drivers/infiniband/sw/siw/siw_qp.c

   1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2
   3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
   4 /* Copyright (c) 2008-2019, IBM Corporation */
   5
   6 #include <linux/errno.h>
   7 #include <linux/types.h>
   8 #include <linux/net.h>
   9 #include <linux/scatterlist.h>
  10 #include <linux/llist.h>
  11 #include <asm/barrier.h>
  12 #include <net/tcp.h>
  13
  14 #include "siw.h"
  15 #include "siw_verbs.h"
  16 #include "siw_mem.h"
  17
  18 static char siw_qp_state_to_string[SIW_QP_STATE_COUNT][sizeof "TERMINATE"] = {
  19         [SIW_QP_STATE_IDLE] = "IDLE",
  20         [SIW_QP_STATE_RTR] = "RTR",
  21         [SIW_QP_STATE_RTS] = "RTS",
  22         [SIW_QP_STATE_CLOSING] = "CLOSING",
  23         [SIW_QP_STATE_TERMINATE] = "TERMINATE",
  24         [SIW_QP_STATE_ERROR] = "ERROR"
  25 };
  26
  27 /*
  28  * iWARP (RDMAP, DDP and MPA) parameters as well as Softiwarp settings on a
  29  * per-RDMAP message basis. Please keep order of initializer. All MPA len
  30  * is initialized to minimum packet size.
  31  */
  32 struct iwarp_msg_info iwarp_pktinfo[RDMAP_TERMINATE + 1] = {
  33         { /* RDMAP_RDMA_WRITE */
  34           .hdr_len = sizeof(struct iwarp_rdma_write),
  35           .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_write) - 2),
  36           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_TAGGED | DDP_FLAG_LAST |
  37                                  cpu_to_be16(DDP_VERSION << 8) |
  38                                  cpu_to_be16(RDMAP_VERSION << 6) |
  39                                  cpu_to_be16(RDMAP_RDMA_WRITE),
  40           .rx_data = siw_proc_write },
  41         { /* RDMAP_RDMA_READ_REQ */
  42           .hdr_len = sizeof(struct iwarp_rdma_rreq),
  43           .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_rreq) - 2),
  44           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
  45                                  cpu_to_be16(RDMAP_VERSION << 6) |
  46                                  cpu_to_be16(RDMAP_RDMA_READ_REQ),
  47           .rx_data = siw_proc_rreq },
  48         { /* RDMAP_RDMA_READ_RESP */
  49           .hdr_len = sizeof(struct iwarp_rdma_rresp),
  50           .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_rresp) - 2),
  51           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_TAGGED | DDP_FLAG_LAST |
  52                                  cpu_to_be16(DDP_VERSION << 8) |
  53                                  cpu_to_be16(RDMAP_VERSION << 6) |
  54                                  cpu_to_be16(RDMAP_RDMA_READ_RESP),
  55           .rx_data = siw_proc_rresp },
  56         { /* RDMAP_SEND */
  57           .hdr_len = sizeof(struct iwarp_send),
  58           .ctrl.mpa_len = htons(sizeof(struct iwarp_send) - 2),
  59           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
  60                                  cpu_to_be16(RDMAP_VERSION << 6) |
  61                                  cpu_to_be16(RDMAP_SEND),
  62           .rx_data = siw_proc_send },
  63         { /* RDMAP_SEND_INVAL */
  64           .hdr_len = sizeof(struct iwarp_send_inv),
  65           .ctrl.mpa_len = htons(sizeof(struct iwarp_send_inv) - 2),
  66           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
  67                                  cpu_to_be16(RDMAP_VERSION << 6) |
  68                                  cpu_to_be16(RDMAP_SEND_INVAL),
  69           .rx_data = siw_proc_send },
  70         { /* RDMAP_SEND_SE */
  71           .hdr_len = sizeof(struct iwarp_send),
  72           .ctrl.mpa_len = htons(sizeof(struct iwarp_send) - 2),
  73           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
  74                                  cpu_to_be16(RDMAP_VERSION << 6) |
  75                                  cpu_to_be16(RDMAP_SEND_SE),
  76           .rx_data = siw_proc_send },
  77         { /* RDMAP_SEND_SE_INVAL */
  78           .hdr_len = sizeof(struct iwarp_send_inv),
  79           .ctrl.mpa_len = htons(sizeof(struct iwarp_send_inv) - 2),
  80           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
  81                                  cpu_to_be16(RDMAP_VERSION << 6) |
  82                                  cpu_to_be16(RDMAP_SEND_SE_INVAL),
  83           .rx_data = siw_proc_send },
  84         { /* RDMAP_TERMINATE */
  85           .hdr_len = sizeof(struct iwarp_terminate),
  86           .ctrl.mpa_len = htons(sizeof(struct iwarp_terminate) - 2),
  87           .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
  88                                  cpu_to_be16(RDMAP_VERSION << 6) |
  89                                  cpu_to_be16(RDMAP_TERMINATE),
  90           .rx_data = siw_proc_terminate }
  91 };
  92
  93 void siw_qp_llp_data_ready(struct sock *sk)
  94 {
  95         struct siw_qp *qp;
  96
  97         read_lock(&sk->sk_callback_lock);
  98
  99         if (unlikely(!sk->sk_user_data || !sk_to_qp(sk)))
 100                 goto done;
 101
 102         qp = sk_to_qp(sk);
 103
 104         if (likely(!qp->rx_stream.rx_suspend &&
 105                    down_read_trylock(&qp->state_lock))) {
 106                 read_descriptor_t rd_desc = { .arg.data = qp, .count = 1 };
 107
 108                 if (likely(qp->attrs.state == SIW_QP_STATE_RTS))
 109                         /*
 110                          * Implements data receive operation during
 111                          * socket callback. TCP gracefully catches
 112                          * the case where there is nothing to receive
 113                          * (not calling siw_tcp_rx_data() then).
 114                          */
 115                         tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
 116
 117                 up_read(&qp->state_lock);
 118         } else {
 119                 siw_dbg_qp(qp, "unable to process RX, suspend: %d\n",
 120                            qp->rx_stream.rx_suspend);
 121         }
 122 done:
 123         read_unlock(&sk->sk_callback_lock);
 124 }
 125
 126 void siw_qp_llp_close(struct siw_qp *qp)
 127 {
 128         siw_dbg_qp(qp, "enter llp close, state = %s\n",
 129                    siw_qp_state_to_string[qp->attrs.state]);
 130
 131         down_write(&qp->state_lock);
 132
 133         qp->rx_stream.rx_suspend = 1;
 134         qp->tx_ctx.tx_suspend = 1;
 135         qp->attrs.sk = NULL;
 136
 137         switch (qp->attrs.state) {
 138         case SIW_QP_STATE_RTS:
 139         case SIW_QP_STATE_RTR:
 140         case SIW_QP_STATE_IDLE:
 141         case SIW_QP_STATE_TERMINATE:
 142                 qp->attrs.state = SIW_QP_STATE_ERROR;
 143                 break;
 144         /*
 145          * SIW_QP_STATE_CLOSING:
 146          *
 147          * This is a forced close. shall the QP be moved to
 148          * ERROR or IDLE ?
