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mthca_provider.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004 Voltaire, Inc. 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: mthca_provider.c 4859 2006-01-09 21:55:10Z roland $
 */

#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>
#include <linux/mm.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"
#include "mthca_user.h"
#include "mthca_memfree.h"

static void init_query_mad(struct ib_smp *mad)
{
      mad->base_version  = 1;
      mad->mgmt_class    = IB_MGMT_CLASS_SUBN_LID_ROUTED;
      mad->class_version = 1;
      mad->method          = IB_MGMT_METHOD_GET;
}

static int mthca_query_device(struct ib_device *ibdev,
                        struct ib_device_attr *props)
{
      struct ib_smp *in_mad  = NULL;
      struct ib_smp *out_mad = NULL;
      int err = -ENOMEM;
      struct mthca_dev* mdev = to_mdev(ibdev);

      u8 status;

      in_mad  = kzalloc(sizeof *in_mad, GFP_KERNEL);
      out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
      if (!in_mad || !out_mad)
            goto out;

      memset(props, 0, sizeof *props);

      props->fw_ver              = mdev->fw_ver;

      init_query_mad(in_mad);
      in_mad->attr_id = IB_SMP_ATTR_NODE_INFO;

      err = mthca_MAD_IFC(mdev, 1, 1,
                      1, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      props->device_cap_flags    = mdev->device_cap_flags;
      props->vendor_id           = be32_to_cpup((__be32 *) (out_mad->data + 36)) &
            0xffffff;
      props->vendor_part_id      = be16_to_cpup((__be16 *) (out_mad->data + 30));
      props->hw_ver              = be32_to_cpup((__be32 *) (out_mad->data + 32));
      memcpy(&props->sys_image_guid, out_mad->data +  4, 8);

      props->max_mr_size         = ~0ull;
      props->page_size_cap       = mdev->limits.page_size_cap;
      props->max_qp              = mdev->limits.num_qps - mdev->limits.reserved_qps;
      props->max_qp_wr           = mdev->limits.max_wqes;
      props->max_sge             = mdev->limits.max_sg;
      props->max_cq              = mdev->limits.num_cqs - mdev->limits.reserved_cqs;
      props->max_cqe             = mdev->limits.max_cqes;
      props->max_mr              = mdev->limits.num_mpts - mdev->limits.reserved_mrws;
      props->max_pd              = mdev->limits.num_pds - mdev->limits.reserved_pds;
      props->max_qp_rd_atom      = 1 << mdev->qp_table.rdb_shift;
      props->max_qp_init_rd_atom = mdev->limits.max_qp_init_rdma;
      props->max_res_rd_atom     = props->max_qp_rd_atom * props->max_qp;
      props->max_srq             = mdev->limits.num_srqs - mdev->limits.reserved_srqs;
      props->max_srq_wr          = mdev->limits.max_srq_wqes;
      props->max_srq_sge         = mdev->limits.max_srq_sge;
      props->local_ca_ack_delay  = mdev->limits.local_ca_ack_delay;
      props->atomic_cap          = mdev->limits.flags & DEV_LIM_FLAG_ATOMIC ?
                              IB_ATOMIC_HCA : IB_ATOMIC_NONE;
      props->max_pkeys           = mdev->limits.pkey_table_len;
      props->max_mcast_grp       = mdev->limits.num_mgms + mdev->limits.num_amgms;
      props->max_mcast_qp_attach = MTHCA_QP_PER_MGM;
      props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
                                 props->max_mcast_grp;
      /*
       * If Sinai memory key optimization is being used, then only
       * the 8-bit key portion will change.  For other HCAs, the
       * unused index bits will also be used for FMR remapping.
       */
      if (mdev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
            props->max_map_per_fmr = 255;
      else
            props->max_map_per_fmr =
                  (1 << (32 - ilog2(mdev->limits.num_mpts))) - 1;

      err = 0;
 out:
      kfree(in_mad);
      kfree(out_mad);
      return err;
}

static int mthca_query_port(struct ib_device *ibdev,
                      u8 port, struct ib_port_attr *props)
{
      struct ib_smp *in_mad  = NULL;
      struct ib_smp *out_mad = NULL;
      int err = -ENOMEM;
      u8 status;

      in_mad  = kzalloc(sizeof *in_mad, GFP_KERNEL);
      out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
      if (!in_mad || !out_mad)
            goto out;

      memset(props, 0, sizeof *props);

      init_query_mad(in_mad);
      in_mad->attr_id  = IB_SMP_ATTR_PORT_INFO;
      in_mad->attr_mod = cpu_to_be32(port);

      err = mthca_MAD_IFC(to_mdev(ibdev), 1, 1,
                      port, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      props->lid               = be16_to_cpup((__be16 *) (out_mad->data + 16));
      props->lmc               = out_mad->data[34] & 0x7;
      props->sm_lid            = be16_to_cpup((__be16 *) (out_mad->data + 18));
      props->sm_sl             = out_mad->data[36] & 0xf;
      props->state             = out_mad->data[32] & 0xf;
      props->phys_state        = out_mad->data[33] >> 4;
      props->port_cap_flags    = be32_to_cpup((__be32 *) (out_mad->data + 20));
      props->gid_tbl_len       = to_mdev(ibdev)->limits.gid_table_len;
      props->max_msg_sz        = 0x80000000;
      props->pkey_tbl_len      = to_mdev(ibdev)->limits.pkey_table_len;
      props->bad_pkey_cntr     = be16_to_cpup((__be16 *) (out_mad->data + 46));
      props->qkey_viol_cntr    = be16_to_cpup((__be16 *) (out_mad->data + 48));
      props->active_width      = out_mad->data[31] & 0xf;
      props->active_speed      = out_mad->data[35] >> 4;
      props->max_mtu           = out_mad->data[41] & 0xf;
      props->active_mtu        = out_mad->data[36] >> 4;
      props->subnet_timeout    = out_mad->data[51] & 0x1f;
      props->max_vl_num        = out_mad->data[37] >> 4;
      props->init_type_reply   = out_mad->data[41] >> 4;

