drivers/infiniband/core/cm.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2004-2007 Intel Corporation.  All rights reserved.
   4  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   5  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   6  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   7  * Copyright (c) 2019, Mellanox Technologies inc.  All rights reserved.
   8  */
   9
  10 #include <linux/completion.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/device.h>
  13 #include <linux/module.h>
  14 #include <linux/err.h>
  15 #include <linux/idr.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/random.h>
  18 #include <linux/rbtree.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/slab.h>
  21 #include <linux/sysfs.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/etherdevice.h>
  25
  26 #include <rdma/ib_cache.h>
  27 #include <rdma/ib_cm.h>
  28 #include <rdma/ib_sysfs.h>
  29 #include "cm_msgs.h"
  30 #include "core_priv.h"
  31 #include "cm_trace.h"
  32
  33 MODULE_AUTHOR("Sean Hefty");
  34 MODULE_DESCRIPTION("InfiniBand CM");
  35 MODULE_LICENSE("Dual BSD/GPL");
  36
  37 static const char * const ibcm_rej_reason_strs[] = {
  38         [IB_CM_REJ_NO_QP]                       = "no QP",
  39         [IB_CM_REJ_NO_EEC]                      = "no EEC",
  40         [IB_CM_REJ_NO_RESOURCES]                = "no resources",
  41         [IB_CM_REJ_TIMEOUT]                     = "timeout",
  42         [IB_CM_REJ_UNSUPPORTED]                 = "unsupported",
  43         [IB_CM_REJ_INVALID_COMM_ID]             = "invalid comm ID",
  44         [IB_CM_REJ_INVALID_COMM_INSTANCE]       = "invalid comm instance",
  45         [IB_CM_REJ_INVALID_SERVICE_ID]          = "invalid service ID",
  46         [IB_CM_REJ_INVALID_TRANSPORT_TYPE]      = "invalid transport type",
  47         [IB_CM_REJ_STALE_CONN]                  = "stale conn",
  48         [IB_CM_REJ_RDC_NOT_EXIST]               = "RDC not exist",
  49         [IB_CM_REJ_INVALID_GID]                 = "invalid GID",
  50         [IB_CM_REJ_INVALID_LID]                 = "invalid LID",
  51         [IB_CM_REJ_INVALID_SL]                  = "invalid SL",
  52         [IB_CM_REJ_INVALID_TRAFFIC_CLASS]       = "invalid traffic class",
  53         [IB_CM_REJ_INVALID_HOP_LIMIT]           = "invalid hop limit",
  54         [IB_CM_REJ_INVALID_PACKET_RATE]         = "invalid packet rate",
  55         [IB_CM_REJ_INVALID_ALT_GID]             = "invalid alt GID",
  56         [IB_CM_REJ_INVALID_ALT_LID]             = "invalid alt LID",
  57         [IB_CM_REJ_INVALID_ALT_SL]              = "invalid alt SL",
  58         [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS]   = "invalid alt traffic class",
  59         [IB_CM_REJ_INVALID_ALT_HOP_LIMIT]       = "invalid alt hop limit",
  60         [IB_CM_REJ_INVALID_ALT_PACKET_RATE]     = "invalid alt packet rate",
  61         [IB_CM_REJ_PORT_CM_REDIRECT]            = "port CM redirect",
  62         [IB_CM_REJ_PORT_REDIRECT]               = "port redirect",
  63         [IB_CM_REJ_INVALID_MTU]                 = "invalid MTU",
  64         [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
  65         [IB_CM_REJ_CONSUMER_DEFINED]            = "consumer defined",
  66         [IB_CM_REJ_INVALID_RNR_RETRY]           = "invalid RNR retry",
  67         [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID]     = "duplicate local comm ID",
  68         [IB_CM_REJ_INVALID_CLASS_VERSION]       = "invalid class version",
  69         [IB_CM_REJ_INVALID_FLOW_LABEL]          = "invalid flow label",
  70         [IB_CM_REJ_INVALID_ALT_FLOW_LABEL]      = "invalid alt flow label",
  71         [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
  72                 "vendor option is not supported",
  73 };
  74
  75 const char *__attribute_const__ ibcm_reject_msg(int reason)
  76 {
  77         size_t index = reason;
  78
  79         if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
  80             ibcm_rej_reason_strs[index])
  81                 return ibcm_rej_reason_strs[index];
  82         else
  83                 return "unrecognized reason";
  84 }
  85 EXPORT_SYMBOL(ibcm_reject_msg);
  86
  87 struct cm_id_private;
  88 struct cm_work;
  89 static int cm_add_one(struct ib_device *device);
  90 static void cm_remove_one(struct ib_device *device, void *client_data);
  91 static void cm_process_work(struct cm_id_private *cm_id_priv,
  92                             struct cm_work *work);
  93 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
  94                                    struct ib_cm_sidr_rep_param *param);
  95 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
  96                                const void *private_data, u8 private_data_len);
  97 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
  98                                void *private_data, u8 private_data_len);
  99 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
 100                               enum ib_cm_rej_reason reason, void *ari,
 101                               u8 ari_length, const void *private_data,
 102                               u8 private_data_len);
 103
 104 static struct ib_client cm_client = {
 105         .name   = "cm",
 106         .add    = cm_add_one,
 107         .remove = cm_remove_one
 108 };
 109
 110 static struct ib_cm {
 111         spinlock_t lock;
 112         struct list_head device_list;
 113         rwlock_t device_lock;
 114         struct rb_root listen_service_table;
 115         u64 listen_service_id;
 116         /* struct rb_root peer_service_table; todo: fix peer to peer */
 117         struct rb_root remote_qp_table;
 118         struct rb_root remote_id_table;
 119         struct rb_root remote_sidr_table;
 120         struct xarray local_id_table;
 121         u32 local_id_next;
 122         __be32 random_id_operand;
 123         struct list_head timewait_list;
 124         struct workqueue_struct *wq;
 125 } cm;
 126
 127 /* Counter indexes ordered by attribute ID */
 128 enum {
 129         CM_REQ_COUNTER,
 130         CM_MRA_COUNTER,
 131         CM_REJ_COUNTER,
 132         CM_REP_COUNTER,
 133         CM_RTU_COUNTER,
 134         CM_DREQ_COUNTER,
 135         CM_DREP_COUNTER,
 136         CM_SIDR_REQ_COUNTER,
 137         CM_SIDR_REP_COUNTER,
 138         CM_LAP_COUNTER,
 139         CM_APR_COUNTER,
 140         CM_ATTR_COUNT,
 141         CM_ATTR_ID_OFFSET = 0x0010,
 142 };
 143
 144 enum {
 145         CM_XMIT,
 146         CM_XMIT_RETRIES,
 147         CM_RECV,
 148         CM_RECV_DUPLICATES,
 149         CM_COUNTER_GROUPS
 150 };
 151
 152 struct cm_counter_attribute {
 153         struct ib_port_attribute attr;
 154         unsigned short group;
 155         unsigned short index;
 156 };
 157
 158 struct cm_port {
 159         struct cm_device *cm_dev;
 160         struct ib_mad_agent *mad_agent;
 161         u32 port_num;
 162         atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT];
 163 };
 164
 165 struct cm_device {
 166         struct kref kref;
 167         struct list_head list;
 168         spinlock_t mad_agent_lock;
 169         struct ib_device *ib_device;
 170         u8 ack_delay;
 171         int going_down;
 172         struct cm_port *port[];
 173 };
 174
 175 struct cm_av {
 176         struct cm_port *port;
 177         struct rdma_ah_attr ah_attr;
 178         u16 pkey_index;
 179         u8 timeout;
 180 };
 181
 182 struct cm_work {
 183         struct delayed_work work;
 184         struct list_head list;
 185         struct cm_port *port;
 186         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 187         __be32 local_id;                        /* Established / timewait */
 188         __be32 remote_id;
 189         struct ib_cm_event cm_event;
 190         struct sa_path_rec path[];
 191 };
 192
 193 struct cm_timewait_info {
 194         struct cm_work work;
 195         struct list_head list;
 196         struct rb_node remote_qp_node;
 197         struct rb_node remote_id_node;
 198         __be64 remote_ca_guid;
 199         __be32 remote_qpn;
 200         u8 inserted_remote_qp;
 201         u8 inserted_remote_id;
 202 };
 203
 204 struct cm_id_private {
 205         struct ib_cm_id id;
 206
 207         struct rb_node service_node;
 208         struct rb_node sidr_id_node;
 209         u32 sidr_slid;
 210         spinlock_t lock;        /* Do not acquire inside cm.lock */
 211         struct completion comp;
 212         refcount_t refcount;
 213         /* Number of clients sharing this ib_cm_id. Only valid for listeners.
 214          * Protected by the cm.lock spinlock.
 215          */
 216         int listen_sharecount;
 217         struct rcu_head rcu;
 218
 219         struct ib_mad_send_buf *msg;
 220         struct cm_timewait_info *timewait_info;
 221         /* todo: use alternate port on send failure */
 222         struct cm_av av;
 223         struct cm_av alt_av;
 224
 225         void *private_data;
 226         __be64 tid;
 227         __be32 local_qpn;
 228         __be32 remote_qpn;
 229         enum ib_qp_type qp_type;
 230         __be32 sq_psn;
 231         __be32 rq_psn;
 232         int timeout_ms;
 233         enum ib_mtu path_mtu;
 234         __be16 pkey;
 235         u8 private_data_len;
 236         u8 max_cm_retries;
 237         u8 responder_resources;
 238         u8 initiator_depth;
 239         u8 retry_count;
 240         u8 rnr_retry_count;
 241         u8 service_timeout;
 242         u8 target_ack_delay;
 243
 244         struct list_head work_list;
 245         atomic_t work_count;
 246
 247         struct rdma_ucm_ece ece;
 248 };
 249
 250 static void cm_dev_release(struct kref *kref)
 251 {
 252         struct cm_device *cm_dev = container_of(kref, struct cm_device, kref);
 253         u32 i;
 254
 255         rdma_for_each_port(cm_dev->ib_device, i)
 256                 kfree(cm_dev->port[i - 1]);
 257
 258         kfree(cm_dev);
 259 }
 260
 261 static void cm_device_put(struct cm_device *cm_dev)
 262 {
 263         kref_put(&cm_dev->kref, cm_dev_release);
 264 }
 265
 266 static void cm_work_handler(struct work_struct *work);
 267
 268 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 269 {
 270         if (refcount_dec_and_test(&cm_id_priv->refcount))
 271                 complete(&cm_id_priv->comp);
 272 }
 273
 274 static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv)
 275 {
 276         struct ib_mad_agent *mad_agent;
 277         struct ib_mad_send_buf *m;
 278         struct ib_ah *ah;
 279
 280         lockdep_assert_held(&cm_id_priv->lock);
 281
 282         if (!cm_id_priv->av.port)
 283                 return ERR_PTR(-EINVAL);
 284
 285         spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
 286         mad_agent = cm_id_priv->av.port->mad_agent;
 287         if (!mad_agent) {
 288                 m = ERR_PTR(-EINVAL);
 289                 goto out;
 290         }
 291
 292         ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0);
 293         if (IS_ERR(ah)) {
 294                 m = ERR_CAST(ah);
 295                 goto out;
 296         }
 297
 298         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 299                                cm_id_priv->av.pkey_index,
 300                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 301                                GFP_ATOMIC,
 302                                IB_MGMT_BASE_VERSION);
 303         if (IS_ERR(m)) {
 304                 rdma_destroy_ah(ah, 0);
 305                 goto out;
 306         }
 307
 308         /* Timeout set by caller if response is expected. */
 309         m->ah = ah;
 310         m->retries = cm_id_priv->max_cm_retries;
 311
 312         refcount_inc(&cm_id_priv->refcount);
 313         m->context[0] = cm_id_priv;
 314
 315 out:
 316         spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
 317         return m;
 318 }
 319
 320 static void cm_free_msg(struct ib_mad_send_buf *msg)
 321 {
 322         struct cm_id_private *cm_id_priv = msg->context[0];
 323
 324         if (msg->ah)
 325                 rdma_destroy_ah(msg->ah, 0);
 326         cm_deref_id(cm_id_priv);
 327         ib_free_send_mad(msg);
 328 }
 329
 330 static struct ib_mad_send_buf *
 331 cm_alloc_priv_msg(struct cm_id_private *cm_id_priv)
 332 {
 333         struct ib_mad_send_buf *msg;
 334
 335         lockdep_assert_held(&cm_id_priv->lock);
 336
 337         msg = cm_alloc_msg(cm_id_priv);
 338         if (IS_ERR(msg))
 339                 return msg;
 340         cm_id_priv->msg = msg;
 341         return msg;
 342 }
 343
 344 static void cm_free_priv_msg(struct ib_mad_send_buf *msg)
 345 {
 346         struct cm_id_private *cm_id_priv = msg->context[0];
 347
 348         lockdep_assert_held(&cm_id_priv->lock);
 349
 350         if (!WARN_ON(cm_id_priv->msg != msg))
 351                 cm_id_priv->msg = NULL;
 352
 353         if (msg->ah)
 354                 rdma_destroy_ah(msg->ah, 0);
 355         cm_deref_id(cm_id_priv);
 356         ib_free_send_mad(msg);
 357 }
 358
 359 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
 360                                                            struct ib_mad_recv_wc *mad_recv_wc)
 361 {
 362         return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 363                                   0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 364                                   GFP_ATOMIC,
 365                                   IB_MGMT_BASE_VERSION);
 366 }
 367
 368 static int cm_create_response_msg_ah(struct cm_port *port,
 369                                      struct ib_mad_recv_wc *mad_recv_wc,
 370                                      struct ib_mad_send_buf *msg)
 371 {
 372         struct ib_ah *ah;
 373
 374         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 375                                   mad_recv_wc->recv_buf.grh, port->port_num);
 376         if (IS_ERR(ah))
 377                 return PTR_ERR(ah);
 378
 379         msg->ah = ah;
 380         return 0;
 381 }
 382
 383 static int cm_alloc_response_msg(struct cm_port *port,
 384                                  struct ib_mad_recv_wc *mad_recv_wc,
 385                                  struct ib_mad_send_buf **msg)
 386 {
 387         struct ib_mad_send_buf *m;
 388         int ret;
 389
 390         m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
 391         if (IS_ERR(m))
 392                 return PTR_ERR(m);
 393
 394         ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
 395         if (ret) {
 396                 ib_free_send_mad(m);
 397                 return ret;
 398         }
 399
 400         *msg = m;
 401         return 0;
 402 }
 403
 404 static void cm_free_response_msg(struct ib_mad_send_buf *msg)
 405 {
 406         if (msg->ah)
 407                 rdma_destroy_ah(msg->ah, 0);
 408         ib_free_send_mad(msg);
 409 }
 410
 411 static void *cm_copy_private_data(const void *private_data, u8 private_data_len)
 412 {
 413         void *data;
 414
 415         if (!private_data || !private_data_len)
 416                 return NULL;
 417
 418         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 419         if (!data)
 420                 return ERR_PTR(-ENOMEM);
 421
 422         return data;
 423 }
 424
 425 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 426                                  void *private_data, u8 private_data_len)
 427 {
 428         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 429                 kfree(cm_id_priv->private_data);
 430
 431         cm_id_priv->private_data = private_data;
 432         cm_id_priv->private_data_len = private_data_len;
 433 }
 434
 435 static void cm_set_av_port(struct cm_av *av, struct cm_port *port)
 436 {
 437         struct cm_port *old_port = av->port;
 438
 439         if (old_port == port)
 440                 return;
 441
 442         av->port = port;
 443         if (old_port)
 444                 cm_device_put(old_port->cm_dev);
 445         if (port)
 446                 kref_get(&port->cm_dev->kref);
 447 }
 448
 449 static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
 450                                struct rdma_ah_attr *ah_attr, struct cm_av *av)
 451 {
 452         cm_set_av_port(av, port);
 453         av->pkey_index = wc->pkey_index;
 454         rdma_move_ah_attr(&av->ah_attr, ah_attr);
 455 }
 456
 457 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 458                                    struct ib_grh *grh, struct cm_av *av)
 459 {
 460         cm_set_av_port(av, port);
 461         av->pkey_index = wc->pkey_index;
 462         return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
 463                                        port->port_num, wc,
 464                                        grh, &av->ah_attr);
 465 }
 466
 467 static struct cm_port *
 468 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
 469 {
 470         struct cm_device *cm_dev;
 471         struct cm_port *port = NULL;
 472         unsigned long flags;
 473
 474         if (attr) {
 475                 read_lock_irqsave(&cm.device_lock, flags);
 476                 list_for_each_entry(cm_dev, &cm.device_list, list) {
 477                         if (cm_dev->ib_device == attr->device) {
 478                                 port = cm_dev->port[attr->port_num - 1];
 479                                 break;
 480                         }
 481                 }
 482                 read_unlock_irqrestore(&cm.device_lock, flags);
 483         } else {
 484                 /* SGID attribute can be NULL in following
 485                  * conditions.
 486                  * (a) Alternative path
 487                  * (b) IB link layer without GRH
 488                  * (c) LAP send messages
 489                  */
 490                 read_lock_irqsave(&cm.device_lock, flags);
 491                 list_for_each_entry(cm_dev, &cm.device_list, list) {
 492                         attr = rdma_find_gid(cm_dev->ib_device,
 493                                              &path->sgid,
 494                                              sa_conv_pathrec_to_gid_type(path),
 495                                              NULL);
 496                         if (!IS_ERR(attr)) {
 497                                 port = cm_dev->port[attr->port_num - 1];
 498                                 break;
 499                         }
 500                 }
 501                 read_unlock_irqrestore(&cm.device_lock, flags);
 502                 if (port)
 503                         rdma_put_gid_attr(attr);
 504         }
 505         return port;
 506 }
 507
 508 static int cm_init_av_by_path(struct sa_path_rec *path,
 509                               const struct ib_gid_attr *sgid_attr,
 510                               struct cm_av *av)
 511 {
 512         struct rdma_ah_attr new_ah_attr;
 513         struct cm_device *cm_dev;
 514         struct cm_port *port;
 515         int ret;
 516
 517         port = get_cm_port_from_path(path, sgid_attr);
 518         if (!port)
 519                 return -EINVAL;
 520         cm_dev = port->cm_dev;
 521
 522         ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
 523                                   be16_to_cpu(path->pkey), &av->pkey_index);
 524         if (ret)
 525                 return ret;
 526
 527         cm_set_av_port(av, port);
 528
 529         /*
 530          * av->ah_attr might be initialized based on wc or during
 531          * request processing time which might have reference to sgid_attr.
