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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 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 */
36#include <linux/dma-mapping.h>
37#include <linux/slab.h>
38#include <linux/module.h>
39#include <rdma/ib_cache.h>
40
41#include "mad_priv.h"
42#include "mad_rmpp.h"
43#include "smi.h"
44#include "agent.h"
45
46MODULE_LICENSE("Dual BSD/GPL");
47MODULE_DESCRIPTION("kernel IB MAD API");
48MODULE_AUTHOR("Hal Rosenstock");
49MODULE_AUTHOR("Sean Hefty");
50
51static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
52static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
53
54module_param_named(send_queue_size, mad_sendq_size, int, 0444);
55MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
56module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
57MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
58
59static struct kmem_cache *ib_mad_cache;
60
61static struct list_head ib_mad_port_list;
62static u32 ib_mad_client_id = 0;
63
64/* Port list lock */
65static DEFINE_SPINLOCK(ib_mad_port_list_lock);
66
67/* Forward declarations */
68static int method_in_use(struct ib_mad_mgmt_method_table **method,
69 struct ib_mad_reg_req *mad_reg_req);
70static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
71static struct ib_mad_agent_private *find_mad_agent(
72 struct ib_mad_port_private *port_priv,
73 struct ib_mad *mad);
74static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
75 struct ib_mad_private *mad);
76static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
77static void timeout_sends(struct work_struct *work);
78static void local_completions(struct work_struct *work);
79static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
80 struct ib_mad_agent_private *agent_priv,
81 u8 mgmt_class);
82static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
83 struct ib_mad_agent_private *agent_priv);
84
85/*
86 * Returns a ib_mad_port_private structure or NULL for a device/port
87 * Assumes ib_mad_port_list_lock is being held
88 */
89static inline struct ib_mad_port_private *
90__ib_get_mad_port(struct ib_device *device, int port_num)
91{
92 struct ib_mad_port_private *entry;
93
94 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
95 if (entry->device == device && entry->port_num == port_num)
96 return entry;
97 }
98 return NULL;
99}
100
101/*
102 * Wrapper function to return a ib_mad_port_private structure or NULL
103 * for a device/port
104 */
105static inline struct ib_mad_port_private *
106ib_get_mad_port(struct ib_device *device, int port_num)
107{
108 struct ib_mad_port_private *entry;
109 unsigned long flags;
110
111 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
112 entry = __ib_get_mad_port(device, port_num);
113 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
114
115 return entry;
116}
117
118static inline u8 convert_mgmt_class(u8 mgmt_class)
119{
120 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
121 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
122 0 : mgmt_class;
123}
124
125static int get_spl_qp_index(enum ib_qp_type qp_type)
126{
127 switch (qp_type)
128 {
129 case IB_QPT_SMI:
130 return 0;
131 case IB_QPT_GSI:
132 return 1;
133 default:
134 return -1;
135 }
136}
137
138static int vendor_class_index(u8 mgmt_class)
139{
140 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
141}
142
143static int is_vendor_class(u8 mgmt_class)
144{
145 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
146 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
147 return 0;
148 return 1;
149}
150
151static int is_vendor_oui(char *oui)
152{
153 if (oui[0] || oui[1] || oui[2])
154 return 1;
155 return 0;
156}
157
158static int is_vendor_method_in_use(
159 struct ib_mad_mgmt_vendor_class *vendor_class,
160 struct ib_mad_reg_req *mad_reg_req)
161{
162 struct ib_mad_mgmt_method_table *method;
163 int i;
164
165 for (i = 0; i < MAX_MGMT_OUI; i++) {
166 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
167 method = vendor_class->method_table[i];
168 if (method) {
169 if (method_in_use(&method, mad_reg_req))
170 return 1;
171 else
172 break;
173 }
174 }
175 }
176 return 0;
177}
178
179int ib_response_mad(struct ib_mad *mad)
180{
181 return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
182 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
183 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
184 (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
185}
186EXPORT_SYMBOL(ib_response_mad);
187
188/*
189 * ib_register_mad_agent - Register to send/receive MADs
190 */
191struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
192 u8 port_num,
193 enum ib_qp_type qp_type,
194 struct ib_mad_reg_req *mad_reg_req,
195 u8 rmpp_version,
196 ib_mad_send_handler send_handler,
197 ib_mad_recv_handler recv_handler,
198 void *context)
199{
200 struct ib_mad_port_private *port_priv;
201 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
202 struct ib_mad_agent_private *mad_agent_priv;
203 struct ib_mad_reg_req *reg_req = NULL;
204 struct ib_mad_mgmt_class_table *class;
205 struct ib_mad_mgmt_vendor_class_table *vendor;
206 struct ib_mad_mgmt_vendor_class *vendor_class;
207 struct ib_mad_mgmt_method_table *method;
208 int ret2, qpn;
209 unsigned long flags;
210 u8 mgmt_class, vclass;
211
212 /* Validate parameters */
213 qpn = get_spl_qp_index(qp_type);
214 if (qpn == -1)
215 goto error1;
216
217 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
218 goto error1;
219
220 /* Validate MAD registration request if supplied */
221 if (mad_reg_req) {
222 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
223 goto error1;
224 if (!recv_handler)
225 goto error1;
226 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
227 /*
228 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
229 * one in this range currently allowed
230 */
231 if (mad_reg_req->mgmt_class !=
232 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
233 goto error1;
234 } else if (mad_reg_req->mgmt_class == 0) {
235 /*
236 * Class 0 is reserved in IBA and is used for
237 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
238 */
239 goto error1;
240 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
241 /*
242 * If class is in "new" vendor range,
243 * ensure supplied OUI is not zero
244 */
245 if (!is_vendor_oui(mad_reg_req->oui))
246 goto error1;
247 }
248 /* Make sure class supplied is consistent with RMPP */
249 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
250 if (rmpp_version)
251 goto error1;
252 }
253 /* Make sure class supplied is consistent with QP type */
254 if (qp_type == IB_QPT_SMI) {
255 if ((mad_reg_req->mgmt_class !=
256 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
257 (mad_reg_req->mgmt_class !=
258 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
259 goto error1;
260 } else {
261 if ((mad_reg_req->mgmt_class ==
262 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
263 (mad_reg_req->mgmt_class ==
264 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
265 goto error1;
266 }
267 } else {
268 /* No registration request supplied */
269 if (!send_handler)
270 goto error1;
271 }
272
273 /* Validate device and port */
274 port_priv = ib_get_mad_port(device, port_num);
275 if (!port_priv) {
276 ret = ERR_PTR(-ENODEV);
277 goto error1;
278 }
279
280 /* Verify the QP requested is supported. For example, Ethernet devices
281 * will not have QP0 */
282 if (!port_priv->qp_info[qpn].qp) {
283 ret = ERR_PTR(-EPROTONOSUPPORT);
284 goto error1;
285 }
286
287 /* Allocate structures */
288 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
289 if (!mad_agent_priv) {
290 ret = ERR_PTR(-ENOMEM);
291 goto error1;
292 }
293
294 mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
295 IB_ACCESS_LOCAL_WRITE);
296 if (IS_ERR(mad_agent_priv->agent.mr)) {
297 ret = ERR_PTR(-ENOMEM);
298 goto error2;
299 }
300
301 if (mad_reg_req) {
302 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
303 if (!reg_req) {
304 ret = ERR_PTR(-ENOMEM);
305 goto error3;
306 }
307 }
308
309 /* Now, fill in the various structures */
310 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
311 mad_agent_priv->reg_req = reg_req;
312 mad_agent_priv->agent.rmpp_version = rmpp_version;
313 mad_agent_priv->agent.device = device;
314 mad_agent_priv->agent.recv_handler = recv_handler;
315 mad_agent_priv->agent.send_handler = send_handler;
316 mad_agent_priv->agent.context = context;
317 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
318 mad_agent_priv->agent.port_num = port_num;
319 spin_lock_init(&mad_agent_priv->lock);
320 INIT_LIST_HEAD(&mad_agent_priv->send_list);
321 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
322 INIT_LIST_HEAD(&mad_agent_priv->done_list);
323 INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
324 INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
325 INIT_LIST_HEAD(&mad_agent_priv->local_list);
326 INIT_WORK(&mad_agent_priv->local_work, local_completions);
327 atomic_set(&mad_agent_priv->refcount, 1);
328 init_completion(&mad_agent_priv->comp);
329
330 spin_lock_irqsave(&port_priv->reg_lock, flags);
331 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
332
333 /*
334 * Make sure MAD registration (if supplied)
335 * is non overlapping with any existing ones
336 */
337 if (mad_reg_req) {
338 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
339 if (!is_vendor_class(mgmt_class)) {
340 class = port_priv->version[mad_reg_req->
341 mgmt_class_version].class;
342 if (class) {
343 method = class->method_table[mgmt_class];
344 if (method) {
345 if (method_in_use(&method,
346 mad_reg_req))
347 goto error4;
348 }
349 }
350 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
351 mgmt_class);
352 } else {
353 /* "New" vendor class range */
354 vendor = port_priv->version[mad_reg_req->
355 mgmt_class_version].vendor;
356 if (vendor) {
357 vclass = vendor_class_index(mgmt_class);
358 vendor_class = vendor->vendor_class[vclass];
359 if (vendor_class) {
360 if (is_vendor_method_in_use(
361 vendor_class,
362 mad_reg_req))
363 goto error4;
364 }
365 }
366 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
367 }
368 if (ret2) {
369 ret = ERR_PTR(ret2);
370 goto error4;
371 }
372 }
373
374 /* Add mad agent into port's agent list */
375 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
376 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
377
378 return &mad_agent_priv->agent;
379
380error4:
381 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
382 kfree(reg_req);
383error3:
384 ib_dereg_mr(mad_agent_priv->agent.mr);
385error2:
386 kfree(mad_agent_priv);
387error1:
388 return ret;
389}
390EXPORT_SYMBOL(ib_register_mad_agent);
391
392static inline int is_snooping_sends(int mad_snoop_flags)
393{
394 return (mad_snoop_flags &
395 (/*IB_MAD_SNOOP_POSTED_SENDS |
396 IB_MAD_SNOOP_RMPP_SENDS |*/
397 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
398 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
399}
400
401static inline int is_snooping_recvs(int mad_snoop_flags)
402{
403 return (mad_snoop_flags &
404 (IB_MAD_SNOOP_RECVS /*|
405 IB_MAD_SNOOP_RMPP_RECVS*/));
406}
407
408static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
