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
  56 #include "hfi.h"
  57 #include "qp.h"
  58 #include "trace.h"
  59 #include "verbs_txreq.h"
  60
  61 unsigned int hfi1_qp_table_size = 256;
  62 module_param_named(qp_table_size, hfi1_qp_table_size, uint, S_IRUGO);
  63 MODULE_PARM_DESC(qp_table_size, "QP table size");
  64
  65 static void flush_tx_list(struct rvt_qp *qp);
  66 static int iowait_sleep(
  67         struct sdma_engine *sde,
  68         struct iowait *wait,
  69         struct sdma_txreq *stx,
  70         unsigned seq);
  71 static void iowait_wakeup(struct iowait *wait, int reason);
  72 static void iowait_sdma_drained(struct iowait *wait);
  73 static void qp_pio_drain(struct rvt_qp *qp);
  74
  75 static inline unsigned mk_qpn(struct rvt_qpn_table *qpt,
  76                               struct rvt_qpn_map *map, unsigned off)
  77 {
  78         return (map - qpt->map) * RVT_BITS_PER_PAGE + off;
  79 }
  80
  81 /*
  82  * Convert the AETH credit code into the number of credits.
  83  */
  84 static const u16 credit_table[31] = {
  85         0,                      /* 0 */
  86         1,                      /* 1 */
  87         2,                      /* 2 */
  88         3,                      /* 3 */
  89         4,                      /* 4 */
  90         6,                      /* 5 */
  91         8,                      /* 6 */
  92         12,                     /* 7 */
  93         16,                     /* 8 */
  94         24,                     /* 9 */
  95         32,                     /* A */
  96         48,                     /* B */
  97         64,                     /* C */
  98         96,                     /* D */
  99         128,                    /* E */
 100         192,                    /* F */
 101         256,                    /* 10 */
 102         384,                    /* 11 */
 103         512,                    /* 12 */
 104         768,                    /* 13 */
 105         1024,                   /* 14 */
 106         1536,                   /* 15 */
 107         2048,                   /* 16 */
 108         3072,                   /* 17 */
 109         4096,                   /* 18 */
 110         6144,                   /* 19 */
 111         8192,                   /* 1A */
 112         12288,                  /* 1B */
 113         16384,                  /* 1C */
 114         24576,                  /* 1D */
 115         32768                   /* 1E */
 116 };
 117
 118 static void flush_tx_list(struct rvt_qp *qp)
 119 {
 120         struct hfi1_qp_priv *priv = qp->priv;
 121
 122         while (!list_empty(&priv->s_iowait.tx_head)) {
 123                 struct sdma_txreq *tx;
 124
 125                 tx = list_first_entry(
 126                         &priv->s_iowait.tx_head,
 127                         struct sdma_txreq,
 128                         list);
 129                 list_del_init(&tx->list);
 130                 hfi1_put_txreq(
 131                         container_of(tx, struct verbs_txreq, txreq));
 132         }
 133 }
 134
 135 static void flush_iowait(struct rvt_qp *qp)
 136 {
 137         struct hfi1_qp_priv *priv = qp->priv;
 138         struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
 139         unsigned long flags;
 140
 141         write_seqlock_irqsave(&dev->iowait_lock, flags);
 142         if (!list_empty(&priv->s_iowait.list)) {
 143                 list_del_init(&priv->s_iowait.list);
 144                 if (atomic_dec_and_test(&qp->refcount))
 145                         wake_up(&qp->wait);
 146         }
 147         write_sequnlock_irqrestore(&dev->iowait_lock, flags);
 148 }
 149
 150 static inline int opa_mtu_enum_to_int(int mtu)
 151 {
 152         switch (mtu) {
 153         case OPA_MTU_8192:  return 8192;
 154         case OPA_MTU_10240: return 10240;
 155         default:            return -1;
 156         }
 157 }
 158
 159 /**
 160  * This function is what we would push to the core layer if we wanted to be a
 161  * "first class citizen".  Instead we hide this here and rely on Verbs ULPs
 162  * to blindly pass the MTU enum value from the PathRecord to us.