 532          * So initialize a new ah_attr on stack.
 533          * If initialization fails, old ah_attr is used for sending any
 534          * responses. If initialization is successful, than new ah_attr
 535          * is used by overwriting the old one. So that right ah_attr
 536          * can be used to return an error response.
 537          */
 538         ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
 539                                         &new_ah_attr, sgid_attr);
 540         if (ret)
 541                 return ret;
 542
 543         av->timeout = path->packet_life_time + 1;
 544         rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
 545         return 0;
 546 }
 547
 548 /* Move av created by cm_init_av_by_path(), so av.dgid is not moved */
 549 static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src)
 550 {
 551         cm_set_av_port(dest, src->port);
 552         cm_set_av_port(src, NULL);
 553         dest->pkey_index = src->pkey_index;
 554         rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr);
 555         dest->timeout = src->timeout;
 556 }
 557
 558 static void cm_destroy_av(struct cm_av *av)
 559 {
 560         rdma_destroy_ah_attr(&av->ah_attr);
 561         cm_set_av_port(av, NULL);
 562 }
 563
 564 static u32 cm_local_id(__be32 local_id)
 565 {
 566         return (__force u32) (local_id ^ cm.random_id_operand);
 567 }
 568
 569 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
 570 {
 571         struct cm_id_private *cm_id_priv;
 572
 573         rcu_read_lock();
 574         cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
 575         if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
 576             !refcount_inc_not_zero(&cm_id_priv->refcount))
 577                 cm_id_priv = NULL;
 578         rcu_read_unlock();
 579
 580         return cm_id_priv;
 581 }
 582
 583 /*
 584  * Trivial helpers to strip endian annotation and compare; the
 585  * endianness doesn't actually matter since we just need a stable
 586  * order for the RB tree.
 587  */
 588 static int be32_lt(__be32 a, __be32 b)
 589 {
 590         return (__force u32) a < (__force u32) b;
 591 }
 592
 593 static int be32_gt(__be32 a, __be32 b)
 594 {
 595         return (__force u32) a > (__force u32) b;
 596 }
 597
 598 static int be64_lt(__be64 a, __be64 b)
 599 {
 600         return (__force u64) a < (__force u64) b;
 601 }
 602
 603 static int be64_gt(__be64 a, __be64 b)
 604 {
 605         return (__force u64) a > (__force u64) b;
 606 }
 607
 608 /*
 609  * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
 610  * if the new ID was inserted, NULL if it could not be inserted due to a
 611  * collision, or the existing cm_id_priv ready for shared usage.
 612  */
 613 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
 614                                               ib_cm_handler shared_handler)
 615 {
 616         struct rb_node **link = &cm.listen_service_table.rb_node;
 617         struct rb_node *parent = NULL;
 618         struct cm_id_private *cur_cm_id_priv;
 619         __be64 service_id = cm_id_priv->id.service_id;
 620         __be64 service_mask = cm_id_priv->id.service_mask;
 621         unsigned long flags;
 622
 623         spin_lock_irqsave(&cm.lock, flags);
 624         while (*link) {
 625                 parent = *link;
 626                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 627                                           service_node);
 628                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 629                     (service_mask & cur_cm_id_priv->id.service_id) &&
 630                     (cm_id_priv->id.device == cur_cm_id_priv->id.device)) {
 631                         /*
 632                          * Sharing an ib_cm_id with different handlers is not
 633                          * supported
 634                          */
 635                         if (cur_cm_id_priv->id.cm_handler != shared_handler ||
 636                             cur_cm_id_priv->id.context ||
 637                             WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
 638                                 spin_unlock_irqrestore(&cm.lock, flags);
 639                                 return NULL;
 640                         }
 641                         refcount_inc(&cur_cm_id_priv->refcount);
 642                         cur_cm_id_priv->listen_sharecount++;
 643                         spin_unlock_irqrestore(&cm.lock, flags);
 644                         return cur_cm_id_priv;
 645                 }
 646
 647                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 648                         link = &(*link)->rb_left;
 649                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 650                         link = &(*link)->rb_right;
 651                 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
 652                         link = &(*link)->rb_left;
 653                 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
 654                         link = &(*link)->rb_right;
 655                 else
 656                         link = &(*link)->rb_right;
 657         }
 658         cm_id_priv->listen_sharecount++;
 659         rb_link_node(&cm_id_priv->service_node, parent, link);
 660         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 661         spin_unlock_irqrestore(&cm.lock, flags);
 662         return cm_id_priv;
 663 }
 664
 665 static struct cm_id_private *cm_find_listen(struct ib_device *device,
 666                                             __be64 service_id)
 667 {
 668         struct rb_node *node = cm.listen_service_table.rb_node;
 669         struct cm_id_private *cm_id_priv;
 670
 671         while (node) {
 672                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 673                 if ((cm_id_priv->id.service_mask & service_id) ==
 674                      cm_id_priv->id.service_id &&
 675                     (cm_id_priv->id.device == device)) {
 676                         refcount_inc(&cm_id_priv->refcount);
 677                         return cm_id_priv;
 678                 }
 679                 if (device < cm_id_priv->id.device)
 680                         node = node->rb_left;
 681                 else if (device > cm_id_priv->id.device)
 682                         node = node->rb_right;
 683                 else if (be64_lt(service_id, cm_id_priv->id.service_id))
 684                         node = node->rb_left;
 685                 else if (be64_gt(service_id, cm_id_priv->id.service_id))
 686                         node = node->rb_right;
 687                 else
 688                         node = node->rb_right;
 689         }
 690         return NULL;
 691 }
 692
 693 static struct cm_timewait_info *
 694 cm_insert_remote_id(struct cm_timewait_info *timewait_info)
 695 {
 696         struct rb_node **link = &cm.remote_id_table.rb_node;
 697         struct rb_node *parent = NULL;
 698         struct cm_timewait_info *cur_timewait_info;
 699         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 700         __be32 remote_id = timewait_info->work.remote_id;
 701
 702         while (*link) {
 703                 parent = *link;
 704                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 705                                              remote_id_node);
 706                 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
 707                         link = &(*link)->rb_left;
 708                 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
 709                         link = &(*link)->rb_right;
 710                 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 711                         link = &(*link)->rb_left;
 712                 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 713                         link = &(*link)->rb_right;
 714                 else
 715                         return cur_timewait_info;
 716         }
 717         timewait_info->inserted_remote_id = 1;
 718         rb_link_node(&timewait_info->remote_id_node, parent, link);
 719         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 720         return NULL;
 721 }
 722
 723 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
 724                                                __be32 remote_id)
 725 {
 726         struct rb_node *node = cm.remote_id_table.rb_node;
 727         struct cm_timewait_info *timewait_info;
 728         struct cm_id_private *res = NULL;
 729
 730         spin_lock_irq(&cm.lock);
 731         while (node) {
 732                 timewait_info = rb_entry(node, struct cm_timewait_info,
 733                                          remote_id_node);
 734                 if (be32_lt(remote_id, timewait_info->work.remote_id))
 735                         node = node->rb_left;
 736                 else if (be32_gt(remote_id, timewait_info->work.remote_id))
 737                         node = node->rb_right;
 738                 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
 739                         node = node->rb_left;
 740                 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
 741                         node = node->rb_right;
 742                 else {
 743                         res = cm_acquire_id(timewait_info->work.local_id,
 744                                              timewait_info->work.remote_id);
 745                         break;
 746                 }
 747         }
 748         spin_unlock_irq(&cm.lock);
 749         return res;
 750 }
 751
 752 static struct cm_timewait_info *
 753 cm_insert_remote_qpn(struct cm_timewait_info *timewait_info)
 754 {
 755         struct rb_node **link = &cm.remote_qp_table.rb_node;
 756         struct rb_node *parent = NULL;
 757         struct cm_timewait_info *cur_timewait_info;
 758         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 759         __be32 remote_qpn = timewait_info->remote_qpn;
 760
 761         while (*link) {
 762                 parent = *link;
 763                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 764                                              remote_qp_node);
 765                 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
 766                         link = &(*link)->rb_left;
 767                 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
 768                         link = &(*link)->rb_right;
 769                 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 770                         link = &(*link)->rb_left;
 771                 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 772                         link = &(*link)->rb_right;
 773                 else
 774                         return cur_timewait_info;
 775         }
 776         timewait_info->inserted_remote_qp = 1;
 777         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 778         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 779         return NULL;
 780 }
 781
 782 static struct cm_id_private *
 783 cm_insert_remote_sidr(struct cm_id_private *cm_id_priv)
 784 {
 785         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 786         struct rb_node *parent = NULL;
 787         struct cm_id_private *cur_cm_id_priv;
 788         __be32 remote_id = cm_id_priv->id.remote_id;
 789
 790         while (*link) {
 791                 parent = *link;
 792                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 793                                           sidr_id_node);
 794                 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
 795                         link = &(*link)->rb_left;
 796                 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
 797                         link = &(*link)->rb_right;
 798                 else {
 799                         if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid)
 800                                 link = &(*link)->rb_left;
 801                         else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid)
 802                                 link = &(*link)->rb_right;
 803                         else
 804                                 return cur_cm_id_priv;
 805                 }
 806         }
 807         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 808         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 809         return NULL;
 810 }
 811
 812 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
 813                                               ib_cm_handler cm_handler,
 814                                               void *context)
 815 {
 816         struct cm_id_private *cm_id_priv;
 817         u32 id;
 818         int ret;
 819
 820         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 821         if (!cm_id_priv)
 822                 return ERR_PTR(-ENOMEM);
 823
 824         cm_id_priv->id.state = IB_CM_IDLE;
 825         cm_id_priv->id.device = device;
 826         cm_id_priv->id.cm_handler = cm_handler;
 827         cm_id_priv->id.context = context;
 828         cm_id_priv->id.remote_cm_qpn = 1;
 829
 830         RB_CLEAR_NODE(&cm_id_priv->service_node);
 831         RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
 832         spin_lock_init(&cm_id_priv->lock);
 833         init_completion(&cm_id_priv->comp);
 834         INIT_LIST_HEAD(&cm_id_priv->work_list);
 835         atomic_set(&cm_id_priv->work_count, -1);
 836         refcount_set(&cm_id_priv->refcount, 1);
 837
 838         ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b,
 839                               &cm.local_id_next, GFP_KERNEL);
 840         if (ret < 0)
 841                 goto error;
 842         cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
 843
 844         return cm_id_priv;
 845
 846 error:
 847         kfree(cm_id_priv);
 848         return ERR_PTR(ret);
 849 }
 850
 851 /*
 852  * Make the ID visible to the MAD handlers and other threads that use the
 853  * xarray.
 854  */
 855 static void cm_finalize_id(struct cm_id_private *cm_id_priv)
 856 {
 857         xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
 858                  cm_id_priv, GFP_ATOMIC);
 859 }
 860
 861 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 862                                  ib_cm_handler cm_handler,
 863                                  void *context)
 864 {
 865         struct cm_id_private *cm_id_priv;
 866
 867         cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
 868         if (IS_ERR(cm_id_priv))
 869                 return ERR_CAST(cm_id_priv);
 870
 871         cm_finalize_id(cm_id_priv);
 872         return &cm_id_priv->id;
 873 }
 874 EXPORT_SYMBOL(ib_create_cm_id);
 875
 876 static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv)
 877 {
 878         struct cm_work *work;
 879
 880         if (list_empty(&cm_id_priv->work_list))
 881                 return NULL;
 882
 883         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 884         list_del(&work->list);
 885         return work;
 886 }
 887
 888 static void cm_free_work(struct cm_work *work)
 889 {
 890         if (work->mad_recv_wc)
 891                 ib_free_recv_mad(work->mad_recv_wc);
 892         kfree(work);
 893 }
 894
 895 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
 896                                  struct cm_work *work)
 897         __releases(&cm_id_priv->lock)
 898 {
 899         bool immediate;
 900
 901         /*
 902          * To deliver the event to the user callback we have the drop the
 903          * spinlock, however, we need to ensure that the user callback is single
 904          * threaded and receives events in the temporal order. If there are
 905          * already events being processed then thread new events onto a list,
 906          * the thread currently processing will pick them up.
 907          */
 908         immediate = atomic_inc_and_test(&cm_id_priv->work_count);
 909         if (!immediate) {
 910                 list_add_tail(&work->list, &cm_id_priv->work_list);
 911                 /*
 912                  * This routine always consumes incoming reference. Once queued
 913                  * to the work_list then a reference is held by the thread
 914                  * currently running cm_process_work() and this reference is not
 915                  * needed.
 916                  */
 917                 cm_deref_id(cm_id_priv);
 918         }
 919         spin_unlock_irq(&cm_id_priv->lock);
 920
 921         if (immediate)
 922                 cm_process_work(cm_id_priv, work);
 923 }
 924
 925 static inline int cm_convert_to_ms(int iba_time)
 926 {
 927         /* approximate conversion to ms from 4.096us x 2^iba_time */
 928         return 1 << max(iba_time - 8, 0);
 929 }
 930
 931 /*
 932  * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
 933  * Because of how ack_timeout is stored, adding one doubles the timeout.
 934  * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
 935  * increment it (round up) only if the other is within 50%.
 936  */
 937 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
 938 {
 939         int ack_timeout = packet_life_time + 1;
 940
 941         if (ack_timeout >= ca_ack_delay)
 942                 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
 943         else
 944                 ack_timeout = ca_ack_delay +
 945                               (ack_timeout >= (ca_ack_delay - 1));
 946
 947         return min(31, ack_timeout);
 948 }
 949
 950 static void cm_remove_remote(struct cm_id_private *cm_id_priv)
 951 {
 952         struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
 953
 954         if (timewait_info->inserted_remote_id) {
 955                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 956                 timewait_info->inserted_remote_id = 0;
 957         }
 958
 959         if (timewait_info->inserted_remote_qp) {
 960                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 961                 timewait_info->inserted_remote_qp = 0;
 962         }
 963 }
 964
 965 static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id)
 966 {
 967         struct cm_timewait_info *timewait_info;
 968
 969         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 970         if (!timewait_info)
 971                 return ERR_PTR(-ENOMEM);
 972
 973         timewait_info->work.local_id = local_id;
 974         INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
 975         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 976         return timewait_info;
 977 }
 978
 979 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 980 {
 981         int wait_time;
 982         unsigned long flags;
 983         struct cm_device *cm_dev;
 984
 985         lockdep_assert_held(&cm_id_priv->lock);
 986
 987         cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
 988         if (!cm_dev)
 989                 return;
 990
 991         spin_lock_irqsave(&cm.lock, flags);
 992         cm_remove_remote(cm_id_priv);
 993         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
 994         spin_unlock_irqrestore(&cm.lock, flags);
 995
 996         /*
 997          * The cm_id could be destroyed by the user before we exit timewait.
 998          * To protect against this, we search for the cm_id after exiting
 999          * timewait before notifying the user that we've exited timewait.
1000          */
1001         cm_id_priv->id.state = IB_CM_TIMEWAIT;
1002         wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
1003
1004         /* Check if the device started its remove_one */
1005         spin_lock_irqsave(&cm.lock, flags);
1006         if (!cm_dev->going_down)
1007                 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
1008                                    msecs_to_jiffies(wait_time));
1009         spin_unlock_irqrestore(&cm.lock, flags);
1010
1011         /*
1012          * The timewait_info is converted into a work and gets freed during
1013          * cm_free_work() in cm_timewait_handler().
1014          */
1015         BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1016         cm_id_priv->timewait_info = NULL;
1017 }
1018
1019 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1020 {
1021         unsigned long flags;
1022
1023         lockdep_assert_held(&cm_id_priv->lock);
1024
1025         cm_id_priv->id.state = IB_CM_IDLE;
1026         if (cm_id_priv->timewait_info) {
1027                 spin_lock_irqsave(&cm.lock, flags);
1028                 cm_remove_remote(cm_id_priv);
1029                 spin_unlock_irqrestore(&cm.lock, flags);
1030                 kfree(cm_id_priv->timewait_info);
1031                 cm_id_priv->timewait_info = NULL;
1032         }
1033 }
1034
1035 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1036 {
1037         struct cm_id_private *cm_id_priv;
1038         struct cm_work *work;
1039
1040         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1041         spin_lock_irq(&cm_id_priv->lock);
1042 retest:
1043         switch (cm_id->state) {
1044         case IB_CM_LISTEN:
1045                 spin_lock(&cm.lock);
1046                 if (--cm_id_priv->listen_sharecount > 0) {
1047                         /* The id is still shared. */
1048                         WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1049                         spin_unlock(&cm.lock);
1050                         spin_unlock_irq(&cm_id_priv->lock);
1051                         cm_deref_id(cm_id_priv);
1052                         return;
1053                 }
1054                 cm_id->state = IB_CM_IDLE;
1055                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1056                 RB_CLEAR_NODE(&cm_id_priv->service_node);
1057                 spin_unlock(&cm.lock);
1058                 break;
1059         case IB_CM_SIDR_REQ_SENT:
1060                 cm_id->state = IB_CM_IDLE;
1061                 ib_cancel_mad(cm_id_priv->msg);
1062                 break;
1063         case IB_CM_SIDR_REQ_RCVD:
1064                 cm_send_sidr_rep_locked(cm_id_priv,
1065                                         &(struct ib_cm_sidr_rep_param){
1066                                                 .status = IB_SIDR_REJECT });
1067                 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1068                 cm_id->state = IB_CM_IDLE;
1069                 break;
1070         case IB_CM_REQ_SENT:
1071         case IB_CM_MRA_REQ_RCVD:
1072                 ib_cancel_mad(cm_id_priv->msg);
1073                 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT,
1074                                    &cm_id_priv->id.device->node_guid,
1075                                    sizeof(cm_id_priv->id.device->node_guid),
1076                                    NULL, 0);
1077                 break;
1078         case IB_CM_REQ_RCVD:
1079                 if (err == -ENOMEM) {
1080                         /* Do not reject to allow future retries. */
1081                         cm_reset_to_idle(cm_id_priv);
1082                 } else {
1083                         cm_send_rej_locked(cm_id_priv,
1084                                            IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
1085                                            NULL, 0);
1086                 }
1087                 break;
1088         case IB_CM_REP_SENT:
1089         case IB_CM_MRA_REP_RCVD:
1090                 ib_cancel_mad(cm_id_priv->msg);
1091                 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1092                                    0, NULL, 0);
1093                 goto retest;
1094         case IB_CM_MRA_REQ_SENT:
1095         case IB_CM_REP_RCVD:
1096         case IB_CM_MRA_REP_SENT:
1097                 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1098                                    0, NULL, 0);
1099                 break;
1100         case IB_CM_ESTABLISHED:
1101                 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1102                         cm_id->state = IB_CM_IDLE;
1103                         break;
1104                 }
1105                 cm_send_dreq_locked(cm_id_priv, NULL, 0);
1106                 goto retest;
1107         case IB_CM_DREQ_SENT:
1108                 ib_cancel_mad(cm_id_priv->msg);
1109                 cm_enter_timewait(cm_id_priv);
1110                 goto retest;
1111         case IB_CM_DREQ_RCVD:
1112                 cm_send_drep_locked(cm_id_priv, NULL, 0);
1113                 WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1114                 goto retest;
1115         case IB_CM_TIMEWAIT:
1116                 /*
1117                  * The cm_acquire_id in cm_timewait_handler will stop working
1118                  * once we do xa_erase below, so just move to idle here for
1119                  * consistency.
