1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
5 * Copyright (c) 2005 Intel Corporation. All rights reserved.
6 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
7 * Copyright (c) 2009 HNR Consulting. All rights reserved.
8 * Copyright (c) 2014 Intel Corporation. All rights reserved.
9 *
10 * This software is available to you under a choice of one of two
11 * licenses. You may choose to be licensed under the terms of the GNU
12 * General Public License (GPL) Version 2, available from the file
13 * COPYING in the main directory of this source tree, or the
14 * OpenIB.org BSD license below:
15 *
16 * Redistribution and use in source and binary forms, with or
17 * without modification, are permitted provided that the following
18 * conditions are met:
19 *
20 * - Redistributions of source code must retain the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer.
23 *
24 * - Redistributions in binary form must reproduce the above
25 * copyright notice, this list of conditions and the following
26 * disclaimer in the documentation and/or other materials
27 * provided with the distribution.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 * SOFTWARE.
37 */
38
39 #include <sys/cdefs.h>
40 #define LINUXKPI_PARAM_PREFIX ibcore_
41 #define KBUILD_MODNAME "ibcore"
42
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45 #include <linux/dma-mapping.h>
46 #include <linux/slab.h>
47 #include <linux/module.h>
48 #include <rdma/ib_cache.h>
49
50 #include "mad_priv.h"
51 #include "mad_rmpp.h"
52 #include "smi.h"
53 #include "opa_smi.h"
54 #include "agent.h"
55 #include "core_priv.h"
56
57 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
58 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
59
60 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
61 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
62 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
63 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
64
65 static struct list_head ib_mad_port_list;
66 static u32 ib_mad_client_id = 0;
67
68 /* Port list lock */
69 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
70
71 /* Forward declarations */
72 static int method_in_use(struct ib_mad_mgmt_method_table **method,
73 struct ib_mad_reg_req *mad_reg_req);
74 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
75 static struct ib_mad_agent_private *find_mad_agent(
76 struct ib_mad_port_private *port_priv,
77 const struct ib_mad_hdr *mad);
78 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
79 struct ib_mad_private *mad);
80 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
81 static void timeout_sends(struct work_struct *work);
82 static void local_completions(struct work_struct *work);
83 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
84 struct ib_mad_agent_private *agent_priv,
85 u8 mgmt_class);
86 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
87 struct ib_mad_agent_private *agent_priv);
88 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
89 struct ib_wc *wc);
90 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
91
92 /*
93 * Returns a ib_mad_port_private structure or NULL for a device/port
94 * Assumes ib_mad_port_list_lock is being held
95 */
96 static inline struct ib_mad_port_private *
__ib_get_mad_port(struct ib_device * device,int port_num)97 __ib_get_mad_port(struct ib_device *device, int port_num)
98 {
99 struct ib_mad_port_private *entry;
100
101 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
102 if (entry->device == device && entry->port_num == port_num)
103 return entry;
104 }
105 return NULL;
106 }
107
108 /*
109 * Wrapper function to return a ib_mad_port_private structure or NULL
110 * for a device/port
111 */
112 static inline struct ib_mad_port_private *
ib_get_mad_port(struct ib_device * device,int port_num)113 ib_get_mad_port(struct ib_device *device, int port_num)
114 {
115 struct ib_mad_port_private *entry;
116 unsigned long flags;
117
118 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
119 entry = __ib_get_mad_port(device, port_num);
120 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
121
122 return entry;
123 }
124
convert_mgmt_class(u8 mgmt_class)125 static inline u8 convert_mgmt_class(u8 mgmt_class)
126 {
127 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
128 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
129 0 : mgmt_class;
130 }
131
get_spl_qp_index(enum ib_qp_type qp_type)132 static int get_spl_qp_index(enum ib_qp_type qp_type)
133 {
134 switch (qp_type)
135 {
136 case IB_QPT_SMI:
137 return 0;
138 case IB_QPT_GSI:
139 return 1;
140 default:
141 return -1;
142 }
143 }
144
vendor_class_index(u8 mgmt_class)145 static int vendor_class_index(u8 mgmt_class)
146 {
147 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
148 }
149
is_vendor_class(u8 mgmt_class)150 static int is_vendor_class(u8 mgmt_class)
151 {
152 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
153 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
154 return 0;
155 return 1;
156 }
157
is_vendor_oui(char * oui)158 static int is_vendor_oui(char *oui)
159 {
160 if (oui[0] || oui[1] || oui[2])
161 return 1;
162 return 0;
163 }
164
is_vendor_method_in_use(struct ib_mad_mgmt_vendor_class * vendor_class,struct ib_mad_reg_req * mad_reg_req)165 static int is_vendor_method_in_use(
166 struct ib_mad_mgmt_vendor_class *vendor_class,
167 struct ib_mad_reg_req *mad_reg_req)
168 {
169 struct ib_mad_mgmt_method_table *method;
170 int i;
171
172 for (i = 0; i < MAX_MGMT_OUI; i++) {
173 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
174 method = vendor_class->method_table[i];
175 if (method) {
176 if (method_in_use(&method, mad_reg_req))
177 return 1;
178 else
179 break;
180 }
181 }
182 }
183 return 0;
184 }
185
ib_response_mad(const struct ib_mad_hdr * hdr)186 int ib_response_mad(const struct ib_mad_hdr *hdr)
187 {
188 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
189 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
190 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
191 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
192 }
193 EXPORT_SYMBOL(ib_response_mad);
194
195 /*
196 * ib_register_mad_agent - Register to send/receive MADs
197 */
ib_register_mad_agent(struct ib_device * device,u8 port_num,enum ib_qp_type qp_type,struct ib_mad_reg_req * mad_reg_req,u8 rmpp_version,ib_mad_send_handler send_handler,ib_mad_recv_handler recv_handler,void * context,u32 registration_flags)198 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
199 u8 port_num,
200 enum ib_qp_type qp_type,
201 struct ib_mad_reg_req *mad_reg_req,
202 u8 rmpp_version,
203 ib_mad_send_handler send_handler,
204 ib_mad_recv_handler recv_handler,
205 void *context,
206 u32 registration_flags)
207 {
208 struct ib_mad_port_private *port_priv;
209 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
210 struct ib_mad_agent_private *mad_agent_priv;
211 struct ib_mad_reg_req *reg_req = NULL;
212 struct ib_mad_mgmt_class_table *class;
213 struct ib_mad_mgmt_vendor_class_table *vendor;
214 struct ib_mad_mgmt_vendor_class *vendor_class;
215 struct ib_mad_mgmt_method_table *method;
216 int ret2, qpn;
217 unsigned long flags;
218 u8 mgmt_class, vclass;
219
220 if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
221 (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
222 return ERR_PTR(-EPROTONOSUPPORT);
223
224 /* Validate parameters */
225 qpn = get_spl_qp_index(qp_type);
226 if (qpn == -1) {
227 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
228 __func__, qp_type);
229 goto error1;
230 }
231
232 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
233 dev_dbg_ratelimited(&device->dev,
234 "%s: invalid RMPP Version %u\n",
235 __func__, rmpp_version);
236 goto error1;
237 }
238
239 /* Validate MAD registration request if supplied */
240 if (mad_reg_req) {
241 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
242 dev_dbg_ratelimited(&device->dev,
243 "%s: invalid Class Version %u\n",
244 __func__,
245 mad_reg_req->mgmt_class_version);
246 goto error1;
247 }
248 if (!recv_handler) {
249 dev_dbg_ratelimited(&device->dev,
250 "%s: no recv_handler\n", __func__);
251 goto error1;
252 }
253 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
254 /*
255 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
256 * one in this range currently allowed
257 */
258 if (mad_reg_req->mgmt_class !=
259 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
260 dev_dbg_ratelimited(&device->dev,
261 "%s: Invalid Mgmt Class 0x%x\n",
262 __func__, mad_reg_req->mgmt_class);
263 goto error1;
264 }
265 } else if (mad_reg_req->mgmt_class == 0) {
266 /*
267 * Class 0 is reserved in IBA and is used for
268 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
269 */
270 dev_dbg_ratelimited(&device->dev,
271 "%s: Invalid Mgmt Class 0\n",
272 __func__);
273 goto error1;
274 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
275 /*
276 * If class is in "new" vendor range,
277 * ensure supplied OUI is not zero
278 */
279 if (!is_vendor_oui(mad_reg_req->oui)) {
280 dev_dbg_ratelimited(&device->dev,
281 "%s: No OUI specified for class 0x%x\n",
282 __func__,
283 mad_reg_req->mgmt_class);
284 goto error1;
285 }
286 }
287 /* Make sure class supplied is consistent with RMPP */
288 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
289 if (rmpp_version) {
290 dev_dbg_ratelimited(&device->dev,
291 "%s: RMPP version for non-RMPP class 0x%x\n",
292 __func__, mad_reg_req->mgmt_class);
293 goto error1;
294 }
295 }
296
297 /* Make sure class supplied is consistent with QP type */
298 if (qp_type == IB_QPT_SMI) {
299 if ((mad_reg_req->mgmt_class !=
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
301 (mad_reg_req->mgmt_class !=
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_dbg_ratelimited(&device->dev,
304 "%s: Invalid SM QP type: class 0x%x\n",
305 __func__, mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 } else {
309 if ((mad_reg_req->mgmt_class ==
310 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
311 (mad_reg_req->mgmt_class ==
312 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
313 dev_dbg_ratelimited(&device->dev,
314 "%s: Invalid GS QP type: class 0x%x\n",
315 __func__, mad_reg_req->mgmt_class);
316 goto error1;
317 }
318 }
319 } else {
320 /* No registration request supplied */
321 if (!send_handler)
322 goto error1;
323 if (registration_flags & IB_MAD_USER_RMPP)
324 goto error1;
325 }
326
327 /* Validate device and port */
328 port_priv = ib_get_mad_port(device, port_num);
329 if (!port_priv) {
330 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %d\n",
331 __func__, port_num);
332 ret = ERR_PTR(-ENODEV);
333 goto error1;
334 }
335
336 /* Verify the QP requested is supported. For example, Ethernet devices
337 * will not have QP0.
