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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
58static 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 struct ib_ud_wr *wr = &mad_send_wr->send_wr;
63 struct rdma_ah_attr attr = {};
64
65 rdma_query_ah(wr->ah, &attr);
66
67 /* These are common */
68 entry->sl = attr.sl;
69 entry->rqpn = wr->remote_qpn;
70 entry->rqkey = wr->remote_qkey;
71 entry->dlid = rdma_ah_get_dlid(&attr);
72}
73#endif
74
75static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
76static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
77
78module_param_named(send_queue_size, mad_sendq_size, int, 0444);
79MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
80module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
81MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
82
83static DEFINE_XARRAY_ALLOC1(ib_mad_clients);
84static u32 ib_mad_client_next;
85static struct list_head ib_mad_port_list;
86
87/* Port list lock */
88static DEFINE_SPINLOCK(ib_mad_port_list_lock);
89
90/* Forward declarations */
91static int method_in_use(struct ib_mad_mgmt_method_table **method,
92 struct ib_mad_reg_req *mad_reg_req);
93static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
94static struct ib_mad_agent_private *find_mad_agent(
95 struct ib_mad_port_private *port_priv,
96 const struct ib_mad_hdr *mad);
97static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
98 struct ib_mad_private *mad);
99static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
100static void timeout_sends(struct work_struct *work);
101static void local_completions(struct work_struct *work);
102static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
103 struct ib_mad_agent_private *agent_priv,
104 u8 mgmt_class);
105static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
106 struct ib_mad_agent_private *agent_priv);
107static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
108 struct ib_wc *wc);
109static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
110
111/*
112 * Returns a ib_mad_port_private structure or NULL for a device/port
113 * Assumes ib_mad_port_list_lock is being held
114 */
115static inline struct ib_mad_port_private *
116__ib_get_mad_port(struct ib_device *device, u32 port_num)
117{
118 struct ib_mad_port_private *entry;
119
120 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
121 if (entry->device == device && entry->port_num == port_num)
122 return entry;
123 }
124 return NULL;
125}
126
127/*
128 * Wrapper function to return a ib_mad_port_private structure or NULL
129 * for a device/port
130 */
131static inline struct ib_mad_port_private *
132ib_get_mad_port(struct ib_device *device, u32 port_num)
133{
134 struct ib_mad_port_private *entry;
135 unsigned long flags;
136
137 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
138 entry = __ib_get_mad_port(device, port_num);
139 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
140
141 return entry;
142}
143
144static inline u8 convert_mgmt_class(u8 mgmt_class)
145{
146 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
147 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
148 0 : mgmt_class;
149}
150
151static int get_spl_qp_index(enum ib_qp_type qp_type)
152{
153 switch (qp_type) {
154 case IB_QPT_SMI:
155 return 0;
156 case IB_QPT_GSI:
157 return 1;
158 default:
159 return -1;
160 }
161}
162
163static int vendor_class_index(u8 mgmt_class)
164{
165 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
166}
167
168static int is_vendor_class(u8 mgmt_class)
169{
170 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
171 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
172 return 0;
173 return 1;
174}
175
176static int is_vendor_oui(char *oui)
177{
178 if (oui[0] || oui[1] || oui[2])
179 return 1;
180 return 0;
181}
182
183static int is_vendor_method_in_use(
184 struct ib_mad_mgmt_vendor_class *vendor_class,
185 struct ib_mad_reg_req *mad_reg_req)
186{
187 struct ib_mad_mgmt_method_table *method;
188 int i;
189
190 for (i = 0; i < MAX_MGMT_OUI; i++) {
191 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
192 method = vendor_class->method_table[i];
193 if (method) {
194 if (method_in_use(&method, mad_reg_req))
195 return 1;
196 else
197 break;
198 }
199 }
200 }
201 return 0;
202}
203
204int ib_response_mad(const struct ib_mad_hdr *hdr)
205{
206 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
207 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
208 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
209 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
210}
211EXPORT_SYMBOL(ib_response_mad);
212
213/*
214 * ib_register_mad_agent - Register to send/receive MADs
215 *
216 * Context: Process context.
217 */
218struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
219 u32 port_num,
220 enum ib_qp_type qp_type,
221 struct ib_mad_reg_req *mad_reg_req,
222 u8 rmpp_version,
223 ib_mad_send_handler send_handler,
224 ib_mad_recv_handler recv_handler,
225 void *context,
226 u32 registration_flags)
227{
228 struct ib_mad_port_private *port_priv;
229 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
230 struct ib_mad_agent_private *mad_agent_priv;
231 struct ib_mad_reg_req *reg_req = NULL;
232 struct ib_mad_mgmt_class_table *class;
233 struct ib_mad_mgmt_vendor_class_table *vendor;
234 struct ib_mad_mgmt_vendor_class *vendor_class;
235 struct ib_mad_mgmt_method_table *method;
236 int ret2, qpn;
237 u8 mgmt_class, vclass;
238
239 if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
240 (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
241 return ERR_PTR(-EPROTONOSUPPORT);
242
243 /* Validate parameters */
244 qpn = get_spl_qp_index(qp_type);
245 if (qpn == -1) {
246 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
247 __func__, qp_type);
248 goto error1;
249 }
250
251 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
252 dev_dbg_ratelimited(&device->dev,
253 "%s: invalid RMPP Version %u\n",
254 __func__, rmpp_version);
255 goto error1;
256 }
257
258 /* Validate MAD registration request if supplied */
259 if (mad_reg_req) {
260 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
261 dev_dbg_ratelimited(&device->dev,
262 "%s: invalid Class Version %u\n",
263 __func__,
264 mad_reg_req->mgmt_class_version);
265 goto error1;
266 }
267 if (!recv_handler) {
268 dev_dbg_ratelimited(&device->dev,
269 "%s: no recv_handler\n", __func__);
270 goto error1;
271 }
272 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
273 /*
274 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
275 * one in this range currently allowed
276 */
277 if (mad_reg_req->mgmt_class !=
278 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
279 dev_dbg_ratelimited(&device->dev,
280 "%s: Invalid Mgmt Class 0x%x\n",
281 __func__, mad_reg_req->mgmt_class);
282 goto error1;
283 }
284 } else if (mad_reg_req->mgmt_class == 0) {
285 /*
286 * Class 0 is reserved in IBA and is used for
287 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
288 */
289 dev_dbg_ratelimited(&device->dev,
290 "%s: Invalid Mgmt Class 0\n",
291 __func__);
292 goto error1;
293 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
294 /*
295 * If class is in "new" vendor range,
296 * ensure supplied OUI is not zero
297 */
298 if (!is_vendor_oui(mad_reg_req->oui)) {
299 dev_dbg_ratelimited(&device->dev,
300 "%s: No OUI specified for class 0x%x\n",
301 __func__,
302 mad_reg_req->mgmt_class);
303 goto error1;
304 }
305 }
306 /* Make sure class supplied is consistent with RMPP */
307 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
308 if (rmpp_version) {
309 dev_dbg_ratelimited(&device->dev,
310 "%s: RMPP version for non-RMPP class 0x%x\n",
311 __func__, mad_reg_req->mgmt_class);
312 goto error1;
313 }
314 }
315
316 /* Make sure class supplied is consistent with QP type */
317 if (qp_type == IB_QPT_SMI) {
318 if ((mad_reg_req->mgmt_class !=
319 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
320 (mad_reg_req->mgmt_class !=
321 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
322 dev_dbg_ratelimited(&device->dev,
323 "%s: Invalid SM QP type: class 0x%x\n",
324 __func__, mad_reg_req->mgmt_class);
325 goto error1;
326 }
327 } else {
328 if ((mad_reg_req->mgmt_class ==
329 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
330 (mad_reg_req->mgmt_class ==
331 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
332 dev_dbg_ratelimited(&device->dev,
333 "%s: Invalid GS QP type: class 0x%x\n",
334 __func__, mad_reg_req->mgmt_class);
335 goto error1;
336 }
337 }
338 } else {
339 /* No registration request supplied */
340 if (!send_handler)
341 goto error1;
342 if (registration_flags & IB_MAD_USER_RMPP)
343 goto error1;
344 }
345
346 /* Validate device and port */
347 port_priv = ib_get_mad_port(device, port_num);
348 if (!port_priv) {
349 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %u\n",
350 __func__, port_num);
351 ret = ERR_PTR(-ENODEV);
352 goto error1;
353 }
354
355 /* Verify the QP requested is supported. For example, Ethernet devices
356 * will not have QP0.
357 */
358 if (!port_priv->qp_info[qpn].qp) {
359 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
360 __func__, qpn);
361 ret = ERR_PTR(-EPROTONOSUPPORT);
362 goto error1;
363 }
364
365 /* Allocate structures */
366 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
367 if (!mad_agent_priv) {
368 ret = ERR_PTR(-ENOMEM);
369 goto error1;
370 }
371
372 if (mad_reg_req) {
373 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
374 if (!reg_req) {
375 ret = ERR_PTR(-ENOMEM);
376 goto error3;
377 }
378 }
379
380 /* Now, fill in the various structures */
381 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
382 mad_agent_priv->reg_req = reg_req;
383 mad_agent_priv->agent.rmpp_version = rmpp_version;
384 mad_agent_priv->agent.device = device;
385 mad_agent_priv->agent.recv_handler = recv_handler;
386 mad_agent_priv->agent.send_handler = send_handler;
387 mad_agent_priv->agent.context = context;
388 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
389 mad_agent_priv->agent.port_num = port_num;
390 mad_agent_priv->agent.flags = registration_flags;
391 spin_lock_init(&mad_agent_priv->lock);
392 INIT_LIST_HEAD(&mad_agent_priv->send_list);
393 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
394 INIT_LIST_HEAD(&mad_agent_priv->done_list);
395 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
396 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
397 INIT_LIST_HEAD(&mad_agent_priv->local_list);
398 INIT_WORK(&mad_agent_priv->local_work, local_completions);
399 refcount_set(&mad_agent_priv->refcount, 1);
400 init_completion(&mad_agent_priv->comp);
401
402 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
403 if (ret2) {
404 ret = ERR_PTR(ret2);
405 goto error4;
406 }
407
408 /*
409 * The mlx4 driver uses the top byte to distinguish which virtual
410 * function generated the MAD, so we must avoid using it.
411 */
412 ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid,
413 mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1),
414 &ib_mad_client_next, GFP_KERNEL);
415 if (ret2 < 0) {
416 ret = ERR_PTR(ret2);
417 goto error5;
418 }
419
420 /*
421 * Make sure MAD registration (if supplied)
422 * is non overlapping with any existing ones
423 */
424 spin_lock_irq(&port_priv->reg_lock);
425 if (mad_reg_req) {
426 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
427 if (!is_vendor_class(mgmt_class)) {
428 class = port_priv->version[mad_reg_req->
429 mgmt_class_version].class;
430 if (class) {
431 method = class->method_table[mgmt_class];
432 if (method) {
433 if (method_in_use(&method,
434 mad_reg_req))
435 goto error6;
436 }
437 }
438 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
439 mgmt_class);
440 } else {
441 /* "New" vendor class range */
442 vendor = port_priv->version[mad_reg_req->
443 mgmt_class_version].vendor;
444 if (vendor) {
445 vclass = vendor_class_index(mgmt_class);
446 vendor_class = vendor->vendor_class[vclass];
447 if (vendor_class) {
448 if (is_vendor_method_in_use(
449 vendor_class,
450 mad_reg_req))
451 goto error6;
452 }
453 }
454 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
455 }
456 if (ret2) {
457 ret = ERR_PTR(ret2);
458 goto error6;
459 }
460 }
461 spin_unlock_irq(&port_priv->reg_lock);
462
463 trace_ib_mad_create_agent(mad_agent_priv);
464 return &mad_agent_priv->agent;
465error6:
466 spin_unlock_irq(&port_priv->reg_lock);
467 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
468error5:
469 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
470error4:
471 kfree(reg_req);
472error3:
473 kfree(mad_agent_priv);
474error1:
475 return ret;
476}
477EXPORT_SYMBOL(ib_register_mad_agent);
478
479static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
480{
481 if (refcount_dec_and_test(&mad_agent_priv->refcount))
482 complete(&mad_agent_priv->comp);
483}
484
485static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
486{
487 struct ib_mad_port_private *port_priv;
488
489 /* Note that we could still be handling received MADs */
490 trace_ib_mad_unregister_agent(mad_agent_priv);
491
492 /*
493 * Canceling all sends results in dropping received response
494 * MADs, preventing us from queuing additional work
495 */
496 cancel_mads(mad_agent_priv);
497 port_priv = mad_agent_priv->qp_info->port_priv;
498 cancel_delayed_work(&mad_agent_priv->timed_work);
499
500 spin_lock_irq(&port_priv->reg_lock);
501 remove_mad_reg_req(mad_agent_priv);
502 spin_unlock_irq(&port_priv->reg_lock);
503 xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
504
505 flush_workqueue(port_priv->wq);
506
507 deref_mad_agent(mad_agent_priv);
508 wait_for_completion(&mad_agent_priv->comp);
509 ib_cancel_rmpp_recvs(mad_agent_priv);
510
511 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
512
513 kfree(mad_agent_priv->reg_req);
514 kfree_rcu(mad_agent_priv, rcu);
515}
516
517/*
518 * ib_unregister_mad_agent - Unregisters a client from using MAD services
519 *
520 * Context: Process context.
521 */
522void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
523{
524 struct ib_mad_agent_private *mad_agent_priv;
525
526 mad_agent_priv = container_of(mad_agent,
527 struct ib_mad_agent_private,
528 agent);
529 unregister_mad_agent(mad_agent_priv);
530}
531EXPORT_SYMBOL(ib_unregister_mad_agent);
532
533static void dequeue_mad(struct ib_mad_list_head *mad_list)
534{
535 struct ib_mad_queue *mad_queue;
536 unsigned long flags;
537
538 mad_queue = mad_list->mad_queue;
539 spin_lock_irqsave(&mad_queue->lock, flags);
540 list_del(&mad_list->list);
541 mad_queue->count--;
542 spin_unlock_irqrestore(&mad_queue->lock, flags);
543}
544
545static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
546 u16 pkey_index, u32 port_num, struct ib_wc *wc)
547{
548 memset(wc, 0, sizeof *wc);
549 wc->wr_cqe = cqe;
550 wc->status = IB_WC_SUCCESS;
551 wc->opcode = IB_WC_RECV;
552 wc->pkey_index = pkey_index;
553 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
554 wc->src_qp = IB_QP0;
555 wc->qp = qp;
556 wc->slid = slid;
557 wc->sl = 0;
558 wc->dlid_path_bits = 0;
559 wc->port_num = port_num;
560}
561
562static size_t mad_priv_size(const struct ib_mad_private *mp)
563{
564 return sizeof(struct ib_mad_private) + mp->mad_size;
565}
566
567static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
568{
569 size_t size = sizeof(struct ib_mad_private) + mad_size;
570 struct ib_mad_private *ret = kzalloc(size, flags);
571
572 if (ret)
573 ret->mad_size = mad_size;
574
575 return ret;
576}
577
578static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
579{
580 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
581}
582
583static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
584{
585 return sizeof(struct ib_grh) + mp->mad_size;
586}
587
588/*
589 * Return 0 if SMP is to be sent
590 * Return 1 if SMP was consumed locally (whether or not solicited)
591 * Return < 0 if error
592 */
593static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
594 struct ib_mad_send_wr_private *mad_send_wr)
595{
596 int ret = 0;
597 struct ib_smp *smp = mad_send_wr->send_buf.mad;
598 struct opa_smp *opa_smp = (struct opa_smp *)smp;
599 unsigned long flags;
600 struct ib_mad_local_private *local;
601 struct ib_mad_private *mad_priv;
602 struct ib_mad_port_private *port_priv;
603 struct ib_mad_agent_private *recv_mad_agent = NULL;
604 struct ib_device *device = mad_agent_priv->agent.device;
605 u32 port_num;
606 struct ib_wc mad_wc;
607 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
608 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
609 u16 out_mad_pkey_index = 0;
610 u16 drslid;
611 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
612 mad_agent_priv->qp_info->port_priv->port_num);
613
614 if (rdma_cap_ib_switch(device) &&
615 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
616 port_num = send_wr->port_num;
617 else
618 port_num = mad_agent_priv->agent.port_num;
619
620 /*
621 * Directed route handling starts if the initial LID routed part of
622 * a request or the ending LID routed part of a response is empty.
623 * If we are at the start of the LID routed part, don't update the
624 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
625 */
626 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
627 u32 opa_drslid;
628
629 trace_ib_mad_handle_out_opa_smi(opa_smp);
630
631 if ((opa_get_smp_direction(opa_smp)
632 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
633 OPA_LID_PERMISSIVE &&
634 opa_smi_handle_dr_smp_send(opa_smp,
635 rdma_cap_ib_switch(device),
636 port_num) == IB_SMI_DISCARD) {
637 ret = -EINVAL;
638 dev_err(&device->dev, "OPA Invalid directed route\n");
639 goto out;
640 }
641 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
642 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
643 opa_drslid & 0xffff0000) {
644 ret = -EINVAL;
645 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
646 opa_drslid);
647 goto out;
648 }
649 drslid = (u16)(opa_drslid & 0x0000ffff);
650
651 /* Check to post send on QP or process locally */
652 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
653 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
654 goto out;
655 } else {
656 trace_ib_mad_handle_out_ib_smi(smp);
657
658 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
659 IB_LID_PERMISSIVE &&
660 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
661 IB_SMI_DISCARD) {
662 ret = -EINVAL;
663 dev_err(&device->dev, "Invalid directed route\n");
664 goto out;
665 }
666 drslid = be16_to_cpu(smp->dr_slid);
667
668 /* Check to post send on QP or process locally */
669 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
670 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
671 goto out;
672 }
673
674 local = kmalloc(sizeof *local, GFP_ATOMIC);
675 if (!local) {
676 ret = -ENOMEM;
677 goto out;
678 }
679 local->mad_priv = NULL;
680 local->recv_mad_agent = NULL;
681 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
682 if (!mad_priv) {
683 ret = -ENOMEM;
684 kfree(local);
685 goto out;
686 }
687
688 build_smp_wc(mad_agent_priv->agent.qp,
689 send_wr->wr.wr_cqe, drslid,
690 send_wr->pkey_index,
691 send_wr->port_num, &mad_wc);
692
693 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
694 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
695 + mad_send_wr->send_buf.data_len
696 + sizeof(struct ib_grh);
697 }
698
699 /* No GRH for DR SMP */
700 ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL,
701 (const struct ib_mad *)smp,
702 (struct ib_mad *)mad_priv->mad, &mad_size,
703 &out_mad_pkey_index);
704 switch (ret) {
705 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
706 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
707 mad_agent_priv->agent.recv_handler) {
708 local->mad_priv = mad_priv;
709 local->recv_mad_agent = mad_agent_priv;
710 /*
711 * Reference MAD agent until receive
712 * side of local completion handled
713 */
714 refcount_inc(&mad_agent_priv->refcount);
715 } else
716 kfree(mad_priv);
717 break;
718 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
719 kfree(mad_priv);
720 break;
721 case IB_MAD_RESULT_SUCCESS:
722 /* Treat like an incoming receive MAD */
723 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
724 mad_agent_priv->agent.port_num);
725 if (port_priv) {
726 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
727 recv_mad_agent = find_mad_agent(port_priv,
728 (const struct ib_mad_hdr *)mad_priv->mad);
729 }
730 if (!port_priv || !recv_mad_agent) {
731 /*
732 * No receiving agent so drop packet and
733 * generate send completion.
