text: /*
   * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   * Copyright (c) 2005, 2006, 2007 Cisco Systems.  All rights reserved.
   * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
   * Copyright (c) 2006 Mellanox Technologies.  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 <linux/file.h>
  #include <linux/fs.h>
  #include <linux/slab.h>
  #include <linux/sched.h>
  
  #include <linux/uaccess.h>
  
  #include <rdma/uverbs_types.h>
  #include <rdma/uverbs_std_types.h>
  #include "rdma_core.h"
  
  #include "uverbs.h"
  #include "core_priv.h"
  
  /*
   * Copy a response to userspace. If the provided 'resp' is larger than the
   * user buffer it is silently truncated. If the user provided a larger buffer
   * then the trailing portion is zero filled.
   *
   * These semantics are intended to support future extension of the output
   * structures.
   */
  static int uverbs_response(struct uverbs_attr_bundle *attrs, const void *resp,
  			   size_t resp_len)
  {
  	int ret;
  
  	if (uverbs_attr_is_valid(attrs, UVERBS_ATTR_CORE_OUT))
  		return uverbs_copy_to_struct_or_zero(
  			attrs, UVERBS_ATTR_CORE_OUT, resp, resp_len);
  
  	if (copy_to_user(attrs->ucore.outbuf, resp,
  			 min(attrs->ucore.outlen, resp_len)))
  		return -EFAULT;
  
  	if (resp_len < attrs->ucore.outlen) {
  		/*
  		 * Zero fill any extra memory that user
  		 * space might have provided.
  		 */
  		ret = clear_user(attrs->ucore.outbuf + resp_len,
  				 attrs->ucore.outlen - resp_len);
  		if (ret)
  			return -EFAULT;
  	}
  
  	return 0;
  }
  
  /*
   * Copy a request from userspace. If the provided 'req' is larger than the
   * user buffer then the user buffer is zero extended into the 'req'. If 'req'
   * is smaller than the user buffer then the uncopied bytes in the user buffer
   * must be zero.
   */
  static int uverbs_request(struct uverbs_attr_bundle *attrs, void *req,
  			  size_t req_len)
  {
  	if (copy_from_user(req, attrs->ucore.inbuf,
  			   min(attrs->ucore.inlen, req_len)))
  		return -EFAULT;
  
  	if (attrs->ucore.inlen < req_len) {
  		memset(req + attrs->ucore.inlen, 0,
  		       req_len - attrs->ucore.inlen);
  	} else if (attrs->ucore.inlen > req_len) {
  		if (!ib_is_buffer_cleared(attrs->ucore.inbuf + req_len,
  					  attrs->ucore.inlen - req_len))
  			return -EOPNOTSUPP;
  	}
  	return 0;
  }
  
  /*
   * Generate the value for the 'response_length' protocol used by write_ex.
   * This is the number of bytes the kernel actually wrote. Userspace can use
   * this to detect what structure members in the response the kernel
   * understood.
   */
  static u32 uverbs_response_length(struct uverbs_attr_bundle *attrs,
  				  size_t resp_len)
  {
  	return min_t(size_t, attrs->ucore.outlen, resp_len);
  }
  
  /*
   * The iterator version of the request interface is for handlers that need to
   * step over a flex array at the end of a command header.
   */
  struct uverbs_req_iter {
  	const void __user *cur;
  	const void __user *end;
  };
  
  static int uverbs_request_start(struct uverbs_attr_bundle *attrs,
  				struct uverbs_req_iter *iter,
  				void *req,
  				size_t req_len)
  {
  	if (attrs->ucore.inlen < req_len)
  		return -ENOSPC;
  
  	if (copy_from_user(req, attrs->ucore.inbuf, req_len))
  		return -EFAULT;
  
  	iter->cur = attrs->ucore.inbuf + req_len;
  	iter->end = attrs->ucore.inbuf + attrs->ucore.inlen;
  	return 0;
  }
  
  static int uverbs_request_next(struct uverbs_req_iter *iter, void *val,
  			       size_t len)
  {
  	if (iter->cur + len > iter->end)
  		return -ENOSPC;
  
  	if (copy_from_user(val, iter->cur, len))
  		return -EFAULT;
  
  	iter->cur += len;
  	return 0;
  }
  
  static const void __user *uverbs_request_next_ptr(struct uverbs_req_iter *iter,
  						  size_t len)
  {
  	const void __user *res = iter->cur;
  
  	if (iter->cur + len > iter->end)
  		return ERR_PTR(-ENOSPC);
  	iter->cur += len;
  	return res;
  }
  
  static int uverbs_request_finish(struct uverbs_req_iter *iter)
  {
  	if (!ib_is_buffer_cleared(iter->cur, iter->end - iter->cur))
  		return -EOPNOTSUPP;
  	return 0;
  }
  
  static struct ib_uverbs_completion_event_file *
  _ib_uverbs_lookup_comp_file(s32 fd, const struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uobject *uobj = ufd_get_read(UVERBS_OBJECT_COMP_CHANNEL,
  					       fd, attrs);
  
  	if (IS_ERR(uobj))
  		return (void *)uobj;
  
  	uverbs_uobject_get(uobj);
  	uobj_put_read(uobj);
  
  	return container_of(uobj, struct ib_uverbs_completion_event_file,
  			    uobj);
  }
  #define ib_uverbs_lookup_comp_file(_fd, _ufile)                                \
  	_ib_uverbs_lookup_comp_file((_fd)*typecheck(s32, _fd), _ufile)
  
  static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_file *file = attrs->ufile;
  	struct ib_uverbs_get_context      cmd;
  	struct ib_uverbs_get_context_resp resp;
  	struct ib_ucontext		 *ucontext;
  	struct file			 *filp;
  	struct ib_rdmacg_object		 cg_obj;
  	struct ib_device *ib_dev;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	mutex_lock(&file->ucontext_lock);
  	ib_dev = srcu_dereference(file->device->ib_dev,
  				  &file->device->disassociate_srcu);
  	if (!ib_dev) {
  		ret = -EIO;
  		goto err;
  	}
  
  	if (file->ucontext) {
  		ret = -EINVAL;
  		goto err;
  	}
  
  	ret = ib_rdmacg_try_charge(&cg_obj, ib_dev, RDMACG_RESOURCE_HCA_HANDLE);
  	if (ret)
  		goto err;
  
  	ucontext = rdma_zalloc_drv_obj(ib_dev, ib_ucontext);
  	if (!ucontext) {
  		ret = -ENOMEM;
  		goto err_alloc;
  	}
  
  	ucontext->res.type = RDMA_RESTRACK_CTX;
  	ucontext->device = ib_dev;
  	ucontext->cg_obj = cg_obj;
  	/* ufile is required when some objects are released */
  	ucontext->ufile = file;
  
  	ucontext->closing = false;
  	ucontext->cleanup_retryable = false;
  
  	mutex_init(&ucontext->per_mm_list_lock);
  	INIT_LIST_HEAD(&ucontext->per_mm_list);
  
  	ret = get_unused_fd_flags(O_CLOEXEC);
  	if (ret < 0)
  		goto err_free;
  	resp.async_fd = ret;
  
  	filp = ib_uverbs_alloc_async_event_file(file, ib_dev);
  	if (IS_ERR(filp)) {
  		ret = PTR_ERR(filp);
  		goto err_fd;
  	}
  
  	resp.num_comp_vectors = file->device->num_comp_vectors;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_file;
  
  	ret = ib_dev->ops.alloc_ucontext(ucontext, &attrs->driver_udata);
  	if (ret)
  		goto err_file;
  	if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING))
  		ucontext->invalidate_range = NULL;
  
  	rdma_restrack_uadd(&ucontext->res);
  
  	fd_install(resp.async_fd, filp);
  
  	/*
  	 * Make sure that ib_uverbs_get_ucontext() sees the pointer update
  	 * only after all writes to setup the ucontext have completed
  	 */
  	smp_store_release(&file->ucontext, ucontext);
  
  	mutex_unlock(&file->ucontext_lock);
  
  	return 0;
  
  err_file:
  	ib_uverbs_free_async_event_file(file);
  	fput(filp);
  
  err_fd:
  	put_unused_fd(resp.async_fd);
  
  err_free:
  	kfree(ucontext);
  
  err_alloc:
  	ib_rdmacg_uncharge(&cg_obj, ib_dev, RDMACG_RESOURCE_HCA_HANDLE);
  
  err:
  	mutex_unlock(&file->ucontext_lock);
  	return ret;
  }
  
  static void copy_query_dev_fields(struct ib_ucontext *ucontext,
  				  struct ib_uverbs_query_device_resp *resp,
  				  struct ib_device_attr *attr)
  {
  	struct ib_device *ib_dev = ucontext->device;
  
  	resp->fw_ver		= attr->fw_ver;
  	resp->node_guid		= ib_dev->node_guid;
  	resp->sys_image_guid	= attr->sys_image_guid;
  	resp->max_mr_size	= attr->max_mr_size;
  	resp->page_size_cap	= attr->page_size_cap;
  	resp->vendor_id		= attr->vendor_id;
  	resp->vendor_part_id	= attr->vendor_part_id;
  	resp->hw_ver		= attr->hw_ver;
  	resp->max_qp		= attr->max_qp;
  	resp->max_qp_wr		= attr->max_qp_wr;
  	resp->device_cap_flags	= lower_32_bits(attr->device_cap_flags);
  	resp->max_sge		= min(attr->max_send_sge, attr->max_recv_sge);
  	resp->max_sge_rd	= attr->max_sge_rd;
  	resp->max_cq		= attr->max_cq;
  	resp->max_cqe		= attr->max_cqe;
  	resp->max_mr		= attr->max_mr;
  	resp->max_pd		= attr->max_pd;
  	resp->max_qp_rd_atom	= attr->max_qp_rd_atom;
  	resp->max_ee_rd_atom	= attr->max_ee_rd_atom;
  	resp->max_res_rd_atom	= attr->max_res_rd_atom;
  	resp->max_qp_init_rd_atom	= attr->max_qp_init_rd_atom;
  	resp->max_ee_init_rd_atom	= attr->max_ee_init_rd_atom;
  	resp->atomic_cap		= attr->atomic_cap;
  	resp->max_ee			= attr->max_ee;
  	resp->max_rdd			= attr->max_rdd;
  	resp->max_mw			= attr->max_mw;
  	resp->max_raw_ipv6_qp		= attr->max_raw_ipv6_qp;
  	resp->max_raw_ethy_qp		= attr->max_raw_ethy_qp;
  	resp->max_mcast_grp		= attr->max_mcast_grp;
  	resp->max_mcast_qp_attach	= attr->max_mcast_qp_attach;
  	resp->max_total_mcast_qp_attach	= attr->max_total_mcast_qp_attach;
  	resp->max_ah			= attr->max_ah;
  	resp->max_fmr			= attr->max_fmr;
  	resp->max_map_per_fmr		= attr->max_map_per_fmr;
  	resp->max_srq			= attr->max_srq;
  	resp->max_srq_wr		= attr->max_srq_wr;
  	resp->max_srq_sge		= attr->max_srq_sge;
  	resp->max_pkeys			= attr->max_pkeys;
  	resp->local_ca_ack_delay	= attr->local_ca_ack_delay;
  	resp->phys_port_cnt		= ib_dev->phys_port_cnt;
  }
  
  static int ib_uverbs_query_device(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_query_device      cmd;
  	struct ib_uverbs_query_device_resp resp;
  	struct ib_ucontext *ucontext;
  	int ret;
  
  	ucontext = ib_uverbs_get_ucontext(attrs);
  	if (IS_ERR(ucontext))
  		return PTR_ERR(ucontext);
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	memset(&resp, 0, sizeof resp);
  	copy_query_dev_fields(ucontext, &resp, &ucontext->device->attrs);
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_query_port(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_query_port      cmd;
  	struct ib_uverbs_query_port_resp resp;
  	struct ib_port_attr              attr;
  	int                              ret;
  	struct ib_ucontext *ucontext;
  	struct ib_device *ib_dev;
  
  	ucontext = ib_uverbs_get_ucontext(attrs);
  	if (IS_ERR(ucontext))
  		return PTR_ERR(ucontext);
  	ib_dev = ucontext->device;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	ret = ib_query_port(ib_dev, cmd.port_num, &attr);
  	if (ret)
  		return ret;
  
  	memset(&resp, 0, sizeof resp);
  	copy_port_attr_to_resp(&attr, &resp, ib_dev, cmd.port_num);
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_alloc_pd(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_alloc_pd      cmd;
  	struct ib_uverbs_alloc_pd_resp resp;
  	struct ib_uobject             *uobj;
  	struct ib_pd                  *pd;
  	int                            ret;
  	struct ib_device *ib_dev;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_alloc(UVERBS_OBJECT_PD, attrs, &ib_dev);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	pd = rdma_zalloc_drv_obj(ib_dev, ib_pd);
  	if (!pd) {
  		ret = -ENOMEM;
  		goto err;
  	}
  
  	pd->device  = ib_dev;
  	pd->uobject = uobj;
  	pd->__internal_mr = NULL;
  	atomic_set(&pd->usecnt, 0);
  	pd->res.type = RDMA_RESTRACK_PD;
  
  	ret = ib_dev->ops.alloc_pd(pd, uobj->context, &attrs->driver_udata);
  	if (ret)
  		goto err_alloc;
  
  	uobj->object = pd;
  	memset(&resp, 0, sizeof resp);
  	resp.pd_handle = uobj->id;
  	rdma_restrack_uadd(&pd->res);
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_copy;
  
  	return uobj_alloc_commit(uobj);
  
  err_copy:
  	ib_dealloc_pd(pd);
  	pd = NULL;
  err_alloc:
  	kfree(pd);
  err:
  	uobj_alloc_abort(uobj);
  	return ret;
  }
  
  static int ib_uverbs_dealloc_pd(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_dealloc_pd cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_PD, cmd.pd_handle, attrs);
  }
  
  struct xrcd_table_entry {
  	struct rb_node  node;
  	struct ib_xrcd *xrcd;
  	struct inode   *inode;
  };
  
  static int xrcd_table_insert(struct ib_uverbs_device *dev,
  			    struct inode *inode,
  			    struct ib_xrcd *xrcd)
  {
  	struct xrcd_table_entry *entry, *scan;
  	struct rb_node **p = &dev->xrcd_tree.rb_node;
  	struct rb_node *parent = NULL;
  
  	entry = kmalloc(sizeof *entry, GFP_KERNEL);
  	if (!entry)
  		return -ENOMEM;
  
  	entry->xrcd  = xrcd;
  	entry->inode = inode;
  
  	while (*p) {
  		parent = *p;
  		scan = rb_entry(parent, struct xrcd_table_entry, node);
  
  		if (inode < scan->inode) {
  			p = &(*p)->rb_left;
  		} else if (inode > scan->inode) {
  			p = &(*p)->rb_right;
  		} else {
  			kfree(entry);
  			return -EEXIST;
  		}
  	}
  
  	rb_link_node(&entry->node, parent, p);
  	rb_insert_color(&entry->node, &dev->xrcd_tree);
  	igrab(inode);
  	return 0;
  }
  
  static struct xrcd_table_entry *xrcd_table_search(struct ib_uverbs_device *dev,
  						  struct inode *inode)
  {
  	struct xrcd_table_entry *entry;
  	struct rb_node *p = dev->xrcd_tree.rb_node;
  
  	while (p) {
  		entry = rb_entry(p, struct xrcd_table_entry, node);
  
  		if (inode < entry->inode)
  			p = p->rb_left;
  		else if (inode > entry->inode)
  			p = p->rb_right;
  		else
  			return entry;
  	}
  
  	return NULL;
  }
  
  static struct ib_xrcd *find_xrcd(struct ib_uverbs_device *dev, struct inode *inode)
  {
  	struct xrcd_table_entry *entry;
  
  	entry = xrcd_table_search(dev, inode);
  	if (!entry)
  		return NULL;
  
  	return entry->xrcd;
  }
  
  static void xrcd_table_delete(struct ib_uverbs_device *dev,
  			      struct inode *inode)
  {
  	struct xrcd_table_entry *entry;
  
  	entry = xrcd_table_search(dev, inode);
  	if (entry) {
  		iput(inode);
  		rb_erase(&entry->node, &dev->xrcd_tree);
  		kfree(entry);
  	}
  }
  
