kernel/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  * Copyright (c) 2009 HNR Consulting. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  */
  36
  37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  38
  39 #include <linux/dma-mapping.h>
  40 #include <linux/slab.h>
  41 #include <linux/module.h>
  42 #include <rdma/ib_cache.h>
  43
  44 #include "mad_priv.h"
  45 #include "mad_rmpp.h"
  46 #include "smi.h"
  47 #include "agent.h"
  48
  49 MODULE_LICENSE("Dual BSD/GPL");
  50 MODULE_DESCRIPTION("kernel IB MAD API");
  51 MODULE_AUTHOR("Hal Rosenstock");
  52 MODULE_AUTHOR("Sean Hefty");
  53
  54 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
  55 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
  56
  57 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
  58 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
  59 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
  60 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
  61
  62 static struct kmem_cache *ib_mad_cache;
  63
  64 static struct list_head ib_mad_port_list;
  65 static u32 ib_mad_client_id = 0;
  66
  67 /* Port list lock */
  68 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
  69
  70 /* Forward declarations */
  71 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  72                          struct ib_mad_reg_req *mad_reg_req);
  73 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  74 static struct ib_mad_agent_private *find_mad_agent(
  75                                         struct ib_mad_port_private *port_priv,
  76                                         struct ib_mad *mad);
  77 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  78                                     struct ib_mad_private *mad);
  79 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  80 static void timeout_sends(struct work_struct *work);
  81 static void local_completions(struct work_struct *work);
  82 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  83                               struct ib_mad_agent_private *agent_priv,
  84                               u8 mgmt_class);
  85 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  86                            struct ib_mad_agent_private *agent_priv);
  87
  88 /*
  89  * Returns a ib_mad_port_private structure or NULL for a device/port
  90  * Assumes ib_mad_port_list_lock is being held
  91  */
  92 static inline struct ib_mad_port_private *
  93 __ib_get_mad_port(struct ib_device *device, int port_num)
  94 {
  95         struct ib_mad_port_private *entry;
  96
  97         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  98                 if (entry->device == device && entry->port_num == port_num)
  99                         return entry;
 100         }
 101         return NULL;
 102 }
 103
 104 /*
 105  * Wrapper function to return a ib_mad_port_private structure or NULL
 106  * for a device/port
 107  */
 108 static inline struct ib_mad_port_private *
 109 ib_get_mad_port(struct ib_device *device, int port_num)
 110 {
 111         struct ib_mad_port_private *entry;
 112         unsigned long flags;
 113
 114         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 115         entry = __ib_get_mad_port(device, port_num);
 116         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 117
 118         return entry;
 119 }
 120
 121 static inline u8 convert_mgmt_class(u8 mgmt_class)
 122 {
 123         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 124         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 125                 0 : mgmt_class;
 126 }
 127
 128 static int get_spl_qp_index(enum ib_qp_type qp_type)
 129 {
 130         switch (qp_type)
 131         {
 132         case IB_QPT_SMI:
 133                 return 0;
 134         case IB_QPT_GSI:
 135                 return 1;
 136         default:
 137                 return -1;
 138         }
 139 }
 140
 141 static int vendor_class_index(u8 mgmt_class)
 142 {
 143         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 144 }
 145
 146 static int is_vendor_class(u8 mgmt_class)
 147 {
 148         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 149             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 150                 return 0;
 151         return 1;
 152 }
 153
 154 static int is_vendor_oui(char *oui)
 155 {
 156         if (oui[0] || oui[1] || oui[2])
 157                 return 1;
 158         return 0;
 159 }
 160
 161 static int is_vendor_method_in_use(
 162                 struct ib_mad_mgmt_vendor_class *vendor_class,
 163                 struct ib_mad_reg_req *mad_reg_req)
 164 {
 165         struct ib_mad_mgmt_method_table *method;
 166         int i;
 167
 168         for (i = 0; i < MAX_MGMT_OUI; i++) {
 169                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 170                         method = vendor_class->method_table[i];
 171                         if (method) {
 172                                 if (method_in_use(&method, mad_reg_req))
 173                                         return 1;
 174                                 else
 175                                         break;
 176                         }
 177                 }
 178         }
 179         return 0;
 180 }
 181
 182 int ib_response_mad(struct ib_mad *mad)
 183 {
 184         return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
 185                 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 186                 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
 187                  (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
 188 }
 189 EXPORT_SYMBOL(ib_response_mad);
 190
 191 /*
 192  * ib_register_mad_agent - Register to send/receive MADs
 193  */
 194 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 195                                            u8 port_num,
 196                                            enum ib_qp_type qp_type,
 197                                            struct ib_mad_reg_req *mad_reg_req,
 198                                            u8 rmpp_version,
 199                                            ib_mad_send_handler send_handler,
 200                                            ib_mad_recv_handler recv_handler,
 201                                            void *context,
 202                                            u32 registration_flags)
 203 {
 204         struct ib_mad_port_private *port_priv;
 205         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 206         struct ib_mad_agent_private *mad_agent_priv;
 207         struct ib_mad_reg_req *reg_req = NULL;
 208         struct ib_mad_mgmt_class_table *class;
 209         struct ib_mad_mgmt_vendor_class_table *vendor;
 210         struct ib_mad_mgmt_vendor_class *vendor_class;
 211         struct ib_mad_mgmt_method_table *method;
 212         int ret2, qpn;
 213         unsigned long flags;
 214         u8 mgmt_class, vclass;
 215
 216         /* Validate parameters */
 217         qpn = get_spl_qp_index(qp_type);
 218         if (qpn == -1) {
 219                 dev_notice(&device->dev,
 220                            "ib_register_mad_agent: invalid QP Type %d\n",
 221                            qp_type);
 222                 goto error1;
 223         }
 224
 225         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
 226                 dev_notice(&device->dev,
 227                            "ib_register_mad_agent: invalid RMPP Version %u\n",
 228                            rmpp_version);
 229                 goto error1;
 230         }
 231
 232         /* Validate MAD registration request if supplied */
 233         if (mad_reg_req) {
 234                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
 235                         dev_notice(&device->dev,
 236                                    "ib_register_mad_agent: invalid Class Version %u\n",
 237                                    mad_reg_req->mgmt_class_version);
 238                         goto error1;
 239                 }
 240                 if (!recv_handler) {
 241                         dev_notice(&device->dev,
 242                                    "ib_register_mad_agent: no recv_handler\n");
 243                         goto error1;
 244                 }
 245                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 246                         /*
 247                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 248                          * one in this range currently allowed
 249                          */
 250                         if (mad_reg_req->mgmt_class !=
 251                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 252                                 dev_notice(&device->dev,
 253                                            "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
 254                                            mad_reg_req->mgmt_class);
 255                                 goto error1;
 256                         }
 257                 } else if (mad_reg_req->mgmt_class == 0) {
 258                         /*
 259                          * Class 0 is reserved in IBA and is used for
 260                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 261                          */
 262                         dev_notice(&device->dev,
 263                                    "ib_register_mad_agent: Invalid Mgmt Class 0\n");
 264                         goto error1;
 265                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 266                         /*
 267                          * If class is in "new" vendor range,
 268                          * ensure supplied OUI is not zero
 269                          */
 270                         if (!is_vendor_oui(mad_reg_req->oui)) {
 271                                 dev_notice(&device->dev,
 272                                            "ib_register_mad_agent: No OUI specified for class 0x%x\n",
 273                                            mad_reg_req->mgmt_class);
 274                                 goto error1;
 275                         }
 276                 }
 277                 /* Make sure class supplied is consistent with RMPP */
 278                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 279                         if (rmpp_version) {
 280                                 dev_notice(&device->dev,
 281                                            "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
 282                                            mad_reg_req->mgmt_class);
 283                                 goto error1;
 284                         }
 285                 }
 286
 287                 /* Make sure class supplied is consistent with QP type */
 288                 if (qp_type == IB_QPT_SMI) {
 289                         if ((mad_reg_req->mgmt_class !=
 290                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 291                             (mad_reg_req->mgmt_class !=
 292                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
 293                                 dev_notice(&device->dev,
 294                                            "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
 295                                            mad_reg_req->mgmt_class);
 296                                 goto error1;
 297                         }
 298                 } else {
 299                         if ((mad_reg_req->mgmt_class ==
 300                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 301                             (mad_reg_req->mgmt_class ==
 302                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
 303                                 dev_notice(&device->dev,
 304                                            "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
 305                                            mad_reg_req->mgmt_class);
 306                                 goto error1;
 307                         }
 308                 }
 309         } else {
 310                 /* No registration request supplied */
 311                 if (!send_handler)
 312                         goto error1;
 313                 if (registration_flags & IB_MAD_USER_RMPP)
 314                         goto error1;
 315         }
 316
 317         /* Validate device and port */
 318         port_priv = ib_get_mad_port(device, port_num);
 319         if (!port_priv) {
 320                 dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
 321                 ret = ERR_PTR(-ENODEV);
 322                 goto error1;
 323         }
 324
 325         /* Verify the QP requested is supported.  For example, Ethernet devices
 326          * will not have QP0 */
 327         if (!port_priv->qp_info[qpn].qp) {
 328                 dev_notice(&device->dev,
 329                            "ib_register_mad_agent: QP %d not supported\n", qpn);
 330                 ret = ERR_PTR(-EPROTONOSUPPORT);
 331                 goto error1;
 332         }
 333
 334         /* Allocate structures */
 335         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 336         if (!mad_agent_priv) {
 337                 ret = ERR_PTR(-ENOMEM);
 338                 goto error1;
 339         }
 340
 341         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 342                                                  IB_ACCESS_LOCAL_WRITE);
 343         if (IS_ERR(mad_agent_priv->agent.mr)) {
 344                 ret = ERR_PTR(-ENOMEM);
 345                 goto error2;
 346         }
 347
 348         if (mad_reg_req) {
 349                 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
 350                 if (!reg_req) {
 351                         ret = ERR_PTR(-ENOMEM);
 352                         goto error3;
 353                 }
 354         }
 355
 356         /* Now, fill in the various structures */
 357         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 358         mad_agent_priv->reg_req = reg_req;
 359         mad_agent_priv->agent.rmpp_version = rmpp_version;
 360         mad_agent_priv->agent.device = device;
 361         mad_agent_priv->agent.recv_handler = recv_handler;
 362         mad_agent_priv->agent.send_handler = send_handler;
 363         mad_agent_priv->agent.context = context;
 364         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 365         mad_agent_priv->agent.port_num = port_num;
 366         mad_agent_priv->agent.flags = registration_flags;
 367         spin_lock_init(&mad_agent_priv->lock);
 368         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 369         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 370         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 371         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 372         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 373         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 374         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 375         atomic_set(&mad_agent_priv->refcount, 1);
 376         init_completion(&mad_agent_priv->comp);
 377
 378         spin_lock_irqsave(&port_priv->reg_lock, flags);
 379         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 380
 381         /*
 382          * Make sure MAD registration (if supplied)
 383          * is non overlapping with any existing ones
 384          */
 385         if (mad_reg_req) {
 386                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 387                 if (!is_vendor_class(mgmt_class)) {
 388                         class = port_priv->version[mad_reg_req->
 389                                                    mgmt_class_version].class;
 390                         if (class) {
 391                                 method = class->method_table[mgmt_class];
 392                                 if (method) {
 393                                         if (method_in_use(&method,
 394                                                            mad_reg_req))
 395                                                 goto error4;
 396                                 }
 397                         }
 398                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 399                                                   mgmt_class);
 400                 } else {
 401                         /* "New" vendor class range */
 402                         vendor = port_priv->version[mad_reg_req->
 403                                                     mgmt_class_version].vendor;
 404                         if (vendor) {
 405                                 vclass = vendor_class_index(mgmt_class);
 406                                 vendor_class = vendor->vendor_class[vclass];
 407                                 if (vendor_class) {
 408                                         if (is_vendor_method_in_use(
 409                                                         vendor_class,
 410                                                         mad_reg_req))
 411                                                 goto error4;
