673
fa619a77
HR		 1674static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1675 struct ib_mad_hdr *mad_hdr)
1676{
1677 struct ib_rmpp_mad *rmpp_mad;
1678
1679 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1680 return !mad_agent_priv->agent.rmpp_version ||
1681 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1682 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1683 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1684}
1685
fa9656bb
JM		 1686static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1687 struct ib_mad_recv_wc *rwc)
1688{
1689 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1690 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1691}
1692
9874e746
JM		 1693static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1694 struct ib_mad_send_wr_private *wr,
fa9656bb
JM		 1695 struct ib_mad_recv_wc *rwc )
1696{
1697 struct ib_ah_attr attr;
1698 u8 send_resp, rcv_resp;
9874e746
JM		 1699 union ib_gid sgid;
1700 struct ib_device *device = mad_agent_priv->agent.device;
1701 u8 port_num = mad_agent_priv->agent.port_num;
1702 u8 lmc;
fa9656bb 1703
7097228c
MB		 1704 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1705 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
fa9656bb 1706
fa9656bb
JM		 1707 if (send_resp == rcv_resp)
1708 /* both requests, or both responses. GIDs different */
1709 return 0;
1710
1711 if (ib_query_ah(wr->send_buf.ah, &attr))
1712 /* Assume not equal, to avoid false positives. */
1713 return 0;
1714
9874e746
JM		 1715 if (!!(attr.ah_flags & IB_AH_GRH) !=
1716 !!(rwc->wc->wc_flags & IB_WC_GRH))
fa9656bb
JM		 1717 /* one has GID, other does not. Assume different */
1718 return 0;
9874e746
JM		 1719
1720 if (!send_resp && rcv_resp) {
1721 /* is request/response. */
1722 if (!(attr.ah_flags & IB_AH_GRH)) {
1723 if (ib_get_cached_lmc(device, port_num, &lmc))
1724 return 0;
1725 return (!lmc || !((attr.src_path_bits ^
1726 rwc->wc->dlid_path_bits) &
1727 ((1 << lmc) - 1)));
1728 } else {
1729 if (ib_get_cached_gid(device, port_num,
1730 attr.grh.sgid_index, &sgid))
1731 return 0;
1732 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1733 16);
1734 }
1735 }
1736
1737 if (!(attr.ah_flags & IB_AH_GRH))
1738 return attr.dlid == rwc->wc->slid;
1739 else
1740 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1741 16);
1742}
1743
1744static inline int is_direct(u8 class)
1745{
1746 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
fa9656bb 1747}
9874e746 1748
fa619a77 1749struct ib_mad_send_wr_private*
fa9656bb 1750ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
9874e746 1751 struct ib_mad_recv_wc *wc)
1da177e4 1752{
9874e746 1753 struct ib_mad_send_wr_private *wr;
fa9656bb
JM		 1754 struct ib_mad *mad;
1755
9874e746
JM		 1756 mad = (struct ib_mad *)wc->recv_buf.mad;
1757
1758 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1759 if ((wr->tid == mad->mad_hdr.tid) &&
1760 rcv_has_same_class(wr, wc) &&
1761 /*
1762 * Don't check GID for direct routed MADs.
1763 * These might have permissive LIDs.
1764 */
1765 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1766 rcv_has_same_gid(mad_agent_priv, wr, wc)))
39798695 1767 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1da177e4
LT		 1768 }
1769
1770 /*
1771 * It's possible to receive the response before we've
1772 * been notified that the send has completed
1773 */
9874e746
JM		 1774 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1775 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1776 wr->tid == mad->mad_hdr.tid &&
1777 wr->timeout &&
1778 rcv_has_same_class(wr, wc) &&
1779 /*
1780 * Don't check GID for direct routed MADs.
1781 * These might have permissive LIDs.
1782 */
1783 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1784 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1da177e4 1785 /* Verify request has not been canceled */
9874e746 1786 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1da177e4
LT		 1787 }
1788 return NULL;
1789}
1790
fa619a77 1791void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
6a0c435e
HR		 1792{
1793 mad_send_wr->timeout = 0;
179e0917
AM		 1794 if (mad_send_wr->refcount == 1)
1795 list_move_tail(&mad_send_wr->agent_list,
6a0c435e 1796 &mad_send_wr->mad_agent_priv->done_list);
6a0c435e
HR		 1797}
1798
1da177e4 1799static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
4a0754fa 1800 struct ib_mad_recv_wc *mad_recv_wc)
1da177e4
LT		 1801{
1802 struct ib_mad_send_wr_private *mad_send_wr;
1803 struct ib_mad_send_wc mad_send_wc;
1804 unsigned long flags;
1805
fa619a77
HR		 1806 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1807 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1808 if (mad_agent_priv->agent.rmpp_version) {
1809 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1810 mad_recv_wc);
1811 if (!mad_recv_wc) {
1b52fa98 1812 deref_mad_agent(mad_agent_priv);
fa619a77
HR		 1813 return;
1814 }
1815 }
1816
1da177e4 1817 /* Complete corresponding request */
2527e681 1818 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1da177e4 1819 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa9656bb 1820 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1da177e4
LT		 1821 if (!mad_send_wr) {
1822 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
4a0754fa 1823 ib_free_recv_mad(mad_recv_wc);
1b52fa98 1824 deref_mad_agent(mad_agent_priv);
1da177e4
LT		 1825 return;
1826 }
fa619a77 1827 ib_mark_mad_done(mad_send_wr);
1da177e4
LT		 1828 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1829
1830 /* Defined behavior is to complete response before request */
34816ad9 1831 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
4a0754fa
HR		 1832 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1833 mad_recv_wc);