409 struct ib_mad_snoop_private *mad_snoop_priv)
410{
411 struct ib_mad_snoop_private **new_snoop_table;
412 unsigned long flags;
413 int i;
414
415 spin_lock_irqsave(&qp_info->snoop_lock, flags);
416 /* Check for empty slot in array. */
417 for (i = 0; i < qp_info->snoop_table_size; i++)
418 if (!qp_info->snoop_table[i])
419 break;
420
421 if (i == qp_info->snoop_table_size) {
422 /* Grow table. */
423 new_snoop_table = krealloc(qp_info->snoop_table,
424 sizeof mad_snoop_priv *
425 (qp_info->snoop_table_size + 1),
426 GFP_ATOMIC);
427 if (!new_snoop_table) {
428 i = -ENOMEM;
429 goto out;
430 }
431
432 qp_info->snoop_table = new_snoop_table;
433 qp_info->snoop_table_size++;
434 }
435 qp_info->snoop_table[i] = mad_snoop_priv;
436 atomic_inc(&qp_info->snoop_count);
437out:
438 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
439 return i;
440}
441
442struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
443 u8 port_num,
444 enum ib_qp_type qp_type,
445 int mad_snoop_flags,
446 ib_mad_snoop_handler snoop_handler,
447 ib_mad_recv_handler recv_handler,
448 void *context)
449{
450 struct ib_mad_port_private *port_priv;
451 struct ib_mad_agent *ret;
452 struct ib_mad_snoop_private *mad_snoop_priv;
453 int qpn;
454
455 /* Validate parameters */
456 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
457 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
458 ret = ERR_PTR(-EINVAL);
459 goto error1;
460 }
461 qpn = get_spl_qp_index(qp_type);
462 if (qpn == -1) {
463 ret = ERR_PTR(-EINVAL);
464 goto error1;
465 }
466 port_priv = ib_get_mad_port(device, port_num);
467 if (!port_priv) {
468 ret = ERR_PTR(-ENODEV);
469 goto error1;
470 }
471 /* Allocate structures */
472 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
473 if (!mad_snoop_priv) {
474 ret = ERR_PTR(-ENOMEM);
475 goto error1;
476 }
477
478 /* Now, fill in the various structures */
479 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
480 mad_snoop_priv->agent.device = device;
481 mad_snoop_priv->agent.recv_handler = recv_handler;
482 mad_snoop_priv->agent.snoop_handler = snoop_handler;
483 mad_snoop_priv->agent.context = context;
484 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
485 mad_snoop_priv->agent.port_num = port_num;
486 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
487 init_completion(&mad_snoop_priv->comp);
488 mad_snoop_priv->snoop_index = register_snoop_agent(
489 &port_priv->qp_info[qpn],
490 mad_snoop_priv);
491 if (mad_snoop_priv->snoop_index < 0) {
492 ret = ERR_PTR(mad_snoop_priv->snoop_index);
493 goto error2;
494 }
495
496 atomic_set(&mad_snoop_priv->refcount, 1);
497 return &mad_snoop_priv->agent;
498
499error2:
500 kfree(mad_snoop_priv);
501error1:
502 return ret;
503}
504EXPORT_SYMBOL(ib_register_mad_snoop);
505
506static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
507{
508 if (atomic_dec_and_test(&mad_agent_priv->refcount))
509 complete(&mad_agent_priv->comp);
510}
511
512static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
513{
514 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
515 complete(&mad_snoop_priv->comp);
516}
517
518static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
519{
520 struct ib_mad_port_private *port_priv;
521 unsigned long flags;
522
523 /* Note that we could still be handling received MADs */
524
525 /*
526 * Canceling all sends results in dropping received response
527 * MADs, preventing us from queuing additional work
528 */
529 cancel_mads(mad_agent_priv);
530 port_priv = mad_agent_priv->qp_info->port_priv;
531 cancel_delayed_work(&mad_agent_priv->timed_work);
532
533 spin_lock_irqsave(&port_priv->reg_lock, flags);
534 remove_mad_reg_req(mad_agent_priv);
535 list_del(&mad_agent_priv->agent_list);
536 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
537
538 flush_workqueue(port_priv->wq);
539 ib_cancel_rmpp_recvs(mad_agent_priv);
540
541 deref_mad_agent(mad_agent_priv);
542 wait_for_completion(&mad_agent_priv->comp);
543
544 kfree(mad_agent_priv->reg_req);
545 ib_dereg_mr(mad_agent_priv->agent.mr);
546 kfree(mad_agent_priv);
547}
548
549static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
550{
551 struct ib_mad_qp_info *qp_info;
552 unsigned long flags;
553
554 qp_info = mad_snoop_priv->qp_info;
555 spin_lock_irqsave(&qp_info->snoop_lock, flags);
556 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
557 atomic_dec(&qp_info->snoop_count);
558 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
559
560 deref_snoop_agent(mad_snoop_priv);
561 wait_for_completion(&mad_snoop_priv->comp);
562
563 kfree(mad_snoop_priv);
564}
565
566/*
567 * ib_unregister_mad_agent - Unregisters a client from using MAD services
568 */
569int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
570{
571 struct ib_mad_agent_private *mad_agent_priv;
572 struct ib_mad_snoop_private *mad_snoop_priv;
573
574 /* If the TID is zero, the agent can only snoop. */
575 if (mad_agent->hi_tid) {
576 mad_agent_priv = container_of(mad_agent,
577 struct ib_mad_agent_private,
578 agent);
579 unregister_mad_agent(mad_agent_priv);
580 } else {
581 mad_snoop_priv = container_of(mad_agent,
582 struct ib_mad_snoop_private,
583 agent);
584 unregister_mad_snoop(mad_snoop_priv);
585 }
586 return 0;
587}
588EXPORT_SYMBOL(ib_unregister_mad_agent);
589
590static void dequeue_mad(struct ib_mad_list_head *mad_list)
591{
592 struct ib_mad_queue *mad_queue;
593 unsigned long flags;
594
595 BUG_ON(!mad_list->mad_queue);
596 mad_queue = mad_list->mad_queue;
597 spin_lock_irqsave(&mad_queue->lock, flags);
598 list_del(&mad_list->list);
599 mad_queue->count--;
600 spin_unlock_irqrestore(&mad_queue->lock, flags);
601}
602
603static void snoop_send(struct ib_mad_qp_info *qp_info,
604 struct ib_mad_send_buf *send_buf,
605 struct ib_mad_send_wc *mad_send_wc,
606 int mad_snoop_flags)
607{
608 struct ib_mad_snoop_private *mad_snoop_priv;
609 unsigned long flags;
610 int i;
611
612 spin_lock_irqsave(&qp_info->snoop_lock, flags);
613 for (i = 0; i < qp_info->snoop_table_size; i++) {
614 mad_snoop_priv = qp_info->snoop_table[i];
615 if (!mad_snoop_priv ||
616 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
617 continue;
618
619 atomic_inc(&mad_snoop_priv->refcount);
620 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
621 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
622 send_buf, mad_send_wc);
623 deref_snoop_agent(mad_snoop_priv);
624 spin_lock_irqsave(&qp_info->snoop_lock, flags);
625 }
626 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
627}
628
629static void snoop_recv(struct ib_mad_qp_info *qp_info,
630 struct ib_mad_recv_wc *mad_recv_wc,
631 int mad_snoop_flags)
632{
633 struct ib_mad_snoop_private *mad_snoop_priv;
634 unsigned long flags;
635 int i;
636
637 spin_lock_irqsave(&qp_info->snoop_lock, flags);
638 for (i = 0; i < qp_info->snoop_table_size; i++) {
639 mad_snoop_priv = qp_info->snoop_table[i];
640 if (!mad_snoop_priv ||
641 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
642 continue;
643
644 atomic_inc(&mad_snoop_priv->refcount);
645 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
646 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
647 mad_recv_wc);
648 deref_snoop_agent(mad_snoop_priv);
649 spin_lock_irqsave(&qp_info->snoop_lock, flags);
650 }
651 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
652}
653
654static void build_smp_wc(struct ib_qp *qp,
655 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
656 struct ib_wc *wc)
657{
658 memset(wc, 0, sizeof *wc);
659 wc->wr_id = wr_id;
660 wc->status = IB_WC_SUCCESS;
661 wc->opcode = IB_WC_RECV;
662 wc->pkey_index = pkey_index;
663 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
664 wc->src_qp = IB_QP0;
665 wc->qp = qp;
666 wc->slid = slid;
667 wc->sl = 0;
668 wc->dlid_path_bits = 0;
669 wc->port_num = port_num;
670}
671
672/*
673 * Return 0 if SMP is to be sent
674 * Return 1 if SMP was consumed locally (whether or not solicited)
675 * Return < 0 if error
676 */
677static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
678 struct ib_mad_send_wr_private *mad_send_wr)
679{
680 int ret = 0;
681 struct ib_smp *smp = mad_send_wr->send_buf.mad;
682 unsigned long flags;
683 struct ib_mad_local_private *local;
684 struct ib_mad_private *mad_priv;
685 struct ib_mad_port_private *port_priv;
686 struct ib_mad_agent_private *recv_mad_agent = NULL;
687 struct ib_device *device = mad_agent_priv->agent.device;
688 u8 port_num;
689 struct ib_wc mad_wc;
690 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
691
692 if (device->node_type == RDMA_NODE_IB_SWITCH &&
693 smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
694 port_num = send_wr->wr.ud.port_num;
695 else
696 port_num = mad_agent_priv->agent.port_num;
697
698 /*
699 * Directed route handling starts if the initial LID routed part of
700 * a request or the ending LID routed part of a response is empty.
701 * If we are at the start of the LID routed part, don't update the
702 * hop_ptr or hop_cnt. See section 14.2.2, Vol 1 IB spec.
703 */
704 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
705 IB_LID_PERMISSIVE &&
706 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
707 IB_SMI_DISCARD) {
708 ret = -EINVAL;
709 printk(KERN_ERR PFX "Invalid directed route\n");
710 goto out;
711 }
712
713 /* Check to post send on QP or process locally */
714 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
715 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
716 goto out;
717
718 local = kmalloc(sizeof *local, GFP_ATOMIC);
719 if (!local) {
720 ret = -ENOMEM;
721 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
722 goto out;
723 }
724 local->mad_priv = NULL;
725 local->recv_mad_agent = NULL;
726 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
727 if (!mad_priv) {
728 ret = -ENOMEM;
729 printk(KERN_ERR PFX "No memory for local response MAD\n");
730 kfree(local);
731 goto out;
732 }
733
734 build_smp_wc(mad_agent_priv->agent.qp,
735 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
736 send_wr->wr.ud.pkey_index,
737 send_wr->wr.ud.port_num, &mad_wc);
738
739 /* No GRH for DR SMP */
740 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
741 (struct ib_mad *)smp,
742 (struct ib_mad *)&mad_priv->mad);
743 switch (ret)
744 {
745 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
746 if (ib_response_mad(&mad_priv->mad.mad) &&
747 mad_agent_priv->agent.recv_handler) {
748 local->mad_priv = mad_priv;
749 local->recv_mad_agent = mad_agent_priv;
750 /*
751 * Reference MAD agent until receive
752 * side of local completion handled
753 */
754 atomic_inc(&mad_agent_priv->refcount);
755 } else
756 kmem_cache_free(ib_mad_cache, mad_priv);
757 break;
758 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
759 kmem_cache_free(ib_mad_cache, mad_priv);
760 break;
761 case IB_MAD_RESULT_SUCCESS:
762 /* Treat like an incoming receive MAD */
763 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
764 mad_agent_priv->agent.port_num);
765 if (port_priv) {
766 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
767 recv_mad_agent = find_mad_agent(port_priv,
768 &mad_priv->mad.mad);
769 }
770 if (!port_priv || !recv_mad_agent) {
771 /*
772 * No receiving agent so drop packet and
773 * generate send completion.
