drivers/infiniband/hw/hfi1/qp.c

   1 /*
   2  * Copyright(c) 2015 - 2019 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_work *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 [IB_WR_OPFN] = {
 136         .length = sizeof(struct ib_atomic_wr),
 137         .qpt_support = BIT(IB_QPT_RC),
 138         .flags = RVT_OPERATION_USE_RESERVE,
 139 },
 140
 141 [IB_WR_TID_RDMA_WRITE] = {
 142         .length = sizeof(struct ib_rdma_wr),
 143         .qpt_support = BIT(IB_QPT_RC),
 144         .flags = RVT_OPERATION_IGN_RNR_CNT,
 145 },
 146
 147 };
 148
 149 static void flush_list_head(struct list_head *l)
 150 {
 151         while (!list_empty(l)) {
 152                 struct sdma_txreq *tx;
 153
 154                 tx = list_first_entry(
 155                         l,
 156                         struct sdma_txreq,
 157                         list);
 158                 list_del_init(&tx->list);
 159                 hfi1_put_txreq(
 160                         container_of(tx, struct verbs_txreq, txreq));
 161         }
 162 }
 163
 164 static void flush_tx_list(struct rvt_qp *qp)
 165 {
 166         struct hfi1_qp_priv *priv = qp->priv;
 167
 168         flush_list_head(&iowait_get_ib_work(&priv->s_iowait)->tx_head);
 169         flush_list_head(&iowait_get_tid_work(&priv->s_iowait)->tx_head);
 170 }
 171
 172 static void flush_iowait(struct rvt_qp *qp)
 173 {
 174         struct hfi1_qp_priv *priv = qp->priv;
 175         unsigned long flags;
 176         seqlock_t *lock = priv->s_iowait.lock;
 177
 178         if (!lock)
 179                 return;
 180         write_seqlock_irqsave(lock, flags);
 181         if (!list_empty(&priv->s_iowait.list)) {
 182                 list_del_init(&priv->s_iowait.list);
 183                 priv->s_iowait.lock = NULL;
 184                 rvt_put_qp(qp);
 185         }
 186         write_sequnlock_irqrestore(lock, flags);
 187 }
 188
 189 static inline int opa_mtu_enum_to_int(int mtu)
 190 {
 191         switch (mtu) {
 192         case OPA_MTU_8192:  return 8192;
 193         case OPA_MTU_10240: return 10240;
 194         default:            return -1;
 195         }
 196 }
 197
 198 /**
 199  * This function is what we would push to the core layer if we wanted to be a
 200  * "first class citizen".  Instead we hide this here and rely on Verbs ULPs
 201  * to blindly pass the MTU enum value from the PathRecord to us.
 202  */
 203 static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
 204 {
 205         int val;
 206
 207         /* Constraining 10KB packets to 8KB packets */
 208         if (mtu == (enum ib_mtu)OPA_MTU_10240)
 209                 mtu = OPA_MTU_8192;
 210         val = opa_mtu_enum_to_int((int)mtu);
 211         if (val > 0)
 212                 return val;
 213         return ib_mtu_enum_to_int(mtu);
 214 }
 215
 216 int hfi1_check_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 217                          int attr_mask, struct ib_udata *udata)
 218 {
 219         struct ib_qp *ibqp = &qp->ibqp;
 220         struct hfi1_ibdev *dev = to_idev(ibqp->device);
 221         struct hfi1_devdata *dd = dd_from_dev(dev);
 222         u8 sc;
 223
 224         if (attr_mask & IB_QP_AV) {
 225                 sc = ah_to_sc(ibqp->device, &attr->ah_attr);
 226                 if (sc == 0xf)
 227                         return -EINVAL;
 228
 229                 if (!qp_to_sdma_engine(qp, sc) &&
 230                     dd->flags & HFI1_HAS_SEND_DMA)
 231                         return -EINVAL;
 232
 233                 if (!qp_to_send_context(qp, sc))
 234                         return -EINVAL;
 235         }
 236
 237         if (attr_mask & IB_QP_ALT_PATH) {
 238                 sc = ah_to_sc(ibqp->device, &attr->alt_ah_attr);
 239                 if (sc == 0xf)
 240                         return -EINVAL;
 241
 242                 if (!qp_to_sdma_engine(qp, sc) &&
 243                     dd->flags & HFI1_HAS_SEND_DMA)
