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 */ 31 static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR; 32 static const bool relaxed_ird_negotiation = true; 33 34 static void siw_cm_llp_state_change(struct sock *s); 35 static void siw_cm_llp_data_ready(struct sock *s); 36 static void siw_cm_llp_write_space(struct sock *s); 37 static void siw_cm_llp_error_report(struct sock *s); 38 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason, 39 int status); 40 41 static 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 51 static 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 63 static 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 72 static 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 86 static 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 } 105 106 static 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); 134 out: 135 read_unlock(&sk->sk_callback_lock); 136 if (qp) 137 siw_qp_socket_assoc(cep, qp); 138 } 139 140 static 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 } 149 150 static 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 } 159 160 static 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 } 186 187 static 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 } 198 199 static 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 } 211 212 static 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 } 219 220 static void siw_cep_set_inuse(struct siw_cep *cep) 221 { 222 unsigned long flags; 223 retry: 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 } 237 238 static 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 } 248 249 static 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 } 271 272 static 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 } 285 286 static 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 */ 309 static 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 */ 372 void 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 } 434 out: 435 siw_cep_set_free(cep); 436 } 437 } 438 439 void 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 } 444 445 void 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 */ 453 static 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 */ 500 static 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 */ 590 static 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; 692 693 reject_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 } 714 715 static 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 } 896 897 out_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 */ 907 static 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 if (rv != -EAGAIN) { 972 siw_cep_put(cep); 973 new_cep->listen_cep = NULL; 974 if (rv) { 975 siw_cep_set_free(new_cep); 976 goto error; 977 } 978 } 979 siw_cep_set_free(new_cep); 980 } 981 return; 982 983 error: 984 if (new_cep) 985 siw_cep_put(new_cep); 986 987 if (new_s) { 988 siw_socket_disassoc(new_s); 989 sock_release(new_s); 990 new_cep->sock = NULL; 991 } 992 siw_dbg_cep(cep, "error %d\n", rv); 993 } 994 995 static void siw_cm_work_handler(struct work_struct *w) 996 { 997 struct siw_cm_work *work; 998 struct siw_cep *cep; 999 int release_cep = 0, rv = 0; 1000 1001 work = container_of(w, struct siw_cm_work, work.work); 1002 cep = work->cep; 1003 1004 siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n", 1005 cep->qp ? qp_id(cep->qp) : UINT_MAX, 1006 work->type, cep->state); 1007 1008 siw_cep_set_inuse(cep); 1009 1010 switch (work->type) { 1011 case SIW_CM_WORK_ACCEPT: 1012 siw_accept_newconn(cep); 1013 break; 1014 1015 case