338 */
339 if (!port_priv->qp_info[qpn].qp) {
340 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
341 __func__, qpn);
342 ret = ERR_PTR(-EPROTONOSUPPORT);
343 goto error1;
344 }
345
346 /* Allocate structures */
347 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
348 if (!mad_agent_priv) {
349 ret = ERR_PTR(-ENOMEM);
350 goto error1;
351 }
352
353 if (mad_reg_req) {
354 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
355 if (!reg_req) {
356 ret = ERR_PTR(-ENOMEM);
357 goto error3;
358 }
359 }
360
361 /* Now, fill in the various structures */
362 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
363 mad_agent_priv->reg_req = reg_req;
364 mad_agent_priv->agent.rmpp_version = rmpp_version;
365 mad_agent_priv->agent.device = device;
366 mad_agent_priv->agent.recv_handler = recv_handler;
367 mad_agent_priv->agent.send_handler = send_handler;
368 mad_agent_priv->agent.context = context;
369 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
370 mad_agent_priv->agent.port_num = port_num;
371 mad_agent_priv->agent.flags = registration_flags;
372 spin_lock_init(&mad_agent_priv->lock);
373 INIT_LIST_HEAD(&mad_agent_priv->send_list);
374 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
375 INIT_LIST_HEAD(&mad_agent_priv->done_list);
376 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
377 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
378 INIT_LIST_HEAD(&mad_agent_priv->local_list);
379 INIT_WORK(&mad_agent_priv->local_work, local_completions);
380 atomic_set(&mad_agent_priv->refcount, 1);
381 init_completion(&mad_agent_priv->comp);
382
383 spin_lock_irqsave(&port_priv->reg_lock, flags);
384 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
385
386 /*
387 * Make sure MAD registration (if supplied)
388 * is non overlapping with any existing ones
389 */
390 if (mad_reg_req) {
391 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
392 if (!is_vendor_class(mgmt_class)) {
393 class = port_priv->version[mad_reg_req->
394 mgmt_class_version].class;
395 if (class) {
396 method = class->method_table[mgmt_class];
397 if (method) {
398 if (method_in_use(&method,
399 mad_reg_req))
400 goto error4;
401 }
402 }
403 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
404 mgmt_class);
405 } else {
406 /* "New" vendor class range */
407 vendor = port_priv->version[mad_reg_req->
408 mgmt_class_version].vendor;
409 if (vendor) {
410 vclass = vendor_class_index(mgmt_class);
411 vendor_class = vendor->vendor_class[vclass];
412 if (vendor_class) {
413 if (is_vendor_method_in_use(
414 vendor_class,
415 mad_reg_req))
416 goto error4;
417 }
418 }
419 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
420 }
421 if (ret2) {
422 ret = ERR_PTR(ret2);
423 goto error4;
424 }
425 }
426
427 /* Add mad agent into port's agent list */
428 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
429 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
430
431 return &mad_agent_priv->agent;
432
433 error4:
434 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
435 kfree(reg_req);
436 error3:
437 kfree(mad_agent_priv);
438 error1:
439 return ret;
440 }
441 EXPORT_SYMBOL(ib_register_mad_agent);
442
is_snooping_sends(int mad_snoop_flags)443 static inline int is_snooping_sends(int mad_snoop_flags)
444 {
445 return (mad_snoop_flags &
446 (/*IB_MAD_SNOOP_POSTED_SENDS |
447 IB_MAD_SNOOP_RMPP_SENDS |*/
448 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
449 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
450 }
451
is_snooping_recvs(int mad_snoop_flags)452 static inline int is_snooping_recvs(int mad_snoop_flags)
453 {
454 return (mad_snoop_flags &
455 (IB_MAD_SNOOP_RECVS /*|
456 IB_MAD_SNOOP_RMPP_RECVS*/));
457 }
458
register_snoop_agent(struct ib_mad_qp_info * qp_info,struct ib_mad_snoop_private * mad_snoop_priv)459 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
460 struct ib_mad_snoop_private *mad_snoop_priv)
461 {
462 struct ib_mad_snoop_private **new_snoop_table;
463 unsigned long flags;
464 int i;
465
466 spin_lock_irqsave(&qp_info->snoop_lock, flags);
467 /* Check for empty slot in array. */
468 for (i = 0; i < qp_info->snoop_table_size; i++)
469 if (!qp_info->snoop_table[i])
470 break;
471
472 if (i == qp_info->snoop_table_size) {
473 /* Grow table. */
474 new_snoop_table = krealloc(qp_info->snoop_table,
475 sizeof mad_snoop_priv *
476 (qp_info->snoop_table_size + 1),
477 GFP_ATOMIC);
478 if (!new_snoop_table) {
479 i = -ENOMEM;
480 goto out;
481 }
482
483 qp_info->snoop_table = new_snoop_table;
484 qp_info->snoop_table_size++;
485 }
486 qp_info->snoop_table[i] = mad_snoop_priv;
487 atomic_inc(&qp_info->snoop_count);
488 out:
489 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
490 return i;
491 }
492
ib_register_mad_snoop(struct ib_device * device,u8 port_num,enum ib_qp_type qp_type,int mad_snoop_flags,ib_mad_snoop_handler snoop_handler,ib_mad_recv_handler recv_handler,void * context)493 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
494 u8 port_num,
495 enum ib_qp_type qp_type,
496 int mad_snoop_flags,
497 ib_mad_snoop_handler snoop_handler,
498 ib_mad_recv_handler recv_handler,
499 void *context)
500 {
501 struct ib_mad_port_private *port_priv;
502 struct ib_mad_agent *ret;
503 struct ib_mad_snoop_private *mad_snoop_priv;
504 int qpn;
505
506 /* Validate parameters */
507 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
508 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
509 ret = ERR_PTR(-EINVAL);
510 goto error1;
511 }
512 qpn = get_spl_qp_index(qp_type);
513 if (qpn == -1) {
514 ret = ERR_PTR(-EINVAL);
515 goto error1;
516 }
517 port_priv = ib_get_mad_port(device, port_num);
518 if (!port_priv) {
519 ret = ERR_PTR(-ENODEV);
520 goto error1;
521 }
522 /* Allocate structures */
523 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
524 if (!mad_snoop_priv) {
525 ret = ERR_PTR(-ENOMEM);
526 goto error1;
527 }
528
529 /* Now, fill in the various structures */
530 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
531 mad_snoop_priv->agent.device = device;
532 mad_snoop_priv->agent.recv_handler = recv_handler;
533 mad_snoop_priv->agent.snoop_handler = snoop_handler;
534 mad_snoop_priv->agent.context = context;
535 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
536 mad_snoop_priv->agent.port_num = port_num;
537 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
538 init_completion(&mad_snoop_priv->comp);
539 mad_snoop_priv->snoop_index = register_snoop_agent(
540 &port_priv->qp_info[qpn],
541 mad_snoop_priv);
542 if (mad_snoop_priv->snoop_index < 0) {
543 ret = ERR_PTR(mad_snoop_priv->snoop_index);
544 goto error2;
545 }
546
547 atomic_set(&mad_snoop_priv->refcount, 1);
548 return &mad_snoop_priv->agent;
549
550 error2:
551 kfree(mad_snoop_priv);
552 error1:
553 return ret;
554 }
555 EXPORT_SYMBOL(ib_register_mad_snoop);
556
deref_mad_agent(struct ib_mad_agent_private * mad_agent_priv)557 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
558 {
559 if (atomic_dec_and_test(&mad_agent_priv->refcount))
560 complete(&mad_agent_priv->comp);
561 }
562
deref_snoop_agent(struct ib_mad_snoop_private * mad_snoop_priv)563 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
564 {
565 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
566 complete(&mad_snoop_priv->comp);
567 }
568
unregister_mad_agent(struct ib_mad_agent_private * mad_agent_priv)569 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
570 {
571 struct ib_mad_port_private *port_priv;
572 unsigned long flags;
573
574 /* Note that we could still be handling received MADs */
575
576 /*
577 * Canceling all sends results in dropping received response
578 * MADs, preventing us from queuing additional work
579 */
580 cancel_mads(mad_agent_priv);
581 port_priv = mad_agent_priv->qp_info->port_priv;
582 cancel_delayed_work_sync(&mad_agent_priv->timed_work);
583
584 spin_lock_irqsave(&port_priv->reg_lock, flags);
585 remove_mad_reg_req(mad_agent_priv);
586 list_del(&mad_agent_priv->agent_list);
587 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
588
589 flush_workqueue(port_priv->wq);
590 ib_cancel_rmpp_recvs(mad_agent_priv);
591
592 deref_mad_agent(mad_agent_priv);
593 wait_for_completion(&mad_agent_priv->comp);
594
595 kfree(mad_agent_priv->reg_req);
596 kfree(mad_agent_priv);
597 }
598
unregister_mad_snoop(struct ib_mad_snoop_private * mad_snoop_priv)599 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
600 {
601 struct ib_mad_qp_info *qp_info;
602 unsigned long flags;
603
604 qp_info = mad_snoop_priv->qp_info;
605 spin_lock_irqsave(&qp_info->snoop_lock, flags);
606 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
607 atomic_dec(&qp_info->snoop_count);
608 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
609
610 deref_snoop_agent(mad_snoop_priv);
611 wait_for_completion(&mad_snoop_priv->comp);
612
613 kfree(mad_snoop_priv);
614 }
615
616 /*
617 * ib_unregister_mad_agent - Unregisters a client from using MAD services
618 */
ib_unregister_mad_agent(struct ib_mad_agent * mad_agent)619 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
620 {
621 struct ib_mad_agent_private *mad_agent_priv;
622 struct ib_mad_snoop_private *mad_snoop_priv;
623
624 /* If the TID is zero, the agent can only snoop. */
625 if (mad_agent->hi_tid) {
626 mad_agent_priv = container_of(mad_agent,
627 struct ib_mad_agent_private,
628 agent);
629 unregister_mad_agent(mad_agent_priv);
630 } else {
631 mad_snoop_priv = container_of(mad_agent,
632 struct ib_mad_snoop_private,
633 agent);
634 unregister_mad_snoop(mad_snoop_priv);
635 }
636 return 0;
637 }
638 EXPORT_SYMBOL(ib_unregister_mad_agent);
639
dequeue_mad(struct ib_mad_list_head * mad_list)640 static void dequeue_mad(struct ib_mad_list_head *mad_list)
641 {
642 struct ib_mad_queue *mad_queue;
643 unsigned long flags;
644
645 BUG_ON(!mad_list->mad_queue);
646 mad_queue = mad_list->mad_queue;
647 spin_lock_irqsave(&mad_queue->lock, flags);
648 list_del(&mad_list->list);
649 mad_queue->count--;
650 spin_unlock_irqrestore(&mad_queue->lock, flags);
651 }
652
snoop_send(struct ib_mad_qp_info * qp_info,struct ib_mad_send_buf * send_buf,struct ib_mad_send_wc * mad_send_wc,int mad_snoop_flags)653 static void snoop_send(struct ib_mad_qp_info *qp_info,
654 struct ib_mad_send_buf *send_buf,
655 struct ib_mad_send_wc *mad_send_wc,
656 int mad_snoop_flags)
657 {
658 struct ib_mad_snoop_private *mad_snoop_priv;
659 unsigned long flags;
660 int i;
661
662 spin_lock_irqsave(&qp_info->snoop_lock, flags);
663 for (i = 0; i < qp_info->snoop_table_size; i++) {
664 mad_snoop_priv = qp_info->snoop_table[i];
665 if (!mad_snoop_priv ||
666 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
667 continue;
668
669 atomic_inc(&mad_snoop_priv->refcount);
670 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
671 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
672 send_buf, mad_send_wc);
673 deref_snoop_agent(mad_snoop_priv);
674 spin_lock_irqsave(&qp_info->snoop_lock, flags);
675 }
676 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
677 }
678
snoop_recv(struct ib_mad_qp_info * qp_info,struct ib_mad_recv_wc * mad_recv_wc,int mad_snoop_flags)679 static void snoop_recv(struct ib_mad_qp_info *qp_info,
680 struct ib_mad_recv_wc *mad_recv_wc,
681 int mad_snoop_flags)
682 {
683 struct ib_mad_snoop_private *mad_snoop_priv;
684 unsigned long flags;
685 int i;
686
687 spin_lock_irqsave(&qp_info->snoop_lock, flags);
688 for (i = 0; i < qp_info->snoop_table_size; i++) {
689 mad_snoop_priv = qp_info->snoop_table[i];
690 if (!mad_snoop_priv ||
691 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
692 continue;
693
694 atomic_inc(&mad_snoop_priv->refcount);
695 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
696 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
697 mad_recv_wc);
698 deref_snoop_agent(mad_snoop_priv);
699 spin_lock_irqsave(&qp_info->snoop_lock, flags);
700 }
701 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
702 }
703
build_smp_wc(struct ib_qp * qp,struct ib_cqe * cqe,u16 slid,u16 pkey_index,u8 port_num,struct ib_wc * wc)704 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
705 u16 pkey_index, u8 port_num, struct ib_wc *wc)
706 {
707 memset(wc, 0, sizeof *wc);
708 wc->wr_cqe = cqe;
709 wc->status = IB_WC_SUCCESS;
710 wc->opcode = IB_WC_RECV;
711 wc->pkey_index = pkey_index;
712 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
713 wc->src_qp = IB_QP0;
714 wc->qp = qp;
715 wc->slid = slid;
716 wc->sl = 0;
717 wc->dlid_path_bits = 0;
718 wc->port_num = port_num;
719 }
720
mad_priv_size(const struct ib_mad_private * mp)721 static size_t mad_priv_size(const struct ib_mad_private *mp)
722 {
723 return sizeof(struct ib_mad_private) + mp->mad_size;
724 }
725
alloc_mad_private(size_t mad_size,gfp_t flags)726 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
727 {
728 size_t size = sizeof(struct ib_mad_private) + mad_size;
729 struct ib_mad_private *ret = kzalloc(size, flags);
730
731 if (ret)
732 ret->mad_size = mad_size;
733
734 return ret;
735 }
736
port_mad_size(const struct ib_mad_port_private * port_priv)737 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
738 {
739 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
740 }
741
mad_priv_dma_size(const struct ib_mad_private * mp)742 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
743 {
744 return sizeof(struct ib_grh) + mp->mad_size;
745 }
746
747 /*
748 * Return 0 if SMP is to be sent
749 * Return 1 if SMP was consumed locally (whether or not solicited)
750 * Return < 0 if error
751 */
handle_outgoing_dr_smp(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_wr_private * mad_send_wr)752 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
753 struct ib_mad_send_wr_private *mad_send_wr)
754 {
755 int ret = 0;
756 struct ib_smp *smp = mad_send_wr->send_buf.mad;
757 struct opa_smp *opa_smp = (struct opa_smp *)smp;
758 unsigned long flags;
759 struct ib_mad_local_private *local;
760 struct ib_mad_private *mad_priv;
761 struct ib_mad_port_private *port_priv;
762 struct ib_mad_agent_private *recv_mad_agent = NULL;
763 struct ib_device *device = mad_agent_priv->agent.device;
764 u8 port_num;
765 struct ib_wc mad_wc;
766 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
767 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
768 u16 out_mad_pkey_index = 0;
769 u16 drslid;
770 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
771 mad_agent_priv->qp_info->port_priv->port_num);
772
773 if (rdma_cap_ib_switch(device) &&
774 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
775 port_num = send_wr->port_num;
776 else
777 port_num = mad_agent_priv->agent.port_num;
778
779 /*
780 * Directed route handling starts if the initial LID routed part of
781 * a request or the ending LID routed part of a response is empty.
