drivers/infiniband/hw/hfi1/qp.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright(c) 2015 - 2020 Intel Corporation.
   4  */
   5
   6 #include <linux/err.h>
   7 #include <linux/vmalloc.h>
   8 #include <linux/hash.h>
   9 #include <linux/module.h>
  10 #include <linux/seq_file.h>
  11 #include <rdma/rdma_vt.h>
  12 #include <rdma/rdmavt_qp.h>
  13 #include <rdma/ib_verbs.h>
  14
  15 #include "hfi.h"
  16 #include "qp.h"
  17 #include "trace.h"
  18 #include "verbs_txreq.h"
  19
  20 unsigned int hfi1_qp_table_size = 256;
  21 module_param_named(qp_table_size, hfi1_qp_table_size, uint, S_IRUGO);
  22 MODULE_PARM_DESC(qp_table_size, "QP table size");
  23
  24 static void flush_tx_list(struct rvt_qp *qp);
  25 static int iowait_sleep(
  26         struct sdma_engine *sde,
  27         struct iowait_work *wait,
  28         struct sdma_txreq *stx,
  29         unsigned int seq,
  30         bool pkts_sent);
  31 static void iowait_wakeup(struct iowait *wait, int reason);
  32 static void iowait_sdma_drained(struct iowait *wait);
  33 static void qp_pio_drain(struct rvt_qp *qp);
  34
  35 const struct rvt_operation_params hfi1_post_parms[RVT_OPERATION_MAX] = {
  36 [IB_WR_RDMA_WRITE] = {
  37         .length = sizeof(struct ib_rdma_wr),
  38         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  39 },
  40
  41 [IB_WR_RDMA_READ] = {
  42         .length = sizeof(struct ib_rdma_wr),
  43         .qpt_support = BIT(IB_QPT_RC),
  44         .flags = RVT_OPERATION_ATOMIC,
  45 },
  46
  47 [IB_WR_ATOMIC_CMP_AND_SWP] = {
  48         .length = sizeof(struct ib_atomic_wr),
  49         .qpt_support = BIT(IB_QPT_RC),
  50         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
  51 },
  52
  53 [IB_WR_ATOMIC_FETCH_AND_ADD] = {
  54         .length = sizeof(struct ib_atomic_wr),
  55         .qpt_support = BIT(IB_QPT_RC),
  56         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
  57 },
  58
  59 [IB_WR_RDMA_WRITE_WITH_IMM] = {
  60         .length = sizeof(struct ib_rdma_wr),
  61         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  62 },
  63
  64 [IB_WR_SEND] = {
  65         .length = sizeof(struct ib_send_wr),
  66         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
  67                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  68 },
  69
  70 [IB_WR_SEND_WITH_IMM] = {
  71         .length = sizeof(struct ib_send_wr),
  72         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
  73                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  74 },
  75
  76 [IB_WR_REG_MR] = {
  77         .length = sizeof(struct ib_reg_wr),
  78         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  79         .flags = RVT_OPERATION_LOCAL,
  80 },
  81
  82 [IB_WR_LOCAL_INV] = {
  83         .length = sizeof(struct ib_send_wr),
  84         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  85         .flags = RVT_OPERATION_LOCAL,
  86 },
  87
  88 [IB_WR_SEND_WITH_INV] = {
  89         .length = sizeof(struct ib_send_wr),
  90         .qpt_support = BIT(IB_QPT_RC),
  91 },
  92
  93 [IB_WR_OPFN] = {
  94         .length = sizeof(struct ib_atomic_wr),
  95         .qpt_support = BIT(IB_QPT_RC),
  96         .flags = RVT_OPERATION_USE_RESERVE,
  97 },
  98
  99 [IB_WR_TID_RDMA_WRITE] = {
 100         .length = sizeof(struct ib_rdma_wr),
 101         .qpt_support = BIT(IB_QPT_RC),
 102         .flags = RVT_OPERATION_IGN_RNR_CNT,
 103 },
 104
 105 };
 106
 107 static void flush_list_head(struct list_head *l)
 108 {
 109         while (!list_empty(l)) {
 110                 struct sdma_txreq *tx;
 111
 112                 tx = list_first_entry(
 113                         l,
 114                         struct sdma_txreq,
 115                         list);
 116                 list_del_init(&tx->list);
 117                 hfi1_put_txreq(
 118                         container_of(tx, struct verbs_txreq, txreq));
 119         }
 120 }
 121
 122 static void flush_tx_list(struct rvt_qp *qp)
 123 {
 124         struct hfi1_qp_priv *priv = qp->priv;
 125
 126         flush_list_head(&iowait_get_ib_work(&priv->s_iowait)->tx_head);
 127         flush_list_head(&iowait_get_tid_work(&priv->s_iowait)->tx_head);
 128 }
 129
 130 static void flush_iowait(struct rvt_qp *qp)
 131 {
 132         struct hfi1_qp_priv *priv = qp->priv;
 133         unsigned long flags;
 134         seqlock_t *lock = priv->s_iowait.lock;
 135
 136         if (!lock)
 137                 return;
 138         write_seqlock_irqsave(lock, flags);
 139         if (!list_empty(&priv->s_iowait.list)) {
 140                 list_del_init(&priv->s_iowait.list);
 141                 priv->s_iowait.lock = NULL;
 142                 rvt_put_qp(qp);
 143         }
 144         write_sequnlock_irqrestore(lock, flags);
 145 }
 146
 147 /*
 148  * This function is what we would push to the core layer if we wanted to be a
 149  * "first class citizen".  Instead we hide this here and rely on Verbs ULPs
 150  * to blindly pass the MTU enum value from the PathRecord to us.