SIW_CM_WORK_READ_MPAHDR: 1016 if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { 1017 if (cep->listen_cep) { 1018 siw_cep_set_inuse(cep->listen_cep); 1019 1020 if (cep->listen_cep->state == 1021 SIW_EPSTATE_LISTENING) 1022 rv = siw_proc_mpareq(cep); 1023 else 1024 rv = -EFAULT; 1025 1026 siw_cep_set_free(cep->listen_cep); 1027 1028 if (rv != -EAGAIN) { 1029 siw_cep_put(cep->listen_cep); 1030 cep->listen_cep = NULL; 1031 if (rv) 1032 siw_cep_put(cep); 1033 } 1034 } 1035 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { 1036 rv = siw_proc_mpareply(cep); 1037 } else { 1038 /* 1039 * CEP already moved out of MPA handshake. 1040 * any connection management already done. 1041 * silently ignore the mpa packet. 1042 */ 1043 if (cep->state == SIW_EPSTATE_RDMA_MODE) { 1044 cep->sock->sk->sk_data_ready(cep->sock->sk); 1045 siw_dbg_cep(cep, "already in RDMA mode"); 1046 } else { 1047 siw_dbg_cep(cep, "out of state: %d\n", 1048 cep->state); 1049 } 1050 } 1051 if (rv && rv != -EAGAIN) 1052 release_cep = 1; 1053 break; 1054 1055 case SIW_CM_WORK_CLOSE_LLP: 1056 /* 1057 * QP scheduled LLP close 1058 */ 1059 if (cep->qp && cep->qp->term_info.valid) 1060 siw_send_terminate(cep->qp); 1061 1062 if (cep->cm_id) 1063 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); 1064 1065 release_cep = 1; 1066 break; 1067 1068 case SIW_CM_WORK_PEER_CLOSE: 1069 if (cep->cm_id) { 1070 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { 1071 /* 1072 * MPA reply not received, but connection drop 1073 */ 1074 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 1075 -ECONNRESET); 1076 } else if (cep->state == SIW_EPSTATE_RDMA_MODE) { 1077 /* 1078 * NOTE: IW_CM_EVENT_DISCONNECT is given just 1079 * to transition IWCM into CLOSING. 1080 */ 1081 siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0); 1082 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); 1083 } 1084 /* 1085 * for other states there is no connection 1086 * known to the IWCM. 1087 */ 1088 } else { 1089 if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) { 1090 /* 1091 * Wait for the ulp/CM to call accept/reject 1092 */ 1093 siw_dbg_cep(cep, 1094 "mpa req recvd, wait for ULP\n"); 1095 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { 1096 /* 1097 * Socket close before MPA request received. 1098 */ 1099 siw_dbg_cep(cep, "no mpareq: drop listener\n"); 1100 siw_cep_put(cep->listen_cep); 1101 cep->listen_cep = NULL; 1102 } 1103 } 1104 release_cep = 1; 1105 break; 1106 1107 case SIW_CM_WORK_MPATIMEOUT: 1108 cep->mpa_timer = NULL; 1109 1110 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { 1111 /* 1112 * MPA request timed out: 1113 * Hide any partially received private data and signal 1114 * timeout 1115 */ 1116 cep->mpa.hdr.params.pd_len = 0; 1117 1118 if (cep->cm_id) 1119 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 1120 -ETIMEDOUT); 1121 release_cep = 1; 1122 1123 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { 1124 /* 1125 * No MPA request received after peer TCP stream setup. 1126 */ 1127 if (cep->listen_cep) { 1128 siw_cep_put(cep->listen_cep); 1129 cep->listen_cep = NULL; 1130 } 1131 release_cep = 1; 1132 } 1133 break; 1134 1135 default: 1136 WARN(1, "Undefined CM work type: %d\n", work->type); 1137 } 1138 if (release_cep) { 1139 siw_dbg_cep(cep, 1140 "release: timer=%s, QP[%u]\n", 1141 cep->mpa_timer ? "y" : "n", 1142 cep->qp ? qp_id(cep->qp) : UINT_MAX); 1143 1144 siw_cancel_mpatimer(cep); 1145 1146 cep->state = SIW_EPSTATE_CLOSED; 1147 1148 if (cep->qp) { 1149 struct siw_qp *qp = cep->qp; 1150 /* 1151 * Serialize a potential race with application 1152 * closing the QP and calling siw_qp_cm_drop() 1153 */ 1154 siw_qp_get(qp); 1155 siw_cep_set_free(cep); 1156 1157 siw_qp_llp_close(qp); 1158 siw_qp_put(qp); 1159 1160 siw_cep_set_inuse(cep); 1161 cep->qp = NULL; 1162 siw_qp_put(qp); 1163 } 1164 if (cep->sock) { 1165 siw_socket_disassoc(cep->sock); 1166 sock_release(cep->sock); 1167 cep->sock = NULL; 1168 } 1169 if (cep->cm_id) { 1170 cep->cm_id->rem_ref(cep->cm_id); 1171 cep->cm_id = NULL; 1172 siw_cep_put(cep); 1173 } 1174 } 1175 siw_cep_set_free(cep); 1176 siw_put_work(work); 1177 siw_cep_put(cep); 1178 } 1179 1180 static struct workqueue_struct *siw_cm_wq; 1181 1182 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type) 1183 { 1184 struct siw_cm_work *work = siw_get_work(cep); 1185 unsigned long delay = 0; 1186 1187 if (!work) { 1188 siw_dbg_cep(cep, "failed with no work available\n"); 1189 return -ENOMEM; 1190 } 1191 work->type = type; 1192 work->cep = cep; 1193 1194 siw_cep_get(cep); 1195 1196 INIT_DELAYED_WORK(&work->work, siw_cm_work_handler); 1197 1198 if (type == SIW_CM_WORK_MPATIMEOUT) { 1199 cep->mpa_timer = work; 1200 1201 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) 1202 delay = MPAREQ_TIMEOUT; 1203 else 1204 delay = MPAREP_TIMEOUT; 1205 } 1206 siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n", 1207 cep->qp ? qp_id(cep->qp) : -1, type, delay); 1208 1209 queue_delayed_work(siw_cm_wq, &work->work, delay); 1210 1211 return 0; 1212 } 1213 1214 static void siw_cm_llp_data_ready(struct sock *sk) 1215 { 1216 struct siw_cep *cep; 1217 1218 read_lock(&sk->sk_callback_lock); 1219 1220 cep = sk_to_cep(sk); 1221 if (!cep) 1222 goto out; 1223 1224 siw_dbg_cep(cep, "state: %d\n", cep->state); 1225 1226 switch (cep->state) { 1227 case SIW_EPSTATE_RDMA_MODE: 1228 case SIW_EPSTATE_LISTENING: 1229 break; 1230 1231 case SIW_EPSTATE_AWAIT_MPAREQ: 1232 case SIW_EPSTATE_AWAIT_MPAREP: 1233 siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR); 1234 break; 1235 1236 default: 1237 siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state); 1238 break; 1239 } 1240 out: 1241 read_unlock(&sk->sk_callback_lock); 1242 } 1243 1244 static void siw_cm_llp_write_space(struct sock *sk) 1245 { 1246 struct siw_cep *cep = sk_to_cep(sk); 1247 1248 if (cep) 1249 siw_dbg_cep(cep, "state: %d\n", cep->state); 1250 } 1251 1252 static void siw_cm_llp_error_report(struct sock *sk) 1253 { 1254 struct siw_cep *cep = sk_to_cep(sk); 1255 1256 if (cep) { 1257 siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n", 1258 sk->sk_err, sk->sk_state, cep->state); 1259 cep->sk_error_report(sk); 1260 } 1261 } 1262 1263 static void siw_cm_llp_state_change(struct sock *sk) 1264 { 1265 struct siw_cep *cep; 1266 void (*orig_state_change)(struct sock *s); 1267 1268 read_lock(&sk->sk_callback_lock); 1269 1270 cep = sk_to_cep(sk); 1271 if (!cep) { 1272 /* endpoint already disassociated */ 1273 read_unlock(&sk->sk_callback_lock); 1274 return; 1275 } 1276 orig_state_change = cep->sk_state_change; 1277 1278 siw_dbg_cep(cep, "state: %d\n", cep->state); 1279 1280 switch (sk->sk_state) { 1281 case TCP_ESTABLISHED: 1282 /* 1283 * handle accepting socket as special case where only 1284 * new connection is possible 1285 */ 1286 siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT); 1287 break; 1288 1289 case TCP_CLOSE: 1290 case TCP_CLOSE_WAIT: 1291 if (cep->qp) 1292 cep->qp->tx_ctx.tx_suspend = 1; 1293 siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE); 1294 break; 1295 1296 default: 1297 siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state); 1298 } 1299 read_unlock(&sk->sk_callback_lock); 1300 orig_state_change(sk); 1301 } 1302 1303 static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr, 1304 struct sockaddr *raddr, bool afonly) 1305 { 1306 int rv, flags = 0; 1307 size_t size = laddr->sa_family == AF_INET ? 