2 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * $Id: mad.c 1389 2004-12-27 22:56:47Z roland $
35 #include <linux/dma-mapping.h>
36 #include <linux/interrupt.h>
44 MODULE_LICENSE("Dual BSD/GPL");
45 MODULE_DESCRIPTION("kernel IB MAD API");
46 MODULE_AUTHOR("Hal Rosenstock");
47 MODULE_AUTHOR("Sean Hefty");
50 kmem_cache_t *ib_mad_cache;
51 static struct list_head ib_mad_port_list;
52 static u32 ib_mad_client_id = 0;
55 static spinlock_t ib_mad_port_list_lock;
58 /* Forward declarations */
59 static int method_in_use(struct ib_mad_mgmt_method_table **method,
60 struct ib_mad_reg_req *mad_reg_req);
61 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
62 static struct ib_mad_agent_private *find_mad_agent(
63 struct ib_mad_port_private *port_priv,
64 struct ib_mad *mad, int solicited);
65 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
66 struct ib_mad_private *mad);
67 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
68 static void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
69 struct ib_mad_send_wc *mad_send_wc);
70 static void timeout_sends(void *data);
71 static void cancel_sends(void *data);
72 static void local_completions(void *data);
73 static int solicited_mad(struct ib_mad *mad);
74 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
75 struct ib_mad_agent_private *agent_priv,
77 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
78 struct ib_mad_agent_private *agent_priv);
81 * Returns a ib_mad_port_private structure or NULL for a device/port
82 * Assumes ib_mad_port_list_lock is being held
84 static inline struct ib_mad_port_private *
85 __ib_get_mad_port(struct ib_device *device, int port_num)
87 struct ib_mad_port_private *entry;
89 list_for_each_entry(entry, &ib_mad_port_list, port_list) {
90 if (entry->device == device && entry->port_num == port_num)
97 * Wrapper function to return a ib_mad_port_private structure or NULL
100 static inline struct ib_mad_port_private *
101 ib_get_mad_port(struct ib_device *device, int port_num)
103 struct ib_mad_port_private *entry;
106 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
107 entry = __ib_get_mad_port(device, port_num);
108 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
113 static inline u8 convert_mgmt_class(u8 mgmt_class)
115 /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
116 return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
120 static int get_spl_qp_index(enum ib_qp_type qp_type)
133 static int vendor_class_index(u8 mgmt_class)
135 return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
138 static int is_vendor_class(u8 mgmt_class)
140 if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
141 (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
146 static int is_vendor_oui(char *oui)
148 if (oui[0] || oui[1] || oui[2])
153 static int is_vendor_method_in_use(
154 struct ib_mad_mgmt_vendor_class *vendor_class,
155 struct ib_mad_reg_req *mad_reg_req)
157 struct ib_mad_mgmt_method_table *method;
160 for (i = 0; i < MAX_MGMT_OUI; i++) {
161 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
162 method = vendor_class->method_table[i];
164 if (method_in_use(&method, mad_reg_req))
175 * ib_register_mad_agent - Register to send/receive MADs
177 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
179 enum ib_qp_type qp_type,
180 struct ib_mad_reg_req *mad_reg_req,
182 ib_mad_send_handler send_handler,
183 ib_mad_recv_handler recv_handler,
186 struct ib_mad_port_private *port_priv;
187 struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
188 struct ib_mad_agent_private *mad_agent_priv;
189 struct ib_mad_reg_req *reg_req = NULL;
190 struct ib_mad_mgmt_class_table *class;
191 struct ib_mad_mgmt_vendor_class_table *vendor;
192 struct ib_mad_mgmt_vendor_class *vendor_class;
193 struct ib_mad_mgmt_method_table *method;
196 u8 mgmt_class, vclass;
198 /* Validate parameters */
199 qpn = get_spl_qp_index(qp_type);
204 goto error1; /* XXX: until RMPP implemented */
206 /* Validate MAD registration request if supplied */
208 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
212 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
214 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
215 * one in this range currently allowed
217 if (mad_reg_req->mgmt_class !=
218 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
220 } else if (mad_reg_req->mgmt_class == 0) {
222 * Class 0 is reserved in IBA and is used for
223 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
226 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
228 * If class is in "new" vendor range,
229 * ensure supplied OUI is not zero
231 if (!is_vendor_oui(mad_reg_req->oui))
234 /* Make sure class supplied is consistent with QP type */
235 if (qp_type == IB_QPT_SMI) {
236 if ((mad_reg_req->mgmt_class !=
237 IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
238 (mad_reg_req->mgmt_class !=
239 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
242 if ((mad_reg_req->mgmt_class ==
243 IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
244 (mad_reg_req->mgmt_class ==
245 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
249 /* No registration request supplied */
254 /* Validate device and port */
255 port_priv = ib_get_mad_port(device, port_num);
257 ret = ERR_PTR(-ENODEV);
261 /* Allocate structures */
262 mad_agent_priv = kmalloc(sizeof *mad_agent_priv, GFP_KERNEL);
263 if (!mad_agent_priv) {
264 ret = ERR_PTR(-ENOMEM);
269 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
271 ret = ERR_PTR(-ENOMEM);
274 /* Make a copy of the MAD registration request */
275 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
278 /* Now, fill in the various structures */
279 memset(mad_agent_priv, 0, sizeof *mad_agent_priv);
280 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
281 mad_agent_priv->reg_req = reg_req;
282 mad_agent_priv->rmpp_version = rmpp_version;
283 mad_agent_priv->agent.device = device;
284 mad_agent_priv->agent.recv_handler = recv_handler;
285 mad_agent_priv->agent.send_handler = send_handler;
286 mad_agent_priv->agent.context = context;
287 mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
288 mad_agent_priv->agent.port_num = port_num;
290 spin_lock_irqsave(&port_priv->reg_lock, flags);
291 mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
294 * Make sure MAD registration (if supplied)
295 * is non overlapping with any existing ones
298 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
299 if (!is_vendor_class(mgmt_class)) {
300 class = port_priv->version[mad_reg_req->
301 mgmt_class_version].class;
303 method = class->method_table[mgmt_class];
305 if (method_in_use(&method,
310 ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
313 /* "New" vendor class range */
314 vendor = port_priv->version[mad_reg_req->
315 mgmt_class_version].vendor;
317 vclass = vendor_class_index(mgmt_class);
318 vendor_class = vendor->vendor_class[vclass];
320 if (is_vendor_method_in_use(
326 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
334 /* Add mad agent into port's agent list */
335 list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
336 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
338 spin_lock_init(&mad_agent_priv->lock);
339 INIT_LIST_HEAD(&mad_agent_priv->send_list);
340 INIT_LIST_HEAD(&mad_agent_priv->wait_list);
341 INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
342 INIT_LIST_HEAD(&mad_agent_priv->local_list);
343 INIT_WORK(&mad_agent_priv->local_work, local_completions,
345 INIT_LIST_HEAD(&mad_agent_priv->canceled_list);
346 INIT_WORK(&mad_agent_priv->canceled_work, cancel_sends, mad_agent_priv);
347 atomic_set(&mad_agent_priv->refcount, 1);
348 init_waitqueue_head(&mad_agent_priv->wait);
350 return &mad_agent_priv->agent;
353 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
356 kfree(mad_agent_priv);
360 EXPORT_SYMBOL(ib_register_mad_agent);
362 static inline int is_snooping_sends(int mad_snoop_flags)
364 return (mad_snoop_flags &
365 (/*IB_MAD_SNOOP_POSTED_SENDS |
