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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Hal Rosenstockde493d42007-04-02 11:24:07 -04002 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
Hal Rosenstockfa619a72005-07-27 11:45:37 -07003 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
Hal Rosenstockb76aabc2009-09-07 08:28:48 -07005 * Copyright (c) 2009 HNR Consulting. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/dma-mapping.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Paul Gortmakere4dd23d2011-05-27 15:35:46 -040038#include <linux/module.h>
Jack Morgenstein9874e742006-06-17 20:37:34 -070039#include <rdma/ib_cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include "mad_priv.h"
Hal Rosenstockfa619a72005-07-27 11:45:37 -070042#include "mad_rmpp.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#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
Roland Dreier16933952010-05-23 21:39:31 -070051static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
52static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
Hal Rosenstockb76aabc2009-09-07 08:28:48 -070053
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
Roland Dreiere54f8182006-11-29 15:33:07 -080059static struct kmem_cache *ib_mad_cache;
Hal Rosenstockfa619a72005-07-27 11:45:37 -070060
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static struct list_head ib_mad_port_list;
62static u32 ib_mad_client_id = 0;
63
64/* Port list lock */
Roland Dreier6276e082009-09-05 20:24:23 -070065static DEFINE_SPINLOCK(ib_mad_port_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
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,
Hal Rosenstock4a0754f2005-07-27 11:45:24 -070073 struct ib_mad *mad);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static 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);
David Howellsc4028952006-11-22 14:57:56 +000077static void timeout_sends(struct work_struct *work);
78static void local_completions(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static 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
Sean Hefty2527e682006-07-20 11:25:50 +0300179int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188/*
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
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700217 if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
218 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
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 }
Hal Rosenstock618a3c02006-03-28 16:40:04 -0800248 /* Make sure class supplied is consistent with RMPP */
Hal Rosenstock64cb9c62006-04-12 21:29:10 -0400249 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
Hal Rosenstock618a3c02006-03-28 16:40:04 -0800250 if (rmpp_version)
251 goto error1;
252 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 /* 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
Ira Weinyc8367c42011-05-19 18:19:28 -0700280 /* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 /* Allocate structures */
Roland Dreierde6eb662005-11-02 07:23:14 -0800288 mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if (!mad_agent_priv) {
290 ret = ERR_PTR(-ENOMEM);
291 goto error1;
292 }
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700293
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 if (mad_reg_req) {
Julia Lawall9893e742010-05-15 23:22:38 +0200302 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 if (!reg_req) {
304 ret = ERR_PTR(-ENOMEM);
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700305 goto error3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 }
308
309 /* Now, fill in the various structures */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
311 mad_agent_priv->reg_req = reg_req;
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700312 mad_agent_priv->agent.rmpp_version = rmpp_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 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;
Ralph Campbelld9620a42009-02-27 14:44:32 -0800319 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
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))
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700347 goto error4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
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))
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700363 goto error4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365 }
366 ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
367 }
368 if (ret2) {
369 ret = ERR_PTR(ret2);
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700370 goto error4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return &mad_agent_priv->agent;
379
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700380error4:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
382 kfree(reg_req);
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700383error3:
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700384 ib_dereg_mr(mad_agent_priv->agent.mr);
Adrian Bunk2012a112005-11-27 00:37:36 +0100385error2:
386 kfree(mad_agent_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387error1:
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. */
Roland Dreier528051742008-10-14 14:05:36 -0700423 new_snoop_table = krealloc(qp_info->snoop_table,
424 sizeof mad_snoop_priv *
425 (qp_info->snoop_table_size + 1),
426 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (!new_snoop_table) {
428 i = -ENOMEM;
429 goto out;
430 }
Roland Dreier528051742008-10-14 14:05:36 -0700431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 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 */
Roland Dreierde6eb662005-11-02 07:23:14 -0800472 mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 if (!mad_snoop_priv) {
474 ret = ERR_PTR(-ENOMEM);
475 goto error1;
476 }
477
478 /* Now, fill in the various structures */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 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;
Sean Hefty1b52fa982006-05-12 14:57:52 -0700487 init_completion(&mad_snoop_priv->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 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
Sean Hefty1b52fa982006-05-12 14:57:52 -0700506static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 port_priv = mad_agent_priv->qp_info->port_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 cancel_delayed_work(&mad_agent_priv->timed_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
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
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700538 flush_workqueue(port_priv->wq);
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700539 ib_cancel_rmpp_recvs(mad_agent_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Sean Hefty1b52fa982006-05-12 14:57:52 -0700541 deref_mad_agent(mad_agent_priv);
542 wait_for_completion(&mad_agent_priv->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Jesper Juhl6044ec82005-11-07 01:01:32 -0800544 kfree(mad_agent_priv->reg_req);
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700545 ib_dereg_mr(mad_agent_priv->agent.mr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 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