1308 sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6); 1309 1310 /* 1311 * Make address available again asap. 1312 */ 1313 sock_set_reuseaddr(s->sk); 1314 1315 if (afonly) { 1316 rv = ip6_sock_set_v6only(s->sk); 1317 if (rv) 1318 return rv; 1319 } 1320 1321 rv = s->ops->bind(s, laddr, size); 1322 if (rv < 0) 1323 return rv; 1324 1325 rv = s->ops->connect(s, raddr, size, flags); 1326 1327 return rv < 0 ? rv : 0; 1328 } 1329 1330 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params) 1331 { 1332 struct siw_device *sdev = to_siw_dev(id->device); 1333 struct siw_qp *qp; 1334 struct siw_cep *cep = NULL; 1335 struct socket *s = NULL; 1336 struct sockaddr *laddr = (struct sockaddr *)&id->local_addr, 1337 *raddr = (struct sockaddr *)&id->remote_addr; 1338 bool p2p_mode = peer_to_peer, v4 = true; 1339 u16 pd_len = params->private_data_len; 1340 int version = mpa_version, rv; 1341 1342 if (pd_len > MPA_MAX_PRIVDATA) 1343 return -EINVAL; 1344 1345 if (params->ird > sdev->attrs.max_ird || 1346 params->ord > sdev->attrs.max_ord) 1347 return -ENOMEM; 1348 1349 if (laddr->sa_family == AF_INET6) 1350 v4 = false; 1351 else if (laddr->sa_family != AF_INET) 1352 return -EAFNOSUPPORT; 1353 1354 /* 1355 * Respect any iwarp port mapping: Use mapped remote address 1356 * if valid. Local address must not be mapped, since siw 1357 * uses kernel TCP stack. 1358 */ 1359 if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) || 1360 to_sockaddr_in6(id->remote_addr).sin6_port != 0) 1361 raddr = (struct sockaddr *)&id->m_remote_addr; 1362 1363 qp = siw_qp_id2obj(sdev, params->qpn); 1364 if (!qp) { 1365 WARN(1, "[QP %u] does not exist\n", params->qpn); 1366 rv = -EINVAL; 1367 goto error; 1368 } 1369 siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr, 1370 raddr); 1371 1372 rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s); 1373 if (rv < 0) 1374 goto error; 1375 1376 /* 1377 * NOTE: For simplification, connect() is called in blocking 1378 * mode. Might be reconsidered for async connection setup at 1379 * TCP level. 1380 */ 1381 rv = kernel_bindconnect(s, laddr, raddr, id->afonly); 1382 if (rv != 0) { 1383 siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv); 1384 goto error; 1385 } 1386 if (siw_tcp_nagle == false) 1387 tcp_sock_set_nodelay(s->sk); 1388 cep = siw_cep_alloc(sdev); 1389 if (!cep) { 1390 rv = -ENOMEM; 1391 goto error; 1392 } 1393 siw_cep_set_inuse(cep); 1394 1395 /* Associate QP with CEP */ 1396 siw_cep_get(cep); 1397 qp->cep = cep; 1398 1399 /* siw_qp_get(qp) already done by QP lookup */ 1400 cep->qp = qp; 1401 1402 id->add_ref(id); 1403 cep->cm_id = id; 1404 1405 /* 1406 * 4: Allocate a sufficient number of work elements 1407 * to allow concurrent handling of local + peer close 1408 * events, MPA header processing + MPA timeout. 1409 */ 1410 rv = siw_cm_alloc_work(cep, 4); 1411 if (rv != 0) { 1412 rv = -ENOMEM; 1413 goto error; 1414 } 1415 cep->ird = params->ird; 1416 cep->ord = params->ord; 1417 1418 if (p2p_mode && cep->ord == 0) 1419 cep->ord = 1; 1420 1421 cep->state = SIW_EPSTATE_CONNECTING; 1422 1423 /* 1424 * Associate CEP with socket 1425 */ 1426 siw_cep_socket_assoc(cep, s); 1427 1428 cep->state = SIW_EPSTATE_AWAIT_MPAREP; 1429 1430 /* 1431 * Set MPA Request bits: CRC if required, no MPA Markers, 1432 * MPA Rev. according to module parameter 'mpa_version', Key 'Request'. 