782 * If we are at the start of the LID routed part, don't update the
783 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
784 */
785 if (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
786 u32 opa_drslid;
787
788 if ((opa_get_smp_direction(opa_smp)
789 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
790 OPA_LID_PERMISSIVE &&
791 opa_smi_handle_dr_smp_send(opa_smp,
792 rdma_cap_ib_switch(device),
793 port_num) == IB_SMI_DISCARD) {
794 ret = -EINVAL;
795 dev_err(&device->dev, "OPA Invalid directed route\n");
796 goto out;
797 }
798 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
799 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
800 opa_drslid & 0xffff0000) {
801 ret = -EINVAL;
802 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
803 opa_drslid);
804 goto out;
805 }
806 drslid = (u16)(opa_drslid & 0x0000ffff);
807
808 /* Check to post send on QP or process locally */
809 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
810 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
811 goto out;
812 } else {
813 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
814 IB_LID_PERMISSIVE &&
815 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
816 IB_SMI_DISCARD) {
817 ret = -EINVAL;
818 dev_err(&device->dev, "Invalid directed route\n");
819 goto out;
820 }
821 drslid = be16_to_cpu(smp->dr_slid);
822
823 /* Check to post send on QP or process locally */
824 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
825 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
826 goto out;
827 }
828
829 local = kmalloc(sizeof *local, GFP_ATOMIC);
830 if (!local) {
831 ret = -ENOMEM;
832 goto out;
833 }
834 local->mad_priv = NULL;
835 local->recv_mad_agent = NULL;
836 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
837 if (!mad_priv) {
838 ret = -ENOMEM;
839 kfree(local);
840 goto out;
841 }
842
843 build_smp_wc(mad_agent_priv->agent.qp,
844 send_wr->wr.wr_cqe, drslid,
845 send_wr->pkey_index,
846 send_wr->port_num, &mad_wc);
847
848 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
849 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
850 + mad_send_wr->send_buf.data_len
851 + sizeof(struct ib_grh);
852 }
853
854 /* No GRH for DR SMP */
855 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
856 (const struct ib_mad_hdr *)smp, mad_size,
857 (struct ib_mad_hdr *)mad_priv->mad,
858 &mad_size, &out_mad_pkey_index);
859 switch (ret)
860 {
861 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
862 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
863 mad_agent_priv->agent.recv_handler) {
864 local->mad_priv = mad_priv;
865 local->recv_mad_agent = mad_agent_priv;
866 /*
867 * Reference MAD agent until receive
868 * side of local completion handled
869 */
870 atomic_inc(&mad_agent_priv->refcount);
871 } else
872 kfree(mad_priv);
873 break;
874 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
875 kfree(mad_priv);
876 break;
877 case IB_MAD_RESULT_SUCCESS:
878 /* Treat like an incoming receive MAD */
879 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
880 mad_agent_priv->agent.port_num);
881 if (port_priv) {
882 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
883 recv_mad_agent = find_mad_agent(port_priv,
884 (const struct ib_mad_hdr *)mad_priv->mad);
885 }
886 if (!port_priv || !recv_mad_agent) {
887 /*
888 * No receiving agent so drop packet and
889 * generate send completion.
890 */
891 kfree(mad_priv);
892 break;
893 }
894 local->mad_priv = mad_priv;
895 local->recv_mad_agent = recv_mad_agent;
896 break;
897 default:
898 kfree(mad_priv);
899 kfree(local);
900 ret = -EINVAL;
901 goto out;
902 }
903
904 local->mad_send_wr = mad_send_wr;
905 if (opa) {
906 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
907 local->return_wc_byte_len = mad_size;
908 }
909 /* Reference MAD agent until send side of local completion handled */
910 atomic_inc(&mad_agent_priv->refcount);
911 /* Queue local completion to local list */
912 spin_lock_irqsave(&mad_agent_priv->lock, flags);
913 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
914 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
915 queue_work(mad_agent_priv->qp_info->port_priv->wq,
916 &mad_agent_priv->local_work);
917 ret = 1;
918 out:
919 return ret;
920 }
921
get_pad_size(int hdr_len,int data_len,size_t mad_size)922 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
923 {
924 int seg_size, pad;
925
926 seg_size = mad_size - hdr_len;
927 if (data_len && seg_size) {
928 pad = seg_size - data_len % seg_size;
929 return pad == seg_size ? 0 : pad;
930 } else
931 return seg_size;
932 }
933
free_send_rmpp_list(struct ib_mad_send_wr_private * mad_send_wr)934 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
935 {
936 struct ib_rmpp_segment *s, *t;
937
938 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
939 list_del(&s->list);
940 kfree(s);
941 }
942 }
943
alloc_send_rmpp_list(struct ib_mad_send_wr_private * send_wr,size_t mad_size,gfp_t gfp_mask)944 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
945 size_t mad_size, gfp_t gfp_mask)
946 {
947 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
948 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
949 struct ib_rmpp_segment *seg = NULL;
950 int left, seg_size, pad;
951
952 send_buf->seg_size = mad_size - send_buf->hdr_len;
953 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
954 seg_size = send_buf->seg_size;
955 pad = send_wr->pad;
956
957 /* Allocate data segments. */
958 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
959 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
960 if (!seg) {
961 free_send_rmpp_list(send_wr);
962 return -ENOMEM;
963 }
964 seg->num = ++send_buf->seg_count;
965 list_add_tail(&seg->list, &send_wr->rmpp_list);
966 }
967
968 /* Zero any padding */
969 if (pad)
970 memset(seg->data + seg_size - pad, 0, pad);
971
972 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
973 agent.rmpp_version;
974 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
975 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
976
977 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
978 struct ib_rmpp_segment, list);
979 send_wr->last_ack_seg = send_wr->cur_seg;
980 return 0;
981 }
982
ib_mad_kernel_rmpp_agent(const struct ib_mad_agent * agent)983 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
984 {
985 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
986 }
987 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
988
ib_create_send_mad(struct ib_mad_agent * mad_agent,u32 remote_qpn,u16 pkey_index,int rmpp_active,int hdr_len,int data_len,gfp_t gfp_mask,u8 base_version)989 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
990 u32 remote_qpn, u16 pkey_index,
991 int rmpp_active,
992 int hdr_len, int data_len,
993 gfp_t gfp_mask,
994 u8 base_version)
995 {
996 struct ib_mad_agent_private *mad_agent_priv;
997 struct ib_mad_send_wr_private *mad_send_wr;
998 int pad, message_size, ret, size;
999 void *buf;
1000 size_t mad_size;
1001 bool opa;
1002
1003 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1004 agent);
1005
1006 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1007
1008 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1009 mad_size = sizeof(struct opa_mad);
1010 else
1011 mad_size = sizeof(struct ib_mad);
1012
1013 pad = get_pad_size(hdr_len, data_len, mad_size);
1014 message_size = hdr_len + data_len + pad;
1015
1016 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1017 if (!rmpp_active && message_size > mad_size)
1018 return ERR_PTR(-EINVAL);
1019 } else
1020 if (rmpp_active || message_size > mad_size)
1021 return ERR_PTR(-EINVAL);
1022
1023 size = rmpp_active ? hdr_len : mad_size;
1024 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1025 if (!buf)
1026 return ERR_PTR(-ENOMEM);
1027
1028 mad_send_wr = (struct ib_mad_send_wr_private *)((char *)buf + size);
1029 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1030 mad_send_wr->send_buf.mad = buf;
1031 mad_send_wr->send_buf.hdr_len = hdr_len;
1032 mad_send_wr->send_buf.data_len = data_len;
1033 mad_send_wr->pad = pad;
1034
1035 mad_send_wr->mad_agent_priv = mad_agent_priv;
1036 mad_send_wr->sg_list[0].length = hdr_len;
1037 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1038
1039 /* OPA MADs don't have to be the full 2048 bytes */
1040 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1041 data_len < mad_size - hdr_len)
1042 mad_send_wr->sg_list[1].length = data_len;
1043 else
1044 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1045
1046 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1047
1048 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1049
1050 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1051 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1052 mad_send_wr->send_wr.wr.num_sge = 2;
1053 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1054 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1055 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1056 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1057 mad_send_wr->send_wr.pkey_index = pkey_index;
1058
1059 if (rmpp_active) {
1060 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1061 if (ret) {
1062 kfree(buf);
1063 return ERR_PTR(ret);
1064 }
1065 }
1066
1067 mad_send_wr->send_buf.mad_agent = mad_agent;
1068 atomic_inc(&mad_agent_priv->refcount);
1069 return &mad_send_wr->send_buf;
1070 }
1071 EXPORT_SYMBOL(ib_create_send_mad);
1072
ib_get_mad_data_offset(u8 mgmt_class)1073 int ib_get_mad_data_offset(u8 mgmt_class)
1074 {
1075 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1076 return IB_MGMT_SA_HDR;
1077 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1078 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1079 (mgmt_class == IB_MGMT_CLASS_BIS))
1080 return IB_MGMT_DEVICE_HDR;
1081 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1082 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1083 return IB_MGMT_VENDOR_HDR;
1084 else
1085 return IB_MGMT_MAD_HDR;
1086 }
1087 EXPORT_SYMBOL(ib_get_mad_data_offset);
1088
ib_is_mad_class_rmpp(u8 mgmt_class)1089 int ib_is_mad_class_rmpp(u8 mgmt_class)
1090 {
1091 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1092 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1093 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1094 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1095 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1096 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1097 return 1;
1098 return 0;
1099 }
1100 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1101
ib_get_rmpp_segment(struct ib_mad_send_buf * send_buf,int seg_num)1102 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1103 {
1104 struct ib_mad_send_wr_private *mad_send_wr;
1105 struct list_head *list;
1106
1107 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1108 send_buf);
1109 list = &mad_send_wr->cur_seg->list;
1110
1111 if (mad_send_wr->cur_seg->num < seg_num) {
1112 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1113 if (mad_send_wr->cur_seg->num == seg_num)
1114 break;
1115 } else if (mad_send_wr->cur_seg->num > seg_num) {
1116 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1117 if (mad_send_wr->cur_seg->num == seg_num)
1118 break;
1119 }
1120 return mad_send_wr->cur_seg->data;
1121 }
1122 EXPORT_SYMBOL(ib_get_rmpp_segment);
1123
ib_get_payload(struct ib_mad_send_wr_private * mad_send_wr)1124 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1125 {
1126 if (mad_send_wr->send_buf.seg_count)
1127 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1128 mad_send_wr->seg_num);
1129 else
1130 return (char *)mad_send_wr->send_buf.mad +
1131 mad_send_wr->send_buf.hdr_len;
1132 }
1133
ib_free_send_mad(struct ib_mad_send_buf * send_buf)1134 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1135 {
1136 struct ib_mad_agent_private *mad_agent_priv;
1137 struct ib_mad_send_wr_private *mad_send_wr;
1138
1139 mad_agent_priv = container_of(send_buf->mad_agent,
1140 struct ib_mad_agent_private, agent);
1141 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1142 send_buf);
1143
1144 free_send_rmpp_list(mad_send_wr);
1145 kfree(send_buf->mad);
1146 deref_mad_agent(mad_agent_priv);
1147 }
1148 EXPORT_SYMBOL(ib_free_send_mad);
1149
ib_send_mad(struct ib_mad_send_wr_private * mad_send_wr)1150 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1151 {
1152 struct ib_mad_qp_info *qp_info;
1153 struct list_head *list;
1154 struct ib_mad_agent *mad_agent;
1155 struct ib_sge *sge;
1156 unsigned long flags;
1157 int ret;
1158
1159 /* Set WR ID to find mad_send_wr upon completion */
1160 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1161 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1162 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1163 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1164
1165 mad_agent = mad_send_wr->send_buf.mad_agent;
1166 sge = mad_send_wr->sg_list;
1167 sge[0].addr = ib_dma_map_single(mad_agent->device,
1168 mad_send_wr->send_buf.mad,
1169 sge[0].length,
1170 DMA_TO_DEVICE);
1171 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1172 return -ENOMEM;
1173
1174 mad_send_wr->header_mapping = sge[0].addr;
1175
1176 sge[1].addr = ib_dma_map_single(mad_agent->device,
1177 ib_get_payload(mad_send_wr),
1178 sge[1].length,
1179 DMA_TO_DEVICE);
1180 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1181 ib_dma_unmap_single(mad_agent->device,
1182 mad_send_wr->header_mapping,
1183 sge[0].length, DMA_TO_DEVICE);
1184 return -ENOMEM;
1185 }
1186 mad_send_wr->payload_mapping = sge[1].addr;
1187