Sean Hefty1b52fa982006-05-12 14:57:52 -0700560 deref_snoop_agent(mad_snoop_priv);
561 wait_for_completion(&mad_snoop_priv->comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
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,
Sean Hefty34816ad2005-10-25 10:51:39 -0700604 struct ib_mad_send_buf *send_buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 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,
Sean Hefty34816ad2005-10-25 10:51:39 -0700622 send_buf, mad_send_wc);
Sean Hefty1b52fa982006-05-12 14:57:52 -0700623 deref_snoop_agent(mad_snoop_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 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);
Sean Hefty1b52fa982006-05-12 14:57:52 -0700648 deref_snoop_agent(mad_snoop_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 spin_lock_irqsave(&qp_info->snoop_lock, flags);
650 }
651 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
652}
653
Michael S. Tsirkin062dbb62006-12-31 21:09:42 +0200654static void build_smp_wc(struct ib_qp *qp,
655 u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 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;
Michael S. Tsirkin062dbb62006-12-31 21:09:42 +0200665 wc->qp = qp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 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,
Sean Hefty34816ad2005-10-25 10:51:39 -0700678 struct ib_mad_send_wr_private *mad_send_wr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Hal Rosenstockde493d42007-04-02 11:24:07 -0400680 int ret = 0;
Sean Hefty34816ad2005-10-25 10:51:39 -0700681 struct ib_smp *smp = mad_send_wr->send_buf.mad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 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;
Hal Rosenstock1bae4db2007-05-14 17:21:52 -0400688 u8 port_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 struct ib_wc mad_wc;
Sean Hefty34816ad2005-10-25 10:51:39 -0700690 struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Hal Rosenstock1bae4db2007-05-14 17:21:52 -0400692 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
Ralph Campbell8cf3f042006-02-03 14:28:48 -0800698 /*
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 &&
Hal Rosenstockde493d42007-04-02 11:24:07 -0400706 smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
707 IB_SMI_DISCARD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 ret = -EINVAL;
709 printk(KERN_ERR PFX "Invalid directed route\n");
710 goto out;
711 }
Hal Rosenstockde493d42007-04-02 11:24:07 -0400712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 /* Check to post send on QP or process locally */
Steve Welch727792d2007-10-23 15:06:10 -0700714 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
715 smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 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
Michael S. Tsirkin062dbb62006-12-31 21:09:42 +0200734 build_smp_wc(mad_agent_priv->agent.qp,
735 send_wr->wr_id, be16_to_cpu(smp->dr_slid),
Sean Hefty97f52eb2005-08-13 21:05:57 -0700736 send_wr->wr.ud.pkey_index,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 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:
Sean Hefty2527e682006-07-20 11:25:50 +0300746 if (ib_response_mad(&mad_priv->mad.mad) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 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);
Ralph Campbell4780c192009-03-03 14:22:17 -0800760 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 case IB_MAD_RESULT_SUCCESS:
762 /* Treat like an incoming receive MAD */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
764 mad_agent_priv->agent.port_num);
765 if (port_priv) {
Steve Welch727792d2007-10-23 15:06:10 -0700766 memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 recv_mad_agent = find_mad_agent(port_priv,
Hal Rosenstock4a0754f2005-07-27 11:45:24 -0700768 &mad_priv->mad.mad);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 }
770 if (!port_priv || !recv_mad_agent) {
Ralph Campbell4780c192009-03-03 14:22:17 -0800771 /*
772 * No receiving agent so drop packet and
773 * generate send completion.
774 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 kmem_cache_free(ib_mad_cache, mad_priv);
Ralph Campbell4780c192009-03-03 14:22:17 -0800776 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 }
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
Sean Hefty34816ad2005-10-25 10:51:39 -0700788 local->mad_send_wr = mad_send_wr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 /* 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,
Hal Rosenstockb82cab62005-07-27 11:45:22 -0700796 &mad_agent_priv->local_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 ret = 1;
798out:
799 return ret;
800}
801
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800802static int get_pad_size(int hdr_len, int data_len)
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700803{
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;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800809 return pad == seg_size ? 0 : pad;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700810 } else
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800811 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;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700863}
864
865struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
866 u32 remote_qpn, u16 pkey_index,
Sean Hefty34816ad2005-10-25 10:51:39 -0700867 int rmpp_active,
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700868 int hdr_len, int data_len,
Al Virodd0fc662005-10-07 07:46:04 +0100869 gfp_t gfp_mask)
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700870{
871 struct ib_mad_agent_private *mad_agent_priv;
Sean Hefty34816ad2005-10-25 10:51:39 -0700872 struct ib_mad_send_wr_private *mad_send_wr;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800873 int pad, message_size, ret, size;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700874 void *buf;
875
Sean Hefty34816ad2005-10-25 10:51:39 -0700876 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
877 agent);
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800878 pad = get_pad_size(hdr_len, data_len);
879 message_size = hdr_len + data_len + pad;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700880
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700881 if ((!mad_agent->rmpp_version &&
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800882 (rmpp_active || message_size > sizeof(struct ib_mad))) ||
883 (!rmpp_active && message_size > sizeof(struct ib_mad)))
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700884 return ERR_PTR(-EINVAL);
885
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800886 size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
887 buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700888 if (!buf)
889 return ERR_PTR(-ENOMEM);
890
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800891 mad_send_wr = buf + size;
892 INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
Sean Hefty34816ad2005-10-25 10:51:39 -0700893 mad_send_wr->send_buf.mad = buf;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800894 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;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700897