1433 */ 1434 cep->mpa.hdr.params.bits = 0; 1435 if (version > MPA_REVISION_2) { 1436 pr_warn("Setting MPA version to %u\n", MPA_REVISION_2); 1437 version = MPA_REVISION_2; 1438 /* Adjust also module parameter */ 1439 mpa_version = MPA_REVISION_2; 1440 } 1441 __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version); 1442 1443 if (try_gso) 1444 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP; 1445 1446 if (mpa_crc_required) 1447 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC; 1448 1449 /* 1450 * If MPA version == 2: 1451 * o Include ORD and IRD. 1452 * o Indicate peer-to-peer mode, if required by module 1453 * parameter 'peer_to_peer'. 1454 */ 1455 if (version == MPA_REVISION_2) { 1456 cep->enhanced_rdma_conn_est = true; 1457 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED; 1458 1459 cep->mpa.v2_ctrl.ird = htons(cep->ird); 1460 cep->mpa.v2_ctrl.ord = htons(cep->ord); 1461 1462 if (p2p_mode) { 1463 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER; 1464 cep->mpa.v2_ctrl.ord |= rtr_type; 1465 } 1466 /* Remember own P2P mode requested */ 1467 cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird; 1468 cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord; 1469 } 1470 memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16); 1471 1472 rv = siw_send_mpareqrep(cep, params->private_data, pd_len); 1473 /* 1474 * Reset private data. 1475 */ 1476 cep->mpa.hdr.params.pd_len = 0; 1477 1478 if (rv >= 0) { 1479 rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT); 1480 if (!rv) { 1481 siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp)); 1482 siw_cep_set_free(cep); 1483 return 0; 1484 } 1485 } 1486 error: 1487 siw_dbg(id->device, "failed: %d\n", rv); 1488 1489 if (cep) { 1490 siw_socket_disassoc(s); 1491 sock_release(s); 1492 cep->sock = NULL; 1493 1494 cep->qp = NULL; 1495 1496 cep->cm_id = NULL; 1497 id->rem_ref(id); 1498 siw_cep_put(cep); 1499 1500 qp->cep = NULL; 1501 siw_cep_put(cep); 1502 1503 cep->state = SIW_EPSTATE_CLOSED; 1504 1505 siw_cep_set_free(cep); 1506 1507 siw_cep_put(cep); 1508 1509 } else if (s) { 1510 sock_release(s); 1511 } 1512 if (qp) 1513 siw_qp_put(qp); 1514 1515 return rv; 1516 } 1517 1518 /* 1519 * siw_accept - Let SoftiWARP accept an RDMA connection request 1520 * 1521 * @id: New connection management id to be used for accepted 1522 * connection request 1523 * @params: Connection parameters provided by ULP for accepting connection 1524 * 1525 * Transition QP to RTS state, associate new CM id @id with accepted CEP 1526 * and get prepared for TCP input by installing socket callbacks. 1527 * Then send MPA Reply and generate the "connection established" event. 1528 * Socket callbacks must be installed before sending MPA Reply, because 1529 * the latter may cause a first RDMA message to arrive from the RDMA Initiator 1530 * side very quickly, at which time the socket callbacks must be ready. 1531 */ 1532 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params) 1533 { 1534 struct siw_device *sdev = to_siw_dev(id->device); 1535 struct siw_cep *cep = (struct siw_cep *)id->provider_data; 1536 struct siw_qp *qp; 1537 struct siw_qp_attrs qp_attrs; 1538 int rv, max_priv_data = MPA_MAX_PRIVDATA; 1539 bool wait_for_peer_rts = false; 1540 1541 siw_cep_set_inuse(cep); 1542 siw_cep_put(cep); 1543 1544 /* Free lingering inbound private data */ 1545 if (cep->mpa.hdr.params.pd_len) { 1546 cep->mpa.hdr.params.pd_len = 0; 1547 kfree(cep->mpa.pdata); 1548 cep->mpa.pdata = NULL; 1549 } 1550 siw_cancel_mpatimer(cep); 1551 1552 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) { 1553 