1da177e4
LT		 1834 atomic_dec(&mad_agent_priv->refcount);
1835
1836 mad_send_wc.status = IB_WC_SUCCESS;
1837 mad_send_wc.vendor_err = 0;
34816ad9 1838 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1da177e4
LT		 1839 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1840 } else {
4a0754fa
HR		 1841 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1842 mad_recv_wc);
1b52fa98 1843 deref_mad_agent(mad_agent_priv);
1da177e4
LT		 1844 }
1845}
1846
1847static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1848 struct ib_wc *wc)
1849{
1850 struct ib_mad_qp_info *qp_info;
1851 struct ib_mad_private_header *mad_priv_hdr;
445d6807 1852 struct ib_mad_private *recv, *response = NULL;
1da177e4
LT		 1853 struct ib_mad_list_head *mad_list;
1854 struct ib_mad_agent_private *mad_agent;
1bae4dbf 1855 int port_num;
1da177e4 1856
1da177e4
LT		 1857 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1858 qp_info = mad_list->mad_queue->qp_info;
1859 dequeue_mad(mad_list);
1860
1861 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1862 mad_list);
1863 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1527106f
RC		 1864 ib_dma_unmap_single(port_priv->device,
1865 recv->header.mapping,
1866 sizeof(struct ib_mad_private) -
1867 sizeof(struct ib_mad_private_header),
1868 DMA_FROM_DEVICE);
1da177e4
LT		 1869
1870 /* Setup MAD receive work completion from "normal" work completion */
24239aff
SH		 1871 recv->header.wc = *wc;
1872 recv->header.recv_wc.wc = &recv->header.wc;
1da177e4
LT		 1873 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1874 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1875 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1876
1877 if (atomic_read(&qp_info->snoop_count))
1878 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1879
1880 /* Validate MAD */
1881 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1882 goto out;
1883
445d6807
HR		 1884 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1885 if (!response) {
1886 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1887 "for response buffer\n");
1888 goto out;
1889 }
1890
1bae4dbf
HR		 1891 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1892 port_num = wc->port_num;
1893 else
1894 port_num = port_priv->port_num;
1895
1da177e4
LT		 1896 if (recv->mad.mad.mad_hdr.mgmt_class ==
1897 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1bae4dbf
HR		 1898 enum smi_forward_action retsmi;
1899
de493d47
HR		 1900 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1901 port_priv->device->node_type,
1bae4dbf 1902 port_num,
de493d47
HR		 1903 port_priv->device->phys_port_cnt) ==
1904 IB_SMI_DISCARD)
1da177e4 1905 goto out;
de493d47 1906
1bae4dbf
HR		 1907 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1908 if (retsmi == IB_SMI_LOCAL)
1da177e4 1909 goto local;
de493d47 1910
1bae4dbf
HR		 1911 if (retsmi == IB_SMI_SEND) { /* don't forward */
1912 if (smi_handle_dr_smp_send(&recv->mad.smp,
1913 port_priv->device->node_type,
1914 port_num) == IB_SMI_DISCARD)
1915 goto out;
1916
1917 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1918 goto out;
1919 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1920 /* forward case for switches */
1921 memcpy(response, recv, sizeof(*response));
1922 response->header.recv_wc.wc = &response->header.wc;
1923 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1924 response->header.recv_wc.recv_buf.grh = &response->grh;
1925
86dfbecd
HR		 1926 agent_send_response(&response->mad.mad,
1927 &response->grh, wc,
1928 port_priv->device,
1929 smi_get_fwd_port(&recv->mad.smp),
1930 qp_info->qp->qp_num);
de493d47 1931
1da177e4 1932 goto out;
1bae4dbf 1933 }
1da177e4
LT		 1934 }
1935
1936local:
1937 /* Give driver "right of first refusal" on incoming MAD */
1938 if (port_priv->device->process_mad) {
1939 int ret;
1940
1da177e4
LT		 1941 ret = port_priv->device->process_mad(port_priv->device, 0,
1942 port_priv->port_num,
1943 wc, &recv->grh,
1944 &recv->mad.mad,
1945 &response->mad.mad);
1946 if (ret & IB_MAD_RESULT_SUCCESS) {
1947 if (ret & IB_MAD_RESULT_CONSUMED)
1948 goto out;
1949 if (ret & IB_MAD_RESULT_REPLY) {
34816ad9
SH		 1950 agent_send_response(&response->mad.mad,
1951 &recv->grh, wc,
1952 port_priv->device,
1bae4dbf 1953 port_num,
34816ad9 1954 qp_info->qp->qp_num);
1da177e4
LT		 1955 goto out;
1956 }
1957 }
1958 }
1959
4a0754fa 1960 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1da177e4 1961 if (mad_agent) {
4a0754fa 1962 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1da177e4
LT		 1963 /*
1964 * recv is freed up in error cases in ib_mad_complete_recv
1965 * or via recv_handler in ib_mad_complete_recv()
1966 */
1967 recv = NULL;
1968 }
1969
1970out:
1971 /* Post another receive request for this QP */
1972 if (response) {
1973 ib_mad_post_receive_mads(qp_info, response);
1974 if (recv)
1975 kmem_cache_free(ib_mad_cache, recv);
1976 } else
1977 ib_mad_post_receive_mads(qp_info, recv);
1978}
1979
1980static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1981{
1982 struct ib_mad_send_wr_private *mad_send_wr;
1983 unsigned long delay;
1984
1985 if (list_empty(&mad_agent_priv->wait_list)) {
6b2eef8f 1986 __cancel_delayed_work(&mad_agent_priv->timed_work);
1da177e4
LT		 1987 } else {
1988 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1989 struct ib_mad_send_wr_private,
1990 agent_list);
1991
1992 if (time_after(mad_agent_priv->timeout,
1993 mad_send_wr->timeout)) {
1994 mad_agent_priv->timeout = mad_send_wr->timeout;
6b2eef8f 1995 __cancel_delayed_work(&mad_agent_priv->timed_work);
1da177e4
LT		 1996 delay = mad_send_wr->timeout - jiffies;
1997 if ((long)delay <= 0)
1998 delay = 1;
