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 "cm_msgs.h"
  29 #include "core_priv.h"
  30
  31 MODULE_AUTHOR("Sean Hefty");
  32 MODULE_DESCRIPTION("InfiniBand CM");
  33 MODULE_LICENSE("Dual BSD/GPL");
  34
  35 static const char * const ibcm_rej_reason_strs[] = {
  36         [IB_CM_REJ_NO_QP]                       = "no QP",
  37         [IB_CM_REJ_NO_EEC]                      = "no EEC",
  38         [IB_CM_REJ_NO_RESOURCES]                = "no resources",
  39         [IB_CM_REJ_TIMEOUT]                     = "timeout",
  40         [IB_CM_REJ_UNSUPPORTED]                 = "unsupported",
  41         [IB_CM_REJ_INVALID_COMM_ID]             = "invalid comm ID",
  42         [IB_CM_REJ_INVALID_COMM_INSTANCE]       = "invalid comm instance",
  43         [IB_CM_REJ_INVALID_SERVICE_ID]          = "invalid service ID",
  44         [IB_CM_REJ_INVALID_TRANSPORT_TYPE]      = "invalid transport type",
  45         [IB_CM_REJ_STALE_CONN]                  = "stale conn",
  46         [IB_CM_REJ_RDC_NOT_EXIST]               = "RDC not exist",
  47         [IB_CM_REJ_INVALID_GID]                 = "invalid GID",
  48         [IB_CM_REJ_INVALID_LID]                 = "invalid LID",
  49         [IB_CM_REJ_INVALID_SL]                  = "invalid SL",
  50         [IB_CM_REJ_INVALID_TRAFFIC_CLASS]       = "invalid traffic class",
  51         [IB_CM_REJ_INVALID_HOP_LIMIT]           = "invalid hop limit",
  52         [IB_CM_REJ_INVALID_PACKET_RATE]         = "invalid packet rate",
  53         [IB_CM_REJ_INVALID_ALT_GID]             = "invalid alt GID",
  54         [IB_CM_REJ_INVALID_ALT_LID]             = "invalid alt LID",
  55         [IB_CM_REJ_INVALID_ALT_SL]              = "invalid alt SL",
  56         [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS]   = "invalid alt traffic class",
  57         [IB_CM_REJ_INVALID_ALT_HOP_LIMIT]       = "invalid alt hop limit",
  58         [IB_CM_REJ_INVALID_ALT_PACKET_RATE]     = "invalid alt packet rate",
  59         [IB_CM_REJ_PORT_CM_REDIRECT]            = "port CM redirect",
  60         [IB_CM_REJ_PORT_REDIRECT]               = "port redirect",
  61         [IB_CM_REJ_INVALID_MTU]                 = "invalid MTU",
  62         [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
  63         [IB_CM_REJ_CONSUMER_DEFINED]            = "consumer defined",
  64         [IB_CM_REJ_INVALID_RNR_RETRY]           = "invalid RNR retry",
  65         [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID]     = "duplicate local comm ID",
  66         [IB_CM_REJ_INVALID_CLASS_VERSION]       = "invalid class version",
  67         [IB_CM_REJ_INVALID_FLOW_LABEL]          = "invalid flow label",
  68         [IB_CM_REJ_INVALID_ALT_FLOW_LABEL]      = "invalid alt flow label",
  69         [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
  70                 "vendor option is not supported",
  71 };
  72
  73 const char *__attribute_const__ ibcm_reject_msg(int reason)
  74 {
  75         size_t index = reason;
  76
  77         if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
  78             ibcm_rej_reason_strs[index])
  79                 return ibcm_rej_reason_strs[index];
  80         else
  81                 return "unrecognized reason";
  82 }
  83 EXPORT_SYMBOL(ibcm_reject_msg);
  84
  85 struct cm_id_private;
  86 struct cm_work;
  87 static int cm_add_one(struct ib_device *device);
  88 static void cm_remove_one(struct ib_device *device, void *client_data);
  89 static void cm_process_work(struct cm_id_private *cm_id_priv,
  90                             struct cm_work *work);
  91 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
  92                                    struct ib_cm_sidr_rep_param *param);
  93 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
  94                                const void *private_data, u8 private_data_len);
  95 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
  96                                void *private_data, u8 private_data_len);
  97 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
  98                               enum ib_cm_rej_reason reason, void *ari,
  99                               u8 ari_length, const void *private_data,
 100                               u8 private_data_len);
 101
 102 static struct ib_client cm_client = {
 103         .name   = "cm",
 104         .add    = cm_add_one,
 105         .remove = cm_remove_one
 106 };
 107
 108 static struct ib_cm {
 109         spinlock_t lock;
 110         struct list_head device_list;
 111         rwlock_t device_lock;
 112         struct rb_root listen_service_table;
 113         u64 listen_service_id;
 114         /* struct rb_root peer_service_table; todo: fix peer to peer */
 115         struct rb_root remote_qp_table;
 116         struct rb_root remote_id_table;
 117         struct rb_root remote_sidr_table;
 118         struct xarray local_id_table;
 119         u32 local_id_next;
 120         __be32 random_id_operand;
 121         struct list_head timewait_list;
 122         struct workqueue_struct *wq;
 123         /* Sync on cm change port state */
 124         spinlock_t state_lock;
 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 static char const counter_group_names[CM_COUNTER_GROUPS]
 153                                      [sizeof("cm_rx_duplicates")] = {
 154         "cm_tx_msgs", "cm_tx_retries",
 155         "cm_rx_msgs", "cm_rx_duplicates"
 156 };
 157
 158 struct cm_counter_group {
 159         struct kobject obj;
 160         atomic_long_t counter[CM_ATTR_COUNT];
 161 };
 162
 163 struct cm_counter_attribute {
 164         struct attribute attr;
 165         int index;
 166 };
 167
 168 #define CM_COUNTER_ATTR(_name, _index) \
 169 struct cm_counter_attribute cm_##_name##_counter_attr = { \
 170         .attr = { .name = __stringify(_name), .mode = 0444 }, \
 171         .index = _index \
 172 }
 173
 174 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
 175 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
 176 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
 177 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
 178 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
 179 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
 180 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
 181 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
 182 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
 183 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
 184 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
 185
 186 static struct attribute *cm_counter_default_attrs[] = {
 187         &cm_req_counter_attr.attr,
 188         &cm_mra_counter_attr.attr,
 189         &cm_rej_counter_attr.attr,
 190         &cm_rep_counter_attr.attr,
 191         &cm_rtu_counter_attr.attr,
 192         &cm_dreq_counter_attr.attr,
 193         &cm_drep_counter_attr.attr,
 194         &cm_sidr_req_counter_attr.attr,
 195         &cm_sidr_rep_counter_attr.attr,
 196         &cm_lap_counter_attr.attr,
 197         &cm_apr_counter_attr.attr,
 198         NULL
 199 };
 200
 201 struct cm_port {
 202         struct cm_device *cm_dev;
 203         struct ib_mad_agent *mad_agent;
 204         struct kobject port_obj;
 205         u8 port_num;
 206         struct list_head cm_priv_prim_list;
 207         struct list_head cm_priv_altr_list;
 208         struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
 209 };
 210
 211 struct cm_device {
 212         struct list_head list;
 213         struct ib_device *ib_device;
 214         u8 ack_delay;
 215         int going_down;
 216         struct cm_port *port[];
 217 };
 218
 219 struct cm_av {
 220         struct cm_port *port;
 221         union ib_gid dgid;
 222         struct rdma_ah_attr ah_attr;
 223         u16 pkey_index;
 224         u8 timeout;
 225 };
 226
 227 struct cm_work {
 228         struct delayed_work work;
 229         struct list_head list;
 230         struct cm_port *port;
 231         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 232         __be32 local_id;                        /* Established / timewait */
 233         __be32 remote_id;
 234         struct ib_cm_event cm_event;
 235         struct sa_path_rec path[];
 236 };
 237
 238 struct cm_timewait_info {
 239         struct cm_work work;
 240         struct list_head list;
 241         struct rb_node remote_qp_node;
 242         struct rb_node remote_id_node;
 243         __be64 remote_ca_guid;
 244         __be32 remote_qpn;
 245         u8 inserted_remote_qp;
 246         u8 inserted_remote_id;
 247 };
 248
 249 struct cm_id_private {
 250         struct ib_cm_id id;
 251
 252         struct rb_node service_node;
 253         struct rb_node sidr_id_node;
 254         spinlock_t lock;        /* Do not acquire inside cm.lock */
 255         struct completion comp;
 256         refcount_t refcount;
 257         /* Number of clients sharing this ib_cm_id. Only valid for listeners.
 258          * Protected by the cm.lock spinlock. */
 259         int listen_sharecount;
 260         struct rcu_head rcu;
 261
 262         struct ib_mad_send_buf *msg;
 263         struct cm_timewait_info *timewait_info;
 264         /* todo: use alternate port on send failure */
 265         struct cm_av av;
 266         struct cm_av alt_av;
 267
 268         void *private_data;
 269         __be64 tid;
 270         __be32 local_qpn;
 271         __be32 remote_qpn;
 272         enum ib_qp_type qp_type;
 273         __be32 sq_psn;
 274         __be32 rq_psn;
 275         int timeout_ms;
 276         enum ib_mtu path_mtu;
 277         __be16 pkey;
 278         u8 private_data_len;
 279         u8 max_cm_retries;
 280         u8 responder_resources;
 281         u8 initiator_depth;
 282         u8 retry_count;
 283         u8 rnr_retry_count;
 284         u8 service_timeout;
 285         u8 target_ack_delay;
 286
 287         struct list_head prim_list;
 288         struct list_head altr_list;
 289         /* Indicates that the send port mad is registered and av is set */
 290         int prim_send_port_not_ready;
 291         int altr_send_port_not_ready;
 292
 293         struct list_head work_list;
 294         atomic_t work_count;
 295
 296         struct rdma_ucm_ece ece;
 297 };
 298
 299 static void cm_work_handler(struct work_struct *work);
 300
 301 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 302 {
 303         if (refcount_dec_and_test(&cm_id_priv->refcount))
 304                 complete(&cm_id_priv->comp);
 305 }
 306
 307 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 308                         struct ib_mad_send_buf **msg)
 309 {
 310         struct ib_mad_agent *mad_agent;
 311         struct ib_mad_send_buf *m;
 312         struct ib_ah *ah;
 313         struct cm_av *av;
 314         unsigned long flags, flags2;
 315         int ret = 0;
 316
 317         /* don't let the port to be released till the agent is down */
 318         spin_lock_irqsave(&cm.state_lock, flags2);
 319         spin_lock_irqsave(&cm.lock, flags);
 320         if (!cm_id_priv->prim_send_port_not_ready)
 321                 av = &cm_id_priv->av;
 322         else if (!cm_id_priv->altr_send_port_not_ready &&
 323                  (cm_id_priv->alt_av.port))
 324                 av = &cm_id_priv->alt_av;
 325         else {
 326                 pr_info("%s: not valid CM id\n", __func__);
 327                 ret = -ENODEV;
 328                 spin_unlock_irqrestore(&cm.lock, flags);
 329                 goto out;
 330         }
 331         spin_unlock_irqrestore(&cm.lock, flags);
 332         /* Make sure the port haven't released the mad yet */
 333         mad_agent = cm_id_priv->av.port->mad_agent;
 334         if (!mad_agent) {
 335                 pr_info("%s: not a valid MAD agent\n", __func__);
 336                 ret = -ENODEV;
 337                 goto out;
 338         }
 339         ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0);
 340         if (IS_ERR(ah)) {
 341                 ret = PTR_ERR(ah);
 342                 goto out;
 343         }
 344
 345         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 346                                av->pkey_index,
 347                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 348                                GFP_ATOMIC,
 349                                IB_MGMT_BASE_VERSION);
 350         if (IS_ERR(m)) {
 351                 rdma_destroy_ah(ah, 0);
 352                 ret = PTR_ERR(m);
 353                 goto out;
 354         }
 355
 356         /* Timeout set by caller if response is expected. */
 357         m->ah = ah;
 358         m->retries = cm_id_priv->max_cm_retries;
 359
 360         refcount_inc(&cm_id_priv->refcount);
 361         m->context[0] = cm_id_priv;
 362         *msg = m;
 363
 364 out:
 365         spin_unlock_irqrestore(&cm.state_lock, flags2);
 366         return ret;
 367 }
 368
 369 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
 370                                                            struct ib_mad_recv_wc *mad_recv_wc)
 371 {
 372         return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 373                                   0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 374                                   GFP_ATOMIC,
 375                                   IB_MGMT_BASE_VERSION);
 376 }
 377
 378 static int cm_create_response_msg_ah(struct cm_port *port,
 379                                      struct ib_mad_recv_wc *mad_recv_wc,
 380                                      struct ib_mad_send_buf *msg)
 381 {
 382         struct ib_ah *ah;
 383
 384         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 385                                   mad_recv_wc->recv_buf.grh, port->port_num);
 386         if (IS_ERR(ah))
 387                 return PTR_ERR(ah);
 388
 389         msg->ah = ah;
 390         return 0;
 391 }
 392
 393 static void cm_free_msg(struct ib_mad_send_buf *msg)
 394 {
 395         if (msg->ah)
 396                 rdma_destroy_ah(msg->ah, 0);
 397         if (msg->context[0])
 398                 cm_deref_id(msg->context[0]);
 399         ib_free_send_mad(msg);
 400 }
 401
 402 static int cm_alloc_response_msg(struct cm_port *port,
 403                                  struct ib_mad_recv_wc *mad_recv_wc,
 404                                  struct ib_mad_send_buf **msg)
 405 {
 406         struct ib_mad_send_buf *m;
 407         int ret;
 408
 409         m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
 410         if (IS_ERR(m))
 411                 return PTR_ERR(m);
 412
 413         ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
 414         if (ret) {
 415                 cm_free_msg(m);
 416                 return ret;
 417         }
 418
 419         *msg = m;
 420         return 0;
 421 }
 422
 423 static void * cm_copy_private_data(const void *private_data,
 424                                    u8 private_data_len)
 425 {
 426         void *data;
 427
 428         if (!private_data || !private_data_len)
 429                 return NULL;
 430
 431         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 432         if (!data)
 433                 return ERR_PTR(-ENOMEM);
 434
 435         return data;
 436 }
 437
 438 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 439                                  void *private_data, u8 private_data_len)
 440 {
 441         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 442                 kfree(cm_id_priv->private_data);
 443
 444         cm_id_priv->private_data = private_data;
 445         cm_id_priv->private_data_len = private_data_len;
 446 }
 447
 448 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
 449                               struct ib_grh *grh, struct cm_av *av)
 450 {
 451         struct rdma_ah_attr new_ah_attr;
 452         int ret;
 453
 454         av->port = port;
 455         av->pkey_index = wc->pkey_index;
 456
 457         /*
 458          * av->ah_attr might be initialized based on past wc during incoming
 459          * connect request or while sending out connect request. So initialize
 460          * a new ah_attr on stack. If initialization fails, old ah_attr is
 461          * used for sending any responses. If initialization is successful,
 462          * than new ah_attr is used by overwriting old one.
 463          */
 464         ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
 465                                       port->port_num, wc,
 466                                       grh, &new_ah_attr);
 467         if (ret)
 468                 return ret;
 469
 470         rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
 471         return 0;
 472 }
 473
 474 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 475                                    struct ib_grh *grh, struct cm_av *av)
 476 {
 477         av->port = port;
 478         av->pkey_index = wc->pkey_index;
 479         return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
 480                                        port->port_num, wc,
 481                                        grh, &av->ah_attr);
 482 }
 483
 484 static void add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
 485                                    struct cm_av *av, struct cm_port *port)
 486 {
 487         unsigned long flags;
 488
 489         spin_lock_irqsave(&cm.lock, flags);
 490         if (&cm_id_priv->av == av)
 491                 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
 492         else if (&cm_id_priv->alt_av == av)
 493                 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
 494         else
 495                 WARN_ON(true);
 496         spin_unlock_irqrestore(&cm.lock, flags);
 497 }
 498
 499 static struct cm_port *
 500 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
 501 {
 502         struct cm_device *cm_dev;
 503         struct cm_port *port = NULL;
 504         unsigned long flags;
 505
 506         if (attr) {
 507                 read_lock_irqsave(&cm.device_lock, flags);
 508                 list_for_each_entry(cm_dev, &cm.device_list, list) {
 509                         if (cm_dev->ib_device == attr->device) {
 510                                 port = cm_dev->port[attr->port_num - 1];
 511                                 break;
 512                         }
 513                 }
 514                 read_unlock_irqrestore(&cm.device_lock, flags);
 515         } else {
 516                 /* SGID attribute can be NULL in following
 517                  * conditions.