 244                         return -EINVAL;
 245
 246                 if (!qp_to_send_context(qp, sc))
 247                         return -EINVAL;
 248         }
 249
 250         return 0;
 251 }
 252
 253 /*
 254  * qp_set_16b - Set the hdr_type based on whether the slid or the
 255  * dlid in the connection is extended. Only applicable for RC and UC
 256  * QPs. UD QPs determine this on the fly from the ah in the wqe
 257  */
 258 static inline void qp_set_16b(struct rvt_qp *qp)
 259 {
 260         struct hfi1_pportdata *ppd;
 261         struct hfi1_ibport *ibp;
 262         struct hfi1_qp_priv *priv = qp->priv;
 263
 264         /* Update ah_attr to account for extended LIDs */
 265         hfi1_update_ah_attr(qp->ibqp.device, &qp->remote_ah_attr);
 266
 267         /* Create 32 bit LIDs */
 268         hfi1_make_opa_lid(&qp->remote_ah_attr);
 269
 270         if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH))
 271                 return;
 272
 273         ibp = to_iport(qp->ibqp.device, qp->port_num);
 274         ppd = ppd_from_ibp(ibp);
 275         priv->hdr_type = hfi1_get_hdr_type(ppd->lid, &qp->remote_ah_attr);
 276 }
 277
 278 void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 279                     int attr_mask, struct ib_udata *udata)
 280 {
 281         struct ib_qp *ibqp = &qp->ibqp;
 282         struct hfi1_qp_priv *priv = qp->priv;
 283
 284         if (attr_mask & IB_QP_AV) {
 285                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 286                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 287                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 288                 qp_set_16b(qp);
 289         }
 290
 291         if (attr_mask & IB_QP_PATH_MIG_STATE &&
 292             attr->path_mig_state == IB_MIG_MIGRATED &&
 293             qp->s_mig_state == IB_MIG_ARMED) {
 294                 qp->s_flags |= HFI1_S_AHG_CLEAR;
 295                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 296                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 297                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 298                 qp_set_16b(qp);
 299         }
 300
 301         opfn_qp_init(qp, attr, attr_mask);
 302 }
 303
 304 /**
 305  * hfi1_setup_wqe - set up the wqe
 306  * @qp - The qp
 307  * @wqe - The built wqe
 308  * @call_send - Determine if the send should be posted or scheduled.
 309  *
 310  * Perform setup of the wqe.  This is called
 311  * prior to inserting the wqe into the ring but after
 312  * the wqe has been setup by RDMAVT. This function
 313  * allows the driver the opportunity to perform
 314  * validation and additional setup of the wqe.
 315  *
 316  * Returns 0 on success, -EINVAL on failure
 317  *
 318  */
 319 int hfi1_setup_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe, bool *call_send)
 320 {
 321         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 322         struct rvt_ah *ah;
 323         struct hfi1_pportdata *ppd;
 324         struct hfi1_devdata *dd;
 325
 326         switch (qp->ibqp.qp_type) {
 327         case IB_QPT_RC:
 328                 hfi1_setup_tid_rdma_wqe(qp, wqe);
 329                 /* fall through */
 330         case IB_QPT_UC:
 331                 if (wqe->length > 0x80000000U)
 332                         return -EINVAL;
 333                 if (wqe->length > qp->pmtu)
 334                         *call_send = false;
 335                 break;
 336         case IB_QPT_SMI:
 337                 /*
 338                  * SM packets should exclusively use VL15 and their SL is
 339                  * ignored (IBTA v1.3, Section 3.5.8.2). Therefore, when ah
 340                  * is created, SL is 0 in most cases and as a result some
 341                  * fields (vl and pmtu) in ah may not be set correctly,
 342                  * depending on the SL2SC and SC2VL tables at the time.
