drivers/infiniband/hw/hfi1/qp.c

   1 /*
   2  * Copyright(c) 2015 - 2017 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include <linux/err.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/hash.h>
  51 #include <linux/module.h>
  52 #include <linux/seq_file.h>
  53 #include <rdma/rdma_vt.h>
  54 #include <rdma/rdmavt_qp.h>
  55 #include <rdma/ib_verbs.h>
  56
  57 #include "hfi.h"
  58 #include "qp.h"
  59 #include "trace.h"
  60 #include "verbs_txreq.h"
  61
  62 unsigned int hfi1_qp_table_size = 256;
  63 module_param_named(qp_table_size, hfi1_qp_table_size, uint, S_IRUGO);
  64 MODULE_PARM_DESC(qp_table_size, "QP table size");
  65
  66 static void flush_tx_list(struct rvt_qp *qp);
  67 static int iowait_sleep(
  68         struct sdma_engine *sde,
  69         struct iowait *wait,
  70         struct sdma_txreq *stx,
  71         unsigned int seq,
  72         bool pkts_sent);
  73 static void iowait_wakeup(struct iowait *wait, int reason);
  74 static void iowait_sdma_drained(struct iowait *wait);
  75 static void qp_pio_drain(struct rvt_qp *qp);
  76
  77 const struct rvt_operation_params hfi1_post_parms[RVT_OPERATION_MAX] = {
  78 [IB_WR_RDMA_WRITE] = {
  79         .length = sizeof(struct ib_rdma_wr),
  80         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  81 },
  82
  83 [IB_WR_RDMA_READ] = {
  84         .length = sizeof(struct ib_rdma_wr),
  85         .qpt_support = BIT(IB_QPT_RC),
  86         .flags = RVT_OPERATION_ATOMIC,
  87 },
  88
  89 [IB_WR_ATOMIC_CMP_AND_SWP] = {
  90         .length = sizeof(struct ib_atomic_wr),
  91         .qpt_support = BIT(IB_QPT_RC),
  92         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
  93 },
  94
  95 [IB_WR_ATOMIC_FETCH_AND_ADD] = {
  96         .length = sizeof(struct ib_atomic_wr),
  97         .qpt_support = BIT(IB_QPT_RC),
  98         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
  99 },
 100
 101 [IB_WR_RDMA_WRITE_WITH_IMM] = {
 102         .length = sizeof(struct ib_rdma_wr),
 103         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 104 },
 105
 106 [IB_WR_SEND] = {
 107         .length = sizeof(struct ib_send_wr),
 108         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
 109                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 110 },
 111
 112 [IB_WR_SEND_WITH_IMM] = {
 113         .length = sizeof(struct ib_send_wr),
 114         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
 115                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 116 },
 117
 118 [IB_WR_REG_MR] = {
 119         .length = sizeof(struct ib_reg_wr),
 120         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 121         .flags = RVT_OPERATION_LOCAL,
 122 },
 123
 124 [IB_WR_LOCAL_INV] = {
 125         .length = sizeof(struct ib_send_wr),
 126         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 127         .flags = RVT_OPERATION_LOCAL,
 128 },
 129
 130 [IB_WR_SEND_WITH_INV] = {
 131         .length = sizeof(struct ib_send_wr),
 132         .qpt_support = BIT(IB_QPT_RC),
 133 },
 134
 135 };
 136
 137 static void flush_tx_list(struct rvt_qp *qp)
 138 {
 139         struct hfi1_qp_priv *priv = qp->priv;
 140
 141         while (!list_empty(&priv->s_iowait.tx_head)) {
 142                 struct sdma_txreq *tx;
 143
 144                 tx = list_first_entry(
 145                         &priv->s_iowait.tx_head,
 146                         struct sdma_txreq,
 147                         list);
 148                 list_del_init(&tx->list);
 149                 hfi1_put_txreq(
 150                         container_of(tx, struct verbs_txreq, txreq));
 151         }
 152 }
 153
 154 static void flush_iowait(struct rvt_qp *qp)
 155 {
 156         struct hfi1_qp_priv *priv = qp->priv;
 157         unsigned long flags;
 158         seqlock_t *lock = priv->s_iowait.lock;
 159
 160         if (!lock)
 161                 return;
 162         write_seqlock_irqsave(lock, flags);
 163         if (!list_empty(&priv->s_iowait.list)) {
 164                 list_del_init(&priv->s_iowait.list);
 165                 priv->s_iowait.lock = NULL;
 166                 rvt_put_qp(qp);
 167         }
 168         write_sequnlock_irqrestore(lock, flags);
 169 }
 170
 171 static inline int opa_mtu_enum_to_int(int mtu)
 172 {
 173         switch (mtu) {
 174         case OPA_MTU_8192:  return 8192;
 175         case OPA_MTU_10240: return 10240;
 176         default:            return -1;
 177         }
 178 }
 179
 180 /**
 181  * This function is what we would push to the core layer if we wanted to be a
 182  * "first class citizen".  Instead we hide this here and rely on Verbs ULPs
 183  * to blindly pass the MTU enum value from the PathRecord to us.