1999 queue_delayed_work(mad_agent_priv->qp_info->
2000 port_priv->wq,
2001 &mad_agent_priv->timed_work, delay);
2002 }
2003 }
2004}
2005
d760ce8f 2006static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1da177e4 2007{
d760ce8f 2008 struct ib_mad_agent_private *mad_agent_priv;
1da177e4
LT		 2009 struct ib_mad_send_wr_private *temp_mad_send_wr;
2010 struct list_head *list_item;
2011 unsigned long delay;
2012
d760ce8f 2013 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4
LT		 2014 list_del(&mad_send_wr->agent_list);
2015
2016 delay = mad_send_wr->timeout;
2017 mad_send_wr->timeout += jiffies;
2018
29bb33dd
HR		 2019 if (delay) {
2020 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2021 temp_mad_send_wr = list_entry(list_item,
2022 struct ib_mad_send_wr_private,
2023 agent_list);
2024 if (time_after(mad_send_wr->timeout,
2025 temp_mad_send_wr->timeout))
2026 break;
2027 }
1da177e4 2028 }
29bb33dd
HR		 2029 else
2030 list_item = &mad_agent_priv->wait_list;
1da177e4
LT		 2031 list_add(&mad_send_wr->agent_list, list_item);
2032
2033 /* Reschedule a work item if we have a shorter timeout */
2034 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
6b2eef8f 2035 __cancel_delayed_work(&mad_agent_priv->timed_work);
1da177e4
LT		 2036 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2037 &mad_agent_priv->timed_work, delay);
2038 }
2039}
2040
03b61ad2
HR		 2041void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2042 int timeout_ms)
2043{
2044 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2045 wait_for_response(mad_send_wr);
2046}
2047
1da177e4
LT		 2048/*
2049 * Process a send work completion
2050 */
fa619a77
HR		 2051void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2052 struct ib_mad_send_wc *mad_send_wc)
1da177e4
LT		 2053{
2054 struct ib_mad_agent_private *mad_agent_priv;
2055 unsigned long flags;
fa619a77 2056 int ret;
1da177e4 2057
d760ce8f 2058 mad_agent_priv = mad_send_wr->mad_agent_priv;
1da177e4 2059 spin_lock_irqsave(&mad_agent_priv->lock, flags);
fa619a77
HR		 2060 if (mad_agent_priv->agent.rmpp_version) {
2061 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2062 if (ret == IB_RMPP_RESULT_CONSUMED)
2063 goto done;
2064 } else
2065 ret = IB_RMPP_RESULT_UNHANDLED;
2066
1da177e4
LT		 2067 if (mad_send_wc->status != IB_WC_SUCCESS &&
2068 mad_send_wr->status == IB_WC_SUCCESS) {
2069 mad_send_wr->status = mad_send_wc->status;
2070 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2071 }
2072
2073 if (--mad_send_wr->refcount > 0) {
2074 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2075 mad_send_wr->status == IB_WC_SUCCESS) {
d760ce8f 2076 wait_for_response(mad_send_wr);
1da177e4 2077 }
fa619a77 2078 goto done;
1da177e4
LT		 2079 }
2080
2081 /* Remove send from MAD agent and notify client of completion */
2082 list_del(&mad_send_wr->agent_list);
2083 adjust_timeout(mad_agent_priv);
2084 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2085
2086 if (mad_send_wr->status != IB_WC_SUCCESS )
2087 mad_send_wc->status = mad_send_wr->status;
34816ad9
SH		 2088 if (ret == IB_RMPP_RESULT_INTERNAL)
2089 ib_rmpp_send_handler(mad_send_wc);
2090 else
fa619a77
HR		 2091 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2092 mad_send_wc);
1da177e4
LT		 2093
2094 /* Release reference on agent taken when sending */
1b52fa98 2095 deref_mad_agent(mad_agent_priv);
fa619a77
HR		 2096 return;
2097done:
2098 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1da177e4
LT		 2099}
2100
2101static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2102 struct ib_wc *wc)
2103{
2104 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2105 struct ib_mad_list_head *mad_list;
2106 struct ib_mad_qp_info *qp_info;
2107 struct ib_mad_queue *send_queue;
2108 struct ib_send_wr *bad_send_wr;
34816ad9 2109 struct ib_mad_send_wc mad_send_wc;
1da177e4
LT		 2110 unsigned long flags;
2111 int ret;
2112
2113 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2114 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2115 mad_list);
2116 send_queue = mad_list->mad_queue;
2117 qp_info = send_queue->qp_info;
2118
2119retry:
1527106f
RC		 2120 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2121 mad_send_wr->header_mapping,
2122 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2123 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2124 mad_send_wr->payload_mapping,
2125 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
1da177e4
LT		 2126 queued_send_wr = NULL;
2127 spin_lock_irqsave(&send_queue->lock, flags);
2128 list_del(&mad_list->list);
2129
2130 /* Move queued send to the send queue */
2131 if (send_queue->count-- > send_queue->max_active) {
2132 mad_list = container_of(qp_info->overflow_list.next,
2133 struct ib_mad_list_head, list);
2134 queued_send_wr = container_of(mad_list,
2135 struct ib_mad_send_wr_private,
2136 mad_list);
179e0917 2137 list_move_tail(&mad_list->list, &send_queue->list);
1da177e4
LT		 2138 }
2139 spin_unlock_irqrestore(&send_queue->lock, flags);
2140
34816ad9
SH		 2141 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2142 mad_send_wc.status = wc->status;
2143 mad_send_wc.vendor_err = wc->vendor_err;
1da177e4 2144 if (atomic_read(&qp_info->snoop_count))
34816ad9 2145 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
1da177e4 2146 IB_MAD_SNOOP_SEND_COMPLETIONS);
34816ad9 2147 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1da177e4
LT		 2148
2149 if (queued_send_wr) {
2150 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
34816ad9 2151 &bad_send_wr);
1da177e4
LT		 2152 if (ret) {
2153 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2154 mad_send_wr = queued_send_wr;
2155 wc->status = IB_WC_LOC_QP_OP_ERR;
2156 goto retry;
2157 }
2158 }
2159}