 151  */
 152 static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
 153 {
 154         /* Constraining 10KB packets to 8KB packets */
 155         if (mtu == (enum ib_mtu)OPA_MTU_10240)
 156                 mtu = (enum ib_mtu)OPA_MTU_8192;
 157         return opa_mtu_enum_to_int((enum opa_mtu)mtu);
 158 }
 159
 160 int hfi1_check_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 161                          int attr_mask, struct ib_udata *udata)
 162 {
 163         struct ib_qp *ibqp = &qp->ibqp;
 164         struct hfi1_ibdev *dev = to_idev(ibqp->device);
 165         struct hfi1_devdata *dd = dd_from_dev(dev);
 166         u8 sc;
 167
 168         if (attr_mask & IB_QP_AV) {
 169                 sc = ah_to_sc(ibqp->device, &attr->ah_attr);
 170                 if (sc == 0xf)
 171                         return -EINVAL;
 172
 173                 if (!qp_to_sdma_engine(qp, sc) &&
 174                     dd->flags & HFI1_HAS_SEND_DMA)
 175                         return -EINVAL;
 176
 177                 if (!qp_to_send_context(qp, sc))
 178                         return -EINVAL;
 179         }
 180
 181         if (attr_mask & IB_QP_ALT_PATH) {
 182                 sc = ah_to_sc(ibqp->device, &attr->alt_ah_attr);
 183                 if (sc == 0xf)
 184                         return -EINVAL;
 185
 186                 if (!qp_to_sdma_engine(qp, sc) &&
 187                     dd->flags & HFI1_HAS_SEND_DMA)
 188                         return -EINVAL;
 189
 190                 if (!qp_to_send_context(qp, sc))
 191                         return -EINVAL;
 192         }
 193
 194         return 0;
 195 }
 196
 197 /*
 198  * qp_set_16b - Set the hdr_type based on whether the slid or the
 199  * dlid in the connection is extended. Only applicable for RC and UC
 200  * QPs. UD QPs determine this on the fly from the ah in the wqe
 201  */
 202 static inline void qp_set_16b(struct rvt_qp *qp)
 203 {
 204         struct hfi1_pportdata *ppd;
 205         struct hfi1_ibport *ibp;
 206         struct hfi1_qp_priv *priv = qp->priv;
 207
 208         /* Update ah_attr to account for extended LIDs */
 209         hfi1_update_ah_attr(qp->ibqp.device, &qp->remote_ah_attr);
 210
 211         /* Create 32 bit LIDs */
 212         hfi1_make_opa_lid(&qp->remote_ah_attr);
 213
 214         if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH))
 215                 return;
 216
 217         ibp = to_iport(qp->ibqp.device, qp->port_num);
 218         ppd = ppd_from_ibp(ibp);
 219         priv->hdr_type = hfi1_get_hdr_type(ppd->lid, &qp->remote_ah_attr);
 220 }
 221
 222 void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
 223                     int attr_mask, struct ib_udata *udata)
 224 {
 225         struct ib_qp *ibqp = &qp->ibqp;
 226         struct hfi1_qp_priv *priv = qp->priv;
 227
 228         if (attr_mask & IB_QP_AV) {
 229                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 230                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 231                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 232                 qp_set_16b(qp);
 233         }
 234
 235         if (attr_mask & IB_QP_PATH_MIG_STATE &&
 236             attr->path_mig_state == IB_MIG_MIGRATED &&
 237             qp->s_mig_state == IB_MIG_ARMED) {
 238                 qp->s_flags |= HFI1_S_AHG_CLEAR;
 239                 priv->s_sc = ah_to_sc(ibqp->device, &qp->remote_ah_attr);
 240                 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 241                 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 242                 qp_set_16b(qp);
 243         }
 244
 245         opfn_qp_init(qp, attr, attr_mask);
 246 }
 247
 248 /**
 249  * hfi1_setup_wqe - set up the wqe
 250  * @qp: The qp
 251  * @wqe: The built wqe
 252  * @call_send: Determine if the send should be posted or scheduled.