734 */
735 kfree(mad_priv);
736 break;
737 }
738 local->mad_priv = mad_priv;
739 local->recv_mad_agent = recv_mad_agent;
740 break;
741 default:
742 kfree(mad_priv);
743 kfree(local);
744 ret = -EINVAL;
745 goto out;
746 }
747
748 local->mad_send_wr = mad_send_wr;
749 if (opa) {
750 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
751 local->return_wc_byte_len = mad_size;
752 }
753 /* Reference MAD agent until send side of local completion handled */
754 refcount_inc(&mad_agent_priv->refcount);
755 /* Queue local completion to local list */
756 spin_lock_irqsave(&mad_agent_priv->lock, flags);
757 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
758 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
759 queue_work(mad_agent_priv->qp_info->port_priv->wq,
760 &mad_agent_priv->local_work);
761 ret = 1;
762out:
763 return ret;
764}
765
766static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
767{
768 int seg_size, pad;
769
770 seg_size = mad_size - hdr_len;
771 if (data_len && seg_size) {
772 pad = seg_size - data_len % seg_size;
773 return pad == seg_size ? 0 : pad;
774 } else
775 return seg_size;
776}
777
778static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
779{
780 struct ib_rmpp_segment *s, *t;
781
782 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
783 list_del(&s->list);
784 kfree(s);
785 }
786}
787
788static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
789 size_t mad_size, gfp_t gfp_mask)
790{
791 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
792 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
793 struct ib_rmpp_segment *seg = NULL;
794 int left, seg_size, pad;
795
796 send_buf->seg_size = mad_size - send_buf->hdr_len;
797 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
798 seg_size = send_buf->seg_size;
799 pad = send_wr->pad;
800
801 /* Allocate data segments. */
802 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
803 seg = kmalloc(sizeof(*seg) + seg_size, gfp_mask);
804 if (!seg) {
805 free_send_rmpp_list(send_wr);
806 return -ENOMEM;
807 }
808 seg->num = ++send_buf->seg_count;
809 list_add_tail(&seg->list, &send_wr->rmpp_list);
810 }
811
812 /* Zero any padding */
813 if (pad)
814 memset(seg->data + seg_size - pad, 0, pad);
815
816 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
817 agent.rmpp_version;
818 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
819 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
820
821 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
822 struct ib_rmpp_segment, list);
823 send_wr->last_ack_seg = send_wr->cur_seg;
824 return 0;
825}
826
827int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
828{
829 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
830}
831EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
832
833struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
834 u32 remote_qpn, u16 pkey_index,
835 int rmpp_active, int hdr_len,
836 int data_len, gfp_t gfp_mask,
837 u8 base_version)
838{
839 struct ib_mad_agent_private *mad_agent_priv;
840 struct ib_mad_send_wr_private *mad_send_wr;
841 int pad, message_size, ret, size;
842 void *buf;
843 size_t mad_size;
844 bool opa;
845
846 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
847 agent);
848
849 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
850
851 if (opa && base_version == OPA_MGMT_BASE_VERSION)
852 mad_size = sizeof(struct opa_mad);
853 else
854 mad_size = sizeof(struct ib_mad);
855
856 pad = get_pad_size(hdr_len, data_len, mad_size);
857 message_size = hdr_len + data_len + pad;
858
859 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
860 if (!rmpp_active && message_size > mad_size)
861 return ERR_PTR(-EINVAL);
862 } else
863 if (rmpp_active || message_size > mad_size)
864 return ERR_PTR(-EINVAL);
865
866 size = rmpp_active ? hdr_len : mad_size;
867 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
868 if (!buf)
869 return ERR_PTR(-ENOMEM);
870
871 mad_send_wr = buf + size;
872 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
873 mad_send_wr->send_buf.mad = buf;
874 mad_send_wr->send_buf.hdr_len = hdr_len;
875 mad_send_wr->send_buf.data_len = data_len;
876 mad_send_wr->pad = pad;
877
878 mad_send_wr->mad_agent_priv = mad_agent_priv;
879 mad_send_wr->sg_list[0].length = hdr_len;
880 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
881
882 /* OPA MADs don't have to be the full 2048 bytes */
883 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
884 data_len < mad_size - hdr_len)
885 mad_send_wr->sg_list[1].length = data_len;
886 else
887 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
888
889 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
890
891 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
892
893 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
894 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
895 mad_send_wr->send_wr.wr.num_sge = 2;
896 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
897 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
898 mad_send_wr->send_wr.remote_qpn = remote_qpn;
899 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
900 mad_send_wr->send_wr.pkey_index = pkey_index;
901
902 if (rmpp_active) {
903 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
904 if (ret) {
905 kfree(buf);
906 return ERR_PTR(ret);
907 }
908 }
909
910 mad_send_wr->send_buf.mad_agent = mad_agent;
911 refcount_inc(&mad_agent_priv->refcount);
912 return &mad_send_wr->send_buf;
913}
914EXPORT_SYMBOL(ib_create_send_mad);
915
916int ib_get_mad_data_offset(u8 mgmt_class)
917{
918 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
919 return IB_MGMT_SA_HDR;
920 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
921 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
922 (mgmt_class == IB_MGMT_CLASS_BIS))
923 return IB_MGMT_DEVICE_HDR;
924 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
925 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
926 return IB_MGMT_VENDOR_HDR;
927 else
928 return IB_MGMT_MAD_HDR;
929}
930EXPORT_SYMBOL(ib_get_mad_data_offset);
931
932int ib_is_mad_class_rmpp(u8 mgmt_class)
933{
934 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
935 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
936 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
937 (mgmt_class == IB_MGMT_CLASS_BIS) ||
938 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
939 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
940 return 1;
941 return 0;
942}
943EXPORT_SYMBOL(ib_is_mad_class_rmpp);
944
945void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
946{
947 struct ib_mad_send_wr_private *mad_send_wr;
948 struct list_head *list;
949
950 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
951 send_buf);
952 list = &mad_send_wr->cur_seg->list;
953
954 if (mad_send_wr->cur_seg->num < seg_num) {
955 list_for_each_entry(mad_send_wr->cur_seg, list, list)
956 if (mad_send_wr->cur_seg->num == seg_num)
957 break;
958 } else if (mad_send_wr->cur_seg->num > seg_num) {
959 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
960 if (mad_send_wr->cur_seg->num == seg_num)
961 break;
962 }
963 return mad_send_wr->cur_seg->data;
964}
965EXPORT_SYMBOL(ib_get_rmpp_segment);
966
967static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
968{
969 if (mad_send_wr->send_buf.seg_count)
970 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
971 mad_send_wr->seg_num);
972 else
973 return mad_send_wr->send_buf.mad +
974 mad_send_wr->send_buf.hdr_len;
975}
976
977void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
978{
979 struct ib_mad_agent_private *mad_agent_priv;
980 struct ib_mad_send_wr_private *mad_send_wr;
981
982 mad_agent_priv = container_of(send_buf->mad_agent,
983 struct ib_mad_agent_private, agent);
984 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
985 send_buf);
986
987 free_send_rmpp_list(mad_send_wr);
988 kfree(send_buf->mad);
989 deref_mad_agent(mad_agent_priv);
990}
991EXPORT_SYMBOL(ib_free_send_mad);
992
993int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
994{
995 struct ib_mad_qp_info *qp_info;
996 struct list_head *list;
997 struct ib_mad_agent *mad_agent;
998 struct ib_sge *sge;
999 unsigned long flags;
1000 int ret;
1001
1002 /* Set WR ID to find mad_send_wr upon completion */
1003 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1004 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1005 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1006 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1007
1008 mad_agent = mad_send_wr->send_buf.mad_agent;
1009 sge = mad_send_wr->sg_list;
1010 sge[0].addr = ib_dma_map_single(mad_agent->device,
1011 mad_send_wr->send_buf.mad,
1012 sge[0].length,
1013 DMA_TO_DEVICE);
1014 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1015 return -ENOMEM;
1016
1017 mad_send_wr->header_mapping = sge[0].addr;
1018
1019 sge[1].addr = ib_dma_map_single(mad_agent->device,
1020 ib_get_payload(mad_send_wr),
1021 sge[1].length,
1022 DMA_TO_DEVICE);
1023 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1024 ib_dma_unmap_single(mad_agent->device,
1025 mad_send_wr->header_mapping,
1026 sge[0].length, DMA_TO_DEVICE);
1027 return -ENOMEM;
1028 }
1029 mad_send_wr->payload_mapping = sge[1].addr;
1030
1031 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1032 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1033 trace_ib_mad_ib_send_mad(mad_send_wr, qp_info);
1034 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1035 NULL);
1036 list = &qp_info->send_queue.list;
1037 } else {
1038 ret = 0;
1039 list = &qp_info->overflow_list;
1040 }
1041
1042 if (!ret) {
1043 qp_info->send_queue.count++;
1044 list_add_tail(&mad_send_wr->mad_list.list, list);
1045 }
1046 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1047 if (ret) {
1048 ib_dma_unmap_single(mad_agent->device,
1049 mad_send_wr->header_mapping,
1050 sge[0].length, DMA_TO_DEVICE);
1051 ib_dma_unmap_single(mad_agent->device,
1052 mad_send_wr->payload_mapping,
1053 sge[1].length, DMA_TO_DEVICE);
1054 }
1055 return ret;
1056}
1057
1058/*
1059 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1060 * with the registered client
1061 */
1062int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1063 struct ib_mad_send_buf **bad_send_buf)
1064{
1065 struct ib_mad_agent_private *mad_agent_priv;
1066 struct ib_mad_send_buf *next_send_buf;
1067 struct ib_mad_send_wr_private *mad_send_wr;
1068 unsigned long flags;
1069 int ret = -EINVAL;
1070
1071 /* Walk list of send WRs and post each on send list */
1072 for (; send_buf; send_buf = next_send_buf) {
1073 mad_send_wr = container_of(send_buf,
1074 struct ib_mad_send_wr_private,
1075 send_buf);
1076 mad_agent_priv = mad_send_wr->mad_agent_priv;
1077
1078 ret = ib_mad_enforce_security(mad_agent_priv,
1079 mad_send_wr->send_wr.pkey_index);
1080 if (ret)
1081 goto error;
1082
1083 if (!send_buf->mad_agent->send_handler ||
1084 (send_buf->timeout_ms &&
1085 !send_buf->mad_agent->recv_handler)) {
1086 ret = -EINVAL;
1087 goto error;
1088 }
1089
1090 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1091 if (mad_agent_priv->agent.rmpp_version) {
1092 ret = -EINVAL;
1093 goto error;
1094 }
1095 }
1096
1097 /*
1098 * Save pointer to next work request to post in case the
1099 * current one completes, and the user modifies the work
1100 * request associated with the completion
1101 */
1102 next_send_buf = send_buf->next;
1103 mad_send_wr->send_wr.ah = send_buf->ah;
1104
1105 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1106 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1107 ret = handle_outgoing_dr_smp(mad_agent_priv,
1108 mad_send_wr);
1109 if (ret < 0) /* error */
1110 goto error;
1111 else if (ret == 1) /* locally consumed */
1112 continue;
1113 }
1114
1115 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1116 /* Timeout will be updated after send completes */
1117 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1118 mad_send_wr->max_retries = send_buf->retries;
1119 mad_send_wr->retries_left = send_buf->retries;
1120 send_buf->retries = 0;
1121 /* Reference for work request to QP + response */
1122 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1123 mad_send_wr->status = IB_WC_SUCCESS;
1124
1125 /* Reference MAD agent until send completes */
1126 refcount_inc(&mad_agent_priv->refcount);
1127 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1128 list_add_tail(&mad_send_wr->agent_list,
1129 &mad_agent_priv->send_list);
1130 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1131
1132 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1133 ret = ib_send_rmpp_mad(mad_send_wr);
1134 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1135 ret = ib_send_mad(mad_send_wr);
1136 } else
1137 ret = ib_send_mad(mad_send_wr);
1138 if (ret < 0) {
1139 /* Fail send request */
1140 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1141 list_del(&mad_send_wr->agent_list);
1142 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1143 deref_mad_agent(mad_agent_priv);
1144 goto error;
1145 }
1146 }
1147 return 0;
1148error:
1149 if (bad_send_buf)
1150 *bad_send_buf = send_buf;
1151 return ret;
1152}
1153EXPORT_SYMBOL(ib_post_send_mad);
1154
1155/*
1156 * ib_free_recv_mad - Returns data buffers used to receive
1157 * a MAD to the access layer
1158 */
1159void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1160{
1161 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1162 struct ib_mad_private_header *mad_priv_hdr;
1163 struct ib_mad_private *priv;
1164 struct list_head free_list;
1165
1166 INIT_LIST_HEAD(&free_list);
1167 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1168
1169 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1170 &free_list, list) {
1171 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1172 recv_buf);
1173 mad_priv_hdr = container_of(mad_recv_wc,
1174 struct ib_mad_private_header,
1175 recv_wc);
1176 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1177 header);
1178 kfree(priv);
1179 }
1180}
1181EXPORT_SYMBOL(ib_free_recv_mad);
1182
1183static int method_in_use(struct ib_mad_mgmt_method_table **method,
1184 struct ib_mad_reg_req *mad_reg_req)
1185{
1186 int i;
1187
1188 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1189 if ((*method)->agent[i]) {
1190 pr_err("Method %d already in use\n", i);
1191 return -EINVAL;
1192 }
1193 }
1194 return 0;
1195}
1196
1197static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1198{
1199 /* Allocate management method table */
1200 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1201 return (*method) ? 0 : (-ENOMEM);
1202}
1203
1204/*
1205 * Check to see if there are any methods still in use
1206 */
1207static int check_method_table(struct ib_mad_mgmt_method_table *method)
1208{
1209 int i;
1210
1211 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1212 if (method->agent[i])
1213 return 1;
1214 return 0;
1215}
1216
1217/*
1218 * Check to see if there are any method tables for this class still in use
1219 */
1220static int check_class_table(struct ib_mad_mgmt_class_table *class)
1221{
1222 int i;
1223
1224 for (i = 0; i < MAX_MGMT_CLASS; i++)
1225 if (class->method_table[i])
1226 return 1;
1227 return 0;
1228}
1229
1230static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1231{
1232 int i;
1233
1234 for (i = 0; i < MAX_MGMT_OUI; i++)
1235 if (vendor_class->method_table[i])
1236 return 1;
1237 return 0;
1238}
1239
1240static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1241 const char *oui)
1242{
1243 int i;
1244
1245 for (i = 0; i < MAX_MGMT_OUI; i++)
1246 /* Is there matching OUI for this vendor class ? */
1247 if (!memcmp(vendor_class->oui[i], oui, 3))
1248 return i;
1249
1250 return -1;
1251}
1252
1253static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1254{
1255 int i;
1256
1257 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1258 if (vendor->vendor_class[i])
1259 return 1;
1260
1261 return 0;
1262}
1263
1264static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1265 struct ib_mad_agent_private *agent)
1266{
1267 int i;
1268
1269 /* Remove any methods for this mad agent */
1270 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1271 if (method->agent[i] == agent)
1272 method->agent[i] = NULL;
1273}
1274
1275static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1276 struct ib_mad_agent_private *agent_priv,
1277 u8 mgmt_class)
1278{
1279 struct ib_mad_port_private *port_priv;
1280 struct ib_mad_mgmt_class_table **class;
1281 struct ib_mad_mgmt_method_table **method;
1282 int i, ret;
1283
1284 port_priv = agent_priv->qp_info->port_priv;
1285 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1286 if (!*class) {
1287 /* Allocate management class table for "new" class version */
1288 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1289 if (!*class) {
1290 ret = -ENOMEM;
1291 goto error1;
1292 }
1293
1294 /* Allocate method table for this management class */
1295 method = &(*class)->method_table[mgmt_class];
1296 if ((ret = allocate_method_table(method)))
1297 goto error2;
1298 } else {
1299 method = &(*class)->method_table[mgmt_class];
1300 if (!*method) {
1301 /* Allocate method table for this management class */
1302 if ((ret = allocate_method_table(method)))
1303 goto error1;
1304 }
1305 }
1306
1307 /* Now, make sure methods are not already in use */
1308 if (method_in_use(method, mad_reg_req))
1309 goto error3;
1310
1311 /* Finally, add in methods being registered */
1312 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1313 (*method)->agent[i] = agent_priv;
1314
1315 return 0;
1316
1317error3:
1318 /* Remove any methods for this mad agent */
1319 remove_methods_mad_agent(*method, agent_priv);
1320 /* Now, check to see if there are any methods in use */
1321 if (!check_method_table(*method)) {
1322 /* If not, release management method table */
1323 kfree(*method);
1324 *method = NULL;
1325 }
1326 ret = -EINVAL;
1327 goto error1;
1328error2:
1329 kfree(*class);
1330 *class = NULL;
1331error1:
1332 return ret;
1333}
1334
1335static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1336 struct ib_mad_agent_private *agent_priv)
1337{
1338 struct ib_mad_port_private *port_priv;
1339 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1340 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1341 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1342 struct ib_mad_mgmt_method_table **method;
1343 int i, ret = -ENOMEM;
1344 u8 vclass;
1345
1346 /* "New" vendor (with OUI) class */
1347 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1348 port_priv = agent_priv->qp_info->port_priv;
1349 vendor_table = &port_priv->version[
1350 mad_reg_req->mgmt_class_version].vendor;
1351 if (!*vendor_table) {
1352 /* Allocate mgmt vendor class table for "new" class version */
1353 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1354 if (!vendor)
1355 goto error1;
1356
1357 *vendor_table = vendor;
1358 }
1359 if (!(*vendor_table)->vendor_class[vclass]) {
1360 /* Allocate table for this management vendor class */
1361 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1362 if (!vendor_class)
1363 goto error2;
1364
1365 (*vendor_table)->vendor_class[vclass] = vendor_class;
1366 }
1367 for (i = 0; i < MAX_MGMT_OUI; i++) {
1368 /* Is there matching OUI for this vendor class ? */
1369 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1370 mad_reg_req->oui, 3)) {
1371 method = &(*vendor_table)->vendor_class[
1372 vclass]->method_table[i];
1373 if (!*method)
1374 goto error3;
1375 goto check_in_use;
1376 }
1377 }
1378 for (i = 0; i < MAX_MGMT_OUI; i++) {
1379 /* OUI slot available ? */
1380 if (!is_vendor_oui((*vendor_table)->vendor_class[
1381 vclass]->oui[i])) {
1382 method = &(*vendor_table)->vendor_class[
1383 vclass]->method_table[i];
1384 /* Allocate method table for this OUI */
1385 if (!*method) {
1386 ret = allocate_method_table(method);
1387 if (ret)
1388 goto error3;
1389 }
1390 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1391 mad_reg_req->oui, 3);
1392 goto check_in_use;
1393 }
1394 }
1395 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1396 goto error3;
1397
1398check_in_use:
1399 /* Now, make sure methods are not already in use */
1400 if (method_in_use(method, mad_reg_req))
1401 goto error4;
1402
1403 /* Finally, add in methods being registered */
1404 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1405 (*method)->agent[i] = agent_priv;
1406
1407 return 0;
1408
1409error4:
1410 /* Remove any methods for this mad agent */
1411 remove_methods_mad_agent(*method, agent_priv);
1412 /* Now, check to see if there are any methods in use */
1413 if (!check_method_table(*method)) {
1414 /* If not, release management method table */
1415 kfree(*method);
1416 *method = NULL;
1417 }
1418 ret = -EINVAL;
1419error3:
1420 if (vendor_class) {
1421 (*vendor_table)->vendor_class[vclass] = NULL;
1422 kfree(vendor_class);
1423 }
1424error2:
1425 if (vendor) {
1426 *vendor_table = NULL;
1427 kfree(vendor);
1428 }
1429error1:
1430 return ret;
1431}
1432
1433static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1434{
1435 struct ib_mad_port_private *port_priv;
1436 struct ib_mad_mgmt_class_table *class;
1437 struct ib_mad_mgmt_method_table *method;
1438 struct ib_mad_mgmt_vendor_class_table *vendor;
1439 struct ib_mad_mgmt_vendor_class *vendor_class;
1440 int index;
1441 u8 mgmt_class;
1442
1443 /*
1444 * Was MAD registration request supplied
1445 * with original registration ?
1446 */
1447 if (!agent_priv->reg_req)
1448 goto out;
1449
1450 port_priv = agent_priv->qp_info->port_priv;
1451 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1452 class = port_priv->version[
1453 agent_priv->reg_req->mgmt_class_version].class;
1454 if (!class)
1455 goto vendor_check;
1456
1457 method = class->method_table[mgmt_class];
1458 if (method) {
1459 /* Remove any methods for this mad agent */
1460 remove_methods_mad_agent(method, agent_priv);
1461 /* Now, check to see if there are any methods still in use */
1462 if (!check_method_table(method)) {
1463 /* If not, release management method table */
1464 kfree(method);
1465 class->method_table[mgmt_class] = NULL;
1466 /* Any management classes left ? */
1467 if (!check_class_table(class)) {
1468 /* If not, release management class table */
1469 kfree(class);
1470 port_priv->version[
1471 agent_priv->reg_req->
1472 mgmt_class_version].class = NULL;
1473 }
1474 }
1475 }
1476
1477vendor_check:
1478 if (!is_vendor_class(mgmt_class))
1479 goto out;
1480
1481 /* normalize mgmt_class to vendor range 2 */
1482 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1483 vendor = port_priv->version[
1484 agent_priv->reg_req->mgmt_class_version].vendor;
1485
1486 if (!vendor)
1487 goto out;
1488
1489 vendor_class = vendor->vendor_class[mgmt_class];
1490 if (vendor_class) {
1491 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1492 if (index < 0)
1493 goto out;
1494 method = vendor_class->method_table[index];
1495 if (method) {
1496 /* Remove any methods for this mad agent */
1497 remove_methods_mad_agent(method, agent_priv);
1498 /*
1499 * Now, check to see if there are
1500 * any methods still in use
1501 */
1502 if (!check_method_table(method)) {
1503 /* If not, release management method table */
1504 kfree(method);
1505 vendor_class->method_table[index] = NULL;
1506 memset(vendor_class->oui[index], 0, 3);
1507 /* Any OUIs left ? */
1508 if (!check_vendor_class(vendor_class)) {
1509 /* If not, release vendor class table */
1510 kfree(vendor_class);
1511 vendor->vendor_class[mgmt_class] = NULL;
1512 /* Any other vendor classes left ? */
1513 if (!check_vendor_table(vendor)) {
1514 kfree(vendor);
1515 port_priv->version[
1516 agent_priv->reg_req->
1517 mgmt_class_version].
1518 vendor = NULL;
1519 }
1520 }
1521 }
1522 }
1523 }
1524
1525out:
1526 return;
1527}
1528
1529static struct ib_mad_agent_private *
1530find_mad_agent(struct ib_mad_port_private *port_priv,
1531 const struct ib_mad_hdr *mad_hdr)
1532{
1533 struct ib_mad_agent_private *mad_agent = NULL;
1534 unsigned long flags;
1535
1536 if (ib_response_mad(mad_hdr)) {
1537 u32 hi_tid;
1538
1539 /*
1540 * Routing is based on high 32 bits of transaction ID
1541 * of MAD.
1542 */
1543 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1544 rcu_read_lock();
1545 mad_agent = xa_load(&ib_mad_clients, hi_tid);
1546 if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount))
1547 mad_agent = NULL;
1548 rcu_read_unlock();
1549 } else {
1550 struct ib_mad_mgmt_class_table *class;
1551 struct ib_mad_mgmt_method_table *method;
1552 struct ib_mad_mgmt_vendor_class_table *vendor;
1553 struct ib_mad_mgmt_vendor_class *vendor_class;
1554 const struct ib_vendor_mad *vendor_mad;
1555 int index;
1556
1557 spin_lock_irqsave(&port_priv->reg_lock, flags);
1558 /*
1559 * Routing is based on version, class, and method
1560 * For "newer" vendor MADs, also based on OUI
1561 */
1562 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1563 goto out;
1564 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1565 class = port_priv->version[
1566 mad_hdr->class_version].class;
1567 if (!class)
1568 goto out;
1569 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1570 ARRAY_SIZE(class->method_table))
1571 goto out;
1572 method = class->method_table[convert_mgmt_class(
1573 mad_hdr->mgmt_class)];
1574 if (method)
1575 mad_agent = method->agent[mad_hdr->method &
1576 ~IB_MGMT_METHOD_RESP];
1577 } else {
1578 vendor = port_priv->version[
1579 mad_hdr->class_version].vendor;
1580 if (!vendor)
1581 goto out;
1582 vendor_class = vendor->vendor_class[vendor_class_index(
1583 mad_hdr->mgmt_class)];
1584 if (!vendor_class)
1585 goto out;
1586 /* Find matching OUI */
1587 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1588 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1589 if (index == -1)
1590 goto out;
1591 method = vendor_class->method_table[index];
1592 if (method) {
1593 mad_agent = method->agent[mad_hdr->method &
1594 ~IB_MGMT_METHOD_RESP];
1595 }
1596 }
1597 if (mad_agent)
1598 refcount_inc(&mad_agent->refcount);
1599out:
1600 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1601 }
1602
1603 if (mad_agent && !mad_agent->agent.recv_handler) {
1604 dev_notice(&port_priv->device->dev,
1605 "No receive handler for client %p on port %u\n",
1606 &mad_agent->agent, port_priv->port_num);
1607 deref_mad_agent(mad_agent);
1608 mad_agent = NULL;
1609 }
1610
1611 return mad_agent;
1612}
1613
1614static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1615 const struct ib_mad_qp_info *qp_info,
1616 bool opa)
1617{
1618 int valid = 0;
1619 u32 qp_num = qp_info->qp->qp_num;
1620
1621 /* Make sure MAD base version is understood */
1622 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1623 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1624 pr_err("MAD received with unsupported base version %u %s\n",
1625 mad_hdr->base_version, opa ? "(opa)" : "");
1626 goto out;
1627 }
1628
1629 /* Filter SMI packets sent to other than QP0 */
1630 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1631 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1632 if (qp_num == 0)
1633 valid = 1;
1634 } else {
1635 /* CM attributes other than ClassPortInfo only use Send method */
1636 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1637 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1638 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1639 goto out;
1640 /* Filter GSI packets sent to QP0 */
1641 if (qp_num != 0)
1642 valid = 1;
1643 }
1644
1645out:
1646 return valid;
1647}
1648
1649static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1650 const struct ib_mad_hdr *mad_hdr)
1651{
1652 struct ib_rmpp_mad *rmpp_mad;
1653
1654 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1655 return !mad_agent_priv->agent.rmpp_version ||
1656 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1657 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1658 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1659 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1660}
1661
1662static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1663 const struct ib_mad_recv_wc *rwc)
1664{
1665 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1666 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1667}
1668
1669static inline int
1670rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1671 const struct ib_mad_send_wr_private *wr,
1672 const struct ib_mad_recv_wc *rwc)
1673{
1674 struct rdma_ah_attr attr;
1675 u8 send_resp, rcv_resp;
1676 union ib_gid sgid;
1677 struct ib_device *device = mad_agent_priv->agent.device;
1678 u32 port_num = mad_agent_priv->agent.port_num;
1679 u8 lmc;
1680 bool has_grh;
1681
1682 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1683 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1684
1685 if (send_resp == rcv_resp)
1686 /* both requests, or both responses. GIDs different */
1687 return 0;
1688
1689 if (rdma_query_ah(wr->send_buf.ah, &attr))
1690 /* Assume not equal, to avoid false positives. */
1691 return 0;
1692
1693 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1694 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1695 /* one has GID, other does not. Assume different */
1696 return 0;
1697
1698 if (!send_resp && rcv_resp) {
1699 /* is request/response. */
1700 if (!has_grh) {
1701 if (ib_get_cached_lmc(device, port_num, &lmc))
1702 return 0;
1703 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1704 rwc->wc->dlid_path_bits) &
1705 ((1 << lmc) - 1)));
1706 } else {
1707 const struct ib_global_route *grh =
1708 rdma_ah_read_grh(&attr);
1709
1710 if (rdma_query_gid(device, port_num,
1711 grh->sgid_index, &sgid))
1712 return 0;
1713 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1714 16);
1715 }
1716 }
1717
1718 if (!has_grh)
1719 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1720 else
1721 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1722 rwc->recv_buf.grh->sgid.raw,
1723 16);
1724}
1725
1726static inline int is_direct(u8 class)
1727{
1728 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1729}
1730
1731struct ib_mad_send_wr_private*
1732ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1733 const struct ib_mad_recv_wc *wc)
1734{
1735 struct ib_mad_send_wr_private *wr;
1736 const struct ib_mad_hdr *mad_hdr;
1737
1738 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1739
1740 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1741 if ((wr->tid == mad_hdr->tid) &&
1742 rcv_has_same_class(wr, wc) &&
1743 /*
1744 * Don't check GID for direct routed MADs.