 184  */
 185 static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
 186 {
 187         int val;
 188
 189         /* Constraining 10KB packets to 8KB packets */
 190         if (mtu == (enum ib_mtu)OPA_MTU_10240)
 191                 mtu = OPA_MTU_8192;
 192         val = opa_mtu_enum_to_int((int)mtu);
 193         if (val > 0)
 194                 return val;
 195         return ib_mtu_enum_to_int(mtu);
 196 }
 197
 198 int hfi1_check_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 199                          int attr_mask, struct ib_udata *udata)
 200 {
 201         struct ib_qp *ibqp = &qp->ibqp;
 202         struct hfi1_ibdev *dev = to_idev(ibqp->device);
 203         struct hfi1_devdata *dd = dd_from_dev(dev);
 204         u8 sc;
 205
 206         if (attr_mask & IB_QP_AV) {
 207                 sc = ah_to_sc(ibqp->device, &attr->ah_attr);
 208                 if (sc == 0xf)
 209                         return -EINVAL;
 210
 211                 if (!qp_to_sdma_engine(qp, sc) &&
 212                     dd->flags & HFI1_HAS_SEND_DMA)
 213                         return -EINVAL;
 214
 215                 if (!qp_to_send_context(qp, sc))
 216                         return -EINVAL;
 217         }
 218
 219         if (attr_mask & IB_QP_ALT_PATH) {
 220                 sc = ah_to_sc(ibqp->device, &attr->alt_ah_attr);
 221                 if (sc == 0xf)
 222                         return -EINVAL;
 223
 224                 if (!qp_to_sdma_engine(qp, sc) &&
 225                     dd->flags & HFI1_HAS_SEND_DMA)
 226                         return -EINVAL;
 227
 228                 if (!qp_to_send_context(qp, sc))
 229                         return -EINVAL;
 230         }
 231
 232         return 0;
 233 }
 234
 235 /*
 236  * qp_set_16b - Set the hdr_type based on whether the slid or the
 237  * dlid in the connection is extended. Only applicable for RC and UC
 238  * QPs. UD QPs determine this on the fly from the ah in the wqe
 239  */
 240 static inline void qp_set_16b(struct rvt_qp *qp)
 241 {
 242         struct hfi1_pportdata *ppd;
 243         struct hfi1_ibport *ibp;
 244         struct hfi1_qp_priv *priv = qp->priv;
 245
 246         /* Update ah_attr to account for extended LIDs */
 247         hfi1_update_ah_attr(qp->ibqp.device, &qp->remote_ah_attr);
 248
 249         /* Create 32 bit LIDs */
 250         hfi1_make_opa_lid(&qp->remote_ah_attr);
 251
 252         if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH))
 253                 return;
 254
 255         ibp = to_iport(qp->ibqp.device, qp->port_num);
 256         ppd = ppd_from_ibp(ibp);
 257         priv->hdr_type = hfi1_get_hdr_type(ppd->lid, &qp->remote_ah_attr);
 258 }
 259
 260 void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 261                     int attr_mask, struct ib_udata *udata)
 262 {
 263         struct ib_qp *ibqp = &qp->ibqp;
 264         struct hfi1_qp_priv *priv = qp->priv;
 265
 266         if (attr_mask & IB_QP_AV) {
 267                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 268                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 269                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 270                 qp_set_16b(qp);
 271         }
 272
 273         if (attr_mask & IB_QP_PATH_MIG_STATE &&
 274             attr->path_mig_state == IB_MIG_MIGRATED &&
 275             qp->s_mig_state == IB_MIG_ARMED) {
 276                 qp->s_flags |= RVT_S_AHG_CLEAR;
 277                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 278                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 279                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 280                 qp_set_16b(qp);
 281         }
 282 }
 283
 284 /**
 285  * hfi1_check_send_wqe - validate wqe
 286  * @qp - The qp
 287  * @wqe - The built wqe
 288  *
 289  * validate wqe.  This is called
 290  * prior to inserting the wqe into
 291  * the ring but after the wqe has been
 292  * setup.
