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) 729 goto out_err; 730 731 siw_cancel_mpatimer(cep); 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 if (rv != -EAGAIN) 899 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL); 900 901 return rv; 902} 903 904/* 905 * siw_accept_newconn - accept an incoming pending connection 906 * 907 */ 908static void siw_accept_newconn(struct siw_cep *cep) 909{ 910 struct socket *s = cep->sock; 911 struct socket *new_s = NULL; 912 struct siw_cep *new_cep = NULL; 913 int rv = 0; /* debug only. should disappear */ 914 915 if (cep->state != SIW_EPSTATE_LISTENING) 916 goto error; 917 918 new_cep = siw_cep_alloc(cep->sdev); 919 if (!new_cep) 920 goto error; 921 922 /* 923 * 4: Allocate a sufficient number of work elements 924 * to allow concurrent handling of local + peer close 925 * events, MPA header processing + MPA timeout. 926 */ 927 if (siw_cm_alloc_work(new_cep, 4) != 0) 928 goto error; 929 930 /* 931 * Copy saved socket callbacks from listening CEP 932 * and assign new socket with new CEP 933 */ 934 new_cep->sk_state_change = cep->sk_state_change; 935 new_cep->sk_data_ready = cep->sk_data_ready; 936 new_cep->sk_write_space = cep->sk_write_space; 937 new_cep->sk_error_report = cep->sk_error_report; 938 939 rv = kernel_accept(s, &new_s, O_NONBLOCK); 940 if (rv != 0) { 941 /* 942 * Connection already aborted by peer..? 943 */ 944 siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv); 945 goto error; 946 } 947 new_cep->sock = new_s; 948 siw_cep_get(new_cep); 949 new_s->sk->sk_user_data = new_cep; 950 951 if (siw_tcp_nagle == false) 952 tcp_sock_set_nodelay(new_s->sk); 953 new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ; 954 955 rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT); 956 if (rv) 957 goto error; 958 /* 959 * See siw_proc_mpareq() etc. for the use of new_cep->listen_cep. 960 */ 961 new_cep->listen_cep = cep; 962 siw_cep_get(cep); 963 964 if (atomic_read(&new_s->sk->sk_rmem_alloc)) { 965 /* 966 * MPA REQ already queued 967 */ 968 siw_dbg_cep(cep, "immediate mpa request\n"); 969 970 siw_cep_set_inuse(new_cep); 971 rv = siw_proc_mpareq(new_cep); 972 if (rv != -EAGAIN) { 973 siw_cep_put(cep); 974 new_cep->listen_cep = NULL; 975 if (rv) { 976 siw_cancel_mpatimer(new_cep); 977 siw_cep_set_free(new_cep); 978 goto error; 979 } 980 } 981 siw_cep_set_free(new_cep); 982 } 983 return; 984 985error: 986 if (new_cep) 987 siw_cep_put(new_cep); 988 989 if (new_s) { 990 siw_socket_disassoc(new_s); 991 sock_release(new_s); 992 new_cep->sock = NULL; 993 } 994 siw_dbg_cep(cep, "error %d\n", rv); 995} 996 997static void siw_cm_work_handler(struct work_struct *w) 998{ 999 struct siw_cm_work *work; 1000 struct siw_cep *cep; 1001 int release_cep = 0, rv = 0; 1002 1003 work = container_of(w, struct siw_cm_work, work.work); 1004 cep = work->cep; 1005 1006 siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n", 1007 cep->qp ? qp_id(cep->qp) : UINT_MAX, 1008 work->type, cep->state); 1009 1010 siw_cep_set_inuse(cep); 1011 1012 switch (work->type) { 1013 case SIW_CM_WORK_ACCEPT: 1014 siw_accept_newconn(cep); 1015 break; 1016 1017 case SIW_CM_WORK_READ_MPAHDR: 1018 if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { 1019 if (cep->listen_cep) { 1020 siw_cep_set_inuse(cep->listen_cep); 1021 1022 if (cep->listen_cep->state == 1023 SIW_EPSTATE_LISTENING) 1024 rv = siw_proc_mpareq(cep); 1025 else 1026 rv = -EFAULT; 1027 1028 siw_cep_set_free(cep->listen_cep); 1029 1030 if (rv != -EAGAIN) { 1031 siw_cep_put(cep->listen_cep); 1032 cep->listen_cep = NULL; 1033 if (rv) 1034 siw_cep_put(cep); 1035 } 1036 } 1037 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { 1038 rv = siw_proc_mpareply(cep); 1039 } else { 1040 /* 1041 * CEP already moved out of MPA handshake. 