 518                  * (a) Alternative path
 519                  * (b) IB link layer without GRH
 520                  * (c) LAP send messages
 521                  */
 522                 read_lock_irqsave(&cm.device_lock, flags);
 523                 list_for_each_entry(cm_dev, &cm.device_list, list) {
 524                         attr = rdma_find_gid(cm_dev->ib_device,
 525                                              &path->sgid,
 526                                              sa_conv_pathrec_to_gid_type(path),
 527                                              NULL);
 528                         if (!IS_ERR(attr)) {
 529                                 port = cm_dev->port[attr->port_num - 1];
 530                                 break;
 531                         }
 532                 }
 533                 read_unlock_irqrestore(&cm.device_lock, flags);
 534                 if (port)
 535                         rdma_put_gid_attr(attr);
 536         }
 537         return port;
 538 }
 539
 540 static int cm_init_av_by_path(struct sa_path_rec *path,
 541                               const struct ib_gid_attr *sgid_attr,
 542                               struct cm_av *av,
 543                               struct cm_id_private *cm_id_priv)
 544 {
 545         struct rdma_ah_attr new_ah_attr;
 546         struct cm_device *cm_dev;
 547         struct cm_port *port;
 548         int ret;
 549
 550         port = get_cm_port_from_path(path, sgid_attr);
 551         if (!port)
 552                 return -EINVAL;
 553         cm_dev = port->cm_dev;
 554
 555         ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
 556                                   be16_to_cpu(path->pkey), &av->pkey_index);
 557         if (ret)
 558                 return ret;
 559
 560         av->port = port;
 561
 562         /*
 563          * av->ah_attr might be initialized based on wc or during
 564          * request processing time which might have reference to sgid_attr.
 565          * So initialize a new ah_attr on stack.
 566          * If initialization fails, old ah_attr is used for sending any
 567          * responses. If initialization is successful, than new ah_attr
 568          * is used by overwriting the old one. So that right ah_attr
 569          * can be used to return an error response.
 570          */
 571         ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
 572                                         &new_ah_attr, sgid_attr);
 573         if (ret)
 574                 return ret;
 575
 576         av->timeout = path->packet_life_time + 1;
 577         add_cm_id_to_port_list(cm_id_priv, av, port);
 578         rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
 579         return 0;
 580 }
 581
 582 static u32 cm_local_id(__be32 local_id)
 583 {
 584         return (__force u32) (local_id ^ cm.random_id_operand);
 585 }
 586
 587 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
 588 {
 589         struct cm_id_private *cm_id_priv;
 590
 591         rcu_read_lock();
 592         cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
 593         if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
 594             !refcount_inc_not_zero(&cm_id_priv->refcount))
 595                 cm_id_priv = NULL;
 596         rcu_read_unlock();
 597
 598         return cm_id_priv;
 599 }
 600
 601 /*
 602  * Trivial helpers to strip endian annotation and compare; the
 603  * endianness doesn't actually matter since we just need a stable
 604  * order for the RB tree.
 605  */
 606 static int be32_lt(__be32 a, __be32 b)
 607 {
 608         return (__force u32) a < (__force u32) b;
 609 }
 610
 611 static int be32_gt(__be32 a, __be32 b)
 612 {
 613         return (__force u32) a > (__force u32) b;
 614 }
 615
 616 static int be64_lt(__be64 a, __be64 b)
 617 {
 618         return (__force u64) a < (__force u64) b;
 619 }
 620
 621 static int be64_gt(__be64 a, __be64 b)
 622 {
 623         return (__force u64) a > (__force u64) b;
 624 }
 625
 626 /*
 627  * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
 628  * if the new ID was inserted, NULL if it could not be inserted due to a
 629  * collision, or the existing cm_id_priv ready for shared usage.
 630  */
 631 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
 632                                               ib_cm_handler shared_handler)
 633 {
 634         struct rb_node **link = &cm.listen_service_table.rb_node;
 635         struct rb_node *parent = NULL;
 636         struct cm_id_private *cur_cm_id_priv;
 637         __be64 service_id = cm_id_priv->id.service_id;
 638         __be64 service_mask = cm_id_priv->id.service_mask;
 639         unsigned long flags;
 640
 641         spin_lock_irqsave(&cm.lock, flags);
 642         while (*link) {
 643                 parent = *link;
 644                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 645                                           service_node);
 646                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 647                     (service_mask & cur_cm_id_priv->id.service_id) &&
 648                     (cm_id_priv->id.device == cur_cm_id_priv->id.device)) {
 649                         /*
 650                          * Sharing an ib_cm_id with different handlers is not
 651                          * supported
 652                          */
 653                         if (cur_cm_id_priv->id.cm_handler != shared_handler ||
 654                             cur_cm_id_priv->id.context ||
 655                             WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
 656                                 spin_unlock_irqrestore(&cm.lock, flags);
 657                                 return NULL;
 658                         }
 659                         refcount_inc(&cur_cm_id_priv->refcount);
 660                         cur_cm_id_priv->listen_sharecount++;
 661                         spin_unlock_irqrestore(&cm.lock, flags);
 662                         return cur_cm_id_priv;
 663                 }
 664
 665                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 666                         link = &(*link)->rb_left;
 667                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 668                         link = &(*link)->rb_right;
 669                 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
 670                         link = &(*link)->rb_left;
 671                 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
 672                         link = &(*link)->rb_right;
 673                 else
 674                         link = &(*link)->rb_right;
 675         }
 676         cm_id_priv->listen_sharecount++;
 677         rb_link_node(&cm_id_priv->service_node, parent, link);
 678         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 679         spin_unlock_irqrestore(&cm.lock, flags);
 680         return cm_id_priv;
 681 }
 682
 683 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 684                                              __be64 service_id)
 685 {
 686         struct rb_node *node = cm.listen_service_table.rb_node;
 687         struct cm_id_private *cm_id_priv;
 688
 689         while (node) {
 690                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 691                 if ((cm_id_priv->id.service_mask & service_id) ==
 692                      cm_id_priv->id.service_id &&
 693                     (cm_id_priv->id.device == device)) {
 694                         refcount_inc(&cm_id_priv->refcount);
 695                         return cm_id_priv;
 696                 }
 697                 if (device < cm_id_priv->id.device)
 698                         node = node->rb_left;
 699                 else if (device > cm_id_priv->id.device)
 700                         node = node->rb_right;
 701                 else if (be64_lt(service_id, cm_id_priv->id.service_id))
 702                         node = node->rb_left;
 703                 else if (be64_gt(service_id, cm_id_priv->id.service_id))
 704                         node = node->rb_right;
 705                 else
 706                         node = node->rb_right;
 707         }
 708         return NULL;
 709 }
 710
 711 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 712                                                      *timewait_info)
 713 {
 714         struct rb_node **link = &cm.remote_id_table.rb_node;
 715         struct rb_node *parent = NULL;
 716         struct cm_timewait_info *cur_timewait_info;
 717         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 718         __be32 remote_id = timewait_info->work.remote_id;
 719
 720         while (*link) {
 721                 parent = *link;
 722                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 723                                              remote_id_node);
 724                 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
 725                         link = &(*link)->rb_left;
 726                 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
 727                         link = &(*link)->rb_right;
 728                 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 729                         link = &(*link)->rb_left;
 730                 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 731                         link = &(*link)->rb_right;
 732                 else
 733                         return cur_timewait_info;
 734         }
 735         timewait_info->inserted_remote_id = 1;
 736         rb_link_node(&timewait_info->remote_id_node, parent, link);
 737         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 738         return NULL;
 739 }
 740
 741 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
 742                                                __be32 remote_id)
 743 {
 744         struct rb_node *node = cm.remote_id_table.rb_node;
 745         struct cm_timewait_info *timewait_info;
 746         struct cm_id_private *res = NULL;
 747
 748         spin_lock_irq(&cm.lock);
 749         while (node) {
 750                 timewait_info = rb_entry(node, struct cm_timewait_info,
 751                                          remote_id_node);
 752                 if (be32_lt(remote_id, timewait_info->work.remote_id))
 753                         node = node->rb_left;
 754                 else if (be32_gt(remote_id, timewait_info->work.remote_id))
 755                         node = node->rb_right;
 756                 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
 757                         node = node->rb_left;
 758                 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
 759                         node = node->rb_right;
 760                 else {
 761                         res = cm_acquire_id(timewait_info->work.local_id,
 762                                              timewait_info->work.remote_id);
 763                         break;
 764                 }
 765         }
 766         spin_unlock_irq(&cm.lock);
 767         return res;
 768 }
 769
 770 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 771                                                       *timewait_info)
 772 {
 773         struct rb_node **link = &cm.remote_qp_table.rb_node;
 774         struct rb_node *parent = NULL;
 775         struct cm_timewait_info *cur_timewait_info;
 776         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 777         __be32 remote_qpn = timewait_info->remote_qpn;
 778
 779         while (*link) {
 780                 parent = *link;
 781                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 782                                              remote_qp_node);
 783                 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
 784                         link = &(*link)->rb_left;
 785                 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
 786                         link = &(*link)->rb_right;
 787                 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 788                         link = &(*link)->rb_left;
 789                 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 790                         link = &(*link)->rb_right;
 791                 else
 792                         return cur_timewait_info;
 793         }
 794         timewait_info->inserted_remote_qp = 1;
 795         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 796         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 797         return NULL;
 798 }
 799
 800 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 801                                                     *cm_id_priv)
 802 {
 803         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 804         struct rb_node *parent = NULL;
 805         struct cm_id_private *cur_cm_id_priv;
 806         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 807         __be32 remote_id = cm_id_priv->id.remote_id;
 808
 809         while (*link) {
 810                 parent = *link;
 811                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 812                                           sidr_id_node);
 813                 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
 814                         link = &(*link)->rb_left;
 815                 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
 816                         link = &(*link)->rb_right;
 817                 else {
 818                         int cmp;
 819                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 820                                      sizeof *port_gid);
 821                         if (cmp < 0)
 822                                 link = &(*link)->rb_left;
 823                         else if (cmp > 0)
 824                                 link = &(*link)->rb_right;
 825                         else
 826                                 return cur_cm_id_priv;
 827                 }
 828         }
 829         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 830         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 831         return NULL;
 832 }
 833
 834 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
 835                                               ib_cm_handler cm_handler,
 836                                               void *context)
 837 {
 838         struct cm_id_private *cm_id_priv;
 839         u32 id;
 840         int ret;
 841
 842         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 843         if (!cm_id_priv)
 844                 return ERR_PTR(-ENOMEM);
 845
 846         cm_id_priv->id.state = IB_CM_IDLE;
 847         cm_id_priv->id.device = device;
 848         cm_id_priv->id.cm_handler = cm_handler;
 849         cm_id_priv->id.context = context;
 850         cm_id_priv->id.remote_cm_qpn = 1;
 851
 852         RB_CLEAR_NODE(&cm_id_priv->service_node);
 853         RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
 854         spin_lock_init(&cm_id_priv->lock);
 855         init_completion(&cm_id_priv->comp);
 856         INIT_LIST_HEAD(&cm_id_priv->work_list);
 857         INIT_LIST_HEAD(&cm_id_priv->prim_list);
 858         INIT_LIST_HEAD(&cm_id_priv->altr_list);
 859         atomic_set(&cm_id_priv->work_count, -1);
 860         refcount_set(&cm_id_priv->refcount, 1);
 861
 862         ret = xa_alloc_cyclic_irq(&cm.local_id_table, &id, NULL, xa_limit_32b,
 863                                   &cm.local_id_next, GFP_KERNEL);
 864         if (ret < 0)
 865                 goto error;
 866         cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
 867
 868         return cm_id_priv;
 869
 870 error:
 871         kfree(cm_id_priv);
 872         return ERR_PTR(ret);
 873 }
 874
 875 /*
 876  * Make the ID visible to the MAD handlers and other threads that use the
 877  * xarray.
 878  */
 879 static void cm_finalize_id(struct cm_id_private *cm_id_priv)
 880 {
 881         xa_store_irq(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
 882                      cm_id_priv, GFP_KERNEL);
 883 }
 884
 885 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 886                                  ib_cm_handler cm_handler,
 887                                  void *context)
 888 {
 889         struct cm_id_private *cm_id_priv;
 890
 891         cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
 892         if (IS_ERR(cm_id_priv))
 893                 return ERR_CAST(cm_id_priv);
 894
 895         cm_finalize_id(cm_id_priv);
 896         return &cm_id_priv->id;
 897 }
 898 EXPORT_SYMBOL(ib_create_cm_id);
 899
 900 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 901 {
 902         struct cm_work *work;
 903
 904         if (list_empty(&cm_id_priv->work_list))
 905                 return NULL;
 906
 907         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 908         list_del(&work->list);
 909         return work;
 910 }
 911
 912 static void cm_free_work(struct cm_work *work)
 913 {
 914         if (work->mad_recv_wc)
 915                 ib_free_recv_mad(work->mad_recv_wc);
 916         kfree(work);
 917 }
 918
 919 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
 920                                  struct cm_work *work)
 921         __releases(&cm_id_priv->lock)
 922 {
 923         bool immediate;
 924
 925         /*
 926          * To deliver the event to the user callback we have the drop the
 927          * spinlock, however, we need to ensure that the user callback is single
 928          * threaded and receives events in the temporal order. If there are
 929          * already events being processed then thread new events onto a list,
 930          * the thread currently processing will pick them up.
 931          */
 932         immediate = atomic_inc_and_test(&cm_id_priv->work_count);
 933         if (!immediate) {
 934                 list_add_tail(&work->list, &cm_id_priv->work_list);
 935                 /*
 936                  * This routine always consumes incoming reference. Once queued
 937                  * to the work_list then a reference is held by the thread
 938                  * currently running cm_process_work() and this reference is not
 939                  * needed.
 940                  */
 941                 cm_deref_id(cm_id_priv);
 942         }
 943         spin_unlock_irq(&cm_id_priv->lock);
 944
 945         if (immediate)
 946                 cm_process_work(cm_id_priv, work);
 947 }
 948
 949 static inline int cm_convert_to_ms(int iba_time)
 950 {
 951         /* approximate conversion to ms from 4.096us x 2^iba_time */
 952         return 1 << max(iba_time - 8, 0);
 953 }
 954
 955 /*
 956  * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
 957  * Because of how ack_timeout is stored, adding one doubles the timeout.
 958  * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
 959  * increment it (round up) only if the other is within 50%.
 960  */
 961 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
 962 {
 963         int ack_timeout = packet_life_time + 1;
 964
 965         if (ack_timeout >= ca_ack_delay)
 966                 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
 967         else
 968                 ack_timeout = ca_ack_delay +
 969                               (ack_timeout >= (ca_ack_delay - 1));
 970
 971         return min(31, ack_timeout);
 972 }
 973
 974 static void cm_remove_remote(struct cm_id_private *cm_id_priv)
 975 {
 976         struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
 977
 978         if (timewait_info->inserted_remote_id) {
 979                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 980                 timewait_info->inserted_remote_id = 0;
 981         }
 982
 983         if (timewait_info->inserted_remote_qp) {
 984                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 985                 timewait_info->inserted_remote_qp = 0;
 986         }
 987 }
 988
 989 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 990 {
 991         struct cm_timewait_info *timewait_info;
 992
 993         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 994         if (!timewait_info)
 995                 return ERR_PTR(-ENOMEM);
 996
 997         timewait_info->work.local_id = local_id;
 998         INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
 999         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
1000         return timewait_info;
1001 }
1002
1003 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
1004 {
1005         int wait_time;
1006         unsigned long flags;
1007         struct cm_device *cm_dev;
1008
1009         lockdep_assert_held(&cm_id_priv->lock);
1010
1011         cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
1012         if (!cm_dev)
1013                 return;
1014
1015         spin_lock_irqsave(&cm.lock, flags);
1016         cm_remove_remote(cm_id_priv);
1017         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
1018         spin_unlock_irqrestore(&cm.lock, flags);
1019
1020         /*
1021          * The cm_id could be destroyed by the user before we exit timewait.
1022          * To protect against this, we search for the cm_id after exiting
1023          * timewait before notifying the user that we've exited timewait.
1024          */
1025         cm_id_priv->id.state = IB_CM_TIMEWAIT;
1026         wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
1027
1028         /* Check if the device started its remove_one */
1029         spin_lock_irqsave(&cm.lock, flags);
1030         if (!cm_dev->going_down)
1031                 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
1032                                    msecs_to_jiffies(wait_time));
1033         spin_unlock_irqrestore(&cm.lock, flags);
1034
1035         /*
1036          * The timewait_info is converted into a work and gets freed during
1037          * cm_free_work() in cm_timewait_handler().
