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  * Copyright (c) 2014 Intel Corporation.  All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  *
  36  */
  37
  38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  39
  40 #include <linux/dma-mapping.h>
  41 #include <linux/slab.h>
  42 #include <linux/module.h>
  43 #include <linux/security.h>
  44 #include <rdma/ib_cache.h>
  45
  46 #include "mad_priv.h"
  47 #include "core_priv.h"
  48 #include "mad_rmpp.h"
  49 #include "smi.h"
  50 #include "opa_smi.h"
  51 #include "agent.h"
  52
  53 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
  54 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
  55
  56 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
  57 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
  58 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
  59 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
  60
  61 static struct list_head ib_mad_port_list;
  62 static atomic_t ib_mad_client_id = ATOMIC_INIT(0);
  63
  64 /* Port list lock */
  65 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
  66
  67 /* Forward declarations */
  68 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  69                          struct ib_mad_reg_req *mad_reg_req);
  70 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  71 static struct ib_mad_agent_private *find_mad_agent(
  72                                         struct ib_mad_port_private *port_priv,
  73                                         const struct ib_mad_hdr *mad);
  74 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  75                                     struct ib_mad_private *mad);
  76 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  77 static void timeout_sends(struct work_struct *work);
  78 static void local_completions(struct work_struct *work);
  79 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  80                               struct ib_mad_agent_private *agent_priv,
  81                               u8 mgmt_class);
  82 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  83                            struct ib_mad_agent_private *agent_priv);
  84 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
  85                               struct ib_wc *wc);
  86 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
  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(const struct ib_mad_hdr *hdr)
 183 {
 184         return ((hdr->method & IB_MGMT_METHOD_RESP) ||
 185                 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 186                 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
 187                  (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,
 321                            "ib_register_mad_agent: Invalid port %d\n",
 322                            port_num);
 323                 ret = ERR_PTR(-ENODEV);
 324                 goto error1;
 325         }
 326
 327         /* Verify the QP requested is supported.  For example, Ethernet devices
 328          * will not have QP0 */
 329         if (!port_priv->qp_info[qpn].qp) {
 330                 dev_notice(&device->dev,
 331                            "ib_register_mad_agent: QP %d not supported\n", qpn);
 332                 ret = ERR_PTR(-EPROTONOSUPPORT);
 333                 goto error1;
 334         }
 335
 336         /* Allocate structures */
 337         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 338         if (!mad_agent_priv) {
 339                 ret = ERR_PTR(-ENOMEM);
 340                 goto error1;
 341         }
 342
 343         if (mad_reg_req) {
 344                 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
 345                 if (!reg_req) {
 346                         ret = ERR_PTR(-ENOMEM);
 347                         goto error3;
 348                 }
 349         }
 350
 351         /* Now, fill in the various structures */
 352         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 353         mad_agent_priv->reg_req = reg_req;
 354         mad_agent_priv->agent.rmpp_version = rmpp_version;
 355         mad_agent_priv->agent.device = device;
 356         mad_agent_priv->agent.recv_handler = recv_handler;
 357         mad_agent_priv->agent.send_handler = send_handler;
 358         mad_agent_priv->agent.context = context;
 359         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 360         mad_agent_priv->agent.port_num = port_num;
 361         mad_agent_priv->agent.flags = registration_flags;
 362         spin_lock_init(&mad_agent_priv->lock);
 363         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 364         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 365         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 366         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 367         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 368         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 369         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 370         atomic_set(&mad_agent_priv->refcount, 1);
 371         init_completion(&mad_agent_priv->comp);
 372
 373         ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
 374         if (ret2) {
 375                 ret = ERR_PTR(ret2);
 376                 goto error4;
 377         }
 378
 379         spin_lock_irqsave(&port_priv->reg_lock, flags);
 380         mad_agent_priv->agent.hi_tid = atomic_inc_return(&ib_mad_client_id);
 381
 382         /*
 383          * Make sure MAD registration (if supplied)
 384          * is non overlapping with any existing ones
 385          */
 386         if (mad_reg_req) {
 387                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 388                 if (!is_vendor_class(mgmt_class)) {
 389                         class = port_priv->version[mad_reg_req->
 390                                                    mgmt_class_version].class;
 391                         if (class) {
 392                                 method = class->method_table[mgmt_class];
 393                                 if (method) {
 394                                         if (method_in_use(&method,
 395                                                            mad_reg_req))
 396                                                 goto error5;
 397                                 }
 398                         }
 399                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 400                                                   mgmt_class);
 401                 } else {
 402                         /* "New" vendor class range */
 403                         vendor = port_priv->version[mad_reg_req->
 404                                                     mgmt_class_version].vendor;
 405                         if (vendor) {
 406                                 vclass = vendor_class_index(mgmt_class);
 407                                 vendor_class = vendor->vendor_class[vclass];
 408                                 if (vendor_class) {
 409                                         if (is_vendor_method_in_use(
 410                                                         vendor_class,
 411                                                         mad_reg_req))
 412                                                 goto error5;
 413                                 }
 414                         }
 415                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 416                 }
 417                 if (ret2) {
 418                         ret = ERR_PTR(ret2);
 419                         goto error5;
 420                 }
 421         }
 422
 423         /* Add mad agent into port's agent list */
 424         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 425         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 426
 427         return &mad_agent_priv->agent;
 428 error5:
 429         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 430         ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
 431 error4:
 432         kfree(reg_req);
 433 error3:
 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         int err;
 503
 504         /* Validate parameters */
 505         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 506             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 507                 ret = ERR_PTR(-EINVAL);
 508                 goto error1;
 509         }
 510         qpn = get_spl_qp_index(qp_type);
 511         if (qpn == -1) {
 512                 ret = ERR_PTR(-EINVAL);
 513                 goto error1;
 514         }
 515         port_priv = ib_get_mad_port(device, port_num);
 516         if (!port_priv) {
 517                 ret = ERR_PTR(-ENODEV);
 518                 goto error1;
 519         }
 520         /* Allocate structures */
 521         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 522         if (!mad_snoop_priv) {
 523                 ret = ERR_PTR(-ENOMEM);
 524                 goto error1;
 525         }
 526
 527         /* Now, fill in the various structures */
 528         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 529         mad_snoop_priv->agent.device = device;
 530         mad_snoop_priv->agent.recv_handler = recv_handler;
 531         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 532         mad_snoop_priv->agent.context = context;
 533         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 534         mad_snoop_priv->agent.port_num = port_num;
 535         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 536         init_completion(&mad_snoop_priv->comp);
 537
 538         err = ib_mad_agent_security_setup(&mad_snoop_priv->agent, qp_type);
 539         if (err) {
 540                 ret = ERR_PTR(err);
 541                 goto error2;
 542         }
 543
 544         mad_snoop_priv->snoop_index = register_snoop_agent(
 545                                                 &port_priv->qp_info[qpn],
 546                                                 mad_snoop_priv);
 547         if (mad_snoop_priv->snoop_index < 0) {
 548                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 549                 goto error3;
 550         }
 551
 552         atomic_set(&mad_snoop_priv->refcount, 1);
 553         return &mad_snoop_priv->agent;
 554 error3:
 555         ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
 556 error2:
 557         kfree(mad_snoop_priv);
 558 error1:
 559         return ret;
 560 }
 561 EXPORT_SYMBOL(ib_register_mad_snoop);
 562
 563 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 564 {
 565         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 566                 complete(&mad_agent_priv->comp);
 567 }
 568
 569 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 570 {
 571         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 572                 complete(&mad_snoop_priv->comp);
 573 }
 574
 575 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 576 {
 577         struct ib_mad_port_private *port_priv;
 578         unsigned long flags;
 579
 580         /* Note that we could still be handling received MADs */
 581
 582         /*
 583          * Canceling all sends results in dropping received response
 584          * MADs, preventing us from queuing additional work
 585          */
 586         cancel_mads(mad_agent_priv);
 587         port_priv = mad_agent_priv->qp_info->port_priv;
 588         cancel_delayed_work(&mad_agent_priv->timed_work);
 589
 590         spin_lock_irqsave(&port_priv->reg_lock, flags);
 591         remove_mad_reg_req(mad_agent_priv);
 592         list_del(&mad_agent_priv->agent_list);
 593         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 594
 595         flush_workqueue(port_priv->wq);
 596         ib_cancel_rmpp_recvs(mad_agent_priv);
 597
 598         deref_mad_agent(mad_agent_priv);
 599         wait_for_completion(&mad_agent_priv->comp);
 600
 601         ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
 602
 603         kfree(mad_agent_priv->reg_req);
 604         kfree(mad_agent_priv);
 605 }
 606
 607 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 608 {
 609         struct ib_mad_qp_info *qp_info;
 610         unsigned long flags;
 611
 612         qp_info = mad_snoop_priv->qp_info;
 613         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 614         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 615         atomic_dec(&qp_info->snoop_count);
 616         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 617
 618         deref_snoop_agent(mad_snoop_priv);
 619         wait_for_completion(&mad_snoop_priv->comp);
 620
 621         ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
 622
 623         kfree(mad_snoop_priv);
 624 }
 625
 626 /*
 627  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 628  */
 629 void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 630 {
 631         struct ib_mad_agent_private *mad_agent_priv;
 632         struct ib_mad_snoop_private *mad_snoop_priv;
 633
 634         /* If the TID is zero, the agent can only snoop. */
 635         if (mad_agent->hi_tid) {
 636                 mad_agent_priv = container_of(mad_agent,
 637                                               struct ib_mad_agent_private,
 638                                               agent);
 639                 unregister_mad_agent(mad_agent_priv);
 640         } else {
 641                 mad_snoop_priv = container_of(mad_agent,
 642                                               struct ib_mad_snoop_private,
 643                                               agent);
 644                 unregister_mad_snoop(mad_snoop_priv);
 645         }
 646 }
 647 EXPORT_SYMBOL(ib_unregister_mad_agent);
 648
 649 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 650 {
 651         struct ib_mad_queue *mad_queue;
 652         unsigned long flags;
 653
 654         BUG_ON(!mad_list->mad_queue);
 655         mad_queue = mad_list->mad_queue;
 656         spin_lock_irqsave(&mad_queue->lock, flags);
 657         list_del(&mad_list->list);
 658         mad_queue->count--;
 659         spin_unlock_irqrestore(&mad_queue->lock, flags);
 660 }
 661
 662 static void snoop_send(struct ib_mad_qp_info *qp_info,
 663                        struct ib_mad_send_buf *send_buf,
 664                        struct ib_mad_send_wc *mad_send_wc,
 665                        int mad_snoop_flags)
 666 {
 667         struct ib_mad_snoop_private *mad_snoop_priv;
 668         unsigned long flags;
 669         int i;
 670
 671         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 672         for (i = 0; i < qp_info->snoop_table_size; i++) {
 673                 mad_snoop_priv = qp_info->snoop_table[i];
 674                 if (!mad_snoop_priv ||
 675                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 676                         continue;
 677
 678                 atomic_inc(&mad_snoop_priv->refcount);
 679                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 680                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 681                                                     send_buf, mad_send_wc);
 682                 deref_snoop_agent(mad_snoop_priv);
 683                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 684         }
 685         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 686 }
 687
 688 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 689                        struct ib_mad_recv_wc *mad_recv_wc,
 690                        int mad_snoop_flags)
 691 {
 692         struct ib_mad_snoop_private *mad_snoop_priv;
 693         unsigned long flags;
 694         int i;
 695
 696         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 697         for (i = 0; i < qp_info->snoop_table_size; i++) {
 698                 mad_snoop_priv = qp_info->snoop_table[i];
 699                 if (!mad_snoop_priv ||
 700                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 701                         continue;
 702
 703                 atomic_inc(&mad_snoop_priv->refcount);
 704                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 705                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
 706                                                    mad_recv_wc);
 707                 deref_snoop_agent(mad_snoop_priv);
 708                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 709         }
 710         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 711 }
 712
 713 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
 714                 u16 pkey_index, u8 port_num, struct ib_wc *wc)
 715 {
 716         memset(wc, 0, sizeof *wc);
 717         wc->wr_cqe = cqe;
 718         wc->status = IB_WC_SUCCESS;
 719         wc->opcode = IB_WC_RECV;
 720         wc->pkey_index = pkey_index;
 721         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 722         wc->src_qp = IB_QP0;
 723         wc->qp = qp;
 724         wc->slid = slid;
 725         wc->sl = 0;
 726         wc->dlid_path_bits = 0;
 727         wc->port_num = port_num;
 728 }
 729
 730 static size_t mad_priv_size(const struct ib_mad_private *mp)
 731 {
 732         return sizeof(struct ib_mad_private) + mp->mad_size;
 733 }
 734
 735 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
 736 {
 737         size_t size = sizeof(struct ib_mad_private) + mad_size;
 738         struct ib_mad_private *ret = kzalloc(size, flags);
 739
 740         if (ret)
 741                 ret->mad_size = mad_size;
 742
 743         return ret;
 744 }
 745
 746 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
 747 {
 748         return rdma_max_mad_size(port_priv->device, port_priv->port_num);
 749 }
 750
 751 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
 752 {
 753         return sizeof(struct ib_grh) + mp->mad_size;
 754 }
 755
 756 /*
 757  * Return 0 if SMP is to be sent
 758  * Return 1 if SMP was consumed locally (whether or not solicited)
 759  * Return < 0 if error
 760  */
 761 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 762                                   struct ib_mad_send_wr_private *mad_send_wr)
 763 {
 764         int ret = 0;
 765         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 766         struct opa_smp *opa_smp = (struct opa_smp *)smp;
 767         unsigned long flags;
 768         struct ib_mad_local_private *local;
 769         struct ib_mad_private *mad_priv;
 770         struct ib_mad_port_private *port_priv;
 771         struct ib_mad_agent_private *recv_mad_agent = NULL;
 772         struct ib_device *device = mad_agent_priv->agent.device;
 773         u8 port_num;
 774         struct ib_wc mad_wc;
 775         struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
 776         size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
 777         u16 out_mad_pkey_index = 0;
 778         u16 drslid;
 779         bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
 780                                     mad_agent_priv->qp_info->port_priv->port_num);
 781
 782         if (rdma_cap_ib_switch(device) &&
 783             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 784                 port_num = send_wr->port_num;
 785         else
 786                 port_num = mad_agent_priv->agent.port_num;
 787
 788         /*
 789          * Directed route handling starts if the initial LID routed part of
 790          * a request or the ending LID routed part of a response is empty.
