drivers/infiniband/hw/hfi1/qp.c

   1 /*
   2  * Copyright(c) 2015, 2016 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 seq);
  72 static void iowait_wakeup(struct iowait *wait, int reason);
  73 static void iowait_sdma_drained(struct iowait *wait);
  74 static void qp_pio_drain(struct rvt_qp *qp);
  75
  76 static inline unsigned mk_qpn(struct rvt_qpn_table *qpt,
  77                               struct rvt_qpn_map *map, unsigned off)
  78 {
  79         return (map - qpt->map) * RVT_BITS_PER_PAGE + off;
  80 }
  81
  82 /*
  83  * Convert the AETH credit code into the number of credits.
  84  */
  85 static const u16 credit_table[31] = {
  86         0,                      /* 0 */
  87         1,                      /* 1 */
  88         2,                      /* 2 */
  89         3,                      /* 3 */
  90         4,                      /* 4 */
  91         6,                      /* 5 */
  92         8,                      /* 6 */
  93         12,                     /* 7 */
  94         16,                     /* 8 */
  95         24,                     /* 9 */
  96         32,                     /* A */
  97         48,                     /* B */
  98         64,                     /* C */
  99         96,                     /* D */
 100         128,                    /* E */
 101         192,                    /* F */
 102         256,                    /* 10 */
 103         384,                    /* 11 */
 104         512,                    /* 12 */
 105         768,                    /* 13 */
 106         1024,                   /* 14 */
 107         1536,                   /* 15 */
 108         2048,                   /* 16 */
 109         3072,                   /* 17 */
 110         4096,                   /* 18 */
 111         6144,                   /* 19 */
 112         8192,                   /* 1A */
 113         12288,                  /* 1B */
 114         16384,                  /* 1C */
 115         24576,                  /* 1D */
 116         32768                   /* 1E */
 117 };
 118
 119 const struct rvt_operation_params hfi1_post_parms[RVT_OPERATION_MAX] = {
 120 [IB_WR_RDMA_WRITE] = {
 121         .length = sizeof(struct ib_rdma_wr),
 122         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 123 },
 124
 125 [IB_WR_RDMA_READ] = {
 126         .length = sizeof(struct ib_rdma_wr),
 127         .qpt_support = BIT(IB_QPT_RC),
 128         .flags = RVT_OPERATION_ATOMIC,
 129 },
 130
 131 [IB_WR_ATOMIC_CMP_AND_SWP] = {
 132         .length = sizeof(struct ib_atomic_wr),
 133         .qpt_support = BIT(IB_QPT_RC),
 134         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
 135 },
 136
 137 [IB_WR_ATOMIC_FETCH_AND_ADD] = {
 138         .length = sizeof(struct ib_atomic_wr),
 139         .qpt_support = BIT(IB_QPT_RC),
 140         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
 141 },
 142
 143 [IB_WR_RDMA_WRITE_WITH_IMM] = {
 144         .length = sizeof(struct ib_rdma_wr),
 145         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 146 },
 147
 148 [IB_WR_SEND] = {
 149         .length = sizeof(struct ib_send_wr),
 150         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
 151                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 152 },
 153
 154 [IB_WR_SEND_WITH_IMM] = {
 155         .length = sizeof(struct ib_send_wr),
 156         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
 157                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 158 },
 159
 160 [IB_WR_REG_MR] = {
 161         .length = sizeof(struct ib_reg_wr),
 162         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 163         .flags = RVT_OPERATION_LOCAL,
 164 },
 165
 166 [IB_WR_LOCAL_INV] = {
 167         .length = sizeof(struct ib_send_wr),
 168         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 169         .flags = RVT_OPERATION_LOCAL,
 170 },
 171
 172 [IB_WR_SEND_WITH_INV] = {
 173         .length = sizeof(struct ib_send_wr),
 174         .qpt_support = BIT(IB_QPT_RC),
 175 },
 176
 177 };
 178
 179 static void flush_tx_list(struct rvt_qp *qp)
 180 {
 181         struct hfi1_qp_priv *priv = qp->priv;
 182
 183         while (!list_empty(&priv->s_iowait.tx_head)) {
 184                 struct sdma_txreq *tx;
 185
 186                 tx = list_first_entry(
 187                         &priv->s_iowait.tx_head,
 188                         struct sdma_txreq,
 189                         list);
 190                 list_del_init(&tx->list);
 191                 hfi1_put_txreq(
 192                         container_of(tx, struct verbs_txreq, txreq));
 193         }
 194 }
 195
 196 static void flush_iowait(struct rvt_qp *qp)
 197 {
 198         struct hfi1_qp_priv *priv = qp->priv;
 199         struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
 200         unsigned long flags;
 201
 202         write_seqlock_irqsave(&dev->iowait_lock, flags);
 203         if (!list_empty(&priv->s_iowait.list)) {
 204                 list_del_init(&priv->s_iowait.list);
 205                 rvt_put_qp(qp);
 206         }
 207         write_sequnlock_irqrestore(&dev->iowait_lock, flags);
 208 }
 209
 210 static inline int opa_mtu_enum_to_int(int mtu)
 211 {
 212         switch (mtu) {
 213         case OPA_MTU_8192:  return 8192;
 214         case OPA_MTU_10240: return 10240;
 215         default:            return -1;
 216         }
 217 }
 218
 219 /**
 220  * This function is what we would push to the core layer if we wanted to be a
 221  * "first class citizen".  Instead we hide this here and rely on Verbs ULPs
 222  * to blindly pass the MTU enum value from the PathRecord to us.
