drivers/infiniband/hw/qib/qib_qp.c

   1 /*
   2  * Copyright (c) 2012, 2013 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2006 - 2012 QLogic Corporation.  * All rights reserved.
   4  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/err.h>
  36 #include <linux/vmalloc.h>
  37 #include <rdma/rdma_vt.h>
  38 #ifdef CONFIG_DEBUG_FS
  39 #include <linux/seq_file.h>
  40 #endif
  41
  42 #include "qib.h"
  43
  44 static inline unsigned mk_qpn(struct rvt_qpn_table *qpt,
  45                               struct rvt_qpn_map *map, unsigned off)
  46 {
  47         return (map - qpt->map) * RVT_BITS_PER_PAGE + off;
  48 }
  49
  50 static inline unsigned find_next_offset(struct rvt_qpn_table *qpt,
  51                                         struct rvt_qpn_map *map, unsigned off,
  52                                         unsigned n, u16 qpt_mask)
  53 {
  54         if (qpt_mask) {
  55                 off++;
  56                 if (((off & qpt_mask) >> 1) >= n)
  57                         off = (off | qpt_mask) + 2;
  58         } else {
  59                 off = find_next_zero_bit(map->page, RVT_BITS_PER_PAGE, off);
  60         }
  61         return off;
  62 }
  63
  64 const struct rvt_operation_params qib_post_parms[RVT_OPERATION_MAX] = {
  65 [IB_WR_RDMA_WRITE] = {
  66         .length = sizeof(struct ib_rdma_wr),
  67         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  68 },
  69
  70 [IB_WR_RDMA_READ] = {
  71         .length = sizeof(struct ib_rdma_wr),
  72         .qpt_support = BIT(IB_QPT_RC),
  73         .flags = RVT_OPERATION_ATOMIC,
  74 },
  75
  76 [IB_WR_ATOMIC_CMP_AND_SWP] = {
  77         .length = sizeof(struct ib_atomic_wr),
  78         .qpt_support = BIT(IB_QPT_RC),
  79         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
  80 },
  81
  82 [IB_WR_ATOMIC_FETCH_AND_ADD] = {
  83         .length = sizeof(struct ib_atomic_wr),
  84         .qpt_support = BIT(IB_QPT_RC),
  85         .flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
  86 },
  87
  88 [IB_WR_RDMA_WRITE_WITH_IMM] = {
  89         .length = sizeof(struct ib_rdma_wr),
  90         .qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  91 },
  92
  93 [IB_WR_SEND] = {
  94         .length = sizeof(struct ib_send_wr),
  95         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
  96                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
  97 },
  98
  99 [IB_WR_SEND_WITH_IMM] = {
 100         .length = sizeof(struct ib_send_wr),
 101         .qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
 102                        BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
 103 },
 104
 105 };
 106
 107 static void get_map_page(struct rvt_qpn_table *qpt, struct rvt_qpn_map *map,
 108                          gfp_t gfp)
 109 {
 110         unsigned long page = get_zeroed_page(gfp);
 111
 112         /*
 113          * Free the page if someone raced with us installing it.
