ef24f05897
When two handlers used the same object in the old schema, we blocked the process in the kernel. The new schema just returns -EBUSY. This could lead to different behaviour in applications between the old schema and the new schema. In most cases, using such handlers concurrently could lead to crashing the process. For example, if thread A destroys a QP and thread B modifies it, we could have the destruction happens before the modification. In this case, we are accessing freed memory which could lead to crashing the process. This is true for most cases. However, attaching and detaching a multicast address from QP concurrently is safe. Therefore, we preserve the original behaviour by adding a lock there. Linux commit: f48b726920d96dcd1860df06143bdea7d6d7dcc3 MFC after: 1 week Sponsored by: Mellanox Technologies
303 lines
9.5 KiB
C
303 lines
9.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
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*
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* Copyright (c) 2005 Topspin Communications. All rights reserved.
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* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
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* Copyright (c) 2005 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* $FreeBSD$
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*/
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#ifndef UVERBS_H
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#define UVERBS_H
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#include <linux/kref.h>
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#include <linux/idr.h>
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#include <linux/mutex.h>
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#include <linux/completion.h>
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#include <linux/cdev.h>
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#include <linux/srcu.h>
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#include <linux/rcupdate.h>
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#include <linux/rbtree.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_umem.h>
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#include <rdma/ib_user_verbs.h>
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#define INIT_UDATA(udata, ibuf, obuf, ilen, olen) \
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do { \
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(udata)->inbuf = (const void __user *) (ibuf); \
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(udata)->outbuf = (void __user *) (obuf); \
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(udata)->inlen = (ilen); \
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(udata)->outlen = (olen); \
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} while (0)
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#define INIT_UDATA_BUF_OR_NULL(udata, ibuf, obuf, ilen, olen) \
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do { \
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(udata)->inbuf = (ilen) ? (const void __user *) (ibuf) : NULL; \
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(udata)->outbuf = (olen) ? (void __user *) (obuf) : NULL; \
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(udata)->inlen = (ilen); \
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(udata)->outlen = (olen); \
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} while (0)
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/*
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* Our lifetime rules for these structs are the following:
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*
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* struct ib_uverbs_device: One reference is held by the module and
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* released in ib_uverbs_remove_one(). Another reference is taken by
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* ib_uverbs_open() each time the character special file is opened,
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* and released in ib_uverbs_release_file() when the file is released.
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*
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* struct ib_uverbs_file: One reference is held by the VFS and
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* released when the file is closed. Another reference is taken when
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* an asynchronous event queue file is created and released when the
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* event file is closed.
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*
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* struct ib_uverbs_event_file: One reference is held by the VFS and
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* released when the file is closed. For asynchronous event files,
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* another reference is held by the corresponding main context file
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* and released when that file is closed. For completion event files,
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* a reference is taken when a CQ is created that uses the file, and
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* released when the CQ is destroyed.
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*/
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struct ib_uverbs_device {
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atomic_t refcount;
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int num_comp_vectors;
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struct completion comp;
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struct device *dev;
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struct ib_device __rcu *ib_dev;
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int devnum;
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struct cdev cdev;
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struct rb_root xrcd_tree;
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struct mutex xrcd_tree_mutex;
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struct kobject kobj;
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struct srcu_struct disassociate_srcu;
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struct mutex lists_mutex; /* protect lists */
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struct list_head uverbs_file_list;
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struct list_head uverbs_events_file_list;
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};
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struct ib_uverbs_event_file {
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struct kref ref;
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int is_async;
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struct ib_uverbs_file *uverbs_file;
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spinlock_t lock;
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int is_closed;
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wait_queue_head_t poll_wait;
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struct fasync_struct *async_queue;
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struct list_head event_list;
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struct list_head list;
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};
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struct ib_uverbs_file {
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struct kref ref;
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struct mutex mutex;
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struct mutex cleanup_mutex; /* protect cleanup */
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struct ib_uverbs_device *device;
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struct ib_ucontext *ucontext;
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struct ib_event_handler event_handler;
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struct ib_uverbs_event_file *async_file;
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struct list_head list;
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int is_closed;
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};
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struct ib_uverbs_event {
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union {
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struct ib_uverbs_async_event_desc async;
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struct ib_uverbs_comp_event_desc comp;
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} desc;
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struct list_head list;
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struct list_head obj_list;
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u32 *counter;
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};
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struct ib_uverbs_mcast_entry {
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struct list_head list;
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union ib_gid gid;
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u16 lid;
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};
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struct ib_uevent_object {
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struct ib_uobject uobject;
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struct list_head event_list;
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u32 events_reported;
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};
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struct ib_uxrcd_object {
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struct ib_uobject uobject;
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atomic_t refcnt;
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};
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struct ib_usrq_object {
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struct ib_uevent_object uevent;
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struct ib_uxrcd_object *uxrcd;