  static int ib_uverbs_open_xrcd(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_device *ibudev = attrs->ufile->device;
  	struct ib_uverbs_open_xrcd	cmd;
  	struct ib_uverbs_open_xrcd_resp	resp;
  	struct ib_uxrcd_object         *obj;
  	struct ib_xrcd                 *xrcd = NULL;
  	struct fd			f = {NULL, 0};
  	struct inode                   *inode = NULL;
  	int				ret = 0;
  	int				new_xrcd = 0;
  	struct ib_device *ib_dev;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	mutex_lock(&ibudev->xrcd_tree_mutex);
  
  	if (cmd.fd != -1) {
  		/* search for file descriptor */
  		f = fdget(cmd.fd);
  		if (!f.file) {
  			ret = -EBADF;
  			goto err_tree_mutex_unlock;
  		}
  
  		inode = file_inode(f.file);
  		xrcd = find_xrcd(ibudev, inode);
  		if (!xrcd && !(cmd.oflags & O_CREAT)) {
  			/* no file descriptor. Need CREATE flag */
  			ret = -EAGAIN;
  			goto err_tree_mutex_unlock;
  		}
  
  		if (xrcd && cmd.oflags & O_EXCL) {
  			ret = -EINVAL;
  			goto err_tree_mutex_unlock;
  		}
  	}
  
  	obj = (struct ib_uxrcd_object *)uobj_alloc(UVERBS_OBJECT_XRCD, attrs,
  						   &ib_dev);
  	if (IS_ERR(obj)) {
  		ret = PTR_ERR(obj);
  		goto err_tree_mutex_unlock;
  	}
  
  	if (!xrcd) {
  		xrcd = ib_dev->ops.alloc_xrcd(ib_dev, obj->uobject.context,
  					      &attrs->driver_udata);
  		if (IS_ERR(xrcd)) {
  			ret = PTR_ERR(xrcd);
  			goto err;
  		}
  
  		xrcd->inode   = inode;
  		xrcd->device  = ib_dev;
  		atomic_set(&xrcd->usecnt, 0);
  		mutex_init(&xrcd->tgt_qp_mutex);
  		INIT_LIST_HEAD(&xrcd->tgt_qp_list);
  		new_xrcd = 1;
  	}
  
  	atomic_set(&obj->refcnt, 0);
  	obj->uobject.object = xrcd;
  	memset(&resp, 0, sizeof resp);
  	resp.xrcd_handle = obj->uobject.id;
  
  	if (inode) {
  		if (new_xrcd) {
  			/* create new inode/xrcd table entry */
  			ret = xrcd_table_insert(ibudev, inode, xrcd);
  			if (ret)
  				goto err_dealloc_xrcd;
  		}
  		atomic_inc(&xrcd->usecnt);
  	}
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_copy;
  
  	if (f.file)
  		fdput(f);
  
  	mutex_unlock(&ibudev->xrcd_tree_mutex);
  
  	return uobj_alloc_commit(&obj->uobject);
  
  err_copy:
  	if (inode) {
  		if (new_xrcd)
  			xrcd_table_delete(ibudev, inode);
  		atomic_dec(&xrcd->usecnt);
  	}
  
  err_dealloc_xrcd:
  	ib_dealloc_xrcd(xrcd);
  
  err:
  	uobj_alloc_abort(&obj->uobject);
  
  err_tree_mutex_unlock:
  	if (f.file)
  		fdput(f);
  
  	mutex_unlock(&ibudev->xrcd_tree_mutex);
  
  	return ret;
  }
  
  static int ib_uverbs_close_xrcd(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_close_xrcd cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_XRCD, cmd.xrcd_handle, attrs);
  }
  
  int ib_uverbs_dealloc_xrcd(struct ib_uobject *uobject,
  			   struct ib_xrcd *xrcd,
  			   enum rdma_remove_reason why)
  {
  	struct inode *inode;
  	int ret;
  	struct ib_uverbs_device *dev = uobject->context->ufile->device;
  
  	inode = xrcd->inode;
  	if (inode && !atomic_dec_and_test(&xrcd->usecnt))
  		return 0;
  
  	ret = ib_dealloc_xrcd(xrcd);
  
  	if (ib_is_destroy_retryable(ret, why, uobject)) {
  		atomic_inc(&xrcd->usecnt);
  		return ret;
  	}
  
  	if (inode)
  		xrcd_table_delete(dev, inode);
  
  	return ret;
  }
  
  static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_reg_mr      cmd;
  	struct ib_uverbs_reg_mr_resp resp;
  	struct ib_uobject           *uobj;
  	struct ib_pd                *pd;
  	struct ib_mr                *mr;
  	int                          ret;
  	struct ib_device *ib_dev;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
  		return -EINVAL;
  
  	ret = ib_check_mr_access(cmd.access_flags);
  	if (ret)
  		return ret;
  
  	uobj = uobj_alloc(UVERBS_OBJECT_MR, attrs, &ib_dev);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd.pd_handle, attrs);
  	if (!pd) {
  		ret = -EINVAL;
  		goto err_free;
  	}
  
  	if (cmd.access_flags & IB_ACCESS_ON_DEMAND) {
  		if (!(pd->device->attrs.device_cap_flags &
  		      IB_DEVICE_ON_DEMAND_PAGING)) {
  			pr_debug("ODP support not available\n");
  			ret = -EINVAL;
  			goto err_put;
  		}
  	}
  
  	mr = pd->device->ops.reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
  					 cmd.access_flags,
  					 &attrs->driver_udata);
  	if (IS_ERR(mr)) {
  		ret = PTR_ERR(mr);
  		goto err_put;
  	}
  
  	mr->device  = pd->device;
  	mr->pd      = pd;
  	mr->dm	    = NULL;
  	mr->uobject = uobj;
  	atomic_inc(&pd->usecnt);
  	mr->res.type = RDMA_RESTRACK_MR;
  	rdma_restrack_uadd(&mr->res);
  
  	uobj->object = mr;
  
  	memset(&resp, 0, sizeof resp);
  	resp.lkey      = mr->lkey;
  	resp.rkey      = mr->rkey;
  	resp.mr_handle = uobj->id;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_copy;
  
  	uobj_put_obj_read(pd);
  
  	return uobj_alloc_commit(uobj);
  
  err_copy:
  	ib_dereg_mr(mr);
  
  err_put:
  	uobj_put_obj_read(pd);
  
  err_free:
  	uobj_alloc_abort(uobj);
  	return ret;
  }
  
  static int ib_uverbs_rereg_mr(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_rereg_mr      cmd;
  	struct ib_uverbs_rereg_mr_resp resp;
  	struct ib_pd                *pd = NULL;
  	struct ib_mr                *mr;
  	struct ib_pd		    *old_pd;
  	int                          ret;
  	struct ib_uobject	    *uobj;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (cmd.flags & ~IB_MR_REREG_SUPPORTED || !cmd.flags)
  		return -EINVAL;
  
  	if ((cmd.flags & IB_MR_REREG_TRANS) &&
  	    (!cmd.start || !cmd.hca_va || 0 >= cmd.length ||
  	     (cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK)))
  			return -EINVAL;
  
  	uobj = uobj_get_write(UVERBS_OBJECT_MR, cmd.mr_handle, attrs);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	mr = uobj->object;
  
  	if (mr->dm) {
  		ret = -EINVAL;
  		goto put_uobjs;
  	}
  
  	if (cmd.flags & IB_MR_REREG_ACCESS) {
  		ret = ib_check_mr_access(cmd.access_flags);
  		if (ret)
  			goto put_uobjs;
  	}
  
  	if (cmd.flags & IB_MR_REREG_PD) {
  		pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd.pd_handle,
  				       attrs);
  		if (!pd) {
  			ret = -EINVAL;
  			goto put_uobjs;
  		}
  	}
  
  	old_pd = mr->pd;
  	ret = mr->device->ops.rereg_user_mr(mr, cmd.flags, cmd.start,
  					    cmd.length, cmd.hca_va,
  					    cmd.access_flags, pd,
  					    &attrs->driver_udata);
  	if (ret)
  		goto put_uobj_pd;
  
  	if (cmd.flags & IB_MR_REREG_PD) {
  		atomic_inc(&pd->usecnt);
  		mr->pd = pd;
  		atomic_dec(&old_pd->usecnt);
  	}
  
  	memset(&resp, 0, sizeof(resp));
  	resp.lkey      = mr->lkey;
  	resp.rkey      = mr->rkey;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  
  put_uobj_pd:
  	if (cmd.flags & IB_MR_REREG_PD)
  		uobj_put_obj_read(pd);
  
  put_uobjs:
  	uobj_put_write(uobj);
  
  	return ret;
  }
  
  static int ib_uverbs_dereg_mr(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_dereg_mr cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_MR, cmd.mr_handle, attrs);
  }
  
  static int ib_uverbs_alloc_mw(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_alloc_mw      cmd;
  	struct ib_uverbs_alloc_mw_resp resp;
  	struct ib_uobject             *uobj;
  	struct ib_pd                  *pd;
  	struct ib_mw                  *mw;
  	int                            ret;
  	struct ib_device *ib_dev;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_alloc(UVERBS_OBJECT_MW, attrs, &ib_dev);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd.pd_handle, attrs);
  	if (!pd) {
  		ret = -EINVAL;
  		goto err_free;
  	}
  
  	if (cmd.mw_type != IB_MW_TYPE_1 && cmd.mw_type != IB_MW_TYPE_2) {
  		ret = -EINVAL;
  		goto err_put;
  	}
  
  	mw = pd->device->ops.alloc_mw(pd, cmd.mw_type, &attrs->driver_udata);
  	if (IS_ERR(mw)) {
  		ret = PTR_ERR(mw);
  		goto err_put;
  	}
  
  	mw->device  = pd->device;
  	mw->pd      = pd;
  	mw->uobject = uobj;
  	atomic_inc(&pd->usecnt);
  
  	uobj->object = mw;
  
  	memset(&resp, 0, sizeof(resp));
  	resp.rkey      = mw->rkey;
  	resp.mw_handle = uobj->id;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_copy;
  
  	uobj_put_obj_read(pd);
  	return uobj_alloc_commit(uobj);
  
  err_copy:
  	uverbs_dealloc_mw(mw);
  err_put:
  	uobj_put_obj_read(pd);
  err_free:
  	uobj_alloc_abort(uobj);
  	return ret;
  }
  
  static int ib_uverbs_dealloc_mw(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_dealloc_mw cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_MW, cmd.mw_handle, attrs);
  }
  
  static int ib_uverbs_create_comp_channel(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_comp_channel	   cmd;
  	struct ib_uverbs_create_comp_channel_resp  resp;
  	struct ib_uobject			  *uobj;
  	struct ib_uverbs_completion_event_file	  *ev_file;
  	struct ib_device *ib_dev;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_alloc(UVERBS_OBJECT_COMP_CHANNEL, attrs, &ib_dev);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	resp.fd = uobj->id;
  
  	ev_file = container_of(uobj, struct ib_uverbs_completion_event_file,
  			       uobj);
  	ib_uverbs_init_event_queue(&ev_file->ev_queue);
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret) {
  		uobj_alloc_abort(uobj);
  		return ret;
  	}
  
  	return uobj_alloc_commit(uobj);
  }
  
  static struct ib_ucq_object *create_cq(struct uverbs_attr_bundle *attrs,
  				       struct ib_uverbs_ex_create_cq *cmd)
  {
  	struct ib_ucq_object           *obj;
  	struct ib_uverbs_completion_event_file    *ev_file = NULL;
  	struct ib_cq                   *cq;
  	int                             ret;
  	struct ib_uverbs_ex_create_cq_resp resp;
  	struct ib_cq_init_attr attr = {};
  	struct ib_device *ib_dev;
  
  	if (cmd->comp_vector >= attrs->ufile->device->num_comp_vectors)
  		return ERR_PTR(-EINVAL);
  
  	obj = (struct ib_ucq_object *)uobj_alloc(UVERBS_OBJECT_CQ, attrs,
  						 &ib_dev);
  	if (IS_ERR(obj))
  		return obj;
  
  	if (cmd->comp_channel >= 0) {
  		ev_file = ib_uverbs_lookup_comp_file(cmd->comp_channel, attrs);
  		if (IS_ERR(ev_file)) {
  			ret = PTR_ERR(ev_file);
  			goto err;
  		}
  	}
  
  	obj->uobject.user_handle = cmd->user_handle;
  	obj->comp_events_reported  = 0;
  	obj->async_events_reported = 0;
  	INIT_LIST_HEAD(&obj->comp_list);
  	INIT_LIST_HEAD(&obj->async_list);
  
  	attr.cqe = cmd->cqe;
  	attr.comp_vector = cmd->comp_vector;
  	attr.flags = cmd->flags;
  
  	cq = ib_dev->ops.create_cq(ib_dev, &attr, obj->uobject.context,
  				   &attrs->driver_udata);
  	if (IS_ERR(cq)) {
  		ret = PTR_ERR(cq);
  		goto err_file;
  	}
  
  	cq->device        = ib_dev;
  	cq->uobject       = &obj->uobject;
  	cq->comp_handler  = ib_uverbs_comp_handler;
  	cq->event_handler = ib_uverbs_cq_event_handler;
  	cq->cq_context    = ev_file ? &ev_file->ev_queue : NULL;
  	atomic_set(&cq->usecnt, 0);
  
  	obj->uobject.object = cq;
  	memset(&resp, 0, sizeof resp);
  	resp.base.cq_handle = obj->uobject.id;
  	resp.base.cqe       = cq->cqe;
  	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
  
  	cq->res.type = RDMA_RESTRACK_CQ;
  	rdma_restrack_uadd(&cq->res);
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_cb;
  
  	ret = uobj_alloc_commit(&obj->uobject);
  	if (ret)
  		return ERR_PTR(ret);
  	return obj;
  
  err_cb:
  	ib_destroy_cq(cq);
  
  err_file:
  	if (ev_file)
  		ib_uverbs_release_ucq(attrs->ufile, ev_file, obj);
  
  err:
  	uobj_alloc_abort(&obj->uobject);
  
  	return ERR_PTR(ret);
  }
  
  static int ib_uverbs_create_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_cq      cmd;
  	struct ib_uverbs_ex_create_cq	cmd_ex;
  	struct ib_ucq_object           *obj;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	memset(&cmd_ex, 0, sizeof(cmd_ex));
  	cmd_ex.user_handle = cmd.user_handle;
  	cmd_ex.cqe = cmd.cqe;
  	cmd_ex.comp_vector = cmd.comp_vector;
  	cmd_ex.comp_channel = cmd.comp_channel;
  
  	obj = create_cq(attrs, &cmd_ex);
  	return PTR_ERR_OR_ZERO(obj);
  }
  
  static int ib_uverbs_ex_create_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_create_cq  cmd;
  	struct ib_ucq_object           *obj;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (cmd.comp_mask)
  		return -EINVAL;
  
  	if (cmd.reserved)
  		return -EINVAL;
  
  	obj = create_cq(attrs, &cmd);
  	return PTR_ERR_OR_ZERO(obj);
  }
  
  static int ib_uverbs_resize_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_resize_cq	cmd;
  	struct ib_uverbs_resize_cq_resp	resp = {};
  	struct ib_cq			*cq;
  	int				ret = -EINVAL;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	cq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ, cmd.cq_handle, attrs);
  	if (!cq)
  		return -EINVAL;
  
  	ret = cq->device->ops.resize_cq(cq, cmd.cqe, &attrs->driver_udata);
  	if (ret)
  		goto out;
  
  	resp.cqe = cq->cqe;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  out:
  	uobj_put_obj_read(cq);
  
  	return ret;
  }
  
  static int copy_wc_to_user(struct ib_device *ib_dev, void __user *dest,
  			   struct ib_wc *wc)
  {
  	struct ib_uverbs_wc tmp;
  
  	tmp.wr_id		= wc->wr_id;
  	tmp.status		= wc->status;
  	tmp.opcode		= wc->opcode;
  	tmp.vendor_err		= wc->vendor_err;
  	tmp.byte_len		= wc->byte_len;
  	tmp.ex.imm_data		= wc->ex.imm_data;
  	tmp.qp_num		= wc->qp->qp_num;
  	tmp.src_qp		= wc->src_qp;
  	tmp.wc_flags		= wc->wc_flags;
  	tmp.pkey_index		= wc->pkey_index;
  	if (rdma_cap_opa_ah(ib_dev, wc->port_num))
  		tmp.slid	= OPA_TO_IB_UCAST_LID(wc->slid);
  	else
  		tmp.slid	= ib_lid_cpu16(wc->slid);
  	tmp.sl			= wc->sl;
  	tmp.dlid_path_bits	= wc->dlid_path_bits;
  	tmp.port_num		= wc->port_num;
  	tmp.reserved		= 0;
  
  	if (copy_to_user(dest, &tmp, sizeof tmp))
  		return -EFAULT;
  
  	return 0;
  }
  
  static int ib_uverbs_poll_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_poll_cq       cmd;
  	struct ib_uverbs_poll_cq_resp  resp;
  	u8 __user                     *header_ptr;
  	u8 __user                     *data_ptr;
  	struct ib_cq                  *cq;
  	struct ib_wc                   wc;
  	int                            ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	cq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ, cmd.cq_handle, attrs);
  	if (!cq)
  		return -EINVAL;
  