366 IB_MAD_SNOOP_RMPP_SENDS |*/
367 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
368 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
371 static inline int is_snooping_recvs(int mad_snoop_flags)
373 return (mad_snoop_flags &
374 (IB_MAD_SNOOP_RECVS /*|
375 IB_MAD_SNOOP_RMPP_RECVS*/));
378 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
379 struct ib_mad_snoop_private *mad_snoop_priv)
381 struct ib_mad_snoop_private **new_snoop_table;
385 spin_lock_irqsave(&qp_info->snoop_lock, flags);
386 /* Check for empty slot in array. */
387 for (i = 0; i < qp_info->snoop_table_size; i++)
388 if (!qp_info->snoop_table[i])
391 if (i == qp_info->snoop_table_size) {
393 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
394 qp_info->snoop_table_size + 1,
396 if (!new_snoop_table) {
400 if (qp_info->snoop_table) {
401 memcpy(new_snoop_table, qp_info->snoop_table,
402 sizeof mad_snoop_priv *
403 qp_info->snoop_table_size);
404 kfree(qp_info->snoop_table);
406 qp_info->snoop_table = new_snoop_table;
407 qp_info->snoop_table_size++;
409 qp_info->snoop_table[i] = mad_snoop_priv;
410 atomic_inc(&qp_info->snoop_count);
412 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
416 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
418 enum ib_qp_type qp_type,
420 ib_mad_snoop_handler snoop_handler,
421 ib_mad_recv_handler recv_handler,
424 struct ib_mad_port_private *port_priv;
425 struct ib_mad_agent *ret;
426 struct ib_mad_snoop_private *mad_snoop_priv;
429 /* Validate parameters */
430 if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
431 (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
432 ret = ERR_PTR(-EINVAL);
435 qpn = get_spl_qp_index(qp_type);
437 ret = ERR_PTR(-EINVAL);
440 port_priv = ib_get_mad_port(device, port_num);
442 ret = ERR_PTR(-ENODEV);
445 /* Allocate structures */
446 mad_snoop_priv = kmalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
447 if (!mad_snoop_priv) {
448 ret = ERR_PTR(-ENOMEM);
452 /* Now, fill in the various structures */
453 memset(mad_snoop_priv, 0, sizeof *mad_snoop_priv);
454 mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
455 mad_snoop_priv->agent.device = device;
456 mad_snoop_priv->agent.recv_handler = recv_handler;
457 mad_snoop_priv->agent.snoop_handler = snoop_handler;
458 mad_snoop_priv->agent.context = context;
459 mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
460 mad_snoop_priv->agent.port_num = port_num;
461 mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
462 init_waitqueue_head(&mad_snoop_priv->wait);
463 mad_snoop_priv->snoop_index = register_snoop_agent(
464 &port_priv->qp_info[qpn],
466 if (mad_snoop_priv->snoop_index < 0) {
467 ret = ERR_PTR(mad_snoop_priv->snoop_index);
471 atomic_set(&mad_snoop_priv->refcount, 1);
472 return &mad_snoop_priv->agent;
475 kfree(mad_snoop_priv);
479 EXPORT_SYMBOL(ib_register_mad_snoop);
481 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
483 struct ib_mad_port_private *port_priv;
486 /* Note that we could still be handling received MADs */
489 * Canceling all sends results in dropping received response
490 * MADs, preventing us from queuing additional work
492 cancel_mads(mad_agent_priv);
494 port_priv = mad_agent_priv->qp_info->port_priv;
496 cancel_delayed_work(&mad_agent_priv->timed_work);
497 flush_workqueue(port_priv->wq);
499 spin_lock_irqsave(&port_priv->reg_lock, flags);
500 remove_mad_reg_req(mad_agent_priv);
501 list_del(&mad_agent_priv->agent_list);
502 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
504 /* XXX: Cleanup pending RMPP receives for this agent */
506 atomic_dec(&mad_agent_priv->refcount);
507 wait_event(mad_agent_priv->wait,
508 !atomic_read(&mad_agent_priv->refcount));
510 if (mad_agent_priv->reg_req)
511 kfree(mad_agent_priv->reg_req);
512 kfree(mad_agent_priv);
515 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
517 struct ib_mad_qp_info *qp_info;
520 qp_info = mad_snoop_priv->qp_info;
521 spin_lock_irqsave(&qp_info->snoop_lock, flags);
522 qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
523 atomic_dec(&qp_info->snoop_count);
524 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
526 atomic_dec(&mad_snoop_priv->refcount);
527 wait_event(mad_snoop_priv->wait,
528 !atomic_read(&mad_snoop_priv->refcount));
530 kfree(mad_snoop_priv);
534 * ib_unregister_mad_agent - Unregisters a client from using MAD services
536 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
538 struct ib_mad_agent_private *mad_agent_priv;
539 struct ib_mad_snoop_private *mad_snoop_priv;
541 /* If the TID is zero, the agent can only snoop. */
542 if (mad_agent->hi_tid) {
543 mad_agent_priv = container_of(mad_agent,
544 struct ib_mad_agent_private,
546 unregister_mad_agent(mad_agent_priv);
548 mad_snoop_priv = container_of(mad_agent,
549 struct ib_mad_snoop_private,
551 unregister_mad_snoop(mad_snoop_priv);
555 EXPORT_SYMBOL(ib_unregister_mad_agent);
557 static void dequeue_mad(struct ib_mad_list_head *mad_list)
559 struct ib_mad_queue *mad_queue;
562 BUG_ON(!mad_list->mad_queue);
563 mad_queue = mad_list->mad_queue;
564 spin_lock_irqsave(&mad_queue->lock, flags);
565 list_del(&mad_list->list);
567 spin_unlock_irqrestore(&mad_queue->lock, flags);
570 static void snoop_send(struct ib_mad_qp_info *qp_info,
571 struct ib_send_wr *send_wr,
572 struct ib_mad_send_wc *mad_send_wc,
575 struct ib_mad_snoop_private *mad_snoop_priv;
579 spin_lock_irqsave(&qp_info->snoop_lock, flags);
580 for (i = 0; i < qp_info->snoop_table_size; i++) {
581 mad_snoop_priv = qp_info->snoop_table[i];
582 if (!mad_snoop_priv ||
583 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
586 atomic_inc(&mad_snoop_priv->refcount);
587 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
588 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
589 send_wr, mad_send_wc);
590 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
591 wake_up(&mad_snoop_priv->wait);
592 spin_lock_irqsave(&qp_info->snoop_lock, flags);
594 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
597 static void snoop_recv(struct ib_mad_qp_info *qp_info,
598 struct ib_mad_recv_wc *mad_recv_wc,
601 struct ib_mad_snoop_private *mad_snoop_priv;
605 spin_lock_irqsave(&qp_info->snoop_lock, flags);
606 for (i = 0; i < qp_info->snoop_table_size; i++) {
607 mad_snoop_priv = qp_info->snoop_table[i];
608 if (!mad_snoop_priv ||
609 !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
612 atomic_inc(&mad_snoop_priv->refcount);
613 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
614 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
616 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
617 wake_up(&mad_snoop_priv->wait);
618 spin_lock_irqsave(&qp_info->snoop_lock, flags);
620 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
623 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
626 memset(wc, 0, sizeof *wc);
628 wc->status = IB_WC_SUCCESS;
629 wc->opcode = IB_WC_RECV;
630 wc->pkey_index = pkey_index;
631 wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
636 wc->dlid_path_bits = 0;
637 wc->port_num = port_num;
641 * Return 0 if SMP is to be sent
642 * Return 1 if SMP was consumed locally (whether or not solicited)
643 * Return < 0 if error
645 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
647 struct ib_send_wr *send_wr)
651 struct ib_mad_local_private *local;
652 struct ib_mad_private *mad_priv;
653 struct ib_mad_port_private *port_priv;
654 struct ib_mad_agent_private *recv_mad_agent = NULL;
655 struct ib_device *device = mad_agent_priv->agent.device;
656 u8 port_num = mad_agent_priv->agent.port_num;
659 if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
661 printk(KERN_ERR PFX "Invalid directed route\n");
664 /* Check to post send on QP or process locally */
665 ret = smi_check_local_dr_smp(smp, device, port_num);
666 if (!ret || !device->process_mad)
669 local = kmalloc(sizeof *local, GFP_ATOMIC);
672 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
675 local->mad_priv = NULL;
676 local->recv_mad_agent = NULL;