 791          * If we are at the start of the LID routed part, don't update the
 792          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 793          */
 794         if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
 795                 u32 opa_drslid;
 796
 797                 if ((opa_get_smp_direction(opa_smp)
 798                      ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
 799                      OPA_LID_PERMISSIVE &&
 800                      opa_smi_handle_dr_smp_send(opa_smp,
 801                                                 rdma_cap_ib_switch(device),
 802                                                 port_num) == IB_SMI_DISCARD) {
 803                         ret = -EINVAL;
 804                         dev_err(&device->dev, "OPA Invalid directed route\n");
 805                         goto out;
 806                 }
 807                 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
 808                 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
 809                     opa_drslid & 0xffff0000) {
 810                         ret = -EINVAL;
 811                         dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
 812                                opa_drslid);
 813                         goto out;
 814                 }
 815                 drslid = (u16)(opa_drslid & 0x0000ffff);
 816
 817                 /* Check to post send on QP or process locally */
 818                 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
 819                     opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
 820                         goto out;
 821         } else {
 822                 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 823                      IB_LID_PERMISSIVE &&
 824                      smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
 825                      IB_SMI_DISCARD) {
 826                         ret = -EINVAL;
 827                         dev_err(&device->dev, "Invalid directed route\n");
 828                         goto out;
 829                 }
 830                 drslid = be16_to_cpu(smp->dr_slid);
 831
 832                 /* Check to post send on QP or process locally */
 833                 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 834                     smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 835                         goto out;
 836         }
 837
 838         local = kmalloc(sizeof *local, GFP_ATOMIC);
 839         if (!local) {
 840                 ret = -ENOMEM;
 841                 goto out;
 842         }
 843         local->mad_priv = NULL;
 844         local->recv_mad_agent = NULL;
 845         mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
 846         if (!mad_priv) {
 847                 ret = -ENOMEM;
 848                 kfree(local);
 849                 goto out;
 850         }
 851
 852         build_smp_wc(mad_agent_priv->agent.qp,
 853                      send_wr->wr.wr_cqe, drslid,
 854                      send_wr->pkey_index,
 855                      send_wr->port_num, &mad_wc);
 856
 857         if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
 858                 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
 859                                         + mad_send_wr->send_buf.data_len
 860                                         + sizeof(struct ib_grh);
 861         }
 862
 863         /* No GRH for DR SMP */
 864         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 865                                   (const struct ib_mad_hdr *)smp, mad_size,
 866                                   (struct ib_mad_hdr *)mad_priv->mad,
 867                                   &mad_size, &out_mad_pkey_index);
 868         switch (ret)
 869         {
 870         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 871                 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
 872                     mad_agent_priv->agent.recv_handler) {
 873                         local->mad_priv = mad_priv;
 874                         local->recv_mad_agent = mad_agent_priv;
 875                         /*
 876                          * Reference MAD agent until receive
 877                          * side of local completion handled
 878                          */
 879                         atomic_inc(&mad_agent_priv->refcount);
 880                 } else
 881                         kfree(mad_priv);
 882                 break;
 883         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 884                 kfree(mad_priv);
 885                 break;
 886         case IB_MAD_RESULT_SUCCESS:
 887                 /* Treat like an incoming receive MAD */
 888                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 889                                             mad_agent_priv->agent.port_num);
 890                 if (port_priv) {
 891                         memcpy(mad_priv->mad, smp, mad_priv->mad_size);
 892                         recv_mad_agent = find_mad_agent(port_priv,
 893                                                         (const struct ib_mad_hdr *)mad_priv->mad);
 894                 }
 895                 if (!port_priv || !recv_mad_agent) {
 896                         /*
 897                          * No receiving agent so drop packet and
 898                          * generate send completion.
 899                          */
 900                         kfree(mad_priv);
 901                         break;
 902                 }
 903                 local->mad_priv = mad_priv;
 904                 local->recv_mad_agent = recv_mad_agent;
 905                 break;
 906         default:
 907                 kfree(mad_priv);
 908                 kfree(local);
 909                 ret = -EINVAL;
 910                 goto out;
 911         }
 912
 913         local->mad_send_wr = mad_send_wr;
 914         if (opa) {
 915                 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
 916                 local->return_wc_byte_len = mad_size;
 917         }
 918         /* Reference MAD agent until send side of local completion handled */
 919         atomic_inc(&mad_agent_priv->refcount);
 920         /* Queue local completion to local list */
 921         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 922         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 923         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 924         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 925                    &mad_agent_priv->local_work);
 926         ret = 1;
 927 out:
 928         return ret;
 929 }
 930
 931 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
 932 {
 933         int seg_size, pad;
 934
 935         seg_size = mad_size - hdr_len;
 936         if (data_len && seg_size) {
 937                 pad = seg_size - data_len % seg_size;
 938                 return pad == seg_size ? 0 : pad;
 939         } else
 940                 return seg_size;
 941 }
 942
 943 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 944 {
 945         struct ib_rmpp_segment *s, *t;
 946
 947         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 948                 list_del(&s->list);
 949                 kfree(s);
 950         }
 951 }
 952
 953 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 954                                 size_t mad_size, gfp_t gfp_mask)
 955 {
 956         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 957         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 958         struct ib_rmpp_segment *seg = NULL;
 959         int left, seg_size, pad;
 960
 961         send_buf->seg_size = mad_size - send_buf->hdr_len;
 962         send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
 963         seg_size = send_buf->seg_size;
 964         pad = send_wr->pad;
 965
 966         /* Allocate data segments. */
 967         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 968                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 969                 if (!seg) {
 970                         free_send_rmpp_list(send_wr);
 971                         return -ENOMEM;
 972                 }
 973                 seg->num = ++send_buf->seg_count;
 974                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 975         }
 976
 977         /* Zero any padding */
 978         if (pad)
 979                 memset(seg->data + seg_size - pad, 0, pad);
 980
 981         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 982                                           agent.rmpp_version;
 983         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 984         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 985
 986         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 987                                         struct ib_rmpp_segment, list);
 988         send_wr->last_ack_seg = send_wr->cur_seg;
 989         return 0;
 990 }
 991
 992 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
 993 {
 994         return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
 995 }
 996 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
 997
 998 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 999                                             u32 remote_qpn, u16 pkey_index,
1000                                             int rmpp_active,
1001                                             int hdr_len, int data_len,
1002                                             gfp_t gfp_mask,
1003                                             u8 base_version)
1004 {
1005         struct ib_mad_agent_private *mad_agent_priv;
1006         struct ib_mad_send_wr_private *mad_send_wr;
1007         int pad, message_size, ret, size;
1008         void *buf;
1009         size_t mad_size;
1010         bool opa;
1011
1012         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
1013                                       agent);
1014
1015         opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
1016
1017         if (opa && base_version == OPA_MGMT_BASE_VERSION)
1018                 mad_size = sizeof(struct opa_mad);
1019         else
1020                 mad_size = sizeof(struct ib_mad);
1021
1022         pad = get_pad_size(hdr_len, data_len, mad_size);
1023         message_size = hdr_len + data_len + pad;
1024
1025         if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1026                 if (!rmpp_active && message_size > mad_size)
1027                         return ERR_PTR(-EINVAL);
1028         } else
1029                 if (rmpp_active || message_size > mad_size)
1030                         return ERR_PTR(-EINVAL);
1031
1032         size = rmpp_active ? hdr_len : mad_size;
1033         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1034         if (!buf)
1035                 return ERR_PTR(-ENOMEM);
1036
1037         mad_send_wr = buf + size;
1038         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1039         mad_send_wr->send_buf.mad = buf;
1040         mad_send_wr->send_buf.hdr_len = hdr_len;
1041         mad_send_wr->send_buf.data_len = data_len;
1042         mad_send_wr->pad = pad;
1043
1044         mad_send_wr->mad_agent_priv = mad_agent_priv;
1045         mad_send_wr->sg_list[0].length = hdr_len;
1046         mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1047
1048         /* OPA MADs don't have to be the full 2048 bytes */
1049         if (opa && base_version == OPA_MGMT_BASE_VERSION &&
1050             data_len < mad_size - hdr_len)
1051                 mad_send_wr->sg_list[1].length = data_len;
1052         else
1053                 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
1054
1055         mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1056
1057         mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1058
1059         mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1060         mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
1061         mad_send_wr->send_wr.wr.num_sge = 2;
1062         mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
1063         mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
1064         mad_send_wr->send_wr.remote_qpn = remote_qpn;
1065         mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
1066         mad_send_wr->send_wr.pkey_index = pkey_index;
1067
1068         if (rmpp_active) {
1069                 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1070                 if (ret) {
1071                         kfree(buf);
1072                         return ERR_PTR(ret);
1073                 }
1074         }
1075
1076         mad_send_wr->send_buf.mad_agent = mad_agent;
1077         atomic_inc(&mad_agent_priv->refcount);
1078         return &mad_send_wr->send_buf;
1079 }
1080 EXPORT_SYMBOL(ib_create_send_mad);
1081
1082 int ib_get_mad_data_offset(u8 mgmt_class)
1083 {
1084         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
1085                 return IB_MGMT_SA_HDR;
1086         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1087                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1088                  (mgmt_class == IB_MGMT_CLASS_BIS))
1089                 return IB_MGMT_DEVICE_HDR;
1090         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1091                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
1092                 return IB_MGMT_VENDOR_HDR;
1093         else
1094                 return IB_MGMT_MAD_HDR;
1095 }
1096 EXPORT_SYMBOL(ib_get_mad_data_offset);
1097
1098 int ib_is_mad_class_rmpp(u8 mgmt_class)
1099 {
1100         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
1101             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
1102             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
1103             (mgmt_class == IB_MGMT_CLASS_BIS) ||
1104             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
1105              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
1106                 return 1;
1107         return 0;
1108 }
1109 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
1110
1111 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
1112 {
1113         struct ib_mad_send_wr_private *mad_send_wr;
1114         struct list_head *list;
1115
1116         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1117                                    send_buf);
1118         list = &mad_send_wr->cur_seg->list;
1119
1120         if (mad_send_wr->cur_seg->num < seg_num) {
1121                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
1122                         if (mad_send_wr->cur_seg->num == seg_num)
1123                                 break;
1124         } else if (mad_send_wr->cur_seg->num > seg_num) {
1125                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
1126                         if (mad_send_wr->cur_seg->num == seg_num)
1127                                 break;
1128         }
1129         return mad_send_wr->cur_seg->data;
1130 }
1131 EXPORT_SYMBOL(ib_get_rmpp_segment);
1132
1133 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
1134 {
1135         if (mad_send_wr->send_buf.seg_count)
1136                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
1137                                            mad_send_wr->seg_num);
1138         else
1139                 return mad_send_wr->send_buf.mad +
1140                        mad_send_wr->send_buf.hdr_len;
1141 }
1142
1143 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
1144 {
1145         struct ib_mad_agent_private *mad_agent_priv;
1146         struct ib_mad_send_wr_private *mad_send_wr;
1147
1148         mad_agent_priv = container_of(send_buf->mad_agent,
1149                                       struct ib_mad_agent_private, agent);
1150         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
1151                                    send_buf);
1152
1153         free_send_rmpp_list(mad_send_wr);
1154         kfree(send_buf->mad);
1155         deref_mad_agent(mad_agent_priv);
1156 }
1157 EXPORT_SYMBOL(ib_free_send_mad);
1158
1159 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1160 {
1161         struct ib_mad_qp_info *qp_info;
1162         struct list_head *list;
1163         struct ib_send_wr *bad_send_wr;
1164         struct ib_mad_agent *mad_agent;
1165         struct ib_sge *sge;
1166         unsigned long flags;
1167         int ret;
1168
1169         /* Set WR ID to find mad_send_wr upon completion */