 149          */
 150         case SIW_QP_STATE_CLOSING:
 151                 if (tx_wqe(qp)->wr_status == SIW_WR_IDLE)
 152                         qp->attrs.state = SIW_QP_STATE_ERROR;
 153                 else
 154                         qp->attrs.state = SIW_QP_STATE_IDLE;
 155                 break;
 156
 157         default:
 158                 siw_dbg_qp(qp, "llp close: no state transition needed: %s\n",
 159                            siw_qp_state_to_string[qp->attrs.state]);
 160                 break;
 161         }
 162         siw_sq_flush(qp);
 163         siw_rq_flush(qp);
 164
 165         /*
 166          * Dereference closing CEP
 167          */
 168         if (qp->cep) {
 169                 siw_cep_put(qp->cep);
 170                 qp->cep = NULL;
 171         }
 172
 173         up_write(&qp->state_lock);
 174
 175         siw_dbg_qp(qp, "llp close exit: state %s\n",
 176                    siw_qp_state_to_string[qp->attrs.state]);
 177 }
 178
 179 /*
 180  * socket callback routine informing about newly available send space.
 181  * Function schedules SQ work for processing SQ items.
 182  */
 183 void siw_qp_llp_write_space(struct sock *sk)
 184 {
 185         struct siw_cep *cep = sk_to_cep(sk);
 186
 187         cep->sk_write_space(sk);
 188
 189         if (!test_bit(SOCK_NOSPACE, &sk->sk_socket->flags))
 190                 (void)siw_sq_start(cep->qp);
 191 }
 192
 193 static int siw_qp_readq_init(struct siw_qp *qp, int irq_size, int orq_size)
 194 {
 195         irq_size = roundup_pow_of_two(irq_size);
 196         orq_size = roundup_pow_of_two(orq_size);
 197
 198         qp->attrs.irq_size = irq_size;
 199         qp->attrs.orq_size = orq_size;
 200
 201         qp->irq = vzalloc(irq_size * sizeof(struct siw_sqe));
 202         if (!qp->irq) {
 203                 siw_dbg_qp(qp, "irq malloc for %d failed\n", irq_size);
 204                 qp->attrs.irq_size = 0;
 205                 return -ENOMEM;
 206         }
 207         qp->orq = vzalloc(orq_size * sizeof(struct siw_sqe));
 208         if (!qp->orq) {
 209                 siw_dbg_qp(qp, "orq malloc for %d failed\n", orq_size);
 210                 qp->attrs.orq_size = 0;
 211                 qp->attrs.irq_size = 0;
 212                 vfree(qp->irq);
 213                 return -ENOMEM;
 214         }
 215         siw_dbg_qp(qp, "ORD %d, IRD %d\n", orq_size, irq_size);
 216         return 0;
 217 }
 218
 219 static int siw_qp_enable_crc(struct siw_qp *qp)
 220 {
 221         struct siw_rx_stream *c_rx = &qp->rx_stream;
 222         struct siw_iwarp_tx *c_tx = &qp->tx_ctx;
 223         int size = crypto_shash_descsize(siw_crypto_shash) +
 224                         sizeof(struct shash_desc);
 225
 226         if (siw_crypto_shash == NULL)
 227                 return -ENOENT;
 228
 229         c_tx->mpa_crc_hd = kzalloc(size, GFP_KERNEL);
 230         c_rx->mpa_crc_hd = kzalloc(size, GFP_KERNEL);
 231         if (!c_tx->mpa_crc_hd || !c_rx->mpa_crc_hd) {
 232                 kfree(c_tx->mpa_crc_hd);
 233                 kfree(c_rx->mpa_crc_hd);
 234                 c_tx->mpa_crc_hd = NULL;
 235                 c_rx->mpa_crc_hd = NULL;
 236                 return -ENOMEM;
 237         }
 238         c_tx->mpa_crc_hd->tfm = siw_crypto_shash;
 239         c_rx->mpa_crc_hd->tfm = siw_crypto_shash;
 240
 241         return 0;
 242 }
 243
 244 /*
 245  * Send a non signalled READ or WRITE to peer side as negotiated
 246  * with MPAv2 P2P setup protocol. The work request is only created
 247  * as a current active WR and does not consume Send Queue space.
 248  *
 249  * Caller must hold QP state lock.
 250  */
 251 int siw_qp_mpa_rts(struct siw_qp *qp, enum mpa_v2_ctrl ctrl)
 252 {
 253         struct siw_wqe *wqe = tx_wqe(qp);
 254         unsigned long flags;
 255         int rv = 0;
 256
 257         spin_lock_irqsave(&qp->sq_lock, flags);
 258
 259         if (unlikely(wqe->wr_status != SIW_WR_IDLE)) {
 260                 spin_unlock_irqrestore(&qp->sq_lock, flags);
 261                 return -EIO;
 262         }
 263         memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
 264
 265         wqe->wr_status = SIW_WR_QUEUED;
 266         wqe->sqe.flags = 0;
 267         wqe->sqe.num_sge = 1;
 268         wqe->sqe.sge[0].length = 0;
 269         wqe->sqe.sge[0].laddr = 0;
 270         wqe->sqe.sge[0].lkey = 0;
 271         /*
 272          * While it must not be checked for inbound zero length
 273          * READ/WRITE, some HW may treat STag 0 special.
 274          */
 275         wqe->sqe.rkey = 1;
 276         wqe->sqe.raddr = 0;
 277         wqe->processed = 0;
 278
 279         if (ctrl & MPA_V2_RDMA_WRITE_RTR)
 280                 wqe->sqe.opcode = SIW_OP_WRITE;
 281         else if (ctrl & MPA_V2_RDMA_READ_RTR) {
 282                 struct siw_sqe *rreq;
 283
 284                 wqe->sqe.opcode = SIW_OP_READ;
 285
 286                 spin_lock(&qp->orq_lock);
 287
 288                 rreq = orq_get_free(qp);
 289                 if (rreq) {
 290                         siw_read_to_orq(rreq, &wqe->sqe);
 291                         qp->orq_put++;
 292                 } else
 293                         rv = -EIO;
 294
 295                 spin_unlock(&qp->orq_lock);
 296         } else
 297                 rv = -EINVAL;
 298
 299         if (rv)
 300                 wqe->wr_status = SIW_WR_IDLE;
 301
 302         spin_unlock_irqrestore(&qp->sq_lock, flags);
 303
 304         if (!rv)
 305                 rv = siw_sq_start(qp);
 306
 307         return rv;
 308 }
 309
 310 /*
 311  * Map memory access error to DDP tagged error
 312  */
 313 enum ddp_ecode siw_tagged_error(enum siw_access_state state)
 314 {
 315         switch (state) {
 316         case E_STAG_INVALID:
 317                 return DDP_ECODE_T_INVALID_STAG;
 318         case E_BASE_BOUNDS:
 319                 return DDP_ECODE_T_BASE_BOUNDS;
 320         case E_PD_MISMATCH:
 321                 return DDP_ECODE_T_STAG_NOT_ASSOC;
 322         case E_ACCESS_PERM:
 323                 /*
 324                  * RFC 5041 (DDP) lacks an ecode for insufficient access
 325                  * permissions. 'Invalid STag' seem to be the closest
 326                  * match though.