677 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
680 printk(KERN_ERR PFX "No memory for local response MAD\n");
685 build_smp_wc(send_wr->wr_id, smp->dr_slid, send_wr->wr.ud.pkey_index,
686 send_wr->wr.ud.port_num, &mad_wc);
688 /* No GRH for DR SMP */
689 ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
690 (struct ib_mad *)smp,
691 (struct ib_mad *)&mad_priv->mad);
694 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
696 * See if response is solicited and
697 * there is a recv handler
699 if (solicited_mad(&mad_priv->mad.mad) &&
700 mad_agent_priv->agent.recv_handler) {
701 local->mad_priv = mad_priv;
702 local->recv_mad_agent = mad_agent_priv;
704 * Reference MAD agent until receive
705 * side of local completion handled
707 atomic_inc(&mad_agent_priv->refcount);
709 kmem_cache_free(ib_mad_cache, mad_priv);
711 case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
712 kmem_cache_free(ib_mad_cache, mad_priv);
714 case IB_MAD_RESULT_SUCCESS:
715 /* Treat like an incoming receive MAD */
716 solicited = solicited_mad(&mad_priv->mad.mad);
717 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
718 mad_agent_priv->agent.port_num);
720 mad_priv->mad.mad.mad_hdr.tid =
721 ((struct ib_mad *)smp)->mad_hdr.tid;
722 recv_mad_agent = find_mad_agent(port_priv,
726 if (!port_priv || !recv_mad_agent) {
727 kmem_cache_free(ib_mad_cache, mad_priv);
732 local->mad_priv = mad_priv;
733 local->recv_mad_agent = recv_mad_agent;
736 kmem_cache_free(ib_mad_cache, mad_priv);
742 local->send_wr = *send_wr;
743 local->send_wr.sg_list = local->sg_list;
744 memcpy(local->sg_list, send_wr->sg_list,
745 sizeof *send_wr->sg_list * send_wr->num_sge);
746 local->send_wr.next = NULL;
747 local->tid = send_wr->wr.ud.mad_hdr->tid;
748 local->wr_id = send_wr->wr_id;
749 /* Reference MAD agent until send side of local completion handled */
750 atomic_inc(&mad_agent_priv->refcount);
751 /* Queue local completion to local list */
752 spin_lock_irqsave(&mad_agent_priv->lock, flags);
753 list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
754 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
755 queue_work(mad_agent_priv->qp_info->port_priv->wq,
756 &mad_agent_priv->local_work);
762 static int ib_send_mad(struct ib_mad_agent_private *mad_agent_priv,
763 struct ib_mad_send_wr_private *mad_send_wr)
765 struct ib_mad_qp_info *qp_info;
766 struct ib_send_wr *bad_send_wr;
770 /* Replace user's WR ID with our own to find WR upon completion */
771 qp_info = mad_agent_priv->qp_info;
772 mad_send_wr->wr_id = mad_send_wr->send_wr.wr_id;
773 mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
774 mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
776 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
777 if (qp_info->send_queue.count++ < qp_info->send_queue.max_active) {
778 list_add_tail(&mad_send_wr->mad_list.list,
779 &qp_info->send_queue.list);
780 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
781 ret = ib_post_send(mad_agent_priv->agent.qp,
782 &mad_send_wr->send_wr, &bad_send_wr);
784 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
785 dequeue_mad(&mad_send_wr->mad_list);
788 list_add_tail(&mad_send_wr->mad_list.list,
789 &qp_info->overflow_list);
790 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
797 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
798 * with the registered client
800 int ib_post_send_mad(struct ib_mad_agent *mad_agent,
801 struct ib_send_wr *send_wr,
802 struct ib_send_wr **bad_send_wr)
805 struct ib_mad_agent_private *mad_agent_priv;
807 /* Validate supplied parameters */
811 if (!mad_agent || !send_wr)
814 if (!mad_agent->send_handler)
817 mad_agent_priv = container_of(mad_agent,
818 struct ib_mad_agent_private,
821 /* Walk list of send WRs and post each on send list */
824 struct ib_send_wr *next_send_wr;
825 struct ib_mad_send_wr_private *mad_send_wr;
828 /* Validate more parameters */
829 if (send_wr->num_sge > IB_MAD_SEND_REQ_MAX_SG)
832 if (send_wr->wr.ud.timeout_ms && !mad_agent->recv_handler)
835 if (!send_wr->wr.ud.mad_hdr) {
836 printk(KERN_ERR PFX "MAD header must be supplied "
837 "in WR %p\n", send_wr);
842 * Save pointer to next work request to post in case the
843 * current one completes, and the user modifies the work
844 * request associated with the completion
846 next_send_wr = (struct ib_send_wr *)send_wr->next;
848 smp = (struct ib_smp *)send_wr->wr.ud.mad_hdr;
849 if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
850 ret = handle_outgoing_dr_smp(mad_agent_priv, smp,
852 if (ret < 0) /* error */
854 else if (ret == 1) /* locally consumed */
858 /* Allocate MAD send WR tracking structure */
859 mad_send_wr = kmalloc(sizeof *mad_send_wr, GFP_ATOMIC);
861 printk(KERN_ERR PFX "No memory for "
862 "ib_mad_send_wr_private\n");
867 mad_send_wr->send_wr = *send_wr;
868 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
869 memcpy(mad_send_wr->sg_list, send_wr->sg_list,
870 sizeof *send_wr->sg_list * send_wr->num_sge);
871 mad_send_wr->send_wr.next = NULL;
872 mad_send_wr->tid = send_wr->wr.ud.mad_hdr->tid;
873 mad_send_wr->agent = mad_agent;
874 /* Timeout will be updated after send completes */
875 mad_send_wr->timeout = msecs_to_jiffies(send_wr->wr.
877 mad_send_wr->retry = 0;
878 /* One reference for each work request to QP + response */
879 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
880 mad_send_wr->status = IB_WC_SUCCESS;
882 /* Reference MAD agent until send completes */
883 atomic_inc(&mad_agent_priv->refcount);
884 spin_lock_irqsave(&mad_agent_priv->lock, flags);
885 list_add_tail(&mad_send_wr->agent_list,
886 &mad_agent_priv->send_list);
887 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
889 ret = ib_send_mad(mad_agent_priv, mad_send_wr);
891 /* Fail send request */
892 spin_lock_irqsave(&mad_agent_priv->lock, flags);
893 list_del(&mad_send_wr->agent_list);
894 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
895 atomic_dec(&mad_agent_priv->refcount);
899 send_wr = next_send_wr;
904 *bad_send_wr = send_wr;
908 EXPORT_SYMBOL(ib_post_send_mad);
911 * ib_free_recv_mad - Returns data buffers used to receive
912 * a MAD to the access layer
914 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
916 struct ib_mad_recv_buf *entry;
917 struct ib_mad_private_header *mad_priv_hdr;
918 struct ib_mad_private *priv;
920 mad_priv_hdr = container_of(mad_recv_wc,
921 struct ib_mad_private_header,
923 priv = container_of(mad_priv_hdr, struct ib_mad_private, header);
926 * Walk receive buffer list associated with this WC
927 * No need to remove them from list of receive buffers
929 list_for_each_entry(entry, &mad_recv_wc->recv_buf.list, list) {
930 /* Free previous receive buffer */
931 kmem_cache_free(ib_mad_cache, priv);
932 mad_priv_hdr = container_of(mad_recv_wc,
933 struct ib_mad_private_header,
935 priv = container_of(mad_priv_hdr, struct ib_mad_private,
939 /* Free last buffer */
940 kmem_cache_free(ib_mad_cache, priv);
942 EXPORT_SYMBOL(ib_free_recv_mad);
944 void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc,
947 printk(KERN_ERR PFX "ib_coalesce_recv_mad() not implemented yet\n");
949 EXPORT_SYMBOL(ib_coalesce_recv_mad);
951 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
953 ib_mad_send_handler send_handler,
954 ib_mad_recv_handler recv_handler,
957 return ERR_PTR(-EINVAL); /* XXX: for now */
959 EXPORT_SYMBOL(ib_redirect_mad_qp);
961 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
964 printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
967 EXPORT_SYMBOL(ib_process_mad_wc);
969 static int method_in_use(struct ib_mad_mgmt_method_table **method,
970 struct ib_mad_reg_req *mad_reg_req)
974 for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
975 i < IB_MGMT_MAX_METHODS;
976 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
978 if ((*method)->agent[i]) {
979 printk(KERN_ERR PFX "Method %d already in use\n", i);
986 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
988 /* Allocate management method table */