 253  *
 254  * Perform setup of the wqe.  This is called
 255  * prior to inserting the wqe into the ring but after
 256  * the wqe has been setup by RDMAVT. This function
 257  * allows the driver the opportunity to perform
 258  * validation and additional setup of the wqe.
 259  *
 260  * Returns 0 on success, -EINVAL on failure
 261  *
 262  */
 263 int hfi1_setup_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe, bool *call_send)
 264 {
 265         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 266         struct rvt_ah *ah;
 267         struct hfi1_pportdata *ppd;
 268         struct hfi1_devdata *dd;
 269
 270         switch (qp->ibqp.qp_type) {
 271         case IB_QPT_RC:
 272                 hfi1_setup_tid_rdma_wqe(qp, wqe);
 273                 fallthrough;
 274         case IB_QPT_UC:
 275                 if (wqe->length > 0x80000000U)
 276                         return -EINVAL;
 277                 if (wqe->length > qp->pmtu)
 278                         *call_send = false;
 279                 break;
 280         case IB_QPT_SMI:
 281                 /*
 282                  * SM packets should exclusively use VL15 and their SL is
 283                  * ignored (IBTA v1.3, Section 3.5.8.2). Therefore, when ah
 284                  * is created, SL is 0 in most cases and as a result some
 285                  * fields (vl and pmtu) in ah may not be set correctly,
 286                  * depending on the SL2SC and SC2VL tables at the time.
 287                  */
 288                 ppd = ppd_from_ibp(ibp);
 289                 dd = dd_from_ppd(ppd);
 290                 if (wqe->length > dd->vld[15].mtu)
 291                         return -EINVAL;
 292                 break;
 293         case IB_QPT_GSI:
 294         case IB_QPT_UD:
 295                 ah = rvt_get_swqe_ah(wqe);
 296                 if (wqe->length > (1 << ah->log_pmtu))
 297                         return -EINVAL;
 298                 if (ibp->sl_to_sc[rdma_ah_get_sl(&ah->attr)] == 0xf)
 299                         return -EINVAL;
 300                 break;
 301         default:
 302                 break;
 303         }
 304
 305         /*
 306          * System latency between send and schedule is large enough that
 307          * forcing call_send to true for piothreshold packets is necessary.
 308          */
 309         if (wqe->length <= piothreshold)
 310                 *call_send = true;
 311         return 0;
 312 }
 313
 314 /**
 315  * _hfi1_schedule_send - schedule progress
 316  * @qp: the QP
 317  *
 318  * This schedules qp progress w/o regard to the s_flags.
 319  *
 320  * It is only used in the post send, which doesn't hold
 321  * the s_lock.
 322  */
 323 bool _hfi1_schedule_send(struct rvt_qp *qp)
 324 {
 325         struct hfi1_qp_priv *priv = qp->priv;
 326         struct hfi1_ibport *ibp =
 327                 to_iport(qp->ibqp.device, qp->port_num);
 328         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 329         struct hfi1_devdata *dd = ppd->dd;
 330
 331         if (dd->flags & HFI1_SHUTDOWN)
 332                 return true;
 333
 334         return iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
 335                                priv->s_sde ?
 336                                priv->s_sde->cpu :
 337                                cpumask_first(cpumask_of_node(dd->node)));
 338 }
 339
 340 static void qp_pio_drain(struct rvt_qp *qp)
 341 {
 342         struct hfi1_qp_priv *priv = qp->priv;
 343
 344         if (!priv->s_sendcontext)
 345                 return;
 346         while (iowait_pio_pending(&priv->s_iowait)) {
 347                 write_seqlock_irq(&priv->s_sendcontext->waitlock);
 348                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 1);
 349                 write_sequnlock_irq(&priv->s_sendcontext->waitlock);
 350                 iowait_pio_drain(&priv->s_iowait);
 351                 write_seqlock_irq(&priv->s_sendcontext->waitlock);
 352                 hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 0);
 353                 write_sequnlock_irq(&priv->s_sendcontext->waitlock);
 354         }
 355 }
 356
 357 /**
 358  * hfi1_schedule_send - schedule progress
 359  * @qp: the QP
 360  *
 361  * This schedules qp progress and caller should hold
 362  * the s_lock.