 412                                 }
 413                         }
 414                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 415                 }
 416                 if (ret2) {
 417                         ret = ERR_PTR(ret2);
 418                         goto error4;
 419                 }
 420         }
 421
 422         /* Add mad agent into port's agent list */
 423         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 424         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 425
 426         return &mad_agent_priv->agent;
 427
 428 error4:
 429         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 430         kfree(reg_req);
 431 error3:
 432         ib_dereg_mr(mad_agent_priv->agent.mr);
 433 error2:
 434         kfree(mad_agent_priv);
 435 error1:
 436         return ret;
 437 }
 438 EXPORT_SYMBOL(ib_register_mad_agent);
 439
 440 static inline int is_snooping_sends(int mad_snoop_flags)
 441 {
 442         return (mad_snoop_flags &
 443                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 444                  IB_MAD_SNOOP_RMPP_SENDS |*/
 445                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 446                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 447 }
 448
 449 static inline int is_snooping_recvs(int mad_snoop_flags)
 450 {
 451         return (mad_snoop_flags &
 452                 (IB_MAD_SNOOP_RECVS /*|
 453                  IB_MAD_SNOOP_RMPP_RECVS*/));
 454 }
 455
 456 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 457                                 struct ib_mad_snoop_private *mad_snoop_priv)
 458 {
 459         struct ib_mad_snoop_private **new_snoop_table;
 460         unsigned long flags;
 461         int i;
 462
 463         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 464         /* Check for empty slot in array. */
 465         for (i = 0; i < qp_info->snoop_table_size; i++)
 466                 if (!qp_info->snoop_table[i])
 467                         break;
 468
 469         if (i == qp_info->snoop_table_size) {
 470                 /* Grow table. */
 471                 new_snoop_table = krealloc(qp_info->snoop_table,
 472                                            sizeof mad_snoop_priv *
 473                                            (qp_info->snoop_table_size + 1),
 474                                            GFP_ATOMIC);
 475                 if (!new_snoop_table) {
 476                         i = -ENOMEM;
 477                         goto out;
 478                 }
 479
 480                 qp_info->snoop_table = new_snoop_table;
 481                 qp_info->snoop_table_size++;
 482         }
 483         qp_info->snoop_table[i] = mad_snoop_priv;
 484         atomic_inc(&qp_info->snoop_count);
 485 out:
 486         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 487         return i;
 488 }
 489
 490 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 491                                            u8 port_num,
 492                                            enum ib_qp_type qp_type,
 493                                            int mad_snoop_flags,
 494                                            ib_mad_snoop_handler snoop_handler,
 495                                            ib_mad_recv_handler recv_handler,
 496                                            void *context)
 497 {
 498         struct ib_mad_port_private *port_priv;
 499         struct ib_mad_agent *ret;
 500         struct ib_mad_snoop_private *mad_snoop_priv;
 501         int qpn;
 502
 503         /* Validate parameters */
 504         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 505             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 506                 ret = ERR_PTR(-EINVAL);
 507                 goto error1;
 508         }
 509         qpn = get_spl_qp_index(qp_type);
 510         if (qpn == -1) {
 511                 ret = ERR_PTR(-EINVAL);
 512                 goto error1;
 513         }
 514         port_priv = ib_get_mad_port(device, port_num);
 515         if (!port_priv) {
 516                 ret = ERR_PTR(-ENODEV);
 517                 goto error1;
 518         }
 519         /* Allocate structures */
 520         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 521         if (!mad_snoop_priv) {
 522                 ret = ERR_PTR(-ENOMEM);
 523                 goto error1;
 524         }
 525
 526         /* Now, fill in the various structures */
 527         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 528         mad_snoop_priv->agent.device = device;
 529         mad_snoop_priv->agent.recv_handler = recv_handler;
 530         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 531         mad_snoop_priv->agent.context = context;
 532         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 533         mad_snoop_priv->agent.port_num = port_num;
 534         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 535         init_completion(&mad_snoop_priv->comp);
 536         mad_snoop_priv->snoop_index = register_snoop_agent(
 537                                                 &port_priv->qp_info[qpn],
 538                                                 mad_snoop_priv);
 539         if (mad_snoop_priv->snoop_index < 0) {
 540                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 541                 goto error2;
 542         }
 543
 544         atomic_set(&mad_snoop_priv->refcount, 1);
 545         return &mad_snoop_priv->agent;
 546
 547 error2:
 548         kfree(mad_snoop_priv);
 549 error1:
 550         return ret;
 551 }
 552 EXPORT_SYMBOL(ib_register_mad_snoop);
 553
 554 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 555 {
 556         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 557                 complete(&mad_agent_priv->comp);
 558 }
 559
 560 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 561 {
 562         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 563                 complete(&mad_snoop_priv->comp);
 564 }
 565
 566 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 567 {
 568         struct ib_mad_port_private *port_priv;
 569         unsigned long flags;
 570
 571         /* Note that we could still be handling received MADs */
 572
 573         /*
 574          * Canceling all sends results in dropping received response
 575          * MADs, preventing us from queuing additional work
 576          */
 577         cancel_mads(mad_agent_priv);
 578         port_priv = mad_agent_priv->qp_info->port_priv;
 579         cancel_delayed_work(&mad_agent_priv->timed_work);
 580
 581         spin_lock_irqsave(&port_priv->reg_lock, flags);
 582         remove_mad_reg_req(mad_agent_priv);
 583         list_del(&mad_agent_priv->agent_list);
 584         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 585
 586         flush_workqueue(port_priv->wq);
 587         ib_cancel_rmpp_recvs(mad_agent_priv);
 588
 589         deref_mad_agent(mad_agent_priv);
 590         wait_for_completion(&mad_agent_priv->comp);
 591
 592         kfree(mad_agent_priv->reg_req);
 593         ib_dereg_mr(mad_agent_priv->agent.mr);
 594         kfree(mad_agent_priv);
 595 }
 596
 597 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 598 {
 599         struct ib_mad_qp_info *qp_info;
 600         unsigned long flags;
 601
 602         qp_info = mad_snoop_priv->qp_info;
 603         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 604         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 605         atomic_dec(&qp_info->snoop_count);
 606         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 607
 608         deref_snoop_agent(mad_snoop_priv);
 609         wait_for_completion(&mad_snoop_priv->comp);
 610
 611         kfree(mad_snoop_priv);
 612 }
 613
 614 /*
 615  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 616  */
 617 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 618 {
 619         struct ib_mad_agent_private *mad_agent_priv;
 620         struct ib_mad_snoop_private *mad_snoop_priv;
 621
 622         /* If the TID is zero, the agent can only snoop. */
 623         if (mad_agent->hi_tid) {
 624                 mad_agent_priv = container_of(mad_agent,
 625                                               struct ib_mad_agent_private,
 626                                               agent);
 627                 unregister_mad_agent(mad_agent_priv);
 628         } else {
 629                 mad_snoop_priv = container_of(mad_agent,
 630                                               struct ib_mad_snoop_private,
 631                                               agent);
 632                 unregister_mad_snoop(mad_snoop_priv);
 633         }
 634         return 0;
 635 }
 636 EXPORT_SYMBOL(ib_unregister_mad_agent);
 637
 638 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 639 {
 640         struct ib_mad_queue *mad_queue;
 641         unsigned long flags;
 642
 643         BUG_ON(!mad_list->mad_queue);
 644         mad_queue = mad_list->mad_queue;
 645         spin_lock_irqsave(&mad_queue->lock, flags);
 646         list_del(&mad_list->list);
 647         mad_queue->count--;
 648         spin_unlock_irqrestore(&mad_queue->lock, flags);
 649 }
 650
 651 static void snoop_send(struct ib_mad_qp_info *qp_info,
 652                        struct ib_mad_send_buf *send_buf,
 653                        struct ib_mad_send_wc *mad_send_wc,
 654                        int mad_snoop_flags)
 655 {
 656         struct ib_mad_snoop_private *mad_snoop_priv;
 657         unsigned long flags;
 658         int i;
 659
 660         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 661         for (i = 0; i < qp_info->snoop_table_size; i++) {
 662                 mad_snoop_priv = qp_info->snoop_table[i];
 663                 if (!mad_snoop_priv ||
 664                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 665                         continue;
 666
 667                 atomic_inc(&mad_snoop_priv->refcount);
 668                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 669                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 670                                                     send_buf, mad_send_wc);
 671                 deref_snoop_agent(mad_snoop_priv);
 672                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 673         }
 674         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 675 }
 676
 677 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 678                        struct ib_mad_recv_wc *mad_recv_wc,
 679                        int mad_snoop_flags)
 680 {
 681         struct ib_mad_snoop_private *mad_snoop_priv;
 682         unsigned long flags;
 683         int i;
 684
 685         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 686         for (i = 0; i < qp_info->snoop_table_size; i++) {
 687                 mad_snoop_priv = qp_info->snoop_table[i];
 688                 if (!mad_snoop_priv ||
 689                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 690                         continue;
 691
 692                 atomic_inc(&mad_snoop_priv->refcount);
 693                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 694                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 695                                                    mad_recv_wc);
 696                 deref_snoop_agent(mad_snoop_priv);
 697                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 698         }
 699         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 700 }
 701
 702 static void build_smp_wc(struct ib_qp *qp,
 703                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 704                          struct ib_wc *wc)
 705 {
 706         memset(wc, 0, sizeof *wc);
 707         wc->wr_id = wr_id;
 708         wc->status = IB_WC_SUCCESS;
 709         wc->opcode = IB_WC_RECV;
 710         wc->pkey_index = pkey_index;
 711         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 712         wc->src_qp = IB_QP0;
 713         wc->qp = qp;
 714         wc->slid = slid;
 715         wc->sl = 0;
 716         wc->dlid_path_bits = 0;
 717         wc->port_num = port_num;
 718 }
 719
 720 /*
 721  * Return 0 if SMP is to be sent
 722  * Return 1 if SMP was consumed locally (whether or not solicited)
 723  * Return < 0 if error
 724  */
 725 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 726                                   struct ib_mad_send_wr_private *mad_send_wr)
 727 {
 728         int ret = 0;
 729         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 730         unsigned long flags;
 731         struct ib_mad_local_private *local;
 732         struct ib_mad_private *mad_priv;
 733         struct ib_mad_port_private *port_priv;
 734         struct ib_mad_agent_private *recv_mad_agent = NULL;
 735         struct ib_device *device = mad_agent_priv->agent.device;
 736         u8 port_num;
 737         struct ib_wc mad_wc;
 738         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 739
 740         if (device->node_type == RDMA_NODE_IB_SWITCH &&
 741             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 742                 port_num = send_wr->wr.ud.port_num;
 743         else
 744                 port_num = mad_agent_priv->agent.port_num;
 745
 746         /*
 747          * Directed route handling starts if the initial LID routed part of
 748          * a request or the ending LID routed part of a response is empty.
 749          * If we are at the start of the LID routed part, don't update the
 750          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 751          */
 752         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 753              IB_LID_PERMISSIVE &&
 754              smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
 755              IB_SMI_DISCARD) {
 756                 ret = -EINVAL;
 757                 dev_err(&device->dev, "Invalid directed route\n");
 758                 goto out;
 759         }
 760
 761         /* Check to post send on QP or process locally */
 762         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 763             smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 764                 goto out;
 765
 766         local = kmalloc(sizeof *local, GFP_ATOMIC);
 767         if (!local) {
 768                 ret = -ENOMEM;
 769                 dev_err(&device->dev, "No memory for ib_mad_local_private\n");
 770                 goto out;
 771         }
 772         local->mad_priv = NULL;
 773         local->recv_mad_agent = NULL;
 774         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 775         if (!mad_priv) {
 776                 ret = -ENOMEM;
 777                 dev_err(&device->dev, "No memory for local response MAD\n");
 778                 kfree(local);
 779                 goto out;
 780         }
 781
 782         build_smp_wc(mad_agent_priv->agent.qp,
 783                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 784                      send_wr->wr.ud.pkey_index,
 785                      send_wr->wr.ud.port_num, &mad_wc);
 786
 787         /* No GRH for DR SMP */
 788         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 789                                   (struct ib_mad *)smp,
 790                                   (struct ib_mad *)&mad_priv->mad);
 791         switch (ret)
 792         {
 793         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 794                 if (ib_response_mad(&mad_priv->mad.mad) &&
 795                     mad_agent_priv->agent.recv_handler) {
 796                         local->mad_priv = mad_priv;
 797                         local->recv_mad_agent = mad_agent_priv;
 798                         /*
 799                          * Reference MAD agent until receive
 800                          * side of local completion handled
 801                          */
 802                         atomic_inc(&mad_agent_priv->refcount);
 803                 } else
 804                         kmem_cache_free(ib_mad_cache, mad_priv);
 805                 break;
 806         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 807                 kmem_cache_free(ib_mad_cache, mad_priv);
 808                 break;
 809         case IB_MAD_RESULT_SUCCESS:
 810                 /* Treat like an incoming receive MAD */
 811                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 812                                             mad_agent_priv->agent.port_num);
 813                 if (port_priv) {
 814                         memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
 815                         recv_mad_agent = find_mad_agent(port_priv,
 816                                                         &mad_priv->mad.mad);
 817                 }
 818                 if (!port_priv || !recv_mad_agent) {
 819                         /*
 820                          * No receiving agent so drop packet and
 821                          * generate send completion.