2160
2161static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2162{
2163 struct ib_mad_send_wr_private *mad_send_wr;
2164 struct ib_mad_list_head *mad_list;
2165 unsigned long flags;
2166
2167 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2168 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2169 mad_send_wr = container_of(mad_list,
2170 struct ib_mad_send_wr_private,
2171 mad_list);
2172 mad_send_wr->retry = 1;
2173 }
2174 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2175}
2176
2177static void mad_error_handler(struct ib_mad_port_private *port_priv,
2178 struct ib_wc *wc)
2179{
2180 struct ib_mad_list_head *mad_list;
2181 struct ib_mad_qp_info *qp_info;
2182 struct ib_mad_send_wr_private *mad_send_wr;
2183 int ret;
2184
2185 /* Determine if failure was a send or receive */
2186 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2187 qp_info = mad_list->mad_queue->qp_info;
2188 if (mad_list->mad_queue == &qp_info->recv_queue)
2189 /*
2190 * Receive errors indicate that the QP has entered the error
2191 * state - error handling/shutdown code will cleanup
2192 */
2193 return;
2194
2195 /*
2196 * Send errors will transition the QP to SQE - move
2197 * QP to RTS and repost flushed work requests
2198 */
2199 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2200 mad_list);
2201 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2202 if (mad_send_wr->retry) {
2203 /* Repost send */
2204 struct ib_send_wr *bad_send_wr;
2205
2206 mad_send_wr->retry = 0;
2207 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2208 &bad_send_wr);
2209 if (ret)
2210 ib_mad_send_done_handler(port_priv, wc);
2211 } else
2212 ib_mad_send_done_handler(port_priv, wc);
2213 } else {
2214 struct ib_qp_attr *attr;
2215
2216 /* Transition QP to RTS and fail offending send */
2217 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2218 if (attr) {
2219 attr->qp_state = IB_QPS_RTS;
2220 attr->cur_qp_state = IB_QPS_SQE;
2221 ret = ib_modify_qp(qp_info->qp, attr,
2222 IB_QP_STATE | IB_QP_CUR_STATE);
2223 kfree(attr);
2224 if (ret)
2225 printk(KERN_ERR PFX "mad_error_handler - "
2226 "ib_modify_qp to RTS : %d\n", ret);
2227 else
2228 mark_sends_for_retry(qp_info);
2229 }
2230 ib_mad_send_done_handler(port_priv, wc);
2231 }
2232}
2233
2234/*
2235 * IB MAD completion callback
2236 */
c4028958 2237static void ib_mad_completion_handler(struct work_struct *work)
1da177e4
LT		 2238{
2239 struct ib_mad_port_private *port_priv;
2240 struct ib_wc wc;
2241
c4028958 2242 port_priv = container_of(work, struct ib_mad_port_private, work);
1da177e4
LT		 2243 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2244
2245 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2246 if (wc.status == IB_WC_SUCCESS) {
2247 switch (wc.opcode) {
2248 case IB_WC_SEND:
2249 ib_mad_send_done_handler(port_priv, &wc);
2250 break;
2251 case IB_WC_RECV:
2252 ib_mad_recv_done_handler(port_priv, &wc);
2253 break;
2254 default:
2255 BUG_ON(1);
2256 break;
2257 }
2258 } else
2259 mad_error_handler(port_priv, &wc);
2260 }
2261}
2262
2263static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2264{
2265 unsigned long flags;
2266 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2267 struct ib_mad_send_wc mad_send_wc;
2268 struct list_head cancel_list;
2269
2270 INIT_LIST_HEAD(&cancel_list);
2271
2272 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2273 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2274 &mad_agent_priv->send_list, agent_list) {
2275 if (mad_send_wr->status == IB_WC_SUCCESS) {
3cd96564 2276 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
1da177e4
LT		 2277 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2278 }
2279 }
2280
2281 /* Empty wait list to prevent receives from finding a request */
2282 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2283 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2284
2285 /* Report all cancelled requests */
2286 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2287 mad_send_wc.vendor_err = 0;
2288
2289 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2290 &cancel_list, agent_list) {
34816ad9
SH		 2291 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2292 list_del(&mad_send_wr->agent_list);
1da177e4
LT		 2293 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2294 &mad_send_wc);
1da177e4
LT		 2295 atomic_dec(&mad_agent_priv->refcount);
2296 }
2297}
2298
2299static struct ib_mad_send_wr_private*
34816ad9
SH		 2300find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2301 struct ib_mad_send_buf *send_buf)
1da177e4
LT		 2302{
2303 struct ib_mad_send_wr_private *mad_send_wr;
2304
2305 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2306 agent_list) {
34816ad9 2307 if (&mad_send_wr->send_buf == send_buf)
1da177e4
LT		 2308 return mad_send_wr;
2309 }
2310
2311 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2312 agent_list) {
34816ad9
SH		 2313 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2314 &mad_send_wr->send_buf == send_buf)
1da177e4
LT		 2315 return mad_send_wr;
2316 }
2317 return NULL;
2318}
2319
34816ad9
SH		 2320int ib_modify_mad(struct ib_mad_agent *mad_agent,
2321 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
1da177e4
LT		 2322{
2323 struct ib_mad_agent_private *mad_agent_priv;
2324 struct ib_mad_send_wr_private *mad_send_wr;
2325 unsigned long flags;
cabe3cbc 2326 int active;
1da177e4
LT		 2327
2328 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2329 agent);
2330 spin_lock_irqsave(&mad_agent_priv->lock, flags);
34816ad9 2331 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
03b61ad2 2332 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
1da177e4 2333 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2 2334 return -EINVAL;
