uverbs_cmd.c

linux-2.6.15.6

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: uverbs_cmd.c 2708 2005-06-24 17:27:21Z roland $
 */

#include <linux/file.h>
#include <linux/fs.h>

#include <asm/uaccess.h>

#include "uverbs.h"

#define INIT_UDATA(udata, ibuf, obuf, ilen, olen)			\
	do {								\
		(udata)->inbuf  = (void __user *) (ibuf);		\
		(udata)->outbuf = (void __user *) (obuf);		\
		(udata)->inlen  = (ilen);				\
		(udata)->outlen = (olen);				\
	} while (0)

ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
			      const char __user *buf,
			      int in_len, int out_len)
{
	struct ib_uverbs_get_context      cmd;
	struct ib_uverbs_get_context_resp resp;
	struct ib_udata                   udata;
	struct ib_device                 *ibdev = file->device->ib_dev;
	struct ib_ucontext		 *ucontext;
	struct file			 *filp;
	int ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	down(&file->mutex);

	if (file->ucontext) {
		ret = -EINVAL;
		goto err;
	}

	INIT_UDATA(&udata, buf + sizeof cmd,
		   (unsigned long) cmd.response + sizeof resp,
		   in_len - sizeof cmd, out_len - sizeof resp);

	ucontext = ibdev->alloc_ucontext(ibdev, &udata);
	if (IS_ERR(ucontext))
		return PTR_ERR(file->ucontext);

	ucontext->device = ibdev;
	INIT_LIST_HEAD(&ucontext->pd_list);
	INIT_LIST_HEAD(&ucontext->mr_list);
	INIT_LIST_HEAD(&ucontext->mw_list);
	INIT_LIST_HEAD(&ucontext->cq_list);
	INIT_LIST_HEAD(&ucontext->qp_list);
	INIT_LIST_HEAD(&ucontext->srq_list);
	INIT_LIST_HEAD(&ucontext->ah_list);

	resp.num_comp_vectors = file->device->num_comp_vectors;

	filp = ib_uverbs_alloc_event_file(file, 1, &resp.async_fd);
	if (IS_ERR(filp)) {
		ret = PTR_ERR(filp);
		goto err_free;
	}

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp)) {
		ret = -EFAULT;
		goto err_file;
	}

	file->async_file = filp->private_data;

	INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
			      ib_uverbs_event_handler);
	ret = ib_register_event_handler(&file->event_handler);
	if (ret)
		goto err_file;

	kref_get(&file->async_file->ref);
	kref_get(&file->ref);
	file->ucontext = ucontext;

	fd_install(resp.async_fd, filp);

	up(&file->mutex);

	return in_len;

err_file:
	put_unused_fd(resp.async_fd);
	fput(filp);

err_free:
	ibdev->dealloc_ucontext(ucontext);

err:
	up(&file->mutex);
	return ret;
}

ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
			       const char __user *buf,
			       int in_len, int out_len)
{
	struct ib_uverbs_query_device      cmd;
	struct ib_uverbs_query_device_resp resp;
	struct ib_device_attr              attr;
	int                                ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	ret = ib_query_device(file->device->ib_dev, &attr);
	if (ret)
		return ret;

	memset(&resp, 0, sizeof resp);

	resp.fw_ver 		       = attr.fw_ver;
	resp.node_guid 		       = attr.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 	       = attr.device_cap_flags;
	resp.max_sge 		       = attr.max_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	       = file->device->ib_dev->phys_port_cnt;

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp))
		return -EFAULT;

	return in_len;
}

ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
			     const char __user *buf,
			     int in_len, int out_len)
{
	struct ib_uverbs_query_port      cmd;
	struct ib_uverbs_query_port_resp resp;
	struct ib_port_attr              attr;
	int                              ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
	if (ret)
		return ret;

	memset(&resp, 0, sizeof resp);

	resp.state 	     = attr.state;
	resp.max_mtu 	     = attr.max_mtu;
	resp.active_mtu      = attr.active_mtu;
	resp.gid_tbl_len     = attr.gid_tbl_len;
	resp.port_cap_flags  = attr.port_cap_flags;
	resp.max_msg_sz      = attr.max_msg_sz;
	resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
	resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
	resp.pkey_tbl_len    = attr.pkey_tbl_len;
	resp.lid 	     = attr.lid;
	resp.sm_lid 	     = attr.sm_lid;
	resp.lmc 	     = attr.lmc;
	resp.max_vl_num      = attr.max_vl_num;
	resp.sm_sl 	     = attr.sm_sl;
	resp.subnet_timeout  = attr.subnet_timeout;
	resp.init_type_reply = attr.init_type_reply;
	resp.active_width    = attr.active_width;
	resp.active_speed    = attr.active_speed;
	resp.phys_state      = attr.phys_state;

