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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_LNET
#include "../../include/linux/lnet/lib-lnet.h"
#include "../../include/linux/lnet/lib-dlc.h"
static int config_on_load;
module_param(config_on_load, int, 0444);
MODULE_PARM_DESC(config_on_load, "configure network at module load");
static struct mutex lnet_config_mutex;
static int
lnet_configure(void *arg)
{
/* 'arg' only there so I can be passed to cfs_create_thread() */
int rc = 0;
mutex_lock(&lnet_config_mutex);
if (!the_lnet.ln_niinit_self) {
rc = try_module_get(THIS_MODULE);
if (rc != 1)
goto out;
rc = LNetNIInit(LNET_PID_LUSTRE);
if (rc >= 0) {
the_lnet.ln_niinit_self = 1;
rc = 0;
} else {
module_put(THIS_MODULE);
}
}
out:
mutex_unlock(&lnet_config_mutex);
return rc;
}
static int
lnet_unconfigure(void)
{
int refcount;
mutex_lock(&lnet_config_mutex);
if (the_lnet.ln_niinit_self) {
the_lnet.ln_niinit_self = 0;
LNetNIFini();
module_put(THIS_MODULE);
}
mutex_lock(&the_lnet.ln_api_mutex);
refcount = the_lnet.ln_refcount;
mutex_unlock(&the_lnet.ln_api_mutex);
mutex_unlock(&lnet_config_mutex);
return !refcount ? 0 : -EBUSY;
}
static int
lnet_dyn_configure(struct libcfs_ioctl_hdr *hdr)
{
struct lnet_ioctl_config_data *conf =
(struct lnet_ioctl_config_data *)hdr;
int rc;
if (conf->cfg_hdr.ioc_len < sizeof(*conf))
return -EINVAL;
mutex_lock(&lnet_config_mutex);
if (!the_lnet.ln_niinit_self) {
rc = -EINVAL;
goto out_unlock;
}
rc = lnet_dyn_add_ni(LNET_PID_LUSTRE, conf);
out_unlock:
mutex_unlock(&lnet_config_mutex);
return rc;
}
static int
lnet_dyn_unconfigure(struct libcfs_ioctl_hdr *hdr)
{
struct lnet_ioctl_config_data *conf =
(struct lnet_ioctl_config_data *)hdr;
int rc;
if (conf->cfg_hdr.ioc_len < sizeof(*conf))
return -EINVAL;
mutex_lock(&lnet_config_mutex);
if (!the_lnet.ln_niinit_self) {
rc = -EINVAL;
goto out_unlock;
}
rc = lnet_dyn_del_ni(conf->cfg_net);
out_unlock:
mutex_unlock(&lnet_config_mutex);
return rc;
}
static int
lnet_ioctl(unsigned int cmd, struct libcfs_ioctl_hdr *hdr)
{
int rc;
switch (cmd) {
case IOC_LIBCFS_CONFIGURE: {
struct libcfs_ioctl_data *data =
(struct libcfs_ioctl_data *)hdr;
if (data->ioc_hdr.ioc_len < sizeof(*data))
return -EINVAL;
the_lnet.ln_nis_from_mod_params = data->ioc_flags;
return lnet_configure(NULL);
}
case IOC_LIBCFS_UNCONFIGURE:
return lnet_unconfigure();
case IOC_LIBCFS_ADD_NET:
return lnet_dyn_configure(hdr);
case IOC_LIBCFS_DEL_NET:
return lnet_dyn_unconfigure(hdr);
default:
/*
* Passing LNET_PID_ANY only gives me a ref if the net is up
* already; I'll need it to ensure the net can't go down while
* I'm called into it
*/
rc = LNetNIInit(LNET_PID_ANY);
if (rc >= 0) {
rc = LNetCtl(cmd, hdr);
LNetNIFini();
}
return rc;
}
}
static DECLARE_IOCTL_HANDLER(lnet_ioctl_handler, lnet_ioctl);
static int __init lnet_init(void)
{
int rc;
mutex_init(&lnet_config_mutex);
rc = lnet_lib_init();
if (rc) {
CERROR("lnet_lib_init: error %d\n", rc);
return rc;
}
rc = libcfs_register_ioctl(&lnet_ioctl_handler);
LASSERT(!rc);
if (config_on_load) {
/*
* Have to schedule a separate thread to avoid deadlocking
* in modload
*/
(void)kthread_run(lnet_configure, NULL, "lnet_initd");
}
return 0;
}
static void __exit lnet_exit(void)
{
int rc;
rc = libcfs_deregister_ioctl(&lnet_ioctl_handler);
LASSERT(!rc);
lnet_lib_exit();
}
MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
MODULE_DESCRIPTION("Lustre Networking layer");
MODULE_VERSION(LNET_VERSION);
MODULE_LICENSE("GPL");
module_init(lnet_init);
module_exit(lnet_exit);
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