  	/* we copy a struct ib_uverbs_poll_cq_resp to user space */
  	header_ptr = attrs->ucore.outbuf;
  	data_ptr = header_ptr + sizeof resp;
  
  	memset(&resp, 0, sizeof resp);
  	while (resp.count < cmd.ne) {
  		ret = ib_poll_cq(cq, 1, &wc);
  		if (ret < 0)
  			goto out_put;
  		if (!ret)
  			break;
  
  		ret = copy_wc_to_user(cq->device, data_ptr, &wc);
  		if (ret)
  			goto out_put;
  
  		data_ptr += sizeof(struct ib_uverbs_wc);
  		++resp.count;
  	}
  
  	if (copy_to_user(header_ptr, &resp, sizeof resp)) {
  		ret = -EFAULT;
  		goto out_put;
  	}
  	ret = 0;
  
  	if (uverbs_attr_is_valid(attrs, UVERBS_ATTR_CORE_OUT))
  		ret = uverbs_output_written(attrs, UVERBS_ATTR_CORE_OUT);
  
  out_put:
  	uobj_put_obj_read(cq);
  	return ret;
  }
  
  static int ib_uverbs_req_notify_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_req_notify_cq cmd;
  	struct ib_cq                  *cq;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	cq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ, cmd.cq_handle, attrs);
  	if (!cq)
  		return -EINVAL;
  
  	ib_req_notify_cq(cq, cmd.solicited_only ?
  			 IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
  
  	uobj_put_obj_read(cq);
  
  	return 0;
  }
  
  static int ib_uverbs_destroy_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_destroy_cq      cmd;
  	struct ib_uverbs_destroy_cq_resp resp;
  	struct ib_uobject		*uobj;
  	struct ib_ucq_object        	*obj;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_get_destroy(UVERBS_OBJECT_CQ, cmd.cq_handle, attrs);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	obj = container_of(uobj, struct ib_ucq_object, uobject);
  	memset(&resp, 0, sizeof(resp));
  	resp.comp_events_reported  = obj->comp_events_reported;
  	resp.async_events_reported = obj->async_events_reported;
  
  	uobj_put_destroy(uobj);
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int create_qp(struct uverbs_attr_bundle *attrs,
  		     struct ib_uverbs_ex_create_qp *cmd)
  {
  	struct ib_uqp_object		*obj;
  	struct ib_device		*device;
  	struct ib_pd			*pd = NULL;
  	struct ib_xrcd			*xrcd = NULL;
  	struct ib_uobject		*xrcd_uobj = ERR_PTR(-ENOENT);
  	struct ib_cq			*scq = NULL, *rcq = NULL;
  	struct ib_srq			*srq = NULL;
  	struct ib_qp			*qp;
  	struct ib_qp_init_attr		attr = {};
  	struct ib_uverbs_ex_create_qp_resp resp;
  	int				ret;
  	struct ib_rwq_ind_table *ind_tbl = NULL;
  	bool has_sq = true;
  	struct ib_device *ib_dev;
  
  	if (cmd->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
  		return -EPERM;
  
  	obj = (struct ib_uqp_object *)uobj_alloc(UVERBS_OBJECT_QP, attrs,
  						 &ib_dev);
  	if (IS_ERR(obj))
  		return PTR_ERR(obj);
  	obj->uxrcd = NULL;
  	obj->uevent.uobject.user_handle = cmd->user_handle;
  	mutex_init(&obj->mcast_lock);
  
  	if (cmd->comp_mask & IB_UVERBS_CREATE_QP_MASK_IND_TABLE) {
  		ind_tbl = uobj_get_obj_read(rwq_ind_table,
  					    UVERBS_OBJECT_RWQ_IND_TBL,
  					    cmd->rwq_ind_tbl_handle, attrs);
  		if (!ind_tbl) {
  			ret = -EINVAL;
  			goto err_put;
  		}
  
  		attr.rwq_ind_tbl = ind_tbl;
  	}
  
  	if (ind_tbl && (cmd->max_recv_wr || cmd->max_recv_sge || cmd->is_srq)) {
  		ret = -EINVAL;
  		goto err_put;
  	}
  
  	if (ind_tbl && !cmd->max_send_wr)
  		has_sq = false;
  
  	if (cmd->qp_type == IB_QPT_XRC_TGT) {
  		xrcd_uobj = uobj_get_read(UVERBS_OBJECT_XRCD, cmd->pd_handle,
  					  attrs);
  
  		if (IS_ERR(xrcd_uobj)) {
  			ret = -EINVAL;
  			goto err_put;
  		}
  
  		xrcd = (struct ib_xrcd *)xrcd_uobj->object;
  		if (!xrcd) {
  			ret = -EINVAL;
  			goto err_put;
  		}
  		device = xrcd->device;
  	} else {
  		if (cmd->qp_type == IB_QPT_XRC_INI) {
  			cmd->max_recv_wr = 0;
  			cmd->max_recv_sge = 0;
  		} else {
  			if (cmd->is_srq) {
  				srq = uobj_get_obj_read(srq, UVERBS_OBJECT_SRQ,
  							cmd->srq_handle, attrs);
  				if (!srq || srq->srq_type == IB_SRQT_XRC) {
  					ret = -EINVAL;
  					goto err_put;
  				}
  			}
  
  			if (!ind_tbl) {
  				if (cmd->recv_cq_handle != cmd->send_cq_handle) {
  					rcq = uobj_get_obj_read(
  						cq, UVERBS_OBJECT_CQ,
  						cmd->recv_cq_handle, attrs);
  					if (!rcq) {
  						ret = -EINVAL;
  						goto err_put;
  					}
  				}
  			}
  		}
  
  		if (has_sq)
  			scq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ,
  						cmd->send_cq_handle, attrs);
  		if (!ind_tbl)
  			rcq = rcq ?: scq;
  		pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd->pd_handle,
  				       attrs);
  		if (!pd || (!scq && has_sq)) {
  			ret = -EINVAL;
  			goto err_put;
  		}
  
  		device = pd->device;
  	}
  
  	attr.event_handler = ib_uverbs_qp_event_handler;
  	attr.qp_context    = attrs->ufile;
  	attr.send_cq       = scq;
  	attr.recv_cq       = rcq;
  	attr.srq           = srq;
  	attr.xrcd	   = xrcd;
  	attr.sq_sig_type   = cmd->sq_sig_all ? IB_SIGNAL_ALL_WR :
  					      IB_SIGNAL_REQ_WR;
  	attr.qp_type       = cmd->qp_type;
  	attr.create_flags  = 0;
  
  	attr.cap.max_send_wr     = cmd->max_send_wr;
  	attr.cap.max_recv_wr     = cmd->max_recv_wr;
  	attr.cap.max_send_sge    = cmd->max_send_sge;
  	attr.cap.max_recv_sge    = cmd->max_recv_sge;
  	attr.cap.max_inline_data = cmd->max_inline_data;
  
  	obj->uevent.events_reported     = 0;
  	INIT_LIST_HEAD(&obj->uevent.event_list);
  	INIT_LIST_HEAD(&obj->mcast_list);
  
  	attr.create_flags = cmd->create_flags;
  	if (attr.create_flags & ~(IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK |
  				IB_QP_CREATE_CROSS_CHANNEL |
  				IB_QP_CREATE_MANAGED_SEND |
  				IB_QP_CREATE_MANAGED_RECV |
  				IB_QP_CREATE_SCATTER_FCS |
  				IB_QP_CREATE_CVLAN_STRIPPING |
  				IB_QP_CREATE_SOURCE_QPN |
  				IB_QP_CREATE_PCI_WRITE_END_PADDING)) {
  		ret = -EINVAL;
  		goto err_put;
  	}
  
  	if (attr.create_flags & IB_QP_CREATE_SOURCE_QPN) {
  		if (!capable(CAP_NET_RAW)) {
  			ret = -EPERM;
  			goto err_put;
  		}
  
  		attr.source_qpn = cmd->source_qpn;
  	}
  
  	if (cmd->qp_type == IB_QPT_XRC_TGT)
  		qp = ib_create_qp(pd, &attr);
  	else
  		qp = _ib_create_qp(device, pd, &attr, &attrs->driver_udata,
  				   &obj->uevent.uobject);
  
  	if (IS_ERR(qp)) {
  		ret = PTR_ERR(qp);
  		goto err_put;
  	}
  
  	if (cmd->qp_type != IB_QPT_XRC_TGT) {
  		ret = ib_create_qp_security(qp, device);
  		if (ret)
  			goto err_cb;
  
  		qp->real_qp	  = qp;
  		qp->pd		  = pd;
  		qp->send_cq	  = attr.send_cq;
  		qp->recv_cq	  = attr.recv_cq;
  		qp->srq		  = attr.srq;
  		qp->rwq_ind_tbl	  = ind_tbl;
  		qp->event_handler = attr.event_handler;
  		qp->qp_context	  = attr.qp_context;
  		qp->qp_type	  = attr.qp_type;
  		atomic_set(&qp->usecnt, 0);
  		atomic_inc(&pd->usecnt);
  		qp->port = 0;
  		if (attr.send_cq)
  			atomic_inc(&attr.send_cq->usecnt);
  		if (attr.recv_cq)
  			atomic_inc(&attr.recv_cq->usecnt);
  		if (attr.srq)
  			atomic_inc(&attr.srq->usecnt);
  		if (ind_tbl)
  			atomic_inc(&ind_tbl->usecnt);
  	} else {
  		/* It is done in _ib_create_qp for other QP types */
  		qp->uobject = &obj->uevent.uobject;
  	}
  
  	obj->uevent.uobject.object = qp;
  
  	memset(&resp, 0, sizeof resp);
  	resp.base.qpn             = qp->qp_num;
  	resp.base.qp_handle       = obj->uevent.uobject.id;
  	resp.base.max_recv_sge    = attr.cap.max_recv_sge;
  	resp.base.max_send_sge    = attr.cap.max_send_sge;
  	resp.base.max_recv_wr     = attr.cap.max_recv_wr;
  	resp.base.max_send_wr     = attr.cap.max_send_wr;
  	resp.base.max_inline_data = attr.cap.max_inline_data;
  	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_cb;
  
  	if (xrcd) {
  		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
  					  uobject);
  		atomic_inc(&obj->uxrcd->refcnt);
  		uobj_put_read(xrcd_uobj);
  	}
  
  	if (pd)
  		uobj_put_obj_read(pd);
  	if (scq)
  		uobj_put_obj_read(scq);
  	if (rcq && rcq != scq)
  		uobj_put_obj_read(rcq);
  	if (srq)
  		uobj_put_obj_read(srq);
  	if (ind_tbl)
  		uobj_put_obj_read(ind_tbl);
  
  	return uobj_alloc_commit(&obj->uevent.uobject);
  err_cb:
  	ib_destroy_qp(qp);
  
  err_put:
  	if (!IS_ERR(xrcd_uobj))
  		uobj_put_read(xrcd_uobj);
  	if (pd)
  		uobj_put_obj_read(pd);
  	if (scq)
  		uobj_put_obj_read(scq);
  	if (rcq && rcq != scq)
  		uobj_put_obj_read(rcq);
  	if (srq)
  		uobj_put_obj_read(srq);
  	if (ind_tbl)
  		uobj_put_obj_read(ind_tbl);
  
  	uobj_alloc_abort(&obj->uevent.uobject);
  	return ret;
  }
  
  static int ib_uverbs_create_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_qp      cmd;
  	struct ib_uverbs_ex_create_qp	cmd_ex;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	memset(&cmd_ex, 0, sizeof(cmd_ex));
  	cmd_ex.user_handle = cmd.user_handle;
  	cmd_ex.pd_handle = cmd.pd_handle;
  	cmd_ex.send_cq_handle = cmd.send_cq_handle;
  	cmd_ex.recv_cq_handle = cmd.recv_cq_handle;
  	cmd_ex.srq_handle = cmd.srq_handle;
  	cmd_ex.max_send_wr = cmd.max_send_wr;
  	cmd_ex.max_recv_wr = cmd.max_recv_wr;
  	cmd_ex.max_send_sge = cmd.max_send_sge;
  	cmd_ex.max_recv_sge = cmd.max_recv_sge;
  	cmd_ex.max_inline_data = cmd.max_inline_data;
  	cmd_ex.sq_sig_all = cmd.sq_sig_all;
  	cmd_ex.qp_type = cmd.qp_type;
  	cmd_ex.is_srq = cmd.is_srq;
  
  	return create_qp(attrs, &cmd_ex);
  }
  
  static int ib_uverbs_ex_create_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_create_qp cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (cmd.comp_mask & ~IB_UVERBS_CREATE_QP_SUP_COMP_MASK)
  		return -EINVAL;
  
  	if (cmd.reserved)
  		return -EINVAL;
  
  	return create_qp(attrs, &cmd);
  }
  
  static int ib_uverbs_open_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_open_qp        cmd;
  	struct ib_uverbs_create_qp_resp resp;
  	struct ib_uqp_object           *obj;
  	struct ib_xrcd		       *xrcd;
  	struct ib_uobject	       *uninitialized_var(xrcd_uobj);
  	struct ib_qp                   *qp;
  	struct ib_qp_open_attr          attr;
  	int ret;
  	struct ib_device *ib_dev;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	obj = (struct ib_uqp_object *)uobj_alloc(UVERBS_OBJECT_QP, attrs,
  						 &ib_dev);
  	if (IS_ERR(obj))
  		return PTR_ERR(obj);
  
  	xrcd_uobj = uobj_get_read(UVERBS_OBJECT_XRCD, cmd.pd_handle, attrs);
  	if (IS_ERR(xrcd_uobj)) {
  		ret = -EINVAL;
  		goto err_put;
  	}
  
  	xrcd = (struct ib_xrcd *)xrcd_uobj->object;
  	if (!xrcd) {
  		ret = -EINVAL;
  		goto err_xrcd;
  	}
  
  	attr.event_handler = ib_uverbs_qp_event_handler;
  	attr.qp_context    = attrs->ufile;
  	attr.qp_num        = cmd.qpn;
  	attr.qp_type       = cmd.qp_type;
  
  	obj->uevent.events_reported = 0;
  	INIT_LIST_HEAD(&obj->uevent.event_list);
  	INIT_LIST_HEAD(&obj->mcast_list);
  
  	qp = ib_open_qp(xrcd, &attr);
  	if (IS_ERR(qp)) {
  		ret = PTR_ERR(qp);
  		goto err_xrcd;
  	}
  
  	obj->uevent.uobject.object = qp;
  	obj->uevent.uobject.user_handle = cmd.user_handle;
  
  	memset(&resp, 0, sizeof resp);
  	resp.qpn       = qp->qp_num;
  	resp.qp_handle = obj->uevent.uobject.id;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_destroy;
  
  	obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
  	atomic_inc(&obj->uxrcd->refcnt);
  	qp->uobject = &obj->uevent.uobject;
  	uobj_put_read(xrcd_uobj);
  
  	return uobj_alloc_commit(&obj->uevent.uobject);
  
  err_destroy:
  	ib_destroy_qp(qp);
  err_xrcd:
  	uobj_put_read(xrcd_uobj);
  err_put:
  	uobj_alloc_abort(&obj->uevent.uobject);
  	return ret;
  }
  
  static void copy_ah_attr_to_uverbs(struct ib_uverbs_qp_dest *uverb_attr,
  				   struct rdma_ah_attr *rdma_attr)
  {
  	const struct ib_global_route   *grh;
  
  	uverb_attr->dlid              = rdma_ah_get_dlid(rdma_attr);
  	uverb_attr->sl                = rdma_ah_get_sl(rdma_attr);
  	uverb_attr->src_path_bits     = rdma_ah_get_path_bits(rdma_attr);
  	uverb_attr->static_rate       = rdma_ah_get_static_rate(rdma_attr);
  	uverb_attr->is_global         = !!(rdma_ah_get_ah_flags(rdma_attr) &
  					 IB_AH_GRH);
  	if (uverb_attr->is_global) {
  		grh = rdma_ah_read_grh(rdma_attr);
  		memcpy(uverb_attr->dgid, grh->dgid.raw, 16);
  		uverb_attr->flow_label        = grh->flow_label;
  		uverb_attr->sgid_index        = grh->sgid_index;
  		uverb_attr->hop_limit         = grh->hop_limit;
  		uverb_attr->traffic_class     = grh->traffic_class;
  	}
  	uverb_attr->port_num          = rdma_ah_get_port_num(rdma_attr);
  }
  