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp))
		return -EFAULT;

	return in_len;
}

ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
			   const char __user *buf,
			   int in_len, int out_len)
{
	struct ib_uverbs_alloc_pd      cmd;
	struct ib_uverbs_alloc_pd_resp resp;
	struct ib_udata                udata;
	struct ib_uobject             *uobj;
	struct ib_pd                  *pd;
	int                            ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	INIT_UDATA(&udata, buf + sizeof cmd,
		   (unsigned long) cmd.response + sizeof resp,
		   in_len - sizeof cmd, out_len - sizeof resp);

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

	uobj->context = file->ucontext;

	pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
					    file->ucontext, &udata);
	if (IS_ERR(pd)) {
		ret = PTR_ERR(pd);
		goto err;
	}

	pd->device  = file->device->ib_dev;
	pd->uobject = uobj;
	atomic_set(&pd->usecnt, 0);

	down(&ib_uverbs_idr_mutex);

retry:
	if (!idr_pre_get(&ib_uverbs_pd_idr, GFP_KERNEL)) {
		ret = -ENOMEM;
		goto err_up;
	}

	ret = idr_get_new(&ib_uverbs_pd_idr, pd, &uobj->id);

	if (ret == -EAGAIN)
		goto retry;
	if (ret)
		goto err_up;

	memset(&resp, 0, sizeof resp);
	resp.pd_handle = uobj->id;

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp)) {
		ret = -EFAULT;
		goto err_idr;
	}

	down(&file->mutex);
	list_add_tail(&uobj->list, &file->ucontext->pd_list);
	up(&file->mutex);

	up(&ib_uverbs_idr_mutex);

	return in_len;

err_idr:
	idr_remove(&ib_uverbs_pd_idr, uobj->id);

err_up:
	up(&ib_uverbs_idr_mutex);
	ib_dealloc_pd(pd);

err:
	kfree(uobj);
	return ret;
}

ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
			     const char __user *buf,
			     int in_len, int out_len)
{
	struct ib_uverbs_dealloc_pd cmd;
	struct ib_pd               *pd;
	struct ib_uobject          *uobj;
	int                         ret = -EINVAL;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	down(&ib_uverbs_idr_mutex);

	pd = idr_find(&ib_uverbs_pd_idr, cmd.pd_handle);
	if (!pd || pd->uobject->context != file->ucontext)
		goto out;

	uobj = pd->uobject;

	ret = ib_dealloc_pd(pd);
	if (ret)
		goto out;

	idr_remove(&ib_uverbs_pd_idr, cmd.pd_handle);

	down(&file->mutex);
	list_del(&uobj->list);
	up(&file->mutex);

	kfree(uobj);

out:
	up(&ib_uverbs_idr_mutex);

	return ret ? ret : in_len;
}

ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
			 const char __user *buf, int in_len,
			 int out_len)
{
	struct ib_uverbs_reg_mr      cmd;
	struct ib_uverbs_reg_mr_resp resp;
	struct ib_udata              udata;
	struct ib_umem_object       *obj;
	struct ib_pd                *pd;
	struct ib_mr                *mr;
	int                          ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	INIT_UDATA(&udata, buf + sizeof cmd,
		   (unsigned long) cmd.response + sizeof resp,
		   in_len - sizeof cmd, out_len - sizeof resp);

	if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
		return -EINVAL;

	/*
	 * Local write permission is required if remote write or
	 * remote atomic permission is also requested.
	 */
	if (cmd.access_flags & (IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_REMOTE_WRITE) &&
	    !(cmd.access_flags & IB_ACCESS_LOCAL_WRITE))
		return -EINVAL;

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

	obj->uobject.context = file->ucontext;