1745 * These might have permissive LIDs.
1746 */
1747 (is_direct(mad_hdr->mgmt_class) ||
1748 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1749 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1750 }
1751
1752 /*
1753 * It's possible to receive the response before we've
1754 * been notified that the send has completed
1755 */
1756 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1757 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1758 wr->tid == mad_hdr->tid &&
1759 wr->timeout &&
1760 rcv_has_same_class(wr, wc) &&
1761 /*
1762 * Don't check GID for direct routed MADs.
1763 * These might have permissive LIDs.
1764 */
1765 (is_direct(mad_hdr->mgmt_class) ||
1766 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1767 /* Verify request has not been canceled */
1768 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1769 }
1770 return NULL;
1771}
1772
1773void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1774{
1775 mad_send_wr->timeout = 0;
1776 if (mad_send_wr->refcount == 1)
1777 list_move_tail(&mad_send_wr->agent_list,
1778 &mad_send_wr->mad_agent_priv->done_list);
1779}
1780
1781static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1782 struct ib_mad_recv_wc *mad_recv_wc)
1783{
1784 struct ib_mad_send_wr_private *mad_send_wr;
1785 struct ib_mad_send_wc mad_send_wc;
1786 unsigned long flags;
1787 int ret;
1788
1789 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1790 ret = ib_mad_enforce_security(mad_agent_priv,
1791 mad_recv_wc->wc->pkey_index);
1792 if (ret) {
1793 ib_free_recv_mad(mad_recv_wc);
1794 deref_mad_agent(mad_agent_priv);
1795 return;
1796 }
1797
1798 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1799 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1800 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1801 mad_recv_wc);
1802 if (!mad_recv_wc) {
1803 deref_mad_agent(mad_agent_priv);
1804 return;
1805 }
1806 }
1807
1808 /* Complete corresponding request */
1809 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1810 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1811 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1812 if (!mad_send_wr) {
1813 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1814 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1815 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1816 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1817 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1818 /* user rmpp is in effect
1819 * and this is an active RMPP MAD
1820 */
1821 mad_agent_priv->agent.recv_handler(
1822 &mad_agent_priv->agent, NULL,
1823 mad_recv_wc);
1824 deref_mad_agent(mad_agent_priv);
1825 } else {
1826 /* not user rmpp, revert to normal behavior and
1827 * drop the mad
1828 */
1829 ib_free_recv_mad(mad_recv_wc);
1830 deref_mad_agent(mad_agent_priv);
1831 return;
1832 }
1833 } else {
1834 ib_mark_mad_done(mad_send_wr);
1835 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1836
1837 /* Defined behavior is to complete response before request */
1838 mad_agent_priv->agent.recv_handler(
1839 &mad_agent_priv->agent,
1840 &mad_send_wr->send_buf,
1841 mad_recv_wc);
1842 deref_mad_agent(mad_agent_priv);
1843
1844 mad_send_wc.status = IB_WC_SUCCESS;
1845 mad_send_wc.vendor_err = 0;
1846 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1847 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1848 }
1849 } else {
1850 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
1851 mad_recv_wc);
1852 deref_mad_agent(mad_agent_priv);
1853 }
1854}
1855
1856static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
1857 const struct ib_mad_qp_info *qp_info,
1858 const struct ib_wc *wc,
1859 u32 port_num,
1860 struct ib_mad_private *recv,
1861 struct ib_mad_private *response)
1862{
1863 enum smi_forward_action retsmi;
1864 struct ib_smp *smp = (struct ib_smp *)recv->mad;
1865
1866 trace_ib_mad_handle_ib_smi(smp);
1867
1868 if (smi_handle_dr_smp_recv(smp,
1869 rdma_cap_ib_switch(port_priv->device),
1870 port_num,
1871 port_priv->device->phys_port_cnt) ==
1872 IB_SMI_DISCARD)
1873 return IB_SMI_DISCARD;
1874
1875 retsmi = smi_check_forward_dr_smp(smp);
1876 if (retsmi == IB_SMI_LOCAL)
1877 return IB_SMI_HANDLE;
1878
1879 if (retsmi == IB_SMI_SEND) { /* don't forward */
1880 if (smi_handle_dr_smp_send(smp,
1881 rdma_cap_ib_switch(port_priv->device),
1882 port_num) == IB_SMI_DISCARD)
1883 return IB_SMI_DISCARD;
1884
1885 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
1886 return IB_SMI_DISCARD;
1887 } else if (rdma_cap_ib_switch(port_priv->device)) {
1888 /* forward case for switches */
1889 memcpy(response, recv, mad_priv_size(response));
1890 response->header.recv_wc.wc = &response->header.wc;
1891 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1892 response->header.recv_wc.recv_buf.grh = &response->grh;
1893
1894 agent_send_response((const struct ib_mad_hdr *)response->mad,
1895 &response->grh, wc,
1896 port_priv->device,
1897 smi_get_fwd_port(smp),
1898 qp_info->qp->qp_num,
1899 response->mad_size,
1900 false);
1901
1902 return IB_SMI_DISCARD;
1903 }
1904 return IB_SMI_HANDLE;
1905}
1906
1907static bool generate_unmatched_resp(const struct ib_mad_private *recv,
1908 struct ib_mad_private *response,
1909 size_t *resp_len, bool opa)
1910{
1911 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
1912 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
1913
1914 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
1915 recv_hdr->method == IB_MGMT_METHOD_SET) {
1916 memcpy(response, recv, mad_priv_size(response));
1917 response->header.recv_wc.wc = &response->header.wc;
1918 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1919 response->header.recv_wc.recv_buf.grh = &response->grh;
1920 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
1921 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1922 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1923 resp_hdr->status |= IB_SMP_DIRECTION;
1924
1925 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
1926 if (recv_hdr->mgmt_class ==
1927 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
1928 recv_hdr->mgmt_class ==
1929 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1930 *resp_len = opa_get_smp_header_size(
1931 (struct opa_smp *)recv->mad);
1932 else
1933 *resp_len = sizeof(struct ib_mad_hdr);
1934 }
1935
1936 return true;
1937 } else {
1938 return false;
1939 }
1940}
1941
1942static enum smi_action
1943handle_opa_smi(struct ib_mad_port_private *port_priv,
1944 struct ib_mad_qp_info *qp_info,
1945 struct ib_wc *wc,
1946 u32 port_num,
1947 struct ib_mad_private *recv,
1948 struct ib_mad_private *response)
1949{
1950 enum smi_forward_action retsmi;
1951 struct opa_smp *smp = (struct opa_smp *)recv->mad;
1952
1953 trace_ib_mad_handle_opa_smi(smp);
1954
1955 if (opa_smi_handle_dr_smp_recv(smp,
1956 rdma_cap_ib_switch(port_priv->device),
1957 port_num,
1958 port_priv->device->phys_port_cnt) ==
1959 IB_SMI_DISCARD)
1960 return IB_SMI_DISCARD;
1961
1962 retsmi = opa_smi_check_forward_dr_smp(smp);
1963 if (retsmi == IB_SMI_LOCAL)
1964 return IB_SMI_HANDLE;
1965
1966 if (retsmi == IB_SMI_SEND) { /* don't forward */
1967 if (opa_smi_handle_dr_smp_send(smp,
1968 rdma_cap_ib_switch(port_priv->device),
1969 port_num) == IB_SMI_DISCARD)
1970 return IB_SMI_DISCARD;
1971
1972 if (opa_smi_check_local_smp(smp, port_priv->device) ==
1973 IB_SMI_DISCARD)
1974 return IB_SMI_DISCARD;
1975
1976 } else if (rdma_cap_ib_switch(port_priv->device)) {
1977 /* forward case for switches */
1978 memcpy(response, recv, mad_priv_size(response));
1979 response->header.recv_wc.wc = &response->header.wc;
1980 response->header.recv_wc.recv_buf.opa_mad =
1981 (struct opa_mad *)response->mad;
1982 response->header.recv_wc.recv_buf.grh = &response->grh;
1983
1984 agent_send_response((const struct ib_mad_hdr *)response->mad,
1985 &response->grh, wc,
1986 port_priv->device,
1987 opa_smi_get_fwd_port(smp),
1988 qp_info->qp->qp_num,
1989 recv->header.wc.byte_len,
1990 true);
1991
1992 return IB_SMI_DISCARD;
1993 }
1994
1995 return IB_SMI_HANDLE;
1996}
1997
1998static enum smi_action
1999handle_smi(struct ib_mad_port_private *port_priv,
2000 struct ib_mad_qp_info *qp_info,
2001 struct ib_wc *wc,
2002 u32 port_num,
2003 struct ib_mad_private *recv,
2004 struct ib_mad_private *response,
2005 bool opa)
2006{
2007 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2008
2009 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2010 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2011 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2012 response);
2013
2014 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2015}
2016
2017static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2018{
2019 struct ib_mad_port_private *port_priv = cq->cq_context;
2020 struct ib_mad_list_head *mad_list =
2021 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2022 struct ib_mad_qp_info *qp_info;
2023 struct ib_mad_private_header *mad_priv_hdr;
2024 struct ib_mad_private *recv, *response = NULL;
2025 struct ib_mad_agent_private *mad_agent;
2026 u32 port_num;
2027 int ret = IB_MAD_RESULT_SUCCESS;
2028 size_t mad_size;
2029 u16 resp_mad_pkey_index = 0;
2030 bool opa;
2031
2032 if (list_empty_careful(&port_priv->port_list))
2033 return;
2034
2035 if (wc->status != IB_WC_SUCCESS) {
2036 /*
2037 * Receive errors indicate that the QP has entered the error
2038 * state - error handling/shutdown code will cleanup
2039 */
2040 return;
2041 }
2042
2043 qp_info = mad_list->mad_queue->qp_info;
2044 dequeue_mad(mad_list);
2045
2046 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2047 qp_info->port_priv->port_num);
2048
2049 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2050 mad_list);
2051 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2052 ib_dma_unmap_single(port_priv->device,
2053 recv->header.mapping,
2054 mad_priv_dma_size(recv),
2055 DMA_FROM_DEVICE);
2056
2057 /* Setup MAD receive work completion from "normal" work completion */
2058 recv->header.wc = *wc;
2059 recv->header.recv_wc.wc = &recv->header.wc;
2060
2061 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2062 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2063 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2064 } else {
2065 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2066 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2067 }
2068
2069 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2070 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2071
2072 /* Validate MAD */
2073 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2074 goto out;
2075
2076 trace_ib_mad_recv_done_handler(qp_info, wc,
2077 (struct ib_mad_hdr *)recv->mad);
2078
2079 mad_size = recv->mad_size;
2080 response = alloc_mad_private(mad_size, GFP_KERNEL);
2081 if (!response)
2082 goto out;
2083
2084 if (rdma_cap_ib_switch(port_priv->device))
2085 port_num = wc->port_num;
2086 else
2087 port_num = port_priv->port_num;
2088
2089 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2090 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2091 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2092 response, opa)
2093 == IB_SMI_DISCARD)
2094 goto out;
2095 }
2096
2097 /* Give driver "right of first refusal" on incoming MAD */
2098 if (port_priv->device->ops.process_mad) {
2099 ret = port_priv->device->ops.process_mad(
2100 port_priv->device, 0, port_priv->port_num, wc,
2101 &recv->grh, (const struct ib_mad *)recv->mad,
2102 (struct ib_mad *)response->mad, &mad_size,
2103 &resp_mad_pkey_index);
2104
2105 if (opa)
2106 wc->pkey_index = resp_mad_pkey_index;
2107
2108 if (ret & IB_MAD_RESULT_SUCCESS) {
2109 if (ret & IB_MAD_RESULT_CONSUMED)
2110 goto out;
2111 if (ret & IB_MAD_RESULT_REPLY) {
2112 agent_send_response((const struct ib_mad_hdr *)response->mad,
2113 &recv->grh, wc,
2114 port_priv->device,
2115 port_num,
2116 qp_info->qp->qp_num,
2117 mad_size, opa);
2118 goto out;
2119 }
2120 }
2121 }
2122
2123 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2124 if (mad_agent) {
2125 trace_ib_mad_recv_done_agent(mad_agent);
2126 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2127 /*
2128 * recv is freed up in error cases in ib_mad_complete_recv
2129 * or via recv_handler in ib_mad_complete_recv()
2130 */
2131 recv = NULL;
2132 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2133 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2134 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2135 port_priv->device, port_num,
2136 qp_info->qp->qp_num, mad_size, opa);
2137 }
2138
2139out:
2140 /* Post another receive request for this QP */
2141 if (response) {
2142 ib_mad_post_receive_mads(qp_info, response);
2143 kfree(recv);
2144 } else
2145 ib_mad_post_receive_mads(qp_info, recv);
2146}
2147
2148static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2149{
2150 struct ib_mad_send_wr_private *mad_send_wr;
2151 unsigned long delay;
2152
2153 if (list_empty(&mad_agent_priv->wait_list)) {
2154 cancel_delayed_work(&mad_agent_priv->timed_work);
2155 } else {
2156 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2157 struct ib_mad_send_wr_private,
2158 agent_list);
2159
2160 if (time_after(mad_agent_priv->timeout,
2161 mad_send_wr->timeout)) {
2162 mad_agent_priv->timeout = mad_send_wr->timeout;
2163 delay = mad_send_wr->timeout - jiffies;
2164 if ((long)delay <= 0)
2165 delay = 1;
2166 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2167 &mad_agent_priv->timed_work, delay);
2168 }
2169 }
2170}
2171
2172static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2173{
2174 struct ib_mad_agent_private *mad_agent_priv;
2175 struct ib_mad_send_wr_private *temp_mad_send_wr;
2176 struct list_head *list_item;
2177 unsigned long delay;
2178
2179 mad_agent_priv = mad_send_wr->mad_agent_priv;
2180 list_del(&mad_send_wr->agent_list);
2181
2182 delay = mad_send_wr->timeout;
2183 mad_send_wr->timeout += jiffies;
2184
2185 if (delay) {
2186 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2187 temp_mad_send_wr = list_entry(list_item,
2188 struct ib_mad_send_wr_private,
2189 agent_list);
2190 if (time_after(mad_send_wr->timeout,
2191 temp_mad_send_wr->timeout))
2192 break;
2193 }
2194 } else {
2195 list_item = &mad_agent_priv->wait_list;
2196 }
2197
2198 list_add(&mad_send_wr->agent_list, list_item);
2199
2200 /* Reschedule a work item if we have a shorter timeout */
2201 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2202 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2203 &mad_agent_priv->timed_work, delay);
2204}
2205
2206void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2207 unsigned long timeout_ms)
2208{
2209 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2210 wait_for_response(mad_send_wr);
2211}
2212
2213/*
2214 * Process a send work completion
2215 */
2216void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2217 struct ib_mad_send_wc *mad_send_wc)
2218{
2219 struct ib_mad_agent_private *mad_agent_priv;
2220 unsigned long flags;
2221 int ret;
2222
2223 mad_agent_priv = mad_send_wr->mad_agent_priv;
2224 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2225 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2226 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2227 if (ret == IB_RMPP_RESULT_CONSUMED)
2228 goto done;
2229 } else
2230 ret = IB_RMPP_RESULT_UNHANDLED;
2231
2232 if (mad_send_wc->status != IB_WC_SUCCESS &&
2233 mad_send_wr->status == IB_WC_SUCCESS) {
2234 mad_send_wr->status = mad_send_wc->status;
2235 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2236 }
2237
2238 if (--mad_send_wr->refcount > 0) {
2239 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2240 mad_send_wr->status == IB_WC_SUCCESS) {
2241 wait_for_response(mad_send_wr);
2242 }
2243 goto done;
2244 }
2245
2246 /* Remove send from MAD agent and notify client of completion */
2247 list_del(&mad_send_wr->agent_list);
2248 adjust_timeout(mad_agent_priv);
2249 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2250
2251 if (mad_send_wr->status != IB_WC_SUCCESS)
2252 mad_send_wc->status = mad_send_wr->status;
2253 if (ret == IB_RMPP_RESULT_INTERNAL)
2254 ib_rmpp_send_handler(mad_send_wc);
2255 else
2256 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2257 mad_send_wc);
2258
2259 /* Release reference on agent taken when sending */
2260 deref_mad_agent(mad_agent_priv);
2261 return;
2262done:
2263 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2264}
2265
2266static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2267{
2268 struct ib_mad_port_private *port_priv = cq->cq_context;
2269 struct ib_mad_list_head *mad_list =
2270 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2271 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2272 struct ib_mad_qp_info *qp_info;
2273 struct ib_mad_queue *send_queue;
2274 struct ib_mad_send_wc mad_send_wc;
2275 unsigned long flags;
2276 int ret;
2277
2278 if (list_empty_careful(&port_priv->port_list))
2279 return;
2280
2281 if (wc->status != IB_WC_SUCCESS) {
2282 if (!ib_mad_send_error(port_priv, wc))
2283 return;
2284 }
2285
2286 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2287 mad_list);
2288 send_queue = mad_list->mad_queue;
2289 qp_info = send_queue->qp_info;
2290
2291 trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
2292 trace_ib_mad_send_done_handler(mad_send_wr, wc);
2293
2294retry:
2295 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2296 mad_send_wr->header_mapping,
2297 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2298 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2299 mad_send_wr->payload_mapping,
2300 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2301 queued_send_wr = NULL;
2302 spin_lock_irqsave(&send_queue->lock, flags);
2303 list_del(&mad_list->list);
2304
2305 /* Move queued send to the send queue */
2306 if (send_queue->count-- > send_queue->max_active) {
2307 mad_list = container_of(qp_info->overflow_list.next,
2308 struct ib_mad_list_head, list);
2309 queued_send_wr = container_of(mad_list,
2310 struct ib_mad_send_wr_private,
2311 mad_list);
2312 list_move_tail(&mad_list->list, &send_queue->list);
2313 }
2314 spin_unlock_irqrestore(&send_queue->lock, flags);
2315
2316 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2317 mad_send_wc.status = wc->status;
2318 mad_send_wc.vendor_err = wc->vendor_err;
2319 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2320
2321 if (queued_send_wr) {
2322 trace_ib_mad_send_done_resend(queued_send_wr, qp_info);
2323 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2324 NULL);
2325 if (ret) {
2326 dev_err(&port_priv->device->dev,
2327 "ib_post_send failed: %d\n", ret);
2328 mad_send_wr = queued_send_wr;
2329 wc->status = IB_WC_LOC_QP_OP_ERR;
2330 goto retry;
2331 }
2332 }
2333}
2334
2335static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2336{
2337 struct ib_mad_send_wr_private *mad_send_wr;
2338 struct ib_mad_list_head *mad_list;
2339 unsigned long flags;
2340
2341 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2342 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2343 mad_send_wr = container_of(mad_list,
2344 struct ib_mad_send_wr_private,
2345 mad_list);
2346 mad_send_wr->retry = 1;
2347 }
2348 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2349}
2350
2351static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2352 struct ib_wc *wc)
2353{
2354 struct ib_mad_list_head *mad_list =
2355 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2356 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2357 struct ib_mad_send_wr_private *mad_send_wr;
2358 int ret;
2359
2360 /*
2361 * Send errors will transition the QP to SQE - move
2362 * QP to RTS and repost flushed work requests
2363 */
2364 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2365 mad_list);
2366 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2367 if (mad_send_wr->retry) {
2368 /* Repost send */
2369 mad_send_wr->retry = 0;
2370 trace_ib_mad_error_handler(mad_send_wr, qp_info);
2371 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2372 NULL);
2373 if (!ret)
2374 return false;
2375 }
2376 } else {
2377 struct ib_qp_attr *attr;
2378
2379 /* Transition QP to RTS and fail offending send */
2380 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2381 if (attr) {
2382 attr->qp_state = IB_QPS_RTS;
2383 attr->cur_qp_state = IB_QPS_SQE;
2384 ret = ib_modify_qp(qp_info->qp, attr,
2385 IB_QP_STATE | IB_QP_CUR_STATE);
2386 kfree(attr);
2387 if (ret)
2388 dev_err(&port_priv->device->dev,
2389 "%s - ib_modify_qp to RTS: %d\n",
2390 __func__, ret);
2391 else
2392 mark_sends_for_retry(qp_info);
2393 }
2394 }
2395
2396 return true;
2397}
2398
2399static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2400{
2401 unsigned long flags;
2402 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2403 struct ib_mad_send_wc mad_send_wc;
2404 struct list_head cancel_list;
2405
2406 INIT_LIST_HEAD(&cancel_list);
2407
2408 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2409 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2410 &mad_agent_priv->send_list, agent_list) {
2411 if (mad_send_wr->status == IB_WC_SUCCESS) {
2412 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2413 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2414 }
2415 }
2416
2417 /* Empty wait list to prevent receives from finding a request */
2418 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2419 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2420
2421 /* Report all cancelled requests */
2422 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2423 mad_send_wc.vendor_err = 0;
2424
2425 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2426 &cancel_list, agent_list) {
2427 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2428 list_del(&mad_send_wr->agent_list);
2429 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2430 &mad_send_wc);
2431 deref_mad_agent(mad_agent_priv);
2432 }
2433}
2434
2435static struct ib_mad_send_wr_private*
2436find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2437 struct ib_mad_send_buf *send_buf)
2438{
2439 struct ib_mad_send_wr_private *mad_send_wr;
2440
2441 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2442 agent_list) {
2443 if (&mad_send_wr->send_buf == send_buf)
2444 return mad_send_wr;
2445 }
2446
2447 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2448 agent_list) {
2449 if (is_rmpp_data_mad(mad_agent_priv,
2450 mad_send_wr->send_buf.mad) &&
2451 &mad_send_wr->send_buf == send_buf)
2452 return mad_send_wr;
2453 }
2454 return NULL;
2455}
2456
2457int ib_modify_mad(struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2458{
2459 struct ib_mad_agent_private *mad_agent_priv;
2460 struct ib_mad_send_wr_private *mad_send_wr;
2461 unsigned long flags;
2462 int active;
2463
2464 if (!send_buf)
2465 return -EINVAL;
2466
2467 mad_agent_priv = container_of(send_buf->mad_agent,
2468 struct ib_mad_agent_private, agent);