Sean Hefty34816ad2005-10-25 10:51:39 -0700898 mad_send_wr->mad_agent_priv = mad_agent_priv;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800899 mad_send_wr->sg_list[0].length = hdr_len;
Sean Hefty34816ad2005-10-25 10:51:39 -0700900 mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800901 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;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700903
Sean Hefty34816ad2005-10-25 10:51:39 -0700904 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;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800906 mad_send_wr->send_wr.num_sge = 2;
Sean Hefty34816ad2005-10-25 10:51:39 -0700907 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;
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700912
913 if (rmpp_active) {
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800914 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
915 if (ret) {
916 kfree(buf);
917 return ERR_PTR(ret);
918 }
Hal Rosenstockfa619a72005-07-27 11:45:37 -0700919 }
920
Sean Hefty34816ad2005-10-25 10:51:39 -0700921 mad_send_wr->send_buf.mad_agent = mad_agent;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700922 atomic_inc(&mad_agent_priv->refcount);
Sean Hefty34816ad2005-10-25 10:51:39 -0700923 return &mad_send_wr->send_buf;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700924}
925EXPORT_SYMBOL(ib_create_send_mad);
926
Hal Rosenstock618a3c02006-03-28 16:40:04 -0800927int 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
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800956void *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
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700988void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
989{
990 struct ib_mad_agent_private *mad_agent_priv;
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800991 struct ib_mad_send_wr_private *mad_send_wr;
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700992
993 mad_agent_priv = container_of(send_buf->mad_agent,
994 struct ib_mad_agent_private, agent);
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800995 mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
996 send_buf);
Hal Rosenstock824c8ae2005-07-27 11:45:23 -0700997
Jack Morgensteinf36e1792006-03-03 21:54:13 -0800998 free_send_rmpp_list(mad_send_wr);
999 kfree(send_buf->mad);
Sean Hefty1b52fa982006-05-12 14:57:52 -07001000 deref_mad_agent(mad_agent_priv);
Hal Rosenstock824c8ae2005-07-27 11:45:23 -07001001}
1002EXPORT_SYMBOL(ib_free_send_mad);
1003
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001004int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005{
1006 struct ib_mad_qp_info *qp_info;
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07001007 struct list_head *list;
Sean Hefty34816ad2005-10-25 10:51:39 -07001008 struct ib_send_wr *bad_send_wr;
1009 struct ib_mad_agent *mad_agent;
1010 struct ib_sge *sge;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 unsigned long flags;
1012 int ret;
1013
Hal Rosenstockf8197a42005-07-27 11:45:24 -07001014 /* Set WR ID to find mad_send_wr upon completion */
Hal Rosenstockd760ce82005-07-27 11:45:25 -07001015 qp_info = mad_send_wr->mad_agent_priv->qp_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 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
Sean Hefty34816ad2005-10-25 10:51:39 -07001019 mad_agent = mad_send_wr->send_buf.mad_agent;
1020 sge = mad_send_wr->sg_list;
Ralph Campbell15271062006-12-12 14:28:30 -08001021 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;
Jack Morgensteinf36e1792006-03-03 21:54:13 -08001026
Ralph Campbell15271062006-12-12 14:28:30 -08001027 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;
Sean Hefty34816ad2005-10-25 10:51:39 -07001032
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 spin_lock_irqsave(&qp_info->send_queue.lock, flags);
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07001034 if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
Sean Hefty34816ad2005-10-25 10:51:39 -07001035 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1036 &bad_send_wr);
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07001037 list = &qp_info->send_queue.list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 ret = 0;
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07001040 list = &qp_info->overflow_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 }
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07001042
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);
Jack Morgensteinf36e1792006-03-03 21:54:13 -08001048 if (ret) {
Ralph Campbell15271062006-12-12 14:28:30 -08001049 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);
Jack Morgensteinf36e1792006-03-03 21:54:13 -08001055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 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 */
Sean Hefty34816ad2005-10-25 10:51:39 -07001063int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1064 struct ib_mad_send_buf **bad_send_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 struct ib_mad_agent_private *mad_agent_priv;
Sean Hefty34816ad2005-10-25 10:51:39 -07001067 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072 /* Walk list of send WRs and post each on send list */
Sean Hefty34816ad2005-10-25 10:51:39 -07001073 for (; send_buf; send_buf = next_send_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
Sean Hefty34816ad2005-10-25 10:51:39 -07001075 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
Sean Hefty34816ad2005-10-25 10:51:39 -07001080 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 }
1086
Hal Rosenstock618a3c02006-03-28 16:40:04 -08001087 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 /*
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 */
Sean Hefty34816ad2005-10-25 10:51:39 -07001099 next_send_buf = send_buf->next;
1100 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Sean Hefty34816ad2005-10-25 10:51:39 -07001102 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 if (ret < 0) /* error */
Sean Hefty34816ad2005-10-25 10:51:39 -07001107 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 else if (ret == 1) /* locally consumed */
Sean Hefty34816ad2005-10-25 10:51:39 -07001109 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 }
1111
Sean Hefty34816ad2005-10-25 10:51:39 -07001112 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 /* Timeout will be updated after send completes */
Sean Hefty34816ad2005-10-25 10:51:39 -07001114 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
Sean Hefty4fc8cd42007-11-27 00:11:04 -08001115 mad_send_wr->max_retries = send_buf->retries;
1116 mad_send_wr->retries_left = send_buf->retries;
1117 send_buf->retries = 0;
Sean Hefty34816ad2005-10-25 10:51:39 -07001118 /* Reference for work request to QP + response */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 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
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001129 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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 /* 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);
Sean Hefty34816ad2005-10-25 10:51:39 -07001141 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 }