 822                          */
 823                         kmem_cache_free(ib_mad_cache, mad_priv);
 824                         break;
 825                 }
 826                 local->mad_priv = mad_priv;
 827                 local->recv_mad_agent = recv_mad_agent;
 828                 break;
 829         default:
 830                 kmem_cache_free(ib_mad_cache, mad_priv);
 831                 kfree(local);
 832                 ret = -EINVAL;
 833                 goto out;
 834         }
 835
 836         local->mad_send_wr = mad_send_wr;
 837         /* Reference MAD agent until send side of local completion handled */
 838         atomic_inc(&mad_agent_priv->refcount);
 839         /* Queue local completion to local list */
 840         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 841         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 842         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 843         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 844                    &mad_agent_priv->local_work);
 845         ret = 1;
 846 out:
 847         return ret;
 848 }
 849
 850 static int get_pad_size(int hdr_len, int data_len)
 851 {
 852         int seg_size, pad;
 853
 854         seg_size = sizeof(struct ib_mad) - hdr_len;
 855         if (data_len && seg_size) {
 856                 pad = seg_size - data_len % seg_size;
 857                 return pad == seg_size ? 0 : pad;
 858         } else
 859                 return seg_size;
 860 }
 861
 862 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 863 {
 864         struct ib_rmpp_segment *s, *t;
 865
 866         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 867                 list_del(&s->list);
 868                 kfree(s);
 869         }
 870 }
 871
 872 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 873                                 gfp_t gfp_mask)
 874 {
 875         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 876         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 877         struct ib_rmpp_segment *seg = NULL;
 878         int left, seg_size, pad;
 879
 880         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 881         seg_size = send_buf->seg_size;
 882         pad = send_wr->pad;
 883
 884         /* Allocate data segments. */
 885         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 886                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 887                 if (!seg) {
 888                         dev_err(&send_buf->mad_agent->device->dev,
 889                                 "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
 890                                 sizeof (*seg) + seg_size, gfp_mask);
 891                         free_send_rmpp_list(send_wr);
 892                         return -ENOMEM;
 893                 }
 894                 seg->num = ++send_buf->seg_count;
 895                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 896         }
 897
 898         /* Zero any padding */
 899         if (pad)
 900                 memset(seg->data + seg_size - pad, 0, pad);
 901
 902         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 903                                           agent.rmpp_version;
 904         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 905         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 906
 907         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 908                                         struct ib_rmpp_segment, list);
 909         send_wr->last_ack_seg = send_wr->cur_seg;
 910         return 0;
 911 }
 912
 913 int ib_mad_kernel_rmpp_agent(struct ib_mad_agent *agent)
 914 {
 915         return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
 916 }
 917 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
 918
 919 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 920                                             u32 remote_qpn, u16 pkey_index,
 921                                             int rmpp_active,
 922                                             int hdr_len, int data_len,
 923                                             gfp_t gfp_mask)
 924 {
 925         struct ib_mad_agent_private *mad_agent_priv;
 926         struct ib_mad_send_wr_private *mad_send_wr;
 927         int pad, message_size, ret, size;
 928         void *buf;
 929
 930         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 931                                       agent);
 932         pad = get_pad_size(hdr_len, data_len);
 933         message_size = hdr_len + data_len + pad;
 934
 935         if (ib_mad_kernel_rmpp_agent(mad_agent)) {
 936                 if (!rmpp_active && message_size > sizeof(struct ib_mad))
 937                         return ERR_PTR(-EINVAL);
 938         } else
 939                 if (rmpp_active || message_size > sizeof(struct ib_mad))
 940                         return ERR_PTR(-EINVAL);
 941
 942         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 943         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 944         if (!buf)
 945                 return ERR_PTR(-ENOMEM);
 946
 947         mad_send_wr = buf + size;
 948         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 949         mad_send_wr->send_buf.mad = buf;
 950         mad_send_wr->send_buf.hdr_len = hdr_len;
 951         mad_send_wr->send_buf.data_len = data_len;
 952         mad_send_wr->pad = pad;
 953
 954         mad_send_wr->mad_agent_priv = mad_agent_priv;
 955         mad_send_wr->sg_list[0].length = hdr_len;
 956         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 957         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 958         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 959
 960         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 961         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 962         mad_send_wr->send_wr.num_sge = 2;
 963         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 964         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 965         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 966         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 967         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 968
 969         if (rmpp_active) {
 970                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 971                 if (ret) {
 972                         kfree(buf);
 973                         return ERR_PTR(ret);
 974                 }
 975         }
 976
 977         mad_send_wr->send_buf.mad_agent = mad_agent;
 978         atomic_inc(&mad_agent_priv->refcount);
 979         return &mad_send_wr->send_buf;
 980 }
 981 EXPORT_SYMBOL(ib_create_send_mad);
 982
 983 int ib_get_mad_data_offset(u8 mgmt_class)
 984 {
 985         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 986                 return IB_MGMT_SA_HDR;
 987         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 988                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 989                  (mgmt_class == IB_MGMT_CLASS_BIS))
 990                 return IB_MGMT_DEVICE_HDR;
 991         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 992                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 993                 return IB_MGMT_VENDOR_HDR;
 994         else
 995                 return IB_MGMT_MAD_HDR;
 996 }
 997 EXPORT_SYMBOL(ib_get_mad_data_offset);
 998
 999 int ib_is_mad_class_rmpp(u8 mgmt_class)
1000 {
1001         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1002             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1003             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1004             (mgmt_class == IB_MGMT_CLASS_BIS) ||
1005             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1006              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1007                 return 1;
1008         return 0;
1009 }
1010 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1011
1012 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1013 {
1014         struct ib_mad_send_wr_private *mad_send_wr;
1015         struct list_head *list;
1016
1017         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1018                                    send_buf);
1019         list = &mad_send_wr->cur_seg->list;
1020
1021         if (mad_send_wr->cur_seg->num < seg_num) {
1022                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1023                         if (mad_send_wr->cur_seg->num == seg_num)
1024                                 break;
1025         } else if (mad_send_wr->cur_seg->num > seg_num) {
1026                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1027                         if (mad_send_wr->cur_seg->num == seg_num)
1028                                 break;
1029         }
1030         return mad_send_wr->cur_seg->data;
1031 }
1032 EXPORT_SYMBOL(ib_get_rmpp_segment);
1033
1034 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1035 {
1036         if (mad_send_wr->send_buf.seg_count)
1037                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1038                                            mad_send_wr->seg_num);
1039         else
1040                 return mad_send_wr->send_buf.mad +
1041                        mad_send_wr->send_buf.hdr_len;
1042 }
1043
1044 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1045 {
1046         struct ib_mad_agent_private *mad_agent_priv;
1047         struct ib_mad_send_wr_private *mad_send_wr;
1048
1049         mad_agent_priv = container_of(send_buf->mad_agent,
1050                                       struct ib_mad_agent_private, agent);
1051         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1052                                    send_buf);
1053
1054         free_send_rmpp_list(mad_send_wr);
1055         kfree(send_buf->mad);
1056         deref_mad_agent(mad_agent_priv);
1057 }
1058 EXPORT_SYMBOL(ib_free_send_mad);
1059
1060 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1061 {
1062         struct ib_mad_qp_info *qp_info;
1063         struct list_head *list;
1064         struct ib_send_wr *bad_send_wr;
1065         struct ib_mad_agent *mad_agent;
1066         struct ib_sge *sge;
1067         unsigned long flags;
1068         int ret;
1069
1070         /* Set WR ID to find mad_send_wr upon completion */
1071         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1072         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1073         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1074
1075         mad_agent = mad_send_wr->send_buf.mad_agent;
1076         sge = mad_send_wr->sg_list;
1077         sge[0].addr = ib_dma_map_single(mad_agent->device,
1078                                         mad_send_wr->send_buf.mad,
1079                                         sge[0].length,
1080                                         DMA_TO_DEVICE);
1081         if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1082                 return -ENOMEM;
1083
1084         mad_send_wr->header_mapping = sge[0].addr;
1085
1086         sge[1].addr = ib_dma_map_single(mad_agent->device,
1087                                         ib_get_payload(mad_send_wr),
1088                                         sge[1].length,
1089                                         DMA_TO_DEVICE);
1090         if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1091                 ib_dma_unmap_single(mad_agent->device,
1092                                     mad_send_wr->header_mapping,
1093                                     sge[0].length, DMA_TO_DEVICE);
1094                 return -ENOMEM;
1095         }
1096         mad_send_wr->payload_mapping = sge[1].addr;
1097
1098         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1099         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1100                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1101                                    &bad_send_wr);
1102                 list = &qp_info->send_queue.list;
1103         } else {
1104                 ret = 0;
1105                 list = &qp_info->overflow_list;
1106         }
1107
1108         if (!ret) {
1109                 qp_info->send_queue.count++;
1110                 list_add_tail(&mad_send_wr->mad_list.list, list);
1111         }
1112         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1113         if (ret) {
1114                 ib_dma_unmap_single(mad_agent->device,
1115                                     mad_send_wr->header_mapping,
1116                                     sge[0].length, DMA_TO_DEVICE);
1117                 ib_dma_unmap_single(mad_agent->device,
1118                                     mad_send_wr->payload_mapping,
1119                                     sge[1].length, DMA_TO_DEVICE);
1120         }
1121         return ret;
1122 }
1123
1124 /*
1125  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1126  *  with the registered client
1127  */
1128 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1129                      struct ib_mad_send_buf **bad_send_buf)
1130 {
1131         struct ib_mad_agent_private *mad_agent_priv;
1132         struct ib_mad_send_buf *next_send_buf;
1133         struct ib_mad_send_wr_private *mad_send_wr;
1134         unsigned long flags;
1135         int ret = -EINVAL;
1136
1137         /* Walk list of send WRs and post each on send list */
1138         for (; send_buf; send_buf = next_send_buf) {
1139
1140                 mad_send_wr = container_of(send_buf,
1141                                            struct ib_mad_send_wr_private,
1142                                            send_buf);
1143                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1144
1145                 if (!send_buf->mad_agent->send_handler ||
1146                     (send_buf->timeout_ms &&
1147                      !send_buf->mad_agent->recv_handler)) {
1148                         ret = -EINVAL;
1149                         goto error;
1150                 }
1151
1152                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1153                         if (mad_agent_priv->agent.rmpp_version) {
1154                                 ret = -EINVAL;
1155                                 goto error;
1156                         }
1157                 }
1158
1159                 /*
1160                  * Save pointer to next work request to post in case the
1161                  * current one completes, and the user modifies the work
1162                  * request associated with the completion
1163                  */
1164                 next_send_buf = send_buf->next;
1165                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1166
1167                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1168                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1169                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1170                                                      mad_send_wr);
1171                         if (ret < 0)            /* error */
1172                                 goto error;
1173                         else if (ret == 1)      /* locally consumed */
1174                                 continue;
1175                 }
1176
1177                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1178                 /* Timeout will be updated after send completes */
1179                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1180                 mad_send_wr->max_retries = send_buf->retries;
1181                 mad_send_wr->retries_left = send_buf->retries;
1182                 send_buf->retries = 0;
1183                 /* Reference for work request to QP + response */
1184                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1185                 mad_send_wr->status = IB_WC_SUCCESS;
1186
1187                 /* Reference MAD agent until send completes */
1188                 atomic_inc(&mad_agent_priv->refcount);
1189                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1190                 list_add_tail(&mad_send_wr->agent_list,
1191                               &mad_agent_priv->send_list);
1192                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1193
1194                 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1195                         ret = ib_send_rmpp_mad(mad_send_wr);
1196                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1197                                 ret = ib_send_mad(mad_send_wr);
1198                 } else
1199                         ret = ib_send_mad(mad_send_wr);
1200                 if (ret < 0) {
1201                         /* Fail send request */
