linux/drivers/infiniband/sw/siw/siw_cm.c
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   1// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2
   3/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
   4/*          Fredy Neeser */
   5/*          Greg Joyce <greg@opengridcomputing.com> */
   6/* Copyright (c) 2008-2019, IBM Corporation */
   7/* Copyright (c) 2017, Open Grid Computing, Inc. */
   8
   9#include <linux/errno.h>
  10#include <linux/types.h>
  11#include <linux/net.h>
  12#include <linux/inetdevice.h>
  13#include <net/addrconf.h>
  14#include <linux/workqueue.h>
  15#include <net/sock.h>
  16#include <net/tcp.h>
  17#include <linux/inet.h>
  18#include <linux/tcp.h>
  19
  20#include <rdma/iw_cm.h>
  21#include <rdma/ib_verbs.h>
  22#include <rdma/ib_user_verbs.h>
  23
  24#include "siw.h"
  25#include "siw_cm.h"
  26
  27/*
  28 * Set to any combination of
  29 * MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR
  30 */
  31static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR;
  32static const bool relaxed_ird_negotiation = true;
  33
  34static void siw_cm_llp_state_change(struct sock *s);
  35static void siw_cm_llp_data_ready(struct sock *s);
  36static void siw_cm_llp_write_space(struct sock *s);
  37static void siw_cm_llp_error_report(struct sock *s);
  38static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
  39                         int status);
  40
  41static void siw_sk_assign_cm_upcalls(struct sock *sk)
  42{
  43        write_lock_bh(&sk->sk_callback_lock);
  44        sk->sk_state_change = siw_cm_llp_state_change;
  45        sk->sk_data_ready = siw_cm_llp_data_ready;
  46        sk->sk_write_space = siw_cm_llp_write_space;
  47        sk->sk_error_report = siw_cm_llp_error_report;
  48        write_unlock_bh(&sk->sk_callback_lock);
  49}
  50
  51static void siw_sk_save_upcalls(struct sock *sk)
  52{
  53        struct siw_cep *cep = sk_to_cep(sk);
  54
  55        write_lock_bh(&sk->sk_callback_lock);
  56        cep->sk_state_change = sk->sk_state_change;
  57        cep->sk_data_ready = sk->sk_data_ready;
  58        cep->sk_write_space = sk->sk_write_space;
  59        cep->sk_error_report = sk->sk_error_report;
  60        write_unlock_bh(&sk->sk_callback_lock);
  61}
  62
  63static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep)
  64{
  65        sk->sk_state_change = cep->sk_state_change;
  66        sk->sk_data_ready = cep->sk_data_ready;
  67        sk->sk_write_space = cep->sk_write_space;
  68        sk->sk_error_report = cep->sk_error_report;
  69        sk->sk_user_data = NULL;
  70}
  71
  72static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp)
  73{
  74        struct socket *s = cep->sock;
  75        struct sock *sk = s->sk;
  76
  77        write_lock_bh(&sk->sk_callback_lock);
  78
  79        qp->attrs.sk = s;
  80        sk->sk_data_ready = siw_qp_llp_data_ready;
  81        sk->sk_write_space = siw_qp_llp_write_space;
  82
  83        write_unlock_bh(&sk->sk_callback_lock);
  84}
  85
  86static void siw_socket_disassoc(struct socket *s)
  87{
  88        struct sock *sk = s->sk;
  89        struct siw_cep *cep;
  90
  91        if (sk) {
  92                write_lock_bh(&sk->sk_callback_lock);
  93                cep = sk_to_cep(sk);
  94                if (cep) {
  95                        siw_sk_restore_upcalls(sk, cep);
  96                        siw_cep_put(cep);
  97                } else {
  98                        pr_warn("siw: cannot restore sk callbacks: no ep\n");
  99                }
 100                write_unlock_bh(&sk->sk_callback_lock);
 101        } else {
 102                pr_warn("siw: cannot restore sk callbacks: no sk\n");
 103        }
 104}
 105
 106static void siw_rtr_data_ready(struct sock *sk)
 107{
 108        struct siw_cep *cep;
 109        struct siw_qp *qp = NULL;
 110        read_descriptor_t rd_desc;
 111
 112        read_lock(&sk->sk_callback_lock);
 113
 114        cep = sk_to_cep(sk);
 115        if (!cep) {
 116                WARN(1, "No connection endpoint\n");
 117                goto out;
 118        }
 119        qp = sk_to_qp(sk);
 120
 121        memset(&rd_desc, 0, sizeof(rd_desc));
 122        rd_desc.arg.data = qp;
 123        rd_desc.count = 1;
 124
 125        tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
 126        /*
 127         * Check if first frame was successfully processed.
 128         * Signal connection full establishment if yes.
 129         * Failed data processing would have already scheduled
 130         * connection drop.
 131         */
 132        if (!qp->rx_stream.rx_suspend)
 133                siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
 134out:
 135        read_unlock(&sk->sk_callback_lock);
 136        if (qp)
 137                siw_qp_socket_assoc(cep, qp);
 138}
 139
 140static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep)
 141{
 142        struct sock *sk = cep->sock->sk;
 143
 144        write_lock_bh(&sk->sk_callback_lock);
 145        sk->sk_data_ready = siw_rtr_data_ready;
 146        sk->sk_write_space = siw_qp_llp_write_space;
 147        write_unlock_bh(&sk->sk_callback_lock);
 148}
 149
 150static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
 151{
 152        cep->sock = s;
 153        siw_cep_get(cep);
 154        s->sk->sk_user_data = cep;
 155
 156        siw_sk_save_upcalls(s->sk);
 157        siw_sk_assign_cm_upcalls(s->sk);
 158}
 159
 160static struct siw_cep *siw_cep_alloc(struct siw_device *sdev)
 161{
 162        struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL);
 163        unsigned long flags;
 164
 165        if (!cep)
 166                return NULL;
 167
 168        INIT_LIST_HEAD(&cep->listenq);
 169        INIT_LIST_HEAD(&cep->devq);
 170        INIT_LIST_HEAD(&cep->work_freelist);
 171
 172        kref_init(&cep->ref);
 173        cep->state = SIW_EPSTATE_IDLE;
 174        init_waitqueue_head(&cep->waitq);
 175        spin_lock_init(&cep->lock);
 176        cep->sdev = sdev;
 177        cep->enhanced_rdma_conn_est = false;
 178
 179        spin_lock_irqsave(&sdev->lock, flags);
 180        list_add_tail(&cep->devq, &sdev->cep_list);
 181        spin_unlock_irqrestore(&sdev->lock, flags);
 182
 183        siw_dbg_cep(cep, "new endpoint\n");
 184        return cep;
 185}
 186
 187static void siw_cm_free_work(struct siw_cep *cep)
 188{
 189        struct list_head *w, *tmp;
 190        struct siw_cm_work *work;
 191
 192        list_for_each_safe(w, tmp, &cep->work_freelist) {
 193                work = list_entry(w, struct siw_cm_work, list);
 194                list_del(&work->list);
 195                kfree(work);
 196        }
 197}
 198
 199static void siw_cancel_mpatimer(struct siw_cep *cep)
 200{
 201        spin_lock_bh(&cep->lock);
 202        if (cep->mpa_timer) {
 203                if (cancel_delayed_work(&cep->mpa_timer->work)) {
 204                        siw_cep_put(cep);
 205                        kfree(cep->mpa_timer); /* not needed again */
 206                }
 207                cep->mpa_timer = NULL;
 208        }
 209        spin_unlock_bh(&cep->lock);
 210}
 211
 212static void siw_put_work(struct siw_cm_work *work)
 213{
 214        INIT_LIST_HEAD(&work->list);
 215        spin_lock_bh(&work->cep->lock);
 216        list_add(&work->list, &work->cep->work_freelist);
 217        spin_unlock_bh(&work->cep->lock);
 218}
 219
 220static void siw_cep_set_inuse(struct siw_cep *cep)
 221{
 222        unsigned long flags;
 223retry:
 224        spin_lock_irqsave(&cep->lock, flags);
 225
 226        if (cep->in_use) {
 227                spin_unlock_irqrestore(&cep->lock, flags);
 228                wait_event_interruptible(cep->waitq, !cep->in_use);
 229                if (signal_pending(current))
 230                        flush_signals(current);
 231                goto retry;
 232        } else {
 233                cep->in_use = 1;
 234                spin_unlock_irqrestore(&cep->lock, flags);
 235        }
 236}
 237
 238static void siw_cep_set_free(struct siw_cep *cep)
 239{
 240        unsigned long flags;
 241
 242        spin_lock_irqsave(&cep->lock, flags);
 243        cep->in_use = 0;
 244        spin_unlock_irqrestore(&cep->lock, flags);
 245
 246        wake_up(&cep->waitq);
 247}
 248
 249static void __siw_cep_dealloc(struct kref *ref)
 250{
 251        struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
 252        struct siw_device *sdev = cep->sdev;
 253        unsigned long flags;
 254
 255        WARN_ON(cep->listen_cep);
 256