 out:
      kfree(in_mad);
      kfree(out_mad);
      return err;
}

static int mthca_modify_device(struct ib_device *ibdev,
                         int mask,
                         struct ib_device_modify *props)
{
      if (mask & ~IB_DEVICE_MODIFY_NODE_DESC)
            return -EOPNOTSUPP;

      if (mask & IB_DEVICE_MODIFY_NODE_DESC) {
            if (mutex_lock_interruptible(&to_mdev(ibdev)->cap_mask_mutex))
                  return -ERESTARTSYS;
            memcpy(ibdev->node_desc, props->node_desc, 64);
            mutex_unlock(&to_mdev(ibdev)->cap_mask_mutex);
      }

      return 0;
}

static int mthca_modify_port(struct ib_device *ibdev,
                       u8 port, int port_modify_mask,
                       struct ib_port_modify *props)
{
      struct mthca_set_ib_param set_ib;
      struct ib_port_attr attr;
      int err;
      u8 status;

      if (mutex_lock_interruptible(&to_mdev(ibdev)->cap_mask_mutex))
            return -ERESTARTSYS;

      err = mthca_query_port(ibdev, port, &attr);
      if (err)
            goto out;

      set_ib.set_si_guid     = 0;
      set_ib.reset_qkey_viol = !!(port_modify_mask & IB_PORT_RESET_QKEY_CNTR);

      set_ib.cap_mask = (attr.port_cap_flags | props->set_port_cap_mask) &
            ~props->clr_port_cap_mask;

      err = mthca_SET_IB(to_mdev(ibdev), &set_ib, port, &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

out:
      mutex_unlock(&to_mdev(ibdev)->cap_mask_mutex);
      return err;
}

static int mthca_query_pkey(struct ib_device *ibdev,
                      u8 port, u16 index, u16 *pkey)
{
      struct ib_smp *in_mad  = NULL;
      struct ib_smp *out_mad = NULL;
      int err = -ENOMEM;
      u8 status;

      in_mad  = kzalloc(sizeof *in_mad, GFP_KERNEL);
      out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
      if (!in_mad || !out_mad)
            goto out;

      init_query_mad(in_mad);
      in_mad->attr_id  = IB_SMP_ATTR_PKEY_TABLE;
      in_mad->attr_mod = cpu_to_be32(index / 32);

      err = mthca_MAD_IFC(to_mdev(ibdev), 1, 1,
                      port, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      *pkey = be16_to_cpu(((__be16 *) out_mad->data)[index % 32]);

 out:
      kfree(in_mad);
      kfree(out_mad);
      return err;
}

static int mthca_query_gid(struct ib_device *ibdev, u8 port,
                     int index, union ib_gid *gid)
{
      struct ib_smp *in_mad  = NULL;
      struct ib_smp *out_mad = NULL;
      int err = -ENOMEM;
      u8 status;

      in_mad  = kzalloc(sizeof *in_mad, GFP_KERNEL);
      out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
      if (!in_mad || !out_mad)
            goto out;

      init_query_mad(in_mad);
      in_mad->attr_id  = IB_SMP_ATTR_PORT_INFO;
      in_mad->attr_mod = cpu_to_be32(port);

      err = mthca_MAD_IFC(to_mdev(ibdev), 1, 1,
                      port, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      memcpy(gid->raw, out_mad->data + 8, 8);

      init_query_mad(in_mad);
      in_mad->attr_id  = IB_SMP_ATTR_GUID_INFO;
      in_mad->attr_mod = cpu_to_be32(index / 8);

      err = mthca_MAD_IFC(to_mdev(ibdev), 1, 1,
                      port, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      memcpy(gid->raw + 8, out_mad->data + (index % 8) * 8, 8);

 out:
      kfree(in_mad);
      kfree(out_mad);
      return err;
}

static struct ib_ucontext *mthca_alloc_ucontext(struct ib_device *ibdev,
                                    struct ib_udata *udata)
{
      struct mthca_alloc_ucontext_resp uresp;
      struct mthca_ucontext           *context;
      int                              err;

      memset(&uresp, 0, sizeof uresp);

      uresp.qp_tab_size = to_mdev(ibdev)->limits.num_qps;
      if (mthca_is_memfree(to_mdev(ibdev)))
            uresp.uarc_size = to_mdev(ibdev)->uar_table.uarc_size;
      else
            uresp.uarc_size = 0;

      context = kmalloc(sizeof *context, GFP_KERNEL);
      if (!context)
            return ERR_PTR(-ENOMEM);

      err = mthca_uar_alloc(to_mdev(ibdev), &context->uar);
      if (err) {
            kfree(context);
            return ERR_PTR(err);
      }

      context->db_tab = mthca_init_user_db_tab(to_mdev(ibdev));
      if (IS_ERR(context->db_tab)) {
            err = PTR_ERR(context->db_tab);
            mthca_uar_free(to_mdev(ibdev), &context->uar);
            kfree(context);
            return ERR_PTR(err);
      }

      if (ib_copy_to_udata(udata, &uresp, sizeof uresp)) {
            mthca_cleanup_user_db_tab(to_mdev(ibdev), &context->uar, context->db_tab);
            mthca_uar_free(to_mdev(ibdev), &context->uar);
            kfree(context);
            return ERR_PTR(-EFAULT);
      }

      return &context->ibucontext;
}

static int mthca_dealloc_ucontext(struct ib_ucontext *context)
{
      mthca_cleanup_user_db_tab(to_mdev(context->device), &to_mucontext(context)->uar,
                          to_mucontext(context)->db_tab);
      mthca_uar_free(to_mdev(context->device), &to_mucontext(context)->uar);
      kfree(to_mucontext(context));

