diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/lnet/module.c')
-rw-r--r-- | drivers/staging/lustre/lnet/lnet/module.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/lnet/module.c b/drivers/staging/lustre/lnet/lnet/module.c new file mode 100644 index 000000000..72b7fbc83 --- /dev/null +++ b/drivers/staging/lustre/lnet/lnet/module.c @@ -0,0 +1,155 @@ +/* + * 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.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2012, 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" + +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; + + LNET_MUTEX_LOCK(&lnet_config_mutex); + + if (!the_lnet.ln_niinit_self) { + rc = LNetNIInit(LUSTRE_SRV_LNET_PID); + if (rc >= 0) { + the_lnet.ln_niinit_self = 1; + rc = 0; + } + } + + LNET_MUTEX_UNLOCK(&lnet_config_mutex); + return rc; +} + +static int +lnet_unconfigure(void) +{ + int refcount; + + LNET_MUTEX_LOCK(&lnet_config_mutex); + + if (the_lnet.ln_niinit_self) { + the_lnet.ln_niinit_self = 0; + LNetNIFini(); + } + + LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex); + refcount = the_lnet.ln_refcount; + LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex); + + LNET_MUTEX_UNLOCK(&lnet_config_mutex); + return (refcount == 0) ? 0 : -EBUSY; +} + +static int +lnet_ioctl(unsigned int cmd, struct libcfs_ioctl_data *data) +{ + int rc; + + switch (cmd) { + case IOC_LIBCFS_CONFIGURE: + return lnet_configure(NULL); + + case IOC_LIBCFS_UNCONFIGURE: + return lnet_unconfigure(); + + 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, data); + LNetNIFini(); + } + return rc; + } +} + +static DECLARE_IOCTL_HANDLER(lnet_ioctl_handler, lnet_ioctl); + +static int __init +init_lnet(void) +{ + int rc; + + mutex_init(&lnet_config_mutex); + + rc = LNetInit(); + if (rc != 0) { + CERROR("LNetInit: error %d\n", rc); + return rc; + } + + rc = libcfs_register_ioctl(&lnet_ioctl_handler); + LASSERT(rc == 0); + + 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 +fini_lnet(void) +{ + int rc; + + rc = libcfs_deregister_ioctl(&lnet_ioctl_handler); + LASSERT(rc == 0); + + LNetFini(); +} + +MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>"); +MODULE_DESCRIPTION("Portals v3.1"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0.0"); + +module_init(init_lnet); +module_exit(fini_lnet); |