1120                  */
1121                 cm_id->state = IB_CM_IDLE;
1122                 break;
1123         case IB_CM_IDLE:
1124                 break;
1125         }
1126         WARN_ON(cm_id->state != IB_CM_IDLE);
1127
1128         spin_lock(&cm.lock);
1129         /* Required for cleanup paths related cm_req_handler() */
1130         if (cm_id_priv->timewait_info) {
1131                 cm_remove_remote(cm_id_priv);
1132                 kfree(cm_id_priv->timewait_info);
1133                 cm_id_priv->timewait_info = NULL;
1134         }
1135
1136         WARN_ON(cm_id_priv->listen_sharecount);
1137         WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1138         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1139                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1140         spin_unlock(&cm.lock);
1141         spin_unlock_irq(&cm_id_priv->lock);
1142
1143         xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id));
1144         cm_deref_id(cm_id_priv);
1145         wait_for_completion(&cm_id_priv->comp);
1146         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1147                 cm_free_work(work);
1148
1149         cm_destroy_av(&cm_id_priv->av);
1150         cm_destroy_av(&cm_id_priv->alt_av);
1151         kfree(cm_id_priv->private_data);
1152         kfree_rcu(cm_id_priv, rcu);
1153 }
1154
1155 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1156 {
1157         cm_destroy_id(cm_id, 0);
1158 }
1159 EXPORT_SYMBOL(ib_destroy_cm_id);
1160
1161 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id,
1162                           __be64 service_mask)
1163 {
1164         service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1165         service_id &= service_mask;
1166         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1167             (service_id != IB_CM_ASSIGN_SERVICE_ID))
1168                 return -EINVAL;
1169
1170         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1171                 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1172                 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1173         } else {
1174                 cm_id_priv->id.service_id = service_id;
1175                 cm_id_priv->id.service_mask = service_mask;
1176         }
1177         return 0;
1178 }
1179
1180 /**
1181  * ib_cm_listen - Initiates listening on the specified service ID for
1182  *   connection and service ID resolution requests.
1183  * @cm_id: Connection identifier associated with the listen request.
1184  * @service_id: Service identifier matched against incoming connection
1185  *   and service ID resolution requests.  The service ID should be specified
1186  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1187  *   assign a service ID to the caller.
1188  * @service_mask: Mask applied to service ID used to listen across a
1189  *   range of service IDs.  If set to 0, the service ID is matched
1190  *   exactly.  This parameter is ignored if %service_id is set to
1191  *   IB_CM_ASSIGN_SERVICE_ID.
1192  */
1193 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1194 {
1195         struct cm_id_private *cm_id_priv =
1196                 container_of(cm_id, struct cm_id_private, id);
1197         unsigned long flags;
1198         int ret;
1199
1200         spin_lock_irqsave(&cm_id_priv->lock, flags);
1201         if (cm_id_priv->id.state != IB_CM_IDLE) {
1202                 ret = -EINVAL;
1203                 goto out;
1204         }
1205
1206         ret = cm_init_listen(cm_id_priv, service_id, service_mask);
1207         if (ret)
1208                 goto out;
1209
1210         if (!cm_insert_listen(cm_id_priv, NULL)) {
1211                 ret = -EBUSY;
1212                 goto out;
1213         }
1214
1215         cm_id_priv->id.state = IB_CM_LISTEN;
1216         ret = 0;
1217
1218 out:
1219         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1220         return ret;
1221 }
1222 EXPORT_SYMBOL(ib_cm_listen);
1223
1224 /**
1225  * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on
1226  *                       the given service ID.
1227  *
1228  * If there's an existing ID listening on that same device and service ID,
1229  * return it.
1230  *
1231  * @device: Device associated with the cm_id.  All related communication will
1232  * be associated with the specified device.
1233  * @cm_handler: Callback invoked to notify the user of CM events.
1234  * @service_id: Service identifier matched against incoming connection
1235  *   and service ID resolution requests.  The service ID should be specified
1236  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1237  *   assign a service ID to the caller.
1238  *
1239  * Callers should call ib_destroy_cm_id when done with the listener ID.
1240  */
1241 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1242                                      ib_cm_handler cm_handler,
1243                                      __be64 service_id)
1244 {
1245         struct cm_id_private *listen_id_priv;
1246         struct cm_id_private *cm_id_priv;
1247         int err = 0;
1248
1249         /* Create an ID in advance, since the creation may sleep */
1250         cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1251         if (IS_ERR(cm_id_priv))
1252                 return ERR_CAST(cm_id_priv);
1253
1254         err = cm_init_listen(cm_id_priv, service_id, 0);
1255         if (err) {
1256                 ib_destroy_cm_id(&cm_id_priv->id);
1257                 return ERR_PTR(err);
1258         }
1259
1260         spin_lock_irq(&cm_id_priv->lock);
1261         listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1262         if (listen_id_priv != cm_id_priv) {
1263                 spin_unlock_irq(&cm_id_priv->lock);
1264                 ib_destroy_cm_id(&cm_id_priv->id);
1265                 if (!listen_id_priv)
1266                         return ERR_PTR(-EINVAL);
1267                 return &listen_id_priv->id;
1268         }
1269         cm_id_priv->id.state = IB_CM_LISTEN;
1270         spin_unlock_irq(&cm_id_priv->lock);
1271
1272         /*
1273          * A listen ID does not need to be in the xarray since it does not
1274          * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1275          * and does not enter timewait.
1276          */
1277
1278         return &cm_id_priv->id;
1279 }
1280 EXPORT_SYMBOL(ib_cm_insert_listen);
1281
1282 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1283 {
1284         u64 hi_tid = 0, low_tid;
1285
1286         lockdep_assert_held(&cm_id_priv->lock);
1287
1288         low_tid = (u64)cm_id_priv->id.local_id;
1289         if (!cm_id_priv->av.port)
1290                 return cpu_to_be64(low_tid);
1291
1292         spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1293         if (cm_id_priv->av.port->mad_agent)
1294                 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1295         spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1296         return cpu_to_be64(hi_tid | low_tid);
1297 }
1298
1299 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1300                               __be16 attr_id, __be64 tid)
1301 {
1302         hdr->base_version  = IB_MGMT_BASE_VERSION;
1303         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
1304         hdr->class_version = IB_CM_CLASS_VERSION;
1305         hdr->method        = IB_MGMT_METHOD_SEND;
1306         hdr->attr_id       = attr_id;
1307         hdr->tid           = tid;
1308 }
1309
1310 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1311                                   __be64 tid, u32 attr_mod)
1312 {
1313         cm_format_mad_hdr(hdr, attr_id, tid);
1314         hdr->attr_mod = cpu_to_be32(attr_mod);
1315 }
1316
1317 static void cm_format_req(struct cm_req_msg *req_msg,
1318                           struct cm_id_private *cm_id_priv,
1319                           struct ib_cm_req_param *param)
1320 {
1321         struct sa_path_rec *pri_path = param->primary_path;
1322         struct sa_path_rec *alt_path = param->alternate_path;
1323         bool pri_ext = false;
1324
1325         if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1326                 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1327                                               pri_path->opa.slid);
1328
1329         cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1330                               cm_form_tid(cm_id_priv), param->ece.attr_mod);
1331
1332         IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1333                 be32_to_cpu(cm_id_priv->id.local_id));
1334         IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1335         IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1336                 be64_to_cpu(cm_id_priv->id.device->node_guid));
1337         IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1338         IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1339         IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1340                 param->remote_cm_response_timeout);
1341         cm_req_set_qp_type(req_msg, param->qp_type);
1342         IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1343         IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1344         IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1345                 param->local_cm_response_timeout);
1346         IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1347                 be16_to_cpu(param->primary_path->pkey));
1348         IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1349                 param->primary_path->mtu);
1350         IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1351
1352         if (param->qp_type != IB_QPT_XRC_INI) {
1353                 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1354                         param->responder_resources);
1355                 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1356                 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1357                         param->rnr_retry_count);
1358                 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1359         }
1360
1361         *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1362                 pri_path->sgid;
1363         *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1364                 pri_path->dgid;
1365         if (pri_ext) {
1366                 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1367                         ->global.interface_id =
1368                         OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1369                 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1370                         ->global.interface_id =
1371                         OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1372         }
1373         if (pri_path->hop_limit <= 1) {
1374                 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1375                         be16_to_cpu(pri_ext ? 0 :
1376                                               htons(ntohl(sa_path_get_slid(
1377                                                       pri_path)))));
1378                 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1379                         be16_to_cpu(pri_ext ? 0 :
1380                                               htons(ntohl(sa_path_get_dlid(
1381                                                       pri_path)))));
1382         } else {
1383                 /* Work-around until there's a way to obtain remote LID info */
1384                 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1385                         be16_to_cpu(IB_LID_PERMISSIVE));
1386                 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1387                         be16_to_cpu(IB_LID_PERMISSIVE));
1388         }
1389         IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1390                 be32_to_cpu(pri_path->flow_label));
1391         IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1392         IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1393         IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1394         IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1395         IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1396                 (pri_path->hop_limit <= 1));
1397         IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1398                 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1399                                pri_path->packet_life_time));
1400
1401         if (alt_path) {
1402                 bool alt_ext = false;
1403
1404                 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1405                         alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1406                                                       alt_path->opa.slid);
1407
1408                 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1409                         alt_path->sgid;
1410                 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1411                         alt_path->dgid;
1412                 if (alt_ext) {
1413                         IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1414                                         req_msg)
1415                                 ->global.interface_id =
1416                                 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1417                         IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1418                                         req_msg)
1419                                 ->global.interface_id =
1420                                 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1421                 }
1422                 if (alt_path->hop_limit <= 1) {
1423                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1424                                 be16_to_cpu(
1425                                         alt_ext ? 0 :
1426                                                   htons(ntohl(sa_path_get_slid(
1427                                                           alt_path)))));
1428                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1429                                 be16_to_cpu(
1430                                         alt_ext ? 0 :
1431                                                   htons(ntohl(sa_path_get_dlid(
1432                                                           alt_path)))));
1433                 } else {
1434                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1435                                 be16_to_cpu(IB_LID_PERMISSIVE));
1436                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1437                                 be16_to_cpu(IB_LID_PERMISSIVE));
1438                 }
1439                 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1440                         be32_to_cpu(alt_path->flow_label));
1441                 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1442                 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1443                         alt_path->traffic_class);
1444                 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1445                         alt_path->hop_limit);
1446                 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1447                 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1448                         (alt_path->hop_limit <= 1));
1449                 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1450                         cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1451                                        alt_path->packet_life_time));
1452         }
1453         IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1454
1455         if (param->private_data && param->private_data_len)
1456                 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1457                             param->private_data_len);
1458 }
1459
1460 static int cm_validate_req_param(struct ib_cm_req_param *param)
1461 {
1462         if (!param->primary_path)
1463                 return -EINVAL;
1464
1465         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1466             param->qp_type != IB_QPT_XRC_INI)
1467                 return -EINVAL;
1468
1469         if (param->private_data &&
1470             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1471                 return -EINVAL;
1472
1473         if (param->alternate_path &&
1474             (param->alternate_path->pkey != param->primary_path->pkey ||
1475              param->alternate_path->mtu != param->primary_path->mtu))
1476                 return -EINVAL;
1477
1478         return 0;
1479 }
1480
1481 int ib_send_cm_req(struct ib_cm_id *cm_id,
1482                    struct ib_cm_req_param *param)
1483 {
1484         struct cm_av av = {}, alt_av = {};
1485         struct cm_id_private *cm_id_priv;
1486         struct ib_mad_send_buf *msg;
1487         struct cm_req_msg *req_msg;
1488         unsigned long flags;
1489         int ret;
1490
1491         ret = cm_validate_req_param(param);
1492         if (ret)
1493                 return ret;
1494
1495         /* Verify that we're not in timewait. */
1496         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1497         spin_lock_irqsave(&cm_id_priv->lock, flags);
1498         if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1499                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1500                 return -EINVAL;
1501         }
1502         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1503
1504         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1505                                                             id.local_id);
1506         if (IS_ERR(cm_id_priv->timewait_info)) {
1507                 ret = PTR_ERR(cm_id_priv->timewait_info);
1508                 cm_id_priv->timewait_info = NULL;
1509                 return ret;
1510         }
1511
1512         ret = cm_init_av_by_path(param->primary_path,
1513                                  param->ppath_sgid_attr, &av);
1514         if (ret)
1515                 return ret;
1516         if (param->alternate_path) {
1517                 ret = cm_init_av_by_path(param->alternate_path, NULL,
1518                                          &alt_av);
1519                 if (ret) {
1520                         cm_destroy_av(&av);
1521                         return ret;
1522                 }
1523         }
1524         cm_id->service_id = param->service_id;
1525         cm_id->service_mask = ~cpu_to_be64(0);
1526         cm_id_priv->timeout_ms = cm_convert_to_ms(
1527                                     param->primary_path->packet_life_time) * 2 +
1528                                  cm_convert_to_ms(
1529                                     param->remote_cm_response_timeout);
1530         cm_id_priv->max_cm_retries = param->max_cm_retries;
1531         cm_id_priv->initiator_depth = param->initiator_depth;
1532         cm_id_priv->responder_resources = param->responder_resources;
1533         cm_id_priv->retry_count = param->retry_count;
1534         cm_id_priv->path_mtu = param->primary_path->mtu;
1535         cm_id_priv->pkey = param->primary_path->pkey;
1536         cm_id_priv->qp_type = param->qp_type;
1537
1538         spin_lock_irqsave(&cm_id_priv->lock, flags);
1539
1540         cm_move_av_from_path(&cm_id_priv->av, &av);
1541         if (param->alternate_path)
1542                 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
1543
1544         msg = cm_alloc_priv_msg(cm_id_priv);
1545         if (IS_ERR(msg)) {
1546                 ret = PTR_ERR(msg);
1547                 goto out_unlock;
1548         }
1549
1550         req_msg = (struct cm_req_msg *)msg->mad;
1551         cm_format_req(req_msg, cm_id_priv, param);
1552         cm_id_priv->tid = req_msg->hdr.tid;
1553         msg->timeout_ms = cm_id_priv->timeout_ms;
1554         msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT;
1555
1556         cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1557         cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1558
1559         trace_icm_send_req(&cm_id_priv->id);
1560         ret = ib_post_send_mad(msg, NULL);
1561         if (ret)
1562                 goto out_free;
1563         BUG_ON(cm_id->state != IB_CM_IDLE);
1564         cm_id->state = IB_CM_REQ_SENT;
1565         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1566         return 0;
1567 out_free:
1568         cm_free_priv_msg(msg);
1569 out_unlock:
1570         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1571         return ret;
1572 }
1573 EXPORT_SYMBOL(ib_send_cm_req);
1574
1575 static int cm_issue_rej(struct cm_port *port,
1576                         struct ib_mad_recv_wc *mad_recv_wc,
1577                         enum ib_cm_rej_reason reason,
1578                         enum cm_msg_response msg_rejected,
1579                         void *ari, u8 ari_length)
1580 {
1581         struct ib_mad_send_buf *msg = NULL;
1582         struct cm_rej_msg *rej_msg, *rcv_msg;
1583         int ret;
1584
1585         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1586         if (ret)
1587                 return ret;
1588
1589         /* We just need common CM header information.  Cast to any message. */
1590         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1591         rej_msg = (struct cm_rej_msg *) msg->mad;
1592
1593         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1594         IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1595                 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1596         IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1597                 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1598         IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1599         IBA_SET(CM_REJ_REASON, rej_msg, reason);
1600
1601         if (ari && ari_length) {
1602                 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1603                 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1604         }
1605
1606         trace_icm_issue_rej(
1607                 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg),
1608                 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1609         ret = ib_post_send_mad(msg, NULL);
1610         if (ret)
1611                 cm_free_response_msg(msg);
1612
1613         return ret;
1614 }
1615
1616 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1617 {
1618         return ((cpu_to_be16(
1619                         IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1620                 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1621                                                req_msg))));
1622 }
1623
1624 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num,
1625                                  struct sa_path_rec *path, union ib_gid *gid)
1626 {
1627         if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1628                 path->rec_type = SA_PATH_REC_TYPE_OPA;
1629         else
1630                 path->rec_type = SA_PATH_REC_TYPE_IB;
1631 }
1632
1633 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1634                                         struct sa_path_rec *primary_path,
1635                                         struct sa_path_rec *alt_path)
1636 {
1637         u32 lid;
1638
1639         if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1640                 sa_path_set_dlid(primary_path,
1641                                  IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
1642                                          req_msg));
1643                 sa_path_set_slid(primary_path,
1644                                  IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1645                                          req_msg));
1646         } else {
1647                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1648                         CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1649                 sa_path_set_dlid(primary_path, lid);
1650
1651                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1652                         CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1653                 sa_path_set_slid(primary_path, lid);
1654         }
1655
1656         if (!cm_req_has_alt_path(req_msg))
1657                 return;
1658
1659         if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1660                 sa_path_set_dlid(alt_path,
1661                                  IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1662                                          req_msg));
1663                 sa_path_set_slid(alt_path,
1664                                  IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1665                                          req_msg));
1666         } else {
1667                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1668                         CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1669                 sa_path_set_dlid(alt_path, lid);
1670
1671                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1672                         CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1673                 sa_path_set_slid(alt_path, lid);
1674         }
1675 }
1676
1677 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1678                                      struct sa_path_rec *primary_path,
1679                                      struct sa_path_rec *alt_path)
1680 {
1681         primary_path->dgid =
1682                 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1683         primary_path->sgid =
1684                 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1685         primary_path->flow_label =
1686                 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1687         primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1688         primary_path->traffic_class =
1689                 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1690         primary_path->reversible = 1;
1691         primary_path->pkey =
1692                 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1693         primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1694         primary_path->mtu_selector = IB_SA_EQ;
1695         primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1696         primary_path->rate_selector = IB_SA_EQ;
1697         primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1698         primary_path->packet_life_time_selector = IB_SA_EQ;
1699         primary_path->packet_life_time =
1700                 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1701         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1702         primary_path->service_id =
1703                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1704         if (sa_path_is_roce(primary_path))
1705                 primary_path->roce.route_resolved = false;
1706
1707         if (cm_req_has_alt_path(req_msg)) {
1708                 alt_path->dgid = *IBA_GET_MEM_PTR(
1709                         CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1710                 alt_path->sgid = *IBA_GET_MEM_PTR(
1711                         CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1712                 alt_path->flow_label = cpu_to_be32(
1713                         IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1714                 alt_path->hop_limit =
1715                         IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1716                 alt_path->traffic_class =
1717                         IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1718                 alt_path->reversible = 1;
1719                 alt_path->pkey =
1720                         cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1721                 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1722                 alt_path->mtu_selector = IB_SA_EQ;
1723                 alt_path->mtu =
1724                         IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1725                 alt_path->rate_selector = IB_SA_EQ;
1726                 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1727                 alt_path->packet_life_time_selector = IB_SA_EQ;
1728                 alt_path->packet_life_time =
1729                         IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1730                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1731                 alt_path->service_id =
1732                         cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1733
1734                 if (sa_path_is_roce(alt_path))
1735                         alt_path->roce.route_resolved = false;
1736         }
1737         cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1738 }
1739
1740 static u16 cm_get_bth_pkey(struct cm_work *work)
1741 {
1742         struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1743         u32 port_num = work->port->port_num;
1744         u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1745         u16 pkey;
1746         int ret;
1747
1748         ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1749         if (ret) {
1750                 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n",
1751                                      port_num, pkey_index, ret);
1752                 return 0;
1753         }
1754
1755         return pkey;
1756 }
1757
1758 /**
1759  * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID
1760  * ULPs (such as IPoIB) do not understand OPA GIDs and will
1761  * reject them as the local_gid will not match the sgid. Therefore,
1762  * change the pathrec's SGID to an IB SGID.