      return 0;
}

static int mthca_mmap_uar(struct ib_ucontext *context,
                    struct vm_area_struct *vma)
{
      if (vma->vm_end - vma->vm_start != PAGE_SIZE)
            return -EINVAL;

      vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

      if (io_remap_pfn_range(vma, vma->vm_start,
                         to_mucontext(context)->uar.pfn,
                         PAGE_SIZE, vma->vm_page_prot))
            return -EAGAIN;

      return 0;
}

static struct ib_pd *mthca_alloc_pd(struct ib_device *ibdev,
                            struct ib_ucontext *context,
                            struct ib_udata *udata)
{
      struct mthca_pd *pd;
      int err;

      pd = kmalloc(sizeof *pd, GFP_KERNEL);
      if (!pd)
            return ERR_PTR(-ENOMEM);

      err = mthca_pd_alloc(to_mdev(ibdev), !context, pd);
      if (err) {
            kfree(pd);
            return ERR_PTR(err);
      }

      if (context) {
            if (ib_copy_to_udata(udata, &pd->pd_num, sizeof (__u32))) {
                  mthca_pd_free(to_mdev(ibdev), pd);
                  kfree(pd);
                  return ERR_PTR(-EFAULT);
            }
      }

      return &pd->ibpd;
}

static int mthca_dealloc_pd(struct ib_pd *pd)
{
      mthca_pd_free(to_mdev(pd->device), to_mpd(pd));
      kfree(pd);

      return 0;
}

static struct ib_ah *mthca_ah_create(struct ib_pd *pd,
                             struct ib_ah_attr *ah_attr)
{
      int err;
      struct mthca_ah *ah;

      ah = kmalloc(sizeof *ah, GFP_ATOMIC);
      if (!ah)
            return ERR_PTR(-ENOMEM);

      err = mthca_create_ah(to_mdev(pd->device), to_mpd(pd), ah_attr, ah);
      if (err) {
            kfree(ah);
            return ERR_PTR(err);
      }

      return &ah->ibah;
}

static int mthca_ah_destroy(struct ib_ah *ah)
{
      mthca_destroy_ah(to_mdev(ah->device), to_mah(ah));
      kfree(ah);

      return 0;
}

static struct ib_srq *mthca_create_srq(struct ib_pd *pd,
                               struct ib_srq_init_attr *init_attr,
                               struct ib_udata *udata)
{
      struct mthca_create_srq ucmd;
      struct mthca_ucontext *context = NULL;
      struct mthca_srq *srq;
      int err;

      srq = kmalloc(sizeof *srq, GFP_KERNEL);
      if (!srq)
            return ERR_PTR(-ENOMEM);

      if (pd->uobject) {
            context = to_mucontext(pd->uobject->context);

            if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
                  err = -EFAULT;
                  goto err_free;
            }

            err = mthca_map_user_db(to_mdev(pd->device), &context->uar,
                              context->db_tab, ucmd.db_index,
                              ucmd.db_page);

            if (err)
                  goto err_free;

            srq->mr.ibmr.lkey = ucmd.lkey;
            srq->db_index     = ucmd.db_index;
      }

      err = mthca_alloc_srq(to_mdev(pd->device), to_mpd(pd),
                        &init_attr->attr, srq);

      if (err && pd->uobject)
            mthca_unmap_user_db(to_mdev(pd->device), &context->uar,
                            context->db_tab, ucmd.db_index);

      if (err)
            goto err_free;

      if (context && ib_copy_to_udata(udata, &srq->srqn, sizeof (__u32))) {
            mthca_free_srq(to_mdev(pd->device), srq);
            err = -EFAULT;
            goto err_free;
      }

      return &srq->ibsrq;

err_free:
      kfree(srq);

      return ERR_PTR(err);
}

static int mthca_destroy_srq(struct ib_srq *srq)
{
      struct mthca_ucontext *context;

      if (srq->uobject) {
            context = to_mucontext(srq->uobject->context);

            mthca_unmap_user_db(to_mdev(srq->device), &context->uar,
                            context->db_tab, to_msrq(srq)->db_index);
      }

      mthca_free_srq(to_mdev(srq->device), to_msrq(srq));
      kfree(srq);

      return 0;
}

static struct ib_qp *mthca_create_qp(struct ib_pd *pd,
                             struct ib_qp_init_attr *init_attr,
                             struct ib_udata *udata)
{
      struct mthca_create_qp ucmd;
      struct mthca_qp *qp;
      int err;

      switch (init_attr->qp_type) {
      case IB_QPT_RC:
      case IB_QPT_UC:
      case IB_QPT_UD:
      {
            struct mthca_ucontext *context;

            qp = kmalloc(sizeof *qp, GFP_KERNEL);
            if (!qp)
                  return ERR_PTR(-ENOMEM);

            if (pd->uobject) {
                  context = to_mucontext(pd->uobject->context);

                  if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
                        kfree(qp);
                        return ERR_PTR(-EFAULT);
                  }

                  err = mthca_map_user_db(to_mdev(pd->device), &context->uar,
                                    context->db_tab,
                                    ucmd.sq_db_index, ucmd.sq_db_page);
                  if (err) {
                        kfree(qp);
                        return ERR_PTR(err);
                  }

                  err = mthca_map_user_db(to_mdev(pd->device), &context->uar,
                                    context->db_tab,
                                    ucmd.rq_db_index, ucmd.rq_db_page);
                  if (err) {
                        mthca_unmap_user_db(to_mdev(pd->device),
                                        &context->uar,
                                        context->db_tab,
                                        ucmd.sq_db_index);
                        kfree(qp);
                        return ERR_PTR(err);
                  }

