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 #include "cm_trace.h"
  31
  32 MODULE_AUTHOR("Sean Hefty");
  33 MODULE_DESCRIPTION("InfiniBand CM");
  34 MODULE_LICENSE("Dual BSD/GPL");
  35
  36 static const char * const ibcm_rej_reason_strs[] = {
  37         [IB_CM_REJ_NO_QP]                       = "no QP",
  38         [IB_CM_REJ_NO_EEC]                      = "no EEC",
  39         [IB_CM_REJ_NO_RESOURCES]                = "no resources",
  40         [IB_CM_REJ_TIMEOUT]                     = "timeout",
  41         [IB_CM_REJ_UNSUPPORTED]                 = "unsupported",
  42         [IB_CM_REJ_INVALID_COMM_ID]             = "invalid comm ID",
  43         [IB_CM_REJ_INVALID_COMM_INSTANCE]       = "invalid comm instance",
  44         [IB_CM_REJ_INVALID_SERVICE_ID]          = "invalid service ID",
  45         [IB_CM_REJ_INVALID_TRANSPORT_TYPE]      = "invalid transport type",
  46         [IB_CM_REJ_STALE_CONN]                  = "stale conn",
  47         [IB_CM_REJ_RDC_NOT_EXIST]               = "RDC not exist",
  48         [IB_CM_REJ_INVALID_GID]                 = "invalid GID",
  49         [IB_CM_REJ_INVALID_LID]                 = "invalid LID",
  50         [IB_CM_REJ_INVALID_SL]                  = "invalid SL",
  51         [IB_CM_REJ_INVALID_TRAFFIC_CLASS]       = "invalid traffic class",
  52         [IB_CM_REJ_INVALID_HOP_LIMIT]           = "invalid hop limit",
  53         [IB_CM_REJ_INVALID_PACKET_RATE]         = "invalid packet rate",
  54         [IB_CM_REJ_INVALID_ALT_GID]             = "invalid alt GID",
  55         [IB_CM_REJ_INVALID_ALT_LID]             = "invalid alt LID",
  56         [IB_CM_REJ_INVALID_ALT_SL]              = "invalid alt SL",
  57         [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS]   = "invalid alt traffic class",
  58         [IB_CM_REJ_INVALID_ALT_HOP_LIMIT]       = "invalid alt hop limit",
  59         [IB_CM_REJ_INVALID_ALT_PACKET_RATE]     = "invalid alt packet rate",
  60         [IB_CM_REJ_PORT_CM_REDIRECT]            = "port CM redirect",
  61         [IB_CM_REJ_PORT_REDIRECT]               = "port redirect",
  62         [IB_CM_REJ_INVALID_MTU]                 = "invalid MTU",
  63         [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
  64         [IB_CM_REJ_CONSUMER_DEFINED]            = "consumer defined",
  65         [IB_CM_REJ_INVALID_RNR_RETRY]           = "invalid RNR retry",
  66         [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID]     = "duplicate local comm ID",
  67         [IB_CM_REJ_INVALID_CLASS_VERSION]       = "invalid class version",
  68         [IB_CM_REJ_INVALID_FLOW_LABEL]          = "invalid flow label",
  69         [IB_CM_REJ_INVALID_ALT_FLOW_LABEL]      = "invalid alt flow label",
  70         [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
  71                 "vendor option is not supported",
  72 };
  73
  74 const char *__attribute_const__ ibcm_reject_msg(int reason)
  75 {
  76         size_t index = reason;
  77
  78         if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
  79             ibcm_rej_reason_strs[index])
  80                 return ibcm_rej_reason_strs[index];
  81         else
  82                 return "unrecognized reason";
  83 }
  84 EXPORT_SYMBOL(ibcm_reject_msg);
  85
  86 struct cm_id_private;
  87 struct cm_work;
  88 static int cm_add_one(struct ib_device *device);
  89 static void cm_remove_one(struct ib_device *device, void *client_data);
  90 static void cm_process_work(struct cm_id_private *cm_id_priv,
  91                             struct cm_work *work);
  92 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
  93                                    struct ib_cm_sidr_rep_param *param);
  94 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
  95                                const void *private_data, u8 private_data_len);
  96 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
  97                                void *private_data, u8 private_data_len);
  98 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
  99                               enum ib_cm_rej_reason reason, void *ari,
 100                               u8 ari_length, const void *private_data,
 101                               u8 private_data_len);
 102
 103 static struct ib_client cm_client = {
 104         .name   = "cm",
 105         .add    = cm_add_one,
 106         .remove = cm_remove_one
 107 };
 108
 109 static struct ib_cm {
 110         spinlock_t lock;
 111         struct list_head device_list;
 112         rwlock_t device_lock;
 113         struct rb_root listen_service_table;
 114         u64 listen_service_id;
 115         /* struct rb_root peer_service_table; todo: fix peer to peer */
 116         struct rb_root remote_qp_table;
 117         struct rb_root remote_id_table;
 118         struct rb_root remote_sidr_table;
 119         struct xarray local_id_table;
 120         u32 local_id_next;
 121         __be32 random_id_operand;
 122         struct list_head timewait_list;
 123         struct workqueue_struct *wq;
 124         /* Sync on cm change port state */
 125         spinlock_t state_lock;
 126 } cm;
 127
 128 /* Counter indexes ordered by attribute ID */
 129 enum {
 130         CM_REQ_COUNTER,
 131         CM_MRA_COUNTER,
 132         CM_REJ_COUNTER,
 133         CM_REP_COUNTER,
 134         CM_RTU_COUNTER,
 135         CM_DREQ_COUNTER,
 136         CM_DREP_COUNTER,
 137         CM_SIDR_REQ_COUNTER,
 138         CM_SIDR_REP_COUNTER,
 139         CM_LAP_COUNTER,
 140         CM_APR_COUNTER,
 141         CM_ATTR_COUNT,
 142         CM_ATTR_ID_OFFSET = 0x0010,
 143 };
 144
 145 enum {
 146         CM_XMIT,
 147         CM_XMIT_RETRIES,
 148         CM_RECV,
 149         CM_RECV_DUPLICATES,
 150         CM_COUNTER_GROUPS
 151 };
 152
 153 static char const counter_group_names[CM_COUNTER_GROUPS]
 154                                      [sizeof("cm_rx_duplicates")] = {
 155         "cm_tx_msgs", "cm_tx_retries",
 156         "cm_rx_msgs", "cm_rx_duplicates"
 157 };
 158
 159 struct cm_counter_group {
 160         struct kobject obj;
 161         atomic_long_t counter[CM_ATTR_COUNT];
 162 };
 163
 164 struct cm_counter_attribute {
 165         struct attribute attr;
 166         int index;
 167 };
 168
 169 #define CM_COUNTER_ATTR(_name, _index) \
 170 struct cm_counter_attribute cm_##_name##_counter_attr = { \
 171         .attr = { .name = __stringify(_name), .mode = 0444 }, \
 172         .index = _index \
 173 }
 174
 175 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
 176 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
 177 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
 178 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
 179 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
 180 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
 181 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
 182 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
 183 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
 184 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
 185 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
 186
 187 static struct attribute *cm_counter_default_attrs[] = {
 188         &cm_req_counter_attr.attr,
 189         &cm_mra_counter_attr.attr,
 190         &cm_rej_counter_attr.attr,
 191         &cm_rep_counter_attr.attr,
 192         &cm_rtu_counter_attr.attr,
 193         &cm_dreq_counter_attr.attr,
 194         &cm_drep_counter_attr.attr,
 195         &cm_sidr_req_counter_attr.attr,
 196         &cm_sidr_rep_counter_attr.attr,
 197         &cm_lap_counter_attr.attr,
 198         &cm_apr_counter_attr.attr,
 199         NULL
 200 };
 201
 202 struct cm_port {
 203         struct cm_device *cm_dev;
 204         struct ib_mad_agent *mad_agent;
 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(&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(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
 882                  cm_id_priv, GFP_ATOMIC);
 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(&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                 ib_destroy_cm_id(&cm_id_priv->id);
1285                 return ERR_PTR(err);
1286         }
1287
1288         spin_lock_irq(&cm_id_priv->lock);
1289         listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1290         if (listen_id_priv != cm_id_priv) {
1291                 spin_unlock_irq(&cm_id_priv->lock);
1292                 ib_destroy_cm_id(&cm_id_priv->id);
1293                 if (!listen_id_priv)
1294                         return ERR_PTR(-EINVAL);
1295                 return &listen_id_priv->id;
1296         }
1297         cm_id_priv->id.state = IB_CM_LISTEN;
1298         spin_unlock_irq(&cm_id_priv->lock);
1299
1300         /*
1301          * A listen ID does not need to be in the xarray since it does not
1302          * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1303          * and does not enter timewait.
1304          */
1305
1306         return &cm_id_priv->id;
1307 }
1308 EXPORT_SYMBOL(ib_cm_insert_listen);
1309
1310 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1311 {
1312         u64 hi_tid, low_tid;
1313
1314         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1315         low_tid  = (u64)cm_id_priv->id.local_id;
1316         return cpu_to_be64(hi_tid | low_tid);
1317 }
1318
1319 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1320                               __be16 attr_id, __be64 tid)
1321 {
1322         hdr->base_version  = IB_MGMT_BASE_VERSION;
1323         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
1324         hdr->class_version = IB_CM_CLASS_VERSION;
1325         hdr->method        = IB_MGMT_METHOD_SEND;
1326         hdr->attr_id       = attr_id;
1327         hdr->tid           = tid;
1328 }
1329
1330 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1331                                   __be64 tid, u32 attr_mod)
1332 {
1333         cm_format_mad_hdr(hdr, attr_id, tid);
1334         hdr->attr_mod = cpu_to_be32(attr_mod);
1335 }
1336
1337 static void cm_format_req(struct cm_req_msg *req_msg,
1338                           struct cm_id_private *cm_id_priv,
1339                           struct ib_cm_req_param *param)
1340 {
1341         struct sa_path_rec *pri_path = param->primary_path;
1342         struct sa_path_rec *alt_path = param->alternate_path;
1343         bool pri_ext = false;
1344
1345         if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1346                 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1347                                               pri_path->opa.slid);
1348
1349         cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1350                               cm_form_tid(cm_id_priv), param->ece.attr_mod);
1351
1352         IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1353                 be32_to_cpu(cm_id_priv->id.local_id));
1354         IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1355         IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1356                 be64_to_cpu(cm_id_priv->id.device->node_guid));
1357         IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1358         IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1359         IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1360                 param->remote_cm_response_timeout);
1361         cm_req_set_qp_type(req_msg, param->qp_type);
1362         IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1363         IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1364         IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1365                 param->local_cm_response_timeout);
1366         IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1367                 be16_to_cpu(param->primary_path->pkey));
1368         IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1369                 param->primary_path->mtu);
1370         IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1371
1372         if (param->qp_type != IB_QPT_XRC_INI) {
1373                 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1374                         param->responder_resources);
1375                 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1376                 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1377                         param->rnr_retry_count);
1378                 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1379         }
1380
1381         *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1382                 pri_path->sgid;
1383         *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1384                 pri_path->dgid;
1385         if (pri_ext) {
1386                 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1387                         ->global.interface_id =
1388                         OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1389                 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1390                         ->global.interface_id =
1391                         OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1392         }
1393         if (pri_path->hop_limit <= 1) {
1394                 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1395                         be16_to_cpu(pri_ext ? 0 :
1396                                               htons(ntohl(sa_path_get_slid(
1397                                                       pri_path)))));
1398                 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1399                         be16_to_cpu(pri_ext ? 0 :
1400                                               htons(ntohl(sa_path_get_dlid(
1401                                                       pri_path)))));
1402         } else {
1403                 /* Work-around until there's a way to obtain remote LID info */
1404                 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1405                         be16_to_cpu(IB_LID_PERMISSIVE));
1406                 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1407                         be16_to_cpu(IB_LID_PERMISSIVE));
1408         }
1409         IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1410                 be32_to_cpu(pri_path->flow_label));
1411         IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1412         IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1413         IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1414         IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1415         IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1416                 (pri_path->hop_limit <= 1));
1417         IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1418                 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1419                                pri_path->packet_life_time));
1420
1421         if (alt_path) {
1422                 bool alt_ext = false;
1423
1424                 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1425                         alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1426                                                       alt_path->opa.slid);
1427
1428                 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1429                         alt_path->sgid;
1430                 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1431                         alt_path->dgid;
1432                 if (alt_ext) {
1433                         IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1434                                         req_msg)
1435                                 ->global.interface_id =
1436                                 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1437                         IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1438                                         req_msg)
1439                                 ->global.interface_id =
1440                                 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1441                 }
1442                 if (alt_path->hop_limit <= 1) {
1443                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1444                                 be16_to_cpu(
1445                                         alt_ext ? 0 :
1446                                                   htons(ntohl(sa_path_get_slid(
1447                                                           alt_path)))));
1448                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1449                                 be16_to_cpu(
1450                                         alt_ext ? 0 :
1451                                                   htons(ntohl(sa_path_get_dlid(
1452                                                           alt_path)))));
1453                 } else {
1454                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1455                                 be16_to_cpu(IB_LID_PERMISSIVE));
1456                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1457                                 be16_to_cpu(IB_LID_PERMISSIVE));
1458                 }
1459                 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1460                         be32_to_cpu(alt_path->flow_label));
1461                 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1462                 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1463                         alt_path->traffic_class);
1464                 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1465                         alt_path->hop_limit);
1466                 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1467                 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1468                         (alt_path->hop_limit <= 1));
1469                 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1470                         cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1471                                        alt_path->packet_life_time));
1472         }
1473         IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1474
1475         if (param->private_data && param->private_data_len)
1476                 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1477                             param->private_data_len);
1478 }
1479
1480 static int cm_validate_req_param(struct ib_cm_req_param *param)
1481 {
1482         if (!param->primary_path)
1483                 return -EINVAL;
1484
1485         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1486             param->qp_type != IB_QPT_XRC_INI)
1487                 return -EINVAL;
1488
1489         if (param->private_data &&
1490             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1491                 return -EINVAL;
1492
1493         if (param->alternate_path &&
1494             (param->alternate_path->pkey != param->primary_path->pkey ||
1495              param->alternate_path->mtu != param->primary_path->mtu))
1496                 return -EINVAL;
1497
1498         return 0;
1499 }
1500
1501 int ib_send_cm_req(struct ib_cm_id *cm_id,
1502                    struct ib_cm_req_param *param)
1503 {
1504         struct cm_id_private *cm_id_priv;
1505         struct cm_req_msg *req_msg;
1506         unsigned long flags;
1507         int ret;
1508
1509         ret = cm_validate_req_param(param);
1510         if (ret)
1511                 return ret;
1512
1513         /* Verify that we're not in timewait. */
1514         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1515         spin_lock_irqsave(&cm_id_priv->lock, flags);
1516         if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1517                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1518                 ret = -EINVAL;
1519                 goto out;
1520         }
1521         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1522
1523         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1524                                                             id.local_id);
1525         if (IS_ERR(cm_id_priv->timewait_info)) {
1526                 ret = PTR_ERR(cm_id_priv->timewait_info);
1527                 cm_id_priv->timewait_info = NULL;
1528                 goto out;
1529         }
1530
1531         ret = cm_init_av_by_path(param->primary_path,
1532                                  param->ppath_sgid_attr, &cm_id_priv->av,
1533                                  cm_id_priv);
1534         if (ret)
1535                 goto out;
1536         if (param->alternate_path) {
1537                 ret = cm_init_av_by_path(param->alternate_path, NULL,
1538                                          &cm_id_priv->alt_av, cm_id_priv);
1539                 if (ret)
1540                         goto out;
1541         }
1542         cm_id->service_id = param->service_id;
1543         cm_id->service_mask = ~cpu_to_be64(0);
1544         cm_id_priv->timeout_ms = cm_convert_to_ms(
1545                                     param->primary_path->packet_life_time) * 2 +
1546                                  cm_convert_to_ms(
1547                                     param->remote_cm_response_timeout);
1548         cm_id_priv->max_cm_retries = param->max_cm_retries;
1549         cm_id_priv->initiator_depth = param->initiator_depth;
1550         cm_id_priv->responder_resources = param->responder_resources;
1551         cm_id_priv->retry_count = param->retry_count;
1552         cm_id_priv->path_mtu = param->primary_path->mtu;
1553         cm_id_priv->pkey = param->primary_path->pkey;
1554         cm_id_priv->qp_type = param->qp_type;
1555
1556         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1557         if (ret)
1558                 goto out;
1559
1560         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1561         cm_format_req(req_msg, cm_id_priv, param);