1170         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1171         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1172         mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1173         mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1174
1175         mad_agent = mad_send_wr->send_buf.mad_agent;
1176         sge = mad_send_wr->sg_list;
1177         sge[0].addr = ib_dma_map_single(mad_agent->device,
1178                                         mad_send_wr->send_buf.mad,
1179                                         sge[0].length,
1180                                         DMA_TO_DEVICE);
1181         if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1182                 return -ENOMEM;
1183
1184         mad_send_wr->header_mapping = sge[0].addr;
1185
1186         sge[1].addr = ib_dma_map_single(mad_agent->device,
1187                                         ib_get_payload(mad_send_wr),
1188                                         sge[1].length,
1189                                         DMA_TO_DEVICE);
1190         if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1191                 ib_dma_unmap_single(mad_agent->device,
1192                                     mad_send_wr->header_mapping,
1193                                     sge[0].length, DMA_TO_DEVICE);
1194                 return -ENOMEM;
1195         }
1196         mad_send_wr->payload_mapping = sge[1].addr;
1197
1198         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1199         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1200                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1201                                    &bad_send_wr);
1202                 list = &qp_info->send_queue.list;
1203         } else {
1204                 ret = 0;
1205                 list = &qp_info->overflow_list;
1206         }
1207
1208         if (!ret) {
1209                 qp_info->send_queue.count++;
1210                 list_add_tail(&mad_send_wr->mad_list.list, list);
1211         }
1212         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1213         if (ret) {
1214                 ib_dma_unmap_single(mad_agent->device,
1215                                     mad_send_wr->header_mapping,
1216                                     sge[0].length, DMA_TO_DEVICE);
1217                 ib_dma_unmap_single(mad_agent->device,
1218                                     mad_send_wr->payload_mapping,
1219                                     sge[1].length, DMA_TO_DEVICE);
1220         }
1221         return ret;
1222 }
1223
1224 /*
1225  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1226  *  with the registered client
1227  */
1228 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1229                      struct ib_mad_send_buf **bad_send_buf)
1230 {
1231         struct ib_mad_agent_private *mad_agent_priv;
1232         struct ib_mad_send_buf *next_send_buf;
1233         struct ib_mad_send_wr_private *mad_send_wr;
1234         unsigned long flags;
1235         int ret = -EINVAL;
1236
1237         /* Walk list of send WRs and post each on send list */
1238         for (; send_buf; send_buf = next_send_buf) {
1239                 mad_send_wr = container_of(send_buf,
1240                                            struct ib_mad_send_wr_private,
1241                                            send_buf);
1242                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1243
1244                 ret = ib_mad_enforce_security(mad_agent_priv,
1245                                               mad_send_wr->send_wr.pkey_index);
1246                 if (ret)
1247                         goto error;
1248
1249                 if (!send_buf->mad_agent->send_handler ||
1250                     (send_buf->timeout_ms &&
1251                      !send_buf->mad_agent->recv_handler)) {
1252                         ret = -EINVAL;
1253                         goto error;
1254                 }
1255
1256                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1257                         if (mad_agent_priv->agent.rmpp_version) {
1258                                 ret = -EINVAL;
1259                                 goto error;
1260                         }
1261                 }
1262
1263                 /*
1264                  * Save pointer to next work request to post in case the
1265                  * current one completes, and the user modifies the work
1266                  * request associated with the completion
1267                  */
1268                 next_send_buf = send_buf->next;
1269                 mad_send_wr->send_wr.ah = send_buf->ah;
1270
1271                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1272                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1273                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1274                                                      mad_send_wr);
1275                         if (ret < 0)            /* error */
1276                                 goto error;
1277                         else if (ret == 1)      /* locally consumed */
1278                                 continue;
1279                 }
1280
1281                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1282                 /* Timeout will be updated after send completes */
1283                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1284                 mad_send_wr->max_retries = send_buf->retries;
1285                 mad_send_wr->retries_left = send_buf->retries;
1286                 send_buf->retries = 0;
1287                 /* Reference for work request to QP + response */
1288                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1289                 mad_send_wr->status = IB_WC_SUCCESS;
1290
1291                 /* Reference MAD agent until send completes */
1292                 atomic_inc(&mad_agent_priv->refcount);
1293                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1294                 list_add_tail(&mad_send_wr->agent_list,
1295                               &mad_agent_priv->send_list);
1296                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1297
1298                 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1299                         ret = ib_send_rmpp_mad(mad_send_wr);
1300                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1301                                 ret = ib_send_mad(mad_send_wr);
1302                 } else
1303                         ret = ib_send_mad(mad_send_wr);
1304                 if (ret < 0) {
1305                         /* Fail send request */
1306                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1307                         list_del(&mad_send_wr->agent_list);
1308                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1309                         atomic_dec(&mad_agent_priv->refcount);
1310                         goto error;
1311                 }
1312         }
1313         return 0;
1314 error:
1315         if (bad_send_buf)
1316                 *bad_send_buf = send_buf;
1317         return ret;
1318 }
1319 EXPORT_SYMBOL(ib_post_send_mad);
1320
1321 /*
1322  * ib_free_recv_mad - Returns data buffers used to receive
1323  *  a MAD to the access layer
1324  */
1325 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1326 {
1327         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1328         struct ib_mad_private_header *mad_priv_hdr;
1329         struct ib_mad_private *priv;
1330         struct list_head free_list;
1331
1332         INIT_LIST_HEAD(&free_list);
1333         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1334
1335         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1336                                         &free_list, list) {
1337                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1338                                            recv_buf);
1339                 mad_priv_hdr = container_of(mad_recv_wc,
1340                                             struct ib_mad_private_header,
1341                                             recv_wc);
1342                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1343                                     header);
1344                 kfree(priv);
1345         }
1346 }
1347 EXPORT_SYMBOL(ib_free_recv_mad);
1348
1349 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1350                                         u8 rmpp_version,
1351                                         ib_mad_send_handler send_handler,
1352                                         ib_mad_recv_handler recv_handler,
1353                                         void *context)
1354 {
1355         return ERR_PTR(-EINVAL);        /* XXX: for now */
1356 }
1357 EXPORT_SYMBOL(ib_redirect_mad_qp);
1358
1359 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1360                       struct ib_wc *wc)
1361 {
1362         dev_err(&mad_agent->device->dev,
1363                 "ib_process_mad_wc() not implemented yet\n");
1364         return 0;
1365 }
1366 EXPORT_SYMBOL(ib_process_mad_wc);
1367
1368 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1369                          struct ib_mad_reg_req *mad_reg_req)
1370 {
1371         int i;
1372
1373         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1374                 if ((*method)->agent[i]) {
1375                         pr_err("Method %d already in use\n", i);
1376                         return -EINVAL;
1377                 }
1378         }
1379         return 0;
1380 }
1381
1382 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1383 {
1384         /* Allocate management method table */
1385         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1386         return (*method) ? 0 : (-ENOMEM);
1387 }
1388
1389 /*
1390  * Check to see if there are any methods still in use
1391  */
1392 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1393 {
1394         int i;
1395
1396         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1397                 if (method->agent[i])
1398                         return 1;
1399         return 0;
1400 }
1401
1402 /*
1403  * Check to see if there are any method tables for this class still in use
1404  */
1405 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1406 {
1407         int i;
1408
1409         for (i = 0; i < MAX_MGMT_CLASS; i++)
1410                 if (class->method_table[i])
1411                         return 1;
1412         return 0;
1413 }
1414
1415 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1416 {
1417         int i;
1418
1419         for (i = 0; i < MAX_MGMT_OUI; i++)
1420                 if (vendor_class->method_table[i])
1421                         return 1;
1422         return 0;
1423 }
1424
1425 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1426                            const char *oui)
1427 {
1428         int i;
1429
1430         for (i = 0; i < MAX_MGMT_OUI; i++)
1431                 /* Is there matching OUI for this vendor class ? */
1432                 if (!memcmp(vendor_class->oui[i], oui, 3))
1433                         return i;
1434
1435         return -1;
1436 }
1437
1438 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1439 {
1440         int i;
1441
1442         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1443                 if (vendor->vendor_class[i])
1444                         return 1;
1445
1446         return 0;
1447 }
1448
1449 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1450                                      struct ib_mad_agent_private *agent)
1451 {
1452         int i;
1453
1454         /* Remove any methods for this mad agent */
1455         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1456                 if (method->agent[i] == agent) {
1457                         method->agent[i] = NULL;
1458                 }
1459         }
1460 }
1461
1462 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1463                               struct ib_mad_agent_private *agent_priv,
1464                               u8 mgmt_class)
1465 {
1466         struct ib_mad_port_private *port_priv;
1467         struct ib_mad_mgmt_class_table **class;
1468         struct ib_mad_mgmt_method_table **method;
1469         int i, ret;
1470
1471         port_priv = agent_priv->qp_info->port_priv;
1472         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1473         if (!*class) {
1474                 /* Allocate management class table for "new" class version */
1475                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1476                 if (!*class) {
1477                         ret = -ENOMEM;
1478                         goto error1;
1479                 }
1480
1481                 /* Allocate method table for this management class */
1482                 method = &(*class)->method_table[mgmt_class];
1483                 if ((ret = allocate_method_table(method)))
1484                         goto error2;
1485         } else {
1486                 method = &(*class)->method_table[mgmt_class];
1487                 if (!*method) {
1488                         /* Allocate method table for this management class */
1489                         if ((ret = allocate_method_table(method)))
1490                                 goto error1;
1491                 }
1492         }
1493
1494         /* Now, make sure methods are not already in use */
1495         if (method_in_use(method, mad_reg_req))
1496                 goto error3;
1497
1498         /* Finally, add in methods being registered */
1499         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1500                 (*method)->agent[i] = agent_priv;
1501
1502         return 0;
1503
1504 error3:
1505         /* Remove any methods for this mad agent */
1506         remove_methods_mad_agent(*method, agent_priv);
1507         /* Now, check to see if there are any methods in use */
1508         if (!check_method_table(*method)) {
1509                 /* If not, release management method table */
1510                 kfree(*method);
1511                 *method = NULL;
1512         }
1513         ret = -EINVAL;
1514         goto error1;
1515 error2:
1516         kfree(*class);
1517         *class = NULL;
1518 error1:
1519         return ret;
1520 }
1521
1522 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1523                            struct ib_mad_agent_private *agent_priv)
1524 {
1525         struct ib_mad_port_private *port_priv;
1526         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1527         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1528         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1529         struct ib_mad_mgmt_method_table **method;
1530         int i, ret = -ENOMEM;
1531         u8 vclass;
1532
1533         /* "New" vendor (with OUI) class */
1534         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1535         port_priv = agent_priv->qp_info->port_priv;
1536         vendor_table = &port_priv->version[
1537                                 mad_reg_req->mgmt_class_version].vendor;
1538         if (!*vendor_table) {
1539                 /* Allocate mgmt vendor class table for "new" class version */
1540                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1541                 if (!vendor)
1542                         goto error1;
1543
1544                 *vendor_table = vendor;
1545         }
1546         if (!(*vendor_table)->vendor_class[vclass]) {
1547                 /* Allocate table for this management vendor class */
1548                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1549                 if (!vendor_class)
1550                         goto error2;
1551
1552                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1553         }
1554         for (i = 0; i < MAX_MGMT_OUI; i++) {
1555                 /* Is there matching OUI for this vendor class ? */
1556                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1557                             mad_reg_req->oui, 3)) {
1558                         method = &(*vendor_table)->vendor_class[
1559                                                 vclass]->method_table[i];
1560                         BUG_ON(!*method);
1561                         goto check_in_use;
1562                 }
1563         }
1564         for (i = 0; i < MAX_MGMT_OUI; i++) {
1565                 /* OUI slot available ? */