1038          */
1039         BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1040         cm_id_priv->timewait_info = NULL;
1041 }
1042
1043 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1044 {
1045         unsigned long flags;
1046
1047         lockdep_assert_held(&cm_id_priv->lock);
1048
1049         cm_id_priv->id.state = IB_CM_IDLE;
1050         if (cm_id_priv->timewait_info) {
1051                 spin_lock_irqsave(&cm.lock, flags);
1052                 cm_remove_remote(cm_id_priv);
1053                 spin_unlock_irqrestore(&cm.lock, flags);
1054                 kfree(cm_id_priv->timewait_info);
1055                 cm_id_priv->timewait_info = NULL;
1056         }
1057 }
1058
1059 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1060 {
1061         struct cm_id_private *cm_id_priv;
1062         struct cm_work *work;
1063
1064         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1065         spin_lock_irq(&cm_id_priv->lock);
1066 retest:
1067         switch (cm_id->state) {
1068         case IB_CM_LISTEN:
1069                 spin_lock(&cm.lock);
1070                 if (--cm_id_priv->listen_sharecount > 0) {
1071                         /* The id is still shared. */
1072                         WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1073                         spin_unlock(&cm.lock);
1074                         spin_unlock_irq(&cm_id_priv->lock);
1075                         cm_deref_id(cm_id_priv);
1076                         return;
1077                 }
1078                 cm_id->state = IB_CM_IDLE;
1079                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1080                 RB_CLEAR_NODE(&cm_id_priv->service_node);
1081                 spin_unlock(&cm.lock);
1082                 break;
1083         case IB_CM_SIDR_REQ_SENT:
1084                 cm_id->state = IB_CM_IDLE;
1085                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1086                 break;
1087         case IB_CM_SIDR_REQ_RCVD:
1088                 cm_send_sidr_rep_locked(cm_id_priv,
1089                                         &(struct ib_cm_sidr_rep_param){
1090                                                 .status = IB_SIDR_REJECT });
1091                 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1092                 cm_id->state = IB_CM_IDLE;
1093                 break;
1094         case IB_CM_REQ_SENT:
1095         case IB_CM_MRA_REQ_RCVD:
1096                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1097                 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT,
1098                                    &cm_id_priv->id.device->node_guid,
1099                                    sizeof(cm_id_priv->id.device->node_guid),
1100                                    NULL, 0);
1101                 break;
1102         case IB_CM_REQ_RCVD:
1103                 if (err == -ENOMEM) {
1104                         /* Do not reject to allow future retries. */
1105                         cm_reset_to_idle(cm_id_priv);
1106                 } else {
1107                         cm_send_rej_locked(cm_id_priv,
1108                                            IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
1109                                            NULL, 0);
1110                 }
1111                 break;
1112         case IB_CM_REP_SENT:
1113         case IB_CM_MRA_REP_RCVD:
1114                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1115                 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1116                                    0, NULL, 0);
1117                 goto retest;
1118         case IB_CM_MRA_REQ_SENT:
1119         case IB_CM_REP_RCVD:
1120         case IB_CM_MRA_REP_SENT:
1121                 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1122                                    0, NULL, 0);
1123                 break;
1124         case IB_CM_ESTABLISHED:
1125                 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1126                         cm_id->state = IB_CM_IDLE;
1127                         break;
1128                 }
1129                 cm_send_dreq_locked(cm_id_priv, NULL, 0);
1130                 goto retest;
1131         case IB_CM_DREQ_SENT:
1132                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1133                 cm_enter_timewait(cm_id_priv);
1134                 goto retest;
1135         case IB_CM_DREQ_RCVD:
1136                 cm_send_drep_locked(cm_id_priv, NULL, 0);
1137                 WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1138                 goto retest;
1139         case IB_CM_TIMEWAIT:
1140                 /*
1141                  * The cm_acquire_id in cm_timewait_handler will stop working
1142                  * once we do xa_erase below, so just move to idle here for
1143                  * consistency.
1144                  */
1145                 cm_id->state = IB_CM_IDLE;
1146                 break;
1147         case IB_CM_IDLE:
1148                 break;
1149         }
1150         WARN_ON(cm_id->state != IB_CM_IDLE);
1151
1152         spin_lock(&cm.lock);
1153         /* Required for cleanup paths related cm_req_handler() */
1154         if (cm_id_priv->timewait_info) {
1155                 cm_remove_remote(cm_id_priv);
1156                 kfree(cm_id_priv->timewait_info);
1157                 cm_id_priv->timewait_info = NULL;
1158         }
1159         if (!list_empty(&cm_id_priv->altr_list) &&
1160             (!cm_id_priv->altr_send_port_not_ready))
1161                 list_del(&cm_id_priv->altr_list);
1162         if (!list_empty(&cm_id_priv->prim_list) &&
1163             (!cm_id_priv->prim_send_port_not_ready))
1164                 list_del(&cm_id_priv->prim_list);
1165         WARN_ON(cm_id_priv->listen_sharecount);
1166         WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1167         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1168                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1169         spin_unlock(&cm.lock);
1170         spin_unlock_irq(&cm_id_priv->lock);
1171
1172         xa_erase_irq(&cm.local_id_table, cm_local_id(cm_id->local_id));
1173         cm_deref_id(cm_id_priv);
1174         wait_for_completion(&cm_id_priv->comp);
1175         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1176                 cm_free_work(work);
1177
1178         rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
1179         rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
1180         kfree(cm_id_priv->private_data);
1181         kfree_rcu(cm_id_priv, rcu);
1182 }
1183
1184 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1185 {
1186         cm_destroy_id(cm_id, 0);
1187 }
1188 EXPORT_SYMBOL(ib_destroy_cm_id);
1189
1190 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id,
1191                           __be64 service_mask)
1192 {
1193         service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1194         service_id &= service_mask;
1195         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1196             (service_id != IB_CM_ASSIGN_SERVICE_ID))
1197                 return -EINVAL;
1198
1199         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1200                 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1201                 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1202         } else {
1203                 cm_id_priv->id.service_id = service_id;
1204                 cm_id_priv->id.service_mask = service_mask;
1205         }
1206         return 0;
1207 }
1208
1209 /**
1210  * ib_cm_listen - Initiates listening on the specified service ID for
1211  *   connection and service ID resolution requests.
1212  * @cm_id: Connection identifier associated with the listen request.
1213  * @service_id: Service identifier matched against incoming connection
1214  *   and service ID resolution requests.  The service ID should be specified
1215  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1216  *   assign a service ID to the caller.
1217  * @service_mask: Mask applied to service ID used to listen across a
1218  *   range of service IDs.  If set to 0, the service ID is matched
1219  *   exactly.  This parameter is ignored if %service_id is set to
1220  *   IB_CM_ASSIGN_SERVICE_ID.
1221  */
1222 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1223 {
1224         struct cm_id_private *cm_id_priv =
1225                 container_of(cm_id, struct cm_id_private, id);
1226         unsigned long flags;
1227         int ret;
1228
1229         spin_lock_irqsave(&cm_id_priv->lock, flags);
1230         if (cm_id_priv->id.state != IB_CM_IDLE) {
1231                 ret = -EINVAL;
1232                 goto out;
1233         }
1234
1235         ret = cm_init_listen(cm_id_priv, service_id, service_mask);
1236         if (ret)
1237                 goto out;
1238
1239         if (!cm_insert_listen(cm_id_priv, NULL)) {
1240                 ret = -EBUSY;
1241                 goto out;
1242         }
1243
1244         cm_id_priv->id.state = IB_CM_LISTEN;
1245         ret = 0;
1246
1247 out:
1248         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1249         return ret;
1250 }
1251 EXPORT_SYMBOL(ib_cm_listen);
1252
1253 /**
1254  * Create a new listening ib_cm_id and listen on the given service ID.
1255  *
1256  * If there's an existing ID listening on that same device and service ID,
1257  * return it.
1258  *
1259  * @device: Device associated with the cm_id.  All related communication will
1260  * be associated with the specified device.
1261  * @cm_handler: Callback invoked to notify the user of CM events.
1262  * @service_id: Service identifier matched against incoming connection
1263  *   and service ID resolution requests.  The service ID should be specified
1264  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1265  *   assign a service ID to the caller.
1266  *
1267  * Callers should call ib_destroy_cm_id when done with the listener ID.
1268  */
1269 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1270                                      ib_cm_handler cm_handler,
1271                                      __be64 service_id)
1272 {
1273         struct cm_id_private *listen_id_priv;
1274         struct cm_id_private *cm_id_priv;
1275         int err = 0;
1276
1277         /* Create an ID in advance, since the creation may sleep */
1278         cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1279         if (IS_ERR(cm_id_priv))
1280                 return ERR_CAST(cm_id_priv);
1281
1282         err = cm_init_listen(cm_id_priv, service_id, 0);
1283         if (err)
1284                 return ERR_PTR(err);
1285
1286         spin_lock_irq(&cm_id_priv->lock);
1287         listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1288         if (listen_id_priv != cm_id_priv) {
1289                 spin_unlock_irq(&cm_id_priv->lock);
1290                 ib_destroy_cm_id(&cm_id_priv->id);
1291                 if (!listen_id_priv)
1292                         return ERR_PTR(-EINVAL);
1293                 return &listen_id_priv->id;
1294         }
1295         cm_id_priv->id.state = IB_CM_LISTEN;
1296         spin_unlock_irq(&cm_id_priv->lock);
1297
1298         /*
1299          * A listen ID does not need to be in the xarray since it does not
1300          * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1301          * and does not enter timewait.
1302          */
1303
1304         return &cm_id_priv->id;
1305 }
1306 EXPORT_SYMBOL(ib_cm_insert_listen);
1307
1308 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1309 {
1310         u64 hi_tid, low_tid;
1311
1312         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1313         low_tid  = (u64)cm_id_priv->id.local_id;
1314         return cpu_to_be64(hi_tid | low_tid);
1315 }
1316
1317 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1318                               __be16 attr_id, __be64 tid)
1319 {
1320         hdr->base_version  = IB_MGMT_BASE_VERSION;
1321         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
1322         hdr->class_version = IB_CM_CLASS_VERSION;
1323         hdr->method        = IB_MGMT_METHOD_SEND;
1324         hdr->attr_id       = attr_id;
1325         hdr->tid           = tid;
1326 }
1327
1328 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1329                                   __be64 tid, u32 attr_mod)
1330 {
1331         cm_format_mad_hdr(hdr, attr_id, tid);
1332         hdr->attr_mod = cpu_to_be32(attr_mod);
1333 }
1334
1335 static void cm_format_req(struct cm_req_msg *req_msg,
1336                           struct cm_id_private *cm_id_priv,
1337                           struct ib_cm_req_param *param)
1338 {
1339         struct sa_path_rec *pri_path = param->primary_path;
1340         struct sa_path_rec *alt_path = param->alternate_path;
1341         bool pri_ext = false;
1342
1343         if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1344                 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1345                                               pri_path->opa.slid);
1346
1347         cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1348                               cm_form_tid(cm_id_priv), param->ece.attr_mod);
1349
1350         IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1351                 be32_to_cpu(cm_id_priv->id.local_id));
1352         IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1353         IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1354                 be64_to_cpu(cm_id_priv->id.device->node_guid));
1355         IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1356         IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1357         IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1358                 param->remote_cm_response_timeout);
1359         cm_req_set_qp_type(req_msg, param->qp_type);
1360         IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1361         IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1362         IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1363                 param->local_cm_response_timeout);
1364         IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1365                 be16_to_cpu(param->primary_path->pkey));
1366         IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1367                 param->primary_path->mtu);
1368         IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1369
1370         if (param->qp_type != IB_QPT_XRC_INI) {
1371                 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1372                         param->responder_resources);
1373                 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1374                 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1375                         param->rnr_retry_count);
1376                 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1377         }
1378
1379         *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1380                 pri_path->sgid;
1381         *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1382                 pri_path->dgid;
1383         if (pri_ext) {
1384                 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1385                         ->global.interface_id =
1386                         OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1387                 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1388                         ->global.interface_id =
1389                         OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1390         }
1391         if (pri_path->hop_limit <= 1) {
1392                 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1393                         be16_to_cpu(pri_ext ? 0 :
1394                                               htons(ntohl(sa_path_get_slid(
1395                                                       pri_path)))));
1396                 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1397                         be16_to_cpu(pri_ext ? 0 :
1398                                               htons(ntohl(sa_path_get_dlid(
1399                                                       pri_path)))));
1400         } else {
1401                 /* Work-around until there's a way to obtain remote LID info */
1402                 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1403                         be16_to_cpu(IB_LID_PERMISSIVE));
1404                 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1405                         be16_to_cpu(IB_LID_PERMISSIVE));
1406         }
1407         IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1408                 be32_to_cpu(pri_path->flow_label));
1409         IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1410         IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1411         IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1412         IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1413         IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1414                 (pri_path->hop_limit <= 1));
1415         IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1416                 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1417                                pri_path->packet_life_time));
1418
1419         if (alt_path) {
1420                 bool alt_ext = false;
1421
1422                 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1423                         alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1424                                                       alt_path->opa.slid);
1425
1426                 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1427                         alt_path->sgid;
1428                 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1429                         alt_path->dgid;
1430                 if (alt_ext) {
1431                         IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1432                                         req_msg)
1433                                 ->global.interface_id =
1434                                 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1435                         IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1436                                         req_msg)
1437                                 ->global.interface_id =
1438                                 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1439                 }
1440                 if (alt_path->hop_limit <= 1) {
1441                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1442                                 be16_to_cpu(
1443                                         alt_ext ? 0 :
1444                                                   htons(ntohl(sa_path_get_slid(
1445                                                           alt_path)))));
1446                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1447                                 be16_to_cpu(
1448                                         alt_ext ? 0 :
1449                                                   htons(ntohl(sa_path_get_dlid(
1450                                                           alt_path)))));
1451                 } else {
1452                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1453                                 be16_to_cpu(IB_LID_PERMISSIVE));
1454                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1455                                 be16_to_cpu(IB_LID_PERMISSIVE));
1456                 }
1457                 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1458                         be32_to_cpu(alt_path->flow_label));
1459                 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1460                 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1461                         alt_path->traffic_class);
1462                 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1463                         alt_path->hop_limit);
1464                 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1465                 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1466                         (alt_path->hop_limit <= 1));
1467                 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1468                         cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1469                                        alt_path->packet_life_time));
1470         }
1471         IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1472
1473         if (param->private_data && param->private_data_len)
1474                 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1475                             param->private_data_len);
1476 }
1477
1478 static int cm_validate_req_param(struct ib_cm_req_param *param)
1479 {
1480         if (!param->primary_path)
1481                 return -EINVAL;
1482
1483         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1484             param->qp_type != IB_QPT_XRC_INI)
1485                 return -EINVAL;
1486
1487         if (param->private_data &&
1488             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1489                 return -EINVAL;
1490
1491         if (param->alternate_path &&
1492             (param->alternate_path->pkey != param->primary_path->pkey ||
1493              param->alternate_path->mtu != param->primary_path->mtu))
1494                 return -EINVAL;
1495
1496         return 0;
1497 }
1498
1499 int ib_send_cm_req(struct ib_cm_id *cm_id,
1500                    struct ib_cm_req_param *param)
1501 {
1502         struct cm_id_private *cm_id_priv;
1503         struct cm_req_msg *req_msg;
1504         unsigned long flags;
1505         int ret;
1506
1507         ret = cm_validate_req_param(param);
1508         if (ret)
1509                 return ret;
1510
1511         /* Verify that we're not in timewait. */
1512         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1513         spin_lock_irqsave(&cm_id_priv->lock, flags);
1514         if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1515                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1516                 ret = -EINVAL;
1517                 goto out;
1518         }
1519         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1520
1521         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1522                                                             id.local_id);
1523         if (IS_ERR(cm_id_priv->timewait_info)) {
1524                 ret = PTR_ERR(cm_id_priv->timewait_info);
1525                 goto out;
1526         }
1527
1528         ret = cm_init_av_by_path(param->primary_path,
1529                                  param->ppath_sgid_attr, &cm_id_priv->av,
1530                                  cm_id_priv);
1531         if (ret)
1532                 goto out;
1533         if (param->alternate_path) {
1534                 ret = cm_init_av_by_path(param->alternate_path, NULL,
1535                                          &cm_id_priv->alt_av, cm_id_priv);
1536                 if (ret)
1537                         goto out;
1538         }
1539         cm_id->service_id = param->service_id;
1540         cm_id->service_mask = ~cpu_to_be64(0);
1541         cm_id_priv->timeout_ms = cm_convert_to_ms(
1542                                     param->primary_path->packet_life_time) * 2 +
1543                                  cm_convert_to_ms(
1544                                     param->remote_cm_response_timeout);
1545         cm_id_priv->max_cm_retries = param->max_cm_retries;
1546         cm_id_priv->initiator_depth = param->initiator_depth;
1547         cm_id_priv->responder_resources = param->responder_resources;
1548         cm_id_priv->retry_count = param->retry_count;
1549         cm_id_priv->path_mtu = param->primary_path->mtu;
1550         cm_id_priv->pkey = param->primary_path->pkey;
1551         cm_id_priv->qp_type = param->qp_type;
1552
1553         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1554         if (ret)
1555                 goto out;
1556
1557         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1558         cm_format_req(req_msg, cm_id_priv, param);
1559         cm_id_priv->tid = req_msg->hdr.tid;
1560         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1561         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1562
1563         cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1564         cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1565
1566         spin_lock_irqsave(&cm_id_priv->lock, flags);
1567         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1568         if (ret) {
1569                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1570                 goto error2;
1571         }
1572         BUG_ON(cm_id->state != IB_CM_IDLE);
1573         cm_id->state = IB_CM_REQ_SENT;
1574         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1575         return 0;
1576
1577 error2: cm_free_msg(cm_id_priv->msg);
1578 out:    return ret;
1579 }
1580 EXPORT_SYMBOL(ib_send_cm_req);
1581
1582 static int cm_issue_rej(struct cm_port *port,
1583                         struct ib_mad_recv_wc *mad_recv_wc,
1584                         enum ib_cm_rej_reason reason,
1585                         enum cm_msg_response msg_rejected,
1586                         void *ari, u8 ari_length)
1587 {
1588         struct ib_mad_send_buf *msg = NULL;
1589         struct cm_rej_msg *rej_msg, *rcv_msg;
1590         int ret;
1591
1592         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1593         if (ret)
1594                 return ret;
1595
1596         /* We just need common CM header information.  Cast to any message. */
1597         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1598         rej_msg = (struct cm_rej_msg *) msg->mad;
1599
1600         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1601         IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1602                 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1603         IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1604                 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1605         IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1606         IBA_SET(CM_REJ_REASON, rej_msg, reason);
1607
1608         if (ari && ari_length) {
1609                 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1610                 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1611         }
1612
1613         ret = ib_post_send_mad(msg, NULL);
1614         if (ret)
1615                 cm_free_msg(msg);
1616
1617         return ret;
1618 }
1619
1620 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1621 {
1622         return ((cpu_to_be16(
1623                         IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1624                 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1625                                                req_msg))));
1626 }
1627
1628 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1629                                  struct sa_path_rec *path, union ib_gid *gid)
1630 {
1631         if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1632                 path->rec_type = SA_PATH_REC_TYPE_OPA;
1633         else
1634                 path->rec_type = SA_PATH_REC_TYPE_IB;
1635 }
1636
1637 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1638                                         struct sa_path_rec *primary_path,
1639                                         struct sa_path_rec *alt_path)
1640 {
1641         u32 lid;
1642
1643         if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1644                 sa_path_set_dlid(primary_path,
1645                                  IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
1646                                          req_msg));
1647                 sa_path_set_slid(primary_path,
1648                                  IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1649                                          req_msg));
1650         } else {
1651                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1652                         CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1653                 sa_path_set_dlid(primary_path, lid);
1654
1655                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1656                         CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1657                 sa_path_set_slid(primary_path, lid);
1658         }
1659
1660         if (!cm_req_has_alt_path(req_msg))
1661                 return;
1662
1663         if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1664                 sa_path_set_dlid(alt_path,
1665                                  IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1666                                          req_msg));
1667                 sa_path_set_slid(alt_path,
1668                                  IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1669                                          req_msg));
1670         } else {
1671                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1672                         CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1673                 sa_path_set_dlid(alt_path, lid);
1674
1675                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1676                         CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1677                 sa_path_set_slid(alt_path, lid);
1678         }
1679 }
1680
1681 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1682                                      struct sa_path_rec *primary_path,
1683                                      struct sa_path_rec *alt_path)
1684 {
1685         primary_path->dgid =
1686                 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1687         primary_path->sgid =
1688                 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1689         primary_path->flow_label =
1690                 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1691         primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1692         primary_path->traffic_class =
1693                 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1694         primary_path->reversible = 1;
1695         primary_path->pkey =
1696                 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1697         primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1698         primary_path->mtu_selector = IB_SA_EQ;
1699         primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1700         primary_path->rate_selector = IB_SA_EQ;
1701         primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1702         primary_path->packet_life_time_selector = IB_SA_EQ;
1703         primary_path->packet_life_time =
1704                 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1705         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1706         primary_path->service_id =
1707                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1708         if (sa_path_is_roce(primary_path))
1709                 primary_path->roce.route_resolved = false;
1710
1711         if (cm_req_has_alt_path(req_msg)) {
1712                 alt_path->dgid = *IBA_GET_MEM_PTR(
1713                         CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1714                 alt_path->sgid = *IBA_GET_MEM_PTR(
1715                         CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1716                 alt_path->flow_label = cpu_to_be32(
1717                         IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1718                 alt_path->hop_limit =
1719                         IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1720                 alt_path->traffic_class =
1721                         IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1722                 alt_path->reversible = 1;
1723                 alt_path->pkey =
1724                         cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1725                 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1726                 alt_path->mtu_selector = IB_SA_EQ;
1727                 alt_path->mtu =
1728                         IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1729                 alt_path->rate_selector = IB_SA_EQ;
1730                 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1731                 alt_path->packet_life_time_selector = IB_SA_EQ;
1732                 alt_path->packet_life_time =
1733                         IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1734                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1735                 alt_path->service_id =
1736                         cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1737
1738                 if (sa_path_is_roce(alt_path))
1739                         alt_path->roce.route_resolved = false;
1740         }
1741         cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1742 }
1743
1744 static u16 cm_get_bth_pkey(struct cm_work *work)
1745 {
1746         struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1747         u8 port_num = work->port->port_num;
1748         u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1749         u16 pkey;
1750         int ret;
1751
1752         ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1753         if (ret) {
1754                 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1755                                      port_num, pkey_index, ret);
1756                 return 0;
1757         }
1758
1759         return pkey;
1760 }
1761
1762 /**
1763  * Convert OPA SGID to IB SGID
1764  * ULPs (such as IPoIB) do not understand OPA GIDs and will
1765  * reject them as the local_gid will not match the sgid. Therefore,
1766  * change the pathrec's SGID to an IB SGID.