 223  */
 224 static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
 225 {
 226         int val;
 227
 228         /* Constraining 10KB packets to 8KB packets */
 229         if (mtu == (enum ib_mtu)OPA_MTU_10240)
 230                 mtu = OPA_MTU_8192;
 231         val = opa_mtu_enum_to_int((int)mtu);
 232         if (val > 0)
 233                 return val;
 234         return ib_mtu_enum_to_int(mtu);
 235 }
 236
 237 int hfi1_check_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 238                          int attr_mask, struct ib_udata *udata)
 239 {
 240         struct ib_qp *ibqp = &qp->ibqp;
 241         struct hfi1_ibdev *dev = to_idev(ibqp->device);
 242         struct hfi1_devdata *dd = dd_from_dev(dev);
 243         u8 sc;
 244
 245         if (attr_mask & IB_QP_AV) {
 246                 sc = ah_to_sc(ibqp->device, &attr->ah_attr);
 247                 if (sc == 0xf)
 248                         return -EINVAL;
 249
 250                 if (!qp_to_sdma_engine(qp, sc) &&
 251                     dd->flags & HFI1_HAS_SEND_DMA)
 252                         return -EINVAL;
 253
 254                 if (!qp_to_send_context(qp, sc))
 255                         return -EINVAL;
 256         }
 257
 258         if (attr_mask & IB_QP_ALT_PATH) {
 259                 sc = ah_to_sc(ibqp->device, &attr->alt_ah_attr);
 260                 if (sc == 0xf)
 261                         return -EINVAL;
 262
 263                 if (!qp_to_sdma_engine(qp, sc) &&
 264                     dd->flags & HFI1_HAS_SEND_DMA)
 265                         return -EINVAL;
 266
 267                 if (!qp_to_send_context(qp, sc))
 268                         return -EINVAL;
 269         }
 270
 271         return 0;
 272 }
 273
 274 void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 275                     int attr_mask, struct ib_udata *udata)
 276 {
 277         struct ib_qp *ibqp = &qp->ibqp;
 278         struct hfi1_qp_priv *priv = qp->priv;
 279
 280         if (attr_mask & IB_QP_AV) {
 281                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 282                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 283                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 284         }
 285
 286         if (attr_mask & IB_QP_PATH_MIG_STATE &&
 287             attr->path_mig_state == IB_MIG_MIGRATED &&
 288             qp->s_mig_state == IB_MIG_ARMED) {
 289                 qp->s_flags |= RVT_S_AHG_CLEAR;
 290                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 291                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 292                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 293         }
 294 }
 295
 296 /**
 297  * hfi1_check_send_wqe - validate wqe
 298  * @qp - The qp
 299  * @wqe - The built wqe
 300  *
 301  * validate wqe.  This is called
 302  * prior to inserting the wqe into
 303  * the ring but after the wqe has been
 304  * setup.
 305  *
 306  * Returns 0 on success, -EINVAL on failure
 307  *
 308  */
 309 int hfi1_check_send_wqe(struct rvt_qp *qp,
 310                         struct rvt_swqe *wqe)
 311 {
 312         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 313         struct rvt_ah *ah;
 314
 315         switch (qp->ibqp.qp_type) {
 316         case IB_QPT_RC:
 317         case IB_QPT_UC:
 318                 if (wqe->length > 0x80000000U)
 319                         return -EINVAL;
 320                 break;
 321         case IB_QPT_SMI:
 322                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 323                 if (wqe->length > (1 << ah->log_pmtu))
 324                         return -EINVAL;
 325                 break;
 326         case IB_QPT_GSI:
 327         case IB_QPT_UD:
 328                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 329                 if (wqe->length > (1 << ah->log_pmtu))
 330                         return -EINVAL;
 331                 if (ibp->sl_to_sc[ah->attr.sl] == 0xf)
 332                         return -EINVAL;
 333         default:
 334                 break;
 335         }
 336         return wqe->length <= piothreshold;
 337 }
 338
 339 /**
 340  * hfi1_compute_aeth - compute the AETH (syndrome + MSN)
 341  * @qp: the queue pair to compute the AETH for
 342  *
 343  * Returns the AETH.