 363  * @return true if the first leg is scheduled;
 364  * false if the first leg is not scheduled.
 365  */
 366 bool hfi1_schedule_send(struct rvt_qp *qp)
 367 {
 368         lockdep_assert_held(&qp->s_lock);
 369         if (hfi1_send_ok(qp)) {
 370                 _hfi1_schedule_send(qp);
 371                 return true;
 372         }
 373         if (qp->s_flags & HFI1_S_ANY_WAIT_IO)
 374                 iowait_set_flag(&((struct hfi1_qp_priv *)qp->priv)->s_iowait,
 375                                 IOWAIT_PENDING_IB);
 376         return false;
 377 }
 378
 379 static void hfi1_qp_schedule(struct rvt_qp *qp)
 380 {
 381         struct hfi1_qp_priv *priv = qp->priv;
 382         bool ret;
 383
 384         if (iowait_flag_set(&priv->s_iowait, IOWAIT_PENDING_IB)) {
 385                 ret = hfi1_schedule_send(qp);
 386                 if (ret)
 387                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_IB);
 388         }
 389         if (iowait_flag_set(&priv->s_iowait, IOWAIT_PENDING_TID)) {
 390                 ret = hfi1_schedule_tid_send(qp);
 391                 if (ret)
 392                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
 393         }
 394 }
 395
 396 void hfi1_qp_wakeup(struct rvt_qp *qp, u32 flag)
 397 {
 398         unsigned long flags;
 399
 400         spin_lock_irqsave(&qp->s_lock, flags);
 401         if (qp->s_flags & flag) {
 402                 qp->s_flags &= ~flag;
 403                 trace_hfi1_qpwakeup(qp, flag);
 404                 hfi1_qp_schedule(qp);
 405         }
 406         spin_unlock_irqrestore(&qp->s_lock, flags);
 407         /* Notify hfi1_destroy_qp() if it is waiting. */
 408         rvt_put_qp(qp);
 409 }
 410
 411 void hfi1_qp_unbusy(struct rvt_qp *qp, struct iowait_work *wait)
 412 {
 413         struct hfi1_qp_priv *priv = qp->priv;
 414
 415         if (iowait_set_work_flag(wait) == IOWAIT_IB_SE) {
 416                 qp->s_flags &= ~RVT_S_BUSY;
 417                 /*
 418                  * If we are sending a first-leg packet from the second leg,
 419                  * we need to clear the busy flag from priv->s_flags to
 420                  * avoid a race condition when the qp wakes up before
 421                  * the call to hfi1_verbs_send() returns to the second
 422                  * leg. In that case, the second leg will terminate without
 423                  * being re-scheduled, resulting in failure to send TID RDMA
 424                  * WRITE DATA and TID RDMA ACK packets.
 425                  */
 426                 if (priv->s_flags & HFI1_S_TID_BUSY_SET) {
 427                         priv->s_flags &= ~(HFI1_S_TID_BUSY_SET |
 428                                            RVT_S_BUSY);
 429                         iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
 430                 }
 431         } else {
 432                 priv->s_flags &= ~RVT_S_BUSY;
 433         }
 434 }
 435
 436 static int iowait_sleep(
 437         struct sdma_engine *sde,
 438         struct iowait_work *wait,
 439         struct sdma_txreq *stx,
 440         uint seq,
 441         bool pkts_sent)
 442 {
 443         struct verbs_txreq *tx = container_of(stx, struct verbs_txreq, txreq);
 444         struct rvt_qp *qp;
 445         struct hfi1_qp_priv *priv;
 446         unsigned long flags;
 447         int ret = 0;
 448
 449         qp = tx->qp;
 450         priv = qp->priv;
 451
 452         spin_lock_irqsave(&qp->s_lock, flags);
 453         if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
 454                 /*
 455                  * If we couldn't queue the DMA request, save the info
 456                  * and try again later rather than destroying the
 457                  * buffer and undoing the side effects of the copy.