989 *method = kmalloc(sizeof **method, GFP_ATOMIC);
991 printk(KERN_ERR PFX "No memory for "
992 "ib_mad_mgmt_method_table\n");
995 /* Clear management method table */
996 memset(*method, 0, sizeof **method);
1002 * Check to see if there are any methods still in use
1004 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1008 for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1009 if (method->agent[i])
1015 * Check to see if there are any method tables for this class still in use
1017 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1021 for (i = 0; i < MAX_MGMT_CLASS; i++)
1022 if (class->method_table[i])
1027 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1031 for (i = 0; i < MAX_MGMT_OUI; i++)
1032 if (vendor_class->method_table[i])
1037 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1042 for (i = 0; i < MAX_MGMT_OUI; i++)
1043 /* Is there matching OUI for this vendor class ? */
1044 if (!memcmp(vendor_class->oui[i], oui, 3))
1050 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1054 for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1055 if (vendor->vendor_class[i])
1061 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1062 struct ib_mad_agent_private *agent)
1066 /* Remove any methods for this mad agent */
1067 for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1068 if (method->agent[i] == agent) {
1069 method->agent[i] = NULL;
1074 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1075 struct ib_mad_agent_private *agent_priv,
1078 struct ib_mad_port_private *port_priv;
1079 struct ib_mad_mgmt_class_table **class;
1080 struct ib_mad_mgmt_method_table **method;
1083 port_priv = agent_priv->qp_info->port_priv;
1084 class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1086 /* Allocate management class table for "new" class version */
1087 *class = kmalloc(sizeof **class, GFP_ATOMIC);
1089 printk(KERN_ERR PFX "No memory for "
1090 "ib_mad_mgmt_class_table\n");
1094 /* Clear management class table */
1095 memset(*class, 0, sizeof(**class));
1096 /* Allocate method table for this management class */
1097 method = &(*class)->method_table[mgmt_class];
1098 if ((ret = allocate_method_table(method)))
1101 method = &(*class)->method_table[mgmt_class];
1103 /* Allocate method table for this management class */
1104 if ((ret = allocate_method_table(method)))
1109 /* Now, make sure methods are not already in use */
1110 if (method_in_use(method, mad_reg_req))
1113 /* Finally, add in methods being registered */
1114 for (i = find_first_bit(mad_reg_req->method_mask,
1115 IB_MGMT_MAX_METHODS);
1116 i < IB_MGMT_MAX_METHODS;
1117 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1119 (*method)->agent[i] = agent_priv;
1124 /* Remove any methods for this mad agent */
1125 remove_methods_mad_agent(*method, agent_priv);
1126 /* Now, check to see if there are any methods in use */
1127 if (!check_method_table(*method)) {
1128 /* If not, release management method table */
1141 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1142 struct ib_mad_agent_private *agent_priv)
1144 struct ib_mad_port_private *port_priv;
1145 struct ib_mad_mgmt_vendor_class_table **vendor_table;
1146 struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1147 struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1148 struct ib_mad_mgmt_method_table **method;
1149 int i, ret = -ENOMEM;
1152 /* "New" vendor (with OUI) class */
1153 vclass = vendor_class_index(mad_reg_req->mgmt_class);
1154 port_priv = agent_priv->qp_info->port_priv;
1155 vendor_table = &port_priv->version[
1156 mad_reg_req->mgmt_class_version].vendor;
1157 if (!*vendor_table) {
1158 /* Allocate mgmt vendor class table for "new" class version */
1159 vendor = kmalloc(sizeof *vendor, GFP_ATOMIC);
1161 printk(KERN_ERR PFX "No memory for "
1162 "ib_mad_mgmt_vendor_class_table\n");
1165 /* Clear management vendor class table */
1166 memset(vendor, 0, sizeof(*vendor));
1167 *vendor_table = vendor;
1169 if (!(*vendor_table)->vendor_class[vclass]) {
1170 /* Allocate table for this management vendor class */
1171 vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC);
1172 if (!vendor_class) {
1173 printk(KERN_ERR PFX "No memory for "
1174 "ib_mad_mgmt_vendor_class\n");
1177 memset(vendor_class, 0, sizeof(*vendor_class));
1178 (*vendor_table)->vendor_class[vclass] = vendor_class;
1180 for (i = 0; i < MAX_MGMT_OUI; i++) {
1181 /* Is there matching OUI for this vendor class ? */
1182 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1183 mad_reg_req->oui, 3)) {
1184 method = &(*vendor_table)->vendor_class[
1185 vclass]->method_table[i];
1190 for (i = 0; i < MAX_MGMT_OUI; i++) {
1191 /* OUI slot available ? */
1192 if (!is_vendor_oui((*vendor_table)->vendor_class[
1194 method = &(*vendor_table)->vendor_class[
1195 vclass]->method_table[i];
1197 /* Allocate method table for this OUI */
1198 if ((ret = allocate_method_table(method)))
1200 memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1201 mad_reg_req->oui, 3);
1205 printk(KERN_ERR PFX "All OUI slots in use\n");
1209 /* Now, make sure methods are not already in use */
1210 if (method_in_use(method, mad_reg_req))
1213 /* Finally, add in methods being registered */
1214 for (i = find_first_bit(mad_reg_req->method_mask,
1215 IB_MGMT_MAX_METHODS);
1216 i < IB_MGMT_MAX_METHODS;
1217 i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1219 (*method)->agent[i] = agent_priv;
1224 /* Remove any methods for this mad agent */
1225 remove_methods_mad_agent(*method, agent_priv);
1226 /* Now, check to see if there are any methods in use */
1227 if (!check_method_table(*method)) {
1228 /* If not, release management method table */
1235 (*vendor_table)->vendor_class[vclass] = NULL;
1236 kfree(vendor_class);
1240 *vendor_table = NULL;
1247 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1249 struct ib_mad_port_private *port_priv;
1250 struct ib_mad_mgmt_class_table *class;
1251 struct ib_mad_mgmt_method_table *method;
1252 struct ib_mad_mgmt_vendor_class_table *vendor;
1253 struct ib_mad_mgmt_vendor_class *vendor_class;
1258 * Was MAD registration request supplied
1259 * with original registration ?
1261 if (!agent_priv->reg_req) {
1265 port_priv = agent_priv->qp_info->port_priv;
1266 mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1267 class = port_priv->version[
1268 agent_priv->reg_req->mgmt_class_version].class;
1272 method = class->method_table[mgmt_class];
1274 /* Remove any methods for this mad agent */
1275 remove_methods_mad_agent(method, agent_priv);
1276 /* Now, check to see if there are any methods still in use */
1277 if (!check_method_table(method)) {
1278 /* If not, release management method table */
1280 class->method_table[mgmt_class] = NULL;
1281 /* Any management classes left ? */
1282 if (!check_class_table(class)) {
1283 /* If not, release management class table */
1286 agent_priv->reg_req->
1287 mgmt_class_version].class = NULL;
1293 if (!is_vendor_class(mgmt_class))
1296 /* normalize mgmt_class to vendor range 2 */
1297 mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1298 vendor = port_priv->version[
1299 agent_priv->reg_req->mgmt_class_version].vendor;
1304 vendor_class = vendor->vendor_class[mgmt_class];
1306 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1309 method = vendor_class->method_table[index];
1311 /* Remove any methods for this mad agent */
1312 remove_methods_mad_agent(method, agent_priv);
1314 * Now, check to see if there are
1315 * any methods still in use
1317 if (!check_method_table(method)) {
1318 /* If not, release management method table */
1320 vendor_class->method_table[index] = NULL;
1321 memset(vendor_class->oui[index], 0, 3);
1322 /* Any OUIs left ? */
1323 if (!check_vendor_class(vendor_class)) {
1324 /* If not, release vendor class table */
1325 kfree(vendor_class);
1326 vendor->vendor_class[mgmt_class] = NULL;
1327 /* Any other vendor classes left ? */
1328 if (!check_vendor_table(vendor)) {
1331 agent_priv->reg_req->
1332 mgmt_class_version].