1767  *
1768  * @work: Work completion
1769  * @path: Path record
1770  */
1771 static void cm_opa_to_ib_sgid(struct cm_work *work,
1772                               struct sa_path_rec *path)
1773 {
1774         struct ib_device *dev = work->port->cm_dev->ib_device;
1775         u8 port_num = work->port->port_num;
1776
1777         if (rdma_cap_opa_ah(dev, port_num) &&
1778             (ib_is_opa_gid(&path->sgid))) {
1779                 union ib_gid sgid;
1780
1781                 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1782                         dev_warn(&dev->dev,
1783                                  "Error updating sgid in CM request\n");
1784                         return;
1785                 }
1786
1787                 path->sgid = sgid;
1788         }
1789 }
1790
1791 static void cm_format_req_event(struct cm_work *work,
1792                                 struct cm_id_private *cm_id_priv,
1793                                 struct ib_cm_id *listen_id)
1794 {
1795         struct cm_req_msg *req_msg;
1796         struct ib_cm_req_event_param *param;
1797
1798         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1799         param = &work->cm_event.param.req_rcvd;
1800         param->listen_id = listen_id;
1801         param->bth_pkey = cm_get_bth_pkey(work);
1802         param->port = cm_id_priv->av.port->port_num;
1803         param->primary_path = &work->path[0];
1804         cm_opa_to_ib_sgid(work, param->primary_path);
1805         if (cm_req_has_alt_path(req_msg)) {
1806                 param->alternate_path = &work->path[1];
1807                 cm_opa_to_ib_sgid(work, param->alternate_path);
1808         } else {
1809                 param->alternate_path = NULL;
1810         }
1811         param->remote_ca_guid =
1812                 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1813         param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1814         param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1815         param->qp_type = cm_req_get_qp_type(req_msg);
1816         param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1817         param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1818         param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1819         param->local_cm_response_timeout =
1820                 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1821         param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1822         param->remote_cm_response_timeout =
1823                 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1824         param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1825         param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1826         param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1827         param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1828         param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1829         param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1830
1831         work->cm_event.private_data =
1832                 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1833 }
1834
1835 static void cm_process_work(struct cm_id_private *cm_id_priv,
1836                             struct cm_work *work)
1837 {
1838         int ret;
1839
1840         /* We will typically only have the current event to report. */
1841         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1842         cm_free_work(work);
1843
1844         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1845                 spin_lock_irq(&cm_id_priv->lock);
1846                 work = cm_dequeue_work(cm_id_priv);
1847                 spin_unlock_irq(&cm_id_priv->lock);
1848                 if (!work)
1849                         return;
1850
1851                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1852                                                 &work->cm_event);
1853                 cm_free_work(work);
1854         }
1855         cm_deref_id(cm_id_priv);
1856         if (ret)
1857                 cm_destroy_id(&cm_id_priv->id, ret);
1858 }
1859
1860 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1861                           struct cm_id_private *cm_id_priv,
1862                           enum cm_msg_response msg_mraed, u8 service_timeout,
1863                           const void *private_data, u8 private_data_len)
1864 {
1865         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1866         IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1867         IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1868                 be32_to_cpu(cm_id_priv->id.local_id));
1869         IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1870                 be32_to_cpu(cm_id_priv->id.remote_id));
1871         IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1872
1873         if (private_data && private_data_len)
1874                 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1875                             private_data_len);
1876 }
1877
1878 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1879                           struct cm_id_private *cm_id_priv,
1880                           enum ib_cm_rej_reason reason, void *ari,
1881                           u8 ari_length, const void *private_data,
1882                           u8 private_data_len, enum ib_cm_state state)
1883 {
1884         lockdep_assert_held(&cm_id_priv->lock);
1885
1886         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1887         IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1888                 be32_to_cpu(cm_id_priv->id.remote_id));
1889
1890         switch (state) {
1891         case IB_CM_REQ_RCVD:
1892                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1893                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1894                 break;
1895         case IB_CM_MRA_REQ_SENT:
1896                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1897                         be32_to_cpu(cm_id_priv->id.local_id));
1898                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1899                 break;
1900         case IB_CM_REP_RCVD:
1901         case IB_CM_MRA_REP_SENT:
1902                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1903                         be32_to_cpu(cm_id_priv->id.local_id));
1904                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1905                 break;
1906         default:
1907                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1908                         be32_to_cpu(cm_id_priv->id.local_id));
1909                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1910                         CM_MSG_RESPONSE_OTHER);
1911                 break;
1912         }
1913
1914         IBA_SET(CM_REJ_REASON, rej_msg, reason);
1915         if (ari && ari_length) {
1916                 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1917                 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1918         }
1919
1920         if (private_data && private_data_len)
1921                 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1922                             private_data_len);
1923 }
1924
1925 static void cm_dup_req_handler(struct cm_work *work,
1926                                struct cm_id_private *cm_id_priv)
1927 {
1928         struct ib_mad_send_buf *msg = NULL;
1929         int ret;
1930
1931         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1932                         counter[CM_REQ_COUNTER]);
1933
1934         /* Quick state check to discard duplicate REQs. */
1935         spin_lock_irq(&cm_id_priv->lock);
1936         if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1937                 spin_unlock_irq(&cm_id_priv->lock);
1938                 return;
1939         }
1940         spin_unlock_irq(&cm_id_priv->lock);
1941
1942         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1943         if (ret)
1944                 return;
1945
1946         spin_lock_irq(&cm_id_priv->lock);
1947         switch (cm_id_priv->id.state) {
1948         case IB_CM_MRA_REQ_SENT:
1949                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1950                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1951                               cm_id_priv->private_data,
1952                               cm_id_priv->private_data_len);
1953                 break;
1954         case IB_CM_TIMEWAIT:
1955                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1956                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1957                               IB_CM_TIMEWAIT);
1958                 break;
1959         default:
1960                 goto unlock;
1961         }
1962         spin_unlock_irq(&cm_id_priv->lock);
1963
1964         ret = ib_post_send_mad(msg, NULL);
1965         if (ret)
1966                 goto free;
1967         return;
1968
1969 unlock: spin_unlock_irq(&cm_id_priv->lock);
1970 free:   cm_free_msg(msg);
1971 }
1972
1973 static struct cm_id_private * cm_match_req(struct cm_work *work,
1974                                            struct cm_id_private *cm_id_priv)
1975 {
1976         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1977         struct cm_timewait_info *timewait_info;
1978         struct cm_req_msg *req_msg;
1979
1980         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1981
1982         /* Check for possible duplicate REQ. */
1983         spin_lock_irq(&cm.lock);
1984         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1985         if (timewait_info) {
1986                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1987                                            timewait_info->work.remote_id);
1988                 spin_unlock_irq(&cm.lock);
1989                 if (cur_cm_id_priv) {
1990                         cm_dup_req_handler(work, cur_cm_id_priv);
1991                         cm_deref_id(cur_cm_id_priv);
1992                 }
1993                 return NULL;
1994         }
1995
1996         /* Check for stale connections. */
1997         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1998         if (timewait_info) {
1999                 cm_remove_remote(cm_id_priv);
2000                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2001                                            timewait_info->work.remote_id);
2002
2003                 spin_unlock_irq(&cm.lock);
2004                 cm_issue_rej(work->port, work->mad_recv_wc,
2005                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
2006                              NULL, 0);
2007                 if (cur_cm_id_priv) {
2008                         ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2009                         cm_deref_id(cur_cm_id_priv);
2010                 }
2011                 return NULL;
2012         }
2013
2014         /* Find matching listen request. */
2015         listen_cm_id_priv = cm_find_listen(
2016                 cm_id_priv->id.device,
2017                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2018         if (!listen_cm_id_priv) {
2019                 cm_remove_remote(cm_id_priv);
2020                 spin_unlock_irq(&cm.lock);
2021                 cm_issue_rej(work->port, work->mad_recv_wc,
2022                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2023                              NULL, 0);
2024                 return NULL;
2025         }
2026         spin_unlock_irq(&cm.lock);
2027         return listen_cm_id_priv;
2028 }
2029
2030 /*
2031  * Work-around for inter-subnet connections.  If the LIDs are permissive,
2032  * we need to override the LID/SL data in the REQ with the LID information
2033  * in the work completion.
2034  */
2035 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2036 {
2037         if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2038                 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2039                                         req_msg)) == IB_LID_PERMISSIVE) {
2040                         IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2041                                 be16_to_cpu(ib_lid_be16(wc->slid)));
2042                         IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2043                 }
2044
2045                 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2046                                         req_msg)) == IB_LID_PERMISSIVE)
2047                         IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2048                                 wc->dlid_path_bits);
2049         }
2050
2051         if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2052                 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2053                                         req_msg)) == IB_LID_PERMISSIVE) {
2054                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2055                                 be16_to_cpu(ib_lid_be16(wc->slid)));
2056                         IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2057                 }
2058
2059                 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2060                                         req_msg)) == IB_LID_PERMISSIVE)
2061                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2062                                 wc->dlid_path_bits);
2063         }
2064 }
2065
2066 static int cm_req_handler(struct cm_work *work)
2067 {
2068         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2069         struct cm_req_msg *req_msg;
2070         const struct ib_global_route *grh;
2071         const struct ib_gid_attr *gid_attr;
2072         int ret;
2073
2074         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2075
2076         cm_id_priv =
2077                 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2078         if (IS_ERR(cm_id_priv))
2079                 return PTR_ERR(cm_id_priv);
2080
2081         cm_id_priv->id.remote_id =
2082                 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2083         cm_id_priv->id.service_id =
2084                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2085         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
2086         cm_id_priv->tid = req_msg->hdr.tid;
2087         cm_id_priv->timeout_ms = cm_convert_to_ms(
2088                 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2089         cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2090         cm_id_priv->remote_qpn =
2091                 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2092         cm_id_priv->initiator_depth =
2093                 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2094         cm_id_priv->responder_resources =
2095                 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2096         cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2097         cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2098         cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2099         cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2100         cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2101         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2102
2103         ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2104                                       work->mad_recv_wc->recv_buf.grh,
2105                                       &cm_id_priv->av);
2106         if (ret)
2107                 goto destroy;
2108         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2109                                                             id.local_id);
2110         if (IS_ERR(cm_id_priv->timewait_info)) {
2111                 ret = PTR_ERR(cm_id_priv->timewait_info);
2112                 goto destroy;
2113         }
2114         cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2115         cm_id_priv->timewait_info->remote_ca_guid =
2116                 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2117         cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2118
2119         /*
2120          * Note that the ID pointer is not in the xarray at this point,
2121          * so this set is only visible to the local thread.
2122          */
2123         cm_id_priv->id.state = IB_CM_REQ_RCVD;
2124
2125         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2126         if (!listen_cm_id_priv) {
2127                 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__,
2128                          be32_to_cpu(cm_id_priv->id.local_id));
2129                 cm_id_priv->id.state = IB_CM_IDLE;
2130                 ret = -EINVAL;
2131                 goto destroy;
2132         }
2133
2134         cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2135
2136         memset(&work->path[0], 0, sizeof(work->path[0]));
2137         if (cm_req_has_alt_path(req_msg))
2138                 memset(&work->path[1], 0, sizeof(work->path[1]));
2139         grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2140         gid_attr = grh->sgid_attr;
2141
2142         if (gid_attr &&
2143             rdma_protocol_roce(work->port->cm_dev->ib_device,
2144                                work->port->port_num)) {
2145                 work->path[0].rec_type =
2146                         sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2147         } else {
2148                 cm_path_set_rec_type(
2149                         work->port->cm_dev->ib_device, work->port->port_num,
2150                         &work->path[0],
2151                         IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2152                                         req_msg));
2153         }
2154         if (cm_req_has_alt_path(req_msg))
2155                 work->path[1].rec_type = work->path[0].rec_type;
2156         cm_format_paths_from_req(req_msg, &work->path[0],
2157                                  &work->path[1]);
2158         if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2159                 sa_path_set_dmac(&work->path[0],
2160                                  cm_id_priv->av.ah_attr.roce.dmac);
2161         work->path[0].hop_limit = grh->hop_limit;
2162         ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2163                                  cm_id_priv);
2164         if (ret) {
2165                 int err;
2166
2167                 err = rdma_query_gid(work->port->cm_dev->ib_device,
2168                                      work->port->port_num, 0,
2169                                      &work->path[0].sgid);
2170                 if (err)
2171                         ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2172                                        NULL, 0, NULL, 0);
2173                 else
2174                         ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2175                                        &work->path[0].sgid,
2176                                        sizeof(work->path[0].sgid),
2177                                        NULL, 0);
2178                 goto rejected;
2179         }
2180         if (cm_req_has_alt_path(req_msg)) {
2181                 ret = cm_init_av_by_path(&work->path[1], NULL,
2182                                          &cm_id_priv->alt_av, cm_id_priv);
2183                 if (ret) {
2184                         ib_send_cm_rej(&cm_id_priv->id,
2185                                        IB_CM_REJ_INVALID_ALT_GID,
2186                                        &work->path[0].sgid,
2187                                        sizeof(work->path[0].sgid), NULL, 0);
2188                         goto rejected;
2189                 }
2190         }
2191
2192         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2193         cm_id_priv->id.context = listen_cm_id_priv->id.context;
2194         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2195
2196         /* Now MAD handlers can see the new ID */
2197         spin_lock_irq(&cm_id_priv->lock);
2198         cm_finalize_id(cm_id_priv);
2199
2200         /* Refcount belongs to the event, pairs with cm_process_work() */
2201         refcount_inc(&cm_id_priv->refcount);
2202         cm_queue_work_unlock(cm_id_priv, work);
2203         /*
2204          * Since this ID was just created and was not made visible to other MAD
2205          * handlers until the cm_finalize_id() above we know that the
2206          * cm_process_work() will deliver the event and the listen_cm_id
2207          * embedded in the event can be derefed here.