  static int ib_uverbs_query_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_query_qp      cmd;
  	struct ib_uverbs_query_qp_resp resp;
  	struct ib_qp                   *qp;
  	struct ib_qp_attr              *attr;
  	struct ib_qp_init_attr         *init_attr;
  	int                            ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	attr      = kmalloc(sizeof *attr, GFP_KERNEL);
  	init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
  	if (!attr || !init_attr) {
  		ret = -ENOMEM;
  		goto out;
  	}
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (!qp) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
  
  	uobj_put_obj_read(qp);
  
  	if (ret)
  		goto out;
  
  	memset(&resp, 0, sizeof resp);
  
  	resp.qp_state               = attr->qp_state;
  	resp.cur_qp_state           = attr->cur_qp_state;
  	resp.path_mtu               = attr->path_mtu;
  	resp.path_mig_state         = attr->path_mig_state;
  	resp.qkey                   = attr->qkey;
  	resp.rq_psn                 = attr->rq_psn;
  	resp.sq_psn                 = attr->sq_psn;
  	resp.dest_qp_num            = attr->dest_qp_num;
  	resp.qp_access_flags        = attr->qp_access_flags;
  	resp.pkey_index             = attr->pkey_index;
  	resp.alt_pkey_index         = attr->alt_pkey_index;
  	resp.sq_draining            = attr->sq_draining;
  	resp.max_rd_atomic          = attr->max_rd_atomic;
  	resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
  	resp.min_rnr_timer          = attr->min_rnr_timer;
  	resp.port_num               = attr->port_num;
  	resp.timeout                = attr->timeout;
  	resp.retry_cnt              = attr->retry_cnt;
  	resp.rnr_retry              = attr->rnr_retry;
  	resp.alt_port_num           = attr->alt_port_num;
  	resp.alt_timeout            = attr->alt_timeout;
  
  	copy_ah_attr_to_uverbs(&resp.dest, &attr->ah_attr);
  	copy_ah_attr_to_uverbs(&resp.alt_dest, &attr->alt_ah_attr);
  
  	resp.max_send_wr            = init_attr->cap.max_send_wr;
  	resp.max_recv_wr            = init_attr->cap.max_recv_wr;
  	resp.max_send_sge           = init_attr->cap.max_send_sge;
  	resp.max_recv_sge           = init_attr->cap.max_recv_sge;
  	resp.max_inline_data        = init_attr->cap.max_inline_data;
  	resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  
  out:
  	kfree(attr);
  	kfree(init_attr);
  
  	return ret;
  }
  
  /* Remove ignored fields set in the attribute mask */
  static int modify_qp_mask(enum ib_qp_type qp_type, int mask)
  {
  	switch (qp_type) {
  	case IB_QPT_XRC_INI:
  		return mask & ~(IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER);
  	case IB_QPT_XRC_TGT:
  		return mask & ~(IB_QP_MAX_QP_RD_ATOMIC | IB_QP_RETRY_CNT |
  				IB_QP_RNR_RETRY);
  	default:
  		return mask;
  	}
  }
  
  static void copy_ah_attr_from_uverbs(struct ib_device *dev,
  				     struct rdma_ah_attr *rdma_attr,
  				     struct ib_uverbs_qp_dest *uverb_attr)
  {
  	rdma_attr->type = rdma_ah_find_type(dev, uverb_attr->port_num);
  	if (uverb_attr->is_global) {
  		rdma_ah_set_grh(rdma_attr, NULL,
  				uverb_attr->flow_label,
  				uverb_attr->sgid_index,
  				uverb_attr->hop_limit,
  				uverb_attr->traffic_class);
  		rdma_ah_set_dgid_raw(rdma_attr, uverb_attr->dgid);
  	} else {
  		rdma_ah_set_ah_flags(rdma_attr, 0);
  	}
  	rdma_ah_set_dlid(rdma_attr, uverb_attr->dlid);
  	rdma_ah_set_sl(rdma_attr, uverb_attr->sl);
  	rdma_ah_set_path_bits(rdma_attr, uverb_attr->src_path_bits);
  	rdma_ah_set_static_rate(rdma_attr, uverb_attr->static_rate);
  	rdma_ah_set_port_num(rdma_attr, uverb_attr->port_num);
  	rdma_ah_set_make_grd(rdma_attr, false);
  }
  
  static int modify_qp(struct uverbs_attr_bundle *attrs,
  		     struct ib_uverbs_ex_modify_qp *cmd)
  {
  	struct ib_qp_attr *attr;
  	struct ib_qp *qp;
  	int ret;
  
  	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
  	if (!attr)
  		return -ENOMEM;
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd->base.qp_handle,
  			       attrs);
  	if (!qp) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	if ((cmd->base.attr_mask & IB_QP_PORT) &&
  	    !rdma_is_port_valid(qp->device, cmd->base.port_num)) {
  		ret = -EINVAL;
  		goto release_qp;
  	}
  
  	if ((cmd->base.attr_mask & IB_QP_AV)) {
  		if (!rdma_is_port_valid(qp->device, cmd->base.dest.port_num)) {
  			ret = -EINVAL;
  			goto release_qp;
  		}
  
  		if (cmd->base.attr_mask & IB_QP_STATE &&
  		    cmd->base.qp_state == IB_QPS_RTR) {
  		/* We are in INIT->RTR TRANSITION (if we are not,
  		 * this transition will be rejected in subsequent checks).
  		 * In the INIT->RTR transition, we cannot have IB_QP_PORT set,
  		 * but the IB_QP_STATE flag is required.
  		 *
  		 * Since kernel 3.14 (commit dbf727de7440), the uverbs driver,
  		 * when IB_QP_AV is set, has required inclusion of a valid
  		 * port number in the primary AV. (AVs are created and handled
  		 * differently for infiniband and ethernet (RoCE) ports).
  		 *
  		 * Check the port number included in the primary AV against
  		 * the port number in the qp struct, which was set (and saved)
  		 * in the RST->INIT transition.
  		 */
  			if (cmd->base.dest.port_num != qp->real_qp->port) {
  				ret = -EINVAL;
  				goto release_qp;
  			}
  		} else {
  		/* We are in SQD->SQD. (If we are not, this transition will
  		 * be rejected later in the verbs layer checks).
  		 * Check for both IB_QP_PORT and IB_QP_AV, these can be set
  		 * together in the SQD->SQD transition.
  		 *
  		 * If only IP_QP_AV was set, add in IB_QP_PORT as well (the
  		 * verbs layer driver does not track primary port changes
  		 * resulting from path migration. Thus, in SQD, if the primary
  		 * AV is modified, the primary port should also be modified).
  		 *
  		 * Note that in this transition, the IB_QP_STATE flag
  		 * is not allowed.
  		 */
  			if (((cmd->base.attr_mask & (IB_QP_AV | IB_QP_PORT))
  			     == (IB_QP_AV | IB_QP_PORT)) &&
  			    cmd->base.port_num != cmd->base.dest.port_num) {
  				ret = -EINVAL;
  				goto release_qp;
  			}
  			if ((cmd->base.attr_mask & (IB_QP_AV | IB_QP_PORT))
  			    == IB_QP_AV) {
  				cmd->base.attr_mask |= IB_QP_PORT;
  				cmd->base.port_num = cmd->base.dest.port_num;
  			}
  		}
  	}
  
  	if ((cmd->base.attr_mask & IB_QP_ALT_PATH) &&
  	    (!rdma_is_port_valid(qp->device, cmd->base.alt_port_num) ||
  	    !rdma_is_port_valid(qp->device, cmd->base.alt_dest.port_num) ||
  	    cmd->base.alt_port_num != cmd->base.alt_dest.port_num)) {
  		ret = -EINVAL;
  		goto release_qp;
  	}
  
  	if ((cmd->base.attr_mask & IB_QP_CUR_STATE &&
  	    cmd->base.cur_qp_state > IB_QPS_ERR) ||
  	    (cmd->base.attr_mask & IB_QP_STATE &&
  	    cmd->base.qp_state > IB_QPS_ERR)) {
  		ret = -EINVAL;
  		goto release_qp;
  	}
  
  	if (cmd->base.attr_mask & IB_QP_STATE)
  		attr->qp_state = cmd->base.qp_state;
  	if (cmd->base.attr_mask & IB_QP_CUR_STATE)
  		attr->cur_qp_state = cmd->base.cur_qp_state;
  	if (cmd->base.attr_mask & IB_QP_PATH_MTU)
  		attr->path_mtu = cmd->base.path_mtu;
  	if (cmd->base.attr_mask & IB_QP_PATH_MIG_STATE)
  		attr->path_mig_state = cmd->base.path_mig_state;
  	if (cmd->base.attr_mask & IB_QP_QKEY)
  		attr->qkey = cmd->base.qkey;
  	if (cmd->base.attr_mask & IB_QP_RQ_PSN)
  		attr->rq_psn = cmd->base.rq_psn;
  	if (cmd->base.attr_mask & IB_QP_SQ_PSN)
  		attr->sq_psn = cmd->base.sq_psn;
  	if (cmd->base.attr_mask & IB_QP_DEST_QPN)
  		attr->dest_qp_num = cmd->base.dest_qp_num;
  	if (cmd->base.attr_mask & IB_QP_ACCESS_FLAGS)
  		attr->qp_access_flags = cmd->base.qp_access_flags;
  	if (cmd->base.attr_mask & IB_QP_PKEY_INDEX)
  		attr->pkey_index = cmd->base.pkey_index;
  	if (cmd->base.attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY)
  		attr->en_sqd_async_notify = cmd->base.en_sqd_async_notify;
  	if (cmd->base.attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
  		attr->max_rd_atomic = cmd->base.max_rd_atomic;
  	if (cmd->base.attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
  		attr->max_dest_rd_atomic = cmd->base.max_dest_rd_atomic;
  	if (cmd->base.attr_mask & IB_QP_MIN_RNR_TIMER)
  		attr->min_rnr_timer = cmd->base.min_rnr_timer;
  	if (cmd->base.attr_mask & IB_QP_PORT)
  		attr->port_num = cmd->base.port_num;
  	if (cmd->base.attr_mask & IB_QP_TIMEOUT)
  		attr->timeout = cmd->base.timeout;
  	if (cmd->base.attr_mask & IB_QP_RETRY_CNT)
  		attr->retry_cnt = cmd->base.retry_cnt;
  	if (cmd->base.attr_mask & IB_QP_RNR_RETRY)
  		attr->rnr_retry = cmd->base.rnr_retry;
  	if (cmd->base.attr_mask & IB_QP_ALT_PATH) {
  		attr->alt_port_num = cmd->base.alt_port_num;
  		attr->alt_timeout = cmd->base.alt_timeout;
  		attr->alt_pkey_index = cmd->base.alt_pkey_index;
  	}
  	if (cmd->base.attr_mask & IB_QP_RATE_LIMIT)
  		attr->rate_limit = cmd->rate_limit;
  
  	if (cmd->base.attr_mask & IB_QP_AV)
  		copy_ah_attr_from_uverbs(qp->device, &attr->ah_attr,
  					 &cmd->base.dest);
  
  	if (cmd->base.attr_mask & IB_QP_ALT_PATH)
  		copy_ah_attr_from_uverbs(qp->device, &attr->alt_ah_attr,
  					 &cmd->base.alt_dest);
  
  	ret = ib_modify_qp_with_udata(qp, attr,
  				      modify_qp_mask(qp->qp_type,
  						     cmd->base.attr_mask),
  				      &attrs->driver_udata);
  
  release_qp:
  	uobj_put_obj_read(qp);
  out:
  	kfree(attr);
  
  	return ret;
  }
  
  static int ib_uverbs_modify_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_modify_qp cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd.base, sizeof(cmd.base));
  	if (ret)
  		return ret;
  
  	if (cmd.base.attr_mask &
  	    ~((IB_USER_LEGACY_LAST_QP_ATTR_MASK << 1) - 1))
  		return -EOPNOTSUPP;
  
  	return modify_qp(attrs, &cmd);
  }
  
  static int ib_uverbs_ex_modify_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_modify_qp cmd;
  	struct ib_uverbs_ex_modify_qp_resp resp = {
  		.response_length = uverbs_response_length(attrs, sizeof(resp))
  	};
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	/*
  	 * Last bit is reserved for extending the attr_mask by
  	 * using another field.
  	 */
  	BUILD_BUG_ON(IB_USER_LAST_QP_ATTR_MASK == (1 << 31));
  
  	if (cmd.base.attr_mask &
  	    ~((IB_USER_LAST_QP_ATTR_MASK << 1) - 1))
  		return -EOPNOTSUPP;
  
  	ret = modify_qp(attrs, &cmd);
  	if (ret)
  		return ret;
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_destroy_qp(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_destroy_qp      cmd;
  	struct ib_uverbs_destroy_qp_resp resp;
  	struct ib_uobject		*uobj;
  	struct ib_uqp_object        	*obj;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_get_destroy(UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
  	memset(&resp, 0, sizeof(resp));
  	resp.events_reported = obj->uevent.events_reported;
  
  	uobj_put_destroy(uobj);
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static void *alloc_wr(size_t wr_size, __u32 num_sge)
  {
  	if (num_sge >= (U32_MAX - ALIGN(wr_size, sizeof (struct ib_sge))) /
  		       sizeof (struct ib_sge))
  		return NULL;
  
  	return kmalloc(ALIGN(wr_size, sizeof (struct ib_sge)) +
  			 num_sge * sizeof (struct ib_sge), GFP_KERNEL);
  }
  
  static int ib_uverbs_post_send(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_post_send      cmd;
  	struct ib_uverbs_post_send_resp resp;
  	struct ib_uverbs_send_wr       *user_wr;
  	struct ib_send_wr              *wr = NULL, *last, *next;
  	const struct ib_send_wr	       *bad_wr;
  	struct ib_qp                   *qp;
  	int                             i, sg_ind;
  	int				is_ud;
  	int ret, ret2;
  	size_t                          next_size;
  	const struct ib_sge __user *sgls;
  	const void __user *wqes;
  	struct uverbs_req_iter iter;
  
  	ret = uverbs_request_start(attrs, &iter, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  	wqes = uverbs_request_next_ptr(&iter, cmd.wqe_size * cmd.wr_count);
  	if (IS_ERR(wqes))
  		return PTR_ERR(wqes);
  	sgls = uverbs_request_next_ptr(
  		&iter, cmd.sge_count * sizeof(struct ib_uverbs_sge));
  	if (IS_ERR(sgls))
  		return PTR_ERR(sgls);
  	ret = uverbs_request_finish(&iter);
  	if (ret)
  		return ret;
  
  	user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
  	if (!user_wr)
  		return -ENOMEM;
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (!qp) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	is_ud = qp->qp_type == IB_QPT_UD;
  	sg_ind = 0;
  	last = NULL;
  	for (i = 0; i < cmd.wr_count; ++i) {
  		if (copy_from_user(user_wr, wqes + i * cmd.wqe_size,
  				   cmd.wqe_size)) {
  			ret = -EFAULT;
  			goto out_put;
  		}
  
  		if (user_wr->num_sge + sg_ind > cmd.sge_count) {
  			ret = -EINVAL;
  			goto out_put;
  		}
  
  		if (is_ud) {
  			struct ib_ud_wr *ud;
  
  			if (user_wr->opcode != IB_WR_SEND &&
  			    user_wr->opcode != IB_WR_SEND_WITH_IMM) {
  				ret = -EINVAL;
  				goto out_put;
  			}
  
  			next_size = sizeof(*ud);
  			ud = alloc_wr(next_size, user_wr->num_sge);
  			if (!ud) {
  				ret = -ENOMEM;
  				goto out_put;
  			}
  
  			ud->ah = uobj_get_obj_read(ah, UVERBS_OBJECT_AH,
  						   user_wr->wr.ud.ah, attrs);
  			if (!ud->ah) {
  				kfree(ud);
  				ret = -EINVAL;
  				goto out_put;
  			}
  			ud->remote_qpn = user_wr->wr.ud.remote_qpn;
  			ud->remote_qkey = user_wr->wr.ud.remote_qkey;
  