 293  *
 294  * Returns 0 on success, -EINVAL on failure
 295  *
 296  */
 297 int hfi1_check_send_wqe(struct rvt_qp *qp,
 298                         struct rvt_swqe *wqe)
 299 {
 300         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 301         struct rvt_ah *ah;
 302
 303         switch (qp->ibqp.qp_type) {
 304         case IB_QPT_RC:
 305         case IB_QPT_UC:
 306                 if (wqe->length > 0x80000000U)
 307                         return -EINVAL;
 308                 break;
 309         case IB_QPT_SMI:
 310                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 311                 if (wqe->length > (1 << ah->log_pmtu))
 312                         return -EINVAL;
 313                 break;
 314         case IB_QPT_GSI:
 315         case IB_QPT_UD:
 316                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 317                 if (wqe->length > (1 << ah->log_pmtu))
 318                         return -EINVAL;
 319                 if (ibp->sl_to_sc[rdma_ah_get_sl(&ah->attr)] == 0xf)
 320                         return -EINVAL;
 321         default:
 322                 break;
 323         }
 324         return wqe->length <= piothreshold;
 325 }
 326
 327 /**
 328  * _hfi1_schedule_send - schedule progress
 329  * @qp: the QP
 330  *
 331  * This schedules qp progress w/o regard to the s_flags.
 332  *
 333  * It is only used in the post send, which doesn't hold
 334  * the s_lock.
 335  */
 336 void _hfi1_schedule_send(struct rvt_qp *qp)
 337 {
 338         struct hfi1_qp_priv *priv = qp->priv;
 339         struct hfi1_ibport *ibp =
 340                 to_iport(qp->ibqp.device, qp->port_num);
 341         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 342         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 343
 344         iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
 345                         priv->s_sde ?
 346                         priv->s_sde->cpu :
 347                         cpumask_first(cpumask_of_node(dd->node)));
 348 }
 349
 350 static void qp_pio_drain(struct rvt_qp *qp)
 351 {
 352         struct hfi1_ibdev *dev;
 353         struct hfi1_qp_priv *priv = qp->priv;
 354
 355         if (!priv->s_sendcontext)
 356                 return;
 357         dev = to_idev(qp->ibqp.device);
 358         while (iowait_pio_pending(&priv->s_iowait)) {
 359                 write_seqlock_irq(&dev->iowait_lock);
 360                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 1);
 361                 write_sequnlock_irq(&dev->iowait_lock);
 362                 iowait_pio_drain(&priv->s_iowait);
 363                 write_seqlock_irq(&dev->iowait_lock);
 364                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 0);
 365                 write_sequnlock_irq(&dev->iowait_lock);
 366         }
 367 }
 368
 369 /**
 370  * hfi1_schedule_send - schedule progress
 371  * @qp: the QP
 372  *
 373  * This schedules qp progress and caller should hold
 374  * the s_lock.
 375  */
 376 void hfi1_schedule_send(struct rvt_qp *qp)
 377 {
 378         lockdep_assert_held(&qp->s_lock);
 379         if (hfi1_send_ok(qp))
 380                 _hfi1_schedule_send(qp);
 381 }
 382
 383 void hfi1_qp_wakeup(struct rvt_qp *qp, u32 flag)
 384 {
 385         unsigned long flags;
 386
 387         spin_lock_irqsave(&qp->s_lock, flags);
 388         if (qp->s_flags & flag) {
 389                 qp->s_flags &= ~flag;
 390                 trace_hfi1_qpwakeup(qp, flag);
 391                 hfi1_schedule_send(qp);
 392         }
 393         spin_unlock_irqrestore(&qp->s_lock, flags);
 394         /* Notify hfi1_destroy_qp() if it is waiting. */
 395         rvt_put_qp(qp);
 396 }
 397
 398 static int iowait_sleep(
 399         struct sdma_engine *sde,
 400         struct iowait *wait,
 401         struct sdma_txreq *stx,
 402         uint seq,
 403         bool pkts_sent)
 404 {
 405         struct verbs_txreq *tx = container_of(stx, struct verbs_txreq, txreq);
 406         struct rvt_qp *qp;
 407         struct hfi1_qp_priv *priv;
 408         unsigned long flags;
 409         int ret = 0;
 410         struct hfi1_ibdev *dev;
 411
 412         qp = tx->qp;
 413         priv = qp->priv;
 414
 415         spin_lock_irqsave(&qp->s_lock, flags);
 416         if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
 417                 /*
 418                  * If we couldn't queue the DMA request, save the info
 419                  * and try again later rather than destroying the
 420                  * buffer and undoing the side effects of the copy.