 163  */
 164 static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
 165 {
 166         int val;
 167
 168         /* Constraining 10KB packets to 8KB packets */
 169         if (mtu == (enum ib_mtu)OPA_MTU_10240)
 170                 mtu = OPA_MTU_8192;
 171         val = opa_mtu_enum_to_int((int)mtu);
 172         if (val > 0)
 173                 return val;
 174         return ib_mtu_enum_to_int(mtu);
 175 }
 176
 177 int hfi1_check_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 178                          int attr_mask, struct ib_udata *udata)
 179 {
 180         struct ib_qp *ibqp = &qp->ibqp;
 181         struct hfi1_ibdev *dev = to_idev(ibqp->device);
 182         struct hfi1_devdata *dd = dd_from_dev(dev);
 183         u8 sc;
 184
 185         if (attr_mask & IB_QP_AV) {
 186                 sc = ah_to_sc(ibqp->device, &attr->ah_attr);
 187                 if (sc == 0xf)
 188                         return -EINVAL;
 189
 190                 if (!qp_to_sdma_engine(qp, sc) &&
 191                     dd->flags & HFI1_HAS_SEND_DMA)
 192                         return -EINVAL;
 193
 194                 if (!qp_to_send_context(qp, sc))
 195                         return -EINVAL;
 196         }
 197
 198         if (attr_mask & IB_QP_ALT_PATH) {
 199                 sc = ah_to_sc(ibqp->device, &attr->alt_ah_attr);
 200                 if (sc == 0xf)
 201                         return -EINVAL;
 202
 203                 if (!qp_to_sdma_engine(qp, sc) &&
 204                     dd->flags & HFI1_HAS_SEND_DMA)
 205                         return -EINVAL;
 206
 207                 if (!qp_to_send_context(qp, sc))
 208                         return -EINVAL;
 209         }
 210
 211         return 0;
 212 }
 213
 214 void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 215                     int attr_mask, struct ib_udata *udata)
 216 {
 217         struct ib_qp *ibqp = &qp->ibqp;
 218         struct hfi1_qp_priv *priv = qp->priv;
 219
 220         if (attr_mask & IB_QP_AV) {
 221                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 222                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 223                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 224         }
 225
 226         if (attr_mask & IB_QP_PATH_MIG_STATE &&
 227             attr->path_mig_state == IB_MIG_MIGRATED &&
 228             qp->s_mig_state == IB_MIG_ARMED) {
 229                 qp->s_flags |= RVT_S_AHG_CLEAR;
 230                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 231                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 232                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 233         }
 234 }
 235
 236 /**
 237  * hfi1_check_send_wqe - validate wqe
 238  * @qp - The qp
 239  * @wqe - The built wqe
 240  *
 241  * validate wqe.  This is called
 242  * prior to inserting the wqe into
 243  * the ring but after the wqe has been
 244  * setup.
 245  *
 246  * Returns 0 on success, -EINVAL on failure
 247  *
 248  */
 249 int hfi1_check_send_wqe(struct rvt_qp *qp,
 250                         struct rvt_swqe *wqe)
 251 {
 252         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 253         struct rvt_ah *ah;
 254
 255         switch (qp->ibqp.qp_type) {
 256         case IB_QPT_RC:
 257         case IB_QPT_UC:
 258                 if (wqe->length > 0x80000000U)
 259                         return -EINVAL;
 260                 break;
 261         case IB_QPT_SMI:
 262                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 263                 if (wqe->length > (1 << ah->log_pmtu))
 264                         return -EINVAL;
 265                 break;
 266         case IB_QPT_GSI:
 267         case IB_QPT_UD:
 268                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 269                 if (wqe->length > (1 << ah->log_pmtu))
 270                         return -EINVAL;
 271                 if (ibp->sl_to_sc[ah->attr.sl] == 0xf)
 272                         return -EINVAL;
 273         default:
 274                 break;
 275         }
 276         return wqe->length <= piothreshold;
 277 }
 278
 279 /**
 280  * hfi1_compute_aeth - compute the AETH (syndrome + MSN)
 281  * @qp: the queue pair to compute the AETH for
 282  *
 283  * Returns the AETH.
 284  */
 285 __be32 hfi1_compute_aeth(struct rvt_qp *qp)
 286 {
 287         u32 aeth = qp->r_msn & HFI1_MSN_MASK;
 288
 289         if (qp->ibqp.srq) {
 290                 /*
 291                  * Shared receive queues don't generate credits.
 292                  * Set the credit field to the invalid value.