 344  */
 345 __be32 hfi1_compute_aeth(struct rvt_qp *qp)
 346 {
 347         u32 aeth = qp->r_msn & HFI1_MSN_MASK;
 348
 349         if (qp->ibqp.srq) {
 350                 /*
 351                  * Shared receive queues don't generate credits.
 352                  * Set the credit field to the invalid value.
 353                  */
 354                 aeth |= HFI1_AETH_CREDIT_INVAL << HFI1_AETH_CREDIT_SHIFT;
 355         } else {
 356                 u32 min, max, x;
 357                 u32 credits;
 358                 struct rvt_rwq *wq = qp->r_rq.wq;
 359                 u32 head;
 360                 u32 tail;
 361
 362                 /* sanity check pointers before trusting them */
 363                 head = wq->head;
 364                 if (head >= qp->r_rq.size)
 365                         head = 0;
 366                 tail = wq->tail;
 367                 if (tail >= qp->r_rq.size)
 368                         tail = 0;
 369                 /*
 370                  * Compute the number of credits available (RWQEs).
 371                  * There is a small chance that the pair of reads are
 372                  * not atomic, which is OK, since the fuzziness is
 373                  * resolved as further ACKs go out.
 374                  */
 375                 credits = head - tail;
 376                 if ((int)credits < 0)
 377                         credits += qp->r_rq.size;
 378                 /*
 379                  * Binary search the credit table to find the code to
 380                  * use.
 381                  */
 382                 min = 0;
 383                 max = 31;
 384                 for (;;) {
 385                         x = (min + max) / 2;
 386                         if (credit_table[x] == credits)
 387                                 break;
 388                         if (credit_table[x] > credits) {
 389                                 max = x;
 390                         } else {
 391                                 if (min == x)
 392                                         break;
 393                                 min = x;
 394                         }
 395                 }
 396                 aeth |= x << HFI1_AETH_CREDIT_SHIFT;
 397         }
 398         return cpu_to_be32(aeth);
 399 }
 400
 401 /**
 402  * _hfi1_schedule_send - schedule progress
 403  * @qp: the QP
 404  *
 405  * This schedules qp progress w/o regard to the s_flags.
 406  *
 407  * It is only used in the post send, which doesn't hold
 408  * the s_lock.
 409  */
 410 void _hfi1_schedule_send(struct rvt_qp *qp)
 411 {
 412         struct hfi1_qp_priv *priv = qp->priv;
 413         struct hfi1_ibport *ibp =
 414                 to_iport(qp->ibqp.device, qp->port_num);
 415         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 416         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 417
 418         iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
 419                         priv->s_sde ?
 420                         priv->s_sde->cpu :
 421                         cpumask_first(cpumask_of_node(dd->node)));
 422 }
 423
 424 static void qp_pio_drain(struct rvt_qp *qp)
 425 {
 426         struct hfi1_ibdev *dev;
 427         struct hfi1_qp_priv *priv = qp->priv;
 428
 429         if (!priv->s_sendcontext)
 430                 return;
 431         dev = to_idev(qp->ibqp.device);
 432         while (iowait_pio_pending(&priv->s_iowait)) {
 433                 write_seqlock_irq(&dev->iowait_lock);
 434                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 1);
 435                 write_sequnlock_irq(&dev->iowait_lock);
 436                 iowait_pio_drain(&priv->s_iowait);
 437                 write_seqlock_irq(&dev->iowait_lock);
 438                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 0);
 439                 write_sequnlock_irq(&dev->iowait_lock);
 440         }
 441 }
 442
 443 /**
 444  * hfi1_schedule_send - schedule progress
 445  * @qp: the QP
 446  *
 447  * This schedules qp progress and caller should hold
 448  * the s_lock.