 327                  */
 328                 return DDP_ECODE_T_INVALID_STAG;
 329         default:
 330                 WARN_ON(1);
 331                 return DDP_ECODE_T_INVALID_STAG;
 332         }
 333 }
 334
 335 /*
 336  * Map memory access error to RDMAP protection error
 337  */
 338 enum rdmap_ecode siw_rdmap_error(enum siw_access_state state)
 339 {
 340         switch (state) {
 341         case E_STAG_INVALID:
 342                 return RDMAP_ECODE_INVALID_STAG;
 343         case E_BASE_BOUNDS:
 344                 return RDMAP_ECODE_BASE_BOUNDS;
 345         case E_PD_MISMATCH:
 346                 return RDMAP_ECODE_STAG_NOT_ASSOC;
 347         case E_ACCESS_PERM:
 348                 return RDMAP_ECODE_ACCESS_RIGHTS;
 349         default:
 350                 return RDMAP_ECODE_UNSPECIFIED;
 351         }
 352 }
 353
 354 void siw_init_terminate(struct siw_qp *qp, enum term_elayer layer, u8 etype,
 355                         u8 ecode, int in_tx)
 356 {
 357         if (!qp->term_info.valid) {
 358                 memset(&qp->term_info, 0, sizeof(qp->term_info));
 359                 qp->term_info.layer = layer;
 360                 qp->term_info.etype = etype;
 361                 qp->term_info.ecode = ecode;
 362                 qp->term_info.in_tx = in_tx;
 363                 qp->term_info.valid = 1;
 364         }
 365         siw_dbg_qp(qp, "init TERM: layer %d, type %d, code %d, in tx %s\n",
 366                    layer, etype, ecode, in_tx ? "yes" : "no");
 367 }
 368
 369 /*
 370  * Send a TERMINATE message, as defined in RFC's 5040/5041/5044/6581.
 371  * Sending TERMINATE messages is best effort - such messages
 372  * can only be send if the QP is still connected and it does
 373  * not have another outbound message in-progress, i.e. the
 374  * TERMINATE message must not interfer with an incomplete current
 375  * transmit operation.
 376  */
 377 void siw_send_terminate(struct siw_qp *qp)
 378 {
 379         struct kvec iov[3];
 380         struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_EOR };
 381         struct iwarp_terminate *term = NULL;
 382         union iwarp_hdr *err_hdr = NULL;
 383         struct socket *s = qp->attrs.sk;
 384         struct siw_rx_stream *srx = &qp->rx_stream;
 385         union iwarp_hdr *rx_hdr = &srx->hdr;
 386         u32 crc = 0;
 387         int num_frags, len_terminate, rv;
 388
 389         if (!qp->term_info.valid)
 390                 return;
 391
 392         qp->term_info.valid = 0;
 393
 394         if (tx_wqe(qp)->wr_status == SIW_WR_INPROGRESS) {
 395                 siw_dbg_qp(qp, "cannot send TERMINATE: op %d in progress\n",
 396                            tx_type(tx_wqe(qp)));
 397                 return;
 398         }
 399         if (!s && qp->cep)
 400                 /* QP not yet in RTS. Take socket from connection end point */
 401                 s = qp->cep->sock;
 402
 403         if (!s) {
 404                 siw_dbg_qp(qp, "cannot send TERMINATE: not connected\n");
 405                 return;
 406         }
 407
 408         term = kzalloc(sizeof(*term), GFP_KERNEL);
 409         if (!term)
 410                 return;
 411
 412         term->ddp_qn = cpu_to_be32(RDMAP_UNTAGGED_QN_TERMINATE);
 413         term->ddp_mo = 0;
 414         term->ddp_msn = cpu_to_be32(1);
 415
 416         iov[0].iov_base = term;
 417         iov[0].iov_len = sizeof(*term);
 418
 419         if ((qp->term_info.layer == TERM_ERROR_LAYER_DDP) ||
 420             ((qp->term_info.layer == TERM_ERROR_LAYER_RDMAP) &&
 421              (qp->term_info.etype != RDMAP_ETYPE_CATASTROPHIC))) {
 422                 err_hdr = kzalloc(sizeof(*err_hdr), GFP_KERNEL);
 423                 if (!err_hdr) {
 424                         kfree(term);
 425                         return;
 426                 }
 427         }
 428         memcpy(&term->ctrl, &iwarp_pktinfo[RDMAP_TERMINATE].ctrl,
 429                sizeof(struct iwarp_ctrl));
 430
 431         __rdmap_term_set_layer(term, qp->term_info.layer);
 432         __rdmap_term_set_etype(term, qp->term_info.etype);
 433         __rdmap_term_set_ecode(term, qp->term_info.ecode);
 434
 435         switch (qp->term_info.layer) {
 436         case TERM_ERROR_LAYER_RDMAP:
 437                 if (qp->term_info.etype == RDMAP_ETYPE_CATASTROPHIC)
 438                         /* No additional DDP/RDMAP header to be included */
 439                         break;
 440
 441                 if (qp->term_info.etype == RDMAP_ETYPE_REMOTE_PROTECTION) {
 442                         /*
 443                          * Complete RDMAP frame will get attached, and
 444                          * DDP segment length is valid
 445                          */
 446                         term->flag_m = 1;
 447                         term->flag_d = 1;
 448                         term->flag_r = 1;
 449
 450                         if (qp->term_info.in_tx) {
 451                                 struct iwarp_rdma_rreq *rreq;
 452                                 struct siw_wqe *wqe = tx_wqe(qp);
 453
 454                                 /* Inbound RREQ error, detected during
 455                                  * RRESP creation. Take state from
 456                                  * current TX work queue element to
 457                                  * reconstruct peers RREQ.