1042 * any connection management already done. 1043 * silently ignore the mpa packet. 1044 */ 1045 if (cep->state == SIW_EPSTATE_RDMA_MODE) { 1046 cep->sock->sk->sk_data_ready(cep->sock->sk); 1047 siw_dbg_cep(cep, "already in RDMA mode"); 1048 } else { 1049 siw_dbg_cep(cep, "out of state: %d\n", 1050 cep->state); 1051 } 1052 } 1053 if (rv && rv != EAGAIN) 1054 release_cep = 1; 1055 break; 1056 1057 case SIW_CM_WORK_CLOSE_LLP: 1058 /* 1059 * QP scheduled LLP close 1060 */ 1061 if (cep->qp && cep->qp->term_info.valid) 1062 siw_send_terminate(cep->qp); 1063 1064 if (cep->cm_id) 1065 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); 1066 1067 release_cep = 1; 1068 break; 1069 1070 case SIW_CM_WORK_PEER_CLOSE: 1071 if (cep->cm_id) { 1072 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { 1073 /* 1074 * MPA reply not received, but connection drop 1075 */ 1076 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 1077 -ECONNRESET); 1078 } else if (cep->state == SIW_EPSTATE_RDMA_MODE) { 1079 /* 1080 * NOTE: IW_CM_EVENT_DISCONNECT is given just 1081 * to transition IWCM into CLOSING. 1082 */ 1083 siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0); 1084 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); 1085 } 1086 /* 1087 * for other states there is no connection 1088 * known to the IWCM. 1089 */ 1090 } else { 1091 if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) { 1092 /* 1093 * Wait for the ulp/CM to call accept/reject 1094 */ 1095 siw_dbg_cep(cep, 1096 "mpa req recvd, wait for ULP\n"); 1097 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { 1098 /* 1099 * Socket close before MPA request received. 1100 */ 1101 if (cep->listen_cep) { 1102 siw_dbg_cep(cep, 1103 "no mpareq: drop listener\n"); 1104 siw_cep_put(cep->listen_cep); 1105 cep->listen_cep = NULL; 1106 } 1107 } 1108 } 1109 release_cep = 1; 1110 break; 1111 1112 case SIW_CM_WORK_MPATIMEOUT: 1113 cep->mpa_timer = NULL; 1114 1115 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { 1116 /* 1117 * MPA request timed out: 1118 * Hide any partially received private data and signal 1119 * timeout 1120 */ 1121 cep->mpa.hdr.params.pd_len = 0; 1122 1123 if (cep->cm_id) 1124 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 1125 -ETIMEDOUT); 1126 release_cep = 1; 1127 1128 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { 1129 /* 1130 * No MPA request received after peer TCP stream setup. 1131 */ 1132 if (cep->listen_cep) { 1133 siw_cep_put(cep->listen_cep); 1134 cep->listen_cep = NULL; 1135 } 1136 release_cep = 1; 1137 } 1138 break; 1139 1140 default: 1141 WARN(1, "Undefined CM work type: %d\n", work->type); 1142 } 1143 if (release_cep) { 1144 siw_dbg_cep(cep, 1145 "release: timer=%s, QP[%u]\n", 1146 cep->mpa_timer ? "y" : "n", 1147 cep->qp ? qp_id(cep->qp) : UINT_MAX); 1148 1149 siw_cancel_mpatimer(cep); 1150 1151 cep->state = SIW_EPSTATE_CLOSED; 1152 1153 if (cep->qp) { 1154 struct siw_qp *qp = cep->qp; 1155 /* 1156 * Serialize a potential race with application 1157 * closing the QP and calling siw_qp_cm_drop() 1158 */ 1159 siw_qp_get(qp); 1160 siw_cep_set_free(cep); 1161 1162 siw_qp_llp_close(qp); 1163 siw_qp_put(qp); 1164 1165 siw_cep_set_inuse(cep); 1166 cep->qp = NULL; 1167 siw_qp_put(qp); 