1202                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1203                         list_del(&mad_send_wr->agent_list);
1204                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1205                         atomic_dec(&mad_agent_priv->refcount);
1206                         goto error;
1207                 }
1208         }
1209         return 0;
1210 error:
1211         if (bad_send_buf)
1212                 *bad_send_buf = send_buf;
1213         return ret;
1214 }
1215 EXPORT_SYMBOL(ib_post_send_mad);
1216
1217 /*
1218  * ib_free_recv_mad - Returns data buffers used to receive
1219  *  a MAD to the access layer
1220  */
1221 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1222 {
1223         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1224         struct ib_mad_private_header *mad_priv_hdr;
1225         struct ib_mad_private *priv;
1226         struct list_head free_list;
1227
1228         INIT_LIST_HEAD(&free_list);
1229         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1230
1231         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1232                                         &free_list, list) {
1233                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1234                                            recv_buf);
1235                 mad_priv_hdr = container_of(mad_recv_wc,
1236                                             struct ib_mad_private_header,
1237                                             recv_wc);
1238                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1239                                     header);
1240                 kmem_cache_free(ib_mad_cache, priv);
1241         }
1242 }
1243 EXPORT_SYMBOL(ib_free_recv_mad);
1244
1245 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1246                                         u8 rmpp_version,
1247                                         ib_mad_send_handler send_handler,
1248                                         ib_mad_recv_handler recv_handler,
1249                                         void *context)
1250 {
1251         return ERR_PTR(-EINVAL);        /* XXX: for now */
1252 }
1253 EXPORT_SYMBOL(ib_redirect_mad_qp);
1254
1255 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1256                       struct ib_wc *wc)
1257 {
1258         dev_err(&mad_agent->device->dev,
1259                 "ib_process_mad_wc() not implemented yet\n");
1260         return 0;
1261 }
1262 EXPORT_SYMBOL(ib_process_mad_wc);
1263
1264 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1265                          struct ib_mad_reg_req *mad_reg_req)
1266 {
1267         int i;
1268
1269         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1270                 if ((*method)->agent[i]) {
1271                         pr_err("Method %d already in use\n", i);
1272                         return -EINVAL;
1273                 }
1274         }
1275         return 0;
1276 }
1277
1278 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1279 {
1280         /* Allocate management method table */
1281         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1282         if (!*method) {
1283                 pr_err("No memory for ib_mad_mgmt_method_table\n");
1284                 return -ENOMEM;
1285         }
1286
1287         return 0;
1288 }
1289
1290 /*
1291  * Check to see if there are any methods still in use
1292  */
1293 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1294 {
1295         int i;
1296
1297         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1298                 if (method->agent[i])
1299                         return 1;
1300         return 0;
1301 }
1302
1303 /*
1304  * Check to see if there are any method tables for this class still in use
1305  */
1306 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1307 {
1308         int i;
1309
1310         for (i = 0; i < MAX_MGMT_CLASS; i++)
1311                 if (class->method_table[i])
1312                         return 1;
1313         return 0;
1314 }
1315
1316 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1317 {
1318         int i;
1319
1320         for (i = 0; i < MAX_MGMT_OUI; i++)
1321                 if (vendor_class->method_table[i])
1322                         return 1;
1323         return 0;
1324 }
1325
1326 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1327                            char *oui)
1328 {
1329         int i;
1330
1331         for (i = 0; i < MAX_MGMT_OUI; i++)
1332                 /* Is there matching OUI for this vendor class ? */
1333                 if (!memcmp(vendor_class->oui[i], oui, 3))
1334                         return i;
1335
1336         return -1;
1337 }
1338
1339 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1340 {
1341         int i;
1342
1343         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1344                 if (vendor->vendor_class[i])
1345                         return 1;
1346
1347         return 0;
1348 }
1349
1350 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1351                                      struct ib_mad_agent_private *agent)
1352 {
1353         int i;
1354
1355         /* Remove any methods for this mad agent */
1356         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1357                 if (method->agent[i] == agent) {
1358                         method->agent[i] = NULL;
1359                 }
1360         }
1361 }
1362
1363 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1364                               struct ib_mad_agent_private *agent_priv,
1365                               u8 mgmt_class)
1366 {
1367         struct ib_mad_port_private *port_priv;
1368         struct ib_mad_mgmt_class_table **class;
1369         struct ib_mad_mgmt_method_table **method;
1370         int i, ret;
1371
1372         port_priv = agent_priv->qp_info->port_priv;
1373         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1374         if (!*class) {
1375                 /* Allocate management class table for "new" class version */
1376                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1377                 if (!*class) {
1378                         dev_err(&agent_priv->agent.device->dev,
1379                                 "No memory for ib_mad_mgmt_class_table\n");
1380                         ret = -ENOMEM;
1381                         goto error1;
1382                 }
1383
1384                 /* Allocate method table for this management class */
1385                 method = &(*class)->method_table[mgmt_class];
1386                 if ((ret = allocate_method_table(method)))
1387                         goto error2;
1388         } else {
1389                 method = &(*class)->method_table[mgmt_class];
1390                 if (!*method) {
1391                         /* Allocate method table for this management class */
1392                         if ((ret = allocate_method_table(method)))
1393                                 goto error1;
1394                 }
1395         }
1396
1397         /* Now, make sure methods are not already in use */
1398         if (method_in_use(method, mad_reg_req))
1399                 goto error3;
1400
1401         /* Finally, add in methods being registered */
1402         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1403                 (*method)->agent[i] = agent_priv;
1404
1405         return 0;
1406
1407 error3:
1408         /* Remove any methods for this mad agent */
1409         remove_methods_mad_agent(*method, agent_priv);
1410         /* Now, check to see if there are any methods in use */
1411         if (!check_method_table(*method)) {
1412                 /* If not, release management method table */
1413                 kfree(*method);
1414                 *method = NULL;
1415         }
1416         ret = -EINVAL;
1417         goto error1;
1418 error2:
1419         kfree(*class);
1420         *class = NULL;
1421 error1:
1422         return ret;
1423 }
1424
1425 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1426                            struct ib_mad_agent_private *agent_priv)
1427 {
1428         struct ib_mad_port_private *port_priv;
1429         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1430         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1431         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1432         struct ib_mad_mgmt_method_table **method;
1433         int i, ret = -ENOMEM;
1434         u8 vclass;
1435
1436         /* "New" vendor (with OUI) class */
1437         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1438         port_priv = agent_priv->qp_info->port_priv;
1439         vendor_table = &port_priv->version[
1440                                 mad_reg_req->mgmt_class_version].vendor;
1441         if (!*vendor_table) {
1442                 /* Allocate mgmt vendor class table for "new" class version */
1443                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1444                 if (!vendor) {
1445                         dev_err(&agent_priv->agent.device->dev,
1446                                 "No memory for ib_mad_mgmt_vendor_class_table\n");
1447                         goto error1;
1448                 }
1449
1450                 *vendor_table = vendor;
1451         }
1452         if (!(*vendor_table)->vendor_class[vclass]) {
1453                 /* Allocate table for this management vendor class */
1454                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1455                 if (!vendor_class) {
1456                         dev_err(&agent_priv->agent.device->dev,
1457                                 "No memory for ib_mad_mgmt_vendor_class\n");
1458                         goto error2;
1459                 }
1460
1461                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1462         }
1463         for (i = 0; i < MAX_MGMT_OUI; i++) {
1464                 /* Is there matching OUI for this vendor class ? */
1465                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1466                             mad_reg_req->oui, 3)) {
1467                         method = &(*vendor_table)->vendor_class[
1468                                                 vclass]->method_table[i];
1469                         BUG_ON(!*method);
1470                         goto check_in_use;
1471                 }
1472         }
1473         for (i = 0; i < MAX_MGMT_OUI; i++) {
1474                 /* OUI slot available ? */
1475                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1476                                 vclass]->oui[i])) {
1477                         method = &(*vendor_table)->vendor_class[
1478                                 vclass]->method_table[i];
1479                         BUG_ON(*method);
1480                         /* Allocate method table for this OUI */
1481                         if ((ret = allocate_method_table(method)))
1482                                 goto error3;
1483                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1484                                mad_reg_req->oui, 3);
1485                         goto check_in_use;
1486                 }
1487         }
1488         dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1489         goto error3;
1490
1491 check_in_use:
1492         /* Now, make sure methods are not already in use */
1493         if (method_in_use(method, mad_reg_req))
1494                 goto error4;
1495
1496         /* Finally, add in methods being registered */
1497         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1498                 (*method)->agent[i] = agent_priv;
1499
1500         return 0;
1501
1502 error4:
1503         /* Remove any methods for this mad agent */
1504         remove_methods_mad_agent(*method, agent_priv);
1505         /* Now, check to see if there are any methods in use */
1506         if (!check_method_table(*method)) {
1507                 /* If not, release management method table */
1508                 kfree(*method);
1509                 *method = NULL;
1510         }
1511         ret = -EINVAL;
1512 error3:
1513         if (vendor_class) {
1514                 (*vendor_table)->vendor_class[vclass] = NULL;
1515                 kfree(vendor_class);
1516         }
1517 error2:
1518         if (vendor) {
1519                 *vendor_table = NULL;
1520                 kfree(vendor);
1521         }
1522 error1:
1523         return ret;
1524 }
1525
1526 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1527 {
1528         struct ib_mad_port_private *port_priv;
1529         struct ib_mad_mgmt_class_table *class;
1530         struct ib_mad_mgmt_method_table *method;
1531         struct ib_mad_mgmt_vendor_class_table *vendor;
1532         struct ib_mad_mgmt_vendor_class *vendor_class;
1533         int index;
1534         u8 mgmt_class;
1535
1536         /*
1537          * Was MAD registration request supplied
1538          * with original registration ?
1539          */
1540         if (!agent_priv->reg_req) {
1541                 goto out;
1542         }
1543
1544         port_priv = agent_priv->qp_info->port_priv;
1545         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1546         class = port_priv->version[
1547                         agent_priv->reg_req->mgmt_class_version].class;
1548         if (!class)
1549                 goto vendor_check;
1550
1551         method = class->method_table[mgmt_class];
1552         if (method) {
1553                 /* Remove any methods for this mad agent */
1554                 remove_methods_mad_agent(method, agent_priv);
1555                 /* Now, check to see if there are any methods still in use */
1556                 if (!check_method_table(method)) {
1557                         /* If not, release management method table */
1558                          kfree(method);
1559                          class->method_table[mgmt_class] = NULL;
1560                          /* Any management classes left ? */
1561                         if (!check_class_table(class)) {
1562                                 /* If not, release management class table */
1563                                 kfree(class);
1564                                 port_priv->version[
1565                                         agent_priv->reg_req->
1566                                         mgmt_class_version].class = NULL;
1567                         }
1568                 }
1569         }
1570
1571 vendor_check:
1572         if (!is_vendor_class(mgmt_class))
1573                 goto out;
1574
1575         /* normalize mgmt_class to vendor range 2 */
1576         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1577         vendor = port_priv->version[
1578                         agent_priv->reg_req->mgmt_class_version].vendor;
1579
1580         if (!vendor)
1581                 goto out;
1582
1583         vendor_class = vendor->vendor_class[mgmt_class];
1584         if (vendor_class) {
1585                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1586                 if (index < 0)
1587                         goto out;
1588                 method = vendor_class->method_table[index];
1589                 if (method) {
1590                         /* Remove any methods for this mad agent */
1591                         remove_methods_mad_agent(method, agent_priv);
1592                         /*
1593                          * Now, check to see if there are
1594                          * any methods still in use
1595                          */
1596                         if (!check_method_table(method)) {
1597                                 /* If not, release management method table */
1598                                 kfree(method);
1599                                 vendor_class->method_table[index] = NULL;
1600                                 memset(vendor_class->oui[index], 0, 3);
1601                                 /* Any OUIs left ? */
1602                                 if (!check_vendor_class(vendor_class)) {
1603                                         /* If not, release vendor class table */
1604                                         kfree(vendor_class);
1605                                         vendor->vendor_class[mgmt_class] = NULL;
1606                                         /* Any other vendor classes left ? */
1607                                         if (!check_vendor_table(vendor)) {
1608                                                 kfree(vendor);
1609                                                 port_priv->version[
1610                                                         agent_priv->reg_req->
1611                                                         mgmt_class_version].