 458                                  */
 459                                 rreq = (struct iwarp_rdma_rreq *)err_hdr;
 460
 461                                 memcpy(&rreq->ctrl,
 462                                        &iwarp_pktinfo[RDMAP_RDMA_READ_REQ].ctrl,
 463                                        sizeof(struct iwarp_ctrl));
 464
 465                                 rreq->rsvd = 0;
 466                                 rreq->ddp_qn =
 467                                         htonl(RDMAP_UNTAGGED_QN_RDMA_READ);
 468
 469                                 /* Provide RREQ's MSN as kept aside */
 470                                 rreq->ddp_msn = htonl(wqe->sqe.sge[0].length);
 471
 472                                 rreq->ddp_mo = htonl(wqe->processed);
 473                                 rreq->sink_stag = htonl(wqe->sqe.rkey);
 474                                 rreq->sink_to = cpu_to_be64(wqe->sqe.raddr);
 475                                 rreq->read_size = htonl(wqe->sqe.sge[0].length);
 476                                 rreq->source_stag = htonl(wqe->sqe.sge[0].lkey);
 477                                 rreq->source_to =
 478                                         cpu_to_be64(wqe->sqe.sge[0].laddr);
 479
 480                                 iov[1].iov_base = rreq;
 481                                 iov[1].iov_len = sizeof(*rreq);
 482
 483                                 rx_hdr = (union iwarp_hdr *)rreq;
 484                         } else {
 485                                 /* Take RDMAP/DDP information from
 486                                  * current (failed) inbound frame.
 487                                  */
 488                                 iov[1].iov_base = rx_hdr;
 489
 490                                 if (__rdmap_get_opcode(&rx_hdr->ctrl) ==
 491                                     RDMAP_RDMA_READ_REQ)
 492                                         iov[1].iov_len =
 493                                                 sizeof(struct iwarp_rdma_rreq);
 494                                 else /* SEND type */
 495                                         iov[1].iov_len =
 496                                                 sizeof(struct iwarp_send);
 497                         }
 498                 } else {
 499                         /* Do not report DDP hdr information if packet
 500                          * layout is unknown
 501                          */
 502                         if ((qp->term_info.ecode == RDMAP_ECODE_VERSION) ||
 503                             (qp->term_info.ecode == RDMAP_ECODE_OPCODE))
 504                                 break;
 505
 506                         iov[1].iov_base = rx_hdr;
 507
 508                         /* Only DDP frame will get attached */
 509                         if (rx_hdr->ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)
 510                                 iov[1].iov_len =
 511                                         sizeof(struct iwarp_rdma_write);
 512                         else
 513                                 iov[1].iov_len = sizeof(struct iwarp_send);
 514
 515                         term->flag_m = 1;
 516                         term->flag_d = 1;
 517                 }
 518                 term->ctrl.mpa_len = cpu_to_be16(iov[1].iov_len);
 519                 break;
 520
 521         case TERM_ERROR_LAYER_DDP:
 522                 /* Report error encountered while DDP processing.
 523                  * This can only happen as a result of inbound
 524                  * DDP processing
 525                  */
 526
 527                 /* Do not report DDP hdr information if packet
 528                  * layout is unknown
 529                  */
 530                 if (((qp->term_info.etype == DDP_ETYPE_TAGGED_BUF) &&
 531                      (qp->term_info.ecode == DDP_ECODE_T_VERSION)) ||
 532                     ((qp->term_info.etype == DDP_ETYPE_UNTAGGED_BUF) &&
 533                      (qp->term_info.ecode == DDP_ECODE_UT_VERSION)))
 534                         break;
 535
 536                 iov[1].iov_base = rx_hdr;
 537
 538                 if (rx_hdr->ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)
 539                         iov[1].iov_len = sizeof(struct iwarp_ctrl_tagged);
 540                 else
 541                         iov[1].iov_len = sizeof(struct iwarp_ctrl_untagged);
 542
 543                 term->flag_m = 1;
 544                 term->flag_d = 1;
 545                 break;
 546
 547         default:
 548                 break;
 549         }
 550         if (term->flag_m || term->flag_d || term->flag_r) {
 551                 iov[2].iov_base = &crc;
 552                 iov[2].iov_len = sizeof(crc);
 553                 len_terminate = sizeof(*term) + iov[1].iov_len + MPA_CRC_SIZE;
 554                 num_frags = 3;
 555         } else {
 556                 iov[1].iov_base = &crc;
 557                 iov[1].iov_len = sizeof(crc);
 558                 len_terminate = sizeof(*term) + MPA_CRC_SIZE;
 559                 num_frags = 2;
 560         }
 561
 562         /* Adjust DDP Segment Length parameter, if valid */
 563         if (term->flag_m) {
 564                 u32 real_ddp_len = be16_to_cpu(rx_hdr->ctrl.mpa_len);
 565                 enum rdma_opcode op = __rdmap_get_opcode(&rx_hdr->ctrl);
 566
 567                 real_ddp_len -= iwarp_pktinfo[op].hdr_len - MPA_HDR_SIZE;
 568                 rx_hdr->ctrl.mpa_len = cpu_to_be16(real_ddp_len);
 569         }
 570
 571         term->ctrl.mpa_len =
 572                 cpu_to_be16(len_terminate - (MPA_HDR_SIZE + MPA_CRC_SIZE));
 573         if (qp->tx_ctx.mpa_crc_hd) {
 574                 crypto_shash_init(qp->tx_ctx.mpa_crc_hd);
 575                 if (crypto_shash_update(qp->tx_ctx.mpa_crc_hd,
 576                                         (u8 *)iov[0].iov_base,
 577                                         iov[0].iov_len))
 578                         goto out;
 579
 580                 if (num_frags == 3) {
 581                         if (crypto_shash_update(qp->tx_ctx.mpa_crc_hd,
 582                                                 (u8 *)iov[1].iov_base,
 583                                                 iov[1].iov_len))
 584                                 goto out;
 585                 }
 586                 crypto_shash_final(qp->tx_ctx.mpa_crc_hd, (u8 *)&crc);
 587         }
 588
 589         rv = kernel_sendmsg(s, &msg, iov, num_frags, len_terminate);
 590         siw_dbg_qp(qp, "sent TERM: %s, layer %d, type %d, code %d (%d bytes)\n",
 591                    rv == len_terminate ? "success" : "failure",
 592                    __rdmap_term_layer(term), __rdmap_term_etype(term),
 593                    __rdmap_term_ecode(term), rv);
 594 out:
 595         kfree(term);
 596         kfree(err_hdr);
 597 }
 598
 599 /*
 600  * Handle all attrs other than state
 601  */
 602 static void siw_qp_modify_nonstate(struct siw_qp *qp,
 603                                    struct siw_qp_attrs *attrs,
 604                                    enum siw_qp_attr_mask mask)
 605 {
 606         if (mask & SIW_QP_ATTR_ACCESS_FLAGS) {
 607                 if (attrs->flags & SIW_RDMA_BIND_ENABLED)
 608                         qp->attrs.flags |= SIW_RDMA_BIND_ENABLED;
 609                 else
 610                         qp->attrs.flags &= ~SIW_RDMA_BIND_ENABLED;
 611
 612                 if (attrs->flags & SIW_RDMA_WRITE_ENABLED)
 613                         qp->attrs.flags |= SIW_RDMA_WRITE_ENABLED;
 614                 else
 615                         qp->attrs.flags &= ~SIW_RDMA_WRITE_ENABLED;
 616
 617                 if (attrs->flags & SIW_RDMA_READ_ENABLED)
 618                         qp->attrs.flags |= SIW_RDMA_READ_ENABLED;
 619                 else
 620                         qp->attrs.flags &= ~SIW_RDMA_READ_ENABLED;
 621         }
 622 }
 623
 624 static int siw_qp_nextstate_from_idle(struct siw_qp *qp,
 625                                       struct siw_qp_attrs *attrs,
 626                                       enum siw_qp_attr_mask mask)
 627 {
 628         int rv = 0;
 629
 630         switch (attrs->state) {
 631         case SIW_QP_STATE_RTS:
 632                 if (attrs->flags & SIW_MPA_CRC) {
 633                         rv = siw_qp_enable_crc(qp);
 634                         if (rv)
 635                                 break;
 636                 }
 637                 if (!(mask & SIW_QP_ATTR_LLP_HANDLE)) {
 638                         siw_dbg_qp(qp, "no socket\n");
 639                         rv = -EINVAL;
 640                         break;
 641                 }
 642                 if (!(mask & SIW_QP_ATTR_MPA)) {
 643                         siw_dbg_qp(qp, "no MPA\n");
 644                         rv = -EINVAL;
 645                         break;
 646                 }
 647                 /*
 648                  * Initialize iWARP TX state
 649                  */
 650                 qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 0;
 651                 qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 0;
 652                 qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] = 0;
 653
 654                 /*
 655                  * Initialize iWARP RX state
 656                  */
 657                 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 1;
 658                 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 1;
 659                 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] = 1;
 660
 661                 /*
 662                  * init IRD free queue, caller has already checked
 663                  * limits.
