d4d07012a5ca6251f0f4dc2302741b9024251dee
[linux-3.10.git] / drivers / infiniband / core / mad.c
1 /*
2  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
4  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  *
34  * $Id: mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
35  */
36 #include <linux/dma-mapping.h>
37
38 #include "mad_priv.h"
39 #include "mad_rmpp.h"
40 #include "smi.h"
41 #include "agent.h"
42
43 MODULE_LICENSE("Dual BSD/GPL");
44 MODULE_DESCRIPTION("kernel IB MAD API");
45 MODULE_AUTHOR("Hal Rosenstock");
46 MODULE_AUTHOR("Sean Hefty");
47
48
49 kmem_cache_t *ib_mad_cache;
50
51 static struct list_head ib_mad_port_list;
52 static u32 ib_mad_client_id = 0;
53
54 /* Port list lock */
55 static spinlock_t ib_mad_port_list_lock;
56
57
58 /* Forward declarations */
59 static int method_in_use(struct ib_mad_mgmt_method_table **method,
60                          struct ib_mad_reg_req *mad_reg_req);
61 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
62 static struct ib_mad_agent_private *find_mad_agent(
63                                         struct ib_mad_port_private *port_priv,
64                                         struct ib_mad *mad);
65 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
66                                     struct ib_mad_private *mad);
67 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
68 static void timeout_sends(void *data);
69 static void local_completions(void *data);
70 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
71                               struct ib_mad_agent_private *agent_priv,
72                               u8 mgmt_class);
73 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
74                            struct ib_mad_agent_private *agent_priv);
75
76 /*
77  * Returns a ib_mad_port_private structure or NULL for a device/port
78  * Assumes ib_mad_port_list_lock is being held
79  */
80 static inline struct ib_mad_port_private *
81 __ib_get_mad_port(struct ib_device *device, int port_num)
82 {
83         struct ib_mad_port_private *entry;
84
85         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
86                 if (entry->device == device && entry->port_num == port_num)
87                         return entry;
88         }
89         return NULL;
90 }
91
92 /*
93  * Wrapper function to return a ib_mad_port_private structure or NULL
94  * for a device/port
95  */
96 static inline struct ib_mad_port_private *
97 ib_get_mad_port(struct ib_device *device, int port_num)
98 {
99         struct ib_mad_port_private *entry;
100         unsigned long flags;
101
102         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
103         entry = __ib_get_mad_port(device, port_num);
104         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
105
106         return entry;
107 }
108
109 static inline u8 convert_mgmt_class(u8 mgmt_class)
110 {
111         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
112         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
113                 0 : mgmt_class;
114 }
115
116 static int get_spl_qp_index(enum ib_qp_type qp_type)
117 {
118         switch (qp_type)
119         {
120         case IB_QPT_SMI:
121                 return 0;
122         case IB_QPT_GSI:
123                 return 1;
124         default:
125                 return -1;
126         }
127 }
128
129 static int vendor_class_index(u8 mgmt_class)
130 {
131         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
132 }
133
134 static int is_vendor_class(u8 mgmt_class)
135 {
136         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
137             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
138                 return 0;
139         return 1;
140 }
141
142 static int is_vendor_oui(char *oui)
143 {
144         if (oui[0] || oui[1] || oui[2])
145                 return 1;
146         return 0;
147 }
148
149 static int is_vendor_method_in_use(
150                 struct ib_mad_mgmt_vendor_class *vendor_class,
151                 struct ib_mad_reg_req *mad_reg_req)
152 {
153         struct ib_mad_mgmt_method_table *method;
154         int i;
155
156         for (i = 0; i < MAX_MGMT_OUI; i++) {
157                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
158                         method = vendor_class->method_table[i];
159                         if (method) {
160                                 if (method_in_use(&method, mad_reg_req))
161                                         return 1;
162                                 else
163                                         break;
164                         }
165                 }
166         }
167         return 0;
168 }
169
170 /*
171  * ib_register_mad_agent - Register to send/receive MADs
172  */
173 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
174                                            u8 port_num,
175                                            enum ib_qp_type qp_type,
176                                            struct ib_mad_reg_req *mad_reg_req,
177                                            u8 rmpp_version,
178                                            ib_mad_send_handler send_handler,
179                                            ib_mad_recv_handler recv_handler,
180                                            void *context)
181 {
182         struct ib_mad_port_private *port_priv;
183         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
184         struct ib_mad_agent_private *mad_agent_priv;
185         struct ib_mad_reg_req *reg_req = NULL;
186         struct ib_mad_mgmt_class_table *class;
187         struct ib_mad_mgmt_vendor_class_table *vendor;
188         struct ib_mad_mgmt_vendor_class *vendor_class;
189         struct ib_mad_mgmt_method_table *method;
190         int ret2, qpn;
191         unsigned long flags;
192         u8 mgmt_class, vclass;
193
194         /* Validate parameters */
195         qpn = get_spl_qp_index(qp_type);
196         if (qpn == -1)
197                 goto error1;
198
199         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
200                 goto error1;
201
202         /* Validate MAD registration request if supplied */
203         if (mad_reg_req) {
204                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
205                         goto error1;
206                 if (!recv_handler)
207                         goto error1;
208                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
209                         /*
210                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
211                          * one in this range currently allowed
212                          */
213                         if (mad_reg_req->mgmt_class !=
214                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
215                                 goto error1;
216                 } else if (mad_reg_req->mgmt_class == 0) {
217                         /*
218                          * Class 0 is reserved in IBA and is used for
219                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
220                          */
221                         goto error1;
222                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
223                         /*
224                          * If class is in "new" vendor range,
225                          * ensure supplied OUI is not zero
226                          */
227                         if (!is_vendor_oui(mad_reg_req->oui))
228                                 goto error1;
229                 }
230                 /* Make sure class supplied is consistent with QP type */
231                 if (qp_type == IB_QPT_SMI) {
232                         if ((mad_reg_req->mgmt_class !=
233                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
234                             (mad_reg_req->mgmt_class !=
235                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
236                                 goto error1;
237                 } else {
238                         if ((mad_reg_req->mgmt_class ==
239                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
240                             (mad_reg_req->mgmt_class ==
241                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
242                                 goto error1;
243                 }
244         } else {
245                 /* No registration request supplied */
246                 if (!send_handler)
247                         goto error1;
248         }
249
250         /* Validate device and port */
251         port_priv = ib_get_mad_port(device, port_num);
252         if (!port_priv) {
253                 ret = ERR_PTR(-ENODEV);
254                 goto error1;
255         }
256
257         /* Allocate structures */
258         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
259         if (!mad_agent_priv) {
260                 ret = ERR_PTR(-ENOMEM);
261                 goto error1;
262         }
263
264         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
265                                                  IB_ACCESS_LOCAL_WRITE);
266         if (IS_ERR(mad_agent_priv->agent.mr)) {
267                 ret = ERR_PTR(-ENOMEM);
268                 goto error2;
269         }
270
271         if (mad_reg_req) {
272                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
273                 if (!reg_req) {
274                         ret = ERR_PTR(-ENOMEM);
275                         goto error3;
276                 }
277                 /* Make a copy of the MAD registration request */
278                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
279         }
280
281         /* Now, fill in the various structures */
282         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
283         mad_agent_priv->reg_req = reg_req;
284         mad_agent_priv->agent.rmpp_version = rmpp_version;
285         mad_agent_priv->agent.device = device;
286         mad_agent_priv->agent.recv_handler = recv_handler;
287         mad_agent_priv->agent.send_handler = send_handler;
288         mad_agent_priv->agent.context = context;
289         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
290         mad_agent_priv->agent.port_num = port_num;
291
292         spin_lock_irqsave(&port_priv->reg_lock, flags);
293         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
294
295         /*
296          * Make sure MAD registration (if supplied)
297          * is non overlapping with any existing ones
298          */
299         if (mad_reg_req) {
300                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
301                 if (!is_vendor_class(mgmt_class)) {
302                         class = port_priv->version[mad_reg_req->
303                                                    mgmt_class_version].class;
304                         if (class) {
305                                 method = class->method_table[mgmt_class];
306                                 if (method) {
307                                         if (method_in_use(&method,
308                                                            mad_reg_req))
309                                                 goto error4;
310                                 }
311                         }
312                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
313                                                   mgmt_class);
314                 } else {
315                         /* "New" vendor class range */
316                         vendor = port_priv->version[mad_reg_req->
317                                                     mgmt_class_version].vendor;
318                         if (vendor) {
319                                 vclass = vendor_class_index(mgmt_class);
320                                 vendor_class = vendor->vendor_class[vclass];
321                                 if (vendor_class) {
322                                         if (is_vendor_method_in_use(
323                                                         vendor_class,
324                                                         mad_reg_req))
325                                                 goto error4;
326                                 }
327                         }
328                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
329                 }
330                 if (ret2) {
331                         ret = ERR_PTR(ret2);
332                         goto error4;
333                 }
334         }
335
336         /* Add mad agent into port's agent list */
337         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
338         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
339
340         spin_lock_init(&mad_agent_priv->lock);
341         INIT_LIST_HEAD(&mad_agent_priv->send_list);
342         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
343         INIT_LIST_HEAD(&mad_agent_priv->done_list);
344         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
345         INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
