drivers/infiniband/core/mad.c

   1 /*
   2  * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  */
  35 #include <linux/dma-mapping.h>
  36 #include <rdma/ib_cache.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40 #include "smi.h"
  41 #include "agent.h"
  42
  43 MODULE_LICENSE("Dual BSD/GPL");
  44 MODULE_DESCRIPTION("kernel IB MAD API");
  45 MODULE_AUTHOR("Hal Rosenstock");
  46 MODULE_AUTHOR("Sean Hefty");
  47
  48 static struct kmem_cache *ib_mad_cache;
  49
  50 static struct list_head ib_mad_port_list;
  51 static u32 ib_mad_client_id = 0;
  52
  53 /* Port list lock */
  54 static spinlock_t ib_mad_port_list_lock;
  55
  56
  57 /* Forward declarations */
  58 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  59                          struct ib_mad_reg_req *mad_reg_req);
  60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  61 static struct ib_mad_agent_private *find_mad_agent(
  62                                         struct ib_mad_port_private *port_priv,
  63                                         struct ib_mad *mad);
  64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  65                                     struct ib_mad_private *mad);
  66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  67 static void timeout_sends(struct work_struct *work);
  68 static void local_completions(struct work_struct *work);
  69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  70                               struct ib_mad_agent_private *agent_priv,
  71                               u8 mgmt_class);
  72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  73                            struct ib_mad_agent_private *agent_priv);
  74
  75 /*
  76  * Returns a ib_mad_port_private structure or NULL for a device/port
  77  * Assumes ib_mad_port_list_lock is being held
  78  */
  79 static inline struct ib_mad_port_private *
  80 __ib_get_mad_port(struct ib_device *device, int port_num)
  81 {
  82         struct ib_mad_port_private *entry;
  83
  84         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  85                 if (entry->device == device && entry->port_num == port_num)
  86                         return entry;
  87         }
  88         return NULL;
  89 }
  90
  91 /*
  92  * Wrapper function to return a ib_mad_port_private structure or NULL
  93  * for a device/port
  94  */
  95 static inline struct ib_mad_port_private *
  96 ib_get_mad_port(struct ib_device *device, int port_num)
  97 {
  98         struct ib_mad_port_private *entry;
  99         unsigned long flags;
 100
 101         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 102         entry = __ib_get_mad_port(device, port_num);
 103         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 104
 105         return entry;
 106 }
 107
 108 static inline u8 convert_mgmt_class(u8 mgmt_class)
 109 {
 110         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 111         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 112                 0 : mgmt_class;
 113 }
 114
 115 static int get_spl_qp_index(enum ib_qp_type qp_type)
 116 {
 117         switch (qp_type)
 118         {
 119         case IB_QPT_SMI:
 120                 return 0;
 121         case IB_QPT_GSI:
 122                 return 1;
 123         default:
 124                 return -1;
 125         }
 126 }
 127
 128 static int vendor_class_index(u8 mgmt_class)
 129 {
 130         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 131 }
 132
 133 static int is_vendor_class(u8 mgmt_class)
 134 {
 135         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 136             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 137                 return 0;
 138         return 1;
 139 }
 140
 141 static int is_vendor_oui(char *oui)
 142 {
 143         if (oui[0] || oui[1] || oui[2])
 144                 return 1;
 145         return 0;
 146 }
 147
 148 static int is_vendor_method_in_use(
 149                 struct ib_mad_mgmt_vendor_class *vendor_class,
 150                 struct ib_mad_reg_req *mad_reg_req)
 151 {
 152         struct ib_mad_mgmt_method_table *method;
 153         int i;
 154
 155         for (i = 0; i < MAX_MGMT_OUI; i++) {
 156                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 157                         method = vendor_class->method_table[i];
 158                         if (method) {
 159                                 if (method_in_use(&method, mad_reg_req))
 160                                         return 1;
 161                                 else
 162                                         break;
 163                         }
 164                 }
 165         }
 166         return 0;
 167 }
 168
 169 int ib_response_mad(struct ib_mad *mad)
 170 {
 171         return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
 172                 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 173                 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
 174                  (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
 175 }
 176 EXPORT_SYMBOL(ib_response_mad);
 177
 178 /*
 179  * ib_register_mad_agent - Register to send/receive MADs
 180  */
 181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 182                                            u8 port_num,
 183                                            enum ib_qp_type qp_type,
 184                                            struct ib_mad_reg_req *mad_reg_req,
 185                                            u8 rmpp_version,
 186                                            ib_mad_send_handler send_handler,
 187                                            ib_mad_recv_handler recv_handler,
 188                                            void *context)
 189 {
 190         struct ib_mad_port_private *port_priv;
 191         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 192         struct ib_mad_agent_private *mad_agent_priv;
 193         struct ib_mad_reg_req *reg_req = NULL;
 194         struct ib_mad_mgmt_class_table *class;
 195         struct ib_mad_mgmt_vendor_class_table *vendor;
 196         struct ib_mad_mgmt_vendor_class *vendor_class;
 197         struct ib_mad_mgmt_method_table *method;
 198         int ret2, qpn;
 199         unsigned long flags;
 200         u8 mgmt_class, vclass;
 201
 202         /* Validate parameters */
 203         qpn = get_spl_qp_index(qp_type);
 204         if (qpn == -1)
 205                 goto error1;
 206
 207         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 208                 goto error1;
 209
 210         /* Validate MAD registration request if supplied */
 211         if (mad_reg_req) {
 212                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 213                         goto error1;
 214                 if (!recv_handler)
 215                         goto error1;
 216                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 217                         /*
 218                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 219                          * one in this range currently allowed
 220                          */
 221                         if (mad_reg_req->mgmt_class !=
 222                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 223                                 goto error1;
 224                 } else if (mad_reg_req->mgmt_class == 0) {
 225                         /*
 226                          * Class 0 is reserved in IBA and is used for
 227                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 228                          */
 229                         goto error1;
 230                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 231                         /*
 232                          * If class is in "new" vendor range,
 233                          * ensure supplied OUI is not zero
 234                          */
 235                         if (!is_vendor_oui(mad_reg_req->oui))
 236                                 goto error1;
 237                 }
 238                 /* Make sure class supplied is consistent with RMPP */
 239                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 240                         if (rmpp_version)
 241                                 goto error1;
 242                 }
 243                 /* Make sure class supplied is consistent with QP type */
 244                 if (qp_type == IB_QPT_SMI) {
 245                         if ((mad_reg_req->mgmt_class !=
 246                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 247                             (mad_reg_req->mgmt_class !=
 248                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 249                                 goto error1;
 250                 } else {
 251                         if ((mad_reg_req->mgmt_class ==
 252                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 253                             (mad_reg_req->mgmt_class ==
 254                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 255                                 goto error1;
 256                 }
 257         } else {
 258                 /* No registration request supplied */
 259                 if (!send_handler)
 260                         goto error1;
 261         }
 262
 263         /* Validate device and port */
 264         port_priv = ib_get_mad_port(device, port_num);
 265         if (!port_priv) {
 266                 ret = ERR_PTR(-ENODEV);
 267                 goto error1;
 268         }
 269
 270         /* Allocate structures */
 271         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 272         if (!mad_agent_priv) {
 273                 ret = ERR_PTR(-ENOMEM);
 274                 goto error1;
 275         }
 276
 277         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 278                                                  IB_ACCESS_LOCAL_WRITE);
 279         if (IS_ERR(mad_agent_priv->agent.mr)) {
 280                 ret = ERR_PTR(-ENOMEM);
 281                 goto error2;
 282         }
 283
 284         if (mad_reg_req) {
 285                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 286                 if (!reg_req) {
 287                         ret = ERR_PTR(-ENOMEM);
 288                         goto error3;
 289                 }
 290                 /* Make a copy of the MAD registration request */
 291                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 292         }
 293
 294         /* Now, fill in the various structures */
 295         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 296         mad_agent_priv->reg_req = reg_req;
 297         mad_agent_priv->agent.rmpp_version = rmpp_version;
 298         mad_agent_priv->agent.device = device;
 299         mad_agent_priv->agent.recv_handler = recv_handler;
 300         mad_agent_priv->agent.send_handler = send_handler;
 301         mad_agent_priv->agent.context = context;
 302         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 303         mad_agent_priv->agent.port_num = port_num;
 304
 305         spin_lock_irqsave(&port_priv->reg_lock, flags);
 306         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 307
 308         /*
 309          * Make sure MAD registration (if supplied)
 310          * is non overlapping with any existing ones
 311          */
 312         if (mad_reg_req) {
 313                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 314                 if (!is_vendor_class(mgmt_class)) {
 315                         class = port_priv->version[mad_reg_req->
 316                                                    mgmt_class_version].class;
 317                         if (class) {
 318                                 method = class->method_table[mgmt_class];
 319                                 if (method) {
 320                                         if (method_in_use(&method,
 321                                                            mad_reg_req))
 322                                                 goto error4;
 323                                 }
 324                         }
 325                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 326                                                   mgmt_class);
 327                 } else {
 328                         /* "New" vendor class range */
 329                         vendor = port_priv->version[mad_reg_req->
 330                                                     mgmt_class_version].vendor;
 331                         if (vendor) {
 332                                 vclass = vendor_class_index(mgmt_class);
 333                                 vendor_class = vendor->vendor_class[vclass];
 334                                 if (vendor_class) {
 335                                         if (is_vendor_method_in_use(
 336                                                         vendor_class,
 337                                                         mad_reg_req))
 338                                                 goto error4;
 339                                 }
 340                         }
 341                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 342                 }
 343                 if (ret2) {
 344                         ret = ERR_PTR(ret2);
 345                         goto error4;
 346                 }
 347         }
 348
 349         /* Add mad agent into port's agent list */
 350         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 351         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 352