 449  */
 450 void hfi1_schedule_send(struct rvt_qp *qp)
 451 {
 452         lockdep_assert_held(&qp->s_lock);
 453         if (hfi1_send_ok(qp))
 454                 _hfi1_schedule_send(qp);
 455 }
 456
 457 /**
 458  * hfi1_get_credit - handle credit in aeth
 459  * @qp: the qp
 460  * @aeth: the Acknowledge Extended Transport Header
 461  *
 462  * The QP s_lock should be held.
 463  */
 464 void hfi1_get_credit(struct rvt_qp *qp, u32 aeth)
 465 {
 466         u32 credit = (aeth >> HFI1_AETH_CREDIT_SHIFT) & HFI1_AETH_CREDIT_MASK;
 467
 468         lockdep_assert_held(&qp->s_lock);
 469         /*
 470          * If the credit is invalid, we can send
 471          * as many packets as we like.  Otherwise, we have to
 472          * honor the credit field.
 473          */
 474         if (credit == HFI1_AETH_CREDIT_INVAL) {
 475                 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) {
 476                         qp->s_flags |= RVT_S_UNLIMITED_CREDIT;
 477                         if (qp->s_flags & RVT_S_WAIT_SSN_CREDIT) {
 478                                 qp->s_flags &= ~RVT_S_WAIT_SSN_CREDIT;
 479                                 hfi1_schedule_send(qp);
 480                         }
 481                 }
 482         } else if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) {
 483                 /* Compute new LSN (i.e., MSN + credit) */
 484                 credit = (aeth + credit_table[credit]) & HFI1_MSN_MASK;
 485                 if (cmp_msn(credit, qp->s_lsn) > 0) {
 486                         qp->s_lsn = credit;
 487                         if (qp->s_flags & RVT_S_WAIT_SSN_CREDIT) {
 488                                 qp->s_flags &= ~RVT_S_WAIT_SSN_CREDIT;
 489                                 hfi1_schedule_send(qp);
 490                         }
 491                 }
 492         }
 493 }
 494
 495 void hfi1_qp_wakeup(struct rvt_qp *qp, u32 flag)
 496 {
 497         unsigned long flags;
 498
 499         spin_lock_irqsave(&qp->s_lock, flags);
 500         if (qp->s_flags & flag) {
 501                 qp->s_flags &= ~flag;
 502                 trace_hfi1_qpwakeup(qp, flag);
 503                 hfi1_schedule_send(qp);
 504         }
 505         spin_unlock_irqrestore(&qp->s_lock, flags);
 506         /* Notify hfi1_destroy_qp() if it is waiting. */
 507         rvt_put_qp(qp);
 508 }
 509
 510 static int iowait_sleep(
 511         struct sdma_engine *sde,
 512         struct iowait *wait,
 513         struct sdma_txreq *stx,
 514         unsigned seq)
 515 {
 516         struct verbs_txreq *tx = container_of(stx, struct verbs_txreq, txreq);
 517         struct rvt_qp *qp;
 518         struct hfi1_qp_priv *priv;
 519         unsigned long flags;
 520         int ret = 0;
 521         struct hfi1_ibdev *dev;
 522
 523         qp = tx->qp;
 524         priv = qp->priv;
 525
 526         spin_lock_irqsave(&qp->s_lock, flags);
 527         if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
 528                 /*
 529                  * If we couldn't queue the DMA request, save the info
 530                  * and try again later rather than destroying the
 531                  * buffer and undoing the side effects of the copy.
 532                  */
 533                 /* Make a common routine? */
 534                 dev = &sde->dd->verbs_dev;
 535                 list_add_tail(&stx->list, &wait->tx_head);
 536                 write_seqlock(&dev->iowait_lock);
 537                 if (sdma_progress(sde, seq, stx))
 538                         goto eagain;
 539                 if (list_empty(&priv->s_iowait.list)) {
 540                         struct hfi1_ibport *ibp =
 541                                 to_iport(qp->ibqp.device, qp->port_num);
 542
 543                         ibp->rvp.n_dmawait++;
 544                         qp->s_flags |= RVT_S_WAIT_DMA_DESC;
 545                         list_add_tail(&priv->s_iowait.list, &sde->dmawait);
 546                         trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
 547                         rvt_get_qp(qp);
 548                 }
 549                 write_sequnlock(&dev->iowait_lock);
 550                 qp->s_flags &= ~RVT_S_BUSY;
 551                 spin_unlock_irqrestore(&qp->s_lock, flags);
 552                 ret = -EBUSY;
 553         } else {
 554                 spin_unlock_irqrestore(&qp->s_lock, flags);
 555                 hfi1_put_txreq(tx);
 556         }
 557         return ret;
 558 eagain:
 559         write_sequnlock(&dev->iowait_lock);
 560         spin_unlock_irqrestore(&qp->s_lock, flags);
 561         list_del_init(&stx->list);
 562         return -EAGAIN;
 563 }
 564
 565 static void iowait_wakeup(struct iowait *wait, int reason)
 566 {
 567         struct rvt_qp *qp = iowait_to_qp(wait);
 568
 569         WARN_ON(reason != SDMA_AVAIL_REASON);
 570         hfi1_qp_wakeup(qp, RVT_S_WAIT_DMA_DESC);
 571 }
 572
 573 static void iowait_sdma_drained(struct iowait *wait)
 574 {
 575         struct rvt_qp *qp = iowait_to_qp(wait);
 576         unsigned long flags;
 577
 578         /*
 579          * This happens when the send engine notes
 580          * a QP in the error state and cannot
 581          * do the flush work until that QP's
 582          * sdma work has finished.