774 */
775 kmem_cache_free(ib_mad_cache, mad_priv);
776 break;
777 }
778 local->mad_priv = mad_priv;
779 local->recv_mad_agent = recv_mad_agent;
780 break;
781 default:
782 kmem_cache_free(ib_mad_cache, mad_priv);
783 kfree(local);
784 ret = -EINVAL;
785 goto out;
786 }
787
788 local->mad_send_wr = mad_send_wr;
789 /* Reference MAD agent until send side of local completion handled */
790 atomic_inc(&mad_agent_priv->refcount);
791 /* Queue local completion to local list */
792 spin_lock_irqsave(&mad_agent_priv->lock, flags);
793 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
794 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
795 queue_work(mad_agent_priv->qp_info->port_priv->wq,
796 &mad_agent_priv->local_work);
797 ret = 1;
798out:
799 return ret;
800}
801
802static int get_pad_size(int hdr_len, int data_len)
803{
804 int seg_size, pad;
805
806 seg_size = sizeof(struct ib_mad) - hdr_len;
807 if (data_len && seg_size) {
808 pad = seg_size - data_len % seg_size;
809 return pad == seg_size ? 0 : pad;
810 } else
811 return seg_size;
812}
813
814static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
815{
816 struct ib_rmpp_segment *s, *t;
817
818 list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
819 list_del(&s->list);
820 kfree(s);
821 }
822}
823
824static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
825 gfp_t gfp_mask)
826{
827 struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
828 struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
829 struct ib_rmpp_segment *seg = NULL;
830 int left, seg_size, pad;
831
832 send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
833 seg_size = send_buf->seg_size;
834 pad = send_wr->pad;
835
836 /* Allocate data segments. */
837 for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
838 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
839 if (!seg) {
840 printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
841 "alloc failed for len %zd, gfp %#x\n",
842 sizeof (*seg) + seg_size, gfp_mask);
843 free_send_rmpp_list(send_wr);
844 return -ENOMEM;
845 }
846 seg->num = ++send_buf->seg_count;
847 list_add_tail(&seg->list, &send_wr->rmpp_list);
848 }
849
850 /* Zero any padding */
851 if (pad)
852 memset(seg->data + seg_size - pad, 0, pad);
853
854 rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
855 agent.rmpp_version;
856 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
857 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
858
859 send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
860 struct ib_rmpp_segment, list);
861 send_wr->last_ack_seg = send_wr->cur_seg;
862 return 0;
863}
864
865struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
866 u32 remote_qpn, u16 pkey_index,
867 int rmpp_active,
868 int hdr_len, int data_len,
869 gfp_t gfp_mask)
870{
871 struct ib_mad_agent_private *mad_agent_priv;
872 struct ib_mad_send_wr_private *mad_send_wr;
873 int pad, message_size, ret, size;
874 void *buf;
875
876 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
877 agent);
878 pad = get_pad_size(hdr_len, data_len);
879 message_size = hdr_len + data_len + pad;
880
881 if ((!mad_agent->rmpp_version &&
882 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
883 (!rmpp_active && message_size > sizeof(struct ib_mad)))
884 return ERR_PTR(-EINVAL);
885
886 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
887 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
888 if (!buf)
889 return ERR_PTR(-ENOMEM);
890
891 mad_send_wr = buf + size;
892 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
893 mad_send_wr->send_buf.mad = buf;
894 mad_send_wr->send_buf.hdr_len = hdr_len;
895 mad_send_wr->send_buf.data_len = data_len;
896 mad_send_wr->pad = pad;
897
898 mad_send_wr->mad_agent_priv = mad_agent_priv;
899 mad_send_wr->sg_list[0].length = hdr_len;
900 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
901 mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
902 mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
903
904 mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
905 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
906 mad_send_wr->send_wr.num_sge = 2;
907 mad_send_wr->send_wr.opcode = IB_WR_SEND;
908 mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
909 mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
910 mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
911 mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
912
913 if (rmpp_active) {
914 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
915 if (ret) {
916 kfree(buf);
917 return ERR_PTR(ret);
918 }
919 }
920
921 mad_send_wr->send_buf.mad_agent = mad_agent;
922 atomic_inc(&mad_agent_priv->refcount);
923 return &mad_send_wr->send_buf;
924}
925EXPORT_SYMBOL(ib_create_send_mad);
926
927int ib_get_mad_data_offset(u8 mgmt_class)
928{
929 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
930 return IB_MGMT_SA_HDR;
931 else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
932 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
933 (mgmt_class == IB_MGMT_CLASS_BIS))
934 return IB_MGMT_DEVICE_HDR;
935 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
936 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
937 return IB_MGMT_VENDOR_HDR;
938 else
939 return IB_MGMT_MAD_HDR;
940}
941EXPORT_SYMBOL(ib_get_mad_data_offset);
942
943int ib_is_mad_class_rmpp(u8 mgmt_class)
944{
945 if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
946 (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
947 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
948 (mgmt_class == IB_MGMT_CLASS_BIS) ||
949 ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
950 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
951 return 1;
952 return 0;
953}
954EXPORT_SYMBOL(ib_is_mad_class_rmpp);
955
956void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
957{
958 struct ib_mad_send_wr_private *mad_send_wr;
959 struct list_head *list;
960
961 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
962 send_buf);
963 list = &mad_send_wr->cur_seg->list;
964
965 if (mad_send_wr->cur_seg->num < seg_num) {
966 list_for_each_entry(mad_send_wr->cur_seg, list, list)
967 if (mad_send_wr->cur_seg->num == seg_num)
968 break;
969 } else if (mad_send_wr->cur_seg->num > seg_num) {
970 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
971 if (mad_send_wr->cur_seg->num == seg_num)
972 break;
973 }
974 return mad_send_wr->cur_seg->data;
975}
976EXPORT_SYMBOL(ib_get_rmpp_segment);
977
978static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
979{
980 if (mad_send_wr->send_buf.seg_count)
981 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
982 mad_send_wr->seg_num);
983 else
984 return mad_send_wr->send_buf.mad +
985 mad_send_wr->send_buf.hdr_len;
986}
987
988void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
989{
990 struct ib_mad_agent_private *mad_agent_priv;
991 struct ib_mad_send_wr_private *mad_send_wr;
992
993 mad_agent_priv = container_of(send_buf->mad_agent,
994 struct ib_mad_agent_private, agent);
995 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
996 send_buf);
997
998 free_send_rmpp_list(mad_send_wr);
999 kfree(send_buf->mad);
1000 deref_mad_agent(mad_agent_priv);
1001}
1002EXPORT_SYMBOL(ib_free_send_mad);
1003
1004int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1005{
1006 struct ib_mad_qp_info *qp_info;
1007 struct list_head *list;
1008 struct ib_send_wr *bad_send_wr;
1009 struct ib_mad_agent *mad_agent;
1010 struct ib_sge *sge;
1011 unsigned long flags;
1012 int ret;
1013
1014 /* Set WR ID to find mad_send_wr upon completion */
1015 qp_info = mad_send_wr->mad_agent_priv->qp_info;
1016 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1017 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1018
1019 mad_agent = mad_send_wr->send_buf.mad_agent;
1020 sge = mad_send_wr->sg_list;
1021 sge[0].addr = ib_dma_map_single(mad_agent->device,
1022 mad_send_wr->send_buf.mad,
1023 sge[0].length,
1024 DMA_TO_DEVICE);
1025 mad_send_wr->header_mapping = sge[0].addr;
1026
1027 sge[1].addr = ib_dma_map_single(mad_agent->device,
1028 ib_get_payload(mad_send_wr),
1029 sge[1].length,
1030 DMA_TO_DEVICE);
1031 mad_send_wr->payload_mapping = sge[1].addr;
1032
1033 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1034 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1035 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1036 &bad_send_wr);
1037 list = &qp_info->send_queue.list;
1038 } else {
1039 ret = 0;
1040 list = &qp_info->overflow_list;
1041 }
1042
1043 if (!ret) {
1044 qp_info->send_queue.count++;
1045 list_add_tail(&mad_send_wr->mad_list.list, list);
1046 }
1047 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1048 if (ret) {
1049 ib_dma_unmap_single(mad_agent->device,
1050 mad_send_wr->header_mapping,
1051 sge[0].length, DMA_TO_DEVICE);
1052 ib_dma_unmap_single(mad_agent->device,
1053 mad_send_wr->payload_mapping,
1054 sge[1].length, DMA_TO_DEVICE);
1055 }
1056 return ret;
1057}
1058
1059/*
1060 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1061 * with the registered client
1062 */
1063int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1064 struct ib_mad_send_buf **bad_send_buf)
1065{
1066 struct ib_mad_agent_private *mad_agent_priv;
1067 struct ib_mad_send_buf *next_send_buf;
1068 struct ib_mad_send_wr_private *mad_send_wr;
1069 unsigned long flags;
1070 int ret = -EINVAL;
1071
1072 /* Walk list of send WRs and post each on send list */
1073 for (; send_buf; send_buf = next_send_buf) {
1074
1075 mad_send_wr = container_of(send_buf,
1076 struct ib_mad_send_wr_private,
1077 send_buf);
1078 mad_agent_priv = mad_send_wr->mad_agent_priv;
1079
1080 if (!send_buf->mad_agent->send_handler ||
1081 (send_buf->timeout_ms &&
1082 !send_buf->mad_agent->recv_handler)) {
1083 ret = -EINVAL;
1084 goto error;
1085 }
1086
1087 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1088 if (mad_agent_priv->agent.rmpp_version) {
1089 ret = -EINVAL;
1090 goto error;
1091 }
1092 }
1093
1094 /*
1095 * Save pointer to next work request to post in case the
1096 * current one completes, and the user modifies the work
1097 * request associated with the completion
1098 */
1099 next_send_buf = send_buf->next;
1100 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1101
1102 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1103 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1104 ret = handle_outgoing_dr_smp(mad_agent_priv,
1105 mad_send_wr);
1106 if (ret < 0) /* error */
1107 goto error;
1108 else if (ret == 1) /* locally consumed */
1109 continue;
1110 }
1111
1112 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1113 /* Timeout will be updated after send completes */
1114 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1115 mad_send_wr->max_retries = send_buf->retries;
1116 mad_send_wr->retries_left = send_buf->retries;
1117 send_buf->retries = 0;
1118 /* Reference for work request to QP + response */
1119 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1120 mad_send_wr->status = IB_WC_SUCCESS;
1121
1122 /* Reference MAD agent until send completes */
1123 atomic_inc(&mad_agent_priv->refcount);
1124 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1125 list_add_tail(&mad_send_wr->agent_list,
1126 &mad_agent_priv->send_list);
1127 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1128
1129 if (mad_agent_priv->agent.rmpp_version) {
1130 ret = ib_send_rmpp_mad(mad_send_wr);
1131 if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1132 ret = ib_send_mad(mad_send_wr);
1133 } else
1134 ret = ib_send_mad(mad_send_wr);
1135 if (ret < 0) {
1136 /* Fail send request */
1137 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1138 list_del(&mad_send_wr->agent_list);