1144 return 0;
Sean Hefty34816ad2005-10-25 10:51:39 -07001145error:
1146 if (bad_send_buf)
1147 *bad_send_buf = send_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 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{
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001158 struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 struct ib_mad_private_header *mad_priv_hdr;
1160 struct ib_mad_private *priv;
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001161 struct list_head free_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001163 INIT_LIST_HEAD(&free_list);
1164 list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001166 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 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);
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001175 kmem_cache_free(ib_mad_cache, priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177}
1178EXPORT_SYMBOL(ib_free_recv_mad);
1179
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180struct 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
Akinobu Mita19b629f2010-03-05 13:41:38 -08001203 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 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 */
Roland Dreierde6eb662005-11-02 07:23:14 -08001215 *method = kzalloc(sizeof **method, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 if (!*method) {
1217 printk(KERN_ERR PFX "No memory for "
1218 "ib_mad_mgmt_method_table\n");
1219 return -ENOMEM;
1220 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
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++)
Roland Dreier3cd96562006-09-22 15:22:46 -07001267 /* Is there matching OUI for this vendor class ? */
1268 if (!memcmp(vendor_class->oui[i], oui, 3))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 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 */
Roland Dreierde6eb662005-11-02 07:23:14 -08001311 *class = kzalloc(sizeof **class, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 if (!*class) {
1313 printk(KERN_ERR PFX "No memory for "
1314 "ib_mad_mgmt_class_table\n");
1315 ret = -ENOMEM;
1316 goto error1;
1317 }
Roland Dreierde6eb662005-11-02 07:23:14 -08001318
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 /* 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 */
Akinobu Mita19b629f2010-03-05 13:41:38 -08001337 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 (*method)->agent[i] = agent_priv;
Akinobu Mita19b629f2010-03-05 13:41:38 -08001339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 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 */
Roland Dreierde6eb662005-11-02 07:23:14 -08001378 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 if (!vendor) {
1380 printk(KERN_ERR PFX "No memory for "
1381 "ib_mad_mgmt_vendor_class_table\n");
1382 goto error1;
1383 }
Roland Dreierde6eb662005-11-02 07:23:14 -08001384
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 *vendor_table = vendor;
1386 }
1387 if (!(*vendor_table)->vendor_class[vclass]) {
1388 /* Allocate table for this management vendor class */
Roland Dreierde6eb662005-11-02 07:23:14 -08001389 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 if (!vendor_class) {
1391 printk(KERN_ERR PFX "No memory for "
1392 "ib_mad_mgmt_vendor_class\n");
1393 goto error2;
1394 }
Roland Dreierde6eb662005-11-02 07:23:14 -08001395
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 (*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 */
Akinobu Mita19b629f2010-03-05 13:41:38 -08001432 for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 (*method)->agent[i] = agent_priv;
Akinobu Mita19b629f2010-03-05 13:41:38 -08001434
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558static struct ib_mad_agent_private *
1559find_mad_agent(struct ib_mad_port_private *port_priv,
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001560 struct ib_mad *mad)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561{
1562 struct ib_mad_agent_private *mad_agent = NULL;
1563 unsigned long flags;
1564
1565 spin_lock_irqsave(&port_priv->reg_lock, flags);
Sean Hefty2527e682006-07-20 11:25:50 +03001566 if (ib_response_mad(mad)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 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;
Sean Hefty34816ad2005-10-25 10:51:39 -07001575 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 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;
Hefty, Seanb7ab0b12011-10-06 09:33:05 -07001600 if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
1601 IB_MGMT_MAX_METHODS)
1602 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 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
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001672static 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
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001684static 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
Jack Morgenstein9874e742006-06-17 20:37:34 -07001691static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1692 struct ib_mad_send_wr_private *wr,
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001693 struct ib_mad_recv_wc *rwc )
1694{
1695 struct ib_ah_attr attr;
1696 u8 send_resp, rcv_resp;
Jack Morgenstein9874e742006-06-17 20:37:34 -07001697 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;
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001701
Michael Brooks70972282008-09-20 20:06:16 -07001702 send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1703 rcv_resp = ib_response_mad(rwc->recv_buf.mad);
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001704
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001705 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
Jack Morgenstein9874e742006-06-17 20:37:34 -07001713 if (!!(attr.ah_flags & IB_AH_GRH) !=
1714 !!(rwc->wc->wc_flags & IB_WC_GRH))
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001715 /* one has GID, other does not. Assume different */
1716 return 0;
Jack Morgenstein9874e742006-06-17 20:37:34 -07001717
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);
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001740}
Jack Morgenstein9874e742006-06-17 20:37:34 -07001741
1742static inline int is_direct(u8 class)
1743{
1744 return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1745}
1746
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001747struct ib_mad_send_wr_private*
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001748ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
Jack Morgenstein9874e742006-06-17 20:37:34 -07001749 struct ib_mad_recv_wc *wc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750{
Jack Morgenstein9874e742006-06-17 20:37:34 -07001751 struct ib_mad_send_wr_private *wr;
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001752 struct ib_mad *mad;
1753
Jack Morgenstein9874e742006-06-17 20:37:34 -07001754 mad = (struct ib_mad *)wc->recv_buf.mad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755
Jack Morgenstein9874e742006-06-17 20:37:34 -07001756 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)))
Roland Dreier39798692006-11-13 09:38:07 -08001765 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 }