2469 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2470 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2471 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2472 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2473 return -EINVAL;
2474 }
2475
2476 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2477 if (!timeout_ms) {
2478 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2479 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2480 }
2481
2482 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2483 if (active)
2484 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2485 else
2486 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2487
2488 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2489 return 0;
2490}
2491EXPORT_SYMBOL(ib_modify_mad);
2492
2493static void local_completions(struct work_struct *work)
2494{
2495 struct ib_mad_agent_private *mad_agent_priv;
2496 struct ib_mad_local_private *local;
2497 struct ib_mad_agent_private *recv_mad_agent;
2498 unsigned long flags;
2499 int free_mad;
2500 struct ib_wc wc;
2501 struct ib_mad_send_wc mad_send_wc;
2502 bool opa;
2503
2504 mad_agent_priv =
2505 container_of(work, struct ib_mad_agent_private, local_work);
2506
2507 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2508 mad_agent_priv->qp_info->port_priv->port_num);
2509
2510 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2511 while (!list_empty(&mad_agent_priv->local_list)) {
2512 local = list_entry(mad_agent_priv->local_list.next,
2513 struct ib_mad_local_private,
2514 completion_list);
2515 list_del(&local->completion_list);
2516 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2517 free_mad = 0;
2518 if (local->mad_priv) {
2519 u8 base_version;
2520 recv_mad_agent = local->recv_mad_agent;
2521 if (!recv_mad_agent) {
2522 dev_err(&mad_agent_priv->agent.device->dev,
2523 "No receive MAD agent for local completion\n");
2524 free_mad = 1;
2525 goto local_send_completion;
2526 }
2527
2528 /*
2529 * Defined behavior is to complete response
2530 * before request
2531 */
2532 build_smp_wc(recv_mad_agent->agent.qp,
2533 local->mad_send_wr->send_wr.wr.wr_cqe,
2534 be16_to_cpu(IB_LID_PERMISSIVE),
2535 local->mad_send_wr->send_wr.pkey_index,
2536 recv_mad_agent->agent.port_num, &wc);
2537
2538 local->mad_priv->header.recv_wc.wc = &wc;
2539
2540 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2541 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2542 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2543 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2544 } else {
2545 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2546 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2547 }
2548
2549 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2550 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2551 &local->mad_priv->header.recv_wc.rmpp_list);
2552 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2553 local->mad_priv->header.recv_wc.recv_buf.mad =
2554 (struct ib_mad *)local->mad_priv->mad;
2555 recv_mad_agent->agent.recv_handler(
2556 &recv_mad_agent->agent,
2557 &local->mad_send_wr->send_buf,
2558 &local->mad_priv->header.recv_wc);
2559 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2560 deref_mad_agent(recv_mad_agent);
2561 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2562 }
2563
2564local_send_completion:
2565 /* Complete send */
2566 mad_send_wc.status = IB_WC_SUCCESS;
2567 mad_send_wc.vendor_err = 0;
2568 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2569 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2570 &mad_send_wc);
2571
2572 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2573 deref_mad_agent(mad_agent_priv);
2574 if (free_mad)
2575 kfree(local->mad_priv);
2576 kfree(local);
2577 }
2578 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2579}
2580
2581static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2582{
2583 int ret;
2584
2585 if (!mad_send_wr->retries_left)
2586 return -ETIMEDOUT;
2587
2588 mad_send_wr->retries_left--;
2589 mad_send_wr->send_buf.retries++;
2590
2591 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2592
2593 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2594 ret = ib_retry_rmpp(mad_send_wr);
2595 switch (ret) {
2596 case IB_RMPP_RESULT_UNHANDLED:
2597 ret = ib_send_mad(mad_send_wr);
2598 break;
2599 case IB_RMPP_RESULT_CONSUMED:
2600 ret = 0;
2601 break;
2602 default:
2603 ret = -ECOMM;
2604 break;
2605 }
2606 } else
2607 ret = ib_send_mad(mad_send_wr);
2608
2609 if (!ret) {
2610 mad_send_wr->refcount++;
2611 list_add_tail(&mad_send_wr->agent_list,
2612 &mad_send_wr->mad_agent_priv->send_list);
2613 }
2614 return ret;
2615}
2616
2617static void timeout_sends(struct work_struct *work)
2618{
2619 struct ib_mad_agent_private *mad_agent_priv;
2620 struct ib_mad_send_wr_private *mad_send_wr;
2621 struct ib_mad_send_wc mad_send_wc;
2622 unsigned long flags, delay;
2623
2624 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2625 timed_work.work);
2626 mad_send_wc.vendor_err = 0;
2627
2628 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2629 while (!list_empty(&mad_agent_priv->wait_list)) {
2630 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2631 struct ib_mad_send_wr_private,
2632 agent_list);
2633
2634 if (time_after(mad_send_wr->timeout, jiffies)) {
2635 delay = mad_send_wr->timeout - jiffies;
2636 if ((long)delay <= 0)
2637 delay = 1;
2638 queue_delayed_work(mad_agent_priv->qp_info->
2639 port_priv->wq,
2640 &mad_agent_priv->timed_work, delay);
2641 break;
2642 }
2643
2644 list_del(&mad_send_wr->agent_list);
2645 if (mad_send_wr->status == IB_WC_SUCCESS &&
2646 !retry_send(mad_send_wr))
2647 continue;
2648
2649 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2650
2651 if (mad_send_wr->status == IB_WC_SUCCESS)
2652 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2653 else
2654 mad_send_wc.status = mad_send_wr->status;
2655 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2656 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2657 &mad_send_wc);
2658
2659 deref_mad_agent(mad_agent_priv);
2660 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2661 }
2662 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2663}
2664
2665/*
2666 * Allocate receive MADs and post receive WRs for them
2667 */
2668static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2669 struct ib_mad_private *mad)
2670{
2671 unsigned long flags;
2672 int post, ret;
2673 struct ib_mad_private *mad_priv;
2674 struct ib_sge sg_list;
2675 struct ib_recv_wr recv_wr;
2676 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2677
2678 /* Initialize common scatter list fields */
2679 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2680
2681 /* Initialize common receive WR fields */
2682 recv_wr.next = NULL;
2683 recv_wr.sg_list = &sg_list;
2684 recv_wr.num_sge = 1;
2685
2686 do {
2687 /* Allocate and map receive buffer */
2688 if (mad) {
2689 mad_priv = mad;
2690 mad = NULL;
2691 } else {
2692 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2693 GFP_ATOMIC);
2694 if (!mad_priv) {
2695 ret = -ENOMEM;
2696 break;
2697 }
2698 }
2699 sg_list.length = mad_priv_dma_size(mad_priv);
2700 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2701 &mad_priv->grh,
2702 mad_priv_dma_size(mad_priv),
2703 DMA_FROM_DEVICE);
2704 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2705 sg_list.addr))) {
2706 kfree(mad_priv);
2707 ret = -ENOMEM;
2708 break;
2709 }
2710 mad_priv->header.mapping = sg_list.addr;
2711 mad_priv->header.mad_list.mad_queue = recv_queue;
2712 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2713 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2714
2715 /* Post receive WR */
2716 spin_lock_irqsave(&recv_queue->lock, flags);
2717 post = (++recv_queue->count < recv_queue->max_active);
2718 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2719 spin_unlock_irqrestore(&recv_queue->lock, flags);
2720 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
2721 if (ret) {
2722 spin_lock_irqsave(&recv_queue->lock, flags);
2723 list_del(&mad_priv->header.mad_list.list);
2724 recv_queue->count--;
2725 spin_unlock_irqrestore(&recv_queue->lock, flags);
2726 ib_dma_unmap_single(qp_info->port_priv->device,
2727 mad_priv->header.mapping,
2728 mad_priv_dma_size(mad_priv),
2729 DMA_FROM_DEVICE);
2730 kfree(mad_priv);
2731 dev_err(&qp_info->port_priv->device->dev,
2732 "ib_post_recv failed: %d\n", ret);
2733 break;
2734 }
2735 } while (post);
2736
2737 return ret;
2738}
2739
2740/*
2741 * Return all the posted receive MADs
2742 */
2743static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2744{
2745 struct ib_mad_private_header *mad_priv_hdr;
2746 struct ib_mad_private *recv;
2747 struct ib_mad_list_head *mad_list;
2748
2749 if (!qp_info->qp)
2750 return;
2751
2752 while (!list_empty(&qp_info->recv_queue.list)) {
2753
2754 mad_list = list_entry(qp_info->recv_queue.list.next,
2755 struct ib_mad_list_head, list);
2756 mad_priv_hdr = container_of(mad_list,
2757 struct ib_mad_private_header,
2758 mad_list);
2759 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2760 header);
2761
2762 /* Remove from posted receive MAD list */
2763 list_del(&mad_list->list);
2764
2765 ib_dma_unmap_single(qp_info->port_priv->device,
2766 recv->header.mapping,
2767 mad_priv_dma_size(recv),
2768 DMA_FROM_DEVICE);
2769 kfree(recv);
2770 }
2771
2772 qp_info->recv_queue.count = 0;
2773}
2774
2775/*
2776 * Start the port
2777 */
2778static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2779{
2780 int ret, i;
2781 struct ib_qp_attr *attr;
2782 struct ib_qp *qp;
2783 u16 pkey_index;
2784
2785 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2786 if (!attr)
2787 return -ENOMEM;
2788
2789 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2790 IB_DEFAULT_PKEY_FULL, &pkey_index);
2791 if (ret)
2792 pkey_index = 0;
2793
2794 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2795 qp = port_priv->qp_info[i].qp;
2796 if (!qp)
2797 continue;
2798
2799 /*
2800 * PKey index for QP1 is irrelevant but
2801 * one is needed for the Reset to Init transition
2802 */
2803 attr->qp_state = IB_QPS_INIT;
2804 attr->pkey_index = pkey_index;
2805 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2806 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2807 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2808 if (ret) {
2809 dev_err(&port_priv->device->dev,
2810 "Couldn't change QP%d state to INIT: %d\n",
2811 i, ret);
2812 goto out;
2813 }
2814
2815 attr->qp_state = IB_QPS_RTR;
2816 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2817 if (ret) {
2818 dev_err(&port_priv->device->dev,
2819 "Couldn't change QP%d state to RTR: %d\n",
2820 i, ret);
2821 goto out;
2822 }
2823
2824 attr->qp_state = IB_QPS_RTS;
2825 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2826 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2827 if (ret) {
2828 dev_err(&port_priv->device->dev,
2829 "Couldn't change QP%d state to RTS: %d\n",
2830 i, ret);
2831 goto out;
2832 }
2833 }
2834
2835 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2836 if (ret) {
2837 dev_err(&port_priv->device->dev,
2838 "Failed to request completion notification: %d\n",
2839 ret);
2840 goto out;
2841 }
2842
2843 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2844 if (!port_priv->qp_info[i].qp)
2845 continue;
2846
2847 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2848 if (ret) {
2849 dev_err(&port_priv->device->dev,
2850 "Couldn't post receive WRs\n");
2851 goto out;
2852 }
2853 }
2854out:
2855 kfree(attr);
2856 return ret;
2857}
2858
2859static void qp_event_handler(struct ib_event *event, void *qp_context)
2860{
2861 struct ib_mad_qp_info *qp_info = qp_context;
2862
2863 /* It's worse than that! He's dead, Jim! */
2864 dev_err(&qp_info->port_priv->device->dev,
2865 "Fatal error (%d) on MAD QP (%u)\n",
2866 event->event, qp_info->qp->qp_num);
2867}
2868
2869static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2870 struct ib_mad_queue *mad_queue)
2871{
2872 mad_queue->qp_info = qp_info;
2873 mad_queue->count = 0;
2874 spin_lock_init(&mad_queue->lock);
2875 INIT_LIST_HEAD(&mad_queue->list);
2876}
2877
2878static void init_mad_qp(struct ib_mad_port_private *port_priv,
2879 struct ib_mad_qp_info *qp_info)
2880{
2881 qp_info->port_priv = port_priv;
2882 init_mad_queue(qp_info, &qp_info->send_queue);
2883 init_mad_queue(qp_info, &qp_info->recv_queue);
2884 INIT_LIST_HEAD(&qp_info->overflow_list);
2885}
2886
2887static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2888 enum ib_qp_type qp_type)
2889{
2890 struct ib_qp_init_attr qp_init_attr;
2891 int ret;
2892
2893 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2894 qp_init_attr.send_cq = qp_info->port_priv->cq;
2895 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2896 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2897 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2898 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2899 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2900 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2901 qp_init_attr.qp_type = qp_type;
2902 qp_init_attr.port_num = qp_info->port_priv->port_num;
2903 qp_init_attr.qp_context = qp_info;
2904 qp_init_attr.event_handler = qp_event_handler;
2905 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2906 if (IS_ERR(qp_info->qp)) {
2907 dev_err(&qp_info->port_priv->device->dev,
2908 "Couldn't create ib_mad QP%d\n",
2909 get_spl_qp_index(qp_type));
2910 ret = PTR_ERR(qp_info->qp);
2911 goto error;
2912 }
2913 /* Use minimum queue sizes unless the CQ is resized */
2914 qp_info->send_queue.max_active = mad_sendq_size;
2915 qp_info->recv_queue.max_active = mad_recvq_size;
2916 return 0;
2917
2918error:
2919 return ret;
2920}
2921
2922static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2923{
2924 if (!qp_info->qp)
2925 return;
2926
2927 ib_destroy_qp(qp_info->qp);
2928}
2929
2930/*
2931 * Open the port
2932 * Create the QP, PD, MR, and CQ if needed
2933 */
2934static int ib_mad_port_open(struct ib_device *device,
2935 u32 port_num)
2936{
2937 int ret, cq_size;
2938 struct ib_mad_port_private *port_priv;
2939 unsigned long flags;
2940 char name[sizeof "ib_mad123"];
2941 int has_smi;
2942
2943 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
2944 return -EFAULT;
2945
2946 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
2947 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
2948 return -EFAULT;
2949
2950 /* Create new device info */
2951 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2952 if (!port_priv)
2953 return -ENOMEM;
2954
2955 port_priv->device = device;
2956 port_priv->port_num = port_num;
2957 spin_lock_init(&port_priv->reg_lock);
2958 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2959 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2960
2961 cq_size = mad_sendq_size + mad_recvq_size;
2962 has_smi = rdma_cap_ib_smi(device, port_num);
2963 if (has_smi)
2964 cq_size *= 2;
2965
2966 port_priv->pd = ib_alloc_pd(device, 0);
2967 if (IS_ERR(port_priv->pd)) {
2968 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2969 ret = PTR_ERR(port_priv->pd);
2970 goto error3;
2971 }
2972
2973 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
2974 IB_POLL_UNBOUND_WORKQUEUE);
2975 if (IS_ERR(port_priv->cq)) {
2976 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2977 ret = PTR_ERR(port_priv->cq);
2978 goto error4;
2979 }
2980
2981 if (has_smi) {
2982 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2983 if (ret)
2984 goto error6;
2985 }
2986 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2987 if (ret)
2988 goto error7;
2989
2990 snprintf(name, sizeof(name), "ib_mad%u", port_num);
2991 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
2992 if (!port_priv->wq) {
2993 ret = -ENOMEM;
2994 goto error8;
2995 }
2996
2997 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2998 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2999 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3000
3001 ret = ib_mad_port_start(port_priv);
3002 if (ret) {
3003 dev_err(&device->dev, "Couldn't start port\n");
3004 goto error9;
3005 }
3006
3007 return 0;
3008
3009error9:
3010 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3011 list_del_init(&port_priv->port_list);
3012 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3013
3014 destroy_workqueue(port_priv->wq);
3015error8:
3016 destroy_mad_qp(&port_priv->qp_info[1]);
3017error7:
3018 destroy_mad_qp(&port_priv->qp_info[0]);
3019error6:
3020 ib_free_cq(port_priv->cq);
3021 cleanup_recv_queue(&port_priv->qp_info[1]);
3022 cleanup_recv_queue(&port_priv->qp_info[0]);
3023error4:
3024 ib_dealloc_pd(port_priv->pd);
3025error3:
3026 kfree(port_priv);
3027
3028 return ret;
3029}
3030
3031/*
3032 * Close the port
3033 * If there are no classes using the port, free the port
3034 * resources (CQ, MR, PD, QP) and remove the port's info structure
3035 */
3036static int ib_mad_port_close(struct ib_device *device, u32 port_num)
3037{
3038 struct ib_mad_port_private *port_priv;
3039 unsigned long flags;
3040
3041 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3042 port_priv = __ib_get_mad_port(device, port_num);
3043 if (port_priv == NULL) {
3044 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3045 dev_err(&device->dev, "Port %u not found\n", port_num);
3046 return -ENODEV;
3047 }
3048 list_del_init(&port_priv->port_list);
3049 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3050
3051 destroy_workqueue(port_priv->wq);
3052 destroy_mad_qp(&port_priv->qp_info[1]);
3053 destroy_mad_qp(&port_priv->qp_info[0]);
3054 ib_free_cq(port_priv->cq);
3055 ib_dealloc_pd(port_priv->pd);
3056 cleanup_recv_queue(&port_priv->qp_info[1]);
3057 cleanup_recv_queue(&port_priv->qp_info[0]);
3058 /* XXX: Handle deallocation of MAD registration tables */
3059
3060 kfree(port_priv);
3061
3062 return 0;
3063}
3064
3065static int ib_mad_init_device(struct ib_device *device)
3066{
3067 int start, i;
3068 unsigned int count = 0;
3069 int ret;
3070
3071 start = rdma_start_port(device);
3072
3073 for (i = start; i <= rdma_end_port(device); i++) {
3074 if (!rdma_cap_ib_mad(device, i))
3075 continue;
3076
3077 ret = ib_mad_port_open(device, i);
3078 if (ret) {
3079 dev_err(&device->dev, "Couldn't open port %d\n", i);
3080 goto error;
3081 }
3082 ret = ib_agent_port_open(device, i);
3083 if (ret) {
3084 dev_err(&device->dev,
3085 "Couldn't open port %d for agents\n", i);
3086 goto error_agent;
3087 }
3088 count++;
3089 }
3090 if (!count)
3091 return -EOPNOTSUPP;
3092
3093 return 0;
3094
3095error_agent:
3096 if (ib_mad_port_close(device, i))
3097 dev_err(&device->dev, "Couldn't close port %d\n", i);
3098
3099error:
3100 while (--i >= start) {
3101 if (!rdma_cap_ib_mad(device, i))
3102 continue;
3103
3104 if (ib_agent_port_close(device, i))
3105 dev_err(&device->dev,
3106 "Couldn't close port %d for agents\n", i);
3107 if (ib_mad_port_close(device, i))
3108 dev_err(&device->dev, "Couldn't close port %d\n", i);
3109 }
3110 return ret;
3111}
3112
3113static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3114{
3115 unsigned int i;
3116
3117 rdma_for_each_port (device, i) {
3118 if (!rdma_cap_ib_mad(device, i))
3119 continue;
3120
3121 if (ib_agent_port_close(device, i))
3122 dev_err(&device->dev,
3123 "Couldn't close port %u for agents\n", i);
3124 if (ib_mad_port_close(device, i))
3125 dev_err(&device->dev, "Couldn't close port %u\n", i);
3126 }
3127}
3128
3129static struct ib_client mad_client = {
3130 .name = "mad",
3131 .add = ib_mad_init_device,
3132 .remove = ib_mad_remove_device
3133};
3134
3135int ib_mad_init(void)
3136{
3137 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3138 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3139
3140 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3141 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3142
3143 INIT_LIST_HEAD(&ib_mad_port_list);
3144
3145 if (ib_register_client(&mad_client)) {
3146 pr_err("Couldn't register ib_mad client\n");
3147 return -EINVAL;
3148 }
3149
3150 return 0;
3151}
3152
3153void ib_mad_cleanup(void)
3154{
3155 ib_unregister_client(&mad_client);
3156}
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 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 <rdma/ib_cache.h>
45
46#include "mad_priv.h"
47#include "core_priv.h"
48#include "mad_rmpp.h"
49#include "smi.h"
50#include "opa_smi.h"
51#include "agent.h"
52
53static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
54static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
55
56module_param_named(send_queue_size, mad_sendq_size, int, 0444);
57MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
58module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
59MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
60
61static struct list_head ib_mad_port_list;
62static atomic_t ib_mad_client_id = ATOMIC_INIT(0);
63
64/* Port list lock */
65static DEFINE_SPINLOCK(ib_mad_port_list_lock);
66
67/* Forward declarations */
68static int method_in_use(struct ib_mad_mgmt_method_table **method,
69 struct ib_mad_reg_req *mad_reg_req);
70static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
71static struct ib_mad_agent_private *find_mad_agent(
72 struct ib_mad_port_private *port_priv,
73 const struct ib_mad_hdr *mad);
74static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
75 struct ib_mad_private *mad);
76static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
77static void timeout_sends(struct work_struct *work);
78static void local_completions(struct work_struct *work);
79static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
80 struct ib_mad_agent_private *agent_priv,
81 u8 mgmt_class);
82static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv);
84static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
85 struct ib_wc *wc);
86static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
87
88/*
89 * Returns a ib_mad_port_private structure or NULL for a device/port
90 * Assumes ib_mad_port_list_lock is being held
91 */
92static inline struct ib_mad_port_private *
93__ib_get_mad_port(struct ib_device *device, int port_num)
94{
95 struct ib_mad_port_private *entry;
96
97 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
98 if (entry->device == device && entry->port_num == port_num)
99 return entry;
100 }
101 return NULL;
102}
103
104/*
105 * Wrapper function to return a ib_mad_port_private structure or NULL
106 * for a device/port
107 */
108static inline struct ib_mad_port_private *
109ib_get_mad_port(struct ib_device *device, int port_num)
110{
111 struct ib_mad_port_private *entry;
112 unsigned long flags;
113
114 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
115 entry = __ib_get_mad_port(device, port_num);
116 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
117
118 return entry;
119}
120
121static inline u8 convert_mgmt_class(u8 mgmt_class)
122{
123 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
124 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
125 0 : mgmt_class;
126}
127
