1 /*
2 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
5 * Copyright (c) 2009 HNR Consulting. All rights reserved.
6 * Copyright (c) 2014,2018 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 *
36 */
37
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40 #include <linux/dma-mapping.h>
41 #include <linux/slab.h>
42 #include <linux/module.h>
43 #include <linux/security.h>
44 #include <linux/xarray.h>
45 #include <rdma/ib_cache.h>
46
47 #include "mad_priv.h"
48 #include "core_priv.h"
49 #include "mad_rmpp.h"
50 #include "smi.h"
51 #include "opa_smi.h"
52 #include "agent.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ib_mad.h>
56
57 #ifdef CONFIG_TRACEPOINTS
create_mad_addr_info(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_qp_info * qp_info,struct trace_event_raw_ib_mad_send_template * entry)58 static void create_mad_addr_info(struct ib_mad_send_wr_private *mad_send_wr,
59 struct ib_mad_qp_info *qp_info,
60 struct trace_event_raw_ib_mad_send_template *entry)
61 {
62 u16 pkey;
63 struct ib_device *dev = qp_info->port_priv->device;
64 u8 pnum = qp_info->port_priv->port_num;
65 struct ib_ud_wr *wr = &mad_send_wr->send_wr;
66 struct rdma_ah_attr attr = {};
67
68 rdma_query_ah(wr->ah, &attr);
69
70 /* These are common */
71 entry->sl = attr.sl;
72 ib_query_pkey(dev, pnum, wr->pkey_index, &pkey);
73 entry->pkey = pkey;
74 entry->rqpn = wr->remote_qpn;
75 entry->rqkey = wr->remote_qkey;
76 entry->dlid = rdma_ah_get_dlid(&attr);
77 }
78 #endif
79
80 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
81 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
82
83 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
84 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
85 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
86 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
87
88 static DEFINE_XARRAY_ALLOC1(ib_mad_clients);
89 static u32 ib_mad_client_next;
90 static struct list_head ib_mad_port_list;
91
92 /* Port list lock */
93 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
94
95 /* Forward declarations */
96 static int method_in_use(struct ib_mad_mgmt_method_table **method,
97 struct ib_mad_reg_req *mad_reg_req);
98 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
99 static struct ib_mad_agent_private *find_mad_agent(
100 struct ib_mad_port_private *port_priv,
101 const struct ib_mad_hdr *mad);
102 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
103 struct ib_mad_private *mad);
104 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
105 static void timeout_sends(struct work_struct *work);
106 static void local_completions(struct work_struct *work);
107 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
108 struct ib_mad_agent_private *agent_priv,
109 u8 mgmt_class);
110 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
111 struct ib_mad_agent_private *agent_priv);
112 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
113 struct ib_wc *wc);
114 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
115
116 /*
117 * Returns a ib_mad_port_private structure or NULL for a device/port
118 * Assumes ib_mad_port_list_lock is being held
119 */
120 static inline struct ib_mad_port_private *
__ib_get_mad_port(struct ib_device * device,int port_num)121 __ib_get_mad_port(struct ib_device *device, int port_num)
122 {
123 struct ib_mad_port_private *entry;
124
125 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
126 if (entry->device == device && entry->port_num == port_num)
127 return entry;
128 }
129 return NULL;
130 }
131
132 /*
133 * Wrapper function to return a ib_mad_port_private structure or NULL
134 * for a device/port
135 */
136 static inline struct ib_mad_port_private *
ib_get_mad_port(struct ib_device * device,int port_num)137 ib_get_mad_port(struct ib_device *device, int port_num)
138 {
139 struct ib_mad_port_private *entry;
140 unsigned long flags;
141
142 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
143 entry = __ib_get_mad_port(device, port_num);
144 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
145
146 return entry;
147 }
148
convert_mgmt_class(u8 mgmt_class)149 static inline u8 convert_mgmt_class(u8 mgmt_class)
150 {
151 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
152 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
153 0 : mgmt_class;
154 }
155
get_spl_qp_index(enum ib_qp_type qp_type)156 static int get_spl_qp_index(enum ib_qp_type qp_type)
157 {
158 switch (qp_type)
159 {
160 case IB_QPT_SMI:
161 return 0;
162 case IB_QPT_GSI:
163 return 1;
164 default:
165 return -1;
166 }
167 }
168
vendor_class_index(u8 mgmt_class)169 static int vendor_class_index(u8 mgmt_class)
170 {
171 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
172 }
173
is_vendor_class(u8 mgmt_class)174 static int is_vendor_class(u8 mgmt_class)
175 {
176 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
177 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
178 return 0;
179 return 1;
180 }
181
is_vendor_oui(char * oui)182 static int is_vendor_oui(char *oui)
183 {
184 if (oui[0] || oui[1] || oui[2])
185 return 1;
186 return 0;
187 }
188
is_vendor_method_in_use(struct ib_mad_mgmt_vendor_class * vendor_class,struct ib_mad_reg_req * mad_reg_req)189 static int is_vendor_method_in_use(
190 struct ib_mad_mgmt_vendor_class *vendor_class,
191 struct ib_mad_reg_req *mad_reg_req)
192 {
193 struct ib_mad_mgmt_method_table *method;
194 int i;
195
196 for (i = 0; i < MAX_MGMT_OUI; i++) {
197 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
198 method = vendor_class->method_table[i];
199 if (method) {
200 if (method_in_use(&method, mad_reg_req))
201 return 1;
202 else
203 break;
204 }
205 }
206 }
207 return 0;
208 }
209
ib_response_mad(const struct ib_mad_hdr * hdr)210 int ib_response_mad(const struct ib_mad_hdr *hdr)
211 {
212 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
213 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
214 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
215 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
216 }
217 EXPORT_SYMBOL(ib_response_mad);
218
219 /*
220 * ib_register_mad_agent - Register to send/receive MADs
221 *
222 * Context: Process context.
223 */
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)224 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
225 u8 port_num,
226 enum ib_qp_type qp_type,
227 struct ib_mad_reg_req *mad_reg_req,
228 u8 rmpp_version,
229 ib_mad_send_handler send_handler,
230 ib_mad_recv_handler recv_handler,
231 void *context,
232 u32 registration_flags)
233 {
234 struct ib_mad_port_private *port_priv;
235 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
236 struct ib_mad_agent_private *mad_agent_priv;
237 struct ib_mad_reg_req *reg_req = NULL;
238 struct ib_mad_mgmt_class_table *class;
239 struct ib_mad_mgmt_vendor_class_table *vendor;
240 struct ib_mad_mgmt_vendor_class *vendor_class;
241 struct ib_mad_mgmt_method_table *method;
242 int ret2, qpn;
243 u8 mgmt_class, vclass;
244
245 if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
246 (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
247 return ERR_PTR(-EPROTONOSUPPORT);
248
249 /* Validate parameters */
250 qpn = get_spl_qp_index(qp_type);
251 if (qpn == -1) {
252 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
253 __func__, qp_type);
254 goto error1;
255 }
256
257 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
258 dev_dbg_ratelimited(&device->dev,
259 "%s: invalid RMPP Version %u\n",
260 __func__, rmpp_version);
261 goto error1;
262 }
263
264 /* Validate MAD registration request if supplied */
265 if (mad_reg_req) {
266 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
267 dev_dbg_ratelimited(&device->dev,
268 "%s: invalid Class Version %u\n",
269 __func__,
270 mad_reg_req->mgmt_class_version);
271 goto error1;
272 }
273 if (!recv_handler) {
274 dev_dbg_ratelimited(&device->dev,
275 "%s: no recv_handler\n", __func__);
276 goto error1;
277 }
278 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
279 /*
280 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
281 * one in this range currently allowed
282 */
283 if (mad_reg_req->mgmt_class !=
284 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
285 dev_dbg_ratelimited(&device->dev,
286 "%s: Invalid Mgmt Class 0x%x\n",
287 __func__, mad_reg_req->mgmt_class);
288 goto error1;
289 }
290 } else if (mad_reg_req->mgmt_class == 0) {
291 /*
292 * Class 0 is reserved in IBA and is used for
293 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
294 */
295 dev_dbg_ratelimited(&device->dev,
296 "%s: Invalid Mgmt Class 0\n",
297 __func__);
298 goto error1;
299 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
300 /*
301 * If class is in "new" vendor range,
302 * ensure supplied OUI is not zero
303 */
304 if (!is_vendor_oui(mad_reg_req->oui)) {
305 dev_dbg_ratelimited(&device->dev,
306 "%s: No OUI specified for class 0x%x\n",
307 __func__,
308 mad_reg_req->mgmt_class);
309 goto error1;
310 }
311 }
312 /* Make sure class supplied is consistent with RMPP */
313 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
314 if (rmpp_version) {
315 dev_dbg_ratelimited(&device->dev,
316 "%s: RMPP version for non-RMPP class 0x%x\n",
317 __func__, mad_reg_req->mgmt_class);
318 goto error1;
319 }
320 }
321
322 /* Make sure class supplied is consistent with QP type */
323 if (qp_type == IB_QPT_SMI) {
324 if ((mad_reg_req->mgmt_class !=
325 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
326 (mad_reg_req->mgmt_class !=
327 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
328 dev_dbg_ratelimited(&device->dev,
329 "%s: Invalid SM QP type: class 0x%x\n",
330 __func__, mad_reg_req->mgmt_class);
331 goto error1;
332 }
333 } else {
334 if ((mad_reg_req->mgmt_class ==
335 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
336 (mad_reg_req->mgmt_class ==
337 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
338 dev_dbg_ratelimited(&device->dev,
339 "%s: Invalid GS QP type: class 0x%x\n",
340 __func__, mad_reg_req->mgmt_class);
341 goto error1;
342 }
343 }
344 } else {
345 /* No registration request supplied */
346 if (!send_handler)
347 goto error1;
348 if (registration_flags & IB_MAD_USER_RMPP)
349 goto error1;
350 }
351
352 /* Validate device and port */
353 port_priv = ib_get_mad_port(device, port_num);
354 if (!port_priv) {
355 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %d\n",
356 __func__, port_num);
357 ret = ERR_PTR(-ENODEV);
358 goto error1;
359 }
360
361 /* Verify the QP requested is supported. For example, Ethernet devices
362 * will not have QP0.
363 */
364 if (!port_priv->qp_info[qpn].qp) {
365 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
366 __func__, qpn);
367 ret = ERR_PTR(-EPROTONOSUPPORT);
368 goto error1;
369 }
370
371 /* Allocate structures */
372 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
373 if (!mad_agent_priv) {
374 ret = ERR_PTR(-ENOMEM);
375 goto error1;
376 }
377
378 if (mad_reg_req) {
379 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
380 if (!reg_req) {
381 ret = ERR_PTR(-ENOMEM);
382 goto error3;
383 }
384 }
385
386 /* Now, fill in the various structures */
387 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
388 mad_agent_priv->reg_req = reg_req;
389 mad_agent_priv->agent.rmpp_version = rmpp_version;
390 mad_agent_priv->agent.device = device;
391 mad_agent_priv->agent.recv_handler = recv_handler;
392 mad_agent_priv->agent.send_handler = send_handler;
393 mad_agent_priv->agent.context = context;
394 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
395 mad_agent_priv->agent.port_num = port_num;
396 mad_agent_priv->agent.flags = registration_flags;
397 spin_lock_init(&mad_agent_priv->lock);
398 INIT_LIST_HEAD(&mad_agent_priv->send_list);
399 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
400 INIT_LIST_HEAD(&mad_agent_priv->done_list);
401 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
402 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
403 INIT_LIST_HEAD(&mad_agent_priv->local_list);
404 INIT_WORK(&mad_agent_priv->local_work, local_completions);
405 refcount_set(&mad_agent_priv->refcount, 1);
406 init_completion(&mad_agent_priv->comp);
407
408 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
409 if (ret2) {
410 ret = ERR_PTR(ret2);
411 goto error4;
412 }
413
414 /*
415 * The mlx4 driver uses the top byte to distinguish which virtual
416 * function generated the MAD, so we must avoid using it.