346         INIT_LIST_HEAD(&mad_agent_priv->local_list);
347         INIT_WORK(&mad_agent_priv->local_work, local_completions,
348                    mad_agent_priv);
349         atomic_set(&mad_agent_priv->refcount, 1);
350         init_waitqueue_head(&mad_agent_priv->wait);
351
352         return &mad_agent_priv->agent;
353
354 error4:
355         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
356         kfree(reg_req);
357 error3:
358         ib_dereg_mr(mad_agent_priv->agent.mr);
359 error2:
360         kfree(mad_agent_priv);
361 error1:
362         return ret;
363 }
364 EXPORT_SYMBOL(ib_register_mad_agent);
365
366 static inline int is_snooping_sends(int mad_snoop_flags)
367 {
368         return (mad_snoop_flags &
369                 (/*IB_MAD_SNOOP_POSTED_SENDS |
370                  IB_MAD_SNOOP_RMPP_SENDS |*/
371                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
372                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
373 }
374
375 static inline int is_snooping_recvs(int mad_snoop_flags)
376 {
377         return (mad_snoop_flags &
378                 (IB_MAD_SNOOP_RECVS /*|
379                  IB_MAD_SNOOP_RMPP_RECVS*/));
380 }
381
382 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
383                                 struct ib_mad_snoop_private *mad_snoop_priv)
384 {
385         struct ib_mad_snoop_private **new_snoop_table;
386         unsigned long flags;
387         int i;
388
389         spin_lock_irqsave(&qp_info->snoop_lock, flags);
390         /* Check for empty slot in array. */
391         for (i = 0; i < qp_info->snoop_table_size; i++)
392                 if (!qp_info->snoop_table[i])
393                         break;
394
395         if (i == qp_info->snoop_table_size) {
396                 /* Grow table. */
397                 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
398                                           qp_info->snoop_table_size + 1,
399                                           GFP_ATOMIC);
400                 if (!new_snoop_table) {
401                         i = -ENOMEM;
402                         goto out;
403                 }
404                 if (qp_info->snoop_table) {
405                         memcpy(new_snoop_table, qp_info->snoop_table,
406                                sizeof mad_snoop_priv *
407                                qp_info->snoop_table_size);
408                         kfree(qp_info->snoop_table);
409                 }
410                 qp_info->snoop_table = new_snoop_table;
411                 qp_info->snoop_table_size++;
412         }
413         qp_info->snoop_table[i] = mad_snoop_priv;
414         atomic_inc(&qp_info->snoop_count);
415 out:
416         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
417         return i;
418 }
419
420 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
421                                            u8 port_num,
422                                            enum ib_qp_type qp_type,
423                                            int mad_snoop_flags,
424                                            ib_mad_snoop_handler snoop_handler,
425                                            ib_mad_recv_handler recv_handler,
426                                            void *context)
427 {
428         struct ib_mad_port_private *port_priv;
429         struct ib_mad_agent *ret;
430         struct ib_mad_snoop_private *mad_snoop_priv;
431         int qpn;
432
433         /* Validate parameters */
434         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
435             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
436                 ret = ERR_PTR(-EINVAL);
437                 goto error1;
438         }
439         qpn = get_spl_qp_index(qp_type);
440         if (qpn == -1) {
441                 ret = ERR_PTR(-EINVAL);
442                 goto error1;
443         }
444         port_priv = ib_get_mad_port(device, port_num);
445         if (!port_priv) {
446                 ret = ERR_PTR(-ENODEV);
447                 goto error1;
448         }
449         /* Allocate structures */
450         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
451         if (!mad_snoop_priv) {
452                 ret = ERR_PTR(-ENOMEM);
453                 goto error1;
454         }
455
456         /* Now, fill in the various structures */
457         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
458         mad_snoop_priv->agent.device = device;
459         mad_snoop_priv->agent.recv_handler = recv_handler;
460         mad_snoop_priv->agent.snoop_handler = snoop_handler;
461         mad_snoop_priv->agent.context = context;
462         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
463         mad_snoop_priv->agent.port_num = port_num;
464         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
465         init_waitqueue_head(&mad_snoop_priv->wait);
466         mad_snoop_priv->snoop_index = register_snoop_agent(
467                                                 &port_priv->qp_info[qpn],
468                                                 mad_snoop_priv);
469         if (mad_snoop_priv->snoop_index < 0) {
470                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
471                 goto error2;
472         }
473
474         atomic_set(&mad_snoop_priv->refcount, 1);
475         return &mad_snoop_priv->agent;
476
477 error2:
478         kfree(mad_snoop_priv);
479 error1:
480         return ret;
481 }
482 EXPORT_SYMBOL(ib_register_mad_snoop);
483
484 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
485 {
486         struct ib_mad_port_private *port_priv;
487         unsigned long flags;
488
489         /* Note that we could still be handling received MADs */
490
491         /*
492          * Canceling all sends results in dropping received response
493          * MADs, preventing us from queuing additional work
494          */
495         cancel_mads(mad_agent_priv);
496         port_priv = mad_agent_priv->qp_info->port_priv;
497         cancel_delayed_work(&mad_agent_priv->timed_work);
498
499         spin_lock_irqsave(&port_priv->reg_lock, flags);
500         remove_mad_reg_req(mad_agent_priv);
501         list_del(&mad_agent_priv->agent_list);
502         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
503
504         flush_workqueue(port_priv->wq);
505         ib_cancel_rmpp_recvs(mad_agent_priv);
506
507         atomic_dec(&mad_agent_priv->refcount);
508         wait_event(mad_agent_priv->wait,
509                    !atomic_read(&mad_agent_priv->refcount));
510
511         kfree(mad_agent_priv->reg_req);
512         ib_dereg_mr(mad_agent_priv->agent.mr);
513         kfree(mad_agent_priv);
514 }
515
516 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
517 {
518         struct ib_mad_qp_info *qp_info;
519         unsigned long flags;
520
521         qp_info = mad_snoop_priv->qp_info;
522         spin_lock_irqsave(&qp_info->snoop_lock, flags);
523         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
524         atomic_dec(&qp_info->snoop_count);
525         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
526
527         atomic_dec(&mad_snoop_priv->refcount);
528         wait_event(mad_snoop_priv->wait,
529                    !atomic_read(&mad_snoop_priv->refcount));
530
531         kfree(mad_snoop_priv);
532 }
533
534 /*
535  * ib_unregister_mad_agent - Unregisters a client from using MAD services
536  */
537 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
538 {
539         struct ib_mad_agent_private *mad_agent_priv;
540         struct ib_mad_snoop_private *mad_snoop_priv;
541
542         /* If the TID is zero, the agent can only snoop. */
543         if (mad_agent->hi_tid) {
544                 mad_agent_priv = container_of(mad_agent,
545                                               struct ib_mad_agent_private,
546                                               agent);
547                 unregister_mad_agent(mad_agent_priv);
548         } else {
549                 mad_snoop_priv = container_of(mad_agent,
550                                               struct ib_mad_snoop_private,
551                                               agent);
552                 unregister_mad_snoop(mad_snoop_priv);
553         }
554         return 0;
555 }
556 EXPORT_SYMBOL(ib_unregister_mad_agent);
557
558 static inline int response_mad(struct ib_mad *mad)
559 {
560         /* Trap represses are responses although response bit is reset */
561         return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
562                 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
563 }
564
565 static void dequeue_mad(struct ib_mad_list_head *mad_list)
566 {
567         struct ib_mad_queue *mad_queue;
568         unsigned long flags;
569
570         BUG_ON(!mad_list->mad_queue);
571         mad_queue = mad_list->mad_queue;
572         spin_lock_irqsave(&mad_queue->lock, flags);
573         list_del(&mad_list->list);
574         mad_queue->count--;
575         spin_unlock_irqrestore(&mad_queue->lock, flags);
576 }
577
578 static void snoop_send(struct ib_mad_qp_info *qp_info,
579                        struct ib_mad_send_buf *send_buf,
580                        struct ib_mad_send_wc *mad_send_wc,
581                        int mad_snoop_flags)
582 {
583         struct ib_mad_snoop_private *mad_snoop_priv;
584         unsigned long flags;
585         int i;
586
587         spin_lock_irqsave(&qp_info->snoop_lock, flags);
588         for (i = 0; i < qp_info->snoop_table_size; i++) {
589                 mad_snoop_priv = qp_info->snoop_table[i];
590                 if (!mad_snoop_priv ||
591                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
592                         continue;
593
594                 atomic_inc(&mad_snoop_priv->refcount);
595                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
596                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
597                                                     send_buf, mad_send_wc);
598                 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
599                         wake_up(&mad_snoop_priv->wait);
600                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
601         }
602         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
603 }
604
605 static void snoop_recv(struct ib_mad_qp_info *qp_info,
606                        struct ib_mad_recv_wc *mad_recv_wc,
607                        int mad_snoop_flags)
608 {
609         struct ib_mad_snoop_private *mad_snoop_priv;
610         unsigned long flags;
611         int i;
612
613         spin_lock_irqsave(&qp_info->snoop_lock, flags);
614         for (i = 0; i < qp_info->snoop_table_size; i++) {
615                 mad_snoop_priv = qp_info->snoop_table[i];
616                 if (!mad_snoop_priv ||
617                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
618                         continue;
619
620                 atomic_inc(&mad_snoop_priv->refcount);
621                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
622                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
623                                                    mad_recv_wc);
624                 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
625                         wake_up(&mad_snoop_priv->wait);
626                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
627         }
628         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
629 }
630
631 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
632                          struct ib_wc *wc)
633 {
634         memset(wc, 0, sizeof *wc);
635         wc->wr_id = wr_id;
636         wc->status = IB_WC_SUCCESS;
637         wc->opcode = IB_WC_RECV;
638         wc->pkey_index = pkey_index;
639         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
640         wc->src_qp = IB_QP0;
641         wc->qp_num = IB_QP0;
642         wc->slid = slid;
643         wc->sl = 0;
644         wc->dlid_path_bits = 0;
645         wc->port_num = port_num;
646 }
647
648 /*
649  * Return 0 if SMP is to be sent
650  * Return 1 if SMP was consumed locally (whether or not solicited)
651  * Return < 0 if error
652  */
653 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
654                                   struct ib_mad_send_wr_private *mad_send_wr)
655 {
656         int ret;
657         struct ib_smp *smp = mad_send_wr->send_buf.mad;
658         unsigned long flags;
659         struct ib_mad_local_private *local;
660         struct ib_mad_private *mad_priv;
661         struct ib_mad_port_private *port_priv;
662         struct ib_mad_agent_private *recv_mad_agent = NULL;
663         struct ib_device *device = mad_agent_priv->agent.device;
664         u8 port_num = mad_agent_priv->agent.port_num;
665         struct ib_wc mad_wc;
666         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
667
668         /*
669          * Directed route handling starts if the initial LID routed part of
670          * a request or the ending LID routed part of a response is empty.