 343                  */
 344                 ppd = ppd_from_ibp(ibp);
 345                 dd = dd_from_ppd(ppd);
 346                 if (wqe->length > dd->vld[15].mtu)
 347                         return -EINVAL;
 348                 break;
 349         case IB_QPT_GSI:
 350         case IB_QPT_UD:
 351                 ah = rvt_get_swqe_ah(wqe);
 352                 if (wqe->length > (1 << ah->log_pmtu))
 353                         return -EINVAL;
 354                 if (ibp->sl_to_sc[rdma_ah_get_sl(&ah->attr)] == 0xf)
 355                         return -EINVAL;
 356         default:
 357                 break;
 358         }
 359
 360         /*
 361          * System latency between send and schedule is large enough that
 362          * forcing call_send to true for piothreshold packets is necessary.
 363          */
 364         if (wqe->length <= piothreshold)
 365                 *call_send = true;
 366         return 0;
 367 }
 368
 369 /**
 370  * _hfi1_schedule_send - schedule progress
 371  * @qp: the QP
 372  *
 373  * This schedules qp progress w/o regard to the s_flags.
 374  *
 375  * It is only used in the post send, which doesn't hold
 376  * the s_lock.
 377  */
 378 bool _hfi1_schedule_send(struct rvt_qp *qp)
 379 {
 380         struct hfi1_qp_priv *priv = qp->priv;
 381         struct hfi1_ibport *ibp =
 382                 to_iport(qp->ibqp.device, qp->port_num);
 383         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 384         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 385
 386         return iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
 387                                priv->s_sde ?
 388                                priv->s_sde->cpu :
 389                                cpumask_first(cpumask_of_node(dd->node)));
 390 }
 391
 392 static void qp_pio_drain(struct rvt_qp *qp)
 393 {
 394         struct hfi1_qp_priv *priv = qp->priv;
 395
 396         if (!priv->s_sendcontext)
 397                 return;
 398         while (iowait_pio_pending(&priv->s_iowait)) {
 399                 write_seqlock_irq(&priv->s_sendcontext->waitlock);
 400                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 1);
 401                 write_sequnlock_irq(&priv->s_sendcontext->waitlock);
 402                 iowait_pio_drain(&priv->s_iowait);
 403                 write_seqlock_irq(&priv->s_sendcontext->waitlock);
 404                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 0);
 405                 write_sequnlock_irq(&priv->s_sendcontext->waitlock);
 406         }
 407 }
 408
 409 /**
 410  * hfi1_schedule_send - schedule progress
 411  * @qp: the QP
 412  *
 413  * This schedules qp progress and caller should hold
 414  * the s_lock.
 415  * @return true if the first leg is scheduled;
 416  * false if the first leg is not scheduled.
 417  */
 418 bool hfi1_schedule_send(struct rvt_qp *qp)
 419 {
 420         lockdep_assert_held(&qp->s_lock);
 421         if (hfi1_send_ok(qp)) {
 422                 _hfi1_schedule_send(qp);
 423                 return true;
 424         }
 425         if (qp->s_flags & HFI1_S_ANY_WAIT_IO)
 426                 iowait_set_flag(&((struct hfi1_qp_priv *)qp->priv)->s_iowait,
 427                                 IOWAIT_PENDING_IB);
 428         return false;
 429 }
 430
 431 static void hfi1_qp_schedule(struct rvt_qp *qp)
 432 {
 433         struct hfi1_qp_priv *priv = qp->priv;
 434         bool ret;
 435
 436         if (iowait_flag_set(&priv->s_iowait, IOWAIT_PENDING_IB)) {
 437                 ret = hfi1_schedule_send(qp);
 438                 if (ret)
 439                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_IB);
 440         }
 441         if (iowait_flag_set(&priv->s_iowait, IOWAIT_PENDING_TID)) {
 442                 ret = hfi1_schedule_tid_send(qp);
 443                 if (ret)
 444                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
 445         }
 446 }
 447
 448 void hfi1_qp_wakeup(struct rvt_qp *qp, u32 flag)
 449 {
 450         unsigned long flags;
 451
 452         spin_lock_irqsave(&qp->s_lock, flags);
 453         if (qp->s_flags & flag) {
 454                 qp->s_flags &= ~flag;
 455                 trace_hfi1_qpwakeup(qp, flag);
 456                 hfi1_qp_schedule(qp);
 457         }
 458         spin_unlock_irqrestore(&qp->s_lock, flags);
 459         /* Notify hfi1_destroy_qp() if it is waiting. */
 460         rvt_put_qp(qp);
 461 }
 462
 463 void hfi1_qp_unbusy(struct rvt_qp *qp, struct iowait_work *wait)
 464 {
 465         struct hfi1_qp_priv *priv = qp->priv;
 466
 467         if (iowait_set_work_flag(wait) == IOWAIT_IB_SE) {
 468                 qp->s_flags &= ~RVT_S_BUSY;
 469                 /*
 470                  * If we are sending a first-leg packet from the second leg,
 471                  * we need to clear the busy flag from priv->s_flags to
 472                  * avoid a race condition when the qp wakes up before
 473                  * the call to hfi1_verbs_send() returns to the second
 474                  * leg. In that case, the second leg will terminate without
 475                  * being re-scheduled, resulting in failure to send TID RDMA
 476                  * WRITE DATA and TID RDMA ACK packets.