1566                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1567                                 vclass]->oui[i])) {
1568                         method = &(*vendor_table)->vendor_class[
1569                                 vclass]->method_table[i];
1570                         BUG_ON(*method);
1571                         /* Allocate method table for this OUI */
1572                         if ((ret = allocate_method_table(method)))
1573                                 goto error3;
1574                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1575                                mad_reg_req->oui, 3);
1576                         goto check_in_use;
1577                 }
1578         }
1579         dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1580         goto error3;
1581
1582 check_in_use:
1583         /* Now, make sure methods are not already in use */
1584         if (method_in_use(method, mad_reg_req))
1585                 goto error4;
1586
1587         /* Finally, add in methods being registered */
1588         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1589                 (*method)->agent[i] = agent_priv;
1590
1591         return 0;
1592
1593 error4:
1594         /* Remove any methods for this mad agent */
1595         remove_methods_mad_agent(*method, agent_priv);
1596         /* Now, check to see if there are any methods in use */
1597         if (!check_method_table(*method)) {
1598                 /* If not, release management method table */
1599                 kfree(*method);
1600                 *method = NULL;
1601         }
1602         ret = -EINVAL;
1603 error3:
1604         if (vendor_class) {
1605                 (*vendor_table)->vendor_class[vclass] = NULL;
1606                 kfree(vendor_class);
1607         }
1608 error2:
1609         if (vendor) {
1610                 *vendor_table = NULL;
1611                 kfree(vendor);
1612         }
1613 error1:
1614         return ret;
1615 }
1616
1617 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1618 {
1619         struct ib_mad_port_private *port_priv;
1620         struct ib_mad_mgmt_class_table *class;
1621         struct ib_mad_mgmt_method_table *method;
1622         struct ib_mad_mgmt_vendor_class_table *vendor;
1623         struct ib_mad_mgmt_vendor_class *vendor_class;
1624         int index;
1625         u8 mgmt_class;
1626
1627         /*
1628          * Was MAD registration request supplied
1629          * with original registration ?
1630          */
1631         if (!agent_priv->reg_req) {
1632                 goto out;
1633         }
1634
1635         port_priv = agent_priv->qp_info->port_priv;
1636         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1637         class = port_priv->version[
1638                         agent_priv->reg_req->mgmt_class_version].class;
1639         if (!class)
1640                 goto vendor_check;
1641
1642         method = class->method_table[mgmt_class];
1643         if (method) {
1644                 /* Remove any methods for this mad agent */
1645                 remove_methods_mad_agent(method, agent_priv);
1646                 /* Now, check to see if there are any methods still in use */
1647                 if (!check_method_table(method)) {
1648                         /* If not, release management method table */
1649                         kfree(method);
1650                         class->method_table[mgmt_class] = NULL;
1651                         /* Any management classes left ? */
1652                         if (!check_class_table(class)) {
1653                                 /* If not, release management class table */
1654                                 kfree(class);
1655                                 port_priv->version[
1656                                         agent_priv->reg_req->
1657                                         mgmt_class_version].class = NULL;
1658                         }
1659                 }
1660         }
1661
1662 vendor_check:
1663         if (!is_vendor_class(mgmt_class))
1664                 goto out;
1665
1666         /* normalize mgmt_class to vendor range 2 */
1667         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1668         vendor = port_priv->version[
1669                         agent_priv->reg_req->mgmt_class_version].vendor;
1670
1671         if (!vendor)
1672                 goto out;
1673
1674         vendor_class = vendor->vendor_class[mgmt_class];
1675         if (vendor_class) {
1676                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1677                 if (index < 0)
1678                         goto out;
1679                 method = vendor_class->method_table[index];
1680                 if (method) {
1681                         /* Remove any methods for this mad agent */
1682                         remove_methods_mad_agent(method, agent_priv);
1683                         /*
1684                          * Now, check to see if there are
1685                          * any methods still in use
1686                          */
1687                         if (!check_method_table(method)) {
1688                                 /* If not, release management method table */
1689                                 kfree(method);
1690                                 vendor_class->method_table[index] = NULL;
1691                                 memset(vendor_class->oui[index], 0, 3);
1692                                 /* Any OUIs left ? */
1693                                 if (!check_vendor_class(vendor_class)) {
1694                                         /* If not, release vendor class table */
1695                                         kfree(vendor_class);
1696                                         vendor->vendor_class[mgmt_class] = NULL;
1697                                         /* Any other vendor classes left ? */
1698                                         if (!check_vendor_table(vendor)) {
1699                                                 kfree(vendor);
1700                                                 port_priv->version[
1701                                                         agent_priv->reg_req->
1702                                                         mgmt_class_version].
1703                                                         vendor = NULL;
1704                                         }
1705                                 }
1706                         }
1707                 }
1708         }
1709
1710 out:
1711         return;
1712 }
1713
1714 static struct ib_mad_agent_private *
1715 find_mad_agent(struct ib_mad_port_private *port_priv,
1716                const struct ib_mad_hdr *mad_hdr)
1717 {
1718         struct ib_mad_agent_private *mad_agent = NULL;
1719         unsigned long flags;
1720
1721         spin_lock_irqsave(&port_priv->reg_lock, flags);
1722         if (ib_response_mad(mad_hdr)) {
1723                 u32 hi_tid;
1724                 struct ib_mad_agent_private *entry;
1725
1726                 /*
1727                  * Routing is based on high 32 bits of transaction ID
1728                  * of MAD.
1729                  */
1730                 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1731                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1732                         if (entry->agent.hi_tid == hi_tid) {
1733                                 mad_agent = entry;
1734                                 break;
1735                         }
1736                 }
1737         } else {
1738                 struct ib_mad_mgmt_class_table *class;
1739                 struct ib_mad_mgmt_method_table *method;
1740                 struct ib_mad_mgmt_vendor_class_table *vendor;
1741                 struct ib_mad_mgmt_vendor_class *vendor_class;
1742                 const struct ib_vendor_mad *vendor_mad;
1743                 int index;
1744
1745                 /*
1746                  * Routing is based on version, class, and method
1747                  * For "newer" vendor MADs, also based on OUI
1748                  */
1749                 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1750                         goto out;
1751                 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1752                         class = port_priv->version[
1753                                         mad_hdr->class_version].class;
1754                         if (!class)
1755                                 goto out;
1756                         if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1757                             ARRAY_SIZE(class->method_table))
1758                                 goto out;
1759                         method = class->method_table[convert_mgmt_class(
1760                                                         mad_hdr->mgmt_class)];
1761                         if (method)
1762                                 mad_agent = method->agent[mad_hdr->method &
1763                                                           ~IB_MGMT_METHOD_RESP];
1764                 } else {
1765                         vendor = port_priv->version[
1766                                         mad_hdr->class_version].vendor;
1767                         if (!vendor)
1768                                 goto out;
1769                         vendor_class = vendor->vendor_class[vendor_class_index(
1770                                                 mad_hdr->mgmt_class)];
1771                         if (!vendor_class)
1772                                 goto out;
1773                         /* Find matching OUI */
1774                         vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1775                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1776                         if (index == -1)
1777                                 goto out;
1778                         method = vendor_class->method_table[index];
1779                         if (method) {
1780                                 mad_agent = method->agent[mad_hdr->method &
1781                                                           ~IB_MGMT_METHOD_RESP];
1782                         }
1783                 }
1784         }
1785
1786         if (mad_agent) {
1787                 if (mad_agent->agent.recv_handler)
1788                         atomic_inc(&mad_agent->refcount);
1789                 else {
1790                         dev_notice(&port_priv->device->dev,
1791                                    "No receive handler for client %p on port %d\n",
1792                                    &mad_agent->agent, port_priv->port_num);
1793                         mad_agent = NULL;
1794                 }
1795         }
1796 out:
1797         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1798
1799         return mad_agent;
1800 }
1801
1802 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1803                         const struct ib_mad_qp_info *qp_info,
1804                         bool opa)
1805 {
1806         int valid = 0;
1807         u32 qp_num = qp_info->qp->qp_num;
1808
1809         /* Make sure MAD base version is understood */
1810         if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1811             (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1812                 pr_err("MAD received with unsupported base version %d %s\n",
1813                        mad_hdr->base_version, opa ? "(opa)" : "");
1814                 goto out;
1815         }
1816
1817         /* Filter SMI packets sent to other than QP0 */
1818         if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1819             (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1820                 if (qp_num == 0)
1821                         valid = 1;
1822         } else {
1823                 /* CM attributes other than ClassPortInfo only use Send method */
1824                 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1825                     (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1826                     (mad_hdr->method != IB_MGMT_METHOD_SEND))
1827                         goto out;
1828                 /* Filter GSI packets sent to QP0 */
1829                 if (qp_num != 0)
1830                         valid = 1;
1831         }
1832
1833 out:
1834         return valid;
1835 }
1836
1837 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1838                             const struct ib_mad_hdr *mad_hdr)
1839 {
1840         struct ib_rmpp_mad *rmpp_mad;
1841
1842         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1843         return !mad_agent_priv->agent.rmpp_version ||
1844                 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1845                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1846                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1847                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1848 }
1849
1850 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1851                                      const struct ib_mad_recv_wc *rwc)
1852 {
1853         return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1854                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1855 }
1856
1857 static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1858                                    const struct ib_mad_send_wr_private *wr,
1859                                    const struct ib_mad_recv_wc *rwc )
1860 {
1861         struct rdma_ah_attr attr;
1862         u8 send_resp, rcv_resp;
1863         union ib_gid sgid;
1864         struct ib_device *device = mad_agent_priv->agent.device;
1865         u8 port_num = mad_agent_priv->agent.port_num;
1866         u8 lmc;
1867         bool has_grh;
1868
1869         send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1870         rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1871
1872         if (send_resp == rcv_resp)
1873                 /* both requests, or both responses. GIDs different */
1874                 return 0;
1875
1876         if (rdma_query_ah(wr->send_buf.ah, &attr))
1877                 /* Assume not equal, to avoid false positives. */
1878                 return 0;
1879
1880         has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1881         if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1882                 /* one has GID, other does not.  Assume different */
1883                 return 0;
1884
1885         if (!send_resp && rcv_resp) {
1886                 /* is request/response. */
1887                 if (!has_grh) {
1888                         if (ib_get_cached_lmc(device, port_num, &lmc))
1889                                 return 0;
1890                         return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1891                                            rwc->wc->dlid_path_bits) &
1892                                           ((1 << lmc) - 1)));
1893                 } else {
1894                         const struct ib_global_route *grh =
1895                                         rdma_ah_read_grh(&attr);
1896
1897                         if (ib_get_cached_gid(device, port_num,
1898                                               grh->sgid_index, &sgid, NULL))
1899                                 return 0;
1900                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1901                                        16);
1902                 }
1903         }
1904
1905         if (!has_grh)
1906                 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1907         else
1908                 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1909                                rwc->recv_buf.grh->sgid.raw,
1910                                16);
1911 }
1912
1913 static inline int is_direct(u8 class)
1914 {
1915         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1916 }
1917
1918 struct ib_mad_send_wr_private*
1919 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1920                  const struct ib_mad_recv_wc *wc)
1921 {
1922         struct ib_mad_send_wr_private *wr;
1923         const struct ib_mad_hdr *mad_hdr;
1924
1925         mad_hdr = &wc->recv_buf.mad->mad_hdr;
1926
1927         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1928                 if ((wr->tid == mad_hdr->tid) &&
1929                     rcv_has_same_class(wr, wc) &&
1930                     /*
1931                      * Don't check GID for direct routed MADs.