1562         cm_id_priv->tid = req_msg->hdr.tid;
1563         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1564         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1565
1566         cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1567         cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1568
1569         trace_icm_send_req(&cm_id_priv->id);
1570         spin_lock_irqsave(&cm_id_priv->lock, flags);
1571         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1572         if (ret) {
1573                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1574                 goto error2;
1575         }
1576         BUG_ON(cm_id->state != IB_CM_IDLE);
1577         cm_id->state = IB_CM_REQ_SENT;
1578         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1579         return 0;
1580
1581 error2: cm_free_msg(cm_id_priv->msg);
1582 out:    return ret;
1583 }
1584 EXPORT_SYMBOL(ib_send_cm_req);
1585
1586 static int cm_issue_rej(struct cm_port *port,
1587                         struct ib_mad_recv_wc *mad_recv_wc,
1588                         enum ib_cm_rej_reason reason,
1589                         enum cm_msg_response msg_rejected,
1590                         void *ari, u8 ari_length)
1591 {
1592         struct ib_mad_send_buf *msg = NULL;
1593         struct cm_rej_msg *rej_msg, *rcv_msg;
1594         int ret;
1595
1596         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1597         if (ret)
1598                 return ret;
1599
1600         /* We just need common CM header information.  Cast to any message. */
1601         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1602         rej_msg = (struct cm_rej_msg *) msg->mad;
1603
1604         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1605         IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1606                 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1607         IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1608                 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1609         IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1610         IBA_SET(CM_REJ_REASON, rej_msg, reason);
1611
1612         if (ari && ari_length) {
1613                 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1614                 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1615         }
1616
1617         trace_icm_issue_rej(
1618                 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg),
1619                 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1620         ret = ib_post_send_mad(msg, NULL);
1621         if (ret)
1622                 cm_free_msg(msg);
1623
1624         return ret;
1625 }
1626
1627 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1628 {
1629         return ((cpu_to_be16(
1630                         IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1631                 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1632                                                req_msg))));
1633 }
1634
1635 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1636                                  struct sa_path_rec *path, union ib_gid *gid)
1637 {
1638         if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1639                 path->rec_type = SA_PATH_REC_TYPE_OPA;
1640         else
1641                 path->rec_type = SA_PATH_REC_TYPE_IB;
1642 }
1643
1644 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1645                                         struct sa_path_rec *primary_path,
1646                                         struct sa_path_rec *alt_path,
1647                                         struct ib_wc *wc)
1648 {
1649         u32 lid;
1650
1651         if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1652                 sa_path_set_dlid(primary_path, wc->slid);
1653                 sa_path_set_slid(primary_path,
1654                                  IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1655                                          req_msg));
1656         } else {
1657                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1658                         CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1659                 sa_path_set_dlid(primary_path, lid);
1660
1661                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1662                         CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1663                 sa_path_set_slid(primary_path, lid);
1664         }
1665
1666         if (!cm_req_has_alt_path(req_msg))
1667                 return;
1668
1669         if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1670                 sa_path_set_dlid(alt_path,
1671                                  IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1672                                          req_msg));
1673                 sa_path_set_slid(alt_path,
1674                                  IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1675                                          req_msg));
1676         } else {
1677                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1678                         CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1679                 sa_path_set_dlid(alt_path, lid);
1680
1681                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1682                         CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1683                 sa_path_set_slid(alt_path, lid);
1684         }
1685 }
1686
1687 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1688                                      struct sa_path_rec *primary_path,
1689                                      struct sa_path_rec *alt_path,
1690                                      struct ib_wc *wc)
1691 {
1692         primary_path->dgid =
1693                 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1694         primary_path->sgid =
1695                 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1696         primary_path->flow_label =
1697                 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1698         primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1699         primary_path->traffic_class =
1700                 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1701         primary_path->reversible = 1;
1702         primary_path->pkey =
1703                 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1704         primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1705         primary_path->mtu_selector = IB_SA_EQ;
1706         primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1707         primary_path->rate_selector = IB_SA_EQ;
1708         primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1709         primary_path->packet_life_time_selector = IB_SA_EQ;
1710         primary_path->packet_life_time =
1711                 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1712         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1713         primary_path->service_id =
1714                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1715         if (sa_path_is_roce(primary_path))
1716                 primary_path->roce.route_resolved = false;
1717
1718         if (cm_req_has_alt_path(req_msg)) {
1719                 alt_path->dgid = *IBA_GET_MEM_PTR(
1720                         CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1721                 alt_path->sgid = *IBA_GET_MEM_PTR(
1722                         CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1723                 alt_path->flow_label = cpu_to_be32(
1724                         IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1725                 alt_path->hop_limit =
1726                         IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1727                 alt_path->traffic_class =
1728                         IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1729                 alt_path->reversible = 1;
1730                 alt_path->pkey =
1731                         cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1732                 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1733                 alt_path->mtu_selector = IB_SA_EQ;
1734                 alt_path->mtu =
1735                         IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1736                 alt_path->rate_selector = IB_SA_EQ;
1737                 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1738                 alt_path->packet_life_time_selector = IB_SA_EQ;
1739                 alt_path->packet_life_time =
1740                         IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1741                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1742                 alt_path->service_id =
1743                         cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1744
1745                 if (sa_path_is_roce(alt_path))
1746                         alt_path->roce.route_resolved = false;
1747         }
1748         cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc);
1749 }
1750
1751 static u16 cm_get_bth_pkey(struct cm_work *work)
1752 {
1753         struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1754         u8 port_num = work->port->port_num;
1755         u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1756         u16 pkey;
1757         int ret;
1758
1759         ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1760         if (ret) {
1761                 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1762                                      port_num, pkey_index, ret);
1763                 return 0;
1764         }
1765
1766         return pkey;
1767 }
1768
1769 /**
1770  * Convert OPA SGID to IB SGID
1771  * ULPs (such as IPoIB) do not understand OPA GIDs and will
1772  * reject them as the local_gid will not match the sgid. Therefore,
1773  * change the pathrec's SGID to an IB SGID.
1774  *
1775  * @work: Work completion
1776  * @path: Path record
1777  */
1778 static void cm_opa_to_ib_sgid(struct cm_work *work,
1779                               struct sa_path_rec *path)
1780 {
1781         struct ib_device *dev = work->port->cm_dev->ib_device;
1782         u8 port_num = work->port->port_num;
1783
1784         if (rdma_cap_opa_ah(dev, port_num) &&
1785             (ib_is_opa_gid(&path->sgid))) {
1786                 union ib_gid sgid;
1787
1788                 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1789                         dev_warn(&dev->dev,
1790                                  "Error updating sgid in CM request\n");
1791                         return;
1792                 }
1793
1794                 path->sgid = sgid;
1795         }
1796 }
1797
1798 static void cm_format_req_event(struct cm_work *work,
1799                                 struct cm_id_private *cm_id_priv,
1800                                 struct ib_cm_id *listen_id)
1801 {
1802         struct cm_req_msg *req_msg;
1803         struct ib_cm_req_event_param *param;
1804
1805         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1806         param = &work->cm_event.param.req_rcvd;
1807         param->listen_id = listen_id;
1808         param->bth_pkey = cm_get_bth_pkey(work);
1809         param->port = cm_id_priv->av.port->port_num;
1810         param->primary_path = &work->path[0];
1811         cm_opa_to_ib_sgid(work, param->primary_path);
1812         if (cm_req_has_alt_path(req_msg)) {
1813                 param->alternate_path = &work->path[1];
1814                 cm_opa_to_ib_sgid(work, param->alternate_path);
1815         } else {
1816                 param->alternate_path = NULL;
1817         }
1818         param->remote_ca_guid =
1819                 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1820         param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1821         param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1822         param->qp_type = cm_req_get_qp_type(req_msg);
1823         param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1824         param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1825         param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1826         param->local_cm_response_timeout =
1827                 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1828         param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1829         param->remote_cm_response_timeout =
1830                 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1831         param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1832         param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1833         param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1834         param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1835         param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1836         param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1837
1838         work->cm_event.private_data =
1839                 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1840 }
1841
1842 static void cm_process_work(struct cm_id_private *cm_id_priv,
1843                             struct cm_work *work)
1844 {
1845         int ret;
1846
1847         /* We will typically only have the current event to report. */
1848         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1849         cm_free_work(work);
1850
1851         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1852                 spin_lock_irq(&cm_id_priv->lock);
1853                 work = cm_dequeue_work(cm_id_priv);
1854                 spin_unlock_irq(&cm_id_priv->lock);
1855                 if (!work)
1856                         return;
1857
1858                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1859                                                 &work->cm_event);
1860                 cm_free_work(work);
1861         }
1862         cm_deref_id(cm_id_priv);
1863         if (ret)
1864                 cm_destroy_id(&cm_id_priv->id, ret);
1865 }
1866
1867 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1868                           struct cm_id_private *cm_id_priv,
1869                           enum cm_msg_response msg_mraed, u8 service_timeout,
1870                           const void *private_data, u8 private_data_len)
1871 {
1872         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1873         IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1874         IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1875                 be32_to_cpu(cm_id_priv->id.local_id));
1876         IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1877                 be32_to_cpu(cm_id_priv->id.remote_id));
1878         IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1879
1880         if (private_data && private_data_len)
1881                 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1882                             private_data_len);
1883 }
1884
1885 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1886                           struct cm_id_private *cm_id_priv,
1887                           enum ib_cm_rej_reason reason, void *ari,
1888                           u8 ari_length, const void *private_data,
1889                           u8 private_data_len, enum ib_cm_state state)
1890 {
1891         lockdep_assert_held(&cm_id_priv->lock);
1892
1893         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1894         IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1895                 be32_to_cpu(cm_id_priv->id.remote_id));
1896
1897         switch (state) {
1898         case IB_CM_REQ_RCVD:
1899                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1900                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1901                 break;
1902         case IB_CM_MRA_REQ_SENT:
1903                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1904                         be32_to_cpu(cm_id_priv->id.local_id));
1905                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1906                 break;
1907         case IB_CM_REP_RCVD:
1908         case IB_CM_MRA_REP_SENT:
1909                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1910                         be32_to_cpu(cm_id_priv->id.local_id));
1911                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1912                 break;
1913         default:
1914                 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1915                         be32_to_cpu(cm_id_priv->id.local_id));
1916                 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1917                         CM_MSG_RESPONSE_OTHER);
1918                 break;
1919         }
1920
1921         IBA_SET(CM_REJ_REASON, rej_msg, reason);
1922         if (ari && ari_length) {
1923                 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1924                 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1925         }
1926
1927         if (private_data && private_data_len)
1928                 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1929                             private_data_len);
1930 }
1931
1932 static void cm_dup_req_handler(struct cm_work *work,
1933                                struct cm_id_private *cm_id_priv)
1934 {
1935         struct ib_mad_send_buf *msg = NULL;
1936         int ret;
1937
1938         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1939                         counter[CM_REQ_COUNTER]);
1940
1941         /* Quick state check to discard duplicate REQs. */
1942         spin_lock_irq(&cm_id_priv->lock);
1943         if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1944                 spin_unlock_irq(&cm_id_priv->lock);
1945                 return;
1946         }
1947         spin_unlock_irq(&cm_id_priv->lock);
1948
1949         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1950         if (ret)
1951                 return;
1952
1953         spin_lock_irq(&cm_id_priv->lock);
1954         switch (cm_id_priv->id.state) {
1955         case IB_CM_MRA_REQ_SENT:
1956                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1957                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1958                               cm_id_priv->private_data,
1959                               cm_id_priv->private_data_len);
1960                 break;
1961         case IB_CM_TIMEWAIT:
1962                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1963                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1964                               IB_CM_TIMEWAIT);
1965                 break;
1966         default:
1967                 goto unlock;
1968         }
1969         spin_unlock_irq(&cm_id_priv->lock);
1970
1971         trace_icm_send_dup_req(&cm_id_priv->id);
1972         ret = ib_post_send_mad(msg, NULL);
1973         if (ret)
1974                 goto free;
1975         return;
1976
1977 unlock: spin_unlock_irq(&cm_id_priv->lock);
1978 free:   cm_free_msg(msg);
1979 }
1980
1981 static struct cm_id_private * cm_match_req(struct cm_work *work,
1982                                            struct cm_id_private *cm_id_priv)
1983 {
1984         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1985         struct cm_timewait_info *timewait_info;
1986         struct cm_req_msg *req_msg;
1987
1988         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1989
1990         /* Check for possible duplicate REQ. */
1991         spin_lock_irq(&cm.lock);
1992         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1993         if (timewait_info) {
1994                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1995                                            timewait_info->work.remote_id);
1996                 spin_unlock_irq(&cm.lock);
1997                 if (cur_cm_id_priv) {
1998                         cm_dup_req_handler(work, cur_cm_id_priv);
1999                         cm_deref_id(cur_cm_id_priv);
2000                 }
2001                 return NULL;
2002         }
2003
2004         /* Check for stale connections. */
2005         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2006         if (timewait_info) {
2007                 cm_remove_remote(cm_id_priv);
2008                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2009                                            timewait_info->work.remote_id);
2010
2011                 spin_unlock_irq(&cm.lock);
2012                 cm_issue_rej(work->port, work->mad_recv_wc,
2013                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
2014                              NULL, 0);
2015                 if (cur_cm_id_priv) {
2016                         ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2017                         cm_deref_id(cur_cm_id_priv);
2018                 }
2019                 return NULL;
2020         }
2021
2022         /* Find matching listen request. */
2023         listen_cm_id_priv = cm_find_listen(
2024                 cm_id_priv->id.device,
2025                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2026         if (!listen_cm_id_priv) {
2027                 cm_remove_remote(cm_id_priv);
2028                 spin_unlock_irq(&cm.lock);
2029                 cm_issue_rej(work->port, work->mad_recv_wc,
2030                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2031                              NULL, 0);
2032                 return NULL;
2033         }
2034         spin_unlock_irq(&cm.lock);
2035         return listen_cm_id_priv;
2036 }
2037
2038 /*
2039  * Work-around for inter-subnet connections.  If the LIDs are permissive,
2040  * we need to override the LID/SL data in the REQ with the LID information
2041  * in the work completion.
