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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 <rdma/ib_cache.h>
44
45#include "mad_priv.h"
46#include "mad_rmpp.h"
47#include "smi.h"
48#include "opa_smi.h"
49#include "agent.h"
50
51MODULE_LICENSE("Dual BSD/GPL");
52MODULE_DESCRIPTION("kernel IB MAD API");
53MODULE_AUTHOR("Hal Rosenstock");
54MODULE_AUTHOR("Sean Hefty");
55
56static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
57static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
58
59module_param_named(send_queue_size, mad_sendq_size, int, 0444);
60MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
61module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
62MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
63
64static struct list_head ib_mad_port_list;
65static u32 ib_mad_client_id = 0;
66
67/* Port list lock */
68static DEFINE_SPINLOCK(ib_mad_port_list_lock);
69
70/* Forward declarations */
71static int method_in_use(struct ib_mad_mgmt_method_table **method,
72 struct ib_mad_reg_req *mad_reg_req);
73static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
74static struct ib_mad_agent_private *find_mad_agent(
75 struct ib_mad_port_private *port_priv,
76 const struct ib_mad_hdr *mad);
77static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
78 struct ib_mad_private *mad);
79static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
80static void timeout_sends(struct work_struct *work);
81static void local_completions(struct work_struct *work);
82static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv,
84 u8 mgmt_class);
85static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
86 struct ib_mad_agent_private *agent_priv);
87static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
88 struct ib_wc *wc);
89static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
90
91/*
92 * Returns a ib_mad_port_private structure or NULL for a device/port
93 * Assumes ib_mad_port_list_lock is being held
94 */
95static inline struct ib_mad_port_private *
96__ib_get_mad_port(struct ib_device *device, int port_num)
97{
98 struct ib_mad_port_private *entry;
99
100 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
101 if (entry->device == device && entry->port_num == port_num)
102 return entry;
103 }
104 return NULL;
105}
106
107/*
108 * Wrapper function to return a ib_mad_port_private structure or NULL
109 * for a device/port
110 */
111static inline struct ib_mad_port_private *
112ib_get_mad_port(struct ib_device *device, int port_num)
113{
114 struct ib_mad_port_private *entry;
115 unsigned long flags;
116
117 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
118 entry = __ib_get_mad_port(device, port_num);
119 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
120
121 return entry;
122}
123
124static inline u8 convert_mgmt_class(u8 mgmt_class)
125{
126 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
127 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
128 0 : mgmt_class;
129}
130
131static int get_spl_qp_index(enum ib_qp_type qp_type)
132{
133 switch (qp_type)
134 {
135 case IB_QPT_SMI:
136 return 0;
137 case IB_QPT_GSI:
138 return 1;
139 default:
140 return -1;
141 }
142}
143
144static int vendor_class_index(u8 mgmt_class)
145{
146 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
147}
148
149static int is_vendor_class(u8 mgmt_class)
150{
151 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
152 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
153 return 0;
154 return 1;
155}
156
157static int is_vendor_oui(char *oui)
158{
159 if (oui[0] || oui[1] || oui[2])
160 return 1;
161 return 0;
162}
163
164static int is_vendor_method_in_use(
165 struct ib_mad_mgmt_vendor_class *vendor_class,
166 struct ib_mad_reg_req *mad_reg_req)
167{
168 struct ib_mad_mgmt_method_table *method;
169 int i;
170
171 for (i = 0; i < MAX_MGMT_OUI; i++) {
172 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
173 method = vendor_class->method_table[i];
174 if (method) {
175 if (method_in_use(&method, mad_reg_req))
176 return 1;
177 else
178 break;
179 }
180 }
181 }
182 return 0;
183}
184
185int ib_response_mad(const struct ib_mad_hdr *hdr)
186{
187 return ((hdr->method & IB_MGMT_METHOD_RESP) ||
188 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
189 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
190 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
191}
192EXPORT_SYMBOL(ib_response_mad);
193
194/*
195 * ib_register_mad_agent - Register to send/receive MADs
196 */
197struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
198 u8 port_num,
199 enum ib_qp_type qp_type,
200 struct ib_mad_reg_req *mad_reg_req,
201 u8 rmpp_version,
202 ib_mad_send_handler send_handler,
203 ib_mad_recv_handler recv_handler,
204 void *context,
205 u32 registration_flags)
206{
207 struct ib_mad_port_private *port_priv;
208 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
209 struct ib_mad_agent_private *mad_agent_priv;
210 struct ib_mad_reg_req *reg_req = NULL;
211 struct ib_mad_mgmt_class_table *class;
212 struct ib_mad_mgmt_vendor_class_table *vendor;
213 struct ib_mad_mgmt_vendor_class *vendor_class;
214 struct ib_mad_mgmt_method_table *method;
215 int ret2, qpn;
216 unsigned long flags;
217 u8 mgmt_class, vclass;
218
219 /* Validate parameters */
220 qpn = get_spl_qp_index(qp_type);
221 if (qpn == -1) {
222 dev_notice(&device->dev,
223 "ib_register_mad_agent: invalid QP Type %d\n",
224 qp_type);
225 goto error1;
226 }
227
228 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
229 dev_notice(&device->dev,
230 "ib_register_mad_agent: invalid RMPP Version %u\n",
231 rmpp_version);
232 goto error1;
233 }
234
235 /* Validate MAD registration request if supplied */
236 if (mad_reg_req) {
237 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
238 dev_notice(&device->dev,
239 "ib_register_mad_agent: invalid Class Version %u\n",
240 mad_reg_req->mgmt_class_version);
241 goto error1;
242 }
243 if (!recv_handler) {
244 dev_notice(&device->dev,
245 "ib_register_mad_agent: no recv_handler\n");
246 goto error1;
247 }
248 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
249 /*
250 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
251 * one in this range currently allowed
252 */
253 if (mad_reg_req->mgmt_class !=
254 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
255 dev_notice(&device->dev,
256 "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
257 mad_reg_req->mgmt_class);
258 goto error1;
259 }
260 } else if (mad_reg_req->mgmt_class == 0) {
261 /*
262 * Class 0 is reserved in IBA and is used for
263 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
264 */
265 dev_notice(&device->dev,
266 "ib_register_mad_agent: Invalid Mgmt Class 0\n");
267 goto error1;
268 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
269 /*
270 * If class is in "new" vendor range,
271 * ensure supplied OUI is not zero
272 */
273 if (!is_vendor_oui(mad_reg_req->oui)) {
274 dev_notice(&device->dev,
275 "ib_register_mad_agent: No OUI specified for class 0x%x\n",
276 mad_reg_req->mgmt_class);
277 goto error1;
278 }
279 }
280 /* Make sure class supplied is consistent with RMPP */
281 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
282 if (rmpp_version) {
283 dev_notice(&device->dev,
284 "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
285 mad_reg_req->mgmt_class);
286 goto error1;
287 }
288 }
289
290 /* Make sure class supplied is consistent with QP type */
291 if (qp_type == IB_QPT_SMI) {
292 if ((mad_reg_req->mgmt_class !=
293 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
294 (mad_reg_req->mgmt_class !=
295 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
296 dev_notice(&device->dev,
297 "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
298 mad_reg_req->mgmt_class);
299 goto error1;
300 }
301 } else {
302 if ((mad_reg_req->mgmt_class ==
303 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
304 (mad_reg_req->mgmt_class ==
305 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
306 dev_notice(&device->dev,
307 "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
308 mad_reg_req->mgmt_class);
309 goto error1;
310 }
311 }
312 } else {
313 /* No registration request supplied */
314 if (!send_handler)
315 goto error1;
316 if (registration_flags & IB_MAD_USER_RMPP)
317 goto error1;
318 }
319
320 /* Validate device and port */
321 port_priv = ib_get_mad_port(device, port_num);
322 if (!port_priv) {
323 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
324 ret = ERR_PTR(-ENODEV);
325 goto error1;
326 }
327
328 /* Verify the QP requested is supported. For example, Ethernet devices
329 * will not have QP0 */
330 if (!port_priv->qp_info[qpn].qp) {
331 dev_notice(&device->dev,
332 "ib_register_mad_agent: QP %d not supported\n", qpn);
333 ret = ERR_PTR(-EPROTONOSUPPORT);
334 goto error1;
335 }
336
337 /* Allocate structures */
338 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
339 if (!mad_agent_priv) {
340 ret = ERR_PTR(-ENOMEM);
341 goto error1;
342 }
343
344 if (mad_reg_req) {
345 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
346 if (!reg_req) {
347 ret = ERR_PTR(-ENOMEM);
348 goto error3;
349 }
350 }
351
352 /* Now, fill in the various structures */
353 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
354 mad_agent_priv->reg_req = reg_req;
355 mad_agent_priv->agent.rmpp_version = rmpp_version;
356 mad_agent_priv->agent.device = device;
357 mad_agent_priv->agent.recv_handler = recv_handler;
358 mad_agent_priv->agent.send_handler = send_handler;
359 mad_agent_priv->agent.context = context;
360 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
361 mad_agent_priv->agent.port_num = port_num;
362 mad_agent_priv->agent.flags = registration_flags;
363 spin_lock_init(&mad_agent_priv->lock);
364 INIT_LIST_HEAD(&mad_agent_priv->send_list);
365 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
366 INIT_LIST_HEAD(&mad_agent_priv->done_list);
367 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
368 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
369 INIT_LIST_HEAD(&mad_agent_priv->local_list);
370 INIT_WORK(&mad_agent_priv->local_work, local_completions);
371 atomic_set(&mad_agent_priv->refcount, 1);
372 init_completion(&mad_agent_priv->comp);
373
374 spin_lock_irqsave(&port_priv->reg_lock, flags);
375 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
376
377 /*
378 * Make sure MAD registration (if supplied)
379 * is non overlapping with any existing ones
380 */
381 if (mad_reg_req) {
382 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
383 if (!is_vendor_class(mgmt_class)) {
384 class = port_priv->version[mad_reg_req->
385 mgmt_class_version].class;
386 if (class) {
387 method = class->method_table[mgmt_class];
388 if (method) {
389 if (method_in_use(&method,
390 mad_reg_req))
391 goto error4;
392 }
393 }
394 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
395 mgmt_class);
396 } else {
397 /* "New" vendor class range */
398 vendor = port_priv->version[mad_reg_req->
399 mgmt_class_version].vendor;
400 if (vendor) {
401 vclass = vendor_class_index(mgmt_class);
402 vendor_class = vendor->vendor_class[vclass];
403 if (vendor_class) {
404 if (is_vendor_method_in_use(
405 vendor_class,
406 mad_reg_req))
407 goto error4;
408 }
409 }
410 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
411 }
412 if (ret2) {
413 ret = ERR_PTR(ret2);
414 goto error4;
415 }
416 }
417
418 /* Add mad agent into port's agent list */
419 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
420 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
421
422 return &mad_agent_priv->agent;
423
424error4:
425 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
426 kfree(reg_req);
427error3:
428 kfree(mad_agent_priv);
429error1:
430 return ret;
431}
432EXPORT_SYMBOL(ib_register_mad_agent);
433
434static inline int is_snooping_sends(int mad_snoop_flags)
435{
436 return (mad_snoop_flags &
437 (/*IB_MAD_SNOOP_POSTED_SENDS |
438 IB_MAD_SNOOP_RMPP_SENDS |*/
439 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
440 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
441}
442
443static inline int is_snooping_recvs(int mad_snoop_flags)
444{
445 return (mad_snoop_flags &
446 (IB_MAD_SNOOP_RECVS /*|
447 IB_MAD_SNOOP_RMPP_RECVS*/));
448}
449
450static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
451 struct ib_mad_snoop_private *mad_snoop_priv)
452{
453 struct ib_mad_snoop_private **new_snoop_table;
454 unsigned long flags;
455 int i;
456
457 spin_lock_irqsave(&qp_info->snoop_lock, flags);
458 /* Check for empty slot in array. */
459 for (i = 0; i < qp_info->snoop_table_size; i++)
460 if (!qp_info->snoop_table[i])
461 break;
462
463 if (i == qp_info->snoop_table_size) {
464 /* Grow table. */
465 new_snoop_table = krealloc(qp_info->snoop_table,