1da177e4
LT		 2335 }
2336
cabe3cbc 2337 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
03b61ad2 2338 if (!timeout_ms) {
1da177e4 2339 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
03b61ad2 2340 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1da177e4
LT		 2341 }
2342
34816ad9 2343 mad_send_wr->send_buf.timeout_ms = timeout_ms;
cabe3cbc 2344 if (active)
03b61ad2
HR		 2345 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2346 else
2347 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2348
1da177e4 2349 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
03b61ad2
HR		 2350 return 0;
2351}
2352EXPORT_SYMBOL(ib_modify_mad);
1da177e4 2353
34816ad9
SH		 2354void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2355 struct ib_mad_send_buf *send_buf)
03b61ad2 2356{
34816ad9 2357 ib_modify_mad(mad_agent, send_buf, 0);
1da177e4
LT		 2358}
2359EXPORT_SYMBOL(ib_cancel_mad);
2360
c4028958 2361static void local_completions(struct work_struct *work)
1da177e4
LT		 2362{
2363 struct ib_mad_agent_private *mad_agent_priv;
2364 struct ib_mad_local_private *local;
2365 struct ib_mad_agent_private *recv_mad_agent;
2366 unsigned long flags;
1d9bc6d6 2367 int free_mad;
1da177e4
LT		 2368 struct ib_wc wc;
2369 struct ib_mad_send_wc mad_send_wc;
2370
c4028958
DH		 2371 mad_agent_priv =
2372 container_of(work, struct ib_mad_agent_private, local_work);
1da177e4
LT		 2373
2374 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2375 while (!list_empty(&mad_agent_priv->local_list)) {
2376 local = list_entry(mad_agent_priv->local_list.next,
2377 struct ib_mad_local_private,
2378 completion_list);
37289efe 2379 list_del(&local->completion_list);
1da177e4 2380 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1d9bc6d6 2381 free_mad = 0;
1da177e4
LT		 2382 if (local->mad_priv) {
2383 recv_mad_agent = local->recv_mad_agent;
2384 if (!recv_mad_agent) {
2385 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
1d9bc6d6 2386 free_mad = 1;
1da177e4
LT		 2387 goto local_send_completion;
2388 }
2389
2390 /*
2391 * Defined behavior is to complete response
2392 * before request
2393 */
062dbb69
MT		 2394 build_smp_wc(recv_mad_agent->agent.qp,
2395 (unsigned long) local->mad_send_wr,
97f52eb4 2396 be16_to_cpu(IB_LID_PERMISSIVE),
34816ad9 2397 0, recv_mad_agent->agent.port_num, &wc);
1da177e4
LT		 2398
2399 local->mad_priv->header.recv_wc.wc = &wc;
2400 local->mad_priv->header.recv_wc.mad_len =
2401 sizeof(struct ib_mad);
fa619a77
HR		 2402 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2403 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2404 &local->mad_priv->header.recv_wc.rmpp_list);
1da177e4
LT		 2405 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2406 local->mad_priv->header.recv_wc.recv_buf.mad =
2407 &local->mad_priv->mad.mad;
2408 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2409 snoop_recv(recv_mad_agent->qp_info,
2410 &local->mad_priv->header.recv_wc,
2411 IB_MAD_SNOOP_RECVS);
2412 recv_mad_agent->agent.recv_handler(
2413 &recv_mad_agent->agent,
2414 &local->mad_priv->header.recv_wc);
2415 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2416 atomic_dec(&recv_mad_agent->refcount);
2417 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2418 }
2419
2420local_send_completion:
2421 /* Complete send */
2422 mad_send_wc.status = IB_WC_SUCCESS;
2423 mad_send_wc.vendor_err = 0;
34816ad9 2424 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
1da177e4 2425 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
34816ad9
SH		 2426 snoop_send(mad_agent_priv->qp_info,
2427 &local->mad_send_wr->send_buf,
2428 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
1da177e4
LT		 2429 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2430 &mad_send_wc);
2431
2432 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1da177e4 2433 atomic_dec(&mad_agent_priv->refcount);
1d9bc6d6 2434 if (free_mad)
2c153b93 2435 kmem_cache_free(ib_mad_cache, local->mad_priv);
1da177e4
LT		 2436 kfree(local);
2437 }
2438 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2439}
2440
f75b7a52
HR		 2441static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2442{
2443 int ret;
2444
4fc8cd49 2445 if (!mad_send_wr->retries_left)
f75b7a52
HR		 2446 return -ETIMEDOUT;
2447
4fc8cd49
SH		 2448 mad_send_wr->retries_left--;
2449 mad_send_wr->send_buf.retries++;
2450
34816ad9 2451 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
f75b7a52 2452
fa619a77
HR		 2453 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2454 ret = ib_retry_rmpp(mad_send_wr);
2455 switch (ret) {
2456 case IB_RMPP_RESULT_UNHANDLED:
2457 ret = ib_send_mad(mad_send_wr);
2458 break;
2459 case IB_RMPP_RESULT_CONSUMED:
2460 ret = 0;
2461 break;
2462 default:
2463 ret = -ECOMM;
2464 break;
2465 }
2466 } else
2467 ret = ib_send_mad(mad_send_wr);
f75b7a52
HR		 2468
2469 if (!ret) {
2470 mad_send_wr->refcount++;
f75b7a52
HR		 2471 list_add_tail(&mad_send_wr->agent_list,
2472 &mad_send_wr->mad_agent_priv->send_list);
2473 }
2474 return ret;
2475}
2476
c4028958 2477static void timeout_sends(struct work_struct *work)
1da177e4
LT		 2478{
2479 struct ib_mad_agent_private *mad_agent_priv;
2480 struct ib_mad_send_wr_private *mad_send_wr;
2481 struct ib_mad_send_wc mad_send_wc;
2482 unsigned long flags, delay;
2483
c4028958
DH		 2484 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2485 timed_work.work);
1da177e4
LT		 2486 mad_send_wc.vendor_err = 0;
2487
2488 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2489 while (!list_empty(&mad_agent_priv->wait_list)) {
2490 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2491 struct ib_mad_send_wr_private,
2492 agent_list);
2493