1344 static int response_mad(struct ib_mad *mad)
1346 /* Trap represses are responses although response bit is reset */
1347 return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
1348 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
1351 static int solicited_mad(struct ib_mad *mad)
1353 /* CM MADs are never solicited */
1354 if (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CM) {
1358 /* XXX: Determine whether MAD is using RMPP */
1360 /* Not using RMPP */
1361 /* Is this MAD a response to a previous MAD ? */
1362 return response_mad(mad);
1365 static struct ib_mad_agent_private *
1366 find_mad_agent(struct ib_mad_port_private *port_priv,
1370 struct ib_mad_agent_private *mad_agent = NULL;
1371 unsigned long flags;
1373 spin_lock_irqsave(&port_priv->reg_lock, flags);
1376 * Whether MAD was solicited determines type of routing to
1381 struct ib_mad_agent_private *entry;
1384 * Routing is based on high 32 bits of transaction ID
1387 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1388 list_for_each_entry(entry, &port_priv->agent_list,
1390 if (entry->agent.hi_tid == hi_tid) {
1396 struct ib_mad_mgmt_class_table *class;
1397 struct ib_mad_mgmt_method_table *method;
1398 struct ib_mad_mgmt_vendor_class_table *vendor;
1399 struct ib_mad_mgmt_vendor_class *vendor_class;
1400 struct ib_vendor_mad *vendor_mad;
1404 * Routing is based on version, class, and method
1405 * For "newer" vendor MADs, also based on OUI
1407 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1409 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1410 class = port_priv->version[
1411 mad->mad_hdr.class_version].class;
1414 method = class->method_table[convert_mgmt_class(
1415 mad->mad_hdr.mgmt_class)];
1417 mad_agent = method->agent[mad->mad_hdr.method &
1418 ~IB_MGMT_METHOD_RESP];
1420 vendor = port_priv->version[
1421 mad->mad_hdr.class_version].vendor;
1424 vendor_class = vendor->vendor_class[vendor_class_index(
1425 mad->mad_hdr.mgmt_class)];
1428 /* Find matching OUI */
1429 vendor_mad = (struct ib_vendor_mad *)mad;
1430 index = find_vendor_oui(vendor_class, vendor_mad->oui);
1433 method = vendor_class->method_table[index];
1435 mad_agent = method->agent[mad->mad_hdr.method &
1436 ~IB_MGMT_METHOD_RESP];
1442 if (mad_agent->agent.recv_handler)
1443 atomic_inc(&mad_agent->refcount);
1445 printk(KERN_NOTICE PFX "No receive handler for client "
1447 &mad_agent->agent, port_priv->port_num);
1452 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1457 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1461 /* Make sure MAD base version is understood */
1462 if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1463 printk(KERN_ERR PFX "MAD received with unsupported base "
1464 "version %d\n", mad->mad_hdr.base_version);
1468 /* Filter SMI packets sent to other than QP0 */
1469 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1470 (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1474 /* Filter GSI packets sent to QP0 */
1484 * Return start of fully reassembled MAD, or NULL, if MAD isn't assembled yet
1486 static struct ib_mad_private *
1487 reassemble_recv(struct ib_mad_agent_private *mad_agent_priv,
1488 struct ib_mad_private *recv)
1490 /* Until we have RMPP, all receives are reassembled!... */
1491 INIT_LIST_HEAD(&recv->header.recv_wc.recv_buf.list);
1495 static struct ib_mad_send_wr_private*
1496 find_send_req(struct ib_mad_agent_private *mad_agent_priv,
1499 struct ib_mad_send_wr_private *mad_send_wr;
1501 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1503 if (mad_send_wr->tid == tid)
1508 * It's possible to receive the response before we've
1509 * been notified that the send has completed
1511 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1513 if (mad_send_wr->tid == tid && mad_send_wr->timeout) {
1514 /* Verify request has not been canceled */
1515 return (mad_send_wr->status == IB_WC_SUCCESS) ?
1522 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1523 struct ib_mad_private *recv,
1526 struct ib_mad_send_wr_private *mad_send_wr;
1527 struct ib_mad_send_wc mad_send_wc;
1528 unsigned long flags;
1530 /* Fully reassemble receive before processing */
1531 recv = reassemble_recv(mad_agent_priv, recv);
1533 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1534 wake_up(&mad_agent_priv->wait);
1538 /* Complete corresponding request */
1540 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1541 mad_send_wr = find_send_req(mad_agent_priv,
1542 recv->mad.mad.mad_hdr.tid);
1544 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1545 ib_free_recv_mad(&recv->header.recv_wc);
1546 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1547 wake_up(&mad_agent_priv->wait);
1550 /* Timeout = 0 means that we won't wait for a response */
1551 mad_send_wr->timeout = 0;
1552 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1554 /* Defined behavior is to complete response before request */
1555 recv->header.recv_wc.wc->wr_id = mad_send_wr->wr_id;
1556 mad_agent_priv->agent.recv_handler(
1557 &mad_agent_priv->agent,
1558 &recv->header.recv_wc);
1559 atomic_dec(&mad_agent_priv->refcount);
1561 mad_send_wc.status = IB_WC_SUCCESS;
1562 mad_send_wc.vendor_err = 0;
1563 mad_send_wc.wr_id = mad_send_wr->wr_id;
1564 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1566 mad_agent_priv->agent.recv_handler(
1567 &mad_agent_priv->agent,
1568 &recv->header.recv_wc);
1569 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1570 wake_up(&mad_agent_priv->wait);
1574 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1577 struct ib_mad_qp_info *qp_info;
1578 struct ib_mad_private_header *mad_priv_hdr;
1579 struct ib_mad_private *recv, *response;
1580 struct ib_mad_list_head *mad_list;
1581 struct ib_mad_agent_private *mad_agent;
1584 response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1586 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1587 "for response buffer\n");
1589 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1590 qp_info = mad_list->mad_queue->qp_info;
1591 dequeue_mad(mad_list);
1593 mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1595 recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1596 dma_unmap_single(port_priv->device->dma_device,
1597 pci_unmap_addr(&recv->header, mapping),
1598 sizeof(struct ib_mad_private) -
1599 sizeof(struct ib_mad_private_header),
1602 /* Setup MAD receive work completion from "normal" work completion */
1603 recv->header.recv_wc.wc = wc;
1604 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1605 recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1606 recv->header.recv_wc.recv_buf.grh = &recv->grh;
1608 if (atomic_read(&qp_info->snoop_count))
1609 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1612 if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1615 if (recv->mad.mad.mad_hdr.mgmt_class ==
1616 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1617 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1618 port_priv->device->node_type,
1619 port_priv->port_num,
1620 port_priv->device->phys_port_cnt))
1622 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1624 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1625 port_priv->device->node_type,
1626 port_priv->port_num))
1628 if (!smi_check_local_dr_smp(&recv->mad.smp,
1630 port_priv->port_num))
1635 /* Give driver "right of first refusal" on incoming MAD */
1636 if (port_priv->device->process_mad) {
1640 printk(KERN_ERR PFX "No memory for response MAD\n");
1642 * Is it better to assume that
1643 * it wouldn't be processed ?