128static int get_spl_qp_index(enum ib_qp_type qp_type)
129{
130 switch (qp_type)
131 {
132 case IB_QPT_SMI:
133 return 0;
134 case IB_QPT_GSI:
135 return 1;
136 default:
137 return -1;
138 }
139}
140
141static int vendor_class_index(u8 mgmt_class)
142{
143 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
144}
145
146static int is_vendor_class(u8 mgmt_class)
147{
148 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
149 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
150 return 0;
151 return 1;
152}
153
154static int is_vendor_oui(char *oui)
155{
156 if (oui[0] || oui[1] || oui[2])
157 return 1;
158 return 0;
159}
160
161static int is_vendor_method_in_use(
162 struct ib_mad_mgmt_vendor_class *vendor_class,
163 struct ib_mad_reg_req *mad_reg_req)
164{
165 struct ib_mad_mgmt_method_table *method;
166 int i;
167
168 for (i = 0; i < MAX_MGMT_OUI; i++) {
169 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
170 method = vendor_class->method_table[i];
171 if (method) {
172 if (method_in_use(&method, mad_reg_req))
173 return 1;
174 else
175 break;
176 }
177 }
178 }
179 return 0;
180}
181
182int ib_response_mad(const struct ib_mad_hdr *hdr)
183{
184 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
185 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
186 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
187 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
188}
189EXPORT_SYMBOL(ib_response_mad);
190
191/*
192 * ib_register_mad_agent - Register to send/receive MADs
193 */
194struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
195 u8 port_num,
196 enum ib_qp_type qp_type,
197 struct ib_mad_reg_req *mad_reg_req,
198 u8 rmpp_version,
199 ib_mad_send_handler send_handler,
200 ib_mad_recv_handler recv_handler,
201 void *context,
202 u32 registration_flags)
203{
204 struct ib_mad_port_private *port_priv;
205 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
206 struct ib_mad_agent_private *mad_agent_priv;
207 struct ib_mad_reg_req *reg_req = NULL;
208 struct ib_mad_mgmt_class_table *class;
209 struct ib_mad_mgmt_vendor_class_table *vendor;
210 struct ib_mad_mgmt_vendor_class *vendor_class;
211 struct ib_mad_mgmt_method_table *method;
212 int ret2, qpn;
213 unsigned long flags;
214 u8 mgmt_class, vclass;
215
216 /* Validate parameters */
217 qpn = get_spl_qp_index(qp_type);
218 if (qpn == -1) {
219 dev_notice(&device->dev,
220 "ib_register_mad_agent: invalid QP Type %d\n",
221 qp_type);
222 goto error1;
223 }
224
225 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
226 dev_notice(&device->dev,
227 "ib_register_mad_agent: invalid RMPP Version %u\n",
228 rmpp_version);
229 goto error1;
230 }
231
232 /* Validate MAD registration request if supplied */
233 if (mad_reg_req) {
234 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
235 dev_notice(&device->dev,
236 "ib_register_mad_agent: invalid Class Version %u\n",
237 mad_reg_req->mgmt_class_version);
238 goto error1;
239 }
240 if (!recv_handler) {
241 dev_notice(&device->dev,
242 "ib_register_mad_agent: no recv_handler\n");
243 goto error1;
244 }
245 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
246 /*
247 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
248 * one in this range currently allowed
249 */
250 if (mad_reg_req->mgmt_class !=
251 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
252 dev_notice(&device->dev,
253 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
254 mad_reg_req->mgmt_class);
255 goto error1;
256 }
257 } else if (mad_reg_req->mgmt_class == 0) {
258 /*
259 * Class 0 is reserved in IBA and is used for
260 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
261 */
262 dev_notice(&device->dev,
263 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
264 goto error1;
265 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
266 /*
267 * If class is in "new" vendor range,
268 * ensure supplied OUI is not zero
269 */
270 if (!is_vendor_oui(mad_reg_req->oui)) {
271 dev_notice(&device->dev,
272 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
273 mad_reg_req->mgmt_class);
274 goto error1;
275 }
276 }
277 /* Make sure class supplied is consistent with RMPP */
278 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
279 if (rmpp_version) {
280 dev_notice(&device->dev,
281 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
282 mad_reg_req->mgmt_class);
283 goto error1;
284 }
285 }
286
287 /* Make sure class supplied is consistent with QP type */
288 if (qp_type == IB_QPT_SMI) {
289 if ((mad_reg_req->mgmt_class !=
290 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
291 (mad_reg_req->mgmt_class !=
292 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
293 dev_notice(&device->dev,
294 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
295 mad_reg_req->mgmt_class);
296 goto error1;
297 }
298 } else {
299 if ((mad_reg_req->mgmt_class ==
300 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
301 (mad_reg_req->mgmt_class ==
302 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
303 dev_notice(&device->dev,
304 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
305 mad_reg_req->mgmt_class);
306 goto error1;
307 }
308 }
309 } else {
310 /* No registration request supplied */
311 if (!send_handler)
312 goto error1;
313 if (registration_flags & IB_MAD_USER_RMPP)
314 goto error1;
315 }
316
317 /* Validate device and port */
318 port_priv = ib_get_mad_port(device, port_num);
319 if (!port_priv) {
320 dev_notice(&device->dev,
321 "ib_register_mad_agent: Invalid port %d\n",
322 port_num);
323 ret = ERR_PTR(-ENODEV);
324 goto error1;
325 }
326
327 /* Verify the QP requested is supported. For example, Ethernet devices
328 * will not have QP0 */
329 if (!port_priv->qp_info[qpn].qp) {
330 dev_notice(&device->dev,
331 "ib_register_mad_agent: QP %d not supported\n", qpn);
332 ret = ERR_PTR(-EPROTONOSUPPORT);
333 goto error1;
334 }
335
336 /* Allocate structures */
337 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
338 if (!mad_agent_priv) {
339 ret = ERR_PTR(-ENOMEM);
340 goto error1;
341 }
342
343 if (mad_reg_req) {
344 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
345 if (!reg_req) {
346 ret = ERR_PTR(-ENOMEM);
347 goto error3;
348 }
349 }
350
351 /* Now, fill in the various structures */
352 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
353 mad_agent_priv->reg_req = reg_req;
354 mad_agent_priv->agent.rmpp_version = rmpp_version;
355 mad_agent_priv->agent.device = device;
356 mad_agent_priv->agent.recv_handler = recv_handler;
357 mad_agent_priv->agent.send_handler = send_handler;
358 mad_agent_priv->agent.context = context;
359 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
360 mad_agent_priv->agent.port_num = port_num;
361 mad_agent_priv->agent.flags = registration_flags;
362 spin_lock_init(&mad_agent_priv->lock);
363 INIT_LIST_HEAD(&mad_agent_priv->send_list);
364 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
365 INIT_LIST_HEAD(&mad_agent_priv->done_list);
366 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
367 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
368 INIT_LIST_HEAD(&mad_agent_priv->local_list);
369 INIT_WORK(&mad_agent_priv->local_work, local_completions);
370 atomic_set(&mad_agent_priv->refcount, 1);
371 init_completion(&mad_agent_priv->comp);
372
373 ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
374 if (ret2) {
375 ret = ERR_PTR(ret2);
376 goto error4;
377 }
378
379 spin_lock_irqsave(&port_priv->reg_lock, flags);
380 mad_agent_priv->agent.hi_tid = atomic_inc_return(&ib_mad_client_id);
381
382 /*
383 * Make sure MAD registration (if supplied)
384 * is non overlapping with any existing ones
385 */
386 if (mad_reg_req) {
387 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
388 if (!is_vendor_class(mgmt_class)) {
389 class = port_priv->version[mad_reg_req->
390 mgmt_class_version].class;
391 if (class) {
392 method = class->method_table[mgmt_class];
393 if (method) {
394 if (method_in_use(&method,
395 mad_reg_req))
396 goto error5;
397 }
398 }
399 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
400 mgmt_class);
401 } else {
402 /* "New" vendor class range */
403 vendor = port_priv->version[mad_reg_req->
404 mgmt_class_version].vendor;
405 if (vendor) {
406 vclass = vendor_class_index(mgmt_class);
407 vendor_class = vendor->vendor_class[vclass];
408 if (vendor_class) {
409 if (is_vendor_method_in_use(
410 vendor_class,
411 mad_reg_req))
412 goto error5;
413 }
414 }
415 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
416 }
417 if (ret2) {
418 ret = ERR_PTR(ret2);
419 goto error5;
420 }
421 }
422
423 /* Add mad agent into port's agent list */
424 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
425 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
426
427 return &mad_agent_priv->agent;
428error5:
429 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
430 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
431error4:
432 kfree(reg_req);
433error3:
434 kfree(mad_agent_priv);
435error1:
436 return ret;
437}
438EXPORT_SYMBOL(ib_register_mad_agent);
439
440static inline int is_snooping_sends(int mad_snoop_flags)
441{
442 return (mad_snoop_flags &
443 (/*IB_MAD_SNOOP_POSTED_SENDS |
444 IB_MAD_SNOOP_RMPP_SENDS |*/
445 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
446 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
447}
448
449static inline int is_snooping_recvs(int mad_snoop_flags)
450{
451 return (mad_snoop_flags &
452 (IB_MAD_SNOOP_RECVS /*|
453 IB_MAD_SNOOP_RMPP_RECVS*/));
454}
455
456static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
457 struct ib_mad_snoop_private *mad_snoop_priv)
458{
459 struct ib_mad_snoop_private **new_snoop_table;
460 unsigned long flags;
461 int i;
462
463 spin_lock_irqsave(&qp_info->snoop_lock, flags);
464 /* Check for empty slot in array. */
465 for (i = 0; i < qp_info->snoop_table_size; i++)
466 if (!qp_info->snoop_table[i])
467 break;
468
469 if (i == qp_info->snoop_table_size) {
470 /* Grow table. */
471 new_snoop_table = krealloc(qp_info->snoop_table,
472 sizeof mad_snoop_priv *
473 (qp_info->snoop_table_size + 1),
474 GFP_ATOMIC);
475 if (!new_snoop_table) {
476 i = -ENOMEM;
477 goto out;
478 }
479
480 qp_info->snoop_table = new_snoop_table;
481 qp_info->snoop_table_size++;
482 }
483 qp_info->snoop_table[i] = mad_snoop_priv;
484 atomic_inc(&qp_info->snoop_count);
485out:
486 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
487 return i;
488}
489
490struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
491 u8 port_num,
492 enum ib_qp_type qp_type,
493 int mad_snoop_flags,
494 ib_mad_snoop_handler snoop_handler,
495 ib_mad_recv_handler recv_handler,
496 void *context)
497{
498 struct ib_mad_port_private *port_priv;
499 struct ib_mad_agent *ret;
500 struct ib_mad_snoop_private *mad_snoop_priv;
501 int qpn;
502 int err;
503
504 /* Validate parameters */
505 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
506 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
507 ret = ERR_PTR(-EINVAL);
508 goto error1;
509 }
510 qpn = get_spl_qp_index(qp_type);
511 if (qpn == -1) {
512 ret = ERR_PTR(-EINVAL);
513 goto error1;
514 }
515 port_priv = ib_get_mad_port(device, port_num);
516 if (!port_priv) {
517 ret = ERR_PTR(-ENODEV);
518 goto error1;
519 }
520 /* Allocate structures */
521 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
522 if (!mad_snoop_priv) {
523 ret = ERR_PTR(-ENOMEM);
524 goto error1;
525 }
526
527 /* Now, fill in the various structures */
528 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
529 mad_snoop_priv->agent.device = device;
530 mad_snoop_priv->agent.recv_handler = recv_handler;
531 mad_snoop_priv->agent.snoop_handler = snoop_handler;
532 mad_snoop_priv->agent.context = context;
533 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
534 mad_snoop_priv->agent.port_num = port_num;
535 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
536 init_completion(&mad_snoop_priv->comp);
537
538 err = ib_mad_agent_security_setup(&mad_snoop_priv->agent, qp_type);
539 if (err) {
540 ret = ERR_PTR(err);
541 goto error2;
542 }
543
544 mad_snoop_priv->snoop_index = register_snoop_agent(
545 &port_priv->qp_info[qpn],
546 mad_snoop_priv);
547 if (mad_snoop_priv->snoop_index < 0) {
548 ret = ERR_PTR(mad_snoop_priv->snoop_index);
549 goto error3;
550 }
551
552 atomic_set(&mad_snoop_priv->refcount, 1);
553 return &mad_snoop_priv->agent;
554error3:
555 ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
556error2:
557 kfree(mad_snoop_priv);
558error1:
559 return ret;
560}
561EXPORT_SYMBOL(ib_register_mad_snoop);
562
563static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
564{
565 if (atomic_dec_and_test(&mad_agent_priv->refcount))
566 complete(&mad_agent_priv->comp);
567}
568
569static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
570{
571 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
572 complete(&mad_snoop_priv->comp);
573}
574
575static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
576{
577 struct ib_mad_port_private *port_priv;
578 unsigned long flags;
579
580 /* Note that we could still be handling received MADs */
581
582 /*
583 * Canceling all sends results in dropping received response
584 * MADs, preventing us from queuing additional work
585 */
586 cancel_mads(mad_agent_priv);
587 port_priv = mad_agent_priv->qp_info->port_priv;
588 cancel_delayed_work(&mad_agent_priv->timed_work);
589
590 spin_lock_irqsave(&port_priv->reg_lock, flags);
591 remove_mad_reg_req(mad_agent_priv);
592 list_del(&mad_agent_priv->agent_list);
593 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
594
595 flush_workqueue(port_priv->wq);
596 ib_cancel_rmpp_recvs(mad_agent_priv);
597
598 deref_mad_agent(mad_agent_priv);
599 wait_for_completion(&mad_agent_priv->comp);
600
601 ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
602
603 kfree(mad_agent_priv->reg_req);
604 kfree(mad_agent_priv);
605}
606
607static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
608{
609 struct ib_mad_qp_info *qp_info;
610 unsigned long flags;
611
612 qp_info = mad_snoop_priv->qp_info;
613 spin_lock_irqsave(&qp_info->snoop_lock, flags);
614 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
615 atomic_dec(&qp_info->snoop_count);
616 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
617
618 deref_snoop_agent(mad_snoop_priv);
619 wait_for_completion(&mad_snoop_priv->comp);
620
621 ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
622
623 kfree(mad_snoop_priv);
624}
625
626/*
627 * ib_unregister_mad_agent - Unregisters a client from using MAD services
628 */
629void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
630{
631 struct ib_mad_agent_private *mad_agent_priv;
632 struct ib_mad_snoop_private *mad_snoop_priv;
633
634 /* If the TID is zero, the agent can only snoop. */
635 if (mad_agent->hi_tid) {
636 mad_agent_priv = container_of(mad_agent,
637 struct ib_mad_agent_private,
638 agent);
639 unregister_mad_agent(mad_agent_priv);
640 } else {
641 mad_snoop_priv = container_of(mad_agent,
642 struct ib_mad_snoop_private,
643 agent);
644 unregister_mad_snoop(mad_snoop_priv);
645 }
646}
647EXPORT_SYMBOL(ib_unregister_mad_agent);
648
649static void dequeue_mad(struct ib_mad_list_head *mad_list)
650{
651 struct ib_mad_queue *mad_queue;
652 unsigned long flags;
653
654 BUG_ON(!mad_list->mad_queue);
655 mad_queue = mad_list->mad_queue;
656 spin_lock_irqsave(&mad_queue->lock, flags);
657 list_del(&mad_list->list);
658 mad_queue->count--;
659 spin_unlock_irqrestore(&mad_queue->lock, flags);
660}
661
662static void snoop_send(struct ib_mad_qp_info *qp_info,
663 struct ib_mad_send_buf *send_buf,
664 struct ib_mad_send_wc *mad_send_wc,
665 int mad_snoop_flags)
666{
667 struct ib_mad_snoop_private *mad_snoop_priv;
668 unsigned long flags;
669 int i;
670
671 spin_lock_irqsave(&qp_info->snoop_lock, flags);
672 for (i = 0; i < qp_info->snoop_table_size; i++) {
673 mad_snoop_priv = qp_info->snoop_table[i];
674 if (!mad_snoop_priv ||
675 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
676 continue;
677
678 atomic_inc(&mad_snoop_priv->refcount);
679 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
680 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
681 send_buf, mad_send_wc);
682 deref_snoop_agent(mad_snoop_priv);
683 spin_lock_irqsave(&qp_info->snoop_lock, flags);
684 }
685 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
686}
687
688static void snoop_recv(struct ib_mad_qp_info *qp_info,
689 struct ib_mad_recv_wc *mad_recv_wc,
690 int mad_snoop_flags)
691{
692 struct ib_mad_snoop_private *mad_snoop_priv;
693 unsigned long flags;
694 int i;
695
696 spin_lock_irqsave(&qp_info->snoop_lock, flags);
697 for (i = 0; i < qp_info->snoop_table_size; i++) {
698 mad_snoop_priv = qp_info->snoop_table[i];
699 if (!mad_snoop_priv ||
700 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
701 continue;
702
703 atomic_inc(&mad_snoop_priv->refcount);
704 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
705 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
706 mad_recv_wc);
707 deref_snoop_agent(mad_snoop_priv);
708 spin_lock_irqsave(&qp_info->snoop_lock, flags);
709 }
710 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
711}
712
713static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
714 u16 pkey_index, u8 port_num, struct ib_wc *wc)
715{
716 memset(wc, 0, sizeof *wc);
717 wc->wr_cqe = cqe;
718 wc->status = IB_WC_SUCCESS;
719 wc->opcode = IB_WC_RECV;
720 wc->pkey_index = pkey_index;
721 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
722 wc->src_qp = IB_QP0;
723 wc->qp = qp;
724 wc->slid = slid;
725 wc->sl = 0;
726 wc->dlid_path_bits = 0;
727 wc->port_num = port_num;
728}
729
730static size_t mad_priv_size(const struct ib_mad_private *mp)
731{
732 return sizeof(struct ib_mad_private) + mp->mad_size;
733}
734
735static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
736{
737 size_t size = sizeof(struct ib_mad_private) + mad_size;
738 struct ib_mad_private *ret = kzalloc(size, flags);
739
740 if (ret)
741 ret->mad_size = mad_size;
742
743 return ret;
744}
745
746static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
747{
748 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
749}
750
751static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
752{
753 return sizeof(struct ib_grh) + mp->mad_size;
754}
755
756/*
757 * Return 0 if SMP is to be sent
758 * Return 1 if SMP was consumed locally (whether or not solicited)
759 * Return < 0 if error
760 */
761static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
762 struct ib_mad_send_wr_private *mad_send_wr)
763{
764 int ret = 0;
765 struct ib_smp *smp = mad_send_wr->send_buf.mad;
766 struct opa_smp *opa_smp = (struct opa_smp *)smp;
767 unsigned long flags;
768 struct ib_mad_local_private *local;
769 struct ib_mad_private *mad_priv;
770 struct ib_mad_port_private *port_priv;
771 struct ib_mad_agent_private *recv_mad_agent = NULL;
772 struct ib_device *device = mad_agent_priv->agent.device;
773 u8 port_num;
774 struct ib_wc mad_wc;
775 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
776 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
777 u16 out_mad_pkey_index = 0;
778 u16 drslid;
779 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
780 mad_agent_priv->qp_info->port_priv->port_num);
781
782 if (rdma_cap_ib_switch(device) &&
783 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
784 port_num = send_wr->port_num;
785 else
786 port_num = mad_agent_priv->agent.port_num;
787
788 /*
789 * Directed route handling starts if the initial LID routed part of
790 * a request or the ending LID routed part of a response is empty.
791 * If we are at the start of the LID routed part, don't update the
792 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
793 */
794 if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
795 u32 opa_drslid;
796
797 if ((opa_get_smp_direction(opa_smp)
798 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
799 OPA_LID_PERMISSIVE &&
800 opa_smi_handle_dr_smp_send(opa_smp,
801 rdma_cap_ib_switch(device),
802 port_num) == IB_SMI_DISCARD) {
803 ret = -EINVAL;
804 dev_err(&device->dev, "OPA Invalid directed route\n");
805 goto out;
806 }
807 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
808 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
809 opa_drslid & 0xffff0000) {
810 ret = -EINVAL;
811 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
812 opa_drslid);
813 goto out;
814 }
815 drslid = (u16)(opa_drslid & 0x0000ffff);
816
817 /* Check to post send on QP or process locally */
818 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
819 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
820 goto out;
821 } else {
822 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
823 IB_LID_PERMISSIVE &&
824 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
825 IB_SMI_DISCARD) {
826 ret = -EINVAL;
827 dev_err(&device->dev, "Invalid directed route\n");
828 goto out;
829 }
830 drslid = be16_to_cpu(smp->dr_slid);
831
832 /* Check to post send on QP or process locally */
833 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
834 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
835 goto out;
836 }
837
838 local = kmalloc(sizeof *local, GFP_ATOMIC);
839 if (!local) {
840 ret = -ENOMEM;
841 goto out;
842 }
843 local->mad_priv = NULL;
844 local->recv_mad_agent = NULL;
845 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
846 if (!mad_priv) {
847 ret = -ENOMEM;
848 kfree(local);
849 goto out;
850 }
851
852 build_smp_wc(mad_agent_priv->agent.qp,
853 send_wr->wr.wr_cqe, drslid,
854 send_wr->pkey_index,
855 send_wr->port_num, &mad_wc);
856
857 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
858 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
859 + mad_send_wr->send_buf.data_len
860 + sizeof(struct ib_grh);
861 }
862
863 /* No GRH for DR SMP */
864 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
865 (const struct ib_mad_hdr *)smp, mad_size,
866 (struct ib_mad_hdr *)mad_priv->mad,
867 &mad_size, &out_mad_pkey_index);
868 switch (ret)
869 {
870 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
871 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
872 mad_agent_priv->agent.recv_handler) {
873 local->mad_priv = mad_priv;
874 local->recv_mad_agent = mad_agent_priv;
875 /*
876 * Reference MAD agent until receive
877 * side of local completion handled
878 */
879 atomic_inc(&mad_agent_priv->refcount);
880 } else
881 kfree(mad_priv);
882 break;
883 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
884 kfree(mad_priv);
885 break;
886 case IB_MAD_RESULT_SUCCESS:
887 /* Treat like an incoming receive MAD */
888 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
889 mad_agent_priv->agent.port_num);
890 if (port_priv) {
891 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
892 recv_mad_agent = find_mad_agent(port_priv,
893 (const struct ib_mad_hdr *)mad_priv->mad);
894 }
895 if (!port_priv || !recv_mad_agent) {
896 /*
897 * No receiving agent so drop packet and
898 * generate send completion.