 293                  */
 294                 aeth |= HFI1_AETH_CREDIT_INVAL << HFI1_AETH_CREDIT_SHIFT;
 295         } else {
 296                 u32 min, max, x;
 297                 u32 credits;
 298                 struct rvt_rwq *wq = qp->r_rq.wq;
 299                 u32 head;
 300                 u32 tail;
 301
 302                 /* sanity check pointers before trusting them */
 303                 head = wq->head;
 304                 if (head >= qp->r_rq.size)
 305                         head = 0;
 306                 tail = wq->tail;
 307                 if (tail >= qp->r_rq.size)
 308                         tail = 0;
 309                 /*
 310                  * Compute the number of credits available (RWQEs).
 311                  * There is a small chance that the pair of reads are
 312                  * not atomic, which is OK, since the fuzziness is
 313                  * resolved as further ACKs go out.
 314                  */
 315                 credits = head - tail;
 316                 if ((int)credits < 0)
 317                         credits += qp->r_rq.size;
 318                 /*
 319                  * Binary search the credit table to find the code to
 320                  * use.
 321                  */
 322                 min = 0;
 323                 max = 31;
 324                 for (;;) {
 325                         x = (min + max) / 2;
 326                         if (credit_table[x] == credits)
 327                                 break;
 328                         if (credit_table[x] > credits) {
 329                                 max = x;
 330                         } else {
 331                                 if (min == x)
 332                                         break;
 333                                 min = x;
 334                         }
 335                 }
 336                 aeth |= x << HFI1_AETH_CREDIT_SHIFT;
 337         }
 338         return cpu_to_be32(aeth);
 339 }
 340
 341 /**
 342  * _hfi1_schedule_send - schedule progress
 343  * @qp: the QP
 344  *
 345  * This schedules qp progress w/o regard to the s_flags.
 346  *
 347  * It is only used in the post send, which doesn't hold
 348  * the s_lock.
 349  */
 350 void _hfi1_schedule_send(struct rvt_qp *qp)
 351 {
 352         struct hfi1_qp_priv *priv = qp->priv;
 353         struct hfi1_ibport *ibp =
 354                 to_iport(qp->ibqp.device, qp->port_num);
 355         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 356         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 357
 358         iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
 359                         priv->s_sde ?
 360                         priv->s_sde->cpu :
 361                         cpumask_first(cpumask_of_node(dd->node)));
 362 }
 363
 364 static void qp_pio_drain(struct rvt_qp *qp)
 365 {
 366         struct hfi1_ibdev *dev;
 367         struct hfi1_qp_priv *priv = qp->priv;
 368
 369         if (!priv->s_sendcontext)
 370                 return;
 371         dev = to_idev(qp->ibqp.device);
 372         while (iowait_pio_pending(&priv->s_iowait)) {
 373                 write_seqlock_irq(&dev->iowait_lock);
 374                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 1);
 375                 write_sequnlock_irq(&dev->iowait_lock);
 376                 iowait_pio_drain(&priv->s_iowait);
 377                 write_seqlock_irq(&dev->iowait_lock);
 378                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 0);
 379                 write_sequnlock_irq(&dev->iowait_lock);
 380         }
 381 }
 382
 383 /**
 384  * hfi1_schedule_send - schedule progress
 385  * @qp: the QP
 386  *
 387  * This schedules qp progress and caller should hold
 388  * the s_lock.
 389  */
 390 void hfi1_schedule_send(struct rvt_qp *qp)
 391 {
 392         if (hfi1_send_ok(qp))
 393                 _hfi1_schedule_send(qp);
 394 }
 395
 396 /**
 397  * hfi1_get_credit - flush the send work queue of a QP
 398  * @qp: the qp who's send work queue to flush
 399  * @aeth: the Acknowledge Extended Transport Header
 400  *
 401  * The QP s_lock should be held.
 402  */
 403 void hfi1_get_credit(struct rvt_qp *qp, u32 aeth)
 404 {
 405         u32 credit = (aeth >> HFI1_AETH_CREDIT_SHIFT) & HFI1_AETH_CREDIT_MASK;
 406
 407         /*
 408          * If the credit is invalid, we can send
 409          * as many packets as we like.  Otherwise, we have to
 410          * honor the credit field.