 353         spin_lock_init(&mad_agent_priv->lock);
 354         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 355         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 356         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 357         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 358         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 359         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 360         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 361         atomic_set(&mad_agent_priv->refcount, 1);
 362         init_completion(&mad_agent_priv->comp);
 363
 364         return &mad_agent_priv->agent;
 365
 366 error4:
 367         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 368         kfree(reg_req);
 369 error3:
 370         ib_dereg_mr(mad_agent_priv->agent.mr);
 371 error2:
 372         kfree(mad_agent_priv);
 373 error1:
 374         return ret;
 375 }
 376 EXPORT_SYMBOL(ib_register_mad_agent);
 377
 378 static inline int is_snooping_sends(int mad_snoop_flags)
 379 {
 380         return (mad_snoop_flags &
 381                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 382                  IB_MAD_SNOOP_RMPP_SENDS |*/
 383                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 384                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 385 }
 386
 387 static inline int is_snooping_recvs(int mad_snoop_flags)
 388 {
 389         return (mad_snoop_flags &
 390                 (IB_MAD_SNOOP_RECVS /*|
 391                  IB_MAD_SNOOP_RMPP_RECVS*/));
 392 }
 393
 394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 395                                 struct ib_mad_snoop_private *mad_snoop_priv)
 396 {
 397         struct ib_mad_snoop_private **new_snoop_table;
 398         unsigned long flags;
 399         int i;
 400
 401         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 402         /* Check for empty slot in array. */
 403         for (i = 0; i < qp_info->snoop_table_size; i++)
 404                 if (!qp_info->snoop_table[i])
 405                         break;
 406
 407         if (i == qp_info->snoop_table_size) {
 408                 /* Grow table. */
 409                 new_snoop_table = krealloc(qp_info->snoop_table,
 410                                            sizeof mad_snoop_priv *
 411                                            (qp_info->snoop_table_size + 1),
 412                                            GFP_ATOMIC);
 413                 if (!new_snoop_table) {
 414                         i = -ENOMEM;
 415                         goto out;
 416                 }
 417
 418                 qp_info->snoop_table = new_snoop_table;
 419                 qp_info->snoop_table_size++;
 420         }
 421         qp_info->snoop_table[i] = mad_snoop_priv;
 422         atomic_inc(&qp_info->snoop_count);
 423 out:
 424         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 425         return i;
 426 }
 427
 428 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 429                                            u8 port_num,
 430                                            enum ib_qp_type qp_type,
 431                                            int mad_snoop_flags,
 432                                            ib_mad_snoop_handler snoop_handler,
 433                                            ib_mad_recv_handler recv_handler,
 434                                            void *context)
 435 {
 436         struct ib_mad_port_private *port_priv;
 437         struct ib_mad_agent *ret;
 438         struct ib_mad_snoop_private *mad_snoop_priv;
 439         int qpn;
 440
 441         /* Validate parameters */
 442         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 443             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 444                 ret = ERR_PTR(-EINVAL);
 445                 goto error1;
 446         }
 447         qpn = get_spl_qp_index(qp_type);
 448         if (qpn == -1) {
 449                 ret = ERR_PTR(-EINVAL);
 450                 goto error1;
 451         }
 452         port_priv = ib_get_mad_port(device, port_num);
 453         if (!port_priv) {
 454                 ret = ERR_PTR(-ENODEV);
 455                 goto error1;
 456         }
 457         /* Allocate structures */
 458         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 459         if (!mad_snoop_priv) {
 460                 ret = ERR_PTR(-ENOMEM);
 461                 goto error1;
 462         }
 463
 464         /* Now, fill in the various structures */
 465         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 466         mad_snoop_priv->agent.device = device;
 467         mad_snoop_priv->agent.recv_handler = recv_handler;
 468         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 469         mad_snoop_priv->agent.context = context;
 470         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 471         mad_snoop_priv->agent.port_num = port_num;
 472         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 473         init_completion(&mad_snoop_priv->comp);
 474         mad_snoop_priv->snoop_index = register_snoop_agent(
 475                                                 &port_priv->qp_info[qpn],
 476                                                 mad_snoop_priv);
 477         if (mad_snoop_priv->snoop_index < 0) {
 478                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 479                 goto error2;
 480         }
 481
 482         atomic_set(&mad_snoop_priv->refcount, 1);
 483         return &mad_snoop_priv->agent;
 484
 485 error2:
 486         kfree(mad_snoop_priv);
 487 error1:
 488         return ret;
 489 }
 490 EXPORT_SYMBOL(ib_register_mad_snoop);
 491
 492 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 493 {
 494         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 495                 complete(&mad_agent_priv->comp);
 496 }
 497
 498 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 499 {
 500         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 501                 complete(&mad_snoop_priv->comp);
 502 }
 503
 504 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 505 {
 506         struct ib_mad_port_private *port_priv;
 507         unsigned long flags;
 508
 509         /* Note that we could still be handling received MADs */
 510
 511         /*
 512          * Canceling all sends results in dropping received response
 513          * MADs, preventing us from queuing additional work
 514          */
 515         cancel_mads(mad_agent_priv);
 516         port_priv = mad_agent_priv->qp_info->port_priv;
 517         cancel_delayed_work(&mad_agent_priv->timed_work);
 518
 519         spin_lock_irqsave(&port_priv->reg_lock, flags);
 520         remove_mad_reg_req(mad_agent_priv);
 521         list_del(&mad_agent_priv->agent_list);
 522         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 523
 524         flush_workqueue(port_priv->wq);
 525         ib_cancel_rmpp_recvs(mad_agent_priv);
 526
 527         deref_mad_agent(mad_agent_priv);
 528         wait_for_completion(&mad_agent_priv->comp);
 529
 530         kfree(mad_agent_priv->reg_req);
 531         ib_dereg_mr(mad_agent_priv->agent.mr);
 532         kfree(mad_agent_priv);
 533 }
 534
 535 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 536 {
 537         struct ib_mad_qp_info *qp_info;
 538         unsigned long flags;
 539
 540         qp_info = mad_snoop_priv->qp_info;
 541         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 542         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 543         atomic_dec(&qp_info->snoop_count);
 544         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 545
 546         deref_snoop_agent(mad_snoop_priv);
 547         wait_for_completion(&mad_snoop_priv->comp);
 548
 549         kfree(mad_snoop_priv);
 550 }
 551
 552 /*
 553  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 554  */
 555 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 556 {
 557         struct ib_mad_agent_private *mad_agent_priv;
 558         struct ib_mad_snoop_private *mad_snoop_priv;
 559
 560         /* If the TID is zero, the agent can only snoop. */
 561         if (mad_agent->hi_tid) {
 562                 mad_agent_priv = container_of(mad_agent,
 563                                               struct ib_mad_agent_private,
 564                                               agent);
 565                 unregister_mad_agent(mad_agent_priv);
 566         } else {
 567                 mad_snoop_priv = container_of(mad_agent,
 568                                               struct ib_mad_snoop_private,
 569                                               agent);
 570                 unregister_mad_snoop(mad_snoop_priv);
 571         }
 572         return 0;
 573 }
 574 EXPORT_SYMBOL(ib_unregister_mad_agent);
 575
 576 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 577 {
 578         struct ib_mad_queue *mad_queue;
 579         unsigned long flags;
 580
 581         BUG_ON(!mad_list->mad_queue);
 582         mad_queue = mad_list->mad_queue;
 583         spin_lock_irqsave(&mad_queue->lock, flags);
 584         list_del(&mad_list->list);
 585         mad_queue->count--;
 586         spin_unlock_irqrestore(&mad_queue->lock, flags);
 587 }
 588
 589 static void snoop_send(struct ib_mad_qp_info *qp_info,
 590                        struct ib_mad_send_buf *send_buf,
 591                        struct ib_mad_send_wc *mad_send_wc,
 592                        int mad_snoop_flags)
 593 {
 594         struct ib_mad_snoop_private *mad_snoop_priv;
 595         unsigned long flags;
 596         int i;
 597
 598         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 599         for (i = 0; i < qp_info->snoop_table_size; i++) {
 600                 mad_snoop_priv = qp_info->snoop_table[i];
 601                 if (!mad_snoop_priv ||
 602                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 603                         continue;
 604
 605                 atomic_inc(&mad_snoop_priv->refcount);
 606                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 607                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 608                                                     send_buf, mad_send_wc);
 609                 deref_snoop_agent(mad_snoop_priv);
 610                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 611         }
 612         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 613 }
 614
 615 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 616                        struct ib_mad_recv_wc *mad_recv_wc,
 617                        int mad_snoop_flags)
 618 {
 619         struct ib_mad_snoop_private *mad_snoop_priv;
 620         unsigned long flags;
 621         int i;
 622
 623         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 624         for (i = 0; i < qp_info->snoop_table_size; i++) {
 625                 mad_snoop_priv = qp_info->snoop_table[i];
 626                 if (!mad_snoop_priv ||
 627                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 628                         continue;
 629
 630                 atomic_inc(&mad_snoop_priv->refcount);
 631                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 632                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 633                                                    mad_recv_wc);
 634                 deref_snoop_agent(mad_snoop_priv);
 635                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 636         }
 637         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 638 }
 639
 640 static void build_smp_wc(struct ib_qp *qp,
 641                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 642                          struct ib_wc *wc)
 643 {
 644         memset(wc, 0, sizeof *wc);
 645         wc->wr_id = wr_id;
 646         wc->status = IB_WC_SUCCESS;
 647         wc->opcode = IB_WC_RECV;
 648         wc->pkey_index = pkey_index;
 649         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 650         wc->src_qp = IB_QP0;
 651         wc->qp = qp;
 652         wc->slid = slid;
 653         wc->sl = 0;
 654         wc->dlid_path_bits = 0;
 655         wc->port_num = port_num;
 656 }
 657
 658 /*
 659  * Return 0 if SMP is to be sent
 660  * Return 1 if SMP was consumed locally (whether or not solicited)
 661  * Return < 0 if error
 662  */
 663 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 664                                   struct ib_mad_send_wr_private *mad_send_wr)
 665 {
 666         int ret = 0;
 667         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 668         unsigned long flags;
 669         struct ib_mad_local_private *local;
 670         struct ib_mad_private *mad_priv;
 671         struct ib_mad_port_private *port_priv;
 672         struct ib_mad_agent_private *recv_mad_agent = NULL;
 673         struct ib_device *device = mad_agent_priv->agent.device;
 674         u8 port_num;
 675         struct ib_wc mad_wc;
 676         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 677
 678         if (device->node_type == RDMA_NODE_IB_SWITCH &&
 679             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 680                 port_num = send_wr->wr.ud.port_num;
 681         else
 682                 port_num = mad_agent_priv->agent.port_num;
 683
 684         /*
 685          * Directed route handling starts if the initial LID routed part of
 686          * a request or the ending LID routed part of a response is empty.