1932                      * These might have permissive LIDs.
1933                      */
1934                     (is_direct(mad_hdr->mgmt_class) ||
1935                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1936                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1937         }
1938
1939         /*
1940          * It's possible to receive the response before we've
1941          * been notified that the send has completed
1942          */
1943         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1944                 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1945                     wr->tid == mad_hdr->tid &&
1946                     wr->timeout &&
1947                     rcv_has_same_class(wr, wc) &&
1948                     /*
1949                      * Don't check GID for direct routed MADs.
1950                      * These might have permissive LIDs.
1951                      */
1952                     (is_direct(mad_hdr->mgmt_class) ||
1953                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1954                         /* Verify request has not been canceled */
1955                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1956         }
1957         return NULL;
1958 }
1959
1960 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1961 {
1962         mad_send_wr->timeout = 0;
1963         if (mad_send_wr->refcount == 1)
1964                 list_move_tail(&mad_send_wr->agent_list,
1965                               &mad_send_wr->mad_agent_priv->done_list);
1966 }
1967
1968 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1969                                  struct ib_mad_recv_wc *mad_recv_wc)
1970 {
1971         struct ib_mad_send_wr_private *mad_send_wr;
1972         struct ib_mad_send_wc mad_send_wc;
1973         unsigned long flags;
1974         int ret;
1975
1976         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1977         ret = ib_mad_enforce_security(mad_agent_priv,
1978                                       mad_recv_wc->wc->pkey_index);
1979         if (ret) {
1980                 ib_free_recv_mad(mad_recv_wc);
1981                 deref_mad_agent(mad_agent_priv);
1982                 return;
1983         }
1984
1985         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1986         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1987                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1988                                                       mad_recv_wc);
1989                 if (!mad_recv_wc) {
1990                         deref_mad_agent(mad_agent_priv);
1991                         return;
1992                 }
1993         }
1994
1995         /* Complete corresponding request */
1996         if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1997                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1998                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1999                 if (!mad_send_wr) {
2000                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2001                         if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
2002                            && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
2003                            && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
2004                                         & IB_MGMT_RMPP_FLAG_ACTIVE)) {
2005                                 /* user rmpp is in effect
2006                                  * and this is an active RMPP MAD
2007                                  */
2008                                 mad_agent_priv->agent.recv_handler(
2009                                                 &mad_agent_priv->agent, NULL,
2010                                                 mad_recv_wc);
2011                                 atomic_dec(&mad_agent_priv->refcount);
2012                         } else {
2013                                 /* not user rmpp, revert to normal behavior and
2014                                  * drop the mad */
2015                                 ib_free_recv_mad(mad_recv_wc);
2016                                 deref_mad_agent(mad_agent_priv);
2017                                 return;
2018                         }
2019                 } else {
2020                         ib_mark_mad_done(mad_send_wr);
2021                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2022
2023                         /* Defined behavior is to complete response before request */
2024                         mad_agent_priv->agent.recv_handler(
2025                                         &mad_agent_priv->agent,
2026                                         &mad_send_wr->send_buf,
2027                                         mad_recv_wc);
2028                         atomic_dec(&mad_agent_priv->refcount);
2029
2030                         mad_send_wc.status = IB_WC_SUCCESS;
2031                         mad_send_wc.vendor_err = 0;
2032                         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2033                         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2034                 }
2035         } else {
2036                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2037                                                    mad_recv_wc);
2038                 deref_mad_agent(mad_agent_priv);
2039         }
2040
2041         return;
2042 }
2043
2044 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
2045                                      const struct ib_mad_qp_info *qp_info,
2046                                      const struct ib_wc *wc,
2047                                      int port_num,
2048                                      struct ib_mad_private *recv,
2049                                      struct ib_mad_private *response)
2050 {
2051         enum smi_forward_action retsmi;
2052         struct ib_smp *smp = (struct ib_smp *)recv->mad;
2053
2054         if (smi_handle_dr_smp_recv(smp,
2055                                    rdma_cap_ib_switch(port_priv->device),
2056                                    port_num,
2057                                    port_priv->device->phys_port_cnt) ==
2058                                    IB_SMI_DISCARD)
2059                 return IB_SMI_DISCARD;
2060
2061         retsmi = smi_check_forward_dr_smp(smp);
2062         if (retsmi == IB_SMI_LOCAL)
2063                 return IB_SMI_HANDLE;
2064
2065         if (retsmi == IB_SMI_SEND) { /* don't forward */
2066                 if (smi_handle_dr_smp_send(smp,
2067                                            rdma_cap_ib_switch(port_priv->device),
2068                                            port_num) == IB_SMI_DISCARD)
2069                         return IB_SMI_DISCARD;
2070
2071                 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2072                         return IB_SMI_DISCARD;
2073         } else if (rdma_cap_ib_switch(port_priv->device)) {
2074                 /* forward case for switches */
2075                 memcpy(response, recv, mad_priv_size(response));
2076                 response->header.recv_wc.wc = &response->header.wc;
2077                 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2078                 response->header.recv_wc.recv_buf.grh = &response->grh;
2079
2080                 agent_send_response((const struct ib_mad_hdr *)response->mad,
2081                                     &response->grh, wc,
2082                                     port_priv->device,
2083                                     smi_get_fwd_port(smp),
2084                                     qp_info->qp->qp_num,
2085                                     response->mad_size,
2086                                     false);
2087
2088                 return IB_SMI_DISCARD;
2089         }
2090         return IB_SMI_HANDLE;
2091 }
2092
2093 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
2094                                     struct ib_mad_private *response,
2095                                     size_t *resp_len, bool opa)
2096 {
2097         const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
2098         struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
2099
2100         if (recv_hdr->method == IB_MGMT_METHOD_GET ||
2101             recv_hdr->method == IB_MGMT_METHOD_SET) {
2102                 memcpy(response, recv, mad_priv_size(response));
2103                 response->header.recv_wc.wc = &response->header.wc;
2104                 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2105                 response->header.recv_wc.recv_buf.grh = &response->grh;
2106                 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
2107                 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
2108                 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2109                         resp_hdr->status |= IB_SMP_DIRECTION;
2110
2111                 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
2112                         if (recv_hdr->mgmt_class ==
2113                             IB_MGMT_CLASS_SUBN_LID_ROUTED ||
2114                             recv_hdr->mgmt_class ==
2115                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
2116                                 *resp_len = opa_get_smp_header_size(
2117                                                         (struct opa_smp *)recv->mad);
2118                         else
2119                                 *resp_len = sizeof(struct ib_mad_hdr);
2120                 }
2121
2122                 return true;
2123         } else {
2124                 return false;
2125         }
2126 }
2127
2128 static enum smi_action
2129 handle_opa_smi(struct ib_mad_port_private *port_priv,
2130                struct ib_mad_qp_info *qp_info,
2131                struct ib_wc *wc,
2132                int port_num,
2133                struct ib_mad_private *recv,
2134                struct ib_mad_private *response)
2135 {
2136         enum smi_forward_action retsmi;
2137         struct opa_smp *smp = (struct opa_smp *)recv->mad;
2138
2139         if (opa_smi_handle_dr_smp_recv(smp,
2140                                    rdma_cap_ib_switch(port_priv->device),
2141                                    port_num,
2142                                    port_priv->device->phys_port_cnt) ==
2143                                    IB_SMI_DISCARD)
2144                 return IB_SMI_DISCARD;
2145
2146         retsmi = opa_smi_check_forward_dr_smp(smp);
2147         if (retsmi == IB_SMI_LOCAL)
2148                 return IB_SMI_HANDLE;
2149
2150         if (retsmi == IB_SMI_SEND) { /* don't forward */
2151                 if (opa_smi_handle_dr_smp_send(smp,
2152                                            rdma_cap_ib_switch(port_priv->device),
2153                                            port_num) == IB_SMI_DISCARD)
2154                         return IB_SMI_DISCARD;
2155
2156                 if (opa_smi_check_local_smp(smp, port_priv->device) ==
2157                     IB_SMI_DISCARD)
2158                         return IB_SMI_DISCARD;
2159
2160         } else if (rdma_cap_ib_switch(port_priv->device)) {
2161                 /* forward case for switches */
2162                 memcpy(response, recv, mad_priv_size(response));
2163                 response->header.recv_wc.wc = &response->header.wc;
2164                 response->header.recv_wc.recv_buf.opa_mad =
2165                                 (struct opa_mad *)response->mad;
2166                 response->header.recv_wc.recv_buf.grh = &response->grh;
2167
2168                 agent_send_response((const struct ib_mad_hdr *)response->mad,
2169                                     &response->grh, wc,
2170                                     port_priv->device,
2171                                     opa_smi_get_fwd_port(smp),
2172                                     qp_info->qp->qp_num,
2173                                     recv->header.wc.byte_len,
2174                                     true);
2175
2176                 return IB_SMI_DISCARD;
2177         }
2178
2179         return IB_SMI_HANDLE;
2180 }
2181
2182 static enum smi_action
2183 handle_smi(struct ib_mad_port_private *port_priv,
2184            struct ib_mad_qp_info *qp_info,
2185            struct ib_wc *wc,
2186            int port_num,
2187            struct ib_mad_private *recv,
2188            struct ib_mad_private *response,
2189            bool opa)
2190 {
2191         struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2192
2193         if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2194             mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2195                 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2196                                       response);
2197
2198         return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2199 }
2200
2201 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2202 {
2203         struct ib_mad_port_private *port_priv = cq->cq_context;
2204         struct ib_mad_list_head *mad_list =
2205                 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2206         struct ib_mad_qp_info *qp_info;
2207         struct ib_mad_private_header *mad_priv_hdr;
2208         struct ib_mad_private *recv, *response = NULL;
2209         struct ib_mad_agent_private *mad_agent;
2210         int port_num;
2211         int ret = IB_MAD_RESULT_SUCCESS;
2212         size_t mad_size;
2213         u16 resp_mad_pkey_index = 0;
2214         bool opa;
2215
2216         if (list_empty_careful(&port_priv->port_list))
2217                 return;
2218
2219         if (wc->status != IB_WC_SUCCESS) {
2220                 /*
2221                  * Receive errors indicate that the QP has entered the error
2222                  * state - error handling/shutdown code will cleanup
2223                  */
2224                 return;
2225         }
2226
2227         qp_info = mad_list->mad_queue->qp_info;
2228         dequeue_mad(mad_list);
2229
2230         opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2231                                qp_info->port_priv->port_num);
2232
2233         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2234                                     mad_list);
2235         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2236         ib_dma_unmap_single(port_priv->device,
2237                             recv->header.mapping,
2238                             mad_priv_dma_size(recv),
2239                             DMA_FROM_DEVICE);
2240
2241         /* Setup MAD receive work completion from "normal" work completion */
2242         recv->header.wc = *wc;
2243         recv->header.recv_wc.wc = &recv->header.wc;
2244
2245         if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2246                 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2247                 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2248         } else {
2249                 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2250                 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2251         }
2252
2253         recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2254         recv->header.recv_wc.recv_buf.grh = &recv->grh;
2255
2256         if (atomic_read(&qp_info->snoop_count))
2257                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
2258
2259         /* Validate MAD */
2260         if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2261                 goto out;