 257        /* kfree(NULL) is safe */
 258        kfree(cep->mpa.pdata);
 259        spin_lock_bh(&cep->lock);
 260        if (!list_empty(&cep->work_freelist))
 261                siw_cm_free_work(cep);
 262        spin_unlock_bh(&cep->lock);
 263
 264        spin_lock_irqsave(&sdev->lock, flags);
 265        list_del(&cep->devq);
 266        spin_unlock_irqrestore(&sdev->lock, flags);
 267
 268        siw_dbg_cep(cep, "free endpoint\n");
 269        kfree(cep);
 270}
 271
 272static struct siw_cm_work *siw_get_work(struct siw_cep *cep)
 273{
 274        struct siw_cm_work *work = NULL;
 275
 276        spin_lock_bh(&cep->lock);
 277        if (!list_empty(&cep->work_freelist)) {
 278                work = list_entry(cep->work_freelist.next, struct siw_cm_work,
 279                                  list);
 280                list_del_init(&work->list);
 281        }
 282        spin_unlock_bh(&cep->lock);
 283        return work;
 284}
 285
 286static int siw_cm_alloc_work(struct siw_cep *cep, int num)
 287{
 288        struct siw_cm_work *work;
 289
 290        while (num--) {
 291                work = kmalloc(sizeof(*work), GFP_KERNEL);
 292                if (!work) {
 293                        if (!(list_empty(&cep->work_freelist)))
 294                                siw_cm_free_work(cep);
 295                        return -ENOMEM;
 296                }
 297                work->cep = cep;
 298                INIT_LIST_HEAD(&work->list);
 299                list_add(&work->list, &cep->work_freelist);
 300        }
 301        return 0;
 302}
 303
 304/*
 305 * siw_cm_upcall()
 306 *
 307 * Upcall to IWCM to inform about async connection events
 308 */
 309static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
 310                         int status)
 311{
 312        struct iw_cm_event event;
 313        struct iw_cm_id *id;
 314
 315        memset(&event, 0, sizeof(event));
 316        event.status = status;
 317        event.event = reason;
 318
 319        if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
 320                event.provider_data = cep;
 321                id = cep->listen_cep->cm_id;
 322        } else {
 323                id = cep->cm_id;
 324        }
 325        /* Signal IRD and ORD */
 326        if (reason == IW_CM_EVENT_ESTABLISHED ||
 327            reason == IW_CM_EVENT_CONNECT_REPLY) {
 328                /* Signal negotiated IRD/ORD values we will use */
 329                event.ird = cep->ird;
 330                event.ord = cep->ord;
 331        } else if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
 332                event.ird = cep->ord;
 333                event.ord = cep->ird;
 334        }
 335        /* Signal private data and address information */
 336        if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
 337            reason == IW_CM_EVENT_CONNECT_REPLY) {
 338                u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len);
 339
 340                if (pd_len) {
 341                        /*
 342                         * hand over MPA private data
 343                         */
 344                        event.private_data_len = pd_len;
 345                        event.private_data = cep->mpa.pdata;
 346
 347                        /* Hide MPA V2 IRD/ORD control */
 348                        if (cep->enhanced_rdma_conn_est) {
 349                                event.private_data_len -=
 350                                        sizeof(struct mpa_v2_data);
 351                                event.private_data +=
 352                                        sizeof(struct mpa_v2_data);
 353                        }
 354                }
 355                getname_local(cep->sock, &event.local_addr);
 356                getname_peer(cep->sock, &event.remote_addr);
 357        }
 358        siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n",
 359                    cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status);
 360
 361        return id->event_handler(id, &event);
 362}
 363
 364/*
 365 * siw_qp_cm_drop()
 366 *
 367 * Drops established LLP connection if present and not already
 368 * scheduled for dropping. Called from user context, SQ workqueue
 369 * or receive IRQ. Caller signals if socket can be immediately
 370 * closed (basically, if not in IRQ).
 371 */
 372void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
 373{
 374        struct siw_cep *cep = qp->cep;
 375
 376        qp->rx_stream.rx_suspend = 1;
 377        qp->tx_ctx.tx_suspend = 1;
 378
 379        if (!qp->cep)
 380                return;
 381
 382        if (schedule) {
 383                siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
 384        } else {
 385                siw_cep_set_inuse(cep);
 386
 387                if (cep->state == SIW_EPSTATE_CLOSED) {
 388                        siw_dbg_cep(cep, "already closed\n");
 389                        goto out;
 390                }
 391                siw_dbg_cep(cep, "immediate close, state %d\n", cep->state);
 392
 393                if (qp->term_info.valid)
 394                        siw_send_terminate(qp);
 395
 396                if (cep->cm_id) {
 397                        switch (cep->state) {
 398                        case SIW_EPSTATE_AWAIT_MPAREP:
 399                                siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
 400                                              -EINVAL);
 401                                break;
 402
 403                        case SIW_EPSTATE_RDMA_MODE:
 404                                siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
 405                                break;
 406
 407                        case SIW_EPSTATE_IDLE:
 408                        case SIW_EPSTATE_LISTENING:
 409                        case SIW_EPSTATE_CONNECTING:
 410                        case SIW_EPSTATE_AWAIT_MPAREQ:
 411                        case SIW_EPSTATE_RECVD_MPAREQ:
 412                        case SIW_EPSTATE_CLOSED:
 413                        default:
 414                                break;
 415                        }
 416                        cep->cm_id->rem_ref(cep->cm_id);
 417                        cep->cm_id = NULL;
 418                        siw_cep_put(cep);
 419                }
 420                cep->state = SIW_EPSTATE_CLOSED;
 421
 422                if (cep->sock) {
 423                        siw_socket_disassoc(cep->sock);
 424                        /*
 425                         * Immediately close socket
 426                         */
 427                        sock_release(cep->sock);
 428                        cep->sock = NULL;
 429                }
 430                if (cep->qp) {
 431                        cep->qp = NULL;
 432                        siw_qp_put(qp);
 433                }
 434out:
 435                siw_cep_set_free(cep);
 436        }
 437}
 438
 439void siw_cep_put(struct siw_cep *cep)
 440{
 441        WARN_ON(kref_read(&cep->ref) < 1);
 442        kref_put(&cep->ref, __siw_cep_dealloc);
 443}
 444
 445void siw_cep_get(struct siw_cep *cep)
 446{
 447        kref_get(&cep->ref);
 448}
 449
 450/*
 451 * Expects params->pd_len in host byte order
 452 */
 453static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len)
 454{
 455        struct socket *s = cep->sock;
 456        struct mpa_rr *rr = &cep->mpa.hdr;
 457        struct kvec iov[3];
 458        struct msghdr msg;
 459        int rv;
 460        int iovec_num = 0;
 461        int mpa_len;
 462
 463        memset(&msg, 0, sizeof(msg));
 464
 465        iov[iovec_num].iov_base = rr;
 466        iov[iovec_num].iov_len = sizeof(*rr);
 467        mpa_len = sizeof(*rr);
 468
 469        if (cep->enhanced_rdma_conn_est) {
 470                iovec_num++;
 471                iov[iovec_num].iov_base = &cep->mpa.v2_ctrl;
 472                iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl);
 473                mpa_len += sizeof(cep->mpa.v2_ctrl);
 474        }
 475        if (pd_len) {
 476                iovec_num++;
 477                iov[iovec_num].iov_base = (char *)pdata;
 478                iov[iovec_num].iov_len = pd_len;
 479                mpa_len += pd_len;
 480        }
 481        if (cep->enhanced_rdma_conn_est)
 482                pd_len += sizeof(cep->mpa.v2_ctrl);
 483
 484        rr->params.pd_len = cpu_to_be16(pd_len);
 485
 486        rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len);
 487
 488        return rv < 0 ? rv : 0;
 489}
 490
 491/*
 492 * Receive MPA Request/Reply header.