1612                                                         vendor = NULL;
1613                                         }
1614                                 }
1615                         }
1616                 }
1617         }
1618
1619 out:
1620         return;
1621 }
1622
1623 static struct ib_mad_agent_private *
1624 find_mad_agent(struct ib_mad_port_private *port_priv,
1625                struct ib_mad *mad)
1626 {
1627         struct ib_mad_agent_private *mad_agent = NULL;
1628         unsigned long flags;
1629
1630         spin_lock_irqsave(&port_priv->reg_lock, flags);
1631         if (ib_response_mad(mad)) {
1632                 u32 hi_tid;
1633                 struct ib_mad_agent_private *entry;
1634
1635                 /*
1636                  * Routing is based on high 32 bits of transaction ID
1637                  * of MAD.
1638                  */
1639                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1640                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1641                         if (entry->agent.hi_tid == hi_tid) {
1642                                 mad_agent = entry;
1643                                 break;
1644                         }
1645                 }
1646         } else {
1647                 struct ib_mad_mgmt_class_table *class;
1648                 struct ib_mad_mgmt_method_table *method;
1649                 struct ib_mad_mgmt_vendor_class_table *vendor;
1650                 struct ib_mad_mgmt_vendor_class *vendor_class;
1651                 struct ib_vendor_mad *vendor_mad;
1652                 int index;
1653
1654                 /*
1655                  * Routing is based on version, class, and method
1656                  * For "newer" vendor MADs, also based on OUI
1657                  */
1658                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1659                         goto out;
1660                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1661                         class = port_priv->version[
1662                                         mad->mad_hdr.class_version].class;
1663                         if (!class)
1664                                 goto out;
1665                         if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
1666                             IB_MGMT_MAX_METHODS)
1667                                 goto out;
1668                         method = class->method_table[convert_mgmt_class(
1669                                                         mad->mad_hdr.mgmt_class)];
1670                         if (method)
1671                                 mad_agent = method->agent[mad->mad_hdr.method &
1672                                                           ~IB_MGMT_METHOD_RESP];
1673                 } else {
1674                         vendor = port_priv->version[
1675                                         mad->mad_hdr.class_version].vendor;
1676                         if (!vendor)
1677                                 goto out;
1678                         vendor_class = vendor->vendor_class[vendor_class_index(
1679                                                 mad->mad_hdr.mgmt_class)];
1680                         if (!vendor_class)
1681                                 goto out;
1682                         /* Find matching OUI */
1683                         vendor_mad = (struct ib_vendor_mad *)mad;
1684                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1685                         if (index == -1)
1686                                 goto out;
1687                         method = vendor_class->method_table[index];
1688                         if (method) {
1689                                 mad_agent = method->agent[mad->mad_hdr.method &
1690                                                           ~IB_MGMT_METHOD_RESP];
1691                         }
1692                 }
1693         }
1694
1695         if (mad_agent) {
1696                 if (mad_agent->agent.recv_handler)
1697                         atomic_inc(&mad_agent->refcount);
1698                 else {
1699                         dev_notice(&port_priv->device->dev,
1700                                    "No receive handler for client %p on port %d\n",
1701                                    &mad_agent->agent, port_priv->port_num);
1702                         mad_agent = NULL;
1703                 }
1704         }
1705 out:
1706         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1707
1708         return mad_agent;
1709 }
1710
1711 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1712 {
1713         int valid = 0;
1714
1715         /* Make sure MAD base version is understood */
1716         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1717                 pr_err("MAD received with unsupported base version %d\n",
1718                         mad->mad_hdr.base_version);
1719                 goto out;
1720         }
1721
1722         /* Filter SMI packets sent to other than QP0 */
1723         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1724             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1725                 if (qp_num == 0)
1726                         valid = 1;
1727         } else {
1728                 /* Filter GSI packets sent to QP0 */
1729                 if (qp_num != 0)
1730                         valid = 1;
1731         }
1732
1733 out:
1734         return valid;
1735 }
1736
1737 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1738                        struct ib_mad_hdr *mad_hdr)
1739 {
1740         struct ib_rmpp_mad *rmpp_mad;
1741
1742         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1743         return !mad_agent_priv->agent.rmpp_version ||
1744                 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1745                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1746                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1747                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1748 }
1749
1750 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1751                                      struct ib_mad_recv_wc *rwc)
1752 {
1753         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1754                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1755 }
1756
1757 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1758                                    struct ib_mad_send_wr_private *wr,
1759                                    struct ib_mad_recv_wc *rwc )
1760 {
1761         struct ib_ah_attr attr;
1762         u8 send_resp, rcv_resp;
1763         union ib_gid sgid;
1764         struct ib_device *device = mad_agent_priv->agent.device;
1765         u8 port_num = mad_agent_priv->agent.port_num;
1766         u8 lmc;
1767
1768         send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1769         rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1770
1771         if (send_resp == rcv_resp)
1772                 /* both requests, or both responses. GIDs different */
1773                 return 0;
1774
1775         if (ib_query_ah(wr->send_buf.ah, &attr))
1776                 /* Assume not equal, to avoid false positives. */
1777                 return 0;
1778
1779         if (!!(attr.ah_flags & IB_AH_GRH) !=
1780             !!(rwc->wc->wc_flags & IB_WC_GRH))
1781                 /* one has GID, other does not.  Assume different */
1782                 return 0;
1783
1784         if (!send_resp && rcv_resp) {
1785                 /* is request/response. */
1786                 if (!(attr.ah_flags & IB_AH_GRH)) {
1787                         if (ib_get_cached_lmc(device, port_num, &lmc))
1788                                 return 0;
1789                         return (!lmc || !((attr.src_path_bits ^
1790                                            rwc->wc->dlid_path_bits) &
1791                                           ((1 << lmc) - 1)));
1792                 } else {
1793                         if (ib_get_cached_gid(device, port_num,
1794                                               attr.grh.sgid_index, &sgid))
1795                                 return 0;
1796                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1797                                        16);
1798                 }
1799         }
1800
1801         if (!(attr.ah_flags & IB_AH_GRH))
1802                 return attr.dlid == rwc->wc->slid;
1803         else
1804                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1805                                16);
1806 }
1807
1808 static inline int is_direct(u8 class)
1809 {
1810         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1811 }
1812
1813 struct ib_mad_send_wr_private*
1814 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1815                  struct ib_mad_recv_wc *wc)
1816 {
1817         struct ib_mad_send_wr_private *wr;
1818         struct ib_mad *mad;
1819
1820         mad = (struct ib_mad *)wc->recv_buf.mad;
1821
1822         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1823                 if ((wr->tid == mad->mad_hdr.tid) &&
1824                     rcv_has_same_class(wr, wc) &&
1825                     /*
1826                      * Don't check GID for direct routed MADs.
1827                      * These might have permissive LIDs.
1828                      */
1829                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1830                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1831                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1832         }
1833
1834         /*
1835          * It's possible to receive the response before we've
1836          * been notified that the send has completed
1837          */
1838         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1839                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1840                     wr->tid == mad->mad_hdr.tid &&
1841                     wr->timeout &&
1842                     rcv_has_same_class(wr, wc) &&
1843                     /*
1844                      * Don't check GID for direct routed MADs.
1845                      * These might have permissive LIDs.
1846                      */
1847                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1848                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1849                         /* Verify request has not been canceled */
1850                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1851         }
1852         return NULL;
1853 }
1854
1855 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1856 {
1857         mad_send_wr->timeout = 0;
1858         if (mad_send_wr->refcount == 1)
1859                 list_move_tail(&mad_send_wr->agent_list,
1860                               &mad_send_wr->mad_agent_priv->done_list);
1861 }
1862
1863 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1864                                  struct ib_mad_recv_wc *mad_recv_wc)
1865 {
1866         struct ib_mad_send_wr_private *mad_send_wr;
1867         struct ib_mad_send_wc mad_send_wc;
1868         unsigned long flags;
1869
1870         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1871         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1872         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1873                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1874                                                       mad_recv_wc);
1875                 if (!mad_recv_wc) {
1876                         deref_mad_agent(mad_agent_priv);
1877                         return;
1878                 }
1879         }
1880
1881         /* Complete corresponding request */
1882         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1883                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1884                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1885                 if (!mad_send_wr) {
1886                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1887                         if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1888                            && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1889                            && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1890                                         & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1891                                 /* user rmpp is in effect
1892                                  * and this is an active RMPP MAD
1893                                  */
1894                                 mad_recv_wc->wc->wr_id = 0;
1895                                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1896                                                                    mad_recv_wc);
1897                                 atomic_dec(&mad_agent_priv->refcount);
1898                         } else {
1899                                 /* not user rmpp, revert to normal behavior and
1900                                  * drop the mad */
1901                                 ib_free_recv_mad(mad_recv_wc);
1902                                 deref_mad_agent(mad_agent_priv);
1903                                 return;
1904                         }
1905                 } else {
1906                         ib_mark_mad_done(mad_send_wr);
1907                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1908
1909                         /* Defined behavior is to complete response before request */
1910                         mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1911                         mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1912                                                            mad_recv_wc);
1913                         atomic_dec(&mad_agent_priv->refcount);
1914
1915                         mad_send_wc.status = IB_WC_SUCCESS;
1916                         mad_send_wc.vendor_err = 0;
1917                         mad_send_wc.send_buf = &mad_send_wr->send_buf;
1918                         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1919                 }
1920         } else {
1921                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1922                                                    mad_recv_wc);
1923                 deref_mad_agent(mad_agent_priv);
1924         }
1925 }
1926
1927 static bool generate_unmatched_resp(struct ib_mad_private *recv,
1928                                     struct ib_mad_private *response)
1929 {
1930         if (recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_GET ||
1931             recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_SET) {
1932                 memcpy(response, recv, sizeof *response);
1933                 response->header.recv_wc.wc = &response->header.wc;
1934                 response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1935                 response->header.recv_wc.recv_buf.grh = &response->grh;
1936                 response->mad.mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
1937                 response->mad.mad.mad_hdr.status =
1938                         cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1939                 if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1940                         response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION;
1941
1942                 return true;
1943         } else {
1944                 return false;
1945         }
1946 }
1947 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1948                                      struct ib_wc *wc)
1949 {
1950         struct ib_mad_qp_info *qp_info;
1951         struct ib_mad_private_header *mad_priv_hdr;
1952         struct ib_mad_private *recv, *response = NULL;
1953         struct ib_mad_list_head *mad_list;
1954         struct ib_mad_agent_private *mad_agent;
1955         int port_num;
1956         int ret = IB_MAD_RESULT_SUCCESS;
1957
1958         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1959         qp_info = mad_list->mad_queue->qp_info;
1960         dequeue_mad(mad_list);
1961
1962         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1963                                     mad_list);
1964         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1965         ib_dma_unmap_single(port_priv->device,
1966                             recv->header.mapping,
1967                             sizeof(struct ib_mad_private) -
1968                               sizeof(struct ib_mad_private_header),
1969                             DMA_FROM_DEVICE);
1970
1971         /* Setup MAD receive work completion from "normal" work completion */
1972         recv->header.wc = *wc;
1973         recv->header.recv_wc.wc = &recv->header.wc;
1974         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1975         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1976         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1977
1978         if (atomic_read(&qp_info->snoop_count))
1979                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1980