2208          */
2209         cm_deref_id(listen_cm_id_priv);
2210         return 0;
2211
2212 rejected:
2213         cm_deref_id(listen_cm_id_priv);
2214 destroy:
2215         ib_destroy_cm_id(&cm_id_priv->id);
2216         return ret;
2217 }
2218
2219 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2220                           struct cm_id_private *cm_id_priv,
2221                           struct ib_cm_rep_param *param)
2222 {
2223         cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2224                               param->ece.attr_mod);
2225         IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2226                 be32_to_cpu(cm_id_priv->id.local_id));
2227         IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2228                 be32_to_cpu(cm_id_priv->id.remote_id));
2229         IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2230         IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2231                 param->responder_resources);
2232         IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2233                 cm_id_priv->av.port->cm_dev->ack_delay);
2234         IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2235         IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2236         IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2237                 be64_to_cpu(cm_id_priv->id.device->node_guid));
2238
2239         if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2240                 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2241                         param->initiator_depth);
2242                 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2243                         param->flow_control);
2244                 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2245                 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2246         } else {
2247                 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2248                 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2249         }
2250
2251         IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2252         IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2253         IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2254
2255         if (param->private_data && param->private_data_len)
2256                 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2257                             param->private_data_len);
2258 }
2259
2260 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2261                    struct ib_cm_rep_param *param)
2262 {
2263         struct cm_id_private *cm_id_priv;
2264         struct ib_mad_send_buf *msg;
2265         struct cm_rep_msg *rep_msg;
2266         unsigned long flags;
2267         int ret;
2268
2269         if (param->private_data &&
2270             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2271                 return -EINVAL;
2272
2273         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2274         spin_lock_irqsave(&cm_id_priv->lock, flags);
2275         if (cm_id->state != IB_CM_REQ_RCVD &&
2276             cm_id->state != IB_CM_MRA_REQ_SENT) {
2277                 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__,
2278                          be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2279                 ret = -EINVAL;
2280                 goto out;
2281         }
2282
2283         ret = cm_alloc_msg(cm_id_priv, &msg);
2284         if (ret)
2285                 goto out;
2286
2287         rep_msg = (struct cm_rep_msg *) msg->mad;
2288         cm_format_rep(rep_msg, cm_id_priv, param);
2289         msg->timeout_ms = cm_id_priv->timeout_ms;
2290         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2291
2292         ret = ib_post_send_mad(msg, NULL);
2293         if (ret) {
2294                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2295                 cm_free_msg(msg);
2296                 return ret;
2297         }
2298
2299         cm_id->state = IB_CM_REP_SENT;
2300         cm_id_priv->msg = msg;
2301         cm_id_priv->initiator_depth = param->initiator_depth;
2302         cm_id_priv->responder_resources = param->responder_resources;
2303         cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2304         WARN_ONCE(param->qp_num & 0xFF000000,
2305                   "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2306                   param->qp_num);
2307         cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2308
2309 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2310         return ret;
2311 }
2312 EXPORT_SYMBOL(ib_send_cm_rep);
2313
2314 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2315                           struct cm_id_private *cm_id_priv,
2316                           const void *private_data,
2317                           u8 private_data_len)
2318 {
2319         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2320         IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2321                 be32_to_cpu(cm_id_priv->id.local_id));
2322         IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2323                 be32_to_cpu(cm_id_priv->id.remote_id));
2324
2325         if (private_data && private_data_len)
2326                 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2327                             private_data_len);
2328 }
2329
2330 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2331                    const void *private_data,
2332                    u8 private_data_len)
2333 {
2334         struct cm_id_private *cm_id_priv;
2335         struct ib_mad_send_buf *msg;
2336         unsigned long flags;
2337         void *data;
2338         int ret;
2339
2340         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2341                 return -EINVAL;
2342
2343         data = cm_copy_private_data(private_data, private_data_len);
2344         if (IS_ERR(data))
2345                 return PTR_ERR(data);
2346
2347         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2348         spin_lock_irqsave(&cm_id_priv->lock, flags);
2349         if (cm_id->state != IB_CM_REP_RCVD &&
2350             cm_id->state != IB_CM_MRA_REP_SENT) {
2351                 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__,
2352                          be32_to_cpu(cm_id->local_id), cm_id->state);
2353                 ret = -EINVAL;
2354                 goto error;
2355         }
2356
2357         ret = cm_alloc_msg(cm_id_priv, &msg);
2358         if (ret)
2359                 goto error;
2360
2361         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2362                       private_data, private_data_len);
2363
2364         ret = ib_post_send_mad(msg, NULL);
2365         if (ret) {
2366                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2367                 cm_free_msg(msg);
2368                 kfree(data);
2369                 return ret;
2370         }
2371
2372         cm_id->state = IB_CM_ESTABLISHED;
2373         cm_set_private_data(cm_id_priv, data, private_data_len);
2374         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2375         return 0;
2376
2377 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2378         kfree(data);
2379         return ret;
2380 }
2381 EXPORT_SYMBOL(ib_send_cm_rtu);
2382
2383 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2384 {
2385         struct cm_rep_msg *rep_msg;
2386         struct ib_cm_rep_event_param *param;
2387
2388         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2389         param = &work->cm_event.param.rep_rcvd;
2390         param->remote_ca_guid =
2391                 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2392         param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2393         param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2394         param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2395         param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2396         param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2397         param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2398         param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2399         param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2400         param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2401         param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2402         param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2403         param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2404         param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2405         param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2406
2407         work->cm_event.private_data =
2408                 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2409 }
2410
2411 static void cm_dup_rep_handler(struct cm_work *work)
2412 {
2413         struct cm_id_private *cm_id_priv;
2414         struct cm_rep_msg *rep_msg;
2415         struct ib_mad_send_buf *msg = NULL;
2416         int ret;
2417
2418         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2419         cm_id_priv = cm_acquire_id(
2420                 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2421                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2422         if (!cm_id_priv)
2423                 return;
2424
2425         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2426                         counter[CM_REP_COUNTER]);
2427         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2428         if (ret)
2429                 goto deref;
2430
2431         spin_lock_irq(&cm_id_priv->lock);
2432         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2433                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2434                               cm_id_priv->private_data,
2435                               cm_id_priv->private_data_len);
2436         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2437                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2438                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2439                               cm_id_priv->private_data,
2440                               cm_id_priv->private_data_len);
2441         else
2442                 goto unlock;
2443         spin_unlock_irq(&cm_id_priv->lock);
2444
2445         ret = ib_post_send_mad(msg, NULL);
2446         if (ret)
2447                 goto free;
2448         goto deref;
2449
2450 unlock: spin_unlock_irq(&cm_id_priv->lock);
2451 free:   cm_free_msg(msg);
2452 deref:  cm_deref_id(cm_id_priv);
2453 }
2454
2455 static int cm_rep_handler(struct cm_work *work)
2456 {
2457         struct cm_id_private *cm_id_priv;
2458         struct cm_rep_msg *rep_msg;
2459         int ret;
2460         struct cm_id_private *cur_cm_id_priv;
2461         struct cm_timewait_info *timewait_info;
2462
2463         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2464         cm_id_priv = cm_acquire_id(
2465                 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2466         if (!cm_id_priv) {
2467                 cm_dup_rep_handler(work);
2468                 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__,
2469                          IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2470                 return -EINVAL;
2471         }
2472
2473         cm_format_rep_event(work, cm_id_priv->qp_type);
2474
2475         spin_lock_irq(&cm_id_priv->lock);
2476         switch (cm_id_priv->id.state) {
2477         case IB_CM_REQ_SENT:
2478         case IB_CM_MRA_REQ_RCVD:
2479                 break;
2480         default:
2481                 ret = -EINVAL;
2482                 pr_debug(
2483                         "%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
2484                         __func__, cm_id_priv->id.state,
2485                         IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2486                         IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2487                 spin_unlock_irq(&cm_id_priv->lock);
2488                 goto error;
2489         }
2490
2491         cm_id_priv->timewait_info->work.remote_id =
2492                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2493         cm_id_priv->timewait_info->remote_ca_guid =
2494                 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2495         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2496
2497         spin_lock(&cm.lock);
2498         /* Check for duplicate REP. */
2499         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2500                 spin_unlock(&cm.lock);
2501                 spin_unlock_irq(&cm_id_priv->lock);
2502                 ret = -EINVAL;
2503                 pr_debug("%s: Failed to insert remote id %d\n", __func__,
2504                          IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2505                 goto error;
2506         }
2507         /* Check for a stale connection. */
2508         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2509         if (timewait_info) {
2510                 cm_remove_remote(cm_id_priv);
2511                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2512                                            timewait_info->work.remote_id);
2513
2514                 spin_unlock(&cm.lock);
2515                 spin_unlock_irq(&cm_id_priv->lock);
2516                 cm_issue_rej(work->port, work->mad_recv_wc,
2517                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2518                              NULL, 0);
2519                 ret = -EINVAL;
2520                 pr_debug(
2521                         "%s: Stale connection. local_comm_id %d, remote_comm_id %d\n",
2522                         __func__, 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->av.port->mad_agent, 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->av.port->mad_agent, 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->counter_group[CM_RECV_DUPLICATES].
2605                                 counter[CM_RTU_COUNTER]);
2606                 goto out;
2607         }
2608         cm_id_priv->id.state = IB_CM_ESTABLISHED;
2609
2610         ib_cancel_mad(cm_id_priv->av.port->mad_agent, 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                 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2650                          be32_to_cpu(cm_id_priv->id.local_id),
2651                          cm_id_priv->id.state);
2652                 return -EINVAL;
2653         }
2654
2655         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2656             cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2657                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2658
2659         ret = cm_alloc_msg(cm_id_priv, &msg);
2660         if (ret) {
2661                 cm_enter_timewait(cm_id_priv);
2662                 return ret;
2663         }
2664
2665         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2666                        private_data, private_data_len);
2667         msg->timeout_ms = cm_id_priv->timeout_ms;
2668         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2669
2670         ret = ib_post_send_mad(msg, NULL);
2671         if (ret) {
2672                 cm_enter_timewait(cm_id_priv);
2673                 cm_free_msg(msg);
2674                 return ret;
2675         }
2676
2677         cm_id_priv->id.state = IB_CM_DREQ_SENT;
2678         cm_id_priv->msg = msg;
2679         return 0;
2680 }
2681
2682 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2683                     u8 private_data_len)
2684 {
2685         struct cm_id_private *cm_id_priv =
2686                 container_of(cm_id, struct cm_id_private, id);
2687         unsigned long flags;
2688         int ret;
2689
2690         spin_lock_irqsave(&cm_id_priv->lock, flags);
2691         ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2692         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2693         return ret;
2694 }
2695 EXPORT_SYMBOL(ib_send_cm_dreq);
2696
2697 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2698                           struct cm_id_private *cm_id_priv,
2699                           const void *private_data,
2700                           u8 private_data_len)
2701 {
2702         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2703         IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2704                 be32_to_cpu(cm_id_priv->id.local_id));
2705         IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2706                 be32_to_cpu(cm_id_priv->id.remote_id));
2707
2708         if (private_data && private_data_len)
2709                 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2710                             private_data_len);
2711 }
2712
2713 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2714                                void *private_data, u8 private_data_len)
2715 {
2716         struct ib_mad_send_buf *msg;
2717         int ret;
2718
2719         lockdep_assert_held(&cm_id_priv->lock);
2720
2721         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2722                 return -EINVAL;
2723
2724         if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2725                 pr_debug(
2726                         "%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
2727                         __func__, be32_to_cpu(cm_id_priv->id.local_id),
2728                         cm_id_priv->id.state);
2729                 kfree(private_data);
2730                 return -EINVAL;
2731         }
2732
2733         cm_set_private_data(cm_id_priv, private_data, private_data_len);
2734         cm_enter_timewait(cm_id_priv);
2735
2736         ret = cm_alloc_msg(cm_id_priv, &msg);
2737         if (ret)
2738                 return ret;
2739
2740         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2741                        private_data, private_data_len);
2742
2743         ret = ib_post_send_mad(msg, NULL);
2744         if (ret) {
2745                 cm_free_msg(msg);
2746                 return ret;
2747         }
2748         return 0;
2749 }
2750
2751 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2752                     u8 private_data_len)
2753 {
2754         struct cm_id_private *cm_id_priv =
2755                 container_of(cm_id, struct cm_id_private, id);
2756         unsigned long flags;
2757         void *data;
2758         int ret;
2759
2760         data = cm_copy_private_data(private_data, private_data_len);
2761         if (IS_ERR(data))
2762                 return PTR_ERR(data);
2763
2764         spin_lock_irqsave(&cm_id_priv->lock, flags);
2765         ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2766         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2767         return ret;
2768 }
2769 EXPORT_SYMBOL(ib_send_cm_drep);
2770
2771 static int cm_issue_drep(struct cm_port *port,
2772                          struct ib_mad_recv_wc *mad_recv_wc)
2773 {
2774         struct ib_mad_send_buf *msg = NULL;
2775         struct cm_dreq_msg *dreq_msg;
2776         struct cm_drep_msg *drep_msg;
2777         int ret;
2778
2779         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2780         if (ret)
2781                 return ret;
2782
2783         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2784         drep_msg = (struct cm_drep_msg *) msg->mad;
2785
2786         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2787         IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2788                 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2789         IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2790                 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2791
2792         ret = ib_post_send_mad(msg, NULL);
2793         if (ret)
2794                 cm_free_msg(msg);
2795
2796         return ret;
2797 }
2798
2799 static int cm_dreq_handler(struct cm_work *work)
2800 {
2801         struct cm_id_private *cm_id_priv;
2802         struct cm_dreq_msg *dreq_msg;
2803         struct ib_mad_send_buf *msg = NULL;
2804
2805         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2806         cm_id_priv = cm_acquire_id(
2807                 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2808                 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2809         if (!cm_id_priv) {
2810                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2811                                 counter[CM_DREQ_COUNTER]);
2812                 cm_issue_drep(work->port, work->mad_recv_wc);
2813                 pr_debug(
2814                         "%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n",
2815                         __func__, IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2816                         IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2817                 return -EINVAL;
2818         }
2819
2820         work->cm_event.private_data =
2821                 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2822
2823         spin_lock_irq(&cm_id_priv->lock);
2824         if (cm_id_priv->local_qpn !=
2825             cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2826                 goto unlock;
2827
2828         switch (cm_id_priv->id.state) {
2829         case IB_CM_REP_SENT:
2830         case IB_CM_DREQ_SENT:
2831                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2832                 break;
2833         case IB_CM_ESTABLISHED:
2834                 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2835                     cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2836                         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2837                 break;
2838         case IB_CM_MRA_REP_RCVD:
2839                 break;
2840         case IB_CM_TIMEWAIT:
2841                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2842                                 counter[CM_DREQ_COUNTER]);
2843                 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2844                 if (IS_ERR(msg))
2845                         goto unlock;
2846
2847                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2848                                cm_id_priv->private_data,
2849                                cm_id_priv->private_data_len);
2850                 spin_unlock_irq(&cm_id_priv->lock);
2851
2852                 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2853                     ib_post_send_mad(msg, NULL))
2854                         cm_free_msg(msg);