1168 } 1169 if (cep->sock) { 1170 siw_socket_disassoc(cep->sock); 1171 sock_release(cep->sock); 1172 cep->sock = NULL; 1173 } 1174 if (cep->cm_id) { 1175 cep->cm_id->rem_ref(cep->cm_id); 1176 cep->cm_id = NULL; 1177 siw_cep_put(cep); 1178 } 1179 } 1180 siw_cep_set_free(cep); 1181 siw_put_work(work); 1182 siw_cep_put(cep); 1183} 1184 1185static struct workqueue_struct *siw_cm_wq; 1186 1187int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type) 1188{ 1189 struct siw_cm_work *work = siw_get_work(cep); 1190 unsigned long delay = 0; 1191 1192 if (!work) { 1193 siw_dbg_cep(cep, "failed with no work available\n"); 1194 return -ENOMEM; 1195 } 1196 work->type = type; 1197 work->cep = cep; 1198 1199 siw_cep_get(cep); 1200 1201 INIT_DELAYED_WORK(&work->work, siw_cm_work_handler); 1202 1203 if (type == SIW_CM_WORK_MPATIMEOUT) { 1204 cep->mpa_timer = work; 1205 1206 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) 1207 delay = MPAREQ_TIMEOUT; 1208 else 1209 delay = MPAREP_TIMEOUT; 1210 } 1211 siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n", 1212 cep->qp ? qp_id(cep->qp) : -1, type, delay); 1213 1214 queue_delayed_work(siw_cm_wq, &work->work, delay); 1215 1216 return 0; 1217} 1218 1219static void siw_cm_llp_data_ready(struct sock *sk) 1220{ 1221 struct siw_cep *cep; 1222 1223 read_lock(&sk->sk_callback_lock); 1224 1225 cep = sk_to_cep(sk); 1226 if (!cep) 1227 goto out; 1228 1229 siw_dbg_cep(cep, "cep state: %d, socket state %d\n", 1230 cep->state, sk->sk_state); 1231 1232 if (sk->sk_state != TCP_ESTABLISHED) 1233 goto out; 1234 1235 switch (cep->state) { 1236 case SIW_EPSTATE_RDMA_MODE: 1237 case SIW_EPSTATE_LISTENING: 1238 break; 1239 1240 case SIW_EPSTATE_AWAIT_MPAREQ: 1241 case SIW_EPSTATE_AWAIT_MPAREP: 1242 siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR); 1243 break; 1244 1245 default: 1246 siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state); 1247 break; 1248 } 1249out: 1250 read_unlock(&sk->sk_callback_lock); 1251} 1252 1253static void siw_cm_llp_write_space(struct sock *sk) 1254{ 1255 struct siw_cep *cep = sk_to_cep(sk); 1256 1257 if (cep) 1258 siw_dbg_cep(cep, "state: %d\n", cep->state); 1259} 1260 1261static void siw_cm_llp_error_report(struct sock *sk) 1262{ 1263 struct siw_cep *cep = sk_to_cep(sk); 1264 1265 if (cep) { 1266 siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n", 1267 sk->sk_err, sk->sk_state, cep->state); 1268 cep->sk_error_report(sk); 1269 } 1270} 1271 1272static void siw_cm_llp_state_change(struct sock *sk) 1273{ 1274 struct siw_cep *cep; 1275 void (*orig_state_change)(struct sock *s); 1276 1277 read_lock(&sk->sk_callback_lock); 1278 1279 cep = sk_to_cep(sk); 1280 if (!cep) { 1281 /* endpoint already disassociated */ 1282 read_unlock(&sk->sk_callback_lock); 1283 return; 1284 } 1285 orig_state_change = cep->sk_state_change; 1286 1287 siw_dbg_cep(cep, "state: %d\n", cep->state); 1288 1289 switch (sk->sk_state) { 1290 case TCP_ESTABLISHED: 1291 /* 1292 * handle accepting socket as special case where only 1293 * new connection is possible 1294 */ 1295 siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT); 1296 break; 1297 1298 case TCP_CLOSE: 1299 case TCP_CLOSE_WAIT: 1300 if (cep->qp) 1301 cep->qp->tx_ctx.tx_suspend = 1; 1302 siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE); 1303 break; 1304 1305 default: 1306 siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state); 1307 } 1308 read_unlock(&sk->sk_callback_lock); 1309 orig_state_change(sk); 1310} 1311 1312static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr, 1313 struct sockaddr *raddr) 1314{ 1315 int rv, flags = 0; 1316 size_t size = laddr->sa_family == AF_INET ? 