671          * If we are at the start of the LID routed part, don't update the
672          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
673          */
674         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
675              IB_LID_PERMISSIVE &&
676             !smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
677                 ret = -EINVAL;
678                 printk(KERN_ERR PFX "Invalid directed route\n");
679                 goto out;
680         }
681         /* Check to post send on QP or process locally */
682         ret = smi_check_local_smp(smp, device);
683         if (!ret)
684                 goto out;
685
686         local = kmalloc(sizeof *local, GFP_ATOMIC);
687         if (!local) {
688                 ret = -ENOMEM;
689                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
690                 goto out;
691         }
692         local->mad_priv = NULL;
693         local->recv_mad_agent = NULL;
694         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
695         if (!mad_priv) {
696                 ret = -ENOMEM;
697                 printk(KERN_ERR PFX "No memory for local response MAD\n");
698                 kfree(local);
699                 goto out;
700         }
701
702         build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
703                      send_wr->wr.ud.pkey_index,
704                      send_wr->wr.ud.port_num, &mad_wc);
705
706         /* No GRH for DR SMP */
707         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
708                                   (struct ib_mad *)smp,
709                                   (struct ib_mad *)&mad_priv->mad);
710         switch (ret)
711         {
712         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
713                 if (response_mad(&mad_priv->mad.mad) &&
714                     mad_agent_priv->agent.recv_handler) {
715                         local->mad_priv = mad_priv;
716                         local->recv_mad_agent = mad_agent_priv;
717                         /*
718                          * Reference MAD agent until receive
719                          * side of local completion handled
720                          */
721                         atomic_inc(&mad_agent_priv->refcount);
722                 } else
723                         kmem_cache_free(ib_mad_cache, mad_priv);
724                 break;
725         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
726                 kmem_cache_free(ib_mad_cache, mad_priv);
727                 break;
728         case IB_MAD_RESULT_SUCCESS:
729                 /* Treat like an incoming receive MAD */
730                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
731                                             mad_agent_priv->agent.port_num);
732                 if (port_priv) {
733                         mad_priv->mad.mad.mad_hdr.tid =
734                                 ((struct ib_mad *)smp)->mad_hdr.tid;
735                         recv_mad_agent = find_mad_agent(port_priv,
736                                                         &mad_priv->mad.mad);
737                 }
738                 if (!port_priv || !recv_mad_agent) {
739                         kmem_cache_free(ib_mad_cache, mad_priv);
740                         kfree(local);
741                         ret = 0;
742                         goto out;
743                 }
744                 local->mad_priv = mad_priv;
745                 local->recv_mad_agent = recv_mad_agent;
746                 break;
747         default:
748                 kmem_cache_free(ib_mad_cache, mad_priv);
749                 kfree(local);
750                 ret = -EINVAL;
751                 goto out;
752         }
753
754         local->mad_send_wr = mad_send_wr;
755         /* Reference MAD agent until send side of local completion handled */
756         atomic_inc(&mad_agent_priv->refcount);
757         /* Queue local completion to local list */
758         spin_lock_irqsave(&mad_agent_priv->lock, flags);
759         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
760         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
761         queue_work(mad_agent_priv->qp_info->port_priv->wq,
762                    &mad_agent_priv->local_work);
763         ret = 1;
764 out:
765         return ret;
766 }
767
768 static int get_pad_size(int hdr_len, int data_len)
769 {
770         int seg_size, pad;
771
772         seg_size = sizeof(struct ib_mad) - hdr_len;
773         if (data_len && seg_size) {
774                 pad = seg_size - data_len % seg_size;
775                 return pad == seg_size ? 0 : pad;
776         } else
777                 return seg_size;
778 }
779
780 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
781 {
782         struct ib_rmpp_segment *s, *t;
783
784         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
785                 list_del(&s->list);
786                 kfree(s);
787         }
788 }
789
790 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
791                                 gfp_t gfp_mask)
792 {
793         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
794         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
795         struct ib_rmpp_segment *seg = NULL;
796         int left, seg_size, pad;
797
798         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
799         seg_size = send_buf->seg_size;
800         pad = send_wr->pad;
801
802         /* Allocate data segments. */
803         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
804                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
805                 if (!seg) {
806                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
807                                "alloc failed for len %zd, gfp %#x\n",
808                                sizeof (*seg) + seg_size, gfp_mask);
809                         free_send_rmpp_list(send_wr);
810                         return -ENOMEM;
811                 }
812                 seg->num = ++send_buf->seg_count;
813                 list_add_tail(&seg->list, &send_wr->rmpp_list);
814         }
815
816         /* Zero any padding */
817         if (pad)
818                 memset(seg->data + seg_size - pad, 0, pad);
819
820         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
821                                           agent.rmpp_version;
822         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
823         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
824
825         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
826                                         struct ib_rmpp_segment, list);
827         send_wr->last_ack_seg = send_wr->cur_seg;
828         return 0;
829 }
830
831 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
832                                             u32 remote_qpn, u16 pkey_index,
833                                             int rmpp_active,
834                                             int hdr_len, int data_len,
835                                             gfp_t gfp_mask)
836 {
837         struct ib_mad_agent_private *mad_agent_priv;
838         struct ib_mad_send_wr_private *mad_send_wr;
839         int pad, message_size, ret, size;
840         void *buf;
841
842         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
843                                       agent);
844         pad = get_pad_size(hdr_len, data_len);
845         message_size = hdr_len + data_len + pad;
846
847         if ((!mad_agent->rmpp_version &&
848              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
849             (!rmpp_active && message_size > sizeof(struct ib_mad)))
850                 return ERR_PTR(-EINVAL);
851
852         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
853         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
854         if (!buf)
855                 return ERR_PTR(-ENOMEM);
856
857         mad_send_wr = buf + size;
858         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
859         mad_send_wr->send_buf.mad = buf;
860         mad_send_wr->send_buf.hdr_len = hdr_len;
861         mad_send_wr->send_buf.data_len = data_len;
862         mad_send_wr->pad = pad;
863
864         mad_send_wr->mad_agent_priv = mad_agent_priv;
865         mad_send_wr->sg_list[0].length = hdr_len;
866         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
867         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
868         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
869
870         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
871         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
872         mad_send_wr->send_wr.num_sge = 2;
873         mad_send_wr->send_wr.opcode = IB_WR_SEND;
874         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
875         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
876         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
877         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
878
879         if (rmpp_active) {
880                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
881                 if (ret) {
882                         kfree(buf);
883                         return ERR_PTR(ret);
884                 }
885         }
886
887         mad_send_wr->send_buf.mad_agent = mad_agent;
888         atomic_inc(&mad_agent_priv->refcount);
889         return &mad_send_wr->send_buf;
890 }
891 EXPORT_SYMBOL(ib_create_send_mad);
892
893 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
894 {
895         struct ib_mad_send_wr_private *mad_send_wr;
896         struct list_head *list;
897
898         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
899                                    send_buf);
900         list = &mad_send_wr->cur_seg->list;
901
902         if (mad_send_wr->cur_seg->num < seg_num) {
903                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
904                         if (mad_send_wr->cur_seg->num == seg_num)
905                                 break;
906         } else if (mad_send_wr->cur_seg->num > seg_num) {
907                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
908                         if (mad_send_wr->cur_seg->num == seg_num)
909                                 break;
910         }
911         return mad_send_wr->cur_seg->data;
912 }
913 EXPORT_SYMBOL(ib_get_rmpp_segment);
914
915 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
916 {
917         if (mad_send_wr->send_buf.seg_count)
918                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
919                                            mad_send_wr->seg_num);
920         else
921                 return mad_send_wr->send_buf.mad +
922                        mad_send_wr->send_buf.hdr_len;
923 }
924
925 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
926 {
927         struct ib_mad_agent_private *mad_agent_priv;
928         struct ib_mad_send_wr_private *mad_send_wr;
929
930         mad_agent_priv = container_of(send_buf->mad_agent,
931                                       struct ib_mad_agent_private, agent);
932         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
933                                    send_buf);
934
935         free_send_rmpp_list(mad_send_wr);
936         kfree(send_buf->mad);
937         if (atomic_dec_and_test(&mad_agent_priv->refcount))
938                 wake_up(&mad_agent_priv->wait);
939 }
940 EXPORT_SYMBOL(ib_free_send_mad);
941
942 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
943 {
944         struct ib_mad_qp_info *qp_info;
945         struct list_head *list;
946         struct ib_send_wr *bad_send_wr;
947         struct ib_mad_agent *mad_agent;
948         struct ib_sge *sge;
949         unsigned long flags;
950         int ret;
951
952         /* Set WR ID to find mad_send_wr upon completion */
953         qp_info = mad_send_wr->mad_agent_priv->qp_info;
954         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
955         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
956
957         mad_agent = mad_send_wr->send_buf.mad_agent;
958         sge = mad_send_wr->sg_list;
959         sge[0].addr = dma_map_single(mad_agent->device->dma_device,
960                                      mad_send_wr->send_buf.mad,
961                                      sge[0].length,
962                                      DMA_TO_DEVICE);
963         pci_unmap_addr_set(mad_send_wr, header_mapping, sge[0].addr);
964
965         sge[1].addr = dma_map_single(mad_agent->device->dma_device,
966                                      ib_get_payload(mad_send_wr),
967                                      sge[1].length,
968                                      DMA_TO_DEVICE);
969         pci_unmap_addr_set(mad_send_wr, payload_mapping, sge[1].addr);
970
971         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
972         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
973                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
974                                    &bad_send_wr);
975                 list = &qp_info->send_queue.list;
976         } else {
977                 ret = 0;
978                 list = &qp_info->overflow_list;
979         }
980
981         if (!ret) {
982                 qp_info->send_queue.count++;
983                 list_add_tail(&mad_send_wr->mad_list.list, list);
984         }
985         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
986         if (ret) {
987                 dma_unmap_single(mad_agent->device->dma_device,
988                                  pci_unmap_addr(mad_send_wr, header_mapping),
989                                  sge[0].length, DMA_TO_DEVICE);
990                 dma_unmap_single(mad_agent->device->dma_device,
991                                  pci_unmap_addr(mad_send_wr, payload_mapping),
992                                  sge[1].length, DMA_TO_DEVICE);
993         }
994         return ret;
995 }
996
997 /*
998  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
999  *  with the registered client
1000  */
1001 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1002                      struct ib_mad_send_buf **bad_send_buf)
1003 {
1004         struct ib_mad_agent_private *mad_agent_priv;
1005         struct ib_mad_send_buf *next_send_buf;
1006         struct ib_mad_send_wr_private *mad_send_wr;
1007         unsigned long flags;
1008         int ret = -EINVAL;
1009
1010         /* Walk list of send WRs and post each on send list */
1011         for (; send_buf; send_buf = next_send_buf) {
1012
1013                 mad_send_wr = container_of(send_buf,
1014                                            struct ib_mad_send_wr_private,
1015                                            send_buf);
1016                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1017
1018                 if (!send_buf->mad_agent->send_handler ||
1019                     (send_buf->timeout_ms &&
1020                      !send_buf->mad_agent->recv_handler)) {
1021                         ret = -EINVAL;
1022                         goto error;
1023                 }
1024
1025                 /*
1026                  * Save pointer to next work request to post in case the
1027                  * current one completes, and the user modifies the work
1028                  * request associated with the completion
1029                  */
1030                 next_send_buf = send_buf->next;
1031                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1032
1033                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1034                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1035                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1036                                                      mad_send_wr);
1037                         if (ret < 0)            /* error */
1038                                 goto error;
1039                         else if (ret == 1)      /* locally consumed */
1040                                 continue;
1041                 }
1042
1043                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1044                 /* Timeout will be updated after send completes */
1045                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1046                 mad_send_wr->retries = send_buf->retries;
1047                 /* Reference for work request to QP + response */
1048                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1049                 mad_send_wr->status = IB_WC_SUCCESS;
1050
1051                 /* Reference MAD agent until send completes */
1052                 atomic_inc(&mad_agent_priv->refcount);
1053                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1054                 list_add_tail(&mad_send_wr->agent_list,
1055                               &mad_agent_priv->send_list);
1056                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1057
1058                 if (mad_agent_priv->agent.rmpp_version) {
1059                         ret = ib_send_rmpp_mad(mad_send_wr);
1060                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1061                                 ret = ib_send_mad(mad_send_wr);
1062                 } else
1063                         ret = ib_send_mad(mad_send_wr);