2262
2263         mad_size = recv->mad_size;
2264         response = alloc_mad_private(mad_size, GFP_KERNEL);
2265         if (!response)
2266                 goto out;
2267
2268         if (rdma_cap_ib_switch(port_priv->device))
2269                 port_num = wc->port_num;
2270         else
2271                 port_num = port_priv->port_num;
2272
2273         if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2274             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2275                 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2276                                response, opa)
2277                     == IB_SMI_DISCARD)
2278                         goto out;
2279         }
2280
2281         /* Give driver "right of first refusal" on incoming MAD */
2282         if (port_priv->device->process_mad) {
2283                 ret = port_priv->device->process_mad(port_priv->device, 0,
2284                                                      port_priv->port_num,
2285                                                      wc, &recv->grh,
2286                                                      (const struct ib_mad_hdr *)recv->mad,
2287                                                      recv->mad_size,
2288                                                      (struct ib_mad_hdr *)response->mad,
2289                                                      &mad_size, &resp_mad_pkey_index);
2290
2291                 if (opa)
2292                         wc->pkey_index = resp_mad_pkey_index;
2293
2294                 if (ret & IB_MAD_RESULT_SUCCESS) {
2295                         if (ret & IB_MAD_RESULT_CONSUMED)
2296                                 goto out;
2297                         if (ret & IB_MAD_RESULT_REPLY) {
2298                                 agent_send_response((const struct ib_mad_hdr *)response->mad,
2299                                                     &recv->grh, wc,
2300                                                     port_priv->device,
2301                                                     port_num,
2302                                                     qp_info->qp->qp_num,
2303                                                     mad_size, opa);
2304                                 goto out;
2305                         }
2306                 }
2307         }
2308
2309         mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2310         if (mad_agent) {
2311                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2312                 /*
2313                  * recv is freed up in error cases in ib_mad_complete_recv
2314                  * or via recv_handler in ib_mad_complete_recv()
2315                  */
2316                 recv = NULL;
2317         } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2318                    generate_unmatched_resp(recv, response, &mad_size, opa)) {
2319                 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2320                                     port_priv->device, port_num,
2321                                     qp_info->qp->qp_num, mad_size, opa);
2322         }
2323
2324 out:
2325         /* Post another receive request for this QP */
2326         if (response) {
2327                 ib_mad_post_receive_mads(qp_info, response);
2328                 kfree(recv);
2329         } else
2330                 ib_mad_post_receive_mads(qp_info, recv);
2331 }
2332
2333 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2334 {
2335         struct ib_mad_send_wr_private *mad_send_wr;
2336         unsigned long delay;
2337
2338         if (list_empty(&mad_agent_priv->wait_list)) {
2339                 cancel_delayed_work(&mad_agent_priv->timed_work);
2340         } else {
2341                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2342                                          struct ib_mad_send_wr_private,
2343                                          agent_list);
2344
2345                 if (time_after(mad_agent_priv->timeout,
2346                                mad_send_wr->timeout)) {
2347                         mad_agent_priv->timeout = mad_send_wr->timeout;
2348                         delay = mad_send_wr->timeout - jiffies;
2349                         if ((long)delay <= 0)
2350                                 delay = 1;
2351                         mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2352                                          &mad_agent_priv->timed_work, delay);
2353                 }
2354         }
2355 }
2356
2357 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2358 {
2359         struct ib_mad_agent_private *mad_agent_priv;
2360         struct ib_mad_send_wr_private *temp_mad_send_wr;
2361         struct list_head *list_item;
2362         unsigned long delay;
2363
2364         mad_agent_priv = mad_send_wr->mad_agent_priv;
2365         list_del(&mad_send_wr->agent_list);
2366
2367         delay = mad_send_wr->timeout;
2368         mad_send_wr->timeout += jiffies;
2369
2370         if (delay) {
2371                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2372                         temp_mad_send_wr = list_entry(list_item,
2373                                                 struct ib_mad_send_wr_private,
2374                                                 agent_list);
2375                         if (time_after(mad_send_wr->timeout,
2376                                        temp_mad_send_wr->timeout))
2377                                 break;
2378                 }
2379         }
2380         else
2381                 list_item = &mad_agent_priv->wait_list;
2382         list_add(&mad_send_wr->agent_list, list_item);
2383
2384         /* Reschedule a work item if we have a shorter timeout */
2385         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2386                 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2387                                  &mad_agent_priv->timed_work, delay);
2388 }
2389
2390 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2391                           int timeout_ms)
2392 {
2393         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2394         wait_for_response(mad_send_wr);
2395 }
2396
2397 /*
2398  * Process a send work completion
2399  */
2400 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2401                              struct ib_mad_send_wc *mad_send_wc)
2402 {
2403         struct ib_mad_agent_private     *mad_agent_priv;
2404         unsigned long                   flags;
2405         int                             ret;
2406
2407         mad_agent_priv = mad_send_wr->mad_agent_priv;
2408         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2409         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2410                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2411                 if (ret == IB_RMPP_RESULT_CONSUMED)
2412                         goto done;
2413         } else
2414                 ret = IB_RMPP_RESULT_UNHANDLED;
2415
2416         if (mad_send_wc->status != IB_WC_SUCCESS &&
2417             mad_send_wr->status == IB_WC_SUCCESS) {
2418                 mad_send_wr->status = mad_send_wc->status;
2419                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2420         }
2421
2422         if (--mad_send_wr->refcount > 0) {
2423                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2424                     mad_send_wr->status == IB_WC_SUCCESS) {
2425                         wait_for_response(mad_send_wr);
2426                 }
2427                 goto done;
2428         }
2429
2430         /* Remove send from MAD agent and notify client of completion */
2431         list_del(&mad_send_wr->agent_list);
2432         adjust_timeout(mad_agent_priv);
2433         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2434
2435         if (mad_send_wr->status != IB_WC_SUCCESS )
2436                 mad_send_wc->status = mad_send_wr->status;
2437         if (ret == IB_RMPP_RESULT_INTERNAL)
2438                 ib_rmpp_send_handler(mad_send_wc);
2439         else
2440                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2441                                                    mad_send_wc);
2442
2443         /* Release reference on agent taken when sending */
2444         deref_mad_agent(mad_agent_priv);
2445         return;
2446 done:
2447         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2448 }
2449
2450 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2451 {
2452         struct ib_mad_port_private *port_priv = cq->cq_context;
2453         struct ib_mad_list_head *mad_list =
2454                 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2455         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2456         struct ib_mad_qp_info           *qp_info;
2457         struct ib_mad_queue             *send_queue;
2458         struct ib_send_wr               *bad_send_wr;
2459         struct ib_mad_send_wc           mad_send_wc;
2460         unsigned long flags;
2461         int ret;
2462
2463         if (list_empty_careful(&port_priv->port_list))
2464                 return;
2465
2466         if (wc->status != IB_WC_SUCCESS) {
2467                 if (!ib_mad_send_error(port_priv, wc))
2468                         return;
2469         }
2470
2471         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2472                                    mad_list);
2473         send_queue = mad_list->mad_queue;
2474         qp_info = send_queue->qp_info;
2475
2476 retry:
2477         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2478                             mad_send_wr->header_mapping,
2479                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2480         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2481                             mad_send_wr->payload_mapping,
2482                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2483         queued_send_wr = NULL;
2484         spin_lock_irqsave(&send_queue->lock, flags);
2485         list_del(&mad_list->list);
2486
2487         /* Move queued send to the send queue */
2488         if (send_queue->count-- > send_queue->max_active) {
2489                 mad_list = container_of(qp_info->overflow_list.next,
2490                                         struct ib_mad_list_head, list);
2491                 queued_send_wr = container_of(mad_list,
2492                                         struct ib_mad_send_wr_private,
2493                                         mad_list);
2494                 list_move_tail(&mad_list->list, &send_queue->list);
2495         }
2496         spin_unlock_irqrestore(&send_queue->lock, flags);
2497
2498         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2499         mad_send_wc.status = wc->status;
2500         mad_send_wc.vendor_err = wc->vendor_err;
2501         if (atomic_read(&qp_info->snoop_count))
2502                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2503                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2504         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2505
2506         if (queued_send_wr) {
2507                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2508                                    &bad_send_wr);
2509                 if (ret) {
2510                         dev_err(&port_priv->device->dev,
2511                                 "ib_post_send failed: %d\n", ret);
2512                         mad_send_wr = queued_send_wr;
2513                         wc->status = IB_WC_LOC_QP_OP_ERR;
2514                         goto retry;
2515                 }
2516         }
2517 }
2518
2519 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2520 {
2521         struct ib_mad_send_wr_private *mad_send_wr;
2522         struct ib_mad_list_head *mad_list;
2523         unsigned long flags;
2524
2525         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2526         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2527                 mad_send_wr = container_of(mad_list,
2528                                            struct ib_mad_send_wr_private,
2529                                            mad_list);
2530                 mad_send_wr->retry = 1;
2531         }
2532         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2533 }
2534
2535 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2536                 struct ib_wc *wc)
2537 {
2538         struct ib_mad_list_head *mad_list =
2539                 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2540         struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2541         struct ib_mad_send_wr_private *mad_send_wr;
2542         int ret;
2543
2544         /*
2545          * Send errors will transition the QP to SQE - move
2546          * QP to RTS and repost flushed work requests
2547          */
2548         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2549                                    mad_list);
2550         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2551                 if (mad_send_wr->retry) {
2552                         /* Repost send */
2553                         struct ib_send_wr *bad_send_wr;
2554
2555                         mad_send_wr->retry = 0;
2556                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2557                                         &bad_send_wr);
2558                         if (!ret)
2559                                 return false;
2560                 }
2561         } else {
2562                 struct ib_qp_attr *attr;
2563
2564                 /* Transition QP to RTS and fail offending send */
2565                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2566                 if (attr) {
2567                         attr->qp_state = IB_QPS_RTS;
2568                         attr->cur_qp_state = IB_QPS_SQE;
2569                         ret = ib_modify_qp(qp_info->qp, attr,
2570                                            IB_QP_STATE | IB_QP_CUR_STATE);
2571                         kfree(attr);
2572                         if (ret)
2573                                 dev_err(&port_priv->device->dev,
2574                                         "%s - ib_modify_qp to RTS: %d\n",
2575                                         __func__, ret);
2576                         else
2577                                 mark_sends_for_retry(qp_info);
2578                 }
2579         }
2580
2581         return true;
2582 }
2583
2584 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2585 {
2586         unsigned long flags;
2587         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2588         struct ib_mad_send_wc mad_send_wc;
2589         struct list_head cancel_list;
2590
2591         INIT_LIST_HEAD(&cancel_list);
2592
2593         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2594         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2595                                  &mad_agent_priv->send_list, agent_list) {
2596                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2597                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2598                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2599                 }
2600         }
2601
2602         /* Empty wait list to prevent receives from finding a request */
2603         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2604         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2605