1139 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1140 atomic_dec(&mad_agent_priv->refcount);
1141 goto error;
1142 }
1143 }
1144 return 0;
1145error:
1146 if (bad_send_buf)
1147 *bad_send_buf = send_buf;
1148 return ret;
1149}
1150EXPORT_SYMBOL(ib_post_send_mad);
1151
1152/*
1153 * ib_free_recv_mad - Returns data buffers used to receive
1154 * a MAD to the access layer
1155 */
1156void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1157{
1158 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1159 struct ib_mad_private_header *mad_priv_hdr;
1160 struct ib_mad_private *priv;
1161 struct list_head free_list;
1162
1163 INIT_LIST_HEAD(&free_list);
1164 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1165
1166 list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1167 &free_list, list) {
1168 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1169 recv_buf);
1170 mad_priv_hdr = container_of(mad_recv_wc,
1171 struct ib_mad_private_header,
1172 recv_wc);
1173 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1174 header);
1175 kmem_cache_free(ib_mad_cache, priv);
1176 }
1177}
1178EXPORT_SYMBOL(ib_free_recv_mad);
1179
1180struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1181 u8 rmpp_version,
1182 ib_mad_send_handler send_handler,
1183 ib_mad_recv_handler recv_handler,
1184 void *context)
1185{
1186 return ERR_PTR(-EINVAL); /* XXX: for now */
1187}
1188EXPORT_SYMBOL(ib_redirect_mad_qp);
1189
1190int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1191 struct ib_wc *wc)
1192{
1193 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1194 return 0;
1195}
1196EXPORT_SYMBOL(ib_process_mad_wc);
1197
1198static int method_in_use(struct ib_mad_mgmt_method_table **method,
1199 struct ib_mad_reg_req *mad_reg_req)
1200{
1201 int i;
1202
1203 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1204 if ((*method)->agent[i]) {
1205 printk(KERN_ERR PFX "Method %d already in use\n", i);
1206 return -EINVAL;
1207 }
1208 }
1209 return 0;
1210}
1211
1212static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1213{
1214 /* Allocate management method table */
1215 *method = kzalloc(sizeof **method, GFP_ATOMIC);
1216 if (!*method) {
1217 printk(KERN_ERR PFX "No memory for "
1218 "ib_mad_mgmt_method_table\n");
1219 return -ENOMEM;
1220 }
1221
1222 return 0;
1223}
1224
1225/*
1226 * Check to see if there are any methods still in use
1227 */
1228static int check_method_table(struct ib_mad_mgmt_method_table *method)
1229{
1230 int i;
1231
1232 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1233 if (method->agent[i])
1234 return 1;
1235 return 0;
1236}
1237
1238/*
1239 * Check to see if there are any method tables for this class still in use
1240 */
1241static int check_class_table(struct ib_mad_mgmt_class_table *class)
1242{
1243 int i;
1244
1245 for (i = 0; i < MAX_MGMT_CLASS; i++)
1246 if (class->method_table[i])
1247 return 1;
1248 return 0;
1249}
1250
1251static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1252{
1253 int i;
1254
1255 for (i = 0; i < MAX_MGMT_OUI; i++)
1256 if (vendor_class->method_table[i])
1257 return 1;
1258 return 0;
1259}
1260
1261static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1262 char *oui)
1263{
1264 int i;
1265
1266 for (i = 0; i < MAX_MGMT_OUI; i++)
1267 /* Is there matching OUI for this vendor class ? */
1268 if (!memcmp(vendor_class->oui[i], oui, 3))
1269 return i;
1270
1271 return -1;
1272}
1273
1274static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1275{
1276 int i;
1277
1278 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1279 if (vendor->vendor_class[i])
1280 return 1;
1281
1282 return 0;
1283}
1284
1285static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1286 struct ib_mad_agent_private *agent)
1287{
1288 int i;
1289
1290 /* Remove any methods for this mad agent */
1291 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1292 if (method->agent[i] == agent) {
1293 method->agent[i] = NULL;
1294 }
1295 }
1296}
1297
1298static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1299 struct ib_mad_agent_private *agent_priv,
1300 u8 mgmt_class)
1301{
1302 struct ib_mad_port_private *port_priv;
1303 struct ib_mad_mgmt_class_table **class;
1304 struct ib_mad_mgmt_method_table **method;
1305 int i, ret;
1306
1307 port_priv = agent_priv->qp_info->port_priv;
1308 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1309 if (!*class) {
1310 /* Allocate management class table for "new" class version */
1311 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1312 if (!*class) {
1313 printk(KERN_ERR PFX "No memory for "
1314 "ib_mad_mgmt_class_table\n");
1315 ret = -ENOMEM;
1316 goto error1;
1317 }
1318
1319 /* Allocate method table for this management class */
1320 method = &(*class)->method_table[mgmt_class];
1321 if ((ret = allocate_method_table(method)))
1322 goto error2;
1323 } else {
1324 method = &(*class)->method_table[mgmt_class];
1325 if (!*method) {
1326 /* Allocate method table for this management class */
1327 if ((ret = allocate_method_table(method)))
1328 goto error1;
1329 }
1330 }
1331
1332 /* Now, make sure methods are not already in use */
1333 if (method_in_use(method, mad_reg_req))
1334 goto error3;
1335
1336 /* Finally, add in methods being registered */
1337 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1338 (*method)->agent[i] = agent_priv;
1339
1340 return 0;
1341
1342error3:
1343 /* Remove any methods for this mad agent */
1344 remove_methods_mad_agent(*method, agent_priv);
1345 /* Now, check to see if there are any methods in use */
1346 if (!check_method_table(*method)) {
1347 /* If not, release management method table */
1348 kfree(*method);
1349 *method = NULL;
1350 }
1351 ret = -EINVAL;
1352 goto error1;
1353error2:
1354 kfree(*class);
1355 *class = NULL;
1356error1:
1357 return ret;
1358}
1359
1360static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1361 struct ib_mad_agent_private *agent_priv)
1362{
1363 struct ib_mad_port_private *port_priv;
1364 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1365 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1366 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1367 struct ib_mad_mgmt_method_table **method;
1368 int i, ret = -ENOMEM;
1369 u8 vclass;
1370
1371 /* "New" vendor (with OUI) class */
1372 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1373 port_priv = agent_priv->qp_info->port_priv;
1374 vendor_table = &port_priv->version[
1375 mad_reg_req->mgmt_class_version].vendor;
1376 if (!*vendor_table) {
1377 /* Allocate mgmt vendor class table for "new" class version */
1378 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1379 if (!vendor) {
1380 printk(KERN_ERR PFX "No memory for "
1381 "ib_mad_mgmt_vendor_class_table\n");
1382 goto error1;
1383 }
1384
1385 *vendor_table = vendor;
1386 }
1387 if (!(*vendor_table)->vendor_class[vclass]) {
1388 /* Allocate table for this management vendor class */
1389 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1390 if (!vendor_class) {
1391 printk(KERN_ERR PFX "No memory for "
1392 "ib_mad_mgmt_vendor_class\n");
1393 goto error2;
1394 }
1395
1396 (*vendor_table)->vendor_class[vclass] = vendor_class;
1397 }
1398 for (i = 0; i < MAX_MGMT_OUI; i++) {
1399 /* Is there matching OUI for this vendor class ? */
1400 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1401 mad_reg_req->oui, 3)) {
1402 method = &(*vendor_table)->vendor_class[
1403 vclass]->method_table[i];
1404 BUG_ON(!*method);
1405 goto check_in_use;
1406 }
1407 }
1408 for (i = 0; i < MAX_MGMT_OUI; i++) {
1409 /* OUI slot available ? */
1410 if (!is_vendor_oui((*vendor_table)->vendor_class[
1411 vclass]->oui[i])) {
1412 method = &(*vendor_table)->vendor_class[
1413 vclass]->method_table[i];
1414 BUG_ON(*method);
1415 /* Allocate method table for this OUI */
1416 if ((ret = allocate_method_table(method)))
1417 goto error3;
1418 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1419 mad_reg_req->oui, 3);
1420 goto check_in_use;
1421 }
1422 }
1423 printk(KERN_ERR PFX "All OUI slots in use\n");
1424 goto error3;
1425
1426check_in_use:
1427 /* Now, make sure methods are not already in use */
1428 if (method_in_use(method, mad_reg_req))
1429 goto error4;
1430
1431 /* Finally, add in methods being registered */
1432 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1433 (*method)->agent[i] = agent_priv;
1434
1435 return 0;
1436
1437error4:
1438 /* Remove any methods for this mad agent */
1439 remove_methods_mad_agent(*method, agent_priv);
1440 /* Now, check to see if there are any methods in use */
1441 if (!check_method_table(*method)) {
1442 /* If not, release management method table */
1443 kfree(*method);
1444 *method = NULL;
1445 }
1446 ret = -EINVAL;
1447error3:
1448 if (vendor_class) {
1449 (*vendor_table)->vendor_class[vclass] = NULL;
1450 kfree(vendor_class);
1451 }
1452error2:
1453 if (vendor) {
1454 *vendor_table = NULL;
1455 kfree(vendor);
1456 }
1457error1:
1458 return ret;
1459}
1460
1461static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1462{
1463 struct ib_mad_port_private *port_priv;
1464 struct ib_mad_mgmt_class_table *class;
1465 struct ib_mad_mgmt_method_table *method;
1466 struct ib_mad_mgmt_vendor_class_table *vendor;
1467 struct ib_mad_mgmt_vendor_class *vendor_class;
1468 int index;
1469 u8 mgmt_class;
1470
1471 /*
1472 * Was MAD registration request supplied
1473 * with original registration ?
1474 */
1475 if (!agent_priv->reg_req) {
1476 goto out;
1477 }
1478
1479 port_priv = agent_priv->qp_info->port_priv;
1480 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1481 class = port_priv->version[
1482 agent_priv->reg_req->mgmt_class_version].class;
1483 if (!class)
1484 goto vendor_check;
1485
1486 method = class->method_table[mgmt_class];
1487 if (method) {
1488 /* Remove any methods for this mad agent */
1489 remove_methods_mad_agent(method, agent_priv);
1490 /* Now, check to see if there are any methods still in use */
1491 if (!check_method_table(method)) {
1492 /* If not, release management method table */
1493 kfree(method);
1494 class->method_table[mgmt_class] = NULL;
1495 /* Any management classes left ? */
1496 if (!check_class_table(class)) {
1497 /* If not, release management class table */
1498 kfree(class);
1499 port_priv->version[
1500 agent_priv->reg_req->
1501 mgmt_class_version].class = NULL;
1502 }
1503 }
1504 }
1505
1506vendor_check:
1507 if (!is_vendor_class(mgmt_class))
1508 goto out;
1509
1510 /* normalize mgmt_class to vendor range 2 */
1511 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1512 vendor = port_priv->version[
1513 agent_priv->reg_req->mgmt_class_version].vendor;
1514
1515 if (!vendor)
1516 goto out;
1517
1518 vendor_class = vendor->vendor_class[mgmt_class];
1519 if (vendor_class) {
1520 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1521 if (index < 0)
1522 goto out;
1523 method = vendor_class->method_table[index];
1524 if (method) {
1525 /* Remove any methods for this mad agent */
1526 remove_methods_mad_agent(method, agent_priv);
1527 /*
1528 * Now, check to see if there are
1529 * any methods still in use
1530 */
1531 if (!check_method_table(method)) {
1532 /* If not, release management method table */
1533 kfree(method);
1534 vendor_class->method_table[index] = NULL;
1535 memset(vendor_class->oui[index], 0, 3);
1536 /* Any OUIs left ? */
1537 if (!check_vendor_class(vendor_class)) {
1538 /* If not, release vendor class table */
1539 kfree(vendor_class);
1540 vendor->vendor_class[mgmt_class] = NULL;
1541 /* Any other vendor classes left ? */
1542 if (!check_vendor_table(vendor)) {
1543 kfree(vendor);
1544 port_priv->version[
1545 agent_priv->reg_req->
1546 mgmt_class_version].