2494 if (time_after(mad_send_wr->timeout, jiffies)) {
2495 delay = mad_send_wr->timeout - jiffies;
2496 if ((long)delay <= 0)
2497 delay = 1;
2498 queue_delayed_work(mad_agent_priv->qp_info->
2499 port_priv->wq,
2500 &mad_agent_priv->timed_work, delay);
2501 break;
2502 }
2503
dbf9227b 2504 list_del(&mad_send_wr->agent_list);
29bb33dd
HR		 2505 if (mad_send_wr->status == IB_WC_SUCCESS &&
2506 !retry_send(mad_send_wr))
f75b7a52
HR		 2507 continue;
2508
1da177e4
LT		 2509 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2510
03b61ad2
HR		 2511 if (mad_send_wr->status == IB_WC_SUCCESS)
2512 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2513 else
2514 mad_send_wc.status = mad_send_wr->status;
34816ad9 2515 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1da177e4
LT		 2516 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2517 &mad_send_wc);
2518
1da177e4
LT		 2519 atomic_dec(&mad_agent_priv->refcount);
2520 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2521 }
2522 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2523}
2524
5dd2ce12 2525static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
1da177e4
LT		 2526{
2527 struct ib_mad_port_private *port_priv = cq->cq_context;
dc05980d 2528 unsigned long flags;
1da177e4 2529
dc05980d
MT		 2530 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2531 if (!list_empty(&port_priv->port_list))
2532 queue_work(port_priv->wq, &port_priv->work);
2533 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
1da177e4
LT		 2534}
2535
2536/*
2537 * Allocate receive MADs and post receive WRs for them
2538 */
2539static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2540 struct ib_mad_private *mad)
2541{
2542 unsigned long flags;
2543 int post, ret;
2544 struct ib_mad_private *mad_priv;
2545 struct ib_sge sg_list;
2546 struct ib_recv_wr recv_wr, *bad_recv_wr;
2547 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2548
2549 /* Initialize common scatter list fields */
2550 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2551 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2552
2553 /* Initialize common receive WR fields */
2554 recv_wr.next = NULL;
2555 recv_wr.sg_list = &sg_list;
2556 recv_wr.num_sge = 1;
2557
2558 do {
2559 /* Allocate and map receive buffer */
2560 if (mad) {
2561 mad_priv = mad;
2562 mad = NULL;
2563 } else {
2564 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2565 if (!mad_priv) {
2566 printk(KERN_ERR PFX "No memory for receive buffer\n");
2567 ret = -ENOMEM;
2568 break;
2569 }
2570 }
1527106f
RC		 2571 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2572 &mad_priv->grh,
2573 sizeof *mad_priv -
2574 sizeof mad_priv->header,
2575 DMA_FROM_DEVICE);
2576 mad_priv->header.mapping = sg_list.addr;
1da177e4
LT		 2577 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2578 mad_priv->header.mad_list.mad_queue = recv_queue;
2579
2580 /* Post receive WR */
2581 spin_lock_irqsave(&recv_queue->lock, flags);
2582 post = (++recv_queue->count < recv_queue->max_active);
2583 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2584 spin_unlock_irqrestore(&recv_queue->lock, flags);
2585 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2586 if (ret) {
2587 spin_lock_irqsave(&recv_queue->lock, flags);
2588 list_del(&mad_priv->header.mad_list.list);
2589 recv_queue->count--;
2590 spin_unlock_irqrestore(&recv_queue->lock, flags);
1527106f
RC		 2591 ib_dma_unmap_single(qp_info->port_priv->device,
2592 mad_priv->header.mapping,
2593 sizeof *mad_priv -
2594 sizeof mad_priv->header,
2595 DMA_FROM_DEVICE);
1da177e4
LT		 2596 kmem_cache_free(ib_mad_cache, mad_priv);
2597 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2598 break;
2599 }
2600 } while (post);
2601
2602 return ret;
2603}
2604
2605/*
2606 * Return all the posted receive MADs
2607 */
2608static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2609{
2610 struct ib_mad_private_header *mad_priv_hdr;
2611 struct ib_mad_private *recv;
2612 struct ib_mad_list_head *mad_list;
2613
2614 while (!list_empty(&qp_info->recv_queue.list)) {
2615
2616 mad_list = list_entry(qp_info->recv_queue.list.next,
2617 struct ib_mad_list_head, list);
2618 mad_priv_hdr = container_of(mad_list,
2619 struct ib_mad_private_header,
2620 mad_list);
2621 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2622 header);
2623
2624 /* Remove from posted receive MAD list */
2625 list_del(&mad_list->list);
2626
1527106f
RC		 2627 ib_dma_unmap_single(qp_info->port_priv->device,
2628 recv->header.mapping,
2629 sizeof(struct ib_mad_private) -
2630 sizeof(struct ib_mad_private_header),
2631 DMA_FROM_DEVICE);
1da177e4
LT		 2632 kmem_cache_free(ib_mad_cache, recv);
2633 }
2634
2635 qp_info->recv_queue.count = 0;
2636}
2637
2638/*
2639 * Start the port
2640 */
2641static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2642{
2643 int ret, i;
2644 struct ib_qp_attr *attr;
2645 struct ib_qp *qp;
2646
2647 attr = kmalloc(sizeof *attr, GFP_KERNEL);
3cd96564 2648 if (!attr) {
1da177e4
LT		 2649 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2650 return -ENOMEM;
2651 }
2652
2653 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2654 qp = port_priv->qp_info[i].qp;
2655 /*
2656 * PKey index for QP1 is irrelevant but
2657 * one is needed for the Reset to Init transition
2658 */
2659 attr->qp_state = IB_QPS_INIT;
2660 attr->pkey_index = 0;
2661 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2662 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2663 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2664 if (ret) {
2665 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2666 "INIT: %d\n", i, ret);
2667 goto out;
2668 }
2669
2670 attr->qp_state = IB_QPS_RTR;
