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) 2014,2018 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 <linux/xarray.h>
  45 #include <rdma/ib_cache.h>
  46
  47 #include "mad_priv.h"
  48 #include "core_priv.h"
  49 #include "mad_rmpp.h"
  50 #include "smi.h"
  51 #include "opa_smi.h"
  52 #include "agent.h"
  53
  54 #define CREATE_TRACE_POINTS
  55 #include <trace/events/ib_mad.h>
  56
  57 #ifdef CONFIG_TRACEPOINTS
  58 static void create_mad_addr_info(struct ib_mad_send_wr_private *mad_send_wr,
  59                           struct ib_mad_qp_info *qp_info,
  60                           struct trace_event_raw_ib_mad_send_template *entry)
  61 {
  62         struct ib_ud_wr *wr = &mad_send_wr->send_wr;
  63         struct rdma_ah_attr attr = {};
  64
  65         rdma_query_ah(wr->ah, &attr);
  66
  67         /* These are common */
  68         entry->sl = attr.sl;
  69         entry->rqpn = wr->remote_qpn;
  70         entry->rqkey = wr->remote_qkey;
  71         entry->dlid = rdma_ah_get_dlid(&attr);
  72 }
  73 #endif
  74
  75 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
  76 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
  77
  78 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
  79 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
  80 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
  81 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
  82
  83 static DEFINE_XARRAY_ALLOC1(ib_mad_clients);
  84 static u32 ib_mad_client_next;
  85 static struct list_head ib_mad_port_list;
  86
  87 /* Port list lock */
  88 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
  89
  90 /* Forward declarations */
  91 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  92                          struct ib_mad_reg_req *mad_reg_req);
  93 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  94 static struct ib_mad_agent_private *find_mad_agent(
  95                                         struct ib_mad_port_private *port_priv,
  96                                         const struct ib_mad_hdr *mad);
  97 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  98                                     struct ib_mad_private *mad);
  99 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
 100 static void timeout_sends(struct work_struct *work);
 101 static void local_completions(struct work_struct *work);
 102 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
 103                               struct ib_mad_agent_private *agent_priv,
 104                               u8 mgmt_class);
 105 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
 106                            struct ib_mad_agent_private *agent_priv);
 107 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
 108                               struct ib_wc *wc);
 109 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
 110
 111 /*
 112  * Returns a ib_mad_port_private structure or NULL for a device/port
 113  * Assumes ib_mad_port_list_lock is being held
 114  */
 115 static inline struct ib_mad_port_private *
 116 __ib_get_mad_port(struct ib_device *device, u32 port_num)
 117 {
 118         struct ib_mad_port_private *entry;
 119
 120         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
 121                 if (entry->device == device && entry->port_num == port_num)
 122                         return entry;
 123         }
 124         return NULL;
 125 }
 126
 127 /*
 128  * Wrapper function to return a ib_mad_port_private structure or NULL
 129  * for a device/port
 130  */
 131 static inline struct ib_mad_port_private *
 132 ib_get_mad_port(struct ib_device *device, u32 port_num)
 133 {
 134         struct ib_mad_port_private *entry;
 135         unsigned long flags;
 136
 137         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 138         entry = __ib_get_mad_port(device, port_num);
 139         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 140
 141         return entry;
 142 }
 143
 144 static inline u8 convert_mgmt_class(u8 mgmt_class)
 145 {
 146         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 147         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 148                 0 : mgmt_class;
 149 }
 150
 151 static int get_spl_qp_index(enum ib_qp_type qp_type)
 152 {
 153         switch (qp_type) {
 154         case IB_QPT_SMI:
 155                 return 0;
 156         case IB_QPT_GSI:
 157                 return 1;
 158         default:
 159                 return -1;
 160         }
 161 }
 162
 163 static int vendor_class_index(u8 mgmt_class)
 164 {
 165         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 166 }
 167
 168 static int is_vendor_class(u8 mgmt_class)
 169 {
 170         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 171             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 172                 return 0;
 173         return 1;
 174 }
 175
 176 static int is_vendor_oui(char *oui)
 177 {
 178         if (oui[0] || oui[1] || oui[2])
 179                 return 1;
 180         return 0;
 181 }
 182
 183 static int is_vendor_method_in_use(
 184                 struct ib_mad_mgmt_vendor_class *vendor_class,
 185                 struct ib_mad_reg_req *mad_reg_req)
 186 {
 187         struct ib_mad_mgmt_method_table *method;
 188         int i;
 189
 190         for (i = 0; i < MAX_MGMT_OUI; i++) {
 191                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 192                         method = vendor_class->method_table[i];
 193                         if (method) {
 194                                 if (method_in_use(&method, mad_reg_req))
 195                                         return 1;
 196                                 else
 197                                         break;
 198                         }
 199                 }
 200         }
 201         return 0;
 202 }
 203
 204 int ib_response_mad(const struct ib_mad_hdr *hdr)
 205 {
 206         return ((hdr->method & IB_MGMT_METHOD_RESP) ||
 207                 (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 208                 ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
 209                  (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
 210 }
 211 EXPORT_SYMBOL(ib_response_mad);
 212
 213 /*
 214  * ib_register_mad_agent - Register to send/receive MADs
 215  *
 216  * Context: Process context.
 217  */
 218 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 219                                            u32 port_num,
 220                                            enum ib_qp_type qp_type,
 221                                            struct ib_mad_reg_req *mad_reg_req,
 222                                            u8 rmpp_version,
 223                                            ib_mad_send_handler send_handler,
 224                                            ib_mad_recv_handler recv_handler,
 225                                            void *context,
 226                                            u32 registration_flags)
 227 {
 228         struct ib_mad_port_private *port_priv;
 229         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 230         struct ib_mad_agent_private *mad_agent_priv;
 231         struct ib_mad_reg_req *reg_req = NULL;
 232         struct ib_mad_mgmt_class_table *class;
 233         struct ib_mad_mgmt_vendor_class_table *vendor;
 234         struct ib_mad_mgmt_vendor_class *vendor_class;
 235         struct ib_mad_mgmt_method_table *method;
 236         int ret2, qpn;
 237         u8 mgmt_class, vclass;
 238
 239         if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
 240             (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
 241                 return ERR_PTR(-EPROTONOSUPPORT);
 242
 243         /* Validate parameters */
 244         qpn = get_spl_qp_index(qp_type);
 245         if (qpn == -1) {
 246                 dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
 247                                     __func__, qp_type);
 248                 goto error1;
 249         }
 250
 251         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
 252                 dev_dbg_ratelimited(&device->dev,
 253                                     "%s: invalid RMPP Version %u\n",
 254                                     __func__, rmpp_version);
 255                 goto error1;
 256         }
 257
 258         /* Validate MAD registration request if supplied */
 259         if (mad_reg_req) {
 260                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
 261                         dev_dbg_ratelimited(&device->dev,
 262                                             "%s: invalid Class Version %u\n",
 263                                             __func__,
 264                                             mad_reg_req->mgmt_class_version);
 265                         goto error1;
 266                 }
 267                 if (!recv_handler) {
 268                         dev_dbg_ratelimited(&device->dev,
 269                                             "%s: no recv_handler\n", __func__);
 270                         goto error1;
 271                 }
 272                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 273                         /*
 274                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 275                          * one in this range currently allowed
 276                          */
 277                         if (mad_reg_req->mgmt_class !=
 278                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 279                                 dev_dbg_ratelimited(&device->dev,
 280                                         "%s: Invalid Mgmt Class 0x%x\n",
 281                                         __func__, mad_reg_req->mgmt_class);
 282                                 goto error1;
 283                         }
 284                 } else if (mad_reg_req->mgmt_class == 0) {
 285                         /*
 286                          * Class 0 is reserved in IBA and is used for
 287                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 288                          */
 289                         dev_dbg_ratelimited(&device->dev,
 290                                             "%s: Invalid Mgmt Class 0\n",
 291                                             __func__);
 292                         goto error1;
 293                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 294                         /*
 295                          * If class is in "new" vendor range,
 296                          * ensure supplied OUI is not zero
 297                          */
 298                         if (!is_vendor_oui(mad_reg_req->oui)) {
 299                                 dev_dbg_ratelimited(&device->dev,
 300                                         "%s: No OUI specified for class 0x%x\n",
 301                                         __func__,
 302                                         mad_reg_req->mgmt_class);
 303                                 goto error1;
 304                         }
 305                 }
 306                 /* Make sure class supplied is consistent with RMPP */
 307                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 308                         if (rmpp_version) {
 309                                 dev_dbg_ratelimited(&device->dev,
 310                                         "%s: RMPP version for non-RMPP class 0x%x\n",
 311                                         __func__, mad_reg_req->mgmt_class);
 312                                 goto error1;
 313                         }
 314                 }
 315
 316                 /* Make sure class supplied is consistent with QP type */
 317                 if (qp_type == IB_QPT_SMI) {
 318                         if ((mad_reg_req->mgmt_class !=
 319                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 320                             (mad_reg_req->mgmt_class !=
 321                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
 322                                 dev_dbg_ratelimited(&device->dev,
 323                                         "%s: Invalid SM QP type: class 0x%x\n",
 324                                         __func__, mad_reg_req->mgmt_class);
 325                                 goto error1;
 326                         }
 327                 } else {
 328                         if ((mad_reg_req->mgmt_class ==
 329                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 330                             (mad_reg_req->mgmt_class ==
 331                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
 332                                 dev_dbg_ratelimited(&device->dev,
 333                                         "%s: Invalid GS QP type: class 0x%x\n",
 334                                         __func__, mad_reg_req->mgmt_class);
 335                                 goto error1;
 336                         }
 337                 }
 338         } else {
 339                 /* No registration request supplied */
 340                 if (!send_handler)
 341                         goto error1;
 342                 if (registration_flags & IB_MAD_USER_RMPP)
 343                         goto error1;
 344         }
 345
 346         /* Validate device and port */
 347         port_priv = ib_get_mad_port(device, port_num);
 348         if (!port_priv) {
 349                 dev_dbg_ratelimited(&device->dev, "%s: Invalid port %u\n",
 350                                     __func__, port_num);
 351                 ret = ERR_PTR(-ENODEV);
 352                 goto error1;
 353         }
 354
 355         /* Verify the QP requested is supported. For example, Ethernet devices
 356          * will not have QP0.
 357          */
 358         if (!port_priv->qp_info[qpn].qp) {
 359                 dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
 360                                     __func__, qpn);
 361                 ret = ERR_PTR(-EPROTONOSUPPORT);
 362                 goto error1;
 363         }
 364
 365         /* Allocate structures */
 366         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 367         if (!mad_agent_priv) {
 368                 ret = ERR_PTR(-ENOMEM);
 369                 goto error1;
 370         }
 371
 372         if (mad_reg_req) {
 373                 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
 374                 if (!reg_req) {
 375                         ret = ERR_PTR(-ENOMEM);
 376                         goto error3;
 377                 }
 378         }
 379
 380         /* Now, fill in the various structures */
 381         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 382         mad_agent_priv->reg_req = reg_req;
 383         mad_agent_priv->agent.rmpp_version = rmpp_version;
 384         mad_agent_priv->agent.device = device;
 385         mad_agent_priv->agent.recv_handler = recv_handler;
 386         mad_agent_priv->agent.send_handler = send_handler;
 387         mad_agent_priv->agent.context = context;
 388         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 389         mad_agent_priv->agent.port_num = port_num;
 390         mad_agent_priv->agent.flags = registration_flags;
 391         spin_lock_init(&mad_agent_priv->lock);
 392         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 393         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 394         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 395         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 396         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 397         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 398         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 399         refcount_set(&mad_agent_priv->refcount, 1);
 400         init_completion(&mad_agent_priv->comp);
 401
 402         ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
 403         if (ret2) {
 404                 ret = ERR_PTR(ret2);
 405                 goto error4;
 406         }
 407
 408         /*
 409          * The mlx4 driver uses the top byte to distinguish which virtual
 410          * function generated the MAD, so we must avoid using it.
