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verbs.c

/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: verbs.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>

int ib_rate_to_mult(enum ib_rate rate)
{
      switch (rate) {
      case IB_RATE_2_5_GBPS: return  1;
      case IB_RATE_5_GBPS:   return  2;
      case IB_RATE_10_GBPS:  return  4;
      case IB_RATE_20_GBPS:  return  8;
      case IB_RATE_30_GBPS:  return 12;
      case IB_RATE_40_GBPS:  return 16;
      case IB_RATE_60_GBPS:  return 24;
      case IB_RATE_80_GBPS:  return 32;
      case IB_RATE_120_GBPS: return 48;
      default:           return -1;
      }
}
EXPORT_SYMBOL(ib_rate_to_mult);

enum ib_rate mult_to_ib_rate(int mult)
{
      switch (mult) {
      case 1:  return IB_RATE_2_5_GBPS;
      case 2:  return IB_RATE_5_GBPS;
      case 4:  return IB_RATE_10_GBPS;
      case 8:  return IB_RATE_20_GBPS;
      case 12: return IB_RATE_30_GBPS;
      case 16: return IB_RATE_40_GBPS;
      case 24: return IB_RATE_60_GBPS;
      case 32: return IB_RATE_80_GBPS;
      case 48: return IB_RATE_120_GBPS;
      default: return IB_RATE_PORT_CURRENT;
      }
}
EXPORT_SYMBOL(mult_to_ib_rate);

enum rdma_transport_type
rdma_node_get_transport(enum rdma_node_type node_type)
{
      switch (node_type) {
      case RDMA_NODE_IB_CA:
      case RDMA_NODE_IB_SWITCH:
      case RDMA_NODE_IB_ROUTER:
            return RDMA_TRANSPORT_IB;
      case RDMA_NODE_RNIC:
            return RDMA_TRANSPORT_IWARP;
      default:
            BUG();
            return 0;
      }
}
EXPORT_SYMBOL(rdma_node_get_transport);

/* Protection domains */

struct ib_pd *ib_alloc_pd(struct ib_device *device)
{
      struct ib_pd *pd;

      pd = device->alloc_pd(device, NULL, NULL);

      if (!IS_ERR(pd)) {
            pd->device  = device;
            pd->uobject = NULL;
            atomic_set(&pd->usecnt, 0);
      }

      return pd;
}
EXPORT_SYMBOL(ib_alloc_pd);

int ib_dealloc_pd(struct ib_pd *pd)
{
      if (atomic_read(&pd->usecnt))
            return -EBUSY;

      return pd->device->dealloc_pd(pd);
}
EXPORT_SYMBOL(ib_dealloc_pd);

/* Address handles */

struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
{
      struct ib_ah *ah;

      ah = pd->device->create_ah(pd, ah_attr);

      if (!IS_ERR(ah)) {
            ah->device  = pd->device;
            ah->pd      = pd;
            ah->uobject = NULL;
            atomic_inc(&pd->usecnt);
      }

      return ah;
}
EXPORT_SYMBOL(ib_create_ah);

int ib_init_ah_from_wc(struct ib_device *device, u8 port_num, struct ib_wc *wc,
                   struct ib_grh *grh, struct ib_ah_attr *ah_attr)
{
      u32 flow_class;
      u16 gid_index;
      int ret;

      memset(ah_attr, 0, sizeof *ah_attr);
      ah_attr->dlid = wc->slid;
      ah_attr->sl = wc->sl;
      ah_attr->src_path_bits = wc->dlid_path_bits;
      ah_attr->port_num = port_num;

      if (wc->wc_flags & IB_WC_GRH) {
            ah_attr->ah_flags = IB_AH_GRH;
            ah_attr->grh.dgid = grh->sgid;

            ret = ib_find_cached_gid(device, &grh->dgid, &port_num,
                               &gid_index);
            if (ret)
                  return ret;