417 */
418 ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid,
419 mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1),
420 &ib_mad_client_next, GFP_KERNEL);
421 if (ret2 < 0) {
422 ret = ERR_PTR(ret2);
423 goto error5;
424 }
425
426 /*
427 * Make sure MAD registration (if supplied)
428 * is non overlapping with any existing ones
429 */
430 spin_lock_irq(&port_priv->reg_lock);
431 if (mad_reg_req) {
432 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
433 if (!is_vendor_class(mgmt_class)) {
434 class = port_priv->version[mad_reg_req->
435 mgmt_class_version].class;
436 if (class) {
437 method = class->method_table[mgmt_class];
438 if (method) {
439 if (method_in_use(&method,
440 mad_reg_req))
441 goto error6;
442 }
443 }
444 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
445 mgmt_class);
446 } else {
447 /* "New" vendor class range */
448 vendor = port_priv->version[mad_reg_req->
449 mgmt_class_version].vendor;
450 if (vendor) {
451 vclass = vendor_class_index(mgmt_class);
452 vendor_class = vendor->vendor_class[vclass];
453 if (vendor_class) {
454 if (is_vendor_method_in_use(
455 vendor_class,
456 mad_reg_req))
457 goto error6;
458 }
459 }
460 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
461 }
462 if (ret2) {
463 ret = ERR_PTR(ret2);
464 goto error6;
465 }
466 }
467 spin_unlock_irq(&port_priv->reg_lock);
468
469 trace_ib_mad_create_agent(mad_agent_priv);
470 return &mad_agent_priv->agent;
471 error6:
472 spin_unlock_irq(&port_priv->reg_lock);
473 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
474 error5:
475 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
476 error4:
477 kfree(reg_req);
478 error3:
479 kfree(mad_agent_priv);
480 error1:
481 return ret;
482 }
483 EXPORT_SYMBOL(ib_register_mad_agent);
484
deref_mad_agent(struct ib_mad_agent_private * mad_agent_priv)485 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
486 {
487 if (refcount_dec_and_test(&mad_agent_priv->refcount))
488 complete(&mad_agent_priv->comp);
489 }
490
unregister_mad_agent(struct ib_mad_agent_private * mad_agent_priv)491 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
492 {
493 struct ib_mad_port_private *port_priv;
494
495 /* Note that we could still be handling received MADs */
496 trace_ib_mad_unregister_agent(mad_agent_priv);
497
498 /*
499 * Canceling all sends results in dropping received response
500 * MADs, preventing us from queuing additional work
501 */
502 cancel_mads(mad_agent_priv);
503 port_priv = mad_agent_priv->qp_info->port_priv;
504 cancel_delayed_work(&mad_agent_priv->timed_work);
505
506 spin_lock_irq(&port_priv->reg_lock);
507 remove_mad_reg_req(mad_agent_priv);
508 spin_unlock_irq(&port_priv->reg_lock);
509 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
510
511 flush_workqueue(port_priv->wq);
512
513 deref_mad_agent(mad_agent_priv);
514 wait_for_completion(&mad_agent_priv->comp);
515 ib_cancel_rmpp_recvs(mad_agent_priv);
516
517 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
518
519 kfree(mad_agent_priv->reg_req);
520 kfree_rcu(mad_agent_priv, rcu);
521 }
522
523 /*
524 * ib_unregister_mad_agent - Unregisters a client from using MAD services
525 *
526 * Context: Process context.
527 */
ib_unregister_mad_agent(struct ib_mad_agent * mad_agent)528 void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
529 {
530 struct ib_mad_agent_private *mad_agent_priv;
531
532 mad_agent_priv = container_of(mad_agent,
533 struct ib_mad_agent_private,
534 agent);
535 unregister_mad_agent(mad_agent_priv);
536 }
537 EXPORT_SYMBOL(ib_unregister_mad_agent);
538
dequeue_mad(struct ib_mad_list_head * mad_list)539 static void dequeue_mad(struct ib_mad_list_head *mad_list)
540 {
541 struct ib_mad_queue *mad_queue;
542 unsigned long flags;
543
544 mad_queue = mad_list->mad_queue;
545 spin_lock_irqsave(&mad_queue->lock, flags);
546 list_del(&mad_list->list);
547 mad_queue->count--;
548 spin_unlock_irqrestore(&mad_queue->lock, flags);
549 }
550
build_smp_wc(struct ib_qp * qp,struct ib_cqe * cqe,u16 slid,u16 pkey_index,u8 port_num,struct ib_wc * wc)551 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
552 u16 pkey_index, u8 port_num, struct ib_wc *wc)
553 {
554 memset(wc, 0, sizeof *wc);
555 wc->wr_cqe = cqe;
556 wc->status = IB_WC_SUCCESS;
557 wc->opcode = IB_WC_RECV;
558 wc->pkey_index = pkey_index;
559 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
560 wc->src_qp = IB_QP0;
561 wc->qp = qp;
562 wc->slid = slid;
563 wc->sl = 0;
564 wc->dlid_path_bits = 0;
565 wc->port_num = port_num;
566 }
567
mad_priv_size(const struct ib_mad_private * mp)568 static size_t mad_priv_size(const struct ib_mad_private *mp)
569 {
570 return sizeof(struct ib_mad_private) + mp->mad_size;
571 }
572
alloc_mad_private(size_t mad_size,gfp_t flags)573 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
574 {
575 size_t size = sizeof(struct ib_mad_private) + mad_size;
576 struct ib_mad_private *ret = kzalloc(size, flags);
577
578 if (ret)
579 ret->mad_size = mad_size;
580
581 return ret;
582 }
583
port_mad_size(const struct ib_mad_port_private * port_priv)584 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
585 {
586 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
587 }
588
mad_priv_dma_size(const struct ib_mad_private * mp)589 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
590 {
591 return sizeof(struct ib_grh) + mp->mad_size;
592 }
593
594 /*
595 * Return 0 if SMP is to be sent
596 * Return 1 if SMP was consumed locally (whether or not solicited)
597 * Return < 0 if error
598 */
handle_outgoing_dr_smp(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_send_wr_private * mad_send_wr)599 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
600 struct ib_mad_send_wr_private *mad_send_wr)
601 {
602 int ret = 0;
603 struct ib_smp *smp = mad_send_wr->send_buf.mad;
604 struct opa_smp *opa_smp = (struct opa_smp *)smp;
605 unsigned long flags;
606 struct ib_mad_local_private *local;
607 struct ib_mad_private *mad_priv;
608 struct ib_mad_port_private *port_priv;
609 struct ib_mad_agent_private *recv_mad_agent = NULL;
610 struct ib_device *device = mad_agent_priv->agent.device;
611 u8 port_num;
612 struct ib_wc mad_wc;
613 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
614 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
615 u16 out_mad_pkey_index = 0;
616 u16 drslid;
617 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
618 mad_agent_priv->qp_info->port_priv->port_num);
619
620 if (rdma_cap_ib_switch(device) &&
621 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
622 port_num = send_wr->port_num;
623 else
624 port_num = mad_agent_priv->agent.port_num;
625
626 /*
627 * Directed route handling starts if the initial LID routed part of
628 * a request or the ending LID routed part of a response is empty.
629 * If we are at the start of the LID routed part, don't update the
630 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
631 */
632 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
633 u32 opa_drslid;
634
635 trace_ib_mad_handle_out_opa_smi(opa_smp);
636
637 if ((opa_get_smp_direction(opa_smp)
638 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
639 OPA_LID_PERMISSIVE &&
640 opa_smi_handle_dr_smp_send(opa_smp,
641 rdma_cap_ib_switch(device),
642 port_num) == IB_SMI_DISCARD) {
643 ret = -EINVAL;
644 dev_err(&device->dev, "OPA Invalid directed route\n");
645 goto out;
646 }
647 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
648 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
649 opa_drslid & 0xffff0000) {
650 ret = -EINVAL;
651 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
652 opa_drslid);
653 goto out;
654 }
655 drslid = (u16)(opa_drslid & 0x0000ffff);
656
657 /* Check to post send on QP or process locally */
658 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
659 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
660 goto out;
661 } else {
662 trace_ib_mad_handle_out_ib_smi(smp);
663
664 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
665 IB_LID_PERMISSIVE &&
666 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
667 IB_SMI_DISCARD) {
668 ret = -EINVAL;
669 dev_err(&device->dev, "Invalid directed route\n");
670 goto out;
671 }
672 drslid = be16_to_cpu(smp->dr_slid);
673
674 /* Check to post send on QP or process locally */
675 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
676 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
677 goto out;
678 }
679
680 local = kmalloc(sizeof *local, GFP_ATOMIC);
681 if (!local) {
682 ret = -ENOMEM;
683 goto out;
684 }
685 local->mad_priv = NULL;
686 local->recv_mad_agent = NULL;
687 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
688 if (!mad_priv) {
689 ret = -ENOMEM;
690 kfree(local);
691 goto out;
692 }
693
694 build_smp_wc(mad_agent_priv->agent.qp,
695 send_wr->wr.wr_cqe, drslid,
696 send_wr->pkey_index,
697 send_wr->port_num, &mad_wc);
698
699 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
700 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
701 + mad_send_wr->send_buf.data_len
702 + sizeof(struct ib_grh);
703 }
704
705 /* No GRH for DR SMP */
706 ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL,
707 (const struct ib_mad *)smp,
708 (struct ib_mad *)mad_priv->mad, &mad_size,
709 &out_mad_pkey_index);
710 switch (ret)
711 {
712 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
713 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
714 mad_agent_priv->agent.recv_handler) {
715 local->mad_priv = mad_priv;
716 local->recv_mad_agent = mad_agent_priv;
717 /*
718 * Reference MAD agent until receive
719 * side of local completion handled
720 */
721 refcount_inc(&mad_agent_priv->refcount);
722 } else
723 kfree(mad_priv);
724 break;
725 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
726 kfree(mad_priv);
727 break;
728 case IB_MAD_RESULT_SUCCESS:
729 /* Treat like an incoming receive MAD */
730 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
731 mad_agent_priv->agent.port_num);
732 if (port_priv) {
733 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
734 recv_mad_agent = find_mad_agent(port_priv,
735 (const struct ib_mad_hdr *)mad_priv->mad);
736 }
737 if (!port_priv || !recv_mad_agent) {
738 /*
739 * No receiving agent so drop packet and
740 * generate send completion.