 411          */
 412         ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid,
 413                         mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1),
 414                         &ib_mad_client_next, GFP_KERNEL);
 415         if (ret2 < 0) {
 416                 ret = ERR_PTR(ret2);
 417                 goto error5;
 418         }
 419
 420         /*
 421          * Make sure MAD registration (if supplied)
 422          * is non overlapping with any existing ones
 423          */
 424         spin_lock_irq(&port_priv->reg_lock);
 425         if (mad_reg_req) {
 426                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 427                 if (!is_vendor_class(mgmt_class)) {
 428                         class = port_priv->version[mad_reg_req->
 429                                                    mgmt_class_version].class;
 430                         if (class) {
 431                                 method = class->method_table[mgmt_class];
 432                                 if (method) {
 433                                         if (method_in_use(&method,
 434                                                            mad_reg_req))
 435                                                 goto error6;
 436                                 }
 437                         }
 438                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 439                                                   mgmt_class);
 440                 } else {
 441                         /* "New" vendor class range */
 442                         vendor = port_priv->version[mad_reg_req->
 443                                                     mgmt_class_version].vendor;
 444                         if (vendor) {
 445                                 vclass = vendor_class_index(mgmt_class);
 446                                 vendor_class = vendor->vendor_class[vclass];
 447                                 if (vendor_class) {
 448                                         if (is_vendor_method_in_use(
 449                                                         vendor_class,
 450                                                         mad_reg_req))
 451                                                 goto error6;
 452                                 }
 453                         }
 454                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 455                 }
 456                 if (ret2) {
 457                         ret = ERR_PTR(ret2);
 458                         goto error6;
 459                 }
 460         }
 461         spin_unlock_irq(&port_priv->reg_lock);
 462
 463         trace_ib_mad_create_agent(mad_agent_priv);
 464         return &mad_agent_priv->agent;
 465 error6:
 466         spin_unlock_irq(&port_priv->reg_lock);
 467         xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
 468 error5:
 469         ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
 470 error4:
 471         kfree(reg_req);
 472 error3:
 473         kfree(mad_agent_priv);
 474 error1:
 475         return ret;
 476 }
 477 EXPORT_SYMBOL(ib_register_mad_agent);
 478
 479 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 480 {
 481         if (refcount_dec_and_test(&mad_agent_priv->refcount))
 482                 complete(&mad_agent_priv->comp);
 483 }
 484
 485 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 486 {
 487         struct ib_mad_port_private *port_priv;
 488
 489         /* Note that we could still be handling received MADs */
 490         trace_ib_mad_unregister_agent(mad_agent_priv);
 491
 492         /*
 493          * Canceling all sends results in dropping received response
 494          * MADs, preventing us from queuing additional work
 495          */
 496         cancel_mads(mad_agent_priv);
 497         port_priv = mad_agent_priv->qp_info->port_priv;
 498         cancel_delayed_work(&mad_agent_priv->timed_work);
 499
 500         spin_lock_irq(&port_priv->reg_lock);
 501         remove_mad_reg_req(mad_agent_priv);
 502         spin_unlock_irq(&port_priv->reg_lock);
 503         xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
 504
 505         flush_workqueue(port_priv->wq);
 506
 507         deref_mad_agent(mad_agent_priv);
 508         wait_for_completion(&mad_agent_priv->comp);
 509         ib_cancel_rmpp_recvs(mad_agent_priv);
 510
 511         ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
 512
 513         kfree(mad_agent_priv->reg_req);
 514         kfree_rcu(mad_agent_priv, rcu);
 515 }
 516
 517 /*
 518  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 519  *
 520  * Context: Process context.
 521  */
 522 void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 523 {
 524         struct ib_mad_agent_private *mad_agent_priv;
 525
 526         mad_agent_priv = container_of(mad_agent,
 527                                       struct ib_mad_agent_private,
 528                                       agent);
 529         unregister_mad_agent(mad_agent_priv);
 530 }
 531 EXPORT_SYMBOL(ib_unregister_mad_agent);
 532
 533 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 534 {
 535         struct ib_mad_queue *mad_queue;
 536         unsigned long flags;
 537
 538         mad_queue = mad_list->mad_queue;
 539         spin_lock_irqsave(&mad_queue->lock, flags);
 540         list_del(&mad_list->list);
 541         mad_queue->count--;
 542         spin_unlock_irqrestore(&mad_queue->lock, flags);
 543 }
 544
 545 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
 546                 u16 pkey_index, u32 port_num, struct ib_wc *wc)
 547 {
 548         memset(wc, 0, sizeof *wc);
 549         wc->wr_cqe = cqe;
 550         wc->status = IB_WC_SUCCESS;
 551         wc->opcode = IB_WC_RECV;
 552         wc->pkey_index = pkey_index;
 553         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 554         wc->src_qp = IB_QP0;
 555         wc->qp = qp;
 556         wc->slid = slid;
 557         wc->sl = 0;
 558         wc->dlid_path_bits = 0;
 559         wc->port_num = port_num;
 560 }
 561
 562 static size_t mad_priv_size(const struct ib_mad_private *mp)
 563 {
 564         return sizeof(struct ib_mad_private) + mp->mad_size;
 565 }
 566
 567 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
 568 {
 569         size_t size = sizeof(struct ib_mad_private) + mad_size;
 570         struct ib_mad_private *ret = kzalloc(size, flags);
 571
 572         if (ret)
 573                 ret->mad_size = mad_size;
 574
 575         return ret;
 576 }
 577
 578 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
 579 {
 580         return rdma_max_mad_size(port_priv->device, port_priv->port_num);
 581 }
 582
 583 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
 584 {
 585         return sizeof(struct ib_grh) + mp->mad_size;
 586 }
 587
 588 /*
 589  * Return 0 if SMP is to be sent
 590  * Return 1 if SMP was consumed locally (whether or not solicited)
 591  * Return < 0 if error
 592  */
 593 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 594                                   struct ib_mad_send_wr_private *mad_send_wr)
 595 {
 596         int ret = 0;
 597         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 598         struct opa_smp *opa_smp = (struct opa_smp *)smp;
 599         unsigned long flags;
 600         struct ib_mad_local_private *local;
 601         struct ib_mad_private *mad_priv;
 602         struct ib_mad_port_private *port_priv;
 603         struct ib_mad_agent_private *recv_mad_agent = NULL;
 604         struct ib_device *device = mad_agent_priv->agent.device;
 605         u32 port_num;
 606         struct ib_wc mad_wc;
 607         struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
 608         size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
 609         u16 out_mad_pkey_index = 0;
 610         u16 drslid;
 611         bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
 612                                     mad_agent_priv->qp_info->port_priv->port_num);
 613
 614         if (rdma_cap_ib_switch(device) &&
 615             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 616                 port_num = send_wr->port_num;
 617         else
 618                 port_num = mad_agent_priv->agent.port_num;
 619
 620         /*
 621          * Directed route handling starts if the initial LID routed part of
 622          * a request or the ending LID routed part of a response is empty.
 623          * If we are at the start of the LID routed part, don't update the
 624          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 625          */
 626         if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
 627                 u32 opa_drslid;
 628
 629                 trace_ib_mad_handle_out_opa_smi(opa_smp);
 630
 631                 if ((opa_get_smp_direction(opa_smp)
 632                      ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
 633                      OPA_LID_PERMISSIVE &&
 634                      opa_smi_handle_dr_smp_send(opa_smp,
 635                                                 rdma_cap_ib_switch(device),
 636                                                 port_num) == IB_SMI_DISCARD) {
 637                         ret = -EINVAL;
 638                         dev_err(&device->dev, "OPA Invalid directed route\n");
 639                         goto out;
 640                 }
 641                 opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
 642                 if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
 643                     opa_drslid & 0xffff0000) {
 644                         ret = -EINVAL;
 645                         dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
 646                                opa_drslid);
 647                         goto out;
 648                 }
 649                 drslid = (u16)(opa_drslid & 0x0000ffff);
 650
 651                 /* Check to post send on QP or process locally */
 652                 if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
 653                     opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
 654                         goto out;
 655         } else {
 656                 trace_ib_mad_handle_out_ib_smi(smp);
 657
 658                 if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 659                      IB_LID_PERMISSIVE &&
 660                      smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
 661                      IB_SMI_DISCARD) {
 662                         ret = -EINVAL;
 663                         dev_err(&device->dev, "Invalid directed route\n");
 664                         goto out;
 665                 }
 666                 drslid = be16_to_cpu(smp->dr_slid);
 667
 668                 /* Check to post send on QP or process locally */
 669                 if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 670                     smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 671                         goto out;
 672         }
 673
 674         local = kmalloc(sizeof *local, GFP_ATOMIC);
 675         if (!local) {
 676                 ret = -ENOMEM;
 677                 goto out;
 678         }
 679         local->mad_priv = NULL;
 680         local->recv_mad_agent = NULL;
 681         mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
 682         if (!mad_priv) {
 683                 ret = -ENOMEM;
 684                 kfree(local);
 685                 goto out;
 686         }
 687
 688         build_smp_wc(mad_agent_priv->agent.qp,
 689                      send_wr->wr.wr_cqe, drslid,
 690                      send_wr->pkey_index,
 691                      send_wr->port_num, &mad_wc);
 692
 693         if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
 694                 mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
 695                                         + mad_send_wr->send_buf.data_len
 696                                         + sizeof(struct ib_grh);
 697         }
 698
 699         /* No GRH for DR SMP */
 700         ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL,
 701                                       (const struct ib_mad *)smp,
 702                                       (struct ib_mad *)mad_priv->mad, &mad_size,
 703                                       &out_mad_pkey_index);
 704         switch (ret) {
 705         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 706                 if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
 707                     mad_agent_priv->agent.recv_handler) {
 708                         local->mad_priv = mad_priv;
 709                         local->recv_mad_agent = mad_agent_priv;
 710                         /*
 711                          * Reference MAD agent until receive
 712                          * side of local completion handled
 713                          */
 714                         refcount_inc(&mad_agent_priv->refcount);
 715                 } else
 716                         kfree(mad_priv);
 717                 break;
 718         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 719                 kfree(mad_priv);
 720                 break;
 721         case IB_MAD_RESULT_SUCCESS:
 722                 /* Treat like an incoming receive MAD */
 723                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 724                                             mad_agent_priv->agent.port_num);
 725                 if (port_priv) {
 726                         memcpy(mad_priv->mad, smp, mad_priv->mad_size);
 727                         recv_mad_agent = find_mad_agent(port_priv,
 728                                                         (const struct ib_mad_hdr *)mad_priv->mad);
 729                 }
 730                 if (!port_priv || !recv_mad_agent) {
 731                         /*
 732                          * No receiving agent so drop packet and
 733                          * generate send completion.