            ah_attr->grh.sgid_index = (u8) gid_index;
            flow_class = be32_to_cpu(grh->version_tclass_flow);
            ah_attr->grh.flow_label = flow_class & 0xFFFFF;
            ah_attr->grh.hop_limit = 0xFF;
            ah_attr->grh.traffic_class = (flow_class >> 20) & 0xFF;
      }
      return 0;
}
EXPORT_SYMBOL(ib_init_ah_from_wc);

struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, struct ib_wc *wc,
                           struct ib_grh *grh, u8 port_num)
{
      struct ib_ah_attr ah_attr;
      int ret;

      ret = ib_init_ah_from_wc(pd->device, port_num, wc, grh, &ah_attr);
      if (ret)
            return ERR_PTR(ret);

      return ib_create_ah(pd, &ah_attr);
}
EXPORT_SYMBOL(ib_create_ah_from_wc);

int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
{
      return ah->device->modify_ah ?
            ah->device->modify_ah(ah, ah_attr) :
            -ENOSYS;
}
EXPORT_SYMBOL(ib_modify_ah);

int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
{
      return ah->device->query_ah ?
            ah->device->query_ah(ah, ah_attr) :
            -ENOSYS;
}
EXPORT_SYMBOL(ib_query_ah);

int ib_destroy_ah(struct ib_ah *ah)
{
      struct ib_pd *pd;
      int ret;

      pd = ah->pd;
      ret = ah->device->destroy_ah(ah);
      if (!ret)
            atomic_dec(&pd->usecnt);

      return ret;
}
EXPORT_SYMBOL(ib_destroy_ah);

/* Shared receive queues */

struct ib_srq *ib_create_srq(struct ib_pd *pd,
                       struct ib_srq_init_attr *srq_init_attr)
{
      struct ib_srq *srq;

      if (!pd->device->create_srq)
            return ERR_PTR(-ENOSYS);

      srq = pd->device->create_srq(pd, srq_init_attr, NULL);

      if (!IS_ERR(srq)) {
            srq->device          = pd->device;
            srq->pd              = pd;
            srq->uobject       = NULL;
            srq->event_handler = srq_init_attr->event_handler;
            srq->srq_context   = srq_init_attr->srq_context;
            atomic_inc(&pd->usecnt);
            atomic_set(&srq->usecnt, 0);
      }

      return srq;
}
EXPORT_SYMBOL(ib_create_srq);

int ib_modify_srq(struct ib_srq *srq,
              struct ib_srq_attr *srq_attr,
              enum ib_srq_attr_mask srq_attr_mask)
{
      return srq->device->modify_srq(srq, srq_attr, srq_attr_mask, NULL);
}
EXPORT_SYMBOL(ib_modify_srq);

int ib_query_srq(struct ib_srq *srq,
             struct ib_srq_attr *srq_attr)
{
      return srq->device->query_srq ?
            srq->device->query_srq(srq, srq_attr) : -ENOSYS;
}
EXPORT_SYMBOL(ib_query_srq);

int ib_destroy_srq(struct ib_srq *srq)
{
      struct ib_pd *pd;
      int ret;

      if (atomic_read(&srq->usecnt))
            return -EBUSY;

      pd = srq->pd;

      ret = srq->device->destroy_srq(srq);
      if (!ret)
            atomic_dec(&pd->usecnt);

      return ret;
}
EXPORT_SYMBOL(ib_destroy_srq);

/* Queue pairs */

struct ib_qp *ib_create_qp(struct ib_pd *pd,
                     struct ib_qp_init_attr *qp_init_attr)
{
      struct ib_qp *qp;

      qp = pd->device->create_qp(pd, qp_init_attr, NULL);

      if (!IS_ERR(qp)) {
            qp->device          = pd->device;
            qp->pd              = pd;
            qp->send_cq         = qp_init_attr->send_cq;
            qp->recv_cq         = qp_init_attr->recv_cq;
            qp->srq                   = qp_init_attr->srq;
            qp->uobject       = NULL;
            qp->event_handler = qp_init_attr->event_handler;
            qp->qp_context    = qp_init_attr->qp_context;
            qp->qp_type   = qp_init_attr->qp_type;
            atomic_inc(&pd->usecnt);
            atomic_inc(&qp_init_attr->send_cq->usecnt);
            atomic_inc(&qp_init_attr->recv_cq->usecnt);
            if (qp_init_attr->srq)
                  atomic_inc(&qp_init_attr->srq->usecnt);
      }