 687          * If we are at the start of the LID routed part, don't update the
 688          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 689          */
 690         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 691              IB_LID_PERMISSIVE &&
 692              smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
 693              IB_SMI_DISCARD) {
 694                 ret = -EINVAL;
 695                 printk(KERN_ERR PFX "Invalid directed route\n");
 696                 goto out;
 697         }
 698
 699         /* Check to post send on QP or process locally */
 700         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 701             smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 702                 goto out;
 703
 704         local = kmalloc(sizeof *local, GFP_ATOMIC);
 705         if (!local) {
 706                 ret = -ENOMEM;
 707                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 708                 goto out;
 709         }
 710         local->mad_priv = NULL;
 711         local->recv_mad_agent = NULL;
 712         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 713         if (!mad_priv) {
 714                 ret = -ENOMEM;
 715                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 716                 kfree(local);
 717                 goto out;
 718         }
 719
 720         build_smp_wc(mad_agent_priv->agent.qp,
 721                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 722                      send_wr->wr.ud.pkey_index,
 723                      send_wr->wr.ud.port_num, &mad_wc);
 724
 725         /* No GRH for DR SMP */
 726         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 727                                   (struct ib_mad *)smp,
 728                                   (struct ib_mad *)&mad_priv->mad);
 729         switch (ret)
 730         {
 731         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 732                 if (ib_response_mad(&mad_priv->mad.mad) &&
 733                     mad_agent_priv->agent.recv_handler) {
 734                         local->mad_priv = mad_priv;
 735                         local->recv_mad_agent = mad_agent_priv;
 736                         /*
 737                          * Reference MAD agent until receive
 738                          * side of local completion handled
 739                          */
 740                         atomic_inc(&mad_agent_priv->refcount);
 741                 } else
 742                         kmem_cache_free(ib_mad_cache, mad_priv);
 743                 break;
 744         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 745                 kmem_cache_free(ib_mad_cache, mad_priv);
 746                 kfree(local);
 747                 ret = 1;
 748                 goto out;
 749         case IB_MAD_RESULT_SUCCESS:
 750                 /* Treat like an incoming receive MAD */
 751                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 752                                             mad_agent_priv->agent.port_num);
 753                 if (port_priv) {
 754                         memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
 755                         recv_mad_agent = find_mad_agent(port_priv,
 756                                                         &mad_priv->mad.mad);
 757                 }
 758                 if (!port_priv || !recv_mad_agent) {
 759                         kmem_cache_free(ib_mad_cache, mad_priv);
 760                         kfree(local);
 761                         ret = 0;
 762                         goto out;
 763                 }
 764                 local->mad_priv = mad_priv;
 765                 local->recv_mad_agent = recv_mad_agent;
 766                 break;
 767         default:
 768                 kmem_cache_free(ib_mad_cache, mad_priv);
 769                 kfree(local);
 770                 ret = -EINVAL;
 771                 goto out;
 772         }
 773
 774         local->mad_send_wr = mad_send_wr;
 775         /* Reference MAD agent until send side of local completion handled */
 776         atomic_inc(&mad_agent_priv->refcount);
 777         /* Queue local completion to local list */
 778         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 779         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 780         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 781         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 782                    &mad_agent_priv->local_work);
 783         ret = 1;
 784 out:
 785         return ret;
 786 }
 787
 788 static int get_pad_size(int hdr_len, int data_len)
 789 {
 790         int seg_size, pad;
 791
 792         seg_size = sizeof(struct ib_mad) - hdr_len;
 793         if (data_len && seg_size) {
 794                 pad = seg_size - data_len % seg_size;
 795                 return pad == seg_size ? 0 : pad;
 796         } else
 797                 return seg_size;
 798 }
 799
 800 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 801 {
 802         struct ib_rmpp_segment *s, *t;
 803
 804         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 805                 list_del(&s->list);
 806                 kfree(s);
 807         }
 808 }
 809
 810 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 811                                 gfp_t gfp_mask)
 812 {
 813         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 814         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 815         struct ib_rmpp_segment *seg = NULL;
 816         int left, seg_size, pad;
 817
 818         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 819         seg_size = send_buf->seg_size;
 820         pad = send_wr->pad;
 821
 822         /* Allocate data segments. */
 823         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 824                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 825                 if (!seg) {
 826                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 827                                "alloc failed for len %zd, gfp %#x\n",
 828                                sizeof (*seg) + seg_size, gfp_mask);
 829                         free_send_rmpp_list(send_wr);
 830                         return -ENOMEM;
 831                 }
 832                 seg->num = ++send_buf->seg_count;
 833                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 834         }
 835
 836         /* Zero any padding */
 837         if (pad)
 838                 memset(seg->data + seg_size - pad, 0, pad);
 839
 840         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 841                                           agent.rmpp_version;
 842         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 843         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 844
 845         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 846                                         struct ib_rmpp_segment, list);
 847         send_wr->last_ack_seg = send_wr->cur_seg;
 848         return 0;
 849 }
 850
 851 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 852                                             u32 remote_qpn, u16 pkey_index,
 853                                             int rmpp_active,
 854                                             int hdr_len, int data_len,
 855                                             gfp_t gfp_mask)
 856 {
 857         struct ib_mad_agent_private *mad_agent_priv;
 858         struct ib_mad_send_wr_private *mad_send_wr;
 859         int pad, message_size, ret, size;
 860         void *buf;
 861
 862         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 863                                       agent);
 864         pad = get_pad_size(hdr_len, data_len);
 865         message_size = hdr_len + data_len + pad;
 866
 867         if ((!mad_agent->rmpp_version &&
 868              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 869             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 870                 return ERR_PTR(-EINVAL);
 871
 872         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 873         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 874         if (!buf)
 875                 return ERR_PTR(-ENOMEM);
 876
 877         mad_send_wr = buf + size;
 878         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 879         mad_send_wr->send_buf.mad = buf;
 880         mad_send_wr->send_buf.hdr_len = hdr_len;
 881         mad_send_wr->send_buf.data_len = data_len;
 882         mad_send_wr->pad = pad;
 883
 884         mad_send_wr->mad_agent_priv = mad_agent_priv;
 885         mad_send_wr->sg_list[0].length = hdr_len;
 886         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 887         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 888         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 889
 890         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 891         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 892         mad_send_wr->send_wr.num_sge = 2;
 893         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 894         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 895         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 896         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 897         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 898
 899         if (rmpp_active) {
 900                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 901                 if (ret) {
 902                         kfree(buf);
 903                         return ERR_PTR(ret);
 904                 }
 905         }
 906
 907         mad_send_wr->send_buf.mad_agent = mad_agent;
 908         atomic_inc(&mad_agent_priv->refcount);
 909         return &mad_send_wr->send_buf;
 910 }
 911 EXPORT_SYMBOL(ib_create_send_mad);
 912
 913 int ib_get_mad_data_offset(u8 mgmt_class)
 914 {
 915         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 916                 return IB_MGMT_SA_HDR;
 917         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 918                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 919                  (mgmt_class == IB_MGMT_CLASS_BIS))
 920                 return IB_MGMT_DEVICE_HDR;
 921         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 922                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 923                 return IB_MGMT_VENDOR_HDR;
 924         else
 925                 return IB_MGMT_MAD_HDR;
 926 }
 927 EXPORT_SYMBOL(ib_get_mad_data_offset);
 928
 929 int ib_is_mad_class_rmpp(u8 mgmt_class)
 930 {
 931         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 932             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 933             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 934             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 935             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 936              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 937                 return 1;
 938         return 0;
 939 }
 940 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 941
 942 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 943 {
 944         struct ib_mad_send_wr_private *mad_send_wr;
 945         struct list_head *list;
 946
 947         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 948                                    send_buf);
 949         list = &mad_send_wr->cur_seg->list;
 950
 951         if (mad_send_wr->cur_seg->num < seg_num) {
 952                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 953                         if (mad_send_wr->cur_seg->num == seg_num)
 954                                 break;
 955         } else if (mad_send_wr->cur_seg->num > seg_num) {
 956                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 957                         if (mad_send_wr->cur_seg->num == seg_num)
 958                                 break;
 959         }
 960         return mad_send_wr->cur_seg->data;
 961 }
 962 EXPORT_SYMBOL(ib_get_rmpp_segment);
 963
 964 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 965 {
 966         if (mad_send_wr->send_buf.seg_count)
 967                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 968                                            mad_send_wr->seg_num);
 969         else
 970                 return mad_send_wr->send_buf.mad +
 971                        mad_send_wr->send_buf.hdr_len;
 972 }
 973
 974 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 975 {
 976         struct ib_mad_agent_private *mad_agent_priv;
 977         struct ib_mad_send_wr_private *mad_send_wr;
 978
 979         mad_agent_priv = container_of(send_buf->mad_agent,
 980                                       struct ib_mad_agent_private, agent);
 981         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 982                                    send_buf);
 983
 984         free_send_rmpp_list(mad_send_wr);
 985         kfree(send_buf->mad);
 986         deref_mad_agent(mad_agent_priv);
 987 }
 988 EXPORT_SYMBOL(ib_free_send_mad);
 989
 990 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 991 {
 992         struct ib_mad_qp_info *qp_info;
 993         struct list_head *list;
 994         struct ib_send_wr *bad_send_wr;
 995         struct ib_mad_agent *mad_agent;
 996         struct ib_sge *sge;
 997         unsigned long flags;
 998         int ret;
 999
1000         /* Set WR ID to find mad_send_wr upon completion */
1001         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1002         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1003         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1004
1005         mad_agent = mad_send_wr->send_buf.mad_agent;
1006         sge = mad_send_wr->sg_list;
1007         sge[0].addr = ib_dma_map_single(mad_agent->device,
1008                                         mad_send_wr->send_buf.mad,
1009                                         sge[0].length,
1010                                         DMA_TO_DEVICE);
1011         mad_send_wr->header_mapping = sge[0].addr;
1012
1013         sge[1].addr = ib_dma_map_single(mad_agent->device,
1014                                         ib_get_payload(mad_send_wr),
1015                                         sge[1].length,
1016                                         DMA_TO_DEVICE);
1017         mad_send_wr->payload_mapping = sge[1].addr;
1018
1019         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1020         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1021                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1022                                    &bad_send_wr);
1023                 list = &qp_info->send_queue.list;
1024         } else {
1025                 ret = 0;
1026                 list = &qp_info->overflow_list;
1027         }
1028
1029         if (!ret) {
1030                 qp_info->send_queue.count++;
1031                 list_add_tail(&mad_send_wr->mad_list.list, list);
1032         }
1033         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1034         if (ret) {
1035                 ib_dma_unmap_single(mad_agent->device,
1036                                     mad_send_wr->header_mapping,
1037                                     sge[0].length, DMA_TO_DEVICE);
1038                 ib_dma_unmap_single(mad_agent->device,
1039                                     mad_send_wr->payload_mapping,
1040                                     sge[1].length, DMA_TO_DEVICE);
1041         }
1042         return ret;
1043 }
1044
1045 /*
1046  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1047  *  with the registered client
1048  */
1049 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1050                      struct ib_mad_send_buf **bad_send_buf)
1051 {
1052         struct ib_mad_agent_private *mad_agent_priv;
1053         struct ib_mad_send_buf *next_send_buf;
1054         struct ib_mad_send_wr_private *mad_send_wr;
1055         unsigned long flags;
1056         int ret = -EINVAL;
1057
1058         /* Walk list of send WRs and post each on send list */
1059         for (; send_buf; send_buf = next_send_buf) {
1060
1061                 mad_send_wr = container_of(send_buf,
1062                                            struct ib_mad_send_wr_private,
1063                                            send_buf);
1064                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1065
1066                 if (!send_buf->mad_agent->send_handler ||
1067                     (send_buf->timeout_ms &&
1068                      !send_buf->mad_agent->recv_handler)) {
1069                         ret = -EINVAL;
1070                         goto error;
1071                 }
1072
1073                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1074                         if (mad_agent_priv->agent.rmpp_version) {
1075                                 ret = -EINVAL;
1076                                 goto error;
1077                         }
1078                 }
1079
1080                 /*
1081                  * Save pointer to next work request to post in case the
1082                  * current one completes, and the user modifies the work
1083                  * request associated with the completion
1084                  */
1085                 next_send_buf = send_buf->next;
1086                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1087
1088                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1089                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1090                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1091                                                      mad_send_wr);
1092                         if (ret < 0)            /* error */
1093                                 goto error;
1094                         else if (ret == 1)      /* locally consumed */
1095                                 continue;
1096                 }
1097
1098                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1099                 /* Timeout will be updated after send completes */
1100                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1101                 mad_send_wr->max_retries = send_buf->retries;
1102                 mad_send_wr->retries_left = send_buf->retries;