 421                  */
 422                 /* Make a common routine? */
 423                 dev = &sde->dd->verbs_dev;
 424                 list_add_tail(&stx->list, &wait->tx_head);
 425                 write_seqlock(&dev->iowait_lock);
 426                 if (sdma_progress(sde, seq, stx))
 427                         goto eagain;
 428                 if (list_empty(&priv->s_iowait.list)) {
 429                         struct hfi1_ibport *ibp =
 430                                 to_iport(qp->ibqp.device, qp->port_num);
 431
 432                         ibp->rvp.n_dmawait++;
 433                         qp->s_flags |= RVT_S_WAIT_DMA_DESC;
 434                         iowait_queue(pkts_sent, &priv->s_iowait,
 435                                      &sde->dmawait);
 436                         priv->s_iowait.lock = &dev->iowait_lock;
 437                         trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
 438                         rvt_get_qp(qp);
 439                 }
 440                 write_sequnlock(&dev->iowait_lock);
 441                 qp->s_flags &= ~RVT_S_BUSY;
 442                 spin_unlock_irqrestore(&qp->s_lock, flags);
 443                 ret = -EBUSY;
 444         } else {
 445                 spin_unlock_irqrestore(&qp->s_lock, flags);
 446                 hfi1_put_txreq(tx);
 447         }
 448         return ret;
 449 eagain:
 450         write_sequnlock(&dev->iowait_lock);
 451         spin_unlock_irqrestore(&qp->s_lock, flags);
 452         list_del_init(&stx->list);
 453         return -EAGAIN;
 454 }
 455
 456 static void iowait_wakeup(struct iowait *wait, int reason)
 457 {
 458         struct rvt_qp *qp = iowait_to_qp(wait);
 459
 460         WARN_ON(reason != SDMA_AVAIL_REASON);
 461         hfi1_qp_wakeup(qp, RVT_S_WAIT_DMA_DESC);
 462 }
 463
 464 static void iowait_sdma_drained(struct iowait *wait)
 465 {
 466         struct rvt_qp *qp = iowait_to_qp(wait);
 467         unsigned long flags;
 468
 469         /*
 470          * This happens when the send engine notes
 471          * a QP in the error state and cannot
 472          * do the flush work until that QP's
 473          * sdma work has finished.
 474          */
 475         spin_lock_irqsave(&qp->s_lock, flags);
 476         if (qp->s_flags & RVT_S_WAIT_DMA) {
 477                 qp->s_flags &= ~RVT_S_WAIT_DMA;
 478                 hfi1_schedule_send(qp);
 479         }
 480         spin_unlock_irqrestore(&qp->s_lock, flags);
 481 }
 482
 483 /**
 484  *
 485  * qp_to_sdma_engine - map a qp to a send engine
 486  * @qp: the QP
 487  * @sc5: the 5 bit sc
 488  *
 489  * Return:
 490  * A send engine for the qp or NULL for SMI type qp.