 734                          */
 735                         kfree(mad_priv);
 736                         break;
 737                 }
 738                 local->mad_priv = mad_priv;
 739                 local->recv_mad_agent = recv_mad_agent;
 740                 break;
 741         default:
 742                 kfree(mad_priv);
 743                 kfree(local);
 744                 ret = -EINVAL;
 745                 goto out;
 746         }
 747
 748         local->mad_send_wr = mad_send_wr;
 749         if (opa) {
 750                 local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
 751                 local->return_wc_byte_len = mad_size;
 752         }
 753         /* Reference MAD agent until send side of local completion handled */
 754         refcount_inc(&mad_agent_priv->refcount);
 755         /* Queue local completion to local list */
 756         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 757         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 758         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 759         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 760                    &mad_agent_priv->local_work);
 761         ret = 1;
 762 out:
 763         return ret;
 764 }
 765
 766 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
 767 {
 768         int seg_size, pad;
 769
 770         seg_size = mad_size - hdr_len;
 771         if (data_len && seg_size) {
 772                 pad = seg_size - data_len % seg_size;
 773                 return pad == seg_size ? 0 : pad;
 774         } else
 775                 return seg_size;
 776 }
 777
 778 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 779 {
 780         struct ib_rmpp_segment *s, *t;
 781
 782         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 783                 list_del(&s->list);
 784                 kfree(s);
 785         }
 786 }
 787
 788 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 789                                 size_t mad_size, gfp_t gfp_mask)
 790 {
 791         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 792         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 793         struct ib_rmpp_segment *seg = NULL;
 794         int left, seg_size, pad;
 795
 796         send_buf->seg_size = mad_size - send_buf->hdr_len;
 797         send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
 798         seg_size = send_buf->seg_size;
 799         pad = send_wr->pad;
 800
 801         /* Allocate data segments. */
 802         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 803                 seg = kmalloc(sizeof(*seg) + seg_size, gfp_mask);
 804                 if (!seg) {
 805                         free_send_rmpp_list(send_wr);
 806                         return -ENOMEM;
 807                 }
 808                 seg->num = ++send_buf->seg_count;
 809                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 810         }
 811
 812         /* Zero any padding */
 813         if (pad)
 814                 memset(seg->data + seg_size - pad, 0, pad);
 815
 816         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 817                                           agent.rmpp_version;
 818         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 819         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 820
 821         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 822                                         struct ib_rmpp_segment, list);
 823         send_wr->last_ack_seg = send_wr->cur_seg;
 824         return 0;
 825 }
 826
 827 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
 828 {
 829         return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
 830 }
 831 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
 832
 833 struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
 834                                            u32 remote_qpn, u16 pkey_index,
 835                                            int rmpp_active, int hdr_len,
 836                                            int data_len, gfp_t gfp_mask,
 837                                            u8 base_version)
 838 {
 839         struct ib_mad_agent_private *mad_agent_priv;
 840         struct ib_mad_send_wr_private *mad_send_wr;
 841         int pad, message_size, ret, size;
 842         void *buf;
 843         size_t mad_size;
 844         bool opa;
 845
 846         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 847                                       agent);
 848
 849         opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
 850
 851         if (opa && base_version == OPA_MGMT_BASE_VERSION)
 852                 mad_size = sizeof(struct opa_mad);
 853         else
 854                 mad_size = sizeof(struct ib_mad);
 855
 856         pad = get_pad_size(hdr_len, data_len, mad_size);
 857         message_size = hdr_len + data_len + pad;
 858
 859         if (ib_mad_kernel_rmpp_agent(mad_agent)) {
 860                 if (!rmpp_active && message_size > mad_size)
 861                         return ERR_PTR(-EINVAL);
 862         } else
 863                 if (rmpp_active || message_size > mad_size)
 864                         return ERR_PTR(-EINVAL);
 865
 866         size = rmpp_active ? hdr_len : mad_size;
 867         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 868         if (!buf)
 869                 return ERR_PTR(-ENOMEM);
 870
 871         mad_send_wr = buf + size;
 872         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 873         mad_send_wr->send_buf.mad = buf;
 874         mad_send_wr->send_buf.hdr_len = hdr_len;
 875         mad_send_wr->send_buf.data_len = data_len;
 876         mad_send_wr->pad = pad;
 877
 878         mad_send_wr->mad_agent_priv = mad_agent_priv;
 879         mad_send_wr->sg_list[0].length = hdr_len;
 880         mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
 881
 882         /* OPA MADs don't have to be the full 2048 bytes */
 883         if (opa && base_version == OPA_MGMT_BASE_VERSION &&
 884             data_len < mad_size - hdr_len)
 885                 mad_send_wr->sg_list[1].length = data_len;
 886         else
 887                 mad_send_wr->sg_list[1].length = mad_size - hdr_len;
 888
 889         mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
 890
 891         mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
 892
 893         mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
 894         mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
 895         mad_send_wr->send_wr.wr.num_sge = 2;
 896         mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
 897         mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
 898         mad_send_wr->send_wr.remote_qpn = remote_qpn;
 899         mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
 900         mad_send_wr->send_wr.pkey_index = pkey_index;
 901
 902         if (rmpp_active) {
 903                 ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
 904                 if (ret) {
 905                         kfree(buf);
 906                         return ERR_PTR(ret);
 907                 }
 908         }
 909
 910         mad_send_wr->send_buf.mad_agent = mad_agent;
 911         refcount_inc(&mad_agent_priv->refcount);
 912         return &mad_send_wr->send_buf;
 913 }
 914 EXPORT_SYMBOL(ib_create_send_mad);
 915
 916 int ib_get_mad_data_offset(u8 mgmt_class)
 917 {
 918         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 919                 return IB_MGMT_SA_HDR;
 920         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 921                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 922                  (mgmt_class == IB_MGMT_CLASS_BIS))
 923                 return IB_MGMT_DEVICE_HDR;
 924         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 925                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 926                 return IB_MGMT_VENDOR_HDR;
 927         else
 928                 return IB_MGMT_MAD_HDR;
 929 }
 930 EXPORT_SYMBOL(ib_get_mad_data_offset);
 931
 932 int ib_is_mad_class_rmpp(u8 mgmt_class)
 933 {
 934         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 935             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 936             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 937             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 938             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 939              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 940                 return 1;
 941         return 0;
 942 }
 943 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 944
 945 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 946 {
 947         struct ib_mad_send_wr_private *mad_send_wr;
 948         struct list_head *list;
 949
 950         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 951                                    send_buf);
 952         list = &mad_send_wr->cur_seg->list;
 953
 954         if (mad_send_wr->cur_seg->num < seg_num) {
 955                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 956                         if (mad_send_wr->cur_seg->num == seg_num)
 957                                 break;
 958         } else if (mad_send_wr->cur_seg->num > seg_num) {
 959                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 960                         if (mad_send_wr->cur_seg->num == seg_num)
 961                                 break;
 962         }
 963         return mad_send_wr->cur_seg->data;
 964 }
 965 EXPORT_SYMBOL(ib_get_rmpp_segment);
 966
 967 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 968 {
 969         if (mad_send_wr->send_buf.seg_count)
 970                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 971                                            mad_send_wr->seg_num);
 972         else
 973                 return mad_send_wr->send_buf.mad +
 974                        mad_send_wr->send_buf.hdr_len;
 975 }
 976
 977 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 978 {
 979         struct ib_mad_agent_private *mad_agent_priv;
 980         struct ib_mad_send_wr_private *mad_send_wr;
 981
 982         mad_agent_priv = container_of(send_buf->mad_agent,
 983                                       struct ib_mad_agent_private, agent);
 984         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 985                                    send_buf);
 986
 987         free_send_rmpp_list(mad_send_wr);
 988         kfree(send_buf->mad);
 989         deref_mad_agent(mad_agent_priv);
 990 }
 991 EXPORT_SYMBOL(ib_free_send_mad);
 992
 993 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 994 {
 995         struct ib_mad_qp_info *qp_info;
 996         struct list_head *list;
 997         struct ib_mad_agent *mad_agent;
 998         struct ib_sge *sge;
 999         unsigned long flags;
1000         int ret;
1001
1002         /* Set WR ID to find mad_send_wr upon completion */
1003         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1004         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1005         mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
1006         mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
1007
1008         mad_agent = mad_send_wr->send_buf.mad_agent;
1009         sge = mad_send_wr->sg_list;
1010         sge[0].addr = ib_dma_map_single(mad_agent->device,
1011                                         mad_send_wr->send_buf.mad,
1012                                         sge[0].length,
1013                                         DMA_TO_DEVICE);
1014         if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
1015                 return -ENOMEM;
1016
1017         mad_send_wr->header_mapping = sge[0].addr;
1018
1019         sge[1].addr = ib_dma_map_single(mad_agent->device,
1020                                         ib_get_payload(mad_send_wr),
1021                                         sge[1].length,
1022                                         DMA_TO_DEVICE);
1023         if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
1024                 ib_dma_unmap_single(mad_agent->device,
1025                                     mad_send_wr->header_mapping,
1026                                     sge[0].length, DMA_TO_DEVICE);
1027                 return -ENOMEM;
1028         }
1029         mad_send_wr->payload_mapping = sge[1].addr;
1030
1031         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1032         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1033                 trace_ib_mad_ib_send_mad(mad_send_wr, qp_info);
1034                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1035                                    NULL);
1036                 list = &qp_info->send_queue.list;
1037         } else {
1038                 ret = 0;
1039                 list = &qp_info->overflow_list;
1040         }
1041
1042         if (!ret) {
1043                 qp_info->send_queue.count++;
1044                 list_add_tail(&mad_send_wr->mad_list.list, list);
1045         }
1046         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1047         if (ret) {
1048                 ib_dma_unmap_single(mad_agent->device,
1049                                     mad_send_wr->header_mapping,
1050                                     sge[0].length, DMA_TO_DEVICE);
1051                 ib_dma_unmap_single(mad_agent->device,
1052                                     mad_send_wr->payload_mapping,
1053                                     sge[1].length, DMA_TO_DEVICE);
1054         }
1055         return ret;
1056 }
1057
1058 /*
1059  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1060  *  with the registered client
1061  */
1062 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1063                      struct ib_mad_send_buf **bad_send_buf)
1064 {
1065         struct ib_mad_agent_private *mad_agent_priv;
1066         struct ib_mad_send_buf *next_send_buf;
1067         struct ib_mad_send_wr_private *mad_send_wr;
1068         unsigned long flags;
1069         int ret = -EINVAL;
1070
1071         /* Walk list of send WRs and post each on send list */
1072         for (; send_buf; send_buf = next_send_buf) {
1073                 mad_send_wr = container_of(send_buf,
1074                                            struct ib_mad_send_wr_private,
1075                                            send_buf);
1076                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1077
1078                 ret = ib_mad_enforce_security(mad_agent_priv,
1079                                               mad_send_wr->send_wr.pkey_index);
1080                 if (ret)
1081                         goto error;
1082
1083                 if (!send_buf->mad_agent->send_handler ||
1084                     (send_buf->timeout_ms &&
1085                      !send_buf->mad_agent->recv_handler)) {
1086                         ret = -EINVAL;
1087                         goto error;
1088                 }
1089
1090                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1091                         if (mad_agent_priv->agent.rmpp_version) {
1092                                 ret = -EINVAL;
1093                                 goto error;
1094                         }
1095                 }
1096
1097                 /*
1098                  * Save pointer to next work request to post in case the
1099                  * current one completes, and the user modifies the work
1100                  * request associated with the completion
1101                  */
1102                 next_send_buf = send_buf->next;
1103                 mad_send_wr->send_wr.ah = send_buf->ah;
1104
1105                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1106                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1107                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1108                                                      mad_send_wr);
1109                         if (ret < 0)            /* error */
1110                                 goto error;
1111                         else if (ret == 1)      /* locally consumed */
1112                                 continue;
1113                 }
1114
1115                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1116                 /* Timeout will be updated after send completes */
1117                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1118                 mad_send_wr->max_retries = send_buf->retries;
1119                 mad_send_wr->retries_left = send_buf->retries;
1120                 send_buf->retries = 0;
1121                 /* Reference for work request to QP + response */
1122                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1123                 mad_send_wr->status = IB_WC_SUCCESS;
1124
1125                 /* Reference MAD agent until send completes */