1103                 send_buf->retries = 0;
1104                 /* Reference for work request to QP + response */
1105                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1106                 mad_send_wr->status = IB_WC_SUCCESS;
1107
1108                 /* Reference MAD agent until send completes */
1109                 atomic_inc(&mad_agent_priv->refcount);
1110                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1111                 list_add_tail(&mad_send_wr->agent_list,
1112                               &mad_agent_priv->send_list);
1113                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1114
1115                 if (mad_agent_priv->agent.rmpp_version) {
1116                         ret = ib_send_rmpp_mad(mad_send_wr);
1117                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1118                                 ret = ib_send_mad(mad_send_wr);
1119                 } else
1120                         ret = ib_send_mad(mad_send_wr);
1121                 if (ret < 0) {
1122                         /* Fail send request */
1123                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1124                         list_del(&mad_send_wr->agent_list);
1125                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1126                         atomic_dec(&mad_agent_priv->refcount);
1127                         goto error;
1128                 }
1129         }
1130         return 0;
1131 error:
1132         if (bad_send_buf)
1133                 *bad_send_buf = send_buf;
1134         return ret;
1135 }
1136 EXPORT_SYMBOL(ib_post_send_mad);
1137
1138 /*
1139  * ib_free_recv_mad - Returns data buffers used to receive
1140  *  a MAD to the access layer
1141  */
1142 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1143 {
1144         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1145         struct ib_mad_private_header *mad_priv_hdr;
1146         struct ib_mad_private *priv;
1147         struct list_head free_list;
1148
1149         INIT_LIST_HEAD(&free_list);
1150         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1151
1152         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1153                                         &free_list, list) {
1154                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1155                                            recv_buf);
1156                 mad_priv_hdr = container_of(mad_recv_wc,
1157                                             struct ib_mad_private_header,
1158                                             recv_wc);
1159                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1160                                     header);
1161                 kmem_cache_free(ib_mad_cache, priv);
1162         }
1163 }
1164 EXPORT_SYMBOL(ib_free_recv_mad);
1165
1166 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1167                                         u8 rmpp_version,
1168                                         ib_mad_send_handler send_handler,
1169                                         ib_mad_recv_handler recv_handler,
1170                                         void *context)
1171 {
1172         return ERR_PTR(-EINVAL);        /* XXX: for now */
1173 }
1174 EXPORT_SYMBOL(ib_redirect_mad_qp);
1175
1176 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1177                       struct ib_wc *wc)
1178 {
1179         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1180         return 0;
1181 }
1182 EXPORT_SYMBOL(ib_process_mad_wc);
1183
1184 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1185                          struct ib_mad_reg_req *mad_reg_req)
1186 {
1187         int i;
1188
1189         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1190              i < IB_MGMT_MAX_METHODS;
1191              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1192                                1+i)) {
1193                 if ((*method)->agent[i]) {
1194                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1195                         return -EINVAL;
1196                 }
1197         }
1198         return 0;
1199 }
1200
1201 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1202 {
1203         /* Allocate management method table */
1204         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1205         if (!*method) {
1206                 printk(KERN_ERR PFX "No memory for "
1207                        "ib_mad_mgmt_method_table\n");
1208                 return -ENOMEM;
1209         }
1210
1211         return 0;
1212 }
1213
1214 /*
1215  * Check to see if there are any methods still in use
1216  */
1217 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1218 {
1219         int i;
1220
1221         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1222                 if (method->agent[i])
1223                         return 1;
1224         return 0;
1225 }
1226
1227 /*
1228  * Check to see if there are any method tables for this class still in use
1229  */
1230 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1231 {
1232         int i;
1233
1234         for (i = 0; i < MAX_MGMT_CLASS; i++)
1235                 if (class->method_table[i])
1236                         return 1;
1237         return 0;
1238 }
1239
1240 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1241 {
1242         int i;
1243
1244         for (i = 0; i < MAX_MGMT_OUI; i++)
1245                 if (vendor_class->method_table[i])
1246                         return 1;
1247         return 0;
1248 }
1249
1250 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1251                            char *oui)
1252 {
1253         int i;
1254
1255         for (i = 0; i < MAX_MGMT_OUI; i++)
1256                 /* Is there matching OUI for this vendor class ? */
1257                 if (!memcmp(vendor_class->oui[i], oui, 3))
1258                         return i;
1259
1260         return -1;
1261 }
1262
1263 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1264 {
1265         int i;
1266
1267         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1268                 if (vendor->vendor_class[i])
1269                         return 1;
1270
1271         return 0;
1272 }
1273
1274 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1275                                      struct ib_mad_agent_private *agent)
1276 {
1277         int i;
1278
1279         /* Remove any methods for this mad agent */
1280         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1281                 if (method->agent[i] == agent) {
1282                         method->agent[i] = NULL;
1283                 }
1284         }
1285 }
1286
1287 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1288                               struct ib_mad_agent_private *agent_priv,
1289                               u8 mgmt_class)
1290 {
1291         struct ib_mad_port_private *port_priv;
1292         struct ib_mad_mgmt_class_table **class;
1293         struct ib_mad_mgmt_method_table **method;
1294         int i, ret;
1295
1296         port_priv = agent_priv->qp_info->port_priv;
1297         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1298         if (!*class) {
1299                 /* Allocate management class table for "new" class version */
1300                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1301                 if (!*class) {
1302                         printk(KERN_ERR PFX "No memory for "
1303                                "ib_mad_mgmt_class_table\n");
1304                         ret = -ENOMEM;
1305                         goto error1;
1306                 }
1307
1308                 /* Allocate method table for this management class */
1309                 method = &(*class)->method_table[mgmt_class];
1310                 if ((ret = allocate_method_table(method)))
1311                         goto error2;
1312         } else {
1313                 method = &(*class)->method_table[mgmt_class];
1314                 if (!*method) {
1315                         /* Allocate method table for this management class */
1316                         if ((ret = allocate_method_table(method)))
1317                                 goto error1;
1318                 }
1319         }
1320
1321         /* Now, make sure methods are not already in use */
1322         if (method_in_use(method, mad_reg_req))
1323                 goto error3;
1324
1325         /* Finally, add in methods being registered */
1326         for (i = find_first_bit(mad_reg_req->method_mask,
1327                                 IB_MGMT_MAX_METHODS);
1328              i < IB_MGMT_MAX_METHODS;
1329              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1330                                1+i)) {
1331                 (*method)->agent[i] = agent_priv;
1332         }
1333         return 0;
1334
1335 error3:
1336         /* Remove any methods for this mad agent */
1337         remove_methods_mad_agent(*method, agent_priv);
1338         /* Now, check to see if there are any methods in use */
1339         if (!check_method_table(*method)) {
1340                 /* If not, release management method table */
1341                 kfree(*method);
1342                 *method = NULL;
1343         }
1344         ret = -EINVAL;
1345         goto error1;
1346 error2:
1347         kfree(*class);
1348         *class = NULL;
1349 error1:
1350         return ret;
1351 }
1352
1353 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1354                            struct ib_mad_agent_private *agent_priv)
1355 {
1356         struct ib_mad_port_private *port_priv;
1357         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1358         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1359         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1360         struct ib_mad_mgmt_method_table **method;
1361         int i, ret = -ENOMEM;
1362         u8 vclass;
1363
1364         /* "New" vendor (with OUI) class */
1365         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1366         port_priv = agent_priv->qp_info->port_priv;
1367         vendor_table = &port_priv->version[
1368                                 mad_reg_req->mgmt_class_version].vendor;
1369         if (!*vendor_table) {
1370                 /* Allocate mgmt vendor class table for "new" class version */
1371                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1372                 if (!vendor) {
1373                         printk(KERN_ERR PFX "No memory for "
1374                                "ib_mad_mgmt_vendor_class_table\n");
1375                         goto error1;
1376                 }
1377
1378                 *vendor_table = vendor;
1379         }
1380         if (!(*vendor_table)->vendor_class[vclass]) {
1381                 /* Allocate table for this management vendor class */
1382                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1383                 if (!vendor_class) {
1384                         printk(KERN_ERR PFX "No memory for "
1385                                "ib_mad_mgmt_vendor_class\n");
1386                         goto error2;
1387                 }
1388
1389                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1390         }
1391         for (i = 0; i < MAX_MGMT_OUI; i++) {
1392                 /* Is there matching OUI for this vendor class ? */
1393                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1394                             mad_reg_req->oui, 3)) {
1395                         method = &(*vendor_table)->vendor_class[
1396                                                 vclass]->method_table[i];
1397                         BUG_ON(!*method);
1398                         goto check_in_use;
1399                 }
1400         }
1401         for (i = 0; i < MAX_MGMT_OUI; i++) {
1402                 /* OUI slot available ? */
1403                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1404                                 vclass]->oui[i])) {
1405                         method = &(*vendor_table)->vendor_class[
1406                                 vclass]->method_table[i];
1407                         BUG_ON(*method);
1408                         /* Allocate method table for this OUI */
1409                         if ((ret = allocate_method_table(method)))
1410                                 goto error3;
1411                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1412                                mad_reg_req->oui, 3);
1413                         goto check_in_use;
1414                 }
1415         }
1416         printk(KERN_ERR PFX "All OUI slots in use\n");
1417         goto error3;
1418
1419 check_in_use:
1420         /* Now, make sure methods are not already in use */
1421         if (method_in_use(method, mad_reg_req))
1422                 goto error4;
1423
1424         /* Finally, add in methods being registered */
1425         for (i = find_first_bit(mad_reg_req->method_mask,
1426                                 IB_MGMT_MAX_METHODS);
1427              i < IB_MGMT_MAX_METHODS;
1428              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1429                                1+i)) {
1430                 (*method)->agent[i] = agent_priv;
1431         }
1432         return 0;
1433
1434 error4:
1435         /* Remove any methods for this mad agent */
1436         remove_methods_mad_agent(*method, agent_priv);
1437         /* Now, check to see if there are any methods in use */
1438         if (!check_method_table(*method)) {
1439                 /* If not, release management method table */
1440                 kfree(*method);
1441                 *method = NULL;
1442         }
1443         ret = -EINVAL;
1444 error3:
1445         if (vendor_class) {
1446                 (*vendor_table)->vendor_class[vclass] = NULL;
1447                 kfree(vendor_class);
1448         }
1449 error2:
1450         if (vendor) {
1451                 *vendor_table = NULL;
1452                 kfree(vendor);
1453         }
1454 error1:
1455         return ret;
1456 }
1457
1458 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1459 {
1460         struct ib_mad_port_private *port_priv;
1461         struct ib_mad_mgmt_class_table *class;
1462         struct ib_mad_mgmt_method_table *method;
1463         struct ib_mad_mgmt_vendor_class_table *vendor;
1464         struct ib_mad_mgmt_vendor_class *vendor_class;
1465         int index;
1466         u8 mgmt_class;
1467
1468         /*
1469          * Was MAD registration request supplied
1470          * with original registration ?
1471          */
1472         if (!agent_priv->reg_req) {
1473                 goto out;
1474         }
1475
1476         port_priv = agent_priv->qp_info->port_priv;
1477         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1478         class = port_priv->version[
1479                         agent_priv->reg_req->mgmt_class_version].class;
1480         if (!class)
1481                 goto vendor_check;
1482
1483         method = class->method_table[mgmt_class];
1484         if (method) {
1485                 /* Remove any methods for this mad agent */
1486                 remove_methods_mad_agent(method, agent_priv);
1487                 /* Now, check to see if there are any methods still in use */
1488                 if (!check_method_table(method)) {
1489                         /* If not, release management method table */
1490                          kfree(method);
1491                          class->method_table[mgmt_class] = NULL;
1492                          /* Any management classes left ? */
1493                         if (!check_class_table(class)) {
1494                                 /* If not, release management class table */
1495                                 kfree(class);
1496                                 port_priv->version[
1497                                         agent_priv->reg_req->
1498                                         mgmt_class_version].class = NULL;
1499                         }
1500                 }
1501         }
1502
1503 vendor_check:
1504         if (!is_vendor_class(mgmt_class))
1505                 goto out;
1506
1507         /* normalize mgmt_class to vendor range 2 */
1508         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1509         vendor = port_priv->version[
1510                         agent_priv->reg_req->mgmt_class_version].vendor;
1511
1512         if (!vendor)
1513                 goto out;
1514
1515         vendor_class = vendor->vendor_class[mgmt_class];
1516         if (vendor_class) {
1517                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1518                 if (index < 0)
1519                         goto out;
1520                 method = vendor_class->method_table[index];
1521                 if (method) {
1522                         /* Remove any methods for this mad agent */
1523                         remove_methods_mad_agent(method, agent_priv);
1524                         /*
1525                          * Now, check to see if there are
1526                          * any methods still in use
1527                          */
1528                         if (!check_method_table(method)) {
1529                                 /* If not, release management method table */
1530                                 kfree(method);
1531                                 vendor_class->method_table[index] = NULL;
1532                                 memset(vendor_class->oui[index], 0, 3);
1533                                 /* Any OUIs left ? */
1534                                 if (!check_vendor_class(vendor_class)) {
1535                                         /* If not, release vendor class table */
1536                                         kfree(vendor_class);
1537                                         vendor->vendor_class[mgmt_class] = NULL;
1538                                         /* Any other vendor classes left ? */
1539                                         if (!check_vendor_table(vendor)) {
1540                                                 kfree(vendor);
1541                                                 port_priv->version[
1542                                                         agent_priv->reg_req->
1543                                                         mgmt_class_version].
