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, 2015, 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 #include "../../include/linux/lnet/lib-dlc.h"
  40
  41 static int config_on_load;
  42 module_param(config_on_load, int, 0444);
  43 MODULE_PARM_DESC(config_on_load, "configure network at module load");
  44
  45 static struct mutex lnet_config_mutex;
  46
  47 static int
  48 lnet_configure(void *arg)
  49 {
  50         /* 'arg' only there so I can be passed to cfs_create_thread() */
  51         int rc = 0;
  52
  53         mutex_lock(&lnet_config_mutex);
  54
  55         if (!the_lnet.ln_niinit_self) {
  56                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
  57                 if (rc >= 0) {
  58                         the_lnet.ln_niinit_self = 1;
  59                         rc = 0;
  60                 }
  61         }
  62
  63         mutex_unlock(&lnet_config_mutex);
  64         return rc;
  65 }
  66
  67 static int
  68 lnet_unconfigure(void)
  69 {
  70         int refcount;
  71
  72         mutex_lock(&lnet_config_mutex);
  73
  74         if (the_lnet.ln_niinit_self) {
  75                 the_lnet.ln_niinit_self = 0;
  76                 LNetNIFini();
  77         }
  78
  79         mutex_lock(&the_lnet.ln_api_mutex);
  80         refcount = the_lnet.ln_refcount;
  81         mutex_unlock(&the_lnet.ln_api_mutex);
  82
  83         mutex_unlock(&lnet_config_mutex);
  84         return !refcount ? 0 : -EBUSY;
  85 }
  86
  87 static int
  88 lnet_dyn_configure(struct libcfs_ioctl_hdr *hdr)
  89 {
  90         struct lnet_ioctl_config_data *conf =
  91                 (struct lnet_ioctl_config_data *)hdr;
  92         int rc;
  93
  94         if (conf->cfg_hdr.ioc_len < sizeof(*conf))
  95                 return -EINVAL;
  96
  97         mutex_lock(&lnet_config_mutex);
  98         if (!the_lnet.ln_niinit_self) {
  99                 rc = -EINVAL;
 100                 goto out_unlock;
 101         }
 102         rc = lnet_dyn_add_ni(LUSTRE_SRV_LNET_PID,
 103                              conf->cfg_config_u.cfg_net.net_intf,
 104                              conf->cfg_config_u.cfg_net.net_peer_timeout,
 105                              conf->cfg_config_u.cfg_net.net_peer_tx_credits,
 106                              conf->cfg_config_u.cfg_net.net_peer_rtr_credits,
 107                              conf->cfg_config_u.cfg_net.net_max_tx_credits);
 108 out_unlock:
 109         mutex_unlock(&lnet_config_mutex);
 110
 111         return rc;
 112 }
 113
 114 static int
 115 lnet_dyn_unconfigure(struct libcfs_ioctl_hdr *hdr)
 116 {
 117         struct lnet_ioctl_config_data *conf =
 118                 (struct lnet_ioctl_config_data *)hdr;
 119         int rc;
 120
 121         if (conf->cfg_hdr.ioc_len < sizeof(*conf))
 122                 return -EINVAL;
 123
 124         mutex_lock(&lnet_config_mutex);
 125         if (!the_lnet.ln_niinit_self) {
 126                 rc = -EINVAL;
 127                 goto out_unlock;
 128         }
 129         rc = lnet_dyn_del_ni(conf->cfg_net);
 130 out_unlock:
 131         mutex_unlock(&lnet_config_mutex);
 132
 133         return rc;
 134 }
 135
 136 static int
 137 lnet_ioctl(unsigned int cmd, struct libcfs_ioctl_hdr *hdr)
 138 {
 139         int rc;
 140
 141         switch (cmd) {
 142         case IOC_LIBCFS_CONFIGURE: {
 143                 struct libcfs_ioctl_data *data =
 144                         (struct libcfs_ioctl_data *)hdr;
 145
 146                 if (data->ioc_hdr.ioc_len < sizeof(*data))
 147                         return -EINVAL;
 148
 149                 the_lnet.ln_nis_from_mod_params = data->ioc_flags;
 150                 return lnet_configure(NULL);
 151         }
 152
 153         case IOC_LIBCFS_UNCONFIGURE:
 154                 return lnet_unconfigure();
 155
 156         case IOC_LIBCFS_ADD_NET:
 157                 return lnet_dyn_configure(hdr);
 158
 159         case IOC_LIBCFS_DEL_NET:
 160                 return lnet_dyn_unconfigure(hdr);
 161
 162         default:
 163                 /*
 164                  * Passing LNET_PID_ANY only gives me a ref if the net is up
 165                  * already; I'll need it to ensure the net can't go down while
 166                  * I'm called into it
 167                  */
 168                 rc = LNetNIInit(LNET_PID_ANY);
 169                 if (rc >= 0) {
 170                         rc = LNetCtl(cmd, hdr);
 171                         LNetNIFini();
 172                 }
 173                 return rc;
 174         }
 175 }
 176
 177 static DECLARE_IOCTL_HANDLER(lnet_ioctl_handler, lnet_ioctl);
 178
 179 static int __init
 180 init_lnet(void)
 181 {
 182         int rc;
 183
 184         mutex_init(&lnet_config_mutex);
 185
 186         rc = lnet_init();
 187         if (rc) {
 188                 CERROR("lnet_init: error %d\n", rc);
 189                 return rc;
 190         }
 191
 192         rc = libcfs_register_ioctl(&lnet_ioctl_handler);
 193         LASSERT(!rc);
 194
 195         if (config_on_load) {
 196                 /*
 197                  * Have to schedule a separate thread to avoid deadlocking
 198                  * in modload
 199                  */
 200                 (void) kthread_run(lnet_configure, NULL, "lnet_initd");
 201         }
 202
 203         return 0;
 204 }
 205
 206 static void __exit
 207 fini_lnet(void)
 208 {
 209         int rc;
 210
 211         rc = libcfs_deregister_ioctl(&lnet_ioctl_handler);
 212         LASSERT(!rc);
 213
 214         lnet_fini();
 215 }
 216
 217 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 218 MODULE_DESCRIPTION("LNet v3.1");
 219 MODULE_LICENSE("GPL");
 220 MODULE_VERSION("1.0.0");
 221
 222 module_init(init_lnet);
 223 module_exit(fini_lnet);