drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21 #include <linux/module.h>
  22 #include <scsi/scsi.h>
  23 #include <scsi/scsi_host.h>
  24 #include <scsi/scsi_device.h>
  25 #include <scsi/scsi_transport.h>
  26 #include <scsi/scsi_transport_iscsi.h>
  27
  28 #define ISCSI_SESSION_ATTRS 20
  29 #define ISCSI_HOST_ATTRS 2
  30
  31 struct iscsi_internal {
  32         struct scsi_transport_template t;
  33         struct iscsi_function_template *fnt;
  34         /*
  35          * We do not have any private or other attrs.
  36          */
  37         struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
  38         struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
  39 };
  40
  41 #define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t)
  42
  43 static DECLARE_TRANSPORT_CLASS(iscsi_transport_class,
  44                                "iscsi_transport",
  45                                NULL,
  46                                NULL,
  47                                NULL);
  48
  49 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
  50                                "iscsi_host",
  51                                NULL,
  52                                NULL,
  53                                NULL);
  54 /*
  55  * iSCSI target and session attrs
  56  */
  57 #define iscsi_session_show_fn(field, format)                            \
  58                                                                         \
  59 static ssize_t                                                          \
  60 show_session_##field(struct class_device *cdev, char *buf)              \
  61 {                                                                       \
  62         struct scsi_target *starget = transport_class_to_starget(cdev); \
  63         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
  64         struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
  65                                                                         \
  66         if (i->fnt->get_##field)                                        \
  67                 i->fnt->get_##field(starget);                           \
  68         return snprintf(buf, 20, format"\n", iscsi_##field(starget));   \
  69 }
  70
  71 #define iscsi_session_rd_attr(field, format)                            \
  72         iscsi_session_show_fn(field, format)                            \
  73 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL);
  74
  75 iscsi_session_rd_attr(tpgt, "%hu");
  76 iscsi_session_rd_attr(tsih, "%2x");
  77 iscsi_session_rd_attr(max_recv_data_segment_len, "%u");
  78 iscsi_session_rd_attr(max_burst_len, "%u");
  79 iscsi_session_rd_attr(first_burst_len, "%u");
  80 iscsi_session_rd_attr(def_time2wait, "%hu");
  81 iscsi_session_rd_attr(def_time2retain, "%hu");
  82 iscsi_session_rd_attr(max_outstanding_r2t, "%hu");
  83 iscsi_session_rd_attr(erl, "%d");
  84
  85
  86 #define iscsi_session_show_bool_fn(field)                               \
  87                                                                         \
  88 static ssize_t                                                          \
  89 show_session_bool_##field(struct class_device *cdev, char *buf)         \
  90 {                                                                       \
  91         struct scsi_target *starget = transport_class_to_starget(cdev); \
  92         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
  93         struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
  94                                                                         \
  95         if (i->fnt->get_##field)                                        \
  96                 i->fnt->get_##field(starget);                           \
  97                                                                         \
  98         if (iscsi_##field(starget))                                     \
  99                 return sprintf(buf, "Yes\n");                           \
 100         return sprintf(buf, "No\n");                                    \
 101 }
 102
 103 #define iscsi_session_rd_bool_attr(field)                               \
 104         iscsi_session_show_bool_fn(field)                               \
 105 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL);
 106
 107 iscsi_session_rd_bool_attr(initial_r2t);
 108 iscsi_session_rd_bool_attr(immediate_data);
 109 iscsi_session_rd_bool_attr(data_pdu_in_order);
 110 iscsi_session_rd_bool_attr(data_sequence_in_order);
 111
 112 #define iscsi_session_show_digest_fn(field)                             \
 113                                                                         \
 114 static ssize_t                                                          \
 115 show_##field(struct class_device *cdev, char *buf)                      \
 116 {                                                                       \
 117         struct scsi_target *starget = transport_class_to_starget(cdev); \
 118         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 119         struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
 120                                                                         \
 121         if (i->fnt->get_##field)                                        \
 122                 i->fnt->get_##field(starget);                           \
 123                                                                         \
 124         if (iscsi_##field(starget))                                     \