siw_dbg_cep(cep, "out of state\n"); 1554 1555 siw_cep_set_free(cep); 1556 siw_cep_put(cep); 1557 1558 return -ECONNRESET; 1559 } 1560 qp = siw_qp_id2obj(sdev, params->qpn); 1561 if (!qp) { 1562 WARN(1, "[QP %d] does not exist\n", params->qpn); 1563 siw_cep_set_free(cep); 1564 siw_cep_put(cep); 1565 1566 return -EINVAL; 1567 } 1568 down_write(&qp->state_lock); 1569 if (qp->attrs.state > SIW_QP_STATE_RTR) { 1570 rv = -EINVAL; 1571 up_write(&qp->state_lock); 1572 goto error; 1573 } 1574 siw_dbg_cep(cep, "[QP %d]\n", params->qpn); 1575 1576 if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) { 1577 siw_dbg_cep(cep, "peer allows GSO on TX\n"); 1578 qp->tx_ctx.gso_seg_limit = 0; 1579 } 1580 if (params->ord > sdev->attrs.max_ord || 1581 params->ird > sdev->attrs.max_ird) { 1582 siw_dbg_cep( 1583 cep, 1584 "[QP %u]: ord %d (max %d), ird %d (max %d)\n", 1585 qp_id(qp), params->ord, sdev->attrs.max_ord, 1586 params->ird, sdev->attrs.max_ird); 1587 rv = -EINVAL; 1588 up_write(&qp->state_lock); 1589 goto error; 1590 } 1591 if (cep->enhanced_rdma_conn_est) 1592 max_priv_data -= sizeof(struct mpa_v2_data); 1593 1594 if (params->private_data_len > max_priv_data) { 1595 siw_dbg_cep( 1596 cep, 1597 "[QP %u]: private data length: %d (max %d)\n", 1598 qp_id(qp), params->private_data_len, max_priv_data); 1599 rv = -EINVAL; 1600 up_write(&qp->state_lock); 1601 goto error; 1602 } 1603 if (cep->enhanced_rdma_conn_est) { 1604 if (params->ord > cep->ord) { 1605 if (relaxed_ird_negotiation) { 1606 params->ord = cep->ord; 1607 } else { 1608 cep->ird = params->ird; 1609 cep->ord = params->ord; 1610 rv = -EINVAL; 1611 up_write(&qp->state_lock); 1612 goto error; 1613 } 1614 } 1615 if (params->ird < cep->ird) { 1616 if (relaxed_ird_negotiation && 1617 cep->ird <= sdev->attrs.max_ird) 1618 params->ird = cep->ird; 1619 else { 1620 rv = -ENOMEM; 1621 up_write(&qp->state_lock); 1622 goto error; 1623 } 1624 } 1625 if (cep->mpa.v2_ctrl.ord & 1626 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR)) 1627 wait_for_peer_rts = true; 1628 /* 1629 * Signal back negotiated IRD and ORD values 1630 */ 1631 cep->mpa.v2_ctrl.ord = 1632 htons(params->ord & MPA_IRD_ORD_MASK) | 1633 (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD); 1634 cep->mpa.v2_ctrl.ird = 1635 htons(params->ird & MPA_IRD_ORD_MASK) | 1636 (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD); 1637 } 1638 cep->ird = params->ird; 1639 cep->ord = params->ord; 1640 1641 cep->cm_id = id; 1642 id->add_ref(id); 1643 1644 memset(&qp_attrs, 0, sizeof(qp_attrs)); 1645 qp_attrs.orq_size = cep->ord; 1646 qp_attrs.irq_size = cep->ird; 1647 qp_attrs.sk = cep->sock; 1648 if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC) 1649 qp_attrs.flags = SIW_MPA_CRC; 1650 qp_attrs.state = SIW_QP_STATE_RTS; 1651 1652 siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp)); 1653 1654 /* Associate QP with CEP */ 1655 siw_cep_get(cep); 1656 qp->cep = cep; 1657 1658 /* siw_qp_get(qp) already done by QP lookup */ 1659 cep->qp = qp; 1660 1661 cep->state = SIW_EPSTATE_RDMA_MODE; 1662 1663 /* Move socket RX/TX under QP control */ 1664 rv = siw_qp_modify(qp, &qp_attrs, 1665 SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE | 1666 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | 1667 SIW_QP_ATTR_MPA); 1668 up_write(&qp->state_lock); 1669 1670 if (rv) 1671 goto error; 1672 1673 siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n", 1674 qp_id(qp), params->private_data_len); 1675 1676 rv = siw_send_mpareqrep(cep, params->private_data, 1677 params->private_data_len); 1678 if (rv != 0) 1679 goto error; 1680 