1767
1768 /*
1769 * It's possible to receive the response before we've
1770 * been notified that the send has completed
1771 */
Jack Morgenstein9874e742006-06-17 20:37:34 -07001772 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)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 /* Verify request has not been canceled */
Jack Morgenstein9874e742006-06-17 20:37:34 -07001784 return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 }
1786 return NULL;
1787}
1788
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001789void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
Hal Rosenstock6a0c4352005-07-27 11:45:26 -07001790{
1791 mad_send_wr->timeout = 0;
Akinobu Mita179e0912006-06-26 00:24:41 -07001792 if (mad_send_wr->refcount == 1)
1793 list_move_tail(&mad_send_wr->agent_list,
Hal Rosenstock6a0c4352005-07-27 11:45:26 -07001794 &mad_send_wr->mad_agent_priv->done_list);
Hal Rosenstock6a0c4352005-07-27 11:45:26 -07001795}
1796
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001798 struct ib_mad_recv_wc *mad_recv_wc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799{
1800 struct ib_mad_send_wr_private *mad_send_wr;
1801 struct ib_mad_send_wc mad_send_wc;
1802 unsigned long flags;
1803
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001804 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) {
Sean Hefty1b52fa982006-05-12 14:57:52 -07001810 deref_mad_agent(mad_agent_priv);
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001811 return;
1812 }
1813 }
1814
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815 /* Complete corresponding request */
Sean Hefty2527e682006-07-20 11:25:50 +03001816 if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 spin_lock_irqsave(&mad_agent_priv->lock, flags);
Jack Morgensteinfa9656b2006-03-28 16:39:07 -08001818 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 if (!mad_send_wr) {
1820 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001821 ib_free_recv_mad(mad_recv_wc);
Sean Hefty1b52fa982006-05-12 14:57:52 -07001822 deref_mad_agent(mad_agent_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 return;
1824 }
Hal Rosenstockfa619a72005-07-27 11:45:37 -07001825 ib_mark_mad_done(mad_send_wr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1827
1828 /* Defined behavior is to complete response before request */
Sean Hefty34816ad2005-10-25 10:51:39 -07001829 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001830 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1831 mad_recv_wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 atomic_dec(&mad_agent_priv->refcount);
1833
1834 mad_send_wc.status = IB_WC_SUCCESS;
1835 mad_send_wc.vendor_err = 0;
Sean Hefty34816ad2005-10-25 10:51:39 -07001836 mad_send_wc.send_buf = &mad_send_wr->send_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1838 } else {
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001839 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1840 mad_recv_wc);
Sean Hefty1b52fa982006-05-12 14:57:52 -07001841 deref_mad_agent(mad_agent_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 }
1843}
1844
Swapna Thete0b307042012-02-25 17:47:32 -08001845static 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);
Jack Morgenstein840777d2012-04-24 16:06:50 -07001857 if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1858 response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION;
Swapna Thete0b307042012-02-25 17:47:32 -08001859
1860 return true;
1861 } else {
1862 return false;
1863 }
1864}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865static 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;
Hal Rosenstock445d6802007-08-03 10:45:17 -07001870 struct ib_mad_private *recv, *response = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 struct ib_mad_list_head *mad_list;
1872 struct ib_mad_agent_private *mad_agent;
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001873 int port_num;
Jack Morgensteina9e74322012-04-24 16:08:57 -07001874 int ret = IB_MAD_RESULT_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 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);
Ralph Campbell15271062006-12-12 14:28:30 -08001883 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
1889 /* Setup MAD receive work completion from "normal" work completion */
Sean Hefty24239af2005-04-16 15:26:08 -07001890 recv->header.wc = *wc;
1891 recv->header.recv_wc.wc = &recv->header.wc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 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
Hal Rosenstock445d6802007-08-03 10:45:17 -07001903 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
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001910 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 if (recv->mad.mad.mad_hdr.mgmt_class ==
1916 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001917 enum smi_forward_action retsmi;
1918
Hal Rosenstockde493d42007-04-02 11:24:07 -04001919 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1920 port_priv->device->node_type,
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001921 port_num,
Hal Rosenstockde493d42007-04-02 11:24:07 -04001922 port_priv->device->phys_port_cnt) ==
1923 IB_SMI_DISCARD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 goto out;
Hal Rosenstockde493d42007-04-02 11:24:07 -04001925
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001926 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1927 if (retsmi == IB_SMI_LOCAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 goto local;
Hal Rosenstockde493d42007-04-02 11:24:07 -04001929
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001930 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;
Hal Rosenstockde493d42007-04-02 11:24:07 -04001935
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001936 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
Hal Rosenstock86dfbec2007-08-03 10:45:17 -07001945 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);
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001950
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 goto out;
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001952 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 }
1954
1955local:
1956 /* Give driver "right of first refusal" on incoming MAD */
1957 if (port_priv->device->process_mad) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 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) {
Sean Hefty34816ad2005-10-25 10:51:39 -07001967 agent_send_response(&response->mad.mad,
1968 &recv->grh, wc,
1969 port_priv->device,
Hal Rosenstock1bae4db2007-05-14 17:21:52 -04001970 port_num,
Sean Hefty34816ad2005-10-25 10:51:39 -07001971 qp_info->qp->qp_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 goto out;
1973 }
1974 }
1975 }
1976
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001977 mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 if (mad_agent) {
Hal Rosenstock4a0754f2005-07-27 11:45:24 -07001979 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 /*
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;
Jack Morgensteina9e74322012-04-24 16:08:57 -07001985 } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
1986 generate_unmatched_resp(recv, response)) {