1126                 refcount_inc(&mad_agent_priv->refcount);
1127                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1128                 list_add_tail(&mad_send_wr->agent_list,
1129                               &mad_agent_priv->send_list);
1130                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1131
1132                 if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1133                         ret = ib_send_rmpp_mad(mad_send_wr);
1134                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1135                                 ret = ib_send_mad(mad_send_wr);
1136                 } else
1137                         ret = ib_send_mad(mad_send_wr);
1138                 if (ret < 0) {
1139                         /* Fail send request */
1140                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1141                         list_del(&mad_send_wr->agent_list);
1142                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1143                         deref_mad_agent(mad_agent_priv);
1144                         goto error;
1145                 }
1146         }
1147         return 0;
1148 error:
1149         if (bad_send_buf)
1150                 *bad_send_buf = send_buf;
1151         return ret;
1152 }
1153 EXPORT_SYMBOL(ib_post_send_mad);
1154
1155 /*
1156  * ib_free_recv_mad - Returns data buffers used to receive
1157  *  a MAD to the access layer
1158  */
1159 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1160 {
1161         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1162         struct ib_mad_private_header *mad_priv_hdr;
1163         struct ib_mad_private *priv;
1164         struct list_head free_list;
1165
1166         INIT_LIST_HEAD(&free_list);
1167         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1168
1169         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1170                                         &free_list, list) {
1171                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1172                                            recv_buf);
1173                 mad_priv_hdr = container_of(mad_recv_wc,
1174                                             struct ib_mad_private_header,
1175                                             recv_wc);
1176                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1177                                     header);
1178                 kfree(priv);
1179         }
1180 }
1181 EXPORT_SYMBOL(ib_free_recv_mad);
1182
1183 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1184                          struct ib_mad_reg_req *mad_reg_req)
1185 {
1186         int i;
1187
1188         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1189                 if ((*method)->agent[i]) {
1190                         pr_err("Method %d already in use\n", i);
1191                         return -EINVAL;
1192                 }
1193         }
1194         return 0;
1195 }
1196
1197 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1198 {
1199         /* Allocate management method table */
1200         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1201         return (*method) ? 0 : (-ENOMEM);
1202 }
1203
1204 /*
1205  * Check to see if there are any methods still in use
1206  */
1207 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1208 {
1209         int i;
1210
1211         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1212                 if (method->agent[i])
1213                         return 1;
1214         return 0;
1215 }
1216
1217 /*
1218  * Check to see if there are any method tables for this class still in use
1219  */
1220 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1221 {
1222         int i;
1223
1224         for (i = 0; i < MAX_MGMT_CLASS; i++)
1225                 if (class->method_table[i])
1226                         return 1;
1227         return 0;
1228 }
1229
1230 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1231 {
1232         int i;
1233
1234         for (i = 0; i < MAX_MGMT_OUI; i++)
1235                 if (vendor_class->method_table[i])
1236                         return 1;
1237         return 0;
1238 }
1239
1240 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1241                            const char *oui)
1242 {
1243         int i;
1244
1245         for (i = 0; i < MAX_MGMT_OUI; i++)
1246                 /* Is there matching OUI for this vendor class ? */
1247                 if (!memcmp(vendor_class->oui[i], oui, 3))
1248                         return i;
1249
1250         return -1;
1251 }
1252
1253 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1254 {
1255         int i;
1256
1257         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1258                 if (vendor->vendor_class[i])
1259                         return 1;
1260
1261         return 0;
1262 }
1263
1264 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1265                                      struct ib_mad_agent_private *agent)
1266 {
1267         int i;
1268
1269         /* Remove any methods for this mad agent */
1270         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1271                 if (method->agent[i] == agent)
1272                         method->agent[i] = NULL;
1273 }
1274
1275 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1276                               struct ib_mad_agent_private *agent_priv,
1277                               u8 mgmt_class)
1278 {
1279         struct ib_mad_port_private *port_priv;
1280         struct ib_mad_mgmt_class_table **class;
1281         struct ib_mad_mgmt_method_table **method;
1282         int i, ret;
1283
1284         port_priv = agent_priv->qp_info->port_priv;
1285         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1286         if (!*class) {
1287                 /* Allocate management class table for "new" class version */
1288                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1289                 if (!*class) {
1290                         ret = -ENOMEM;
1291                         goto error1;
1292                 }
1293
1294                 /* Allocate method table for this management class */
1295                 method = &(*class)->method_table[mgmt_class];
1296                 if ((ret = allocate_method_table(method)))
1297                         goto error2;
1298         } else {
1299                 method = &(*class)->method_table[mgmt_class];
1300                 if (!*method) {
1301                         /* Allocate method table for this management class */
1302                         if ((ret = allocate_method_table(method)))
1303                                 goto error1;
1304                 }
1305         }
1306
1307         /* Now, make sure methods are not already in use */
1308         if (method_in_use(method, mad_reg_req))
1309                 goto error3;
1310
1311         /* Finally, add in methods being registered */
1312         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1313                 (*method)->agent[i] = agent_priv;
1314
1315         return 0;
1316
1317 error3:
1318         /* Remove any methods for this mad agent */
1319         remove_methods_mad_agent(*method, agent_priv);
1320         /* Now, check to see if there are any methods in use */
1321         if (!check_method_table(*method)) {
1322                 /* If not, release management method table */
1323                 kfree(*method);
1324                 *method = NULL;
1325         }
1326         ret = -EINVAL;
1327         goto error1;
1328 error2:
1329         kfree(*class);
1330         *class = NULL;
1331 error1:
1332         return ret;
1333 }
1334
1335 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1336                            struct ib_mad_agent_private *agent_priv)
1337 {
1338         struct ib_mad_port_private *port_priv;
1339         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1340         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1341         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1342         struct ib_mad_mgmt_method_table **method;
1343         int i, ret = -ENOMEM;
1344         u8 vclass;
1345
1346         /* "New" vendor (with OUI) class */
1347         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1348         port_priv = agent_priv->qp_info->port_priv;
1349         vendor_table = &port_priv->version[
1350                                 mad_reg_req->mgmt_class_version].vendor;
1351         if (!*vendor_table) {
1352                 /* Allocate mgmt vendor class table for "new" class version */
1353                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1354                 if (!vendor)
1355                         goto error1;
1356
1357                 *vendor_table = vendor;
1358         }
1359         if (!(*vendor_table)->vendor_class[vclass]) {
1360                 /* Allocate table for this management vendor class */
1361                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1362                 if (!vendor_class)
1363                         goto error2;
1364
1365                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1366         }
1367         for (i = 0; i < MAX_MGMT_OUI; i++) {
1368                 /* Is there matching OUI for this vendor class ? */
1369                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1370                             mad_reg_req->oui, 3)) {
1371                         method = &(*vendor_table)->vendor_class[
1372                                                 vclass]->method_table[i];
1373                         if (!*method)
1374                                 goto error3;
1375                         goto check_in_use;
1376                 }
1377         }
1378         for (i = 0; i < MAX_MGMT_OUI; i++) {
1379                 /* OUI slot available ? */
1380                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1381                                 vclass]->oui[i])) {
1382                         method = &(*vendor_table)->vendor_class[
1383                                 vclass]->method_table[i];
1384                         /* Allocate method table for this OUI */
1385                         if (!*method) {
1386                                 ret = allocate_method_table(method);
1387                                 if (ret)
1388                                         goto error3;
1389                         }
1390                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1391                                mad_reg_req->oui, 3);
1392                         goto check_in_use;
1393                 }
1394         }
1395         dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
1396         goto error3;
1397
1398 check_in_use:
1399         /* Now, make sure methods are not already in use */
1400         if (method_in_use(method, mad_reg_req))
1401                 goto error4;
1402
1403         /* Finally, add in methods being registered */
1404         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1405                 (*method)->agent[i] = agent_priv;
1406
1407         return 0;
1408
1409 error4:
1410         /* Remove any methods for this mad agent */
1411         remove_methods_mad_agent(*method, agent_priv);
1412         /* Now, check to see if there are any methods in use */
1413         if (!check_method_table(*method)) {
1414                 /* If not, release management method table */
1415                 kfree(*method);
1416                 *method = NULL;
1417         }
1418         ret = -EINVAL;
1419 error3:
1420         if (vendor_class) {
1421                 (*vendor_table)->vendor_class[vclass] = NULL;
1422                 kfree(vendor_class);
1423         }
1424 error2:
1425         if (vendor) {
1426                 *vendor_table = NULL;
1427                 kfree(vendor);
1428         }
1429 error1:
1430         return ret;
1431 }
1432
1433 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1434 {
1435         struct ib_mad_port_private *port_priv;
1436         struct ib_mad_mgmt_class_table *class;
1437         struct ib_mad_mgmt_method_table *method;
1438         struct ib_mad_mgmt_vendor_class_table *vendor;
1439         struct ib_mad_mgmt_vendor_class *vendor_class;
1440         int index;
1441         u8 mgmt_class;
1442
1443         /*
1444          * Was MAD registration request supplied
1445          * with original registration ?
1446          */
1447         if (!agent_priv->reg_req)
1448                 goto out;
1449
1450         port_priv = agent_priv->qp_info->port_priv;
1451         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1452         class = port_priv->version[
1453                         agent_priv->reg_req->mgmt_class_version].class;
1454         if (!class)
1455                 goto vendor_check;
1456
1457         method = class->method_table[mgmt_class];
1458         if (method) {
1459                 /* Remove any methods for this mad agent */
1460                 remove_methods_mad_agent(method, agent_priv);
1461                 /* Now, check to see if there are any methods still in use */
1462                 if (!check_method_table(method)) {
1463                         /* If not, release management method table */
1464                         kfree(method);
1465                         class->method_table[mgmt_class] = NULL;
1466                         /* Any management classes left ? */
1467                         if (!check_class_table(class)) {
1468                                 /* If not, release management class table */
1469                                 kfree(class);
1470                                 port_priv->version[
1471                                         agent_priv->reg_req->
1472                                         mgmt_class_version].class = NULL;
1473                         }
1474                 }
1475         }
1476
1477 vendor_check:
1478         if (!is_vendor_class(mgmt_class))
1479                 goto out;
1480
1481         /* normalize mgmt_class to vendor range 2 */
1482         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1483         vendor = port_priv->version[
1484                         agent_priv->reg_req->mgmt_class_version].vendor;
1485
1486         if (!vendor)
1487                 goto out;
1488
1489         vendor_class = vendor->vendor_class[mgmt_class];
1490         if (vendor_class) {
1491                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1492                 if (index < 0)
1493                         goto out;
1494                 method = vendor_class->method_table[index];
1495                 if (method) {
1496                         /* Remove any methods for this mad agent */
1497                         remove_methods_mad_agent(method, agent_priv);
1498                         /*
1499                          * Now, check to see if there are
1500                          * any methods still in use
1501                          */
1502                         if (!check_method_table(method)) {
1503                                 /* If not, release management method table */
1504                                 kfree(method);
1505                                 vendor_class->method_table[index] = NULL;
1506                                 memset(vendor_class->oui[index], 0, 3);
1507                                 /* Any OUIs left ? */
1508                                 if (!check_vendor_class(vendor_class)) {
1509                                         /* If not, release vendor class table */
1510                                         kfree(vendor_class);
1511                                         vendor->vendor_class[mgmt_class] = NULL;
1512                                         /* Any other vendor classes left ? */
1513                                         if (!check_vendor_table(vendor)) {
1514                                                 kfree(vendor);
1515                                                 port_priv->version[
1516                                                         agent_priv->reg_req->
1517                                                         mgmt_class_version].
1518                                                         vendor = NULL;
1519                                         }
1520                                 }
1521                         }
1522                 }
1523         }
1524
1525 out:
1526         return;
1527 }
1528
1529 static struct ib_mad_agent_private *
1530 find_mad_agent(struct ib_mad_port_private *port_priv,
1531                const struct ib_mad_hdr *mad_hdr)
1532 {
1533         struct ib_mad_agent_private *mad_agent = NULL;
1534         unsigned long flags;
1535
1536         if (ib_response_mad(mad_hdr)) {
1537                 u32 hi_tid;
1538
1539                 /*
1540                  * Routing is based on high 32 bits of transaction ID
1541                  * of MAD.