1547 vendor = NULL;
1548 }
1549 }
1550 }
1551 }
1552 }
1553
1554out:
1555 return;
1556}
1557
1558static struct ib_mad_agent_private *
1559find_mad_agent(struct ib_mad_port_private *port_priv,
1560 struct ib_mad *mad)
1561{
1562 struct ib_mad_agent_private *mad_agent = NULL;
1563 unsigned long flags;
1564
1565 spin_lock_irqsave(&port_priv->reg_lock, flags);
1566 if (ib_response_mad(mad)) {
1567 u32 hi_tid;
1568 struct ib_mad_agent_private *entry;
1569
1570 /*
1571 * Routing is based on high 32 bits of transaction ID
1572 * of MAD.
1573 */
1574 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1575 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1576 if (entry->agent.hi_tid == hi_tid) {
1577 mad_agent = entry;
1578 break;
1579 }
1580 }
1581 } else {
1582 struct ib_mad_mgmt_class_table *class;
1583 struct ib_mad_mgmt_method_table *method;
1584 struct ib_mad_mgmt_vendor_class_table *vendor;
1585 struct ib_mad_mgmt_vendor_class *vendor_class;
1586 struct ib_vendor_mad *vendor_mad;
1587 int index;
1588
1589 /*
1590 * Routing is based on version, class, and method
1591 * For "newer" vendor MADs, also based on OUI
1592 */
1593 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1594 goto out;
1595 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1596 class = port_priv->version[
1597 mad->mad_hdr.class_version].class;
1598 if (!class)
1599 goto out;
1600 if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
1601 IB_MGMT_MAX_METHODS)
1602 goto out;
1603 method = class->method_table[convert_mgmt_class(
1604 mad->mad_hdr.mgmt_class)];
1605 if (method)
1606 mad_agent = method->agent[mad->mad_hdr.method &
1607 ~IB_MGMT_METHOD_RESP];
1608 } else {
1609 vendor = port_priv->version[
1610 mad->mad_hdr.class_version].vendor;
1611 if (!vendor)
1612 goto out;
1613 vendor_class = vendor->vendor_class[vendor_class_index(
1614 mad->mad_hdr.mgmt_class)];
1615 if (!vendor_class)
1616 goto out;
1617 /* Find matching OUI */
1618 vendor_mad = (struct ib_vendor_mad *)mad;
1619 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1620 if (index == -1)
1621 goto out;
1622 method = vendor_class->method_table[index];
1623 if (method) {
1624 mad_agent = method->agent[mad->mad_hdr.method &
1625 ~IB_MGMT_METHOD_RESP];
1626 }
1627 }
1628 }
1629
1630 if (mad_agent) {
1631 if (mad_agent->agent.recv_handler)
1632 atomic_inc(&mad_agent->refcount);
1633 else {
1634 printk(KERN_NOTICE PFX "No receive handler for client "
1635 "%p on port %d\n",
1636 &mad_agent->agent, port_priv->port_num);
1637 mad_agent = NULL;
1638 }
1639 }
1640out:
1641 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1642
1643 return mad_agent;
1644}
1645
1646static int validate_mad(struct ib_mad *mad, u32 qp_num)
1647{
1648 int valid = 0;
1649
1650 /* Make sure MAD base version is understood */
1651 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1652 printk(KERN_ERR PFX "MAD received with unsupported base "
1653 "version %d\n", mad->mad_hdr.base_version);
1654 goto out;
1655 }
1656
1657 /* Filter SMI packets sent to other than QP0 */
1658 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1659 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1660 if (qp_num == 0)
1661 valid = 1;
1662 } else {
1663 /* Filter GSI packets sent to QP0 */
1664 if (qp_num != 0)
1665 valid = 1;
1666 }
1667
1668out:
1669 return valid;
1670}
1671
1672static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1673 struct ib_mad_hdr *mad_hdr)
1674{
1675 struct ib_rmpp_mad *rmpp_mad;
1676
1677 rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1678 return !mad_agent_priv->agent.rmpp_version ||
1679 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1680 IB_MGMT_RMPP_FLAG_ACTIVE) ||
1681 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1682}
1683
1684static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1685 struct ib_mad_recv_wc *rwc)
1686{
1687 return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1688 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1689}
1690
1691static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1692 struct ib_mad_send_wr_private *wr,
1693 struct ib_mad_recv_wc *rwc )
1694{
1695 struct ib_ah_attr attr;
1696 u8 send_resp, rcv_resp;
1697 union ib_gid sgid;
1698 struct ib_device *device = mad_agent_priv->agent.device;
1699 u8 port_num = mad_agent_priv->agent.port_num;
1700 u8 lmc;
1701
1702 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1703 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1704
1705 if (send_resp == rcv_resp)
1706 /* both requests, or both responses. GIDs different */
1707 return 0;
1708
1709 if (ib_query_ah(wr->send_buf.ah, &attr))
1710 /* Assume not equal, to avoid false positives. */
1711 return 0;
1712
1713 if (!!(attr.ah_flags & IB_AH_GRH) !=
1714 !!(rwc->wc->wc_flags & IB_WC_GRH))
1715 /* one has GID, other does not. Assume different */
1716 return 0;
1717
1718 if (!send_resp && rcv_resp) {
1719 /* is request/response. */
1720 if (!(attr.ah_flags & IB_AH_GRH)) {
1721 if (ib_get_cached_lmc(device, port_num, &lmc))
1722 return 0;
1723 return (!lmc || !((attr.src_path_bits ^
1724 rwc->wc->dlid_path_bits) &
1725 ((1 << lmc) - 1)));
1726 } else {
1727 if (ib_get_cached_gid(device, port_num,
1728 attr.grh.sgid_index, &sgid))
1729 return 0;
1730 return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1731 16);
1732 }
1733 }
1734
1735 if (!(attr.ah_flags & IB_AH_GRH))
1736 return attr.dlid == rwc->wc->slid;
1737 else
1738 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1739 16);
1740}
1741
1742static inline int is_direct(u8 class)
1743{
1744 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1745}
1746
1747struct ib_mad_send_wr_private*
1748ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1749 struct ib_mad_recv_wc *wc)
1750{
1751 struct ib_mad_send_wr_private *wr;
1752 struct ib_mad *mad;
1753
1754 mad = (struct ib_mad *)wc->recv_buf.mad;
1755
1756 list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1757 if ((wr->tid == mad->mad_hdr.tid) &&
1758 rcv_has_same_class(wr, wc) &&
1759 /*
1760 * Don't check GID for direct routed MADs.
1761 * These might have permissive LIDs.
1762 */
1763 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1764 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1765 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1766 }
1767
1768 /*
1769 * It's possible to receive the response before we've
1770 * been notified that the send has completed
1771 */
1772 list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1773 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1774 wr->tid == mad->mad_hdr.tid &&
1775 wr->timeout &&
1776 rcv_has_same_class(wr, wc) &&
1777 /*
1778 * Don't check GID for direct routed MADs.
1779 * These might have permissive LIDs.
1780 */
1781 (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1782 rcv_has_same_gid(mad_agent_priv, wr, wc)))
1783 /* Verify request has not been canceled */
1784 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1785 }
1786 return NULL;
1787}
1788
1789void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1790{
1791 mad_send_wr->timeout = 0;
1792 if (mad_send_wr->refcount == 1)
1793 list_move_tail(&mad_send_wr->agent_list,
1794 &mad_send_wr->mad_agent_priv->done_list);
1795}
1796
1797static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1798 struct ib_mad_recv_wc *mad_recv_wc)
1799{
1800 struct ib_mad_send_wr_private *mad_send_wr;
1801 struct ib_mad_send_wc mad_send_wc;
1802 unsigned long flags;
1803
1804 INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1805 list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1806 if (mad_agent_priv->agent.rmpp_version) {
1807 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1808 mad_recv_wc);
1809 if (!mad_recv_wc) {
1810 deref_mad_agent(mad_agent_priv);
1811 return;
1812 }
1813 }
1814
1815 /* Complete corresponding request */
1816 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1817 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1818 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1819 if (!mad_send_wr) {
1820 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1821 ib_free_recv_mad(mad_recv_wc);
1822 deref_mad_agent(mad_agent_priv);
1823 return;
1824 }
1825 ib_mark_mad_done(mad_send_wr);
1826 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1827
1828 /* Defined behavior is to complete response before request */
1829 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1830 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1831 mad_recv_wc);
1832 atomic_dec(&mad_agent_priv->refcount);
1833
1834 mad_send_wc.status = IB_WC_SUCCESS;
1835 mad_send_wc.vendor_err = 0;
1836 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1837 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1838 } else {
1839 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1840 mad_recv_wc);
1841 deref_mad_agent(mad_agent_priv);
1842 }
1843}
1844
1845static bool generate_unmatched_resp(struct ib_mad_private *recv,
1846 struct ib_mad_private *response)
1847{
1848 if (recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_GET ||
1849 recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_SET) {
1850 memcpy(response, recv, sizeof *response);
1851 response->header.recv_wc.wc = &response->header.wc;
1852 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1853 response->header.recv_wc.recv_buf.grh = &response->grh;
1854 response->mad.mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
1855 response->mad.mad.mad_hdr.status =
1856 cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1857 if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1858 response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION;
1859
1860 return true;
1861 } else {
1862 return false;
1863 }
1864}
1865static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1866 struct ib_wc *wc)
1867{
1868 struct ib_mad_qp_info *qp_info;
1869 struct ib_mad_private_header *mad_priv_hdr;
1870 struct ib_mad_private *recv, *response = NULL;
1871 struct ib_mad_list_head *mad_list;
1872 struct ib_mad_agent_private *mad_agent;
1873 int port_num;
1874 int ret = IB_MAD_RESULT_SUCCESS;
1875
1876 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1877 qp_info = mad_list->mad_queue->qp_info;
1878 dequeue_mad(mad_list);
1879
1880 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1881 mad_list);
1882 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1883 ib_dma_unmap_single(port_priv->device,
1884 recv->header.mapping,
1885 sizeof(struct ib_mad_private) -
1886 sizeof(struct ib_mad_private_header),
1887 DMA_FROM_DEVICE);
1888
1889 /* Setup MAD receive work completion from "normal" work completion */
1890 recv->header.wc = *wc;
1891 recv->header.recv_wc.wc = &recv->header.wc;
1892 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1893 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1894 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1895
1896 if (atomic_read(&qp_info->snoop_count))
1897 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1898
1899 /* Validate MAD */
1900 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1901 goto out;
1902
1903 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1904 if (!response) {
1905 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1906 "for response buffer\n");
1907 goto out;
1908 }
1909
1910 if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1911 port_num = wc->port_num;
1912 else
1913 port_num = port_priv->port_num;
1914
1915 if (recv->mad.mad.mad_hdr.mgmt_class ==
1916 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1917 enum smi_forward_action retsmi;
1918
1919 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1920 port_priv->device->node_type,
1921 port_num,