Swapna Thete0b307042012-02-25 17:47:32 -08001987 agent_send_response(&response->mad.mad, &recv->grh, wc,
1988 port_priv->device, port_num, qp_info->qp->qp_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 }
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)) {
Roland Dreier6b2eef82009-09-07 08:27:50 -07002007 __cancel_delayed_work(&mad_agent_priv->timed_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 } 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;
Roland Dreier6b2eef82009-09-07 08:27:50 -07002016 __cancel_delayed_work(&mad_agent_priv->timed_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 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
Hal Rosenstockd760ce82005-07-27 11:45:25 -07002027static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028{
Hal Rosenstockd760ce82005-07-27 11:45:25 -07002029 struct ib_mad_agent_private *mad_agent_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 struct ib_mad_send_wr_private *temp_mad_send_wr;
2031 struct list_head *list_item;
2032 unsigned long delay;
2033
Hal Rosenstockd760ce82005-07-27 11:45:25 -07002034 mad_agent_priv = mad_send_wr->mad_agent_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 list_del(&mad_send_wr->agent_list);
2036
2037 delay = mad_send_wr->timeout;
2038 mad_send_wr->timeout += jiffies;
2039
Hal Rosenstock29bb33d2005-07-27 11:45:32 -07002040 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 }
Hal Rosenstock29bb33d2005-07-27 11:45:32 -07002050 else
2051 list_item = &mad_agent_priv->wait_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 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) {
Roland Dreier6b2eef82009-09-07 08:27:50 -07002056 __cancel_delayed_work(&mad_agent_priv->timed_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2058 &mad_agent_priv->timed_work, delay);
2059 }
2060}
2061
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002062void 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069/*
2070 * Process a send work completion
2071 */
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002072void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2073 struct ib_mad_send_wc *mad_send_wc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074{
2075 struct ib_mad_agent_private *mad_agent_priv;
2076 unsigned long flags;
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002077 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078
Hal Rosenstockd760ce82005-07-27 11:45:25 -07002079 mad_agent_priv = mad_send_wr->mad_agent_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 spin_lock_irqsave(&mad_agent_priv->lock, flags);
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002081 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 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) {
Hal Rosenstockd760ce82005-07-27 11:45:25 -07002097 wait_for_response(mad_send_wr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 }
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002099 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 }
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;
Sean Hefty34816ad2005-10-25 10:51:39 -07002109 if (ret == IB_RMPP_RESULT_INTERNAL)
2110 ib_rmpp_send_handler(mad_send_wc);
2111 else
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002112 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2113 mad_send_wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114
2115 /* Release reference on agent taken when sending */
Sean Hefty1b52fa982006-05-12 14:57:52 -07002116 deref_mad_agent(mad_agent_priv);
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002117 return;
2118done:
2119 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120}
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;
Sean Hefty34816ad2005-10-25 10:51:39 -07002130 struct ib_mad_send_wc mad_send_wc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 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:
Ralph Campbell15271062006-12-12 14:28:30 -08002141 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 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);
Akinobu Mita179e0912006-06-26 00:24:41 -07002158 list_move_tail(&mad_list->list, &send_queue->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 }
2160 spin_unlock_irqrestore(&send_queue->lock, flags);
2161
Sean Hefty34816ad2005-10-25 10:51:39 -07002162 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165 if (atomic_read(&qp_info->snoop_count))
Sean Hefty34816ad2005-10-25 10:51:39 -07002166 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 IB_MAD_SNOOP_SEND_COMPLETIONS);
Sean Hefty34816ad2005-10-25 10:51:39 -07002168 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169
2170 if (queued_send_wr) {
2171 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
Sean Hefty34816ad2005-10-25 10:51:39 -07002172 &bad_send_wr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 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 */
David Howellsc4028952006-11-22 14:57:56 +00002258static void ib_mad_completion_handler(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259{
2260 struct ib_mad_port_private *port_priv;
2261 struct ib_wc wc;
2262
David Howellsc4028952006-11-22 14:57:56 +00002263 port_priv = container_of(work, struct ib_mad_port_private, work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 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) {
Roland Dreier3cd96562006-09-22 15:22:46 -07002297 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298 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) {
Sean Hefty34816ad2005-10-25 10:51:39 -07002312 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2313 list_del(&mad_send_wr->agent_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2315 &mad_send_wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 atomic_dec(&mad_agent_priv->refcount);
2317 }
2318}
2319
2320static struct ib_mad_send_wr_private*
Sean Hefty34816ad2005-10-25 10:51:39 -07002321find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2322 struct ib_mad_send_buf *send_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323{
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) {
Sean Hefty34816ad2005-10-25 10:51:39 -07002328 if (&mad_send_wr->send_buf == send_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 return mad_send_wr;
2330 }
2331
2332 list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2333 agent_list) {
Sean Hefty34816ad2005-10-25 10:51:39 -07002334 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2335 &mad_send_wr->send_buf == send_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002336 return mad_send_wr;
2337 }
2338 return NULL;
2339}
2340
Sean Hefty34816ad2005-10-25 10:51:39 -07002341int ib_modify_mad(struct ib_mad_agent *mad_agent,
2342 struct ib_mad_send_buf *send_buf, u32 timeout_ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343{
2344 struct ib_mad_agent_private *mad_agent_priv;
2345 struct ib_mad_send_wr_private *mad_send_wr;
2346 unsigned long flags;
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07002347 int active;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348
2349 mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2350 agent);