 125                 return sprintf(buf, "CRC32C\n");                        \
 126         return sprintf(buf, "None\n");                                  \
 127 }
 128
 129 #define iscsi_session_rd_digest_attr(field)                             \
 130         iscsi_session_show_digest_fn(field)                             \
 131 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 132
 133 iscsi_session_rd_digest_attr(header_digest);
 134 iscsi_session_rd_digest_attr(data_digest);
 135
 136 static ssize_t
 137 show_port(struct class_device *cdev, char *buf)
 138 {
 139         struct scsi_target *starget = transport_class_to_starget(cdev);
 140         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 141         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 142
 143         if (i->fnt->get_port)
 144                 i->fnt->get_port(starget);
 145
 146         return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget)));
 147 }
 148 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
 149
 150 static ssize_t
 151 show_ip_address(struct class_device *cdev, char *buf)
 152 {
 153         struct scsi_target *starget = transport_class_to_starget(cdev);
 154         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 155         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 156
 157         if (i->fnt->get_ip_address)
 158                 i->fnt->get_ip_address(starget);
 159
 160         if (iscsi_addr_type(starget) == AF_INET)
 161                 return sprintf(buf, "%u.%u.%u.%u\n",
 162                                NIPQUAD(iscsi_sin_addr(starget)));
 163         else if(iscsi_addr_type(starget) == AF_INET6)
 164                 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
 165                                NIP6(iscsi_sin6_addr(starget)));
 166         return -EINVAL;
 167 }
 168 static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL);
 169
 170 static ssize_t
 171 show_isid(struct class_device *cdev, char *buf)
 172 {
 173         struct scsi_target *starget = transport_class_to_starget(cdev);
 174         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 175         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 176
 177         if (i->fnt->get_isid)
 178                 i->fnt->get_isid(starget);
 179
 180         return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
 181                        iscsi_isid(starget)[0], iscsi_isid(starget)[1],
 182                        iscsi_isid(starget)[2], iscsi_isid(starget)[3],
 183                        iscsi_isid(starget)[4], iscsi_isid(starget)[5]);
 184 }
 185 static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL);
 186
 187 /*
 188  * This is used for iSCSI names. Normally, we follow
 189  * the transport class convention of having the lld
 190  * set the field, but in these cases the value is
 191  * too large.
 192  */
 193 #define iscsi_session_show_str_fn(field)                                \
 194                                                                         \
 195 static ssize_t                                                          \
 196 show_session_str_##field(struct class_device *cdev, char *buf)          \
 197 {                                                                       \
 198         ssize_t ret = 0;                                                \
 199         struct scsi_target *starget = transport_class_to_starget(cdev); \
 200         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 201         struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
 202                                                                         \
 203         if (i->fnt->get_##field)                                        \
 204                 ret = i->fnt->get_##field(starget, buf, PAGE_SIZE);     \
 205         return ret;                                                     \
 206 }
 207
 208 #define iscsi_session_rd_str_attr(field)                                \
 209         iscsi_session_show_str_fn(field)                                \
 210 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL);
 211
 212 iscsi_session_rd_str_attr(target_name);
 213 iscsi_session_rd_str_attr(target_alias);
 214
 215 /*
 216  * iSCSI host attrs
 217  */
 218
 219 /*
 220  * Again, this is used for iSCSI names. Normally, we follow
 221  * the transport class convention of having the lld set
 222  * the field, but in these cases the value is too large.
 223  */
 224 #define iscsi_host_show_str_fn(field)                                   \
 225                                                                         \
 226 static ssize_t                                                          \
 227 show_host_str_##field(struct class_device *cdev, char *buf)             \
 228 {                                                                       \
 229         int ret = 0;                                                    \
 230         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 231         struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
 232                                                                         \
 233         if (i->fnt->get_##field)                                        \
 234                 ret = i->fnt->get_##field(shost, buf, PAGE_SIZE);       \
 235         return ret;                                                     \
 236 }
 237
 238 #define iscsi_host_rd_str_attr(field)                                   \
 239         iscsi_host_show_str_fn(field)                                   \