1188 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1189 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1190 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1191 NULL);
1192 list = &qp_info->send_queue.list;
1193 } else {
1194 ret = 0;
1195 list = &qp_info->overflow_list;
1196 }
1197
1198 if (!ret) {
1199 qp_info->send_queue.count++;
1200 list_add_tail(&mad_send_wr->mad_list.list, list);
1201 }
1202 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1203 if (ret) {
1204 ib_dma_unmap_single(mad_agent->device,
1205 mad_send_wr->header_mapping,
1206 sge[0].length, DMA_TO_DEVICE);
1207 ib_dma_unmap_single(mad_agent->device,
1208 mad_send_wr->payload_mapping,
1209 sge[1].length, DMA_TO_DEVICE);
1210 }
1211 return ret;
1212 }
1213
1214 /*
1215 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1216 * with the registered client
1217 */
ib_post_send_mad(struct ib_mad_send_buf * send_buf,struct ib_mad_send_buf ** bad_send_buf)1218 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1219 struct ib_mad_send_buf **bad_send_buf)
1220 {
1221 struct ib_mad_agent_private *mad_agent_priv;
1222 struct ib_mad_send_buf *next_send_buf;
1223 struct ib_mad_send_wr_private *mad_send_wr;
1224 unsigned long flags;
1225 int ret = -EINVAL;
1226
1227 /* Walk list of send WRs and post each on send list */
1228 for (; send_buf; send_buf = next_send_buf) {
1229
1230 mad_send_wr = container_of(send_buf,
1231 struct ib_mad_send_wr_private,
1232 send_buf);
1233 mad_agent_priv = mad_send_wr->mad_agent_priv;
1234
1235 if (!send_buf->mad_agent->send_handler ||
1236 (send_buf->timeout_ms &&
1237 !send_buf->mad_agent->recv_handler)) {
1238 ret = -EINVAL;
1239 goto error;
1240 }
1241
1242 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1243 if (mad_agent_priv->agent.rmpp_version) {
1244 ret = -EINVAL;
1245 goto error;
1246 }
1247 }
1248
1249 /*
1250 * Save pointer to next work request to post in case the
1251 * current one completes, and the user modifies the work
1252 * request associated with the completion
1253 */
1254 next_send_buf = send_buf->next;
1255 mad_send_wr->send_wr.ah = send_buf->ah;
1256
1257 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1258 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1259 ret = handle_outgoing_dr_smp(mad_agent_priv,
1260 mad_send_wr);
1261 if (ret < 0) /* error */
1262 goto error;
1263 else if (ret == 1) /* locally consumed */
1264 continue;
1265 }
1266
1267 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1268 /* Timeout will be updated after send completes */
1269 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1270 mad_send_wr->max_retries = send_buf->retries;
1271 mad_send_wr->retries_left = send_buf->retries;
1272 send_buf->retries = 0;
1273 /* Reference for work request to QP + response */
1274 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1275 mad_send_wr->status = IB_WC_SUCCESS;
1276
1277 /* Reference MAD agent until send completes */
1278 atomic_inc(&mad_agent_priv->refcount);
1279 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1280 list_add_tail(&mad_send_wr->agent_list,
1281 &mad_agent_priv->send_list);
1282 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1283
1284 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1285 ret = ib_send_rmpp_mad(mad_send_wr);
1286 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1287 ret = ib_send_mad(mad_send_wr);
1288 } else
1289 ret = ib_send_mad(mad_send_wr);
1290 if (ret < 0) {
1291 /* Fail send request */
1292 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1293 list_del(&mad_send_wr->agent_list);
1294 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1295 atomic_dec(&mad_agent_priv->refcount);
1296 goto error;
1297 }
1298 }
1299 return 0;
1300 error:
1301 if (bad_send_buf)
1302 *bad_send_buf = send_buf;
1303 return ret;
1304 }
1305 EXPORT_SYMBOL(ib_post_send_mad);
1306
1307 /*
1308 * ib_free_recv_mad - Returns data buffers used to receive
1309 * a MAD to the access layer
1310 */
ib_free_recv_mad(struct ib_mad_recv_wc * mad_recv_wc)1311 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1312 {
1313 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1314 struct ib_mad_private_header *mad_priv_hdr;
1315 struct ib_mad_private *priv;
1316 struct list_head free_list;
1317
1318 INIT_LIST_HEAD(&free_list);
1319 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1320
1321 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1322 &free_list, list) {
1323 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1324 recv_buf);
1325 mad_priv_hdr = container_of(mad_recv_wc,
1326 struct ib_mad_private_header,
1327 recv_wc);
1328 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1329 header);
1330 kfree(priv);
1331 }
1332 }
1333 EXPORT_SYMBOL(ib_free_recv_mad);
1334
ib_redirect_mad_qp(struct ib_qp * qp,u8 rmpp_version,ib_mad_send_handler send_handler,ib_mad_recv_handler recv_handler,void * context)1335 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1336 u8 rmpp_version,
1337 ib_mad_send_handler send_handler,
1338 ib_mad_recv_handler recv_handler,
1339 void *context)
1340 {
1341 return ERR_PTR(-EINVAL); /* XXX: for now */
1342 }
1343 EXPORT_SYMBOL(ib_redirect_mad_qp);
1344
ib_process_mad_wc(struct ib_mad_agent * mad_agent,struct ib_wc * wc)1345 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1346 struct ib_wc *wc)
1347 {
1348 dev_err(&mad_agent->device->dev,
1349 "ib_process_mad_wc() not implemented yet\n");
1350 return 0;
1351 }
1352 EXPORT_SYMBOL(ib_process_mad_wc);
1353
method_in_use(struct ib_mad_mgmt_method_table ** method,struct ib_mad_reg_req * mad_reg_req)1354 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1355 struct ib_mad_reg_req *mad_reg_req)
1356 {
1357 int i;
1358
1359 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1360 if ((*method)->agent[i]) {
1361 pr_err("Method %d already in use\n", i);
1362 return -EINVAL;
1363 }
1364 }
1365 return 0;
1366 }
1367
allocate_method_table(struct ib_mad_mgmt_method_table ** method)1368 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1369 {
1370 /* Allocate management method table */
1371 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1372 return (*method) ? 0 : (-ENOMEM);
1373 }
1374
1375 /*
1376 * Check to see if there are any methods still in use
1377 */
check_method_table(struct ib_mad_mgmt_method_table * method)1378 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1379 {
1380 int i;
1381
1382 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1383 if (method->agent[i])
1384 return 1;
1385 return 0;
1386 }
1387
1388 /*
1389 * Check to see if there are any method tables for this class still in use
1390 */
check_class_table(struct ib_mad_mgmt_class_table * class)1391 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1392 {
1393 int i;
1394
1395 for (i = 0; i < MAX_MGMT_CLASS; i++)
1396 if (class->method_table[i])
1397 return 1;
1398 return 0;
1399 }
1400
check_vendor_class(struct ib_mad_mgmt_vendor_class * vendor_class)1401 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1402 {
1403 int i;
1404
1405 for (i = 0; i < MAX_MGMT_OUI; i++)
1406 if (vendor_class->method_table[i])
1407 return 1;
1408 return 0;
1409 }
1410
find_vendor_oui(struct ib_mad_mgmt_vendor_class * vendor_class,const char * oui)1411 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1412 const char *oui)
1413 {
1414 int i;
1415
1416 for (i = 0; i < MAX_MGMT_OUI; i++)
1417 /* Is there matching OUI for this vendor class ? */
1418 if (!memcmp(vendor_class->oui[i], oui, 3))
1419 return i;
1420
1421 return -1;
1422 }
1423
check_vendor_table(struct ib_mad_mgmt_vendor_class_table * vendor)1424 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1425 {
1426 int i;
1427
1428 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1429 if (vendor->vendor_class[i])
1430 return 1;
1431
1432 return 0;
1433 }
1434
remove_methods_mad_agent(struct ib_mad_mgmt_method_table * method,struct ib_mad_agent_private * agent)1435 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1436 struct ib_mad_agent_private *agent)
1437 {
1438 int i;
1439
1440 /* Remove any methods for this mad agent */
1441 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1442 if (method->agent[i] == agent) {
1443 method->agent[i] = NULL;
1444 }
1445 }
1446 }
1447
add_nonoui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv,u8 mgmt_class)1448 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1449 struct ib_mad_agent_private *agent_priv,
1450 u8 mgmt_class)
1451 {
1452 struct ib_mad_port_private *port_priv;
1453 struct ib_mad_mgmt_class_table **class;
1454 struct ib_mad_mgmt_method_table **method;
1455 int i, ret;
1456
1457 port_priv = agent_priv->qp_info->port_priv;
1458 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1459 if (!*class) {
1460 /* Allocate management class table for "new" class version */
1461 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1462 if (!*class) {
1463 ret = -ENOMEM;
1464 goto error1;
1465 }
1466
1467 /* Allocate method table for this management class */
1468 method = &(*class)->method_table[mgmt_class];
1469 if ((ret = allocate_method_table(method)))
1470 goto error2;
1471 } else {
1472 method = &(*class)->method_table[mgmt_class];
1473 if (!*method) {
1474 /* Allocate method table for this management class */
1475 if ((ret = allocate_method_table(method)))
1476 goto error1;
1477 }
1478 }
1479
1480 /* Now, make sure methods are not already in use */
1481 if (method_in_use(method, mad_reg_req))
1482 goto error3;
1483
1484 /* Finally, add in methods being registered */
1485 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1486 (*method)->agent[i] = agent_priv;
1487
1488 return 0;
1489
1490 error3:
1491 /* Remove any methods for this mad agent */
1492 remove_methods_mad_agent(*method, agent_priv);
1493 /* Now, check to see if there are any methods in use */
1494 if (!check_method_table(*method)) {
1495 /* If not, release management method table */
1496 kfree(*method);
1497 *method = NULL;
1498 }
1499 ret = -EINVAL;
1500 goto error1;
1501 error2:
1502 kfree(*class);
1503 *class = NULL;
1504 error1:
1505 return ret;
1506 }
1507
add_oui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv)1508 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1509 struct ib_mad_agent_private *agent_priv)
1510 {
1511 struct ib_mad_port_private *port_priv;
1512 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1513 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1514 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1515 struct ib_mad_mgmt_method_table **method;
1516 int i, ret = -ENOMEM;
1517 u8 vclass;
1518
1519 /* "New" vendor (with OUI) class */
1520 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1521 port_priv = agent_priv->qp_info->port_priv;
1522 vendor_table = &port_priv->version[
1523 mad_reg_req->mgmt_class_version].vendor;
1524 if (!*vendor_table) {
1525 /* Allocate mgmt vendor class table for "new" class version */
1526 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1527 if (!vendor)
1528 goto error1;
1529
1530 *vendor_table = vendor;
1531 }
1532 if (!(*vendor_table)->vendor_class[vclass]) {
1533 /* Allocate table for this management vendor class */
1534 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1535 if (!vendor_class)
1536 goto error2;
1537
1538 (*vendor_table)->vendor_class[vclass] = vendor_class;
1539 }
1540 for (i = 0; i < MAX_MGMT_OUI; i++) {
1541 /* Is there matching OUI for this vendor class ? */
1542 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1543 mad_reg_req->oui, 3)) {
1544 method = &(*vendor_table)->vendor_class[
1545 vclass]->method_table[i];
1546 if (!*method)
1547 goto error3;
1548 goto check_in_use;
1549 }
1550 }
1551 for (i = 0; i < MAX_MGMT_OUI; i++) {
1552 /* OUI slot available ? */
1553 if (!is_vendor_oui((*vendor_table)->vendor_class[
1554 vclass]->oui[i])) {
1555 method = &(*vendor_table)->vendor_class[
1556 vclass]->method_table[i];
1557 /* Allocate method table for this OUI */
1558 if (!*method) {
1559 ret = allocate_method_table(method);
1560 if (ret)
1561 goto error3;
1562 }
1563 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1564 mad_reg_req->oui, 3);
1565 goto check_in_use;
1566 }
1567 }
1568 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1569 goto error3;
1570
1571 check_in_use:
1572 /* Now, make sure methods are not already in use */
1573 if (method_in_use(method, mad_reg_req))
1574 goto error4;
1575
1576 /* Finally, add in methods being registered */
1577 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1578 (*method)->agent[i] = agent_priv;
1579
1580 return 0;
1581
1582 error4:
1583 /* Remove any methods for this mad agent */
1584 remove_methods_mad_agent(*method, agent_priv);
1585 /* Now, check to see if there are any methods in use */
1586 if (!check_method_table(*method)) {
1587 /* If not, release management method table */
1588 kfree(*method);
1589 *method = NULL;
1590 }
1591 ret = -EINVAL;
1592 error3:
1593 if (vendor_class) {
1594 (*vendor_table)->vendor_class[vclass] = NULL;
1595 kfree(vendor_class);
1596 }
1597 error2:
1598 if (vendor) {
1599 *vendor_table = NULL;
1600 kfree(vendor);
1601 }
1602 error1:
1603 return ret;
1604 }
1605
remove_mad_reg_req(struct ib_mad_agent_private * agent_priv)1606 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1607 {
1608 struct ib_mad_port_private *port_priv;
1609 struct ib_mad_mgmt_class_table *class;
1610 struct ib_mad_mgmt_method_table *method;
1611 struct ib_mad_mgmt_vendor_class_table *vendor;
1612 struct ib_mad_mgmt_vendor_class *vendor_class;
1613 int index;
1614 u8 mgmt_class;
1615
1616 /*
1617 * Was MAD registration request supplied
1618 * with original registration ?