  			next = &ud->wr;
  		} else if (user_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM ||
  			   user_wr->opcode == IB_WR_RDMA_WRITE ||
  			   user_wr->opcode == IB_WR_RDMA_READ) {
  			struct ib_rdma_wr *rdma;
  
  			next_size = sizeof(*rdma);
  			rdma = alloc_wr(next_size, user_wr->num_sge);
  			if (!rdma) {
  				ret = -ENOMEM;
  				goto out_put;
  			}
  
  			rdma->remote_addr = user_wr->wr.rdma.remote_addr;
  			rdma->rkey = user_wr->wr.rdma.rkey;
  
  			next = &rdma->wr;
  		} else if (user_wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
  			   user_wr->opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
  			struct ib_atomic_wr *atomic;
  
  			next_size = sizeof(*atomic);
  			atomic = alloc_wr(next_size, user_wr->num_sge);
  			if (!atomic) {
  				ret = -ENOMEM;
  				goto out_put;
  			}
  
  			atomic->remote_addr = user_wr->wr.atomic.remote_addr;
  			atomic->compare_add = user_wr->wr.atomic.compare_add;
  			atomic->swap = user_wr->wr.atomic.swap;
  			atomic->rkey = user_wr->wr.atomic.rkey;
  
  			next = &atomic->wr;
  		} else if (user_wr->opcode == IB_WR_SEND ||
  			   user_wr->opcode == IB_WR_SEND_WITH_IMM ||
  			   user_wr->opcode == IB_WR_SEND_WITH_INV) {
  			next_size = sizeof(*next);
  			next = alloc_wr(next_size, user_wr->num_sge);
  			if (!next) {
  				ret = -ENOMEM;
  				goto out_put;
  			}
  		} else {
  			ret = -EINVAL;
  			goto out_put;
  		}
  
  		if (user_wr->opcode == IB_WR_SEND_WITH_IMM ||
  		    user_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
  			next->ex.imm_data =
  					(__be32 __force) user_wr->ex.imm_data;
  		} else if (user_wr->opcode == IB_WR_SEND_WITH_INV) {
  			next->ex.invalidate_rkey = user_wr->ex.invalidate_rkey;
  		}
  
  		if (!last)
  			wr = next;
  		else
  			last->next = next;
  		last = next;
  
  		next->next       = NULL;
  		next->wr_id      = user_wr->wr_id;
  		next->num_sge    = user_wr->num_sge;
  		next->opcode     = user_wr->opcode;
  		next->send_flags = user_wr->send_flags;
  
  		if (next->num_sge) {
  			next->sg_list = (void *) next +
  				ALIGN(next_size, sizeof(struct ib_sge));
  			if (copy_from_user(next->sg_list, sgls + sg_ind,
  					   next->num_sge *
  						   sizeof(struct ib_sge))) {
  				ret = -EFAULT;
  				goto out_put;
  			}
  			sg_ind += next->num_sge;
  		} else
  			next->sg_list = NULL;
  	}
  
  	resp.bad_wr = 0;
  	ret = qp->device->ops.post_send(qp->real_qp, wr, &bad_wr);
  	if (ret)
  		for (next = wr; next; next = next->next) {
  			++resp.bad_wr;
  			if (next == bad_wr)
  				break;
  		}
  
  	ret2 = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret2)
  		ret = ret2;
  
  out_put:
  	uobj_put_obj_read(qp);
  
  	while (wr) {
  		if (is_ud && ud_wr(wr)->ah)
  			uobj_put_obj_read(ud_wr(wr)->ah);
  		next = wr->next;
  		kfree(wr);
  		wr = next;
  	}
  
  out:
  	kfree(user_wr);
  
  	return ret;
  }
  
  static struct ib_recv_wr *
  ib_uverbs_unmarshall_recv(struct uverbs_req_iter *iter, u32 wr_count,
  			  u32 wqe_size, u32 sge_count)
  {
  	struct ib_uverbs_recv_wr *user_wr;
  	struct ib_recv_wr        *wr = NULL, *last, *next;
  	int                       sg_ind;
  	int                       i;
  	int                       ret;
  	const struct ib_sge __user *sgls;
  	const void __user *wqes;
  
  	if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
  		return ERR_PTR(-EINVAL);
  
  	wqes = uverbs_request_next_ptr(iter, wqe_size * wr_count);
  	if (IS_ERR(wqes))
  		return ERR_CAST(wqes);
  	sgls = uverbs_request_next_ptr(
  		iter, sge_count * sizeof(struct ib_uverbs_sge));
  	if (IS_ERR(sgls))
  		return ERR_CAST(sgls);
  	ret = uverbs_request_finish(iter);
  	if (ret)
  		return ERR_PTR(ret);
  
  	user_wr = kmalloc(wqe_size, GFP_KERNEL);
  	if (!user_wr)
  		return ERR_PTR(-ENOMEM);
  
  	sg_ind = 0;
  	last = NULL;
  	for (i = 0; i < wr_count; ++i) {
  		if (copy_from_user(user_wr, wqes + i * wqe_size,
  				   wqe_size)) {
  			ret = -EFAULT;
  			goto err;
  		}
  
  		if (user_wr->num_sge + sg_ind > sge_count) {
  			ret = -EINVAL;
  			goto err;
  		}
  
  		if (user_wr->num_sge >=
  		    (U32_MAX - ALIGN(sizeof *next, sizeof (struct ib_sge))) /
  		    sizeof (struct ib_sge)) {
  			ret = -EINVAL;
  			goto err;
  		}
  
  		next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
  			       user_wr->num_sge * sizeof (struct ib_sge),
  			       GFP_KERNEL);
  		if (!next) {
  			ret = -ENOMEM;
  			goto err;
  		}
  
  		if (!last)
  			wr = next;
  		else
  			last->next = next;
  		last = next;
  
  		next->next       = NULL;
  		next->wr_id      = user_wr->wr_id;
  		next->num_sge    = user_wr->num_sge;
  
  		if (next->num_sge) {
  			next->sg_list = (void *) next +
  				ALIGN(sizeof *next, sizeof (struct ib_sge));
  			if (copy_from_user(next->sg_list, sgls + sg_ind,
  					   next->num_sge *
  						   sizeof(struct ib_sge))) {
  				ret = -EFAULT;
  				goto err;
  			}
  			sg_ind += next->num_sge;
  		} else
  			next->sg_list = NULL;
  	}
  
  	kfree(user_wr);
  	return wr;
  
  err:
  	kfree(user_wr);
  
  	while (wr) {
  		next = wr->next;
  		kfree(wr);
  		wr = next;
  	}
  
  	return ERR_PTR(ret);
  }
  
  static int ib_uverbs_post_recv(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_post_recv      cmd;
  	struct ib_uverbs_post_recv_resp resp;
  	struct ib_recv_wr              *wr, *next;
  	const struct ib_recv_wr	       *bad_wr;
  	struct ib_qp                   *qp;
  	int ret, ret2;
  	struct uverbs_req_iter iter;
  
  	ret = uverbs_request_start(attrs, &iter, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	wr = ib_uverbs_unmarshall_recv(&iter, cmd.wr_count, cmd.wqe_size,
  				       cmd.sge_count);
  	if (IS_ERR(wr))
  		return PTR_ERR(wr);
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (!qp) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	resp.bad_wr = 0;
  	ret = qp->device->ops.post_recv(qp->real_qp, wr, &bad_wr);
  
  	uobj_put_obj_read(qp);
  	if (ret) {
  		for (next = wr; next; next = next->next) {
  			++resp.bad_wr;
  			if (next == bad_wr)
  				break;
  		}
  	}
  
  	ret2 = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret2)
  		ret = ret2;
  out:
  	while (wr) {
  		next = wr->next;
  		kfree(wr);
  		wr = next;
  	}
  
  	return ret;
  }
  
  static int ib_uverbs_post_srq_recv(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_post_srq_recv      cmd;
  	struct ib_uverbs_post_srq_recv_resp resp;
  	struct ib_recv_wr                  *wr, *next;
  	const struct ib_recv_wr		   *bad_wr;
  	struct ib_srq                      *srq;
  	int ret, ret2;
  	struct uverbs_req_iter iter;
  
  	ret = uverbs_request_start(attrs, &iter, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	wr = ib_uverbs_unmarshall_recv(&iter, cmd.wr_count, cmd.wqe_size,
  				       cmd.sge_count);
  	if (IS_ERR(wr))
  		return PTR_ERR(wr);
  
  	srq = uobj_get_obj_read(srq, UVERBS_OBJECT_SRQ, cmd.srq_handle, attrs);
  	if (!srq) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	resp.bad_wr = 0;
  	ret = srq->device->ops.post_srq_recv(srq, wr, &bad_wr);
  
  	uobj_put_obj_read(srq);
  
  	if (ret)
  		for (next = wr; next; next = next->next) {
  			++resp.bad_wr;
  			if (next == bad_wr)
  				break;
  		}
  
  	ret2 = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret2)
  		ret = ret2;
  
  out:
  	while (wr) {
  		next = wr->next;
  		kfree(wr);
  		wr = next;
  	}
  
  	return ret;
  }
  
  static int ib_uverbs_create_ah(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_ah	 cmd;
  	struct ib_uverbs_create_ah_resp	 resp;
  	struct ib_uobject		*uobj;
  	struct ib_pd			*pd;
  	struct ib_ah			*ah;
  	struct rdma_ah_attr		attr = {};
  	int ret;
  	struct ib_device *ib_dev;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_alloc(UVERBS_OBJECT_AH, attrs, &ib_dev);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	if (!rdma_is_port_valid(ib_dev, cmd.attr.port_num)) {
  		ret = -EINVAL;
  		goto err;
  	}
  
  	pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd.pd_handle, attrs);
  	if (!pd) {
  		ret = -EINVAL;
  		goto err;
  	}
  
  	attr.type = rdma_ah_find_type(ib_dev, cmd.attr.port_num);
  	rdma_ah_set_make_grd(&attr, false);
  	rdma_ah_set_dlid(&attr, cmd.attr.dlid);
  	rdma_ah_set_sl(&attr, cmd.attr.sl);
  	rdma_ah_set_path_bits(&attr, cmd.attr.src_path_bits);
  	rdma_ah_set_static_rate(&attr, cmd.attr.static_rate);
  	rdma_ah_set_port_num(&attr, cmd.attr.port_num);
  
  	if (cmd.attr.is_global) {
  		rdma_ah_set_grh(&attr, NULL, cmd.attr.grh.flow_label,
  				cmd.attr.grh.sgid_index,
  				cmd.attr.grh.hop_limit,
  				cmd.attr.grh.traffic_class);
  		rdma_ah_set_dgid_raw(&attr, cmd.attr.grh.dgid);
  	} else {
  		rdma_ah_set_ah_flags(&attr, 0);
  	}
  
  	ah = rdma_create_user_ah(pd, &attr, &attrs->driver_udata);
  	if (IS_ERR(ah)) {
  		ret = PTR_ERR(ah);
  		goto err_put;
  	}
  
  	ah->uobject  = uobj;
  	uobj->user_handle = cmd.user_handle;
  	uobj->object = ah;
  
  	resp.ah_handle = uobj->id;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_copy;
  
  	uobj_put_obj_read(pd);
  	return uobj_alloc_commit(uobj);
  
  err_copy:
  	rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
  
  err_put:
  	uobj_put_obj_read(pd);
  
  err:
  	uobj_alloc_abort(uobj);
  	return ret;
  }
  
  static int ib_uverbs_destroy_ah(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_destroy_ah cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_AH, cmd.ah_handle, attrs);
  }
  
  static int ib_uverbs_attach_mcast(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_attach_mcast cmd;
  	struct ib_qp                 *qp;
  	struct ib_uqp_object         *obj;
  	struct ib_uverbs_mcast_entry *mcast;
  	int                           ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (!qp)
  		return -EINVAL;
  
  	obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
  
  	mutex_lock(&obj->mcast_lock);
  	list_for_each_entry(mcast, &obj->mcast_list, list)
  		if (cmd.mlid == mcast->lid &&
  		    !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
  			ret = 0;
  			goto out_put;
  		}
  
  	mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
  	if (!mcast) {
  		ret = -ENOMEM;
  		goto out_put;
  	}
  
  	mcast->lid = cmd.mlid;
  	memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
  
  	ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
  	if (!ret)
  		list_add_tail(&mcast->list, &obj->mcast_list);
  	else
  		kfree(mcast);
  
  out_put:
  	mutex_unlock(&obj->mcast_lock);
  	uobj_put_obj_read(qp);
  
  	return ret;
  }
  
  static int ib_uverbs_detach_mcast(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_detach_mcast cmd;
  	struct ib_uqp_object         *obj;
  	struct ib_qp                 *qp;
  	struct ib_uverbs_mcast_entry *mcast;
  	int                           ret = -EINVAL;
  	bool                          found = false;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (!qp)
  		return -EINVAL;
  
  	obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
  	mutex_lock(&obj->mcast_lock);
  
  	list_for_each_entry(mcast, &obj->mcast_list, list)
  		if (cmd.mlid == mcast->lid &&
  		    !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
  			list_del(&mcast->list);
  			kfree(mcast);
  			found = true;
  			break;
  		}
  
  	if (!found) {
  		ret = -EINVAL;
  		goto out_put;
  	}
  
  	ret = ib_detach_mcast(qp, (union ib_gid *)cmd.gid, cmd.mlid);
  
  out_put:
  	mutex_unlock(&obj->mcast_lock);
  	uobj_put_obj_read(qp);
  	return ret;
  }
  
  struct ib_uflow_resources *flow_resources_alloc(size_t num_specs)
  {
  	struct ib_uflow_resources *resources;
  
  	resources = kzalloc(sizeof(*resources), GFP_KERNEL);
  
  	if (!resources)
  		return NULL;
  
  	if (!num_specs)
  		goto out;
  
  	resources->counters =
  		kcalloc(num_specs, sizeof(*resources->counters), GFP_KERNEL);
  	resources->collection =
  		kcalloc(num_specs, sizeof(*resources->collection), GFP_KERNEL);
  
  	if (!resources->counters || !resources->collection)
  		goto err;
  
  out:
  	resources->max = num_specs;
  	return resources;
  
  err:
  	kfree(resources->counters);
  	kfree(resources);
  
  	return NULL;
  }
  EXPORT_SYMBOL(flow_resources_alloc);
  
  void ib_uverbs_flow_resources_free(struct ib_uflow_resources *uflow_res)
  {
  	unsigned int i;
  
  	if (!uflow_res)
  		return;
  
  	for (i = 0; i < uflow_res->collection_num; i++)
  		atomic_dec(&uflow_res->collection[i]->usecnt);
  
  	for (i = 0; i < uflow_res->counters_num; i++)
  		atomic_dec(&uflow_res->counters[i]->usecnt);
  
  	kfree(uflow_res->collection);
  	kfree(uflow_res->counters);
  	kfree(uflow_res);
  }
  EXPORT_SYMBOL(ib_uverbs_flow_resources_free);
  
  void flow_resources_add(struct ib_uflow_resources *uflow_res,
  			enum ib_flow_spec_type type,
  			void *ibobj)
  {
  	WARN_ON(uflow_res->num >= uflow_res->max);
  
  	switch (type) {
  	case IB_FLOW_SPEC_ACTION_HANDLE:
  		atomic_inc(&((struct ib_flow_action *)ibobj)->usecnt);
  		uflow_res->collection[uflow_res->collection_num++] =
  			(struct ib_flow_action *)ibobj;
  		break;
  	case IB_FLOW_SPEC_ACTION_COUNT:
  		atomic_inc(&((struct ib_counters *)ibobj)->usecnt);
  		uflow_res->counters[uflow_res->counters_num++] =
  			(struct ib_counters *)ibobj;
  		break;
  	default:
  		WARN_ON(1);
  	}
  
  	uflow_res->num++;
  }
  EXPORT_SYMBOL(flow_resources_add);
  
  static int kern_spec_to_ib_spec_action(struct uverbs_attr_bundle *attrs,
  				       struct ib_uverbs_flow_spec *kern_spec,
  				       union ib_flow_spec *ib_spec,
  				       struct ib_uflow_resources *uflow_res)
  {
  	ib_spec->type = kern_spec->type;
  	switch (ib_spec->type) {
  	case IB_FLOW_SPEC_ACTION_TAG:
  		if (kern_spec->flow_tag.size !=
  		    sizeof(struct ib_uverbs_flow_spec_action_tag))
  			return -EINVAL;
  