899 */
900 kfree(mad_priv);
901 break;
902 }
903 local->mad_priv = mad_priv;
904 local->recv_mad_agent = recv_mad_agent;
905 break;
906 default:
907 kfree(mad_priv);
908 kfree(local);
909 ret = -EINVAL;
910 goto out;
911 }
912
913 local->mad_send_wr = mad_send_wr;
914 if (opa) {
915 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
916 local->return_wc_byte_len = mad_size;
917 }
918 /* Reference MAD agent until send side of local completion handled */
919 atomic_inc(&mad_agent_priv->refcount);
920 /* Queue local completion to local list */
921 spin_lock_irqsave(&mad_agent_priv->lock, flags);
922 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
923 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
924 queue_work(mad_agent_priv->qp_info->port_priv->wq,
925 &mad_agent_priv->local_work);
926 ret = 1;
927out:
928 return ret;
929}
930
931static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
932{
933 int seg_size, pad;
934
935 seg_size = mad_size - hdr_len;
936 if (data_len && seg_size) {
937 pad = seg_size - data_len % seg_size;
938 return pad == seg_size ? 0 : pad;
939 } else
940 return seg_size;
941}
942
943static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
944{
945 struct ib_rmpp_segment *s, *t;
946
947 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
948 list_del(&s->list);
949 kfree(s);
950 }
951}
952
953static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
954 size_t mad_size, gfp_t gfp_mask)
955{
956 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
957 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
958 struct ib_rmpp_segment *seg = NULL;
959 int left, seg_size, pad;
960
961 send_buf->seg_size = mad_size - send_buf->hdr_len;
962 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
963 seg_size = send_buf->seg_size;
964 pad = send_wr->pad;
965
966 /* Allocate data segments. */
967 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
968 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
969 if (!seg) {
970 free_send_rmpp_list(send_wr);
971 return -ENOMEM;
972 }
973 seg->num = ++send_buf->seg_count;
974 list_add_tail(&seg->list, &send_wr->rmpp_list);
975 }
976
977 /* Zero any padding */
978 if (pad)
979 memset(seg->data + seg_size - pad, 0, pad);
980
981 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
982 agent.rmpp_version;
983 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
984 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
985
986 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
987 struct ib_rmpp_segment, list);
988 send_wr->last_ack_seg = send_wr->cur_seg;
989 return 0;
990}
991
992int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
993{
994 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
995}
996EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
997
998struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
999 u32 remote_qpn, u16 pkey_index,
1000 int rmpp_active,
1001 int hdr_len, int data_len,
1002 gfp_t gfp_mask,
1003 u8 base_version)
1004{
1005 struct ib_mad_agent_private *mad_agent_priv;
1006 struct ib_mad_send_wr_private *mad_send_wr;
1007 int pad, message_size, ret, size;
1008 void *buf;
1009 size_t mad_size;
1010 bool opa;
1011
1012 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1013 agent);
1014
1015 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1016
1017 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1018 mad_size = sizeof(struct opa_mad);
1019 else
1020 mad_size = sizeof(struct ib_mad);
1021
1022 pad = get_pad_size(hdr_len, data_len, mad_size);
1023 message_size = hdr_len + data_len + pad;
1024
1025 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1026 if (!rmpp_active && message_size > mad_size)
1027 return ERR_PTR(-EINVAL);
1028 } else
1029 if (rmpp_active || message_size > mad_size)
1030 return ERR_PTR(-EINVAL);
1031
1032 size = rmpp_active ? hdr_len : mad_size;
1033 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1034 if (!buf)
1035 return ERR_PTR(-ENOMEM);
1036
1037 mad_send_wr = buf + size;
1038 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1039 mad_send_wr->send_buf.mad = buf;
1040 mad_send_wr->send_buf.hdr_len = hdr_len;
1041 mad_send_wr->send_buf.data_len = data_len;
1042 mad_send_wr->pad = pad;
1043
1044 mad_send_wr->mad_agent_priv = mad_agent_priv;
1045 mad_send_wr->sg_list[0].length = hdr_len;
1046 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1047
1048 /* OPA MADs don't have to be the full 2048 bytes */
1049 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1050 data_len < mad_size - hdr_len)
1051 mad_send_wr->sg_list[1].length = data_len;
1052 else
1053 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1054
1055 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1056
1057 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1058
1059 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1060 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1061 mad_send_wr->send_wr.wr.num_sge = 2;
1062 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1063 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1064 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1065 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1066 mad_send_wr->send_wr.pkey_index = pkey_index;
1067
1068 if (rmpp_active) {
1069 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1070 if (ret) {
1071 kfree(buf);
1072 return ERR_PTR(ret);
1073 }
1074 }
1075
1076 mad_send_wr->send_buf.mad_agent = mad_agent;
1077 atomic_inc(&mad_agent_priv->refcount);
1078 return &mad_send_wr->send_buf;
1079}
1080EXPORT_SYMBOL(ib_create_send_mad);
1081
1082int ib_get_mad_data_offset(u8 mgmt_class)
1083{
1084 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1085 return IB_MGMT_SA_HDR;
1086 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1087 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1088 (mgmt_class == IB_MGMT_CLASS_BIS))
1089 return IB_MGMT_DEVICE_HDR;
1090 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1091 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1092 return IB_MGMT_VENDOR_HDR;
1093 else
1094 return IB_MGMT_MAD_HDR;
1095}
1096EXPORT_SYMBOL(ib_get_mad_data_offset);
1097
1098int ib_is_mad_class_rmpp(u8 mgmt_class)
1099{
1100 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1101 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1102 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1103 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1104 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1105 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1106 return 1;
1107 return 0;
1108}
1109EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1110
1111void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1112{
1113 struct ib_mad_send_wr_private *mad_send_wr;
1114 struct list_head *list;
1115
1116 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1117 send_buf);
1118 list = &mad_send_wr->cur_seg->list;
1119
1120 if (mad_send_wr->cur_seg->num < seg_num) {
1121 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1122 if (mad_send_wr->cur_seg->num == seg_num)
1123 break;
1124 } else if (mad_send_wr->cur_seg->num > seg_num) {
1125 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1126 if (mad_send_wr->cur_seg->num == seg_num)
1127 break;
1128 }
1129 return mad_send_wr->cur_seg->data;
1130}
1131EXPORT_SYMBOL(ib_get_rmpp_segment);
1132
1133static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1134{
1135 if (mad_send_wr->send_buf.seg_count)
1136 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1137 mad_send_wr->seg_num);
1138 else
1139 return mad_send_wr->send_buf.mad +
1140 mad_send_wr->send_buf.hdr_len;
1141}
1142
1143void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1144{
1145 struct ib_mad_agent_private *mad_agent_priv;
1146 struct ib_mad_send_wr_private *mad_send_wr;
1147
1148 mad_agent_priv = container_of(send_buf->mad_agent,
1149 struct ib_mad_agent_private, agent);
1150 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1151 send_buf);
1152
1153 free_send_rmpp_list(mad_send_wr);
1154 kfree(send_buf->mad);
1155 deref_mad_agent(mad_agent_priv);
1156}
1157EXPORT_SYMBOL(ib_free_send_mad);
1158
1159int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1160{
1161 struct ib_mad_qp_info *qp_info;
1162 struct list_head *list;
1163 struct ib_send_wr *bad_send_wr;
1164 struct ib_mad_agent *mad_agent;
1165 struct ib_sge *sge;
1166 unsigned long flags;
1167 int ret;
1168
1169 /* Set WR ID to find mad_send_wr upon completion */
1170 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1171 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1172 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1173 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1174
1175 mad_agent = mad_send_wr->send_buf.mad_agent;
1176 sge = mad_send_wr->sg_list;
1177 sge[0].addr = ib_dma_map_single(mad_agent->device,
1178 mad_send_wr->send_buf.mad,
1179 sge[0].length,
1180 DMA_TO_DEVICE);
1181 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1182 return -ENOMEM;
1183
1184 mad_send_wr->header_mapping = sge[0].addr;
1185
1186 sge[1].addr = ib_dma_map_single(mad_agent->device,
1187 ib_get_payload(mad_send_wr),
1188 sge[1].length,
1189 DMA_TO_DEVICE);
1190 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1191 ib_dma_unmap_single(mad_agent->device,
1192 mad_send_wr->header_mapping,
1193 sge[0].length, DMA_TO_DEVICE);
1194 return -ENOMEM;
1195 }
1196 mad_send_wr->payload_mapping = sge[1].addr;
1197
1198 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1199 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1200 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1201 &bad_send_wr);
1202 list = &qp_info->send_queue.list;
1203 } else {
1204 ret = 0;
1205 list = &qp_info->overflow_list;
1206 }
1207
1208 if (!ret) {
1209 qp_info->send_queue.count++;
1210 list_add_tail(&mad_send_wr->mad_list.list, list);
1211 }
1212 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1213 if (ret) {
1214 ib_dma_unmap_single(mad_agent->device,
1215 mad_send_wr->header_mapping,
1216 sge[0].length, DMA_TO_DEVICE);
1217 ib_dma_unmap_single(mad_agent->device,
1218 mad_send_wr->payload_mapping,
1219 sge[1].length, DMA_TO_DEVICE);
1220 }
1221 return ret;
1222}
1223
1224/*
1225 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1226 * with the registered client
1227 */
1228int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1229 struct ib_mad_send_buf **bad_send_buf)
1230{
1231 struct ib_mad_agent_private *mad_agent_priv;
1232 struct ib_mad_send_buf *next_send_buf;
1233 struct ib_mad_send_wr_private *mad_send_wr;
1234 unsigned long flags;
1235 int ret = -EINVAL;
1236
1237 /* Walk list of send WRs and post each on send list */
1238 for (; send_buf; send_buf = next_send_buf) {
1239 mad_send_wr = container_of(send_buf,
1240 struct ib_mad_send_wr_private,
1241 send_buf);
1242 mad_agent_priv = mad_send_wr->mad_agent_priv;
1243
1244 ret = ib_mad_enforce_security(mad_agent_priv,
1245 mad_send_wr->send_wr.pkey_index);
1246 if (ret)
1247 goto error;
1248
1249 if (!send_buf->mad_agent->send_handler ||
1250 (send_buf->timeout_ms &&
1251 !send_buf->mad_agent->recv_handler)) {
1252 ret = -EINVAL;
1253 goto error;
1254 }
1255
1256 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1257 if (mad_agent_priv->agent.rmpp_version) {
1258 ret = -EINVAL;
1259 goto error;
1260 }
1261 }
1262
1263 /*
1264 * Save pointer to next work request to post in case the
1265 * current one completes, and the user modifies the work
1266 * request associated with the completion
1267 */
1268 next_send_buf = send_buf->next;
1269 mad_send_wr->send_wr.ah = send_buf->ah;
1270
1271 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1272 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1273 ret = handle_outgoing_dr_smp(mad_agent_priv,
1274 mad_send_wr);
1275 if (ret < 0) /* error */
1276 goto error;
1277 else if (ret == 1) /* locally consumed */
1278 continue;
1279 }
1280
1281 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1282 /* Timeout will be updated after send completes */
1283 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1284 mad_send_wr->max_retries = send_buf->retries;
1285 mad_send_wr->retries_left = send_buf->retries;
1286 send_buf->retries = 0;
1287 /* Reference for work request to QP + response */
1288 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1289 mad_send_wr->status = IB_WC_SUCCESS;
1290
1291 /* Reference MAD agent until send completes */
1292 atomic_inc(&mad_agent_priv->refcount);
1293 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1294 list_add_tail(&mad_send_wr->agent_list,
1295 &mad_agent_priv->send_list);
1296 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1297
1298 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1299 ret = ib_send_rmpp_mad(mad_send_wr);
1300 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1301 ret = ib_send_mad(mad_send_wr);
1302 } else
1303 ret = ib_send_mad(mad_send_wr);
1304 if (ret < 0) {
1305 /* Fail send request */
1306 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1307 list_del(&mad_send_wr->agent_list);
1308 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1309 atomic_dec(&mad_agent_priv->refcount);
1310 goto error;
1311 }
1312 }
1313 return 0;
1314error:
1315 if (bad_send_buf)
1316 *bad_send_buf = send_buf;
1317 return ret;
1318}
1319EXPORT_SYMBOL(ib_post_send_mad);
1320
1321/*
1322 * ib_free_recv_mad - Returns data buffers used to receive
1323 * a MAD to the access layer
1324 */
1325void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1326{
1327 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1328 struct ib_mad_private_header *mad_priv_hdr;
1329 struct ib_mad_private *priv;
1330 struct list_head free_list;
1331
1332 INIT_LIST_HEAD(&free_list);
1333 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1334
1335 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1336 &free_list, list) {
1337 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1338 recv_buf);
1339 mad_priv_hdr = container_of(mad_recv_wc,
1340 struct ib_mad_private_header,
1341 recv_wc);
1342 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1343 header);
1344 kfree(priv);
1345 }
1346}
1347EXPORT_SYMBOL(ib_free_recv_mad);
1348
1349struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1350 u8 rmpp_version,
1351 ib_mad_send_handler send_handler,
1352 ib_mad_recv_handler recv_handler,
1353 void *context)
1354{
1355 return ERR_PTR(-EINVAL); /* XXX: for now */
1356}
1357EXPORT_SYMBOL(ib_redirect_mad_qp);
1358
1359int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1360 struct ib_wc *wc)
1361{
1362 dev_err(&mad_agent->device->dev,
1363 "ib_process_mad_wc() not implemented yet\n");
1364 return 0;
1365}
1366EXPORT_SYMBOL(ib_process_mad_wc);
1367
1368static int method_in_use(struct ib_mad_mgmt_method_table **method,
1369 struct ib_mad_reg_req *mad_reg_req)
1370{
1371 int i;
1372
1373 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1374 if ((*method)->agent[i]) {
1375 pr_err("Method %d already in use\n", i);
1376 return -EINVAL;
1377 }
1378 }
1379 return 0;
1380}
1381
1382static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1383{
1384 /* Allocate management method table */
1385 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1386 return (*method) ? 0 : (-ENOMEM);
1387}
1388
1389/*
1390 * Check to see if there are any methods still in use
1391 */
1392static int check_method_table(struct ib_mad_mgmt_method_table *method)
1393{
1394 int i;
1395
1396 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1397 if (method->agent[i])
1398 return 1;
1399 return 0;
1400}
1401
1402/*
1403 * Check to see if there are any method tables for this class still in use
1404 */
1405static int check_class_table(struct ib_mad_mgmt_class_table *class)
1406{
1407 int i;
1408
1409 for (i = 0; i < MAX_MGMT_CLASS; i++)
1410 if (class->method_table[i])
1411 return 1;
1412 return 0;
1413}
1414
1415static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1416{
1417 int i;
1418
1419 for (i = 0; i < MAX_MGMT_OUI; i++)
1420 if (vendor_class->method_table[i])
1421 return 1;
1422 return 0;
1423}
1424
1425static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1426 const char *oui)
1427{
1428 int i;
1429
1430 for (i = 0; i < MAX_MGMT_OUI; i++)
1431 /* Is there matching OUI for this vendor class ? */
1432 if (!memcmp(vendor_class->oui[i], oui, 3))
1433 return i;
1434
1435 return -1;
1436}
1437
1438static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1439{
1440 int i;
1441
1442 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1443 if (vendor->vendor_class[i])
1444 return 1;
1445
1446 return 0;
1447}
1448
1449static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1450 struct ib_mad_agent_private *agent)
1451{
1452 int i;
1453
1454 /* Remove any methods for this mad agent */
1455 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1456 if (method->agent[i] == agent) {
1457 method->agent[i] = NULL;
1458 }
1459 }
1460}
1461
1462static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1463 struct ib_mad_agent_private *agent_priv,
1464 u8 mgmt_class)
1465{
1466 struct ib_mad_port_private *port_priv;
1467 struct ib_mad_mgmt_class_table **class;
1468 struct ib_mad_mgmt_method_table **method;
1469 int i, ret;
1470
1471 port_priv = agent_priv->qp_info->port_priv;
1472 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1473 if (!*class) {
1474 /* Allocate management class table for "new" class version */
1475 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1476 if (!*class) {
1477 ret = -ENOMEM;
1478 goto error1;
1479 }
1480
1481 /* Allocate method table for this management class */
1482 method = &(*class)->method_table[mgmt_class];
1483 if ((ret = allocate_method_table(method)))
1484 goto error2;
1485 } else {
1486 method = &(*class)->method_table[mgmt_class];
1487 if (!*method) {
1488 /* Allocate method table for this management class */
1489 if ((ret = allocate_method_table(method)))
1490 goto error1;
1491 }
1492 }
1493
1494 /* Now, make sure methods are not already in use */
1495 if (method_in_use(method, mad_reg_req))
1496 goto error3;
1497
1498 /* Finally, add in methods being registered */
1499 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1500 (*method)->agent[i] = agent_priv;
1501
1502 return 0;
1503
1504error3:
1505 /* Remove any methods for this mad agent */
1506 remove_methods_mad_agent(*method, agent_priv);
1507 /* Now, check to see if there are any methods in use */
1508 if (!check_method_table(*method)) {
1509 /* If not, release management method table */
1510 kfree(*method);
1511 *method = NULL;
1512 }
1513 ret = -EINVAL;
1514 goto error1;
1515error2:
1516 kfree(*class);
1517 *class = NULL;
1518error1:
1519 return ret;
1520}
1521
1522static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1523 struct ib_mad_agent_private *agent_priv)
1524{
1525 struct ib_mad_port_private *port_priv;
1526 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1527 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1528 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1529 struct ib_mad_mgmt_method_table **method;
1530 int i, ret = -ENOMEM;
1531 u8 vclass;
1532
1533 /* "New" vendor (with OUI) class */
1534 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1535 port_priv = agent_priv->qp_info->port_priv;
1536 vendor_table = &port_priv->version[
1537 mad_reg_req->mgmt_class_version].vendor;
1538 if (!*vendor_table) {
1539 /* Allocate mgmt vendor class table for "new" class version */
1540 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1541 if (!vendor)
1542 goto error1;
1543
1544 *vendor_table = vendor;
1545 }
1546 if (!(*vendor_table)->vendor_class[vclass]) {
1547 /* Allocate table for this management vendor class */
1548 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1549 if (!vendor_class)
1550 goto error2;
1551
1552 (*vendor_table)->vendor_class[vclass] = vendor_class;
1553 }
1554 for (i = 0; i < MAX_MGMT_OUI; i++) {
1555 /* Is there matching OUI for this vendor class ? */
1556 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1557 mad_reg_req->oui, 3)) {
1558 method = &(*vendor_table)->vendor_class[
1559 vclass]->method_table[i];
1560 BUG_ON(!*method);
1561 goto check_in_use;
1562 }
1563 }
1564 for (i = 0; i < MAX_MGMT_OUI; i++) {
1565 /* OUI slot available ? */
1566 if (!is_vendor_oui((*vendor_table)->vendor_class[
1567 vclass]->oui[i])) {
1568 method = &(*vendor_table)->vendor_class[
1569 vclass]->method_table[i];
1570 BUG_ON(*method);
1571 /* Allocate method table for this OUI */
1572 if ((ret = allocate_method_table(method)))
1573 goto error3;
1574 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1575 mad_reg_req->oui, 3);
1576 goto check_in_use;
1577 }
1578 }
1579 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1580 goto error3;
1581
1582check_in_use:
1583 /* Now, make sure methods are not already in use */
1584 if (method_in_use(method, mad_reg_req))
1585 goto error4;
1586
1587 /* Finally, add in methods being registered */
1588 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1589 (*method)->agent[i] = agent_priv;
1590
1591 return 0;
1592
1593error4:
1594 /* Remove any methods for this mad agent */
1595 remove_methods_mad_agent(*method, agent_priv);
1596 /* Now, check to see if there are any methods in use */
1597 if (!check_method_table(*method)) {
1598 /* If not, release management method table */
1599 kfree(*method);
1600 *method = NULL;
1601 }
1602 ret = -EINVAL;
1603error3:
1604 if (vendor_class) {
1605 (*vendor_table)->vendor_class[vclass] = NULL;
1606 kfree(vendor_class);
1607 }
1608error2:
1609 if (vendor) {
1610 *vendor_table = NULL;
1611 kfree(vendor);
1612 }
1613error1:
1614 return ret;
1615}
1616
1617static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1618{
1619 struct ib_mad_port_private *port_priv;
1620 struct ib_mad_mgmt_class_table *class;
1621 struct ib_mad_mgmt_method_table *method;
1622 struct ib_mad_mgmt_vendor_class_table *vendor;
1623 struct ib_mad_mgmt_vendor_class *vendor_class;
1624 int index;
1625 u8 mgmt_class;
1626
1627 /*
1628 * Was MAD registration request supplied
1629 * with original registration ?
1630 */
1631 if (!agent_priv->reg_req) {
1632 goto out;
1633 }
1634
1635 port_priv = agent_priv->qp_info->port_priv;
1636 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1637 class = port_priv->version[
1638 agent_priv->reg_req->mgmt_class_version].class;
1639 if (!class)
1640 goto vendor_check;
1641
1642 method = class->method_table[mgmt_class];
1643 if (method) {
1644 /* Remove any methods for this mad agent */
1645 remove_methods_mad_agent(method, agent_priv);
1646 /* Now, check to see if there are any methods still in use */
1647 if (!check_method_table(method)) {
1648 /* If not, release management method table */
1649 kfree(method);
1650 class->method_table[mgmt_class] = NULL;
1651 /* Any management classes left ? */
1652 if (!check_class_table(class)) {
1653 /* If not, release management class table */
1654 kfree(class);
1655 port_priv->version[
1656 agent_priv->reg_req->
1657 mgmt_class_version].class = NULL;
1658 }
1659 }
1660 }
1661
1662vendor_check:
1663 if (!is_vendor_class(mgmt_class))
1664 goto out;
1665
1666 /* normalize mgmt_class to vendor range 2 */
1667 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1668 vendor = port_priv->version[
1669 agent_priv->reg_req->mgmt_class_version].vendor;
1670
1671 if (!vendor)
1672 goto out;
1673
1674 vendor_class = vendor->vendor_class[mgmt_class];
1675 if (vendor_class) {
1676 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1677 if (index < 0)
1678 goto out;
1679 method = vendor_class->method_table[index];
1680 if (method) {
1681 /* Remove any methods for this mad agent */
1682 remove_methods_mad_agent(method, agent_priv);
1683 /*
1684 * Now, check to see if there are
1685 * any methods still in use
1686 */
1687 if (!check_method_table(method)) {
1688 /* If not, release management method table */
1689 kfree(method);
1690 vendor_class->method_table[index] = NULL;
1691 memset(vendor_class->oui[index], 0, 3);
1692 /* Any OUIs left ? */
1693 if (!check_vendor_class(vendor_class)) {
1694 /* If not, release vendor class table */
1695 kfree(vendor_class);
1696 vendor->vendor_class[mgmt_class] = NULL;
1697 /* Any other vendor classes left ? */
1698 if (!check_vendor_table(vendor)) {
1699 kfree(vendor);
1700 port_priv->version[
1701 agent_priv->reg_req->
1702 mgmt_class_version].
1703 vendor = NULL;
1704 }
1705 }
1706 }
1707 }
1708 }
1709
1710out:
1711 return;
1712}
1713
1714static struct ib_mad_agent_private *
1715find_mad_agent(struct ib_mad_port_private *port_priv,
1716 const struct ib_mad_hdr *mad_hdr)
1717{
1718 struct ib_mad_agent_private *mad_agent = NULL;
1719 unsigned long flags;
1720
1721 spin_lock_irqsave(&port_priv->reg_lock, flags);
1722 if (ib_response_mad(mad_hdr)) {
1723 u32 hi_tid;
1724 struct ib_mad_agent_private *entry;
1725
1726 /*
1727 * Routing is based on high 32 bits of transaction ID
1728 * of MAD.