 411          */
 412         if (credit == HFI1_AETH_CREDIT_INVAL) {
 413                 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) {
 414                         qp->s_flags |= RVT_S_UNLIMITED_CREDIT;
 415                         if (qp->s_flags & RVT_S_WAIT_SSN_CREDIT) {
 416                                 qp->s_flags &= ~RVT_S_WAIT_SSN_CREDIT;
 417                                 hfi1_schedule_send(qp);
 418                         }
 419                 }
 420         } else if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) {
 421                 /* Compute new LSN (i.e., MSN + credit) */
 422                 credit = (aeth + credit_table[credit]) & HFI1_MSN_MASK;
 423                 if (cmp_msn(credit, qp->s_lsn) > 0) {
 424                         qp->s_lsn = credit;
 425                         if (qp->s_flags & RVT_S_WAIT_SSN_CREDIT) {
 426                                 qp->s_flags &= ~RVT_S_WAIT_SSN_CREDIT;
 427                                 hfi1_schedule_send(qp);
 428                         }
 429                 }
 430         }
 431 }
 432
 433 void hfi1_qp_wakeup(struct rvt_qp *qp, u32 flag)
 434 {
 435         unsigned long flags;
 436
 437         spin_lock_irqsave(&qp->s_lock, flags);
 438         if (qp->s_flags & flag) {
 439                 qp->s_flags &= ~flag;
 440                 trace_hfi1_qpwakeup(qp, flag);
 441                 hfi1_schedule_send(qp);
 442         }
 443         spin_unlock_irqrestore(&qp->s_lock, flags);
 444         /* Notify hfi1_destroy_qp() if it is waiting. */
 445         if (atomic_dec_and_test(&qp->refcount))
 446                 wake_up(&qp->wait);
 447 }
 448
 449 static int iowait_sleep(
 450         struct sdma_engine *sde,
 451         struct iowait *wait,
 452         struct sdma_txreq *stx,
 453         unsigned seq)
 454 {
 455         struct verbs_txreq *tx = container_of(stx, struct verbs_txreq, txreq);
 456         struct rvt_qp *qp;
 457         struct hfi1_qp_priv *priv;
 458         unsigned long flags;
 459         int ret = 0;
 460         struct hfi1_ibdev *dev;
 461
 462         qp = tx->qp;
 463         priv = qp->priv;
 464
 465         spin_lock_irqsave(&qp->s_lock, flags);
 466         if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
 467                 /*
 468                  * If we couldn't queue the DMA request, save the info
 469                  * and try again later rather than destroying the
 470                  * buffer and undoing the side effects of the copy.
 471                  */
 472                 /* Make a common routine? */
 473                 dev = &sde->dd->verbs_dev;
 474                 list_add_tail(&stx->list, &wait->tx_head);
 475                 write_seqlock(&dev->iowait_lock);
 476                 if (sdma_progress(sde, seq, stx))
 477                         goto eagain;
 478                 if (list_empty(&priv->s_iowait.list)) {
 479                         struct hfi1_ibport *ibp =
 480                                 to_iport(qp->ibqp.device, qp->port_num);
 481
 482                         ibp->rvp.n_dmawait++;
 483                         qp->s_flags |= RVT_S_WAIT_DMA_DESC;
 484                         list_add_tail(&priv->s_iowait.list, &sde->dmawait);
 485                         trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
 486                         atomic_inc(&qp->refcount);
 487                 }
 488                 write_sequnlock(&dev->iowait_lock);
 489                 qp->s_flags &= ~RVT_S_BUSY;
 490                 spin_unlock_irqrestore(&qp->s_lock, flags);
 491                 ret = -EBUSY;
 492         } else {
 493                 spin_unlock_irqrestore(&qp->s_lock, flags);
 494                 hfi1_put_txreq(tx);
 495         }
 496         return ret;
 497 eagain:
 498         write_sequnlock(&dev->iowait_lock);
 499         spin_unlock_irqrestore(&qp->s_lock, flags);
 500         list_del_init(&stx->list);
 501         return -EAGAIN;
 502 }
 503
 504 static void iowait_wakeup(struct iowait *wait, int reason)
 505 {
 506         struct rvt_qp *qp = iowait_to_qp(wait);
 507
 508         WARN_ON(reason != SDMA_AVAIL_REASON);
 509         hfi1_qp_wakeup(qp, RVT_S_WAIT_DMA_DESC);
 510 }
 511
 512 static void iowait_sdma_drained(struct iowait *wait)
 513 {
 514         struct rvt_qp *qp = iowait_to_qp(wait);
 515         unsigned long flags;
 516
 517         /*
 518          * This happens when the send engine notes
 519          * a QP in the error state and cannot
 520          * do the flush work until that QP's
 521          * sdma work has finished.
