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