 477                  */
 478                 if (priv->s_flags & HFI1_S_TID_BUSY_SET) {
 479                         priv->s_flags &= ~(HFI1_S_TID_BUSY_SET |
 480                                            RVT_S_BUSY);
 481                         iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
 482                 }
 483         } else {
 484                 priv->s_flags &= ~RVT_S_BUSY;
 485         }
 486 }
 487
 488 static int iowait_sleep(
 489         struct sdma_engine *sde,
 490         struct iowait_work *wait,
 491         struct sdma_txreq *stx,
 492         uint seq,
 493         bool pkts_sent)
 494 {
 495         struct verbs_txreq *tx = container_of(stx, struct verbs_txreq, txreq);
 496         struct rvt_qp *qp;
 497         struct hfi1_qp_priv *priv;
 498         unsigned long flags;
 499         int ret = 0;
 500
 501         qp = tx->qp;
 502         priv = qp->priv;
 503
 504         spin_lock_irqsave(&qp->s_lock, flags);
 505         if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
 506                 /*
 507                  * If we couldn't queue the DMA request, save the info
 508                  * and try again later rather than destroying the
 509                  * buffer and undoing the side effects of the copy.
 510                  */
 511                 /* Make a common routine? */
 512                 list_add_tail(&stx->list, &wait->tx_head);
 513                 write_seqlock(&sde->waitlock);
 514                 if (sdma_progress(sde, seq, stx))
 515                         goto eagain;
 516                 if (list_empty(&priv->s_iowait.list)) {
 517                         struct hfi1_ibport *ibp =
 518                                 to_iport(qp->ibqp.device, qp->port_num);
 519
 520                         ibp->rvp.n_dmawait++;
 521                         qp->s_flags |= RVT_S_WAIT_DMA_DESC;
 522                         iowait_get_priority(&priv->s_iowait);
 523                         iowait_queue(pkts_sent, &priv->s_iowait,
 524                                      &sde->dmawait);
 525                         priv->s_iowait.lock = &sde->waitlock;
 526                         trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
 527                         rvt_get_qp(qp);
 528                 }
 529                 write_sequnlock(&sde->waitlock);
 530                 hfi1_qp_unbusy(qp, wait);
 531                 spin_unlock_irqrestore(&qp->s_lock, flags);
 532                 ret = -EBUSY;
 533         } else {
 534                 spin_unlock_irqrestore(&qp->s_lock, flags);
 535                 hfi1_put_txreq(tx);
 536         }
 537         return ret;
 538 eagain:
 539         write_sequnlock(&sde->waitlock);
 540         spin_unlock_irqrestore(&qp->s_lock, flags);
 541         list_del_init(&stx->list);
 542         return -EAGAIN;
 543 }
 544
 545 static void iowait_wakeup(struct iowait *wait, int reason)
 546 {
 547         struct rvt_qp *qp = iowait_to_qp(wait);
 548
 549         WARN_ON(reason != SDMA_AVAIL_REASON);
 550         hfi1_qp_wakeup(qp, RVT_S_WAIT_DMA_DESC);
 551 }
 552
 553 static void iowait_sdma_drained(struct iowait *wait)
 554 {
 555         struct rvt_qp *qp = iowait_to_qp(wait);
 556         unsigned long flags;
 557
 558         /*
 559          * This happens when the send engine notes
 560          * a QP in the error state and cannot
 561          * do the flush work until that QP's
 562          * sdma work has finished.