 522          */
 523         spin_lock_irqsave(&qp->s_lock, flags);
 524         if (qp->s_flags & RVT_S_WAIT_DMA) {
 525                 qp->s_flags &= ~RVT_S_WAIT_DMA;
 526                 hfi1_schedule_send(qp);
 527         }
 528         spin_unlock_irqrestore(&qp->s_lock, flags);
 529 }
 530
 531 /**
 532  *
 533  * qp_to_sdma_engine - map a qp to a send engine
 534  * @qp: the QP
 535  * @sc5: the 5 bit sc
 536  *
 537  * Return:
 538  * A send engine for the qp or NULL for SMI type qp.
 539  */
 540 struct sdma_engine *qp_to_sdma_engine(struct rvt_qp *qp, u8 sc5)
 541 {
 542         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 543         struct sdma_engine *sde;
 544
 545         if (!(dd->flags & HFI1_HAS_SEND_DMA))
 546                 return NULL;
 547         switch (qp->ibqp.qp_type) {
 548         case IB_QPT_SMI:
 549                 return NULL;
 550         default:
 551                 break;
 552         }
 553         sde = sdma_select_engine_sc(dd, qp->ibqp.qp_num >> dd->qos_shift, sc5);
 554         return sde;
 555 }
 556
 557 /*
 558  * qp_to_send_context - map a qp to a send context
 559  * @qp: the QP
 560  * @sc5: the 5 bit sc
 561  *
 562  * Return:
 563  * A send context for the qp
 564  */
 565 struct send_context *qp_to_send_context(struct rvt_qp *qp, u8 sc5)
 566 {
 567         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 568
 569         switch (qp->ibqp.qp_type) {
 570         case IB_QPT_SMI:
 571                 /* SMA packets to VL15 */
 572                 return dd->vld[15].sc;
 573         default:
 574                 break;
 575         }
 576
 577         return pio_select_send_context_sc(dd, qp->ibqp.qp_num >> dd->qos_shift,
 578                                           sc5);
 579 }
 580
 581 struct qp_iter {
 582         struct hfi1_ibdev *dev;
 583         struct rvt_qp *qp;
 584         int specials;
 585         int n;
 586 };
 587
 588 struct qp_iter *qp_iter_init(struct hfi1_ibdev *dev)
 589 {
 590         struct qp_iter *iter;
 591
 592         iter = kzalloc(sizeof(*iter), GFP_KERNEL);
 593         if (!iter)
 594                 return NULL;
 595
 596         iter->dev = dev;
 597         iter->specials = dev->rdi.ibdev.phys_port_cnt * 2;
 598         if (qp_iter_next(iter)) {
 599                 kfree(iter);
 600                 return NULL;
 601         }
 602
 603         return iter;
 604 }
 605
 606 int qp_iter_next(struct qp_iter *iter)
 607 {
 608         struct hfi1_ibdev *dev = iter->dev;
 609         int n = iter->n;
 610         int ret = 1;
 611         struct rvt_qp *pqp = iter->qp;
 612         struct rvt_qp *qp;
 613
 614         /*
 615          * The approach is to consider the special qps
 616          * as an additional table entries before the
 617          * real hash table.  Since the qp code sets
 618          * the qp->next hash link to NULL, this works just fine.