1922 port_priv->device->phys_port_cnt) ==
1923 IB_SMI_DISCARD)
1924 goto out;
1925
1926 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1927 if (retsmi == IB_SMI_LOCAL)
1928 goto local;
1929
1930 if (retsmi == IB_SMI_SEND) { /* don't forward */
1931 if (smi_handle_dr_smp_send(&recv->mad.smp,
1932 port_priv->device->node_type,
1933 port_num) == IB_SMI_DISCARD)
1934 goto out;
1935
1936 if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1937 goto out;
1938 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1939 /* forward case for switches */
1940 memcpy(response, recv, sizeof(*response));
1941 response->header.recv_wc.wc = &response->header.wc;
1942 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1943 response->header.recv_wc.recv_buf.grh = &response->grh;
1944
1945 agent_send_response(&response->mad.mad,
1946 &response->grh, wc,
1947 port_priv->device,
1948 smi_get_fwd_port(&recv->mad.smp),
1949 qp_info->qp->qp_num);
1950
1951 goto out;
1952 }
1953 }
1954
1955local:
1956 /* Give driver "right of first refusal" on incoming MAD */
1957 if (port_priv->device->process_mad) {
1958 ret = port_priv->device->process_mad(port_priv->device, 0,
1959 port_priv->port_num,
1960 wc, &recv->grh,
1961 &recv->mad.mad,
1962 &response->mad.mad);
1963 if (ret & IB_MAD_RESULT_SUCCESS) {
1964 if (ret & IB_MAD_RESULT_CONSUMED)
1965 goto out;
1966 if (ret & IB_MAD_RESULT_REPLY) {
1967 agent_send_response(&response->mad.mad,
1968 &recv->grh, wc,
1969 port_priv->device,
1970 port_num,
1971 qp_info->qp->qp_num);
1972 goto out;
1973 }
1974 }
1975 }
1976
1977 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1978 if (mad_agent) {
1979 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1980 /*
1981 * recv is freed up in error cases in ib_mad_complete_recv
1982 * or via recv_handler in ib_mad_complete_recv()
1983 */
1984 recv = NULL;
1985 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
1986 generate_unmatched_resp(recv, response)) {
1987 agent_send_response(&response->mad.mad, &recv->grh, wc,
1988 port_priv->device, port_num, qp_info->qp->qp_num);
1989 }
1990
1991out:
1992 /* Post another receive request for this QP */
1993 if (response) {
1994 ib_mad_post_receive_mads(qp_info, response);
1995 if (recv)
1996 kmem_cache_free(ib_mad_cache, recv);
1997 } else
1998 ib_mad_post_receive_mads(qp_info, recv);
1999}
2000
2001static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2002{
2003 struct ib_mad_send_wr_private *mad_send_wr;
2004 unsigned long delay;
2005
2006 if (list_empty(&mad_agent_priv->wait_list)) {
2007 __cancel_delayed_work(&mad_agent_priv->timed_work);
2008 } else {
2009 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2010 struct ib_mad_send_wr_private,
2011 agent_list);
2012
2013 if (time_after(mad_agent_priv->timeout,
2014 mad_send_wr->timeout)) {
2015 mad_agent_priv->timeout = mad_send_wr->timeout;
2016 __cancel_delayed_work(&mad_agent_priv->timed_work);
2017 delay = mad_send_wr->timeout - jiffies;
2018 if ((long)delay <= 0)
2019 delay = 1;
2020 queue_delayed_work(mad_agent_priv->qp_info->
2021 port_priv->wq,
2022 &mad_agent_priv->timed_work, delay);
2023 }
2024 }
2025}
2026
2027static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2028{
2029 struct ib_mad_agent_private *mad_agent_priv;
2030 struct ib_mad_send_wr_private *temp_mad_send_wr;
2031 struct list_head *list_item;
2032 unsigned long delay;
2033
2034 mad_agent_priv = mad_send_wr->mad_agent_priv;
2035 list_del(&mad_send_wr->agent_list);
2036
2037 delay = mad_send_wr->timeout;
2038 mad_send_wr->timeout += jiffies;
2039
2040 if (delay) {
2041 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2042 temp_mad_send_wr = list_entry(list_item,
2043 struct ib_mad_send_wr_private,
2044 agent_list);
2045 if (time_after(mad_send_wr->timeout,
2046 temp_mad_send_wr->timeout))
2047 break;
2048 }
2049 }
2050 else
2051 list_item = &mad_agent_priv->wait_list;
2052 list_add(&mad_send_wr->agent_list, list_item);
2053
2054 /* Reschedule a work item if we have a shorter timeout */
2055 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2056 __cancel_delayed_work(&mad_agent_priv->timed_work);
2057 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2058 &mad_agent_priv->timed_work, delay);
2059 }
2060}
2061
2062void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2063 int timeout_ms)
2064{
2065 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2066 wait_for_response(mad_send_wr);
2067}
2068
2069/*
2070 * Process a send work completion
2071 */
2072void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2073 struct ib_mad_send_wc *mad_send_wc)
2074{
2075 struct ib_mad_agent_private *mad_agent_priv;
2076 unsigned long flags;
2077 int ret;
2078
2079 mad_agent_priv = mad_send_wr->mad_agent_priv;
2080 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2081 if (mad_agent_priv->agent.rmpp_version) {
2082 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2083 if (ret == IB_RMPP_RESULT_CONSUMED)
2084 goto done;
2085 } else
2086 ret = IB_RMPP_RESULT_UNHANDLED;
2087
2088 if (mad_send_wc->status != IB_WC_SUCCESS &&
2089 mad_send_wr->status == IB_WC_SUCCESS) {
2090 mad_send_wr->status = mad_send_wc->status;
2091 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2092 }
2093
2094 if (--mad_send_wr->refcount > 0) {
2095 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2096 mad_send_wr->status == IB_WC_SUCCESS) {
2097 wait_for_response(mad_send_wr);
2098 }
2099 goto done;
2100 }
2101
2102 /* Remove send from MAD agent and notify client of completion */
2103 list_del(&mad_send_wr->agent_list);
2104 adjust_timeout(mad_agent_priv);
2105 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2106
2107 if (mad_send_wr->status != IB_WC_SUCCESS )
2108 mad_send_wc->status = mad_send_wr->status;
2109 if (ret == IB_RMPP_RESULT_INTERNAL)
2110 ib_rmpp_send_handler(mad_send_wc);
2111 else
2112 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2113 mad_send_wc);
2114
2115 /* Release reference on agent taken when sending */
2116 deref_mad_agent(mad_agent_priv);
2117 return;
2118done:
2119 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2120}
2121
2122static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2123 struct ib_wc *wc)
2124{
2125 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
2126 struct ib_mad_list_head *mad_list;
2127 struct ib_mad_qp_info *qp_info;
2128 struct ib_mad_queue *send_queue;
2129 struct ib_send_wr *bad_send_wr;
2130 struct ib_mad_send_wc mad_send_wc;
2131 unsigned long flags;
2132 int ret;
2133
2134 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2135 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2136 mad_list);
2137 send_queue = mad_list->mad_queue;
2138 qp_info = send_queue->qp_info;
2139
2140retry:
2141 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2142 mad_send_wr->header_mapping,
2143 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2144 ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2145 mad_send_wr->payload_mapping,
2146 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2147 queued_send_wr = NULL;
2148 spin_lock_irqsave(&send_queue->lock, flags);
2149 list_del(&mad_list->list);
2150
2151 /* Move queued send to the send queue */
2152 if (send_queue->count-- > send_queue->max_active) {
2153 mad_list = container_of(qp_info->overflow_list.next,
2154 struct ib_mad_list_head, list);
2155 queued_send_wr = container_of(mad_list,
2156 struct ib_mad_send_wr_private,
2157 mad_list);
2158 list_move_tail(&mad_list->list, &send_queue->list);
2159 }
2160 spin_unlock_irqrestore(&send_queue->lock, flags);
2161
2162 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2163 mad_send_wc.status = wc->status;
2164 mad_send_wc.vendor_err = wc->vendor_err;
2165 if (atomic_read(&qp_info->snoop_count))
2166 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2167 IB_MAD_SNOOP_SEND_COMPLETIONS);
2168 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2169
2170 if (queued_send_wr) {
2171 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2172 &bad_send_wr);
2173 if (ret) {
2174 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2175 mad_send_wr = queued_send_wr;
2176 wc->status = IB_WC_LOC_QP_OP_ERR;
2177 goto retry;
2178 }
2179 }
2180}
2181
2182static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2183{
2184 struct ib_mad_send_wr_private *mad_send_wr;
2185 struct ib_mad_list_head *mad_list;
2186 unsigned long flags;
2187
2188 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2189 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2190 mad_send_wr = container_of(mad_list,
2191 struct ib_mad_send_wr_private,
2192 mad_list);
2193 mad_send_wr->retry = 1;
2194 }
2195 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2196}
2197
2198static void mad_error_handler(struct ib_mad_port_private *port_priv,
2199 struct ib_wc *wc)
2200{
2201 struct ib_mad_list_head *mad_list;
2202 struct ib_mad_qp_info *qp_info;
2203 struct ib_mad_send_wr_private *mad_send_wr;
2204 int ret;
2205
2206 /* Determine if failure was a send or receive */
2207 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2208 qp_info = mad_list->mad_queue->qp_info;
2209 if (mad_list->mad_queue == &qp_info->recv_queue)
2210 /*
2211 * Receive errors indicate that the QP has entered the error
2212 * state - error handling/shutdown code will cleanup
2213 */
2214 return;
2215
2216 /*
2217 * Send errors will transition the QP to SQE - move
2218 * QP to RTS and repost flushed work requests
2219 */
2220 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2221 mad_list);
2222 if (wc->status == IB_WC_WR_FLUSH_ERR) {
2223 if (mad_send_wr->retry) {
2224 /* Repost send */
2225 struct ib_send_wr *bad_send_wr;
2226
2227 mad_send_wr->retry = 0;
2228 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2229 &bad_send_wr);
2230 if (ret)
2231 ib_mad_send_done_handler(port_priv, wc);
2232 } else
2233 ib_mad_send_done_handler(port_priv, wc);
2234 } else {
2235 struct ib_qp_attr *attr;
2236
2237 /* Transition QP to RTS and fail offending send */
2238 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2239 if (attr) {
2240 attr->qp_state = IB_QPS_RTS;
2241 attr->cur_qp_state = IB_QPS_SQE;
2242 ret = ib_modify_qp(qp_info->qp, attr,
2243 IB_QP_STATE | IB_QP_CUR_STATE);
2244 kfree(attr);
2245 if (ret)
2246 printk(KERN_ERR PFX "mad_error_handler - "
2247 "ib_modify_qp to RTS : %d\n", ret);
2248 else
2249 mark_sends_for_retry(qp_info);
2250 }
2251 ib_mad_send_done_handler(port_priv, wc);
2252 }
2253}
2254
2255/*
2256 * IB MAD completion callback
2257 */
2258static void ib_mad_completion_handler(struct work_struct *work)
2259{
2260 struct ib_mad_port_private *port_priv;
2261 struct ib_wc wc;
2262
2263 port_priv = container_of(work, struct ib_mad_port_private, work);
2264 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2265
2266 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2267 if (wc.status == IB_WC_SUCCESS) {
2268 switch (wc.opcode) {
2269 case IB_WC_SEND:
2270 ib_mad_send_done_handler(port_priv, &wc);
2271 break;
2272 case IB_WC_RECV:
2273 ib_mad_recv_done_handler(port_priv, &wc);
2274 break;
2275 default:
2276 BUG_ON(1);
2277 break;
2278 }
2279 } else
2280 mad_error_handler(port_priv, &wc);
2281 }
2282}
2283
2284static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2285{
2286 unsigned long flags;
2287 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2288 struct ib_mad_send_wc mad_send_wc;
2289 struct list_head cancel_list;
2290
2291 INIT_LIST_HEAD(&cancel_list);
2292
2293 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2294 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2295 &mad_agent_priv->send_list, agent_list) {
2296 if (mad_send_wr->status == IB_WC_SUCCESS) {