1619 */
1620 if (!agent_priv->reg_req) {
1621 goto out;
1622 }
1623
1624 port_priv = agent_priv->qp_info->port_priv;
1625 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1626 class = port_priv->version[
1627 agent_priv->reg_req->mgmt_class_version].class;
1628 if (!class)
1629 goto vendor_check;
1630
1631 method = class->method_table[mgmt_class];
1632 if (method) {
1633 /* Remove any methods for this mad agent */
1634 remove_methods_mad_agent(method, agent_priv);
1635 /* Now, check to see if there are any methods still in use */
1636 if (!check_method_table(method)) {
1637 /* If not, release management method table */
1638 kfree(method);
1639 class->method_table[mgmt_class] = NULL;
1640 /* Any management classes left ? */
1641 if (!check_class_table(class)) {
1642 /* If not, release management class table */
1643 kfree(class);
1644 port_priv->version[
1645 agent_priv->reg_req->
1646 mgmt_class_version].class = NULL;
1647 }
1648 }
1649 }
1650
1651 vendor_check:
1652 if (!is_vendor_class(mgmt_class))
1653 goto out;
1654
1655 /* normalize mgmt_class to vendor range 2 */
1656 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1657 vendor = port_priv->version[
1658 agent_priv->reg_req->mgmt_class_version].vendor;
1659
1660 if (!vendor)
1661 goto out;
1662
1663 vendor_class = vendor->vendor_class[mgmt_class];
1664 if (vendor_class) {
1665 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1666 if (index < 0)
1667 goto out;
1668 method = vendor_class->method_table[index];
1669 if (method) {
1670 /* Remove any methods for this mad agent */
1671 remove_methods_mad_agent(method, agent_priv);
1672 /*
1673 * Now, check to see if there are
1674 * any methods still in use
1675 */
1676 if (!check_method_table(method)) {
1677 /* If not, release management method table */
1678 kfree(method);
1679 vendor_class->method_table[index] = NULL;
1680 memset(vendor_class->oui[index], 0, 3);
1681 /* Any OUIs left ? */
1682 if (!check_vendor_class(vendor_class)) {
1683 /* If not, release vendor class table */
1684 kfree(vendor_class);
1685 vendor->vendor_class[mgmt_class] = NULL;
1686 /* Any other vendor classes left ? */
1687 if (!check_vendor_table(vendor)) {
1688 kfree(vendor);
1689 port_priv->version[
1690 agent_priv->reg_req->
1691 mgmt_class_version].
1692 vendor = NULL;
1693 }
1694 }
1695 }
1696 }
1697 }
1698
1699 out:
1700 return;
1701 }
1702
1703 static struct ib_mad_agent_private *
find_mad_agent(struct ib_mad_port_private * port_priv,const struct ib_mad_hdr * mad_hdr)1704 find_mad_agent(struct ib_mad_port_private *port_priv,
1705 const struct ib_mad_hdr *mad_hdr)
1706 {
1707 struct ib_mad_agent_private *mad_agent = NULL;
1708 unsigned long flags;
1709
1710 spin_lock_irqsave(&port_priv->reg_lock, flags);
1711 if (ib_response_mad(mad_hdr)) {
1712 u32 hi_tid;
1713 struct ib_mad_agent_private *entry;
1714
1715 /*
1716 * Routing is based on high 32 bits of transaction ID
1717 * of MAD.
1718 */
1719 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1720 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1721 if (entry->agent.hi_tid == hi_tid) {
1722 mad_agent = entry;
1723 break;
1724 }
1725 }
1726 } else {
1727 struct ib_mad_mgmt_class_table *class;
1728 struct ib_mad_mgmt_method_table *method;
1729 struct ib_mad_mgmt_vendor_class_table *vendor;
1730 struct ib_mad_mgmt_vendor_class *vendor_class;
1731 const struct ib_vendor_mad *vendor_mad;
1732 int index;
1733
1734 /*
1735 * Routing is based on version, class, and method
1736 * For "newer" vendor MADs, also based on OUI
1737 */
1738 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1739 goto out;
1740 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1741 class = port_priv->version[
1742 mad_hdr->class_version].class;
1743 if (!class)
1744 goto out;
1745 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1746 ARRAY_SIZE(class->method_table))
1747 goto out;
1748 method = class->method_table[convert_mgmt_class(
1749 mad_hdr->mgmt_class)];
1750 if (method)
1751 mad_agent = method->agent[mad_hdr->method &
1752 ~IB_MGMT_METHOD_RESP];
1753 } else {
1754 vendor = port_priv->version[
1755 mad_hdr->class_version].vendor;
1756 if (!vendor)
1757 goto out;
1758 vendor_class = vendor->vendor_class[vendor_class_index(
1759 mad_hdr->mgmt_class)];
1760 if (!vendor_class)
1761 goto out;
1762 /* Find matching OUI */
1763 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1764 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1765 if (index == -1)
1766 goto out;
1767 method = vendor_class->method_table[index];
1768 if (method) {
1769 mad_agent = method->agent[mad_hdr->method &
1770 ~IB_MGMT_METHOD_RESP];
1771 }
1772 }
1773 }
1774
1775 if (mad_agent) {
1776 if (mad_agent->agent.recv_handler)
1777 atomic_inc(&mad_agent->refcount);
1778 else {
1779 dev_notice(&port_priv->device->dev,
1780 "No receive handler for client %p on port %d\n",
1781 &mad_agent->agent, port_priv->port_num);
1782 mad_agent = NULL;
1783 }
1784 }
1785 out:
1786 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1787
1788 return mad_agent;
1789 }
1790
validate_mad(const struct ib_mad_hdr * mad_hdr,const struct ib_mad_qp_info * qp_info,bool opa)1791 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1792 const struct ib_mad_qp_info *qp_info,
1793 bool opa)
1794 {
1795 int valid = 0;
1796 u32 qp_num = qp_info->qp->qp_num;
1797
1798 /* Make sure MAD base version is understood */
1799 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1800 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1801 pr_err("MAD received with unsupported base version %d %s\n",
1802 mad_hdr->base_version, opa ? "(opa)" : "");
1803 goto out;
1804 }
1805
1806 /* Filter SMI packets sent to other than QP0 */
1807 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1808 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1809 if (qp_num == 0)
1810 valid = 1;
1811 } else {
1812 /* CM attributes other than ClassPortInfo only use Send method */
1813 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1814 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1815 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1816 goto out;
1817 /* Filter GSI packets sent to QP0 */
1818 if (qp_num != 0)
1819 valid = 1;
1820 }
1821
1822 out:
1823 return valid;
1824 }
1825
is_rmpp_data_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_hdr * mad_hdr)1826 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1827 const struct ib_mad_hdr *mad_hdr)
1828 {
1829 const struct ib_rmpp_mad *rmpp_mad;
1830
1831 rmpp_mad = (const struct ib_rmpp_mad *)mad_hdr;
1832 return !mad_agent_priv->agent.rmpp_version ||
1833 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1834 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1835 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1836 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1837 }
1838
rcv_has_same_class(const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1839 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1840 const struct ib_mad_recv_wc *rwc)
1841 {
1842 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1843 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1844 }
1845
rcv_has_same_gid(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1846 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1847 const struct ib_mad_send_wr_private *wr,
1848 const struct ib_mad_recv_wc *rwc )
1849 {
1850 struct rdma_ah_attr attr;
1851 u8 send_resp, rcv_resp;
1852 union ib_gid sgid;
1853 struct ib_device *device = mad_agent_priv->agent.device;
1854 u8 port_num = mad_agent_priv->agent.port_num;
1855 u8 lmc;
1856 bool has_grh;
1857
1858 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1859 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1860
1861 if (send_resp == rcv_resp)
1862 /* both requests, or both responses. GIDs different */
1863 return 0;
1864
1865 if (rdma_query_ah(wr->send_buf.ah, &attr))
1866 /* Assume not equal, to avoid false positives. */
1867 return 0;
1868
1869 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1870 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1871 /* one has GID, other does not. Assume different */
1872 return 0;
1873
1874 if (!send_resp && rcv_resp) {
1875 /* is request/response. */
1876 if (!has_grh) {
1877 if (ib_get_cached_lmc(device, port_num, &lmc))
1878 return 0;
1879 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1880 rwc->wc->dlid_path_bits) &
1881 ((1 << lmc) - 1)));
1882 } else {
1883 const struct ib_global_route *grh =
1884 rdma_ah_read_grh(&attr);
1885
1886 if (rdma_query_gid(device, port_num,
1887 grh->sgid_index, &sgid))
1888 return 0;
1889 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1890 16);
1891 }
1892 }
1893
1894 if (!has_grh)
1895 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1896 else
1897 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1898 rwc->recv_buf.grh->sgid.raw,
1899 16);
1900 }
1901
is_direct(u8 class)1902 static inline int is_direct(u8 class)
1903 {
1904 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1905 }
1906
1907 struct ib_mad_send_wr_private*
ib_find_send_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_recv_wc * wc)1908 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1909 const struct ib_mad_recv_wc *wc)
1910 {
1911 struct ib_mad_send_wr_private *wr;
1912 const struct ib_mad_hdr *mad_hdr;
1913
1914 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1915
1916 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1917 if ((wr->tid == mad_hdr->tid) &&
1918 rcv_has_same_class(wr, wc) &&
1919 /*
1920 * Don't check GID for direct routed MADs.
1921 * These might have permissive LIDs.
1922 */
1923 (is_direct(mad_hdr->mgmt_class) ||
1924 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1925 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1926 }
1927
1928 /*
1929 * It's possible to receive the response before we've
1930 * been notified that the send has completed
1931 */
1932 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1933 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1934 wr->tid == mad_hdr->tid &&
1935 wr->timeout &&
1936 rcv_has_same_class(wr, wc) &&
1937 /*
1938 * Don't check GID for direct routed MADs.
1939 * These might have permissive LIDs.
1940 */
1941 (is_direct(mad_hdr->mgmt_class) ||
1942 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1943 /* Verify request has not been canceled */
1944 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1945 }
1946 return NULL;
1947 }
1948
ib_mark_mad_done(struct ib_mad_send_wr_private * mad_send_wr)1949 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1950 {
1951 mad_send_wr->timeout = 0;
1952 if (mad_send_wr->refcount == 1)
1953 list_move_tail(&mad_send_wr->agent_list,
1954 &mad_send_wr->mad_agent_priv->done_list);
1955 }
1956
ib_mad_complete_recv(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_recv_wc * mad_recv_wc)1957 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1958 struct ib_mad_recv_wc *mad_recv_wc)
1959 {
1960 struct ib_mad_send_wr_private *mad_send_wr;
1961 struct ib_mad_send_wc mad_send_wc;
1962 unsigned long flags;
1963
1964 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1965 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1966 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1967 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1968 mad_recv_wc);
1969 if (!mad_recv_wc) {
1970 deref_mad_agent(mad_agent_priv);
1971 return;
1972 }
1973 }
1974
1975 /* Complete corresponding request */
1976 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1977 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1978 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1979 if (!mad_send_wr) {
1980 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1981 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1982 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1983 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1984 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1985 /* user rmpp is in effect
1986 * and this is an active RMPP MAD
1987 */
1988 mad_agent_priv->agent.recv_handler(
1989 &mad_agent_priv->agent, NULL,
1990 mad_recv_wc);
1991 atomic_dec(&mad_agent_priv->refcount);
1992 } else {
1993 /* not user rmpp, revert to normal behavior and
1994 * drop the mad */
1995 ib_free_recv_mad(mad_recv_wc);
1996 deref_mad_agent(mad_agent_priv);
1997 return;
1998 }
1999 } else {
2000 ib_mark_mad_done(mad_send_wr);
2001 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2002
2003 /* Defined behavior is to complete response before request */
2004 mad_agent_priv->agent.recv_handler(
2005 &mad_agent_priv->agent,
2006 &mad_send_wr->send_buf,
2007 mad_recv_wc);
2008 atomic_dec(&mad_agent_priv->refcount);
2009
2010 mad_send_wc.status = IB_WC_SUCCESS;
2011 mad_send_wc.vendor_err = 0;
2012 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2013 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2014 }
2015 } else {
2016 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2017 mad_recv_wc);
2018 deref_mad_agent(mad_agent_priv);
2019 }
2020 }
2021
handle_ib_smi(const struct ib_mad_port_private * port_priv,const struct ib_mad_qp_info * qp_info,const struct ib_wc * wc,int port_num,struct ib_mad_private * recv,struct ib_mad_private * response)2022 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2023 const struct ib_mad_qp_info *qp_info,
2024 const struct ib_wc *wc,
2025 int port_num,
2026 struct ib_mad_private *recv,
2027 struct ib_mad_private *response)
2028 {
2029 enum smi_forward_action retsmi;
2030 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2031
2032 if (smi_handle_dr_smp_recv(smp,
2033 rdma_cap_ib_switch(port_priv->device),
2034 port_num,
2035 port_priv->device->phys_port_cnt) ==
2036 IB_SMI_DISCARD)
2037 return IB_SMI_DISCARD;
2038
2039 retsmi = smi_check_forward_dr_smp(smp);
2040 if (retsmi == IB_SMI_LOCAL)