1542                  */
1543                 hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1544                 rcu_read_lock();
1545                 mad_agent = xa_load(&ib_mad_clients, hi_tid);
1546                 if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount))
1547                         mad_agent = NULL;
1548                 rcu_read_unlock();
1549         } else {
1550                 struct ib_mad_mgmt_class_table *class;
1551                 struct ib_mad_mgmt_method_table *method;
1552                 struct ib_mad_mgmt_vendor_class_table *vendor;
1553                 struct ib_mad_mgmt_vendor_class *vendor_class;
1554                 const struct ib_vendor_mad *vendor_mad;
1555                 int index;
1556
1557                 spin_lock_irqsave(&port_priv->reg_lock, flags);
1558                 /*
1559                  * Routing is based on version, class, and method
1560                  * For "newer" vendor MADs, also based on OUI
1561                  */
1562                 if (mad_hdr->class_version >= MAX_MGMT_VERSION)
1563                         goto out;
1564                 if (!is_vendor_class(mad_hdr->mgmt_class)) {
1565                         class = port_priv->version[
1566                                         mad_hdr->class_version].class;
1567                         if (!class)
1568                                 goto out;
1569                         if (convert_mgmt_class(mad_hdr->mgmt_class) >=
1570                             ARRAY_SIZE(class->method_table))
1571                                 goto out;
1572                         method = class->method_table[convert_mgmt_class(
1573                                                         mad_hdr->mgmt_class)];
1574                         if (method)
1575                                 mad_agent = method->agent[mad_hdr->method &
1576                                                           ~IB_MGMT_METHOD_RESP];
1577                 } else {
1578                         vendor = port_priv->version[
1579                                         mad_hdr->class_version].vendor;
1580                         if (!vendor)
1581                                 goto out;
1582                         vendor_class = vendor->vendor_class[vendor_class_index(
1583                                                 mad_hdr->mgmt_class)];
1584                         if (!vendor_class)
1585                                 goto out;
1586                         /* Find matching OUI */
1587                         vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
1588                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1589                         if (index == -1)
1590                                 goto out;
1591                         method = vendor_class->method_table[index];
1592                         if (method) {
1593                                 mad_agent = method->agent[mad_hdr->method &
1594                                                           ~IB_MGMT_METHOD_RESP];
1595                         }
1596                 }
1597                 if (mad_agent)
1598                         refcount_inc(&mad_agent->refcount);
1599 out:
1600                 spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1601         }
1602
1603         if (mad_agent && !mad_agent->agent.recv_handler) {
1604                 dev_notice(&port_priv->device->dev,
1605                            "No receive handler for client %p on port %u\n",
1606                            &mad_agent->agent, port_priv->port_num);
1607                 deref_mad_agent(mad_agent);
1608                 mad_agent = NULL;
1609         }
1610
1611         return mad_agent;
1612 }
1613
1614 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
1615                         const struct ib_mad_qp_info *qp_info,
1616                         bool opa)
1617 {
1618         int valid = 0;
1619         u32 qp_num = qp_info->qp->qp_num;
1620
1621         /* Make sure MAD base version is understood */
1622         if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
1623             (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
1624                 pr_err("MAD received with unsupported base version %u %s\n",
1625                        mad_hdr->base_version, opa ? "(opa)" : "");
1626                 goto out;
1627         }
1628
1629         /* Filter SMI packets sent to other than QP0 */
1630         if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1631             (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1632                 if (qp_num == 0)
1633                         valid = 1;
1634         } else {
1635                 /* CM attributes other than ClassPortInfo only use Send method */
1636                 if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
1637                     (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
1638                     (mad_hdr->method != IB_MGMT_METHOD_SEND))
1639                         goto out;
1640                 /* Filter GSI packets sent to QP0 */
1641                 if (qp_num != 0)
1642                         valid = 1;
1643         }
1644
1645 out:
1646         return valid;
1647 }
1648
1649 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
1650                             const struct ib_mad_hdr *mad_hdr)
1651 {
1652         struct ib_rmpp_mad *rmpp_mad;
1653
1654         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1655         return !mad_agent_priv->agent.rmpp_version ||
1656                 !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1657                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1658                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1659                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1660 }
1661
1662 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
1663                                      const struct ib_mad_recv_wc *rwc)
1664 {
1665         return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1666                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1667 }
1668
1669 static inline int
1670 rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
1671                  const struct ib_mad_send_wr_private *wr,
1672                  const struct ib_mad_recv_wc *rwc)
1673 {
1674         struct rdma_ah_attr attr;
1675         u8 send_resp, rcv_resp;
1676         union ib_gid sgid;
1677         struct ib_device *device = mad_agent_priv->agent.device;
1678         u32 port_num = mad_agent_priv->agent.port_num;
1679         u8 lmc;
1680         bool has_grh;
1681
1682         send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
1683         rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1684
1685         if (send_resp == rcv_resp)
1686                 /* both requests, or both responses. GIDs different */
1687                 return 0;
1688
1689         if (rdma_query_ah(wr->send_buf.ah, &attr))
1690                 /* Assume not equal, to avoid false positives. */
1691                 return 0;
1692
1693         has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
1694         if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1695                 /* one has GID, other does not.  Assume different */
1696                 return 0;
1697
1698         if (!send_resp && rcv_resp) {
1699                 /* is request/response. */
1700                 if (!has_grh) {
1701                         if (ib_get_cached_lmc(device, port_num, &lmc))
1702                                 return 0;
1703                         return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1704                                            rwc->wc->dlid_path_bits) &
1705                                           ((1 << lmc) - 1)));
1706                 } else {
1707                         const struct ib_global_route *grh =
1708                                         rdma_ah_read_grh(&attr);
1709
1710                         if (rdma_query_gid(device, port_num,
1711                                            grh->sgid_index, &sgid))
1712                                 return 0;
1713                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1714                                        16);
1715                 }
1716         }
1717
1718         if (!has_grh)
1719                 return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1720         else
1721                 return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
1722                                rwc->recv_buf.grh->sgid.raw,
1723                                16);
1724 }
1725
1726 static inline int is_direct(u8 class)
1727 {
1728         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1729 }
1730
1731 struct ib_mad_send_wr_private*
1732 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
1733                  const struct ib_mad_recv_wc *wc)
1734 {
1735         struct ib_mad_send_wr_private *wr;
1736         const struct ib_mad_hdr *mad_hdr;
1737
1738         mad_hdr = &wc->recv_buf.mad->mad_hdr;
1739
1740         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1741                 if ((wr->tid == mad_hdr->tid) &&
1742                     rcv_has_same_class(wr, wc) &&
1743                     /*
1744                      * Don't check GID for direct routed MADs.
1745                      * These might have permissive LIDs.
1746                      */
1747                     (is_direct(mad_hdr->mgmt_class) ||
1748                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1749                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1750         }
1751
1752         /*
1753          * It's possible to receive the response before we've
1754          * been notified that the send has completed
1755          */
1756         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1757                 if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1758                     wr->tid == mad_hdr->tid &&
1759                     wr->timeout &&
1760                     rcv_has_same_class(wr, wc) &&
1761                     /*
1762                      * Don't check GID for direct routed MADs.
1763                      * These might have permissive LIDs.
1764                      */
1765                     (is_direct(mad_hdr->mgmt_class) ||
1766                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1767                         /* Verify request has not been canceled */
1768                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1769         }
1770         return NULL;
1771 }
1772
1773 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1774 {
1775         mad_send_wr->timeout = 0;
1776         if (mad_send_wr->refcount == 1)
1777                 list_move_tail(&mad_send_wr->agent_list,
1778                               &mad_send_wr->mad_agent_priv->done_list);
1779 }
1780
1781 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1782                                  struct ib_mad_recv_wc *mad_recv_wc)
1783 {
1784         struct ib_mad_send_wr_private *mad_send_wr;
1785         struct ib_mad_send_wc mad_send_wc;
1786         unsigned long flags;
1787         int ret;
1788
1789         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1790         ret = ib_mad_enforce_security(mad_agent_priv,
1791                                       mad_recv_wc->wc->pkey_index);
1792         if (ret) {
1793                 ib_free_recv_mad(mad_recv_wc);
1794                 deref_mad_agent(mad_agent_priv);
1795                 return;
1796         }
1797
1798         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1799         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1800                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1801                                                       mad_recv_wc);
1802                 if (!mad_recv_wc) {
1803                         deref_mad_agent(mad_agent_priv);
1804                         return;
1805                 }
1806         }
1807
1808         /* Complete corresponding request */
1809         if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
1810                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1811                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1812                 if (!mad_send_wr) {
1813                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1814                         if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
1815                            && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
1816                            && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
1817                                         & IB_MGMT_RMPP_FLAG_ACTIVE)) {
1818                                 /* user rmpp is in effect
1819                                  * and this is an active RMPP MAD
1820                                  */
1821                                 mad_agent_priv->agent.recv_handler(
1822                                                 &mad_agent_priv->agent, NULL,
1823                                                 mad_recv_wc);
1824                                 deref_mad_agent(mad_agent_priv);
1825                         } else {
1826                                 /* not user rmpp, revert to normal behavior and
1827                                  * drop the mad
1828                                  */
1829                                 ib_free_recv_mad(mad_recv_wc);
1830                                 deref_mad_agent(mad_agent_priv);
1831                                 return;
1832                         }
1833                 } else {
1834                         ib_mark_mad_done(mad_send_wr);
1835                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1836
1837                         /* Defined behavior is to complete response before request */
1838                         mad_agent_priv->agent.recv_handler(
1839                                         &mad_agent_priv->agent,
1840                                         &mad_send_wr->send_buf,
1841                                         mad_recv_wc);
1842                         deref_mad_agent(mad_agent_priv);
1843
1844                         mad_send_wc.status = IB_WC_SUCCESS;
1845                         mad_send_wc.vendor_err = 0;
1846                         mad_send_wc.send_buf = &mad_send_wr->send_buf;
1847                         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1848                 }
1849         } else {
1850                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
1851                                                    mad_recv_wc);
1852                 deref_mad_agent(mad_agent_priv);
1853         }
1854 }
1855
1856 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
1857                                      const struct ib_mad_qp_info *qp_info,
1858                                      const struct ib_wc *wc,
1859                                      u32 port_num,
1860                                      struct ib_mad_private *recv,
1861                                      struct ib_mad_private *response)
1862 {
1863         enum smi_forward_action retsmi;
1864         struct ib_smp *smp = (struct ib_smp *)recv->mad;
1865
1866         trace_ib_mad_handle_ib_smi(smp);
1867
1868         if (smi_handle_dr_smp_recv(smp,
1869                                    rdma_cap_ib_switch(port_priv->device),
1870                                    port_num,
1871                                    port_priv->device->phys_port_cnt) ==
1872                                    IB_SMI_DISCARD)
1873                 return IB_SMI_DISCARD;
1874
1875         retsmi = smi_check_forward_dr_smp(smp);
1876         if (retsmi == IB_SMI_LOCAL)
1877                 return IB_SMI_HANDLE;
1878
1879         if (retsmi == IB_SMI_SEND) { /* don't forward */
1880                 if (smi_handle_dr_smp_send(smp,
1881                                            rdma_cap_ib_switch(port_priv->device),
1882                                            port_num) == IB_SMI_DISCARD)
1883                         return IB_SMI_DISCARD;
1884
1885                 if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
1886                         return IB_SMI_DISCARD;
1887         } else if (rdma_cap_ib_switch(port_priv->device)) {
1888                 /* forward case for switches */
1889                 memcpy(response, recv, mad_priv_size(response));
1890                 response->header.recv_wc.wc = &response->header.wc;
1891                 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1892                 response->header.recv_wc.recv_buf.grh = &response->grh;
1893
1894                 agent_send_response((const struct ib_mad_hdr *)response->mad,
1895                                     &response->grh, wc,
1896                                     port_priv->device,
1897                                     smi_get_fwd_port(smp),
1898                                     qp_info->qp->qp_num,
1899                                     response->mad_size,
1900                                     false);
1901
1902                 return IB_SMI_DISCARD;
1903         }
1904         return IB_SMI_HANDLE;
1905 }
1906
1907 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
1908                                     struct ib_mad_private *response,
1909                                     size_t *resp_len, bool opa)
1910 {
1911         const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
1912         struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
1913