 583          */
 584         spin_lock_irqsave(&qp->s_lock, flags);
 585         if (qp->s_flags & RVT_S_WAIT_DMA) {
 586                 qp->s_flags &= ~RVT_S_WAIT_DMA;
 587                 hfi1_schedule_send(qp);
 588         }
 589         spin_unlock_irqrestore(&qp->s_lock, flags);
 590 }
 591
 592 /**
 593  *
 594  * qp_to_sdma_engine - map a qp to a send engine
 595  * @qp: the QP
 596  * @sc5: the 5 bit sc
 597  *
 598  * Return:
 599  * A send engine for the qp or NULL for SMI type qp.
 600  */
 601 struct sdma_engine *qp_to_sdma_engine(struct rvt_qp *qp, u8 sc5)
 602 {
 603         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 604         struct sdma_engine *sde;
 605
 606         if (!(dd->flags & HFI1_HAS_SEND_DMA))
 607                 return NULL;
 608         switch (qp->ibqp.qp_type) {
 609         case IB_QPT_SMI:
 610                 return NULL;
 611         default:
 612                 break;
 613         }
 614         sde = sdma_select_engine_sc(dd, qp->ibqp.qp_num >> dd->qos_shift, sc5);
 615         return sde;
 616 }
 617
 618 /*
 619  * qp_to_send_context - map a qp to a send context
 620  * @qp: the QP
 621  * @sc5: the 5 bit sc
 622  *
 623  * Return:
 624  * A send context for the qp
 625  */
 626 struct send_context *qp_to_send_context(struct rvt_qp *qp, u8 sc5)
 627 {
 628         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 629
 630         switch (qp->ibqp.qp_type) {
 631         case IB_QPT_SMI:
 632                 /* SMA packets to VL15 */
 633                 return dd->vld[15].sc;
 634         default:
 635                 break;
 636         }
 637
 638         return pio_select_send_context_sc(dd, qp->ibqp.qp_num >> dd->qos_shift,
 639                                           sc5);
 640 }
 641
 642 struct qp_iter {
 643         struct hfi1_ibdev *dev;
 644         struct rvt_qp *qp;
 645         int specials;
 646         int n;
 647 };
 648
 649 struct qp_iter *qp_iter_init(struct hfi1_ibdev *dev)
 650 {
 651         struct qp_iter *iter;
 652
 653         iter = kzalloc(sizeof(*iter), GFP_KERNEL);
 654         if (!iter)
 655                 return NULL;
 656
 657         iter->dev = dev;
 658         iter->specials = dev->rdi.ibdev.phys_port_cnt * 2;
 659
 660         return iter;
 661 }
 662
 663 int qp_iter_next(struct qp_iter *iter)
 664 {
 665         struct hfi1_ibdev *dev = iter->dev;
 666         int n = iter->n;
 667         int ret = 1;
 668         struct rvt_qp *pqp = iter->qp;
 669         struct rvt_qp *qp;
 670
 671         /*
 672          * The approach is to consider the special qps
 673          * as an additional table entries before the
 674          * real hash table.  Since the qp code sets
 675          * the qp->next hash link to NULL, this works just fine.