 664                  */
 665                 rv = siw_qp_readq_init(qp, attrs->irq_size,
 666                                        attrs->orq_size);
 667                 if (rv)
 668                         break;
 669
 670                 qp->attrs.sk = attrs->sk;
 671                 qp->attrs.state = SIW_QP_STATE_RTS;
 672
 673                 siw_dbg_qp(qp, "enter RTS: crc=%s, ord=%u, ird=%u\n",
 674                            attrs->flags & SIW_MPA_CRC ? "y" : "n",
 675                            qp->attrs.orq_size, qp->attrs.irq_size);
 676                 break;
 677
 678         case SIW_QP_STATE_ERROR:
 679                 siw_rq_flush(qp);
 680                 qp->attrs.state = SIW_QP_STATE_ERROR;
 681                 if (qp->cep) {
 682                         siw_cep_put(qp->cep);
 683                         qp->cep = NULL;
 684                 }
 685                 break;
 686
 687         default:
 688                 break;
 689         }
 690         return rv;
 691 }
 692
 693 static int siw_qp_nextstate_from_rts(struct siw_qp *qp,
 694                                      struct siw_qp_attrs *attrs)
 695 {
 696         int drop_conn = 0;
 697
 698         switch (attrs->state) {
 699         case SIW_QP_STATE_CLOSING:
 700                 /*
 701                  * Verbs: move to IDLE if SQ and ORQ are empty.
 702                  * Move to ERROR otherwise. But first of all we must
 703                  * close the connection. So we keep CLOSING or ERROR
 704                  * as a transient state, schedule connection drop work
 705                  * and wait for the socket state change upcall to
 706                  * come back closed.
 707                  */
 708                 if (tx_wqe(qp)->wr_status == SIW_WR_IDLE) {
 709                         qp->attrs.state = SIW_QP_STATE_CLOSING;
 710                 } else {
 711                         qp->attrs.state = SIW_QP_STATE_ERROR;
 712                         siw_sq_flush(qp);
 713                 }
 714                 siw_rq_flush(qp);
 715
 716                 drop_conn = 1;
 717                 break;
 718
 719         case SIW_QP_STATE_TERMINATE:
 720                 qp->attrs.state = SIW_QP_STATE_TERMINATE;
 721
 722                 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
 723                                    RDMAP_ETYPE_CATASTROPHIC,
 724                                    RDMAP_ECODE_UNSPECIFIED, 1);
 725                 drop_conn = 1;
 726                 break;
 727
 728         case SIW_QP_STATE_ERROR:
 729                 /*
 730                  * This is an emergency close.
 731                  *
 732                  * Any in progress transmit operation will get
 733                  * cancelled.
 734                  * This will likely result in a protocol failure,
 735                  * if a TX operation is in transit. The caller
 736                  * could unconditional wait to give the current
 737                  * operation a chance to complete.
 738                  * Esp., how to handle the non-empty IRQ case?
 739                  * The peer was asking for data transfer at a valid
 740                  * point in time.
 741                  */
 742                 siw_sq_flush(qp);
 743                 siw_rq_flush(qp);
 744                 qp->attrs.state = SIW_QP_STATE_ERROR;
 745                 drop_conn = 1;
 746                 break;
 747
 748         default:
 749                 break;
 750         }
 751         return drop_conn;
 752 }
 753
 754 static void siw_qp_nextstate_from_term(struct siw_qp *qp,
 755                                        struct siw_qp_attrs *attrs)
 756 {
 757         switch (attrs->state) {
 758         case SIW_QP_STATE_ERROR:
 759                 siw_rq_flush(qp);
 760                 qp->attrs.state = SIW_QP_STATE_ERROR;
 761
 762                 if (tx_wqe(qp)->wr_status != SIW_WR_IDLE)
 763                         siw_sq_flush(qp);
 764                 break;
 765
 766         default:
 767                 break;
 768         }
 769 }
 770
 771 static int siw_qp_nextstate_from_close(struct siw_qp *qp,
 772                                        struct siw_qp_attrs *attrs)
 773 {
 774         int rv = 0;
 775
 776         switch (attrs->state) {
 777         case SIW_QP_STATE_IDLE:
 778                 WARN_ON(tx_wqe(qp)->wr_status != SIW_WR_IDLE);
 779                 qp->attrs.state = SIW_QP_STATE_IDLE;
 780                 break;
 781
 782         case SIW_QP_STATE_CLOSING:
 783                 /*
 784                  * The LLP may already moved the QP to closing
 785                  * due to graceful peer close init
 786                  */
 787                 break;
 788
 789         case SIW_QP_STATE_ERROR:
 790                 /*
 791                  * QP was moved to CLOSING by LLP event
 792                  * not yet seen by user.