 493 *
 494 * Returns 0 if complete MPA Request/Reply header including
 495 * eventual private data was received. Returns -EAGAIN if
 496 * header was partially received or negative error code otherwise.
 497 *
 498 * Context: May be called in process context only
 499 */
 500static int siw_recv_mpa_rr(struct siw_cep *cep)
 501{
 502        struct mpa_rr *hdr = &cep->mpa.hdr;
 503        struct socket *s = cep->sock;
 504        u16 pd_len;
 505        int rcvd, to_rcv;
 506
 507        if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) {
 508                rcvd = ksock_recv(s, (char *)hdr + cep->mpa.bytes_rcvd,
 509                                  sizeof(struct mpa_rr) - cep->mpa.bytes_rcvd,
 510                                  0);
 511                if (rcvd <= 0)
 512                        return -ECONNABORTED;
 513
 514                cep->mpa.bytes_rcvd += rcvd;
 515
 516                if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr))
 517                        return -EAGAIN;
 518
 519                if (be16_to_cpu(hdr->params.pd_len) > MPA_MAX_PRIVDATA)
 520                        return -EPROTO;
 521        }
 522        pd_len = be16_to_cpu(hdr->params.pd_len);
 523
 524        /*
 525         * At least the MPA Request/Reply header (frame not including
 526         * private data) has been received.
 527         * Receive (or continue receiving) any private data.
 528         */
 529        to_rcv = pd_len - (cep->mpa.bytes_rcvd - sizeof(struct mpa_rr));
 530
 531        if (!to_rcv) {
 532                /*
 533                 * We must have hdr->params.pd_len == 0 and thus received a
 534                 * complete MPA Request/Reply frame.
 535                 * Check against peer protocol violation.
 536                 */
 537                u32 word;
 538
 539                rcvd = ksock_recv(s, (char *)&word, sizeof(word), MSG_DONTWAIT);
 540                if (rcvd == -EAGAIN)
 541                        return 0;
 542
 543                if (rcvd == 0) {
 544                        siw_dbg_cep(cep, "peer EOF\n");
 545                        return -EPIPE;
 546                }
 547                if (rcvd < 0) {
 548                        siw_dbg_cep(cep, "error: %d\n", rcvd);
 549                        return rcvd;
 550                }
 551                siw_dbg_cep(cep, "peer sent extra data: %d\n", rcvd);
 552
 553                return -EPROTO;
 554        }
 555
 556        /*
 557         * At this point, we must have hdr->params.pd_len != 0.
 558         * A private data buffer gets allocated if hdr->params.pd_len != 0.
 559         */
 560        if (!cep->mpa.pdata) {
 561                cep->mpa.pdata = kmalloc(pd_len + 4, GFP_KERNEL);
 562                if (!cep->mpa.pdata)
 563                        return -ENOMEM;
 564        }
 565        rcvd = ksock_recv(
 566                s, cep->mpa.pdata + cep->mpa.bytes_rcvd - sizeof(struct mpa_rr),
 567                to_rcv + 4, MSG_DONTWAIT);
 568
 569        if (rcvd < 0)
 570                return rcvd;
 571
 572        if (rcvd > to_rcv)
 573                return -EPROTO;
 574
 575        cep->mpa.bytes_rcvd += rcvd;
 576
 577        if (to_rcv == rcvd) {
 578                siw_dbg_cep(cep, "%d bytes private data received\n", pd_len);
 579                return 0;
 580        }
 581        return -EAGAIN;
 582}
 583
 584/*
 585 * siw_proc_mpareq()
 586 *
 587 * Read MPA Request from socket and signal new connection to IWCM
 588 * if success. Caller must hold lock on corresponding listening CEP.
 589 */
 590static int siw_proc_mpareq(struct siw_cep *cep)
 591{
 592        struct mpa_rr *req;
 593        int version, rv;
 594        u16 pd_len;
 595
 596        rv = siw_recv_mpa_rr(cep);
 597        if (rv)
 598                return rv;
 599
 600        req = &cep->mpa.hdr;
 601
 602        version = __mpa_rr_revision(req->params.bits);
 603        pd_len = be16_to_cpu(req->params.pd_len);
 604
 605        if (version > MPA_REVISION_2)
 606                /* allow for 0, 1, and 2 only */
 607                return -EPROTO;
 608
 609        if (memcmp(req->key, MPA_KEY_REQ, 16))
 610                return -EPROTO;
 611
 612        /* Prepare for sending MPA reply */
 613        memcpy(req->key, MPA_KEY_REP, 16);
 614
 615        if (version == MPA_REVISION_2 &&
 616            (req->params.bits & MPA_RR_FLAG_ENHANCED)) {
 617                /*
 618                 * MPA version 2 must signal IRD/ORD values and P2P mode
 619                 * in private data if header flag MPA_RR_FLAG_ENHANCED
 620                 * is set.
 621                 */
 622                if (pd_len < sizeof(struct mpa_v2_data))
 623                        goto reject_conn;
 624
 625                cep->enhanced_rdma_conn_est = true;
 626        }
 627
 628        /* MPA Markers: currently not supported. Marker TX to be added. */
 629        if (req->params.bits & MPA_RR_FLAG_MARKERS)
 630                goto reject_conn;
 631
 632        if (req->params.bits & MPA_RR_FLAG_CRC) {
 633                /*
 634                 * RFC 5044, page 27: CRC MUST be used if peer requests it.
 635                 * siw specific: 'mpa_crc_strict' parameter to reject
 636                 * connection with CRC if local CRC off enforced by
 637                 * 'mpa_crc_strict' module parameter.
 638                 */
 639                if (!mpa_crc_required && mpa_crc_strict)
 640                        goto reject_conn;
 641
 642                /* Enable CRC if requested by module parameter */
 643                if (mpa_crc_required)
 644                        req->params.bits |= MPA_RR_FLAG_CRC;
 645        }
 646        if (cep->enhanced_rdma_conn_est) {
 647                struct mpa_v2_data *v2 = (struct mpa_v2_data *)cep->mpa.pdata;
 648
 649                /*
 650                 * Peer requested ORD becomes requested local IRD,
 651                 * peer requested IRD becomes requested local ORD.
 652                 * IRD and ORD get limited by global maximum values.
 653                 */
 654                cep->ord = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
 655                cep->ord = min(cep->ord, SIW_MAX_ORD_QP);
 656                cep->ird = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
 657                cep->ird = min(cep->ird, SIW_MAX_IRD_QP);
 658
 659                /* May get overwritten by locally negotiated values */
 660                cep->mpa.v2_ctrl.ird = htons(cep->ird);
 661                cep->mpa.v2_ctrl.ord = htons(cep->ord);
 662
 663                /*
 664                 * Support for peer sent zero length Write or Read to
 665                 * let local side enter RTS. Writes are preferred.
 666                 * Sends would require pre-posting a Receive and are
 667                 * not supported.
 668                 * Propose zero length Write if none of Read and Write
 669                 * is indicated.