1317 sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6); 1318 1319 /* 1320 * Make address available again asap. 1321 */ 1322 sock_set_reuseaddr(s->sk); 1323 1324 rv = s->ops->bind(s, laddr, size); 1325 if (rv < 0) 1326 return rv; 1327 1328 rv = s->ops->connect(s, raddr, size, flags); 1329 1330 return rv < 0 ? rv : 0; 1331} 1332 1333int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params) 1334{ 1335 struct siw_device *sdev = to_siw_dev(id->device); 1336 struct siw_qp *qp; 1337 struct siw_cep *cep = NULL; 1338 struct socket *s = NULL; 1339 struct sockaddr *laddr = (struct sockaddr *)&id->local_addr, 1340 *raddr = (struct sockaddr *)&id->remote_addr; 1341 bool p2p_mode = peer_to_peer, v4 = true; 1342 u16 pd_len = params->private_data_len; 1343 int version = mpa_version, rv; 1344 1345 if (pd_len > MPA_MAX_PRIVDATA) 1346 return -EINVAL; 1347 1348 if (params->ird > sdev->attrs.max_ird || 1349 params->ord > sdev->attrs.max_ord) 1350 return -ENOMEM; 1351 1352 if (laddr->sa_family == AF_INET6) 1353 v4 = false; 1354 else if (laddr->sa_family != AF_INET) 1355 return -EAFNOSUPPORT; 1356 1357 /* 1358 * Respect any iwarp port mapping: Use mapped remote address 1359 * if valid. Local address must not be mapped, since siw 1360 * uses kernel TCP stack. 1361 */ 1362 if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) || 1363 to_sockaddr_in6(id->remote_addr).sin6_port != 0) 1364 raddr = (struct sockaddr *)&id->m_remote_addr; 1365 1366 qp = siw_qp_id2obj(sdev, params->qpn); 1367 if (!qp) { 1368 WARN(1, "[QP %u] does not exist\n", params->qpn); 1369 rv = -EINVAL; 1370 goto error; 1371 } 1372 siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr, 1373 raddr); 1374 1375 rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s); 1376 if (rv < 0) 1377 goto error; 1378 1379 /* 1380 * NOTE: For simplification, connect() is called in blocking 1381 * mode. Might be reconsidered for async connection setup at 1382 * TCP level. 1383 */ 1384 rv = kernel_bindconnect(s, laddr, raddr); 1385 if (rv != 0) { 1386 siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv); 1387 goto error; 1388 } 1389 if (siw_tcp_nagle == false) 1390 tcp_sock_set_nodelay(s->sk); 1391 cep = siw_cep_alloc(sdev); 1392 if (!cep) { 1393 rv = -ENOMEM; 1394 goto error; 1395 } 1396 siw_cep_set_inuse(cep); 1397 1398 /* Associate QP with CEP */ 1399 siw_cep_get(cep); 1400 qp->cep = cep; 1401 1402 /* siw_qp_get(qp) already done by QP lookup */ 1403 cep->qp = qp; 1404 1405 id->add_ref(id); 1406 cep->cm_id = id; 1407 1408 /* 1409 * 4: Allocate a sufficient number of work elements 1410 * to allow concurrent handling of local + peer close 1411 * events, MPA header processing + MPA timeout. 1412 */ 1413 rv = siw_cm_alloc_work(cep, 4); 1414 if (rv != 0) { 1415 rv = -ENOMEM; 1416 goto error; 1417 } 1418 cep->ird = params->ird; 1419 cep->ord = params->ord; 1420 1421 if (p2p_mode && cep->ord == 0) 1422 cep->ord = 1; 1423 1424 cep->state = SIW_EPSTATE_CONNECTING; 1425 1426 /* 1427 * Associate CEP with socket 1428 */ 1429 siw_cep_socket_assoc(cep, s); 1430 1431 cep->state = SIW_EPSTATE_AWAIT_MPAREP; 1432 1433 /* 1434 * Set MPA Request bits: CRC if required, no MPA Markers, 1435 * MPA Rev. according to module parameter 'mpa_version', Key 'Request'. 