 793                  */
 794                 qp->attrs.state = SIW_QP_STATE_ERROR;
 795
 796                 if (tx_wqe(qp)->wr_status != SIW_WR_IDLE)
 797                         siw_sq_flush(qp);
 798
 799                 siw_rq_flush(qp);
 800                 break;
 801
 802         default:
 803                 siw_dbg_qp(qp, "state transition undefined: %s => %s\n",
 804                            siw_qp_state_to_string[qp->attrs.state],
 805                            siw_qp_state_to_string[attrs->state]);
 806
 807                 rv = -ECONNABORTED;
 808         }
 809         return rv;
 810 }
 811
 812 /*
 813  * Caller must hold qp->state_lock
 814  */
 815 int siw_qp_modify(struct siw_qp *qp, struct siw_qp_attrs *attrs,
 816                   enum siw_qp_attr_mask mask)
 817 {
 818         int drop_conn = 0, rv = 0;
 819
 820         if (!mask)
 821                 return 0;
 822
 823         siw_dbg_qp(qp, "state: %s => %s\n",
 824                    siw_qp_state_to_string[qp->attrs.state],
 825                    siw_qp_state_to_string[attrs->state]);
 826
 827         if (mask != SIW_QP_ATTR_STATE)
 828                 siw_qp_modify_nonstate(qp, attrs, mask);
 829
 830         if (!(mask & SIW_QP_ATTR_STATE))
 831                 return 0;
 832
 833         switch (qp->attrs.state) {
 834         case SIW_QP_STATE_IDLE:
 835         case SIW_QP_STATE_RTR:
 836                 rv = siw_qp_nextstate_from_idle(qp, attrs, mask);
 837                 break;
 838
 839         case SIW_QP_STATE_RTS:
 840                 drop_conn = siw_qp_nextstate_from_rts(qp, attrs);
 841                 break;
 842
 843         case SIW_QP_STATE_TERMINATE:
 844                 siw_qp_nextstate_from_term(qp, attrs);
 845                 break;
 846
 847         case SIW_QP_STATE_CLOSING:
 848                 siw_qp_nextstate_from_close(qp, attrs);
 849                 break;
 850         default:
 851                 break;
 852         }
 853         if (drop_conn)
 854                 siw_qp_cm_drop(qp, 0);
 855
 856         return rv;
 857 }
 858
 859 void siw_read_to_orq(struct siw_sqe *rreq, struct siw_sqe *sqe)
 860 {
 861         rreq->id = sqe->id;
 862         rreq->opcode = sqe->opcode;
 863         rreq->sge[0].laddr = sqe->sge[0].laddr;
 864         rreq->sge[0].length = sqe->sge[0].length;
 865         rreq->sge[0].lkey = sqe->sge[0].lkey;
 866         rreq->sge[1].lkey = sqe->sge[1].lkey;
 867         rreq->flags = sqe->flags | SIW_WQE_VALID;
 868         rreq->num_sge = 1;
 869 }
 870
 871 /*
 872  * Must be called with SQ locked.
 873  * To avoid complete SQ starvation by constant inbound READ requests,
 874  * the active IRQ will not be served after qp->irq_burst, if the
 875  * SQ has pending work.
 876  */
 877 int siw_activate_tx(struct siw_qp *qp)
 878 {
 879         struct siw_sqe *irqe, *sqe;
 880         struct siw_wqe *wqe = tx_wqe(qp);
 881         int rv = 1;
 882
 883         irqe = &qp->irq[qp->irq_get % qp->attrs.irq_size];
 884
 885         if (irqe->flags & SIW_WQE_VALID) {
 886                 sqe = sq_get_next(qp);
 887
 888                 /*
 889                  * Avoid local WQE processing starvation in case
 890                  * of constant inbound READ request stream
 891                  */
 892                 if (sqe && ++qp->irq_burst >= SIW_IRQ_MAXBURST_SQ_ACTIVE) {
 893                         qp->irq_burst = 0;
 894                         goto skip_irq;
 895                 }
 896                 memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
 897                 wqe->wr_status = SIW_WR_QUEUED;
 898
 899                 /* start READ RESPONSE */
 900                 wqe->sqe.opcode = SIW_OP_READ_RESPONSE;
 901                 wqe->sqe.flags = 0;
 902                 if (irqe->num_sge) {
 903                         wqe->sqe.num_sge = 1;
 904                         wqe->sqe.sge[0].length = irqe->sge[0].length;
 905                         wqe->sqe.sge[0].laddr = irqe->sge[0].laddr;
 906                         wqe->sqe.sge[0].lkey = irqe->sge[0].lkey;
 907                 } else {
 908                         wqe->sqe.num_sge = 0;
 909                 }
 910
 911                 /* Retain original RREQ's message sequence number for
 912                  * potential error reporting cases.
 913                  */
 914                 wqe->sqe.sge[1].length = irqe->sge[1].length;
 915
 916                 wqe->sqe.rkey = irqe->rkey;
 917                 wqe->sqe.raddr = irqe->raddr;
 918
 919                 wqe->processed = 0;
 920                 qp->irq_get++;
 921
 922                 /* mark current IRQ entry free */
 923                 smp_store_mb(irqe->flags, 0);
 924
 925                 goto out;
 926         }
 927         sqe = sq_get_next(qp);
 928         if (sqe) {
 929 skip_irq:
 930                 memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
 931                 wqe->wr_status = SIW_WR_QUEUED;
 932
 933                 /* First copy SQE to kernel private memory */
 934                 memcpy(&wqe->sqe, sqe, sizeof(*sqe));
 935
 936                 if (wqe->sqe.opcode >= SIW_NUM_OPCODES) {
 937                         rv = -EINVAL;
 938                         goto out;
 939                 }
 940                 if (wqe->sqe.flags & SIW_WQE_INLINE) {
 941                         if (wqe->sqe.opcode != SIW_OP_SEND &&
 942                             wqe->sqe.opcode != SIW_OP_WRITE) {
 943                                 rv = -EINVAL;
 944                                 goto out;
 945                         }
 946                         if (wqe->sqe.sge[0].length > SIW_MAX_INLINE) {
 947                                 rv = -EINVAL;
 948                                 goto out;
 949                         }
 950                         wqe->sqe.sge[0].laddr = (u64)&wqe->sqe.sge[1];
 951                         wqe->sqe.sge[0].lkey = 0;
 952                         wqe->sqe.num_sge = 1;
 953                 }
 954                 if (wqe->sqe.flags & SIW_WQE_READ_FENCE) {
 955                         /* A READ cannot be fenced */
 956                         if (unlikely(wqe->sqe.opcode == SIW_OP_READ ||
 957                                      wqe->sqe.opcode ==
 958                                              SIW_OP_READ_LOCAL_INV)) {
 959                                 siw_dbg_qp(qp, "cannot fence read\n");
 960                                 rv = -EINVAL;
 961                                 goto out;
 962                         }
 963                         spin_lock(&qp->orq_lock);
 964
 965                         if (!siw_orq_empty(qp)) {
 966                                 qp->tx_ctx.orq_fence = 1;
 967                                 rv = 0;
 968                         }
 969                         spin_unlock(&qp->orq_lock);
 970
 971                 } else if (wqe->sqe.opcode == SIW_OP_READ ||
 972                            wqe->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
 973                         struct siw_sqe *rreq;
 974
 975                         wqe->sqe.num_sge = 1;
 976
 977                         spin_lock(&qp->orq_lock);
 978
 979                         rreq = orq_get_free(qp);
 980                         if (rreq) {
 981                                 /*
 982                                  * Make an immediate copy in ORQ to be ready
 983                                  * to process loopback READ reply
 984                                  */
 985                                 siw_read_to_orq(rreq, &wqe->sqe);
 986                                 qp->orq_put++;
 987                         } else {
 988                                 qp->tx_ctx.orq_fence = 1;
 989                                 rv = 0;
 990                         }
 991                         spin_unlock(&qp->orq_lock);
 992                 }
 993
 994                 /* Clear SQE, can be re-used by application */
 995                 smp_store_mb(sqe->flags, 0);
 996                 qp->sq_get++;
 997         } else {
 998                 rv = 0;
 999         }
1000 out:
1001         if (unlikely(rv < 0)) {
1002                 siw_dbg_qp(qp, "error %d\n", rv);
1003                 wqe->wr_status = SIW_WR_IDLE;
1004         }
1005         return rv;
1006 }
1007
1008 /*
1009  * Check if current CQ state qualifies for calling CQ completion
1010  * handler. Must be called with CQ lock held.