 458                  */
 459                 /* Make a common routine? */
 460                 list_add_tail(&stx->list, &wait->tx_head);
 461                 write_seqlock(&sde->waitlock);
 462                 if (sdma_progress(sde, seq, stx))
 463                         goto eagain;
 464                 if (list_empty(&priv->s_iowait.list)) {
 465                         struct hfi1_ibport *ibp =
 466                                 to_iport(qp->ibqp.device, qp->port_num);
 467
 468                         ibp->rvp.n_dmawait++;
 469                         qp->s_flags |= RVT_S_WAIT_DMA_DESC;
 470                         iowait_get_priority(&priv->s_iowait);
 471                         iowait_queue(pkts_sent, &priv->s_iowait,
 472                                      &sde->dmawait);
 473                         priv->s_iowait.lock = &sde->waitlock;
 474                         trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
 475                         rvt_get_qp(qp);
 476                 }
 477                 write_sequnlock(&sde->waitlock);
 478                 hfi1_qp_unbusy(qp, wait);
 479                 spin_unlock_irqrestore(&qp->s_lock, flags);
 480                 ret = -EBUSY;
 481         } else {
 482                 spin_unlock_irqrestore(&qp->s_lock, flags);
 483                 hfi1_put_txreq(tx);
 484         }
 485         return ret;
 486 eagain:
 487         write_sequnlock(&sde->waitlock);
 488         spin_unlock_irqrestore(&qp->s_lock, flags);
 489         list_del_init(&stx->list);
 490         return -EAGAIN;
 491 }
 492
 493 static void iowait_wakeup(struct iowait *wait, int reason)
 494 {
 495         struct rvt_qp *qp = iowait_to_qp(wait);
 496
 497         WARN_ON(reason != SDMA_AVAIL_REASON);
 498         hfi1_qp_wakeup(qp, RVT_S_WAIT_DMA_DESC);
 499 }
 500
 501 static void iowait_sdma_drained(struct iowait *wait)
 502 {
 503         struct rvt_qp *qp = iowait_to_qp(wait);
 504         unsigned long flags;
 505
 506         /*
 507          * This happens when the send engine notes
 508          * a QP in the error state and cannot
 509          * do the flush work until that QP's
 510          * sdma work has finished.
 511          */
 512         spin_lock_irqsave(&qp->s_lock, flags);
 513         if (qp->s_flags & RVT_S_WAIT_DMA) {
 514                 qp->s_flags &= ~RVT_S_WAIT_DMA;
 515                 hfi1_schedule_send(qp);
 516         }
 517         spin_unlock_irqrestore(&qp->s_lock, flags);
 518 }
 519
 520 static void hfi1_init_priority(struct iowait *w)
 521 {
 522         struct rvt_qp *qp = iowait_to_qp(w);
 523         struct hfi1_qp_priv *priv = qp->priv;
 524
 525         if (qp->s_flags & RVT_S_ACK_PENDING)
 526                 w->priority++;
 527         if (priv->s_flags & RVT_S_ACK_PENDING)
 528                 w->priority++;
 529 }
 530
 531 /**
 532  * qp_to_sdma_engine - map a qp to a send engine
 533  * @qp: the QP
 534  * @sc5: the 5 bit sc
 535  *
 536  * Return:
 537  * A send engine for the qp or NULL for SMI type qp.
 538  */
 539 struct sdma_engine *qp_to_sdma_engine(struct rvt_qp *qp, u8 sc5)
 540 {
 541         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 542         struct sdma_engine *sde;
 543
 544         if (!(dd->flags & HFI1_HAS_SEND_DMA))
 545                 return NULL;
 546         switch (qp->ibqp.qp_type) {
 547         case IB_QPT_SMI:
 548                 return NULL;
 549         default:
 550                 break;
 551         }
 552         sde = sdma_select_engine_sc(dd, qp->ibqp.qp_num >> dd->qos_shift, sc5);
 553         return sde;
 554 }
 555
 556 /**
 557  * qp_to_send_context - map a qp to a send context
 558  * @qp: the QP
 559  * @sc5: the 5 bit sc
 560  *
 561  * Return:
 562  * A send context for the qp
 563  */
 564 struct send_context *qp_to_send_context(struct rvt_qp *qp, u8 sc5)
 565 {
 566         struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 567
 568         switch (qp->ibqp.qp_type) {
 569         case IB_QPT_SMI:
 570                 /* SMA packets to VL15 */
 571                 return dd->vld[15].sc;
 572         default:
 573                 break;
 574         }
 575
 576         return pio_select_send_context_sc(dd, qp->ibqp.qp_num >> dd->qos_shift,
 577                                           sc5);
 578 }
 579
 580 static const char * const qp_type_str[] = {
 581         "SMI", "GSI", "RC", "UC", "UD",
 582 };
 583
 584 static int qp_idle(struct rvt_qp *qp)
 585 {
 586         return
 587                 qp->s_last == qp->s_acked &&
 588                 qp->s_acked == qp->s_cur &&
 589                 qp->s_cur == qp->s_tail &&
 590                 qp->s_tail == qp->s_head;
 591 }
 592
 593 /**
 594  * qp_iter_print - print the qp information to seq_file
 595  * @s: the seq_file to emit the qp information on
 596  * @iter: the iterator for the qp hash list
 597  */
 598 void qp_iter_print(struct seq_file *s, struct rvt_qp_iter *iter)
 599 {
 600         struct rvt_swqe *wqe;
 601         struct rvt_qp *qp = iter->qp;
 602         struct hfi1_qp_priv *priv = qp->priv;
 603         struct sdma_engine *sde;
 604         struct send_context *send_context;
 605         struct rvt_ack_entry *e = NULL;
 606         struct rvt_srq *srq = qp->ibqp.srq ?