2042  */
2043 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2044 {
2045         if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2046                 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2047                                         req_msg)) == IB_LID_PERMISSIVE) {
2048                         IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2049                                 be16_to_cpu(ib_lid_be16(wc->slid)));
2050                         IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2051                 }
2052
2053                 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2054                                         req_msg)) == IB_LID_PERMISSIVE)
2055                         IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2056                                 wc->dlid_path_bits);
2057         }
2058
2059         if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2060                 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2061                                         req_msg)) == IB_LID_PERMISSIVE) {
2062                         IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2063                                 be16_to_cpu(ib_lid_be16(wc->slid)));
2064                         IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2065                 }
2066
2067                 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2068                                         req_msg)) == IB_LID_PERMISSIVE)
2069                         IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2070                                 wc->dlid_path_bits);
2071         }
2072 }
2073
2074 static int cm_req_handler(struct cm_work *work)
2075 {
2076         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2077         struct cm_req_msg *req_msg;
2078         const struct ib_global_route *grh;
2079         const struct ib_gid_attr *gid_attr;
2080         int ret;
2081
2082         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2083
2084         cm_id_priv =
2085                 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2086         if (IS_ERR(cm_id_priv))
2087                 return PTR_ERR(cm_id_priv);
2088
2089         cm_id_priv->id.remote_id =
2090                 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2091         cm_id_priv->id.service_id =
2092                 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2093         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
2094         cm_id_priv->tid = req_msg->hdr.tid;
2095         cm_id_priv->timeout_ms = cm_convert_to_ms(
2096                 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2097         cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2098         cm_id_priv->remote_qpn =
2099                 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2100         cm_id_priv->initiator_depth =
2101                 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2102         cm_id_priv->responder_resources =
2103                 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2104         cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2105         cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2106         cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2107         cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2108         cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2109         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2110
2111         ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2112                                       work->mad_recv_wc->recv_buf.grh,
2113                                       &cm_id_priv->av);
2114         if (ret)
2115                 goto destroy;
2116         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2117                                                             id.local_id);
2118         if (IS_ERR(cm_id_priv->timewait_info)) {
2119                 ret = PTR_ERR(cm_id_priv->timewait_info);
2120                 cm_id_priv->timewait_info = NULL;
2121                 goto destroy;
2122         }
2123         cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2124         cm_id_priv->timewait_info->remote_ca_guid =
2125                 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2126         cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2127
2128         /*
2129          * Note that the ID pointer is not in the xarray at this point,
2130          * so this set is only visible to the local thread.
2131          */
2132         cm_id_priv->id.state = IB_CM_REQ_RCVD;
2133
2134         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2135         if (!listen_cm_id_priv) {
2136                 trace_icm_no_listener_err(&cm_id_priv->id);
2137                 cm_id_priv->id.state = IB_CM_IDLE;
2138                 ret = -EINVAL;
2139                 goto destroy;
2140         }
2141
2142         if (cm_id_priv->av.ah_attr.type != RDMA_AH_ATTR_TYPE_ROCE)
2143                 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2144
2145         memset(&work->path[0], 0, sizeof(work->path[0]));
2146         if (cm_req_has_alt_path(req_msg))
2147                 memset(&work->path[1], 0, sizeof(work->path[1]));
2148         grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2149         gid_attr = grh->sgid_attr;
2150
2151         if (gid_attr &&
2152             rdma_protocol_roce(work->port->cm_dev->ib_device,
2153                                work->port->port_num)) {
2154                 work->path[0].rec_type =
2155                         sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2156         } else {
2157                 cm_path_set_rec_type(
2158                         work->port->cm_dev->ib_device, work->port->port_num,
2159                         &work->path[0],
2160                         IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2161                                         req_msg));
2162         }
2163         if (cm_req_has_alt_path(req_msg))
2164                 work->path[1].rec_type = work->path[0].rec_type;
2165         cm_format_paths_from_req(req_msg, &work->path[0],
2166                                  &work->path[1], work->mad_recv_wc->wc);
2167         if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2168                 sa_path_set_dmac(&work->path[0],
2169                                  cm_id_priv->av.ah_attr.roce.dmac);
2170         work->path[0].hop_limit = grh->hop_limit;
2171         ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2172                                  cm_id_priv);
2173         if (ret) {
2174                 int err;
2175
2176                 err = rdma_query_gid(work->port->cm_dev->ib_device,
2177                                      work->port->port_num, 0,
2178                                      &work->path[0].sgid);
2179                 if (err)
2180                         ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2181                                        NULL, 0, NULL, 0);
2182                 else
2183                         ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2184                                        &work->path[0].sgid,
2185                                        sizeof(work->path[0].sgid),
2186                                        NULL, 0);
2187                 goto rejected;
2188         }
2189         if (cm_req_has_alt_path(req_msg)) {
2190                 ret = cm_init_av_by_path(&work->path[1], NULL,
2191                                          &cm_id_priv->alt_av, cm_id_priv);
2192                 if (ret) {
2193                         ib_send_cm_rej(&cm_id_priv->id,
2194                                        IB_CM_REJ_INVALID_ALT_GID,
2195                                        &work->path[0].sgid,
2196                                        sizeof(work->path[0].sgid), NULL, 0);
2197                         goto rejected;
2198                 }
2199         }
2200
2201         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2202         cm_id_priv->id.context = listen_cm_id_priv->id.context;
2203         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2204
2205         /* Now MAD handlers can see the new ID */
2206         spin_lock_irq(&cm_id_priv->lock);
2207         cm_finalize_id(cm_id_priv);
2208
2209         /* Refcount belongs to the event, pairs with cm_process_work() */
2210         refcount_inc(&cm_id_priv->refcount);
2211         cm_queue_work_unlock(cm_id_priv, work);
2212         /*
2213          * Since this ID was just created and was not made visible to other MAD
2214          * handlers until the cm_finalize_id() above we know that the
2215          * cm_process_work() will deliver the event and the listen_cm_id
2216          * embedded in the event can be derefed here.