 491  */
 492 struct sdma_engine *qp_to_sdma_engine(struct rvt_qp *qp, u8 sc5)
 493 {
 494         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 495         struct sdma_engine *sde;
 496
 497         if (!(dd->flags & HFI1_HAS_SEND_DMA))
 498                 return NULL;
 499         switch (qp->ibqp.qp_type) {
 500         case IB_QPT_SMI:
 501                 return NULL;
 502         default:
 503                 break;
 504         }
 505         sde = sdma_select_engine_sc(dd, qp->ibqp.qp_num >> dd->qos_shift, sc5);
 506         return sde;
 507 }
 508
 509 /*
 510  * qp_to_send_context - map a qp to a send context
 511  * @qp: the QP
 512  * @sc5: the 5 bit sc
 513  *
 514  * Return:
 515  * A send context for the qp
 516  */
 517 struct send_context *qp_to_send_context(struct rvt_qp *qp, u8 sc5)
 518 {
 519         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 520
 521         switch (qp->ibqp.qp_type) {
 522         case IB_QPT_SMI:
 523                 /* SMA packets to VL15 */
 524                 return dd->vld[15].sc;
 525         default:
 526                 break;
 527         }
 528
 529         return pio_select_send_context_sc(dd, qp->ibqp.qp_num >> dd->qos_shift,
 530                                           sc5);
 531 }
 532
 533 static const char * const qp_type_str[] = {
 534         "SMI", "GSI", "RC", "UC", "UD",
 535 };
 536
 537 static int qp_idle(struct rvt_qp *qp)
 538 {
 539         return
 540                 qp->s_last == qp->s_acked &&
 541                 qp->s_acked == qp->s_cur &&
 542                 qp->s_cur == qp->s_tail &&
 543                 qp->s_tail == qp->s_head;
 544 }
 545
 546 /**
 547  * qp_iter_print - print the qp information to seq_file
 548  * @s: the seq_file to emit the qp information on
 549  * @iter: the iterator for the qp hash list
 550  */
 551 void qp_iter_print(struct seq_file *s, struct rvt_qp_iter *iter)
 552 {
 553         struct rvt_swqe *wqe;
 554         struct rvt_qp *qp = iter->qp;
 555         struct hfi1_qp_priv *priv = qp->priv;
 556         struct sdma_engine *sde;
 557         struct send_context *send_context;
 558         struct rvt_ack_entry *e = NULL;
 559
 560         sde = qp_to_sdma_engine(qp, priv->s_sc);
 561         wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 562         send_context = qp_to_send_context(qp, priv->s_sc);
 563         if (qp->s_ack_queue)
 564                 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
 565         seq_printf(s,
 566                    "N %d %s QP %x R %u %s %u %u %u f=%x %u %u %u %u %u %u SPSN %x %x %x %x %x RPSN %x S(%u %u %u %u %u %u %u) R(%u %u %u) RQP %x LID %x SL %u MTU %u %u %u %u %u SDE %p,%u SC %p,%u SCQ %u %u PID %d OS %x %x E %x %x %x\n",
 567                    iter->n,
 568                    qp_idle(qp) ? "I" : "B",
 569                    qp->ibqp.qp_num,
 570                    atomic_read(&qp->refcount),
 571                    qp_type_str[qp->ibqp.qp_type],
 572                    qp->state,
 573                    wqe ? wqe->wr.opcode : 0,
 574                    qp->s_hdrwords,
 575                    qp->s_flags,
 576                    iowait_sdma_pending(&priv->s_iowait),
 577                    iowait_pio_pending(&priv->s_iowait),
 578                    !list_empty(&priv->s_iowait.list),
 579                    qp->timeout,
 580                    wqe ? wqe->ssn : 0,
 581                    qp->s_lsn,
 582                    qp->s_last_psn,
 583                    qp->s_psn, qp->s_next_psn,
 584                    qp->s_sending_psn, qp->s_sending_hpsn,
 585                    qp->r_psn,
 586                    qp->s_last, qp->s_acked, qp->s_cur,
 587                    qp->s_tail, qp->s_head, qp->s_size,
 588                    qp->s_avail,
 589                    /* ack_queue ring pointers, size */
 590                    qp->s_tail_ack_queue, qp->r_head_ack_queue,
 591                    rvt_max_atomic(&to_idev(qp->ibqp.device)->rdi),
 592                    /* remote QP info  */
 593                    qp->remote_qpn,
 594                    rdma_ah_get_dlid(&qp->remote_ah_attr),
 595                    rdma_ah_get_sl(&qp->remote_ah_attr),
 596                    qp->pmtu,
 597                    qp->s_retry,
 598                    qp->s_retry_cnt,
 599                    qp->s_rnr_retry_cnt,
 600                    qp->s_rnr_retry,
 601                    sde,
 602                    sde ? sde->this_idx : 0,
 603                    send_context,
 604                    send_context ? send_context->sw_index : 0,