466 sizeof mad_snoop_priv *
467 (qp_info->snoop_table_size + 1),
468 GFP_ATOMIC);
469 if (!new_snoop_table) {
470 i = -ENOMEM;
471 goto out;
472 }
473
474 qp_info->snoop_table = new_snoop_table;
475 qp_info->snoop_table_size++;
476 }
477 qp_info->snoop_table[i] = mad_snoop_priv;
478 atomic_inc(&qp_info->snoop_count);
479out:
480 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
481 return i;
482}
483
484struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
485 u8 port_num,
486 enum ib_qp_type qp_type,
487 int mad_snoop_flags,
488 ib_mad_snoop_handler snoop_handler,
489 ib_mad_recv_handler recv_handler,
490 void *context)
491{
492 struct ib_mad_port_private *port_priv;
493 struct ib_mad_agent *ret;
494 struct ib_mad_snoop_private *mad_snoop_priv;
495 int qpn;
496
497 /* Validate parameters */
498 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
499 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
500 ret = ERR_PTR(-EINVAL);
501 goto error1;
502 }
503 qpn = get_spl_qp_index(qp_type);
504 if (qpn == -1) {
505 ret = ERR_PTR(-EINVAL);
506 goto error1;
507 }
508 port_priv = ib_get_mad_port(device, port_num);
509 if (!port_priv) {
510 ret = ERR_PTR(-ENODEV);
511 goto error1;
512 }
513 /* Allocate structures */
514 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
515 if (!mad_snoop_priv) {
516 ret = ERR_PTR(-ENOMEM);
517 goto error1;
518 }
519
520 /* Now, fill in the various structures */
521 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
522 mad_snoop_priv->agent.device = device;
523 mad_snoop_priv->agent.recv_handler = recv_handler;
524 mad_snoop_priv->agent.snoop_handler = snoop_handler;
525 mad_snoop_priv->agent.context = context;
526 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
527 mad_snoop_priv->agent.port_num = port_num;
528 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
529 init_completion(&mad_snoop_priv->comp);
530 mad_snoop_priv->snoop_index = register_snoop_agent(
531 &port_priv->qp_info[qpn],
532 mad_snoop_priv);
533 if (mad_snoop_priv->snoop_index < 0) {
534 ret = ERR_PTR(mad_snoop_priv->snoop_index);
535 goto error2;
536 }
537
538 atomic_set(&mad_snoop_priv->refcount, 1);
539 return &mad_snoop_priv->agent;
540
541error2:
542 kfree(mad_snoop_priv);
543error1:
544 return ret;
545}
546EXPORT_SYMBOL(ib_register_mad_snoop);
547
548static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
549{
550 if (atomic_dec_and_test(&mad_agent_priv->refcount))
551 complete(&mad_agent_priv->comp);
552}
553
554static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
555{
556 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
557 complete(&mad_snoop_priv->comp);
558}
559
560static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
561{
562 struct ib_mad_port_private *port_priv;
563 unsigned long flags;
564
565 /* Note that we could still be handling received MADs */
566
567 /*
568 * Canceling all sends results in dropping received response
569 * MADs, preventing us from queuing additional work
570 */
571 cancel_mads(mad_agent_priv);
572 port_priv = mad_agent_priv->qp_info->port_priv;
573 cancel_delayed_work(&mad_agent_priv->timed_work);
574
575 spin_lock_irqsave(&port_priv->reg_lock, flags);
576 remove_mad_reg_req(mad_agent_priv);
577 list_del(&mad_agent_priv->agent_list);
578 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
579
580 flush_workqueue(port_priv->wq);
581 ib_cancel_rmpp_recvs(mad_agent_priv);
582
583 deref_mad_agent(mad_agent_priv);
584 wait_for_completion(&mad_agent_priv->comp);
585
586 kfree(mad_agent_priv->reg_req);
587 kfree(mad_agent_priv);
588}
589
590static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
591{
592 struct ib_mad_qp_info *qp_info;
593 unsigned long flags;
594
595 qp_info = mad_snoop_priv->qp_info;
596 spin_lock_irqsave(&qp_info->snoop_lock, flags);
597 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
598 atomic_dec(&qp_info->snoop_count);
599 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
600
601 deref_snoop_agent(mad_snoop_priv);
602 wait_for_completion(&mad_snoop_priv->comp);
603
604 kfree(mad_snoop_priv);
605}
606
607/*
608 * ib_unregister_mad_agent - Unregisters a client from using MAD services
609 */
610int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
611{
612 struct ib_mad_agent_private *mad_agent_priv;
613 struct ib_mad_snoop_private *mad_snoop_priv;
614
615 /* If the TID is zero, the agent can only snoop. */
616 if (mad_agent->hi_tid) {
617 mad_agent_priv = container_of(mad_agent,
618 struct ib_mad_agent_private,
619 agent);
620 unregister_mad_agent(mad_agent_priv);
621 } else {
622 mad_snoop_priv = container_of(mad_agent,
623 struct ib_mad_snoop_private,
624 agent);
625 unregister_mad_snoop(mad_snoop_priv);
626 }
627 return 0;
628}
629EXPORT_SYMBOL(ib_unregister_mad_agent);
630
631static void dequeue_mad(struct ib_mad_list_head *mad_list)
632{
633 struct ib_mad_queue *mad_queue;
634 unsigned long flags;
635
636 BUG_ON(!mad_list->mad_queue);
637 mad_queue = mad_list->mad_queue;
638 spin_lock_irqsave(&mad_queue->lock, flags);
639 list_del(&mad_list->list);
640 mad_queue->count--;
641 spin_unlock_irqrestore(&mad_queue->lock, flags);
642}
643
644static void snoop_send(struct ib_mad_qp_info *qp_info,
645 struct ib_mad_send_buf *send_buf,
646 struct ib_mad_send_wc *mad_send_wc,
647 int mad_snoop_flags)
648{
649 struct ib_mad_snoop_private *mad_snoop_priv;
650 unsigned long flags;
651 int i;
652
653 spin_lock_irqsave(&qp_info->snoop_lock, flags);
654 for (i = 0; i < qp_info->snoop_table_size; i++) {
655 mad_snoop_priv = qp_info->snoop_table[i];
656 if (!mad_snoop_priv ||
657 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
658 continue;
659
660 atomic_inc(&mad_snoop_priv->refcount);
661 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
662 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
663 send_buf, mad_send_wc);
664 deref_snoop_agent(mad_snoop_priv);
665 spin_lock_irqsave(&qp_info->snoop_lock, flags);
666 }
667 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
668}
669
670static void snoop_recv(struct ib_mad_qp_info *qp_info,
671 struct ib_mad_recv_wc *mad_recv_wc,
672 int mad_snoop_flags)
673{
674 struct ib_mad_snoop_private *mad_snoop_priv;
675 unsigned long flags;
676 int i;
677
678 spin_lock_irqsave(&qp_info->snoop_lock, flags);
679 for (i = 0; i < qp_info->snoop_table_size; i++) {
680 mad_snoop_priv = qp_info->snoop_table[i];
681 if (!mad_snoop_priv ||
682 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
683 continue;
684
685 atomic_inc(&mad_snoop_priv->refcount);
686 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
687 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
688 mad_recv_wc);
689 deref_snoop_agent(mad_snoop_priv);
690 spin_lock_irqsave(&qp_info->snoop_lock, flags);
691 }
692 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
693}
694
695static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
696 u16 pkey_index, u8 port_num, struct ib_wc *wc)
697{
698 memset(wc, 0, sizeof *wc);
699 wc->wr_cqe = cqe;
700 wc->status = IB_WC_SUCCESS;
701 wc->opcode = IB_WC_RECV;
702 wc->pkey_index = pkey_index;
703 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
704 wc->src_qp = IB_QP0;
705 wc->qp = qp;
706 wc->slid = slid;
707 wc->sl = 0;
708 wc->dlid_path_bits = 0;
709 wc->port_num = port_num;
710}
711
712static size_t mad_priv_size(const struct ib_mad_private *mp)
713{
714 return sizeof(struct ib_mad_private) + mp->mad_size;
715}
716
717static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
718{
719 size_t size = sizeof(struct ib_mad_private) + mad_size;
720 struct ib_mad_private *ret = kzalloc(size, flags);
721
722 if (ret)
723 ret->mad_size = mad_size;
724
725 return ret;
726}
727
728static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
729{
730 return rdma_max_mad_size(port_priv->device, port_priv->port_num);
731}
732
733static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
734{
735 return sizeof(struct ib_grh) + mp->mad_size;
736}
737
738/*
739 * Return 0 if SMP is to be sent
740 * Return 1 if SMP was consumed locally (whether or not solicited)
741 * Return < 0 if error
742 */
743static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
744 struct ib_mad_send_wr_private *mad_send_wr)
745{
746 int ret = 0;
747 struct ib_smp *smp = mad_send_wr->send_buf.mad;
748 struct opa_smp *opa_smp = (struct opa_smp *)smp;
749 unsigned long flags;
750 struct ib_mad_local_private *local;
751 struct ib_mad_private *mad_priv;
752 struct ib_mad_port_private *port_priv;
753 struct ib_mad_agent_private *recv_mad_agent = NULL;
754 struct ib_device *device = mad_agent_priv->agent.device;
755 u8 port_num;
756 struct ib_wc mad_wc;
757 struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
758 size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
759 u16 out_mad_pkey_index = 0;
760 u16 drslid;
761 bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
762 mad_agent_priv->qp_info->port_priv->port_num);
763
764 if (rdma_cap_ib_switch(device) &&
765 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
766 port_num = send_wr->port_num;
767 else
768 port_num = mad_agent_priv->agent.port_num;
769
770 /*
771 * Directed route handling starts if the initial LID routed part of
772 * a request or the ending LID routed part of a response is empty.
773 * If we are at the start of the LID routed part, don't update the
774 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
775 */
776 if (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
777 u32 opa_drslid;
778
779 if ((opa_get_smp_direction(opa_smp)
780 ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
781 OPA_LID_PERMISSIVE &&
782 opa_smi_handle_dr_smp_send(opa_smp,
783 rdma_cap_ib_switch(device),
784 port_num) == IB_SMI_DISCARD) {
785 ret = -EINVAL;
786 dev_err(&device->dev, "OPA Invalid directed route\n");
787 goto out;
788 }
789 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
790 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
791 opa_drslid & 0xffff0000) {
792 ret = -EINVAL;
793 dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
794 opa_drslid);
795 goto out;
796 }
797 drslid = (u16)(opa_drslid & 0x0000ffff);
798
799 /* Check to post send on QP or process locally */
800 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
801 opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
802 goto out;
803 } else {
804 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
805 IB_LID_PERMISSIVE &&
806 smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
807 IB_SMI_DISCARD) {
808 ret = -EINVAL;
809 dev_err(&device->dev, "Invalid directed route\n");
810 goto out;
811 }
812 drslid = be16_to_cpu(smp->dr_slid);
813
814 /* Check to post send on QP or process locally */
815 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
816 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
817 goto out;
818 }
819
820 local = kmalloc(sizeof *local, GFP_ATOMIC);
821 if (!local) {
822 ret = -ENOMEM;
823 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
824 goto out;
825 }
826 local->mad_priv = NULL;
827 local->recv_mad_agent = NULL;
828 mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
829 if (!mad_priv) {
830 ret = -ENOMEM;
831 dev_err(&device->dev, "No memory for local response MAD\n");
832 kfree(local);
833 goto out;
834 }
835
836 build_smp_wc(mad_agent_priv->agent.qp,
837 send_wr->wr.wr_cqe, drslid,
838 send_wr->pkey_index,
839 send_wr->port_num, &mad_wc);
840
841 if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
842 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
843 + mad_send_wr->send_buf.data_len
844 + sizeof(struct ib_grh);
845 }
846
847 /* No GRH for DR SMP */
848 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
849 (const struct ib_mad_hdr *)smp, mad_size,
850 (struct ib_mad_hdr *)mad_priv->mad,
851 &mad_size, &out_mad_pkey_index);
852 switch (ret)
853 {
854 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
855 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
856 mad_agent_priv->agent.recv_handler) {
857 local->mad_priv = mad_priv;
858 local->recv_mad_agent = mad_agent_priv;
859 /*
860 * Reference MAD agent until receive
861 * side of local completion handled
862 */
863 atomic_inc(&mad_agent_priv->refcount);
864 } else
865 kfree(mad_priv);
866 break;
867 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
868 kfree(mad_priv);
869 break;
870 case IB_MAD_RESULT_SUCCESS:
871 /* Treat like an incoming receive MAD */
872 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
873 mad_agent_priv->agent.port_num);
874 if (port_priv) {
875 memcpy(mad_priv->mad, smp, mad_priv->mad_size);
876 recv_mad_agent = find_mad_agent(port_priv,
877 (const struct ib_mad_hdr *)mad_priv->mad);
878 }
879 if (!port_priv || !recv_mad_agent) {
880 /*
881 * No receiving agent so drop packet and
882 * generate send completion.