2217          */
2218         cm_deref_id(listen_cm_id_priv);
2219         return 0;
2220
2221 rejected:
2222         cm_deref_id(listen_cm_id_priv);
2223 destroy:
2224         ib_destroy_cm_id(&cm_id_priv->id);
2225         return ret;
2226 }
2227
2228 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2229                           struct cm_id_private *cm_id_priv,
2230                           struct ib_cm_rep_param *param)
2231 {
2232         cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2233                               param->ece.attr_mod);
2234         IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2235                 be32_to_cpu(cm_id_priv->id.local_id));
2236         IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2237                 be32_to_cpu(cm_id_priv->id.remote_id));
2238         IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2239         IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2240                 param->responder_resources);
2241         IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2242                 cm_id_priv->av.port->cm_dev->ack_delay);
2243         IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2244         IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2245         IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2246                 be64_to_cpu(cm_id_priv->id.device->node_guid));
2247
2248         if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2249                 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2250                         param->initiator_depth);
2251                 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2252                         param->flow_control);
2253                 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2254                 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2255         } else {
2256                 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2257                 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2258         }
2259
2260         IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2261         IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2262         IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2263
2264         if (param->private_data && param->private_data_len)
2265                 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2266                             param->private_data_len);
2267 }
2268
2269 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2270                    struct ib_cm_rep_param *param)
2271 {
2272         struct cm_id_private *cm_id_priv;
2273         struct ib_mad_send_buf *msg;
2274         struct cm_rep_msg *rep_msg;
2275         unsigned long flags;
2276         int ret;
2277
2278         if (param->private_data &&
2279             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2280                 return -EINVAL;
2281
2282         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2283         spin_lock_irqsave(&cm_id_priv->lock, flags);
2284         if (cm_id->state != IB_CM_REQ_RCVD &&
2285             cm_id->state != IB_CM_MRA_REQ_SENT) {
2286                 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state);
2287                 ret = -EINVAL;
2288                 goto out;
2289         }
2290
2291         ret = cm_alloc_msg(cm_id_priv, &msg);
2292         if (ret)
2293                 goto out;
2294
2295         rep_msg = (struct cm_rep_msg *) msg->mad;
2296         cm_format_rep(rep_msg, cm_id_priv, param);
2297         msg->timeout_ms = cm_id_priv->timeout_ms;
2298         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2299
2300         trace_icm_send_rep(cm_id);
2301         ret = ib_post_send_mad(msg, NULL);
2302         if (ret) {
2303                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2304                 cm_free_msg(msg);
2305                 return ret;
2306         }
2307
2308         cm_id->state = IB_CM_REP_SENT;
2309         cm_id_priv->msg = msg;
2310         cm_id_priv->initiator_depth = param->initiator_depth;
2311         cm_id_priv->responder_resources = param->responder_resources;
2312         cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2313         WARN_ONCE(param->qp_num & 0xFF000000,
2314                   "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2315                   param->qp_num);
2316         cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2317
2318 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2319         return ret;
2320 }
2321 EXPORT_SYMBOL(ib_send_cm_rep);
2322
2323 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2324                           struct cm_id_private *cm_id_priv,
2325                           const void *private_data,
2326                           u8 private_data_len)
2327 {
2328         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2329         IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2330                 be32_to_cpu(cm_id_priv->id.local_id));
2331         IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2332                 be32_to_cpu(cm_id_priv->id.remote_id));
2333
2334         if (private_data && private_data_len)
2335                 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2336                             private_data_len);
2337 }
2338
2339 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2340                    const void *private_data,
2341                    u8 private_data_len)
2342 {
2343         struct cm_id_private *cm_id_priv;
2344         struct ib_mad_send_buf *msg;
2345         unsigned long flags;
2346         void *data;
2347         int ret;
2348
2349         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2350                 return -EINVAL;
2351
2352         data = cm_copy_private_data(private_data, private_data_len);
2353         if (IS_ERR(data))
2354                 return PTR_ERR(data);
2355
2356         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2357         spin_lock_irqsave(&cm_id_priv->lock, flags);
2358         if (cm_id->state != IB_CM_REP_RCVD &&
2359             cm_id->state != IB_CM_MRA_REP_SENT) {
2360                 trace_icm_send_cm_rtu_err(cm_id);
2361                 ret = -EINVAL;
2362                 goto error;
2363         }
2364
2365         ret = cm_alloc_msg(cm_id_priv, &msg);
2366         if (ret)
2367                 goto error;
2368
2369         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2370                       private_data, private_data_len);
2371
2372         trace_icm_send_rtu(cm_id);
2373         ret = ib_post_send_mad(msg, NULL);
2374         if (ret) {
2375                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2376                 cm_free_msg(msg);
2377                 kfree(data);
2378                 return ret;
2379         }
2380
2381         cm_id->state = IB_CM_ESTABLISHED;
2382         cm_set_private_data(cm_id_priv, data, private_data_len);
2383         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2384         return 0;
2385
2386 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2387         kfree(data);
2388         return ret;
2389 }
2390 EXPORT_SYMBOL(ib_send_cm_rtu);
2391
2392 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2393 {
2394         struct cm_rep_msg *rep_msg;
2395         struct ib_cm_rep_event_param *param;
2396
2397         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2398         param = &work->cm_event.param.rep_rcvd;
2399         param->remote_ca_guid =
2400                 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2401         param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2402         param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2403         param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2404         param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2405         param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2406         param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2407         param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2408         param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2409         param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2410         param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2411         param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2412         param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2413         param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2414         param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2415
2416         work->cm_event.private_data =
2417                 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2418 }
2419
2420 static void cm_dup_rep_handler(struct cm_work *work)
2421 {
2422         struct cm_id_private *cm_id_priv;
2423         struct cm_rep_msg *rep_msg;
2424         struct ib_mad_send_buf *msg = NULL;
2425         int ret;
2426
2427         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2428         cm_id_priv = cm_acquire_id(
2429                 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2430                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2431         if (!cm_id_priv)
2432                 return;
2433
2434         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2435                         counter[CM_REP_COUNTER]);
2436         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2437         if (ret)
2438                 goto deref;
2439
2440         spin_lock_irq(&cm_id_priv->lock);
2441         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2442                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2443                               cm_id_priv->private_data,
2444                               cm_id_priv->private_data_len);
2445         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2446                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2447                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2448                               cm_id_priv->private_data,
2449                               cm_id_priv->private_data_len);
2450         else
2451                 goto unlock;
2452         spin_unlock_irq(&cm_id_priv->lock);
2453
2454         trace_icm_send_dup_rep(&cm_id_priv->id);
2455         ret = ib_post_send_mad(msg, NULL);
2456         if (ret)
2457                 goto free;
2458         goto deref;
2459
2460 unlock: spin_unlock_irq(&cm_id_priv->lock);
2461 free:   cm_free_msg(msg);
2462 deref:  cm_deref_id(cm_id_priv);
2463 }
2464
2465 static int cm_rep_handler(struct cm_work *work)
2466 {
2467         struct cm_id_private *cm_id_priv;
2468         struct cm_rep_msg *rep_msg;
2469         int ret;
2470         struct cm_id_private *cur_cm_id_priv;
2471         struct cm_timewait_info *timewait_info;
2472
2473         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2474         cm_id_priv = cm_acquire_id(
2475                 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2476         if (!cm_id_priv) {
2477                 cm_dup_rep_handler(work);
2478                 trace_icm_remote_no_priv_err(
2479                          IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2480                 return -EINVAL;
2481         }
2482
2483         cm_format_rep_event(work, cm_id_priv->qp_type);
2484
2485         spin_lock_irq(&cm_id_priv->lock);
2486         switch (cm_id_priv->id.state) {
2487         case IB_CM_REQ_SENT:
2488         case IB_CM_MRA_REQ_RCVD:
2489                 break;
2490         default:
2491                 ret = -EINVAL;
2492                 trace_icm_rep_unknown_err(
2493                         IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2494                         IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2495                         cm_id_priv->id.state);
2496                 spin_unlock_irq(&cm_id_priv->lock);
2497                 goto error;
2498         }
2499
2500         cm_id_priv->timewait_info->work.remote_id =
2501                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2502         cm_id_priv->timewait_info->remote_ca_guid =
2503                 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2504         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2505
2506         spin_lock(&cm.lock);
2507         /* Check for duplicate REP. */
2508         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2509                 spin_unlock(&cm.lock);
2510                 spin_unlock_irq(&cm_id_priv->lock);
2511                 ret = -EINVAL;
2512                 trace_icm_insert_failed_err(
2513                          IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2514                 goto error;
2515         }
2516         /* Check for a stale connection. */
2517         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2518         if (timewait_info) {
2519                 cm_remove_remote(cm_id_priv);
2520                 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2521                                            timewait_info->work.remote_id);
2522
2523                 spin_unlock(&cm.lock);
2524                 spin_unlock_irq(&cm_id_priv->lock);
2525                 cm_issue_rej(work->port, work->mad_recv_wc,
2526                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2527                              NULL, 0);
2528                 ret = -EINVAL;
2529                 trace_icm_staleconn_err(
2530                         IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2531                         IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2532
2533                 if (cur_cm_id_priv) {
2534                         ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2535                         cm_deref_id(cur_cm_id_priv);
2536                 }
2537
2538                 goto error;
2539         }
2540         spin_unlock(&cm.lock);
2541
2542         cm_id_priv->id.state = IB_CM_REP_RCVD;
2543         cm_id_priv->id.remote_id =
2544                 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2545         cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2546         cm_id_priv->initiator_depth =
2547                 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2548         cm_id_priv->responder_resources =
2549                 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2550         cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2551         cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2552         cm_id_priv->target_ack_delay =
2553                 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2554         cm_id_priv->av.timeout =
2555                         cm_ack_timeout(cm_id_priv->target_ack_delay,
2556                                        cm_id_priv->av.timeout - 1);
2557         cm_id_priv->alt_av.timeout =
2558                         cm_ack_timeout(cm_id_priv->target_ack_delay,
2559                                        cm_id_priv->alt_av.timeout - 1);
2560
2561         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2562         cm_queue_work_unlock(cm_id_priv, work);
2563         return 0;
2564
2565 error:
2566         cm_deref_id(cm_id_priv);
2567         return ret;
2568 }
2569
2570 static int cm_establish_handler(struct cm_work *work)
2571 {
2572         struct cm_id_private *cm_id_priv;
2573
2574         /* See comment in cm_establish about lookup. */
2575         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2576         if (!cm_id_priv)
2577                 return -EINVAL;
2578
2579         spin_lock_irq(&cm_id_priv->lock);
2580         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2581                 spin_unlock_irq(&cm_id_priv->lock);
2582                 goto out;
2583         }
2584
2585         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2586         cm_queue_work_unlock(cm_id_priv, work);
2587         return 0;
2588 out:
2589         cm_deref_id(cm_id_priv);
2590         return -EINVAL;
2591 }
2592
2593 static int cm_rtu_handler(struct cm_work *work)
2594 {
2595         struct cm_id_private *cm_id_priv;
2596         struct cm_rtu_msg *rtu_msg;
2597
2598         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2599         cm_id_priv = cm_acquire_id(
2600                 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2601                 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2602         if (!cm_id_priv)
2603                 return -EINVAL;
2604
2605         work->cm_event.private_data =
2606                 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2607
2608         spin_lock_irq(&cm_id_priv->lock);
2609         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2610             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2611                 spin_unlock_irq(&cm_id_priv->lock);
2612                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2613                                 counter[CM_RTU_COUNTER]);
2614                 goto out;
2615         }
2616         cm_id_priv->id.state = IB_CM_ESTABLISHED;
2617
2618         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2619         cm_queue_work_unlock(cm_id_priv, work);
2620         return 0;
2621 out:
2622         cm_deref_id(cm_id_priv);
2623         return -EINVAL;
2624 }
2625
2626 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2627                           struct cm_id_private *cm_id_priv,
2628                           const void *private_data,
2629                           u8 private_data_len)
2630 {
2631         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2632                           cm_form_tid(cm_id_priv));
2633         IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2634                 be32_to_cpu(cm_id_priv->id.local_id));
2635         IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2636                 be32_to_cpu(cm_id_priv->id.remote_id));
2637         IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2638                 be32_to_cpu(cm_id_priv->remote_qpn));
2639
2640         if (private_data && private_data_len)
2641                 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2642                             private_data_len);
2643 }
2644
2645 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2646                                const void *private_data, u8 private_data_len)
2647 {
2648         struct ib_mad_send_buf *msg;
2649         int ret;
2650
2651         lockdep_assert_held(&cm_id_priv->lock);
2652
2653         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2654                 return -EINVAL;
2655
2656         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2657                 trace_icm_dreq_skipped(&cm_id_priv->id);
2658                 return -EINVAL;
2659         }
2660
2661         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2662             cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2663                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2664
2665         ret = cm_alloc_msg(cm_id_priv, &msg);
2666         if (ret) {
2667                 cm_enter_timewait(cm_id_priv);
2668                 return ret;
2669         }
2670
2671         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2672                        private_data, private_data_len);
2673         msg->timeout_ms = cm_id_priv->timeout_ms;
2674         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2675
2676         trace_icm_send_dreq(&cm_id_priv->id);
2677         ret = ib_post_send_mad(msg, NULL);
2678         if (ret) {
2679                 cm_enter_timewait(cm_id_priv);
2680                 cm_free_msg(msg);
2681                 return ret;
2682         }
2683
2684         cm_id_priv->id.state = IB_CM_DREQ_SENT;
2685         cm_id_priv->msg = msg;
2686         return 0;
2687 }
2688
2689 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2690                     u8 private_data_len)
2691 {
2692         struct cm_id_private *cm_id_priv =
2693                 container_of(cm_id, struct cm_id_private, id);
2694         unsigned long flags;
2695         int ret;
2696
2697         spin_lock_irqsave(&cm_id_priv->lock, flags);
2698         ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2699         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2700         return ret;
2701 }
2702 EXPORT_SYMBOL(ib_send_cm_dreq);
2703
2704 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2705                           struct cm_id_private *cm_id_priv,
2706                           const void *private_data,
2707                           u8 private_data_len)
2708 {
2709         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2710         IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2711                 be32_to_cpu(cm_id_priv->id.local_id));
2712         IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2713                 be32_to_cpu(cm_id_priv->id.remote_id));
2714
2715         if (private_data && private_data_len)
2716                 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2717                             private_data_len);
2718 }
2719
2720 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2721                                void *private_data, u8 private_data_len)
2722 {
2723         struct ib_mad_send_buf *msg;
2724         int ret;
2725
2726         lockdep_assert_held(&cm_id_priv->lock);
2727
2728         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2729                 return -EINVAL;
2730
2731         if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2732                 trace_icm_send_drep_err(&cm_id_priv->id);
2733                 kfree(private_data);
2734                 return -EINVAL;
2735         }
2736
2737         cm_set_private_data(cm_id_priv, private_data, private_data_len);
2738         cm_enter_timewait(cm_id_priv);
2739
2740         ret = cm_alloc_msg(cm_id_priv, &msg);
2741         if (ret)
2742                 return ret;
2743
2744         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2745                        private_data, private_data_len);
2746
2747         trace_icm_send_drep(&cm_id_priv->id);
2748         ret = ib_post_send_mad(msg, NULL);
2749         if (ret) {
2750                 cm_free_msg(msg);
2751                 return ret;
2752         }
2753         return 0;
2754 }
2755