741 */
742 kfree(mad_priv);
743 break;
744 }
745 local->mad_priv = mad_priv;
746 local->recv_mad_agent = recv_mad_agent;
747 break;
748 default:
749 kfree(mad_priv);
750 kfree(local);
751 ret = -EINVAL;
752 goto out;
753 }
754
755 local->mad_send_wr = mad_send_wr;
756 if (opa) {
757 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
758 local->return_wc_byte_len = mad_size;
759 }
760 /* Reference MAD agent until send side of local completion handled */
761 refcount_inc(&mad_agent_priv->refcount);
762 /* Queue local completion to local list */
763 spin_lock_irqsave(&mad_agent_priv->lock, flags);
764 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
765 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
766 queue_work(mad_agent_priv->qp_info->port_priv->wq,
767 &mad_agent_priv->local_work);
768 ret = 1;
769 out:
770 return ret;
771 }
772
get_pad_size(int hdr_len,int data_len,size_t mad_size)773 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
774 {
775 int seg_size, pad;
776
777 seg_size = mad_size - hdr_len;
778 if (data_len && seg_size) {
779 pad = seg_size - data_len % seg_size;
780 return pad == seg_size ? 0 : pad;
781 } else
782 return seg_size;
783 }
784
free_send_rmpp_list(struct ib_mad_send_wr_private * mad_send_wr)785 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
786 {
787 struct ib_rmpp_segment *s, *t;
788
789 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
790 list_del(&s->list);
791 kfree(s);
792 }
793 }
794
alloc_send_rmpp_list(struct ib_mad_send_wr_private * send_wr,size_t mad_size,gfp_t gfp_mask)795 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
796 size_t mad_size, gfp_t gfp_mask)
797 {
798 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
799 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
800 struct ib_rmpp_segment *seg = NULL;
801 int left, seg_size, pad;
802
803 send_buf->seg_size = mad_size - send_buf->hdr_len;
804 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
805 seg_size = send_buf->seg_size;
806 pad = send_wr->pad;
807
808 /* Allocate data segments. */
809 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
810 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
811 if (!seg) {
812 free_send_rmpp_list(send_wr);
813 return -ENOMEM;
814 }
815 seg->num = ++send_buf->seg_count;
816 list_add_tail(&seg->list, &send_wr->rmpp_list);
817 }
818
819 /* Zero any padding */
820 if (pad)
821 memset(seg->data + seg_size - pad, 0, pad);
822
823 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
824 agent.rmpp_version;
825 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
826 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
827
828 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
829 struct ib_rmpp_segment, list);
830 send_wr->last_ack_seg = send_wr->cur_seg;
831 return 0;
832 }
833
ib_mad_kernel_rmpp_agent(const struct ib_mad_agent * agent)834 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
835 {
836 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
837 }
838 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
839
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)840 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
841 u32 remote_qpn, u16 pkey_index,
842 int rmpp_active,
843 int hdr_len, int data_len,
844 gfp_t gfp_mask,
845 u8 base_version)
846 {
847 struct ib_mad_agent_private *mad_agent_priv;
848 struct ib_mad_send_wr_private *mad_send_wr;
849 int pad, message_size, ret, size;
850 void *buf;
851 size_t mad_size;
852 bool opa;
853
854 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
855 agent);
856
857 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
858
859 if (opa && base_version == OPA_MGMT_BASE_VERSION)
860 mad_size = sizeof(struct opa_mad);
861 else
862 mad_size = sizeof(struct ib_mad);
863
864 pad = get_pad_size(hdr_len, data_len, mad_size);
865 message_size = hdr_len + data_len + pad;
866
867 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
868 if (!rmpp_active && message_size > mad_size)
869 return ERR_PTR(-EINVAL);
870 } else
871 if (rmpp_active || message_size > mad_size)
872 return ERR_PTR(-EINVAL);
873
874 size = rmpp_active ? hdr_len : mad_size;
875 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
876 if (!buf)
877 return ERR_PTR(-ENOMEM);
878
879 mad_send_wr = buf + size;
880 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
881 mad_send_wr->send_buf.mad = buf;
882 mad_send_wr->send_buf.hdr_len = hdr_len;
883 mad_send_wr->send_buf.data_len = data_len;
884 mad_send_wr->pad = pad;
885
886 mad_send_wr->mad_agent_priv = mad_agent_priv;
887 mad_send_wr->sg_list[0].length = hdr_len;
888 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
889
890 /* OPA MADs don't have to be the full 2048 bytes */
891 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
892 data_len < mad_size - hdr_len)
893 mad_send_wr->sg_list[1].length = data_len;
894 else
895 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
896
897 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
898
899 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
900
901 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
902 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
903 mad_send_wr->send_wr.wr.num_sge = 2;
904 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
905 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
906 mad_send_wr->send_wr.remote_qpn = remote_qpn;
907 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
908 mad_send_wr->send_wr.pkey_index = pkey_index;
909
910 if (rmpp_active) {
911 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
912 if (ret) {
913 kfree(buf);
914 return ERR_PTR(ret);
915 }
916 }
917
918 mad_send_wr->send_buf.mad_agent = mad_agent;
919 refcount_inc(&mad_agent_priv->refcount);
920 return &mad_send_wr->send_buf;
921 }
922 EXPORT_SYMBOL(ib_create_send_mad);
923
ib_get_mad_data_offset(u8 mgmt_class)924 int ib_get_mad_data_offset(u8 mgmt_class)
925 {
926 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
927 return IB_MGMT_SA_HDR;
928 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
929 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
930 (mgmt_class == IB_MGMT_CLASS_BIS))
931 return IB_MGMT_DEVICE_HDR;
932 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
933 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
934 return IB_MGMT_VENDOR_HDR;
935 else
936 return IB_MGMT_MAD_HDR;
937 }
938 EXPORT_SYMBOL(ib_get_mad_data_offset);
939
ib_is_mad_class_rmpp(u8 mgmt_class)940 int ib_is_mad_class_rmpp(u8 mgmt_class)
941 {
942 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
943 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
944 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
945 (mgmt_class == IB_MGMT_CLASS_BIS) ||
946 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
947 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
948 return 1;
949 return 0;
950 }
951 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
952
ib_get_rmpp_segment(struct ib_mad_send_buf * send_buf,int seg_num)953 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
954 {
955 struct ib_mad_send_wr_private *mad_send_wr;
956 struct list_head *list;
957
958 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
959 send_buf);
960 list = &mad_send_wr->cur_seg->list;
961
962 if (mad_send_wr->cur_seg->num < seg_num) {
963 list_for_each_entry(mad_send_wr->cur_seg, list, list)
964 if (mad_send_wr->cur_seg->num == seg_num)
965 break;
966 } else if (mad_send_wr->cur_seg->num > seg_num) {
967 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
968 if (mad_send_wr->cur_seg->num == seg_num)
969 break;
970 }
971 return mad_send_wr->cur_seg->data;
972 }
973 EXPORT_SYMBOL(ib_get_rmpp_segment);
974
ib_get_payload(struct ib_mad_send_wr_private * mad_send_wr)975 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
976 {
977 if (mad_send_wr->send_buf.seg_count)
978 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
979 mad_send_wr->seg_num);
980 else
981 return mad_send_wr->send_buf.mad +
982 mad_send_wr->send_buf.hdr_len;
983 }
984
ib_free_send_mad(struct ib_mad_send_buf * send_buf)985 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
986 {
987 struct ib_mad_agent_private *mad_agent_priv;
988 struct ib_mad_send_wr_private *mad_send_wr;
989
990 mad_agent_priv = container_of(send_buf->mad_agent,
991 struct ib_mad_agent_private, agent);
992 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
993 send_buf);
994
995 free_send_rmpp_list(mad_send_wr);
996 kfree(send_buf->mad);
997 deref_mad_agent(mad_agent_priv);
998 }
999 EXPORT_SYMBOL(ib_free_send_mad);
1000
ib_send_mad(struct ib_mad_send_wr_private * mad_send_wr)1001 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1002 {
1003 struct ib_mad_qp_info *qp_info;
1004 struct list_head *list;
1005 struct ib_mad_agent *mad_agent;
1006 struct ib_sge *sge;
1007 unsigned long flags;
1008 int ret;
1009
1010 /* Set WR ID to find mad_send_wr upon completion */
1011 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1012 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1013 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1014 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1015
1016 mad_agent = mad_send_wr->send_buf.mad_agent;
1017 sge = mad_send_wr->sg_list;
1018 sge[0].addr = ib_dma_map_single(mad_agent->device,
1019 mad_send_wr->send_buf.mad,
1020 sge[0].length,
1021 DMA_TO_DEVICE);
1022 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1023 return -ENOMEM;
1024
1025 mad_send_wr->header_mapping = sge[0].addr;
1026
1027 sge[1].addr = ib_dma_map_single(mad_agent->device,
1028 ib_get_payload(mad_send_wr),
1029 sge[1].length,
1030 DMA_TO_DEVICE);
1031 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1032 ib_dma_unmap_single(mad_agent->device,
1033 mad_send_wr->header_mapping,
1034 sge[0].length, DMA_TO_DEVICE);
1035 return -ENOMEM;
1036 }
1037 mad_send_wr->payload_mapping = sge[1].addr;
1038
1039 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1040 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1041 trace_ib_mad_ib_send_mad(mad_send_wr, qp_info);
1042 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1043 NULL);
1044 list = &qp_info->send_queue.list;
1045 } else {
1046 ret = 0;
1047 list = &qp_info->overflow_list;
1048 }
1049
1050 if (!ret) {
1051 qp_info->send_queue.count++;
1052 list_add_tail(&mad_send_wr->mad_list.list, list);
1053 }
1054 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1055 if (ret) {
1056 ib_dma_unmap_single(mad_agent->device,
1057 mad_send_wr->header_mapping,
1058 sge[0].length, DMA_TO_DEVICE);
1059 ib_dma_unmap_single(mad_agent->device,
1060 mad_send_wr->payload_mapping,
1061 sge[1].length, DMA_TO_DEVICE);
1062 }
1063 return ret;
1064 }
1065
1066 /*
1067 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1068 * with the registered client
1069 */
ib_post_send_mad(struct ib_mad_send_buf * send_buf,struct ib_mad_send_buf ** bad_send_buf)1070 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1071 struct ib_mad_send_buf **bad_send_buf)
1072 {
1073 struct ib_mad_agent_private *mad_agent_priv;
1074 struct ib_mad_send_buf *next_send_buf;
1075 struct ib_mad_send_wr_private *mad_send_wr;
1076 unsigned long flags;
1077 int ret = -EINVAL;
1078
1079 /* Walk list of send WRs and post each on send list */
1080 for (; send_buf; send_buf = next_send_buf) {
1081 mad_send_wr = container_of(send_buf,
1082 struct ib_mad_send_wr_private,
1083 send_buf);
1084 mad_agent_priv = mad_send_wr->mad_agent_priv;
1085
1086 ret = ib_mad_enforce_security(mad_agent_priv,
1087 mad_send_wr->send_wr.pkey_index);
1088 if (ret)
1089 goto error;
1090
1091 if (!send_buf->mad_agent->send_handler ||
1092 (send_buf->timeout_ms &&
1093 !send_buf->mad_agent->recv_handler)) {
1094 ret = -EINVAL;
1095 goto error;
1096 }
1097
1098 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1099 if (mad_agent_priv->agent.rmpp_version) {
1100 ret = -EINVAL;
1101 goto error;
1102 }
1103 }
1104
1105 /*
1106 * Save pointer to next work request to post in case the
1107 * current one completes, and the user modifies the work
1108 * request associated with the completion
1109 */
1110 next_send_buf = send_buf->next;
1111 mad_send_wr->send_wr.ah = send_buf->ah;
1112
1113 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1114 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1115 ret = handle_outgoing_dr_smp(mad_agent_priv,
1116 mad_send_wr);
1117 if (ret < 0) /* error */
1118 goto error;
1119 else if (ret == 1) /* locally consumed */
1120 continue;
1121 }
1122
1123 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1124 /* Timeout will be updated after send completes */
1125 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1126 mad_send_wr->max_retries = send_buf->retries;
1127 mad_send_wr->retries_left = send_buf->retries;
1128 send_buf->retries = 0;
1129 /* Reference for work request to QP + response */
1130 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1131 mad_send_wr->status = IB_WC_SUCCESS;