 670                 */
 671                if (v2->ird & MPA_V2_PEER_TO_PEER) {
 672                        cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
 673
 674                        if (v2->ord & MPA_V2_RDMA_WRITE_RTR)
 675                                cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
 676                        else if (v2->ord & MPA_V2_RDMA_READ_RTR)
 677                                cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_READ_RTR;
 678                        else
 679                                cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
 680                }
 681        }
 682
 683        cep->state = SIW_EPSTATE_RECVD_MPAREQ;
 684
 685        /* Keep reference until IWCM accepts/rejects */
 686        siw_cep_get(cep);
 687        rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST, 0);
 688        if (rv)
 689                siw_cep_put(cep);
 690
 691        return rv;
 692
 693reject_conn:
 694        siw_dbg_cep(cep, "reject: crc %d:%d:%d, m %d:%d\n",
 695                    req->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
 696                    mpa_crc_required, mpa_crc_strict,
 697                    req->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
 698
 699        req->params.bits &= ~MPA_RR_FLAG_MARKERS;
 700        req->params.bits |= MPA_RR_FLAG_REJECT;
 701
 702        if (!mpa_crc_required && mpa_crc_strict)
 703                req->params.bits &= ~MPA_RR_FLAG_CRC;
 704
 705        if (pd_len)
 706                kfree(cep->mpa.pdata);
 707
 708        cep->mpa.pdata = NULL;
 709
 710        siw_send_mpareqrep(cep, NULL, 0);
 711
 712        return -EOPNOTSUPP;
 713}
 714
 715static int siw_proc_mpareply(struct siw_cep *cep)
 716{
 717        struct siw_qp_attrs qp_attrs;
 718        enum siw_qp_attr_mask qp_attr_mask;
 719        struct siw_qp *qp = cep->qp;
 720        struct mpa_rr *rep;
 721        int rv;
 722        u16 rep_ord;
 723        u16 rep_ird;
 724        bool ird_insufficient = false;
 725        enum mpa_v2_ctrl mpa_p2p_mode = MPA_V2_RDMA_NO_RTR;
 726
 727        rv = siw_recv_mpa_rr(cep);
 728        if (rv != -EAGAIN)
 729                siw_cancel_mpatimer(cep);
 730        if (rv)
 731                goto out_err;
 732
 733        rep = &cep->mpa.hdr;
 734
 735        if (__mpa_rr_revision(rep->params.bits) > MPA_REVISION_2) {
 736                /* allow for 0, 1,  and 2 only */
 737                rv = -EPROTO;
 738                goto out_err;
 739        }
 740        if (memcmp(rep->key, MPA_KEY_REP, 16)) {
 741                siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, LLP_ETYPE_MPA,
 742                                   LLP_ECODE_INVALID_REQ_RESP, 0);
 743                siw_send_terminate(qp);
 744                rv = -EPROTO;
 745                goto out_err;
 746        }
 747        if (rep->params.bits & MPA_RR_FLAG_REJECT) {
 748                siw_dbg_cep(cep, "got mpa reject\n");
 749                siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNRESET);
 750
 751                return -ECONNRESET;
 752        }
 753        if (try_gso && rep->params.bits & MPA_RR_FLAG_GSO_EXP) {
 754                siw_dbg_cep(cep, "peer allows GSO on TX\n");
 755                qp->tx_ctx.gso_seg_limit = 0;
 756        }
 757        if ((rep->params.bits & MPA_RR_FLAG_MARKERS) ||
 758            (mpa_crc_required && !(rep->params.bits & MPA_RR_FLAG_CRC)) ||
 759            (mpa_crc_strict && !mpa_crc_required &&
 760             (rep->params.bits & MPA_RR_FLAG_CRC))) {
 761                siw_dbg_cep(cep, "reply unsupp: crc %d:%d:%d, m %d:%d\n",
 762                            rep->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
 763                            mpa_crc_required, mpa_crc_strict,
 764                            rep->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
 765
 766                siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNREFUSED);
 767
 768                return -EINVAL;
 769        }
 770        if (cep->enhanced_rdma_conn_est) {
 771                struct mpa_v2_data *v2;
 772
 773                if (__mpa_rr_revision(rep->params.bits) < MPA_REVISION_2 ||
 774                    !(rep->params.bits & MPA_RR_FLAG_ENHANCED)) {
 775                        /*
 776                         * Protocol failure: The responder MUST reply with
 777                         * MPA version 2 and MUST set MPA_RR_FLAG_ENHANCED.
 778                         */
 779                        siw_dbg_cep(cep, "mpa reply error: vers %d, enhcd %d\n",
 780                                    __mpa_rr_revision(rep->params.bits),
 781                                    rep->params.bits & MPA_RR_FLAG_ENHANCED ?
 782                                            1 :
 783                                            0);
 784
 785                        siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
 786                                      -ECONNRESET);
 787                        return -EINVAL;
 788                }
 789                v2 = (struct mpa_v2_data *)cep->mpa.pdata;
 790                rep_ird = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
 791                rep_ord = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
 792
 793                if (cep->ird < rep_ord &&
 794                    (relaxed_ird_negotiation == false ||
 795                     rep_ord > cep->sdev->attrs.max_ird)) {
 796                        siw_dbg_cep(cep, "ird %d, rep_ord %d, max_ord %d\n",
 797                                    cep->ird, rep_ord,
 798                                    cep->sdev->attrs.max_ord);
 799                        ird_insufficient = true;
 800                }
 801                if (cep->ord > rep_ird && relaxed_ird_negotiation == false) {
 802                        siw_dbg_cep(cep, "ord %d, rep_ird %d\n", cep->ord,
 803                                    rep_ird);
 804                        ird_insufficient = true;
 805                }
 806                /*
 807                 * Always report negotiated peer values to user,
 808                 * even if IRD/ORD negotiation failed
 809                 */
 810                cep->ird = rep_ord;
 811                cep->ord = rep_ird;
 812
 813                if (ird_insufficient) {
 814                        /*
 815                         * If the initiator IRD is insuffient for the
 816                         * responder ORD, send a TERM.
 817                         */
 818                        siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
 819                                           LLP_ETYPE_MPA,
 820                                           LLP_ECODE_INSUFFICIENT_IRD, 0);
 821                        siw_send_terminate(qp);
 822                        rv = -ENOMEM;
 823                        goto out_err;
 824                }
 825                if (cep->mpa.v2_ctrl_req.ird & MPA_V2_PEER_TO_PEER)
 826                        mpa_p2p_mode =
 827                                cep->mpa.v2_ctrl_req.ord &
 828                                (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR);
 829
 830                /*
 831                 * Check if we requested P2P mode, and if peer agrees
 832                 */
 833                if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
 834                        if ((mpa_p2p_mode & v2->ord) == 0) {
 835                                /*
 836                                 * We requested RTR mode(s), but the peer
 837                                 * did not pick any mode we support.
 838                                 */
 839                                siw_dbg_cep(cep,
 840                                            "rtr mode:  req %2x, got %2x\n",
 841                                            mpa_p2p_mode,
 842                                            v2->ord & (MPA_V2_RDMA_WRITE_RTR |
 843                                                       MPA_V2_RDMA_READ_RTR));
 844
 845                                siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
 846                                                   LLP_ETYPE_MPA,
 847                                                   LLP_ECODE_NO_MATCHING_RTR,
 848                                                   0);
 849                                siw_send_terminate(qp);
 850                                rv = -EPROTO;
 851                                goto out_err;
 852                        }
 853                        mpa_p2p_mode = v2->ord & (MPA_V2_RDMA_WRITE_RTR |
 854                                                  MPA_V2_RDMA_READ_RTR);
 855                }
 856        }
 857        memset(&qp_attrs, 0, sizeof(qp_attrs));
 858
 859        if (rep->params.bits & MPA_RR_FLAG_CRC)
 860                qp_attrs.flags = SIW_MPA_CRC;
 861
 862        qp_attrs.irq_size = cep->ird;
 863        qp_attrs.orq_size = cep->ord;
 864        qp_attrs.sk = cep->sock;
 865        qp_attrs.state = SIW_QP_STATE_RTS;
 866
 867        qp_attr_mask = SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
 868                       SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | SIW_QP_ATTR_MPA;
 869
 870        /* Move socket RX/TX under QP control */
 871        down_write(&qp->state_lock);
 872        if (qp->attrs.state > SIW_QP_STATE_RTR) {
 873                rv = -EINVAL;
 874                up_write(&qp->state_lock);
 875                goto out_err;
 876        }
 877        rv = siw_qp_modify(qp, &qp_attrs, qp_attr_mask);
 878
 879        siw_qp_socket_assoc(cep, qp);
 880
 881        up_write(&qp->state_lock);
 882
 883        /* Send extra RDMA frame to trigger peer RTS if negotiated */
 884        if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
 885                rv = siw_qp_mpa_rts(qp, mpa_p2p_mode);
 886                if (rv)
 887                        goto out_err;
 888        }
 889        if (!rv) {
 890                rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 0);
 891                if (!rv)
 892                        cep->state = SIW_EPSTATE_RDMA_MODE;
 893
 894                return 0;
 895        }
 896
 897out_err:
 898        siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL);
 899
 900        return rv;
 901}
 902
 903/*
 904 * siw_accept_newconn - accept an incoming pending connection
 905 *
 906 */
 907static void siw_accept_newconn(struct siw_cep *cep)
 908{
 909        struct socket *s = cep->sock;
 910        struct socket *new_s = NULL;
 911        struct siw_cep *new_cep = NULL;
 912        int rv = 0; /* debug only. should disappear */
 913
 914        if (cep->state != SIW_EPSTATE_LISTENING)
 915                goto error;
 916
 917        new_cep = siw_cep_alloc(cep->sdev);
 918        if (!new_cep)
 919                goto error;
 920
 921        /*
 922         * 4: Allocate a sufficient number of work elements
 923         * to allow concurrent handling of local + peer close
 924         * events, MPA header processing + MPA timeout.