2756 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2757                     u8 private_data_len)
2758 {
2759         struct cm_id_private *cm_id_priv =
2760                 container_of(cm_id, struct cm_id_private, id);
2761         unsigned long flags;
2762         void *data;
2763         int ret;
2764
2765         data = cm_copy_private_data(private_data, private_data_len);
2766         if (IS_ERR(data))
2767                 return PTR_ERR(data);
2768
2769         spin_lock_irqsave(&cm_id_priv->lock, flags);
2770         ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2771         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2772         return ret;
2773 }
2774 EXPORT_SYMBOL(ib_send_cm_drep);
2775
2776 static int cm_issue_drep(struct cm_port *port,
2777                          struct ib_mad_recv_wc *mad_recv_wc)
2778 {
2779         struct ib_mad_send_buf *msg = NULL;
2780         struct cm_dreq_msg *dreq_msg;
2781         struct cm_drep_msg *drep_msg;
2782         int ret;
2783
2784         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2785         if (ret)
2786                 return ret;
2787
2788         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2789         drep_msg = (struct cm_drep_msg *) msg->mad;
2790
2791         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2792         IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2793                 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2794         IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2795                 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2796
2797         trace_icm_issue_drep(
2798                 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2799                 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2800         ret = ib_post_send_mad(msg, NULL);
2801         if (ret)
2802                 cm_free_msg(msg);
2803
2804         return ret;
2805 }
2806
2807 static int cm_dreq_handler(struct cm_work *work)
2808 {
2809         struct cm_id_private *cm_id_priv;
2810         struct cm_dreq_msg *dreq_msg;
2811         struct ib_mad_send_buf *msg = NULL;
2812
2813         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2814         cm_id_priv = cm_acquire_id(
2815                 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2816                 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2817         if (!cm_id_priv) {
2818                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2819                                 counter[CM_DREQ_COUNTER]);
2820                 cm_issue_drep(work->port, work->mad_recv_wc);
2821                 trace_icm_no_priv_err(
2822                         IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2823                         IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2824                 return -EINVAL;
2825         }
2826
2827         work->cm_event.private_data =
2828                 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2829
2830         spin_lock_irq(&cm_id_priv->lock);
2831         if (cm_id_priv->local_qpn !=
2832             cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2833                 goto unlock;
2834
2835         switch (cm_id_priv->id.state) {
2836         case IB_CM_REP_SENT:
2837         case IB_CM_DREQ_SENT:
2838                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2839                 break;
2840         case IB_CM_ESTABLISHED:
2841                 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2842                     cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2843                         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2844                 break;
2845         case IB_CM_MRA_REP_RCVD:
2846                 break;
2847         case IB_CM_TIMEWAIT:
2848                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2849                                 counter[CM_DREQ_COUNTER]);
2850                 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2851                 if (IS_ERR(msg))
2852                         goto unlock;
2853
2854                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2855                                cm_id_priv->private_data,
2856                                cm_id_priv->private_data_len);
2857                 spin_unlock_irq(&cm_id_priv->lock);
2858
2859                 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2860                     ib_post_send_mad(msg, NULL))
2861                         cm_free_msg(msg);
2862                 goto deref;
2863         case IB_CM_DREQ_RCVD:
2864                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2865                                 counter[CM_DREQ_COUNTER]);
2866                 goto unlock;
2867         default:
2868                 trace_icm_dreq_unknown_err(&cm_id_priv->id);
2869                 goto unlock;
2870         }
2871         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2872         cm_id_priv->tid = dreq_msg->hdr.tid;
2873         cm_queue_work_unlock(cm_id_priv, work);
2874         return 0;
2875
2876 unlock: spin_unlock_irq(&cm_id_priv->lock);
2877 deref:  cm_deref_id(cm_id_priv);
2878         return -EINVAL;
2879 }
2880
2881 static int cm_drep_handler(struct cm_work *work)
2882 {
2883         struct cm_id_private *cm_id_priv;
2884         struct cm_drep_msg *drep_msg;
2885
2886         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2887         cm_id_priv = cm_acquire_id(
2888                 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2889                 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2890         if (!cm_id_priv)
2891                 return -EINVAL;
2892
2893         work->cm_event.private_data =
2894                 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2895
2896         spin_lock_irq(&cm_id_priv->lock);
2897         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2898             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2899                 spin_unlock_irq(&cm_id_priv->lock);
2900                 goto out;
2901         }
2902         cm_enter_timewait(cm_id_priv);
2903
2904         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2905         cm_queue_work_unlock(cm_id_priv, work);
2906         return 0;
2907 out:
2908         cm_deref_id(cm_id_priv);
2909         return -EINVAL;
2910 }
2911
2912 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2913                               enum ib_cm_rej_reason reason, void *ari,
2914                               u8 ari_length, const void *private_data,
2915                               u8 private_data_len)
2916 {
2917         enum ib_cm_state state = cm_id_priv->id.state;
2918         struct ib_mad_send_buf *msg;
2919         int ret;
2920
2921         lockdep_assert_held(&cm_id_priv->lock);
2922
2923         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2924             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2925                 return -EINVAL;
2926
2927         switch (state) {
2928         case IB_CM_REQ_SENT:
2929         case IB_CM_MRA_REQ_RCVD:
2930         case IB_CM_REQ_RCVD:
2931         case IB_CM_MRA_REQ_SENT:
2932         case IB_CM_REP_RCVD:
2933         case IB_CM_MRA_REP_SENT:
2934                 cm_reset_to_idle(cm_id_priv);
2935                 ret = cm_alloc_msg(cm_id_priv, &msg);
2936                 if (ret)
2937                         return ret;
2938                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2939                               ari, ari_length, private_data, private_data_len,
2940                               state);
2941                 break;
2942         case IB_CM_REP_SENT:
2943         case IB_CM_MRA_REP_RCVD:
2944                 cm_enter_timewait(cm_id_priv);
2945                 ret = cm_alloc_msg(cm_id_priv, &msg);
2946                 if (ret)
2947                         return ret;
2948                 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2949                               ari, ari_length, private_data, private_data_len,
2950                               state);
2951                 break;
2952         default:
2953                 trace_icm_send_unknown_rej_err(&cm_id_priv->id);
2954                 return -EINVAL;
2955         }
2956
2957         trace_icm_send_rej(&cm_id_priv->id, reason);
2958         ret = ib_post_send_mad(msg, NULL);
2959         if (ret) {
2960                 cm_free_msg(msg);
2961                 return ret;
2962         }
2963
2964         return 0;
2965 }
2966
2967 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2968                    void *ari, u8 ari_length, const void *private_data,
2969                    u8 private_data_len)
2970 {
2971         struct cm_id_private *cm_id_priv =
2972                 container_of(cm_id, struct cm_id_private, id);
2973         unsigned long flags;
2974         int ret;
2975
2976         spin_lock_irqsave(&cm_id_priv->lock, flags);
2977         ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2978                                  private_data, private_data_len);
2979         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2980         return ret;
2981 }
2982 EXPORT_SYMBOL(ib_send_cm_rej);
2983
2984 static void cm_format_rej_event(struct cm_work *work)
2985 {
2986         struct cm_rej_msg *rej_msg;
2987         struct ib_cm_rej_event_param *param;
2988
2989         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2990         param = &work->cm_event.param.rej_rcvd;
2991         param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2992         param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2993         param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2994         work->cm_event.private_data =
2995                 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2996 }
2997
2998 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2999 {
3000         struct cm_id_private *cm_id_priv;
3001         __be32 remote_id;
3002
3003         remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
3004
3005         if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
3006                 cm_id_priv = cm_find_remote_id(
3007                         *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
3008                         remote_id);
3009         } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3010                    CM_MSG_RESPONSE_REQ)
3011                 cm_id_priv = cm_acquire_id(
3012                         cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3013                         0);
3014         else
3015                 cm_id_priv = cm_acquire_id(
3016                         cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3017                         remote_id);
3018
3019         return cm_id_priv;
3020 }
3021
3022 static int cm_rej_handler(struct cm_work *work)
3023 {
3024         struct cm_id_private *cm_id_priv;
3025         struct cm_rej_msg *rej_msg;
3026
3027         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3028         cm_id_priv = cm_acquire_rejected_id(rej_msg);
3029         if (!cm_id_priv)
3030                 return -EINVAL;
3031
3032         cm_format_rej_event(work);
3033
3034         spin_lock_irq(&cm_id_priv->lock);
3035         switch (cm_id_priv->id.state) {
3036         case IB_CM_REQ_SENT:
3037         case IB_CM_MRA_REQ_RCVD:
3038         case IB_CM_REP_SENT:
3039         case IB_CM_MRA_REP_RCVD:
3040                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3041                 fallthrough;
3042         case IB_CM_REQ_RCVD:
3043         case IB_CM_MRA_REQ_SENT:
3044                 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3045                         cm_enter_timewait(cm_id_priv);
3046                 else
3047                         cm_reset_to_idle(cm_id_priv);
3048                 break;
3049         case IB_CM_DREQ_SENT:
3050                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3051                 fallthrough;
3052         case IB_CM_REP_RCVD:
3053         case IB_CM_MRA_REP_SENT:
3054                 cm_enter_timewait(cm_id_priv);
3055                 break;
3056         case IB_CM_ESTABLISHED:
3057                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3058                     cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3059                         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3060                                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
3061                                               cm_id_priv->msg);
3062                         cm_enter_timewait(cm_id_priv);
3063                         break;
3064                 }
3065                 fallthrough;
3066         default:
3067                 trace_icm_rej_unknown_err(&cm_id_priv->id);
3068                 spin_unlock_irq(&cm_id_priv->lock);
3069                 goto out;
3070         }
3071
3072         cm_queue_work_unlock(cm_id_priv, work);
3073         return 0;
3074 out:
3075         cm_deref_id(cm_id_priv);
3076         return -EINVAL;
3077 }
3078
3079 int ib_send_cm_mra(struct ib_cm_id *cm_id,
3080                    u8 service_timeout,
3081                    const void *private_data,
3082                    u8 private_data_len)
3083 {
3084         struct cm_id_private *cm_id_priv;
3085         struct ib_mad_send_buf *msg;
3086         enum ib_cm_state cm_state;
3087         enum ib_cm_lap_state lap_state;
3088         enum cm_msg_response msg_response;
3089         void *data;
3090         unsigned long flags;
3091         int ret;
3092
3093         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3094                 return -EINVAL;
3095
3096         data = cm_copy_private_data(private_data, private_data_len);
3097         if (IS_ERR(data))
3098                 return PTR_ERR(data);
3099
3100         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3101
3102         spin_lock_irqsave(&cm_id_priv->lock, flags);
3103         switch(cm_id_priv->id.state) {
3104         case IB_CM_REQ_RCVD:
3105                 cm_state = IB_CM_MRA_REQ_SENT;
3106                 lap_state = cm_id->lap_state;
3107                 msg_response = CM_MSG_RESPONSE_REQ;
3108                 break;
3109         case IB_CM_REP_RCVD:
3110                 cm_state = IB_CM_MRA_REP_SENT;
3111                 lap_state = cm_id->lap_state;
3112                 msg_response = CM_MSG_RESPONSE_REP;
3113                 break;
3114         case IB_CM_ESTABLISHED:
3115                 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3116                         cm_state = cm_id->state;
3117                         lap_state = IB_CM_MRA_LAP_SENT;
3118                         msg_response = CM_MSG_RESPONSE_OTHER;
3119                         break;
3120                 }
3121                 fallthrough;
3122         default:
3123                 trace_icm_send_mra_unknown_err(&cm_id_priv->id);
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                 trace_icm_send_mra(cm_id);
3137                 ret = ib_post_send_mad(msg, NULL);
3138                 if (ret)
3139                         goto error2;
3140         }
3141
3142         cm_id->state = cm_state;
3143         cm_id->lap_state = lap_state;
3144         cm_id_priv->service_timeout = service_timeout;
3145         cm_set_private_data(cm_id_priv, data, private_data_len);
3146         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3147         return 0;
3148
3149 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3150         kfree(data);
3151         return ret;
3152
3153 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3154         kfree(data);
3155         cm_free_msg(msg);
3156         return ret;
3157 }
3158 EXPORT_SYMBOL(ib_send_cm_mra);
3159
3160 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3161 {
3162         switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3163         case CM_MSG_RESPONSE_REQ:
3164                 return cm_acquire_id(
3165                         cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3166                         0);
3167         case CM_MSG_RESPONSE_REP:
3168         case CM_MSG_RESPONSE_OTHER:
3169                 return cm_acquire_id(
3170                         cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3171                         cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3172         default:
3173                 return NULL;
3174         }
3175 }
3176
3177 static int cm_mra_handler(struct cm_work *work)
3178 {
3179         struct cm_id_private *cm_id_priv;
3180         struct cm_mra_msg *mra_msg;
3181         int timeout;
3182
3183         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3184         cm_id_priv = cm_acquire_mraed_id(mra_msg);
3185         if (!cm_id_priv)
3186                 return -EINVAL;
3187
3188         work->cm_event.private_data =
3189                 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3190         work->cm_event.param.mra_rcvd.service_timeout =
3191                 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3192         timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3193                   cm_convert_to_ms(cm_id_priv->av.timeout);
3194
3195         spin_lock_irq(&cm_id_priv->lock);
3196         switch (cm_id_priv->id.state) {
3197         case IB_CM_REQ_SENT:
3198                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3199                             CM_MSG_RESPONSE_REQ ||
3200                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
3201                                   cm_id_priv->msg, timeout))
3202                         goto out;
3203                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3204                 break;
3205         case IB_CM_REP_SENT:
3206                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3207                             CM_MSG_RESPONSE_REP ||
3208                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
3209                                   cm_id_priv->msg, timeout))
3210                         goto out;
3211                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3212                 break;
3213         case IB_CM_ESTABLISHED:
3214                 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3215                             CM_MSG_RESPONSE_OTHER ||
3216                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3217                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
3218                                   cm_id_priv->msg, timeout)) {
3219                         if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3220                                 atomic_long_inc(&work->port->
3221                                                 counter_group[CM_RECV_DUPLICATES].
3222                                                 counter[CM_MRA_COUNTER]);
3223                         goto out;
3224                 }
3225                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3226                 break;
3227         case IB_CM_MRA_REQ_RCVD:
3228         case IB_CM_MRA_REP_RCVD:
3229                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3230                                 counter[CM_MRA_COUNTER]);
3231                 fallthrough;
3232         default:
3233                 trace_icm_mra_unknown_err(&cm_id_priv->id);
3234                 goto out;
3235         }
3236
3237         cm_id_priv->msg->context[1] = (void *) (unsigned long)
3238                                       cm_id_priv->id.state;
3239         cm_queue_work_unlock(cm_id_priv, work);
3240         return 0;
3241 out:
3242         spin_unlock_irq(&cm_id_priv->lock);
3243         cm_deref_id(cm_id_priv);
3244         return -EINVAL;
3245 }
3246
3247 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3248                                         struct sa_path_rec *path)
3249 {
3250         u32 lid;
3251
3252         if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3253                 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3254                                                lap_msg));
3255                 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3256                                                lap_msg));
3257         } else {
3258                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3259                         CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3260                 sa_path_set_dlid(path, lid);
3261
3262                 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3263                         CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3264                 sa_path_set_slid(path, lid);
3265         }
3266 }
3267
3268 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3269                                     struct sa_path_rec *path,
3270                                     struct cm_lap_msg *lap_msg)
3271 {
3272         path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3273         path->sgid =
3274                 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3275         path->flow_label =
3276                 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3277         path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3278         path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3279         path->reversible = 1;
3280         path->pkey = cm_id_priv->pkey;
3281         path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3282         path->mtu_selector = IB_SA_EQ;
3283         path->mtu = cm_id_priv->path_mtu;
3284         path->rate_selector = IB_SA_EQ;
3285         path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3286         path->packet_life_time_selector = IB_SA_EQ;
3287         path->packet_life_time =
3288                 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3289         path->packet_life_time -= (path->packet_life_time > 0);
3290         cm_format_path_lid_from_lap(lap_msg, path);
3291 }
3292
3293 static int cm_lap_handler(struct cm_work *work)
3294 {
3295         struct cm_id_private *cm_id_priv;
3296         struct cm_lap_msg *lap_msg;
3297         struct ib_cm_lap_event_param *param;
3298         struct ib_mad_send_buf *msg = NULL;
3299         int ret;
3300
3301         /* Currently Alternate path messages are not supported for
3302          * RoCE link layer.
