lnet/lnet/module.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LNET
  41 #include <lnet/lib-lnet.h>
  42
  43 static int config_on_load = 0;
  44 CFS_MODULE_PARM(config_on_load, "i", int, 0444,
  45                 "configure network at module load");
  46
  47 static struct semaphore lnet_config_mutex;
  48
  49 int
  50 lnet_configure (void *arg)
  51 {
  52         /* 'arg' only there so I can be passed to cfs_kernel_thread() */
  53         int    rc = 0;
  54
  55         LNET_MUTEX_DOWN(&lnet_config_mutex);
  56
  57         if (!the_lnet.ln_niinit_self) {
  58                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
  59                 if (rc >= 0) {
  60                         the_lnet.ln_niinit_self = 1;
  61                         rc = 0;
  62                 }
  63         }
  64
  65         LNET_MUTEX_UP(&lnet_config_mutex);
  66         return rc;
  67 }
  68
  69 int
  70 lnet_unconfigure (void)
  71 {
  72         int   refcount;
  73
  74         LNET_MUTEX_DOWN(&lnet_config_mutex);
  75
  76         if (the_lnet.ln_niinit_self) {
  77                 the_lnet.ln_niinit_self = 0;
  78                 LNetNIFini();
  79         }
  80
  81         LNET_MUTEX_DOWN(&the_lnet.ln_api_mutex);
  82         refcount = the_lnet.ln_refcount;
  83         LNET_MUTEX_UP(&the_lnet.ln_api_mutex);
  84
  85         LNET_MUTEX_UP(&lnet_config_mutex);
  86         return (refcount == 0) ? 0 : -EBUSY;
  87 }
  88
  89 int
  90 lnet_ioctl(unsigned int cmd, struct libcfs_ioctl_data *data)
  91 {
  92         int   rc;
  93
  94         switch (cmd) {
  95         case IOC_LIBCFS_CONFIGURE:
  96                 return lnet_configure(NULL);
  97
  98         case IOC_LIBCFS_UNCONFIGURE:
  99                 return lnet_unconfigure();
 100
 101         default:
 102                 /* Passing LNET_PID_ANY only gives me a ref if the net is up
 103                  * already; I'll need it to ensure the net can't go down while
 104                  * I'm called into it */
 105                 rc = LNetNIInit(LNET_PID_ANY);
 106                 if (rc >= 0) {
 107                         rc = LNetCtl(cmd, data);
 108                         LNetNIFini();
 109                 }
 110                 return rc;
 111         }
 112 }
 113
 114 DECLARE_IOCTL_HANDLER(lnet_ioctl_handler, lnet_ioctl);
 115
 116 int
 117 init_lnet(void)
 118 {
 119         int                  rc;
 120         ENTRY;
 121
 122         init_mutex(&lnet_config_mutex);
 123
 124         rc = LNetInit();
 125         if (rc != 0) {
 126                 CERROR("LNetInit: error %d\n", rc);
 127                 RETURN(rc);
 128         }
 129
 130         rc = libcfs_register_ioctl(&lnet_ioctl_handler);
 131         LASSERT (rc == 0);
 132
 133         if (config_on_load) {
 134                 /* Have to schedule a separate thread to avoid deadlocking
 135                  * in modload */
 136                 (void) cfs_kernel_thread(lnet_configure, NULL, 0);
 137         }
 138
 139         RETURN(0);
 140 }
 141
 142 void
 143 fini_lnet(void)
 144 {
 145         int rc;
 146
 147         rc = libcfs_deregister_ioctl(&lnet_ioctl_handler);
 148         LASSERT (rc == 0);
 149
 150         LNetFini();
 151 }
 152
 153 EXPORT_SYMBOL(lnet_register_lnd);
 154 EXPORT_SYMBOL(lnet_unregister_lnd);
 155
 156 EXPORT_SYMBOL(LNetMEAttach);
 157 EXPORT_SYMBOL(LNetMEInsert);
 158 EXPORT_SYMBOL(LNetMEUnlink);
 159 EXPORT_SYMBOL(LNetEQAlloc);
 160 EXPORT_SYMBOL(LNetMDAttach);
 161 EXPORT_SYMBOL(LNetMDUnlink);
 162 EXPORT_SYMBOL(LNetNIInit);
 163 EXPORT_SYMBOL(LNetNIFini);
 164 EXPORT_SYMBOL(LNetInit);
 165 EXPORT_SYMBOL(LNetFini);
 166 EXPORT_SYMBOL(LNetSnprintHandle);
 167 EXPORT_SYMBOL(LNetPut);
 168 EXPORT_SYMBOL(LNetGet);
 169 EXPORT_SYMBOL(LNetEQWait);
 170 EXPORT_SYMBOL(LNetEQFree);
 171 EXPORT_SYMBOL(LNetEQGet);
 172 EXPORT_SYMBOL(LNetGetId);
 173 EXPORT_SYMBOL(LNetMDBind);
 174 EXPORT_SYMBOL(LNetDist);
 175 EXPORT_SYMBOL(LNetSetAsync);
 176 EXPORT_SYMBOL(LNetCtl);
 177 EXPORT_SYMBOL(LNetSetLazyPortal);
 178 EXPORT_SYMBOL(LNetClearLazyPortal);
 179 EXPORT_SYMBOL(the_lnet);
 180 EXPORT_SYMBOL(lnet_iov_nob);
 181 EXPORT_SYMBOL(lnet_extract_iov);
 182 EXPORT_SYMBOL(lnet_kiov_nob);
 183 EXPORT_SYMBOL(lnet_extract_kiov);
 184 EXPORT_SYMBOL(lnet_copy_iov2iov);
 185 EXPORT_SYMBOL(lnet_copy_iov2kiov);
 186 EXPORT_SYMBOL(lnet_copy_kiov2iov);
 187 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
 188 EXPORT_SYMBOL(lnet_finalize);
 189 EXPORT_SYMBOL(lnet_parse);
 190 EXPORT_SYMBOL(lnet_create_reply_msg);
 191 EXPORT_SYMBOL(lnet_set_reply_msg_len);
 192 EXPORT_SYMBOL(lnet_msgtyp2str);
 193 EXPORT_SYMBOL(lnet_net2ni_locked);
 194
 195 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 196 MODULE_DESCRIPTION("Portals v3.1");
 197 MODULE_LICENSE("GPL");
 198
 199 cfs_module(lnet, "1.0.0", init_lnet, fini_lnet);