1914         if (recv_hdr->method == IB_MGMT_METHOD_GET ||
1915             recv_hdr->method == IB_MGMT_METHOD_SET) {
1916                 memcpy(response, recv, mad_priv_size(response));
1917                 response->header.recv_wc.wc = &response->header.wc;
1918                 response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
1919                 response->header.recv_wc.recv_buf.grh = &response->grh;
1920                 resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
1921                 resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
1922                 if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1923                         resp_hdr->status |= IB_SMP_DIRECTION;
1924
1925                 if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
1926                         if (recv_hdr->mgmt_class ==
1927                             IB_MGMT_CLASS_SUBN_LID_ROUTED ||
1928                             recv_hdr->mgmt_class ==
1929                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
1930                                 *resp_len = opa_get_smp_header_size(
1931                                                         (struct opa_smp *)recv->mad);
1932                         else
1933                                 *resp_len = sizeof(struct ib_mad_hdr);
1934                 }
1935
1936                 return true;
1937         } else {
1938                 return false;
1939         }
1940 }
1941
1942 static enum smi_action
1943 handle_opa_smi(struct ib_mad_port_private *port_priv,
1944                struct ib_mad_qp_info *qp_info,
1945                struct ib_wc *wc,
1946                u32 port_num,
1947                struct ib_mad_private *recv,
1948                struct ib_mad_private *response)
1949 {
1950         enum smi_forward_action retsmi;
1951         struct opa_smp *smp = (struct opa_smp *)recv->mad;
1952
1953         trace_ib_mad_handle_opa_smi(smp);
1954
1955         if (opa_smi_handle_dr_smp_recv(smp,
1956                                    rdma_cap_ib_switch(port_priv->device),
1957                                    port_num,
1958                                    port_priv->device->phys_port_cnt) ==
1959                                    IB_SMI_DISCARD)
1960                 return IB_SMI_DISCARD;
1961
1962         retsmi = opa_smi_check_forward_dr_smp(smp);
1963         if (retsmi == IB_SMI_LOCAL)
1964                 return IB_SMI_HANDLE;
1965
1966         if (retsmi == IB_SMI_SEND) { /* don't forward */
1967                 if (opa_smi_handle_dr_smp_send(smp,
1968                                            rdma_cap_ib_switch(port_priv->device),
1969                                            port_num) == IB_SMI_DISCARD)
1970                         return IB_SMI_DISCARD;
1971
1972                 if (opa_smi_check_local_smp(smp, port_priv->device) ==
1973                     IB_SMI_DISCARD)
1974                         return IB_SMI_DISCARD;
1975
1976         } else if (rdma_cap_ib_switch(port_priv->device)) {
1977                 /* forward case for switches */
1978                 memcpy(response, recv, mad_priv_size(response));
1979                 response->header.recv_wc.wc = &response->header.wc;
1980                 response->header.recv_wc.recv_buf.opa_mad =
1981                                 (struct opa_mad *)response->mad;
1982                 response->header.recv_wc.recv_buf.grh = &response->grh;
1983
1984                 agent_send_response((const struct ib_mad_hdr *)response->mad,
1985                                     &response->grh, wc,
1986                                     port_priv->device,
1987                                     opa_smi_get_fwd_port(smp),
1988                                     qp_info->qp->qp_num,
1989                                     recv->header.wc.byte_len,
1990                                     true);
1991
1992                 return IB_SMI_DISCARD;
1993         }
1994
1995         return IB_SMI_HANDLE;
1996 }
1997
1998 static enum smi_action
1999 handle_smi(struct ib_mad_port_private *port_priv,
2000            struct ib_mad_qp_info *qp_info,
2001            struct ib_wc *wc,
2002            u32 port_num,
2003            struct ib_mad_private *recv,
2004            struct ib_mad_private *response,
2005            bool opa)
2006 {
2007         struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
2008
2009         if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2010             mad_hdr->class_version == OPA_SM_CLASS_VERSION)
2011                 return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
2012                                       response);
2013
2014         return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
2015 }
2016
2017 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2018 {
2019         struct ib_mad_port_private *port_priv = cq->cq_context;
2020         struct ib_mad_list_head *mad_list =
2021                 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2022         struct ib_mad_qp_info *qp_info;
2023         struct ib_mad_private_header *mad_priv_hdr;
2024         struct ib_mad_private *recv, *response = NULL;
2025         struct ib_mad_agent_private *mad_agent;
2026         u32 port_num;
2027         int ret = IB_MAD_RESULT_SUCCESS;
2028         size_t mad_size;
2029         u16 resp_mad_pkey_index = 0;
2030         bool opa;
2031
2032         if (list_empty_careful(&port_priv->port_list))
2033                 return;
2034
2035         if (wc->status != IB_WC_SUCCESS) {
2036                 /*
2037                  * Receive errors indicate that the QP has entered the error
2038                  * state - error handling/shutdown code will cleanup
2039                  */
2040                 return;
2041         }
2042
2043         qp_info = mad_list->mad_queue->qp_info;
2044         dequeue_mad(mad_list);
2045
2046         opa = rdma_cap_opa_mad(qp_info->port_priv->device,
2047                                qp_info->port_priv->port_num);
2048
2049         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
2050                                     mad_list);
2051         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2052         ib_dma_unmap_single(port_priv->device,
2053                             recv->header.mapping,
2054                             mad_priv_dma_size(recv),
2055                             DMA_FROM_DEVICE);
2056
2057         /* Setup MAD receive work completion from "normal" work completion */
2058         recv->header.wc = *wc;
2059         recv->header.recv_wc.wc = &recv->header.wc;
2060
2061         if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
2062                 recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
2063                 recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2064         } else {
2065                 recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2066                 recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2067         }
2068
2069         recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
2070         recv->header.recv_wc.recv_buf.grh = &recv->grh;
2071
2072         /* Validate MAD */
2073         if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
2074                 goto out;
2075
2076         trace_ib_mad_recv_done_handler(qp_info, wc,
2077                                        (struct ib_mad_hdr *)recv->mad);
2078
2079         mad_size = recv->mad_size;
2080         response = alloc_mad_private(mad_size, GFP_KERNEL);
2081         if (!response)
2082                 goto out;
2083
2084         if (rdma_cap_ib_switch(port_priv->device))
2085                 port_num = wc->port_num;
2086         else
2087                 port_num = port_priv->port_num;
2088
2089         if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
2090             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
2091                 if (handle_smi(port_priv, qp_info, wc, port_num, recv,
2092                                response, opa)
2093                     == IB_SMI_DISCARD)
2094                         goto out;
2095         }
2096
2097         /* Give driver "right of first refusal" on incoming MAD */
2098         if (port_priv->device->ops.process_mad) {
2099                 ret = port_priv->device->ops.process_mad(
2100                         port_priv->device, 0, port_priv->port_num, wc,
2101                         &recv->grh, (const struct ib_mad *)recv->mad,
2102                         (struct ib_mad *)response->mad, &mad_size,
2103                         &resp_mad_pkey_index);
2104
2105                 if (opa)
2106                         wc->pkey_index = resp_mad_pkey_index;
2107
2108                 if (ret & IB_MAD_RESULT_SUCCESS) {
2109                         if (ret & IB_MAD_RESULT_CONSUMED)
2110                                 goto out;
2111                         if (ret & IB_MAD_RESULT_REPLY) {
2112                                 agent_send_response((const struct ib_mad_hdr *)response->mad,
2113                                                     &recv->grh, wc,
2114                                                     port_priv->device,
2115                                                     port_num,
2116                                                     qp_info->qp->qp_num,
2117                                                     mad_size, opa);
2118                                 goto out;
2119                         }
2120                 }
2121         }
2122
2123         mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
2124         if (mad_agent) {
2125                 trace_ib_mad_recv_done_agent(mad_agent);
2126                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
2127                 /*
2128                  * recv is freed up in error cases in ib_mad_complete_recv
2129                  * or via recv_handler in ib_mad_complete_recv()
2130                  */
2131                 recv = NULL;
2132         } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
2133                    generate_unmatched_resp(recv, response, &mad_size, opa)) {
2134                 agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
2135                                     port_priv->device, port_num,
2136                                     qp_info->qp->qp_num, mad_size, opa);
2137         }
2138
2139 out:
2140         /* Post another receive request for this QP */
2141         if (response) {
2142                 ib_mad_post_receive_mads(qp_info, response);
2143                 kfree(recv);
2144         } else
2145                 ib_mad_post_receive_mads(qp_info, recv);
2146 }
2147
2148 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
2149 {
2150         struct ib_mad_send_wr_private *mad_send_wr;
2151         unsigned long delay;
2152
2153         if (list_empty(&mad_agent_priv->wait_list)) {
2154                 cancel_delayed_work(&mad_agent_priv->timed_work);
2155         } else {
2156                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2157                                          struct ib_mad_send_wr_private,
2158                                          agent_list);
2159
2160                 if (time_after(mad_agent_priv->timeout,
2161                                mad_send_wr->timeout)) {
2162                         mad_agent_priv->timeout = mad_send_wr->timeout;
2163                         delay = mad_send_wr->timeout - jiffies;
2164                         if ((long)delay <= 0)
2165                                 delay = 1;
2166                         mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2167                                          &mad_agent_priv->timed_work, delay);
2168                 }
2169         }
2170 }
2171
2172 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2173 {
2174         struct ib_mad_agent_private *mad_agent_priv;
2175         struct ib_mad_send_wr_private *temp_mad_send_wr;
2176         struct list_head *list_item;
2177         unsigned long delay;
2178
2179         mad_agent_priv = mad_send_wr->mad_agent_priv;
2180         list_del(&mad_send_wr->agent_list);
2181
2182         delay = mad_send_wr->timeout;
2183         mad_send_wr->timeout += jiffies;
2184
2185         if (delay) {
2186                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2187                         temp_mad_send_wr = list_entry(list_item,
2188                                                 struct ib_mad_send_wr_private,
2189                                                 agent_list);
2190                         if (time_after(mad_send_wr->timeout,
2191                                        temp_mad_send_wr->timeout))
2192                                 break;
2193                 }
2194         } else {
2195                 list_item = &mad_agent_priv->wait_list;
2196         }
2197
2198         list_add(&mad_send_wr->agent_list, list_item);
2199
2200         /* Reschedule a work item if we have a shorter timeout */
2201         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
2202                 mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2203                                  &mad_agent_priv->timed_work, delay);
2204 }
2205
2206 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2207                           unsigned long timeout_ms)
2208 {
2209         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2210         wait_for_response(mad_send_wr);
2211 }
2212
2213 /*
2214  * Process a send work completion
2215  */
2216 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2217                              struct ib_mad_send_wc *mad_send_wc)
2218 {
2219         struct ib_mad_agent_private     *mad_agent_priv;
2220         unsigned long                   flags;
2221         int                             ret;
2222
2223         mad_agent_priv = mad_send_wr->mad_agent_priv;
2224         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2225         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2226                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2227                 if (ret == IB_RMPP_RESULT_CONSUMED)
2228                         goto done;
2229         } else
2230                 ret = IB_RMPP_RESULT_UNHANDLED;
2231
2232         if (mad_send_wc->status != IB_WC_SUCCESS &&
2233             mad_send_wr->status == IB_WC_SUCCESS) {
2234                 mad_send_wr->status = mad_send_wc->status;
2235                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2236         }
2237
2238         if (--mad_send_wr->refcount > 0) {
2239                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2240                     mad_send_wr->status == IB_WC_SUCCESS) {
2241                         wait_for_response(mad_send_wr);
2242                 }
2243                 goto done;
2244         }
2245
2246         /* Remove send from MAD agent and notify client of completion */
2247         list_del(&mad_send_wr->agent_list);
2248         adjust_timeout(mad_agent_priv);
2249         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2250
2251         if (mad_send_wr->status != IB_WC_SUCCESS)
2252                 mad_send_wc->status = mad_send_wr->status;
2253         if (ret == IB_RMPP_RESULT_INTERNAL)
2254                 ib_rmpp_send_handler(mad_send_wc);
2255         else
2256                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2257                                                    mad_send_wc);
2258
2259         /* Release reference on agent taken when sending */
2260         deref_mad_agent(mad_agent_priv);
2261         return;
2262 done:
2263         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2264 }
2265
2266 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
2267 {
2268         struct ib_mad_port_private *port_priv = cq->cq_context;
2269         struct ib_mad_list_head *mad_list =
2270                 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2271         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2272         struct ib_mad_qp_info           *qp_info;
2273         struct ib_mad_queue             *send_queue;
2274         struct ib_mad_send_wc           mad_send_wc;
2275         unsigned long flags;
2276         int ret;
2277
2278         if (list_empty_careful(&port_priv->port_list))
2279                 return;
2280
2281         if (wc->status != IB_WC_SUCCESS) {
2282                 if (!ib_mad_send_error(port_priv, wc))
2283                         return;
2284         }
2285
2286         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2287                                    mad_list);
2288         send_queue = mad_list->mad_queue;
2289         qp_info = send_queue->qp_info;
2290
2291         trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
2292         trace_ib_mad_send_done_handler(mad_send_wr, wc);
2293
2294 retry:
2295         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2296                             mad_send_wr->header_mapping,
2297                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2298         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2299                             mad_send_wr->payload_mapping,
2300                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2301         queued_send_wr = NULL;
2302         spin_lock_irqsave(&send_queue->lock, flags);
2303         list_del(&mad_list->list);
2304
2305         /* Move queued send to the send queue */
2306         if (send_queue->count-- > send_queue->max_active) {
2307                 mad_list = container_of(qp_info->overflow_list.next,
2308                                         struct ib_mad_list_head, list);