2855                 goto deref;
2856         case IB_CM_DREQ_RCVD:
2857                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2858                                 counter[CM_DREQ_COUNTER]);
2859                 goto unlock;
2860         default:
2861                 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2862                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
2863                          cm_id_priv->id.state);
2864                 goto unlock;
2865         }
2866         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2867         cm_id_priv->tid = dreq_msg->hdr.tid;
2868         cm_queue_work_unlock(cm_id_priv, work);
2869         return 0;
2870
2871 unlock: spin_unlock_irq(&cm_id_priv->lock);
2872 deref:  cm_deref_id(cm_id_priv);
2873         return -EINVAL;
2874 }
2875
2876 static int cm_drep_handler(struct cm_work *work)
2877 {
2878         struct cm_id_private *cm_id_priv;
2879         struct cm_drep_msg *drep_msg;
2880
2881         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2882         cm_id_priv = cm_acquire_id(
2883                 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2884                 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2885         if (!cm_id_priv)
2886                 return -EINVAL;
2887
2888         work->cm_event.private_data =
2889                 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2890
2891         spin_lock_irq(&cm_id_priv->lock);
2892         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2893             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2894                 spin_unlock_irq(&cm_id_priv->lock);
2895                 goto out;
2896         }
2897         cm_enter_timewait(cm_id_priv);
2898
2899         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2900         cm_queue_work_unlock(cm_id_priv, work);
2901         return 0;
2902 out:
2903         cm_deref_id(cm_id_priv);
2904         return -EINVAL;
2905 }
2906
2907 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2908                               enum ib_cm_rej_reason reason, void *ari,
2909                               u8 ari_length, const void *private_data,
2910                               u8 private_data_len)
2911 {
2912         enum ib_cm_state state = cm_id_priv->id.state;
2913         struct ib_mad_send_buf *msg;
2914         int ret;
2915
2916         lockdep_assert_held(&cm_id_priv->lock);
2917
2918         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2919             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2920                 return -EINVAL;
2921
2922         switch (state) {
2923         case IB_CM_REQ_SENT:
2924         case IB_CM_MRA_REQ_RCVD:
2925         case IB_CM_REQ_RCVD:
2926         case IB_CM_MRA_REQ_SENT:
2927         case IB_CM_REP_RCVD:
2928         case IB_CM_MRA_REP_SENT:
2929                 cm_reset_to_idle(cm_id_priv);
2930                 ret = cm_alloc_msg(cm_id_priv, &msg);
2931                 if (ret)
2932                         return ret;
2933                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2934                               ari, ari_length, private_data, private_data_len,
2935                               state);
2936                 break;
2937         case IB_CM_REP_SENT:
2938         case IB_CM_MRA_REP_RCVD:
2939                 cm_enter_timewait(cm_id_priv);
2940                 ret = cm_alloc_msg(cm_id_priv, &msg);
2941                 if (ret)
2942                         return ret;
2943                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2944                               ari, ari_length, private_data, private_data_len,
2945                               state);
2946                 break;
2947         default:
2948                 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2949                          be32_to_cpu(cm_id_priv->id.local_id),
2950                          cm_id_priv->id.state);
2951                 return -EINVAL;
2952         }
2953
2954         ret = ib_post_send_mad(msg, NULL);
2955         if (ret) {
2956                 cm_free_msg(msg);
2957                 return ret;
2958         }
2959
2960         return 0;
2961 }
2962
2963 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2964                    void *ari, u8 ari_length, const void *private_data,
2965                    u8 private_data_len)
2966 {
2967         struct cm_id_private *cm_id_priv =
2968                 container_of(cm_id, struct cm_id_private, id);
2969         unsigned long flags;
2970         int ret;
2971
2972         spin_lock_irqsave(&cm_id_priv->lock, flags);
2973         ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2974                                  private_data, private_data_len);
2975         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2976         return ret;
2977 }
2978 EXPORT_SYMBOL(ib_send_cm_rej);
2979
2980 static void cm_format_rej_event(struct cm_work *work)
2981 {
2982         struct cm_rej_msg *rej_msg;
2983         struct ib_cm_rej_event_param *param;
2984
2985         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2986         param = &work->cm_event.param.rej_rcvd;
2987         param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2988         param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2989         param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2990         work->cm_event.private_data =
2991                 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2992 }
2993
2994 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2995 {
2996         struct cm_id_private *cm_id_priv;
2997         __be32 remote_id;
2998
2999         remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
3000
3001         if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
3002                 cm_id_priv = cm_find_remote_id(
3003                         *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
3004                         remote_id);
3005         } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3006                    CM_MSG_RESPONSE_REQ)
3007                 cm_id_priv = cm_acquire_id(
3008                         cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3009                         0);
3010         else
3011                 cm_id_priv = cm_acquire_id(
3012                         cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3013                         remote_id);
3014
3015         return cm_id_priv;
3016 }
3017
3018 static int cm_rej_handler(struct cm_work *work)
3019 {
3020         struct cm_id_private *cm_id_priv;
3021         struct cm_rej_msg *rej_msg;
3022
3023         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3024         cm_id_priv = cm_acquire_rejected_id(rej_msg);
3025         if (!cm_id_priv)
3026                 return -EINVAL;
3027
3028         cm_format_rej_event(work);
3029
3030         spin_lock_irq(&cm_id_priv->lock);
3031         switch (cm_id_priv->id.state) {
3032         case IB_CM_REQ_SENT:
3033         case IB_CM_MRA_REQ_RCVD:
3034         case IB_CM_REP_SENT:
3035         case IB_CM_MRA_REP_RCVD:
3036                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3037                 fallthrough;
3038         case IB_CM_REQ_RCVD:
3039         case IB_CM_MRA_REQ_SENT:
3040                 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3041                         cm_enter_timewait(cm_id_priv);
3042                 else
3043                         cm_reset_to_idle(cm_id_priv);
3044                 break;
3045         case IB_CM_DREQ_SENT:
3046                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3047                 fallthrough;
3048         case IB_CM_REP_RCVD:
3049         case IB_CM_MRA_REP_SENT:
3050                 cm_enter_timewait(cm_id_priv);
3051                 break;
3052         case IB_CM_ESTABLISHED:
3053                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3054                     cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3055                         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3056                                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
3057                                               cm_id_priv->msg);
3058                         cm_enter_timewait(cm_id_priv);
3059                         break;
3060                 }
3061                 fallthrough;
3062         default:
3063                 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
3064                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
3065                          cm_id_priv->id.state);
3066                 spin_unlock_irq(&cm_id_priv->lock);
3067                 goto out;
3068         }
3069
3070         cm_queue_work_unlock(cm_id_priv, work);
3071         return 0;
3072 out:
3073         cm_deref_id(cm_id_priv);
3074         return -EINVAL;
3075 }
3076
3077 int ib_send_cm_mra(struct ib_cm_id *cm_id,
3078                    u8 service_timeout,
3079                    const void *private_data,
3080                    u8 private_data_len)
3081 {
3082         struct cm_id_private *cm_id_priv;
3083         struct ib_mad_send_buf *msg;
3084         enum ib_cm_state cm_state;
3085         enum ib_cm_lap_state lap_state;
3086         enum cm_msg_response msg_response;
3087         void *data;
3088         unsigned long flags;
3089         int ret;
3090
3091         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3092                 return -EINVAL;
3093
3094         data = cm_copy_private_data(private_data, private_data_len);
3095         if (IS_ERR(data))
3096                 return PTR_ERR(data);
3097
3098         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3099
3100         spin_lock_irqsave(&cm_id_priv->lock, flags);
3101         switch(cm_id_priv->id.state) {
3102         case IB_CM_REQ_RCVD:
3103                 cm_state = IB_CM_MRA_REQ_SENT;
3104                 lap_state = cm_id->lap_state;
3105                 msg_response = CM_MSG_RESPONSE_REQ;
3106                 break;
3107         case IB_CM_REP_RCVD:
3108                 cm_state = IB_CM_MRA_REP_SENT;
3109                 lap_state = cm_id->lap_state;
3110                 msg_response = CM_MSG_RESPONSE_REP;
3111                 break;
3112         case IB_CM_ESTABLISHED:
3113                 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3114                         cm_state = cm_id->state;
3115                         lap_state = IB_CM_MRA_LAP_SENT;
3116                         msg_response = CM_MSG_RESPONSE_OTHER;
3117                         break;
3118                 }
3119                 fallthrough;
3120         default:
3121                 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
3122                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
3123                          cm_id_priv->id.state);
3124                 ret = -EINVAL;
3125                 goto error1;
3126         }
3127
3128         if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3129                 ret = cm_alloc_msg(cm_id_priv, &msg);
3130                 if (ret)
3131                         goto error1;
3132
3133                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3134                               msg_response, service_timeout,
3135                               private_data, private_data_len);
3136                 ret = ib_post_send_mad(msg, NULL);
3137                 if (ret)
3138                         goto error2;
3139         }
3140
3141         cm_id->state = cm_state;
3142         cm_id->lap_state = lap_state;
3143         cm_id_priv->service_timeout = service_timeout;
3144         cm_set_private_data(cm_id_priv, data, private_data_len);
3145         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3146         return 0;
3147
3148 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3149         kfree(data);
3150         return ret;
3151
3152 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3153         kfree(data);
3154         cm_free_msg(msg);
3155         return ret;
3156 }
3157 EXPORT_SYMBOL(ib_send_cm_mra);
3158
3159 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3160 {
3161         switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3162         case CM_MSG_RESPONSE_REQ:
3163                 return cm_acquire_id(
3164                         cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3165                         0);
3166         case CM_MSG_RESPONSE_REP:
3167         case CM_MSG_RESPONSE_OTHER:
3168                 return cm_acquire_id(
3169                         cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3170                         cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3171         default:
3172                 return NULL;
3173         }
3174 }
3175
3176 static int cm_mra_handler(struct cm_work *work)
3177 {
3178         struct cm_id_private *cm_id_priv;
3179         struct cm_mra_msg *mra_msg;
3180         int timeout;
3181
3182         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3183         cm_id_priv = cm_acquire_mraed_id(mra_msg);
3184         if (!cm_id_priv)
3185                 return -EINVAL;
3186
3187         work->cm_event.private_data =
3188                 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3189         work->cm_event.param.mra_rcvd.service_timeout =
3190                 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3191         timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3192                   cm_convert_to_ms(cm_id_priv->av.timeout);
3193
3194         spin_lock_irq(&cm_id_priv->lock);
3195         switch (cm_id_priv->id.state) {
3196         case IB_CM_REQ_SENT:
3197                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3198                             CM_MSG_RESPONSE_REQ ||
3199                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
3200                                   cm_id_priv->msg, timeout))
3201                         goto out;
3202                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3203                 break;
3204         case IB_CM_REP_SENT:
3205                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3206                             CM_MSG_RESPONSE_REP ||
3207                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
3208                                   cm_id_priv->msg, timeout))
3209                         goto out;
3210                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3211                 break;
3212         case IB_CM_ESTABLISHED:
3213                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3214                             CM_MSG_RESPONSE_OTHER ||
3215                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3216                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
3217                                   cm_id_priv->msg, timeout)) {
3218                         if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3219                                 atomic_long_inc(&work->port->
3220                                                 counter_group[CM_RECV_DUPLICATES].
3221                                                 counter[CM_MRA_COUNTER]);
3222                         goto out;
3223                 }
3224                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3225                 break;
3226         case IB_CM_MRA_REQ_RCVD:
3227         case IB_CM_MRA_REP_RCVD:
3228                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3229                                 counter[CM_MRA_COUNTER]);
3230                 fallthrough;
3231         default:
3232                 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n",
3233                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
3234                          cm_id_priv->id.state);
3235                 goto out;
3236         }
3237
3238         cm_id_priv->msg->context[1] = (void *) (unsigned long)
3239                                       cm_id_priv->id.state;
3240         cm_queue_work_unlock(cm_id_priv, work);
3241         return 0;
3242 out:
3243         spin_unlock_irq(&cm_id_priv->lock);
3244         cm_deref_id(cm_id_priv);
3245         return -EINVAL;
3246 }
3247
3248 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3249                                         struct sa_path_rec *path)
3250 {
3251         u32 lid;
3252
3253         if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3254                 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3255                                                lap_msg));
3256                 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3257                                                lap_msg));
3258         } else {
3259                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3260                         CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3261                 sa_path_set_dlid(path, lid);
3262
3263                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3264                         CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3265                 sa_path_set_slid(path, lid);
3266         }
3267 }
3268
3269 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3270                                     struct sa_path_rec *path,
3271                                     struct cm_lap_msg *lap_msg)
3272 {
3273         path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3274         path->sgid =
3275                 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3276         path->flow_label =
3277                 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3278         path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3279         path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3280         path->reversible = 1;
3281         path->pkey = cm_id_priv->pkey;
3282         path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3283         path->mtu_selector = IB_SA_EQ;
3284         path->mtu = cm_id_priv->path_mtu;
3285         path->rate_selector = IB_SA_EQ;
3286         path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3287         path->packet_life_time_selector = IB_SA_EQ;
3288         path->packet_life_time =
3289                 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3290         path->packet_life_time -= (path->packet_life_time > 0);
3291         cm_format_path_lid_from_lap(lap_msg, path);
3292 }
3293
3294 static int cm_lap_handler(struct cm_work *work)
3295 {
3296         struct cm_id_private *cm_id_priv;
3297         struct cm_lap_msg *lap_msg;
3298         struct ib_cm_lap_event_param *param;
3299         struct ib_mad_send_buf *msg = NULL;
3300         int ret;
3301
3302         /* Currently Alternate path messages are not supported for
3303          * RoCE link layer.
3304          */
3305         if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3306                                work->port->port_num))
3307                 return -EINVAL;
3308
3309         /* todo: verify LAP request and send reject APR if invalid. */
3310         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3311         cm_id_priv = cm_acquire_id(
3312                 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3313                 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3314         if (!cm_id_priv)
3315                 return -EINVAL;
3316
3317         param = &work->cm_event.param.lap_rcvd;
3318         memset(&work->path[0], 0, sizeof(work->path[1]));
3319         cm_path_set_rec_type(work->port->cm_dev->ib_device,
3320                              work->port->port_num, &work->path[0],
3321                              IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3322                                              lap_msg));
3323         param->alternate_path = &work->path[0];
3324         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3325         work->cm_event.private_data =
3326                 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3327
3328         spin_lock_irq(&cm_id_priv->lock);
3329         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3330                 goto unlock;
3331
3332         switch (cm_id_priv->id.lap_state) {
3333         case IB_CM_LAP_UNINIT:
3334         case IB_CM_LAP_IDLE:
3335                 break;
3336         case IB_CM_MRA_LAP_SENT:
3337                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3338                                 counter[CM_LAP_COUNTER]);
3339                 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3340                 if (IS_ERR(msg))
3341                         goto unlock;
3342
3343                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3344                               CM_MSG_RESPONSE_OTHER,
3345                               cm_id_priv->service_timeout,
3346                               cm_id_priv->private_data,
3347                               cm_id_priv->private_data_len);
3348                 spin_unlock_irq(&cm_id_priv->lock);
3349
3350                 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3351                     ib_post_send_mad(msg, NULL))
3352                         cm_free_msg(msg);
3353                 goto deref;
3354         case IB_CM_LAP_RCVD:
3355                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3356                                 counter[CM_LAP_COUNTER]);
3357                 goto unlock;
3358         default:
3359                 goto unlock;
3360         }
3361
3362         ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3363                                  work->mad_recv_wc->recv_buf.grh,
3364                                  &cm_id_priv->av);
3365         if (ret)
3366                 goto unlock;
3367
3368         ret = cm_init_av_by_path(param->alternate_path, NULL,
3369                                  &cm_id_priv->alt_av, cm_id_priv);
3370         if (ret)
3371                 goto unlock;
3372
3373         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3374         cm_id_priv->tid = lap_msg->hdr.tid;
3375         cm_queue_work_unlock(cm_id_priv, work);
3376         return 0;
3377
3378 unlock: spin_unlock_irq(&cm_id_priv->lock);
3379 deref:  cm_deref_id(cm_id_priv);
3380         return -EINVAL;
3381 }
3382
3383 static int cm_apr_handler(struct cm_work *work)
3384 {
3385         struct cm_id_private *cm_id_priv;
3386         struct cm_apr_msg *apr_msg;
3387
3388         /* Currently Alternate path messages are not supported for
3389          * RoCE link layer.