3303          */
3304         if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3305                                work->port->port_num))
3306                 return -EINVAL;
3307
3308         /* todo: verify LAP request and send reject APR if invalid. */
3309         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3310         cm_id_priv = cm_acquire_id(
3311                 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3312                 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3313         if (!cm_id_priv)
3314                 return -EINVAL;
3315
3316         param = &work->cm_event.param.lap_rcvd;
3317         memset(&work->path[0], 0, sizeof(work->path[1]));
3318         cm_path_set_rec_type(work->port->cm_dev->ib_device,
3319                              work->port->port_num, &work->path[0],
3320                              IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3321                                              lap_msg));
3322         param->alternate_path = &work->path[0];
3323         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3324         work->cm_event.private_data =
3325                 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3326
3327         spin_lock_irq(&cm_id_priv->lock);
3328         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3329                 goto unlock;
3330
3331         switch (cm_id_priv->id.lap_state) {
3332         case IB_CM_LAP_UNINIT:
3333         case IB_CM_LAP_IDLE:
3334                 break;
3335         case IB_CM_MRA_LAP_SENT:
3336                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3337                                 counter[CM_LAP_COUNTER]);
3338                 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3339                 if (IS_ERR(msg))
3340                         goto unlock;
3341
3342                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3343                               CM_MSG_RESPONSE_OTHER,
3344                               cm_id_priv->service_timeout,
3345                               cm_id_priv->private_data,
3346                               cm_id_priv->private_data_len);
3347                 spin_unlock_irq(&cm_id_priv->lock);
3348
3349                 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3350                     ib_post_send_mad(msg, NULL))
3351                         cm_free_msg(msg);
3352                 goto deref;
3353         case IB_CM_LAP_RCVD:
3354                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3355                                 counter[CM_LAP_COUNTER]);
3356                 goto unlock;
3357         default:
3358                 goto unlock;
3359         }
3360
3361         ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3362                                  work->mad_recv_wc->recv_buf.grh,
3363                                  &cm_id_priv->av);
3364         if (ret)
3365                 goto unlock;
3366
3367         ret = cm_init_av_by_path(param->alternate_path, NULL,
3368                                  &cm_id_priv->alt_av, cm_id_priv);
3369         if (ret)
3370                 goto unlock;
3371
3372         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3373         cm_id_priv->tid = lap_msg->hdr.tid;
3374         cm_queue_work_unlock(cm_id_priv, work);
3375         return 0;
3376
3377 unlock: spin_unlock_irq(&cm_id_priv->lock);
3378 deref:  cm_deref_id(cm_id_priv);
3379         return -EINVAL;
3380 }
3381
3382 static int cm_apr_handler(struct cm_work *work)
3383 {
3384         struct cm_id_private *cm_id_priv;
3385         struct cm_apr_msg *apr_msg;
3386
3387         /* Currently Alternate path messages are not supported for
3388          * RoCE link layer.
3389          */
3390         if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3391                                work->port->port_num))
3392                 return -EINVAL;
3393
3394         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3395         cm_id_priv = cm_acquire_id(
3396                 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3397                 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3398         if (!cm_id_priv)
3399                 return -EINVAL; /* Unmatched reply. */
3400
3401         work->cm_event.param.apr_rcvd.ap_status =
3402                 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3403         work->cm_event.param.apr_rcvd.apr_info =
3404                 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3405         work->cm_event.param.apr_rcvd.info_len =
3406                 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3407         work->cm_event.private_data =
3408                 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3409
3410         spin_lock_irq(&cm_id_priv->lock);
3411         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3412             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3413              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3414                 spin_unlock_irq(&cm_id_priv->lock);
3415                 goto out;
3416         }
3417         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3418         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3419         cm_id_priv->msg = NULL;
3420         cm_queue_work_unlock(cm_id_priv, work);
3421         return 0;
3422 out:
3423         cm_deref_id(cm_id_priv);
3424         return -EINVAL;
3425 }
3426
3427 static int cm_timewait_handler(struct cm_work *work)
3428 {
3429         struct cm_timewait_info *timewait_info;
3430         struct cm_id_private *cm_id_priv;
3431
3432         timewait_info = container_of(work, struct cm_timewait_info, work);
3433         spin_lock_irq(&cm.lock);
3434         list_del(&timewait_info->list);
3435         spin_unlock_irq(&cm.lock);
3436
3437         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3438                                    timewait_info->work.remote_id);
3439         if (!cm_id_priv)
3440                 return -EINVAL;
3441
3442         spin_lock_irq(&cm_id_priv->lock);
3443         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3444             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3445                 spin_unlock_irq(&cm_id_priv->lock);
3446                 goto out;
3447         }
3448         cm_id_priv->id.state = IB_CM_IDLE;
3449         cm_queue_work_unlock(cm_id_priv, work);
3450         return 0;
3451 out:
3452         cm_deref_id(cm_id_priv);
3453         return -EINVAL;
3454 }
3455
3456 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3457                                struct cm_id_private *cm_id_priv,
3458                                struct ib_cm_sidr_req_param *param)
3459 {
3460         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3461                           cm_form_tid(cm_id_priv));
3462         IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3463                 be32_to_cpu(cm_id_priv->id.local_id));
3464         IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3465                 be16_to_cpu(param->path->pkey));
3466         IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3467                 be64_to_cpu(param->service_id));
3468
3469         if (param->private_data && param->private_data_len)
3470                 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3471                             param->private_data, param->private_data_len);
3472 }
3473
3474 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3475                         struct ib_cm_sidr_req_param *param)
3476 {
3477         struct cm_id_private *cm_id_priv;
3478         struct ib_mad_send_buf *msg;
3479         unsigned long flags;
3480         int ret;
3481
3482         if (!param->path || (param->private_data &&
3483              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3484                 return -EINVAL;
3485
3486         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3487         ret = cm_init_av_by_path(param->path, param->sgid_attr,
3488                                  &cm_id_priv->av,
3489                                  cm_id_priv);
3490         if (ret)
3491                 goto out;
3492
3493         cm_id->service_id = param->service_id;
3494         cm_id->service_mask = ~cpu_to_be64(0);
3495         cm_id_priv->timeout_ms = param->timeout_ms;
3496         cm_id_priv->max_cm_retries = param->max_cm_retries;
3497         ret = cm_alloc_msg(cm_id_priv, &msg);
3498         if (ret)
3499                 goto out;
3500
3501         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3502                            param);
3503         msg->timeout_ms = cm_id_priv->timeout_ms;
3504         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3505
3506         spin_lock_irqsave(&cm_id_priv->lock, flags);
3507         if (cm_id->state == IB_CM_IDLE) {
3508                 trace_icm_send_sidr_req(&cm_id_priv->id);
3509                 ret = ib_post_send_mad(msg, NULL);
3510         } else {
3511                 ret = -EINVAL;
3512         }
3513
3514         if (ret) {
3515                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3516                 cm_free_msg(msg);
3517                 goto out;
3518         }
3519         cm_id->state = IB_CM_SIDR_REQ_SENT;
3520         cm_id_priv->msg = msg;
3521         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3522 out:
3523         return ret;
3524 }
3525 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3526
3527 static void cm_format_sidr_req_event(struct cm_work *work,
3528                                      const struct cm_id_private *rx_cm_id,
3529                                      struct ib_cm_id *listen_id)
3530 {
3531         struct cm_sidr_req_msg *sidr_req_msg;
3532         struct ib_cm_sidr_req_event_param *param;
3533
3534         sidr_req_msg = (struct cm_sidr_req_msg *)
3535                                 work->mad_recv_wc->recv_buf.mad;
3536         param = &work->cm_event.param.sidr_req_rcvd;
3537         param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3538         param->listen_id = listen_id;
3539         param->service_id =
3540                 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3541         param->bth_pkey = cm_get_bth_pkey(work);
3542         param->port = work->port->port_num;
3543         param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3544         work->cm_event.private_data =
3545                 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3546 }
3547
3548 static int cm_sidr_req_handler(struct cm_work *work)
3549 {
3550         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3551         struct cm_sidr_req_msg *sidr_req_msg;
3552         struct ib_wc *wc;
3553         int ret;
3554
3555         cm_id_priv =
3556                 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3557         if (IS_ERR(cm_id_priv))
3558                 return PTR_ERR(cm_id_priv);
3559
3560         /* Record SGID/SLID and request ID for lookup. */
3561         sidr_req_msg = (struct cm_sidr_req_msg *)
3562                                 work->mad_recv_wc->recv_buf.mad;
3563
3564         cm_id_priv->id.remote_id =
3565                 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3566         cm_id_priv->id.service_id =
3567                 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3568         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3569         cm_id_priv->tid = sidr_req_msg->hdr.tid;
3570
3571         wc = work->mad_recv_wc->wc;
3572         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3573         cm_id_priv->av.dgid.global.interface_id = 0;
3574         ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3575                                       work->mad_recv_wc->recv_buf.grh,
3576                                       &cm_id_priv->av);
3577         if (ret)
3578                 goto out;
3579
3580         spin_lock_irq(&cm.lock);
3581         listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3582         if (listen_cm_id_priv) {
3583                 spin_unlock_irq(&cm.lock);
3584                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3585                                 counter[CM_SIDR_REQ_COUNTER]);
3586                 goto out; /* Duplicate message. */
3587         }
3588         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3589         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3590                                            cm_id_priv->id.service_id);
3591         if (!listen_cm_id_priv) {
3592                 spin_unlock_irq(&cm.lock);
3593                 ib_send_cm_sidr_rep(&cm_id_priv->id,
3594                                     &(struct ib_cm_sidr_rep_param){
3595                                             .status = IB_SIDR_UNSUPPORTED });
3596                 goto out; /* No match. */
3597         }
3598         spin_unlock_irq(&cm.lock);
3599
3600         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3601         cm_id_priv->id.context = listen_cm_id_priv->id.context;
3602
3603         /*
3604          * A SIDR ID does not need to be in the xarray since it does not receive
3605          * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3606          * not enter timewait.
3607          */
3608
3609         cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3610         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3611         cm_free_work(work);
3612         /*
3613          * A pointer to the listen_cm_id is held in the event, so this deref
3614          * must be after the event is delivered above.