1763  *
1764  * @work: Work completion
1765  * @path: Path record
1766  */
1767 static void cm_opa_to_ib_sgid(struct cm_work *work,
1768                               struct sa_path_rec *path)
1769 {
1770         struct ib_device *dev = work->port->cm_dev->ib_device;
1771         u32 port_num = work->port->port_num;
1772
1773         if (rdma_cap_opa_ah(dev, port_num) &&
1774             (ib_is_opa_gid(&path->sgid))) {
1775                 union ib_gid sgid;
1776
1777                 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1778                         dev_warn(&dev->dev,
1779                                  "Error updating sgid in CM request\n");
1780                         return;
1781                 }
1782
1783                 path->sgid = sgid;
1784         }
1785 }
1786
1787 static void cm_format_req_event(struct cm_work *work,
1788                                 struct cm_id_private *cm_id_priv,
1789                                 struct ib_cm_id *listen_id)
1790 {
1791         struct cm_req_msg *req_msg;
1792         struct ib_cm_req_event_param *param;
1793
1794         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1795         param = &work->cm_event.param.req_rcvd;
1796         param->listen_id = listen_id;
1797         param->bth_pkey = cm_get_bth_pkey(work);
1798         param->port = cm_id_priv->av.port->port_num;
1799         param->primary_path = &work->path[0];
1800         cm_opa_to_ib_sgid(work, param->primary_path);
1801         if (cm_req_has_alt_path(req_msg)) {
1802                 param->alternate_path = &work->path[1];
1803                 cm_opa_to_ib_sgid(work, param->alternate_path);
1804         } else {
1805                 param->alternate_path = NULL;
1806         }
1807         param->remote_ca_guid =
1808                 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1809         param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1810         param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1811         param->qp_type = cm_req_get_qp_type(req_msg);
1812         param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1813         param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1814         param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1815         param->local_cm_response_timeout =
1816                 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1817         param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1818         param->remote_cm_response_timeout =
1819                 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1820         param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1821         param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1822         param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1823         param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1824         param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1825         param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1826
1827         work->cm_event.private_data =
1828                 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1829 }
1830
1831 static void cm_process_work(struct cm_id_private *cm_id_priv,
1832                             struct cm_work *work)
1833 {
1834         int ret;
1835
1836         /* We will typically only have the current event to report. */
1837         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1838         cm_free_work(work);
1839
1840         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1841                 spin_lock_irq(&cm_id_priv->lock);
1842                 work = cm_dequeue_work(cm_id_priv);
1843                 spin_unlock_irq(&cm_id_priv->lock);
1844                 if (!work)
1845                         return;
1846
1847                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1848                                                 &work->cm_event);
1849                 cm_free_work(work);
1850         }
1851         cm_deref_id(cm_id_priv);
1852         if (ret)
1853                 cm_destroy_id(&cm_id_priv->id, ret);
1854 }
1855
1856 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1857                           struct cm_id_private *cm_id_priv,
1858                           enum cm_msg_response msg_mraed, u8 service_timeout,
1859                           const void *private_data, u8 private_data_len)
1860 {
1861         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1862         IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1863         IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1864                 be32_to_cpu(cm_id_priv->id.local_id));
1865         IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1866                 be32_to_cpu(cm_id_priv->id.remote_id));
1867         IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1868
1869         if (private_data && private_data_len)
1870                 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1871                             private_data_len);
1872 }
1873
1874 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1875                           struct cm_id_private *cm_id_priv,
1876                           enum ib_cm_rej_reason reason, void *ari,
1877                           u8 ari_length, const void *private_data,
1878                           u8 private_data_len, enum ib_cm_state state)
1879 {
1880         lockdep_assert_held(&cm_id_priv->lock);
1881
1882         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1883         IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1884                 be32_to_cpu(cm_id_priv->id.remote_id));
1885
1886         switch (state) {
1887         case IB_CM_REQ_RCVD:
1888                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1889                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1890                 break;
1891         case IB_CM_MRA_REQ_SENT:
1892                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1893                         be32_to_cpu(cm_id_priv->id.local_id));
1894                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1895                 break;
1896         case IB_CM_REP_RCVD:
1897         case IB_CM_MRA_REP_SENT:
1898                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1899                         be32_to_cpu(cm_id_priv->id.local_id));
1900                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1901                 break;
1902         default:
1903                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1904                         be32_to_cpu(cm_id_priv->id.local_id));
1905                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1906                         CM_MSG_RESPONSE_OTHER);
1907                 break;
1908         }
1909
1910         IBA_SET(CM_REJ_REASON, rej_msg, reason);
1911         if (ari && ari_length) {
1912                 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1913                 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1914         }
1915
1916         if (private_data && private_data_len)
1917                 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1918                             private_data_len);
1919 }
1920
1921 static void cm_dup_req_handler(struct cm_work *work,
1922                                struct cm_id_private *cm_id_priv)
1923 {
1924         struct ib_mad_send_buf *msg = NULL;
1925         int ret;
1926
1927         atomic_long_inc(
1928                 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]);
1929
1930         /* Quick state check to discard duplicate REQs. */
1931         spin_lock_irq(&cm_id_priv->lock);
1932         if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1933                 spin_unlock_irq(&cm_id_priv->lock);
1934                 return;
1935         }
1936         spin_unlock_irq(&cm_id_priv->lock);
1937
1938         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1939         if (ret)
1940                 return;
1941
1942         spin_lock_irq(&cm_id_priv->lock);
1943         switch (cm_id_priv->id.state) {
1944         case IB_CM_MRA_REQ_SENT:
1945                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1946                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1947                               cm_id_priv->private_data,
1948                               cm_id_priv->private_data_len);
1949                 break;
1950         case IB_CM_TIMEWAIT:
1951                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1952                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1953                               IB_CM_TIMEWAIT);
1954                 break;
1955         default:
1956                 goto unlock;
1957         }
1958         spin_unlock_irq(&cm_id_priv->lock);
1959
1960         trace_icm_send_dup_req(&cm_id_priv->id);
1961         ret = ib_post_send_mad(msg, NULL);
1962         if (ret)
1963                 goto free;
1964         return;
1965
1966 unlock: spin_unlock_irq(&cm_id_priv->lock);
1967 free:   cm_free_response_msg(msg);
1968 }
1969
1970 static struct cm_id_private *cm_match_req(struct cm_work *work,
1971                                           struct cm_id_private *cm_id_priv)
1972 {
1973         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1974         struct cm_timewait_info *timewait_info;
1975         struct cm_req_msg *req_msg;
1976
1977         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1978
1979         /* Check for possible duplicate REQ. */
1980         spin_lock_irq(&cm.lock);
1981         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1982         if (timewait_info) {
1983                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1984                                            timewait_info->work.remote_id);
1985                 spin_unlock_irq(&cm.lock);
1986                 if (cur_cm_id_priv) {
1987                         cm_dup_req_handler(work, cur_cm_id_priv);
1988                         cm_deref_id(cur_cm_id_priv);
1989                 }
1990                 return NULL;
1991         }
1992
1993         /* Check for stale connections. */
1994         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1995         if (timewait_info) {
1996                 cm_remove_remote(cm_id_priv);
1997                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1998                                            timewait_info->work.remote_id);
1999
2000                 spin_unlock_irq(&cm.lock);
2001                 cm_issue_rej(work->port, work->mad_recv_wc,
2002                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
2003                              NULL, 0);
2004                 if (cur_cm_id_priv) {
2005                         ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2006                         cm_deref_id(cur_cm_id_priv);
2007                 }
2008                 return NULL;
2009         }
2010
2011         /* Find matching listen request. */
2012         listen_cm_id_priv = cm_find_listen(
2013                 cm_id_priv->id.device,
2014                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2015         if (!listen_cm_id_priv) {
2016                 cm_remove_remote(cm_id_priv);
2017                 spin_unlock_irq(&cm.lock);
2018                 cm_issue_rej(work->port, work->mad_recv_wc,
2019                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2020                              NULL, 0);
2021                 return NULL;
2022         }
2023         spin_unlock_irq(&cm.lock);
2024         return listen_cm_id_priv;
2025 }
2026
2027 /*
2028  * Work-around for inter-subnet connections.  If the LIDs are permissive,
2029  * we need to override the LID/SL data in the REQ with the LID information
2030  * in the work completion.
2031  */
2032 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2033 {
2034         if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2035                 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2036                                         req_msg)) == IB_LID_PERMISSIVE) {
2037                         IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2038                                 be16_to_cpu(ib_lid_be16(wc->slid)));
2039                         IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2040                 }
2041
2042                 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2043                                         req_msg)) == IB_LID_PERMISSIVE)
2044                         IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2045                                 wc->dlid_path_bits);
2046         }
2047
2048         if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2049                 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2050                                         req_msg)) == IB_LID_PERMISSIVE) {
2051                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2052                                 be16_to_cpu(ib_lid_be16(wc->slid)));
2053                         IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2054                 }
2055
2056                 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2057                                         req_msg)) == IB_LID_PERMISSIVE)
2058                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2059                                 wc->dlid_path_bits);
2060         }
2061 }
2062
2063 static int cm_req_handler(struct cm_work *work)
2064 {
2065         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2066         struct cm_req_msg *req_msg;
2067         const struct ib_global_route *grh;
2068         const struct ib_gid_attr *gid_attr;
2069         int ret;
2070
2071         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2072
2073         cm_id_priv =
2074                 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2075         if (IS_ERR(cm_id_priv))
2076                 return PTR_ERR(cm_id_priv);
2077
2078         cm_id_priv->id.remote_id =
2079                 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2080         cm_id_priv->id.service_id =
2081                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2082         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
2083         cm_id_priv->tid = req_msg->hdr.tid;
2084         cm_id_priv->timeout_ms = cm_convert_to_ms(
2085                 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2086         cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2087         cm_id_priv->remote_qpn =
2088                 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2089         cm_id_priv->initiator_depth =
2090                 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2091         cm_id_priv->responder_resources =
2092                 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2093         cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2094         cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2095         cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2096         cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2097         cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2098         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2099
2100         ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2101                                       work->mad_recv_wc->recv_buf.grh,
2102                                       &cm_id_priv->av);
2103         if (ret)
2104                 goto destroy;
2105         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2106                                                             id.local_id);
2107         if (IS_ERR(cm_id_priv->timewait_info)) {
2108                 ret = PTR_ERR(cm_id_priv->timewait_info);
2109                 cm_id_priv->timewait_info = NULL;
2110                 goto destroy;
2111         }
2112         cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2113         cm_id_priv->timewait_info->remote_ca_guid =
2114                 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2115         cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2116
2117         /*
2118          * Note that the ID pointer is not in the xarray at this point,
2119          * so this set is only visible to the local thread.
2120          */
2121         cm_id_priv->id.state = IB_CM_REQ_RCVD;
2122
2123         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2124         if (!listen_cm_id_priv) {
2125                 trace_icm_no_listener_err(&cm_id_priv->id);
2126                 cm_id_priv->id.state = IB_CM_IDLE;
2127                 ret = -EINVAL;
2128                 goto destroy;
2129         }
2130
2131         memset(&work->path[0], 0, sizeof(work->path[0]));
2132         if (cm_req_has_alt_path(req_msg))
2133                 memset(&work->path[1], 0, sizeof(work->path[1]));
2134         grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2135         gid_attr = grh->sgid_attr;
2136
2137         if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) {
2138                 work->path[0].rec_type =
2139                         sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2140         } else {
2141                 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2142                 cm_path_set_rec_type(
2143                         work->port->cm_dev->ib_device, work->port->port_num,
2144                         &work->path[0],
2145                         IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2146                                         req_msg));
2147         }
2148         if (cm_req_has_alt_path(req_msg))
2149                 work->path[1].rec_type = work->path[0].rec_type;
2150         cm_format_paths_from_req(req_msg, &work->path[0],
2151                                  &work->path[1]);
2152         if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2153                 sa_path_set_dmac(&work->path[0],
2154                                  cm_id_priv->av.ah_attr.roce.dmac);
2155         work->path[0].hop_limit = grh->hop_limit;
2156
2157         /* This destroy call is needed to pair with cm_init_av_for_response */
2158         cm_destroy_av(&cm_id_priv->av);
2159         ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av);
2160         if (ret) {
2161                 int err;
2162
2163                 err = rdma_query_gid(work->port->cm_dev->ib_device,
2164                                      work->port->port_num, 0,
2165                                      &work->path[0].sgid);
2166                 if (err)
2167                         ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2168                                        NULL, 0, NULL, 0);
2169                 else
2170                         ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2171                                        &work->path[0].sgid,
2172                                        sizeof(work->path[0].sgid),
2173                                        NULL, 0);
2174                 goto rejected;
2175         }
2176         if (cm_req_has_alt_path(req_msg)) {
2177                 ret = cm_init_av_by_path(&work->path[1], NULL,
2178                                          &cm_id_priv->alt_av);
2179                 if (ret) {
2180                         ib_send_cm_rej(&cm_id_priv->id,
2181                                        IB_CM_REJ_INVALID_ALT_GID,
2182                                        &work->path[0].sgid,
2183                                        sizeof(work->path[0].sgid), NULL, 0);
2184                         goto rejected;
2185                 }
2186         }
2187
2188         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2189         cm_id_priv->id.context = listen_cm_id_priv->id.context;
2190         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2191
2192         /* Now MAD handlers can see the new ID */
2193         spin_lock_irq(&cm_id_priv->lock);
2194         cm_finalize_id(cm_id_priv);
2195
2196         /* Refcount belongs to the event, pairs with cm_process_work() */
2197         refcount_inc(&cm_id_priv->refcount);
2198         cm_queue_work_unlock(cm_id_priv, work);
2199         /*
2200          * Since this ID was just created and was not made visible to other MAD
2201          * handlers until the cm_finalize_id() above we know that the
2202          * cm_process_work() will deliver the event and the listen_cm_id
2203          * embedded in the event can be derefed here.