1064                 if (ret < 0) {
1065                         /* Fail send request */
1066                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1067                         list_del(&mad_send_wr->agent_list);
1068                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1069                         atomic_dec(&mad_agent_priv->refcount);
1070                         goto error;
1071                 }
1072         }
1073         return 0;
1074 error:
1075         if (bad_send_buf)
1076                 *bad_send_buf = send_buf;
1077         return ret;
1078 }
1079 EXPORT_SYMBOL(ib_post_send_mad);
1080
1081 /*
1082  * ib_free_recv_mad - Returns data buffers used to receive
1083  *  a MAD to the access layer
1084  */
1085 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1086 {
1087         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1088         struct ib_mad_private_header *mad_priv_hdr;
1089         struct ib_mad_private *priv;
1090         struct list_head free_list;
1091
1092         INIT_LIST_HEAD(&free_list);
1093         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1094
1095         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1096                                         &free_list, list) {
1097                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1098                                            recv_buf);
1099                 mad_priv_hdr = container_of(mad_recv_wc,
1100                                             struct ib_mad_private_header,
1101                                             recv_wc);
1102                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1103                                     header);
1104                 kmem_cache_free(ib_mad_cache, priv);
1105         }
1106 }
1107 EXPORT_SYMBOL(ib_free_recv_mad);
1108
1109 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1110                                         u8 rmpp_version,
1111                                         ib_mad_send_handler send_handler,
1112                                         ib_mad_recv_handler recv_handler,
1113                                         void *context)
1114 {
1115         return ERR_PTR(-EINVAL);        /* XXX: for now */
1116 }
1117 EXPORT_SYMBOL(ib_redirect_mad_qp);
1118
1119 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1120                       struct ib_wc *wc)
1121 {
1122         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1123         return 0;
1124 }
1125 EXPORT_SYMBOL(ib_process_mad_wc);
1126
1127 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1128                          struct ib_mad_reg_req *mad_reg_req)
1129 {
1130         int i;
1131
1132         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1133              i < IB_MGMT_MAX_METHODS;
1134              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1135                                1+i)) {
1136                 if ((*method)->agent[i]) {
1137                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1138                         return -EINVAL;
1139                 }
1140         }
1141         return 0;
1142 }
1143
1144 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1145 {
1146         /* Allocate management method table */
1147         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1148         if (!*method) {
1149                 printk(KERN_ERR PFX "No memory for "
1150                        "ib_mad_mgmt_method_table\n");
1151                 return -ENOMEM;
1152         }
1153
1154         return 0;
1155 }
1156
1157 /*
1158  * Check to see if there are any methods still in use
1159  */
1160 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1161 {
1162         int i;
1163
1164         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1165                 if (method->agent[i])
1166                         return 1;
1167         return 0;
1168 }
1169
1170 /*
1171  * Check to see if there are any method tables for this class still in use
1172  */
1173 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1174 {
1175         int i;
1176
1177         for (i = 0; i < MAX_MGMT_CLASS; i++)
1178                 if (class->method_table[i])
1179                         return 1;
1180         return 0;
1181 }
1182
1183 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1184 {
1185         int i;
1186
1187         for (i = 0; i < MAX_MGMT_OUI; i++)
1188                 if (vendor_class->method_table[i])
1189                         return 1;
1190         return 0;
1191 }
1192
1193 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1194                            char *oui)
1195 {
1196         int i;
1197
1198         for (i = 0; i < MAX_MGMT_OUI; i++)
1199                 /* Is there matching OUI for this vendor class ? */
1200                 if (!memcmp(vendor_class->oui[i], oui, 3))
1201                         return i;
1202
1203         return -1;
1204 }
1205
1206 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1207 {
1208         int i;
1209
1210         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1211                 if (vendor->vendor_class[i])
1212                         return 1;
1213
1214         return 0;
1215 }
1216
1217 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1218                                      struct ib_mad_agent_private *agent)
1219 {
1220         int i;
1221
1222         /* Remove any methods for this mad agent */
1223         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1224                 if (method->agent[i] == agent) {
1225                         method->agent[i] = NULL;
1226                 }
1227         }
1228 }
1229
1230 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1231                               struct ib_mad_agent_private *agent_priv,
1232                               u8 mgmt_class)
1233 {
1234         struct ib_mad_port_private *port_priv;
1235         struct ib_mad_mgmt_class_table **class;
1236         struct ib_mad_mgmt_method_table **method;
1237         int i, ret;
1238
1239         port_priv = agent_priv->qp_info->port_priv;
1240         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1241         if (!*class) {
1242                 /* Allocate management class table for "new" class version */
1243                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1244                 if (!*class) {
1245                         printk(KERN_ERR PFX "No memory for "
1246                                "ib_mad_mgmt_class_table\n");
1247                         ret = -ENOMEM;
1248                         goto error1;
1249                 }
1250
1251                 /* Allocate method table for this management class */
1252                 method = &(*class)->method_table[mgmt_class];
1253                 if ((ret = allocate_method_table(method)))
1254                         goto error2;
1255         } else {
1256                 method = &(*class)->method_table[mgmt_class];
1257                 if (!*method) {
1258                         /* Allocate method table for this management class */
1259                         if ((ret = allocate_method_table(method)))
1260                                 goto error1;
1261                 }
1262         }
1263
1264         /* Now, make sure methods are not already in use */
1265         if (method_in_use(method, mad_reg_req))
1266                 goto error3;
1267
1268         /* Finally, add in methods being registered */
1269         for (i = find_first_bit(mad_reg_req->method_mask,
1270                                 IB_MGMT_MAX_METHODS);
1271              i < IB_MGMT_MAX_METHODS;
1272              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1273                                1+i)) {
1274                 (*method)->agent[i] = agent_priv;
1275         }
1276         return 0;
1277
1278 error3:
1279         /* Remove any methods for this mad agent */
1280         remove_methods_mad_agent(*method, agent_priv);
1281         /* Now, check to see if there are any methods in use */
1282         if (!check_method_table(*method)) {
1283                 /* If not, release management method table */
1284                 kfree(*method);
1285                 *method = NULL;
1286         }
1287         ret = -EINVAL;
1288         goto error1;
1289 error2:
1290         kfree(*class);
1291         *class = NULL;
1292 error1:
1293         return ret;
1294 }
1295
1296 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1297                            struct ib_mad_agent_private *agent_priv)
1298 {
1299         struct ib_mad_port_private *port_priv;
1300         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1301         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1302         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1303         struct ib_mad_mgmt_method_table **method;
1304         int i, ret = -ENOMEM;
1305         u8 vclass;
1306
1307         /* "New" vendor (with OUI) class */
1308         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1309         port_priv = agent_priv->qp_info->port_priv;
1310         vendor_table = &port_priv->version[
1311                                 mad_reg_req->mgmt_class_version].vendor;
1312         if (!*vendor_table) {
1313                 /* Allocate mgmt vendor class table for "new" class version */
1314                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1315                 if (!vendor) {
1316                         printk(KERN_ERR PFX "No memory for "
1317                                "ib_mad_mgmt_vendor_class_table\n");
1318                         goto error1;
1319                 }
1320
1321                 *vendor_table = vendor;
1322         }
1323         if (!(*vendor_table)->vendor_class[vclass]) {
1324                 /* Allocate table for this management vendor class */
1325                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1326                 if (!vendor_class) {
1327                         printk(KERN_ERR PFX "No memory for "
1328                                "ib_mad_mgmt_vendor_class\n");
1329                         goto error2;
1330                 }
1331
1332                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1333         }
1334         for (i = 0; i < MAX_MGMT_OUI; i++) {
1335                 /* Is there matching OUI for this vendor class ? */
1336                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1337                             mad_reg_req->oui, 3)) {
1338                         method = &(*vendor_table)->vendor_class[
1339                                                 vclass]->method_table[i];
1340                         BUG_ON(!*method);
1341                         goto check_in_use;
1342                 }
1343         }
1344         for (i = 0; i < MAX_MGMT_OUI; i++) {
1345                 /* OUI slot available ? */
1346                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1347                                 vclass]->oui[i])) {
1348                         method = &(*vendor_table)->vendor_class[
1349                                 vclass]->method_table[i];
1350                         BUG_ON(*method);
1351                         /* Allocate method table for this OUI */
1352                         if ((ret = allocate_method_table(method)))
1353                                 goto error3;
1354                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1355                                mad_reg_req->oui, 3);
1356                         goto check_in_use;
1357                 }
1358         }
1359         printk(KERN_ERR PFX "All OUI slots in use\n");
1360         goto error3;
1361
1362 check_in_use:
1363         /* Now, make sure methods are not already in use */
1364         if (method_in_use(method, mad_reg_req))
1365                 goto error4;
1366
1367         /* Finally, add in methods being registered */
1368         for (i = find_first_bit(mad_reg_req->method_mask,
1369                                 IB_MGMT_MAX_METHODS);
1370              i < IB_MGMT_MAX_METHODS;
1371              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1372                                1+i)) {
1373                 (*method)->agent[i] = agent_priv;
1374         }
1375         return 0;
1376
1377 error4:
1378         /* Remove any methods for this mad agent */
1379         remove_methods_mad_agent(*method, agent_priv);
1380         /* Now, check to see if there are any methods in use */
1381         if (!check_method_table(*method)) {
1382                 /* If not, release management method table */
1383                 kfree(*method);
1384                 *method = NULL;
1385         }
1386         ret = -EINVAL;
1387 error3:
1388         if (vendor_class) {
1389                 (*vendor_table)->vendor_class[vclass] = NULL;
1390                 kfree(vendor_class);
1391         }
1392 error2:
1393         if (vendor) {
1394                 *vendor_table = NULL;
1395                 kfree(vendor);
1396         }
1397 error1:
1398         return ret;
1399 }
1400
1401 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1402 {
1403         struct ib_mad_port_private *port_priv;
1404         struct ib_mad_mgmt_class_table *class;
1405         struct ib_mad_mgmt_method_table *method;
1406         struct ib_mad_mgmt_vendor_class_table *vendor;
1407         struct ib_mad_mgmt_vendor_class *vendor_class;
1408         int index;
1409         u8 mgmt_class;
1410
1411         /*
1412          * Was MAD registration request supplied
1413          * with original registration ?
1414          */
1415         if (!agent_priv->reg_req) {
1416                 goto out;
1417         }
1418
1419         port_priv = agent_priv->qp_info->port_priv;
1420         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1421         class = port_priv->version[
1422                         agent_priv->reg_req->mgmt_class_version].class;
1423         if (!class)
1424                 goto vendor_check;
1425
1426         method = class->method_table[mgmt_class];
1427         if (method) {
1428                 /* Remove any methods for this mad agent */
1429                 remove_methods_mad_agent(method, agent_priv);
1430                 /* Now, check to see if there are any methods still in use */
1431                 if (!check_method_table(method)) {
1432                         /* If not, release management method table */
1433                          kfree(method);
1434                          class->method_table[mgmt_class] = NULL;
1435                          /* Any management classes left ? */
1436                         if (!check_class_table(class)) {
1437                                 /* If not, release management class table */
1438                                 kfree(class);
1439                                 port_priv->version[
1440                                         agent_priv->reg_req->
1441                                         mgmt_class_version].class = NULL;
1442                         }
1443                 }
1444         }
1445
1446 vendor_check:
1447         if (!is_vendor_class(mgmt_class))
1448                 goto out;
1449
1450         /* normalize mgmt_class to vendor range 2 */
1451         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1452         vendor = port_priv->version[
1453                         agent_priv->reg_req->mgmt_class_version].vendor;
1454
1455         if (!vendor)
1456                 goto out;
1457
1458         vendor_class = vendor->vendor_class[mgmt_class];
1459         if (vendor_class) {
1460                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1461                 if (index < 0)
1462                         goto out;
1463                 method = vendor_class->method_table[index];
1464                 if (method) {
1465                         /* Remove any methods for this mad agent */
1466                         remove_methods_mad_agent(method, agent_priv);
1467                         /*
1468                          * Now, check to see if there are
1469                          * any methods still in use
1470                          */
1471                         if (!check_method_table(method)) {
1472                                 /* If not, release management method table */
1473                                 kfree(method);
1474                                 vendor_class->method_table[index] = NULL;
1475                                 memset(vendor_class->oui[index], 0, 3);
1476                                 /* Any OUIs left ? */
1477                                 if (!check_vendor_class(vendor_class)) {
1478                                         /* If not, release vendor class table */
1479                                         kfree(vendor_class);
1480                                         vendor->vendor_class[mgmt_class] = NULL;
1481                                         /* Any other vendor classes left ? */
1482                                         if (!check_vendor_table(vendor)) {
1483                                                 kfree(vendor);
1484                                                 port_priv->version[
1485                                                         agent_priv->reg_req->
1486                                                         mgmt_class_version].