1648 ret = port_priv->device->process_mad(port_priv->device, 0,
1649 port_priv->port_num,
1652 &response->mad.mad);
1653 if (ret & IB_MAD_RESULT_SUCCESS) {
1654 if (ret & IB_MAD_RESULT_CONSUMED)
1656 if (ret & IB_MAD_RESULT_REPLY) {
1658 if (!agent_send(response, &recv->grh, wc,
1660 port_priv->port_num))
1667 /* Determine corresponding MAD agent for incoming receive MAD */
1668 solicited = solicited_mad(&recv->mad.mad);
1669 mad_agent = find_mad_agent(port_priv, &recv->mad.mad, solicited);
1671 ib_mad_complete_recv(mad_agent, recv, solicited);
1673 * recv is freed up in error cases in ib_mad_complete_recv
1674 * or via recv_handler in ib_mad_complete_recv()
1680 /* Post another receive request for this QP */
1682 ib_mad_post_receive_mads(qp_info, response);
1684 kmem_cache_free(ib_mad_cache, recv);
1686 ib_mad_post_receive_mads(qp_info, recv);
1689 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1691 struct ib_mad_send_wr_private *mad_send_wr;
1692 unsigned long delay;
1694 if (list_empty(&mad_agent_priv->wait_list)) {
1695 cancel_delayed_work(&mad_agent_priv->timed_work);
1697 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1698 struct ib_mad_send_wr_private,
1701 if (time_after(mad_agent_priv->timeout,
1702 mad_send_wr->timeout)) {
1703 mad_agent_priv->timeout = mad_send_wr->timeout;
1704 cancel_delayed_work(&mad_agent_priv->timed_work);
1705 delay = mad_send_wr->timeout - jiffies;
1706 if ((long)delay <= 0)
1708 queue_delayed_work(mad_agent_priv->qp_info->
1710 &mad_agent_priv->timed_work, delay);
1715 static void wait_for_response(struct ib_mad_agent_private *mad_agent_priv,
1716 struct ib_mad_send_wr_private *mad_send_wr )
1718 struct ib_mad_send_wr_private *temp_mad_send_wr;
1719 struct list_head *list_item;
1720 unsigned long delay;
1722 list_del(&mad_send_wr->agent_list);
1724 delay = mad_send_wr->timeout;
1725 mad_send_wr->timeout += jiffies;
1727 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1728 temp_mad_send_wr = list_entry(list_item,
1729 struct ib_mad_send_wr_private,
1731 if (time_after(mad_send_wr->timeout,
1732 temp_mad_send_wr->timeout))
1735 list_add(&mad_send_wr->agent_list, list_item);
1737 /* Reschedule a work item if we have a shorter timeout */
1738 if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1739 cancel_delayed_work(&mad_agent_priv->timed_work);
1740 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1741 &mad_agent_priv->timed_work, delay);
1746 * Process a send work completion
1748 static void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1749 struct ib_mad_send_wc *mad_send_wc)
1751 struct ib_mad_agent_private *mad_agent_priv;
1752 unsigned long flags;
1754 mad_agent_priv = container_of(mad_send_wr->agent,
1755 struct ib_mad_agent_private, agent);
1757 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1758 if (mad_send_wc->status != IB_WC_SUCCESS &&
1759 mad_send_wr->status == IB_WC_SUCCESS) {
1760 mad_send_wr->status = mad_send_wc->status;
1761 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1764 if (--mad_send_wr->refcount > 0) {
1765 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1766 mad_send_wr->status == IB_WC_SUCCESS) {
1767 wait_for_response(mad_agent_priv, mad_send_wr);
1769 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1773 /* Remove send from MAD agent and notify client of completion */
1774 list_del(&mad_send_wr->agent_list);
1775 adjust_timeout(mad_agent_priv);
1776 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1778 if (mad_send_wr->status != IB_WC_SUCCESS )
1779 mad_send_wc->status = mad_send_wr->status;
1780 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1783 /* Release reference on agent taken when sending */
1784 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1785 wake_up(&mad_agent_priv->wait);
1790 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1793 struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
1794 struct ib_mad_list_head *mad_list;
1795 struct ib_mad_qp_info *qp_info;
1796 struct ib_mad_queue *send_queue;
1797 struct ib_send_wr *bad_send_wr;
1798 unsigned long flags;
1801 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1802 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1804 send_queue = mad_list->mad_queue;
1805 qp_info = send_queue->qp_info;
1808 queued_send_wr = NULL;
1809 spin_lock_irqsave(&send_queue->lock, flags);
1810 list_del(&mad_list->list);
1812 /* Move queued send to the send queue */
1813 if (send_queue->count-- > send_queue->max_active) {
1814 mad_list = container_of(qp_info->overflow_list.next,
1815 struct ib_mad_list_head, list);
1816 queued_send_wr = container_of(mad_list,
1817 struct ib_mad_send_wr_private,
1819 list_del(&mad_list->list);
1820 list_add_tail(&mad_list->list, &send_queue->list);
1822 spin_unlock_irqrestore(&send_queue->lock, flags);
1824 /* Restore client wr_id in WC and complete send */
1825 wc->wr_id = mad_send_wr->wr_id;
1826 if (atomic_read(&qp_info->snoop_count))
1827 snoop_send(qp_info, &mad_send_wr->send_wr,
1828 (struct ib_mad_send_wc *)wc,
1829 IB_MAD_SNOOP_SEND_COMPLETIONS);
1830 ib_mad_complete_send_wr(mad_send_wr, (struct ib_mad_send_wc *)wc);
1832 if (queued_send_wr) {
1833 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1836 printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1837 mad_send_wr = queued_send_wr;
1838 wc->status = IB_WC_LOC_QP_OP_ERR;
1844 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1846 struct ib_mad_send_wr_private *mad_send_wr;
1847 struct ib_mad_list_head *mad_list;
1848 unsigned long flags;
1850 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1851 list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1852 mad_send_wr = container_of(mad_list,
1853 struct ib_mad_send_wr_private,
1855 mad_send_wr->retry = 1;
1857 spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1860 static void mad_error_handler(struct ib_mad_port_private *port_priv,
1863 struct ib_mad_list_head *mad_list;
1864 struct ib_mad_qp_info *qp_info;
1865 struct ib_mad_send_wr_private *mad_send_wr;
1868 /* Determine if failure was a send or receive */
1869 mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1870 qp_info = mad_list->mad_queue->qp_info;
1871 if (mad_list->mad_queue == &qp_info->recv_queue)
1873 * Receive errors indicate that the QP has entered the error
1874 * state - error handling/shutdown code will cleanup
1879 * Send errors will transition the QP to SQE - move
1880 * QP to RTS and repost flushed work requests
1882 mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1884 if (wc->status == IB_WC_WR_FLUSH_ERR) {
1885 if (mad_send_wr->retry) {
1887 struct ib_send_wr *bad_send_wr;
1889 mad_send_wr->retry = 0;
1890 ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1893 ib_mad_send_done_handler(port_priv, wc);
1895 ib_mad_send_done_handler(port_priv, wc);
1897 struct ib_qp_attr *attr;
1899 /* Transition QP to RTS and fail offending send */
1900 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1902 attr->qp_state = IB_QPS_RTS;
1903 attr->cur_qp_state = IB_QPS_SQE;
1904 ret = ib_modify_qp(qp_info->qp, attr,
1905 IB_QP_STATE | IB_QP_CUR_STATE);
1908 printk(KERN_ERR PFX "mad_error_handler - "
1909 "ib_modify_qp to RTS : %d\n", ret);
1911 mark_sends_for_retry(qp_info);
1913 ib_mad_send_done_handler(port_priv, wc);
1918 * IB MAD completion callback
1920 static void ib_mad_completion_handler(void *data)
1922 struct ib_mad_port_private *port_priv;
1925 port_priv = (struct ib_mad_port_private *)data;
1926 ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
1928 while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
1929 if (wc.status == IB_WC_SUCCESS) {
1930 switch (wc.opcode) {
1932 ib_mad_send_done_handler(port_priv, &wc);
1935 ib_mad_recv_done_handler(port_priv, &wc);
1942 mad_error_handler(port_priv, &wc);
1946 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
1948 unsigned long flags;
1949 struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
1950 struct ib_mad_send_wc mad_send_wc;
1951 struct list_head cancel_list;
1953 INIT_LIST_HEAD(&cancel_list);
1955 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1956 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
1957 &mad_agent_priv->send_list, agent_list) {
1958 if (mad_send_wr->status == IB_WC_SUCCESS) {
1959 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
1960 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1964 /* Empty wait list to prevent receives from finding a request */
1965 list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
1966 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1968 /* Report all cancelled requests */
1969 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
1970 mad_send_wc.vendor_err = 0;
1972 list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
1973 &cancel_list, agent_list) {
1974 mad_send_wc.wr_id = mad_send_wr->wr_id;
1975 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1978 list_del(&mad_send_wr->agent_list);
1980 atomic_dec(&mad_agent_priv->refcount);
1984 static struct ib_mad_send_wr_private*