                  qp->mr.ibmr.lkey = ucmd.lkey;
                  qp->sq.db_index  = ucmd.sq_db_index;
                  qp->rq.db_index  = ucmd.rq_db_index;
            }

            err = mthca_alloc_qp(to_mdev(pd->device), to_mpd(pd),
                             to_mcq(init_attr->send_cq),
                             to_mcq(init_attr->recv_cq),
                             init_attr->qp_type, init_attr->sq_sig_type,
                             &init_attr->cap, qp);

            if (err && pd->uobject) {
                  context = to_mucontext(pd->uobject->context);

                  mthca_unmap_user_db(to_mdev(pd->device),
                                  &context->uar,
                                  context->db_tab,
                                  ucmd.sq_db_index);
                  mthca_unmap_user_db(to_mdev(pd->device),
                                  &context->uar,
                                  context->db_tab,
                                  ucmd.rq_db_index);
            }

            qp->ibqp.qp_num = qp->qpn;
            break;
      }
      case IB_QPT_SMI:
      case IB_QPT_GSI:
      {
            /* Don't allow userspace to create special QPs */
            if (pd->uobject)
                  return ERR_PTR(-EINVAL);

            qp = kmalloc(sizeof (struct mthca_sqp), GFP_KERNEL);
            if (!qp)
                  return ERR_PTR(-ENOMEM);

            qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;

            err = mthca_alloc_sqp(to_mdev(pd->device), to_mpd(pd),
                              to_mcq(init_attr->send_cq),
                              to_mcq(init_attr->recv_cq),
                              init_attr->sq_sig_type, &init_attr->cap,
                              qp->ibqp.qp_num, init_attr->port_num,
                              to_msqp(qp));
            break;
      }
      default:
            /* Don't support raw QPs */
            return ERR_PTR(-ENOSYS);
      }

      if (err) {
            kfree(qp);
            return ERR_PTR(err);
      }

      init_attr->cap.max_send_wr     = qp->sq.max;
      init_attr->cap.max_recv_wr     = qp->rq.max;
      init_attr->cap.max_send_sge    = qp->sq.max_gs;
      init_attr->cap.max_recv_sge    = qp->rq.max_gs;
      init_attr->cap.max_inline_data = qp->max_inline_data;

      return &qp->ibqp;
}

static int mthca_destroy_qp(struct ib_qp *qp)
{
      if (qp->uobject) {
            mthca_unmap_user_db(to_mdev(qp->device),
                            &to_mucontext(qp->uobject->context)->uar,
                            to_mucontext(qp->uobject->context)->db_tab,
                            to_mqp(qp)->sq.db_index);
            mthca_unmap_user_db(to_mdev(qp->device),
                            &to_mucontext(qp->uobject->context)->uar,
                            to_mucontext(qp->uobject->context)->db_tab,
                            to_mqp(qp)->rq.db_index);
      }
      mthca_free_qp(to_mdev(qp->device), to_mqp(qp));
      kfree(qp);
      return 0;
}

static struct ib_cq *mthca_create_cq(struct ib_device *ibdev, int entries,
                             int comp_vector,
                             struct ib_ucontext *context,
                             struct ib_udata *udata)
{
      struct mthca_create_cq ucmd;
      struct mthca_cq *cq;
      int nent;
      int err;

      if (entries < 1 || entries > to_mdev(ibdev)->limits.max_cqes)
            return ERR_PTR(-EINVAL);

      if (context) {
            if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
                  return ERR_PTR(-EFAULT);

            err = mthca_map_user_db(to_mdev(ibdev), &to_mucontext(context)->uar,
                              to_mucontext(context)->db_tab,
                              ucmd.set_db_index, ucmd.set_db_page);
            if (err)
                  return ERR_PTR(err);

            err = mthca_map_user_db(to_mdev(ibdev), &to_mucontext(context)->uar,
                              to_mucontext(context)->db_tab,
                              ucmd.arm_db_index, ucmd.arm_db_page);
            if (err)
                  goto err_unmap_set;
      }

      cq = kmalloc(sizeof *cq, GFP_KERNEL);
      if (!cq) {
            err = -ENOMEM;
            goto err_unmap_arm;
      }

      if (context) {
            cq->buf.mr.ibmr.lkey = ucmd.lkey;
            cq->set_ci_db_index  = ucmd.set_db_index;
            cq->arm_db_index     = ucmd.arm_db_index;
      }

      for (nent = 1; nent <= entries; nent <<= 1)
            ; /* nothing */

      err = mthca_init_cq(to_mdev(ibdev), nent,
                      context ? to_mucontext(context) : NULL,
                      context ? ucmd.pdn : to_mdev(ibdev)->driver_pd.pd_num,
                      cq);
      if (err)
            goto err_free;

      if (context && ib_copy_to_udata(udata, &cq->cqn, sizeof (__u32))) {
            mthca_free_cq(to_mdev(ibdev), cq);
            goto err_free;
      }

      cq->resize_buf = NULL;

      return &cq->ibcq;

err_free:
      kfree(cq);

err_unmap_arm:
      if (context)
            mthca_unmap_user_db(to_mdev(ibdev), &to_mucontext(context)->uar,
                            to_mucontext(context)->db_tab, ucmd.arm_db_index);

err_unmap_set:
      if (context)
            mthca_unmap_user_db(to_mdev(ibdev), &to_mucontext(context)->uar,
                            to_mucontext(context)->db_tab, ucmd.set_db_index);

      return ERR_PTR(err);
}

static int mthca_alloc_resize_buf(struct mthca_dev *dev, struct mthca_cq *cq,
                          int entries)
{
      int ret;

      spin_lock_irq(&cq->lock);
      if (cq->resize_buf) {
            ret = -EBUSY;
            goto unlock;
      }

      cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
      if (!cq->resize_buf) {
            ret = -ENOMEM;
            goto unlock;
      }