 676          *
 677          * iter->specials is 2 * # ports
 678          *
 679          * n = 0..iter->specials is the special qp indices
 680          *
 681          * n = iter->specials..dev->rdi.qp_dev->qp_table_size+iter->specials are
 682          * the potential hash bucket entries
 683          *
 684          */
 685         for (; n <  dev->rdi.qp_dev->qp_table_size + iter->specials; n++) {
 686                 if (pqp) {
 687                         qp = rcu_dereference(pqp->next);
 688                 } else {
 689                         if (n < iter->specials) {
 690                                 struct hfi1_pportdata *ppd;
 691                                 struct hfi1_ibport *ibp;
 692                                 int pidx;
 693
 694                                 pidx = n % dev->rdi.ibdev.phys_port_cnt;
 695                                 ppd = &dd_from_dev(dev)->pport[pidx];
 696                                 ibp = &ppd->ibport_data;
 697
 698                                 if (!(n & 1))
 699                                         qp = rcu_dereference(ibp->rvp.qp[0]);
 700                                 else
 701                                         qp = rcu_dereference(ibp->rvp.qp[1]);
 702                         } else {
 703                                 qp = rcu_dereference(
 704                                         dev->rdi.qp_dev->qp_table[
 705                                                 (n - iter->specials)]);
 706                         }
 707                 }
 708                 pqp = qp;
 709                 if (qp) {
 710                         iter->qp = qp;
 711                         iter->n = n;
 712                         return 0;
 713                 }
 714         }
 715         return ret;
 716 }
 717
 718 static const char * const qp_type_str[] = {
 719         "SMI", "GSI", "RC", "UC", "UD",
 720 };
 721
 722 static int qp_idle(struct rvt_qp *qp)
 723 {
 724         return
 725                 qp->s_last == qp->s_acked &&
 726                 qp->s_acked == qp->s_cur &&
 727                 qp->s_cur == qp->s_tail &&
 728                 qp->s_tail == qp->s_head;
 729 }
 730
 731 void qp_iter_print(struct seq_file *s, struct qp_iter *iter)
 732 {
 733         struct rvt_swqe *wqe;
 734         struct rvt_qp *qp = iter->qp;
 735         struct hfi1_qp_priv *priv = qp->priv;
 736         struct sdma_engine *sde;
 737         struct send_context *send_context;
 738
 739         sde = qp_to_sdma_engine(qp, priv->s_sc);
 740         wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 741         send_context = qp_to_send_context(qp, priv->s_sc);
 742         seq_printf(s,
 743                    "N %d %s QP %x R %u %s %u %u %u f=%x %u %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u %u) RQP %x LID %x SL %u MTU %u %u %u %u SDE %p,%u SC %p,%u SCQ %u %u PID %d\n",
 744                    iter->n,
 745                    qp_idle(qp) ? "I" : "B",
 746                    qp->ibqp.qp_num,
 747                    atomic_read(&qp->refcount),
 748                    qp_type_str[qp->ibqp.qp_type],
 749                    qp->state,
 750                    wqe ? wqe->wr.opcode : 0,
 751                    qp->s_hdrwords,
 752                    qp->s_flags,
 753                    iowait_sdma_pending(&priv->s_iowait),
 754                    iowait_pio_pending(&priv->s_iowait),
 755                    !list_empty(&priv->s_iowait.list),
 756                    qp->timeout,
 757                    wqe ? wqe->ssn : 0,
 758                    qp->s_lsn,
 759                    qp->s_last_psn,
 760                    qp->s_psn, qp->s_next_psn,
 761                    qp->s_sending_psn, qp->s_sending_hpsn,
 762                    qp->s_last, qp->s_acked, qp->s_cur,
 763                    qp->s_tail, qp->s_head, qp->s_size,
 764                    qp->s_avail,
 765                    qp->remote_qpn,
 766                    qp->remote_ah_attr.dlid,
 767                    qp->remote_ah_attr.sl,
 768                    qp->pmtu,
 769                    qp->s_retry,
 770                    qp->s_retry_cnt,
 771                    qp->s_rnr_retry_cnt,
 772                    sde,
 773                    sde ? sde->this_idx : 0,
 774                    send_context,
 775                    send_context ? send_context->sw_index : 0,
 776                    ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->head,
 777                    ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->tail,
 778                    qp->pid);
 779 }
 780
 781 void qp_comm_est(struct rvt_qp *qp)
 782 {
 783         qp->r_flags |= RVT_R_COMM_EST;
 784         if (qp->ibqp.event_handler) {
 785                 struct ib_event ev;