883 */
884 kfree(mad_priv);
885 break;
886 }
887 local->mad_priv = mad_priv;
888 local->recv_mad_agent = recv_mad_agent;
889 break;
890 default:
891 kfree(mad_priv);
892 kfree(local);
893 ret = -EINVAL;
894 goto out;
895 }
896
897 local->mad_send_wr = mad_send_wr;
898 if (opa) {
899 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
900 local->return_wc_byte_len = mad_size;
901 }
902 /* Reference MAD agent until send side of local completion handled */
903 atomic_inc(&mad_agent_priv->refcount);
904 /* Queue local completion to local list */
905 spin_lock_irqsave(&mad_agent_priv->lock, flags);
906 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
907 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
908 queue_work(mad_agent_priv->qp_info->port_priv->wq,
909 &mad_agent_priv->local_work);
910 ret = 1;
911out:
912 return ret;
913}
914
915static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
916{
917 int seg_size, pad;
918
919 seg_size = mad_size - hdr_len;
920 if (data_len && seg_size) {
921 pad = seg_size - data_len % seg_size;
922 return pad == seg_size ? 0 : pad;
923 } else
924 return seg_size;
925}
926
927static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
928{
929 struct ib_rmpp_segment *s, *t;
930
931 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
932 list_del(&s->list);
933 kfree(s);
934 }
935}
936
937static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
938 size_t mad_size, gfp_t gfp_mask)
939{
940 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
941 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
942 struct ib_rmpp_segment *seg = NULL;
943 int left, seg_size, pad;
944
945 send_buf->seg_size = mad_size - send_buf->hdr_len;
946 send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
947 seg_size = send_buf->seg_size;
948 pad = send_wr->pad;
949
950 /* Allocate data segments. */
951 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
952 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
953 if (!seg) {
954 dev_err(&send_buf->mad_agent->device->dev,
955 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
956 sizeof (*seg) + seg_size, gfp_mask);
957 free_send_rmpp_list(send_wr);
958 return -ENOMEM;
959 }
960 seg->num = ++send_buf->seg_count;
961 list_add_tail(&seg->list, &send_wr->rmpp_list);
962 }
963
964 /* Zero any padding */
965 if (pad)
966 memset(seg->data + seg_size - pad, 0, pad);
967
968 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
969 agent.rmpp_version;
970 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
971 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
972
973 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
974 struct ib_rmpp_segment, list);
975 send_wr->last_ack_seg = send_wr->cur_seg;
976 return 0;
977}
978
979int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
980{
981 return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
982}
983EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
984
985struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
986 u32 remote_qpn, u16 pkey_index,
987 int rmpp_active,
988 int hdr_len, int data_len,
989 gfp_t gfp_mask,
990 u8 base_version)
991{
992 struct ib_mad_agent_private *mad_agent_priv;
993 struct ib_mad_send_wr_private *mad_send_wr;
994 int pad, message_size, ret, size;
995 void *buf;
996 size_t mad_size;
997 bool opa;
998
999 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1000 agent);
1001
1002 opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1003
1004 if (opa && base_version == OPA_MGMT_BASE_VERSION)
1005 mad_size = sizeof(struct opa_mad);
1006 else
1007 mad_size = sizeof(struct ib_mad);
1008
1009 pad = get_pad_size(hdr_len, data_len, mad_size);
1010 message_size = hdr_len + data_len + pad;
1011
1012 if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1013 if (!rmpp_active && message_size > mad_size)
1014 return ERR_PTR(-EINVAL);
1015 } else
1016 if (rmpp_active || message_size > mad_size)
1017 return ERR_PTR(-EINVAL);
1018
1019 size = rmpp_active ? hdr_len : mad_size;
1020 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1021 if (!buf)
1022 return ERR_PTR(-ENOMEM);
1023
1024 mad_send_wr = buf + size;
1025 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1026 mad_send_wr->send_buf.mad = buf;
1027 mad_send_wr->send_buf.hdr_len = hdr_len;
1028 mad_send_wr->send_buf.data_len = data_len;
1029 mad_send_wr->pad = pad;
1030
1031 mad_send_wr->mad_agent_priv = mad_agent_priv;
1032 mad_send_wr->sg_list[0].length = hdr_len;
1033 mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1034
1035 /* OPA MADs don't have to be the full 2048 bytes */
1036 if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1037 data_len < mad_size - hdr_len)
1038 mad_send_wr->sg_list[1].length = data_len;
1039 else
1040 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1041
1042 mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1043
1044 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1045
1046 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1047 mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1048 mad_send_wr->send_wr.wr.num_sge = 2;
1049 mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1050 mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1051 mad_send_wr->send_wr.remote_qpn = remote_qpn;
1052 mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1053 mad_send_wr->send_wr.pkey_index = pkey_index;
1054
1055 if (rmpp_active) {
1056 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1057 if (ret) {
1058 kfree(buf);
1059 return ERR_PTR(ret);
1060 }
1061 }
1062
1063 mad_send_wr->send_buf.mad_agent = mad_agent;
1064 atomic_inc(&mad_agent_priv->refcount);
1065 return &mad_send_wr->send_buf;
1066}
1067EXPORT_SYMBOL(ib_create_send_mad);
1068
1069int ib_get_mad_data_offset(u8 mgmt_class)
1070{
1071 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1072 return IB_MGMT_SA_HDR;
1073 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1074 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1075 (mgmt_class == IB_MGMT_CLASS_BIS))
1076 return IB_MGMT_DEVICE_HDR;
1077 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1078 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1079 return IB_MGMT_VENDOR_HDR;
1080 else
1081 return IB_MGMT_MAD_HDR;
1082}
1083EXPORT_SYMBOL(ib_get_mad_data_offset);
1084
1085int ib_is_mad_class_rmpp(u8 mgmt_class)
1086{
1087 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1088 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1089 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1090 (mgmt_class == IB_MGMT_CLASS_BIS) ||
1091 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1092 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1093 return 1;
1094 return 0;
1095}
1096EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1097
1098void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1099{
1100 struct ib_mad_send_wr_private *mad_send_wr;
1101 struct list_head *list;
1102
1103 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1104 send_buf);
1105 list = &mad_send_wr->cur_seg->list;
1106
1107 if (mad_send_wr->cur_seg->num < seg_num) {
1108 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1109 if (mad_send_wr->cur_seg->num == seg_num)
1110 break;
1111 } else if (mad_send_wr->cur_seg->num > seg_num) {
1112 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1113 if (mad_send_wr->cur_seg->num == seg_num)
1114 break;
1115 }
1116 return mad_send_wr->cur_seg->data;
1117}
1118EXPORT_SYMBOL(ib_get_rmpp_segment);
1119
1120static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1121{
1122 if (mad_send_wr->send_buf.seg_count)
1123 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1124 mad_send_wr->seg_num);
1125 else
1126 return mad_send_wr->send_buf.mad +
1127 mad_send_wr->send_buf.hdr_len;
1128}
1129
1130void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1131{
1132 struct ib_mad_agent_private *mad_agent_priv;
1133 struct ib_mad_send_wr_private *mad_send_wr;
1134
1135 mad_agent_priv = container_of(send_buf->mad_agent,
1136 struct ib_mad_agent_private, agent);
1137 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1138 send_buf);
1139
1140 free_send_rmpp_list(mad_send_wr);
1141 kfree(send_buf->mad);
1142 deref_mad_agent(mad_agent_priv);
1143}
1144EXPORT_SYMBOL(ib_free_send_mad);
1145
1146int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1147{
1148 struct ib_mad_qp_info *qp_info;
1149 struct list_head *list;
1150 struct ib_send_wr *bad_send_wr;
1151 struct ib_mad_agent *mad_agent;
1152 struct ib_sge *sge;
1153 unsigned long flags;
1154 int ret;
1155
1156 /* Set WR ID to find mad_send_wr upon completion */
1157 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1158 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1159 mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1160 mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1161
1162 mad_agent = mad_send_wr->send_buf.mad_agent;
1163 sge = mad_send_wr->sg_list;
1164 sge[0].addr = ib_dma_map_single(mad_agent->device,
1165 mad_send_wr->send_buf.mad,
1166 sge[0].length,
1167 DMA_TO_DEVICE);
1168 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1169 return -ENOMEM;
1170
1171 mad_send_wr->header_mapping = sge[0].addr;
1172
1173 sge[1].addr = ib_dma_map_single(mad_agent->device,
1174 ib_get_payload(mad_send_wr),
1175 sge[1].length,
1176 DMA_TO_DEVICE);
1177 if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1178 ib_dma_unmap_single(mad_agent->device,
1179 mad_send_wr->header_mapping,
1180 sge[0].length, DMA_TO_DEVICE);
1181 return -ENOMEM;
1182 }
1183 mad_send_wr->payload_mapping = sge[1].addr;
1184
1185 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1186 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1187 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1188 &bad_send_wr);
1189 list = &qp_info->send_queue.list;
1190 } else {
1191 ret = 0;
1192 list = &qp_info->overflow_list;
1193 }
1194
1195 if (!ret) {
1196 qp_info->send_queue.count++;
1197 list_add_tail(&mad_send_wr->mad_list.list, list);
1198 }
1199 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1200 if (ret) {
1201 ib_dma_unmap_single(mad_agent->device,
1202 mad_send_wr->header_mapping,
1203 sge[0].length, DMA_TO_DEVICE);
1204 ib_dma_unmap_single(mad_agent->device,
1205 mad_send_wr->payload_mapping,
1206 sge[1].length, DMA_TO_DEVICE);
1207 }
1208 return ret;
1209}
1210
1211/*
1212 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1213 * with the registered client
1214 */
1215int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1216 struct ib_mad_send_buf **bad_send_buf)
1217{
1218 struct ib_mad_agent_private *mad_agent_priv;
1219 struct ib_mad_send_buf *next_send_buf;
1220 struct ib_mad_send_wr_private *mad_send_wr;
1221 unsigned long flags;
1222 int ret = -EINVAL;
1223
1224 /* Walk list of send WRs and post each on send list */
1225 for (; send_buf; send_buf = next_send_buf) {
1226
1227 mad_send_wr = container_of(send_buf,
1228 struct ib_mad_send_wr_private,
1229 send_buf);
1230 mad_agent_priv = mad_send_wr->mad_agent_priv;
1231
1232 if (!send_buf->mad_agent->send_handler ||
1233 (send_buf->timeout_ms &&
1234 !send_buf->mad_agent->recv_handler)) {
1235 ret = -EINVAL;
1236 goto error;
1237 }
1238
1239 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1240 if (mad_agent_priv->agent.rmpp_version) {
1241 ret = -EINVAL;
1242 goto error;
1243 }
1244 }
1245
1246 /*
1247 * Save pointer to next work request to post in case the
1248 * current one completes, and the user modifies the work
1249 * request associated with the completion
1250 */
1251 next_send_buf = send_buf->next;
1252 mad_send_wr->send_wr.ah = send_buf->ah;
1253
1254 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1255 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1256 ret = handle_outgoing_dr_smp(mad_agent_priv,
1257 mad_send_wr);
1258 if (ret < 0) /* error */
1259 goto error;
1260 else if (ret == 1) /* locally consumed */
1261 continue;
1262 }
1263
1264 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1265 /* Timeout will be updated after send completes */
1266 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1267 mad_send_wr->max_retries = send_buf->retries;
1268 mad_send_wr->retries_left = send_buf->retries;
1269 send_buf->retries = 0;
1270 /* Reference for work request to QP + response */
1271 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1272 mad_send_wr->status = IB_WC_SUCCESS;
1273