1981         /* Validate MAD */
1982         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1983                 goto out;
1984
1985         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1986         if (!response) {
1987                 dev_err(&port_priv->device->dev,
1988                         "ib_mad_recv_done_handler no memory for response buffer\n");
1989                 goto out;
1990         }
1991
1992         if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1993                 port_num = wc->port_num;
1994         else
1995                 port_num = port_priv->port_num;
1996
1997         if (recv->mad.mad.mad_hdr.mgmt_class ==
1998             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1999                 enum smi_forward_action retsmi;
2000
2001                 if (smi_handle_dr_smp_recv(&recv->mad.smp,
2002                                            port_priv->device->node_type,
2003                                            port_num,
2004                                            port_priv->device->phys_port_cnt) ==
2005                                            IB_SMI_DISCARD)
2006                         goto out;
2007
2008                 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
2009                 if (retsmi == IB_SMI_LOCAL)
2010                         goto local;
2011
2012                 if (retsmi == IB_SMI_SEND) { /* don't forward */
2013                         if (smi_handle_dr_smp_send(&recv->mad.smp,
2014                                                    port_priv->device->node_type,
2015                                                    port_num) == IB_SMI_DISCARD)
2016                                 goto out;
2017
2018                         if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
2019                                 goto out;
2020                 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
2021                         /* forward case for switches */
2022                         memcpy(response, recv, sizeof(*response));
2023                         response->header.recv_wc.wc = &response->header.wc;
2024                         response->header.recv_wc.recv_buf.mad = &response->mad.mad;
2025                         response->header.recv_wc.recv_buf.grh = &response->grh;
2026
2027                         agent_send_response(&response->mad.mad,
2028                                             &response->grh, wc,
2029                                             port_priv->device,
2030                                             smi_get_fwd_port(&recv->mad.smp),
2031                                             qp_info->qp->qp_num);
2032
2033                         goto out;
2034                 }
2035         }
2036
2037 local:
2038         /* Give driver "right of first refusal" on incoming MAD */
2039         if (port_priv->device->process_mad) {
2040                 ret = port_priv->device->process_mad(port_priv->device, 0,
2041                                                      port_priv->port_num,
2042                                                      wc, &recv->grh,
2043                                                      &recv->mad.mad,
2044                                                      &response->mad.mad);
2045                 if (ret & IB_MAD_RESULT_SUCCESS) {
2046                         if (ret & IB_MAD_RESULT_CONSUMED)
2047                                 goto out;
2048                         if (ret & IB_MAD_RESULT_REPLY) {
2049                                 agent_send_response(&response->mad.mad,
2050                                                     &recv->grh, wc,
2051                                                     port_priv->device,
2052                                                     port_num,
2053                                                     qp_info->qp->qp_num);
2054                                 goto out;
2055                         }
2056                 }
2057         }
2058
2059         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
2060         if (mad_agent) {
2061                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2062                 /*
2063                  * recv is freed up in error cases in ib_mad_complete_recv
2064                  * or via recv_handler in ib_mad_complete_recv()
2065                  */
2066                 recv = NULL;
2067         } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2068                    generate_unmatched_resp(recv, response)) {
2069                 agent_send_response(&response->mad.mad, &recv->grh, wc,
2070                                     port_priv->device, port_num, qp_info->qp->qp_num);
2071         }
2072
2073 out:
2074         /* Post another receive request for this QP */
2075         if (response) {
2076                 ib_mad_post_receive_mads(qp_info, response);
2077                 if (recv)
2078                         kmem_cache_free(ib_mad_cache, recv);
2079         } else
2080                 ib_mad_post_receive_mads(qp_info, recv);
2081 }
2082
2083 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2084 {
2085         struct ib_mad_send_wr_private *mad_send_wr;
2086         unsigned long delay;
2087
2088         if (list_empty(&mad_agent_priv->wait_list)) {
2089                 cancel_delayed_work(&mad_agent_priv->timed_work);
2090         } else {
2091                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2092                                          struct ib_mad_send_wr_private,
2093                                          agent_list);
2094
2095                 if (time_after(mad_agent_priv->timeout,
2096                                mad_send_wr->timeout)) {
2097                         mad_agent_priv->timeout = mad_send_wr->timeout;
2098                         delay = mad_send_wr->timeout - jiffies;
2099                         if ((long)delay <= 0)
2100                                 delay = 1;
2101                         mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2102                                          &mad_agent_priv->timed_work, delay);
2103                 }
2104         }
2105 }
2106
2107 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2108 {
2109         struct ib_mad_agent_private *mad_agent_priv;
2110         struct ib_mad_send_wr_private *temp_mad_send_wr;
2111         struct list_head *list_item;
2112         unsigned long delay;
2113
2114         mad_agent_priv = mad_send_wr->mad_agent_priv;
2115         list_del(&mad_send_wr->agent_list);
2116
2117         delay = mad_send_wr->timeout;
2118         mad_send_wr->timeout += jiffies;
2119
2120         if (delay) {
2121                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2122                         temp_mad_send_wr = list_entry(list_item,
2123                                                 struct ib_mad_send_wr_private,
2124                                                 agent_list);
2125                         if (time_after(mad_send_wr->timeout,
2126                                        temp_mad_send_wr->timeout))
2127                                 break;
2128                 }
2129         }
2130         else
2131                 list_item = &mad_agent_priv->wait_list;
2132         list_add(&mad_send_wr->agent_list, list_item);
2133
2134         /* Reschedule a work item if we have a shorter timeout */
2135         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2136                 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2137                                  &mad_agent_priv->timed_work, delay);
2138 }
2139
2140 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2141                           int timeout_ms)
2142 {
2143         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2144         wait_for_response(mad_send_wr);
2145 }
2146
2147 /*
2148  * Process a send work completion
2149  */
2150 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2151                              struct ib_mad_send_wc *mad_send_wc)
2152 {
2153         struct ib_mad_agent_private     *mad_agent_priv;
2154         unsigned long                   flags;
2155         int                             ret;
2156
2157         mad_agent_priv = mad_send_wr->mad_agent_priv;
2158         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2159         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2160                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2161                 if (ret == IB_RMPP_RESULT_CONSUMED)
2162                         goto done;
2163         } else
2164                 ret = IB_RMPP_RESULT_UNHANDLED;
2165
2166         if (mad_send_wc->status != IB_WC_SUCCESS &&
2167             mad_send_wr->status == IB_WC_SUCCESS) {
2168                 mad_send_wr->status = mad_send_wc->status;
2169                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2170         }
2171
2172         if (--mad_send_wr->refcount > 0) {
2173                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2174                     mad_send_wr->status == IB_WC_SUCCESS) {
2175                         wait_for_response(mad_send_wr);
2176                 }
2177                 goto done;
2178         }
2179
2180         /* Remove send from MAD agent and notify client of completion */
2181         list_del(&mad_send_wr->agent_list);
2182         adjust_timeout(mad_agent_priv);
2183         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2184
2185         if (mad_send_wr->status != IB_WC_SUCCESS )
2186                 mad_send_wc->status = mad_send_wr->status;
2187         if (ret == IB_RMPP_RESULT_INTERNAL)
2188                 ib_rmpp_send_handler(mad_send_wc);
2189         else
2190                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2191                                                    mad_send_wc);
2192
2193         /* Release reference on agent taken when sending */
2194         deref_mad_agent(mad_agent_priv);
2195         return;
2196 done:
2197         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2198 }
2199
2200 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2201                                      struct ib_wc *wc)
2202 {
2203         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2204         struct ib_mad_list_head         *mad_list;
2205         struct ib_mad_qp_info           *qp_info;
2206         struct ib_mad_queue             *send_queue;
2207         struct ib_send_wr               *bad_send_wr;
2208         struct ib_mad_send_wc           mad_send_wc;
2209         unsigned long flags;
2210         int ret;
2211
2212         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2213         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2214                                    mad_list);
2215         send_queue = mad_list->mad_queue;
2216         qp_info = send_queue->qp_info;
2217
2218 retry:
2219         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2220                             mad_send_wr->header_mapping,
2221                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2222         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2223                             mad_send_wr->payload_mapping,
2224                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2225         queued_send_wr = NULL;
2226         spin_lock_irqsave(&send_queue->lock, flags);
2227         list_del(&mad_list->list);
2228
2229         /* Move queued send to the send queue */
2230         if (send_queue->count-- > send_queue->max_active) {
2231                 mad_list = container_of(qp_info->overflow_list.next,
2232                                         struct ib_mad_list_head, list);
2233                 queued_send_wr = container_of(mad_list,
2234                                         struct ib_mad_send_wr_private,
2235                                         mad_list);
2236                 list_move_tail(&mad_list->list, &send_queue->list);
2237         }
2238         spin_unlock_irqrestore(&send_queue->lock, flags);
2239
2240         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2241         mad_send_wc.status = wc->status;
2242         mad_send_wc.vendor_err = wc->vendor_err;
2243         if (atomic_read(&qp_info->snoop_count))
2244                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2245                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2246         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2247
2248         if (queued_send_wr) {
2249                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2250                                    &bad_send_wr);
2251                 if (ret) {
2252                         dev_err(&port_priv->device->dev,
2253                                 "ib_post_send failed: %d\n", ret);
2254                         mad_send_wr = queued_send_wr;
2255                         wc->status = IB_WC_LOC_QP_OP_ERR;
2256                         goto retry;
2257                 }
2258         }
2259 }
2260
2261 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2262 {
2263         struct ib_mad_send_wr_private *mad_send_wr;
2264         struct ib_mad_list_head *mad_list;
2265         unsigned long flags;
2266
2267         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2268         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2269                 mad_send_wr = container_of(mad_list,
2270                                            struct ib_mad_send_wr_private,
2271                                            mad_list);
2272                 mad_send_wr->retry = 1;
2273         }
2274         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2275 }
2276
2277 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2278                               struct ib_wc *wc)
2279 {
2280         struct ib_mad_list_head *mad_list;
2281         struct ib_mad_qp_info *qp_info;
2282         struct ib_mad_send_wr_private *mad_send_wr;
2283         int ret;
2284
2285         /* Determine if failure was a send or receive */
2286         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2287         qp_info = mad_list->mad_queue->qp_info;
2288         if (mad_list->mad_queue == &qp_info->recv_queue)
2289                 /*
2290                  * Receive errors indicate that the QP has entered the error
2291                  * state - error handling/shutdown code will cleanup
2292                  */
2293                 return;
2294
2295         /*
2296          * Send errors will transition the QP to SQE - move
2297          * QP to RTS and repost flushed work requests
2298          */
2299         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2300                                    mad_list);
2301         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2302                 if (mad_send_wr->retry) {
2303                         /* Repost send */
2304                         struct ib_send_wr *bad_send_wr;
2305
2306                         mad_send_wr->retry = 0;
2307                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2308                                         &bad_send_wr);
2309                         if (ret)
2310                                 ib_mad_send_done_handler(port_priv, wc);
2311                 } else
2312                         ib_mad_send_done_handler(port_priv, wc);
2313         } else {
2314                 struct ib_qp_attr *attr;
2315
2316                 /* Transition QP to RTS and fail offending send */
2317                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2318                 if (attr) {
2319                         attr->qp_state = IB_QPS_RTS;
2320                         attr->cur_qp_state = IB_QPS_SQE;
2321                         ret = ib_modify_qp(qp_info->qp, attr,
2322                                            IB_QP_STATE | IB_QP_CUR_STATE);
2323                         kfree(attr);
2324                         if (ret)
2325                                 dev_err(&port_priv->device->dev,
2326                                         "mad_error_handler - ib_modify_qp to RTS : %d\n",
2327                                         ret);
2328                         else
2329                                 mark_sends_for_retry(qp_info);
2330                 }
2331                 ib_mad_send_done_handler(port_priv, wc);
2332         }
2333 }
2334
2335 /*
2336  * IB MAD completion callback
2337  */
2338 static void ib_mad_completion_handler(struct work_struct *work)
2339 {
2340         struct ib_mad_port_private *port_priv;
2341         struct ib_wc wc;
2342
2343         port_priv = container_of(work, struct ib_mad_port_private, work);
2344         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2345
2346         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2347                 if (wc.status == IB_WC_SUCCESS) {
2348                         switch (wc.opcode) {
2349                         case IB_WC_SEND:
2350                                 ib_mad_send_done_handler(port_priv, &wc);