 619          *
 620          * iter->specials is 2 * # ports
 621          *
 622          * n = 0..iter->specials is the special qp indices
 623          *
 624          * n = iter->specials..dev->rdi.qp_dev->qp_table_size+iter->specials are
 625          * the potential hash bucket entries
 626          *
 627          */
 628         for (; n <  dev->rdi.qp_dev->qp_table_size + iter->specials; n++) {
 629                 if (pqp) {
 630                         qp = rcu_dereference(pqp->next);
 631                 } else {
 632                         if (n < iter->specials) {
 633                                 struct hfi1_pportdata *ppd;
 634                                 struct hfi1_ibport *ibp;
 635                                 int pidx;
 636
 637                                 pidx = n % dev->rdi.ibdev.phys_port_cnt;
 638                                 ppd = &dd_from_dev(dev)->pport[pidx];
 639                                 ibp = &ppd->ibport_data;
 640
 641                                 if (!(n & 1))
 642                                         qp = rcu_dereference(ibp->rvp.qp[0]);
 643                                 else
 644                                         qp = rcu_dereference(ibp->rvp.qp[1]);
 645                         } else {
 646                                 qp = rcu_dereference(
 647                                         dev->rdi.qp_dev->qp_table[
 648                                                 (n - iter->specials)]);
 649                         }
 650                 }
 651                 pqp = qp;
 652                 if (qp) {
 653                         iter->qp = qp;
 654                         iter->n = n;
 655                         return 0;
 656                 }
 657         }
 658         return ret;
 659 }
 660
 661 static const char * const qp_type_str[] = {
 662         "SMI", "GSI", "RC", "UC", "UD",
 663 };
 664
 665 static int qp_idle(struct rvt_qp *qp)
 666 {
 667         return
 668                 qp->s_last == qp->s_acked &&
 669                 qp->s_acked == qp->s_cur &&
 670                 qp->s_cur == qp->s_tail &&
 671                 qp->s_tail == qp->s_head;
 672 }
 673
 674 void qp_iter_print(struct seq_file *s, struct qp_iter *iter)
 675 {
 676         struct rvt_swqe *wqe;
 677         struct rvt_qp *qp = iter->qp;
 678         struct hfi1_qp_priv *priv = qp->priv;
 679         struct sdma_engine *sde;
 680         struct send_context *send_context;
 681
 682         sde = qp_to_sdma_engine(qp, priv->s_sc);
 683         wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 684         send_context = qp_to_send_context(qp, priv->s_sc);
 685         seq_printf(s,
 686                    "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",
 687                    iter->n,
 688                    qp_idle(qp) ? "I" : "B",
 689                    qp->ibqp.qp_num,
 690                    atomic_read(&qp->refcount),
 691                    qp_type_str[qp->ibqp.qp_type],
 692                    qp->state,
 693                    wqe ? wqe->wr.opcode : 0,
 694                    qp->s_hdrwords,
 695                    qp->s_flags,
 696                    iowait_sdma_pending(&priv->s_iowait),
 697                    iowait_pio_pending(&priv->s_iowait),
 698                    !list_empty(&priv->s_iowait.list),
 699                    qp->timeout,
 700                    wqe ? wqe->ssn : 0,
 701                    qp->s_lsn,
 702                    qp->s_last_psn,
 703                    qp->s_psn, qp->s_next_psn,
 704                    qp->s_sending_psn, qp->s_sending_hpsn,
 705                    qp->s_last, qp->s_acked, qp->s_cur,
 706                    qp->s_tail, qp->s_head, qp->s_size,
 707                    qp->s_avail,
 708                    qp->remote_qpn,
 709                    qp->remote_ah_attr.dlid,
 710                    qp->remote_ah_attr.sl,
 711                    qp->pmtu,
 712                    qp->s_retry,
 713                    qp->s_retry_cnt,
 714                    qp->s_rnr_retry_cnt,
 715                    sde,
 716                    sde ? sde->this_idx : 0,
 717                    send_context,
 718                    send_context ? send_context->sw_index : 0,
 719                    ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->head,
 720                    ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->tail,
 721                    qp->pid);
 722 }
 723
 724 void qp_comm_est(struct rvt_qp *qp)
 725 {
 726         qp->r_flags |= RVT_R_COMM_EST;
 727         if (qp->ibqp.event_handler) {
 728                 struct ib_event ev;
 729
 730                 ev.device = qp->ibqp.device;