1274 /* Reference MAD agent until send completes */
1275 atomic_inc(&mad_agent_priv->refcount);
1276 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1277 list_add_tail(&mad_send_wr->agent_list,
1278 &mad_agent_priv->send_list);
1279 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1280
1281 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1282 ret = ib_send_rmpp_mad(mad_send_wr);
1283 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1284 ret = ib_send_mad(mad_send_wr);
1285 } else
1286 ret = ib_send_mad(mad_send_wr);
1287 if (ret < 0) {
1288 /* Fail send request */
1289 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1290 list_del(&mad_send_wr->agent_list);
1291 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1292 atomic_dec(&mad_agent_priv->refcount);
1293 goto error;
1294 }
1295 }
1296 return 0;
1297error:
1298 if (bad_send_buf)
1299 *bad_send_buf = send_buf;
1300 return ret;
1301}
1302EXPORT_SYMBOL(ib_post_send_mad);
1303
1304/*
1305 * ib_free_recv_mad - Returns data buffers used to receive
1306 * a MAD to the access layer
1307 */
1308void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1309{
1310 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1311 struct ib_mad_private_header *mad_priv_hdr;
1312 struct ib_mad_private *priv;
1313 struct list_head free_list;
1314
1315 INIT_LIST_HEAD(&free_list);
1316 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1317
1318 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1319 &free_list, list) {
1320 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1321 recv_buf);
1322 mad_priv_hdr = container_of(mad_recv_wc,
1323 struct ib_mad_private_header,
1324 recv_wc);
1325 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1326 header);
1327 kfree(priv);
1328 }
1329}
1330EXPORT_SYMBOL(ib_free_recv_mad);
1331
1332struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1333 u8 rmpp_version,
1334 ib_mad_send_handler send_handler,
1335 ib_mad_recv_handler recv_handler,
1336 void *context)
1337{
1338 return ERR_PTR(-EINVAL); /* XXX: for now */
1339}
1340EXPORT_SYMBOL(ib_redirect_mad_qp);
1341
1342int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1343 struct ib_wc *wc)
1344{
1345 dev_err(&mad_agent->device->dev,
1346 "ib_process_mad_wc() not implemented yet\n");
1347 return 0;
1348}
1349EXPORT_SYMBOL(ib_process_mad_wc);
1350
1351static int method_in_use(struct ib_mad_mgmt_method_table **method,
1352 struct ib_mad_reg_req *mad_reg_req)
1353{
1354 int i;
1355
1356 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1357 if ((*method)->agent[i]) {
1358 pr_err("Method %d already in use\n", i);
1359 return -EINVAL;
1360 }
1361 }
1362 return 0;
1363}
1364
1365static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1366{
1367 /* Allocate management method table */
1368 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1369 if (!*method) {
1370 pr_err("No memory for ib_mad_mgmt_method_table\n");
1371 return -ENOMEM;
1372 }
1373
1374 return 0;
1375}
1376
1377/*
1378 * Check to see if there are any methods still in use
1379 */
1380static int check_method_table(struct ib_mad_mgmt_method_table *method)
1381{
1382 int i;
1383
1384 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1385 if (method->agent[i])
1386 return 1;
1387 return 0;
1388}
1389
1390/*
1391 * Check to see if there are any method tables for this class still in use
1392 */
1393static int check_class_table(struct ib_mad_mgmt_class_table *class)
1394{
1395 int i;
1396
1397 for (i = 0; i < MAX_MGMT_CLASS; i++)
1398 if (class->method_table[i])
1399 return 1;
1400 return 0;
1401}
1402
1403static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1404{
1405 int i;
1406
1407 for (i = 0; i < MAX_MGMT_OUI; i++)
1408 if (vendor_class->method_table[i])
1409 return 1;
1410 return 0;
1411}
1412
1413static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1414 const char *oui)
1415{
1416 int i;
1417
1418 for (i = 0; i < MAX_MGMT_OUI; i++)
1419 /* Is there matching OUI for this vendor class ? */
1420 if (!memcmp(vendor_class->oui[i], oui, 3))
1421 return i;
1422
1423 return -1;
1424}
1425
1426static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1427{
1428 int i;
1429
1430 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1431 if (vendor->vendor_class[i])
1432 return 1;
1433
1434 return 0;
1435}
1436
1437static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1438 struct ib_mad_agent_private *agent)
1439{
1440 int i;
1441
1442 /* Remove any methods for this mad agent */
1443 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1444 if (method->agent[i] == agent) {
1445 method->agent[i] = NULL;
1446 }
1447 }
1448}
1449
1450static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1451 struct ib_mad_agent_private *agent_priv,
1452 u8 mgmt_class)
1453{
1454 struct ib_mad_port_private *port_priv;
1455 struct ib_mad_mgmt_class_table **class;
1456 struct ib_mad_mgmt_method_table **method;
1457 int i, ret;
1458
1459 port_priv = agent_priv->qp_info->port_priv;
1460 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1461 if (!*class) {
1462 /* Allocate management class table for "new" class version */
1463 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1464 if (!*class) {
1465 dev_err(&agent_priv->agent.device->dev,
1466 "No memory for ib_mad_mgmt_class_table\n");
1467 ret = -ENOMEM;
1468 goto error1;
1469 }
1470
1471 /* Allocate method table for this management class */
1472 method = &(*class)->method_table[mgmt_class];
1473 if ((ret = allocate_method_table(method)))
1474 goto error2;
1475 } else {
1476 method = &(*class)->method_table[mgmt_class];
1477 if (!*method) {
1478 /* Allocate method table for this management class */
1479 if ((ret = allocate_method_table(method)))
1480 goto error1;
1481 }
1482 }
1483
1484 /* Now, make sure methods are not already in use */
1485 if (method_in_use(method, mad_reg_req))
1486 goto error3;
1487
1488 /* Finally, add in methods being registered */
1489 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1490 (*method)->agent[i] = agent_priv;
1491
1492 return 0;
1493
1494error3:
1495 /* Remove any methods for this mad agent */
1496 remove_methods_mad_agent(*method, agent_priv);
1497 /* Now, check to see if there are any methods in use */
1498 if (!check_method_table(*method)) {
1499 /* If not, release management method table */
1500 kfree(*method);
1501 *method = NULL;
1502 }
1503 ret = -EINVAL;
1504 goto error1;
1505error2:
1506 kfree(*class);
1507 *class = NULL;
1508error1:
1509 return ret;
1510}
1511
1512static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1513 struct ib_mad_agent_private *agent_priv)
1514{
1515 struct ib_mad_port_private *port_priv;
1516 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1517 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1518 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1519 struct ib_mad_mgmt_method_table **method;
1520 int i, ret = -ENOMEM;
1521 u8 vclass;
1522
1523 /* "New" vendor (with OUI) class */
1524 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1525 port_priv = agent_priv->qp_info->port_priv;
1526 vendor_table = &port_priv->version[
1527 mad_reg_req->mgmt_class_version].vendor;
1528 if (!*vendor_table) {
1529 /* Allocate mgmt vendor class table for "new" class version */
1530 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1531 if (!vendor) {
1532 dev_err(&agent_priv->agent.device->dev,
1533 "No memory for ib_mad_mgmt_vendor_class_table\n");
1534 goto error1;
1535 }
1536
1537 *vendor_table = vendor;
1538 }
1539 if (!(*vendor_table)->vendor_class[vclass]) {
1540 /* Allocate table for this management vendor class */
1541 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1542 if (!vendor_class) {
1543 dev_err(&agent_priv->agent.device->dev,
1544 "No memory for ib_mad_mgmt_vendor_class\n");
1545 goto error2;
1546 }
1547
1548 (*vendor_table)->vendor_class[vclass] = vendor_class;
1549 }
1550 for (i = 0; i < MAX_MGMT_OUI; i++) {
1551 /* Is there matching OUI for this vendor class ? */
1552 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1553 mad_reg_req->oui, 3)) {
1554 method = &(*vendor_table)->vendor_class[
1555 vclass]->method_table[i];
1556 BUG_ON(!*method);
1557 goto check_in_use;
1558 }
1559 }
1560 for (i = 0; i < MAX_MGMT_OUI; i++) {
1561 /* OUI slot available ? */
1562 if (!is_vendor_oui((*vendor_table)->vendor_class[
1563 vclass]->oui[i])) {
1564 method = &(*vendor_table)->vendor_class[
1565 vclass]->method_table[i];
1566 BUG_ON(*method);
1567 /* Allocate method table for this OUI */
1568 if ((ret = allocate_method_table(method)))
1569 goto error3;
1570 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1571 mad_reg_req->oui, 3);
1572 goto check_in_use;
1573 }
1574 }
1575 dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1576 goto error3;
1577
1578check_in_use:
1579 /* Now, make sure methods are not already in use */
1580 if (method_in_use(method, mad_reg_req))
1581 goto error4;
1582
1583 /* Finally, add in methods being registered */
1584 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1585 (*method)->agent[i] = agent_priv;
1586
1587 return 0;
1588
1589error4:
1590 /* Remove any methods for this mad agent */
1591 remove_methods_mad_agent(*method, agent_priv);
1592 /* Now, check to see if there are any methods in use */
1593 if (!check_method_table(*method)) {
1594 /* If not, release management method table */
1595 kfree(*method);
1596 *method = NULL;
1597 }
1598 ret = -EINVAL;
1599error3:
1600 if (vendor_class) {
1601 (*vendor_table)->vendor_class[vclass] = NULL;
1602 kfree(vendor_class);
1603 }
1604error2:
1605 if (vendor) {
1606 *vendor_table = NULL;
1607 kfree(vendor);
1608 }
1609error1:
1610 return ret;
1611}
1612
1613static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1614{
1615 struct ib_mad_port_private *port_priv;
1616 struct ib_mad_mgmt_class_table *class;
1617 struct ib_mad_mgmt_method_table *method;
1618 struct ib_mad_mgmt_vendor_class_table *vendor;
1619 struct ib_mad_mgmt_vendor_class *vendor_class;
1620 int index;
1621 u8 mgmt_class;
1622
1623 /*
1624 * Was MAD registration request supplied
1625 * with original registration ?
1626 */
1627 if (!agent_priv->reg_req) {
1628 goto out;
1629 }
1630
1631 port_priv = agent_priv->qp_info->port_priv;
1632 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1633 class = port_priv->version[
1634 agent_priv->reg_req->mgmt_class_version].class;
1635 if (!class)
1636 goto vendor_check;
1637
1638 method = class->method_table[mgmt_class];
1639 if (method) {
1640 /* Remove any methods for this mad agent */
1641 remove_methods_mad_agent(method, agent_priv);
1642 /* Now, check to see if there are any methods still in use */
1643 if (!check_method_table(method)) {
1644 /* If not, release management method table */
1645 kfree(method);
1646 class->method_table[mgmt_class] = NULL;
1647 /* Any management classes left ? */
1648 if (!check_class_table(class)) {
1649 /* If not, release management class table */
1650 kfree(class);
1651 port_priv->version[
1652 agent_priv->reg_req->
1653 mgmt_class_version].class = NULL;
1654 }
1655 }
1656 }
1657
1658vendor_check:
1659 if (!is_vendor_class(mgmt_class))
1660 goto out;
1661
1662 /* normalize mgmt_class to vendor range 2 */
1663 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1664 vendor = port_priv->version[
1665 agent_priv->reg_req->mgmt_class_version].vendor;
1666
1667 if (!vendor)
1668 goto out;
1669
1670 vendor_class = vendor->vendor_class[mgmt_class];
1671 if (vendor_class) {
1672 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1673 if (index < 0)
1674 goto out;
1675 method = vendor_class->method_table[index];
1676 if (method) {
1677 /* Remove any methods for this mad agent */
1678 remove_methods_mad_agent(method, agent_priv);
1679 /*
1680 * Now, check to see if there are
1681 * any methods still in use
1682 */
1683 if (!check_method_table(method)) {
1684 /* If not, release management method table */
1685 kfree(method);
1686 vendor_class->method_table[index] = NULL;
1687 memset(vendor_class->oui[index], 0, 3);
1688 /* Any OUIs left ? */
1689 if (!check_vendor_class(vendor_class)) {
1690 /* If not, release vendor class table */
1691 kfree(vendor_class);
1692 vendor->vendor_class[mgmt_class] = NULL;
1693 /* Any other vendor classes left ? */
1694 if (!check_vendor_table(vendor)) {
1695 kfree(vendor);
1696 port_priv->version[
1697 agent_priv->reg_req->
1698 mgmt_class_version].