	/*
	 * We ask for writable memory if any access flags other than
	 * "remote read" are set.  "Local write" and "remote write"
	 * obviously require write access.  "Remote atomic" can do
	 * things like fetch and add, which will modify memory, and
	 * "MW bind" can change permissions by binding a window.
	 */
	ret = ib_umem_get(file->device->ib_dev, &obj->umem,
			  (void *) (unsigned long) cmd.start, cmd.length,
			  !!(cmd.access_flags & ~IB_ACCESS_REMOTE_READ));
	if (ret)
		goto err_free;

	obj->umem.virt_base = cmd.hca_va;

	down(&ib_uverbs_idr_mutex);

	pd = idr_find(&ib_uverbs_pd_idr, cmd.pd_handle);
	if (!pd || pd->uobject->context != file->ucontext) {
		ret = -EINVAL;
		goto err_up;
	}

	if (!pd->device->reg_user_mr) {
		ret = -ENOSYS;
		goto err_up;
	}

	mr = pd->device->reg_user_mr(pd, &obj->umem, cmd.access_flags, &udata);
	if (IS_ERR(mr)) {
		ret = PTR_ERR(mr);
		goto err_up;
	}

	mr->device  = pd->device;
	mr->pd      = pd;
	mr->uobject = &obj->uobject;
	atomic_inc(&pd->usecnt);
	atomic_set(&mr->usecnt, 0);

	memset(&resp, 0, sizeof resp);
	resp.lkey = mr->lkey;
	resp.rkey = mr->rkey;

retry:
	if (!idr_pre_get(&ib_uverbs_mr_idr, GFP_KERNEL)) {
		ret = -ENOMEM;
		goto err_unreg;
	}

	ret = idr_get_new(&ib_uverbs_mr_idr, mr, &obj->uobject.id);

	if (ret == -EAGAIN)
		goto retry;
	if (ret)
		goto err_unreg;

	resp.mr_handle = obj->uobject.id;

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp)) {
		ret = -EFAULT;
		goto err_idr;
	}

	down(&file->mutex);
	list_add_tail(&obj->uobject.list, &file->ucontext->mr_list);
	up(&file->mutex);

	up(&ib_uverbs_idr_mutex);

	return in_len;

err_idr:
	idr_remove(&ib_uverbs_mr_idr, obj->uobject.id);

err_unreg:
	ib_dereg_mr(mr);

err_up:
	up(&ib_uverbs_idr_mutex);

	ib_umem_release(file->device->ib_dev, &obj->umem);

err_free:
	kfree(obj);
	return ret;
}

ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
			   const char __user *buf, int in_len,
			   int out_len)
{
	struct ib_uverbs_dereg_mr cmd;
	struct ib_mr             *mr;
	struct ib_umem_object    *memobj;
	int                       ret = -EINVAL;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	down(&ib_uverbs_idr_mutex);

	mr = idr_find(&ib_uverbs_mr_idr, cmd.mr_handle);
	if (!mr || mr->uobject->context != file->ucontext)
		goto out;

	memobj = container_of(mr->uobject, struct ib_umem_object, uobject);

	ret = ib_dereg_mr(mr);
	if (ret)
		goto out;

	idr_remove(&ib_uverbs_mr_idr, cmd.mr_handle);

	down(&file->mutex);
	list_del(&memobj->uobject.list);
	up(&file->mutex);

	ib_umem_release(file->device->ib_dev, &memobj->umem);
	kfree(memobj);

out:
	up(&ib_uverbs_idr_mutex);

	return ret ? ret : in_len;
}

ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
				      const char __user *buf, int in_len,
				      int out_len)
{
	struct ib_uverbs_create_comp_channel	   cmd;
	struct ib_uverbs_create_comp_channel_resp  resp;
	struct file				  *filp;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	filp = ib_uverbs_alloc_event_file(file, 0, &resp.fd);
	if (IS_ERR(filp))
		return PTR_ERR(filp);

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp)) {
		put_unused_fd(resp.fd);
		fput(filp);
		return -EFAULT;
	}

	fd_install(resp.fd, filp);
	return in_len;
}

ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
			    const char __user *buf, int in_len,
			    int out_len)
{
	struct ib_uverbs_create_cq      cmd;
	struct ib_uverbs_create_cq_resp resp;
	struct ib_udata                 udata;
	struct ib_ucq_object           *uobj;
	struct ib_uverbs_event_file    *ev_file = NULL;
	struct ib_cq                   *cq;
	int                             ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	INIT_UDATA(&udata, buf + sizeof cmd,
		   (unsigned long) cmd.response + sizeof resp,
		   in_len - sizeof cmd, out_len - sizeof resp);

	if (cmd.comp_vector >= file->device->num_comp_vectors)
		return -EINVAL;

	if (cmd.comp_channel >= 0)
		ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);

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

	uobj->uobject.user_handle   = cmd.user_handle;
	uobj->uobject.context       = file->ucontext;
	uobj->uverbs_file	    = file;
	uobj->comp_events_reported  = 0;
	uobj->async_events_reported = 0;