      return qp;
}
EXPORT_SYMBOL(ib_create_qp);

static const struct {
      int               valid;
      enum ib_qp_attr_mask    req_param[IB_QPT_RAW_ETY + 1];
      enum ib_qp_attr_mask    opt_param[IB_QPT_RAW_ETY + 1];
} qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
      [IB_QPS_RESET] = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR]   = { .valid = 1 },
            [IB_QPS_INIT]  = {
                  .valid = 1,
                  .req_param = {
                        [IB_QPT_UD]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_PORT              |
                                    IB_QP_QKEY),
                        [IB_QPT_UC]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_PORT              |
                                    IB_QP_ACCESS_FLAGS),
                        [IB_QPT_RC]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_PORT              |
                                    IB_QP_ACCESS_FLAGS),
                        [IB_QPT_SMI] = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                        [IB_QPT_GSI] = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                  }
            },
      },
      [IB_QPS_INIT]  = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR] =   { .valid = 1 },
            [IB_QPS_INIT]  = {
                  .valid = 1,
                  .opt_param = {
                        [IB_QPT_UD]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_PORT              |
                                    IB_QP_QKEY),
                        [IB_QPT_UC]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_PORT              |
                                    IB_QP_ACCESS_FLAGS),
                        [IB_QPT_RC]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_PORT              |
                                    IB_QP_ACCESS_FLAGS),
                        [IB_QPT_SMI] = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                        [IB_QPT_GSI] = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                  }
            },
            [IB_QPS_RTR]   = {
                  .valid = 1,
                  .req_param = {
                        [IB_QPT_UC]  = (IB_QP_AV                  |
                                    IB_QP_PATH_MTU                |
                                    IB_QP_DEST_QPN                |
                                    IB_QP_RQ_PSN),
                        [IB_QPT_RC]  = (IB_QP_AV                  |
                                    IB_QP_PATH_MTU                |
                                    IB_QP_DEST_QPN                |
                                    IB_QP_RQ_PSN                  |
                                    IB_QP_MAX_DEST_RD_ATOMIC      |
                                    IB_QP_MIN_RNR_TIMER),
                  },
                  .opt_param = {
                         [IB_QPT_UD]  = (IB_QP_PKEY_INDEX         |
                                     IB_QP_QKEY),
                         [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
                                     IB_QP_ACCESS_FLAGS           |
                                     IB_QP_PKEY_INDEX),
                         [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
                                     IB_QP_ACCESS_FLAGS           |
                                     IB_QP_PKEY_INDEX),
                         [IB_QPT_SMI] = (IB_QP_PKEY_INDEX         |
                                     IB_QP_QKEY),
                         [IB_QPT_GSI] = (IB_QP_PKEY_INDEX         |
                                     IB_QP_QKEY),
                   }
            }
      },
      [IB_QPS_RTR]   = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR] =   { .valid = 1 },
            [IB_QPS_RTS]   = {
                  .valid = 1,
                  .req_param = {
                        [IB_QPT_UD]  = IB_QP_SQ_PSN,
                        [IB_QPT_UC]  = IB_QP_SQ_PSN,
                        [IB_QPT_RC]  = (IB_QP_TIMEOUT             |
                                    IB_QP_RETRY_CNT               |
                                    IB_QP_RNR_RETRY               |
                                    IB_QP_SQ_PSN                  |
                                    IB_QP_MAX_QP_RD_ATOMIC),
                        [IB_QPT_SMI] = IB_QP_SQ_PSN,
                        [IB_QPT_GSI] = IB_QP_SQ_PSN,
                  },
                  .opt_param = {
                         [IB_QPT_UD]  = (IB_QP_CUR_STATE          |
                                     IB_QP_QKEY),
                         [IB_QPT_UC]  = (IB_QP_CUR_STATE          |
                                     IB_QP_ALT_PATH               |
                                     IB_QP_ACCESS_FLAGS           |
                                     IB_QP_PATH_MIG_STATE),
                         [IB_QPT_RC]  = (IB_QP_CUR_STATE          |
                                     IB_QP_ALT_PATH               |
                                     IB_QP_ACCESS_FLAGS           |
                                     IB_QP_MIN_RNR_TIMER          |
                                     IB_QP_PATH_MIG_STATE),
                         [IB_QPT_SMI] = (IB_QP_CUR_STATE          |
                                     IB_QP_QKEY),