2351                                 break;
2352                         case IB_WC_RECV:
2353                                 ib_mad_recv_done_handler(port_priv, &wc);
2354                                 break;
2355                         default:
2356                                 BUG_ON(1);
2357                                 break;
2358                         }
2359                 } else
2360                         mad_error_handler(port_priv, &wc);
2361         }
2362 }
2363
2364 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2365 {
2366         unsigned long flags;
2367         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2368         struct ib_mad_send_wc mad_send_wc;
2369         struct list_head cancel_list;
2370
2371         INIT_LIST_HEAD(&cancel_list);
2372
2373         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2374         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2375                                  &mad_agent_priv->send_list, agent_list) {
2376                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2377                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2378                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2379                 }
2380         }
2381
2382         /* Empty wait list to prevent receives from finding a request */
2383         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2384         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2385
2386         /* Report all cancelled requests */
2387         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2388         mad_send_wc.vendor_err = 0;
2389
2390         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2391                                  &cancel_list, agent_list) {
2392                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2393                 list_del(&mad_send_wr->agent_list);
2394                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2395                                                    &mad_send_wc);
2396                 atomic_dec(&mad_agent_priv->refcount);
2397         }
2398 }
2399
2400 static struct ib_mad_send_wr_private*
2401 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2402              struct ib_mad_send_buf *send_buf)
2403 {
2404         struct ib_mad_send_wr_private *mad_send_wr;
2405
2406         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2407                             agent_list) {
2408                 if (&mad_send_wr->send_buf == send_buf)
2409                         return mad_send_wr;
2410         }
2411
2412         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2413                             agent_list) {
2414                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2415                     &mad_send_wr->send_buf == send_buf)
2416                         return mad_send_wr;
2417         }
2418         return NULL;
2419 }
2420
2421 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2422                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2423 {
2424         struct ib_mad_agent_private *mad_agent_priv;
2425         struct ib_mad_send_wr_private *mad_send_wr;
2426         unsigned long flags;
2427         int active;
2428
2429         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2430                                       agent);
2431         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2432         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2433         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2434                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2435                 return -EINVAL;
2436         }
2437
2438         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2439         if (!timeout_ms) {
2440                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2441                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2442         }
2443
2444         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2445         if (active)
2446                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2447         else
2448                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2449
2450         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2451         return 0;
2452 }
2453 EXPORT_SYMBOL(ib_modify_mad);
2454
2455 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2456                    struct ib_mad_send_buf *send_buf)
2457 {
2458         ib_modify_mad(mad_agent, send_buf, 0);
2459 }
2460 EXPORT_SYMBOL(ib_cancel_mad);
2461
2462 static void local_completions(struct work_struct *work)
2463 {
2464         struct ib_mad_agent_private *mad_agent_priv;
2465         struct ib_mad_local_private *local;
2466         struct ib_mad_agent_private *recv_mad_agent;
2467         unsigned long flags;
2468         int free_mad;
2469         struct ib_wc wc;
2470         struct ib_mad_send_wc mad_send_wc;
2471
2472         mad_agent_priv =
2473                 container_of(work, struct ib_mad_agent_private, local_work);
2474
2475         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2476         while (!list_empty(&mad_agent_priv->local_list)) {
2477                 local = list_entry(mad_agent_priv->local_list.next,
2478                                    struct ib_mad_local_private,
2479                                    completion_list);
2480                 list_del(&local->completion_list);
2481                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2482                 free_mad = 0;
2483                 if (local->mad_priv) {
2484                         recv_mad_agent = local->recv_mad_agent;
2485                         if (!recv_mad_agent) {
2486                                 dev_err(&mad_agent_priv->agent.device->dev,
2487                                         "No receive MAD agent for local completion\n");
2488                                 free_mad = 1;
2489                                 goto local_send_completion;
2490                         }
2491
2492                         /*
2493                          * Defined behavior is to complete response
2494                          * before request
2495                          */
2496                         build_smp_wc(recv_mad_agent->agent.qp,
2497                                      (unsigned long) local->mad_send_wr,
2498                                      be16_to_cpu(IB_LID_PERMISSIVE),
2499                                      0, recv_mad_agent->agent.port_num, &wc);
2500
2501                         local->mad_priv->header.recv_wc.wc = &wc;
2502                         local->mad_priv->header.recv_wc.mad_len =
2503                                                 sizeof(struct ib_mad);
2504                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2505                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2506                                  &local->mad_priv->header.recv_wc.rmpp_list);
2507                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2508                         local->mad_priv->header.recv_wc.recv_buf.mad =
2509                                                 &local->mad_priv->mad.mad;
2510                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2511                                 snoop_recv(recv_mad_agent->qp_info,
2512                                           &local->mad_priv->header.recv_wc,
2513                                            IB_MAD_SNOOP_RECVS);
2514                         recv_mad_agent->agent.recv_handler(
2515                                                 &recv_mad_agent->agent,
2516                                                 &local->mad_priv->header.recv_wc);
2517                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2518                         atomic_dec(&recv_mad_agent->refcount);
2519                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2520                 }
2521
2522 local_send_completion:
2523                 /* Complete send */
2524                 mad_send_wc.status = IB_WC_SUCCESS;
2525                 mad_send_wc.vendor_err = 0;
2526                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2527                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2528                         snoop_send(mad_agent_priv->qp_info,
2529                                    &local->mad_send_wr->send_buf,
2530                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2531                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2532                                                    &mad_send_wc);
2533
2534                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2535                 atomic_dec(&mad_agent_priv->refcount);
2536                 if (free_mad)
2537                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2538                 kfree(local);
2539         }
2540         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2541 }
2542
2543 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2544 {
2545         int ret;
2546
2547         if (!mad_send_wr->retries_left)
2548                 return -ETIMEDOUT;
2549
2550         mad_send_wr->retries_left--;
2551         mad_send_wr->send_buf.retries++;
2552
2553         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2554
2555         if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2556                 ret = ib_retry_rmpp(mad_send_wr);
2557                 switch (ret) {
2558                 case IB_RMPP_RESULT_UNHANDLED:
2559                         ret = ib_send_mad(mad_send_wr);
2560                         break;
2561                 case IB_RMPP_RESULT_CONSUMED:
2562                         ret = 0;
2563                         break;
2564                 default:
2565                         ret = -ECOMM;
2566                         break;
2567                 }
2568         } else
2569                 ret = ib_send_mad(mad_send_wr);
2570
2571         if (!ret) {
2572                 mad_send_wr->refcount++;
2573                 list_add_tail(&mad_send_wr->agent_list,
2574                               &mad_send_wr->mad_agent_priv->send_list);
2575         }
2576         return ret;
2577 }
2578
2579 static void timeout_sends(struct work_struct *work)
2580 {
2581         struct ib_mad_agent_private *mad_agent_priv;
2582         struct ib_mad_send_wr_private *mad_send_wr;
2583         struct ib_mad_send_wc mad_send_wc;
2584         unsigned long flags, delay;
2585
2586         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2587                                       timed_work.work);
2588         mad_send_wc.vendor_err = 0;
2589
2590         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2591         while (!list_empty(&mad_agent_priv->wait_list)) {
2592                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2593                                          struct ib_mad_send_wr_private,
2594                                          agent_list);
2595
2596                 if (time_after(mad_send_wr->timeout, jiffies)) {
2597                         delay = mad_send_wr->timeout - jiffies;
2598                         if ((long)delay <= 0)
2599                                 delay = 1;
2600                         queue_delayed_work(mad_agent_priv->qp_info->
2601                                            port_priv->wq,
2602                                            &mad_agent_priv->timed_work, delay);
2603                         break;
2604                 }
2605
2606                 list_del(&mad_send_wr->agent_list);
2607                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2608                     !retry_send(mad_send_wr))
2609                         continue;
2610
2611                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2612
2613                 if (mad_send_wr->status == IB_WC_SUCCESS)
2614                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2615                 else
2616                         mad_send_wc.status = mad_send_wr->status;
2617                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2618                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2619                                                    &mad_send_wc);
2620
2621                 atomic_dec(&mad_agent_priv->refcount);
2622                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2623         }
2624         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2625 }
2626
2627 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2628 {
2629         struct ib_mad_port_private *port_priv = cq->cq_context;
2630         unsigned long flags;
2631
2632         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2633         if (!list_empty(&port_priv->port_list))
2634                 queue_work(port_priv->wq, &port_priv->work);
2635         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2636 }
2637
2638 /*
2639  * Allocate receive MADs and post receive WRs for them
2640  */
2641 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2642                                     struct ib_mad_private *mad)
2643 {
2644         unsigned long flags;
2645         int post, ret;
2646         struct ib_mad_private *mad_priv;
2647         struct ib_sge sg_list;
2648         struct ib_recv_wr recv_wr, *bad_recv_wr;
2649         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2650
2651         /* Initialize common scatter list fields */
2652         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2653         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2654
2655         /* Initialize common receive WR fields */
2656         recv_wr.next = NULL;
2657         recv_wr.sg_list = &sg_list;
2658         recv_wr.num_sge = 1;
2659
2660         do {
2661                 /* Allocate and map receive buffer */
2662                 if (mad) {
2663                         mad_priv = mad;
2664                         mad = NULL;
2665                 } else {
2666                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2667                         if (!mad_priv) {
2668                                 dev_err(&qp_info->port_priv->device->dev,
2669                                         "No memory for receive buffer\n");
2670                                 ret = -ENOMEM;
2671                                 break;
2672                         }
2673                 }
2674                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2675                                                  &mad_priv->grh,
2676                                                  sizeof *mad_priv -
2677                                                    sizeof mad_priv->header,
2678                                                  DMA_FROM_DEVICE);
2679                 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2680                                                   sg_list.addr))) {
2681                         ret = -ENOMEM;
2682                         break;
2683                 }
2684                 mad_priv->header.mapping = sg_list.addr;
2685                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2686                 mad_priv->header.mad_list.mad_queue = recv_queue;
2687
2688                 /* Post receive WR */
2689                 spin_lock_irqsave(&recv_queue->lock, flags);
2690                 post = (++recv_queue->count < recv_queue->max_active);
2691                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2692                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2693                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2694                 if (ret) {
2695                         spin_lock_irqsave(&recv_queue->lock, flags);
2696                         list_del(&mad_priv->header.mad_list.list);
2697                         recv_queue->count--;
2698                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2699                         ib_dma_unmap_single(qp_info->port_priv->device,
2700                                             mad_priv->header.mapping,
2701                                             sizeof *mad_priv -
2702                                               sizeof mad_priv->header,
2703                                             DMA_FROM_DEVICE);
2704                         kmem_cache_free(ib_mad_cache, mad_priv);
2705                         dev_err(&qp_info->port_priv->device->dev,
2706                                 "ib_post_recv failed: %d\n", ret);
2707                         break;
2708                 }
2709         } while (post);
2710
2711         return ret;
2712 }
2713
2714 /*
2715  * Return all the posted receive MADs
2716  */
2717 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2718 {
2719         struct ib_mad_private_header *mad_priv_hdr;
2720         struct ib_mad_private *recv;
2721         struct ib_mad_list_head *mad_list;
2722
2723         if (!qp_info->qp)
2724                 return;
2725
2726         while (!list_empty(&qp_info->recv_queue.list)) {
2727
