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