 731                 ev.element.qp = &qp->ibqp;
 732                 ev.event = IB_EVENT_COMM_EST;
 733                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 734         }
 735 }
 736
 737 void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 738                     gfp_t gfp)
 739 {
 740         struct hfi1_qp_priv *priv;
 741
 742         priv = kzalloc_node(sizeof(*priv), gfp, rdi->dparms.node);
 743         if (!priv)
 744                 return ERR_PTR(-ENOMEM);
 745
 746         priv->owner = qp;
 747
 748         priv->s_hdr = kzalloc_node(sizeof(*priv->s_hdr), gfp, rdi->dparms.node);
 749         if (!priv->s_hdr) {
 750                 kfree(priv);
 751                 return ERR_PTR(-ENOMEM);
 752         }
 753         setup_timer(&priv->s_rnr_timer, hfi1_rc_rnr_retry, (unsigned long)qp);
 754         qp->s_timer.function = hfi1_rc_timeout;
 755         return priv;
 756 }
 757
 758 void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 759 {
 760         struct hfi1_qp_priv *priv = qp->priv;
 761
 762         kfree(priv->s_hdr);
 763         kfree(priv);
 764 }
 765
 766 unsigned free_all_qps(struct rvt_dev_info *rdi)
 767 {
 768         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 769                                                     struct hfi1_ibdev,
 770                                                     rdi);
 771         struct hfi1_devdata *dd = container_of(verbs_dev,
 772                                                struct hfi1_devdata,
 773                                                verbs_dev);
 774         int n;
 775         unsigned qp_inuse = 0;
 776
 777         for (n = 0; n < dd->num_pports; n++) {
 778                 struct hfi1_ibport *ibp = &dd->pport[n].ibport_data;
 779
 780                 rcu_read_lock();
 781                 if (rcu_dereference(ibp->rvp.qp[0]))
 782                         qp_inuse++;
 783                 if (rcu_dereference(ibp->rvp.qp[1]))
 784                         qp_inuse++;
 785                 rcu_read_unlock();
 786         }
 787
 788         return qp_inuse;
 789 }
 790
 791 void flush_qp_waiters(struct rvt_qp *qp)
 792 {
 793         flush_iowait(qp);
 794         hfi1_stop_rc_timers(qp);
 795 }
 796
 797 void stop_send_queue(struct rvt_qp *qp)
 798 {
 799         struct hfi1_qp_priv *priv = qp->priv;
 800
 801         cancel_work_sync(&priv->s_iowait.iowork);
 802         hfi1_del_timers_sync(qp);
 803 }
 804
 805 void quiesce_qp(struct rvt_qp *qp)
 806 {
 807         struct hfi1_qp_priv *priv = qp->priv;
 808
 809         iowait_sdma_drain(&priv->s_iowait);
 810         qp_pio_drain(qp);
 811         flush_tx_list(qp);
 812 }
 813
 814 void notify_qp_reset(struct rvt_qp *qp)
 815 {
 816         struct hfi1_qp_priv *priv = qp->priv;
 817
 818         iowait_init(
 819                 &priv->s_iowait,
 820                 1,
 821                 _hfi1_do_send,
 822                 iowait_sleep,
 823                 iowait_wakeup,
 824                 iowait_sdma_drained);
 825         priv->r_adefered = 0;
 826         clear_ahg(qp);
 827 }
 828
 829 /*
 830  * Switch to alternate path.
 831  * The QP s_lock should be held and interrupts disabled.
 832  */
 833 void hfi1_migrate_qp(struct rvt_qp *qp)
 834 {
 835         struct hfi1_qp_priv *priv = qp->priv;
 836         struct ib_event ev;
 837
 838         qp->s_mig_state = IB_MIG_MIGRATED;
 839         qp->remote_ah_attr = qp->alt_ah_attr;
 840         qp->port_num = qp->alt_ah_attr.port_num;
 841         qp->s_pkey_index = qp->s_alt_pkey_index;
 842         qp->s_flags |= RVT_S_AHG_CLEAR;
 843         priv->s_sc = ah_to_sc(qp->ibqp.device, &qp->remote_ah_attr);
 844         priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 845
 846         ev.device = qp->ibqp.device;
 847         ev.element.qp = &qp->ibqp;
 848         ev.event = IB_EVENT_PATH_MIG;
 849         qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 850 }
 851
 852 int mtu_to_path_mtu(u32 mtu)
 853 {
 854         return mtu_to_enum(mtu, OPA_MTU_8192);
 855 }
 856
 857 u32 mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
 858 {
 859         u32 mtu;
 860         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 861                                                     struct hfi1_ibdev,
 862                                                     rdi);
 863         struct hfi1_devdata *dd = container_of(verbs_dev,
 864                                                struct hfi1_devdata,
 865                                                verbs_dev);
 866         struct hfi1_ibport *ibp;
 867         u8 sc, vl;
 868
 869         ibp = &dd->pport[qp->port_num - 1].ibport_data;