1985 find_send_by_wr_id(struct ib_mad_agent_private *mad_agent_priv,
1988 struct ib_mad_send_wr_private *mad_send_wr;
1990 list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1992 if (mad_send_wr->wr_id == wr_id)
1996 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1998 if (mad_send_wr->wr_id == wr_id)
2004 void cancel_sends(void *data)
2006 struct ib_mad_agent_private *mad_agent_priv;
2007 struct ib_mad_send_wr_private *mad_send_wr;
2008 struct ib_mad_send_wc mad_send_wc;
2009 unsigned long flags;
2011 mad_agent_priv = data;
2013 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2014 mad_send_wc.vendor_err = 0;
2016 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2017 while (!list_empty(&mad_agent_priv->canceled_list)) {
2018 mad_send_wr = list_entry(mad_agent_priv->canceled_list.next,
2019 struct ib_mad_send_wr_private,
2022 list_del(&mad_send_wr->agent_list);
2023 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2025 mad_send_wc.wr_id = mad_send_wr->wr_id;
2026 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2030 if (atomic_dec_and_test(&mad_agent_priv->refcount))
2031 wake_up(&mad_agent_priv->wait);
2032 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2034 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2037 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2040 struct ib_mad_agent_private *mad_agent_priv;
2041 struct ib_mad_send_wr_private *mad_send_wr;
2042 unsigned long flags;
2044 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2046 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2047 mad_send_wr = find_send_by_wr_id(mad_agent_priv, wr_id);
2049 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2053 if (mad_send_wr->status == IB_WC_SUCCESS)
2054 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2056 if (mad_send_wr->refcount != 0) {
2057 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2058 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2062 list_del(&mad_send_wr->agent_list);
2063 list_add_tail(&mad_send_wr->agent_list, &mad_agent_priv->canceled_list);
2064 adjust_timeout(mad_agent_priv);
2065 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2067 queue_work(mad_agent_priv->qp_info->port_priv->wq,
2068 &mad_agent_priv->canceled_work);
2072 EXPORT_SYMBOL(ib_cancel_mad);
2074 static void local_completions(void *data)
2076 struct ib_mad_agent_private *mad_agent_priv;
2077 struct ib_mad_local_private *local;
2078 struct ib_mad_agent_private *recv_mad_agent;
2079 unsigned long flags;
2081 struct ib_mad_send_wc mad_send_wc;
2083 mad_agent_priv = (struct ib_mad_agent_private *)data;
2085 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2086 while (!list_empty(&mad_agent_priv->local_list)) {
2087 local = list_entry(mad_agent_priv->local_list.next,
2088 struct ib_mad_local_private,
2090 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2091 if (local->mad_priv) {
2092 recv_mad_agent = local->recv_mad_agent;
2093 if (!recv_mad_agent) {
2094 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2095 kmem_cache_free(ib_mad_cache, local->mad_priv);
2096 goto local_send_completion;
2100 * Defined behavior is to complete response
2103 build_smp_wc(local->wr_id, IB_LID_PERMISSIVE,
2105 recv_mad_agent->agent.port_num, &wc);
2107 local->mad_priv->header.recv_wc.wc = &wc;
2108 local->mad_priv->header.recv_wc.mad_len =
2109 sizeof(struct ib_mad);
2110 INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.recv_buf.list);
2111 local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2112 local->mad_priv->header.recv_wc.recv_buf.mad =
2113 &local->mad_priv->mad.mad;
2114 if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2115 snoop_recv(recv_mad_agent->qp_info,
2116 &local->mad_priv->header.recv_wc,
2117 IB_MAD_SNOOP_RECVS);
2118 recv_mad_agent->agent.recv_handler(
2119 &recv_mad_agent->agent,
2120 &local->mad_priv->header.recv_wc);
2121 spin_lock_irqsave(&recv_mad_agent->lock, flags);
2122 atomic_dec(&recv_mad_agent->refcount);
2123 spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2126 local_send_completion:
2128 mad_send_wc.status = IB_WC_SUCCESS;
2129 mad_send_wc.vendor_err = 0;
2130 mad_send_wc.wr_id = local->wr_id;
2131 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2132 snoop_send(mad_agent_priv->qp_info, &local->send_wr,
2134 IB_MAD_SNOOP_SEND_COMPLETIONS);
2135 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2138 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2139 list_del(&local->completion_list);
2140 atomic_dec(&mad_agent_priv->refcount);
2143 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2146 static void timeout_sends(void *data)
2148 struct ib_mad_agent_private *mad_agent_priv;
2149 struct ib_mad_send_wr_private *mad_send_wr;
2150 struct ib_mad_send_wc mad_send_wc;
2151 unsigned long flags, delay;
2153 mad_agent_priv = (struct ib_mad_agent_private *)data;
2155 mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2156 mad_send_wc.vendor_err = 0;
2158 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2159 while (!list_empty(&mad_agent_priv->wait_list)) {
2160 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2161 struct ib_mad_send_wr_private,
2164 if (time_after(mad_send_wr->timeout, jiffies)) {
2165 delay = mad_send_wr->timeout - jiffies;
2166 if ((long)delay <= 0)
2168 queue_delayed_work(mad_agent_priv->qp_info->
2170 &mad_agent_priv->timed_work, delay);
2174 list_del(&mad_send_wr->agent_list);
2175 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2177 mad_send_wc.wr_id = mad_send_wr->wr_id;
2178 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2182 atomic_dec(&mad_agent_priv->refcount);
2183 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2185 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2188 static void ib_mad_thread_completion_handler(struct ib_cq *cq)
2190 struct ib_mad_port_private *port_priv = cq->cq_context;
2192 queue_work(port_priv->wq, &port_priv->work);
2196 * Allocate receive MADs and post receive WRs for them
2198 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2199 struct ib_mad_private *mad)
2201 unsigned long flags;
2203 struct ib_mad_private *mad_priv;
2204 struct ib_sge sg_list;
2205 struct ib_recv_wr recv_wr, *bad_recv_wr;
2206 struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2208 /* Initialize common scatter list fields */
2209 sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2210 sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2212 /* Initialize common receive WR fields */
2213 recv_wr.next = NULL;
2214 recv_wr.sg_list = &sg_list;
2215 recv_wr.num_sge = 1;
2218 /* Allocate and map receive buffer */
2223 mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2225 printk(KERN_ERR PFX "No memory for receive buffer\n");
2230 sg_list.addr = dma_map_single(qp_info->port_priv->
2234 sizeof mad_priv->header,
2236 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2237 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2238 mad_priv->header.mad_list.mad_queue = recv_queue;
2240 /* Post receive WR */
2241 spin_lock_irqsave(&recv_queue->lock, flags);
2242 post = (++recv_queue->count < recv_queue->max_active);
2243 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2244 spin_unlock_irqrestore(&recv_queue->lock, flags);
2245 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2247 spin_lock_irqsave(&recv_queue->lock, flags);
2248 list_del(&mad_priv->header.mad_list.list);
2249 recv_queue->count--;
2250 spin_unlock_irqrestore(&recv_queue->lock, flags);
2251 dma_unmap_single(qp_info->port_priv->device->dma_device,
2252 pci_unmap_addr(&mad_priv->header,
2255 sizeof mad_priv->header,
2257 kmem_cache_free(ib_mad_cache, mad_priv);
2258 printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2267 * Return all the posted receive MADs
2269 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2271 struct ib_mad_private_header *mad_priv_hdr;
2272 struct ib_mad_private *recv;
2273 struct ib_mad_list_head *mad_list;
2275 while (!list_empty(&qp_info->recv_queue.list)) {
2277 mad_list = list_entry(qp_info->recv_queue.list.next,
2278 struct ib_mad_list_head, list);
2279 mad_priv_hdr = container_of(mad_list,
2280 struct ib_mad_private_header,
2282 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2285 /* Remove from posted receive MAD list */
2286 list_del(&mad_list->list);
2288 /* Undo PCI mapping */
2289 dma_unmap_single(qp_info->port_priv->device->dma_device,
2290 pci_unmap_addr(&recv->header, mapping),
2291 sizeof(struct ib_mad_private) -
2292 sizeof(struct ib_mad_private_header),
2294 kmem_cache_free(ib_mad_cache, recv);
2297 qp_info->recv_queue.count = 0;
2303 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2306 struct ib_qp_attr *attr;
2309 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2311 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2315 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2316 qp = port_priv->qp_info[i].qp;
2318 * PKey index for QP1 is irrelevant but
2319 * one is needed for the Reset to Init transition
2321 attr->qp_state = IB_QPS_INIT;
2322 attr->pkey_index = 0;