3390          */
3391         if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3392                                work->port->port_num))
3393                 return -EINVAL;
3394
3395         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3396         cm_id_priv = cm_acquire_id(
3397                 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3398                 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3399         if (!cm_id_priv)
3400                 return -EINVAL; /* Unmatched reply. */
3401
3402         work->cm_event.param.apr_rcvd.ap_status =
3403                 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3404         work->cm_event.param.apr_rcvd.apr_info =
3405                 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3406         work->cm_event.param.apr_rcvd.info_len =
3407                 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3408         work->cm_event.private_data =
3409                 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3410
3411         spin_lock_irq(&cm_id_priv->lock);
3412         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3413             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3414              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3415                 spin_unlock_irq(&cm_id_priv->lock);
3416                 goto out;
3417         }
3418         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3419         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3420         cm_id_priv->msg = NULL;
3421         cm_queue_work_unlock(cm_id_priv, work);
3422         return 0;
3423 out:
3424         cm_deref_id(cm_id_priv);
3425         return -EINVAL;
3426 }
3427
3428 static int cm_timewait_handler(struct cm_work *work)
3429 {
3430         struct cm_timewait_info *timewait_info;
3431         struct cm_id_private *cm_id_priv;
3432
3433         timewait_info = container_of(work, struct cm_timewait_info, work);
3434         spin_lock_irq(&cm.lock);
3435         list_del(&timewait_info->list);
3436         spin_unlock_irq(&cm.lock);
3437
3438         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3439                                    timewait_info->work.remote_id);
3440         if (!cm_id_priv)
3441                 return -EINVAL;
3442
3443         spin_lock_irq(&cm_id_priv->lock);
3444         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3445             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3446                 spin_unlock_irq(&cm_id_priv->lock);
3447                 goto out;
3448         }
3449         cm_id_priv->id.state = IB_CM_IDLE;
3450         cm_queue_work_unlock(cm_id_priv, work);
3451         return 0;
3452 out:
3453         cm_deref_id(cm_id_priv);
3454         return -EINVAL;
3455 }
3456
3457 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3458                                struct cm_id_private *cm_id_priv,
3459                                struct ib_cm_sidr_req_param *param)
3460 {
3461         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3462                           cm_form_tid(cm_id_priv));
3463         IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3464                 be32_to_cpu(cm_id_priv->id.local_id));
3465         IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3466                 be16_to_cpu(param->path->pkey));
3467         IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3468                 be64_to_cpu(param->service_id));
3469
3470         if (param->private_data && param->private_data_len)
3471                 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3472                             param->private_data, param->private_data_len);
3473 }
3474
3475 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3476                         struct ib_cm_sidr_req_param *param)
3477 {
3478         struct cm_id_private *cm_id_priv;
3479         struct ib_mad_send_buf *msg;
3480         unsigned long flags;
3481         int ret;
3482
3483         if (!param->path || (param->private_data &&
3484              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3485                 return -EINVAL;
3486
3487         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3488         ret = cm_init_av_by_path(param->path, param->sgid_attr,
3489                                  &cm_id_priv->av,
3490                                  cm_id_priv);
3491         if (ret)
3492                 goto out;
3493
3494         cm_id->service_id = param->service_id;
3495         cm_id->service_mask = ~cpu_to_be64(0);
3496         cm_id_priv->timeout_ms = param->timeout_ms;
3497         cm_id_priv->max_cm_retries = param->max_cm_retries;
3498         ret = cm_alloc_msg(cm_id_priv, &msg);
3499         if (ret)
3500                 goto out;
3501
3502         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3503                            param);
3504         msg->timeout_ms = cm_id_priv->timeout_ms;
3505         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3506
3507         spin_lock_irqsave(&cm_id_priv->lock, flags);
3508         if (cm_id->state == IB_CM_IDLE)
3509                 ret = ib_post_send_mad(msg, NULL);
3510         else
3511                 ret = -EINVAL;
3512
3513         if (ret) {
3514                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3515                 cm_free_msg(msg);
3516                 goto out;
3517         }
3518         cm_id->state = IB_CM_SIDR_REQ_SENT;
3519         cm_id_priv->msg = msg;
3520         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3521 out:
3522         return ret;
3523 }
3524 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3525
3526 static void cm_format_sidr_req_event(struct cm_work *work,
3527                                      const struct cm_id_private *rx_cm_id,
3528                                      struct ib_cm_id *listen_id)
3529 {
3530         struct cm_sidr_req_msg *sidr_req_msg;
3531         struct ib_cm_sidr_req_event_param *param;
3532
3533         sidr_req_msg = (struct cm_sidr_req_msg *)
3534                                 work->mad_recv_wc->recv_buf.mad;
3535         param = &work->cm_event.param.sidr_req_rcvd;
3536         param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3537         param->listen_id = listen_id;
3538         param->service_id =
3539                 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3540         param->bth_pkey = cm_get_bth_pkey(work);
3541         param->port = work->port->port_num;
3542         param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3543         work->cm_event.private_data =
3544                 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3545 }
3546
3547 static int cm_sidr_req_handler(struct cm_work *work)
3548 {
3549         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3550         struct cm_sidr_req_msg *sidr_req_msg;
3551         struct ib_wc *wc;
3552         int ret;
3553
3554         cm_id_priv =
3555                 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3556         if (IS_ERR(cm_id_priv))
3557                 return PTR_ERR(cm_id_priv);
3558
3559         /* Record SGID/SLID and request ID for lookup. */
3560         sidr_req_msg = (struct cm_sidr_req_msg *)
3561                                 work->mad_recv_wc->recv_buf.mad;
3562
3563         cm_id_priv->id.remote_id =
3564                 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3565         cm_id_priv->id.service_id =
3566                 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3567         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3568         cm_id_priv->tid = sidr_req_msg->hdr.tid;
3569
3570         wc = work->mad_recv_wc->wc;
3571         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3572         cm_id_priv->av.dgid.global.interface_id = 0;
3573         ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3574                                       work->mad_recv_wc->recv_buf.grh,
3575                                       &cm_id_priv->av);
3576         if (ret)
3577                 goto out;
3578
3579         spin_lock_irq(&cm.lock);
3580         listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3581         if (listen_cm_id_priv) {
3582                 spin_unlock_irq(&cm.lock);
3583                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3584                                 counter[CM_SIDR_REQ_COUNTER]);
3585                 goto out; /* Duplicate message. */
3586         }
3587         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3588         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3589                                            cm_id_priv->id.service_id);
3590         if (!listen_cm_id_priv) {
3591                 spin_unlock_irq(&cm.lock);
3592                 ib_send_cm_sidr_rep(&cm_id_priv->id,
3593                                     &(struct ib_cm_sidr_rep_param){
3594                                             .status = IB_SIDR_UNSUPPORTED });
3595                 goto out; /* No match. */
3596         }
3597         spin_unlock_irq(&cm.lock);
3598
3599         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3600         cm_id_priv->id.context = listen_cm_id_priv->id.context;
3601
3602         /*
3603          * A SIDR ID does not need to be in the xarray since it does not receive
3604          * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3605          * not enter timewait.
3606          */
3607
3608         cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3609         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3610         cm_free_work(work);
3611         /*
3612          * A pointer to the listen_cm_id is held in the event, so this deref
3613          * must be after the event is delivered above.
3614          */
3615         cm_deref_id(listen_cm_id_priv);
3616         if (ret)
3617                 cm_destroy_id(&cm_id_priv->id, ret);
3618         return 0;
3619 out:
3620         ib_destroy_cm_id(&cm_id_priv->id);
3621         return -EINVAL;
3622 }
3623
3624 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3625                                struct cm_id_private *cm_id_priv,
3626                                struct ib_cm_sidr_rep_param *param)
3627 {
3628         cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3629                               cm_id_priv->tid, param->ece.attr_mod);
3630         IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3631                 be32_to_cpu(cm_id_priv->id.remote_id));
3632         IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3633         IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3634         IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3635                 be64_to_cpu(cm_id_priv->id.service_id));
3636         IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3637         IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3638                 param->ece.vendor_id & 0xFF);
3639         IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3640                 (param->ece.vendor_id >> 8) & 0xFF);
3641
3642         if (param->info && param->info_length)
3643                 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3644                             param->info, param->info_length);
3645
3646         if (param->private_data && param->private_data_len)
3647                 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3648                             param->private_data, param->private_data_len);
3649 }
3650
3651 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3652                                    struct ib_cm_sidr_rep_param *param)
3653 {
3654         struct ib_mad_send_buf *msg;
3655         int ret;
3656
3657         lockdep_assert_held(&cm_id_priv->lock);
3658
3659         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3660             (param->private_data &&
3661              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3662                 return -EINVAL;
3663
3664         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3665                 return -EINVAL;
3666
3667         ret = cm_alloc_msg(cm_id_priv, &msg);
3668         if (ret)
3669                 return ret;
3670
3671         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3672                            param);
3673         ret = ib_post_send_mad(msg, NULL);
3674         if (ret) {
3675                 cm_free_msg(msg);
3676                 return ret;
3677         }
3678         cm_id_priv->id.state = IB_CM_IDLE;
3679         spin_lock_irq(&cm.lock);
3680         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3681                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3682                 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3683         }
3684         spin_unlock_irq(&cm.lock);
3685         return 0;
3686 }
3687
3688 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3689                         struct ib_cm_sidr_rep_param *param)
3690 {
3691         struct cm_id_private *cm_id_priv =
3692                 container_of(cm_id, struct cm_id_private, id);
3693         unsigned long flags;
3694         int ret;
3695
3696         spin_lock_irqsave(&cm_id_priv->lock, flags);
3697         ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3698         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3699         return ret;
3700 }
3701 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3702
3703 static void cm_format_sidr_rep_event(struct cm_work *work,
3704                                      const struct cm_id_private *cm_id_priv)
3705 {
3706         struct cm_sidr_rep_msg *sidr_rep_msg;
3707         struct ib_cm_sidr_rep_event_param *param;
3708
3709         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3710                                 work->mad_recv_wc->recv_buf.mad;
3711         param = &work->cm_event.param.sidr_rep_rcvd;
3712         param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3713         param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3714         param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3715         param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3716                                       sidr_rep_msg);
3717         param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3718                                   sidr_rep_msg);
3719         param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3720         work->cm_event.private_data =
3721                 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3722 }
3723
3724 static int cm_sidr_rep_handler(struct cm_work *work)
3725 {
3726         struct cm_sidr_rep_msg *sidr_rep_msg;
3727         struct cm_id_private *cm_id_priv;
3728
3729         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3730                                 work->mad_recv_wc->recv_buf.mad;
3731         cm_id_priv = cm_acquire_id(
3732                 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3733         if (!cm_id_priv)
3734                 return -EINVAL; /* Unmatched reply. */
3735
3736         spin_lock_irq(&cm_id_priv->lock);
3737         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3738                 spin_unlock_irq(&cm_id_priv->lock);
3739                 goto out;
3740         }
3741         cm_id_priv->id.state = IB_CM_IDLE;
3742         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3743         spin_unlock_irq(&cm_id_priv->lock);
3744
3745         cm_format_sidr_rep_event(work, cm_id_priv);
3746         cm_process_work(cm_id_priv, work);
3747         return 0;
3748 out:
3749         cm_deref_id(cm_id_priv);
3750         return -EINVAL;
3751 }
3752
3753 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3754                                   enum ib_wc_status wc_status)
3755 {
3756         struct cm_id_private *cm_id_priv;
3757         struct ib_cm_event cm_event;
3758         enum ib_cm_state state;
3759         int ret;
3760
3761         memset(&cm_event, 0, sizeof cm_event);
3762         cm_id_priv = msg->context[0];
3763
3764         /* Discard old sends or ones without a response. */
3765         spin_lock_irq(&cm_id_priv->lock);
3766         state = (enum ib_cm_state) (unsigned long) msg->context[1];
3767         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3768                 goto discard;
3769
3770         pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n",
3771                              state, ib_wc_status_msg(wc_status));
3772         switch (state) {
3773         case IB_CM_REQ_SENT:
3774         case IB_CM_MRA_REQ_RCVD:
3775                 cm_reset_to_idle(cm_id_priv);
3776                 cm_event.event = IB_CM_REQ_ERROR;
3777                 break;
3778         case IB_CM_REP_SENT:
3779         case IB_CM_MRA_REP_RCVD:
3780                 cm_reset_to_idle(cm_id_priv);
3781                 cm_event.event = IB_CM_REP_ERROR;
3782                 break;
3783         case IB_CM_DREQ_SENT:
3784                 cm_enter_timewait(cm_id_priv);
3785                 cm_event.event = IB_CM_DREQ_ERROR;
3786                 break;
3787         case IB_CM_SIDR_REQ_SENT:
3788                 cm_id_priv->id.state = IB_CM_IDLE;
3789                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3790                 break;
3791         default:
3792                 goto discard;
3793         }
3794         spin_unlock_irq(&cm_id_priv->lock);
3795         cm_event.param.send_status = wc_status;
3796
3797         /* No other events can occur on the cm_id at this point. */
3798         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3799         cm_free_msg(msg);
3800         if (ret)
3801                 ib_destroy_cm_id(&cm_id_priv->id);
3802         return;
3803 discard:
3804         spin_unlock_irq(&cm_id_priv->lock);
3805         cm_free_msg(msg);
3806 }
3807
3808 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3809                             struct ib_mad_send_wc *mad_send_wc)
3810 {
3811         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3812         struct cm_port *port;
3813         u16 attr_index;
3814
3815         port = mad_agent->context;
3816         attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3817                                   msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3818
3819         /*
3820          * If the send was in response to a received message (context[0] is not
3821          * set to a cm_id), and is not a REJ, then it is a send that was
3822          * manually retried.
3823          */
3824         if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3825                 msg->retries = 1;
3826
3827         atomic_long_add(1 + msg->retries,
3828                         &port->counter_group[CM_XMIT].counter[attr_index]);
3829         if (msg->retries)
3830                 atomic_long_add(msg->retries,
3831                                 &port->counter_group[CM_XMIT_RETRIES].
3832                                 counter[attr_index]);
3833
3834         switch (mad_send_wc->status) {
3835         case IB_WC_SUCCESS:
3836         case IB_WC_WR_FLUSH_ERR:
3837                 cm_free_msg(msg);
3838                 break;
3839         default:
3840                 if (msg->context[0] && msg->context[1])
3841                         cm_process_send_error(msg, mad_send_wc->status);
3842                 else
3843                         cm_free_msg(msg);
3844                 break;
3845         }
3846 }
3847
3848 static void cm_work_handler(struct work_struct *_work)
3849 {
3850         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3851         int ret;
3852
3853         switch (work->cm_event.event) {
3854         case IB_CM_REQ_RECEIVED:
3855                 ret = cm_req_handler(work);
3856                 break;
3857         case IB_CM_MRA_RECEIVED:
3858                 ret = cm_mra_handler(work);
3859                 break;
3860         case IB_CM_REJ_RECEIVED:
3861                 ret = cm_rej_handler(work);
3862                 break;
3863         case IB_CM_REP_RECEIVED:
3864                 ret = cm_rep_handler(work);
3865                 break;
3866         case IB_CM_RTU_RECEIVED:
3867                 ret = cm_rtu_handler(work);
3868                 break;
3869         case IB_CM_USER_ESTABLISHED:
3870                 ret = cm_establish_handler(work);
3871                 break;
3872         case IB_CM_DREQ_RECEIVED:
3873                 ret = cm_dreq_handler(work);
3874                 break;
3875         case IB_CM_DREP_RECEIVED:
3876                 ret = cm_drep_handler(work);
3877                 break;
3878         case IB_CM_SIDR_REQ_RECEIVED:
3879                 ret = cm_sidr_req_handler(work);
3880                 break;
3881         case IB_CM_SIDR_REP_RECEIVED:
3882                 ret = cm_sidr_rep_handler(work);
3883                 break;
3884         case IB_CM_LAP_RECEIVED:
3885                 ret = cm_lap_handler(work);
3886                 break;
3887         case IB_CM_APR_RECEIVED:
3888                 ret = cm_apr_handler(work);
3889                 break;
3890         case IB_CM_TIMEWAIT_EXIT:
3891                 ret = cm_timewait_handler(work);
3892                 break;
3893         default:
3894                 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event);
3895                 ret = -EINVAL;
3896                 break;
3897         }
3898         if (ret)
3899                 cm_free_work(work);
3900 }
3901
3902 static int cm_establish(struct ib_cm_id *cm_id)
3903 {
3904         struct cm_id_private *cm_id_priv;
3905         struct cm_work *work;
3906         unsigned long flags;
3907         int ret = 0;
3908         struct cm_device *cm_dev;
3909
3910         cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3911         if (!cm_dev)
3912                 return -ENODEV;
3913
3914         work = kmalloc(sizeof *work, GFP_ATOMIC);
3915         if (!work)
3916                 return -ENOMEM;
3917
3918         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3919         spin_lock_irqsave(&cm_id_priv->lock, flags);
3920         switch (cm_id->state)
3921         {
3922         case IB_CM_REP_SENT:
3923         case IB_CM_MRA_REP_RCVD:
3924                 cm_id->state = IB_CM_ESTABLISHED;
3925                 break;
3926         case IB_CM_ESTABLISHED:
3927                 ret = -EISCONN;
3928                 break;
3929         default:
3930                 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
3931                          be32_to_cpu(cm_id->local_id), cm_id->state);
3932                 ret = -EINVAL;
3933                 break;
3934         }
3935         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3936
3937         if (ret) {
3938                 kfree(work);
3939                 goto out;
3940         }
3941
3942         /*
3943          * The CM worker thread may try to destroy the cm_id before it
3944          * can execute this work item.  To prevent potential deadlock,
3945          * we need to find the cm_id once we're in the context of the
3946          * worker thread, rather than holding a reference on it.