1487                                                         vendor = NULL;
1488                                         }
1489                                 }
1490                         }
1491                 }
1492         }
1493
1494 out:
1495         return;
1496 }
1497
1498 static struct ib_mad_agent_private *
1499 find_mad_agent(struct ib_mad_port_private *port_priv,
1500                struct ib_mad *mad)
1501 {
1502         struct ib_mad_agent_private *mad_agent = NULL;
1503         unsigned long flags;
1504
1505         spin_lock_irqsave(&port_priv->reg_lock, flags);
1506         if (response_mad(mad)) {
1507                 u32 hi_tid;
1508                 struct ib_mad_agent_private *entry;
1509
1510                 /*
1511                  * Routing is based on high 32 bits of transaction ID
1512                  * of MAD.
1513                  */
1514                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1515                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1516                         if (entry->agent.hi_tid == hi_tid) {
1517                                 mad_agent = entry;
1518                                 break;
1519                         }
1520                 }
1521         } else {
1522                 struct ib_mad_mgmt_class_table *class;
1523                 struct ib_mad_mgmt_method_table *method;
1524                 struct ib_mad_mgmt_vendor_class_table *vendor;
1525                 struct ib_mad_mgmt_vendor_class *vendor_class;
1526                 struct ib_vendor_mad *vendor_mad;
1527                 int index;
1528
1529                 /*
1530                  * Routing is based on version, class, and method
1531                  * For "newer" vendor MADs, also based on OUI
1532                  */
1533                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1534                         goto out;
1535                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1536                         class = port_priv->version[
1537                                         mad->mad_hdr.class_version].class;
1538                         if (!class)
1539                                 goto out;
1540                         method = class->method_table[convert_mgmt_class(
1541                                                         mad->mad_hdr.mgmt_class)];
1542                         if (method)
1543                                 mad_agent = method->agent[mad->mad_hdr.method &
1544                                                           ~IB_MGMT_METHOD_RESP];
1545                 } else {
1546                         vendor = port_priv->version[
1547                                         mad->mad_hdr.class_version].vendor;
1548                         if (!vendor)
1549                                 goto out;
1550                         vendor_class = vendor->vendor_class[vendor_class_index(
1551                                                 mad->mad_hdr.mgmt_class)];
1552                         if (!vendor_class)
1553                                 goto out;
1554                         /* Find matching OUI */
1555                         vendor_mad = (struct ib_vendor_mad *)mad;
1556                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1557                         if (index == -1)
1558                                 goto out;
1559                         method = vendor_class->method_table[index];
1560                         if (method) {
1561                                 mad_agent = method->agent[mad->mad_hdr.method &
1562                                                           ~IB_MGMT_METHOD_RESP];
1563                         }
1564                 }
1565         }
1566
1567         if (mad_agent) {
1568                 if (mad_agent->agent.recv_handler)
1569                         atomic_inc(&mad_agent->refcount);
1570                 else {
1571                         printk(KERN_NOTICE PFX "No receive handler for client "
1572                                "%p on port %d\n",
1573                                &mad_agent->agent, port_priv->port_num);
1574                         mad_agent = NULL;
1575                 }
1576         }
1577 out:
1578         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1579
1580         return mad_agent;
1581 }
1582
1583 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1584 {
1585         int valid = 0;
1586
1587         /* Make sure MAD base version is understood */
1588         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1589                 printk(KERN_ERR PFX "MAD received with unsupported base "
1590                        "version %d\n", mad->mad_hdr.base_version);
1591                 goto out;
1592         }
1593
1594         /* Filter SMI packets sent to other than QP0 */
1595         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1596             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1597                 if (qp_num == 0)
1598                         valid = 1;
1599         } else {
1600                 /* Filter GSI packets sent to QP0 */
1601                 if (qp_num != 0)
1602                         valid = 1;
1603         }
1604
1605 out:
1606         return valid;
1607 }
1608
1609 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1610                        struct ib_mad_hdr *mad_hdr)
1611 {
1612         struct ib_rmpp_mad *rmpp_mad;
1613
1614         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1615         return !mad_agent_priv->agent.rmpp_version ||
1616                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1617                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1618                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1619 }
1620
1621 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1622                                      struct ib_mad_recv_wc *rwc)
1623 {
1624         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1625                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1626 }
1627
1628 static inline int rcv_has_same_gid(struct ib_mad_send_wr_private *wr,
1629                                    struct ib_mad_recv_wc *rwc )
1630 {
1631         struct ib_ah_attr attr;
1632         u8 send_resp, rcv_resp;
1633
1634         send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1635                      mad_hdr.method & IB_MGMT_METHOD_RESP;
1636         rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1637
1638         if (!send_resp && rcv_resp)
1639                 /* is request/response. GID/LIDs are both local (same). */
1640                 return 1;
1641
1642         if (send_resp == rcv_resp)
1643                 /* both requests, or both responses. GIDs different */
1644                 return 0;
1645
1646         if (ib_query_ah(wr->send_buf.ah, &attr))
1647                 /* Assume not equal, to avoid false positives. */
1648                 return 0;
1649
1650         if (!(attr.ah_flags & IB_AH_GRH) && !(rwc->wc->wc_flags & IB_WC_GRH))
1651                 return attr.dlid == rwc->wc->slid;
1652         else if ((attr.ah_flags & IB_AH_GRH) &&
1653                  (rwc->wc->wc_flags & IB_WC_GRH))
1654                 return memcmp(attr.grh.dgid.raw,
1655                               rwc->recv_buf.grh->sgid.raw, 16) == 0;
1656         else
1657                 /* one has GID, other does not.  Assume different */
1658                 return 0;
1659 }
1660 struct ib_mad_send_wr_private*
1661 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1662                  struct ib_mad_recv_wc *mad_recv_wc)
1663 {
1664         struct ib_mad_send_wr_private *mad_send_wr;
1665         struct ib_mad *mad;
1666
1667         mad = (struct ib_mad *)mad_recv_wc->recv_buf.mad;
1668
1669         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1670                             agent_list) {
1671                 if ((mad_send_wr->tid == mad->mad_hdr.tid) &&
1672                     rcv_has_same_class(mad_send_wr, mad_recv_wc) &&
1673                     rcv_has_same_gid(mad_send_wr, mad_recv_wc))
1674                         return mad_send_wr;
1675         }
1676
1677         /*
1678          * It's possible to receive the response before we've
1679          * been notified that the send has completed
1680          */
1681         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1682                             agent_list) {
1683                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
1684                     mad_send_wr->tid == mad->mad_hdr.tid &&
1685                     mad_send_wr->timeout &&
1686                     rcv_has_same_class(mad_send_wr, mad_recv_wc) &&
1687                     rcv_has_same_gid(mad_send_wr, mad_recv_wc)) {
1688                         /* Verify request has not been canceled */
1689                         return (mad_send_wr->status == IB_WC_SUCCESS) ?
1690                                 mad_send_wr : NULL;
1691                 }
1692         }
1693         return NULL;
1694 }
1695
1696 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1697 {
1698         mad_send_wr->timeout = 0;
1699         if (mad_send_wr->refcount == 1) {
1700                 list_del(&mad_send_wr->agent_list);
1701                 list_add_tail(&mad_send_wr->agent_list,
1702                               &mad_send_wr->mad_agent_priv->done_list);
1703         }
1704 }
1705
1706 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1707                                  struct ib_mad_recv_wc *mad_recv_wc)
1708 {
1709         struct ib_mad_send_wr_private *mad_send_wr;
1710         struct ib_mad_send_wc mad_send_wc;
1711         unsigned long flags;
1712
1713         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1714         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1715         if (mad_agent_priv->agent.rmpp_version) {
1716                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1717                                                       mad_recv_wc);
1718                 if (!mad_recv_wc) {
1719                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1720                                 wake_up(&mad_agent_priv->wait);
1721                         return;
1722                 }
1723         }
1724
1725         /* Complete corresponding request */
1726         if (response_mad(mad_recv_wc->recv_buf.mad)) {
1727                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1728                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1729                 if (!mad_send_wr) {
1730                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1731                         ib_free_recv_mad(mad_recv_wc);
1732                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1733                                 wake_up(&mad_agent_priv->wait);
1734                         return;
1735                 }
1736                 ib_mark_mad_done(mad_send_wr);
1737                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1738
1739                 /* Defined behavior is to complete response before request */
1740                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1741                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1742                                                    mad_recv_wc);
1743                 atomic_dec(&mad_agent_priv->refcount);
1744
1745                 mad_send_wc.status = IB_WC_SUCCESS;
1746                 mad_send_wc.vendor_err = 0;
1747                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1748                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1749         } else {
1750                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1751                                                    mad_recv_wc);
1752                 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1753                         wake_up(&mad_agent_priv->wait);
1754         }
1755 }
1756
1757 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1758                                      struct ib_wc *wc)
1759 {
1760         struct ib_mad_qp_info *qp_info;
1761         struct ib_mad_private_header *mad_priv_hdr;
1762         struct ib_mad_private *recv, *response;
1763         struct ib_mad_list_head *mad_list;
1764         struct ib_mad_agent_private *mad_agent;
1765
1766         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1767         if (!response)
1768                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1769                        "for response buffer\n");
1770
1771         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1772         qp_info = mad_list->mad_queue->qp_info;
1773         dequeue_mad(mad_list);
1774
1775         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1776                                     mad_list);
1777         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1778         dma_unmap_single(port_priv->device->dma_device,
1779                          pci_unmap_addr(&recv->header, mapping),
1780                          sizeof(struct ib_mad_private) -
1781                          sizeof(struct ib_mad_private_header),
1782                          DMA_FROM_DEVICE);
1783
1784         /* Setup MAD receive work completion from "normal" work completion */
1785         recv->header.wc = *wc;
1786         recv->header.recv_wc.wc = &recv->header.wc;
1787         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1788         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1789         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1790
1791         if (atomic_read(&qp_info->snoop_count))
1792                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1793
1794         /* Validate MAD */
1795         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1796                 goto out;
1797
1798         if (recv->mad.mad.mad_hdr.mgmt_class ==
1799             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1800                 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1801                                             port_priv->device->node_type,
1802                                             port_priv->port_num,
1803                                             port_priv->device->phys_port_cnt))
1804                         goto out;
1805                 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1806                         goto local;
1807                 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1808                                             port_priv->device->node_type,
1809                                             port_priv->port_num))
1810                         goto out;
1811                 if (!smi_check_local_smp(&recv->mad.smp, port_priv->device))
1812                         goto out;
1813         }
1814
1815 local:
1816         /* Give driver "right of first refusal" on incoming MAD */
1817         if (port_priv->device->process_mad) {
1818                 int ret;
1819
1820                 if (!response) {
1821                         printk(KERN_ERR PFX "No memory for response MAD\n");
1822                         /*
1823                          * Is it better to assume that
1824                          * it wouldn't be processed ?