1132
1133 /* Reference MAD agent until send completes */
1134 refcount_inc(&mad_agent_priv->refcount);
1135 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1136 list_add_tail(&mad_send_wr->agent_list,
1137 &mad_agent_priv->send_list);
1138 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1139
1140 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1141 ret = ib_send_rmpp_mad(mad_send_wr);
1142 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1143 ret = ib_send_mad(mad_send_wr);
1144 } else
1145 ret = ib_send_mad(mad_send_wr);
1146 if (ret < 0) {
1147 /* Fail send request */
1148 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1149 list_del(&mad_send_wr->agent_list);
1150 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1151 deref_mad_agent(mad_agent_priv);
1152 goto error;
1153 }
1154 }
1155 return 0;
1156 error:
1157 if (bad_send_buf)
1158 *bad_send_buf = send_buf;
1159 return ret;
1160 }
1161 EXPORT_SYMBOL(ib_post_send_mad);
1162
1163 /*
1164 * ib_free_recv_mad - Returns data buffers used to receive
1165 * a MAD to the access layer
1166 */
ib_free_recv_mad(struct ib_mad_recv_wc * mad_recv_wc)1167 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1168 {
1169 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1170 struct ib_mad_private_header *mad_priv_hdr;
1171 struct ib_mad_private *priv;
1172 struct list_head free_list;
1173
1174 INIT_LIST_HEAD(&free_list);
1175 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1176
1177 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1178 &free_list, list) {
1179 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1180 recv_buf);
1181 mad_priv_hdr = container_of(mad_recv_wc,
1182 struct ib_mad_private_header,
1183 recv_wc);
1184 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1185 header);
1186 kfree(priv);
1187 }
1188 }
1189 EXPORT_SYMBOL(ib_free_recv_mad);
1190
method_in_use(struct ib_mad_mgmt_method_table ** method,struct ib_mad_reg_req * mad_reg_req)1191 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1192 struct ib_mad_reg_req *mad_reg_req)
1193 {
1194 int i;
1195
1196 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1197 if ((*method)->agent[i]) {
1198 pr_err("Method %d already in use\n", i);
1199 return -EINVAL;
1200 }
1201 }
1202 return 0;
1203 }
1204
allocate_method_table(struct ib_mad_mgmt_method_table ** method)1205 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1206 {
1207 /* Allocate management method table */
1208 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1209 return (*method) ? 0 : (-ENOMEM);
1210 }
1211
1212 /*
1213 * Check to see if there are any methods still in use
1214 */
check_method_table(struct ib_mad_mgmt_method_table * method)1215 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1216 {
1217 int i;
1218
1219 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1220 if (method->agent[i])
1221 return 1;
1222 return 0;
1223 }
1224
1225 /*
1226 * Check to see if there are any method tables for this class still in use
1227 */
check_class_table(struct ib_mad_mgmt_class_table * class)1228 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1229 {
1230 int i;
1231
1232 for (i = 0; i < MAX_MGMT_CLASS; i++)
1233 if (class->method_table[i])
1234 return 1;
1235 return 0;
1236 }
1237
check_vendor_class(struct ib_mad_mgmt_vendor_class * vendor_class)1238 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1239 {
1240 int i;
1241
1242 for (i = 0; i < MAX_MGMT_OUI; i++)
1243 if (vendor_class->method_table[i])
1244 return 1;
1245 return 0;
1246 }
1247
find_vendor_oui(struct ib_mad_mgmt_vendor_class * vendor_class,const char * oui)1248 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1249 const char *oui)
1250 {
1251 int i;
1252
1253 for (i = 0; i < MAX_MGMT_OUI; i++)
1254 /* Is there matching OUI for this vendor class ? */
1255 if (!memcmp(vendor_class->oui[i], oui, 3))
1256 return i;
1257
1258 return -1;
1259 }
1260
check_vendor_table(struct ib_mad_mgmt_vendor_class_table * vendor)1261 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1262 {
1263 int i;
1264
1265 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1266 if (vendor->vendor_class[i])
1267 return 1;
1268
1269 return 0;
1270 }
1271
remove_methods_mad_agent(struct ib_mad_mgmt_method_table * method,struct ib_mad_agent_private * agent)1272 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1273 struct ib_mad_agent_private *agent)
1274 {
1275 int i;
1276
1277 /* Remove any methods for this mad agent */
1278 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1279 if (method->agent[i] == agent) {
1280 method->agent[i] = NULL;
1281 }
1282 }
1283 }
1284
add_nonoui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv,u8 mgmt_class)1285 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1286 struct ib_mad_agent_private *agent_priv,
1287 u8 mgmt_class)
1288 {
1289 struct ib_mad_port_private *port_priv;
1290 struct ib_mad_mgmt_class_table **class;
1291 struct ib_mad_mgmt_method_table **method;
1292 int i, ret;
1293
1294 port_priv = agent_priv->qp_info->port_priv;
1295 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1296 if (!*class) {
1297 /* Allocate management class table for "new" class version */
1298 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1299 if (!*class) {
1300 ret = -ENOMEM;
1301 goto error1;
1302 }
1303
1304 /* Allocate method table for this management class */
1305 method = &(*class)->method_table[mgmt_class];
1306 if ((ret = allocate_method_table(method)))
1307 goto error2;
1308 } else {
1309 method = &(*class)->method_table[mgmt_class];
1310 if (!*method) {
1311 /* Allocate method table for this management class */
1312 if ((ret = allocate_method_table(method)))
1313 goto error1;
1314 }
1315 }
1316
1317 /* Now, make sure methods are not already in use */
1318 if (method_in_use(method, mad_reg_req))
1319 goto error3;
1320
1321 /* Finally, add in methods being registered */
1322 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1323 (*method)->agent[i] = agent_priv;
1324
1325 return 0;
1326
1327 error3:
1328 /* Remove any methods for this mad agent */
1329 remove_methods_mad_agent(*method, agent_priv);
1330 /* Now, check to see if there are any methods in use */
1331 if (!check_method_table(*method)) {
1332 /* If not, release management method table */
1333 kfree(*method);
1334 *method = NULL;
1335 }
1336 ret = -EINVAL;
1337 goto error1;
1338 error2:
1339 kfree(*class);
1340 *class = NULL;
1341 error1:
1342 return ret;
1343 }
1344
add_oui_reg_req(struct ib_mad_reg_req * mad_reg_req,struct ib_mad_agent_private * agent_priv)1345 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1346 struct ib_mad_agent_private *agent_priv)
1347 {
1348 struct ib_mad_port_private *port_priv;
1349 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1350 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1351 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1352 struct ib_mad_mgmt_method_table **method;
1353 int i, ret = -ENOMEM;
1354 u8 vclass;
1355
1356 /* "New" vendor (with OUI) class */
1357 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1358 port_priv = agent_priv->qp_info->port_priv;
1359 vendor_table = &port_priv->version[
1360 mad_reg_req->mgmt_class_version].vendor;
1361 if (!*vendor_table) {
1362 /* Allocate mgmt vendor class table for "new" class version */
1363 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1364 if (!vendor)
1365 goto error1;
1366
1367 *vendor_table = vendor;
1368 }
1369 if (!(*vendor_table)->vendor_class[vclass]) {
1370 /* Allocate table for this management vendor class */
1371 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1372 if (!vendor_class)
1373 goto error2;
1374
1375 (*vendor_table)->vendor_class[vclass] = vendor_class;
1376 }
1377 for (i = 0; i < MAX_MGMT_OUI; i++) {
1378 /* Is there matching OUI for this vendor class ? */
1379 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1380 mad_reg_req->oui, 3)) {
1381 method = &(*vendor_table)->vendor_class[
1382 vclass]->method_table[i];
1383 if (!*method)
1384 goto error3;
1385 goto check_in_use;
1386 }
1387 }
1388 for (i = 0; i < MAX_MGMT_OUI; i++) {
1389 /* OUI slot available ? */
1390 if (!is_vendor_oui((*vendor_table)->vendor_class[
1391 vclass]->oui[i])) {
1392 method = &(*vendor_table)->vendor_class[
1393 vclass]->method_table[i];
1394 /* Allocate method table for this OUI */
1395 if (!*method) {
1396 ret = allocate_method_table(method);
1397 if (ret)
1398 goto error3;
1399 }
1400 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1401 mad_reg_req->oui, 3);
1402 goto check_in_use;
1403 }
1404 }
1405 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1406 goto error3;
1407
1408 check_in_use:
1409 /* Now, make sure methods are not already in use */
1410 if (method_in_use(method, mad_reg_req))
1411 goto error4;
1412
1413 /* Finally, add in methods being registered */
1414 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1415 (*method)->agent[i] = agent_priv;
1416
1417 return 0;
1418
1419 error4:
1420 /* Remove any methods for this mad agent */
1421 remove_methods_mad_agent(*method, agent_priv);
1422 /* Now, check to see if there are any methods in use */
1423 if (!check_method_table(*method)) {
1424 /* If not, release management method table */
1425 kfree(*method);
1426 *method = NULL;
1427 }
1428 ret = -EINVAL;
1429 error3:
1430 if (vendor_class) {
1431 (*vendor_table)->vendor_class[vclass] = NULL;
1432 kfree(vendor_class);
1433 }
1434 error2:
1435 if (vendor) {
1436 *vendor_table = NULL;
1437 kfree(vendor);
1438 }
1439 error1:
1440 return ret;
1441 }
1442
remove_mad_reg_req(struct ib_mad_agent_private * agent_priv)1443 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1444 {
1445 struct ib_mad_port_private *port_priv;
1446 struct ib_mad_mgmt_class_table *class;
1447 struct ib_mad_mgmt_method_table *method;
1448 struct ib_mad_mgmt_vendor_class_table *vendor;
1449 struct ib_mad_mgmt_vendor_class *vendor_class;
1450 int index;
1451 u8 mgmt_class;
1452
1453 /*
1454 * Was MAD registration request supplied
1455 * with original registration ?
1456 */
1457 if (!agent_priv->reg_req) {
1458 goto out;
1459 }
1460
1461 port_priv = agent_priv->qp_info->port_priv;
1462 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1463 class = port_priv->version[
1464 agent_priv->reg_req->mgmt_class_version].class;
1465 if (!class)
1466 goto vendor_check;
1467
1468 method = class->method_table[mgmt_class];
1469 if (method) {
1470 /* Remove any methods for this mad agent */
1471 remove_methods_mad_agent(method, agent_priv);
1472 /* Now, check to see if there are any methods still in use */
1473 if (!check_method_table(method)) {
1474 /* If not, release management method table */
1475 kfree(method);
1476 class->method_table[mgmt_class] = NULL;
1477 /* Any management classes left ? */
1478 if (!check_class_table(class)) {
1479 /* If not, release management class table */
1480 kfree(class);
1481 port_priv->version[
1482 agent_priv->reg_req->
1483 mgmt_class_version].class = NULL;
1484 }
1485 }
1486 }
1487
1488 vendor_check:
1489 if (!is_vendor_class(mgmt_class))
1490 goto out;
1491
1492 /* normalize mgmt_class to vendor range 2 */
1493 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1494 vendor = port_priv->version[
1495 agent_priv->reg_req->mgmt_class_version].vendor;
1496
1497 if (!vendor)
1498 goto out;
1499
1500 vendor_class = vendor->vendor_class[mgmt_class];
1501 if (vendor_class) {
1502 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1503 if (index < 0)
1504 goto out;
1505 method = vendor_class->method_table[index];
1506 if (method) {
1507 /* Remove any methods for this mad agent */
1508 remove_methods_mad_agent(method, agent_priv);
1509 /*
1510 * Now, check to see if there are
1511 * any methods still in use
1512 */
1513 if (!check_method_table(method)) {
1514 /* If not, release management method table */
1515 kfree(method);
1516 vendor_class->method_table[index] = NULL;
1517 memset(vendor_class->oui[index], 0, 3);
1518 /* Any OUIs left ? */
1519 if (!check_vendor_class(vendor_class)) {
1520 /* If not, release vendor class table */
1521 kfree(vendor_class);
1522 vendor->vendor_class[mgmt_class] = NULL;
1523 /* Any other vendor classes left ? */
1524 if (!check_vendor_table(vendor)) {
1525 kfree(vendor);
1526 port_priv->version[
1527 agent_priv->reg_req->
1528 mgmt_class_version].
1529 vendor = NULL;
1530 }
1531 }
1532 }
1533 }
1534 }
1535
1536 out:
1537 return;
1538 }
1539
1540 static struct ib_mad_agent_private *
find_mad_agent(struct ib_mad_port_private * port_priv,const struct ib_mad_hdr * mad_hdr)1541 find_mad_agent(struct ib_mad_port_private *port_priv,
1542 const struct ib_mad_hdr *mad_hdr)
1543 {
1544 struct ib_mad_agent_private *mad_agent = NULL;
1545 unsigned long flags;
1546
1547 if (ib_response_mad(mad_hdr)) {
1548 u32 hi_tid;
1549
1550 /*
1551 * Routing is based on high 32 bits of transaction ID
1552 * of MAD.