3947          */
3948         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3949         work->local_id = cm_id->local_id;
3950         work->remote_id = cm_id->remote_id;
3951         work->mad_recv_wc = NULL;
3952         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3953
3954         /* Check if the device started its remove_one */
3955         spin_lock_irqsave(&cm.lock, flags);
3956         if (!cm_dev->going_down) {
3957                 queue_delayed_work(cm.wq, &work->work, 0);
3958         } else {
3959                 kfree(work);
3960                 ret = -ENODEV;
3961         }
3962         spin_unlock_irqrestore(&cm.lock, flags);
3963
3964 out:
3965         return ret;
3966 }
3967
3968 static int cm_migrate(struct ib_cm_id *cm_id)
3969 {
3970         struct cm_id_private *cm_id_priv;
3971         struct cm_av tmp_av;
3972         unsigned long flags;
3973         int tmp_send_port_not_ready;
3974         int ret = 0;
3975
3976         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3977         spin_lock_irqsave(&cm_id_priv->lock, flags);
3978         if (cm_id->state == IB_CM_ESTABLISHED &&
3979             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3980              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3981                 cm_id->lap_state = IB_CM_LAP_IDLE;
3982                 /* Swap address vector */
3983                 tmp_av = cm_id_priv->av;
3984                 cm_id_priv->av = cm_id_priv->alt_av;
3985                 cm_id_priv->alt_av = tmp_av;
3986                 /* Swap port send ready state */
3987                 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3988                 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3989                 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3990         } else
3991                 ret = -EINVAL;
3992         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3993
3994         return ret;
3995 }
3996
3997 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3998 {
3999         int ret;
4000
4001         switch (event) {
4002         case IB_EVENT_COMM_EST:
4003                 ret = cm_establish(cm_id);
4004                 break;
4005         case IB_EVENT_PATH_MIG:
4006                 ret = cm_migrate(cm_id);
4007                 break;
4008         default:
4009                 ret = -EINVAL;
4010         }
4011         return ret;
4012 }
4013 EXPORT_SYMBOL(ib_cm_notify);
4014
4015 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
4016                             struct ib_mad_send_buf *send_buf,
4017                             struct ib_mad_recv_wc *mad_recv_wc)
4018 {
4019         struct cm_port *port = mad_agent->context;
4020         struct cm_work *work;
4021         enum ib_cm_event_type event;
4022         bool alt_path = false;
4023         u16 attr_id;
4024         int paths = 0;
4025         int going_down = 0;
4026
4027         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4028         case CM_REQ_ATTR_ID:
4029                 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4030                                                 mad_recv_wc->recv_buf.mad);
4031                 paths = 1 + (alt_path != 0);
4032                 event = IB_CM_REQ_RECEIVED;
4033                 break;
4034         case CM_MRA_ATTR_ID:
4035                 event = IB_CM_MRA_RECEIVED;
4036                 break;
4037         case CM_REJ_ATTR_ID:
4038                 event = IB_CM_REJ_RECEIVED;
4039                 break;
4040         case CM_REP_ATTR_ID:
4041                 event = IB_CM_REP_RECEIVED;
4042                 break;
4043         case CM_RTU_ATTR_ID:
4044                 event = IB_CM_RTU_RECEIVED;
4045                 break;
4046         case CM_DREQ_ATTR_ID:
4047                 event = IB_CM_DREQ_RECEIVED;
4048                 break;
4049         case CM_DREP_ATTR_ID:
4050                 event = IB_CM_DREP_RECEIVED;
4051                 break;
4052         case CM_SIDR_REQ_ATTR_ID:
4053                 event = IB_CM_SIDR_REQ_RECEIVED;
4054                 break;
4055         case CM_SIDR_REP_ATTR_ID:
4056                 event = IB_CM_SIDR_REP_RECEIVED;
4057                 break;
4058         case CM_LAP_ATTR_ID:
4059                 paths = 1;
4060                 event = IB_CM_LAP_RECEIVED;
4061                 break;
4062         case CM_APR_ATTR_ID:
4063                 event = IB_CM_APR_RECEIVED;
4064                 break;
4065         default:
4066                 ib_free_recv_mad(mad_recv_wc);
4067                 return;
4068         }
4069
4070         attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4071         atomic_long_inc(&port->counter_group[CM_RECV].
4072                         counter[attr_id - CM_ATTR_ID_OFFSET]);
4073
4074         work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4075         if (!work) {
4076                 ib_free_recv_mad(mad_recv_wc);
4077                 return;
4078         }
4079
4080         INIT_DELAYED_WORK(&work->work, cm_work_handler);
4081         work->cm_event.event = event;
4082         work->mad_recv_wc = mad_recv_wc;
4083         work->port = port;
4084
4085         /* Check if the device started its remove_one */
4086         spin_lock_irq(&cm.lock);
4087         if (!port->cm_dev->going_down)
4088                 queue_delayed_work(cm.wq, &work->work, 0);
4089         else
4090                 going_down = 1;
4091         spin_unlock_irq(&cm.lock);
4092
4093         if (going_down) {
4094                 kfree(work);
4095                 ib_free_recv_mad(mad_recv_wc);
4096         }
4097 }
4098
4099 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4100                                 struct ib_qp_attr *qp_attr,
4101                                 int *qp_attr_mask)
4102 {
4103         unsigned long flags;
4104         int ret;
4105
4106         spin_lock_irqsave(&cm_id_priv->lock, flags);
4107         switch (cm_id_priv->id.state) {
4108         case IB_CM_REQ_SENT:
4109         case IB_CM_MRA_REQ_RCVD:
4110         case IB_CM_REQ_RCVD:
4111         case IB_CM_MRA_REQ_SENT:
4112         case IB_CM_REP_RCVD:
4113         case IB_CM_MRA_REP_SENT:
4114         case IB_CM_REP_SENT:
4115         case IB_CM_MRA_REP_RCVD:
4116         case IB_CM_ESTABLISHED:
4117                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4118                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
4119                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4120                 if (cm_id_priv->responder_resources)
4121                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4122                                                     IB_ACCESS_REMOTE_ATOMIC;
4123                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4124                 qp_attr->port_num = cm_id_priv->av.port->port_num;
4125                 ret = 0;
4126                 break;
4127         default:
4128                 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4129                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
4130                          cm_id_priv->id.state);
4131                 ret = -EINVAL;
4132                 break;
4133         }
4134         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4135         return ret;
4136 }
4137
4138 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4139                                struct ib_qp_attr *qp_attr,
4140                                int *qp_attr_mask)
4141 {
4142         unsigned long flags;
4143         int ret;
4144
4145         spin_lock_irqsave(&cm_id_priv->lock, flags);
4146         switch (cm_id_priv->id.state) {
4147         case IB_CM_REQ_RCVD:
4148         case IB_CM_MRA_REQ_SENT:
4149         case IB_CM_REP_RCVD:
4150         case IB_CM_MRA_REP_SENT:
4151         case IB_CM_REP_SENT:
4152         case IB_CM_MRA_REP_RCVD:
4153         case IB_CM_ESTABLISHED:
4154                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4155                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4156                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4157                 qp_attr->path_mtu = cm_id_priv->path_mtu;
4158                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4159                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4160                 if (cm_id_priv->qp_type == IB_QPT_RC ||
4161                     cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4162                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4163                                          IB_QP_MIN_RNR_TIMER;
4164                         qp_attr->max_dest_rd_atomic =
4165                                         cm_id_priv->responder_resources;
4166                         qp_attr->min_rnr_timer = 0;
4167                 }
4168                 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4169                         *qp_attr_mask |= IB_QP_ALT_PATH;
4170                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4171                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4172                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4173                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4174                 }
4175                 ret = 0;
4176                 break;
4177         default:
4178                 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4179                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
4180                          cm_id_priv->id.state);
4181                 ret = -EINVAL;
4182                 break;
4183         }
4184         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4185         return ret;
4186 }
4187
4188 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4189                                struct ib_qp_attr *qp_attr,
4190                                int *qp_attr_mask)
4191 {
4192         unsigned long flags;
4193         int ret;
4194
4195         spin_lock_irqsave(&cm_id_priv->lock, flags);
4196         switch (cm_id_priv->id.state) {
4197         /* Allow transition to RTS before sending REP */
4198         case IB_CM_REQ_RCVD:
4199         case IB_CM_MRA_REQ_SENT:
4200
4201         case IB_CM_REP_RCVD:
4202         case IB_CM_MRA_REP_SENT:
4203         case IB_CM_REP_SENT:
4204         case IB_CM_MRA_REP_RCVD:
4205         case IB_CM_ESTABLISHED:
4206                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4207                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4208                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4209                         switch (cm_id_priv->qp_type) {
4210                         case IB_QPT_RC:
4211                         case IB_QPT_XRC_INI:
4212                                 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4213                                                  IB_QP_MAX_QP_RD_ATOMIC;
4214                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
4215                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4216                                 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4217                                 fallthrough;
4218                         case IB_QPT_XRC_TGT:
4219                                 *qp_attr_mask |= IB_QP_TIMEOUT;
4220                                 qp_attr->timeout = cm_id_priv->av.timeout;
4221                                 break;
4222                         default:
4223                                 break;
4224                         }
4225                         if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4226                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4227                                 qp_attr->path_mig_state = IB_MIG_REARM;
4228                         }
4229                 } else {
4230                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4231                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4232                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4233                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4234                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4235                         qp_attr->path_mig_state = IB_MIG_REARM;
4236                 }
4237                 ret = 0;
4238                 break;
4239         default:
4240                 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4241                          __func__, be32_to_cpu(cm_id_priv->id.local_id),
4242                          cm_id_priv->id.state);
4243                 ret = -EINVAL;
4244                 break;
4245         }
4246         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4247         return ret;
4248 }
4249
4250 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4251                        struct ib_qp_attr *qp_attr,
4252                        int *qp_attr_mask)
4253 {
4254         struct cm_id_private *cm_id_priv;
4255         int ret;
4256
4257         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4258         switch (qp_attr->qp_state) {
4259         case IB_QPS_INIT:
4260                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4261                 break;
4262         case IB_QPS_RTR:
4263                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4264                 break;
4265         case IB_QPS_RTS:
4266                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4267                 break;
4268         default:
4269                 ret = -EINVAL;
4270                 break;
4271         }
4272         return ret;
4273 }
4274 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4275
4276 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4277                                char *buf)
4278 {
4279         struct cm_counter_group *group;
4280         struct cm_counter_attribute *cm_attr;
4281
4282         group = container_of(obj, struct cm_counter_group, obj);
4283         cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4284
4285         return sprintf(buf, "%ld\n",
4286                        atomic_long_read(&group->counter[cm_attr->index]));
4287 }
4288
4289 static const struct sysfs_ops cm_counter_ops = {
4290         .show = cm_show_counter
4291 };
4292
4293 static struct kobj_type cm_counter_obj_type = {
4294         .sysfs_ops = &cm_counter_ops,
4295         .default_attrs = cm_counter_default_attrs
4296 };
4297
4298 static char *cm_devnode(struct device *dev, umode_t *mode)
4299 {
4300         if (mode)
4301                 *mode = 0666;
4302         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
4303 }
4304
4305 struct class cm_class = {
4306         .owner   = THIS_MODULE,
4307         .name    = "infiniband_cm",
4308         .devnode = cm_devnode,
4309 };
4310 EXPORT_SYMBOL(cm_class);
4311
4312 static int cm_create_port_fs(struct cm_port *port)
4313 {
4314         int i, ret;
4315
4316         for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4317                 ret = ib_port_register_module_stat(port->cm_dev->ib_device,
4318                                                    port->port_num,
4319                                                    &port->counter_group[i].obj,
4320                                                    &cm_counter_obj_type,
4321                                                    counter_group_names[i]);
4322                 if (ret)
4323                         goto error;
4324         }
4325
4326         return 0;
4327
4328 error:
4329         while (i--)
4330                 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4331         return ret;
4332
4333 }
4334
4335 static void cm_remove_port_fs(struct cm_port *port)
4336 {
4337         int i;
4338
4339         for (i = 0; i < CM_COUNTER_GROUPS; i++)
4340                 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4341
4342 }
4343
4344 static int cm_add_one(struct ib_device *ib_device)
4345 {
4346         struct cm_device *cm_dev;
4347         struct cm_port *port;
4348         struct ib_mad_reg_req reg_req = {
4349                 .mgmt_class = IB_MGMT_CLASS_CM,
4350                 .mgmt_class_version = IB_CM_CLASS_VERSION,
4351         };
4352         struct ib_port_modify port_modify = {
4353                 .set_port_cap_mask = IB_PORT_CM_SUP
4354         };
4355         unsigned long flags;
4356         int ret;
4357         int count = 0;
4358         u8 i;
4359
4360         cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4361                          GFP_KERNEL);
4362         if (!cm_dev)
4363                 return -ENOMEM;
4364
4365         cm_dev->ib_device = ib_device;
4366         cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4367         cm_dev->going_down = 0;
4368
4369         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4370         for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4371                 if (!rdma_cap_ib_cm(ib_device, i))
4372                         continue;
4373
4374                 port = kzalloc(sizeof *port, GFP_KERNEL);
4375                 if (!port) {
4376                         ret = -ENOMEM;
4377                         goto error1;
4378                 }
4379
4380                 cm_dev->port[i-1] = port;
4381                 port->cm_dev = cm_dev;
4382                 port->port_num = i;
4383
4384                 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4385                 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4386
4387                 ret = cm_create_port_fs(port);
4388                 if (ret)
4389                         goto error1;
4390
4391                 port->mad_agent = ib_register_mad_agent(ib_device, i,
4392                                                         IB_QPT_GSI,
4393                                                         &reg_req,
4394                                                         0,
4395                                                         cm_send_handler,
4396                                                         cm_recv_handler,
4397                                                         port,
4398                                                         0);
4399                 if (IS_ERR(port->mad_agent)) {
4400                         ret = PTR_ERR(port->mad_agent);
4401                         goto error2;
4402                 }
4403
4404                 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4405                 if (ret)
4406                         goto error3;
4407
4408                 count++;
4409         }
4410
4411         if (!count) {
4412                 ret = -EOPNOTSUPP;
4413                 goto free;
4414         }
4415
4416         ib_set_client_data(ib_device, &cm_client, cm_dev);
4417
4418         write_lock_irqsave(&cm.device_lock, flags);
4419         list_add_tail(&cm_dev->list, &cm.device_list);
4420         write_unlock_irqrestore(&cm.device_lock, flags);
4421         return 0;
4422
4423 error3:
4424         ib_unregister_mad_agent(port->mad_agent);
4425 error2:
4426         cm_remove_port_fs(port);
4427 error1:
4428         port_modify.set_port_cap_mask = 0;
4429         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4430         kfree(port);
4431         while (--i) {
4432                 if (!rdma_cap_ib_cm(ib_device, i))
4433                         continue;
4434
4435                 port = cm_dev->port[i-1];
4436                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4437                 ib_unregister_mad_agent(port->mad_agent);
4438                 cm_remove_port_fs(port);
4439                 kfree(port);
4440         }
4441 free:
4442         kfree(cm_dev);
4443         return ret;
4444 }
4445
4446 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4447 {
4448         struct cm_device *cm_dev = client_data;
4449         struct cm_port *port;
4450         struct cm_id_private *cm_id_priv;
4451         struct ib_mad_agent *cur_mad_agent;
4452         struct ib_port_modify port_modify = {
4453                 .clr_port_cap_mask = IB_PORT_CM_SUP
4454         };
4455         unsigned long flags;
4456         int i;
4457
4458         write_lock_irqsave(&cm.device_lock, flags);
4459         list_del(&cm_dev->list);
4460         write_unlock_irqrestore(&cm.device_lock, flags);
4461
4462         spin_lock_irq(&cm.lock);
4463         cm_dev->going_down = 1;
4464         spin_unlock_irq(&cm.lock);
4465
4466         for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4467                 if (!rdma_cap_ib_cm(ib_device, i))
4468                         continue;
4469
4470                 port = cm_dev->port[i-1];
4471                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4472                 /* Mark all the cm_id's as not valid */
4473                 spin_lock_irq(&cm.lock);
4474                 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4475                         cm_id_priv->altr_send_port_not_ready = 1;
4476                 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4477                         cm_id_priv->prim_send_port_not_ready = 1;
4478                 spin_unlock_irq(&cm.lock);
4479                 /*
4480                  * We flush the queue here after the going_down set, this
4481                  * verify that no new works will be queued in the recv handler,
4482                  * after that we can call the unregister_mad_agent
4483                  */
4484                 flush_workqueue(cm.wq);
4485                 spin_lock_irq(&cm.state_lock);
4486                 cur_mad_agent = port->mad_agent;
4487                 port->mad_agent = NULL;
4488                 spin_unlock_irq(&cm.state_lock);
4489                 ib_unregister_mad_agent(cur_mad_agent);
4490                 cm_remove_port_fs(port);
4491                 kfree(port);
4492         }
4493
4494         kfree(cm_dev);
4495 }
4496
4497 static int __init ib_cm_init(void)
4498 {
4499         int ret;
4500
4501         INIT_LIST_HEAD(&cm.device_list);
4502         rwlock_init(&cm.device_lock);
4503         spin_lock_init(&cm.lock);
4504         spin_lock_init(&cm.state_lock);
4505         cm.listen_service_table = RB_ROOT;
4506         cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4507         cm.remote_id_table = RB_ROOT;
4508         cm.remote_qp_table = RB_ROOT;
4509         cm.remote_sidr_table = RB_ROOT;
4510         xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
4511         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4512         INIT_LIST_HEAD(&cm.timewait_list);
4513
4514         ret = class_register(&cm_class);
4515         if (ret) {
4516                 ret = -ENOMEM;
4517                 goto error1;
4518         }
4519
4520         cm.wq = alloc_workqueue("ib_cm", 0, 1);
4521         if (!cm.wq) {
4522                 ret = -ENOMEM;
4523                 goto error2;
4524         }
4525
4526         ret = ib_register_client(&cm_client);
4527         if (ret)
4528                 goto error3;
4529
4530         return 0;
4531 error3:
4532         destroy_workqueue(cm.wq);
4533 error2:
4534         class_unregister(&cm_class);
4535 error1:
4536         return ret;
4537 }
4538
4539 static void __exit ib_cm_cleanup(void)
4540 {
4541         struct cm_timewait_info *timewait_info, *tmp;
4542
4543         spin_lock_irq(&cm.lock);
4544         list_for_each_entry(timewait_info, &cm.timewait_list, list)
4545                 cancel_delayed_work(&timewait_info->work.work);
4546         spin_unlock_irq(&cm.lock);
4547
4548         ib_unregister_client(&cm_client);
4549         destroy_workqueue(cm.wq);
4550
4551         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4552                 list_del(&timewait_info->list);
4553                 kfree(timewait_info);
4554         }
4555
4556         class_unregister(&cm_class);
4557         WARN_ON(!xa_empty(&cm.local_id_table));
4558 }
4559
4560 module_init(ib_cm_init);
4561 module_exit(ib_cm_cleanup);