      cq->resize_buf->state = CQ_RESIZE_ALLOC;

      ret = 0;

unlock:
      spin_unlock_irq(&cq->lock);

      if (ret)
            return ret;

      ret = mthca_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
      if (ret) {
            spin_lock_irq(&cq->lock);
            kfree(cq->resize_buf);
            cq->resize_buf = NULL;
            spin_unlock_irq(&cq->lock);
            return ret;
      }

      cq->resize_buf->cqe = entries - 1;

      spin_lock_irq(&cq->lock);
      cq->resize_buf->state = CQ_RESIZE_READY;
      spin_unlock_irq(&cq->lock);

      return 0;
}

static int mthca_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
{
      struct mthca_dev *dev = to_mdev(ibcq->device);
      struct mthca_cq *cq = to_mcq(ibcq);
      struct mthca_resize_cq ucmd;
      u32 lkey;
      u8 status;
      int ret;

      if (entries < 1 || entries > dev->limits.max_cqes)
            return -EINVAL;

      mutex_lock(&cq->mutex);

      entries = roundup_pow_of_two(entries + 1);
      if (entries == ibcq->cqe + 1) {
            ret = 0;
            goto out;
      }

      if (cq->is_kernel) {
            ret = mthca_alloc_resize_buf(dev, cq, entries);
            if (ret)
                  goto out;
            lkey = cq->resize_buf->buf.mr.ibmr.lkey;
      } else {
            if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
                  ret = -EFAULT;
                  goto out;
            }
            lkey = ucmd.lkey;
      }

      ret = mthca_RESIZE_CQ(dev, cq->cqn, lkey, ilog2(entries), &status);
      if (status)
            ret = -EINVAL;

      if (ret) {
            if (cq->resize_buf) {
                  mthca_free_cq_buf(dev, &cq->resize_buf->buf,
                                cq->resize_buf->cqe);
                  kfree(cq->resize_buf);
                  spin_lock_irq(&cq->lock);
                  cq->resize_buf = NULL;
                  spin_unlock_irq(&cq->lock);
            }
            goto out;
      }

      if (cq->is_kernel) {
            struct mthca_cq_buf tbuf;
            int tcqe;

            spin_lock_irq(&cq->lock);
            if (cq->resize_buf->state == CQ_RESIZE_READY) {
                  mthca_cq_resize_copy_cqes(cq);
                  tbuf         = cq->buf;
                  tcqe         = cq->ibcq.cqe;
                  cq->buf      = cq->resize_buf->buf;
                  cq->ibcq.cqe = cq->resize_buf->cqe;
            } else {
                  tbuf = cq->resize_buf->buf;
                  tcqe = cq->resize_buf->cqe;
            }

            kfree(cq->resize_buf);
            cq->resize_buf = NULL;
            spin_unlock_irq(&cq->lock);

            mthca_free_cq_buf(dev, &tbuf, tcqe);
      } else
            ibcq->cqe = entries - 1;

out:
      mutex_unlock(&cq->mutex);

      return ret;
}

static int mthca_destroy_cq(struct ib_cq *cq)
{
      if (cq->uobject) {
            mthca_unmap_user_db(to_mdev(cq->device),
                            &to_mucontext(cq->uobject->context)->uar,
                            to_mucontext(cq->uobject->context)->db_tab,
                            to_mcq(cq)->arm_db_index);
            mthca_unmap_user_db(to_mdev(cq->device),
                            &to_mucontext(cq->uobject->context)->uar,
                            to_mucontext(cq->uobject->context)->db_tab,
                            to_mcq(cq)->set_ci_db_index);
      }
      mthca_free_cq(to_mdev(cq->device), to_mcq(cq));
      kfree(cq);

      return 0;
}

static inline u32 convert_access(int acc)
{
      return (acc & IB_ACCESS_REMOTE_ATOMIC ? MTHCA_MPT_FLAG_ATOMIC       : 0) |
             (acc & IB_ACCESS_REMOTE_WRITE  ? MTHCA_MPT_FLAG_REMOTE_WRITE : 0) |
             (acc & IB_ACCESS_REMOTE_READ   ? MTHCA_MPT_FLAG_REMOTE_READ  : 0) |
             (acc & IB_ACCESS_LOCAL_WRITE   ? MTHCA_MPT_FLAG_LOCAL_WRITE  : 0) |
             MTHCA_MPT_FLAG_LOCAL_READ;
}

static struct ib_mr *mthca_get_dma_mr(struct ib_pd *pd, int acc)
{
      struct mthca_mr *mr;
      int err;

      mr = kmalloc(sizeof *mr, GFP_KERNEL);
      if (!mr)
            return ERR_PTR(-ENOMEM);

      err = mthca_mr_alloc_notrans(to_mdev(pd->device),
                             to_mpd(pd)->pd_num,
                             convert_access(acc), mr);

      if (err) {
            kfree(mr);
            return ERR_PTR(err);
      }

      mr->umem = NULL;

      return &mr->ibmr;
}

static struct ib_mr *mthca_reg_phys_mr(struct ib_pd       *pd,
                               struct ib_phys_buf *buffer_list,
                               int                 num_phys_buf,
                               int                 acc,
                               u64                *iova_start)
{
      struct mthca_mr *mr;
      u64 *page_list;
      u64 total_size;
      u64 mask;
      int shift;
      int npages;
      int err;
      int i, j, n;

      /* First check that we have enough alignment */
      if ((*iova_start & ~PAGE_MASK) != (buffer_list[0].addr & ~PAGE_MASK))
            return ERR_PTR(-EINVAL);

      mask = 0;
      total_size = 0;
      for (i = 0; i < num_phys_buf; ++i) {
            if (i != 0)
                  mask |= buffer_list[i].addr;
            if (i != num_phys_buf - 1)
                  mask |= buffer_list[i].addr + buffer_list[i].size;

            total_size += buffer_list[i].size;
      }

      if (mask & ~PAGE_MASK)
            return ERR_PTR(-EINVAL);