1699 vendor = NULL;
1700 }
1701 }
1702 }
1703 }
1704 }
1705
1706out:
1707 return;
1708}
1709
1710static struct ib_mad_agent_private *
1711find_mad_agent(struct ib_mad_port_private *port_priv,
1712 const struct ib_mad_hdr *mad_hdr)
1713{
1714 struct ib_mad_agent_private *mad_agent = NULL;
1715 unsigned long flags;
1716
1717 spin_lock_irqsave(&port_priv->reg_lock, flags);
1718 if (ib_response_mad(mad_hdr)) {
1719 u32 hi_tid;
1720 struct ib_mad_agent_private *entry;
1721
1722 /*
1723 * Routing is based on high 32 bits of transaction ID
1724 * of MAD.
1725 */
1726 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1727 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1728 if (entry->agent.hi_tid == hi_tid) {
1729 mad_agent = entry;
1730 break;
1731 }
1732 }
1733 } else {
1734 struct ib_mad_mgmt_class_table *class;
1735 struct ib_mad_mgmt_method_table *method;
1736 struct ib_mad_mgmt_vendor_class_table *vendor;
1737 struct ib_mad_mgmt_vendor_class *vendor_class;
1738 const struct ib_vendor_mad *vendor_mad;
1739 int index;
1740
1741 /*
1742 * Routing is based on version, class, and method
1743 * For "newer" vendor MADs, also based on OUI
1744 */
1745 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1746 goto out;
1747 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1748 class = port_priv->version[
1749 mad_hdr->class_version].class;
1750 if (!class)
1751 goto out;
1752 if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1753 IB_MGMT_MAX_METHODS)
1754 goto out;
1755 method = class->method_table[convert_mgmt_class(
1756 mad_hdr->mgmt_class)];
1757 if (method)
1758 mad_agent = method->agent[mad_hdr->method &
1759 ~IB_MGMT_METHOD_RESP];
1760 } else {
1761 vendor = port_priv->version[
1762 mad_hdr->class_version].vendor;
1763 if (!vendor)
1764 goto out;
1765 vendor_class = vendor->vendor_class[vendor_class_index(
1766 mad_hdr->mgmt_class)];
1767 if (!vendor_class)
1768 goto out;
1769 /* Find matching OUI */
1770 vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1771 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1772 if (index == -1)
1773 goto out;
1774 method = vendor_class->method_table[index];
1775 if (method) {
1776 mad_agent = method->agent[mad_hdr->method &
1777 ~IB_MGMT_METHOD_RESP];
1778 }
1779 }
1780 }
1781
1782 if (mad_agent) {
1783 if (mad_agent->agent.recv_handler)
1784 atomic_inc(&mad_agent->refcount);
1785 else {
1786 dev_notice(&port_priv->device->dev,
1787 "No receive handler for client %p on port %d\n",
1788 &mad_agent->agent, port_priv->port_num);
1789 mad_agent = NULL;
1790 }
1791 }
1792out:
1793 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1794
1795 return mad_agent;
1796}
1797
1798static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1799 const struct ib_mad_qp_info *qp_info,
1800 bool opa)
1801{
1802 int valid = 0;
1803 u32 qp_num = qp_info->qp->qp_num;
1804
1805 /* Make sure MAD base version is understood */
1806 if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1807 (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1808 pr_err("MAD received with unsupported base version %d %s\n",
1809 mad_hdr->base_version, opa ? "(opa)" : "");
1810 goto out;
1811 }
1812
1813 /* Filter SMI packets sent to other than QP0 */
1814 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1815 (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1816 if (qp_num == 0)
1817 valid = 1;
1818 } else {
1819 /* CM attributes other than ClassPortInfo only use Send method */
1820 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1821 (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1822 (mad_hdr->method != IB_MGMT_METHOD_SEND))
1823 goto out;
1824 /* Filter GSI packets sent to QP0 */
1825 if (qp_num != 0)
1826 valid = 1;
1827 }
1828
1829out:
1830 return valid;
1831}
1832
1833static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1834 const struct ib_mad_hdr *mad_hdr)
1835{
1836 struct ib_rmpp_mad *rmpp_mad;
1837
1838 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1839 return !mad_agent_priv->agent.rmpp_version ||
1840 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1841 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1842 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1843 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1844}
1845
1846static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1847 const struct ib_mad_recv_wc *rwc)
1848{
1849 return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1850 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1851}
1852
1853static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1854 const struct ib_mad_send_wr_private *wr,
1855 const struct ib_mad_recv_wc *rwc )
1856{
1857 struct ib_ah_attr attr;
1858 u8 send_resp, rcv_resp;
1859 union ib_gid sgid;
1860 struct ib_device *device = mad_agent_priv->agent.device;
1861 u8 port_num = mad_agent_priv->agent.port_num;
1862 u8 lmc;
1863
1864 send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1865 rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1866
1867 if (send_resp == rcv_resp)
1868 /* both requests, or both responses. GIDs different */
1869 return 0;
1870
1871 if (ib_query_ah(wr->send_buf.ah, &attr))
1872 /* Assume not equal, to avoid false positives. */
1873 return 0;
1874
1875 if (!!(attr.ah_flags & IB_AH_GRH) !=
1876 !!(rwc->wc->wc_flags & IB_WC_GRH))
1877 /* one has GID, other does not. Assume different */
1878 return 0;
1879
1880 if (!send_resp && rcv_resp) {
1881 /* is request/response. */
1882 if (!(attr.ah_flags & IB_AH_GRH)) {
1883 if (ib_get_cached_lmc(device, port_num, &lmc))
1884 return 0;
1885 return (!lmc || !((attr.src_path_bits ^
1886 rwc->wc->dlid_path_bits) &
1887 ((1 << lmc) - 1)));
1888 } else {
1889 if (ib_get_cached_gid(device, port_num,
1890 attr.grh.sgid_index, &sgid, NULL))
1891 return 0;
1892 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1893 16);
1894 }
1895 }
1896
1897 if (!(attr.ah_flags & IB_AH_GRH))
1898 return attr.dlid == rwc->wc->slid;
1899 else
1900 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1901 16);
1902}
1903
1904static inline int is_direct(u8 class)
1905{
1906 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1907}
1908
1909struct ib_mad_send_wr_private*
1910ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1911 const struct ib_mad_recv_wc *wc)
1912{
1913 struct ib_mad_send_wr_private *wr;
1914 const struct ib_mad_hdr *mad_hdr;
1915
1916 mad_hdr = &wc->recv_buf.mad->mad_hdr;
1917
1918 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1919 if ((wr->tid == mad_hdr->tid) &&
1920 rcv_has_same_class(wr, wc) &&
1921 /*
1922 * Don't check GID for direct routed MADs.
1923 * These might have permissive LIDs.
1924 */
1925 (is_direct(mad_hdr->mgmt_class) ||
1926 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1927 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1928 }
1929
1930 /*
1931 * It's possible to receive the response before we've
1932 * been notified that the send has completed
1933 */
1934 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1935 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1936 wr->tid == mad_hdr->tid &&
1937 wr->timeout &&
1938 rcv_has_same_class(wr, wc) &&
1939 /*
1940 * Don't check GID for direct routed MADs.
1941 * These might have permissive LIDs.
1942 */
1943 (is_direct(mad_hdr->mgmt_class) ||
1944 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1945 /* Verify request has not been canceled */
1946 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1947 }
1948 return NULL;
1949}
1950
1951void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1952{
1953 mad_send_wr->timeout = 0;
1954 if (mad_send_wr->refcount == 1)
1955 list_move_tail(&mad_send_wr->agent_list,
1956 &mad_send_wr->mad_agent_priv->done_list);
1957}
1958
1959static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1960 struct ib_mad_recv_wc *mad_recv_wc)
1961{
1962 struct ib_mad_send_wr_private *mad_send_wr;
1963 struct ib_mad_send_wc mad_send_wc;
1964 unsigned long flags;
1965
1966 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1967 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1968 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1969 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1970 mad_recv_wc);
1971 if (!mad_recv_wc) {
1972 deref_mad_agent(mad_agent_priv);
1973 return;
1974 }
1975 }
1976
1977 /* Complete corresponding request */
1978 if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1979 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1980 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1981 if (!mad_send_wr) {
1982 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1983 if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1984 && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1985 && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1986 & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1987 /* user rmpp is in effect
1988 * and this is an active RMPP MAD
1989 */
1990 mad_agent_priv->agent.recv_handler(
1991 &mad_agent_priv->agent, NULL,
1992 mad_recv_wc);
1993 atomic_dec(&mad_agent_priv->refcount);
1994 } else {
1995 /* not user rmpp, revert to normal behavior and
1996 * drop the mad */
1997 ib_free_recv_mad(mad_recv_wc);
1998 deref_mad_agent(mad_agent_priv);
1999 return;
2000 }
2001 } else {
2002 ib_mark_mad_done(mad_send_wr);
2003 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2004
2005 /* Defined behavior is to complete response before request */
2006 mad_agent_priv->agent.recv_handler(
2007 &mad_agent_priv->agent,
2008 &mad_send_wr->send_buf,
2009 mad_recv_wc);
2010 atomic_dec(&mad_agent_priv->refcount);
2011
2012 mad_send_wc.status = IB_WC_SUCCESS;
2013 mad_send_wc.vendor_err = 0;
2014 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2015 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2016 }
2017 } else {
2018 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2019 mad_recv_wc);
2020 deref_mad_agent(mad_agent_priv);
2021 }
2022}
2023
2024static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2025 const struct ib_mad_qp_info *qp_info,
2026 const struct ib_wc *wc,
2027 int port_num,
2028 struct ib_mad_private *recv,
2029 struct ib_mad_private *response)
2030{
2031 enum smi_forward_action retsmi;
2032 struct ib_smp *smp = (struct ib_smp *)recv->mad;
2033
2034 if (smi_handle_dr_smp_recv(smp,
2035 rdma_cap_ib_switch(port_priv->device),
2036 port_num,
2037 port_priv->device->phys_port_cnt) ==
2038 IB_SMI_DISCARD)
2039 return IB_SMI_DISCARD;
2040
2041 retsmi = smi_check_forward_dr_smp(smp);
2042 if (retsmi == IB_SMI_LOCAL)
2043 return IB_SMI_HANDLE;
2044
2045 if (retsmi == IB_SMI_SEND) { /* don't forward */
2046 if (smi_handle_dr_smp_send(smp,
2047 rdma_cap_ib_switch(port_priv->device),
2048 port_num) == IB_SMI_DISCARD)
2049 return IB_SMI_DISCARD;
2050
2051 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2052 return IB_SMI_DISCARD;
2053 } else if (rdma_cap_ib_switch(port_priv->device)) {
2054 /* forward case for switches */
2055 memcpy(response, recv, mad_priv_size(response));
2056 response->header.recv_wc.wc = &response->header.wc;
2057 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2058 response->header.recv_wc.recv_buf.grh = &response->grh;
2059
2060 agent_send_response((const struct ib_mad_hdr *)response->mad,
2061 &response->grh, wc,
2062 port_priv->device,
2063 smi_get_fwd_port(smp),
2064 qp_info->qp->qp_num,
2065 response->mad_size,
2066 false);
2067
2068 return IB_SMI_DISCARD;
2069 }
2070 return IB_SMI_HANDLE;
2071}
2072
2073static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2074 struct ib_mad_private *response,
2075 size_t *resp_len, bool opa)
2076{
2077 const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2078 struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2079
2080 if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2081 recv_hdr->method == IB_MGMT_METHOD_SET) {
2082 memcpy(response, recv, mad_priv_size(response));
2083 response->header.recv_wc.wc = &response->header.wc;
2084 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2085 response->header.recv_wc.recv_buf.grh = &response->grh;
2086 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2087 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2088 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2089 resp_hdr->status |= IB_SMP_DIRECTION;
2090
2091 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2092 if (recv_hdr->mgmt_class ==
2093 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2094 recv_hdr->mgmt_class ==
2095 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2096 *resp_len = opa_get_smp_header_size(