 786
 787                 ev.device = qp->ibqp.device;
 788                 ev.element.qp = &qp->ibqp;
 789                 ev.event = IB_EVENT_COMM_EST;
 790                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 791         }
 792 }
 793
 794 void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 795                     gfp_t gfp)
 796 {
 797         struct hfi1_qp_priv *priv;
 798
 799         priv = kzalloc_node(sizeof(*priv), gfp, rdi->dparms.node);
 800         if (!priv)
 801                 return ERR_PTR(-ENOMEM);
 802
 803         priv->owner = qp;
 804
 805         priv->s_ahg = kzalloc_node(sizeof(*priv->s_ahg), gfp,
 806                                    rdi->dparms.node);
 807         if (!priv->s_ahg) {
 808                 kfree(priv);
 809                 return ERR_PTR(-ENOMEM);
 810         }
 811         iowait_init(
 812                 &priv->s_iowait,
 813                 1,
 814                 _hfi1_do_send,
 815                 iowait_sleep,
 816                 iowait_wakeup,
 817                 iowait_sdma_drained);
 818         setup_timer(&priv->s_rnr_timer, hfi1_rc_rnr_retry, (unsigned long)qp);
 819         qp->s_timer.function = hfi1_rc_timeout;
 820         return priv;
 821 }
 822
 823 void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 824 {
 825         struct hfi1_qp_priv *priv = qp->priv;
 826
 827         kfree(priv->s_ahg);
 828         kfree(priv);
 829 }
 830
 831 unsigned free_all_qps(struct rvt_dev_info *rdi)
 832 {
 833         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 834                                                     struct hfi1_ibdev,
 835                                                     rdi);
 836         struct hfi1_devdata *dd = container_of(verbs_dev,
 837                                                struct hfi1_devdata,
 838                                                verbs_dev);
 839         int n;
 840         unsigned qp_inuse = 0;
 841
 842         for (n = 0; n < dd->num_pports; n++) {
 843                 struct hfi1_ibport *ibp = &dd->pport[n].ibport_data;
 844
 845                 rcu_read_lock();
 846                 if (rcu_dereference(ibp->rvp.qp[0]))
 847                         qp_inuse++;
 848                 if (rcu_dereference(ibp->rvp.qp[1]))
 849                         qp_inuse++;
 850                 rcu_read_unlock();
 851         }
 852
 853         return qp_inuse;
 854 }
 855
 856 void flush_qp_waiters(struct rvt_qp *qp)
 857 {
 858         lockdep_assert_held(&qp->s_lock);
 859         flush_iowait(qp);
 860         hfi1_stop_rc_timers(qp);
 861 }
 862
 863 void stop_send_queue(struct rvt_qp *qp)
 864 {
 865         struct hfi1_qp_priv *priv = qp->priv;
 866
 867         cancel_work_sync(&priv->s_iowait.iowork);
 868         hfi1_del_timers_sync(qp);
 869 }
 870
 871 void quiesce_qp(struct rvt_qp *qp)
 872 {
 873         struct hfi1_qp_priv *priv = qp->priv;
 874
 875         iowait_sdma_drain(&priv->s_iowait);
 876         qp_pio_drain(qp);
 877         flush_tx_list(qp);
 878 }
 879
 880 void notify_qp_reset(struct rvt_qp *qp)
 881 {
 882         struct hfi1_qp_priv *priv = qp->priv;
 883
 884         priv->r_adefered = 0;
 885         clear_ahg(qp);
 886 }
 887
 888 /*
 889  * Switch to alternate path.
 890  * The QP s_lock should be held and interrupts disabled.
 891  */
 892 void hfi1_migrate_qp(struct rvt_qp *qp)
 893 {
 894         struct hfi1_qp_priv *priv = qp->priv;
 895         struct ib_event ev;
 896
 897         qp->s_mig_state = IB_MIG_MIGRATED;
 898         qp->remote_ah_attr = qp->alt_ah_attr;
 899         qp->port_num = qp->alt_ah_attr.port_num;
 900         qp->s_pkey_index = qp->s_alt_pkey_index;
 901         qp->s_flags |= RVT_S_AHG_CLEAR;
 902         priv->s_sc = ah_to_sc(qp->ibqp.device, &qp->remote_ah_attr);
 903         priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 904
 905         ev.device = qp->ibqp.device;
 906         ev.element.qp = &qp->ibqp;
 907         ev.event = IB_EVENT_PATH_MIG;
 908         qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 909 }
 910
 911 int mtu_to_path_mtu(u32 mtu)
 912 {
 913         return mtu_to_enum(mtu, OPA_MTU_8192);
 914 }
 915
 916 u32 mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
 917 {
 918         u32 mtu;
 919         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 920                                                     struct hfi1_ibdev,
 921                                                     rdi);
 922         struct hfi1_devdata *dd = container_of(verbs_dev,
 923                                                struct hfi1_devdata,
 924                                                verbs_dev);
 925         struct hfi1_ibport *ibp;