1436 */ 1437 cep->mpa.hdr.params.bits = 0; 1438 if (version > MPA_REVISION_2) { 1439 pr_warn("Setting MPA version to %u\n", MPA_REVISION_2); 1440 version = MPA_REVISION_2; 1441 /* Adjust also module parameter */ 1442 mpa_version = MPA_REVISION_2; 1443 } 1444 __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version); 1445 1446 if (try_gso) 1447 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP; 1448 1449 if (mpa_crc_required) 1450 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC; 1451 1452 /* 1453 * If MPA version == 2: 1454 * o Include ORD and IRD. 1455 * o Indicate peer-to-peer mode, if required by module 1456 * parameter 'peer_to_peer'. 1457 */ 1458 if (version == MPA_REVISION_2) { 1459 cep->enhanced_rdma_conn_est = true; 1460 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED; 1461 1462 cep->mpa.v2_ctrl.ird = htons(cep->ird); 1463 cep->mpa.v2_ctrl.ord = htons(cep->ord); 1464 1465 if (p2p_mode) { 1466 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER; 1467 cep->mpa.v2_ctrl.ord |= rtr_type; 1468 } 1469 /* Remember own P2P mode requested */ 1470 cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird; 1471 cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord; 1472 } 1473 memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16); 1474 1475 rv = siw_send_mpareqrep(cep, params->private_data, pd_len); 1476 /* 1477 * Reset private data. 1478 */ 1479 cep->mpa.hdr.params.pd_len = 0; 1480 1481 if (rv >= 0) { 1482 rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT); 1483 if (!rv) { 1484 siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp)); 1485 siw_cep_set_free(cep); 1486 return 0; 1487 } 1488 } 1489error: 1490 siw_dbg(id->device, "failed: %d\n", rv); 1491 1492 if (cep) { 1493 siw_socket_disassoc(s); 1494 sock_release(s); 1495 cep->sock = NULL; 1496 1497 cep->qp = NULL; 1498 1499 cep->cm_id = NULL; 1500 id->rem_ref(id); 1501 1502 qp->cep = NULL; 1503 siw_cep_put(cep); 1504 1505 cep->state = SIW_EPSTATE_CLOSED; 1506 1507 siw_cep_set_free(cep); 1508 1509 siw_cep_put(cep); 1510 1511 } else if (s) { 1512 sock_release(s); 1513 } 1514 if (qp) 1515 siw_qp_put(qp); 1516 1517 return rv; 1518} 1519 1520/* 1521 * siw_accept - Let SoftiWARP accept an RDMA connection request 1522 * 1523 * @id: New connection management id to be used for accepted 1524 * connection request 1525 * @params: Connection parameters provided by ULP for accepting connection 1526 * 1527 * Transition QP to RTS state, associate new CM id @id with accepted CEP 1528 * and get prepared for TCP input by installing socket callbacks. 1529 * Then send MPA Reply and generate the "connection established" event. 1530 * Socket callbacks must be installed before sending MPA Reply, because 1531 * the latter may cause a first RDMA message to arrive from the RDMA Initiator 1532 * side very quickly, at which time the socket callbacks must be ready. 1533 */ 1534int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params) 1535{ 1536 struct siw_device *sdev = to_siw_dev(id->device); 1537 struct siw_cep *cep = (struct siw_cep *)id->provider_data; 1538 struct siw_qp *qp; 1539 struct siw_qp_attrs qp_attrs; 1540 int rv, max_priv_data = MPA_MAX_PRIVDATA; 1541 bool wait_for_peer_rts = false; 1542 1543 siw_cep_set_inuse(cep); 1544 siw_cep_put(cep); 1545 1546 /* Free lingering inbound private data */ 1547 if (cep->mpa.hdr.params.pd_len) { 1548 cep->mpa.hdr.params.pd_len = 0; 1549 kfree(cep->mpa.pdata); 1550 cep->mpa.pdata = NULL; 1551 } 1552 siw_cancel_mpatimer(cep); 1553 1554 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) { 1555 siw_dbg_cep(cep, "out