 870         sc = ibp->sl_to_sc[qp->remote_ah_attr.sl];
 871         vl = sc_to_vlt(dd, sc);
 872
 873         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, pmtu);
 874         if (vl < PER_VL_SEND_CONTEXTS)
 875                 mtu = min_t(u32, mtu, dd->vld[vl].mtu);
 876         return mtu;
 877 }
 878
 879 int get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 880                        struct ib_qp_attr *attr)
 881 {
 882         int mtu, pidx = qp->port_num - 1;
 883         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 884                                                     struct hfi1_ibdev,
 885                                                     rdi);
 886         struct hfi1_devdata *dd = container_of(verbs_dev,
 887                                                struct hfi1_devdata,
 888                                                verbs_dev);
 889         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, attr->path_mtu);
 890         if (mtu == -1)
 891                 return -1; /* values less than 0 are error */
 892
 893         if (mtu > dd->pport[pidx].ibmtu)
 894                 return mtu_to_enum(dd->pport[pidx].ibmtu, IB_MTU_2048);
 895         else
 896                 return attr->path_mtu;
 897 }
 898
 899 void notify_error_qp(struct rvt_qp *qp)
 900 {
 901         struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
 902         struct hfi1_qp_priv *priv = qp->priv;
 903
 904         write_seqlock(&dev->iowait_lock);
 905         if (!list_empty(&priv->s_iowait.list) && !(qp->s_flags & RVT_S_BUSY)) {
 906                 qp->s_flags &= ~RVT_S_ANY_WAIT_IO;
 907                 list_del_init(&priv->s_iowait.list);
 908                 if (atomic_dec_and_test(&qp->refcount))
 909                         wake_up(&qp->wait);
 910         }
 911         write_sequnlock(&dev->iowait_lock);
 912
 913         if (!(qp->s_flags & RVT_S_BUSY)) {
 914                 qp->s_hdrwords = 0;
 915                 if (qp->s_rdma_mr) {
 916                         rvt_put_mr(qp->s_rdma_mr);
 917                         qp->s_rdma_mr = NULL;
 918                 }
 919                 flush_tx_list(qp);
 920         }
 921 }
 922
 923 /**
 924  * hfi1_error_port_qps - put a port's RC/UC qps into error state
 925  * @ibp: the ibport.
 926  * @sl: the service level.
 927  *
 928  * This function places all RC/UC qps with a given service level into error
 929  * state. It is generally called to force upper lay apps to abandon stale qps
 930  * after an sl->sc mapping change.
 931  */
 932 void hfi1_error_port_qps(struct hfi1_ibport *ibp, u8 sl)
 933 {
 934         struct rvt_qp *qp = NULL;
 935         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 936         struct hfi1_ibdev *dev = &ppd->dd->verbs_dev;
 937         int n;
 938         int lastwqe;
 939         struct ib_event ev;
 940
 941         rcu_read_lock();
 942
 943         /* Deal only with RC/UC qps that use the given SL. */
 944         for (n = 0; n < dev->rdi.qp_dev->qp_table_size; n++) {
 945                 for (qp = rcu_dereference(dev->rdi.qp_dev->qp_table[n]); qp;
 946                         qp = rcu_dereference(qp->next)) {
 947                         if (qp->port_num == ppd->port &&
 948                             (qp->ibqp.qp_type == IB_QPT_UC ||
 949                              qp->ibqp.qp_type == IB_QPT_RC) &&
 950                             qp->remote_ah_attr.sl == sl &&
 951                             (ib_rvt_state_ops[qp->state] &
 952                              RVT_POST_SEND_OK)) {
 953                                 spin_lock_irq(&qp->r_lock);
 954                                 spin_lock(&qp->s_hlock);
 955                                 spin_lock(&qp->s_lock);
 956                                 lastwqe = rvt_error_qp(qp,
 957                                                        IB_WC_WR_FLUSH_ERR);
 958                                 spin_unlock(&qp->s_lock);
 959                                 spin_unlock(&qp->s_hlock);
 960                                 spin_unlock_irq(&qp->r_lock);
 961                                 if (lastwqe) {
 962                                         ev.device = qp->ibqp.device;
 963                                         ev.element.qp = &qp->ibqp;
 964                                         ev.event =
 965                                                 IB_EVENT_QP_LAST_WQE_REACHED;
 966                                         qp->ibqp.event_handler(&ev,
 967                                                 qp->ibqp.qp_context);
 968                                 }
 969                         }
 970                 }
 971         }
 972
 973         rcu_read_unlock();
 974 }