1011  */
1012 static bool siw_cq_notify_now(struct siw_cq *cq, u32 flags)
1013 {
1014         u64 cq_notify;
1015
1016         if (!cq->base_cq.comp_handler)
1017                 return false;
1018
1019         cq_notify = READ_ONCE(*cq->notify);
1020
1021         if ((cq_notify & SIW_NOTIFY_NEXT_COMPLETION) ||
1022             ((cq_notify & SIW_NOTIFY_SOLICITED) &&
1023              (flags & SIW_WQE_SOLICITED))) {
1024                 /* dis-arm CQ */
1025                 smp_store_mb(*cq->notify, SIW_NOTIFY_NOT);
1026
1027                 return true;
1028         }
1029         return false;
1030 }
1031
1032 int siw_sqe_complete(struct siw_qp *qp, struct siw_sqe *sqe, u32 bytes,
1033                      enum siw_wc_status status)
1034 {
1035         struct siw_cq *cq = qp->scq;
1036         int rv = 0;
1037
1038         if (cq) {
1039                 u32 sqe_flags = sqe->flags;
1040                 struct siw_cqe *cqe;
1041                 u32 idx;
1042                 unsigned long flags;
1043
1044                 spin_lock_irqsave(&cq->lock, flags);
1045
1046                 idx = cq->cq_put % cq->num_cqe;
1047                 cqe = &cq->queue[idx];
1048
1049                 if (!READ_ONCE(cqe->flags)) {
1050                         bool notify;
1051
1052                         cqe->id = sqe->id;
1053                         cqe->opcode = sqe->opcode;
1054                         cqe->status = status;
1055                         cqe->imm_data = 0;
1056                         cqe->bytes = bytes;
1057
1058                         if (cq->kernel_verbs)
1059                                 cqe->base_qp = qp->ib_qp;
1060                         else
1061                                 cqe->qp_id = qp_id(qp);
1062
1063                         /* mark CQE valid for application */
1064                         WRITE_ONCE(cqe->flags, SIW_WQE_VALID);
1065                         /* recycle SQE */
1066                         smp_store_mb(sqe->flags, 0);
1067
1068                         cq->cq_put++;
1069                         notify = siw_cq_notify_now(cq, sqe_flags);
1070
1071                         spin_unlock_irqrestore(&cq->lock, flags);
1072
1073                         if (notify) {
1074                                 siw_dbg_cq(cq, "Call completion handler\n");
1075                                 cq->base_cq.comp_handler(&cq->base_cq,
1076                                                 cq->base_cq.cq_context);
1077                         }
1078                 } else {
1079                         spin_unlock_irqrestore(&cq->lock, flags);
1080                         rv = -ENOMEM;
1081                         siw_cq_event(cq, IB_EVENT_CQ_ERR);
1082                 }
1083         } else {
1084                 /* recycle SQE */
1085                 smp_store_mb(sqe->flags, 0);
1086         }
1087         return rv;
1088 }
1089
1090 int siw_rqe_complete(struct siw_qp *qp, struct siw_rqe *rqe, u32 bytes,
1091                      u32 inval_stag, enum siw_wc_status status)
1092 {
1093         struct siw_cq *cq = qp->rcq;
1094         int rv = 0;
1095
1096         if (cq) {
1097                 struct siw_cqe *cqe;
1098                 u32 idx;
1099                 unsigned long flags;
1100
1101                 spin_lock_irqsave(&cq->lock, flags);
1102
1103                 idx = cq->cq_put % cq->num_cqe;
1104                 cqe = &cq->queue[idx];
1105
1106                 if (!READ_ONCE(cqe->flags)) {
1107                         bool notify;
1108                         u8 cqe_flags = SIW_WQE_VALID;
1109
1110                         cqe->id = rqe->id;
1111                         cqe->opcode = SIW_OP_RECEIVE;
1112                         cqe->status = status;
1113                         cqe->imm_data = 0;
1114                         cqe->bytes = bytes;
1115
1116                         if (cq->kernel_verbs) {
1117                                 cqe->base_qp = qp->ib_qp;
1118                                 if (inval_stag) {
1119                                         cqe_flags |= SIW_WQE_REM_INVAL;
1120                                         cqe->inval_stag = inval_stag;
1121                                 }
1122                         } else {
1123                                 cqe->qp_id = qp_id(qp);
1124                         }
1125                         /* mark CQE valid for application */
1126                         WRITE_ONCE(cqe->flags, cqe_flags);
1127                         /* recycle RQE */
1128                         smp_store_mb(rqe->flags, 0);
1129
1130                         cq->cq_put++;
1131                         notify = siw_cq_notify_now(cq, SIW_WQE_SIGNALLED);
1132
1133                         spin_unlock_irqrestore(&cq->lock, flags);
1134
1135                         if (notify) {
1136                                 siw_dbg_cq(cq, "Call completion handler\n");
1137                                 cq->base_cq.comp_handler(&cq->base_cq,
1138                                                 cq->base_cq.cq_context);
1139                         }
1140                 } else {
1141                         spin_unlock_irqrestore(&cq->lock, flags);
1142                         rv = -ENOMEM;
1143                         siw_cq_event(cq, IB_EVENT_CQ_ERR);
1144                 }
1145         } else {
1146                 /* recycle RQE */
1147                 smp_store_mb(rqe->flags, 0);
1148         }
1149         return rv;
1150 }
1151
1152 /*
1153  * siw_sq_flush()
1154  *
1155  * Flush SQ and ORRQ entries to CQ.