2041 return IB_SMI_HANDLE;
2042
2043 if (retsmi == IB_SMI_SEND) { /* don't forward */
2044 if (smi_handle_dr_smp_send(smp,
2045 rdma_cap_ib_switch(port_priv->device),
2046 port_num) == IB_SMI_DISCARD)
2047 return IB_SMI_DISCARD;
2048
2049 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2050 return IB_SMI_DISCARD;
2051 } else if (rdma_cap_ib_switch(port_priv->device)) {
2052 /* forward case for switches */
2053 memcpy(response, recv, mad_priv_size(response));
2054 response->header.recv_wc.wc = &response->header.wc;
2055 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2056 response->header.recv_wc.recv_buf.grh = &response->grh;
2057
2058 agent_send_response((const struct ib_mad_hdr *)response->mad,
2059 &response->grh, wc,
2060 port_priv->device,
2061 smi_get_fwd_port(smp),
2062 qp_info->qp->qp_num,
2063 response->mad_size,
2064 false);
2065
2066 return IB_SMI_DISCARD;
2067 }
2068 return IB_SMI_HANDLE;
2069 }
2070
generate_unmatched_resp(const struct ib_mad_private * recv,struct ib_mad_private * response,size_t * resp_len,bool opa)2071 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2072 struct ib_mad_private *response,
2073 size_t *resp_len, bool opa)
2074 {
2075 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2076 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2077
2078 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2079 recv_hdr->method == IB_MGMT_METHOD_SET) {
2080 memcpy(response, recv, mad_priv_size(response));
2081 response->header.recv_wc.wc = &response->header.wc;
2082 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2083 response->header.recv_wc.recv_buf.grh = &response->grh;
2084 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2085 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2086 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2087 resp_hdr->status |= IB_SMP_DIRECTION;
2088
2089 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2090 if (recv_hdr->mgmt_class ==
2091 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2092 recv_hdr->mgmt_class ==
2093 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2094 *resp_len = opa_get_smp_header_size(
2095 (const struct opa_smp *)recv->mad);
2096 else
2097 *resp_len = sizeof(struct ib_mad_hdr);
2098 }
2099
2100 return true;
2101 } else {
2102 return false;
2103 }
2104 }
2105
2106 static enum smi_action
handle_opa_smi(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info,struct ib_wc * wc,int port_num,struct ib_mad_private * recv,struct ib_mad_private * response)2107 handle_opa_smi(struct ib_mad_port_private *port_priv,
2108 struct ib_mad_qp_info *qp_info,
2109 struct ib_wc *wc,
2110 int port_num,
2111 struct ib_mad_private *recv,
2112 struct ib_mad_private *response)
2113 {
2114 enum smi_forward_action retsmi;
2115 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2116
2117 if (opa_smi_handle_dr_smp_recv(smp,
2118 rdma_cap_ib_switch(port_priv->device),
2119 port_num,
2120 port_priv->device->phys_port_cnt) ==
2121 IB_SMI_DISCARD)
2122 return IB_SMI_DISCARD;
2123
2124 retsmi = opa_smi_check_forward_dr_smp(smp);
2125 if (retsmi == IB_SMI_LOCAL)
2126 return IB_SMI_HANDLE;
2127
2128 if (retsmi == IB_SMI_SEND) { /* don't forward */
2129 if (opa_smi_handle_dr_smp_send(smp,
2130 rdma_cap_ib_switch(port_priv->device),
2131 port_num) == IB_SMI_DISCARD)
2132 return IB_SMI_DISCARD;
2133
2134 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2135 IB_SMI_DISCARD)
2136 return IB_SMI_DISCARD;
2137
2138 } else if (rdma_cap_ib_switch(port_priv->device)) {
2139 /* forward case for switches */
2140 memcpy(response, recv, mad_priv_size(response));
2141 response->header.recv_wc.wc = &response->header.wc;
2142 response->header.recv_wc.recv_buf.opa_mad =
2143 (struct opa_mad *)response->mad;
2144 response->header.recv_wc.recv_buf.grh = &response->grh;
2145
2146 agent_send_response((const struct ib_mad_hdr *)response->mad,
2147 &response->grh, wc,
2148 port_priv->device,
2149 opa_smi_get_fwd_port(smp),
2150 qp_info->qp->qp_num,
2151 recv->header.wc.byte_len,
2152 true);
2153
2154 return IB_SMI_DISCARD;
2155 }
2156
2157 return IB_SMI_HANDLE;
2158 }
2159
2160 static enum smi_action
handle_smi(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info,struct ib_wc * wc,int port_num,struct ib_mad_private * recv,struct ib_mad_private * response,bool opa)2161 handle_smi(struct ib_mad_port_private *port_priv,
2162 struct ib_mad_qp_info *qp_info,
2163 struct ib_wc *wc,
2164 int port_num,
2165 struct ib_mad_private *recv,
2166 struct ib_mad_private *response,
2167 bool opa)
2168 {
2169 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2170
2171 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2172 mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
2173 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2174 response);
2175
2176 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2177 }
2178
ib_mad_recv_done(struct ib_cq * cq,struct ib_wc * wc)2179 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2180 {
2181 struct ib_mad_port_private *port_priv = cq->cq_context;
2182 struct ib_mad_list_head *mad_list =
2183 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2184 struct ib_mad_qp_info *qp_info;
2185 struct ib_mad_private_header *mad_priv_hdr;
2186 struct ib_mad_private *recv, *response = NULL;
2187 struct ib_mad_agent_private *mad_agent;
2188 int port_num;
2189 int ret = IB_MAD_RESULT_SUCCESS;
2190 size_t mad_size;
2191 u16 resp_mad_pkey_index = 0;
2192 bool opa;
2193
2194 if (list_empty_careful(&port_priv->port_list))
2195 return;
2196
2197 if (wc->status != IB_WC_SUCCESS) {
2198 /*
2199 * Receive errors indicate that the QP has entered the error
2200 * state - error handling/shutdown code will cleanup
2201 */
2202 return;
2203 }
2204
2205 qp_info = mad_list->mad_queue->qp_info;
2206 dequeue_mad(mad_list);
2207
2208 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2209 qp_info->port_priv->port_num);
2210
2211 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2212 mad_list);
2213 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2214 ib_dma_unmap_single(port_priv->device,
2215 recv->header.mapping,
2216 mad_priv_dma_size(recv),
2217 DMA_FROM_DEVICE);
2218
2219 /* Setup MAD receive work completion from "normal" work completion */
2220 recv->header.wc = *wc;
2221 recv->header.recv_wc.wc = &recv->header.wc;
2222
2223 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2224 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2225 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2226 } else {
2227 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2228 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2229 }
2230
2231 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2232 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2233
2234 if (atomic_read(&qp_info->snoop_count))
2235 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2236
2237 /* Validate MAD */
2238 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2239 goto out;
2240
2241 mad_size = recv->mad_size;
2242 response = alloc_mad_private(mad_size, GFP_KERNEL);
2243 if (!response)
2244 goto out;
2245
2246 if (rdma_cap_ib_switch(port_priv->device))
2247 port_num = wc->port_num;
2248 else
2249 port_num = port_priv->port_num;
2250
2251 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2252 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2253 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2254 response, opa)
2255 == IB_SMI_DISCARD)
2256 goto out;
2257 }
2258
2259 /* Give driver "right of first refusal" on incoming MAD */
2260 if (port_priv->device->process_mad) {
2261 ret = port_priv->device->process_mad(port_priv->device, 0,
2262 port_priv->port_num,
2263 wc, &recv->grh,
2264 (const struct ib_mad_hdr *)recv->mad,
2265 recv->mad_size,
2266 (struct ib_mad_hdr *)response->mad,
2267 &mad_size, &resp_mad_pkey_index);
2268
2269 if (opa)
2270 wc->pkey_index = resp_mad_pkey_index;
2271
2272 if (ret & IB_MAD_RESULT_SUCCESS) {
2273 if (ret & IB_MAD_RESULT_CONSUMED)
2274 goto out;
2275 if (ret & IB_MAD_RESULT_REPLY) {
2276 agent_send_response((const struct ib_mad_hdr *)response->mad,
2277 &recv->grh, wc,
2278 port_priv->device,
2279 port_num,
2280 qp_info->qp->qp_num,
2281 mad_size, opa);
2282 goto out;
2283 }
2284 }
2285 }
2286
2287 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2288 if (mad_agent) {
2289 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2290 /*
2291 * recv is freed up in error cases in ib_mad_complete_recv
2292 * or via recv_handler in ib_mad_complete_recv()
2293 */
2294 recv = NULL;
2295 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2296 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2297 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2298 port_priv->device, port_num,
2299 qp_info->qp->qp_num, mad_size, opa);
2300 }
2301
2302 out:
2303 /* Post another receive request for this QP */
2304 if (response) {
2305 ib_mad_post_receive_mads(qp_info, response);
2306 kfree(recv);
2307 } else
2308 ib_mad_post_receive_mads(qp_info, recv);
2309 }
2310
adjust_timeout(struct ib_mad_agent_private * mad_agent_priv)2311 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2312 {
2313 struct ib_mad_send_wr_private *mad_send_wr;
2314 unsigned long delay;
2315
2316 if (list_empty(&mad_agent_priv->wait_list)) {
2317 cancel_delayed_work(&mad_agent_priv->timed_work);
2318 } else {
2319 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2320 struct ib_mad_send_wr_private,
2321 agent_list);
2322
2323 if (time_after(mad_agent_priv->timeout,
2324 mad_send_wr->timeout)) {
2325 mad_agent_priv->timeout = mad_send_wr->timeout;
2326 delay = mad_send_wr->timeout - jiffies;
2327 if ((long)delay <= 0)
2328 delay = 1;
2329 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2330 &mad_agent_priv->timed_work, delay);
2331 }
2332 }
2333 }
2334
wait_for_response(struct ib_mad_send_wr_private * mad_send_wr)2335 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2336 {
2337 struct ib_mad_agent_private *mad_agent_priv;
2338 struct ib_mad_send_wr_private *temp_mad_send_wr;
2339 struct list_head *list_item;
2340 unsigned long delay;
2341
2342 mad_agent_priv = mad_send_wr->mad_agent_priv;
2343 list_del(&mad_send_wr->agent_list);
2344
2345 delay = mad_send_wr->timeout;
2346 mad_send_wr->timeout += jiffies;
2347
2348 if (delay) {
2349 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2350 temp_mad_send_wr = list_entry(list_item,
2351 struct ib_mad_send_wr_private,
2352 agent_list);
2353 if (time_after(mad_send_wr->timeout,
2354 temp_mad_send_wr->timeout))
2355 break;
2356 }
2357 }
2358 else
2359 list_item = &mad_agent_priv->wait_list;
2360 list_add(&mad_send_wr->agent_list, list_item);
2361
2362 /* Reschedule a work item if we have a shorter timeout */
2363 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2364 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2365 &mad_agent_priv->timed_work, delay);
2366 }
2367
ib_reset_mad_timeout(struct ib_mad_send_wr_private * mad_send_wr,int timeout_ms)2368 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2369 int timeout_ms)
2370 {
2371 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2372 wait_for_response(mad_send_wr);
2373 }
2374
2375 /*
2376 * Process a send work completion
2377 */
ib_mad_complete_send_wr(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)2378 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2379 struct ib_mad_send_wc *mad_send_wc)
2380 {
2381 struct ib_mad_agent_private *mad_agent_priv;
2382 unsigned long flags;
2383 int ret;
2384
2385 mad_agent_priv = mad_send_wr->mad_agent_priv;
2386 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2387 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2388 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2389 if (ret == IB_RMPP_RESULT_CONSUMED)
2390 goto done;
2391 } else
2392 ret = IB_RMPP_RESULT_UNHANDLED;
2393
2394 if (mad_send_wc->status != IB_WC_SUCCESS &&
2395 mad_send_wr->status == IB_WC_SUCCESS) {
2396 mad_send_wr->status = mad_send_wc->status;
2397 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2398 }
2399
2400 if (--mad_send_wr->refcount > 0) {
2401 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2402 mad_send_wr->status == IB_WC_SUCCESS) {
2403 wait_for_response(mad_send_wr);
2404 }
2405 goto done;
2406 }
2407
2408 /* Remove send from MAD agent and notify client of completion */
2409 list_del(&mad_send_wr->agent_list);
2410 adjust_timeout(mad_agent_priv);
2411 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2412
2413 if (mad_send_wr->status != IB_WC_SUCCESS )
2414 mad_send_wc->status = mad_send_wr->status;
2415 if (ret == IB_RMPP_RESULT_INTERNAL)
2416 ib_rmpp_send_handler(mad_send_wc);
2417 else
2418 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2419 mad_send_wc);
2420
2421 /* Release reference on agent taken when sending */
2422 deref_mad_agent(mad_agent_priv);
2423 return;
2424 done:
2425 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2426 }
2427
ib_mad_send_done(struct ib_cq * cq,struct ib_wc * wc)2428 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2429 {
2430 struct ib_mad_port_private *port_priv = cq->cq_context;
2431 struct ib_mad_list_head *mad_list =
2432 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2433 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2434 struct ib_mad_qp_info *qp_info;
2435 struct ib_mad_queue *send_queue;
2436 struct ib_mad_send_wc mad_send_wc;
2437 unsigned long flags;
2438 int ret;
2439
2440 if (list_empty_careful(&port_priv->port_list))
2441 return;
2442
2443 if (wc->status != IB_WC_SUCCESS) {
2444 if (!ib_mad_send_error(port_priv, wc))
2445 return;
2446 }
2447
2448 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2449 mad_list);
2450 send_queue = mad_list->mad_queue;
2451 qp_info = send_queue->qp_info;
2452
2453 retry:
2454 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2455 mad_send_wr->header_mapping,
2456 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2457 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2458 mad_send_wr->payload_mapping,
2459 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2460 queued_send_wr = NULL;
2461 spin_lock_irqsave(&send_queue->lock, flags);
2462 list_del(&mad_list->list);
2463
2464 /* Move queued send to the send queue */
2465 if (send_queue->count-- > send_queue->max_active) {
2466 mad_list = container_of(qp_info->overflow_list.next,
2467 struct ib_mad_list_head, list);
2468 queued_send_wr = container_of(mad_list,
2469 struct ib_mad_send_wr_private,
2470 mad_list);
2471 list_move_tail(&mad_list->list, &send_queue->list);
2472 }
2473 spin_unlock_irqrestore(&send_queue->lock, flags);
2474
2475 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2476 mad_send_wc.status = wc->status;
2477 mad_send_wc.vendor_err = wc->vendor_err;
2478 if (atomic_read(&qp_info->snoop_count))
2479 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2480 IB_MAD_SNOOP_SEND_COMPLETIONS);
2481 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2482
2483 if (queued_send_wr) {
2484 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2485 NULL);
2486 if (ret) {
2487 dev_err(&port_priv->device->dev,
2488 "ib_post_send failed: %d\n", ret);
2489 mad_send_wr = queued_send_wr;
2490 wc->status = IB_WC_LOC_QP_OP_ERR;
2491 goto retry;
2492 }
2493 }
2494 }
2495
mark_sends_for_retry(struct ib_mad_qp_info * qp_info)2496 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2497 {
2498 struct ib_mad_send_wr_private *mad_send_wr;
2499 struct ib_mad_list_head *mad_list;
2500 unsigned long flags;
2501
2502 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2503 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2504 mad_send_wr = container_of(mad_list,
2505 struct ib_mad_send_wr_private,
2506 mad_list);
2507 mad_send_wr->retry = 1;
2508 }
2509 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2510 }
2511
ib_mad_send_error(struct ib_mad_port_private * port_priv,struct ib_wc * wc)2512 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2513 struct ib_wc *wc)
2514 {
2515 struct ib_mad_list_head *mad_list =
2516 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2517 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2518 struct ib_mad_send_wr_private *mad_send_wr;
2519 int ret;
2520
2521 /*
2522 * Send errors will transition the QP to SQE - move
2523 * QP to RTS and repost flushed work requests
2524 */
2525 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2526 mad_list);
2527 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2528 if (mad_send_wr->retry) {
2529 /* Repost send */
2530 mad_send_wr->retry = 0;
2531 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2532 NULL);
2533 if (!ret)
2534 return false;
2535 }
2536 } else {
2537 struct ib_qp_attr *attr;
2538
2539 /* Transition QP to RTS and fail offending send */
2540 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2541 if (attr) {
2542 attr->qp_state = IB_QPS_RTS;
2543 attr->cur_qp_state = IB_QPS_SQE;
2544 ret = ib_modify_qp(qp_info->qp, attr,
2545 IB_QP_STATE | IB_QP_CUR_STATE);
2546 kfree(attr);
2547 if (ret)
2548 dev_err(&port_priv->device->dev,
2549 "%s - ib_modify_qp to RTS: %d\n",
2550 __func__, ret);
2551 else
2552 mark_sends_for_retry(qp_info);
2553 }
2554 }
2555
2556 return true;
2557 }
2558
cancel_mads(struct ib_mad_agent_private * mad_agent_priv)2559 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2560 {
2561 unsigned long flags;
2562 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2563 struct ib_mad_send_wc mad_send_wc;
2564 struct list_head cancel_list;
2565
2566 INIT_LIST_HEAD(&cancel_list);
2567
2568 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2569 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2570 &mad_agent_priv->send_list, agent_list) {
2571 if (mad_send_wr->status == IB_WC_SUCCESS) {
2572 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2573 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2574 }
2575 }
2576
2577 /* Empty wait list to prevent receives from finding a request */
2578 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2579 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2580
2581 /* Report all cancelled requests */
2582 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2583 mad_send_wc.vendor_err = 0;
2584
2585 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2586 &cancel_list, agent_list) {
2587 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2588 list_del(&mad_send_wr->agent_list);
2589 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2590 &mad_send_wc);
2591 atomic_dec(&mad_agent_priv->refcount);
2592 }
2593 }
2594
2595 static struct ib_mad_send_wr_private*
find_send_wr(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_buf * send_buf)2596 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2597 struct ib_mad_send_buf *send_buf)
2598 {
2599 struct ib_mad_send_wr_private *mad_send_wr;
2600
2601 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2602 agent_list) {
2603 if (&mad_send_wr->send_buf == send_buf)
2604 return mad_send_wr;
2605 }
2606
2607 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2608 agent_list) {
2609 if (is_rmpp_data_mad(mad_agent_priv,
2610 mad_send_wr->send_buf.mad) &&
2611 &mad_send_wr->send_buf == send_buf)
2612 return mad_send_wr;
2613 }
2614 return NULL;
2615 }
2616
ib_modify_mad(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf,u32 timeout_ms)2617 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2618 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2619 {
2620 struct ib_mad_agent_private *mad_agent_priv;
2621 struct ib_mad_send_wr_private *mad_send_wr;
2622 unsigned long flags;
2623 int active;
2624
2625 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2626 agent);
2627 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2628 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2629 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2630 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2631 return -EINVAL;
2632 }
2633
2634 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2635 if (!timeout_ms) {
2636 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2637 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2638 }
2639
2640 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2641 if (active)
2642 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2643 else
2644 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2645
2646 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2647 return 0;
2648 }
2649 EXPORT_SYMBOL(ib_modify_mad);
2650
ib_cancel_mad(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf)2651 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2652 struct ib_mad_send_buf *send_buf)
2653 {
2654 ib_modify_mad(mad_agent, send_buf, 0);
2655 }
2656 EXPORT_SYMBOL(ib_cancel_mad);
2657
local_completions(struct work_struct * work)2658 static void local_completions(struct work_struct *work)
2659 {
2660 struct ib_mad_agent_private *mad_agent_priv;
2661 struct ib_mad_local_private *local;
2662 struct ib_mad_agent_private *recv_mad_agent;
2663 unsigned long flags;
2664 int free_mad;
2665 struct ib_wc wc;
2666 struct ib_mad_send_wc mad_send_wc;
2667 bool opa;
2668
2669 mad_agent_priv =
2670 container_of(work, struct ib_mad_agent_private, local_work);
2671
2672 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2673 mad_agent_priv->qp_info->port_priv->port_num);
2674
2675 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2676 while (!list_empty(&mad_agent_priv->local_list)) {
2677 local = list_entry(mad_agent_priv->local_list.next,
2678 struct ib_mad_local_private,
2679 completion_list);
2680 list_del(&local->completion_list);
2681 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2682 free_mad = 0;
2683 if (local->mad_priv) {
2684 u8 base_version;
2685 recv_mad_agent = local->recv_mad_agent;
2686 if (!recv_mad_agent) {
2687 dev_err(&mad_agent_priv->agent.device->dev,
2688 "No receive MAD agent for local completion\n");
2689 free_mad = 1;
2690 goto local_send_completion;
2691 }
2692
2693 /*
2694 * Defined behavior is to complete response
2695 * before request
2696 */
2697 build_smp_wc(recv_mad_agent->agent.qp,
2698 local->mad_send_wr->send_wr.wr.wr_cqe,
2699 be16_to_cpu(IB_LID_PERMISSIVE),
2700 local->mad_send_wr->send_wr.pkey_index,
2701 recv_mad_agent->agent.port_num, &wc);
2702
2703 local->mad_priv->header.recv_wc.wc = &wc;
2704
2705 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2706 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2707 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2708 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2709 } else {
2710 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2711 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2712 }
2713
2714 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2715 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2716 &local->mad_priv->header.recv_wc.rmpp_list);
2717 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2718 local->mad_priv->header.recv_wc.recv_buf.mad =
2719 (struct ib_mad *)local->mad_priv->mad;
2720 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2721 snoop_recv(recv_mad_agent->qp_info,
2722 &local->mad_priv->header.recv_wc,
2723 IB_MAD_SNOOP_RECVS);
2724 recv_mad_agent->agent.recv_handler(
2725 &recv_mad_agent->agent,
2726 &local->mad_send_wr->send_buf,
2727 &local->mad_priv->header.recv_wc);
2728 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2729 atomic_dec(&recv_mad_agent->refcount);
2730 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2731 }
2732
2733 local_send_completion:
2734 /* Complete send */
2735 mad_send_wc.status = IB_WC_SUCCESS;
2736 mad_send_wc.vendor_err = 0;
2737 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2738 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2739 snoop_send(mad_agent_priv->qp_info,
2740 &local->mad_send_wr->send_buf,
2741 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2742 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2743 &mad_send_wc);
2744
2745 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2746 atomic_dec(&mad_agent_priv->refcount);
2747 if (free_mad)
2748 kfree(local->mad_priv);
2749 kfree(local);
2750 }
2751 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2752 }
2753
retry_send(struct ib_mad_send_wr_private * mad_send_wr)2754 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2755 {
2756 int ret;
2757
2758 if (!mad_send_wr->retries_left)
2759 return -ETIMEDOUT;
2760
2761 mad_send_wr->retries_left--;
2762 mad_send_wr->send_buf.retries++;
2763
2764 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2765
2766 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2767 ret = ib_retry_rmpp(mad_send_wr);
2768 switch (ret) {
2769 case IB_RMPP_RESULT_UNHANDLED:
2770 ret = ib_send_mad(mad_send_wr);
2771 break;
2772 case IB_RMPP_RESULT_CONSUMED:
2773 ret = 0;
2774 break;
2775 default:
2776 ret = -ECOMM;
2777 break;
2778 }
2779 } else
2780 ret = ib_send_mad(mad_send_wr);
2781
2782 if (!ret) {
2783 mad_send_wr->refcount++;
2784 list_add_tail(&mad_send_wr->agent_list,
2785 &mad_send_wr->mad_agent_priv->send_list);
2786 }
2787 return ret;
2788 }
2789
timeout_sends(struct work_struct * work)2790 static void timeout_sends(struct work_struct *work)
2791 {
2792 struct ib_mad_agent_private *mad_agent_priv;
2793 struct ib_mad_send_wr_private *mad_send_wr;
2794 struct ib_mad_send_wc mad_send_wc;
2795 unsigned long flags, delay;
2796
2797 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2798 timed_work.work);
2799 mad_send_wc.vendor_err = 0;
2800
2801 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2802 while (!list_empty(&mad_agent_priv->wait_list)) {
2803 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2804 struct ib_mad_send_wr_private,
2805 agent_list);
2806
2807 if (time_after(mad_send_wr->timeout, jiffies)) {
2808 delay = mad_send_wr->timeout - jiffies;
2809 if ((long)delay <= 0)
2810 delay = 1;
2811 queue_delayed_work(mad_agent_priv->qp_info->
2812 port_priv->wq,
2813 &mad_agent_priv->timed_work, delay);
2814 break;
2815 }
2816
2817 list_del(&mad_send_wr->agent_list);
2818 if (mad_send_wr->status == IB_WC_SUCCESS &&
2819 !retry_send(mad_send_wr))
2820 continue;
2821
2822 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2823
2824 if (mad_send_wr->status == IB_WC_SUCCESS)
2825 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2826 else
2827 mad_send_wc.status = mad_send_wr->status;
2828 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2829 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2830 &mad_send_wc);
2831
2832 atomic_dec(&mad_agent_priv->refcount);
2833 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2834 }
2835 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2836 }
2837
2838 /*
2839 * Allocate receive MADs and post receive WRs for them
2840 */
ib_mad_post_receive_mads(struct ib_mad_qp_info * qp_info,struct ib_mad_private * mad)2841 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2842 struct ib_mad_private *mad)
2843 {
2844 unsigned long flags;
2845 int post, ret;
2846 struct ib_mad_private *mad_priv;
2847 struct ib_sge sg_list;
2848 struct ib_recv_wr recv_wr;
2849 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2850
2851 /* Initialize common scatter list fields */
2852 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2853
2854 /* Initialize common receive WR fields */
2855 recv_wr.next = NULL;
2856 recv_wr.sg_list = &sg_list;
2857 recv_wr.num_sge = 1;
2858
2859 do {
2860 /* Allocate and map receive buffer */
2861 if (mad) {
2862 mad_priv = mad;
2863 mad = NULL;
2864 } else {
2865 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2866 GFP_ATOMIC);
2867 if (!mad_priv) {
2868 ret = -ENOMEM;
2869 break;