 114          */
 115
 116         spin_lock(&qpt->lock);
 117         if (map->page)
 118                 free_page(page);
 119         else
 120                 map->page = (void *)page;
 121         spin_unlock(&qpt->lock);
 122 }
 123
 124 /*
 125  * Allocate the next available QPN or
 126  * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
 127  */
 128 int qib_alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
 129                   enum ib_qp_type type, u8 port, gfp_t gfp)
 130 {
 131         u32 i, offset, max_scan, qpn;
 132         struct rvt_qpn_map *map;
 133         u32 ret;
 134         struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
 135         struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
 136                                               verbs_dev);
 137         u16 qpt_mask = dd->qpn_mask;
 138
 139         if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
 140                 unsigned n;
 141
 142                 ret = type == IB_QPT_GSI;
 143                 n = 1 << (ret + 2 * (port - 1));
 144                 spin_lock(&qpt->lock);
 145                 if (qpt->flags & n)
 146                         ret = -EINVAL;
 147                 else
 148                         qpt->flags |= n;
 149                 spin_unlock(&qpt->lock);
 150                 goto bail;
 151         }
 152
 153         qpn = qpt->last + 2;
 154         if (qpn >= RVT_QPN_MAX)
 155                 qpn = 2;
 156         if (qpt_mask && ((qpn & qpt_mask) >> 1) >= dd->n_krcv_queues)
 157                 qpn = (qpn | qpt_mask) + 2;
 158         offset = qpn & RVT_BITS_PER_PAGE_MASK;
 159         map = &qpt->map[qpn / RVT_BITS_PER_PAGE];
 160         max_scan = qpt->nmaps - !offset;
 161         for (i = 0;;) {
 162                 if (unlikely(!map->page)) {
 163                         get_map_page(qpt, map, gfp);
 164                         if (unlikely(!map->page))
 165                                 break;
 166                 }
 167                 do {
 168                         if (!test_and_set_bit(offset, map->page)) {
 169                                 qpt->last = qpn;
 170                                 ret = qpn;
 171                                 goto bail;
 172                         }
 173                         offset = find_next_offset(qpt, map, offset,
 174                                 dd->n_krcv_queues, qpt_mask);
 175                         qpn = mk_qpn(qpt, map, offset);
 176                         /*
 177                          * This test differs from alloc_pidmap().
 178                          * If find_next_offset() does find a zero
 179                          * bit, we don't need to check for QPN
 180                          * wrapping around past our starting QPN.
 181                          * We just need to be sure we don't loop
 182                          * forever.
 183                          */
 184                 } while (offset < RVT_BITS_PER_PAGE && qpn < RVT_QPN_MAX);
 185                 /*
 186                  * In order to keep the number of pages allocated to a
 187                  * minimum, we scan the all existing pages before increasing
 188                  * the size of the bitmap table.
 189                  */
 190                 if (++i > max_scan) {
 191                         if (qpt->nmaps == RVT_QPNMAP_ENTRIES)
 192                                 break;
 193                         map = &qpt->map[qpt->nmaps++];
 194                         offset = 0;
 195                 } else if (map < &qpt->map[qpt->nmaps]) {
 196                         ++map;
 197                         offset = 0;
 198                 } else {
 199                         map = &qpt->map[0];
 200                         offset = 2;
 201                 }
 202                 qpn = mk_qpn(qpt, map, offset);
 203         }
 204
 205         ret = -ENOMEM;
 206
 207 bail:
 208         return ret;
 209 }
 210
 211 /**
 212  * qib_free_all_qps - check for QPs still in use
 213  */
 214 unsigned qib_free_all_qps(struct rvt_dev_info *rdi)
 215 {
 216         struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
 217         struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
 218                                               verbs_dev);
 219         unsigned n, qp_inuse = 0;
 220
 221         for (n = 0; n < dd->num_pports; n++) {
 222                 struct qib_ibport *ibp = &dd->pport[n].ibport_data;
 223
 224                 rcu_read_lock();
 225                 if (rcu_dereference(ibp->rvp.qp[0]))
 226                         qp_inuse++;
 227                 if (rcu_dereference(ibp->rvp.qp[1]))
 228                         qp_inuse++;
 229                 rcu_read_unlock();
 230         }