2351 spin_lock_irqsave(&mad_agent_priv->lock, flags);
Sean Hefty34816ad2005-10-25 10:51:39 -07002352 mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002353 if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002355 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356 }
2357
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07002358 active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002359 if (!timeout_ms) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002361 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362 }
2363
Sean Hefty34816ad2005-10-25 10:51:39 -07002364 mad_send_wr->send_buf.timeout_ms = timeout_ms;
Hal Rosenstockcabe3cb2005-07-27 11:45:33 -07002365 if (active)
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002366 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2367 else
2368 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002370 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2371 return 0;
2372}
2373EXPORT_SYMBOL(ib_modify_mad);
2374
Sean Hefty34816ad2005-10-25 10:51:39 -07002375void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2376 struct ib_mad_send_buf *send_buf)
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002377{
Sean Hefty34816ad2005-10-25 10:51:39 -07002378 ib_modify_mad(mad_agent, send_buf, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379}
2380EXPORT_SYMBOL(ib_cancel_mad);
2381
David Howellsc4028952006-11-22 14:57:56 +00002382static void local_completions(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383{
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;
Ralph Campbell1d9bc6d62009-02-27 10:34:30 -08002388 int free_mad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389 struct ib_wc wc;
2390 struct ib_mad_send_wc mad_send_wc;
2391
David Howellsc4028952006-11-22 14:57:56 +00002392 mad_agent_priv =
2393 container_of(work, struct ib_mad_agent_private, local_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394
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);
Michael S. Tsirkin37289ef2006-03-30 15:52:54 +02002400 list_del(&local->completion_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
Ralph Campbell1d9bc6d62009-02-27 10:34:30 -08002402 free_mad = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 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");
Ralph Campbell1d9bc6d62009-02-27 10:34:30 -08002407 free_mad = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002408 goto local_send_completion;
2409 }
2410
2411 /*
2412 * Defined behavior is to complete response
2413 * before request
2414 */
Michael S. Tsirkin062dbb62006-12-31 21:09:42 +02002415 build_smp_wc(recv_mad_agent->agent.qp,
2416 (unsigned long) local->mad_send_wr,
Sean Hefty97f52eb2005-08-13 21:05:57 -07002417 be16_to_cpu(IB_LID_PERMISSIVE),
Sean Hefty34816ad2005-10-25 10:51:39 -07002418 0, recv_mad_agent->agent.port_num, &wc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419
2420 local->mad_priv->header.recv_wc.wc = &wc;
2421 local->mad_priv->header.recv_wc.mad_len =
2422 sizeof(struct ib_mad);
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002423 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426 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;
Sean Hefty34816ad2005-10-25 10:51:39 -07002445 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002446 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
Sean Hefty34816ad2005-10-25 10:51:39 -07002447 snoop_send(mad_agent_priv->qp_info,
2448 &local->mad_send_wr->send_buf,
2449 &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002450 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2451 &mad_send_wc);
2452
2453 spin_lock_irqsave(&mad_agent_priv->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454 atomic_dec(&mad_agent_priv->refcount);
Ralph Campbell1d9bc6d62009-02-27 10:34:30 -08002455 if (free_mad)
Hal Rosenstock2c153b92005-07-27 11:45:31 -07002456 kmem_cache_free(ib_mad_cache, local->mad_priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457 kfree(local);
2458 }
2459 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2460}
2461
Hal Rosenstockf75b7a52005-07-27 11:45:29 -07002462static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2463{
2464 int ret;
2465
Sean Hefty4fc8cd42007-11-27 00:11:04 -08002466 if (!mad_send_wr->retries_left)
Hal Rosenstockf75b7a52005-07-27 11:45:29 -07002467 return -ETIMEDOUT;
2468
Sean Hefty4fc8cd42007-11-27 00:11:04 -08002469 mad_send_wr->retries_left--;
2470 mad_send_wr->send_buf.retries++;
2471
Sean Hefty34816ad2005-10-25 10:51:39 -07002472 mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
Hal Rosenstockf75b7a52005-07-27 11:45:29 -07002473
Hal Rosenstockfa619a72005-07-27 11:45:37 -07002474 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);
Hal Rosenstockf75b7a52005-07-27 11:45:29 -07002489
2490 if (!ret) {
2491 mad_send_wr->refcount++;
Hal Rosenstockf75b7a52005-07-27 11:45:29 -07002492 list_add_tail(&mad_send_wr->agent_list,
2493 &mad_send_wr->mad_agent_priv->send_list);
2494 }
2495 return ret;
2496}
2497
David Howellsc4028952006-11-22 14:57:56 +00002498static void timeout_sends(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499{
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
David Howellsc4028952006-11-22 14:57:56 +00002505 mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2506 timed_work.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002507 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
Hal Rosenstockdbf92272005-07-27 11:45:30 -07002525 list_del(&mad_send_wr->agent_list);
Hal Rosenstock29bb33d2005-07-27 11:45:32 -07002526 if (mad_send_wr->status == IB_WC_SUCCESS &&
2527 !retry_send(mad_send_wr))
Hal Rosenstockf75b7a52005-07-27 11:45:29 -07002528 continue;
2529
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2531
Hal Rosenstock03b61ad2005-07-27 11:45:32 -07002532 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;
Sean Hefty34816ad2005-10-25 10:51:39 -07002536 mad_send_wc.send_buf = &mad_send_wr->send_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2538 &mad_send_wc);
2539
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 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
Hal Rosenstock5dd2ce12005-08-15 14:16:36 -07002546static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547{
2548 struct ib_mad_port_private *port_priv = cq->cq_context;
Michael S. Tsirkindc059802006-03-20 10:08:25 -08002549 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550
Michael S. Tsirkindc059802006-03-20 10:08:25 -08002551 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555}
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 }
Ralph Campbell15271062006-12-12 14:28:30 -08002592 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598 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);
Ralph Campbell15271062006-12-12 14:28:30 -08002612 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002617 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
Eli Cohenfac70d52010-09-27 17:51:11 -07002635 if (!qp_info->qp)
2636 return;
2637
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 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