1553 */
1554 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1555 rcu_read_lock();
1556 mad_agent = xa_load(&ib_mad_clients, hi_tid);
1557 if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount))
1558 mad_agent = NULL;
1559 rcu_read_unlock();
1560 } else {
1561 struct ib_mad_mgmt_class_table *class;
1562 struct ib_mad_mgmt_method_table *method;
1563 struct ib_mad_mgmt_vendor_class_table *vendor;
1564 struct ib_mad_mgmt_vendor_class *vendor_class;
1565 const struct ib_vendor_mad *vendor_mad;
1566 int index;
1567
1568 spin_lock_irqsave(&port_priv->reg_lock, flags);
1569 /*
1570 * Routing is based on version, class, and method
1571 * For "newer" vendor MADs, also based on OUI
1572 */
1573 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1574 goto out;
1575 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1576 class = port_priv->version[
1577 mad_hdr->class_version].class;
1578 if (!class)
1579 goto out;
1580 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1581 ARRAY_SIZE(class->method_table))
1582 goto out;
1583 method = class->method_table[convert_mgmt_class(
1584 mad_hdr->mgmt_class)];
1585 if (method)
1586 mad_agent = method->agent[mad_hdr->method &
1587 ~IB_MGMT_METHOD_RESP];
1588 } else {
1589 vendor = port_priv->version[
1590 mad_hdr->class_version].vendor;
1591 if (!vendor)
1592 goto out;
1593 vendor_class = vendor->vendor_class[vendor_class_index(
1594 mad_hdr->mgmt_class)];
1595 if (!vendor_class)
1596 goto out;
1597 /* Find matching OUI */
1598 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1599 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1600 if (index == -1)
1601 goto out;
1602 method = vendor_class->method_table[index];
1603 if (method) {
1604 mad_agent = method->agent[mad_hdr->method &
1605 ~IB_MGMT_METHOD_RESP];
1606 }
1607 }
1608 if (mad_agent)
1609 refcount_inc(&mad_agent->refcount);
1610 out:
1611 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1612 }
1613
1614 if (mad_agent && !mad_agent->agent.recv_handler) {
1615 dev_notice(&port_priv->device->dev,
1616 "No receive handler for client %p on port %d\n",
1617 &mad_agent->agent, port_priv->port_num);
1618 deref_mad_agent(mad_agent);
1619 mad_agent = NULL;
1620 }
1621
1622 return mad_agent;
1623 }
1624
validate_mad(const struct ib_mad_hdr * mad_hdr,const struct ib_mad_qp_info * qp_info,bool opa)1625 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1626 const struct ib_mad_qp_info *qp_info,
1627 bool opa)
1628 {
1629 int valid = 0;
1630 u32 qp_num = qp_info->qp->qp_num;
1631
1632 /* Make sure MAD base version is understood */
1633 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1634 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1635 pr_err("MAD received with unsupported base version %d %s\n",
1636 mad_hdr->base_version, opa ? "(opa)" : "");
1637 goto out;
1638 }
1639
1640 /* Filter SMI packets sent to other than QP0 */
1641 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1642 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1643 if (qp_num == 0)
1644 valid = 1;
1645 } else {
1646 /* CM attributes other than ClassPortInfo only use Send method */
1647 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1648 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1649 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1650 goto out;
1651 /* Filter GSI packets sent to QP0 */
1652 if (qp_num != 0)
1653 valid = 1;
1654 }
1655
1656 out:
1657 return valid;
1658 }
1659
is_rmpp_data_mad(const struct ib_mad_agent_private * mad_agent_priv,const struct ib_mad_hdr * mad_hdr)1660 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1661 const struct ib_mad_hdr *mad_hdr)
1662 {
1663 struct ib_rmpp_mad *rmpp_mad;
1664
1665 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1666 return !mad_agent_priv->agent.rmpp_version ||
1667 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1668 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1669 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1670 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1671 }
1672
rcv_has_same_class(const struct ib_mad_send_wr_private * wr,const struct ib_mad_recv_wc * rwc)1673 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1674 const struct ib_mad_recv_wc *rwc)
1675 {
1676 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1677 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1678 }
1679
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)1680 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1681 const struct ib_mad_send_wr_private *wr,
1682 const struct ib_mad_recv_wc *rwc )
1683 {
1684 struct rdma_ah_attr attr;
1685 u8 send_resp, rcv_resp;
1686 union ib_gid sgid;
1687 struct ib_device *device = mad_agent_priv->agent.device;
1688 u8 port_num = mad_agent_priv->agent.port_num;
1689 u8 lmc;
1690 bool has_grh;
1691
1692 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1693 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1694
1695 if (send_resp == rcv_resp)
1696 /* both requests, or both responses. GIDs different */
1697 return 0;
1698
1699 if (rdma_query_ah(wr->send_buf.ah, &attr))
1700 /* Assume not equal, to avoid false positives. */
1701 return 0;
1702
1703 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1704 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1705 /* one has GID, other does not. Assume different */
1706 return 0;
1707
1708 if (!send_resp && rcv_resp) {
1709 /* is request/response. */
1710 if (!has_grh) {
1711 if (ib_get_cached_lmc(device, port_num, &lmc))
1712 return 0;
1713 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1714 rwc->wc->dlid_path_bits) &
1715 ((1 << lmc) - 1)));
1716 } else {
1717 const struct ib_global_route *grh =
1718 rdma_ah_read_grh(&attr);
1719
1720 if (rdma_query_gid(device, port_num,
1721 grh->sgid_index, &sgid))
1722 return 0;
1723 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1724 16);
1725 }
1726 }
1727
1728 if (!has_grh)
1729 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1730 else
1731 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1732 rwc->recv_buf.grh->sgid.raw,
1733 16);
1734 }
1735
is_direct(u8 class)1736 static inline int is_direct(u8 class)
1737 {
1738 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1739 }
1740
1741 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)1742 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1743 const struct ib_mad_recv_wc *wc)
1744 {
1745 struct ib_mad_send_wr_private *wr;
1746 const struct ib_mad_hdr *mad_hdr;
1747
1748 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1749
1750 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1751 if ((wr->tid == mad_hdr->tid) &&
1752 rcv_has_same_class(wr, wc) &&
1753 /*
1754 * Don't check GID for direct routed MADs.
1755 * These might have permissive LIDs.
1756 */
1757 (is_direct(mad_hdr->mgmt_class) ||
1758 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1759 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1760 }
1761
1762 /*
1763 * It's possible to receive the response before we've
1764 * been notified that the send has completed
1765 */
1766 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1767 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1768 wr->tid == mad_hdr->tid &&
1769 wr->timeout &&
1770 rcv_has_same_class(wr, wc) &&
1771 /*
1772 * Don't check GID for direct routed MADs.
1773 * These might have permissive LIDs.
1774 */
1775 (is_direct(mad_hdr->mgmt_class) ||
1776 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1777 /* Verify request has not been canceled */
1778 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1779 }
1780 return NULL;
1781 }
1782
ib_mark_mad_done(struct ib_mad_send_wr_private * mad_send_wr)1783 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1784 {
1785 mad_send_wr->timeout = 0;
1786 if (mad_send_wr->refcount == 1)
1787 list_move_tail(&mad_send_wr->agent_list,
1788 &mad_send_wr->mad_agent_priv->done_list);
1789 }
1790
ib_mad_complete_recv(struct ib_mad_agent_private * mad_agent_priv,struct ib_mad_recv_wc * mad_recv_wc)1791 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1792 struct ib_mad_recv_wc *mad_recv_wc)
1793 {
1794 struct ib_mad_send_wr_private *mad_send_wr;
1795 struct ib_mad_send_wc mad_send_wc;
1796 unsigned long flags;
1797 int ret;
1798
1799 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1800 ret = ib_mad_enforce_security(mad_agent_priv,
1801 mad_recv_wc->wc->pkey_index);
1802 if (ret) {
1803 ib_free_recv_mad(mad_recv_wc);
1804 deref_mad_agent(mad_agent_priv);
1805 return;
1806 }
1807
1808 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1809 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1810 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1811 mad_recv_wc);
1812 if (!mad_recv_wc) {
1813 deref_mad_agent(mad_agent_priv);
1814 return;
1815 }
1816 }
1817
1818 /* Complete corresponding request */
1819 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1820 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1821 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1822 if (!mad_send_wr) {
1823 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1824 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1825 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1826 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1827 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1828 /* user rmpp is in effect
1829 * and this is an active RMPP MAD
1830 */
1831 mad_agent_priv->agent.recv_handler(
1832 &mad_agent_priv->agent, NULL,
1833 mad_recv_wc);
1834 deref_mad_agent(mad_agent_priv);
1835 } else {
1836 /* not user rmpp, revert to normal behavior and
1837 * drop the mad */
1838 ib_free_recv_mad(mad_recv_wc);
1839 deref_mad_agent(mad_agent_priv);
1840 return;
1841 }
1842 } else {
1843 ib_mark_mad_done(mad_send_wr);
1844 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1845
1846 /* Defined behavior is to complete response before request */
1847 mad_agent_priv->agent.recv_handler(
1848 &mad_agent_priv->agent,
1849 &mad_send_wr->send_buf,
1850 mad_recv_wc);
1851 deref_mad_agent(mad_agent_priv);
1852
1853 mad_send_wc.status = IB_WC_SUCCESS;
1854 mad_send_wc.vendor_err = 0;
1855 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1856 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1857 }
1858 } else {
1859 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
1860 mad_recv_wc);
1861 deref_mad_agent(mad_agent_priv);
1862 }
1863
1864 return;
1865 }
1866
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)1867 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
1868 const struct ib_mad_qp_info *qp_info,
1869 const struct ib_wc *wc,
1870 int port_num,
1871 struct ib_mad_private *recv,
1872 struct ib_mad_private *response)
1873 {
1874 enum smi_forward_action retsmi;
1875 struct ib_smp *smp = (struct ib_smp *)recv->mad;
1876
1877 trace_ib_mad_handle_ib_smi(smp);
1878
1879 if (smi_handle_dr_smp_recv(smp,
1880 rdma_cap_ib_switch(port_priv->device),
1881 port_num,
1882 port_priv->device->phys_port_cnt) ==
1883 IB_SMI_DISCARD)
1884 return IB_SMI_DISCARD;
1885
1886 retsmi = smi_check_forward_dr_smp(smp);
1887 if (retsmi == IB_SMI_LOCAL)
1888 return IB_SMI_HANDLE;
1889
1890 if (retsmi == IB_SMI_SEND) { /* don't forward */
1891 if (smi_handle_dr_smp_send(smp,
1892 rdma_cap_ib_switch(port_priv->device),
1893 port_num) == IB_SMI_DISCARD)
1894 return IB_SMI_DISCARD;
1895
1896 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
1897 return IB_SMI_DISCARD;
1898 } else if (rdma_cap_ib_switch(port_priv->device)) {
1899 /* forward case for switches */
1900 memcpy(response, recv, mad_priv_size(response));
1901 response->header.recv_wc.wc = &response->header.wc;
1902 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1903 response->header.recv_wc.recv_buf.grh = &response->grh;
1904
1905 agent_send_response((const struct ib_mad_hdr *)response->mad,
1906 &response->grh, wc,
1907 port_priv->device,
1908 smi_get_fwd_port(smp),
1909 qp_info->qp->qp_num,
1910 response->mad_size,
1911 false);
1912
1913 return IB_SMI_DISCARD;
1914 }
1915 return IB_SMI_HANDLE;
1916 }
1917
generate_unmatched_resp(const struct ib_mad_private * recv,struct ib_mad_private * response,size_t * resp_len,bool opa)1918 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
1919 struct ib_mad_private *response,
1920 size_t *resp_len, bool opa)
1921 {
1922 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
1923 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
1924
1925 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
1926 recv_hdr->method == IB_MGMT_METHOD_SET) {
1927 memcpy(response, recv, mad_priv_size(response));
1928 response->header.recv_wc.wc = &response->header.wc;
1929 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1930 response->header.recv_wc.recv_buf.grh = &response->grh;
1931 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
1932 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1933 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1934 resp_hdr->status |= IB_SMP_DIRECTION;