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};
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struct ib_uqp_object {
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struct ib_uevent_object uevent;
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/* lock for mcast list */
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struct mutex mcast_lock;
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struct list_head mcast_list;
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struct ib_uxrcd_object *uxrcd;
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};
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struct ib_uwq_object {
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struct ib_uevent_object uevent;
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};
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struct ib_ucq_object {
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struct ib_uobject uobject;
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struct ib_uverbs_file *uverbs_file;
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struct list_head comp_list;
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struct list_head async_list;
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u32 comp_events_reported;
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u32 async_events_reported;
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};
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extern spinlock_t ib_uverbs_idr_lock;
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extern struct idr ib_uverbs_pd_idr;
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extern struct idr ib_uverbs_mr_idr;
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extern struct idr ib_uverbs_mw_idr;
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extern struct idr ib_uverbs_ah_idr;
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extern struct idr ib_uverbs_cq_idr;
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extern struct idr ib_uverbs_qp_idr;
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extern struct idr ib_uverbs_srq_idr;
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extern struct idr ib_uverbs_xrcd_idr;
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extern struct idr ib_uverbs_rule_idr;
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extern struct idr ib_uverbs_wq_idr;
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extern struct idr ib_uverbs_rwq_ind_tbl_idr;
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void idr_remove_uobj(struct idr *idp, struct ib_uobject *uobj);
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struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
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struct ib_device *ib_dev,
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int is_async);
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void ib_uverbs_free_async_event_file(struct ib_uverbs_file *uverbs_file);
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struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd);
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void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
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struct ib_uverbs_event_file *ev_file,
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struct ib_ucq_object *uobj);
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void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
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struct ib_uevent_object *uobj);
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void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
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void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_event_handler(struct ib_event_handler *handler,
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struct ib_event *event);
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void ib_uverbs_dealloc_xrcd(struct ib_uverbs_device *dev, struct ib_xrcd *xrcd);
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int uverbs_dealloc_mw(struct ib_mw *mw);
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struct ib_uverbs_flow_spec {
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union {
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union {
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struct ib_uverbs_flow_spec_hdr hdr;
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struct {
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__u32 type;
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__u16 size;
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__u16 reserved;
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};
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};
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struct ib_uverbs_flow_spec_eth eth;
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struct ib_uverbs_flow_spec_ipv4 ipv4;
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struct ib_uverbs_flow_spec_tcp_udp tcp_udp;
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struct ib_uverbs_flow_spec_ipv6 ipv6;
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};
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};
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#define IB_UVERBS_DECLARE_CMD(name) \
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ssize_t ib_uverbs_##name(struct ib_uverbs_file *file, \
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struct ib_device *ib_dev, \
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const char __user *buf, int in_len, \
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int out_len)
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IB_UVERBS_DECLARE_CMD(get_context);
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IB_UVERBS_DECLARE_CMD(query_device);
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IB_UVERBS_DECLARE_CMD(query_port);
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IB_UVERBS_DECLARE_CMD(alloc_pd);
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IB_UVERBS_DECLARE_CMD(dealloc_pd);
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IB_UVERBS_DECLARE_CMD(reg_mr);
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IB_UVERBS_DECLARE_CMD(rereg_mr);
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IB_UVERBS_DECLARE_CMD(dereg_mr);
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IB_UVERBS_DECLARE_CMD(alloc_mw);
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IB_UVERBS_DECLARE_CMD(dealloc_mw);
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IB_UVERBS_DECLARE_CMD(create_comp_channel);
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IB_UVERBS_DECLARE_CMD(create_cq);
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IB_UVERBS_DECLARE_CMD(resize_cq);
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IB_UVERBS_DECLARE_CMD(poll_cq);
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IB_UVERBS_DECLARE_CMD(req_notify_cq);
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IB_UVERBS_DECLARE_CMD(destroy_cq);
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IB_UVERBS_DECLARE_CMD(create_qp);
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IB_UVERBS_DECLARE_CMD(open_qp);
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IB_UVERBS_DECLARE_CMD(query_qp);
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IB_UVERBS_DECLARE_CMD(modify_qp);
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IB_UVERBS_DECLARE_CMD(destroy_qp);
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IB_UVERBS_DECLARE_CMD(post_send);
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IB_UVERBS_DECLARE_CMD(post_recv);
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IB_UVERBS_DECLARE_CMD(post_srq_recv);
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IB_UVERBS_DECLARE_CMD(create_ah);
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IB_UVERBS_DECLARE_CMD(destroy_ah);
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IB_UVERBS_DECLARE_CMD(attach_mcast);
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IB_UVERBS_DECLARE_CMD(detach_mcast);
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IB_UVERBS_DECLARE_CMD(create_srq);
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IB_UVERBS_DECLARE_CMD(modify_srq);
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IB_UVERBS_DECLARE_CMD(query_srq);
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IB_UVERBS_DECLARE_CMD(destroy_srq);
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IB_UVERBS_DECLARE_CMD(create_xsrq);
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IB_UVERBS_DECLARE_CMD(open_xrcd);
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IB_UVERBS_DECLARE_CMD(close_xrcd);
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#define IB_UVERBS_DECLARE_EX_CMD(name) \
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int ib_uverbs_ex_##name(struct ib_uverbs_file *file, \
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struct ib_device *ib_dev, \
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struct ib_udata *ucore, \
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struct ib_udata *uhw)
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IB_UVERBS_DECLARE_EX_CMD(create_flow);
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IB_UVERBS_DECLARE_EX_CMD(destroy_flow);
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IB_UVERBS_DECLARE_EX_CMD(query_device);
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IB_UVERBS_DECLARE_EX_CMD(create_cq);
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IB_UVERBS_DECLARE_EX_CMD(create_qp);
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IB_UVERBS_DECLARE_EX_CMD(create_wq);
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IB_UVERBS_DECLARE_EX_CMD(modify_wq);
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IB_UVERBS_DECLARE_EX_CMD(destroy_wq);
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IB_UVERBS_DECLARE_EX_CMD(create_rwq_ind_table);
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IB_UVERBS_DECLARE_EX_CMD(destroy_rwq_ind_table);
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#endif /* UVERBS_H */
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