1544                                                         vendor = NULL;
1545                                         }
1546                                 }
1547                         }
1548                 }
1549         }
1550
1551 out:
1552         return;
1553 }
1554
1555 static struct ib_mad_agent_private *
1556 find_mad_agent(struct ib_mad_port_private *port_priv,
1557                struct ib_mad *mad)
1558 {
1559         struct ib_mad_agent_private *mad_agent = NULL;
1560         unsigned long flags;
1561
1562         spin_lock_irqsave(&port_priv->reg_lock, flags);
1563         if (ib_response_mad(mad)) {
1564                 u32 hi_tid;
1565                 struct ib_mad_agent_private *entry;
1566
1567                 /*
1568                  * Routing is based on high 32 bits of transaction ID
1569                  * of MAD.
1570                  */
1571                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1572                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1573                         if (entry->agent.hi_tid == hi_tid) {
1574                                 mad_agent = entry;
1575                                 break;
1576                         }
1577                 }
1578         } else {
1579                 struct ib_mad_mgmt_class_table *class;
1580                 struct ib_mad_mgmt_method_table *method;
1581                 struct ib_mad_mgmt_vendor_class_table *vendor;
1582                 struct ib_mad_mgmt_vendor_class *vendor_class;
1583                 struct ib_vendor_mad *vendor_mad;
1584                 int index;
1585
1586                 /*
1587                  * Routing is based on version, class, and method
1588                  * For "newer" vendor MADs, also based on OUI
1589                  */
1590                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1591                         goto out;
1592                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1593                         class = port_priv->version[
1594                                         mad->mad_hdr.class_version].class;
1595                         if (!class)
1596                                 goto out;
1597                         method = class->method_table[convert_mgmt_class(
1598                                                         mad->mad_hdr.mgmt_class)];
1599                         if (method)
1600                                 mad_agent = method->agent[mad->mad_hdr.method &
1601                                                           ~IB_MGMT_METHOD_RESP];
1602                 } else {
1603                         vendor = port_priv->version[
1604                                         mad->mad_hdr.class_version].vendor;
1605                         if (!vendor)
1606                                 goto out;
1607                         vendor_class = vendor->vendor_class[vendor_class_index(
1608                                                 mad->mad_hdr.mgmt_class)];
1609                         if (!vendor_class)
1610                                 goto out;
1611                         /* Find matching OUI */
1612                         vendor_mad = (struct ib_vendor_mad *)mad;
1613                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1614                         if (index == -1)
1615                                 goto out;
1616                         method = vendor_class->method_table[index];
1617                         if (method) {
1618                                 mad_agent = method->agent[mad->mad_hdr.method &
1619                                                           ~IB_MGMT_METHOD_RESP];
1620                         }
1621                 }
1622         }
1623
1624         if (mad_agent) {
1625                 if (mad_agent->agent.recv_handler)
1626                         atomic_inc(&mad_agent->refcount);
1627                 else {
1628                         printk(KERN_NOTICE PFX "No receive handler for client "
1629                                "%p on port %d\n",
1630                                &mad_agent->agent, port_priv->port_num);
1631                         mad_agent = NULL;
1632                 }
1633         }
1634 out:
1635         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1636
1637         return mad_agent;
1638 }
1639
1640 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1641 {
1642         int valid = 0;
1643
1644         /* Make sure MAD base version is understood */
1645         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1646                 printk(KERN_ERR PFX "MAD received with unsupported base "
1647                        "version %d\n", mad->mad_hdr.base_version);
1648                 goto out;
1649         }
1650
1651         /* Filter SMI packets sent to other than QP0 */
1652         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1653             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1654                 if (qp_num == 0)
1655                         valid = 1;
1656         } else {
1657                 /* Filter GSI packets sent to QP0 */
1658                 if (qp_num != 0)
1659                         valid = 1;
1660         }
1661
1662 out:
1663         return valid;
1664 }
1665
1666 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1667                        struct ib_mad_hdr *mad_hdr)
1668 {
1669         struct ib_rmpp_mad *rmpp_mad;
1670
1671         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1672         return !mad_agent_priv->agent.rmpp_version ||
1673                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1674                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1675                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1676 }
1677
1678 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1679                                      struct ib_mad_recv_wc *rwc)
1680 {
1681         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1682                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1683 }
1684
1685 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1686                                    struct ib_mad_send_wr_private *wr,
1687                                    struct ib_mad_recv_wc *rwc )
1688 {
1689         struct ib_ah_attr attr;
1690         u8 send_resp, rcv_resp;
1691         union ib_gid sgid;
1692         struct ib_device *device = mad_agent_priv->agent.device;
1693         u8 port_num = mad_agent_priv->agent.port_num;
1694         u8 lmc;
1695
1696         send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1697         rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1698
1699         if (send_resp == rcv_resp)
1700                 /* both requests, or both responses. GIDs different */
1701                 return 0;
1702
1703         if (ib_query_ah(wr->send_buf.ah, &attr))
1704                 /* Assume not equal, to avoid false positives. */
1705                 return 0;
1706
1707         if (!!(attr.ah_flags & IB_AH_GRH) !=
1708             !!(rwc->wc->wc_flags & IB_WC_GRH))
1709                 /* one has GID, other does not.  Assume different */
1710                 return 0;
1711
1712         if (!send_resp && rcv_resp) {
1713                 /* is request/response. */
1714                 if (!(attr.ah_flags & IB_AH_GRH)) {
1715                         if (ib_get_cached_lmc(device, port_num, &lmc))
1716                                 return 0;
1717                         return (!lmc || !((attr.src_path_bits ^
1718                                            rwc->wc->dlid_path_bits) &
1719                                           ((1 << lmc) - 1)));
1720                 } else {
1721                         if (ib_get_cached_gid(device, port_num,
1722                                               attr.grh.sgid_index, &sgid))
1723                                 return 0;
1724                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1725                                        16);
1726                 }
1727         }
1728
1729         if (!(attr.ah_flags & IB_AH_GRH))
1730                 return attr.dlid == rwc->wc->slid;
1731         else
1732                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1733                                16);
1734 }
1735
1736 static inline int is_direct(u8 class)
1737 {
1738         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1739 }
1740
1741 struct ib_mad_send_wr_private*
1742 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1743                  struct ib_mad_recv_wc *wc)
1744 {
1745         struct ib_mad_send_wr_private *wr;
1746         struct ib_mad *mad;
1747
1748         mad = (struct ib_mad *)wc->recv_buf.mad;
1749
1750         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1751                 if ((wr->tid == mad->mad_hdr.tid) &&
1752                     rcv_has_same_class(wr, wc) &&
1753                     /*
1754                      * Don't check GID for direct routed MADs.
1755                      * These might have permissive LIDs.
1756                      */
1757                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1758                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1759                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1760         }
1761
1762         /*
1763          * It's possible to receive the response before we've
1764          * been notified that the send has completed
1765          */
1766         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1767                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1768                     wr->tid == mad->mad_hdr.tid &&
1769                     wr->timeout &&
1770                     rcv_has_same_class(wr, wc) &&
1771                     /*
1772                      * Don't check GID for direct routed MADs.
1773                      * These might have permissive LIDs.