1825                          */
1826                         goto out;
1827                 }
1828
1829                 ret = port_priv->device->process_mad(port_priv->device, 0,
1830                                                      port_priv->port_num,
1831                                                      wc, &recv->grh,
1832                                                      &recv->mad.mad,
1833                                                      &response->mad.mad);
1834                 if (ret & IB_MAD_RESULT_SUCCESS) {
1835                         if (ret & IB_MAD_RESULT_CONSUMED)
1836                                 goto out;
1837                         if (ret & IB_MAD_RESULT_REPLY) {
1838                                 agent_send_response(&response->mad.mad,
1839                                                     &recv->grh, wc,
1840                                                     port_priv->device,
1841                                                     port_priv->port_num,
1842                                                     qp_info->qp->qp_num);
1843                                 goto out;
1844                         }
1845                 }
1846         }
1847
1848         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1849         if (mad_agent) {
1850                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1851                 /*
1852                  * recv is freed up in error cases in ib_mad_complete_recv
1853                  * or via recv_handler in ib_mad_complete_recv()
1854                  */
1855                 recv = NULL;
1856         }
1857
1858 out:
1859         /* Post another receive request for this QP */
1860         if (response) {
1861                 ib_mad_post_receive_mads(qp_info, response);
1862                 if (recv)
1863                         kmem_cache_free(ib_mad_cache, recv);
1864         } else
1865                 ib_mad_post_receive_mads(qp_info, recv);
1866 }
1867
1868 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1869 {
1870         struct ib_mad_send_wr_private *mad_send_wr;
1871         unsigned long delay;
1872
1873         if (list_empty(&mad_agent_priv->wait_list)) {
1874                 cancel_delayed_work(&mad_agent_priv->timed_work);
1875         } else {
1876                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1877                                          struct ib_mad_send_wr_private,
1878                                          agent_list);
1879
1880                 if (time_after(mad_agent_priv->timeout,
1881                                mad_send_wr->timeout)) {
1882                         mad_agent_priv->timeout = mad_send_wr->timeout;
1883                         cancel_delayed_work(&mad_agent_priv->timed_work);
1884                         delay = mad_send_wr->timeout - jiffies;
1885                         if ((long)delay <= 0)
1886                                 delay = 1;
1887                         queue_delayed_work(mad_agent_priv->qp_info->
1888                                            port_priv->wq,
1889                                            &mad_agent_priv->timed_work, delay);
1890                 }
1891         }
1892 }
1893
1894 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1895 {
1896         struct ib_mad_agent_private *mad_agent_priv;
1897         struct ib_mad_send_wr_private *temp_mad_send_wr;
1898         struct list_head *list_item;
1899         unsigned long delay;
1900
1901         mad_agent_priv = mad_send_wr->mad_agent_priv;
1902         list_del(&mad_send_wr->agent_list);
1903
1904         delay = mad_send_wr->timeout;
1905         mad_send_wr->timeout += jiffies;
1906
1907         if (delay) {
1908                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1909                         temp_mad_send_wr = list_entry(list_item,
1910                                                 struct ib_mad_send_wr_private,
1911                                                 agent_list);
1912                         if (time_after(mad_send_wr->timeout,
1913                                        temp_mad_send_wr->timeout))
1914                                 break;
1915                 }
1916         }
1917         else
1918                 list_item = &mad_agent_priv->wait_list;
1919         list_add(&mad_send_wr->agent_list, list_item);
1920
1921         /* Reschedule a work item if we have a shorter timeout */
1922         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1923                 cancel_delayed_work(&mad_agent_priv->timed_work);
1924                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1925                                    &mad_agent_priv->timed_work, delay);
1926         }
1927 }
1928
1929 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1930                           int timeout_ms)
1931 {
1932         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1933         wait_for_response(mad_send_wr);
1934 }
1935
1936 /*
1937  * Process a send work completion
1938  */
1939 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1940                              struct ib_mad_send_wc *mad_send_wc)
1941 {
1942         struct ib_mad_agent_private     *mad_agent_priv;
1943         unsigned long                   flags;
1944         int                             ret;
1945
1946         mad_agent_priv = mad_send_wr->mad_agent_priv;
1947         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1948         if (mad_agent_priv->agent.rmpp_version) {
1949                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1950                 if (ret == IB_RMPP_RESULT_CONSUMED)
1951                         goto done;
1952         } else
1953                 ret = IB_RMPP_RESULT_UNHANDLED;
1954
1955         if (mad_send_wc->status != IB_WC_SUCCESS &&
1956             mad_send_wr->status == IB_WC_SUCCESS) {
1957                 mad_send_wr->status = mad_send_wc->status;
1958                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1959         }
1960
1961         if (--mad_send_wr->refcount > 0) {
1962                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1963                     mad_send_wr->status == IB_WC_SUCCESS) {
1964                         wait_for_response(mad_send_wr);
1965                 }
1966                 goto done;
1967         }
1968
1969         /* Remove send from MAD agent and notify client of completion */
1970         list_del(&mad_send_wr->agent_list);
1971         adjust_timeout(mad_agent_priv);
1972         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1973
1974         if (mad_send_wr->status != IB_WC_SUCCESS )
1975                 mad_send_wc->status = mad_send_wr->status;
1976         if (ret == IB_RMPP_RESULT_INTERNAL)
1977                 ib_rmpp_send_handler(mad_send_wc);
1978         else
1979                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1980                                                    mad_send_wc);
1981
1982         /* Release reference on agent taken when sending */
1983         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1984                 wake_up(&mad_agent_priv->wait);
1985         return;
1986 done:
1987         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1988 }
1989
1990 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1991                                      struct ib_wc *wc)
1992 {
1993         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
1994         struct ib_mad_list_head         *mad_list;
1995         struct ib_mad_qp_info           *qp_info;
1996         struct ib_mad_queue             *send_queue;
1997         struct ib_send_wr               *bad_send_wr;
1998         struct ib_mad_send_wc           mad_send_wc;
1999         unsigned long flags;
2000         int ret;
2001
2002         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2003         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2004                                    mad_list);
2005         send_queue = mad_list->mad_queue;
2006         qp_info = send_queue->qp_info;
2007
2008 retry:
2009         dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
2010                          pci_unmap_addr(mad_send_wr, header_mapping),
2011                          mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2012         dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
2013                          pci_unmap_addr(mad_send_wr, payload_mapping),
2014                          mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2015         queued_send_wr = NULL;
2016         spin_lock_irqsave(&send_queue->lock, flags);
2017         list_del(&mad_list->list);
2018
2019         /* Move queued send to the send queue */
2020         if (send_queue->count-- > send_queue->max_active) {
2021                 mad_list = container_of(qp_info->overflow_list.next,
2022                                         struct ib_mad_list_head, list);
2023                 queued_send_wr = container_of(mad_list,
2024                                         struct ib_mad_send_wr_private,
2025                                         mad_list);
2026                 list_del(&mad_list->list);
2027                 list_add_tail(&mad_list->list, &send_queue->list);
2028         }
2029         spin_unlock_irqrestore(&send_queue->lock, flags);
2030
2031         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2032         mad_send_wc.status = wc->status;
2033         mad_send_wc.vendor_err = wc->vendor_err;
2034         if (atomic_read(&qp_info->snoop_count))
2035                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2036                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2037         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2038
2039         if (queued_send_wr) {
2040                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2041                                    &bad_send_wr);
2042                 if (ret) {
2043                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2044                         mad_send_wr = queued_send_wr;
2045                         wc->status = IB_WC_LOC_QP_OP_ERR;
2046                         goto retry;
2047                 }
2048         }
2049 }
2050
2051 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2052 {
2053         struct ib_mad_send_wr_private *mad_send_wr;
2054         struct ib_mad_list_head *mad_list;
2055         unsigned long flags;
2056
2057         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2058         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2059                 mad_send_wr = container_of(mad_list,
2060                                            struct ib_mad_send_wr_private,
2061                                            mad_list);
2062                 mad_send_wr->retry = 1;
2063         }
2064         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2065 }
2066
2067 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2068                               struct ib_wc *wc)
2069 {
2070         struct ib_mad_list_head *mad_list;
2071         struct ib_mad_qp_info *qp_info;
2072         struct ib_mad_send_wr_private *mad_send_wr;
2073         int ret;
2074
2075         /* Determine if failure was a send or receive */
2076         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2077         qp_info = mad_list->mad_queue->qp_info;
2078         if (mad_list->mad_queue == &qp_info->recv_queue)
2079                 /*
2080                  * Receive errors indicate that the QP has entered the error
2081                  * state - error handling/shutdown code will cleanup
2082                  */
2083                 return;
2084
2085         /*
2086          * Send errors will transition the QP to SQE - move
2087          * QP to RTS and repost flushed work requests
2088          */
2089         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2090                                    mad_list);
2091         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2092                 if (mad_send_wr->retry) {
2093                         /* Repost send */
2094                         struct ib_send_wr *bad_send_wr;
2095
2096                         mad_send_wr->retry = 0;
2097                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2098                                         &bad_send_wr);
2099                         if (ret)
2100                                 ib_mad_send_done_handler(port_priv, wc);
2101                 } else
2102                         ib_mad_send_done_handler(port_priv, wc);
2103         } else {
2104                 struct ib_qp_attr *attr;
2105
2106                 /* Transition QP to RTS and fail offending send */
2107                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2108                 if (attr) {
2109                         attr->qp_state = IB_QPS_RTS;
2110                         attr->cur_qp_state = IB_QPS_SQE;
2111                         ret = ib_modify_qp(qp_info->qp, attr,
2112                                            IB_QP_STATE | IB_QP_CUR_STATE);
2113                         kfree(attr);
2114                         if (ret)
2115                                 printk(KERN_ERR PFX "mad_error_handler - "
2116                                        "ib_modify_qp to RTS : %d\n", ret);
2117                         else
2118                                 mark_sends_for_retry(qp_info);
2119                 }
2120                 ib_mad_send_done_handler(port_priv, wc);
2121         }
2122 }
2123
2124 /*
2125  * IB MAD completion callback
2126  */
2127 static void ib_mad_completion_handler(void *data)
2128 {
2129         struct ib_mad_port_private *port_priv;
2130         struct ib_wc wc;
2131
2132         port_priv = (struct ib_mad_port_private *)data;
2133         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2134
2135         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2136                 if (wc.status == IB_WC_SUCCESS) {
2137                         switch (wc.opcode) {
2138                         case IB_WC_SEND:
2139                                 ib_mad_send_done_handler(port_priv, &wc);
2140                                 break;
2141                         case IB_WC_RECV:
2142                                 ib_mad_recv_done_handler(port_priv, &wc);
2143                                 break;
2144                         default:
2145                                 BUG_ON(1);
2146                                 break;
2147                         }
2148                 } else
2149                         mad_error_handler(port_priv, &wc);
2150         }
2151 }
2152
2153 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2154 {
2155         unsigned long flags;
2156         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2157         struct ib_mad_send_wc mad_send_wc;
2158         struct list_head cancel_list;
2159
2160         INIT_LIST_HEAD(&cancel_list);
2161
2162         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2163         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2164                                  &mad_agent_priv->send_list, agent_list) {
2165                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2166                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2167                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2168                 }
2169         }
2170
2171         /* Empty wait list to prevent receives from finding a request */