1729 */
1730 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1731 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1732 if (entry->agent.hi_tid == hi_tid) {
1733 mad_agent = entry;
1734 break;
1735 }
1736 }
1737 } else {
1738 struct ib_mad_mgmt_class_table *class;
1739 struct ib_mad_mgmt_method_table *method;
1740 struct ib_mad_mgmt_vendor_class_table *vendor;
1741 struct ib_mad_mgmt_vendor_class *vendor_class;
1742 const struct ib_vendor_mad *vendor_mad;
1743 int index;
1744
1745 /*
1746 * Routing is based on version, class, and method
1747 * For "newer" vendor MADs, also based on OUI
1748 */
1749 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1750 goto out;
1751 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1752 class = port_priv->version[
1753 mad_hdr->class_version].class;
1754 if (!class)
1755 goto out;
1756 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1757 ARRAY_SIZE(class->method_table))
1758 goto out;
1759 method = class->method_table[convert_mgmt_class(
1760 mad_hdr->mgmt_class)];
1761 if (method)
1762 mad_agent = method->agent[mad_hdr->method &
1763 ~IB_MGMT_METHOD_RESP];
1764 } else {
1765 vendor = port_priv->version[
1766 mad_hdr->class_version].vendor;
1767 if (!vendor)
1768 goto out;
1769 vendor_class = vendor->vendor_class[vendor_class_index(
1770 mad_hdr->mgmt_class)];
1771 if (!vendor_class)
1772 goto out;
1773 /* Find matching OUI */
1774 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1775 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1776 if (index == -1)
1777 goto out;
1778 method = vendor_class->method_table[index];
1779 if (method) {
1780 mad_agent = method->agent[mad_hdr->method &
1781 ~IB_MGMT_METHOD_RESP];
1782 }
1783 }
1784 }
1785
1786 if (mad_agent) {
1787 if (mad_agent->agent.recv_handler)
1788 atomic_inc(&mad_agent->refcount);
1789 else {
1790 dev_notice(&port_priv->device->dev,
1791 "No receive handler for client %p on port %d\n",
1792 &mad_agent->agent, port_priv->port_num);
1793 mad_agent = NULL;
1794 }
1795 }
1796out:
1797 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1798
1799 return mad_agent;
1800}
1801
1802static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1803 const struct ib_mad_qp_info *qp_info,
1804 bool opa)
1805{
1806 int valid = 0;
1807 u32 qp_num = qp_info->qp->qp_num;
1808
1809 /* Make sure MAD base version is understood */
1810 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1811 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1812 pr_err("MAD received with unsupported base version %d %s\n",
1813 mad_hdr->base_version, opa ? "(opa)" : "");
1814 goto out;
1815 }
1816
1817 /* Filter SMI packets sent to other than QP0 */
1818 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1819 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1820 if (qp_num == 0)
1821 valid = 1;
1822 } else {
1823 /* CM attributes other than ClassPortInfo only use Send method */
1824 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1825 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1826 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1827 goto out;
1828 /* Filter GSI packets sent to QP0 */
1829 if (qp_num != 0)
1830 valid = 1;
1831 }
1832
1833out:
1834 return valid;
1835}
1836
1837static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1838 const struct ib_mad_hdr *mad_hdr)
1839{
1840 struct ib_rmpp_mad *rmpp_mad;
1841
1842 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1843 return !mad_agent_priv->agent.rmpp_version ||
1844 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1845 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1846 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1847 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1848}
1849
1850static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1851 const struct ib_mad_recv_wc *rwc)
1852{
1853 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1854 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1855}
1856
1857static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1858 const struct ib_mad_send_wr_private *wr,
1859 const struct ib_mad_recv_wc *rwc )
1860{
1861 struct rdma_ah_attr attr;
1862 u8 send_resp, rcv_resp;
1863 union ib_gid sgid;
1864 struct ib_device *device = mad_agent_priv->agent.device;
1865 u8 port_num = mad_agent_priv->agent.port_num;
1866 u8 lmc;
1867 bool has_grh;
1868
1869 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1870 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1871
1872 if (send_resp == rcv_resp)
1873 /* both requests, or both responses. GIDs different */
1874 return 0;
1875
1876 if (rdma_query_ah(wr->send_buf.ah, &attr))
1877 /* Assume not equal, to avoid false positives. */
1878 return 0;
1879
1880 has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1881 if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1882 /* one has GID, other does not. Assume different */
1883 return 0;
1884
1885 if (!send_resp && rcv_resp) {
1886 /* is request/response. */
1887 if (!has_grh) {
1888 if (ib_get_cached_lmc(device, port_num, &lmc))
1889 return 0;
1890 return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1891 rwc->wc->dlid_path_bits) &
1892 ((1 << lmc) - 1)));
1893 } else {
1894 const struct ib_global_route *grh =
1895 rdma_ah_read_grh(&attr);
1896
1897 if (ib_get_cached_gid(device, port_num,
1898 grh->sgid_index, &sgid, NULL))
1899 return 0;
1900 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1901 16);
1902 }
1903 }
1904
1905 if (!has_grh)
1906 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1907 else
1908 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1909 rwc->recv_buf.grh->sgid.raw,
1910 16);
1911}
1912
1913static inline int is_direct(u8 class)
1914{
1915 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1916}
1917
1918struct ib_mad_send_wr_private*
1919ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1920 const struct ib_mad_recv_wc *wc)
1921{
1922 struct ib_mad_send_wr_private *wr;
1923 const struct ib_mad_hdr *mad_hdr;
1924
1925 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1926
1927 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1928 if ((wr->tid == mad_hdr->tid) &&
1929 rcv_has_same_class(wr, wc) &&
1930 /*
1931 * Don't check GID for direct routed MADs.
1932 * These might have permissive LIDs.
1933 */
1934 (is_direct(mad_hdr->mgmt_class) ||
1935 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1936 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1937 }
1938
1939 /*
1940 * It's possible to receive the response before we've
1941 * been notified that the send has completed
1942 */
1943 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1944 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1945 wr->tid == mad_hdr->tid &&
1946 wr->timeout &&
1947 rcv_has_same_class(wr, wc) &&
1948 /*
1949 * Don't check GID for direct routed MADs.
1950 * These might have permissive LIDs.
1951 */
1952 (is_direct(mad_hdr->mgmt_class) ||
1953 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1954 /* Verify request has not been canceled */
1955 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1956 }
1957 return NULL;
1958}
1959
1960void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1961{
1962 mad_send_wr->timeout = 0;
1963 if (mad_send_wr->refcount == 1)
1964 list_move_tail(&mad_send_wr->agent_list,
1965 &mad_send_wr->mad_agent_priv->done_list);
1966}
1967
1968static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1969 struct ib_mad_recv_wc *mad_recv_wc)
1970{
1971 struct ib_mad_send_wr_private *mad_send_wr;
1972 struct ib_mad_send_wc mad_send_wc;
1973 unsigned long flags;
1974 int ret;
1975
1976 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1977 ret = ib_mad_enforce_security(mad_agent_priv,
1978 mad_recv_wc->wc->pkey_index);
1979 if (ret) {
1980 ib_free_recv_mad(mad_recv_wc);
1981 deref_mad_agent(mad_agent_priv);
1982 return;
1983 }
1984
1985 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1986 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1987 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1988 mad_recv_wc);
1989 if (!mad_recv_wc) {
1990 deref_mad_agent(mad_agent_priv);
1991 return;
1992 }
1993 }
1994
1995 /* Complete corresponding request */
1996 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1997 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1998 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1999 if (!mad_send_wr) {
2000 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2001 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
2002 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
2003 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
2004 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
2005 /* user rmpp is in effect
2006 * and this is an active RMPP MAD
2007 */
2008 mad_agent_priv->agent.recv_handler(
2009 &mad_agent_priv->agent, NULL,
2010 mad_recv_wc);
2011 atomic_dec(&mad_agent_priv->refcount);
2012 } else {
2013 /* not user rmpp, revert to normal behavior and
2014 * drop the mad */
2015 ib_free_recv_mad(mad_recv_wc);
2016 deref_mad_agent(mad_agent_priv);
2017 return;
2018 }
2019 } else {
2020 ib_mark_mad_done(mad_send_wr);
2021 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2022
2023 /* Defined behavior is to complete response before request */
2024 mad_agent_priv->agent.recv_handler(
2025 &mad_agent_priv->agent,
2026 &mad_send_wr->send_buf,
2027 mad_recv_wc);
2028 atomic_dec(&mad_agent_priv->refcount);
2029
2030 mad_send_wc.status = IB_WC_SUCCESS;
2031 mad_send_wc.vendor_err = 0;
2032 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2033 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2034 }
2035 } else {
2036 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2037 mad_recv_wc);
2038 deref_mad_agent(mad_agent_priv);
2039 }
2040
2041 return;
2042}
2043
2044static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2045 const struct ib_mad_qp_info *qp_info,
2046 const struct ib_wc *wc,
2047 int port_num,
2048 struct ib_mad_private *recv,
2049 struct ib_mad_private *response)
2050{
2051 enum smi_forward_action retsmi;
2052 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2053
2054 if (smi_handle_dr_smp_recv(smp,
2055 rdma_cap_ib_switch(port_priv->device),
2056 port_num,
2057 port_priv->device->phys_port_cnt) ==
2058 IB_SMI_DISCARD)
2059 return IB_SMI_DISCARD;
2060
2061 retsmi = smi_check_forward_dr_smp(smp);
2062 if (retsmi == IB_SMI_LOCAL)
2063 return IB_SMI_HANDLE;
2064
2065 if (retsmi == IB_SMI_SEND) { /* don't forward */
2066 if (smi_handle_dr_smp_send(smp,
2067 rdma_cap_ib_switch(port_priv->device),
2068 port_num) == IB_SMI_DISCARD)
2069 return IB_SMI_DISCARD;
2070
2071 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2072 return IB_SMI_DISCARD;
2073 } else if (rdma_cap_ib_switch(port_priv->device)) {
2074 /* forward case for switches */
2075 memcpy(response, recv, mad_priv_size(response));
2076 response->header.recv_wc.wc = &response->header.wc;
2077 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2078 response->header.recv_wc.recv_buf.grh = &response->grh;
2079
2080 agent_send_response((const struct ib_mad_hdr *)response->mad,
2081 &response->grh, wc,
2082 port_priv->device,
2083 smi_get_fwd_port(smp),
2084 qp_info->qp->qp_num,
2085 response->mad_size,
2086 false);
2087
2088 return IB_SMI_DISCARD;
2089 }
2090 return IB_SMI_HANDLE;
2091}
2092
2093static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2094 struct ib_mad_private *response,
2095 size_t *resp_len, bool opa)
2096{
2097 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2098 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2099
2100 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2101 recv_hdr->method == IB_MGMT_METHOD_SET) {
2102 memcpy(response, recv, mad_priv_size(response));
2103 response->header.recv_wc.wc = &response->header.wc;
2104 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2105 response->header.recv_wc.recv_buf.grh = &response->grh;
2106 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2107 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2108 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2109 resp_hdr->status |= IB_SMP_DIRECTION;
2110
2111 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2112 if (recv_hdr->mgmt_class ==
2113 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2114 recv_hdr->mgmt_class ==
2115 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2116 *resp_len = opa_get_smp_header_size(
2117 (struct opa_smp *)recv->mad);
2118 else
2119 *resp_len = sizeof(struct ib_mad_hdr);
2120 }
2121
2122 return true;
2123 } else {
2124 return false;
2125 }
2126}
2127
2128static enum smi_action
2129handle_opa_smi(struct ib_mad_port_private *port_priv,
2130 struct ib_mad_qp_info *qp_info,
2131 struct ib_wc *wc,
2132 int port_num,
2133 struct ib_mad_private *recv,
2134 struct ib_mad_private *response)
2135{
2136 enum smi_forward_action retsmi;
2137 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2138
2139 if (opa_smi_handle_dr_smp_recv(smp,
2140 rdma_cap_ib_switch(port_priv->device),
2141 port_num,
2142 port_priv->device->phys_port_cnt) ==
2143 IB_SMI_DISCARD)
2144 return IB_SMI_DISCARD;
2145
2146 retsmi = opa_smi_check_forward_dr_smp(smp);
2147 if (retsmi == IB_SMI_LOCAL)
2148 return IB_SMI_HANDLE;
2149
2150 if (retsmi == IB_SMI_SEND) { /* don't forward */
2151 if (opa_smi_handle_dr_smp_send(smp,
2152 rdma_cap_ib_switch(port_priv->device),
2153 port_num) == IB_SMI_DISCARD)
2154 return IB_SMI_DISCARD;
2155
2156 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2157 IB_SMI_DISCARD)
2158 return IB_SMI_DISCARD;
2159
2160 } else if (rdma_cap_ib_switch(port_priv->device)) {
2161 /* forward case for switches */
2162 memcpy(response, recv, mad_priv_size(response));
2163 response->header.recv_wc.wc = &response->header.wc;
2164 response->header.recv_wc.recv_buf.opa_mad =
2165 (struct opa_mad *)response->mad;
2166 response->header.recv_wc.recv_buf.grh = &response->grh;
2167
2168 agent_send_response((const struct ib_mad_hdr *)response->mad,
2169 &response->grh, wc,
2170 port_priv->device,
2171 opa_smi_get_fwd_port(smp),
2172 qp_info->qp->qp_num,
2173 recv->header.wc.byte_len,
2174 true);
2175
2176 return IB_SMI_DISCARD;
2177 }
2178
2179 return IB_SMI_HANDLE;
2180}
2181
2182static enum smi_action
2183handle_smi(struct ib_mad_port_private *port_priv,
2184 struct ib_mad_qp_info *qp_info,
2185 struct ib_wc *wc,
2186 int port_num,
2187 struct ib_mad_private *recv,
2188 struct ib_mad_private *response,
2189 bool opa)
2190{
2191 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2192
2193 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2194 mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2195 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2196 response);
2197
2198 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2199}
2200
2201static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2202{
2203 struct ib_mad_port_private *port_priv = cq->cq_context;
2204 struct ib_mad_list_head *mad_list =
2205 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2206 struct ib_mad_qp_info *qp_info;
2207 struct ib_mad_private_header *mad_priv_hdr;
2208 struct ib_mad_private *recv, *response = NULL;
2209 struct ib_mad_agent_private *mad_agent;
2210 int port_num;
2211 int ret = IB_MAD_RESULT_SUCCESS;
2212 size_t mad_size;
2213 u16 resp_mad_pkey_index = 0;
2214 bool opa;
2215
2216 if (list_empty_careful(&port_priv->port_list))
2217 return;
2218
2219 if (wc->status != IB_WC_SUCCESS) {
2220 /*
2221 * Receive errors indicate that the QP has entered the error
2222 * state - error handling/shutdown code will cleanup
2223 */
2224 return;
2225 }
2226
2227 qp_info = mad_list->mad_queue->qp_info;
2228 dequeue_mad(mad_list);
2229
2230 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2231 qp_info->port_priv->port_num);
2232
2233 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2234 mad_list);
2235 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2236 ib_dma_unmap_single(port_priv->device,
2237 recv->header.mapping,
2238 mad_priv_dma_size(recv),
2239 DMA_FROM_DEVICE);
2240
2241 /* Setup MAD receive work completion from "normal" work completion */
2242 recv->header.wc = *wc;
2243 recv->header.recv_wc.wc = &recv->header.wc;
2244
2245 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2246 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2247 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2248 } else {
2249 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2250 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2251 }
2252
2253 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2254 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2255
2256 if (atomic_read(&qp_info->snoop_count))
2257 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2258
2259 /* Validate MAD */
2260 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2261 goto out;
2262
2263 mad_size = recv->mad_size;
2264 response = alloc_mad_private(mad_size, GFP_KERNEL);
2265 if (!response)
2266 goto out;
2267
2268 if (rdma_cap_ib_switch(port_priv->device))
2269 port_num = wc->port_num;
2270 else
2271 port_num = port_priv->port_num;
2272
2273 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2274 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2275 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2276 response, opa)
2277 == IB_SMI_DISCARD)
2278 goto out;
2279 }
2280
2281 /* Give driver "right of first refusal" on incoming MAD */
2282 if (port_priv->device->process_mad) {
2283 ret = port_priv->device->process_mad(port_priv->device, 0,
2284 port_priv->port_num,
2285 wc, &recv->grh,
2286 (const struct ib_mad_hdr *)recv->mad,
2287 recv->mad_size,
2288 (struct ib_mad_hdr *)response->mad,
2289 &mad_size, &resp_mad_pkey_index);
2290
2291 if (opa)
2292 wc->pkey_index = resp_mad_pkey_index;
2293
2294 if (ret & IB_MAD_RESULT_SUCCESS) {
2295 if (ret & IB_MAD_RESULT_CONSUMED)
2296 goto out;
2297 if (ret & IB_MAD_RESULT_REPLY) {
2298 agent_send_response((const struct ib_mad_hdr *)response->mad,
2299 &recv->grh, wc,
2300 port_priv->device,
2301 port_num,
2302 qp_info->qp->qp_num,
2303 mad_size, opa);
2304 goto out;
2305 }
2306 }
2307 }
2308
2309 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2310 if (mad_agent) {
2311 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2312 /*
2313 * recv is freed up in error cases in ib_mad_complete_recv
2314 * or via recv_handler in ib_mad_complete_recv()
2315 */
2316 recv = NULL;
2317 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2318 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2319 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2320 port_priv->device, port_num,
2321 qp_info->qp->qp_num, mad_size, opa);
2322 }
2323
2324out:
2325 /* Post another receive request for this QP */
2326 if (response) {
2327 ib_mad_post_receive_mads(qp_info, response);
2328 kfree(recv);
2329 } else
2330 ib_mad_post_receive_mads(qp_info, recv);
2331}
2332
2333static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2334{
2335 struct ib_mad_send_wr_private *mad_send_wr;
2336 unsigned long delay;
2337
2338 if (list_empty(&mad_agent_priv->wait_list)) {
2339 cancel_delayed_work(&mad_agent_priv->timed_work);
2340 } else {
2341 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2342 struct ib_mad_send_wr_private,
2343 agent_list);
2344
2345 if (time_after(mad_agent_priv->timeout,
2346 mad_send_wr->timeout)) {
2347 mad_agent_priv->timeout = mad_send_wr->timeout;
2348 delay = mad_send_wr->timeout - jiffies;
2349 if ((long)delay <= 0)
2350 delay = 1;
2351 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2352 &mad_agent_priv->timed_work, delay);
2353 }
2354 }
2355}
2356
2357static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2358{
2359 struct ib_mad_agent_private *mad_agent_priv;
2360 struct ib_mad_send_wr_private *temp_mad_send_wr;
2361 struct list_head *list_item;
2362 unsigned long delay;
2363
2364 mad_agent_priv = mad_send_wr->mad_agent_priv;
2365 list_del(&mad_send_wr->agent_list);
2366
2367 delay = mad_send_wr->timeout;
2368 mad_send_wr->timeout += jiffies;
2369
2370 if (delay) {
2371 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2372 temp_mad_send_wr = list_entry(list_item,
2373 struct ib_mad_send_wr_private,
2374 agent_list);
2375 if (time_after(mad_send_wr->timeout,
2376 temp_mad_send_wr->timeout))
2377 break;
2378 }
2379 }
2380 else
2381 list_item = &mad_agent_priv->wait_list;
2382 list_add(&mad_send_wr->agent_list, list_item);
2383
2384 /* Reschedule a work item if we have a shorter timeout */
2385 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2386 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2387 &mad_agent_priv->timed_work, delay);
2388}
2389
2390void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2391 int timeout_ms)
2392{
2393 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2394 wait_for_response(mad_send_wr);
2395}
2396
2397/*
2398 * Process a send work completion
2399 */
2400void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2401 struct ib_mad_send_wc *mad_send_wc)
2402{
2403 struct ib_mad_agent_private *mad_agent_priv;
2404 unsigned long flags;
2405 int ret;
2406
2407 mad_agent_priv = mad_send_wr->mad_agent_priv;
2408 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2409 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2410 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2411 if (ret == IB_RMPP_RESULT_CONSUMED)
2412 goto done;
2413 } else
2414 ret = IB_RMPP_RESULT_UNHANDLED;
2415
2416 if (mad_send_wc->status != IB_WC_SUCCESS &&
2417 mad_send_wr->status == IB_WC_SUCCESS) {
2418 mad_send_wr->status = mad_send_wc->status;
2419 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2420 }
2421
2422 if (--mad_send_wr->refcount > 0) {
2423 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2424 mad_send_wr->status == IB_WC_SUCCESS) {
2425 wait_for_response(mad_send_wr);
2426 }
2427 goto done;
2428 }
2429
2430 /* Remove send from MAD agent and notify client of completion */
2431 list_del(&mad_send_wr->agent_list);
2432 adjust_timeout(mad_agent_priv);
2433 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2434
2435 if (mad_send_wr->status != IB_WC_SUCCESS )
2436 mad_send_wc->status = mad_send_wr->status;
2437 if (ret == IB_RMPP_RESULT_INTERNAL)
2438 ib_rmpp_send_handler(mad_send_wc);
2439 else
2440 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2441 mad_send_wc);
2442
2443 /* Release reference on agent taken when sending */
2444 deref_mad_agent(mad_agent_priv);
2445 return;
2446done:
2447 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2448}
2449
2450static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2451{
2452 struct ib_mad_port_private *port_priv = cq->cq_context;
2453 struct ib_mad_list_head *mad_list =
2454 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2455 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2456 struct ib_mad_qp_info *qp_info;
2457 struct ib_mad_queue *send_queue;
2458 struct ib_send_wr *bad_send_wr;
2459 struct ib_mad_send_wc mad_send_wc;
2460 unsigned long flags;
2461 int ret;
2462
2463 if (list_empty_careful(&port_priv->port_list))
2464 return;
2465
2466 if (wc->status != IB_WC_SUCCESS) {
2467 if (!ib_mad_send_error(port_priv, wc))
2468 return;
2469 }
2470
2471 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2472 mad_list);
2473 send_queue = mad_list->mad_queue;
2474 qp_info = send_queue->qp_info;
2475
2476retry:
2477 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2478 mad_send_wr->header_mapping,
2479 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2480 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2481 mad_send_wr->payload_mapping,
2482 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2483 queued_send_wr = NULL;
2484 spin_lock_irqsave(&send_queue->lock, flags);
2485 list_del(&mad_list->list);
2486
2487 /* Move queued send to the send queue */
2488 if (send_queue->count-- > send_queue->max_active) {
2489 mad_list = container_of(qp_info->overflow_list.next,
2490 struct ib_mad_list_head, list);
2491 queued_send_wr = container_of(mad_list,
2492 struct ib_mad_send_wr_private,
2493 mad_list);
2494 list_move_tail(&mad_list->list, &send_queue->list);
2495 }
2496 spin_unlock_irqrestore(&send_queue->lock, flags);
2497
2498 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2499 mad_send_wc.status = wc->status;
2500 mad_send_wc.vendor_err = wc->vendor_err;
2501 if (atomic_read(&qp_info->snoop_count))
2502 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2503 IB_MAD_SNOOP_SEND_COMPLETIONS);
2504 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2505
2506 if (queued_send_wr) {
2507 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2508 &bad_send_wr);
2509 if (ret) {
2510 dev_err(&port_priv->device->dev,
2511 "ib_post_send failed: %d\n", ret);
2512 mad_send_wr = queued_send_wr;
2513 wc->status = IB_WC_LOC_QP_OP_ERR;
2514 goto retry;
2515 }
2516 }
2517}