 607                 ibsrq_to_rvtsrq(qp->ibqp.srq) : NULL;
 608
 609         sde = qp_to_sdma_engine(qp, priv->s_sc);
 610         wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 611         send_context = qp_to_send_context(qp, priv->s_sc);
 612         if (qp->s_ack_queue)
 613                 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
 614         seq_printf(s,
 615                    "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",
 616                    iter->n,
 617                    qp_idle(qp) ? "I" : "B",
 618                    qp->ibqp.qp_num,
 619                    atomic_read(&qp->refcount),
 620                    qp_type_str[qp->ibqp.qp_type],
 621                    qp->state,
 622                    wqe ? wqe->wr.opcode : 0,
 623                    qp->s_flags,
 624                    iowait_sdma_pending(&priv->s_iowait),
 625                    iowait_pio_pending(&priv->s_iowait),
 626                    !list_empty(&priv->s_iowait.list),
 627                    qp->timeout,
 628                    wqe ? wqe->ssn : 0,
 629                    qp->s_lsn,
 630                    qp->s_last_psn,
 631                    qp->s_psn, qp->s_next_psn,
 632                    qp->s_sending_psn, qp->s_sending_hpsn,
 633                    qp->r_psn,
 634                    qp->s_last, qp->s_acked, qp->s_cur,
 635                    qp->s_tail, qp->s_head, qp->s_size,
 636                    qp->s_avail,
 637                    /* ack_queue ring pointers, size */
 638                    qp->s_tail_ack_queue, qp->r_head_ack_queue,
 639                    rvt_max_atomic(&to_idev(qp->ibqp.device)->rdi),
 640                    /* remote QP info  */
 641                    qp->remote_qpn,
 642                    rdma_ah_get_dlid(&qp->remote_ah_attr),
 643                    rdma_ah_get_sl(&qp->remote_ah_attr),
 644                    qp->pmtu,
 645                    qp->s_retry,
 646                    qp->s_retry_cnt,
 647                    qp->s_rnr_retry_cnt,
 648                    qp->s_rnr_retry,
 649                    sde,
 650                    sde ? sde->this_idx : 0,
 651                    send_context,
 652                    send_context ? send_context->sw_index : 0,
 653                    ib_cq_head(qp->ibqp.send_cq),
 654                    ib_cq_tail(qp->ibqp.send_cq),
 655                    qp->pid,
 656                    qp->s_state,
 657                    qp->s_ack_state,
 658                    /* ack queue information */
 659                    e ? e->opcode : 0,
 660                    e ? e->psn : 0,
 661                    e ? e->lpsn : 0,
 662                    qp->r_min_rnr_timer,
 663                    srq ? "SRQ" : "RQ",
 664                    srq ? srq->rq.size : qp->r_rq.size
 665                 );
 666 }
 667
 668 void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 669 {
 670         struct hfi1_qp_priv *priv;
 671
 672         priv = kzalloc_node(sizeof(*priv), GFP_KERNEL, rdi->dparms.node);
 673         if (!priv)
 674                 return ERR_PTR(-ENOMEM);
 675
 676         priv->owner = qp;
 677
 678         priv->s_ahg = kzalloc_node(sizeof(*priv->s_ahg), GFP_KERNEL,
 679                                    rdi->dparms.node);
 680         if (!priv->s_ahg) {
 681                 kfree(priv);
 682                 return ERR_PTR(-ENOMEM);
 683         }
 684         iowait_init(
 685                 &priv->s_iowait,
 686                 1,
 687                 _hfi1_do_send,
 688                 _hfi1_do_tid_send,
 689                 iowait_sleep,
 690                 iowait_wakeup,
 691                 iowait_sdma_drained,
 692                 hfi1_init_priority);
 693         /* Init to a value to start the running average correctly */
 694         priv->s_running_pkt_size = piothreshold / 2;
 695         return priv;
 696 }
 697
 698 void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 699 {
 700         struct hfi1_qp_priv *priv = qp->priv;
 701
 702         hfi1_qp_priv_tid_free(rdi, qp);
 703         kfree(priv->s_ahg);
 704         kfree(priv);
 705 }
 706
 707 unsigned free_all_qps(struct rvt_dev_info *rdi)