  		ib_spec->flow_tag.size = sizeof(struct ib_flow_spec_action_tag);
  		ib_spec->flow_tag.tag_id = kern_spec->flow_tag.tag_id;
  		break;
  	case IB_FLOW_SPEC_ACTION_DROP:
  		if (kern_spec->drop.size !=
  		    sizeof(struct ib_uverbs_flow_spec_action_drop))
  			return -EINVAL;
  
  		ib_spec->drop.size = sizeof(struct ib_flow_spec_action_drop);
  		break;
  	case IB_FLOW_SPEC_ACTION_HANDLE:
  		if (kern_spec->action.size !=
  		    sizeof(struct ib_uverbs_flow_spec_action_handle))
  			return -EOPNOTSUPP;
  		ib_spec->action.act = uobj_get_obj_read(flow_action,
  							UVERBS_OBJECT_FLOW_ACTION,
  							kern_spec->action.handle,
  							attrs);
  		if (!ib_spec->action.act)
  			return -EINVAL;
  		ib_spec->action.size =
  			sizeof(struct ib_flow_spec_action_handle);
  		flow_resources_add(uflow_res,
  				   IB_FLOW_SPEC_ACTION_HANDLE,
  				   ib_spec->action.act);
  		uobj_put_obj_read(ib_spec->action.act);
  		break;
  	case IB_FLOW_SPEC_ACTION_COUNT:
  		if (kern_spec->flow_count.size !=
  			sizeof(struct ib_uverbs_flow_spec_action_count))
  			return -EINVAL;
  		ib_spec->flow_count.counters =
  			uobj_get_obj_read(counters,
  					  UVERBS_OBJECT_COUNTERS,
  					  kern_spec->flow_count.handle,
  					  attrs);
  		if (!ib_spec->flow_count.counters)
  			return -EINVAL;
  		ib_spec->flow_count.size =
  				sizeof(struct ib_flow_spec_action_count);
  		flow_resources_add(uflow_res,
  				   IB_FLOW_SPEC_ACTION_COUNT,
  				   ib_spec->flow_count.counters);
  		uobj_put_obj_read(ib_spec->flow_count.counters);
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static size_t kern_spec_filter_sz(const struct ib_uverbs_flow_spec_hdr *spec)
  {
  	/* Returns user space filter size, includes padding */
  	return (spec->size - sizeof(struct ib_uverbs_flow_spec_hdr)) / 2;
  }
  
  static ssize_t spec_filter_size(const void *kern_spec_filter, u16 kern_filter_size,
  				u16 ib_real_filter_sz)
  {
  	/*
  	 * User space filter structures must be 64 bit aligned, otherwise this
  	 * may pass, but we won't handle additional new attributes.
  	 */
  
  	if (kern_filter_size > ib_real_filter_sz) {
  		if (memchr_inv(kern_spec_filter +
  			       ib_real_filter_sz, 0,
  			       kern_filter_size - ib_real_filter_sz))
  			return -EINVAL;
  		return ib_real_filter_sz;
  	}
  	return kern_filter_size;
  }
  
  int ib_uverbs_kern_spec_to_ib_spec_filter(enum ib_flow_spec_type type,
  					  const void *kern_spec_mask,
  					  const void *kern_spec_val,
  					  size_t kern_filter_sz,
  					  union ib_flow_spec *ib_spec)
  {
  	ssize_t actual_filter_sz;
  	ssize_t ib_filter_sz;
  
  	/* User flow spec size must be aligned to 4 bytes */
  	if (kern_filter_sz != ALIGN(kern_filter_sz, 4))
  		return -EINVAL;
  
  	ib_spec->type = type;
  
  	if (ib_spec->type == (IB_FLOW_SPEC_INNER | IB_FLOW_SPEC_VXLAN_TUNNEL))
  		return -EINVAL;
  
  	switch (ib_spec->type & ~IB_FLOW_SPEC_INNER) {
  	case IB_FLOW_SPEC_ETH:
  		ib_filter_sz = offsetof(struct ib_flow_eth_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->size = sizeof(struct ib_flow_spec_eth);
  		memcpy(&ib_spec->eth.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->eth.mask, kern_spec_mask, actual_filter_sz);
  		break;
  	case IB_FLOW_SPEC_IPV4:
  		ib_filter_sz = offsetof(struct ib_flow_ipv4_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->size = sizeof(struct ib_flow_spec_ipv4);
  		memcpy(&ib_spec->ipv4.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->ipv4.mask, kern_spec_mask, actual_filter_sz);
  		break;
  	case IB_FLOW_SPEC_IPV6:
  		ib_filter_sz = offsetof(struct ib_flow_ipv6_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->size = sizeof(struct ib_flow_spec_ipv6);
  		memcpy(&ib_spec->ipv6.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->ipv6.mask, kern_spec_mask, actual_filter_sz);
  
  		if ((ntohl(ib_spec->ipv6.mask.flow_label)) >= BIT(20) ||
  		    (ntohl(ib_spec->ipv6.val.flow_label)) >= BIT(20))
  			return -EINVAL;
  		break;
  	case IB_FLOW_SPEC_TCP:
  	case IB_FLOW_SPEC_UDP:
  		ib_filter_sz = offsetof(struct ib_flow_tcp_udp_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->size = sizeof(struct ib_flow_spec_tcp_udp);
  		memcpy(&ib_spec->tcp_udp.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->tcp_udp.mask, kern_spec_mask, actual_filter_sz);
  		break;
  	case IB_FLOW_SPEC_VXLAN_TUNNEL:
  		ib_filter_sz = offsetof(struct ib_flow_tunnel_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->tunnel.size = sizeof(struct ib_flow_spec_tunnel);
  		memcpy(&ib_spec->tunnel.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->tunnel.mask, kern_spec_mask, actual_filter_sz);
  
  		if ((ntohl(ib_spec->tunnel.mask.tunnel_id)) >= BIT(24) ||
  		    (ntohl(ib_spec->tunnel.val.tunnel_id)) >= BIT(24))
  			return -EINVAL;
  		break;
  	case IB_FLOW_SPEC_ESP:
  		ib_filter_sz = offsetof(struct ib_flow_esp_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->esp.size = sizeof(struct ib_flow_spec_esp);
  		memcpy(&ib_spec->esp.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->esp.mask, kern_spec_mask, actual_filter_sz);
  		break;
  	case IB_FLOW_SPEC_GRE:
  		ib_filter_sz = offsetof(struct ib_flow_gre_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->gre.size = sizeof(struct ib_flow_spec_gre);
  		memcpy(&ib_spec->gre.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->gre.mask, kern_spec_mask, actual_filter_sz);
  		break;
  	case IB_FLOW_SPEC_MPLS:
  		ib_filter_sz = offsetof(struct ib_flow_mpls_filter, real_sz);
  		actual_filter_sz = spec_filter_size(kern_spec_mask,
  						    kern_filter_sz,
  						    ib_filter_sz);
  		if (actual_filter_sz <= 0)
  			return -EINVAL;
  		ib_spec->mpls.size = sizeof(struct ib_flow_spec_mpls);
  		memcpy(&ib_spec->mpls.val, kern_spec_val, actual_filter_sz);
  		memcpy(&ib_spec->mpls.mask, kern_spec_mask, actual_filter_sz);
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int kern_spec_to_ib_spec_filter(struct ib_uverbs_flow_spec *kern_spec,
  				       union ib_flow_spec *ib_spec)
  {
  	ssize_t kern_filter_sz;
  	void *kern_spec_mask;
  	void *kern_spec_val;
  
  	kern_filter_sz = kern_spec_filter_sz(&kern_spec->hdr);
  
  	kern_spec_val = (void *)kern_spec +
  		sizeof(struct ib_uverbs_flow_spec_hdr);
  	kern_spec_mask = kern_spec_val + kern_filter_sz;
  
  	return ib_uverbs_kern_spec_to_ib_spec_filter(kern_spec->type,
  						     kern_spec_mask,
  						     kern_spec_val,
  						     kern_filter_sz, ib_spec);
  }
  
  static int kern_spec_to_ib_spec(struct uverbs_attr_bundle *attrs,
  				struct ib_uverbs_flow_spec *kern_spec,
  				union ib_flow_spec *ib_spec,
  				struct ib_uflow_resources *uflow_res)
  {
  	if (kern_spec->reserved)
  		return -EINVAL;
  
  	if (kern_spec->type >= IB_FLOW_SPEC_ACTION_TAG)
  		return kern_spec_to_ib_spec_action(attrs, kern_spec, ib_spec,
  						   uflow_res);
  	else
  		return kern_spec_to_ib_spec_filter(kern_spec, ib_spec);
  }
  
  static int ib_uverbs_ex_create_wq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_create_wq cmd;
  	struct ib_uverbs_ex_create_wq_resp resp = {};
  	struct ib_uwq_object           *obj;
  	int err = 0;
  	struct ib_cq *cq;
  	struct ib_pd *pd;
  	struct ib_wq *wq;
  	struct ib_wq_init_attr wq_init_attr = {};
  	struct ib_device *ib_dev;
  
  	err = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (err)
  		return err;
  
  	if (cmd.comp_mask)
  		return -EOPNOTSUPP;
  
  	obj = (struct ib_uwq_object *)uobj_alloc(UVERBS_OBJECT_WQ, attrs,
  						 &ib_dev);
  	if (IS_ERR(obj))
  		return PTR_ERR(obj);
  
  	pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd.pd_handle, attrs);
  	if (!pd) {
  		err = -EINVAL;
  		goto err_uobj;
  	}
  
  	cq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ, cmd.cq_handle, attrs);
  	if (!cq) {
  		err = -EINVAL;
  		goto err_put_pd;
  	}
  
  	wq_init_attr.cq = cq;
  	wq_init_attr.max_sge = cmd.max_sge;
  	wq_init_attr.max_wr = cmd.max_wr;
  	wq_init_attr.wq_context = attrs->ufile;
  	wq_init_attr.wq_type = cmd.wq_type;
  	wq_init_attr.event_handler = ib_uverbs_wq_event_handler;
  	wq_init_attr.create_flags = cmd.create_flags;
  	obj->uevent.events_reported = 0;
  	INIT_LIST_HEAD(&obj->uevent.event_list);
  
  	wq = pd->device->ops.create_wq(pd, &wq_init_attr, &attrs->driver_udata);
  	if (IS_ERR(wq)) {
  		err = PTR_ERR(wq);
  		goto err_put_cq;
  	}
  
  	wq->uobject = &obj->uevent.uobject;
  	obj->uevent.uobject.object = wq;
  	wq->wq_type = wq_init_attr.wq_type;
  	wq->cq = cq;
  	wq->pd = pd;
  	wq->device = pd->device;
  	wq->wq_context = wq_init_attr.wq_context;
  	atomic_set(&wq->usecnt, 0);
  	atomic_inc(&pd->usecnt);
  	atomic_inc(&cq->usecnt);
  	wq->uobject = &obj->uevent.uobject;
  	obj->uevent.uobject.object = wq;
  
  	memset(&resp, 0, sizeof(resp));
  	resp.wq_handle = obj->uevent.uobject.id;
  	resp.max_sge = wq_init_attr.max_sge;
  	resp.max_wr = wq_init_attr.max_wr;
  	resp.wqn = wq->wq_num;
  	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
  	err = uverbs_response(attrs, &resp, sizeof(resp));
  	if (err)
  		goto err_copy;
  
  	uobj_put_obj_read(pd);
  	uobj_put_obj_read(cq);
  	return uobj_alloc_commit(&obj->uevent.uobject);
  
  err_copy:
  	ib_destroy_wq(wq);
  err_put_cq:
  	uobj_put_obj_read(cq);
  err_put_pd:
  	uobj_put_obj_read(pd);
  err_uobj:
  	uobj_alloc_abort(&obj->uevent.uobject);
  
  	return err;
  }
  
  static int ib_uverbs_ex_destroy_wq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_destroy_wq	cmd;
  	struct ib_uverbs_ex_destroy_wq_resp	resp = {};
  	struct ib_uobject		*uobj;
  	struct ib_uwq_object		*obj;
  	int				ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (cmd.comp_mask)
  		return -EOPNOTSUPP;
  
  	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
  	uobj = uobj_get_destroy(UVERBS_OBJECT_WQ, cmd.wq_handle, attrs);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	obj = container_of(uobj, struct ib_uwq_object, uevent.uobject);
  	resp.events_reported = obj->uevent.events_reported;
  
  	uobj_put_destroy(uobj);
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_ex_modify_wq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_modify_wq cmd;
  	struct ib_wq *wq;
  	struct ib_wq_attr wq_attr = {};
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (!cmd.attr_mask)
  		return -EINVAL;
  
  	if (cmd.attr_mask > (IB_WQ_STATE | IB_WQ_CUR_STATE | IB_WQ_FLAGS))
  		return -EINVAL;
  
  	wq = uobj_get_obj_read(wq, UVERBS_OBJECT_WQ, cmd.wq_handle, attrs);
  	if (!wq)
  		return -EINVAL;
  
  	wq_attr.curr_wq_state = cmd.curr_wq_state;
  	wq_attr.wq_state = cmd.wq_state;
  	if (cmd.attr_mask & IB_WQ_FLAGS) {
  		wq_attr.flags = cmd.flags;
  		wq_attr.flags_mask = cmd.flags_mask;
  	}
  	ret = wq->device->ops.modify_wq(wq, &wq_attr, cmd.attr_mask,
  					&attrs->driver_udata);
  	uobj_put_obj_read(wq);
  	return ret;
  }
  
  static int ib_uverbs_ex_create_rwq_ind_table(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_create_rwq_ind_table cmd;
  	struct ib_uverbs_ex_create_rwq_ind_table_resp  resp = {};
  	struct ib_uobject		  *uobj;
  	int err;
  	struct ib_rwq_ind_table_init_attr init_attr = {};
  	struct ib_rwq_ind_table *rwq_ind_tbl;
  	struct ib_wq	**wqs = NULL;
  	u32 *wqs_handles = NULL;
  	struct ib_wq	*wq = NULL;
  	int i, j, num_read_wqs;
  	u32 num_wq_handles;
  	struct uverbs_req_iter iter;
  	struct ib_device *ib_dev;
  
  	err = uverbs_request_start(attrs, &iter, &cmd, sizeof(cmd));
  	if (err)
  		return err;
  
  	if (cmd.comp_mask)
  		return -EOPNOTSUPP;
  
  	if (cmd.log_ind_tbl_size > IB_USER_VERBS_MAX_LOG_IND_TBL_SIZE)
  		return -EINVAL;
  
  	num_wq_handles = 1 << cmd.log_ind_tbl_size;
  	wqs_handles = kcalloc(num_wq_handles, sizeof(*wqs_handles),
  			      GFP_KERNEL);
  	if (!wqs_handles)
  		return -ENOMEM;
  
  	err = uverbs_request_next(&iter, wqs_handles,
  				  num_wq_handles * sizeof(__u32));
  	if (err)
  		goto err_free;
  
  	err = uverbs_request_finish(&iter);
  	if (err)
  		goto err_free;
  
  	wqs = kcalloc(num_wq_handles, sizeof(*wqs), GFP_KERNEL);
  	if (!wqs) {
  		err = -ENOMEM;
  		goto  err_free;
  	}
  
  	for (num_read_wqs = 0; num_read_wqs < num_wq_handles;
  			num_read_wqs++) {
  		wq = uobj_get_obj_read(wq, UVERBS_OBJECT_WQ,
  				       wqs_handles[num_read_wqs], attrs);
  		if (!wq) {
  			err = -EINVAL;
  			goto put_wqs;
  		}
  
  		wqs[num_read_wqs] = wq;
  	}
  
  	uobj = uobj_alloc(UVERBS_OBJECT_RWQ_IND_TBL, attrs, &ib_dev);
  	if (IS_ERR(uobj)) {
  		err = PTR_ERR(uobj);
  		goto put_wqs;
  	}
  
  	init_attr.log_ind_tbl_size = cmd.log_ind_tbl_size;
  	init_attr.ind_tbl = wqs;
  
  	rwq_ind_tbl = ib_dev->ops.create_rwq_ind_table(ib_dev, &init_attr,
  						       &attrs->driver_udata);
  
  	if (IS_ERR(rwq_ind_tbl)) {
  		err = PTR_ERR(rwq_ind_tbl);
  		goto err_uobj;
  	}
  
  	rwq_ind_tbl->ind_tbl = wqs;
  	rwq_ind_tbl->log_ind_tbl_size = init_attr.log_ind_tbl_size;
  	rwq_ind_tbl->uobject = uobj;
  	uobj->object = rwq_ind_tbl;
  	rwq_ind_tbl->device = ib_dev;
  	atomic_set(&rwq_ind_tbl->usecnt, 0);
  