 605                    ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->head,
 606                    ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->tail,
 607                    qp->pid,
 608                    qp->s_state,
 609                    qp->s_ack_state,
 610                    /* ack queue information */
 611                    e ? e->opcode : 0,
 612                    e ? e->psn : 0,
 613                    e ? e->lpsn : 0);
 614 }
 615
 616 void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 617 {
 618         struct hfi1_qp_priv *priv;
 619
 620         priv = kzalloc_node(sizeof(*priv), GFP_KERNEL, rdi->dparms.node);
 621         if (!priv)
 622                 return ERR_PTR(-ENOMEM);
 623
 624         priv->owner = qp;
 625
 626         priv->s_ahg = kzalloc_node(sizeof(*priv->s_ahg), GFP_KERNEL,
 627                                    rdi->dparms.node);
 628         if (!priv->s_ahg) {
 629                 kfree(priv);
 630                 return ERR_PTR(-ENOMEM);
 631         }
 632         iowait_init(
 633                 &priv->s_iowait,
 634                 1,
 635                 _hfi1_do_send,
 636                 iowait_sleep,
 637                 iowait_wakeup,
 638                 iowait_sdma_drained);
 639         return priv;
 640 }
 641
 642 void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 643 {
 644         struct hfi1_qp_priv *priv = qp->priv;
 645
 646         kfree(priv->s_ahg);
 647         kfree(priv);
 648 }
 649
 650 unsigned free_all_qps(struct rvt_dev_info *rdi)
 651 {
 652         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 653                                                     struct hfi1_ibdev,
 654                                                     rdi);
 655         struct hfi1_devdata *dd = container_of(verbs_dev,
 656                                                struct hfi1_devdata,
 657                                                verbs_dev);
 658         int n;
 659         unsigned qp_inuse = 0;
 660
 661         for (n = 0; n < dd->num_pports; n++) {
 662                 struct hfi1_ibport *ibp = &dd->pport[n].ibport_data;
 663
 664                 rcu_read_lock();
 665                 if (rcu_dereference(ibp->rvp.qp[0]))
 666                         qp_inuse++;
 667                 if (rcu_dereference(ibp->rvp.qp[1]))
 668                         qp_inuse++;
 669                 rcu_read_unlock();
 670         }
 671
 672         return qp_inuse;
 673 }
 674
 675 void flush_qp_waiters(struct rvt_qp *qp)
 676 {
 677         lockdep_assert_held(&qp->s_lock);
 678         flush_iowait(qp);
 679 }
 680
 681 void stop_send_queue(struct rvt_qp *qp)
 682 {
 683         struct hfi1_qp_priv *priv = qp->priv;
 684
 685         cancel_work_sync(&priv->s_iowait.iowork);
 686 }
 687
 688 void quiesce_qp(struct rvt_qp *qp)
 689 {
 690         struct hfi1_qp_priv *priv = qp->priv;
 691
 692         iowait_sdma_drain(&priv->s_iowait);
 693         qp_pio_drain(qp);
 694         flush_tx_list(qp);
 695 }
 696
 697 void notify_qp_reset(struct rvt_qp *qp)
 698 {
 699         qp->r_adefered = 0;
 700         clear_ahg(qp);
 701 }
 702
 703 /*
 704  * Switch to alternate path.
 705  * The QP s_lock should be held and interrupts disabled.
 706  */
 707 void hfi1_migrate_qp(struct rvt_qp *qp)
 708 {
 709         struct hfi1_qp_priv *priv = qp->priv;
 710         struct ib_event ev;
 711
 712         qp->s_mig_state = IB_MIG_MIGRATED;
 713         qp->remote_ah_attr = qp->alt_ah_attr;
 714         qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
 715         qp->s_pkey_index = qp->s_alt_pkey_index;
 716         qp->s_flags |= RVT_S_AHG_CLEAR;
 717         priv->s_sc = ah_to_sc(qp->ibqp.device, &qp->remote_ah_attr);
 718         priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 719         qp_set_16b(qp);
 720
 721         ev.device = qp->ibqp.device;
 722         ev.element.qp = &qp->ibqp;
 723         ev.event = IB_EVENT_PATH_MIG;
 724         qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 725 }
 726
 727 int mtu_to_path_mtu(u32 mtu)
 728 {
 729         return mtu_to_enum(mtu, OPA_MTU_8192);
 730 }
 731
 732 u32 mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
 733 {
 734         u32 mtu;
 735         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 736                                                     struct hfi1_ibdev,
 737                                                     rdi);
 738         struct hfi1_devdata *dd = container_of(verbs_dev,
 739                                                struct hfi1_devdata,