 240 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL);
 241
 242 iscsi_host_rd_str_attr(initiator_name);
 243 iscsi_host_rd_str_attr(initiator_alias);
 244
 245 #define SETUP_SESSION_RD_ATTR(field)                                    \
 246         if (i->fnt->show_##field) {                                     \
 247                 i->session_attrs[count] = &class_device_attr_##field;   \
 248                 count++;                                                \
 249         }
 250
 251 #define SETUP_HOST_RD_ATTR(field)                                       \
 252         if (i->fnt->show_##field) {                                     \
 253                 i->host_attrs[count] = &class_device_attr_##field;      \
 254                 count++;                                                \
 255         }
 256
 257 static int iscsi_host_match(struct attribute_container *cont,
 258                           struct device *dev)
 259 {
 260         struct Scsi_Host *shost;
 261         struct iscsi_internal *i;
 262
 263         if (!scsi_is_host_device(dev))
 264                 return 0;
 265
 266         shost = dev_to_shost(dev);
 267         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 268             != &iscsi_host_class.class)
 269                 return 0;
 270
 271         i = to_iscsi_internal(shost->transportt);
 272
 273         return &i->t.host_attrs.ac == cont;
 274 }
 275
 276 static int iscsi_target_match(struct attribute_container *cont,
 277                             struct device *dev)
 278 {
 279         struct Scsi_Host *shost;
 280         struct iscsi_internal *i;
 281
 282         if (!scsi_is_target_device(dev))
 283                 return 0;
 284
 285         shost = dev_to_shost(dev->parent);
 286         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 287             != &iscsi_host_class.class)
 288                 return 0;
 289
 290         i = to_iscsi_internal(shost->transportt);
 291
 292         return &i->t.target_attrs.ac == cont;
 293 }
 294
 295 struct scsi_transport_template *
 296 iscsi_attach_transport(struct iscsi_function_template *fnt)
 297 {
 298         struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
 299                                            GFP_KERNEL);
 300         int count = 0;
 301
 302         if (unlikely(!i))
 303                 return NULL;
 304
 305         memset(i, 0, sizeof(struct iscsi_internal));
 306         i->fnt = fnt;
 307
 308         i->t.target_attrs.ac.attrs = &i->session_attrs[0];
 309         i->t.target_attrs.ac.class = &iscsi_transport_class.class;
 310         i->t.target_attrs.ac.match = iscsi_target_match;
 311         transport_container_register(&i->t.target_attrs);
 312         i->t.target_size = sizeof(struct iscsi_class_session);
 313
 314         SETUP_SESSION_RD_ATTR(tsih);
 315         SETUP_SESSION_RD_ATTR(isid);
 316         SETUP_SESSION_RD_ATTR(header_digest);
 317         SETUP_SESSION_RD_ATTR(data_digest);
 318         SETUP_SESSION_RD_ATTR(target_name);
 319         SETUP_SESSION_RD_ATTR(target_alias);
 320         SETUP_SESSION_RD_ATTR(port);
 321         SETUP_SESSION_RD_ATTR(tpgt);
 322         SETUP_SESSION_RD_ATTR(ip_address);
 323         SETUP_SESSION_RD_ATTR(initial_r2t);
 324         SETUP_SESSION_RD_ATTR(immediate_data);
 325         SETUP_SESSION_RD_ATTR(max_recv_data_segment_len);
 326         SETUP_SESSION_RD_ATTR(max_burst_len);
 327         SETUP_SESSION_RD_ATTR(first_burst_len);
 328         SETUP_SESSION_RD_ATTR(def_time2wait);
 329         SETUP_SESSION_RD_ATTR(def_time2retain);
 330         SETUP_SESSION_RD_ATTR(max_outstanding_r2t);
 331         SETUP_SESSION_RD_ATTR(data_pdu_in_order);
 332         SETUP_SESSION_RD_ATTR(data_sequence_in_order);
 333         SETUP_SESSION_RD_ATTR(erl);
 334
 335         BUG_ON(count > ISCSI_SESSION_ATTRS);
 336         i->session_attrs[count] = NULL;
 337
 338         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
 339         i->t.host_attrs.ac.class = &iscsi_host_class.class;
 340         i->t.host_attrs.ac.match = iscsi_host_match;
 341         transport_container_register(&i->t.host_attrs);
 342         i->t.host_size = 0;
 343
 344         count = 0;
 345         SETUP_HOST_RD_ATTR(initiator_name);
 346         SETUP_HOST_RD_ATTR(initiator_alias);
 347
 348         BUG_ON(count > ISCSI_HOST_ATTRS);
 349         i->host_attrs[count] = NULL;
 350
 351         return &i->t;
 352 }
 353
 354 EXPORT_SYMBOL(iscsi_attach_transport);
 355
 356 void iscsi_release_transport(struct scsi_transport_template *t)
 357 {
 358         struct iscsi_internal *i = to_iscsi_internal(t);
 359
 360         transport_container_unregister(&i->t.target_attrs);
 361         transport_container_unregister(&i->t.host_attrs);
 362
 363         kfree(i);
 364 }
 365
 366 EXPORT_SYMBOL(iscsi_release_transport);
 367
 368 static __init int iscsi_transport_init(void)
 369 {
 370         int err = transport_class_register(&iscsi_transport_class);
 371
 372         if (err)
 373                 return err;
 374         return transport_class_register(&iscsi_host_class);
 375 }
 376
 377 static void __exit iscsi_transport_exit(void)
 378 {
 379         transport_class_unregister(&iscsi_host_class);
 380         transport_class_unregister(&iscsi_transport_class);
 381 }
 382
 383 module_init(iscsi_transport_init);
 384 module_exit(iscsi_transport_exit);
 385
 386 MODULE_AUTHOR("Mike Christie");
 387 MODULE_DESCRIPTION("iSCSI Transport Attributes");
 388 MODULE_LICENSE("GPL");