2097 (struct opa_smp *)recv->mad);
2098 else
2099 *resp_len = sizeof(struct ib_mad_hdr);
2100 }
2101
2102 return true;
2103 } else {
2104 return false;
2105 }
2106}
2107
2108static enum smi_action
2109handle_opa_smi(struct ib_mad_port_private *port_priv,
2110 struct ib_mad_qp_info *qp_info,
2111 struct ib_wc *wc,
2112 int port_num,
2113 struct ib_mad_private *recv,
2114 struct ib_mad_private *response)
2115{
2116 enum smi_forward_action retsmi;
2117 struct opa_smp *smp = (struct opa_smp *)recv->mad;
2118
2119 if (opa_smi_handle_dr_smp_recv(smp,
2120 rdma_cap_ib_switch(port_priv->device),
2121 port_num,
2122 port_priv->device->phys_port_cnt) ==
2123 IB_SMI_DISCARD)
2124 return IB_SMI_DISCARD;
2125
2126 retsmi = opa_smi_check_forward_dr_smp(smp);
2127 if (retsmi == IB_SMI_LOCAL)
2128 return IB_SMI_HANDLE;
2129
2130 if (retsmi == IB_SMI_SEND) { /* don't forward */
2131 if (opa_smi_handle_dr_smp_send(smp,
2132 rdma_cap_ib_switch(port_priv->device),
2133 port_num) == IB_SMI_DISCARD)
2134 return IB_SMI_DISCARD;
2135
2136 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2137 IB_SMI_DISCARD)
2138 return IB_SMI_DISCARD;
2139
2140 } else if (rdma_cap_ib_switch(port_priv->device)) {
2141 /* forward case for switches */
2142 memcpy(response, recv, mad_priv_size(response));
2143 response->header.recv_wc.wc = &response->header.wc;
2144 response->header.recv_wc.recv_buf.opa_mad =
2145 (struct opa_mad *)response->mad;
2146 response->header.recv_wc.recv_buf.grh = &response->grh;
2147
2148 agent_send_response((const struct ib_mad_hdr *)response->mad,
2149 &response->grh, wc,
2150 port_priv->device,
2151 opa_smi_get_fwd_port(smp),
2152 qp_info->qp->qp_num,
2153 recv->header.wc.byte_len,
2154 true);
2155
2156 return IB_SMI_DISCARD;
2157 }
2158
2159 return IB_SMI_HANDLE;
2160}
2161
2162static enum smi_action
2163handle_smi(struct ib_mad_port_private *port_priv,
2164 struct ib_mad_qp_info *qp_info,
2165 struct ib_wc *wc,
2166 int port_num,
2167 struct ib_mad_private *recv,
2168 struct ib_mad_private *response,
2169 bool opa)
2170{
2171 struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2172
2173 if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2174 mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
2175 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2176 response);
2177
2178 return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2179}
2180
2181static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2182{
2183 struct ib_mad_port_private *port_priv = cq->cq_context;
2184 struct ib_mad_list_head *mad_list =
2185 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2186 struct ib_mad_qp_info *qp_info;
2187 struct ib_mad_private_header *mad_priv_hdr;
2188 struct ib_mad_private *recv, *response = NULL;
2189 struct ib_mad_agent_private *mad_agent;
2190 int port_num;
2191 int ret = IB_MAD_RESULT_SUCCESS;
2192 size_t mad_size;
2193 u16 resp_mad_pkey_index = 0;
2194 bool opa;
2195
2196 if (list_empty_careful(&port_priv->port_list))
2197 return;
2198
2199 if (wc->status != IB_WC_SUCCESS) {
2200 /*
2201 * Receive errors indicate that the QP has entered the error
2202 * state - error handling/shutdown code will cleanup
2203 */
2204 return;
2205 }
2206
2207 qp_info = mad_list->mad_queue->qp_info;
2208 dequeue_mad(mad_list);
2209
2210 opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2211 qp_info->port_priv->port_num);
2212
2213 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2214 mad_list);
2215 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2216 ib_dma_unmap_single(port_priv->device,
2217 recv->header.mapping,
2218 mad_priv_dma_size(recv),
2219 DMA_FROM_DEVICE);
2220
2221 /* Setup MAD receive work completion from "normal" work completion */
2222 recv->header.wc = *wc;
2223 recv->header.recv_wc.wc = &recv->header.wc;
2224
2225 if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2226 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2227 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2228 } else {
2229 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2230 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2231 }
2232
2233 recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2234 recv->header.recv_wc.recv_buf.grh = &recv->grh;
2235
2236 if (atomic_read(&qp_info->snoop_count))
2237 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2238
2239 /* Validate MAD */
2240 if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2241 goto out;
2242
2243 mad_size = recv->mad_size;
2244 response = alloc_mad_private(mad_size, GFP_KERNEL);
2245 if (!response) {
2246 dev_err(&port_priv->device->dev,
2247 "%s: no memory for response buffer\n", __func__);
2248 goto out;
2249 }
2250
2251 if (rdma_cap_ib_switch(port_priv->device))
2252 port_num = wc->port_num;
2253 else
2254 port_num = port_priv->port_num;
2255
2256 if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2257 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2258 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2259 response, opa)
2260 == IB_SMI_DISCARD)
2261 goto out;
2262 }
2263
2264 /* Give driver "right of first refusal" on incoming MAD */
2265 if (port_priv->device->process_mad) {
2266 ret = port_priv->device->process_mad(port_priv->device, 0,
2267 port_priv->port_num,
2268 wc, &recv->grh,
2269 (const struct ib_mad_hdr *)recv->mad,
2270 recv->mad_size,
2271 (struct ib_mad_hdr *)response->mad,
2272 &mad_size, &resp_mad_pkey_index);
2273
2274 if (opa)
2275 wc->pkey_index = resp_mad_pkey_index;
2276
2277 if (ret & IB_MAD_RESULT_SUCCESS) {
2278 if (ret & IB_MAD_RESULT_CONSUMED)
2279 goto out;
2280 if (ret & IB_MAD_RESULT_REPLY) {
2281 agent_send_response((const struct ib_mad_hdr *)response->mad,
2282 &recv->grh, wc,
2283 port_priv->device,
2284 port_num,
2285 qp_info->qp->qp_num,
2286 mad_size, opa);
2287 goto out;
2288 }
2289 }
2290 }
2291
2292 mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2293 if (mad_agent) {
2294 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2295 /*
2296 * recv is freed up in error cases in ib_mad_complete_recv
2297 * or via recv_handler in ib_mad_complete_recv()
2298 */
2299 recv = NULL;
2300 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2301 generate_unmatched_resp(recv, response, &mad_size, opa)) {
2302 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2303 port_priv->device, port_num,
2304 qp_info->qp->qp_num, mad_size, opa);
2305 }
2306
2307out:
2308 /* Post another receive request for this QP */
2309 if (response) {
2310 ib_mad_post_receive_mads(qp_info, response);
2311 kfree(recv);
2312 } else
2313 ib_mad_post_receive_mads(qp_info, recv);
2314}
2315
2316static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2317{
2318 struct ib_mad_send_wr_private *mad_send_wr;
2319 unsigned long delay;
2320
2321 if (list_empty(&mad_agent_priv->wait_list)) {
2322 cancel_delayed_work(&mad_agent_priv->timed_work);
2323 } else {
2324 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2325 struct ib_mad_send_wr_private,
2326 agent_list);
2327
2328 if (time_after(mad_agent_priv->timeout,
2329 mad_send_wr->timeout)) {
2330 mad_agent_priv->timeout = mad_send_wr->timeout;
2331 delay = mad_send_wr->timeout - jiffies;
2332 if ((long)delay <= 0)
2333 delay = 1;
2334 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2335 &mad_agent_priv->timed_work, delay);
2336 }
2337 }
2338}
2339
2340static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2341{
2342 struct ib_mad_agent_private *mad_agent_priv;
2343 struct ib_mad_send_wr_private *temp_mad_send_wr;
2344 struct list_head *list_item;
2345 unsigned long delay;
2346
2347 mad_agent_priv = mad_send_wr->mad_agent_priv;
2348 list_del(&mad_send_wr->agent_list);
2349
2350 delay = mad_send_wr->timeout;
2351 mad_send_wr->timeout += jiffies;
2352
2353 if (delay) {
2354 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2355 temp_mad_send_wr = list_entry(list_item,
2356 struct ib_mad_send_wr_private,
2357 agent_list);
2358 if (time_after(mad_send_wr->timeout,
2359 temp_mad_send_wr->timeout))
2360 break;
2361 }
2362 }
2363 else
2364 list_item = &mad_agent_priv->wait_list;
2365 list_add(&mad_send_wr->agent_list, list_item);
2366
2367 /* Reschedule a work item if we have a shorter timeout */
2368 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2369 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2370 &mad_agent_priv->timed_work, delay);
2371}
2372
2373void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2374 int timeout_ms)
2375{
2376 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2377 wait_for_response(mad_send_wr);
2378}
2379
2380/*
2381 * Process a send work completion
2382 */
2383void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2384 struct ib_mad_send_wc *mad_send_wc)
2385{
2386 struct ib_mad_agent_private *mad_agent_priv;
2387 unsigned long flags;
2388 int ret;
2389
2390 mad_agent_priv = mad_send_wr->mad_agent_priv;
2391 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2392 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2393 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2394 if (ret == IB_RMPP_RESULT_CONSUMED)
2395 goto done;
2396 } else
2397 ret = IB_RMPP_RESULT_UNHANDLED;
2398
2399 if (mad_send_wc->status != IB_WC_SUCCESS &&
2400 mad_send_wr->status == IB_WC_SUCCESS) {
2401 mad_send_wr->status = mad_send_wc->status;
2402 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2403 }
2404
2405 if (--mad_send_wr->refcount > 0) {
2406 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2407 mad_send_wr->status == IB_WC_SUCCESS) {
2408 wait_for_response(mad_send_wr);
2409 }
2410 goto done;
2411 }
2412
2413 /* Remove send from MAD agent and notify client of completion */
2414 list_del(&mad_send_wr->agent_list);
2415 adjust_timeout(mad_agent_priv);
2416 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2417
2418 if (mad_send_wr->status != IB_WC_SUCCESS )
2419 mad_send_wc->status = mad_send_wr->status;
2420 if (ret == IB_RMPP_RESULT_INTERNAL)
2421 ib_rmpp_send_handler(mad_send_wc);
2422 else
2423 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2424 mad_send_wc);
2425
2426 /* Release reference on agent taken when sending */
2427 deref_mad_agent(mad_agent_priv);
2428 return;
2429done:
2430 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2431}
2432
2433static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2434{
2435 struct ib_mad_port_private *port_priv = cq->cq_context;
2436 struct ib_mad_list_head *mad_list =
2437 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2438 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2439 struct ib_mad_qp_info *qp_info;
2440 struct ib_mad_queue *send_queue;
2441 struct ib_send_wr *bad_send_wr;
2442 struct ib_mad_send_wc mad_send_wc;
2443 unsigned long flags;
2444 int ret;
2445
2446 if (list_empty_careful(&port_priv->port_list))
2447 return;
2448
2449 if (wc->status != IB_WC_SUCCESS) {
2450 if (!ib_mad_send_error(port_priv, wc))
2451 return;
2452 }
2453
2454 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2455 mad_list);
2456 send_queue = mad_list->mad_queue;
2457 qp_info = send_queue->qp_info;
2458
2459retry:
2460 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2461 mad_send_wr->header_mapping,
2462 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2463 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2464 mad_send_wr->payload_mapping,
2465 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2466 queued_send_wr = NULL;
2467 spin_lock_irqsave(&send_queue->lock, flags);
2468 list_del(&mad_list->list);
2469
2470 /* Move queued send to the send queue */
2471 if (send_queue->count-- > send_queue->max_active) {
2472 mad_list = container_of(qp_info->overflow_list.next,
2473 struct ib_mad_list_head, list);
2474 queued_send_wr = container_of(mad_list,
2475 struct ib_mad_send_wr_private,
2476 mad_list);
2477 list_move_tail(&mad_list->list, &send_queue->list);
2478 }
2479 spin_unlock_irqrestore(&send_queue->lock, flags);
2480
2481 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2482 mad_send_wc.status = wc->status;
2483 mad_send_wc.vendor_err = wc->vendor_err;
2484 if (atomic_read(&qp_info->snoop_count))
2485 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2486 IB_MAD_SNOOP_SEND_COMPLETIONS);
2487 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2488
2489 if (queued_send_wr) {
2490 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2491 &bad_send_wr);
2492 if (ret) {
2493 dev_err(&port_priv->device->dev,
2494 "ib_post_send failed: %d\n", ret);
2495 mad_send_wr = queued_send_wr;
2496 wc->status = IB_WC_LOC_QP_OP_ERR;
2497 goto retry;
2498 }
2499 }
2500}
2501
2502static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2503{