1681 if (wait_for_peer_rts) { 1682 siw_sk_assign_rtr_upcalls(cep); 1683 } else { 1684 siw_qp_socket_assoc(cep, qp); 1685 rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0); 1686 if (rv) 1687 goto error; 1688 } 1689 siw_cep_set_free(cep); 1690 1691 return 0; 1692 error: 1693 siw_socket_disassoc(cep->sock); 1694 sock_release(cep->sock); 1695 cep->sock = NULL; 1696 1697 cep->state = SIW_EPSTATE_CLOSED; 1698 1699 if (cep->cm_id) { 1700 cep->cm_id->rem_ref(id); 1701 cep->cm_id = NULL; 1702 } 1703 if (qp->cep) { 1704 siw_cep_put(cep); 1705 qp->cep = NULL; 1706 } 1707 cep->qp = NULL; 1708 siw_qp_put(qp); 1709 1710 siw_cep_set_free(cep); 1711 siw_cep_put(cep); 1712 1713 return rv; 1714 } 1715 1716 /* 1717 * siw_reject() 1718 * 1719 * Local connection reject case. Send private data back to peer, 1720 * close connection and dereference connection id. 1721 */ 1722 int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len) 1723 { 1724 struct siw_cep *cep = (struct siw_cep *)id->provider_data; 1725 1726 siw_cep_set_inuse(cep); 1727 siw_cep_put(cep); 1728 1729 siw_cancel_mpatimer(cep); 1730 1731 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) { 1732 siw_dbg_cep(cep, "out of state\n"); 1733 1734 siw_cep_set_free(cep); 1735 siw_cep_put(cep); /* put last reference */ 1736 1737 return -ECONNRESET; 1738 } 1739 siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state, 1740 pd_len); 1741 1742 if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) { 1743 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */ 1744 siw_send_mpareqrep(cep, pdata, pd_len); 1745 } 1746 siw_socket_disassoc(cep->sock); 1747 sock_release(cep->sock); 1748 cep->sock = NULL; 1749 1750 cep->state = SIW_EPSTATE_CLOSED; 1751 1752 siw_cep_set_free(cep); 1753 siw_cep_put(cep); 1754 1755 return 0; 1756 } 1757 1758 /* 1759 * siw_create_listen - Create resources for a listener's IWCM ID @id 1760 * 1761 * Starts listen on the socket address id->local_addr. 1762 * 1763 */ 1764 int siw_create_listen(struct iw_cm_id *id, int backlog) 1765 { 1766 struct socket *s; 1767 struct siw_cep *cep = NULL; 1768 struct siw_device *sdev = to_siw_dev(id->device); 1769 int addr_family = id->local_addr.ss_family; 1770 int rv = 0; 1771 1772 if (addr_family != AF_INET && addr_family != AF_INET6) 1773 return -EAFNOSUPPORT; 1774 1775 rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s); 1776 if (rv < 0) 1777 return rv; 1778 1779 /* 1780 * Allow binding local port when still in TIME_WAIT from last close. 1781 */ 1782 sock_set_reuseaddr(s->sk); 1783 1784 if (addr_family == AF_INET) { 1785 struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr); 1786 1787 /* For wildcard addr, limit binding to current device only */ 1788 if (ipv4_is_zeronet(laddr->sin_addr.s_addr)) 1789 s->sk->sk_bound_dev_if = sdev->netdev->ifindex; 1790 1791 rv = s->ops->bind(s, (struct sockaddr *)laddr, 1792 sizeof(struct sockaddr_in)); 1793 } else { 1794 struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr); 1795 1796 if (id->afonly) { 1797 rv = ip6_sock_set_v6only(s->sk); 1798 if (rv) { 1799 siw_dbg(id->device, 1800 "ip6_sock_set_v6only erro: %d\n", rv); 1801 goto error; 1802 } 1803 } 1804 1805 /* For wildcard addr, limit binding to current device only */ 1806 if (ipv6_addr_any(&laddr->sin6_addr)) 1807 s->sk->sk_bound_dev_if = sdev->netdev->ifindex; 1808 1809 rv = s->ops->bind(s, (struct sockaddr *)laddr, 1810 sizeof(struct sockaddr_in6)); 1811 } 1812 if (rv) { 1813 siw_dbg(id->device, "socket bind error: %d\n", rv); 1814 goto error; 1815 } 1816 cep = siw_cep_alloc(sdev); 1817 if (!cep) { 1818 rv = -ENOMEM; 