      /* Find largest page shift we can use to cover buffers */
      for (shift = PAGE_SHIFT; shift < 31; ++shift)
            if (num_phys_buf > 1) {
                  if ((1ULL << shift) & mask)
                        break;
            } else {
                  if (1ULL << shift >=
                      buffer_list[0].size +
                      (buffer_list[0].addr & ((1ULL << shift) - 1)))
                        break;
            }

      buffer_list[0].size += buffer_list[0].addr & ((1ULL << shift) - 1);
      buffer_list[0].addr &= ~0ull << shift;

      mr = kmalloc(sizeof *mr, GFP_KERNEL);
      if (!mr)
            return ERR_PTR(-ENOMEM);

      npages = 0;
      for (i = 0; i < num_phys_buf; ++i)
            npages += (buffer_list[i].size + (1ULL << shift) - 1) >> shift;

      if (!npages)
            return &mr->ibmr;

      page_list = kmalloc(npages * sizeof *page_list, GFP_KERNEL);
      if (!page_list) {
            kfree(mr);
            return ERR_PTR(-ENOMEM);
      }

      n = 0;
      for (i = 0; i < num_phys_buf; ++i)
            for (j = 0;
                 j < (buffer_list[i].size + (1ULL << shift) - 1) >> shift;
                 ++j)
                  page_list[n++] = buffer_list[i].addr + ((u64) j << shift);

      mthca_dbg(to_mdev(pd->device), "Registering memory at %llx (iova %llx) "
              "in PD %x; shift %d, npages %d.\n",
              (unsigned long long) buffer_list[0].addr,
              (unsigned long long) *iova_start,
              to_mpd(pd)->pd_num,
              shift, npages);

      err = mthca_mr_alloc_phys(to_mdev(pd->device),
                          to_mpd(pd)->pd_num,
                          page_list, shift, npages,
                          *iova_start, total_size,
                          convert_access(acc), mr);

      if (err) {
            kfree(page_list);
            kfree(mr);
            return ERR_PTR(err);
      }

      kfree(page_list);
      mr->umem = NULL;

      return &mr->ibmr;
}

static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                               u64 virt, int acc, struct ib_udata *udata)
{
      struct mthca_dev *dev = to_mdev(pd->device);
      struct ib_umem_chunk *chunk;
      struct mthca_mr *mr;
      u64 *pages;
      int shift, n, len;
      int i, j, k;
      int err = 0;
      int write_mtt_size;

      mr = kmalloc(sizeof *mr, GFP_KERNEL);
      if (!mr)
            return ERR_PTR(-ENOMEM);

      mr->umem = ib_umem_get(pd->uobject->context, start, length, acc);
      if (IS_ERR(mr->umem)) {
            err = PTR_ERR(mr->umem);
            goto err;
      }

      shift = ffs(mr->umem->page_size) - 1;

      n = 0;
      list_for_each_entry(chunk, &mr->umem->chunk_list, list)
            n += chunk->nents;

      mr->mtt = mthca_alloc_mtt(dev, n);
      if (IS_ERR(mr->mtt)) {
            err = PTR_ERR(mr->mtt);
            goto err_umem;
      }

      pages = (u64 *) __get_free_page(GFP_KERNEL);
      if (!pages) {
            err = -ENOMEM;
            goto err_mtt;
      }

      i = n = 0;

      write_mtt_size = min(mthca_write_mtt_size(dev), (int) (PAGE_SIZE / sizeof *pages));

      list_for_each_entry(chunk, &mr->umem->chunk_list, list)
            for (j = 0; j < chunk->nmap; ++j) {
                  len = sg_dma_len(&chunk->page_list[j]) >> shift;
                  for (k = 0; k < len; ++k) {
                        pages[i++] = sg_dma_address(&chunk->page_list[j]) +
                              mr->umem->page_size * k;
                        /*
                         * Be friendly to write_mtt and pass it chunks
                         * of appropriate size.
                         */
                        if (i == write_mtt_size) {
                              err = mthca_write_mtt(dev, mr->mtt, n, pages, i);
                              if (err)
                                    goto mtt_done;
                              n += i;
                              i = 0;
                        }
                  }
            }

      if (i)
            err = mthca_write_mtt(dev, mr->mtt, n, pages, i);
mtt_done:
      free_page((unsigned long) pages);
      if (err)
            goto err_mtt;

      err = mthca_mr_alloc(dev, to_mpd(pd)->pd_num, shift, virt, length,
                       convert_access(acc), mr);

      if (err)
            goto err_mtt;

      return &mr->ibmr;

err_mtt:
      mthca_free_mtt(dev, mr->mtt);

err_umem:
      ib_umem_release(mr->umem);

err:
      kfree(mr);
      return ERR_PTR(err);
}

static int mthca_dereg_mr(struct ib_mr *mr)
{
      struct mthca_mr *mmr = to_mmr(mr);

      mthca_free_mr(to_mdev(mr->device), mmr);
      if (mmr->umem)
            ib_umem_release(mmr->umem);
      kfree(mmr);

      return 0;
}

static struct ib_fmr *mthca_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
                              struct ib_fmr_attr *fmr_attr)
{
      struct mthca_fmr *fmr;
      int err;

      fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
      if (!fmr)
            return ERR_PTR(-ENOMEM);

      memcpy(&fmr->attr, fmr_attr, sizeof *fmr_attr);
      err = mthca_fmr_alloc(to_mdev(pd->device), to_mpd(pd)->pd_num,
                       convert_access(mr_access_flags), fmr);