2204          */
2205         cm_deref_id(listen_cm_id_priv);
2206         return 0;
2207
2208 rejected:
2209         cm_deref_id(listen_cm_id_priv);
2210 destroy:
2211         ib_destroy_cm_id(&cm_id_priv->id);
2212         return ret;
2213 }
2214
2215 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2216                           struct cm_id_private *cm_id_priv,
2217                           struct ib_cm_rep_param *param)
2218 {
2219         cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2220                               param->ece.attr_mod);
2221         IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2222                 be32_to_cpu(cm_id_priv->id.local_id));
2223         IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2224                 be32_to_cpu(cm_id_priv->id.remote_id));
2225         IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2226         IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2227                 param->responder_resources);
2228         IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2229                 cm_id_priv->av.port->cm_dev->ack_delay);
2230         IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2231         IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2232         IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2233                 be64_to_cpu(cm_id_priv->id.device->node_guid));
2234
2235         if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2236                 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2237                         param->initiator_depth);
2238                 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2239                         param->flow_control);
2240                 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2241                 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2242         } else {
2243                 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2244                 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2245         }
2246
2247         IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2248         IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2249         IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2250
2251         if (param->private_data && param->private_data_len)
2252                 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2253                             param->private_data_len);
2254 }
2255
2256 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2257                    struct ib_cm_rep_param *param)
2258 {
2259         struct cm_id_private *cm_id_priv;
2260         struct ib_mad_send_buf *msg;
2261         struct cm_rep_msg *rep_msg;
2262         unsigned long flags;
2263         int ret;
2264
2265         if (param->private_data &&
2266             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2267                 return -EINVAL;
2268
2269         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2270         spin_lock_irqsave(&cm_id_priv->lock, flags);
2271         if (cm_id->state != IB_CM_REQ_RCVD &&
2272             cm_id->state != IB_CM_MRA_REQ_SENT) {
2273                 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state);
2274                 ret = -EINVAL;
2275                 goto out;
2276         }
2277
2278         msg = cm_alloc_priv_msg(cm_id_priv);
2279         if (IS_ERR(msg)) {
2280                 ret = PTR_ERR(msg);
2281                 goto out;
2282         }
2283
2284         rep_msg = (struct cm_rep_msg *) msg->mad;
2285         cm_format_rep(rep_msg, cm_id_priv, param);
2286         msg->timeout_ms = cm_id_priv->timeout_ms;
2287         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2288
2289         trace_icm_send_rep(cm_id);
2290         ret = ib_post_send_mad(msg, NULL);
2291         if (ret)
2292                 goto out_free;
2293
2294         cm_id->state = IB_CM_REP_SENT;
2295         cm_id_priv->initiator_depth = param->initiator_depth;
2296         cm_id_priv->responder_resources = param->responder_resources;
2297         cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2298         WARN_ONCE(param->qp_num & 0xFF000000,
2299                   "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2300                   param->qp_num);
2301         cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2302         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2303         return 0;
2304
2305 out_free:
2306         cm_free_priv_msg(msg);
2307 out:
2308         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2309         return ret;
2310 }
2311 EXPORT_SYMBOL(ib_send_cm_rep);
2312
2313 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2314                           struct cm_id_private *cm_id_priv,
2315                           const void *private_data,
2316                           u8 private_data_len)
2317 {
2318         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2319         IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2320                 be32_to_cpu(cm_id_priv->id.local_id));
2321         IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2322                 be32_to_cpu(cm_id_priv->id.remote_id));
2323
2324         if (private_data && private_data_len)
2325                 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2326                             private_data_len);
2327 }
2328
2329 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2330                    const void *private_data,
2331                    u8 private_data_len)
2332 {
2333         struct cm_id_private *cm_id_priv;
2334         struct ib_mad_send_buf *msg;
2335         unsigned long flags;
2336         void *data;
2337         int ret;
2338
2339         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2340                 return -EINVAL;
2341
2342         data = cm_copy_private_data(private_data, private_data_len);
2343         if (IS_ERR(data))
2344                 return PTR_ERR(data);
2345
2346         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2347         spin_lock_irqsave(&cm_id_priv->lock, flags);
2348         if (cm_id->state != IB_CM_REP_RCVD &&
2349             cm_id->state != IB_CM_MRA_REP_SENT) {
2350                 trace_icm_send_cm_rtu_err(cm_id);
2351                 ret = -EINVAL;
2352                 goto error;
2353         }
2354
2355         msg = cm_alloc_msg(cm_id_priv);
2356         if (IS_ERR(msg)) {
2357                 ret = PTR_ERR(msg);
2358                 goto error;
2359         }
2360
2361         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2362                       private_data, private_data_len);
2363
2364         trace_icm_send_rtu(cm_id);
2365         ret = ib_post_send_mad(msg, NULL);
2366         if (ret) {
2367                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2368                 cm_free_msg(msg);
2369                 kfree(data);
2370                 return ret;
2371         }
2372
2373         cm_id->state = IB_CM_ESTABLISHED;
2374         cm_set_private_data(cm_id_priv, data, private_data_len);
2375         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2376         return 0;
2377
2378 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2379         kfree(data);
2380         return ret;
2381 }
2382 EXPORT_SYMBOL(ib_send_cm_rtu);
2383
2384 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2385 {
2386         struct cm_rep_msg *rep_msg;
2387         struct ib_cm_rep_event_param *param;
2388
2389         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2390         param = &work->cm_event.param.rep_rcvd;
2391         param->remote_ca_guid =
2392                 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2393         param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2394         param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2395         param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2396         param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2397         param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2398         param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2399         param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2400         param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2401         param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2402         param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2403         param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2404         param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2405         param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2406         param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2407
2408         work->cm_event.private_data =
2409                 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2410 }
2411
2412 static void cm_dup_rep_handler(struct cm_work *work)
2413 {
2414         struct cm_id_private *cm_id_priv;
2415         struct cm_rep_msg *rep_msg;
2416         struct ib_mad_send_buf *msg = NULL;
2417         int ret;
2418
2419         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2420         cm_id_priv = cm_acquire_id(
2421                 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2422                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2423         if (!cm_id_priv)
2424                 return;
2425
2426         atomic_long_inc(
2427                 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]);
2428         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2429         if (ret)
2430                 goto deref;
2431
2432         spin_lock_irq(&cm_id_priv->lock);
2433         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2434                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2435                               cm_id_priv->private_data,
2436                               cm_id_priv->private_data_len);
2437         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2438                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2439                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2440                               cm_id_priv->private_data,
2441                               cm_id_priv->private_data_len);
2442         else
2443                 goto unlock;
2444         spin_unlock_irq(&cm_id_priv->lock);
2445
2446         trace_icm_send_dup_rep(&cm_id_priv->id);
2447         ret = ib_post_send_mad(msg, NULL);
2448         if (ret)
2449                 goto free;
2450         goto deref;
2451
2452 unlock: spin_unlock_irq(&cm_id_priv->lock);
2453 free:   cm_free_response_msg(msg);
2454 deref:  cm_deref_id(cm_id_priv);
2455 }
2456
2457 static int cm_rep_handler(struct cm_work *work)
2458 {
2459         struct cm_id_private *cm_id_priv;
2460         struct cm_rep_msg *rep_msg;
2461         int ret;
2462         struct cm_id_private *cur_cm_id_priv;
2463         struct cm_timewait_info *timewait_info;
2464
2465         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2466         cm_id_priv = cm_acquire_id(
2467                 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2468         if (!cm_id_priv) {
2469                 cm_dup_rep_handler(work);
2470                 trace_icm_remote_no_priv_err(
2471                          IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2472                 return -EINVAL;
2473         }
2474
2475         cm_format_rep_event(work, cm_id_priv->qp_type);
2476
2477         spin_lock_irq(&cm_id_priv->lock);
2478         switch (cm_id_priv->id.state) {
2479         case IB_CM_REQ_SENT:
2480         case IB_CM_MRA_REQ_RCVD:
2481                 break;
2482         default:
2483                 ret = -EINVAL;
2484                 trace_icm_rep_unknown_err(
2485                         IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2486                         IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2487                         cm_id_priv->id.state);
2488                 spin_unlock_irq(&cm_id_priv->lock);
2489                 goto error;
2490         }
2491
2492         cm_id_priv->timewait_info->work.remote_id =
2493                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2494         cm_id_priv->timewait_info->remote_ca_guid =
2495                 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2496         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2497
2498         spin_lock(&cm.lock);
2499         /* Check for duplicate REP. */
2500         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2501                 spin_unlock(&cm.lock);
2502                 spin_unlock_irq(&cm_id_priv->lock);
2503                 ret = -EINVAL;
2504                 trace_icm_insert_failed_err(
2505                          IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2506                 goto error;
2507         }
2508         /* Check for a stale connection. */
2509         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2510         if (timewait_info) {
2511                 cm_remove_remote(cm_id_priv);
2512                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2513                                            timewait_info->work.remote_id);
2514
2515                 spin_unlock(&cm.lock);
2516                 spin_unlock_irq(&cm_id_priv->lock);
2517                 cm_issue_rej(work->port, work->mad_recv_wc,
2518                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2519                              NULL, 0);
2520                 ret = -EINVAL;
2521                 trace_icm_staleconn_err(
2522                         IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2523                         IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2524
2525                 if (cur_cm_id_priv) {
2526                         ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2527                         cm_deref_id(cur_cm_id_priv);
2528                 }
2529
2530                 goto error;
2531         }
2532         spin_unlock(&cm.lock);
2533
2534         cm_id_priv->id.state = IB_CM_REP_RCVD;
2535         cm_id_priv->id.remote_id =
2536                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2537         cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2538         cm_id_priv->initiator_depth =
2539                 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2540         cm_id_priv->responder_resources =
2541                 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2542         cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2543         cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2544         cm_id_priv->target_ack_delay =
2545                 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2546         cm_id_priv->av.timeout =
2547                         cm_ack_timeout(cm_id_priv->target_ack_delay,
2548                                        cm_id_priv->av.timeout - 1);
2549         cm_id_priv->alt_av.timeout =
2550                         cm_ack_timeout(cm_id_priv->target_ack_delay,
2551                                        cm_id_priv->alt_av.timeout - 1);
2552
2553         ib_cancel_mad(cm_id_priv->msg);
2554         cm_queue_work_unlock(cm_id_priv, work);
2555         return 0;
2556
2557 error:
2558         cm_deref_id(cm_id_priv);
2559         return ret;
2560 }
2561
2562 static int cm_establish_handler(struct cm_work *work)
2563 {
2564         struct cm_id_private *cm_id_priv;
2565
2566         /* See comment in cm_establish about lookup. */
2567         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2568         if (!cm_id_priv)
2569                 return -EINVAL;
2570
2571         spin_lock_irq(&cm_id_priv->lock);
2572         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2573                 spin_unlock_irq(&cm_id_priv->lock);
2574                 goto out;
2575         }
2576
2577         ib_cancel_mad(cm_id_priv->msg);
2578         cm_queue_work_unlock(cm_id_priv, work);
2579         return 0;
2580 out:
2581         cm_deref_id(cm_id_priv);
2582         return -EINVAL;
2583 }
2584
2585 static int cm_rtu_handler(struct cm_work *work)
2586 {
2587         struct cm_id_private *cm_id_priv;
2588         struct cm_rtu_msg *rtu_msg;
2589
2590         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2591         cm_id_priv = cm_acquire_id(
2592                 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2593                 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2594         if (!cm_id_priv)
2595                 return -EINVAL;
2596
2597         work->cm_event.private_data =
2598                 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2599
2600         spin_lock_irq(&cm_id_priv->lock);
2601         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2602             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2603                 spin_unlock_irq(&cm_id_priv->lock);
2604                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2605                                                      [CM_RTU_COUNTER]);
2606                 goto out;
2607         }
2608         cm_id_priv->id.state = IB_CM_ESTABLISHED;
2609
2610         ib_cancel_mad(cm_id_priv->msg);
2611         cm_queue_work_unlock(cm_id_priv, work);
2612         return 0;
2613 out:
2614         cm_deref_id(cm_id_priv);
2615         return -EINVAL;
2616 }
2617
2618 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2619                           struct cm_id_private *cm_id_priv,
2620                           const void *private_data,
2621                           u8 private_data_len)
2622 {
2623         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2624                           cm_form_tid(cm_id_priv));
2625         IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2626                 be32_to_cpu(cm_id_priv->id.local_id));
2627         IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2628                 be32_to_cpu(cm_id_priv->id.remote_id));
2629         IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2630                 be32_to_cpu(cm_id_priv->remote_qpn));
2631
2632         if (private_data && private_data_len)
2633                 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2634                             private_data_len);
2635 }
2636
2637 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2638                                const void *private_data, u8 private_data_len)
2639 {
2640         struct ib_mad_send_buf *msg;
2641         int ret;
2642
2643         lockdep_assert_held(&cm_id_priv->lock);
2644
2645         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2646                 return -EINVAL;
2647
2648         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2649                 trace_icm_dreq_skipped(&cm_id_priv->id);
2650                 return -EINVAL;
2651         }
2652
2653         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2654             cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2655                 ib_cancel_mad(cm_id_priv->msg);
2656
2657         msg = cm_alloc_priv_msg(cm_id_priv);
2658         if (IS_ERR(msg)) {
2659                 cm_enter_timewait(cm_id_priv);
2660                 return PTR_ERR(msg);
2661         }
2662
2663         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2664                        private_data, private_data_len);
2665         msg->timeout_ms = cm_id_priv->timeout_ms;
2666         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2667
2668         trace_icm_send_dreq(&cm_id_priv->id);
2669         ret = ib_post_send_mad(msg, NULL);
2670         if (ret) {
2671                 cm_enter_timewait(cm_id_priv);
2672                 cm_free_priv_msg(msg);
2673                 return ret;
2674         }
2675
2676         cm_id_priv->id.state = IB_CM_DREQ_SENT;
2677         return 0;
2678 }
2679
2680 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2681                     u8 private_data_len)
2682 {
2683         struct cm_id_private *cm_id_priv =
2684                 container_of(cm_id, struct cm_id_private, id);
2685         unsigned long flags;
2686         int ret;
2687
2688         spin_lock_irqsave(&cm_id_priv->lock, flags);
2689         ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2690         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2691         return ret;
2692 }
2693 EXPORT_SYMBOL(ib_send_cm_dreq);
2694
2695 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2696                           struct cm_id_private *cm_id_priv,
2697                           const void *private_data,
2698                           u8 private_data_len)
2699 {
2700         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2701         IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2702                 be32_to_cpu(cm_id_priv->id.local_id));
2703         IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2704                 be32_to_cpu(cm_id_priv->id.remote_id));
2705
2706         if (private_data && private_data_len)
2707                 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2708                             private_data_len);
2709 }
2710
2711 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2712                                void *private_data, u8 private_data_len)
2713 {
2714         struct ib_mad_send_buf *msg;
2715         int ret;
2716
2717         lockdep_assert_held(&cm_id_priv->lock);
2718
2719         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2720                 return -EINVAL;
2721
2722         if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2723                 trace_icm_send_drep_err(&cm_id_priv->id);
2724                 kfree(private_data);
2725                 return -EINVAL;
2726         }
2727
2728         cm_set_private_data(cm_id_priv, private_data, private_data_len);
2729         cm_enter_timewait(cm_id_priv);
2730
2731         msg = cm_alloc_msg(cm_id_priv);
2732         if (IS_ERR(msg))
2733                 return PTR_ERR(msg);
2734
2735         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2736                        private_data, private_data_len);
2737
2738         trace_icm_send_drep(&cm_id_priv->id);
2739         ret = ib_post_send_mad(msg, NULL);
2740         if (ret) {
2741                 cm_free_msg(msg);
2742                 return ret;
2743         }
2744         return 0;
2745 }
2746
2747 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2748                     u8 private_data_len)
2749 {
2750         struct cm_id_private *cm_id_priv =
2751                 container_of(cm_id, struct cm_id_private, id);
2752         unsigned long flags;
2753         void *data;
2754         int ret;
2755
2756         data = cm_copy_private_data(private_data, private_data_len);
2757         if (IS_ERR(data))
2758                 return PTR_ERR(data);
2759
2760         spin_lock_irqsave(&cm_id_priv->lock, flags);
2761         ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2762         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2763         return ret;
2764 }
2765 EXPORT_SYMBOL(ib_send_cm_drep);
2766
2767 static int cm_issue_drep(struct cm_port *port,
2768                          struct ib_mad_recv_wc *mad_recv_wc)
2769 {
2770         struct ib_mad_send_buf *msg = NULL;
2771         struct cm_dreq_msg *dreq_msg;
2772         struct cm_drep_msg *drep_msg;
2773         int ret;
2774
2775         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2776         if (ret)
2777                 return ret;
2778
2779         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2780         drep_msg = (struct cm_drep_msg *) msg->mad;
2781
2782         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2783         IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2784                 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2785         IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2786                 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2787
2788         trace_icm_issue_drep(
2789                 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2790                 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2791         ret = ib_post_send_mad(msg, NULL);
2792         if (ret)
2793                 cm_free_response_msg(msg);
2794
2795         return ret;
2796 }
2797
2798 static int cm_dreq_handler(struct cm_work *work)
2799 {
2800         struct cm_id_private *cm_id_priv;
2801         struct cm_dreq_msg *dreq_msg;
2802         struct ib_mad_send_buf *msg = NULL;
2803