2297 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2298 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2299 }
2300 }
2301
2302 /* Empty wait list to prevent receives from finding a request */
2303 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2304 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2305
2306 /* Report all cancelled requests */
2307 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2308 mad_send_wc.vendor_err = 0;
2309
2310 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2311 &cancel_list, agent_list) {
2312 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2313 list_del(&mad_send_wr->agent_list);
2314 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2315 &mad_send_wc);
2316 atomic_dec(&mad_agent_priv->refcount);
2317 }
2318}
2319
2320static struct ib_mad_send_wr_private*
2321find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2322 struct ib_mad_send_buf *send_buf)
2323{
2324 struct ib_mad_send_wr_private *mad_send_wr;
2325
2326 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2327 agent_list) {
2328 if (&mad_send_wr->send_buf == send_buf)
2329 return mad_send_wr;
2330 }
2331
2332 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2333 agent_list) {
2334 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2335 &mad_send_wr->send_buf == send_buf)
2336 return mad_send_wr;
2337 }
2338 return NULL;
2339}
2340
2341int ib_modify_mad(struct ib_mad_agent *mad_agent,
2342 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2343{
2344 struct ib_mad_agent_private *mad_agent_priv;
2345 struct ib_mad_send_wr_private *mad_send_wr;
2346 unsigned long flags;
2347 int active;
2348
2349 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2350 agent);
2351 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2352 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2353 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2354 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2355 return -EINVAL;
2356 }
2357
2358 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2359 if (!timeout_ms) {
2360 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2361 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2362 }
2363
2364 mad_send_wr->send_buf.timeout_ms = timeout_ms;
2365 if (active)
2366 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2367 else
2368 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2369
2370 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2371 return 0;
2372}
2373EXPORT_SYMBOL(ib_modify_mad);
2374
2375void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2376 struct ib_mad_send_buf *send_buf)
2377{
2378 ib_modify_mad(mad_agent, send_buf, 0);
2379}
2380EXPORT_SYMBOL(ib_cancel_mad);
2381
2382static void local_completions(struct work_struct *work)
2383{
2384 struct ib_mad_agent_private *mad_agent_priv;
2385 struct ib_mad_local_private *local;
2386 struct ib_mad_agent_private *recv_mad_agent;
2387 unsigned long flags;
2388 int free_mad;
2389 struct ib_wc wc;
2390 struct ib_mad_send_wc mad_send_wc;
2391
2392 mad_agent_priv =
2393 container_of(work, struct ib_mad_agent_private, local_work);
2394
2395 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2396 while (!list_empty(&mad_agent_priv->local_list)) {
2397 local = list_entry(mad_agent_priv->local_list.next,
2398 struct ib_mad_local_private,
2399 completion_list);
2400 list_del(&local->completion_list);
2401 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2402 free_mad = 0;
2403 if (local->mad_priv) {
2404 recv_mad_agent = local->recv_mad_agent;
2405 if (!recv_mad_agent) {
2406 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2407 free_mad = 1;
2408 goto local_send_completion;
2409 }
2410
2411 /*
2412 * Defined behavior is to complete response
2413 * before request
2414 */
2415 build_smp_wc(recv_mad_agent->agent.qp,
2416 (unsigned long) local->mad_send_wr,
2417 be16_to_cpu(IB_LID_PERMISSIVE),
2418 0, recv_mad_agent->agent.port_num, &wc);
2419
2420 local->mad_priv->header.recv_wc.wc = &wc;
2421 local->mad_priv->header.recv_wc.mad_len =
2422 sizeof(struct ib_mad);
2423 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2424 list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2425 &local->mad_priv->header.recv_wc.rmpp_list);
2426 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2427 local->mad_priv->header.recv_wc.recv_buf.mad =
2428 &local->mad_priv->mad.mad;
2429 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2430 snoop_recv(recv_mad_agent->qp_info,
2431 &local->mad_priv->header.recv_wc,
2432 IB_MAD_SNOOP_RECVS);
2433 recv_mad_agent->agent.recv_handler(
2434 &recv_mad_agent->agent,
2435 &local->mad_priv->header.recv_wc);
2436 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2437 atomic_dec(&recv_mad_agent->refcount);
2438 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2439 }
2440
2441local_send_completion:
2442 /* Complete send */
2443 mad_send_wc.status = IB_WC_SUCCESS;
2444 mad_send_wc.vendor_err = 0;
2445 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2446 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2447 snoop_send(mad_agent_priv->qp_info,
2448 &local->mad_send_wr->send_buf,
2449 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2450 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2451 &mad_send_wc);
2452
2453 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2454 atomic_dec(&mad_agent_priv->refcount);
2455 if (free_mad)
2456 kmem_cache_free(ib_mad_cache, local->mad_priv);
2457 kfree(local);
2458 }
2459 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2460}
2461
2462static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2463{
2464 int ret;
2465
2466 if (!mad_send_wr->retries_left)
2467 return -ETIMEDOUT;
2468
2469 mad_send_wr->retries_left--;
2470 mad_send_wr->send_buf.retries++;
2471
2472 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2473
2474 if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2475 ret = ib_retry_rmpp(mad_send_wr);
2476 switch (ret) {
2477 case IB_RMPP_RESULT_UNHANDLED:
2478 ret = ib_send_mad(mad_send_wr);
2479 break;
2480 case IB_RMPP_RESULT_CONSUMED:
2481 ret = 0;
2482 break;
2483 default:
2484 ret = -ECOMM;
2485 break;
2486 }
2487 } else
2488 ret = ib_send_mad(mad_send_wr);
2489
2490 if (!ret) {
2491 mad_send_wr->refcount++;
2492 list_add_tail(&mad_send_wr->agent_list,
2493 &mad_send_wr->mad_agent_priv->send_list);
2494 }
2495 return ret;
2496}
2497
2498static void timeout_sends(struct work_struct *work)
2499{
2500 struct ib_mad_agent_private *mad_agent_priv;
2501 struct ib_mad_send_wr_private *mad_send_wr;
2502 struct ib_mad_send_wc mad_send_wc;
2503 unsigned long flags, delay;
2504
2505 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2506 timed_work.work);
2507 mad_send_wc.vendor_err = 0;
2508
2509 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2510 while (!list_empty(&mad_agent_priv->wait_list)) {
2511 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2512 struct ib_mad_send_wr_private,
2513 agent_list);
2514
2515 if (time_after(mad_send_wr->timeout, jiffies)) {
2516 delay = mad_send_wr->timeout - jiffies;
2517 if ((long)delay <= 0)
2518 delay = 1;
2519 queue_delayed_work(mad_agent_priv->qp_info->
2520 port_priv->wq,
2521 &mad_agent_priv->timed_work, delay);
2522 break;
2523 }
2524
2525 list_del(&mad_send_wr->agent_list);
2526 if (mad_send_wr->status == IB_WC_SUCCESS &&
2527 !retry_send(mad_send_wr))
2528 continue;
2529
2530 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2531
2532 if (mad_send_wr->status == IB_WC_SUCCESS)
2533 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2534 else
2535 mad_send_wc.status = mad_send_wr->status;
2536 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2537 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2538 &mad_send_wc);
2539
2540 atomic_dec(&mad_agent_priv->refcount);
2541 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2542 }
2543 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2544}
2545
2546static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2547{
2548 struct ib_mad_port_private *port_priv = cq->cq_context;
2549 unsigned long flags;
2550
2551 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2552 if (!list_empty(&port_priv->port_list))
2553 queue_work(port_priv->wq, &port_priv->work);
2554 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2555}
2556
2557/*
2558 * Allocate receive MADs and post receive WRs for them
2559 */
2560static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2561 struct ib_mad_private *mad)
2562{
2563 unsigned long flags;
2564 int post, ret;
2565 struct ib_mad_private *mad_priv;
2566 struct ib_sge sg_list;
2567 struct ib_recv_wr recv_wr, *bad_recv_wr;
2568 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2569
2570 /* Initialize common scatter list fields */
2571 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2572 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2573
2574 /* Initialize common receive WR fields */
2575 recv_wr.next = NULL;
2576 recv_wr.sg_list = &sg_list;
2577 recv_wr.num_sge = 1;
2578
2579 do {
2580 /* Allocate and map receive buffer */
2581 if (mad) {
2582 mad_priv = mad;
2583 mad = NULL;
2584 } else {
2585 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2586 if (!mad_priv) {
2587 printk(KERN_ERR PFX "No memory for receive buffer\n");
2588 ret = -ENOMEM;
2589 break;
2590 }
2591 }
2592 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2593 &mad_priv->grh,
2594 sizeof *mad_priv -
2595 sizeof mad_priv->header,
2596 DMA_FROM_DEVICE);
2597 mad_priv->header.mapping = sg_list.addr;
2598 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2599 mad_priv->header.mad_list.mad_queue = recv_queue;
2600
2601 /* Post receive WR */
2602 spin_lock_irqsave(&recv_queue->lock, flags);
2603 post = (++recv_queue->count < recv_queue->max_active);
2604 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2605 spin_unlock_irqrestore(&recv_queue->lock, flags);
2606 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2607 if (ret) {
2608 spin_lock_irqsave(&recv_queue->lock, flags);
2609 list_del(&mad_priv->header.mad_list.list);
2610 recv_queue->count--;
2611 spin_unlock_irqrestore(&recv_queue->lock, flags);
2612 ib_dma_unmap_single(qp_info->port_priv->device,
2613 mad_priv->header.mapping,
2614 sizeof *mad_priv -
2615 sizeof mad_priv->header,
2616 DMA_FROM_DEVICE);
2617 kmem_cache_free(ib_mad_cache, mad_priv);
2618 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2619 break;
2620 }
2621 } while (post);
2622
2623 return ret;
2624}
2625
2626/*
2627 * Return all the posted receive MADs
2628 */
2629static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2630{
2631 struct ib_mad_private_header *mad_priv_hdr;
2632 struct ib_mad_private *recv;
2633 struct ib_mad_list_head *mad_list;
2634
2635 if (!qp_info->qp)
2636 return;
2637
2638 while (!list_empty(&qp_info->recv_queue.list)) {
2639
2640 mad_list = list_entry(qp_info->recv_queue.list.next,
2641 struct ib_mad_list_head, list);
2642 mad_priv_hdr = container_of(mad_list,
2643 struct ib_mad_private_header,
2644 mad_list);
2645 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2646 header);
2647
2648 /* Remove from posted receive MAD list */
2649 list_del(&mad_list->list);
2650
2651 ib_dma_unmap_single(qp_info->port_priv->device,
2652 recv->header.mapping,
2653 sizeof(struct ib_mad_private) -
2654 sizeof(struct ib_mad_private_header),
2655 DMA_FROM_DEVICE);
2656 kmem_cache_free(ib_mad_cache, recv);
2657 }
2658
2659 qp_info->recv_queue.count = 0;
2660}
2661
2662/*
2663 * Start the port
2664 */
2665static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2666{
2667 int ret, i;
2668 struct ib_qp_attr *attr;
2669 struct ib_qp *qp;
2670