  	for (i = 0; i < num_wq_handles; i++)
  		atomic_inc(&wqs[i]->usecnt);
  
  	resp.ind_tbl_handle = uobj->id;
  	resp.ind_tbl_num = rwq_ind_tbl->ind_tbl_num;
  	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
  
  	err = uverbs_response(attrs, &resp, sizeof(resp));
  	if (err)
  		goto err_copy;
  
  	kfree(wqs_handles);
  
  	for (j = 0; j < num_read_wqs; j++)
  		uobj_put_obj_read(wqs[j]);
  
  	return uobj_alloc_commit(uobj);
  
  err_copy:
  	ib_destroy_rwq_ind_table(rwq_ind_tbl);
  err_uobj:
  	uobj_alloc_abort(uobj);
  put_wqs:
  	for (j = 0; j < num_read_wqs; j++)
  		uobj_put_obj_read(wqs[j]);
  err_free:
  	kfree(wqs_handles);
  	kfree(wqs);
  	return err;
  }
  
  static int ib_uverbs_ex_destroy_rwq_ind_table(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_destroy_rwq_ind_table cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (cmd.comp_mask)
  		return -EOPNOTSUPP;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_RWQ_IND_TBL,
  				    cmd.ind_tbl_handle, attrs);
  }
  
  static int ib_uverbs_ex_create_flow(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_flow	  cmd;
  	struct ib_uverbs_create_flow_resp resp;
  	struct ib_uobject		  *uobj;
  	struct ib_flow			  *flow_id;
  	struct ib_uverbs_flow_attr	  *kern_flow_attr;
  	struct ib_flow_attr		  *flow_attr;
  	struct ib_qp			  *qp;
  	struct ib_uflow_resources	  *uflow_res;
  	struct ib_uverbs_flow_spec_hdr	  *kern_spec;
  	struct uverbs_req_iter iter;
  	int err;
  	void *ib_spec;
  	int i;
  	struct ib_device *ib_dev;
  
  	err = uverbs_request_start(attrs, &iter, &cmd, sizeof(cmd));
  	if (err)
  		return err;
  
  	if (cmd.comp_mask)
  		return -EINVAL;
  
  	if (!capable(CAP_NET_RAW))
  		return -EPERM;
  
  	if (cmd.flow_attr.flags >= IB_FLOW_ATTR_FLAGS_RESERVED)
  		return -EINVAL;
  
  	if ((cmd.flow_attr.flags & IB_FLOW_ATTR_FLAGS_DONT_TRAP) &&
  	    ((cmd.flow_attr.type == IB_FLOW_ATTR_ALL_DEFAULT) ||
  	     (cmd.flow_attr.type == IB_FLOW_ATTR_MC_DEFAULT)))
  		return -EINVAL;
  
  	if (cmd.flow_attr.num_of_specs > IB_FLOW_SPEC_SUPPORT_LAYERS)
  		return -EINVAL;
  
  	if (cmd.flow_attr.size >
  	    (cmd.flow_attr.num_of_specs * sizeof(struct ib_uverbs_flow_spec)))
  		return -EINVAL;
  
  	if (cmd.flow_attr.reserved[0] ||
  	    cmd.flow_attr.reserved[1])
  		return -EINVAL;
  
  	if (cmd.flow_attr.num_of_specs) {
  		kern_flow_attr = kmalloc(sizeof(*kern_flow_attr) + cmd.flow_attr.size,
  					 GFP_KERNEL);
  		if (!kern_flow_attr)
  			return -ENOMEM;
  
  		*kern_flow_attr = cmd.flow_attr;
  		err = uverbs_request_next(&iter, &kern_flow_attr->flow_specs,
  					  cmd.flow_attr.size);
  		if (err)
  			goto err_free_attr;
  	} else {
  		kern_flow_attr = &cmd.flow_attr;
  	}
  
  	err = uverbs_request_finish(&iter);
  	if (err)
  		goto err_free_attr;
  
  	uobj = uobj_alloc(UVERBS_OBJECT_FLOW, attrs, &ib_dev);
  	if (IS_ERR(uobj)) {
  		err = PTR_ERR(uobj);
  		goto err_free_attr;
  	}
  
  	qp = uobj_get_obj_read(qp, UVERBS_OBJECT_QP, cmd.qp_handle, attrs);
  	if (!qp) {
  		err = -EINVAL;
  		goto err_uobj;
  	}
  
  	if (qp->qp_type != IB_QPT_UD && qp->qp_type != IB_QPT_RAW_PACKET) {
  		err = -EINVAL;
  		goto err_put;
  	}
  
  	flow_attr = kzalloc(struct_size(flow_attr, flows,
  				cmd.flow_attr.num_of_specs), GFP_KERNEL);
  	if (!flow_attr) {
  		err = -ENOMEM;
  		goto err_put;
  	}
  	uflow_res = flow_resources_alloc(cmd.flow_attr.num_of_specs);
  	if (!uflow_res) {
  		err = -ENOMEM;
  		goto err_free_flow_attr;
  	}
  
  	flow_attr->type = kern_flow_attr->type;
  	flow_attr->priority = kern_flow_attr->priority;
  	flow_attr->num_of_specs = kern_flow_attr->num_of_specs;
  	flow_attr->port = kern_flow_attr->port;
  	flow_attr->flags = kern_flow_attr->flags;
  	flow_attr->size = sizeof(*flow_attr);
  
  	kern_spec = kern_flow_attr->flow_specs;
  	ib_spec = flow_attr + 1;
  	for (i = 0; i < flow_attr->num_of_specs &&
  			cmd.flow_attr.size >= sizeof(*kern_spec) &&
  			cmd.flow_attr.size >= kern_spec->size;
  	     i++) {
  		err = kern_spec_to_ib_spec(
  				attrs, (struct ib_uverbs_flow_spec *)kern_spec,
  				ib_spec, uflow_res);
  		if (err)
  			goto err_free;
  
  		flow_attr->size +=
  			((union ib_flow_spec *) ib_spec)->size;
  		cmd.flow_attr.size -= kern_spec->size;
  		kern_spec = ((void *)kern_spec) + kern_spec->size;
  		ib_spec += ((union ib_flow_spec *) ib_spec)->size;
  	}
  	if (cmd.flow_attr.size || (i != flow_attr->num_of_specs)) {
  		pr_warn("create flow failed, flow %d: %d bytes left from uverb cmd\n",
  			i, cmd.flow_attr.size);
  		err = -EINVAL;
  		goto err_free;
  	}
  
  	flow_id = qp->device->ops.create_flow(
  		qp, flow_attr, IB_FLOW_DOMAIN_USER, &attrs->driver_udata);
  
  	if (IS_ERR(flow_id)) {
  		err = PTR_ERR(flow_id);
  		goto err_free;
  	}
  
  	ib_set_flow(uobj, flow_id, qp, qp->device, uflow_res);
  
  	memset(&resp, 0, sizeof(resp));
  	resp.flow_handle = uobj->id;
  
  	err = uverbs_response(attrs, &resp, sizeof(resp));
  	if (err)
  		goto err_copy;
  
  	uobj_put_obj_read(qp);
  	kfree(flow_attr);
  	if (cmd.flow_attr.num_of_specs)
  		kfree(kern_flow_attr);
  	return uobj_alloc_commit(uobj);
  err_copy:
  	if (!qp->device->ops.destroy_flow(flow_id))
  		atomic_dec(&qp->usecnt);
  err_free:
  	ib_uverbs_flow_resources_free(uflow_res);
  err_free_flow_attr:
  	kfree(flow_attr);
  err_put:
  	uobj_put_obj_read(qp);
  err_uobj:
  	uobj_alloc_abort(uobj);
  err_free_attr:
  	if (cmd.flow_attr.num_of_specs)
  		kfree(kern_flow_attr);
  	return err;
  }
  
  static int ib_uverbs_ex_destroy_flow(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_destroy_flow	cmd;
  	int				ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (cmd.comp_mask)
  		return -EINVAL;
  
  	return uobj_perform_destroy(UVERBS_OBJECT_FLOW, cmd.flow_handle, attrs);
  }
  
  static int __uverbs_create_xsrq(struct uverbs_attr_bundle *attrs,
  				struct ib_uverbs_create_xsrq *cmd,
  				struct ib_udata *udata)
  {
  	struct ib_uverbs_create_srq_resp resp;
  	struct ib_usrq_object           *obj;
  	struct ib_pd                    *pd;
  	struct ib_srq                   *srq;
  	struct ib_uobject               *uninitialized_var(xrcd_uobj);
  	struct ib_srq_init_attr          attr;
  	int ret;
  	struct ib_device *ib_dev;
  
  	obj = (struct ib_usrq_object *)uobj_alloc(UVERBS_OBJECT_SRQ, attrs,
  						  &ib_dev);
  	if (IS_ERR(obj))
  		return PTR_ERR(obj);
  
  	if (cmd->srq_type == IB_SRQT_TM)
  		attr.ext.tag_matching.max_num_tags = cmd->max_num_tags;
  
  	if (cmd->srq_type == IB_SRQT_XRC) {
  		xrcd_uobj = uobj_get_read(UVERBS_OBJECT_XRCD, cmd->xrcd_handle,
  					  attrs);
  		if (IS_ERR(xrcd_uobj)) {
  			ret = -EINVAL;
  			goto err;
  		}
  
  		attr.ext.xrc.xrcd = (struct ib_xrcd *)xrcd_uobj->object;
  		if (!attr.ext.xrc.xrcd) {
  			ret = -EINVAL;
  			goto err_put_xrcd;
  		}
  
  		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
  		atomic_inc(&obj->uxrcd->refcnt);
  	}
  
  	if (ib_srq_has_cq(cmd->srq_type)) {
  		attr.ext.cq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ,
  						cmd->cq_handle, attrs);
  		if (!attr.ext.cq) {
  			ret = -EINVAL;
  			goto err_put_xrcd;
  		}
  	}
  
  	pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd->pd_handle, attrs);
  	if (!pd) {
  		ret = -EINVAL;
  		goto err_put_cq;
  	}
  
  	attr.event_handler  = ib_uverbs_srq_event_handler;
  	attr.srq_context    = attrs->ufile;
  	attr.srq_type       = cmd->srq_type;
  	attr.attr.max_wr    = cmd->max_wr;
  	attr.attr.max_sge   = cmd->max_sge;
  	attr.attr.srq_limit = cmd->srq_limit;
  
  	obj->uevent.events_reported = 0;
  	INIT_LIST_HEAD(&obj->uevent.event_list);
  
  	srq = pd->device->ops.create_srq(pd, &attr, udata);
  	if (IS_ERR(srq)) {
  		ret = PTR_ERR(srq);
  		goto err_put;
  	}
  
  	srq->device        = pd->device;
  	srq->pd            = pd;
  	srq->srq_type	   = cmd->srq_type;
  	srq->uobject       = &obj->uevent.uobject;
  	srq->event_handler = attr.event_handler;
  	srq->srq_context   = attr.srq_context;
  
  	if (ib_srq_has_cq(cmd->srq_type)) {
  		srq->ext.cq       = attr.ext.cq;
  		atomic_inc(&attr.ext.cq->usecnt);
  	}
  
  	if (cmd->srq_type == IB_SRQT_XRC) {
  		srq->ext.xrc.xrcd = attr.ext.xrc.xrcd;
  		atomic_inc(&attr.ext.xrc.xrcd->usecnt);
  	}
  
  	atomic_inc(&pd->usecnt);
  	atomic_set(&srq->usecnt, 0);
  
  	obj->uevent.uobject.object = srq;
  	obj->uevent.uobject.user_handle = cmd->user_handle;
  
  	memset(&resp, 0, sizeof resp);
  	resp.srq_handle = obj->uevent.uobject.id;
  	resp.max_wr     = attr.attr.max_wr;
  	resp.max_sge    = attr.attr.max_sge;
  	if (cmd->srq_type == IB_SRQT_XRC)
  		resp.srqn = srq->ext.xrc.srq_num;
  
  	ret = uverbs_response(attrs, &resp, sizeof(resp));
  	if (ret)
  		goto err_copy;
  
  	if (cmd->srq_type == IB_SRQT_XRC)
  		uobj_put_read(xrcd_uobj);
  
  	if (ib_srq_has_cq(cmd->srq_type))
  		uobj_put_obj_read(attr.ext.cq);
  
  	uobj_put_obj_read(pd);
  	return uobj_alloc_commit(&obj->uevent.uobject);
  
  err_copy:
  	ib_destroy_srq(srq);
  
  err_put:
  	uobj_put_obj_read(pd);
  
  err_put_cq:
  	if (ib_srq_has_cq(cmd->srq_type))
  		uobj_put_obj_read(attr.ext.cq);
  
  err_put_xrcd:
  	if (cmd->srq_type == IB_SRQT_XRC) {
  		atomic_dec(&obj->uxrcd->refcnt);
  		uobj_put_read(xrcd_uobj);
  	}
  
  err:
  	uobj_alloc_abort(&obj->uevent.uobject);
  	return ret;
  }
  
  static int ib_uverbs_create_srq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_srq      cmd;
  	struct ib_uverbs_create_xsrq     xcmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	memset(&xcmd, 0, sizeof(xcmd));
  	xcmd.response	 = cmd.response;
  	xcmd.user_handle = cmd.user_handle;
  	xcmd.srq_type	 = IB_SRQT_BASIC;
  	xcmd.pd_handle	 = cmd.pd_handle;
  	xcmd.max_wr	 = cmd.max_wr;
  	xcmd.max_sge	 = cmd.max_sge;
  	xcmd.srq_limit	 = cmd.srq_limit;
  
  	return __uverbs_create_xsrq(attrs, &xcmd, &attrs->driver_udata);
  }
  
  static int ib_uverbs_create_xsrq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_create_xsrq     cmd;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	return __uverbs_create_xsrq(attrs, &cmd, &attrs->driver_udata);
  }
  
  static int ib_uverbs_modify_srq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_modify_srq cmd;
  	struct ib_srq              *srq;
  	struct ib_srq_attr          attr;
  	int                         ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	srq = uobj_get_obj_read(srq, UVERBS_OBJECT_SRQ, cmd.srq_handle, attrs);
  	if (!srq)
  		return -EINVAL;
  
  	attr.max_wr    = cmd.max_wr;
  	attr.srq_limit = cmd.srq_limit;
  
  	ret = srq->device->ops.modify_srq(srq, &attr, cmd.attr_mask,
  					  &attrs->driver_udata);
  
  	uobj_put_obj_read(srq);
  
  	return ret;
  }
  
  static int ib_uverbs_query_srq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_query_srq      cmd;
  	struct ib_uverbs_query_srq_resp resp;
  	struct ib_srq_attr              attr;
  	struct ib_srq                   *srq;
  	int                             ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	srq = uobj_get_obj_read(srq, UVERBS_OBJECT_SRQ, cmd.srq_handle, attrs);
  	if (!srq)
  		return -EINVAL;
  
  	ret = ib_query_srq(srq, &attr);
  
  	uobj_put_obj_read(srq);
  
  	if (ret)
  		return ret;
  
  	memset(&resp, 0, sizeof resp);
  
  	resp.max_wr    = attr.max_wr;
  	resp.max_sge   = attr.max_sge;
  	resp.srq_limit = attr.srq_limit;
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_destroy_srq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_destroy_srq      cmd;
  	struct ib_uverbs_destroy_srq_resp resp;
  	struct ib_uobject		 *uobj;
  	struct ib_uevent_object        	 *obj;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	uobj = uobj_get_destroy(UVERBS_OBJECT_SRQ, cmd.srq_handle, attrs);
  	if (IS_ERR(uobj))
  		return PTR_ERR(uobj);
  
  	obj = container_of(uobj, struct ib_uevent_object, uobject);
  	memset(&resp, 0, sizeof(resp));
  	resp.events_reported = obj->events_reported;
  
  	uobj_put_destroy(uobj);
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_ex_query_device(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_query_device_resp resp = {};
  	struct ib_uverbs_ex_query_device  cmd;
  	struct ib_device_attr attr = {0};
  	struct ib_ucontext *ucontext;
  	struct ib_device *ib_dev;
  	int err;
  
  	ucontext = ib_uverbs_get_ucontext(attrs);
  	if (IS_ERR(ucontext))
  		return PTR_ERR(ucontext);
  	ib_dev = ucontext->device;
  
  	err = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (err)
  		return err;
  
  	if (cmd.comp_mask)
  		return -EINVAL;
  
  	if (cmd.reserved)
  		return -EINVAL;
  