1819 goto error; 1820 } 1821 siw_cep_socket_assoc(cep, s); 1822 1823 rv = siw_cm_alloc_work(cep, backlog); 1824 if (rv) { 1825 siw_dbg(id->device, 1826 "alloc_work error %d, backlog %d\n", 1827 rv, backlog); 1828 goto error; 1829 } 1830 rv = s->ops->listen(s, backlog); 1831 if (rv) { 1832 siw_dbg(id->device, "listen error %d\n", rv); 1833 goto error; 1834 } 1835 cep->cm_id = id; 1836 id->add_ref(id); 1837 1838 /* 1839 * In case of a wildcard rdma_listen on a multi-homed device, 1840 * a listener's IWCM id is associated with more than one listening CEP. 1841 * 1842 * We currently use id->provider_data in three different ways: 1843 * 1844 * o For a listener's IWCM id, id->provider_data points to 1845 * the list_head of the list of listening CEPs. 1846 * Uses: siw_create_listen(), siw_destroy_listen() 1847 * 1848 * o For each accepted passive-side IWCM id, id->provider_data 1849 * points to the CEP itself. This is a consequence of 1850 * - siw_cm_upcall() setting event.provider_data = cep and 1851 * - the IWCM's cm_conn_req_handler() setting provider_data of the 1852 * new passive-side IWCM id equal to event.provider_data 1853 * Uses: siw_accept(), siw_reject() 1854 * 1855 * o For an active-side IWCM id, id->provider_data is not used at all. 1856 * 1857 */ 1858 if (!id->provider_data) { 1859 id->provider_data = 1860 kmalloc(sizeof(struct list_head), GFP_KERNEL); 1861 if (!id->provider_data) { 1862 rv = -ENOMEM; 1863 goto error; 1864 } 1865 INIT_LIST_HEAD((struct list_head *)id->provider_data); 1866 } 1867 list_add_tail(&cep->listenq, (struct list_head *)id->provider_data); 1868 cep->state = SIW_EPSTATE_LISTENING; 1869 1870 siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr); 1871 1872 return 0; 1873 1874 error: 1875 siw_dbg(id->device, "failed: %d\n", rv); 1876 1877 if (cep) { 1878 siw_cep_set_inuse(cep); 1879 1880 if (cep->cm_id) { 1881 cep->cm_id->rem_ref(cep->cm_id); 1882 cep->cm_id = NULL; 1883 } 1884 cep->sock = NULL; 1885 siw_socket_disassoc(s); 1886 cep->state = SIW_EPSTATE_CLOSED; 1887 1888 siw_cep_set_free(cep); 1889 siw_cep_put(cep); 1890 } 1891 sock_release(s); 1892 1893 return rv; 1894 } 1895 1896 static void siw_drop_listeners(struct iw_cm_id *id) 1897 { 1898 struct list_head *p, *tmp; 1899 1900 /* 1901 * In case of a wildcard rdma_listen on a multi-homed device, 1902 * a listener's IWCM id is associated with more than one listening CEP. 1903 */ 1904 list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) { 1905 struct siw_cep *cep = list_entry(p, struct siw_cep, listenq); 1906 1907 list_del(p); 1908 1909 siw_dbg_cep(cep, "drop cep, state %d\n", cep->state); 1910 1911 siw_cep_set_inuse(cep); 1912 1913 if (cep->cm_id) { 1914 cep->cm_id->rem_ref(cep->cm_id); 1915 cep->cm_id = NULL; 1916 } 1917 if (cep->sock) { 1918 siw_socket_disassoc(cep->sock); 1919 sock_release(cep->sock); 1920 cep->sock = NULL; 1921 } 1922 cep->state = SIW_EPSTATE_CLOSED; 1923 siw_cep_set_free(cep); 1924 siw_cep_put(cep); 1925 } 1926 } 1927 1928 int siw_destroy_listen(struct iw_cm_id *id) 1929 { 1930 if (!id->provider_data) { 1931 siw_dbg(id->device, "no cep(s)\n"); 1932 return 0; 1933 } 1934 siw_drop_listeners(id); 1935 kfree(id->provider_data); 1936 id->provider_data = NULL; 1937 1938 return 0; 1939 } 1940 1941 int siw_cm_init(void) 1942 { 1943 /* 1944 * create_single_workqueue for strict ordering 1945 */ 1946 siw_cm_wq = create_singlethread_workqueue("siw_cm_wq"); 1947 if (!siw_cm_wq) 1948 return -ENOMEM; 1949 1950 return 0; 1951 } 1952 1953 void siw_cm_exit(void) 1954 { 1955 if (siw_cm_wq) 1956 destroy_workqueue(siw_cm_wq); 1957 } 1958