 926         u8 sc, vl;
 927
 928         ibp = &dd->pport[qp->port_num - 1].ibport_data;
 929         sc = ibp->sl_to_sc[qp->remote_ah_attr.sl];
 930         vl = sc_to_vlt(dd, sc);
 931
 932         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, pmtu);
 933         if (vl < PER_VL_SEND_CONTEXTS)
 934                 mtu = min_t(u32, mtu, dd->vld[vl].mtu);
 935         return mtu;
 936 }
 937
 938 int get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 939                        struct ib_qp_attr *attr)
 940 {
 941         int mtu, pidx = qp->port_num - 1;
 942         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 943                                                     struct hfi1_ibdev,
 944                                                     rdi);
 945         struct hfi1_devdata *dd = container_of(verbs_dev,
 946                                                struct hfi1_devdata,
 947                                                verbs_dev);
 948         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, attr->path_mtu);
 949         if (mtu == -1)
 950                 return -1; /* values less than 0 are error */
 951
 952         if (mtu > dd->pport[pidx].ibmtu)
 953                 return mtu_to_enum(dd->pport[pidx].ibmtu, IB_MTU_2048);
 954         else
 955                 return attr->path_mtu;
 956 }
 957
 958 void notify_error_qp(struct rvt_qp *qp)
 959 {
 960         struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
 961         struct hfi1_qp_priv *priv = qp->priv;
 962
 963         write_seqlock(&dev->iowait_lock);
 964         if (!list_empty(&priv->s_iowait.list) && !(qp->s_flags & RVT_S_BUSY)) {
 965                 qp->s_flags &= ~RVT_S_ANY_WAIT_IO;
 966                 list_del_init(&priv->s_iowait.list);
 967                 rvt_put_qp(qp);
 968         }
 969         write_sequnlock(&dev->iowait_lock);
 970
 971         if (!(qp->s_flags & RVT_S_BUSY)) {
 972                 qp->s_hdrwords = 0;
 973                 if (qp->s_rdma_mr) {
 974                         rvt_put_mr(qp->s_rdma_mr);
 975                         qp->s_rdma_mr = NULL;
 976                 }
 977                 flush_tx_list(qp);
 978         }
 979 }
 980
 981 /**
 982  * hfi1_error_port_qps - put a port's RC/UC qps into error state
 983  * @ibp: the ibport.
 984  * @sl: the service level.
 985  *
 986  * This function places all RC/UC qps with a given service level into error
 987  * state. It is generally called to force upper lay apps to abandon stale qps
 988  * after an sl->sc mapping change.
 989  */
 990 void hfi1_error_port_qps(struct hfi1_ibport *ibp, u8 sl)
 991 {
 992         struct rvt_qp *qp = NULL;
 993         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 994         struct hfi1_ibdev *dev = &ppd->dd->verbs_dev;
 995         int n;
 996         int lastwqe;
 997         struct ib_event ev;
 998
 999         rcu_read_lock();
1000
1001         /* Deal only with RC/UC qps that use the given SL. */
1002         for (n = 0; n < dev->rdi.qp_dev->qp_table_size; n++) {
1003                 for (qp = rcu_dereference(dev->rdi.qp_dev->qp_table[n]); qp;
1004                         qp = rcu_dereference(qp->next)) {
1005                         if (qp->port_num == ppd->port &&
1006                             (qp->ibqp.qp_type == IB_QPT_UC ||
1007                              qp->ibqp.qp_type == IB_QPT_RC) &&
1008                             qp->remote_ah_attr.sl == sl &&
1009                             (ib_rvt_state_ops[qp->state] &
1010                              RVT_POST_SEND_OK)) {
1011                                 spin_lock_irq(&qp->r_lock);
1012                                 spin_lock(&qp->s_hlock);
1013                                 spin_lock(&qp->s_lock);
1014                                 lastwqe = rvt_error_qp(qp,
1015                                                        IB_WC_WR_FLUSH_ERR);
1016                                 spin_unlock(&qp->s_lock);
1017                                 spin_unlock(&qp->s_hlock);
1018                                 spin_unlock_irq(&qp->r_lock);
1019                                 if (lastwqe) {
1020                                         ev.device = qp->ibqp.device;
1021                                         ev.element.qp = &qp->ibqp;
1022                                         ev.event =
1023                                                 IB_EVENT_QP_LAST_WQE_REACHED;
1024                                         qp->ibqp.event_handler(&ev,
1025                                                 qp->ibqp.qp_context);
1026                                 }
1027                         }
1028                 }
1029         }
1030
1031         rcu_read_unlock();
1032 }