2804         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2805         cm_id_priv = cm_acquire_id(
2806                 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2807                 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2808         if (!cm_id_priv) {
2809                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2810                                                      [CM_DREQ_COUNTER]);
2811                 cm_issue_drep(work->port, work->mad_recv_wc);
2812                 trace_icm_no_priv_err(
2813                         IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2814                         IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2815                 return -EINVAL;
2816         }
2817
2818         work->cm_event.private_data =
2819                 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2820
2821         spin_lock_irq(&cm_id_priv->lock);
2822         if (cm_id_priv->local_qpn !=
2823             cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2824                 goto unlock;
2825
2826         switch (cm_id_priv->id.state) {
2827         case IB_CM_REP_SENT:
2828         case IB_CM_DREQ_SENT:
2829         case IB_CM_MRA_REP_RCVD:
2830                 ib_cancel_mad(cm_id_priv->msg);
2831                 break;
2832         case IB_CM_ESTABLISHED:
2833                 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2834                     cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2835                         ib_cancel_mad(cm_id_priv->msg);
2836                 break;
2837         case IB_CM_TIMEWAIT:
2838                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2839                                                      [CM_DREQ_COUNTER]);
2840                 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2841                 if (IS_ERR(msg))
2842                         goto unlock;
2843
2844                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2845                                cm_id_priv->private_data,
2846                                cm_id_priv->private_data_len);
2847                 spin_unlock_irq(&cm_id_priv->lock);
2848
2849                 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2850                     ib_post_send_mad(msg, NULL))
2851                         cm_free_response_msg(msg);
2852                 goto deref;
2853         case IB_CM_DREQ_RCVD:
2854                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2855                                                      [CM_DREQ_COUNTER]);
2856                 goto unlock;
2857         default:
2858                 trace_icm_dreq_unknown_err(&cm_id_priv->id);
2859                 goto unlock;
2860         }
2861         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2862         cm_id_priv->tid = dreq_msg->hdr.tid;
2863         cm_queue_work_unlock(cm_id_priv, work);
2864         return 0;
2865
2866 unlock: spin_unlock_irq(&cm_id_priv->lock);
2867 deref:  cm_deref_id(cm_id_priv);
2868         return -EINVAL;
2869 }
2870
2871 static int cm_drep_handler(struct cm_work *work)
2872 {
2873         struct cm_id_private *cm_id_priv;
2874         struct cm_drep_msg *drep_msg;
2875
2876         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2877         cm_id_priv = cm_acquire_id(
2878                 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2879                 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2880         if (!cm_id_priv)
2881                 return -EINVAL;
2882
2883         work->cm_event.private_data =
2884                 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2885
2886         spin_lock_irq(&cm_id_priv->lock);
2887         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2888             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2889                 spin_unlock_irq(&cm_id_priv->lock);
2890                 goto out;
2891         }
2892         cm_enter_timewait(cm_id_priv);
2893
2894         ib_cancel_mad(cm_id_priv->msg);
2895         cm_queue_work_unlock(cm_id_priv, work);
2896         return 0;
2897 out:
2898         cm_deref_id(cm_id_priv);
2899         return -EINVAL;
2900 }
2901
2902 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2903                               enum ib_cm_rej_reason reason, void *ari,
2904                               u8 ari_length, const void *private_data,
2905                               u8 private_data_len)
2906 {
2907         enum ib_cm_state state = cm_id_priv->id.state;
2908         struct ib_mad_send_buf *msg;
2909         int ret;
2910
2911         lockdep_assert_held(&cm_id_priv->lock);
2912
2913         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2914             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2915                 return -EINVAL;
2916
2917         switch (state) {
2918         case IB_CM_REQ_SENT:
2919         case IB_CM_MRA_REQ_RCVD:
2920         case IB_CM_REQ_RCVD:
2921         case IB_CM_MRA_REQ_SENT:
2922         case IB_CM_REP_RCVD:
2923         case IB_CM_MRA_REP_SENT:
2924                 cm_reset_to_idle(cm_id_priv);
2925                 msg = cm_alloc_msg(cm_id_priv);
2926                 if (IS_ERR(msg))
2927                         return PTR_ERR(msg);
2928                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2929                               ari, ari_length, private_data, private_data_len,
2930                               state);
2931                 break;
2932         case IB_CM_REP_SENT:
2933         case IB_CM_MRA_REP_RCVD:
2934                 cm_enter_timewait(cm_id_priv);
2935                 msg = cm_alloc_msg(cm_id_priv);
2936                 if (IS_ERR(msg))
2937                         return PTR_ERR(msg);
2938                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2939                               ari, ari_length, private_data, private_data_len,
2940                               state);
2941                 break;
2942         default:
2943                 trace_icm_send_unknown_rej_err(&cm_id_priv->id);
2944                 return -EINVAL;
2945         }
2946
2947         trace_icm_send_rej(&cm_id_priv->id, reason);
2948         ret = ib_post_send_mad(msg, NULL);
2949         if (ret) {
2950                 cm_free_msg(msg);
2951                 return ret;
2952         }
2953
2954         return 0;
2955 }
2956
2957 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2958                    void *ari, u8 ari_length, const void *private_data,
2959                    u8 private_data_len)
2960 {
2961         struct cm_id_private *cm_id_priv =
2962                 container_of(cm_id, struct cm_id_private, id);
2963         unsigned long flags;
2964         int ret;
2965
2966         spin_lock_irqsave(&cm_id_priv->lock, flags);
2967         ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2968                                  private_data, private_data_len);
2969         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2970         return ret;
2971 }
2972 EXPORT_SYMBOL(ib_send_cm_rej);
2973
2974 static void cm_format_rej_event(struct cm_work *work)
2975 {
2976         struct cm_rej_msg *rej_msg;
2977         struct ib_cm_rej_event_param *param;
2978
2979         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2980         param = &work->cm_event.param.rej_rcvd;
2981         param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2982         param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2983         param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2984         work->cm_event.private_data =
2985                 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2986 }
2987
2988 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2989 {
2990         struct cm_id_private *cm_id_priv;
2991         __be32 remote_id;
2992
2993         remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
2994
2995         if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
2996                 cm_id_priv = cm_find_remote_id(
2997                         *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
2998                         remote_id);
2999         } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3000                    CM_MSG_RESPONSE_REQ)
3001                 cm_id_priv = cm_acquire_id(
3002                         cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3003                         0);
3004         else
3005                 cm_id_priv = cm_acquire_id(
3006                         cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3007                         remote_id);
3008
3009         return cm_id_priv;
3010 }
3011
3012 static int cm_rej_handler(struct cm_work *work)
3013 {
3014         struct cm_id_private *cm_id_priv;
3015         struct cm_rej_msg *rej_msg;
3016
3017         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3018         cm_id_priv = cm_acquire_rejected_id(rej_msg);
3019         if (!cm_id_priv)
3020                 return -EINVAL;
3021
3022         cm_format_rej_event(work);
3023
3024         spin_lock_irq(&cm_id_priv->lock);
3025         switch (cm_id_priv->id.state) {
3026         case IB_CM_REQ_SENT:
3027         case IB_CM_MRA_REQ_RCVD:
3028         case IB_CM_REP_SENT:
3029         case IB_CM_MRA_REP_RCVD:
3030                 ib_cancel_mad(cm_id_priv->msg);
3031                 fallthrough;
3032         case IB_CM_REQ_RCVD:
3033         case IB_CM_MRA_REQ_SENT:
3034                 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3035                         cm_enter_timewait(cm_id_priv);
3036                 else
3037                         cm_reset_to_idle(cm_id_priv);
3038                 break;
3039         case IB_CM_DREQ_SENT:
3040                 ib_cancel_mad(cm_id_priv->msg);
3041                 fallthrough;
3042         case IB_CM_REP_RCVD:
3043         case IB_CM_MRA_REP_SENT:
3044                 cm_enter_timewait(cm_id_priv);
3045                 break;
3046         case IB_CM_ESTABLISHED:
3047                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3048                     cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3049                         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3050                                 ib_cancel_mad(cm_id_priv->msg);
3051                         cm_enter_timewait(cm_id_priv);
3052                         break;
3053                 }
3054                 fallthrough;
3055         default:
3056                 trace_icm_rej_unknown_err(&cm_id_priv->id);
3057                 spin_unlock_irq(&cm_id_priv->lock);
3058                 goto out;
3059         }
3060
3061         cm_queue_work_unlock(cm_id_priv, work);
3062         return 0;
3063 out:
3064         cm_deref_id(cm_id_priv);
3065         return -EINVAL;
3066 }
3067
3068 int ib_send_cm_mra(struct ib_cm_id *cm_id,
3069                    u8 service_timeout,
3070                    const void *private_data,
3071                    u8 private_data_len)
3072 {
3073         struct cm_id_private *cm_id_priv;
3074         struct ib_mad_send_buf *msg;
3075         enum ib_cm_state cm_state;
3076         enum ib_cm_lap_state lap_state;
3077         enum cm_msg_response msg_response;
3078         void *data;
3079         unsigned long flags;
3080         int ret;
3081
3082         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3083                 return -EINVAL;
3084
3085         data = cm_copy_private_data(private_data, private_data_len);
3086         if (IS_ERR(data))
3087                 return PTR_ERR(data);
3088
3089         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3090
3091         spin_lock_irqsave(&cm_id_priv->lock, flags);
3092         switch (cm_id_priv->id.state) {
3093         case IB_CM_REQ_RCVD:
3094                 cm_state = IB_CM_MRA_REQ_SENT;
3095                 lap_state = cm_id->lap_state;
3096                 msg_response = CM_MSG_RESPONSE_REQ;
3097                 break;
3098         case IB_CM_REP_RCVD:
3099                 cm_state = IB_CM_MRA_REP_SENT;
3100                 lap_state = cm_id->lap_state;
3101                 msg_response = CM_MSG_RESPONSE_REP;
3102                 break;
3103         case IB_CM_ESTABLISHED:
3104                 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3105                         cm_state = cm_id->state;
3106                         lap_state = IB_CM_MRA_LAP_SENT;
3107                         msg_response = CM_MSG_RESPONSE_OTHER;
3108                         break;
3109                 }
3110                 fallthrough;
3111         default:
3112                 trace_icm_send_mra_unknown_err(&cm_id_priv->id);
3113                 ret = -EINVAL;
3114                 goto error_unlock;
3115         }
3116
3117         if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3118                 msg = cm_alloc_msg(cm_id_priv);
3119                 if (IS_ERR(msg)) {
3120                         ret = PTR_ERR(msg);
3121                         goto error_unlock;
3122                 }
3123
3124                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3125                               msg_response, service_timeout,
3126                               private_data, private_data_len);
3127                 trace_icm_send_mra(cm_id);
3128                 ret = ib_post_send_mad(msg, NULL);
3129                 if (ret)
3130                         goto error_free_msg;
3131         }
3132
3133         cm_id->state = cm_state;
3134         cm_id->lap_state = lap_state;
3135         cm_id_priv->service_timeout = service_timeout;
3136         cm_set_private_data(cm_id_priv, data, private_data_len);
3137         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3138         return 0;
3139
3140 error_free_msg:
3141         cm_free_msg(msg);
3142 error_unlock:
3143         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3144         kfree(data);
3145         return ret;
3146 }
3147 EXPORT_SYMBOL(ib_send_cm_mra);
3148
3149 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3150 {
3151         switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3152         case CM_MSG_RESPONSE_REQ:
3153                 return cm_acquire_id(
3154                         cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3155                         0);
3156         case CM_MSG_RESPONSE_REP:
3157         case CM_MSG_RESPONSE_OTHER:
3158                 return cm_acquire_id(
3159                         cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3160                         cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3161         default:
3162                 return NULL;
3163         }
3164 }
3165
3166 static int cm_mra_handler(struct cm_work *work)
3167 {
3168         struct cm_id_private *cm_id_priv;
3169         struct cm_mra_msg *mra_msg;
3170         int timeout;
3171
3172         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3173         cm_id_priv = cm_acquire_mraed_id(mra_msg);
3174         if (!cm_id_priv)
3175                 return -EINVAL;
3176
3177         work->cm_event.private_data =
3178                 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3179         work->cm_event.param.mra_rcvd.service_timeout =
3180                 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3181         timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3182                   cm_convert_to_ms(cm_id_priv->av.timeout);
3183
3184         spin_lock_irq(&cm_id_priv->lock);
3185         switch (cm_id_priv->id.state) {
3186         case IB_CM_REQ_SENT:
3187                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3188                             CM_MSG_RESPONSE_REQ ||
3189                     ib_modify_mad(cm_id_priv->msg, timeout))
3190                         goto out;
3191                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3192                 break;
3193         case IB_CM_REP_SENT:
3194                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3195                             CM_MSG_RESPONSE_REP ||
3196                     ib_modify_mad(cm_id_priv->msg, timeout))
3197                         goto out;
3198                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3199                 break;
3200         case IB_CM_ESTABLISHED:
3201                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3202                             CM_MSG_RESPONSE_OTHER ||
3203                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3204                     ib_modify_mad(cm_id_priv->msg, timeout)) {
3205                         if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3206                                 atomic_long_inc(
3207                                         &work->port->counters[CM_RECV_DUPLICATES]
3208                                                              [CM_MRA_COUNTER]);
3209                         goto out;
3210                 }
3211                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3212                 break;
3213         case IB_CM_MRA_REQ_RCVD:
3214         case IB_CM_MRA_REP_RCVD:
3215                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3216                                                      [CM_MRA_COUNTER]);
3217                 fallthrough;
3218         default:
3219                 trace_icm_mra_unknown_err(&cm_id_priv->id);
3220                 goto out;
3221         }
3222
3223         cm_id_priv->msg->context[1] = (void *) (unsigned long)
3224                                       cm_id_priv->id.state;
3225         cm_queue_work_unlock(cm_id_priv, work);
3226         return 0;
3227 out:
3228         spin_unlock_irq(&cm_id_priv->lock);
3229         cm_deref_id(cm_id_priv);
3230         return -EINVAL;
3231 }
3232
3233 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3234                                         struct sa_path_rec *path)
3235 {
3236         u32 lid;
3237
3238         if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3239                 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3240                                                lap_msg));
3241                 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3242                                                lap_msg));
3243         } else {
3244                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3245                         CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3246                 sa_path_set_dlid(path, lid);
3247
3248                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3249                         CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3250                 sa_path_set_slid(path, lid);
3251         }
3252 }
3253
3254 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3255                                     struct sa_path_rec *path,
3256                                     struct cm_lap_msg *lap_msg)
3257 {
3258         path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3259         path->sgid =
3260                 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3261         path->flow_label =
3262                 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3263         path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3264         path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3265         path->reversible = 1;
3266         path->pkey = cm_id_priv->pkey;
3267         path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3268         path->mtu_selector = IB_SA_EQ;
3269         path->mtu = cm_id_priv->path_mtu;
3270         path->rate_selector = IB_SA_EQ;
3271         path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3272         path->packet_life_time_selector = IB_SA_EQ;
3273         path->packet_life_time =
3274                 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3275         path->packet_life_time -= (path->packet_life_time > 0);
3276         cm_format_path_lid_from_lap(lap_msg, path);
3277 }
3278
3279 static int cm_lap_handler(struct cm_work *work)
3280 {
3281         struct cm_id_private *cm_id_priv;
3282         struct cm_lap_msg *lap_msg;
3283         struct ib_cm_lap_event_param *param;
3284         struct ib_mad_send_buf *msg = NULL;
3285         struct rdma_ah_attr ah_attr;
3286         struct cm_av alt_av = {};
3287         int ret;
3288
3289         /* Currently Alternate path messages are not supported for
3290          * RoCE link layer.
3291          */
3292         if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3293                                work->port->port_num))
3294                 return -EINVAL;
3295
3296         /* todo: verify LAP request and send reject APR if invalid. */
3297         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3298         cm_id_priv = cm_acquire_id(
3299                 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3300                 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3301         if (!cm_id_priv)
3302                 return -EINVAL;
3303
3304         param = &work->cm_event.param.lap_rcvd;
3305         memset(&work->path[0], 0, sizeof(work->path[1]));
3306         cm_path_set_rec_type(work->port->cm_dev->ib_device,
3307                              work->port->port_num, &work->path[0],
3308                              IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3309                                              lap_msg));
3310         param->alternate_path = &work->path[0];
3311         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3312         work->cm_event.private_data =
3313                 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3314
3315         ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device,
3316                                       work->port->port_num,
3317                                       work->mad_recv_wc->wc,
3318                                       work->mad_recv_wc->recv_buf.grh,
3319                                       &ah_attr);
3320         if (ret)
3321                 goto deref;
3322
3323         ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av);
3324         if (ret) {
3325                 rdma_destroy_ah_attr(&ah_attr);
3326                 goto deref;
3327         }
3328
3329         spin_lock_irq(&cm_id_priv->lock);
3330         cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3331                            &ah_attr, &cm_id_priv->av);
3332         cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
3333
3334         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3335                 goto unlock;
3336
3337         switch (cm_id_priv->id.lap_state) {
3338         case IB_CM_LAP_UNINIT:
3339         case IB_CM_LAP_IDLE:
3340                 break;
3341         case IB_CM_MRA_LAP_SENT:
3342                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3343                                                      [CM_LAP_COUNTER]);
3344                 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3345                 if (IS_ERR(msg))
3346                         goto unlock;
3347
3348                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3349                               CM_MSG_RESPONSE_OTHER,
3350                               cm_id_priv->service_timeout,
3351                               cm_id_priv->private_data,
3352                               cm_id_priv->private_data_len);
3353                 spin_unlock_irq(&cm_id_priv->lock);
3354
3355                 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3356                     ib_post_send_mad(msg, NULL))
3357                         cm_free_response_msg(msg);
3358                 goto deref;
3359         case IB_CM_LAP_RCVD:
3360                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3361                                                      [CM_LAP_COUNTER]);
3362                 goto unlock;
3363         default:
3364                 goto unlock;
3365         }
3366
3367         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3368         cm_id_priv->tid = lap_msg->hdr.tid;
3369         cm_queue_work_unlock(cm_id_priv, work);
3370         return 0;
3371
3372 unlock: spin_unlock_irq(&cm_id_priv->lock);
3373 deref:  cm_deref_id(cm_id_priv);
3374         return -EINVAL;
3375 }
3376
3377 static int cm_apr_handler(struct cm_work *work)
3378 {
3379         struct cm_id_private *cm_id_priv;
3380         struct cm_apr_msg *apr_msg;
3381
3382         /* Currently Alternate path messages are not supported for
3383          * RoCE link layer.
