text: /*
   * 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.
   */
  
  #include <rdma/ib_smi.h>
  #include <rdma/ib_umem.h>
  #include <rdma/ib_user_verbs.h>
  
  #include <linux/sched.h>
  #include <linux/slab.h>
  #include <linux/stat.h>
  #include <linux/mm.h>
  #include <linux/export.h>
  
  #include "mthca_dev.h"
  #include "mthca_cmd.h"
  #include <rdma/mthca-abi.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_udata *uhw)
  {
  	struct ib_smp *in_mad  = NULL;
  	struct ib_smp *out_mad = NULL;
  	int err = -ENOMEM;
  	struct mthca_dev *mdev = to_mdev(ibdev);
  
  	if (uhw->inlen || uhw->outlen)
  		return -EINVAL;
  
  	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);
  	if (err)
  		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_sge_rd          = props->max_sge;
  	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;
  
  	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);
  	if (err)
  		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,
  		       IB_DEVICE_NODE_DESC_MAX);
  		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;
  
  	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);
  	if (err)
  		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;
  
  	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);
  	if (err)
  		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;
  
  	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);
  	if (err)
  		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);
  	if (err)
  		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;
  
  	if (!(to_mdev(ibdev)->active))
  		return ERR_PTR(-EAGAIN);
  
  	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);
  	}
  
  	context->reg_mr_warned = 0;
  
  	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;
  
  	if (init_attr->srq_type != IB_SRQT_BASIC)
  		return ERR_PTR(-ENOSYS);
  
  	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;
  
  	if (init_attr->create_flags)
  		return ERR_PTR(-EINVAL);
  
  	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,
  				     const struct ib_cq_init_attr *attr,
  				     struct ib_ucontext *context,
  				     struct ib_udata *udata)
  {
  	int entries = attr->cqe;
  	struct mthca_create_cq ucmd;
  	struct mthca_cq *cq;
  	int nent;
  	int err;
  
  	if (attr->flags)
  		return ERR_PTR(-EINVAL);
  
  	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);
  		err = -EFAULT;
  		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;
  	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));
  
  	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_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 scatterlist *sg;
  	struct mthca_mr *mr;
  	struct mthca_reg_mr ucmd;
  	u64 *pages;
  	int shift, n, len;
  	int i, k, entry;
  	int err = 0;
  	int write_mtt_size;
  
  	if (udata->inlen - sizeof (struct ib_uverbs_cmd_hdr) < sizeof ucmd) {
  		if (!to_mucontext(pd->uobject->context)->reg_mr_warned) {
  			mthca_warn(dev, "Process '%s' did not pass in MR attrs.\n",
  				   current->comm);
  			mthca_warn(dev, "  Update libmthca to fix this.\n");
  		}
  		++to_mucontext(pd->uobject->context)->reg_mr_warned;
  		ucmd.mr_attrs = 0;
  	} else if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
  		return ERR_PTR(-EFAULT);
  
  	mr = kmalloc(sizeof *mr, GFP_KERNEL);
  	if (!mr)
  		return ERR_PTR(-ENOMEM);
  
  	mr->umem = ib_umem_get(pd->uobject->context, start, length, acc,
  			       ucmd.mr_attrs & MTHCA_MR_DMASYNC);
  
  	if (IS_ERR(mr->umem)) {
  		err = PTR_ERR(mr->umem);
  		goto err;
  	}
  
  	shift = ffs(mr->umem->page_size) - 1;
  	n = mr->umem->nmap;
  
  	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));
  
  	for_each_sg(mr->umem->sg_head.sgl, sg, mr->umem->nmap, entry) {
  		len = sg_dma_len(sg) >> shift;
  		for (k = 0; k < len; ++k) {
  			pages[i++] = sg_dma_address(sg) +
  				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;
  	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);
  	return err;
  }
  
  static ssize_t show_rev(struct device *device, struct device_attribute *attr,
  			char *buf)
  {
  	struct mthca_dev *dev =
  		container_of(device, struct mthca_dev, ib_dev.dev);
  	return sprintf(buf, "%x\n", dev->rev_id);
  }
  
  static ssize_t show_hca(struct device *device, struct device_attribute *attr,
  			char *buf)
  {
  	struct mthca_dev *dev =
  		container_of(device, struct mthca_dev, ib_dev.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 device *device, struct device_attribute *attr,
  			  char *buf)
  {
  	struct mthca_dev *dev =
  		container_of(device, struct mthca_dev, ib_dev.dev);
  	return sprintf(buf, "%.*s\n", MTHCA_BOARD_ID_LEN, dev->board_id);
  }
  
  static DEVICE_ATTR(hw_rev,   S_IRUGO, show_rev,    NULL);
  static DEVICE_ATTR(hca_type, S_IRUGO, show_hca,    NULL);
  static DEVICE_ATTR(board_id, S_IRUGO, show_board,  NULL);
  
  static struct device_attribute *mthca_dev_attributes[] = {
  	&dev_attr_hw_rev,
  	&dev_attr_hca_type,
  	&dev_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;
  
  	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);
  	if (err)
  		goto out;
  
  	memcpy(dev->ib_dev.node_desc, out_mad->data, IB_DEVICE_NODE_DESC_MAX);
  
  	in_mad->attr_id = IB_SMP_ATTR_NODE_INFO;
  
  	err = mthca_MAD_IFC(dev, 1, 1,
  			    1, NULL, NULL, in_mad, out_mad);
  	if (err)
  		goto out;
  
  	if (mthca_is_memfree(dev))
  		dev->rev_id = be32_to_cpup((__be32 *) (out_mad->data + 32));
  	memcpy(&dev->ib_dev.node_guid, out_mad->data + 12, 8);
  
  out:
  	kfree(in_mad);
  	kfree(out_mad);
  	return err;
  }
  
  static int mthca_port_immutable(struct ib_device *ibdev, u8 port_num,
  			        struct ib_port_immutable *immutable)
  {
  	struct ib_port_attr attr;
  	int err;
  
  	err = mthca_query_port(ibdev, port_num, &attr);
  	if (err)
  		return err;
  
  	immutable->pkey_tbl_len = attr.pkey_tbl_len;
  	immutable->gid_tbl_len = attr.gid_tbl_len;
  	immutable->core_cap_flags = RDMA_CORE_PORT_IBA_IB;
  	immutable->max_mad_size = IB_MGMT_MAD_SIZE;
  
  	return 0;
  }
  
  static void get_dev_fw_str(struct ib_device *device, char *str,
  			   size_t str_len)
  {
  	struct mthca_dev *dev =
  		container_of(device, struct mthca_dev, ib_dev);
  	snprintf(str, str_len, "%d.%d.%d",
  		 (int) (dev->fw_ver >> 32),
  		 (int) (dev->fw_ver >> 16) & 0xffff,
  		 (int) dev->fw_ver & 0xffff);
  }
  
  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_user_mr          = mthca_reg_user_mr;
  	dev->ib_dev.dereg_mr             = mthca_dereg_mr;
  	dev->ib_dev.get_port_immutable   = mthca_port_immutable;
  	dev->ib_dev.get_dev_fw_str       = get_dev_fw_str;
  
  	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, NULL);
  	if (ret)
  		return ret;
  
  	for (i = 0; i < ARRAY_SIZE(mthca_dev_attributes); ++i) {
  		ret = device_create_file(&dev->ib_dev.dev,
  					 mthca_dev_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);
  }
  