                         [IB_QPT_GSI] = (IB_QP_CUR_STATE          |
                                     IB_QP_QKEY),
                   }
            }
      },
      [IB_QPS_RTS]   = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR] =   { .valid = 1 },
            [IB_QPS_RTS]   = {
                  .valid = 1,
                  .opt_param = {
                        [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                        [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_ACCESS_FLAGS            |
                                    IB_QP_ALT_PATH                |
                                    IB_QP_PATH_MIG_STATE),
                        [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_ACCESS_FLAGS            |
                                    IB_QP_ALT_PATH                |
                                    IB_QP_PATH_MIG_STATE          |
                                    IB_QP_MIN_RNR_TIMER),
                        [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                        [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                  }
            },
            [IB_QPS_SQD]   = {
                  .valid = 1,
                  .opt_param = {
                        [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
                        [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
                        [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
                        [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
                        [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
                  }
            },
      },
      [IB_QPS_SQD]   = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR] =   { .valid = 1 },
            [IB_QPS_RTS]   = {
                  .valid = 1,
                  .opt_param = {
                        [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                        [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_ALT_PATH                |
                                    IB_QP_ACCESS_FLAGS            |
                                    IB_QP_PATH_MIG_STATE),
                        [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_ALT_PATH                |
                                    IB_QP_ACCESS_FLAGS            |
                                    IB_QP_MIN_RNR_TIMER           |
                                    IB_QP_PATH_MIG_STATE),
                        [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                        [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                  }
            },
            [IB_QPS_SQD]   = {
                  .valid = 1,
                  .opt_param = {
                        [IB_QPT_UD]  = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                        [IB_QPT_UC]  = (IB_QP_AV                  |
                                    IB_QP_ALT_PATH                |
                                    IB_QP_ACCESS_FLAGS            |
                                    IB_QP_PKEY_INDEX        |
                                    IB_QP_PATH_MIG_STATE),
                        [IB_QPT_RC]  = (IB_QP_PORT                |
                                    IB_QP_AV                |
                                    IB_QP_TIMEOUT                 |
                                    IB_QP_RETRY_CNT               |
                                    IB_QP_RNR_RETRY               |
                                    IB_QP_MAX_QP_RD_ATOMIC        |
                                    IB_QP_MAX_DEST_RD_ATOMIC      |
                                    IB_QP_ALT_PATH                |
                                    IB_QP_ACCESS_FLAGS            |
                                    IB_QP_PKEY_INDEX        |
                                    IB_QP_MIN_RNR_TIMER           |
                                    IB_QP_PATH_MIG_STATE),
                        [IB_QPT_SMI] = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                        [IB_QPT_GSI] = (IB_QP_PKEY_INDEX          |
                                    IB_QP_QKEY),
                  }
            }
      },
      [IB_QPS_SQE]   = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR] =   { .valid = 1 },
            [IB_QPS_RTS]   = {
                  .valid = 1,
                  .opt_param = {
                        [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                        [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
                                    IB_QP_ACCESS_FLAGS),
                        [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                        [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
                                    IB_QP_QKEY),
                  }
            }
      },
      [IB_QPS_ERR] = {
            [IB_QPS_RESET] = { .valid = 1 },
            [IB_QPS_ERR] =   { .valid = 1 }
      }
};

int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
                   enum ib_qp_type type, enum ib_qp_attr_mask mask)
{
      enum ib_qp_attr_mask req_param, opt_param;

      if (cur_state  < 0 || cur_state  > IB_QPS_ERR ||
          next_state < 0 || next_state > IB_QPS_ERR)
            return 0;