 231         return qp_inuse;
 232 }
 233
 234 void qib_notify_qp_reset(struct rvt_qp *qp)
 235 {
 236         struct qib_qp_priv *priv = qp->priv;
 237
 238         atomic_set(&priv->s_dma_busy, 0);
 239 }
 240
 241 void qib_notify_error_qp(struct rvt_qp *qp)
 242 {
 243         struct qib_qp_priv *priv = qp->priv;
 244         struct qib_ibdev *dev = to_idev(qp->ibqp.device);
 245
 246         spin_lock(&dev->rdi.pending_lock);
 247         if (!list_empty(&priv->iowait) && !(qp->s_flags & RVT_S_BUSY)) {
 248                 qp->s_flags &= ~RVT_S_ANY_WAIT_IO;
 249                 list_del_init(&priv->iowait);
 250         }
 251         spin_unlock(&dev->rdi.pending_lock);
 252
 253         if (!(qp->s_flags & RVT_S_BUSY)) {
 254                 qp->s_hdrwords = 0;
 255                 if (qp->s_rdma_mr) {
 256                         rvt_put_mr(qp->s_rdma_mr);
 257                         qp->s_rdma_mr = NULL;
 258                 }
 259                 if (priv->s_tx) {
 260                         qib_put_txreq(priv->s_tx);
 261                         priv->s_tx = NULL;
 262                 }
 263         }
 264 }
 265
 266 static int mtu_to_enum(u32 mtu)
 267 {
 268         int enum_mtu;
 269
 270         switch (mtu) {
 271         case 4096:
 272                 enum_mtu = IB_MTU_4096;
 273                 break;
 274         case 2048:
 275                 enum_mtu = IB_MTU_2048;
 276                 break;
 277         case 1024:
 278                 enum_mtu = IB_MTU_1024;
 279                 break;
 280         case 512:
 281                 enum_mtu = IB_MTU_512;
 282                 break;
 283         case 256:
 284                 enum_mtu = IB_MTU_256;
 285                 break;
 286         default:
 287                 enum_mtu = IB_MTU_2048;
 288         }
 289         return enum_mtu;
 290 }
 291
 292 int qib_get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 293                            struct ib_qp_attr *attr)
 294 {
 295         int mtu, pmtu, pidx = qp->port_num - 1;
 296         struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
 297         struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
 298                                               verbs_dev);
 299         mtu = ib_mtu_enum_to_int(attr->path_mtu);
 300         if (mtu == -1)
 301                 return -EINVAL;
 302
 303         if (mtu > dd->pport[pidx].ibmtu)
 304                 pmtu = mtu_to_enum(dd->pport[pidx].ibmtu);
 305         else
 306                 pmtu = attr->path_mtu;
 307         return pmtu;
 308 }
 309
 310 int qib_mtu_to_path_mtu(u32 mtu)
 311 {
 312         return mtu_to_enum(mtu);
 313 }
 314
 315 u32 qib_mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
 316 {
 317         return ib_mtu_enum_to_int(pmtu);
 318 }
 319
 320 void *qib_qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp, gfp_t gfp)
 321 {
 322         struct qib_qp_priv *priv;
 323
 324         priv = kzalloc(sizeof(*priv), gfp);
 325         if (!priv)
 326                 return ERR_PTR(-ENOMEM);
 327         priv->owner = qp;
 328
 329         priv->s_hdr = kzalloc(sizeof(*priv->s_hdr), gfp);
 330         if (!priv->s_hdr) {
 331                 kfree(priv);
 332                 return ERR_PTR(-ENOMEM);
 333         }
 334         init_waitqueue_head(&priv->wait_dma);
 335         INIT_WORK(&priv->s_work, _qib_do_send);
 336         INIT_LIST_HEAD(&priv->iowait);
 337
 338         return priv;
 339 }
 340
 341 void qib_qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 342 {
 343         struct qib_qp_priv *priv = qp->priv;
 344
 345         kfree(priv->s_hdr);
 346         kfree(priv);
 347 }
 348
 349 void qib_stop_send_queue(struct rvt_qp *qp)
 350 {
 351         struct qib_qp_priv *priv = qp->priv;
 352
 353         cancel_work_sync(&priv->s_work);
 354 }
 355
 356 void qib_quiesce_qp(struct rvt_qp *qp)
 357 {
 358         struct qib_qp_priv *priv = qp->priv;
 359
 360         wait_event(priv->wait_dma, !atomic_read(&priv->s_dma_busy));
 361         if (priv->s_tx) {
 362                 qib_put_txreq(priv->s_tx);
 363                 priv->s_tx = NULL;
 364         }
 365 }
 366
 367 void qib_flush_qp_waiters(struct rvt_qp *qp)
 368 {
 369         struct qib_qp_priv *priv = qp->priv;
 370         struct qib_ibdev *dev = to_idev(qp->ibqp.device);
 371
 372         spin_lock(&dev->rdi.pending_lock);
 373         if (!list_empty(&priv->iowait))
 374                 list_del_init(&priv->iowait);
 375         spin_unlock(&dev->rdi.pending_lock);
 376 }
 377
 378 /**
 379  * qib_check_send_wqe - validate wr/wqe
 380  * @qp - The qp
 381  * @wqe - The built wqe
 382  *
 383  * validate wr/wqe.  This is called
 384  * prior to inserting the wqe into
 385  * the ring but after the wqe has been
 386  * setup.