1774                      */
1775                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1776                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1777                         /* Verify request has not been canceled */
1778                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1779         }
1780         return NULL;
1781 }
1782
1783 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1784 {
1785         mad_send_wr->timeout = 0;
1786         if (mad_send_wr->refcount == 1)
1787                 list_move_tail(&mad_send_wr->agent_list,
1788                               &mad_send_wr->mad_agent_priv->done_list);
1789 }
1790
1791 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1792                                  struct ib_mad_recv_wc *mad_recv_wc)
1793 {
1794         struct ib_mad_send_wr_private *mad_send_wr;
1795         struct ib_mad_send_wc mad_send_wc;
1796         unsigned long flags;
1797
1798         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1799         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1800         if (mad_agent_priv->agent.rmpp_version) {
1801                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1802                                                       mad_recv_wc);
1803                 if (!mad_recv_wc) {
1804                         deref_mad_agent(mad_agent_priv);
1805                         return;
1806                 }
1807         }
1808
1809         /* Complete corresponding request */
1810         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1811                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1812                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1813                 if (!mad_send_wr) {
1814                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1815                         ib_free_recv_mad(mad_recv_wc);
1816                         deref_mad_agent(mad_agent_priv);
1817                         return;
1818                 }
1819                 ib_mark_mad_done(mad_send_wr);
1820                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1821
1822                 /* Defined behavior is to complete response before request */
1823                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1824                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1825                                                    mad_recv_wc);
1826                 atomic_dec(&mad_agent_priv->refcount);
1827
1828                 mad_send_wc.status = IB_WC_SUCCESS;
1829                 mad_send_wc.vendor_err = 0;
1830                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1831                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1832         } else {
1833                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1834                                                    mad_recv_wc);
1835                 deref_mad_agent(mad_agent_priv);
1836         }
1837 }
1838
1839 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1840                                      struct ib_wc *wc)
1841 {
1842         struct ib_mad_qp_info *qp_info;
1843         struct ib_mad_private_header *mad_priv_hdr;
1844         struct ib_mad_private *recv, *response = NULL;
1845         struct ib_mad_list_head *mad_list;
1846         struct ib_mad_agent_private *mad_agent;
1847         int port_num;
1848
1849         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1850         qp_info = mad_list->mad_queue->qp_info;
1851         dequeue_mad(mad_list);
1852
1853         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1854                                     mad_list);
1855         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1856         ib_dma_unmap_single(port_priv->device,
1857                             recv->header.mapping,
1858                             sizeof(struct ib_mad_private) -
1859                               sizeof(struct ib_mad_private_header),
1860                             DMA_FROM_DEVICE);
1861
1862         /* Setup MAD receive work completion from "normal" work completion */
1863         recv->header.wc = *wc;
1864         recv->header.recv_wc.wc = &recv->header.wc;
1865         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1866         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1867         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1868
1869         if (atomic_read(&qp_info->snoop_count))
1870                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1871
1872         /* Validate MAD */
1873         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1874                 goto out;
1875
1876         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1877         if (!response) {
1878                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1879                        "for response buffer\n");
1880                 goto out;
1881         }
1882
1883         if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1884                 port_num = wc->port_num;
1885         else
1886                 port_num = port_priv->port_num;
1887
1888         if (recv->mad.mad.mad_hdr.mgmt_class ==
1889             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1890                 enum smi_forward_action retsmi;
1891
1892                 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1893                                            port_priv->device->node_type,
1894                                            port_num,
1895                                            port_priv->device->phys_port_cnt) ==
1896                                            IB_SMI_DISCARD)
1897                         goto out;
1898
1899                 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1900                 if (retsmi == IB_SMI_LOCAL)
1901                         goto local;
1902
1903                 if (retsmi == IB_SMI_SEND) { /* don't forward */
1904                         if (smi_handle_dr_smp_send(&recv->mad.smp,
1905                                                    port_priv->device->node_type,
1906                                                    port_num) == IB_SMI_DISCARD)
1907                                 goto out;
1908
1909                         if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1910                                 goto out;
1911                 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1912                         /* forward case for switches */
1913                         memcpy(response, recv, sizeof(*response));
1914                         response->header.recv_wc.wc = &response->header.wc;
1915                         response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1916                         response->header.recv_wc.recv_buf.grh = &response->grh;
1917
1918                         agent_send_response(&response->mad.mad,
1919                                             &response->grh, wc,
1920                                             port_priv->device,
1921                                             smi_get_fwd_port(&recv->mad.smp),
1922                                             qp_info->qp->qp_num);
1923
1924                         goto out;
1925                 }
1926         }
1927
1928 local:
1929         /* Give driver "right of first refusal" on incoming MAD */
1930         if (port_priv->device->process_mad) {
1931                 int ret;
1932
1933                 ret = port_priv->device->process_mad(port_priv->device, 0,
1934                                                      port_priv->port_num,
1935                                                      wc, &recv->grh,
1936                                                      &recv->mad.mad,
1937                                                      &response->mad.mad);
1938                 if (ret & IB_MAD_RESULT_SUCCESS) {
1939                         if (ret & IB_MAD_RESULT_CONSUMED)
1940                                 goto out;
1941                         if (ret & IB_MAD_RESULT_REPLY) {
1942                                 agent_send_response(&response->mad.mad,
1943                                                     &recv->grh, wc,
1944                                                     port_priv->device,
1945                                                     port_num,
1946                                                     qp_info->qp->qp_num);
1947                                 goto out;
1948                         }
1949                 }
1950         }
1951
1952         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1953         if (mad_agent) {
1954                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1955                 /*
1956                  * recv is freed up in error cases in ib_mad_complete_recv
1957                  * or via recv_handler in ib_mad_complete_recv()
1958                  */
1959                 recv = NULL;
1960         }
1961
1962 out:
1963         /* Post another receive request for this QP */
1964         if (response) {
1965                 ib_mad_post_receive_mads(qp_info, response);
1966                 if (recv)
1967                         kmem_cache_free(ib_mad_cache, recv);
1968         } else
1969                 ib_mad_post_receive_mads(qp_info, recv);
1970 }
1971
1972 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1973 {
1974         struct ib_mad_send_wr_private *mad_send_wr;
1975         unsigned long delay;
1976
1977         if (list_empty(&mad_agent_priv->wait_list)) {
1978                 cancel_delayed_work(&mad_agent_priv->timed_work);
1979         } else {
1980                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1981                                          struct ib_mad_send_wr_private,
1982                                          agent_list);
1983
1984                 if (time_after(mad_agent_priv->timeout,
1985                                mad_send_wr->timeout)) {
1986                         mad_agent_priv->timeout = mad_send_wr->timeout;
1987                         cancel_delayed_work(&mad_agent_priv->timed_work);
1988                         delay = mad_send_wr->timeout - jiffies;
1989                         if ((long)delay <= 0)
1990                                 delay = 1;
1991                         queue_delayed_work(mad_agent_priv->qp_info->
1992                                            port_priv->wq,
1993                                            &mad_agent_priv->timed_work, delay);
1994                 }
1995         }
1996 }
1997
1998 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1999 {
2000         struct ib_mad_agent_private *mad_agent_priv;
2001         struct ib_mad_send_wr_private *temp_mad_send_wr;
2002         struct list_head *list_item;
2003         unsigned long delay;
2004
2005         mad_agent_priv = mad_send_wr->mad_agent_priv;
2006         list_del(&mad_send_wr->agent_list);
2007
2008         delay = mad_send_wr->timeout;
2009         mad_send_wr->timeout += jiffies;
2010
2011         if (delay) {
2012                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2013                         temp_mad_send_wr = list_entry(list_item,
2014                                                 struct ib_mad_send_wr_private,
2015                                                 agent_list);
2016                         if (time_after(mad_send_wr->timeout,
2017                                        temp_mad_send_wr->timeout))
2018                                 break;
2019                 }
2020         }
2021         else
2022                 list_item = &mad_agent_priv->wait_list;
2023         list_add(&mad_send_wr->agent_list, list_item);
2024
2025         /* Reschedule a work item if we have a shorter timeout */
2026         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2027                 cancel_delayed_work(&mad_agent_priv->timed_work);
2028                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2029                                    &mad_agent_priv->timed_work, delay);
2030         }
2031 }
2032
2033 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2034                           int timeout_ms)
2035 {
2036         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2037         wait_for_response(mad_send_wr);
2038 }
2039
2040 /*
2041  * Process a send work completion
2042  */
2043 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2044                              struct ib_mad_send_wc *mad_send_wc)
2045 {
2046         struct ib_mad_agent_private     *mad_agent_priv;
2047         unsigned long                   flags;
2048         int                             ret;
2049
2050         mad_agent_priv = mad_send_wr->mad_agent_priv;
2051         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2052         if (mad_agent_priv->agent.rmpp_version) {
2053                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2054                 if (ret == IB_RMPP_RESULT_CONSUMED)
2055                         goto done;
2056         } else
2057                 ret = IB_RMPP_RESULT_UNHANDLED;
2058
2059         if (mad_send_wc->status != IB_WC_SUCCESS &&
2060             mad_send_wr->status == IB_WC_SUCCESS) {
2061                 mad_send_wr->status = mad_send_wc->status;
2062                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2063         }
2064
2065         if (--mad_send_wr->refcount > 0) {
2066                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2067                     mad_send_wr->status == IB_WC_SUCCESS) {
2068                         wait_for_response(mad_send_wr);
2069                 }
2070                 goto done;
2071         }
2072
2073         /* Remove send from MAD agent and notify client of completion */
2074         list_del(&mad_send_wr->agent_list);
2075         adjust_timeout(mad_agent_priv);
2076         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2077
2078         if (mad_send_wr->status != IB_WC_SUCCESS )
2079                 mad_send_wc->status = mad_send_wr->status;
2080         if (ret == IB_RMPP_RESULT_INTERNAL)
2081                 ib_rmpp_send_handler(mad_send_wc);
2082         else
2083                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2084                                                    mad_send_wc);
2085
2086         /* Release reference on agent taken when sending */
2087         deref_mad_agent(mad_agent_priv);
2088         return;
2089 done:
2090         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2091 }
2092
2093 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2094                                      struct ib_wc *wc)
2095 {
2096         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2097         struct ib_mad_list_head         *mad_list;
2098         struct ib_mad_qp_info           *qp_info;
2099         struct ib_mad_queue             *send_queue;
2100         struct ib_send_wr               *bad_send_wr;
2101         struct ib_mad_send_wc           mad_send_wc;
2102         unsigned long flags;
2103         int ret;
2104
2105         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2106         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2107                                    mad_list);
2108         send_queue = mad_list->mad_queue;
2109         qp_info = send_queue->qp_info;
2110
2111 retry:
2112         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2113                             mad_send_wr->header_mapping,
2114                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2115         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2116                             mad_send_wr->payload_mapping,
2117                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2118         queued_send_wr = NULL;
2119         spin_lock_irqsave(&send_queue->lock, flags);
2120         list_del(&mad_list->list);
2121
2122         /* Move queued send to the send queue */
2123         if (send_queue->count-- > send_queue->max_active) {
2124                 mad_list = container_of(qp_info->overflow_list.next,
2125                                         struct ib_mad_list_head, list);
2126                 queued_send_wr = container_of(mad_list,
2127                                         struct ib_mad_send_wr_private,
2128                                         mad_list);
2129                 list_move_tail(&mad_list->list, &send_queue->list);
2130         }
2131         spin_unlock_irqrestore(&send_queue->lock, flags);
2132
2133         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2134         mad_send_wc.status = wc->status;
2135         mad_send_wc.vendor_err = wc->vendor_err;
2136         if (atomic_read(&qp_info->snoop_count))
2137                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2138                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2139         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2140
2141         if (queued_send_wr) {
2142                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2143                                    &bad_send_wr);
2144                 if (ret) {
2145                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2146                         mad_send_wr = queued_send_wr;
2147                         wc->status = IB_WC_LOC_QP_OP_ERR;
2148                         goto retry;
2149                 }
2150         }
2151 }
2152
2153 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2154 {
2155         struct ib_mad_send_wr_private *mad_send_wr;
2156         struct ib_mad_list_head *mad_list;
2157         unsigned long flags;
2158
2159         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2160         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2161                 mad_send_wr = container_of(mad_list,
2162                                            struct ib_mad_send_wr_private,