1935
1936 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
1937 if (recv_hdr->mgmt_class ==
1938 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
1939 recv_hdr->mgmt_class ==
1940 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1941 *resp_len = opa_get_smp_header_size(
1942 (struct opa_smp *)recv->mad);
1943 else
1944 *resp_len = sizeof(struct ib_mad_hdr);
1945 }
1946
1947 return true;
1948 } else {
1949 return false;
1950 }
1951 }
1952
1953 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)1954 handle_opa_smi(struct ib_mad_port_private *port_priv,
1955 struct ib_mad_qp_info *qp_info,
1956 struct ib_wc *wc,
1957 int port_num,
1958 struct ib_mad_private *recv,
1959 struct ib_mad_private *response)
1960 {
1961 enum smi_forward_action retsmi;
1962 struct opa_smp *smp = (struct opa_smp *)recv->mad;
1963
1964 trace_ib_mad_handle_opa_smi(smp);
1965
1966 if (opa_smi_handle_dr_smp_recv(smp,
1967 rdma_cap_ib_switch(port_priv->device),
1968 port_num,
1969 port_priv->device->phys_port_cnt) ==
1970 IB_SMI_DISCARD)
1971 return IB_SMI_DISCARD;
1972
1973 retsmi = opa_smi_check_forward_dr_smp(smp);
1974 if (retsmi == IB_SMI_LOCAL)
1975 return IB_SMI_HANDLE;
1976
1977 if (retsmi == IB_SMI_SEND) { /* don't forward */
1978 if (opa_smi_handle_dr_smp_send(smp,
1979 rdma_cap_ib_switch(port_priv->device),
1980 port_num) == IB_SMI_DISCARD)
1981 return IB_SMI_DISCARD;
1982
1983 if (opa_smi_check_local_smp(smp, port_priv->device) ==
1984 IB_SMI_DISCARD)
1985 return IB_SMI_DISCARD;
1986
1987 } else if (rdma_cap_ib_switch(port_priv->device)) {
1988 /* forward case for switches */
1989 memcpy(response, recv, mad_priv_size(response));
1990 response->header.recv_wc.wc = &response->header.wc;
1991 response->header.recv_wc.recv_buf.opa_mad =
1992 (struct opa_mad *)response->mad;
1993 response->header.recv_wc.recv_buf.grh = &response->grh;
1994
1995 agent_send_response((const struct ib_mad_hdr *)response->mad,
1996 &response->grh, wc,
1997 port_priv->device,
1998 opa_smi_get_fwd_port(smp),
1999 qp_info->qp->qp_num,
2000 recv->header.wc.byte_len,
2001 true);
2002
2003 return IB_SMI_DISCARD;
2004 }
2005
2006 return IB_SMI_HANDLE;
2007 }
2008
2009 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)2010 handle_smi(struct ib_mad_port_private *port_priv,
2011 struct ib_mad_qp_info *qp_info,
2012 struct ib_wc *wc,
2013 int port_num,
2014 struct ib_mad_private *recv,
2015 struct ib_mad_private *response,
2016 bool opa)
2017 {
2018 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2019
2020 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2021 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2022 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2023 response);
2024
2025 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2026 }
2027
ib_mad_recv_done(struct ib_cq * cq,struct ib_wc * wc)2028 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2029 {
2030 struct ib_mad_port_private *port_priv = cq->cq_context;
2031 struct ib_mad_list_head *mad_list =
2032 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2033 struct ib_mad_qp_info *qp_info;
2034 struct ib_mad_private_header *mad_priv_hdr;
2035 struct ib_mad_private *recv, *response = NULL;
2036 struct ib_mad_agent_private *mad_agent;
2037 int port_num;
2038 int ret = IB_MAD_RESULT_SUCCESS;
2039 size_t mad_size;
2040 u16 resp_mad_pkey_index = 0;
2041 bool opa;
2042
2043 if (list_empty_careful(&port_priv->port_list))
2044 return;
2045
2046 if (wc->status != IB_WC_SUCCESS) {
2047 /*
2048 * Receive errors indicate that the QP has entered the error
2049 * state - error handling/shutdown code will cleanup
2050 */
2051 return;
2052 }
2053
2054 qp_info = mad_list->mad_queue->qp_info;
2055 dequeue_mad(mad_list);
2056
2057 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2058 qp_info->port_priv->port_num);
2059
2060 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2061 mad_list);
2062 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2063 ib_dma_unmap_single(port_priv->device,
2064 recv->header.mapping,
2065 mad_priv_dma_size(recv),
2066 DMA_FROM_DEVICE);
2067
2068 /* Setup MAD receive work completion from "normal" work completion */
2069 recv->header.wc = *wc;
2070 recv->header.recv_wc.wc = &recv->header.wc;
2071
2072 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2073 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2074 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2075 } else {
2076 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2077 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2078 }
2079
2080 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2081 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2082
2083 /* Validate MAD */
2084 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2085 goto out;
2086
2087 trace_ib_mad_recv_done_handler(qp_info, wc,
2088 (struct ib_mad_hdr *)recv->mad);
2089
2090 mad_size = recv->mad_size;
2091 response = alloc_mad_private(mad_size, GFP_KERNEL);
2092 if (!response)
2093 goto out;
2094
2095 if (rdma_cap_ib_switch(port_priv->device))
2096 port_num = wc->port_num;
2097 else
2098 port_num = port_priv->port_num;
2099
2100 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2101 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2102 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2103 response, opa)
2104 == IB_SMI_DISCARD)
2105 goto out;
2106 }
2107
2108 /* Give driver "right of first refusal" on incoming MAD */
2109 if (port_priv->device->ops.process_mad) {
2110 ret = port_priv->device->ops.process_mad(
2111 port_priv->device, 0, port_priv->port_num, wc,
2112 &recv->grh, (const struct ib_mad *)recv->mad,
2113 (struct ib_mad *)response->mad, &mad_size,
2114 &resp_mad_pkey_index);
2115
2116 if (opa)
2117 wc->pkey_index = resp_mad_pkey_index;
2118
2119 if (ret & IB_MAD_RESULT_SUCCESS) {
2120 if (ret & IB_MAD_RESULT_CONSUMED)
2121 goto out;
2122 if (ret & IB_MAD_RESULT_REPLY) {
2123 agent_send_response((const struct ib_mad_hdr *)response->mad,
2124 &recv->grh, wc,
2125 port_priv->device,
2126 port_num,
2127 qp_info->qp->qp_num,
2128 mad_size, opa);
2129 goto out;
2130 }
2131 }
2132 }
2133
2134 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2135 if (mad_agent) {
2136 trace_ib_mad_recv_done_agent(mad_agent);
2137 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2138 /*
2139 * recv is freed up in error cases in ib_mad_complete_recv
2140 * or via recv_handler in ib_mad_complete_recv()
2141 */
2142 recv = NULL;
2143 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2144 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2145 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2146 port_priv->device, port_num,
2147 qp_info->qp->qp_num, mad_size, opa);
2148 }
2149
2150 out:
2151 /* Post another receive request for this QP */
2152 if (response) {
2153 ib_mad_post_receive_mads(qp_info, response);
2154 kfree(recv);
2155 } else
2156 ib_mad_post_receive_mads(qp_info, recv);
2157 }
2158
adjust_timeout(struct ib_mad_agent_private * mad_agent_priv)2159 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2160 {
2161 struct ib_mad_send_wr_private *mad_send_wr;
2162 unsigned long delay;
2163
2164 if (list_empty(&mad_agent_priv->wait_list)) {
2165 cancel_delayed_work(&mad_agent_priv->timed_work);
2166 } else {
2167 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2168 struct ib_mad_send_wr_private,
2169 agent_list);
2170
2171 if (time_after(mad_agent_priv->timeout,
2172 mad_send_wr->timeout)) {
2173 mad_agent_priv->timeout = mad_send_wr->timeout;
2174 delay = mad_send_wr->timeout - jiffies;
2175 if ((long)delay <= 0)
2176 delay = 1;
2177 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2178 &mad_agent_priv->timed_work, delay);
2179 }
2180 }
2181 }
2182
wait_for_response(struct ib_mad_send_wr_private * mad_send_wr)2183 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2184 {
2185 struct ib_mad_agent_private *mad_agent_priv;
2186 struct ib_mad_send_wr_private *temp_mad_send_wr;
2187 struct list_head *list_item;
2188 unsigned long delay;
2189
2190 mad_agent_priv = mad_send_wr->mad_agent_priv;
2191 list_del(&mad_send_wr->agent_list);
2192
2193 delay = mad_send_wr->timeout;
2194 mad_send_wr->timeout += jiffies;
2195
2196 if (delay) {
2197 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2198 temp_mad_send_wr = list_entry(list_item,
2199 struct ib_mad_send_wr_private,
2200 agent_list);
2201 if (time_after(mad_send_wr->timeout,
2202 temp_mad_send_wr->timeout))
2203 break;
2204 }
2205 }
2206 else
2207 list_item = &mad_agent_priv->wait_list;
2208 list_add(&mad_send_wr->agent_list, list_item);
2209
2210 /* Reschedule a work item if we have a shorter timeout */
2211 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2212 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2213 &mad_agent_priv->timed_work, delay);
2214 }
2215
ib_reset_mad_timeout(struct ib_mad_send_wr_private * mad_send_wr,unsigned long timeout_ms)2216 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2217 unsigned long timeout_ms)
2218 {
2219 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2220 wait_for_response(mad_send_wr);
2221 }
2222
2223 /*
2224 * Process a send work completion
2225 */
ib_mad_complete_send_wr(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)2226 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2227 struct ib_mad_send_wc *mad_send_wc)
2228 {
2229 struct ib_mad_agent_private *mad_agent_priv;
2230 unsigned long flags;
2231 int ret;
2232
2233 mad_agent_priv = mad_send_wr->mad_agent_priv;
2234 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2235 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2236 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2237 if (ret == IB_RMPP_RESULT_CONSUMED)
2238 goto done;
2239 } else
2240 ret = IB_RMPP_RESULT_UNHANDLED;
2241
2242 if (mad_send_wc->status != IB_WC_SUCCESS &&
2243 mad_send_wr->status == IB_WC_SUCCESS) {
2244 mad_send_wr->status = mad_send_wc->status;
2245 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2246 }
2247
2248 if (--mad_send_wr->refcount > 0) {
2249 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2250 mad_send_wr->status == IB_WC_SUCCESS) {
2251 wait_for_response(mad_send_wr);
2252 }
2253 goto done;
2254 }
2255
2256 /* Remove send from MAD agent and notify client of completion */
2257 list_del(&mad_send_wr->agent_list);
2258 adjust_timeout(mad_agent_priv);
2259 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2260
2261 if (mad_send_wr->status != IB_WC_SUCCESS )
2262 mad_send_wc->status = mad_send_wr->status;
2263 if (ret == IB_RMPP_RESULT_INTERNAL)
2264 ib_rmpp_send_handler(mad_send_wc);
2265 else
2266 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2267 mad_send_wc);
2268
2269 /* Release reference on agent taken when sending */
2270 deref_mad_agent(mad_agent_priv);
2271 return;
2272 done:
2273 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2274 }
2275
ib_mad_send_done(struct ib_cq * cq,struct ib_wc * wc)2276 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2277 {
2278 struct ib_mad_port_private *port_priv = cq->cq_context;
2279 struct ib_mad_list_head *mad_list =
2280 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2281 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2282 struct ib_mad_qp_info *qp_info;
2283 struct ib_mad_queue *send_queue;
2284 struct ib_mad_send_wc mad_send_wc;
2285 unsigned long flags;
2286 int ret;
2287
2288 if (list_empty_careful(&port_priv->port_list))
2289 return;
2290
2291 if (wc->status != IB_WC_SUCCESS) {
2292 if (!ib_mad_send_error(port_priv, wc))
2293 return;
2294 }
2295
2296 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2297 mad_list);
2298 send_queue = mad_list->mad_queue;
2299 qp_info = send_queue->qp_info;
2300
2301 trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
2302 trace_ib_mad_send_done_handler(mad_send_wr, wc);
2303
2304 retry:
2305 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2306 mad_send_wr->header_mapping,
2307 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2308 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2309 mad_send_wr->payload_mapping,
2310 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2311 queued_send_wr = NULL;
2312 spin_lock_irqsave(&send_queue->lock, flags);
2313 list_del(&mad_list->list);
2314
2315 /* Move queued send to the send queue */
2316 if (send_queue->count-- > send_queue->max_active) {
2317 mad_list = container_of(qp_info->overflow_list.next,
2318 struct ib_mad_list_head, list);
2319 queued_send_wr = container_of(mad_list,
2320 struct ib_mad_send_wr_private,
2321 mad_list);
2322 list_move_tail(&mad_list->list, &send_queue->list);
2323 }
2324 spin_unlock_irqrestore(&send_queue->lock, flags);
2325
2326 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2327 mad_send_wc.status = wc->status;
2328 mad_send_wc.vendor_err = wc->vendor_err;
2329 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2330
2331 if (queued_send_wr) {
2332 trace_ib_mad_send_done_resend(queued_send_wr, qp_info);