of state\n"); 1556 1557 siw_cep_set_free(cep); 1558 siw_cep_put(cep); 1559 1560 return -ECONNRESET; 1561 } 1562 qp = siw_qp_id2obj(sdev, params->qpn); 1563 if (!qp) { 1564 WARN(1, "[QP %d] does not exist\n", params->qpn); 1565 siw_cep_set_free(cep); 1566 siw_cep_put(cep); 1567 1568 return -EINVAL; 1569 } 1570 down_write(&qp->state_lock); 1571 if (qp->attrs.state > SIW_QP_STATE_RTR) { 1572 rv = -EINVAL; 1573 up_write(&qp->state_lock); 1574 goto error; 1575 } 1576 siw_dbg_cep(cep, "[QP %d]\n", params->qpn); 1577 1578 if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) { 1579 siw_dbg_cep(cep, "peer allows GSO on TX\n"); 1580 qp->tx_ctx.gso_seg_limit = 0; 1581 } 1582 if (params->ord > sdev->attrs.max_ord || 1583 params->ird > sdev->attrs.max_ird) { 1584 siw_dbg_cep( 1585 cep, 1586 "[QP %u]: ord %d (max %d), ird %d (max %d)\n", 1587 qp_id(qp), params->ord, sdev->attrs.max_ord, 1588 params->ird, sdev->attrs.max_ird); 1589 rv = -EINVAL; 1590 up_write(&qp->state_lock); 1591 goto error; 1592 } 1593 if (cep->enhanced_rdma_conn_est) 1594 max_priv_data -= sizeof(struct mpa_v2_data); 1595 1596 if (params->private_data_len > max_priv_data) { 1597 siw_dbg_cep( 1598 cep, 1599 "[QP %u]: private data length: %d (max %d)\n", 1600 qp_id(qp), params->private_data_len, max_priv_data); 1601 rv = -EINVAL; 1602 up_write(&qp->state_lock); 1603 goto error; 1604 } 1605 if (cep->enhanced_rdma_conn_est) { 1606 if (params->ord > cep->ord) { 1607 if (relaxed_ird_negotiation) { 1608 params->ord = cep->ord; 1609 } else { 1610 cep->ird = params->ird; 1611 cep->ord = params->ord; 1612 rv = -EINVAL; 1613 up_write(&qp->state_lock); 1614 goto error; 1615 } 1616 } 1617 if (params->ird < cep->ird) { 1618 if (relaxed_ird_negotiation && 1619 cep->ird <= sdev->attrs.max_ird) 1620 params->ird = cep->ird; 1621 else { 1622 rv = -ENOMEM; 1623 up_write(&qp->state_lock); 1624 goto error; 1625 } 1626 } 1627 if (cep->mpa.v2_ctrl.ord & 1628 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR)) 1629 wait_for_peer_rts = true; 1630 /* 1631 * Signal back negotiated IRD and ORD values 1632 */ 1633 cep->mpa.v2_ctrl.ord = 1634 htons(params->ord & MPA_IRD_ORD_MASK) | 1635 (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD); 1636 cep->mpa.v2_ctrl.ird = 1637 htons(params->ird & MPA_IRD_ORD_MASK) | 1638 (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD); 1639 } 1640 cep->ird = params->ird; 1641 cep->ord = params->ord; 1642 1643 cep->cm_id = id; 1644 id->add_ref(id); 1645 1646 memset(&qp_attrs, 0, sizeof(qp_attrs)); 1647 qp_attrs.orq_size = cep->ord; 1648 qp_attrs.irq_size = cep->ird; 1649 qp_attrs.sk = cep->sock; 1650 if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC) 1651 qp_attrs.flags = SIW_MPA_CRC; 1652 qp_attrs.state = SIW_QP_STATE_RTS; 1653 1654 siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp)); 1655 1656 /* Associate QP with CEP */ 1657 siw_cep_get(cep); 1658 qp->cep = cep; 1659 1660 /* siw_qp_get(qp) already done by QP lookup */ 1661 cep->qp = qp; 1662 1663 cep->state = SIW_EPSTATE_RDMA_MODE; 1664 1665 /* Move socket RX/TX under QP control */ 1666 rv = siw_qp_modify(qp, &qp_attrs, 1667 SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE | 1668 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | 1669 SIW_QP_ATTR_MPA); 1670 up_write(&qp->state_lock); 1671 1672 if (rv) 1673 goto error; 1674 1675 siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n", 1676 qp_id(qp), params->private_data_len); 1677 1678 rv = siw_send_mpareqrep(cep, params->private_data, 