 925         */
 926        if (siw_cm_alloc_work(new_cep, 4) != 0)
 927                goto error;
 928
 929        /*
 930         * Copy saved socket callbacks from listening CEP
 931         * and assign new socket with new CEP
 932         */
 933        new_cep->sk_state_change = cep->sk_state_change;
 934        new_cep->sk_data_ready = cep->sk_data_ready;
 935        new_cep->sk_write_space = cep->sk_write_space;
 936        new_cep->sk_error_report = cep->sk_error_report;
 937
 938        rv = kernel_accept(s, &new_s, O_NONBLOCK);
 939        if (rv != 0) {
 940                /*
 941                 * Connection already aborted by peer..?
 942                 */
 943                siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv);
 944                goto error;
 945        }
 946        new_cep->sock = new_s;
 947        siw_cep_get(new_cep);
 948        new_s->sk->sk_user_data = new_cep;
 949
 950        if (siw_tcp_nagle == false)
 951                tcp_sock_set_nodelay(new_s->sk);
 952        new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ;
 953
 954        rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT);
 955        if (rv)
 956                goto error;
 957        /*
 958         * See siw_proc_mpareq() etc. for the use of new_cep->listen_cep.
 959         */
 960        new_cep->listen_cep = cep;
 961        siw_cep_get(cep);
 962
 963        if (atomic_read(&new_s->sk->sk_rmem_alloc)) {
 964                /*
 965                 * MPA REQ already queued
 966                 */
 967                siw_dbg_cep(cep, "immediate mpa request\n");
 968
 969                siw_cep_set_inuse(new_cep);
 970                rv = siw_proc_mpareq(new_cep);
 971                siw_cep_set_free(new_cep);
 972
 973                if (rv != -EAGAIN) {
 974                        siw_cep_put(cep);
 975                        new_cep->listen_cep = NULL;
 976                        if (rv)
 977                                goto error;
 978                }
 979        }
 980        return;
 981
 982error:
 983        if (new_cep)
 984                siw_cep_put(new_cep);
 985
 986        if (new_s) {
 987                siw_socket_disassoc(new_s);
 988                sock_release(new_s);
 989                new_cep->sock = NULL;
 990        }
 991        siw_dbg_cep(cep, "error %d\n", rv);
 992}
 993
 994static void siw_cm_work_handler(struct work_struct *w)
 995{
 996        struct siw_cm_work *work;
 997        struct siw_cep *cep;
 998        int release_cep = 0, rv = 0;
 999
1000        work = container_of(w, struct siw_cm_work, work.work);
1001        cep = work->cep;
1002
1003        siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n",
1004                    cep->qp ? qp_id(cep->qp) : UINT_MAX,
1005                    work->type, cep->state);
1006
1007        siw_cep_set_inuse(cep);
1008
1009        switch (work->type) {
1010        case SIW_CM_WORK_ACCEPT:
1011                siw_accept_newconn(cep);
1012                break;
1013
1014        case SIW_CM_WORK_READ_MPAHDR:
1015                if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1016                        if (cep->listen_cep) {
1017                                siw_cep_set_inuse(cep->listen_cep);
1018
1019                                if (cep->listen_cep->state ==
1020                                    SIW_EPSTATE_LISTENING)
1021                                        rv = siw_proc_mpareq(cep);
1022                                else
1023                                        rv = -EFAULT;
1024
1025                                siw_cep_set_free(cep->listen_cep);
1026
1027                                if (rv != -EAGAIN) {
1028                                        siw_cep_put(cep->listen_cep);
1029                                        cep->listen_cep = NULL;
1030                                        if (rv)
1031                                                siw_cep_put(cep);
1032                                }
1033                        }
1034                } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1035                        rv = siw_proc_mpareply(cep);
1036                } else {
1037                        /*
1038                         * CEP already moved out of MPA handshake.
1039                         * any connection management already done.
1040                         * silently ignore the mpa packet.
1041                         */
1042                        if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1043                                cep->sock->sk->sk_data_ready(cep->sock->sk);
1044                                siw_dbg_cep(cep, "already in RDMA mode");
1045                        } else {
1046                                siw_dbg_cep(cep, "out of state: %d\n",
1047                                            cep->state);
1048                        }
1049                }
1050                if (rv && rv != -EAGAIN)
1051                        release_cep = 1;
1052                break;
1053
1054        case SIW_CM_WORK_CLOSE_LLP:
1055                /*
1056                 * QP scheduled LLP close
1057                 */
1058                if (cep->qp && cep->qp->term_info.valid)
1059                        siw_send_terminate(cep->qp);
1060
1061                if (cep->cm_id)
1062                        siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1063
1064                release_cep = 1;
1065                break;
1066
1067        case SIW_CM_WORK_PEER_CLOSE:
1068                if (cep->cm_id) {
1069                        if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1070                                /*
1071                                 * MPA reply not received, but connection drop
1072                                 */
1073                                siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1074                                              -ECONNRESET);
1075                        } else if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1076                                /*
1077                                 * NOTE: IW_CM_EVENT_DISCONNECT is given just
1078                                 *       to transition IWCM into CLOSING.
1079                                 */
1080                                siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0);
1081                                siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1082                        }
1083                        /*
1084                         * for other states there is no connection
1085                         * known to the IWCM.
1086                         */
1087                } else {
1088                        if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) {
1089                                /*
1090                                 * Wait for the ulp/CM to call accept/reject
1091                                 */
1092                                siw_dbg_cep(cep,
1093                                            "mpa req recvd, wait for ULP\n");
1094                        } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1095                                /*
1096                                 * Socket close before MPA request received.
1097                                 */
1098                                siw_dbg_cep(cep, "no mpareq: drop listener\n");
1099                                siw_cep_put(cep->listen_cep);
1100                                cep->listen_cep = NULL;
1101                        }
1102                }
1103                release_cep = 1;
1104                break;
1105
1106        case SIW_CM_WORK_MPATIMEOUT:
1107                cep->mpa_timer = NULL;
1108
1109                if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1110                        /*
1111                         * MPA request timed out:
1112                         * Hide any partially received private data and signal
1113                         * timeout
1114                         */
1115                        cep->mpa.hdr.params.pd_len = 0;
1116
1117                        if (cep->cm_id)
1118                                siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1119                                              -ETIMEDOUT);
1120                        release_cep = 1;
1121
1122                } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1123                        /*
1124                         * No MPA request received after peer TCP stream setup.