 563          */
 564         spin_lock_irqsave(&qp->s_lock, flags);
 565         if (qp->s_flags & RVT_S_WAIT_DMA) {
 566                 qp->s_flags &= ~RVT_S_WAIT_DMA;
 567                 hfi1_schedule_send(qp);
 568         }
 569         spin_unlock_irqrestore(&qp->s_lock, flags);
 570 }
 571
 572 static void hfi1_init_priority(struct iowait *w)
 573 {
 574         struct rvt_qp *qp = iowait_to_qp(w);
 575         struct hfi1_qp_priv *priv = qp->priv;
 576
 577         if (qp->s_flags & RVT_S_ACK_PENDING)
 578                 w->priority++;
 579         if (priv->s_flags & RVT_S_ACK_PENDING)
 580                 w->priority++;
 581 }
 582
 583 /**
 584  * qp_to_sdma_engine - map a qp to a send engine
 585  * @qp: the QP
 586  * @sc5: the 5 bit sc
 587  *
 588  * Return:
 589  * A send engine for the qp or NULL for SMI type qp.
 590  */
 591 struct sdma_engine *qp_to_sdma_engine(struct rvt_qp *qp, u8 sc5)
 592 {
 593         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 594         struct sdma_engine *sde;
 595
 596         if (!(dd->flags & HFI1_HAS_SEND_DMA))
 597                 return NULL;
 598         switch (qp->ibqp.qp_type) {
 599         case IB_QPT_SMI:
 600                 return NULL;
 601         default:
 602                 break;
 603         }
 604         sde = sdma_select_engine_sc(dd, qp->ibqp.qp_num >> dd->qos_shift, sc5);
 605         return sde;
 606 }
 607
 608 /*
 609  * qp_to_send_context - map a qp to a send context
 610  * @qp: the QP
 611  * @sc5: the 5 bit sc
 612  *
 613  * Return:
 614  * A send context for the qp
 615  */
 616 struct send_context *qp_to_send_context(struct rvt_qp *qp, u8 sc5)
 617 {
 618         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 619
 620         switch (qp->ibqp.qp_type) {
 621         case IB_QPT_SMI:
 622                 /* SMA packets to VL15 */
 623                 return dd->vld[15].sc;
 624         default:
 625                 break;
 626         }
 627
 628         return pio_select_send_context_sc(dd, qp->ibqp.qp_num >> dd->qos_shift,
 629                                           sc5);
 630 }
 631
 632 static const char * const qp_type_str[] = {
 633         "SMI", "GSI", "RC", "UC", "UD",
 634 };
 635
 636 static int qp_idle(struct rvt_qp *qp)
 637 {
 638         return
 639                 qp->s_last == qp->s_acked &&
 640                 qp->s_acked == qp->s_cur &&
 641                 qp->s_cur == qp->s_tail &&
 642                 qp->s_tail == qp->s_head;
 643 }
 644
 645 /**
 646  * qp_iter_print - print the qp information to seq_file
 647  * @s: the seq_file to emit the qp information on
 648  * @iter: the iterator for the qp hash list
 649  */
 650 void qp_iter_print(struct seq_file *s, struct rvt_qp_iter *iter)
 651 {
 652         struct rvt_swqe *wqe;
 653         struct rvt_qp *qp = iter->qp;
 654         struct hfi1_qp_priv *priv = qp->priv;
 655         struct sdma_engine *sde;
 656         struct send_context *send_context;
 657         struct rvt_ack_entry *e = NULL;
 658         struct rvt_srq *srq = qp->ibqp.srq ?