2671 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2672 if (!attr) {
2673 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2674 return -ENOMEM;
2675 }
2676
2677 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2678 qp = port_priv->qp_info[i].qp;
2679 if (!qp)
2680 continue;
2681
2682 /*
2683 * PKey index for QP1 is irrelevant but
2684 * one is needed for the Reset to Init transition
2685 */
2686 attr->qp_state = IB_QPS_INIT;
2687 attr->pkey_index = 0;
2688 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2689 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2690 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2691 if (ret) {
2692 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2693 "INIT: %d\n", i, ret);
2694 goto out;
2695 }
2696
2697 attr->qp_state = IB_QPS_RTR;
2698 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2699 if (ret) {
2700 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2701 "RTR: %d\n", i, ret);
2702 goto out;
2703 }
2704
2705 attr->qp_state = IB_QPS_RTS;
2706 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2707 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2708 if (ret) {
2709 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2710 "RTS: %d\n", i, ret);
2711 goto out;
2712 }
2713 }
2714
2715 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2716 if (ret) {
2717 printk(KERN_ERR PFX "Failed to request completion "
2718 "notification: %d\n", ret);
2719 goto out;
2720 }
2721
2722 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2723 if (!port_priv->qp_info[i].qp)
2724 continue;
2725
2726 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2727 if (ret) {
2728 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2729 goto out;
2730 }
2731 }
2732out:
2733 kfree(attr);
2734 return ret;
2735}
2736
2737static void qp_event_handler(struct ib_event *event, void *qp_context)
2738{
2739 struct ib_mad_qp_info *qp_info = qp_context;
2740
2741 /* It's worse than that! He's dead, Jim! */
2742 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2743 event->event, qp_info->qp->qp_num);
2744}
2745
2746static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2747 struct ib_mad_queue *mad_queue)
2748{
2749 mad_queue->qp_info = qp_info;
2750 mad_queue->count = 0;
2751 spin_lock_init(&mad_queue->lock);
2752 INIT_LIST_HEAD(&mad_queue->list);
2753}
2754
2755static void init_mad_qp(struct ib_mad_port_private *port_priv,
2756 struct ib_mad_qp_info *qp_info)
2757{
2758 qp_info->port_priv = port_priv;
2759 init_mad_queue(qp_info, &qp_info->send_queue);
2760 init_mad_queue(qp_info, &qp_info->recv_queue);
2761 INIT_LIST_HEAD(&qp_info->overflow_list);
2762 spin_lock_init(&qp_info->snoop_lock);
2763 qp_info->snoop_table = NULL;
2764 qp_info->snoop_table_size = 0;
2765 atomic_set(&qp_info->snoop_count, 0);
2766}
2767
2768static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2769 enum ib_qp_type qp_type)
2770{
2771 struct ib_qp_init_attr qp_init_attr;
2772 int ret;
2773
2774 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2775 qp_init_attr.send_cq = qp_info->port_priv->cq;
2776 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2777 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2778 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2779 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2780 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2781 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2782 qp_init_attr.qp_type = qp_type;
2783 qp_init_attr.port_num = qp_info->port_priv->port_num;
2784 qp_init_attr.qp_context = qp_info;
2785 qp_init_attr.event_handler = qp_event_handler;
2786 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2787 if (IS_ERR(qp_info->qp)) {
2788 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2789 get_spl_qp_index(qp_type));
2790 ret = PTR_ERR(qp_info->qp);
2791 goto error;
2792 }
2793 /* Use minimum queue sizes unless the CQ is resized */
2794 qp_info->send_queue.max_active = mad_sendq_size;
2795 qp_info->recv_queue.max_active = mad_recvq_size;
2796 return 0;
2797
2798error:
2799 return ret;
2800}
2801
2802static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2803{
2804 if (!qp_info->qp)
2805 return;
2806
2807 ib_destroy_qp(qp_info->qp);
2808 kfree(qp_info->snoop_table);
2809}
2810
2811/*
2812 * Open the port
2813 * Create the QP, PD, MR, and CQ if needed
2814 */
2815static int ib_mad_port_open(struct ib_device *device,
2816 int port_num)
2817{
2818 int ret, cq_size;
2819 struct ib_mad_port_private *port_priv;
2820 unsigned long flags;
2821 char name[sizeof "ib_mad123"];
2822 int has_smi;
2823
2824 /* Create new device info */
2825 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2826 if (!port_priv) {
2827 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2828 return -ENOMEM;
2829 }
2830
2831 port_priv->device = device;
2832 port_priv->port_num = port_num;
2833 spin_lock_init(&port_priv->reg_lock);
2834 INIT_LIST_HEAD(&port_priv->agent_list);
2835 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2836 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2837
2838 cq_size = mad_sendq_size + mad_recvq_size;
2839 has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2840 if (has_smi)
2841 cq_size *= 2;
2842
2843 port_priv->cq = ib_create_cq(port_priv->device,
2844 ib_mad_thread_completion_handler,
2845 NULL, port_priv, cq_size, 0);
2846 if (IS_ERR(port_priv->cq)) {
2847 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2848 ret = PTR_ERR(port_priv->cq);
2849 goto error3;
2850 }
2851
2852 port_priv->pd = ib_alloc_pd(device);
2853 if (IS_ERR(port_priv->pd)) {
2854 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2855 ret = PTR_ERR(port_priv->pd);
2856 goto error4;
2857 }
2858
2859 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2860 if (IS_ERR(port_priv->mr)) {
2861 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2862 ret = PTR_ERR(port_priv->mr);
2863 goto error5;
2864 }
2865
2866 if (has_smi) {
2867 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2868 if (ret)
2869 goto error6;
2870 }
2871 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2872 if (ret)
2873 goto error7;
2874
2875 snprintf(name, sizeof name, "ib_mad%d", port_num);
2876 port_priv->wq = create_singlethread_workqueue(name);
2877 if (!port_priv->wq) {
2878 ret = -ENOMEM;
2879 goto error8;
2880 }
2881 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2882
2883 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2884 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2885 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2886
2887 ret = ib_mad_port_start(port_priv);
2888 if (ret) {
2889 printk(KERN_ERR PFX "Couldn't start port\n");
2890 goto error9;
2891 }
2892
2893 return 0;
2894
2895error9:
2896 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2897 list_del_init(&port_priv->port_list);
2898 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2899
2900 destroy_workqueue(port_priv->wq);
2901error8:
2902 destroy_mad_qp(&port_priv->qp_info[1]);
2903error7:
2904 destroy_mad_qp(&port_priv->qp_info[0]);
2905error6:
2906 ib_dereg_mr(port_priv->mr);
2907error5:
2908 ib_dealloc_pd(port_priv->pd);
2909error4:
2910 ib_destroy_cq(port_priv->cq);
2911 cleanup_recv_queue(&port_priv->qp_info[1]);
2912 cleanup_recv_queue(&port_priv->qp_info[0]);
2913error3:
2914 kfree(port_priv);
2915
2916 return ret;
2917}
2918
2919/*
2920 * Close the port
2921 * If there are no classes using the port, free the port
2922 * resources (CQ, MR, PD, QP) and remove the port's info structure
2923 */
2924static int ib_mad_port_close(struct ib_device *device, int port_num)
2925{
2926 struct ib_mad_port_private *port_priv;
2927 unsigned long flags;
2928
2929 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2930 port_priv = __ib_get_mad_port(device, port_num);
2931 if (port_priv == NULL) {
2932 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2933 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2934 return -ENODEV;
2935 }
2936 list_del_init(&port_priv->port_list);
2937 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2938
2939 destroy_workqueue(port_priv->wq);
2940 destroy_mad_qp(&port_priv->qp_info[1]);
2941 destroy_mad_qp(&port_priv->qp_info[0]);
2942 ib_dereg_mr(port_priv->mr);
2943 ib_dealloc_pd(port_priv->pd);
2944 ib_destroy_cq(port_priv->cq);
2945 cleanup_recv_queue(&port_priv->qp_info[1]);
2946 cleanup_recv_queue(&port_priv->qp_info[0]);
2947 /* XXX: Handle deallocation of MAD registration tables */
2948
2949 kfree(port_priv);
2950
2951 return 0;
2952}
2953
2954static void ib_mad_init_device(struct ib_device *device)
2955{
2956 int start, end, i;
2957
2958 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2959 return;
2960
2961 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2962 start = 0;
2963 end = 0;
2964 } else {
2965 start = 1;
2966 end = device->phys_port_cnt;
2967 }
2968
2969 for (i = start; i <= end; i++) {
2970 if (ib_mad_port_open(device, i)) {
2971 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2972 device->name, i);
2973 goto error;
2974 }
2975 if (ib_agent_port_open(device, i)) {
2976 printk(KERN_ERR PFX "Couldn't open %s port %d "
2977 "for agents\n",
2978 device->name, i);
2979 goto error_agent;
2980 }
2981 }
2982 return;
2983
2984error_agent:
2985 if (ib_mad_port_close(device, i))
2986 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2987 device->name, i);
2988
2989error:
2990 i--;
2991
2992 while (i >= start) {
2993 if (ib_agent_port_close(device, i))
2994 printk(KERN_ERR PFX "Couldn't close %s port %d "
2995 "for agents\n",
2996 device->name, i);
2997 if (ib_mad_port_close(device, i))
2998 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2999 device->name, i);
3000 i--;
3001 }
3002}
3003
3004static void ib_mad_remove_device(struct ib_device *device)
3005{
3006 int i, num_ports, cur_port;
3007
3008 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3009 return;
3010
3011 if (device->node_type == RDMA_NODE_IB_SWITCH) {
3012 num_ports = 1;
3013 cur_port = 0;
3014 } else {
3015 num_ports = device->phys_port_cnt;
3016 cur_port = 1;
3017 }
3018 for (i = 0; i < num_ports; i++, cur_port++) {
3019 if (ib_agent_port_close(device, cur_port))
3020 printk(KERN_ERR PFX "Couldn't close %s port %d "
3021 "for agents\n",
3022 device->name, cur_port);
3023 if (ib_mad_port_close(device, cur_port))
3024 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
3025 device->name, cur_port);
3026 }
3027}
3028
3029static struct ib_client mad_client = {
3030 .name = "mad",
3031 .add = ib_mad_init_device,
3032 .remove = ib_mad_remove_device
3033};
3034
3035static int __init ib_mad_init_module(void)
3036{
3037 int ret;
3038
3039 mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3040 mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3041
3042 mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3043 mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3044
3045 ib_mad_cache = kmem_cache_create("ib_mad",
3046 sizeof(struct ib_mad_private),
3047 0,
3048 SLAB_HWCACHE_ALIGN,
3049 NULL);
3050 if (!ib_mad_cache) {
3051 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3052 ret = -ENOMEM;
3053 goto error1;
3054 }
3055
3056 INIT_LIST_HEAD(&ib_mad_port_list);
3057
3058 if (ib_register_client(&mad_client)) {
3059 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3060 ret = -EINVAL;
3061 goto error2;
3062 }
3063
3064 return 0;
3065
3066error2:
3067 kmem_cache_destroy(ib_mad_cache);
3068error1:
3069 return ret;
3070}
3071
3072static void __exit ib_mad_cleanup_module(void)
3073{
3074 ib_unregister_client(&mad_client);
3075 kmem_cache_destroy(ib_mad_cache);
3076}
3077
3078module_init(ib_mad_init_module);
3079module_exit(ib_mad_cleanup_module);