1125                         */
1126                        if (cep->listen_cep) {
1127                                siw_cep_put(cep->listen_cep);
1128                                cep->listen_cep = NULL;
1129                        }
1130                        release_cep = 1;
1131                }
1132                break;
1133
1134        default:
1135                WARN(1, "Undefined CM work type: %d\n", work->type);
1136        }
1137        if (release_cep) {
1138                siw_dbg_cep(cep,
1139                            "release: timer=%s, QP[%u]\n",
1140                            cep->mpa_timer ? "y" : "n",
1141                            cep->qp ? qp_id(cep->qp) : UINT_MAX);
1142
1143                siw_cancel_mpatimer(cep);
1144
1145                cep->state = SIW_EPSTATE_CLOSED;
1146
1147                if (cep->qp) {
1148                        struct siw_qp *qp = cep->qp;
1149                        /*
1150                         * Serialize a potential race with application
1151                         * closing the QP and calling siw_qp_cm_drop()
1152                         */
1153                        siw_qp_get(qp);
1154                        siw_cep_set_free(cep);
1155
1156                        siw_qp_llp_close(qp);
1157                        siw_qp_put(qp);
1158
1159                        siw_cep_set_inuse(cep);
1160                        cep->qp = NULL;
1161                        siw_qp_put(qp);
1162                }
1163                if (cep->sock) {
1164                        siw_socket_disassoc(cep->sock);
1165                        sock_release(cep->sock);
1166                        cep->sock = NULL;
1167                }
1168                if (cep->cm_id) {
1169                        cep->cm_id->rem_ref(cep->cm_id);
1170                        cep->cm_id = NULL;
1171                        siw_cep_put(cep);
1172                }
1173        }
1174        siw_cep_set_free(cep);
1175        siw_put_work(work);
1176        siw_cep_put(cep);
1177}
1178
1179static struct workqueue_struct *siw_cm_wq;
1180
1181int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type)
1182{
1183        struct siw_cm_work *work = siw_get_work(cep);
1184        unsigned long delay = 0;
1185
1186        if (!work) {
1187                siw_dbg_cep(cep, "failed with no work available\n");
1188                return -ENOMEM;
1189        }
1190        work->type = type;
1191        work->cep = cep;
1192
1193        siw_cep_get(cep);
1194
1195        INIT_DELAYED_WORK(&work->work, siw_cm_work_handler);
1196
1197        if (type == SIW_CM_WORK_MPATIMEOUT) {
1198                cep->mpa_timer = work;
1199
1200                if (cep->state == SIW_EPSTATE_AWAIT_MPAREP)
1201                        delay = MPAREQ_TIMEOUT;
1202                else
1203                        delay = MPAREP_TIMEOUT;
1204        }
1205        siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n",
1206                    cep->qp ? qp_id(cep->qp) : -1, type, delay);
1207
1208        queue_delayed_work(siw_cm_wq, &work->work, delay);
1209
1210        return 0;
1211}
1212
1213static void siw_cm_llp_data_ready(struct sock *sk)
1214{
1215        struct siw_cep *cep;
1216
1217        read_lock(&sk->sk_callback_lock);
1218
1219        cep = sk_to_cep(sk);
1220        if (!cep)
1221                goto out;
1222
1223        siw_dbg_cep(cep, "state: %d\n", cep->state);
1224
1225        switch (cep->state) {
1226        case SIW_EPSTATE_RDMA_MODE:
1227        case SIW_EPSTATE_LISTENING:
1228                break;
1229
1230        case SIW_EPSTATE_AWAIT_MPAREQ:
1231        case SIW_EPSTATE_AWAIT_MPAREP:
1232                siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR);
1233                break;
1234
1235        default:
1236                siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state);
1237                break;
1238        }
1239out:
1240        read_unlock(&sk->sk_callback_lock);
1241}
1242
1243static void siw_cm_llp_write_space(struct sock *sk)
1244{
1245        struct siw_cep *cep = sk_to_cep(sk);
1246
1247        if (cep)
1248                siw_dbg_cep(cep, "state: %d\n", cep->state);
1249}
1250
1251static void siw_cm_llp_error_report(struct sock *sk)
1252{
1253        struct siw_cep *cep = sk_to_cep(sk);
1254
1255        if (cep) {
1256                siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n",
1257                            sk->sk_err, sk->sk_state, cep->state);
1258                cep->sk_error_report(sk);
1259        }
1260}
1261
1262static void siw_cm_llp_state_change(struct sock *sk)
1263{
1264        struct siw_cep *cep;
1265        void (*orig_state_change)(struct sock *s);
1266
1267        read_lock(&sk->sk_callback_lock);
1268
1269        cep = sk_to_cep(sk);
1270        if (!cep) {
1271                /* endpoint already disassociated */
1272                read_unlock(&sk->sk_callback_lock);
1273                return;
1274        }
1275        orig_state_change = cep->sk_state_change;
1276
1277        siw_dbg_cep(cep, "state: %d\n", cep->state);
1278
1279        switch (sk->sk_state) {
1280        case TCP_ESTABLISHED:
1281                /*
1282                 * handle accepting socket as special case where only
1283                 * new connection is possible
1284                 */
1285                siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT);
1286                break;
1287
1288        case TCP_CLOSE:
1289        case TCP_CLOSE_WAIT:
1290                if (cep->qp)
1291                        cep->qp->tx_ctx.tx_suspend = 1;
1292                siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
1293                break;
1294
1295        default:
1296                siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state);
1297        }
1298        read_unlock(&sk->sk_callback_lock);
1299        orig_state_change(sk);
1300}
1301
1302static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
1303                              struct sockaddr *raddr)
1304{
1305        int rv, flags = 0;
1306        size_t size = laddr->sa_family == AF_INET ?
1307                sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
1308
1309        /*
1310         * Make address available again asap.
1311         */
1312        sock_set_reuseaddr(s->sk);
1313
1314        rv = s->ops->bind(s, laddr, size);
1315        if (rv < 0)
1316                return rv;
1317
1318        rv = s->ops->connect(s, raddr, size, flags);
1319
1320        return rv < 0 ? rv : 0;
1321}
1322
1323int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1324{
1325        struct siw_device *sdev = to_siw_dev(id->device);
1326        struct siw_qp *qp;
1327        struct siw_cep *cep = NULL;
1328        struct socket *s = NULL;
1329        struct sockaddr *laddr = (struct sockaddr *)&id->local_addr,
1330                        *raddr = (struct sockaddr *)&id->remote_addr;
1331        bool p2p_mode = peer_to_peer, v4 = true;
1332        u16 pd_len = params->private_data_len;
1333        int version = mpa_version, rv;
1334
1335        if (pd_len > MPA_MAX_PRIVDATA)
1336                return -EINVAL;
1337
1338        if (params->ird > sdev->attrs.max_ird ||
1339            params->ord > sdev->attrs.max_ord)
1340                return -ENOMEM;
1341
1342        if (laddr->sa_family == AF_INET6)
1343                v4 = false;
1344        else if (laddr->sa_family != AF_INET)
1345                return -EAFNOSUPPORT;
1346
1347        /*
1348         * Respect any iwarp port mapping: Use mapped remote address
1349         * if valid. Local address must not be mapped, since siw
1350         * uses kernel TCP stack.
1351         */
1352        if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
1353             to_sockaddr_in6(id->remote_addr).sin6_port != 0)
1354                raddr = (struct sockaddr *)&id->m_remote_addr;
1355
1356        qp = siw_qp_id2obj(sdev, params->qpn);
1357        if (!qp) {
1358                WARN(1, "[QP %u] does not exist\n", params->qpn);
1359                rv = -EINVAL;
1360                goto error;
1361        }
1362        siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr,
1363                   raddr);
1364
1365        rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s);
1366        if (rv < 0)
1367                goto error;
1368
1369        /*
1370         * NOTE: For simplification, connect() is called in blocking
1371         * mode. Might be reconsidered for async connection setup at
1372         * TCP level.
1373         */
1374        rv = kernel_bindconnect(s, laddr, raddr);
1375        if (rv != 0) {
1376                siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv);
1377                goto error;
1378        }
1379        if (siw_tcp_nagle == false)
1380                tcp_sock_set_nodelay(s->sk);
1381        cep = siw_cep_alloc(sdev);
1382        if (!cep) {
1383                rv = -ENOMEM;
1384                goto error;
1385        }
1386        siw_cep_set_inuse(cep);
1387
1388        /* Associate QP with CEP */
1389        siw_cep_get(cep);
1390        qp->cep = cep;
1391
1392        /* siw_qp_get(qp) already done by QP lookup */
1393        cep->qp = qp;
1394
1395        id->add_ref(id);
1396        cep->cm_id = id;
1397
1398        /*
1399         * 4: Allocate a sufficient number of work elements
1400         * to allow concurrent handling of local + peer close
1401         * events, MPA header processing + MPA timeout.
1402         */
1403        rv = siw_cm_alloc_work(cep, 4);
1404        if (rv != 0) {
1405                rv = -ENOMEM;
1406                goto error;
1407        }
1408        cep->ird = params->ird;
1409        cep->ord = params->ord;
1410
1411        if (p2p_mode && cep->ord == 0)
1412                cep->ord = 1;
1413
1414        cep->state = SIW_EPSTATE_CONNECTING;
1415
1416        /*
1417         * Associate CEP with socket
1418         */
1419        siw_cep_socket_assoc(cep, s);
1420
1421        cep->state = SIW_EPSTATE_AWAIT_MPAREP;
1422
1423        /*
1424         * Set MPA Request bits: CRC if required, no MPA Markers,
1425         * MPA Rev. according to module parameter 'mpa_version', Key 'Request'.
1426         */
1427        cep->mpa.hdr.params.bits = 0;
1428        if (version > MPA_REVISION_2) {
1429                pr_warn("Setting MPA version to %u\n", MPA_REVISION_2);
1430                version = MPA_REVISION_2;
1431                /* Adjust also module parameter */
1432                mpa_version = MPA_REVISION_2;
1433        }
1434        __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version);
1435
1436        if (try_gso)
1437                cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP;
1438
1439        if (mpa_crc_required)
1440                cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC;
1441
1442        /*
1443         * If MPA version == 2:
1444         * o Include ORD and IRD.
