drivers/staging/lustre/lnet/lnet/module.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38 #include "../../include/linux/lnet/lib-lnet.h"
  39
  40 static int config_on_load;
  41 module_param(config_on_load, int, 0444);
  42 MODULE_PARM_DESC(config_on_load, "configure network at module load");
  43
  44 static struct mutex lnet_config_mutex;
  45
  46 int
  47 lnet_configure(void *arg)
  48 {
  49         /* 'arg' only there so I can be passed to cfs_create_thread() */
  50         int    rc = 0;
  51
  52         LNET_MUTEX_LOCK(&lnet_config_mutex);
  53
  54         if (!the_lnet.ln_niinit_self) {
  55                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
  56                 if (rc >= 0) {
  57                         the_lnet.ln_niinit_self = 1;
  58                         rc = 0;
  59                 }
  60         }
  61
  62         LNET_MUTEX_UNLOCK(&lnet_config_mutex);
  63         return rc;
  64 }
  65
  66 int
  67 lnet_unconfigure(void)
  68 {
  69         int   refcount;
  70
  71         LNET_MUTEX_LOCK(&lnet_config_mutex);
  72
  73         if (the_lnet.ln_niinit_self) {
  74                 the_lnet.ln_niinit_self = 0;
  75                 LNetNIFini();
  76         }
  77
  78         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
  79         refcount = the_lnet.ln_refcount;
  80         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
  81
  82         LNET_MUTEX_UNLOCK(&lnet_config_mutex);
  83         return (refcount == 0) ? 0 : -EBUSY;
  84 }
  85
  86 int
  87 lnet_ioctl(unsigned int cmd, struct libcfs_ioctl_data *data)
  88 {
  89         int   rc;
  90
  91         switch (cmd) {
  92         case IOC_LIBCFS_CONFIGURE:
  93                 return lnet_configure(NULL);
  94
  95         case IOC_LIBCFS_UNCONFIGURE:
  96                 return lnet_unconfigure();
  97
  98         default:
  99                 /* Passing LNET_PID_ANY only gives me a ref if the net is up
 100                  * already; I'll need it to ensure the net can't go down while
 101                  * I'm called into it */
 102                 rc = LNetNIInit(LNET_PID_ANY);
 103                 if (rc >= 0) {
 104                         rc = LNetCtl(cmd, data);
 105                         LNetNIFini();
 106                 }
 107                 return rc;
 108         }
 109 }
 110
 111 DECLARE_IOCTL_HANDLER(lnet_ioctl_handler, lnet_ioctl);
 112
 113 int
 114 init_lnet(void)
 115 {
 116         int               rc;
 117
 118         mutex_init(&lnet_config_mutex);
 119
 120         rc = LNetInit();
 121         if (rc != 0) {
 122                 CERROR("LNetInit: error %d\n", rc);
 123                 return rc;
 124         }
 125
 126         rc = libcfs_register_ioctl(&lnet_ioctl_handler);
 127         LASSERT(rc == 0);
 128
 129         if (config_on_load) {
 130                 /* Have to schedule a separate thread to avoid deadlocking
 131                  * in modload */
 132                 (void) kthread_run(lnet_configure, NULL, "lnet_initd");
 133         }
 134
 135         return 0;
 136 }
 137
 138 void
 139 fini_lnet(void)
 140 {
 141         int rc;
 142
 143         rc = libcfs_deregister_ioctl(&lnet_ioctl_handler);
 144         LASSERT(rc == 0);
 145
 146         LNetFini();
 147 }
 148
 149 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 150 MODULE_DESCRIPTION("Portals v3.1");
 151 MODULE_LICENSE("GPL");
 152 MODULE_VERSION("1.0.0");
 153
 154 module_init(init_lnet);
 155 module_exit(fini_lnet);