2333 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2334 NULL);
2335 if (ret) {
2336 dev_err(&port_priv->device->dev,
2337 "ib_post_send failed: %d\n", ret);
2338 mad_send_wr = queued_send_wr;
2339 wc->status = IB_WC_LOC_QP_OP_ERR;
2340 goto retry;
2341 }
2342 }
2343 }
2344
mark_sends_for_retry(struct ib_mad_qp_info * qp_info)2345 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2346 {
2347 struct ib_mad_send_wr_private *mad_send_wr;
2348 struct ib_mad_list_head *mad_list;
2349 unsigned long flags;
2350
2351 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2352 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2353 mad_send_wr = container_of(mad_list,
2354 struct ib_mad_send_wr_private,
2355 mad_list);
2356 mad_send_wr->retry = 1;
2357 }
2358 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2359 }
2360
ib_mad_send_error(struct ib_mad_port_private * port_priv,struct ib_wc * wc)2361 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2362 struct ib_wc *wc)
2363 {
2364 struct ib_mad_list_head *mad_list =
2365 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2366 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2367 struct ib_mad_send_wr_private *mad_send_wr;
2368 int ret;
2369
2370 /*
2371 * Send errors will transition the QP to SQE - move
2372 * QP to RTS and repost flushed work requests
2373 */
2374 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2375 mad_list);
2376 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2377 if (mad_send_wr->retry) {
2378 /* Repost send */
2379 mad_send_wr->retry = 0;
2380 trace_ib_mad_error_handler(mad_send_wr, qp_info);
2381 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2382 NULL);
2383 if (!ret)
2384 return false;
2385 }
2386 } else {
2387 struct ib_qp_attr *attr;
2388
2389 /* Transition QP to RTS and fail offending send */
2390 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2391 if (attr) {
2392 attr->qp_state = IB_QPS_RTS;
2393 attr->cur_qp_state = IB_QPS_SQE;
2394 ret = ib_modify_qp(qp_info->qp, attr,
2395 IB_QP_STATE | IB_QP_CUR_STATE);
2396 kfree(attr);
2397 if (ret)
2398 dev_err(&port_priv->device->dev,
2399 "%s - ib_modify_qp to RTS: %d\n",
2400 __func__, ret);
2401 else
2402 mark_sends_for_retry(qp_info);
2403 }
2404 }
2405
2406 return true;
2407 }
2408
cancel_mads(struct ib_mad_agent_private * mad_agent_priv)2409 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2410 {
2411 unsigned long flags;
2412 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2413 struct ib_mad_send_wc mad_send_wc;
2414 struct list_head cancel_list;
2415
2416 INIT_LIST_HEAD(&cancel_list);
2417
2418 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2419 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2420 &mad_agent_priv->send_list, agent_list) {
2421 if (mad_send_wr->status == IB_WC_SUCCESS) {
2422 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2423 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2424 }
2425 }
2426
2427 /* Empty wait list to prevent receives from finding a request */
2428 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2429 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2430
2431 /* Report all cancelled requests */
2432 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2433 mad_send_wc.vendor_err = 0;
2434
2435 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2436 &cancel_list, agent_list) {
2437 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2438 list_del(&mad_send_wr->agent_list);
2439 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2440 &mad_send_wc);
2441 deref_mad_agent(mad_agent_priv);
2442 }
2443 }
2444
2445 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)2446 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2447 struct ib_mad_send_buf *send_buf)
2448 {
2449 struct ib_mad_send_wr_private *mad_send_wr;
2450
2451 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2452 agent_list) {
2453 if (&mad_send_wr->send_buf == send_buf)
2454 return mad_send_wr;
2455 }
2456
2457 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2458 agent_list) {
2459 if (is_rmpp_data_mad(mad_agent_priv,
2460 mad_send_wr->send_buf.mad) &&
2461 &mad_send_wr->send_buf == send_buf)
2462 return mad_send_wr;
2463 }
2464 return NULL;
2465 }
2466
ib_modify_mad(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf,u32 timeout_ms)2467 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2468 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2469 {
2470 struct ib_mad_agent_private *mad_agent_priv;
2471 struct ib_mad_send_wr_private *mad_send_wr;
2472 unsigned long flags;
2473 int active;
2474
2475 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2476 agent);
2477 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2478 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2479 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2480 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2481 return -EINVAL;
2482 }
2483
2484 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2485 if (!timeout_ms) {
2486 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2487 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2488 }
2489
2490 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2491 if (active)
2492 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2493 else
2494 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2495
2496 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2497 return 0;
2498 }
2499 EXPORT_SYMBOL(ib_modify_mad);
2500
ib_cancel_mad(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf)2501 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2502 struct ib_mad_send_buf *send_buf)
2503 {
2504 ib_modify_mad(mad_agent, send_buf, 0);
2505 }
2506 EXPORT_SYMBOL(ib_cancel_mad);
2507
local_completions(struct work_struct * work)2508 static void local_completions(struct work_struct *work)
2509 {
2510 struct ib_mad_agent_private *mad_agent_priv;
2511 struct ib_mad_local_private *local;
2512 struct ib_mad_agent_private *recv_mad_agent;
2513 unsigned long flags;
2514 int free_mad;
2515 struct ib_wc wc;
2516 struct ib_mad_send_wc mad_send_wc;
2517 bool opa;
2518
2519 mad_agent_priv =
2520 container_of(work, struct ib_mad_agent_private, local_work);
2521
2522 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2523 mad_agent_priv->qp_info->port_priv->port_num);
2524
2525 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2526 while (!list_empty(&mad_agent_priv->local_list)) {
2527 local = list_entry(mad_agent_priv->local_list.next,
2528 struct ib_mad_local_private,
2529 completion_list);
2530 list_del(&local->completion_list);
2531 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2532 free_mad = 0;
2533 if (local->mad_priv) {
2534 u8 base_version;
2535 recv_mad_agent = local->recv_mad_agent;
2536 if (!recv_mad_agent) {
2537 dev_err(&mad_agent_priv->agent.device->dev,
2538 "No receive MAD agent for local completion\n");
2539 free_mad = 1;
2540 goto local_send_completion;
2541 }
2542
2543 /*
2544 * Defined behavior is to complete response
2545 * before request
2546 */
2547 build_smp_wc(recv_mad_agent->agent.qp,
2548 local->mad_send_wr->send_wr.wr.wr_cqe,
2549 be16_to_cpu(IB_LID_PERMISSIVE),
2550 local->mad_send_wr->send_wr.pkey_index,
2551 recv_mad_agent->agent.port_num, &wc);
2552
2553 local->mad_priv->header.recv_wc.wc = &wc;
2554
2555 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2556 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2557 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2558 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2559 } else {
2560 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2561 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2562 }
2563
2564 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2565 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2566 &local->mad_priv->header.recv_wc.rmpp_list);
2567 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2568 local->mad_priv->header.recv_wc.recv_buf.mad =
2569 (struct ib_mad *)local->mad_priv->mad;
2570 recv_mad_agent->agent.recv_handler(
2571 &recv_mad_agent->agent,
2572 &local->mad_send_wr->send_buf,
2573 &local->mad_priv->header.recv_wc);
2574 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2575 deref_mad_agent(recv_mad_agent);
2576 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2577 }
2578
2579 local_send_completion:
2580 /* Complete send */
2581 mad_send_wc.status = IB_WC_SUCCESS;
2582 mad_send_wc.vendor_err = 0;
2583 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2584 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2585 &mad_send_wc);
2586
2587 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2588 deref_mad_agent(mad_agent_priv);
2589 if (free_mad)
2590 kfree(local->mad_priv);
2591 kfree(local);
2592 }
2593 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2594 }
2595
retry_send(struct ib_mad_send_wr_private * mad_send_wr)2596 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2597 {
2598 int ret;
2599
2600 if (!mad_send_wr->retries_left)
2601 return -ETIMEDOUT;
2602
2603 mad_send_wr->retries_left--;
2604 mad_send_wr->send_buf.retries++;
2605
2606 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2607
2608 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2609 ret = ib_retry_rmpp(mad_send_wr);
2610 switch (ret) {
2611 case IB_RMPP_RESULT_UNHANDLED:
2612 ret = ib_send_mad(mad_send_wr);
2613 break;
2614 case IB_RMPP_RESULT_CONSUMED:
2615 ret = 0;
2616 break;
2617 default:
2618 ret = -ECOMM;
2619 break;
2620 }
2621 } else
2622 ret = ib_send_mad(mad_send_wr);
2623
2624 if (!ret) {
2625 mad_send_wr->refcount++;
2626 list_add_tail(&mad_send_wr->agent_list,
2627 &mad_send_wr->mad_agent_priv->send_list);
2628 }
2629 return ret;
2630 }
2631
timeout_sends(struct work_struct * work)2632 static void timeout_sends(struct work_struct *work)
2633 {
2634 struct ib_mad_agent_private *mad_agent_priv;
2635 struct ib_mad_send_wr_private *mad_send_wr;
2636 struct ib_mad_send_wc mad_send_wc;
2637 unsigned long flags, delay;
2638
2639 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2640 timed_work.work);
2641 mad_send_wc.vendor_err = 0;
2642
2643 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2644 while (!list_empty(&mad_agent_priv->wait_list)) {
2645 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2646 struct ib_mad_send_wr_private,
2647 agent_list);
2648
2649 if (time_after(mad_send_wr->timeout, jiffies)) {
2650 delay = mad_send_wr->timeout - jiffies;
2651 if ((long)delay <= 0)
2652 delay = 1;
2653 queue_delayed_work(mad_agent_priv->qp_info->
2654 port_priv->wq,
2655 &mad_agent_priv->timed_work, delay);
2656 break;
2657 }
2658
2659 list_del(&mad_send_wr->agent_list);
2660 if (mad_send_wr->status == IB_WC_SUCCESS &&
2661 !retry_send(mad_send_wr))
2662 continue;
2663
2664 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2665
2666 if (mad_send_wr->status == IB_WC_SUCCESS)
2667 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2668 else
2669 mad_send_wc.status = mad_send_wr->status;
2670 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2671 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2672 &mad_send_wc);
2673
2674 deref_mad_agent(mad_agent_priv);
2675 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2676 }
2677 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2678 }
2679
2680 /*
2681 * Allocate receive MADs and post receive WRs for them
2682 */
ib_mad_post_receive_mads(struct ib_mad_qp_info * qp_info,struct ib_mad_private * mad)2683 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2684 struct ib_mad_private *mad)
2685 {
2686 unsigned long flags;
2687 int post, ret;
2688 struct ib_mad_private *mad_priv;
2689 struct ib_sge sg_list;
2690 struct ib_recv_wr recv_wr;
2691 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2692
2693 /* Initialize common scatter list fields */
2694 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2695
2696 /* Initialize common receive WR fields */
2697 recv_wr.next = NULL;
2698 recv_wr.sg_list = &sg_list;
2699 recv_wr.num_sge = 1;
2700
2701 do {
2702 /* Allocate and map receive buffer */
2703 if (mad) {
2704 mad_priv = mad;
2705 mad = NULL;
2706 } else {
2707 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2708 GFP_ATOMIC);
2709 if (!mad_priv) {
2710 ret = -ENOMEM;
2711 break;
2712 }
2713 }
2714 sg_list.length = mad_priv_dma_size(mad_priv);
2715 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2716 &mad_priv->grh,
2717 mad_priv_dma_size(mad_priv),
2718 DMA_FROM_DEVICE);
2719 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2720 sg_list.addr))) {
2721 kfree(mad_priv);
2722 ret = -ENOMEM;
2723 break;
2724 }
2725 mad_priv->header.mapping = sg_list.addr;
2726 mad_priv->header.mad_list.mad_queue = recv_queue;
2727 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2728 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2729
2730 /* Post receive WR */
2731 spin_lock_irqsave(&recv_queue->lock, flags);
2732 post = (++recv_queue->count < recv_queue->max_active);
2733 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2734 spin_unlock_irqrestore(&recv_queue->lock, flags);