2504 struct ib_mad_send_wr_private *mad_send_wr;
2505 struct ib_mad_list_head *mad_list;
2506 unsigned long flags;
2507
2508 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2509 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2510 mad_send_wr = container_of(mad_list,
2511 struct ib_mad_send_wr_private,
2512 mad_list);
2513 mad_send_wr->retry = 1;
2514 }
2515 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2516}
2517
2518static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2519 struct ib_wc *wc)
2520{
2521 struct ib_mad_list_head *mad_list =
2522 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2523 struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2524 struct ib_mad_send_wr_private *mad_send_wr;
2525 int ret;
2526
2527 /*
2528 * Send errors will transition the QP to SQE - move
2529 * QP to RTS and repost flushed work requests
2530 */
2531 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2532 mad_list);
2533 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2534 if (mad_send_wr->retry) {
2535 /* Repost send */
2536 struct ib_send_wr *bad_send_wr;
2537
2538 mad_send_wr->retry = 0;
2539 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2540 &bad_send_wr);
2541 if (!ret)
2542 return false;
2543 }
2544 } else {
2545 struct ib_qp_attr *attr;
2546
2547 /* Transition QP to RTS and fail offending send */
2548 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2549 if (attr) {
2550 attr->qp_state = IB_QPS_RTS;
2551 attr->cur_qp_state = IB_QPS_SQE;
2552 ret = ib_modify_qp(qp_info->qp, attr,
2553 IB_QP_STATE | IB_QP_CUR_STATE);
2554 kfree(attr);
2555 if (ret)
2556 dev_err(&port_priv->device->dev,
2557 "%s - ib_modify_qp to RTS: %d\n",
2558 __func__, ret);
2559 else
2560 mark_sends_for_retry(qp_info);
2561 }
2562 }
2563
2564 return true;
2565}
2566
2567static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2568{
2569 unsigned long flags;
2570 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2571 struct ib_mad_send_wc mad_send_wc;
2572 struct list_head cancel_list;
2573
2574 INIT_LIST_HEAD(&cancel_list);
2575
2576 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2577 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2578 &mad_agent_priv->send_list, agent_list) {
2579 if (mad_send_wr->status == IB_WC_SUCCESS) {
2580 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2581 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2582 }
2583 }
2584
2585 /* Empty wait list to prevent receives from finding a request */
2586 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2587 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2588
2589 /* Report all cancelled requests */
2590 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2591 mad_send_wc.vendor_err = 0;
2592
2593 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2594 &cancel_list, agent_list) {
2595 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2596 list_del(&mad_send_wr->agent_list);
2597 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2598 &mad_send_wc);
2599 atomic_dec(&mad_agent_priv->refcount);
2600 }
2601}
2602
2603static struct ib_mad_send_wr_private*
2604find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2605 struct ib_mad_send_buf *send_buf)
2606{
2607 struct ib_mad_send_wr_private *mad_send_wr;
2608
2609 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2610 agent_list) {
2611 if (&mad_send_wr->send_buf == send_buf)
2612 return mad_send_wr;
2613 }
2614
2615 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2616 agent_list) {
2617 if (is_rmpp_data_mad(mad_agent_priv,
2618 mad_send_wr->send_buf.mad) &&
2619 &mad_send_wr->send_buf == send_buf)
2620 return mad_send_wr;
2621 }
2622 return NULL;
2623}
2624
2625int ib_modify_mad(struct ib_mad_agent *mad_agent,
2626 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2627{
2628 struct ib_mad_agent_private *mad_agent_priv;
2629 struct ib_mad_send_wr_private *mad_send_wr;
2630 unsigned long flags;
2631 int active;
2632
2633 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2634 agent);
2635 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2636 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2637 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2638 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2639 return -EINVAL;
2640 }
2641
2642 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2643 if (!timeout_ms) {
2644 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2645 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2646 }
2647
2648 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2649 if (active)
2650 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2651 else
2652 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2653
2654 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2655 return 0;
2656}
2657EXPORT_SYMBOL(ib_modify_mad);
2658
2659void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2660 struct ib_mad_send_buf *send_buf)
2661{
2662 ib_modify_mad(mad_agent, send_buf, 0);
2663}
2664EXPORT_SYMBOL(ib_cancel_mad);
2665
2666static void local_completions(struct work_struct *work)
2667{
2668 struct ib_mad_agent_private *mad_agent_priv;
2669 struct ib_mad_local_private *local;
2670 struct ib_mad_agent_private *recv_mad_agent;
2671 unsigned long flags;
2672 int free_mad;
2673 struct ib_wc wc;
2674 struct ib_mad_send_wc mad_send_wc;
2675 bool opa;
2676
2677 mad_agent_priv =
2678 container_of(work, struct ib_mad_agent_private, local_work);
2679
2680 opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2681 mad_agent_priv->qp_info->port_priv->port_num);
2682
2683 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2684 while (!list_empty(&mad_agent_priv->local_list)) {
2685 local = list_entry(mad_agent_priv->local_list.next,
2686 struct ib_mad_local_private,
2687 completion_list);
2688 list_del(&local->completion_list);
2689 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2690 free_mad = 0;
2691 if (local->mad_priv) {
2692 u8 base_version;
2693 recv_mad_agent = local->recv_mad_agent;
2694 if (!recv_mad_agent) {
2695 dev_err(&mad_agent_priv->agent.device->dev,
2696 "No receive MAD agent for local completion\n");
2697 free_mad = 1;
2698 goto local_send_completion;
2699 }
2700
2701 /*
2702 * Defined behavior is to complete response
2703 * before request
2704 */
2705 build_smp_wc(recv_mad_agent->agent.qp,
2706 local->mad_send_wr->send_wr.wr.wr_cqe,
2707 be16_to_cpu(IB_LID_PERMISSIVE),
2708 local->mad_send_wr->send_wr.pkey_index,
2709 recv_mad_agent->agent.port_num, &wc);
2710
2711 local->mad_priv->header.recv_wc.wc = &wc;
2712
2713 base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2714 if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2715 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2716 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2717 } else {
2718 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2719 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2720 }
2721
2722 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2723 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2724 &local->mad_priv->header.recv_wc.rmpp_list);
2725 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2726 local->mad_priv->header.recv_wc.recv_buf.mad =
2727 (struct ib_mad *)local->mad_priv->mad;
2728 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2729 snoop_recv(recv_mad_agent->qp_info,
2730 &local->mad_priv->header.recv_wc,
2731 IB_MAD_SNOOP_RECVS);
2732 recv_mad_agent->agent.recv_handler(
2733 &recv_mad_agent->agent,
2734 &local->mad_send_wr->send_buf,
2735 &local->mad_priv->header.recv_wc);
2736 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2737 atomic_dec(&recv_mad_agent->refcount);
2738 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2739 }
2740
2741local_send_completion:
2742 /* Complete send */
2743 mad_send_wc.status = IB_WC_SUCCESS;
2744 mad_send_wc.vendor_err = 0;
2745 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2746 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2747 snoop_send(mad_agent_priv->qp_info,
2748 &local->mad_send_wr->send_buf,
2749 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2750 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2751 &mad_send_wc);
2752
2753 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2754 atomic_dec(&mad_agent_priv->refcount);
2755 if (free_mad)
2756 kfree(local->mad_priv);
2757 kfree(local);
2758 }
2759 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2760}
2761
2762static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2763{
2764 int ret;
2765
2766 if (!mad_send_wr->retries_left)
2767 return -ETIMEDOUT;
2768
2769 mad_send_wr->retries_left--;
2770 mad_send_wr->send_buf.retries++;
2771
2772 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2773
2774 if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2775 ret = ib_retry_rmpp(mad_send_wr);
2776 switch (ret) {
2777 case IB_RMPP_RESULT_UNHANDLED:
2778 ret = ib_send_mad(mad_send_wr);
2779 break;
2780 case IB_RMPP_RESULT_CONSUMED:
2781 ret = 0;
2782 break;
2783 default:
2784 ret = -ECOMM;
2785 break;
2786 }
2787 } else
2788 ret = ib_send_mad(mad_send_wr);
2789
2790 if (!ret) {
2791 mad_send_wr->refcount++;
2792 list_add_tail(&mad_send_wr->agent_list,
2793 &mad_send_wr->mad_agent_priv->send_list);
2794 }
2795 return ret;
2796}
2797
2798static void timeout_sends(struct work_struct *work)
2799{
2800 struct ib_mad_agent_private *mad_agent_priv;
2801 struct ib_mad_send_wr_private *mad_send_wr;
2802 struct ib_mad_send_wc mad_send_wc;
2803 unsigned long flags, delay;
2804
2805 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2806 timed_work.work);
2807 mad_send_wc.vendor_err = 0;
2808
2809 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2810 while (!list_empty(&mad_agent_priv->wait_list)) {
2811 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2812 struct ib_mad_send_wr_private,
2813 agent_list);
2814
2815 if (time_after(mad_send_wr->timeout, jiffies)) {
2816 delay = mad_send_wr->timeout - jiffies;
2817 if ((long)delay <= 0)
2818 delay = 1;
2819 queue_delayed_work(mad_agent_priv->qp_info->
2820 port_priv->wq,
2821 &mad_agent_priv->timed_work, delay);
2822 break;
2823 }
2824
2825 list_del(&mad_send_wr->agent_list);
2826 if (mad_send_wr->status == IB_WC_SUCCESS &&
2827 !retry_send(mad_send_wr))
2828 continue;
2829
2830 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2831
2832 if (mad_send_wr->status == IB_WC_SUCCESS)
2833 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2834 else
2835 mad_send_wc.status = mad_send_wr->status;
2836 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2837 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2838 &mad_send_wc);
2839
2840 atomic_dec(&mad_agent_priv->refcount);
2841 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2842 }
2843 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2844}
2845
2846/*
2847 * Allocate receive MADs and post receive WRs for them
2848 */
2849static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2850 struct ib_mad_private *mad)
2851{
2852 unsigned long flags;
2853 int post, ret;
2854 struct ib_mad_private *mad_priv;
2855 struct ib_sge sg_list;
2856 struct ib_recv_wr recv_wr, *bad_recv_wr;
2857 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2858
2859 /* Initialize common scatter list fields */
2860 sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2861
2862 /* Initialize common receive WR fields */
2863 recv_wr.next = NULL;
2864 recv_wr.sg_list = &sg_list;
2865 recv_wr.num_sge = 1;
2866
2867 do {
2868 /* Allocate and map receive buffer */
2869 if (mad) {
2870 mad_priv = mad;
2871 mad = NULL;
2872 } else {
2873 mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2874 GFP_ATOMIC);
2875 if (!mad_priv) {
2876 dev_err(&qp_info->port_priv->device->dev,
2877 "No memory for receive buffer\n");
2878 ret = -ENOMEM;
2879 break;
2880 }
2881 }
2882 sg_list.length = mad_priv_dma_size(mad_priv);
2883 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2884 &mad_priv->grh,
2885 mad_priv_dma_size(mad_priv),
2886 DMA_FROM_DEVICE);
2887 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2888 sg_list.addr))) {
2889 ret = -ENOMEM;
2890 break;
2891 }
2892 mad_priv->header.mapping = sg_list.addr;
2893 mad_priv->header.mad_list.mad_queue = recv_queue;
2894 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2895 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2896
2897 /* Post receive WR */
2898 spin_lock_irqsave(&recv_queue->lock, flags);
2899 post = (++recv_queue->count < recv_queue->max_active);
2900 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2901 spin_unlock_irqrestore(&recv_queue->lock, flags);