      if (err) {
            kfree(fmr);
            return ERR_PTR(err);
      }

      return &fmr->ibmr;
}

static int mthca_dealloc_fmr(struct ib_fmr *fmr)
{
      struct mthca_fmr *mfmr = to_mfmr(fmr);
      int err;

      err = mthca_free_fmr(to_mdev(fmr->device), mfmr);
      if (err)
            return err;

      kfree(mfmr);
      return 0;
}

static int mthca_unmap_fmr(struct list_head *fmr_list)
{
      struct ib_fmr *fmr;
      int err;
      u8 status;
      struct mthca_dev *mdev = NULL;

      list_for_each_entry(fmr, fmr_list, list) {
            if (mdev && to_mdev(fmr->device) != mdev)
                  return -EINVAL;
            mdev = to_mdev(fmr->device);
      }

      if (!mdev)
            return 0;

      if (mthca_is_memfree(mdev)) {
            list_for_each_entry(fmr, fmr_list, list)
                  mthca_arbel_fmr_unmap(mdev, to_mfmr(fmr));

            wmb();
      } else
            list_for_each_entry(fmr, fmr_list, list)
                  mthca_tavor_fmr_unmap(mdev, to_mfmr(fmr));

      err = mthca_SYNC_TPT(mdev, &status);
      if (err)
            return err;
      if (status)
            return -EINVAL;
      return 0;
}

static ssize_t show_rev(struct class_device *cdev, char *buf)
{
      struct mthca_dev *dev = container_of(cdev, struct mthca_dev, ib_dev.class_dev);
      return sprintf(buf, "%x\n", dev->rev_id);
}

static ssize_t show_fw_ver(struct class_device *cdev, char *buf)
{
      struct mthca_dev *dev = container_of(cdev, struct mthca_dev, ib_dev.class_dev);
      return sprintf(buf, "%d.%d.%d\n", (int) (dev->fw_ver >> 32),
                   (int) (dev->fw_ver >> 16) & 0xffff,
                   (int) dev->fw_ver & 0xffff);
}

static ssize_t show_hca(struct class_device *cdev, char *buf)
{
      struct mthca_dev *dev = container_of(cdev, struct mthca_dev, ib_dev.class_dev);
      switch (dev->pdev->device) {
      case PCI_DEVICE_ID_MELLANOX_TAVOR:
            return sprintf(buf, "MT23108\n");
      case PCI_DEVICE_ID_MELLANOX_ARBEL_COMPAT:
            return sprintf(buf, "MT25208 (MT23108 compat mode)\n");
      case PCI_DEVICE_ID_MELLANOX_ARBEL:
            return sprintf(buf, "MT25208\n");
      case PCI_DEVICE_ID_MELLANOX_SINAI:
      case PCI_DEVICE_ID_MELLANOX_SINAI_OLD:
            return sprintf(buf, "MT25204\n");
      default:
            return sprintf(buf, "unknown\n");
      }
}

static ssize_t show_board(struct class_device *cdev, char *buf)
{
      struct mthca_dev *dev = container_of(cdev, struct mthca_dev, ib_dev.class_dev);
      return sprintf(buf, "%.*s\n", MTHCA_BOARD_ID_LEN, dev->board_id);
}

static CLASS_DEVICE_ATTR(hw_rev,   S_IRUGO, show_rev,    NULL);
static CLASS_DEVICE_ATTR(fw_ver,   S_IRUGO, show_fw_ver, NULL);
static CLASS_DEVICE_ATTR(hca_type, S_IRUGO, show_hca,    NULL);
static CLASS_DEVICE_ATTR(board_id, S_IRUGO, show_board,  NULL);

static struct class_device_attribute *mthca_class_attributes[] = {
      &class_device_attr_hw_rev,
      &class_device_attr_fw_ver,
      &class_device_attr_hca_type,
      &class_device_attr_board_id
};

static int mthca_init_node_data(struct mthca_dev *dev)
{
      struct ib_smp *in_mad  = NULL;
      struct ib_smp *out_mad = NULL;
      int err = -ENOMEM;
      u8 status;

      in_mad  = kzalloc(sizeof *in_mad, GFP_KERNEL);
      out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
      if (!in_mad || !out_mad)
            goto out;

      init_query_mad(in_mad);
      in_mad->attr_id = IB_SMP_ATTR_NODE_DESC;

      err = mthca_MAD_IFC(dev, 1, 1,
                      1, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      memcpy(dev->ib_dev.node_desc, out_mad->data, 64);

      in_mad->attr_id = IB_SMP_ATTR_NODE_INFO;

      err = mthca_MAD_IFC(dev, 1, 1,
                      1, NULL, NULL, in_mad, out_mad,
                      &status);
      if (err)
            goto out;
      if (status) {
            err = -EINVAL;
            goto out;
      }

      memcpy(&dev->ib_dev.node_guid, out_mad->data + 12, 8);

out:
      kfree(in_mad);
      kfree(out_mad);
      return err;
}

int mthca_register_device(struct mthca_dev *dev)
{
      int ret;
      int i;

      ret = mthca_init_node_data(dev);
      if (ret)
            return ret;

      strlcpy(dev->ib_dev.name, "mthca%d", IB_DEVICE_NAME_MAX);
      dev->ib_dev.owner                = THIS_MODULE;