2163                                            mad_list);
2164                 mad_send_wr->retry = 1;
2165         }
2166         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2167 }
2168
2169 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2170                               struct ib_wc *wc)
2171 {
2172         struct ib_mad_list_head *mad_list;
2173         struct ib_mad_qp_info *qp_info;
2174         struct ib_mad_send_wr_private *mad_send_wr;
2175         int ret;
2176
2177         /* Determine if failure was a send or receive */
2178         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2179         qp_info = mad_list->mad_queue->qp_info;
2180         if (mad_list->mad_queue == &qp_info->recv_queue)
2181                 /*
2182                  * Receive errors indicate that the QP has entered the error
2183                  * state - error handling/shutdown code will cleanup
2184                  */
2185                 return;
2186
2187         /*
2188          * Send errors will transition the QP to SQE - move
2189          * QP to RTS and repost flushed work requests
2190          */
2191         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2192                                    mad_list);
2193         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2194                 if (mad_send_wr->retry) {
2195                         /* Repost send */
2196                         struct ib_send_wr *bad_send_wr;
2197
2198                         mad_send_wr->retry = 0;
2199                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2200                                         &bad_send_wr);
2201                         if (ret)
2202                                 ib_mad_send_done_handler(port_priv, wc);
2203                 } else
2204                         ib_mad_send_done_handler(port_priv, wc);
2205         } else {
2206                 struct ib_qp_attr *attr;
2207
2208                 /* Transition QP to RTS and fail offending send */
2209                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2210                 if (attr) {
2211                         attr->qp_state = IB_QPS_RTS;
2212                         attr->cur_qp_state = IB_QPS_SQE;
2213                         ret = ib_modify_qp(qp_info->qp, attr,
2214                                            IB_QP_STATE | IB_QP_CUR_STATE);
2215                         kfree(attr);
2216                         if (ret)
2217                                 printk(KERN_ERR PFX "mad_error_handler - "
2218                                        "ib_modify_qp to RTS : %d\n", ret);
2219                         else
2220                                 mark_sends_for_retry(qp_info);
2221                 }
2222                 ib_mad_send_done_handler(port_priv, wc);
2223         }
2224 }
2225
2226 /*
2227  * IB MAD completion callback
2228  */
2229 static void ib_mad_completion_handler(struct work_struct *work)
2230 {
2231         struct ib_mad_port_private *port_priv;
2232         struct ib_wc wc;
2233
2234         port_priv = container_of(work, struct ib_mad_port_private, work);
2235         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2236
2237         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2238                 if (wc.status == IB_WC_SUCCESS) {
2239                         switch (wc.opcode) {
2240                         case IB_WC_SEND:
2241                                 ib_mad_send_done_handler(port_priv, &wc);
2242                                 break;
2243                         case IB_WC_RECV:
2244                                 ib_mad_recv_done_handler(port_priv, &wc);
2245                                 break;
2246                         default:
2247                                 BUG_ON(1);
2248                                 break;
2249                         }
2250                 } else
2251                         mad_error_handler(port_priv, &wc);
2252         }
2253 }
2254
2255 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2256 {
2257         unsigned long flags;
2258         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2259         struct ib_mad_send_wc mad_send_wc;
2260         struct list_head cancel_list;
2261
2262         INIT_LIST_HEAD(&cancel_list);
2263
2264         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2265         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2266                                  &mad_agent_priv->send_list, agent_list) {
2267                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2268                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2269                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2270                 }
2271         }
2272
2273         /* Empty wait list to prevent receives from finding a request */
2274         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2275         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2276
2277         /* Report all cancelled requests */
2278         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2279         mad_send_wc.vendor_err = 0;
2280
2281         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2282                                  &cancel_list, agent_list) {
2283                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2284                 list_del(&mad_send_wr->agent_list);
2285                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2286                                                    &mad_send_wc);
2287                 atomic_dec(&mad_agent_priv->refcount);
2288         }
2289 }
2290
2291 static struct ib_mad_send_wr_private*
2292 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2293              struct ib_mad_send_buf *send_buf)
2294 {
2295         struct ib_mad_send_wr_private *mad_send_wr;
2296
2297         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2298                             agent_list) {
2299                 if (&mad_send_wr->send_buf == send_buf)
2300                         return mad_send_wr;
2301         }
2302
2303         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2304                             agent_list) {
2305                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2306                     &mad_send_wr->send_buf == send_buf)
2307                         return mad_send_wr;
2308         }
2309         return NULL;
2310 }
2311
2312 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2313                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2314 {
2315         struct ib_mad_agent_private *mad_agent_priv;
2316         struct ib_mad_send_wr_private *mad_send_wr;
2317         unsigned long flags;
2318         int active;
2319
2320         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2321                                       agent);
2322         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2323         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2324         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2325                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2326                 return -EINVAL;
2327         }
2328
2329         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2330         if (!timeout_ms) {
2331                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2332                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2333         }
2334
2335         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2336         if (active)
2337                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2338         else
2339                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2340
2341         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2342         return 0;
2343 }
2344 EXPORT_SYMBOL(ib_modify_mad);
2345
2346 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2347                    struct ib_mad_send_buf *send_buf)
2348 {
2349         ib_modify_mad(mad_agent, send_buf, 0);
2350 }
2351 EXPORT_SYMBOL(ib_cancel_mad);
2352
2353 static void local_completions(struct work_struct *work)
2354 {
2355         struct ib_mad_agent_private *mad_agent_priv;
2356         struct ib_mad_local_private *local;
2357         struct ib_mad_agent_private *recv_mad_agent;
2358         unsigned long flags;
2359         int recv = 0;
2360         struct ib_wc wc;
2361         struct ib_mad_send_wc mad_send_wc;
2362
2363         mad_agent_priv =
2364                 container_of(work, struct ib_mad_agent_private, local_work);
2365
2366         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2367         while (!list_empty(&mad_agent_priv->local_list)) {
2368                 local = list_entry(mad_agent_priv->local_list.next,
2369                                    struct ib_mad_local_private,
2370                                    completion_list);
2371                 list_del(&local->completion_list);
2372                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2373                 if (local->mad_priv) {
2374                         recv_mad_agent = local->recv_mad_agent;
2375                         if (!recv_mad_agent) {
2376                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2377                                 goto local_send_completion;
2378                         }
2379
2380                         recv = 1;
2381                         /*
2382                          * Defined behavior is to complete response
2383                          * before request
2384                          */
2385                         build_smp_wc(recv_mad_agent->agent.qp,
2386                                      (unsigned long) local->mad_send_wr,
2387                                      be16_to_cpu(IB_LID_PERMISSIVE),
2388                                      0, recv_mad_agent->agent.port_num, &wc);
2389
2390                         local->mad_priv->header.recv_wc.wc = &wc;
2391                         local->mad_priv->header.recv_wc.mad_len =
2392                                                 sizeof(struct ib_mad);
2393                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2394                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2395                                  &local->mad_priv->header.recv_wc.rmpp_list);
2396                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2397                         local->mad_priv->header.recv_wc.recv_buf.mad =
2398                                                 &local->mad_priv->mad.mad;
2399                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2400                                 snoop_recv(recv_mad_agent->qp_info,
2401                                           &local->mad_priv->header.recv_wc,
2402                                            IB_MAD_SNOOP_RECVS);
2403                         recv_mad_agent->agent.recv_handler(
2404                                                 &recv_mad_agent->agent,
2405                                                 &local->mad_priv->header.recv_wc);
2406                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2407                         atomic_dec(&recv_mad_agent->refcount);
2408                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2409                 }
2410
2411 local_send_completion:
2412                 /* Complete send */
2413                 mad_send_wc.status = IB_WC_SUCCESS;
2414                 mad_send_wc.vendor_err = 0;
2415                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2416                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2417                         snoop_send(mad_agent_priv->qp_info,
2418                                    &local->mad_send_wr->send_buf,
2419                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2420                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2421                                                    &mad_send_wc);
2422
2423                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2424                 atomic_dec(&mad_agent_priv->refcount);
2425                 if (!recv)
2426                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2427                 kfree(local);
2428         }
2429         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2430 }
2431
2432 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2433 {
2434         int ret;
2435
2436         if (!mad_send_wr->retries_left)
2437                 return -ETIMEDOUT;
2438
2439         mad_send_wr->retries_left--;
2440         mad_send_wr->send_buf.retries++;
2441
2442         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2443
2444         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2445                 ret = ib_retry_rmpp(mad_send_wr);
2446                 switch (ret) {
2447                 case IB_RMPP_RESULT_UNHANDLED:
2448                         ret = ib_send_mad(mad_send_wr);
2449                         break;
2450                 case IB_RMPP_RESULT_CONSUMED:
2451                         ret = 0;
2452                         break;
2453                 default:
2454                         ret = -ECOMM;
2455                         break;
2456                 }
2457         } else
2458                 ret = ib_send_mad(mad_send_wr);
2459
2460         if (!ret) {
2461                 mad_send_wr->refcount++;
2462                 list_add_tail(&mad_send_wr->agent_list,
2463                               &mad_send_wr->mad_agent_priv->send_list);
2464         }
2465         return ret;
2466 }
2467
2468 static void timeout_sends(struct work_struct *work)
2469 {
2470         struct ib_mad_agent_private *mad_agent_priv;
2471         struct ib_mad_send_wr_private *mad_send_wr;
2472         struct ib_mad_send_wc mad_send_wc;
2473         unsigned long flags, delay;
2474
2475         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2476                                       timed_work.work);
2477         mad_send_wc.vendor_err = 0;
2478
2479         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2480         while (!list_empty(&mad_agent_priv->wait_list)) {
2481                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2482                                          struct ib_mad_send_wr_private,
2483                                          agent_list);
2484
2485                 if (time_after(mad_send_wr->timeout, jiffies)) {
2486                         delay = mad_send_wr->timeout - jiffies;
2487                         if ((long)delay <= 0)
2488                                 delay = 1;
2489                         queue_delayed_work(mad_agent_priv->qp_info->
2490                                            port_priv->wq,
2491                                            &mad_agent_priv->timed_work, delay);
2492                         break;
2493                 }
2494
2495                 list_del(&mad_send_wr->agent_list);
2496                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2497                     !retry_send(mad_send_wr))
2498                         continue;
2499
2500                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2501
2502                 if (mad_send_wr->status == IB_WC_SUCCESS)
2503                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2504                 else
2505                         mad_send_wc.status = mad_send_wr->status;
2506                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2507                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2508                                                    &mad_send_wc);
2509
2510                 atomic_dec(&mad_agent_priv->refcount);
2511                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2512         }
2513         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2514 }
2515
2516 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2517 {
2518         struct ib_mad_port_private *port_priv = cq->cq_context;
2519         unsigned long flags;
2520
2521         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2522         if (!list_empty(&port_priv->port_list))
2523                 queue_work(port_priv->wq, &port_priv->work);
2524         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2525 }
2526
2527 /*
2528  * Allocate receive MADs and post receive WRs for them
2529  */
2530 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2531                                     struct ib_mad_private *mad)
2532 {
2533         unsigned long flags;
2534         int post, ret;
2535         struct ib_mad_private *mad_priv;
2536         struct ib_sge sg_list;
2537         struct ib_recv_wr recv_wr, *bad_recv_wr;
2538         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2539
2540         /* Initialize common scatter list fields */
2541         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2542         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2543
2544         /* Initialize common receive WR fields */
2545         recv_wr.next = NULL;
2546         recv_wr.sg_list = &sg_list;
2547         recv_wr.num_sge = 1;
2548
2549         do {
2550                 /* Allocate and map receive buffer */
2551                 if (mad) {
2552                         mad_priv = mad;
2553                         mad = NULL;
2554                 } else {
2555                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2556                         if (!mad_priv) {
2557                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2558                                 ret = -ENOMEM;
2559                                 break;
2560                         }
2561                 }
2562                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2563                                                  &mad_priv->grh,
2564                                                  sizeof *mad_priv -