2735 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
2736 if (ret) {
2737 spin_lock_irqsave(&recv_queue->lock, flags);
2738 list_del(&mad_priv->header.mad_list.list);
2739 recv_queue->count--;
2740 spin_unlock_irqrestore(&recv_queue->lock, flags);
2741 ib_dma_unmap_single(qp_info->port_priv->device,
2742 mad_priv->header.mapping,
2743 mad_priv_dma_size(mad_priv),
2744 DMA_FROM_DEVICE);
2745 kfree(mad_priv);
2746 dev_err(&qp_info->port_priv->device->dev,
2747 "ib_post_recv failed: %d\n", ret);
2748 break;
2749 }
2750 } while (post);
2751
2752 return ret;
2753 }
2754
2755 /*
2756 * Return all the posted receive MADs
2757 */
cleanup_recv_queue(struct ib_mad_qp_info * qp_info)2758 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2759 {
2760 struct ib_mad_private_header *mad_priv_hdr;
2761 struct ib_mad_private *recv;
2762 struct ib_mad_list_head *mad_list;
2763
2764 if (!qp_info->qp)
2765 return;
2766
2767 while (!list_empty(&qp_info->recv_queue.list)) {
2768
2769 mad_list = list_entry(qp_info->recv_queue.list.next,
2770 struct ib_mad_list_head, list);
2771 mad_priv_hdr = container_of(mad_list,
2772 struct ib_mad_private_header,
2773 mad_list);
2774 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2775 header);
2776
2777 /* Remove from posted receive MAD list */
2778 list_del(&mad_list->list);
2779
2780 ib_dma_unmap_single(qp_info->port_priv->device,
2781 recv->header.mapping,
2782 mad_priv_dma_size(recv),
2783 DMA_FROM_DEVICE);
2784 kfree(recv);
2785 }
2786
2787 qp_info->recv_queue.count = 0;
2788 }
2789
2790 /*
2791 * Start the port
2792 */
ib_mad_port_start(struct ib_mad_port_private * port_priv)2793 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2794 {
2795 int ret, i;
2796 struct ib_qp_attr *attr;
2797 struct ib_qp *qp;
2798 u16 pkey_index;
2799
2800 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2801 if (!attr)
2802 return -ENOMEM;
2803
2804 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2805 IB_DEFAULT_PKEY_FULL, &pkey_index);
2806 if (ret)
2807 pkey_index = 0;
2808
2809 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2810 qp = port_priv->qp_info[i].qp;
2811 if (!qp)
2812 continue;
2813
2814 /*
2815 * PKey index for QP1 is irrelevant but
2816 * one is needed for the Reset to Init transition
2817 */
2818 attr->qp_state = IB_QPS_INIT;
2819 attr->pkey_index = pkey_index;
2820 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2821 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2822 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2823 if (ret) {
2824 dev_err(&port_priv->device->dev,
2825 "Couldn't change QP%d state to INIT: %d\n",
2826 i, ret);
2827 goto out;
2828 }
2829
2830 attr->qp_state = IB_QPS_RTR;
2831 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2832 if (ret) {
2833 dev_err(&port_priv->device->dev,
2834 "Couldn't change QP%d state to RTR: %d\n",
2835 i, ret);
2836 goto out;
2837 }
2838
2839 attr->qp_state = IB_QPS_RTS;
2840 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2841 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2842 if (ret) {
2843 dev_err(&port_priv->device->dev,
2844 "Couldn't change QP%d state to RTS: %d\n",
2845 i, ret);
2846 goto out;
2847 }
2848 }
2849
2850 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2851 if (ret) {
2852 dev_err(&port_priv->device->dev,
2853 "Failed to request completion notification: %d\n",
2854 ret);
2855 goto out;
2856 }
2857
2858 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2859 if (!port_priv->qp_info[i].qp)
2860 continue;
2861
2862 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2863 if (ret) {
2864 dev_err(&port_priv->device->dev,
2865 "Couldn't post receive WRs\n");
2866 goto out;
2867 }
2868 }
2869 out:
2870 kfree(attr);
2871 return ret;
2872 }
2873
qp_event_handler(struct ib_event * event,void * qp_context)2874 static void qp_event_handler(struct ib_event *event, void *qp_context)
2875 {
2876 struct ib_mad_qp_info *qp_info = qp_context;
2877
2878 /* It's worse than that! He's dead, Jim! */
2879 dev_err(&qp_info->port_priv->device->dev,
2880 "Fatal error (%d) on MAD QP (%d)\n",
2881 event->event, qp_info->qp->qp_num);
2882 }
2883
init_mad_queue(struct ib_mad_qp_info * qp_info,struct ib_mad_queue * mad_queue)2884 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2885 struct ib_mad_queue *mad_queue)
2886 {
2887 mad_queue->qp_info = qp_info;
2888 mad_queue->count = 0;
2889 spin_lock_init(&mad_queue->lock);
2890 INIT_LIST_HEAD(&mad_queue->list);
2891 }
2892
init_mad_qp(struct ib_mad_port_private * port_priv,struct ib_mad_qp_info * qp_info)2893 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2894 struct ib_mad_qp_info *qp_info)
2895 {
2896 qp_info->port_priv = port_priv;
2897 init_mad_queue(qp_info, &qp_info->send_queue);
2898 init_mad_queue(qp_info, &qp_info->recv_queue);
2899 INIT_LIST_HEAD(&qp_info->overflow_list);
2900 }
2901
create_mad_qp(struct ib_mad_qp_info * qp_info,enum ib_qp_type qp_type)2902 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2903 enum ib_qp_type qp_type)
2904 {
2905 struct ib_qp_init_attr qp_init_attr;
2906 int ret;
2907
2908 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2909 qp_init_attr.send_cq = qp_info->port_priv->cq;
2910 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2911 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2912 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2913 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2914 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2915 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2916 qp_init_attr.qp_type = qp_type;
2917 qp_init_attr.port_num = qp_info->port_priv->port_num;
2918 qp_init_attr.qp_context = qp_info;
2919 qp_init_attr.event_handler = qp_event_handler;
2920 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2921 if (IS_ERR(qp_info->qp)) {
2922 dev_err(&qp_info->port_priv->device->dev,
2923 "Couldn't create ib_mad QP%d\n",
2924 get_spl_qp_index(qp_type));
2925 ret = PTR_ERR(qp_info->qp);
2926 goto error;
2927 }
2928 /* Use minimum queue sizes unless the CQ is resized */
2929 qp_info->send_queue.max_active = mad_sendq_size;
2930 qp_info->recv_queue.max_active = mad_recvq_size;
2931 return 0;
2932
2933 error:
2934 return ret;
2935 }
2936
destroy_mad_qp(struct ib_mad_qp_info * qp_info)2937 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2938 {
2939 if (!qp_info->qp)
2940 return;
2941
2942 ib_destroy_qp(qp_info->qp);
2943 }
2944
2945 /*
2946 * Open the port
2947 * Create the QP, PD, MR, and CQ if needed
2948 */
ib_mad_port_open(struct ib_device * device,int port_num)2949 static int ib_mad_port_open(struct ib_device *device,
2950 int port_num)
2951 {
2952 int ret, cq_size;
2953 struct ib_mad_port_private *port_priv;
2954 unsigned long flags;
2955 char name[sizeof "ib_mad123"];
2956 int has_smi;
2957
2958 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
2959 return -EFAULT;
2960
2961 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
2962 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
2963 return -EFAULT;
2964
2965 /* Create new device info */
2966 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2967 if (!port_priv)
2968 return -ENOMEM;
2969
2970 port_priv->device = device;
2971 port_priv->port_num = port_num;
2972 spin_lock_init(&port_priv->reg_lock);
2973 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2974 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2975
2976 cq_size = mad_sendq_size + mad_recvq_size;
2977 has_smi = rdma_cap_ib_smi(device, port_num);
2978 if (has_smi)
2979 cq_size *= 2;
2980
2981 port_priv->pd = ib_alloc_pd(device, 0);
2982 if (IS_ERR(port_priv->pd)) {
2983 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2984 ret = PTR_ERR(port_priv->pd);
2985 goto error3;
2986 }
2987
2988 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
2989 IB_POLL_UNBOUND_WORKQUEUE);
2990 if (IS_ERR(port_priv->cq)) {
2991 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2992 ret = PTR_ERR(port_priv->cq);
2993 goto error4;
2994 }
2995
2996 if (has_smi) {
2997 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2998 if (ret)
2999 goto error6;
3000 }
3001 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3002 if (ret)
3003 goto error7;
3004
3005 snprintf(name, sizeof name, "ib_mad%d", port_num);
3006 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3007 if (!port_priv->wq) {
3008 ret = -ENOMEM;
3009 goto error8;
3010 }
3011
3012 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3013 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3014 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3015
3016 ret = ib_mad_port_start(port_priv);
3017 if (ret) {
3018 dev_err(&device->dev, "Couldn't start port\n");
3019 goto error9;
3020 }
3021
3022 return 0;
3023
3024 error9:
3025 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3026 list_del_init(&port_priv->port_list);
3027 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3028
3029 destroy_workqueue(port_priv->wq);
3030 error8:
3031 destroy_mad_qp(&port_priv->qp_info[1]);
3032 error7:
3033 destroy_mad_qp(&port_priv->qp_info[0]);
3034 error6:
3035 ib_free_cq(port_priv->cq);
3036 cleanup_recv_queue(&port_priv->qp_info[1]);
3037 cleanup_recv_queue(&port_priv->qp_info[0]);
3038 error4:
3039 ib_dealloc_pd(port_priv->pd);
3040 error3:
3041 kfree(port_priv);
3042
3043 return ret;
3044 }
3045
3046 /*
3047 * Close the port
3048 * If there are no classes using the port, free the port
3049 * resources (CQ, MR, PD, QP) and remove the port's info structure
3050 */
ib_mad_port_close(struct ib_device * device,int port_num)3051 static int ib_mad_port_close(struct ib_device *device, int port_num)
3052 {
3053 struct ib_mad_port_private *port_priv;
3054 unsigned long flags;
3055
3056 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3057 port_priv = __ib_get_mad_port(device, port_num);
3058 if (port_priv == NULL) {
3059 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3060 dev_err(&device->dev, "Port %d not found\n", port_num);
3061 return -ENODEV;
3062 }
3063 list_del_init(&port_priv->port_list);
3064 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3065
3066 destroy_workqueue(port_priv->wq);
3067 destroy_mad_qp(&port_priv->qp_info[1]);
3068 destroy_mad_qp(&port_priv->qp_info[0]);
3069 ib_free_cq(port_priv->cq);
3070 ib_dealloc_pd(port_priv->pd);
3071 cleanup_recv_queue(&port_priv->qp_info[1]);
3072 cleanup_recv_queue(&port_priv->qp_info[0]);
3073 /* XXX: Handle deallocation of MAD registration tables */
3074
3075 kfree(port_priv);
3076
3077 return 0;
3078 }
3079
ib_mad_init_device(struct ib_device * device)3080 static int ib_mad_init_device(struct ib_device *device)
3081 {
3082 int start, i;
3083 unsigned int count = 0;
3084 int ret;
3085
3086 start = rdma_start_port(device);
3087
3088 for (i = start; i <= rdma_end_port(device); i++) {
3089 if (!rdma_cap_ib_mad(device, i))
3090 continue;
3091
3092 ret = ib_mad_port_open(device, i);
3093 if (ret) {
3094 dev_err(&device->dev, "Couldn't open port %d\n", i);
3095 goto error;
3096 }
3097 ret = ib_agent_port_open(device, i);
3098 if (ret) {
3099 dev_err(&device->dev,
3100 "Couldn't open port %d for agents\n", i);
3101 goto error_agent;
3102 }
3103 count++;
3104 }
3105 if (!count)
3106 return -EOPNOTSUPP;
3107
3108 return 0;
3109
3110 error_agent:
3111 if (ib_mad_port_close(device, i))
3112 dev_err(&device->dev, "Couldn't close port %d\n", i);
3113
3114 error:
3115 while (--i >= start) {
3116 if (!rdma_cap_ib_mad(device, i))
3117 continue;
3118
3119 if (ib_agent_port_close(device, i))
3120 dev_err(&device->dev,
3121 "Couldn't close port %d for agents\n", i);
3122 if (ib_mad_port_close(device, i))
3123 dev_err(&device->dev, "Couldn't close port %d\n", i);
3124 }
3125 return ret;
3126 }
3127
ib_mad_remove_device(struct ib_device * device,void * client_data)3128 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3129 {
3130 unsigned int i;
3131
3132 rdma_for_each_port (device, i) {
3133 if (!rdma_cap_ib_mad(device, i))
3134 continue;
3135
3136 if (ib_agent_port_close(device, i))
3137 dev_err(&device->dev,
3138 "Couldn't close port %d for agents\n", i);
3139 if (ib_mad_port_close(device, i))
3140 dev_err(&device->dev, "Couldn't close port %d\n", i);
3141 }
3142 }
3143
3144 static struct ib_client mad_client = {
3145 .name = "mad",
3146 .add = ib_mad_init_device,
3147 .remove = ib_mad_remove_device
3148 };
3149
ib_mad_init(void)3150 int ib_mad_init(void)
3151 {
3152 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3153 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3154
3155 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3156 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3157
3158 INIT_LIST_HEAD(&ib_mad_port_list);
3159
3160 if (ib_register_client(&mad_client)) {
3161 pr_err("Couldn't register ib_mad client\n");
3162 return -EINVAL;
3163 }
3164
3165 return 0;
3166 }
3167
ib_mad_cleanup(void)3168 void ib_mad_cleanup(void)
3169 {
3170 ib_unregister_client(&mad_client);
3171 }
3172