 387  *
 388  * Returns 1 to force direct progress, 0 otherwise, -EINVAL on failure
 389  */
 390 int qib_check_send_wqe(struct rvt_qp *qp,
 391                        struct rvt_swqe *wqe)
 392 {
 393         struct rvt_ah *ah;
 394         int ret = 0;
 395
 396         switch (qp->ibqp.qp_type) {
 397         case IB_QPT_RC:
 398         case IB_QPT_UC:
 399                 if (wqe->length > 0x80000000U)
 400                         return -EINVAL;
 401                 break;
 402         case IB_QPT_SMI:
 403         case IB_QPT_GSI:
 404         case IB_QPT_UD:
 405                 ah = ibah_to_rvtah(wqe->ud_wr.ah);
 406                 if (wqe->length > (1 << ah->log_pmtu))
 407                         return -EINVAL;
 408                 /* progress hint */
 409                 ret = 1;
 410                 break;
 411         default:
 412                 break;
 413         }
 414         return ret;
 415 }
 416
 417 #ifdef CONFIG_DEBUG_FS
 418
 419 struct qib_qp_iter {
 420         struct qib_ibdev *dev;
 421         struct rvt_qp *qp;
 422         int n;
 423 };
 424
 425 struct qib_qp_iter *qib_qp_iter_init(struct qib_ibdev *dev)
 426 {
 427         struct qib_qp_iter *iter;
 428
 429         iter = kzalloc(sizeof(*iter), GFP_KERNEL);
 430         if (!iter)
 431                 return NULL;
 432
 433         iter->dev = dev;
 434
 435         return iter;
 436 }
 437
 438 int qib_qp_iter_next(struct qib_qp_iter *iter)
 439 {
 440         struct qib_ibdev *dev = iter->dev;
 441         int n = iter->n;
 442         int ret = 1;
 443         struct rvt_qp *pqp = iter->qp;
 444         struct rvt_qp *qp;
 445
 446         for (; n < dev->rdi.qp_dev->qp_table_size; n++) {
 447                 if (pqp)
 448                         qp = rcu_dereference(pqp->next);
 449                 else
 450                         qp = rcu_dereference(dev->rdi.qp_dev->qp_table[n]);
 451                 pqp = qp;
 452                 if (qp) {
 453                         iter->qp = qp;
 454                         iter->n = n;
 455                         return 0;
 456                 }
 457         }
 458         return ret;
 459 }
 460
 461 static const char * const qp_type_str[] = {
 462         "SMI", "GSI", "RC", "UC", "UD",
 463 };
 464
 465 void qib_qp_iter_print(struct seq_file *s, struct qib_qp_iter *iter)
 466 {
 467         struct rvt_swqe *wqe;
 468         struct rvt_qp *qp = iter->qp;
 469         struct qib_qp_priv *priv = qp->priv;
 470
 471         wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 472         seq_printf(s,
 473                    "N %d QP%u %s %u %u %u f=%x %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u) QP%u LID %x\n",
 474                    iter->n,
 475                    qp->ibqp.qp_num,
 476                    qp_type_str[qp->ibqp.qp_type],
 477                    qp->state,
 478                    wqe->wr.opcode,
 479                    qp->s_hdrwords,
 480                    qp->s_flags,
 481                    atomic_read(&priv->s_dma_busy),
 482                    !list_empty(&priv->iowait),
 483                    qp->timeout,
 484                    wqe->ssn,
 485                    qp->s_lsn,
 486                    qp->s_last_psn,
 487                    qp->s_psn, qp->s_next_psn,
 488                    qp->s_sending_psn, qp->s_sending_hpsn,
 489                    qp->s_last, qp->s_acked, qp->s_cur,
 490                    qp->s_tail, qp->s_head, qp->s_size,
 491                    qp->remote_qpn,
 492                    rdma_ah_get_dlid(&qp->remote_ah_attr));
 493 }
 494
 495 #endif