2606         /* Report all cancelled requests */
2607         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2608         mad_send_wc.vendor_err = 0;
2609
2610         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2611                                  &cancel_list, agent_list) {
2612                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2613                 list_del(&mad_send_wr->agent_list);
2614                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2615                                                    &mad_send_wc);
2616                 atomic_dec(&mad_agent_priv->refcount);
2617         }
2618 }
2619
2620 static struct ib_mad_send_wr_private*
2621 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2622              struct ib_mad_send_buf *send_buf)
2623 {
2624         struct ib_mad_send_wr_private *mad_send_wr;
2625
2626         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2627                             agent_list) {
2628                 if (&mad_send_wr->send_buf == send_buf)
2629                         return mad_send_wr;
2630         }
2631
2632         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2633                             agent_list) {
2634                 if (is_rmpp_data_mad(mad_agent_priv,
2635                                      mad_send_wr->send_buf.mad) &&
2636                     &mad_send_wr->send_buf == send_buf)
2637                         return mad_send_wr;
2638         }
2639         return NULL;
2640 }
2641
2642 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2643                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2644 {
2645         struct ib_mad_agent_private *mad_agent_priv;
2646         struct ib_mad_send_wr_private *mad_send_wr;
2647         unsigned long flags;
2648         int active;
2649
2650         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2651                                       agent);
2652         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2653         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2654         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2655                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2656                 return -EINVAL;
2657         }
2658
2659         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2660         if (!timeout_ms) {
2661                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2662                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2663         }
2664
2665         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2666         if (active)
2667                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2668         else
2669                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2670
2671         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2672         return 0;
2673 }
2674 EXPORT_SYMBOL(ib_modify_mad);
2675
2676 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2677                    struct ib_mad_send_buf *send_buf)
2678 {
2679         ib_modify_mad(mad_agent, send_buf, 0);
2680 }
2681 EXPORT_SYMBOL(ib_cancel_mad);
2682
2683 static void local_completions(struct work_struct *work)
2684 {
2685         struct ib_mad_agent_private *mad_agent_priv;
2686         struct ib_mad_local_private *local;
2687         struct ib_mad_agent_private *recv_mad_agent;
2688         unsigned long flags;
2689         int free_mad;
2690         struct ib_wc wc;
2691         struct ib_mad_send_wc mad_send_wc;
2692         bool opa;
2693
2694         mad_agent_priv =
2695                 container_of(work, struct ib_mad_agent_private, local_work);
2696
2697         opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2698                                mad_agent_priv->qp_info->port_priv->port_num);
2699
2700         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2701         while (!list_empty(&mad_agent_priv->local_list)) {
2702                 local = list_entry(mad_agent_priv->local_list.next,
2703                                    struct ib_mad_local_private,
2704                                    completion_list);
2705                 list_del(&local->completion_list);
2706                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2707                 free_mad = 0;
2708                 if (local->mad_priv) {
2709                         u8 base_version;
2710                         recv_mad_agent = local->recv_mad_agent;
2711                         if (!recv_mad_agent) {
2712                                 dev_err(&mad_agent_priv->agent.device->dev,
2713                                         "No receive MAD agent for local completion\n");
2714                                 free_mad = 1;
2715                                 goto local_send_completion;
2716                         }
2717
2718                         /*
2719                          * Defined behavior is to complete response
2720                          * before request
2721                          */
2722                         build_smp_wc(recv_mad_agent->agent.qp,
2723                                      local->mad_send_wr->send_wr.wr.wr_cqe,
2724                                      be16_to_cpu(IB_LID_PERMISSIVE),
2725                                      local->mad_send_wr->send_wr.pkey_index,
2726                                      recv_mad_agent->agent.port_num, &wc);
2727
2728                         local->mad_priv->header.recv_wc.wc = &wc;
2729
2730                         base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2731                         if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2732                                 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2733                                 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2734                         } else {
2735                                 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2736                                 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2737                         }
2738
2739                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2740                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2741                                  &local->mad_priv->header.recv_wc.rmpp_list);
2742                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2743                         local->mad_priv->header.recv_wc.recv_buf.mad =
2744                                                 (struct ib_mad *)local->mad_priv->mad;
2745                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2746                                 snoop_recv(recv_mad_agent->qp_info,
2747                                           &local->mad_priv->header.recv_wc,
2748                                            IB_MAD_SNOOP_RECVS);
2749                         recv_mad_agent->agent.recv_handler(
2750                                                 &recv_mad_agent->agent,
2751                                                 &local->mad_send_wr->send_buf,
2752                                                 &local->mad_priv->header.recv_wc);
2753                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2754                         atomic_dec(&recv_mad_agent->refcount);
2755                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2756                 }
2757
2758 local_send_completion:
2759                 /* Complete send */
2760                 mad_send_wc.status = IB_WC_SUCCESS;
2761                 mad_send_wc.vendor_err = 0;
2762                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2763                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2764                         snoop_send(mad_agent_priv->qp_info,
2765                                    &local->mad_send_wr->send_buf,
2766                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2767                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2768                                                    &mad_send_wc);
2769
2770                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2771                 atomic_dec(&mad_agent_priv->refcount);
2772                 if (free_mad)
2773                         kfree(local->mad_priv);
2774                 kfree(local);
2775         }
2776         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2777 }
2778
2779 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2780 {
2781         int ret;
2782
2783         if (!mad_send_wr->retries_left)
2784                 return -ETIMEDOUT;
2785
2786         mad_send_wr->retries_left--;
2787         mad_send_wr->send_buf.retries++;
2788
2789         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2790
2791         if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2792                 ret = ib_retry_rmpp(mad_send_wr);
2793                 switch (ret) {
2794                 case IB_RMPP_RESULT_UNHANDLED:
2795                         ret = ib_send_mad(mad_send_wr);
2796                         break;
2797                 case IB_RMPP_RESULT_CONSUMED:
2798                         ret = 0;
2799                         break;
2800                 default:
2801                         ret = -ECOMM;
2802                         break;
2803                 }
2804         } else
2805                 ret = ib_send_mad(mad_send_wr);
2806
2807         if (!ret) {
2808                 mad_send_wr->refcount++;
2809                 list_add_tail(&mad_send_wr->agent_list,
2810                               &mad_send_wr->mad_agent_priv->send_list);
2811         }
2812         return ret;
2813 }
2814
2815 static void timeout_sends(struct work_struct *work)
2816 {
2817         struct ib_mad_agent_private *mad_agent_priv;
2818         struct ib_mad_send_wr_private *mad_send_wr;
2819         struct ib_mad_send_wc mad_send_wc;
2820         unsigned long flags, delay;
2821
2822         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2823                                       timed_work.work);
2824         mad_send_wc.vendor_err = 0;
2825
2826         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2827         while (!list_empty(&mad_agent_priv->wait_list)) {
2828                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2829                                          struct ib_mad_send_wr_private,
2830                                          agent_list);
2831
2832                 if (time_after(mad_send_wr->timeout, jiffies)) {
2833                         delay = mad_send_wr->timeout - jiffies;
2834                         if ((long)delay <= 0)
2835                                 delay = 1;
2836                         queue_delayed_work(mad_agent_priv->qp_info->
2837                                            port_priv->wq,
2838                                            &mad_agent_priv->timed_work, delay);
2839                         break;
2840                 }
2841
2842                 list_del(&mad_send_wr->agent_list);
2843                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2844                     !retry_send(mad_send_wr))
2845                         continue;
2846
2847                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2848
2849                 if (mad_send_wr->status == IB_WC_SUCCESS)
2850                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2851                 else
2852                         mad_send_wc.status = mad_send_wr->status;
2853                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2854                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2855                                                    &mad_send_wc);
2856
2857                 atomic_dec(&mad_agent_priv->refcount);
2858                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2859         }
2860         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2861 }
2862
2863 /*
2864  * Allocate receive MADs and post receive WRs for them
2865  */
2866 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2867                                     struct ib_mad_private *mad)
2868 {
2869         unsigned long flags;
2870         int post, ret;
2871         struct ib_mad_private *mad_priv;
2872         struct ib_sge sg_list;
2873         struct ib_recv_wr recv_wr, *bad_recv_wr;
2874         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2875
2876         /* Initialize common scatter list fields */
2877         sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2878
2879         /* Initialize common receive WR fields */
2880         recv_wr.next = NULL;
2881         recv_wr.sg_list = &sg_list;
2882         recv_wr.num_sge = 1;
2883
2884         do {
2885                 /* Allocate and map receive buffer */
2886                 if (mad) {
2887                         mad_priv = mad;
2888                         mad = NULL;
2889                 } else {
2890                         mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2891                                                      GFP_ATOMIC);
2892                         if (!mad_priv) {
2893                                 ret = -ENOMEM;
2894                                 break;
2895                         }
2896                 }
2897                 sg_list.length = mad_priv_dma_size(mad_priv);
2898                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2899                                                  &mad_priv->grh,
2900                                                  mad_priv_dma_size(mad_priv),
2901                                                  DMA_FROM_DEVICE);
2902                 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2903                                                   sg_list.addr))) {
2904                         ret = -ENOMEM;
2905                         break;
2906                 }
2907                 mad_priv->header.mapping = sg_list.addr;
2908                 mad_priv->header.mad_list.mad_queue = recv_queue;
2909                 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2910                 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2911
2912                 /* Post receive WR */
2913                 spin_lock_irqsave(&recv_queue->lock, flags);
2914                 post = (++recv_queue->count < recv_queue->max_active);
2915                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2916                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2917                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2918                 if (ret) {
2919                         spin_lock_irqsave(&recv_queue->lock, flags);
2920                         list_del(&mad_priv->header.mad_list.list);
2921                         recv_queue->count--;
2922                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2923                         ib_dma_unmap_single(qp_info->port_priv->device,
2924                                             mad_priv->header.mapping,
2925                                             mad_priv_dma_size(mad_priv),
2926                                             DMA_FROM_DEVICE);
2927                         kfree(mad_priv);
2928                         dev_err(&qp_info->port_priv->device->dev,
2929                                 "ib_post_recv failed: %d\n", ret);
2930                         break;
2931                 }
2932         } while (post);
2933
2934         return ret;
2935 }
2936
2937 /*
2938  * Return all the posted receive MADs