3615          */
3616         cm_deref_id(listen_cm_id_priv);
3617         if (ret)
3618                 cm_destroy_id(&cm_id_priv->id, ret);
3619         return 0;
3620 out:
3621         ib_destroy_cm_id(&cm_id_priv->id);
3622         return -EINVAL;
3623 }
3624
3625 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3626                                struct cm_id_private *cm_id_priv,
3627                                struct ib_cm_sidr_rep_param *param)
3628 {
3629         cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3630                               cm_id_priv->tid, param->ece.attr_mod);
3631         IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3632                 be32_to_cpu(cm_id_priv->id.remote_id));
3633         IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3634         IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3635         IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3636                 be64_to_cpu(cm_id_priv->id.service_id));
3637         IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3638         IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3639                 param->ece.vendor_id & 0xFF);
3640         IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3641                 (param->ece.vendor_id >> 8) & 0xFF);
3642
3643         if (param->info && param->info_length)
3644                 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3645                             param->info, param->info_length);
3646
3647         if (param->private_data && param->private_data_len)
3648                 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3649                             param->private_data, param->private_data_len);
3650 }
3651
3652 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3653                                    struct ib_cm_sidr_rep_param *param)
3654 {
3655         struct ib_mad_send_buf *msg;
3656         unsigned long flags;
3657         int ret;
3658
3659         lockdep_assert_held(&cm_id_priv->lock);
3660
3661         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3662             (param->private_data &&
3663              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3664                 return -EINVAL;
3665
3666         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3667                 return -EINVAL;
3668
3669         ret = cm_alloc_msg(cm_id_priv, &msg);
3670         if (ret)
3671                 return ret;
3672
3673         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3674                            param);
3675         trace_icm_send_sidr_rep(&cm_id_priv->id);
3676         ret = ib_post_send_mad(msg, NULL);
3677         if (ret) {
3678                 cm_free_msg(msg);
3679                 return ret;
3680         }
3681         cm_id_priv->id.state = IB_CM_IDLE;
3682         spin_lock_irqsave(&cm.lock, flags);
3683         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3684                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3685                 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3686         }
3687         spin_unlock_irqrestore(&cm.lock, flags);
3688         return 0;
3689 }
3690
3691 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3692                         struct ib_cm_sidr_rep_param *param)
3693 {
3694         struct cm_id_private *cm_id_priv =
3695                 container_of(cm_id, struct cm_id_private, id);
3696         unsigned long flags;
3697         int ret;
3698
3699         spin_lock_irqsave(&cm_id_priv->lock, flags);
3700         ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3701         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3702         return ret;
3703 }
3704 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3705
3706 static void cm_format_sidr_rep_event(struct cm_work *work,
3707                                      const struct cm_id_private *cm_id_priv)
3708 {
3709         struct cm_sidr_rep_msg *sidr_rep_msg;
3710         struct ib_cm_sidr_rep_event_param *param;
3711
3712         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3713                                 work->mad_recv_wc->recv_buf.mad;
3714         param = &work->cm_event.param.sidr_rep_rcvd;
3715         param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3716         param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3717         param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3718         param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3719                                       sidr_rep_msg);
3720         param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3721                                   sidr_rep_msg);
3722         param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3723         work->cm_event.private_data =
3724                 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3725 }
3726
3727 static int cm_sidr_rep_handler(struct cm_work *work)
3728 {
3729         struct cm_sidr_rep_msg *sidr_rep_msg;
3730         struct cm_id_private *cm_id_priv;
3731
3732         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3733                                 work->mad_recv_wc->recv_buf.mad;
3734         cm_id_priv = cm_acquire_id(
3735                 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3736         if (!cm_id_priv)
3737                 return -EINVAL; /* Unmatched reply. */
3738
3739         spin_lock_irq(&cm_id_priv->lock);
3740         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3741                 spin_unlock_irq(&cm_id_priv->lock);
3742                 goto out;
3743         }
3744         cm_id_priv->id.state = IB_CM_IDLE;
3745         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3746         spin_unlock_irq(&cm_id_priv->lock);
3747
3748         cm_format_sidr_rep_event(work, cm_id_priv);
3749         cm_process_work(cm_id_priv, work);
3750         return 0;
3751 out:
3752         cm_deref_id(cm_id_priv);
3753         return -EINVAL;
3754 }
3755
3756 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3757                                   enum ib_wc_status wc_status)
3758 {
3759         struct cm_id_private *cm_id_priv;
3760         struct ib_cm_event cm_event;
3761         enum ib_cm_state state;
3762         int ret;
3763
3764         memset(&cm_event, 0, sizeof cm_event);
3765         cm_id_priv = msg->context[0];
3766
3767         /* Discard old sends or ones without a response. */
3768         spin_lock_irq(&cm_id_priv->lock);
3769         state = (enum ib_cm_state) (unsigned long) msg->context[1];
3770         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3771                 goto discard;
3772
3773         trace_icm_mad_send_err(state, wc_status);
3774         switch (state) {
3775         case IB_CM_REQ_SENT:
3776         case IB_CM_MRA_REQ_RCVD:
3777                 cm_reset_to_idle(cm_id_priv);
3778                 cm_event.event = IB_CM_REQ_ERROR;
3779                 break;
3780         case IB_CM_REP_SENT:
3781         case IB_CM_MRA_REP_RCVD:
3782                 cm_reset_to_idle(cm_id_priv);
3783                 cm_event.event = IB_CM_REP_ERROR;
3784                 break;
3785         case IB_CM_DREQ_SENT:
3786                 cm_enter_timewait(cm_id_priv);
3787                 cm_event.event = IB_CM_DREQ_ERROR;
3788                 break;
3789         case IB_CM_SIDR_REQ_SENT:
3790                 cm_id_priv->id.state = IB_CM_IDLE;
3791                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3792                 break;
3793         default:
3794                 goto discard;
3795         }
3796         spin_unlock_irq(&cm_id_priv->lock);
3797         cm_event.param.send_status = wc_status;
3798
3799         /* No other events can occur on the cm_id at this point. */
3800         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3801         cm_free_msg(msg);
3802         if (ret)
3803                 ib_destroy_cm_id(&cm_id_priv->id);
3804         return;
3805 discard:
3806         spin_unlock_irq(&cm_id_priv->lock);
3807         cm_free_msg(msg);
3808 }
3809
3810 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3811                             struct ib_mad_send_wc *mad_send_wc)
3812 {
3813         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3814         struct cm_port *port;
3815         u16 attr_index;
3816
3817         port = mad_agent->context;
3818         attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3819                                   msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3820
3821         /*
3822          * If the send was in response to a received message (context[0] is not
3823          * set to a cm_id), and is not a REJ, then it is a send that was
3824          * manually retried.
3825          */
3826         if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3827                 msg->retries = 1;
3828
3829         atomic_long_add(1 + msg->retries,
3830                         &port->counter_group[CM_XMIT].counter[attr_index]);
3831         if (msg->retries)
3832                 atomic_long_add(msg->retries,
3833                                 &port->counter_group[CM_XMIT_RETRIES].
3834                                 counter[attr_index]);
3835
3836         switch (mad_send_wc->status) {
3837         case IB_WC_SUCCESS:
3838         case IB_WC_WR_FLUSH_ERR:
3839                 cm_free_msg(msg);
3840                 break;
3841         default:
3842                 if (msg->context[0] && msg->context[1])
3843                         cm_process_send_error(msg, mad_send_wc->status);
3844                 else
3845                         cm_free_msg(msg);
3846                 break;
3847         }
3848 }
3849
3850 static void cm_work_handler(struct work_struct *_work)
3851 {
3852         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3853         int ret;
3854
3855         switch (work->cm_event.event) {
3856         case IB_CM_REQ_RECEIVED:
3857                 ret = cm_req_handler(work);
3858                 break;
3859         case IB_CM_MRA_RECEIVED:
3860                 ret = cm_mra_handler(work);
3861                 break;
3862         case IB_CM_REJ_RECEIVED:
3863                 ret = cm_rej_handler(work);
3864                 break;
3865         case IB_CM_REP_RECEIVED:
3866                 ret = cm_rep_handler(work);
3867                 break;
3868         case IB_CM_RTU_RECEIVED:
3869                 ret = cm_rtu_handler(work);
3870                 break;
3871         case IB_CM_USER_ESTABLISHED:
3872                 ret = cm_establish_handler(work);
3873                 break;
3874         case IB_CM_DREQ_RECEIVED:
3875                 ret = cm_dreq_handler(work);
3876                 break;
3877         case IB_CM_DREP_RECEIVED:
3878                 ret = cm_drep_handler(work);
3879                 break;
3880         case IB_CM_SIDR_REQ_RECEIVED:
3881                 ret = cm_sidr_req_handler(work);
3882                 break;
3883         case IB_CM_SIDR_REP_RECEIVED:
3884                 ret = cm_sidr_rep_handler(work);
3885                 break;
3886         case IB_CM_LAP_RECEIVED:
3887                 ret = cm_lap_handler(work);
3888                 break;
3889         case IB_CM_APR_RECEIVED:
3890                 ret = cm_apr_handler(work);
3891                 break;
3892         case IB_CM_TIMEWAIT_EXIT:
3893                 ret = cm_timewait_handler(work);
3894                 break;
3895         default:
3896                 trace_icm_handler_err(work->cm_event.event);
3897                 ret = -EINVAL;
3898                 break;
3899         }
3900         if (ret)
3901                 cm_free_work(work);
3902 }
3903
3904 static int cm_establish(struct ib_cm_id *cm_id)
3905 {
3906         struct cm_id_private *cm_id_priv;
3907         struct cm_work *work;
3908         unsigned long flags;
3909         int ret = 0;
3910         struct cm_device *cm_dev;
3911
3912         cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3913         if (!cm_dev)
3914                 return -ENODEV;
3915
3916         work = kmalloc(sizeof *work, GFP_ATOMIC);
3917         if (!work)
3918                 return -ENOMEM;
3919
3920         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3921         spin_lock_irqsave(&cm_id_priv->lock, flags);
3922         switch (cm_id->state)
3923         {
3924         case IB_CM_REP_SENT:
3925         case IB_CM_MRA_REP_RCVD:
3926                 cm_id->state = IB_CM_ESTABLISHED;
3927                 break;
3928         case IB_CM_ESTABLISHED:
3929                 ret = -EISCONN;
3930                 break;
3931         default:
3932                 trace_icm_establish_err(cm_id);
3933                 ret = -EINVAL;
3934                 break;
3935         }
3936         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3937
3938         if (ret) {
3939                 kfree(work);
3940                 goto out;
3941         }
3942
3943         /*
3944          * The CM worker thread may try to destroy the cm_id before it
3945          * can execute this work item.  To prevent potential deadlock,
3946          * we need to find the cm_id once we're in the context of the
3947          * worker thread, rather than holding a reference on it.
3948          */
3949         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3950         work->local_id = cm_id->local_id;
3951         work->remote_id = cm_id->remote_id;
3952         work->mad_recv_wc = NULL;
3953         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3954
3955         /* Check if the device started its remove_one */
3956         spin_lock_irqsave(&cm.lock, flags);
3957         if (!cm_dev->going_down) {
3958                 queue_delayed_work(cm.wq, &work->work, 0);
3959         } else {
3960                 kfree(work);
3961                 ret = -ENODEV;
3962         }
3963         spin_unlock_irqrestore(&cm.lock, flags);
3964
3965 out:
3966         return ret;
3967 }
3968
3969 static int cm_migrate(struct ib_cm_id *cm_id)
3970 {
3971         struct cm_id_private *cm_id_priv;
3972         struct cm_av tmp_av;
3973         unsigned long flags;
3974         int tmp_send_port_not_ready;
3975         int ret = 0;
3976
3977         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3978         spin_lock_irqsave(&cm_id_priv->lock, flags);
3979         if (cm_id->state == IB_CM_ESTABLISHED &&
3980             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3981              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3982                 cm_id->lap_state = IB_CM_LAP_IDLE;
3983                 /* Swap address vector */
3984                 tmp_av = cm_id_priv->av;
3985                 cm_id_priv->av = cm_id_priv->alt_av;
3986                 cm_id_priv->alt_av = tmp_av;
3987                 /* Swap port send ready state */
3988                 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3989                 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3990                 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3991         } else
3992                 ret = -EINVAL;
3993         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3994
3995         return ret;
3996 }
3997
3998 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3999 {
4000         int ret;
4001
4002         switch (event) {
4003         case IB_EVENT_COMM_EST:
4004                 ret = cm_establish(cm_id);
4005                 break;
4006         case IB_EVENT_PATH_MIG:
4007                 ret = cm_migrate(cm_id);
4008                 break;
4009         default:
4010                 ret = -EINVAL;
4011         }
4012         return ret;
4013 }
4014 EXPORT_SYMBOL(ib_cm_notify);
4015
4016 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
4017                             struct ib_mad_send_buf *send_buf,
4018                             struct ib_mad_recv_wc *mad_recv_wc)
4019 {
4020         struct cm_port *port = mad_agent->context;
4021         struct cm_work *work;
4022         enum ib_cm_event_type event;
4023         bool alt_path = false;
4024         u16 attr_id;
4025         int paths = 0;
4026         int going_down = 0;
4027
4028         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4029         case CM_REQ_ATTR_ID:
4030                 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4031                                                 mad_recv_wc->recv_buf.mad);
4032                 paths = 1 + (alt_path != 0);
4033                 event = IB_CM_REQ_RECEIVED;
4034                 break;
4035         case CM_MRA_ATTR_ID:
4036                 event = IB_CM_MRA_RECEIVED;
4037                 break;
4038         case CM_REJ_ATTR_ID:
4039                 event = IB_CM_REJ_RECEIVED;
4040                 break;
4041         case CM_REP_ATTR_ID:
4042                 event = IB_CM_REP_RECEIVED;
4043                 break;
4044         case CM_RTU_ATTR_ID:
4045                 event = IB_CM_RTU_RECEIVED;
4046                 break;
4047         case CM_DREQ_ATTR_ID:
4048                 event = IB_CM_DREQ_RECEIVED;
4049                 break;
4050         case CM_DREP_ATTR_ID:
4051                 event = IB_CM_DREP_RECEIVED;
4052                 break;
4053         case CM_SIDR_REQ_ATTR_ID:
4054                 event = IB_CM_SIDR_REQ_RECEIVED;
4055                 break;
4056         case CM_SIDR_REP_ATTR_ID:
4057                 event = IB_CM_SIDR_REP_RECEIVED;
4058                 break;
4059         case CM_LAP_ATTR_ID:
4060                 paths = 1;
4061                 event = IB_CM_LAP_RECEIVED;
4062                 break;
4063         case CM_APR_ATTR_ID:
4064                 event = IB_CM_APR_RECEIVED;
4065                 break;
4066         default:
4067                 ib_free_recv_mad(mad_recv_wc);
4068                 return;
4069         }
4070
4071         attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4072         atomic_long_inc(&port->counter_group[CM_RECV].