  	err = ib_dev->ops.query_device(ib_dev, &attr, &attrs->driver_udata);
  	if (err)
  		return err;
  
  	copy_query_dev_fields(ucontext, &resp.base, &attr);
  
  	resp.odp_caps.general_caps = attr.odp_caps.general_caps;
  	resp.odp_caps.per_transport_caps.rc_odp_caps =
  		attr.odp_caps.per_transport_caps.rc_odp_caps;
  	resp.odp_caps.per_transport_caps.uc_odp_caps =
  		attr.odp_caps.per_transport_caps.uc_odp_caps;
  	resp.odp_caps.per_transport_caps.ud_odp_caps =
  		attr.odp_caps.per_transport_caps.ud_odp_caps;
  	resp.xrc_odp_caps = attr.odp_caps.per_transport_caps.xrc_odp_caps;
  
  	resp.timestamp_mask = attr.timestamp_mask;
  	resp.hca_core_clock = attr.hca_core_clock;
  	resp.device_cap_flags_ex = attr.device_cap_flags;
  	resp.rss_caps.supported_qpts = attr.rss_caps.supported_qpts;
  	resp.rss_caps.max_rwq_indirection_tables =
  		attr.rss_caps.max_rwq_indirection_tables;
  	resp.rss_caps.max_rwq_indirection_table_size =
  		attr.rss_caps.max_rwq_indirection_table_size;
  	resp.max_wq_type_rq = attr.max_wq_type_rq;
  	resp.raw_packet_caps = attr.raw_packet_caps;
  	resp.tm_caps.max_rndv_hdr_size	= attr.tm_caps.max_rndv_hdr_size;
  	resp.tm_caps.max_num_tags	= attr.tm_caps.max_num_tags;
  	resp.tm_caps.max_ops		= attr.tm_caps.max_ops;
  	resp.tm_caps.max_sge		= attr.tm_caps.max_sge;
  	resp.tm_caps.flags		= attr.tm_caps.flags;
  	resp.cq_moderation_caps.max_cq_moderation_count  =
  		attr.cq_caps.max_cq_moderation_count;
  	resp.cq_moderation_caps.max_cq_moderation_period =
  		attr.cq_caps.max_cq_moderation_period;
  	resp.max_dm_size = attr.max_dm_size;
  	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
  
  	return uverbs_response(attrs, &resp, sizeof(resp));
  }
  
  static int ib_uverbs_ex_modify_cq(struct uverbs_attr_bundle *attrs)
  {
  	struct ib_uverbs_ex_modify_cq cmd;
  	struct ib_cq *cq;
  	int ret;
  
  	ret = uverbs_request(attrs, &cmd, sizeof(cmd));
  	if (ret)
  		return ret;
  
  	if (!cmd.attr_mask || cmd.reserved)
  		return -EINVAL;
  
  	if (cmd.attr_mask > IB_CQ_MODERATE)
  		return -EOPNOTSUPP;
  
  	cq = uobj_get_obj_read(cq, UVERBS_OBJECT_CQ, cmd.cq_handle, attrs);
  	if (!cq)
  		return -EINVAL;
  
  	ret = rdma_set_cq_moderation(cq, cmd.attr.cq_count, cmd.attr.cq_period);
  
  	uobj_put_obj_read(cq);
  
  	return ret;
  }
  
  /*
   * Describe the input structs for write(). Some write methods have an input
   * only struct, most have an input and output. If the struct has an output then
   * the 'response' u64 must be the first field in the request structure.
   *
   * If udata is present then both the request and response structs have a
   * trailing driver_data flex array. In this case the size of the base struct
   * cannot be changed.
   */
  #define offsetof_after(_struct, _member)                                       \
  	(offsetof(_struct, _member) + sizeof(((_struct *)NULL)->_member))
  
  #define UAPI_DEF_WRITE_IO(req, resp)                                           \
  	.write.has_resp = 1 +                                                  \
  			  BUILD_BUG_ON_ZERO(offsetof(req, response) != 0) +    \
  			  BUILD_BUG_ON_ZERO(sizeof(((req *)0)->response) !=    \
  					    sizeof(u64)),                      \
  	.write.req_size = sizeof(req), .write.resp_size = sizeof(resp)
  
  #define UAPI_DEF_WRITE_I(req) .write.req_size = sizeof(req)
  
  #define UAPI_DEF_WRITE_UDATA_IO(req, resp)                                     \
  	UAPI_DEF_WRITE_IO(req, resp),                                          \
  		.write.has_udata =                                             \
  			1 +                                                    \
  			BUILD_BUG_ON_ZERO(offsetof(req, driver_data) !=        \
  					  sizeof(req)) +                       \
  			BUILD_BUG_ON_ZERO(offsetof(resp, driver_data) !=       \
  					  sizeof(resp))
  
  #define UAPI_DEF_WRITE_UDATA_I(req)                                            \
  	UAPI_DEF_WRITE_I(req),                                                 \
  		.write.has_udata =                                             \
  			1 + BUILD_BUG_ON_ZERO(offsetof(req, driver_data) !=    \
  					      sizeof(req))
  
  /*
   * The _EX versions are for use with WRITE_EX and allow the last struct member
   * to be specified. Buffers that do not include that member will be rejected.
   */
  #define UAPI_DEF_WRITE_IO_EX(req, req_last_member, resp, resp_last_member)     \
  	.write.has_resp = 1,                                                   \
  	.write.req_size = offsetof_after(req, req_last_member),                \
  	.write.resp_size = offsetof_after(resp, resp_last_member)
  
  #define UAPI_DEF_WRITE_I_EX(req, req_last_member)                              \
  	.write.req_size = offsetof_after(req, req_last_member)
  
  const struct uapi_definition uverbs_def_write_intf[] = {
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_AH,
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_CREATE_AH,
  				     ib_uverbs_create_ah,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_create_ah,
  					     struct ib_uverbs_create_ah_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(create_ah)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DESTROY_AH,
  			ib_uverbs_destroy_ah,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_destroy_ah),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_ah))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_COMP_CHANNEL,
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL,
  			ib_uverbs_create_comp_channel,
  			UAPI_DEF_WRITE_IO(
  				struct ib_uverbs_create_comp_channel,
  				struct ib_uverbs_create_comp_channel_resp))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_CQ,
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_CREATE_CQ,
  				     ib_uverbs_create_cq,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_create_cq,
  					     struct ib_uverbs_create_cq_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(create_cq)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DESTROY_CQ,
  			ib_uverbs_destroy_cq,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_destroy_cq,
  					  struct ib_uverbs_destroy_cq_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_cq)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_POLL_CQ,
  			ib_uverbs_poll_cq,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_poll_cq,
  					  struct ib_uverbs_poll_cq_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(poll_cq)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_REQ_NOTIFY_CQ,
  			ib_uverbs_req_notify_cq,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_req_notify_cq),
  			UAPI_DEF_METHOD_NEEDS_FN(req_notify_cq)),
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_RESIZE_CQ,
  				     ib_uverbs_resize_cq,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_resize_cq,
  					     struct ib_uverbs_resize_cq_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(resize_cq)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_CREATE_CQ,
  			ib_uverbs_ex_create_cq,
  			UAPI_DEF_WRITE_IO_EX(struct ib_uverbs_ex_create_cq,
  					     reserved,
  					     struct ib_uverbs_ex_create_cq_resp,
  					     response_length),
  			UAPI_DEF_METHOD_NEEDS_FN(create_cq)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_MODIFY_CQ,
  			ib_uverbs_ex_modify_cq,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_ex_modify_cq),
  			UAPI_DEF_METHOD_NEEDS_FN(create_cq))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_DEVICE,
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_GET_CONTEXT,
  				     ib_uverbs_get_context,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_get_context,
  					     struct ib_uverbs_get_context_resp)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_QUERY_DEVICE,
  			ib_uverbs_query_device,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_query_device,
  					  struct ib_uverbs_query_device_resp)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_QUERY_PORT,
  			ib_uverbs_query_port,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_query_port,
  					  struct ib_uverbs_query_port_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(query_port)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_QUERY_DEVICE,
  			ib_uverbs_ex_query_device,
  			UAPI_DEF_WRITE_IO_EX(
  				struct ib_uverbs_ex_query_device,
  				reserved,
  				struct ib_uverbs_ex_query_device_resp,
  				response_length),
  			UAPI_DEF_METHOD_NEEDS_FN(query_device)),
  		UAPI_DEF_OBJ_NEEDS_FN(alloc_ucontext),
  		UAPI_DEF_OBJ_NEEDS_FN(dealloc_ucontext)),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_FLOW,
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_CREATE_FLOW,
  			ib_uverbs_ex_create_flow,
  			UAPI_DEF_WRITE_IO_EX(struct ib_uverbs_create_flow,
  					     flow_attr,
  					     struct ib_uverbs_create_flow_resp,
  					     flow_handle),
  			UAPI_DEF_METHOD_NEEDS_FN(create_flow)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_DESTROY_FLOW,
  			ib_uverbs_ex_destroy_flow,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_destroy_flow),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_flow))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_MR,
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_DEREG_MR,
  				     ib_uverbs_dereg_mr,
  				     UAPI_DEF_WRITE_I(struct ib_uverbs_dereg_mr),
  				     UAPI_DEF_METHOD_NEEDS_FN(dereg_mr)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_REG_MR,
  			ib_uverbs_reg_mr,
  			UAPI_DEF_WRITE_UDATA_IO(struct ib_uverbs_reg_mr,
  						struct ib_uverbs_reg_mr_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(reg_user_mr)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_REREG_MR,
  			ib_uverbs_rereg_mr,
  			UAPI_DEF_WRITE_UDATA_IO(struct ib_uverbs_rereg_mr,
  						struct ib_uverbs_rereg_mr_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(rereg_user_mr))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_MW,
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_ALLOC_MW,
  			ib_uverbs_alloc_mw,
  			UAPI_DEF_WRITE_UDATA_IO(struct ib_uverbs_alloc_mw,
  						struct ib_uverbs_alloc_mw_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(alloc_mw)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DEALLOC_MW,
  			ib_uverbs_dealloc_mw,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_dealloc_mw),
  			UAPI_DEF_METHOD_NEEDS_FN(dealloc_mw))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_PD,
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_ALLOC_PD,
  			ib_uverbs_alloc_pd,
  			UAPI_DEF_WRITE_UDATA_IO(struct ib_uverbs_alloc_pd,
  						struct ib_uverbs_alloc_pd_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(alloc_pd)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DEALLOC_PD,
  			ib_uverbs_dealloc_pd,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_dealloc_pd),
  			UAPI_DEF_METHOD_NEEDS_FN(dealloc_pd))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_QP,
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_ATTACH_MCAST,
  			ib_uverbs_attach_mcast,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_attach_mcast),
  			UAPI_DEF_METHOD_NEEDS_FN(attach_mcast),
  			UAPI_DEF_METHOD_NEEDS_FN(detach_mcast)),
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_CREATE_QP,
  				     ib_uverbs_create_qp,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_create_qp,
  					     struct ib_uverbs_create_qp_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(create_qp)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DESTROY_QP,
  			ib_uverbs_destroy_qp,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_destroy_qp,
  					  struct ib_uverbs_destroy_qp_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_qp)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DETACH_MCAST,
  			ib_uverbs_detach_mcast,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_detach_mcast),
  			UAPI_DEF_METHOD_NEEDS_FN(detach_mcast)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_MODIFY_QP,
  			ib_uverbs_modify_qp,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_modify_qp),
  			UAPI_DEF_METHOD_NEEDS_FN(modify_qp)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_POST_RECV,
  			ib_uverbs_post_recv,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_post_recv,
  					  struct ib_uverbs_post_recv_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(post_recv)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_POST_SEND,
  			ib_uverbs_post_send,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_post_send,
  					  struct ib_uverbs_post_send_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(post_send)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_QUERY_QP,
  			ib_uverbs_query_qp,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_query_qp,
  					  struct ib_uverbs_query_qp_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(query_qp)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_CREATE_QP,
  			ib_uverbs_ex_create_qp,
  			UAPI_DEF_WRITE_IO_EX(struct ib_uverbs_ex_create_qp,
  					     comp_mask,
  					     struct ib_uverbs_ex_create_qp_resp,
  					     response_length),
  			UAPI_DEF_METHOD_NEEDS_FN(create_qp)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_MODIFY_QP,
  			ib_uverbs_ex_modify_qp,
  			UAPI_DEF_WRITE_IO_EX(struct ib_uverbs_ex_modify_qp,
  					     base,
  					     struct ib_uverbs_ex_modify_qp_resp,
  					     response_length),
  			UAPI_DEF_METHOD_NEEDS_FN(modify_qp))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_RWQ_IND_TBL,
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL,
  			ib_uverbs_ex_create_rwq_ind_table,
  			UAPI_DEF_WRITE_IO_EX(
  				struct ib_uverbs_ex_create_rwq_ind_table,
  				log_ind_tbl_size,
  				struct ib_uverbs_ex_create_rwq_ind_table_resp,
  				ind_tbl_num),
  			UAPI_DEF_METHOD_NEEDS_FN(create_rwq_ind_table)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL,
  			ib_uverbs_ex_destroy_rwq_ind_table,
  			UAPI_DEF_WRITE_I(
  				struct ib_uverbs_ex_destroy_rwq_ind_table),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_rwq_ind_table))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_WQ,
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_CREATE_WQ,
  			ib_uverbs_ex_create_wq,
  			UAPI_DEF_WRITE_IO_EX(struct ib_uverbs_ex_create_wq,
  					     max_sge,
  					     struct ib_uverbs_ex_create_wq_resp,
  					     wqn),
  			UAPI_DEF_METHOD_NEEDS_FN(create_wq)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_DESTROY_WQ,
  			ib_uverbs_ex_destroy_wq,
  			UAPI_DEF_WRITE_IO_EX(struct ib_uverbs_ex_destroy_wq,
  					     wq_handle,
  					     struct ib_uverbs_ex_destroy_wq_resp,
  					     reserved),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_wq)),
  		DECLARE_UVERBS_WRITE_EX(
  			IB_USER_VERBS_EX_CMD_MODIFY_WQ,
  			ib_uverbs_ex_modify_wq,
  			UAPI_DEF_WRITE_I_EX(struct ib_uverbs_ex_modify_wq,
  					    curr_wq_state),
  			UAPI_DEF_METHOD_NEEDS_FN(modify_wq))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_SRQ,
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_CREATE_SRQ,
  				     ib_uverbs_create_srq,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_create_srq,
  					     struct ib_uverbs_create_srq_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(create_srq)),
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_CREATE_XSRQ,
  				     ib_uverbs_create_xsrq,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_create_xsrq,
  					     struct ib_uverbs_create_srq_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(create_srq)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_DESTROY_SRQ,
  			ib_uverbs_destroy_srq,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_destroy_srq,
  					  struct ib_uverbs_destroy_srq_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(destroy_srq)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_MODIFY_SRQ,
  			ib_uverbs_modify_srq,
  			UAPI_DEF_WRITE_UDATA_I(struct ib_uverbs_modify_srq),
  			UAPI_DEF_METHOD_NEEDS_FN(modify_srq)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_POST_SRQ_RECV,
  			ib_uverbs_post_srq_recv,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_post_srq_recv,
  					  struct ib_uverbs_post_srq_recv_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(post_srq_recv)),
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_QUERY_SRQ,
  			ib_uverbs_query_srq,
  			UAPI_DEF_WRITE_IO(struct ib_uverbs_query_srq,
  					  struct ib_uverbs_query_srq_resp),
  			UAPI_DEF_METHOD_NEEDS_FN(query_srq))),
  
  	DECLARE_UVERBS_OBJECT(
  		UVERBS_OBJECT_XRCD,
  		DECLARE_UVERBS_WRITE(
  			IB_USER_VERBS_CMD_CLOSE_XRCD,
  			ib_uverbs_close_xrcd,
  			UAPI_DEF_WRITE_I(struct ib_uverbs_close_xrcd),
  			UAPI_DEF_METHOD_NEEDS_FN(dealloc_xrcd)),
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_OPEN_QP,
  				     ib_uverbs_open_qp,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_open_qp,
  					     struct ib_uverbs_create_qp_resp)),
  		DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_OPEN_XRCD,
  				     ib_uverbs_open_xrcd,
  				     UAPI_DEF_WRITE_UDATA_IO(
  					     struct ib_uverbs_open_xrcd,
  					     struct ib_uverbs_open_xrcd_resp),
  				     UAPI_DEF_METHOD_NEEDS_FN(alloc_xrcd))),
  
  	{},
  };
  