 659                 ibsrq_to_rvtsrq(qp->ibqp.srq) : NULL;
 660
 661         sde = qp_to_sdma_engine(qp, priv->s_sc);
 662         wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 663         send_context = qp_to_send_context(qp, priv->s_sc);
 664         if (qp->s_ack_queue)
 665                 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
 666         seq_printf(s,
 667                    "N %d %s QP %x R %u %s %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 RNR %d %s %d\n",
 668                    iter->n,
 669                    qp_idle(qp) ? "I" : "B",
 670                    qp->ibqp.qp_num,
 671                    atomic_read(&qp->refcount),
 672                    qp_type_str[qp->ibqp.qp_type],
 673                    qp->state,
 674                    wqe ? wqe->wr.opcode : 0,
 675                    qp->s_flags,
 676                    iowait_sdma_pending(&priv->s_iowait),
 677                    iowait_pio_pending(&priv->s_iowait),
 678                    !list_empty(&priv->s_iowait.list),
 679                    qp->timeout,
 680                    wqe ? wqe->ssn : 0,
 681                    qp->s_lsn,
 682                    qp->s_last_psn,
 683                    qp->s_psn, qp->s_next_psn,
 684                    qp->s_sending_psn, qp->s_sending_hpsn,
 685                    qp->r_psn,
 686                    qp->s_last, qp->s_acked, qp->s_cur,
 687                    qp->s_tail, qp->s_head, qp->s_size,
 688                    qp->s_avail,
 689                    /* ack_queue ring pointers, size */
 690                    qp->s_tail_ack_queue, qp->r_head_ack_queue,
 691                    rvt_max_atomic(&to_idev(qp->ibqp.device)->rdi),
 692                    /* remote QP info  */
 693                    qp->remote_qpn,
 694                    rdma_ah_get_dlid(&qp->remote_ah_attr),
 695                    rdma_ah_get_sl(&qp->remote_ah_attr),
 696                    qp->pmtu,
 697                    qp->s_retry,
 698                    qp->s_retry_cnt,
 699                    qp->s_rnr_retry_cnt,
 700                    qp->s_rnr_retry,
 701                    sde,
 702                    sde ? sde->this_idx : 0,
 703                    send_context,
 704                    send_context ? send_context->sw_index : 0,
 705                    ib_cq_head(qp->ibqp.send_cq),
 706                    ib_cq_tail(qp->ibqp.send_cq),
 707                    qp->pid,
 708                    qp->s_state,
 709                    qp->s_ack_state,
 710                    /* ack queue information */
 711                    e ? e->opcode : 0,
 712                    e ? e->psn : 0,
 713                    e ? e->lpsn : 0,
 714                    qp->r_min_rnr_timer,
 715                    srq ? "SRQ" : "RQ",
 716                    srq ? srq->rq.size : qp->r_rq.size
 717                 );
 718 }
 719
 720 void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 721 {
 722         struct hfi1_qp_priv *priv;
 723
 724         priv = kzalloc_node(sizeof(*priv), GFP_KERNEL, rdi->dparms.node);
 725         if (!priv)
 726                 return ERR_PTR(-ENOMEM);
 727
 728         priv->owner = qp;
 729
 730         priv->s_ahg = kzalloc_node(sizeof(*priv->s_ahg), GFP_KERNEL,
 731                                    rdi->dparms.node);
 732         if (!priv->s_ahg) {
 733                 kfree(priv);
 734                 return ERR_PTR(-ENOMEM);
 735         }
 736         iowait_init(
 737                 &priv->s_iowait,
 738                 1,
 739                 _hfi1_do_send,
 740                 _hfi1_do_tid_send,
 741                 iowait_sleep,
 742                 iowait_wakeup,
 743                 iowait_sdma_drained,
 744                 hfi1_init_priority);
 745         /* Init to a value to start the running average correctly */
 746         priv->s_running_pkt_size = piothreshold / 2;
 747         return priv;
 748 }
 749
 750 void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 751 {
 752         struct hfi1_qp_priv *priv = qp->priv;
 753
 754         hfi1_qp_priv_tid_free(rdi, qp);