2518
2519static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2520{
2521 struct ib_mad_send_wr_private *mad_send_wr;
2522 struct ib_mad_list_head *mad_list;
2523 unsigned long flags;
2524
2525 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2526 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2527 mad_send_wr = container_of(mad_list,
2528 struct ib_mad_send_wr_private,
2529 mad_list);
2530 mad_send_wr->retry = 1;
2531 }
2532 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2533}
2534
2535static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2536 struct ib_wc *wc)
2537{
2538 struct ib_mad_list_head *mad_list =
2539 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2540 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2541 struct ib_mad_send_wr_private *mad_send_wr;
2542 int ret;
2543
2544 /*
2545 * Send errors will transition the QP to SQE - move
2546 * QP to RTS and repost flushed work requests
2547 */
2548 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2549 mad_list);
2550 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2551 if (mad_send_wr->retry) {
2552 /* Repost send */
2553 struct ib_send_wr *bad_send_wr;
2554
2555 mad_send_wr->retry = 0;
2556 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2557 &bad_send_wr);
2558 if (!ret)
2559 return false;
2560 }
2561 } else {
2562 struct ib_qp_attr *attr;
2563
2564 /* Transition QP to RTS and fail offending send */
2565 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2566 if (attr) {
2567 attr->qp_state = IB_QPS_RTS;
2568 attr->cur_qp_state = IB_QPS_SQE;
2569 ret = ib_modify_qp(qp_info->qp, attr,
2570 IB_QP_STATE | IB_QP_CUR_STATE);
2571 kfree(attr);
2572 if (ret)
2573 dev_err(&port_priv->device->dev,
2574 "%s - ib_modify_qp to RTS: %d\n",
2575 __func__, ret);
2576 else
2577 mark_sends_for_retry(qp_info);
2578 }
2579 }
2580
2581 return true;
2582}
2583
2584static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2585{
2586 unsigned long flags;
2587 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2588 struct ib_mad_send_wc mad_send_wc;
2589 struct list_head cancel_list;
2590
2591 INIT_LIST_HEAD(&cancel_list);
2592
2593 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2594 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2595 &mad_agent_priv->send_list, agent_list) {
2596 if (mad_send_wr->status == IB_WC_SUCCESS) {
2597 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2598 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2599 }
2600 }
2601
2602 /* Empty wait list to prevent receives from finding a request */
2603 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2604 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2605
2606 /* Report all cancelled requests */
2607 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2608 mad_send_wc.vendor_err = 0;
2609
2610 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2611 &cancel_list, agent_list) {
2612 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2613 list_del(&mad_send_wr->agent_list);
2614 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2615 &mad_send_wc);
2616 atomic_dec(&mad_agent_priv->refcount);
2617 }
2618}
2619
2620static struct ib_mad_send_wr_private*
2621find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2622 struct ib_mad_send_buf *send_buf)
2623{
2624 struct ib_mad_send_wr_private *mad_send_wr;
2625
2626 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2627 agent_list) {
2628 if (&mad_send_wr->send_buf == send_buf)
2629 return mad_send_wr;
2630 }
2631
2632 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2633 agent_list) {
2634 if (is_rmpp_data_mad(mad_agent_priv,
2635 mad_send_wr->send_buf.mad) &&
2636 &mad_send_wr->send_buf == send_buf)
2637 return mad_send_wr;
2638 }
2639 return NULL;
2640}
2641
2642int ib_modify_mad(struct ib_mad_agent *mad_agent,
2643 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2644{
2645 struct ib_mad_agent_private *mad_agent_priv;
2646 struct ib_mad_send_wr_private *mad_send_wr;
2647 unsigned long flags;
2648 int active;
2649
2650 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2651 agent);
2652 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2653 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2654 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2655 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2656 return -EINVAL;
2657 }
2658
2659 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2660 if (!timeout_ms) {
2661 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2662 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2663 }
2664
2665 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2666 if (active)
2667 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2668 else
2669 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2670
2671 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2672 return 0;
2673}
2674EXPORT_SYMBOL(ib_modify_mad);
2675
2676void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2677 struct ib_mad_send_buf *send_buf)
2678{
2679 ib_modify_mad(mad_agent, send_buf, 0);
2680}
2681EXPORT_SYMBOL(ib_cancel_mad);
2682
2683static void local_completions(struct work_struct *work)
2684{
2685 struct ib_mad_agent_private *mad_agent_priv;
2686 struct ib_mad_local_private *local;
2687 struct ib_mad_agent_private *recv_mad_agent;
2688 unsigned long flags;
2689 int free_mad;
2690 struct ib_wc wc;
2691 struct ib_mad_send_wc mad_send_wc;
2692 bool opa;
2693
2694 mad_agent_priv =
2695 container_of(work, struct ib_mad_agent_private, local_work);
2696
2697 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2698 mad_agent_priv->qp_info->port_priv->port_num);
2699
2700 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2701 while (!list_empty(&mad_agent_priv->local_list)) {
2702 local = list_entry(mad_agent_priv->local_list.next,
2703 struct ib_mad_local_private,
2704 completion_list);
2705 list_del(&local->completion_list);
2706 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2707 free_mad = 0;
2708 if (local->mad_priv) {
2709 u8 base_version;
2710 recv_mad_agent = local->recv_mad_agent;
2711 if (!recv_mad_agent) {
2712 dev_err(&mad_agent_priv->agent.device->dev,
2713 "No receive MAD agent for local completion\n");
2714 free_mad = 1;
2715 goto local_send_completion;
2716 }
2717
2718 /*
2719 * Defined behavior is to complete response
2720 * before request
2721 */
2722 build_smp_wc(recv_mad_agent->agent.qp,
2723 local->mad_send_wr->send_wr.wr.wr_cqe,
2724 be16_to_cpu(IB_LID_PERMISSIVE),
2725 local->mad_send_wr->send_wr.pkey_index,
2726 recv_mad_agent->agent.port_num, &wc);
2727
2728 local->mad_priv->header.recv_wc.wc = &wc;
2729
2730 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2731 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2732 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2733 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2734 } else {
2735 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2736 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2737 }
2738
2739 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2740 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2741 &local->mad_priv->header.recv_wc.rmpp_list);
2742 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2743 local->mad_priv->header.recv_wc.recv_buf.mad =
2744 (struct ib_mad *)local->mad_priv->mad;
2745 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2746 snoop_recv(recv_mad_agent->qp_info,
2747 &local->mad_priv->header.recv_wc,
2748 IB_MAD_SNOOP_RECVS);
2749 recv_mad_agent->agent.recv_handler(
2750 &recv_mad_agent->agent,
2751 &local->mad_send_wr->send_buf,
2752 &local->mad_priv->header.recv_wc);
2753 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2754 atomic_dec(&recv_mad_agent->refcount);
2755 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2756 }
2757
2758local_send_completion:
2759 /* Complete send */
2760 mad_send_wc.status = IB_WC_SUCCESS;
2761 mad_send_wc.vendor_err = 0;
2762 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2763 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2764 snoop_send(mad_agent_priv->qp_info,
2765 &local->mad_send_wr->send_buf,
2766 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2767 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2768 &mad_send_wc);
2769
2770 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2771 atomic_dec(&mad_agent_priv->refcount);
2772 if (free_mad)
2773 kfree(local->mad_priv);
2774 kfree(local);
2775 }
2776 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2777}
2778
2779static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2780{
2781 int ret;
2782
2783 if (!mad_send_wr->retries_left)
2784 return -ETIMEDOUT;
2785
2786 mad_send_wr->retries_left--;
2787 mad_send_wr->send_buf.retries++;
2788
2789 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2790
2791 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2792 ret = ib_retry_rmpp(mad_send_wr);
2793 switch (ret) {
2794 case IB_RMPP_RESULT_UNHANDLED:
2795 ret = ib_send_mad(mad_send_wr);
2796 break;
2797 case IB_RMPP_RESULT_CONSUMED:
2798 ret = 0;
2799 break;
2800 default:
2801 ret = -ECOMM;
2802 break;
2803 }
2804 } else
2805 ret = ib_send_mad(mad_send_wr);
2806
2807 if (!ret) {
2808 mad_send_wr->refcount++;
2809 list_add_tail(&mad_send_wr->agent_list,
2810 &mad_send_wr->mad_agent_priv->send_list);
2811 }
2812 return ret;
2813}
2814
2815static void timeout_sends(struct work_struct *work)
2816{
2817 struct ib_mad_agent_private *mad_agent_priv;
2818 struct ib_mad_send_wr_private *mad_send_wr;
2819 struct ib_mad_send_wc mad_send_wc;
2820 unsigned long flags, delay;
2821
2822 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2823 timed_work.work);
2824 mad_send_wc.vendor_err = 0;
2825
2826 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2827 while (!list_empty(&mad_agent_priv->wait_list)) {
2828 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2829 struct ib_mad_send_wr_private,
2830 agent_list);
2831
2832 if (time_after(mad_send_wr->timeout, jiffies)) {
2833 delay = mad_send_wr->timeout - jiffies;
2834 if ((long)delay <= 0)
2835 delay = 1;
2836 queue_delayed_work(mad_agent_priv->qp_info->
2837 port_priv->wq,
2838 &mad_agent_priv->timed_work, delay);
2839 break;
2840 }
2841
2842 list_del(&mad_send_wr->agent_list);
2843 if (mad_send_wr->status == IB_WC_SUCCESS &&
2844 !retry_send(mad_send_wr))
2845 continue;
2846
2847 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2848
2849 if (mad_send_wr->status == IB_WC_SUCCESS)
2850 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2851 else
2852 mad_send_wc.status = mad_send_wr->status;
2853 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2854 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2855 &mad_send_wc);
2856
2857 atomic_dec(&mad_agent_priv->refcount);
2858 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2859 }
2860 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2861}
2862
2863/*
2864 * Allocate receive MADs and post receive WRs for them
2865 */
2866static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2867 struct ib_mad_private *mad)
2868{
2869 unsigned long flags;
2870 int post, ret;
2871 struct ib_mad_private *mad_priv;
2872 struct ib_sge sg_list;
2873 struct ib_recv_wr recv_wr, *bad_recv_wr;
2874 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2875
2876 /* Initialize common scatter list fields */
2877 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2878
2879 /* Initialize common receive WR fields */
2880 recv_wr.next = NULL;
2881 recv_wr.sg_list = &sg_list;
2882 recv_wr.num_sge = 1;
2883
2884 do {
2885 /* Allocate and map receive buffer */
2886 if (mad) {
2887 mad_priv = mad;
2888 mad = NULL;
2889 } else {
2890 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2891 GFP_ATOMIC);
2892 if (!mad_priv) {
2893 ret = -ENOMEM;
2894 break;
2895 }
2896 }
2897 sg_list.length = mad_priv_dma_size(mad_priv);
2898 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2899 &mad_priv->grh,
2900 mad_priv_dma_size(mad_priv),
2901 DMA_FROM_DEVICE);
2902 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2903 sg_list.addr))) {
2904 ret = -ENOMEM;
2905 break;
2906 }
2907 mad_priv->header.mapping = sg_list.addr;
2908 mad_priv->header.mad_list.mad_queue = recv_queue;
2909 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2910 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2911
2912 /* Post receive WR */
2913 spin_lock_irqsave(&recv_queue->lock, flags);
2914 post = (++recv_queue->count < recv_queue->max_active);
2915 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2916 spin_unlock_irqrestore(&recv_queue->lock, flags);
2917 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2918 if (ret) {
2919 spin_lock_irqsave(&recv_queue->lock, flags);
2920 list_del(&mad_priv->header.mad_list.list);
2921 recv_queue->count--;
2922 spin_unlock_irqrestore(&recv_queue->lock, flags);
2923 ib_dma_unmap_single(qp_info->port_priv->device,
2924 mad_priv->header.mapping,
2925 mad_priv_dma_size(mad_priv),
2926 DMA_FROM_DEVICE);
2927 kfree(mad_priv);
2928 dev_err(&qp_info->port_priv->device->dev,
2929 "ib_post_recv failed: %d\n", ret);
2930 break;
2931 }
2932 } while (post);
2933
2934 return ret;
2935}
2936
2937/*
2938 * Return all the posted receive MADs
2939 */
2940static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2941{
2942 struct ib_mad_private_header *mad_priv_hdr;
2943 struct ib_mad_private *recv;
2944 struct ib_mad_list_head *mad_list;
2945
2946 if (!qp_info->qp)
2947 return;
2948
2949 while (!list_empty(&qp_info->recv_queue.list)) {
2950
2951 mad_list = list_entry(qp_info->recv_queue.list.next,
2952 struct ib_mad_list_head, list);
2953 mad_priv_hdr = container_of(mad_list,
2954 struct ib_mad_private_header,
2955 mad_list);
2956 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2957 header);
2958
2959 /* Remove from posted receive MAD list */
2960 list_del(&mad_list->list);
2961
2962 ib_dma_unmap_single(qp_info->port_priv->device,
2963 recv->header.mapping,
2964 mad_priv_dma_size(recv),
2965 DMA_FROM_DEVICE);
2966 kfree(recv);
2967 }
2968
2969 qp_info->recv_queue.count = 0;
2970}
2971
2972/*
2973 * Start the port
2974 */
2975static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2976{
2977 int ret, i;
2978 struct ib_qp_attr *attr;
2979 struct ib_qp *qp;
2980 u16 pkey_index;
2981
2982 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2983 if (!attr)
2984 return -ENOMEM;
2985
2986 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2987 IB_DEFAULT_PKEY_FULL, &pkey_index);
2988 if (ret)
2989 pkey_index = 0;
2990
2991 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2992 qp = port_priv->qp_info[i].qp;
2993 if (!qp)
2994 continue;
2995
2996 /*
2997 * PKey index for QP1 is irrelevant but
2998 * one is needed for the Reset to Init transition
2999 */
3000 attr->qp_state = IB_QPS_INIT;
3001 attr->pkey_index = pkey_index;
3002 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3003 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3004 IB_QP_PKEY_INDEX | IB_QP_QKEY);
3005 if (ret) {
3006 dev_err(&port_priv->device->dev,
3007 "Couldn't change QP%d state to INIT: %d\n",
3008 i, ret);
3009 goto out;
3010 }
3011
3012 attr->qp_state = IB_QPS_RTR;
3013 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3014 if (ret) {
3015 dev_err(&port_priv->device->dev,
3016 "Couldn't change QP%d state to RTR: %d\n",
3017 i, ret);
3018 goto out;
3019 }
3020
3021 attr->qp_state = IB_QPS_RTS;
3022 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3023 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3024 if (ret) {
3025 dev_err(&port_priv->device->dev,
3026 "Couldn't change QP%d state to RTS: %d\n",
3027 i, ret);
3028 goto out;
3029 }
3030 }
3031
3032 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3033 if (ret) {
3034 dev_err(&port_priv->device->dev,
3035 "Failed to request completion notification: %d\n",
3036 ret);
3037 goto out;
3038 }
3039
3040 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3041 if (!port_priv->qp_info[i].qp)
3042 continue;
3043
3044 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3045 if (ret) {
3046 dev_err(&port_priv->device->dev,
3047 "Couldn't post receive WRs\n");
3048 goto out;
3049 }
3050 }
3051out:
3052 kfree(attr);
3053 return ret;
3054}
3055
3056static void qp_event_handler(struct ib_event *event, void *qp_context)
3057{
3058 struct ib_mad_qp_info *qp_info = qp_context;
3059
3060 /* It's worse than that! He's dead, Jim! */
3061 dev_err(&qp_info->port_priv->device->dev,
3062 "Fatal error (%d) on MAD QP (%d)\n",
3063 event->event, qp_info->qp->qp_num);
3064}
3065
3066static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3067 struct ib_mad_queue *mad_queue)
3068{
3069 mad_queue->qp_info = qp_info;
3070 mad_queue->count = 0;
3071 spin_lock_init(&mad_queue->lock);
3072 INIT_LIST_HEAD(&mad_queue->list);
3073}
3074
3075static void init_mad_qp(struct ib_mad_port_private *port_priv,
3076 struct ib_mad_qp_info *qp_info)
3077{
3078 qp_info->port_priv = port_priv;
3079 init_mad_queue(qp_info, &qp_info->send_queue);
3080 init_mad_queue(qp_info, &qp_info->recv_queue);
3081 INIT_LIST_HEAD(&qp_info->overflow_list);
3082 spin_lock_init(&qp_info->snoop_lock);
3083 qp_info->snoop_table = NULL;
3084 qp_info->snoop_table_size = 0;
3085 atomic_set(&qp_info->snoop_count, 0);
3086}
3087
3088static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3089 enum ib_qp_type qp_type)
3090{
3091 struct ib_qp_init_attr qp_init_attr;
3092 int ret;
3093
3094 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3095 qp_init_attr.send_cq = qp_info->port_priv->cq;
3096 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3097 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3098 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3099 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3100 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3101 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3102 qp_init_attr.qp_type = qp_type;
3103 qp_init_attr.port_num = qp_info->port_priv->port_num;
3104 qp_init_attr.qp_context = qp_info;
3105 qp_init_attr.event_handler = qp_event_handler;
3106 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3107 if (IS_ERR(qp_info->qp)) {
3108 dev_err(&qp_info->port_priv->device->dev,
3109 "Couldn't create ib_mad QP%d\n",
3110 get_spl_qp_index(qp_type));
3111 ret = PTR_ERR(qp_info->qp);
3112 goto error;
3113 }
3114 /* Use minimum queue sizes unless the CQ is resized */
3115 qp_info->send_queue.max_active = mad_sendq_size;
3116 qp_info->recv_queue.max_active = mad_recvq_size;
3117 return 0;
3118
3119error:
3120 return ret;
3121}
3122
3123static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3124{
3125 if (!qp_info->qp)
3126 return;
3127
3128 ib_destroy_qp(qp_info->qp);
3129 kfree(qp_info->snoop_table);
3130}
3131
3132/*
3133 * Open the port
3134 * Create the QP, PD, MR, and CQ if needed
3135 */
3136static int ib_mad_port_open(struct ib_device *device,
3137 int port_num)
3138{
3139 int ret, cq_size;
3140 struct ib_mad_port_private *port_priv;
3141 unsigned long flags;
3142 char name[sizeof "ib_mad123"];
3143 int has_smi;
3144
3145 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3146 return -EFAULT;
3147
3148 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3149 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3150 return -EFAULT;
3151
3152 /* Create new device info */
3153 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3154 if (!port_priv)
3155 return -ENOMEM;
3156
3157 port_priv->device = device;
3158 port_priv->port_num = port_num;
3159 spin_lock_init(&port_priv->reg_lock);
3160 INIT_LIST_HEAD(&port_priv->agent_list);
3161 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3162 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3163
3164 cq_size = mad_sendq_size + mad_recvq_size;
3165 has_smi = rdma_cap_ib_smi(device, port_num);
3166 if (has_smi)
3167 cq_size *= 2;
3168
3169 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3170 IB_POLL_WORKQUEUE);
3171 if (IS_ERR(port_priv->cq)) {
3172 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3173 ret = PTR_ERR(port_priv->cq);
3174 goto error3;
3175 }
3176
3177 port_priv->pd = ib_alloc_pd(device, 0);
3178 if (IS_ERR(port_priv->pd)) {
3179 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3180 ret = PTR_ERR(port_priv->pd);
3181 goto error4;
3182 }
3183
3184 if (has_smi) {
3185 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3186 if (ret)
3187 goto error6;
3188 }
3189 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3190 if (ret)
3191 goto error7;
3192
3193 snprintf(name, sizeof name, "ib_mad%d", port_num);
3194 port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3195 if (!port_priv->wq) {
3196 ret = -ENOMEM;
3197 goto error8;
3198 }
3199
3200 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3201 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3202 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3203
3204 ret = ib_mad_port_start(port_priv);
3205 if (ret) {
3206 dev_err(&device->dev, "Couldn't start port\n");
3207 goto error9;
3208 }
3209
3210 return 0;
3211
3212error9:
3213 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3214 list_del_init(&port_priv->port_list);
3215 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3216
3217 destroy_workqueue(port_priv->wq);
3218error8:
3219 destroy_mad_qp(&port_priv->qp_info[1]);
3220error7:
3221 destroy_mad_qp(&port_priv->qp_info[0]);
3222error6:
3223 ib_dealloc_pd(port_priv->pd);
3224error4:
3225 ib_free_cq(port_priv->cq);
3226 cleanup_recv_queue(&port_priv->qp_info[1]);
3227 cleanup_recv_queue(&port_priv->qp_info[0]);
3228error3:
3229 kfree(port_priv);
3230
3231 return ret;
3232}
3233
3234/*
3235 * Close the port
3236 * If there are no classes using the port, free the port
3237 * resources (CQ, MR, PD, QP) and remove the port's info structure
3238 */
3239static int ib_mad_port_close(struct ib_device *device, int port_num)
3240{
3241 struct ib_mad_port_private *port_priv;
3242 unsigned long flags;
3243
3244 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3245 port_priv = __ib_get_mad_port(device, port_num);
3246 if (port_priv == NULL) {
3247 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3248 dev_err(&device->dev, "Port %d not found\n", port_num);
3249 return -ENODEV;
3250 }
3251 list_del_init(&port_priv->port_list);
3252 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3253
3254 destroy_workqueue(port_priv->wq);
3255 destroy_mad_qp(&port_priv->qp_info[1]);
3256 destroy_mad_qp(&port_priv->qp_info[0]);
3257 ib_dealloc_pd(port_priv->pd);
3258 ib_free_cq(port_priv->cq);
3259 cleanup_recv_queue(&port_priv->qp_info[1]);
3260 cleanup_recv_queue(&port_priv->qp_info[0]);
3261 /* XXX: Handle deallocation of MAD registration tables */
3262
3263 kfree(port_priv);
3264
3265 return 0;
3266}
3267
3268static void ib_mad_init_device(struct ib_device *device)
3269{
3270 int start, i;
3271
3272 start = rdma_start_port(device);
3273
3274 for (i = start; i <= rdma_end_port(device); i++) {
3275 if (!rdma_cap_ib_mad(device, i))
3276 continue;
3277
3278 if (ib_mad_port_open(device, i)) {
3279 dev_err(&device->dev, "Couldn't open port %d\n", i);
3280 goto error;
3281 }
3282 if (ib_agent_port_open(device, i)) {
3283 dev_err(&device->dev,
3284 "Couldn't open port %d for agents\n", i);
3285 goto error_agent;
3286 }
3287 }
3288 return;
3289
3290error_agent:
3291 if (ib_mad_port_close(device, i))
3292 dev_err(&device->dev, "Couldn't close port %d\n", i);
3293
3294error:
3295 while (--i >= start) {
3296 if (!rdma_cap_ib_mad(device, i))
3297 continue;
3298
3299 if (ib_agent_port_close(device, i))
3300 dev_err(&device->dev,
3301 "Couldn't close port %d for agents\n", i);
3302 if (ib_mad_port_close(device, i))
3303 dev_err(&device->dev, "Couldn't close port %d\n", i);
3304 }
3305}
3306
3307static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3308{
3309 int i;
3310
3311 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3312 if (!rdma_cap_ib_mad(device, i))
3313 continue;
3314
3315 if (ib_agent_port_close(device, i))
3316 dev_err(&device->dev,
3317 "Couldn't close port %d for agents\n", i);
3318 if (ib_mad_port_close(device, i))
3319 dev_err(&device->dev, "Couldn't close port %d\n", i);
3320 }
3321}
3322
3323static struct ib_client mad_client = {
3324 .name = "mad",
3325 .add = ib_mad_init_device,
3326 .remove = ib_mad_remove_device
3327};
3328
3329int ib_mad_init(void)
3330{
3331 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3332 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3333
3334 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3335 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3336
3337 INIT_LIST_HEAD(&ib_mad_port_list);
3338
3339 if (ib_register_client(&mad_client)) {
3340 pr_err("Couldn't register ib_mad client\n");
3341 return -EINVAL;
3342 }
3343
3344 return 0;
3345}
3346
3347void ib_mad_cleanup(void)
3348{
3349 ib_unregister_client(&mad_client);
3350}