2323 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2324 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2325 IB_QP_PKEY_INDEX | IB_QP_QKEY);
2327 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2328 "INIT: %d\n", i, ret);
2332 attr->qp_state = IB_QPS_RTR;
2333 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2335 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2336 "RTR: %d\n", i, ret);
2340 attr->qp_state = IB_QPS_RTS;
2341 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2342 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2344 printk(KERN_ERR PFX "Couldn't change QP%d state to "
2345 "RTS: %d\n", i, ret);
2350 ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2352 printk(KERN_ERR PFX "Failed to request completion "
2353 "notification: %d\n", ret);
2357 for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2358 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2360 printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2369 static void qp_event_handler(struct ib_event *event, void *qp_context)
2371 struct ib_mad_qp_info *qp_info = qp_context;
2373 /* It's worse than that! He's dead, Jim! */
2374 printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2375 event->event, qp_info->qp->qp_num);
2378 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2379 struct ib_mad_queue *mad_queue)
2381 mad_queue->qp_info = qp_info;
2382 mad_queue->count = 0;
2383 spin_lock_init(&mad_queue->lock);
2384 INIT_LIST_HEAD(&mad_queue->list);
2387 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2388 struct ib_mad_qp_info *qp_info)
2390 qp_info->port_priv = port_priv;
2391 init_mad_queue(qp_info, &qp_info->send_queue);
2392 init_mad_queue(qp_info, &qp_info->recv_queue);
2393 INIT_LIST_HEAD(&qp_info->overflow_list);
2394 spin_lock_init(&qp_info->snoop_lock);
2395 qp_info->snoop_table = NULL;
2396 qp_info->snoop_table_size = 0;
2397 atomic_set(&qp_info->snoop_count, 0);
2400 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2401 enum ib_qp_type qp_type)
2403 struct ib_qp_init_attr qp_init_attr;
2406 memset(&qp_init_attr, 0, sizeof qp_init_attr);
2407 qp_init_attr.send_cq = qp_info->port_priv->cq;
2408 qp_init_attr.recv_cq = qp_info->port_priv->cq;
2409 qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2410 qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2411 qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2412 qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2413 qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2414 qp_init_attr.qp_type = qp_type;
2415 qp_init_attr.port_num = qp_info->port_priv->port_num;
2416 qp_init_attr.qp_context = qp_info;
2417 qp_init_attr.event_handler = qp_event_handler;
2418 qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2419 if (IS_ERR(qp_info->qp)) {
2420 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2421 get_spl_qp_index(qp_type));
2422 ret = PTR_ERR(qp_info->qp);
2425 /* Use minimum queue sizes unless the CQ is resized */
2426 qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2427 qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2434 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2436 ib_destroy_qp(qp_info->qp);
2437 if (qp_info->snoop_table)
2438 kfree(qp_info->snoop_table);
2443 * Create the QP, PD, MR, and CQ if needed
2445 static int ib_mad_port_open(struct ib_device *device,
2449 struct ib_mad_port_private *port_priv;
2450 unsigned long flags;
2451 char name[sizeof "ib_mad123"];
2453 /* First, check if port already open at MAD layer */
2454 port_priv = ib_get_mad_port(device, port_num);
2456 printk(KERN_DEBUG PFX "%s port %d already open\n",
2457 device->name, port_num);
2461 /* Create new device info */
2462 port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
2464 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2467 memset(port_priv, 0, sizeof *port_priv);
2468 port_priv->device = device;
2469 port_priv->port_num = port_num;
2470 spin_lock_init(&port_priv->reg_lock);
2471 INIT_LIST_HEAD(&port_priv->agent_list);
2472 init_mad_qp(port_priv, &port_priv->qp_info[0]);
2473 init_mad_qp(port_priv, &port_priv->qp_info[1]);
2475 cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2476 port_priv->cq = ib_create_cq(port_priv->device,
2478 ib_mad_thread_completion_handler,
2479 NULL, port_priv, cq_size);
2480 if (IS_ERR(port_priv->cq)) {
2481 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2482 ret = PTR_ERR(port_priv->cq);
2486 port_priv->pd = ib_alloc_pd(device);
2487 if (IS_ERR(port_priv->pd)) {
2488 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2489 ret = PTR_ERR(port_priv->pd);
2493 port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2494 if (IS_ERR(port_priv->mr)) {
2495 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2496 ret = PTR_ERR(port_priv->mr);
2500 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2503 ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2507 snprintf(name, sizeof name, "ib_mad%d", port_num);
2508 port_priv->wq = create_singlethread_workqueue(name);
2509 if (!port_priv->wq) {
2513 INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2515 ret = ib_mad_port_start(port_priv);
2517 printk(KERN_ERR PFX "Couldn't start port\n");
2521 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2522 list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2523 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2527 destroy_workqueue(port_priv->wq);
2529 destroy_mad_qp(&port_priv->qp_info[1]);
2531 destroy_mad_qp(&port_priv->qp_info[0]);
2533 ib_dereg_mr(port_priv->mr);
2535 ib_dealloc_pd(port_priv->pd);
2537 ib_destroy_cq(port_priv->cq);
2538 cleanup_recv_queue(&port_priv->qp_info[1]);
2539 cleanup_recv_queue(&port_priv->qp_info[0]);
2548 * If there are no classes using the port, free the port
2549 * resources (CQ, MR, PD, QP) and remove the port's info structure
2551 static int ib_mad_port_close(struct ib_device *device, int port_num)
2553 struct ib_mad_port_private *port_priv;
2554 unsigned long flags;
2556 spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2557 port_priv = __ib_get_mad_port(device, port_num);
2558 if (port_priv == NULL) {
2559 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2560 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2563 list_del(&port_priv->port_list);
2564 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2566 /* Stop processing completions. */
2567 flush_workqueue(port_priv->wq);
2568 destroy_workqueue(port_priv->wq);
2569 destroy_mad_qp(&port_priv->qp_info[1]);
2570 destroy_mad_qp(&port_priv->qp_info[0]);
2571 ib_dereg_mr(port_priv->mr);
2572 ib_dealloc_pd(port_priv->pd);
2573 ib_destroy_cq(port_priv->cq);
2574 cleanup_recv_queue(&port_priv->qp_info[1]);
2575 cleanup_recv_queue(&port_priv->qp_info[0]);
2576 /* XXX: Handle deallocation of MAD registration tables */
2583 static void ib_mad_init_device(struct ib_device *device)
2585 int ret, num_ports, cur_port, i, ret2;
2587 if (device->node_type == IB_NODE_SWITCH) {
2591 num_ports = device->phys_port_cnt;
2594 for (i = 0; i < num_ports; i++, cur_port++) {
2595 ret = ib_mad_port_open(device, cur_port);
2597 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2598 device->name, cur_port);
2599 goto error_device_open;
2601 ret = ib_agent_port_open(device, cur_port);
2603 printk(KERN_ERR PFX "Couldn't open %s port %d "
2605 device->name, cur_port);
2606 goto error_device_open;
2610 goto error_device_query;
2615 ret2 = ib_agent_port_close(device, cur_port);
2617 printk(KERN_ERR PFX "Couldn't close %s port %d "
2619 device->name, cur_port);
2621 ret2 = ib_mad_port_close(device, cur_port);
2623 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2624 device->name, cur_port);
2633 static void ib_mad_remove_device(struct ib_device *device)
2635 int ret = 0, i, num_ports, cur_port, ret2;
2637 if (device->node_type == IB_NODE_SWITCH) {
2641 num_ports = device->phys_port_cnt;
2644 for (i = 0; i < num_ports; i++, cur_port++) {
2645 ret2 = ib_agent_port_close(device, cur_port);
2647 printk(KERN_ERR PFX "Couldn't close %s port %d "
2649 device->name, cur_port);
2653 ret2 = ib_mad_port_close(device, cur_port);
2655 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2656 device->name, cur_port);
2663 static struct ib_client mad_client = {
2665 .add = ib_mad_init_device,
2666 .remove = ib_mad_remove_device
2669 static int __init ib_mad_init_module(void)
2673 spin_lock_init(&ib_mad_port_list_lock);
2674 spin_lock_init(&ib_agent_port_list_lock);
2676 ib_mad_cache = kmem_cache_create("ib_mad",
2677 sizeof(struct ib_mad_private),
2682 if (!ib_mad_cache) {
2683 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2688 INIT_LIST_HEAD(&ib_mad_port_list);
2690 if (ib_register_client(&mad_client)) {
2691 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2699 kmem_cache_destroy(ib_mad_cache);
2704 static void __exit ib_mad_cleanup_module(void)
2706 ib_unregister_client(&mad_client);
2708 if (kmem_cache_destroy(ib_mad_cache)) {
2709 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2713 module_init(ib_mad_init_module);
2714 module_exit(ib_mad_cleanup_module);