2309                 queued_send_wr = container_of(mad_list,
2310                                         struct ib_mad_send_wr_private,
2311                                         mad_list);
2312                 list_move_tail(&mad_list->list, &send_queue->list);
2313         }
2314         spin_unlock_irqrestore(&send_queue->lock, flags);
2315
2316         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2317         mad_send_wc.status = wc->status;
2318         mad_send_wc.vendor_err = wc->vendor_err;
2319         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2320
2321         if (queued_send_wr) {
2322                 trace_ib_mad_send_done_resend(queued_send_wr, qp_info);
2323                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2324                                    NULL);
2325                 if (ret) {
2326                         dev_err(&port_priv->device->dev,
2327                                 "ib_post_send failed: %d\n", ret);
2328                         mad_send_wr = queued_send_wr;
2329                         wc->status = IB_WC_LOC_QP_OP_ERR;
2330                         goto retry;
2331                 }
2332         }
2333 }
2334
2335 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2336 {
2337         struct ib_mad_send_wr_private *mad_send_wr;
2338         struct ib_mad_list_head *mad_list;
2339         unsigned long flags;
2340
2341         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2342         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2343                 mad_send_wr = container_of(mad_list,
2344                                            struct ib_mad_send_wr_private,
2345                                            mad_list);
2346                 mad_send_wr->retry = 1;
2347         }
2348         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2349 }
2350
2351 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
2352                 struct ib_wc *wc)
2353 {
2354         struct ib_mad_list_head *mad_list =
2355                 container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
2356         struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
2357         struct ib_mad_send_wr_private *mad_send_wr;
2358         int ret;
2359
2360         /*
2361          * Send errors will transition the QP to SQE - move
2362          * QP to RTS and repost flushed work requests
2363          */
2364         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2365                                    mad_list);
2366         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2367                 if (mad_send_wr->retry) {
2368                         /* Repost send */
2369                         mad_send_wr->retry = 0;
2370                         trace_ib_mad_error_handler(mad_send_wr, qp_info);
2371                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
2372                                            NULL);
2373                         if (!ret)
2374                                 return false;
2375                 }
2376         } else {
2377                 struct ib_qp_attr *attr;
2378
2379                 /* Transition QP to RTS and fail offending send */
2380                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2381                 if (attr) {
2382                         attr->qp_state = IB_QPS_RTS;
2383                         attr->cur_qp_state = IB_QPS_SQE;
2384                         ret = ib_modify_qp(qp_info->qp, attr,
2385                                            IB_QP_STATE | IB_QP_CUR_STATE);
2386                         kfree(attr);
2387                         if (ret)
2388                                 dev_err(&port_priv->device->dev,
2389                                         "%s - ib_modify_qp to RTS: %d\n",
2390                                         __func__, ret);
2391                         else
2392                                 mark_sends_for_retry(qp_info);
2393                 }
2394         }
2395
2396         return true;
2397 }
2398
2399 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2400 {
2401         unsigned long flags;
2402         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2403         struct ib_mad_send_wc mad_send_wc;
2404         struct list_head cancel_list;
2405
2406         INIT_LIST_HEAD(&cancel_list);
2407
2408         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2409         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2410                                  &mad_agent_priv->send_list, agent_list) {
2411                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2412                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2413                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2414                 }
2415         }
2416
2417         /* Empty wait list to prevent receives from finding a request */
2418         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2419         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2420
2421         /* Report all cancelled requests */
2422         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2423         mad_send_wc.vendor_err = 0;
2424
2425         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2426                                  &cancel_list, agent_list) {
2427                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2428                 list_del(&mad_send_wr->agent_list);
2429                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2430                                                    &mad_send_wc);
2431                 deref_mad_agent(mad_agent_priv);
2432         }
2433 }
2434
2435 static struct ib_mad_send_wr_private*
2436 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2437              struct ib_mad_send_buf *send_buf)
2438 {
2439         struct ib_mad_send_wr_private *mad_send_wr;
2440
2441         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2442                             agent_list) {
2443                 if (&mad_send_wr->send_buf == send_buf)
2444                         return mad_send_wr;
2445         }
2446
2447         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2448                             agent_list) {
2449                 if (is_rmpp_data_mad(mad_agent_priv,
2450                                      mad_send_wr->send_buf.mad) &&
2451                     &mad_send_wr->send_buf == send_buf)
2452                         return mad_send_wr;
2453         }
2454         return NULL;
2455 }
2456
2457 int ib_modify_mad(struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2458 {
2459         struct ib_mad_agent_private *mad_agent_priv;
2460         struct ib_mad_send_wr_private *mad_send_wr;
2461         unsigned long flags;
2462         int active;
2463
2464         if (!send_buf)
2465                 return -EINVAL;
2466
2467         mad_agent_priv = container_of(send_buf->mad_agent,
2468                                       struct ib_mad_agent_private, agent);
2469         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2470         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2471         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2472                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2473                 return -EINVAL;
2474         }
2475
2476         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2477         if (!timeout_ms) {
2478                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2479                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2480         }
2481
2482         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2483         if (active)
2484                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2485         else
2486                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2487
2488         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2489         return 0;
2490 }
2491 EXPORT_SYMBOL(ib_modify_mad);
2492
2493 static void local_completions(struct work_struct *work)
2494 {
2495         struct ib_mad_agent_private *mad_agent_priv;
2496         struct ib_mad_local_private *local;
2497         struct ib_mad_agent_private *recv_mad_agent;
2498         unsigned long flags;
2499         int free_mad;
2500         struct ib_wc wc;
2501         struct ib_mad_send_wc mad_send_wc;
2502         bool opa;
2503
2504         mad_agent_priv =
2505                 container_of(work, struct ib_mad_agent_private, local_work);
2506
2507         opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
2508                                mad_agent_priv->qp_info->port_priv->port_num);
2509
2510         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2511         while (!list_empty(&mad_agent_priv->local_list)) {
2512                 local = list_entry(mad_agent_priv->local_list.next,
2513                                    struct ib_mad_local_private,
2514                                    completion_list);
2515                 list_del(&local->completion_list);
2516                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2517                 free_mad = 0;
2518                 if (local->mad_priv) {
2519                         u8 base_version;
2520                         recv_mad_agent = local->recv_mad_agent;
2521                         if (!recv_mad_agent) {
2522                                 dev_err(&mad_agent_priv->agent.device->dev,
2523                                         "No receive MAD agent for local completion\n");
2524                                 free_mad = 1;
2525                                 goto local_send_completion;
2526                         }
2527
2528                         /*
2529                          * Defined behavior is to complete response
2530                          * before request
2531                          */
2532                         build_smp_wc(recv_mad_agent->agent.qp,
2533                                      local->mad_send_wr->send_wr.wr.wr_cqe,
2534                                      be16_to_cpu(IB_LID_PERMISSIVE),
2535                                      local->mad_send_wr->send_wr.pkey_index,
2536                                      recv_mad_agent->agent.port_num, &wc);
2537
2538                         local->mad_priv->header.recv_wc.wc = &wc;
2539
2540                         base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
2541                         if (opa && base_version == OPA_MGMT_BASE_VERSION) {
2542                                 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
2543                                 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
2544                         } else {
2545                                 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
2546                                 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
2547                         }
2548
2549                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2550                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2551                                  &local->mad_priv->header.recv_wc.rmpp_list);
2552                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2553                         local->mad_priv->header.recv_wc.recv_buf.mad =
2554                                                 (struct ib_mad *)local->mad_priv->mad;
2555                         recv_mad_agent->agent.recv_handler(
2556                                                 &recv_mad_agent->agent,
2557                                                 &local->mad_send_wr->send_buf,
2558                                                 &local->mad_priv->header.recv_wc);
2559                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2560                         deref_mad_agent(recv_mad_agent);
2561                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2562                 }
2563
2564 local_send_completion:
2565                 /* Complete send */
2566                 mad_send_wc.status = IB_WC_SUCCESS;
2567                 mad_send_wc.vendor_err = 0;
2568                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2569                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2570                                                    &mad_send_wc);
2571
2572                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2573                 deref_mad_agent(mad_agent_priv);
2574                 if (free_mad)
2575                         kfree(local->mad_priv);
2576                 kfree(local);
2577         }
2578         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2579 }
2580
2581 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2582 {
2583         int ret;
2584
2585         if (!mad_send_wr->retries_left)
2586                 return -ETIMEDOUT;
2587
2588         mad_send_wr->retries_left--;
2589         mad_send_wr->send_buf.retries++;
2590
2591         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2592
2593         if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2594                 ret = ib_retry_rmpp(mad_send_wr);
2595                 switch (ret) {
2596                 case IB_RMPP_RESULT_UNHANDLED:
2597                         ret = ib_send_mad(mad_send_wr);
2598                         break;
2599                 case IB_RMPP_RESULT_CONSUMED:
2600                         ret = 0;
2601                         break;
2602                 default:
2603                         ret = -ECOMM;
2604                         break;
2605                 }
2606         } else
2607                 ret = ib_send_mad(mad_send_wr);
2608
2609         if (!ret) {
2610                 mad_send_wr->refcount++;
2611                 list_add_tail(&mad_send_wr->agent_list,
2612                               &mad_send_wr->mad_agent_priv->send_list);
2613         }
2614         return ret;
2615 }
2616
2617 static void timeout_sends(struct work_struct *work)
2618 {
2619         struct ib_mad_agent_private *mad_agent_priv;
2620         struct ib_mad_send_wr_private *mad_send_wr;
2621         struct ib_mad_send_wc mad_send_wc;
2622         unsigned long flags, delay;
2623
2624         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2625                                       timed_work.work);
2626         mad_send_wc.vendor_err = 0;
2627
2628         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2629         while (!list_empty(&mad_agent_priv->wait_list)) {
2630                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2631                                          struct ib_mad_send_wr_private,
2632                                          agent_list);
2633
2634                 if (time_after(mad_send_wr->timeout, jiffies)) {
2635                         delay = mad_send_wr->timeout - jiffies;
2636                         if ((long)delay <= 0)
2637                                 delay = 1;
2638                         queue_delayed_work(mad_agent_priv->qp_info->
2639                                            port_priv->wq,
2640                                            &mad_agent_priv->timed_work, delay);
2641                         break;
2642                 }
2643
2644                 list_del(&mad_send_wr->agent_list);
2645                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2646                     !retry_send(mad_send_wr))
2647                         continue;
2648
2649                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2650
2651                 if (mad_send_wr->status == IB_WC_SUCCESS)
2652                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2653                 else
2654                         mad_send_wc.status = mad_send_wr->status;
2655                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2656                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2657                                                    &mad_send_wc);
2658
2659                 deref_mad_agent(mad_agent_priv);
2660                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2661         }
2662         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2663 }
2664
2665 /*
2666  * Allocate receive MADs and post receive WRs for them
2667  */
2668 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2669                                     struct ib_mad_private *mad)
2670 {
2671         unsigned long flags;
2672         int post, ret;
2673         struct ib_mad_private *mad_priv;
2674         struct ib_sge sg_list;
2675         struct ib_recv_wr recv_wr;
2676         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2677
2678         /* Initialize common scatter list fields */
2679         sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
2680
2681         /* Initialize common receive WR fields */
2682         recv_wr.next = NULL;
2683         recv_wr.sg_list = &sg_list;
2684         recv_wr.num_sge = 1;
2685
2686         do {
2687                 /* Allocate and map receive buffer */
2688                 if (mad) {
2689                         mad_priv = mad;
2690                         mad = NULL;
2691                 } else {
2692                         mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
2693                                                      GFP_ATOMIC);
2694                         if (!mad_priv) {
2695                                 ret = -ENOMEM;
2696                                 break;
2697                         }
2698                 }
2699                 sg_list.length = mad_priv_dma_size(mad_priv);