      if (mask & IB_QP_CUR_STATE  &&
          cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
          cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
            return 0;

      if (!qp_state_table[cur_state][next_state].valid)
            return 0;

      req_param = qp_state_table[cur_state][next_state].req_param[type];
      opt_param = qp_state_table[cur_state][next_state].opt_param[type];

      if ((mask & req_param) != req_param)
            return 0;

      if (mask & ~(req_param | opt_param | IB_QP_STATE))
            return 0;

      return 1;
}
EXPORT_SYMBOL(ib_modify_qp_is_ok);

int ib_modify_qp(struct ib_qp *qp,
             struct ib_qp_attr *qp_attr,
             int qp_attr_mask)
{
      return qp->device->modify_qp(qp, qp_attr, qp_attr_mask, NULL);
}
EXPORT_SYMBOL(ib_modify_qp);

int ib_query_qp(struct ib_qp *qp,
            struct ib_qp_attr *qp_attr,
            int qp_attr_mask,
            struct ib_qp_init_attr *qp_init_attr)
{
      return qp->device->query_qp ?
            qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
            -ENOSYS;
}
EXPORT_SYMBOL(ib_query_qp);

int ib_destroy_qp(struct ib_qp *qp)
{
      struct ib_pd *pd;
      struct ib_cq *scq, *rcq;
      struct ib_srq *srq;
      int ret;

      pd  = qp->pd;
      scq = qp->send_cq;
      rcq = qp->recv_cq;
      srq = qp->srq;

      ret = qp->device->destroy_qp(qp);
      if (!ret) {
            atomic_dec(&pd->usecnt);
            atomic_dec(&scq->usecnt);
            atomic_dec(&rcq->usecnt);
            if (srq)
                  atomic_dec(&srq->usecnt);
      }

      return ret;
}
EXPORT_SYMBOL(ib_destroy_qp);

/* Completion queues */

struct ib_cq *ib_create_cq(struct ib_device *device,
                     ib_comp_handler comp_handler,
                     void (*event_handler)(struct ib_event *, void *),
                     void *cq_context, int cqe, int comp_vector)
{
      struct ib_cq *cq;

      cq = device->create_cq(device, cqe, comp_vector, NULL, NULL);

      if (!IS_ERR(cq)) {
            cq->device        = device;
            cq->uobject       = NULL;
            cq->comp_handler  = comp_handler;
            cq->event_handler = event_handler;
            cq->cq_context    = cq_context;
            atomic_set(&cq->usecnt, 0);
      }

      return cq;
}
EXPORT_SYMBOL(ib_create_cq);

int ib_destroy_cq(struct ib_cq *cq)
{
      if (atomic_read(&cq->usecnt))
            return -EBUSY;

      return cq->device->destroy_cq(cq);
}
EXPORT_SYMBOL(ib_destroy_cq);

int ib_resize_cq(struct ib_cq *cq, int cqe)
{
      return cq->device->resize_cq ?
            cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS;
}
EXPORT_SYMBOL(ib_resize_cq);

/* Memory regions */

struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
{
      struct ib_mr *mr;

      mr = pd->device->get_dma_mr(pd, mr_access_flags);

      if (!IS_ERR(mr)) {
            mr->device  = pd->device;
            mr->pd      = pd;
            mr->uobject = NULL;
            atomic_inc(&pd->usecnt);
            atomic_set(&mr->usecnt, 0);
      }

      return mr;
}
EXPORT_SYMBOL(ib_get_dma_mr);

struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
                       struct ib_phys_buf *phys_buf_array,
                       int num_phys_buf,
                       int mr_access_flags,
                       u64 *iova_start)
{
      struct ib_mr *mr;

      mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
                             mr_access_flags, iova_start);

      if (!IS_ERR(mr)) {
            mr->device  = pd->device;
            mr->pd      = pd;
            mr->uobject = NULL;
            atomic_inc(&pd->usecnt);
            atomic_set(&mr->usecnt, 0);
      }

      return mr;
}
EXPORT_SYMBOL(ib_reg_phys_mr);

int ib_rereg_phys_mr(struct ib_mr *mr,
                 int mr_rereg_mask,
                 struct ib_pd *pd,
                 struct ib_phys_buf *phys_buf_array,
                 int num_phys_buf,
                 int mr_access_flags,
                 u64 *iova_start)
{
      struct ib_pd *old_pd;
      int ret;

      if (!mr->device->rereg_phys_mr)
            return -ENOSYS;

      if (atomic_read(&mr->usecnt))
            return -EBUSY;

      old_pd = mr->pd;

      ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
                              phys_buf_array, num_phys_buf,
                              mr_access_flags, iova_start);

      if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
            atomic_dec(&old_pd->usecnt);
            atomic_inc(&pd->usecnt);
      }

      return ret;
}
EXPORT_SYMBOL(ib_rereg_phys_mr);

int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
{
      return mr->device->query_mr ?
            mr->device->query_mr(mr, mr_attr) : -ENOSYS;
}
EXPORT_SYMBOL(ib_query_mr);

int ib_dereg_mr(struct ib_mr *mr)
{
      struct ib_pd *pd;
      int ret;

      if (atomic_read(&mr->usecnt))
            return -EBUSY;

      pd = mr->pd;
      ret = mr->device->dereg_mr(mr);
      if (!ret)
            atomic_dec(&pd->usecnt);

      return ret;
}
EXPORT_SYMBOL(ib_dereg_mr);

/* Memory windows */

struct ib_mw *ib_alloc_mw(struct ib_pd *pd)
{
      struct ib_mw *mw;

      if (!pd->device->alloc_mw)
            return ERR_PTR(-ENOSYS);

      mw = pd->device->alloc_mw(pd);
      if (!IS_ERR(mw)) {
            mw->device  = pd->device;
            mw->pd      = pd;
            mw->uobject = NULL;
            atomic_inc(&pd->usecnt);
      }

      return mw;
}
EXPORT_SYMBOL(ib_alloc_mw);

int ib_dealloc_mw(struct ib_mw *mw)
{
      struct ib_pd *pd;
      int ret;

      pd = mw->pd;
      ret = mw->device->dealloc_mw(mw);
      if (!ret)
            atomic_dec(&pd->usecnt);

      return ret;
}
EXPORT_SYMBOL(ib_dealloc_mw);

/* "Fast" memory regions */

struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
                      int mr_access_flags,
                      struct ib_fmr_attr *fmr_attr)
{
      struct ib_fmr *fmr;

      if (!pd->device->alloc_fmr)
            return ERR_PTR(-ENOSYS);

      fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
      if (!IS_ERR(fmr)) {
            fmr->device = pd->device;
            fmr->pd     = pd;
            atomic_inc(&pd->usecnt);
      }

      return fmr;
}
EXPORT_SYMBOL(ib_alloc_fmr);

int ib_unmap_fmr(struct list_head *fmr_list)
{
      struct ib_fmr *fmr;

      if (list_empty(fmr_list))
            return 0;

      fmr = list_entry(fmr_list->next, struct ib_fmr, list);
      return fmr->device->unmap_fmr(fmr_list);
}
EXPORT_SYMBOL(ib_unmap_fmr);

int ib_dealloc_fmr(struct ib_fmr *fmr)
{
      struct ib_pd *pd;
      int ret;

      pd = fmr->pd;
      ret = fmr->device->dealloc_fmr(fmr);
      if (!ret)
            atomic_dec(&pd->usecnt);

      return ret;
}
EXPORT_SYMBOL(ib_dealloc_fmr);

/* Multicast groups */

int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
{
      if (!qp->device->attach_mcast)
            return -ENOSYS;
      if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
            return -EINVAL;

      return qp->device->attach_mcast(qp, gid, lid);
}
EXPORT_SYMBOL(ib_attach_mcast);

int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
{
      if (!qp->device->detach_mcast)
            return -ENOSYS;
      if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
            return -EINVAL;

      return qp->device->detach_mcast(qp, gid, lid);
}
EXPORT_SYMBOL(ib_detach_mcast);

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