2671 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2672 if (ret) {
2673 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674 "RTR: %d\n", i, ret);
2675 goto out;
2676 }
2677
2678 attr->qp_state = IB_QPS_RTS;
2679 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2680 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2681 if (ret) {
2682 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2683 "RTS: %d\n", i, ret);
2684 goto out;
2685 }
2686 }
2687
2688 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2689 if (ret) {
2690 printk(KERN_ERR PFX "Failed to request completion "
2691 "notification: %d\n", ret);
2692 goto out;
2693 }
2694
2695 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2696 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2697 if (ret) {
2698 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2699 goto out;
2700 }
2701 }
2702out:
2703 kfree(attr);
2704 return ret;
2705}
2706
2707static void qp_event_handler(struct ib_event *event, void *qp_context)
2708{
2709 struct ib_mad_qp_info *qp_info = qp_context;
2710
2711 /* It's worse than that! He's dead, Jim! */
2712 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2713 event->event, qp_info->qp->qp_num);
2714}
2715
2716static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2717 struct ib_mad_queue *mad_queue)
2718{
2719 mad_queue->qp_info = qp_info;
2720 mad_queue->count = 0;
2721 spin_lock_init(&mad_queue->lock);
2722 INIT_LIST_HEAD(&mad_queue->list);
2723}
2724
2725static void init_mad_qp(struct ib_mad_port_private *port_priv,
2726 struct ib_mad_qp_info *qp_info)
2727{
2728 qp_info->port_priv = port_priv;
2729 init_mad_queue(qp_info, &qp_info->send_queue);
2730 init_mad_queue(qp_info, &qp_info->recv_queue);
2731 INIT_LIST_HEAD(&qp_info->overflow_list);
2732 spin_lock_init(&qp_info->snoop_lock);
2733 qp_info->snoop_table = NULL;
2734 qp_info->snoop_table_size = 0;
2735 atomic_set(&qp_info->snoop_count, 0);
2736}
2737
2738static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2739 enum ib_qp_type qp_type)
2740{
2741 struct ib_qp_init_attr qp_init_attr;
2742 int ret;
2743
2744 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2745 qp_init_attr.send_cq = qp_info->port_priv->cq;
2746 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2747 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
b76aabc3
HR		 2748 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2749 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
1da177e4
LT		 2750 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2751 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2752 qp_init_attr.qp_type = qp_type;
2753 qp_init_attr.port_num = qp_info->port_priv->port_num;
2754 qp_init_attr.qp_context = qp_info;
2755 qp_init_attr.event_handler = qp_event_handler;
2756 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2757 if (IS_ERR(qp_info->qp)) {
2758 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2759 get_spl_qp_index(qp_type));
2760 ret = PTR_ERR(qp_info->qp);
2761 goto error;
2762 }
2763 /* Use minimum queue sizes unless the CQ is resized */
b76aabc3
HR		 2764 qp_info->send_queue.max_active = mad_sendq_size;
2765 qp_info->recv_queue.max_active = mad_recvq_size;
1da177e4
LT		 2766 return 0;
2767
2768error:
2769 return ret;
2770}
2771
2772static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2773{
2774 ib_destroy_qp(qp_info->qp);
6044ec88 2775 kfree(qp_info->snoop_table);
1da177e4
LT		 2776}
2777
2778/*
2779 * Open the port
2780 * Create the QP, PD, MR, and CQ if needed
2781 */
2782static int ib_mad_port_open(struct ib_device *device,
2783 int port_num)
2784{
2785 int ret, cq_size;
2786 struct ib_mad_port_private *port_priv;
2787 unsigned long flags;
2788 char name[sizeof "ib_mad123"];
2789
1da177e4 2790 /* Create new device info */
de6eb66b 2791 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
1da177e4
LT		 2792 if (!port_priv) {
2793 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2794 return -ENOMEM;
2795 }
de6eb66b 2796
1da177e4
LT		 2797 port_priv->device = device;
2798 port_priv->port_num = port_num;
2799 spin_lock_init(&port_priv->reg_lock);
2800 INIT_LIST_HEAD(&port_priv->agent_list);
2801 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2802 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2803
b76aabc3 2804 cq_size = (mad_sendq_size + mad_recvq_size) * 2;
1da177e4 2805 port_priv->cq = ib_create_cq(port_priv->device,
5dd2ce12 2806 ib_mad_thread_completion_handler,
f4fd0b22 2807 NULL, port_priv, cq_size, 0);
1da177e4
LT		 2808 if (IS_ERR(port_priv->cq)) {
2809 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2810 ret = PTR_ERR(port_priv->cq);
2811 goto error3;
2812 }
2813
2814 port_priv->pd = ib_alloc_pd(device);
2815 if (IS_ERR(port_priv->pd)) {
2816 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2817 ret = PTR_ERR(port_priv->pd);
2818 goto error4;
2819 }
2820
2821 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2822 if (IS_ERR(port_priv->mr)) {
2823 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2824 ret = PTR_ERR(port_priv->mr);
2825 goto error5;
2826 }
2827
2828 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2829 if (ret)
2830 goto error6;
2831 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2832 if (ret)
2833 goto error7;
2834
2835 snprintf(name, sizeof name, "ib_mad%d", port_num);
2836 port_priv->wq = create_singlethread_workqueue(name);
2837 if (!port_priv->wq) {
2838 ret = -ENOMEM;
2839 goto error8;
2840 }
c4028958 2841 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
1da177e4 2842
dc05980d
MT		 2843 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2844 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2845 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2846