2939  */
2940 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2941 {
2942         struct ib_mad_private_header *mad_priv_hdr;
2943         struct ib_mad_private *recv;
2944         struct ib_mad_list_head *mad_list;
2945
2946         if (!qp_info->qp)
2947                 return;
2948
2949         while (!list_empty(&qp_info->recv_queue.list)) {
2950
2951                 mad_list = list_entry(qp_info->recv_queue.list.next,
2952                                       struct ib_mad_list_head, list);
2953                 mad_priv_hdr = container_of(mad_list,
2954                                             struct ib_mad_private_header,
2955                                             mad_list);
2956                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2957                                     header);
2958
2959                 /* Remove from posted receive MAD list */
2960                 list_del(&mad_list->list);
2961
2962                 ib_dma_unmap_single(qp_info->port_priv->device,
2963                                     recv->header.mapping,
2964                                     mad_priv_dma_size(recv),
2965                                     DMA_FROM_DEVICE);
2966                 kfree(recv);
2967         }
2968
2969         qp_info->recv_queue.count = 0;
2970 }
2971
2972 /*
2973  * Start the port
2974  */
2975 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2976 {
2977         int ret, i;
2978         struct ib_qp_attr *attr;
2979         struct ib_qp *qp;
2980         u16 pkey_index;
2981
2982         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2983         if (!attr)
2984                 return -ENOMEM;
2985
2986         ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2987                            IB_DEFAULT_PKEY_FULL, &pkey_index);
2988         if (ret)
2989                 pkey_index = 0;
2990
2991         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2992                 qp = port_priv->qp_info[i].qp;
2993                 if (!qp)
2994                         continue;
2995
2996                 /*
2997                  * PKey index for QP1 is irrelevant but
2998                  * one is needed for the Reset to Init transition
2999                  */
3000                 attr->qp_state = IB_QPS_INIT;
3001                 attr->pkey_index = pkey_index;
3002                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
3003                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
3004                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
3005                 if (ret) {
3006                         dev_err(&port_priv->device->dev,
3007                                 "Couldn't change QP%d state to INIT: %d\n",
3008                                 i, ret);
3009                         goto out;
3010                 }
3011
3012                 attr->qp_state = IB_QPS_RTR;
3013                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
3014                 if (ret) {
3015                         dev_err(&port_priv->device->dev,
3016                                 "Couldn't change QP%d state to RTR: %d\n",
3017                                 i, ret);
3018                         goto out;
3019                 }
3020
3021                 attr->qp_state = IB_QPS_RTS;
3022                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
3023                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
3024                 if (ret) {
3025                         dev_err(&port_priv->device->dev,
3026                                 "Couldn't change QP%d state to RTS: %d\n",
3027                                 i, ret);
3028                         goto out;
3029                 }
3030         }
3031
3032         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
3033         if (ret) {
3034                 dev_err(&port_priv->device->dev,
3035                         "Failed to request completion notification: %d\n",
3036                         ret);
3037                 goto out;
3038         }
3039
3040         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3041                 if (!port_priv->qp_info[i].qp)
3042                         continue;
3043
3044                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
3045                 if (ret) {
3046                         dev_err(&port_priv->device->dev,
3047                                 "Couldn't post receive WRs\n");
3048                         goto out;
3049                 }
3050         }
3051 out:
3052         kfree(attr);
3053         return ret;
3054 }
3055
3056 static void qp_event_handler(struct ib_event *event, void *qp_context)
3057 {
3058         struct ib_mad_qp_info   *qp_info = qp_context;
3059
3060         /* It's worse than that! He's dead, Jim! */
3061         dev_err(&qp_info->port_priv->device->dev,
3062                 "Fatal error (%d) on MAD QP (%d)\n",
3063                 event->event, qp_info->qp->qp_num);
3064 }
3065
3066 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
3067                            struct ib_mad_queue *mad_queue)
3068 {
3069         mad_queue->qp_info = qp_info;
3070         mad_queue->count = 0;
3071         spin_lock_init(&mad_queue->lock);
3072         INIT_LIST_HEAD(&mad_queue->list);
3073 }
3074
3075 static void init_mad_qp(struct ib_mad_port_private *port_priv,
3076                         struct ib_mad_qp_info *qp_info)
3077 {
3078         qp_info->port_priv = port_priv;
3079         init_mad_queue(qp_info, &qp_info->send_queue);
3080         init_mad_queue(qp_info, &qp_info->recv_queue);
3081         INIT_LIST_HEAD(&qp_info->overflow_list);
3082         spin_lock_init(&qp_info->snoop_lock);
3083         qp_info->snoop_table = NULL;
3084         qp_info->snoop_table_size = 0;
3085         atomic_set(&qp_info->snoop_count, 0);
3086 }
3087
3088 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
3089                          enum ib_qp_type qp_type)
3090 {
3091         struct ib_qp_init_attr  qp_init_attr;
3092         int ret;
3093
3094         memset(&qp_init_attr, 0, sizeof qp_init_attr);
3095         qp_init_attr.send_cq = qp_info->port_priv->cq;
3096         qp_init_attr.recv_cq = qp_info->port_priv->cq;
3097         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3098         qp_init_attr.cap.max_send_wr = mad_sendq_size;
3099         qp_init_attr.cap.max_recv_wr = mad_recvq_size;
3100         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
3101         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
3102         qp_init_attr.qp_type = qp_type;
3103         qp_init_attr.port_num = qp_info->port_priv->port_num;
3104         qp_init_attr.qp_context = qp_info;
3105         qp_init_attr.event_handler = qp_event_handler;
3106         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
3107         if (IS_ERR(qp_info->qp)) {
3108                 dev_err(&qp_info->port_priv->device->dev,
3109                         "Couldn't create ib_mad QP%d\n",
3110                         get_spl_qp_index(qp_type));
3111                 ret = PTR_ERR(qp_info->qp);
3112                 goto error;
3113         }
3114         /* Use minimum queue sizes unless the CQ is resized */
3115         qp_info->send_queue.max_active = mad_sendq_size;
3116         qp_info->recv_queue.max_active = mad_recvq_size;
3117         return 0;
3118
3119 error:
3120         return ret;
3121 }
3122
3123 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
3124 {
3125         if (!qp_info->qp)
3126                 return;
3127
3128         ib_destroy_qp(qp_info->qp);
3129         kfree(qp_info->snoop_table);
3130 }
3131
3132 /*
3133  * Open the port
3134  * Create the QP, PD, MR, and CQ if needed
3135  */
3136 static int ib_mad_port_open(struct ib_device *device,
3137                             int port_num)
3138 {
3139         int ret, cq_size;
3140         struct ib_mad_port_private *port_priv;
3141         unsigned long flags;
3142         char name[sizeof "ib_mad123"];
3143         int has_smi;
3144
3145         if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
3146                 return -EFAULT;
3147
3148         if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
3149                     rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
3150                 return -EFAULT;
3151
3152         /* Create new device info */
3153         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3154         if (!port_priv)
3155                 return -ENOMEM;
3156
3157         port_priv->device = device;
3158         port_priv->port_num = port_num;
3159         spin_lock_init(&port_priv->reg_lock);
3160         INIT_LIST_HEAD(&port_priv->agent_list);
3161         init_mad_qp(port_priv, &port_priv->qp_info[0]);
3162         init_mad_qp(port_priv, &port_priv->qp_info[1]);
3163
3164         cq_size = mad_sendq_size + mad_recvq_size;
3165         has_smi = rdma_cap_ib_smi(device, port_num);
3166         if (has_smi)
3167                 cq_size *= 2;
3168
3169         port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
3170                         IB_POLL_WORKQUEUE);
3171         if (IS_ERR(port_priv->cq)) {
3172                 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
3173                 ret = PTR_ERR(port_priv->cq);
3174                 goto error3;
3175         }
3176
3177         port_priv->pd = ib_alloc_pd(device, 0);
3178         if (IS_ERR(port_priv->pd)) {
3179                 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
3180                 ret = PTR_ERR(port_priv->pd);
3181                 goto error4;
3182         }
3183
3184         if (has_smi) {
3185                 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
3186                 if (ret)
3187                         goto error6;
3188         }
3189         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
3190         if (ret)
3191                 goto error7;
3192
3193         snprintf(name, sizeof name, "ib_mad%d", port_num);
3194         port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
3195         if (!port_priv->wq) {
3196                 ret = -ENOMEM;
3197                 goto error8;
3198         }
3199
3200         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3201         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
3202         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3203
3204         ret = ib_mad_port_start(port_priv);
3205         if (ret) {
3206                 dev_err(&device->dev, "Couldn't start port\n");
3207                 goto error9;
3208         }
3209
3210         return 0;
3211
3212 error9:
3213         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3214         list_del_init(&port_priv->port_list);
3215         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3216
3217         destroy_workqueue(port_priv->wq);
3218 error8:
3219         destroy_mad_qp(&port_priv->qp_info[1]);
3220 error7:
3221         destroy_mad_qp(&port_priv->qp_info[0]);
3222 error6:
3223         ib_dealloc_pd(port_priv->pd);
3224 error4:
3225         ib_free_cq(port_priv->cq);
3226         cleanup_recv_queue(&port_priv->qp_info[1]);
3227         cleanup_recv_queue(&port_priv->qp_info[0]);
3228 error3:
3229         kfree(port_priv);
3230
3231         return ret;
3232 }
3233
3234 /*
3235  * Close the port
3236  * If there are no classes using the port, free the port
3237  * resources (CQ, MR, PD, QP) and remove the port's info structure
3238  */
3239 static int ib_mad_port_close(struct ib_device *device, int port_num)
3240 {
3241         struct ib_mad_port_private *port_priv;
3242         unsigned long flags;
3243
3244         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3245         port_priv = __ib_get_mad_port(device, port_num);
3246         if (port_priv == NULL) {
3247                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3248                 dev_err(&device->dev, "Port %d not found\n", port_num);
3249                 return -ENODEV;
3250         }
3251         list_del_init(&port_priv->port_list);
3252         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3253
3254         destroy_workqueue(port_priv->wq);
3255         destroy_mad_qp(&port_priv->qp_info[1]);
3256         destroy_mad_qp(&port_priv->qp_info[0]);
3257         ib_dealloc_pd(port_priv->pd);
3258         ib_free_cq(port_priv->cq);
3259         cleanup_recv_queue(&port_priv->qp_info[1]);
3260         cleanup_recv_queue(&port_priv->qp_info[0]);
3261         /* XXX: Handle deallocation of MAD registration tables */
3262
3263         kfree(port_priv);
3264
3265         return 0;
3266 }
3267
3268 static void ib_mad_init_device(struct ib_device *device)
3269 {
3270         int start, i;
3271
3272         start = rdma_start_port(device);
3273
3274         for (i = start; i <= rdma_end_port(device); i++) {
3275                 if (!rdma_cap_ib_mad(device, i))
3276                         continue;
3277
3278                 if (ib_mad_port_open(device, i)) {
3279                         dev_err(&device->dev, "Couldn't open port %d\n", i);
3280                         goto error;
3281                 }
3282                 if (ib_agent_port_open(device, i)) {
3283                         dev_err(&device->dev,
3284                                 "Couldn't open port %d for agents\n", i);
3285                         goto error_agent;
3286                 }
3287         }
3288         return;
3289
3290 error_agent:
3291         if (ib_mad_port_close(device, i))
3292                 dev_err(&device->dev, "Couldn't close port %d\n", i);
3293
3294 error:
3295         while (--i >= start) {
3296                 if (!rdma_cap_ib_mad(device, i))
3297                         continue;
3298
3299                 if (ib_agent_port_close(device, i))
3300                         dev_err(&device->dev,
3301                                 "Couldn't close port %d for agents\n", i);
3302                 if (ib_mad_port_close(device, i))
3303                         dev_err(&device->dev, "Couldn't close port %d\n", i);
3304         }
3305 }
3306
3307 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3308 {
3309         int i;
3310
3311         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3312                 if (!rdma_cap_ib_mad(device, i))
3313                         continue;
3314
3315                 if (ib_agent_port_close(device, i))
3316                         dev_err(&device->dev,
3317                                 "Couldn't close port %d for agents\n", i);
3318                 if (ib_mad_port_close(device, i))
3319                         dev_err(&device->dev, "Couldn't close port %d\n", i);
3320         }
3321 }
3322
3323 static struct ib_client mad_client = {
3324         .name   = "mad",
3325         .add = ib_mad_init_device,
3326         .remove = ib_mad_remove_device
3327 };
3328
3329 int ib_mad_init(void)
3330 {
3331         mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3332         mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3333
3334         mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3335         mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3336
3337         INIT_LIST_HEAD(&ib_mad_port_list);
3338
3339         if (ib_register_client(&mad_client)) {
3340                 pr_err("Couldn't register ib_mad client\n");
3341                 return -EINVAL;
3342         }
3343
3344         return 0;
3345 }
3346
3347 void ib_mad_cleanup(void)
3348 {
3349         ib_unregister_client(&mad_client);
3350 }