 755         kfree(priv->s_ahg);
 756         kfree(priv);
 757 }
 758
 759 unsigned free_all_qps(struct rvt_dev_info *rdi)
 760 {
 761         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 762                                                     struct hfi1_ibdev,
 763                                                     rdi);
 764         struct hfi1_devdata *dd = container_of(verbs_dev,
 765                                                struct hfi1_devdata,
 766                                                verbs_dev);
 767         int n;
 768         unsigned qp_inuse = 0;
 769
 770         for (n = 0; n < dd->num_pports; n++) {
 771                 struct hfi1_ibport *ibp = &dd->pport[n].ibport_data;
 772
 773                 rcu_read_lock();
 774                 if (rcu_dereference(ibp->rvp.qp[0]))
 775                         qp_inuse++;
 776                 if (rcu_dereference(ibp->rvp.qp[1]))
 777                         qp_inuse++;
 778                 rcu_read_unlock();
 779         }
 780
 781         return qp_inuse;
 782 }
 783
 784 void flush_qp_waiters(struct rvt_qp *qp)
 785 {
 786         lockdep_assert_held(&qp->s_lock);
 787         flush_iowait(qp);
 788         hfi1_tid_rdma_flush_wait(qp);
 789 }
 790
 791 void stop_send_queue(struct rvt_qp *qp)
 792 {
 793         struct hfi1_qp_priv *priv = qp->priv;
 794
 795         iowait_cancel_work(&priv->s_iowait);
 796         if (cancel_work_sync(&priv->tid_rdma.trigger_work))
 797                 rvt_put_qp(qp);
 798 }
 799
 800 void quiesce_qp(struct rvt_qp *qp)
 801 {
 802         struct hfi1_qp_priv *priv = qp->priv;
 803
 804         hfi1_del_tid_reap_timer(qp);
 805         hfi1_del_tid_retry_timer(qp);
 806         iowait_sdma_drain(&priv->s_iowait);
 807         qp_pio_drain(qp);
 808         flush_tx_list(qp);
 809 }
 810
 811 void notify_qp_reset(struct rvt_qp *qp)
 812 {
 813         hfi1_qp_kern_exp_rcv_clear_all(qp);
 814         qp->r_adefered = 0;
 815         clear_ahg(qp);
 816
 817         /* Clear any OPFN state */
 818         if (qp->ibqp.qp_type == IB_QPT_RC)
 819                 opfn_conn_error(qp);
 820 }
 821
 822 /*
 823  * Switch to alternate path.
 824  * The QP s_lock should be held and interrupts disabled.
 825  */
 826 void hfi1_migrate_qp(struct rvt_qp *qp)
 827 {
 828         struct hfi1_qp_priv *priv = qp->priv;
 829         struct ib_event ev;
 830
 831         qp->s_mig_state = IB_MIG_MIGRATED;
 832         qp->remote_ah_attr = qp->alt_ah_attr;
 833         qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
 834         qp->s_pkey_index = qp->s_alt_pkey_index;
 835         qp->s_flags |= HFI1_S_AHG_CLEAR;
 836         priv->s_sc = ah_to_sc(qp->ibqp.device, &qp->remote_ah_attr);
 837         priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 838         qp_set_16b(qp);
 839
 840         ev.device = qp->ibqp.device;
 841         ev.element.qp = &qp->ibqp;
 842         ev.event = IB_EVENT_PATH_MIG;
 843         qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 844 }
 845
 846 int mtu_to_path_mtu(u32 mtu)
 847 {
 848         return mtu_to_enum(mtu, OPA_MTU_8192);
 849 }
 850
 851 u32 mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
 852 {
 853         u32 mtu;
 854         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 855                                                     struct hfi1_ibdev,
 856                                                     rdi);
 857         struct hfi1_devdata *dd = container_of(verbs_dev,
 858                                                struct hfi1_devdata,
 859                                                verbs_dev);
 860         struct hfi1_ibport *ibp;
 861         u8 sc, vl;
 862
 863         ibp = &dd->pport[qp->port_num - 1].ibport_data;
 864         sc = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
 865         vl = sc_to_vlt(dd, sc);
 866
 867         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, pmtu);
 868         if (vl < PER_VL_SEND_CONTEXTS)
 869                 mtu = min_t(u32, mtu, dd->vld[vl].mtu);