2172         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2173         /* Empty local completion list as well */
2174         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2175         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2176
2177         /* Report all cancelled requests */
2178         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2179         mad_send_wc.vendor_err = 0;
2180
2181         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2182                                  &cancel_list, agent_list) {
2183                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2184                 list_del(&mad_send_wr->agent_list);
2185                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2186                                                    &mad_send_wc);
2187                 atomic_dec(&mad_agent_priv->refcount);
2188         }
2189 }
2190
2191 static struct ib_mad_send_wr_private*
2192 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2193              struct ib_mad_send_buf *send_buf)
2194 {
2195         struct ib_mad_send_wr_private *mad_send_wr;
2196
2197         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2198                             agent_list) {
2199                 if (&mad_send_wr->send_buf == send_buf)
2200                         return mad_send_wr;
2201         }
2202
2203         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2204                             agent_list) {
2205                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2206                     &mad_send_wr->send_buf == send_buf)
2207                         return mad_send_wr;
2208         }
2209         return NULL;
2210 }
2211
2212 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2213                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2214 {
2215         struct ib_mad_agent_private *mad_agent_priv;
2216         struct ib_mad_send_wr_private *mad_send_wr;
2217         unsigned long flags;
2218         int active;
2219
2220         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2221                                       agent);
2222         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2223         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2224         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2225                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2226                 return -EINVAL;
2227         }
2228
2229         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2230         if (!timeout_ms) {
2231                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2232                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2233         }
2234
2235         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2236         if (active)
2237                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2238         else
2239                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2240
2241         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2242         return 0;
2243 }
2244 EXPORT_SYMBOL(ib_modify_mad);
2245
2246 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2247                    struct ib_mad_send_buf *send_buf)
2248 {
2249         ib_modify_mad(mad_agent, send_buf, 0);
2250 }
2251 EXPORT_SYMBOL(ib_cancel_mad);
2252
2253 static void local_completions(void *data)
2254 {
2255         struct ib_mad_agent_private *mad_agent_priv;
2256         struct ib_mad_local_private *local;
2257         struct ib_mad_agent_private *recv_mad_agent;
2258         unsigned long flags;
2259         int recv = 0;
2260         struct ib_wc wc;
2261         struct ib_mad_send_wc mad_send_wc;
2262
2263         mad_agent_priv = (struct ib_mad_agent_private *)data;
2264
2265         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2266         while (!list_empty(&mad_agent_priv->local_list)) {
2267                 local = list_entry(mad_agent_priv->local_list.next,
2268                                    struct ib_mad_local_private,
2269                                    completion_list);
2270                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2271                 if (local->mad_priv) {
2272                         recv_mad_agent = local->recv_mad_agent;
2273                         if (!recv_mad_agent) {
2274                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2275                                 goto local_send_completion;
2276                         }
2277
2278                         recv = 1;
2279                         /*
2280                          * Defined behavior is to complete response
2281                          * before request
2282                          */
2283                         build_smp_wc((unsigned long) local->mad_send_wr,
2284                                      be16_to_cpu(IB_LID_PERMISSIVE),
2285                                      0, recv_mad_agent->agent.port_num, &wc);
2286
2287                         local->mad_priv->header.recv_wc.wc = &wc;
2288                         local->mad_priv->header.recv_wc.mad_len =
2289                                                 sizeof(struct ib_mad);
2290                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2291                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2292                                  &local->mad_priv->header.recv_wc.rmpp_list);
2293                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2294                         local->mad_priv->header.recv_wc.recv_buf.mad =
2295                                                 &local->mad_priv->mad.mad;
2296                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2297                                 snoop_recv(recv_mad_agent->qp_info,
2298                                           &local->mad_priv->header.recv_wc,
2299                                            IB_MAD_SNOOP_RECVS);
2300                         recv_mad_agent->agent.recv_handler(
2301                                                 &recv_mad_agent->agent,
2302                                                 &local->mad_priv->header.recv_wc);
2303                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2304                         atomic_dec(&recv_mad_agent->refcount);
2305                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2306                 }
2307
2308 local_send_completion:
2309                 /* Complete send */
2310                 mad_send_wc.status = IB_WC_SUCCESS;
2311                 mad_send_wc.vendor_err = 0;
2312                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2313                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2314                         snoop_send(mad_agent_priv->qp_info,
2315                                    &local->mad_send_wr->send_buf,
2316                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2317                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2318                                                    &mad_send_wc);
2319
2320                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2321                 list_del(&local->completion_list);
2322                 atomic_dec(&mad_agent_priv->refcount);
2323                 if (!recv)
2324                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2325                 kfree(local);
2326         }
2327         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2328 }
2329
2330 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2331 {
2332         int ret;
2333
2334         if (!mad_send_wr->retries--)
2335                 return -ETIMEDOUT;
2336
2337         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2338
2339         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2340                 ret = ib_retry_rmpp(mad_send_wr);
2341                 switch (ret) {
2342                 case IB_RMPP_RESULT_UNHANDLED:
2343                         ret = ib_send_mad(mad_send_wr);
2344                         break;
2345                 case IB_RMPP_RESULT_CONSUMED:
2346                         ret = 0;
2347                         break;
2348                 default:
2349                         ret = -ECOMM;
2350                         break;
2351                 }
2352         } else
2353                 ret = ib_send_mad(mad_send_wr);
2354
2355         if (!ret) {
2356                 mad_send_wr->refcount++;
2357                 list_add_tail(&mad_send_wr->agent_list,
2358                               &mad_send_wr->mad_agent_priv->send_list);
2359         }
2360         return ret;
2361 }
2362
2363 static void timeout_sends(void *data)
2364 {
2365         struct ib_mad_agent_private *mad_agent_priv;
2366         struct ib_mad_send_wr_private *mad_send_wr;
2367         struct ib_mad_send_wc mad_send_wc;
2368         unsigned long flags, delay;
2369
2370         mad_agent_priv = (struct ib_mad_agent_private *)data;
2371         mad_send_wc.vendor_err = 0;
2372
2373         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2374         while (!list_empty(&mad_agent_priv->wait_list)) {
2375                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2376                                          struct ib_mad_send_wr_private,
2377                                          agent_list);
2378
2379                 if (time_after(mad_send_wr->timeout, jiffies)) {
2380                         delay = mad_send_wr->timeout - jiffies;
2381                         if ((long)delay <= 0)
2382                                 delay = 1;
2383                         queue_delayed_work(mad_agent_priv->qp_info->
2384                                            port_priv->wq,
2385                                            &mad_agent_priv->timed_work, delay);
2386                         break;
2387                 }
2388
2389                 list_del(&mad_send_wr->agent_list);
2390                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2391                     !retry_send(mad_send_wr))
2392                         continue;
2393
2394                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2395
2396                 if (mad_send_wr->status == IB_WC_SUCCESS)
2397                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2398                 else
2399                         mad_send_wc.status = mad_send_wr->status;
2400                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2401                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2402                                                    &mad_send_wc);
2403
2404                 atomic_dec(&mad_agent_priv->refcount);
2405                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2406         }
2407         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2408 }
2409
2410 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2411 {
2412         struct ib_mad_port_private *port_priv = cq->cq_context;
2413         unsigned long flags;
2414
2415         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2416         if (!list_empty(&port_priv->port_list))
2417                 queue_work(port_priv->wq, &port_priv->work);
2418         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2419 }
2420
2421 /*
2422  * Allocate receive MADs and post receive WRs for them
2423  */
2424 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2425                                     struct ib_mad_private *mad)
2426 {
2427         unsigned long flags;
2428         int post, ret;
2429         struct ib_mad_private *mad_priv;
2430         struct ib_sge sg_list;
2431         struct ib_recv_wr recv_wr, *bad_recv_wr;
2432         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2433
2434         /* Initialize common scatter list fields */
2435         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2436         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2437
2438         /* Initialize common receive WR fields */
2439         recv_wr.next = NULL;
2440         recv_wr.sg_list = &sg_list;
2441         recv_wr.num_sge = 1;
2442
2443         do {
2444                 /* Allocate and map receive buffer */
2445                 if (mad) {
2446                         mad_priv = mad;
2447                         mad = NULL;
2448                 } else {
2449                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2450                         if (!mad_priv) {
2451                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2452                                 ret = -ENOMEM;
2453                                 break;
2454                         }
2455                 }
2456                 sg_list.addr = dma_map_single(qp_info->port_priv->
2457                                                 device->dma_device,
2458                                         &mad_priv->grh,
2459                                         sizeof *mad_priv -
2460                                                 sizeof mad_priv->header,
2461                                         DMA_FROM_DEVICE);
2462                 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2463                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2464                 mad_priv->header.mad_list.mad_queue = recv_queue;
2465
2466                 /* Post receive WR */
2467                 spin_lock_irqsave(&recv_queue->lock, flags);
2468                 post = (++recv_queue->count < recv_queue->max_active);
2469                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2470                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2471                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2472                 if (ret) {
2473                         spin_lock_irqsave(&recv_queue->lock, flags);
2474                         list_del(&mad_priv->header.mad_list.list);
2475                         recv_queue->count--;
2476                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2477                         dma_unmap_single(qp_info->port_priv->device->dma_device,
2478                                          pci_unmap_addr(&mad_priv->header,
2479                                                         mapping),
2480                                          sizeof *mad_priv -
2481                                            sizeof mad_priv->header,
2482                                          DMA_FROM_DEVICE);
2483                         kmem_cache_free(ib_mad_cache, mad_priv);
2484                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2485                         break;
2486                 }
2487         } while (post);
2488
2489         return ret;
2490 }
2491
2492 /*
2493  * Return all the posted receive MADs
2494  */
2495 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2496 {
2497         struct ib_mad_private_header *mad_priv_hdr;
2498         struct ib_mad_private *recv;
2499         struct ib_mad_list_head *mad_list;
2500
2501         while (!list_empty(&qp_info->recv_queue.list)) {
2502
2503                 mad_list = list_entry(qp_info->recv_queue.list.next,
2504                                       struct ib_mad_list_head, list);
2505                 mad_priv_hdr = container_of(mad_list,
2506                                             struct ib_mad_private_header,
2507                                             mad_list);
2508                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2509                                     header);