1445         * o Indicate peer-to-peer mode, if required by module
1446         *   parameter 'peer_to_peer'.
1447         */
1448        if (version == MPA_REVISION_2) {
1449                cep->enhanced_rdma_conn_est = true;
1450                cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED;
1451
1452                cep->mpa.v2_ctrl.ird = htons(cep->ird);
1453                cep->mpa.v2_ctrl.ord = htons(cep->ord);
1454
1455                if (p2p_mode) {
1456                        cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
1457                        cep->mpa.v2_ctrl.ord |= rtr_type;
1458                }
1459                /* Remember own P2P mode requested */
1460                cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird;
1461                cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord;
1462        }
1463        memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16);
1464
1465        rv = siw_send_mpareqrep(cep, params->private_data, pd_len);
1466        /*
1467         * Reset private data.
1468         */
1469        cep->mpa.hdr.params.pd_len = 0;
1470
1471        if (rv >= 0) {
1472                rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT);
1473                if (!rv) {
1474                        siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp));
1475                        siw_cep_set_free(cep);
1476                        return 0;
1477                }
1478        }
1479error:
1480        siw_dbg(id->device, "failed: %d\n", rv);
1481
1482        if (cep) {
1483                siw_socket_disassoc(s);
1484                sock_release(s);
1485                cep->sock = NULL;
1486
1487                cep->qp = NULL;
1488
1489                cep->cm_id = NULL;
1490                id->rem_ref(id);
1491                siw_cep_put(cep);
1492
1493                qp->cep = NULL;
1494                siw_cep_put(cep);
1495
1496                cep->state = SIW_EPSTATE_CLOSED;
1497
1498                siw_cep_set_free(cep);
1499
1500                siw_cep_put(cep);
1501
1502        } else if (s) {
1503                sock_release(s);
1504        }
1505        if (qp)
1506                siw_qp_put(qp);
1507
1508        return rv;
1509}
1510
1511/*
1512 * siw_accept - Let SoftiWARP accept an RDMA connection request
1513 *
1514 * @id:         New connection management id to be used for accepted
1515 *              connection request
1516 * @params:     Connection parameters provided by ULP for accepting connection
1517 *
1518 * Transition QP to RTS state, associate new CM id @id with accepted CEP
1519 * and get prepared for TCP input by installing socket callbacks.
1520 * Then send MPA Reply and generate the "connection established" event.
1521 * Socket callbacks must be installed before sending MPA Reply, because
1522 * the latter may cause a first RDMA message to arrive from the RDMA Initiator
1523 * side very quickly, at which time the socket callbacks must be ready.
1524 */
1525int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1526{
1527        struct siw_device *sdev = to_siw_dev(id->device);
1528        struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1529        struct siw_qp *qp;
1530        struct siw_qp_attrs qp_attrs;
1531        int rv, max_priv_data = MPA_MAX_PRIVDATA;
1532        bool wait_for_peer_rts = false;
1533
1534        siw_cep_set_inuse(cep);
1535        siw_cep_put(cep);
1536
1537        /* Free lingering inbound private data */
1538        if (cep->mpa.hdr.params.pd_len) {
1539                cep->mpa.hdr.params.pd_len = 0;
1540                kfree(cep->mpa.pdata);
1541                cep->mpa.pdata = NULL;
1542        }
1543        siw_cancel_mpatimer(cep);
1544
1545        if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1546                siw_dbg_cep(cep, "out of state\n");
1547
1548                siw_cep_set_free(cep);
1549                siw_cep_put(cep);
1550
1551                return -ECONNRESET;
1552        }
1553        qp = siw_qp_id2obj(sdev, params->qpn);
1554        if (!qp) {
1555                WARN(1, "[QP %d] does not exist\n", params->qpn);
1556                siw_cep_set_free(cep);
1557                siw_cep_put(cep);
1558
1559                return -EINVAL;
1560        }
1561        down_write(&qp->state_lock);
1562        if (qp->attrs.state > SIW_QP_STATE_RTR) {
1563                rv = -EINVAL;
1564                up_write(&qp->state_lock);
1565                goto error;
1566        }
1567        siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
1568
1569        if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
1570                siw_dbg_cep(cep, "peer allows GSO on TX\n");
1571                qp->tx_ctx.gso_seg_limit = 0;
1572        }
1573        if (params->ord > sdev->attrs.max_ord ||
1574            params->ird > sdev->attrs.max_ird) {
1575                siw_dbg_cep(
1576                        cep,
1577                        "[QP %u]: ord %d (max %d), ird %d (max %d)\n",
1578                        qp_id(qp), params->ord, sdev->attrs.max_ord,
1579                        params->ird, sdev->attrs.max_ird);
1580                rv = -EINVAL;
1581                up_write(&qp->state_lock);
1582                goto error;
1583        }
1584        if (cep->enhanced_rdma_conn_est)
1585                max_priv_data -= sizeof(struct mpa_v2_data);
1586
1587        if (params->private_data_len > max_priv_data) {
1588                siw_dbg_cep(
1589                        cep,
1590                        "[QP %u]: private data length: %d (max %d)\n",
1591                        qp_id(qp), params->private_data_len, max_priv_data);
1592                rv = -EINVAL;
1593                up_write(&qp->state_lock);
1594                goto error;
1595        }
1596        if (cep->enhanced_rdma_conn_est) {
1597                if (params->ord > cep->ord) {
1598                        if (relaxed_ird_negotiation) {
1599                                params->ord = cep->ord;
1600                        } else {
1601                                cep->ird = params->ird;
1602                                cep->ord = params->ord;
1603                                rv = -EINVAL;
1604                                up_write(&qp->state_lock);
1605                                goto error;
1606                        }
1607                }
1608                if (params->ird < cep->ird) {
1609                        if (relaxed_ird_negotiation &&
1610                            cep->ird <= sdev->attrs.max_ird)
1611                                params->ird = cep->ird;
1612                        else {
1613                                rv = -ENOMEM;
1614                                up_write(&qp->state_lock);
1615                                goto error;
1616                        }
1617                }
1618                if (cep->mpa.v2_ctrl.ord &
1619                    (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR))
1620                        wait_for_peer_rts = true;
1621                /*
1622                 * Signal back negotiated IRD and ORD values
1623                 */
1624                cep->mpa.v2_ctrl.ord =
1625                        htons(params->ord & MPA_IRD_ORD_MASK) |
1626                        (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD);
1627                cep->mpa.v2_ctrl.ird =
1628                        htons(params->ird & MPA_IRD_ORD_MASK) |
1629                        (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD);
1630        }
1631        cep->ird = params->ird;
1632        cep->ord = params->ord;
1633
1634        cep->cm_id = id;
1635        id->add_ref(id);
1636
1637        memset(&qp_attrs, 0, sizeof(qp_attrs));
1638        qp_attrs.orq_size = cep->ord;
1639        qp_attrs.irq_size = cep->ird;
1640        qp_attrs.sk = cep->sock;
1641        if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC)
1642                qp_attrs.flags = SIW_MPA_CRC;
1643        qp_attrs.state = SIW_QP_STATE_RTS;
1644
1645        siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp));
1646
1647        /* Associate QP with CEP */
1648        siw_cep_get(cep);
1649        qp->cep = cep;
1650
1651        /* siw_qp_get(qp) already done by QP lookup */
1652        cep->qp = qp;
1653
1654        cep->state = SIW_EPSTATE_RDMA_MODE;
1655
1656        /* Move socket RX/TX under QP control */
1657        rv = siw_qp_modify(qp, &qp_attrs,
1658                           SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
1659                                   SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
1660                                   SIW_QP_ATTR_MPA);
1661        up_write(&qp->state_lock);
1662
1663        if (rv)
1664                goto error;
1665
1666        siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n",
1667                    qp_id(qp), params->private_data_len);
1668
1669        rv = siw_send_mpareqrep(cep, params->private_data,
1670                                params->private_data_len);
1671        if (rv != 0)
1672                goto error;
1673
1674        if (wait_for_peer_rts) {
1675                siw_sk_assign_rtr_upcalls(cep);
1676        } else {
1677                siw_qp_socket_assoc(cep, qp);
1678                rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
1679                if (rv)
1680                        goto error;
1681        }
1682        siw_cep_set_free(cep);
1683
1684        return 0;
1685error:
1686        siw_socket_disassoc(cep->sock);
1687        sock_release(cep->sock);
1688        cep->sock = NULL;
1689
1690        cep->state = SIW_EPSTATE_CLOSED;
1691
1692        if (cep->cm_id) {
1693                cep->cm_id->rem_ref(id);
1694                cep->cm_id = NULL;
1695        }
1696        if (qp->cep) {
1697                siw_cep_put(cep);
1698                qp->cep = NULL;
1699        }
1700        cep->qp = NULL;
1701        siw_qp_put(qp);
1702
1703        siw_cep_set_free(cep);
1704        siw_cep_put(cep);
1705
1706        return rv;
1707}
1708
1709/*
1710 * siw_reject()
1711 *
1712 * Local connection reject case. Send private data back to peer,
1713 * close connection and dereference connection id.