2565                                                    sizeof mad_priv->header,
2566                                                  DMA_FROM_DEVICE);
2567                 mad_priv->header.mapping = sg_list.addr;
2568                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2569                 mad_priv->header.mad_list.mad_queue = recv_queue;
2570
2571                 /* Post receive WR */
2572                 spin_lock_irqsave(&recv_queue->lock, flags);
2573                 post = (++recv_queue->count < recv_queue->max_active);
2574                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2575                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2576                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2577                 if (ret) {
2578                         spin_lock_irqsave(&recv_queue->lock, flags);
2579                         list_del(&mad_priv->header.mad_list.list);
2580                         recv_queue->count--;
2581                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2582                         ib_dma_unmap_single(qp_info->port_priv->device,
2583                                             mad_priv->header.mapping,
2584                                             sizeof *mad_priv -
2585                                               sizeof mad_priv->header,
2586                                             DMA_FROM_DEVICE);
2587                         kmem_cache_free(ib_mad_cache, mad_priv);
2588                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2589                         break;
2590                 }
2591         } while (post);
2592
2593         return ret;
2594 }
2595
2596 /*
2597  * Return all the posted receive MADs
2598  */
2599 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2600 {
2601         struct ib_mad_private_header *mad_priv_hdr;
2602         struct ib_mad_private *recv;
2603         struct ib_mad_list_head *mad_list;
2604
2605         while (!list_empty(&qp_info->recv_queue.list)) {
2606
2607                 mad_list = list_entry(qp_info->recv_queue.list.next,
2608                                       struct ib_mad_list_head, list);
2609                 mad_priv_hdr = container_of(mad_list,
2610                                             struct ib_mad_private_header,
2611                                             mad_list);
2612                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2613                                     header);
2614
2615                 /* Remove from posted receive MAD list */
2616                 list_del(&mad_list->list);
2617
2618                 ib_dma_unmap_single(qp_info->port_priv->device,
2619                                     recv->header.mapping,
2620                                     sizeof(struct ib_mad_private) -
2621                                       sizeof(struct ib_mad_private_header),
2622                                     DMA_FROM_DEVICE);
2623                 kmem_cache_free(ib_mad_cache, recv);
2624         }
2625
2626         qp_info->recv_queue.count = 0;
2627 }
2628
2629 /*
2630  * Start the port
2631  */
2632 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2633 {
2634         int ret, i;
2635         struct ib_qp_attr *attr;
2636         struct ib_qp *qp;
2637
2638         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2639         if (!attr) {
2640                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2641                 return -ENOMEM;
2642         }
2643
2644         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2645                 qp = port_priv->qp_info[i].qp;
2646                 /*
2647                  * PKey index for QP1 is irrelevant but
2648                  * one is needed for the Reset to Init transition
2649                  */
2650                 attr->qp_state = IB_QPS_INIT;
2651                 attr->pkey_index = 0;
2652                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2653                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2654                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2655                 if (ret) {
2656                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2657                                "INIT: %d\n", i, ret);
2658                         goto out;
2659                 }
2660
2661                 attr->qp_state = IB_QPS_RTR;
2662                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2663                 if (ret) {
2664                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2665                                "RTR: %d\n", i, ret);
2666                         goto out;
2667                 }
2668
2669                 attr->qp_state = IB_QPS_RTS;
2670                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2671                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2672                 if (ret) {
2673                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674                                "RTS: %d\n", i, ret);
2675                         goto out;
2676                 }
2677         }
2678
2679         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2680         if (ret) {
2681                 printk(KERN_ERR PFX "Failed to request completion "
2682                        "notification: %d\n", ret);
2683                 goto out;
2684         }
2685
2686         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2687                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2688                 if (ret) {
2689                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2690                         goto out;
2691                 }
2692         }
2693 out:
2694         kfree(attr);
2695         return ret;
2696 }
2697
2698 static void qp_event_handler(struct ib_event *event, void *qp_context)
2699 {
2700         struct ib_mad_qp_info   *qp_info = qp_context;
2701
2702         /* It's worse than that! He's dead, Jim! */
2703         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2704                 event->event, qp_info->qp->qp_num);
2705 }
2706
2707 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2708                            struct ib_mad_queue *mad_queue)
2709 {
2710         mad_queue->qp_info = qp_info;
2711         mad_queue->count = 0;
2712         spin_lock_init(&mad_queue->lock);
2713         INIT_LIST_HEAD(&mad_queue->list);
2714 }
2715
2716 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2717                         struct ib_mad_qp_info *qp_info)
2718 {
2719         qp_info->port_priv = port_priv;
2720         init_mad_queue(qp_info, &qp_info->send_queue);
2721         init_mad_queue(qp_info, &qp_info->recv_queue);
2722         INIT_LIST_HEAD(&qp_info->overflow_list);
2723         spin_lock_init(&qp_info->snoop_lock);
2724         qp_info->snoop_table = NULL;
2725         qp_info->snoop_table_size = 0;
2726         atomic_set(&qp_info->snoop_count, 0);
2727 }
2728
2729 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2730                          enum ib_qp_type qp_type)
2731 {
2732         struct ib_qp_init_attr  qp_init_attr;
2733         int ret;
2734
2735         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2736         qp_init_attr.send_cq = qp_info->port_priv->cq;
2737         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2738         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2739         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2740         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2741         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2742         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2743         qp_init_attr.qp_type = qp_type;
2744         qp_init_attr.port_num = qp_info->port_priv->port_num;
2745         qp_init_attr.qp_context = qp_info;
2746         qp_init_attr.event_handler = qp_event_handler;
2747         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2748         if (IS_ERR(qp_info->qp)) {
2749                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2750                        get_spl_qp_index(qp_type));
2751                 ret = PTR_ERR(qp_info->qp);
2752                 goto error;
2753         }
2754         /* Use minimum queue sizes unless the CQ is resized */
2755         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2756         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2757         return 0;
2758
2759 error:
2760         return ret;
2761 }
2762
2763 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2764 {
2765         ib_destroy_qp(qp_info->qp);
2766         kfree(qp_info->snoop_table);
2767 }
2768
2769 /*
2770  * Open the port
2771  * Create the QP, PD, MR, and CQ if needed
2772  */
2773 static int ib_mad_port_open(struct ib_device *device,
2774                             int port_num)
2775 {
2776         int ret, cq_size;
2777         struct ib_mad_port_private *port_priv;
2778         unsigned long flags;
2779         char name[sizeof "ib_mad123"];
2780
2781         /* Create new device info */
2782         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2783         if (!port_priv) {
2784                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2785                 return -ENOMEM;
2786         }
2787
2788         port_priv->device = device;
2789         port_priv->port_num = port_num;
2790         spin_lock_init(&port_priv->reg_lock);
2791         INIT_LIST_HEAD(&port_priv->agent_list);
2792         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2793         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2794
2795         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2796         port_priv->cq = ib_create_cq(port_priv->device,
2797                                      ib_mad_thread_completion_handler,
2798                                      NULL, port_priv, cq_size, 0);
2799         if (IS_ERR(port_priv->cq)) {
2800                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2801                 ret = PTR_ERR(port_priv->cq);
2802                 goto error3;
2803         }
2804
2805         port_priv->pd = ib_alloc_pd(device);
2806         if (IS_ERR(port_priv->pd)) {
2807                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2808                 ret = PTR_ERR(port_priv->pd);
2809                 goto error4;
2810         }
2811
2812         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2813         if (IS_ERR(port_priv->mr)) {
2814                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2815                 ret = PTR_ERR(port_priv->mr);
2816                 goto error5;
2817         }
2818
2819         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2820         if (ret)
2821                 goto error6;
2822         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2823         if (ret)
2824                 goto error7;
2825
2826         snprintf(name, sizeof name, "ib_mad%d", port_num);
2827         port_priv->wq = create_singlethread_workqueue(name);
2828         if (!port_priv->wq) {
2829                 ret = -ENOMEM;
2830                 goto error8;
2831         }
2832         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2833
2834         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2835         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2836         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2837
2838         ret = ib_mad_port_start(port_priv);
2839         if (ret) {
2840                 printk(KERN_ERR PFX "Couldn't start port\n");
2841                 goto error9;
2842         }
2843
2844         return 0;
2845
2846 error9:
2847         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2848         list_del_init(&port_priv->port_list);
2849         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2850
2851         destroy_workqueue(port_priv->wq);
2852 error8:
2853         destroy_mad_qp(&port_priv->qp_info[1]);
2854 error7:
2855         destroy_mad_qp(&port_priv->qp_info[0]);
2856 error6:
2857         ib_dereg_mr(port_priv->mr);
2858 error5:
2859         ib_dealloc_pd(port_priv->pd);
2860 error4:
2861         ib_destroy_cq(port_priv->cq);
2862         cleanup_recv_queue(&port_priv->qp_info[1]);
2863         cleanup_recv_queue(&port_priv->qp_info[0]);
2864 error3:
2865         kfree(port_priv);
2866
2867         return ret;
2868 }
2869
2870 /*
2871  * Close the port
2872  * If there are no classes using the port, free the port
2873  * resources (CQ, MR, PD, QP) and remove the port's info structure
2874  */
2875 static int ib_mad_port_close(struct ib_device *device, int port_num)
2876 {
2877         struct ib_mad_port_private *port_priv;
2878         unsigned long flags;
2879
2880         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2881         port_priv = __ib_get_mad_port(device, port_num);
2882         if (port_priv == NULL) {
2883                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2884                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2885                 return -ENODEV;
2886         }
2887         list_del_init(&port_priv->port_list);
2888         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2889
2890         destroy_workqueue(port_priv->wq);
2891         destroy_mad_qp(&port_priv->qp_info[1]);
2892         destroy_mad_qp(&port_priv->qp_info[0]);
2893         ib_dereg_mr(port_priv->mr);
2894         ib_dealloc_pd(port_priv->pd);
2895         ib_destroy_cq(port_priv->cq);
2896         cleanup_recv_queue(&port_priv->qp_info[1]);
2897         cleanup_recv_queue(&port_priv->qp_info[0]);
2898         /* XXX: Handle deallocation of MAD registration tables */
2899
2900         kfree(port_priv);
2901
2902         return 0;
2903 }
2904
2905 static void ib_mad_init_device(struct ib_device *device)
2906 {
2907         int start, end, i;
2908
2909         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2910                 return;
2911
2912         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2913                 start = 0;
2914                 end   = 0;
2915         } else {
2916                 start = 1;
2917                 end   = device->phys_port_cnt;
2918         }
2919
2920         for (i = start; i <= end; i++) {
2921                 if (ib_mad_port_open(device, i)) {
2922                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2923                                device->name, i);
2924                         goto error;
2925                 }
2926                 if (ib_agent_port_open(device, i)) {
2927                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2928                                "for agents\n",
2929                                device->name, i);
2930                         goto error_agent;
2931                 }
2932         }
2933         return;
2934
2935 error_agent:
2936         if (ib_mad_port_close(device, i))
2937                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2938                        device->name, i);
2939
2940 error:
2941         i--;
2942
2943         while (i >= start) {
2944                 if (ib_agent_port_close(device, i))
2945                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2946                                "for agents\n",
2947                                device->name, i);
2948                 if (ib_mad_port_close(device, i))
2949                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2950                                device->name, i);
2951                 i--;
2952         }
2953 }
2954
2955 static void ib_mad_remove_device(struct ib_device *device)
2956 {
2957         int i, num_ports, cur_port;
2958
2959         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2960                 num_ports = 1;
2961                 cur_port = 0;
2962         } else {
2963                 num_ports = device->phys_port_cnt;
2964                 cur_port = 1;
2965         }
2966         for (i = 0; i < num_ports; i++, cur_port++) {
2967                 if (ib_agent_port_close(device, cur_port))
2968                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2969                                "for agents\n",
2970                                device->name, cur_port);
2971                 if (ib_mad_port_close(device, cur_port))
2972                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2973                                device->name, cur_port);
2974         }
2975 }
2976
2977 static struct ib_client mad_client = {
2978         .name   = "mad",
2979         .add = ib_mad_init_device,
2980         .remove = ib_mad_remove_device
2981 };
2982
2983 static int __init ib_mad_init_module(void)
2984 {
2985         int ret;
2986
2987         spin_lock_init(&ib_mad_port_list_lock);
2988
2989         ib_mad_cache = kmem_cache_create("ib_mad",
2990                                          sizeof(struct ib_mad_private),
2991                                          0,
2992                                          SLAB_HWCACHE_ALIGN,
2993                                          NULL);
2994         if (!ib_mad_cache) {
2995                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2996                 ret = -ENOMEM;
2997                 goto error1;
2998         }
2999
3000         INIT_LIST_HEAD(&ib_mad_port_list);
3001
3002         if (ib_register_client(&mad_client)) {
3003                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3004                 ret = -EINVAL;
3005                 goto error2;
3006         }
3007
3008         return 0;
3009
3010 error2:
3011         kmem_cache_destroy(ib_mad_cache);
3012 error1:
3013         return ret;
3014 }
3015
3016 static void __exit ib_mad_cleanup_module(void)
3017 {
3018         ib_unregister_client(&mad_client);
3019         kmem_cache_destroy(ib_mad_cache);
3020 }
3021
3022 module_init(ib_mad_init_module);
3023 module_exit(ib_mad_cleanup_module);
3024