2902 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2903 if (ret) {
2904 spin_lock_irqsave(&recv_queue->lock, flags);
2905 list_del(&mad_priv->header.mad_list.list);
2906 recv_queue->count--;
2907 spin_unlock_irqrestore(&recv_queue->lock, flags);
2908 ib_dma_unmap_single(qp_info->port_priv->device,
2909 mad_priv->header.mapping,
2910 mad_priv_dma_size(mad_priv),
2911 DMA_FROM_DEVICE);
2912 kfree(mad_priv);
2913 dev_err(&qp_info->port_priv->device->dev,
2914 "ib_post_recv failed: %d\n", ret);
2915 break;
2916 }
2917 } while (post);
2918
2919 return ret;
2920}
2921
2922/*
2923 * Return all the posted receive MADs
2924 */
2925static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2926{
2927 struct ib_mad_private_header *mad_priv_hdr;
2928 struct ib_mad_private *recv;
2929 struct ib_mad_list_head *mad_list;
2930
2931 if (!qp_info->qp)
2932 return;
2933
2934 while (!list_empty(&qp_info->recv_queue.list)) {
2935
2936 mad_list = list_entry(qp_info->recv_queue.list.next,
2937 struct ib_mad_list_head, list);
2938 mad_priv_hdr = container_of(mad_list,
2939 struct ib_mad_private_header,
2940 mad_list);
2941 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2942 header);
2943
2944 /* Remove from posted receive MAD list */
2945 list_del(&mad_list->list);
2946
2947 ib_dma_unmap_single(qp_info->port_priv->device,
2948 recv->header.mapping,
2949 mad_priv_dma_size(recv),
2950 DMA_FROM_DEVICE);
2951 kfree(recv);
2952 }
2953
2954 qp_info->recv_queue.count = 0;
2955}
2956
2957/*
2958 * Start the port
2959 */
2960static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2961{
2962 int ret, i;
2963 struct ib_qp_attr *attr;
2964 struct ib_qp *qp;
2965 u16 pkey_index;
2966
2967 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2968 if (!attr) {
2969 dev_err(&port_priv->device->dev,
2970 "Couldn't kmalloc ib_qp_attr\n");
2971 return -ENOMEM;
2972 }
2973
2974 ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2975 IB_DEFAULT_PKEY_FULL, &pkey_index);
2976 if (ret)
2977 pkey_index = 0;
2978
2979 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2980 qp = port_priv->qp_info[i].qp;
2981 if (!qp)
2982 continue;
2983
2984 /*
2985 * PKey index for QP1 is irrelevant but
2986 * one is needed for the Reset to Init transition
2987 */
2988 attr->qp_state = IB_QPS_INIT;
2989 attr->pkey_index = pkey_index;
2990 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2991 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2992 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2993 if (ret) {
2994 dev_err(&port_priv->device->dev,
2995 "Couldn't change QP%d state to INIT: %d\n",
2996 i, ret);
2997 goto out;
2998 }
2999
3000 attr->qp_state = IB_QPS_RTR;
3001 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3002 if (ret) {
3003 dev_err(&port_priv->device->dev,
3004 "Couldn't change QP%d state to RTR: %d\n",
3005 i, ret);
3006 goto out;
3007 }
3008
3009 attr->qp_state = IB_QPS_RTS;
3010 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3011 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3012 if (ret) {
3013 dev_err(&port_priv->device->dev,
3014 "Couldn't change QP%d state to RTS: %d\n",
3015 i, ret);
3016 goto out;
3017 }
3018 }
3019
3020 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3021 if (ret) {
3022 dev_err(&port_priv->device->dev,
3023 "Failed to request completion notification: %d\n",
3024 ret);
3025 goto out;
3026 }
3027
3028 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3029 if (!port_priv->qp_info[i].qp)
3030 continue;
3031
3032 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3033 if (ret) {
3034 dev_err(&port_priv->device->dev,
3035 "Couldn't post receive WRs\n");
3036 goto out;
3037 }
3038 }
3039out:
3040 kfree(attr);
3041 return ret;
3042}
3043
3044static void qp_event_handler(struct ib_event *event, void *qp_context)
3045{
3046 struct ib_mad_qp_info *qp_info = qp_context;
3047
3048 /* It's worse than that! He's dead, Jim! */
3049 dev_err(&qp_info->port_priv->device->dev,
3050 "Fatal error (%d) on MAD QP (%d)\n",
3051 event->event, qp_info->qp->qp_num);
3052}
3053
3054static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3055 struct ib_mad_queue *mad_queue)
3056{
3057 mad_queue->qp_info = qp_info;
3058 mad_queue->count = 0;
3059 spin_lock_init(&mad_queue->lock);
3060 INIT_LIST_HEAD(&mad_queue->list);
3061}
3062
3063static void init_mad_qp(struct ib_mad_port_private *port_priv,
3064 struct ib_mad_qp_info *qp_info)
3065{
3066 qp_info->port_priv = port_priv;
3067 init_mad_queue(qp_info, &qp_info->send_queue);
3068 init_mad_queue(qp_info, &qp_info->recv_queue);
3069 INIT_LIST_HEAD(&qp_info->overflow_list);
3070 spin_lock_init(&qp_info->snoop_lock);
3071 qp_info->snoop_table = NULL;
3072 qp_info->snoop_table_size = 0;
3073 atomic_set(&qp_info->snoop_count, 0);
3074}
3075
3076static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3077 enum ib_qp_type qp_type)
3078{
3079 struct ib_qp_init_attr qp_init_attr;
3080 int ret;
3081
3082 memset(&qp_init_attr, 0, sizeof qp_init_attr);
3083 qp_init_attr.send_cq = qp_info->port_priv->cq;
3084 qp_init_attr.recv_cq = qp_info->port_priv->cq;
3085 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3086 qp_init_attr.cap.max_send_wr = mad_sendq_size;
3087 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3088 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3089 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3090 qp_init_attr.qp_type = qp_type;
3091 qp_init_attr.port_num = qp_info->port_priv->port_num;
3092 qp_init_attr.qp_context = qp_info;
3093 qp_init_attr.event_handler = qp_event_handler;
3094 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3095 if (IS_ERR(qp_info->qp)) {
3096 dev_err(&qp_info->port_priv->device->dev,
3097 "Couldn't create ib_mad QP%d\n",
3098 get_spl_qp_index(qp_type));
3099 ret = PTR_ERR(qp_info->qp);
3100 goto error;
3101 }
3102 /* Use minimum queue sizes unless the CQ is resized */
3103 qp_info->send_queue.max_active = mad_sendq_size;
3104 qp_info->recv_queue.max_active = mad_recvq_size;
3105 return 0;
3106
3107error:
3108 return ret;
3109}
3110
3111static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3112{
3113 if (!qp_info->qp)
3114 return;
3115
3116 ib_destroy_qp(qp_info->qp);
3117 kfree(qp_info->snoop_table);
3118}
3119
3120/*
3121 * Open the port
3122 * Create the QP, PD, MR, and CQ if needed
3123 */
3124static int ib_mad_port_open(struct ib_device *device,
3125 int port_num)
3126{
3127 int ret, cq_size;
3128 struct ib_mad_port_private *port_priv;
3129 unsigned long flags;
3130 char name[sizeof "ib_mad123"];
3131 int has_smi;
3132
3133 if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3134 return -EFAULT;
3135
3136 if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3137 rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3138 return -EFAULT;
3139
3140 /* Create new device info */
3141 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3142 if (!port_priv) {
3143 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
3144 return -ENOMEM;
3145 }
3146
3147 port_priv->device = device;
3148 port_priv->port_num = port_num;
3149 spin_lock_init(&port_priv->reg_lock);
3150 INIT_LIST_HEAD(&port_priv->agent_list);
3151 init_mad_qp(port_priv, &port_priv->qp_info[0]);
3152 init_mad_qp(port_priv, &port_priv->qp_info[1]);
3153
3154 cq_size = mad_sendq_size + mad_recvq_size;
3155 has_smi = rdma_cap_ib_smi(device, port_num);
3156 if (has_smi)
3157 cq_size *= 2;
3158
3159 port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3160 IB_POLL_WORKQUEUE);
3161 if (IS_ERR(port_priv->cq)) {
3162 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3163 ret = PTR_ERR(port_priv->cq);
3164 goto error3;
3165 }
3166
3167 port_priv->pd = ib_alloc_pd(device);
3168 if (IS_ERR(port_priv->pd)) {
3169 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3170 ret = PTR_ERR(port_priv->pd);
3171 goto error4;
3172 }
3173
3174 if (has_smi) {
3175 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3176 if (ret)
3177 goto error6;
3178 }
3179 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3180 if (ret)
3181 goto error7;
3182
3183 snprintf(name, sizeof name, "ib_mad%d", port_num);
3184 port_priv->wq = create_singlethread_workqueue(name);
3185 if (!port_priv->wq) {
3186 ret = -ENOMEM;
3187 goto error8;
3188 }
3189
3190 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3191 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3192 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3193
3194 ret = ib_mad_port_start(port_priv);
3195 if (ret) {
3196 dev_err(&device->dev, "Couldn't start port\n");
3197 goto error9;
3198 }
3199
3200 return 0;
3201
3202error9:
3203 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3204 list_del_init(&port_priv->port_list);
3205 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3206
3207 destroy_workqueue(port_priv->wq);
3208error8:
3209 destroy_mad_qp(&port_priv->qp_info[1]);
3210error7:
3211 destroy_mad_qp(&port_priv->qp_info[0]);
3212error6:
3213 ib_dealloc_pd(port_priv->pd);
3214error4:
3215 ib_free_cq(port_priv->cq);
3216 cleanup_recv_queue(&port_priv->qp_info[1]);
3217 cleanup_recv_queue(&port_priv->qp_info[0]);
3218error3:
3219 kfree(port_priv);
3220
3221 return ret;
3222}
3223
3224/*
3225 * Close the port
3226 * If there are no classes using the port, free the port
3227 * resources (CQ, MR, PD, QP) and remove the port's info structure
3228 */
3229static int ib_mad_port_close(struct ib_device *device, int port_num)
3230{
3231 struct ib_mad_port_private *port_priv;
3232 unsigned long flags;
3233
3234 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3235 port_priv = __ib_get_mad_port(device, port_num);
3236 if (port_priv == NULL) {
3237 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3238 dev_err(&device->dev, "Port %d not found\n", port_num);
3239 return -ENODEV;
3240 }
3241 list_del_init(&port_priv->port_list);
3242 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3243
3244 destroy_workqueue(port_priv->wq);
3245 destroy_mad_qp(&port_priv->qp_info[1]);
3246 destroy_mad_qp(&port_priv->qp_info[0]);
3247 ib_dealloc_pd(port_priv->pd);
3248 ib_free_cq(port_priv->cq);
3249 cleanup_recv_queue(&port_priv->qp_info[1]);
3250 cleanup_recv_queue(&port_priv->qp_info[0]);
3251 /* XXX: Handle deallocation of MAD registration tables */
3252
3253 kfree(port_priv);
3254
3255 return 0;
3256}
3257
3258static void ib_mad_init_device(struct ib_device *device)
3259{
3260 int start, i;
3261
3262 start = rdma_start_port(device);
3263
3264 for (i = start; i <= rdma_end_port(device); i++) {
3265 if (!rdma_cap_ib_mad(device, i))
3266 continue;
3267
3268 if (ib_mad_port_open(device, i)) {
3269 dev_err(&device->dev, "Couldn't open port %d\n", i);
3270 goto error;
3271 }
3272 if (ib_agent_port_open(device, i)) {
3273 dev_err(&device->dev,
3274 "Couldn't open port %d for agents\n", i);
3275 goto error_agent;
3276 }
3277 }
3278 return;
3279
3280error_agent:
3281 if (ib_mad_port_close(device, i))
3282 dev_err(&device->dev, "Couldn't close port %d\n", i);
3283
3284error:
3285 while (--i >= start) {
3286 if (!rdma_cap_ib_mad(device, i))
3287 continue;
3288
3289 if (ib_agent_port_close(device, i))
3290 dev_err(&device->dev,
3291 "Couldn't close port %d for agents\n", i);
3292 if (ib_mad_port_close(device, i))
3293 dev_err(&device->dev, "Couldn't close port %d\n", i);
3294 }
3295}
3296
3297static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3298{
3299 int i;
3300
3301 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3302 if (!rdma_cap_ib_mad(device, i))
3303 continue;
3304
3305 if (ib_agent_port_close(device, i))
3306 dev_err(&device->dev,
3307 "Couldn't close port %d for agents\n", i);
3308 if (ib_mad_port_close(device, i))
3309 dev_err(&device->dev, "Couldn't close port %d\n", i);
3310 }
3311}
3312
3313static struct ib_client mad_client = {
3314 .name = "mad",
3315 .add = ib_mad_init_device,
3316 .remove = ib_mad_remove_device
3317};
3318
3319static int __init ib_mad_init_module(void)
3320{
3321 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3322 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3323
3324 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3325 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3326
3327 INIT_LIST_HEAD(&ib_mad_port_list);
3328
3329 if (ib_register_client(&mad_client)) {
3330 pr_err("Couldn't register ib_mad client\n");
3331 return -EINVAL;
3332 }
3333
3334 return 0;
3335}
3336
3337static void __exit ib_mad_cleanup_module(void)
3338{
3339 ib_unregister_client(&mad_client);
3340}
3341
3342module_init(ib_mad_init_module);
3343module_exit(ib_mad_cleanup_module);