2870 }
2871 }
2872 sg_list.length = mad_priv_dma_size(mad_priv);
2873 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2874 &mad_priv->grh,
2875 mad_priv_dma_size(mad_priv),
2876 DMA_FROM_DEVICE);
2877 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2878 sg_list.addr))) {
2879 kfree(mad_priv);
2880 ret = -ENOMEM;
2881 break;
2882 }
2883 mad_priv->header.mapping = sg_list.addr;
2884 mad_priv->header.mad_list.mad_queue = recv_queue;
2885 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2886 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2887
2888 /* Post receive WR */
2889 spin_lock_irqsave(&recv_queue->lock, flags);
2890 post = (++recv_queue->count < recv_queue->max_active);
2891 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2892 spin_unlock_irqrestore(&recv_queue->lock, flags);
2893 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
2894 if (ret) {
2895 spin_lock_irqsave(&recv_queue->lock, flags);
2896 list_del(&mad_priv->header.mad_list.list);
2897 recv_queue->count--;
2898 spin_unlock_irqrestore(&recv_queue->lock, flags);
2899 ib_dma_unmap_single(qp_info->port_priv->device,
2900 mad_priv->header.mapping,
2901 mad_priv_dma_size(mad_priv),
2902 DMA_FROM_DEVICE);
2903 kfree(mad_priv);
2904 dev_err(&qp_info->port_priv->device->dev,
2905 "ib_post_recv failed: %d\n", ret);
2906 break;
2907 }
2908 } while (post);
2909
2910 return ret;
2911 }
2912
2913 /*
2914 * Return all the posted receive MADs
2915 */
cleanup_recv_queue(struct ib_mad_qp_info * qp_info)2916 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2917 {
2918 struct ib_mad_private_header *mad_priv_hdr;
2919 struct ib_mad_private *recv;
2920 struct ib_mad_list_head *mad_list;
2921
2922 if (!qp_info->qp)
2923 return;
2924
2925 while (!list_empty(&qp_info->recv_queue.list)) {
2926
2927 mad_list = list_entry(qp_info->recv_queue.list.next,
2928 struct ib_mad_list_head, list);
2929 mad_priv_hdr = container_of(mad_list,
2930 struct ib_mad_private_header,
2931 mad_list);
2932 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2933 header);
2934
2935 /* Remove from posted receive MAD list */
2936 list_del(&mad_list->list);
2937
2938 ib_dma_unmap_single(qp_info->port_priv->device,
2939 recv->header.mapping,
2940 mad_priv_dma_size(recv),
2941 DMA_FROM_DEVICE);
2942 kfree(recv);
2943 }
2944
2945 qp_info->recv_queue.count = 0;
2946 }
2947
2948 /*
2949 * Start the port
2950 */
ib_mad_port_start(struct ib_mad_port_private * port_priv)2951 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2952 {
2953 int ret, i;
2954 struct ib_qp_attr *attr;
2955 struct ib_qp *qp;
2956 u16 pkey_index;
2957
2958 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2959 if (!attr)
2960 return -ENOMEM;
2961
2962 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2963 IB_DEFAULT_PKEY_FULL, &pkey_index);
2964 if (ret)
2965 pkey_index = 0;
2966
2967 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2968 qp = port_priv->qp_info[i].qp;
2969 if (!qp)
2970 continue;
2971
2972 /*
2973 * PKey index for QP1 is irrelevant but
2974 * one is needed for the Reset to Init transition
2975 */
2976 attr->qp_state = IB_QPS_INIT;
2977 attr->pkey_index = pkey_index;
2978 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2979 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2980 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2981 if (ret) {
2982 dev_err(&port_priv->device->dev,
2983 "Couldn't change QP%d state to INIT: %d\n",
2984 i, ret);
2985 goto out;
2986 }
2987
2988 attr->qp_state = IB_QPS_RTR;
2989 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2990 if (ret) {
2991 dev_err(&port_priv->device->dev,
2992 "Couldn't change QP%d state to RTR: %d\n",
2993 i, ret);
2994 goto out;
2995 }
2996
2997 attr->qp_state = IB_QPS_RTS;
2998 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2999 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3000 if (ret) {
3001 dev_err(&port_priv->device->dev,
3002 "Couldn't change QP%d state to RTS: %d\n",
3003 i, ret);
3004 goto out;
3005 }
3006 }
3007
3008 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3009 if (ret) {
3010 dev_err(&port_priv->device->dev,
3011 "Failed to request completion notification: %d\n",
3012 ret);
3013 goto out;
3014 }
3015
3016 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3017 if (!port_priv->qp_info[i].qp)
3018 continue;
3019
3020 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3021 if (ret) {
3022 dev_err(&port_priv->device->dev,
3023 "Couldn't post receive WRs\n");
3024 goto out;
3025 }
3026 }
3027 out:
3028 kfree(attr);
3029 return ret;
3030 }
3031
qp_event_handler(struct ib_event * event,void * qp_context)3032 static void qp_event_handler(struct ib_event *event, void *qp_context)
3033 {
3034 struct ib_mad_qp_info *qp_info = qp_context;
3035
3036 /* It's worse than that! He's dead, Jim! */
3037 dev_err(&qp_info->port_priv->device->dev,
3038 "Fatal error (%d) on MAD QP (%d)\n",
3039 event->event, qp_info->qp->qp_num);
3040 }
3041
init_mad_queue(struct ib_mad_qp_info * qp_info,struct ib_mad_queue * mad_queue)3042 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3043 struct ib_mad_queue *mad_queue)
3044 {
3045 mad_queue->qp_info = qp_info;
3046 mad_queue->count = 0;
3047 spin_lock_init(&mad_queue->lock);
3048 INIT_LIST_HEAD(&mad_queue->list);
3049 }
3050
init_mad_qp(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info)3051 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3052 struct ib_mad_qp_info *qp_info)
3053 {
3054 qp_info->port_priv = port_priv;
3055 init_mad_queue(qp_info, &qp_info->send_queue);
3056 init_mad_queue(qp_info, &qp_info->recv_queue);
3057 INIT_LIST_HEAD(&qp_info->overflow_list);
3058 spin_lock_init(&qp_info->snoop_lock);
3059 qp_info->snoop_table = NULL;
3060 qp_info->snoop_table_size = 0;
3061 atomic_set(&qp_info->snoop_count, 0);
3062 }
3063
create_mad_qp(struct ib_mad_qp_info * qp_info,enum ib_qp_type qp_type)3064 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3065 enum ib_qp_type qp_type)
3066 {
3067 struct ib_qp_init_attr qp_init_attr;
3068 int ret;
3069
3070 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3071 qp_init_attr.send_cq = qp_info->port_priv->cq;
3072 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3073 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3074 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3075 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3076 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3077 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3078 qp_init_attr.qp_type = qp_type;
3079 qp_init_attr.port_num = qp_info->port_priv->port_num;
3080 qp_init_attr.qp_context = qp_info;
3081 qp_init_attr.event_handler = qp_event_handler;
3082 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3083 if (IS_ERR(qp_info->qp)) {
3084 dev_err(&qp_info->port_priv->device->dev,
3085 "Couldn't create ib_mad QP%d\n",
3086 get_spl_qp_index(qp_type));
3087 ret = PTR_ERR(qp_info->qp);
3088 goto error;
3089 }
3090 /* Use minimum queue sizes unless the CQ is resized */
3091 qp_info->send_queue.max_active = mad_sendq_size;
3092 qp_info->recv_queue.max_active = mad_recvq_size;
3093 return 0;
3094
3095 error:
3096 return ret;
3097 }
3098
destroy_mad_qp(struct ib_mad_qp_info * qp_info)3099 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3100 {
3101 if (!qp_info->qp)
3102 return;
3103
3104 ib_destroy_qp(qp_info->qp);
3105 kfree(qp_info->snoop_table);
3106 }
3107
3108 /*
3109 * Open the port
3110 * Create the QP, PD, MR, and CQ if needed
3111 */
ib_mad_port_open(struct ib_device * device,int port_num)3112 static int ib_mad_port_open(struct ib_device *device,
3113 int port_num)
3114 {
3115 int ret, cq_size;
3116 struct ib_mad_port_private *port_priv;
3117 unsigned long flags;
3118 char name[sizeof "ib_mad123"];
3119 int has_smi;
3120
3121 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3122 return -EFAULT;
3123
3124 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3125 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3126 return -EFAULT;
3127
3128 /* Create new device info */
3129 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3130 if (!port_priv)
3131 return -ENOMEM;
3132
3133 port_priv->device = device;
3134 port_priv->port_num = port_num;
3135 spin_lock_init(&port_priv->reg_lock);
3136 INIT_LIST_HEAD(&port_priv->agent_list);
3137 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3138 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3139
3140 cq_size = mad_sendq_size + mad_recvq_size;
3141 has_smi = rdma_cap_ib_smi(device, port_num);
3142 if (has_smi)
3143 cq_size *= 2;
3144
3145 port_priv->pd = ib_alloc_pd(device, 0);
3146 if (IS_ERR(port_priv->pd)) {
3147 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3148 ret = PTR_ERR(port_priv->pd);
3149 goto error3;
3150 }
3151
3152 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3153 IB_POLL_WORKQUEUE);
3154 if (IS_ERR(port_priv->cq)) {
3155 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3156 ret = PTR_ERR(port_priv->cq);
3157 goto error4;
3158 }
3159
3160 if (has_smi) {
3161 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3162 if (ret)
3163 goto error6;
3164 }
3165 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3166 if (ret)
3167 goto error7;
3168
3169 snprintf(name, sizeof name, "ib_mad%d", port_num);
3170 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3171 if (!port_priv->wq) {
3172 ret = -ENOMEM;
3173 goto error8;
3174 }
3175
3176 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3177 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3178 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3179
3180 ret = ib_mad_port_start(port_priv);
3181 if (ret) {
3182 dev_err(&device->dev, "Couldn't start port\n");
3183 goto error9;
3184 }
3185
3186 return 0;
3187
3188 error9:
3189 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3190 list_del_init(&port_priv->port_list);
3191 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3192
3193 destroy_workqueue(port_priv->wq);
3194 error8:
3195 destroy_mad_qp(&port_priv->qp_info[1]);
3196 error7:
3197 destroy_mad_qp(&port_priv->qp_info[0]);
3198 error6:
3199 ib_free_cq(port_priv->cq);
3200 cleanup_recv_queue(&port_priv->qp_info[1]);
3201 cleanup_recv_queue(&port_priv->qp_info[0]);
3202 error4:
3203 ib_dealloc_pd(port_priv->pd);
3204 error3:
3205 kfree(port_priv);
3206
3207 return ret;
3208 }
3209
3210 /*
3211 * Close the port
3212 * If there are no classes using the port, free the port
3213 * resources (CQ, MR, PD, QP) and remove the port's info structure
3214 */
ib_mad_port_close(struct ib_device * device,int port_num)3215 static int ib_mad_port_close(struct ib_device *device, int port_num)
3216 {
3217 struct ib_mad_port_private *port_priv;
3218 unsigned long flags;
3219
3220 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3221 port_priv = __ib_get_mad_port(device, port_num);
3222 if (port_priv == NULL) {
3223 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3224 dev_err(&device->dev, "Port %d not found\n", port_num);
3225 return -ENODEV;
3226 }
3227 list_del_init(&port_priv->port_list);
3228 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3229
3230 destroy_workqueue(port_priv->wq);
3231 destroy_mad_qp(&port_priv->qp_info[1]);
3232 destroy_mad_qp(&port_priv->qp_info[0]);
3233 ib_free_cq(port_priv->cq);
3234 ib_dealloc_pd(port_priv->pd);
3235 cleanup_recv_queue(&port_priv->qp_info[1]);
3236 cleanup_recv_queue(&port_priv->qp_info[0]);
3237 /* XXX: Handle deallocation of MAD registration tables */
3238
3239 kfree(port_priv);
3240
3241 return 0;
3242 }
3243
ib_mad_init_device(struct ib_device * device)3244 static void ib_mad_init_device(struct ib_device *device)
3245 {
3246 int start, i;
3247
3248 start = rdma_start_port(device);
3249
3250 for (i = start; i <= rdma_end_port(device); i++) {
3251 if (!rdma_cap_ib_mad(device, i))
3252 continue;
3253
3254 if (ib_mad_port_open(device, i)) {
3255 dev_err(&device->dev, "Couldn't open port %d\n", i);
3256 goto error;
3257 }
3258 if (ib_agent_port_open(device, i)) {
3259 dev_err(&device->dev,
3260 "Couldn't open port %d for agents\n", i);
3261 goto error_agent;
3262 }
3263 }
3264 return;
3265
3266 error_agent:
3267 if (ib_mad_port_close(device, i))
3268 dev_err(&device->dev, "Couldn't close port %d\n", i);
3269
3270 error:
3271 while (--i >= start) {
3272 if (!rdma_cap_ib_mad(device, i))
3273 continue;
3274
3275 if (ib_agent_port_close(device, i))
3276 dev_err(&device->dev,
3277 "Couldn't close port %d for agents\n", i);
3278 if (ib_mad_port_close(device, i))
3279 dev_err(&device->dev, "Couldn't close port %d\n", i);
3280 }
3281 }
3282
ib_mad_remove_device(struct ib_device * device,void * client_data)3283 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3284 {
3285 int i;
3286
3287 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3288 if (!rdma_cap_ib_mad(device, i))
3289 continue;
3290
3291 if (ib_agent_port_close(device, i))
3292 dev_err(&device->dev,
3293 "Couldn't close port %d for agents\n", i);
3294 if (ib_mad_port_close(device, i))
3295 dev_err(&device->dev, "Couldn't close port %d\n", i);
3296 }
3297 }
3298
3299 static struct ib_client mad_client = {
3300 .name = "mad",
3301 .add = ib_mad_init_device,
3302 .remove = ib_mad_remove_device
3303 };
3304
ib_mad_init(void)3305 int ib_mad_init(void)
3306 {
3307 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3308 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3309
3310 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3311 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3312
3313 INIT_LIST_HEAD(&ib_mad_port_list);
3314
3315 if (ib_register_client(&mad_client)) {
3316 pr_err("Couldn't register ib_mad client\n");
3317 return -EINVAL;
3318 }
3319
3320 return 0;
3321 }
3322
ib_mad_cleanup(void)3323 void ib_mad_cleanup(void)
3324 {
3325 ib_unregister_client(&mad_client);
3326 }
3327