1679 params->private_data_len); 1680 if (rv != 0) 1681 goto error; 1682 1683 if (wait_for_peer_rts) { 1684 siw_sk_assign_rtr_upcalls(cep); 1685 } else { 1686 siw_qp_socket_assoc(cep, qp); 1687 rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0); 1688 if (rv) 1689 goto error; 1690 } 1691 siw_cep_set_free(cep); 1692 1693 return 0; 1694error: 1695 siw_socket_disassoc(cep->sock); 1696 sock_release(cep->sock); 1697 cep->sock = NULL; 1698 1699 cep->state = SIW_EPSTATE_CLOSED; 1700 1701 if (cep->cm_id) { 1702 cep->cm_id->rem_ref(id); 1703 cep->cm_id = NULL; 1704 } 1705 if (qp->cep) { 1706 siw_cep_put(cep); 1707 qp->cep = NULL; 1708 } 1709 cep->qp = NULL; 1710 siw_qp_put(qp); 1711 1712 siw_cep_set_free(cep); 1713 siw_cep_put(cep); 1714 1715 return rv; 1716} 1717 1718/* 1719 * siw_reject() 1720 * 1721 * Local connection reject case. Send private data back to peer, 1722 * close connection and dereference connection id. 1723 */ 1724int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len) 1725{ 1726 struct siw_cep *cep = (struct siw_cep *)id->provider_data; 1727 1728 siw_cep_set_inuse(cep); 1729 siw_cep_put(cep); 1730 1731 siw_cancel_mpatimer(cep); 1732 1733 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) { 1734 siw_dbg_cep(cep, "out of state\n"); 1735 1736 siw_cep_set_free(cep); 1737 siw_cep_put(cep); /* put last reference */ 1738 1739 return -ECONNRESET; 1740 } 1741 siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state, 1742 pd_len); 1743 1744 if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) { 1745 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */ 1746 siw_send_mpareqrep(cep, pdata, pd_len); 1747 } 1748 siw_socket_disassoc(cep->sock); 1749 sock_release(cep->sock); 1750 cep->sock = NULL; 1751 1752 cep->state = SIW_EPSTATE_CLOSED; 1753 1754 siw_cep_set_free(cep); 1755 siw_cep_put(cep); 1756 1757 return 0; 1758} 1759 1760/* 1761 * siw_create_listen - Create resources for a listener's IWCM ID @id 1762 * 1763 * Starts listen on the socket address id->local_addr. 1764 * 1765 */ 1766int siw_create_listen(struct iw_cm_id *id, int backlog) 1767{ 1768 struct socket *s; 1769 struct siw_cep *cep = NULL; 1770 struct siw_device *sdev = to_siw_dev(id->device); 1771 int addr_family = id->local_addr.ss_family; 1772 int rv = 0; 1773 1774 if (addr_family != AF_INET && addr_family != AF_INET6) 1775 return -EAFNOSUPPORT; 1776 1777 rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s); 1778 if (rv < 0) 1779 return rv; 1780 1781 /* 1782 * Allow binding local port when still in TIME_WAIT from last close. 1783 */ 1784 sock_set_reuseaddr(s->sk); 1785 1786 if (addr_family == AF_INET) { 1787 struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr); 1788 1789 /* For wildcard addr, limit binding to current device only */ 1790 if (ipv4_is_zeronet(laddr->sin_addr.s_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_in)); 1795 } else { 1796 struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr); 1797 1798 /* For wildcard addr, limit binding to current device only */ 1799 if (ipv6_addr_any(&laddr->sin6_addr)) 1800 s->sk->sk_bound_dev_if = sdev->netdev->ifindex; 1801 1802 rv = s->ops->bind(s, (struct sockaddr *)laddr, 1803 sizeof(struct sockaddr_in6)); 1804 } 1805 if (rv) { 1806 siw_dbg(id->device, "socket bind error: %d\n", rv); 1807 goto error; 1808 } 1809 cep = siw_cep_alloc(sdev); 1810 if (!cep) { 1811 rv = -ENOMEM; 1812 goto error; 1813 } 1814 siw_cep_socket_assoc(cep, s); 1815 1816 rv = siw_cm_alloc_work(cep, backlog); 1817 if (rv) { 1818 siw_dbg(id->device, 1819 "alloc_work error %d, backlog %d\n", 1820 rv, backlog); 1821 goto error; 1822 } 1823 rv = s->ops->listen(s, backlog); 1824 if (rv) { 1825 siw_dbg(id->device, "listen error %d\n", rv); 1826 goto error; 1827 } 1828 cep->cm_id = id; 1829 id->add_ref(id); 1830 1831 /* 1832 * In case of a wildcard rdma_listen on a multi-homed device, 1833 * a listener's IWCM id is associated with more than one listening CEP. 1834 * 1835 * We currently use id->provider_data in three different ways: 1836 * 1837 * o For a listener's IWCM id, id->provider_data points to 1838 * the list_head of the list of listening CEPs. 1839 * Uses: siw_create_listen(), siw_destroy_listen() 1840 * 1841 * o For each accepted passive-side IWCM id, id->provider_data 1842 * points to the CEP itself. This is a consequence of 1843 * - siw_cm_upcall() setting event.provider_data = cep and 1844 * - the IWCM's cm_conn_req_handler() setting provider_data of the 1845 * new passive-side IWCM id equal to event.provider_data 1846 * Uses: siw_accept(), siw_reject() 1847 * 1848 * o For an active-side IWCM id, id->provider_data is not used at all. 1849 * 1850 */ 1851 if (!id->provider_data) { 1852 id->provider_data = 1853 kmalloc(sizeof(struct list_head), GFP_KERNEL); 1854 if (!id->provider_data) { 1855 rv = -ENOMEM; 1856 goto error; 1857 } 1858 INIT_LIST_HEAD((struct list_head *)id->provider_data); 1859 } 1860 list_add_tail(&cep->listenq, (struct list_head *)id->provider_data); 1861 cep->state = SIW_EPSTATE_LISTENING; 1862 1863 siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr); 1864 1865 return 0; 1866 1867error: 1868 siw_dbg(id->device, "failed: %d\n", rv); 1869 1870 if (cep) { 1871 siw_cep_set_inuse(cep); 1872 1873 if (cep->cm_id) { 1874 cep->cm_id->rem_ref(cep->cm_id); 1875 cep->cm_id = NULL; 1876 } 1877 cep->sock = NULL; 1878 siw_socket_disassoc(s); 1879 cep->state = SIW_EPSTATE_CLOSED; 1880 1881 siw_cep_set_free(cep); 1882 siw_cep_put(cep); 1883 } 1884 sock_release(s); 1885 1886 return rv; 1887} 1888 1889static void siw_drop_listeners(struct iw_cm_id *id) 1890{ 1891 struct list_head *p, *tmp; 1892 1893 /* 1894 * In case of a wildcard rdma_listen on a multi-homed device, 1895 * a listener's IWCM id is associated with more than one listening CEP. 1896 */ 1897 list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) { 1898 struct siw_cep *cep = list_entry(p, struct siw_cep, listenq); 1899 1900 list_del(p); 1901 1902 siw_dbg_cep(cep, "drop cep, state %d\n", cep->state); 1903 1904 siw_cep_set_inuse(cep); 1905 1906 if (cep->cm_id) { 1907 cep->cm_id->rem_ref(cep->cm_id); 1908 cep->cm_id = NULL; 1909 } 1910 if (cep->sock) { 1911 siw_socket_disassoc(cep->sock); 1912 sock_release(cep->sock); 1913 cep->sock = NULL; 1914 } 1915 cep->state = SIW_EPSTATE_CLOSED; 1916 siw_cep_set_free(cep); 1917 siw_cep_put(cep); 1918 } 1919} 1920 1921int siw_destroy_listen(struct iw_cm_id *id) 1922{ 1923 if (!id->provider_data) { 1924 siw_dbg(id->device, "no cep(s)\n"); 1925 return 0; 1926 } 1927 siw_drop_listeners(id); 1928 kfree(id->provider_data); 1929 id->provider_data = NULL; 1930 1931 return 0; 1932} 1933 1934int siw_cm_init(void) 1935{ 1936 /* 1937 * create_single_workqueue for strict ordering 1938 */ 1939 siw_cm_wq = create_singlethread_workqueue("siw_cm_wq"); 1940 if (!siw_cm_wq) 1941 return -ENOMEM; 1942 1943 return 0; 1944} 1945 1946void siw_cm_exit(void) 1947{ 1948 if (siw_cm_wq) { 1949 flush_workqueue(siw_cm_wq); 1950 destroy_workqueue(siw_cm_wq); 1951 } 1952} 1953