2510
2511                 /* Remove from posted receive MAD list */
2512                 list_del(&mad_list->list);
2513
2514                 dma_unmap_single(qp_info->port_priv->device->dma_device,
2515                                  pci_unmap_addr(&recv->header, mapping),
2516                                  sizeof(struct ib_mad_private) -
2517                                  sizeof(struct ib_mad_private_header),
2518                                  DMA_FROM_DEVICE);
2519                 kmem_cache_free(ib_mad_cache, recv);
2520         }
2521
2522         qp_info->recv_queue.count = 0;
2523 }
2524
2525 /*
2526  * Start the port
2527  */
2528 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2529 {
2530         int ret, i;
2531         struct ib_qp_attr *attr;
2532         struct ib_qp *qp;
2533
2534         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2535         if (!attr) {
2536                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2537                 return -ENOMEM;
2538         }
2539
2540         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2541                 qp = port_priv->qp_info[i].qp;
2542                 /*
2543                  * PKey index for QP1 is irrelevant but
2544                  * one is needed for the Reset to Init transition
2545                  */
2546                 attr->qp_state = IB_QPS_INIT;
2547                 attr->pkey_index = 0;
2548                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2549                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2550                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2551                 if (ret) {
2552                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2553                                "INIT: %d\n", i, ret);
2554                         goto out;
2555                 }
2556
2557                 attr->qp_state = IB_QPS_RTR;
2558                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2559                 if (ret) {
2560                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2561                                "RTR: %d\n", i, ret);
2562                         goto out;
2563                 }
2564
2565                 attr->qp_state = IB_QPS_RTS;
2566                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2567                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2568                 if (ret) {
2569                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2570                                "RTS: %d\n", i, ret);
2571                         goto out;
2572                 }
2573         }
2574
2575         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2576         if (ret) {
2577                 printk(KERN_ERR PFX "Failed to request completion "
2578                        "notification: %d\n", ret);
2579                 goto out;
2580         }
2581
2582         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2583                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2584                 if (ret) {
2585                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2586                         goto out;
2587                 }
2588         }
2589 out:
2590         kfree(attr);
2591         return ret;
2592 }
2593
2594 static void qp_event_handler(struct ib_event *event, void *qp_context)
2595 {
2596         struct ib_mad_qp_info   *qp_info = qp_context;
2597
2598         /* It's worse than that! He's dead, Jim! */
2599         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2600                 event->event, qp_info->qp->qp_num);
2601 }
2602
2603 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2604                            struct ib_mad_queue *mad_queue)
2605 {
2606         mad_queue->qp_info = qp_info;
2607         mad_queue->count = 0;
2608         spin_lock_init(&mad_queue->lock);
2609         INIT_LIST_HEAD(&mad_queue->list);
2610 }
2611
2612 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2613                         struct ib_mad_qp_info *qp_info)
2614 {
2615         qp_info->port_priv = port_priv;
2616         init_mad_queue(qp_info, &qp_info->send_queue);
2617         init_mad_queue(qp_info, &qp_info->recv_queue);
2618         INIT_LIST_HEAD(&qp_info->overflow_list);
2619         spin_lock_init(&qp_info->snoop_lock);
2620         qp_info->snoop_table = NULL;
2621         qp_info->snoop_table_size = 0;
2622         atomic_set(&qp_info->snoop_count, 0);
2623 }
2624
2625 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2626                          enum ib_qp_type qp_type)
2627 {
2628         struct ib_qp_init_attr  qp_init_attr;
2629         int ret;
2630
2631         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2632         qp_init_attr.send_cq = qp_info->port_priv->cq;
2633         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2634         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2635         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2636         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2637         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2638         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2639         qp_init_attr.qp_type = qp_type;
2640         qp_init_attr.port_num = qp_info->port_priv->port_num;
2641         qp_init_attr.qp_context = qp_info;
2642         qp_init_attr.event_handler = qp_event_handler;
2643         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2644         if (IS_ERR(qp_info->qp)) {
2645                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2646                        get_spl_qp_index(qp_type));
2647                 ret = PTR_ERR(qp_info->qp);
2648                 goto error;
2649         }
2650         /* Use minimum queue sizes unless the CQ is resized */
2651         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2652         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2653         return 0;
2654
2655 error:
2656         return ret;
2657 }
2658
2659 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2660 {
2661         ib_destroy_qp(qp_info->qp);
2662         kfree(qp_info->snoop_table);
2663 }
2664
2665 /*
2666  * Open the port
2667  * Create the QP, PD, MR, and CQ if needed
2668  */
2669 static int ib_mad_port_open(struct ib_device *device,
2670                             int port_num)
2671 {
2672         int ret, cq_size;
2673         struct ib_mad_port_private *port_priv;
2674         unsigned long flags;
2675         char name[sizeof "ib_mad123"];
2676
2677         /* Create new device info */
2678         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2679         if (!port_priv) {
2680                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2681                 return -ENOMEM;
2682         }
2683
2684         port_priv->device = device;
2685         port_priv->port_num = port_num;
2686         spin_lock_init(&port_priv->reg_lock);
2687         INIT_LIST_HEAD(&port_priv->agent_list);
2688         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2689         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2690
2691         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2692         port_priv->cq = ib_create_cq(port_priv->device,
2693                                      ib_mad_thread_completion_handler,
2694                                      NULL, port_priv, cq_size);
2695         if (IS_ERR(port_priv->cq)) {
2696                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2697                 ret = PTR_ERR(port_priv->cq);
2698                 goto error3;
2699         }
2700
2701         port_priv->pd = ib_alloc_pd(device);
2702         if (IS_ERR(port_priv->pd)) {
2703                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2704                 ret = PTR_ERR(port_priv->pd);
2705                 goto error4;
2706         }
2707
2708         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2709         if (IS_ERR(port_priv->mr)) {
2710                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2711                 ret = PTR_ERR(port_priv->mr);
2712                 goto error5;
2713         }
2714
2715         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2716         if (ret)
2717                 goto error6;
2718         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2719         if (ret)
2720                 goto error7;
2721
2722         snprintf(name, sizeof name, "ib_mad%d", port_num);
2723         port_priv->wq = create_singlethread_workqueue(name);
2724         if (!port_priv->wq) {
2725                 ret = -ENOMEM;
2726                 goto error8;
2727         }
2728         INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2729
2730         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2731         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2732         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2733
2734         ret = ib_mad_port_start(port_priv);
2735         if (ret) {
2736                 printk(KERN_ERR PFX "Couldn't start port\n");
2737                 goto error9;
2738         }
2739
2740         return 0;
2741
2742 error9:
2743         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2744         list_del_init(&port_priv->port_list);
2745         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2746
2747         destroy_workqueue(port_priv->wq);
2748 error8:
2749         destroy_mad_qp(&port_priv->qp_info[1]);
2750 error7:
2751         destroy_mad_qp(&port_priv->qp_info[0]);
2752 error6:
2753         ib_dereg_mr(port_priv->mr);
2754 error5:
2755         ib_dealloc_pd(port_priv->pd);
2756 error4:
2757         ib_destroy_cq(port_priv->cq);
2758         cleanup_recv_queue(&port_priv->qp_info[1]);
2759         cleanup_recv_queue(&port_priv->qp_info[0]);
2760 error3:
2761         kfree(port_priv);
2762
2763         return ret;
2764 }
2765
2766 /*
2767  * Close the port
2768  * If there are no classes using the port, free the port
2769  * resources (CQ, MR, PD, QP) and remove the port's info structure
2770  */
2771 static int ib_mad_port_close(struct ib_device *device, int port_num)
2772 {
2773         struct ib_mad_port_private *port_priv;
2774         unsigned long flags;
2775
2776         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2777         port_priv = __ib_get_mad_port(device, port_num);
2778         if (port_priv == NULL) {
2779                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2780                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2781                 return -ENODEV;
2782         }
2783         list_del_init(&port_priv->port_list);
2784         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2785
2786         destroy_workqueue(port_priv->wq);
2787         destroy_mad_qp(&port_priv->qp_info[1]);
2788         destroy_mad_qp(&port_priv->qp_info[0]);
2789         ib_dereg_mr(port_priv->mr);
2790         ib_dealloc_pd(port_priv->pd);
2791         ib_destroy_cq(port_priv->cq);
2792         cleanup_recv_queue(&port_priv->qp_info[1]);
2793         cleanup_recv_queue(&port_priv->qp_info[0]);
2794         /* XXX: Handle deallocation of MAD registration tables */
2795
2796         kfree(port_priv);
2797
2798         return 0;
2799 }
2800
2801 static void ib_mad_init_device(struct ib_device *device)
2802 {
2803         int start, end, i;
2804
2805         if (device->node_type == IB_NODE_SWITCH) {
2806                 start = 0;
2807                 end   = 0;
2808         } else {
2809                 start = 1;
2810                 end   = device->phys_port_cnt;
2811         }
2812
2813         for (i = start; i <= end; i++) {
2814                 if (ib_mad_port_open(device, i)) {
2815                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2816                                device->name, i);
2817                         goto error;
2818                 }
2819                 if (ib_agent_port_open(device, i)) {
2820                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2821                                "for agents\n",
2822                                device->name, i);
2823                         goto error_agent;
2824                 }
2825         }
2826         return;
2827
2828 error_agent:
2829         if (ib_mad_port_close(device, i))
2830                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2831                        device->name, i);
2832
2833 error:
2834         i--;
2835
2836         while (i >= start) {
2837                 if (ib_agent_port_close(device, i))
2838                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2839                                "for agents\n",
2840                                device->name, i);
2841                 if (ib_mad_port_close(device, i))
2842                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2843                                device->name, i);
2844                 i--;
2845         }
2846 }
2847
2848 static void ib_mad_remove_device(struct ib_device *device)
2849 {
2850         int i, num_ports, cur_port;
2851
2852         if (device->node_type == IB_NODE_SWITCH) {
2853                 num_ports = 1;
2854                 cur_port = 0;
2855         } else {
2856                 num_ports = device->phys_port_cnt;
2857                 cur_port = 1;
2858         }
2859         for (i = 0; i < num_ports; i++, cur_port++) {
2860                 if (ib_agent_port_close(device, cur_port))
2861                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2862                                "for agents\n",
2863                                device->name, cur_port);
2864                 if (ib_mad_port_close(device, cur_port))
2865                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2866                                device->name, cur_port);
2867         }
2868 }
2869
2870 static struct ib_client mad_client = {
2871         .name   = "mad",
2872         .add = ib_mad_init_device,
2873         .remove = ib_mad_remove_device
2874 };
2875
2876 static int __init ib_mad_init_module(void)
2877 {
2878         int ret;
2879
2880         spin_lock_init(&ib_mad_port_list_lock);
2881
2882         ib_mad_cache = kmem_cache_create("ib_mad",
2883                                          sizeof(struct ib_mad_private),
2884                                          0,
2885                                          SLAB_HWCACHE_ALIGN,
2886                                          NULL,
2887                                          NULL);
2888         if (!ib_mad_cache) {
2889                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2890                 ret = -ENOMEM;
2891                 goto error1;
2892         }
2893
2894         INIT_LIST_HEAD(&ib_mad_port_list);
2895
2896         if (ib_register_client(&mad_client)) {
2897                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2898                 ret = -EINVAL;
2899                 goto error2;
2900         }
2901
2902         return 0;
2903
2904 error2:
2905         kmem_cache_destroy(ib_mad_cache);
2906 error1:
2907         return ret;
2908 }
2909
2910 static void __exit ib_mad_cleanup_module(void)
2911 {
2912         ib_unregister_client(&mad_client);
2913
2914         if (kmem_cache_destroy(ib_mad_cache)) {
2915                 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2916         }
2917 }
2918
2919 module_init(ib_mad_init_module);
2920 module_exit(ib_mad_cleanup_module);
2921