Ralph Campbell15271062006-12-12 14:28:30 -08002651 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656 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);
Roland Dreier3cd96562006-09-22 15:22:46 -07002672 if (!attr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 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;
Eli Cohenfac70d52010-09-27 17:51:11 -07002679 if (!qp)
2680 continue;
2681
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682 /*
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++) {
Eli Cohenfac70d52010-09-27 17:51:11 -07002723 if (!port_priv->qp_info[i].qp)
2724 continue;
2725
Linus Torvalds1da177e2005-04-16 15:20:36 -07002726 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;
Hal Rosenstockb76aabc2009-09-07 08:28:48 -07002778 qp_init_attr.cap.max_send_wr = mad_sendq_size;
2779 qp_init_attr.cap.max_recv_wr = mad_recvq_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780 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 */
Hal Rosenstockb76aabc2009-09-07 08:28:48 -07002794 qp_info->send_queue.max_active = mad_sendq_size;
2795 qp_info->recv_queue.max_active = mad_recvq_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002796 return 0;
2797
2798error:
2799 return ret;
2800}
2801
2802static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2803{
Eli Cohenfac70d52010-09-27 17:51:11 -07002804 if (!qp_info->qp)
2805 return;
2806
Linus Torvalds1da177e2005-04-16 15:20:36 -07002807 ib_destroy_qp(qp_info->qp);
Jesper Juhl6044ec82005-11-07 01:01:32 -08002808 kfree(qp_info->snoop_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809}
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"];
Eli Cohenfac70d52010-09-27 17:51:11 -07002822 int has_smi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823
Linus Torvalds1da177e2005-04-16 15:20:36 -07002824 /* Create new device info */
Roland Dreierde6eb662005-11-02 07:23:14 -08002825 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826 if (!port_priv) {
2827 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2828 return -ENOMEM;
2829 }
Roland Dreierde6eb662005-11-02 07:23:14 -08002830
Linus Torvalds1da177e2005-04-16 15:20:36 -07002831 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
Eli Cohenfac70d52010-09-27 17:51:11 -07002838 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843 port_priv->cq = ib_create_cq(port_priv->device,
Hal Rosenstock5dd2ce12005-08-15 14:16:36 -07002844 ib_mad_thread_completion_handler,
Michael S. Tsirkinf4fd0b22007-05-03 13:48:47 +03002845 NULL, port_priv, cq_size, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 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
Eli Cohenfac70d52010-09-27 17:51:11 -07002866 if (has_smi) {
2867 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2868 if (ret)
2869 goto error6;
2870 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 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 }
David Howellsc4028952006-11-22 14:57:56 +00002881 INIT_WORK(&port_priv->work, ib_mad_completion_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882
Michael S. Tsirkindc059802006-03-20 10:08:25 -08002883 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893 return 0;
2894
2895error9:
Michael S. Tsirkindc059802006-03-20 10:08:25 -08002896 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 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 }
Michael S. Tsirkindc059802006-03-20 10:08:25 -08002936 list_del_init(&port_priv->port_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2938
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939 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{
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002956 int start, end, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957
Tom Tucker07ebafb2006-08-03 16:02:42 -05002958 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2959 return;
2960
2961 if (device->node_type == RDMA_NODE_IB_SWITCH) {
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002962 start = 0;
2963 end = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964 } else {
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002965 start = 1;
2966 end = device->phys_port_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967 }
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002968
2969 for (i = start; i <= end; i++) {
2970 if (ib_mad_port_open(device, i)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 printk(KERN_ERR PFX "Couldn't open %s port %d\n",
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002972 device->name, i);
2973 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974 }
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002975 if (ib_agent_port_open(device, i)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976 printk(KERN_ERR PFX "Couldn't open %s port %d "
2977 "for agents\n",
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002978 device->name, i);
2979 goto error_agent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980 }
2981 }
Hal Rosenstockf68bcc22005-07-27 11:45:27 -07002982 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002984error_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))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994 printk(KERN_ERR PFX "Couldn't close %s port %d "
2995 "for agents\n",
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002996 device->name, i);
2997 if (ib_mad_port_close(device, i))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
Roland Dreier4ab6fb72005-10-06 13:28:16 -07002999 device->name, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003000 i--;
3001 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003002}
3003
3004static void ib_mad_remove_device(struct ib_device *device)
3005{
Hal Rosenstockf68bcc22005-07-27 11:45:27 -07003006 int i, num_ports, cur_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007
Steve Wise070e1402010-03-04 18:18:18 +00003008 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3009 return;
3010
Tom Tucker07ebafb2006-08-03 16:02:42 -05003011 if (device->node_type == RDMA_NODE_IB_SWITCH) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012 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++) {
Hal Rosenstockf68bcc22005-07-27 11:45:27 -07003019 if (ib_agent_port_close(device, cur_port))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 printk(KERN_ERR PFX "Couldn't close %s port %d "
3021 "for agents\n",
3022 device->name, cur_port);
Hal Rosenstockf68bcc22005-07-27 11:45:27 -07003023 if (ib_mad_port_close(device, cur_port))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
3025 device->name, cur_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 }
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
Hal Rosenstockb76aabc2009-09-07 08:28:48 -07003039 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045 ib_mad_cache = kmem_cache_create("ib_mad",
3046 sizeof(struct ib_mad_private),
3047 0,
3048 SLAB_HWCACHE_ALIGN,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 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);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07003075 kmem_cache_destroy(ib_mad_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003076}
3077
3078module_init(ib_mad_init_module);
3079module_exit(ib_mad_cleanup_module);