 870         return mtu;
 871 }
 872
 873 int get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 874                        struct ib_qp_attr *attr)
 875 {
 876         int mtu, pidx = qp->port_num - 1;
 877         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 878                                                     struct hfi1_ibdev,
 879                                                     rdi);
 880         struct hfi1_devdata *dd = container_of(verbs_dev,
 881                                                struct hfi1_devdata,
 882                                                verbs_dev);
 883         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, attr->path_mtu);
 884         if (mtu == -1)
 885                 return -1; /* values less than 0 are error */
 886
 887         if (mtu > dd->pport[pidx].ibmtu)
 888                 return mtu_to_enum(dd->pport[pidx].ibmtu, IB_MTU_2048);
 889         else
 890                 return attr->path_mtu;
 891 }
 892
 893 void notify_error_qp(struct rvt_qp *qp)
 894 {
 895         struct hfi1_qp_priv *priv = qp->priv;
 896         seqlock_t *lock = priv->s_iowait.lock;
 897
 898         if (lock) {
 899                 write_seqlock(lock);
 900                 if (!list_empty(&priv->s_iowait.list) &&
 901                     !(qp->s_flags & RVT_S_BUSY) &&
 902                     !(priv->s_flags & RVT_S_BUSY)) {
 903                         qp->s_flags &= ~HFI1_S_ANY_WAIT_IO;
 904                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_IB);
 905                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
 906                         list_del_init(&priv->s_iowait.list);
 907                         priv->s_iowait.lock = NULL;
 908                         rvt_put_qp(qp);
 909                 }
 910                 write_sequnlock(lock);
 911         }
 912
 913         if (!(qp->s_flags & RVT_S_BUSY) && !(priv->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_qp_iter_cb - callback for iterator
 925  * @qp - the qp
 926  * @v - the sl in low bits of v
 927  *
 928  * This is called from the iterator callback to work
 929  * on an individual qp.
 930  */
 931 static void hfi1_qp_iter_cb(struct rvt_qp *qp, u64 v)
 932 {
 933         int lastwqe;
 934         struct ib_event ev;
 935         struct hfi1_ibport *ibp =
 936                 to_iport(qp->ibqp.device, qp->port_num);
 937         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 938         u8 sl = (u8)v;
 939
 940         if (qp->port_num != ppd->port ||
 941             (qp->ibqp.qp_type != IB_QPT_UC &&
 942              qp->ibqp.qp_type != IB_QPT_RC) ||
 943             rdma_ah_get_sl(&qp->remote_ah_attr) != sl ||
 944             !(ib_rvt_state_ops[qp->state] & RVT_POST_SEND_OK))
 945                 return;
 946
 947         spin_lock_irq(&qp->r_lock);
 948         spin_lock(&qp->s_hlock);
 949         spin_lock(&qp->s_lock);
 950         lastwqe = rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
 951         spin_unlock(&qp->s_lock);
 952         spin_unlock(&qp->s_hlock);
 953         spin_unlock_irq(&qp->r_lock);
 954         if (lastwqe) {
 955                 ev.device = qp->ibqp.device;
 956                 ev.element.qp = &qp->ibqp;
 957                 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
 958                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 959         }
 960 }
 961
 962 /**
 963  * hfi1_error_port_qps - put a port's RC/UC qps into error state
 964  * @ibp: the ibport.
 965  * @sl: the service level.
 966  *
 967  * This function places all RC/UC qps with a given service level into error
 968  * state. It is generally called to force upper lay apps to abandon stale qps
 969  * after an sl->sc mapping change.
 970  */
 971 void hfi1_error_port_qps(struct hfi1_ibport *ibp, u8 sl)
 972 {
 973         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 974         struct hfi1_ibdev *dev = &ppd->dd->verbs_dev;
 975
 976         rvt_qp_iter(&dev->rdi, sl, hfi1_qp_iter_cb);
 977 }