4073                         counter[attr_id - CM_ATTR_ID_OFFSET]);
4074
4075         work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4076         if (!work) {
4077                 ib_free_recv_mad(mad_recv_wc);
4078                 return;
4079         }
4080
4081         INIT_DELAYED_WORK(&work->work, cm_work_handler);
4082         work->cm_event.event = event;
4083         work->mad_recv_wc = mad_recv_wc;
4084         work->port = port;
4085
4086         /* Check if the device started its remove_one */
4087         spin_lock_irq(&cm.lock);
4088         if (!port->cm_dev->going_down)
4089                 queue_delayed_work(cm.wq, &work->work, 0);
4090         else
4091                 going_down = 1;
4092         spin_unlock_irq(&cm.lock);
4093
4094         if (going_down) {
4095                 kfree(work);
4096                 ib_free_recv_mad(mad_recv_wc);
4097         }
4098 }
4099
4100 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4101                                 struct ib_qp_attr *qp_attr,
4102                                 int *qp_attr_mask)
4103 {
4104         unsigned long flags;
4105         int ret;
4106
4107         spin_lock_irqsave(&cm_id_priv->lock, flags);
4108         switch (cm_id_priv->id.state) {
4109         case IB_CM_REQ_SENT:
4110         case IB_CM_MRA_REQ_RCVD:
4111         case IB_CM_REQ_RCVD:
4112         case IB_CM_MRA_REQ_SENT:
4113         case IB_CM_REP_RCVD:
4114         case IB_CM_MRA_REP_SENT:
4115         case IB_CM_REP_SENT:
4116         case IB_CM_MRA_REP_RCVD:
4117         case IB_CM_ESTABLISHED:
4118                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4119                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
4120                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4121                 if (cm_id_priv->responder_resources)
4122                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4123                                                     IB_ACCESS_REMOTE_ATOMIC;
4124                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4125                 qp_attr->port_num = cm_id_priv->av.port->port_num;
4126                 ret = 0;
4127                 break;
4128         default:
4129                 trace_icm_qp_init_err(&cm_id_priv->id);
4130                 ret = -EINVAL;
4131                 break;
4132         }
4133         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4134         return ret;
4135 }
4136
4137 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4138                                struct ib_qp_attr *qp_attr,
4139                                int *qp_attr_mask)
4140 {
4141         unsigned long flags;
4142         int ret;
4143
4144         spin_lock_irqsave(&cm_id_priv->lock, flags);
4145         switch (cm_id_priv->id.state) {
4146         case IB_CM_REQ_RCVD:
4147         case IB_CM_MRA_REQ_SENT:
4148         case IB_CM_REP_RCVD:
4149         case IB_CM_MRA_REP_SENT:
4150         case IB_CM_REP_SENT:
4151         case IB_CM_MRA_REP_RCVD:
4152         case IB_CM_ESTABLISHED:
4153                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4154                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4155                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4156                 qp_attr->path_mtu = cm_id_priv->path_mtu;
4157                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4158                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4159                 if (cm_id_priv->qp_type == IB_QPT_RC ||
4160                     cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4161                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4162                                          IB_QP_MIN_RNR_TIMER;
4163                         qp_attr->max_dest_rd_atomic =
4164                                         cm_id_priv->responder_resources;
4165                         qp_attr->min_rnr_timer = 0;
4166                 }
4167                 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4168                         *qp_attr_mask |= IB_QP_ALT_PATH;
4169                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4170                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4171                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4172                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4173                 }
4174                 ret = 0;
4175                 break;
4176         default:
4177                 trace_icm_qp_rtr_err(&cm_id_priv->id);
4178                 ret = -EINVAL;
4179                 break;
4180         }
4181         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4182         return ret;
4183 }
4184
4185 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4186                                struct ib_qp_attr *qp_attr,
4187                                int *qp_attr_mask)
4188 {
4189         unsigned long flags;
4190         int ret;
4191
4192         spin_lock_irqsave(&cm_id_priv->lock, flags);
4193         switch (cm_id_priv->id.state) {
4194         /* Allow transition to RTS before sending REP */
4195         case IB_CM_REQ_RCVD:
4196         case IB_CM_MRA_REQ_SENT:
4197
4198         case IB_CM_REP_RCVD:
4199         case IB_CM_MRA_REP_SENT:
4200         case IB_CM_REP_SENT:
4201         case IB_CM_MRA_REP_RCVD:
4202         case IB_CM_ESTABLISHED:
4203                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4204                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4205                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4206                         switch (cm_id_priv->qp_type) {
4207                         case IB_QPT_RC:
4208                         case IB_QPT_XRC_INI:
4209                                 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4210                                                  IB_QP_MAX_QP_RD_ATOMIC;
4211                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
4212                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4213                                 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4214                                 fallthrough;
4215                         case IB_QPT_XRC_TGT:
4216                                 *qp_attr_mask |= IB_QP_TIMEOUT;
4217                                 qp_attr->timeout = cm_id_priv->av.timeout;
4218                                 break;
4219                         default:
4220                                 break;
4221                         }
4222                         if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4223                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4224                                 qp_attr->path_mig_state = IB_MIG_REARM;
4225                         }
4226                 } else {
4227                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4228                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4229                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4230                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4231                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4232                         qp_attr->path_mig_state = IB_MIG_REARM;
4233                 }
4234                 ret = 0;
4235                 break;
4236         default:
4237                 trace_icm_qp_rts_err(&cm_id_priv->id);
4238                 ret = -EINVAL;
4239                 break;
4240         }
4241         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4242         return ret;
4243 }
4244
4245 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4246                        struct ib_qp_attr *qp_attr,
4247                        int *qp_attr_mask)
4248 {
4249         struct cm_id_private *cm_id_priv;
4250         int ret;
4251
4252         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4253         switch (qp_attr->qp_state) {
4254         case IB_QPS_INIT:
4255                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4256                 break;
4257         case IB_QPS_RTR:
4258                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4259                 break;
4260         case IB_QPS_RTS:
4261                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4262                 break;
4263         default:
4264                 ret = -EINVAL;
4265                 break;
4266         }
4267         return ret;
4268 }
4269 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4270
4271 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4272                                char *buf)
4273 {
4274         struct cm_counter_group *group;
4275         struct cm_counter_attribute *cm_attr;
4276
4277         group = container_of(obj, struct cm_counter_group, obj);
4278         cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4279
4280         return sprintf(buf, "%ld\n",
4281                        atomic_long_read(&group->counter[cm_attr->index]));
4282 }
4283
4284 static const struct sysfs_ops cm_counter_ops = {
4285         .show = cm_show_counter
4286 };
4287
4288 static struct kobj_type cm_counter_obj_type = {
4289         .sysfs_ops = &cm_counter_ops,
4290         .default_attrs = cm_counter_default_attrs
4291 };
4292
4293 static int cm_create_port_fs(struct cm_port *port)
4294 {
4295         int i, ret;
4296
4297         for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4298                 ret = ib_port_register_module_stat(port->cm_dev->ib_device,
4299                                                    port->port_num,
4300                                                    &port->counter_group[i].obj,
4301                                                    &cm_counter_obj_type,
4302                                                    counter_group_names[i]);
4303                 if (ret)
4304                         goto error;
4305         }
4306
4307         return 0;
4308
4309 error:
4310         while (i--)
4311                 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4312         return ret;
4313
4314 }
4315
4316 static void cm_remove_port_fs(struct cm_port *port)
4317 {
4318         int i;
4319
4320         for (i = 0; i < CM_COUNTER_GROUPS; i++)
4321                 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4322
4323 }
4324
4325 static int cm_add_one(struct ib_device *ib_device)
4326 {
4327         struct cm_device *cm_dev;
4328         struct cm_port *port;
4329         struct ib_mad_reg_req reg_req = {
4330                 .mgmt_class = IB_MGMT_CLASS_CM,
4331                 .mgmt_class_version = IB_CM_CLASS_VERSION,
4332         };
4333         struct ib_port_modify port_modify = {
4334                 .set_port_cap_mask = IB_PORT_CM_SUP
4335         };
4336         unsigned long flags;
4337         int ret;
4338         int count = 0;
4339         unsigned int i;
4340
4341         cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4342                          GFP_KERNEL);
4343         if (!cm_dev)
4344                 return -ENOMEM;
4345
4346         cm_dev->ib_device = ib_device;
4347         cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4348         cm_dev->going_down = 0;
4349
4350         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4351         rdma_for_each_port (ib_device, i) {
4352                 if (!rdma_cap_ib_cm(ib_device, i))
4353                         continue;
4354
4355                 port = kzalloc(sizeof *port, GFP_KERNEL);
4356                 if (!port) {
4357                         ret = -ENOMEM;
4358                         goto error1;
4359                 }
4360
4361                 cm_dev->port[i-1] = port;
4362                 port->cm_dev = cm_dev;
4363                 port->port_num = i;
4364
4365                 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4366                 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4367
4368                 ret = cm_create_port_fs(port);
4369                 if (ret)
4370                         goto error1;
4371
4372                 port->mad_agent = ib_register_mad_agent(ib_device, i,
4373                                                         IB_QPT_GSI,
4374                                                         &reg_req,
4375                                                         0,
4376                                                         cm_send_handler,
4377                                                         cm_recv_handler,
4378                                                         port,
4379                                                         0);
4380                 if (IS_ERR(port->mad_agent)) {
4381                         ret = PTR_ERR(port->mad_agent);
4382                         goto error2;
4383                 }
4384
4385                 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4386                 if (ret)
4387                         goto error3;
4388
4389                 count++;
4390         }
4391
4392         if (!count) {
4393                 ret = -EOPNOTSUPP;
4394                 goto free;
4395         }
4396
4397         ib_set_client_data(ib_device, &cm_client, cm_dev);
4398
4399         write_lock_irqsave(&cm.device_lock, flags);
4400         list_add_tail(&cm_dev->list, &cm.device_list);
4401         write_unlock_irqrestore(&cm.device_lock, flags);
4402         return 0;
4403
4404 error3:
4405         ib_unregister_mad_agent(port->mad_agent);
4406 error2:
4407         cm_remove_port_fs(port);
4408 error1:
4409         port_modify.set_port_cap_mask = 0;
4410         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4411         kfree(port);
4412         while (--i) {
4413                 if (!rdma_cap_ib_cm(ib_device, i))
4414                         continue;
4415
4416                 port = cm_dev->port[i-1];
4417                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4418                 ib_unregister_mad_agent(port->mad_agent);
4419                 cm_remove_port_fs(port);
4420                 kfree(port);
4421         }
4422 free:
4423         kfree(cm_dev);
4424         return ret;
4425 }
4426
4427 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4428 {
4429         struct cm_device *cm_dev = client_data;
4430         struct cm_port *port;
4431         struct cm_id_private *cm_id_priv;
4432         struct ib_mad_agent *cur_mad_agent;
4433         struct ib_port_modify port_modify = {
4434                 .clr_port_cap_mask = IB_PORT_CM_SUP
4435         };
4436         unsigned long flags;
4437         unsigned int i;
4438
4439         write_lock_irqsave(&cm.device_lock, flags);
4440         list_del(&cm_dev->list);
4441         write_unlock_irqrestore(&cm.device_lock, flags);
4442
4443         spin_lock_irq(&cm.lock);
4444         cm_dev->going_down = 1;
4445         spin_unlock_irq(&cm.lock);
4446
4447         rdma_for_each_port (ib_device, i) {
4448                 if (!rdma_cap_ib_cm(ib_device, i))
4449                         continue;
4450
4451                 port = cm_dev->port[i-1];
4452                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4453                 /* Mark all the cm_id's as not valid */
4454                 spin_lock_irq(&cm.lock);
4455                 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4456                         cm_id_priv->altr_send_port_not_ready = 1;
4457                 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4458                         cm_id_priv->prim_send_port_not_ready = 1;
4459                 spin_unlock_irq(&cm.lock);
4460                 /*
4461                  * We flush the queue here after the going_down set, this
4462                  * verify that no new works will be queued in the recv handler,
4463                  * after that we can call the unregister_mad_agent
4464                  */
4465                 flush_workqueue(cm.wq);
4466                 spin_lock_irq(&cm.state_lock);
4467                 cur_mad_agent = port->mad_agent;
4468                 port->mad_agent = NULL;
4469                 spin_unlock_irq(&cm.state_lock);
4470                 ib_unregister_mad_agent(cur_mad_agent);
4471                 cm_remove_port_fs(port);
4472                 kfree(port);
4473         }
4474
4475         kfree(cm_dev);
4476 }
4477
4478 static int __init ib_cm_init(void)
4479 {
4480         int ret;
4481
4482         INIT_LIST_HEAD(&cm.device_list);
4483         rwlock_init(&cm.device_lock);
4484         spin_lock_init(&cm.lock);
4485         spin_lock_init(&cm.state_lock);
4486         cm.listen_service_table = RB_ROOT;
4487         cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4488         cm.remote_id_table = RB_ROOT;
4489         cm.remote_qp_table = RB_ROOT;
4490         cm.remote_sidr_table = RB_ROOT;
4491         xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC);
4492         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4493         INIT_LIST_HEAD(&cm.timewait_list);
4494
4495         cm.wq = alloc_workqueue("ib_cm", 0, 1);
4496         if (!cm.wq) {
4497                 ret = -ENOMEM;
4498                 goto error2;
4499         }
4500
4501         ret = ib_register_client(&cm_client);
4502         if (ret)
4503                 goto error3;
4504
4505         return 0;
4506 error3:
4507         destroy_workqueue(cm.wq);
4508 error2:
4509         return ret;
4510 }
4511
4512 static void __exit ib_cm_cleanup(void)
4513 {
4514         struct cm_timewait_info *timewait_info, *tmp;
4515
4516         spin_lock_irq(&cm.lock);
4517         list_for_each_entry(timewait_info, &cm.timewait_list, list)
4518                 cancel_delayed_work(&timewait_info->work.work);
4519         spin_unlock_irq(&cm.lock);
4520
4521         ib_unregister_client(&cm_client);
4522         destroy_workqueue(cm.wq);
4523
4524         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4525                 list_del(&timewait_info->list);
4526                 kfree(timewait_info);
4527         }
4528
4529         WARN_ON(!xa_empty(&cm.local_id_table));
4530 }
4531
4532 module_init(ib_cm_init);
4533 module_exit(ib_cm_cleanup);