3384          */
3385         if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3386                                work->port->port_num))
3387                 return -EINVAL;
3388
3389         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3390         cm_id_priv = cm_acquire_id(
3391                 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3392                 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3393         if (!cm_id_priv)
3394                 return -EINVAL; /* Unmatched reply. */
3395
3396         work->cm_event.param.apr_rcvd.ap_status =
3397                 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3398         work->cm_event.param.apr_rcvd.apr_info =
3399                 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3400         work->cm_event.param.apr_rcvd.info_len =
3401                 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3402         work->cm_event.private_data =
3403                 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3404
3405         spin_lock_irq(&cm_id_priv->lock);
3406         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3407             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3408              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3409                 spin_unlock_irq(&cm_id_priv->lock);
3410                 goto out;
3411         }
3412         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3413         ib_cancel_mad(cm_id_priv->msg);
3414         cm_queue_work_unlock(cm_id_priv, work);
3415         return 0;
3416 out:
3417         cm_deref_id(cm_id_priv);
3418         return -EINVAL;
3419 }
3420
3421 static int cm_timewait_handler(struct cm_work *work)
3422 {
3423         struct cm_timewait_info *timewait_info;
3424         struct cm_id_private *cm_id_priv;
3425
3426         timewait_info = container_of(work, struct cm_timewait_info, work);
3427         spin_lock_irq(&cm.lock);
3428         list_del(&timewait_info->list);
3429         spin_unlock_irq(&cm.lock);
3430
3431         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3432                                    timewait_info->work.remote_id);
3433         if (!cm_id_priv)
3434                 return -EINVAL;
3435
3436         spin_lock_irq(&cm_id_priv->lock);
3437         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3438             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3439                 spin_unlock_irq(&cm_id_priv->lock);
3440                 goto out;
3441         }
3442         cm_id_priv->id.state = IB_CM_IDLE;
3443         cm_queue_work_unlock(cm_id_priv, work);
3444         return 0;
3445 out:
3446         cm_deref_id(cm_id_priv);
3447         return -EINVAL;
3448 }
3449
3450 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3451                                struct cm_id_private *cm_id_priv,
3452                                struct ib_cm_sidr_req_param *param)
3453 {
3454         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3455                           cm_form_tid(cm_id_priv));
3456         IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3457                 be32_to_cpu(cm_id_priv->id.local_id));
3458         IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3459                 be16_to_cpu(param->path->pkey));
3460         IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3461                 be64_to_cpu(param->service_id));
3462
3463         if (param->private_data && param->private_data_len)
3464                 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3465                             param->private_data, param->private_data_len);
3466 }
3467
3468 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3469                         struct ib_cm_sidr_req_param *param)
3470 {
3471         struct cm_id_private *cm_id_priv;
3472         struct ib_mad_send_buf *msg;
3473         struct cm_av av = {};
3474         unsigned long flags;
3475         int ret;
3476
3477         if (!param->path || (param->private_data &&
3478              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3479                 return -EINVAL;
3480
3481         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3482         ret = cm_init_av_by_path(param->path, param->sgid_attr, &av);
3483         if (ret)
3484                 return ret;
3485
3486         spin_lock_irqsave(&cm_id_priv->lock, flags);
3487         cm_move_av_from_path(&cm_id_priv->av, &av);
3488         cm_id->service_id = param->service_id;
3489         cm_id->service_mask = ~cpu_to_be64(0);
3490         cm_id_priv->timeout_ms = param->timeout_ms;
3491         cm_id_priv->max_cm_retries = param->max_cm_retries;
3492         if (cm_id->state != IB_CM_IDLE) {
3493                 ret = -EINVAL;
3494                 goto out_unlock;
3495         }
3496
3497         msg = cm_alloc_priv_msg(cm_id_priv);
3498         if (IS_ERR(msg)) {
3499                 ret = PTR_ERR(msg);
3500                 goto out_unlock;
3501         }
3502
3503         cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv,
3504                            param);
3505         msg->timeout_ms = cm_id_priv->timeout_ms;
3506         msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT;
3507
3508         trace_icm_send_sidr_req(&cm_id_priv->id);
3509         ret = ib_post_send_mad(msg, NULL);
3510         if (ret)
3511                 goto out_free;
3512         cm_id->state = IB_CM_SIDR_REQ_SENT;
3513         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3514         return 0;
3515 out_free:
3516         cm_free_priv_msg(msg);
3517 out_unlock:
3518         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3519         return ret;
3520 }
3521 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3522
3523 static void cm_format_sidr_req_event(struct cm_work *work,
3524                                      const struct cm_id_private *rx_cm_id,
3525                                      struct ib_cm_id *listen_id)
3526 {
3527         struct cm_sidr_req_msg *sidr_req_msg;
3528         struct ib_cm_sidr_req_event_param *param;
3529
3530         sidr_req_msg = (struct cm_sidr_req_msg *)
3531                                 work->mad_recv_wc->recv_buf.mad;
3532         param = &work->cm_event.param.sidr_req_rcvd;
3533         param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3534         param->listen_id = listen_id;
3535         param->service_id =
3536                 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3537         param->bth_pkey = cm_get_bth_pkey(work);
3538         param->port = work->port->port_num;
3539         param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3540         work->cm_event.private_data =
3541                 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3542 }
3543
3544 static int cm_sidr_req_handler(struct cm_work *work)
3545 {
3546         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3547         struct cm_sidr_req_msg *sidr_req_msg;
3548         struct ib_wc *wc;
3549         int ret;
3550
3551         cm_id_priv =
3552                 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3553         if (IS_ERR(cm_id_priv))
3554                 return PTR_ERR(cm_id_priv);
3555
3556         /* Record SGID/SLID and request ID for lookup. */
3557         sidr_req_msg = (struct cm_sidr_req_msg *)
3558                                 work->mad_recv_wc->recv_buf.mad;
3559
3560         cm_id_priv->id.remote_id =
3561                 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3562         cm_id_priv->id.service_id =
3563                 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3564         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3565         cm_id_priv->tid = sidr_req_msg->hdr.tid;
3566
3567         wc = work->mad_recv_wc->wc;
3568         cm_id_priv->sidr_slid = wc->slid;
3569         ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3570                                       work->mad_recv_wc->recv_buf.grh,
3571                                       &cm_id_priv->av);
3572         if (ret)
3573                 goto out;
3574
3575         spin_lock_irq(&cm.lock);
3576         listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3577         if (listen_cm_id_priv) {
3578                 spin_unlock_irq(&cm.lock);
3579                 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3580                                                      [CM_SIDR_REQ_COUNTER]);
3581                 goto out; /* Duplicate message. */
3582         }
3583         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3584         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3585                                            cm_id_priv->id.service_id);
3586         if (!listen_cm_id_priv) {
3587                 spin_unlock_irq(&cm.lock);
3588                 ib_send_cm_sidr_rep(&cm_id_priv->id,
3589                                     &(struct ib_cm_sidr_rep_param){
3590                                             .status = IB_SIDR_UNSUPPORTED });
3591                 goto out; /* No match. */
3592         }
3593         spin_unlock_irq(&cm.lock);
3594
3595         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3596         cm_id_priv->id.context = listen_cm_id_priv->id.context;
3597
3598         /*
3599          * A SIDR ID does not need to be in the xarray since it does not receive
3600          * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3601          * not enter timewait.
3602          */
3603
3604         cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3605         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3606         cm_free_work(work);
3607         /*
3608          * A pointer to the listen_cm_id is held in the event, so this deref
3609          * must be after the event is delivered above.
3610          */
3611         cm_deref_id(listen_cm_id_priv);
3612         if (ret)
3613                 cm_destroy_id(&cm_id_priv->id, ret);
3614         return 0;
3615 out:
3616         ib_destroy_cm_id(&cm_id_priv->id);
3617         return -EINVAL;
3618 }
3619
3620 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3621                                struct cm_id_private *cm_id_priv,
3622                                struct ib_cm_sidr_rep_param *param)
3623 {
3624         cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3625                               cm_id_priv->tid, param->ece.attr_mod);
3626         IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3627                 be32_to_cpu(cm_id_priv->id.remote_id));
3628         IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3629         IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3630         IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3631                 be64_to_cpu(cm_id_priv->id.service_id));
3632         IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3633         IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3634                 param->ece.vendor_id & 0xFF);
3635         IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3636                 (param->ece.vendor_id >> 8) & 0xFF);
3637
3638         if (param->info && param->info_length)
3639                 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3640                             param->info, param->info_length);
3641
3642         if (param->private_data && param->private_data_len)
3643                 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3644                             param->private_data, param->private_data_len);
3645 }
3646
3647 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3648                                    struct ib_cm_sidr_rep_param *param)
3649 {
3650         struct ib_mad_send_buf *msg;
3651         unsigned long flags;
3652         int ret;
3653
3654         lockdep_assert_held(&cm_id_priv->lock);
3655
3656         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3657             (param->private_data &&
3658              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3659                 return -EINVAL;
3660
3661         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3662                 return -EINVAL;
3663
3664         msg = cm_alloc_msg(cm_id_priv);
3665         if (IS_ERR(msg))
3666                 return PTR_ERR(msg);
3667
3668         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3669                            param);
3670         trace_icm_send_sidr_rep(&cm_id_priv->id);
3671         ret = ib_post_send_mad(msg, NULL);
3672         if (ret) {
3673                 cm_free_msg(msg);
3674                 return ret;
3675         }
3676         cm_id_priv->id.state = IB_CM_IDLE;
3677         spin_lock_irqsave(&cm.lock, flags);
3678         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3679                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3680                 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3681         }
3682         spin_unlock_irqrestore(&cm.lock, flags);
3683         return 0;
3684 }
3685
3686 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3687                         struct ib_cm_sidr_rep_param *param)
3688 {
3689         struct cm_id_private *cm_id_priv =
3690                 container_of(cm_id, struct cm_id_private, id);
3691         unsigned long flags;
3692         int ret;
3693
3694         spin_lock_irqsave(&cm_id_priv->lock, flags);
3695         ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3696         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3697         return ret;
3698 }
3699 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3700
3701 static void cm_format_sidr_rep_event(struct cm_work *work,
3702                                      const struct cm_id_private *cm_id_priv)
3703 {
3704         struct cm_sidr_rep_msg *sidr_rep_msg;
3705         struct ib_cm_sidr_rep_event_param *param;
3706
3707         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3708                                 work->mad_recv_wc->recv_buf.mad;
3709         param = &work->cm_event.param.sidr_rep_rcvd;
3710         param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3711         param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3712         param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3713         param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3714                                       sidr_rep_msg);
3715         param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3716                                   sidr_rep_msg);
3717         param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3718         work->cm_event.private_data =
3719                 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3720 }
3721
3722 static int cm_sidr_rep_handler(struct cm_work *work)
3723 {
3724         struct cm_sidr_rep_msg *sidr_rep_msg;
3725         struct cm_id_private *cm_id_priv;
3726
3727         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3728                                 work->mad_recv_wc->recv_buf.mad;
3729         cm_id_priv = cm_acquire_id(
3730                 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3731         if (!cm_id_priv)
3732                 return -EINVAL; /* Unmatched reply. */
3733
3734         spin_lock_irq(&cm_id_priv->lock);
3735         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3736                 spin_unlock_irq(&cm_id_priv->lock);
3737                 goto out;
3738         }
3739         cm_id_priv->id.state = IB_CM_IDLE;
3740         ib_cancel_mad(cm_id_priv->msg);
3741         spin_unlock_irq(&cm_id_priv->lock);
3742
3743         cm_format_sidr_rep_event(work, cm_id_priv);
3744         cm_process_work(cm_id_priv, work);
3745         return 0;
3746 out:
3747         cm_deref_id(cm_id_priv);
3748         return -EINVAL;
3749 }
3750
3751 static void cm_process_send_error(struct cm_id_private *cm_id_priv,
3752                                   struct ib_mad_send_buf *msg,
3753                                   enum ib_cm_state state,
3754                                   enum ib_wc_status wc_status)
3755 {
3756         struct ib_cm_event cm_event = {};
3757         int ret;
3758
3759         /* Discard old sends or ones without a response. */
3760         spin_lock_irq(&cm_id_priv->lock);
3761         if (msg != cm_id_priv->msg) {
3762                 spin_unlock_irq(&cm_id_priv->lock);
3763                 cm_free_msg(msg);
3764                 return;
3765         }
3766         cm_free_priv_msg(msg);
3767
3768         if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS ||
3769             wc_status == IB_WC_WR_FLUSH_ERR)
3770                 goto out_unlock;
3771
3772         trace_icm_mad_send_err(state, wc_status);
3773         switch (state) {
3774         case IB_CM_REQ_SENT:
3775         case IB_CM_MRA_REQ_RCVD:
3776                 cm_reset_to_idle(cm_id_priv);
3777                 cm_event.event = IB_CM_REQ_ERROR;
3778                 break;
3779         case IB_CM_REP_SENT:
3780         case IB_CM_MRA_REP_RCVD:
3781                 cm_reset_to_idle(cm_id_priv);
3782                 cm_event.event = IB_CM_REP_ERROR;
3783                 break;
3784         case IB_CM_DREQ_SENT:
3785                 cm_enter_timewait(cm_id_priv);
3786                 cm_event.event = IB_CM_DREQ_ERROR;
3787                 break;
3788         case IB_CM_SIDR_REQ_SENT:
3789                 cm_id_priv->id.state = IB_CM_IDLE;
3790                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3791                 break;
3792         default:
3793                 goto out_unlock;
3794         }
3795         spin_unlock_irq(&cm_id_priv->lock);
3796         cm_event.param.send_status = wc_status;
3797
3798         /* No other events can occur on the cm_id at this point. */
3799         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3800         if (ret)
3801                 ib_destroy_cm_id(&cm_id_priv->id);
3802         return;
3803 out_unlock:
3804         spin_unlock_irq(&cm_id_priv->lock);
3805 }
3806
3807 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3808                             struct ib_mad_send_wc *mad_send_wc)
3809 {
3810         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3811         struct cm_id_private *cm_id_priv = msg->context[0];
3812         enum ib_cm_state state =
3813                 (enum ib_cm_state)(unsigned long)msg->context[1];
3814         struct cm_port *port;
3815         u16 attr_index;
3816
3817         port = mad_agent->context;
3818         attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3819                                   msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3820
3821         /*
3822          * If the send was in response to a received message (context[0] is not
3823          * set to a cm_id), and is not a REJ, then it is a send that was
3824          * manually retried.
3825          */
3826         if (!cm_id_priv && (attr_index != CM_REJ_COUNTER))
3827                 msg->retries = 1;
3828
3829         atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]);
3830         if (msg->retries)
3831                 atomic_long_add(msg->retries,
3832                                 &port->counters[CM_XMIT_RETRIES][attr_index]);
3833
3834         if (cm_id_priv)
3835                 cm_process_send_error(cm_id_priv, msg, state,
3836                                       mad_send_wc->status);
3837         else
3838                 cm_free_response_msg(msg);
3839 }
3840
3841 static void cm_work_handler(struct work_struct *_work)
3842 {
3843         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3844         int ret;
3845
3846         switch (work->cm_event.event) {
3847         case IB_CM_REQ_RECEIVED:
3848                 ret = cm_req_handler(work);
3849                 break;
3850         case IB_CM_MRA_RECEIVED:
3851                 ret = cm_mra_handler(work);
3852                 break;
3853         case IB_CM_REJ_RECEIVED:
3854                 ret = cm_rej_handler(work);
3855                 break;
3856         case IB_CM_REP_RECEIVED:
3857                 ret = cm_rep_handler(work);
3858                 break;
3859         case IB_CM_RTU_RECEIVED:
3860                 ret = cm_rtu_handler(work);
3861                 break;
3862         case IB_CM_USER_ESTABLISHED:
3863                 ret = cm_establish_handler(work);
3864                 break;
3865         case IB_CM_DREQ_RECEIVED:
3866                 ret = cm_dreq_handler(work);
3867                 break;
3868         case IB_CM_DREP_RECEIVED:
3869                 ret = cm_drep_handler(work);
3870                 break;
3871         case IB_CM_SIDR_REQ_RECEIVED:
3872                 ret = cm_sidr_req_handler(work);
3873                 break;
3874         case IB_CM_SIDR_REP_RECEIVED:
3875                 ret = cm_sidr_rep_handler(work);
3876                 break;
3877         case IB_CM_LAP_RECEIVED:
3878                 ret = cm_lap_handler(work);
3879                 break;
3880         case IB_CM_APR_RECEIVED:
3881                 ret = cm_apr_handler(work);
3882                 break;
3883         case IB_CM_TIMEWAIT_EXIT:
3884                 ret = cm_timewait_handler(work);
3885                 break;
3886         default:
3887                 trace_icm_handler_err(work->cm_event.event);
3888                 ret = -EINVAL;
3889                 break;
3890         }
3891         if (ret)
3892                 cm_free_work(work);
3893 }
3894
3895 static int cm_establish(struct ib_cm_id *cm_id)
3896 {
3897         struct cm_id_private *cm_id_priv;
3898         struct cm_work *work;
3899         unsigned long flags;
3900         int ret = 0;
3901         struct cm_device *cm_dev;
3902
3903         cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3904         if (!cm_dev)
3905                 return -ENODEV;
3906
3907         work = kmalloc(sizeof *work, GFP_ATOMIC);
3908         if (!work)
3909                 return -ENOMEM;
3910
3911         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3912         spin_lock_irqsave(&cm_id_priv->lock, flags);
3913         switch (cm_id->state) {
3914         case IB_CM_REP_SENT:
3915         case IB_CM_MRA_REP_RCVD:
3916                 cm_id->state = IB_CM_ESTABLISHED;
3917                 break;
3918         case IB_CM_ESTABLISHED:
3919                 ret = -EISCONN;
3920                 break;
3921         default:
3922                 trace_icm_establish_err(cm_id);
3923                 ret = -EINVAL;
3924                 break;
3925         }
3926         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3927
3928         if (ret) {
3929                 kfree(work);
3930                 goto out;
3931         }
3932
3933         /*
3934          * The CM worker thread may try to destroy the cm_id before it
3935          * can execute this work item.  To prevent potential deadlock,
3936          * we need to find the cm_id once we're in the context of the
3937          * worker thread, rather than holding a reference on it.