2700                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2701                                                  &mad_priv->grh,
2702                                                  mad_priv_dma_size(mad_priv),
2703                                                  DMA_FROM_DEVICE);
2704                 if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
2705                                                   sg_list.addr))) {
2706                         kfree(mad_priv);
2707                         ret = -ENOMEM;
2708                         break;
2709                 }
2710                 mad_priv->header.mapping = sg_list.addr;
2711                 mad_priv->header.mad_list.mad_queue = recv_queue;
2712                 mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
2713                 recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
2714
2715                 /* Post receive WR */
2716                 spin_lock_irqsave(&recv_queue->lock, flags);
2717                 post = (++recv_queue->count < recv_queue->max_active);
2718                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2719                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2720                 ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
2721                 if (ret) {
2722                         spin_lock_irqsave(&recv_queue->lock, flags);
2723                         list_del(&mad_priv->header.mad_list.list);
2724                         recv_queue->count--;
2725                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2726                         ib_dma_unmap_single(qp_info->port_priv->device,
2727                                             mad_priv->header.mapping,
2728                                             mad_priv_dma_size(mad_priv),
2729                                             DMA_FROM_DEVICE);
2730                         kfree(mad_priv);
2731                         dev_err(&qp_info->port_priv->device->dev,
2732                                 "ib_post_recv failed: %d\n", ret);
2733                         break;
2734                 }
2735         } while (post);
2736
2737         return ret;
2738 }
2739
2740 /*
2741  * Return all the posted receive MADs
2742  */
2743 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2744 {
2745         struct ib_mad_private_header *mad_priv_hdr;
2746         struct ib_mad_private *recv;
2747         struct ib_mad_list_head *mad_list;
2748
2749         if (!qp_info->qp)
2750                 return;
2751
2752         while (!list_empty(&qp_info->recv_queue.list)) {
2753
2754                 mad_list = list_entry(qp_info->recv_queue.list.next,
2755                                       struct ib_mad_list_head, list);
2756                 mad_priv_hdr = container_of(mad_list,
2757                                             struct ib_mad_private_header,
2758                                             mad_list);
2759                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2760                                     header);
2761
2762                 /* Remove from posted receive MAD list */
2763                 list_del(&mad_list->list);
2764
2765                 ib_dma_unmap_single(qp_info->port_priv->device,
2766                                     recv->header.mapping,
2767                                     mad_priv_dma_size(recv),
2768                                     DMA_FROM_DEVICE);
2769                 kfree(recv);
2770         }
2771
2772         qp_info->recv_queue.count = 0;
2773 }
2774
2775 /*
2776  * Start the port
2777  */
2778 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2779 {
2780         int ret, i;
2781         struct ib_qp_attr *attr;
2782         struct ib_qp *qp;
2783         u16 pkey_index;
2784
2785         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2786         if (!attr)
2787                 return -ENOMEM;
2788
2789         ret = ib_find_pkey(port_priv->device, port_priv->port_num,
2790                            IB_DEFAULT_PKEY_FULL, &pkey_index);
2791         if (ret)
2792                 pkey_index = 0;
2793
2794         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2795                 qp = port_priv->qp_info[i].qp;
2796                 if (!qp)
2797                         continue;
2798
2799                 /*
2800                  * PKey index for QP1 is irrelevant but
2801                  * one is needed for the Reset to Init transition
2802                  */
2803                 attr->qp_state = IB_QPS_INIT;
2804                 attr->pkey_index = pkey_index;
2805                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2806                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2807                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2808                 if (ret) {
2809                         dev_err(&port_priv->device->dev,
2810                                 "Couldn't change QP%d state to INIT: %d\n",
2811                                 i, ret);
2812                         goto out;
2813                 }
2814
2815                 attr->qp_state = IB_QPS_RTR;
2816                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2817                 if (ret) {
2818                         dev_err(&port_priv->device->dev,
2819                                 "Couldn't change QP%d state to RTR: %d\n",
2820                                 i, ret);
2821                         goto out;
2822                 }
2823
2824                 attr->qp_state = IB_QPS_RTS;
2825                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2826                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2827                 if (ret) {
2828                         dev_err(&port_priv->device->dev,
2829                                 "Couldn't change QP%d state to RTS: %d\n",
2830                                 i, ret);
2831                         goto out;
2832                 }
2833         }
2834
2835         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2836         if (ret) {
2837                 dev_err(&port_priv->device->dev,
2838                         "Failed to request completion notification: %d\n",
2839                         ret);
2840                 goto out;
2841         }
2842
2843         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2844                 if (!port_priv->qp_info[i].qp)
2845                         continue;
2846
2847                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2848                 if (ret) {
2849                         dev_err(&port_priv->device->dev,
2850                                 "Couldn't post receive WRs\n");
2851                         goto out;
2852                 }
2853         }
2854 out:
2855         kfree(attr);
2856         return ret;
2857 }
2858
2859 static void qp_event_handler(struct ib_event *event, void *qp_context)
2860 {
2861         struct ib_mad_qp_info   *qp_info = qp_context;
2862
2863         /* It's worse than that! He's dead, Jim! */
2864         dev_err(&qp_info->port_priv->device->dev,
2865                 "Fatal error (%d) on MAD QP (%u)\n",
2866                 event->event, qp_info->qp->qp_num);
2867 }
2868
2869 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2870                            struct ib_mad_queue *mad_queue)
2871 {
2872         mad_queue->qp_info = qp_info;
2873         mad_queue->count = 0;
2874         spin_lock_init(&mad_queue->lock);
2875         INIT_LIST_HEAD(&mad_queue->list);
2876 }
2877
2878 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2879                         struct ib_mad_qp_info *qp_info)
2880 {
2881         qp_info->port_priv = port_priv;
2882         init_mad_queue(qp_info, &qp_info->send_queue);
2883         init_mad_queue(qp_info, &qp_info->recv_queue);
2884         INIT_LIST_HEAD(&qp_info->overflow_list);
2885 }
2886
2887 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2888                          enum ib_qp_type qp_type)
2889 {
2890         struct ib_qp_init_attr  qp_init_attr;
2891         int ret;
2892
2893         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2894         qp_init_attr.send_cq = qp_info->port_priv->cq;
2895         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2896         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2897         qp_init_attr.cap.max_send_wr = mad_sendq_size;
2898         qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2899         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2900         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2901         qp_init_attr.qp_type = qp_type;
2902         qp_init_attr.port_num = qp_info->port_priv->port_num;
2903         qp_init_attr.qp_context = qp_info;
2904         qp_init_attr.event_handler = qp_event_handler;
2905         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2906         if (IS_ERR(qp_info->qp)) {
2907                 dev_err(&qp_info->port_priv->device->dev,
2908                         "Couldn't create ib_mad QP%d\n",
2909                         get_spl_qp_index(qp_type));
2910                 ret = PTR_ERR(qp_info->qp);
2911                 goto error;
2912         }
2913         /* Use minimum queue sizes unless the CQ is resized */
2914         qp_info->send_queue.max_active = mad_sendq_size;
2915         qp_info->recv_queue.max_active = mad_recvq_size;
2916         return 0;
2917
2918 error:
2919         return ret;
2920 }
2921
2922 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2923 {
2924         if (!qp_info->qp)
2925                 return;
2926
2927         ib_destroy_qp(qp_info->qp);
2928 }
2929
2930 /*
2931  * Open the port
2932  * Create the QP, PD, MR, and CQ if needed
2933  */
2934 static int ib_mad_port_open(struct ib_device *device,
2935                             u32 port_num)
2936 {
2937         int ret, cq_size;
2938         struct ib_mad_port_private *port_priv;
2939         unsigned long flags;
2940         char name[sizeof "ib_mad123"];
2941         int has_smi;
2942
2943         if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
2944                 return -EFAULT;
2945
2946         if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
2947                     rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
2948                 return -EFAULT;
2949
2950         /* Create new device info */
2951         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2952         if (!port_priv)
2953                 return -ENOMEM;
2954
2955         port_priv->device = device;
2956         port_priv->port_num = port_num;
2957         spin_lock_init(&port_priv->reg_lock);
2958         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2959         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2960
2961         cq_size = mad_sendq_size + mad_recvq_size;
2962         has_smi = rdma_cap_ib_smi(device, port_num);
2963         if (has_smi)
2964                 cq_size *= 2;
2965
2966         port_priv->pd = ib_alloc_pd(device, 0);
2967         if (IS_ERR(port_priv->pd)) {
2968                 dev_err(&device->dev, "Couldn't create ib_mad PD\n");
2969                 ret = PTR_ERR(port_priv->pd);
2970                 goto error3;
2971         }
2972
2973         port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
2974                         IB_POLL_UNBOUND_WORKQUEUE);
2975         if (IS_ERR(port_priv->cq)) {
2976                 dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
2977                 ret = PTR_ERR(port_priv->cq);
2978                 goto error4;
2979         }
2980
2981         if (has_smi) {
2982                 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2983                 if (ret)
2984                         goto error6;
2985         }
2986         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2987         if (ret)
2988                 goto error7;
2989
2990         snprintf(name, sizeof(name), "ib_mad%u", port_num);
2991         port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
2992         if (!port_priv->wq) {
2993                 ret = -ENOMEM;
2994                 goto error8;
2995         }
2996
2997         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2998         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2999         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3000
3001         ret = ib_mad_port_start(port_priv);
3002         if (ret) {
3003                 dev_err(&device->dev, "Couldn't start port\n");
3004                 goto error9;
3005         }
3006
3007         return 0;
3008
3009 error9:
3010         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3011         list_del_init(&port_priv->port_list);
3012         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3013
3014         destroy_workqueue(port_priv->wq);
3015 error8:
3016         destroy_mad_qp(&port_priv->qp_info[1]);
3017 error7:
3018         destroy_mad_qp(&port_priv->qp_info[0]);
3019 error6:
3020         ib_free_cq(port_priv->cq);
3021         cleanup_recv_queue(&port_priv->qp_info[1]);
3022         cleanup_recv_queue(&port_priv->qp_info[0]);
3023 error4:
3024         ib_dealloc_pd(port_priv->pd);
3025 error3:
3026         kfree(port_priv);
3027
3028         return ret;
3029 }
3030
3031 /*
3032  * Close the port
3033  * If there are no classes using the port, free the port
3034  * resources (CQ, MR, PD, QP) and remove the port's info structure
3035  */
3036 static int ib_mad_port_close(struct ib_device *device, u32 port_num)
3037 {
3038         struct ib_mad_port_private *port_priv;
3039         unsigned long flags;
3040
3041         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
3042         port_priv = __ib_get_mad_port(device, port_num);
3043         if (port_priv == NULL) {
3044                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3045                 dev_err(&device->dev, "Port %u not found\n", port_num);
3046                 return -ENODEV;
3047         }
3048         list_del_init(&port_priv->port_list);
3049         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3050
3051         destroy_workqueue(port_priv->wq);
3052         destroy_mad_qp(&port_priv->qp_info[1]);
3053         destroy_mad_qp(&port_priv->qp_info[0]);
3054         ib_free_cq(port_priv->cq);
3055         ib_dealloc_pd(port_priv->pd);
3056         cleanup_recv_queue(&port_priv->qp_info[1]);
3057         cleanup_recv_queue(&port_priv->qp_info[0]);
3058         /* XXX: Handle deallocation of MAD registration tables */
3059
3060         kfree(port_priv);
3061
3062         return 0;
3063 }
3064
3065 static int ib_mad_init_device(struct ib_device *device)
3066 {
3067         int start, i;
3068         unsigned int count = 0;
3069         int ret;
3070
3071         start = rdma_start_port(device);
3072
3073         for (i = start; i <= rdma_end_port(device); i++) {
3074                 if (!rdma_cap_ib_mad(device, i))
3075                         continue;
3076
3077                 ret = ib_mad_port_open(device, i);
3078                 if (ret) {
3079                         dev_err(&device->dev, "Couldn't open port %d\n", i);
3080                         goto error;
3081                 }
3082                 ret = ib_agent_port_open(device, i);
3083                 if (ret) {
3084                         dev_err(&device->dev,
3085                                 "Couldn't open port %d for agents\n", i);
3086                         goto error_agent;
3087                 }
3088                 count++;
3089         }
3090         if (!count)
3091                 return -EOPNOTSUPP;
3092
3093         return 0;
3094
3095 error_agent:
3096         if (ib_mad_port_close(device, i))
3097                 dev_err(&device->dev, "Couldn't close port %d\n", i);
3098
3099 error:
3100         while (--i >= start) {
3101                 if (!rdma_cap_ib_mad(device, i))
3102                         continue;
3103
3104                 if (ib_agent_port_close(device, i))
3105                         dev_err(&device->dev,
3106                                 "Couldn't close port %d for agents\n", i);
3107                 if (ib_mad_port_close(device, i))
3108                         dev_err(&device->dev, "Couldn't close port %d\n", i);
3109         }
3110         return ret;
3111 }
3112
3113 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
3114 {
3115         unsigned int i;
3116
3117         rdma_for_each_port (device, i) {
3118                 if (!rdma_cap_ib_mad(device, i))
3119                         continue;
3120
3121                 if (ib_agent_port_close(device, i))
3122                         dev_err(&device->dev,
3123                                 "Couldn't close port %u for agents\n", i);
3124                 if (ib_mad_port_close(device, i))
3125                         dev_err(&device->dev, "Couldn't close port %u\n", i);
3126         }
3127 }
3128
3129 static struct ib_client mad_client = {
3130         .name   = "mad",
3131         .add = ib_mad_init_device,
3132         .remove = ib_mad_remove_device
3133 };
3134
3135 int ib_mad_init(void)
3136 {
3137         mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3138         mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3139
3140         mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3141         mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3142
3143         INIT_LIST_HEAD(&ib_mad_port_list);
3144
3145         if (ib_register_client(&mad_client)) {
3146                 pr_err("Couldn't register ib_mad client\n");
3147                 return -EINVAL;
3148         }
3149
3150         return 0;
3151 }
3152
3153 void ib_mad_cleanup(void)
3154 {
3155         ib_unregister_client(&mad_client);
3156 }