      dev->ib_dev.uverbs_abi_ver     = MTHCA_UVERBS_ABI_VERSION;
      dev->ib_dev.uverbs_cmd_mask    =
            (1ull << IB_USER_VERBS_CMD_GET_CONTEXT)         |
            (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE)  |
            (1ull << IB_USER_VERBS_CMD_QUERY_PORT)          |
            (1ull << IB_USER_VERBS_CMD_ALLOC_PD)            |
            (1ull << IB_USER_VERBS_CMD_DEALLOC_PD)          |
            (1ull << IB_USER_VERBS_CMD_REG_MR)        |
            (1ull << IB_USER_VERBS_CMD_DEREG_MR)            |
            (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
            (1ull << IB_USER_VERBS_CMD_CREATE_CQ)           |
            (1ull << IB_USER_VERBS_CMD_RESIZE_CQ)           |
            (1ull << IB_USER_VERBS_CMD_DESTROY_CQ)          |
            (1ull << IB_USER_VERBS_CMD_CREATE_QP)           |
            (1ull << IB_USER_VERBS_CMD_QUERY_QP)            |
            (1ull << IB_USER_VERBS_CMD_MODIFY_QP)           |
            (1ull << IB_USER_VERBS_CMD_DESTROY_QP)          |
            (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST)  |
            (1ull << IB_USER_VERBS_CMD_DETACH_MCAST);
      dev->ib_dev.node_type            = RDMA_NODE_IB_CA;
      dev->ib_dev.phys_port_cnt        = dev->limits.num_ports;
      dev->ib_dev.num_comp_vectors     = 1;
      dev->ib_dev.dma_device           = &dev->pdev->dev;
      dev->ib_dev.query_device         = mthca_query_device;
      dev->ib_dev.query_port           = mthca_query_port;
      dev->ib_dev.modify_device        = mthca_modify_device;
      dev->ib_dev.modify_port          = mthca_modify_port;
      dev->ib_dev.query_pkey           = mthca_query_pkey;
      dev->ib_dev.query_gid            = mthca_query_gid;
      dev->ib_dev.alloc_ucontext       = mthca_alloc_ucontext;
      dev->ib_dev.dealloc_ucontext     = mthca_dealloc_ucontext;
      dev->ib_dev.mmap                 = mthca_mmap_uar;
      dev->ib_dev.alloc_pd             = mthca_alloc_pd;
      dev->ib_dev.dealloc_pd           = mthca_dealloc_pd;
      dev->ib_dev.create_ah            = mthca_ah_create;
      dev->ib_dev.query_ah             = mthca_ah_query;
      dev->ib_dev.destroy_ah           = mthca_ah_destroy;

      if (dev->mthca_flags & MTHCA_FLAG_SRQ) {
            dev->ib_dev.create_srq           = mthca_create_srq;
            dev->ib_dev.modify_srq           = mthca_modify_srq;
            dev->ib_dev.query_srq            = mthca_query_srq;
            dev->ib_dev.destroy_srq          = mthca_destroy_srq;
            dev->ib_dev.uverbs_cmd_mask   |=
                  (1ull << IB_USER_VERBS_CMD_CREATE_SRQ)          |
                  (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ)          |
                  (1ull << IB_USER_VERBS_CMD_QUERY_SRQ)           |
                  (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ);

            if (mthca_is_memfree(dev))
                  dev->ib_dev.post_srq_recv = mthca_arbel_post_srq_recv;
            else
                  dev->ib_dev.post_srq_recv = mthca_tavor_post_srq_recv;
      }

      dev->ib_dev.create_qp            = mthca_create_qp;
      dev->ib_dev.modify_qp            = mthca_modify_qp;
      dev->ib_dev.query_qp             = mthca_query_qp;
      dev->ib_dev.destroy_qp           = mthca_destroy_qp;
      dev->ib_dev.create_cq            = mthca_create_cq;
      dev->ib_dev.resize_cq            = mthca_resize_cq;
      dev->ib_dev.destroy_cq           = mthca_destroy_cq;
      dev->ib_dev.poll_cq              = mthca_poll_cq;
      dev->ib_dev.get_dma_mr           = mthca_get_dma_mr;
      dev->ib_dev.reg_phys_mr          = mthca_reg_phys_mr;
      dev->ib_dev.reg_user_mr          = mthca_reg_user_mr;
      dev->ib_dev.dereg_mr             = mthca_dereg_mr;

      if (dev->mthca_flags & MTHCA_FLAG_FMR) {
            dev->ib_dev.alloc_fmr            = mthca_alloc_fmr;
            dev->ib_dev.unmap_fmr            = mthca_unmap_fmr;
            dev->ib_dev.dealloc_fmr          = mthca_dealloc_fmr;
            if (mthca_is_memfree(dev))
                  dev->ib_dev.map_phys_fmr = mthca_arbel_map_phys_fmr;
            else
                  dev->ib_dev.map_phys_fmr = mthca_tavor_map_phys_fmr;
      }

      dev->ib_dev.attach_mcast         = mthca_multicast_attach;
      dev->ib_dev.detach_mcast         = mthca_multicast_detach;
      dev->ib_dev.process_mad          = mthca_process_mad;

      if (mthca_is_memfree(dev)) {
            dev->ib_dev.req_notify_cq = mthca_arbel_arm_cq;
            dev->ib_dev.post_send     = mthca_arbel_post_send;
            dev->ib_dev.post_recv     = mthca_arbel_post_receive;
      } else {
            dev->ib_dev.req_notify_cq = mthca_tavor_arm_cq;
            dev->ib_dev.post_send     = mthca_tavor_post_send;
            dev->ib_dev.post_recv     = mthca_tavor_post_receive;
      }

      mutex_init(&dev->cap_mask_mutex);

      ret = ib_register_device(&dev->ib_dev);
      if (ret)
            return ret;

      for (i = 0; i < ARRAY_SIZE(mthca_class_attributes); ++i) {
            ret = class_device_create_file(&dev->ib_dev.class_dev,
                                     mthca_class_attributes[i]);
            if (ret) {
                  ib_unregister_device(&dev->ib_dev);
                  return ret;
            }
      }

      mthca_start_catas_poll(dev);

      return 0;
}

void mthca_unregister_device(struct mthca_dev *dev)
{
      mthca_stop_catas_poll(dev);
      ib_unregister_device(&dev->ib_dev);
}

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