1714 */
1715int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len)
1716{
1717        struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1718
1719        siw_cep_set_inuse(cep);
1720        siw_cep_put(cep);
1721
1722        siw_cancel_mpatimer(cep);
1723
1724        if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1725                siw_dbg_cep(cep, "out of state\n");
1726
1727                siw_cep_set_free(cep);
1728                siw_cep_put(cep); /* put last reference */
1729
1730                return -ECONNRESET;
1731        }
1732        siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state,
1733                    pd_len);
1734
1735        if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) {
1736                cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */
1737                siw_send_mpareqrep(cep, pdata, pd_len);
1738        }
1739        siw_socket_disassoc(cep->sock);
1740        sock_release(cep->sock);
1741        cep->sock = NULL;
1742
1743        cep->state = SIW_EPSTATE_CLOSED;
1744
1745        siw_cep_set_free(cep);
1746        siw_cep_put(cep);
1747
1748        return 0;
1749}
1750
1751/*
1752 * siw_create_listen - Create resources for a listener's IWCM ID @id
1753 *
1754 * Starts listen on the socket address id->local_addr.
1755 *
1756 */
1757int siw_create_listen(struct iw_cm_id *id, int backlog)
1758{
1759        struct socket *s;
1760        struct siw_cep *cep = NULL;
1761        struct siw_device *sdev = to_siw_dev(id->device);
1762        int addr_family = id->local_addr.ss_family;
1763        int rv = 0;
1764
1765        if (addr_family != AF_INET && addr_family != AF_INET6)
1766                return -EAFNOSUPPORT;
1767
1768        rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s);
1769        if (rv < 0)
1770                return rv;
1771
1772        /*
1773         * Allow binding local port when still in TIME_WAIT from last close.
1774         */
1775        sock_set_reuseaddr(s->sk);
1776
1777        if (addr_family == AF_INET) {
1778                struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
1779
1780                /* For wildcard addr, limit binding to current device only */
1781                if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
1782                        s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1783
1784                rv = s->ops->bind(s, (struct sockaddr *)laddr,
1785                                  sizeof(struct sockaddr_in));
1786        } else {
1787                struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
1788
1789                /* For wildcard addr, limit binding to current device only */
1790                if (ipv6_addr_any(&laddr->sin6_addr))
1791                        s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1792
1793                rv = s->ops->bind(s, (struct sockaddr *)laddr,
1794                                  sizeof(struct sockaddr_in6));
1795        }
1796        if (rv) {
1797                siw_dbg(id->device, "socket bind error: %d\n", rv);
1798                goto error;
1799        }
1800        cep = siw_cep_alloc(sdev);
1801        if (!cep) {
1802                rv = -ENOMEM;
1803                goto error;
1804        }
1805        siw_cep_socket_assoc(cep, s);
1806
1807        rv = siw_cm_alloc_work(cep, backlog);
1808        if (rv) {
1809                siw_dbg(id->device,
1810                        "alloc_work error %d, backlog %d\n",
1811                        rv, backlog);
1812                goto error;
1813        }
1814        rv = s->ops->listen(s, backlog);
1815        if (rv) {
1816                siw_dbg(id->device, "listen error %d\n", rv);
1817                goto error;
1818        }
1819        cep->cm_id = id;
1820        id->add_ref(id);
1821
1822        /*
1823         * In case of a wildcard rdma_listen on a multi-homed device,
1824         * a listener's IWCM id is associated with more than one listening CEP.
1825         *
1826         * We currently use id->provider_data in three different ways:
1827         *
1828         * o For a listener's IWCM id, id->provider_data points to
1829         *   the list_head of the list of listening CEPs.
1830         *   Uses: siw_create_listen(), siw_destroy_listen()
1831         *
1832         * o For each accepted passive-side IWCM id, id->provider_data
1833         *   points to the CEP itself. This is a consequence of
1834         *   - siw_cm_upcall() setting event.provider_data = cep and
1835         *   - the IWCM's cm_conn_req_handler() setting provider_data of the
1836         *     new passive-side IWCM id equal to event.provider_data
1837         *   Uses: siw_accept(), siw_reject()
1838         *
1839         * o For an active-side IWCM id, id->provider_data is not used at all.
1840         *
1841         */
1842        if (!id->provider_data) {
1843                id->provider_data =
1844                        kmalloc(sizeof(struct list_head), GFP_KERNEL);
1845                if (!id->provider_data) {
1846                        rv = -ENOMEM;
1847                        goto error;
1848                }
1849                INIT_LIST_HEAD((struct list_head *)id->provider_data);
1850        }
1851        list_add_tail(&cep->listenq, (struct list_head *)id->provider_data);
1852        cep->state = SIW_EPSTATE_LISTENING;
1853
1854        siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr);
1855
1856        return 0;
1857
1858error:
1859        siw_dbg(id->device, "failed: %d\n", rv);
1860
1861        if (cep) {
1862                siw_cep_set_inuse(cep);
1863
1864                if (cep->cm_id) {
1865                        cep->cm_id->rem_ref(cep->cm_id);
1866                        cep->cm_id = NULL;
1867                }
1868                cep->sock = NULL;
1869                siw_socket_disassoc(s);
1870                cep->state = SIW_EPSTATE_CLOSED;
1871
1872                siw_cep_set_free(cep);
1873                siw_cep_put(cep);
1874        }
1875        sock_release(s);
1876
1877        return rv;
1878}
1879
1880static void siw_drop_listeners(struct iw_cm_id *id)
1881{
1882        struct list_head *p, *tmp;
1883
1884        /*
1885         * In case of a wildcard rdma_listen on a multi-homed device,
1886         * a listener's IWCM id is associated with more than one listening CEP.
1887         */
1888        list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) {
1889                struct siw_cep *cep = list_entry(p, struct siw_cep, listenq);
1890
1891                list_del(p);
1892
1893                siw_dbg_cep(cep, "drop cep, state %d\n", cep->state);
1894
1895                siw_cep_set_inuse(cep);
1896
1897                if (cep->cm_id) {
1898                        cep->cm_id->rem_ref(cep->cm_id);
1899                        cep->cm_id = NULL;
1900                }
1901                if (cep->sock) {
1902                        siw_socket_disassoc(cep->sock);
1903                        sock_release(cep->sock);
1904                        cep->sock = NULL;
1905                }
1906                cep->state = SIW_EPSTATE_CLOSED;
1907                siw_cep_set_free(cep);
1908                siw_cep_put(cep);
1909        }
1910}
1911
1912int siw_destroy_listen(struct iw_cm_id *id)
1913{
1914        if (!id->provider_data) {
1915                siw_dbg(id->device, "no cep(s)\n");
1916                return 0;
1917        }
1918        siw_drop_listeners(id);
1919        kfree(id->provider_data);
1920        id->provider_data = NULL;
1921
1922        return 0;
1923}
1924
1925int siw_cm_init(void)
1926{
1927        /*
1928         * create_single_workqueue for strict ordering
1929         */
1930        siw_cm_wq = create_singlethread_workqueue("siw_cm_wq");
1931        if (!siw_cm_wq)
1932                return -ENOMEM;
1933
1934        return 0;
1935}
1936
1937void siw_cm_exit(void)
1938{
1939        if (siw_cm_wq) {
1940                flush_workqueue(siw_cm_wq);
1941                destroy_workqueue(siw_cm_wq);
1942        }
1943}
1944