 740                                                verbs_dev);
 741         struct hfi1_ibport *ibp;
 742         u8 sc, vl;
 743
 744         ibp = &dd->pport[qp->port_num - 1].ibport_data;
 745         sc = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
 746         vl = sc_to_vlt(dd, sc);
 747
 748         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, pmtu);
 749         if (vl < PER_VL_SEND_CONTEXTS)
 750                 mtu = min_t(u32, mtu, dd->vld[vl].mtu);
 751         return mtu;
 752 }
 753
 754 int get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 755                        struct ib_qp_attr *attr)
 756 {
 757         int mtu, pidx = qp->port_num - 1;
 758         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 759                                                     struct hfi1_ibdev,
 760                                                     rdi);
 761         struct hfi1_devdata *dd = container_of(verbs_dev,
 762                                                struct hfi1_devdata,
 763                                                verbs_dev);
 764         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, attr->path_mtu);
 765         if (mtu == -1)
 766                 return -1; /* values less than 0 are error */
 767
 768         if (mtu > dd->pport[pidx].ibmtu)
 769                 return mtu_to_enum(dd->pport[pidx].ibmtu, IB_MTU_2048);
 770         else
 771                 return attr->path_mtu;
 772 }
 773
 774 void notify_error_qp(struct rvt_qp *qp)
 775 {
 776         struct hfi1_qp_priv *priv = qp->priv;
 777         seqlock_t *lock = priv->s_iowait.lock;
 778
 779         if (lock) {
 780                 write_seqlock(lock);
 781                 if (!list_empty(&priv->s_iowait.list) &&
 782                     !(qp->s_flags & RVT_S_BUSY)) {
 783                         qp->s_flags &= ~RVT_S_ANY_WAIT_IO;
 784                         list_del_init(&priv->s_iowait.list);
 785                         priv->s_iowait.lock = NULL;
 786                         rvt_put_qp(qp);
 787                 }
 788                 write_sequnlock(lock);
 789         }
 790
 791         if (!(qp->s_flags & RVT_S_BUSY)) {
 792                 qp->s_hdrwords = 0;
 793                 if (qp->s_rdma_mr) {
 794                         rvt_put_mr(qp->s_rdma_mr);
 795                         qp->s_rdma_mr = NULL;
 796                 }
 797                 flush_tx_list(qp);
 798         }
 799 }
 800
 801 /**
 802  * hfi1_qp_iter_cb - callback for iterator
 803  * @qp - the qp
 804  * @v - the sl in low bits of v
 805  *
 806  * This is called from the iterator callback to work
 807  * on an individual qp.
 808  */
 809 static void hfi1_qp_iter_cb(struct rvt_qp *qp, u64 v)
 810 {
 811         int lastwqe;
 812         struct ib_event ev;
 813         struct hfi1_ibport *ibp =
 814                 to_iport(qp->ibqp.device, qp->port_num);
 815         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 816         u8 sl = (u8)v;
 817
 818         if (qp->port_num != ppd->port ||
 819             (qp->ibqp.qp_type != IB_QPT_UC &&
 820              qp->ibqp.qp_type != IB_QPT_RC) ||
 821             rdma_ah_get_sl(&qp->remote_ah_attr) != sl ||
 822             !(ib_rvt_state_ops[qp->state] & RVT_POST_SEND_OK))
 823                 return;
 824
 825         spin_lock_irq(&qp->r_lock);
 826         spin_lock(&qp->s_hlock);
 827         spin_lock(&qp->s_lock);
 828         lastwqe = rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
 829         spin_unlock(&qp->s_lock);
 830         spin_unlock(&qp->s_hlock);
 831         spin_unlock_irq(&qp->r_lock);
 832         if (lastwqe) {
 833                 ev.device = qp->ibqp.device;
 834                 ev.element.qp = &qp->ibqp;
 835                 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
 836                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 837         }
 838 }
 839
 840 /**
 841  * hfi1_error_port_qps - put a port's RC/UC qps into error state
 842  * @ibp: the ibport.
 843  * @sl: the service level.
 844  *
 845  * This function places all RC/UC qps with a given service level into error
 846  * state. It is generally called to force upper lay apps to abandon stale qps
 847  * after an sl->sc mapping change.
 848  */
 849 void hfi1_error_port_qps(struct hfi1_ibport *ibp, u8 sl)
 850 {
 851         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 852         struct hfi1_ibdev *dev = &ppd->dd->verbs_dev;
 853
 854         rvt_qp_iter(&dev->rdi, sl, hfi1_qp_iter_cb);
 855 }