2728                 mad_list = list_entry(qp_info->recv_queue.list.next,
2729                                       struct ib_mad_list_head, list);
2730                 mad_priv_hdr = container_of(mad_list,
2731                                             struct ib_mad_private_header,
2732                                             mad_list);
2733                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2734                                     header);
2735
2736                 /* Remove from posted receive MAD list */
2737                 list_del(&mad_list->list);
2738
2739                 ib_dma_unmap_single(qp_info->port_priv->device,
2740                                     recv->header.mapping,
2741                                     sizeof(struct ib_mad_private) -
2742                                       sizeof(struct ib_mad_private_header),
2743                                     DMA_FROM_DEVICE);
2744                 kmem_cache_free(ib_mad_cache, recv);
2745         }
2746
2747         qp_info->recv_queue.count = 0;
2748 }
2749
2750 /*
2751  * Start the port
2752  */
2753 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2754 {
2755         int ret, i;
2756         struct ib_qp_attr *attr;
2757         struct ib_qp *qp;
2758         u16 pkey_index;
2759
2760         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2761         if (!attr) {
2762                 dev_err(&port_priv->device->dev,
2763                         "Couldn't kmalloc ib_qp_attr\n");
2764                 return -ENOMEM;
2765         }
2766
2767         ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2768                            IB_DEFAULT_PKEY_FULL, &pkey_index);
2769         if (ret)
2770                 pkey_index = 0;
2771
2772         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2773                 qp = port_priv->qp_info[i].qp;
2774                 if (!qp)
2775                         continue;
2776
2777                 /*
2778                  * PKey index for QP1 is irrelevant but
2779                  * one is needed for the Reset to Init transition
2780                  */
2781                 attr->qp_state = IB_QPS_INIT;
2782                 attr->pkey_index = pkey_index;
2783                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2784                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2785                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2786                 if (ret) {
2787                         dev_err(&port_priv->device->dev,
2788                                 "Couldn't change QP%d state to INIT: %d\n",
2789                                 i, ret);
2790                         goto out;
2791                 }
2792
2793                 attr->qp_state = IB_QPS_RTR;
2794                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2795                 if (ret) {
2796                         dev_err(&port_priv->device->dev,
2797                                 "Couldn't change QP%d state to RTR: %d\n",
2798                                 i, ret);
2799                         goto out;
2800                 }
2801
2802                 attr->qp_state = IB_QPS_RTS;
2803                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2804                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2805                 if (ret) {
2806                         dev_err(&port_priv->device->dev,
2807                                 "Couldn't change QP%d state to RTS: %d\n",
2808                                 i, ret);
2809                         goto out;
2810                 }
2811         }
2812
2813         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2814         if (ret) {
2815                 dev_err(&port_priv->device->dev,
2816                         "Failed to request completion notification: %d\n",
2817                         ret);
2818                 goto out;
2819         }
2820
2821         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2822                 if (!port_priv->qp_info[i].qp)
2823                         continue;
2824
2825                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2826                 if (ret) {
2827                         dev_err(&port_priv->device->dev,
2828                                 "Couldn't post receive WRs\n");
2829                         goto out;
2830                 }
2831         }
2832 out:
2833         kfree(attr);
2834         return ret;
2835 }
2836
2837 static void qp_event_handler(struct ib_event *event, void *qp_context)
2838 {
2839         struct ib_mad_qp_info   *qp_info = qp_context;
2840
2841         /* It's worse than that! He's dead, Jim! */
2842         dev_err(&qp_info->port_priv->device->dev,
2843                 "Fatal error (%d) on MAD QP (%d)\n",
2844                 event->event, qp_info->qp->qp_num);
2845 }
2846
2847 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2848                            struct ib_mad_queue *mad_queue)
2849 {
2850         mad_queue->qp_info = qp_info;
2851         mad_queue->count = 0;
2852         spin_lock_init(&mad_queue->lock);
2853         INIT_LIST_HEAD(&mad_queue->list);
2854 }
2855
2856 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2857                         struct ib_mad_qp_info *qp_info)
2858 {
2859         qp_info->port_priv = port_priv;
2860         init_mad_queue(qp_info, &qp_info->send_queue);
2861         init_mad_queue(qp_info, &qp_info->recv_queue);
2862         INIT_LIST_HEAD(&qp_info->overflow_list);
2863         spin_lock_init(&qp_info->snoop_lock);
2864         qp_info->snoop_table = NULL;
2865         qp_info->snoop_table_size = 0;
2866         atomic_set(&qp_info->snoop_count, 0);
2867 }
2868
2869 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2870                          enum ib_qp_type qp_type)
2871 {
2872         struct ib_qp_init_attr  qp_init_attr;
2873         int ret;
2874
2875         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2876         qp_init_attr.send_cq = qp_info->port_priv->cq;
2877         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2878         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2879         qp_init_attr.cap.max_send_wr = mad_sendq_size;
2880         qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2881         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2882         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2883         qp_init_attr.qp_type = qp_type;
2884         qp_init_attr.port_num = qp_info->port_priv->port_num;
2885         qp_init_attr.qp_context = qp_info;
2886         qp_init_attr.event_handler = qp_event_handler;
2887         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2888         if (IS_ERR(qp_info->qp)) {
2889                 dev_err(&qp_info->port_priv->device->dev,
2890                         "Couldn't create ib_mad QP%d\n",
2891                         get_spl_qp_index(qp_type));
2892                 ret = PTR_ERR(qp_info->qp);
2893                 goto error;
2894         }
2895         /* Use minimum queue sizes unless the CQ is resized */
2896         qp_info->send_queue.max_active = mad_sendq_size;
2897         qp_info->recv_queue.max_active = mad_recvq_size;
2898         return 0;
2899
2900 error:
2901         return ret;
2902 }
2903
2904 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2905 {
2906         if (!qp_info->qp)
2907                 return;
2908
2909         ib_destroy_qp(qp_info->qp);
2910         kfree(qp_info->snoop_table);
2911 }
2912
2913 /*
2914  * Open the port
2915  * Create the QP, PD, MR, and CQ if needed
2916  */
2917 static int ib_mad_port_open(struct ib_device *device,
2918                             int port_num)
2919 {
2920         int ret, cq_size;
2921         struct ib_mad_port_private *port_priv;
2922         unsigned long flags;
2923         char name[sizeof "ib_mad123"];
2924         int has_smi;
2925
2926         /* Create new device info */
2927         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2928         if (!port_priv) {
2929                 dev_err(&device->dev, "No memory for ib_mad_port_private\n");
2930                 return -ENOMEM;
2931         }
2932
2933         port_priv->device = device;
2934         port_priv->port_num = port_num;
2935         spin_lock_init(&port_priv->reg_lock);
2936         INIT_LIST_HEAD(&port_priv->agent_list);
2937         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2938         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2939
2940         cq_size = mad_sendq_size + mad_recvq_size;
2941         has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2942         if (has_smi)
2943                 cq_size *= 2;
2944
2945         port_priv->cq = ib_create_cq(port_priv->device,
2946                                      ib_mad_thread_completion_handler,
2947                                      NULL, port_priv, cq_size, 0);
2948         if (IS_ERR(port_priv->cq)) {
2949                 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2950                 ret = PTR_ERR(port_priv->cq);
2951                 goto error3;
2952         }
2953
2954         port_priv->pd = ib_alloc_pd(device);
2955         if (IS_ERR(port_priv->pd)) {
2956                 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2957                 ret = PTR_ERR(port_priv->pd);
2958                 goto error4;
2959         }
2960
2961         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2962         if (IS_ERR(port_priv->mr)) {
2963                 dev_err(&device->dev, "Couldn't get ib_mad DMA MR\n");
2964                 ret = PTR_ERR(port_priv->mr);
2965                 goto error5;
2966         }
2967
2968         if (has_smi) {
2969                 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2970                 if (ret)
2971                         goto error6;
2972         }
2973         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2974         if (ret)
2975                 goto error7;
2976
2977         snprintf(name, sizeof name, "ib_mad%d", port_num);
2978         port_priv->wq = create_singlethread_workqueue(name);
2979         if (!port_priv->wq) {
2980                 ret = -ENOMEM;
2981                 goto error8;
2982         }
2983         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2984
2985         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2986         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2987         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2988
2989         ret = ib_mad_port_start(port_priv);
2990         if (ret) {
2991                 dev_err(&device->dev, "Couldn't start port\n");
2992                 goto error9;
2993         }
2994
2995         return 0;
2996
2997 error9:
2998         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2999         list_del_init(&port_priv->port_list);
3000         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3001
3002         destroy_workqueue(port_priv->wq);
3003 error8:
3004         destroy_mad_qp(&port_priv->qp_info[1]);
3005 error7:
3006         destroy_mad_qp(&port_priv->qp_info[0]);
3007 error6:
3008         ib_dereg_mr(port_priv->mr);
3009 error5:
3010         ib_dealloc_pd(port_priv->pd);
3011 error4:
3012         ib_destroy_cq(port_priv->cq);
3013         cleanup_recv_queue(&port_priv->qp_info[1]);
3014         cleanup_recv_queue(&port_priv->qp_info[0]);
3015 error3:
3016         kfree(port_priv);
3017
3018         return ret;
3019 }
3020
3021 /*
3022  * Close the port
3023  * If there are no classes using the port, free the port
3024  * resources (CQ, MR, PD, QP) and remove the port's info structure
3025  */
3026 static int ib_mad_port_close(struct ib_device *device, int port_num)
3027 {
3028         struct ib_mad_port_private *port_priv;
3029         unsigned long flags;
3030
3031         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3032         port_priv = __ib_get_mad_port(device, port_num);
3033         if (port_priv == NULL) {
3034                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3035                 dev_err(&device->dev, "Port %d not found\n", port_num);
3036                 return -ENODEV;
3037         }
3038         list_del_init(&port_priv->port_list);
3039         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3040
3041         destroy_workqueue(port_priv->wq);
3042         destroy_mad_qp(&port_priv->qp_info[1]);
3043         destroy_mad_qp(&port_priv->qp_info[0]);
3044         ib_dereg_mr(port_priv->mr);
3045         ib_dealloc_pd(port_priv->pd);
3046         ib_destroy_cq(port_priv->cq);
3047         cleanup_recv_queue(&port_priv->qp_info[1]);
3048         cleanup_recv_queue(&port_priv->qp_info[0]);
3049         /* XXX: Handle deallocation of MAD registration tables */
3050
3051         kfree(port_priv);
3052
3053         return 0;
3054 }
3055
3056 static void ib_mad_init_device(struct ib_device *device)
3057 {
3058         int start, end, i;
3059
3060         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3061                 return;
3062
3063         if (device->node_type == RDMA_NODE_IB_SWITCH) {
3064                 start = 0;
3065                 end   = 0;
3066         } else {
3067                 start = 1;
3068                 end   = device->phys_port_cnt;
3069         }
3070
3071         for (i = start; i <= end; i++) {
3072                 if (ib_mad_port_open(device, i)) {
3073                         dev_err(&device->dev, "Couldn't open port %d\n", i);
3074                         goto error;
3075                 }
3076                 if (ib_agent_port_open(device, i)) {
3077                         dev_err(&device->dev,
3078                                 "Couldn't open port %d for agents\n", i);
3079                         goto error_agent;
3080                 }
3081         }
3082         return;
3083
3084 error_agent:
3085         if (ib_mad_port_close(device, i))
3086                 dev_err(&device->dev, "Couldn't close port %d\n", i);
3087
3088 error:
3089         i--;
3090
3091         while (i >= start) {
3092                 if (ib_agent_port_close(device, i))
3093                         dev_err(&device->dev,
3094                                 "Couldn't close port %d for agents\n", i);
3095                 if (ib_mad_port_close(device, i))
3096                         dev_err(&device->dev, "Couldn't close port %d\n", i);
3097                 i--;
3098         }
3099 }
3100
3101 static void ib_mad_remove_device(struct ib_device *device)
3102 {
3103         int i, num_ports, cur_port;
3104
3105         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3106                 return;
3107
3108         if (device->node_type == RDMA_NODE_IB_SWITCH) {
3109                 num_ports = 1;
3110                 cur_port = 0;
3111         } else {
3112                 num_ports = device->phys_port_cnt;
3113                 cur_port = 1;
3114         }
3115         for (i = 0; i < num_ports; i++, cur_port++) {
3116                 if (ib_agent_port_close(device, cur_port))
3117                         dev_err(&device->dev,
3118                                 "Couldn't close port %d for agents\n",
3119                                 cur_port);
3120                 if (ib_mad_port_close(device, cur_port))
3121                         dev_err(&device->dev, "Couldn't close port %d\n",
3122                                 cur_port);
3123         }
3124 }
3125
3126 static struct ib_client mad_client = {
3127         .name   = "mad",
3128         .add = ib_mad_init_device,
3129         .remove = ib_mad_remove_device
3130 };
3131
3132 static int __init ib_mad_init_module(void)
3133 {
3134         int ret;
3135
3136         mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3137         mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3138
3139         mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3140         mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3141
3142         ib_mad_cache = kmem_cache_create("ib_mad",
3143                                          sizeof(struct ib_mad_private),
3144                                          0,
3145                                          SLAB_HWCACHE_ALIGN,
3146                                          NULL);
3147         if (!ib_mad_cache) {
3148                 pr_err("Couldn't create ib_mad cache\n");
3149                 ret = -ENOMEM;
3150                 goto error1;
3151         }
3152
3153         INIT_LIST_HEAD(&ib_mad_port_list);
3154
3155         if (ib_register_client(&mad_client)) {
3156                 pr_err("Couldn't register ib_mad client\n");
3157                 ret = -EINVAL;
3158                 goto error2;
3159         }
3160
3161         return 0;
3162
3163 error2:
3164         kmem_cache_destroy(ib_mad_cache);
3165 error1:
3166         return ret;
3167 }
3168
3169 static void __exit ib_mad_cleanup_module(void)
3170 {
3171         ib_unregister_client(&mad_client);
3172         kmem_cache_destroy(ib_mad_cache);
3173 }
3174
3175 module_init(ib_mad_init_module);
3176 module_exit(ib_mad_cleanup_module);