1da177e4
LT		 2847 ret = ib_mad_port_start(port_priv);
2848 if (ret) {
2849 printk(KERN_ERR PFX "Couldn't start port\n");
2850 goto error9;
2851 }
2852
1da177e4
LT		 2853 return 0;
2854
2855error9:
dc05980d
MT		 2856 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2857 list_del_init(&port_priv->port_list);
2858 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2859
1da177e4
LT		 2860 destroy_workqueue(port_priv->wq);
2861error8:
2862 destroy_mad_qp(&port_priv->qp_info[1]);
2863error7:
2864 destroy_mad_qp(&port_priv->qp_info[0]);
2865error6:
2866 ib_dereg_mr(port_priv->mr);
2867error5:
2868 ib_dealloc_pd(port_priv->pd);
2869error4:
2870 ib_destroy_cq(port_priv->cq);
2871 cleanup_recv_queue(&port_priv->qp_info[1]);
2872 cleanup_recv_queue(&port_priv->qp_info[0]);
2873error3:
2874 kfree(port_priv);
2875
2876 return ret;
2877}
2878
2879/*
2880 * Close the port
2881 * If there are no classes using the port, free the port
2882 * resources (CQ, MR, PD, QP) and remove the port's info structure
2883 */
2884static int ib_mad_port_close(struct ib_device *device, int port_num)
2885{
2886 struct ib_mad_port_private *port_priv;
2887 unsigned long flags;
2888
2889 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2890 port_priv = __ib_get_mad_port(device, port_num);
2891 if (port_priv == NULL) {
2892 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2893 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2894 return -ENODEV;
2895 }
dc05980d 2896 list_del_init(&port_priv->port_list);
1da177e4
LT		 2897 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2898
1da177e4
LT		 2899 destroy_workqueue(port_priv->wq);
2900 destroy_mad_qp(&port_priv->qp_info[1]);
2901 destroy_mad_qp(&port_priv->qp_info[0]);
2902 ib_dereg_mr(port_priv->mr);
2903 ib_dealloc_pd(port_priv->pd);
2904 ib_destroy_cq(port_priv->cq);
2905 cleanup_recv_queue(&port_priv->qp_info[1]);
2906 cleanup_recv_queue(&port_priv->qp_info[0]);
2907 /* XXX: Handle deallocation of MAD registration tables */
2908
2909 kfree(port_priv);
2910
2911 return 0;
2912}
2913
2914static void ib_mad_init_device(struct ib_device *device)
2915{
4ab6fb7e 2916 int start, end, i;
1da177e4 2917
07ebafba
TT		 2918 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2919 return;
2920
2921 if (device->node_type == RDMA_NODE_IB_SWITCH) {
4ab6fb7e
RD		 2922 start = 0;
2923 end = 0;
1da177e4 2924 } else {
4ab6fb7e
RD		 2925 start = 1;
2926 end = device->phys_port_cnt;
1da177e4 2927 }
4ab6fb7e
RD		 2928
2929 for (i = start; i <= end; i++) {
2930 if (ib_mad_port_open(device, i)) {
1da177e4 2931 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
4ab6fb7e
RD		 2932 device->name, i);
2933 goto error;
1da177e4 2934 }
4ab6fb7e 2935 if (ib_agent_port_open(device, i)) {
1da177e4
LT		 2936 printk(KERN_ERR PFX "Couldn't open %s port %d "
2937 "for agents\n",
4ab6fb7e
RD		 2938 device->name, i);
2939 goto error_agent;
1da177e4
LT		 2940 }
2941 }
f68bcc2d 2942 return;
1da177e4 2943
4ab6fb7e
RD		 2944error_agent:
2945 if (ib_mad_port_close(device, i))
2946 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2947 device->name, i);
2948
2949error:
2950 i--;
2951
2952 while (i >= start) {
2953 if (ib_agent_port_close(device, i))
1da177e4
LT		 2954 printk(KERN_ERR PFX "Couldn't close %s port %d "
2955 "for agents\n",
4ab6fb7e
RD		 2956 device->name, i);
2957 if (ib_mad_port_close(device, i))
1da177e4 2958 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
4ab6fb7e 2959 device->name, i);
1da177e4
LT		 2960 i--;
2961 }
1da177e4
LT		 2962}
2963
2964static void ib_mad_remove_device(struct ib_device *device)
2965{
f68bcc2d 2966 int i, num_ports, cur_port;
1da177e4 2967
07ebafba 2968 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1da177e4
LT		 2969 num_ports = 1;
2970 cur_port = 0;
2971 } else {
2972 num_ports = device->phys_port_cnt;
2973 cur_port = 1;
2974 }
2975 for (i = 0; i < num_ports; i++, cur_port++) {
f68bcc2d 2976 if (ib_agent_port_close(device, cur_port))
1da177e4
LT		 2977 printk(KERN_ERR PFX "Couldn't close %s port %d "
2978 "for agents\n",
2979 device->name, cur_port);
f68bcc2d 2980 if (ib_mad_port_close(device, cur_port))
1da177e4
LT		 2981 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2982 device->name, cur_port);
1da177e4
LT		 2983 }
2984}
2985
2986static struct ib_client mad_client = {
2987 .name = "mad",
2988 .add = ib_mad_init_device,
2989 .remove = ib_mad_remove_device
2990};
2991
2992static int __init ib_mad_init_module(void)
2993{
2994 int ret;
2995
b76aabc3
HR		 2996 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
2997 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
2998
2999 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3000 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3001
1da177e4 3002 spin_lock_init(&ib_mad_port_list_lock);
1da177e4
LT		 3003
3004 ib_mad_cache = kmem_cache_create("ib_mad",
3005 sizeof(struct ib_mad_private),
3006 0,
3007 SLAB_HWCACHE_ALIGN,
1da177e4
LT		 3008 NULL);
3009 if (!ib_mad_cache) {
3010 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3011 ret = -ENOMEM;
3012 goto error1;
3013 }
3014
3015 INIT_LIST_HEAD(&ib_mad_port_list);
3016
3017 if (ib_register_client(&mad_client)) {
3018 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3019 ret = -EINVAL;
3020 goto error2;
3021 }
3022
3023 return 0;
3024
3025error2:
3026 kmem_cache_destroy(ib_mad_cache);
3027error1:
3028 return ret;
3029}
3030
3031static void __exit ib_mad_cleanup_module(void)
3032{
3033 ib_unregister_client(&mad_client);
1a1d92c1 3034 kmem_cache_destroy(ib_mad_cache);
1da177e4
LT		 3035}
3036
3037module_init(ib_mad_init_module);
3038module_exit(ib_mad_cleanup_module);
fa619a77 3039
Linux 6.x block layer and io_uring tree(s)