 708 {
 709         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 710                                                     struct hfi1_ibdev,
 711                                                     rdi);
 712         struct hfi1_devdata *dd = container_of(verbs_dev,
 713                                                struct hfi1_devdata,
 714                                                verbs_dev);
 715         int n;
 716         unsigned qp_inuse = 0;
 717
 718         for (n = 0; n < dd->num_pports; n++) {
 719                 struct hfi1_ibport *ibp = &dd->pport[n].ibport_data;
 720
 721                 rcu_read_lock();
 722                 if (rcu_dereference(ibp->rvp.qp[0]))
 723                         qp_inuse++;
 724                 if (rcu_dereference(ibp->rvp.qp[1]))
 725                         qp_inuse++;
 726                 rcu_read_unlock();
 727         }
 728
 729         return qp_inuse;
 730 }
 731
 732 void flush_qp_waiters(struct rvt_qp *qp)
 733 {
 734         lockdep_assert_held(&qp->s_lock);
 735         flush_iowait(qp);
 736         hfi1_tid_rdma_flush_wait(qp);
 737 }
 738
 739 void stop_send_queue(struct rvt_qp *qp)
 740 {
 741         struct hfi1_qp_priv *priv = qp->priv;
 742
 743         iowait_cancel_work(&priv->s_iowait);
 744         if (cancel_work_sync(&priv->tid_rdma.trigger_work))
 745                 rvt_put_qp(qp);
 746 }
 747
 748 void quiesce_qp(struct rvt_qp *qp)
 749 {
 750         struct hfi1_qp_priv *priv = qp->priv;
 751
 752         hfi1_del_tid_reap_timer(qp);
 753         hfi1_del_tid_retry_timer(qp);
 754         iowait_sdma_drain(&priv->s_iowait);
 755         qp_pio_drain(qp);
 756         flush_tx_list(qp);
 757 }
 758
 759 void notify_qp_reset(struct rvt_qp *qp)
 760 {
 761         hfi1_qp_kern_exp_rcv_clear_all(qp);
 762         qp->r_adefered = 0;
 763         clear_ahg(qp);
 764
 765         /* Clear any OPFN state */
 766         if (qp->ibqp.qp_type == IB_QPT_RC)
 767                 opfn_conn_error(qp);
 768 }
 769
 770 /*
 771  * Switch to alternate path.
 772  * The QP s_lock should be held and interrupts disabled.
 773  */
 774 void hfi1_migrate_qp(struct rvt_qp *qp)
 775 {
 776         struct hfi1_qp_priv *priv = qp->priv;
 777         struct ib_event ev;
 778
 779         qp->s_mig_state = IB_MIG_MIGRATED;
 780         qp->remote_ah_attr = qp->alt_ah_attr;
 781         qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
 782         qp->s_pkey_index = qp->s_alt_pkey_index;
 783         qp->s_flags |= HFI1_S_AHG_CLEAR;
 784         priv->s_sc = ah_to_sc(qp->ibqp.device, &qp->remote_ah_attr);
 785         priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 786         qp_set_16b(qp);
 787
 788         ev.device = qp->ibqp.device;
 789         ev.element.qp = &qp->ibqp;
 790         ev.event = IB_EVENT_PATH_MIG;
 791         qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 792 }
 793
 794 int mtu_to_path_mtu(u32 mtu)
 795 {
 796         return mtu_to_enum(mtu, OPA_MTU_8192);
 797 }
 798
 799 u32 mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
 800 {
 801         u32 mtu;
 802         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 803                                                     struct hfi1_ibdev,
 804                                                     rdi);
 805         struct hfi1_devdata *dd = container_of(verbs_dev,
 806                                                struct hfi1_devdata,
 807                                                verbs_dev);
 808         struct hfi1_ibport *ibp;
 809         u8 sc, vl;
 810
 811         ibp = &dd->pport[qp->port_num - 1].ibport_data;
 812         sc = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
 813         vl = sc_to_vlt(dd, sc);
 814
 815         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, pmtu);
 816         if (vl < PER_VL_SEND_CONTEXTS)
 817                 mtu = min_t(u32, mtu, dd->vld[vl].mtu);
 818         return mtu;
 819 }
 820
 821 int get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 822                        struct ib_qp_attr *attr)
 823 {