3938          */
3939         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3940         work->local_id = cm_id->local_id;
3941         work->remote_id = cm_id->remote_id;
3942         work->mad_recv_wc = NULL;
3943         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3944
3945         /* Check if the device started its remove_one */
3946         spin_lock_irqsave(&cm.lock, flags);
3947         if (!cm_dev->going_down) {
3948                 queue_delayed_work(cm.wq, &work->work, 0);
3949         } else {
3950                 kfree(work);
3951                 ret = -ENODEV;
3952         }
3953         spin_unlock_irqrestore(&cm.lock, flags);
3954
3955 out:
3956         return ret;
3957 }
3958
3959 static int cm_migrate(struct ib_cm_id *cm_id)
3960 {
3961         struct cm_id_private *cm_id_priv;
3962         unsigned long flags;
3963         int ret = 0;
3964
3965         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3966         spin_lock_irqsave(&cm_id_priv->lock, flags);
3967         if (cm_id->state == IB_CM_ESTABLISHED &&
3968             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3969              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3970                 cm_id->lap_state = IB_CM_LAP_IDLE;
3971                 cm_id_priv->av = cm_id_priv->alt_av;
3972         } else
3973                 ret = -EINVAL;
3974         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3975
3976         return ret;
3977 }
3978
3979 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3980 {
3981         int ret;
3982
3983         switch (event) {
3984         case IB_EVENT_COMM_EST:
3985                 ret = cm_establish(cm_id);
3986                 break;
3987         case IB_EVENT_PATH_MIG:
3988                 ret = cm_migrate(cm_id);
3989                 break;
3990         default:
3991                 ret = -EINVAL;
3992         }
3993         return ret;
3994 }
3995 EXPORT_SYMBOL(ib_cm_notify);
3996
3997 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3998                             struct ib_mad_send_buf *send_buf,
3999                             struct ib_mad_recv_wc *mad_recv_wc)
4000 {
4001         struct cm_port *port = mad_agent->context;
4002         struct cm_work *work;
4003         enum ib_cm_event_type event;
4004         bool alt_path = false;
4005         u16 attr_id;
4006         int paths = 0;
4007         int going_down = 0;
4008
4009         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4010         case CM_REQ_ATTR_ID:
4011                 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4012                                                 mad_recv_wc->recv_buf.mad);
4013                 paths = 1 + (alt_path != 0);
4014                 event = IB_CM_REQ_RECEIVED;
4015                 break;
4016         case CM_MRA_ATTR_ID:
4017                 event = IB_CM_MRA_RECEIVED;
4018                 break;
4019         case CM_REJ_ATTR_ID:
4020                 event = IB_CM_REJ_RECEIVED;
4021                 break;
4022         case CM_REP_ATTR_ID:
4023                 event = IB_CM_REP_RECEIVED;
4024                 break;
4025         case CM_RTU_ATTR_ID:
4026                 event = IB_CM_RTU_RECEIVED;
4027                 break;
4028         case CM_DREQ_ATTR_ID:
4029                 event = IB_CM_DREQ_RECEIVED;
4030                 break;
4031         case CM_DREP_ATTR_ID:
4032                 event = IB_CM_DREP_RECEIVED;
4033                 break;
4034         case CM_SIDR_REQ_ATTR_ID:
4035                 event = IB_CM_SIDR_REQ_RECEIVED;
4036                 break;
4037         case CM_SIDR_REP_ATTR_ID:
4038                 event = IB_CM_SIDR_REP_RECEIVED;
4039                 break;
4040         case CM_LAP_ATTR_ID:
4041                 paths = 1;
4042                 event = IB_CM_LAP_RECEIVED;
4043                 break;
4044         case CM_APR_ATTR_ID:
4045                 event = IB_CM_APR_RECEIVED;
4046                 break;
4047         default:
4048                 ib_free_recv_mad(mad_recv_wc);
4049                 return;
4050         }
4051
4052         attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4053         atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]);
4054
4055         work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4056         if (!work) {
4057                 ib_free_recv_mad(mad_recv_wc);
4058                 return;
4059         }
4060
4061         INIT_DELAYED_WORK(&work->work, cm_work_handler);
4062         work->cm_event.event = event;
4063         work->mad_recv_wc = mad_recv_wc;
4064         work->port = port;
4065
4066         /* Check if the device started its remove_one */
4067         spin_lock_irq(&cm.lock);
4068         if (!port->cm_dev->going_down)
4069                 queue_delayed_work(cm.wq, &work->work, 0);
4070         else
4071                 going_down = 1;
4072         spin_unlock_irq(&cm.lock);
4073
4074         if (going_down) {
4075                 kfree(work);
4076                 ib_free_recv_mad(mad_recv_wc);
4077         }
4078 }
4079
4080 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4081                                 struct ib_qp_attr *qp_attr,
4082                                 int *qp_attr_mask)
4083 {
4084         unsigned long flags;
4085         int ret;
4086
4087         spin_lock_irqsave(&cm_id_priv->lock, flags);
4088         switch (cm_id_priv->id.state) {
4089         case IB_CM_REQ_SENT:
4090         case IB_CM_MRA_REQ_RCVD:
4091         case IB_CM_REQ_RCVD:
4092         case IB_CM_MRA_REQ_SENT:
4093         case IB_CM_REP_RCVD:
4094         case IB_CM_MRA_REP_SENT:
4095         case IB_CM_REP_SENT:
4096         case IB_CM_MRA_REP_RCVD:
4097         case IB_CM_ESTABLISHED:
4098                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4099                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
4100                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4101                 if (cm_id_priv->responder_resources)
4102                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4103                                                     IB_ACCESS_REMOTE_ATOMIC;
4104                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4105                 if (cm_id_priv->av.port)
4106                         qp_attr->port_num = cm_id_priv->av.port->port_num;
4107                 ret = 0;
4108                 break;
4109         default:
4110                 trace_icm_qp_init_err(&cm_id_priv->id);
4111                 ret = -EINVAL;
4112                 break;
4113         }
4114         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4115         return ret;
4116 }
4117
4118 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4119                                struct ib_qp_attr *qp_attr,
4120                                int *qp_attr_mask)
4121 {
4122         unsigned long flags;
4123         int ret;
4124
4125         spin_lock_irqsave(&cm_id_priv->lock, flags);
4126         switch (cm_id_priv->id.state) {
4127         case IB_CM_REQ_RCVD:
4128         case IB_CM_MRA_REQ_SENT:
4129         case IB_CM_REP_RCVD:
4130         case IB_CM_MRA_REP_SENT:
4131         case IB_CM_REP_SENT:
4132         case IB_CM_MRA_REP_RCVD:
4133         case IB_CM_ESTABLISHED:
4134                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4135                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4136                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4137                 qp_attr->path_mtu = cm_id_priv->path_mtu;
4138                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4139                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4140                 if (cm_id_priv->qp_type == IB_QPT_RC ||
4141                     cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4142                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4143                                          IB_QP_MIN_RNR_TIMER;
4144                         qp_attr->max_dest_rd_atomic =
4145                                         cm_id_priv->responder_resources;
4146                         qp_attr->min_rnr_timer = 0;
4147                 }
4148                 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) &&
4149                     cm_id_priv->alt_av.port) {
4150                         *qp_attr_mask |= IB_QP_ALT_PATH;
4151                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4152                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4153                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4154                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4155                 }
4156                 ret = 0;
4157                 break;
4158         default:
4159                 trace_icm_qp_rtr_err(&cm_id_priv->id);
4160                 ret = -EINVAL;
4161                 break;
4162         }
4163         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4164         return ret;
4165 }
4166
4167 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4168                                struct ib_qp_attr *qp_attr,
4169                                int *qp_attr_mask)
4170 {
4171         unsigned long flags;
4172         int ret;
4173
4174         spin_lock_irqsave(&cm_id_priv->lock, flags);
4175         switch (cm_id_priv->id.state) {
4176         /* Allow transition to RTS before sending REP */
4177         case IB_CM_REQ_RCVD:
4178         case IB_CM_MRA_REQ_SENT:
4179
4180         case IB_CM_REP_RCVD:
4181         case IB_CM_MRA_REP_SENT:
4182         case IB_CM_REP_SENT:
4183         case IB_CM_MRA_REP_RCVD:
4184         case IB_CM_ESTABLISHED:
4185                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4186                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4187                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4188                         switch (cm_id_priv->qp_type) {
4189                         case IB_QPT_RC:
4190                         case IB_QPT_XRC_INI:
4191                                 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4192                                                  IB_QP_MAX_QP_RD_ATOMIC;
4193                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
4194                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4195                                 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4196                                 fallthrough;
4197                         case IB_QPT_XRC_TGT:
4198                                 *qp_attr_mask |= IB_QP_TIMEOUT;
4199                                 qp_attr->timeout = cm_id_priv->av.timeout;
4200                                 break;
4201                         default:
4202                                 break;
4203                         }
4204                         if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4205                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4206                                 qp_attr->path_mig_state = IB_MIG_REARM;
4207                         }
4208                 } else {
4209                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4210                         if (cm_id_priv->alt_av.port)
4211                                 qp_attr->alt_port_num =
4212                                         cm_id_priv->alt_av.port->port_num;
4213                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4214                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4215                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4216                         qp_attr->path_mig_state = IB_MIG_REARM;
4217                 }
4218                 ret = 0;
4219                 break;
4220         default:
4221                 trace_icm_qp_rts_err(&cm_id_priv->id);
4222                 ret = -EINVAL;
4223                 break;
4224         }
4225         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4226         return ret;
4227 }
4228
4229 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4230                        struct ib_qp_attr *qp_attr,
4231                        int *qp_attr_mask)
4232 {
4233         struct cm_id_private *cm_id_priv;
4234         int ret;
4235
4236         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4237         switch (qp_attr->qp_state) {
4238         case IB_QPS_INIT:
4239                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4240                 break;
4241         case IB_QPS_RTR:
4242                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4243                 break;
4244         case IB_QPS_RTS:
4245                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4246                 break;
4247         default:
4248                 ret = -EINVAL;
4249                 break;
4250         }
4251         return ret;
4252 }
4253 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4254
4255 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num,
4256                                struct ib_port_attribute *attr, char *buf)
4257 {
4258         struct cm_counter_attribute *cm_attr =
4259                 container_of(attr, struct cm_counter_attribute, attr);
4260         struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client);
4261
4262         if (WARN_ON(!cm_dev))
4263                 return -EINVAL;
4264
4265         return sysfs_emit(
4266                 buf, "%ld\n",
4267                 atomic_long_read(
4268                         &cm_dev->port[port_num - 1]
4269                                  ->counters[cm_attr->group][cm_attr->index]));
4270 }
4271
4272 #define CM_COUNTER_ATTR(_name, _group, _index)                                 \
4273         {                                                                      \
4274                 .attr = __ATTR(_name, 0444, cm_show_counter, NULL),            \
4275                 .group = _group, .index = _index                               \
4276         }
4277
4278 #define CM_COUNTER_GROUP(_group, _name)                                        \
4279         static struct cm_counter_attribute cm_counter_attr_##_group[] = {      \
4280                 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER),                  \
4281                 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER),                  \
4282                 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER),                  \
4283                 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER),                  \
4284                 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER),                  \
4285                 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER),                \
4286                 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER),                \
4287                 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER),        \
4288                 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER),        \
4289                 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER),                  \
4290                 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER),                  \
4291         };                                                                     \
4292         static struct attribute *cm_counter_attrs_##_group[] = {               \
4293                 &cm_counter_attr_##_group[0].attr.attr,                        \
4294                 &cm_counter_attr_##_group[1].attr.attr,                        \
4295                 &cm_counter_attr_##_group[2].attr.attr,                        \
4296                 &cm_counter_attr_##_group[3].attr.attr,                        \
4297                 &cm_counter_attr_##_group[4].attr.attr,                        \
4298                 &cm_counter_attr_##_group[5].attr.attr,                        \
4299                 &cm_counter_attr_##_group[6].attr.attr,                        \
4300                 &cm_counter_attr_##_group[7].attr.attr,                        \
4301                 &cm_counter_attr_##_group[8].attr.attr,                        \
4302                 &cm_counter_attr_##_group[9].attr.attr,                        \
4303                 &cm_counter_attr_##_group[10].attr.attr,                       \
4304                 NULL,                                                          \
4305         };                                                                     \
4306         static const struct attribute_group cm_counter_group_##_group = {      \
4307                 .name = _name,                                                 \
4308                 .attrs = cm_counter_attrs_##_group,                            \
4309         };
4310
4311 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs")
4312 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries")
4313 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs")
4314 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates")
4315
4316 static const struct attribute_group *cm_counter_groups[] = {
4317         &cm_counter_group_CM_XMIT,
4318         &cm_counter_group_CM_XMIT_RETRIES,
4319         &cm_counter_group_CM_RECV,
4320         &cm_counter_group_CM_RECV_DUPLICATES,
4321         NULL,
4322 };
4323
4324 static int cm_add_one(struct ib_device *ib_device)
4325 {
4326         struct cm_device *cm_dev;
4327         struct cm_port *port;
4328         struct ib_mad_reg_req reg_req = {
4329                 .mgmt_class = IB_MGMT_CLASS_CM,
4330                 .mgmt_class_version = IB_CM_CLASS_VERSION,
4331         };
4332         struct ib_port_modify port_modify = {
4333                 .set_port_cap_mask = IB_PORT_CM_SUP
4334         };
4335         unsigned long flags;
4336         int ret;
4337         int count = 0;
4338         u32 i;
4339
4340         cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4341                          GFP_KERNEL);
4342         if (!cm_dev)
4343                 return -ENOMEM;
4344
4345         kref_init(&cm_dev->kref);
4346         spin_lock_init(&cm_dev->mad_agent_lock);
4347         cm_dev->ib_device = ib_device;
4348         cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4349         cm_dev->going_down = 0;
4350
4351         ib_set_client_data(ib_device, &cm_client, cm_dev);
4352
4353         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4354         rdma_for_each_port (ib_device, i) {
4355                 if (!rdma_cap_ib_cm(ib_device, i))
4356                         continue;
4357
4358                 port = kzalloc(sizeof *port, GFP_KERNEL);
4359                 if (!port) {
4360                         ret = -ENOMEM;
4361                         goto error1;
4362                 }
4363
4364                 cm_dev->port[i-1] = port;
4365                 port->cm_dev = cm_dev;
4366                 port->port_num = i;
4367
4368                 ret = ib_port_register_client_groups(ib_device, i,
4369                                                      cm_counter_groups);
4370                 if (ret)
4371                         goto error1;
4372
4373                 port->mad_agent = ib_register_mad_agent(ib_device, i,
4374                                                         IB_QPT_GSI,
4375                                                         &reg_req,
4376                                                         0,
4377                                                         cm_send_handler,
4378                                                         cm_recv_handler,
4379                                                         port,
4380                                                         0);
4381                 if (IS_ERR(port->mad_agent)) {
4382                         ret = PTR_ERR(port->mad_agent);
4383                         goto error2;
4384                 }
4385
4386                 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4387                 if (ret)
4388                         goto error3;
4389
4390                 count++;
4391         }
4392
4393         if (!count) {
4394                 ret = -EOPNOTSUPP;
4395                 goto free;
4396         }
4397
4398         write_lock_irqsave(&cm.device_lock, flags);
4399         list_add_tail(&cm_dev->list, &cm.device_list);
4400         write_unlock_irqrestore(&cm.device_lock, flags);
4401         return 0;
4402
4403 error3:
4404         ib_unregister_mad_agent(port->mad_agent);
4405 error2:
4406         ib_port_unregister_client_groups(ib_device, i, cm_counter_groups);
4407 error1:
4408         port_modify.set_port_cap_mask = 0;
4409         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4410         while (--i) {
4411                 if (!rdma_cap_ib_cm(ib_device, i))
4412                         continue;
4413
4414                 port = cm_dev->port[i-1];
4415                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4416                 ib_unregister_mad_agent(port->mad_agent);
4417                 ib_port_unregister_client_groups(ib_device, i,
4418                                                  cm_counter_groups);
4419         }
4420 free:
4421         cm_device_put(cm_dev);
4422         return ret;
4423 }
4424
4425 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4426 {
4427         struct cm_device *cm_dev = client_data;
4428         struct cm_port *port;
4429         struct ib_port_modify port_modify = {
4430                 .clr_port_cap_mask = IB_PORT_CM_SUP
4431         };
4432         unsigned long flags;
4433         u32 i;
4434
4435         write_lock_irqsave(&cm.device_lock, flags);
4436         list_del(&cm_dev->list);
4437         write_unlock_irqrestore(&cm.device_lock, flags);
4438
4439         spin_lock_irq(&cm.lock);
4440         cm_dev->going_down = 1;
4441         spin_unlock_irq(&cm.lock);
4442
4443         rdma_for_each_port (ib_device, i) {
4444                 struct ib_mad_agent *mad_agent;
4445
4446                 if (!rdma_cap_ib_cm(ib_device, i))
4447                         continue;
4448
4449                 port = cm_dev->port[i-1];
4450                 mad_agent = port->mad_agent;
4451                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4452                 /*
4453                  * We flush the queue here after the going_down set, this
4454                  * verify that no new works will be queued in the recv handler,
4455                  * after that we can call the unregister_mad_agent
4456                  */
4457                 flush_workqueue(cm.wq);
4458                 /*
4459                  * The above ensures no call paths from the work are running,
4460                  * the remaining paths all take the mad_agent_lock.
4461                  */
4462                 spin_lock(&cm_dev->mad_agent_lock);
4463                 port->mad_agent = NULL;
4464                 spin_unlock(&cm_dev->mad_agent_lock);
4465                 ib_unregister_mad_agent(mad_agent);
4466                 ib_port_unregister_client_groups(ib_device, i,
4467                                                  cm_counter_groups);
4468         }
4469
4470         cm_device_put(cm_dev);
4471 }
4472
4473 static int __init ib_cm_init(void)
4474 {
4475         int ret;
4476
4477         INIT_LIST_HEAD(&cm.device_list);
4478         rwlock_init(&cm.device_lock);
4479         spin_lock_init(&cm.lock);
4480         cm.listen_service_table = RB_ROOT;
4481         cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4482         cm.remote_id_table = RB_ROOT;
4483         cm.remote_qp_table = RB_ROOT;
4484         cm.remote_sidr_table = RB_ROOT;
4485         xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC);
4486         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4487         INIT_LIST_HEAD(&cm.timewait_list);
4488
4489         cm.wq = alloc_workqueue("ib_cm", 0, 1);
4490         if (!cm.wq) {
4491                 ret = -ENOMEM;
4492                 goto error2;
4493         }
4494
4495         ret = ib_register_client(&cm_client);
4496         if (ret)
4497                 goto error3;
4498
4499         return 0;
4500 error3:
4501         destroy_workqueue(cm.wq);
4502 error2:
4503         return ret;
4504 }
4505
4506 static void __exit ib_cm_cleanup(void)
4507 {
4508         struct cm_timewait_info *timewait_info, *tmp;
4509
4510         spin_lock_irq(&cm.lock);
4511         list_for_each_entry(timewait_info, &cm.timewait_list, list)
4512                 cancel_delayed_work(&timewait_info->work.work);
4513         spin_unlock_irq(&cm.lock);
4514
4515         ib_unregister_client(&cm_client);
4516         destroy_workqueue(cm.wq);
4517
4518         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4519                 list_del(&timewait_info->list);
4520                 kfree(timewait_info);
4521         }
4522
4523         WARN_ON(!xa_empty(&cm.local_id_table));
4524 }
4525
4526 module_init(ib_cm_init);
4527 module_exit(ib_cm_cleanup);