1156  *
1157  * Must be called with QP state write lock held.
1158  * Therefore, SQ and ORQ lock must not be taken.
1159  */
1160 void siw_sq_flush(struct siw_qp *qp)
1161 {
1162         struct siw_sqe *sqe;
1163         struct siw_wqe *wqe = tx_wqe(qp);
1164         int async_event = 0;
1165
1166         /*
1167          * Start with completing any work currently on the ORQ
1168          */
1169         while (qp->attrs.orq_size) {
1170                 sqe = &qp->orq[qp->orq_get % qp->attrs.orq_size];
1171                 if (!READ_ONCE(sqe->flags))
1172                         break;
1173
1174                 if (siw_sqe_complete(qp, sqe, 0, SIW_WC_WR_FLUSH_ERR) != 0)
1175                         break;
1176
1177                 WRITE_ONCE(sqe->flags, 0);
1178                 qp->orq_get++;
1179         }
1180         /*
1181          * Flush an in-progress WQE if present
1182          */
1183         if (wqe->wr_status != SIW_WR_IDLE) {
1184                 siw_dbg_qp(qp, "flush current SQE, type %d, status %d\n",
1185                            tx_type(wqe), wqe->wr_status);
1186
1187                 siw_wqe_put_mem(wqe, tx_type(wqe));
1188
1189                 if (tx_type(wqe) != SIW_OP_READ_RESPONSE &&
1190                     ((tx_type(wqe) != SIW_OP_READ &&
1191                       tx_type(wqe) != SIW_OP_READ_LOCAL_INV) ||
1192                      wqe->wr_status == SIW_WR_QUEUED))
1193                         /*
1194                          * An in-progress Read Request is already in
1195                          * the ORQ
1196                          */
1197                         siw_sqe_complete(qp, &wqe->sqe, wqe->bytes,
1198                                          SIW_WC_WR_FLUSH_ERR);
1199
1200                 wqe->wr_status = SIW_WR_IDLE;
1201         }
1202         /*
1203          * Flush the Send Queue
1204          */
1205         while (qp->attrs.sq_size) {
1206                 sqe = &qp->sendq[qp->sq_get % qp->attrs.sq_size];
1207                 if (!READ_ONCE(sqe->flags))
1208                         break;
1209
1210                 async_event = 1;
1211                 if (siw_sqe_complete(qp, sqe, 0, SIW_WC_WR_FLUSH_ERR) != 0)
1212                         /*
1213                          * Shall IB_EVENT_SQ_DRAINED be supressed if work
1214                          * completion fails?
1215                          */
1216                         break;
1217
1218                 WRITE_ONCE(sqe->flags, 0);
1219                 qp->sq_get++;
1220         }
1221         if (async_event)
1222                 siw_qp_event(qp, IB_EVENT_SQ_DRAINED);
1223 }
1224
1225 /*
1226  * siw_rq_flush()
1227  *
1228  * Flush recv queue entries to CQ. Also
1229  * takes care of pending active tagged and untagged
1230  * inbound transfers, which have target memory
1231  * referenced.
1232  *
1233  * Must be called with QP state write lock held.
1234  * Therefore, RQ lock must not be taken.
1235  */
1236 void siw_rq_flush(struct siw_qp *qp)
1237 {
1238         struct siw_wqe *wqe = &qp->rx_untagged.wqe_active;
1239
1240         /*
1241          * Flush an in-progress untagged operation if present
1242          */
1243         if (wqe->wr_status != SIW_WR_IDLE) {
1244                 siw_dbg_qp(qp, "flush current rqe, type %d, status %d\n",
1245                            rx_type(wqe), wqe->wr_status);
1246
1247                 siw_wqe_put_mem(wqe, rx_type(wqe));
1248
1249                 if (rx_type(wqe) == SIW_OP_RECEIVE) {
1250                         siw_rqe_complete(qp, &wqe->rqe, wqe->bytes,
1251                                          0, SIW_WC_WR_FLUSH_ERR);
1252                 } else if (rx_type(wqe) != SIW_OP_READ &&
1253                            rx_type(wqe) != SIW_OP_READ_RESPONSE &&
1254                            rx_type(wqe) != SIW_OP_WRITE) {
1255                         siw_sqe_complete(qp, &wqe->sqe, 0, SIW_WC_WR_FLUSH_ERR);
1256                 }
1257                 wqe->wr_status = SIW_WR_IDLE;
1258         }
1259         wqe = &qp->rx_tagged.wqe_active;
1260
1261         if (wqe->wr_status != SIW_WR_IDLE) {
1262                 siw_wqe_put_mem(wqe, rx_type(wqe));
1263                 wqe->wr_status = SIW_WR_IDLE;
1264         }
1265         /*
1266          * Flush the Receive Queue
1267          */
1268         while (qp->attrs.rq_size) {
1269                 struct siw_rqe *rqe =
1270                         &qp->recvq[qp->rq_get % qp->attrs.rq_size];
1271
1272                 if (!READ_ONCE(rqe->flags))
1273                         break;
1274
1275                 if (siw_rqe_complete(qp, rqe, 0, 0, SIW_WC_WR_FLUSH_ERR) != 0)
1276                         break;
1277
1278                 WRITE_ONCE(rqe->flags, 0);
1279                 qp->rq_get++;
1280         }
1281 }
1282
1283 int siw_qp_add(struct siw_device *sdev, struct siw_qp *qp)
1284 {
1285         int rv = xa_alloc(&sdev->qp_xa, &qp->ib_qp->qp_num, qp, xa_limit_32b,
1286                           GFP_KERNEL);
1287
1288         if (!rv) {
1289                 kref_init(&qp->ref);
1290                 qp->sdev = sdev;
1291                 qp->qp_num = qp->ib_qp->qp_num;
1292                 siw_dbg_qp(qp, "new QP\n");
1293         }
1294         return rv;
1295 }
1296
1297 void siw_free_qp(struct kref *ref)
1298 {
1299         struct siw_qp *found, *qp = container_of(ref, struct siw_qp, ref);
1300         struct siw_device *sdev = qp->sdev;
1301         unsigned long flags;
1302
1303         if (qp->cep)
1304                 siw_cep_put(qp->cep);
1305
1306         found = xa_erase(&sdev->qp_xa, qp_id(qp));
1307         WARN_ON(found != qp);
1308         spin_lock_irqsave(&sdev->lock, flags);
1309         list_del(&qp->devq);
1310         spin_unlock_irqrestore(&sdev->lock, flags);
1311
1312         vfree(qp->sendq);
1313         vfree(qp->recvq);
1314         vfree(qp->irq);
1315         vfree(qp->orq);
1316
1317         siw_put_tx_cpu(qp->tx_cpu);
1318
1319         atomic_dec(&sdev->num_qp);
1320         siw_dbg_qp(qp, "free QP\n");
1321         kfree_rcu(qp, rcu);
1322 }