 824         int mtu, pidx = qp->port_num - 1;
 825         struct hfi1_ibdev *verbs_dev = container_of(rdi,
 826                                                     struct hfi1_ibdev,
 827                                                     rdi);
 828         struct hfi1_devdata *dd = container_of(verbs_dev,
 829                                                struct hfi1_devdata,
 830                                                verbs_dev);
 831         mtu = verbs_mtu_enum_to_int(qp->ibqp.device, attr->path_mtu);
 832         if (mtu == -1)
 833                 return -1; /* values less than 0 are error */
 834
 835         if (mtu > dd->pport[pidx].ibmtu)
 836                 return mtu_to_enum(dd->pport[pidx].ibmtu, IB_MTU_2048);
 837         else
 838                 return attr->path_mtu;
 839 }
 840
 841 void notify_error_qp(struct rvt_qp *qp)
 842 {
 843         struct hfi1_qp_priv *priv = qp->priv;
 844         seqlock_t *lock = priv->s_iowait.lock;
 845
 846         if (lock) {
 847                 write_seqlock(lock);
 848                 if (!list_empty(&priv->s_iowait.list) &&
 849                     !(qp->s_flags & RVT_S_BUSY) &&
 850                     !(priv->s_flags & RVT_S_BUSY)) {
 851                         qp->s_flags &= ~HFI1_S_ANY_WAIT_IO;
 852                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_IB);
 853                         iowait_clear_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
 854                         list_del_init(&priv->s_iowait.list);
 855                         priv->s_iowait.lock = NULL;
 856                         rvt_put_qp(qp);
 857                 }
 858                 write_sequnlock(lock);
 859         }
 860
 861         if (!(qp->s_flags & RVT_S_BUSY) && !(priv->s_flags & RVT_S_BUSY)) {
 862                 qp->s_hdrwords = 0;
 863                 if (qp->s_rdma_mr) {
 864                         rvt_put_mr(qp->s_rdma_mr);
 865                         qp->s_rdma_mr = NULL;
 866                 }
 867                 flush_tx_list(qp);
 868         }
 869 }
 870
 871 /**
 872  * hfi1_qp_iter_cb - callback for iterator
 873  * @qp: the qp
 874  * @v: the sl in low bits of v
 875  *
 876  * This is called from the iterator callback to work
 877  * on an individual qp.
 878  */
 879 static void hfi1_qp_iter_cb(struct rvt_qp *qp, u64 v)
 880 {
 881         int lastwqe;
 882         struct ib_event ev;
 883         struct hfi1_ibport *ibp =
 884                 to_iport(qp->ibqp.device, qp->port_num);
 885         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 886         u8 sl = (u8)v;
 887
 888         if (qp->port_num != ppd->port ||
 889             (qp->ibqp.qp_type != IB_QPT_UC &&
 890              qp->ibqp.qp_type != IB_QPT_RC) ||
 891             rdma_ah_get_sl(&qp->remote_ah_attr) != sl ||
 892             !(ib_rvt_state_ops[qp->state] & RVT_POST_SEND_OK))
 893                 return;
 894
 895         spin_lock_irq(&qp->r_lock);
 896         spin_lock(&qp->s_hlock);
 897         spin_lock(&qp->s_lock);
 898         lastwqe = rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
 899         spin_unlock(&qp->s_lock);
 900         spin_unlock(&qp->s_hlock);
 901         spin_unlock_irq(&qp->r_lock);
 902         if (lastwqe) {
 903                 ev.device = qp->ibqp.device;
 904                 ev.element.qp = &qp->ibqp;
 905                 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
 906                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 907         }
 908 }
 909
 910 /**
 911  * hfi1_error_port_qps - put a port's RC/UC qps into error state
 912  * @ibp: the ibport.
 913  * @sl: the service level.
 914  *
 915  * This function places all RC/UC qps with a given service level into error
 916  * state. It is generally called to force upper lay apps to abandon stale qps
 917  * after an sl->sc mapping change.
 918  */
 919 void hfi1_error_port_qps(struct hfi1_ibport *ibp, u8 sl)
 920 {
 921         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 922         struct hfi1_ibdev *dev = &ppd->dd->verbs_dev;
 923
 924         rvt_qp_iter(&dev->rdi, sl, hfi1_qp_iter_cb);
 925 }